diff options
Diffstat (limited to 'drivers/dma')
116 files changed, 86163 insertions, 0 deletions
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig new file mode 100644 index 000000000..bda2cb06d --- /dev/null +++ b/drivers/dma/Kconfig @@ -0,0 +1,495 @@ +# +# DMA engine configuration +# + +menuconfig DMADEVICES + bool "DMA Engine support" + depends on HAS_DMA + help + DMA engines can do asynchronous data transfers without + involving the host CPU. Currently, this framework can be + used to offload memory copies in the network stack and + RAID operations in the MD driver. This menu only presents + DMA Device drivers supported by the configured arch, it may + be empty in some cases. + +config DMADEVICES_DEBUG + bool "DMA Engine debugging" + depends on DMADEVICES != n + help + This is an option for use by developers; most people should + say N here. This enables DMA engine core and driver debugging. + +config DMADEVICES_VDEBUG + bool "DMA Engine verbose debugging" + depends on DMADEVICES_DEBUG != n + help + This is an option for use by developers; most people should + say N here. This enables deeper (more verbose) debugging of + the DMA engine core and drivers. + + +if DMADEVICES + +comment "DMA Devices" + +config INTEL_MIC_X100_DMA + tristate "Intel MIC X100 DMA Driver" + depends on 64BIT && X86 && INTEL_MIC_BUS + select DMA_ENGINE + help + This enables DMA support for the Intel Many Integrated Core + (MIC) family of PCIe form factor coprocessor X100 devices that + run a 64 bit Linux OS. This driver will be used by both MIC + host and card drivers. + + If you are building host kernel with a MIC device or a card + kernel for a MIC device, then say M (recommended) or Y, else + say N. If unsure say N. + + More information about the Intel MIC family as well as the Linux + OS and tools for MIC to use with this driver are available from + <http://software.intel.com/en-us/mic-developer>. + +config ASYNC_TX_ENABLE_CHANNEL_SWITCH + bool + +config AMBA_PL08X + bool "ARM PrimeCell PL080 or PL081 support" + depends on ARM_AMBA + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Platform has a PL08x DMAC device + which can provide DMA engine support + +config INTEL_IOATDMA + tristate "Intel I/OAT DMA support" + depends on PCI && X86 + select DMA_ENGINE + select DMA_ENGINE_RAID + select DCA + help + Enable support for the Intel(R) I/OAT DMA engine present + in recent Intel Xeon chipsets. + + Say Y here if you have such a chipset. + + If unsure, say N. + +config INTEL_IOP_ADMA + tristate "Intel IOP ADMA support" + depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IOP13XX + select DMA_ENGINE + select ASYNC_TX_ENABLE_CHANNEL_SWITCH + help + Enable support for the Intel(R) IOP Series RAID engines. + +source "drivers/dma/dw/Kconfig" + +config AT_HDMAC + tristate "Atmel AHB DMA support" + depends on ARCH_AT91 + select DMA_ENGINE + help + Support the Atmel AHB DMA controller. + +config AT_XDMAC + tristate "Atmel XDMA support" + depends on ARCH_AT91 + select DMA_ENGINE + help + Support the Atmel XDMA controller. + +config FSL_DMA + tristate "Freescale Elo series DMA support" + depends on FSL_SOC + select DMA_ENGINE + select ASYNC_TX_ENABLE_CHANNEL_SWITCH + ---help--- + Enable support for the Freescale Elo series DMA controllers. + The Elo is the DMA controller on some mpc82xx and mpc83xx parts, the + EloPlus is on mpc85xx and mpc86xx and Pxxx parts, and the Elo3 is on + some Txxx and Bxxx parts. + +config FSL_RAID + tristate "Freescale RAID engine Support" + depends on FSL_SOC && !ASYNC_TX_ENABLE_CHANNEL_SWITCH + select DMA_ENGINE + select DMA_ENGINE_RAID + ---help--- + Enable support for Freescale RAID Engine. RAID Engine is + available on some QorIQ SoCs (like P5020/P5040). It has + the capability to offload memcpy, xor and pq computation + for raid5/6. + +source "drivers/dma/hsu/Kconfig" + +config MPC512X_DMA + tristate "Freescale MPC512x built-in DMA engine support" + depends on PPC_MPC512x || PPC_MPC831x + select DMA_ENGINE + ---help--- + Enable support for the Freescale MPC512x built-in DMA engine. + +source "drivers/dma/bestcomm/Kconfig" + +config MV_XOR + bool "Marvell XOR engine support" + depends on PLAT_ORION + select DMA_ENGINE + select DMA_ENGINE_RAID + select ASYNC_TX_ENABLE_CHANNEL_SWITCH + ---help--- + Enable support for the Marvell XOR engine. + +config MX3_IPU + bool "MX3x Image Processing Unit support" + depends on ARCH_MXC + select DMA_ENGINE + default y + help + If you plan to use the Image Processing unit in the i.MX3x, say + Y here. If unsure, select Y. + +config MX3_IPU_IRQS + int "Number of dynamically mapped interrupts for IPU" + depends on MX3_IPU + range 2 137 + default 4 + help + Out of 137 interrupt sources on i.MX31 IPU only very few are used. + To avoid bloating the irq_desc[] array we allocate a sufficient + number of IRQ slots and map them dynamically to specific sources. + +config TXX9_DMAC + tristate "Toshiba TXx9 SoC DMA support" + depends on MACH_TX49XX || MACH_TX39XX + select DMA_ENGINE + help + Support the TXx9 SoC internal DMA controller. This can be + integrated in chips such as the Toshiba TX4927/38/39. + +config TEGRA20_APB_DMA + bool "NVIDIA Tegra20 APB DMA support" + depends on ARCH_TEGRA + select DMA_ENGINE + help + Support for the NVIDIA Tegra20 APB DMA controller driver. The + DMA controller is having multiple DMA channel which can be + configured for different peripherals like audio, UART, SPI, + I2C etc which is in APB bus. + This DMA controller transfers data from memory to peripheral fifo + or vice versa. It does not support memory to memory data transfer. + +config S3C24XX_DMAC + tristate "Samsung S3C24XX DMA support" + depends on ARCH_S3C24XX + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support for the Samsung S3C24XX DMA controller driver. The + DMA controller is having multiple DMA channels which can be + configured for different peripherals like audio, UART, SPI. + The DMA controller can transfer data from memory to peripheral, + periphal to memory, periphal to periphal and memory to memory. + +source "drivers/dma/sh/Kconfig" + +config COH901318 + bool "ST-Ericsson COH901318 DMA support" + select DMA_ENGINE + depends on ARCH_U300 + help + Enable support for ST-Ericsson COH 901 318 DMA. + +config STE_DMA40 + bool "ST-Ericsson DMA40 support" + depends on ARCH_U8500 + select DMA_ENGINE + help + Support for ST-Ericsson DMA40 controller + +config AMCC_PPC440SPE_ADMA + tristate "AMCC PPC440SPe ADMA support" + depends on 440SPe || 440SP + select DMA_ENGINE + select DMA_ENGINE_RAID + select ARCH_HAS_ASYNC_TX_FIND_CHANNEL + select ASYNC_TX_ENABLE_CHANNEL_SWITCH + help + Enable support for the AMCC PPC440SPe RAID engines. + +config TIMB_DMA + tristate "Timberdale FPGA DMA support" + depends on MFD_TIMBERDALE + select DMA_ENGINE + help + Enable support for the Timberdale FPGA DMA engine. + +config SIRF_DMA + tristate "CSR SiRFprimaII/SiRFmarco DMA support" + depends on ARCH_SIRF + select DMA_ENGINE + help + Enable support for the CSR SiRFprimaII DMA engine. + +config TI_EDMA + bool "TI EDMA support" + depends on ARCH_DAVINCI || ARCH_OMAP || ARCH_KEYSTONE + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + select TI_PRIV_EDMA + default n + help + Enable support for the TI EDMA controller. This DMA + engine is found on TI DaVinci and AM33xx parts. + +config ARCH_HAS_ASYNC_TX_FIND_CHANNEL + bool + +config PL330_DMA + tristate "DMA API Driver for PL330" + select DMA_ENGINE + depends on ARM_AMBA + help + Select if your platform has one or more PL330 DMACs. + You need to provide platform specific settings via + platform_data for a dma-pl330 device. + +config PCH_DMA + tristate "Intel EG20T PCH / LAPIS Semicon IOH(ML7213/ML7223/ML7831) DMA" + depends on PCI && (X86_32 || COMPILE_TEST) + select DMA_ENGINE + help + Enable support for Intel EG20T PCH DMA engine. + + This driver also can be used for LAPIS Semiconductor IOH(Input/ + Output Hub), ML7213, ML7223 and ML7831. + ML7213 IOH is for IVI(In-Vehicle Infotainment) use, ML7223 IOH is + for MP(Media Phone) use and ML7831 IOH is for general purpose use. + ML7213/ML7223/ML7831 is companion chip for Intel Atom E6xx series. + ML7213/ML7223/ML7831 is completely compatible for Intel EG20T PCH. + +config IMX_SDMA + tristate "i.MX SDMA support" + depends on ARCH_MXC + select DMA_ENGINE + help + Support the i.MX SDMA engine. This engine is integrated into + Freescale i.MX25/31/35/51/53/6 chips. + +config IMX_DMA + tristate "i.MX DMA support" + depends on ARCH_MXC + select DMA_ENGINE + help + Support the i.MX DMA engine. This engine is integrated into + Freescale i.MX1/21/27 chips. + +config MXS_DMA + bool "MXS DMA support" + depends on SOC_IMX23 || SOC_IMX28 || SOC_IMX6Q + select STMP_DEVICE + select DMA_ENGINE + help + Support the MXS DMA engine. This engine including APBH-DMA + and APBX-DMA is integrated into Freescale i.MX23/28/MX6Q/MX6DL chips. + +config EP93XX_DMA + bool "Cirrus Logic EP93xx DMA support" + depends on ARCH_EP93XX + select DMA_ENGINE + help + Enable support for the Cirrus Logic EP93xx M2P/M2M DMA controller. + +config DMA_SA11X0 + tristate "SA-11x0 DMA support" + depends on ARCH_SA1100 + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support the DMA engine found on Intel StrongARM SA-1100 and + SA-1110 SoCs. This DMA engine can only be used with on-chip + devices. + +config MMP_TDMA + bool "MMP Two-Channel DMA support" + depends on ARCH_MMP + select DMA_ENGINE + select MMP_SRAM + help + Support the MMP Two-Channel DMA engine. + This engine used for MMP Audio DMA and pxa910 SQU. + It needs sram driver under mach-mmp. + + Say Y here if you enabled MMP ADMA, otherwise say N. + +config DMA_OMAP + tristate "OMAP DMA support" + depends on ARCH_OMAP + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + +config DMA_BCM2835 + tristate "BCM2835 DMA engine support" + depends on ARCH_BCM2835 + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + +config TI_CPPI41 + tristate "AM33xx CPPI41 DMA support" + depends on ARCH_OMAP + select DMA_ENGINE + help + The Communications Port Programming Interface (CPPI) 4.1 DMA engine + is currently used by the USB driver on AM335x platforms. + +config MMP_PDMA + bool "MMP PDMA support" + depends on (ARCH_MMP || ARCH_PXA) + select DMA_ENGINE + help + Support the MMP PDMA engine for PXA and MMP platform. + +config DMA_JZ4740 + tristate "JZ4740 DMA support" + depends on MACH_JZ4740 + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + +config DMA_JZ4780 + tristate "JZ4780 DMA support" + depends on MACH_JZ4780 + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + This selects support for the DMA controller in Ingenic JZ4780 SoCs. + If you have a board based on such a SoC and wish to use DMA for + devices which can use the DMA controller, say Y or M here. + +config K3_DMA + tristate "Hisilicon K3 DMA support" + depends on ARCH_HI3xxx + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support the DMA engine for Hisilicon K3 platform + devices. + +config MOXART_DMA + tristate "MOXART DMA support" + depends on ARCH_MOXART + select DMA_ENGINE + select DMA_OF + select DMA_VIRTUAL_CHANNELS + help + Enable support for the MOXA ART SoC DMA controller. + +config FSL_EDMA + tristate "Freescale eDMA engine support" + depends on OF + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support the Freescale eDMA engine with programmable channel + multiplexing capability for DMA request sources(slot). + This module can be found on Freescale Vybrid and LS-1 SoCs. + +config XILINX_VDMA + tristate "Xilinx AXI VDMA Engine" + depends on (ARCH_ZYNQ || MICROBLAZE) + select DMA_ENGINE + help + Enable support for Xilinx AXI VDMA Soft IP. + + This engine provides high-bandwidth direct memory access + between memory and AXI4-Stream video type target + peripherals including peripherals which support AXI4- + Stream Video Protocol. It has two stream interfaces/ + channels, Memory Mapped to Stream (MM2S) and Stream to + Memory Mapped (S2MM) for the data transfers. + +config DMA_SUN6I + tristate "Allwinner A31 SoCs DMA support" + depends on MACH_SUN6I || MACH_SUN8I || COMPILE_TEST + depends on RESET_CONTROLLER + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support for the DMA engine first found in Allwinner A31 SoCs. + +config NBPFAXI_DMA + tristate "Renesas Type-AXI NBPF DMA support" + select DMA_ENGINE + depends on ARM || COMPILE_TEST + help + Support for "Type-AXI" NBPF DMA IPs from Renesas + +config IMG_MDC_DMA + tristate "IMG MDC support" + depends on MIPS || COMPILE_TEST + depends on MFD_SYSCON + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Enable support for the IMG multi-threaded DMA controller (MDC). + +config XGENE_DMA + tristate "APM X-Gene DMA support" + depends on ARCH_XGENE || COMPILE_TEST + select DMA_ENGINE + select DMA_ENGINE_RAID + select ASYNC_TX_ENABLE_CHANNEL_SWITCH + help + Enable support for the APM X-Gene SoC DMA engine. + +config DMA_ENGINE + bool + +config DMA_VIRTUAL_CHANNELS + tristate + +config DMA_ACPI + def_bool y + depends on ACPI + +config DMA_OF + def_bool y + depends on OF + select DMA_ENGINE + +comment "DMA Clients" + depends on DMA_ENGINE + +config ASYNC_TX_DMA + bool "Async_tx: Offload support for the async_tx api" + depends on DMA_ENGINE + help + This allows the async_tx api to take advantage of offload engines for + memcpy, memset, xor, and raid6 p+q operations. If your platform has + a dma engine that can perform raid operations and you have enabled + MD_RAID456 say Y. + + If unsure, say N. + +config DMATEST + tristate "DMA Test client" + depends on DMA_ENGINE + help + Simple DMA test client. Say N unless you're debugging a + DMA Device driver. + +config DMA_ENGINE_RAID + bool + +config QCOM_BAM_DMA + tristate "QCOM BAM DMA support" + depends on ARCH_QCOM || (COMPILE_TEST && OF && ARM) + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + ---help--- + Enable support for the QCOM BAM DMA controller. This controller + provides DMA capabilities for a variety of on-chip devices. + +endif diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile new file mode 100644 index 000000000..69f77d5ba --- /dev/null +++ b/drivers/dma/Makefile @@ -0,0 +1,56 @@ +subdir-ccflags-$(CONFIG_DMADEVICES_DEBUG) := -DDEBUG +subdir-ccflags-$(CONFIG_DMADEVICES_VDEBUG) += -DVERBOSE_DEBUG + +obj-$(CONFIG_DMA_ENGINE) += dmaengine.o +obj-$(CONFIG_DMA_VIRTUAL_CHANNELS) += virt-dma.o +obj-$(CONFIG_DMA_ACPI) += acpi-dma.o +obj-$(CONFIG_DMA_OF) += of-dma.o + +obj-$(CONFIG_DMATEST) += dmatest.o +obj-$(CONFIG_INTEL_IOATDMA) += ioat/ +obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o +obj-$(CONFIG_FSL_DMA) += fsldma.o +obj-$(CONFIG_HSU_DMA) += hsu/ +obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o +obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/ +obj-$(CONFIG_MV_XOR) += mv_xor.o +obj-$(CONFIG_DW_DMAC_CORE) += dw/ +obj-$(CONFIG_AT_HDMAC) += at_hdmac.o +obj-$(CONFIG_AT_XDMAC) += at_xdmac.o +obj-$(CONFIG_MX3_IPU) += ipu/ +obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o +obj-$(CONFIG_RENESAS_DMA) += sh/ +obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o +obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += ppc4xx/ +obj-$(CONFIG_IMX_SDMA) += imx-sdma.o +obj-$(CONFIG_IMX_DMA) += imx-dma.o +obj-$(CONFIG_MXS_DMA) += mxs-dma.o +obj-$(CONFIG_TIMB_DMA) += timb_dma.o +obj-$(CONFIG_SIRF_DMA) += sirf-dma.o +obj-$(CONFIG_TI_EDMA) += edma.o +obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o +obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o +obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o +obj-$(CONFIG_PL330_DMA) += pl330.o +obj-$(CONFIG_PCH_DMA) += pch_dma.o +obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o +obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o +obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o +obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o +obj-$(CONFIG_DMA_OMAP) += omap-dma.o +obj-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o +obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o +obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o +obj-$(CONFIG_DMA_JZ4780) += dma-jz4780.o +obj-$(CONFIG_TI_CPPI41) += cppi41.o +obj-$(CONFIG_K3_DMA) += k3dma.o +obj-$(CONFIG_MOXART_DMA) += moxart-dma.o +obj-$(CONFIG_FSL_RAID) += fsl_raid.o +obj-$(CONFIG_FSL_EDMA) += fsl-edma.o +obj-$(CONFIG_QCOM_BAM_DMA) += qcom_bam_dma.o +obj-y += xilinx/ +obj-$(CONFIG_INTEL_MIC_X100_DMA) += mic_x100_dma.o +obj-$(CONFIG_NBPFAXI_DMA) += nbpfaxi.o +obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o +obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o +obj-$(CONFIG_XGENE_DMA) += xgene-dma.o diff --git a/drivers/dma/TODO b/drivers/dma/TODO new file mode 100644 index 000000000..b8045cd42 --- /dev/null +++ b/drivers/dma/TODO @@ -0,0 +1,12 @@ +TODO for slave dma + +1. Move remaining drivers to use new slave interface +2. Remove old slave pointer machansim +3. Make issue_pending to start the transaction in below drivers + - mpc512x_dma + - imx-dma + - imx-sdma + - mxs-dma.c + - intel_mid_dma +4. Check other subsystems for dma drivers and merge/move to dmaengine +5. Remove dma_slave_config's dma direction. diff --git a/drivers/dma/acpi-dma.c b/drivers/dma/acpi-dma.c new file mode 100644 index 000000000..5a635646e --- /dev/null +++ b/drivers/dma/acpi-dma.c @@ -0,0 +1,456 @@ +/* + * ACPI helpers for DMA request / controller + * + * Based on of-dma.c + * + * Copyright (C) 2013, Intel Corporation + * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com> + * Mika Westerberg <mika.westerberg@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/acpi.h> +#include <linux/acpi_dma.h> + +static LIST_HEAD(acpi_dma_list); +static DEFINE_MUTEX(acpi_dma_lock); + +/** + * acpi_dma_parse_resource_group - match device and parse resource group + * @grp: CSRT resource group + * @adev: ACPI device to match with + * @adma: struct acpi_dma of the given DMA controller + * + * In order to match a device from DSDT table to the corresponding CSRT device + * we use MMIO address and IRQ. + * + * Return: + * 1 on success, 0 when no information is available, or appropriate errno value + * on error. + */ +static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp, + struct acpi_device *adev, struct acpi_dma *adma) +{ + const struct acpi_csrt_shared_info *si; + struct list_head resource_list; + struct resource_entry *rentry; + resource_size_t mem = 0, irq = 0; + int ret; + + if (grp->shared_info_length != sizeof(struct acpi_csrt_shared_info)) + return -ENODEV; + + INIT_LIST_HEAD(&resource_list); + ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL); + if (ret <= 0) + return 0; + + list_for_each_entry(rentry, &resource_list, node) { + if (resource_type(rentry->res) == IORESOURCE_MEM) + mem = rentry->res->start; + else if (resource_type(rentry->res) == IORESOURCE_IRQ) + irq = rentry->res->start; + } + + acpi_dev_free_resource_list(&resource_list); + + /* Consider initial zero values as resource not found */ + if (mem == 0 && irq == 0) + return 0; + + si = (const struct acpi_csrt_shared_info *)&grp[1]; + + /* Match device by MMIO and IRQ */ + if (si->mmio_base_low != mem || si->gsi_interrupt != irq) + return 0; + + dev_dbg(&adev->dev, "matches with %.4s%04X (rev %u)\n", + (char *)&grp->vendor_id, grp->device_id, grp->revision); + + /* Check if the request line range is available */ + if (si->base_request_line == 0 && si->num_handshake_signals == 0) + return 0; + + adma->base_request_line = si->base_request_line; + adma->end_request_line = si->base_request_line + + si->num_handshake_signals - 1; + + dev_dbg(&adev->dev, "request line base: 0x%04x end: 0x%04x\n", + adma->base_request_line, adma->end_request_line); + + return 1; +} + +/** + * acpi_dma_parse_csrt - parse CSRT to exctract additional DMA resources + * @adev: ACPI device to match with + * @adma: struct acpi_dma of the given DMA controller + * + * CSRT or Core System Resources Table is a proprietary ACPI table + * introduced by Microsoft. This table can contain devices that are not in + * the system DSDT table. In particular DMA controllers might be described + * here. + * + * We are using this table to get the request line range of the specific DMA + * controller to be used later. + */ +static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma) +{ + struct acpi_csrt_group *grp, *end; + struct acpi_table_csrt *csrt; + acpi_status status; + int ret; + + status = acpi_get_table(ACPI_SIG_CSRT, 0, + (struct acpi_table_header **)&csrt); + if (ACPI_FAILURE(status)) { + if (status != AE_NOT_FOUND) + dev_warn(&adev->dev, "failed to get the CSRT table\n"); + return; + } + + grp = (struct acpi_csrt_group *)(csrt + 1); + end = (struct acpi_csrt_group *)((void *)csrt + csrt->header.length); + + while (grp < end) { + ret = acpi_dma_parse_resource_group(grp, adev, adma); + if (ret < 0) { + dev_warn(&adev->dev, + "error in parsing resource group\n"); + return; + } + + grp = (struct acpi_csrt_group *)((void *)grp + grp->length); + } +} + +/** + * acpi_dma_controller_register - Register a DMA controller to ACPI DMA helpers + * @dev: struct device of DMA controller + * @acpi_dma_xlate: translation function which converts a dma specifier + * into a dma_chan structure + * @data pointer to controller specific data to be used by + * translation function + * + * Allocated memory should be freed with appropriate acpi_dma_controller_free() + * call. + * + * Return: + * 0 on success or appropriate errno value on error. + */ +int acpi_dma_controller_register(struct device *dev, + struct dma_chan *(*acpi_dma_xlate) + (struct acpi_dma_spec *, struct acpi_dma *), + void *data) +{ + struct acpi_device *adev; + struct acpi_dma *adma; + + if (!dev || !acpi_dma_xlate) + return -EINVAL; + + /* Check if the device was enumerated by ACPI */ + if (!ACPI_HANDLE(dev)) + return -EINVAL; + + if (acpi_bus_get_device(ACPI_HANDLE(dev), &adev)) + return -EINVAL; + + adma = kzalloc(sizeof(*adma), GFP_KERNEL); + if (!adma) + return -ENOMEM; + + adma->dev = dev; + adma->acpi_dma_xlate = acpi_dma_xlate; + adma->data = data; + + acpi_dma_parse_csrt(adev, adma); + + /* Now queue acpi_dma controller structure in list */ + mutex_lock(&acpi_dma_lock); + list_add_tail(&adma->dma_controllers, &acpi_dma_list); + mutex_unlock(&acpi_dma_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(acpi_dma_controller_register); + +/** + * acpi_dma_controller_free - Remove a DMA controller from ACPI DMA helpers list + * @dev: struct device of DMA controller + * + * Memory allocated by acpi_dma_controller_register() is freed here. + * + * Return: + * 0 on success or appropriate errno value on error. + */ +int acpi_dma_controller_free(struct device *dev) +{ + struct acpi_dma *adma; + + if (!dev) + return -EINVAL; + + mutex_lock(&acpi_dma_lock); + + list_for_each_entry(adma, &acpi_dma_list, dma_controllers) + if (adma->dev == dev) { + list_del(&adma->dma_controllers); + mutex_unlock(&acpi_dma_lock); + kfree(adma); + return 0; + } + + mutex_unlock(&acpi_dma_lock); + return -ENODEV; +} +EXPORT_SYMBOL_GPL(acpi_dma_controller_free); + +static void devm_acpi_dma_release(struct device *dev, void *res) +{ + acpi_dma_controller_free(dev); +} + +/** + * devm_acpi_dma_controller_register - resource managed acpi_dma_controller_register() + * @dev: device that is registering this DMA controller + * @acpi_dma_xlate: translation function + * @data pointer to controller specific data + * + * Managed acpi_dma_controller_register(). DMA controller registered by this + * function are automatically freed on driver detach. See + * acpi_dma_controller_register() for more information. + * + * Return: + * 0 on success or appropriate errno value on error. + */ +int devm_acpi_dma_controller_register(struct device *dev, + struct dma_chan *(*acpi_dma_xlate) + (struct acpi_dma_spec *, struct acpi_dma *), + void *data) +{ + void *res; + int ret; + + res = devres_alloc(devm_acpi_dma_release, 0, GFP_KERNEL); + if (!res) + return -ENOMEM; + + ret = acpi_dma_controller_register(dev, acpi_dma_xlate, data); + if (ret) { + devres_free(res); + return ret; + } + devres_add(dev, res); + return 0; +} +EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_register); + +/** + * devm_acpi_dma_controller_free - resource managed acpi_dma_controller_free() + * + * Unregister a DMA controller registered with + * devm_acpi_dma_controller_register(). Normally this function will not need to + * be called and the resource management code will ensure that the resource is + * freed. + */ +void devm_acpi_dma_controller_free(struct device *dev) +{ + WARN_ON(devres_release(dev, devm_acpi_dma_release, NULL, NULL)); +} +EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_free); + +/** + * acpi_dma_update_dma_spec - prepare dma specifier to pass to translation function + * @adma: struct acpi_dma of DMA controller + * @dma_spec: dma specifier to update + * + * Accordingly to ACPI 5.0 Specification Table 6-170 "Fixed DMA Resource + * Descriptor": + * DMA Request Line bits is a platform-relative number uniquely + * identifying the request line assigned. Request line-to-Controller + * mapping is done in a controller-specific OS driver. + * That's why we can safely adjust slave_id when the appropriate controller is + * found. + * + * Return: + * 0, if no information is avaiable, -1 on mismatch, and 1 otherwise. + */ +static int acpi_dma_update_dma_spec(struct acpi_dma *adma, + struct acpi_dma_spec *dma_spec) +{ + /* Set link to the DMA controller device */ + dma_spec->dev = adma->dev; + + /* Check if the request line range is available */ + if (adma->base_request_line == 0 && adma->end_request_line == 0) + return 0; + + /* Check if slave_id falls to the range */ + if (dma_spec->slave_id < adma->base_request_line || + dma_spec->slave_id > adma->end_request_line) + return -1; + + /* + * Here we adjust slave_id. It should be a relative number to the base + * request line. + */ + dma_spec->slave_id -= adma->base_request_line; + + return 1; +} + +struct acpi_dma_parser_data { + struct acpi_dma_spec dma_spec; + size_t index; + size_t n; +}; + +/** + * acpi_dma_parse_fixed_dma - Parse FixedDMA ACPI resources to a DMA specifier + * @res: struct acpi_resource to get FixedDMA resources from + * @data: pointer to a helper struct acpi_dma_parser_data + */ +static int acpi_dma_parse_fixed_dma(struct acpi_resource *res, void *data) +{ + struct acpi_dma_parser_data *pdata = data; + + if (res->type == ACPI_RESOURCE_TYPE_FIXED_DMA) { + struct acpi_resource_fixed_dma *dma = &res->data.fixed_dma; + + if (pdata->n++ == pdata->index) { + pdata->dma_spec.chan_id = dma->channels; + pdata->dma_spec.slave_id = dma->request_lines; + } + } + + /* Tell the ACPI core to skip this resource */ + return 1; +} + +/** + * acpi_dma_request_slave_chan_by_index - Get the DMA slave channel + * @dev: struct device to get DMA request from + * @index: index of FixedDMA descriptor for @dev + * + * Return: + * Pointer to appropriate dma channel on success or an error pointer. + */ +struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev, + size_t index) +{ + struct acpi_dma_parser_data pdata; + struct acpi_dma_spec *dma_spec = &pdata.dma_spec; + struct list_head resource_list; + struct acpi_device *adev; + struct acpi_dma *adma; + struct dma_chan *chan = NULL; + int found; + + /* Check if the device was enumerated by ACPI */ + if (!dev || !ACPI_HANDLE(dev)) + return ERR_PTR(-ENODEV); + + if (acpi_bus_get_device(ACPI_HANDLE(dev), &adev)) + return ERR_PTR(-ENODEV); + + memset(&pdata, 0, sizeof(pdata)); + pdata.index = index; + + /* Initial values for the request line and channel */ + dma_spec->chan_id = -1; + dma_spec->slave_id = -1; + + INIT_LIST_HEAD(&resource_list); + acpi_dev_get_resources(adev, &resource_list, + acpi_dma_parse_fixed_dma, &pdata); + acpi_dev_free_resource_list(&resource_list); + + if (dma_spec->slave_id < 0 || dma_spec->chan_id < 0) + return ERR_PTR(-ENODEV); + + mutex_lock(&acpi_dma_lock); + + list_for_each_entry(adma, &acpi_dma_list, dma_controllers) { + /* + * We are not going to call translation function if slave_id + * doesn't fall to the request range. + */ + found = acpi_dma_update_dma_spec(adma, dma_spec); + if (found < 0) + continue; + chan = adma->acpi_dma_xlate(dma_spec, adma); + /* + * Try to get a channel only from the DMA controller that + * matches the slave_id. See acpi_dma_update_dma_spec() + * description for the details. + */ + if (found > 0 || chan) + break; + } + + mutex_unlock(&acpi_dma_lock); + return chan ? chan : ERR_PTR(-EPROBE_DEFER); +} +EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_index); + +/** + * acpi_dma_request_slave_chan_by_name - Get the DMA slave channel + * @dev: struct device to get DMA request from + * @name: represents corresponding FixedDMA descriptor for @dev + * + * In order to support both Device Tree and ACPI in a single driver we + * translate the names "tx" and "rx" here based on the most common case where + * the first FixedDMA descriptor is TX and second is RX. + * + * Return: + * Pointer to appropriate dma channel on success or an error pointer. + */ +struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev, + const char *name) +{ + size_t index; + + if (!strcmp(name, "tx")) + index = 0; + else if (!strcmp(name, "rx")) + index = 1; + else + return ERR_PTR(-ENODEV); + + return acpi_dma_request_slave_chan_by_index(dev, index); +} +EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_name); + +/** + * acpi_dma_simple_xlate - Simple ACPI DMA engine translation helper + * @dma_spec: pointer to ACPI DMA specifier + * @adma: pointer to ACPI DMA controller data + * + * A simple translation function for ACPI based devices. Passes &struct + * dma_spec to the DMA controller driver provided filter function. + * + * Return: + * Pointer to the channel if found or %NULL otherwise. + */ +struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec, + struct acpi_dma *adma) +{ + struct acpi_dma_filter_info *info = adma->data; + + if (!info || !info->filter_fn) + return NULL; + + return dma_request_channel(info->dma_cap, info->filter_fn, dma_spec); +} +EXPORT_SYMBOL_GPL(acpi_dma_simple_xlate); diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c new file mode 100644 index 000000000..49d396ec0 --- /dev/null +++ b/drivers/dma/amba-pl08x.c @@ -0,0 +1,2327 @@ +/* + * Copyright (c) 2006 ARM Ltd. + * Copyright (c) 2010 ST-Ericsson SA + * + * Author: Peter Pearse <peter.pearse@arm.com> + * Author: Linus Walleij <linus.walleij@stericsson.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is in this distribution in the file + * called COPYING. + * + * Documentation: ARM DDI 0196G == PL080 + * Documentation: ARM DDI 0218E == PL081 + * Documentation: S3C6410 User's Manual == PL080S + * + * PL080 & PL081 both have 16 sets of DMA signals that can be routed to any + * channel. + * + * The PL080 has 8 channels available for simultaneous use, and the PL081 + * has only two channels. So on these DMA controllers the number of channels + * and the number of incoming DMA signals are two totally different things. + * It is usually not possible to theoretically handle all physical signals, + * so a multiplexing scheme with possible denial of use is necessary. + * + * The PL080 has a dual bus master, PL081 has a single master. + * + * PL080S is a version modified by Samsung and used in S3C64xx SoCs. + * It differs in following aspects: + * - CH_CONFIG register at different offset, + * - separate CH_CONTROL2 register for transfer size, + * - bigger maximum transfer size, + * - 8-word aligned LLI, instead of 4-word, due to extra CCTL2 word, + * - no support for peripheral flow control. + * + * Memory to peripheral transfer may be visualized as + * Get data from memory to DMAC + * Until no data left + * On burst request from peripheral + * Destination burst from DMAC to peripheral + * Clear burst request + * Raise terminal count interrupt + * + * For peripherals with a FIFO: + * Source burst size == half the depth of the peripheral FIFO + * Destination burst size == the depth of the peripheral FIFO + * + * (Bursts are irrelevant for mem to mem transfers - there are no burst + * signals, the DMA controller will simply facilitate its AHB master.) + * + * ASSUMES default (little) endianness for DMA transfers + * + * The PL08x has two flow control settings: + * - DMAC flow control: the transfer size defines the number of transfers + * which occur for the current LLI entry, and the DMAC raises TC at the + * end of every LLI entry. Observed behaviour shows the DMAC listening + * to both the BREQ and SREQ signals (contrary to documented), + * transferring data if either is active. The LBREQ and LSREQ signals + * are ignored. + * + * - Peripheral flow control: the transfer size is ignored (and should be + * zero). The data is transferred from the current LLI entry, until + * after the final transfer signalled by LBREQ or LSREQ. The DMAC + * will then move to the next LLI entry. Unsupported by PL080S. + */ +#include <linux/amba/bus.h> +#include <linux/amba/pl08x.h> +#include <linux/debugfs.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dmaengine.h> +#include <linux/dmapool.h> +#include <linux/dma-mapping.h> +#include <linux/export.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <linux/amba/pl080.h> + +#include "dmaengine.h" +#include "virt-dma.h" + +#define DRIVER_NAME "pl08xdmac" + +#define PL80X_DMA_BUSWIDTHS \ + BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) + +static struct amba_driver pl08x_amba_driver; +struct pl08x_driver_data; + +/** + * struct vendor_data - vendor-specific config parameters for PL08x derivatives + * @channels: the number of channels available in this variant + * @dualmaster: whether this version supports dual AHB masters or not. + * @nomadik: whether the channels have Nomadik security extension bits + * that need to be checked for permission before use and some registers are + * missing + * @pl080s: whether this version is a PL080S, which has separate register and + * LLI word for transfer size. + */ +struct vendor_data { + u8 config_offset; + u8 channels; + bool dualmaster; + bool nomadik; + bool pl080s; + u32 max_transfer_size; +}; + +/** + * struct pl08x_bus_data - information of source or destination + * busses for a transfer + * @addr: current address + * @maxwidth: the maximum width of a transfer on this bus + * @buswidth: the width of this bus in bytes: 1, 2 or 4 + */ +struct pl08x_bus_data { + dma_addr_t addr; + u8 maxwidth; + u8 buswidth; +}; + +#define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth) + +/** + * struct pl08x_phy_chan - holder for the physical channels + * @id: physical index to this channel + * @lock: a lock to use when altering an instance of this struct + * @serving: the virtual channel currently being served by this physical + * channel + * @locked: channel unavailable for the system, e.g. dedicated to secure + * world + */ +struct pl08x_phy_chan { + unsigned int id; + void __iomem *base; + void __iomem *reg_config; + spinlock_t lock; + struct pl08x_dma_chan *serving; + bool locked; +}; + +/** + * struct pl08x_sg - structure containing data per sg + * @src_addr: src address of sg + * @dst_addr: dst address of sg + * @len: transfer len in bytes + * @node: node for txd's dsg_list + */ +struct pl08x_sg { + dma_addr_t src_addr; + dma_addr_t dst_addr; + size_t len; + struct list_head node; +}; + +/** + * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor + * @vd: virtual DMA descriptor + * @dsg_list: list of children sg's + * @llis_bus: DMA memory address (physical) start for the LLIs + * @llis_va: virtual memory address start for the LLIs + * @cctl: control reg values for current txd + * @ccfg: config reg values for current txd + * @done: this marks completed descriptors, which should not have their + * mux released. + * @cyclic: indicate cyclic transfers + */ +struct pl08x_txd { + struct virt_dma_desc vd; + struct list_head dsg_list; + dma_addr_t llis_bus; + u32 *llis_va; + /* Default cctl value for LLIs */ + u32 cctl; + /* + * Settings to be put into the physical channel when we + * trigger this txd. Other registers are in llis_va[0]. + */ + u32 ccfg; + bool done; + bool cyclic; +}; + +/** + * struct pl08x_dma_chan_state - holds the PL08x specific virtual channel + * states + * @PL08X_CHAN_IDLE: the channel is idle + * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport + * channel and is running a transfer on it + * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport + * channel, but the transfer is currently paused + * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport + * channel to become available (only pertains to memcpy channels) + */ +enum pl08x_dma_chan_state { + PL08X_CHAN_IDLE, + PL08X_CHAN_RUNNING, + PL08X_CHAN_PAUSED, + PL08X_CHAN_WAITING, +}; + +/** + * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel + * @vc: wrappped virtual channel + * @phychan: the physical channel utilized by this channel, if there is one + * @name: name of channel + * @cd: channel platform data + * @runtime_addr: address for RX/TX according to the runtime config + * @at: active transaction on this channel + * @lock: a lock for this channel data + * @host: a pointer to the host (internal use) + * @state: whether the channel is idle, paused, running etc + * @slave: whether this channel is a device (slave) or for memcpy + * @signal: the physical DMA request signal which this channel is using + * @mux_use: count of descriptors using this DMA request signal setting + */ +struct pl08x_dma_chan { + struct virt_dma_chan vc; + struct pl08x_phy_chan *phychan; + const char *name; + const struct pl08x_channel_data *cd; + struct dma_slave_config cfg; + struct pl08x_txd *at; + struct pl08x_driver_data *host; + enum pl08x_dma_chan_state state; + bool slave; + int signal; + unsigned mux_use; +}; + +/** + * struct pl08x_driver_data - the local state holder for the PL08x + * @slave: slave engine for this instance + * @memcpy: memcpy engine for this instance + * @base: virtual memory base (remapped) for the PL08x + * @adev: the corresponding AMBA (PrimeCell) bus entry + * @vd: vendor data for this PL08x variant + * @pd: platform data passed in from the platform/machine + * @phy_chans: array of data for the physical channels + * @pool: a pool for the LLI descriptors + * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI + * fetches + * @mem_buses: set to indicate memory transfers on AHB2. + * @lock: a spinlock for this struct + */ +struct pl08x_driver_data { + struct dma_device slave; + struct dma_device memcpy; + void __iomem *base; + struct amba_device *adev; + const struct vendor_data *vd; + struct pl08x_platform_data *pd; + struct pl08x_phy_chan *phy_chans; + struct dma_pool *pool; + u8 lli_buses; + u8 mem_buses; + u8 lli_words; +}; + +/* + * PL08X specific defines + */ + +/* The order of words in an LLI. */ +#define PL080_LLI_SRC 0 +#define PL080_LLI_DST 1 +#define PL080_LLI_LLI 2 +#define PL080_LLI_CCTL 3 +#define PL080S_LLI_CCTL2 4 + +/* Total words in an LLI. */ +#define PL080_LLI_WORDS 4 +#define PL080S_LLI_WORDS 8 + +/* + * Number of LLIs in each LLI buffer allocated for one transfer + * (maximum times we call dma_pool_alloc on this pool without freeing) + */ +#define MAX_NUM_TSFR_LLIS 512 +#define PL08X_ALIGN 8 + +static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) +{ + return container_of(chan, struct pl08x_dma_chan, vc.chan); +} + +static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) +{ + return container_of(tx, struct pl08x_txd, vd.tx); +} + +/* + * Mux handling. + * + * This gives us the DMA request input to the PL08x primecell which the + * peripheral described by the channel data will be routed to, possibly + * via a board/SoC specific external MUX. One important point to note + * here is that this does not depend on the physical channel. + */ +static int pl08x_request_mux(struct pl08x_dma_chan *plchan) +{ + const struct pl08x_platform_data *pd = plchan->host->pd; + int ret; + + if (plchan->mux_use++ == 0 && pd->get_xfer_signal) { + ret = pd->get_xfer_signal(plchan->cd); + if (ret < 0) { + plchan->mux_use = 0; + return ret; + } + + plchan->signal = ret; + } + return 0; +} + +static void pl08x_release_mux(struct pl08x_dma_chan *plchan) +{ + const struct pl08x_platform_data *pd = plchan->host->pd; + + if (plchan->signal >= 0) { + WARN_ON(plchan->mux_use == 0); + + if (--plchan->mux_use == 0 && pd->put_xfer_signal) { + pd->put_xfer_signal(plchan->cd, plchan->signal); + plchan->signal = -1; + } + } +} + +/* + * Physical channel handling + */ + +/* Whether a certain channel is busy or not */ +static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) +{ + unsigned int val; + + val = readl(ch->reg_config); + return val & PL080_CONFIG_ACTIVE; +} + +static void pl08x_write_lli(struct pl08x_driver_data *pl08x, + struct pl08x_phy_chan *phychan, const u32 *lli, u32 ccfg) +{ + if (pl08x->vd->pl080s) + dev_vdbg(&pl08x->adev->dev, + "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " + "clli=0x%08x, cctl=0x%08x, cctl2=0x%08x, ccfg=0x%08x\n", + phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST], + lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], + lli[PL080S_LLI_CCTL2], ccfg); + else + dev_vdbg(&pl08x->adev->dev, + "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " + "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", + phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST], + lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], ccfg); + + writel_relaxed(lli[PL080_LLI_SRC], phychan->base + PL080_CH_SRC_ADDR); + writel_relaxed(lli[PL080_LLI_DST], phychan->base + PL080_CH_DST_ADDR); + writel_relaxed(lli[PL080_LLI_LLI], phychan->base + PL080_CH_LLI); + writel_relaxed(lli[PL080_LLI_CCTL], phychan->base + PL080_CH_CONTROL); + + if (pl08x->vd->pl080s) + writel_relaxed(lli[PL080S_LLI_CCTL2], + phychan->base + PL080S_CH_CONTROL2); + + writel(ccfg, phychan->reg_config); +} + +/* + * Set the initial DMA register values i.e. those for the first LLI + * The next LLI pointer and the configuration interrupt bit have + * been set when the LLIs were constructed. Poke them into the hardware + * and start the transfer. + */ +static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_phy_chan *phychan = plchan->phychan; + struct virt_dma_desc *vd = vchan_next_desc(&plchan->vc); + struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); + u32 val; + + list_del(&txd->vd.node); + + plchan->at = txd; + + /* Wait for channel inactive */ + while (pl08x_phy_channel_busy(phychan)) + cpu_relax(); + + pl08x_write_lli(pl08x, phychan, &txd->llis_va[0], txd->ccfg); + + /* Enable the DMA channel */ + /* Do not access config register until channel shows as disabled */ + while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id)) + cpu_relax(); + + /* Do not access config register until channel shows as inactive */ + val = readl(phychan->reg_config); + while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) + val = readl(phychan->reg_config); + + writel(val | PL080_CONFIG_ENABLE, phychan->reg_config); +} + +/* + * Pause the channel by setting the HALT bit. + * + * For M->P transfers, pause the DMAC first and then stop the peripheral - + * the FIFO can only drain if the peripheral is still requesting data. + * (note: this can still timeout if the DMAC FIFO never drains of data.) + * + * For P->M transfers, disable the peripheral first to stop it filling + * the DMAC FIFO, and then pause the DMAC. + */ +static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) +{ + u32 val; + int timeout; + + /* Set the HALT bit and wait for the FIFO to drain */ + val = readl(ch->reg_config); + val |= PL080_CONFIG_HALT; + writel(val, ch->reg_config); + + /* Wait for channel inactive */ + for (timeout = 1000; timeout; timeout--) { + if (!pl08x_phy_channel_busy(ch)) + break; + udelay(1); + } + if (pl08x_phy_channel_busy(ch)) + pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id); +} + +static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) +{ + u32 val; + + /* Clear the HALT bit */ + val = readl(ch->reg_config); + val &= ~PL080_CONFIG_HALT; + writel(val, ch->reg_config); +} + +/* + * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and + * clears any pending interrupt status. This should not be used for + * an on-going transfer, but as a method of shutting down a channel + * (eg, when it's no longer used) or terminating a transfer. + */ +static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x, + struct pl08x_phy_chan *ch) +{ + u32 val = readl(ch->reg_config); + + val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK | + PL080_CONFIG_TC_IRQ_MASK); + + writel(val, ch->reg_config); + + writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR); + writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR); +} + +static inline u32 get_bytes_in_cctl(u32 cctl) +{ + /* The source width defines the number of bytes */ + u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; + + cctl &= PL080_CONTROL_SWIDTH_MASK; + + switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { + case PL080_WIDTH_8BIT: + break; + case PL080_WIDTH_16BIT: + bytes *= 2; + break; + case PL080_WIDTH_32BIT: + bytes *= 4; + break; + } + return bytes; +} + +static inline u32 get_bytes_in_cctl_pl080s(u32 cctl, u32 cctl1) +{ + /* The source width defines the number of bytes */ + u32 bytes = cctl1 & PL080S_CONTROL_TRANSFER_SIZE_MASK; + + cctl &= PL080_CONTROL_SWIDTH_MASK; + + switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { + case PL080_WIDTH_8BIT: + break; + case PL080_WIDTH_16BIT: + bytes *= 2; + break; + case PL080_WIDTH_32BIT: + bytes *= 4; + break; + } + return bytes; +} + +/* The channel should be paused when calling this */ +static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + const u32 *llis_va, *llis_va_limit; + struct pl08x_phy_chan *ch; + dma_addr_t llis_bus; + struct pl08x_txd *txd; + u32 llis_max_words; + size_t bytes; + u32 clli; + + ch = plchan->phychan; + txd = plchan->at; + + if (!ch || !txd) + return 0; + + /* + * Follow the LLIs to get the number of remaining + * bytes in the currently active transaction. + */ + clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; + + /* First get the remaining bytes in the active transfer */ + if (pl08x->vd->pl080s) + bytes = get_bytes_in_cctl_pl080s( + readl(ch->base + PL080_CH_CONTROL), + readl(ch->base + PL080S_CH_CONTROL2)); + else + bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); + + if (!clli) + return bytes; + + llis_va = txd->llis_va; + llis_bus = txd->llis_bus; + + llis_max_words = pl08x->lli_words * MAX_NUM_TSFR_LLIS; + BUG_ON(clli < llis_bus || clli >= llis_bus + + sizeof(u32) * llis_max_words); + + /* + * Locate the next LLI - as this is an array, + * it's simple maths to find. + */ + llis_va += (clli - llis_bus) / sizeof(u32); + + llis_va_limit = llis_va + llis_max_words; + + for (; llis_va < llis_va_limit; llis_va += pl08x->lli_words) { + if (pl08x->vd->pl080s) + bytes += get_bytes_in_cctl_pl080s( + llis_va[PL080_LLI_CCTL], + llis_va[PL080S_LLI_CCTL2]); + else + bytes += get_bytes_in_cctl(llis_va[PL080_LLI_CCTL]); + + /* + * A LLI pointer going backward terminates the LLI list + */ + if (llis_va[PL080_LLI_LLI] <= clli) + break; + } + + return bytes; +} + +/* + * Allocate a physical channel for a virtual channel + * + * Try to locate a physical channel to be used for this transfer. If all + * are taken return NULL and the requester will have to cope by using + * some fallback PIO mode or retrying later. + */ +static struct pl08x_phy_chan * +pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, + struct pl08x_dma_chan *virt_chan) +{ + struct pl08x_phy_chan *ch = NULL; + unsigned long flags; + int i; + + for (i = 0; i < pl08x->vd->channels; i++) { + ch = &pl08x->phy_chans[i]; + + spin_lock_irqsave(&ch->lock, flags); + + if (!ch->locked && !ch->serving) { + ch->serving = virt_chan; + spin_unlock_irqrestore(&ch->lock, flags); + break; + } + + spin_unlock_irqrestore(&ch->lock, flags); + } + + if (i == pl08x->vd->channels) { + /* No physical channel available, cope with it */ + return NULL; + } + + return ch; +} + +/* Mark the physical channel as free. Note, this write is atomic. */ +static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, + struct pl08x_phy_chan *ch) +{ + ch->serving = NULL; +} + +/* + * Try to allocate a physical channel. When successful, assign it to + * this virtual channel, and initiate the next descriptor. The + * virtual channel lock must be held at this point. + */ +static void pl08x_phy_alloc_and_start(struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_phy_chan *ch; + + ch = pl08x_get_phy_channel(pl08x, plchan); + if (!ch) { + dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); + plchan->state = PL08X_CHAN_WAITING; + return; + } + + dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n", + ch->id, plchan->name); + + plchan->phychan = ch; + plchan->state = PL08X_CHAN_RUNNING; + pl08x_start_next_txd(plchan); +} + +static void pl08x_phy_reassign_start(struct pl08x_phy_chan *ch, + struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + + dev_dbg(&pl08x->adev->dev, "reassigned physical channel %d for xfer on %s\n", + ch->id, plchan->name); + + /* + * We do this without taking the lock; we're really only concerned + * about whether this pointer is NULL or not, and we're guaranteed + * that this will only be called when it _already_ is non-NULL. + */ + ch->serving = plchan; + plchan->phychan = ch; + plchan->state = PL08X_CHAN_RUNNING; + pl08x_start_next_txd(plchan); +} + +/* + * Free a physical DMA channel, potentially reallocating it to another + * virtual channel if we have any pending. + */ +static void pl08x_phy_free(struct pl08x_dma_chan *plchan) +{ + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_dma_chan *p, *next; + + retry: + next = NULL; + + /* Find a waiting virtual channel for the next transfer. */ + list_for_each_entry(p, &pl08x->memcpy.channels, vc.chan.device_node) + if (p->state == PL08X_CHAN_WAITING) { + next = p; + break; + } + + if (!next) { + list_for_each_entry(p, &pl08x->slave.channels, vc.chan.device_node) + if (p->state == PL08X_CHAN_WAITING) { + next = p; + break; + } + } + + /* Ensure that the physical channel is stopped */ + pl08x_terminate_phy_chan(pl08x, plchan->phychan); + + if (next) { + bool success; + + /* + * Eww. We know this isn't going to deadlock + * but lockdep probably doesn't. + */ + spin_lock(&next->vc.lock); + /* Re-check the state now that we have the lock */ + success = next->state == PL08X_CHAN_WAITING; + if (success) + pl08x_phy_reassign_start(plchan->phychan, next); + spin_unlock(&next->vc.lock); + + /* If the state changed, try to find another channel */ + if (!success) + goto retry; + } else { + /* No more jobs, so free up the physical channel */ + pl08x_put_phy_channel(pl08x, plchan->phychan); + } + + plchan->phychan = NULL; + plchan->state = PL08X_CHAN_IDLE; +} + +/* + * LLI handling + */ + +static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) +{ + switch (coded) { + case PL080_WIDTH_8BIT: + return 1; + case PL080_WIDTH_16BIT: + return 2; + case PL080_WIDTH_32BIT: + return 4; + default: + break; + } + BUG(); + return 0; +} + +static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, + size_t tsize) +{ + u32 retbits = cctl; + + /* Remove all src, dst and transfer size bits */ + retbits &= ~PL080_CONTROL_DWIDTH_MASK; + retbits &= ~PL080_CONTROL_SWIDTH_MASK; + retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; + + /* Then set the bits according to the parameters */ + switch (srcwidth) { + case 1: + retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; + break; + case 2: + retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; + break; + case 4: + retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; + break; + default: + BUG(); + break; + } + + switch (dstwidth) { + case 1: + retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; + break; + case 2: + retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; + break; + case 4: + retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; + break; + default: + BUG(); + break; + } + + tsize &= PL080_CONTROL_TRANSFER_SIZE_MASK; + retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; + return retbits; +} + +struct pl08x_lli_build_data { + struct pl08x_txd *txd; + struct pl08x_bus_data srcbus; + struct pl08x_bus_data dstbus; + size_t remainder; + u32 lli_bus; +}; + +/* + * Autoselect a master bus to use for the transfer. Slave will be the chosen as + * victim in case src & dest are not similarly aligned. i.e. If after aligning + * masters address with width requirements of transfer (by sending few byte by + * byte data), slave is still not aligned, then its width will be reduced to + * BYTE. + * - prefers the destination bus if both available + * - prefers bus with fixed address (i.e. peripheral) + */ +static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd, + struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl) +{ + if (!(cctl & PL080_CONTROL_DST_INCR)) { + *mbus = &bd->dstbus; + *sbus = &bd->srcbus; + } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { + *mbus = &bd->srcbus; + *sbus = &bd->dstbus; + } else { + if (bd->dstbus.buswidth >= bd->srcbus.buswidth) { + *mbus = &bd->dstbus; + *sbus = &bd->srcbus; + } else { + *mbus = &bd->srcbus; + *sbus = &bd->dstbus; + } + } +} + +/* + * Fills in one LLI for a certain transfer descriptor and advance the counter + */ +static void pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x, + struct pl08x_lli_build_data *bd, + int num_llis, int len, u32 cctl, u32 cctl2) +{ + u32 offset = num_llis * pl08x->lli_words; + u32 *llis_va = bd->txd->llis_va + offset; + dma_addr_t llis_bus = bd->txd->llis_bus; + + BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); + + /* Advance the offset to next LLI. */ + offset += pl08x->lli_words; + + llis_va[PL080_LLI_SRC] = bd->srcbus.addr; + llis_va[PL080_LLI_DST] = bd->dstbus.addr; + llis_va[PL080_LLI_LLI] = (llis_bus + sizeof(u32) * offset); + llis_va[PL080_LLI_LLI] |= bd->lli_bus; + llis_va[PL080_LLI_CCTL] = cctl; + if (pl08x->vd->pl080s) + llis_va[PL080S_LLI_CCTL2] = cctl2; + + if (cctl & PL080_CONTROL_SRC_INCR) + bd->srcbus.addr += len; + if (cctl & PL080_CONTROL_DST_INCR) + bd->dstbus.addr += len; + + BUG_ON(bd->remainder < len); + + bd->remainder -= len; +} + +static inline void prep_byte_width_lli(struct pl08x_driver_data *pl08x, + struct pl08x_lli_build_data *bd, u32 *cctl, u32 len, + int num_llis, size_t *total_bytes) +{ + *cctl = pl08x_cctl_bits(*cctl, 1, 1, len); + pl08x_fill_lli_for_desc(pl08x, bd, num_llis, len, *cctl, len); + (*total_bytes) += len; +} + +#ifdef VERBOSE_DEBUG +static void pl08x_dump_lli(struct pl08x_driver_data *pl08x, + const u32 *llis_va, int num_llis) +{ + int i; + + if (pl08x->vd->pl080s) { + dev_vdbg(&pl08x->adev->dev, + "%-3s %-9s %-10s %-10s %-10s %-10s %s\n", + "lli", "", "csrc", "cdst", "clli", "cctl", "cctl2"); + for (i = 0; i < num_llis; i++) { + dev_vdbg(&pl08x->adev->dev, + "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n", + i, llis_va, llis_va[PL080_LLI_SRC], + llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI], + llis_va[PL080_LLI_CCTL], + llis_va[PL080S_LLI_CCTL2]); + llis_va += pl08x->lli_words; + } + } else { + dev_vdbg(&pl08x->adev->dev, + "%-3s %-9s %-10s %-10s %-10s %s\n", + "lli", "", "csrc", "cdst", "clli", "cctl"); + for (i = 0; i < num_llis; i++) { + dev_vdbg(&pl08x->adev->dev, + "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n", + i, llis_va, llis_va[PL080_LLI_SRC], + llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI], + llis_va[PL080_LLI_CCTL]); + llis_va += pl08x->lli_words; + } + } +} +#else +static inline void pl08x_dump_lli(struct pl08x_driver_data *pl08x, + const u32 *llis_va, int num_llis) {} +#endif + +/* + * This fills in the table of LLIs for the transfer descriptor + * Note that we assume we never have to change the burst sizes + * Return 0 for error + */ +static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, + struct pl08x_txd *txd) +{ + struct pl08x_bus_data *mbus, *sbus; + struct pl08x_lli_build_data bd; + int num_llis = 0; + u32 cctl, early_bytes = 0; + size_t max_bytes_per_lli, total_bytes; + u32 *llis_va, *last_lli; + struct pl08x_sg *dsg; + + txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus); + if (!txd->llis_va) { + dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); + return 0; + } + + bd.txd = txd; + bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; + cctl = txd->cctl; + + /* Find maximum width of the source bus */ + bd.srcbus.maxwidth = + pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> + PL080_CONTROL_SWIDTH_SHIFT); + + /* Find maximum width of the destination bus */ + bd.dstbus.maxwidth = + pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> + PL080_CONTROL_DWIDTH_SHIFT); + + list_for_each_entry(dsg, &txd->dsg_list, node) { + total_bytes = 0; + cctl = txd->cctl; + + bd.srcbus.addr = dsg->src_addr; + bd.dstbus.addr = dsg->dst_addr; + bd.remainder = dsg->len; + bd.srcbus.buswidth = bd.srcbus.maxwidth; + bd.dstbus.buswidth = bd.dstbus.maxwidth; + + pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl); + + dev_vdbg(&pl08x->adev->dev, + "src=0x%08llx%s/%u dst=0x%08llx%s/%u len=%zu\n", + (u64)bd.srcbus.addr, + cctl & PL080_CONTROL_SRC_INCR ? "+" : "", + bd.srcbus.buswidth, + (u64)bd.dstbus.addr, + cctl & PL080_CONTROL_DST_INCR ? "+" : "", + bd.dstbus.buswidth, + bd.remainder); + dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n", + mbus == &bd.srcbus ? "src" : "dst", + sbus == &bd.srcbus ? "src" : "dst"); + + /* + * Zero length is only allowed if all these requirements are + * met: + * - flow controller is peripheral. + * - src.addr is aligned to src.width + * - dst.addr is aligned to dst.width + * + * sg_len == 1 should be true, as there can be two cases here: + * + * - Memory addresses are contiguous and are not scattered. + * Here, Only one sg will be passed by user driver, with + * memory address and zero length. We pass this to controller + * and after the transfer it will receive the last burst + * request from peripheral and so transfer finishes. + * + * - Memory addresses are scattered and are not contiguous. + * Here, Obviously as DMA controller doesn't know when a lli's + * transfer gets over, it can't load next lli. So in this + * case, there has to be an assumption that only one lli is + * supported. Thus, we can't have scattered addresses. + */ + if (!bd.remainder) { + u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >> + PL080_CONFIG_FLOW_CONTROL_SHIFT; + if (!((fc >= PL080_FLOW_SRC2DST_DST) && + (fc <= PL080_FLOW_SRC2DST_SRC))) { + dev_err(&pl08x->adev->dev, "%s sg len can't be zero", + __func__); + return 0; + } + + if (!IS_BUS_ALIGNED(&bd.srcbus) || + !IS_BUS_ALIGNED(&bd.dstbus)) { + dev_err(&pl08x->adev->dev, + "%s src & dst address must be aligned to src" + " & dst width if peripheral is flow controller", + __func__); + return 0; + } + + cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, + bd.dstbus.buswidth, 0); + pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++, + 0, cctl, 0); + break; + } + + /* + * Send byte by byte for following cases + * - Less than a bus width available + * - until master bus is aligned + */ + if (bd.remainder < mbus->buswidth) + early_bytes = bd.remainder; + else if (!IS_BUS_ALIGNED(mbus)) { + early_bytes = mbus->buswidth - + (mbus->addr & (mbus->buswidth - 1)); + if ((bd.remainder - early_bytes) < mbus->buswidth) + early_bytes = bd.remainder; + } + + if (early_bytes) { + dev_vdbg(&pl08x->adev->dev, + "%s byte width LLIs (remain 0x%08zx)\n", + __func__, bd.remainder); + prep_byte_width_lli(pl08x, &bd, &cctl, early_bytes, + num_llis++, &total_bytes); + } + + if (bd.remainder) { + /* + * Master now aligned + * - if slave is not then we must set its width down + */ + if (!IS_BUS_ALIGNED(sbus)) { + dev_dbg(&pl08x->adev->dev, + "%s set down bus width to one byte\n", + __func__); + + sbus->buswidth = 1; + } + + /* + * Bytes transferred = tsize * src width, not + * MIN(buswidths) + */ + max_bytes_per_lli = bd.srcbus.buswidth * + pl08x->vd->max_transfer_size; + dev_vdbg(&pl08x->adev->dev, + "%s max bytes per lli = %zu\n", + __func__, max_bytes_per_lli); + + /* + * Make largest possible LLIs until less than one bus + * width left + */ + while (bd.remainder > (mbus->buswidth - 1)) { + size_t lli_len, tsize, width; + + /* + * If enough left try to send max possible, + * otherwise try to send the remainder + */ + lli_len = min(bd.remainder, max_bytes_per_lli); + + /* + * Check against maximum bus alignment: + * Calculate actual transfer size in relation to + * bus width an get a maximum remainder of the + * highest bus width - 1 + */ + width = max(mbus->buswidth, sbus->buswidth); + lli_len = (lli_len / width) * width; + tsize = lli_len / bd.srcbus.buswidth; + + dev_vdbg(&pl08x->adev->dev, + "%s fill lli with single lli chunk of " + "size 0x%08zx (remainder 0x%08zx)\n", + __func__, lli_len, bd.remainder); + + cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, + bd.dstbus.buswidth, tsize); + pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++, + lli_len, cctl, tsize); + total_bytes += lli_len; + } + + /* + * Send any odd bytes + */ + if (bd.remainder) { + dev_vdbg(&pl08x->adev->dev, + "%s align with boundary, send odd bytes (remain %zu)\n", + __func__, bd.remainder); + prep_byte_width_lli(pl08x, &bd, &cctl, + bd.remainder, num_llis++, &total_bytes); + } + } + + if (total_bytes != dsg->len) { + dev_err(&pl08x->adev->dev, + "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", + __func__, total_bytes, dsg->len); + return 0; + } + + if (num_llis >= MAX_NUM_TSFR_LLIS) { + dev_err(&pl08x->adev->dev, + "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", + __func__, MAX_NUM_TSFR_LLIS); + return 0; + } + } + + llis_va = txd->llis_va; + last_lli = llis_va + (num_llis - 1) * pl08x->lli_words; + + if (txd->cyclic) { + /* Link back to the first LLI. */ + last_lli[PL080_LLI_LLI] = txd->llis_bus | bd.lli_bus; + } else { + /* The final LLI terminates the LLI. */ + last_lli[PL080_LLI_LLI] = 0; + /* The final LLI element shall also fire an interrupt. */ + last_lli[PL080_LLI_CCTL] |= PL080_CONTROL_TC_IRQ_EN; + } + + pl08x_dump_lli(pl08x, llis_va, num_llis); + + return num_llis; +} + +static void pl08x_free_txd(struct pl08x_driver_data *pl08x, + struct pl08x_txd *txd) +{ + struct pl08x_sg *dsg, *_dsg; + + if (txd->llis_va) + dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); + + list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { + list_del(&dsg->node); + kfree(dsg); + } + + kfree(txd); +} + +static void pl08x_desc_free(struct virt_dma_desc *vd) +{ + struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); + struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan); + + dma_descriptor_unmap(&vd->tx); + if (!txd->done) + pl08x_release_mux(plchan); + + pl08x_free_txd(plchan->host, txd); +} + +static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, + struct pl08x_dma_chan *plchan) +{ + LIST_HEAD(head); + + vchan_get_all_descriptors(&plchan->vc, &head); + vchan_dma_desc_free_list(&plchan->vc, &head); +} + +/* + * The DMA ENGINE API + */ +static void pl08x_free_chan_resources(struct dma_chan *chan) +{ + /* Ensure all queued descriptors are freed */ + vchan_free_chan_resources(to_virt_chan(chan)); +} + +static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( + struct dma_chan *chan, unsigned long flags) +{ + struct dma_async_tx_descriptor *retval = NULL; + + return retval; +} + +/* + * Code accessing dma_async_is_complete() in a tight loop may give problems. + * If slaves are relying on interrupts to signal completion this function + * must not be called with interrupts disabled. + */ +static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct virt_dma_desc *vd; + unsigned long flags; + enum dma_status ret; + size_t bytes = 0; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + /* + * There's no point calculating the residue if there's + * no txstate to store the value. + */ + if (!txstate) { + if (plchan->state == PL08X_CHAN_PAUSED) + ret = DMA_PAUSED; + return ret; + } + + spin_lock_irqsave(&plchan->vc.lock, flags); + ret = dma_cookie_status(chan, cookie, txstate); + if (ret != DMA_COMPLETE) { + vd = vchan_find_desc(&plchan->vc, cookie); + if (vd) { + /* On the issued list, so hasn't been processed yet */ + struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); + struct pl08x_sg *dsg; + + list_for_each_entry(dsg, &txd->dsg_list, node) + bytes += dsg->len; + } else { + bytes = pl08x_getbytes_chan(plchan); + } + } + spin_unlock_irqrestore(&plchan->vc.lock, flags); + + /* + * This cookie not complete yet + * Get number of bytes left in the active transactions and queue + */ + dma_set_residue(txstate, bytes); + + if (plchan->state == PL08X_CHAN_PAUSED && ret == DMA_IN_PROGRESS) + ret = DMA_PAUSED; + + /* Whether waiting or running, we're in progress */ + return ret; +} + +/* PrimeCell DMA extension */ +struct burst_table { + u32 burstwords; + u32 reg; +}; + +static const struct burst_table burst_sizes[] = { + { + .burstwords = 256, + .reg = PL080_BSIZE_256, + }, + { + .burstwords = 128, + .reg = PL080_BSIZE_128, + }, + { + .burstwords = 64, + .reg = PL080_BSIZE_64, + }, + { + .burstwords = 32, + .reg = PL080_BSIZE_32, + }, + { + .burstwords = 16, + .reg = PL080_BSIZE_16, + }, + { + .burstwords = 8, + .reg = PL080_BSIZE_8, + }, + { + .burstwords = 4, + .reg = PL080_BSIZE_4, + }, + { + .burstwords = 0, + .reg = PL080_BSIZE_1, + }, +}; + +/* + * Given the source and destination available bus masks, select which + * will be routed to each port. We try to have source and destination + * on separate ports, but always respect the allowable settings. + */ +static u32 pl08x_select_bus(u8 src, u8 dst) +{ + u32 cctl = 0; + + if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1))) + cctl |= PL080_CONTROL_DST_AHB2; + if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2))) + cctl |= PL080_CONTROL_SRC_AHB2; + + return cctl; +} + +static u32 pl08x_cctl(u32 cctl) +{ + cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 | + PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | + PL080_CONTROL_PROT_MASK); + + /* Access the cell in privileged mode, non-bufferable, non-cacheable */ + return cctl | PL080_CONTROL_PROT_SYS; +} + +static u32 pl08x_width(enum dma_slave_buswidth width) +{ + switch (width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + return PL080_WIDTH_8BIT; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + return PL080_WIDTH_16BIT; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + return PL080_WIDTH_32BIT; + default: + return ~0; + } +} + +static u32 pl08x_burst(u32 maxburst) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) + if (burst_sizes[i].burstwords <= maxburst) + break; + + return burst_sizes[i].reg; +} + +static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan, + enum dma_slave_buswidth addr_width, u32 maxburst) +{ + u32 width, burst, cctl = 0; + + width = pl08x_width(addr_width); + if (width == ~0) + return ~0; + + cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; + cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; + + /* + * If this channel will only request single transfers, set this + * down to ONE element. Also select one element if no maxburst + * is specified. + */ + if (plchan->cd->single) + maxburst = 1; + + burst = pl08x_burst(maxburst); + cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; + cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; + + return pl08x_cctl(cctl); +} + +/* + * Slave transactions callback to the slave device to allow + * synchronization of slave DMA signals with the DMAC enable + */ +static void pl08x_issue_pending(struct dma_chan *chan) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&plchan->vc.lock, flags); + if (vchan_issue_pending(&plchan->vc)) { + if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING) + pl08x_phy_alloc_and_start(plchan); + } + spin_unlock_irqrestore(&plchan->vc.lock, flags); +} + +static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan) +{ + struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); + + if (txd) { + INIT_LIST_HEAD(&txd->dsg_list); + + /* Always enable error and terminal interrupts */ + txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | + PL080_CONFIG_TC_IRQ_MASK; + } + return txd; +} + +/* + * Initialize a descriptor to be used by memcpy submit + */ +static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_txd *txd; + struct pl08x_sg *dsg; + int ret; + + txd = pl08x_get_txd(plchan); + if (!txd) { + dev_err(&pl08x->adev->dev, + "%s no memory for descriptor\n", __func__); + return NULL; + } + + dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); + if (!dsg) { + pl08x_free_txd(pl08x, txd); + dev_err(&pl08x->adev->dev, "%s no memory for pl080 sg\n", + __func__); + return NULL; + } + list_add_tail(&dsg->node, &txd->dsg_list); + + dsg->src_addr = src; + dsg->dst_addr = dest; + dsg->len = len; + + /* Set platform data for m2m */ + txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; + txd->cctl = pl08x->pd->memcpy_channel.cctl_memcpy & + ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); + + /* Both to be incremented or the code will break */ + txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; + + if (pl08x->vd->dualmaster) + txd->cctl |= pl08x_select_bus(pl08x->mem_buses, + pl08x->mem_buses); + + ret = pl08x_fill_llis_for_desc(plchan->host, txd); + if (!ret) { + pl08x_free_txd(pl08x, txd); + return NULL; + } + + return vchan_tx_prep(&plchan->vc, &txd->vd, flags); +} + +static struct pl08x_txd *pl08x_init_txd( + struct dma_chan *chan, + enum dma_transfer_direction direction, + dma_addr_t *slave_addr) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_txd *txd; + enum dma_slave_buswidth addr_width; + int ret, tmp; + u8 src_buses, dst_buses; + u32 maxburst, cctl; + + txd = pl08x_get_txd(plchan); + if (!txd) { + dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); + return NULL; + } + + /* + * Set up addresses, the PrimeCell configured address + * will take precedence since this may configure the + * channel target address dynamically at runtime. + */ + if (direction == DMA_MEM_TO_DEV) { + cctl = PL080_CONTROL_SRC_INCR; + *slave_addr = plchan->cfg.dst_addr; + addr_width = plchan->cfg.dst_addr_width; + maxburst = plchan->cfg.dst_maxburst; + src_buses = pl08x->mem_buses; + dst_buses = plchan->cd->periph_buses; + } else if (direction == DMA_DEV_TO_MEM) { + cctl = PL080_CONTROL_DST_INCR; + *slave_addr = plchan->cfg.src_addr; + addr_width = plchan->cfg.src_addr_width; + maxburst = plchan->cfg.src_maxburst; + src_buses = plchan->cd->periph_buses; + dst_buses = pl08x->mem_buses; + } else { + pl08x_free_txd(pl08x, txd); + dev_err(&pl08x->adev->dev, + "%s direction unsupported\n", __func__); + return NULL; + } + + cctl |= pl08x_get_cctl(plchan, addr_width, maxburst); + if (cctl == ~0) { + pl08x_free_txd(pl08x, txd); + dev_err(&pl08x->adev->dev, + "DMA slave configuration botched?\n"); + return NULL; + } + + txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses); + + if (plchan->cfg.device_fc) + tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER : + PL080_FLOW_PER2MEM_PER; + else + tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER : + PL080_FLOW_PER2MEM; + + txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; + + ret = pl08x_request_mux(plchan); + if (ret < 0) { + pl08x_free_txd(pl08x, txd); + dev_dbg(&pl08x->adev->dev, + "unable to mux for transfer on %s due to platform restrictions\n", + plchan->name); + return NULL; + } + + dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n", + plchan->signal, plchan->name); + + /* Assign the flow control signal to this channel */ + if (direction == DMA_MEM_TO_DEV) + txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT; + else + txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT; + + return txd; +} + +static int pl08x_tx_add_sg(struct pl08x_txd *txd, + enum dma_transfer_direction direction, + dma_addr_t slave_addr, + dma_addr_t buf_addr, + unsigned int len) +{ + struct pl08x_sg *dsg; + + dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); + if (!dsg) + return -ENOMEM; + + list_add_tail(&dsg->node, &txd->dsg_list); + + dsg->len = len; + if (direction == DMA_MEM_TO_DEV) { + dsg->src_addr = buf_addr; + dsg->dst_addr = slave_addr; + } else { + dsg->src_addr = slave_addr; + dsg->dst_addr = buf_addr; + } + + return 0; +} + +static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_txd *txd; + struct scatterlist *sg; + int ret, tmp; + dma_addr_t slave_addr; + + dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", + __func__, sg_dma_len(sgl), plchan->name); + + txd = pl08x_init_txd(chan, direction, &slave_addr); + if (!txd) + return NULL; + + for_each_sg(sgl, sg, sg_len, tmp) { + ret = pl08x_tx_add_sg(txd, direction, slave_addr, + sg_dma_address(sg), + sg_dma_len(sg)); + if (ret) { + pl08x_release_mux(plchan); + pl08x_free_txd(pl08x, txd); + dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n", + __func__); + return NULL; + } + } + + ret = pl08x_fill_llis_for_desc(plchan->host, txd); + if (!ret) { + pl08x_release_mux(plchan); + pl08x_free_txd(pl08x, txd); + return NULL; + } + + return vchan_tx_prep(&plchan->vc, &txd->vd, flags); +} + +static struct dma_async_tx_descriptor *pl08x_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + struct pl08x_txd *txd; + int ret, tmp; + dma_addr_t slave_addr; + + dev_dbg(&pl08x->adev->dev, + "%s prepare cyclic transaction of %zd/%zd bytes %s %s\n", + __func__, period_len, buf_len, + direction == DMA_MEM_TO_DEV ? "to" : "from", + plchan->name); + + txd = pl08x_init_txd(chan, direction, &slave_addr); + if (!txd) + return NULL; + + txd->cyclic = true; + txd->cctl |= PL080_CONTROL_TC_IRQ_EN; + for (tmp = 0; tmp < buf_len; tmp += period_len) { + ret = pl08x_tx_add_sg(txd, direction, slave_addr, + buf_addr + tmp, period_len); + if (ret) { + pl08x_release_mux(plchan); + pl08x_free_txd(pl08x, txd); + return NULL; + } + } + + ret = pl08x_fill_llis_for_desc(plchan->host, txd); + if (!ret) { + pl08x_release_mux(plchan); + pl08x_free_txd(pl08x, txd); + return NULL; + } + + return vchan_tx_prep(&plchan->vc, &txd->vd, flags); +} + +static int pl08x_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + + if (!plchan->slave) + return -EINVAL; + + /* Reject definitely invalid configurations */ + if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || + config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) + return -EINVAL; + + if (config->device_fc && pl08x->vd->pl080s) { + dev_err(&pl08x->adev->dev, + "%s: PL080S does not support peripheral flow control\n", + __func__); + return -EINVAL; + } + + plchan->cfg = *config; + + return 0; +} + +static int pl08x_terminate_all(struct dma_chan *chan) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + struct pl08x_driver_data *pl08x = plchan->host; + unsigned long flags; + + spin_lock_irqsave(&plchan->vc.lock, flags); + if (!plchan->phychan && !plchan->at) { + spin_unlock_irqrestore(&plchan->vc.lock, flags); + return 0; + } + + plchan->state = PL08X_CHAN_IDLE; + + if (plchan->phychan) { + /* + * Mark physical channel as free and free any slave + * signal + */ + pl08x_phy_free(plchan); + } + /* Dequeue jobs and free LLIs */ + if (plchan->at) { + pl08x_desc_free(&plchan->at->vd); + plchan->at = NULL; + } + /* Dequeue jobs not yet fired as well */ + pl08x_free_txd_list(pl08x, plchan); + + spin_unlock_irqrestore(&plchan->vc.lock, flags); + + return 0; +} + +static int pl08x_pause(struct dma_chan *chan) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + unsigned long flags; + + /* + * Anything succeeds on channels with no physical allocation and + * no queued transfers. + */ + spin_lock_irqsave(&plchan->vc.lock, flags); + if (!plchan->phychan && !plchan->at) { + spin_unlock_irqrestore(&plchan->vc.lock, flags); + return 0; + } + + pl08x_pause_phy_chan(plchan->phychan); + plchan->state = PL08X_CHAN_PAUSED; + + spin_unlock_irqrestore(&plchan->vc.lock, flags); + + return 0; +} + +static int pl08x_resume(struct dma_chan *chan) +{ + struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); + unsigned long flags; + + /* + * Anything succeeds on channels with no physical allocation and + * no queued transfers. + */ + spin_lock_irqsave(&plchan->vc.lock, flags); + if (!plchan->phychan && !plchan->at) { + spin_unlock_irqrestore(&plchan->vc.lock, flags); + return 0; + } + + pl08x_resume_phy_chan(plchan->phychan); + plchan->state = PL08X_CHAN_RUNNING; + + spin_unlock_irqrestore(&plchan->vc.lock, flags); + + return 0; +} + +bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) +{ + struct pl08x_dma_chan *plchan; + char *name = chan_id; + + /* Reject channels for devices not bound to this driver */ + if (chan->device->dev->driver != &pl08x_amba_driver.drv) + return false; + + plchan = to_pl08x_chan(chan); + + /* Check that the channel is not taken! */ + if (!strcmp(plchan->name, name)) + return true; + + return false; +} +EXPORT_SYMBOL_GPL(pl08x_filter_id); + +/* + * Just check that the device is there and active + * TODO: turn this bit on/off depending on the number of physical channels + * actually used, if it is zero... well shut it off. That will save some + * power. Cut the clock at the same time. + */ +static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) +{ + /* The Nomadik variant does not have the config register */ + if (pl08x->vd->nomadik) + return; + writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); +} + +static irqreturn_t pl08x_irq(int irq, void *dev) +{ + struct pl08x_driver_data *pl08x = dev; + u32 mask = 0, err, tc, i; + + /* check & clear - ERR & TC interrupts */ + err = readl(pl08x->base + PL080_ERR_STATUS); + if (err) { + dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n", + __func__, err); + writel(err, pl08x->base + PL080_ERR_CLEAR); + } + tc = readl(pl08x->base + PL080_TC_STATUS); + if (tc) + writel(tc, pl08x->base + PL080_TC_CLEAR); + + if (!err && !tc) + return IRQ_NONE; + + for (i = 0; i < pl08x->vd->channels; i++) { + if (((1 << i) & err) || ((1 << i) & tc)) { + /* Locate physical channel */ + struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; + struct pl08x_dma_chan *plchan = phychan->serving; + struct pl08x_txd *tx; + + if (!plchan) { + dev_err(&pl08x->adev->dev, + "%s Error TC interrupt on unused channel: 0x%08x\n", + __func__, i); + continue; + } + + spin_lock(&plchan->vc.lock); + tx = plchan->at; + if (tx && tx->cyclic) { + vchan_cyclic_callback(&tx->vd); + } else if (tx) { + plchan->at = NULL; + /* + * This descriptor is done, release its mux + * reservation. + */ + pl08x_release_mux(plchan); + tx->done = true; + vchan_cookie_complete(&tx->vd); + + /* + * And start the next descriptor (if any), + * otherwise free this channel. + */ + if (vchan_next_desc(&plchan->vc)) + pl08x_start_next_txd(plchan); + else + pl08x_phy_free(plchan); + } + spin_unlock(&plchan->vc.lock); + + mask |= (1 << i); + } + } + + return mask ? IRQ_HANDLED : IRQ_NONE; +} + +static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) +{ + chan->slave = true; + chan->name = chan->cd->bus_id; + chan->cfg.src_addr = chan->cd->addr; + chan->cfg.dst_addr = chan->cd->addr; +} + +/* + * Initialise the DMAC memcpy/slave channels. + * Make a local wrapper to hold required data + */ +static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, + struct dma_device *dmadev, unsigned int channels, bool slave) +{ + struct pl08x_dma_chan *chan; + int i; + + INIT_LIST_HEAD(&dmadev->channels); + + /* + * Register as many many memcpy as we have physical channels, + * we won't always be able to use all but the code will have + * to cope with that situation. + */ + for (i = 0; i < channels; i++) { + chan = kzalloc(sizeof(*chan), GFP_KERNEL); + if (!chan) { + dev_err(&pl08x->adev->dev, + "%s no memory for channel\n", __func__); + return -ENOMEM; + } + + chan->host = pl08x; + chan->state = PL08X_CHAN_IDLE; + chan->signal = -1; + + if (slave) { + chan->cd = &pl08x->pd->slave_channels[i]; + pl08x_dma_slave_init(chan); + } else { + chan->cd = &pl08x->pd->memcpy_channel; + chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); + if (!chan->name) { + kfree(chan); + return -ENOMEM; + } + } + dev_dbg(&pl08x->adev->dev, + "initialize virtual channel \"%s\"\n", + chan->name); + + chan->vc.desc_free = pl08x_desc_free; + vchan_init(&chan->vc, dmadev); + } + dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", + i, slave ? "slave" : "memcpy"); + return i; +} + +static void pl08x_free_virtual_channels(struct dma_device *dmadev) +{ + struct pl08x_dma_chan *chan = NULL; + struct pl08x_dma_chan *next; + + list_for_each_entry_safe(chan, + next, &dmadev->channels, vc.chan.device_node) { + list_del(&chan->vc.chan.device_node); + kfree(chan); + } +} + +#ifdef CONFIG_DEBUG_FS +static const char *pl08x_state_str(enum pl08x_dma_chan_state state) +{ + switch (state) { + case PL08X_CHAN_IDLE: + return "idle"; + case PL08X_CHAN_RUNNING: + return "running"; + case PL08X_CHAN_PAUSED: + return "paused"; + case PL08X_CHAN_WAITING: + return "waiting"; + default: + break; + } + return "UNKNOWN STATE"; +} + +static int pl08x_debugfs_show(struct seq_file *s, void *data) +{ + struct pl08x_driver_data *pl08x = s->private; + struct pl08x_dma_chan *chan; + struct pl08x_phy_chan *ch; + unsigned long flags; + int i; + + seq_printf(s, "PL08x physical channels:\n"); + seq_printf(s, "CHANNEL:\tUSER:\n"); + seq_printf(s, "--------\t-----\n"); + for (i = 0; i < pl08x->vd->channels; i++) { + struct pl08x_dma_chan *virt_chan; + + ch = &pl08x->phy_chans[i]; + + spin_lock_irqsave(&ch->lock, flags); + virt_chan = ch->serving; + + seq_printf(s, "%d\t\t%s%s\n", + ch->id, + virt_chan ? virt_chan->name : "(none)", + ch->locked ? " LOCKED" : ""); + + spin_unlock_irqrestore(&ch->lock, flags); + } + + seq_printf(s, "\nPL08x virtual memcpy channels:\n"); + seq_printf(s, "CHANNEL:\tSTATE:\n"); + seq_printf(s, "--------\t------\n"); + list_for_each_entry(chan, &pl08x->memcpy.channels, vc.chan.device_node) { + seq_printf(s, "%s\t\t%s\n", chan->name, + pl08x_state_str(chan->state)); + } + + seq_printf(s, "\nPL08x virtual slave channels:\n"); + seq_printf(s, "CHANNEL:\tSTATE:\n"); + seq_printf(s, "--------\t------\n"); + list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) { + seq_printf(s, "%s\t\t%s\n", chan->name, + pl08x_state_str(chan->state)); + } + + return 0; +} + +static int pl08x_debugfs_open(struct inode *inode, struct file *file) +{ + return single_open(file, pl08x_debugfs_show, inode->i_private); +} + +static const struct file_operations pl08x_debugfs_operations = { + .open = pl08x_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) +{ + /* Expose a simple debugfs interface to view all clocks */ + (void) debugfs_create_file(dev_name(&pl08x->adev->dev), + S_IFREG | S_IRUGO, NULL, pl08x, + &pl08x_debugfs_operations); +} + +#else +static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) +{ +} +#endif + +static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) +{ + struct pl08x_driver_data *pl08x; + const struct vendor_data *vd = id->data; + u32 tsfr_size; + int ret = 0; + int i; + + ret = amba_request_regions(adev, NULL); + if (ret) + return ret; + + /* Ensure that we can do DMA */ + ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32)); + if (ret) + goto out_no_pl08x; + + /* Create the driver state holder */ + pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL); + if (!pl08x) { + ret = -ENOMEM; + goto out_no_pl08x; + } + + /* Initialize memcpy engine */ + dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); + pl08x->memcpy.dev = &adev->dev; + pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; + pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; + pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; + pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; + pl08x->memcpy.device_issue_pending = pl08x_issue_pending; + pl08x->memcpy.device_config = pl08x_config; + pl08x->memcpy.device_pause = pl08x_pause; + pl08x->memcpy.device_resume = pl08x_resume; + pl08x->memcpy.device_terminate_all = pl08x_terminate_all; + pl08x->memcpy.src_addr_widths = PL80X_DMA_BUSWIDTHS; + pl08x->memcpy.dst_addr_widths = PL80X_DMA_BUSWIDTHS; + pl08x->memcpy.directions = BIT(DMA_MEM_TO_MEM); + pl08x->memcpy.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; + + /* Initialize slave engine */ + dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); + dma_cap_set(DMA_CYCLIC, pl08x->slave.cap_mask); + pl08x->slave.dev = &adev->dev; + pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; + pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; + pl08x->slave.device_tx_status = pl08x_dma_tx_status; + pl08x->slave.device_issue_pending = pl08x_issue_pending; + pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; + pl08x->slave.device_prep_dma_cyclic = pl08x_prep_dma_cyclic; + pl08x->slave.device_config = pl08x_config; + pl08x->slave.device_pause = pl08x_pause; + pl08x->slave.device_resume = pl08x_resume; + pl08x->slave.device_terminate_all = pl08x_terminate_all; + pl08x->slave.src_addr_widths = PL80X_DMA_BUSWIDTHS; + pl08x->slave.dst_addr_widths = PL80X_DMA_BUSWIDTHS; + pl08x->slave.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + pl08x->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; + + /* Get the platform data */ + pl08x->pd = dev_get_platdata(&adev->dev); + if (!pl08x->pd) { + dev_err(&adev->dev, "no platform data supplied\n"); + ret = -EINVAL; + goto out_no_platdata; + } + + /* Assign useful pointers to the driver state */ + pl08x->adev = adev; + pl08x->vd = vd; + + /* By default, AHB1 only. If dualmaster, from platform */ + pl08x->lli_buses = PL08X_AHB1; + pl08x->mem_buses = PL08X_AHB1; + if (pl08x->vd->dualmaster) { + pl08x->lli_buses = pl08x->pd->lli_buses; + pl08x->mem_buses = pl08x->pd->mem_buses; + } + + if (vd->pl080s) + pl08x->lli_words = PL080S_LLI_WORDS; + else + pl08x->lli_words = PL080_LLI_WORDS; + tsfr_size = MAX_NUM_TSFR_LLIS * pl08x->lli_words * sizeof(u32); + + /* A DMA memory pool for LLIs, align on 1-byte boundary */ + pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, + tsfr_size, PL08X_ALIGN, 0); + if (!pl08x->pool) { + ret = -ENOMEM; + goto out_no_lli_pool; + } + + pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); + if (!pl08x->base) { + ret = -ENOMEM; + goto out_no_ioremap; + } + + /* Turn on the PL08x */ + pl08x_ensure_on(pl08x); + + /* Attach the interrupt handler */ + writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); + writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); + + ret = request_irq(adev->irq[0], pl08x_irq, 0, DRIVER_NAME, pl08x); + if (ret) { + dev_err(&adev->dev, "%s failed to request interrupt %d\n", + __func__, adev->irq[0]); + goto out_no_irq; + } + + /* Initialize physical channels */ + pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)), + GFP_KERNEL); + if (!pl08x->phy_chans) { + dev_err(&adev->dev, "%s failed to allocate " + "physical channel holders\n", + __func__); + ret = -ENOMEM; + goto out_no_phychans; + } + + for (i = 0; i < vd->channels; i++) { + struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; + + ch->id = i; + ch->base = pl08x->base + PL080_Cx_BASE(i); + ch->reg_config = ch->base + vd->config_offset; + spin_lock_init(&ch->lock); + + /* + * Nomadik variants can have channels that are locked + * down for the secure world only. Lock up these channels + * by perpetually serving a dummy virtual channel. + */ + if (vd->nomadik) { + u32 val; + + val = readl(ch->reg_config); + if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) { + dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i); + ch->locked = true; + } + } + + dev_dbg(&adev->dev, "physical channel %d is %s\n", + i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); + } + + /* Register as many memcpy channels as there are physical channels */ + ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, + pl08x->vd->channels, false); + if (ret <= 0) { + dev_warn(&pl08x->adev->dev, + "%s failed to enumerate memcpy channels - %d\n", + __func__, ret); + goto out_no_memcpy; + } + + /* Register slave channels */ + ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, + pl08x->pd->num_slave_channels, true); + if (ret < 0) { + dev_warn(&pl08x->adev->dev, + "%s failed to enumerate slave channels - %d\n", + __func__, ret); + goto out_no_slave; + } + + ret = dma_async_device_register(&pl08x->memcpy); + if (ret) { + dev_warn(&pl08x->adev->dev, + "%s failed to register memcpy as an async device - %d\n", + __func__, ret); + goto out_no_memcpy_reg; + } + + ret = dma_async_device_register(&pl08x->slave); + if (ret) { + dev_warn(&pl08x->adev->dev, + "%s failed to register slave as an async device - %d\n", + __func__, ret); + goto out_no_slave_reg; + } + + amba_set_drvdata(adev, pl08x); + init_pl08x_debugfs(pl08x); + dev_info(&pl08x->adev->dev, "DMA: PL%03x%s rev%u at 0x%08llx irq %d\n", + amba_part(adev), pl08x->vd->pl080s ? "s" : "", amba_rev(adev), + (unsigned long long)adev->res.start, adev->irq[0]); + + return 0; + +out_no_slave_reg: + dma_async_device_unregister(&pl08x->memcpy); +out_no_memcpy_reg: + pl08x_free_virtual_channels(&pl08x->slave); +out_no_slave: + pl08x_free_virtual_channels(&pl08x->memcpy); +out_no_memcpy: + kfree(pl08x->phy_chans); +out_no_phychans: + free_irq(adev->irq[0], pl08x); +out_no_irq: + iounmap(pl08x->base); +out_no_ioremap: + dma_pool_destroy(pl08x->pool); +out_no_lli_pool: +out_no_platdata: + kfree(pl08x); +out_no_pl08x: + amba_release_regions(adev); + return ret; +} + +/* PL080 has 8 channels and the PL080 have just 2 */ +static struct vendor_data vendor_pl080 = { + .config_offset = PL080_CH_CONFIG, + .channels = 8, + .dualmaster = true, + .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, +}; + +static struct vendor_data vendor_nomadik = { + .config_offset = PL080_CH_CONFIG, + .channels = 8, + .dualmaster = true, + .nomadik = true, + .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, +}; + +static struct vendor_data vendor_pl080s = { + .config_offset = PL080S_CH_CONFIG, + .channels = 8, + .pl080s = true, + .max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK, +}; + +static struct vendor_data vendor_pl081 = { + .config_offset = PL080_CH_CONFIG, + .channels = 2, + .dualmaster = false, + .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, +}; + +static struct amba_id pl08x_ids[] = { + /* Samsung PL080S variant */ + { + .id = 0x0a141080, + .mask = 0xffffffff, + .data = &vendor_pl080s, + }, + /* PL080 */ + { + .id = 0x00041080, + .mask = 0x000fffff, + .data = &vendor_pl080, + }, + /* PL081 */ + { + .id = 0x00041081, + .mask = 0x000fffff, + .data = &vendor_pl081, + }, + /* Nomadik 8815 PL080 variant */ + { + .id = 0x00280080, + .mask = 0x00ffffff, + .data = &vendor_nomadik, + }, + { 0, 0 }, +}; + +MODULE_DEVICE_TABLE(amba, pl08x_ids); + +static struct amba_driver pl08x_amba_driver = { + .drv.name = DRIVER_NAME, + .id_table = pl08x_ids, + .probe = pl08x_probe, +}; + +static int __init pl08x_init(void) +{ + int retval; + retval = amba_driver_register(&pl08x_amba_driver); + if (retval) + printk(KERN_WARNING DRIVER_NAME + "failed to register as an AMBA device (%d)\n", + retval); + return retval; +} +subsys_initcall(pl08x_init); diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c new file mode 100644 index 000000000..57b2141dd --- /dev/null +++ b/drivers/dma/at_hdmac.c @@ -0,0 +1,1963 @@ +/* + * Driver for the Atmel AHB DMA Controller (aka HDMA or DMAC on AT91 systems) + * + * Copyright (C) 2008 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * + * This supports the Atmel AHB DMA Controller found in several Atmel SoCs. + * The only Atmel DMA Controller that is not covered by this driver is the one + * found on AT91SAM9263. + */ + +#include <dt-bindings/dma/at91.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> + +#include "at_hdmac_regs.h" +#include "dmaengine.h" + +/* + * Glossary + * -------- + * + * at_hdmac : Name of the ATmel AHB DMA Controller + * at_dma_ / atdma : ATmel DMA controller entity related + * atc_ / atchan : ATmel DMA Channel entity related + */ + +#define ATC_DEFAULT_CFG (ATC_FIFOCFG_HALFFIFO) +#define ATC_DEFAULT_CTRLB (ATC_SIF(AT_DMA_MEM_IF) \ + |ATC_DIF(AT_DMA_MEM_IF)) +#define ATC_DMA_BUSWIDTHS\ + (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) + +/* + * Initial number of descriptors to allocate for each channel. This could + * be increased during dma usage. + */ +static unsigned int init_nr_desc_per_channel = 64; +module_param(init_nr_desc_per_channel, uint, 0644); +MODULE_PARM_DESC(init_nr_desc_per_channel, + "initial descriptors per channel (default: 64)"); + + +/* prototypes */ +static dma_cookie_t atc_tx_submit(struct dma_async_tx_descriptor *tx); +static void atc_issue_pending(struct dma_chan *chan); + + +/*----------------------------------------------------------------------*/ + +static inline unsigned int atc_get_xfer_width(dma_addr_t src, dma_addr_t dst, + size_t len) +{ + unsigned int width; + + if (!((src | dst | len) & 3)) + width = 2; + else if (!((src | dst | len) & 1)) + width = 1; + else + width = 0; + + return width; +} + +static struct at_desc *atc_first_active(struct at_dma_chan *atchan) +{ + return list_first_entry(&atchan->active_list, + struct at_desc, desc_node); +} + +static struct at_desc *atc_first_queued(struct at_dma_chan *atchan) +{ + return list_first_entry(&atchan->queue, + struct at_desc, desc_node); +} + +/** + * atc_alloc_descriptor - allocate and return an initialized descriptor + * @chan: the channel to allocate descriptors for + * @gfp_flags: GFP allocation flags + * + * Note: The ack-bit is positioned in the descriptor flag at creation time + * to make initial allocation more convenient. This bit will be cleared + * and control will be given to client at usage time (during + * preparation functions). + */ +static struct at_desc *atc_alloc_descriptor(struct dma_chan *chan, + gfp_t gfp_flags) +{ + struct at_desc *desc = NULL; + struct at_dma *atdma = to_at_dma(chan->device); + dma_addr_t phys; + + desc = dma_pool_alloc(atdma->dma_desc_pool, gfp_flags, &phys); + if (desc) { + memset(desc, 0, sizeof(struct at_desc)); + INIT_LIST_HEAD(&desc->tx_list); + dma_async_tx_descriptor_init(&desc->txd, chan); + /* txd.flags will be overwritten in prep functions */ + desc->txd.flags = DMA_CTRL_ACK; + desc->txd.tx_submit = atc_tx_submit; + desc->txd.phys = phys; + } + + return desc; +} + +/** + * atc_desc_get - get an unused descriptor from free_list + * @atchan: channel we want a new descriptor for + */ +static struct at_desc *atc_desc_get(struct at_dma_chan *atchan) +{ + struct at_desc *desc, *_desc; + struct at_desc *ret = NULL; + unsigned long flags; + unsigned int i = 0; + LIST_HEAD(tmp_list); + + spin_lock_irqsave(&atchan->lock, flags); + list_for_each_entry_safe(desc, _desc, &atchan->free_list, desc_node) { + i++; + if (async_tx_test_ack(&desc->txd)) { + list_del(&desc->desc_node); + ret = desc; + break; + } + dev_dbg(chan2dev(&atchan->chan_common), + "desc %p not ACKed\n", desc); + } + spin_unlock_irqrestore(&atchan->lock, flags); + dev_vdbg(chan2dev(&atchan->chan_common), + "scanned %u descriptors on freelist\n", i); + + /* no more descriptor available in initial pool: create one more */ + if (!ret) { + ret = atc_alloc_descriptor(&atchan->chan_common, GFP_ATOMIC); + if (ret) { + spin_lock_irqsave(&atchan->lock, flags); + atchan->descs_allocated++; + spin_unlock_irqrestore(&atchan->lock, flags); + } else { + dev_err(chan2dev(&atchan->chan_common), + "not enough descriptors available\n"); + } + } + + return ret; +} + +/** + * atc_desc_put - move a descriptor, including any children, to the free list + * @atchan: channel we work on + * @desc: descriptor, at the head of a chain, to move to free list + */ +static void atc_desc_put(struct at_dma_chan *atchan, struct at_desc *desc) +{ + if (desc) { + struct at_desc *child; + unsigned long flags; + + spin_lock_irqsave(&atchan->lock, flags); + list_for_each_entry(child, &desc->tx_list, desc_node) + dev_vdbg(chan2dev(&atchan->chan_common), + "moving child desc %p to freelist\n", + child); + list_splice_init(&desc->tx_list, &atchan->free_list); + dev_vdbg(chan2dev(&atchan->chan_common), + "moving desc %p to freelist\n", desc); + list_add(&desc->desc_node, &atchan->free_list); + spin_unlock_irqrestore(&atchan->lock, flags); + } +} + +/** + * atc_desc_chain - build chain adding a descriptor + * @first: address of first descriptor of the chain + * @prev: address of previous descriptor of the chain + * @desc: descriptor to queue + * + * Called from prep_* functions + */ +static void atc_desc_chain(struct at_desc **first, struct at_desc **prev, + struct at_desc *desc) +{ + if (!(*first)) { + *first = desc; + } else { + /* inform the HW lli about chaining */ + (*prev)->lli.dscr = desc->txd.phys; + /* insert the link descriptor to the LD ring */ + list_add_tail(&desc->desc_node, + &(*first)->tx_list); + } + *prev = desc; +} + +/** + * atc_dostart - starts the DMA engine for real + * @atchan: the channel we want to start + * @first: first descriptor in the list we want to begin with + * + * Called with atchan->lock held and bh disabled + */ +static void atc_dostart(struct at_dma_chan *atchan, struct at_desc *first) +{ + struct at_dma *atdma = to_at_dma(atchan->chan_common.device); + + /* ASSERT: channel is idle */ + if (atc_chan_is_enabled(atchan)) { + dev_err(chan2dev(&atchan->chan_common), + "BUG: Attempted to start non-idle channel\n"); + dev_err(chan2dev(&atchan->chan_common), + " channel: s0x%x d0x%x ctrl0x%x:0x%x l0x%x\n", + channel_readl(atchan, SADDR), + channel_readl(atchan, DADDR), + channel_readl(atchan, CTRLA), + channel_readl(atchan, CTRLB), + channel_readl(atchan, DSCR)); + + /* The tasklet will hopefully advance the queue... */ + return; + } + + vdbg_dump_regs(atchan); + + channel_writel(atchan, SADDR, 0); + channel_writel(atchan, DADDR, 0); + channel_writel(atchan, CTRLA, 0); + channel_writel(atchan, CTRLB, 0); + channel_writel(atchan, DSCR, first->txd.phys); + dma_writel(atdma, CHER, atchan->mask); + + vdbg_dump_regs(atchan); +} + +/* + * atc_get_desc_by_cookie - get the descriptor of a cookie + * @atchan: the DMA channel + * @cookie: the cookie to get the descriptor for + */ +static struct at_desc *atc_get_desc_by_cookie(struct at_dma_chan *atchan, + dma_cookie_t cookie) +{ + struct at_desc *desc, *_desc; + + list_for_each_entry_safe(desc, _desc, &atchan->queue, desc_node) { + if (desc->txd.cookie == cookie) + return desc; + } + + list_for_each_entry_safe(desc, _desc, &atchan->active_list, desc_node) { + if (desc->txd.cookie == cookie) + return desc; + } + + return NULL; +} + +/** + * atc_calc_bytes_left - calculates the number of bytes left according to the + * value read from CTRLA. + * + * @current_len: the number of bytes left before reading CTRLA + * @ctrla: the value of CTRLA + * @desc: the descriptor containing the transfer width + */ +static inline int atc_calc_bytes_left(int current_len, u32 ctrla, + struct at_desc *desc) +{ + return current_len - ((ctrla & ATC_BTSIZE_MAX) << desc->tx_width); +} + +/** + * atc_calc_bytes_left_from_reg - calculates the number of bytes left according + * to the current value of CTRLA. + * + * @current_len: the number of bytes left before reading CTRLA + * @atchan: the channel to read CTRLA for + * @desc: the descriptor containing the transfer width + */ +static inline int atc_calc_bytes_left_from_reg(int current_len, + struct at_dma_chan *atchan, struct at_desc *desc) +{ + u32 ctrla = channel_readl(atchan, CTRLA); + + return atc_calc_bytes_left(current_len, ctrla, desc); +} + +/** + * atc_get_bytes_left - get the number of bytes residue for a cookie + * @chan: DMA channel + * @cookie: transaction identifier to check status of + */ +static int atc_get_bytes_left(struct dma_chan *chan, dma_cookie_t cookie) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_desc *desc_first = atc_first_active(atchan); + struct at_desc *desc; + int ret; + u32 ctrla, dscr; + + /* + * If the cookie doesn't match to the currently running transfer then + * we can return the total length of the associated DMA transfer, + * because it is still queued. + */ + desc = atc_get_desc_by_cookie(atchan, cookie); + if (desc == NULL) + return -EINVAL; + else if (desc != desc_first) + return desc->total_len; + + /* cookie matches to the currently running transfer */ + ret = desc_first->total_len; + + if (desc_first->lli.dscr) { + /* hardware linked list transfer */ + + /* + * Calculate the residue by removing the length of the child + * descriptors already transferred from the total length. + * To get the current child descriptor we can use the value of + * the channel's DSCR register and compare it against the value + * of the hardware linked list structure of each child + * descriptor. + */ + + ctrla = channel_readl(atchan, CTRLA); + rmb(); /* ensure CTRLA is read before DSCR */ + dscr = channel_readl(atchan, DSCR); + + /* for the first descriptor we can be more accurate */ + if (desc_first->lli.dscr == dscr) + return atc_calc_bytes_left(ret, ctrla, desc_first); + + ret -= desc_first->len; + list_for_each_entry(desc, &desc_first->tx_list, desc_node) { + if (desc->lli.dscr == dscr) + break; + + ret -= desc->len; + } + + /* + * For the last descriptor in the chain we can calculate + * the remaining bytes using the channel's register. + * Note that the transfer width of the first and last + * descriptor may differ. + */ + if (!desc->lli.dscr) + ret = atc_calc_bytes_left_from_reg(ret, atchan, desc); + } else { + /* single transfer */ + ret = atc_calc_bytes_left_from_reg(ret, atchan, desc_first); + } + + return ret; +} + +/** + * atc_chain_complete - finish work for one transaction chain + * @atchan: channel we work on + * @desc: descriptor at the head of the chain we want do complete + * + * Called with atchan->lock held and bh disabled */ +static void +atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc) +{ + struct dma_async_tx_descriptor *txd = &desc->txd; + + dev_vdbg(chan2dev(&atchan->chan_common), + "descriptor %u complete\n", txd->cookie); + + /* mark the descriptor as complete for non cyclic cases only */ + if (!atc_chan_is_cyclic(atchan)) + dma_cookie_complete(txd); + + /* move children to free_list */ + list_splice_init(&desc->tx_list, &atchan->free_list); + /* move myself to free_list */ + list_move(&desc->desc_node, &atchan->free_list); + + dma_descriptor_unmap(txd); + /* for cyclic transfers, + * no need to replay callback function while stopping */ + if (!atc_chan_is_cyclic(atchan)) { + dma_async_tx_callback callback = txd->callback; + void *param = txd->callback_param; + + /* + * The API requires that no submissions are done from a + * callback, so we don't need to drop the lock here + */ + if (callback) + callback(param); + } + + dma_run_dependencies(txd); +} + +/** + * atc_complete_all - finish work for all transactions + * @atchan: channel to complete transactions for + * + * Eventually submit queued descriptors if any + * + * Assume channel is idle while calling this function + * Called with atchan->lock held and bh disabled + */ +static void atc_complete_all(struct at_dma_chan *atchan) +{ + struct at_desc *desc, *_desc; + LIST_HEAD(list); + + dev_vdbg(chan2dev(&atchan->chan_common), "complete all\n"); + + /* + * Submit queued descriptors ASAP, i.e. before we go through + * the completed ones. + */ + if (!list_empty(&atchan->queue)) + atc_dostart(atchan, atc_first_queued(atchan)); + /* empty active_list now it is completed */ + list_splice_init(&atchan->active_list, &list); + /* empty queue list by moving descriptors (if any) to active_list */ + list_splice_init(&atchan->queue, &atchan->active_list); + + list_for_each_entry_safe(desc, _desc, &list, desc_node) + atc_chain_complete(atchan, desc); +} + +/** + * atc_advance_work - at the end of a transaction, move forward + * @atchan: channel where the transaction ended + * + * Called with atchan->lock held and bh disabled + */ +static void atc_advance_work(struct at_dma_chan *atchan) +{ + dev_vdbg(chan2dev(&atchan->chan_common), "advance_work\n"); + + if (atc_chan_is_enabled(atchan)) + return; + + if (list_empty(&atchan->active_list) || + list_is_singular(&atchan->active_list)) { + atc_complete_all(atchan); + } else { + atc_chain_complete(atchan, atc_first_active(atchan)); + /* advance work */ + atc_dostart(atchan, atc_first_active(atchan)); + } +} + + +/** + * atc_handle_error - handle errors reported by DMA controller + * @atchan: channel where error occurs + * + * Called with atchan->lock held and bh disabled + */ +static void atc_handle_error(struct at_dma_chan *atchan) +{ + struct at_desc *bad_desc; + struct at_desc *child; + + /* + * The descriptor currently at the head of the active list is + * broked. Since we don't have any way to report errors, we'll + * just have to scream loudly and try to carry on. + */ + bad_desc = atc_first_active(atchan); + list_del_init(&bad_desc->desc_node); + + /* As we are stopped, take advantage to push queued descriptors + * in active_list */ + list_splice_init(&atchan->queue, atchan->active_list.prev); + + /* Try to restart the controller */ + if (!list_empty(&atchan->active_list)) + atc_dostart(atchan, atc_first_active(atchan)); + + /* + * KERN_CRITICAL may seem harsh, but since this only happens + * when someone submits a bad physical address in a + * descriptor, we should consider ourselves lucky that the + * controller flagged an error instead of scribbling over + * random memory locations. + */ + dev_crit(chan2dev(&atchan->chan_common), + "Bad descriptor submitted for DMA!\n"); + dev_crit(chan2dev(&atchan->chan_common), + " cookie: %d\n", bad_desc->txd.cookie); + atc_dump_lli(atchan, &bad_desc->lli); + list_for_each_entry(child, &bad_desc->tx_list, desc_node) + atc_dump_lli(atchan, &child->lli); + + /* Pretend the descriptor completed successfully */ + atc_chain_complete(atchan, bad_desc); +} + +/** + * atc_handle_cyclic - at the end of a period, run callback function + * @atchan: channel used for cyclic operations + * + * Called with atchan->lock held and bh disabled + */ +static void atc_handle_cyclic(struct at_dma_chan *atchan) +{ + struct at_desc *first = atc_first_active(atchan); + struct dma_async_tx_descriptor *txd = &first->txd; + dma_async_tx_callback callback = txd->callback; + void *param = txd->callback_param; + + dev_vdbg(chan2dev(&atchan->chan_common), + "new cyclic period llp 0x%08x\n", + channel_readl(atchan, DSCR)); + + if (callback) + callback(param); +} + +/*-- IRQ & Tasklet ---------------------------------------------------*/ + +static void atc_tasklet(unsigned long data) +{ + struct at_dma_chan *atchan = (struct at_dma_chan *)data; + unsigned long flags; + + spin_lock_irqsave(&atchan->lock, flags); + if (test_and_clear_bit(ATC_IS_ERROR, &atchan->status)) + atc_handle_error(atchan); + else if (atc_chan_is_cyclic(atchan)) + atc_handle_cyclic(atchan); + else + atc_advance_work(atchan); + + spin_unlock_irqrestore(&atchan->lock, flags); +} + +static irqreturn_t at_dma_interrupt(int irq, void *dev_id) +{ + struct at_dma *atdma = (struct at_dma *)dev_id; + struct at_dma_chan *atchan; + int i; + u32 status, pending, imr; + int ret = IRQ_NONE; + + do { + imr = dma_readl(atdma, EBCIMR); + status = dma_readl(atdma, EBCISR); + pending = status & imr; + + if (!pending) + break; + + dev_vdbg(atdma->dma_common.dev, + "interrupt: status = 0x%08x, 0x%08x, 0x%08x\n", + status, imr, pending); + + for (i = 0; i < atdma->dma_common.chancnt; i++) { + atchan = &atdma->chan[i]; + if (pending & (AT_DMA_BTC(i) | AT_DMA_ERR(i))) { + if (pending & AT_DMA_ERR(i)) { + /* Disable channel on AHB error */ + dma_writel(atdma, CHDR, + AT_DMA_RES(i) | atchan->mask); + /* Give information to tasklet */ + set_bit(ATC_IS_ERROR, &atchan->status); + } + tasklet_schedule(&atchan->tasklet); + ret = IRQ_HANDLED; + } + } + + } while (pending); + + return ret; +} + + +/*-- DMA Engine API --------------------------------------------------*/ + +/** + * atc_tx_submit - set the prepared descriptor(s) to be executed by the engine + * @desc: descriptor at the head of the transaction chain + * + * Queue chain if DMA engine is working already + * + * Cookie increment and adding to active_list or queue must be atomic + */ +static dma_cookie_t atc_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct at_desc *desc = txd_to_at_desc(tx); + struct at_dma_chan *atchan = to_at_dma_chan(tx->chan); + dma_cookie_t cookie; + unsigned long flags; + + spin_lock_irqsave(&atchan->lock, flags); + cookie = dma_cookie_assign(tx); + + if (list_empty(&atchan->active_list)) { + dev_vdbg(chan2dev(tx->chan), "tx_submit: started %u\n", + desc->txd.cookie); + atc_dostart(atchan, desc); + list_add_tail(&desc->desc_node, &atchan->active_list); + } else { + dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u\n", + desc->txd.cookie); + list_add_tail(&desc->desc_node, &atchan->queue); + } + + spin_unlock_irqrestore(&atchan->lock, flags); + + return cookie; +} + +/** + * atc_prep_dma_memcpy - prepare a memcpy operation + * @chan: the channel to prepare operation on + * @dest: operation virtual destination address + * @src: operation virtual source address + * @len: operation length + * @flags: tx descriptor status flags + */ +static struct dma_async_tx_descriptor * +atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_desc *desc = NULL; + struct at_desc *first = NULL; + struct at_desc *prev = NULL; + size_t xfer_count; + size_t offset; + unsigned int src_width; + unsigned int dst_width; + u32 ctrla; + u32 ctrlb; + + dev_vdbg(chan2dev(chan), "prep_dma_memcpy: d0x%x s0x%x l0x%zx f0x%lx\n", + dest, src, len, flags); + + if (unlikely(!len)) { + dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n"); + return NULL; + } + + ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN + | ATC_SRC_ADDR_MODE_INCR + | ATC_DST_ADDR_MODE_INCR + | ATC_FC_MEM2MEM; + + /* + * We can be a lot more clever here, but this should take care + * of the most common optimization. + */ + src_width = dst_width = atc_get_xfer_width(src, dest, len); + + ctrla = ATC_SRC_WIDTH(src_width) | + ATC_DST_WIDTH(dst_width); + + for (offset = 0; offset < len; offset += xfer_count << src_width) { + xfer_count = min_t(size_t, (len - offset) >> src_width, + ATC_BTSIZE_MAX); + + desc = atc_desc_get(atchan); + if (!desc) + goto err_desc_get; + + desc->lli.saddr = src + offset; + desc->lli.daddr = dest + offset; + desc->lli.ctrla = ctrla | xfer_count; + desc->lli.ctrlb = ctrlb; + + desc->txd.cookie = 0; + desc->len = xfer_count << src_width; + + atc_desc_chain(&first, &prev, desc); + } + + /* First descriptor of the chain embedds additional information */ + first->txd.cookie = -EBUSY; + first->total_len = len; + + /* set transfer width for the calculation of the residue */ + first->tx_width = src_width; + prev->tx_width = src_width; + + /* set end-of-link to the last link descriptor of list*/ + set_desc_eol(desc); + + first->txd.flags = flags; /* client is in control of this ack */ + + return &first->txd; + +err_desc_get: + atc_desc_put(atchan, first); + return NULL; +} + + +/** + * atc_prep_slave_sg - prepare descriptors for a DMA_SLAVE transaction + * @chan: DMA channel + * @sgl: scatterlist to transfer to/from + * @sg_len: number of entries in @scatterlist + * @direction: DMA direction + * @flags: tx descriptor status flags + * @context: transaction context (ignored) + */ +static struct dma_async_tx_descriptor * +atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma_slave *atslave = chan->private; + struct dma_slave_config *sconfig = &atchan->dma_sconfig; + struct at_desc *first = NULL; + struct at_desc *prev = NULL; + u32 ctrla; + u32 ctrlb; + dma_addr_t reg; + unsigned int reg_width; + unsigned int mem_width; + unsigned int i; + struct scatterlist *sg; + size_t total_len = 0; + + dev_vdbg(chan2dev(chan), "prep_slave_sg (%d): %s f0x%lx\n", + sg_len, + direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE", + flags); + + if (unlikely(!atslave || !sg_len)) { + dev_dbg(chan2dev(chan), "prep_slave_sg: sg length is zero!\n"); + return NULL; + } + + ctrla = ATC_SCSIZE(sconfig->src_maxburst) + | ATC_DCSIZE(sconfig->dst_maxburst); + ctrlb = ATC_IEN; + + switch (direction) { + case DMA_MEM_TO_DEV: + reg_width = convert_buswidth(sconfig->dst_addr_width); + ctrla |= ATC_DST_WIDTH(reg_width); + ctrlb |= ATC_DST_ADDR_MODE_FIXED + | ATC_SRC_ADDR_MODE_INCR + | ATC_FC_MEM2PER + | ATC_SIF(atchan->mem_if) | ATC_DIF(atchan->per_if); + reg = sconfig->dst_addr; + for_each_sg(sgl, sg, sg_len, i) { + struct at_desc *desc; + u32 len; + u32 mem; + + desc = atc_desc_get(atchan); + if (!desc) + goto err_desc_get; + + mem = sg_dma_address(sg); + len = sg_dma_len(sg); + if (unlikely(!len)) { + dev_dbg(chan2dev(chan), + "prep_slave_sg: sg(%d) data length is zero\n", i); + goto err; + } + mem_width = 2; + if (unlikely(mem & 3 || len & 3)) + mem_width = 0; + + desc->lli.saddr = mem; + desc->lli.daddr = reg; + desc->lli.ctrla = ctrla + | ATC_SRC_WIDTH(mem_width) + | len >> mem_width; + desc->lli.ctrlb = ctrlb; + desc->len = len; + + atc_desc_chain(&first, &prev, desc); + total_len += len; + } + break; + case DMA_DEV_TO_MEM: + reg_width = convert_buswidth(sconfig->src_addr_width); + ctrla |= ATC_SRC_WIDTH(reg_width); + ctrlb |= ATC_DST_ADDR_MODE_INCR + | ATC_SRC_ADDR_MODE_FIXED + | ATC_FC_PER2MEM + | ATC_SIF(atchan->per_if) | ATC_DIF(atchan->mem_if); + + reg = sconfig->src_addr; + for_each_sg(sgl, sg, sg_len, i) { + struct at_desc *desc; + u32 len; + u32 mem; + + desc = atc_desc_get(atchan); + if (!desc) + goto err_desc_get; + + mem = sg_dma_address(sg); + len = sg_dma_len(sg); + if (unlikely(!len)) { + dev_dbg(chan2dev(chan), + "prep_slave_sg: sg(%d) data length is zero\n", i); + goto err; + } + mem_width = 2; + if (unlikely(mem & 3 || len & 3)) + mem_width = 0; + + desc->lli.saddr = reg; + desc->lli.daddr = mem; + desc->lli.ctrla = ctrla + | ATC_DST_WIDTH(mem_width) + | len >> reg_width; + desc->lli.ctrlb = ctrlb; + desc->len = len; + + atc_desc_chain(&first, &prev, desc); + total_len += len; + } + break; + default: + return NULL; + } + + /* set end-of-link to the last link descriptor of list*/ + set_desc_eol(prev); + + /* First descriptor of the chain embedds additional information */ + first->txd.cookie = -EBUSY; + first->total_len = total_len; + + /* set transfer width for the calculation of the residue */ + first->tx_width = reg_width; + prev->tx_width = reg_width; + + /* first link descriptor of list is responsible of flags */ + first->txd.flags = flags; /* client is in control of this ack */ + + return &first->txd; + +err_desc_get: + dev_err(chan2dev(chan), "not enough descriptors available\n"); +err: + atc_desc_put(atchan, first); + return NULL; +} + +/** + * atc_prep_dma_sg - prepare memory to memory scather-gather operation + * @chan: the channel to prepare operation on + * @dst_sg: destination scatterlist + * @dst_nents: number of destination scatterlist entries + * @src_sg: source scatterlist + * @src_nents: number of source scatterlist entries + * @flags: tx descriptor status flags + */ +static struct dma_async_tx_descriptor * +atc_prep_dma_sg(struct dma_chan *chan, + struct scatterlist *dst_sg, unsigned int dst_nents, + struct scatterlist *src_sg, unsigned int src_nents, + unsigned long flags) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_desc *desc = NULL; + struct at_desc *first = NULL; + struct at_desc *prev = NULL; + unsigned int src_width; + unsigned int dst_width; + size_t xfer_count; + u32 ctrla; + u32 ctrlb; + size_t dst_len = 0, src_len = 0; + dma_addr_t dst = 0, src = 0; + size_t len = 0, total_len = 0; + + if (unlikely(dst_nents == 0 || src_nents == 0)) + return NULL; + + if (unlikely(dst_sg == NULL || src_sg == NULL)) + return NULL; + + ctrlb = ATC_DEFAULT_CTRLB | ATC_IEN + | ATC_SRC_ADDR_MODE_INCR + | ATC_DST_ADDR_MODE_INCR + | ATC_FC_MEM2MEM; + + /* + * loop until there is either no more source or no more destination + * scatterlist entry + */ + while (true) { + + /* prepare the next transfer */ + if (dst_len == 0) { + + /* no more destination scatterlist entries */ + if (!dst_sg || !dst_nents) + break; + + dst = sg_dma_address(dst_sg); + dst_len = sg_dma_len(dst_sg); + + dst_sg = sg_next(dst_sg); + dst_nents--; + } + + if (src_len == 0) { + + /* no more source scatterlist entries */ + if (!src_sg || !src_nents) + break; + + src = sg_dma_address(src_sg); + src_len = sg_dma_len(src_sg); + + src_sg = sg_next(src_sg); + src_nents--; + } + + len = min_t(size_t, src_len, dst_len); + if (len == 0) + continue; + + /* take care for the alignment */ + src_width = dst_width = atc_get_xfer_width(src, dst, len); + + ctrla = ATC_SRC_WIDTH(src_width) | + ATC_DST_WIDTH(dst_width); + + /* + * The number of transfers to set up refer to the source width + * that depends on the alignment. + */ + xfer_count = len >> src_width; + if (xfer_count > ATC_BTSIZE_MAX) { + xfer_count = ATC_BTSIZE_MAX; + len = ATC_BTSIZE_MAX << src_width; + } + + /* create the transfer */ + desc = atc_desc_get(atchan); + if (!desc) + goto err_desc_get; + + desc->lli.saddr = src; + desc->lli.daddr = dst; + desc->lli.ctrla = ctrla | xfer_count; + desc->lli.ctrlb = ctrlb; + + desc->txd.cookie = 0; + desc->len = len; + + /* + * Although we only need the transfer width for the first and + * the last descriptor, its easier to set it to all descriptors. + */ + desc->tx_width = src_width; + + atc_desc_chain(&first, &prev, desc); + + /* update the lengths and addresses for the next loop cycle */ + dst_len -= len; + src_len -= len; + dst += len; + src += len; + + total_len += len; + } + + /* First descriptor of the chain embedds additional information */ + first->txd.cookie = -EBUSY; + first->total_len = total_len; + + /* set end-of-link to the last link descriptor of list*/ + set_desc_eol(desc); + + first->txd.flags = flags; /* client is in control of this ack */ + + return &first->txd; + +err_desc_get: + atc_desc_put(atchan, first); + return NULL; +} + +/** + * atc_dma_cyclic_check_values + * Check for too big/unaligned periods and unaligned DMA buffer + */ +static int +atc_dma_cyclic_check_values(unsigned int reg_width, dma_addr_t buf_addr, + size_t period_len) +{ + if (period_len > (ATC_BTSIZE_MAX << reg_width)) + goto err_out; + if (unlikely(period_len & ((1 << reg_width) - 1))) + goto err_out; + if (unlikely(buf_addr & ((1 << reg_width) - 1))) + goto err_out; + + return 0; + +err_out: + return -EINVAL; +} + +/** + * atc_dma_cyclic_fill_desc - Fill one period descriptor + */ +static int +atc_dma_cyclic_fill_desc(struct dma_chan *chan, struct at_desc *desc, + unsigned int period_index, dma_addr_t buf_addr, + unsigned int reg_width, size_t period_len, + enum dma_transfer_direction direction) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct dma_slave_config *sconfig = &atchan->dma_sconfig; + u32 ctrla; + + /* prepare common CRTLA value */ + ctrla = ATC_SCSIZE(sconfig->src_maxburst) + | ATC_DCSIZE(sconfig->dst_maxburst) + | ATC_DST_WIDTH(reg_width) + | ATC_SRC_WIDTH(reg_width) + | period_len >> reg_width; + + switch (direction) { + case DMA_MEM_TO_DEV: + desc->lli.saddr = buf_addr + (period_len * period_index); + desc->lli.daddr = sconfig->dst_addr; + desc->lli.ctrla = ctrla; + desc->lli.ctrlb = ATC_DST_ADDR_MODE_FIXED + | ATC_SRC_ADDR_MODE_INCR + | ATC_FC_MEM2PER + | ATC_SIF(atchan->mem_if) + | ATC_DIF(atchan->per_if); + desc->len = period_len; + break; + + case DMA_DEV_TO_MEM: + desc->lli.saddr = sconfig->src_addr; + desc->lli.daddr = buf_addr + (period_len * period_index); + desc->lli.ctrla = ctrla; + desc->lli.ctrlb = ATC_DST_ADDR_MODE_INCR + | ATC_SRC_ADDR_MODE_FIXED + | ATC_FC_PER2MEM + | ATC_SIF(atchan->per_if) + | ATC_DIF(atchan->mem_if); + desc->len = period_len; + break; + + default: + return -EINVAL; + } + + return 0; +} + +/** + * atc_prep_dma_cyclic - prepare the cyclic DMA transfer + * @chan: the DMA channel to prepare + * @buf_addr: physical DMA address where the buffer starts + * @buf_len: total number of bytes for the entire buffer + * @period_len: number of bytes for each period + * @direction: transfer direction, to or from device + * @flags: tx descriptor status flags + */ +static struct dma_async_tx_descriptor * +atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma_slave *atslave = chan->private; + struct dma_slave_config *sconfig = &atchan->dma_sconfig; + struct at_desc *first = NULL; + struct at_desc *prev = NULL; + unsigned long was_cyclic; + unsigned int reg_width; + unsigned int periods = buf_len / period_len; + unsigned int i; + + dev_vdbg(chan2dev(chan), "prep_dma_cyclic: %s buf@0x%08x - %d (%d/%d)\n", + direction == DMA_MEM_TO_DEV ? "TO DEVICE" : "FROM DEVICE", + buf_addr, + periods, buf_len, period_len); + + if (unlikely(!atslave || !buf_len || !period_len)) { + dev_dbg(chan2dev(chan), "prep_dma_cyclic: length is zero!\n"); + return NULL; + } + + was_cyclic = test_and_set_bit(ATC_IS_CYCLIC, &atchan->status); + if (was_cyclic) { + dev_dbg(chan2dev(chan), "prep_dma_cyclic: channel in use!\n"); + return NULL; + } + + if (unlikely(!is_slave_direction(direction))) + goto err_out; + + if (sconfig->direction == DMA_MEM_TO_DEV) + reg_width = convert_buswidth(sconfig->dst_addr_width); + else + reg_width = convert_buswidth(sconfig->src_addr_width); + + /* Check for too big/unaligned periods and unaligned DMA buffer */ + if (atc_dma_cyclic_check_values(reg_width, buf_addr, period_len)) + goto err_out; + + /* build cyclic linked list */ + for (i = 0; i < periods; i++) { + struct at_desc *desc; + + desc = atc_desc_get(atchan); + if (!desc) + goto err_desc_get; + + if (atc_dma_cyclic_fill_desc(chan, desc, i, buf_addr, + reg_width, period_len, direction)) + goto err_desc_get; + + atc_desc_chain(&first, &prev, desc); + } + + /* lets make a cyclic list */ + prev->lli.dscr = first->txd.phys; + + /* First descriptor of the chain embedds additional information */ + first->txd.cookie = -EBUSY; + first->total_len = buf_len; + first->tx_width = reg_width; + + return &first->txd; + +err_desc_get: + dev_err(chan2dev(chan), "not enough descriptors available\n"); + atc_desc_put(atchan, first); +err_out: + clear_bit(ATC_IS_CYCLIC, &atchan->status); + return NULL; +} + +static int atc_config(struct dma_chan *chan, + struct dma_slave_config *sconfig) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + + dev_vdbg(chan2dev(chan), "%s\n", __func__); + + /* Check if it is chan is configured for slave transfers */ + if (!chan->private) + return -EINVAL; + + memcpy(&atchan->dma_sconfig, sconfig, sizeof(*sconfig)); + + convert_burst(&atchan->dma_sconfig.src_maxburst); + convert_burst(&atchan->dma_sconfig.dst_maxburst); + + return 0; +} + +static int atc_pause(struct dma_chan *chan) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma *atdma = to_at_dma(chan->device); + int chan_id = atchan->chan_common.chan_id; + unsigned long flags; + + LIST_HEAD(list); + + dev_vdbg(chan2dev(chan), "%s\n", __func__); + + spin_lock_irqsave(&atchan->lock, flags); + + dma_writel(atdma, CHER, AT_DMA_SUSP(chan_id)); + set_bit(ATC_IS_PAUSED, &atchan->status); + + spin_unlock_irqrestore(&atchan->lock, flags); + + return 0; +} + +static int atc_resume(struct dma_chan *chan) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma *atdma = to_at_dma(chan->device); + int chan_id = atchan->chan_common.chan_id; + unsigned long flags; + + LIST_HEAD(list); + + dev_vdbg(chan2dev(chan), "%s\n", __func__); + + if (!atc_chan_is_paused(atchan)) + return 0; + + spin_lock_irqsave(&atchan->lock, flags); + + dma_writel(atdma, CHDR, AT_DMA_RES(chan_id)); + clear_bit(ATC_IS_PAUSED, &atchan->status); + + spin_unlock_irqrestore(&atchan->lock, flags); + + return 0; +} + +static int atc_terminate_all(struct dma_chan *chan) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma *atdma = to_at_dma(chan->device); + int chan_id = atchan->chan_common.chan_id; + struct at_desc *desc, *_desc; + unsigned long flags; + + LIST_HEAD(list); + + dev_vdbg(chan2dev(chan), "%s\n", __func__); + + /* + * This is only called when something went wrong elsewhere, so + * we don't really care about the data. Just disable the + * channel. We still have to poll the channel enable bit due + * to AHB/HSB limitations. + */ + spin_lock_irqsave(&atchan->lock, flags); + + /* disabling channel: must also remove suspend state */ + dma_writel(atdma, CHDR, AT_DMA_RES(chan_id) | atchan->mask); + + /* confirm that this channel is disabled */ + while (dma_readl(atdma, CHSR) & atchan->mask) + cpu_relax(); + + /* active_list entries will end up before queued entries */ + list_splice_init(&atchan->queue, &list); + list_splice_init(&atchan->active_list, &list); + + /* Flush all pending and queued descriptors */ + list_for_each_entry_safe(desc, _desc, &list, desc_node) + atc_chain_complete(atchan, desc); + + clear_bit(ATC_IS_PAUSED, &atchan->status); + /* if channel dedicated to cyclic operations, free it */ + clear_bit(ATC_IS_CYCLIC, &atchan->status); + + spin_unlock_irqrestore(&atchan->lock, flags); + + return 0; +} + +/** + * atc_tx_status - poll for transaction completion + * @chan: DMA channel + * @cookie: transaction identifier to check status of + * @txstate: if not %NULL updated with transaction state + * + * If @txstate is passed in, upon return it reflect the driver + * internal state and can be used with dma_async_is_complete() to check + * the status of multiple cookies without re-checking hardware state. + */ +static enum dma_status +atc_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + unsigned long flags; + enum dma_status ret; + int bytes = 0; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + /* + * There's no point calculating the residue if there's + * no txstate to store the value. + */ + if (!txstate) + return DMA_ERROR; + + spin_lock_irqsave(&atchan->lock, flags); + + /* Get number of bytes left in the active transactions */ + bytes = atc_get_bytes_left(chan, cookie); + + spin_unlock_irqrestore(&atchan->lock, flags); + + if (unlikely(bytes < 0)) { + dev_vdbg(chan2dev(chan), "get residual bytes error\n"); + return DMA_ERROR; + } else { + dma_set_residue(txstate, bytes); + } + + dev_vdbg(chan2dev(chan), "tx_status %d: cookie = %d residue = %d\n", + ret, cookie, bytes); + + return ret; +} + +/** + * atc_issue_pending - try to finish work + * @chan: target DMA channel + */ +static void atc_issue_pending(struct dma_chan *chan) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + unsigned long flags; + + dev_vdbg(chan2dev(chan), "issue_pending\n"); + + /* Not needed for cyclic transfers */ + if (atc_chan_is_cyclic(atchan)) + return; + + spin_lock_irqsave(&atchan->lock, flags); + atc_advance_work(atchan); + spin_unlock_irqrestore(&atchan->lock, flags); +} + +/** + * atc_alloc_chan_resources - allocate resources for DMA channel + * @chan: allocate descriptor resources for this channel + * @client: current client requesting the channel be ready for requests + * + * return - the number of allocated descriptors + */ +static int atc_alloc_chan_resources(struct dma_chan *chan) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma *atdma = to_at_dma(chan->device); + struct at_desc *desc; + struct at_dma_slave *atslave; + unsigned long flags; + int i; + u32 cfg; + LIST_HEAD(tmp_list); + + dev_vdbg(chan2dev(chan), "alloc_chan_resources\n"); + + /* ASSERT: channel is idle */ + if (atc_chan_is_enabled(atchan)) { + dev_dbg(chan2dev(chan), "DMA channel not idle ?\n"); + return -EIO; + } + + cfg = ATC_DEFAULT_CFG; + + atslave = chan->private; + if (atslave) { + /* + * We need controller-specific data to set up slave + * transfers. + */ + BUG_ON(!atslave->dma_dev || atslave->dma_dev != atdma->dma_common.dev); + + /* if cfg configuration specified take it instead of default */ + if (atslave->cfg) + cfg = atslave->cfg; + } + + /* have we already been set up? + * reconfigure channel but no need to reallocate descriptors */ + if (!list_empty(&atchan->free_list)) + return atchan->descs_allocated; + + /* Allocate initial pool of descriptors */ + for (i = 0; i < init_nr_desc_per_channel; i++) { + desc = atc_alloc_descriptor(chan, GFP_KERNEL); + if (!desc) { + dev_err(atdma->dma_common.dev, + "Only %d initial descriptors\n", i); + break; + } + list_add_tail(&desc->desc_node, &tmp_list); + } + + spin_lock_irqsave(&atchan->lock, flags); + atchan->descs_allocated = i; + list_splice(&tmp_list, &atchan->free_list); + dma_cookie_init(chan); + spin_unlock_irqrestore(&atchan->lock, flags); + + /* channel parameters */ + channel_writel(atchan, CFG, cfg); + + dev_dbg(chan2dev(chan), + "alloc_chan_resources: allocated %d descriptors\n", + atchan->descs_allocated); + + return atchan->descs_allocated; +} + +/** + * atc_free_chan_resources - free all channel resources + * @chan: DMA channel + */ +static void atc_free_chan_resources(struct dma_chan *chan) +{ + struct at_dma_chan *atchan = to_at_dma_chan(chan); + struct at_dma *atdma = to_at_dma(chan->device); + struct at_desc *desc, *_desc; + LIST_HEAD(list); + + dev_dbg(chan2dev(chan), "free_chan_resources: (descs allocated=%u)\n", + atchan->descs_allocated); + + /* ASSERT: channel is idle */ + BUG_ON(!list_empty(&atchan->active_list)); + BUG_ON(!list_empty(&atchan->queue)); + BUG_ON(atc_chan_is_enabled(atchan)); + + list_for_each_entry_safe(desc, _desc, &atchan->free_list, desc_node) { + dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); + list_del(&desc->desc_node); + /* free link descriptor */ + dma_pool_free(atdma->dma_desc_pool, desc, desc->txd.phys); + } + list_splice_init(&atchan->free_list, &list); + atchan->descs_allocated = 0; + atchan->status = 0; + + dev_vdbg(chan2dev(chan), "free_chan_resources: done\n"); +} + +#ifdef CONFIG_OF +static bool at_dma_filter(struct dma_chan *chan, void *slave) +{ + struct at_dma_slave *atslave = slave; + + if (atslave->dma_dev == chan->device->dev) { + chan->private = atslave; + return true; + } else { + return false; + } +} + +static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *of_dma) +{ + struct dma_chan *chan; + struct at_dma_chan *atchan; + struct at_dma_slave *atslave; + dma_cap_mask_t mask; + unsigned int per_id; + struct platform_device *dmac_pdev; + + if (dma_spec->args_count != 2) + return NULL; + + dmac_pdev = of_find_device_by_node(dma_spec->np); + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + atslave = devm_kzalloc(&dmac_pdev->dev, sizeof(*atslave), GFP_KERNEL); + if (!atslave) + return NULL; + + atslave->cfg = ATC_DST_H2SEL_HW | ATC_SRC_H2SEL_HW; + /* + * We can fill both SRC_PER and DST_PER, one of these fields will be + * ignored depending on DMA transfer direction. + */ + per_id = dma_spec->args[1] & AT91_DMA_CFG_PER_ID_MASK; + atslave->cfg |= ATC_DST_PER_MSB(per_id) | ATC_DST_PER(per_id) + | ATC_SRC_PER_MSB(per_id) | ATC_SRC_PER(per_id); + /* + * We have to translate the value we get from the device tree since + * the half FIFO configuration value had to be 0 to keep backward + * compatibility. + */ + switch (dma_spec->args[1] & AT91_DMA_CFG_FIFOCFG_MASK) { + case AT91_DMA_CFG_FIFOCFG_ALAP: + atslave->cfg |= ATC_FIFOCFG_LARGESTBURST; + break; + case AT91_DMA_CFG_FIFOCFG_ASAP: + atslave->cfg |= ATC_FIFOCFG_ENOUGHSPACE; + break; + case AT91_DMA_CFG_FIFOCFG_HALF: + default: + atslave->cfg |= ATC_FIFOCFG_HALFFIFO; + } + atslave->dma_dev = &dmac_pdev->dev; + + chan = dma_request_channel(mask, at_dma_filter, atslave); + if (!chan) + return NULL; + + atchan = to_at_dma_chan(chan); + atchan->per_if = dma_spec->args[0] & 0xff; + atchan->mem_if = (dma_spec->args[0] >> 16) & 0xff; + + return chan; +} +#else +static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *of_dma) +{ + return NULL; +} +#endif + +/*-- Module Management -----------------------------------------------*/ + +/* cap_mask is a multi-u32 bitfield, fill it with proper C code. */ +static struct at_dma_platform_data at91sam9rl_config = { + .nr_channels = 2, +}; +static struct at_dma_platform_data at91sam9g45_config = { + .nr_channels = 8, +}; + +#if defined(CONFIG_OF) +static const struct of_device_id atmel_dma_dt_ids[] = { + { + .compatible = "atmel,at91sam9rl-dma", + .data = &at91sam9rl_config, + }, { + .compatible = "atmel,at91sam9g45-dma", + .data = &at91sam9g45_config, + }, { + /* sentinel */ + } +}; + +MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids); +#endif + +static const struct platform_device_id atdma_devtypes[] = { + { + .name = "at91sam9rl_dma", + .driver_data = (unsigned long) &at91sam9rl_config, + }, { + .name = "at91sam9g45_dma", + .driver_data = (unsigned long) &at91sam9g45_config, + }, { + /* sentinel */ + } +}; + +static inline const struct at_dma_platform_data * __init at_dma_get_driver_data( + struct platform_device *pdev) +{ + if (pdev->dev.of_node) { + const struct of_device_id *match; + match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node); + if (match == NULL) + return NULL; + return match->data; + } + return (struct at_dma_platform_data *) + platform_get_device_id(pdev)->driver_data; +} + +/** + * at_dma_off - disable DMA controller + * @atdma: the Atmel HDAMC device + */ +static void at_dma_off(struct at_dma *atdma) +{ + dma_writel(atdma, EN, 0); + + /* disable all interrupts */ + dma_writel(atdma, EBCIDR, -1L); + + /* confirm that all channels are disabled */ + while (dma_readl(atdma, CHSR) & atdma->all_chan_mask) + cpu_relax(); +} + +static int __init at_dma_probe(struct platform_device *pdev) +{ + struct resource *io; + struct at_dma *atdma; + size_t size; + int irq; + int err; + int i; + const struct at_dma_platform_data *plat_dat; + + /* setup platform data for each SoC */ + dma_cap_set(DMA_MEMCPY, at91sam9rl_config.cap_mask); + dma_cap_set(DMA_SG, at91sam9rl_config.cap_mask); + dma_cap_set(DMA_MEMCPY, at91sam9g45_config.cap_mask); + dma_cap_set(DMA_SLAVE, at91sam9g45_config.cap_mask); + dma_cap_set(DMA_SG, at91sam9g45_config.cap_mask); + + /* get DMA parameters from controller type */ + plat_dat = at_dma_get_driver_data(pdev); + if (!plat_dat) + return -ENODEV; + + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!io) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + size = sizeof(struct at_dma); + size += plat_dat->nr_channels * sizeof(struct at_dma_chan); + atdma = kzalloc(size, GFP_KERNEL); + if (!atdma) + return -ENOMEM; + + /* discover transaction capabilities */ + atdma->dma_common.cap_mask = plat_dat->cap_mask; + atdma->all_chan_mask = (1 << plat_dat->nr_channels) - 1; + + size = resource_size(io); + if (!request_mem_region(io->start, size, pdev->dev.driver->name)) { + err = -EBUSY; + goto err_kfree; + } + + atdma->regs = ioremap(io->start, size); + if (!atdma->regs) { + err = -ENOMEM; + goto err_release_r; + } + + atdma->clk = clk_get(&pdev->dev, "dma_clk"); + if (IS_ERR(atdma->clk)) { + err = PTR_ERR(atdma->clk); + goto err_clk; + } + err = clk_prepare_enable(atdma->clk); + if (err) + goto err_clk_prepare; + + /* force dma off, just in case */ + at_dma_off(atdma); + + err = request_irq(irq, at_dma_interrupt, 0, "at_hdmac", atdma); + if (err) + goto err_irq; + + platform_set_drvdata(pdev, atdma); + + /* create a pool of consistent memory blocks for hardware descriptors */ + atdma->dma_desc_pool = dma_pool_create("at_hdmac_desc_pool", + &pdev->dev, sizeof(struct at_desc), + 4 /* word alignment */, 0); + if (!atdma->dma_desc_pool) { + dev_err(&pdev->dev, "No memory for descriptors dma pool\n"); + err = -ENOMEM; + goto err_pool_create; + } + + /* clear any pending interrupt */ + while (dma_readl(atdma, EBCISR)) + cpu_relax(); + + /* initialize channels related values */ + INIT_LIST_HEAD(&atdma->dma_common.channels); + for (i = 0; i < plat_dat->nr_channels; i++) { + struct at_dma_chan *atchan = &atdma->chan[i]; + + atchan->mem_if = AT_DMA_MEM_IF; + atchan->per_if = AT_DMA_PER_IF; + atchan->chan_common.device = &atdma->dma_common; + dma_cookie_init(&atchan->chan_common); + list_add_tail(&atchan->chan_common.device_node, + &atdma->dma_common.channels); + + atchan->ch_regs = atdma->regs + ch_regs(i); + spin_lock_init(&atchan->lock); + atchan->mask = 1 << i; + + INIT_LIST_HEAD(&atchan->active_list); + INIT_LIST_HEAD(&atchan->queue); + INIT_LIST_HEAD(&atchan->free_list); + + tasklet_init(&atchan->tasklet, atc_tasklet, + (unsigned long)atchan); + atc_enable_chan_irq(atdma, i); + } + + /* set base routines */ + atdma->dma_common.device_alloc_chan_resources = atc_alloc_chan_resources; + atdma->dma_common.device_free_chan_resources = atc_free_chan_resources; + atdma->dma_common.device_tx_status = atc_tx_status; + atdma->dma_common.device_issue_pending = atc_issue_pending; + atdma->dma_common.dev = &pdev->dev; + + /* set prep routines based on capability */ + if (dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask)) + atdma->dma_common.device_prep_dma_memcpy = atc_prep_dma_memcpy; + + if (dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask)) { + atdma->dma_common.device_prep_slave_sg = atc_prep_slave_sg; + /* controller can do slave DMA: can trigger cyclic transfers */ + dma_cap_set(DMA_CYCLIC, atdma->dma_common.cap_mask); + atdma->dma_common.device_prep_dma_cyclic = atc_prep_dma_cyclic; + atdma->dma_common.device_config = atc_config; + atdma->dma_common.device_pause = atc_pause; + atdma->dma_common.device_resume = atc_resume; + atdma->dma_common.device_terminate_all = atc_terminate_all; + atdma->dma_common.src_addr_widths = ATC_DMA_BUSWIDTHS; + atdma->dma_common.dst_addr_widths = ATC_DMA_BUSWIDTHS; + atdma->dma_common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + atdma->dma_common.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + } + + if (dma_has_cap(DMA_SG, atdma->dma_common.cap_mask)) + atdma->dma_common.device_prep_dma_sg = atc_prep_dma_sg; + + dma_writel(atdma, EN, AT_DMA_ENABLE); + + dev_info(&pdev->dev, "Atmel AHB DMA Controller ( %s%s%s), %d channels\n", + dma_has_cap(DMA_MEMCPY, atdma->dma_common.cap_mask) ? "cpy " : "", + dma_has_cap(DMA_SLAVE, atdma->dma_common.cap_mask) ? "slave " : "", + dma_has_cap(DMA_SG, atdma->dma_common.cap_mask) ? "sg-cpy " : "", + plat_dat->nr_channels); + + dma_async_device_register(&atdma->dma_common); + + /* + * Do not return an error if the dmac node is not present in order to + * not break the existing way of requesting channel with + * dma_request_channel(). + */ + if (pdev->dev.of_node) { + err = of_dma_controller_register(pdev->dev.of_node, + at_dma_xlate, atdma); + if (err) { + dev_err(&pdev->dev, "could not register of_dma_controller\n"); + goto err_of_dma_controller_register; + } + } + + return 0; + +err_of_dma_controller_register: + dma_async_device_unregister(&atdma->dma_common); + dma_pool_destroy(atdma->dma_desc_pool); +err_pool_create: + free_irq(platform_get_irq(pdev, 0), atdma); +err_irq: + clk_disable_unprepare(atdma->clk); +err_clk_prepare: + clk_put(atdma->clk); +err_clk: + iounmap(atdma->regs); + atdma->regs = NULL; +err_release_r: + release_mem_region(io->start, size); +err_kfree: + kfree(atdma); + return err; +} + +static int at_dma_remove(struct platform_device *pdev) +{ + struct at_dma *atdma = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + struct resource *io; + + at_dma_off(atdma); + dma_async_device_unregister(&atdma->dma_common); + + dma_pool_destroy(atdma->dma_desc_pool); + free_irq(platform_get_irq(pdev, 0), atdma); + + list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, + device_node) { + struct at_dma_chan *atchan = to_at_dma_chan(chan); + + /* Disable interrupts */ + atc_disable_chan_irq(atdma, chan->chan_id); + + tasklet_kill(&atchan->tasklet); + list_del(&chan->device_node); + } + + clk_disable_unprepare(atdma->clk); + clk_put(atdma->clk); + + iounmap(atdma->regs); + atdma->regs = NULL; + + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + release_mem_region(io->start, resource_size(io)); + + kfree(atdma); + + return 0; +} + +static void at_dma_shutdown(struct platform_device *pdev) +{ + struct at_dma *atdma = platform_get_drvdata(pdev); + + at_dma_off(platform_get_drvdata(pdev)); + clk_disable_unprepare(atdma->clk); +} + +static int at_dma_prepare(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_dma *atdma = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + + list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, + device_node) { + struct at_dma_chan *atchan = to_at_dma_chan(chan); + /* wait for transaction completion (except in cyclic case) */ + if (atc_chan_is_enabled(atchan) && !atc_chan_is_cyclic(atchan)) + return -EAGAIN; + } + return 0; +} + +static void atc_suspend_cyclic(struct at_dma_chan *atchan) +{ + struct dma_chan *chan = &atchan->chan_common; + + /* Channel should be paused by user + * do it anyway even if it is not done already */ + if (!atc_chan_is_paused(atchan)) { + dev_warn(chan2dev(chan), + "cyclic channel not paused, should be done by channel user\n"); + atc_pause(chan); + } + + /* now preserve additional data for cyclic operations */ + /* next descriptor address in the cyclic list */ + atchan->save_dscr = channel_readl(atchan, DSCR); + + vdbg_dump_regs(atchan); +} + +static int at_dma_suspend_noirq(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_dma *atdma = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + + /* preserve data */ + list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, + device_node) { + struct at_dma_chan *atchan = to_at_dma_chan(chan); + + if (atc_chan_is_cyclic(atchan)) + atc_suspend_cyclic(atchan); + atchan->save_cfg = channel_readl(atchan, CFG); + } + atdma->save_imr = dma_readl(atdma, EBCIMR); + + /* disable DMA controller */ + at_dma_off(atdma); + clk_disable_unprepare(atdma->clk); + return 0; +} + +static void atc_resume_cyclic(struct at_dma_chan *atchan) +{ + struct at_dma *atdma = to_at_dma(atchan->chan_common.device); + + /* restore channel status for cyclic descriptors list: + * next descriptor in the cyclic list at the time of suspend */ + channel_writel(atchan, SADDR, 0); + channel_writel(atchan, DADDR, 0); + channel_writel(atchan, CTRLA, 0); + channel_writel(atchan, CTRLB, 0); + channel_writel(atchan, DSCR, atchan->save_dscr); + dma_writel(atdma, CHER, atchan->mask); + + /* channel pause status should be removed by channel user + * We cannot take the initiative to do it here */ + + vdbg_dump_regs(atchan); +} + +static int at_dma_resume_noirq(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_dma *atdma = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + + /* bring back DMA controller */ + clk_prepare_enable(atdma->clk); + dma_writel(atdma, EN, AT_DMA_ENABLE); + + /* clear any pending interrupt */ + while (dma_readl(atdma, EBCISR)) + cpu_relax(); + + /* restore saved data */ + dma_writel(atdma, EBCIER, atdma->save_imr); + list_for_each_entry_safe(chan, _chan, &atdma->dma_common.channels, + device_node) { + struct at_dma_chan *atchan = to_at_dma_chan(chan); + + channel_writel(atchan, CFG, atchan->save_cfg); + if (atc_chan_is_cyclic(atchan)) + atc_resume_cyclic(atchan); + } + return 0; +} + +static const struct dev_pm_ops at_dma_dev_pm_ops = { + .prepare = at_dma_prepare, + .suspend_noirq = at_dma_suspend_noirq, + .resume_noirq = at_dma_resume_noirq, +}; + +static struct platform_driver at_dma_driver = { + .remove = at_dma_remove, + .shutdown = at_dma_shutdown, + .id_table = atdma_devtypes, + .driver = { + .name = "at_hdmac", + .pm = &at_dma_dev_pm_ops, + .of_match_table = of_match_ptr(atmel_dma_dt_ids), + }, +}; + +static int __init at_dma_init(void) +{ + return platform_driver_probe(&at_dma_driver, at_dma_probe); +} +subsys_initcall(at_dma_init); + +static void __exit at_dma_exit(void) +{ + platform_driver_unregister(&at_dma_driver); +} +module_exit(at_dma_exit); + +MODULE_DESCRIPTION("Atmel AHB DMA Controller driver"); +MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:at_hdmac"); diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h new file mode 100644 index 000000000..2727ca560 --- /dev/null +++ b/drivers/dma/at_hdmac_regs.h @@ -0,0 +1,452 @@ +/* + * Header file for the Atmel AHB DMA Controller driver + * + * Copyright (C) 2008 Atmel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ +#ifndef AT_HDMAC_REGS_H +#define AT_HDMAC_REGS_H + +#include <linux/platform_data/dma-atmel.h> + +#define AT_DMA_MAX_NR_CHANNELS 8 + + +#define AT_DMA_GCFG 0x00 /* Global Configuration Register */ +#define AT_DMA_IF_BIGEND(i) (0x1 << (i)) /* AHB-Lite Interface i in Big-endian mode */ +#define AT_DMA_ARB_CFG (0x1 << 4) /* Arbiter mode. */ +#define AT_DMA_ARB_CFG_FIXED (0x0 << 4) +#define AT_DMA_ARB_CFG_ROUND_ROBIN (0x1 << 4) + +#define AT_DMA_EN 0x04 /* Controller Enable Register */ +#define AT_DMA_ENABLE (0x1 << 0) + +#define AT_DMA_SREQ 0x08 /* Software Single Request Register */ +#define AT_DMA_SSREQ(x) (0x1 << ((x) << 1)) /* Request a source single transfer on channel x */ +#define AT_DMA_DSREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination single transfer on channel x */ + +#define AT_DMA_CREQ 0x0C /* Software Chunk Transfer Request Register */ +#define AT_DMA_SCREQ(x) (0x1 << ((x) << 1)) /* Request a source chunk transfer on channel x */ +#define AT_DMA_DCREQ(x) (0x1 << (1 + ((x) << 1))) /* Request a destination chunk transfer on channel x */ + +#define AT_DMA_LAST 0x10 /* Software Last Transfer Flag Register */ +#define AT_DMA_SLAST(x) (0x1 << ((x) << 1)) /* This src rq is last tx of buffer on channel x */ +#define AT_DMA_DLAST(x) (0x1 << (1 + ((x) << 1))) /* This dst rq is last tx of buffer on channel x */ + +#define AT_DMA_SYNC 0x14 /* Request Synchronization Register */ +#define AT_DMA_SYR(h) (0x1 << (h)) /* Synchronize handshake line h */ + +/* Error, Chained Buffer transfer completed and Buffer transfer completed Interrupt registers */ +#define AT_DMA_EBCIER 0x18 /* Enable register */ +#define AT_DMA_EBCIDR 0x1C /* Disable register */ +#define AT_DMA_EBCIMR 0x20 /* Mask Register */ +#define AT_DMA_EBCISR 0x24 /* Status Register */ +#define AT_DMA_CBTC_OFFSET 8 +#define AT_DMA_ERR_OFFSET 16 +#define AT_DMA_BTC(x) (0x1 << (x)) +#define AT_DMA_CBTC(x) (0x1 << (AT_DMA_CBTC_OFFSET + (x))) +#define AT_DMA_ERR(x) (0x1 << (AT_DMA_ERR_OFFSET + (x))) + +#define AT_DMA_CHER 0x28 /* Channel Handler Enable Register */ +#define AT_DMA_ENA(x) (0x1 << (x)) +#define AT_DMA_SUSP(x) (0x1 << ( 8 + (x))) +#define AT_DMA_KEEP(x) (0x1 << (24 + (x))) + +#define AT_DMA_CHDR 0x2C /* Channel Handler Disable Register */ +#define AT_DMA_DIS(x) (0x1 << (x)) +#define AT_DMA_RES(x) (0x1 << ( 8 + (x))) + +#define AT_DMA_CHSR 0x30 /* Channel Handler Status Register */ +#define AT_DMA_EMPT(x) (0x1 << (16 + (x))) +#define AT_DMA_STAL(x) (0x1 << (24 + (x))) + + +#define AT_DMA_CH_REGS_BASE 0x3C /* Channel registers base address */ +#define ch_regs(x) (AT_DMA_CH_REGS_BASE + (x) * 0x28) /* Channel x base addr */ + +/* Hardware register offset for each channel */ +#define ATC_SADDR_OFFSET 0x00 /* Source Address Register */ +#define ATC_DADDR_OFFSET 0x04 /* Destination Address Register */ +#define ATC_DSCR_OFFSET 0x08 /* Descriptor Address Register */ +#define ATC_CTRLA_OFFSET 0x0C /* Control A Register */ +#define ATC_CTRLB_OFFSET 0x10 /* Control B Register */ +#define ATC_CFG_OFFSET 0x14 /* Configuration Register */ +#define ATC_SPIP_OFFSET 0x18 /* Src PIP Configuration Register */ +#define ATC_DPIP_OFFSET 0x1C /* Dst PIP Configuration Register */ + + +/* Bitfield definitions */ + +/* Bitfields in DSCR */ +#define ATC_DSCR_IF(i) (0x3 & (i)) /* Dsc feched via AHB-Lite Interface i */ + +/* Bitfields in CTRLA */ +#define ATC_BTSIZE_MAX 0xFFFFUL /* Maximum Buffer Transfer Size */ +#define ATC_BTSIZE(x) (ATC_BTSIZE_MAX & (x)) /* Buffer Transfer Size */ +#define ATC_SCSIZE_MASK (0x7 << 16) /* Source Chunk Transfer Size */ +#define ATC_SCSIZE(x) (ATC_SCSIZE_MASK & ((x) << 16)) +#define ATC_SCSIZE_1 (0x0 << 16) +#define ATC_SCSIZE_4 (0x1 << 16) +#define ATC_SCSIZE_8 (0x2 << 16) +#define ATC_SCSIZE_16 (0x3 << 16) +#define ATC_SCSIZE_32 (0x4 << 16) +#define ATC_SCSIZE_64 (0x5 << 16) +#define ATC_SCSIZE_128 (0x6 << 16) +#define ATC_SCSIZE_256 (0x7 << 16) +#define ATC_DCSIZE_MASK (0x7 << 20) /* Destination Chunk Transfer Size */ +#define ATC_DCSIZE(x) (ATC_DCSIZE_MASK & ((x) << 20)) +#define ATC_DCSIZE_1 (0x0 << 20) +#define ATC_DCSIZE_4 (0x1 << 20) +#define ATC_DCSIZE_8 (0x2 << 20) +#define ATC_DCSIZE_16 (0x3 << 20) +#define ATC_DCSIZE_32 (0x4 << 20) +#define ATC_DCSIZE_64 (0x5 << 20) +#define ATC_DCSIZE_128 (0x6 << 20) +#define ATC_DCSIZE_256 (0x7 << 20) +#define ATC_SRC_WIDTH_MASK (0x3 << 24) /* Source Single Transfer Size */ +#define ATC_SRC_WIDTH(x) ((x) << 24) +#define ATC_SRC_WIDTH_BYTE (0x0 << 24) +#define ATC_SRC_WIDTH_HALFWORD (0x1 << 24) +#define ATC_SRC_WIDTH_WORD (0x2 << 24) +#define ATC_DST_WIDTH_MASK (0x3 << 28) /* Destination Single Transfer Size */ +#define ATC_DST_WIDTH(x) ((x) << 28) +#define ATC_DST_WIDTH_BYTE (0x0 << 28) +#define ATC_DST_WIDTH_HALFWORD (0x1 << 28) +#define ATC_DST_WIDTH_WORD (0x2 << 28) +#define ATC_DONE (0x1 << 31) /* Tx Done (only written back in descriptor) */ + +/* Bitfields in CTRLB */ +#define ATC_SIF(i) (0x3 & (i)) /* Src tx done via AHB-Lite Interface i */ +#define ATC_DIF(i) ((0x3 & (i)) << 4) /* Dst tx done via AHB-Lite Interface i */ + /* Specify AHB interfaces */ +#define AT_DMA_MEM_IF 0 /* interface 0 as memory interface */ +#define AT_DMA_PER_IF 1 /* interface 1 as peripheral interface */ + +#define ATC_SRC_PIP (0x1 << 8) /* Source Picture-in-Picture enabled */ +#define ATC_DST_PIP (0x1 << 12) /* Destination Picture-in-Picture enabled */ +#define ATC_SRC_DSCR_DIS (0x1 << 16) /* Src Descriptor fetch disable */ +#define ATC_DST_DSCR_DIS (0x1 << 20) /* Dst Descriptor fetch disable */ +#define ATC_FC_MASK (0x7 << 21) /* Choose Flow Controller */ +#define ATC_FC_MEM2MEM (0x0 << 21) /* Mem-to-Mem (DMA) */ +#define ATC_FC_MEM2PER (0x1 << 21) /* Mem-to-Periph (DMA) */ +#define ATC_FC_PER2MEM (0x2 << 21) /* Periph-to-Mem (DMA) */ +#define ATC_FC_PER2PER (0x3 << 21) /* Periph-to-Periph (DMA) */ +#define ATC_FC_PER2MEM_PER (0x4 << 21) /* Periph-to-Mem (Peripheral) */ +#define ATC_FC_MEM2PER_PER (0x5 << 21) /* Mem-to-Periph (Peripheral) */ +#define ATC_FC_PER2PER_SRCPER (0x6 << 21) /* Periph-to-Periph (Src Peripheral) */ +#define ATC_FC_PER2PER_DSTPER (0x7 << 21) /* Periph-to-Periph (Dst Peripheral) */ +#define ATC_SRC_ADDR_MODE_MASK (0x3 << 24) +#define ATC_SRC_ADDR_MODE_INCR (0x0 << 24) /* Incrementing Mode */ +#define ATC_SRC_ADDR_MODE_DECR (0x1 << 24) /* Decrementing Mode */ +#define ATC_SRC_ADDR_MODE_FIXED (0x2 << 24) /* Fixed Mode */ +#define ATC_DST_ADDR_MODE_MASK (0x3 << 28) +#define ATC_DST_ADDR_MODE_INCR (0x0 << 28) /* Incrementing Mode */ +#define ATC_DST_ADDR_MODE_DECR (0x1 << 28) /* Decrementing Mode */ +#define ATC_DST_ADDR_MODE_FIXED (0x2 << 28) /* Fixed Mode */ +#define ATC_IEN (0x1 << 30) /* BTC interrupt enable (active low) */ +#define ATC_AUTO (0x1 << 31) /* Auto multiple buffer tx enable */ + +/* Bitfields in CFG */ +/* are in at_hdmac.h */ + +/* Bitfields in SPIP */ +#define ATC_SPIP_HOLE(x) (0xFFFFU & (x)) +#define ATC_SPIP_BOUNDARY(x) ((0x3FF & (x)) << 16) + +/* Bitfields in DPIP */ +#define ATC_DPIP_HOLE(x) (0xFFFFU & (x)) +#define ATC_DPIP_BOUNDARY(x) ((0x3FF & (x)) << 16) + + +/*-- descriptors -----------------------------------------------------*/ + +/* LLI == Linked List Item; aka DMA buffer descriptor */ +struct at_lli { + /* values that are not changed by hardware */ + dma_addr_t saddr; + dma_addr_t daddr; + /* value that may get written back: */ + u32 ctrla; + /* more values that are not changed by hardware */ + u32 ctrlb; + dma_addr_t dscr; /* chain to next lli */ +}; + +/** + * struct at_desc - software descriptor + * @at_lli: hardware lli structure + * @txd: support for the async_tx api + * @desc_node: node on the channed descriptors list + * @len: descriptor byte count + * @tx_width: transfer width + * @total_len: total transaction byte count + */ +struct at_desc { + /* FIRST values the hardware uses */ + struct at_lli lli; + + /* THEN values for driver housekeeping */ + struct list_head tx_list; + struct dma_async_tx_descriptor txd; + struct list_head desc_node; + size_t len; + u32 tx_width; + size_t total_len; +}; + +static inline struct at_desc * +txd_to_at_desc(struct dma_async_tx_descriptor *txd) +{ + return container_of(txd, struct at_desc, txd); +} + + +/*-- Channels --------------------------------------------------------*/ + +/** + * atc_status - information bits stored in channel status flag + * + * Manipulated with atomic operations. + */ +enum atc_status { + ATC_IS_ERROR = 0, + ATC_IS_PAUSED = 1, + ATC_IS_CYCLIC = 24, +}; + +/** + * struct at_dma_chan - internal representation of an Atmel HDMAC channel + * @chan_common: common dmaengine channel object members + * @device: parent device + * @ch_regs: memory mapped register base + * @mask: channel index in a mask + * @per_if: peripheral interface + * @mem_if: memory interface + * @status: transmit status information from irq/prep* functions + * to tasklet (use atomic operations) + * @tasklet: bottom half to finish transaction work + * @save_cfg: configuration register that is saved on suspend/resume cycle + * @save_dscr: for cyclic operations, preserve next descriptor address in + * the cyclic list on suspend/resume cycle + * @dma_sconfig: configuration for slave transfers, passed via + * .device_config + * @lock: serializes enqueue/dequeue operations to descriptors lists + * @active_list: list of descriptors dmaengine is being running on + * @queue: list of descriptors ready to be submitted to engine + * @free_list: list of descriptors usable by the channel + * @descs_allocated: records the actual size of the descriptor pool + */ +struct at_dma_chan { + struct dma_chan chan_common; + struct at_dma *device; + void __iomem *ch_regs; + u8 mask; + u8 per_if; + u8 mem_if; + unsigned long status; + struct tasklet_struct tasklet; + u32 save_cfg; + u32 save_dscr; + struct dma_slave_config dma_sconfig; + + spinlock_t lock; + + /* these other elements are all protected by lock */ + struct list_head active_list; + struct list_head queue; + struct list_head free_list; + unsigned int descs_allocated; +}; + +#define channel_readl(atchan, name) \ + __raw_readl((atchan)->ch_regs + ATC_##name##_OFFSET) + +#define channel_writel(atchan, name, val) \ + __raw_writel((val), (atchan)->ch_regs + ATC_##name##_OFFSET) + +static inline struct at_dma_chan *to_at_dma_chan(struct dma_chan *dchan) +{ + return container_of(dchan, struct at_dma_chan, chan_common); +} + +/* + * Fix sconfig's burst size according to at_hdmac. We need to convert them as: + * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3, 32 -> 4, 64 -> 5, 128 -> 6, 256 -> 7. + * + * This can be done by finding most significant bit set. + */ +static inline void convert_burst(u32 *maxburst) +{ + if (*maxburst > 1) + *maxburst = fls(*maxburst) - 2; + else + *maxburst = 0; +} + +/* + * Fix sconfig's bus width according to at_hdmac. + * 1 byte -> 0, 2 bytes -> 1, 4 bytes -> 2. + */ +static inline u8 convert_buswidth(enum dma_slave_buswidth addr_width) +{ + switch (addr_width) { + case DMA_SLAVE_BUSWIDTH_2_BYTES: + return 1; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + return 2; + default: + /* For 1 byte width or fallback */ + return 0; + } +} + +/*-- Controller ------------------------------------------------------*/ + +/** + * struct at_dma - internal representation of an Atmel HDMA Controller + * @chan_common: common dmaengine dma_device object members + * @atdma_devtype: identifier of DMA controller compatibility + * @ch_regs: memory mapped register base + * @clk: dma controller clock + * @save_imr: interrupt mask register that is saved on suspend/resume cycle + * @all_chan_mask: all channels availlable in a mask + * @dma_desc_pool: base of DMA descriptor region (DMA address) + * @chan: channels table to store at_dma_chan structures + */ +struct at_dma { + struct dma_device dma_common; + void __iomem *regs; + struct clk *clk; + u32 save_imr; + + u8 all_chan_mask; + + struct dma_pool *dma_desc_pool; + /* AT THE END channels table */ + struct at_dma_chan chan[0]; +}; + +#define dma_readl(atdma, name) \ + __raw_readl((atdma)->regs + AT_DMA_##name) +#define dma_writel(atdma, name, val) \ + __raw_writel((val), (atdma)->regs + AT_DMA_##name) + +static inline struct at_dma *to_at_dma(struct dma_device *ddev) +{ + return container_of(ddev, struct at_dma, dma_common); +} + + +/*-- Helper functions ------------------------------------------------*/ + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} + +#if defined(VERBOSE_DEBUG) +static void vdbg_dump_regs(struct at_dma_chan *atchan) +{ + struct at_dma *atdma = to_at_dma(atchan->chan_common.device); + + dev_err(chan2dev(&atchan->chan_common), + " channel %d : imr = 0x%x, chsr = 0x%x\n", + atchan->chan_common.chan_id, + dma_readl(atdma, EBCIMR), + dma_readl(atdma, CHSR)); + + dev_err(chan2dev(&atchan->chan_common), + " channel: s0x%x d0x%x ctrl0x%x:0x%x cfg0x%x l0x%x\n", + channel_readl(atchan, SADDR), + channel_readl(atchan, DADDR), + channel_readl(atchan, CTRLA), + channel_readl(atchan, CTRLB), + channel_readl(atchan, CFG), + channel_readl(atchan, DSCR)); +} +#else +static void vdbg_dump_regs(struct at_dma_chan *atchan) {} +#endif + +static void atc_dump_lli(struct at_dma_chan *atchan, struct at_lli *lli) +{ + dev_crit(chan2dev(&atchan->chan_common), + " desc: s0x%x d0x%x ctrl0x%x:0x%x l0x%x\n", + lli->saddr, lli->daddr, + lli->ctrla, lli->ctrlb, lli->dscr); +} + + +static void atc_setup_irq(struct at_dma *atdma, int chan_id, int on) +{ + u32 ebci; + + /* enable interrupts on buffer transfer completion & error */ + ebci = AT_DMA_BTC(chan_id) + | AT_DMA_ERR(chan_id); + if (on) + dma_writel(atdma, EBCIER, ebci); + else + dma_writel(atdma, EBCIDR, ebci); +} + +static void atc_enable_chan_irq(struct at_dma *atdma, int chan_id) +{ + atc_setup_irq(atdma, chan_id, 1); +} + +static void atc_disable_chan_irq(struct at_dma *atdma, int chan_id) +{ + atc_setup_irq(atdma, chan_id, 0); +} + + +/** + * atc_chan_is_enabled - test if given channel is enabled + * @atchan: channel we want to test status + */ +static inline int atc_chan_is_enabled(struct at_dma_chan *atchan) +{ + struct at_dma *atdma = to_at_dma(atchan->chan_common.device); + + return !!(dma_readl(atdma, CHSR) & atchan->mask); +} + +/** + * atc_chan_is_paused - test channel pause/resume status + * @atchan: channel we want to test status + */ +static inline int atc_chan_is_paused(struct at_dma_chan *atchan) +{ + return test_bit(ATC_IS_PAUSED, &atchan->status); +} + +/** + * atc_chan_is_cyclic - test if given channel has cyclic property set + * @atchan: channel we want to test status + */ +static inline int atc_chan_is_cyclic(struct at_dma_chan *atchan) +{ + return test_bit(ATC_IS_CYCLIC, &atchan->status); +} + +/** + * set_desc_eol - set end-of-link to descriptor so it will end transfer + * @desc: descriptor, signle or at the end of a chain, to end chain on + */ +static void set_desc_eol(struct at_desc *desc) +{ + u32 ctrlb = desc->lli.ctrlb; + + ctrlb &= ~ATC_IEN; + ctrlb |= ATC_SRC_DSCR_DIS | ATC_DST_DSCR_DIS; + + desc->lli.ctrlb = ctrlb; + desc->lli.dscr = 0; +} + +#endif /* AT_HDMAC_REGS_H */ diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c new file mode 100644 index 000000000..7992164ea --- /dev/null +++ b/drivers/dma/at_xdmac.c @@ -0,0 +1,1582 @@ +/* + * Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems) + * + * Copyright (C) 2014 Atmel Corporation + * + * Author: Ludovic Desroches <ludovic.desroches@atmel.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <asm/barrier.h> +#include <dt-bindings/dma/at91.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/of_dma.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm.h> + +#include "dmaengine.h" + +/* Global registers */ +#define AT_XDMAC_GTYPE 0x00 /* Global Type Register */ +#define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */ +#define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */ +#define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */ +#define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */ +#define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */ +#define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */ +#define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */ +#define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */ +#define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */ +#define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */ +#define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */ +#define AT_XDMAC_GS 0x24 /* Global Channel Status Register */ +#define AT_XDMAC_GRS 0x28 /* Global Channel Read Suspend Register */ +#define AT_XDMAC_GWS 0x2C /* Global Write Suspend Register */ +#define AT_XDMAC_GRWS 0x30 /* Global Channel Read Write Suspend Register */ +#define AT_XDMAC_GRWR 0x34 /* Global Channel Read Write Resume Register */ +#define AT_XDMAC_GSWR 0x38 /* Global Channel Software Request Register */ +#define AT_XDMAC_GSWS 0x3C /* Global channel Software Request Status Register */ +#define AT_XDMAC_GSWF 0x40 /* Global Channel Software Flush Request Register */ +#define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */ + +/* Channel relative registers offsets */ +#define AT_XDMAC_CIE 0x00 /* Channel Interrupt Enable Register */ +#define AT_XDMAC_CIE_BIE BIT(0) /* End of Block Interrupt Enable Bit */ +#define AT_XDMAC_CIE_LIE BIT(1) /* End of Linked List Interrupt Enable Bit */ +#define AT_XDMAC_CIE_DIE BIT(2) /* End of Disable Interrupt Enable Bit */ +#define AT_XDMAC_CIE_FIE BIT(3) /* End of Flush Interrupt Enable Bit */ +#define AT_XDMAC_CIE_RBEIE BIT(4) /* Read Bus Error Interrupt Enable Bit */ +#define AT_XDMAC_CIE_WBEIE BIT(5) /* Write Bus Error Interrupt Enable Bit */ +#define AT_XDMAC_CIE_ROIE BIT(6) /* Request Overflow Interrupt Enable Bit */ +#define AT_XDMAC_CID 0x04 /* Channel Interrupt Disable Register */ +#define AT_XDMAC_CID_BID BIT(0) /* End of Block Interrupt Disable Bit */ +#define AT_XDMAC_CID_LID BIT(1) /* End of Linked List Interrupt Disable Bit */ +#define AT_XDMAC_CID_DID BIT(2) /* End of Disable Interrupt Disable Bit */ +#define AT_XDMAC_CID_FID BIT(3) /* End of Flush Interrupt Disable Bit */ +#define AT_XDMAC_CID_RBEID BIT(4) /* Read Bus Error Interrupt Disable Bit */ +#define AT_XDMAC_CID_WBEID BIT(5) /* Write Bus Error Interrupt Disable Bit */ +#define AT_XDMAC_CID_ROID BIT(6) /* Request Overflow Interrupt Disable Bit */ +#define AT_XDMAC_CIM 0x08 /* Channel Interrupt Mask Register */ +#define AT_XDMAC_CIM_BIM BIT(0) /* End of Block Interrupt Mask Bit */ +#define AT_XDMAC_CIM_LIM BIT(1) /* End of Linked List Interrupt Mask Bit */ +#define AT_XDMAC_CIM_DIM BIT(2) /* End of Disable Interrupt Mask Bit */ +#define AT_XDMAC_CIM_FIM BIT(3) /* End of Flush Interrupt Mask Bit */ +#define AT_XDMAC_CIM_RBEIM BIT(4) /* Read Bus Error Interrupt Mask Bit */ +#define AT_XDMAC_CIM_WBEIM BIT(5) /* Write Bus Error Interrupt Mask Bit */ +#define AT_XDMAC_CIM_ROIM BIT(6) /* Request Overflow Interrupt Mask Bit */ +#define AT_XDMAC_CIS 0x0C /* Channel Interrupt Status Register */ +#define AT_XDMAC_CIS_BIS BIT(0) /* End of Block Interrupt Status Bit */ +#define AT_XDMAC_CIS_LIS BIT(1) /* End of Linked List Interrupt Status Bit */ +#define AT_XDMAC_CIS_DIS BIT(2) /* End of Disable Interrupt Status Bit */ +#define AT_XDMAC_CIS_FIS BIT(3) /* End of Flush Interrupt Status Bit */ +#define AT_XDMAC_CIS_RBEIS BIT(4) /* Read Bus Error Interrupt Status Bit */ +#define AT_XDMAC_CIS_WBEIS BIT(5) /* Write Bus Error Interrupt Status Bit */ +#define AT_XDMAC_CIS_ROIS BIT(6) /* Request Overflow Interrupt Status Bit */ +#define AT_XDMAC_CSA 0x10 /* Channel Source Address Register */ +#define AT_XDMAC_CDA 0x14 /* Channel Destination Address Register */ +#define AT_XDMAC_CNDA 0x18 /* Channel Next Descriptor Address Register */ +#define AT_XDMAC_CNDA_NDAIF(i) ((i) & 0x1) /* Channel x Next Descriptor Interface */ +#define AT_XDMAC_CNDA_NDA(i) ((i) & 0xfffffffc) /* Channel x Next Descriptor Address */ +#define AT_XDMAC_CNDC 0x1C /* Channel Next Descriptor Control Register */ +#define AT_XDMAC_CNDC_NDE (0x1 << 0) /* Channel x Next Descriptor Enable */ +#define AT_XDMAC_CNDC_NDSUP (0x1 << 1) /* Channel x Next Descriptor Source Update */ +#define AT_XDMAC_CNDC_NDDUP (0x1 << 2) /* Channel x Next Descriptor Destination Update */ +#define AT_XDMAC_CNDC_NDVIEW_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */ +#define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */ +#define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */ +#define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */ +#define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */ +#define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */ +#define AT_XDMAC_CC 0x28 /* Channel Configuration Register */ +#define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */ +#define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */ +#define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */ +#define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1) +#define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1) +#define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1) +#define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1) +#define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1) +#define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */ +#define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4) +#define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4) +#define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */ +#define AT_XDMAC_CC_PROT_SEC (0x0 << 5) +#define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5) +#define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */ +#define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6) +#define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6) +#define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */ +#define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7) +#define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7) +#define AT_XDMAC_CC_CSIZE(i) ((0x7 & (i)) << 8) /* Channel Chunk Size */ +#define AT_XDMAC_CC_DWIDTH_OFFSET 11 +#define AT_XDMAC_CC_DWIDTH_MASK (0x3 << AT_XDMAC_CC_DWIDTH_OFFSET) +#define AT_XDMAC_CC_DWIDTH(i) ((0x3 & (i)) << AT_XDMAC_CC_DWIDTH_OFFSET) /* Channel Data Width */ +#define AT_XDMAC_CC_DWIDTH_BYTE 0x0 +#define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1 +#define AT_XDMAC_CC_DWIDTH_WORD 0x2 +#define AT_XDMAC_CC_DWIDTH_DWORD 0x3 +#define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */ +#define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */ +#define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */ +#define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16) +#define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16) +#define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16) +#define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16) +#define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */ +#define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18) +#define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18) +#define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18) +#define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18) +#define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */ +#define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21) +#define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21) +#define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */ +#define AT_XDMAC_CC_RDIP_DONE (0x0 << 22) +#define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22) +#define AT_XDMAC_CC_WRIP (0x1 << 23) /* Write in Progress (read only) */ +#define AT_XDMAC_CC_WRIP_DONE (0x0 << 23) +#define AT_XDMAC_CC_WRIP_IN_PROGRESS (0x1 << 23) +#define AT_XDMAC_CC_PERID(i) (0x7f & (h) << 24) /* Channel Peripheral Identifier */ +#define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */ +#define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */ +#define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */ + +#define AT_XDMAC_CHAN_REG_BASE 0x50 /* Channel registers base address */ + +/* Microblock control members */ +#define AT_XDMAC_MBR_UBC_UBLEN_MAX 0xFFFFFFUL /* Maximum Microblock Length */ +#define AT_XDMAC_MBR_UBC_NDE (0x1 << 24) /* Next Descriptor Enable */ +#define AT_XDMAC_MBR_UBC_NSEN (0x1 << 25) /* Next Descriptor Source Update */ +#define AT_XDMAC_MBR_UBC_NDEN (0x1 << 26) /* Next Descriptor Destination Update */ +#define AT_XDMAC_MBR_UBC_NDV0 (0x0 << 27) /* Next Descriptor View 0 */ +#define AT_XDMAC_MBR_UBC_NDV1 (0x1 << 27) /* Next Descriptor View 1 */ +#define AT_XDMAC_MBR_UBC_NDV2 (0x2 << 27) /* Next Descriptor View 2 */ +#define AT_XDMAC_MBR_UBC_NDV3 (0x3 << 27) /* Next Descriptor View 3 */ + +#define AT_XDMAC_MAX_CHAN 0x20 +#define AT_XDMAC_MAX_CSIZE 16 /* 16 data */ +#define AT_XDMAC_MAX_DWIDTH 8 /* 64 bits */ + +#define AT_XDMAC_DMA_BUSWIDTHS\ + (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |\ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) + +enum atc_status { + AT_XDMAC_CHAN_IS_CYCLIC = 0, + AT_XDMAC_CHAN_IS_PAUSED, +}; + +/* ----- Channels ----- */ +struct at_xdmac_chan { + struct dma_chan chan; + void __iomem *ch_regs; + u32 mask; /* Channel Mask */ + u32 cfg; /* Channel Configuration Register */ + u8 perid; /* Peripheral ID */ + u8 perif; /* Peripheral Interface */ + u8 memif; /* Memory Interface */ + u32 save_cc; + u32 save_cim; + u32 save_cnda; + u32 save_cndc; + unsigned long status; + struct tasklet_struct tasklet; + struct dma_slave_config sconfig; + + spinlock_t lock; + + struct list_head xfers_list; + struct list_head free_descs_list; +}; + + +/* ----- Controller ----- */ +struct at_xdmac { + struct dma_device dma; + void __iomem *regs; + int irq; + struct clk *clk; + u32 save_gim; + u32 save_gs; + struct dma_pool *at_xdmac_desc_pool; + struct at_xdmac_chan chan[0]; +}; + + +/* ----- Descriptors ----- */ + +/* Linked List Descriptor */ +struct at_xdmac_lld { + dma_addr_t mbr_nda; /* Next Descriptor Member */ + u32 mbr_ubc; /* Microblock Control Member */ + dma_addr_t mbr_sa; /* Source Address Member */ + dma_addr_t mbr_da; /* Destination Address Member */ + u32 mbr_cfg; /* Configuration Register */ +}; + + +struct at_xdmac_desc { + struct at_xdmac_lld lld; + enum dma_transfer_direction direction; + struct dma_async_tx_descriptor tx_dma_desc; + struct list_head desc_node; + /* Following members are only used by the first descriptor */ + bool active_xfer; + unsigned int xfer_size; + struct list_head descs_list; + struct list_head xfer_node; +}; + +static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb) +{ + return atxdmac->regs + (AT_XDMAC_CHAN_REG_BASE + chan_nb * 0x40); +} + +#define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg)) +#define at_xdmac_write(atxdmac, reg, value) \ + writel_relaxed((value), (atxdmac)->regs + (reg)) + +#define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg)) +#define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg)) + +static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan) +{ + return container_of(dchan, struct at_xdmac_chan, chan); +} + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} + +static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev) +{ + return container_of(ddev, struct at_xdmac, dma); +} + +static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd) +{ + return container_of(txd, struct at_xdmac_desc, tx_dma_desc); +} + +static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan) +{ + return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); +} + +static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan) +{ + return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); +} + +static inline int at_xdmac_csize(u32 maxburst) +{ + int csize; + + csize = ffs(maxburst) - 1; + if (csize > 4) + csize = -EINVAL; + + return csize; +}; + +static inline u8 at_xdmac_get_dwidth(u32 cfg) +{ + return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET; +}; + +static unsigned int init_nr_desc_per_channel = 64; +module_param(init_nr_desc_per_channel, uint, 0644); +MODULE_PARM_DESC(init_nr_desc_per_channel, + "initial descriptors per channel (default: 64)"); + + +static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan) +{ + return at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask; +} + +static void at_xdmac_off(struct at_xdmac *atxdmac) +{ + at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L); + + /* Wait that all chans are disabled. */ + while (at_xdmac_read(atxdmac, AT_XDMAC_GS)) + cpu_relax(); + + at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L); +} + +/* Call with lock hold. */ +static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, + struct at_xdmac_desc *first) +{ + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + u32 reg; + + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first); + + if (at_xdmac_chan_is_enabled(atchan)) + return; + + /* Set transfer as active to not try to start it again. */ + first->active_xfer = true; + + /* Tell xdmac where to get the first descriptor. */ + reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys) + | AT_XDMAC_CNDA_NDAIF(atchan->memif); + at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg); + + /* + * When doing non cyclic transfer we need to use the next + * descriptor view 2 since some fields of the configuration register + * depend on transfer size and src/dest addresses. + */ + if (at_xdmac_chan_is_cyclic(atchan)) { + reg = AT_XDMAC_CNDC_NDVIEW_NDV1; + at_xdmac_chan_write(atchan, AT_XDMAC_CC, first->lld.mbr_cfg); + } else { + /* + * No need to write AT_XDMAC_CC reg, it will be done when the + * descriptor is fecthed. + */ + reg = AT_XDMAC_CNDC_NDVIEW_NDV2; + } + + reg |= AT_XDMAC_CNDC_NDDUP + | AT_XDMAC_CNDC_NDSUP + | AT_XDMAC_CNDC_NDE; + at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, reg); + + dev_vdbg(chan2dev(&atchan->chan), + "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", + __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); + + at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff); + reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE | AT_XDMAC_CIE_ROIE; + /* + * There is no end of list when doing cyclic dma, we need to get + * an interrupt after each periods. + */ + if (at_xdmac_chan_is_cyclic(atchan)) + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, + reg | AT_XDMAC_CIE_BIE); + else + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, + reg | AT_XDMAC_CIE_LIE); + at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask); + dev_vdbg(chan2dev(&atchan->chan), + "%s: enable channel (0x%08x)\n", __func__, atchan->mask); + wmb(); + at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); + + dev_vdbg(chan2dev(&atchan->chan), + "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", + __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); + +} + +static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct at_xdmac_desc *desc = txd_to_at_desc(tx); + struct at_xdmac_chan *atchan = to_at_xdmac_chan(tx->chan); + dma_cookie_t cookie; + unsigned long irqflags; + + spin_lock_irqsave(&atchan->lock, irqflags); + cookie = dma_cookie_assign(tx); + + dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n", + __func__, atchan, desc); + list_add_tail(&desc->xfer_node, &atchan->xfers_list); + if (list_is_singular(&atchan->xfers_list)) + at_xdmac_start_xfer(atchan, desc); + + spin_unlock_irqrestore(&atchan->lock, irqflags); + return cookie; +} + +static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan, + gfp_t gfp_flags) +{ + struct at_xdmac_desc *desc; + struct at_xdmac *atxdmac = to_at_xdmac(chan->device); + dma_addr_t phys; + + desc = dma_pool_alloc(atxdmac->at_xdmac_desc_pool, gfp_flags, &phys); + if (desc) { + memset(desc, 0, sizeof(*desc)); + INIT_LIST_HEAD(&desc->descs_list); + dma_async_tx_descriptor_init(&desc->tx_dma_desc, chan); + desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit; + desc->tx_dma_desc.phys = phys; + } + + return desc; +} + +/* Call must be protected by lock. */ +static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan) +{ + struct at_xdmac_desc *desc; + + if (list_empty(&atchan->free_descs_list)) { + desc = at_xdmac_alloc_desc(&atchan->chan, GFP_NOWAIT); + } else { + desc = list_first_entry(&atchan->free_descs_list, + struct at_xdmac_desc, desc_node); + list_del(&desc->desc_node); + desc->active_xfer = false; + } + + return desc; +} + +static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec, + struct of_dma *of_dma) +{ + struct at_xdmac *atxdmac = of_dma->of_dma_data; + struct at_xdmac_chan *atchan; + struct dma_chan *chan; + struct device *dev = atxdmac->dma.dev; + + if (dma_spec->args_count != 1) { + dev_err(dev, "dma phandler args: bad number of args\n"); + return NULL; + } + + chan = dma_get_any_slave_channel(&atxdmac->dma); + if (!chan) { + dev_err(dev, "can't get a dma channel\n"); + return NULL; + } + + atchan = to_at_xdmac_chan(chan); + atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]); + atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]); + atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[0]); + dev_dbg(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n", + atchan->memif, atchan->perif, atchan->perid); + + return chan; +} + +static int at_xdmac_compute_chan_conf(struct dma_chan *chan, + enum dma_transfer_direction direction) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + int csize, dwidth; + + if (direction == DMA_DEV_TO_MEM) { + atchan->cfg = + AT91_XDMAC_DT_PERID(atchan->perid) + | AT_XDMAC_CC_DAM_INCREMENTED_AM + | AT_XDMAC_CC_SAM_FIXED_AM + | AT_XDMAC_CC_DIF(atchan->memif) + | AT_XDMAC_CC_SIF(atchan->perif) + | AT_XDMAC_CC_SWREQ_HWR_CONNECTED + | AT_XDMAC_CC_DSYNC_PER2MEM + | AT_XDMAC_CC_MBSIZE_SIXTEEN + | AT_XDMAC_CC_TYPE_PER_TRAN; + csize = ffs(atchan->sconfig.src_maxburst) - 1; + if (csize < 0) { + dev_err(chan2dev(chan), "invalid src maxburst value\n"); + return -EINVAL; + } + atchan->cfg |= AT_XDMAC_CC_CSIZE(csize); + dwidth = ffs(atchan->sconfig.src_addr_width) - 1; + if (dwidth < 0) { + dev_err(chan2dev(chan), "invalid src addr width value\n"); + return -EINVAL; + } + atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth); + } else if (direction == DMA_MEM_TO_DEV) { + atchan->cfg = + AT91_XDMAC_DT_PERID(atchan->perid) + | AT_XDMAC_CC_DAM_FIXED_AM + | AT_XDMAC_CC_SAM_INCREMENTED_AM + | AT_XDMAC_CC_DIF(atchan->perif) + | AT_XDMAC_CC_SIF(atchan->memif) + | AT_XDMAC_CC_SWREQ_HWR_CONNECTED + | AT_XDMAC_CC_DSYNC_MEM2PER + | AT_XDMAC_CC_MBSIZE_SIXTEEN + | AT_XDMAC_CC_TYPE_PER_TRAN; + csize = ffs(atchan->sconfig.dst_maxburst) - 1; + if (csize < 0) { + dev_err(chan2dev(chan), "invalid src maxburst value\n"); + return -EINVAL; + } + atchan->cfg |= AT_XDMAC_CC_CSIZE(csize); + dwidth = ffs(atchan->sconfig.dst_addr_width) - 1; + if (dwidth < 0) { + dev_err(chan2dev(chan), "invalid dst addr width value\n"); + return -EINVAL; + } + atchan->cfg |= AT_XDMAC_CC_DWIDTH(dwidth); + } + + dev_dbg(chan2dev(chan), "%s: cfg=0x%08x\n", __func__, atchan->cfg); + + return 0; +} + +/* + * Only check that maxburst and addr width values are supported by the + * the controller but not that the configuration is good to perform the + * transfer since we don't know the direction at this stage. + */ +static int at_xdmac_check_slave_config(struct dma_slave_config *sconfig) +{ + if ((sconfig->src_maxburst > AT_XDMAC_MAX_CSIZE) + || (sconfig->dst_maxburst > AT_XDMAC_MAX_CSIZE)) + return -EINVAL; + + if ((sconfig->src_addr_width > AT_XDMAC_MAX_DWIDTH) + || (sconfig->dst_addr_width > AT_XDMAC_MAX_DWIDTH)) + return -EINVAL; + + return 0; +} + +static int at_xdmac_set_slave_config(struct dma_chan *chan, + struct dma_slave_config *sconfig) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + + if (at_xdmac_check_slave_config(sconfig)) { + dev_err(chan2dev(chan), "invalid slave configuration\n"); + return -EINVAL; + } + + memcpy(&atchan->sconfig, sconfig, sizeof(atchan->sconfig)); + + return 0; +} + +static struct dma_async_tx_descriptor * +at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *first = NULL, *prev = NULL; + struct scatterlist *sg; + int i; + unsigned int xfer_size = 0; + unsigned long irqflags; + struct dma_async_tx_descriptor *ret = NULL; + + if (!sgl) + return NULL; + + if (!is_slave_direction(direction)) { + dev_err(chan2dev(chan), "invalid DMA direction\n"); + return NULL; + } + + dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n", + __func__, sg_len, + direction == DMA_MEM_TO_DEV ? "to device" : "from device", + flags); + + /* Protect dma_sconfig field that can be modified by set_slave_conf. */ + spin_lock_irqsave(&atchan->lock, irqflags); + + if (at_xdmac_compute_chan_conf(chan, direction)) + goto spin_unlock; + + /* Prepare descriptors. */ + for_each_sg(sgl, sg, sg_len, i) { + struct at_xdmac_desc *desc = NULL; + u32 len, mem, dwidth, fixed_dwidth; + + len = sg_dma_len(sg); + mem = sg_dma_address(sg); + if (unlikely(!len)) { + dev_err(chan2dev(chan), "sg data length is zero\n"); + goto spin_unlock; + } + dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n", + __func__, i, len, mem); + + desc = at_xdmac_get_desc(atchan); + if (!desc) { + dev_err(chan2dev(chan), "can't get descriptor\n"); + if (first) + list_splice_init(&first->descs_list, &atchan->free_descs_list); + goto spin_unlock; + } + + /* Linked list descriptor setup. */ + if (direction == DMA_DEV_TO_MEM) { + desc->lld.mbr_sa = atchan->sconfig.src_addr; + desc->lld.mbr_da = mem; + } else { + desc->lld.mbr_sa = mem; + desc->lld.mbr_da = atchan->sconfig.dst_addr; + } + desc->lld.mbr_cfg = atchan->cfg; + dwidth = at_xdmac_get_dwidth(desc->lld.mbr_cfg); + fixed_dwidth = IS_ALIGNED(len, 1 << dwidth) + ? at_xdmac_get_dwidth(desc->lld.mbr_cfg) + : AT_XDMAC_CC_DWIDTH_BYTE; + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 /* next descriptor view */ + | AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */ + | AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */ + | (i == sg_len - 1 ? 0 : AT_XDMAC_MBR_UBC_NDE) /* descriptor fetch */ + | (len >> fixed_dwidth); /* microblock length */ + dev_dbg(chan2dev(chan), + "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n", + __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); + + /* Chain lld. */ + if (prev) { + prev->lld.mbr_nda = desc->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", + __func__, prev, &prev->lld.mbr_nda); + } + + prev = desc; + if (!first) + first = desc; + + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", + __func__, desc, first); + list_add_tail(&desc->desc_node, &first->descs_list); + xfer_size += len; + } + + + first->tx_dma_desc.flags = flags; + first->xfer_size = xfer_size; + first->direction = direction; + ret = &first->tx_dma_desc; + +spin_unlock: + spin_unlock_irqrestore(&atchan->lock, irqflags); + return ret; +} + +static struct dma_async_tx_descriptor * +at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, + size_t buf_len, size_t period_len, + enum dma_transfer_direction direction, + unsigned long flags) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *first = NULL, *prev = NULL; + unsigned int periods = buf_len / period_len; + int i; + unsigned long irqflags; + + dev_dbg(chan2dev(chan), "%s: buf_addr=%pad, buf_len=%zd, period_len=%zd, dir=%s, flags=0x%lx\n", + __func__, &buf_addr, buf_len, period_len, + direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem", flags); + + if (!is_slave_direction(direction)) { + dev_err(chan2dev(chan), "invalid DMA direction\n"); + return NULL; + } + + if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) { + dev_err(chan2dev(chan), "channel currently used\n"); + return NULL; + } + + if (at_xdmac_compute_chan_conf(chan, direction)) + return NULL; + + for (i = 0; i < periods; i++) { + struct at_xdmac_desc *desc = NULL; + + spin_lock_irqsave(&atchan->lock, irqflags); + desc = at_xdmac_get_desc(atchan); + if (!desc) { + dev_err(chan2dev(chan), "can't get descriptor\n"); + if (first) + list_splice_init(&first->descs_list, &atchan->free_descs_list); + spin_unlock_irqrestore(&atchan->lock, irqflags); + return NULL; + } + spin_unlock_irqrestore(&atchan->lock, irqflags); + dev_dbg(chan2dev(chan), + "%s: desc=0x%p, tx_dma_desc.phys=%pad\n", + __func__, desc, &desc->tx_dma_desc.phys); + + if (direction == DMA_DEV_TO_MEM) { + desc->lld.mbr_sa = atchan->sconfig.src_addr; + desc->lld.mbr_da = buf_addr + i * period_len; + } else { + desc->lld.mbr_sa = buf_addr + i * period_len; + desc->lld.mbr_da = atchan->sconfig.dst_addr; + } + desc->lld.mbr_cfg = atchan->cfg; + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 + | AT_XDMAC_MBR_UBC_NDEN + | AT_XDMAC_MBR_UBC_NSEN + | AT_XDMAC_MBR_UBC_NDE + | period_len >> at_xdmac_get_dwidth(desc->lld.mbr_cfg); + + dev_dbg(chan2dev(chan), + "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n", + __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); + + /* Chain lld. */ + if (prev) { + prev->lld.mbr_nda = desc->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", + __func__, prev, &prev->lld.mbr_nda); + } + + prev = desc; + if (!first) + first = desc; + + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", + __func__, desc, first); + list_add_tail(&desc->desc_node, &first->descs_list); + } + + prev->lld.mbr_nda = first->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", + __func__, prev, &prev->lld.mbr_nda); + first->tx_dma_desc.flags = flags; + first->xfer_size = buf_len; + first->direction = direction; + + return &first->tx_dma_desc; +} + +static struct dma_async_tx_descriptor * +at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *first = NULL, *prev = NULL; + size_t remaining_size = len, xfer_size = 0, ublen; + dma_addr_t src_addr = src, dst_addr = dest; + u32 dwidth; + /* + * WARNING: We don't know the direction, it involves we can't + * dynamically set the source and dest interface so we have to use the + * same one. Only interface 0 allows EBI access. Hopefully we can + * access DDR through both ports (at least on SAMA5D4x), so we can use + * the same interface for source and dest, that solves the fact we + * don't know the direction. + */ + u32 chan_cc = AT_XDMAC_CC_DAM_INCREMENTED_AM + | AT_XDMAC_CC_SAM_INCREMENTED_AM + | AT_XDMAC_CC_DIF(0) + | AT_XDMAC_CC_SIF(0) + | AT_XDMAC_CC_MBSIZE_SIXTEEN + | AT_XDMAC_CC_TYPE_MEM_TRAN; + unsigned long irqflags; + + dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, len=%zd, flags=0x%lx\n", + __func__, &src, &dest, len, flags); + + if (unlikely(!len)) + return NULL; + + /* + * Check address alignment to select the greater data width we can use. + * Some XDMAC implementations don't provide dword transfer, in this + * case selecting dword has the same behavior as selecting word transfers. + */ + if (!((src_addr | dst_addr) & 7)) { + dwidth = AT_XDMAC_CC_DWIDTH_DWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); + } else if (!((src_addr | dst_addr) & 3)) { + dwidth = AT_XDMAC_CC_DWIDTH_WORD; + dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); + } else if (!((src_addr | dst_addr) & 1)) { + dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); + } else { + dwidth = AT_XDMAC_CC_DWIDTH_BYTE; + dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); + } + + /* Prepare descriptors. */ + while (remaining_size) { + struct at_xdmac_desc *desc = NULL; + + dev_dbg(chan2dev(chan), "%s: remaining_size=%zu\n", __func__, remaining_size); + + spin_lock_irqsave(&atchan->lock, irqflags); + desc = at_xdmac_get_desc(atchan); + spin_unlock_irqrestore(&atchan->lock, irqflags); + if (!desc) { + dev_err(chan2dev(chan), "can't get descriptor\n"); + if (first) + list_splice_init(&first->descs_list, &atchan->free_descs_list); + return NULL; + } + + /* Update src and dest addresses. */ + src_addr += xfer_size; + dst_addr += xfer_size; + + if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth) + xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth; + else + xfer_size = remaining_size; + + dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n", __func__, xfer_size); + + /* Check remaining length and change data width if needed. */ + if (!((src_addr | dst_addr | xfer_size) & 7)) { + dwidth = AT_XDMAC_CC_DWIDTH_DWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); + } else if (!((src_addr | dst_addr | xfer_size) & 3)) { + dwidth = AT_XDMAC_CC_DWIDTH_WORD; + dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); + } else if (!((src_addr | dst_addr | xfer_size) & 1)) { + dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); + } else if ((src_addr | dst_addr | xfer_size) & 1) { + dwidth = AT_XDMAC_CC_DWIDTH_BYTE; + dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); + } + chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth); + + ublen = xfer_size >> dwidth; + remaining_size -= xfer_size; + + desc->lld.mbr_sa = src_addr; + desc->lld.mbr_da = dst_addr; + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 + | AT_XDMAC_MBR_UBC_NDEN + | AT_XDMAC_MBR_UBC_NSEN + | (remaining_size ? AT_XDMAC_MBR_UBC_NDE : 0) + | ublen; + desc->lld.mbr_cfg = chan_cc; + + dev_dbg(chan2dev(chan), + "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n", + __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg); + + /* Chain lld. */ + if (prev) { + prev->lld.mbr_nda = desc->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n", + __func__, prev, prev->lld.mbr_nda); + } + + prev = desc; + if (!first) + first = desc; + + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", + __func__, desc, first); + list_add_tail(&desc->desc_node, &first->descs_list); + } + + first->tx_dma_desc.flags = flags; + first->xfer_size = len; + + return &first->tx_dma_desc; +} + +static enum dma_status +at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + struct at_xdmac_desc *desc, *_desc; + struct list_head *descs_list; + enum dma_status ret; + int residue; + u32 cur_nda, mask, value; + u8 dwidth = 0; + unsigned long flags; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + if (!txstate) + return ret; + + spin_lock_irqsave(&atchan->lock, flags); + + desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); + + /* + * If the transfer has not been started yet, don't need to compute the + * residue, it's the transfer length. + */ + if (!desc->active_xfer) { + dma_set_residue(txstate, desc->xfer_size); + goto spin_unlock; + } + + residue = desc->xfer_size; + /* + * Flush FIFO: only relevant when the transfer is source peripheral + * synchronized. + */ + mask = AT_XDMAC_CC_TYPE | AT_XDMAC_CC_DSYNC; + value = AT_XDMAC_CC_TYPE_PER_TRAN | AT_XDMAC_CC_DSYNC_PER2MEM; + if ((desc->lld.mbr_cfg & mask) == value) { + at_xdmac_write(atxdmac, AT_XDMAC_GSWF, atchan->mask); + while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS)) + cpu_relax(); + } + + cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc; + /* + * Remove size of all microblocks already transferred and the current + * one. Then add the remaining size to transfer of the current + * microblock. + */ + descs_list = &desc->descs_list; + list_for_each_entry_safe(desc, _desc, descs_list, desc_node) { + dwidth = at_xdmac_get_dwidth(desc->lld.mbr_cfg); + residue -= (desc->lld.mbr_ubc & 0xffffff) << dwidth; + if ((desc->lld.mbr_nda & 0xfffffffc) == cur_nda) + break; + } + residue += at_xdmac_chan_read(atchan, AT_XDMAC_CUBC) << dwidth; + + dma_set_residue(txstate, residue); + + dev_dbg(chan2dev(chan), + "%s: desc=0x%p, tx_dma_desc.phys=%pad, tx_status=%d, cookie=%d, residue=%d\n", + __func__, desc, &desc->tx_dma_desc.phys, ret, cookie, residue); + +spin_unlock: + spin_unlock_irqrestore(&atchan->lock, flags); + return ret; +} + +/* Call must be protected by lock. */ +static void at_xdmac_remove_xfer(struct at_xdmac_chan *atchan, + struct at_xdmac_desc *desc) +{ + dev_dbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); + + /* + * Remove the transfer from the transfer list then move the transfer + * descriptors into the free descriptors list. + */ + list_del(&desc->xfer_node); + list_splice_init(&desc->descs_list, &atchan->free_descs_list); +} + +static void at_xdmac_advance_work(struct at_xdmac_chan *atchan) +{ + struct at_xdmac_desc *desc; + unsigned long flags; + + spin_lock_irqsave(&atchan->lock, flags); + + /* + * If channel is enabled, do nothing, advance_work will be triggered + * after the interruption. + */ + if (!at_xdmac_chan_is_enabled(atchan) && !list_empty(&atchan->xfers_list)) { + desc = list_first_entry(&atchan->xfers_list, + struct at_xdmac_desc, + xfer_node); + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); + if (!desc->active_xfer) + at_xdmac_start_xfer(atchan, desc); + } + + spin_unlock_irqrestore(&atchan->lock, flags); +} + +static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan) +{ + struct at_xdmac_desc *desc; + struct dma_async_tx_descriptor *txd; + + desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); + txd = &desc->tx_dma_desc; + + if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) + txd->callback(txd->callback_param); +} + +static void at_xdmac_tasklet(unsigned long data) +{ + struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data; + struct at_xdmac_desc *desc; + u32 error_mask; + + dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08lx\n", + __func__, atchan->status); + + error_mask = AT_XDMAC_CIS_RBEIS + | AT_XDMAC_CIS_WBEIS + | AT_XDMAC_CIS_ROIS; + + if (at_xdmac_chan_is_cyclic(atchan)) { + at_xdmac_handle_cyclic(atchan); + } else if ((atchan->status & AT_XDMAC_CIS_LIS) + || (atchan->status & error_mask)) { + struct dma_async_tx_descriptor *txd; + + if (atchan->status & AT_XDMAC_CIS_RBEIS) + dev_err(chan2dev(&atchan->chan), "read bus error!!!"); + if (atchan->status & AT_XDMAC_CIS_WBEIS) + dev_err(chan2dev(&atchan->chan), "write bus error!!!"); + if (atchan->status & AT_XDMAC_CIS_ROIS) + dev_err(chan2dev(&atchan->chan), "request overflow error!!!"); + + spin_lock_bh(&atchan->lock); + desc = list_first_entry(&atchan->xfers_list, + struct at_xdmac_desc, + xfer_node); + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); + BUG_ON(!desc->active_xfer); + + txd = &desc->tx_dma_desc; + + at_xdmac_remove_xfer(atchan, desc); + spin_unlock_bh(&atchan->lock); + + if (!at_xdmac_chan_is_cyclic(atchan)) { + dma_cookie_complete(txd); + if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) + txd->callback(txd->callback_param); + } + + dma_run_dependencies(txd); + + at_xdmac_advance_work(atchan); + } +} + +static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id) +{ + struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id; + struct at_xdmac_chan *atchan; + u32 imr, status, pending; + u32 chan_imr, chan_status; + int i, ret = IRQ_NONE; + + do { + imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM); + status = at_xdmac_read(atxdmac, AT_XDMAC_GIS); + pending = status & imr; + + dev_vdbg(atxdmac->dma.dev, + "%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n", + __func__, status, imr, pending); + + if (!pending) + break; + + /* We have to find which channel has generated the interrupt. */ + for (i = 0; i < atxdmac->dma.chancnt; i++) { + if (!((1 << i) & pending)) + continue; + + atchan = &atxdmac->chan[i]; + chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); + chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS); + atchan->status = chan_status & chan_imr; + dev_vdbg(atxdmac->dma.dev, + "%s: chan%d: imr=0x%x, status=0x%x\n", + __func__, i, chan_imr, chan_status); + dev_vdbg(chan2dev(&atchan->chan), + "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", + __func__, + at_xdmac_chan_read(atchan, AT_XDMAC_CC), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); + + if (atchan->status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS)) + at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); + + tasklet_schedule(&atchan->tasklet); + ret = IRQ_HANDLED; + } + + } while (pending); + + return ret; +} + +static void at_xdmac_issue_pending(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + + dev_dbg(chan2dev(&atchan->chan), "%s\n", __func__); + + if (!at_xdmac_chan_is_cyclic(atchan)) + at_xdmac_advance_work(atchan); + + return; +} + +static int at_xdmac_device_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + int ret; + unsigned long flags; + + dev_dbg(chan2dev(chan), "%s\n", __func__); + + spin_lock_irqsave(&atchan->lock, flags); + ret = at_xdmac_set_slave_config(chan, config); + spin_unlock_irqrestore(&atchan->lock, flags); + + return ret; +} + +static int at_xdmac_device_pause(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + unsigned long flags; + + dev_dbg(chan2dev(chan), "%s\n", __func__); + + if (test_and_set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status)) + return 0; + + spin_lock_irqsave(&atchan->lock, flags); + at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask); + while (at_xdmac_chan_read(atchan, AT_XDMAC_CC) + & (AT_XDMAC_CC_WRIP | AT_XDMAC_CC_RDIP)) + cpu_relax(); + spin_unlock_irqrestore(&atchan->lock, flags); + + return 0; +} + +static int at_xdmac_device_resume(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + unsigned long flags; + + dev_dbg(chan2dev(chan), "%s\n", __func__); + + spin_lock_irqsave(&atchan->lock, flags); + if (!at_xdmac_chan_is_paused(atchan)) { + spin_unlock_irqrestore(&atchan->lock, flags); + return 0; + } + + at_xdmac_write(atxdmac, AT_XDMAC_GRWR, atchan->mask); + clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); + spin_unlock_irqrestore(&atchan->lock, flags); + + return 0; +} + +static int at_xdmac_device_terminate_all(struct dma_chan *chan) +{ + struct at_xdmac_desc *desc, *_desc; + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + unsigned long flags; + + dev_dbg(chan2dev(chan), "%s\n", __func__); + + spin_lock_irqsave(&atchan->lock, flags); + at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); + while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask) + cpu_relax(); + + /* Cancel all pending transfers. */ + list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) + at_xdmac_remove_xfer(atchan, desc); + + clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); + spin_unlock_irqrestore(&atchan->lock, flags); + + return 0; +} + +static int at_xdmac_alloc_chan_resources(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *desc; + int i; + unsigned long flags; + + spin_lock_irqsave(&atchan->lock, flags); + + if (at_xdmac_chan_is_enabled(atchan)) { + dev_err(chan2dev(chan), + "can't allocate channel resources (channel enabled)\n"); + i = -EIO; + goto spin_unlock; + } + + if (!list_empty(&atchan->free_descs_list)) { + dev_err(chan2dev(chan), + "can't allocate channel resources (channel not free from a previous use)\n"); + i = -EIO; + goto spin_unlock; + } + + for (i = 0; i < init_nr_desc_per_channel; i++) { + desc = at_xdmac_alloc_desc(chan, GFP_ATOMIC); + if (!desc) { + dev_warn(chan2dev(chan), + "only %d descriptors have been allocated\n", i); + break; + } + list_add_tail(&desc->desc_node, &atchan->free_descs_list); + } + + dma_cookie_init(chan); + + dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i); + +spin_unlock: + spin_unlock_irqrestore(&atchan->lock, flags); + return i; +} + +static void at_xdmac_free_chan_resources(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(chan->device); + struct at_xdmac_desc *desc, *_desc; + + list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) { + dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n", __func__, desc); + list_del(&desc->desc_node); + dma_pool_free(atxdmac->at_xdmac_desc_pool, desc, desc->tx_dma_desc.phys); + } + + return; +} + +#ifdef CONFIG_PM +static int atmel_xdmac_prepare(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + + /* Wait for transfer completion, except in cyclic case. */ + if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan)) + return -EAGAIN; + } + return 0; +} +#else +# define atmel_xdmac_prepare NULL +#endif + +#ifdef CONFIG_PM_SLEEP +static int atmel_xdmac_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + + atchan->save_cc = at_xdmac_chan_read(atchan, AT_XDMAC_CC); + if (at_xdmac_chan_is_cyclic(atchan)) { + if (!at_xdmac_chan_is_paused(atchan)) + at_xdmac_device_pause(chan); + atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); + atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA); + atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC); + } + } + atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM); + + at_xdmac_off(atxdmac); + clk_disable_unprepare(atxdmac->clk); + return 0; +} + +static int atmel_xdmac_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); + struct at_xdmac_chan *atchan; + struct dma_chan *chan, *_chan; + int i; + + clk_prepare_enable(atxdmac->clk); + + /* Clear pending interrupts. */ + for (i = 0; i < atxdmac->dma.chancnt; i++) { + atchan = &atxdmac->chan[i]; + while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) + cpu_relax(); + } + + at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim); + at_xdmac_write(atxdmac, AT_XDMAC_GE, atxdmac->save_gs); + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { + atchan = to_at_xdmac_chan(chan); + at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc); + if (at_xdmac_chan_is_cyclic(atchan)) { + at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda); + at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc); + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim); + wmb(); + at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); + } + } + return 0; +} +#endif /* CONFIG_PM_SLEEP */ + +static int at_xdmac_probe(struct platform_device *pdev) +{ + struct resource *res; + struct at_xdmac *atxdmac; + int irq, size, nr_channels, i, ret; + void __iomem *base; + u32 reg; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + /* + * Read number of xdmac channels, read helper function can't be used + * since atxdmac is not yet allocated and we need to know the number + * of channels to do the allocation. + */ + reg = readl_relaxed(base + AT_XDMAC_GTYPE); + nr_channels = AT_XDMAC_NB_CH(reg); + if (nr_channels > AT_XDMAC_MAX_CHAN) { + dev_err(&pdev->dev, "invalid number of channels (%u)\n", + nr_channels); + return -EINVAL; + } + + size = sizeof(*atxdmac); + size += nr_channels * sizeof(struct at_xdmac_chan); + atxdmac = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); + if (!atxdmac) { + dev_err(&pdev->dev, "can't allocate at_xdmac structure\n"); + return -ENOMEM; + } + + atxdmac->regs = base; + atxdmac->irq = irq; + + atxdmac->clk = devm_clk_get(&pdev->dev, "dma_clk"); + if (IS_ERR(atxdmac->clk)) { + dev_err(&pdev->dev, "can't get dma_clk\n"); + return PTR_ERR(atxdmac->clk); + } + + /* Do not use dev res to prevent races with tasklet */ + ret = request_irq(atxdmac->irq, at_xdmac_interrupt, 0, "at_xdmac", atxdmac); + if (ret) { + dev_err(&pdev->dev, "can't request irq\n"); + return ret; + } + + ret = clk_prepare_enable(atxdmac->clk); + if (ret) { + dev_err(&pdev->dev, "can't prepare or enable clock\n"); + goto err_free_irq; + } + + atxdmac->at_xdmac_desc_pool = + dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, + sizeof(struct at_xdmac_desc), 4, 0); + if (!atxdmac->at_xdmac_desc_pool) { + dev_err(&pdev->dev, "no memory for descriptors dma pool\n"); + ret = -ENOMEM; + goto err_clk_disable; + } + + dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask); + dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask); + dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask); + /* + * Without DMA_PRIVATE the driver is not able to allocate more than + * one channel, second allocation fails in private_candidate. + */ + dma_cap_set(DMA_PRIVATE, atxdmac->dma.cap_mask); + atxdmac->dma.dev = &pdev->dev; + atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources; + atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources; + atxdmac->dma.device_tx_status = at_xdmac_tx_status; + atxdmac->dma.device_issue_pending = at_xdmac_issue_pending; + atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic; + atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy; + atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg; + atxdmac->dma.device_config = at_xdmac_device_config; + atxdmac->dma.device_pause = at_xdmac_device_pause; + atxdmac->dma.device_resume = at_xdmac_device_resume; + atxdmac->dma.device_terminate_all = at_xdmac_device_terminate_all; + atxdmac->dma.src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; + atxdmac->dma.dst_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; + atxdmac->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + atxdmac->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + /* Disable all chans and interrupts. */ + at_xdmac_off(atxdmac); + + /* Init channels. */ + INIT_LIST_HEAD(&atxdmac->dma.channels); + for (i = 0; i < nr_channels; i++) { + struct at_xdmac_chan *atchan = &atxdmac->chan[i]; + + atchan->chan.device = &atxdmac->dma; + list_add_tail(&atchan->chan.device_node, + &atxdmac->dma.channels); + + atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, i); + atchan->mask = 1 << i; + + spin_lock_init(&atchan->lock); + INIT_LIST_HEAD(&atchan->xfers_list); + INIT_LIST_HEAD(&atchan->free_descs_list); + tasklet_init(&atchan->tasklet, at_xdmac_tasklet, + (unsigned long)atchan); + + /* Clear pending interrupts. */ + while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) + cpu_relax(); + } + platform_set_drvdata(pdev, atxdmac); + + ret = dma_async_device_register(&atxdmac->dma); + if (ret) { + dev_err(&pdev->dev, "fail to register DMA engine device\n"); + goto err_clk_disable; + } + + ret = of_dma_controller_register(pdev->dev.of_node, + at_xdmac_xlate, atxdmac); + if (ret) { + dev_err(&pdev->dev, "could not register of dma controller\n"); + goto err_dma_unregister; + } + + dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n", + nr_channels, atxdmac->regs); + + return 0; + +err_dma_unregister: + dma_async_device_unregister(&atxdmac->dma); +err_clk_disable: + clk_disable_unprepare(atxdmac->clk); +err_free_irq: + free_irq(atxdmac->irq, atxdmac->dma.dev); + return ret; +} + +static int at_xdmac_remove(struct platform_device *pdev) +{ + struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev); + int i; + + at_xdmac_off(atxdmac); + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&atxdmac->dma); + clk_disable_unprepare(atxdmac->clk); + + synchronize_irq(atxdmac->irq); + + free_irq(atxdmac->irq, atxdmac->dma.dev); + + for (i = 0; i < atxdmac->dma.chancnt; i++) { + struct at_xdmac_chan *atchan = &atxdmac->chan[i]; + + tasklet_kill(&atchan->tasklet); + at_xdmac_free_chan_resources(&atchan->chan); + } + + return 0; +} + +static const struct dev_pm_ops atmel_xdmac_dev_pm_ops = { + .prepare = atmel_xdmac_prepare, + SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume) +}; + +static const struct of_device_id atmel_xdmac_dt_ids[] = { + { + .compatible = "atmel,sama5d4-dma", + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids); + +static struct platform_driver at_xdmac_driver = { + .probe = at_xdmac_probe, + .remove = at_xdmac_remove, + .driver = { + .name = "at_xdmac", + .of_match_table = of_match_ptr(atmel_xdmac_dt_ids), + .pm = &atmel_xdmac_dev_pm_ops, + } +}; + +static int __init at_xdmac_init(void) +{ + return platform_driver_probe(&at_xdmac_driver, at_xdmac_probe); +} +subsys_initcall(at_xdmac_init); + +MODULE_DESCRIPTION("Atmel Extended DMA Controller driver"); +MODULE_AUTHOR("Ludovic Desroches <ludovic.desroches@atmel.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c new file mode 100644 index 000000000..c92d6a70c --- /dev/null +++ b/drivers/dma/bcm2835-dma.c @@ -0,0 +1,681 @@ +/* + * BCM2835 DMA engine support + * + * This driver only supports cyclic DMA transfers + * as needed for the I2S module. + * + * Author: Florian Meier <florian.meier@koalo.de> + * Copyright 2013 + * + * Based on + * OMAP DMAengine support by Russell King + * + * BCM2708 DMA Driver + * Copyright (C) 2010 Broadcom + * + * Raspberry Pi PCM I2S ALSA Driver + * Copyright (c) by Phil Poole 2013 + * + * MARVELL MMP Peripheral DMA Driver + * Copyright 2012 Marvell International Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/io.h> +#include <linux/spinlock.h> +#include <linux/of.h> +#include <linux/of_dma.h> + +#include "virt-dma.h" + +struct bcm2835_dmadev { + struct dma_device ddev; + spinlock_t lock; + void __iomem *base; + struct device_dma_parameters dma_parms; +}; + +struct bcm2835_dma_cb { + uint32_t info; + uint32_t src; + uint32_t dst; + uint32_t length; + uint32_t stride; + uint32_t next; + uint32_t pad[2]; +}; + +struct bcm2835_chan { + struct virt_dma_chan vc; + struct list_head node; + + struct dma_slave_config cfg; + bool cyclic; + unsigned int dreq; + + int ch; + struct bcm2835_desc *desc; + + void __iomem *chan_base; + int irq_number; +}; + +struct bcm2835_desc { + struct virt_dma_desc vd; + enum dma_transfer_direction dir; + + unsigned int control_block_size; + struct bcm2835_dma_cb *control_block_base; + dma_addr_t control_block_base_phys; + + unsigned int frames; + size_t size; +}; + +#define BCM2835_DMA_CS 0x00 +#define BCM2835_DMA_ADDR 0x04 +#define BCM2835_DMA_SOURCE_AD 0x0c +#define BCM2835_DMA_DEST_AD 0x10 +#define BCM2835_DMA_NEXTCB 0x1C + +/* DMA CS Control and Status bits */ +#define BCM2835_DMA_ACTIVE BIT(0) +#define BCM2835_DMA_INT BIT(2) +#define BCM2835_DMA_ISPAUSED BIT(4) /* Pause requested or not active */ +#define BCM2835_DMA_ISHELD BIT(5) /* Is held by DREQ flow control */ +#define BCM2835_DMA_ERR BIT(8) +#define BCM2835_DMA_ABORT BIT(30) /* Stop current CB, go to next, WO */ +#define BCM2835_DMA_RESET BIT(31) /* WO, self clearing */ + +#define BCM2835_DMA_INT_EN BIT(0) +#define BCM2835_DMA_D_INC BIT(4) +#define BCM2835_DMA_D_DREQ BIT(6) +#define BCM2835_DMA_S_INC BIT(8) +#define BCM2835_DMA_S_DREQ BIT(10) + +#define BCM2835_DMA_PER_MAP(x) ((x) << 16) + +#define BCM2835_DMA_DATA_TYPE_S8 1 +#define BCM2835_DMA_DATA_TYPE_S16 2 +#define BCM2835_DMA_DATA_TYPE_S32 4 +#define BCM2835_DMA_DATA_TYPE_S128 16 + +#define BCM2835_DMA_BULK_MASK BIT(0) +#define BCM2835_DMA_FIQ_MASK (BIT(2) | BIT(3)) + +/* Valid only for channels 0 - 14, 15 has its own base address */ +#define BCM2835_DMA_CHAN(n) ((n) << 8) /* Base address */ +#define BCM2835_DMA_CHANIO(base, n) ((base) + BCM2835_DMA_CHAN(n)) + +static inline struct bcm2835_dmadev *to_bcm2835_dma_dev(struct dma_device *d) +{ + return container_of(d, struct bcm2835_dmadev, ddev); +} + +static inline struct bcm2835_chan *to_bcm2835_dma_chan(struct dma_chan *c) +{ + return container_of(c, struct bcm2835_chan, vc.chan); +} + +static inline struct bcm2835_desc *to_bcm2835_dma_desc( + struct dma_async_tx_descriptor *t) +{ + return container_of(t, struct bcm2835_desc, vd.tx); +} + +static void bcm2835_dma_desc_free(struct virt_dma_desc *vd) +{ + struct bcm2835_desc *desc = container_of(vd, struct bcm2835_desc, vd); + dma_free_coherent(desc->vd.tx.chan->device->dev, + desc->control_block_size, + desc->control_block_base, + desc->control_block_base_phys); + kfree(desc); +} + +static int bcm2835_dma_abort(void __iomem *chan_base) +{ + unsigned long cs; + long int timeout = 10000; + + cs = readl(chan_base + BCM2835_DMA_CS); + if (!(cs & BCM2835_DMA_ACTIVE)) + return 0; + + /* Write 0 to the active bit - Pause the DMA */ + writel(0, chan_base + BCM2835_DMA_CS); + + /* Wait for any current AXI transfer to complete */ + while ((cs & BCM2835_DMA_ISPAUSED) && --timeout) { + cpu_relax(); + cs = readl(chan_base + BCM2835_DMA_CS); + } + + /* We'll un-pause when we set of our next DMA */ + if (!timeout) + return -ETIMEDOUT; + + if (!(cs & BCM2835_DMA_ACTIVE)) + return 0; + + /* Terminate the control block chain */ + writel(0, chan_base + BCM2835_DMA_NEXTCB); + + /* Abort the whole DMA */ + writel(BCM2835_DMA_ABORT | BCM2835_DMA_ACTIVE, + chan_base + BCM2835_DMA_CS); + + return 0; +} + +static void bcm2835_dma_start_desc(struct bcm2835_chan *c) +{ + struct virt_dma_desc *vd = vchan_next_desc(&c->vc); + struct bcm2835_desc *d; + + if (!vd) { + c->desc = NULL; + return; + } + + list_del(&vd->node); + + c->desc = d = to_bcm2835_dma_desc(&vd->tx); + + writel(d->control_block_base_phys, c->chan_base + BCM2835_DMA_ADDR); + writel(BCM2835_DMA_ACTIVE, c->chan_base + BCM2835_DMA_CS); +} + +static irqreturn_t bcm2835_dma_callback(int irq, void *data) +{ + struct bcm2835_chan *c = data; + struct bcm2835_desc *d; + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + + /* Acknowledge interrupt */ + writel(BCM2835_DMA_INT, c->chan_base + BCM2835_DMA_CS); + + d = c->desc; + + if (d) { + /* TODO Only works for cyclic DMA */ + vchan_cyclic_callback(&d->vd); + } + + /* Keep the DMA engine running */ + writel(BCM2835_DMA_ACTIVE, c->chan_base + BCM2835_DMA_CS); + + spin_unlock_irqrestore(&c->vc.lock, flags); + + return IRQ_HANDLED; +} + +static int bcm2835_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + + dev_dbg(c->vc.chan.device->dev, + "Allocating DMA channel %d\n", c->ch); + + return request_irq(c->irq_number, + bcm2835_dma_callback, 0, "DMA IRQ", c); +} + +static void bcm2835_dma_free_chan_resources(struct dma_chan *chan) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + + vchan_free_chan_resources(&c->vc); + free_irq(c->irq_number, c); + + dev_dbg(c->vc.chan.device->dev, "Freeing DMA channel %u\n", c->ch); +} + +static size_t bcm2835_dma_desc_size(struct bcm2835_desc *d) +{ + return d->size; +} + +static size_t bcm2835_dma_desc_size_pos(struct bcm2835_desc *d, dma_addr_t addr) +{ + unsigned int i; + size_t size; + + for (size = i = 0; i < d->frames; i++) { + struct bcm2835_dma_cb *control_block = + &d->control_block_base[i]; + size_t this_size = control_block->length; + dma_addr_t dma; + + if (d->dir == DMA_DEV_TO_MEM) + dma = control_block->dst; + else + dma = control_block->src; + + if (size) + size += this_size; + else if (addr >= dma && addr < dma + this_size) + size += dma + this_size - addr; + } + + return size; +} + +static enum dma_status bcm2835_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + struct virt_dma_desc *vd; + enum dma_status ret; + unsigned long flags; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE || !txstate) + return ret; + + spin_lock_irqsave(&c->vc.lock, flags); + vd = vchan_find_desc(&c->vc, cookie); + if (vd) { + txstate->residue = + bcm2835_dma_desc_size(to_bcm2835_dma_desc(&vd->tx)); + } else if (c->desc && c->desc->vd.tx.cookie == cookie) { + struct bcm2835_desc *d = c->desc; + dma_addr_t pos; + + if (d->dir == DMA_MEM_TO_DEV) + pos = readl(c->chan_base + BCM2835_DMA_SOURCE_AD); + else if (d->dir == DMA_DEV_TO_MEM) + pos = readl(c->chan_base + BCM2835_DMA_DEST_AD); + else + pos = 0; + + txstate->residue = bcm2835_dma_desc_size_pos(d, pos); + } else { + txstate->residue = 0; + } + + spin_unlock_irqrestore(&c->vc.lock, flags); + + return ret; +} + +static void bcm2835_dma_issue_pending(struct dma_chan *chan) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + unsigned long flags; + + c->cyclic = true; /* Nothing else is implemented */ + + spin_lock_irqsave(&c->vc.lock, flags); + if (vchan_issue_pending(&c->vc) && !c->desc) + bcm2835_dma_start_desc(c); + + spin_unlock_irqrestore(&c->vc.lock, flags); +} + +static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + enum dma_slave_buswidth dev_width; + struct bcm2835_desc *d; + dma_addr_t dev_addr; + unsigned int es, sync_type; + unsigned int frame; + + /* Grab configuration */ + if (!is_slave_direction(direction)) { + dev_err(chan->device->dev, "%s: bad direction?\n", __func__); + return NULL; + } + + if (direction == DMA_DEV_TO_MEM) { + dev_addr = c->cfg.src_addr; + dev_width = c->cfg.src_addr_width; + sync_type = BCM2835_DMA_S_DREQ; + } else { + dev_addr = c->cfg.dst_addr; + dev_width = c->cfg.dst_addr_width; + sync_type = BCM2835_DMA_D_DREQ; + } + + /* Bus width translates to the element size (ES) */ + switch (dev_width) { + case DMA_SLAVE_BUSWIDTH_4_BYTES: + es = BCM2835_DMA_DATA_TYPE_S32; + break; + default: + return NULL; + } + + /* Now allocate and setup the descriptor. */ + d = kzalloc(sizeof(*d), GFP_NOWAIT); + if (!d) + return NULL; + + d->dir = direction; + d->frames = buf_len / period_len; + + /* Allocate memory for control blocks */ + d->control_block_size = d->frames * sizeof(struct bcm2835_dma_cb); + d->control_block_base = dma_zalloc_coherent(chan->device->dev, + d->control_block_size, &d->control_block_base_phys, + GFP_NOWAIT); + + if (!d->control_block_base) { + kfree(d); + return NULL; + } + + /* + * Iterate over all frames, create a control block + * for each frame and link them together. + */ + for (frame = 0; frame < d->frames; frame++) { + struct bcm2835_dma_cb *control_block = + &d->control_block_base[frame]; + + /* Setup adresses */ + if (d->dir == DMA_DEV_TO_MEM) { + control_block->info = BCM2835_DMA_D_INC; + control_block->src = dev_addr; + control_block->dst = buf_addr + frame * period_len; + } else { + control_block->info = BCM2835_DMA_S_INC; + control_block->src = buf_addr + frame * period_len; + control_block->dst = dev_addr; + } + + /* Enable interrupt */ + control_block->info |= BCM2835_DMA_INT_EN; + + /* Setup synchronization */ + if (sync_type != 0) + control_block->info |= sync_type; + + /* Setup DREQ channel */ + if (c->dreq != 0) + control_block->info |= + BCM2835_DMA_PER_MAP(c->dreq); + + /* Length of a frame */ + control_block->length = period_len; + d->size += control_block->length; + + /* + * Next block is the next frame. + * This DMA engine driver currently only supports cyclic DMA. + * Therefore, wrap around at number of frames. + */ + control_block->next = d->control_block_base_phys + + sizeof(struct bcm2835_dma_cb) + * ((frame + 1) % d->frames); + } + + return vchan_tx_prep(&c->vc, &d->vd, flags); +} + +static int bcm2835_dma_slave_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + + if ((cfg->direction == DMA_DEV_TO_MEM && + cfg->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) || + (cfg->direction == DMA_MEM_TO_DEV && + cfg->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) || + !is_slave_direction(cfg->direction)) { + return -EINVAL; + } + + c->cfg = *cfg; + + return 0; +} + +static int bcm2835_dma_terminate_all(struct dma_chan *chan) +{ + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan); + struct bcm2835_dmadev *d = to_bcm2835_dma_dev(c->vc.chan.device); + unsigned long flags; + int timeout = 10000; + LIST_HEAD(head); + + spin_lock_irqsave(&c->vc.lock, flags); + + /* Prevent this channel being scheduled */ + spin_lock(&d->lock); + list_del_init(&c->node); + spin_unlock(&d->lock); + + /* + * Stop DMA activity: we assume the callback will not be called + * after bcm_dma_abort() returns (even if it does, it will see + * c->desc is NULL and exit.) + */ + if (c->desc) { + bcm2835_dma_desc_free(&c->desc->vd); + c->desc = NULL; + bcm2835_dma_abort(c->chan_base); + + /* Wait for stopping */ + while (--timeout) { + if (!(readl(c->chan_base + BCM2835_DMA_CS) & + BCM2835_DMA_ACTIVE)) + break; + + cpu_relax(); + } + + if (!timeout) + dev_err(d->ddev.dev, "DMA transfer could not be terminated\n"); + } + + vchan_get_all_descriptors(&c->vc, &head); + spin_unlock_irqrestore(&c->vc.lock, flags); + vchan_dma_desc_free_list(&c->vc, &head); + + return 0; +} + +static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id, int irq) +{ + struct bcm2835_chan *c; + + c = devm_kzalloc(d->ddev.dev, sizeof(*c), GFP_KERNEL); + if (!c) + return -ENOMEM; + + c->vc.desc_free = bcm2835_dma_desc_free; + vchan_init(&c->vc, &d->ddev); + INIT_LIST_HEAD(&c->node); + + c->chan_base = BCM2835_DMA_CHANIO(d->base, chan_id); + c->ch = chan_id; + c->irq_number = irq; + + return 0; +} + +static void bcm2835_dma_free(struct bcm2835_dmadev *od) +{ + struct bcm2835_chan *c, *next; + + list_for_each_entry_safe(c, next, &od->ddev.channels, + vc.chan.device_node) { + list_del(&c->vc.chan.device_node); + tasklet_kill(&c->vc.task); + } +} + +static const struct of_device_id bcm2835_dma_of_match[] = { + { .compatible = "brcm,bcm2835-dma", }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm2835_dma_of_match); + +static struct dma_chan *bcm2835_dma_xlate(struct of_phandle_args *spec, + struct of_dma *ofdma) +{ + struct bcm2835_dmadev *d = ofdma->of_dma_data; + struct dma_chan *chan; + + chan = dma_get_any_slave_channel(&d->ddev); + if (!chan) + return NULL; + + /* Set DREQ from param */ + to_bcm2835_dma_chan(chan)->dreq = spec->args[0]; + + return chan; +} + +static int bcm2835_dma_probe(struct platform_device *pdev) +{ + struct bcm2835_dmadev *od; + struct resource *res; + void __iomem *base; + int rc; + int i; + int irq; + uint32_t chans_available; + + if (!pdev->dev.dma_mask) + pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; + + rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + if (rc) + return rc; + + od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL); + if (!od) + return -ENOMEM; + + pdev->dev.dma_parms = &od->dma_parms; + dma_set_max_seg_size(&pdev->dev, 0x3FFFFFFF); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + od->base = base; + + dma_cap_set(DMA_SLAVE, od->ddev.cap_mask); + dma_cap_set(DMA_PRIVATE, od->ddev.cap_mask); + dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask); + od->ddev.device_alloc_chan_resources = bcm2835_dma_alloc_chan_resources; + od->ddev.device_free_chan_resources = bcm2835_dma_free_chan_resources; + od->ddev.device_tx_status = bcm2835_dma_tx_status; + od->ddev.device_issue_pending = bcm2835_dma_issue_pending; + od->ddev.device_prep_dma_cyclic = bcm2835_dma_prep_dma_cyclic; + od->ddev.device_config = bcm2835_dma_slave_config; + od->ddev.device_terminate_all = bcm2835_dma_terminate_all; + od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + od->ddev.dev = &pdev->dev; + INIT_LIST_HEAD(&od->ddev.channels); + spin_lock_init(&od->lock); + + platform_set_drvdata(pdev, od); + + /* Request DMA channel mask from device tree */ + if (of_property_read_u32(pdev->dev.of_node, + "brcm,dma-channel-mask", + &chans_available)) { + dev_err(&pdev->dev, "Failed to get channel mask\n"); + rc = -EINVAL; + goto err_no_dma; + } + + /* + * Do not use the FIQ and BULK channels, + * because they are used by the GPU. + */ + chans_available &= ~(BCM2835_DMA_FIQ_MASK | BCM2835_DMA_BULK_MASK); + + for (i = 0; i < pdev->num_resources; i++) { + irq = platform_get_irq(pdev, i); + if (irq < 0) + break; + + if (chans_available & (1 << i)) { + rc = bcm2835_dma_chan_init(od, i, irq); + if (rc) + goto err_no_dma; + } + } + + dev_dbg(&pdev->dev, "Initialized %i DMA channels\n", i); + + /* Device-tree DMA controller registration */ + rc = of_dma_controller_register(pdev->dev.of_node, + bcm2835_dma_xlate, od); + if (rc) { + dev_err(&pdev->dev, "Failed to register DMA controller\n"); + goto err_no_dma; + } + + rc = dma_async_device_register(&od->ddev); + if (rc) { + dev_err(&pdev->dev, + "Failed to register slave DMA engine device: %d\n", rc); + goto err_no_dma; + } + + dev_dbg(&pdev->dev, "Load BCM2835 DMA engine driver\n"); + + return 0; + +err_no_dma: + bcm2835_dma_free(od); + return rc; +} + +static int bcm2835_dma_remove(struct platform_device *pdev) +{ + struct bcm2835_dmadev *od = platform_get_drvdata(pdev); + + dma_async_device_unregister(&od->ddev); + bcm2835_dma_free(od); + + return 0; +} + +static struct platform_driver bcm2835_dma_driver = { + .probe = bcm2835_dma_probe, + .remove = bcm2835_dma_remove, + .driver = { + .name = "bcm2835-dma", + .of_match_table = of_match_ptr(bcm2835_dma_of_match), + }, +}; + +module_platform_driver(bcm2835_dma_driver); + +MODULE_ALIAS("platform:bcm2835-dma"); +MODULE_DESCRIPTION("BCM2835 DMA engine driver"); +MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/bestcomm/Kconfig b/drivers/dma/bestcomm/Kconfig new file mode 100644 index 000000000..29e427085 --- /dev/null +++ b/drivers/dma/bestcomm/Kconfig @@ -0,0 +1,36 @@ +# +# Kconfig options for Bestcomm +# + +config PPC_BESTCOMM + tristate "Bestcomm DMA engine support" + depends on PPC_MPC52xx + default n + select PPC_LIB_RHEAP + help + BestComm is the name of the communication coprocessor found + on the Freescale MPC5200 family of processor. Its usage is + optional for some drivers (like ATA), but required for + others (like FEC). + + If you want to use drivers that require DMA operations, + answer Y or M. Otherwise say N. + +config PPC_BESTCOMM_ATA + tristate + depends on PPC_BESTCOMM + help + This option enables the support for the ATA task. + +config PPC_BESTCOMM_FEC + tristate + depends on PPC_BESTCOMM + help + This option enables the support for the FEC tasks. + +config PPC_BESTCOMM_GEN_BD + tristate + depends on PPC_BESTCOMM + help + This option enables the support for the GenBD tasks. + diff --git a/drivers/dma/bestcomm/Makefile b/drivers/dma/bestcomm/Makefile new file mode 100644 index 000000000..aed2df2a6 --- /dev/null +++ b/drivers/dma/bestcomm/Makefile @@ -0,0 +1,14 @@ +# +# Makefile for BestComm & co +# + +bestcomm-core-objs := bestcomm.o sram.o +bestcomm-ata-objs := ata.o bcom_ata_task.o +bestcomm-fec-objs := fec.o bcom_fec_rx_task.o bcom_fec_tx_task.o +bestcomm-gen-bd-objs := gen_bd.o bcom_gen_bd_rx_task.o bcom_gen_bd_tx_task.o + +obj-$(CONFIG_PPC_BESTCOMM) += bestcomm-core.o +obj-$(CONFIG_PPC_BESTCOMM_ATA) += bestcomm-ata.o +obj-$(CONFIG_PPC_BESTCOMM_FEC) += bestcomm-fec.o +obj-$(CONFIG_PPC_BESTCOMM_GEN_BD) += bestcomm-gen-bd.o + diff --git a/drivers/dma/bestcomm/ata.c b/drivers/dma/bestcomm/ata.c new file mode 100644 index 000000000..2fd87f83c --- /dev/null +++ b/drivers/dma/bestcomm/ata.c @@ -0,0 +1,157 @@ +/* + * Bestcomm ATA task driver + * + * + * Patterned after bestcomm/fec.c by Dale Farnsworth <dfarnsworth@mvista.com> + * 2003-2004 (c) MontaVista, Software, Inc. + * + * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com> + * Copyright (C) 2006 Freescale - John Rigby + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <asm/io.h> + +#include <linux/fsl/bestcomm/bestcomm.h> +#include <linux/fsl/bestcomm/bestcomm_priv.h> +#include <linux/fsl/bestcomm/ata.h> + + +/* ======================================================================== */ +/* Task image/var/inc */ +/* ======================================================================== */ + +/* ata task image */ +extern u32 bcom_ata_task[]; + +/* ata task vars that need to be set before enabling the task */ +struct bcom_ata_var { + u32 enable; /* (u16*) address of task's control register */ + u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ + u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ + u32 bd_start; /* (struct bcom_bd*) current bd */ + u32 buffer_size; /* size of receive buffer */ +}; + +/* ata task incs that need to be set before enabling the task */ +struct bcom_ata_inc { + u16 pad0; + s16 incr_bytes; + u16 pad1; + s16 incr_dst; + u16 pad2; + s16 incr_src; +}; + + +/* ======================================================================== */ +/* Task support code */ +/* ======================================================================== */ + +struct bcom_task * +bcom_ata_init(int queue_len, int maxbufsize) +{ + struct bcom_task *tsk; + struct bcom_ata_var *var; + struct bcom_ata_inc *inc; + + /* Prefetch breaks ATA DMA. Turn it off for ATA DMA */ + bcom_disable_prefetch(); + + tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_ata_bd), 0); + if (!tsk) + return NULL; + + tsk->flags = BCOM_FLAGS_NONE; + + bcom_ata_reset_bd(tsk); + + var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum); + inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum); + + if (bcom_load_image(tsk->tasknum, bcom_ata_task)) { + bcom_task_free(tsk); + return NULL; + } + + var->enable = bcom_eng->regs_base + + offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); + var->bd_base = tsk->bd_pa; + var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); + var->bd_start = tsk->bd_pa; + var->buffer_size = maxbufsize; + + /* Configure some stuff */ + bcom_set_task_pragma(tsk->tasknum, BCOM_ATA_PRAGMA); + bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); + + out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_RX], BCOM_IPR_ATA_RX); + out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ATA_TX], BCOM_IPR_ATA_TX); + + out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ + + return tsk; +} +EXPORT_SYMBOL_GPL(bcom_ata_init); + +void bcom_ata_rx_prepare(struct bcom_task *tsk) +{ + struct bcom_ata_inc *inc; + + inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum); + + inc->incr_bytes = -(s16)sizeof(u32); + inc->incr_src = 0; + inc->incr_dst = sizeof(u32); + + bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_RX); +} +EXPORT_SYMBOL_GPL(bcom_ata_rx_prepare); + +void bcom_ata_tx_prepare(struct bcom_task *tsk) +{ + struct bcom_ata_inc *inc; + + inc = (struct bcom_ata_inc *) bcom_task_inc(tsk->tasknum); + + inc->incr_bytes = -(s16)sizeof(u32); + inc->incr_src = sizeof(u32); + inc->incr_dst = 0; + + bcom_set_initiator(tsk->tasknum, BCOM_INITIATOR_ATA_TX); +} +EXPORT_SYMBOL_GPL(bcom_ata_tx_prepare); + +void bcom_ata_reset_bd(struct bcom_task *tsk) +{ + struct bcom_ata_var *var; + + /* Reset all BD */ + memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); + + tsk->index = 0; + tsk->outdex = 0; + + var = (struct bcom_ata_var *) bcom_task_var(tsk->tasknum); + var->bd_start = var->bd_base; +} +EXPORT_SYMBOL_GPL(bcom_ata_reset_bd); + +void bcom_ata_release(struct bcom_task *tsk) +{ + /* Nothing special for the ATA tasks */ + bcom_task_free(tsk); +} +EXPORT_SYMBOL_GPL(bcom_ata_release); + + +MODULE_DESCRIPTION("BestComm ATA task driver"); +MODULE_AUTHOR("John Rigby"); +MODULE_LICENSE("GPL v2"); + diff --git a/drivers/dma/bestcomm/bcom_ata_task.c b/drivers/dma/bestcomm/bcom_ata_task.c new file mode 100644 index 000000000..cc6049a4e --- /dev/null +++ b/drivers/dma/bestcomm/bcom_ata_task.c @@ -0,0 +1,67 @@ +/* + * Bestcomm ATA task microcode + * + * Copyright (c) 2004 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Created based on bestcom/code_dma/image_rtos1/dma_image.hex + */ + +#include <asm/types.h> + +/* + * The header consists of the following fields: + * u32 magic; + * u8 desc_size; + * u8 var_size; + * u8 inc_size; + * u8 first_var; + * u8 reserved[8]; + * + * The size fields contain the number of 32-bit words. + */ + +u32 bcom_ata_task[] = { + /* header */ + 0x4243544b, + 0x0e060709, + 0x00000000, + 0x00000000, + + /* Task descriptors */ + 0x8198009b, /* LCD: idx0 = var3; idx0 <= var2; idx0 += inc3 */ + 0x13e00c08, /* DRD1A: var3 = var1; FN=0 MORE init=31 WS=0 RS=0 */ + 0xb8000264, /* LCD: idx1 = *idx0, idx2 = var0; idx1 < var9; idx1 += inc4, idx2 += inc4 */ + 0x10000f00, /* DRD1A: var3 = idx0; FN=0 MORE init=0 WS=0 RS=0 */ + 0x60140002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT init=0 WS=2 RS=2 */ + 0x0c8cfc8a, /* DRD2B1: *idx2 = EU3(); EU3(*idx2,var10) */ + 0xd8988240, /* LCDEXT: idx1 = idx1; idx1 > var9; idx1 += inc0 */ + 0xf845e011, /* LCDEXT: idx2 = *(idx0 + var00000015); ; idx2 += inc2 */ + 0xb845e00a, /* LCD: idx3 = *(idx0 + var00000019); ; idx3 += inc1 */ + 0x0bfecf90, /* DRD1A: *idx3 = *idx2; FN=0 TFD init=31 WS=3 RS=3 */ + 0x9898802d, /* LCD: idx1 = idx1; idx1 once var0; idx1 += inc5 */ + 0x64000005, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=5 INT EXT init=0 WS=0 RS=0 */ + 0x0c0cf849, /* DRD2B1: *idx0 = EU3(); EU3(idx1,var9) */ + 0x000001f8, /* NOP */ + + /* VAR[9]-VAR[14] */ + 0x40000000, + 0x7fff7fff, + 0x00000000, + 0x00000000, + 0x00000000, + 0x00000000, + + /* INC[0]-INC[6] */ + 0x40000000, + 0xe0000000, + 0xe0000000, + 0xa000000c, + 0x20000000, + 0x00000000, + 0x00000000, +}; + diff --git a/drivers/dma/bestcomm/bcom_fec_rx_task.c b/drivers/dma/bestcomm/bcom_fec_rx_task.c new file mode 100644 index 000000000..a1ad6a02f --- /dev/null +++ b/drivers/dma/bestcomm/bcom_fec_rx_task.c @@ -0,0 +1,78 @@ +/* + * Bestcomm FEC RX task microcode + * + * Copyright (c) 2004 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Automatically created based on BestCommAPI-2.2/code_dma/image_rtos1/dma_image.hex + * on Tue Mar 22 11:19:38 2005 GMT + */ + +#include <asm/types.h> + +/* + * The header consists of the following fields: + * u32 magic; + * u8 desc_size; + * u8 var_size; + * u8 inc_size; + * u8 first_var; + * u8 reserved[8]; + * + * The size fields contain the number of 32-bit words. + */ + +u32 bcom_fec_rx_task[] = { + /* header */ + 0x4243544b, + 0x18060709, + 0x00000000, + 0x00000000, + + /* Task descriptors */ + 0x808220e3, /* LCD: idx0 = var1, idx1 = var4; idx1 <= var3; idx0 += inc4, idx1 += inc3 */ + 0x10601010, /* DRD1A: var4 = var2; FN=0 MORE init=3 WS=0 RS=0 */ + 0xb8800264, /* LCD: idx2 = *idx1, idx3 = var0; idx2 < var9; idx2 += inc4, idx3 += inc4 */ + 0x10001308, /* DRD1A: var4 = idx1; FN=0 MORE init=0 WS=0 RS=0 */ + 0x60140002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT init=0 WS=2 RS=2 */ + 0x0cccfcca, /* DRD2B1: *idx3 = EU3(); EU3(*idx3,var10) */ + 0x80004000, /* LCDEXT: idx2 = 0x00000000; ; */ + 0xb8c58029, /* LCD: idx3 = *(idx1 + var00000015); idx3 once var0; idx3 += inc5 */ + 0x60000002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT init=0 WS=0 RS=0 */ + 0x088cf8cc, /* DRD2B1: idx2 = EU3(); EU3(idx3,var12) */ + 0x991982f2, /* LCD: idx2 = idx2, idx3 = idx3; idx2 > var11; idx2 += inc6, idx3 += inc2 */ + 0x006acf80, /* DRD1A: *idx3 = *idx0; FN=0 init=3 WS=1 RS=1 */ + 0x80004000, /* LCDEXT: idx2 = 0x00000000; ; */ + 0x9999802d, /* LCD: idx3 = idx3; idx3 once var0; idx3 += inc5 */ + 0x70000002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT MORE init=0 WS=0 RS=0 */ + 0x034cfc4e, /* DRD2B1: var13 = EU3(); EU3(*idx1,var14) */ + 0x00008868, /* DRD1A: idx2 = var13; FN=0 init=0 WS=0 RS=0 */ + 0x99198341, /* LCD: idx2 = idx2, idx3 = idx3; idx2 > var13; idx2 += inc0, idx3 += inc1 */ + 0x007ecf80, /* DRD1A: *idx3 = *idx0; FN=0 init=3 WS=3 RS=3 */ + 0x99198272, /* LCD: idx2 = idx2, idx3 = idx3; idx2 > var9; idx2 += inc6, idx3 += inc2 */ + 0x046acf80, /* DRD1A: *idx3 = *idx0; FN=0 INT init=3 WS=1 RS=1 */ + 0x9819002d, /* LCD: idx2 = idx0; idx2 once var0; idx2 += inc5 */ + 0x0060c790, /* DRD1A: *idx1 = *idx2; FN=0 init=3 WS=0 RS=0 */ + 0x000001f8, /* NOP */ + + /* VAR[9]-VAR[14] */ + 0x40000000, + 0x7fff7fff, + 0x00000000, + 0x00000003, + 0x40000008, + 0x43ffffff, + + /* INC[0]-INC[6] */ + 0x40000000, + 0xe0000000, + 0xe0000000, + 0xa0000008, + 0x20000000, + 0x00000000, + 0x4000ffff, +}; + diff --git a/drivers/dma/bestcomm/bcom_fec_tx_task.c b/drivers/dma/bestcomm/bcom_fec_tx_task.c new file mode 100644 index 000000000..b1c495c3a --- /dev/null +++ b/drivers/dma/bestcomm/bcom_fec_tx_task.c @@ -0,0 +1,91 @@ +/* + * Bestcomm FEC TX task microcode + * + * Copyright (c) 2004 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Automatically created based on BestCommAPI-2.2/code_dma/image_rtos1/dma_image.hex + * on Tue Mar 22 11:19:29 2005 GMT + */ + +#include <asm/types.h> + +/* + * The header consists of the following fields: + * u32 magic; + * u8 desc_size; + * u8 var_size; + * u8 inc_size; + * u8 first_var; + * u8 reserved[8]; + * + * The size fields contain the number of 32-bit words. + */ + +u32 bcom_fec_tx_task[] = { + /* header */ + 0x4243544b, + 0x2407070d, + 0x00000000, + 0x00000000, + + /* Task descriptors */ + 0x8018001b, /* LCD: idx0 = var0; idx0 <= var0; idx0 += inc3 */ + 0x60000005, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=5 EXT init=0 WS=0 RS=0 */ + 0x01ccfc0d, /* DRD2B1: var7 = EU3(); EU3(*idx0,var13) */ + 0x8082a123, /* LCD: idx0 = var1, idx1 = var5; idx1 <= var4; idx0 += inc4, idx1 += inc3 */ + 0x10801418, /* DRD1A: var5 = var3; FN=0 MORE init=4 WS=0 RS=0 */ + 0xf88103a4, /* LCDEXT: idx2 = *idx1, idx3 = var2; idx2 < var14; idx2 += inc4, idx3 += inc4 */ + 0x801a6024, /* LCD: idx4 = var0; ; idx4 += inc4 */ + 0x10001708, /* DRD1A: var5 = idx1; FN=0 MORE init=0 WS=0 RS=0 */ + 0x60140002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT init=0 WS=2 RS=2 */ + 0x0cccfccf, /* DRD2B1: *idx3 = EU3(); EU3(*idx3,var15) */ + 0x991a002c, /* LCD: idx2 = idx2, idx3 = idx4; idx2 once var0; idx2 += inc5, idx3 += inc4 */ + 0x70000002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT MORE init=0 WS=0 RS=0 */ + 0x024cfc4d, /* DRD2B1: var9 = EU3(); EU3(*idx1,var13) */ + 0x60000003, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=3 EXT init=0 WS=0 RS=0 */ + 0x0cccf247, /* DRD2B1: *idx3 = EU3(); EU3(var9,var7) */ + 0x80004000, /* LCDEXT: idx2 = 0x00000000; ; */ + 0xb8c80029, /* LCD: idx3 = *(idx1 + var0000001a); idx3 once var0; idx3 += inc5 */ + 0x70000002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT MORE init=0 WS=0 RS=0 */ + 0x088cf8d1, /* DRD2B1: idx2 = EU3(); EU3(idx3,var17) */ + 0x00002f10, /* DRD1A: var11 = idx2; FN=0 init=0 WS=0 RS=0 */ + 0x99198432, /* LCD: idx2 = idx2, idx3 = idx3; idx2 > var16; idx2 += inc6, idx3 += inc2 */ + 0x008ac398, /* DRD1A: *idx0 = *idx3; FN=0 init=4 WS=1 RS=1 */ + 0x80004000, /* LCDEXT: idx2 = 0x00000000; ; */ + 0x9999802d, /* LCD: idx3 = idx3; idx3 once var0; idx3 += inc5 */ + 0x70000002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT MORE init=0 WS=0 RS=0 */ + 0x048cfc53, /* DRD2B1: var18 = EU3(); EU3(*idx1,var19) */ + 0x60000008, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=8 EXT init=0 WS=0 RS=0 */ + 0x088cf48b, /* DRD2B1: idx2 = EU3(); EU3(var18,var11) */ + 0x99198481, /* LCD: idx2 = idx2, idx3 = idx3; idx2 > var18; idx2 += inc0, idx3 += inc1 */ + 0x009ec398, /* DRD1A: *idx0 = *idx3; FN=0 init=4 WS=3 RS=3 */ + 0x991983b2, /* LCD: idx2 = idx2, idx3 = idx3; idx2 > var14; idx2 += inc6, idx3 += inc2 */ + 0x088ac398, /* DRD1A: *idx0 = *idx3; FN=0 TFD init=4 WS=1 RS=1 */ + 0x9919002d, /* LCD: idx2 = idx2; idx2 once var0; idx2 += inc5 */ + 0x60000005, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=5 EXT init=0 WS=0 RS=0 */ + 0x0c4cf88e, /* DRD2B1: *idx1 = EU3(); EU3(idx2,var14) */ + 0x000001f8, /* NOP */ + + /* VAR[13]-VAR[19] */ + 0x0c000000, + 0x40000000, + 0x7fff7fff, + 0x00000000, + 0x00000003, + 0x40000004, + 0x43ffffff, + + /* INC[0]-INC[6] */ + 0x40000000, + 0xe0000000, + 0xe0000000, + 0xa0000008, + 0x20000000, + 0x00000000, + 0x4000ffff, +}; + diff --git a/drivers/dma/bestcomm/bcom_gen_bd_rx_task.c b/drivers/dma/bestcomm/bcom_gen_bd_rx_task.c new file mode 100644 index 000000000..efee022b0 --- /dev/null +++ b/drivers/dma/bestcomm/bcom_gen_bd_rx_task.c @@ -0,0 +1,63 @@ +/* + * Bestcomm GenBD RX task microcode + * + * Copyright (C) 2006 AppSpec Computer Technologies Corp. + * Jeff Gibbons <jeff.gibbons@appspec.com> + * Copyright (c) 2004 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Based on BestCommAPI-2.2/code_dma/image_rtos1/dma_image.hex + * on Tue Mar 4 10:14:12 2006 GMT + * + */ + +#include <asm/types.h> + +/* + * The header consists of the following fields: + * u32 magic; + * u8 desc_size; + * u8 var_size; + * u8 inc_size; + * u8 first_var; + * u8 reserved[8]; + * + * The size fields contain the number of 32-bit words. + */ + +u32 bcom_gen_bd_rx_task[] = { + /* header */ + 0x4243544b, + 0x0d020409, + 0x00000000, + 0x00000000, + + /* Task descriptors */ + 0x808220da, /* LCD: idx0 = var1, idx1 = var4; idx1 <= var3; idx0 += inc3, idx1 += inc2 */ + 0x13e01010, /* DRD1A: var4 = var2; FN=0 MORE init=31 WS=0 RS=0 */ + 0xb880025b, /* LCD: idx2 = *idx1, idx3 = var0; idx2 < var9; idx2 += inc3, idx3 += inc3 */ + 0x10001308, /* DRD1A: var4 = idx1; FN=0 MORE init=0 WS=0 RS=0 */ + 0x60140002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT init=0 WS=2 RS=2 */ + 0x0cccfcca, /* DRD2B1: *idx3 = EU3(); EU3(*idx3,var10) */ + 0xd9190240, /* LCDEXT: idx2 = idx2; idx2 > var9; idx2 += inc0 */ + 0xb8c5e009, /* LCD: idx3 = *(idx1 + var00000015); ; idx3 += inc1 */ + 0x07fecf80, /* DRD1A: *idx3 = *idx0; FN=0 INT init=31 WS=3 RS=3 */ + 0x99190024, /* LCD: idx2 = idx2; idx2 once var0; idx2 += inc4 */ + 0x60000005, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=5 EXT init=0 WS=0 RS=0 */ + 0x0c4cf889, /* DRD2B1: *idx1 = EU3(); EU3(idx2,var9) */ + 0x000001f8, /* NOP */ + + /* VAR[9]-VAR[10] */ + 0x40000000, + 0x7fff7fff, + + /* INC[0]-INC[3] */ + 0x40000000, + 0xe0000000, + 0xa0000008, + 0x20000000, +}; + diff --git a/drivers/dma/bestcomm/bcom_gen_bd_tx_task.c b/drivers/dma/bestcomm/bcom_gen_bd_tx_task.c new file mode 100644 index 000000000..c605aa42e --- /dev/null +++ b/drivers/dma/bestcomm/bcom_gen_bd_tx_task.c @@ -0,0 +1,69 @@ +/* + * Bestcomm GenBD TX task microcode + * + * Copyright (C) 2006 AppSpec Computer Technologies Corp. + * Jeff Gibbons <jeff.gibbons@appspec.com> + * Copyright (c) 2004 Freescale Semiconductor, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + * Based on BestCommAPI-2.2/code_dma/image_rtos1/dma_image.hex + * on Tue Mar 4 10:14:12 2006 GMT + * + */ + +#include <asm/types.h> + +/* + * The header consists of the following fields: + * u32 magic; + * u8 desc_size; + * u8 var_size; + * u8 inc_size; + * u8 first_var; + * u8 reserved[8]; + * + * The size fields contain the number of 32-bit words. + */ + +u32 bcom_gen_bd_tx_task[] = { + /* header */ + 0x4243544b, + 0x0f040609, + 0x00000000, + 0x00000000, + + /* Task descriptors */ + 0x800220e3, /* LCD: idx0 = var0, idx1 = var4; idx1 <= var3; idx0 += inc4, idx1 += inc3 */ + 0x13e01010, /* DRD1A: var4 = var2; FN=0 MORE init=31 WS=0 RS=0 */ + 0xb8808264, /* LCD: idx2 = *idx1, idx3 = var1; idx2 < var9; idx2 += inc4, idx3 += inc4 */ + 0x10001308, /* DRD1A: var4 = idx1; FN=0 MORE init=0 WS=0 RS=0 */ + 0x60140002, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=2 EXT init=0 WS=2 RS=2 */ + 0x0cccfcca, /* DRD2B1: *idx3 = EU3(); EU3(*idx3,var10) */ + 0xd9190300, /* LCDEXT: idx2 = idx2; idx2 > var12; idx2 += inc0 */ + 0xb8c5e009, /* LCD: idx3 = *(idx1 + var00000015); ; idx3 += inc1 */ + 0x03fec398, /* DRD1A: *idx0 = *idx3; FN=0 init=31 WS=3 RS=3 */ + 0x9919826a, /* LCD: idx2 = idx2, idx3 = idx3; idx2 > var9; idx2 += inc5, idx3 += inc2 */ + 0x0feac398, /* DRD1A: *idx0 = *idx3; FN=0 TFD INT init=31 WS=1 RS=1 */ + 0x99190036, /* LCD: idx2 = idx2; idx2 once var0; idx2 += inc6 */ + 0x60000005, /* DRD2A: EU0=0 EU1=0 EU2=0 EU3=5 EXT init=0 WS=0 RS=0 */ + 0x0c4cf889, /* DRD2B1: *idx1 = EU3(); EU3(idx2,var9) */ + 0x000001f8, /* NOP */ + + /* VAR[9]-VAR[12] */ + 0x40000000, + 0x7fff7fff, + 0x00000000, + 0x40000004, + + /* INC[0]-INC[5] */ + 0x40000000, + 0xe0000000, + 0xe0000000, + 0xa0000008, + 0x20000000, + 0x4000ffff, +}; + diff --git a/drivers/dma/bestcomm/bestcomm.c b/drivers/dma/bestcomm/bestcomm.c new file mode 100644 index 000000000..180fedb41 --- /dev/null +++ b/drivers/dma/bestcomm/bestcomm.c @@ -0,0 +1,530 @@ +/* + * Driver for MPC52xx processor BestComm peripheral controller + * + * + * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com> + * Copyright (C) 2005 Varma Electronics Oy, + * ( by Andrey Volkov <avolkov@varma-el.com> ) + * Copyright (C) 2003-2004 MontaVista, Software, Inc. + * ( by Dale Farnsworth <dfarnsworth@mvista.com> ) + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <asm/io.h> +#include <asm/irq.h> +#include <asm/mpc52xx.h> + +#include <linux/fsl/bestcomm/sram.h> +#include <linux/fsl/bestcomm/bestcomm_priv.h> +#include "linux/fsl/bestcomm/bestcomm.h" + +#define DRIVER_NAME "bestcomm-core" + +/* MPC5200 device tree match tables */ +static const struct of_device_id mpc52xx_sram_ids[] = { + { .compatible = "fsl,mpc5200-sram", }, + { .compatible = "mpc5200-sram", }, + {} +}; + + +struct bcom_engine *bcom_eng = NULL; +EXPORT_SYMBOL_GPL(bcom_eng); /* needed for inline functions */ + +/* ======================================================================== */ +/* Public and private API */ +/* ======================================================================== */ + +/* Private API */ + +struct bcom_task * +bcom_task_alloc(int bd_count, int bd_size, int priv_size) +{ + int i, tasknum = -1; + struct bcom_task *tsk; + + /* Don't try to do anything if bestcomm init failed */ + if (!bcom_eng) + return NULL; + + /* Get and reserve a task num */ + spin_lock(&bcom_eng->lock); + + for (i=0; i<BCOM_MAX_TASKS; i++) + if (!bcom_eng->tdt[i].stop) { /* we use stop as a marker */ + bcom_eng->tdt[i].stop = 0xfffffffful; /* dummy addr */ + tasknum = i; + break; + } + + spin_unlock(&bcom_eng->lock); + + if (tasknum < 0) + return NULL; + + /* Allocate our structure */ + tsk = kzalloc(sizeof(struct bcom_task) + priv_size, GFP_KERNEL); + if (!tsk) + goto error; + + tsk->tasknum = tasknum; + if (priv_size) + tsk->priv = (void*)tsk + sizeof(struct bcom_task); + + /* Get IRQ of that task */ + tsk->irq = irq_of_parse_and_map(bcom_eng->ofnode, tsk->tasknum); + if (tsk->irq == NO_IRQ) + goto error; + + /* Init the BDs, if needed */ + if (bd_count) { + tsk->cookie = kmalloc(sizeof(void*) * bd_count, GFP_KERNEL); + if (!tsk->cookie) + goto error; + + tsk->bd = bcom_sram_alloc(bd_count * bd_size, 4, &tsk->bd_pa); + if (!tsk->bd) + goto error; + memset(tsk->bd, 0x00, bd_count * bd_size); + + tsk->num_bd = bd_count; + tsk->bd_size = bd_size; + } + + return tsk; + +error: + if (tsk) { + if (tsk->irq != NO_IRQ) + irq_dispose_mapping(tsk->irq); + bcom_sram_free(tsk->bd); + kfree(tsk->cookie); + kfree(tsk); + } + + bcom_eng->tdt[tasknum].stop = 0; + + return NULL; +} +EXPORT_SYMBOL_GPL(bcom_task_alloc); + +void +bcom_task_free(struct bcom_task *tsk) +{ + /* Stop the task */ + bcom_disable_task(tsk->tasknum); + + /* Clear TDT */ + bcom_eng->tdt[tsk->tasknum].start = 0; + bcom_eng->tdt[tsk->tasknum].stop = 0; + + /* Free everything */ + irq_dispose_mapping(tsk->irq); + bcom_sram_free(tsk->bd); + kfree(tsk->cookie); + kfree(tsk); +} +EXPORT_SYMBOL_GPL(bcom_task_free); + +int +bcom_load_image(int task, u32 *task_image) +{ + struct bcom_task_header *hdr = (struct bcom_task_header *)task_image; + struct bcom_tdt *tdt; + u32 *desc, *var, *inc; + u32 *desc_src, *var_src, *inc_src; + + /* Safety checks */ + if (hdr->magic != BCOM_TASK_MAGIC) { + printk(KERN_ERR DRIVER_NAME + ": Trying to load invalid microcode\n"); + return -EINVAL; + } + + if ((task < 0) || (task >= BCOM_MAX_TASKS)) { + printk(KERN_ERR DRIVER_NAME + ": Trying to load invalid task %d\n", task); + return -EINVAL; + } + + /* Initial load or reload */ + tdt = &bcom_eng->tdt[task]; + + if (tdt->start) { + desc = bcom_task_desc(task); + if (hdr->desc_size != bcom_task_num_descs(task)) { + printk(KERN_ERR DRIVER_NAME + ": Trying to reload wrong task image " + "(%d size %d/%d)!\n", + task, + hdr->desc_size, + bcom_task_num_descs(task)); + return -EINVAL; + } + } else { + phys_addr_t start_pa; + + desc = bcom_sram_alloc(hdr->desc_size * sizeof(u32), 4, &start_pa); + if (!desc) + return -ENOMEM; + + tdt->start = start_pa; + tdt->stop = start_pa + ((hdr->desc_size-1) * sizeof(u32)); + } + + var = bcom_task_var(task); + inc = bcom_task_inc(task); + + /* Clear & copy */ + memset(var, 0x00, BCOM_VAR_SIZE); + memset(inc, 0x00, BCOM_INC_SIZE); + + desc_src = (u32 *)(hdr + 1); + var_src = desc_src + hdr->desc_size; + inc_src = var_src + hdr->var_size; + + memcpy(desc, desc_src, hdr->desc_size * sizeof(u32)); + memcpy(var + hdr->first_var, var_src, hdr->var_size * sizeof(u32)); + memcpy(inc, inc_src, hdr->inc_size * sizeof(u32)); + + return 0; +} +EXPORT_SYMBOL_GPL(bcom_load_image); + +void +bcom_set_initiator(int task, int initiator) +{ + int i; + int num_descs; + u32 *desc; + int next_drd_has_initiator; + + bcom_set_tcr_initiator(task, initiator); + + /* Just setting tcr is apparently not enough due to some problem */ + /* with it. So we just go thru all the microcode and replace in */ + /* the DRD directly */ + + desc = bcom_task_desc(task); + next_drd_has_initiator = 1; + num_descs = bcom_task_num_descs(task); + + for (i=0; i<num_descs; i++, desc++) { + if (!bcom_desc_is_drd(*desc)) + continue; + if (next_drd_has_initiator) + if (bcom_desc_initiator(*desc) != BCOM_INITIATOR_ALWAYS) + bcom_set_desc_initiator(desc, initiator); + next_drd_has_initiator = !bcom_drd_is_extended(*desc); + } +} +EXPORT_SYMBOL_GPL(bcom_set_initiator); + + +/* Public API */ + +void +bcom_enable(struct bcom_task *tsk) +{ + bcom_enable_task(tsk->tasknum); +} +EXPORT_SYMBOL_GPL(bcom_enable); + +void +bcom_disable(struct bcom_task *tsk) +{ + bcom_disable_task(tsk->tasknum); +} +EXPORT_SYMBOL_GPL(bcom_disable); + + +/* ======================================================================== */ +/* Engine init/cleanup */ +/* ======================================================================== */ + +/* Function Descriptor table */ +/* this will need to be updated if Freescale changes their task code FDT */ +static u32 fdt_ops[] = { + 0xa0045670, /* FDT[48] - load_acc() */ + 0x80045670, /* FDT[49] - unload_acc() */ + 0x21800000, /* FDT[50] - and() */ + 0x21e00000, /* FDT[51] - or() */ + 0x21500000, /* FDT[52] - xor() */ + 0x21400000, /* FDT[53] - andn() */ + 0x21500000, /* FDT[54] - not() */ + 0x20400000, /* FDT[55] - add() */ + 0x20500000, /* FDT[56] - sub() */ + 0x20800000, /* FDT[57] - lsh() */ + 0x20a00000, /* FDT[58] - rsh() */ + 0xc0170000, /* FDT[59] - crc8() */ + 0xc0145670, /* FDT[60] - crc16() */ + 0xc0345670, /* FDT[61] - crc32() */ + 0xa0076540, /* FDT[62] - endian32() */ + 0xa0000760, /* FDT[63] - endian16() */ +}; + + +static int bcom_engine_init(void) +{ + int task; + phys_addr_t tdt_pa, ctx_pa, var_pa, fdt_pa; + unsigned int tdt_size, ctx_size, var_size, fdt_size; + + /* Allocate & clear SRAM zones for FDT, TDTs, contexts and vars/incs */ + tdt_size = BCOM_MAX_TASKS * sizeof(struct bcom_tdt); + ctx_size = BCOM_MAX_TASKS * BCOM_CTX_SIZE; + var_size = BCOM_MAX_TASKS * (BCOM_VAR_SIZE + BCOM_INC_SIZE); + fdt_size = BCOM_FDT_SIZE; + + bcom_eng->tdt = bcom_sram_alloc(tdt_size, sizeof(u32), &tdt_pa); + bcom_eng->ctx = bcom_sram_alloc(ctx_size, BCOM_CTX_ALIGN, &ctx_pa); + bcom_eng->var = bcom_sram_alloc(var_size, BCOM_VAR_ALIGN, &var_pa); + bcom_eng->fdt = bcom_sram_alloc(fdt_size, BCOM_FDT_ALIGN, &fdt_pa); + + if (!bcom_eng->tdt || !bcom_eng->ctx || !bcom_eng->var || !bcom_eng->fdt) { + printk(KERN_ERR "DMA: SRAM alloc failed in engine init !\n"); + + bcom_sram_free(bcom_eng->tdt); + bcom_sram_free(bcom_eng->ctx); + bcom_sram_free(bcom_eng->var); + bcom_sram_free(bcom_eng->fdt); + + return -ENOMEM; + } + + memset(bcom_eng->tdt, 0x00, tdt_size); + memset(bcom_eng->ctx, 0x00, ctx_size); + memset(bcom_eng->var, 0x00, var_size); + memset(bcom_eng->fdt, 0x00, fdt_size); + + /* Copy the FDT for the EU#3 */ + memcpy(&bcom_eng->fdt[48], fdt_ops, sizeof(fdt_ops)); + + /* Initialize Task base structure */ + for (task=0; task<BCOM_MAX_TASKS; task++) + { + out_be16(&bcom_eng->regs->tcr[task], 0); + out_8(&bcom_eng->regs->ipr[task], 0); + + bcom_eng->tdt[task].context = ctx_pa; + bcom_eng->tdt[task].var = var_pa; + bcom_eng->tdt[task].fdt = fdt_pa; + + var_pa += BCOM_VAR_SIZE + BCOM_INC_SIZE; + ctx_pa += BCOM_CTX_SIZE; + } + + out_be32(&bcom_eng->regs->taskBar, tdt_pa); + + /* Init 'always' initiator */ + out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_ALWAYS], BCOM_IPR_ALWAYS); + + /* Disable COMM Bus Prefetch on the original 5200; it's broken */ + if ((mfspr(SPRN_SVR) & MPC5200_SVR_MASK) == MPC5200_SVR) + bcom_disable_prefetch(); + + /* Init lock */ + spin_lock_init(&bcom_eng->lock); + + return 0; +} + +static void +bcom_engine_cleanup(void) +{ + int task; + + /* Stop all tasks */ + for (task=0; task<BCOM_MAX_TASKS; task++) + { + out_be16(&bcom_eng->regs->tcr[task], 0); + out_8(&bcom_eng->regs->ipr[task], 0); + } + + out_be32(&bcom_eng->regs->taskBar, 0ul); + + /* Release the SRAM zones */ + bcom_sram_free(bcom_eng->tdt); + bcom_sram_free(bcom_eng->ctx); + bcom_sram_free(bcom_eng->var); + bcom_sram_free(bcom_eng->fdt); +} + + +/* ======================================================================== */ +/* OF platform driver */ +/* ======================================================================== */ + +static int mpc52xx_bcom_probe(struct platform_device *op) +{ + struct device_node *ofn_sram; + struct resource res_bcom; + + int rv; + + /* Inform user we're ok so far */ + printk(KERN_INFO "DMA: MPC52xx BestComm driver\n"); + + /* Get the bestcomm node */ + of_node_get(op->dev.of_node); + + /* Prepare SRAM */ + ofn_sram = of_find_matching_node(NULL, mpc52xx_sram_ids); + if (!ofn_sram) { + printk(KERN_ERR DRIVER_NAME ": " + "No SRAM found in device tree\n"); + rv = -ENODEV; + goto error_ofput; + } + rv = bcom_sram_init(ofn_sram, DRIVER_NAME); + of_node_put(ofn_sram); + + if (rv) { + printk(KERN_ERR DRIVER_NAME ": " + "Error in SRAM init\n"); + goto error_ofput; + } + + /* Get a clean struct */ + bcom_eng = kzalloc(sizeof(struct bcom_engine), GFP_KERNEL); + if (!bcom_eng) { + printk(KERN_ERR DRIVER_NAME ": " + "Can't allocate state structure\n"); + rv = -ENOMEM; + goto error_sramclean; + } + + /* Save the node */ + bcom_eng->ofnode = op->dev.of_node; + + /* Get, reserve & map io */ + if (of_address_to_resource(op->dev.of_node, 0, &res_bcom)) { + printk(KERN_ERR DRIVER_NAME ": " + "Can't get resource\n"); + rv = -EINVAL; + goto error_sramclean; + } + + if (!request_mem_region(res_bcom.start, resource_size(&res_bcom), + DRIVER_NAME)) { + printk(KERN_ERR DRIVER_NAME ": " + "Can't request registers region\n"); + rv = -EBUSY; + goto error_sramclean; + } + + bcom_eng->regs_base = res_bcom.start; + bcom_eng->regs = ioremap(res_bcom.start, sizeof(struct mpc52xx_sdma)); + if (!bcom_eng->regs) { + printk(KERN_ERR DRIVER_NAME ": " + "Can't map registers\n"); + rv = -ENOMEM; + goto error_release; + } + + /* Now, do the real init */ + rv = bcom_engine_init(); + if (rv) + goto error_unmap; + + /* Done ! */ + printk(KERN_INFO "DMA: MPC52xx BestComm engine @%08lx ok !\n", + (long)bcom_eng->regs_base); + + return 0; + + /* Error path */ +error_unmap: + iounmap(bcom_eng->regs); +error_release: + release_mem_region(res_bcom.start, sizeof(struct mpc52xx_sdma)); +error_sramclean: + kfree(bcom_eng); + bcom_sram_cleanup(); +error_ofput: + of_node_put(op->dev.of_node); + + printk(KERN_ERR "DMA: MPC52xx BestComm init failed !\n"); + + return rv; +} + + +static int mpc52xx_bcom_remove(struct platform_device *op) +{ + /* Clean up the engine */ + bcom_engine_cleanup(); + + /* Cleanup SRAM */ + bcom_sram_cleanup(); + + /* Release regs */ + iounmap(bcom_eng->regs); + release_mem_region(bcom_eng->regs_base, sizeof(struct mpc52xx_sdma)); + + /* Release the node */ + of_node_put(bcom_eng->ofnode); + + /* Release memory */ + kfree(bcom_eng); + bcom_eng = NULL; + + return 0; +} + +static const struct of_device_id mpc52xx_bcom_of_match[] = { + { .compatible = "fsl,mpc5200-bestcomm", }, + { .compatible = "mpc5200-bestcomm", }, + {}, +}; + +MODULE_DEVICE_TABLE(of, mpc52xx_bcom_of_match); + + +static struct platform_driver mpc52xx_bcom_of_platform_driver = { + .probe = mpc52xx_bcom_probe, + .remove = mpc52xx_bcom_remove, + .driver = { + .name = DRIVER_NAME, + .of_match_table = mpc52xx_bcom_of_match, + }, +}; + + +/* ======================================================================== */ +/* Module */ +/* ======================================================================== */ + +static int __init +mpc52xx_bcom_init(void) +{ + return platform_driver_register(&mpc52xx_bcom_of_platform_driver); +} + +static void __exit +mpc52xx_bcom_exit(void) +{ + platform_driver_unregister(&mpc52xx_bcom_of_platform_driver); +} + +/* If we're not a module, we must make sure everything is setup before */ +/* anyone tries to use us ... that's why we use subsys_initcall instead */ +/* of module_init. */ +subsys_initcall(mpc52xx_bcom_init); +module_exit(mpc52xx_bcom_exit); + +MODULE_DESCRIPTION("Freescale MPC52xx BestComm DMA"); +MODULE_AUTHOR("Sylvain Munaut <tnt@246tNt.com>"); +MODULE_AUTHOR("Andrey Volkov <avolkov@varma-el.com>"); +MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>"); +MODULE_LICENSE("GPL v2"); + diff --git a/drivers/dma/bestcomm/fec.c b/drivers/dma/bestcomm/fec.c new file mode 100644 index 000000000..7f1fb1c99 --- /dev/null +++ b/drivers/dma/bestcomm/fec.c @@ -0,0 +1,270 @@ +/* + * Bestcomm FEC tasks driver + * + * + * Copyright (C) 2006-2007 Sylvain Munaut <tnt@246tNt.com> + * Copyright (C) 2003-2004 MontaVista, Software, Inc. + * ( by Dale Farnsworth <dfarnsworth@mvista.com> ) + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/types.h> +#include <asm/io.h> + +#include <linux/fsl/bestcomm/bestcomm.h> +#include <linux/fsl/bestcomm/bestcomm_priv.h> +#include <linux/fsl/bestcomm/fec.h> + + +/* ======================================================================== */ +/* Task image/var/inc */ +/* ======================================================================== */ + +/* fec tasks images */ +extern u32 bcom_fec_rx_task[]; +extern u32 bcom_fec_tx_task[]; + +/* rx task vars that need to be set before enabling the task */ +struct bcom_fec_rx_var { + u32 enable; /* (u16*) address of task's control register */ + u32 fifo; /* (u32*) address of fec's fifo */ + u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ + u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ + u32 bd_start; /* (struct bcom_bd*) current bd */ + u32 buffer_size; /* size of receive buffer */ +}; + +/* rx task incs that need to be set before enabling the task */ +struct bcom_fec_rx_inc { + u16 pad0; + s16 incr_bytes; + u16 pad1; + s16 incr_dst; + u16 pad2; + s16 incr_dst_ma; +}; + +/* tx task vars that need to be set before enabling the task */ +struct bcom_fec_tx_var { + u32 DRD; /* (u32*) address of self-modified DRD */ + u32 fifo; /* (u32*) address of fec's fifo */ + u32 enable; /* (u16*) address of task's control register */ + u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ + u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ + u32 bd_start; /* (struct bcom_bd*) current bd */ + u32 buffer_size; /* set by uCode for each packet */ +}; + +/* tx task incs that need to be set before enabling the task */ +struct bcom_fec_tx_inc { + u16 pad0; + s16 incr_bytes; + u16 pad1; + s16 incr_src; + u16 pad2; + s16 incr_src_ma; +}; + +/* private structure in the task */ +struct bcom_fec_priv { + phys_addr_t fifo; + int maxbufsize; +}; + + +/* ======================================================================== */ +/* Task support code */ +/* ======================================================================== */ + +struct bcom_task * +bcom_fec_rx_init(int queue_len, phys_addr_t fifo, int maxbufsize) +{ + struct bcom_task *tsk; + struct bcom_fec_priv *priv; + + tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd), + sizeof(struct bcom_fec_priv)); + if (!tsk) + return NULL; + + tsk->flags = BCOM_FLAGS_NONE; + + priv = tsk->priv; + priv->fifo = fifo; + priv->maxbufsize = maxbufsize; + + if (bcom_fec_rx_reset(tsk)) { + bcom_task_free(tsk); + return NULL; + } + + return tsk; +} +EXPORT_SYMBOL_GPL(bcom_fec_rx_init); + +int +bcom_fec_rx_reset(struct bcom_task *tsk) +{ + struct bcom_fec_priv *priv = tsk->priv; + struct bcom_fec_rx_var *var; + struct bcom_fec_rx_inc *inc; + + /* Shutdown the task */ + bcom_disable_task(tsk->tasknum); + + /* Reset the microcode */ + var = (struct bcom_fec_rx_var *) bcom_task_var(tsk->tasknum); + inc = (struct bcom_fec_rx_inc *) bcom_task_inc(tsk->tasknum); + + if (bcom_load_image(tsk->tasknum, bcom_fec_rx_task)) + return -1; + + var->enable = bcom_eng->regs_base + + offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); + var->fifo = (u32) priv->fifo; + var->bd_base = tsk->bd_pa; + var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); + var->bd_start = tsk->bd_pa; + var->buffer_size = priv->maxbufsize; + + inc->incr_bytes = -(s16)sizeof(u32); /* These should be in the */ + inc->incr_dst = sizeof(u32); /* task image, but we stick */ + inc->incr_dst_ma= sizeof(u8); /* to the official ones */ + + /* Reset the BDs */ + tsk->index = 0; + tsk->outdex = 0; + + memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); + + /* Configure some stuff */ + bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_RX_BD_PRAGMA); + bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); + + out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_RX], BCOM_IPR_FEC_RX); + + out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ + + return 0; +} +EXPORT_SYMBOL_GPL(bcom_fec_rx_reset); + +void +bcom_fec_rx_release(struct bcom_task *tsk) +{ + /* Nothing special for the FEC tasks */ + bcom_task_free(tsk); +} +EXPORT_SYMBOL_GPL(bcom_fec_rx_release); + + + + /* Return 2nd to last DRD */ + /* This is an ugly hack, but at least it's only done + once at initialization */ +static u32 *self_modified_drd(int tasknum) +{ + u32 *desc; + int num_descs; + int drd_count; + int i; + + num_descs = bcom_task_num_descs(tasknum); + desc = bcom_task_desc(tasknum) + num_descs - 1; + drd_count = 0; + for (i=0; i<num_descs; i++, desc--) + if (bcom_desc_is_drd(*desc) && ++drd_count == 3) + break; + return desc; +} + +struct bcom_task * +bcom_fec_tx_init(int queue_len, phys_addr_t fifo) +{ + struct bcom_task *tsk; + struct bcom_fec_priv *priv; + + tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_fec_bd), + sizeof(struct bcom_fec_priv)); + if (!tsk) + return NULL; + + tsk->flags = BCOM_FLAGS_ENABLE_TASK; + + priv = tsk->priv; + priv->fifo = fifo; + + if (bcom_fec_tx_reset(tsk)) { + bcom_task_free(tsk); + return NULL; + } + + return tsk; +} +EXPORT_SYMBOL_GPL(bcom_fec_tx_init); + +int +bcom_fec_tx_reset(struct bcom_task *tsk) +{ + struct bcom_fec_priv *priv = tsk->priv; + struct bcom_fec_tx_var *var; + struct bcom_fec_tx_inc *inc; + + /* Shutdown the task */ + bcom_disable_task(tsk->tasknum); + + /* Reset the microcode */ + var = (struct bcom_fec_tx_var *) bcom_task_var(tsk->tasknum); + inc = (struct bcom_fec_tx_inc *) bcom_task_inc(tsk->tasknum); + + if (bcom_load_image(tsk->tasknum, bcom_fec_tx_task)) + return -1; + + var->enable = bcom_eng->regs_base + + offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); + var->fifo = (u32) priv->fifo; + var->DRD = bcom_sram_va2pa(self_modified_drd(tsk->tasknum)); + var->bd_base = tsk->bd_pa; + var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); + var->bd_start = tsk->bd_pa; + + inc->incr_bytes = -(s16)sizeof(u32); /* These should be in the */ + inc->incr_src = sizeof(u32); /* task image, but we stick */ + inc->incr_src_ma= sizeof(u8); /* to the official ones */ + + /* Reset the BDs */ + tsk->index = 0; + tsk->outdex = 0; + + memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); + + /* Configure some stuff */ + bcom_set_task_pragma(tsk->tasknum, BCOM_FEC_TX_BD_PRAGMA); + bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); + + out_8(&bcom_eng->regs->ipr[BCOM_INITIATOR_FEC_TX], BCOM_IPR_FEC_TX); + + out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ + + return 0; +} +EXPORT_SYMBOL_GPL(bcom_fec_tx_reset); + +void +bcom_fec_tx_release(struct bcom_task *tsk) +{ + /* Nothing special for the FEC tasks */ + bcom_task_free(tsk); +} +EXPORT_SYMBOL_GPL(bcom_fec_tx_release); + + +MODULE_DESCRIPTION("BestComm FEC tasks driver"); +MODULE_AUTHOR("Dale Farnsworth <dfarnsworth@mvista.com>"); +MODULE_LICENSE("GPL v2"); + diff --git a/drivers/dma/bestcomm/gen_bd.c b/drivers/dma/bestcomm/gen_bd.c new file mode 100644 index 000000000..1a5b22d88 --- /dev/null +++ b/drivers/dma/bestcomm/gen_bd.c @@ -0,0 +1,354 @@ +/* + * Driver for MPC52xx processor BestComm General Buffer Descriptor + * + * Copyright (C) 2007 Sylvain Munaut <tnt@246tNt.com> + * Copyright (C) 2006 AppSpec Computer Technologies Corp. + * Jeff Gibbons <jeff.gibbons@appspec.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/types.h> +#include <asm/errno.h> +#include <asm/io.h> + +#include <asm/mpc52xx.h> +#include <asm/mpc52xx_psc.h> + +#include <linux/fsl/bestcomm/bestcomm.h> +#include <linux/fsl/bestcomm/bestcomm_priv.h> +#include <linux/fsl/bestcomm/gen_bd.h> + + +/* ======================================================================== */ +/* Task image/var/inc */ +/* ======================================================================== */ + +/* gen_bd tasks images */ +extern u32 bcom_gen_bd_rx_task[]; +extern u32 bcom_gen_bd_tx_task[]; + +/* rx task vars that need to be set before enabling the task */ +struct bcom_gen_bd_rx_var { + u32 enable; /* (u16*) address of task's control register */ + u32 fifo; /* (u32*) address of gen_bd's fifo */ + u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ + u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ + u32 bd_start; /* (struct bcom_bd*) current bd */ + u32 buffer_size; /* size of receive buffer */ +}; + +/* rx task incs that need to be set before enabling the task */ +struct bcom_gen_bd_rx_inc { + u16 pad0; + s16 incr_bytes; + u16 pad1; + s16 incr_dst; +}; + +/* tx task vars that need to be set before enabling the task */ +struct bcom_gen_bd_tx_var { + u32 fifo; /* (u32*) address of gen_bd's fifo */ + u32 enable; /* (u16*) address of task's control register */ + u32 bd_base; /* (struct bcom_bd*) beginning of ring buffer */ + u32 bd_last; /* (struct bcom_bd*) end of ring buffer */ + u32 bd_start; /* (struct bcom_bd*) current bd */ + u32 buffer_size; /* set by uCode for each packet */ +}; + +/* tx task incs that need to be set before enabling the task */ +struct bcom_gen_bd_tx_inc { + u16 pad0; + s16 incr_bytes; + u16 pad1; + s16 incr_src; + u16 pad2; + s16 incr_src_ma; +}; + +/* private structure */ +struct bcom_gen_bd_priv { + phys_addr_t fifo; + int initiator; + int ipr; + int maxbufsize; +}; + + +/* ======================================================================== */ +/* Task support code */ +/* ======================================================================== */ + +struct bcom_task * +bcom_gen_bd_rx_init(int queue_len, phys_addr_t fifo, + int initiator, int ipr, int maxbufsize) +{ + struct bcom_task *tsk; + struct bcom_gen_bd_priv *priv; + + tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), + sizeof(struct bcom_gen_bd_priv)); + if (!tsk) + return NULL; + + tsk->flags = BCOM_FLAGS_NONE; + + priv = tsk->priv; + priv->fifo = fifo; + priv->initiator = initiator; + priv->ipr = ipr; + priv->maxbufsize = maxbufsize; + + if (bcom_gen_bd_rx_reset(tsk)) { + bcom_task_free(tsk); + return NULL; + } + + return tsk; +} +EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_init); + +int +bcom_gen_bd_rx_reset(struct bcom_task *tsk) +{ + struct bcom_gen_bd_priv *priv = tsk->priv; + struct bcom_gen_bd_rx_var *var; + struct bcom_gen_bd_rx_inc *inc; + + /* Shutdown the task */ + bcom_disable_task(tsk->tasknum); + + /* Reset the microcode */ + var = (struct bcom_gen_bd_rx_var *) bcom_task_var(tsk->tasknum); + inc = (struct bcom_gen_bd_rx_inc *) bcom_task_inc(tsk->tasknum); + + if (bcom_load_image(tsk->tasknum, bcom_gen_bd_rx_task)) + return -1; + + var->enable = bcom_eng->regs_base + + offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); + var->fifo = (u32) priv->fifo; + var->bd_base = tsk->bd_pa; + var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); + var->bd_start = tsk->bd_pa; + var->buffer_size = priv->maxbufsize; + + inc->incr_bytes = -(s16)sizeof(u32); + inc->incr_dst = sizeof(u32); + + /* Reset the BDs */ + tsk->index = 0; + tsk->outdex = 0; + + memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); + + /* Configure some stuff */ + bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_RX_BD_PRAGMA); + bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); + + out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); + bcom_set_initiator(tsk->tasknum, priv->initiator); + + out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ + + return 0; +} +EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_reset); + +void +bcom_gen_bd_rx_release(struct bcom_task *tsk) +{ + /* Nothing special for the GenBD tasks */ + bcom_task_free(tsk); +} +EXPORT_SYMBOL_GPL(bcom_gen_bd_rx_release); + + +extern struct bcom_task * +bcom_gen_bd_tx_init(int queue_len, phys_addr_t fifo, + int initiator, int ipr) +{ + struct bcom_task *tsk; + struct bcom_gen_bd_priv *priv; + + tsk = bcom_task_alloc(queue_len, sizeof(struct bcom_gen_bd), + sizeof(struct bcom_gen_bd_priv)); + if (!tsk) + return NULL; + + tsk->flags = BCOM_FLAGS_NONE; + + priv = tsk->priv; + priv->fifo = fifo; + priv->initiator = initiator; + priv->ipr = ipr; + + if (bcom_gen_bd_tx_reset(tsk)) { + bcom_task_free(tsk); + return NULL; + } + + return tsk; +} +EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_init); + +int +bcom_gen_bd_tx_reset(struct bcom_task *tsk) +{ + struct bcom_gen_bd_priv *priv = tsk->priv; + struct bcom_gen_bd_tx_var *var; + struct bcom_gen_bd_tx_inc *inc; + + /* Shutdown the task */ + bcom_disable_task(tsk->tasknum); + + /* Reset the microcode */ + var = (struct bcom_gen_bd_tx_var *) bcom_task_var(tsk->tasknum); + inc = (struct bcom_gen_bd_tx_inc *) bcom_task_inc(tsk->tasknum); + + if (bcom_load_image(tsk->tasknum, bcom_gen_bd_tx_task)) + return -1; + + var->enable = bcom_eng->regs_base + + offsetof(struct mpc52xx_sdma, tcr[tsk->tasknum]); + var->fifo = (u32) priv->fifo; + var->bd_base = tsk->bd_pa; + var->bd_last = tsk->bd_pa + ((tsk->num_bd-1) * tsk->bd_size); + var->bd_start = tsk->bd_pa; + + inc->incr_bytes = -(s16)sizeof(u32); + inc->incr_src = sizeof(u32); + inc->incr_src_ma = sizeof(u8); + + /* Reset the BDs */ + tsk->index = 0; + tsk->outdex = 0; + + memset(tsk->bd, 0x00, tsk->num_bd * tsk->bd_size); + + /* Configure some stuff */ + bcom_set_task_pragma(tsk->tasknum, BCOM_GEN_TX_BD_PRAGMA); + bcom_set_task_auto_start(tsk->tasknum, tsk->tasknum); + + out_8(&bcom_eng->regs->ipr[priv->initiator], priv->ipr); + bcom_set_initiator(tsk->tasknum, priv->initiator); + + out_be32(&bcom_eng->regs->IntPend, 1<<tsk->tasknum); /* Clear ints */ + + return 0; +} +EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_reset); + +void +bcom_gen_bd_tx_release(struct bcom_task *tsk) +{ + /* Nothing special for the GenBD tasks */ + bcom_task_free(tsk); +} +EXPORT_SYMBOL_GPL(bcom_gen_bd_tx_release); + +/* --------------------------------------------------------------------- + * PSC support code + */ + +/** + * bcom_psc_parameters - Bestcomm initialization value table for PSC devices + * + * This structure is only used internally. It is a lookup table for PSC + * specific parameters to bestcomm tasks. + */ +static struct bcom_psc_params { + int rx_initiator; + int rx_ipr; + int tx_initiator; + int tx_ipr; +} bcom_psc_params[] = { + [0] = { + .rx_initiator = BCOM_INITIATOR_PSC1_RX, + .rx_ipr = BCOM_IPR_PSC1_RX, + .tx_initiator = BCOM_INITIATOR_PSC1_TX, + .tx_ipr = BCOM_IPR_PSC1_TX, + }, + [1] = { + .rx_initiator = BCOM_INITIATOR_PSC2_RX, + .rx_ipr = BCOM_IPR_PSC2_RX, + .tx_initiator = BCOM_INITIATOR_PSC2_TX, + .tx_ipr = BCOM_IPR_PSC2_TX, + }, + [2] = { + .rx_initiator = BCOM_INITIATOR_PSC3_RX, + .rx_ipr = BCOM_IPR_PSC3_RX, + .tx_initiator = BCOM_INITIATOR_PSC3_TX, + .tx_ipr = BCOM_IPR_PSC3_TX, + }, + [3] = { + .rx_initiator = BCOM_INITIATOR_PSC4_RX, + .rx_ipr = BCOM_IPR_PSC4_RX, + .tx_initiator = BCOM_INITIATOR_PSC4_TX, + .tx_ipr = BCOM_IPR_PSC4_TX, + }, + [4] = { + .rx_initiator = BCOM_INITIATOR_PSC5_RX, + .rx_ipr = BCOM_IPR_PSC5_RX, + .tx_initiator = BCOM_INITIATOR_PSC5_TX, + .tx_ipr = BCOM_IPR_PSC5_TX, + }, + [5] = { + .rx_initiator = BCOM_INITIATOR_PSC6_RX, + .rx_ipr = BCOM_IPR_PSC6_RX, + .tx_initiator = BCOM_INITIATOR_PSC6_TX, + .tx_ipr = BCOM_IPR_PSC6_TX, + }, +}; + +/** + * bcom_psc_gen_bd_rx_init - Allocate a receive bcom_task for a PSC port + * @psc_num: Number of the PSC to allocate a task for + * @queue_len: number of buffer descriptors to allocate for the task + * @fifo: physical address of FIFO register + * @maxbufsize: Maximum receive data size in bytes. + * + * Allocate a bestcomm task structure for receiving data from a PSC. + */ +struct bcom_task * bcom_psc_gen_bd_rx_init(unsigned psc_num, int queue_len, + phys_addr_t fifo, int maxbufsize) +{ + if (psc_num >= MPC52xx_PSC_MAXNUM) + return NULL; + + return bcom_gen_bd_rx_init(queue_len, fifo, + bcom_psc_params[psc_num].rx_initiator, + bcom_psc_params[psc_num].rx_ipr, + maxbufsize); +} +EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_rx_init); + +/** + * bcom_psc_gen_bd_tx_init - Allocate a transmit bcom_task for a PSC port + * @psc_num: Number of the PSC to allocate a task for + * @queue_len: number of buffer descriptors to allocate for the task + * @fifo: physical address of FIFO register + * + * Allocate a bestcomm task structure for transmitting data to a PSC. + */ +struct bcom_task * +bcom_psc_gen_bd_tx_init(unsigned psc_num, int queue_len, phys_addr_t fifo) +{ + struct psc; + return bcom_gen_bd_tx_init(queue_len, fifo, + bcom_psc_params[psc_num].tx_initiator, + bcom_psc_params[psc_num].tx_ipr); +} +EXPORT_SYMBOL_GPL(bcom_psc_gen_bd_tx_init); + + +MODULE_DESCRIPTION("BestComm General Buffer Descriptor tasks driver"); +MODULE_AUTHOR("Jeff Gibbons <jeff.gibbons@appspec.com>"); +MODULE_LICENSE("GPL v2"); + diff --git a/drivers/dma/bestcomm/sram.c b/drivers/dma/bestcomm/sram.c new file mode 100644 index 000000000..2074e0e3f --- /dev/null +++ b/drivers/dma/bestcomm/sram.c @@ -0,0 +1,179 @@ +/* + * Simple memory allocator for on-board SRAM + * + * + * Maintainer : Sylvain Munaut <tnt@246tNt.com> + * + * Copyright (C) 2005 Sylvain Munaut <tnt@246tNt.com> + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <linux/err.h> +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/of.h> +#include <linux/of_address.h> + +#include <asm/io.h> +#include <asm/mmu.h> + +#include <linux/fsl/bestcomm/sram.h> + + +/* Struct keeping our 'state' */ +struct bcom_sram *bcom_sram = NULL; +EXPORT_SYMBOL_GPL(bcom_sram); /* needed for inline functions */ + + +/* ======================================================================== */ +/* Public API */ +/* ======================================================================== */ +/* DO NOT USE in interrupts, if needed in irq handler, we should use the + _irqsave version of the spin_locks */ + +int bcom_sram_init(struct device_node *sram_node, char *owner) +{ + int rv; + const u32 *regaddr_p; + u64 regaddr64, size64; + unsigned int psize; + + /* Create our state struct */ + if (bcom_sram) { + printk(KERN_ERR "%s: bcom_sram_init: " + "Already initialized !\n", owner); + return -EBUSY; + } + + bcom_sram = kmalloc(sizeof(struct bcom_sram), GFP_KERNEL); + if (!bcom_sram) { + printk(KERN_ERR "%s: bcom_sram_init: " + "Couldn't allocate internal state !\n", owner); + return -ENOMEM; + } + + /* Get address and size of the sram */ + regaddr_p = of_get_address(sram_node, 0, &size64, NULL); + if (!regaddr_p) { + printk(KERN_ERR "%s: bcom_sram_init: " + "Invalid device node !\n", owner); + rv = -EINVAL; + goto error_free; + } + + regaddr64 = of_translate_address(sram_node, regaddr_p); + + bcom_sram->base_phys = (phys_addr_t) regaddr64; + bcom_sram->size = (unsigned int) size64; + + /* Request region */ + if (!request_mem_region(bcom_sram->base_phys, bcom_sram->size, owner)) { + printk(KERN_ERR "%s: bcom_sram_init: " + "Couldn't request region !\n", owner); + rv = -EBUSY; + goto error_free; + } + + /* Map SRAM */ + /* sram is not really __iomem */ + bcom_sram->base_virt = (void*) ioremap(bcom_sram->base_phys, bcom_sram->size); + + if (!bcom_sram->base_virt) { + printk(KERN_ERR "%s: bcom_sram_init: " + "Map error SRAM zone 0x%08lx (0x%0x)!\n", + owner, (long)bcom_sram->base_phys, bcom_sram->size ); + rv = -ENOMEM; + goto error_release; + } + + /* Create an rheap (defaults to 32 bits word alignment) */ + bcom_sram->rh = rh_create(4); + + /* Attach the free zones */ +#if 0 + /* Currently disabled ... for future use only */ + reg_addr_p = of_get_property(sram_node, "available", &psize); +#else + regaddr_p = NULL; + psize = 0; +#endif + + if (!regaddr_p || !psize) { + /* Attach the whole zone */ + rh_attach_region(bcom_sram->rh, 0, bcom_sram->size); + } else { + /* Attach each zone independently */ + while (psize >= 2 * sizeof(u32)) { + phys_addr_t zbase = of_translate_address(sram_node, regaddr_p); + rh_attach_region(bcom_sram->rh, zbase - bcom_sram->base_phys, regaddr_p[1]); + regaddr_p += 2; + psize -= 2 * sizeof(u32); + } + } + + /* Init our spinlock */ + spin_lock_init(&bcom_sram->lock); + + return 0; + +error_release: + release_mem_region(bcom_sram->base_phys, bcom_sram->size); +error_free: + kfree(bcom_sram); + bcom_sram = NULL; + + return rv; +} +EXPORT_SYMBOL_GPL(bcom_sram_init); + +void bcom_sram_cleanup(void) +{ + /* Free resources */ + if (bcom_sram) { + rh_destroy(bcom_sram->rh); + iounmap((void __iomem *)bcom_sram->base_virt); + release_mem_region(bcom_sram->base_phys, bcom_sram->size); + kfree(bcom_sram); + bcom_sram = NULL; + } +} +EXPORT_SYMBOL_GPL(bcom_sram_cleanup); + +void* bcom_sram_alloc(int size, int align, phys_addr_t *phys) +{ + unsigned long offset; + + spin_lock(&bcom_sram->lock); + offset = rh_alloc_align(bcom_sram->rh, size, align, NULL); + spin_unlock(&bcom_sram->lock); + + if (IS_ERR_VALUE(offset)) + return NULL; + + *phys = bcom_sram->base_phys + offset; + return bcom_sram->base_virt + offset; +} +EXPORT_SYMBOL_GPL(bcom_sram_alloc); + +void bcom_sram_free(void *ptr) +{ + unsigned long offset; + + if (!ptr) + return; + + offset = ptr - bcom_sram->base_virt; + + spin_lock(&bcom_sram->lock); + rh_free(bcom_sram->rh, offset); + spin_unlock(&bcom_sram->lock); +} +EXPORT_SYMBOL_GPL(bcom_sram_free); + diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c new file mode 100644 index 000000000..fd22dd369 --- /dev/null +++ b/drivers/dma/coh901318.c @@ -0,0 +1,2796 @@ +/* + * driver/dma/coh901318.c + * + * Copyright (C) 2007-2009 ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + * DMA driver for COH 901 318 + * Author: Per Friden <per.friden@stericsson.com> + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/kernel.h> /* printk() */ +#include <linux/fs.h> /* everything... */ +#include <linux/scatterlist.h> +#include <linux/slab.h> /* kmalloc() */ +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/device.h> +#include <linux/irqreturn.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/uaccess.h> +#include <linux/debugfs.h> +#include <linux/platform_data/dma-coh901318.h> +#include <linux/of_dma.h> + +#include "coh901318.h" +#include "dmaengine.h" + +#define COH901318_MOD32_MASK (0x1F) +#define COH901318_WORD_MASK (0xFFFFFFFF) +/* INT_STATUS - Interrupt Status Registers 32bit (R/-) */ +#define COH901318_INT_STATUS1 (0x0000) +#define COH901318_INT_STATUS2 (0x0004) +/* TC_INT_STATUS - Terminal Count Interrupt Status Registers 32bit (R/-) */ +#define COH901318_TC_INT_STATUS1 (0x0008) +#define COH901318_TC_INT_STATUS2 (0x000C) +/* TC_INT_CLEAR - Terminal Count Interrupt Clear Registers 32bit (-/W) */ +#define COH901318_TC_INT_CLEAR1 (0x0010) +#define COH901318_TC_INT_CLEAR2 (0x0014) +/* RAW_TC_INT_STATUS - Raw Term Count Interrupt Status Registers 32bit (R/-) */ +#define COH901318_RAW_TC_INT_STATUS1 (0x0018) +#define COH901318_RAW_TC_INT_STATUS2 (0x001C) +/* BE_INT_STATUS - Bus Error Interrupt Status Registers 32bit (R/-) */ +#define COH901318_BE_INT_STATUS1 (0x0020) +#define COH901318_BE_INT_STATUS2 (0x0024) +/* BE_INT_CLEAR - Bus Error Interrupt Clear Registers 32bit (-/W) */ +#define COH901318_BE_INT_CLEAR1 (0x0028) +#define COH901318_BE_INT_CLEAR2 (0x002C) +/* RAW_BE_INT_STATUS - Raw Term Count Interrupt Status Registers 32bit (R/-) */ +#define COH901318_RAW_BE_INT_STATUS1 (0x0030) +#define COH901318_RAW_BE_INT_STATUS2 (0x0034) + +/* + * CX_CFG - Channel Configuration Registers 32bit (R/W) + */ +#define COH901318_CX_CFG (0x0100) +#define COH901318_CX_CFG_SPACING (0x04) +/* Channel enable activates tha dma job */ +#define COH901318_CX_CFG_CH_ENABLE (0x00000001) +#define COH901318_CX_CFG_CH_DISABLE (0x00000000) +/* Request Mode */ +#define COH901318_CX_CFG_RM_MASK (0x00000006) +#define COH901318_CX_CFG_RM_MEMORY_TO_MEMORY (0x0 << 1) +#define COH901318_CX_CFG_RM_PRIMARY_TO_MEMORY (0x1 << 1) +#define COH901318_CX_CFG_RM_MEMORY_TO_PRIMARY (0x1 << 1) +#define COH901318_CX_CFG_RM_PRIMARY_TO_SECONDARY (0x3 << 1) +#define COH901318_CX_CFG_RM_SECONDARY_TO_PRIMARY (0x3 << 1) +/* Linked channel request field. RM must == 11 */ +#define COH901318_CX_CFG_LCRF_SHIFT 3 +#define COH901318_CX_CFG_LCRF_MASK (0x000001F8) +#define COH901318_CX_CFG_LCR_DISABLE (0x00000000) +/* Terminal Counter Interrupt Request Mask */ +#define COH901318_CX_CFG_TC_IRQ_ENABLE (0x00000200) +#define COH901318_CX_CFG_TC_IRQ_DISABLE (0x00000000) +/* Bus Error interrupt Mask */ +#define COH901318_CX_CFG_BE_IRQ_ENABLE (0x00000400) +#define COH901318_CX_CFG_BE_IRQ_DISABLE (0x00000000) + +/* + * CX_STAT - Channel Status Registers 32bit (R/-) + */ +#define COH901318_CX_STAT (0x0200) +#define COH901318_CX_STAT_SPACING (0x04) +#define COH901318_CX_STAT_RBE_IRQ_IND (0x00000008) +#define COH901318_CX_STAT_RTC_IRQ_IND (0x00000004) +#define COH901318_CX_STAT_ACTIVE (0x00000002) +#define COH901318_CX_STAT_ENABLED (0x00000001) + +/* + * CX_CTRL - Channel Control Registers 32bit (R/W) + */ +#define COH901318_CX_CTRL (0x0400) +#define COH901318_CX_CTRL_SPACING (0x10) +/* Transfer Count Enable */ +#define COH901318_CX_CTRL_TC_ENABLE (0x00001000) +#define COH901318_CX_CTRL_TC_DISABLE (0x00000000) +/* Transfer Count Value 0 - 4095 */ +#define COH901318_CX_CTRL_TC_VALUE_MASK (0x00000FFF) +/* Burst count */ +#define COH901318_CX_CTRL_BURST_COUNT_MASK (0x0000E000) +#define COH901318_CX_CTRL_BURST_COUNT_64_BYTES (0x7 << 13) +#define COH901318_CX_CTRL_BURST_COUNT_48_BYTES (0x6 << 13) +#define COH901318_CX_CTRL_BURST_COUNT_32_BYTES (0x5 << 13) +#define COH901318_CX_CTRL_BURST_COUNT_16_BYTES (0x4 << 13) +#define COH901318_CX_CTRL_BURST_COUNT_8_BYTES (0x3 << 13) +#define COH901318_CX_CTRL_BURST_COUNT_4_BYTES (0x2 << 13) +#define COH901318_CX_CTRL_BURST_COUNT_2_BYTES (0x1 << 13) +#define COH901318_CX_CTRL_BURST_COUNT_1_BYTE (0x0 << 13) +/* Source bus size */ +#define COH901318_CX_CTRL_SRC_BUS_SIZE_MASK (0x00030000) +#define COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS (0x2 << 16) +#define COH901318_CX_CTRL_SRC_BUS_SIZE_16_BITS (0x1 << 16) +#define COH901318_CX_CTRL_SRC_BUS_SIZE_8_BITS (0x0 << 16) +/* Source address increment */ +#define COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE (0x00040000) +#define COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE (0x00000000) +/* Destination Bus Size */ +#define COH901318_CX_CTRL_DST_BUS_SIZE_MASK (0x00180000) +#define COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS (0x2 << 19) +#define COH901318_CX_CTRL_DST_BUS_SIZE_16_BITS (0x1 << 19) +#define COH901318_CX_CTRL_DST_BUS_SIZE_8_BITS (0x0 << 19) +/* Destination address increment */ +#define COH901318_CX_CTRL_DST_ADDR_INC_ENABLE (0x00200000) +#define COH901318_CX_CTRL_DST_ADDR_INC_DISABLE (0x00000000) +/* Master Mode (Master2 is only connected to MSL) */ +#define COH901318_CX_CTRL_MASTER_MODE_MASK (0x00C00000) +#define COH901318_CX_CTRL_MASTER_MODE_M2R_M1W (0x3 << 22) +#define COH901318_CX_CTRL_MASTER_MODE_M1R_M2W (0x2 << 22) +#define COH901318_CX_CTRL_MASTER_MODE_M2RW (0x1 << 22) +#define COH901318_CX_CTRL_MASTER_MODE_M1RW (0x0 << 22) +/* Terminal Count flag to PER enable */ +#define COH901318_CX_CTRL_TCP_ENABLE (0x01000000) +#define COH901318_CX_CTRL_TCP_DISABLE (0x00000000) +/* Terminal Count flags to CPU enable */ +#define COH901318_CX_CTRL_TC_IRQ_ENABLE (0x02000000) +#define COH901318_CX_CTRL_TC_IRQ_DISABLE (0x00000000) +/* Hand shake to peripheral */ +#define COH901318_CX_CTRL_HSP_ENABLE (0x04000000) +#define COH901318_CX_CTRL_HSP_DISABLE (0x00000000) +#define COH901318_CX_CTRL_HSS_ENABLE (0x08000000) +#define COH901318_CX_CTRL_HSS_DISABLE (0x00000000) +/* DMA mode */ +#define COH901318_CX_CTRL_DDMA_MASK (0x30000000) +#define COH901318_CX_CTRL_DDMA_LEGACY (0x0 << 28) +#define COH901318_CX_CTRL_DDMA_DEMAND_DMA1 (0x1 << 28) +#define COH901318_CX_CTRL_DDMA_DEMAND_DMA2 (0x2 << 28) +/* Primary Request Data Destination */ +#define COH901318_CX_CTRL_PRDD_MASK (0x40000000) +#define COH901318_CX_CTRL_PRDD_DEST (0x1 << 30) +#define COH901318_CX_CTRL_PRDD_SOURCE (0x0 << 30) + +/* + * CX_SRC_ADDR - Channel Source Address Registers 32bit (R/W) + */ +#define COH901318_CX_SRC_ADDR (0x0404) +#define COH901318_CX_SRC_ADDR_SPACING (0x10) + +/* + * CX_DST_ADDR - Channel Destination Address Registers 32bit R/W + */ +#define COH901318_CX_DST_ADDR (0x0408) +#define COH901318_CX_DST_ADDR_SPACING (0x10) + +/* + * CX_LNK_ADDR - Channel Link Address Registers 32bit (R/W) + */ +#define COH901318_CX_LNK_ADDR (0x040C) +#define COH901318_CX_LNK_ADDR_SPACING (0x10) +#define COH901318_CX_LNK_LINK_IMMEDIATE (0x00000001) + +/** + * struct coh901318_params - parameters for DMAC configuration + * @config: DMA config register + * @ctrl_lli_last: DMA control register for the last lli in the list + * @ctrl_lli: DMA control register for an lli + * @ctrl_lli_chained: DMA control register for a chained lli + */ +struct coh901318_params { + u32 config; + u32 ctrl_lli_last; + u32 ctrl_lli; + u32 ctrl_lli_chained; +}; + +/** + * struct coh_dma_channel - dma channel base + * @name: ascii name of dma channel + * @number: channel id number + * @desc_nbr_max: number of preallocated descriptors + * @priority_high: prio of channel, 0 low otherwise high. + * @param: configuration parameters + */ +struct coh_dma_channel { + const char name[32]; + const int number; + const int desc_nbr_max; + const int priority_high; + const struct coh901318_params param; +}; + +/** + * struct powersave - DMA power save structure + * @lock: lock protecting data in this struct + * @started_channels: bit mask indicating active dma channels + */ +struct powersave { + spinlock_t lock; + u64 started_channels; +}; + +/* points out all dma slave channels. + * Syntax is [A1, B1, A2, B2, .... ,-1,-1] + * Select all channels from A to B, end of list is marked with -1,-1 + */ +static int dma_slave_channels[] = { + U300_DMA_MSL_TX_0, U300_DMA_SPI_RX, + U300_DMA_UART1_TX, U300_DMA_UART1_RX, -1, -1}; + +/* points out all dma memcpy channels. */ +static int dma_memcpy_channels[] = { + U300_DMA_GENERAL_PURPOSE_0, U300_DMA_GENERAL_PURPOSE_8, -1, -1}; + +#define flags_memcpy_config (COH901318_CX_CFG_CH_DISABLE | \ + COH901318_CX_CFG_RM_MEMORY_TO_MEMORY | \ + COH901318_CX_CFG_LCR_DISABLE | \ + COH901318_CX_CFG_TC_IRQ_ENABLE | \ + COH901318_CX_CFG_BE_IRQ_ENABLE) +#define flags_memcpy_lli_chained (COH901318_CX_CTRL_TC_ENABLE | \ + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | \ + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | \ + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | \ + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | \ + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | \ + COH901318_CX_CTRL_MASTER_MODE_M1RW | \ + COH901318_CX_CTRL_TCP_DISABLE | \ + COH901318_CX_CTRL_TC_IRQ_DISABLE | \ + COH901318_CX_CTRL_HSP_DISABLE | \ + COH901318_CX_CTRL_HSS_DISABLE | \ + COH901318_CX_CTRL_DDMA_LEGACY | \ + COH901318_CX_CTRL_PRDD_SOURCE) +#define flags_memcpy_lli (COH901318_CX_CTRL_TC_ENABLE | \ + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | \ + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | \ + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | \ + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | \ + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | \ + COH901318_CX_CTRL_MASTER_MODE_M1RW | \ + COH901318_CX_CTRL_TCP_DISABLE | \ + COH901318_CX_CTRL_TC_IRQ_DISABLE | \ + COH901318_CX_CTRL_HSP_DISABLE | \ + COH901318_CX_CTRL_HSS_DISABLE | \ + COH901318_CX_CTRL_DDMA_LEGACY | \ + COH901318_CX_CTRL_PRDD_SOURCE) +#define flags_memcpy_lli_last (COH901318_CX_CTRL_TC_ENABLE | \ + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | \ + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | \ + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | \ + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | \ + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | \ + COH901318_CX_CTRL_MASTER_MODE_M1RW | \ + COH901318_CX_CTRL_TCP_DISABLE | \ + COH901318_CX_CTRL_TC_IRQ_ENABLE | \ + COH901318_CX_CTRL_HSP_DISABLE | \ + COH901318_CX_CTRL_HSS_DISABLE | \ + COH901318_CX_CTRL_DDMA_LEGACY | \ + COH901318_CX_CTRL_PRDD_SOURCE) + +const struct coh_dma_channel chan_config[U300_DMA_CHANNELS] = { + { + .number = U300_DMA_MSL_TX_0, + .name = "MSL TX 0", + .priority_high = 0, + }, + { + .number = U300_DMA_MSL_TX_1, + .name = "MSL TX 1", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + }, + { + .number = U300_DMA_MSL_TX_2, + .name = "MSL TX 2", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .desc_nbr_max = 10, + }, + { + .number = U300_DMA_MSL_TX_3, + .name = "MSL TX 3", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + }, + { + .number = U300_DMA_MSL_TX_4, + .name = "MSL TX 4", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1R_M2W | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + }, + { + .number = U300_DMA_MSL_TX_5, + .name = "MSL TX 5", + .priority_high = 0, + }, + { + .number = U300_DMA_MSL_TX_6, + .name = "MSL TX 6", + .priority_high = 0, + }, + { + .number = U300_DMA_MSL_RX_0, + .name = "MSL RX 0", + .priority_high = 0, + }, + { + .number = U300_DMA_MSL_RX_1, + .name = "MSL RX 1", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli = 0, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + }, + { + .number = U300_DMA_MSL_RX_2, + .name = "MSL RX 2", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + }, + { + .number = U300_DMA_MSL_RX_3, + .name = "MSL RX 3", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + }, + { + .number = U300_DMA_MSL_RX_4, + .name = "MSL RX 4", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + }, + { + .number = U300_DMA_MSL_RX_5, + .name = "MSL RX 5", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_32_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M2R_M1W | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_DEMAND_DMA1 | + COH901318_CX_CTRL_PRDD_DEST, + }, + { + .number = U300_DMA_MSL_RX_6, + .name = "MSL RX 6", + .priority_high = 0, + }, + /* + * Don't set up device address, burst count or size of src + * or dst bus for this peripheral - handled by PrimeCell + * DMA extension. + */ + { + .number = U300_DMA_MMCSD_RX_TX, + .name = "MMCSD RX TX", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + + }, + { + .number = U300_DMA_MSPRO_TX, + .name = "MSPRO TX", + .priority_high = 0, + }, + { + .number = U300_DMA_MSPRO_RX, + .name = "MSPRO RX", + .priority_high = 0, + }, + /* + * Don't set up device address, burst count or size of src + * or dst bus for this peripheral - handled by PrimeCell + * DMA extension. + */ + { + .number = U300_DMA_UART0_TX, + .name = "UART0 TX", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + }, + { + .number = U300_DMA_UART0_RX, + .name = "UART0 RX", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + }, + { + .number = U300_DMA_APEX_TX, + .name = "APEX TX", + .priority_high = 0, + }, + { + .number = U300_DMA_APEX_RX, + .name = "APEX RX", + .priority_high = 0, + }, + { + .number = U300_DMA_PCM_I2S0_TX, + .name = "PCM I2S0 TX", + .priority_high = 1, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + }, + { + .number = U300_DMA_PCM_I2S0_RX, + .name = "PCM I2S0 RX", + .priority_high = 1, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_DEST, + }, + { + .number = U300_DMA_PCM_I2S1_TX, + .name = "PCM I2S1 TX", + .priority_high = 1, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_DISABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_SOURCE, + }, + { + .number = U300_DMA_PCM_I2S1_RX, + .name = "PCM I2S1 RX", + .priority_high = 1, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_DEST, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_BURST_COUNT_16_BYTES | + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_SRC_ADDR_INC_DISABLE | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_ENABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY | + COH901318_CX_CTRL_PRDD_DEST, + }, + { + .number = U300_DMA_XGAM_CDI, + .name = "XGAM CDI", + .priority_high = 0, + }, + { + .number = U300_DMA_XGAM_PDI, + .name = "XGAM PDI", + .priority_high = 0, + }, + /* + * Don't set up device address, burst count or size of src + * or dst bus for this peripheral - handled by PrimeCell + * DMA extension. + */ + { + .number = U300_DMA_SPI_TX, + .name = "SPI TX", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + }, + { + .number = U300_DMA_SPI_RX, + .name = "SPI RX", + .priority_high = 0, + .param.config = COH901318_CX_CFG_CH_DISABLE | + COH901318_CX_CFG_LCR_DISABLE | + COH901318_CX_CFG_TC_IRQ_ENABLE | + COH901318_CX_CFG_BE_IRQ_ENABLE, + .param.ctrl_lli_chained = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_DISABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + .param.ctrl_lli_last = 0 | + COH901318_CX_CTRL_TC_ENABLE | + COH901318_CX_CTRL_MASTER_MODE_M1RW | + COH901318_CX_CTRL_TCP_DISABLE | + COH901318_CX_CTRL_TC_IRQ_ENABLE | + COH901318_CX_CTRL_HSP_ENABLE | + COH901318_CX_CTRL_HSS_DISABLE | + COH901318_CX_CTRL_DDMA_LEGACY, + + }, + { + .number = U300_DMA_GENERAL_PURPOSE_0, + .name = "GENERAL 00", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_1, + .name = "GENERAL 01", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_2, + .name = "GENERAL 02", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_3, + .name = "GENERAL 03", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_4, + .name = "GENERAL 04", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_5, + .name = "GENERAL 05", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_6, + .name = "GENERAL 06", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_7, + .name = "GENERAL 07", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_GENERAL_PURPOSE_8, + .name = "GENERAL 08", + .priority_high = 0, + + .param.config = flags_memcpy_config, + .param.ctrl_lli_chained = flags_memcpy_lli_chained, + .param.ctrl_lli = flags_memcpy_lli, + .param.ctrl_lli_last = flags_memcpy_lli_last, + }, + { + .number = U300_DMA_UART1_TX, + .name = "UART1 TX", + .priority_high = 0, + }, + { + .number = U300_DMA_UART1_RX, + .name = "UART1 RX", + .priority_high = 0, + } +}; + +#define COHC_2_DEV(cohc) (&cohc->chan.dev->device) + +#ifdef VERBOSE_DEBUG +#define COH_DBG(x) ({ if (1) x; 0; }) +#else +#define COH_DBG(x) ({ if (0) x; 0; }) +#endif + +struct coh901318_desc { + struct dma_async_tx_descriptor desc; + struct list_head node; + struct scatterlist *sg; + unsigned int sg_len; + struct coh901318_lli *lli; + enum dma_transfer_direction dir; + unsigned long flags; + u32 head_config; + u32 head_ctrl; +}; + +struct coh901318_base { + struct device *dev; + void __iomem *virtbase; + struct coh901318_pool pool; + struct powersave pm; + struct dma_device dma_slave; + struct dma_device dma_memcpy; + struct coh901318_chan *chans; +}; + +struct coh901318_chan { + spinlock_t lock; + int allocated; + int id; + int stopped; + + struct work_struct free_work; + struct dma_chan chan; + + struct tasklet_struct tasklet; + + struct list_head active; + struct list_head queue; + struct list_head free; + + unsigned long nbr_active_done; + unsigned long busy; + + u32 addr; + u32 ctrl; + + struct coh901318_base *base; +}; + +static void coh901318_list_print(struct coh901318_chan *cohc, + struct coh901318_lli *lli) +{ + struct coh901318_lli *l = lli; + int i = 0; + + while (l) { + dev_vdbg(COHC_2_DEV(cohc), "i %d, lli %p, ctrl 0x%x, src 0x%x" + ", dst 0x%x, link 0x%x virt_link_addr 0x%p\n", + i, l, l->control, l->src_addr, l->dst_addr, + l->link_addr, l->virt_link_addr); + i++; + l = l->virt_link_addr; + } +} + +#ifdef CONFIG_DEBUG_FS + +#define COH901318_DEBUGFS_ASSIGN(x, y) (x = y) + +static struct coh901318_base *debugfs_dma_base; +static struct dentry *dma_dentry; + +static int coh901318_debugfs_read(struct file *file, char __user *buf, + size_t count, loff_t *f_pos) +{ + u64 started_channels = debugfs_dma_base->pm.started_channels; + int pool_count = debugfs_dma_base->pool.debugfs_pool_counter; + char *dev_buf; + char *tmp; + int ret; + int i; + + dev_buf = kmalloc(4*1024, GFP_KERNEL); + if (dev_buf == NULL) + return -ENOMEM; + tmp = dev_buf; + + tmp += sprintf(tmp, "DMA -- enabled dma channels\n"); + + for (i = 0; i < U300_DMA_CHANNELS; i++) + if (started_channels & (1 << i)) + tmp += sprintf(tmp, "channel %d\n", i); + + tmp += sprintf(tmp, "Pool alloc nbr %d\n", pool_count); + + ret = simple_read_from_buffer(buf, count, f_pos, dev_buf, + tmp - dev_buf); + kfree(dev_buf); + return ret; +} + +static const struct file_operations coh901318_debugfs_status_operations = { + .owner = THIS_MODULE, + .open = simple_open, + .read = coh901318_debugfs_read, + .llseek = default_llseek, +}; + + +static int __init init_coh901318_debugfs(void) +{ + + dma_dentry = debugfs_create_dir("dma", NULL); + + (void) debugfs_create_file("status", + S_IFREG | S_IRUGO, + dma_dentry, NULL, + &coh901318_debugfs_status_operations); + return 0; +} + +static void __exit exit_coh901318_debugfs(void) +{ + debugfs_remove_recursive(dma_dentry); +} + +module_init(init_coh901318_debugfs); +module_exit(exit_coh901318_debugfs); +#else + +#define COH901318_DEBUGFS_ASSIGN(x, y) + +#endif /* CONFIG_DEBUG_FS */ + +static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan) +{ + return container_of(chan, struct coh901318_chan, chan); +} + +static inline const struct coh901318_params * +cohc_chan_param(struct coh901318_chan *cohc) +{ + return &chan_config[cohc->id].param; +} + +static inline const struct coh_dma_channel * +cohc_chan_conf(struct coh901318_chan *cohc) +{ + return &chan_config[cohc->id]; +} + +static void enable_powersave(struct coh901318_chan *cohc) +{ + unsigned long flags; + struct powersave *pm = &cohc->base->pm; + + spin_lock_irqsave(&pm->lock, flags); + + pm->started_channels &= ~(1ULL << cohc->id); + + spin_unlock_irqrestore(&pm->lock, flags); +} +static void disable_powersave(struct coh901318_chan *cohc) +{ + unsigned long flags; + struct powersave *pm = &cohc->base->pm; + + spin_lock_irqsave(&pm->lock, flags); + + pm->started_channels |= (1ULL << cohc->id); + + spin_unlock_irqrestore(&pm->lock, flags); +} + +static inline int coh901318_set_ctrl(struct coh901318_chan *cohc, u32 control) +{ + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + writel(control, + virtbase + COH901318_CX_CTRL + + COH901318_CX_CTRL_SPACING * channel); + return 0; +} + +static inline int coh901318_set_conf(struct coh901318_chan *cohc, u32 conf) +{ + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + writel(conf, + virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING*channel); + return 0; +} + + +static int coh901318_start(struct coh901318_chan *cohc) +{ + u32 val; + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + disable_powersave(cohc); + + val = readl(virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + /* Enable channel */ + val |= COH901318_CX_CFG_CH_ENABLE; + writel(val, virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + return 0; +} + +static int coh901318_prep_linked_list(struct coh901318_chan *cohc, + struct coh901318_lli *lli) +{ + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + BUG_ON(readl(virtbase + COH901318_CX_STAT + + COH901318_CX_STAT_SPACING*channel) & + COH901318_CX_STAT_ACTIVE); + + writel(lli->src_addr, + virtbase + COH901318_CX_SRC_ADDR + + COH901318_CX_SRC_ADDR_SPACING * channel); + + writel(lli->dst_addr, virtbase + + COH901318_CX_DST_ADDR + + COH901318_CX_DST_ADDR_SPACING * channel); + + writel(lli->link_addr, virtbase + COH901318_CX_LNK_ADDR + + COH901318_CX_LNK_ADDR_SPACING * channel); + + writel(lli->control, virtbase + COH901318_CX_CTRL + + COH901318_CX_CTRL_SPACING * channel); + + return 0; +} + +static struct coh901318_desc * +coh901318_desc_get(struct coh901318_chan *cohc) +{ + struct coh901318_desc *desc; + + if (list_empty(&cohc->free)) { + /* alloc new desc because we're out of used ones + * TODO: alloc a pile of descs instead of just one, + * avoid many small allocations. + */ + desc = kzalloc(sizeof(struct coh901318_desc), GFP_NOWAIT); + if (desc == NULL) + goto out; + INIT_LIST_HEAD(&desc->node); + dma_async_tx_descriptor_init(&desc->desc, &cohc->chan); + } else { + /* Reuse an old desc. */ + desc = list_first_entry(&cohc->free, + struct coh901318_desc, + node); + list_del(&desc->node); + /* Initialize it a bit so it's not insane */ + desc->sg = NULL; + desc->sg_len = 0; + desc->desc.callback = NULL; + desc->desc.callback_param = NULL; + } + + out: + return desc; +} + +static void +coh901318_desc_free(struct coh901318_chan *cohc, struct coh901318_desc *cohd) +{ + list_add_tail(&cohd->node, &cohc->free); +} + +/* call with irq lock held */ +static void +coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc) +{ + list_add_tail(&desc->node, &cohc->active); +} + +static struct coh901318_desc * +coh901318_first_active_get(struct coh901318_chan *cohc) +{ + struct coh901318_desc *d; + + if (list_empty(&cohc->active)) + return NULL; + + d = list_first_entry(&cohc->active, + struct coh901318_desc, + node); + return d; +} + +static void +coh901318_desc_remove(struct coh901318_desc *cohd) +{ + list_del(&cohd->node); +} + +static void +coh901318_desc_queue(struct coh901318_chan *cohc, struct coh901318_desc *desc) +{ + list_add_tail(&desc->node, &cohc->queue); +} + +static struct coh901318_desc * +coh901318_first_queued(struct coh901318_chan *cohc) +{ + struct coh901318_desc *d; + + if (list_empty(&cohc->queue)) + return NULL; + + d = list_first_entry(&cohc->queue, + struct coh901318_desc, + node); + return d; +} + +static inline u32 coh901318_get_bytes_in_lli(struct coh901318_lli *in_lli) +{ + struct coh901318_lli *lli = in_lli; + u32 bytes = 0; + + while (lli) { + bytes += lli->control & COH901318_CX_CTRL_TC_VALUE_MASK; + lli = lli->virt_link_addr; + } + return bytes; +} + +/* + * Get the number of bytes left to transfer on this channel, + * it is unwise to call this before stopping the channel for + * absolute measures, but for a rough guess you can still call + * it. + */ +static u32 coh901318_get_bytes_left(struct dma_chan *chan) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + struct coh901318_desc *cohd; + struct list_head *pos; + unsigned long flags; + u32 left = 0; + int i = 0; + + spin_lock_irqsave(&cohc->lock, flags); + + /* + * If there are many queued jobs, we iterate and add the + * size of them all. We take a special look on the first + * job though, since it is probably active. + */ + list_for_each(pos, &cohc->active) { + /* + * The first job in the list will be working on the + * hardware. The job can be stopped but still active, + * so that the transfer counter is somewhere inside + * the buffer. + */ + cohd = list_entry(pos, struct coh901318_desc, node); + + if (i == 0) { + struct coh901318_lli *lli; + dma_addr_t ladd; + + /* Read current transfer count value */ + left = readl(cohc->base->virtbase + + COH901318_CX_CTRL + + COH901318_CX_CTRL_SPACING * cohc->id) & + COH901318_CX_CTRL_TC_VALUE_MASK; + + /* See if the transfer is linked... */ + ladd = readl(cohc->base->virtbase + + COH901318_CX_LNK_ADDR + + COH901318_CX_LNK_ADDR_SPACING * + cohc->id) & + ~COH901318_CX_LNK_LINK_IMMEDIATE; + /* Single transaction */ + if (!ladd) + continue; + + /* + * Linked transaction, follow the lli, find the + * currently processing lli, and proceed to the next + */ + lli = cohd->lli; + while (lli && lli->link_addr != ladd) + lli = lli->virt_link_addr; + + if (lli) + lli = lli->virt_link_addr; + + /* + * Follow remaining lli links around to count the total + * number of bytes left + */ + left += coh901318_get_bytes_in_lli(lli); + } else { + left += coh901318_get_bytes_in_lli(cohd->lli); + } + i++; + } + + /* Also count bytes in the queued jobs */ + list_for_each(pos, &cohc->queue) { + cohd = list_entry(pos, struct coh901318_desc, node); + left += coh901318_get_bytes_in_lli(cohd->lli); + } + + spin_unlock_irqrestore(&cohc->lock, flags); + + return left; +} + +/* + * Pauses a transfer without losing data. Enables power save. + * Use this function in conjunction with coh901318_resume. + */ +static int coh901318_pause(struct dma_chan *chan) +{ + u32 val; + unsigned long flags; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + spin_lock_irqsave(&cohc->lock, flags); + + /* Disable channel in HW */ + val = readl(virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + /* Stopping infinite transfer */ + if ((val & COH901318_CX_CTRL_TC_ENABLE) == 0 && + (val & COH901318_CX_CFG_CH_ENABLE)) + cohc->stopped = 1; + + + val &= ~COH901318_CX_CFG_CH_ENABLE; + /* Enable twice, HW bug work around */ + writel(val, virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + writel(val, virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + /* Spin-wait for it to actually go inactive */ + while (readl(virtbase + COH901318_CX_STAT+COH901318_CX_STAT_SPACING * + channel) & COH901318_CX_STAT_ACTIVE) + cpu_relax(); + + /* Check if we stopped an active job */ + if ((readl(virtbase + COH901318_CX_CTRL+COH901318_CX_CTRL_SPACING * + channel) & COH901318_CX_CTRL_TC_VALUE_MASK) > 0) + cohc->stopped = 1; + + enable_powersave(cohc); + + spin_unlock_irqrestore(&cohc->lock, flags); + return 0; +} + +/* Resumes a transfer that has been stopped via 300_dma_stop(..). + Power save is handled. +*/ +static int coh901318_resume(struct dma_chan *chan) +{ + u32 val; + unsigned long flags; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int channel = cohc->id; + + spin_lock_irqsave(&cohc->lock, flags); + + disable_powersave(cohc); + + if (cohc->stopped) { + /* Enable channel in HW */ + val = readl(cohc->base->virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING * channel); + + val |= COH901318_CX_CFG_CH_ENABLE; + + writel(val, cohc->base->virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING*channel); + + cohc->stopped = 0; + } + + spin_unlock_irqrestore(&cohc->lock, flags); + return 0; +} + +bool coh901318_filter_id(struct dma_chan *chan, void *chan_id) +{ + unsigned int ch_nr = (unsigned int) chan_id; + + if (ch_nr == to_coh901318_chan(chan)->id) + return true; + + return false; +} +EXPORT_SYMBOL(coh901318_filter_id); + +struct coh901318_filter_args { + struct coh901318_base *base; + unsigned int ch_nr; +}; + +static bool coh901318_filter_base_and_id(struct dma_chan *chan, void *data) +{ + struct coh901318_filter_args *args = data; + + if (&args->base->dma_slave == chan->device && + args->ch_nr == to_coh901318_chan(chan)->id) + return true; + + return false; +} + +static struct dma_chan *coh901318_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct coh901318_filter_args args = { + .base = ofdma->of_dma_data, + .ch_nr = dma_spec->args[0], + }; + dma_cap_mask_t cap; + dma_cap_zero(cap); + dma_cap_set(DMA_SLAVE, cap); + + return dma_request_channel(cap, coh901318_filter_base_and_id, &args); +} +/* + * DMA channel allocation + */ +static int coh901318_config(struct coh901318_chan *cohc, + struct coh901318_params *param) +{ + unsigned long flags; + const struct coh901318_params *p; + int channel = cohc->id; + void __iomem *virtbase = cohc->base->virtbase; + + spin_lock_irqsave(&cohc->lock, flags); + + if (param) + p = param; + else + p = cohc_chan_param(cohc); + + /* Clear any pending BE or TC interrupt */ + if (channel < 32) { + writel(1 << channel, virtbase + COH901318_BE_INT_CLEAR1); + writel(1 << channel, virtbase + COH901318_TC_INT_CLEAR1); + } else { + writel(1 << (channel - 32), virtbase + + COH901318_BE_INT_CLEAR2); + writel(1 << (channel - 32), virtbase + + COH901318_TC_INT_CLEAR2); + } + + coh901318_set_conf(cohc, p->config); + coh901318_set_ctrl(cohc, p->ctrl_lli_last); + + spin_unlock_irqrestore(&cohc->lock, flags); + + return 0; +} + +/* must lock when calling this function + * start queued jobs, if any + * TODO: start all queued jobs in one go + * + * Returns descriptor if queued job is started otherwise NULL. + * If the queue is empty NULL is returned. + */ +static struct coh901318_desc *coh901318_queue_start(struct coh901318_chan *cohc) +{ + struct coh901318_desc *cohd; + + /* + * start queued jobs, if any + * TODO: transmit all queued jobs in one go + */ + cohd = coh901318_first_queued(cohc); + + if (cohd != NULL) { + /* Remove from queue */ + coh901318_desc_remove(cohd); + /* initiate DMA job */ + cohc->busy = 1; + + coh901318_desc_submit(cohc, cohd); + + /* Program the transaction head */ + coh901318_set_conf(cohc, cohd->head_config); + coh901318_set_ctrl(cohc, cohd->head_ctrl); + coh901318_prep_linked_list(cohc, cohd->lli); + + /* start dma job on this channel */ + coh901318_start(cohc); + + } + + return cohd; +} + +/* + * This tasklet is called from the interrupt handler to + * handle each descriptor (DMA job) that is sent to a channel. + */ +static void dma_tasklet(unsigned long data) +{ + struct coh901318_chan *cohc = (struct coh901318_chan *) data; + struct coh901318_desc *cohd_fin; + unsigned long flags; + dma_async_tx_callback callback; + void *callback_param; + + dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d" + " nbr_active_done %ld\n", __func__, + cohc->id, cohc->nbr_active_done); + + spin_lock_irqsave(&cohc->lock, flags); + + /* get first active descriptor entry from list */ + cohd_fin = coh901318_first_active_get(cohc); + + if (cohd_fin == NULL) + goto err; + + /* locate callback to client */ + callback = cohd_fin->desc.callback; + callback_param = cohd_fin->desc.callback_param; + + /* sign this job as completed on the channel */ + dma_cookie_complete(&cohd_fin->desc); + + /* release the lli allocation and remove the descriptor */ + coh901318_lli_free(&cohc->base->pool, &cohd_fin->lli); + + /* return desc to free-list */ + coh901318_desc_remove(cohd_fin); + coh901318_desc_free(cohc, cohd_fin); + + spin_unlock_irqrestore(&cohc->lock, flags); + + /* Call the callback when we're done */ + if (callback) + callback(callback_param); + + spin_lock_irqsave(&cohc->lock, flags); + + /* + * If another interrupt fired while the tasklet was scheduling, + * we don't get called twice, so we have this number of active + * counter that keep track of the number of IRQs expected to + * be handled for this channel. If there happen to be more than + * one IRQ to be ack:ed, we simply schedule this tasklet again. + */ + cohc->nbr_active_done--; + if (cohc->nbr_active_done) { + dev_dbg(COHC_2_DEV(cohc), "scheduling tasklet again, new IRQs " + "came in while we were scheduling this tasklet\n"); + if (cohc_chan_conf(cohc)->priority_high) + tasklet_hi_schedule(&cohc->tasklet); + else + tasklet_schedule(&cohc->tasklet); + } + + spin_unlock_irqrestore(&cohc->lock, flags); + + return; + + err: + spin_unlock_irqrestore(&cohc->lock, flags); + dev_err(COHC_2_DEV(cohc), "[%s] No active dma desc\n", __func__); +} + + +/* called from interrupt context */ +static void dma_tc_handle(struct coh901318_chan *cohc) +{ + /* + * If the channel is not allocated, then we shouldn't have + * any TC interrupts on it. + */ + if (!cohc->allocated) { + dev_err(COHC_2_DEV(cohc), "spurious interrupt from " + "unallocated channel\n"); + return; + } + + spin_lock(&cohc->lock); + + /* + * When we reach this point, at least one queue item + * should have been moved over from cohc->queue to + * cohc->active and run to completion, that is why we're + * getting a terminal count interrupt is it not? + * If you get this BUG() the most probable cause is that + * the individual nodes in the lli chain have IRQ enabled, + * so check your platform config for lli chain ctrl. + */ + BUG_ON(list_empty(&cohc->active)); + + cohc->nbr_active_done++; + + /* + * This attempt to take a job from cohc->queue, put it + * into cohc->active and start it. + */ + if (coh901318_queue_start(cohc) == NULL) + cohc->busy = 0; + + spin_unlock(&cohc->lock); + + /* + * This tasklet will remove items from cohc->active + * and thus terminates them. + */ + if (cohc_chan_conf(cohc)->priority_high) + tasklet_hi_schedule(&cohc->tasklet); + else + tasklet_schedule(&cohc->tasklet); +} + + +static irqreturn_t dma_irq_handler(int irq, void *dev_id) +{ + u32 status1; + u32 status2; + int i; + int ch; + struct coh901318_base *base = dev_id; + struct coh901318_chan *cohc; + void __iomem *virtbase = base->virtbase; + + status1 = readl(virtbase + COH901318_INT_STATUS1); + status2 = readl(virtbase + COH901318_INT_STATUS2); + + if (unlikely(status1 == 0 && status2 == 0)) { + dev_warn(base->dev, "spurious DMA IRQ from no channel!\n"); + return IRQ_HANDLED; + } + + /* TODO: consider handle IRQ in tasklet here to + * minimize interrupt latency */ + + /* Check the first 32 DMA channels for IRQ */ + while (status1) { + /* Find first bit set, return as a number. */ + i = ffs(status1) - 1; + ch = i; + + cohc = &base->chans[ch]; + spin_lock(&cohc->lock); + + /* Mask off this bit */ + status1 &= ~(1 << i); + /* Check the individual channel bits */ + if (test_bit(i, virtbase + COH901318_BE_INT_STATUS1)) { + dev_crit(COHC_2_DEV(cohc), + "DMA bus error on channel %d!\n", ch); + BUG_ON(1); + /* Clear BE interrupt */ + __set_bit(i, virtbase + COH901318_BE_INT_CLEAR1); + } else { + /* Caused by TC, really? */ + if (unlikely(!test_bit(i, virtbase + + COH901318_TC_INT_STATUS1))) { + dev_warn(COHC_2_DEV(cohc), + "ignoring interrupt not caused by terminal count on channel %d\n", ch); + /* Clear TC interrupt */ + BUG_ON(1); + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1); + } else { + /* Enable powersave if transfer has finished */ + if (!(readl(virtbase + COH901318_CX_STAT + + COH901318_CX_STAT_SPACING*ch) & + COH901318_CX_STAT_ENABLED)) { + enable_powersave(cohc); + } + + /* Must clear TC interrupt before calling + * dma_tc_handle + * in case tc_handle initiate a new dma job + */ + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR1); + + dma_tc_handle(cohc); + } + } + spin_unlock(&cohc->lock); + } + + /* Check the remaining 32 DMA channels for IRQ */ + while (status2) { + /* Find first bit set, return as a number. */ + i = ffs(status2) - 1; + ch = i + 32; + cohc = &base->chans[ch]; + spin_lock(&cohc->lock); + + /* Mask off this bit */ + status2 &= ~(1 << i); + /* Check the individual channel bits */ + if (test_bit(i, virtbase + COH901318_BE_INT_STATUS2)) { + dev_crit(COHC_2_DEV(cohc), + "DMA bus error on channel %d!\n", ch); + /* Clear BE interrupt */ + BUG_ON(1); + __set_bit(i, virtbase + COH901318_BE_INT_CLEAR2); + } else { + /* Caused by TC, really? */ + if (unlikely(!test_bit(i, virtbase + + COH901318_TC_INT_STATUS2))) { + dev_warn(COHC_2_DEV(cohc), + "ignoring interrupt not caused by terminal count on channel %d\n", ch); + /* Clear TC interrupt */ + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2); + BUG_ON(1); + } else { + /* Enable powersave if transfer has finished */ + if (!(readl(virtbase + COH901318_CX_STAT + + COH901318_CX_STAT_SPACING*ch) & + COH901318_CX_STAT_ENABLED)) { + enable_powersave(cohc); + } + /* Must clear TC interrupt before calling + * dma_tc_handle + * in case tc_handle initiate a new dma job + */ + __set_bit(i, virtbase + COH901318_TC_INT_CLEAR2); + + dma_tc_handle(cohc); + } + } + spin_unlock(&cohc->lock); + } + + return IRQ_HANDLED; +} + +static int coh901318_terminate_all(struct dma_chan *chan) +{ + unsigned long flags; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + struct coh901318_desc *cohd; + void __iomem *virtbase = cohc->base->virtbase; + + /* The remainder of this function terminates the transfer */ + coh901318_pause(chan); + spin_lock_irqsave(&cohc->lock, flags); + + /* Clear any pending BE or TC interrupt */ + if (cohc->id < 32) { + writel(1 << cohc->id, virtbase + COH901318_BE_INT_CLEAR1); + writel(1 << cohc->id, virtbase + COH901318_TC_INT_CLEAR1); + } else { + writel(1 << (cohc->id - 32), virtbase + + COH901318_BE_INT_CLEAR2); + writel(1 << (cohc->id - 32), virtbase + + COH901318_TC_INT_CLEAR2); + } + + enable_powersave(cohc); + + while ((cohd = coh901318_first_active_get(cohc))) { + /* release the lli allocation*/ + coh901318_lli_free(&cohc->base->pool, &cohd->lli); + + /* return desc to free-list */ + coh901318_desc_remove(cohd); + coh901318_desc_free(cohc, cohd); + } + + while ((cohd = coh901318_first_queued(cohc))) { + /* release the lli allocation*/ + coh901318_lli_free(&cohc->base->pool, &cohd->lli); + + /* return desc to free-list */ + coh901318_desc_remove(cohd); + coh901318_desc_free(cohc, cohd); + } + + + cohc->nbr_active_done = 0; + cohc->busy = 0; + + spin_unlock_irqrestore(&cohc->lock, flags); + + return 0; +} + +static int coh901318_alloc_chan_resources(struct dma_chan *chan) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + unsigned long flags; + + dev_vdbg(COHC_2_DEV(cohc), "[%s] DMA channel %d\n", + __func__, cohc->id); + + if (chan->client_count > 1) + return -EBUSY; + + spin_lock_irqsave(&cohc->lock, flags); + + coh901318_config(cohc, NULL); + + cohc->allocated = 1; + dma_cookie_init(chan); + + spin_unlock_irqrestore(&cohc->lock, flags); + + return 1; +} + +static void +coh901318_free_chan_resources(struct dma_chan *chan) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int channel = cohc->id; + unsigned long flags; + + spin_lock_irqsave(&cohc->lock, flags); + + /* Disable HW */ + writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CFG + + COH901318_CX_CFG_SPACING*channel); + writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CTRL + + COH901318_CX_CTRL_SPACING*channel); + + cohc->allocated = 0; + + spin_unlock_irqrestore(&cohc->lock, flags); + + coh901318_terminate_all(chan); +} + + +static dma_cookie_t +coh901318_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct coh901318_desc *cohd = container_of(tx, struct coh901318_desc, + desc); + struct coh901318_chan *cohc = to_coh901318_chan(tx->chan); + unsigned long flags; + dma_cookie_t cookie; + + spin_lock_irqsave(&cohc->lock, flags); + cookie = dma_cookie_assign(tx); + + coh901318_desc_queue(cohc, cohd); + + spin_unlock_irqrestore(&cohc->lock, flags); + + return cookie; +} + +static struct dma_async_tx_descriptor * +coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t size, unsigned long flags) +{ + struct coh901318_lli *lli; + struct coh901318_desc *cohd; + unsigned long flg; + struct coh901318_chan *cohc = to_coh901318_chan(chan); + int lli_len; + u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last; + int ret; + + spin_lock_irqsave(&cohc->lock, flg); + + dev_vdbg(COHC_2_DEV(cohc), + "[%s] channel %d src 0x%x dest 0x%x size %d\n", + __func__, cohc->id, src, dest, size); + + if (flags & DMA_PREP_INTERRUPT) + /* Trigger interrupt after last lli */ + ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE; + + lli_len = size >> MAX_DMA_PACKET_SIZE_SHIFT; + if ((lli_len << MAX_DMA_PACKET_SIZE_SHIFT) < size) + lli_len++; + + lli = coh901318_lli_alloc(&cohc->base->pool, lli_len); + + if (lli == NULL) + goto err; + + ret = coh901318_lli_fill_memcpy( + &cohc->base->pool, lli, src, size, dest, + cohc_chan_param(cohc)->ctrl_lli_chained, + ctrl_last); + if (ret) + goto err; + + COH_DBG(coh901318_list_print(cohc, lli)); + + /* Pick a descriptor to handle this transfer */ + cohd = coh901318_desc_get(cohc); + cohd->lli = lli; + cohd->flags = flags; + cohd->desc.tx_submit = coh901318_tx_submit; + + spin_unlock_irqrestore(&cohc->lock, flg); + + return &cohd->desc; + err: + spin_unlock_irqrestore(&cohc->lock, flg); + return NULL; +} + +static struct dma_async_tx_descriptor * +coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + struct coh901318_lli *lli; + struct coh901318_desc *cohd; + const struct coh901318_params *params; + struct scatterlist *sg; + int len = 0; + int size; + int i; + u32 ctrl_chained = cohc_chan_param(cohc)->ctrl_lli_chained; + u32 ctrl = cohc_chan_param(cohc)->ctrl_lli; + u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last; + u32 config; + unsigned long flg; + int ret; + + if (!sgl) + goto out; + if (sg_dma_len(sgl) == 0) + goto out; + + spin_lock_irqsave(&cohc->lock, flg); + + dev_vdbg(COHC_2_DEV(cohc), "[%s] sg_len %d dir %d\n", + __func__, sg_len, direction); + + if (flags & DMA_PREP_INTERRUPT) + /* Trigger interrupt after last lli */ + ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE; + + params = cohc_chan_param(cohc); + config = params->config; + /* + * Add runtime-specific control on top, make + * sure the bits you set per peripheral channel are + * cleared in the default config from the platform. + */ + ctrl_chained |= cohc->ctrl; + ctrl_last |= cohc->ctrl; + ctrl |= cohc->ctrl; + + if (direction == DMA_MEM_TO_DEV) { + u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE | + COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE; + + config |= COH901318_CX_CFG_RM_MEMORY_TO_PRIMARY; + ctrl_chained |= tx_flags; + ctrl_last |= tx_flags; + ctrl |= tx_flags; + } else if (direction == DMA_DEV_TO_MEM) { + u32 rx_flags = COH901318_CX_CTRL_PRDD_DEST | + COH901318_CX_CTRL_DST_ADDR_INC_ENABLE; + + config |= COH901318_CX_CFG_RM_PRIMARY_TO_MEMORY; + ctrl_chained |= rx_flags; + ctrl_last |= rx_flags; + ctrl |= rx_flags; + } else + goto err_direction; + + /* The dma only supports transmitting packages up to + * MAX_DMA_PACKET_SIZE. Calculate to total number of + * dma elemts required to send the entire sg list + */ + for_each_sg(sgl, sg, sg_len, i) { + unsigned int factor; + size = sg_dma_len(sg); + + if (size <= MAX_DMA_PACKET_SIZE) { + len++; + continue; + } + + factor = size >> MAX_DMA_PACKET_SIZE_SHIFT; + if ((factor << MAX_DMA_PACKET_SIZE_SHIFT) < size) + factor++; + + len += factor; + } + + pr_debug("Allocate %d lli:s for this transfer\n", len); + lli = coh901318_lli_alloc(&cohc->base->pool, len); + + if (lli == NULL) + goto err_dma_alloc; + + /* initiate allocated lli list */ + ret = coh901318_lli_fill_sg(&cohc->base->pool, lli, sgl, sg_len, + cohc->addr, + ctrl_chained, + ctrl, + ctrl_last, + direction, COH901318_CX_CTRL_TC_IRQ_ENABLE); + if (ret) + goto err_lli_fill; + + + COH_DBG(coh901318_list_print(cohc, lli)); + + /* Pick a descriptor to handle this transfer */ + cohd = coh901318_desc_get(cohc); + cohd->head_config = config; + /* + * Set the default head ctrl for the channel to the one from the + * lli, things may have changed due to odd buffer alignment + * etc. + */ + cohd->head_ctrl = lli->control; + cohd->dir = direction; + cohd->flags = flags; + cohd->desc.tx_submit = coh901318_tx_submit; + cohd->lli = lli; + + spin_unlock_irqrestore(&cohc->lock, flg); + + return &cohd->desc; + err_lli_fill: + err_dma_alloc: + err_direction: + spin_unlock_irqrestore(&cohc->lock, flg); + out: + return NULL; +} + +static enum dma_status +coh901318_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + enum dma_status ret; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + dma_set_residue(txstate, coh901318_get_bytes_left(chan)); + + if (ret == DMA_IN_PROGRESS && cohc->stopped) + ret = DMA_PAUSED; + + return ret; +} + +static void +coh901318_issue_pending(struct dma_chan *chan) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&cohc->lock, flags); + + /* + * Busy means that pending jobs are already being processed, + * and then there is no point in starting the queue: the + * terminal count interrupt on the channel will take the next + * job on the queue and execute it anyway. + */ + if (!cohc->busy) + coh901318_queue_start(cohc); + + spin_unlock_irqrestore(&cohc->lock, flags); +} + +/* + * Here we wrap in the runtime dma control interface + */ +struct burst_table { + int burst_8bit; + int burst_16bit; + int burst_32bit; + u32 reg; +}; + +static const struct burst_table burst_sizes[] = { + { + .burst_8bit = 64, + .burst_16bit = 32, + .burst_32bit = 16, + .reg = COH901318_CX_CTRL_BURST_COUNT_64_BYTES, + }, + { + .burst_8bit = 48, + .burst_16bit = 24, + .burst_32bit = 12, + .reg = COH901318_CX_CTRL_BURST_COUNT_48_BYTES, + }, + { + .burst_8bit = 32, + .burst_16bit = 16, + .burst_32bit = 8, + .reg = COH901318_CX_CTRL_BURST_COUNT_32_BYTES, + }, + { + .burst_8bit = 16, + .burst_16bit = 8, + .burst_32bit = 4, + .reg = COH901318_CX_CTRL_BURST_COUNT_16_BYTES, + }, + { + .burst_8bit = 8, + .burst_16bit = 4, + .burst_32bit = 2, + .reg = COH901318_CX_CTRL_BURST_COUNT_8_BYTES, + }, + { + .burst_8bit = 4, + .burst_16bit = 2, + .burst_32bit = 1, + .reg = COH901318_CX_CTRL_BURST_COUNT_4_BYTES, + }, + { + .burst_8bit = 2, + .burst_16bit = 1, + .burst_32bit = 0, + .reg = COH901318_CX_CTRL_BURST_COUNT_2_BYTES, + }, + { + .burst_8bit = 1, + .burst_16bit = 0, + .burst_32bit = 0, + .reg = COH901318_CX_CTRL_BURST_COUNT_1_BYTE, + }, +}; + +static int coh901318_dma_set_runtimeconfig(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct coh901318_chan *cohc = to_coh901318_chan(chan); + dma_addr_t addr; + enum dma_slave_buswidth addr_width; + u32 maxburst; + u32 ctrl = 0; + int i = 0; + + /* We only support mem to per or per to mem transfers */ + if (config->direction == DMA_DEV_TO_MEM) { + addr = config->src_addr; + addr_width = config->src_addr_width; + maxburst = config->src_maxburst; + } else if (config->direction == DMA_MEM_TO_DEV) { + addr = config->dst_addr; + addr_width = config->dst_addr_width; + maxburst = config->dst_maxburst; + } else { + dev_err(COHC_2_DEV(cohc), "illegal channel mode\n"); + return -EINVAL; + } + + dev_dbg(COHC_2_DEV(cohc), "configure channel for %d byte transfers\n", + addr_width); + switch (addr_width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + ctrl |= + COH901318_CX_CTRL_SRC_BUS_SIZE_8_BITS | + COH901318_CX_CTRL_DST_BUS_SIZE_8_BITS; + + while (i < ARRAY_SIZE(burst_sizes)) { + if (burst_sizes[i].burst_8bit <= maxburst) + break; + i++; + } + + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + ctrl |= + COH901318_CX_CTRL_SRC_BUS_SIZE_16_BITS | + COH901318_CX_CTRL_DST_BUS_SIZE_16_BITS; + + while (i < ARRAY_SIZE(burst_sizes)) { + if (burst_sizes[i].burst_16bit <= maxburst) + break; + i++; + } + + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + /* Direction doesn't matter here, it's 32/32 bits */ + ctrl |= + COH901318_CX_CTRL_SRC_BUS_SIZE_32_BITS | + COH901318_CX_CTRL_DST_BUS_SIZE_32_BITS; + + while (i < ARRAY_SIZE(burst_sizes)) { + if (burst_sizes[i].burst_32bit <= maxburst) + break; + i++; + } + + break; + default: + dev_err(COHC_2_DEV(cohc), + "bad runtimeconfig: alien address width\n"); + return -EINVAL; + } + + ctrl |= burst_sizes[i].reg; + dev_dbg(COHC_2_DEV(cohc), + "selected burst size %d bytes for address width %d bytes, maxburst %d\n", + burst_sizes[i].burst_8bit, addr_width, maxburst); + + cohc->addr = addr; + cohc->ctrl = ctrl; + + return 0; +} + +static void coh901318_base_init(struct dma_device *dma, const int *pick_chans, + struct coh901318_base *base) +{ + int chans_i; + int i = 0; + struct coh901318_chan *cohc; + + INIT_LIST_HEAD(&dma->channels); + + for (chans_i = 0; pick_chans[chans_i] != -1; chans_i += 2) { + for (i = pick_chans[chans_i]; i <= pick_chans[chans_i+1]; i++) { + cohc = &base->chans[i]; + + cohc->base = base; + cohc->chan.device = dma; + cohc->id = i; + + /* TODO: do we really need this lock if only one + * client is connected to each channel? + */ + + spin_lock_init(&cohc->lock); + + cohc->nbr_active_done = 0; + cohc->busy = 0; + INIT_LIST_HEAD(&cohc->free); + INIT_LIST_HEAD(&cohc->active); + INIT_LIST_HEAD(&cohc->queue); + + tasklet_init(&cohc->tasklet, dma_tasklet, + (unsigned long) cohc); + + list_add_tail(&cohc->chan.device_node, + &dma->channels); + } + } +} + +static int __init coh901318_probe(struct platform_device *pdev) +{ + int err = 0; + struct coh901318_base *base; + int irq; + struct resource *io; + + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!io) + return -ENODEV; + + /* Map DMA controller registers to virtual memory */ + if (devm_request_mem_region(&pdev->dev, + io->start, + resource_size(io), + pdev->dev.driver->name) == NULL) + return -ENOMEM; + + base = devm_kzalloc(&pdev->dev, + ALIGN(sizeof(struct coh901318_base), 4) + + U300_DMA_CHANNELS * + sizeof(struct coh901318_chan), + GFP_KERNEL); + if (!base) + return -ENOMEM; + + base->chans = ((void *)base) + ALIGN(sizeof(struct coh901318_base), 4); + + base->virtbase = devm_ioremap(&pdev->dev, io->start, resource_size(io)); + if (!base->virtbase) + return -ENOMEM; + + base->dev = &pdev->dev; + spin_lock_init(&base->pm.lock); + base->pm.started_channels = 0; + + COH901318_DEBUGFS_ASSIGN(debugfs_dma_base, base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + err = devm_request_irq(&pdev->dev, irq, dma_irq_handler, 0, + "coh901318", base); + if (err) + return err; + + err = coh901318_pool_create(&base->pool, &pdev->dev, + sizeof(struct coh901318_lli), + 32); + if (err) + return err; + + /* init channels for device transfers */ + coh901318_base_init(&base->dma_slave, dma_slave_channels, + base); + + dma_cap_zero(base->dma_slave.cap_mask); + dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask); + + base->dma_slave.device_alloc_chan_resources = coh901318_alloc_chan_resources; + base->dma_slave.device_free_chan_resources = coh901318_free_chan_resources; + base->dma_slave.device_prep_slave_sg = coh901318_prep_slave_sg; + base->dma_slave.device_tx_status = coh901318_tx_status; + base->dma_slave.device_issue_pending = coh901318_issue_pending; + base->dma_slave.device_config = coh901318_dma_set_runtimeconfig; + base->dma_slave.device_pause = coh901318_pause; + base->dma_slave.device_resume = coh901318_resume; + base->dma_slave.device_terminate_all = coh901318_terminate_all; + base->dma_slave.dev = &pdev->dev; + + err = dma_async_device_register(&base->dma_slave); + + if (err) + goto err_register_slave; + + /* init channels for memcpy */ + coh901318_base_init(&base->dma_memcpy, dma_memcpy_channels, + base); + + dma_cap_zero(base->dma_memcpy.cap_mask); + dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask); + + base->dma_memcpy.device_alloc_chan_resources = coh901318_alloc_chan_resources; + base->dma_memcpy.device_free_chan_resources = coh901318_free_chan_resources; + base->dma_memcpy.device_prep_dma_memcpy = coh901318_prep_memcpy; + base->dma_memcpy.device_tx_status = coh901318_tx_status; + base->dma_memcpy.device_issue_pending = coh901318_issue_pending; + base->dma_memcpy.device_config = coh901318_dma_set_runtimeconfig; + base->dma_memcpy.device_pause = coh901318_pause; + base->dma_memcpy.device_resume = coh901318_resume; + base->dma_memcpy.device_terminate_all = coh901318_terminate_all; + base->dma_memcpy.dev = &pdev->dev; + /* + * This controller can only access address at even 32bit boundaries, + * i.e. 2^2 + */ + base->dma_memcpy.copy_align = 2; + err = dma_async_device_register(&base->dma_memcpy); + + if (err) + goto err_register_memcpy; + + err = of_dma_controller_register(pdev->dev.of_node, coh901318_xlate, + base); + if (err) + goto err_register_of_dma; + + platform_set_drvdata(pdev, base); + dev_info(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n", + (u32) base->virtbase); + + return err; + + err_register_of_dma: + dma_async_device_unregister(&base->dma_memcpy); + err_register_memcpy: + dma_async_device_unregister(&base->dma_slave); + err_register_slave: + coh901318_pool_destroy(&base->pool); + return err; +} + +static int coh901318_remove(struct platform_device *pdev) +{ + struct coh901318_base *base = platform_get_drvdata(pdev); + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&base->dma_memcpy); + dma_async_device_unregister(&base->dma_slave); + coh901318_pool_destroy(&base->pool); + return 0; +} + +static const struct of_device_id coh901318_dt_match[] = { + { .compatible = "stericsson,coh901318" }, + {}, +}; + +static struct platform_driver coh901318_driver = { + .remove = coh901318_remove, + .driver = { + .name = "coh901318", + .of_match_table = coh901318_dt_match, + }, +}; + +int __init coh901318_init(void) +{ + return platform_driver_probe(&coh901318_driver, coh901318_probe); +} +subsys_initcall(coh901318_init); + +void __exit coh901318_exit(void) +{ + platform_driver_unregister(&coh901318_driver); +} +module_exit(coh901318_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Per Friden"); diff --git a/drivers/dma/coh901318.h b/drivers/dma/coh901318.h new file mode 100644 index 000000000..95ce1e212 --- /dev/null +++ b/drivers/dma/coh901318.h @@ -0,0 +1,141 @@ +/* + * Copyright (C) 2007-2013 ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + * DMA driver for COH 901 318 + * Author: Per Friden <per.friden@stericsson.com> + */ + +#ifndef COH901318_H +#define COH901318_H + +#define MAX_DMA_PACKET_SIZE_SHIFT 11 +#define MAX_DMA_PACKET_SIZE (1 << MAX_DMA_PACKET_SIZE_SHIFT) + +struct device; + +struct coh901318_pool { + spinlock_t lock; + struct dma_pool *dmapool; + struct device *dev; + +#ifdef CONFIG_DEBUG_FS + int debugfs_pool_counter; +#endif +}; + +/** + * struct coh901318_lli - linked list item for DMAC + * @control: control settings for DMAC + * @src_addr: transfer source address + * @dst_addr: transfer destination address + * @link_addr: physical address to next lli + * @virt_link_addr: virtual address of next lli (only used by pool_free) + * @phy_this: physical address of current lli (only used by pool_free) + */ +struct coh901318_lli { + u32 control; + dma_addr_t src_addr; + dma_addr_t dst_addr; + dma_addr_t link_addr; + + void *virt_link_addr; + dma_addr_t phy_this; +}; + +/** + * coh901318_pool_create() - Creates an dma pool for lli:s + * @pool: pool handle + * @dev: dma device + * @lli_nbr: number of lli:s in the pool + * @algin: address alignemtn of lli:s + * returns 0 on success otherwise none zero + */ +int coh901318_pool_create(struct coh901318_pool *pool, + struct device *dev, + size_t lli_nbr, size_t align); + +/** + * coh901318_pool_destroy() - Destroys the dma pool + * @pool: pool handle + * returns 0 on success otherwise none zero + */ +int coh901318_pool_destroy(struct coh901318_pool *pool); + +/** + * coh901318_lli_alloc() - Allocates a linked list + * + * @pool: pool handle + * @len: length to list + * return: none NULL if success otherwise NULL + */ +struct coh901318_lli * +coh901318_lli_alloc(struct coh901318_pool *pool, + unsigned int len); + +/** + * coh901318_lli_free() - Returns the linked list items to the pool + * @pool: pool handle + * @lli: reference to lli pointer to be freed + */ +void coh901318_lli_free(struct coh901318_pool *pool, + struct coh901318_lli **lli); + +/** + * coh901318_lli_fill_memcpy() - Prepares the lli:s for dma memcpy + * @pool: pool handle + * @lli: allocated lli + * @src: src address + * @size: transfer size + * @dst: destination address + * @ctrl_chained: ctrl for chained lli + * @ctrl_last: ctrl for the last lli + * returns number of CPU interrupts for the lli, negative on error. + */ +int +coh901318_lli_fill_memcpy(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t src, unsigned int size, + dma_addr_t dst, u32 ctrl_chained, u32 ctrl_last); + +/** + * coh901318_lli_fill_single() - Prepares the lli:s for dma single transfer + * @pool: pool handle + * @lli: allocated lli + * @buf: transfer buffer + * @size: transfer size + * @dev_addr: address of periphal + * @ctrl_chained: ctrl for chained lli + * @ctrl_last: ctrl for the last lli + * @dir: direction of transfer (to or from device) + * returns number of CPU interrupts for the lli, negative on error. + */ +int +coh901318_lli_fill_single(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t buf, unsigned int size, + dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_last, + enum dma_transfer_direction dir); + +/** + * coh901318_lli_fill_single() - Prepares the lli:s for dma scatter list transfer + * @pool: pool handle + * @lli: allocated lli + * @sg: scatter gather list + * @nents: number of entries in sg + * @dev_addr: address of periphal + * @ctrl_chained: ctrl for chained lli + * @ctrl: ctrl of middle lli + * @ctrl_last: ctrl for the last lli + * @dir: direction of transfer (to or from device) + * @ctrl_irq_mask: ctrl mask for CPU interrupt + * returns number of CPU interrupts for the lli, negative on error. + */ +int +coh901318_lli_fill_sg(struct coh901318_pool *pool, + struct coh901318_lli *lli, + struct scatterlist *sg, unsigned int nents, + dma_addr_t dev_addr, u32 ctrl_chained, + u32 ctrl, u32 ctrl_last, + enum dma_transfer_direction dir, u32 ctrl_irq_mask); + +#endif /* COH901318_H */ diff --git a/drivers/dma/coh901318_lli.c b/drivers/dma/coh901318_lli.c new file mode 100644 index 000000000..702112d54 --- /dev/null +++ b/drivers/dma/coh901318_lli.c @@ -0,0 +1,313 @@ +/* + * driver/dma/coh901318_lli.c + * + * Copyright (C) 2007-2009 ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + * Support functions for handling lli for dma + * Author: Per Friden <per.friden@stericsson.com> + */ + +#include <linux/spinlock.h> +#include <linux/memory.h> +#include <linux/gfp.h> +#include <linux/dmapool.h> +#include <linux/dmaengine.h> + +#include "coh901318.h" + +#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG)) +#define DEBUGFS_POOL_COUNTER_RESET(pool) (pool->debugfs_pool_counter = 0) +#define DEBUGFS_POOL_COUNTER_ADD(pool, add) (pool->debugfs_pool_counter += add) +#else +#define DEBUGFS_POOL_COUNTER_RESET(pool) +#define DEBUGFS_POOL_COUNTER_ADD(pool, add) +#endif + +static struct coh901318_lli * +coh901318_lli_next(struct coh901318_lli *data) +{ + if (data == NULL || data->link_addr == 0) + return NULL; + + return (struct coh901318_lli *) data->virt_link_addr; +} + +int coh901318_pool_create(struct coh901318_pool *pool, + struct device *dev, + size_t size, size_t align) +{ + spin_lock_init(&pool->lock); + pool->dev = dev; + pool->dmapool = dma_pool_create("lli_pool", dev, size, align, 0); + + DEBUGFS_POOL_COUNTER_RESET(pool); + return 0; +} + +int coh901318_pool_destroy(struct coh901318_pool *pool) +{ + + dma_pool_destroy(pool->dmapool); + return 0; +} + +struct coh901318_lli * +coh901318_lli_alloc(struct coh901318_pool *pool, unsigned int len) +{ + int i; + struct coh901318_lli *head; + struct coh901318_lli *lli; + struct coh901318_lli *lli_prev; + dma_addr_t phy; + + if (len == 0) + return NULL; + + spin_lock(&pool->lock); + + head = dma_pool_alloc(pool->dmapool, GFP_NOWAIT, &phy); + + if (head == NULL) + goto err; + + DEBUGFS_POOL_COUNTER_ADD(pool, 1); + + lli = head; + lli->phy_this = phy; + lli->link_addr = 0x00000000; + lli->virt_link_addr = 0x00000000U; + + for (i = 1; i < len; i++) { + lli_prev = lli; + + lli = dma_pool_alloc(pool->dmapool, GFP_NOWAIT, &phy); + + if (lli == NULL) + goto err_clean_up; + + DEBUGFS_POOL_COUNTER_ADD(pool, 1); + lli->phy_this = phy; + lli->link_addr = 0x00000000; + lli->virt_link_addr = 0x00000000U; + + lli_prev->link_addr = phy; + lli_prev->virt_link_addr = lli; + } + + spin_unlock(&pool->lock); + + return head; + + err: + spin_unlock(&pool->lock); + return NULL; + + err_clean_up: + lli_prev->link_addr = 0x00000000U; + spin_unlock(&pool->lock); + coh901318_lli_free(pool, &head); + return NULL; +} + +void coh901318_lli_free(struct coh901318_pool *pool, + struct coh901318_lli **lli) +{ + struct coh901318_lli *l; + struct coh901318_lli *next; + + if (lli == NULL) + return; + + l = *lli; + + if (l == NULL) + return; + + spin_lock(&pool->lock); + + while (l->link_addr) { + next = l->virt_link_addr; + dma_pool_free(pool->dmapool, l, l->phy_this); + DEBUGFS_POOL_COUNTER_ADD(pool, -1); + l = next; + } + dma_pool_free(pool->dmapool, l, l->phy_this); + DEBUGFS_POOL_COUNTER_ADD(pool, -1); + + spin_unlock(&pool->lock); + *lli = NULL; +} + +int +coh901318_lli_fill_memcpy(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t source, unsigned int size, + dma_addr_t destination, u32 ctrl_chained, + u32 ctrl_eom) +{ + int s = size; + dma_addr_t src = source; + dma_addr_t dst = destination; + + lli->src_addr = src; + lli->dst_addr = dst; + + while (lli->link_addr) { + lli->control = ctrl_chained | MAX_DMA_PACKET_SIZE; + lli->src_addr = src; + lli->dst_addr = dst; + + s -= MAX_DMA_PACKET_SIZE; + lli = coh901318_lli_next(lli); + + src += MAX_DMA_PACKET_SIZE; + dst += MAX_DMA_PACKET_SIZE; + } + + lli->control = ctrl_eom | s; + lli->src_addr = src; + lli->dst_addr = dst; + + return 0; +} + +int +coh901318_lli_fill_single(struct coh901318_pool *pool, + struct coh901318_lli *lli, + dma_addr_t buf, unsigned int size, + dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl_eom, + enum dma_transfer_direction dir) +{ + int s = size; + dma_addr_t src; + dma_addr_t dst; + + + if (dir == DMA_MEM_TO_DEV) { + src = buf; + dst = dev_addr; + + } else if (dir == DMA_DEV_TO_MEM) { + + src = dev_addr; + dst = buf; + } else { + return -EINVAL; + } + + while (lli->link_addr) { + size_t block_size = MAX_DMA_PACKET_SIZE; + lli->control = ctrl_chained | MAX_DMA_PACKET_SIZE; + + /* If we are on the next-to-final block and there will + * be less than half a DMA packet left for the last + * block, then we want to make this block a little + * smaller to balance the sizes. This is meant to + * avoid too small transfers if the buffer size is + * (MAX_DMA_PACKET_SIZE*N + 1) */ + if (s < (MAX_DMA_PACKET_SIZE + MAX_DMA_PACKET_SIZE/2)) + block_size = MAX_DMA_PACKET_SIZE/2; + + s -= block_size; + lli->src_addr = src; + lli->dst_addr = dst; + + lli = coh901318_lli_next(lli); + + if (dir == DMA_MEM_TO_DEV) + src += block_size; + else if (dir == DMA_DEV_TO_MEM) + dst += block_size; + } + + lli->control = ctrl_eom | s; + lli->src_addr = src; + lli->dst_addr = dst; + + return 0; +} + +int +coh901318_lli_fill_sg(struct coh901318_pool *pool, + struct coh901318_lli *lli, + struct scatterlist *sgl, unsigned int nents, + dma_addr_t dev_addr, u32 ctrl_chained, u32 ctrl, + u32 ctrl_last, + enum dma_transfer_direction dir, u32 ctrl_irq_mask) +{ + int i; + struct scatterlist *sg; + u32 ctrl_sg; + dma_addr_t src = 0; + dma_addr_t dst = 0; + u32 bytes_to_transfer; + u32 elem_size; + + if (lli == NULL) + goto err; + + spin_lock(&pool->lock); + + if (dir == DMA_MEM_TO_DEV) + dst = dev_addr; + else if (dir == DMA_DEV_TO_MEM) + src = dev_addr; + else + goto err; + + for_each_sg(sgl, sg, nents, i) { + if (sg_is_chain(sg)) { + /* sg continues to the next sg-element don't + * send ctrl_finish until the last + * sg-element in the chain + */ + ctrl_sg = ctrl_chained; + } else if (i == nents - 1) + ctrl_sg = ctrl_last; + else + ctrl_sg = ctrl ? ctrl : ctrl_last; + + + if (dir == DMA_MEM_TO_DEV) + /* increment source address */ + src = sg_dma_address(sg); + else + /* increment destination address */ + dst = sg_dma_address(sg); + + bytes_to_transfer = sg_dma_len(sg); + + while (bytes_to_transfer) { + u32 val; + + if (bytes_to_transfer > MAX_DMA_PACKET_SIZE) { + elem_size = MAX_DMA_PACKET_SIZE; + val = ctrl_chained; + } else { + elem_size = bytes_to_transfer; + val = ctrl_sg; + } + + lli->control = val | elem_size; + lli->src_addr = src; + lli->dst_addr = dst; + + if (dir == DMA_DEV_TO_MEM) + dst += elem_size; + else + src += elem_size; + + BUG_ON(lli->link_addr & 3); + + bytes_to_transfer -= elem_size; + lli = coh901318_lli_next(lli); + } + + } + spin_unlock(&pool->lock); + + return 0; + err: + spin_unlock(&pool->lock); + return -EINVAL; +} diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c new file mode 100644 index 000000000..ceedafbd2 --- /dev/null +++ b/drivers/dma/cppi41.c @@ -0,0 +1,1084 @@ +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/slab.h> +#include <linux/of_dma.h> +#include <linux/of_irq.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/of_address.h> +#include <linux/pm_runtime.h> +#include "dmaengine.h" + +#define DESC_TYPE 27 +#define DESC_TYPE_HOST 0x10 +#define DESC_TYPE_TEARD 0x13 + +#define TD_DESC_IS_RX (1 << 16) +#define TD_DESC_DMA_NUM 10 + +#define DESC_LENGTH_BITS_NUM 21 + +#define DESC_TYPE_USB (5 << 26) +#define DESC_PD_COMPLETE (1 << 31) + +/* DMA engine */ +#define DMA_TDFDQ 4 +#define DMA_TXGCR(x) (0x800 + (x) * 0x20) +#define DMA_RXGCR(x) (0x808 + (x) * 0x20) +#define RXHPCRA0 4 + +#define GCR_CHAN_ENABLE (1 << 31) +#define GCR_TEARDOWN (1 << 30) +#define GCR_STARV_RETRY (1 << 24) +#define GCR_DESC_TYPE_HOST (1 << 14) + +/* DMA scheduler */ +#define DMA_SCHED_CTRL 0 +#define DMA_SCHED_CTRL_EN (1 << 31) +#define DMA_SCHED_WORD(x) ((x) * 4 + 0x800) + +#define SCHED_ENTRY0_CHAN(x) ((x) << 0) +#define SCHED_ENTRY0_IS_RX (1 << 7) + +#define SCHED_ENTRY1_CHAN(x) ((x) << 8) +#define SCHED_ENTRY1_IS_RX (1 << 15) + +#define SCHED_ENTRY2_CHAN(x) ((x) << 16) +#define SCHED_ENTRY2_IS_RX (1 << 23) + +#define SCHED_ENTRY3_CHAN(x) ((x) << 24) +#define SCHED_ENTRY3_IS_RX (1 << 31) + +/* Queue manager */ +/* 4 KiB of memory for descriptors, 2 for each endpoint */ +#define ALLOC_DECS_NUM 128 +#define DESCS_AREAS 1 +#define TOTAL_DESCS_NUM (ALLOC_DECS_NUM * DESCS_AREAS) +#define QMGR_SCRATCH_SIZE (TOTAL_DESCS_NUM * 4) + +#define QMGR_LRAM0_BASE 0x80 +#define QMGR_LRAM_SIZE 0x84 +#define QMGR_LRAM1_BASE 0x88 +#define QMGR_MEMBASE(x) (0x1000 + (x) * 0x10) +#define QMGR_MEMCTRL(x) (0x1004 + (x) * 0x10) +#define QMGR_MEMCTRL_IDX_SH 16 +#define QMGR_MEMCTRL_DESC_SH 8 + +#define QMGR_NUM_PEND 5 +#define QMGR_PEND(x) (0x90 + (x) * 4) + +#define QMGR_PENDING_SLOT_Q(x) (x / 32) +#define QMGR_PENDING_BIT_Q(x) (x % 32) + +#define QMGR_QUEUE_A(n) (0x2000 + (n) * 0x10) +#define QMGR_QUEUE_B(n) (0x2004 + (n) * 0x10) +#define QMGR_QUEUE_C(n) (0x2008 + (n) * 0x10) +#define QMGR_QUEUE_D(n) (0x200c + (n) * 0x10) + +/* Glue layer specific */ +/* USBSS / USB AM335x */ +#define USBSS_IRQ_STATUS 0x28 +#define USBSS_IRQ_ENABLER 0x2c +#define USBSS_IRQ_CLEARR 0x30 + +#define USBSS_IRQ_PD_COMP (1 << 2) + +/* Packet Descriptor */ +#define PD2_ZERO_LENGTH (1 << 19) + +struct cppi41_channel { + struct dma_chan chan; + struct dma_async_tx_descriptor txd; + struct cppi41_dd *cdd; + struct cppi41_desc *desc; + dma_addr_t desc_phys; + void __iomem *gcr_reg; + int is_tx; + u32 residue; + + unsigned int q_num; + unsigned int q_comp_num; + unsigned int port_num; + + unsigned td_retry; + unsigned td_queued:1; + unsigned td_seen:1; + unsigned td_desc_seen:1; +}; + +struct cppi41_desc { + u32 pd0; + u32 pd1; + u32 pd2; + u32 pd3; + u32 pd4; + u32 pd5; + u32 pd6; + u32 pd7; +} __aligned(32); + +struct chan_queues { + u16 submit; + u16 complete; +}; + +struct cppi41_dd { + struct dma_device ddev; + + void *qmgr_scratch; + dma_addr_t scratch_phys; + + struct cppi41_desc *cd; + dma_addr_t descs_phys; + u32 first_td_desc; + struct cppi41_channel *chan_busy[ALLOC_DECS_NUM]; + + void __iomem *usbss_mem; + void __iomem *ctrl_mem; + void __iomem *sched_mem; + void __iomem *qmgr_mem; + unsigned int irq; + const struct chan_queues *queues_rx; + const struct chan_queues *queues_tx; + struct chan_queues td_queue; + + /* context for suspend/resume */ + unsigned int dma_tdfdq; +}; + +#define FIST_COMPLETION_QUEUE 93 +static struct chan_queues usb_queues_tx[] = { + /* USB0 ENDP 1 */ + [ 0] = { .submit = 32, .complete = 93}, + [ 1] = { .submit = 34, .complete = 94}, + [ 2] = { .submit = 36, .complete = 95}, + [ 3] = { .submit = 38, .complete = 96}, + [ 4] = { .submit = 40, .complete = 97}, + [ 5] = { .submit = 42, .complete = 98}, + [ 6] = { .submit = 44, .complete = 99}, + [ 7] = { .submit = 46, .complete = 100}, + [ 8] = { .submit = 48, .complete = 101}, + [ 9] = { .submit = 50, .complete = 102}, + [10] = { .submit = 52, .complete = 103}, + [11] = { .submit = 54, .complete = 104}, + [12] = { .submit = 56, .complete = 105}, + [13] = { .submit = 58, .complete = 106}, + [14] = { .submit = 60, .complete = 107}, + + /* USB1 ENDP1 */ + [15] = { .submit = 62, .complete = 125}, + [16] = { .submit = 64, .complete = 126}, + [17] = { .submit = 66, .complete = 127}, + [18] = { .submit = 68, .complete = 128}, + [19] = { .submit = 70, .complete = 129}, + [20] = { .submit = 72, .complete = 130}, + [21] = { .submit = 74, .complete = 131}, + [22] = { .submit = 76, .complete = 132}, + [23] = { .submit = 78, .complete = 133}, + [24] = { .submit = 80, .complete = 134}, + [25] = { .submit = 82, .complete = 135}, + [26] = { .submit = 84, .complete = 136}, + [27] = { .submit = 86, .complete = 137}, + [28] = { .submit = 88, .complete = 138}, + [29] = { .submit = 90, .complete = 139}, +}; + +static const struct chan_queues usb_queues_rx[] = { + /* USB0 ENDP 1 */ + [ 0] = { .submit = 1, .complete = 109}, + [ 1] = { .submit = 2, .complete = 110}, + [ 2] = { .submit = 3, .complete = 111}, + [ 3] = { .submit = 4, .complete = 112}, + [ 4] = { .submit = 5, .complete = 113}, + [ 5] = { .submit = 6, .complete = 114}, + [ 6] = { .submit = 7, .complete = 115}, + [ 7] = { .submit = 8, .complete = 116}, + [ 8] = { .submit = 9, .complete = 117}, + [ 9] = { .submit = 10, .complete = 118}, + [10] = { .submit = 11, .complete = 119}, + [11] = { .submit = 12, .complete = 120}, + [12] = { .submit = 13, .complete = 121}, + [13] = { .submit = 14, .complete = 122}, + [14] = { .submit = 15, .complete = 123}, + + /* USB1 ENDP 1 */ + [15] = { .submit = 16, .complete = 141}, + [16] = { .submit = 17, .complete = 142}, + [17] = { .submit = 18, .complete = 143}, + [18] = { .submit = 19, .complete = 144}, + [19] = { .submit = 20, .complete = 145}, + [20] = { .submit = 21, .complete = 146}, + [21] = { .submit = 22, .complete = 147}, + [22] = { .submit = 23, .complete = 148}, + [23] = { .submit = 24, .complete = 149}, + [24] = { .submit = 25, .complete = 150}, + [25] = { .submit = 26, .complete = 151}, + [26] = { .submit = 27, .complete = 152}, + [27] = { .submit = 28, .complete = 153}, + [28] = { .submit = 29, .complete = 154}, + [29] = { .submit = 30, .complete = 155}, +}; + +struct cppi_glue_infos { + irqreturn_t (*isr)(int irq, void *data); + const struct chan_queues *queues_rx; + const struct chan_queues *queues_tx; + struct chan_queues td_queue; +}; + +static struct cppi41_channel *to_cpp41_chan(struct dma_chan *c) +{ + return container_of(c, struct cppi41_channel, chan); +} + +static struct cppi41_channel *desc_to_chan(struct cppi41_dd *cdd, u32 desc) +{ + struct cppi41_channel *c; + u32 descs_size; + u32 desc_num; + + descs_size = sizeof(struct cppi41_desc) * ALLOC_DECS_NUM; + + if (!((desc >= cdd->descs_phys) && + (desc < (cdd->descs_phys + descs_size)))) { + return NULL; + } + + desc_num = (desc - cdd->descs_phys) / sizeof(struct cppi41_desc); + BUG_ON(desc_num >= ALLOC_DECS_NUM); + c = cdd->chan_busy[desc_num]; + cdd->chan_busy[desc_num] = NULL; + return c; +} + +static void cppi_writel(u32 val, void *__iomem *mem) +{ + __raw_writel(val, mem); +} + +static u32 cppi_readl(void *__iomem *mem) +{ + return __raw_readl(mem); +} + +static u32 pd_trans_len(u32 val) +{ + return val & ((1 << (DESC_LENGTH_BITS_NUM + 1)) - 1); +} + +static u32 cppi41_pop_desc(struct cppi41_dd *cdd, unsigned queue_num) +{ + u32 desc; + + desc = cppi_readl(cdd->qmgr_mem + QMGR_QUEUE_D(queue_num)); + desc &= ~0x1f; + return desc; +} + +static irqreturn_t cppi41_irq(int irq, void *data) +{ + struct cppi41_dd *cdd = data; + struct cppi41_channel *c; + u32 status; + int i; + + status = cppi_readl(cdd->usbss_mem + USBSS_IRQ_STATUS); + if (!(status & USBSS_IRQ_PD_COMP)) + return IRQ_NONE; + cppi_writel(status, cdd->usbss_mem + USBSS_IRQ_STATUS); + + for (i = QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE); i < QMGR_NUM_PEND; + i++) { + u32 val; + u32 q_num; + + val = cppi_readl(cdd->qmgr_mem + QMGR_PEND(i)); + if (i == QMGR_PENDING_SLOT_Q(FIST_COMPLETION_QUEUE) && val) { + u32 mask; + /* set corresponding bit for completetion Q 93 */ + mask = 1 << QMGR_PENDING_BIT_Q(FIST_COMPLETION_QUEUE); + /* not set all bits for queues less than Q 93 */ + mask--; + /* now invert and keep only Q 93+ set */ + val &= ~mask; + } + + if (val) + __iormb(); + + while (val) { + u32 desc, len; + + q_num = __fls(val); + val &= ~(1 << q_num); + q_num += 32 * i; + desc = cppi41_pop_desc(cdd, q_num); + c = desc_to_chan(cdd, desc); + if (WARN_ON(!c)) { + pr_err("%s() q %d desc %08x\n", __func__, + q_num, desc); + continue; + } + + if (c->desc->pd2 & PD2_ZERO_LENGTH) + len = 0; + else + len = pd_trans_len(c->desc->pd0); + + c->residue = pd_trans_len(c->desc->pd6) - len; + dma_cookie_complete(&c->txd); + c->txd.callback(c->txd.callback_param); + } + } + return IRQ_HANDLED; +} + +static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx) +{ + dma_cookie_t cookie; + + cookie = dma_cookie_assign(tx); + + return cookie; +} + +static int cppi41_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct cppi41_channel *c = to_cpp41_chan(chan); + + dma_cookie_init(chan); + dma_async_tx_descriptor_init(&c->txd, chan); + c->txd.tx_submit = cppi41_tx_submit; + + if (!c->is_tx) + cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0); + + return 0; +} + +static void cppi41_dma_free_chan_resources(struct dma_chan *chan) +{ +} + +static enum dma_status cppi41_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct cppi41_channel *c = to_cpp41_chan(chan); + enum dma_status ret; + + /* lock */ + ret = dma_cookie_status(chan, cookie, txstate); + if (txstate && ret == DMA_COMPLETE) + txstate->residue = c->residue; + /* unlock */ + + return ret; +} + +static void push_desc_queue(struct cppi41_channel *c) +{ + struct cppi41_dd *cdd = c->cdd; + u32 desc_num; + u32 desc_phys; + u32 reg; + + desc_phys = lower_32_bits(c->desc_phys); + desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc); + WARN_ON(cdd->chan_busy[desc_num]); + cdd->chan_busy[desc_num] = c; + + reg = (sizeof(struct cppi41_desc) - 24) / 4; + reg |= desc_phys; + cppi_writel(reg, cdd->qmgr_mem + QMGR_QUEUE_D(c->q_num)); +} + +static void cppi41_dma_issue_pending(struct dma_chan *chan) +{ + struct cppi41_channel *c = to_cpp41_chan(chan); + u32 reg; + + c->residue = 0; + + reg = GCR_CHAN_ENABLE; + if (!c->is_tx) { + reg |= GCR_STARV_RETRY; + reg |= GCR_DESC_TYPE_HOST; + reg |= c->q_comp_num; + } + + cppi_writel(reg, c->gcr_reg); + + /* + * We don't use writel() but __raw_writel() so we have to make sure + * that the DMA descriptor in coherent memory made to the main memory + * before starting the dma engine. + */ + __iowmb(); + push_desc_queue(c); +} + +static u32 get_host_pd0(u32 length) +{ + u32 reg; + + reg = DESC_TYPE_HOST << DESC_TYPE; + reg |= length; + + return reg; +} + +static u32 get_host_pd1(struct cppi41_channel *c) +{ + u32 reg; + + reg = 0; + + return reg; +} + +static u32 get_host_pd2(struct cppi41_channel *c) +{ + u32 reg; + + reg = DESC_TYPE_USB; + reg |= c->q_comp_num; + + return reg; +} + +static u32 get_host_pd3(u32 length) +{ + u32 reg; + + /* PD3 = packet size */ + reg = length; + + return reg; +} + +static u32 get_host_pd6(u32 length) +{ + u32 reg; + + /* PD6 buffer size */ + reg = DESC_PD_COMPLETE; + reg |= length; + + return reg; +} + +static u32 get_host_pd4_or_7(u32 addr) +{ + u32 reg; + + reg = addr; + + return reg; +} + +static u32 get_host_pd5(void) +{ + u32 reg; + + reg = 0; + + return reg; +} + +static struct dma_async_tx_descriptor *cppi41_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, unsigned sg_len, + enum dma_transfer_direction dir, unsigned long tx_flags, void *context) +{ + struct cppi41_channel *c = to_cpp41_chan(chan); + struct cppi41_desc *d; + struct scatterlist *sg; + unsigned int i; + unsigned int num; + + num = 0; + d = c->desc; + for_each_sg(sgl, sg, sg_len, i) { + u32 addr; + u32 len; + + /* We need to use more than one desc once musb supports sg */ + BUG_ON(num > 0); + addr = lower_32_bits(sg_dma_address(sg)); + len = sg_dma_len(sg); + + d->pd0 = get_host_pd0(len); + d->pd1 = get_host_pd1(c); + d->pd2 = get_host_pd2(c); + d->pd3 = get_host_pd3(len); + d->pd4 = get_host_pd4_or_7(addr); + d->pd5 = get_host_pd5(); + d->pd6 = get_host_pd6(len); + d->pd7 = get_host_pd4_or_7(addr); + + d++; + } + + return &c->txd; +} + +static void cppi41_compute_td_desc(struct cppi41_desc *d) +{ + d->pd0 = DESC_TYPE_TEARD << DESC_TYPE; +} + +static int cppi41_tear_down_chan(struct cppi41_channel *c) +{ + struct cppi41_dd *cdd = c->cdd; + struct cppi41_desc *td; + u32 reg; + u32 desc_phys; + u32 td_desc_phys; + + td = cdd->cd; + td += cdd->first_td_desc; + + td_desc_phys = cdd->descs_phys; + td_desc_phys += cdd->first_td_desc * sizeof(struct cppi41_desc); + + if (!c->td_queued) { + cppi41_compute_td_desc(td); + __iowmb(); + + reg = (sizeof(struct cppi41_desc) - 24) / 4; + reg |= td_desc_phys; + cppi_writel(reg, cdd->qmgr_mem + + QMGR_QUEUE_D(cdd->td_queue.submit)); + + reg = GCR_CHAN_ENABLE; + if (!c->is_tx) { + reg |= GCR_STARV_RETRY; + reg |= GCR_DESC_TYPE_HOST; + reg |= c->q_comp_num; + } + reg |= GCR_TEARDOWN; + cppi_writel(reg, c->gcr_reg); + c->td_queued = 1; + c->td_retry = 500; + } + + if (!c->td_seen || !c->td_desc_seen) { + + desc_phys = cppi41_pop_desc(cdd, cdd->td_queue.complete); + if (!desc_phys) + desc_phys = cppi41_pop_desc(cdd, c->q_comp_num); + + if (desc_phys == c->desc_phys) { + c->td_desc_seen = 1; + + } else if (desc_phys == td_desc_phys) { + u32 pd0; + + __iormb(); + pd0 = td->pd0; + WARN_ON((pd0 >> DESC_TYPE) != DESC_TYPE_TEARD); + WARN_ON(!c->is_tx && !(pd0 & TD_DESC_IS_RX)); + WARN_ON((pd0 & 0x1f) != c->port_num); + c->td_seen = 1; + } else if (desc_phys) { + WARN_ON_ONCE(1); + } + } + c->td_retry--; + /* + * If the TX descriptor / channel is in use, the caller needs to poke + * his TD bit multiple times. After that he hardware releases the + * transfer descriptor followed by TD descriptor. Waiting seems not to + * cause any difference. + * RX seems to be thrown out right away. However once the TearDown + * descriptor gets through we are done. If we have seens the transfer + * descriptor before the TD we fetch it from enqueue, it has to be + * there waiting for us. + */ + if (!c->td_seen && c->td_retry) { + udelay(1); + return -EAGAIN; + } + WARN_ON(!c->td_retry); + + if (!c->td_desc_seen) { + desc_phys = cppi41_pop_desc(cdd, c->q_num); + if (!desc_phys) + desc_phys = cppi41_pop_desc(cdd, c->q_comp_num); + WARN_ON(!desc_phys); + } + + c->td_queued = 0; + c->td_seen = 0; + c->td_desc_seen = 0; + cppi_writel(0, c->gcr_reg); + return 0; +} + +static int cppi41_stop_chan(struct dma_chan *chan) +{ + struct cppi41_channel *c = to_cpp41_chan(chan); + struct cppi41_dd *cdd = c->cdd; + u32 desc_num; + u32 desc_phys; + int ret; + + desc_phys = lower_32_bits(c->desc_phys); + desc_num = (desc_phys - cdd->descs_phys) / sizeof(struct cppi41_desc); + if (!cdd->chan_busy[desc_num]) + return 0; + + ret = cppi41_tear_down_chan(c); + if (ret) + return ret; + + WARN_ON(!cdd->chan_busy[desc_num]); + cdd->chan_busy[desc_num] = NULL; + + return 0; +} + +static void cleanup_chans(struct cppi41_dd *cdd) +{ + while (!list_empty(&cdd->ddev.channels)) { + struct cppi41_channel *cchan; + + cchan = list_first_entry(&cdd->ddev.channels, + struct cppi41_channel, chan.device_node); + list_del(&cchan->chan.device_node); + kfree(cchan); + } +} + +static int cppi41_add_chans(struct device *dev, struct cppi41_dd *cdd) +{ + struct cppi41_channel *cchan; + int i; + int ret; + u32 n_chans; + + ret = of_property_read_u32(dev->of_node, "#dma-channels", + &n_chans); + if (ret) + return ret; + /* + * The channels can only be used as TX or as RX. So we add twice + * that much dma channels because USB can only do RX or TX. + */ + n_chans *= 2; + + for (i = 0; i < n_chans; i++) { + cchan = kzalloc(sizeof(*cchan), GFP_KERNEL); + if (!cchan) + goto err; + + cchan->cdd = cdd; + if (i & 1) { + cchan->gcr_reg = cdd->ctrl_mem + DMA_TXGCR(i >> 1); + cchan->is_tx = 1; + } else { + cchan->gcr_reg = cdd->ctrl_mem + DMA_RXGCR(i >> 1); + cchan->is_tx = 0; + } + cchan->port_num = i >> 1; + cchan->desc = &cdd->cd[i]; + cchan->desc_phys = cdd->descs_phys; + cchan->desc_phys += i * sizeof(struct cppi41_desc); + cchan->chan.device = &cdd->ddev; + list_add_tail(&cchan->chan.device_node, &cdd->ddev.channels); + } + cdd->first_td_desc = n_chans; + + return 0; +err: + cleanup_chans(cdd); + return -ENOMEM; +} + +static void purge_descs(struct device *dev, struct cppi41_dd *cdd) +{ + unsigned int mem_decs; + int i; + + mem_decs = ALLOC_DECS_NUM * sizeof(struct cppi41_desc); + + for (i = 0; i < DESCS_AREAS; i++) { + + cppi_writel(0, cdd->qmgr_mem + QMGR_MEMBASE(i)); + cppi_writel(0, cdd->qmgr_mem + QMGR_MEMCTRL(i)); + + dma_free_coherent(dev, mem_decs, cdd->cd, + cdd->descs_phys); + } +} + +static void disable_sched(struct cppi41_dd *cdd) +{ + cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL); +} + +static void deinit_cppi41(struct device *dev, struct cppi41_dd *cdd) +{ + disable_sched(cdd); + + purge_descs(dev, cdd); + + cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE); + cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM0_BASE); + dma_free_coherent(dev, QMGR_SCRATCH_SIZE, cdd->qmgr_scratch, + cdd->scratch_phys); +} + +static int init_descs(struct device *dev, struct cppi41_dd *cdd) +{ + unsigned int desc_size; + unsigned int mem_decs; + int i; + u32 reg; + u32 idx; + + BUILD_BUG_ON(sizeof(struct cppi41_desc) & + (sizeof(struct cppi41_desc) - 1)); + BUILD_BUG_ON(sizeof(struct cppi41_desc) < 32); + BUILD_BUG_ON(ALLOC_DECS_NUM < 32); + + desc_size = sizeof(struct cppi41_desc); + mem_decs = ALLOC_DECS_NUM * desc_size; + + idx = 0; + for (i = 0; i < DESCS_AREAS; i++) { + + reg = idx << QMGR_MEMCTRL_IDX_SH; + reg |= (ilog2(desc_size) - 5) << QMGR_MEMCTRL_DESC_SH; + reg |= ilog2(ALLOC_DECS_NUM) - 5; + + BUILD_BUG_ON(DESCS_AREAS != 1); + cdd->cd = dma_alloc_coherent(dev, mem_decs, + &cdd->descs_phys, GFP_KERNEL); + if (!cdd->cd) + return -ENOMEM; + + cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i)); + cppi_writel(reg, cdd->qmgr_mem + QMGR_MEMCTRL(i)); + + idx += ALLOC_DECS_NUM; + } + return 0; +} + +static void init_sched(struct cppi41_dd *cdd) +{ + unsigned ch; + unsigned word; + u32 reg; + + word = 0; + cppi_writel(0, cdd->sched_mem + DMA_SCHED_CTRL); + for (ch = 0; ch < 15 * 2; ch += 2) { + + reg = SCHED_ENTRY0_CHAN(ch); + reg |= SCHED_ENTRY1_CHAN(ch) | SCHED_ENTRY1_IS_RX; + + reg |= SCHED_ENTRY2_CHAN(ch + 1); + reg |= SCHED_ENTRY3_CHAN(ch + 1) | SCHED_ENTRY3_IS_RX; + cppi_writel(reg, cdd->sched_mem + DMA_SCHED_WORD(word)); + word++; + } + reg = 15 * 2 * 2 - 1; + reg |= DMA_SCHED_CTRL_EN; + cppi_writel(reg, cdd->sched_mem + DMA_SCHED_CTRL); +} + +static int init_cppi41(struct device *dev, struct cppi41_dd *cdd) +{ + int ret; + + BUILD_BUG_ON(QMGR_SCRATCH_SIZE > ((1 << 14) - 1)); + cdd->qmgr_scratch = dma_alloc_coherent(dev, QMGR_SCRATCH_SIZE, + &cdd->scratch_phys, GFP_KERNEL); + if (!cdd->qmgr_scratch) + return -ENOMEM; + + cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE); + cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE); + cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE); + + ret = init_descs(dev, cdd); + if (ret) + goto err_td; + + cppi_writel(cdd->td_queue.submit, cdd->ctrl_mem + DMA_TDFDQ); + init_sched(cdd); + return 0; +err_td: + deinit_cppi41(dev, cdd); + return ret; +} + +static struct platform_driver cpp41_dma_driver; +/* + * The param format is: + * X Y + * X: Port + * Y: 0 = RX else TX + */ +#define INFO_PORT 0 +#define INFO_IS_TX 1 + +static bool cpp41_dma_filter_fn(struct dma_chan *chan, void *param) +{ + struct cppi41_channel *cchan; + struct cppi41_dd *cdd; + const struct chan_queues *queues; + u32 *num = param; + + if (chan->device->dev->driver != &cpp41_dma_driver.driver) + return false; + + cchan = to_cpp41_chan(chan); + + if (cchan->port_num != num[INFO_PORT]) + return false; + + if (cchan->is_tx && !num[INFO_IS_TX]) + return false; + cdd = cchan->cdd; + if (cchan->is_tx) + queues = cdd->queues_tx; + else + queues = cdd->queues_rx; + + BUILD_BUG_ON(ARRAY_SIZE(usb_queues_rx) != ARRAY_SIZE(usb_queues_tx)); + if (WARN_ON(cchan->port_num > ARRAY_SIZE(usb_queues_rx))) + return false; + + cchan->q_num = queues[cchan->port_num].submit; + cchan->q_comp_num = queues[cchan->port_num].complete; + return true; +} + +static struct of_dma_filter_info cpp41_dma_info = { + .filter_fn = cpp41_dma_filter_fn, +}; + +static struct dma_chan *cppi41_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + int count = dma_spec->args_count; + struct of_dma_filter_info *info = ofdma->of_dma_data; + + if (!info || !info->filter_fn) + return NULL; + + if (count != 2) + return NULL; + + return dma_request_channel(info->dma_cap, info->filter_fn, + &dma_spec->args[0]); +} + +static const struct cppi_glue_infos usb_infos = { + .isr = cppi41_irq, + .queues_rx = usb_queues_rx, + .queues_tx = usb_queues_tx, + .td_queue = { .submit = 31, .complete = 0 }, +}; + +static const struct of_device_id cppi41_dma_ids[] = { + { .compatible = "ti,am3359-cppi41", .data = &usb_infos}, + {}, +}; +MODULE_DEVICE_TABLE(of, cppi41_dma_ids); + +static const struct cppi_glue_infos *get_glue_info(struct device *dev) +{ + const struct of_device_id *of_id; + + of_id = of_match_node(cppi41_dma_ids, dev->of_node); + if (!of_id) + return NULL; + return of_id->data; +} + +#define CPPI41_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) + +static int cppi41_dma_probe(struct platform_device *pdev) +{ + struct cppi41_dd *cdd; + struct device *dev = &pdev->dev; + const struct cppi_glue_infos *glue_info; + int irq; + int ret; + + glue_info = get_glue_info(dev); + if (!glue_info) + return -EINVAL; + + cdd = devm_kzalloc(&pdev->dev, sizeof(*cdd), GFP_KERNEL); + if (!cdd) + return -ENOMEM; + + dma_cap_set(DMA_SLAVE, cdd->ddev.cap_mask); + cdd->ddev.device_alloc_chan_resources = cppi41_dma_alloc_chan_resources; + cdd->ddev.device_free_chan_resources = cppi41_dma_free_chan_resources; + cdd->ddev.device_tx_status = cppi41_dma_tx_status; + cdd->ddev.device_issue_pending = cppi41_dma_issue_pending; + cdd->ddev.device_prep_slave_sg = cppi41_dma_prep_slave_sg; + cdd->ddev.device_terminate_all = cppi41_stop_chan; + cdd->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + cdd->ddev.src_addr_widths = CPPI41_DMA_BUSWIDTHS; + cdd->ddev.dst_addr_widths = CPPI41_DMA_BUSWIDTHS; + cdd->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + cdd->ddev.dev = dev; + INIT_LIST_HEAD(&cdd->ddev.channels); + cpp41_dma_info.dma_cap = cdd->ddev.cap_mask; + + cdd->usbss_mem = of_iomap(dev->of_node, 0); + cdd->ctrl_mem = of_iomap(dev->of_node, 1); + cdd->sched_mem = of_iomap(dev->of_node, 2); + cdd->qmgr_mem = of_iomap(dev->of_node, 3); + + if (!cdd->usbss_mem || !cdd->ctrl_mem || !cdd->sched_mem || + !cdd->qmgr_mem) + return -ENXIO; + + pm_runtime_enable(dev); + ret = pm_runtime_get_sync(dev); + if (ret < 0) + goto err_get_sync; + + cdd->queues_rx = glue_info->queues_rx; + cdd->queues_tx = glue_info->queues_tx; + cdd->td_queue = glue_info->td_queue; + + ret = init_cppi41(dev, cdd); + if (ret) + goto err_init_cppi; + + ret = cppi41_add_chans(dev, cdd); + if (ret) + goto err_chans; + + irq = irq_of_parse_and_map(dev->of_node, 0); + if (!irq) { + ret = -EINVAL; + goto err_irq; + } + + cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER); + + ret = devm_request_irq(&pdev->dev, irq, glue_info->isr, IRQF_SHARED, + dev_name(dev), cdd); + if (ret) + goto err_irq; + cdd->irq = irq; + + ret = dma_async_device_register(&cdd->ddev); + if (ret) + goto err_dma_reg; + + ret = of_dma_controller_register(dev->of_node, + cppi41_dma_xlate, &cpp41_dma_info); + if (ret) + goto err_of; + + platform_set_drvdata(pdev, cdd); + return 0; +err_of: + dma_async_device_unregister(&cdd->ddev); +err_dma_reg: +err_irq: + cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR); + cleanup_chans(cdd); +err_chans: + deinit_cppi41(dev, cdd); +err_init_cppi: + pm_runtime_put(dev); +err_get_sync: + pm_runtime_disable(dev); + iounmap(cdd->usbss_mem); + iounmap(cdd->ctrl_mem); + iounmap(cdd->sched_mem); + iounmap(cdd->qmgr_mem); + return ret; +} + +static int cppi41_dma_remove(struct platform_device *pdev) +{ + struct cppi41_dd *cdd = platform_get_drvdata(pdev); + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&cdd->ddev); + + cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR); + devm_free_irq(&pdev->dev, cdd->irq, cdd); + cleanup_chans(cdd); + deinit_cppi41(&pdev->dev, cdd); + iounmap(cdd->usbss_mem); + iounmap(cdd->ctrl_mem); + iounmap(cdd->sched_mem); + iounmap(cdd->qmgr_mem); + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int cppi41_suspend(struct device *dev) +{ + struct cppi41_dd *cdd = dev_get_drvdata(dev); + + cdd->dma_tdfdq = cppi_readl(cdd->ctrl_mem + DMA_TDFDQ); + cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR); + disable_sched(cdd); + + return 0; +} + +static int cppi41_resume(struct device *dev) +{ + struct cppi41_dd *cdd = dev_get_drvdata(dev); + struct cppi41_channel *c; + int i; + + for (i = 0; i < DESCS_AREAS; i++) + cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i)); + + list_for_each_entry(c, &cdd->ddev.channels, chan.device_node) + if (!c->is_tx) + cppi_writel(c->q_num, c->gcr_reg + RXHPCRA0); + + init_sched(cdd); + + cppi_writel(cdd->dma_tdfdq, cdd->ctrl_mem + DMA_TDFDQ); + cppi_writel(cdd->scratch_phys, cdd->qmgr_mem + QMGR_LRAM0_BASE); + cppi_writel(QMGR_SCRATCH_SIZE, cdd->qmgr_mem + QMGR_LRAM_SIZE); + cppi_writel(0, cdd->qmgr_mem + QMGR_LRAM1_BASE); + + cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(cppi41_pm_ops, cppi41_suspend, cppi41_resume); + +static struct platform_driver cpp41_dma_driver = { + .probe = cppi41_dma_probe, + .remove = cppi41_dma_remove, + .driver = { + .name = "cppi41-dma-engine", + .pm = &cppi41_pm_ops, + .of_match_table = of_match_ptr(cppi41_dma_ids), + }, +}; + +module_platform_driver(cpp41_dma_driver); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); diff --git a/drivers/dma/dma-jz4740.c b/drivers/dma/dma-jz4740.c new file mode 100644 index 000000000..7638b24ce --- /dev/null +++ b/drivers/dma/dma-jz4740.c @@ -0,0 +1,599 @@ +/* + * Copyright (C) 2013, Lars-Peter Clausen <lars@metafoo.de> + * JZ4740 DMAC support + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/irq.h> +#include <linux/clk.h> + +#include <asm/mach-jz4740/dma.h> + +#include "virt-dma.h" + +#define JZ_DMA_NR_CHANS 6 + +#define JZ_REG_DMA_SRC_ADDR(x) (0x00 + (x) * 0x20) +#define JZ_REG_DMA_DST_ADDR(x) (0x04 + (x) * 0x20) +#define JZ_REG_DMA_TRANSFER_COUNT(x) (0x08 + (x) * 0x20) +#define JZ_REG_DMA_REQ_TYPE(x) (0x0C + (x) * 0x20) +#define JZ_REG_DMA_STATUS_CTRL(x) (0x10 + (x) * 0x20) +#define JZ_REG_DMA_CMD(x) (0x14 + (x) * 0x20) +#define JZ_REG_DMA_DESC_ADDR(x) (0x18 + (x) * 0x20) + +#define JZ_REG_DMA_CTRL 0x300 +#define JZ_REG_DMA_IRQ 0x304 +#define JZ_REG_DMA_DOORBELL 0x308 +#define JZ_REG_DMA_DOORBELL_SET 0x30C + +#define JZ_DMA_STATUS_CTRL_NO_DESC BIT(31) +#define JZ_DMA_STATUS_CTRL_DESC_INV BIT(6) +#define JZ_DMA_STATUS_CTRL_ADDR_ERR BIT(4) +#define JZ_DMA_STATUS_CTRL_TRANSFER_DONE BIT(3) +#define JZ_DMA_STATUS_CTRL_HALT BIT(2) +#define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE BIT(1) +#define JZ_DMA_STATUS_CTRL_ENABLE BIT(0) + +#define JZ_DMA_CMD_SRC_INC BIT(23) +#define JZ_DMA_CMD_DST_INC BIT(22) +#define JZ_DMA_CMD_RDIL_MASK (0xf << 16) +#define JZ_DMA_CMD_SRC_WIDTH_MASK (0x3 << 14) +#define JZ_DMA_CMD_DST_WIDTH_MASK (0x3 << 12) +#define JZ_DMA_CMD_INTERVAL_LENGTH_MASK (0x7 << 8) +#define JZ_DMA_CMD_BLOCK_MODE BIT(7) +#define JZ_DMA_CMD_DESC_VALID BIT(4) +#define JZ_DMA_CMD_DESC_VALID_MODE BIT(3) +#define JZ_DMA_CMD_VALID_IRQ_ENABLE BIT(2) +#define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE BIT(1) +#define JZ_DMA_CMD_LINK_ENABLE BIT(0) + +#define JZ_DMA_CMD_FLAGS_OFFSET 22 +#define JZ_DMA_CMD_RDIL_OFFSET 16 +#define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14 +#define JZ_DMA_CMD_DST_WIDTH_OFFSET 12 +#define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8 +#define JZ_DMA_CMD_MODE_OFFSET 7 + +#define JZ_DMA_CTRL_PRIORITY_MASK (0x3 << 8) +#define JZ_DMA_CTRL_HALT BIT(3) +#define JZ_DMA_CTRL_ADDRESS_ERROR BIT(2) +#define JZ_DMA_CTRL_ENABLE BIT(0) + +enum jz4740_dma_width { + JZ4740_DMA_WIDTH_32BIT = 0, + JZ4740_DMA_WIDTH_8BIT = 1, + JZ4740_DMA_WIDTH_16BIT = 2, +}; + +enum jz4740_dma_transfer_size { + JZ4740_DMA_TRANSFER_SIZE_4BYTE = 0, + JZ4740_DMA_TRANSFER_SIZE_1BYTE = 1, + JZ4740_DMA_TRANSFER_SIZE_2BYTE = 2, + JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3, + JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4, +}; + +enum jz4740_dma_flags { + JZ4740_DMA_SRC_AUTOINC = 0x2, + JZ4740_DMA_DST_AUTOINC = 0x1, +}; + +enum jz4740_dma_mode { + JZ4740_DMA_MODE_SINGLE = 0, + JZ4740_DMA_MODE_BLOCK = 1, +}; + +struct jz4740_dma_sg { + dma_addr_t addr; + unsigned int len; +}; + +struct jz4740_dma_desc { + struct virt_dma_desc vdesc; + + enum dma_transfer_direction direction; + bool cyclic; + + unsigned int num_sgs; + struct jz4740_dma_sg sg[]; +}; + +struct jz4740_dmaengine_chan { + struct virt_dma_chan vchan; + unsigned int id; + + dma_addr_t fifo_addr; + unsigned int transfer_shift; + + struct jz4740_dma_desc *desc; + unsigned int next_sg; +}; + +struct jz4740_dma_dev { + struct dma_device ddev; + void __iomem *base; + struct clk *clk; + + struct jz4740_dmaengine_chan chan[JZ_DMA_NR_CHANS]; +}; + +static struct jz4740_dma_dev *jz4740_dma_chan_get_dev( + struct jz4740_dmaengine_chan *chan) +{ + return container_of(chan->vchan.chan.device, struct jz4740_dma_dev, + ddev); +} + +static struct jz4740_dmaengine_chan *to_jz4740_dma_chan(struct dma_chan *c) +{ + return container_of(c, struct jz4740_dmaengine_chan, vchan.chan); +} + +static struct jz4740_dma_desc *to_jz4740_dma_desc(struct virt_dma_desc *vdesc) +{ + return container_of(vdesc, struct jz4740_dma_desc, vdesc); +} + +static inline uint32_t jz4740_dma_read(struct jz4740_dma_dev *dmadev, + unsigned int reg) +{ + return readl(dmadev->base + reg); +} + +static inline void jz4740_dma_write(struct jz4740_dma_dev *dmadev, + unsigned reg, uint32_t val) +{ + writel(val, dmadev->base + reg); +} + +static inline void jz4740_dma_write_mask(struct jz4740_dma_dev *dmadev, + unsigned int reg, uint32_t val, uint32_t mask) +{ + uint32_t tmp; + + tmp = jz4740_dma_read(dmadev, reg); + tmp &= ~mask; + tmp |= val; + jz4740_dma_write(dmadev, reg, tmp); +} + +static struct jz4740_dma_desc *jz4740_dma_alloc_desc(unsigned int num_sgs) +{ + return kzalloc(sizeof(struct jz4740_dma_desc) + + sizeof(struct jz4740_dma_sg) * num_sgs, GFP_ATOMIC); +} + +static enum jz4740_dma_width jz4740_dma_width(enum dma_slave_buswidth width) +{ + switch (width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + return JZ4740_DMA_WIDTH_8BIT; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + return JZ4740_DMA_WIDTH_16BIT; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + return JZ4740_DMA_WIDTH_32BIT; + default: + return JZ4740_DMA_WIDTH_32BIT; + } +} + +static enum jz4740_dma_transfer_size jz4740_dma_maxburst(u32 maxburst) +{ + if (maxburst <= 1) + return JZ4740_DMA_TRANSFER_SIZE_1BYTE; + else if (maxburst <= 3) + return JZ4740_DMA_TRANSFER_SIZE_2BYTE; + else if (maxburst <= 15) + return JZ4740_DMA_TRANSFER_SIZE_4BYTE; + else if (maxburst <= 31) + return JZ4740_DMA_TRANSFER_SIZE_16BYTE; + + return JZ4740_DMA_TRANSFER_SIZE_32BYTE; +} + +static int jz4740_dma_slave_config(struct dma_chan *c, + struct dma_slave_config *config) +{ + struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); + struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); + enum jz4740_dma_width src_width; + enum jz4740_dma_width dst_width; + enum jz4740_dma_transfer_size transfer_size; + enum jz4740_dma_flags flags; + uint32_t cmd; + + switch (config->direction) { + case DMA_MEM_TO_DEV: + flags = JZ4740_DMA_SRC_AUTOINC; + transfer_size = jz4740_dma_maxburst(config->dst_maxburst); + chan->fifo_addr = config->dst_addr; + break; + case DMA_DEV_TO_MEM: + flags = JZ4740_DMA_DST_AUTOINC; + transfer_size = jz4740_dma_maxburst(config->src_maxburst); + chan->fifo_addr = config->src_addr; + break; + default: + return -EINVAL; + } + + src_width = jz4740_dma_width(config->src_addr_width); + dst_width = jz4740_dma_width(config->dst_addr_width); + + switch (transfer_size) { + case JZ4740_DMA_TRANSFER_SIZE_2BYTE: + chan->transfer_shift = 1; + break; + case JZ4740_DMA_TRANSFER_SIZE_4BYTE: + chan->transfer_shift = 2; + break; + case JZ4740_DMA_TRANSFER_SIZE_16BYTE: + chan->transfer_shift = 4; + break; + case JZ4740_DMA_TRANSFER_SIZE_32BYTE: + chan->transfer_shift = 5; + break; + default: + chan->transfer_shift = 0; + break; + } + + cmd = flags << JZ_DMA_CMD_FLAGS_OFFSET; + cmd |= src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET; + cmd |= dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET; + cmd |= transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET; + cmd |= JZ4740_DMA_MODE_SINGLE << JZ_DMA_CMD_MODE_OFFSET; + cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE; + + jz4740_dma_write(dmadev, JZ_REG_DMA_CMD(chan->id), cmd); + jz4740_dma_write(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0); + jz4740_dma_write(dmadev, JZ_REG_DMA_REQ_TYPE(chan->id), + config->slave_id); + + return 0; +} + +static int jz4740_dma_terminate_all(struct dma_chan *c) +{ + struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); + struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&chan->vchan.lock, flags); + jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0, + JZ_DMA_STATUS_CTRL_ENABLE); + chan->desc = NULL; + vchan_get_all_descriptors(&chan->vchan, &head); + spin_unlock_irqrestore(&chan->vchan.lock, flags); + + vchan_dma_desc_free_list(&chan->vchan, &head); + + return 0; +} + +static int jz4740_dma_start_transfer(struct jz4740_dmaengine_chan *chan) +{ + struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); + dma_addr_t src_addr, dst_addr; + struct virt_dma_desc *vdesc; + struct jz4740_dma_sg *sg; + + jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), 0, + JZ_DMA_STATUS_CTRL_ENABLE); + + if (!chan->desc) { + vdesc = vchan_next_desc(&chan->vchan); + if (!vdesc) + return 0; + chan->desc = to_jz4740_dma_desc(vdesc); + chan->next_sg = 0; + } + + if (chan->next_sg == chan->desc->num_sgs) + chan->next_sg = 0; + + sg = &chan->desc->sg[chan->next_sg]; + + if (chan->desc->direction == DMA_MEM_TO_DEV) { + src_addr = sg->addr; + dst_addr = chan->fifo_addr; + } else { + src_addr = chan->fifo_addr; + dst_addr = sg->addr; + } + jz4740_dma_write(dmadev, JZ_REG_DMA_SRC_ADDR(chan->id), src_addr); + jz4740_dma_write(dmadev, JZ_REG_DMA_DST_ADDR(chan->id), dst_addr); + jz4740_dma_write(dmadev, JZ_REG_DMA_TRANSFER_COUNT(chan->id), + sg->len >> chan->transfer_shift); + + chan->next_sg++; + + jz4740_dma_write_mask(dmadev, JZ_REG_DMA_STATUS_CTRL(chan->id), + JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE, + JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC | + JZ_DMA_STATUS_CTRL_ENABLE); + + jz4740_dma_write_mask(dmadev, JZ_REG_DMA_CTRL, + JZ_DMA_CTRL_ENABLE, + JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE); + + return 0; +} + +static void jz4740_dma_chan_irq(struct jz4740_dmaengine_chan *chan) +{ + spin_lock(&chan->vchan.lock); + if (chan->desc) { + if (chan->desc->cyclic) { + vchan_cyclic_callback(&chan->desc->vdesc); + } else { + if (chan->next_sg == chan->desc->num_sgs) { + list_del(&chan->desc->vdesc.node); + vchan_cookie_complete(&chan->desc->vdesc); + chan->desc = NULL; + } + } + } + jz4740_dma_start_transfer(chan); + spin_unlock(&chan->vchan.lock); +} + +static irqreturn_t jz4740_dma_irq(int irq, void *devid) +{ + struct jz4740_dma_dev *dmadev = devid; + uint32_t irq_status; + unsigned int i; + + irq_status = readl(dmadev->base + JZ_REG_DMA_IRQ); + + for (i = 0; i < 6; ++i) { + if (irq_status & (1 << i)) { + jz4740_dma_write_mask(dmadev, + JZ_REG_DMA_STATUS_CTRL(i), 0, + JZ_DMA_STATUS_CTRL_ENABLE | + JZ_DMA_STATUS_CTRL_TRANSFER_DONE); + + jz4740_dma_chan_irq(&dmadev->chan[i]); + } + } + + return IRQ_HANDLED; +} + +static void jz4740_dma_issue_pending(struct dma_chan *c) +{ + struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); + unsigned long flags; + + spin_lock_irqsave(&chan->vchan.lock, flags); + if (vchan_issue_pending(&chan->vchan) && !chan->desc) + jz4740_dma_start_transfer(chan); + spin_unlock_irqrestore(&chan->vchan.lock, flags); +} + +static struct dma_async_tx_descriptor *jz4740_dma_prep_slave_sg( + struct dma_chan *c, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); + struct jz4740_dma_desc *desc; + struct scatterlist *sg; + unsigned int i; + + desc = jz4740_dma_alloc_desc(sg_len); + if (!desc) + return NULL; + + for_each_sg(sgl, sg, sg_len, i) { + desc->sg[i].addr = sg_dma_address(sg); + desc->sg[i].len = sg_dma_len(sg); + } + + desc->num_sgs = sg_len; + desc->direction = direction; + desc->cyclic = false; + + return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); +} + +static struct dma_async_tx_descriptor *jz4740_dma_prep_dma_cyclic( + struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); + struct jz4740_dma_desc *desc; + unsigned int num_periods, i; + + if (buf_len % period_len) + return NULL; + + num_periods = buf_len / period_len; + + desc = jz4740_dma_alloc_desc(num_periods); + if (!desc) + return NULL; + + for (i = 0; i < num_periods; i++) { + desc->sg[i].addr = buf_addr; + desc->sg[i].len = period_len; + buf_addr += period_len; + } + + desc->num_sgs = num_periods; + desc->direction = direction; + desc->cyclic = true; + + return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags); +} + +static size_t jz4740_dma_desc_residue(struct jz4740_dmaengine_chan *chan, + struct jz4740_dma_desc *desc, unsigned int next_sg) +{ + struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan); + unsigned int residue, count; + unsigned int i; + + residue = 0; + + for (i = next_sg; i < desc->num_sgs; i++) + residue += desc->sg[i].len; + + if (next_sg != 0) { + count = jz4740_dma_read(dmadev, + JZ_REG_DMA_TRANSFER_COUNT(chan->id)); + residue += count << chan->transfer_shift; + } + + return residue; +} + +static enum dma_status jz4740_dma_tx_status(struct dma_chan *c, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c); + struct virt_dma_desc *vdesc; + enum dma_status status; + unsigned long flags; + + status = dma_cookie_status(c, cookie, state); + if (status == DMA_COMPLETE || !state) + return status; + + spin_lock_irqsave(&chan->vchan.lock, flags); + vdesc = vchan_find_desc(&chan->vchan, cookie); + if (cookie == chan->desc->vdesc.tx.cookie) { + state->residue = jz4740_dma_desc_residue(chan, chan->desc, + chan->next_sg); + } else if (vdesc) { + state->residue = jz4740_dma_desc_residue(chan, + to_jz4740_dma_desc(vdesc), 0); + } else { + state->residue = 0; + } + spin_unlock_irqrestore(&chan->vchan.lock, flags); + + return status; +} + +static void jz4740_dma_free_chan_resources(struct dma_chan *c) +{ + vchan_free_chan_resources(to_virt_chan(c)); +} + +static void jz4740_dma_desc_free(struct virt_dma_desc *vdesc) +{ + kfree(container_of(vdesc, struct jz4740_dma_desc, vdesc)); +} + +#define JZ4740_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) + +static int jz4740_dma_probe(struct platform_device *pdev) +{ + struct jz4740_dmaengine_chan *chan; + struct jz4740_dma_dev *dmadev; + struct dma_device *dd; + unsigned int i; + struct resource *res; + int ret; + int irq; + + dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL); + if (!dmadev) + return -EINVAL; + + dd = &dmadev->ddev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dmadev->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(dmadev->base)) + return PTR_ERR(dmadev->base); + + dmadev->clk = clk_get(&pdev->dev, "dma"); + if (IS_ERR(dmadev->clk)) + return PTR_ERR(dmadev->clk); + + clk_prepare_enable(dmadev->clk); + + dma_cap_set(DMA_SLAVE, dd->cap_mask); + dma_cap_set(DMA_CYCLIC, dd->cap_mask); + dd->device_free_chan_resources = jz4740_dma_free_chan_resources; + dd->device_tx_status = jz4740_dma_tx_status; + dd->device_issue_pending = jz4740_dma_issue_pending; + dd->device_prep_slave_sg = jz4740_dma_prep_slave_sg; + dd->device_prep_dma_cyclic = jz4740_dma_prep_dma_cyclic; + dd->device_config = jz4740_dma_slave_config; + dd->device_terminate_all = jz4740_dma_terminate_all; + dd->src_addr_widths = JZ4740_DMA_BUSWIDTHS; + dd->dst_addr_widths = JZ4740_DMA_BUSWIDTHS; + dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + dd->dev = &pdev->dev; + INIT_LIST_HEAD(&dd->channels); + + for (i = 0; i < JZ_DMA_NR_CHANS; i++) { + chan = &dmadev->chan[i]; + chan->id = i; + chan->vchan.desc_free = jz4740_dma_desc_free; + vchan_init(&chan->vchan, dd); + } + + ret = dma_async_device_register(dd); + if (ret) + return ret; + + irq = platform_get_irq(pdev, 0); + ret = request_irq(irq, jz4740_dma_irq, 0, dev_name(&pdev->dev), dmadev); + if (ret) + goto err_unregister; + + platform_set_drvdata(pdev, dmadev); + + return 0; + +err_unregister: + dma_async_device_unregister(dd); + return ret; +} + +static int jz4740_dma_remove(struct platform_device *pdev) +{ + struct jz4740_dma_dev *dmadev = platform_get_drvdata(pdev); + int irq = platform_get_irq(pdev, 0); + + free_irq(irq, dmadev); + dma_async_device_unregister(&dmadev->ddev); + clk_disable_unprepare(dmadev->clk); + + return 0; +} + +static struct platform_driver jz4740_dma_driver = { + .probe = jz4740_dma_probe, + .remove = jz4740_dma_remove, + .driver = { + .name = "jz4740-dma", + }, +}; +module_platform_driver(jz4740_dma_driver); + +MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); +MODULE_DESCRIPTION("JZ4740 DMA driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c new file mode 100644 index 000000000..26d2f0e09 --- /dev/null +++ b/drivers/dma/dma-jz4780.c @@ -0,0 +1,877 @@ +/* + * Ingenic JZ4780 DMA controller + * + * Copyright (c) 2015 Imagination Technologies + * Author: Alex Smith <alex@alex-smith.me.uk> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/clk.h> +#include <linux/dmapool.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "dmaengine.h" +#include "virt-dma.h" + +#define JZ_DMA_NR_CHANNELS 32 + +/* Global registers. */ +#define JZ_DMA_REG_DMAC 0x1000 +#define JZ_DMA_REG_DIRQP 0x1004 +#define JZ_DMA_REG_DDR 0x1008 +#define JZ_DMA_REG_DDRS 0x100c +#define JZ_DMA_REG_DMACP 0x101c +#define JZ_DMA_REG_DSIRQP 0x1020 +#define JZ_DMA_REG_DSIRQM 0x1024 +#define JZ_DMA_REG_DCIRQP 0x1028 +#define JZ_DMA_REG_DCIRQM 0x102c + +/* Per-channel registers. */ +#define JZ_DMA_REG_CHAN(n) (n * 0x20) +#define JZ_DMA_REG_DSA(n) (0x00 + JZ_DMA_REG_CHAN(n)) +#define JZ_DMA_REG_DTA(n) (0x04 + JZ_DMA_REG_CHAN(n)) +#define JZ_DMA_REG_DTC(n) (0x08 + JZ_DMA_REG_CHAN(n)) +#define JZ_DMA_REG_DRT(n) (0x0c + JZ_DMA_REG_CHAN(n)) +#define JZ_DMA_REG_DCS(n) (0x10 + JZ_DMA_REG_CHAN(n)) +#define JZ_DMA_REG_DCM(n) (0x14 + JZ_DMA_REG_CHAN(n)) +#define JZ_DMA_REG_DDA(n) (0x18 + JZ_DMA_REG_CHAN(n)) +#define JZ_DMA_REG_DSD(n) (0x1c + JZ_DMA_REG_CHAN(n)) + +#define JZ_DMA_DMAC_DMAE BIT(0) +#define JZ_DMA_DMAC_AR BIT(2) +#define JZ_DMA_DMAC_HLT BIT(3) +#define JZ_DMA_DMAC_FMSC BIT(31) + +#define JZ_DMA_DRT_AUTO 0x8 + +#define JZ_DMA_DCS_CTE BIT(0) +#define JZ_DMA_DCS_HLT BIT(2) +#define JZ_DMA_DCS_TT BIT(3) +#define JZ_DMA_DCS_AR BIT(4) +#define JZ_DMA_DCS_DES8 BIT(30) + +#define JZ_DMA_DCM_LINK BIT(0) +#define JZ_DMA_DCM_TIE BIT(1) +#define JZ_DMA_DCM_STDE BIT(2) +#define JZ_DMA_DCM_TSZ_SHIFT 8 +#define JZ_DMA_DCM_TSZ_MASK (0x7 << JZ_DMA_DCM_TSZ_SHIFT) +#define JZ_DMA_DCM_DP_SHIFT 12 +#define JZ_DMA_DCM_SP_SHIFT 14 +#define JZ_DMA_DCM_DAI BIT(22) +#define JZ_DMA_DCM_SAI BIT(23) + +#define JZ_DMA_SIZE_4_BYTE 0x0 +#define JZ_DMA_SIZE_1_BYTE 0x1 +#define JZ_DMA_SIZE_2_BYTE 0x2 +#define JZ_DMA_SIZE_16_BYTE 0x3 +#define JZ_DMA_SIZE_32_BYTE 0x4 +#define JZ_DMA_SIZE_64_BYTE 0x5 +#define JZ_DMA_SIZE_128_BYTE 0x6 + +#define JZ_DMA_WIDTH_32_BIT 0x0 +#define JZ_DMA_WIDTH_8_BIT 0x1 +#define JZ_DMA_WIDTH_16_BIT 0x2 + +#define JZ_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) + +/** + * struct jz4780_dma_hwdesc - descriptor structure read by the DMA controller. + * @dcm: value for the DCM (channel command) register + * @dsa: source address + * @dta: target address + * @dtc: transfer count (number of blocks of the transfer size specified in DCM + * to transfer) in the low 24 bits, offset of the next descriptor from the + * descriptor base address in the upper 8 bits. + * @sd: target/source stride difference (in stride transfer mode). + * @drt: request type + */ +struct jz4780_dma_hwdesc { + uint32_t dcm; + uint32_t dsa; + uint32_t dta; + uint32_t dtc; + uint32_t sd; + uint32_t drt; + uint32_t reserved[2]; +}; + +/* Size of allocations for hardware descriptor blocks. */ +#define JZ_DMA_DESC_BLOCK_SIZE PAGE_SIZE +#define JZ_DMA_MAX_DESC \ + (JZ_DMA_DESC_BLOCK_SIZE / sizeof(struct jz4780_dma_hwdesc)) + +struct jz4780_dma_desc { + struct virt_dma_desc vdesc; + + struct jz4780_dma_hwdesc *desc; + dma_addr_t desc_phys; + unsigned int count; + enum dma_transaction_type type; + uint32_t status; +}; + +struct jz4780_dma_chan { + struct virt_dma_chan vchan; + unsigned int id; + struct dma_pool *desc_pool; + + uint32_t transfer_type; + uint32_t transfer_shift; + struct dma_slave_config config; + + struct jz4780_dma_desc *desc; + unsigned int curr_hwdesc; +}; + +struct jz4780_dma_dev { + struct dma_device dma_device; + void __iomem *base; + struct clk *clk; + unsigned int irq; + + uint32_t chan_reserved; + struct jz4780_dma_chan chan[JZ_DMA_NR_CHANNELS]; +}; + +struct jz4780_dma_data { + uint32_t transfer_type; + int channel; +}; + +static inline struct jz4780_dma_chan *to_jz4780_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct jz4780_dma_chan, vchan.chan); +} + +static inline struct jz4780_dma_desc *to_jz4780_dma_desc( + struct virt_dma_desc *vdesc) +{ + return container_of(vdesc, struct jz4780_dma_desc, vdesc); +} + +static inline struct jz4780_dma_dev *jz4780_dma_chan_parent( + struct jz4780_dma_chan *jzchan) +{ + return container_of(jzchan->vchan.chan.device, struct jz4780_dma_dev, + dma_device); +} + +static inline uint32_t jz4780_dma_readl(struct jz4780_dma_dev *jzdma, + unsigned int reg) +{ + return readl(jzdma->base + reg); +} + +static inline void jz4780_dma_writel(struct jz4780_dma_dev *jzdma, + unsigned int reg, uint32_t val) +{ + writel(val, jzdma->base + reg); +} + +static struct jz4780_dma_desc *jz4780_dma_desc_alloc( + struct jz4780_dma_chan *jzchan, unsigned int count, + enum dma_transaction_type type) +{ + struct jz4780_dma_desc *desc; + + if (count > JZ_DMA_MAX_DESC) + return NULL; + + desc = kzalloc(sizeof(*desc), GFP_NOWAIT); + if (!desc) + return NULL; + + desc->desc = dma_pool_alloc(jzchan->desc_pool, GFP_NOWAIT, + &desc->desc_phys); + if (!desc->desc) { + kfree(desc); + return NULL; + } + + desc->count = count; + desc->type = type; + return desc; +} + +static void jz4780_dma_desc_free(struct virt_dma_desc *vdesc) +{ + struct jz4780_dma_desc *desc = to_jz4780_dma_desc(vdesc); + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(vdesc->tx.chan); + + dma_pool_free(jzchan->desc_pool, desc->desc, desc->desc_phys); + kfree(desc); +} + +static uint32_t jz4780_dma_transfer_size(unsigned long val, int *ord) +{ + *ord = ffs(val) - 1; + + switch (*ord) { + case 0: + return JZ_DMA_SIZE_1_BYTE; + case 1: + return JZ_DMA_SIZE_2_BYTE; + case 2: + return JZ_DMA_SIZE_4_BYTE; + case 4: + return JZ_DMA_SIZE_16_BYTE; + case 5: + return JZ_DMA_SIZE_32_BYTE; + case 6: + return JZ_DMA_SIZE_64_BYTE; + case 7: + return JZ_DMA_SIZE_128_BYTE; + default: + return -EINVAL; + } +} + +static uint32_t jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan, + struct jz4780_dma_hwdesc *desc, dma_addr_t addr, size_t len, + enum dma_transfer_direction direction) +{ + struct dma_slave_config *config = &jzchan->config; + uint32_t width, maxburst, tsz; + int ord; + + if (direction == DMA_MEM_TO_DEV) { + desc->dcm = JZ_DMA_DCM_SAI; + desc->dsa = addr; + desc->dta = config->dst_addr; + desc->drt = jzchan->transfer_type; + + width = config->dst_addr_width; + maxburst = config->dst_maxburst; + } else { + desc->dcm = JZ_DMA_DCM_DAI; + desc->dsa = config->src_addr; + desc->dta = addr; + desc->drt = jzchan->transfer_type; + + width = config->src_addr_width; + maxburst = config->src_maxburst; + } + + /* + * This calculates the maximum transfer size that can be used with the + * given address, length, width and maximum burst size. The address + * must be aligned to the transfer size, the total length must be + * divisible by the transfer size, and we must not use more than the + * maximum burst specified by the user. + */ + tsz = jz4780_dma_transfer_size(addr | len | (width * maxburst), &ord); + jzchan->transfer_shift = ord; + + switch (width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + case DMA_SLAVE_BUSWIDTH_2_BYTES: + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + width = JZ_DMA_WIDTH_32_BIT; + break; + default: + return -EINVAL; + } + + desc->dcm |= tsz << JZ_DMA_DCM_TSZ_SHIFT; + desc->dcm |= width << JZ_DMA_DCM_SP_SHIFT; + desc->dcm |= width << JZ_DMA_DCM_DP_SHIFT; + + desc->dtc = len >> ord; +} + +static struct dma_async_tx_descriptor *jz4780_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + struct jz4780_dma_desc *desc; + unsigned int i; + int err; + + desc = jz4780_dma_desc_alloc(jzchan, sg_len, DMA_SLAVE); + if (!desc) + return NULL; + + for (i = 0; i < sg_len; i++) { + err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], + sg_dma_address(&sgl[i]), + sg_dma_len(&sgl[i]), + direction); + if (err < 0) + return ERR_PTR(err); + + + desc->desc[i].dcm |= JZ_DMA_DCM_TIE; + + if (i != (sg_len - 1)) { + /* Automatically proceeed to the next descriptor. */ + desc->desc[i].dcm |= JZ_DMA_DCM_LINK; + + /* + * The upper 8 bits of the DTC field in the descriptor + * must be set to (offset from descriptor base of next + * descriptor >> 4). + */ + desc->desc[i].dtc |= + (((i + 1) * sizeof(*desc->desc)) >> 4) << 24; + } + } + + return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags); +} + +static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + struct jz4780_dma_desc *desc; + unsigned int periods, i; + int err; + + if (buf_len % period_len) + return NULL; + + periods = buf_len / period_len; + + desc = jz4780_dma_desc_alloc(jzchan, periods, DMA_CYCLIC); + if (!desc) + return NULL; + + for (i = 0; i < periods; i++) { + err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], buf_addr, + period_len, direction); + if (err < 0) + return ERR_PTR(err); + + buf_addr += period_len; + + /* + * Set the link bit to indicate that the controller should + * automatically proceed to the next descriptor. In + * jz4780_dma_begin(), this will be cleared if we need to issue + * an interrupt after each period. + */ + desc->desc[i].dcm |= JZ_DMA_DCM_TIE | JZ_DMA_DCM_LINK; + + /* + * The upper 8 bits of the DTC field in the descriptor must be + * set to (offset from descriptor base of next descriptor >> 4). + * If this is the last descriptor, link it back to the first, + * i.e. leave offset set to 0, otherwise point to the next one. + */ + if (i != (periods - 1)) { + desc->desc[i].dtc |= + (((i + 1) * sizeof(*desc->desc)) >> 4) << 24; + } + } + + return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags); +} + +struct dma_async_tx_descriptor *jz4780_dma_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + struct jz4780_dma_desc *desc; + uint32_t tsz; + int ord; + + desc = jz4780_dma_desc_alloc(jzchan, 1, DMA_MEMCPY); + if (!desc) + return NULL; + + tsz = jz4780_dma_transfer_size(dest | src | len, &ord); + if (tsz < 0) + return ERR_PTR(tsz); + + desc->desc[0].dsa = src; + desc->desc[0].dta = dest; + desc->desc[0].drt = JZ_DMA_DRT_AUTO; + desc->desc[0].dcm = JZ_DMA_DCM_TIE | JZ_DMA_DCM_SAI | JZ_DMA_DCM_DAI | + tsz << JZ_DMA_DCM_TSZ_SHIFT | + JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_SP_SHIFT | + JZ_DMA_WIDTH_32_BIT << JZ_DMA_DCM_DP_SHIFT; + desc->desc[0].dtc = len >> ord; + + return vchan_tx_prep(&jzchan->vchan, &desc->vdesc, flags); +} + +static void jz4780_dma_begin(struct jz4780_dma_chan *jzchan) +{ + struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan); + struct virt_dma_desc *vdesc; + unsigned int i; + dma_addr_t desc_phys; + + if (!jzchan->desc) { + vdesc = vchan_next_desc(&jzchan->vchan); + if (!vdesc) + return; + + list_del(&vdesc->node); + + jzchan->desc = to_jz4780_dma_desc(vdesc); + jzchan->curr_hwdesc = 0; + + if (jzchan->desc->type == DMA_CYCLIC && vdesc->tx.callback) { + /* + * The DMA controller doesn't support triggering an + * interrupt after processing each descriptor, only + * after processing an entire terminated list of + * descriptors. For a cyclic DMA setup the list of + * descriptors is not terminated so we can never get an + * interrupt. + * + * If the user requested a callback for a cyclic DMA + * setup then we workaround this hardware limitation + * here by degrading to a set of unlinked descriptors + * which we will submit in sequence in response to the + * completion of processing the previous descriptor. + */ + for (i = 0; i < jzchan->desc->count; i++) + jzchan->desc->desc[i].dcm &= ~JZ_DMA_DCM_LINK; + } + } else { + /* + * There is an existing transfer, therefore this must be one + * for which we unlinked the descriptors above. Advance to the + * next one in the list. + */ + jzchan->curr_hwdesc = + (jzchan->curr_hwdesc + 1) % jzchan->desc->count; + } + + /* Use 8-word descriptors. */ + jz4780_dma_writel(jzdma, JZ_DMA_REG_DCS(jzchan->id), JZ_DMA_DCS_DES8); + + /* Write descriptor address and initiate descriptor fetch. */ + desc_phys = jzchan->desc->desc_phys + + (jzchan->curr_hwdesc * sizeof(*jzchan->desc->desc)); + jz4780_dma_writel(jzdma, JZ_DMA_REG_DDA(jzchan->id), desc_phys); + jz4780_dma_writel(jzdma, JZ_DMA_REG_DDRS, BIT(jzchan->id)); + + /* Enable the channel. */ + jz4780_dma_writel(jzdma, JZ_DMA_REG_DCS(jzchan->id), + JZ_DMA_DCS_DES8 | JZ_DMA_DCS_CTE); +} + +static void jz4780_dma_issue_pending(struct dma_chan *chan) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&jzchan->vchan.lock, flags); + + if (vchan_issue_pending(&jzchan->vchan) && !jzchan->desc) + jz4780_dma_begin(jzchan); + + spin_unlock_irqrestore(&jzchan->vchan.lock, flags); +} + +static int jz4780_dma_terminate_all(struct jz4780_dma_chan *jzchan) +{ + struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&jzchan->vchan.lock, flags); + + /* Clear the DMA status and stop the transfer. */ + jz4780_dma_writel(jzdma, JZ_DMA_REG_DCS(jzchan->id), 0); + if (jzchan->desc) { + jz4780_dma_desc_free(&jzchan->desc->vdesc); + jzchan->desc = NULL; + } + + vchan_get_all_descriptors(&jzchan->vchan, &head); + + spin_unlock_irqrestore(&jzchan->vchan.lock, flags); + + vchan_dma_desc_free_list(&jzchan->vchan, &head); + return 0; +} + +static int jz4780_dma_slave_config(struct jz4780_dma_chan *jzchan, + const struct dma_slave_config *config) +{ + if ((config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) + || (config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)) + return -EINVAL; + + /* Copy the reset of the slave configuration, it is used later. */ + memcpy(&jzchan->config, config, sizeof(jzchan->config)); + + return 0; +} + +static size_t jz4780_dma_desc_residue(struct jz4780_dma_chan *jzchan, + struct jz4780_dma_desc *desc, unsigned int next_sg) +{ + struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan); + unsigned int residue, count; + unsigned int i; + + residue = 0; + + for (i = next_sg; i < desc->count; i++) + residue += desc->desc[i].dtc << jzchan->transfer_shift; + + if (next_sg != 0) { + count = jz4780_dma_readl(jzdma, + JZ_DMA_REG_DTC(jzchan->id)); + residue += count << jzchan->transfer_shift; + } + + return residue; +} + +static enum dma_status jz4780_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + struct virt_dma_desc *vdesc; + enum dma_status status; + unsigned long flags; + + status = dma_cookie_status(chan, cookie, txstate); + if ((status == DMA_COMPLETE) || (txstate == NULL)) + return status; + + spin_lock_irqsave(&jzchan->vchan.lock, flags); + + vdesc = vchan_find_desc(&jzchan->vchan, cookie); + if (vdesc) { + /* On the issued list, so hasn't been processed yet */ + txstate->residue = jz4780_dma_desc_residue(jzchan, + to_jz4780_dma_desc(vdesc), 0); + } else if (cookie == jzchan->desc->vdesc.tx.cookie) { + txstate->residue = jz4780_dma_desc_residue(jzchan, jzchan->desc, + (jzchan->curr_hwdesc + 1) % jzchan->desc->count); + } else + txstate->residue = 0; + + if (vdesc && jzchan->desc && vdesc == &jzchan->desc->vdesc + && jzchan->desc->status & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT)) + status = DMA_ERROR; + + spin_unlock_irqrestore(&jzchan->vchan.lock, flags); + return status; +} + +static void jz4780_dma_chan_irq(struct jz4780_dma_dev *jzdma, + struct jz4780_dma_chan *jzchan) +{ + uint32_t dcs; + + spin_lock(&jzchan->vchan.lock); + + dcs = jz4780_dma_readl(jzdma, JZ_DMA_REG_DCS(jzchan->id)); + jz4780_dma_writel(jzdma, JZ_DMA_REG_DCS(jzchan->id), 0); + + if (dcs & JZ_DMA_DCS_AR) { + dev_warn(&jzchan->vchan.chan.dev->device, + "address error (DCS=0x%x)\n", dcs); + } + + if (dcs & JZ_DMA_DCS_HLT) { + dev_warn(&jzchan->vchan.chan.dev->device, + "channel halt (DCS=0x%x)\n", dcs); + } + + if (jzchan->desc) { + jzchan->desc->status = dcs; + + if ((dcs & (JZ_DMA_DCS_AR | JZ_DMA_DCS_HLT)) == 0) { + if (jzchan->desc->type == DMA_CYCLIC) { + vchan_cyclic_callback(&jzchan->desc->vdesc); + } else { + vchan_cookie_complete(&jzchan->desc->vdesc); + jzchan->desc = NULL; + } + + jz4780_dma_begin(jzchan); + } + } else { + dev_err(&jzchan->vchan.chan.dev->device, + "channel IRQ with no active transfer\n"); + } + + spin_unlock(&jzchan->vchan.lock); +} + +static irqreturn_t jz4780_dma_irq_handler(int irq, void *data) +{ + struct jz4780_dma_dev *jzdma = data; + uint32_t pending, dmac; + int i; + + pending = jz4780_dma_readl(jzdma, JZ_DMA_REG_DIRQP); + + for (i = 0; i < JZ_DMA_NR_CHANNELS; i++) { + if (!(pending & (1<<i))) + continue; + + jz4780_dma_chan_irq(jzdma, &jzdma->chan[i]); + } + + /* Clear halt and address error status of all channels. */ + dmac = jz4780_dma_readl(jzdma, JZ_DMA_REG_DMAC); + dmac &= ~(JZ_DMA_DMAC_HLT | JZ_DMA_DMAC_AR); + jz4780_dma_writel(jzdma, JZ_DMA_REG_DMAC, dmac); + + /* Clear interrupt pending status. */ + jz4780_dma_writel(jzdma, JZ_DMA_REG_DIRQP, 0); + + return IRQ_HANDLED; +} + +static int jz4780_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + + jzchan->desc_pool = dma_pool_create(dev_name(&chan->dev->device), + chan->device->dev, + JZ_DMA_DESC_BLOCK_SIZE, + PAGE_SIZE, 0); + if (!jzchan->desc_pool) { + dev_err(&chan->dev->device, + "failed to allocate descriptor pool\n"); + return -ENOMEM; + } + + return 0; +} + +static void jz4780_dma_free_chan_resources(struct dma_chan *chan) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + + vchan_free_chan_resources(&jzchan->vchan); + dma_pool_destroy(jzchan->desc_pool); + jzchan->desc_pool = NULL; +} + +static bool jz4780_dma_filter_fn(struct dma_chan *chan, void *param) +{ + struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan); + struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan); + struct jz4780_dma_data *data = param; + + if (data->channel > -1) { + if (data->channel != jzchan->id) + return false; + } else if (jzdma->chan_reserved & BIT(jzchan->id)) { + return false; + } + + jzchan->transfer_type = data->transfer_type; + + return true; +} + +static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct jz4780_dma_dev *jzdma = ofdma->of_dma_data; + dma_cap_mask_t mask = jzdma->dma_device.cap_mask; + struct jz4780_dma_data data; + + if (dma_spec->args_count != 2) + return NULL; + + data.transfer_type = dma_spec->args[0]; + data.channel = dma_spec->args[1]; + + if (data.channel > -1) { + if (data.channel >= JZ_DMA_NR_CHANNELS) { + dev_err(jzdma->dma_device.dev, + "device requested non-existent channel %u\n", + data.channel); + return NULL; + } + + /* Can only select a channel marked as reserved. */ + if (!(jzdma->chan_reserved & BIT(data.channel))) { + dev_err(jzdma->dma_device.dev, + "device requested unreserved channel %u\n", + data.channel); + return NULL; + } + } + + return dma_request_channel(mask, jz4780_dma_filter_fn, &data); +} + +static int jz4780_dma_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct jz4780_dma_dev *jzdma; + struct jz4780_dma_chan *jzchan; + struct dma_device *dd; + struct resource *res; + int i, ret; + + jzdma = devm_kzalloc(dev, sizeof(*jzdma), GFP_KERNEL); + if (!jzdma) + return -ENOMEM; + + platform_set_drvdata(pdev, jzdma); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "failed to get I/O memory\n"); + return -EINVAL; + } + + jzdma->base = devm_ioremap_resource(dev, res); + if (IS_ERR(jzdma->base)) + return PTR_ERR(jzdma->base); + + jzdma->irq = platform_get_irq(pdev, 0); + if (jzdma->irq < 0) { + dev_err(dev, "failed to get IRQ: %d\n", ret); + return jzdma->irq; + } + + ret = devm_request_irq(dev, jzdma->irq, jz4780_dma_irq_handler, 0, + dev_name(dev), jzdma); + if (ret) { + dev_err(dev, "failed to request IRQ %u!\n", jzdma->irq); + return -EINVAL; + } + + jzdma->clk = devm_clk_get(dev, NULL); + if (IS_ERR(jzdma->clk)) { + dev_err(dev, "failed to get clock\n"); + return PTR_ERR(jzdma->clk); + } + + clk_prepare_enable(jzdma->clk); + + /* Property is optional, if it doesn't exist the value will remain 0. */ + of_property_read_u32_index(dev->of_node, "ingenic,reserved-channels", + 0, &jzdma->chan_reserved); + + dd = &jzdma->dma_device; + + dma_cap_set(DMA_MEMCPY, dd->cap_mask); + dma_cap_set(DMA_SLAVE, dd->cap_mask); + dma_cap_set(DMA_CYCLIC, dd->cap_mask); + + dd->dev = dev; + dd->copy_align = 2; /* 2^2 = 4 byte alignment */ + dd->device_alloc_chan_resources = jz4780_dma_alloc_chan_resources; + dd->device_free_chan_resources = jz4780_dma_free_chan_resources; + dd->device_prep_slave_sg = jz4780_dma_prep_slave_sg; + dd->device_prep_dma_cyclic = jz4780_dma_prep_dma_cyclic; + dd->device_prep_dma_memcpy = jz4780_dma_prep_dma_memcpy; + dd->device_config = jz4780_dma_slave_config; + dd->device_terminate_all = jz4780_dma_terminate_all; + dd->device_tx_status = jz4780_dma_tx_status; + dd->device_issue_pending = jz4780_dma_issue_pending; + dd->src_addr_widths = JZ_DMA_BUSWIDTHS; + dd->dst_addr_widths = JZ_DMA_BUSWIDTHS; + dd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + dd->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + + /* + * Enable DMA controller, mark all channels as not programmable. + * Also set the FMSC bit - it increases MSC performance, so it makes + * little sense not to enable it. + */ + jz4780_dma_writel(jzdma, JZ_DMA_REG_DMAC, + JZ_DMA_DMAC_DMAE | JZ_DMA_DMAC_FMSC); + jz4780_dma_writel(jzdma, JZ_DMA_REG_DMACP, 0); + + INIT_LIST_HEAD(&dd->channels); + + for (i = 0; i < JZ_DMA_NR_CHANNELS; i++) { + jzchan = &jzdma->chan[i]; + jzchan->id = i; + + vchan_init(&jzchan->vchan, dd); + jzchan->vchan.desc_free = jz4780_dma_desc_free; + } + + ret = dma_async_device_register(dd); + if (ret) { + dev_err(dev, "failed to register device\n"); + goto err_disable_clk; + } + + /* Register with OF DMA helpers. */ + ret = of_dma_controller_register(dev->of_node, jz4780_of_dma_xlate, + jzdma); + if (ret) { + dev_err(dev, "failed to register OF DMA controller\n"); + goto err_unregister_dev; + } + + dev_info(dev, "JZ4780 DMA controller initialised\n"); + return 0; + +err_unregister_dev: + dma_async_device_unregister(dd); + +err_disable_clk: + clk_disable_unprepare(jzdma->clk); + return ret; +} + +static int jz4780_dma_remove(struct platform_device *pdev) +{ + struct jz4780_dma_dev *jzdma = platform_get_drvdata(pdev); + + of_dma_controller_free(pdev->dev.of_node); + devm_free_irq(&pdev->dev, jzdma->irq, jzdma); + dma_async_device_unregister(&jzdma->dma_device); + return 0; +} + +static const struct of_device_id jz4780_dma_dt_match[] = { + { .compatible = "ingenic,jz4780-dma", .data = NULL }, + {}, +}; +MODULE_DEVICE_TABLE(of, jz4780_dma_dt_match); + +static struct platform_driver jz4780_dma_driver = { + .probe = jz4780_dma_probe, + .remove = jz4780_dma_remove, + .driver = { + .name = "jz4780-dma", + .of_match_table = of_match_ptr(jz4780_dma_dt_match), + }, +}; + +static int __init jz4780_dma_init(void) +{ + return platform_driver_register(&jz4780_dma_driver); +} +subsys_initcall(jz4780_dma_init); + +static void __exit jz4780_dma_exit(void) +{ + platform_driver_unregister(&jz4780_dma_driver); +} +module_exit(jz4780_dma_exit); + +MODULE_AUTHOR("Alex Smith <alex@alex-smith.me.uk>"); +MODULE_DESCRIPTION("Ingenic JZ4780 DMA controller driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c new file mode 100644 index 000000000..3ddfd1f6c --- /dev/null +++ b/drivers/dma/dmaengine.c @@ -0,0 +1,1191 @@ +/* + * Copyright(c) 2004 - 2006 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ + +/* + * This code implements the DMA subsystem. It provides a HW-neutral interface + * for other kernel code to use asynchronous memory copy capabilities, + * if present, and allows different HW DMA drivers to register as providing + * this capability. + * + * Due to the fact we are accelerating what is already a relatively fast + * operation, the code goes to great lengths to avoid additional overhead, + * such as locking. + * + * LOCKING: + * + * The subsystem keeps a global list of dma_device structs it is protected by a + * mutex, dma_list_mutex. + * + * A subsystem can get access to a channel by calling dmaengine_get() followed + * by dma_find_channel(), or if it has need for an exclusive channel it can call + * dma_request_channel(). Once a channel is allocated a reference is taken + * against its corresponding driver to disable removal. + * + * Each device has a channels list, which runs unlocked but is never modified + * once the device is registered, it's just setup by the driver. + * + * See Documentation/dmaengine.txt for more details + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/device.h> +#include <linux/dmaengine.h> +#include <linux/hardirq.h> +#include <linux/spinlock.h> +#include <linux/percpu.h> +#include <linux/rcupdate.h> +#include <linux/mutex.h> +#include <linux/jiffies.h> +#include <linux/rculist.h> +#include <linux/idr.h> +#include <linux/slab.h> +#include <linux/acpi.h> +#include <linux/acpi_dma.h> +#include <linux/of_dma.h> +#include <linux/mempool.h> + +static DEFINE_MUTEX(dma_list_mutex); +static DEFINE_IDR(dma_idr); +static LIST_HEAD(dma_device_list); +static long dmaengine_ref_count; + +/* --- sysfs implementation --- */ + +/** + * dev_to_dma_chan - convert a device pointer to the its sysfs container object + * @dev - device node + * + * Must be called under dma_list_mutex + */ +static struct dma_chan *dev_to_dma_chan(struct device *dev) +{ + struct dma_chan_dev *chan_dev; + + chan_dev = container_of(dev, typeof(*chan_dev), device); + return chan_dev->chan; +} + +static ssize_t memcpy_count_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dma_chan *chan; + unsigned long count = 0; + int i; + int err; + + mutex_lock(&dma_list_mutex); + chan = dev_to_dma_chan(dev); + if (chan) { + for_each_possible_cpu(i) + count += per_cpu_ptr(chan->local, i)->memcpy_count; + err = sprintf(buf, "%lu\n", count); + } else + err = -ENODEV; + mutex_unlock(&dma_list_mutex); + + return err; +} +static DEVICE_ATTR_RO(memcpy_count); + +static ssize_t bytes_transferred_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dma_chan *chan; + unsigned long count = 0; + int i; + int err; + + mutex_lock(&dma_list_mutex); + chan = dev_to_dma_chan(dev); + if (chan) { + for_each_possible_cpu(i) + count += per_cpu_ptr(chan->local, i)->bytes_transferred; + err = sprintf(buf, "%lu\n", count); + } else + err = -ENODEV; + mutex_unlock(&dma_list_mutex); + + return err; +} +static DEVICE_ATTR_RO(bytes_transferred); + +static ssize_t in_use_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct dma_chan *chan; + int err; + + mutex_lock(&dma_list_mutex); + chan = dev_to_dma_chan(dev); + if (chan) + err = sprintf(buf, "%d\n", chan->client_count); + else + err = -ENODEV; + mutex_unlock(&dma_list_mutex); + + return err; +} +static DEVICE_ATTR_RO(in_use); + +static struct attribute *dma_dev_attrs[] = { + &dev_attr_memcpy_count.attr, + &dev_attr_bytes_transferred.attr, + &dev_attr_in_use.attr, + NULL, +}; +ATTRIBUTE_GROUPS(dma_dev); + +static void chan_dev_release(struct device *dev) +{ + struct dma_chan_dev *chan_dev; + + chan_dev = container_of(dev, typeof(*chan_dev), device); + if (atomic_dec_and_test(chan_dev->idr_ref)) { + mutex_lock(&dma_list_mutex); + idr_remove(&dma_idr, chan_dev->dev_id); + mutex_unlock(&dma_list_mutex); + kfree(chan_dev->idr_ref); + } + kfree(chan_dev); +} + +static struct class dma_devclass = { + .name = "dma", + .dev_groups = dma_dev_groups, + .dev_release = chan_dev_release, +}; + +/* --- client and device registration --- */ + +#define dma_device_satisfies_mask(device, mask) \ + __dma_device_satisfies_mask((device), &(mask)) +static int +__dma_device_satisfies_mask(struct dma_device *device, + const dma_cap_mask_t *want) +{ + dma_cap_mask_t has; + + bitmap_and(has.bits, want->bits, device->cap_mask.bits, + DMA_TX_TYPE_END); + return bitmap_equal(want->bits, has.bits, DMA_TX_TYPE_END); +} + +static struct module *dma_chan_to_owner(struct dma_chan *chan) +{ + return chan->device->dev->driver->owner; +} + +/** + * balance_ref_count - catch up the channel reference count + * @chan - channel to balance ->client_count versus dmaengine_ref_count + * + * balance_ref_count must be called under dma_list_mutex + */ +static void balance_ref_count(struct dma_chan *chan) +{ + struct module *owner = dma_chan_to_owner(chan); + + while (chan->client_count < dmaengine_ref_count) { + __module_get(owner); + chan->client_count++; + } +} + +/** + * dma_chan_get - try to grab a dma channel's parent driver module + * @chan - channel to grab + * + * Must be called under dma_list_mutex + */ +static int dma_chan_get(struct dma_chan *chan) +{ + struct module *owner = dma_chan_to_owner(chan); + int ret; + + /* The channel is already in use, update client count */ + if (chan->client_count) { + __module_get(owner); + goto out; + } + + if (!try_module_get(owner)) + return -ENODEV; + + /* allocate upon first client reference */ + if (chan->device->device_alloc_chan_resources) { + ret = chan->device->device_alloc_chan_resources(chan); + if (ret < 0) + goto err_out; + } + + if (!dma_has_cap(DMA_PRIVATE, chan->device->cap_mask)) + balance_ref_count(chan); + +out: + chan->client_count++; + return 0; + +err_out: + module_put(owner); + return ret; +} + +/** + * dma_chan_put - drop a reference to a dma channel's parent driver module + * @chan - channel to release + * + * Must be called under dma_list_mutex + */ +static void dma_chan_put(struct dma_chan *chan) +{ + /* This channel is not in use, bail out */ + if (!chan->client_count) + return; + + chan->client_count--; + module_put(dma_chan_to_owner(chan)); + + /* This channel is not in use anymore, free it */ + if (!chan->client_count && chan->device->device_free_chan_resources) + chan->device->device_free_chan_resources(chan); +} + +enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie) +{ + enum dma_status status; + unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); + + dma_async_issue_pending(chan); + do { + status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); + if (time_after_eq(jiffies, dma_sync_wait_timeout)) { + pr_err("%s: timeout!\n", __func__); + return DMA_ERROR; + } + if (status != DMA_IN_PROGRESS) + break; + cpu_relax(); + } while (1); + + return status; +} +EXPORT_SYMBOL(dma_sync_wait); + +/** + * dma_cap_mask_all - enable iteration over all operation types + */ +static dma_cap_mask_t dma_cap_mask_all; + +/** + * dma_chan_tbl_ent - tracks channel allocations per core/operation + * @chan - associated channel for this entry + */ +struct dma_chan_tbl_ent { + struct dma_chan *chan; +}; + +/** + * channel_table - percpu lookup table for memory-to-memory offload providers + */ +static struct dma_chan_tbl_ent __percpu *channel_table[DMA_TX_TYPE_END]; + +static int __init dma_channel_table_init(void) +{ + enum dma_transaction_type cap; + int err = 0; + + bitmap_fill(dma_cap_mask_all.bits, DMA_TX_TYPE_END); + + /* 'interrupt', 'private', and 'slave' are channel capabilities, + * but are not associated with an operation so they do not need + * an entry in the channel_table + */ + clear_bit(DMA_INTERRUPT, dma_cap_mask_all.bits); + clear_bit(DMA_PRIVATE, dma_cap_mask_all.bits); + clear_bit(DMA_SLAVE, dma_cap_mask_all.bits); + + for_each_dma_cap_mask(cap, dma_cap_mask_all) { + channel_table[cap] = alloc_percpu(struct dma_chan_tbl_ent); + if (!channel_table[cap]) { + err = -ENOMEM; + break; + } + } + + if (err) { + pr_err("initialization failure\n"); + for_each_dma_cap_mask(cap, dma_cap_mask_all) + free_percpu(channel_table[cap]); + } + + return err; +} +arch_initcall(dma_channel_table_init); + +/** + * dma_find_channel - find a channel to carry out the operation + * @tx_type: transaction type + */ +struct dma_chan *dma_find_channel(enum dma_transaction_type tx_type) +{ + return this_cpu_read(channel_table[tx_type]->chan); +} +EXPORT_SYMBOL(dma_find_channel); + +/** + * dma_issue_pending_all - flush all pending operations across all channels + */ +void dma_issue_pending_all(void) +{ + struct dma_device *device; + struct dma_chan *chan; + + rcu_read_lock(); + list_for_each_entry_rcu(device, &dma_device_list, global_node) { + if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) + continue; + list_for_each_entry(chan, &device->channels, device_node) + if (chan->client_count) + device->device_issue_pending(chan); + } + rcu_read_unlock(); +} +EXPORT_SYMBOL(dma_issue_pending_all); + +/** + * dma_chan_is_local - returns true if the channel is in the same numa-node as the cpu + */ +static bool dma_chan_is_local(struct dma_chan *chan, int cpu) +{ + int node = dev_to_node(chan->device->dev); + return node == -1 || cpumask_test_cpu(cpu, cpumask_of_node(node)); +} + +/** + * min_chan - returns the channel with min count and in the same numa-node as the cpu + * @cap: capability to match + * @cpu: cpu index which the channel should be close to + * + * If some channels are close to the given cpu, the one with the lowest + * reference count is returned. Otherwise, cpu is ignored and only the + * reference count is taken into account. + * Must be called under dma_list_mutex. + */ +static struct dma_chan *min_chan(enum dma_transaction_type cap, int cpu) +{ + struct dma_device *device; + struct dma_chan *chan; + struct dma_chan *min = NULL; + struct dma_chan *localmin = NULL; + + list_for_each_entry(device, &dma_device_list, global_node) { + if (!dma_has_cap(cap, device->cap_mask) || + dma_has_cap(DMA_PRIVATE, device->cap_mask)) + continue; + list_for_each_entry(chan, &device->channels, device_node) { + if (!chan->client_count) + continue; + if (!min || chan->table_count < min->table_count) + min = chan; + + if (dma_chan_is_local(chan, cpu)) + if (!localmin || + chan->table_count < localmin->table_count) + localmin = chan; + } + } + + chan = localmin ? localmin : min; + + if (chan) + chan->table_count++; + + return chan; +} + +/** + * dma_channel_rebalance - redistribute the available channels + * + * Optimize for cpu isolation (each cpu gets a dedicated channel for an + * operation type) in the SMP case, and operation isolation (avoid + * multi-tasking channels) in the non-SMP case. Must be called under + * dma_list_mutex. + */ +static void dma_channel_rebalance(void) +{ + struct dma_chan *chan; + struct dma_device *device; + int cpu; + int cap; + + /* undo the last distribution */ + for_each_dma_cap_mask(cap, dma_cap_mask_all) + for_each_possible_cpu(cpu) + per_cpu_ptr(channel_table[cap], cpu)->chan = NULL; + + list_for_each_entry(device, &dma_device_list, global_node) { + if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) + continue; + list_for_each_entry(chan, &device->channels, device_node) + chan->table_count = 0; + } + + /* don't populate the channel_table if no clients are available */ + if (!dmaengine_ref_count) + return; + + /* redistribute available channels */ + for_each_dma_cap_mask(cap, dma_cap_mask_all) + for_each_online_cpu(cpu) { + chan = min_chan(cap, cpu); + per_cpu_ptr(channel_table[cap], cpu)->chan = chan; + } +} + +int dma_get_slave_caps(struct dma_chan *chan, struct dma_slave_caps *caps) +{ + struct dma_device *device; + + if (!chan || !caps) + return -EINVAL; + + device = chan->device; + + /* check if the channel supports slave transactions */ + if (!test_bit(DMA_SLAVE, device->cap_mask.bits)) + return -ENXIO; + + /* + * Check whether it reports it uses the generic slave + * capabilities, if not, that means it doesn't support any + * kind of slave capabilities reporting. + */ + if (!device->directions) + return -ENXIO; + + caps->src_addr_widths = device->src_addr_widths; + caps->dst_addr_widths = device->dst_addr_widths; + caps->directions = device->directions; + caps->residue_granularity = device->residue_granularity; + + /* + * Some devices implement only pause (e.g. to get residuum) but no + * resume. However cmd_pause is advertised as pause AND resume. + */ + caps->cmd_pause = !!(device->device_pause && device->device_resume); + caps->cmd_terminate = !!device->device_terminate_all; + + return 0; +} +EXPORT_SYMBOL_GPL(dma_get_slave_caps); + +static struct dma_chan *private_candidate(const dma_cap_mask_t *mask, + struct dma_device *dev, + dma_filter_fn fn, void *fn_param) +{ + struct dma_chan *chan; + + if (!__dma_device_satisfies_mask(dev, mask)) { + pr_debug("%s: wrong capabilities\n", __func__); + return NULL; + } + /* devices with multiple channels need special handling as we need to + * ensure that all channels are either private or public. + */ + if (dev->chancnt > 1 && !dma_has_cap(DMA_PRIVATE, dev->cap_mask)) + list_for_each_entry(chan, &dev->channels, device_node) { + /* some channels are already publicly allocated */ + if (chan->client_count) + return NULL; + } + + list_for_each_entry(chan, &dev->channels, device_node) { + if (chan->client_count) { + pr_debug("%s: %s busy\n", + __func__, dma_chan_name(chan)); + continue; + } + if (fn && !fn(chan, fn_param)) { + pr_debug("%s: %s filter said false\n", + __func__, dma_chan_name(chan)); + continue; + } + return chan; + } + + return NULL; +} + +/** + * dma_request_slave_channel - try to get specific channel exclusively + * @chan: target channel + */ +struct dma_chan *dma_get_slave_channel(struct dma_chan *chan) +{ + int err = -EBUSY; + + /* lock against __dma_request_channel */ + mutex_lock(&dma_list_mutex); + + if (chan->client_count == 0) { + err = dma_chan_get(chan); + if (err) + pr_debug("%s: failed to get %s: (%d)\n", + __func__, dma_chan_name(chan), err); + } else + chan = NULL; + + mutex_unlock(&dma_list_mutex); + + + return chan; +} +EXPORT_SYMBOL_GPL(dma_get_slave_channel); + +struct dma_chan *dma_get_any_slave_channel(struct dma_device *device) +{ + dma_cap_mask_t mask; + struct dma_chan *chan; + int err; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + /* lock against __dma_request_channel */ + mutex_lock(&dma_list_mutex); + + chan = private_candidate(&mask, device, NULL, NULL); + if (chan) { + dma_cap_set(DMA_PRIVATE, device->cap_mask); + device->privatecnt++; + err = dma_chan_get(chan); + if (err) { + pr_debug("%s: failed to get %s: (%d)\n", + __func__, dma_chan_name(chan), err); + chan = NULL; + if (--device->privatecnt == 0) + dma_cap_clear(DMA_PRIVATE, device->cap_mask); + } + } + + mutex_unlock(&dma_list_mutex); + + return chan; +} +EXPORT_SYMBOL_GPL(dma_get_any_slave_channel); + +/** + * __dma_request_channel - try to allocate an exclusive channel + * @mask: capabilities that the channel must satisfy + * @fn: optional callback to disposition available channels + * @fn_param: opaque parameter to pass to dma_filter_fn + * + * Returns pointer to appropriate DMA channel on success or NULL. + */ +struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask, + dma_filter_fn fn, void *fn_param) +{ + struct dma_device *device, *_d; + struct dma_chan *chan = NULL; + int err; + + /* Find a channel */ + mutex_lock(&dma_list_mutex); + list_for_each_entry_safe(device, _d, &dma_device_list, global_node) { + chan = private_candidate(mask, device, fn, fn_param); + if (chan) { + /* Found a suitable channel, try to grab, prep, and + * return it. We first set DMA_PRIVATE to disable + * balance_ref_count as this channel will not be + * published in the general-purpose allocator + */ + dma_cap_set(DMA_PRIVATE, device->cap_mask); + device->privatecnt++; + err = dma_chan_get(chan); + + if (err == -ENODEV) { + pr_debug("%s: %s module removed\n", + __func__, dma_chan_name(chan)); + list_del_rcu(&device->global_node); + } else if (err) + pr_debug("%s: failed to get %s: (%d)\n", + __func__, dma_chan_name(chan), err); + else + break; + if (--device->privatecnt == 0) + dma_cap_clear(DMA_PRIVATE, device->cap_mask); + chan = NULL; + } + } + mutex_unlock(&dma_list_mutex); + + pr_debug("%s: %s (%s)\n", + __func__, + chan ? "success" : "fail", + chan ? dma_chan_name(chan) : NULL); + + return chan; +} +EXPORT_SYMBOL_GPL(__dma_request_channel); + +/** + * dma_request_slave_channel - try to allocate an exclusive slave channel + * @dev: pointer to client device structure + * @name: slave channel name + * + * Returns pointer to appropriate DMA channel on success or an error pointer. + */ +struct dma_chan *dma_request_slave_channel_reason(struct device *dev, + const char *name) +{ + /* If device-tree is present get slave info from here */ + if (dev->of_node) + return of_dma_request_slave_channel(dev->of_node, name); + + /* If device was enumerated by ACPI get slave info from here */ + if (ACPI_HANDLE(dev)) + return acpi_dma_request_slave_chan_by_name(dev, name); + + return ERR_PTR(-ENODEV); +} +EXPORT_SYMBOL_GPL(dma_request_slave_channel_reason); + +/** + * dma_request_slave_channel - try to allocate an exclusive slave channel + * @dev: pointer to client device structure + * @name: slave channel name + * + * Returns pointer to appropriate DMA channel on success or NULL. + */ +struct dma_chan *dma_request_slave_channel(struct device *dev, + const char *name) +{ + struct dma_chan *ch = dma_request_slave_channel_reason(dev, name); + if (IS_ERR(ch)) + return NULL; + return ch; +} +EXPORT_SYMBOL_GPL(dma_request_slave_channel); + +void dma_release_channel(struct dma_chan *chan) +{ + mutex_lock(&dma_list_mutex); + WARN_ONCE(chan->client_count != 1, + "chan reference count %d != 1\n", chan->client_count); + dma_chan_put(chan); + /* drop PRIVATE cap enabled by __dma_request_channel() */ + if (--chan->device->privatecnt == 0) + dma_cap_clear(DMA_PRIVATE, chan->device->cap_mask); + mutex_unlock(&dma_list_mutex); +} +EXPORT_SYMBOL_GPL(dma_release_channel); + +/** + * dmaengine_get - register interest in dma_channels + */ +void dmaengine_get(void) +{ + struct dma_device *device, *_d; + struct dma_chan *chan; + int err; + + mutex_lock(&dma_list_mutex); + dmaengine_ref_count++; + + /* try to grab channels */ + list_for_each_entry_safe(device, _d, &dma_device_list, global_node) { + if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) + continue; + list_for_each_entry(chan, &device->channels, device_node) { + err = dma_chan_get(chan); + if (err == -ENODEV) { + /* module removed before we could use it */ + list_del_rcu(&device->global_node); + break; + } else if (err) + pr_debug("%s: failed to get %s: (%d)\n", + __func__, dma_chan_name(chan), err); + } + } + + /* if this is the first reference and there were channels + * waiting we need to rebalance to get those channels + * incorporated into the channel table + */ + if (dmaengine_ref_count == 1) + dma_channel_rebalance(); + mutex_unlock(&dma_list_mutex); +} +EXPORT_SYMBOL(dmaengine_get); + +/** + * dmaengine_put - let dma drivers be removed when ref_count == 0 + */ +void dmaengine_put(void) +{ + struct dma_device *device; + struct dma_chan *chan; + + mutex_lock(&dma_list_mutex); + dmaengine_ref_count--; + BUG_ON(dmaengine_ref_count < 0); + /* drop channel references */ + list_for_each_entry(device, &dma_device_list, global_node) { + if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) + continue; + list_for_each_entry(chan, &device->channels, device_node) + dma_chan_put(chan); + } + mutex_unlock(&dma_list_mutex); +} +EXPORT_SYMBOL(dmaengine_put); + +static bool device_has_all_tx_types(struct dma_device *device) +{ + /* A device that satisfies this test has channels that will never cause + * an async_tx channel switch event as all possible operation types can + * be handled. + */ + #ifdef CONFIG_ASYNC_TX_DMA + if (!dma_has_cap(DMA_INTERRUPT, device->cap_mask)) + return false; + #endif + + #if defined(CONFIG_ASYNC_MEMCPY) || defined(CONFIG_ASYNC_MEMCPY_MODULE) + if (!dma_has_cap(DMA_MEMCPY, device->cap_mask)) + return false; + #endif + + #if defined(CONFIG_ASYNC_XOR) || defined(CONFIG_ASYNC_XOR_MODULE) + if (!dma_has_cap(DMA_XOR, device->cap_mask)) + return false; + + #ifndef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA + if (!dma_has_cap(DMA_XOR_VAL, device->cap_mask)) + return false; + #endif + #endif + + #if defined(CONFIG_ASYNC_PQ) || defined(CONFIG_ASYNC_PQ_MODULE) + if (!dma_has_cap(DMA_PQ, device->cap_mask)) + return false; + + #ifndef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA + if (!dma_has_cap(DMA_PQ_VAL, device->cap_mask)) + return false; + #endif + #endif + + return true; +} + +static int get_dma_id(struct dma_device *device) +{ + int rc; + + mutex_lock(&dma_list_mutex); + + rc = idr_alloc(&dma_idr, NULL, 0, 0, GFP_KERNEL); + if (rc >= 0) + device->dev_id = rc; + + mutex_unlock(&dma_list_mutex); + return rc < 0 ? rc : 0; +} + +/** + * dma_async_device_register - registers DMA devices found + * @device: &dma_device + */ +int dma_async_device_register(struct dma_device *device) +{ + int chancnt = 0, rc; + struct dma_chan* chan; + atomic_t *idr_ref; + + if (!device) + return -ENODEV; + + /* validate device routines */ + BUG_ON(dma_has_cap(DMA_MEMCPY, device->cap_mask) && + !device->device_prep_dma_memcpy); + BUG_ON(dma_has_cap(DMA_XOR, device->cap_mask) && + !device->device_prep_dma_xor); + BUG_ON(dma_has_cap(DMA_XOR_VAL, device->cap_mask) && + !device->device_prep_dma_xor_val); + BUG_ON(dma_has_cap(DMA_PQ, device->cap_mask) && + !device->device_prep_dma_pq); + BUG_ON(dma_has_cap(DMA_PQ_VAL, device->cap_mask) && + !device->device_prep_dma_pq_val); + BUG_ON(dma_has_cap(DMA_INTERRUPT, device->cap_mask) && + !device->device_prep_dma_interrupt); + BUG_ON(dma_has_cap(DMA_SG, device->cap_mask) && + !device->device_prep_dma_sg); + BUG_ON(dma_has_cap(DMA_CYCLIC, device->cap_mask) && + !device->device_prep_dma_cyclic); + BUG_ON(dma_has_cap(DMA_INTERLEAVE, device->cap_mask) && + !device->device_prep_interleaved_dma); + + BUG_ON(!device->device_tx_status); + BUG_ON(!device->device_issue_pending); + BUG_ON(!device->dev); + + /* note: this only matters in the + * CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH=n case + */ + if (device_has_all_tx_types(device)) + dma_cap_set(DMA_ASYNC_TX, device->cap_mask); + + idr_ref = kmalloc(sizeof(*idr_ref), GFP_KERNEL); + if (!idr_ref) + return -ENOMEM; + rc = get_dma_id(device); + if (rc != 0) { + kfree(idr_ref); + return rc; + } + + atomic_set(idr_ref, 0); + + /* represent channels in sysfs. Probably want devs too */ + list_for_each_entry(chan, &device->channels, device_node) { + rc = -ENOMEM; + chan->local = alloc_percpu(typeof(*chan->local)); + if (chan->local == NULL) + goto err_out; + chan->dev = kzalloc(sizeof(*chan->dev), GFP_KERNEL); + if (chan->dev == NULL) { + free_percpu(chan->local); + chan->local = NULL; + goto err_out; + } + + chan->chan_id = chancnt++; + chan->dev->device.class = &dma_devclass; + chan->dev->device.parent = device->dev; + chan->dev->chan = chan; + chan->dev->idr_ref = idr_ref; + chan->dev->dev_id = device->dev_id; + atomic_inc(idr_ref); + dev_set_name(&chan->dev->device, "dma%dchan%d", + device->dev_id, chan->chan_id); + + rc = device_register(&chan->dev->device); + if (rc) { + free_percpu(chan->local); + chan->local = NULL; + kfree(chan->dev); + atomic_dec(idr_ref); + goto err_out; + } + chan->client_count = 0; + } + device->chancnt = chancnt; + + mutex_lock(&dma_list_mutex); + /* take references on public channels */ + if (dmaengine_ref_count && !dma_has_cap(DMA_PRIVATE, device->cap_mask)) + list_for_each_entry(chan, &device->channels, device_node) { + /* if clients are already waiting for channels we need + * to take references on their behalf + */ + if (dma_chan_get(chan) == -ENODEV) { + /* note we can only get here for the first + * channel as the remaining channels are + * guaranteed to get a reference + */ + rc = -ENODEV; + mutex_unlock(&dma_list_mutex); + goto err_out; + } + } + list_add_tail_rcu(&device->global_node, &dma_device_list); + if (dma_has_cap(DMA_PRIVATE, device->cap_mask)) + device->privatecnt++; /* Always private */ + dma_channel_rebalance(); + mutex_unlock(&dma_list_mutex); + + return 0; + +err_out: + /* if we never registered a channel just release the idr */ + if (atomic_read(idr_ref) == 0) { + mutex_lock(&dma_list_mutex); + idr_remove(&dma_idr, device->dev_id); + mutex_unlock(&dma_list_mutex); + kfree(idr_ref); + return rc; + } + + list_for_each_entry(chan, &device->channels, device_node) { + if (chan->local == NULL) + continue; + mutex_lock(&dma_list_mutex); + chan->dev->chan = NULL; + mutex_unlock(&dma_list_mutex); + device_unregister(&chan->dev->device); + free_percpu(chan->local); + } + return rc; +} +EXPORT_SYMBOL(dma_async_device_register); + +/** + * dma_async_device_unregister - unregister a DMA device + * @device: &dma_device + * + * This routine is called by dma driver exit routines, dmaengine holds module + * references to prevent it being called while channels are in use. + */ +void dma_async_device_unregister(struct dma_device *device) +{ + struct dma_chan *chan; + + mutex_lock(&dma_list_mutex); + list_del_rcu(&device->global_node); + dma_channel_rebalance(); + mutex_unlock(&dma_list_mutex); + + list_for_each_entry(chan, &device->channels, device_node) { + WARN_ONCE(chan->client_count, + "%s called while %d clients hold a reference\n", + __func__, chan->client_count); + mutex_lock(&dma_list_mutex); + chan->dev->chan = NULL; + mutex_unlock(&dma_list_mutex); + device_unregister(&chan->dev->device); + free_percpu(chan->local); + } +} +EXPORT_SYMBOL(dma_async_device_unregister); + +struct dmaengine_unmap_pool { + struct kmem_cache *cache; + const char *name; + mempool_t *pool; + size_t size; +}; + +#define __UNMAP_POOL(x) { .size = x, .name = "dmaengine-unmap-" __stringify(x) } +static struct dmaengine_unmap_pool unmap_pool[] = { + __UNMAP_POOL(2), + #if IS_ENABLED(CONFIG_DMA_ENGINE_RAID) + __UNMAP_POOL(16), + __UNMAP_POOL(128), + __UNMAP_POOL(256), + #endif +}; + +static struct dmaengine_unmap_pool *__get_unmap_pool(int nr) +{ + int order = get_count_order(nr); + + switch (order) { + case 0 ... 1: + return &unmap_pool[0]; + case 2 ... 4: + return &unmap_pool[1]; + case 5 ... 7: + return &unmap_pool[2]; + case 8: + return &unmap_pool[3]; + default: + BUG(); + return NULL; + } +} + +static void dmaengine_unmap(struct kref *kref) +{ + struct dmaengine_unmap_data *unmap = container_of(kref, typeof(*unmap), kref); + struct device *dev = unmap->dev; + int cnt, i; + + cnt = unmap->to_cnt; + for (i = 0; i < cnt; i++) + dma_unmap_page(dev, unmap->addr[i], unmap->len, + DMA_TO_DEVICE); + cnt += unmap->from_cnt; + for (; i < cnt; i++) + dma_unmap_page(dev, unmap->addr[i], unmap->len, + DMA_FROM_DEVICE); + cnt += unmap->bidi_cnt; + for (; i < cnt; i++) { + if (unmap->addr[i] == 0) + continue; + dma_unmap_page(dev, unmap->addr[i], unmap->len, + DMA_BIDIRECTIONAL); + } + cnt = unmap->map_cnt; + mempool_free(unmap, __get_unmap_pool(cnt)->pool); +} + +void dmaengine_unmap_put(struct dmaengine_unmap_data *unmap) +{ + if (unmap) + kref_put(&unmap->kref, dmaengine_unmap); +} +EXPORT_SYMBOL_GPL(dmaengine_unmap_put); + +static void dmaengine_destroy_unmap_pool(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(unmap_pool); i++) { + struct dmaengine_unmap_pool *p = &unmap_pool[i]; + + if (p->pool) + mempool_destroy(p->pool); + p->pool = NULL; + if (p->cache) + kmem_cache_destroy(p->cache); + p->cache = NULL; + } +} + +static int __init dmaengine_init_unmap_pool(void) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(unmap_pool); i++) { + struct dmaengine_unmap_pool *p = &unmap_pool[i]; + size_t size; + + size = sizeof(struct dmaengine_unmap_data) + + sizeof(dma_addr_t) * p->size; + + p->cache = kmem_cache_create(p->name, size, 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!p->cache) + break; + p->pool = mempool_create_slab_pool(1, p->cache); + if (!p->pool) + break; + } + + if (i == ARRAY_SIZE(unmap_pool)) + return 0; + + dmaengine_destroy_unmap_pool(); + return -ENOMEM; +} + +struct dmaengine_unmap_data * +dmaengine_get_unmap_data(struct device *dev, int nr, gfp_t flags) +{ + struct dmaengine_unmap_data *unmap; + + unmap = mempool_alloc(__get_unmap_pool(nr)->pool, flags); + if (!unmap) + return NULL; + + memset(unmap, 0, sizeof(*unmap)); + kref_init(&unmap->kref); + unmap->dev = dev; + unmap->map_cnt = nr; + + return unmap; +} +EXPORT_SYMBOL(dmaengine_get_unmap_data); + +void dma_async_tx_descriptor_init(struct dma_async_tx_descriptor *tx, + struct dma_chan *chan) +{ + tx->chan = chan; + #ifdef CONFIG_ASYNC_TX_ENABLE_CHANNEL_SWITCH + spin_lock_init(&tx->lock); + #endif +} +EXPORT_SYMBOL(dma_async_tx_descriptor_init); + +/* dma_wait_for_async_tx - spin wait for a transaction to complete + * @tx: in-flight transaction to wait on + */ +enum dma_status +dma_wait_for_async_tx(struct dma_async_tx_descriptor *tx) +{ + unsigned long dma_sync_wait_timeout = jiffies + msecs_to_jiffies(5000); + + if (!tx) + return DMA_COMPLETE; + + while (tx->cookie == -EBUSY) { + if (time_after_eq(jiffies, dma_sync_wait_timeout)) { + pr_err("%s timeout waiting for descriptor submission\n", + __func__); + return DMA_ERROR; + } + cpu_relax(); + } + return dma_sync_wait(tx->chan, tx->cookie); +} +EXPORT_SYMBOL_GPL(dma_wait_for_async_tx); + +/* dma_run_dependencies - helper routine for dma drivers to process + * (start) dependent operations on their target channel + * @tx: transaction with dependencies + */ +void dma_run_dependencies(struct dma_async_tx_descriptor *tx) +{ + struct dma_async_tx_descriptor *dep = txd_next(tx); + struct dma_async_tx_descriptor *dep_next; + struct dma_chan *chan; + + if (!dep) + return; + + /* we'll submit tx->next now, so clear the link */ + txd_clear_next(tx); + chan = dep->chan; + + /* keep submitting up until a channel switch is detected + * in that case we will be called again as a result of + * processing the interrupt from async_tx_channel_switch + */ + for (; dep; dep = dep_next) { + txd_lock(dep); + txd_clear_parent(dep); + dep_next = txd_next(dep); + if (dep_next && dep_next->chan == chan) + txd_clear_next(dep); /* ->next will be submitted */ + else + dep_next = NULL; /* submit current dep and terminate */ + txd_unlock(dep); + + dep->tx_submit(dep); + } + + chan->device->device_issue_pending(chan); +} +EXPORT_SYMBOL_GPL(dma_run_dependencies); + +static int __init dma_bus_init(void) +{ + int err = dmaengine_init_unmap_pool(); + + if (err) + return err; + return class_register(&dma_devclass); +} +arch_initcall(dma_bus_init); + + diff --git a/drivers/dma/dmaengine.h b/drivers/dma/dmaengine.h new file mode 100644 index 000000000..17f983a4e --- /dev/null +++ b/drivers/dma/dmaengine.h @@ -0,0 +1,89 @@ +/* + * The contents of this file are private to DMA engine drivers, and is not + * part of the API to be used by DMA engine users. + */ +#ifndef DMAENGINE_H +#define DMAENGINE_H + +#include <linux/bug.h> +#include <linux/dmaengine.h> + +/** + * dma_cookie_init - initialize the cookies for a DMA channel + * @chan: dma channel to initialize + */ +static inline void dma_cookie_init(struct dma_chan *chan) +{ + chan->cookie = DMA_MIN_COOKIE; + chan->completed_cookie = DMA_MIN_COOKIE; +} + +/** + * dma_cookie_assign - assign a DMA engine cookie to the descriptor + * @tx: descriptor needing cookie + * + * Assign a unique non-zero per-channel cookie to the descriptor. + * Note: caller is expected to hold a lock to prevent concurrency. + */ +static inline dma_cookie_t dma_cookie_assign(struct dma_async_tx_descriptor *tx) +{ + struct dma_chan *chan = tx->chan; + dma_cookie_t cookie; + + cookie = chan->cookie + 1; + if (cookie < DMA_MIN_COOKIE) + cookie = DMA_MIN_COOKIE; + tx->cookie = chan->cookie = cookie; + + return cookie; +} + +/** + * dma_cookie_complete - complete a descriptor + * @tx: descriptor to complete + * + * Mark this descriptor complete by updating the channels completed + * cookie marker. Zero the descriptors cookie to prevent accidental + * repeated completions. + * + * Note: caller is expected to hold a lock to prevent concurrency. + */ +static inline void dma_cookie_complete(struct dma_async_tx_descriptor *tx) +{ + BUG_ON(tx->cookie < DMA_MIN_COOKIE); + tx->chan->completed_cookie = tx->cookie; + tx->cookie = 0; +} + +/** + * dma_cookie_status - report cookie status + * @chan: dma channel + * @cookie: cookie we are interested in + * @state: dma_tx_state structure to return last/used cookies + * + * Report the status of the cookie, filling in the state structure if + * non-NULL. No locking is required. + */ +static inline enum dma_status dma_cookie_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + dma_cookie_t used, complete; + + used = chan->cookie; + complete = chan->completed_cookie; + barrier(); + if (state) { + state->last = complete; + state->used = used; + state->residue = 0; + } + return dma_async_is_complete(cookie, complete, used); +} + +static inline void dma_set_residue(struct dma_tx_state *state, u32 residue) +{ + if (state) + state->residue = residue; +} + +#endif diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c new file mode 100644 index 000000000..220ee4963 --- /dev/null +++ b/drivers/dma/dmatest.c @@ -0,0 +1,987 @@ +/* + * DMA Engine test module + * + * Copyright (C) 2007 Atmel Corporation + * Copyright (C) 2013 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/freezer.h> +#include <linux/init.h> +#include <linux/kthread.h> +#include <linux/module.h> +#include <linux/moduleparam.h> +#include <linux/random.h> +#include <linux/slab.h> +#include <linux/wait.h> + +static unsigned int test_buf_size = 16384; +module_param(test_buf_size, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(test_buf_size, "Size of the memcpy test buffer"); + +static char test_channel[20]; +module_param_string(channel, test_channel, sizeof(test_channel), + S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)"); + +static char test_device[32]; +module_param_string(device, test_device, sizeof(test_device), + S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)"); + +static unsigned int threads_per_chan = 1; +module_param(threads_per_chan, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(threads_per_chan, + "Number of threads to start per channel (default: 1)"); + +static unsigned int max_channels; +module_param(max_channels, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(max_channels, + "Maximum number of channels to use (default: all)"); + +static unsigned int iterations; +module_param(iterations, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(iterations, + "Iterations before stopping test (default: infinite)"); + +static unsigned int xor_sources = 3; +module_param(xor_sources, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(xor_sources, + "Number of xor source buffers (default: 3)"); + +static unsigned int pq_sources = 3; +module_param(pq_sources, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(pq_sources, + "Number of p+q source buffers (default: 3)"); + +static int timeout = 3000; +module_param(timeout, uint, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), " + "Pass -1 for infinite timeout"); + +static bool noverify; +module_param(noverify, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(noverify, "Disable random data setup and verification"); + +static bool verbose; +module_param(verbose, bool, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(verbose, "Enable \"success\" result messages (default: off)"); + +/** + * struct dmatest_params - test parameters. + * @buf_size: size of the memcpy test buffer + * @channel: bus ID of the channel to test + * @device: bus ID of the DMA Engine to test + * @threads_per_chan: number of threads to start per channel + * @max_channels: maximum number of channels to use + * @iterations: iterations before stopping test + * @xor_sources: number of xor source buffers + * @pq_sources: number of p+q source buffers + * @timeout: transfer timeout in msec, -1 for infinite timeout + */ +struct dmatest_params { + unsigned int buf_size; + char channel[20]; + char device[32]; + unsigned int threads_per_chan; + unsigned int max_channels; + unsigned int iterations; + unsigned int xor_sources; + unsigned int pq_sources; + int timeout; + bool noverify; +}; + +/** + * struct dmatest_info - test information. + * @params: test parameters + * @lock: access protection to the fields of this structure + */ +static struct dmatest_info { + /* Test parameters */ + struct dmatest_params params; + + /* Internal state */ + struct list_head channels; + unsigned int nr_channels; + struct mutex lock; + bool did_init; +} test_info = { + .channels = LIST_HEAD_INIT(test_info.channels), + .lock = __MUTEX_INITIALIZER(test_info.lock), +}; + +static int dmatest_run_set(const char *val, const struct kernel_param *kp); +static int dmatest_run_get(char *val, const struct kernel_param *kp); +static struct kernel_param_ops run_ops = { + .set = dmatest_run_set, + .get = dmatest_run_get, +}; +static bool dmatest_run; +module_param_cb(run, &run_ops, &dmatest_run, S_IRUGO | S_IWUSR); +MODULE_PARM_DESC(run, "Run the test (default: false)"); + +/* Maximum amount of mismatched bytes in buffer to print */ +#define MAX_ERROR_COUNT 32 + +/* + * Initialization patterns. All bytes in the source buffer has bit 7 + * set, all bytes in the destination buffer has bit 7 cleared. + * + * Bit 6 is set for all bytes which are to be copied by the DMA + * engine. Bit 5 is set for all bytes which are to be overwritten by + * the DMA engine. + * + * The remaining bits are the inverse of a counter which increments by + * one for each byte address. + */ +#define PATTERN_SRC 0x80 +#define PATTERN_DST 0x00 +#define PATTERN_COPY 0x40 +#define PATTERN_OVERWRITE 0x20 +#define PATTERN_COUNT_MASK 0x1f + +struct dmatest_thread { + struct list_head node; + struct dmatest_info *info; + struct task_struct *task; + struct dma_chan *chan; + u8 **srcs; + u8 **dsts; + enum dma_transaction_type type; + bool done; +}; + +struct dmatest_chan { + struct list_head node; + struct dma_chan *chan; + struct list_head threads; +}; + +static DECLARE_WAIT_QUEUE_HEAD(thread_wait); +static bool wait; + +static bool is_threaded_test_run(struct dmatest_info *info) +{ + struct dmatest_chan *dtc; + + list_for_each_entry(dtc, &info->channels, node) { + struct dmatest_thread *thread; + + list_for_each_entry(thread, &dtc->threads, node) { + if (!thread->done) + return true; + } + } + + return false; +} + +static int dmatest_wait_get(char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + struct dmatest_params *params = &info->params; + + if (params->iterations) + wait_event(thread_wait, !is_threaded_test_run(info)); + wait = true; + return param_get_bool(val, kp); +} + +static struct kernel_param_ops wait_ops = { + .get = dmatest_wait_get, + .set = param_set_bool, +}; +module_param_cb(wait, &wait_ops, &wait, S_IRUGO); +MODULE_PARM_DESC(wait, "Wait for tests to complete (default: false)"); + +static bool dmatest_match_channel(struct dmatest_params *params, + struct dma_chan *chan) +{ + if (params->channel[0] == '\0') + return true; + return strcmp(dma_chan_name(chan), params->channel) == 0; +} + +static bool dmatest_match_device(struct dmatest_params *params, + struct dma_device *device) +{ + if (params->device[0] == '\0') + return true; + return strcmp(dev_name(device->dev), params->device) == 0; +} + +static unsigned long dmatest_random(void) +{ + unsigned long buf; + + prandom_bytes(&buf, sizeof(buf)); + return buf; +} + +static void dmatest_init_srcs(u8 **bufs, unsigned int start, unsigned int len, + unsigned int buf_size) +{ + unsigned int i; + u8 *buf; + + for (; (buf = *bufs); bufs++) { + for (i = 0; i < start; i++) + buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); + for ( ; i < start + len; i++) + buf[i] = PATTERN_SRC | PATTERN_COPY + | (~i & PATTERN_COUNT_MASK); + for ( ; i < buf_size; i++) + buf[i] = PATTERN_SRC | (~i & PATTERN_COUNT_MASK); + buf++; + } +} + +static void dmatest_init_dsts(u8 **bufs, unsigned int start, unsigned int len, + unsigned int buf_size) +{ + unsigned int i; + u8 *buf; + + for (; (buf = *bufs); bufs++) { + for (i = 0; i < start; i++) + buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); + for ( ; i < start + len; i++) + buf[i] = PATTERN_DST | PATTERN_OVERWRITE + | (~i & PATTERN_COUNT_MASK); + for ( ; i < buf_size; i++) + buf[i] = PATTERN_DST | (~i & PATTERN_COUNT_MASK); + } +} + +static void dmatest_mismatch(u8 actual, u8 pattern, unsigned int index, + unsigned int counter, bool is_srcbuf) +{ + u8 diff = actual ^ pattern; + u8 expected = pattern | (~counter & PATTERN_COUNT_MASK); + const char *thread_name = current->comm; + + if (is_srcbuf) + pr_warn("%s: srcbuf[0x%x] overwritten! Expected %02x, got %02x\n", + thread_name, index, expected, actual); + else if ((pattern & PATTERN_COPY) + && (diff & (PATTERN_COPY | PATTERN_OVERWRITE))) + pr_warn("%s: dstbuf[0x%x] not copied! Expected %02x, got %02x\n", + thread_name, index, expected, actual); + else if (diff & PATTERN_SRC) + pr_warn("%s: dstbuf[0x%x] was copied! Expected %02x, got %02x\n", + thread_name, index, expected, actual); + else + pr_warn("%s: dstbuf[0x%x] mismatch! Expected %02x, got %02x\n", + thread_name, index, expected, actual); +} + +static unsigned int dmatest_verify(u8 **bufs, unsigned int start, + unsigned int end, unsigned int counter, u8 pattern, + bool is_srcbuf) +{ + unsigned int i; + unsigned int error_count = 0; + u8 actual; + u8 expected; + u8 *buf; + unsigned int counter_orig = counter; + + for (; (buf = *bufs); bufs++) { + counter = counter_orig; + for (i = start; i < end; i++) { + actual = buf[i]; + expected = pattern | (~counter & PATTERN_COUNT_MASK); + if (actual != expected) { + if (error_count < MAX_ERROR_COUNT) + dmatest_mismatch(actual, pattern, i, + counter, is_srcbuf); + error_count++; + } + counter++; + } + } + + if (error_count > MAX_ERROR_COUNT) + pr_warn("%s: %u errors suppressed\n", + current->comm, error_count - MAX_ERROR_COUNT); + + return error_count; +} + +/* poor man's completion - we want to use wait_event_freezable() on it */ +struct dmatest_done { + bool done; + wait_queue_head_t *wait; +}; + +static void dmatest_callback(void *arg) +{ + struct dmatest_done *done = arg; + + done->done = true; + wake_up_all(done->wait); +} + +static unsigned int min_odd(unsigned int x, unsigned int y) +{ + unsigned int val = min(x, y); + + return val % 2 ? val : val - 1; +} + +static void result(const char *err, unsigned int n, unsigned int src_off, + unsigned int dst_off, unsigned int len, unsigned long data) +{ + pr_info("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n", + current->comm, n, err, src_off, dst_off, len, data); +} + +static void dbg_result(const char *err, unsigned int n, unsigned int src_off, + unsigned int dst_off, unsigned int len, + unsigned long data) +{ + pr_debug("%s: result #%u: '%s' with src_off=0x%x dst_off=0x%x len=0x%x (%lu)\n", + current->comm, n, err, src_off, dst_off, len, data); +} + +#define verbose_result(err, n, src_off, dst_off, len, data) ({ \ + if (verbose) \ + result(err, n, src_off, dst_off, len, data); \ + else \ + dbg_result(err, n, src_off, dst_off, len, data);\ +}) + +static unsigned long long dmatest_persec(s64 runtime, unsigned int val) +{ + unsigned long long per_sec = 1000000; + + if (runtime <= 0) + return 0; + + /* drop precision until runtime is 32-bits */ + while (runtime > UINT_MAX) { + runtime >>= 1; + per_sec <<= 1; + } + + per_sec *= val; + do_div(per_sec, runtime); + return per_sec; +} + +static unsigned long long dmatest_KBs(s64 runtime, unsigned long long len) +{ + return dmatest_persec(runtime, len >> 10); +} + +/* + * This function repeatedly tests DMA transfers of various lengths and + * offsets for a given operation type until it is told to exit by + * kthread_stop(). There may be multiple threads running this function + * in parallel for a single channel, and there may be multiple channels + * being tested in parallel. + * + * Before each test, the source and destination buffer is initialized + * with a known pattern. This pattern is different depending on + * whether it's in an area which is supposed to be copied or + * overwritten, and different in the source and destination buffers. + * So if the DMA engine doesn't copy exactly what we tell it to copy, + * we'll notice. + */ +static int dmatest_func(void *data) +{ + DECLARE_WAIT_QUEUE_HEAD_ONSTACK(done_wait); + struct dmatest_thread *thread = data; + struct dmatest_done done = { .wait = &done_wait }; + struct dmatest_info *info; + struct dmatest_params *params; + struct dma_chan *chan; + struct dma_device *dev; + unsigned int error_count; + unsigned int failed_tests = 0; + unsigned int total_tests = 0; + dma_cookie_t cookie; + enum dma_status status; + enum dma_ctrl_flags flags; + u8 *pq_coefs = NULL; + int ret; + int src_cnt; + int dst_cnt; + int i; + ktime_t ktime; + s64 runtime = 0; + unsigned long long total_len = 0; + + set_freezable(); + + ret = -ENOMEM; + + smp_rmb(); + info = thread->info; + params = &info->params; + chan = thread->chan; + dev = chan->device; + if (thread->type == DMA_MEMCPY) + src_cnt = dst_cnt = 1; + else if (thread->type == DMA_XOR) { + /* force odd to ensure dst = src */ + src_cnt = min_odd(params->xor_sources | 1, dev->max_xor); + dst_cnt = 1; + } else if (thread->type == DMA_PQ) { + /* force odd to ensure dst = src */ + src_cnt = min_odd(params->pq_sources | 1, dma_maxpq(dev, 0)); + dst_cnt = 2; + + pq_coefs = kmalloc(params->pq_sources+1, GFP_KERNEL); + if (!pq_coefs) + goto err_thread_type; + + for (i = 0; i < src_cnt; i++) + pq_coefs[i] = 1; + } else + goto err_thread_type; + + thread->srcs = kcalloc(src_cnt+1, sizeof(u8 *), GFP_KERNEL); + if (!thread->srcs) + goto err_srcs; + for (i = 0; i < src_cnt; i++) { + thread->srcs[i] = kmalloc(params->buf_size, GFP_KERNEL); + if (!thread->srcs[i]) + goto err_srcbuf; + } + thread->srcs[i] = NULL; + + thread->dsts = kcalloc(dst_cnt+1, sizeof(u8 *), GFP_KERNEL); + if (!thread->dsts) + goto err_dsts; + for (i = 0; i < dst_cnt; i++) { + thread->dsts[i] = kmalloc(params->buf_size, GFP_KERNEL); + if (!thread->dsts[i]) + goto err_dstbuf; + } + thread->dsts[i] = NULL; + + set_user_nice(current, 10); + + /* + * src and dst buffers are freed by ourselves below + */ + flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT; + + ktime = ktime_get(); + while (!kthread_should_stop() + && !(params->iterations && total_tests >= params->iterations)) { + struct dma_async_tx_descriptor *tx = NULL; + struct dmaengine_unmap_data *um; + dma_addr_t srcs[src_cnt]; + dma_addr_t *dsts; + unsigned int src_off, dst_off, len; + u8 align = 0; + + total_tests++; + + /* honor alignment restrictions */ + if (thread->type == DMA_MEMCPY) + align = dev->copy_align; + else if (thread->type == DMA_XOR) + align = dev->xor_align; + else if (thread->type == DMA_PQ) + align = dev->pq_align; + + if (1 << align > params->buf_size) { + pr_err("%u-byte buffer too small for %d-byte alignment\n", + params->buf_size, 1 << align); + break; + } + + if (params->noverify) + len = params->buf_size; + else + len = dmatest_random() % params->buf_size + 1; + + len = (len >> align) << align; + if (!len) + len = 1 << align; + + total_len += len; + + if (params->noverify) { + src_off = 0; + dst_off = 0; + } else { + src_off = dmatest_random() % (params->buf_size - len + 1); + dst_off = dmatest_random() % (params->buf_size - len + 1); + + src_off = (src_off >> align) << align; + dst_off = (dst_off >> align) << align; + + dmatest_init_srcs(thread->srcs, src_off, len, + params->buf_size); + dmatest_init_dsts(thread->dsts, dst_off, len, + params->buf_size); + } + + um = dmaengine_get_unmap_data(dev->dev, src_cnt+dst_cnt, + GFP_KERNEL); + if (!um) { + failed_tests++; + result("unmap data NULL", total_tests, + src_off, dst_off, len, ret); + continue; + } + + um->len = params->buf_size; + for (i = 0; i < src_cnt; i++) { + void *buf = thread->srcs[i]; + struct page *pg = virt_to_page(buf); + unsigned pg_off = (unsigned long) buf & ~PAGE_MASK; + + um->addr[i] = dma_map_page(dev->dev, pg, pg_off, + um->len, DMA_TO_DEVICE); + srcs[i] = um->addr[i] + src_off; + ret = dma_mapping_error(dev->dev, um->addr[i]); + if (ret) { + dmaengine_unmap_put(um); + result("src mapping error", total_tests, + src_off, dst_off, len, ret); + failed_tests++; + continue; + } + um->to_cnt++; + } + /* map with DMA_BIDIRECTIONAL to force writeback/invalidate */ + dsts = &um->addr[src_cnt]; + for (i = 0; i < dst_cnt; i++) { + void *buf = thread->dsts[i]; + struct page *pg = virt_to_page(buf); + unsigned pg_off = (unsigned long) buf & ~PAGE_MASK; + + dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len, + DMA_BIDIRECTIONAL); + ret = dma_mapping_error(dev->dev, dsts[i]); + if (ret) { + dmaengine_unmap_put(um); + result("dst mapping error", total_tests, + src_off, dst_off, len, ret); + failed_tests++; + continue; + } + um->bidi_cnt++; + } + + if (thread->type == DMA_MEMCPY) + tx = dev->device_prep_dma_memcpy(chan, + dsts[0] + dst_off, + srcs[0], len, flags); + else if (thread->type == DMA_XOR) + tx = dev->device_prep_dma_xor(chan, + dsts[0] + dst_off, + srcs, src_cnt, + len, flags); + else if (thread->type == DMA_PQ) { + dma_addr_t dma_pq[dst_cnt]; + + for (i = 0; i < dst_cnt; i++) + dma_pq[i] = dsts[i] + dst_off; + tx = dev->device_prep_dma_pq(chan, dma_pq, srcs, + src_cnt, pq_coefs, + len, flags); + } + + if (!tx) { + dmaengine_unmap_put(um); + result("prep error", total_tests, src_off, + dst_off, len, ret); + msleep(100); + failed_tests++; + continue; + } + + done.done = false; + tx->callback = dmatest_callback; + tx->callback_param = &done; + cookie = tx->tx_submit(tx); + + if (dma_submit_error(cookie)) { + dmaengine_unmap_put(um); + result("submit error", total_tests, src_off, + dst_off, len, ret); + msleep(100); + failed_tests++; + continue; + } + dma_async_issue_pending(chan); + + wait_event_freezable_timeout(done_wait, done.done, + msecs_to_jiffies(params->timeout)); + + status = dma_async_is_tx_complete(chan, cookie, NULL, NULL); + + if (!done.done) { + /* + * We're leaving the timed out dma operation with + * dangling pointer to done_wait. To make this + * correct, we'll need to allocate wait_done for + * each test iteration and perform "who's gonna + * free it this time?" dancing. For now, just + * leave it dangling. + */ + dmaengine_unmap_put(um); + result("test timed out", total_tests, src_off, dst_off, + len, 0); + failed_tests++; + continue; + } else if (status != DMA_COMPLETE) { + dmaengine_unmap_put(um); + result(status == DMA_ERROR ? + "completion error status" : + "completion busy status", total_tests, src_off, + dst_off, len, ret); + failed_tests++; + continue; + } + + dmaengine_unmap_put(um); + + if (params->noverify) { + verbose_result("test passed", total_tests, src_off, + dst_off, len, 0); + continue; + } + + pr_debug("%s: verifying source buffer...\n", current->comm); + error_count = dmatest_verify(thread->srcs, 0, src_off, + 0, PATTERN_SRC, true); + error_count += dmatest_verify(thread->srcs, src_off, + src_off + len, src_off, + PATTERN_SRC | PATTERN_COPY, true); + error_count += dmatest_verify(thread->srcs, src_off + len, + params->buf_size, src_off + len, + PATTERN_SRC, true); + + pr_debug("%s: verifying dest buffer...\n", current->comm); + error_count += dmatest_verify(thread->dsts, 0, dst_off, + 0, PATTERN_DST, false); + error_count += dmatest_verify(thread->dsts, dst_off, + dst_off + len, src_off, + PATTERN_SRC | PATTERN_COPY, false); + error_count += dmatest_verify(thread->dsts, dst_off + len, + params->buf_size, dst_off + len, + PATTERN_DST, false); + + if (error_count) { + result("data error", total_tests, src_off, dst_off, + len, error_count); + failed_tests++; + } else { + verbose_result("test passed", total_tests, src_off, + dst_off, len, 0); + } + } + runtime = ktime_us_delta(ktime_get(), ktime); + + ret = 0; +err_dstbuf: + for (i = 0; thread->dsts[i]; i++) + kfree(thread->dsts[i]); + kfree(thread->dsts); +err_dsts: +err_srcbuf: + for (i = 0; thread->srcs[i]; i++) + kfree(thread->srcs[i]); + kfree(thread->srcs); +err_srcs: + kfree(pq_coefs); +err_thread_type: + pr_info("%s: summary %u tests, %u failures %llu iops %llu KB/s (%d)\n", + current->comm, total_tests, failed_tests, + dmatest_persec(runtime, total_tests), + dmatest_KBs(runtime, total_len), ret); + + /* terminate all transfers on specified channels */ + if (ret) + dmaengine_terminate_all(chan); + + thread->done = true; + wake_up(&thread_wait); + + return ret; +} + +static void dmatest_cleanup_channel(struct dmatest_chan *dtc) +{ + struct dmatest_thread *thread; + struct dmatest_thread *_thread; + int ret; + + list_for_each_entry_safe(thread, _thread, &dtc->threads, node) { + ret = kthread_stop(thread->task); + pr_debug("thread %s exited with status %d\n", + thread->task->comm, ret); + list_del(&thread->node); + put_task_struct(thread->task); + kfree(thread); + } + + /* terminate all transfers on specified channels */ + dmaengine_terminate_all(dtc->chan); + + kfree(dtc); +} + +static int dmatest_add_threads(struct dmatest_info *info, + struct dmatest_chan *dtc, enum dma_transaction_type type) +{ + struct dmatest_params *params = &info->params; + struct dmatest_thread *thread; + struct dma_chan *chan = dtc->chan; + char *op; + unsigned int i; + + if (type == DMA_MEMCPY) + op = "copy"; + else if (type == DMA_XOR) + op = "xor"; + else if (type == DMA_PQ) + op = "pq"; + else + return -EINVAL; + + for (i = 0; i < params->threads_per_chan; i++) { + thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL); + if (!thread) { + pr_warn("No memory for %s-%s%u\n", + dma_chan_name(chan), op, i); + break; + } + thread->info = info; + thread->chan = dtc->chan; + thread->type = type; + smp_wmb(); + thread->task = kthread_create(dmatest_func, thread, "%s-%s%u", + dma_chan_name(chan), op, i); + if (IS_ERR(thread->task)) { + pr_warn("Failed to create thread %s-%s%u\n", + dma_chan_name(chan), op, i); + kfree(thread); + break; + } + + /* srcbuf and dstbuf are allocated by the thread itself */ + get_task_struct(thread->task); + list_add_tail(&thread->node, &dtc->threads); + wake_up_process(thread->task); + } + + return i; +} + +static int dmatest_add_channel(struct dmatest_info *info, + struct dma_chan *chan) +{ + struct dmatest_chan *dtc; + struct dma_device *dma_dev = chan->device; + unsigned int thread_count = 0; + int cnt; + + dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL); + if (!dtc) { + pr_warn("No memory for %s\n", dma_chan_name(chan)); + return -ENOMEM; + } + + dtc->chan = chan; + INIT_LIST_HEAD(&dtc->threads); + + if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { + cnt = dmatest_add_threads(info, dtc, DMA_MEMCPY); + thread_count += cnt > 0 ? cnt : 0; + } + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + cnt = dmatest_add_threads(info, dtc, DMA_XOR); + thread_count += cnt > 0 ? cnt : 0; + } + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { + cnt = dmatest_add_threads(info, dtc, DMA_PQ); + thread_count += cnt > 0 ? cnt : 0; + } + + pr_info("Started %u threads using %s\n", + thread_count, dma_chan_name(chan)); + + list_add_tail(&dtc->node, &info->channels); + info->nr_channels++; + + return 0; +} + +static bool filter(struct dma_chan *chan, void *param) +{ + struct dmatest_params *params = param; + + if (!dmatest_match_channel(params, chan) || + !dmatest_match_device(params, chan->device)) + return false; + else + return true; +} + +static void request_channels(struct dmatest_info *info, + enum dma_transaction_type type) +{ + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(type, mask); + for (;;) { + struct dmatest_params *params = &info->params; + struct dma_chan *chan; + + chan = dma_request_channel(mask, filter, params); + if (chan) { + if (dmatest_add_channel(info, chan)) { + dma_release_channel(chan); + break; /* add_channel failed, punt */ + } + } else + break; /* no more channels available */ + if (params->max_channels && + info->nr_channels >= params->max_channels) + break; /* we have all we need */ + } +} + +static void run_threaded_test(struct dmatest_info *info) +{ + struct dmatest_params *params = &info->params; + + /* Copy test parameters */ + params->buf_size = test_buf_size; + strlcpy(params->channel, strim(test_channel), sizeof(params->channel)); + strlcpy(params->device, strim(test_device), sizeof(params->device)); + params->threads_per_chan = threads_per_chan; + params->max_channels = max_channels; + params->iterations = iterations; + params->xor_sources = xor_sources; + params->pq_sources = pq_sources; + params->timeout = timeout; + params->noverify = noverify; + + request_channels(info, DMA_MEMCPY); + request_channels(info, DMA_XOR); + request_channels(info, DMA_PQ); +} + +static void stop_threaded_test(struct dmatest_info *info) +{ + struct dmatest_chan *dtc, *_dtc; + struct dma_chan *chan; + + list_for_each_entry_safe(dtc, _dtc, &info->channels, node) { + list_del(&dtc->node); + chan = dtc->chan; + dmatest_cleanup_channel(dtc); + pr_debug("dropped channel %s\n", dma_chan_name(chan)); + dma_release_channel(chan); + } + + info->nr_channels = 0; +} + +static void restart_threaded_test(struct dmatest_info *info, bool run) +{ + /* we might be called early to set run=, defer running until all + * parameters have been evaluated + */ + if (!info->did_init) + return; + + /* Stop any running test first */ + stop_threaded_test(info); + + /* Run test with new parameters */ + run_threaded_test(info); +} + +static int dmatest_run_get(char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + + mutex_lock(&info->lock); + if (is_threaded_test_run(info)) { + dmatest_run = true; + } else { + stop_threaded_test(info); + dmatest_run = false; + } + mutex_unlock(&info->lock); + + return param_get_bool(val, kp); +} + +static int dmatest_run_set(const char *val, const struct kernel_param *kp) +{ + struct dmatest_info *info = &test_info; + int ret; + + mutex_lock(&info->lock); + ret = param_set_bool(val, kp); + if (ret) { + mutex_unlock(&info->lock); + return ret; + } + + if (is_threaded_test_run(info)) + ret = -EBUSY; + else if (dmatest_run) + restart_threaded_test(info, dmatest_run); + + mutex_unlock(&info->lock); + + return ret; +} + +static int __init dmatest_init(void) +{ + struct dmatest_info *info = &test_info; + struct dmatest_params *params = &info->params; + + if (dmatest_run) { + mutex_lock(&info->lock); + run_threaded_test(info); + mutex_unlock(&info->lock); + } + + if (params->iterations && wait) + wait_event(thread_wait, !is_threaded_test_run(info)); + + /* module parameters are stable, inittime tests are started, + * let userspace take over 'run' control + */ + info->did_init = true; + + return 0; +} +/* when compiled-in wait for drivers to load first */ +late_initcall(dmatest_init); + +static void __exit dmatest_exit(void) +{ + struct dmatest_info *info = &test_info; + + mutex_lock(&info->lock); + stop_threaded_test(info); + mutex_unlock(&info->lock); +} +module_exit(dmatest_exit); + +MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig new file mode 100644 index 000000000..36e02f0f6 --- /dev/null +++ b/drivers/dma/dw/Kconfig @@ -0,0 +1,28 @@ +# +# DMA engine configuration for dw +# + +config DW_DMAC_CORE + tristate + select DMA_ENGINE + +config DW_DMAC + tristate "Synopsys DesignWare AHB DMA platform driver" + select DW_DMAC_CORE + select DW_DMAC_BIG_ENDIAN_IO if AVR32 + default y if CPU_AT32AP7000 + help + Support the Synopsys DesignWare AHB DMA controller. This + can be integrated in chips such as the Atmel AT32ap7000. + +config DW_DMAC_PCI + tristate "Synopsys DesignWare AHB DMA PCI driver" + depends on PCI + select DW_DMAC_CORE + help + Support the Synopsys DesignWare AHB DMA controller on the + platfroms that enumerate it as a PCI device. For example, + Intel Medfield has integrated this GPDMA controller. + +config DW_DMAC_BIG_ENDIAN_IO + bool diff --git a/drivers/dma/dw/Makefile b/drivers/dma/dw/Makefile new file mode 100644 index 000000000..3eebd1ce2 --- /dev/null +++ b/drivers/dma/dw/Makefile @@ -0,0 +1,8 @@ +obj-$(CONFIG_DW_DMAC_CORE) += dw_dmac_core.o +dw_dmac_core-objs := core.o + +obj-$(CONFIG_DW_DMAC) += dw_dmac.o +dw_dmac-objs := platform.o + +obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o +dw_dmac_pci-objs := pci.o diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c new file mode 100644 index 000000000..1022c2e1a --- /dev/null +++ b/drivers/dma/dw/core.c @@ -0,0 +1,1749 @@ +/* + * Core driver for the Synopsys DesignWare DMA Controller + * + * Copyright (C) 2007-2008 Atmel Corporation + * Copyright (C) 2010-2011 ST Microelectronics + * Copyright (C) 2013 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/bitops.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> + +#include "../dmaengine.h" +#include "internal.h" + +/* + * This supports the Synopsys "DesignWare AHB Central DMA Controller", + * (DW_ahb_dmac) which is used with various AMBA 2.0 systems (not all + * of which use ARM any more). See the "Databook" from Synopsys for + * information beyond what licensees probably provide. + * + * The driver has been tested with the Atmel AT32AP7000, which does not + * support descriptor writeback. + */ + +#define DWC_DEFAULT_CTLLO(_chan) ({ \ + struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan); \ + struct dma_slave_config *_sconfig = &_dwc->dma_sconfig; \ + bool _is_slave = is_slave_direction(_dwc->direction); \ + u8 _smsize = _is_slave ? _sconfig->src_maxburst : \ + DW_DMA_MSIZE_16; \ + u8 _dmsize = _is_slave ? _sconfig->dst_maxburst : \ + DW_DMA_MSIZE_16; \ + \ + (DWC_CTLL_DST_MSIZE(_dmsize) \ + | DWC_CTLL_SRC_MSIZE(_smsize) \ + | DWC_CTLL_LLP_D_EN \ + | DWC_CTLL_LLP_S_EN \ + | DWC_CTLL_DMS(_dwc->dst_master) \ + | DWC_CTLL_SMS(_dwc->src_master)); \ + }) + +/* + * Number of descriptors to allocate for each channel. This should be + * made configurable somehow; preferably, the clients (at least the + * ones using slave transfers) should be able to give us a hint. + */ +#define NR_DESCS_PER_CHANNEL 64 + +/* The set of bus widths supported by the DMA controller */ +#define DW_DMA_BUSWIDTHS \ + BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) + +/*----------------------------------------------------------------------*/ + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} + +static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc) +{ + return to_dw_desc(dwc->active_list.next); +} + +static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc) +{ + struct dw_desc *desc, *_desc; + struct dw_desc *ret = NULL; + unsigned int i = 0; + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + list_for_each_entry_safe(desc, _desc, &dwc->free_list, desc_node) { + i++; + if (async_tx_test_ack(&desc->txd)) { + list_del(&desc->desc_node); + ret = desc; + break; + } + dev_dbg(chan2dev(&dwc->chan), "desc %p not ACKed\n", desc); + } + spin_unlock_irqrestore(&dwc->lock, flags); + + dev_vdbg(chan2dev(&dwc->chan), "scanned %u descriptors on freelist\n", i); + + return ret; +} + +/* + * Move a descriptor, including any children, to the free list. + * `desc' must not be on any lists. + */ +static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc) +{ + unsigned long flags; + + if (desc) { + struct dw_desc *child; + + spin_lock_irqsave(&dwc->lock, flags); + list_for_each_entry(child, &desc->tx_list, desc_node) + dev_vdbg(chan2dev(&dwc->chan), + "moving child desc %p to freelist\n", + child); + list_splice_init(&desc->tx_list, &dwc->free_list); + dev_vdbg(chan2dev(&dwc->chan), "moving desc %p to freelist\n", desc); + list_add(&desc->desc_node, &dwc->free_list); + spin_unlock_irqrestore(&dwc->lock, flags); + } +} + +static void dwc_initialize(struct dw_dma_chan *dwc) +{ + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + struct dw_dma_slave *dws = dwc->chan.private; + u32 cfghi = DWC_CFGH_FIFO_MODE; + u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority); + + if (dwc->initialized == true) + return; + + if (dws) { + /* + * We need controller-specific data to set up slave + * transfers. + */ + BUG_ON(!dws->dma_dev || dws->dma_dev != dw->dma.dev); + + cfghi |= DWC_CFGH_DST_PER(dws->dst_id); + cfghi |= DWC_CFGH_SRC_PER(dws->src_id); + } else { + cfghi |= DWC_CFGH_DST_PER(dwc->dst_id); + cfghi |= DWC_CFGH_SRC_PER(dwc->src_id); + } + + channel_writel(dwc, CFG_LO, cfglo); + channel_writel(dwc, CFG_HI, cfghi); + + /* Enable interrupts */ + channel_set_bit(dw, MASK.XFER, dwc->mask); + channel_set_bit(dw, MASK.ERROR, dwc->mask); + + dwc->initialized = true; +} + +/*----------------------------------------------------------------------*/ + +static inline unsigned int dwc_fast_fls(unsigned long long v) +{ + /* + * We can be a lot more clever here, but this should take care + * of the most common optimization. + */ + if (!(v & 7)) + return 3; + else if (!(v & 3)) + return 2; + else if (!(v & 1)) + return 1; + return 0; +} + +static inline void dwc_dump_chan_regs(struct dw_dma_chan *dwc) +{ + dev_err(chan2dev(&dwc->chan), + " SAR: 0x%x DAR: 0x%x LLP: 0x%x CTL: 0x%x:%08x\n", + channel_readl(dwc, SAR), + channel_readl(dwc, DAR), + channel_readl(dwc, LLP), + channel_readl(dwc, CTL_HI), + channel_readl(dwc, CTL_LO)); +} + +static inline void dwc_chan_disable(struct dw_dma *dw, struct dw_dma_chan *dwc) +{ + channel_clear_bit(dw, CH_EN, dwc->mask); + while (dma_readl(dw, CH_EN) & dwc->mask) + cpu_relax(); +} + +/*----------------------------------------------------------------------*/ + +/* Perform single block transfer */ +static inline void dwc_do_single_block(struct dw_dma_chan *dwc, + struct dw_desc *desc) +{ + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + u32 ctllo; + + /* + * Software emulation of LLP mode relies on interrupts to continue + * multi block transfer. + */ + ctllo = desc->lli.ctllo | DWC_CTLL_INT_EN; + + channel_writel(dwc, SAR, desc->lli.sar); + channel_writel(dwc, DAR, desc->lli.dar); + channel_writel(dwc, CTL_LO, ctllo); + channel_writel(dwc, CTL_HI, desc->lli.ctlhi); + channel_set_bit(dw, CH_EN, dwc->mask); + + /* Move pointer to next descriptor */ + dwc->tx_node_active = dwc->tx_node_active->next; +} + +/* Called with dwc->lock held and bh disabled */ +static void dwc_dostart(struct dw_dma_chan *dwc, struct dw_desc *first) +{ + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + unsigned long was_soft_llp; + + /* ASSERT: channel is idle */ + if (dma_readl(dw, CH_EN) & dwc->mask) { + dev_err(chan2dev(&dwc->chan), + "%s: BUG: Attempted to start non-idle channel\n", + __func__); + dwc_dump_chan_regs(dwc); + + /* The tasklet will hopefully advance the queue... */ + return; + } + + if (dwc->nollp) { + was_soft_llp = test_and_set_bit(DW_DMA_IS_SOFT_LLP, + &dwc->flags); + if (was_soft_llp) { + dev_err(chan2dev(&dwc->chan), + "BUG: Attempted to start new LLP transfer inside ongoing one\n"); + return; + } + + dwc_initialize(dwc); + + dwc->residue = first->total_len; + dwc->tx_node_active = &first->tx_list; + + /* Submit first block */ + dwc_do_single_block(dwc, first); + + return; + } + + dwc_initialize(dwc); + + channel_writel(dwc, LLP, first->txd.phys); + channel_writel(dwc, CTL_LO, + DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); + channel_writel(dwc, CTL_HI, 0); + channel_set_bit(dw, CH_EN, dwc->mask); +} + +static void dwc_dostart_first_queued(struct dw_dma_chan *dwc) +{ + struct dw_desc *desc; + + if (list_empty(&dwc->queue)) + return; + + list_move(dwc->queue.next, &dwc->active_list); + desc = dwc_first_active(dwc); + dev_vdbg(chan2dev(&dwc->chan), "%s: started %u\n", __func__, desc->txd.cookie); + dwc_dostart(dwc, desc); +} + +/*----------------------------------------------------------------------*/ + +static void +dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc, + bool callback_required) +{ + dma_async_tx_callback callback = NULL; + void *param = NULL; + struct dma_async_tx_descriptor *txd = &desc->txd; + struct dw_desc *child; + unsigned long flags; + + dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie); + + spin_lock_irqsave(&dwc->lock, flags); + dma_cookie_complete(txd); + if (callback_required) { + callback = txd->callback; + param = txd->callback_param; + } + + /* async_tx_ack */ + list_for_each_entry(child, &desc->tx_list, desc_node) + async_tx_ack(&child->txd); + async_tx_ack(&desc->txd); + + list_splice_init(&desc->tx_list, &dwc->free_list); + list_move(&desc->desc_node, &dwc->free_list); + + dma_descriptor_unmap(txd); + spin_unlock_irqrestore(&dwc->lock, flags); + + if (callback) + callback(param); +} + +static void dwc_complete_all(struct dw_dma *dw, struct dw_dma_chan *dwc) +{ + struct dw_desc *desc, *_desc; + LIST_HEAD(list); + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + if (dma_readl(dw, CH_EN) & dwc->mask) { + dev_err(chan2dev(&dwc->chan), + "BUG: XFER bit set, but channel not idle!\n"); + + /* Try to continue after resetting the channel... */ + dwc_chan_disable(dw, dwc); + } + + /* + * Submit queued descriptors ASAP, i.e. before we go through + * the completed ones. + */ + list_splice_init(&dwc->active_list, &list); + dwc_dostart_first_queued(dwc); + + spin_unlock_irqrestore(&dwc->lock, flags); + + list_for_each_entry_safe(desc, _desc, &list, desc_node) + dwc_descriptor_complete(dwc, desc, true); +} + +/* Returns how many bytes were already received from source */ +static inline u32 dwc_get_sent(struct dw_dma_chan *dwc) +{ + u32 ctlhi = channel_readl(dwc, CTL_HI); + u32 ctllo = channel_readl(dwc, CTL_LO); + + return (ctlhi & DWC_CTLH_BLOCK_TS_MASK) * (1 << (ctllo >> 4 & 7)); +} + +static void dwc_scan_descriptors(struct dw_dma *dw, struct dw_dma_chan *dwc) +{ + dma_addr_t llp; + struct dw_desc *desc, *_desc; + struct dw_desc *child; + u32 status_xfer; + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + llp = channel_readl(dwc, LLP); + status_xfer = dma_readl(dw, RAW.XFER); + + if (status_xfer & dwc->mask) { + /* Everything we've submitted is done */ + dma_writel(dw, CLEAR.XFER, dwc->mask); + + if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) { + struct list_head *head, *active = dwc->tx_node_active; + + /* + * We are inside first active descriptor. + * Otherwise something is really wrong. + */ + desc = dwc_first_active(dwc); + + head = &desc->tx_list; + if (active != head) { + /* Update desc to reflect last sent one */ + if (active != head->next) + desc = to_dw_desc(active->prev); + + dwc->residue -= desc->len; + + child = to_dw_desc(active); + + /* Submit next block */ + dwc_do_single_block(dwc, child); + + spin_unlock_irqrestore(&dwc->lock, flags); + return; + } + + /* We are done here */ + clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags); + } + + dwc->residue = 0; + + spin_unlock_irqrestore(&dwc->lock, flags); + + dwc_complete_all(dw, dwc); + return; + } + + if (list_empty(&dwc->active_list)) { + dwc->residue = 0; + spin_unlock_irqrestore(&dwc->lock, flags); + return; + } + + if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) { + dev_vdbg(chan2dev(&dwc->chan), "%s: soft LLP mode\n", __func__); + spin_unlock_irqrestore(&dwc->lock, flags); + return; + } + + dev_vdbg(chan2dev(&dwc->chan), "%s: llp=%pad\n", __func__, &llp); + + list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) { + /* Initial residue value */ + dwc->residue = desc->total_len; + + /* Check first descriptors addr */ + if (desc->txd.phys == llp) { + spin_unlock_irqrestore(&dwc->lock, flags); + return; + } + + /* Check first descriptors llp */ + if (desc->lli.llp == llp) { + /* This one is currently in progress */ + dwc->residue -= dwc_get_sent(dwc); + spin_unlock_irqrestore(&dwc->lock, flags); + return; + } + + dwc->residue -= desc->len; + list_for_each_entry(child, &desc->tx_list, desc_node) { + if (child->lli.llp == llp) { + /* Currently in progress */ + dwc->residue -= dwc_get_sent(dwc); + spin_unlock_irqrestore(&dwc->lock, flags); + return; + } + dwc->residue -= child->len; + } + + /* + * No descriptors so far seem to be in progress, i.e. + * this one must be done. + */ + spin_unlock_irqrestore(&dwc->lock, flags); + dwc_descriptor_complete(dwc, desc, true); + spin_lock_irqsave(&dwc->lock, flags); + } + + dev_err(chan2dev(&dwc->chan), + "BUG: All descriptors done, but channel not idle!\n"); + + /* Try to continue after resetting the channel... */ + dwc_chan_disable(dw, dwc); + + dwc_dostart_first_queued(dwc); + spin_unlock_irqrestore(&dwc->lock, flags); +} + +static inline void dwc_dump_lli(struct dw_dma_chan *dwc, struct dw_lli *lli) +{ + dev_crit(chan2dev(&dwc->chan), " desc: s0x%x d0x%x l0x%x c0x%x:%x\n", + lli->sar, lli->dar, lli->llp, lli->ctlhi, lli->ctllo); +} + +static void dwc_handle_error(struct dw_dma *dw, struct dw_dma_chan *dwc) +{ + struct dw_desc *bad_desc; + struct dw_desc *child; + unsigned long flags; + + dwc_scan_descriptors(dw, dwc); + + spin_lock_irqsave(&dwc->lock, flags); + + /* + * The descriptor currently at the head of the active list is + * borked. Since we don't have any way to report errors, we'll + * just have to scream loudly and try to carry on. + */ + bad_desc = dwc_first_active(dwc); + list_del_init(&bad_desc->desc_node); + list_move(dwc->queue.next, dwc->active_list.prev); + + /* Clear the error flag and try to restart the controller */ + dma_writel(dw, CLEAR.ERROR, dwc->mask); + if (!list_empty(&dwc->active_list)) + dwc_dostart(dwc, dwc_first_active(dwc)); + + /* + * WARN may seem harsh, but since this only happens + * when someone submits a bad physical address in a + * descriptor, we should consider ourselves lucky that the + * controller flagged an error instead of scribbling over + * random memory locations. + */ + dev_WARN(chan2dev(&dwc->chan), "Bad descriptor submitted for DMA!\n" + " cookie: %d\n", bad_desc->txd.cookie); + dwc_dump_lli(dwc, &bad_desc->lli); + list_for_each_entry(child, &bad_desc->tx_list, desc_node) + dwc_dump_lli(dwc, &child->lli); + + spin_unlock_irqrestore(&dwc->lock, flags); + + /* Pretend the descriptor completed successfully */ + dwc_descriptor_complete(dwc, bad_desc, true); +} + +/* --------------------- Cyclic DMA API extensions -------------------- */ + +dma_addr_t dw_dma_get_src_addr(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + return channel_readl(dwc, SAR); +} +EXPORT_SYMBOL(dw_dma_get_src_addr); + +dma_addr_t dw_dma_get_dst_addr(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + return channel_readl(dwc, DAR); +} +EXPORT_SYMBOL(dw_dma_get_dst_addr); + +/* Called with dwc->lock held and all DMAC interrupts disabled */ +static void dwc_handle_cyclic(struct dw_dma *dw, struct dw_dma_chan *dwc, + u32 status_err, u32 status_xfer) +{ + unsigned long flags; + + if (dwc->mask) { + void (*callback)(void *param); + void *callback_param; + + dev_vdbg(chan2dev(&dwc->chan), "new cyclic period llp 0x%08x\n", + channel_readl(dwc, LLP)); + + callback = dwc->cdesc->period_callback; + callback_param = dwc->cdesc->period_callback_param; + + if (callback) + callback(callback_param); + } + + /* + * Error and transfer complete are highly unlikely, and will most + * likely be due to a configuration error by the user. + */ + if (unlikely(status_err & dwc->mask) || + unlikely(status_xfer & dwc->mask)) { + int i; + + dev_err(chan2dev(&dwc->chan), + "cyclic DMA unexpected %s interrupt, stopping DMA transfer\n", + status_xfer ? "xfer" : "error"); + + spin_lock_irqsave(&dwc->lock, flags); + + dwc_dump_chan_regs(dwc); + + dwc_chan_disable(dw, dwc); + + /* Make sure DMA does not restart by loading a new list */ + channel_writel(dwc, LLP, 0); + channel_writel(dwc, CTL_LO, 0); + channel_writel(dwc, CTL_HI, 0); + + dma_writel(dw, CLEAR.ERROR, dwc->mask); + dma_writel(dw, CLEAR.XFER, dwc->mask); + + for (i = 0; i < dwc->cdesc->periods; i++) + dwc_dump_lli(dwc, &dwc->cdesc->desc[i]->lli); + + spin_unlock_irqrestore(&dwc->lock, flags); + } +} + +/* ------------------------------------------------------------------------- */ + +static void dw_dma_tasklet(unsigned long data) +{ + struct dw_dma *dw = (struct dw_dma *)data; + struct dw_dma_chan *dwc; + u32 status_xfer; + u32 status_err; + int i; + + status_xfer = dma_readl(dw, RAW.XFER); + status_err = dma_readl(dw, RAW.ERROR); + + dev_vdbg(dw->dma.dev, "%s: status_err=%x\n", __func__, status_err); + + for (i = 0; i < dw->dma.chancnt; i++) { + dwc = &dw->chan[i]; + if (test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) + dwc_handle_cyclic(dw, dwc, status_err, status_xfer); + else if (status_err & (1 << i)) + dwc_handle_error(dw, dwc); + else if (status_xfer & (1 << i)) + dwc_scan_descriptors(dw, dwc); + } + + /* + * Re-enable interrupts. + */ + channel_set_bit(dw, MASK.XFER, dw->all_chan_mask); + channel_set_bit(dw, MASK.ERROR, dw->all_chan_mask); +} + +static irqreturn_t dw_dma_interrupt(int irq, void *dev_id) +{ + struct dw_dma *dw = dev_id; + u32 status = dma_readl(dw, STATUS_INT); + + dev_vdbg(dw->dma.dev, "%s: status=0x%x\n", __func__, status); + + /* Check if we have any interrupt from the DMAC */ + if (!status || !dw->in_use) + return IRQ_NONE; + + /* + * Just disable the interrupts. We'll turn them back on in the + * softirq handler. + */ + channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); + channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); + + status = dma_readl(dw, STATUS_INT); + if (status) { + dev_err(dw->dma.dev, + "BUG: Unexpected interrupts pending: 0x%x\n", + status); + + /* Try to recover */ + channel_clear_bit(dw, MASK.XFER, (1 << 8) - 1); + channel_clear_bit(dw, MASK.SRC_TRAN, (1 << 8) - 1); + channel_clear_bit(dw, MASK.DST_TRAN, (1 << 8) - 1); + channel_clear_bit(dw, MASK.ERROR, (1 << 8) - 1); + } + + tasklet_schedule(&dw->tasklet); + + return IRQ_HANDLED; +} + +/*----------------------------------------------------------------------*/ + +static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct dw_desc *desc = txd_to_dw_desc(tx); + struct dw_dma_chan *dwc = to_dw_dma_chan(tx->chan); + dma_cookie_t cookie; + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + cookie = dma_cookie_assign(tx); + + /* + * REVISIT: We should attempt to chain as many descriptors as + * possible, perhaps even appending to those already submitted + * for DMA. But this is hard to do in a race-free manner. + */ + + dev_vdbg(chan2dev(tx->chan), "%s: queued %u\n", __func__, desc->txd.cookie); + list_add_tail(&desc->desc_node, &dwc->queue); + + spin_unlock_irqrestore(&dwc->lock, flags); + + return cookie; +} + +static struct dma_async_tx_descriptor * +dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(chan->device); + struct dw_desc *desc; + struct dw_desc *first; + struct dw_desc *prev; + size_t xfer_count; + size_t offset; + unsigned int src_width; + unsigned int dst_width; + unsigned int data_width; + u32 ctllo; + + dev_vdbg(chan2dev(chan), + "%s: d%pad s%pad l0x%zx f0x%lx\n", __func__, + &dest, &src, len, flags); + + if (unlikely(!len)) { + dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__); + return NULL; + } + + dwc->direction = DMA_MEM_TO_MEM; + + data_width = min_t(unsigned int, dw->data_width[dwc->src_master], + dw->data_width[dwc->dst_master]); + + src_width = dst_width = min_t(unsigned int, data_width, + dwc_fast_fls(src | dest | len)); + + ctllo = DWC_DEFAULT_CTLLO(chan) + | DWC_CTLL_DST_WIDTH(dst_width) + | DWC_CTLL_SRC_WIDTH(src_width) + | DWC_CTLL_DST_INC + | DWC_CTLL_SRC_INC + | DWC_CTLL_FC_M2M; + prev = first = NULL; + + for (offset = 0; offset < len; offset += xfer_count << src_width) { + xfer_count = min_t(size_t, (len - offset) >> src_width, + dwc->block_size); + + desc = dwc_desc_get(dwc); + if (!desc) + goto err_desc_get; + + desc->lli.sar = src + offset; + desc->lli.dar = dest + offset; + desc->lli.ctllo = ctllo; + desc->lli.ctlhi = xfer_count; + desc->len = xfer_count << src_width; + + if (!first) { + first = desc; + } else { + prev->lli.llp = desc->txd.phys; + list_add_tail(&desc->desc_node, + &first->tx_list); + } + prev = desc; + } + + if (flags & DMA_PREP_INTERRUPT) + /* Trigger interrupt after last block */ + prev->lli.ctllo |= DWC_CTLL_INT_EN; + + prev->lli.llp = 0; + first->txd.flags = flags; + first->total_len = len; + + return &first->txd; + +err_desc_get: + dwc_desc_put(dwc, first); + return NULL; +} + +static struct dma_async_tx_descriptor * +dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(chan->device); + struct dma_slave_config *sconfig = &dwc->dma_sconfig; + struct dw_desc *prev; + struct dw_desc *first; + u32 ctllo; + dma_addr_t reg; + unsigned int reg_width; + unsigned int mem_width; + unsigned int data_width; + unsigned int i; + struct scatterlist *sg; + size_t total_len = 0; + + dev_vdbg(chan2dev(chan), "%s\n", __func__); + + if (unlikely(!is_slave_direction(direction) || !sg_len)) + return NULL; + + dwc->direction = direction; + + prev = first = NULL; + + switch (direction) { + case DMA_MEM_TO_DEV: + reg_width = __fls(sconfig->dst_addr_width); + reg = sconfig->dst_addr; + ctllo = (DWC_DEFAULT_CTLLO(chan) + | DWC_CTLL_DST_WIDTH(reg_width) + | DWC_CTLL_DST_FIX + | DWC_CTLL_SRC_INC); + + ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_M2P) : + DWC_CTLL_FC(DW_DMA_FC_D_M2P); + + data_width = dw->data_width[dwc->src_master]; + + for_each_sg(sgl, sg, sg_len, i) { + struct dw_desc *desc; + u32 len, dlen, mem; + + mem = sg_dma_address(sg); + len = sg_dma_len(sg); + + mem_width = min_t(unsigned int, + data_width, dwc_fast_fls(mem | len)); + +slave_sg_todev_fill_desc: + desc = dwc_desc_get(dwc); + if (!desc) + goto err_desc_get; + + desc->lli.sar = mem; + desc->lli.dar = reg; + desc->lli.ctllo = ctllo | DWC_CTLL_SRC_WIDTH(mem_width); + if ((len >> mem_width) > dwc->block_size) { + dlen = dwc->block_size << mem_width; + mem += dlen; + len -= dlen; + } else { + dlen = len; + len = 0; + } + + desc->lli.ctlhi = dlen >> mem_width; + desc->len = dlen; + + if (!first) { + first = desc; + } else { + prev->lli.llp = desc->txd.phys; + list_add_tail(&desc->desc_node, + &first->tx_list); + } + prev = desc; + total_len += dlen; + + if (len) + goto slave_sg_todev_fill_desc; + } + break; + case DMA_DEV_TO_MEM: + reg_width = __fls(sconfig->src_addr_width); + reg = sconfig->src_addr; + ctllo = (DWC_DEFAULT_CTLLO(chan) + | DWC_CTLL_SRC_WIDTH(reg_width) + | DWC_CTLL_DST_INC + | DWC_CTLL_SRC_FIX); + + ctllo |= sconfig->device_fc ? DWC_CTLL_FC(DW_DMA_FC_P_P2M) : + DWC_CTLL_FC(DW_DMA_FC_D_P2M); + + data_width = dw->data_width[dwc->dst_master]; + + for_each_sg(sgl, sg, sg_len, i) { + struct dw_desc *desc; + u32 len, dlen, mem; + + mem = sg_dma_address(sg); + len = sg_dma_len(sg); + + mem_width = min_t(unsigned int, + data_width, dwc_fast_fls(mem | len)); + +slave_sg_fromdev_fill_desc: + desc = dwc_desc_get(dwc); + if (!desc) + goto err_desc_get; + + desc->lli.sar = reg; + desc->lli.dar = mem; + desc->lli.ctllo = ctllo | DWC_CTLL_DST_WIDTH(mem_width); + if ((len >> reg_width) > dwc->block_size) { + dlen = dwc->block_size << reg_width; + mem += dlen; + len -= dlen; + } else { + dlen = len; + len = 0; + } + desc->lli.ctlhi = dlen >> reg_width; + desc->len = dlen; + + if (!first) { + first = desc; + } else { + prev->lli.llp = desc->txd.phys; + list_add_tail(&desc->desc_node, + &first->tx_list); + } + prev = desc; + total_len += dlen; + + if (len) + goto slave_sg_fromdev_fill_desc; + } + break; + default: + return NULL; + } + + if (flags & DMA_PREP_INTERRUPT) + /* Trigger interrupt after last block */ + prev->lli.ctllo |= DWC_CTLL_INT_EN; + + prev->lli.llp = 0; + first->total_len = total_len; + + return &first->txd; + +err_desc_get: + dev_err(chan2dev(chan), + "not enough descriptors available. Direction %d\n", direction); + dwc_desc_put(dwc, first); + return NULL; +} + +bool dw_dma_filter(struct dma_chan *chan, void *param) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma_slave *dws = param; + + if (!dws || dws->dma_dev != chan->device->dev) + return false; + + /* We have to copy data since dws can be temporary storage */ + + dwc->src_id = dws->src_id; + dwc->dst_id = dws->dst_id; + + dwc->src_master = dws->src_master; + dwc->dst_master = dws->dst_master; + + return true; +} +EXPORT_SYMBOL_GPL(dw_dma_filter); + +/* + * Fix sconfig's burst size according to dw_dmac. We need to convert them as: + * 1 -> 0, 4 -> 1, 8 -> 2, 16 -> 3. + * + * NOTE: burst size 2 is not supported by controller. + * + * This can be done by finding least significant bit set: n & (n - 1) + */ +static inline void convert_burst(u32 *maxburst) +{ + if (*maxburst > 1) + *maxburst = fls(*maxburst) - 2; + else + *maxburst = 0; +} + +static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + + /* Check if chan will be configured for slave transfers */ + if (!is_slave_direction(sconfig->direction)) + return -EINVAL; + + memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig)); + dwc->direction = sconfig->direction; + + convert_burst(&dwc->dma_sconfig.src_maxburst); + convert_burst(&dwc->dma_sconfig.dst_maxburst); + + return 0; +} + +static int dwc_pause(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + unsigned long flags; + unsigned int count = 20; /* timeout iterations */ + u32 cfglo; + + spin_lock_irqsave(&dwc->lock, flags); + + cfglo = channel_readl(dwc, CFG_LO); + channel_writel(dwc, CFG_LO, cfglo | DWC_CFGL_CH_SUSP); + while (!(channel_readl(dwc, CFG_LO) & DWC_CFGL_FIFO_EMPTY) && count--) + udelay(2); + + dwc->paused = true; + + spin_unlock_irqrestore(&dwc->lock, flags); + + return 0; +} + +static inline void dwc_chan_resume(struct dw_dma_chan *dwc) +{ + u32 cfglo = channel_readl(dwc, CFG_LO); + + channel_writel(dwc, CFG_LO, cfglo & ~DWC_CFGL_CH_SUSP); + + dwc->paused = false; +} + +static int dwc_resume(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + unsigned long flags; + + if (!dwc->paused) + return 0; + + spin_lock_irqsave(&dwc->lock, flags); + + dwc_chan_resume(dwc); + + spin_unlock_irqrestore(&dwc->lock, flags); + + return 0; +} + +static int dwc_terminate_all(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(chan->device); + struct dw_desc *desc, *_desc; + unsigned long flags; + LIST_HEAD(list); + + spin_lock_irqsave(&dwc->lock, flags); + + clear_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags); + + dwc_chan_disable(dw, dwc); + + dwc_chan_resume(dwc); + + /* active_list entries will end up before queued entries */ + list_splice_init(&dwc->queue, &list); + list_splice_init(&dwc->active_list, &list); + + spin_unlock_irqrestore(&dwc->lock, flags); + + /* Flush all pending and queued descriptors */ + list_for_each_entry_safe(desc, _desc, &list, desc_node) + dwc_descriptor_complete(dwc, desc, false); + + return 0; +} + +static inline u32 dwc_get_residue(struct dw_dma_chan *dwc) +{ + unsigned long flags; + u32 residue; + + spin_lock_irqsave(&dwc->lock, flags); + + residue = dwc->residue; + if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags) && residue) + residue -= dwc_get_sent(dwc); + + spin_unlock_irqrestore(&dwc->lock, flags); + return residue; +} + +static enum dma_status +dwc_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + enum dma_status ret; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + dwc_scan_descriptors(to_dw_dma(chan->device), dwc); + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret != DMA_COMPLETE) + dma_set_residue(txstate, dwc_get_residue(dwc)); + + if (dwc->paused && ret == DMA_IN_PROGRESS) + return DMA_PAUSED; + + return ret; +} + +static void dwc_issue_pending(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + if (list_empty(&dwc->active_list)) + dwc_dostart_first_queued(dwc); + spin_unlock_irqrestore(&dwc->lock, flags); +} + +/*----------------------------------------------------------------------*/ + +static void dw_dma_off(struct dw_dma *dw) +{ + int i; + + dma_writel(dw, CFG, 0); + + channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask); + channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask); + channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask); + channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask); + + while (dma_readl(dw, CFG) & DW_CFG_DMA_EN) + cpu_relax(); + + for (i = 0; i < dw->dma.chancnt; i++) + dw->chan[i].initialized = false; +} + +static void dw_dma_on(struct dw_dma *dw) +{ + dma_writel(dw, CFG, DW_CFG_DMA_EN); +} + +static int dwc_alloc_chan_resources(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(chan->device); + struct dw_desc *desc; + int i; + unsigned long flags; + + dev_vdbg(chan2dev(chan), "%s\n", __func__); + + /* ASSERT: channel is idle */ + if (dma_readl(dw, CH_EN) & dwc->mask) { + dev_dbg(chan2dev(chan), "DMA channel not idle?\n"); + return -EIO; + } + + dma_cookie_init(chan); + + /* + * NOTE: some controllers may have additional features that we + * need to initialize here, like "scatter-gather" (which + * doesn't mean what you think it means), and status writeback. + */ + + /* Enable controller here if needed */ + if (!dw->in_use) + dw_dma_on(dw); + dw->in_use |= dwc->mask; + + spin_lock_irqsave(&dwc->lock, flags); + i = dwc->descs_allocated; + while (dwc->descs_allocated < NR_DESCS_PER_CHANNEL) { + dma_addr_t phys; + + spin_unlock_irqrestore(&dwc->lock, flags); + + desc = dma_pool_alloc(dw->desc_pool, GFP_ATOMIC, &phys); + if (!desc) + goto err_desc_alloc; + + memset(desc, 0, sizeof(struct dw_desc)); + + INIT_LIST_HEAD(&desc->tx_list); + dma_async_tx_descriptor_init(&desc->txd, chan); + desc->txd.tx_submit = dwc_tx_submit; + desc->txd.flags = DMA_CTRL_ACK; + desc->txd.phys = phys; + + dwc_desc_put(dwc, desc); + + spin_lock_irqsave(&dwc->lock, flags); + i = ++dwc->descs_allocated; + } + + spin_unlock_irqrestore(&dwc->lock, flags); + + dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i); + + return i; + +err_desc_alloc: + dev_info(chan2dev(chan), "only allocated %d descriptors\n", i); + + return i; +} + +static void dwc_free_chan_resources(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(chan->device); + struct dw_desc *desc, *_desc; + unsigned long flags; + LIST_HEAD(list); + + dev_dbg(chan2dev(chan), "%s: descs allocated=%u\n", __func__, + dwc->descs_allocated); + + /* ASSERT: channel is idle */ + BUG_ON(!list_empty(&dwc->active_list)); + BUG_ON(!list_empty(&dwc->queue)); + BUG_ON(dma_readl(to_dw_dma(chan->device), CH_EN) & dwc->mask); + + spin_lock_irqsave(&dwc->lock, flags); + list_splice_init(&dwc->free_list, &list); + dwc->descs_allocated = 0; + dwc->initialized = false; + + /* Disable interrupts */ + channel_clear_bit(dw, MASK.XFER, dwc->mask); + channel_clear_bit(dw, MASK.ERROR, dwc->mask); + + spin_unlock_irqrestore(&dwc->lock, flags); + + /* Disable controller in case it was a last user */ + dw->in_use &= ~dwc->mask; + if (!dw->in_use) + dw_dma_off(dw); + + list_for_each_entry_safe(desc, _desc, &list, desc_node) { + dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); + dma_pool_free(dw->desc_pool, desc, desc->txd.phys); + } + + dev_vdbg(chan2dev(chan), "%s: done\n", __func__); +} + +/* --------------------- Cyclic DMA API extensions -------------------- */ + +/** + * dw_dma_cyclic_start - start the cyclic DMA transfer + * @chan: the DMA channel to start + * + * Must be called with soft interrupts disabled. Returns zero on success or + * -errno on failure. + */ +int dw_dma_cyclic_start(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + unsigned long flags; + + if (!test_bit(DW_DMA_IS_CYCLIC, &dwc->flags)) { + dev_err(chan2dev(&dwc->chan), "missing prep for cyclic DMA\n"); + return -ENODEV; + } + + spin_lock_irqsave(&dwc->lock, flags); + + /* Assert channel is idle */ + if (dma_readl(dw, CH_EN) & dwc->mask) { + dev_err(chan2dev(&dwc->chan), + "%s: BUG: Attempted to start non-idle channel\n", + __func__); + dwc_dump_chan_regs(dwc); + spin_unlock_irqrestore(&dwc->lock, flags); + return -EBUSY; + } + + dma_writel(dw, CLEAR.ERROR, dwc->mask); + dma_writel(dw, CLEAR.XFER, dwc->mask); + + /* Setup DMAC channel registers */ + channel_writel(dwc, LLP, dwc->cdesc->desc[0]->txd.phys); + channel_writel(dwc, CTL_LO, DWC_CTLL_LLP_D_EN | DWC_CTLL_LLP_S_EN); + channel_writel(dwc, CTL_HI, 0); + + channel_set_bit(dw, CH_EN, dwc->mask); + + spin_unlock_irqrestore(&dwc->lock, flags); + + return 0; +} +EXPORT_SYMBOL(dw_dma_cyclic_start); + +/** + * dw_dma_cyclic_stop - stop the cyclic DMA transfer + * @chan: the DMA channel to stop + * + * Must be called with soft interrupts disabled. + */ +void dw_dma_cyclic_stop(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + + dwc_chan_disable(dw, dwc); + + spin_unlock_irqrestore(&dwc->lock, flags); +} +EXPORT_SYMBOL(dw_dma_cyclic_stop); + +/** + * dw_dma_cyclic_prep - prepare the cyclic DMA transfer + * @chan: the DMA channel to prepare + * @buf_addr: physical DMA address where the buffer starts + * @buf_len: total number of bytes for the entire buffer + * @period_len: number of bytes for each period + * @direction: transfer direction, to or from device + * + * Must be called before trying to start the transfer. Returns a valid struct + * dw_cyclic_desc if successful or an ERR_PTR(-errno) if not successful. + */ +struct dw_cyclic_desc *dw_dma_cyclic_prep(struct dma_chan *chan, + dma_addr_t buf_addr, size_t buf_len, size_t period_len, + enum dma_transfer_direction direction) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dma_slave_config *sconfig = &dwc->dma_sconfig; + struct dw_cyclic_desc *cdesc; + struct dw_cyclic_desc *retval = NULL; + struct dw_desc *desc; + struct dw_desc *last = NULL; + unsigned long was_cyclic; + unsigned int reg_width; + unsigned int periods; + unsigned int i; + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + if (dwc->nollp) { + spin_unlock_irqrestore(&dwc->lock, flags); + dev_dbg(chan2dev(&dwc->chan), + "channel doesn't support LLP transfers\n"); + return ERR_PTR(-EINVAL); + } + + if (!list_empty(&dwc->queue) || !list_empty(&dwc->active_list)) { + spin_unlock_irqrestore(&dwc->lock, flags); + dev_dbg(chan2dev(&dwc->chan), + "queue and/or active list are not empty\n"); + return ERR_PTR(-EBUSY); + } + + was_cyclic = test_and_set_bit(DW_DMA_IS_CYCLIC, &dwc->flags); + spin_unlock_irqrestore(&dwc->lock, flags); + if (was_cyclic) { + dev_dbg(chan2dev(&dwc->chan), + "channel already prepared for cyclic DMA\n"); + return ERR_PTR(-EBUSY); + } + + retval = ERR_PTR(-EINVAL); + + if (unlikely(!is_slave_direction(direction))) + goto out_err; + + dwc->direction = direction; + + if (direction == DMA_MEM_TO_DEV) + reg_width = __ffs(sconfig->dst_addr_width); + else + reg_width = __ffs(sconfig->src_addr_width); + + periods = buf_len / period_len; + + /* Check for too big/unaligned periods and unaligned DMA buffer. */ + if (period_len > (dwc->block_size << reg_width)) + goto out_err; + if (unlikely(period_len & ((1 << reg_width) - 1))) + goto out_err; + if (unlikely(buf_addr & ((1 << reg_width) - 1))) + goto out_err; + + retval = ERR_PTR(-ENOMEM); + + if (periods > NR_DESCS_PER_CHANNEL) + goto out_err; + + cdesc = kzalloc(sizeof(struct dw_cyclic_desc), GFP_KERNEL); + if (!cdesc) + goto out_err; + + cdesc->desc = kzalloc(sizeof(struct dw_desc *) * periods, GFP_KERNEL); + if (!cdesc->desc) + goto out_err_alloc; + + for (i = 0; i < periods; i++) { + desc = dwc_desc_get(dwc); + if (!desc) + goto out_err_desc_get; + + switch (direction) { + case DMA_MEM_TO_DEV: + desc->lli.dar = sconfig->dst_addr; + desc->lli.sar = buf_addr + (period_len * i); + desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan) + | DWC_CTLL_DST_WIDTH(reg_width) + | DWC_CTLL_SRC_WIDTH(reg_width) + | DWC_CTLL_DST_FIX + | DWC_CTLL_SRC_INC + | DWC_CTLL_INT_EN); + + desc->lli.ctllo |= sconfig->device_fc ? + DWC_CTLL_FC(DW_DMA_FC_P_M2P) : + DWC_CTLL_FC(DW_DMA_FC_D_M2P); + + break; + case DMA_DEV_TO_MEM: + desc->lli.dar = buf_addr + (period_len * i); + desc->lli.sar = sconfig->src_addr; + desc->lli.ctllo = (DWC_DEFAULT_CTLLO(chan) + | DWC_CTLL_SRC_WIDTH(reg_width) + | DWC_CTLL_DST_WIDTH(reg_width) + | DWC_CTLL_DST_INC + | DWC_CTLL_SRC_FIX + | DWC_CTLL_INT_EN); + + desc->lli.ctllo |= sconfig->device_fc ? + DWC_CTLL_FC(DW_DMA_FC_P_P2M) : + DWC_CTLL_FC(DW_DMA_FC_D_P2M); + + break; + default: + break; + } + + desc->lli.ctlhi = (period_len >> reg_width); + cdesc->desc[i] = desc; + + if (last) + last->lli.llp = desc->txd.phys; + + last = desc; + } + + /* Let's make a cyclic list */ + last->lli.llp = cdesc->desc[0]->txd.phys; + + dev_dbg(chan2dev(&dwc->chan), + "cyclic prepared buf %pad len %zu period %zu periods %d\n", + &buf_addr, buf_len, period_len, periods); + + cdesc->periods = periods; + dwc->cdesc = cdesc; + + return cdesc; + +out_err_desc_get: + while (i--) + dwc_desc_put(dwc, cdesc->desc[i]); +out_err_alloc: + kfree(cdesc); +out_err: + clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); + return (struct dw_cyclic_desc *)retval; +} +EXPORT_SYMBOL(dw_dma_cyclic_prep); + +/** + * dw_dma_cyclic_free - free a prepared cyclic DMA transfer + * @chan: the DMA channel to free + */ +void dw_dma_cyclic_free(struct dma_chan *chan) +{ + struct dw_dma_chan *dwc = to_dw_dma_chan(chan); + struct dw_dma *dw = to_dw_dma(dwc->chan.device); + struct dw_cyclic_desc *cdesc = dwc->cdesc; + int i; + unsigned long flags; + + dev_dbg(chan2dev(&dwc->chan), "%s\n", __func__); + + if (!cdesc) + return; + + spin_lock_irqsave(&dwc->lock, flags); + + dwc_chan_disable(dw, dwc); + + dma_writel(dw, CLEAR.ERROR, dwc->mask); + dma_writel(dw, CLEAR.XFER, dwc->mask); + + spin_unlock_irqrestore(&dwc->lock, flags); + + for (i = 0; i < cdesc->periods; i++) + dwc_desc_put(dwc, cdesc->desc[i]); + + kfree(cdesc->desc); + kfree(cdesc); + + clear_bit(DW_DMA_IS_CYCLIC, &dwc->flags); +} +EXPORT_SYMBOL(dw_dma_cyclic_free); + +/*----------------------------------------------------------------------*/ + +int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata) +{ + struct dw_dma *dw; + bool autocfg; + unsigned int dw_params; + unsigned int nr_channels; + unsigned int max_blk_size = 0; + int err; + int i; + + dw = devm_kzalloc(chip->dev, sizeof(*dw), GFP_KERNEL); + if (!dw) + return -ENOMEM; + + dw->regs = chip->regs; + chip->dw = dw; + + pm_runtime_get_sync(chip->dev); + + dw_params = dma_read_byaddr(chip->regs, DW_PARAMS); + autocfg = dw_params >> DW_PARAMS_EN & 0x1; + + dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n", dw_params); + + if (!pdata && autocfg) { + pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + err = -ENOMEM; + goto err_pdata; + } + + /* Fill platform data with the default values */ + pdata->is_private = true; + pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING; + pdata->chan_priority = CHAN_PRIORITY_ASCENDING; + } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) { + err = -EINVAL; + goto err_pdata; + } + + if (autocfg) + nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1; + else + nr_channels = pdata->nr_channels; + + dw->chan = devm_kcalloc(chip->dev, nr_channels, sizeof(*dw->chan), + GFP_KERNEL); + if (!dw->chan) { + err = -ENOMEM; + goto err_pdata; + } + + /* Get hardware configuration parameters */ + if (autocfg) { + max_blk_size = dma_readl(dw, MAX_BLK_SIZE); + + dw->nr_masters = (dw_params >> DW_PARAMS_NR_MASTER & 3) + 1; + for (i = 0; i < dw->nr_masters; i++) { + dw->data_width[i] = + (dw_params >> DW_PARAMS_DATA_WIDTH(i) & 3) + 2; + } + } else { + dw->nr_masters = pdata->nr_masters; + for (i = 0; i < dw->nr_masters; i++) + dw->data_width[i] = pdata->data_width[i]; + } + + /* Calculate all channel mask before DMA setup */ + dw->all_chan_mask = (1 << nr_channels) - 1; + + /* Force dma off, just in case */ + dw_dma_off(dw); + + /* Disable BLOCK interrupts as well */ + channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask); + + /* Create a pool of consistent memory blocks for hardware descriptors */ + dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", chip->dev, + sizeof(struct dw_desc), 4, 0); + if (!dw->desc_pool) { + dev_err(chip->dev, "No memory for descriptors dma pool\n"); + err = -ENOMEM; + goto err_pdata; + } + + tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw); + + err = request_irq(chip->irq, dw_dma_interrupt, IRQF_SHARED, + "dw_dmac", dw); + if (err) + goto err_pdata; + + INIT_LIST_HEAD(&dw->dma.channels); + for (i = 0; i < nr_channels; i++) { + struct dw_dma_chan *dwc = &dw->chan[i]; + int r = nr_channels - i - 1; + + dwc->chan.device = &dw->dma; + dma_cookie_init(&dwc->chan); + if (pdata->chan_allocation_order == CHAN_ALLOCATION_ASCENDING) + list_add_tail(&dwc->chan.device_node, + &dw->dma.channels); + else + list_add(&dwc->chan.device_node, &dw->dma.channels); + + /* 7 is highest priority & 0 is lowest. */ + if (pdata->chan_priority == CHAN_PRIORITY_ASCENDING) + dwc->priority = r; + else + dwc->priority = i; + + dwc->ch_regs = &__dw_regs(dw)->CHAN[i]; + spin_lock_init(&dwc->lock); + dwc->mask = 1 << i; + + INIT_LIST_HEAD(&dwc->active_list); + INIT_LIST_HEAD(&dwc->queue); + INIT_LIST_HEAD(&dwc->free_list); + + channel_clear_bit(dw, CH_EN, dwc->mask); + + dwc->direction = DMA_TRANS_NONE; + + /* Hardware configuration */ + if (autocfg) { + unsigned int dwc_params; + void __iomem *addr = chip->regs + r * sizeof(u32); + + dwc_params = dma_read_byaddr(addr, DWC_PARAMS); + + dev_dbg(chip->dev, "DWC_PARAMS[%d]: 0x%08x\n", i, + dwc_params); + + /* + * Decode maximum block size for given channel. The + * stored 4 bit value represents blocks from 0x00 for 3 + * up to 0x0a for 4095. + */ + dwc->block_size = + (4 << ((max_blk_size >> 4 * i) & 0xf)) - 1; + dwc->nollp = + (dwc_params >> DWC_PARAMS_MBLK_EN & 0x1) == 0; + } else { + dwc->block_size = pdata->block_size; + + /* Check if channel supports multi block transfer */ + channel_writel(dwc, LLP, 0xfffffffc); + dwc->nollp = + (channel_readl(dwc, LLP) & 0xfffffffc) == 0; + channel_writel(dwc, LLP, 0); + } + } + + /* Clear all interrupts on all channels. */ + dma_writel(dw, CLEAR.XFER, dw->all_chan_mask); + dma_writel(dw, CLEAR.BLOCK, dw->all_chan_mask); + dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask); + dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask); + dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask); + + dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask); + dma_cap_set(DMA_SLAVE, dw->dma.cap_mask); + if (pdata->is_private) + dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask); + dw->dma.dev = chip->dev; + dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources; + dw->dma.device_free_chan_resources = dwc_free_chan_resources; + + dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy; + dw->dma.device_prep_slave_sg = dwc_prep_slave_sg; + + dw->dma.device_config = dwc_config; + dw->dma.device_pause = dwc_pause; + dw->dma.device_resume = dwc_resume; + dw->dma.device_terminate_all = dwc_terminate_all; + + dw->dma.device_tx_status = dwc_tx_status; + dw->dma.device_issue_pending = dwc_issue_pending; + + /* DMA capabilities */ + dw->dma.src_addr_widths = DW_DMA_BUSWIDTHS; + dw->dma.dst_addr_widths = DW_DMA_BUSWIDTHS; + dw->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) | + BIT(DMA_MEM_TO_MEM); + dw->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + err = dma_async_device_register(&dw->dma); + if (err) + goto err_dma_register; + + dev_info(chip->dev, "DesignWare DMA Controller, %d channels\n", + nr_channels); + + pm_runtime_put_sync_suspend(chip->dev); + + return 0; + +err_dma_register: + free_irq(chip->irq, dw); +err_pdata: + pm_runtime_put_sync_suspend(chip->dev); + return err; +} +EXPORT_SYMBOL_GPL(dw_dma_probe); + +int dw_dma_remove(struct dw_dma_chip *chip) +{ + struct dw_dma *dw = chip->dw; + struct dw_dma_chan *dwc, *_dwc; + + pm_runtime_get_sync(chip->dev); + + dw_dma_off(dw); + dma_async_device_unregister(&dw->dma); + + free_irq(chip->irq, dw); + tasklet_kill(&dw->tasklet); + + list_for_each_entry_safe(dwc, _dwc, &dw->dma.channels, + chan.device_node) { + list_del(&dwc->chan.device_node); + channel_clear_bit(dw, CH_EN, dwc->mask); + } + + pm_runtime_put_sync_suspend(chip->dev); + return 0; +} +EXPORT_SYMBOL_GPL(dw_dma_remove); + +int dw_dma_disable(struct dw_dma_chip *chip) +{ + struct dw_dma *dw = chip->dw; + + dw_dma_off(dw); + return 0; +} +EXPORT_SYMBOL_GPL(dw_dma_disable); + +int dw_dma_enable(struct dw_dma_chip *chip) +{ + struct dw_dma *dw = chip->dw; + + dw_dma_on(dw); + return 0; +} +EXPORT_SYMBOL_GPL(dw_dma_enable); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller core driver"); +MODULE_AUTHOR("Haavard Skinnemoen (Atmel)"); +MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>"); diff --git a/drivers/dma/dw/internal.h b/drivers/dma/dw/internal.h new file mode 100644 index 000000000..41439732f --- /dev/null +++ b/drivers/dma/dw/internal.h @@ -0,0 +1,23 @@ +/* + * Driver for the Synopsys DesignWare DMA Controller + * + * Copyright (C) 2013 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _DMA_DW_INTERNAL_H +#define _DMA_DW_INTERNAL_H + +#include <linux/dma/dw.h> + +#include "regs.h" + +int dw_dma_disable(struct dw_dma_chip *chip); +int dw_dma_enable(struct dw_dma_chip *chip); + +extern bool dw_dma_filter(struct dma_chan *chan, void *param); + +#endif /* _DMA_DW_INTERNAL_H */ diff --git a/drivers/dma/dw/pci.c b/drivers/dma/dw/pci.c new file mode 100644 index 000000000..b144706b3 --- /dev/null +++ b/drivers/dma/dw/pci.c @@ -0,0 +1,135 @@ +/* + * PCI driver for the Synopsys DesignWare DMA Controller + * + * Copyright (C) 2013 Intel Corporation + * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/device.h> + +#include "internal.h" + +static struct dw_dma_platform_data dw_pci_pdata = { + .is_private = 1, + .chan_allocation_order = CHAN_ALLOCATION_ASCENDING, + .chan_priority = CHAN_PRIORITY_ASCENDING, +}; + +static int dw_pci_probe(struct pci_dev *pdev, const struct pci_device_id *pid) +{ + struct dw_dma_chip *chip; + struct dw_dma_platform_data *pdata = (void *)pid->driver_data; + int ret; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev)); + if (ret) { + dev_err(&pdev->dev, "I/O memory remapping failed\n"); + return ret; + } + + pci_set_master(pdev); + pci_try_set_mwi(pdev); + + ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = &pdev->dev; + chip->regs = pcim_iomap_table(pdev)[0]; + chip->irq = pdev->irq; + + ret = dw_dma_probe(chip, pdata); + if (ret) + return ret; + + pci_set_drvdata(pdev, chip); + + return 0; +} + +static void dw_pci_remove(struct pci_dev *pdev) +{ + struct dw_dma_chip *chip = pci_get_drvdata(pdev); + int ret; + + ret = dw_dma_remove(chip); + if (ret) + dev_warn(&pdev->dev, "can't remove device properly: %d\n", ret); +} + +#ifdef CONFIG_PM_SLEEP + +static int dw_pci_suspend_late(struct device *dev) +{ + struct pci_dev *pci = to_pci_dev(dev); + struct dw_dma_chip *chip = pci_get_drvdata(pci); + + return dw_dma_disable(chip); +}; + +static int dw_pci_resume_early(struct device *dev) +{ + struct pci_dev *pci = to_pci_dev(dev); + struct dw_dma_chip *chip = pci_get_drvdata(pci); + + return dw_dma_enable(chip); +}; + +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops dw_pci_dev_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_pci_suspend_late, dw_pci_resume_early) +}; + +static const struct pci_device_id dw_pci_id_table[] = { + /* Medfield */ + { PCI_VDEVICE(INTEL, 0x0827), (kernel_ulong_t)&dw_pci_pdata }, + { PCI_VDEVICE(INTEL, 0x0830), (kernel_ulong_t)&dw_pci_pdata }, + + /* BayTrail */ + { PCI_VDEVICE(INTEL, 0x0f06), (kernel_ulong_t)&dw_pci_pdata }, + { PCI_VDEVICE(INTEL, 0x0f40), (kernel_ulong_t)&dw_pci_pdata }, + + /* Braswell */ + { PCI_VDEVICE(INTEL, 0x2286), (kernel_ulong_t)&dw_pci_pdata }, + { PCI_VDEVICE(INTEL, 0x22c0), (kernel_ulong_t)&dw_pci_pdata }, + + /* Haswell */ + { PCI_VDEVICE(INTEL, 0x9c60), (kernel_ulong_t)&dw_pci_pdata }, + { } +}; +MODULE_DEVICE_TABLE(pci, dw_pci_id_table); + +static struct pci_driver dw_pci_driver = { + .name = "dw_dmac_pci", + .id_table = dw_pci_id_table, + .probe = dw_pci_probe, + .remove = dw_pci_remove, + .driver = { + .pm = &dw_pci_dev_pm_ops, + }, +}; + +module_pci_driver(dw_pci_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller PCI driver"); +MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c new file mode 100644 index 000000000..b2c3ae071 --- /dev/null +++ b/drivers/dma/dw/platform.c @@ -0,0 +1,310 @@ +/* + * Platform driver for the Synopsys DesignWare DMA Controller + * + * Copyright (C) 2007-2008 Atmel Corporation + * Copyright (C) 2010-2011 ST Microelectronics + * Copyright (C) 2013 Intel Corporation + * + * Some parts of this driver are derived from the original dw_dmac. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/device.h> +#include <linux/clk.h> +#include <linux/pm_runtime.h> +#include <linux/platform_device.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/acpi.h> +#include <linux/acpi_dma.h> + +#include "internal.h" + +#define DRV_NAME "dw_dmac" + +static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct dw_dma *dw = ofdma->of_dma_data; + struct dw_dma_slave slave = { + .dma_dev = dw->dma.dev, + }; + dma_cap_mask_t cap; + + if (dma_spec->args_count != 3) + return NULL; + + slave.src_id = dma_spec->args[0]; + slave.dst_id = dma_spec->args[0]; + slave.src_master = dma_spec->args[1]; + slave.dst_master = dma_spec->args[2]; + + if (WARN_ON(slave.src_id >= DW_DMA_MAX_NR_REQUESTS || + slave.dst_id >= DW_DMA_MAX_NR_REQUESTS || + slave.src_master >= dw->nr_masters || + slave.dst_master >= dw->nr_masters)) + return NULL; + + dma_cap_zero(cap); + dma_cap_set(DMA_SLAVE, cap); + + /* TODO: there should be a simpler way to do this */ + return dma_request_channel(cap, dw_dma_filter, &slave); +} + +#ifdef CONFIG_ACPI +static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param) +{ + struct acpi_dma_spec *dma_spec = param; + struct dw_dma_slave slave = { + .dma_dev = dma_spec->dev, + .src_id = dma_spec->slave_id, + .dst_id = dma_spec->slave_id, + .src_master = 1, + .dst_master = 0, + }; + + return dw_dma_filter(chan, &slave); +} + +static void dw_dma_acpi_controller_register(struct dw_dma *dw) +{ + struct device *dev = dw->dma.dev; + struct acpi_dma_filter_info *info; + int ret; + + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return; + + dma_cap_zero(info->dma_cap); + dma_cap_set(DMA_SLAVE, info->dma_cap); + info->filter_fn = dw_dma_acpi_filter; + + ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate, + info); + if (ret) + dev_err(dev, "could not register acpi_dma_controller\n"); +} +#else /* !CONFIG_ACPI */ +static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {} +#endif /* !CONFIG_ACPI */ + +#ifdef CONFIG_OF +static struct dw_dma_platform_data * +dw_dma_parse_dt(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct dw_dma_platform_data *pdata; + u32 tmp, arr[DW_DMA_MAX_NR_MASTERS]; + + if (!np) { + dev_err(&pdev->dev, "Missing DT data\n"); + return NULL; + } + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return NULL; + + if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels)) + return NULL; + + if (of_property_read_bool(np, "is_private")) + pdata->is_private = true; + + if (!of_property_read_u32(np, "chan_allocation_order", &tmp)) + pdata->chan_allocation_order = (unsigned char)tmp; + + if (!of_property_read_u32(np, "chan_priority", &tmp)) + pdata->chan_priority = tmp; + + if (!of_property_read_u32(np, "block_size", &tmp)) + pdata->block_size = tmp; + + if (!of_property_read_u32(np, "dma-masters", &tmp)) { + if (tmp > DW_DMA_MAX_NR_MASTERS) + return NULL; + + pdata->nr_masters = tmp; + } + + if (!of_property_read_u32_array(np, "data_width", arr, + pdata->nr_masters)) + for (tmp = 0; tmp < pdata->nr_masters; tmp++) + pdata->data_width[tmp] = arr[tmp]; + + return pdata; +} +#else +static inline struct dw_dma_platform_data * +dw_dma_parse_dt(struct platform_device *pdev) +{ + return NULL; +} +#endif + +static int dw_probe(struct platform_device *pdev) +{ + struct dw_dma_chip *chip; + struct device *dev = &pdev->dev; + struct resource *mem; + struct dw_dma_platform_data *pdata; + int err; + + chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->irq = platform_get_irq(pdev, 0); + if (chip->irq < 0) + return chip->irq; + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + chip->regs = devm_ioremap_resource(dev, mem); + if (IS_ERR(chip->regs)) + return PTR_ERR(chip->regs); + + err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + if (err) + return err; + + pdata = dev_get_platdata(dev); + if (!pdata) + pdata = dw_dma_parse_dt(pdev); + + chip->dev = dev; + + chip->clk = devm_clk_get(chip->dev, "hclk"); + if (IS_ERR(chip->clk)) + return PTR_ERR(chip->clk); + err = clk_prepare_enable(chip->clk); + if (err) + return err; + + pm_runtime_enable(&pdev->dev); + + err = dw_dma_probe(chip, pdata); + if (err) + goto err_dw_dma_probe; + + platform_set_drvdata(pdev, chip); + + if (pdev->dev.of_node) { + err = of_dma_controller_register(pdev->dev.of_node, + dw_dma_of_xlate, chip->dw); + if (err) + dev_err(&pdev->dev, + "could not register of_dma_controller\n"); + } + + if (ACPI_HANDLE(&pdev->dev)) + dw_dma_acpi_controller_register(chip->dw); + + return 0; + +err_dw_dma_probe: + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(chip->clk); + return err; +} + +static int dw_remove(struct platform_device *pdev) +{ + struct dw_dma_chip *chip = platform_get_drvdata(pdev); + + if (pdev->dev.of_node) + of_dma_controller_free(pdev->dev.of_node); + + dw_dma_remove(chip); + pm_runtime_disable(&pdev->dev); + clk_disable_unprepare(chip->clk); + + return 0; +} + +static void dw_shutdown(struct platform_device *pdev) +{ + struct dw_dma_chip *chip = platform_get_drvdata(pdev); + + dw_dma_disable(chip); + clk_disable_unprepare(chip->clk); +} + +#ifdef CONFIG_OF +static const struct of_device_id dw_dma_of_id_table[] = { + { .compatible = "snps,dma-spear1340" }, + {} +}; +MODULE_DEVICE_TABLE(of, dw_dma_of_id_table); +#endif + +#ifdef CONFIG_ACPI +static const struct acpi_device_id dw_dma_acpi_id_table[] = { + { "INTL9C60", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table); +#endif + +#ifdef CONFIG_PM_SLEEP + +static int dw_suspend_late(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct dw_dma_chip *chip = platform_get_drvdata(pdev); + + dw_dma_disable(chip); + clk_disable_unprepare(chip->clk); + + return 0; +} + +static int dw_resume_early(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct dw_dma_chip *chip = platform_get_drvdata(pdev); + + clk_prepare_enable(chip->clk); + return dw_dma_enable(chip); +} + +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops dw_dev_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_suspend_late, dw_resume_early) +}; + +static struct platform_driver dw_driver = { + .probe = dw_probe, + .remove = dw_remove, + .shutdown = dw_shutdown, + .driver = { + .name = DRV_NAME, + .pm = &dw_dev_pm_ops, + .of_match_table = of_match_ptr(dw_dma_of_id_table), + .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table), + }, +}; + +static int __init dw_init(void) +{ + return platform_driver_register(&dw_driver); +} +subsys_initcall(dw_init); + +static void __exit dw_exit(void) +{ + platform_driver_unregister(&dw_driver); +} +module_exit(dw_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver"); +MODULE_ALIAS("platform:" DRV_NAME); diff --git a/drivers/dma/dw/regs.h b/drivers/dma/dw/regs.h new file mode 100644 index 000000000..241ff2b14 --- /dev/null +++ b/drivers/dma/dw/regs.h @@ -0,0 +1,345 @@ +/* + * Driver for the Synopsys DesignWare AHB DMA Controller + * + * Copyright (C) 2005-2007 Atmel Corporation + * Copyright (C) 2010-2011 ST Microelectronics + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/interrupt.h> +#include <linux/dmaengine.h> + +#define DW_DMA_MAX_NR_CHANNELS 8 +#define DW_DMA_MAX_NR_REQUESTS 16 + +/* flow controller */ +enum dw_dma_fc { + DW_DMA_FC_D_M2M, + DW_DMA_FC_D_M2P, + DW_DMA_FC_D_P2M, + DW_DMA_FC_D_P2P, + DW_DMA_FC_P_P2M, + DW_DMA_FC_SP_P2P, + DW_DMA_FC_P_M2P, + DW_DMA_FC_DP_P2P, +}; + +/* + * Redefine this macro to handle differences between 32- and 64-bit + * addressing, big vs. little endian, etc. + */ +#define DW_REG(name) u32 name; u32 __pad_##name + +/* Hardware register definitions. */ +struct dw_dma_chan_regs { + DW_REG(SAR); /* Source Address Register */ + DW_REG(DAR); /* Destination Address Register */ + DW_REG(LLP); /* Linked List Pointer */ + u32 CTL_LO; /* Control Register Low */ + u32 CTL_HI; /* Control Register High */ + DW_REG(SSTAT); + DW_REG(DSTAT); + DW_REG(SSTATAR); + DW_REG(DSTATAR); + u32 CFG_LO; /* Configuration Register Low */ + u32 CFG_HI; /* Configuration Register High */ + DW_REG(SGR); + DW_REG(DSR); +}; + +struct dw_dma_irq_regs { + DW_REG(XFER); + DW_REG(BLOCK); + DW_REG(SRC_TRAN); + DW_REG(DST_TRAN); + DW_REG(ERROR); +}; + +struct dw_dma_regs { + /* per-channel registers */ + struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS]; + + /* irq handling */ + struct dw_dma_irq_regs RAW; /* r */ + struct dw_dma_irq_regs STATUS; /* r (raw & mask) */ + struct dw_dma_irq_regs MASK; /* rw (set = irq enabled) */ + struct dw_dma_irq_regs CLEAR; /* w (ack, affects "raw") */ + + DW_REG(STATUS_INT); /* r */ + + /* software handshaking */ + DW_REG(REQ_SRC); + DW_REG(REQ_DST); + DW_REG(SGL_REQ_SRC); + DW_REG(SGL_REQ_DST); + DW_REG(LAST_SRC); + DW_REG(LAST_DST); + + /* miscellaneous */ + DW_REG(CFG); + DW_REG(CH_EN); + DW_REG(ID); + DW_REG(TEST); + + /* reserved */ + DW_REG(__reserved0); + DW_REG(__reserved1); + + /* optional encoded params, 0x3c8..0x3f7 */ + u32 __reserved; + + /* per-channel configuration registers */ + u32 DWC_PARAMS[DW_DMA_MAX_NR_CHANNELS]; + u32 MULTI_BLK_TYPE; + u32 MAX_BLK_SIZE; + + /* top-level parameters */ + u32 DW_PARAMS; +}; + +/* + * Big endian I/O access when reading and writing to the DMA controller + * registers. This is needed on some platforms, like the Atmel AVR32 + * architecture. + */ + +#ifdef CONFIG_DW_DMAC_BIG_ENDIAN_IO +#define dma_readl_native ioread32be +#define dma_writel_native iowrite32be +#else +#define dma_readl_native readl +#define dma_writel_native writel +#endif + +/* To access the registers in early stage of probe */ +#define dma_read_byaddr(addr, name) \ + dma_readl_native((addr) + offsetof(struct dw_dma_regs, name)) + +/* Bitfields in DW_PARAMS */ +#define DW_PARAMS_NR_CHAN 8 /* number of channels */ +#define DW_PARAMS_NR_MASTER 11 /* number of AHB masters */ +#define DW_PARAMS_DATA_WIDTH(n) (15 + 2 * (n)) +#define DW_PARAMS_DATA_WIDTH1 15 /* master 1 data width */ +#define DW_PARAMS_DATA_WIDTH2 17 /* master 2 data width */ +#define DW_PARAMS_DATA_WIDTH3 19 /* master 3 data width */ +#define DW_PARAMS_DATA_WIDTH4 21 /* master 4 data width */ +#define DW_PARAMS_EN 28 /* encoded parameters */ + +/* Bitfields in DWC_PARAMS */ +#define DWC_PARAMS_MBLK_EN 11 /* multi block transfer */ + +/* bursts size */ +enum dw_dma_msize { + DW_DMA_MSIZE_1, + DW_DMA_MSIZE_4, + DW_DMA_MSIZE_8, + DW_DMA_MSIZE_16, + DW_DMA_MSIZE_32, + DW_DMA_MSIZE_64, + DW_DMA_MSIZE_128, + DW_DMA_MSIZE_256, +}; + +/* Bitfields in CTL_LO */ +#define DWC_CTLL_INT_EN (1 << 0) /* irqs enabled? */ +#define DWC_CTLL_DST_WIDTH(n) ((n)<<1) /* bytes per element */ +#define DWC_CTLL_SRC_WIDTH(n) ((n)<<4) +#define DWC_CTLL_DST_INC (0<<7) /* DAR update/not */ +#define DWC_CTLL_DST_DEC (1<<7) +#define DWC_CTLL_DST_FIX (2<<7) +#define DWC_CTLL_SRC_INC (0<<7) /* SAR update/not */ +#define DWC_CTLL_SRC_DEC (1<<9) +#define DWC_CTLL_SRC_FIX (2<<9) +#define DWC_CTLL_DST_MSIZE(n) ((n)<<11) /* burst, #elements */ +#define DWC_CTLL_SRC_MSIZE(n) ((n)<<14) +#define DWC_CTLL_S_GATH_EN (1 << 17) /* src gather, !FIX */ +#define DWC_CTLL_D_SCAT_EN (1 << 18) /* dst scatter, !FIX */ +#define DWC_CTLL_FC(n) ((n) << 20) +#define DWC_CTLL_FC_M2M (0 << 20) /* mem-to-mem */ +#define DWC_CTLL_FC_M2P (1 << 20) /* mem-to-periph */ +#define DWC_CTLL_FC_P2M (2 << 20) /* periph-to-mem */ +#define DWC_CTLL_FC_P2P (3 << 20) /* periph-to-periph */ +/* plus 4 transfer types for peripheral-as-flow-controller */ +#define DWC_CTLL_DMS(n) ((n)<<23) /* dst master select */ +#define DWC_CTLL_SMS(n) ((n)<<25) /* src master select */ +#define DWC_CTLL_LLP_D_EN (1 << 27) /* dest block chain */ +#define DWC_CTLL_LLP_S_EN (1 << 28) /* src block chain */ + +/* Bitfields in CTL_HI */ +#define DWC_CTLH_DONE 0x00001000 +#define DWC_CTLH_BLOCK_TS_MASK 0x00000fff + +/* Bitfields in CFG_LO */ +#define DWC_CFGL_CH_PRIOR_MASK (0x7 << 5) /* priority mask */ +#define DWC_CFGL_CH_PRIOR(x) ((x) << 5) /* priority */ +#define DWC_CFGL_CH_SUSP (1 << 8) /* pause xfer */ +#define DWC_CFGL_FIFO_EMPTY (1 << 9) /* pause xfer */ +#define DWC_CFGL_HS_DST (1 << 10) /* handshake w/dst */ +#define DWC_CFGL_HS_SRC (1 << 11) /* handshake w/src */ +#define DWC_CFGL_LOCK_CH_XFER (0 << 12) /* scope of LOCK_CH */ +#define DWC_CFGL_LOCK_CH_BLOCK (1 << 12) +#define DWC_CFGL_LOCK_CH_XACT (2 << 12) +#define DWC_CFGL_LOCK_BUS_XFER (0 << 14) /* scope of LOCK_BUS */ +#define DWC_CFGL_LOCK_BUS_BLOCK (1 << 14) +#define DWC_CFGL_LOCK_BUS_XACT (2 << 14) +#define DWC_CFGL_LOCK_CH (1 << 15) /* channel lockout */ +#define DWC_CFGL_LOCK_BUS (1 << 16) /* busmaster lockout */ +#define DWC_CFGL_HS_DST_POL (1 << 18) /* dst handshake active low */ +#define DWC_CFGL_HS_SRC_POL (1 << 19) /* src handshake active low */ +#define DWC_CFGL_MAX_BURST(x) ((x) << 20) +#define DWC_CFGL_RELOAD_SAR (1 << 30) +#define DWC_CFGL_RELOAD_DAR (1 << 31) + +/* Bitfields in CFG_HI */ +#define DWC_CFGH_FCMODE (1 << 0) +#define DWC_CFGH_FIFO_MODE (1 << 1) +#define DWC_CFGH_PROTCTL(x) ((x) << 2) +#define DWC_CFGH_DS_UPD_EN (1 << 5) +#define DWC_CFGH_SS_UPD_EN (1 << 6) +#define DWC_CFGH_SRC_PER(x) ((x) << 7) +#define DWC_CFGH_DST_PER(x) ((x) << 11) + +/* Bitfields in SGR */ +#define DWC_SGR_SGI(x) ((x) << 0) +#define DWC_SGR_SGC(x) ((x) << 20) + +/* Bitfields in DSR */ +#define DWC_DSR_DSI(x) ((x) << 0) +#define DWC_DSR_DSC(x) ((x) << 20) + +/* Bitfields in CFG */ +#define DW_CFG_DMA_EN (1 << 0) + +enum dw_dmac_flags { + DW_DMA_IS_CYCLIC = 0, + DW_DMA_IS_SOFT_LLP = 1, +}; + +struct dw_dma_chan { + struct dma_chan chan; + void __iomem *ch_regs; + u8 mask; + u8 priority; + enum dma_transfer_direction direction; + bool paused; + bool initialized; + + /* software emulation of the LLP transfers */ + struct list_head *tx_node_active; + + spinlock_t lock; + + /* these other elements are all protected by lock */ + unsigned long flags; + struct list_head active_list; + struct list_head queue; + struct list_head free_list; + u32 residue; + struct dw_cyclic_desc *cdesc; + + unsigned int descs_allocated; + + /* hardware configuration */ + unsigned int block_size; + bool nollp; + + /* custom slave configuration */ + u8 src_id; + u8 dst_id; + u8 src_master; + u8 dst_master; + + /* configuration passed via .device_config */ + struct dma_slave_config dma_sconfig; +}; + +static inline struct dw_dma_chan_regs __iomem * +__dwc_regs(struct dw_dma_chan *dwc) +{ + return dwc->ch_regs; +} + +#define channel_readl(dwc, name) \ + dma_readl_native(&(__dwc_regs(dwc)->name)) +#define channel_writel(dwc, name, val) \ + dma_writel_native((val), &(__dwc_regs(dwc)->name)) + +static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct dw_dma_chan, chan); +} + +struct dw_dma { + struct dma_device dma; + void __iomem *regs; + struct dma_pool *desc_pool; + struct tasklet_struct tasklet; + + /* channels */ + struct dw_dma_chan *chan; + u8 all_chan_mask; + u8 in_use; + + /* hardware configuration */ + unsigned char nr_masters; + unsigned char data_width[DW_DMA_MAX_NR_MASTERS]; +}; + +static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw) +{ + return dw->regs; +} + +#define dma_readl(dw, name) \ + dma_readl_native(&(__dw_regs(dw)->name)) +#define dma_writel(dw, name, val) \ + dma_writel_native((val), &(__dw_regs(dw)->name)) + +#define channel_set_bit(dw, reg, mask) \ + dma_writel(dw, reg, ((mask) << 8) | (mask)) +#define channel_clear_bit(dw, reg, mask) \ + dma_writel(dw, reg, ((mask) << 8) | 0) + +static inline struct dw_dma *to_dw_dma(struct dma_device *ddev) +{ + return container_of(ddev, struct dw_dma, dma); +} + +/* LLI == Linked List Item; a.k.a. DMA block descriptor */ +struct dw_lli { + /* values that are not changed by hardware */ + u32 sar; + u32 dar; + u32 llp; /* chain to next lli */ + u32 ctllo; + /* values that may get written back: */ + u32 ctlhi; + /* sstat and dstat can snapshot peripheral register state. + * silicon config may discard either or both... + */ + u32 sstat; + u32 dstat; +}; + +struct dw_desc { + /* FIRST values the hardware uses */ + struct dw_lli lli; + + /* THEN values for driver housekeeping */ + struct list_head desc_node; + struct list_head tx_list; + struct dma_async_tx_descriptor txd; + size_t len; + size_t total_len; +}; + +#define to_dw_desc(h) list_entry(h, struct dw_desc, desc_node) + +static inline struct dw_desc * +txd_to_dw_desc(struct dma_async_tx_descriptor *txd) +{ + return container_of(txd, struct dw_desc, txd); +} diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c new file mode 100644 index 000000000..bf09db7ca --- /dev/null +++ b/drivers/dma/edma.c @@ -0,0 +1,1103 @@ +/* + * TI EDMA DMA engine driver + * + * Copyright 2012 Texas Instruments + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation version 2. + * + * This program is distributed "as is" WITHOUT ANY WARRANTY of any + * kind, whether express or implied; without even the implied warranty + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/edma.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/of.h> + +#include <linux/platform_data/edma.h> + +#include "dmaengine.h" +#include "virt-dma.h" + +/* + * This will go away when the private EDMA API is folded + * into this driver and the platform device(s) are + * instantiated in the arch code. We can only get away + * with this simplification because DA8XX may not be built + * in the same kernel image with other DaVinci parts. This + * avoids having to sprinkle dmaengine driver platform devices + * and data throughout all the existing board files. + */ +#ifdef CONFIG_ARCH_DAVINCI_DA8XX +#define EDMA_CTLRS 2 +#define EDMA_CHANS 32 +#else +#define EDMA_CTLRS 1 +#define EDMA_CHANS 64 +#endif /* CONFIG_ARCH_DAVINCI_DA8XX */ + +/* + * Max of 20 segments per channel to conserve PaRAM slots + * Also note that MAX_NR_SG should be atleast the no.of periods + * that are required for ASoC, otherwise DMA prep calls will + * fail. Today davinci-pcm is the only user of this driver and + * requires atleast 17 slots, so we setup the default to 20. + */ +#define MAX_NR_SG 20 +#define EDMA_MAX_SLOTS MAX_NR_SG +#define EDMA_DESCRIPTORS 16 + +struct edma_pset { + u32 len; + dma_addr_t addr; + struct edmacc_param param; +}; + +struct edma_desc { + struct virt_dma_desc vdesc; + struct list_head node; + enum dma_transfer_direction direction; + int cyclic; + int absync; + int pset_nr; + struct edma_chan *echan; + int processed; + + /* + * The following 4 elements are used for residue accounting. + * + * - processed_stat: the number of SG elements we have traversed + * so far to cover accounting. This is updated directly to processed + * during edma_callback and is always <= processed, because processed + * refers to the number of pending transfer (programmed to EDMA + * controller), where as processed_stat tracks number of transfers + * accounted for so far. + * + * - residue: The amount of bytes we have left to transfer for this desc + * + * - residue_stat: The residue in bytes of data we have covered + * so far for accounting. This is updated directly to residue + * during callbacks to keep it current. + * + * - sg_len: Tracks the length of the current intermediate transfer, + * this is required to update the residue during intermediate transfer + * completion callback. + */ + int processed_stat; + u32 sg_len; + u32 residue; + u32 residue_stat; + + struct edma_pset pset[0]; +}; + +struct edma_cc; + +struct edma_chan { + struct virt_dma_chan vchan; + struct list_head node; + struct edma_desc *edesc; + struct edma_cc *ecc; + int ch_num; + bool alloced; + int slot[EDMA_MAX_SLOTS]; + int missed; + struct dma_slave_config cfg; +}; + +struct edma_cc { + int ctlr; + struct dma_device dma_slave; + struct edma_chan slave_chans[EDMA_CHANS]; + int num_slave_chans; + int dummy_slot; +}; + +static inline struct edma_cc *to_edma_cc(struct dma_device *d) +{ + return container_of(d, struct edma_cc, dma_slave); +} + +static inline struct edma_chan *to_edma_chan(struct dma_chan *c) +{ + return container_of(c, struct edma_chan, vchan.chan); +} + +static inline struct edma_desc +*to_edma_desc(struct dma_async_tx_descriptor *tx) +{ + return container_of(tx, struct edma_desc, vdesc.tx); +} + +static void edma_desc_free(struct virt_dma_desc *vdesc) +{ + kfree(container_of(vdesc, struct edma_desc, vdesc)); +} + +/* Dispatch a queued descriptor to the controller (caller holds lock) */ +static void edma_execute(struct edma_chan *echan) +{ + struct virt_dma_desc *vdesc; + struct edma_desc *edesc; + struct device *dev = echan->vchan.chan.device->dev; + int i, j, left, nslots; + + /* If either we processed all psets or we're still not started */ + if (!echan->edesc || + echan->edesc->pset_nr == echan->edesc->processed) { + /* Get next vdesc */ + vdesc = vchan_next_desc(&echan->vchan); + if (!vdesc) { + echan->edesc = NULL; + return; + } + list_del(&vdesc->node); + echan->edesc = to_edma_desc(&vdesc->tx); + } + + edesc = echan->edesc; + + /* Find out how many left */ + left = edesc->pset_nr - edesc->processed; + nslots = min(MAX_NR_SG, left); + edesc->sg_len = 0; + + /* Write descriptor PaRAM set(s) */ + for (i = 0; i < nslots; i++) { + j = i + edesc->processed; + edma_write_slot(echan->slot[i], &edesc->pset[j].param); + edesc->sg_len += edesc->pset[j].len; + dev_vdbg(echan->vchan.chan.device->dev, + "\n pset[%d]:\n" + " chnum\t%d\n" + " slot\t%d\n" + " opt\t%08x\n" + " src\t%08x\n" + " dst\t%08x\n" + " abcnt\t%08x\n" + " ccnt\t%08x\n" + " bidx\t%08x\n" + " cidx\t%08x\n" + " lkrld\t%08x\n", + j, echan->ch_num, echan->slot[i], + edesc->pset[j].param.opt, + edesc->pset[j].param.src, + edesc->pset[j].param.dst, + edesc->pset[j].param.a_b_cnt, + edesc->pset[j].param.ccnt, + edesc->pset[j].param.src_dst_bidx, + edesc->pset[j].param.src_dst_cidx, + edesc->pset[j].param.link_bcntrld); + /* Link to the previous slot if not the last set */ + if (i != (nslots - 1)) + edma_link(echan->slot[i], echan->slot[i+1]); + } + + edesc->processed += nslots; + + /* + * If this is either the last set in a set of SG-list transactions + * then setup a link to the dummy slot, this results in all future + * events being absorbed and that's OK because we're done + */ + if (edesc->processed == edesc->pset_nr) { + if (edesc->cyclic) + edma_link(echan->slot[nslots-1], echan->slot[1]); + else + edma_link(echan->slot[nslots-1], + echan->ecc->dummy_slot); + } + + if (edesc->processed <= MAX_NR_SG) { + dev_dbg(dev, "first transfer starting on channel %d\n", + echan->ch_num); + edma_start(echan->ch_num); + } else { + dev_dbg(dev, "chan: %d: completed %d elements, resuming\n", + echan->ch_num, edesc->processed); + edma_resume(echan->ch_num); + } + + /* + * This happens due to setup times between intermediate transfers + * in long SG lists which have to be broken up into transfers of + * MAX_NR_SG + */ + if (echan->missed) { + dev_dbg(dev, "missed event on channel %d\n", echan->ch_num); + edma_clean_channel(echan->ch_num); + edma_stop(echan->ch_num); + edma_start(echan->ch_num); + edma_trigger_channel(echan->ch_num); + echan->missed = 0; + } +} + +static int edma_terminate_all(struct dma_chan *chan) +{ + struct edma_chan *echan = to_edma_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&echan->vchan.lock, flags); + + /* + * Stop DMA activity: we assume the callback will not be called + * after edma_dma() returns (even if it does, it will see + * echan->edesc is NULL and exit.) + */ + if (echan->edesc) { + int cyclic = echan->edesc->cyclic; + + /* + * free the running request descriptor + * since it is not in any of the vdesc lists + */ + edma_desc_free(&echan->edesc->vdesc); + + echan->edesc = NULL; + edma_stop(echan->ch_num); + /* Move the cyclic channel back to default queue */ + if (cyclic) + edma_assign_channel_eventq(echan->ch_num, + EVENTQ_DEFAULT); + } + + vchan_get_all_descriptors(&echan->vchan, &head); + spin_unlock_irqrestore(&echan->vchan.lock, flags); + vchan_dma_desc_free_list(&echan->vchan, &head); + + return 0; +} + +static int edma_slave_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct edma_chan *echan = to_edma_chan(chan); + + if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || + cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) + return -EINVAL; + + memcpy(&echan->cfg, cfg, sizeof(echan->cfg)); + + return 0; +} + +static int edma_dma_pause(struct dma_chan *chan) +{ + struct edma_chan *echan = to_edma_chan(chan); + + /* Pause/Resume only allowed with cyclic mode */ + if (!echan->edesc || !echan->edesc->cyclic) + return -EINVAL; + + edma_pause(echan->ch_num); + return 0; +} + +static int edma_dma_resume(struct dma_chan *chan) +{ + struct edma_chan *echan = to_edma_chan(chan); + + /* Pause/Resume only allowed with cyclic mode */ + if (!echan->edesc->cyclic) + return -EINVAL; + + edma_resume(echan->ch_num); + return 0; +} + +/* + * A PaRAM set configuration abstraction used by other modes + * @chan: Channel who's PaRAM set we're configuring + * @pset: PaRAM set to initialize and setup. + * @src_addr: Source address of the DMA + * @dst_addr: Destination address of the DMA + * @burst: In units of dev_width, how much to send + * @dev_width: How much is the dev_width + * @dma_length: Total length of the DMA transfer + * @direction: Direction of the transfer + */ +static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset, + dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst, + enum dma_slave_buswidth dev_width, unsigned int dma_length, + enum dma_transfer_direction direction) +{ + struct edma_chan *echan = to_edma_chan(chan); + struct device *dev = chan->device->dev; + struct edmacc_param *param = &epset->param; + int acnt, bcnt, ccnt, cidx; + int src_bidx, dst_bidx, src_cidx, dst_cidx; + int absync; + + acnt = dev_width; + + /* src/dst_maxburst == 0 is the same case as src/dst_maxburst == 1 */ + if (!burst) + burst = 1; + /* + * If the maxburst is equal to the fifo width, use + * A-synced transfers. This allows for large contiguous + * buffer transfers using only one PaRAM set. + */ + if (burst == 1) { + /* + * For the A-sync case, bcnt and ccnt are the remainder + * and quotient respectively of the division of: + * (dma_length / acnt) by (SZ_64K -1). This is so + * that in case bcnt over flows, we have ccnt to use. + * Note: In A-sync tranfer only, bcntrld is used, but it + * only applies for sg_dma_len(sg) >= SZ_64K. + * In this case, the best way adopted is- bccnt for the + * first frame will be the remainder below. Then for + * every successive frame, bcnt will be SZ_64K-1. This + * is assured as bcntrld = 0xffff in end of function. + */ + absync = false; + ccnt = dma_length / acnt / (SZ_64K - 1); + bcnt = dma_length / acnt - ccnt * (SZ_64K - 1); + /* + * If bcnt is non-zero, we have a remainder and hence an + * extra frame to transfer, so increment ccnt. + */ + if (bcnt) + ccnt++; + else + bcnt = SZ_64K - 1; + cidx = acnt; + } else { + /* + * If maxburst is greater than the fifo address_width, + * use AB-synced transfers where A count is the fifo + * address_width and B count is the maxburst. In this + * case, we are limited to transfers of C count frames + * of (address_width * maxburst) where C count is limited + * to SZ_64K-1. This places an upper bound on the length + * of an SG segment that can be handled. + */ + absync = true; + bcnt = burst; + ccnt = dma_length / (acnt * bcnt); + if (ccnt > (SZ_64K - 1)) { + dev_err(dev, "Exceeded max SG segment size\n"); + return -EINVAL; + } + cidx = acnt * bcnt; + } + + epset->len = dma_length; + + if (direction == DMA_MEM_TO_DEV) { + src_bidx = acnt; + src_cidx = cidx; + dst_bidx = 0; + dst_cidx = 0; + epset->addr = src_addr; + } else if (direction == DMA_DEV_TO_MEM) { + src_bidx = 0; + src_cidx = 0; + dst_bidx = acnt; + dst_cidx = cidx; + epset->addr = dst_addr; + } else if (direction == DMA_MEM_TO_MEM) { + src_bidx = acnt; + src_cidx = cidx; + dst_bidx = acnt; + dst_cidx = cidx; + } else { + dev_err(dev, "%s: direction not implemented yet\n", __func__); + return -EINVAL; + } + + param->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num)); + /* Configure A or AB synchronized transfers */ + if (absync) + param->opt |= SYNCDIM; + + param->src = src_addr; + param->dst = dst_addr; + + param->src_dst_bidx = (dst_bidx << 16) | src_bidx; + param->src_dst_cidx = (dst_cidx << 16) | src_cidx; + + param->a_b_cnt = bcnt << 16 | acnt; + param->ccnt = ccnt; + /* + * Only time when (bcntrld) auto reload is required is for + * A-sync case, and in this case, a requirement of reload value + * of SZ_64K-1 only is assured. 'link' is initially set to NULL + * and then later will be populated by edma_execute. + */ + param->link_bcntrld = 0xffffffff; + return absync; +} + +static struct dma_async_tx_descriptor *edma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long tx_flags, void *context) +{ + struct edma_chan *echan = to_edma_chan(chan); + struct device *dev = chan->device->dev; + struct edma_desc *edesc; + dma_addr_t src_addr = 0, dst_addr = 0; + enum dma_slave_buswidth dev_width; + u32 burst; + struct scatterlist *sg; + int i, nslots, ret; + + if (unlikely(!echan || !sgl || !sg_len)) + return NULL; + + if (direction == DMA_DEV_TO_MEM) { + src_addr = echan->cfg.src_addr; + dev_width = echan->cfg.src_addr_width; + burst = echan->cfg.src_maxburst; + } else if (direction == DMA_MEM_TO_DEV) { + dst_addr = echan->cfg.dst_addr; + dev_width = echan->cfg.dst_addr_width; + burst = echan->cfg.dst_maxburst; + } else { + dev_err(dev, "%s: bad direction: %d\n", __func__, direction); + return NULL; + } + + if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) { + dev_err(dev, "%s: Undefined slave buswidth\n", __func__); + return NULL; + } + + edesc = kzalloc(sizeof(*edesc) + sg_len * + sizeof(edesc->pset[0]), GFP_ATOMIC); + if (!edesc) { + dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__); + return NULL; + } + + edesc->pset_nr = sg_len; + edesc->residue = 0; + edesc->direction = direction; + edesc->echan = echan; + + /* Allocate a PaRAM slot, if needed */ + nslots = min_t(unsigned, MAX_NR_SG, sg_len); + + for (i = 0; i < nslots; i++) { + if (echan->slot[i] < 0) { + echan->slot[i] = + edma_alloc_slot(EDMA_CTLR(echan->ch_num), + EDMA_SLOT_ANY); + if (echan->slot[i] < 0) { + kfree(edesc); + dev_err(dev, "%s: Failed to allocate slot\n", + __func__); + return NULL; + } + } + } + + /* Configure PaRAM sets for each SG */ + for_each_sg(sgl, sg, sg_len, i) { + /* Get address for each SG */ + if (direction == DMA_DEV_TO_MEM) + dst_addr = sg_dma_address(sg); + else + src_addr = sg_dma_address(sg); + + ret = edma_config_pset(chan, &edesc->pset[i], src_addr, + dst_addr, burst, dev_width, + sg_dma_len(sg), direction); + if (ret < 0) { + kfree(edesc); + return NULL; + } + + edesc->absync = ret; + edesc->residue += sg_dma_len(sg); + + /* If this is the last in a current SG set of transactions, + enable interrupts so that next set is processed */ + if (!((i+1) % MAX_NR_SG)) + edesc->pset[i].param.opt |= TCINTEN; + + /* If this is the last set, enable completion interrupt flag */ + if (i == sg_len - 1) + edesc->pset[i].param.opt |= TCINTEN; + } + edesc->residue_stat = edesc->residue; + + return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); +} + +static struct dma_async_tx_descriptor *edma_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long tx_flags) +{ + int ret; + struct edma_desc *edesc; + struct device *dev = chan->device->dev; + struct edma_chan *echan = to_edma_chan(chan); + + if (unlikely(!echan || !len)) + return NULL; + + edesc = kzalloc(sizeof(*edesc) + sizeof(edesc->pset[0]), GFP_ATOMIC); + if (!edesc) { + dev_dbg(dev, "Failed to allocate a descriptor\n"); + return NULL; + } + + edesc->pset_nr = 1; + + ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1, + DMA_SLAVE_BUSWIDTH_4_BYTES, len, DMA_MEM_TO_MEM); + if (ret < 0) + return NULL; + + edesc->absync = ret; + + /* + * Enable intermediate transfer chaining to re-trigger channel + * on completion of every TR, and enable transfer-completion + * interrupt on completion of the whole transfer. + */ + edesc->pset[0].param.opt |= ITCCHEN; + edesc->pset[0].param.opt |= TCINTEN; + + return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); +} + +static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long tx_flags) +{ + struct edma_chan *echan = to_edma_chan(chan); + struct device *dev = chan->device->dev; + struct edma_desc *edesc; + dma_addr_t src_addr, dst_addr; + enum dma_slave_buswidth dev_width; + u32 burst; + int i, ret, nslots; + + if (unlikely(!echan || !buf_len || !period_len)) + return NULL; + + if (direction == DMA_DEV_TO_MEM) { + src_addr = echan->cfg.src_addr; + dst_addr = buf_addr; + dev_width = echan->cfg.src_addr_width; + burst = echan->cfg.src_maxburst; + } else if (direction == DMA_MEM_TO_DEV) { + src_addr = buf_addr; + dst_addr = echan->cfg.dst_addr; + dev_width = echan->cfg.dst_addr_width; + burst = echan->cfg.dst_maxburst; + } else { + dev_err(dev, "%s: bad direction: %d\n", __func__, direction); + return NULL; + } + + if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) { + dev_err(dev, "%s: Undefined slave buswidth\n", __func__); + return NULL; + } + + if (unlikely(buf_len % period_len)) { + dev_err(dev, "Period should be multiple of Buffer length\n"); + return NULL; + } + + nslots = (buf_len / period_len) + 1; + + /* + * Cyclic DMA users such as audio cannot tolerate delays introduced + * by cases where the number of periods is more than the maximum + * number of SGs the EDMA driver can handle at a time. For DMA types + * such as Slave SGs, such delays are tolerable and synchronized, + * but the synchronization is difficult to achieve with Cyclic and + * cannot be guaranteed, so we error out early. + */ + if (nslots > MAX_NR_SG) + return NULL; + + edesc = kzalloc(sizeof(*edesc) + nslots * + sizeof(edesc->pset[0]), GFP_ATOMIC); + if (!edesc) { + dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__); + return NULL; + } + + edesc->cyclic = 1; + edesc->pset_nr = nslots; + edesc->residue = edesc->residue_stat = buf_len; + edesc->direction = direction; + edesc->echan = echan; + + dev_dbg(dev, "%s: channel=%d nslots=%d period_len=%zu buf_len=%zu\n", + __func__, echan->ch_num, nslots, period_len, buf_len); + + for (i = 0; i < nslots; i++) { + /* Allocate a PaRAM slot, if needed */ + if (echan->slot[i] < 0) { + echan->slot[i] = + edma_alloc_slot(EDMA_CTLR(echan->ch_num), + EDMA_SLOT_ANY); + if (echan->slot[i] < 0) { + kfree(edesc); + dev_err(dev, "%s: Failed to allocate slot\n", + __func__); + return NULL; + } + } + + if (i == nslots - 1) { + memcpy(&edesc->pset[i], &edesc->pset[0], + sizeof(edesc->pset[0])); + break; + } + + ret = edma_config_pset(chan, &edesc->pset[i], src_addr, + dst_addr, burst, dev_width, period_len, + direction); + if (ret < 0) { + kfree(edesc); + return NULL; + } + + if (direction == DMA_DEV_TO_MEM) + dst_addr += period_len; + else + src_addr += period_len; + + dev_vdbg(dev, "%s: Configure period %d of buf:\n", __func__, i); + dev_vdbg(dev, + "\n pset[%d]:\n" + " chnum\t%d\n" + " slot\t%d\n" + " opt\t%08x\n" + " src\t%08x\n" + " dst\t%08x\n" + " abcnt\t%08x\n" + " ccnt\t%08x\n" + " bidx\t%08x\n" + " cidx\t%08x\n" + " lkrld\t%08x\n", + i, echan->ch_num, echan->slot[i], + edesc->pset[i].param.opt, + edesc->pset[i].param.src, + edesc->pset[i].param.dst, + edesc->pset[i].param.a_b_cnt, + edesc->pset[i].param.ccnt, + edesc->pset[i].param.src_dst_bidx, + edesc->pset[i].param.src_dst_cidx, + edesc->pset[i].param.link_bcntrld); + + edesc->absync = ret; + + /* + * Enable period interrupt only if it is requested + */ + if (tx_flags & DMA_PREP_INTERRUPT) + edesc->pset[i].param.opt |= TCINTEN; + } + + /* Place the cyclic channel to highest priority queue */ + edma_assign_channel_eventq(echan->ch_num, EVENTQ_0); + + return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags); +} + +static void edma_callback(unsigned ch_num, u16 ch_status, void *data) +{ + struct edma_chan *echan = data; + struct device *dev = echan->vchan.chan.device->dev; + struct edma_desc *edesc; + struct edmacc_param p; + + edesc = echan->edesc; + + /* Pause the channel for non-cyclic */ + if (!edesc || (edesc && !edesc->cyclic)) + edma_pause(echan->ch_num); + + switch (ch_status) { + case EDMA_DMA_COMPLETE: + spin_lock(&echan->vchan.lock); + + if (edesc) { + if (edesc->cyclic) { + vchan_cyclic_callback(&edesc->vdesc); + } else if (edesc->processed == edesc->pset_nr) { + dev_dbg(dev, "Transfer complete, stopping channel %d\n", ch_num); + edesc->residue = 0; + edma_stop(echan->ch_num); + vchan_cookie_complete(&edesc->vdesc); + edma_execute(echan); + } else { + dev_dbg(dev, "Intermediate transfer complete on channel %d\n", ch_num); + + /* Update statistics for tx_status */ + edesc->residue -= edesc->sg_len; + edesc->residue_stat = edesc->residue; + edesc->processed_stat = edesc->processed; + + edma_execute(echan); + } + } + + spin_unlock(&echan->vchan.lock); + + break; + case EDMA_DMA_CC_ERROR: + spin_lock(&echan->vchan.lock); + + edma_read_slot(EDMA_CHAN_SLOT(echan->slot[0]), &p); + + /* + * Issue later based on missed flag which will be sure + * to happen as: + * (1) we finished transmitting an intermediate slot and + * edma_execute is coming up. + * (2) or we finished current transfer and issue will + * call edma_execute. + * + * Important note: issuing can be dangerous here and + * lead to some nasty recursion when we are in a NULL + * slot. So we avoid doing so and set the missed flag. + */ + if (p.a_b_cnt == 0 && p.ccnt == 0) { + dev_dbg(dev, "Error occurred, looks like slot is null, just setting miss\n"); + echan->missed = 1; + } else { + /* + * The slot is already programmed but the event got + * missed, so its safe to issue it here. + */ + dev_dbg(dev, "Error occurred but slot is non-null, TRIGGERING\n"); + edma_clean_channel(echan->ch_num); + edma_stop(echan->ch_num); + edma_start(echan->ch_num); + edma_trigger_channel(echan->ch_num); + } + + spin_unlock(&echan->vchan.lock); + + break; + default: + break; + } +} + +/* Alloc channel resources */ +static int edma_alloc_chan_resources(struct dma_chan *chan) +{ + struct edma_chan *echan = to_edma_chan(chan); + struct device *dev = chan->device->dev; + int ret; + int a_ch_num; + LIST_HEAD(descs); + + a_ch_num = edma_alloc_channel(echan->ch_num, edma_callback, + echan, EVENTQ_DEFAULT); + + if (a_ch_num < 0) { + ret = -ENODEV; + goto err_no_chan; + } + + if (a_ch_num != echan->ch_num) { + dev_err(dev, "failed to allocate requested channel %u:%u\n", + EDMA_CTLR(echan->ch_num), + EDMA_CHAN_SLOT(echan->ch_num)); + ret = -ENODEV; + goto err_wrong_chan; + } + + echan->alloced = true; + echan->slot[0] = echan->ch_num; + + dev_dbg(dev, "allocated channel %d for %u:%u\n", echan->ch_num, + EDMA_CTLR(echan->ch_num), EDMA_CHAN_SLOT(echan->ch_num)); + + return 0; + +err_wrong_chan: + edma_free_channel(a_ch_num); +err_no_chan: + return ret; +} + +/* Free channel resources */ +static void edma_free_chan_resources(struct dma_chan *chan) +{ + struct edma_chan *echan = to_edma_chan(chan); + struct device *dev = chan->device->dev; + int i; + + /* Terminate transfers */ + edma_stop(echan->ch_num); + + vchan_free_chan_resources(&echan->vchan); + + /* Free EDMA PaRAM slots */ + for (i = 1; i < EDMA_MAX_SLOTS; i++) { + if (echan->slot[i] >= 0) { + edma_free_slot(echan->slot[i]); + echan->slot[i] = -1; + } + } + + /* Free EDMA channel */ + if (echan->alloced) { + edma_free_channel(echan->ch_num); + echan->alloced = false; + } + + dev_dbg(dev, "freeing channel for %u\n", echan->ch_num); +} + +/* Send pending descriptor to hardware */ +static void edma_issue_pending(struct dma_chan *chan) +{ + struct edma_chan *echan = to_edma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&echan->vchan.lock, flags); + if (vchan_issue_pending(&echan->vchan) && !echan->edesc) + edma_execute(echan); + spin_unlock_irqrestore(&echan->vchan.lock, flags); +} + +static u32 edma_residue(struct edma_desc *edesc) +{ + bool dst = edesc->direction == DMA_DEV_TO_MEM; + struct edma_pset *pset = edesc->pset; + dma_addr_t done, pos; + int i; + + /* + * We always read the dst/src position from the first RamPar + * pset. That's the one which is active now. + */ + pos = edma_get_position(edesc->echan->slot[0], dst); + + /* + * Cyclic is simple. Just subtract pset[0].addr from pos. + * + * We never update edesc->residue in the cyclic case, so we + * can tell the remaining room to the end of the circular + * buffer. + */ + if (edesc->cyclic) { + done = pos - pset->addr; + edesc->residue_stat = edesc->residue - done; + return edesc->residue_stat; + } + + /* + * For SG operation we catch up with the last processed + * status. + */ + pset += edesc->processed_stat; + + for (i = edesc->processed_stat; i < edesc->processed; i++, pset++) { + /* + * If we are inside this pset address range, we know + * this is the active one. Get the current delta and + * stop walking the psets. + */ + if (pos >= pset->addr && pos < pset->addr + pset->len) + return edesc->residue_stat - (pos - pset->addr); + + /* Otherwise mark it done and update residue_stat. */ + edesc->processed_stat++; + edesc->residue_stat -= pset->len; + } + return edesc->residue_stat; +} + +/* Check request completion status */ +static enum dma_status edma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct edma_chan *echan = to_edma_chan(chan); + struct virt_dma_desc *vdesc; + enum dma_status ret; + unsigned long flags; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE || !txstate) + return ret; + + spin_lock_irqsave(&echan->vchan.lock, flags); + if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie) + txstate->residue = edma_residue(echan->edesc); + else if ((vdesc = vchan_find_desc(&echan->vchan, cookie))) + txstate->residue = to_edma_desc(&vdesc->tx)->residue; + spin_unlock_irqrestore(&echan->vchan.lock, flags); + + return ret; +} + +static void __init edma_chan_init(struct edma_cc *ecc, + struct dma_device *dma, + struct edma_chan *echans) +{ + int i, j; + + for (i = 0; i < EDMA_CHANS; i++) { + struct edma_chan *echan = &echans[i]; + echan->ch_num = EDMA_CTLR_CHAN(ecc->ctlr, i); + echan->ecc = ecc; + echan->vchan.desc_free = edma_desc_free; + + vchan_init(&echan->vchan, dma); + + INIT_LIST_HEAD(&echan->node); + for (j = 0; j < EDMA_MAX_SLOTS; j++) + echan->slot[j] = -1; + } +} + +#define EDMA_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) + +static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma, + struct device *dev) +{ + dma->device_prep_slave_sg = edma_prep_slave_sg; + dma->device_prep_dma_cyclic = edma_prep_dma_cyclic; + dma->device_prep_dma_memcpy = edma_prep_dma_memcpy; + dma->device_alloc_chan_resources = edma_alloc_chan_resources; + dma->device_free_chan_resources = edma_free_chan_resources; + dma->device_issue_pending = edma_issue_pending; + dma->device_tx_status = edma_tx_status; + dma->device_config = edma_slave_config; + dma->device_pause = edma_dma_pause; + dma->device_resume = edma_dma_resume; + dma->device_terminate_all = edma_terminate_all; + + dma->src_addr_widths = EDMA_DMA_BUSWIDTHS; + dma->dst_addr_widths = EDMA_DMA_BUSWIDTHS; + dma->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + dma->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + dma->dev = dev; + + /* + * code using dma memcpy must make sure alignment of + * length is at dma->copy_align boundary. + */ + dma->copy_align = DMA_SLAVE_BUSWIDTH_4_BYTES; + + INIT_LIST_HEAD(&dma->channels); +} + +static int edma_probe(struct platform_device *pdev) +{ + struct edma_cc *ecc; + int ret; + + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + ecc = devm_kzalloc(&pdev->dev, sizeof(*ecc), GFP_KERNEL); + if (!ecc) { + dev_err(&pdev->dev, "Can't allocate controller\n"); + return -ENOMEM; + } + + ecc->ctlr = pdev->id; + ecc->dummy_slot = edma_alloc_slot(ecc->ctlr, EDMA_SLOT_ANY); + if (ecc->dummy_slot < 0) { + dev_err(&pdev->dev, "Can't allocate PaRAM dummy slot\n"); + return ecc->dummy_slot; + } + + dma_cap_zero(ecc->dma_slave.cap_mask); + dma_cap_set(DMA_SLAVE, ecc->dma_slave.cap_mask); + dma_cap_set(DMA_CYCLIC, ecc->dma_slave.cap_mask); + dma_cap_set(DMA_MEMCPY, ecc->dma_slave.cap_mask); + + edma_dma_init(ecc, &ecc->dma_slave, &pdev->dev); + + edma_chan_init(ecc, &ecc->dma_slave, ecc->slave_chans); + + ret = dma_async_device_register(&ecc->dma_slave); + if (ret) + goto err_reg1; + + platform_set_drvdata(pdev, ecc); + + dev_info(&pdev->dev, "TI EDMA DMA engine driver\n"); + + return 0; + +err_reg1: + edma_free_slot(ecc->dummy_slot); + return ret; +} + +static int edma_remove(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct edma_cc *ecc = dev_get_drvdata(dev); + + dma_async_device_unregister(&ecc->dma_slave); + edma_free_slot(ecc->dummy_slot); + + return 0; +} + +static struct platform_driver edma_driver = { + .probe = edma_probe, + .remove = edma_remove, + .driver = { + .name = "edma-dma-engine", + }, +}; + +bool edma_filter_fn(struct dma_chan *chan, void *param) +{ + if (chan->device->dev->driver == &edma_driver.driver) { + struct edma_chan *echan = to_edma_chan(chan); + unsigned ch_req = *(unsigned *)param; + return ch_req == echan->ch_num; + } + return false; +} +EXPORT_SYMBOL(edma_filter_fn); + +static int edma_init(void) +{ + return platform_driver_register(&edma_driver); +} +subsys_initcall(edma_init); + +static void __exit edma_exit(void) +{ + platform_driver_unregister(&edma_driver); +} +module_exit(edma_exit); + +MODULE_AUTHOR("Matt Porter <matt.porter@linaro.org>"); +MODULE_DESCRIPTION("TI EDMA DMA engine driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c new file mode 100644 index 000000000..24e5290fa --- /dev/null +++ b/drivers/dma/ep93xx_dma.c @@ -0,0 +1,1388 @@ +/* + * Driver for the Cirrus Logic EP93xx DMA Controller + * + * Copyright (C) 2011 Mika Westerberg + * + * DMA M2P implementation is based on the original + * arch/arm/mach-ep93xx/dma-m2p.c which has following copyrights: + * + * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org> + * Copyright (C) 2006 Applied Data Systems + * Copyright (C) 2009 Ryan Mallon <rmallon@gmail.com> + * + * This driver is based on dw_dmac and amba-pl08x drivers. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/clk.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <linux/platform_data/dma-ep93xx.h> + +#include "dmaengine.h" + +/* M2P registers */ +#define M2P_CONTROL 0x0000 +#define M2P_CONTROL_STALLINT BIT(0) +#define M2P_CONTROL_NFBINT BIT(1) +#define M2P_CONTROL_CH_ERROR_INT BIT(3) +#define M2P_CONTROL_ENABLE BIT(4) +#define M2P_CONTROL_ICE BIT(6) + +#define M2P_INTERRUPT 0x0004 +#define M2P_INTERRUPT_STALL BIT(0) +#define M2P_INTERRUPT_NFB BIT(1) +#define M2P_INTERRUPT_ERROR BIT(3) + +#define M2P_PPALLOC 0x0008 +#define M2P_STATUS 0x000c + +#define M2P_MAXCNT0 0x0020 +#define M2P_BASE0 0x0024 +#define M2P_MAXCNT1 0x0030 +#define M2P_BASE1 0x0034 + +#define M2P_STATE_IDLE 0 +#define M2P_STATE_STALL 1 +#define M2P_STATE_ON 2 +#define M2P_STATE_NEXT 3 + +/* M2M registers */ +#define M2M_CONTROL 0x0000 +#define M2M_CONTROL_DONEINT BIT(2) +#define M2M_CONTROL_ENABLE BIT(3) +#define M2M_CONTROL_START BIT(4) +#define M2M_CONTROL_DAH BIT(11) +#define M2M_CONTROL_SAH BIT(12) +#define M2M_CONTROL_PW_SHIFT 9 +#define M2M_CONTROL_PW_8 (0 << M2M_CONTROL_PW_SHIFT) +#define M2M_CONTROL_PW_16 (1 << M2M_CONTROL_PW_SHIFT) +#define M2M_CONTROL_PW_32 (2 << M2M_CONTROL_PW_SHIFT) +#define M2M_CONTROL_PW_MASK (3 << M2M_CONTROL_PW_SHIFT) +#define M2M_CONTROL_TM_SHIFT 13 +#define M2M_CONTROL_TM_TX (1 << M2M_CONTROL_TM_SHIFT) +#define M2M_CONTROL_TM_RX (2 << M2M_CONTROL_TM_SHIFT) +#define M2M_CONTROL_NFBINT BIT(21) +#define M2M_CONTROL_RSS_SHIFT 22 +#define M2M_CONTROL_RSS_SSPRX (1 << M2M_CONTROL_RSS_SHIFT) +#define M2M_CONTROL_RSS_SSPTX (2 << M2M_CONTROL_RSS_SHIFT) +#define M2M_CONTROL_RSS_IDE (3 << M2M_CONTROL_RSS_SHIFT) +#define M2M_CONTROL_NO_HDSK BIT(24) +#define M2M_CONTROL_PWSC_SHIFT 25 + +#define M2M_INTERRUPT 0x0004 +#define M2M_INTERRUPT_MASK 6 + +#define M2M_STATUS 0x000c +#define M2M_STATUS_CTL_SHIFT 1 +#define M2M_STATUS_CTL_IDLE (0 << M2M_STATUS_CTL_SHIFT) +#define M2M_STATUS_CTL_STALL (1 << M2M_STATUS_CTL_SHIFT) +#define M2M_STATUS_CTL_MEMRD (2 << M2M_STATUS_CTL_SHIFT) +#define M2M_STATUS_CTL_MEMWR (3 << M2M_STATUS_CTL_SHIFT) +#define M2M_STATUS_CTL_BWCWAIT (4 << M2M_STATUS_CTL_SHIFT) +#define M2M_STATUS_CTL_MASK (7 << M2M_STATUS_CTL_SHIFT) +#define M2M_STATUS_BUF_SHIFT 4 +#define M2M_STATUS_BUF_NO (0 << M2M_STATUS_BUF_SHIFT) +#define M2M_STATUS_BUF_ON (1 << M2M_STATUS_BUF_SHIFT) +#define M2M_STATUS_BUF_NEXT (2 << M2M_STATUS_BUF_SHIFT) +#define M2M_STATUS_BUF_MASK (3 << M2M_STATUS_BUF_SHIFT) +#define M2M_STATUS_DONE BIT(6) + +#define M2M_BCR0 0x0010 +#define M2M_BCR1 0x0014 +#define M2M_SAR_BASE0 0x0018 +#define M2M_SAR_BASE1 0x001c +#define M2M_DAR_BASE0 0x002c +#define M2M_DAR_BASE1 0x0030 + +#define DMA_MAX_CHAN_BYTES 0xffff +#define DMA_MAX_CHAN_DESCRIPTORS 32 + +struct ep93xx_dma_engine; + +/** + * struct ep93xx_dma_desc - EP93xx specific transaction descriptor + * @src_addr: source address of the transaction + * @dst_addr: destination address of the transaction + * @size: size of the transaction (in bytes) + * @complete: this descriptor is completed + * @txd: dmaengine API descriptor + * @tx_list: list of linked descriptors + * @node: link used for putting this into a channel queue + */ +struct ep93xx_dma_desc { + u32 src_addr; + u32 dst_addr; + size_t size; + bool complete; + struct dma_async_tx_descriptor txd; + struct list_head tx_list; + struct list_head node; +}; + +/** + * struct ep93xx_dma_chan - an EP93xx DMA M2P/M2M channel + * @chan: dmaengine API channel + * @edma: pointer to to the engine device + * @regs: memory mapped registers + * @irq: interrupt number of the channel + * @clk: clock used by this channel + * @tasklet: channel specific tasklet used for callbacks + * @lock: lock protecting the fields following + * @flags: flags for the channel + * @buffer: which buffer to use next (0/1) + * @active: flattened chain of descriptors currently being processed + * @queue: pending descriptors which are handled next + * @free_list: list of free descriptors which can be used + * @runtime_addr: physical address currently used as dest/src (M2M only). This + * is set via .device_config before slave operation is + * prepared + * @runtime_ctrl: M2M runtime values for the control register. + * + * As EP93xx DMA controller doesn't support real chained DMA descriptors we + * will have slightly different scheme here: @active points to a head of + * flattened DMA descriptor chain. + * + * @queue holds pending transactions. These are linked through the first + * descriptor in the chain. When a descriptor is moved to the @active queue, + * the first and chained descriptors are flattened into a single list. + * + * @chan.private holds pointer to &struct ep93xx_dma_data which contains + * necessary channel configuration information. For memcpy channels this must + * be %NULL. + */ +struct ep93xx_dma_chan { + struct dma_chan chan; + const struct ep93xx_dma_engine *edma; + void __iomem *regs; + int irq; + struct clk *clk; + struct tasklet_struct tasklet; + /* protects the fields following */ + spinlock_t lock; + unsigned long flags; +/* Channel is configured for cyclic transfers */ +#define EP93XX_DMA_IS_CYCLIC 0 + + int buffer; + struct list_head active; + struct list_head queue; + struct list_head free_list; + u32 runtime_addr; + u32 runtime_ctrl; +}; + +/** + * struct ep93xx_dma_engine - the EP93xx DMA engine instance + * @dma_dev: holds the dmaengine device + * @m2m: is this an M2M or M2P device + * @hw_setup: method which sets the channel up for operation + * @hw_shutdown: shuts the channel down and flushes whatever is left + * @hw_submit: pushes active descriptor(s) to the hardware + * @hw_interrupt: handle the interrupt + * @num_channels: number of channels for this instance + * @channels: array of channels + * + * There is one instance of this struct for the M2P channels and one for the + * M2M channels. hw_xxx() methods are used to perform operations which are + * different on M2M and M2P channels. These methods are called with channel + * lock held and interrupts disabled so they cannot sleep. + */ +struct ep93xx_dma_engine { + struct dma_device dma_dev; + bool m2m; + int (*hw_setup)(struct ep93xx_dma_chan *); + void (*hw_shutdown)(struct ep93xx_dma_chan *); + void (*hw_submit)(struct ep93xx_dma_chan *); + int (*hw_interrupt)(struct ep93xx_dma_chan *); +#define INTERRUPT_UNKNOWN 0 +#define INTERRUPT_DONE 1 +#define INTERRUPT_NEXT_BUFFER 2 + + size_t num_channels; + struct ep93xx_dma_chan channels[]; +}; + +static inline struct device *chan2dev(struct ep93xx_dma_chan *edmac) +{ + return &edmac->chan.dev->device; +} + +static struct ep93xx_dma_chan *to_ep93xx_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct ep93xx_dma_chan, chan); +} + +/** + * ep93xx_dma_set_active - set new active descriptor chain + * @edmac: channel + * @desc: head of the new active descriptor chain + * + * Sets @desc to be the head of the new active descriptor chain. This is the + * chain which is processed next. The active list must be empty before calling + * this function. + * + * Called with @edmac->lock held and interrupts disabled. + */ +static void ep93xx_dma_set_active(struct ep93xx_dma_chan *edmac, + struct ep93xx_dma_desc *desc) +{ + BUG_ON(!list_empty(&edmac->active)); + + list_add_tail(&desc->node, &edmac->active); + + /* Flatten the @desc->tx_list chain into @edmac->active list */ + while (!list_empty(&desc->tx_list)) { + struct ep93xx_dma_desc *d = list_first_entry(&desc->tx_list, + struct ep93xx_dma_desc, node); + + /* + * We copy the callback parameters from the first descriptor + * to all the chained descriptors. This way we can call the + * callback without having to find out the first descriptor in + * the chain. Useful for cyclic transfers. + */ + d->txd.callback = desc->txd.callback; + d->txd.callback_param = desc->txd.callback_param; + + list_move_tail(&d->node, &edmac->active); + } +} + +/* Called with @edmac->lock held and interrupts disabled */ +static struct ep93xx_dma_desc * +ep93xx_dma_get_active(struct ep93xx_dma_chan *edmac) +{ + if (list_empty(&edmac->active)) + return NULL; + + return list_first_entry(&edmac->active, struct ep93xx_dma_desc, node); +} + +/** + * ep93xx_dma_advance_active - advances to the next active descriptor + * @edmac: channel + * + * Function advances active descriptor to the next in the @edmac->active and + * returns %true if we still have descriptors in the chain to process. + * Otherwise returns %false. + * + * When the channel is in cyclic mode always returns %true. + * + * Called with @edmac->lock held and interrupts disabled. + */ +static bool ep93xx_dma_advance_active(struct ep93xx_dma_chan *edmac) +{ + struct ep93xx_dma_desc *desc; + + list_rotate_left(&edmac->active); + + if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) + return true; + + desc = ep93xx_dma_get_active(edmac); + if (!desc) + return false; + + /* + * If txd.cookie is set it means that we are back in the first + * descriptor in the chain and hence done with it. + */ + return !desc->txd.cookie; +} + +/* + * M2P DMA implementation + */ + +static void m2p_set_control(struct ep93xx_dma_chan *edmac, u32 control) +{ + writel(control, edmac->regs + M2P_CONTROL); + /* + * EP93xx User's Guide states that we must perform a dummy read after + * write to the control register. + */ + readl(edmac->regs + M2P_CONTROL); +} + +static int m2p_hw_setup(struct ep93xx_dma_chan *edmac) +{ + struct ep93xx_dma_data *data = edmac->chan.private; + u32 control; + + writel(data->port & 0xf, edmac->regs + M2P_PPALLOC); + + control = M2P_CONTROL_CH_ERROR_INT | M2P_CONTROL_ICE + | M2P_CONTROL_ENABLE; + m2p_set_control(edmac, control); + + return 0; +} + +static inline u32 m2p_channel_state(struct ep93xx_dma_chan *edmac) +{ + return (readl(edmac->regs + M2P_STATUS) >> 4) & 0x3; +} + +static void m2p_hw_shutdown(struct ep93xx_dma_chan *edmac) +{ + u32 control; + + control = readl(edmac->regs + M2P_CONTROL); + control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT); + m2p_set_control(edmac, control); + + while (m2p_channel_state(edmac) >= M2P_STATE_ON) + cpu_relax(); + + m2p_set_control(edmac, 0); + + while (m2p_channel_state(edmac) == M2P_STATE_STALL) + cpu_relax(); +} + +static void m2p_fill_desc(struct ep93xx_dma_chan *edmac) +{ + struct ep93xx_dma_desc *desc; + u32 bus_addr; + + desc = ep93xx_dma_get_active(edmac); + if (!desc) { + dev_warn(chan2dev(edmac), "M2P: empty descriptor list\n"); + return; + } + + if (ep93xx_dma_chan_direction(&edmac->chan) == DMA_MEM_TO_DEV) + bus_addr = desc->src_addr; + else + bus_addr = desc->dst_addr; + + if (edmac->buffer == 0) { + writel(desc->size, edmac->regs + M2P_MAXCNT0); + writel(bus_addr, edmac->regs + M2P_BASE0); + } else { + writel(desc->size, edmac->regs + M2P_MAXCNT1); + writel(bus_addr, edmac->regs + M2P_BASE1); + } + + edmac->buffer ^= 1; +} + +static void m2p_hw_submit(struct ep93xx_dma_chan *edmac) +{ + u32 control = readl(edmac->regs + M2P_CONTROL); + + m2p_fill_desc(edmac); + control |= M2P_CONTROL_STALLINT; + + if (ep93xx_dma_advance_active(edmac)) { + m2p_fill_desc(edmac); + control |= M2P_CONTROL_NFBINT; + } + + m2p_set_control(edmac, control); +} + +static int m2p_hw_interrupt(struct ep93xx_dma_chan *edmac) +{ + u32 irq_status = readl(edmac->regs + M2P_INTERRUPT); + u32 control; + + if (irq_status & M2P_INTERRUPT_ERROR) { + struct ep93xx_dma_desc *desc = ep93xx_dma_get_active(edmac); + + /* Clear the error interrupt */ + writel(1, edmac->regs + M2P_INTERRUPT); + + /* + * It seems that there is no easy way of reporting errors back + * to client so we just report the error here and continue as + * usual. + * + * Revisit this when there is a mechanism to report back the + * errors. + */ + dev_err(chan2dev(edmac), + "DMA transfer failed! Details:\n" + "\tcookie : %d\n" + "\tsrc_addr : 0x%08x\n" + "\tdst_addr : 0x%08x\n" + "\tsize : %zu\n", + desc->txd.cookie, desc->src_addr, desc->dst_addr, + desc->size); + } + + switch (irq_status & (M2P_INTERRUPT_STALL | M2P_INTERRUPT_NFB)) { + case M2P_INTERRUPT_STALL: + /* Disable interrupts */ + control = readl(edmac->regs + M2P_CONTROL); + control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT); + m2p_set_control(edmac, control); + + return INTERRUPT_DONE; + + case M2P_INTERRUPT_NFB: + if (ep93xx_dma_advance_active(edmac)) + m2p_fill_desc(edmac); + + return INTERRUPT_NEXT_BUFFER; + } + + return INTERRUPT_UNKNOWN; +} + +/* + * M2M DMA implementation + */ + +static int m2m_hw_setup(struct ep93xx_dma_chan *edmac) +{ + const struct ep93xx_dma_data *data = edmac->chan.private; + u32 control = 0; + + if (!data) { + /* This is memcpy channel, nothing to configure */ + writel(control, edmac->regs + M2M_CONTROL); + return 0; + } + + switch (data->port) { + case EP93XX_DMA_SSP: + /* + * This was found via experimenting - anything less than 5 + * causes the channel to perform only a partial transfer which + * leads to problems since we don't get DONE interrupt then. + */ + control = (5 << M2M_CONTROL_PWSC_SHIFT); + control |= M2M_CONTROL_NO_HDSK; + + if (data->direction == DMA_MEM_TO_DEV) { + control |= M2M_CONTROL_DAH; + control |= M2M_CONTROL_TM_TX; + control |= M2M_CONTROL_RSS_SSPTX; + } else { + control |= M2M_CONTROL_SAH; + control |= M2M_CONTROL_TM_RX; + control |= M2M_CONTROL_RSS_SSPRX; + } + break; + + case EP93XX_DMA_IDE: + /* + * This IDE part is totally untested. Values below are taken + * from the EP93xx Users's Guide and might not be correct. + */ + if (data->direction == DMA_MEM_TO_DEV) { + /* Worst case from the UG */ + control = (3 << M2M_CONTROL_PWSC_SHIFT); + control |= M2M_CONTROL_DAH; + control |= M2M_CONTROL_TM_TX; + } else { + control = (2 << M2M_CONTROL_PWSC_SHIFT); + control |= M2M_CONTROL_SAH; + control |= M2M_CONTROL_TM_RX; + } + + control |= M2M_CONTROL_NO_HDSK; + control |= M2M_CONTROL_RSS_IDE; + control |= M2M_CONTROL_PW_16; + break; + + default: + return -EINVAL; + } + + writel(control, edmac->regs + M2M_CONTROL); + return 0; +} + +static void m2m_hw_shutdown(struct ep93xx_dma_chan *edmac) +{ + /* Just disable the channel */ + writel(0, edmac->regs + M2M_CONTROL); +} + +static void m2m_fill_desc(struct ep93xx_dma_chan *edmac) +{ + struct ep93xx_dma_desc *desc; + + desc = ep93xx_dma_get_active(edmac); + if (!desc) { + dev_warn(chan2dev(edmac), "M2M: empty descriptor list\n"); + return; + } + + if (edmac->buffer == 0) { + writel(desc->src_addr, edmac->regs + M2M_SAR_BASE0); + writel(desc->dst_addr, edmac->regs + M2M_DAR_BASE0); + writel(desc->size, edmac->regs + M2M_BCR0); + } else { + writel(desc->src_addr, edmac->regs + M2M_SAR_BASE1); + writel(desc->dst_addr, edmac->regs + M2M_DAR_BASE1); + writel(desc->size, edmac->regs + M2M_BCR1); + } + + edmac->buffer ^= 1; +} + +static void m2m_hw_submit(struct ep93xx_dma_chan *edmac) +{ + struct ep93xx_dma_data *data = edmac->chan.private; + u32 control = readl(edmac->regs + M2M_CONTROL); + + /* + * Since we allow clients to configure PW (peripheral width) we always + * clear PW bits here and then set them according what is given in + * the runtime configuration. + */ + control &= ~M2M_CONTROL_PW_MASK; + control |= edmac->runtime_ctrl; + + m2m_fill_desc(edmac); + control |= M2M_CONTROL_DONEINT; + + if (ep93xx_dma_advance_active(edmac)) { + m2m_fill_desc(edmac); + control |= M2M_CONTROL_NFBINT; + } + + /* + * Now we can finally enable the channel. For M2M channel this must be + * done _after_ the BCRx registers are programmed. + */ + control |= M2M_CONTROL_ENABLE; + writel(control, edmac->regs + M2M_CONTROL); + + if (!data) { + /* + * For memcpy channels the software trigger must be asserted + * in order to start the memcpy operation. + */ + control |= M2M_CONTROL_START; + writel(control, edmac->regs + M2M_CONTROL); + } +} + +/* + * According to EP93xx User's Guide, we should receive DONE interrupt when all + * M2M DMA controller transactions complete normally. This is not always the + * case - sometimes EP93xx M2M DMA asserts DONE interrupt when the DMA channel + * is still running (channel Buffer FSM in DMA_BUF_ON state, and channel + * Control FSM in DMA_MEM_RD state, observed at least in IDE-DMA operation). + * In effect, disabling the channel when only DONE bit is set could stop + * currently running DMA transfer. To avoid this, we use Buffer FSM and + * Control FSM to check current state of DMA channel. + */ +static int m2m_hw_interrupt(struct ep93xx_dma_chan *edmac) +{ + u32 status = readl(edmac->regs + M2M_STATUS); + u32 ctl_fsm = status & M2M_STATUS_CTL_MASK; + u32 buf_fsm = status & M2M_STATUS_BUF_MASK; + bool done = status & M2M_STATUS_DONE; + bool last_done; + u32 control; + struct ep93xx_dma_desc *desc; + + /* Accept only DONE and NFB interrupts */ + if (!(readl(edmac->regs + M2M_INTERRUPT) & M2M_INTERRUPT_MASK)) + return INTERRUPT_UNKNOWN; + + if (done) { + /* Clear the DONE bit */ + writel(0, edmac->regs + M2M_INTERRUPT); + } + + /* + * Check whether we are done with descriptors or not. This, together + * with DMA channel state, determines action to take in interrupt. + */ + desc = ep93xx_dma_get_active(edmac); + last_done = !desc || desc->txd.cookie; + + /* + * Use M2M DMA Buffer FSM and Control FSM to check current state of + * DMA channel. Using DONE and NFB bits from channel status register + * or bits from channel interrupt register is not reliable. + */ + if (!last_done && + (buf_fsm == M2M_STATUS_BUF_NO || + buf_fsm == M2M_STATUS_BUF_ON)) { + /* + * Two buffers are ready for update when Buffer FSM is in + * DMA_NO_BUF state. Only one buffer can be prepared without + * disabling the channel or polling the DONE bit. + * To simplify things, always prepare only one buffer. + */ + if (ep93xx_dma_advance_active(edmac)) { + m2m_fill_desc(edmac); + if (done && !edmac->chan.private) { + /* Software trigger for memcpy channel */ + control = readl(edmac->regs + M2M_CONTROL); + control |= M2M_CONTROL_START; + writel(control, edmac->regs + M2M_CONTROL); + } + return INTERRUPT_NEXT_BUFFER; + } else { + last_done = true; + } + } + + /* + * Disable the channel only when Buffer FSM is in DMA_NO_BUF state + * and Control FSM is in DMA_STALL state. + */ + if (last_done && + buf_fsm == M2M_STATUS_BUF_NO && + ctl_fsm == M2M_STATUS_CTL_STALL) { + /* Disable interrupts and the channel */ + control = readl(edmac->regs + M2M_CONTROL); + control &= ~(M2M_CONTROL_DONEINT | M2M_CONTROL_NFBINT + | M2M_CONTROL_ENABLE); + writel(control, edmac->regs + M2M_CONTROL); + return INTERRUPT_DONE; + } + + /* + * Nothing to do this time. + */ + return INTERRUPT_NEXT_BUFFER; +} + +/* + * DMA engine API implementation + */ + +static struct ep93xx_dma_desc * +ep93xx_dma_desc_get(struct ep93xx_dma_chan *edmac) +{ + struct ep93xx_dma_desc *desc, *_desc; + struct ep93xx_dma_desc *ret = NULL; + unsigned long flags; + + spin_lock_irqsave(&edmac->lock, flags); + list_for_each_entry_safe(desc, _desc, &edmac->free_list, node) { + if (async_tx_test_ack(&desc->txd)) { + list_del_init(&desc->node); + + /* Re-initialize the descriptor */ + desc->src_addr = 0; + desc->dst_addr = 0; + desc->size = 0; + desc->complete = false; + desc->txd.cookie = 0; + desc->txd.callback = NULL; + desc->txd.callback_param = NULL; + + ret = desc; + break; + } + } + spin_unlock_irqrestore(&edmac->lock, flags); + return ret; +} + +static void ep93xx_dma_desc_put(struct ep93xx_dma_chan *edmac, + struct ep93xx_dma_desc *desc) +{ + if (desc) { + unsigned long flags; + + spin_lock_irqsave(&edmac->lock, flags); + list_splice_init(&desc->tx_list, &edmac->free_list); + list_add(&desc->node, &edmac->free_list); + spin_unlock_irqrestore(&edmac->lock, flags); + } +} + +/** + * ep93xx_dma_advance_work - start processing the next pending transaction + * @edmac: channel + * + * If we have pending transactions queued and we are currently idling, this + * function takes the next queued transaction from the @edmac->queue and + * pushes it to the hardware for execution. + */ +static void ep93xx_dma_advance_work(struct ep93xx_dma_chan *edmac) +{ + struct ep93xx_dma_desc *new; + unsigned long flags; + + spin_lock_irqsave(&edmac->lock, flags); + if (!list_empty(&edmac->active) || list_empty(&edmac->queue)) { + spin_unlock_irqrestore(&edmac->lock, flags); + return; + } + + /* Take the next descriptor from the pending queue */ + new = list_first_entry(&edmac->queue, struct ep93xx_dma_desc, node); + list_del_init(&new->node); + + ep93xx_dma_set_active(edmac, new); + + /* Push it to the hardware */ + edmac->edma->hw_submit(edmac); + spin_unlock_irqrestore(&edmac->lock, flags); +} + +static void ep93xx_dma_tasklet(unsigned long data) +{ + struct ep93xx_dma_chan *edmac = (struct ep93xx_dma_chan *)data; + struct ep93xx_dma_desc *desc, *d; + dma_async_tx_callback callback = NULL; + void *callback_param = NULL; + LIST_HEAD(list); + + spin_lock_irq(&edmac->lock); + /* + * If dma_terminate_all() was called before we get to run, the active + * list has become empty. If that happens we aren't supposed to do + * anything more than call ep93xx_dma_advance_work(). + */ + desc = ep93xx_dma_get_active(edmac); + if (desc) { + if (desc->complete) { + /* mark descriptor complete for non cyclic case only */ + if (!test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) + dma_cookie_complete(&desc->txd); + list_splice_init(&edmac->active, &list); + } + callback = desc->txd.callback; + callback_param = desc->txd.callback_param; + } + spin_unlock_irq(&edmac->lock); + + /* Pick up the next descriptor from the queue */ + ep93xx_dma_advance_work(edmac); + + /* Now we can release all the chained descriptors */ + list_for_each_entry_safe(desc, d, &list, node) { + dma_descriptor_unmap(&desc->txd); + ep93xx_dma_desc_put(edmac, desc); + } + + if (callback) + callback(callback_param); +} + +static irqreturn_t ep93xx_dma_interrupt(int irq, void *dev_id) +{ + struct ep93xx_dma_chan *edmac = dev_id; + struct ep93xx_dma_desc *desc; + irqreturn_t ret = IRQ_HANDLED; + + spin_lock(&edmac->lock); + + desc = ep93xx_dma_get_active(edmac); + if (!desc) { + dev_warn(chan2dev(edmac), + "got interrupt while active list is empty\n"); + spin_unlock(&edmac->lock); + return IRQ_NONE; + } + + switch (edmac->edma->hw_interrupt(edmac)) { + case INTERRUPT_DONE: + desc->complete = true; + tasklet_schedule(&edmac->tasklet); + break; + + case INTERRUPT_NEXT_BUFFER: + if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) + tasklet_schedule(&edmac->tasklet); + break; + + default: + dev_warn(chan2dev(edmac), "unknown interrupt!\n"); + ret = IRQ_NONE; + break; + } + + spin_unlock(&edmac->lock); + return ret; +} + +/** + * ep93xx_dma_tx_submit - set the prepared descriptor(s) to be executed + * @tx: descriptor to be executed + * + * Function will execute given descriptor on the hardware or if the hardware + * is busy, queue the descriptor to be executed later on. Returns cookie which + * can be used to poll the status of the descriptor. + */ +static dma_cookie_t ep93xx_dma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(tx->chan); + struct ep93xx_dma_desc *desc; + dma_cookie_t cookie; + unsigned long flags; + + spin_lock_irqsave(&edmac->lock, flags); + cookie = dma_cookie_assign(tx); + + desc = container_of(tx, struct ep93xx_dma_desc, txd); + + /* + * If nothing is currently prosessed, we push this descriptor + * directly to the hardware. Otherwise we put the descriptor + * to the pending queue. + */ + if (list_empty(&edmac->active)) { + ep93xx_dma_set_active(edmac, desc); + edmac->edma->hw_submit(edmac); + } else { + list_add_tail(&desc->node, &edmac->queue); + } + + spin_unlock_irqrestore(&edmac->lock, flags); + return cookie; +} + +/** + * ep93xx_dma_alloc_chan_resources - allocate resources for the channel + * @chan: channel to allocate resources + * + * Function allocates necessary resources for the given DMA channel and + * returns number of allocated descriptors for the channel. Negative errno + * is returned in case of failure. + */ +static int ep93xx_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); + struct ep93xx_dma_data *data = chan->private; + const char *name = dma_chan_name(chan); + int ret, i; + + /* Sanity check the channel parameters */ + if (!edmac->edma->m2m) { + if (!data) + return -EINVAL; + if (data->port < EP93XX_DMA_I2S1 || + data->port > EP93XX_DMA_IRDA) + return -EINVAL; + if (data->direction != ep93xx_dma_chan_direction(chan)) + return -EINVAL; + } else { + if (data) { + switch (data->port) { + case EP93XX_DMA_SSP: + case EP93XX_DMA_IDE: + if (!is_slave_direction(data->direction)) + return -EINVAL; + break; + default: + return -EINVAL; + } + } + } + + if (data && data->name) + name = data->name; + + ret = clk_enable(edmac->clk); + if (ret) + return ret; + + ret = request_irq(edmac->irq, ep93xx_dma_interrupt, 0, name, edmac); + if (ret) + goto fail_clk_disable; + + spin_lock_irq(&edmac->lock); + dma_cookie_init(&edmac->chan); + ret = edmac->edma->hw_setup(edmac); + spin_unlock_irq(&edmac->lock); + + if (ret) + goto fail_free_irq; + + for (i = 0; i < DMA_MAX_CHAN_DESCRIPTORS; i++) { + struct ep93xx_dma_desc *desc; + + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) { + dev_warn(chan2dev(edmac), "not enough descriptors\n"); + break; + } + + INIT_LIST_HEAD(&desc->tx_list); + + dma_async_tx_descriptor_init(&desc->txd, chan); + desc->txd.flags = DMA_CTRL_ACK; + desc->txd.tx_submit = ep93xx_dma_tx_submit; + + ep93xx_dma_desc_put(edmac, desc); + } + + return i; + +fail_free_irq: + free_irq(edmac->irq, edmac); +fail_clk_disable: + clk_disable(edmac->clk); + + return ret; +} + +/** + * ep93xx_dma_free_chan_resources - release resources for the channel + * @chan: channel + * + * Function releases all the resources allocated for the given channel. + * The channel must be idle when this is called. + */ +static void ep93xx_dma_free_chan_resources(struct dma_chan *chan) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); + struct ep93xx_dma_desc *desc, *d; + unsigned long flags; + LIST_HEAD(list); + + BUG_ON(!list_empty(&edmac->active)); + BUG_ON(!list_empty(&edmac->queue)); + + spin_lock_irqsave(&edmac->lock, flags); + edmac->edma->hw_shutdown(edmac); + edmac->runtime_addr = 0; + edmac->runtime_ctrl = 0; + edmac->buffer = 0; + list_splice_init(&edmac->free_list, &list); + spin_unlock_irqrestore(&edmac->lock, flags); + + list_for_each_entry_safe(desc, d, &list, node) + kfree(desc); + + clk_disable(edmac->clk); + free_irq(edmac->irq, edmac); +} + +/** + * ep93xx_dma_prep_dma_memcpy - prepare a memcpy DMA operation + * @chan: channel + * @dest: destination bus address + * @src: source bus address + * @len: size of the transaction + * @flags: flags for the descriptor + * + * Returns a valid DMA descriptor or %NULL in case of failure. + */ +static struct dma_async_tx_descriptor * +ep93xx_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, + dma_addr_t src, size_t len, unsigned long flags) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); + struct ep93xx_dma_desc *desc, *first; + size_t bytes, offset; + + first = NULL; + for (offset = 0; offset < len; offset += bytes) { + desc = ep93xx_dma_desc_get(edmac); + if (!desc) { + dev_warn(chan2dev(edmac), "couln't get descriptor\n"); + goto fail; + } + + bytes = min_t(size_t, len - offset, DMA_MAX_CHAN_BYTES); + + desc->src_addr = src + offset; + desc->dst_addr = dest + offset; + desc->size = bytes; + + if (!first) + first = desc; + else + list_add_tail(&desc->node, &first->tx_list); + } + + first->txd.cookie = -EBUSY; + first->txd.flags = flags; + + return &first->txd; +fail: + ep93xx_dma_desc_put(edmac, first); + return NULL; +} + +/** + * ep93xx_dma_prep_slave_sg - prepare a slave DMA operation + * @chan: channel + * @sgl: list of buffers to transfer + * @sg_len: number of entries in @sgl + * @dir: direction of tha DMA transfer + * @flags: flags for the descriptor + * @context: operation context (ignored) + * + * Returns a valid DMA descriptor or %NULL in case of failure. + */ +static struct dma_async_tx_descriptor * +ep93xx_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction dir, + unsigned long flags, void *context) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); + struct ep93xx_dma_desc *desc, *first; + struct scatterlist *sg; + int i; + + if (!edmac->edma->m2m && dir != ep93xx_dma_chan_direction(chan)) { + dev_warn(chan2dev(edmac), + "channel was configured with different direction\n"); + return NULL; + } + + if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) { + dev_warn(chan2dev(edmac), + "channel is already used for cyclic transfers\n"); + return NULL; + } + + first = NULL; + for_each_sg(sgl, sg, sg_len, i) { + size_t sg_len = sg_dma_len(sg); + + if (sg_len > DMA_MAX_CHAN_BYTES) { + dev_warn(chan2dev(edmac), "too big transfer size %d\n", + sg_len); + goto fail; + } + + desc = ep93xx_dma_desc_get(edmac); + if (!desc) { + dev_warn(chan2dev(edmac), "couln't get descriptor\n"); + goto fail; + } + + if (dir == DMA_MEM_TO_DEV) { + desc->src_addr = sg_dma_address(sg); + desc->dst_addr = edmac->runtime_addr; + } else { + desc->src_addr = edmac->runtime_addr; + desc->dst_addr = sg_dma_address(sg); + } + desc->size = sg_len; + + if (!first) + first = desc; + else + list_add_tail(&desc->node, &first->tx_list); + } + + first->txd.cookie = -EBUSY; + first->txd.flags = flags; + + return &first->txd; + +fail: + ep93xx_dma_desc_put(edmac, first); + return NULL; +} + +/** + * ep93xx_dma_prep_dma_cyclic - prepare a cyclic DMA operation + * @chan: channel + * @dma_addr: DMA mapped address of the buffer + * @buf_len: length of the buffer (in bytes) + * @period_len: length of a single period + * @dir: direction of the operation + * @flags: tx descriptor status flags + * + * Prepares a descriptor for cyclic DMA operation. This means that once the + * descriptor is submitted, we will be submitting in a @period_len sized + * buffers and calling callback once the period has been elapsed. Transfer + * terminates only when client calls dmaengine_terminate_all() for this + * channel. + * + * Returns a valid DMA descriptor or %NULL in case of failure. + */ +static struct dma_async_tx_descriptor * +ep93xx_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr, + size_t buf_len, size_t period_len, + enum dma_transfer_direction dir, unsigned long flags) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); + struct ep93xx_dma_desc *desc, *first; + size_t offset = 0; + + if (!edmac->edma->m2m && dir != ep93xx_dma_chan_direction(chan)) { + dev_warn(chan2dev(edmac), + "channel was configured with different direction\n"); + return NULL; + } + + if (test_and_set_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) { + dev_warn(chan2dev(edmac), + "channel is already used for cyclic transfers\n"); + return NULL; + } + + if (period_len > DMA_MAX_CHAN_BYTES) { + dev_warn(chan2dev(edmac), "too big period length %d\n", + period_len); + return NULL; + } + + /* Split the buffer into period size chunks */ + first = NULL; + for (offset = 0; offset < buf_len; offset += period_len) { + desc = ep93xx_dma_desc_get(edmac); + if (!desc) { + dev_warn(chan2dev(edmac), "couln't get descriptor\n"); + goto fail; + } + + if (dir == DMA_MEM_TO_DEV) { + desc->src_addr = dma_addr + offset; + desc->dst_addr = edmac->runtime_addr; + } else { + desc->src_addr = edmac->runtime_addr; + desc->dst_addr = dma_addr + offset; + } + + desc->size = period_len; + + if (!first) + first = desc; + else + list_add_tail(&desc->node, &first->tx_list); + } + + first->txd.cookie = -EBUSY; + + return &first->txd; + +fail: + ep93xx_dma_desc_put(edmac, first); + return NULL; +} + +/** + * ep93xx_dma_terminate_all - terminate all transactions + * @chan: channel + * + * Stops all DMA transactions. All descriptors are put back to the + * @edmac->free_list and callbacks are _not_ called. + */ +static int ep93xx_dma_terminate_all(struct dma_chan *chan) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); + struct ep93xx_dma_desc *desc, *_d; + unsigned long flags; + LIST_HEAD(list); + + spin_lock_irqsave(&edmac->lock, flags); + /* First we disable and flush the DMA channel */ + edmac->edma->hw_shutdown(edmac); + clear_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags); + list_splice_init(&edmac->active, &list); + list_splice_init(&edmac->queue, &list); + /* + * We then re-enable the channel. This way we can continue submitting + * the descriptors by just calling ->hw_submit() again. + */ + edmac->edma->hw_setup(edmac); + spin_unlock_irqrestore(&edmac->lock, flags); + + list_for_each_entry_safe(desc, _d, &list, node) + ep93xx_dma_desc_put(edmac, desc); + + return 0; +} + +static int ep93xx_dma_slave_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan); + enum dma_slave_buswidth width; + unsigned long flags; + u32 addr, ctrl; + + if (!edmac->edma->m2m) + return -EINVAL; + + switch (config->direction) { + case DMA_DEV_TO_MEM: + width = config->src_addr_width; + addr = config->src_addr; + break; + + case DMA_MEM_TO_DEV: + width = config->dst_addr_width; + addr = config->dst_addr; + break; + + default: + return -EINVAL; + } + + switch (width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + ctrl = 0; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + ctrl = M2M_CONTROL_PW_16; + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + ctrl = M2M_CONTROL_PW_32; + break; + default: + return -EINVAL; + } + + spin_lock_irqsave(&edmac->lock, flags); + edmac->runtime_addr = addr; + edmac->runtime_ctrl = ctrl; + spin_unlock_irqrestore(&edmac->lock, flags); + + return 0; +} + +/** + * ep93xx_dma_tx_status - check if a transaction is completed + * @chan: channel + * @cookie: transaction specific cookie + * @state: state of the transaction is stored here if given + * + * This function can be used to query state of a given transaction. + */ +static enum dma_status ep93xx_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *state) +{ + return dma_cookie_status(chan, cookie, state); +} + +/** + * ep93xx_dma_issue_pending - push pending transactions to the hardware + * @chan: channel + * + * When this function is called, all pending transactions are pushed to the + * hardware and executed. + */ +static void ep93xx_dma_issue_pending(struct dma_chan *chan) +{ + ep93xx_dma_advance_work(to_ep93xx_dma_chan(chan)); +} + +static int __init ep93xx_dma_probe(struct platform_device *pdev) +{ + struct ep93xx_dma_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct ep93xx_dma_engine *edma; + struct dma_device *dma_dev; + size_t edma_size; + int ret, i; + + edma_size = pdata->num_channels * sizeof(struct ep93xx_dma_chan); + edma = kzalloc(sizeof(*edma) + edma_size, GFP_KERNEL); + if (!edma) + return -ENOMEM; + + dma_dev = &edma->dma_dev; + edma->m2m = platform_get_device_id(pdev)->driver_data; + edma->num_channels = pdata->num_channels; + + INIT_LIST_HEAD(&dma_dev->channels); + for (i = 0; i < pdata->num_channels; i++) { + const struct ep93xx_dma_chan_data *cdata = &pdata->channels[i]; + struct ep93xx_dma_chan *edmac = &edma->channels[i]; + + edmac->chan.device = dma_dev; + edmac->regs = cdata->base; + edmac->irq = cdata->irq; + edmac->edma = edma; + + edmac->clk = clk_get(NULL, cdata->name); + if (IS_ERR(edmac->clk)) { + dev_warn(&pdev->dev, "failed to get clock for %s\n", + cdata->name); + continue; + } + + spin_lock_init(&edmac->lock); + INIT_LIST_HEAD(&edmac->active); + INIT_LIST_HEAD(&edmac->queue); + INIT_LIST_HEAD(&edmac->free_list); + tasklet_init(&edmac->tasklet, ep93xx_dma_tasklet, + (unsigned long)edmac); + + list_add_tail(&edmac->chan.device_node, + &dma_dev->channels); + } + + dma_cap_zero(dma_dev->cap_mask); + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + dma_cap_set(DMA_CYCLIC, dma_dev->cap_mask); + + dma_dev->dev = &pdev->dev; + dma_dev->device_alloc_chan_resources = ep93xx_dma_alloc_chan_resources; + dma_dev->device_free_chan_resources = ep93xx_dma_free_chan_resources; + dma_dev->device_prep_slave_sg = ep93xx_dma_prep_slave_sg; + dma_dev->device_prep_dma_cyclic = ep93xx_dma_prep_dma_cyclic; + dma_dev->device_config = ep93xx_dma_slave_config; + dma_dev->device_terminate_all = ep93xx_dma_terminate_all; + dma_dev->device_issue_pending = ep93xx_dma_issue_pending; + dma_dev->device_tx_status = ep93xx_dma_tx_status; + + dma_set_max_seg_size(dma_dev->dev, DMA_MAX_CHAN_BYTES); + + if (edma->m2m) { + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + dma_dev->device_prep_dma_memcpy = ep93xx_dma_prep_dma_memcpy; + + edma->hw_setup = m2m_hw_setup; + edma->hw_shutdown = m2m_hw_shutdown; + edma->hw_submit = m2m_hw_submit; + edma->hw_interrupt = m2m_hw_interrupt; + } else { + dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask); + + edma->hw_setup = m2p_hw_setup; + edma->hw_shutdown = m2p_hw_shutdown; + edma->hw_submit = m2p_hw_submit; + edma->hw_interrupt = m2p_hw_interrupt; + } + + ret = dma_async_device_register(dma_dev); + if (unlikely(ret)) { + for (i = 0; i < edma->num_channels; i++) { + struct ep93xx_dma_chan *edmac = &edma->channels[i]; + if (!IS_ERR_OR_NULL(edmac->clk)) + clk_put(edmac->clk); + } + kfree(edma); + } else { + dev_info(dma_dev->dev, "EP93xx M2%s DMA ready\n", + edma->m2m ? "M" : "P"); + } + + return ret; +} + +static struct platform_device_id ep93xx_dma_driver_ids[] = { + { "ep93xx-dma-m2p", 0 }, + { "ep93xx-dma-m2m", 1 }, + { }, +}; + +static struct platform_driver ep93xx_dma_driver = { + .driver = { + .name = "ep93xx-dma", + }, + .id_table = ep93xx_dma_driver_ids, +}; + +static int __init ep93xx_dma_module_init(void) +{ + return platform_driver_probe(&ep93xx_dma_driver, ep93xx_dma_probe); +} +subsys_initcall(ep93xx_dma_module_init); + +MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>"); +MODULE_DESCRIPTION("EP93xx DMA driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c new file mode 100644 index 000000000..09e2842d1 --- /dev/null +++ b/drivers/dma/fsl-edma.c @@ -0,0 +1,990 @@ +/* + * drivers/dma/fsl-edma.c + * + * Copyright 2013-2014 Freescale Semiconductor, Inc. + * + * Driver for the Freescale eDMA engine with flexible channel multiplexing + * capability for DMA request sources. The eDMA block can be found on some + * Vybrid and Layerscape SoCs. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_dma.h> + +#include "virt-dma.h" + +#define EDMA_CR 0x00 +#define EDMA_ES 0x04 +#define EDMA_ERQ 0x0C +#define EDMA_EEI 0x14 +#define EDMA_SERQ 0x1B +#define EDMA_CERQ 0x1A +#define EDMA_SEEI 0x19 +#define EDMA_CEEI 0x18 +#define EDMA_CINT 0x1F +#define EDMA_CERR 0x1E +#define EDMA_SSRT 0x1D +#define EDMA_CDNE 0x1C +#define EDMA_INTR 0x24 +#define EDMA_ERR 0x2C + +#define EDMA_TCD_SADDR(x) (0x1000 + 32 * (x)) +#define EDMA_TCD_SOFF(x) (0x1004 + 32 * (x)) +#define EDMA_TCD_ATTR(x) (0x1006 + 32 * (x)) +#define EDMA_TCD_NBYTES(x) (0x1008 + 32 * (x)) +#define EDMA_TCD_SLAST(x) (0x100C + 32 * (x)) +#define EDMA_TCD_DADDR(x) (0x1010 + 32 * (x)) +#define EDMA_TCD_DOFF(x) (0x1014 + 32 * (x)) +#define EDMA_TCD_CITER_ELINK(x) (0x1016 + 32 * (x)) +#define EDMA_TCD_CITER(x) (0x1016 + 32 * (x)) +#define EDMA_TCD_DLAST_SGA(x) (0x1018 + 32 * (x)) +#define EDMA_TCD_CSR(x) (0x101C + 32 * (x)) +#define EDMA_TCD_BITER_ELINK(x) (0x101E + 32 * (x)) +#define EDMA_TCD_BITER(x) (0x101E + 32 * (x)) + +#define EDMA_CR_EDBG BIT(1) +#define EDMA_CR_ERCA BIT(2) +#define EDMA_CR_ERGA BIT(3) +#define EDMA_CR_HOE BIT(4) +#define EDMA_CR_HALT BIT(5) +#define EDMA_CR_CLM BIT(6) +#define EDMA_CR_EMLM BIT(7) +#define EDMA_CR_ECX BIT(16) +#define EDMA_CR_CX BIT(17) + +#define EDMA_SEEI_SEEI(x) ((x) & 0x1F) +#define EDMA_CEEI_CEEI(x) ((x) & 0x1F) +#define EDMA_CINT_CINT(x) ((x) & 0x1F) +#define EDMA_CERR_CERR(x) ((x) & 0x1F) + +#define EDMA_TCD_ATTR_DSIZE(x) (((x) & 0x0007)) +#define EDMA_TCD_ATTR_DMOD(x) (((x) & 0x001F) << 3) +#define EDMA_TCD_ATTR_SSIZE(x) (((x) & 0x0007) << 8) +#define EDMA_TCD_ATTR_SMOD(x) (((x) & 0x001F) << 11) +#define EDMA_TCD_ATTR_SSIZE_8BIT (0x0000) +#define EDMA_TCD_ATTR_SSIZE_16BIT (0x0100) +#define EDMA_TCD_ATTR_SSIZE_32BIT (0x0200) +#define EDMA_TCD_ATTR_SSIZE_64BIT (0x0300) +#define EDMA_TCD_ATTR_SSIZE_32BYTE (0x0500) +#define EDMA_TCD_ATTR_DSIZE_8BIT (0x0000) +#define EDMA_TCD_ATTR_DSIZE_16BIT (0x0001) +#define EDMA_TCD_ATTR_DSIZE_32BIT (0x0002) +#define EDMA_TCD_ATTR_DSIZE_64BIT (0x0003) +#define EDMA_TCD_ATTR_DSIZE_32BYTE (0x0005) + +#define EDMA_TCD_SOFF_SOFF(x) (x) +#define EDMA_TCD_NBYTES_NBYTES(x) (x) +#define EDMA_TCD_SLAST_SLAST(x) (x) +#define EDMA_TCD_DADDR_DADDR(x) (x) +#define EDMA_TCD_CITER_CITER(x) ((x) & 0x7FFF) +#define EDMA_TCD_DOFF_DOFF(x) (x) +#define EDMA_TCD_DLAST_SGA_DLAST_SGA(x) (x) +#define EDMA_TCD_BITER_BITER(x) ((x) & 0x7FFF) + +#define EDMA_TCD_CSR_START BIT(0) +#define EDMA_TCD_CSR_INT_MAJOR BIT(1) +#define EDMA_TCD_CSR_INT_HALF BIT(2) +#define EDMA_TCD_CSR_D_REQ BIT(3) +#define EDMA_TCD_CSR_E_SG BIT(4) +#define EDMA_TCD_CSR_E_LINK BIT(5) +#define EDMA_TCD_CSR_ACTIVE BIT(6) +#define EDMA_TCD_CSR_DONE BIT(7) + +#define EDMAMUX_CHCFG_DIS 0x0 +#define EDMAMUX_CHCFG_ENBL 0x80 +#define EDMAMUX_CHCFG_SOURCE(n) ((n) & 0x3F) + +#define DMAMUX_NR 2 + +#define FSL_EDMA_BUSWIDTHS BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES) + +struct fsl_edma_hw_tcd { + __le32 saddr; + __le16 soff; + __le16 attr; + __le32 nbytes; + __le32 slast; + __le32 daddr; + __le16 doff; + __le16 citer; + __le32 dlast_sga; + __le16 csr; + __le16 biter; +}; + +struct fsl_edma_sw_tcd { + dma_addr_t ptcd; + struct fsl_edma_hw_tcd *vtcd; +}; + +struct fsl_edma_slave_config { + enum dma_transfer_direction dir; + enum dma_slave_buswidth addr_width; + u32 dev_addr; + u32 burst; + u32 attr; +}; + +struct fsl_edma_chan { + struct virt_dma_chan vchan; + enum dma_status status; + struct fsl_edma_engine *edma; + struct fsl_edma_desc *edesc; + struct fsl_edma_slave_config fsc; + struct dma_pool *tcd_pool; +}; + +struct fsl_edma_desc { + struct virt_dma_desc vdesc; + struct fsl_edma_chan *echan; + bool iscyclic; + unsigned int n_tcds; + struct fsl_edma_sw_tcd tcd[]; +}; + +struct fsl_edma_engine { + struct dma_device dma_dev; + void __iomem *membase; + void __iomem *muxbase[DMAMUX_NR]; + struct clk *muxclk[DMAMUX_NR]; + struct mutex fsl_edma_mutex; + u32 n_chans; + int txirq; + int errirq; + bool big_endian; + struct fsl_edma_chan chans[]; +}; + +/* + * R/W functions for big- or little-endian registers: + * The eDMA controller's endian is independent of the CPU core's endian. + * For the big-endian IP module, the offset for 8-bit or 16-bit registers + * should also be swapped opposite to that in little-endian IP. + */ + +static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr) +{ + if (edma->big_endian) + return ioread32be(addr); + else + return ioread32(addr); +} + +static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr) +{ + /* swap the reg offset for these in big-endian mode */ + if (edma->big_endian) + iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3)); + else + iowrite8(val, addr); +} + +static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr) +{ + /* swap the reg offset for these in big-endian mode */ + if (edma->big_endian) + iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2)); + else + iowrite16(val, addr); +} + +static void edma_writel(struct fsl_edma_engine *edma, u32 val, void __iomem *addr) +{ + if (edma->big_endian) + iowrite32be(val, addr); + else + iowrite32(val, addr); +} + +static struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct fsl_edma_chan, vchan.chan); +} + +static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd) +{ + return container_of(vd, struct fsl_edma_desc, vdesc); +} + +static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan) +{ + void __iomem *addr = fsl_chan->edma->membase; + u32 ch = fsl_chan->vchan.chan.chan_id; + + edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI); + edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ); +} + +static void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan) +{ + void __iomem *addr = fsl_chan->edma->membase; + u32 ch = fsl_chan->vchan.chan.chan_id; + + edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ); + edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI); +} + +static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan, + unsigned int slot, bool enable) +{ + u32 ch = fsl_chan->vchan.chan.chan_id; + void __iomem *muxaddr; + unsigned chans_per_mux, ch_off; + + chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR; + ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux; + muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux]; + slot = EDMAMUX_CHCFG_SOURCE(slot); + + if (enable) + iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off); + else + iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off); +} + +static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width) +{ + switch (addr_width) { + case 1: + return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT; + case 2: + return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT; + case 4: + return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; + case 8: + return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT; + default: + return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT; + } +} + +static void fsl_edma_free_desc(struct virt_dma_desc *vdesc) +{ + struct fsl_edma_desc *fsl_desc; + int i; + + fsl_desc = to_fsl_edma_desc(vdesc); + for (i = 0; i < fsl_desc->n_tcds; i++) + dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd, + fsl_desc->tcd[i].ptcd); + kfree(fsl_desc); +} + +static int fsl_edma_terminate_all(struct dma_chan *chan) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + fsl_edma_disable_request(fsl_chan); + fsl_chan->edesc = NULL; + vchan_get_all_descriptors(&fsl_chan->vchan, &head); + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + vchan_dma_desc_free_list(&fsl_chan->vchan, &head); + return 0; +} + +static int fsl_edma_pause(struct dma_chan *chan) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + if (fsl_chan->edesc) { + fsl_edma_disable_request(fsl_chan); + fsl_chan->status = DMA_PAUSED; + } + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + return 0; +} + +static int fsl_edma_resume(struct dma_chan *chan) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + if (fsl_chan->edesc) { + fsl_edma_enable_request(fsl_chan); + fsl_chan->status = DMA_IN_PROGRESS; + } + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + return 0; +} + +static int fsl_edma_slave_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + + fsl_chan->fsc.dir = cfg->direction; + if (cfg->direction == DMA_DEV_TO_MEM) { + fsl_chan->fsc.dev_addr = cfg->src_addr; + fsl_chan->fsc.addr_width = cfg->src_addr_width; + fsl_chan->fsc.burst = cfg->src_maxburst; + fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width); + } else if (cfg->direction == DMA_MEM_TO_DEV) { + fsl_chan->fsc.dev_addr = cfg->dst_addr; + fsl_chan->fsc.addr_width = cfg->dst_addr_width; + fsl_chan->fsc.burst = cfg->dst_maxburst; + fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width); + } else { + return -EINVAL; + } + return 0; +} + +static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan, + struct virt_dma_desc *vdesc, bool in_progress) +{ + struct fsl_edma_desc *edesc = fsl_chan->edesc; + void __iomem *addr = fsl_chan->edma->membase; + u32 ch = fsl_chan->vchan.chan.chan_id; + enum dma_transfer_direction dir = fsl_chan->fsc.dir; + dma_addr_t cur_addr, dma_addr; + size_t len, size; + int i; + + /* calculate the total size in this desc */ + for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++) + len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes) + * le16_to_cpu(edesc->tcd[i].vtcd->biter); + + if (!in_progress) + return len; + + if (dir == DMA_MEM_TO_DEV) + cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_SADDR(ch)); + else + cur_addr = edma_readl(fsl_chan->edma, addr + EDMA_TCD_DADDR(ch)); + + /* figure out the finished and calculate the residue */ + for (i = 0; i < fsl_chan->edesc->n_tcds; i++) { + size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes) + * le16_to_cpu(edesc->tcd[i].vtcd->biter); + if (dir == DMA_MEM_TO_DEV) + dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr); + else + dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr); + + len -= size; + if (cur_addr >= dma_addr && cur_addr < dma_addr + size) { + len += dma_addr + size - cur_addr; + break; + } + } + + return len; +} + +static enum dma_status fsl_edma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + struct virt_dma_desc *vdesc; + enum dma_status status; + unsigned long flags; + + status = dma_cookie_status(chan, cookie, txstate); + if (status == DMA_COMPLETE) + return status; + + if (!txstate) + return fsl_chan->status; + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + vdesc = vchan_find_desc(&fsl_chan->vchan, cookie); + if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie) + txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, true); + else if (vdesc) + txstate->residue = fsl_edma_desc_residue(fsl_chan, vdesc, false); + else + txstate->residue = 0; + + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + + return fsl_chan->status; +} + +static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan, + struct fsl_edma_hw_tcd *tcd) +{ + struct fsl_edma_engine *edma = fsl_chan->edma; + void __iomem *addr = fsl_chan->edma->membase; + u32 ch = fsl_chan->vchan.chan.chan_id; + + /* + * TCD parameters are stored in struct fsl_edma_hw_tcd in little + * endian format. However, we need to load the TCD registers in + * big- or little-endian obeying the eDMA engine model endian. + */ + edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch)); + edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch)); + edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch)); + + edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch)); + edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch)); + + edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch)); + edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch)); + + edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch)); + edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch)); + edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch)); + + edma_writel(edma, le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch)); + + edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch)); +} + +static inline +void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst, + u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer, + u16 biter, u16 doff, u32 dlast_sga, bool major_int, + bool disable_req, bool enable_sg) +{ + u16 csr = 0; + + /* + * eDMA hardware SGs require the TCDs to be stored in little + * endian format irrespective of the register endian model. + * So we put the value in little endian in memory, waiting + * for fsl_edma_set_tcd_regs doing the swap. + */ + tcd->saddr = cpu_to_le32(src); + tcd->daddr = cpu_to_le32(dst); + + tcd->attr = cpu_to_le16(attr); + + tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff)); + + tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes)); + tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast)); + + tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer)); + tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff)); + + tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga)); + + tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter)); + if (major_int) + csr |= EDMA_TCD_CSR_INT_MAJOR; + + if (disable_req) + csr |= EDMA_TCD_CSR_D_REQ; + + if (enable_sg) + csr |= EDMA_TCD_CSR_E_SG; + + tcd->csr = cpu_to_le16(csr); +} + +static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan, + int sg_len) +{ + struct fsl_edma_desc *fsl_desc; + int i; + + fsl_desc = kzalloc(sizeof(*fsl_desc) + sizeof(struct fsl_edma_sw_tcd) * sg_len, + GFP_NOWAIT); + if (!fsl_desc) + return NULL; + + fsl_desc->echan = fsl_chan; + fsl_desc->n_tcds = sg_len; + for (i = 0; i < sg_len; i++) { + fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool, + GFP_NOWAIT, &fsl_desc->tcd[i].ptcd); + if (!fsl_desc->tcd[i].vtcd) + goto err; + } + return fsl_desc; + +err: + while (--i >= 0) + dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd, + fsl_desc->tcd[i].ptcd); + kfree(fsl_desc); + return NULL; +} + +static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + struct fsl_edma_desc *fsl_desc; + dma_addr_t dma_buf_next; + int sg_len, i; + u32 src_addr, dst_addr, last_sg, nbytes; + u16 soff, doff, iter; + + if (!is_slave_direction(fsl_chan->fsc.dir)) + return NULL; + + sg_len = buf_len / period_len; + fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); + if (!fsl_desc) + return NULL; + fsl_desc->iscyclic = true; + + dma_buf_next = dma_addr; + nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; + iter = period_len / nbytes; + + for (i = 0; i < sg_len; i++) { + if (dma_buf_next >= dma_addr + buf_len) + dma_buf_next = dma_addr; + + /* get next sg's physical address */ + last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; + + if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { + src_addr = dma_buf_next; + dst_addr = fsl_chan->fsc.dev_addr; + soff = fsl_chan->fsc.addr_width; + doff = 0; + } else { + src_addr = fsl_chan->fsc.dev_addr; + dst_addr = dma_buf_next; + soff = 0; + doff = fsl_chan->fsc.addr_width; + } + + fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr, + fsl_chan->fsc.attr, soff, nbytes, 0, iter, + iter, doff, last_sg, true, false, true); + dma_buf_next += period_len; + } + + return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); +} + +static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + struct fsl_edma_desc *fsl_desc; + struct scatterlist *sg; + u32 src_addr, dst_addr, last_sg, nbytes; + u16 soff, doff, iter; + int i; + + if (!is_slave_direction(fsl_chan->fsc.dir)) + return NULL; + + fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); + if (!fsl_desc) + return NULL; + fsl_desc->iscyclic = false; + + nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst; + for_each_sg(sgl, sg, sg_len, i) { + /* get next sg's physical address */ + last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd; + + if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) { + src_addr = sg_dma_address(sg); + dst_addr = fsl_chan->fsc.dev_addr; + soff = fsl_chan->fsc.addr_width; + doff = 0; + } else { + src_addr = fsl_chan->fsc.dev_addr; + dst_addr = sg_dma_address(sg); + soff = 0; + doff = fsl_chan->fsc.addr_width; + } + + iter = sg_dma_len(sg) / nbytes; + if (i < sg_len - 1) { + last_sg = fsl_desc->tcd[(i + 1)].ptcd; + fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, + dst_addr, fsl_chan->fsc.attr, soff, + nbytes, 0, iter, iter, doff, last_sg, + false, false, true); + } else { + last_sg = 0; + fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, + dst_addr, fsl_chan->fsc.attr, soff, + nbytes, 0, iter, iter, doff, last_sg, + true, true, false); + } + } + + return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags); +} + +static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan) +{ + struct virt_dma_desc *vdesc; + + vdesc = vchan_next_desc(&fsl_chan->vchan); + if (!vdesc) + return; + fsl_chan->edesc = to_fsl_edma_desc(vdesc); + fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd); + fsl_edma_enable_request(fsl_chan); + fsl_chan->status = DMA_IN_PROGRESS; +} + +static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id) +{ + struct fsl_edma_engine *fsl_edma = dev_id; + unsigned int intr, ch; + void __iomem *base_addr; + struct fsl_edma_chan *fsl_chan; + + base_addr = fsl_edma->membase; + + intr = edma_readl(fsl_edma, base_addr + EDMA_INTR); + if (!intr) + return IRQ_NONE; + + for (ch = 0; ch < fsl_edma->n_chans; ch++) { + if (intr & (0x1 << ch)) { + edma_writeb(fsl_edma, EDMA_CINT_CINT(ch), + base_addr + EDMA_CINT); + + fsl_chan = &fsl_edma->chans[ch]; + + spin_lock(&fsl_chan->vchan.lock); + if (!fsl_chan->edesc->iscyclic) { + list_del(&fsl_chan->edesc->vdesc.node); + vchan_cookie_complete(&fsl_chan->edesc->vdesc); + fsl_chan->edesc = NULL; + fsl_chan->status = DMA_COMPLETE; + } else { + vchan_cyclic_callback(&fsl_chan->edesc->vdesc); + } + + if (!fsl_chan->edesc) + fsl_edma_xfer_desc(fsl_chan); + + spin_unlock(&fsl_chan->vchan.lock); + } + } + return IRQ_HANDLED; +} + +static irqreturn_t fsl_edma_err_handler(int irq, void *dev_id) +{ + struct fsl_edma_engine *fsl_edma = dev_id; + unsigned int err, ch; + + err = edma_readl(fsl_edma, fsl_edma->membase + EDMA_ERR); + if (!err) + return IRQ_NONE; + + for (ch = 0; ch < fsl_edma->n_chans; ch++) { + if (err & (0x1 << ch)) { + fsl_edma_disable_request(&fsl_edma->chans[ch]); + edma_writeb(fsl_edma, EDMA_CERR_CERR(ch), + fsl_edma->membase + EDMA_CERR); + fsl_edma->chans[ch].status = DMA_ERROR; + } + } + return IRQ_HANDLED; +} + +static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id) +{ + if (fsl_edma_tx_handler(irq, dev_id) == IRQ_HANDLED) + return IRQ_HANDLED; + + return fsl_edma_err_handler(irq, dev_id); +} + +static void fsl_edma_issue_pending(struct dma_chan *chan) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + + if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc) + fsl_edma_xfer_desc(fsl_chan); + + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); +} + +static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct fsl_edma_engine *fsl_edma = ofdma->of_dma_data; + struct dma_chan *chan, *_chan; + unsigned long chans_per_mux = fsl_edma->n_chans / DMAMUX_NR; + + if (dma_spec->args_count != 2) + return NULL; + + mutex_lock(&fsl_edma->fsl_edma_mutex); + list_for_each_entry_safe(chan, _chan, &fsl_edma->dma_dev.channels, device_node) { + if (chan->client_count) + continue; + if ((chan->chan_id / chans_per_mux) == dma_spec->args[0]) { + chan = dma_get_slave_channel(chan); + if (chan) { + chan->device->privatecnt++; + fsl_edma_chan_mux(to_fsl_edma_chan(chan), + dma_spec->args[1], true); + mutex_unlock(&fsl_edma->fsl_edma_mutex); + return chan; + } + } + } + mutex_unlock(&fsl_edma->fsl_edma_mutex); + return NULL; +} + +static int fsl_edma_alloc_chan_resources(struct dma_chan *chan) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + + fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev, + sizeof(struct fsl_edma_hw_tcd), + 32, 0); + return 0; +} + +static void fsl_edma_free_chan_resources(struct dma_chan *chan) +{ + struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&fsl_chan->vchan.lock, flags); + fsl_edma_disable_request(fsl_chan); + fsl_edma_chan_mux(fsl_chan, 0, false); + fsl_chan->edesc = NULL; + vchan_get_all_descriptors(&fsl_chan->vchan, &head); + spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); + + vchan_dma_desc_free_list(&fsl_chan->vchan, &head); + dma_pool_destroy(fsl_chan->tcd_pool); + fsl_chan->tcd_pool = NULL; +} + +static int +fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma) +{ + int ret; + + fsl_edma->txirq = platform_get_irq_byname(pdev, "edma-tx"); + if (fsl_edma->txirq < 0) { + dev_err(&pdev->dev, "Can't get edma-tx irq.\n"); + return fsl_edma->txirq; + } + + fsl_edma->errirq = platform_get_irq_byname(pdev, "edma-err"); + if (fsl_edma->errirq < 0) { + dev_err(&pdev->dev, "Can't get edma-err irq.\n"); + return fsl_edma->errirq; + } + + if (fsl_edma->txirq == fsl_edma->errirq) { + ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, + fsl_edma_irq_handler, 0, "eDMA", fsl_edma); + if (ret) { + dev_err(&pdev->dev, "Can't register eDMA IRQ.\n"); + return ret; + } + } else { + ret = devm_request_irq(&pdev->dev, fsl_edma->txirq, + fsl_edma_tx_handler, 0, "eDMA tx", fsl_edma); + if (ret) { + dev_err(&pdev->dev, "Can't register eDMA tx IRQ.\n"); + return ret; + } + + ret = devm_request_irq(&pdev->dev, fsl_edma->errirq, + fsl_edma_err_handler, 0, "eDMA err", fsl_edma); + if (ret) { + dev_err(&pdev->dev, "Can't register eDMA err IRQ.\n"); + return ret; + } + } + + return 0; +} + +static int fsl_edma_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct fsl_edma_engine *fsl_edma; + struct fsl_edma_chan *fsl_chan; + struct resource *res; + int len, chans; + int ret, i; + + ret = of_property_read_u32(np, "dma-channels", &chans); + if (ret) { + dev_err(&pdev->dev, "Can't get dma-channels.\n"); + return ret; + } + + len = sizeof(*fsl_edma) + sizeof(*fsl_chan) * chans; + fsl_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL); + if (!fsl_edma) + return -ENOMEM; + + fsl_edma->n_chans = chans; + mutex_init(&fsl_edma->fsl_edma_mutex); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + fsl_edma->membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(fsl_edma->membase)) + return PTR_ERR(fsl_edma->membase); + + for (i = 0; i < DMAMUX_NR; i++) { + char clkname[32]; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1 + i); + fsl_edma->muxbase[i] = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(fsl_edma->muxbase[i])) + return PTR_ERR(fsl_edma->muxbase[i]); + + sprintf(clkname, "dmamux%d", i); + fsl_edma->muxclk[i] = devm_clk_get(&pdev->dev, clkname); + if (IS_ERR(fsl_edma->muxclk[i])) { + dev_err(&pdev->dev, "Missing DMAMUX block clock.\n"); + return PTR_ERR(fsl_edma->muxclk[i]); + } + + ret = clk_prepare_enable(fsl_edma->muxclk[i]); + if (ret) { + dev_err(&pdev->dev, "DMAMUX clk block failed.\n"); + return ret; + } + + } + + ret = fsl_edma_irq_init(pdev, fsl_edma); + if (ret) + return ret; + + fsl_edma->big_endian = of_property_read_bool(np, "big-endian"); + + INIT_LIST_HEAD(&fsl_edma->dma_dev.channels); + for (i = 0; i < fsl_edma->n_chans; i++) { + struct fsl_edma_chan *fsl_chan = &fsl_edma->chans[i]; + + fsl_chan->edma = fsl_edma; + + fsl_chan->vchan.desc_free = fsl_edma_free_desc; + vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev); + + edma_writew(fsl_edma, 0x0, fsl_edma->membase + EDMA_TCD_CSR(i)); + fsl_edma_chan_mux(fsl_chan, 0, false); + } + + dma_cap_set(DMA_PRIVATE, fsl_edma->dma_dev.cap_mask); + dma_cap_set(DMA_SLAVE, fsl_edma->dma_dev.cap_mask); + dma_cap_set(DMA_CYCLIC, fsl_edma->dma_dev.cap_mask); + + fsl_edma->dma_dev.dev = &pdev->dev; + fsl_edma->dma_dev.device_alloc_chan_resources + = fsl_edma_alloc_chan_resources; + fsl_edma->dma_dev.device_free_chan_resources + = fsl_edma_free_chan_resources; + fsl_edma->dma_dev.device_tx_status = fsl_edma_tx_status; + fsl_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg; + fsl_edma->dma_dev.device_prep_dma_cyclic = fsl_edma_prep_dma_cyclic; + fsl_edma->dma_dev.device_config = fsl_edma_slave_config; + fsl_edma->dma_dev.device_pause = fsl_edma_pause; + fsl_edma->dma_dev.device_resume = fsl_edma_resume; + fsl_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all; + fsl_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending; + + fsl_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS; + fsl_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS; + fsl_edma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + + platform_set_drvdata(pdev, fsl_edma); + + ret = dma_async_device_register(&fsl_edma->dma_dev); + if (ret) { + dev_err(&pdev->dev, "Can't register Freescale eDMA engine.\n"); + return ret; + } + + ret = of_dma_controller_register(np, fsl_edma_xlate, fsl_edma); + if (ret) { + dev_err(&pdev->dev, "Can't register Freescale eDMA of_dma.\n"); + dma_async_device_unregister(&fsl_edma->dma_dev); + return ret; + } + + /* enable round robin arbitration */ + edma_writel(fsl_edma, EDMA_CR_ERGA | EDMA_CR_ERCA, fsl_edma->membase + EDMA_CR); + + return 0; +} + +static int fsl_edma_remove(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct fsl_edma_engine *fsl_edma = platform_get_drvdata(pdev); + int i; + + of_dma_controller_free(np); + dma_async_device_unregister(&fsl_edma->dma_dev); + + for (i = 0; i < DMAMUX_NR; i++) + clk_disable_unprepare(fsl_edma->muxclk[i]); + + return 0; +} + +static const struct of_device_id fsl_edma_dt_ids[] = { + { .compatible = "fsl,vf610-edma", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, fsl_edma_dt_ids); + +static struct platform_driver fsl_edma_driver = { + .driver = { + .name = "fsl-edma", + .of_match_table = fsl_edma_dt_ids, + }, + .probe = fsl_edma_probe, + .remove = fsl_edma_remove, +}; + +static int __init fsl_edma_init(void) +{ + return platform_driver_register(&fsl_edma_driver); +} +subsys_initcall(fsl_edma_init); + +static void __exit fsl_edma_exit(void) +{ + platform_driver_unregister(&fsl_edma_driver); +} +module_exit(fsl_edma_exit); + +MODULE_ALIAS("platform:fsl-edma"); +MODULE_DESCRIPTION("Freescale eDMA engine driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/fsl_raid.c b/drivers/dma/fsl_raid.c new file mode 100644 index 000000000..4d9470f16 --- /dev/null +++ b/drivers/dma/fsl_raid.c @@ -0,0 +1,904 @@ +/* + * drivers/dma/fsl_raid.c + * + * Freescale RAID Engine device driver + * + * Author: + * Harninder Rai <harninder.rai@freescale.com> + * Naveen Burmi <naveenburmi@freescale.com> + * + * Rewrite: + * Xuelin Shi <xuelin.shi@freescale.com> + * + * Copyright (c) 2010-2014 Freescale Semiconductor, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Freescale Semiconductor nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * ALTERNATIVELY, this software may be distributed under the terms of the + * GNU General Public License ("GPL") as published by the Free Software + * Foundation, either version 2 of that License or (at your option) any + * later version. + * + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Theory of operation: + * + * General capabilities: + * RAID Engine (RE) block is capable of offloading XOR, memcpy and P/Q + * calculations required in RAID5 and RAID6 operations. RE driver + * registers with Linux's ASYNC layer as dma driver. RE hardware + * maintains strict ordering of the requests through chained + * command queueing. + * + * Data flow: + * Software RAID layer of Linux (MD layer) maintains RAID partitions, + * strips, stripes etc. It sends requests to the underlying ASYNC layer + * which further passes it to RE driver. ASYNC layer decides which request + * goes to which job ring of RE hardware. For every request processed by + * RAID Engine, driver gets an interrupt unless coalescing is set. The + * per job ring interrupt handler checks the status register for errors, + * clears the interrupt and leave the post interrupt processing to the irq + * thread. + */ +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/dmaengine.h> +#include <linux/io.h> +#include <linux/spinlock.h> +#include <linux/slab.h> + +#include "dmaengine.h" +#include "fsl_raid.h" + +#define FSL_RE_MAX_XOR_SRCS 16 +#define FSL_RE_MAX_PQ_SRCS 16 +#define FSL_RE_MIN_DESCS 256 +#define FSL_RE_MAX_DESCS (4 * FSL_RE_MIN_DESCS) +#define FSL_RE_FRAME_FORMAT 0x1 +#define FSL_RE_MAX_DATA_LEN (1024*1024) + +#define to_fsl_re_dma_desc(tx) container_of(tx, struct fsl_re_desc, async_tx) + +/* Add descriptors into per chan software queue - submit_q */ +static dma_cookie_t fsl_re_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct fsl_re_desc *desc; + struct fsl_re_chan *re_chan; + dma_cookie_t cookie; + unsigned long flags; + + desc = to_fsl_re_dma_desc(tx); + re_chan = container_of(tx->chan, struct fsl_re_chan, chan); + + spin_lock_irqsave(&re_chan->desc_lock, flags); + cookie = dma_cookie_assign(tx); + list_add_tail(&desc->node, &re_chan->submit_q); + spin_unlock_irqrestore(&re_chan->desc_lock, flags); + + return cookie; +} + +/* Copy descriptor from per chan software queue into hardware job ring */ +static void fsl_re_issue_pending(struct dma_chan *chan) +{ + struct fsl_re_chan *re_chan; + int avail; + struct fsl_re_desc *desc, *_desc; + unsigned long flags; + + re_chan = container_of(chan, struct fsl_re_chan, chan); + + spin_lock_irqsave(&re_chan->desc_lock, flags); + avail = FSL_RE_SLOT_AVAIL( + in_be32(&re_chan->jrregs->inbring_slot_avail)); + + list_for_each_entry_safe(desc, _desc, &re_chan->submit_q, node) { + if (!avail) + break; + + list_move_tail(&desc->node, &re_chan->active_q); + + memcpy(&re_chan->inb_ring_virt_addr[re_chan->inb_count], + &desc->hwdesc, sizeof(struct fsl_re_hw_desc)); + + re_chan->inb_count = (re_chan->inb_count + 1) & + FSL_RE_RING_SIZE_MASK; + out_be32(&re_chan->jrregs->inbring_add_job, FSL_RE_ADD_JOB(1)); + avail--; + } + spin_unlock_irqrestore(&re_chan->desc_lock, flags); +} + +static void fsl_re_desc_done(struct fsl_re_desc *desc) +{ + dma_async_tx_callback callback; + void *callback_param; + + dma_cookie_complete(&desc->async_tx); + + callback = desc->async_tx.callback; + callback_param = desc->async_tx.callback_param; + if (callback) + callback(callback_param); + + dma_descriptor_unmap(&desc->async_tx); +} + +static void fsl_re_cleanup_descs(struct fsl_re_chan *re_chan) +{ + struct fsl_re_desc *desc, *_desc; + unsigned long flags; + + spin_lock_irqsave(&re_chan->desc_lock, flags); + list_for_each_entry_safe(desc, _desc, &re_chan->ack_q, node) { + if (async_tx_test_ack(&desc->async_tx)) + list_move_tail(&desc->node, &re_chan->free_q); + } + spin_unlock_irqrestore(&re_chan->desc_lock, flags); + + fsl_re_issue_pending(&re_chan->chan); +} + +static void fsl_re_dequeue(unsigned long data) +{ + struct fsl_re_chan *re_chan; + struct fsl_re_desc *desc, *_desc; + struct fsl_re_hw_desc *hwdesc; + unsigned long flags; + unsigned int count, oub_count; + int found; + + re_chan = dev_get_drvdata((struct device *)data); + + fsl_re_cleanup_descs(re_chan); + + spin_lock_irqsave(&re_chan->desc_lock, flags); + count = FSL_RE_SLOT_FULL(in_be32(&re_chan->jrregs->oubring_slot_full)); + while (count--) { + found = 0; + hwdesc = &re_chan->oub_ring_virt_addr[re_chan->oub_count]; + list_for_each_entry_safe(desc, _desc, &re_chan->active_q, + node) { + /* compare the hw dma addr to find the completed */ + if (desc->hwdesc.lbea32 == hwdesc->lbea32 && + desc->hwdesc.addr_low == hwdesc->addr_low) { + found = 1; + break; + } + } + + if (found) { + fsl_re_desc_done(desc); + list_move_tail(&desc->node, &re_chan->ack_q); + } else { + dev_err(re_chan->dev, + "found hwdesc not in sw queue, discard it\n"); + } + + oub_count = (re_chan->oub_count + 1) & FSL_RE_RING_SIZE_MASK; + re_chan->oub_count = oub_count; + + out_be32(&re_chan->jrregs->oubring_job_rmvd, + FSL_RE_RMVD_JOB(1)); + } + spin_unlock_irqrestore(&re_chan->desc_lock, flags); +} + +/* Per Job Ring interrupt handler */ +static irqreturn_t fsl_re_isr(int irq, void *data) +{ + struct fsl_re_chan *re_chan; + u32 irqstate, status; + + re_chan = dev_get_drvdata((struct device *)data); + + irqstate = in_be32(&re_chan->jrregs->jr_interrupt_status); + if (!irqstate) + return IRQ_NONE; + + /* + * There's no way in upper layer (read MD layer) to recover from + * error conditions except restart everything. In long term we + * need to do something more than just crashing + */ + if (irqstate & FSL_RE_ERROR) { + status = in_be32(&re_chan->jrregs->jr_status); + dev_err(re_chan->dev, "chan error irqstate: %x, status: %x\n", + irqstate, status); + } + + /* Clear interrupt */ + out_be32(&re_chan->jrregs->jr_interrupt_status, FSL_RE_CLR_INTR); + + tasklet_schedule(&re_chan->irqtask); + + return IRQ_HANDLED; +} + +static enum dma_status fsl_re_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + return dma_cookie_status(chan, cookie, txstate); +} + +static void fill_cfd_frame(struct fsl_re_cmpnd_frame *cf, u8 index, + size_t length, dma_addr_t addr, bool final) +{ + u32 efrl = length & FSL_RE_CF_LENGTH_MASK; + + efrl |= final << FSL_RE_CF_FINAL_SHIFT; + cf[index].efrl32 = efrl; + cf[index].addr_high = upper_32_bits(addr); + cf[index].addr_low = lower_32_bits(addr); +} + +static struct fsl_re_desc *fsl_re_init_desc(struct fsl_re_chan *re_chan, + struct fsl_re_desc *desc, + void *cf, dma_addr_t paddr) +{ + desc->re_chan = re_chan; + desc->async_tx.tx_submit = fsl_re_tx_submit; + dma_async_tx_descriptor_init(&desc->async_tx, &re_chan->chan); + INIT_LIST_HEAD(&desc->node); + + desc->hwdesc.fmt32 = FSL_RE_FRAME_FORMAT << FSL_RE_HWDESC_FMT_SHIFT; + desc->hwdesc.lbea32 = upper_32_bits(paddr); + desc->hwdesc.addr_low = lower_32_bits(paddr); + desc->cf_addr = cf; + desc->cf_paddr = paddr; + + desc->cdb_addr = (void *)(cf + FSL_RE_CF_DESC_SIZE); + desc->cdb_paddr = paddr + FSL_RE_CF_DESC_SIZE; + + return desc; +} + +static struct fsl_re_desc *fsl_re_chan_alloc_desc(struct fsl_re_chan *re_chan, + unsigned long flags) +{ + struct fsl_re_desc *desc = NULL; + void *cf; + dma_addr_t paddr; + unsigned long lock_flag; + + fsl_re_cleanup_descs(re_chan); + + spin_lock_irqsave(&re_chan->desc_lock, lock_flag); + if (!list_empty(&re_chan->free_q)) { + /* take one desc from free_q */ + desc = list_first_entry(&re_chan->free_q, + struct fsl_re_desc, node); + list_del(&desc->node); + + desc->async_tx.flags = flags; + } + spin_unlock_irqrestore(&re_chan->desc_lock, lock_flag); + + if (!desc) { + desc = kzalloc(sizeof(*desc), GFP_NOWAIT); + if (!desc) + return NULL; + + cf = dma_pool_alloc(re_chan->re_dev->cf_desc_pool, GFP_NOWAIT, + &paddr); + if (!cf) { + kfree(desc); + return NULL; + } + + desc = fsl_re_init_desc(re_chan, desc, cf, paddr); + desc->async_tx.flags = flags; + + spin_lock_irqsave(&re_chan->desc_lock, lock_flag); + re_chan->alloc_count++; + spin_unlock_irqrestore(&re_chan->desc_lock, lock_flag); + } + + return desc; +} + +static struct dma_async_tx_descriptor *fsl_re_prep_dma_genq( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + unsigned long flags) +{ + struct fsl_re_chan *re_chan; + struct fsl_re_desc *desc; + struct fsl_re_xor_cdb *xor; + struct fsl_re_cmpnd_frame *cf; + u32 cdb; + unsigned int i, j; + unsigned int save_src_cnt = src_cnt; + int cont_q = 0; + + re_chan = container_of(chan, struct fsl_re_chan, chan); + if (len > FSL_RE_MAX_DATA_LEN) { + dev_err(re_chan->dev, "genq tx length %lu, max length %d\n", + len, FSL_RE_MAX_DATA_LEN); + return NULL; + } + + desc = fsl_re_chan_alloc_desc(re_chan, flags); + if (desc <= 0) + return NULL; + + if (scf && (flags & DMA_PREP_CONTINUE)) { + cont_q = 1; + src_cnt += 1; + } + + /* Filling xor CDB */ + cdb = FSL_RE_XOR_OPCODE << FSL_RE_CDB_OPCODE_SHIFT; + cdb |= (src_cnt - 1) << FSL_RE_CDB_NRCS_SHIFT; + cdb |= FSL_RE_BLOCK_SIZE << FSL_RE_CDB_BLKSIZE_SHIFT; + cdb |= FSL_RE_INTR_ON_ERROR << FSL_RE_CDB_ERROR_SHIFT; + cdb |= FSL_RE_DATA_DEP << FSL_RE_CDB_DEPEND_SHIFT; + xor = desc->cdb_addr; + xor->cdb32 = cdb; + + if (scf) { + /* compute q = src0*coef0^src1*coef1^..., * is GF(8) mult */ + for (i = 0; i < save_src_cnt; i++) + xor->gfm[i] = scf[i]; + if (cont_q) + xor->gfm[i++] = 1; + } else { + /* compute P, that is XOR all srcs */ + for (i = 0; i < src_cnt; i++) + xor->gfm[i] = 1; + } + + /* Filling frame 0 of compound frame descriptor with CDB */ + cf = desc->cf_addr; + fill_cfd_frame(cf, 0, sizeof(*xor), desc->cdb_paddr, 0); + + /* Fill CFD's 1st frame with dest buffer */ + fill_cfd_frame(cf, 1, len, dest, 0); + + /* Fill CFD's rest of the frames with source buffers */ + for (i = 2, j = 0; j < save_src_cnt; i++, j++) + fill_cfd_frame(cf, i, len, src[j], 0); + + if (cont_q) + fill_cfd_frame(cf, i++, len, dest, 0); + + /* Setting the final bit in the last source buffer frame in CFD */ + cf[i - 1].efrl32 |= 1 << FSL_RE_CF_FINAL_SHIFT; + + return &desc->async_tx; +} + +/* + * Prep function for P parity calculation.In RAID Engine terminology, + * XOR calculation is called GenQ calculation done through GenQ command + */ +static struct dma_async_tx_descriptor *fsl_re_prep_dma_xor( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, + unsigned int src_cnt, size_t len, unsigned long flags) +{ + /* NULL let genq take all coef as 1 */ + return fsl_re_prep_dma_genq(chan, dest, src, src_cnt, NULL, len, flags); +} + +/* + * Prep function for P/Q parity calculation.In RAID Engine terminology, + * P/Q calculation is called GenQQ done through GenQQ command + */ +static struct dma_async_tx_descriptor *fsl_re_prep_dma_pq( + struct dma_chan *chan, dma_addr_t *dest, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + unsigned long flags) +{ + struct fsl_re_chan *re_chan; + struct fsl_re_desc *desc; + struct fsl_re_pq_cdb *pq; + struct fsl_re_cmpnd_frame *cf; + u32 cdb; + u8 *p; + int gfmq_len, i, j; + unsigned int save_src_cnt = src_cnt; + + re_chan = container_of(chan, struct fsl_re_chan, chan); + if (len > FSL_RE_MAX_DATA_LEN) { + dev_err(re_chan->dev, "pq tx length is %lu, max length is %d\n", + len, FSL_RE_MAX_DATA_LEN); + return NULL; + } + + /* + * RE requires at least 2 sources, if given only one source, we pass the + * second source same as the first one. + * With only one source, generating P is meaningless, only generate Q. + */ + if (src_cnt == 1) { + struct dma_async_tx_descriptor *tx; + dma_addr_t dma_src[2]; + unsigned char coef[2]; + + dma_src[0] = *src; + coef[0] = *scf; + dma_src[1] = *src; + coef[1] = 0; + tx = fsl_re_prep_dma_genq(chan, dest[1], dma_src, 2, coef, len, + flags); + if (tx) + desc = to_fsl_re_dma_desc(tx); + + return tx; + } + + /* + * During RAID6 array creation, Linux's MD layer gets P and Q + * calculated separately in two steps. But our RAID Engine has + * the capability to calculate both P and Q with a single command + * Hence to merge well with MD layer, we need to provide a hook + * here and call re_jq_prep_dma_genq() function + */ + + if (flags & DMA_PREP_PQ_DISABLE_P) + return fsl_re_prep_dma_genq(chan, dest[1], src, src_cnt, + scf, len, flags); + + if (flags & DMA_PREP_CONTINUE) + src_cnt += 3; + + desc = fsl_re_chan_alloc_desc(re_chan, flags); + if (desc <= 0) + return NULL; + + /* Filling GenQQ CDB */ + cdb = FSL_RE_PQ_OPCODE << FSL_RE_CDB_OPCODE_SHIFT; + cdb |= (src_cnt - 1) << FSL_RE_CDB_NRCS_SHIFT; + cdb |= FSL_RE_BLOCK_SIZE << FSL_RE_CDB_BLKSIZE_SHIFT; + cdb |= FSL_RE_BUFFER_OUTPUT << FSL_RE_CDB_BUFFER_SHIFT; + cdb |= FSL_RE_DATA_DEP << FSL_RE_CDB_DEPEND_SHIFT; + + pq = desc->cdb_addr; + pq->cdb32 = cdb; + + p = pq->gfm_q1; + /* Init gfm_q1[] */ + for (i = 0; i < src_cnt; i++) + p[i] = 1; + + /* Align gfm[] to 32bit */ + gfmq_len = ALIGN(src_cnt, 4); + + /* Init gfm_q2[] */ + p += gfmq_len; + for (i = 0; i < src_cnt; i++) + p[i] = scf[i]; + + /* Filling frame 0 of compound frame descriptor with CDB */ + cf = desc->cf_addr; + fill_cfd_frame(cf, 0, sizeof(struct fsl_re_pq_cdb), desc->cdb_paddr, 0); + + /* Fill CFD's 1st & 2nd frame with dest buffers */ + for (i = 1, j = 0; i < 3; i++, j++) + fill_cfd_frame(cf, i, len, dest[j], 0); + + /* Fill CFD's rest of the frames with source buffers */ + for (i = 3, j = 0; j < save_src_cnt; i++, j++) + fill_cfd_frame(cf, i, len, src[j], 0); + + /* PQ computation continuation */ + if (flags & DMA_PREP_CONTINUE) { + if (src_cnt - save_src_cnt == 3) { + p[save_src_cnt] = 0; + p[save_src_cnt + 1] = 0; + p[save_src_cnt + 2] = 1; + fill_cfd_frame(cf, i++, len, dest[0], 0); + fill_cfd_frame(cf, i++, len, dest[1], 0); + fill_cfd_frame(cf, i++, len, dest[1], 0); + } else { + dev_err(re_chan->dev, "PQ tx continuation error!\n"); + return NULL; + } + } + + /* Setting the final bit in the last source buffer frame in CFD */ + cf[i - 1].efrl32 |= 1 << FSL_RE_CF_FINAL_SHIFT; + + return &desc->async_tx; +} + +/* + * Prep function for memcpy. In RAID Engine, memcpy is done through MOVE + * command. Logic of this function will need to be modified once multipage + * support is added in Linux's MD/ASYNC Layer + */ +static struct dma_async_tx_descriptor *fsl_re_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct fsl_re_chan *re_chan; + struct fsl_re_desc *desc; + size_t length; + struct fsl_re_cmpnd_frame *cf; + struct fsl_re_move_cdb *move; + u32 cdb; + + re_chan = container_of(chan, struct fsl_re_chan, chan); + + if (len > FSL_RE_MAX_DATA_LEN) { + dev_err(re_chan->dev, "cp tx length is %lu, max length is %d\n", + len, FSL_RE_MAX_DATA_LEN); + return NULL; + } + + desc = fsl_re_chan_alloc_desc(re_chan, flags); + if (desc <= 0) + return NULL; + + /* Filling move CDB */ + cdb = FSL_RE_MOVE_OPCODE << FSL_RE_CDB_OPCODE_SHIFT; + cdb |= FSL_RE_BLOCK_SIZE << FSL_RE_CDB_BLKSIZE_SHIFT; + cdb |= FSL_RE_INTR_ON_ERROR << FSL_RE_CDB_ERROR_SHIFT; + cdb |= FSL_RE_DATA_DEP << FSL_RE_CDB_DEPEND_SHIFT; + + move = desc->cdb_addr; + move->cdb32 = cdb; + + /* Filling frame 0 of CFD with move CDB */ + cf = desc->cf_addr; + fill_cfd_frame(cf, 0, sizeof(*move), desc->cdb_paddr, 0); + + length = min_t(size_t, len, FSL_RE_MAX_DATA_LEN); + + /* Fill CFD's 1st frame with dest buffer */ + fill_cfd_frame(cf, 1, length, dest, 0); + + /* Fill CFD's 2nd frame with src buffer */ + fill_cfd_frame(cf, 2, length, src, 1); + + return &desc->async_tx; +} + +static int fsl_re_alloc_chan_resources(struct dma_chan *chan) +{ + struct fsl_re_chan *re_chan; + struct fsl_re_desc *desc; + void *cf; + dma_addr_t paddr; + int i; + + re_chan = container_of(chan, struct fsl_re_chan, chan); + for (i = 0; i < FSL_RE_MIN_DESCS; i++) { + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) + break; + + cf = dma_pool_alloc(re_chan->re_dev->cf_desc_pool, GFP_KERNEL, + &paddr); + if (!cf) { + kfree(desc); + break; + } + + INIT_LIST_HEAD(&desc->node); + fsl_re_init_desc(re_chan, desc, cf, paddr); + + list_add_tail(&desc->node, &re_chan->free_q); + re_chan->alloc_count++; + } + return re_chan->alloc_count; +} + +static void fsl_re_free_chan_resources(struct dma_chan *chan) +{ + struct fsl_re_chan *re_chan; + struct fsl_re_desc *desc; + + re_chan = container_of(chan, struct fsl_re_chan, chan); + while (re_chan->alloc_count--) { + desc = list_first_entry(&re_chan->free_q, + struct fsl_re_desc, + node); + + list_del(&desc->node); + dma_pool_free(re_chan->re_dev->cf_desc_pool, desc->cf_addr, + desc->cf_paddr); + kfree(desc); + } + + if (!list_empty(&re_chan->free_q)) + dev_err(re_chan->dev, "chan resource cannot be cleaned!\n"); +} + +static int fsl_re_chan_probe(struct platform_device *ofdev, + struct device_node *np, u8 q, u32 off) +{ + struct device *dev, *chandev; + struct fsl_re_drv_private *re_priv; + struct fsl_re_chan *chan; + struct dma_device *dma_dev; + u32 ptr; + u32 status; + int ret = 0, rc; + struct platform_device *chan_ofdev; + + dev = &ofdev->dev; + re_priv = dev_get_drvdata(dev); + dma_dev = &re_priv->dma_dev; + + chan = devm_kzalloc(dev, sizeof(*chan), GFP_KERNEL); + if (!chan) + return -ENOMEM; + + /* create platform device for chan node */ + chan_ofdev = of_platform_device_create(np, NULL, dev); + if (!chan_ofdev) { + dev_err(dev, "Not able to create ofdev for jr %d\n", q); + ret = -EINVAL; + goto err_free; + } + + /* read reg property from dts */ + rc = of_property_read_u32(np, "reg", &ptr); + if (rc) { + dev_err(dev, "Reg property not found in jr %d\n", q); + ret = -ENODEV; + goto err_free; + } + + chan->jrregs = (struct fsl_re_chan_cfg *)((u8 *)re_priv->re_regs + + off + ptr); + + /* read irq property from dts */ + chan->irq = irq_of_parse_and_map(np, 0); + if (chan->irq == NO_IRQ) { + dev_err(dev, "No IRQ defined for JR %d\n", q); + ret = -ENODEV; + goto err_free; + } + + snprintf(chan->name, sizeof(chan->name), "re_jr%02d", q); + + chandev = &chan_ofdev->dev; + tasklet_init(&chan->irqtask, fsl_re_dequeue, (unsigned long)chandev); + + ret = request_irq(chan->irq, fsl_re_isr, 0, chan->name, chandev); + if (ret) { + dev_err(dev, "Unable to register interrupt for JR %d\n", q); + ret = -EINVAL; + goto err_free; + } + + re_priv->re_jrs[q] = chan; + chan->chan.device = dma_dev; + chan->chan.private = chan; + chan->dev = chandev; + chan->re_dev = re_priv; + + spin_lock_init(&chan->desc_lock); + INIT_LIST_HEAD(&chan->ack_q); + INIT_LIST_HEAD(&chan->active_q); + INIT_LIST_HEAD(&chan->submit_q); + INIT_LIST_HEAD(&chan->free_q); + + chan->inb_ring_virt_addr = dma_pool_alloc(chan->re_dev->hw_desc_pool, + GFP_KERNEL, &chan->inb_phys_addr); + if (!chan->inb_ring_virt_addr) { + dev_err(dev, "No dma memory for inb_ring_virt_addr\n"); + ret = -ENOMEM; + goto err_free; + } + + chan->oub_ring_virt_addr = dma_pool_alloc(chan->re_dev->hw_desc_pool, + GFP_KERNEL, &chan->oub_phys_addr); + if (!chan->oub_ring_virt_addr) { + dev_err(dev, "No dma memory for oub_ring_virt_addr\n"); + ret = -ENOMEM; + goto err_free_1; + } + + /* Program the Inbound/Outbound ring base addresses and size */ + out_be32(&chan->jrregs->inbring_base_h, + chan->inb_phys_addr & FSL_RE_ADDR_BIT_MASK); + out_be32(&chan->jrregs->oubring_base_h, + chan->oub_phys_addr & FSL_RE_ADDR_BIT_MASK); + out_be32(&chan->jrregs->inbring_base_l, + chan->inb_phys_addr >> FSL_RE_ADDR_BIT_SHIFT); + out_be32(&chan->jrregs->oubring_base_l, + chan->oub_phys_addr >> FSL_RE_ADDR_BIT_SHIFT); + out_be32(&chan->jrregs->inbring_size, + FSL_RE_RING_SIZE << FSL_RE_RING_SIZE_SHIFT); + out_be32(&chan->jrregs->oubring_size, + FSL_RE_RING_SIZE << FSL_RE_RING_SIZE_SHIFT); + + /* Read LIODN value from u-boot */ + status = in_be32(&chan->jrregs->jr_config_1) & FSL_RE_REG_LIODN_MASK; + + /* Program the CFG reg */ + out_be32(&chan->jrregs->jr_config_1, + FSL_RE_CFG1_CBSI | FSL_RE_CFG1_CBS0 | status); + + dev_set_drvdata(chandev, chan); + + /* Enable RE/CHAN */ + out_be32(&chan->jrregs->jr_command, FSL_RE_ENABLE); + + return 0; + +err_free_1: + dma_pool_free(chan->re_dev->hw_desc_pool, chan->inb_ring_virt_addr, + chan->inb_phys_addr); +err_free: + return ret; +} + +/* Probe function for RAID Engine */ +static int fsl_re_probe(struct platform_device *ofdev) +{ + struct fsl_re_drv_private *re_priv; + struct device_node *np; + struct device_node *child; + u32 off; + u8 ridx = 0; + struct dma_device *dma_dev; + struct resource *res; + int rc; + struct device *dev = &ofdev->dev; + + re_priv = devm_kzalloc(dev, sizeof(*re_priv), GFP_KERNEL); + if (!re_priv) + return -ENOMEM; + + res = platform_get_resource(ofdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + /* IOMAP the entire RAID Engine region */ + re_priv->re_regs = devm_ioremap(dev, res->start, resource_size(res)); + if (!re_priv->re_regs) + return -EBUSY; + + /* Program the RE mode */ + out_be32(&re_priv->re_regs->global_config, FSL_RE_NON_DPAA_MODE); + + /* Program Galois Field polynomial */ + out_be32(&re_priv->re_regs->galois_field_config, FSL_RE_GFM_POLY); + + dev_info(dev, "version %x, mode %x, gfp %x\n", + in_be32(&re_priv->re_regs->re_version_id), + in_be32(&re_priv->re_regs->global_config), + in_be32(&re_priv->re_regs->galois_field_config)); + + dma_dev = &re_priv->dma_dev; + dma_dev->dev = dev; + INIT_LIST_HEAD(&dma_dev->channels); + dma_set_mask(dev, DMA_BIT_MASK(40)); + + dma_dev->device_alloc_chan_resources = fsl_re_alloc_chan_resources; + dma_dev->device_tx_status = fsl_re_tx_status; + dma_dev->device_issue_pending = fsl_re_issue_pending; + + dma_dev->max_xor = FSL_RE_MAX_XOR_SRCS; + dma_dev->device_prep_dma_xor = fsl_re_prep_dma_xor; + dma_cap_set(DMA_XOR, dma_dev->cap_mask); + + dma_dev->max_pq = FSL_RE_MAX_PQ_SRCS; + dma_dev->device_prep_dma_pq = fsl_re_prep_dma_pq; + dma_cap_set(DMA_PQ, dma_dev->cap_mask); + + dma_dev->device_prep_dma_memcpy = fsl_re_prep_dma_memcpy; + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + + dma_dev->device_free_chan_resources = fsl_re_free_chan_resources; + + re_priv->total_chans = 0; + + re_priv->cf_desc_pool = dmam_pool_create("fsl_re_cf_desc_pool", dev, + FSL_RE_CF_CDB_SIZE, + FSL_RE_CF_CDB_ALIGN, 0); + + if (!re_priv->cf_desc_pool) { + dev_err(dev, "No memory for fsl re_cf desc pool\n"); + return -ENOMEM; + } + + re_priv->hw_desc_pool = dmam_pool_create("fsl_re_hw_desc_pool", dev, + sizeof(struct fsl_re_hw_desc) * FSL_RE_RING_SIZE, + FSL_RE_FRAME_ALIGN, 0); + if (!re_priv->hw_desc_pool) { + dev_err(dev, "No memory for fsl re_hw desc pool\n"); + return -ENOMEM; + } + + dev_set_drvdata(dev, re_priv); + + /* Parse Device tree to find out the total number of JQs present */ + for_each_compatible_node(np, NULL, "fsl,raideng-v1.0-job-queue") { + rc = of_property_read_u32(np, "reg", &off); + if (rc) { + dev_err(dev, "Reg property not found in JQ node\n"); + return -ENODEV; + } + /* Find out the Job Rings present under each JQ */ + for_each_child_of_node(np, child) { + rc = of_device_is_compatible(child, + "fsl,raideng-v1.0-job-ring"); + if (rc) { + fsl_re_chan_probe(ofdev, child, ridx++, off); + re_priv->total_chans++; + } + } + } + + dma_async_device_register(dma_dev); + + return 0; +} + +static void fsl_re_remove_chan(struct fsl_re_chan *chan) +{ + dma_pool_free(chan->re_dev->hw_desc_pool, chan->inb_ring_virt_addr, + chan->inb_phys_addr); + + dma_pool_free(chan->re_dev->hw_desc_pool, chan->oub_ring_virt_addr, + chan->oub_phys_addr); +} + +static int fsl_re_remove(struct platform_device *ofdev) +{ + struct fsl_re_drv_private *re_priv; + struct device *dev; + int i; + + dev = &ofdev->dev; + re_priv = dev_get_drvdata(dev); + + /* Cleanup chan related memory areas */ + for (i = 0; i < re_priv->total_chans; i++) + fsl_re_remove_chan(re_priv->re_jrs[i]); + + /* Unregister the driver */ + dma_async_device_unregister(&re_priv->dma_dev); + + return 0; +} + +static struct of_device_id fsl_re_ids[] = { + { .compatible = "fsl,raideng-v1.0", }, + {} +}; + +static struct platform_driver fsl_re_driver = { + .driver = { + .name = "fsl-raideng", + .owner = THIS_MODULE, + .of_match_table = fsl_re_ids, + }, + .probe = fsl_re_probe, + .remove = fsl_re_remove, +}; + +module_platform_driver(fsl_re_driver); + +MODULE_AUTHOR("Harninder Rai <harninder.rai@freescale.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Freescale RAID Engine Device Driver"); diff --git a/drivers/dma/fsl_raid.h b/drivers/dma/fsl_raid.h new file mode 100644 index 000000000..69d743c04 --- /dev/null +++ b/drivers/dma/fsl_raid.h @@ -0,0 +1,306 @@ +/* + * drivers/dma/fsl_raid.h + * + * Freescale RAID Engine device driver + * + * Author: + * Harninder Rai <harninder.rai@freescale.com> + * Naveen Burmi <naveenburmi@freescale.com> + * + * Rewrite: + * Xuelin Shi <xuelin.shi@freescale.com> + + * Copyright (c) 2010-2012 Freescale Semiconductor, Inc. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * * Neither the name of Freescale Semiconductor nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * ALTERNATIVELY, this software may be distributed under the terms of the + * GNU General Public License ("GPL") as published by the Free Software + * Foundation, either version 2 of that License or (at your option) any + * later version. + * + * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#define FSL_RE_MAX_CHANS 4 +#define FSL_RE_DPAA_MODE BIT(30) +#define FSL_RE_NON_DPAA_MODE BIT(31) +#define FSL_RE_GFM_POLY 0x1d000000 +#define FSL_RE_ADD_JOB(x) ((x) << 16) +#define FSL_RE_RMVD_JOB(x) ((x) << 16) +#define FSL_RE_CFG1_CBSI 0x08000000 +#define FSL_RE_CFG1_CBS0 0x00080000 +#define FSL_RE_SLOT_FULL_SHIFT 8 +#define FSL_RE_SLOT_FULL(x) ((x) >> FSL_RE_SLOT_FULL_SHIFT) +#define FSL_RE_SLOT_AVAIL_SHIFT 8 +#define FSL_RE_SLOT_AVAIL(x) ((x) >> FSL_RE_SLOT_AVAIL_SHIFT) +#define FSL_RE_PQ_OPCODE 0x1B +#define FSL_RE_XOR_OPCODE 0x1A +#define FSL_RE_MOVE_OPCODE 0x8 +#define FSL_RE_FRAME_ALIGN 16 +#define FSL_RE_BLOCK_SIZE 0x3 /* 4096 bytes */ +#define FSL_RE_CACHEABLE_IO 0x0 +#define FSL_RE_BUFFER_OUTPUT 0x0 +#define FSL_RE_INTR_ON_ERROR 0x1 +#define FSL_RE_DATA_DEP 0x1 +#define FSL_RE_ENABLE_DPI 0x0 +#define FSL_RE_RING_SIZE 0x400 +#define FSL_RE_RING_SIZE_MASK (FSL_RE_RING_SIZE - 1) +#define FSL_RE_RING_SIZE_SHIFT 8 +#define FSL_RE_ADDR_BIT_SHIFT 4 +#define FSL_RE_ADDR_BIT_MASK (BIT(FSL_RE_ADDR_BIT_SHIFT) - 1) +#define FSL_RE_ERROR 0x40000000 +#define FSL_RE_INTR 0x80000000 +#define FSL_RE_CLR_INTR 0x80000000 +#define FSL_RE_PAUSE 0x80000000 +#define FSL_RE_ENABLE 0x80000000 +#define FSL_RE_REG_LIODN_MASK 0x00000FFF + +#define FSL_RE_CDB_OPCODE_MASK 0xF8000000 +#define FSL_RE_CDB_OPCODE_SHIFT 27 +#define FSL_RE_CDB_EXCLEN_MASK 0x03000000 +#define FSL_RE_CDB_EXCLEN_SHIFT 24 +#define FSL_RE_CDB_EXCLQ1_MASK 0x00F00000 +#define FSL_RE_CDB_EXCLQ1_SHIFT 20 +#define FSL_RE_CDB_EXCLQ2_MASK 0x000F0000 +#define FSL_RE_CDB_EXCLQ2_SHIFT 16 +#define FSL_RE_CDB_BLKSIZE_MASK 0x0000C000 +#define FSL_RE_CDB_BLKSIZE_SHIFT 14 +#define FSL_RE_CDB_CACHE_MASK 0x00003000 +#define FSL_RE_CDB_CACHE_SHIFT 12 +#define FSL_RE_CDB_BUFFER_MASK 0x00000800 +#define FSL_RE_CDB_BUFFER_SHIFT 11 +#define FSL_RE_CDB_ERROR_MASK 0x00000400 +#define FSL_RE_CDB_ERROR_SHIFT 10 +#define FSL_RE_CDB_NRCS_MASK 0x0000003C +#define FSL_RE_CDB_NRCS_SHIFT 6 +#define FSL_RE_CDB_DEPEND_MASK 0x00000008 +#define FSL_RE_CDB_DEPEND_SHIFT 3 +#define FSL_RE_CDB_DPI_MASK 0x00000004 +#define FSL_RE_CDB_DPI_SHIFT 2 + +/* + * the largest cf block is 19*sizeof(struct cmpnd_frame), which is 304 bytes. + * here 19 = 1(cdb)+2(dest)+16(src), align to 64bytes, that is 320 bytes. + * the largest cdb block: struct pq_cdb which is 180 bytes, adding to cf block + * 320+180=500, align to 64bytes, that is 512 bytes. + */ +#define FSL_RE_CF_DESC_SIZE 320 +#define FSL_RE_CF_CDB_SIZE 512 +#define FSL_RE_CF_CDB_ALIGN 64 + +struct fsl_re_ctrl { + /* General Configuration Registers */ + __be32 global_config; /* Global Configuration Register */ + u8 rsvd1[4]; + __be32 galois_field_config; /* Galois Field Configuration Register */ + u8 rsvd2[4]; + __be32 jq_wrr_config; /* WRR Configuration register */ + u8 rsvd3[4]; + __be32 crc_config; /* CRC Configuration register */ + u8 rsvd4[228]; + __be32 system_reset; /* System Reset Register */ + u8 rsvd5[252]; + __be32 global_status; /* Global Status Register */ + u8 rsvd6[832]; + __be32 re_liodn_base; /* LIODN Base Register */ + u8 rsvd7[1712]; + __be32 re_version_id; /* Version ID register of RE */ + __be32 re_version_id_2; /* Version ID 2 register of RE */ + u8 rsvd8[512]; + __be32 host_config; /* Host I/F Configuration Register */ +}; + +struct fsl_re_chan_cfg { + /* Registers for JR interface */ + __be32 jr_config_0; /* Job Queue Configuration 0 Register */ + __be32 jr_config_1; /* Job Queue Configuration 1 Register */ + __be32 jr_interrupt_status; /* Job Queue Interrupt Status Register */ + u8 rsvd1[4]; + __be32 jr_command; /* Job Queue Command Register */ + u8 rsvd2[4]; + __be32 jr_status; /* Job Queue Status Register */ + u8 rsvd3[228]; + + /* Input Ring */ + __be32 inbring_base_h; /* Inbound Ring Base Address Register - High */ + __be32 inbring_base_l; /* Inbound Ring Base Address Register - Low */ + __be32 inbring_size; /* Inbound Ring Size Register */ + u8 rsvd4[4]; + __be32 inbring_slot_avail; /* Inbound Ring Slot Available Register */ + u8 rsvd5[4]; + __be32 inbring_add_job; /* Inbound Ring Add Job Register */ + u8 rsvd6[4]; + __be32 inbring_cnsmr_indx; /* Inbound Ring Consumer Index Register */ + u8 rsvd7[220]; + + /* Output Ring */ + __be32 oubring_base_h; /* Outbound Ring Base Address Register - High */ + __be32 oubring_base_l; /* Outbound Ring Base Address Register - Low */ + __be32 oubring_size; /* Outbound Ring Size Register */ + u8 rsvd8[4]; + __be32 oubring_job_rmvd; /* Outbound Ring Job Removed Register */ + u8 rsvd9[4]; + __be32 oubring_slot_full; /* Outbound Ring Slot Full Register */ + u8 rsvd10[4]; + __be32 oubring_prdcr_indx; /* Outbound Ring Producer Index */ +}; + +/* + * Command Descriptor Block (CDB) for unicast move command. + * In RAID Engine terms, memcpy is done through move command + */ +struct fsl_re_move_cdb { + __be32 cdb32; +}; + +/* Data protection/integrity related fields */ +#define FSL_RE_DPI_APPS_MASK 0xC0000000 +#define FSL_RE_DPI_APPS_SHIFT 30 +#define FSL_RE_DPI_REF_MASK 0x30000000 +#define FSL_RE_DPI_REF_SHIFT 28 +#define FSL_RE_DPI_GUARD_MASK 0x0C000000 +#define FSL_RE_DPI_GUARD_SHIFT 26 +#define FSL_RE_DPI_ATTR_MASK 0x03000000 +#define FSL_RE_DPI_ATTR_SHIFT 24 +#define FSL_RE_DPI_META_MASK 0x0000FFFF + +struct fsl_re_dpi { + __be32 dpi32; + __be32 ref; +}; + +/* + * CDB for GenQ command. In RAID Engine terminology, XOR is + * done through this command + */ +struct fsl_re_xor_cdb { + __be32 cdb32; + u8 gfm[16]; + struct fsl_re_dpi dpi_dest_spec; + struct fsl_re_dpi dpi_src_spec[16]; +}; + +/* CDB for no-op command */ +struct fsl_re_noop_cdb { + __be32 cdb32; +}; + +/* + * CDB for GenQQ command. In RAID Engine terminology, P/Q is + * done through this command + */ +struct fsl_re_pq_cdb { + __be32 cdb32; + u8 gfm_q1[16]; + u8 gfm_q2[16]; + struct fsl_re_dpi dpi_dest_spec[2]; + struct fsl_re_dpi dpi_src_spec[16]; +}; + +/* Compound frame */ +#define FSL_RE_CF_ADDR_HIGH_MASK 0x000000FF +#define FSL_RE_CF_EXT_MASK 0x80000000 +#define FSL_RE_CF_EXT_SHIFT 31 +#define FSL_RE_CF_FINAL_MASK 0x40000000 +#define FSL_RE_CF_FINAL_SHIFT 30 +#define FSL_RE_CF_LENGTH_MASK 0x000FFFFF +#define FSL_RE_CF_BPID_MASK 0x00FF0000 +#define FSL_RE_CF_BPID_SHIFT 16 +#define FSL_RE_CF_OFFSET_MASK 0x00001FFF + +struct fsl_re_cmpnd_frame { + __be32 addr_high; + __be32 addr_low; + __be32 efrl32; + __be32 rbro32; +}; + +/* Frame descriptor */ +#define FSL_RE_HWDESC_LIODN_MASK 0x3F000000 +#define FSL_RE_HWDESC_LIODN_SHIFT 24 +#define FSL_RE_HWDESC_BPID_MASK 0x00FF0000 +#define FSL_RE_HWDESC_BPID_SHIFT 16 +#define FSL_RE_HWDESC_ELIODN_MASK 0x0000F000 +#define FSL_RE_HWDESC_ELIODN_SHIFT 12 +#define FSL_RE_HWDESC_FMT_SHIFT 29 +#define FSL_RE_HWDESC_FMT_MASK (0x3 << FSL_RE_HWDESC_FMT_SHIFT) + +struct fsl_re_hw_desc { + __be32 lbea32; + __be32 addr_low; + __be32 fmt32; + __be32 status; +}; + +/* Raid Engine device private data */ +struct fsl_re_drv_private { + u8 total_chans; + struct dma_device dma_dev; + struct fsl_re_ctrl *re_regs; + struct fsl_re_chan *re_jrs[FSL_RE_MAX_CHANS]; + struct dma_pool *cf_desc_pool; + struct dma_pool *hw_desc_pool; +}; + +/* Per job ring data structure */ +struct fsl_re_chan { + char name[16]; + spinlock_t desc_lock; /* queue lock */ + struct list_head ack_q; /* wait to acked queue */ + struct list_head active_q; /* already issued on hw, not completed */ + struct list_head submit_q; + struct list_head free_q; /* alloc available queue */ + struct device *dev; + struct fsl_re_drv_private *re_dev; + struct dma_chan chan; + struct fsl_re_chan_cfg *jrregs; + int irq; + struct tasklet_struct irqtask; + u32 alloc_count; + + /* hw descriptor ring for inbound queue*/ + dma_addr_t inb_phys_addr; + struct fsl_re_hw_desc *inb_ring_virt_addr; + u32 inb_count; + + /* hw descriptor ring for outbound queue */ + dma_addr_t oub_phys_addr; + struct fsl_re_hw_desc *oub_ring_virt_addr; + u32 oub_count; +}; + +/* Async transaction descriptor */ +struct fsl_re_desc { + struct dma_async_tx_descriptor async_tx; + struct list_head node; + struct fsl_re_hw_desc hwdesc; + struct fsl_re_chan *re_chan; + + /* hwdesc will point to cf_addr */ + void *cf_addr; + dma_addr_t cf_paddr; + + void *cdb_addr; + dma_addr_t cdb_paddr; + int status; +}; diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c new file mode 100644 index 000000000..300f821f1 --- /dev/null +++ b/drivers/dma/fsldma.c @@ -0,0 +1,1547 @@ +/* + * Freescale MPC85xx, MPC83xx DMA Engine support + * + * Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved. + * + * Author: + * Zhang Wei <wei.zhang@freescale.com>, Jul 2007 + * Ebony Zhu <ebony.zhu@freescale.com>, May 2007 + * + * Description: + * DMA engine driver for Freescale MPC8540 DMA controller, which is + * also fit for MPC8560, MPC8555, MPC8548, MPC8641, and etc. + * The support for MPC8349 DMA controller is also added. + * + * This driver instructs the DMA controller to issue the PCI Read Multiple + * command for PCI read operations, instead of using the default PCI Read Line + * command. Please be aware that this setting may result in read pre-fetching + * on some platforms. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmapool.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/fsldma.h> +#include "dmaengine.h" +#include "fsldma.h" + +#define chan_dbg(chan, fmt, arg...) \ + dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg) +#define chan_err(chan, fmt, arg...) \ + dev_err(chan->dev, "%s: " fmt, chan->name, ##arg) + +static const char msg_ld_oom[] = "No free memory for link descriptor"; + +/* + * Register Helpers + */ + +static void set_sr(struct fsldma_chan *chan, u32 val) +{ + DMA_OUT(chan, &chan->regs->sr, val, 32); +} + +static u32 get_sr(struct fsldma_chan *chan) +{ + return DMA_IN(chan, &chan->regs->sr, 32); +} + +static void set_mr(struct fsldma_chan *chan, u32 val) +{ + DMA_OUT(chan, &chan->regs->mr, val, 32); +} + +static u32 get_mr(struct fsldma_chan *chan) +{ + return DMA_IN(chan, &chan->regs->mr, 32); +} + +static void set_cdar(struct fsldma_chan *chan, dma_addr_t addr) +{ + DMA_OUT(chan, &chan->regs->cdar, addr | FSL_DMA_SNEN, 64); +} + +static dma_addr_t get_cdar(struct fsldma_chan *chan) +{ + return DMA_IN(chan, &chan->regs->cdar, 64) & ~FSL_DMA_SNEN; +} + +static void set_bcr(struct fsldma_chan *chan, u32 val) +{ + DMA_OUT(chan, &chan->regs->bcr, val, 32); +} + +static u32 get_bcr(struct fsldma_chan *chan) +{ + return DMA_IN(chan, &chan->regs->bcr, 32); +} + +/* + * Descriptor Helpers + */ + +static void set_desc_cnt(struct fsldma_chan *chan, + struct fsl_dma_ld_hw *hw, u32 count) +{ + hw->count = CPU_TO_DMA(chan, count, 32); +} + +static void set_desc_src(struct fsldma_chan *chan, + struct fsl_dma_ld_hw *hw, dma_addr_t src) +{ + u64 snoop_bits; + + snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) + ? ((u64)FSL_DMA_SATR_SREADTYPE_SNOOP_READ << 32) : 0; + hw->src_addr = CPU_TO_DMA(chan, snoop_bits | src, 64); +} + +static void set_desc_dst(struct fsldma_chan *chan, + struct fsl_dma_ld_hw *hw, dma_addr_t dst) +{ + u64 snoop_bits; + + snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) + ? ((u64)FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE << 32) : 0; + hw->dst_addr = CPU_TO_DMA(chan, snoop_bits | dst, 64); +} + +static void set_desc_next(struct fsldma_chan *chan, + struct fsl_dma_ld_hw *hw, dma_addr_t next) +{ + u64 snoop_bits; + + snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX) + ? FSL_DMA_SNEN : 0; + hw->next_ln_addr = CPU_TO_DMA(chan, snoop_bits | next, 64); +} + +static void set_ld_eol(struct fsldma_chan *chan, struct fsl_desc_sw *desc) +{ + u64 snoop_bits; + + snoop_bits = ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_83XX) + ? FSL_DMA_SNEN : 0; + + desc->hw.next_ln_addr = CPU_TO_DMA(chan, + DMA_TO_CPU(chan, desc->hw.next_ln_addr, 64) | FSL_DMA_EOL + | snoop_bits, 64); +} + +/* + * DMA Engine Hardware Control Helpers + */ + +static void dma_init(struct fsldma_chan *chan) +{ + /* Reset the channel */ + set_mr(chan, 0); + + switch (chan->feature & FSL_DMA_IP_MASK) { + case FSL_DMA_IP_85XX: + /* Set the channel to below modes: + * EIE - Error interrupt enable + * EOLNIE - End of links interrupt enable + * BWC - Bandwidth sharing among channels + */ + set_mr(chan, FSL_DMA_MR_BWC | FSL_DMA_MR_EIE + | FSL_DMA_MR_EOLNIE); + break; + case FSL_DMA_IP_83XX: + /* Set the channel to below modes: + * EOTIE - End-of-transfer interrupt enable + * PRC_RM - PCI read multiple + */ + set_mr(chan, FSL_DMA_MR_EOTIE | FSL_DMA_MR_PRC_RM); + break; + } +} + +static int dma_is_idle(struct fsldma_chan *chan) +{ + u32 sr = get_sr(chan); + return (!(sr & FSL_DMA_SR_CB)) || (sr & FSL_DMA_SR_CH); +} + +/* + * Start the DMA controller + * + * Preconditions: + * - the CDAR register must point to the start descriptor + * - the MRn[CS] bit must be cleared + */ +static void dma_start(struct fsldma_chan *chan) +{ + u32 mode; + + mode = get_mr(chan); + + if (chan->feature & FSL_DMA_CHAN_PAUSE_EXT) { + set_bcr(chan, 0); + mode |= FSL_DMA_MR_EMP_EN; + } else { + mode &= ~FSL_DMA_MR_EMP_EN; + } + + if (chan->feature & FSL_DMA_CHAN_START_EXT) { + mode |= FSL_DMA_MR_EMS_EN; + } else { + mode &= ~FSL_DMA_MR_EMS_EN; + mode |= FSL_DMA_MR_CS; + } + + set_mr(chan, mode); +} + +static void dma_halt(struct fsldma_chan *chan) +{ + u32 mode; + int i; + + /* read the mode register */ + mode = get_mr(chan); + + /* + * The 85xx controller supports channel abort, which will stop + * the current transfer. On 83xx, this bit is the transfer error + * mask bit, which should not be changed. + */ + if ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) { + mode |= FSL_DMA_MR_CA; + set_mr(chan, mode); + + mode &= ~FSL_DMA_MR_CA; + } + + /* stop the DMA controller */ + mode &= ~(FSL_DMA_MR_CS | FSL_DMA_MR_EMS_EN); + set_mr(chan, mode); + + /* wait for the DMA controller to become idle */ + for (i = 0; i < 100; i++) { + if (dma_is_idle(chan)) + return; + + udelay(10); + } + + if (!dma_is_idle(chan)) + chan_err(chan, "DMA halt timeout!\n"); +} + +/** + * fsl_chan_set_src_loop_size - Set source address hold transfer size + * @chan : Freescale DMA channel + * @size : Address loop size, 0 for disable loop + * + * The set source address hold transfer size. The source + * address hold or loop transfer size is when the DMA transfer + * data from source address (SA), if the loop size is 4, the DMA will + * read data from SA, SA + 1, SA + 2, SA + 3, then loop back to SA, + * SA + 1 ... and so on. + */ +static void fsl_chan_set_src_loop_size(struct fsldma_chan *chan, int size) +{ + u32 mode; + + mode = get_mr(chan); + + switch (size) { + case 0: + mode &= ~FSL_DMA_MR_SAHE; + break; + case 1: + case 2: + case 4: + case 8: + mode |= FSL_DMA_MR_SAHE | (__ilog2(size) << 14); + break; + } + + set_mr(chan, mode); +} + +/** + * fsl_chan_set_dst_loop_size - Set destination address hold transfer size + * @chan : Freescale DMA channel + * @size : Address loop size, 0 for disable loop + * + * The set destination address hold transfer size. The destination + * address hold or loop transfer size is when the DMA transfer + * data to destination address (TA), if the loop size is 4, the DMA will + * write data to TA, TA + 1, TA + 2, TA + 3, then loop back to TA, + * TA + 1 ... and so on. + */ +static void fsl_chan_set_dst_loop_size(struct fsldma_chan *chan, int size) +{ + u32 mode; + + mode = get_mr(chan); + + switch (size) { + case 0: + mode &= ~FSL_DMA_MR_DAHE; + break; + case 1: + case 2: + case 4: + case 8: + mode |= FSL_DMA_MR_DAHE | (__ilog2(size) << 16); + break; + } + + set_mr(chan, mode); +} + +/** + * fsl_chan_set_request_count - Set DMA Request Count for external control + * @chan : Freescale DMA channel + * @size : Number of bytes to transfer in a single request + * + * The Freescale DMA channel can be controlled by the external signal DREQ#. + * The DMA request count is how many bytes are allowed to transfer before + * pausing the channel, after which a new assertion of DREQ# resumes channel + * operation. + * + * A size of 0 disables external pause control. The maximum size is 1024. + */ +static void fsl_chan_set_request_count(struct fsldma_chan *chan, int size) +{ + u32 mode; + + BUG_ON(size > 1024); + + mode = get_mr(chan); + mode |= (__ilog2(size) << 24) & 0x0f000000; + + set_mr(chan, mode); +} + +/** + * fsl_chan_toggle_ext_pause - Toggle channel external pause status + * @chan : Freescale DMA channel + * @enable : 0 is disabled, 1 is enabled. + * + * The Freescale DMA channel can be controlled by the external signal DREQ#. + * The DMA Request Count feature should be used in addition to this feature + * to set the number of bytes to transfer before pausing the channel. + */ +static void fsl_chan_toggle_ext_pause(struct fsldma_chan *chan, int enable) +{ + if (enable) + chan->feature |= FSL_DMA_CHAN_PAUSE_EXT; + else + chan->feature &= ~FSL_DMA_CHAN_PAUSE_EXT; +} + +/** + * fsl_chan_toggle_ext_start - Toggle channel external start status + * @chan : Freescale DMA channel + * @enable : 0 is disabled, 1 is enabled. + * + * If enable the external start, the channel can be started by an + * external DMA start pin. So the dma_start() does not start the + * transfer immediately. The DMA channel will wait for the + * control pin asserted. + */ +static void fsl_chan_toggle_ext_start(struct fsldma_chan *chan, int enable) +{ + if (enable) + chan->feature |= FSL_DMA_CHAN_START_EXT; + else + chan->feature &= ~FSL_DMA_CHAN_START_EXT; +} + +int fsl_dma_external_start(struct dma_chan *dchan, int enable) +{ + struct fsldma_chan *chan; + + if (!dchan) + return -EINVAL; + + chan = to_fsl_chan(dchan); + + fsl_chan_toggle_ext_start(chan, enable); + return 0; +} +EXPORT_SYMBOL_GPL(fsl_dma_external_start); + +static void append_ld_queue(struct fsldma_chan *chan, struct fsl_desc_sw *desc) +{ + struct fsl_desc_sw *tail = to_fsl_desc(chan->ld_pending.prev); + + if (list_empty(&chan->ld_pending)) + goto out_splice; + + /* + * Add the hardware descriptor to the chain of hardware descriptors + * that already exists in memory. + * + * This will un-set the EOL bit of the existing transaction, and the + * last link in this transaction will become the EOL descriptor. + */ + set_desc_next(chan, &tail->hw, desc->async_tx.phys); + + /* + * Add the software descriptor and all children to the list + * of pending transactions + */ +out_splice: + list_splice_tail_init(&desc->tx_list, &chan->ld_pending); +} + +static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct fsldma_chan *chan = to_fsl_chan(tx->chan); + struct fsl_desc_sw *desc = tx_to_fsl_desc(tx); + struct fsl_desc_sw *child; + dma_cookie_t cookie = -EINVAL; + + spin_lock_bh(&chan->desc_lock); + +#ifdef CONFIG_PM + if (unlikely(chan->pm_state != RUNNING)) { + chan_dbg(chan, "cannot submit due to suspend\n"); + spin_unlock_bh(&chan->desc_lock); + return -1; + } +#endif + + /* + * assign cookies to all of the software descriptors + * that make up this transaction + */ + list_for_each_entry(child, &desc->tx_list, node) { + cookie = dma_cookie_assign(&child->async_tx); + } + + /* put this transaction onto the tail of the pending queue */ + append_ld_queue(chan, desc); + + spin_unlock_bh(&chan->desc_lock); + + return cookie; +} + +/** + * fsl_dma_free_descriptor - Free descriptor from channel's DMA pool. + * @chan : Freescale DMA channel + * @desc: descriptor to be freed + */ +static void fsl_dma_free_descriptor(struct fsldma_chan *chan, + struct fsl_desc_sw *desc) +{ + list_del(&desc->node); + chan_dbg(chan, "LD %p free\n", desc); + dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys); +} + +/** + * fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool. + * @chan : Freescale DMA channel + * + * Return - The descriptor allocated. NULL for failed. + */ +static struct fsl_desc_sw *fsl_dma_alloc_descriptor(struct fsldma_chan *chan) +{ + struct fsl_desc_sw *desc; + dma_addr_t pdesc; + + desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc); + if (!desc) { + chan_dbg(chan, "out of memory for link descriptor\n"); + return NULL; + } + + memset(desc, 0, sizeof(*desc)); + INIT_LIST_HEAD(&desc->tx_list); + dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); + desc->async_tx.tx_submit = fsl_dma_tx_submit; + desc->async_tx.phys = pdesc; + + chan_dbg(chan, "LD %p allocated\n", desc); + + return desc; +} + +/** + * fsldma_clean_completed_descriptor - free all descriptors which + * has been completed and acked + * @chan: Freescale DMA channel + * + * This function is used on all completed and acked descriptors. + * All descriptors should only be freed in this function. + */ +static void fsldma_clean_completed_descriptor(struct fsldma_chan *chan) +{ + struct fsl_desc_sw *desc, *_desc; + + /* Run the callback for each descriptor, in order */ + list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node) + if (async_tx_test_ack(&desc->async_tx)) + fsl_dma_free_descriptor(chan, desc); +} + +/** + * fsldma_run_tx_complete_actions - cleanup a single link descriptor + * @chan: Freescale DMA channel + * @desc: descriptor to cleanup and free + * @cookie: Freescale DMA transaction identifier + * + * This function is used on a descriptor which has been executed by the DMA + * controller. It will run any callbacks, submit any dependencies. + */ +static dma_cookie_t fsldma_run_tx_complete_actions(struct fsldma_chan *chan, + struct fsl_desc_sw *desc, dma_cookie_t cookie) +{ + struct dma_async_tx_descriptor *txd = &desc->async_tx; + dma_cookie_t ret = cookie; + + BUG_ON(txd->cookie < 0); + + if (txd->cookie > 0) { + ret = txd->cookie; + + /* Run the link descriptor callback function */ + if (txd->callback) { + chan_dbg(chan, "LD %p callback\n", desc); + txd->callback(txd->callback_param); + } + } + + /* Run any dependencies */ + dma_run_dependencies(txd); + + return ret; +} + +/** + * fsldma_clean_running_descriptor - move the completed descriptor from + * ld_running to ld_completed + * @chan: Freescale DMA channel + * @desc: the descriptor which is completed + * + * Free the descriptor directly if acked by async_tx api, or move it to + * queue ld_completed. + */ +static void fsldma_clean_running_descriptor(struct fsldma_chan *chan, + struct fsl_desc_sw *desc) +{ + /* Remove from the list of transactions */ + list_del(&desc->node); + + /* + * the client is allowed to attach dependent operations + * until 'ack' is set + */ + if (!async_tx_test_ack(&desc->async_tx)) { + /* + * Move this descriptor to the list of descriptors which is + * completed, but still awaiting the 'ack' bit to be set. + */ + list_add_tail(&desc->node, &chan->ld_completed); + return; + } + + dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys); +} + +/** + * fsl_chan_xfer_ld_queue - transfer any pending transactions + * @chan : Freescale DMA channel + * + * HARDWARE STATE: idle + * LOCKING: must hold chan->desc_lock + */ +static void fsl_chan_xfer_ld_queue(struct fsldma_chan *chan) +{ + struct fsl_desc_sw *desc; + + /* + * If the list of pending descriptors is empty, then we + * don't need to do any work at all + */ + if (list_empty(&chan->ld_pending)) { + chan_dbg(chan, "no pending LDs\n"); + return; + } + + /* + * The DMA controller is not idle, which means that the interrupt + * handler will start any queued transactions when it runs after + * this transaction finishes + */ + if (!chan->idle) { + chan_dbg(chan, "DMA controller still busy\n"); + return; + } + + /* + * If there are some link descriptors which have not been + * transferred, we need to start the controller + */ + + /* + * Move all elements from the queue of pending transactions + * onto the list of running transactions + */ + chan_dbg(chan, "idle, starting controller\n"); + desc = list_first_entry(&chan->ld_pending, struct fsl_desc_sw, node); + list_splice_tail_init(&chan->ld_pending, &chan->ld_running); + + /* + * The 85xx DMA controller doesn't clear the channel start bit + * automatically at the end of a transfer. Therefore we must clear + * it in software before starting the transfer. + */ + if ((chan->feature & FSL_DMA_IP_MASK) == FSL_DMA_IP_85XX) { + u32 mode; + + mode = get_mr(chan); + mode &= ~FSL_DMA_MR_CS; + set_mr(chan, mode); + } + + /* + * Program the descriptor's address into the DMA controller, + * then start the DMA transaction + */ + set_cdar(chan, desc->async_tx.phys); + get_cdar(chan); + + dma_start(chan); + chan->idle = false; +} + +/** + * fsldma_cleanup_descriptors - cleanup link descriptors which are completed + * and move them to ld_completed to free until flag 'ack' is set + * @chan: Freescale DMA channel + * + * This function is used on descriptors which have been executed by the DMA + * controller. It will run any callbacks, submit any dependencies, then + * free these descriptors if flag 'ack' is set. + */ +static void fsldma_cleanup_descriptors(struct fsldma_chan *chan) +{ + struct fsl_desc_sw *desc, *_desc; + dma_cookie_t cookie = 0; + dma_addr_t curr_phys = get_cdar(chan); + int seen_current = 0; + + fsldma_clean_completed_descriptor(chan); + + /* Run the callback for each descriptor, in order */ + list_for_each_entry_safe(desc, _desc, &chan->ld_running, node) { + /* + * do not advance past the current descriptor loaded into the + * hardware channel, subsequent descriptors are either in + * process or have not been submitted + */ + if (seen_current) + break; + + /* + * stop the search if we reach the current descriptor and the + * channel is busy + */ + if (desc->async_tx.phys == curr_phys) { + seen_current = 1; + if (!dma_is_idle(chan)) + break; + } + + cookie = fsldma_run_tx_complete_actions(chan, desc, cookie); + + fsldma_clean_running_descriptor(chan, desc); + } + + /* + * Start any pending transactions automatically + * + * In the ideal case, we keep the DMA controller busy while we go + * ahead and free the descriptors below. + */ + fsl_chan_xfer_ld_queue(chan); + + if (cookie > 0) + chan->common.completed_cookie = cookie; +} + +/** + * fsl_dma_alloc_chan_resources - Allocate resources for DMA channel. + * @chan : Freescale DMA channel + * + * This function will create a dma pool for descriptor allocation. + * + * Return - The number of descriptors allocated. + */ +static int fsl_dma_alloc_chan_resources(struct dma_chan *dchan) +{ + struct fsldma_chan *chan = to_fsl_chan(dchan); + + /* Has this channel already been allocated? */ + if (chan->desc_pool) + return 1; + + /* + * We need the descriptor to be aligned to 32bytes + * for meeting FSL DMA specification requirement. + */ + chan->desc_pool = dma_pool_create(chan->name, chan->dev, + sizeof(struct fsl_desc_sw), + __alignof__(struct fsl_desc_sw), 0); + if (!chan->desc_pool) { + chan_err(chan, "unable to allocate descriptor pool\n"); + return -ENOMEM; + } + + /* there is at least one descriptor free to be allocated */ + return 1; +} + +/** + * fsldma_free_desc_list - Free all descriptors in a queue + * @chan: Freescae DMA channel + * @list: the list to free + * + * LOCKING: must hold chan->desc_lock + */ +static void fsldma_free_desc_list(struct fsldma_chan *chan, + struct list_head *list) +{ + struct fsl_desc_sw *desc, *_desc; + + list_for_each_entry_safe(desc, _desc, list, node) + fsl_dma_free_descriptor(chan, desc); +} + +static void fsldma_free_desc_list_reverse(struct fsldma_chan *chan, + struct list_head *list) +{ + struct fsl_desc_sw *desc, *_desc; + + list_for_each_entry_safe_reverse(desc, _desc, list, node) + fsl_dma_free_descriptor(chan, desc); +} + +/** + * fsl_dma_free_chan_resources - Free all resources of the channel. + * @chan : Freescale DMA channel + */ +static void fsl_dma_free_chan_resources(struct dma_chan *dchan) +{ + struct fsldma_chan *chan = to_fsl_chan(dchan); + + chan_dbg(chan, "free all channel resources\n"); + spin_lock_bh(&chan->desc_lock); + fsldma_cleanup_descriptors(chan); + fsldma_free_desc_list(chan, &chan->ld_pending); + fsldma_free_desc_list(chan, &chan->ld_running); + fsldma_free_desc_list(chan, &chan->ld_completed); + spin_unlock_bh(&chan->desc_lock); + + dma_pool_destroy(chan->desc_pool); + chan->desc_pool = NULL; +} + +static struct dma_async_tx_descriptor * +fsl_dma_prep_memcpy(struct dma_chan *dchan, + dma_addr_t dma_dst, dma_addr_t dma_src, + size_t len, unsigned long flags) +{ + struct fsldma_chan *chan; + struct fsl_desc_sw *first = NULL, *prev = NULL, *new; + size_t copy; + + if (!dchan) + return NULL; + + if (!len) + return NULL; + + chan = to_fsl_chan(dchan); + + do { + + /* Allocate the link descriptor from DMA pool */ + new = fsl_dma_alloc_descriptor(chan); + if (!new) { + chan_err(chan, "%s\n", msg_ld_oom); + goto fail; + } + + copy = min(len, (size_t)FSL_DMA_BCR_MAX_CNT); + + set_desc_cnt(chan, &new->hw, copy); + set_desc_src(chan, &new->hw, dma_src); + set_desc_dst(chan, &new->hw, dma_dst); + + if (!first) + first = new; + else + set_desc_next(chan, &prev->hw, new->async_tx.phys); + + new->async_tx.cookie = 0; + async_tx_ack(&new->async_tx); + + prev = new; + len -= copy; + dma_src += copy; + dma_dst += copy; + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + } while (len); + + new->async_tx.flags = flags; /* client is in control of this ack */ + new->async_tx.cookie = -EBUSY; + + /* Set End-of-link to the last link descriptor of new list */ + set_ld_eol(chan, new); + + return &first->async_tx; + +fail: + if (!first) + return NULL; + + fsldma_free_desc_list_reverse(chan, &first->tx_list); + return NULL; +} + +static struct dma_async_tx_descriptor *fsl_dma_prep_sg(struct dma_chan *dchan, + struct scatterlist *dst_sg, unsigned int dst_nents, + struct scatterlist *src_sg, unsigned int src_nents, + unsigned long flags) +{ + struct fsl_desc_sw *first = NULL, *prev = NULL, *new = NULL; + struct fsldma_chan *chan = to_fsl_chan(dchan); + size_t dst_avail, src_avail; + dma_addr_t dst, src; + size_t len; + + /* basic sanity checks */ + if (dst_nents == 0 || src_nents == 0) + return NULL; + + if (dst_sg == NULL || src_sg == NULL) + return NULL; + + /* + * TODO: should we check that both scatterlists have the same + * TODO: number of bytes in total? Is that really an error? + */ + + /* get prepared for the loop */ + dst_avail = sg_dma_len(dst_sg); + src_avail = sg_dma_len(src_sg); + + /* run until we are out of scatterlist entries */ + while (true) { + + /* create the largest transaction possible */ + len = min_t(size_t, src_avail, dst_avail); + len = min_t(size_t, len, FSL_DMA_BCR_MAX_CNT); + if (len == 0) + goto fetch; + + dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail; + src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail; + + /* allocate and populate the descriptor */ + new = fsl_dma_alloc_descriptor(chan); + if (!new) { + chan_err(chan, "%s\n", msg_ld_oom); + goto fail; + } + + set_desc_cnt(chan, &new->hw, len); + set_desc_src(chan, &new->hw, src); + set_desc_dst(chan, &new->hw, dst); + + if (!first) + first = new; + else + set_desc_next(chan, &prev->hw, new->async_tx.phys); + + new->async_tx.cookie = 0; + async_tx_ack(&new->async_tx); + prev = new; + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + + /* update metadata */ + dst_avail -= len; + src_avail -= len; + +fetch: + /* fetch the next dst scatterlist entry */ + if (dst_avail == 0) { + + /* no more entries: we're done */ + if (dst_nents == 0) + break; + + /* fetch the next entry: if there are no more: done */ + dst_sg = sg_next(dst_sg); + if (dst_sg == NULL) + break; + + dst_nents--; + dst_avail = sg_dma_len(dst_sg); + } + + /* fetch the next src scatterlist entry */ + if (src_avail == 0) { + + /* no more entries: we're done */ + if (src_nents == 0) + break; + + /* fetch the next entry: if there are no more: done */ + src_sg = sg_next(src_sg); + if (src_sg == NULL) + break; + + src_nents--; + src_avail = sg_dma_len(src_sg); + } + } + + new->async_tx.flags = flags; /* client is in control of this ack */ + new->async_tx.cookie = -EBUSY; + + /* Set End-of-link to the last link descriptor of new list */ + set_ld_eol(chan, new); + + return &first->async_tx; + +fail: + if (!first) + return NULL; + + fsldma_free_desc_list_reverse(chan, &first->tx_list); + return NULL; +} + +static int fsl_dma_device_terminate_all(struct dma_chan *dchan) +{ + struct fsldma_chan *chan; + + if (!dchan) + return -EINVAL; + + chan = to_fsl_chan(dchan); + + spin_lock_bh(&chan->desc_lock); + + /* Halt the DMA engine */ + dma_halt(chan); + + /* Remove and free all of the descriptors in the LD queue */ + fsldma_free_desc_list(chan, &chan->ld_pending); + fsldma_free_desc_list(chan, &chan->ld_running); + fsldma_free_desc_list(chan, &chan->ld_completed); + chan->idle = true; + + spin_unlock_bh(&chan->desc_lock); + return 0; +} + +static int fsl_dma_device_config(struct dma_chan *dchan, + struct dma_slave_config *config) +{ + struct fsldma_chan *chan; + int size; + + if (!dchan) + return -EINVAL; + + chan = to_fsl_chan(dchan); + + /* make sure the channel supports setting burst size */ + if (!chan->set_request_count) + return -ENXIO; + + /* we set the controller burst size depending on direction */ + if (config->direction == DMA_MEM_TO_DEV) + size = config->dst_addr_width * config->dst_maxburst; + else + size = config->src_addr_width * config->src_maxburst; + + chan->set_request_count(chan, size); + return 0; +} + + +/** + * fsl_dma_memcpy_issue_pending - Issue the DMA start command + * @chan : Freescale DMA channel + */ +static void fsl_dma_memcpy_issue_pending(struct dma_chan *dchan) +{ + struct fsldma_chan *chan = to_fsl_chan(dchan); + + spin_lock_bh(&chan->desc_lock); + fsl_chan_xfer_ld_queue(chan); + spin_unlock_bh(&chan->desc_lock); +} + +/** + * fsl_tx_status - Determine the DMA status + * @chan : Freescale DMA channel + */ +static enum dma_status fsl_tx_status(struct dma_chan *dchan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct fsldma_chan *chan = to_fsl_chan(dchan); + enum dma_status ret; + + ret = dma_cookie_status(dchan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + spin_lock_bh(&chan->desc_lock); + fsldma_cleanup_descriptors(chan); + spin_unlock_bh(&chan->desc_lock); + + return dma_cookie_status(dchan, cookie, txstate); +} + +/*----------------------------------------------------------------------------*/ +/* Interrupt Handling */ +/*----------------------------------------------------------------------------*/ + +static irqreturn_t fsldma_chan_irq(int irq, void *data) +{ + struct fsldma_chan *chan = data; + u32 stat; + + /* save and clear the status register */ + stat = get_sr(chan); + set_sr(chan, stat); + chan_dbg(chan, "irq: stat = 0x%x\n", stat); + + /* check that this was really our device */ + stat &= ~(FSL_DMA_SR_CB | FSL_DMA_SR_CH); + if (!stat) + return IRQ_NONE; + + if (stat & FSL_DMA_SR_TE) + chan_err(chan, "Transfer Error!\n"); + + /* + * Programming Error + * The DMA_INTERRUPT async_tx is a NULL transfer, which will + * trigger a PE interrupt. + */ + if (stat & FSL_DMA_SR_PE) { + chan_dbg(chan, "irq: Programming Error INT\n"); + stat &= ~FSL_DMA_SR_PE; + if (get_bcr(chan) != 0) + chan_err(chan, "Programming Error!\n"); + } + + /* + * For MPC8349, EOCDI event need to update cookie + * and start the next transfer if it exist. + */ + if (stat & FSL_DMA_SR_EOCDI) { + chan_dbg(chan, "irq: End-of-Chain link INT\n"); + stat &= ~FSL_DMA_SR_EOCDI; + } + + /* + * If it current transfer is the end-of-transfer, + * we should clear the Channel Start bit for + * prepare next transfer. + */ + if (stat & FSL_DMA_SR_EOLNI) { + chan_dbg(chan, "irq: End-of-link INT\n"); + stat &= ~FSL_DMA_SR_EOLNI; + } + + /* check that the DMA controller is really idle */ + if (!dma_is_idle(chan)) + chan_err(chan, "irq: controller not idle!\n"); + + /* check that we handled all of the bits */ + if (stat) + chan_err(chan, "irq: unhandled sr 0x%08x\n", stat); + + /* + * Schedule the tasklet to handle all cleanup of the current + * transaction. It will start a new transaction if there is + * one pending. + */ + tasklet_schedule(&chan->tasklet); + chan_dbg(chan, "irq: Exit\n"); + return IRQ_HANDLED; +} + +static void dma_do_tasklet(unsigned long data) +{ + struct fsldma_chan *chan = (struct fsldma_chan *)data; + + chan_dbg(chan, "tasklet entry\n"); + + spin_lock_bh(&chan->desc_lock); + + /* the hardware is now idle and ready for more */ + chan->idle = true; + + /* Run all cleanup for descriptors which have been completed */ + fsldma_cleanup_descriptors(chan); + + spin_unlock_bh(&chan->desc_lock); + + chan_dbg(chan, "tasklet exit\n"); +} + +static irqreturn_t fsldma_ctrl_irq(int irq, void *data) +{ + struct fsldma_device *fdev = data; + struct fsldma_chan *chan; + unsigned int handled = 0; + u32 gsr, mask; + int i; + + gsr = (fdev->feature & FSL_DMA_BIG_ENDIAN) ? in_be32(fdev->regs) + : in_le32(fdev->regs); + mask = 0xff000000; + dev_dbg(fdev->dev, "IRQ: gsr 0x%.8x\n", gsr); + + for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { + chan = fdev->chan[i]; + if (!chan) + continue; + + if (gsr & mask) { + dev_dbg(fdev->dev, "IRQ: chan %d\n", chan->id); + fsldma_chan_irq(irq, chan); + handled++; + } + + gsr &= ~mask; + mask >>= 8; + } + + return IRQ_RETVAL(handled); +} + +static void fsldma_free_irqs(struct fsldma_device *fdev) +{ + struct fsldma_chan *chan; + int i; + + if (fdev->irq != NO_IRQ) { + dev_dbg(fdev->dev, "free per-controller IRQ\n"); + free_irq(fdev->irq, fdev); + return; + } + + for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { + chan = fdev->chan[i]; + if (chan && chan->irq != NO_IRQ) { + chan_dbg(chan, "free per-channel IRQ\n"); + free_irq(chan->irq, chan); + } + } +} + +static int fsldma_request_irqs(struct fsldma_device *fdev) +{ + struct fsldma_chan *chan; + int ret; + int i; + + /* if we have a per-controller IRQ, use that */ + if (fdev->irq != NO_IRQ) { + dev_dbg(fdev->dev, "request per-controller IRQ\n"); + ret = request_irq(fdev->irq, fsldma_ctrl_irq, IRQF_SHARED, + "fsldma-controller", fdev); + return ret; + } + + /* no per-controller IRQ, use the per-channel IRQs */ + for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { + chan = fdev->chan[i]; + if (!chan) + continue; + + if (chan->irq == NO_IRQ) { + chan_err(chan, "interrupts property missing in device tree\n"); + ret = -ENODEV; + goto out_unwind; + } + + chan_dbg(chan, "request per-channel IRQ\n"); + ret = request_irq(chan->irq, fsldma_chan_irq, IRQF_SHARED, + "fsldma-chan", chan); + if (ret) { + chan_err(chan, "unable to request per-channel IRQ\n"); + goto out_unwind; + } + } + + return 0; + +out_unwind: + for (/* none */; i >= 0; i--) { + chan = fdev->chan[i]; + if (!chan) + continue; + + if (chan->irq == NO_IRQ) + continue; + + free_irq(chan->irq, chan); + } + + return ret; +} + +/*----------------------------------------------------------------------------*/ +/* OpenFirmware Subsystem */ +/*----------------------------------------------------------------------------*/ + +static int fsl_dma_chan_probe(struct fsldma_device *fdev, + struct device_node *node, u32 feature, const char *compatible) +{ + struct fsldma_chan *chan; + struct resource res; + int err; + + /* alloc channel */ + chan = kzalloc(sizeof(*chan), GFP_KERNEL); + if (!chan) { + dev_err(fdev->dev, "no free memory for DMA channels!\n"); + err = -ENOMEM; + goto out_return; + } + + /* ioremap registers for use */ + chan->regs = of_iomap(node, 0); + if (!chan->regs) { + dev_err(fdev->dev, "unable to ioremap registers\n"); + err = -ENOMEM; + goto out_free_chan; + } + + err = of_address_to_resource(node, 0, &res); + if (err) { + dev_err(fdev->dev, "unable to find 'reg' property\n"); + goto out_iounmap_regs; + } + + chan->feature = feature; + if (!fdev->feature) + fdev->feature = chan->feature; + + /* + * If the DMA device's feature is different than the feature + * of its channels, report the bug + */ + WARN_ON(fdev->feature != chan->feature); + + chan->dev = fdev->dev; + chan->id = (res.start & 0xfff) < 0x300 ? + ((res.start - 0x100) & 0xfff) >> 7 : + ((res.start - 0x200) & 0xfff) >> 7; + if (chan->id >= FSL_DMA_MAX_CHANS_PER_DEVICE) { + dev_err(fdev->dev, "too many channels for device\n"); + err = -EINVAL; + goto out_iounmap_regs; + } + + fdev->chan[chan->id] = chan; + tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan); + snprintf(chan->name, sizeof(chan->name), "chan%d", chan->id); + + /* Initialize the channel */ + dma_init(chan); + + /* Clear cdar registers */ + set_cdar(chan, 0); + + switch (chan->feature & FSL_DMA_IP_MASK) { + case FSL_DMA_IP_85XX: + chan->toggle_ext_pause = fsl_chan_toggle_ext_pause; + case FSL_DMA_IP_83XX: + chan->toggle_ext_start = fsl_chan_toggle_ext_start; + chan->set_src_loop_size = fsl_chan_set_src_loop_size; + chan->set_dst_loop_size = fsl_chan_set_dst_loop_size; + chan->set_request_count = fsl_chan_set_request_count; + } + + spin_lock_init(&chan->desc_lock); + INIT_LIST_HEAD(&chan->ld_pending); + INIT_LIST_HEAD(&chan->ld_running); + INIT_LIST_HEAD(&chan->ld_completed); + chan->idle = true; +#ifdef CONFIG_PM + chan->pm_state = RUNNING; +#endif + + chan->common.device = &fdev->common; + dma_cookie_init(&chan->common); + + /* find the IRQ line, if it exists in the device tree */ + chan->irq = irq_of_parse_and_map(node, 0); + + /* Add the channel to DMA device channel list */ + list_add_tail(&chan->common.device_node, &fdev->common.channels); + + dev_info(fdev->dev, "#%d (%s), irq %d\n", chan->id, compatible, + chan->irq != NO_IRQ ? chan->irq : fdev->irq); + + return 0; + +out_iounmap_regs: + iounmap(chan->regs); +out_free_chan: + kfree(chan); +out_return: + return err; +} + +static void fsl_dma_chan_remove(struct fsldma_chan *chan) +{ + irq_dispose_mapping(chan->irq); + list_del(&chan->common.device_node); + iounmap(chan->regs); + kfree(chan); +} + +static int fsldma_of_probe(struct platform_device *op) +{ + struct fsldma_device *fdev; + struct device_node *child; + int err; + + fdev = kzalloc(sizeof(*fdev), GFP_KERNEL); + if (!fdev) { + dev_err(&op->dev, "No enough memory for 'priv'\n"); + err = -ENOMEM; + goto out_return; + } + + fdev->dev = &op->dev; + INIT_LIST_HEAD(&fdev->common.channels); + + /* ioremap the registers for use */ + fdev->regs = of_iomap(op->dev.of_node, 0); + if (!fdev->regs) { + dev_err(&op->dev, "unable to ioremap registers\n"); + err = -ENOMEM; + goto out_free_fdev; + } + + /* map the channel IRQ if it exists, but don't hookup the handler yet */ + fdev->irq = irq_of_parse_and_map(op->dev.of_node, 0); + + dma_cap_set(DMA_MEMCPY, fdev->common.cap_mask); + dma_cap_set(DMA_SG, fdev->common.cap_mask); + dma_cap_set(DMA_SLAVE, fdev->common.cap_mask); + fdev->common.device_alloc_chan_resources = fsl_dma_alloc_chan_resources; + fdev->common.device_free_chan_resources = fsl_dma_free_chan_resources; + fdev->common.device_prep_dma_memcpy = fsl_dma_prep_memcpy; + fdev->common.device_prep_dma_sg = fsl_dma_prep_sg; + fdev->common.device_tx_status = fsl_tx_status; + fdev->common.device_issue_pending = fsl_dma_memcpy_issue_pending; + fdev->common.device_config = fsl_dma_device_config; + fdev->common.device_terminate_all = fsl_dma_device_terminate_all; + fdev->common.dev = &op->dev; + + fdev->common.src_addr_widths = FSL_DMA_BUSWIDTHS; + fdev->common.dst_addr_widths = FSL_DMA_BUSWIDTHS; + fdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + fdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; + + dma_set_mask(&(op->dev), DMA_BIT_MASK(36)); + + platform_set_drvdata(op, fdev); + + /* + * We cannot use of_platform_bus_probe() because there is no + * of_platform_bus_remove(). Instead, we manually instantiate every DMA + * channel object. + */ + for_each_child_of_node(op->dev.of_node, child) { + if (of_device_is_compatible(child, "fsl,eloplus-dma-channel")) { + fsl_dma_chan_probe(fdev, child, + FSL_DMA_IP_85XX | FSL_DMA_BIG_ENDIAN, + "fsl,eloplus-dma-channel"); + } + + if (of_device_is_compatible(child, "fsl,elo-dma-channel")) { + fsl_dma_chan_probe(fdev, child, + FSL_DMA_IP_83XX | FSL_DMA_LITTLE_ENDIAN, + "fsl,elo-dma-channel"); + } + } + + /* + * Hookup the IRQ handler(s) + * + * If we have a per-controller interrupt, we prefer that to the + * per-channel interrupts to reduce the number of shared interrupt + * handlers on the same IRQ line + */ + err = fsldma_request_irqs(fdev); + if (err) { + dev_err(fdev->dev, "unable to request IRQs\n"); + goto out_free_fdev; + } + + dma_async_device_register(&fdev->common); + return 0; + +out_free_fdev: + irq_dispose_mapping(fdev->irq); + kfree(fdev); +out_return: + return err; +} + +static int fsldma_of_remove(struct platform_device *op) +{ + struct fsldma_device *fdev; + unsigned int i; + + fdev = platform_get_drvdata(op); + dma_async_device_unregister(&fdev->common); + + fsldma_free_irqs(fdev); + + for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { + if (fdev->chan[i]) + fsl_dma_chan_remove(fdev->chan[i]); + } + + iounmap(fdev->regs); + kfree(fdev); + + return 0; +} + +#ifdef CONFIG_PM +static int fsldma_suspend_late(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct fsldma_device *fdev = platform_get_drvdata(pdev); + struct fsldma_chan *chan; + int i; + + for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { + chan = fdev->chan[i]; + if (!chan) + continue; + + spin_lock_bh(&chan->desc_lock); + if (unlikely(!chan->idle)) + goto out; + chan->regs_save.mr = get_mr(chan); + chan->pm_state = SUSPENDED; + spin_unlock_bh(&chan->desc_lock); + } + return 0; + +out: + for (; i >= 0; i--) { + chan = fdev->chan[i]; + if (!chan) + continue; + chan->pm_state = RUNNING; + spin_unlock_bh(&chan->desc_lock); + } + return -EBUSY; +} + +static int fsldma_resume_early(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct fsldma_device *fdev = platform_get_drvdata(pdev); + struct fsldma_chan *chan; + u32 mode; + int i; + + for (i = 0; i < FSL_DMA_MAX_CHANS_PER_DEVICE; i++) { + chan = fdev->chan[i]; + if (!chan) + continue; + + spin_lock_bh(&chan->desc_lock); + mode = chan->regs_save.mr + & ~FSL_DMA_MR_CS & ~FSL_DMA_MR_CC & ~FSL_DMA_MR_CA; + set_mr(chan, mode); + chan->pm_state = RUNNING; + spin_unlock_bh(&chan->desc_lock); + } + + return 0; +} + +static const struct dev_pm_ops fsldma_pm_ops = { + .suspend_late = fsldma_suspend_late, + .resume_early = fsldma_resume_early, +}; +#endif + +static const struct of_device_id fsldma_of_ids[] = { + { .compatible = "fsl,elo3-dma", }, + { .compatible = "fsl,eloplus-dma", }, + { .compatible = "fsl,elo-dma", }, + {} +}; + +static struct platform_driver fsldma_of_driver = { + .driver = { + .name = "fsl-elo-dma", + .of_match_table = fsldma_of_ids, +#ifdef CONFIG_PM + .pm = &fsldma_pm_ops, +#endif + }, + .probe = fsldma_of_probe, + .remove = fsldma_of_remove, +}; + +/*----------------------------------------------------------------------------*/ +/* Module Init / Exit */ +/*----------------------------------------------------------------------------*/ + +static __init int fsldma_init(void) +{ + pr_info("Freescale Elo series DMA driver\n"); + return platform_driver_register(&fsldma_of_driver); +} + +static void __exit fsldma_exit(void) +{ + platform_driver_unregister(&fsldma_of_driver); +} + +subsys_initcall(fsldma_init); +module_exit(fsldma_exit); + +MODULE_DESCRIPTION("Freescale Elo series DMA driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h new file mode 100644 index 000000000..31bffccdc --- /dev/null +++ b/drivers/dma/fsldma.h @@ -0,0 +1,238 @@ +/* + * Copyright (C) 2007-2010 Freescale Semiconductor, Inc. All rights reserved. + * + * Author: + * Zhang Wei <wei.zhang@freescale.com>, Jul 2007 + * Ebony Zhu <ebony.zhu@freescale.com>, May 2007 + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ +#ifndef __DMA_FSLDMA_H +#define __DMA_FSLDMA_H + +#include <linux/device.h> +#include <linux/dmapool.h> +#include <linux/dmaengine.h> + +/* Define data structures needed by Freescale + * MPC8540 and MPC8349 DMA controller. + */ +#define FSL_DMA_MR_CS 0x00000001 +#define FSL_DMA_MR_CC 0x00000002 +#define FSL_DMA_MR_CA 0x00000008 +#define FSL_DMA_MR_EIE 0x00000040 +#define FSL_DMA_MR_XFE 0x00000020 +#define FSL_DMA_MR_EOLNIE 0x00000100 +#define FSL_DMA_MR_EOLSIE 0x00000080 +#define FSL_DMA_MR_EOSIE 0x00000200 +#define FSL_DMA_MR_CDSM 0x00000010 +#define FSL_DMA_MR_CTM 0x00000004 +#define FSL_DMA_MR_EMP_EN 0x00200000 +#define FSL_DMA_MR_EMS_EN 0x00040000 +#define FSL_DMA_MR_DAHE 0x00002000 +#define FSL_DMA_MR_SAHE 0x00001000 + +/* + * Bandwidth/pause control determines how many bytes a given + * channel is allowed to transfer before the DMA engine pauses + * the current channel and switches to the next channel + */ +#define FSL_DMA_MR_BWC 0x0A000000 + +/* Special MR definition for MPC8349 */ +#define FSL_DMA_MR_EOTIE 0x00000080 +#define FSL_DMA_MR_PRC_RM 0x00000800 + +#define FSL_DMA_SR_CH 0x00000020 +#define FSL_DMA_SR_PE 0x00000010 +#define FSL_DMA_SR_CB 0x00000004 +#define FSL_DMA_SR_TE 0x00000080 +#define FSL_DMA_SR_EOSI 0x00000002 +#define FSL_DMA_SR_EOLSI 0x00000001 +#define FSL_DMA_SR_EOCDI 0x00000001 +#define FSL_DMA_SR_EOLNI 0x00000008 + +#define FSL_DMA_SATR_SBPATMU 0x20000000 +#define FSL_DMA_SATR_STRANSINT_RIO 0x00c00000 +#define FSL_DMA_SATR_SREADTYPE_SNOOP_READ 0x00050000 +#define FSL_DMA_SATR_SREADTYPE_BP_IORH 0x00020000 +#define FSL_DMA_SATR_SREADTYPE_BP_NREAD 0x00040000 +#define FSL_DMA_SATR_SREADTYPE_BP_MREAD 0x00070000 + +#define FSL_DMA_DATR_DBPATMU 0x20000000 +#define FSL_DMA_DATR_DTRANSINT_RIO 0x00c00000 +#define FSL_DMA_DATR_DWRITETYPE_SNOOP_WRITE 0x00050000 +#define FSL_DMA_DATR_DWRITETYPE_BP_FLUSH 0x00010000 + +#define FSL_DMA_EOL ((u64)0x1) +#define FSL_DMA_SNEN ((u64)0x10) +#define FSL_DMA_EOSIE 0x8 +#define FSL_DMA_NLDA_MASK (~(u64)0x1f) + +#define FSL_DMA_BCR_MAX_CNT 0x03ffffffu + +#define FSL_DMA_DGSR_TE 0x80 +#define FSL_DMA_DGSR_CH 0x20 +#define FSL_DMA_DGSR_PE 0x10 +#define FSL_DMA_DGSR_EOLNI 0x08 +#define FSL_DMA_DGSR_CB 0x04 +#define FSL_DMA_DGSR_EOSI 0x02 +#define FSL_DMA_DGSR_EOLSI 0x01 + +#define FSL_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) +typedef u64 __bitwise v64; +typedef u32 __bitwise v32; + +struct fsl_dma_ld_hw { + v64 src_addr; + v64 dst_addr; + v64 next_ln_addr; + v32 count; + v32 reserve; +} __attribute__((aligned(32))); + +struct fsl_desc_sw { + struct fsl_dma_ld_hw hw; + struct list_head node; + struct list_head tx_list; + struct dma_async_tx_descriptor async_tx; +} __attribute__((aligned(32))); + +struct fsldma_chan_regs { + u32 mr; /* 0x00 - Mode Register */ + u32 sr; /* 0x04 - Status Register */ + u64 cdar; /* 0x08 - Current descriptor address register */ + u64 sar; /* 0x10 - Source Address Register */ + u64 dar; /* 0x18 - Destination Address Register */ + u32 bcr; /* 0x20 - Byte Count Register */ + u64 ndar; /* 0x24 - Next Descriptor Address Register */ +}; + +struct fsldma_chan; +#define FSL_DMA_MAX_CHANS_PER_DEVICE 8 + +struct fsldma_device { + void __iomem *regs; /* DGSR register base */ + struct device *dev; + struct dma_device common; + struct fsldma_chan *chan[FSL_DMA_MAX_CHANS_PER_DEVICE]; + u32 feature; /* The same as DMA channels */ + int irq; /* Channel IRQ */ +}; + +/* Define macros for fsldma_chan->feature property */ +#define FSL_DMA_LITTLE_ENDIAN 0x00000000 +#define FSL_DMA_BIG_ENDIAN 0x00000001 + +#define FSL_DMA_IP_MASK 0x00000ff0 +#define FSL_DMA_IP_85XX 0x00000010 +#define FSL_DMA_IP_83XX 0x00000020 + +#define FSL_DMA_CHAN_PAUSE_EXT 0x00001000 +#define FSL_DMA_CHAN_START_EXT 0x00002000 + +#ifdef CONFIG_PM +struct fsldma_chan_regs_save { + u32 mr; +}; + +enum fsldma_pm_state { + RUNNING = 0, + SUSPENDED, +}; +#endif + +struct fsldma_chan { + char name[8]; /* Channel name */ + struct fsldma_chan_regs __iomem *regs; + spinlock_t desc_lock; /* Descriptor operation lock */ + /* + * Descriptors which are queued to run, but have not yet been + * submitted to the hardware for execution + */ + struct list_head ld_pending; + /* + * Descriptors which are currently being executed by the hardware + */ + struct list_head ld_running; + /* + * Descriptors which have finished execution by the hardware. These + * descriptors have already had their cleanup actions run. They are + * waiting for the ACK bit to be set by the async_tx API. + */ + struct list_head ld_completed; /* Link descriptors queue */ + struct dma_chan common; /* DMA common channel */ + struct dma_pool *desc_pool; /* Descriptors pool */ + struct device *dev; /* Channel device */ + int irq; /* Channel IRQ */ + int id; /* Raw id of this channel */ + struct tasklet_struct tasklet; + u32 feature; + bool idle; /* DMA controller is idle */ +#ifdef CONFIG_PM + struct fsldma_chan_regs_save regs_save; + enum fsldma_pm_state pm_state; +#endif + + void (*toggle_ext_pause)(struct fsldma_chan *fsl_chan, int enable); + void (*toggle_ext_start)(struct fsldma_chan *fsl_chan, int enable); + void (*set_src_loop_size)(struct fsldma_chan *fsl_chan, int size); + void (*set_dst_loop_size)(struct fsldma_chan *fsl_chan, int size); + void (*set_request_count)(struct fsldma_chan *fsl_chan, int size); +}; + +#define to_fsl_chan(chan) container_of(chan, struct fsldma_chan, common) +#define to_fsl_desc(lh) container_of(lh, struct fsl_desc_sw, node) +#define tx_to_fsl_desc(tx) container_of(tx, struct fsl_desc_sw, async_tx) + +#ifndef __powerpc64__ +static u64 in_be64(const u64 __iomem *addr) +{ + return ((u64)in_be32((u32 __iomem *)addr) << 32) | + (in_be32((u32 __iomem *)addr + 1)); +} + +static void out_be64(u64 __iomem *addr, u64 val) +{ + out_be32((u32 __iomem *)addr, val >> 32); + out_be32((u32 __iomem *)addr + 1, (u32)val); +} + +/* There is no asm instructions for 64 bits reverse loads and stores */ +static u64 in_le64(const u64 __iomem *addr) +{ + return ((u64)in_le32((u32 __iomem *)addr + 1) << 32) | + (in_le32((u32 __iomem *)addr)); +} + +static void out_le64(u64 __iomem *addr, u64 val) +{ + out_le32((u32 __iomem *)addr + 1, val >> 32); + out_le32((u32 __iomem *)addr, (u32)val); +} +#endif + +#define DMA_IN(fsl_chan, addr, width) \ + (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \ + in_be##width(addr) : in_le##width(addr)) +#define DMA_OUT(fsl_chan, addr, val, width) \ + (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \ + out_be##width(addr, val) : out_le##width(addr, val)) + +#define DMA_TO_CPU(fsl_chan, d, width) \ + (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \ + be##width##_to_cpu((__force __be##width)(v##width)d) : \ + le##width##_to_cpu((__force __le##width)(v##width)d)) +#define CPU_TO_DMA(fsl_chan, c, width) \ + (((fsl_chan)->feature & FSL_DMA_BIG_ENDIAN) ? \ + (__force v##width)cpu_to_be##width(c) : \ + (__force v##width)cpu_to_le##width(c)) + +#endif /* __DMA_FSLDMA_H */ diff --git a/drivers/dma/hsu/Kconfig b/drivers/dma/hsu/Kconfig new file mode 100644 index 000000000..2810dca70 --- /dev/null +++ b/drivers/dma/hsu/Kconfig @@ -0,0 +1,14 @@ +# DMA engine configuration for hsu +config HSU_DMA + tristate + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + +config HSU_DMA_PCI + tristate "High Speed UART DMA PCI driver" + depends on PCI + select HSU_DMA + help + Support the High Speed UART DMA on the platfroms that + enumerate it as a PCI device. For example, Intel Medfield + has integrated this HSU DMA controller. diff --git a/drivers/dma/hsu/Makefile b/drivers/dma/hsu/Makefile new file mode 100644 index 000000000..b8f9af032 --- /dev/null +++ b/drivers/dma/hsu/Makefile @@ -0,0 +1,5 @@ +obj-$(CONFIG_HSU_DMA) += hsu_dma.o +hsu_dma-objs := hsu.o + +obj-$(CONFIG_HSU_DMA_PCI) += hsu_dma_pci.o +hsu_dma_pci-objs := pci.o diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c new file mode 100644 index 000000000..f42f71e37 --- /dev/null +++ b/drivers/dma/hsu/hsu.c @@ -0,0 +1,498 @@ +/* + * Core driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> + * + * Partially based on the bits found in drivers/tty/serial/mfd.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * DMA channel allocation: + * 1. Even number chans are used for DMA Read (UART TX), odd chans for DMA + * Write (UART RX). + * 2. 0/1 channel are assigned to port 0, 2/3 chan to port 1, 4/5 chan to + * port 3, and so on. + */ + +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> + +#include "hsu.h" + +#define HSU_DMA_BUSWIDTHS \ + BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_16_BYTES) + +static inline void hsu_chan_disable(struct hsu_dma_chan *hsuc) +{ + hsu_chan_writel(hsuc, HSU_CH_CR, 0); +} + +static inline void hsu_chan_enable(struct hsu_dma_chan *hsuc) +{ + u32 cr = HSU_CH_CR_CHA; + + if (hsuc->direction == DMA_MEM_TO_DEV) + cr &= ~HSU_CH_CR_CHD; + else if (hsuc->direction == DMA_DEV_TO_MEM) + cr |= HSU_CH_CR_CHD; + + hsu_chan_writel(hsuc, HSU_CH_CR, cr); +} + +static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc) +{ + struct dma_slave_config *config = &hsuc->config; + struct hsu_dma_desc *desc = hsuc->desc; + u32 bsr = 0, mtsr = 0; /* to shut the compiler up */ + u32 dcr = HSU_CH_DCR_CHSOE | HSU_CH_DCR_CHEI; + unsigned int i, count; + + if (hsuc->direction == DMA_MEM_TO_DEV) { + bsr = config->dst_maxburst; + mtsr = config->dst_addr_width; + } else if (hsuc->direction == DMA_DEV_TO_MEM) { + bsr = config->src_maxburst; + mtsr = config->src_addr_width; + } + + hsu_chan_disable(hsuc); + + hsu_chan_writel(hsuc, HSU_CH_DCR, 0); + hsu_chan_writel(hsuc, HSU_CH_BSR, bsr); + hsu_chan_writel(hsuc, HSU_CH_MTSR, mtsr); + + /* Set descriptors */ + count = (desc->nents - desc->active) % HSU_DMA_CHAN_NR_DESC; + for (i = 0; i < count; i++) { + hsu_chan_writel(hsuc, HSU_CH_DxSAR(i), desc->sg[i].addr); + hsu_chan_writel(hsuc, HSU_CH_DxTSR(i), desc->sg[i].len); + + /* Prepare value for DCR */ + dcr |= HSU_CH_DCR_DESCA(i); + dcr |= HSU_CH_DCR_CHTOI(i); /* timeout bit, see HSU Errata 1 */ + + desc->active++; + } + /* Only for the last descriptor in the chain */ + dcr |= HSU_CH_DCR_CHSOD(count - 1); + dcr |= HSU_CH_DCR_CHDI(count - 1); + + hsu_chan_writel(hsuc, HSU_CH_DCR, dcr); + + hsu_chan_enable(hsuc); +} + +static void hsu_dma_stop_channel(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_chan_disable(hsuc); + hsu_chan_writel(hsuc, HSU_CH_DCR, 0); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static void hsu_dma_start_channel(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_dma_chan_start(hsuc); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static void hsu_dma_start_transfer(struct hsu_dma_chan *hsuc) +{ + struct virt_dma_desc *vdesc; + + /* Get the next descriptor */ + vdesc = vchan_next_desc(&hsuc->vchan); + if (!vdesc) { + hsuc->desc = NULL; + return; + } + + list_del(&vdesc->node); + hsuc->desc = to_hsu_dma_desc(vdesc); + + /* Start the channel with a new descriptor */ + hsu_dma_start_channel(hsuc); +} + +static u32 hsu_dma_chan_get_sr(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + u32 sr; + + spin_lock_irqsave(&hsuc->lock, flags); + sr = hsu_chan_readl(hsuc, HSU_CH_SR); + spin_unlock_irqrestore(&hsuc->lock, flags); + + return sr; +} + +irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr) +{ + struct hsu_dma_chan *hsuc; + struct hsu_dma_desc *desc; + unsigned long flags; + u32 sr; + + /* Sanity check */ + if (nr >= chip->pdata->nr_channels) + return IRQ_NONE; + + hsuc = &chip->hsu->chan[nr]; + + /* + * No matter what situation, need read clear the IRQ status + * There is a bug, see Errata 5, HSD 2900918 + */ + sr = hsu_dma_chan_get_sr(hsuc); + if (!sr) + return IRQ_NONE; + + /* Timeout IRQ, need wait some time, see Errata 2 */ + if (hsuc->direction == DMA_DEV_TO_MEM && (sr & HSU_CH_SR_DESCTO_ANY)) + udelay(2); + + sr &= ~HSU_CH_SR_DESCTO_ANY; + if (!sr) + return IRQ_HANDLED; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + desc = hsuc->desc; + if (desc) { + if (sr & HSU_CH_SR_CHE) { + desc->status = DMA_ERROR; + } else if (desc->active < desc->nents) { + hsu_dma_start_channel(hsuc); + } else { + vchan_cookie_complete(&desc->vdesc); + desc->status = DMA_COMPLETE; + hsu_dma_start_transfer(hsuc); + } + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return IRQ_HANDLED; +} +EXPORT_SYMBOL_GPL(hsu_dma_irq); + +static struct hsu_dma_desc *hsu_dma_alloc_desc(unsigned int nents) +{ + struct hsu_dma_desc *desc; + + desc = kzalloc(sizeof(*desc), GFP_NOWAIT); + if (!desc) + return NULL; + + desc->sg = kcalloc(nents, sizeof(*desc->sg), GFP_NOWAIT); + if (!desc->sg) { + kfree(desc); + return NULL; + } + + return desc; +} + +static void hsu_dma_desc_free(struct virt_dma_desc *vdesc) +{ + struct hsu_dma_desc *desc = to_hsu_dma_desc(vdesc); + + kfree(desc->sg); + kfree(desc); +} + +static struct dma_async_tx_descriptor *hsu_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + struct hsu_dma_desc *desc; + struct scatterlist *sg; + unsigned int i; + + desc = hsu_dma_alloc_desc(sg_len); + if (!desc) + return NULL; + + for_each_sg(sgl, sg, sg_len, i) { + desc->sg[i].addr = sg_dma_address(sg); + desc->sg[i].len = sg_dma_len(sg); + } + + desc->nents = sg_len; + desc->direction = direction; + /* desc->active = 0 by kzalloc */ + desc->status = DMA_IN_PROGRESS; + + return vchan_tx_prep(&hsuc->vchan, &desc->vdesc, flags); +} + +static void hsu_dma_issue_pending(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + if (vchan_issue_pending(&hsuc->vchan) && !hsuc->desc) + hsu_dma_start_transfer(hsuc); + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); +} + +static size_t hsu_dma_desc_size(struct hsu_dma_desc *desc) +{ + size_t bytes = 0; + unsigned int i; + + for (i = desc->active; i < desc->nents; i++) + bytes += desc->sg[i].len; + + return bytes; +} + +static size_t hsu_dma_active_desc_size(struct hsu_dma_chan *hsuc) +{ + struct hsu_dma_desc *desc = hsuc->desc; + size_t bytes = hsu_dma_desc_size(desc); + int i; + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + i = desc->active % HSU_DMA_CHAN_NR_DESC; + do { + bytes += hsu_chan_readl(hsuc, HSU_CH_DxTSR(i)); + } while (--i >= 0); + spin_unlock_irqrestore(&hsuc->lock, flags); + + return bytes; +} + +static enum dma_status hsu_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + struct virt_dma_desc *vdesc; + enum dma_status status; + size_t bytes; + unsigned long flags; + + status = dma_cookie_status(chan, cookie, state); + if (status == DMA_COMPLETE) + return status; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + vdesc = vchan_find_desc(&hsuc->vchan, cookie); + if (hsuc->desc && cookie == hsuc->desc->vdesc.tx.cookie) { + bytes = hsu_dma_active_desc_size(hsuc); + dma_set_residue(state, bytes); + status = hsuc->desc->status; + } else if (vdesc) { + bytes = hsu_dma_desc_size(to_hsu_dma_desc(vdesc)); + dma_set_residue(state, bytes); + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return status; +} + +static int hsu_dma_slave_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + + /* Check if chan will be configured for slave transfers */ + if (!is_slave_direction(config->direction)) + return -EINVAL; + + memcpy(&hsuc->config, config, sizeof(hsuc->config)); + + return 0; +} + +static void hsu_dma_chan_deactivate(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_chan_disable(hsuc); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static void hsu_dma_chan_activate(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_chan_enable(hsuc); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static int hsu_dma_pause(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + if (hsuc->desc && hsuc->desc->status == DMA_IN_PROGRESS) { + hsu_dma_chan_deactivate(hsuc); + hsuc->desc->status = DMA_PAUSED; + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return 0; +} + +static int hsu_dma_resume(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + if (hsuc->desc && hsuc->desc->status == DMA_PAUSED) { + hsuc->desc->status = DMA_IN_PROGRESS; + hsu_dma_chan_activate(hsuc); + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return 0; +} + +static int hsu_dma_terminate_all(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + + hsu_dma_stop_channel(hsuc); + if (hsuc->desc) { + hsu_dma_desc_free(&hsuc->desc->vdesc); + hsuc->desc = NULL; + } + + vchan_get_all_descriptors(&hsuc->vchan, &head); + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + vchan_dma_desc_free_list(&hsuc->vchan, &head); + + return 0; +} + +static void hsu_dma_free_chan_resources(struct dma_chan *chan) +{ + vchan_free_chan_resources(to_virt_chan(chan)); +} + +int hsu_dma_probe(struct hsu_dma_chip *chip) +{ + struct hsu_dma *hsu; + struct hsu_dma_platform_data *pdata = chip->pdata; + void __iomem *addr = chip->regs + chip->offset; + unsigned short i; + int ret; + + hsu = devm_kzalloc(chip->dev, sizeof(*hsu), GFP_KERNEL); + if (!hsu) + return -ENOMEM; + + chip->hsu = hsu; + + if (!pdata) { + pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + chip->pdata = pdata; + + /* Guess nr_channels from the IO space length */ + pdata->nr_channels = (chip->length - chip->offset) / + HSU_DMA_CHAN_LENGTH; + } + + hsu->chan = devm_kcalloc(chip->dev, pdata->nr_channels, + sizeof(*hsu->chan), GFP_KERNEL); + if (!hsu->chan) + return -ENOMEM; + + INIT_LIST_HEAD(&hsu->dma.channels); + for (i = 0; i < pdata->nr_channels; i++) { + struct hsu_dma_chan *hsuc = &hsu->chan[i]; + + hsuc->vchan.desc_free = hsu_dma_desc_free; + vchan_init(&hsuc->vchan, &hsu->dma); + + hsuc->direction = (i & 0x1) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; + hsuc->reg = addr + i * HSU_DMA_CHAN_LENGTH; + + spin_lock_init(&hsuc->lock); + } + + dma_cap_set(DMA_SLAVE, hsu->dma.cap_mask); + dma_cap_set(DMA_PRIVATE, hsu->dma.cap_mask); + + hsu->dma.device_free_chan_resources = hsu_dma_free_chan_resources; + + hsu->dma.device_prep_slave_sg = hsu_dma_prep_slave_sg; + + hsu->dma.device_issue_pending = hsu_dma_issue_pending; + hsu->dma.device_tx_status = hsu_dma_tx_status; + + hsu->dma.device_config = hsu_dma_slave_config; + hsu->dma.device_pause = hsu_dma_pause; + hsu->dma.device_resume = hsu_dma_resume; + hsu->dma.device_terminate_all = hsu_dma_terminate_all; + + hsu->dma.src_addr_widths = HSU_DMA_BUSWIDTHS; + hsu->dma.dst_addr_widths = HSU_DMA_BUSWIDTHS; + hsu->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + hsu->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + hsu->dma.dev = chip->dev; + + ret = dma_async_device_register(&hsu->dma); + if (ret) + return ret; + + dev_info(chip->dev, "Found HSU DMA, %d channels\n", pdata->nr_channels); + return 0; +} +EXPORT_SYMBOL_GPL(hsu_dma_probe); + +int hsu_dma_remove(struct hsu_dma_chip *chip) +{ + struct hsu_dma *hsu = chip->hsu; + unsigned short i; + + dma_async_device_unregister(&hsu->dma); + + for (i = 0; i < chip->pdata->nr_channels; i++) { + struct hsu_dma_chan *hsuc = &hsu->chan[i]; + + tasklet_kill(&hsuc->vchan.task); + } + + return 0; +} +EXPORT_SYMBOL_GPL(hsu_dma_remove); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("High Speed UART DMA core driver"); +MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); diff --git a/drivers/dma/hsu/hsu.h b/drivers/dma/hsu/hsu.h new file mode 100644 index 000000000..0275233cf --- /dev/null +++ b/drivers/dma/hsu/hsu.h @@ -0,0 +1,118 @@ +/* + * Driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * + * Partially based on the bits found in drivers/tty/serial/mfd.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __DMA_HSU_H__ +#define __DMA_HSU_H__ + +#include <linux/spinlock.h> +#include <linux/dma/hsu.h> + +#include "../virt-dma.h" + +#define HSU_CH_SR 0x00 /* channel status */ +#define HSU_CH_CR 0x04 /* channel control */ +#define HSU_CH_DCR 0x08 /* descriptor control */ +#define HSU_CH_BSR 0x10 /* FIFO buffer size */ +#define HSU_CH_MTSR 0x14 /* minimum transfer size */ +#define HSU_CH_DxSAR(x) (0x20 + 8 * (x)) /* desc start addr */ +#define HSU_CH_DxTSR(x) (0x24 + 8 * (x)) /* desc transfer size */ +#define HSU_CH_D0SAR 0x20 /* desc 0 start addr */ +#define HSU_CH_D0TSR 0x24 /* desc 0 transfer size */ +#define HSU_CH_D1SAR 0x28 +#define HSU_CH_D1TSR 0x2c +#define HSU_CH_D2SAR 0x30 +#define HSU_CH_D2TSR 0x34 +#define HSU_CH_D3SAR 0x38 +#define HSU_CH_D3TSR 0x3c + +#define HSU_DMA_CHAN_NR_DESC 4 +#define HSU_DMA_CHAN_LENGTH 0x40 + +/* Bits in HSU_CH_SR */ +#define HSU_CH_SR_DESCTO(x) BIT(8 + (x)) +#define HSU_CH_SR_DESCTO_ANY (BIT(11) | BIT(10) | BIT(9) | BIT(8)) +#define HSU_CH_SR_CHE BIT(15) + +/* Bits in HSU_CH_CR */ +#define HSU_CH_CR_CHA BIT(0) +#define HSU_CH_CR_CHD BIT(1) + +/* Bits in HSU_CH_DCR */ +#define HSU_CH_DCR_DESCA(x) BIT(0 + (x)) +#define HSU_CH_DCR_CHSOD(x) BIT(8 + (x)) +#define HSU_CH_DCR_CHSOTO BIT(14) +#define HSU_CH_DCR_CHSOE BIT(15) +#define HSU_CH_DCR_CHDI(x) BIT(16 + (x)) +#define HSU_CH_DCR_CHEI BIT(23) +#define HSU_CH_DCR_CHTOI(x) BIT(24 + (x)) + +struct hsu_dma_sg { + dma_addr_t addr; + unsigned int len; +}; + +struct hsu_dma_desc { + struct virt_dma_desc vdesc; + enum dma_transfer_direction direction; + struct hsu_dma_sg *sg; + unsigned int nents; + unsigned int active; + enum dma_status status; +}; + +static inline struct hsu_dma_desc *to_hsu_dma_desc(struct virt_dma_desc *vdesc) +{ + return container_of(vdesc, struct hsu_dma_desc, vdesc); +} + +struct hsu_dma_chan { + struct virt_dma_chan vchan; + + void __iomem *reg; + spinlock_t lock; + + /* hardware configuration */ + enum dma_transfer_direction direction; + struct dma_slave_config config; + + struct hsu_dma_desc *desc; +}; + +static inline struct hsu_dma_chan *to_hsu_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct hsu_dma_chan, vchan.chan); +} + +static inline u32 hsu_chan_readl(struct hsu_dma_chan *hsuc, int offset) +{ + return readl(hsuc->reg + offset); +} + +static inline void hsu_chan_writel(struct hsu_dma_chan *hsuc, int offset, + u32 value) +{ + writel(value, hsuc->reg + offset); +} + +struct hsu_dma { + struct dma_device dma; + + /* channels */ + struct hsu_dma_chan *chan; +}; + +static inline struct hsu_dma *to_hsu_dma(struct dma_device *ddev) +{ + return container_of(ddev, struct hsu_dma, dma); +} + +#endif /* __DMA_HSU_H__ */ diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c new file mode 100644 index 000000000..77879e6dd --- /dev/null +++ b/drivers/dma/hsu/pci.c @@ -0,0 +1,124 @@ +/* + * PCI driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com> + * + * Partially based on the bits found in drivers/tty/serial/mfd.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/bitops.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/pci.h> + +#include "hsu.h" + +#define HSU_PCI_DMASR 0x00 +#define HSU_PCI_DMAISR 0x04 + +#define HSU_PCI_CHAN_OFFSET 0x100 + +static irqreturn_t hsu_pci_irq(int irq, void *dev) +{ + struct hsu_dma_chip *chip = dev; + u32 dmaisr; + unsigned short i; + irqreturn_t ret = IRQ_NONE; + + dmaisr = readl(chip->regs + HSU_PCI_DMAISR); + for (i = 0; i < chip->pdata->nr_channels; i++) { + if (dmaisr & 0x1) + ret |= hsu_dma_irq(chip, i); + dmaisr >>= 1; + } + + return ret; +} + +static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct hsu_dma_chip *chip; + int ret; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev)); + if (ret) { + dev_err(&pdev->dev, "I/O memory remapping failed\n"); + return ret; + } + + pci_set_master(pdev); + pci_try_set_mwi(pdev); + + ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = &pdev->dev; + chip->regs = pcim_iomap_table(pdev)[0]; + chip->length = pci_resource_len(pdev, 0); + chip->offset = HSU_PCI_CHAN_OFFSET; + chip->irq = pdev->irq; + + pci_enable_msi(pdev); + + ret = hsu_dma_probe(chip); + if (ret) + return ret; + + ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip); + if (ret) + goto err_register_irq; + + pci_set_drvdata(pdev, chip); + + return 0; + +err_register_irq: + hsu_dma_remove(chip); + return ret; +} + +static void hsu_pci_remove(struct pci_dev *pdev) +{ + struct hsu_dma_chip *chip = pci_get_drvdata(pdev); + + free_irq(chip->irq, chip); + hsu_dma_remove(chip); +} + +static const struct pci_device_id hsu_pci_id_table[] = { + { PCI_VDEVICE(INTEL, 0x081e), 0 }, + { PCI_VDEVICE(INTEL, 0x1192), 0 }, + { } +}; +MODULE_DEVICE_TABLE(pci, hsu_pci_id_table); + +static struct pci_driver hsu_pci_driver = { + .name = "hsu_dma_pci", + .id_table = hsu_pci_id_table, + .probe = hsu_pci_probe, + .remove = hsu_pci_remove, +}; + +module_pci_driver(hsu_pci_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("High Speed UART DMA PCI driver"); +MODULE_AUTHOR("Andy Shevchenko <andriy.shevchenko@linux.intel.com>"); diff --git a/drivers/dma/img-mdc-dma.c b/drivers/dma/img-mdc-dma.c new file mode 100644 index 000000000..9ca56830c --- /dev/null +++ b/drivers/dma/img-mdc-dma.c @@ -0,0 +1,1005 @@ +/* + * IMG Multi-threaded DMA Controller (MDC) + * + * Copyright (C) 2009,2012,2013 Imagination Technologies Ltd. + * Copyright (C) 2014 Google, Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/mfd/syscon.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "dmaengine.h" +#include "virt-dma.h" + +#define MDC_MAX_DMA_CHANNELS 32 + +#define MDC_GENERAL_CONFIG 0x000 +#define MDC_GENERAL_CONFIG_LIST_IEN BIT(31) +#define MDC_GENERAL_CONFIG_IEN BIT(29) +#define MDC_GENERAL_CONFIG_LEVEL_INT BIT(28) +#define MDC_GENERAL_CONFIG_INC_W BIT(12) +#define MDC_GENERAL_CONFIG_INC_R BIT(8) +#define MDC_GENERAL_CONFIG_PHYSICAL_W BIT(7) +#define MDC_GENERAL_CONFIG_WIDTH_W_SHIFT 4 +#define MDC_GENERAL_CONFIG_WIDTH_W_MASK 0x7 +#define MDC_GENERAL_CONFIG_PHYSICAL_R BIT(3) +#define MDC_GENERAL_CONFIG_WIDTH_R_SHIFT 0 +#define MDC_GENERAL_CONFIG_WIDTH_R_MASK 0x7 + +#define MDC_READ_PORT_CONFIG 0x004 +#define MDC_READ_PORT_CONFIG_STHREAD_SHIFT 28 +#define MDC_READ_PORT_CONFIG_STHREAD_MASK 0xf +#define MDC_READ_PORT_CONFIG_RTHREAD_SHIFT 24 +#define MDC_READ_PORT_CONFIG_RTHREAD_MASK 0xf +#define MDC_READ_PORT_CONFIG_WTHREAD_SHIFT 16 +#define MDC_READ_PORT_CONFIG_WTHREAD_MASK 0xf +#define MDC_READ_PORT_CONFIG_BURST_SIZE_SHIFT 4 +#define MDC_READ_PORT_CONFIG_BURST_SIZE_MASK 0xff +#define MDC_READ_PORT_CONFIG_DREQ_ENABLE BIT(1) + +#define MDC_READ_ADDRESS 0x008 + +#define MDC_WRITE_ADDRESS 0x00c + +#define MDC_TRANSFER_SIZE 0x010 +#define MDC_TRANSFER_SIZE_MASK 0xffffff + +#define MDC_LIST_NODE_ADDRESS 0x014 + +#define MDC_CMDS_PROCESSED 0x018 +#define MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT 16 +#define MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK 0x3f +#define MDC_CMDS_PROCESSED_INT_ACTIVE BIT(8) +#define MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT 0 +#define MDC_CMDS_PROCESSED_CMDS_DONE_MASK 0x3f + +#define MDC_CONTROL_AND_STATUS 0x01c +#define MDC_CONTROL_AND_STATUS_CANCEL BIT(20) +#define MDC_CONTROL_AND_STATUS_LIST_EN BIT(4) +#define MDC_CONTROL_AND_STATUS_EN BIT(0) + +#define MDC_ACTIVE_TRANSFER_SIZE 0x030 + +#define MDC_GLOBAL_CONFIG_A 0x900 +#define MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_SHIFT 16 +#define MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_MASK 0xff +#define MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_SHIFT 8 +#define MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_MASK 0xff +#define MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_SHIFT 0 +#define MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_MASK 0xff + +struct mdc_hw_list_desc { + u32 gen_conf; + u32 readport_conf; + u32 read_addr; + u32 write_addr; + u32 xfer_size; + u32 node_addr; + u32 cmds_done; + u32 ctrl_status; + /* + * Not part of the list descriptor, but instead used by the CPU to + * traverse the list. + */ + struct mdc_hw_list_desc *next_desc; +}; + +struct mdc_tx_desc { + struct mdc_chan *chan; + struct virt_dma_desc vd; + dma_addr_t list_phys; + struct mdc_hw_list_desc *list; + bool cyclic; + bool cmd_loaded; + unsigned int list_len; + unsigned int list_period_len; + size_t list_xfer_size; + unsigned int list_cmds_done; +}; + +struct mdc_chan { + struct mdc_dma *mdma; + struct virt_dma_chan vc; + struct dma_slave_config config; + struct mdc_tx_desc *desc; + int irq; + unsigned int periph; + unsigned int thread; + unsigned int chan_nr; +}; + +struct mdc_dma_soc_data { + void (*enable_chan)(struct mdc_chan *mchan); + void (*disable_chan)(struct mdc_chan *mchan); +}; + +struct mdc_dma { + struct dma_device dma_dev; + void __iomem *regs; + struct clk *clk; + struct dma_pool *desc_pool; + struct regmap *periph_regs; + spinlock_t lock; + unsigned int nr_threads; + unsigned int nr_channels; + unsigned int bus_width; + unsigned int max_burst_mult; + unsigned int max_xfer_size; + const struct mdc_dma_soc_data *soc; + struct mdc_chan channels[MDC_MAX_DMA_CHANNELS]; +}; + +static inline u32 mdc_readl(struct mdc_dma *mdma, u32 reg) +{ + return readl(mdma->regs + reg); +} + +static inline void mdc_writel(struct mdc_dma *mdma, u32 val, u32 reg) +{ + writel(val, mdma->regs + reg); +} + +static inline u32 mdc_chan_readl(struct mdc_chan *mchan, u32 reg) +{ + return mdc_readl(mchan->mdma, mchan->chan_nr * 0x040 + reg); +} + +static inline void mdc_chan_writel(struct mdc_chan *mchan, u32 val, u32 reg) +{ + mdc_writel(mchan->mdma, val, mchan->chan_nr * 0x040 + reg); +} + +static inline struct mdc_chan *to_mdc_chan(struct dma_chan *c) +{ + return container_of(to_virt_chan(c), struct mdc_chan, vc); +} + +static inline struct mdc_tx_desc *to_mdc_desc(struct dma_async_tx_descriptor *t) +{ + struct virt_dma_desc *vdesc = container_of(t, struct virt_dma_desc, tx); + + return container_of(vdesc, struct mdc_tx_desc, vd); +} + +static inline struct device *mdma2dev(struct mdc_dma *mdma) +{ + return mdma->dma_dev.dev; +} + +static inline unsigned int to_mdc_width(unsigned int bytes) +{ + return ffs(bytes) - 1; +} + +static inline void mdc_set_read_width(struct mdc_hw_list_desc *ldesc, + unsigned int bytes) +{ + ldesc->gen_conf |= to_mdc_width(bytes) << + MDC_GENERAL_CONFIG_WIDTH_R_SHIFT; +} + +static inline void mdc_set_write_width(struct mdc_hw_list_desc *ldesc, + unsigned int bytes) +{ + ldesc->gen_conf |= to_mdc_width(bytes) << + MDC_GENERAL_CONFIG_WIDTH_W_SHIFT; +} + +static void mdc_list_desc_config(struct mdc_chan *mchan, + struct mdc_hw_list_desc *ldesc, + enum dma_transfer_direction dir, + dma_addr_t src, dma_addr_t dst, size_t len) +{ + struct mdc_dma *mdma = mchan->mdma; + unsigned int max_burst, burst_size; + + ldesc->gen_conf = MDC_GENERAL_CONFIG_IEN | MDC_GENERAL_CONFIG_LIST_IEN | + MDC_GENERAL_CONFIG_LEVEL_INT | MDC_GENERAL_CONFIG_PHYSICAL_W | + MDC_GENERAL_CONFIG_PHYSICAL_R; + ldesc->readport_conf = + (mchan->thread << MDC_READ_PORT_CONFIG_STHREAD_SHIFT) | + (mchan->thread << MDC_READ_PORT_CONFIG_RTHREAD_SHIFT) | + (mchan->thread << MDC_READ_PORT_CONFIG_WTHREAD_SHIFT); + ldesc->read_addr = src; + ldesc->write_addr = dst; + ldesc->xfer_size = len - 1; + ldesc->node_addr = 0; + ldesc->cmds_done = 0; + ldesc->ctrl_status = MDC_CONTROL_AND_STATUS_LIST_EN | + MDC_CONTROL_AND_STATUS_EN; + ldesc->next_desc = NULL; + + if (IS_ALIGNED(dst, mdma->bus_width) && + IS_ALIGNED(src, mdma->bus_width)) + max_burst = mdma->bus_width * mdma->max_burst_mult; + else + max_burst = mdma->bus_width * (mdma->max_burst_mult - 1); + + if (dir == DMA_MEM_TO_DEV) { + ldesc->gen_conf |= MDC_GENERAL_CONFIG_INC_R; + ldesc->readport_conf |= MDC_READ_PORT_CONFIG_DREQ_ENABLE; + mdc_set_read_width(ldesc, mdma->bus_width); + mdc_set_write_width(ldesc, mchan->config.dst_addr_width); + burst_size = min(max_burst, mchan->config.dst_maxburst * + mchan->config.dst_addr_width); + } else if (dir == DMA_DEV_TO_MEM) { + ldesc->gen_conf |= MDC_GENERAL_CONFIG_INC_W; + ldesc->readport_conf |= MDC_READ_PORT_CONFIG_DREQ_ENABLE; + mdc_set_read_width(ldesc, mchan->config.src_addr_width); + mdc_set_write_width(ldesc, mdma->bus_width); + burst_size = min(max_burst, mchan->config.src_maxburst * + mchan->config.src_addr_width); + } else { + ldesc->gen_conf |= MDC_GENERAL_CONFIG_INC_R | + MDC_GENERAL_CONFIG_INC_W; + mdc_set_read_width(ldesc, mdma->bus_width); + mdc_set_write_width(ldesc, mdma->bus_width); + burst_size = max_burst; + } + ldesc->readport_conf |= (burst_size - 1) << + MDC_READ_PORT_CONFIG_BURST_SIZE_SHIFT; +} + +static void mdc_list_desc_free(struct mdc_tx_desc *mdesc) +{ + struct mdc_dma *mdma = mdesc->chan->mdma; + struct mdc_hw_list_desc *curr, *next; + dma_addr_t curr_phys, next_phys; + + curr = mdesc->list; + curr_phys = mdesc->list_phys; + while (curr) { + next = curr->next_desc; + next_phys = curr->node_addr; + dma_pool_free(mdma->desc_pool, curr, curr_phys); + curr = next; + curr_phys = next_phys; + } +} + +static void mdc_desc_free(struct virt_dma_desc *vd) +{ + struct mdc_tx_desc *mdesc = to_mdc_desc(&vd->tx); + + mdc_list_desc_free(mdesc); + kfree(mdesc); +} + +static struct dma_async_tx_descriptor *mdc_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, size_t len, + unsigned long flags) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + struct mdc_dma *mdma = mchan->mdma; + struct mdc_tx_desc *mdesc; + struct mdc_hw_list_desc *curr, *prev = NULL; + dma_addr_t curr_phys, prev_phys; + + if (!len) + return NULL; + + mdesc = kzalloc(sizeof(*mdesc), GFP_NOWAIT); + if (!mdesc) + return NULL; + mdesc->chan = mchan; + mdesc->list_xfer_size = len; + + while (len > 0) { + size_t xfer_size; + + curr = dma_pool_alloc(mdma->desc_pool, GFP_NOWAIT, &curr_phys); + if (!curr) + goto free_desc; + + if (prev) { + prev->node_addr = curr_phys; + prev->next_desc = curr; + } else { + mdesc->list_phys = curr_phys; + mdesc->list = curr; + } + + xfer_size = min_t(size_t, mdma->max_xfer_size, len); + + mdc_list_desc_config(mchan, curr, DMA_MEM_TO_MEM, src, dest, + xfer_size); + + prev = curr; + prev_phys = curr_phys; + + mdesc->list_len++; + src += xfer_size; + dest += xfer_size; + len -= xfer_size; + } + + return vchan_tx_prep(&mchan->vc, &mdesc->vd, flags); + +free_desc: + mdc_desc_free(&mdesc->vd); + + return NULL; +} + +static int mdc_check_slave_width(struct mdc_chan *mchan, + enum dma_transfer_direction dir) +{ + enum dma_slave_buswidth width; + + if (dir == DMA_MEM_TO_DEV) + width = mchan->config.dst_addr_width; + else + width = mchan->config.src_addr_width; + + switch (width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + case DMA_SLAVE_BUSWIDTH_2_BYTES: + case DMA_SLAVE_BUSWIDTH_4_BYTES: + case DMA_SLAVE_BUSWIDTH_8_BYTES: + break; + default: + return -EINVAL; + } + + if (width > mchan->mdma->bus_width) + return -EINVAL; + + return 0; +} + +static struct dma_async_tx_descriptor *mdc_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction dir, + unsigned long flags) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + struct mdc_dma *mdma = mchan->mdma; + struct mdc_tx_desc *mdesc; + struct mdc_hw_list_desc *curr, *prev = NULL; + dma_addr_t curr_phys, prev_phys; + + if (!buf_len && !period_len) + return NULL; + + if (!is_slave_direction(dir)) + return NULL; + + if (mdc_check_slave_width(mchan, dir) < 0) + return NULL; + + mdesc = kzalloc(sizeof(*mdesc), GFP_NOWAIT); + if (!mdesc) + return NULL; + mdesc->chan = mchan; + mdesc->cyclic = true; + mdesc->list_xfer_size = buf_len; + mdesc->list_period_len = DIV_ROUND_UP(period_len, + mdma->max_xfer_size); + + while (buf_len > 0) { + size_t remainder = min(period_len, buf_len); + + while (remainder > 0) { + size_t xfer_size; + + curr = dma_pool_alloc(mdma->desc_pool, GFP_NOWAIT, + &curr_phys); + if (!curr) + goto free_desc; + + if (!prev) { + mdesc->list_phys = curr_phys; + mdesc->list = curr; + } else { + prev->node_addr = curr_phys; + prev->next_desc = curr; + } + + xfer_size = min_t(size_t, mdma->max_xfer_size, + remainder); + + if (dir == DMA_MEM_TO_DEV) { + mdc_list_desc_config(mchan, curr, dir, + buf_addr, + mchan->config.dst_addr, + xfer_size); + } else { + mdc_list_desc_config(mchan, curr, dir, + mchan->config.src_addr, + buf_addr, + xfer_size); + } + + prev = curr; + prev_phys = curr_phys; + + mdesc->list_len++; + buf_addr += xfer_size; + buf_len -= xfer_size; + remainder -= xfer_size; + } + } + prev->node_addr = mdesc->list_phys; + + return vchan_tx_prep(&mchan->vc, &mdesc->vd, flags); + +free_desc: + mdc_desc_free(&mdesc->vd); + + return NULL; +} + +static struct dma_async_tx_descriptor *mdc_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction dir, + unsigned long flags, void *context) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + struct mdc_dma *mdma = mchan->mdma; + struct mdc_tx_desc *mdesc; + struct scatterlist *sg; + struct mdc_hw_list_desc *curr, *prev = NULL; + dma_addr_t curr_phys, prev_phys; + unsigned int i; + + if (!sgl) + return NULL; + + if (!is_slave_direction(dir)) + return NULL; + + if (mdc_check_slave_width(mchan, dir) < 0) + return NULL; + + mdesc = kzalloc(sizeof(*mdesc), GFP_NOWAIT); + if (!mdesc) + return NULL; + mdesc->chan = mchan; + + for_each_sg(sgl, sg, sg_len, i) { + dma_addr_t buf = sg_dma_address(sg); + size_t buf_len = sg_dma_len(sg); + + while (buf_len > 0) { + size_t xfer_size; + + curr = dma_pool_alloc(mdma->desc_pool, GFP_NOWAIT, + &curr_phys); + if (!curr) + goto free_desc; + + if (!prev) { + mdesc->list_phys = curr_phys; + mdesc->list = curr; + } else { + prev->node_addr = curr_phys; + prev->next_desc = curr; + } + + xfer_size = min_t(size_t, mdma->max_xfer_size, + buf_len); + + if (dir == DMA_MEM_TO_DEV) { + mdc_list_desc_config(mchan, curr, dir, buf, + mchan->config.dst_addr, + xfer_size); + } else { + mdc_list_desc_config(mchan, curr, dir, + mchan->config.src_addr, + buf, xfer_size); + } + + prev = curr; + prev_phys = curr_phys; + + mdesc->list_len++; + mdesc->list_xfer_size += xfer_size; + buf += xfer_size; + buf_len -= xfer_size; + } + } + + return vchan_tx_prep(&mchan->vc, &mdesc->vd, flags); + +free_desc: + mdc_desc_free(&mdesc->vd); + + return NULL; +} + +static void mdc_issue_desc(struct mdc_chan *mchan) +{ + struct mdc_dma *mdma = mchan->mdma; + struct virt_dma_desc *vd; + struct mdc_tx_desc *mdesc; + u32 val; + + vd = vchan_next_desc(&mchan->vc); + if (!vd) + return; + + list_del(&vd->node); + + mdesc = to_mdc_desc(&vd->tx); + mchan->desc = mdesc; + + dev_dbg(mdma2dev(mdma), "Issuing descriptor on channel %d\n", + mchan->chan_nr); + + mdma->soc->enable_chan(mchan); + + val = mdc_chan_readl(mchan, MDC_GENERAL_CONFIG); + val |= MDC_GENERAL_CONFIG_LIST_IEN | MDC_GENERAL_CONFIG_IEN | + MDC_GENERAL_CONFIG_LEVEL_INT | MDC_GENERAL_CONFIG_PHYSICAL_W | + MDC_GENERAL_CONFIG_PHYSICAL_R; + mdc_chan_writel(mchan, val, MDC_GENERAL_CONFIG); + val = (mchan->thread << MDC_READ_PORT_CONFIG_STHREAD_SHIFT) | + (mchan->thread << MDC_READ_PORT_CONFIG_RTHREAD_SHIFT) | + (mchan->thread << MDC_READ_PORT_CONFIG_WTHREAD_SHIFT); + mdc_chan_writel(mchan, val, MDC_READ_PORT_CONFIG); + mdc_chan_writel(mchan, mdesc->list_phys, MDC_LIST_NODE_ADDRESS); + val = mdc_chan_readl(mchan, MDC_CONTROL_AND_STATUS); + val |= MDC_CONTROL_AND_STATUS_LIST_EN; + mdc_chan_writel(mchan, val, MDC_CONTROL_AND_STATUS); +} + +static void mdc_issue_pending(struct dma_chan *chan) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&mchan->vc.lock, flags); + if (vchan_issue_pending(&mchan->vc) && !mchan->desc) + mdc_issue_desc(mchan); + spin_unlock_irqrestore(&mchan->vc.lock, flags); +} + +static enum dma_status mdc_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + struct mdc_tx_desc *mdesc; + struct virt_dma_desc *vd; + unsigned long flags; + size_t bytes = 0; + int ret; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + if (!txstate) + return ret; + + spin_lock_irqsave(&mchan->vc.lock, flags); + vd = vchan_find_desc(&mchan->vc, cookie); + if (vd) { + mdesc = to_mdc_desc(&vd->tx); + bytes = mdesc->list_xfer_size; + } else if (mchan->desc && mchan->desc->vd.tx.cookie == cookie) { + struct mdc_hw_list_desc *ldesc; + u32 val1, val2, done, processed, residue; + int i, cmds; + + mdesc = mchan->desc; + + /* + * Determine the number of commands that haven't been + * processed (handled by the IRQ handler) yet. + */ + do { + val1 = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED) & + ~MDC_CMDS_PROCESSED_INT_ACTIVE; + residue = mdc_chan_readl(mchan, + MDC_ACTIVE_TRANSFER_SIZE); + val2 = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED) & + ~MDC_CMDS_PROCESSED_INT_ACTIVE; + } while (val1 != val2); + + done = (val1 >> MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT) & + MDC_CMDS_PROCESSED_CMDS_DONE_MASK; + processed = (val1 >> MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT) & + MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK; + cmds = (done - processed) % + (MDC_CMDS_PROCESSED_CMDS_DONE_MASK + 1); + + /* + * If the command loaded event hasn't been processed yet, then + * the difference above includes an extra command. + */ + if (!mdesc->cmd_loaded) + cmds--; + else + cmds += mdesc->list_cmds_done; + + bytes = mdesc->list_xfer_size; + ldesc = mdesc->list; + for (i = 0; i < cmds; i++) { + bytes -= ldesc->xfer_size + 1; + ldesc = ldesc->next_desc; + } + if (ldesc) { + if (residue != MDC_TRANSFER_SIZE_MASK) + bytes -= ldesc->xfer_size - residue; + else + bytes -= ldesc->xfer_size + 1; + } + } + spin_unlock_irqrestore(&mchan->vc.lock, flags); + + dma_set_residue(txstate, bytes); + + return ret; +} + +static int mdc_terminate_all(struct dma_chan *chan) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + struct mdc_tx_desc *mdesc; + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&mchan->vc.lock, flags); + + mdc_chan_writel(mchan, MDC_CONTROL_AND_STATUS_CANCEL, + MDC_CONTROL_AND_STATUS); + + mdesc = mchan->desc; + mchan->desc = NULL; + vchan_get_all_descriptors(&mchan->vc, &head); + + spin_unlock_irqrestore(&mchan->vc.lock, flags); + + if (mdesc) + mdc_desc_free(&mdesc->vd); + vchan_dma_desc_free_list(&mchan->vc, &head); + + return 0; +} + +static int mdc_slave_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&mchan->vc.lock, flags); + mchan->config = *config; + spin_unlock_irqrestore(&mchan->vc.lock, flags); + + return 0; +} + +static void mdc_free_chan_resources(struct dma_chan *chan) +{ + struct mdc_chan *mchan = to_mdc_chan(chan); + struct mdc_dma *mdma = mchan->mdma; + + mdc_terminate_all(chan); + + mdma->soc->disable_chan(mchan); +} + +static irqreturn_t mdc_chan_irq(int irq, void *dev_id) +{ + struct mdc_chan *mchan = (struct mdc_chan *)dev_id; + struct mdc_tx_desc *mdesc; + u32 val, processed, done1, done2; + unsigned int i; + + spin_lock(&mchan->vc.lock); + + val = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED); + processed = (val >> MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT) & + MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK; + /* + * CMDS_DONE may have incremented between reading CMDS_PROCESSED + * and clearing INT_ACTIVE. Re-read CMDS_PROCESSED to ensure we + * didn't miss a command completion. + */ + do { + val = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED); + done1 = (val >> MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT) & + MDC_CMDS_PROCESSED_CMDS_DONE_MASK; + val &= ~((MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK << + MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT) | + MDC_CMDS_PROCESSED_INT_ACTIVE); + val |= done1 << MDC_CMDS_PROCESSED_CMDS_PROCESSED_SHIFT; + mdc_chan_writel(mchan, val, MDC_CMDS_PROCESSED); + val = mdc_chan_readl(mchan, MDC_CMDS_PROCESSED); + done2 = (val >> MDC_CMDS_PROCESSED_CMDS_DONE_SHIFT) & + MDC_CMDS_PROCESSED_CMDS_DONE_MASK; + } while (done1 != done2); + + dev_dbg(mdma2dev(mchan->mdma), "IRQ on channel %d\n", mchan->chan_nr); + + mdesc = mchan->desc; + if (!mdesc) { + dev_warn(mdma2dev(mchan->mdma), + "IRQ with no active descriptor on channel %d\n", + mchan->chan_nr); + goto out; + } + + for (i = processed; i != done1; + i = (i + 1) % (MDC_CMDS_PROCESSED_CMDS_PROCESSED_MASK + 1)) { + /* + * The first interrupt in a transfer indicates that the + * command list has been loaded, not that a command has + * been completed. + */ + if (!mdesc->cmd_loaded) { + mdesc->cmd_loaded = true; + continue; + } + + mdesc->list_cmds_done++; + if (mdesc->cyclic) { + mdesc->list_cmds_done %= mdesc->list_len; + if (mdesc->list_cmds_done % mdesc->list_period_len == 0) + vchan_cyclic_callback(&mdesc->vd); + } else if (mdesc->list_cmds_done == mdesc->list_len) { + mchan->desc = NULL; + vchan_cookie_complete(&mdesc->vd); + mdc_issue_desc(mchan); + break; + } + } +out: + spin_unlock(&mchan->vc.lock); + + return IRQ_HANDLED; +} + +static struct dma_chan *mdc_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct mdc_dma *mdma = ofdma->of_dma_data; + struct dma_chan *chan; + + if (dma_spec->args_count != 3) + return NULL; + + list_for_each_entry(chan, &mdma->dma_dev.channels, device_node) { + struct mdc_chan *mchan = to_mdc_chan(chan); + + if (!(dma_spec->args[1] & BIT(mchan->chan_nr))) + continue; + if (dma_get_slave_channel(chan)) { + mchan->periph = dma_spec->args[0]; + mchan->thread = dma_spec->args[2]; + return chan; + } + } + + return NULL; +} + +#define PISTACHIO_CR_PERIPH_DMA_ROUTE(ch) (0x120 + 0x4 * ((ch) / 4)) +#define PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(ch) (8 * ((ch) % 4)) +#define PISTACHIO_CR_PERIPH_DMA_ROUTE_MASK 0x3f + +static void pistachio_mdc_enable_chan(struct mdc_chan *mchan) +{ + struct mdc_dma *mdma = mchan->mdma; + + regmap_update_bits(mdma->periph_regs, + PISTACHIO_CR_PERIPH_DMA_ROUTE(mchan->chan_nr), + PISTACHIO_CR_PERIPH_DMA_ROUTE_MASK << + PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(mchan->chan_nr), + mchan->periph << + PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(mchan->chan_nr)); +} + +static void pistachio_mdc_disable_chan(struct mdc_chan *mchan) +{ + struct mdc_dma *mdma = mchan->mdma; + + regmap_update_bits(mdma->periph_regs, + PISTACHIO_CR_PERIPH_DMA_ROUTE(mchan->chan_nr), + PISTACHIO_CR_PERIPH_DMA_ROUTE_MASK << + PISTACHIO_CR_PERIPH_DMA_ROUTE_SHIFT(mchan->chan_nr), + 0); +} + +static const struct mdc_dma_soc_data pistachio_mdc_data = { + .enable_chan = pistachio_mdc_enable_chan, + .disable_chan = pistachio_mdc_disable_chan, +}; + +static const struct of_device_id mdc_dma_of_match[] = { + { .compatible = "img,pistachio-mdc-dma", .data = &pistachio_mdc_data, }, + { }, +}; +MODULE_DEVICE_TABLE(of, mdc_dma_of_match); + +static int mdc_dma_probe(struct platform_device *pdev) +{ + struct mdc_dma *mdma; + struct resource *res; + const struct of_device_id *match; + unsigned int i; + u32 val; + int ret; + + mdma = devm_kzalloc(&pdev->dev, sizeof(*mdma), GFP_KERNEL); + if (!mdma) + return -ENOMEM; + platform_set_drvdata(pdev, mdma); + + match = of_match_device(mdc_dma_of_match, &pdev->dev); + mdma->soc = match->data; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mdma->regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mdma->regs)) + return PTR_ERR(mdma->regs); + + mdma->periph_regs = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, + "img,cr-periph"); + if (IS_ERR(mdma->periph_regs)) + return PTR_ERR(mdma->periph_regs); + + mdma->clk = devm_clk_get(&pdev->dev, "sys"); + if (IS_ERR(mdma->clk)) + return PTR_ERR(mdma->clk); + + ret = clk_prepare_enable(mdma->clk); + if (ret) + return ret; + + dma_cap_zero(mdma->dma_dev.cap_mask); + dma_cap_set(DMA_SLAVE, mdma->dma_dev.cap_mask); + dma_cap_set(DMA_PRIVATE, mdma->dma_dev.cap_mask); + dma_cap_set(DMA_CYCLIC, mdma->dma_dev.cap_mask); + dma_cap_set(DMA_MEMCPY, mdma->dma_dev.cap_mask); + + val = mdc_readl(mdma, MDC_GLOBAL_CONFIG_A); + mdma->nr_channels = (val >> MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_SHIFT) & + MDC_GLOBAL_CONFIG_A_DMA_CONTEXTS_MASK; + mdma->nr_threads = + 1 << ((val >> MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_SHIFT) & + MDC_GLOBAL_CONFIG_A_THREAD_ID_WIDTH_MASK); + mdma->bus_width = + (1 << ((val >> MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_SHIFT) & + MDC_GLOBAL_CONFIG_A_SYS_DAT_WIDTH_MASK)) / 8; + /* + * Although transfer sizes of up to MDC_TRANSFER_SIZE_MASK + 1 bytes + * are supported, this makes it possible for the value reported in + * MDC_ACTIVE_TRANSFER_SIZE to be ambiguous - an active transfer size + * of MDC_TRANSFER_SIZE_MASK may indicate either that 0 bytes or + * MDC_TRANSFER_SIZE_MASK + 1 bytes are remaining. To eliminate this + * ambiguity, restrict transfer sizes to one bus-width less than the + * actual maximum. + */ + mdma->max_xfer_size = MDC_TRANSFER_SIZE_MASK + 1 - mdma->bus_width; + + of_property_read_u32(pdev->dev.of_node, "dma-channels", + &mdma->nr_channels); + ret = of_property_read_u32(pdev->dev.of_node, + "img,max-burst-multiplier", + &mdma->max_burst_mult); + if (ret) + goto disable_clk; + + mdma->dma_dev.dev = &pdev->dev; + mdma->dma_dev.device_prep_slave_sg = mdc_prep_slave_sg; + mdma->dma_dev.device_prep_dma_cyclic = mdc_prep_dma_cyclic; + mdma->dma_dev.device_prep_dma_memcpy = mdc_prep_dma_memcpy; + mdma->dma_dev.device_free_chan_resources = mdc_free_chan_resources; + mdma->dma_dev.device_tx_status = mdc_tx_status; + mdma->dma_dev.device_issue_pending = mdc_issue_pending; + mdma->dma_dev.device_terminate_all = mdc_terminate_all; + mdma->dma_dev.device_config = mdc_slave_config; + + mdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + mdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + for (i = 1; i <= mdma->bus_width; i <<= 1) { + mdma->dma_dev.src_addr_widths |= BIT(i); + mdma->dma_dev.dst_addr_widths |= BIT(i); + } + + INIT_LIST_HEAD(&mdma->dma_dev.channels); + for (i = 0; i < mdma->nr_channels; i++) { + struct mdc_chan *mchan = &mdma->channels[i]; + + mchan->mdma = mdma; + mchan->chan_nr = i; + mchan->irq = platform_get_irq(pdev, i); + if (mchan->irq < 0) { + ret = mchan->irq; + goto disable_clk; + } + ret = devm_request_irq(&pdev->dev, mchan->irq, mdc_chan_irq, + IRQ_TYPE_LEVEL_HIGH, + dev_name(&pdev->dev), mchan); + if (ret < 0) + goto disable_clk; + + mchan->vc.desc_free = mdc_desc_free; + vchan_init(&mchan->vc, &mdma->dma_dev); + } + + mdma->desc_pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, + sizeof(struct mdc_hw_list_desc), + 4, 0); + if (!mdma->desc_pool) { + ret = -ENOMEM; + goto disable_clk; + } + + ret = dma_async_device_register(&mdma->dma_dev); + if (ret) + goto disable_clk; + + ret = of_dma_controller_register(pdev->dev.of_node, mdc_of_xlate, mdma); + if (ret) + goto unregister; + + dev_info(&pdev->dev, "MDC with %u channels and %u threads\n", + mdma->nr_channels, mdma->nr_threads); + + return 0; + +unregister: + dma_async_device_unregister(&mdma->dma_dev); +disable_clk: + clk_disable_unprepare(mdma->clk); + return ret; +} + +static int mdc_dma_remove(struct platform_device *pdev) +{ + struct mdc_dma *mdma = platform_get_drvdata(pdev); + struct mdc_chan *mchan, *next; + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&mdma->dma_dev); + + list_for_each_entry_safe(mchan, next, &mdma->dma_dev.channels, + vc.chan.device_node) { + list_del(&mchan->vc.chan.device_node); + + synchronize_irq(mchan->irq); + devm_free_irq(&pdev->dev, mchan->irq, mchan); + + tasklet_kill(&mchan->vc.task); + } + + clk_disable_unprepare(mdma->clk); + + return 0; +} + +static struct platform_driver mdc_dma_driver = { + .driver = { + .name = "img-mdc-dma", + .of_match_table = of_match_ptr(mdc_dma_of_match), + }, + .probe = mdc_dma_probe, + .remove = mdc_dma_remove, +}; +module_platform_driver(mdc_dma_driver); + +MODULE_DESCRIPTION("IMG Multi-threaded DMA Controller (MDC) driver"); +MODULE_AUTHOR("Andrew Bresticker <abrestic@chromium.org>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c new file mode 100644 index 000000000..eed405976 --- /dev/null +++ b/drivers/dma/imx-dma.c @@ -0,0 +1,1247 @@ +/* + * drivers/dma/imx-dma.c + * + * This file contains a driver for the Freescale i.MX DMA engine + * found on i.MX1/21/27 + * + * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> + * Copyright 2012 Javier Martin, Vista Silicon <javier.martin@vista-silicon.com> + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ +#include <linux/err.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> + +#include <asm/irq.h> +#include <linux/platform_data/dma-imx.h> + +#include "dmaengine.h" +#define IMXDMA_MAX_CHAN_DESCRIPTORS 16 +#define IMX_DMA_CHANNELS 16 + +#define IMX_DMA_2D_SLOTS 2 +#define IMX_DMA_2D_SLOT_A 0 +#define IMX_DMA_2D_SLOT_B 1 + +#define IMX_DMA_LENGTH_LOOP ((unsigned int)-1) +#define IMX_DMA_MEMSIZE_32 (0 << 4) +#define IMX_DMA_MEMSIZE_8 (1 << 4) +#define IMX_DMA_MEMSIZE_16 (2 << 4) +#define IMX_DMA_TYPE_LINEAR (0 << 10) +#define IMX_DMA_TYPE_2D (1 << 10) +#define IMX_DMA_TYPE_FIFO (2 << 10) + +#define IMX_DMA_ERR_BURST (1 << 0) +#define IMX_DMA_ERR_REQUEST (1 << 1) +#define IMX_DMA_ERR_TRANSFER (1 << 2) +#define IMX_DMA_ERR_BUFFER (1 << 3) +#define IMX_DMA_ERR_TIMEOUT (1 << 4) + +#define DMA_DCR 0x00 /* Control Register */ +#define DMA_DISR 0x04 /* Interrupt status Register */ +#define DMA_DIMR 0x08 /* Interrupt mask Register */ +#define DMA_DBTOSR 0x0c /* Burst timeout status Register */ +#define DMA_DRTOSR 0x10 /* Request timeout Register */ +#define DMA_DSESR 0x14 /* Transfer Error Status Register */ +#define DMA_DBOSR 0x18 /* Buffer overflow status Register */ +#define DMA_DBTOCR 0x1c /* Burst timeout control Register */ +#define DMA_WSRA 0x40 /* W-Size Register A */ +#define DMA_XSRA 0x44 /* X-Size Register A */ +#define DMA_YSRA 0x48 /* Y-Size Register A */ +#define DMA_WSRB 0x4c /* W-Size Register B */ +#define DMA_XSRB 0x50 /* X-Size Register B */ +#define DMA_YSRB 0x54 /* Y-Size Register B */ +#define DMA_SAR(x) (0x80 + ((x) << 6)) /* Source Address Registers */ +#define DMA_DAR(x) (0x84 + ((x) << 6)) /* Destination Address Registers */ +#define DMA_CNTR(x) (0x88 + ((x) << 6)) /* Count Registers */ +#define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */ +#define DMA_RSSR(x) (0x90 + ((x) << 6)) /* Request source select Registers */ +#define DMA_BLR(x) (0x94 + ((x) << 6)) /* Burst length Registers */ +#define DMA_RTOR(x) (0x98 + ((x) << 6)) /* Request timeout Registers */ +#define DMA_BUCR(x) (0x98 + ((x) << 6)) /* Bus Utilization Registers */ +#define DMA_CCNR(x) (0x9C + ((x) << 6)) /* Channel counter Registers */ + +#define DCR_DRST (1<<1) +#define DCR_DEN (1<<0) +#define DBTOCR_EN (1<<15) +#define DBTOCR_CNT(x) ((x) & 0x7fff) +#define CNTR_CNT(x) ((x) & 0xffffff) +#define CCR_ACRPT (1<<14) +#define CCR_DMOD_LINEAR (0x0 << 12) +#define CCR_DMOD_2D (0x1 << 12) +#define CCR_DMOD_FIFO (0x2 << 12) +#define CCR_DMOD_EOBFIFO (0x3 << 12) +#define CCR_SMOD_LINEAR (0x0 << 10) +#define CCR_SMOD_2D (0x1 << 10) +#define CCR_SMOD_FIFO (0x2 << 10) +#define CCR_SMOD_EOBFIFO (0x3 << 10) +#define CCR_MDIR_DEC (1<<9) +#define CCR_MSEL_B (1<<8) +#define CCR_DSIZ_32 (0x0 << 6) +#define CCR_DSIZ_8 (0x1 << 6) +#define CCR_DSIZ_16 (0x2 << 6) +#define CCR_SSIZ_32 (0x0 << 4) +#define CCR_SSIZ_8 (0x1 << 4) +#define CCR_SSIZ_16 (0x2 << 4) +#define CCR_REN (1<<3) +#define CCR_RPT (1<<2) +#define CCR_FRC (1<<1) +#define CCR_CEN (1<<0) +#define RTOR_EN (1<<15) +#define RTOR_CLK (1<<14) +#define RTOR_PSC (1<<13) + +enum imxdma_prep_type { + IMXDMA_DESC_MEMCPY, + IMXDMA_DESC_INTERLEAVED, + IMXDMA_DESC_SLAVE_SG, + IMXDMA_DESC_CYCLIC, +}; + +struct imx_dma_2d_config { + u16 xsr; + u16 ysr; + u16 wsr; + int count; +}; + +struct imxdma_desc { + struct list_head node; + struct dma_async_tx_descriptor desc; + enum dma_status status; + dma_addr_t src; + dma_addr_t dest; + size_t len; + enum dma_transfer_direction direction; + enum imxdma_prep_type type; + /* For memcpy and interleaved */ + unsigned int config_port; + unsigned int config_mem; + /* For interleaved transfers */ + unsigned int x; + unsigned int y; + unsigned int w; + /* For slave sg and cyclic */ + struct scatterlist *sg; + unsigned int sgcount; +}; + +struct imxdma_channel { + int hw_chaining; + struct timer_list watchdog; + struct imxdma_engine *imxdma; + unsigned int channel; + + struct tasklet_struct dma_tasklet; + struct list_head ld_free; + struct list_head ld_queue; + struct list_head ld_active; + int descs_allocated; + enum dma_slave_buswidth word_size; + dma_addr_t per_address; + u32 watermark_level; + struct dma_chan chan; + struct dma_async_tx_descriptor desc; + enum dma_status status; + int dma_request; + struct scatterlist *sg_list; + u32 ccr_from_device; + u32 ccr_to_device; + bool enabled_2d; + int slot_2d; +}; + +enum imx_dma_type { + IMX1_DMA, + IMX21_DMA, + IMX27_DMA, +}; + +struct imxdma_engine { + struct device *dev; + struct device_dma_parameters dma_parms; + struct dma_device dma_device; + void __iomem *base; + struct clk *dma_ahb; + struct clk *dma_ipg; + spinlock_t lock; + struct imx_dma_2d_config slots_2d[IMX_DMA_2D_SLOTS]; + struct imxdma_channel channel[IMX_DMA_CHANNELS]; + enum imx_dma_type devtype; +}; + +struct imxdma_filter_data { + struct imxdma_engine *imxdma; + int request; +}; + +static struct platform_device_id imx_dma_devtype[] = { + { + .name = "imx1-dma", + .driver_data = IMX1_DMA, + }, { + .name = "imx21-dma", + .driver_data = IMX21_DMA, + }, { + .name = "imx27-dma", + .driver_data = IMX27_DMA, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(platform, imx_dma_devtype); + +static const struct of_device_id imx_dma_of_dev_id[] = { + { + .compatible = "fsl,imx1-dma", + .data = &imx_dma_devtype[IMX1_DMA], + }, { + .compatible = "fsl,imx21-dma", + .data = &imx_dma_devtype[IMX21_DMA], + }, { + .compatible = "fsl,imx27-dma", + .data = &imx_dma_devtype[IMX27_DMA], + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, imx_dma_of_dev_id); + +static inline int is_imx1_dma(struct imxdma_engine *imxdma) +{ + return imxdma->devtype == IMX1_DMA; +} + +static inline int is_imx27_dma(struct imxdma_engine *imxdma) +{ + return imxdma->devtype == IMX27_DMA; +} + +static struct imxdma_channel *to_imxdma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct imxdma_channel, chan); +} + +static inline bool imxdma_chan_is_doing_cyclic(struct imxdma_channel *imxdmac) +{ + struct imxdma_desc *desc; + + if (!list_empty(&imxdmac->ld_active)) { + desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, + node); + if (desc->type == IMXDMA_DESC_CYCLIC) + return true; + } + return false; +} + + + +static void imx_dmav1_writel(struct imxdma_engine *imxdma, unsigned val, + unsigned offset) +{ + __raw_writel(val, imxdma->base + offset); +} + +static unsigned imx_dmav1_readl(struct imxdma_engine *imxdma, unsigned offset) +{ + return __raw_readl(imxdma->base + offset); +} + +static int imxdma_hw_chain(struct imxdma_channel *imxdmac) +{ + struct imxdma_engine *imxdma = imxdmac->imxdma; + + if (is_imx27_dma(imxdma)) + return imxdmac->hw_chaining; + else + return 0; +} + +/* + * imxdma_sg_next - prepare next chunk for scatter-gather DMA emulation + */ +static inline int imxdma_sg_next(struct imxdma_desc *d) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + struct scatterlist *sg = d->sg; + unsigned long now; + + now = min(d->len, sg_dma_len(sg)); + if (d->len != IMX_DMA_LENGTH_LOOP) + d->len -= now; + + if (d->direction == DMA_DEV_TO_MEM) + imx_dmav1_writel(imxdma, sg->dma_address, + DMA_DAR(imxdmac->channel)); + else + imx_dmav1_writel(imxdma, sg->dma_address, + DMA_SAR(imxdmac->channel)); + + imx_dmav1_writel(imxdma, now, DMA_CNTR(imxdmac->channel)); + + dev_dbg(imxdma->dev, " %s channel: %d dst 0x%08x, src 0x%08x, " + "size 0x%08x\n", __func__, imxdmac->channel, + imx_dmav1_readl(imxdma, DMA_DAR(imxdmac->channel)), + imx_dmav1_readl(imxdma, DMA_SAR(imxdmac->channel)), + imx_dmav1_readl(imxdma, DMA_CNTR(imxdmac->channel))); + + return now; +} + +static void imxdma_enable_hw(struct imxdma_desc *d) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + int channel = imxdmac->channel; + unsigned long flags; + + dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel); + + local_irq_save(flags); + + imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR); + imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) & + ~(1 << channel), DMA_DIMR); + imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) | + CCR_CEN | CCR_ACRPT, DMA_CCR(channel)); + + if (!is_imx1_dma(imxdma) && + d->sg && imxdma_hw_chain(imxdmac)) { + d->sg = sg_next(d->sg); + if (d->sg) { + u32 tmp; + imxdma_sg_next(d); + tmp = imx_dmav1_readl(imxdma, DMA_CCR(channel)); + imx_dmav1_writel(imxdma, tmp | CCR_RPT | CCR_ACRPT, + DMA_CCR(channel)); + } + } + + local_irq_restore(flags); +} + +static void imxdma_disable_hw(struct imxdma_channel *imxdmac) +{ + struct imxdma_engine *imxdma = imxdmac->imxdma; + int channel = imxdmac->channel; + unsigned long flags; + + dev_dbg(imxdma->dev, "%s channel %d\n", __func__, channel); + + if (imxdma_hw_chain(imxdmac)) + del_timer(&imxdmac->watchdog); + + local_irq_save(flags); + imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_DIMR) | + (1 << channel), DMA_DIMR); + imx_dmav1_writel(imxdma, imx_dmav1_readl(imxdma, DMA_CCR(channel)) & + ~CCR_CEN, DMA_CCR(channel)); + imx_dmav1_writel(imxdma, 1 << channel, DMA_DISR); + local_irq_restore(flags); +} + +static void imxdma_watchdog(unsigned long data) +{ + struct imxdma_channel *imxdmac = (struct imxdma_channel *)data; + struct imxdma_engine *imxdma = imxdmac->imxdma; + int channel = imxdmac->channel; + + imx_dmav1_writel(imxdma, 0, DMA_CCR(channel)); + + /* Tasklet watchdog error handler */ + tasklet_schedule(&imxdmac->dma_tasklet); + dev_dbg(imxdma->dev, "channel %d: watchdog timeout!\n", + imxdmac->channel); +} + +static irqreturn_t imxdma_err_handler(int irq, void *dev_id) +{ + struct imxdma_engine *imxdma = dev_id; + unsigned int err_mask; + int i, disr; + int errcode; + + disr = imx_dmav1_readl(imxdma, DMA_DISR); + + err_mask = imx_dmav1_readl(imxdma, DMA_DBTOSR) | + imx_dmav1_readl(imxdma, DMA_DRTOSR) | + imx_dmav1_readl(imxdma, DMA_DSESR) | + imx_dmav1_readl(imxdma, DMA_DBOSR); + + if (!err_mask) + return IRQ_HANDLED; + + imx_dmav1_writel(imxdma, disr & err_mask, DMA_DISR); + + for (i = 0; i < IMX_DMA_CHANNELS; i++) { + if (!(err_mask & (1 << i))) + continue; + errcode = 0; + + if (imx_dmav1_readl(imxdma, DMA_DBTOSR) & (1 << i)) { + imx_dmav1_writel(imxdma, 1 << i, DMA_DBTOSR); + errcode |= IMX_DMA_ERR_BURST; + } + if (imx_dmav1_readl(imxdma, DMA_DRTOSR) & (1 << i)) { + imx_dmav1_writel(imxdma, 1 << i, DMA_DRTOSR); + errcode |= IMX_DMA_ERR_REQUEST; + } + if (imx_dmav1_readl(imxdma, DMA_DSESR) & (1 << i)) { + imx_dmav1_writel(imxdma, 1 << i, DMA_DSESR); + errcode |= IMX_DMA_ERR_TRANSFER; + } + if (imx_dmav1_readl(imxdma, DMA_DBOSR) & (1 << i)) { + imx_dmav1_writel(imxdma, 1 << i, DMA_DBOSR); + errcode |= IMX_DMA_ERR_BUFFER; + } + /* Tasklet error handler */ + tasklet_schedule(&imxdma->channel[i].dma_tasklet); + + dev_warn(imxdma->dev, + "DMA timeout on channel %d -%s%s%s%s\n", i, + errcode & IMX_DMA_ERR_BURST ? " burst" : "", + errcode & IMX_DMA_ERR_REQUEST ? " request" : "", + errcode & IMX_DMA_ERR_TRANSFER ? " transfer" : "", + errcode & IMX_DMA_ERR_BUFFER ? " buffer" : ""); + } + return IRQ_HANDLED; +} + +static void dma_irq_handle_channel(struct imxdma_channel *imxdmac) +{ + struct imxdma_engine *imxdma = imxdmac->imxdma; + int chno = imxdmac->channel; + struct imxdma_desc *desc; + unsigned long flags; + + spin_lock_irqsave(&imxdma->lock, flags); + if (list_empty(&imxdmac->ld_active)) { + spin_unlock_irqrestore(&imxdma->lock, flags); + goto out; + } + + desc = list_first_entry(&imxdmac->ld_active, + struct imxdma_desc, + node); + spin_unlock_irqrestore(&imxdma->lock, flags); + + if (desc->sg) { + u32 tmp; + desc->sg = sg_next(desc->sg); + + if (desc->sg) { + imxdma_sg_next(desc); + + tmp = imx_dmav1_readl(imxdma, DMA_CCR(chno)); + + if (imxdma_hw_chain(imxdmac)) { + /* FIXME: The timeout should probably be + * configurable + */ + mod_timer(&imxdmac->watchdog, + jiffies + msecs_to_jiffies(500)); + + tmp |= CCR_CEN | CCR_RPT | CCR_ACRPT; + imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno)); + } else { + imx_dmav1_writel(imxdma, tmp & ~CCR_CEN, + DMA_CCR(chno)); + tmp |= CCR_CEN; + } + + imx_dmav1_writel(imxdma, tmp, DMA_CCR(chno)); + + if (imxdma_chan_is_doing_cyclic(imxdmac)) + /* Tasklet progression */ + tasklet_schedule(&imxdmac->dma_tasklet); + + return; + } + + if (imxdma_hw_chain(imxdmac)) { + del_timer(&imxdmac->watchdog); + return; + } + } + +out: + imx_dmav1_writel(imxdma, 0, DMA_CCR(chno)); + /* Tasklet irq */ + tasklet_schedule(&imxdmac->dma_tasklet); +} + +static irqreturn_t dma_irq_handler(int irq, void *dev_id) +{ + struct imxdma_engine *imxdma = dev_id; + int i, disr; + + if (!is_imx1_dma(imxdma)) + imxdma_err_handler(irq, dev_id); + + disr = imx_dmav1_readl(imxdma, DMA_DISR); + + dev_dbg(imxdma->dev, "%s called, disr=0x%08x\n", __func__, disr); + + imx_dmav1_writel(imxdma, disr, DMA_DISR); + for (i = 0; i < IMX_DMA_CHANNELS; i++) { + if (disr & (1 << i)) + dma_irq_handle_channel(&imxdma->channel[i]); + } + + return IRQ_HANDLED; +} + +static int imxdma_xfer_desc(struct imxdma_desc *d) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(d->desc.chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + int slot = -1; + int i; + + /* Configure and enable */ + switch (d->type) { + case IMXDMA_DESC_INTERLEAVED: + /* Try to get a free 2D slot */ + for (i = 0; i < IMX_DMA_2D_SLOTS; i++) { + if ((imxdma->slots_2d[i].count > 0) && + ((imxdma->slots_2d[i].xsr != d->x) || + (imxdma->slots_2d[i].ysr != d->y) || + (imxdma->slots_2d[i].wsr != d->w))) + continue; + slot = i; + break; + } + if (slot < 0) + return -EBUSY; + + imxdma->slots_2d[slot].xsr = d->x; + imxdma->slots_2d[slot].ysr = d->y; + imxdma->slots_2d[slot].wsr = d->w; + imxdma->slots_2d[slot].count++; + + imxdmac->slot_2d = slot; + imxdmac->enabled_2d = true; + + if (slot == IMX_DMA_2D_SLOT_A) { + d->config_mem &= ~CCR_MSEL_B; + d->config_port &= ~CCR_MSEL_B; + imx_dmav1_writel(imxdma, d->x, DMA_XSRA); + imx_dmav1_writel(imxdma, d->y, DMA_YSRA); + imx_dmav1_writel(imxdma, d->w, DMA_WSRA); + } else { + d->config_mem |= CCR_MSEL_B; + d->config_port |= CCR_MSEL_B; + imx_dmav1_writel(imxdma, d->x, DMA_XSRB); + imx_dmav1_writel(imxdma, d->y, DMA_YSRB); + imx_dmav1_writel(imxdma, d->w, DMA_WSRB); + } + /* + * We fall-through here intentionally, since a 2D transfer is + * similar to MEMCPY just adding the 2D slot configuration. + */ + case IMXDMA_DESC_MEMCPY: + imx_dmav1_writel(imxdma, d->src, DMA_SAR(imxdmac->channel)); + imx_dmav1_writel(imxdma, d->dest, DMA_DAR(imxdmac->channel)); + imx_dmav1_writel(imxdma, d->config_mem | (d->config_port << 2), + DMA_CCR(imxdmac->channel)); + + imx_dmav1_writel(imxdma, d->len, DMA_CNTR(imxdmac->channel)); + + dev_dbg(imxdma->dev, + "%s channel: %d dest=0x%08llx src=0x%08llx dma_length=%zu\n", + __func__, imxdmac->channel, + (unsigned long long)d->dest, + (unsigned long long)d->src, d->len); + + break; + /* Cyclic transfer is the same as slave_sg with special sg configuration. */ + case IMXDMA_DESC_CYCLIC: + case IMXDMA_DESC_SLAVE_SG: + if (d->direction == DMA_DEV_TO_MEM) { + imx_dmav1_writel(imxdma, imxdmac->per_address, + DMA_SAR(imxdmac->channel)); + imx_dmav1_writel(imxdma, imxdmac->ccr_from_device, + DMA_CCR(imxdmac->channel)); + + dev_dbg(imxdma->dev, + "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (dev2mem)\n", + __func__, imxdmac->channel, + d->sg, d->sgcount, d->len, + (unsigned long long)imxdmac->per_address); + } else if (d->direction == DMA_MEM_TO_DEV) { + imx_dmav1_writel(imxdma, imxdmac->per_address, + DMA_DAR(imxdmac->channel)); + imx_dmav1_writel(imxdma, imxdmac->ccr_to_device, + DMA_CCR(imxdmac->channel)); + + dev_dbg(imxdma->dev, + "%s channel: %d sg=%p sgcount=%d total length=%zu dev_addr=0x%08llx (mem2dev)\n", + __func__, imxdmac->channel, + d->sg, d->sgcount, d->len, + (unsigned long long)imxdmac->per_address); + } else { + dev_err(imxdma->dev, "%s channel: %d bad dma mode\n", + __func__, imxdmac->channel); + return -EINVAL; + } + + imxdma_sg_next(d); + + break; + default: + return -EINVAL; + } + imxdma_enable_hw(d); + return 0; +} + +static void imxdma_tasklet(unsigned long data) +{ + struct imxdma_channel *imxdmac = (void *)data; + struct imxdma_engine *imxdma = imxdmac->imxdma; + struct imxdma_desc *desc; + unsigned long flags; + + spin_lock_irqsave(&imxdma->lock, flags); + + if (list_empty(&imxdmac->ld_active)) { + /* Someone might have called terminate all */ + spin_unlock_irqrestore(&imxdma->lock, flags); + return; + } + desc = list_first_entry(&imxdmac->ld_active, struct imxdma_desc, node); + + /* If we are dealing with a cyclic descriptor, keep it on ld_active + * and dont mark the descriptor as complete. + * Only in non-cyclic cases it would be marked as complete + */ + if (imxdma_chan_is_doing_cyclic(imxdmac)) + goto out; + else + dma_cookie_complete(&desc->desc); + + /* Free 2D slot if it was an interleaved transfer */ + if (imxdmac->enabled_2d) { + imxdma->slots_2d[imxdmac->slot_2d].count--; + imxdmac->enabled_2d = false; + } + + list_move_tail(imxdmac->ld_active.next, &imxdmac->ld_free); + + if (!list_empty(&imxdmac->ld_queue)) { + desc = list_first_entry(&imxdmac->ld_queue, struct imxdma_desc, + node); + list_move_tail(imxdmac->ld_queue.next, &imxdmac->ld_active); + if (imxdma_xfer_desc(desc) < 0) + dev_warn(imxdma->dev, "%s: channel: %d couldn't xfer desc\n", + __func__, imxdmac->channel); + } +out: + spin_unlock_irqrestore(&imxdma->lock, flags); + + if (desc->desc.callback) + desc->desc.callback(desc->desc.callback_param); + +} + +static int imxdma_terminate_all(struct dma_chan *chan) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + unsigned long flags; + + imxdma_disable_hw(imxdmac); + + spin_lock_irqsave(&imxdma->lock, flags); + list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); + list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); + spin_unlock_irqrestore(&imxdma->lock, flags); + return 0; +} + +static int imxdma_config(struct dma_chan *chan, + struct dma_slave_config *dmaengine_cfg) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + unsigned int mode = 0; + + if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { + imxdmac->per_address = dmaengine_cfg->src_addr; + imxdmac->watermark_level = dmaengine_cfg->src_maxburst; + imxdmac->word_size = dmaengine_cfg->src_addr_width; + } else { + imxdmac->per_address = dmaengine_cfg->dst_addr; + imxdmac->watermark_level = dmaengine_cfg->dst_maxburst; + imxdmac->word_size = dmaengine_cfg->dst_addr_width; + } + + switch (imxdmac->word_size) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + mode = IMX_DMA_MEMSIZE_8; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + mode = IMX_DMA_MEMSIZE_16; + break; + default: + case DMA_SLAVE_BUSWIDTH_4_BYTES: + mode = IMX_DMA_MEMSIZE_32; + break; + } + + imxdmac->hw_chaining = 0; + + imxdmac->ccr_from_device = (mode | IMX_DMA_TYPE_FIFO) | + ((IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) << 2) | + CCR_REN; + imxdmac->ccr_to_device = + (IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR) | + ((mode | IMX_DMA_TYPE_FIFO) << 2) | CCR_REN; + imx_dmav1_writel(imxdma, imxdmac->dma_request, + DMA_RSSR(imxdmac->channel)); + + /* Set burst length */ + imx_dmav1_writel(imxdma, imxdmac->watermark_level * + imxdmac->word_size, DMA_BLR(imxdmac->channel)); + + return 0; +} + +static enum dma_status imxdma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + return dma_cookie_status(chan, cookie, txstate); +} + +static dma_cookie_t imxdma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(tx->chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + dma_cookie_t cookie; + unsigned long flags; + + spin_lock_irqsave(&imxdma->lock, flags); + list_move_tail(imxdmac->ld_free.next, &imxdmac->ld_queue); + cookie = dma_cookie_assign(tx); + spin_unlock_irqrestore(&imxdma->lock, flags); + + return cookie; +} + +static int imxdma_alloc_chan_resources(struct dma_chan *chan) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imx_dma_data *data = chan->private; + + if (data != NULL) + imxdmac->dma_request = data->dma_request; + + while (imxdmac->descs_allocated < IMXDMA_MAX_CHAN_DESCRIPTORS) { + struct imxdma_desc *desc; + + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) + break; + __memzero(&desc->desc, sizeof(struct dma_async_tx_descriptor)); + dma_async_tx_descriptor_init(&desc->desc, chan); + desc->desc.tx_submit = imxdma_tx_submit; + /* txd.flags will be overwritten in prep funcs */ + desc->desc.flags = DMA_CTRL_ACK; + desc->status = DMA_COMPLETE; + + list_add_tail(&desc->node, &imxdmac->ld_free); + imxdmac->descs_allocated++; + } + + if (!imxdmac->descs_allocated) + return -ENOMEM; + + return imxdmac->descs_allocated; +} + +static void imxdma_free_chan_resources(struct dma_chan *chan) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + struct imxdma_desc *desc, *_desc; + unsigned long flags; + + spin_lock_irqsave(&imxdma->lock, flags); + + imxdma_disable_hw(imxdmac); + list_splice_tail_init(&imxdmac->ld_active, &imxdmac->ld_free); + list_splice_tail_init(&imxdmac->ld_queue, &imxdmac->ld_free); + + spin_unlock_irqrestore(&imxdma->lock, flags); + + list_for_each_entry_safe(desc, _desc, &imxdmac->ld_free, node) { + kfree(desc); + imxdmac->descs_allocated--; + } + INIT_LIST_HEAD(&imxdmac->ld_free); + + kfree(imxdmac->sg_list); + imxdmac->sg_list = NULL; +} + +static struct dma_async_tx_descriptor *imxdma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct scatterlist *sg; + int i, dma_length = 0; + struct imxdma_desc *desc; + + if (list_empty(&imxdmac->ld_free) || + imxdma_chan_is_doing_cyclic(imxdmac)) + return NULL; + + desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); + + for_each_sg(sgl, sg, sg_len, i) { + dma_length += sg_dma_len(sg); + } + + switch (imxdmac->word_size) { + case DMA_SLAVE_BUSWIDTH_4_BYTES: + if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + if (sg_dma_len(sgl) & 1 || sgl->dma_address & 1) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_1_BYTE: + break; + default: + return NULL; + } + + desc->type = IMXDMA_DESC_SLAVE_SG; + desc->sg = sgl; + desc->sgcount = sg_len; + desc->len = dma_length; + desc->direction = direction; + if (direction == DMA_DEV_TO_MEM) { + desc->src = imxdmac->per_address; + } else { + desc->dest = imxdmac->per_address; + } + desc->desc.callback = NULL; + desc->desc.callback_param = NULL; + + return &desc->desc; +} + +static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + struct imxdma_desc *desc; + int i; + unsigned int periods = buf_len / period_len; + + dev_dbg(imxdma->dev, "%s channel: %d buf_len=%zu period_len=%zu\n", + __func__, imxdmac->channel, buf_len, period_len); + + if (list_empty(&imxdmac->ld_free) || + imxdma_chan_is_doing_cyclic(imxdmac)) + return NULL; + + desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); + + kfree(imxdmac->sg_list); + + imxdmac->sg_list = kcalloc(periods + 1, + sizeof(struct scatterlist), GFP_ATOMIC); + if (!imxdmac->sg_list) + return NULL; + + sg_init_table(imxdmac->sg_list, periods); + + for (i = 0; i < periods; i++) { + imxdmac->sg_list[i].page_link = 0; + imxdmac->sg_list[i].offset = 0; + imxdmac->sg_list[i].dma_address = dma_addr; + sg_dma_len(&imxdmac->sg_list[i]) = period_len; + dma_addr += period_len; + } + + /* close the loop */ + imxdmac->sg_list[periods].offset = 0; + sg_dma_len(&imxdmac->sg_list[periods]) = 0; + imxdmac->sg_list[periods].page_link = + ((unsigned long)imxdmac->sg_list | 0x01) & ~0x02; + + desc->type = IMXDMA_DESC_CYCLIC; + desc->sg = imxdmac->sg_list; + desc->sgcount = periods; + desc->len = IMX_DMA_LENGTH_LOOP; + desc->direction = direction; + if (direction == DMA_DEV_TO_MEM) { + desc->src = imxdmac->per_address; + } else { + desc->dest = imxdmac->per_address; + } + desc->desc.callback = NULL; + desc->desc.callback_param = NULL; + + return &desc->desc; +} + +static struct dma_async_tx_descriptor *imxdma_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, + dma_addr_t src, size_t len, unsigned long flags) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + struct imxdma_desc *desc; + + dev_dbg(imxdma->dev, "%s channel: %d src=0x%llx dst=0x%llx len=%zu\n", + __func__, imxdmac->channel, (unsigned long long)src, + (unsigned long long)dest, len); + + if (list_empty(&imxdmac->ld_free) || + imxdma_chan_is_doing_cyclic(imxdmac)) + return NULL; + + desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); + + desc->type = IMXDMA_DESC_MEMCPY; + desc->src = src; + desc->dest = dest; + desc->len = len; + desc->direction = DMA_MEM_TO_MEM; + desc->config_port = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; + desc->config_mem = IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR; + desc->desc.callback = NULL; + desc->desc.callback_param = NULL; + + return &desc->desc; +} + +static struct dma_async_tx_descriptor *imxdma_prep_dma_interleaved( + struct dma_chan *chan, struct dma_interleaved_template *xt, + unsigned long flags) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + struct imxdma_desc *desc; + + dev_dbg(imxdma->dev, "%s channel: %d src_start=0x%llx dst_start=0x%llx\n" + " src_sgl=%s dst_sgl=%s numf=%zu frame_size=%zu\n", __func__, + imxdmac->channel, (unsigned long long)xt->src_start, + (unsigned long long) xt->dst_start, + xt->src_sgl ? "true" : "false", xt->dst_sgl ? "true" : "false", + xt->numf, xt->frame_size); + + if (list_empty(&imxdmac->ld_free) || + imxdma_chan_is_doing_cyclic(imxdmac)) + return NULL; + + if (xt->frame_size != 1 || xt->numf <= 0 || xt->dir != DMA_MEM_TO_MEM) + return NULL; + + desc = list_first_entry(&imxdmac->ld_free, struct imxdma_desc, node); + + desc->type = IMXDMA_DESC_INTERLEAVED; + desc->src = xt->src_start; + desc->dest = xt->dst_start; + desc->x = xt->sgl[0].size; + desc->y = xt->numf; + desc->w = xt->sgl[0].icg + desc->x; + desc->len = desc->x * desc->y; + desc->direction = DMA_MEM_TO_MEM; + desc->config_port = IMX_DMA_MEMSIZE_32; + desc->config_mem = IMX_DMA_MEMSIZE_32; + if (xt->src_sgl) + desc->config_mem |= IMX_DMA_TYPE_2D; + if (xt->dst_sgl) + desc->config_port |= IMX_DMA_TYPE_2D; + desc->desc.callback = NULL; + desc->desc.callback_param = NULL; + + return &desc->desc; +} + +static void imxdma_issue_pending(struct dma_chan *chan) +{ + struct imxdma_channel *imxdmac = to_imxdma_chan(chan); + struct imxdma_engine *imxdma = imxdmac->imxdma; + struct imxdma_desc *desc; + unsigned long flags; + + spin_lock_irqsave(&imxdma->lock, flags); + if (list_empty(&imxdmac->ld_active) && + !list_empty(&imxdmac->ld_queue)) { + desc = list_first_entry(&imxdmac->ld_queue, + struct imxdma_desc, node); + + if (imxdma_xfer_desc(desc) < 0) { + dev_warn(imxdma->dev, + "%s: channel: %d couldn't issue DMA xfer\n", + __func__, imxdmac->channel); + } else { + list_move_tail(imxdmac->ld_queue.next, + &imxdmac->ld_active); + } + } + spin_unlock_irqrestore(&imxdma->lock, flags); +} + +static bool imxdma_filter_fn(struct dma_chan *chan, void *param) +{ + struct imxdma_filter_data *fdata = param; + struct imxdma_channel *imxdma_chan = to_imxdma_chan(chan); + + if (chan->device->dev != fdata->imxdma->dev) + return false; + + imxdma_chan->dma_request = fdata->request; + chan->private = NULL; + + return true; +} + +static struct dma_chan *imxdma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + int count = dma_spec->args_count; + struct imxdma_engine *imxdma = ofdma->of_dma_data; + struct imxdma_filter_data fdata = { + .imxdma = imxdma, + }; + + if (count != 1) + return NULL; + + fdata.request = dma_spec->args[0]; + + return dma_request_channel(imxdma->dma_device.cap_mask, + imxdma_filter_fn, &fdata); +} + +static int __init imxdma_probe(struct platform_device *pdev) + { + struct imxdma_engine *imxdma; + struct resource *res; + const struct of_device_id *of_id; + int ret, i; + int irq, irq_err; + + of_id = of_match_device(imx_dma_of_dev_id, &pdev->dev); + if (of_id) + pdev->id_entry = of_id->data; + + imxdma = devm_kzalloc(&pdev->dev, sizeof(*imxdma), GFP_KERNEL); + if (!imxdma) + return -ENOMEM; + + imxdma->dev = &pdev->dev; + imxdma->devtype = pdev->id_entry->driver_data; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + imxdma->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(imxdma->base)) + return PTR_ERR(imxdma->base); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + imxdma->dma_ipg = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(imxdma->dma_ipg)) + return PTR_ERR(imxdma->dma_ipg); + + imxdma->dma_ahb = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(imxdma->dma_ahb)) + return PTR_ERR(imxdma->dma_ahb); + + clk_prepare_enable(imxdma->dma_ipg); + clk_prepare_enable(imxdma->dma_ahb); + + /* reset DMA module */ + imx_dmav1_writel(imxdma, DCR_DRST, DMA_DCR); + + if (is_imx1_dma(imxdma)) { + ret = devm_request_irq(&pdev->dev, irq, + dma_irq_handler, 0, "DMA", imxdma); + if (ret) { + dev_warn(imxdma->dev, "Can't register IRQ for DMA\n"); + goto err; + } + + irq_err = platform_get_irq(pdev, 1); + if (irq_err < 0) { + ret = irq_err; + goto err; + } + + ret = devm_request_irq(&pdev->dev, irq_err, + imxdma_err_handler, 0, "DMA", imxdma); + if (ret) { + dev_warn(imxdma->dev, "Can't register ERRIRQ for DMA\n"); + goto err; + } + } + + /* enable DMA module */ + imx_dmav1_writel(imxdma, DCR_DEN, DMA_DCR); + + /* clear all interrupts */ + imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DISR); + + /* disable interrupts */ + imx_dmav1_writel(imxdma, (1 << IMX_DMA_CHANNELS) - 1, DMA_DIMR); + + INIT_LIST_HEAD(&imxdma->dma_device.channels); + + dma_cap_set(DMA_SLAVE, imxdma->dma_device.cap_mask); + dma_cap_set(DMA_CYCLIC, imxdma->dma_device.cap_mask); + dma_cap_set(DMA_MEMCPY, imxdma->dma_device.cap_mask); + dma_cap_set(DMA_INTERLEAVE, imxdma->dma_device.cap_mask); + + /* Initialize 2D global parameters */ + for (i = 0; i < IMX_DMA_2D_SLOTS; i++) + imxdma->slots_2d[i].count = 0; + + spin_lock_init(&imxdma->lock); + + /* Initialize channel parameters */ + for (i = 0; i < IMX_DMA_CHANNELS; i++) { + struct imxdma_channel *imxdmac = &imxdma->channel[i]; + + if (!is_imx1_dma(imxdma)) { + ret = devm_request_irq(&pdev->dev, irq + i, + dma_irq_handler, 0, "DMA", imxdma); + if (ret) { + dev_warn(imxdma->dev, "Can't register IRQ %d " + "for DMA channel %d\n", + irq + i, i); + goto err; + } + init_timer(&imxdmac->watchdog); + imxdmac->watchdog.function = &imxdma_watchdog; + imxdmac->watchdog.data = (unsigned long)imxdmac; + } + + imxdmac->imxdma = imxdma; + + INIT_LIST_HEAD(&imxdmac->ld_queue); + INIT_LIST_HEAD(&imxdmac->ld_free); + INIT_LIST_HEAD(&imxdmac->ld_active); + + tasklet_init(&imxdmac->dma_tasklet, imxdma_tasklet, + (unsigned long)imxdmac); + imxdmac->chan.device = &imxdma->dma_device; + dma_cookie_init(&imxdmac->chan); + imxdmac->channel = i; + + /* Add the channel to the DMAC list */ + list_add_tail(&imxdmac->chan.device_node, + &imxdma->dma_device.channels); + } + + imxdma->dma_device.dev = &pdev->dev; + + imxdma->dma_device.device_alloc_chan_resources = imxdma_alloc_chan_resources; + imxdma->dma_device.device_free_chan_resources = imxdma_free_chan_resources; + imxdma->dma_device.device_tx_status = imxdma_tx_status; + imxdma->dma_device.device_prep_slave_sg = imxdma_prep_slave_sg; + imxdma->dma_device.device_prep_dma_cyclic = imxdma_prep_dma_cyclic; + imxdma->dma_device.device_prep_dma_memcpy = imxdma_prep_dma_memcpy; + imxdma->dma_device.device_prep_interleaved_dma = imxdma_prep_dma_interleaved; + imxdma->dma_device.device_config = imxdma_config; + imxdma->dma_device.device_terminate_all = imxdma_terminate_all; + imxdma->dma_device.device_issue_pending = imxdma_issue_pending; + + platform_set_drvdata(pdev, imxdma); + + imxdma->dma_device.copy_align = 2; /* 2^2 = 4 bytes alignment */ + imxdma->dma_device.dev->dma_parms = &imxdma->dma_parms; + dma_set_max_seg_size(imxdma->dma_device.dev, 0xffffff); + + ret = dma_async_device_register(&imxdma->dma_device); + if (ret) { + dev_err(&pdev->dev, "unable to register\n"); + goto err; + } + + if (pdev->dev.of_node) { + ret = of_dma_controller_register(pdev->dev.of_node, + imxdma_xlate, imxdma); + if (ret) { + dev_err(&pdev->dev, "unable to register of_dma_controller\n"); + goto err_of_dma_controller; + } + } + + return 0; + +err_of_dma_controller: + dma_async_device_unregister(&imxdma->dma_device); +err: + clk_disable_unprepare(imxdma->dma_ipg); + clk_disable_unprepare(imxdma->dma_ahb); + return ret; +} + +static int imxdma_remove(struct platform_device *pdev) +{ + struct imxdma_engine *imxdma = platform_get_drvdata(pdev); + + dma_async_device_unregister(&imxdma->dma_device); + + if (pdev->dev.of_node) + of_dma_controller_free(pdev->dev.of_node); + + clk_disable_unprepare(imxdma->dma_ipg); + clk_disable_unprepare(imxdma->dma_ahb); + + return 0; +} + +static struct platform_driver imxdma_driver = { + .driver = { + .name = "imx-dma", + .of_match_table = imx_dma_of_dev_id, + }, + .id_table = imx_dma_devtype, + .remove = imxdma_remove, +}; + +static int __init imxdma_module_init(void) +{ + return platform_driver_probe(&imxdma_driver, imxdma_probe); +} +subsys_initcall(imxdma_module_init); + +MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); +MODULE_DESCRIPTION("i.MX dma driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c new file mode 100644 index 000000000..6d6cc3d21 --- /dev/null +++ b/drivers/dma/imx-sdma.c @@ -0,0 +1,1657 @@ +/* + * drivers/dma/imx-sdma.c + * + * This file contains a driver for the Freescale Smart DMA engine + * + * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de> + * + * Based on code from Freescale: + * + * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/types.h> +#include <linux/bitops.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/semaphore.h> +#include <linux/spinlock.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/firmware.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/dmaengine.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> + +#include <asm/irq.h> +#include <linux/platform_data/dma-imx-sdma.h> +#include <linux/platform_data/dma-imx.h> + +#include "dmaengine.h" + +/* SDMA registers */ +#define SDMA_H_C0PTR 0x000 +#define SDMA_H_INTR 0x004 +#define SDMA_H_STATSTOP 0x008 +#define SDMA_H_START 0x00c +#define SDMA_H_EVTOVR 0x010 +#define SDMA_H_DSPOVR 0x014 +#define SDMA_H_HOSTOVR 0x018 +#define SDMA_H_EVTPEND 0x01c +#define SDMA_H_DSPENBL 0x020 +#define SDMA_H_RESET 0x024 +#define SDMA_H_EVTERR 0x028 +#define SDMA_H_INTRMSK 0x02c +#define SDMA_H_PSW 0x030 +#define SDMA_H_EVTERRDBG 0x034 +#define SDMA_H_CONFIG 0x038 +#define SDMA_ONCE_ENB 0x040 +#define SDMA_ONCE_DATA 0x044 +#define SDMA_ONCE_INSTR 0x048 +#define SDMA_ONCE_STAT 0x04c +#define SDMA_ONCE_CMD 0x050 +#define SDMA_EVT_MIRROR 0x054 +#define SDMA_ILLINSTADDR 0x058 +#define SDMA_CHN0ADDR 0x05c +#define SDMA_ONCE_RTB 0x060 +#define SDMA_XTRIG_CONF1 0x070 +#define SDMA_XTRIG_CONF2 0x074 +#define SDMA_CHNENBL0_IMX35 0x200 +#define SDMA_CHNENBL0_IMX31 0x080 +#define SDMA_CHNPRI_0 0x100 + +/* + * Buffer descriptor status values. + */ +#define BD_DONE 0x01 +#define BD_WRAP 0x02 +#define BD_CONT 0x04 +#define BD_INTR 0x08 +#define BD_RROR 0x10 +#define BD_LAST 0x20 +#define BD_EXTD 0x80 + +/* + * Data Node descriptor status values. + */ +#define DND_END_OF_FRAME 0x80 +#define DND_END_OF_XFER 0x40 +#define DND_DONE 0x20 +#define DND_UNUSED 0x01 + +/* + * IPCV2 descriptor status values. + */ +#define BD_IPCV2_END_OF_FRAME 0x40 + +#define IPCV2_MAX_NODES 50 +/* + * Error bit set in the CCB status field by the SDMA, + * in setbd routine, in case of a transfer error + */ +#define DATA_ERROR 0x10000000 + +/* + * Buffer descriptor commands. + */ +#define C0_ADDR 0x01 +#define C0_LOAD 0x02 +#define C0_DUMP 0x03 +#define C0_SETCTX 0x07 +#define C0_GETCTX 0x03 +#define C0_SETDM 0x01 +#define C0_SETPM 0x04 +#define C0_GETDM 0x02 +#define C0_GETPM 0x08 +/* + * Change endianness indicator in the BD command field + */ +#define CHANGE_ENDIANNESS 0x80 + +/* + * Mode/Count of data node descriptors - IPCv2 + */ +struct sdma_mode_count { + u32 count : 16; /* size of the buffer pointed by this BD */ + u32 status : 8; /* E,R,I,C,W,D status bits stored here */ + u32 command : 8; /* command mostlky used for channel 0 */ +}; + +/* + * Buffer descriptor + */ +struct sdma_buffer_descriptor { + struct sdma_mode_count mode; + u32 buffer_addr; /* address of the buffer described */ + u32 ext_buffer_addr; /* extended buffer address */ +} __attribute__ ((packed)); + +/** + * struct sdma_channel_control - Channel control Block + * + * @current_bd_ptr current buffer descriptor processed + * @base_bd_ptr first element of buffer descriptor array + * @unused padding. The SDMA engine expects an array of 128 byte + * control blocks + */ +struct sdma_channel_control { + u32 current_bd_ptr; + u32 base_bd_ptr; + u32 unused[2]; +} __attribute__ ((packed)); + +/** + * struct sdma_state_registers - SDMA context for a channel + * + * @pc: program counter + * @t: test bit: status of arithmetic & test instruction + * @rpc: return program counter + * @sf: source fault while loading data + * @spc: loop start program counter + * @df: destination fault while storing data + * @epc: loop end program counter + * @lm: loop mode + */ +struct sdma_state_registers { + u32 pc :14; + u32 unused1: 1; + u32 t : 1; + u32 rpc :14; + u32 unused0: 1; + u32 sf : 1; + u32 spc :14; + u32 unused2: 1; + u32 df : 1; + u32 epc :14; + u32 lm : 2; +} __attribute__ ((packed)); + +/** + * struct sdma_context_data - sdma context specific to a channel + * + * @channel_state: channel state bits + * @gReg: general registers + * @mda: burst dma destination address register + * @msa: burst dma source address register + * @ms: burst dma status register + * @md: burst dma data register + * @pda: peripheral dma destination address register + * @psa: peripheral dma source address register + * @ps: peripheral dma status register + * @pd: peripheral dma data register + * @ca: CRC polynomial register + * @cs: CRC accumulator register + * @dda: dedicated core destination address register + * @dsa: dedicated core source address register + * @ds: dedicated core status register + * @dd: dedicated core data register + */ +struct sdma_context_data { + struct sdma_state_registers channel_state; + u32 gReg[8]; + u32 mda; + u32 msa; + u32 ms; + u32 md; + u32 pda; + u32 psa; + u32 ps; + u32 pd; + u32 ca; + u32 cs; + u32 dda; + u32 dsa; + u32 ds; + u32 dd; + u32 scratch0; + u32 scratch1; + u32 scratch2; + u32 scratch3; + u32 scratch4; + u32 scratch5; + u32 scratch6; + u32 scratch7; +} __attribute__ ((packed)); + +#define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor)) + +struct sdma_engine; + +/** + * struct sdma_channel - housekeeping for a SDMA channel + * + * @sdma pointer to the SDMA engine for this channel + * @channel the channel number, matches dmaengine chan_id + 1 + * @direction transfer type. Needed for setting SDMA script + * @peripheral_type Peripheral type. Needed for setting SDMA script + * @event_id0 aka dma request line + * @event_id1 for channels that use 2 events + * @word_size peripheral access size + * @buf_tail ID of the buffer that was processed + * @num_bd max NUM_BD. number of descriptors currently handling + */ +struct sdma_channel { + struct sdma_engine *sdma; + unsigned int channel; + enum dma_transfer_direction direction; + enum sdma_peripheral_type peripheral_type; + unsigned int event_id0; + unsigned int event_id1; + enum dma_slave_buswidth word_size; + unsigned int buf_tail; + unsigned int num_bd; + unsigned int period_len; + struct sdma_buffer_descriptor *bd; + dma_addr_t bd_phys; + unsigned int pc_from_device, pc_to_device; + unsigned long flags; + dma_addr_t per_address; + unsigned long event_mask[2]; + unsigned long watermark_level; + u32 shp_addr, per_addr; + struct dma_chan chan; + spinlock_t lock; + struct dma_async_tx_descriptor desc; + enum dma_status status; + unsigned int chn_count; + unsigned int chn_real_count; + struct tasklet_struct tasklet; + struct imx_dma_data data; +}; + +#define IMX_DMA_SG_LOOP BIT(0) + +#define MAX_DMA_CHANNELS 32 +#define MXC_SDMA_DEFAULT_PRIORITY 1 +#define MXC_SDMA_MIN_PRIORITY 1 +#define MXC_SDMA_MAX_PRIORITY 7 + +#define SDMA_FIRMWARE_MAGIC 0x414d4453 + +/** + * struct sdma_firmware_header - Layout of the firmware image + * + * @magic "SDMA" + * @version_major increased whenever layout of struct sdma_script_start_addrs + * changes. + * @version_minor firmware minor version (for binary compatible changes) + * @script_addrs_start offset of struct sdma_script_start_addrs in this image + * @num_script_addrs Number of script addresses in this image + * @ram_code_start offset of SDMA ram image in this firmware image + * @ram_code_size size of SDMA ram image + * @script_addrs Stores the start address of the SDMA scripts + * (in SDMA memory space) + */ +struct sdma_firmware_header { + u32 magic; + u32 version_major; + u32 version_minor; + u32 script_addrs_start; + u32 num_script_addrs; + u32 ram_code_start; + u32 ram_code_size; +}; + +struct sdma_driver_data { + int chnenbl0; + int num_events; + struct sdma_script_start_addrs *script_addrs; +}; + +struct sdma_engine { + struct device *dev; + struct device_dma_parameters dma_parms; + struct sdma_channel channel[MAX_DMA_CHANNELS]; + struct sdma_channel_control *channel_control; + void __iomem *regs; + struct sdma_context_data *context; + dma_addr_t context_phys; + struct dma_device dma_device; + struct clk *clk_ipg; + struct clk *clk_ahb; + spinlock_t channel_0_lock; + u32 script_number; + struct sdma_script_start_addrs *script_addrs; + const struct sdma_driver_data *drvdata; +}; + +static struct sdma_driver_data sdma_imx31 = { + .chnenbl0 = SDMA_CHNENBL0_IMX31, + .num_events = 32, +}; + +static struct sdma_script_start_addrs sdma_script_imx25 = { + .ap_2_ap_addr = 729, + .uart_2_mcu_addr = 904, + .per_2_app_addr = 1255, + .mcu_2_app_addr = 834, + .uartsh_2_mcu_addr = 1120, + .per_2_shp_addr = 1329, + .mcu_2_shp_addr = 1048, + .ata_2_mcu_addr = 1560, + .mcu_2_ata_addr = 1479, + .app_2_per_addr = 1189, + .app_2_mcu_addr = 770, + .shp_2_per_addr = 1407, + .shp_2_mcu_addr = 979, +}; + +static struct sdma_driver_data sdma_imx25 = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx25, +}; + +static struct sdma_driver_data sdma_imx35 = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, +}; + +static struct sdma_script_start_addrs sdma_script_imx51 = { + .ap_2_ap_addr = 642, + .uart_2_mcu_addr = 817, + .mcu_2_app_addr = 747, + .mcu_2_shp_addr = 961, + .ata_2_mcu_addr = 1473, + .mcu_2_ata_addr = 1392, + .app_2_per_addr = 1033, + .app_2_mcu_addr = 683, + .shp_2_per_addr = 1251, + .shp_2_mcu_addr = 892, +}; + +static struct sdma_driver_data sdma_imx51 = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx51, +}; + +static struct sdma_script_start_addrs sdma_script_imx53 = { + .ap_2_ap_addr = 642, + .app_2_mcu_addr = 683, + .mcu_2_app_addr = 747, + .uart_2_mcu_addr = 817, + .shp_2_mcu_addr = 891, + .mcu_2_shp_addr = 960, + .uartsh_2_mcu_addr = 1032, + .spdif_2_mcu_addr = 1100, + .mcu_2_spdif_addr = 1134, + .firi_2_mcu_addr = 1193, + .mcu_2_firi_addr = 1290, +}; + +static struct sdma_driver_data sdma_imx53 = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx53, +}; + +static struct sdma_script_start_addrs sdma_script_imx6q = { + .ap_2_ap_addr = 642, + .uart_2_mcu_addr = 817, + .mcu_2_app_addr = 747, + .per_2_per_addr = 6331, + .uartsh_2_mcu_addr = 1032, + .mcu_2_shp_addr = 960, + .app_2_mcu_addr = 683, + .shp_2_mcu_addr = 891, + .spdif_2_mcu_addr = 1100, + .mcu_2_spdif_addr = 1134, +}; + +static struct sdma_driver_data sdma_imx6q = { + .chnenbl0 = SDMA_CHNENBL0_IMX35, + .num_events = 48, + .script_addrs = &sdma_script_imx6q, +}; + +static struct platform_device_id sdma_devtypes[] = { + { + .name = "imx25-sdma", + .driver_data = (unsigned long)&sdma_imx25, + }, { + .name = "imx31-sdma", + .driver_data = (unsigned long)&sdma_imx31, + }, { + .name = "imx35-sdma", + .driver_data = (unsigned long)&sdma_imx35, + }, { + .name = "imx51-sdma", + .driver_data = (unsigned long)&sdma_imx51, + }, { + .name = "imx53-sdma", + .driver_data = (unsigned long)&sdma_imx53, + }, { + .name = "imx6q-sdma", + .driver_data = (unsigned long)&sdma_imx6q, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(platform, sdma_devtypes); + +static const struct of_device_id sdma_dt_ids[] = { + { .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, }, + { .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, }, + { .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, }, + { .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, }, + { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, }, + { .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, sdma_dt_ids); + +#define SDMA_H_CONFIG_DSPDMA BIT(12) /* indicates if the DSPDMA is used */ +#define SDMA_H_CONFIG_RTD_PINS BIT(11) /* indicates if Real-Time Debug pins are enabled */ +#define SDMA_H_CONFIG_ACR BIT(4) /* indicates if AHB freq /core freq = 2 or 1 */ +#define SDMA_H_CONFIG_CSM (3) /* indicates which context switch mode is selected*/ + +static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event) +{ + u32 chnenbl0 = sdma->drvdata->chnenbl0; + return chnenbl0 + event * 4; +} + +static int sdma_config_ownership(struct sdma_channel *sdmac, + bool event_override, bool mcu_override, bool dsp_override) +{ + struct sdma_engine *sdma = sdmac->sdma; + int channel = sdmac->channel; + unsigned long evt, mcu, dsp; + + if (event_override && mcu_override && dsp_override) + return -EINVAL; + + evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR); + mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR); + dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR); + + if (dsp_override) + __clear_bit(channel, &dsp); + else + __set_bit(channel, &dsp); + + if (event_override) + __clear_bit(channel, &evt); + else + __set_bit(channel, &evt); + + if (mcu_override) + __clear_bit(channel, &mcu); + else + __set_bit(channel, &mcu); + + writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR); + writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR); + writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR); + + return 0; +} + +static void sdma_enable_channel(struct sdma_engine *sdma, int channel) +{ + writel(BIT(channel), sdma->regs + SDMA_H_START); +} + +/* + * sdma_run_channel0 - run a channel and wait till it's done + */ +static int sdma_run_channel0(struct sdma_engine *sdma) +{ + int ret; + unsigned long timeout = 500; + + sdma_enable_channel(sdma, 0); + + while (!(ret = readl_relaxed(sdma->regs + SDMA_H_INTR) & 1)) { + if (timeout-- <= 0) + break; + udelay(1); + } + + if (ret) { + /* Clear the interrupt status */ + writel_relaxed(ret, sdma->regs + SDMA_H_INTR); + } else { + dev_err(sdma->dev, "Timeout waiting for CH0 ready\n"); + } + + /* Set bits of CONFIG register with dynamic context switching */ + if (readl(sdma->regs + SDMA_H_CONFIG) == 0) + writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG); + + return ret ? 0 : -ETIMEDOUT; +} + +static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size, + u32 address) +{ + struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; + void *buf_virt; + dma_addr_t buf_phys; + int ret; + unsigned long flags; + + buf_virt = dma_alloc_coherent(NULL, + size, + &buf_phys, GFP_KERNEL); + if (!buf_virt) { + return -ENOMEM; + } + + spin_lock_irqsave(&sdma->channel_0_lock, flags); + + bd0->mode.command = C0_SETPM; + bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; + bd0->mode.count = size / 2; + bd0->buffer_addr = buf_phys; + bd0->ext_buffer_addr = address; + + memcpy(buf_virt, buf, size); + + ret = sdma_run_channel0(sdma); + + spin_unlock_irqrestore(&sdma->channel_0_lock, flags); + + dma_free_coherent(NULL, size, buf_virt, buf_phys); + + return ret; +} + +static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event) +{ + struct sdma_engine *sdma = sdmac->sdma; + int channel = sdmac->channel; + unsigned long val; + u32 chnenbl = chnenbl_ofs(sdma, event); + + val = readl_relaxed(sdma->regs + chnenbl); + __set_bit(channel, &val); + writel_relaxed(val, sdma->regs + chnenbl); +} + +static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event) +{ + struct sdma_engine *sdma = sdmac->sdma; + int channel = sdmac->channel; + u32 chnenbl = chnenbl_ofs(sdma, event); + unsigned long val; + + val = readl_relaxed(sdma->regs + chnenbl); + __clear_bit(channel, &val); + writel_relaxed(val, sdma->regs + chnenbl); +} + +static void sdma_handle_channel_loop(struct sdma_channel *sdmac) +{ + if (sdmac->desc.callback) + sdmac->desc.callback(sdmac->desc.callback_param); +} + +static void sdma_update_channel_loop(struct sdma_channel *sdmac) +{ + struct sdma_buffer_descriptor *bd; + + /* + * loop mode. Iterate over descriptors, re-setup them and + * call callback function. + */ + while (1) { + bd = &sdmac->bd[sdmac->buf_tail]; + + if (bd->mode.status & BD_DONE) + break; + + if (bd->mode.status & BD_RROR) + sdmac->status = DMA_ERROR; + + bd->mode.status |= BD_DONE; + sdmac->buf_tail++; + sdmac->buf_tail %= sdmac->num_bd; + } +} + +static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac) +{ + struct sdma_buffer_descriptor *bd; + int i, error = 0; + + sdmac->chn_real_count = 0; + /* + * non loop mode. Iterate over all descriptors, collect + * errors and call callback function + */ + for (i = 0; i < sdmac->num_bd; i++) { + bd = &sdmac->bd[i]; + + if (bd->mode.status & (BD_DONE | BD_RROR)) + error = -EIO; + sdmac->chn_real_count += bd->mode.count; + } + + if (error) + sdmac->status = DMA_ERROR; + else + sdmac->status = DMA_COMPLETE; + + dma_cookie_complete(&sdmac->desc); + if (sdmac->desc.callback) + sdmac->desc.callback(sdmac->desc.callback_param); +} + +static void sdma_tasklet(unsigned long data) +{ + struct sdma_channel *sdmac = (struct sdma_channel *) data; + + if (sdmac->flags & IMX_DMA_SG_LOOP) + sdma_handle_channel_loop(sdmac); + else + mxc_sdma_handle_channel_normal(sdmac); +} + +static irqreturn_t sdma_int_handler(int irq, void *dev_id) +{ + struct sdma_engine *sdma = dev_id; + unsigned long stat; + + stat = readl_relaxed(sdma->regs + SDMA_H_INTR); + /* not interested in channel 0 interrupts */ + stat &= ~1; + writel_relaxed(stat, sdma->regs + SDMA_H_INTR); + + while (stat) { + int channel = fls(stat) - 1; + struct sdma_channel *sdmac = &sdma->channel[channel]; + + if (sdmac->flags & IMX_DMA_SG_LOOP) + sdma_update_channel_loop(sdmac); + + tasklet_schedule(&sdmac->tasklet); + + __clear_bit(channel, &stat); + } + + return IRQ_HANDLED; +} + +/* + * sets the pc of SDMA script according to the peripheral type + */ +static void sdma_get_pc(struct sdma_channel *sdmac, + enum sdma_peripheral_type peripheral_type) +{ + struct sdma_engine *sdma = sdmac->sdma; + int per_2_emi = 0, emi_2_per = 0; + /* + * These are needed once we start to support transfers between + * two peripherals or memory-to-memory transfers + */ + int per_2_per = 0, emi_2_emi = 0; + + sdmac->pc_from_device = 0; + sdmac->pc_to_device = 0; + + switch (peripheral_type) { + case IMX_DMATYPE_MEMORY: + emi_2_emi = sdma->script_addrs->ap_2_ap_addr; + break; + case IMX_DMATYPE_DSP: + emi_2_per = sdma->script_addrs->bp_2_ap_addr; + per_2_emi = sdma->script_addrs->ap_2_bp_addr; + break; + case IMX_DMATYPE_FIRI: + per_2_emi = sdma->script_addrs->firi_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_firi_addr; + break; + case IMX_DMATYPE_UART: + per_2_emi = sdma->script_addrs->uart_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_app_addr; + break; + case IMX_DMATYPE_UART_SP: + per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_shp_addr; + break; + case IMX_DMATYPE_ATA: + per_2_emi = sdma->script_addrs->ata_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_ata_addr; + break; + case IMX_DMATYPE_CSPI: + case IMX_DMATYPE_EXT: + case IMX_DMATYPE_SSI: + case IMX_DMATYPE_SAI: + per_2_emi = sdma->script_addrs->app_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_app_addr; + break; + case IMX_DMATYPE_SSI_DUAL: + per_2_emi = sdma->script_addrs->ssish_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_ssish_addr; + break; + case IMX_DMATYPE_SSI_SP: + case IMX_DMATYPE_MMC: + case IMX_DMATYPE_SDHC: + case IMX_DMATYPE_CSPI_SP: + case IMX_DMATYPE_ESAI: + case IMX_DMATYPE_MSHC_SP: + per_2_emi = sdma->script_addrs->shp_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_shp_addr; + break; + case IMX_DMATYPE_ASRC: + per_2_emi = sdma->script_addrs->asrc_2_mcu_addr; + emi_2_per = sdma->script_addrs->asrc_2_mcu_addr; + per_2_per = sdma->script_addrs->per_2_per_addr; + break; + case IMX_DMATYPE_ASRC_SP: + per_2_emi = sdma->script_addrs->shp_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_shp_addr; + per_2_per = sdma->script_addrs->per_2_per_addr; + break; + case IMX_DMATYPE_MSHC: + per_2_emi = sdma->script_addrs->mshc_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_mshc_addr; + break; + case IMX_DMATYPE_CCM: + per_2_emi = sdma->script_addrs->dptc_dvfs_addr; + break; + case IMX_DMATYPE_SPDIF: + per_2_emi = sdma->script_addrs->spdif_2_mcu_addr; + emi_2_per = sdma->script_addrs->mcu_2_spdif_addr; + break; + case IMX_DMATYPE_IPU_MEMORY: + emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr; + break; + default: + break; + } + + sdmac->pc_from_device = per_2_emi; + sdmac->pc_to_device = emi_2_per; +} + +static int sdma_load_context(struct sdma_channel *sdmac) +{ + struct sdma_engine *sdma = sdmac->sdma; + int channel = sdmac->channel; + int load_address; + struct sdma_context_data *context = sdma->context; + struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd; + int ret; + unsigned long flags; + + if (sdmac->direction == DMA_DEV_TO_MEM) { + load_address = sdmac->pc_from_device; + } else { + load_address = sdmac->pc_to_device; + } + + if (load_address < 0) + return load_address; + + dev_dbg(sdma->dev, "load_address = %d\n", load_address); + dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level); + dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr); + dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr); + dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]); + dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]); + + spin_lock_irqsave(&sdma->channel_0_lock, flags); + + memset(context, 0, sizeof(*context)); + context->channel_state.pc = load_address; + + /* Send by context the event mask,base address for peripheral + * and watermark level + */ + context->gReg[0] = sdmac->event_mask[1]; + context->gReg[1] = sdmac->event_mask[0]; + context->gReg[2] = sdmac->per_addr; + context->gReg[6] = sdmac->shp_addr; + context->gReg[7] = sdmac->watermark_level; + + bd0->mode.command = C0_SETDM; + bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD; + bd0->mode.count = sizeof(*context) / 4; + bd0->buffer_addr = sdma->context_phys; + bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel; + ret = sdma_run_channel0(sdma); + + spin_unlock_irqrestore(&sdma->channel_0_lock, flags); + + return ret; +} + +static struct sdma_channel *to_sdma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct sdma_channel, chan); +} + +static int sdma_disable_channel(struct dma_chan *chan) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct sdma_engine *sdma = sdmac->sdma; + int channel = sdmac->channel; + + writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP); + sdmac->status = DMA_ERROR; + + return 0; +} + +static int sdma_config_channel(struct dma_chan *chan) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + int ret; + + sdma_disable_channel(chan); + + sdmac->event_mask[0] = 0; + sdmac->event_mask[1] = 0; + sdmac->shp_addr = 0; + sdmac->per_addr = 0; + + if (sdmac->event_id0) { + if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events) + return -EINVAL; + sdma_event_enable(sdmac, sdmac->event_id0); + } + + switch (sdmac->peripheral_type) { + case IMX_DMATYPE_DSP: + sdma_config_ownership(sdmac, false, true, true); + break; + case IMX_DMATYPE_MEMORY: + sdma_config_ownership(sdmac, false, true, false); + break; + default: + sdma_config_ownership(sdmac, true, true, false); + break; + } + + sdma_get_pc(sdmac, sdmac->peripheral_type); + + if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) && + (sdmac->peripheral_type != IMX_DMATYPE_DSP)) { + /* Handle multiple event channels differently */ + if (sdmac->event_id1) { + sdmac->event_mask[1] = BIT(sdmac->event_id1 % 32); + if (sdmac->event_id1 > 31) + __set_bit(31, &sdmac->watermark_level); + sdmac->event_mask[0] = BIT(sdmac->event_id0 % 32); + if (sdmac->event_id0 > 31) + __set_bit(30, &sdmac->watermark_level); + } else { + __set_bit(sdmac->event_id0, sdmac->event_mask); + } + /* Watermark Level */ + sdmac->watermark_level |= sdmac->watermark_level; + /* Address */ + sdmac->shp_addr = sdmac->per_address; + } else { + sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */ + } + + ret = sdma_load_context(sdmac); + + return ret; +} + +static int sdma_set_channel_priority(struct sdma_channel *sdmac, + unsigned int priority) +{ + struct sdma_engine *sdma = sdmac->sdma; + int channel = sdmac->channel; + + if (priority < MXC_SDMA_MIN_PRIORITY + || priority > MXC_SDMA_MAX_PRIORITY) { + return -EINVAL; + } + + writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel); + + return 0; +} + +static int sdma_request_channel(struct sdma_channel *sdmac) +{ + struct sdma_engine *sdma = sdmac->sdma; + int channel = sdmac->channel; + int ret = -EBUSY; + + sdmac->bd = dma_zalloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys, + GFP_KERNEL); + if (!sdmac->bd) { + ret = -ENOMEM; + goto out; + } + + sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys; + sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; + + sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY); + return 0; +out: + + return ret; +} + +static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + unsigned long flags; + struct sdma_channel *sdmac = to_sdma_chan(tx->chan); + dma_cookie_t cookie; + + spin_lock_irqsave(&sdmac->lock, flags); + + cookie = dma_cookie_assign(tx); + + spin_unlock_irqrestore(&sdmac->lock, flags); + + return cookie; +} + +static int sdma_alloc_chan_resources(struct dma_chan *chan) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct imx_dma_data *data = chan->private; + int prio, ret; + + if (!data) + return -EINVAL; + + switch (data->priority) { + case DMA_PRIO_HIGH: + prio = 3; + break; + case DMA_PRIO_MEDIUM: + prio = 2; + break; + case DMA_PRIO_LOW: + default: + prio = 1; + break; + } + + sdmac->peripheral_type = data->peripheral_type; + sdmac->event_id0 = data->dma_request; + + clk_enable(sdmac->sdma->clk_ipg); + clk_enable(sdmac->sdma->clk_ahb); + + ret = sdma_request_channel(sdmac); + if (ret) + return ret; + + ret = sdma_set_channel_priority(sdmac, prio); + if (ret) + return ret; + + dma_async_tx_descriptor_init(&sdmac->desc, chan); + sdmac->desc.tx_submit = sdma_tx_submit; + /* txd.flags will be overwritten in prep funcs */ + sdmac->desc.flags = DMA_CTRL_ACK; + + return 0; +} + +static void sdma_free_chan_resources(struct dma_chan *chan) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct sdma_engine *sdma = sdmac->sdma; + + sdma_disable_channel(chan); + + if (sdmac->event_id0) + sdma_event_disable(sdmac, sdmac->event_id0); + if (sdmac->event_id1) + sdma_event_disable(sdmac, sdmac->event_id1); + + sdmac->event_id0 = 0; + sdmac->event_id1 = 0; + + sdma_set_channel_priority(sdmac, 0); + + dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys); + + clk_disable(sdma->clk_ipg); + clk_disable(sdma->clk_ahb); +} + +static struct dma_async_tx_descriptor *sdma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct sdma_engine *sdma = sdmac->sdma; + int ret, i, count; + int channel = sdmac->channel; + struct scatterlist *sg; + + if (sdmac->status == DMA_IN_PROGRESS) + return NULL; + sdmac->status = DMA_IN_PROGRESS; + + sdmac->flags = 0; + + sdmac->buf_tail = 0; + + dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n", + sg_len, channel); + + sdmac->direction = direction; + ret = sdma_load_context(sdmac); + if (ret) + goto err_out; + + if (sg_len > NUM_BD) { + dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", + channel, sg_len, NUM_BD); + ret = -EINVAL; + goto err_out; + } + + sdmac->chn_count = 0; + for_each_sg(sgl, sg, sg_len, i) { + struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; + int param; + + bd->buffer_addr = sg->dma_address; + + count = sg_dma_len(sg); + + if (count > 0xffff) { + dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n", + channel, count, 0xffff); + ret = -EINVAL; + goto err_out; + } + + bd->mode.count = count; + sdmac->chn_count += count; + + if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) { + ret = -EINVAL; + goto err_out; + } + + switch (sdmac->word_size) { + case DMA_SLAVE_BUSWIDTH_4_BYTES: + bd->mode.command = 0; + if (count & 3 || sg->dma_address & 3) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + bd->mode.command = 2; + if (count & 1 || sg->dma_address & 1) + return NULL; + break; + case DMA_SLAVE_BUSWIDTH_1_BYTE: + bd->mode.command = 1; + break; + default: + return NULL; + } + + param = BD_DONE | BD_EXTD | BD_CONT; + + if (i + 1 == sg_len) { + param |= BD_INTR; + param |= BD_LAST; + param &= ~BD_CONT; + } + + dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n", + i, count, (u64)sg->dma_address, + param & BD_WRAP ? "wrap" : "", + param & BD_INTR ? " intr" : ""); + + bd->mode.status = param; + } + + sdmac->num_bd = sg_len; + sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; + + return &sdmac->desc; +err_out: + sdmac->status = DMA_ERROR; + return NULL; +} + +static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct sdma_engine *sdma = sdmac->sdma; + int num_periods = buf_len / period_len; + int channel = sdmac->channel; + int ret, i = 0, buf = 0; + + dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel); + + if (sdmac->status == DMA_IN_PROGRESS) + return NULL; + + sdmac->status = DMA_IN_PROGRESS; + + sdmac->buf_tail = 0; + sdmac->period_len = period_len; + + sdmac->flags |= IMX_DMA_SG_LOOP; + sdmac->direction = direction; + ret = sdma_load_context(sdmac); + if (ret) + goto err_out; + + if (num_periods > NUM_BD) { + dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n", + channel, num_periods, NUM_BD); + goto err_out; + } + + if (period_len > 0xffff) { + dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n", + channel, period_len, 0xffff); + goto err_out; + } + + while (buf < buf_len) { + struct sdma_buffer_descriptor *bd = &sdmac->bd[i]; + int param; + + bd->buffer_addr = dma_addr; + + bd->mode.count = period_len; + + if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) + goto err_out; + if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES) + bd->mode.command = 0; + else + bd->mode.command = sdmac->word_size; + + param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR; + if (i + 1 == num_periods) + param |= BD_WRAP; + + dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n", + i, period_len, (u64)dma_addr, + param & BD_WRAP ? "wrap" : "", + param & BD_INTR ? " intr" : ""); + + bd->mode.status = param; + + dma_addr += period_len; + buf += period_len; + + i++; + } + + sdmac->num_bd = num_periods; + sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys; + + return &sdmac->desc; +err_out: + sdmac->status = DMA_ERROR; + return NULL; +} + +static int sdma_config(struct dma_chan *chan, + struct dma_slave_config *dmaengine_cfg) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + + if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { + sdmac->per_address = dmaengine_cfg->src_addr; + sdmac->watermark_level = dmaengine_cfg->src_maxburst * + dmaengine_cfg->src_addr_width; + sdmac->word_size = dmaengine_cfg->src_addr_width; + } else { + sdmac->per_address = dmaengine_cfg->dst_addr; + sdmac->watermark_level = dmaengine_cfg->dst_maxburst * + dmaengine_cfg->dst_addr_width; + sdmac->word_size = dmaengine_cfg->dst_addr_width; + } + sdmac->direction = dmaengine_cfg->direction; + return sdma_config_channel(chan); +} + +static enum dma_status sdma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + u32 residue; + + if (sdmac->flags & IMX_DMA_SG_LOOP) + residue = (sdmac->num_bd - sdmac->buf_tail) * sdmac->period_len; + else + residue = sdmac->chn_count - sdmac->chn_real_count; + + dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, + residue); + + return sdmac->status; +} + +static void sdma_issue_pending(struct dma_chan *chan) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct sdma_engine *sdma = sdmac->sdma; + + if (sdmac->status == DMA_IN_PROGRESS) + sdma_enable_channel(sdma, sdmac->channel); +} + +#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34 +#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38 +#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 41 + +static void sdma_add_scripts(struct sdma_engine *sdma, + const struct sdma_script_start_addrs *addr) +{ + s32 *addr_arr = (u32 *)addr; + s32 *saddr_arr = (u32 *)sdma->script_addrs; + int i; + + /* use the default firmware in ROM if missing external firmware */ + if (!sdma->script_number) + sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; + + for (i = 0; i < sdma->script_number; i++) + if (addr_arr[i] > 0) + saddr_arr[i] = addr_arr[i]; +} + +static void sdma_load_firmware(const struct firmware *fw, void *context) +{ + struct sdma_engine *sdma = context; + const struct sdma_firmware_header *header; + const struct sdma_script_start_addrs *addr; + unsigned short *ram_code; + + if (!fw) { + dev_info(sdma->dev, "external firmware not found, using ROM firmware\n"); + /* In this case we just use the ROM firmware. */ + return; + } + + if (fw->size < sizeof(*header)) + goto err_firmware; + + header = (struct sdma_firmware_header *)fw->data; + + if (header->magic != SDMA_FIRMWARE_MAGIC) + goto err_firmware; + if (header->ram_code_start + header->ram_code_size > fw->size) + goto err_firmware; + switch (header->version_major) { + case 1: + sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; + break; + case 2: + sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2; + break; + case 3: + sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3; + break; + default: + dev_err(sdma->dev, "unknown firmware version\n"); + goto err_firmware; + } + + addr = (void *)header + header->script_addrs_start; + ram_code = (void *)header + header->ram_code_start; + + clk_enable(sdma->clk_ipg); + clk_enable(sdma->clk_ahb); + /* download the RAM image for SDMA */ + sdma_load_script(sdma, ram_code, + header->ram_code_size, + addr->ram_code_start_addr); + clk_disable(sdma->clk_ipg); + clk_disable(sdma->clk_ahb); + + sdma_add_scripts(sdma, addr); + + dev_info(sdma->dev, "loaded firmware %d.%d\n", + header->version_major, + header->version_minor); + +err_firmware: + release_firmware(fw); +} + +static int sdma_get_firmware(struct sdma_engine *sdma, + const char *fw_name) +{ + int ret; + + ret = reject_firmware_nowait(THIS_MODULE, + FW_ACTION_HOTPLUG, fw_name, sdma->dev, + GFP_KERNEL, sdma, sdma_load_firmware); + + return ret; +} + +static int sdma_init(struct sdma_engine *sdma) +{ + int i, ret; + dma_addr_t ccb_phys; + + clk_enable(sdma->clk_ipg); + clk_enable(sdma->clk_ahb); + + /* Be sure SDMA has not started yet */ + writel_relaxed(0, sdma->regs + SDMA_H_C0PTR); + + sdma->channel_control = dma_alloc_coherent(NULL, + MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) + + sizeof(struct sdma_context_data), + &ccb_phys, GFP_KERNEL); + + if (!sdma->channel_control) { + ret = -ENOMEM; + goto err_dma_alloc; + } + + sdma->context = (void *)sdma->channel_control + + MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); + sdma->context_phys = ccb_phys + + MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control); + + /* Zero-out the CCB structures array just allocated */ + memset(sdma->channel_control, 0, + MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control)); + + /* disable all channels */ + for (i = 0; i < sdma->drvdata->num_events; i++) + writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i)); + + /* All channels have priority 0 */ + for (i = 0; i < MAX_DMA_CHANNELS; i++) + writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4); + + ret = sdma_request_channel(&sdma->channel[0]); + if (ret) + goto err_dma_alloc; + + sdma_config_ownership(&sdma->channel[0], false, true, false); + + /* Set Command Channel (Channel Zero) */ + writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR); + + /* Set bits of CONFIG register but with static context switching */ + /* FIXME: Check whether to set ACR bit depending on clock ratios */ + writel_relaxed(0, sdma->regs + SDMA_H_CONFIG); + + writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR); + + /* Initializes channel's priorities */ + sdma_set_channel_priority(&sdma->channel[0], 7); + + clk_disable(sdma->clk_ipg); + clk_disable(sdma->clk_ahb); + + return 0; + +err_dma_alloc: + clk_disable(sdma->clk_ipg); + clk_disable(sdma->clk_ahb); + dev_err(sdma->dev, "initialisation failed with %d\n", ret); + return ret; +} + +static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param) +{ + struct sdma_channel *sdmac = to_sdma_chan(chan); + struct imx_dma_data *data = fn_param; + + if (!imx_dma_is_general_purpose(chan)) + return false; + + sdmac->data = *data; + chan->private = &sdmac->data; + + return true; +} + +static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct sdma_engine *sdma = ofdma->of_dma_data; + dma_cap_mask_t mask = sdma->dma_device.cap_mask; + struct imx_dma_data data; + + if (dma_spec->args_count != 3) + return NULL; + + data.dma_request = dma_spec->args[0]; + data.peripheral_type = dma_spec->args[1]; + data.priority = dma_spec->args[2]; + + return dma_request_channel(mask, sdma_filter_fn, &data); +} + +static int sdma_probe(struct platform_device *pdev) +{ + const struct of_device_id *of_id = + of_match_device(sdma_dt_ids, &pdev->dev); + struct device_node *np = pdev->dev.of_node; + const char *fw_name; + int ret; + int irq; + struct resource *iores; + struct sdma_platform_data *pdata = dev_get_platdata(&pdev->dev); + int i; + struct sdma_engine *sdma; + s32 *saddr_arr; + const struct sdma_driver_data *drvdata = NULL; + + if (of_id) + drvdata = of_id->data; + else if (pdev->id_entry) + drvdata = (void *)pdev->id_entry->driver_data; + + if (!drvdata) { + dev_err(&pdev->dev, "unable to find driver data\n"); + return -EINVAL; + } + + ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + sdma = devm_kzalloc(&pdev->dev, sizeof(*sdma), GFP_KERNEL); + if (!sdma) + return -ENOMEM; + + spin_lock_init(&sdma->channel_0_lock); + + sdma->dev = &pdev->dev; + sdma->drvdata = drvdata; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + sdma->regs = devm_ioremap_resource(&pdev->dev, iores); + if (IS_ERR(sdma->regs)) + return PTR_ERR(sdma->regs); + + sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); + if (IS_ERR(sdma->clk_ipg)) + return PTR_ERR(sdma->clk_ipg); + + sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); + if (IS_ERR(sdma->clk_ahb)) + return PTR_ERR(sdma->clk_ahb); + + clk_prepare(sdma->clk_ipg); + clk_prepare(sdma->clk_ahb); + + ret = devm_request_irq(&pdev->dev, irq, sdma_int_handler, 0, "sdma", + sdma); + if (ret) + return ret; + + sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL); + if (!sdma->script_addrs) + return -ENOMEM; + + /* initially no scripts available */ + saddr_arr = (s32 *)sdma->script_addrs; + for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++) + saddr_arr[i] = -EINVAL; + + dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask); + dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask); + + INIT_LIST_HEAD(&sdma->dma_device.channels); + /* Initialize channel parameters */ + for (i = 0; i < MAX_DMA_CHANNELS; i++) { + struct sdma_channel *sdmac = &sdma->channel[i]; + + sdmac->sdma = sdma; + spin_lock_init(&sdmac->lock); + + sdmac->chan.device = &sdma->dma_device; + dma_cookie_init(&sdmac->chan); + sdmac->channel = i; + + tasklet_init(&sdmac->tasklet, sdma_tasklet, + (unsigned long) sdmac); + /* + * Add the channel to the DMAC list. Do not add channel 0 though + * because we need it internally in the SDMA driver. This also means + * that channel 0 in dmaengine counting matches sdma channel 1. + */ + if (i) + list_add_tail(&sdmac->chan.device_node, + &sdma->dma_device.channels); + } + + ret = sdma_init(sdma); + if (ret) + goto err_init; + + if (sdma->drvdata->script_addrs) + sdma_add_scripts(sdma, sdma->drvdata->script_addrs); + if (pdata && pdata->script_addrs) + sdma_add_scripts(sdma, pdata->script_addrs); + + if (pdata) { + ret = sdma_get_firmware(sdma, pdata->fw_name); + if (ret) + dev_warn(&pdev->dev, "failed to get firmware from platform data\n"); + } else { + /* + * Because that device tree does not encode ROM script address, + * the RAM script in firmware is mandatory for device tree + * probe, otherwise it fails. + */ + ret = of_property_read_string(np, "fsl,sdma-ram-script-name", + &fw_name); + if (ret) + dev_warn(&pdev->dev, "failed to get firmware name\n"); + else { + ret = sdma_get_firmware(sdma, fw_name); + if (ret) + dev_warn(&pdev->dev, "failed to get firmware from device tree\n"); + } + } + + sdma->dma_device.dev = &pdev->dev; + + sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources; + sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources; + sdma->dma_device.device_tx_status = sdma_tx_status; + sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg; + sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic; + sdma->dma_device.device_config = sdma_config; + sdma->dma_device.device_terminate_all = sdma_disable_channel; + sdma->dma_device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + sdma->dma_device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + sdma->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + sdma->dma_device.device_issue_pending = sdma_issue_pending; + sdma->dma_device.dev->dma_parms = &sdma->dma_parms; + dma_set_max_seg_size(sdma->dma_device.dev, 65535); + + platform_set_drvdata(pdev, sdma); + + ret = dma_async_device_register(&sdma->dma_device); + if (ret) { + dev_err(&pdev->dev, "unable to register\n"); + goto err_init; + } + + if (np) { + ret = of_dma_controller_register(np, sdma_xlate, sdma); + if (ret) { + dev_err(&pdev->dev, "failed to register controller\n"); + goto err_register; + } + } + + dev_info(sdma->dev, "initialized\n"); + + return 0; + +err_register: + dma_async_device_unregister(&sdma->dma_device); +err_init: + kfree(sdma->script_addrs); + return ret; +} + +static int sdma_remove(struct platform_device *pdev) +{ + struct sdma_engine *sdma = platform_get_drvdata(pdev); + int i; + + dma_async_device_unregister(&sdma->dma_device); + kfree(sdma->script_addrs); + /* Kill the tasklet */ + for (i = 0; i < MAX_DMA_CHANNELS; i++) { + struct sdma_channel *sdmac = &sdma->channel[i]; + + tasklet_kill(&sdmac->tasklet); + } + + platform_set_drvdata(pdev, NULL); + dev_info(&pdev->dev, "Removed...\n"); + return 0; +} + +static struct platform_driver sdma_driver = { + .driver = { + .name = "imx-sdma", + .of_match_table = sdma_dt_ids, + }, + .id_table = sdma_devtypes, + .remove = sdma_remove, + .probe = sdma_probe, +}; + +module_platform_driver(sdma_driver); + +MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>"); +MODULE_DESCRIPTION("i.MX SDMA driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/ioat/Makefile b/drivers/dma/ioat/Makefile new file mode 100644 index 000000000..0ff7270af --- /dev/null +++ b/drivers/dma/ioat/Makefile @@ -0,0 +1,2 @@ +obj-$(CONFIG_INTEL_IOATDMA) += ioatdma.o +ioatdma-y := pci.o dma.o dma_v2.o dma_v3.o dca.o diff --git a/drivers/dma/ioat/dca.c b/drivers/dma/ioat/dca.c new file mode 100644 index 000000000..ea1e107ae --- /dev/null +++ b/drivers/dma/ioat/dca.c @@ -0,0 +1,706 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2007 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/smp.h> +#include <linux/interrupt.h> +#include <linux/dca.h> + +/* either a kernel change is needed, or we need something like this in kernel */ +#ifndef CONFIG_SMP +#include <asm/smp.h> +#undef cpu_physical_id +#define cpu_physical_id(cpu) (cpuid_ebx(1) >> 24) +#endif + +#include "dma.h" +#include "registers.h" +#include "dma_v2.h" + +/* + * Bit 7 of a tag map entry is the "valid" bit, if it is set then bits 0:6 + * contain the bit number of the APIC ID to map into the DCA tag. If the valid + * bit is not set, then the value must be 0 or 1 and defines the bit in the tag. + */ +#define DCA_TAG_MAP_VALID 0x80 + +#define DCA3_TAG_MAP_BIT_TO_INV 0x80 +#define DCA3_TAG_MAP_BIT_TO_SEL 0x40 +#define DCA3_TAG_MAP_LITERAL_VAL 0x1 + +#define DCA_TAG_MAP_MASK 0xDF + +/* expected tag map bytes for I/OAT ver.2 */ +#define DCA2_TAG_MAP_BYTE0 0x80 +#define DCA2_TAG_MAP_BYTE1 0x0 +#define DCA2_TAG_MAP_BYTE2 0x81 +#define DCA2_TAG_MAP_BYTE3 0x82 +#define DCA2_TAG_MAP_BYTE4 0x82 + +/* verify if tag map matches expected values */ +static inline int dca2_tag_map_valid(u8 *tag_map) +{ + return ((tag_map[0] == DCA2_TAG_MAP_BYTE0) && + (tag_map[1] == DCA2_TAG_MAP_BYTE1) && + (tag_map[2] == DCA2_TAG_MAP_BYTE2) && + (tag_map[3] == DCA2_TAG_MAP_BYTE3) && + (tag_map[4] == DCA2_TAG_MAP_BYTE4)); +} + +/* + * "Legacy" DCA systems do not implement the DCA register set in the + * I/OAT device. Software needs direct support for their tag mappings. + */ + +#define APICID_BIT(x) (DCA_TAG_MAP_VALID | (x)) +#define IOAT_TAG_MAP_LEN 8 + +static u8 ioat_tag_map_BNB[IOAT_TAG_MAP_LEN] = { + 1, APICID_BIT(1), APICID_BIT(2), APICID_BIT(2), }; +static u8 ioat_tag_map_SCNB[IOAT_TAG_MAP_LEN] = { + 1, APICID_BIT(1), APICID_BIT(2), APICID_BIT(2), }; +static u8 ioat_tag_map_CNB[IOAT_TAG_MAP_LEN] = { + 1, APICID_BIT(1), APICID_BIT(3), APICID_BIT(4), APICID_BIT(2), }; +static u8 ioat_tag_map_UNISYS[IOAT_TAG_MAP_LEN] = { 0 }; + +/* pack PCI B/D/F into a u16 */ +static inline u16 dcaid_from_pcidev(struct pci_dev *pci) +{ + return (pci->bus->number << 8) | pci->devfn; +} + +static int dca_enabled_in_bios(struct pci_dev *pdev) +{ + /* CPUID level 9 returns DCA configuration */ + /* Bit 0 indicates DCA enabled by the BIOS */ + unsigned long cpuid_level_9; + int res; + + cpuid_level_9 = cpuid_eax(9); + res = test_bit(0, &cpuid_level_9); + if (!res) + dev_dbg(&pdev->dev, "DCA is disabled in BIOS\n"); + + return res; +} + +int system_has_dca_enabled(struct pci_dev *pdev) +{ + if (boot_cpu_has(X86_FEATURE_DCA)) + return dca_enabled_in_bios(pdev); + + dev_dbg(&pdev->dev, "boot cpu doesn't have X86_FEATURE_DCA\n"); + return 0; +} + +struct ioat_dca_slot { + struct pci_dev *pdev; /* requester device */ + u16 rid; /* requester id, as used by IOAT */ +}; + +#define IOAT_DCA_MAX_REQ 6 +#define IOAT3_DCA_MAX_REQ 2 + +struct ioat_dca_priv { + void __iomem *iobase; + void __iomem *dca_base; + int max_requesters; + int requester_count; + u8 tag_map[IOAT_TAG_MAP_LEN]; + struct ioat_dca_slot req_slots[0]; +}; + +/* 5000 series chipset DCA Port Requester ID Table Entry Format + * [15:8] PCI-Express Bus Number + * [7:3] PCI-Express Device Number + * [2:0] PCI-Express Function Number + * + * 5000 series chipset DCA control register format + * [7:1] Reserved (0) + * [0] Ignore Function Number + */ + +static int ioat_dca_add_requester(struct dca_provider *dca, struct device *dev) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + struct pci_dev *pdev; + int i; + u16 id; + + /* This implementation only supports PCI-Express */ + if (!dev_is_pci(dev)) + return -ENODEV; + pdev = to_pci_dev(dev); + id = dcaid_from_pcidev(pdev); + + if (ioatdca->requester_count == ioatdca->max_requesters) + return -ENODEV; + + for (i = 0; i < ioatdca->max_requesters; i++) { + if (ioatdca->req_slots[i].pdev == NULL) { + /* found an empty slot */ + ioatdca->requester_count++; + ioatdca->req_slots[i].pdev = pdev; + ioatdca->req_slots[i].rid = id; + writew(id, ioatdca->dca_base + (i * 4)); + /* make sure the ignore function bit is off */ + writeb(0, ioatdca->dca_base + (i * 4) + 2); + return i; + } + } + /* Error, ioatdma->requester_count is out of whack */ + return -EFAULT; +} + +static int ioat_dca_remove_requester(struct dca_provider *dca, + struct device *dev) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + struct pci_dev *pdev; + int i; + + /* This implementation only supports PCI-Express */ + if (!dev_is_pci(dev)) + return -ENODEV; + pdev = to_pci_dev(dev); + + for (i = 0; i < ioatdca->max_requesters; i++) { + if (ioatdca->req_slots[i].pdev == pdev) { + writew(0, ioatdca->dca_base + (i * 4)); + ioatdca->req_slots[i].pdev = NULL; + ioatdca->req_slots[i].rid = 0; + ioatdca->requester_count--; + return i; + } + } + return -ENODEV; +} + +static u8 ioat_dca_get_tag(struct dca_provider *dca, + struct device *dev, + int cpu) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + int i, apic_id, bit, value; + u8 entry, tag; + + tag = 0; + apic_id = cpu_physical_id(cpu); + + for (i = 0; i < IOAT_TAG_MAP_LEN; i++) { + entry = ioatdca->tag_map[i]; + if (entry & DCA_TAG_MAP_VALID) { + bit = entry & ~DCA_TAG_MAP_VALID; + value = (apic_id & (1 << bit)) ? 1 : 0; + } else { + value = entry ? 1 : 0; + } + tag |= (value << i); + } + return tag; +} + +static int ioat_dca_dev_managed(struct dca_provider *dca, + struct device *dev) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + struct pci_dev *pdev; + int i; + + pdev = to_pci_dev(dev); + for (i = 0; i < ioatdca->max_requesters; i++) { + if (ioatdca->req_slots[i].pdev == pdev) + return 1; + } + return 0; +} + +static struct dca_ops ioat_dca_ops = { + .add_requester = ioat_dca_add_requester, + .remove_requester = ioat_dca_remove_requester, + .get_tag = ioat_dca_get_tag, + .dev_managed = ioat_dca_dev_managed, +}; + + +struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase) +{ + struct dca_provider *dca; + struct ioat_dca_priv *ioatdca; + u8 *tag_map = NULL; + int i; + int err; + u8 version; + u8 max_requesters; + + if (!system_has_dca_enabled(pdev)) + return NULL; + + /* I/OAT v1 systems must have a known tag_map to support DCA */ + switch (pdev->vendor) { + case PCI_VENDOR_ID_INTEL: + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_IOAT: + tag_map = ioat_tag_map_BNB; + break; + case PCI_DEVICE_ID_INTEL_IOAT_CNB: + tag_map = ioat_tag_map_CNB; + break; + case PCI_DEVICE_ID_INTEL_IOAT_SCNB: + tag_map = ioat_tag_map_SCNB; + break; + } + break; + case PCI_VENDOR_ID_UNISYS: + switch (pdev->device) { + case PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR: + tag_map = ioat_tag_map_UNISYS; + break; + } + break; + } + if (tag_map == NULL) + return NULL; + + version = readb(iobase + IOAT_VER_OFFSET); + if (version == IOAT_VER_3_0) + max_requesters = IOAT3_DCA_MAX_REQ; + else + max_requesters = IOAT_DCA_MAX_REQ; + + dca = alloc_dca_provider(&ioat_dca_ops, + sizeof(*ioatdca) + + (sizeof(struct ioat_dca_slot) * max_requesters)); + if (!dca) + return NULL; + + ioatdca = dca_priv(dca); + ioatdca->max_requesters = max_requesters; + ioatdca->dca_base = iobase + 0x54; + + /* copy over the APIC ID to DCA tag mapping */ + for (i = 0; i < IOAT_TAG_MAP_LEN; i++) + ioatdca->tag_map[i] = tag_map[i]; + + err = register_dca_provider(dca, &pdev->dev); + if (err) { + free_dca_provider(dca); + return NULL; + } + + return dca; +} + + +static int ioat2_dca_add_requester(struct dca_provider *dca, struct device *dev) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + struct pci_dev *pdev; + int i; + u16 id; + u16 global_req_table; + + /* This implementation only supports PCI-Express */ + if (!dev_is_pci(dev)) + return -ENODEV; + pdev = to_pci_dev(dev); + id = dcaid_from_pcidev(pdev); + + if (ioatdca->requester_count == ioatdca->max_requesters) + return -ENODEV; + + for (i = 0; i < ioatdca->max_requesters; i++) { + if (ioatdca->req_slots[i].pdev == NULL) { + /* found an empty slot */ + ioatdca->requester_count++; + ioatdca->req_slots[i].pdev = pdev; + ioatdca->req_slots[i].rid = id; + global_req_table = + readw(ioatdca->dca_base + IOAT_DCA_GREQID_OFFSET); + writel(id | IOAT_DCA_GREQID_VALID, + ioatdca->iobase + global_req_table + (i * 4)); + return i; + } + } + /* Error, ioatdma->requester_count is out of whack */ + return -EFAULT; +} + +static int ioat2_dca_remove_requester(struct dca_provider *dca, + struct device *dev) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + struct pci_dev *pdev; + int i; + u16 global_req_table; + + /* This implementation only supports PCI-Express */ + if (!dev_is_pci(dev)) + return -ENODEV; + pdev = to_pci_dev(dev); + + for (i = 0; i < ioatdca->max_requesters; i++) { + if (ioatdca->req_slots[i].pdev == pdev) { + global_req_table = + readw(ioatdca->dca_base + IOAT_DCA_GREQID_OFFSET); + writel(0, ioatdca->iobase + global_req_table + (i * 4)); + ioatdca->req_slots[i].pdev = NULL; + ioatdca->req_slots[i].rid = 0; + ioatdca->requester_count--; + return i; + } + } + return -ENODEV; +} + +static u8 ioat2_dca_get_tag(struct dca_provider *dca, + struct device *dev, + int cpu) +{ + u8 tag; + + tag = ioat_dca_get_tag(dca, dev, cpu); + tag = (~tag) & 0x1F; + return tag; +} + +static struct dca_ops ioat2_dca_ops = { + .add_requester = ioat2_dca_add_requester, + .remove_requester = ioat2_dca_remove_requester, + .get_tag = ioat2_dca_get_tag, + .dev_managed = ioat_dca_dev_managed, +}; + +static int ioat2_dca_count_dca_slots(void __iomem *iobase, u16 dca_offset) +{ + int slots = 0; + u32 req; + u16 global_req_table; + + global_req_table = readw(iobase + dca_offset + IOAT_DCA_GREQID_OFFSET); + if (global_req_table == 0) + return 0; + do { + req = readl(iobase + global_req_table + (slots * sizeof(u32))); + slots++; + } while ((req & IOAT_DCA_GREQID_LASTID) == 0); + + return slots; +} + +struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase) +{ + struct dca_provider *dca; + struct ioat_dca_priv *ioatdca; + int slots; + int i; + int err; + u32 tag_map; + u16 dca_offset; + u16 csi_fsb_control; + u16 pcie_control; + u8 bit; + + if (!system_has_dca_enabled(pdev)) + return NULL; + + dca_offset = readw(iobase + IOAT_DCAOFFSET_OFFSET); + if (dca_offset == 0) + return NULL; + + slots = ioat2_dca_count_dca_slots(iobase, dca_offset); + if (slots == 0) + return NULL; + + dca = alloc_dca_provider(&ioat2_dca_ops, + sizeof(*ioatdca) + + (sizeof(struct ioat_dca_slot) * slots)); + if (!dca) + return NULL; + + ioatdca = dca_priv(dca); + ioatdca->iobase = iobase; + ioatdca->dca_base = iobase + dca_offset; + ioatdca->max_requesters = slots; + + /* some bios might not know to turn these on */ + csi_fsb_control = readw(ioatdca->dca_base + IOAT_FSB_CAP_ENABLE_OFFSET); + if ((csi_fsb_control & IOAT_FSB_CAP_ENABLE_PREFETCH) == 0) { + csi_fsb_control |= IOAT_FSB_CAP_ENABLE_PREFETCH; + writew(csi_fsb_control, + ioatdca->dca_base + IOAT_FSB_CAP_ENABLE_OFFSET); + } + pcie_control = readw(ioatdca->dca_base + IOAT_PCI_CAP_ENABLE_OFFSET); + if ((pcie_control & IOAT_PCI_CAP_ENABLE_MEMWR) == 0) { + pcie_control |= IOAT_PCI_CAP_ENABLE_MEMWR; + writew(pcie_control, + ioatdca->dca_base + IOAT_PCI_CAP_ENABLE_OFFSET); + } + + + /* TODO version, compatibility and configuration checks */ + + /* copy out the APIC to DCA tag map */ + tag_map = readl(ioatdca->dca_base + IOAT_APICID_TAG_MAP_OFFSET); + for (i = 0; i < 5; i++) { + bit = (tag_map >> (4 * i)) & 0x0f; + if (bit < 8) + ioatdca->tag_map[i] = bit | DCA_TAG_MAP_VALID; + else + ioatdca->tag_map[i] = 0; + } + + if (!dca2_tag_map_valid(ioatdca->tag_map)) { + WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND, + "%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n", + dev_driver_string(&pdev->dev), + dev_name(&pdev->dev)); + free_dca_provider(dca); + return NULL; + } + + err = register_dca_provider(dca, &pdev->dev); + if (err) { + free_dca_provider(dca); + return NULL; + } + + return dca; +} + +static int ioat3_dca_add_requester(struct dca_provider *dca, struct device *dev) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + struct pci_dev *pdev; + int i; + u16 id; + u16 global_req_table; + + /* This implementation only supports PCI-Express */ + if (!dev_is_pci(dev)) + return -ENODEV; + pdev = to_pci_dev(dev); + id = dcaid_from_pcidev(pdev); + + if (ioatdca->requester_count == ioatdca->max_requesters) + return -ENODEV; + + for (i = 0; i < ioatdca->max_requesters; i++) { + if (ioatdca->req_slots[i].pdev == NULL) { + /* found an empty slot */ + ioatdca->requester_count++; + ioatdca->req_slots[i].pdev = pdev; + ioatdca->req_slots[i].rid = id; + global_req_table = + readw(ioatdca->dca_base + IOAT3_DCA_GREQID_OFFSET); + writel(id | IOAT_DCA_GREQID_VALID, + ioatdca->iobase + global_req_table + (i * 4)); + return i; + } + } + /* Error, ioatdma->requester_count is out of whack */ + return -EFAULT; +} + +static int ioat3_dca_remove_requester(struct dca_provider *dca, + struct device *dev) +{ + struct ioat_dca_priv *ioatdca = dca_priv(dca); + struct pci_dev *pdev; + int i; + u16 global_req_table; + + /* This implementation only supports PCI-Express */ + if (!dev_is_pci(dev)) + return -ENODEV; + pdev = to_pci_dev(dev); + + for (i = 0; i < ioatdca->max_requesters; i++) { + if (ioatdca->req_slots[i].pdev == pdev) { + global_req_table = + readw(ioatdca->dca_base + IOAT3_DCA_GREQID_OFFSET); + writel(0, ioatdca->iobase + global_req_table + (i * 4)); + ioatdca->req_slots[i].pdev = NULL; + ioatdca->req_slots[i].rid = 0; + ioatdca->requester_count--; + return i; + } + } + return -ENODEV; +} + +static u8 ioat3_dca_get_tag(struct dca_provider *dca, + struct device *dev, + int cpu) +{ + u8 tag; + + struct ioat_dca_priv *ioatdca = dca_priv(dca); + int i, apic_id, bit, value; + u8 entry; + + tag = 0; + apic_id = cpu_physical_id(cpu); + + for (i = 0; i < IOAT_TAG_MAP_LEN; i++) { + entry = ioatdca->tag_map[i]; + if (entry & DCA3_TAG_MAP_BIT_TO_SEL) { + bit = entry & + ~(DCA3_TAG_MAP_BIT_TO_SEL | DCA3_TAG_MAP_BIT_TO_INV); + value = (apic_id & (1 << bit)) ? 1 : 0; + } else if (entry & DCA3_TAG_MAP_BIT_TO_INV) { + bit = entry & ~DCA3_TAG_MAP_BIT_TO_INV; + value = (apic_id & (1 << bit)) ? 0 : 1; + } else { + value = (entry & DCA3_TAG_MAP_LITERAL_VAL) ? 1 : 0; + } + tag |= (value << i); + } + + return tag; +} + +static struct dca_ops ioat3_dca_ops = { + .add_requester = ioat3_dca_add_requester, + .remove_requester = ioat3_dca_remove_requester, + .get_tag = ioat3_dca_get_tag, + .dev_managed = ioat_dca_dev_managed, +}; + +static int ioat3_dca_count_dca_slots(void *iobase, u16 dca_offset) +{ + int slots = 0; + u32 req; + u16 global_req_table; + + global_req_table = readw(iobase + dca_offset + IOAT3_DCA_GREQID_OFFSET); + if (global_req_table == 0) + return 0; + + do { + req = readl(iobase + global_req_table + (slots * sizeof(u32))); + slots++; + } while ((req & IOAT_DCA_GREQID_LASTID) == 0); + + return slots; +} + +static inline int dca3_tag_map_invalid(u8 *tag_map) +{ + /* + * If the tag map is not programmed by the BIOS the default is: + * 0x80 0x80 0x80 0x80 0x80 0x00 0x00 0x00 + * + * This an invalid map and will result in only 2 possible tags + * 0x1F and 0x00. 0x00 is an invalid DCA tag so we know that + * this entire definition is invalid. + */ + return ((tag_map[0] == DCA_TAG_MAP_VALID) && + (tag_map[1] == DCA_TAG_MAP_VALID) && + (tag_map[2] == DCA_TAG_MAP_VALID) && + (tag_map[3] == DCA_TAG_MAP_VALID) && + (tag_map[4] == DCA_TAG_MAP_VALID)); +} + +struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase) +{ + struct dca_provider *dca; + struct ioat_dca_priv *ioatdca; + int slots; + int i; + int err; + u16 dca_offset; + u16 csi_fsb_control; + u16 pcie_control; + u8 bit; + + union { + u64 full; + struct { + u32 low; + u32 high; + }; + } tag_map; + + if (!system_has_dca_enabled(pdev)) + return NULL; + + dca_offset = readw(iobase + IOAT_DCAOFFSET_OFFSET); + if (dca_offset == 0) + return NULL; + + slots = ioat3_dca_count_dca_slots(iobase, dca_offset); + if (slots == 0) + return NULL; + + dca = alloc_dca_provider(&ioat3_dca_ops, + sizeof(*ioatdca) + + (sizeof(struct ioat_dca_slot) * slots)); + if (!dca) + return NULL; + + ioatdca = dca_priv(dca); + ioatdca->iobase = iobase; + ioatdca->dca_base = iobase + dca_offset; + ioatdca->max_requesters = slots; + + /* some bios might not know to turn these on */ + csi_fsb_control = readw(ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET); + if ((csi_fsb_control & IOAT3_CSI_CONTROL_PREFETCH) == 0) { + csi_fsb_control |= IOAT3_CSI_CONTROL_PREFETCH; + writew(csi_fsb_control, + ioatdca->dca_base + IOAT3_CSI_CONTROL_OFFSET); + } + pcie_control = readw(ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET); + if ((pcie_control & IOAT3_PCI_CONTROL_MEMWR) == 0) { + pcie_control |= IOAT3_PCI_CONTROL_MEMWR; + writew(pcie_control, + ioatdca->dca_base + IOAT3_PCI_CONTROL_OFFSET); + } + + + /* TODO version, compatibility and configuration checks */ + + /* copy out the APIC to DCA tag map */ + tag_map.low = + readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_LOW); + tag_map.high = + readl(ioatdca->dca_base + IOAT3_APICID_TAG_MAP_OFFSET_HIGH); + for (i = 0; i < 8; i++) { + bit = tag_map.full >> (8 * i); + ioatdca->tag_map[i] = bit & DCA_TAG_MAP_MASK; + } + + if (dca3_tag_map_invalid(ioatdca->tag_map)) { + WARN_TAINT_ONCE(1, TAINT_FIRMWARE_WORKAROUND, + "%s %s: APICID_TAG_MAP set incorrectly by BIOS, disabling DCA\n", + dev_driver_string(&pdev->dev), + dev_name(&pdev->dev)); + free_dca_provider(dca); + return NULL; + } + + err = register_dca_provider(dca, &pdev->dev); + if (err) { + free_dca_provider(dca); + return NULL; + } + + return dca; +} diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c new file mode 100644 index 000000000..ee0aa9f4c --- /dev/null +++ b/drivers/dma/ioat/dma.c @@ -0,0 +1,1246 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2004 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine, which does asynchronous + * copy operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/workqueue.h> +#include <linux/prefetch.h> +#include <linux/i7300_idle.h> +#include "dma.h" +#include "registers.h" +#include "hw.h" + +#include "../dmaengine.h" + +int ioat_pending_level = 4; +module_param(ioat_pending_level, int, 0644); +MODULE_PARM_DESC(ioat_pending_level, + "high-water mark for pushing ioat descriptors (default: 4)"); + +/* internal functions */ +static void ioat1_cleanup(struct ioat_dma_chan *ioat); +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat); + +/** + * ioat_dma_do_interrupt - handler used for single vector interrupt mode + * @irq: interrupt id + * @data: interrupt data + */ +static irqreturn_t ioat_dma_do_interrupt(int irq, void *data) +{ + struct ioatdma_device *instance = data; + struct ioat_chan_common *chan; + unsigned long attnstatus; + int bit; + u8 intrctrl; + + intrctrl = readb(instance->reg_base + IOAT_INTRCTRL_OFFSET); + + if (!(intrctrl & IOAT_INTRCTRL_MASTER_INT_EN)) + return IRQ_NONE; + + if (!(intrctrl & IOAT_INTRCTRL_INT_STATUS)) { + writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); + return IRQ_NONE; + } + + attnstatus = readl(instance->reg_base + IOAT_ATTNSTATUS_OFFSET); + for_each_set_bit(bit, &attnstatus, BITS_PER_LONG) { + chan = ioat_chan_by_index(instance, bit); + if (test_bit(IOAT_RUN, &chan->state)) + tasklet_schedule(&chan->cleanup_task); + } + + writeb(intrctrl, instance->reg_base + IOAT_INTRCTRL_OFFSET); + return IRQ_HANDLED; +} + +/** + * ioat_dma_do_interrupt_msix - handler used for vector-per-channel interrupt mode + * @irq: interrupt id + * @data: interrupt data + */ +static irqreturn_t ioat_dma_do_interrupt_msix(int irq, void *data) +{ + struct ioat_chan_common *chan = data; + + if (test_bit(IOAT_RUN, &chan->state)) + tasklet_schedule(&chan->cleanup_task); + + return IRQ_HANDLED; +} + +/* common channel initialization */ +void ioat_init_channel(struct ioatdma_device *device, struct ioat_chan_common *chan, int idx) +{ + struct dma_device *dma = &device->common; + struct dma_chan *c = &chan->common; + unsigned long data = (unsigned long) c; + + chan->device = device; + chan->reg_base = device->reg_base + (0x80 * (idx + 1)); + spin_lock_init(&chan->cleanup_lock); + chan->common.device = dma; + dma_cookie_init(&chan->common); + list_add_tail(&chan->common.device_node, &dma->channels); + device->idx[idx] = chan; + init_timer(&chan->timer); + chan->timer.function = device->timer_fn; + chan->timer.data = data; + tasklet_init(&chan->cleanup_task, device->cleanup_fn, data); +} + +/** + * ioat1_dma_enumerate_channels - find and initialize the device's channels + * @device: the device to be enumerated + */ +static int ioat1_enumerate_channels(struct ioatdma_device *device) +{ + u8 xfercap_scale; + u32 xfercap; + int i; + struct ioat_dma_chan *ioat; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + + INIT_LIST_HEAD(&dma->channels); + dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + dma->chancnt &= 0x1f; /* bits [4:0] valid */ + if (dma->chancnt > ARRAY_SIZE(device->idx)) { + dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", + dma->chancnt, ARRAY_SIZE(device->idx)); + dma->chancnt = ARRAY_SIZE(device->idx); + } + xfercap_scale = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + xfercap_scale &= 0x1f; /* bits [4:0] valid */ + xfercap = (xfercap_scale == 0 ? -1 : (1UL << xfercap_scale)); + dev_dbg(dev, "%s: xfercap = %d\n", __func__, xfercap); + +#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL + if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) + dma->chancnt--; +#endif + for (i = 0; i < dma->chancnt; i++) { + ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); + if (!ioat) + break; + + ioat_init_channel(device, &ioat->base, i); + ioat->xfercap = xfercap; + spin_lock_init(&ioat->desc_lock); + INIT_LIST_HEAD(&ioat->free_desc); + INIT_LIST_HEAD(&ioat->used_desc); + } + dma->chancnt = i; + return i; +} + +/** + * ioat_dma_memcpy_issue_pending - push potentially unrecognized appended + * descriptors to hw + * @chan: DMA channel handle + */ +static inline void +__ioat1_dma_memcpy_issue_pending(struct ioat_dma_chan *ioat) +{ + void __iomem *reg_base = ioat->base.reg_base; + + dev_dbg(to_dev(&ioat->base), "%s: pending: %d\n", + __func__, ioat->pending); + ioat->pending = 0; + writeb(IOAT_CHANCMD_APPEND, reg_base + IOAT1_CHANCMD_OFFSET); +} + +static void ioat1_dma_memcpy_issue_pending(struct dma_chan *chan) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(chan); + + if (ioat->pending > 0) { + spin_lock_bh(&ioat->desc_lock); + __ioat1_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); + } +} + +/** + * ioat1_reset_channel - restart a channel + * @ioat: IOAT DMA channel handle + */ +static void ioat1_reset_channel(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + void __iomem *reg_base = chan->reg_base; + u32 chansts, chanerr; + + dev_warn(to_dev(chan), "reset\n"); + chanerr = readl(reg_base + IOAT_CHANERR_OFFSET); + chansts = *chan->completion & IOAT_CHANSTS_STATUS; + if (chanerr) { + dev_err(to_dev(chan), + "chan%d, CHANSTS = 0x%08x CHANERR = 0x%04x, clearing\n", + chan_num(chan), chansts, chanerr); + writel(chanerr, reg_base + IOAT_CHANERR_OFFSET); + } + + /* + * whack it upside the head with a reset + * and wait for things to settle out. + * force the pending count to a really big negative + * to make sure no one forces an issue_pending + * while we're waiting. + */ + + ioat->pending = INT_MIN; + writeb(IOAT_CHANCMD_RESET, + reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + set_bit(IOAT_RESET_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + RESET_DELAY); +} + +static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct dma_chan *c = tx->chan; + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_desc_sw *desc = tx_to_ioat_desc(tx); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_desc_sw *first; + struct ioat_desc_sw *chain_tail; + dma_cookie_t cookie; + + spin_lock_bh(&ioat->desc_lock); + /* cookie incr and addition to used_list must be atomic */ + cookie = dma_cookie_assign(tx); + dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); + + /* write address into NextDescriptor field of last desc in chain */ + first = to_ioat_desc(desc->tx_list.next); + chain_tail = to_ioat_desc(ioat->used_desc.prev); + /* make descriptor updates globally visible before chaining */ + wmb(); + chain_tail->hw->next = first->txd.phys; + list_splice_tail_init(&desc->tx_list, &ioat->used_desc); + dump_desc_dbg(ioat, chain_tail); + dump_desc_dbg(ioat, first); + + if (!test_and_set_bit(IOAT_COMPLETION_PENDING, &chan->state)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + ioat->active += desc->hw->tx_cnt; + ioat->pending += desc->hw->tx_cnt; + if (ioat->pending >= ioat_pending_level) + __ioat1_dma_memcpy_issue_pending(ioat); + spin_unlock_bh(&ioat->desc_lock); + + return cookie; +} + +/** + * ioat_dma_alloc_descriptor - allocate and return a sw and hw descriptor pair + * @ioat: the channel supplying the memory pool for the descriptors + * @flags: allocation flags + */ +static struct ioat_desc_sw * +ioat_dma_alloc_descriptor(struct ioat_dma_chan *ioat, gfp_t flags) +{ + struct ioat_dma_descriptor *desc; + struct ioat_desc_sw *desc_sw; + struct ioatdma_device *ioatdma_device; + dma_addr_t phys; + + ioatdma_device = ioat->base.device; + desc = pci_pool_alloc(ioatdma_device->dma_pool, flags, &phys); + if (unlikely(!desc)) + return NULL; + + desc_sw = kzalloc(sizeof(*desc_sw), flags); + if (unlikely(!desc_sw)) { + pci_pool_free(ioatdma_device->dma_pool, desc, phys); + return NULL; + } + + memset(desc, 0, sizeof(*desc)); + + INIT_LIST_HEAD(&desc_sw->tx_list); + dma_async_tx_descriptor_init(&desc_sw->txd, &ioat->base.common); + desc_sw->txd.tx_submit = ioat1_tx_submit; + desc_sw->hw = desc; + desc_sw->txd.phys = phys; + set_desc_id(desc_sw, -1); + + return desc_sw; +} + +static int ioat_initial_desc_count = 256; +module_param(ioat_initial_desc_count, int, 0644); +MODULE_PARM_DESC(ioat_initial_desc_count, + "ioat1: initial descriptors per channel (default: 256)"); +/** + * ioat1_dma_alloc_chan_resources - returns the number of allocated descriptors + * @chan: the channel to be filled out + */ +static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_desc_sw *desc; + u32 chanerr; + int i; + LIST_HEAD(tmp_list); + + /* have we already been set up? */ + if (!list_empty(&ioat->free_desc)) + return ioat->desccount; + + /* Setup register to interrupt and write completion status on error */ + writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + if (chanerr) { + dev_err(to_dev(chan), "CHANERR = %x, clearing\n", chanerr); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + } + + /* Allocate descriptors */ + for (i = 0; i < ioat_initial_desc_count; i++) { + desc = ioat_dma_alloc_descriptor(ioat, GFP_KERNEL); + if (!desc) { + dev_err(to_dev(chan), "Only %d initial descriptors\n", i); + break; + } + set_desc_id(desc, i); + list_add_tail(&desc->node, &tmp_list); + } + spin_lock_bh(&ioat->desc_lock); + ioat->desccount = i; + list_splice(&tmp_list, &ioat->free_desc); + spin_unlock_bh(&ioat->desc_lock); + + /* allocate a completion writeback area */ + /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ + chan->completion = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, &chan->completion_dma); + memset(chan->completion, 0, sizeof(*chan->completion)); + writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); + writel(((u64) chan->completion_dma) >> 32, + chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); + + set_bit(IOAT_RUN, &chan->state); + ioat1_dma_start_null_desc(ioat); /* give chain to dma device */ + dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", + __func__, ioat->desccount); + return ioat->desccount; +} + +void ioat_stop(struct ioat_chan_common *chan) +{ + struct ioatdma_device *device = chan->device; + struct pci_dev *pdev = device->pdev; + int chan_id = chan_num(chan); + struct msix_entry *msix; + + /* 1/ stop irq from firing tasklets + * 2/ stop the tasklet from re-arming irqs + */ + clear_bit(IOAT_RUN, &chan->state); + + /* flush inflight interrupts */ + switch (device->irq_mode) { + case IOAT_MSIX: + msix = &device->msix_entries[chan_id]; + synchronize_irq(msix->vector); + break; + case IOAT_MSI: + case IOAT_INTX: + synchronize_irq(pdev->irq); + break; + default: + break; + } + + /* flush inflight timers */ + del_timer_sync(&chan->timer); + + /* flush inflight tasklet runs */ + tasklet_kill(&chan->cleanup_task); + + /* final cleanup now that everything is quiesced and can't re-arm */ + device->cleanup_fn((unsigned long) &chan->common); +} + +/** + * ioat1_dma_free_chan_resources - release all the descriptors + * @chan: the channel to be cleaned + */ +static void ioat1_dma_free_chan_resources(struct dma_chan *c) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *ioatdma_device = chan->device; + struct ioat_desc_sw *desc, *_desc; + int in_use_descs = 0; + + /* Before freeing channel resources first check + * if they have been previously allocated for this channel. + */ + if (ioat->desccount == 0) + return; + + ioat_stop(chan); + + /* Delay 100ms after reset to allow internal DMA logic to quiesce + * before removing DMA descriptor resources. + */ + writeb(IOAT_CHANCMD_RESET, + chan->reg_base + IOAT_CHANCMD_OFFSET(chan->device->version)); + mdelay(100); + + spin_lock_bh(&ioat->desc_lock); + list_for_each_entry_safe(desc, _desc, &ioat->used_desc, node) { + dev_dbg(to_dev(chan), "%s: freeing %d from used list\n", + __func__, desc_id(desc)); + dump_desc_dbg(ioat, desc); + in_use_descs++; + list_del(&desc->node); + pci_pool_free(ioatdma_device->dma_pool, desc->hw, + desc->txd.phys); + kfree(desc); + } + list_for_each_entry_safe(desc, _desc, + &ioat->free_desc, node) { + list_del(&desc->node); + pci_pool_free(ioatdma_device->dma_pool, desc->hw, + desc->txd.phys); + kfree(desc); + } + spin_unlock_bh(&ioat->desc_lock); + + pci_pool_free(ioatdma_device->completion_pool, + chan->completion, + chan->completion_dma); + + /* one is ok since we left it on there on purpose */ + if (in_use_descs > 1) + dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", + in_use_descs - 1); + + chan->last_completion = 0; + chan->completion_dma = 0; + ioat->pending = 0; + ioat->desccount = 0; +} + +/** + * ioat1_dma_get_next_descriptor - return the next available descriptor + * @ioat: IOAT DMA channel handle + * + * Gets the next descriptor from the chain, and must be called with the + * channel's desc_lock held. Allocates more descriptors if the channel + * has run out. + */ +static struct ioat_desc_sw * +ioat1_dma_get_next_descriptor(struct ioat_dma_chan *ioat) +{ + struct ioat_desc_sw *new; + + if (!list_empty(&ioat->free_desc)) { + new = to_ioat_desc(ioat->free_desc.next); + list_del(&new->node); + } else { + /* try to get another desc */ + new = ioat_dma_alloc_descriptor(ioat, GFP_ATOMIC); + if (!new) { + dev_err(to_dev(&ioat->base), "alloc failed\n"); + return NULL; + } + } + dev_dbg(to_dev(&ioat->base), "%s: allocated: %d\n", + __func__, desc_id(new)); + prefetch(new->hw); + return new; +} + +static struct dma_async_tx_descriptor * +ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + struct ioat_desc_sw *desc; + size_t copy; + LIST_HEAD(chain); + dma_addr_t src = dma_src; + dma_addr_t dest = dma_dest; + size_t total_len = len; + struct ioat_dma_descriptor *hw = NULL; + int tx_cnt = 0; + + spin_lock_bh(&ioat->desc_lock); + desc = ioat1_dma_get_next_descriptor(ioat); + do { + if (!desc) + break; + + tx_cnt++; + copy = min_t(size_t, len, ioat->xfercap); + + hw = desc->hw; + hw->size = copy; + hw->ctl = 0; + hw->src_addr = src; + hw->dst_addr = dest; + + list_add_tail(&desc->node, &chain); + + len -= copy; + dest += copy; + src += copy; + if (len) { + struct ioat_desc_sw *next; + + async_tx_ack(&desc->txd); + next = ioat1_dma_get_next_descriptor(ioat); + hw->next = next ? next->txd.phys : 0; + dump_desc_dbg(ioat, desc); + desc = next; + } else + hw->next = 0; + } while (len); + + if (!desc) { + struct ioat_chan_common *chan = &ioat->base; + + dev_err(to_dev(chan), + "chan%d - get_next_desc failed\n", chan_num(chan)); + list_splice(&chain, &ioat->free_desc); + spin_unlock_bh(&ioat->desc_lock); + return NULL; + } + spin_unlock_bh(&ioat->desc_lock); + + desc->txd.flags = flags; + desc->len = total_len; + list_splice(&chain, &desc->tx_list); + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + hw->tx_cnt = tx_cnt; + dump_desc_dbg(ioat, desc); + + return &desc->txd; +} + +static void ioat1_cleanup_event(unsigned long data) +{ + struct ioat_dma_chan *ioat = to_ioat_chan((void *) data); + struct ioat_chan_common *chan = &ioat->base; + + ioat1_cleanup(ioat); + if (!test_bit(IOAT_RUN, &chan->state)) + return; + writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +dma_addr_t ioat_get_current_completion(struct ioat_chan_common *chan) +{ + dma_addr_t phys_complete; + u64 completion; + + completion = *chan->completion; + phys_complete = ioat_chansts_to_addr(completion); + + dev_dbg(to_dev(chan), "%s: phys_complete: %#llx\n", __func__, + (unsigned long long) phys_complete); + + if (is_ioat_halted(completion)) { + u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + dev_err(to_dev(chan), "Channel halted, chanerr = %x\n", + chanerr); + + /* TODO do something to salvage the situation */ + } + + return phys_complete; +} + +bool ioat_cleanup_preamble(struct ioat_chan_common *chan, + dma_addr_t *phys_complete) +{ + *phys_complete = ioat_get_current_completion(chan); + if (*phys_complete == chan->last_completion) + return false; + clear_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + return true; +} + +static void __cleanup(struct ioat_dma_chan *ioat, dma_addr_t phys_complete) +{ + struct ioat_chan_common *chan = &ioat->base; + struct list_head *_desc, *n; + struct dma_async_tx_descriptor *tx; + + dev_dbg(to_dev(chan), "%s: phys_complete: %llx\n", + __func__, (unsigned long long) phys_complete); + list_for_each_safe(_desc, n, &ioat->used_desc) { + struct ioat_desc_sw *desc; + + prefetch(n); + desc = list_entry(_desc, typeof(*desc), node); + tx = &desc->txd; + /* + * Incoming DMA requests may use multiple descriptors, + * due to exceeding xfercap, perhaps. If so, only the + * last one will have a cookie, and require unmapping. + */ + dump_desc_dbg(ioat, desc); + if (tx->cookie) { + dma_cookie_complete(tx); + dma_descriptor_unmap(tx); + ioat->active -= desc->hw->tx_cnt; + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys != phys_complete) { + /* + * a completed entry, but not the last, so clean + * up if the client is done with the descriptor + */ + if (async_tx_test_ack(tx)) + list_move_tail(&desc->node, &ioat->free_desc); + } else { + /* + * last used desc. Do not remove, so we can + * append from it. + */ + + /* if nothing else is pending, cancel the + * completion timeout + */ + if (n == &ioat->used_desc) { + dev_dbg(to_dev(chan), + "%s cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + } + + /* TODO check status bits? */ + break; + } + } + + chan->last_completion = phys_complete; +} + +/** + * ioat1_cleanup - cleanup up finished descriptors + * @chan: ioat channel to be cleaned up + * + * To prevent lock contention we defer cleanup when the locks are + * contended with a terminal timeout that forces cleanup and catches + * completion notification errors. + */ +static void ioat1_cleanup(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + dma_addr_t phys_complete; + + prefetch(chan->completion); + + if (!spin_trylock_bh(&chan->cleanup_lock)) + return; + + if (!ioat_cleanup_preamble(chan, &phys_complete)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + if (!spin_trylock_bh(&ioat->desc_lock)) { + spin_unlock_bh(&chan->cleanup_lock); + return; + } + + __cleanup(ioat, phys_complete); + + spin_unlock_bh(&ioat->desc_lock); + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat1_timer_event(unsigned long data) +{ + struct ioat_dma_chan *ioat = to_ioat_chan((void *) data); + struct ioat_chan_common *chan = &ioat->base; + + dev_dbg(to_dev(chan), "%s: state: %lx\n", __func__, chan->state); + + spin_lock_bh(&chan->cleanup_lock); + if (test_and_clear_bit(IOAT_RESET_PENDING, &chan->state)) { + struct ioat_desc_sw *desc; + + spin_lock_bh(&ioat->desc_lock); + + /* restart active descriptors */ + desc = to_ioat_desc(ioat->used_desc.prev); + ioat_set_chainaddr(ioat, desc->txd.phys); + ioat_start(chan); + + ioat->pending = 0; + set_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + spin_unlock_bh(&ioat->desc_lock); + } else if (test_bit(IOAT_COMPLETION_PENDING, &chan->state)) { + dma_addr_t phys_complete; + + spin_lock_bh(&ioat->desc_lock); + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) + ioat1_reset_channel(ioat); + else { + u64 status = ioat_chansts(chan); + + /* manually update the last completion address */ + if (ioat_chansts_to_addr(status) != 0) + *chan->completion = status; + + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + spin_unlock_bh(&ioat->desc_lock); + } + spin_unlock_bh(&chan->cleanup_lock); +} + +enum dma_status +ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct ioat_chan_common *chan = to_chan_common(c); + struct ioatdma_device *device = chan->device; + enum dma_status ret; + + ret = dma_cookie_status(c, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + device->cleanup_fn((unsigned long) c); + + return dma_cookie_status(c, cookie, txstate); +} + +static void ioat1_dma_start_null_desc(struct ioat_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + struct ioat_desc_sw *desc; + struct ioat_dma_descriptor *hw; + + spin_lock_bh(&ioat->desc_lock); + + desc = ioat1_dma_get_next_descriptor(ioat); + + if (!desc) { + dev_err(to_dev(chan), + "Unable to start null desc - get next desc failed\n"); + spin_unlock_bh(&ioat->desc_lock); + return; + } + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.compl_write = 1; + /* set size to non-zero value (channel returns error when size is 0) */ + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + async_tx_ack(&desc->txd); + hw->next = 0; + list_add_tail(&desc->node, &ioat->used_desc); + dump_desc_dbg(ioat, desc); + + ioat_set_chainaddr(ioat, desc->txd.phys); + ioat_start(chan); + spin_unlock_bh(&ioat->desc_lock); +} + +/* + * Perform a IOAT transaction to verify the HW works. + */ +#define IOAT_TEST_SIZE 2000 + +static void ioat_dma_test_callback(void *dma_async_param) +{ + struct completion *cmp = dma_async_param; + + complete(cmp); +} + +/** + * ioat_dma_self_test - Perform a IOAT transaction to verify the HW works. + * @device: device to be tested + */ +int ioat_dma_self_test(struct ioatdma_device *device) +{ + int i; + u8 *src; + u8 *dest; + struct dma_device *dma = &device->common; + struct device *dev = &device->pdev->dev; + struct dma_chan *dma_chan; + struct dma_async_tx_descriptor *tx; + dma_addr_t dma_dest, dma_src; + dma_cookie_t cookie; + int err = 0; + struct completion cmp; + unsigned long tmo; + unsigned long flags; + + src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); + if (!src) + return -ENOMEM; + dest = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL); + if (!dest) { + kfree(src); + return -ENOMEM; + } + + /* Fill in src buffer */ + for (i = 0; i < IOAT_TEST_SIZE; i++) + src[i] = (u8)i; + + /* Start copy, using first DMA channel */ + dma_chan = container_of(dma->channels.next, struct dma_chan, + device_node); + if (dma->device_alloc_chan_resources(dma_chan) < 1) { + dev_err(dev, "selftest cannot allocate chan resource\n"); + err = -ENODEV; + goto out; + } + + dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_src)) { + dev_err(dev, "mapping src buffer failed\n"); + goto free_resources; + } + dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(dev, dma_dest)) { + dev_err(dev, "mapping dest buffer failed\n"); + goto unmap_src; + } + flags = DMA_PREP_INTERRUPT; + tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src, + IOAT_TEST_SIZE, flags); + if (!tx) { + dev_err(dev, "Self-test prep failed, disabling\n"); + err = -ENODEV; + goto unmap_dma; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test setup failed, disabling\n"); + err = -ENODEV; + goto unmap_dma; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (tmo == 0 || + dma->device_tx_status(dma_chan, cookie, NULL) + != DMA_COMPLETE) { + dev_err(dev, "Self-test copy timed out, disabling\n"); + err = -ENODEV; + goto unmap_dma; + } + if (memcmp(src, dest, IOAT_TEST_SIZE)) { + dev_err(dev, "Self-test copy failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + +unmap_dma: + dma_unmap_single(dev, dma_dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE); +unmap_src: + dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE); +free_resources: + dma->device_free_chan_resources(dma_chan); +out: + kfree(src); + kfree(dest); + return err; +} + +static char ioat_interrupt_style[32] = "msix"; +module_param_string(ioat_interrupt_style, ioat_interrupt_style, + sizeof(ioat_interrupt_style), 0644); +MODULE_PARM_DESC(ioat_interrupt_style, + "set ioat interrupt style: msix (default), msi, intx"); + +/** + * ioat_dma_setup_interrupts - setup interrupt handler + * @device: ioat device + */ +int ioat_dma_setup_interrupts(struct ioatdma_device *device) +{ + struct ioat_chan_common *chan; + struct pci_dev *pdev = device->pdev; + struct device *dev = &pdev->dev; + struct msix_entry *msix; + int i, j, msixcnt; + int err = -EINVAL; + u8 intrctrl = 0; + + if (!strcmp(ioat_interrupt_style, "msix")) + goto msix; + if (!strcmp(ioat_interrupt_style, "msi")) + goto msi; + if (!strcmp(ioat_interrupt_style, "intx")) + goto intx; + dev_err(dev, "invalid ioat_interrupt_style %s\n", ioat_interrupt_style); + goto err_no_irq; + +msix: + /* The number of MSI-X vectors should equal the number of channels */ + msixcnt = device->common.chancnt; + for (i = 0; i < msixcnt; i++) + device->msix_entries[i].entry = i; + + err = pci_enable_msix_exact(pdev, device->msix_entries, msixcnt); + if (err) + goto msi; + + for (i = 0; i < msixcnt; i++) { + msix = &device->msix_entries[i]; + chan = ioat_chan_by_index(device, i); + err = devm_request_irq(dev, msix->vector, + ioat_dma_do_interrupt_msix, 0, + "ioat-msix", chan); + if (err) { + for (j = 0; j < i; j++) { + msix = &device->msix_entries[j]; + chan = ioat_chan_by_index(device, j); + devm_free_irq(dev, msix->vector, chan); + } + goto msi; + } + } + intrctrl |= IOAT_INTRCTRL_MSIX_VECTOR_CONTROL; + device->irq_mode = IOAT_MSIX; + goto done; + +msi: + err = pci_enable_msi(pdev); + if (err) + goto intx; + + err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, 0, + "ioat-msi", device); + if (err) { + pci_disable_msi(pdev); + goto intx; + } + device->irq_mode = IOAT_MSI; + goto done; + +intx: + err = devm_request_irq(dev, pdev->irq, ioat_dma_do_interrupt, + IRQF_SHARED, "ioat-intx", device); + if (err) + goto err_no_irq; + + device->irq_mode = IOAT_INTX; +done: + if (device->intr_quirk) + device->intr_quirk(device); + intrctrl |= IOAT_INTRCTRL_MASTER_INT_EN; + writeb(intrctrl, device->reg_base + IOAT_INTRCTRL_OFFSET); + return 0; + +err_no_irq: + /* Disable all interrupt generation */ + writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); + device->irq_mode = IOAT_NOIRQ; + dev_err(dev, "no usable interrupts\n"); + return err; +} +EXPORT_SYMBOL(ioat_dma_setup_interrupts); + +static void ioat_disable_interrupts(struct ioatdma_device *device) +{ + /* Disable all interrupt generation */ + writeb(0, device->reg_base + IOAT_INTRCTRL_OFFSET); +} + +int ioat_probe(struct ioatdma_device *device) +{ + int err = -ENODEV; + struct dma_device *dma = &device->common; + struct pci_dev *pdev = device->pdev; + struct device *dev = &pdev->dev; + + /* DMA coherent memory pool for DMA descriptor allocations */ + device->dma_pool = pci_pool_create("dma_desc_pool", pdev, + sizeof(struct ioat_dma_descriptor), + 64, 0); + if (!device->dma_pool) { + err = -ENOMEM; + goto err_dma_pool; + } + + device->completion_pool = pci_pool_create("completion_pool", pdev, + sizeof(u64), SMP_CACHE_BYTES, + SMP_CACHE_BYTES); + + if (!device->completion_pool) { + err = -ENOMEM; + goto err_completion_pool; + } + + device->enumerate_channels(device); + + dma_cap_set(DMA_MEMCPY, dma->cap_mask); + dma->dev = &pdev->dev; + + if (!dma->chancnt) { + dev_err(dev, "channel enumeration error\n"); + goto err_setup_interrupts; + } + + err = ioat_dma_setup_interrupts(device); + if (err) + goto err_setup_interrupts; + + err = device->self_test(device); + if (err) + goto err_self_test; + + return 0; + +err_self_test: + ioat_disable_interrupts(device); +err_setup_interrupts: + pci_pool_destroy(device->completion_pool); +err_completion_pool: + pci_pool_destroy(device->dma_pool); +err_dma_pool: + return err; +} + +int ioat_register(struct ioatdma_device *device) +{ + int err = dma_async_device_register(&device->common); + + if (err) { + ioat_disable_interrupts(device); + pci_pool_destroy(device->completion_pool); + pci_pool_destroy(device->dma_pool); + } + + return err; +} + +/* ioat1_intr_quirk - fix up dma ctrl register to enable / disable msi */ +static void ioat1_intr_quirk(struct ioatdma_device *device) +{ + struct pci_dev *pdev = device->pdev; + u32 dmactrl; + + pci_read_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, &dmactrl); + if (pdev->msi_enabled) + dmactrl |= IOAT_PCI_DMACTRL_MSI_EN; + else + dmactrl &= ~IOAT_PCI_DMACTRL_MSI_EN; + pci_write_config_dword(pdev, IOAT_PCI_DMACTRL_OFFSET, dmactrl); +} + +static ssize_t ring_size_show(struct dma_chan *c, char *page) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + + return sprintf(page, "%d\n", ioat->desccount); +} +static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size); + +static ssize_t ring_active_show(struct dma_chan *c, char *page) +{ + struct ioat_dma_chan *ioat = to_ioat_chan(c); + + return sprintf(page, "%d\n", ioat->active); +} +static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active); + +static ssize_t cap_show(struct dma_chan *c, char *page) +{ + struct dma_device *dma = c->device; + + return sprintf(page, "copy%s%s%s%s%s\n", + dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "", + dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "", + dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "", + dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "", + dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : ""); + +} +struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap); + +static ssize_t version_show(struct dma_chan *c, char *page) +{ + struct dma_device *dma = c->device; + struct ioatdma_device *device = to_ioatdma_device(dma); + + return sprintf(page, "%d.%d\n", + device->version >> 4, device->version & 0xf); +} +struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version); + +static struct attribute *ioat1_attrs[] = { + &ring_size_attr.attr, + &ring_active_attr.attr, + &ioat_cap_attr.attr, + &ioat_version_attr.attr, + NULL, +}; + +static ssize_t +ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page) +{ + struct ioat_sysfs_entry *entry; + struct ioat_chan_common *chan; + + entry = container_of(attr, struct ioat_sysfs_entry, attr); + chan = container_of(kobj, struct ioat_chan_common, kobj); + + if (!entry->show) + return -EIO; + return entry->show(&chan->common, page); +} + +const struct sysfs_ops ioat_sysfs_ops = { + .show = ioat_attr_show, +}; + +static struct kobj_type ioat1_ktype = { + .sysfs_ops = &ioat_sysfs_ops, + .default_attrs = ioat1_attrs, +}; + +void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type) +{ + struct dma_device *dma = &device->common; + struct dma_chan *c; + + list_for_each_entry(c, &dma->channels, device_node) { + struct ioat_chan_common *chan = to_chan_common(c); + struct kobject *parent = &c->dev->device.kobj; + int err; + + err = kobject_init_and_add(&chan->kobj, type, parent, "quickdata"); + if (err) { + dev_warn(to_dev(chan), + "sysfs init error (%d), continuing...\n", err); + kobject_put(&chan->kobj); + set_bit(IOAT_KOBJ_INIT_FAIL, &chan->state); + } + } +} + +void ioat_kobject_del(struct ioatdma_device *device) +{ + struct dma_device *dma = &device->common; + struct dma_chan *c; + + list_for_each_entry(c, &dma->channels, device_node) { + struct ioat_chan_common *chan = to_chan_common(c); + + if (!test_bit(IOAT_KOBJ_INIT_FAIL, &chan->state)) { + kobject_del(&chan->kobj); + kobject_put(&chan->kobj); + } + } +} + +int ioat1_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + int err; + + device->intr_quirk = ioat1_intr_quirk; + device->enumerate_channels = ioat1_enumerate_channels; + device->self_test = ioat_dma_self_test; + device->timer_fn = ioat1_timer_event; + device->cleanup_fn = ioat1_cleanup_event; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat1_dma_prep_memcpy; + dma->device_issue_pending = ioat1_dma_memcpy_issue_pending; + dma->device_alloc_chan_resources = ioat1_dma_alloc_chan_resources; + dma->device_free_chan_resources = ioat1_dma_free_chan_resources; + dma->device_tx_status = ioat_dma_tx_status; + + err = ioat_probe(device); + if (err) + return err; + err = ioat_register(device); + if (err) + return err; + ioat_kobject_add(device, &ioat1_ktype); + + if (dca) + device->dca = ioat_dca_init(pdev, device->reg_base); + + return err; +} + +void ioat_dma_remove(struct ioatdma_device *device) +{ + struct dma_device *dma = &device->common; + + ioat_disable_interrupts(device); + + ioat_kobject_del(device); + + dma_async_device_unregister(dma); + + pci_pool_destroy(device->dma_pool); + pci_pool_destroy(device->completion_pool); + + INIT_LIST_HEAD(&dma->channels); +} diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h new file mode 100644 index 000000000..30f5c7eed --- /dev/null +++ b/drivers/dma/ioat/dma.h @@ -0,0 +1,352 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef IOATDMA_H +#define IOATDMA_H + +#include <linux/dmaengine.h> +#include "hw.h" +#include "registers.h" +#include <linux/init.h> +#include <linux/dmapool.h> +#include <linux/cache.h> +#include <linux/pci_ids.h> +#include <net/tcp.h> + +#define IOAT_DMA_VERSION "4.00" + +#define IOAT_LOW_COMPLETION_MASK 0xffffffc0 +#define IOAT_DMA_DCA_ANY_CPU ~0 + +#define to_ioatdma_device(dev) container_of(dev, struct ioatdma_device, common) +#define to_ioat_desc(lh) container_of(lh, struct ioat_desc_sw, node) +#define tx_to_ioat_desc(tx) container_of(tx, struct ioat_desc_sw, txd) +#define to_dev(ioat_chan) (&(ioat_chan)->device->pdev->dev) +#define to_pdev(ioat_chan) ((ioat_chan)->device->pdev) + +#define chan_num(ch) ((int)((ch)->reg_base - (ch)->device->reg_base) / 0x80) + +/* + * workaround for IOAT ver.3.0 null descriptor issue + * (channel returns error when size is 0) + */ +#define NULL_DESC_BUFFER_SIZE 1 + +enum ioat_irq_mode { + IOAT_NOIRQ = 0, + IOAT_MSIX, + IOAT_MSI, + IOAT_INTX +}; + +/** + * struct ioatdma_device - internal representation of a IOAT device + * @pdev: PCI-Express device + * @reg_base: MMIO register space base address + * @dma_pool: for allocating DMA descriptors + * @common: embedded struct dma_device + * @version: version of ioatdma device + * @msix_entries: irq handlers + * @idx: per channel data + * @dca: direct cache access context + * @intr_quirk: interrupt setup quirk (for ioat_v1 devices) + * @enumerate_channels: hw version specific channel enumeration + * @reset_hw: hw version specific channel (re)initialization + * @cleanup_fn: select between the v2 and v3 cleanup routines + * @timer_fn: select between the v2 and v3 timer watchdog routines + * @self_test: hardware version specific self test for each supported op type + * + * Note: the v3 cleanup routine supports raid operations + */ +struct ioatdma_device { + struct pci_dev *pdev; + void __iomem *reg_base; + struct pci_pool *dma_pool; + struct pci_pool *completion_pool; +#define MAX_SED_POOLS 5 + struct dma_pool *sed_hw_pool[MAX_SED_POOLS]; + struct dma_device common; + u8 version; + struct msix_entry msix_entries[4]; + struct ioat_chan_common *idx[4]; + struct dca_provider *dca; + enum ioat_irq_mode irq_mode; + u32 cap; + void (*intr_quirk)(struct ioatdma_device *device); + int (*enumerate_channels)(struct ioatdma_device *device); + int (*reset_hw)(struct ioat_chan_common *chan); + void (*cleanup_fn)(unsigned long data); + void (*timer_fn)(unsigned long data); + int (*self_test)(struct ioatdma_device *device); +}; + +struct ioat_chan_common { + struct dma_chan common; + void __iomem *reg_base; + dma_addr_t last_completion; + spinlock_t cleanup_lock; + unsigned long state; + #define IOAT_COMPLETION_PENDING 0 + #define IOAT_COMPLETION_ACK 1 + #define IOAT_RESET_PENDING 2 + #define IOAT_KOBJ_INIT_FAIL 3 + #define IOAT_RESHAPE_PENDING 4 + #define IOAT_RUN 5 + #define IOAT_CHAN_ACTIVE 6 + struct timer_list timer; + #define COMPLETION_TIMEOUT msecs_to_jiffies(100) + #define IDLE_TIMEOUT msecs_to_jiffies(2000) + #define RESET_DELAY msecs_to_jiffies(100) + struct ioatdma_device *device; + dma_addr_t completion_dma; + u64 *completion; + struct tasklet_struct cleanup_task; + struct kobject kobj; +}; + +struct ioat_sysfs_entry { + struct attribute attr; + ssize_t (*show)(struct dma_chan *, char *); +}; + +/** + * struct ioat_dma_chan - internal representation of a DMA channel + */ +struct ioat_dma_chan { + struct ioat_chan_common base; + + size_t xfercap; /* XFERCAP register value expanded out */ + + spinlock_t desc_lock; + struct list_head free_desc; + struct list_head used_desc; + + int pending; + u16 desccount; + u16 active; +}; + +/** + * struct ioat_sed_ent - wrapper around super extended hardware descriptor + * @hw: hardware SED + * @sed_dma: dma address for the SED + * @list: list member + * @parent: point to the dma descriptor that's the parent + */ +struct ioat_sed_ent { + struct ioat_sed_raw_descriptor *hw; + dma_addr_t dma; + struct ioat_ring_ent *parent; + unsigned int hw_pool; +}; + +static inline struct ioat_chan_common *to_chan_common(struct dma_chan *c) +{ + return container_of(c, struct ioat_chan_common, common); +} + +static inline struct ioat_dma_chan *to_ioat_chan(struct dma_chan *c) +{ + struct ioat_chan_common *chan = to_chan_common(c); + + return container_of(chan, struct ioat_dma_chan, base); +} + +/* wrapper around hardware descriptor format + additional software fields */ + +/** + * struct ioat_desc_sw - wrapper around hardware descriptor + * @hw: hardware DMA descriptor (for memcpy) + * @node: this descriptor will either be on the free list, + * or attached to a transaction list (tx_list) + * @txd: the generic software descriptor for all engines + * @id: identifier for debug + */ +struct ioat_desc_sw { + struct ioat_dma_descriptor *hw; + struct list_head node; + size_t len; + struct list_head tx_list; + struct dma_async_tx_descriptor txd; + #ifdef DEBUG + int id; + #endif +}; + +#ifdef DEBUG +#define set_desc_id(desc, i) ((desc)->id = (i)) +#define desc_id(desc) ((desc)->id) +#else +#define set_desc_id(desc, i) +#define desc_id(desc) (0) +#endif + +static inline void +__dump_desc_dbg(struct ioat_chan_common *chan, struct ioat_dma_descriptor *hw, + struct dma_async_tx_descriptor *tx, int id) +{ + struct device *dev = to_dev(chan); + + dev_dbg(dev, "desc[%d]: (%#llx->%#llx) cookie: %d flags: %#x" + " ctl: %#10.8x (op: %#x int_en: %d compl: %d)\n", id, + (unsigned long long) tx->phys, + (unsigned long long) hw->next, tx->cookie, tx->flags, + hw->ctl, hw->ctl_f.op, hw->ctl_f.int_en, hw->ctl_f.compl_write); +} + +#define dump_desc_dbg(c, d) \ + ({ if (d) __dump_desc_dbg(&c->base, d->hw, &d->txd, desc_id(d)); 0; }) + +static inline struct ioat_chan_common * +ioat_chan_by_index(struct ioatdma_device *device, int index) +{ + return device->idx[index]; +} + +static inline u64 ioat_chansts_32(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + u64 status; + u32 status_lo; + + /* We need to read the low address first as this causes the + * chipset to latch the upper bits for the subsequent read + */ + status_lo = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_LOW(ver)); + status = readl(chan->reg_base + IOAT_CHANSTS_OFFSET_HIGH(ver)); + status <<= 32; + status |= status_lo; + + return status; +} + +#if BITS_PER_LONG == 64 + +static inline u64 ioat_chansts(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + u64 status; + + /* With IOAT v3.3 the status register is 64bit. */ + if (ver >= IOAT_VER_3_3) + status = readq(chan->reg_base + IOAT_CHANSTS_OFFSET(ver)); + else + status = ioat_chansts_32(chan); + + return status; +} + +#else +#define ioat_chansts ioat_chansts_32 +#endif + +static inline void ioat_start(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + + writeb(IOAT_CHANCMD_START, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); +} + +static inline u64 ioat_chansts_to_addr(u64 status) +{ + return status & IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR; +} + +static inline u32 ioat_chanerr(struct ioat_chan_common *chan) +{ + return readl(chan->reg_base + IOAT_CHANERR_OFFSET); +} + +static inline void ioat_suspend(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + + writeb(IOAT_CHANCMD_SUSPEND, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); +} + +static inline void ioat_reset(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + + writeb(IOAT_CHANCMD_RESET, chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); +} + +static inline bool ioat_reset_pending(struct ioat_chan_common *chan) +{ + u8 ver = chan->device->version; + u8 cmd; + + cmd = readb(chan->reg_base + IOAT_CHANCMD_OFFSET(ver)); + return (cmd & IOAT_CHANCMD_RESET) == IOAT_CHANCMD_RESET; +} + +static inline void ioat_set_chainaddr(struct ioat_dma_chan *ioat, u64 addr) +{ + struct ioat_chan_common *chan = &ioat->base; + + writel(addr & 0x00000000FFFFFFFF, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_LOW); + writel(addr >> 32, + chan->reg_base + IOAT1_CHAINADDR_OFFSET_HIGH); +} + +static inline bool is_ioat_active(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_ACTIVE); +} + +static inline bool is_ioat_idle(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_DONE); +} + +static inline bool is_ioat_halted(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_HALTED); +} + +static inline bool is_ioat_suspended(unsigned long status) +{ + return ((status & IOAT_CHANSTS_STATUS) == IOAT_CHANSTS_SUSPENDED); +} + +/* channel was fatally programmed */ +static inline bool is_ioat_bug(unsigned long err) +{ + return !!err; +} + +int ioat_probe(struct ioatdma_device *device); +int ioat_register(struct ioatdma_device *device); +int ioat1_dma_probe(struct ioatdma_device *dev, int dca); +int ioat_dma_self_test(struct ioatdma_device *device); +void ioat_dma_remove(struct ioatdma_device *device); +struct dca_provider *ioat_dca_init(struct pci_dev *pdev, void __iomem *iobase); +dma_addr_t ioat_get_current_completion(struct ioat_chan_common *chan); +void ioat_init_channel(struct ioatdma_device *device, + struct ioat_chan_common *chan, int idx); +enum dma_status ioat_dma_tx_status(struct dma_chan *c, dma_cookie_t cookie, + struct dma_tx_state *txstate); +bool ioat_cleanup_preamble(struct ioat_chan_common *chan, + dma_addr_t *phys_complete); +void ioat_kobject_add(struct ioatdma_device *device, struct kobj_type *type); +void ioat_kobject_del(struct ioatdma_device *device); +int ioat_dma_setup_interrupts(struct ioatdma_device *device); +void ioat_stop(struct ioat_chan_common *chan); +extern const struct sysfs_ops ioat_sysfs_ops; +extern struct ioat_sysfs_entry ioat_version_attr; +extern struct ioat_sysfs_entry ioat_cap_attr; +#endif /* IOATDMA_H */ diff --git a/drivers/dma/ioat/dma_v2.c b/drivers/dma/ioat/dma_v2.c new file mode 100644 index 000000000..69c7dfcad --- /dev/null +++ b/drivers/dma/ioat/dma_v2.c @@ -0,0 +1,916 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2004 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine (versions >= 2), which + * does asynchronous data movement and checksumming operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/workqueue.h> +#include <linux/prefetch.h> +#include <linux/i7300_idle.h> +#include "dma.h" +#include "dma_v2.h" +#include "registers.h" +#include "hw.h" + +#include "../dmaengine.h" + +int ioat_ring_alloc_order = 8; +module_param(ioat_ring_alloc_order, int, 0644); +MODULE_PARM_DESC(ioat_ring_alloc_order, + "ioat2+: allocate 2^n descriptors per channel" + " (default: 8 max: 16)"); +static int ioat_ring_max_alloc_order = IOAT_MAX_ORDER; +module_param(ioat_ring_max_alloc_order, int, 0644); +MODULE_PARM_DESC(ioat_ring_max_alloc_order, + "ioat2+: upper limit for ring size (default: 16)"); + +void __ioat2_issue_pending(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + + ioat->dmacount += ioat2_ring_pending(ioat); + ioat->issued = ioat->head; + writew(ioat->dmacount, chan->reg_base + IOAT_CHAN_DMACOUNT_OFFSET); + dev_dbg(to_dev(chan), + "%s: head: %#x tail: %#x issued: %#x count: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); +} + +void ioat2_issue_pending(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + if (ioat2_ring_pending(ioat)) { + spin_lock_bh(&ioat->prep_lock); + __ioat2_issue_pending(ioat); + spin_unlock_bh(&ioat->prep_lock); + } +} + +/** + * ioat2_update_pending - log pending descriptors + * @ioat: ioat2+ channel + * + * Check if the number of unsubmitted descriptors has exceeded the + * watermark. Called with prep_lock held + */ +static void ioat2_update_pending(struct ioat2_dma_chan *ioat) +{ + if (ioat2_ring_pending(ioat) > ioat_pending_level) + __ioat2_issue_pending(ioat); +} + +static void __ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + struct ioat_ring_ent *desc; + struct ioat_dma_descriptor *hw; + + if (ioat2_ring_space(ioat) < 1) { + dev_err(to_dev(&ioat->base), + "Unable to start null desc - ring full\n"); + return; + } + + dev_dbg(to_dev(&ioat->base), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); + desc = ioat2_get_ring_ent(ioat, ioat->head); + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.compl_write = 1; + /* set size to non-zero value (channel returns error when size is 0) */ + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + async_tx_ack(&desc->txd); + ioat2_set_chainaddr(ioat, desc->txd.phys); + dump_desc_dbg(ioat, desc); + wmb(); + ioat->head += 1; + __ioat2_issue_pending(ioat); +} + +static void ioat2_start_null_desc(struct ioat2_dma_chan *ioat) +{ + spin_lock_bh(&ioat->prep_lock); + __ioat2_start_null_desc(ioat); + spin_unlock_bh(&ioat->prep_lock); +} + +static void __cleanup(struct ioat2_dma_chan *ioat, dma_addr_t phys_complete) +{ + struct ioat_chan_common *chan = &ioat->base; + struct dma_async_tx_descriptor *tx; + struct ioat_ring_ent *desc; + bool seen_current = false; + u16 active; + int idx = ioat->tail, i; + + dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); + + active = ioat2_ring_active(ioat); + for (i = 0; i < active && !seen_current; i++) { + smp_read_barrier_depends(); + prefetch(ioat2_get_ring_ent(ioat, idx + i + 1)); + desc = ioat2_get_ring_ent(ioat, idx + i); + tx = &desc->txd; + dump_desc_dbg(ioat, desc); + if (tx->cookie) { + dma_descriptor_unmap(tx); + dma_cookie_complete(tx); + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys == phys_complete) + seen_current = true; + } + smp_mb(); /* finish all descriptor reads before incrementing tail */ + ioat->tail = idx + i; + BUG_ON(active && !seen_current); /* no active descs have written a completion? */ + + chan->last_completion = phys_complete; + if (active - i == 0) { + dev_dbg(to_dev(chan), "%s: cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } +} + +/** + * ioat2_cleanup - clean finished descriptors (advance tail pointer) + * @chan: ioat channel to be cleaned up + */ +static void ioat2_cleanup(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + dma_addr_t phys_complete; + + spin_lock_bh(&chan->cleanup_lock); + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + spin_unlock_bh(&chan->cleanup_lock); +} + +void ioat2_cleanup_event(unsigned long data) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); + struct ioat_chan_common *chan = &ioat->base; + + ioat2_cleanup(ioat); + if (!test_bit(IOAT_RUN, &chan->state)) + return; + writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +void __ioat2_restart_chan(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + + /* set the tail to be re-issued */ + ioat->issued = ioat->tail; + ioat->dmacount = 0; + set_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + dev_dbg(to_dev(chan), + "%s: head: %#x tail: %#x issued: %#x count: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued, ioat->dmacount); + + if (ioat2_ring_pending(ioat)) { + struct ioat_ring_ent *desc; + + desc = ioat2_get_ring_ent(ioat, ioat->tail); + ioat2_set_chainaddr(ioat, desc->txd.phys); + __ioat2_issue_pending(ioat); + } else + __ioat2_start_null_desc(ioat); +} + +int ioat2_quiesce(struct ioat_chan_common *chan, unsigned long tmo) +{ + unsigned long end = jiffies + tmo; + int err = 0; + u32 status; + + status = ioat_chansts(chan); + if (is_ioat_active(status) || is_ioat_idle(status)) + ioat_suspend(chan); + while (is_ioat_active(status) || is_ioat_idle(status)) { + if (tmo && time_after(jiffies, end)) { + err = -ETIMEDOUT; + break; + } + status = ioat_chansts(chan); + cpu_relax(); + } + + return err; +} + +int ioat2_reset_sync(struct ioat_chan_common *chan, unsigned long tmo) +{ + unsigned long end = jiffies + tmo; + int err = 0; + + ioat_reset(chan); + while (ioat_reset_pending(chan)) { + if (end && time_after(jiffies, end)) { + err = -ETIMEDOUT; + break; + } + cpu_relax(); + } + + return err; +} + +static void ioat2_restart_channel(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + dma_addr_t phys_complete; + + ioat2_quiesce(chan, 0); + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + + __ioat2_restart_chan(ioat); +} + +static void check_active(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + + if (ioat2_ring_active(ioat)) { + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + return; + } + + if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &chan->state)) + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + else if (ioat->alloc_order > ioat_get_alloc_order()) { + /* if the ring is idle, empty, and oversized try to step + * down the size + */ + reshape_ring(ioat, ioat->alloc_order - 1); + + /* keep shrinking until we get back to our minimum + * default size + */ + if (ioat->alloc_order > ioat_get_alloc_order()) + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } + +} + +void ioat2_timer_event(unsigned long data) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); + struct ioat_chan_common *chan = &ioat->base; + dma_addr_t phys_complete; + u64 status; + + status = ioat_chansts(chan); + + /* when halted due to errors check for channel + * programming errors before advancing the completion state + */ + if (is_ioat_halted(status)) { + u32 chanerr; + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + dev_err(to_dev(chan), "%s: Channel halted (%x)\n", + __func__, chanerr); + if (test_bit(IOAT_RUN, &chan->state)) + BUG_ON(is_ioat_bug(chanerr)); + else /* we never got off the ground */ + return; + } + + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + spin_lock_bh(&chan->cleanup_lock); + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) { + spin_lock_bh(&ioat->prep_lock); + ioat2_restart_channel(ioat); + spin_unlock_bh(&ioat->prep_lock); + spin_unlock_bh(&chan->cleanup_lock); + return; + } else { + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + + + if (ioat2_ring_active(ioat)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + else { + spin_lock_bh(&ioat->prep_lock); + check_active(ioat); + spin_unlock_bh(&ioat->prep_lock); + } + spin_unlock_bh(&chan->cleanup_lock); +} + +static int ioat2_reset_hw(struct ioat_chan_common *chan) +{ + /* throw away whatever the channel was doing and get it initialized */ + u32 chanerr; + + ioat2_quiesce(chan, msecs_to_jiffies(100)); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + + return ioat2_reset_sync(chan, msecs_to_jiffies(200)); +} + +/** + * ioat2_enumerate_channels - find and initialize the device's channels + * @device: the device to be enumerated + */ +int ioat2_enumerate_channels(struct ioatdma_device *device) +{ + struct ioat2_dma_chan *ioat; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + u8 xfercap_log; + int i; + + INIT_LIST_HEAD(&dma->channels); + dma->chancnt = readb(device->reg_base + IOAT_CHANCNT_OFFSET); + dma->chancnt &= 0x1f; /* bits [4:0] valid */ + if (dma->chancnt > ARRAY_SIZE(device->idx)) { + dev_warn(dev, "(%d) exceeds max supported channels (%zu)\n", + dma->chancnt, ARRAY_SIZE(device->idx)); + dma->chancnt = ARRAY_SIZE(device->idx); + } + xfercap_log = readb(device->reg_base + IOAT_XFERCAP_OFFSET); + xfercap_log &= 0x1f; /* bits [4:0] valid */ + if (xfercap_log == 0) + return 0; + dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log); + + /* FIXME which i/oat version is i7300? */ +#ifdef CONFIG_I7300_IDLE_IOAT_CHANNEL + if (i7300_idle_platform_probe(NULL, NULL, 1) == 0) + dma->chancnt--; +#endif + for (i = 0; i < dma->chancnt; i++) { + ioat = devm_kzalloc(dev, sizeof(*ioat), GFP_KERNEL); + if (!ioat) + break; + + ioat_init_channel(device, &ioat->base, i); + ioat->xfercap_log = xfercap_log; + spin_lock_init(&ioat->prep_lock); + if (device->reset_hw(&ioat->base)) { + i = 0; + break; + } + } + dma->chancnt = i; + return i; +} + +static dma_cookie_t ioat2_tx_submit_unlock(struct dma_async_tx_descriptor *tx) +{ + struct dma_chan *c = tx->chan; + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + dma_cookie_t cookie; + + cookie = dma_cookie_assign(tx); + dev_dbg(to_dev(&ioat->base), "%s: cookie: %d\n", __func__, cookie); + + if (!test_and_set_bit(IOAT_CHAN_ACTIVE, &chan->state)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + /* make descriptor updates visible before advancing ioat->head, + * this is purposefully not smp_wmb() since we are also + * publishing the descriptor updates to a dma device + */ + wmb(); + + ioat->head += ioat->produce; + + ioat2_update_pending(ioat); + spin_unlock_bh(&ioat->prep_lock); + + return cookie; +} + +static struct ioat_ring_ent *ioat2_alloc_ring_ent(struct dma_chan *chan, gfp_t flags) +{ + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + struct ioatdma_device *dma; + dma_addr_t phys; + + dma = to_ioatdma_device(chan->device); + hw = pci_pool_alloc(dma->dma_pool, flags, &phys); + if (!hw) + return NULL; + memset(hw, 0, sizeof(*hw)); + + desc = kmem_cache_zalloc(ioat2_cache, flags); + if (!desc) { + pci_pool_free(dma->dma_pool, hw, phys); + return NULL; + } + + dma_async_tx_descriptor_init(&desc->txd, chan); + desc->txd.tx_submit = ioat2_tx_submit_unlock; + desc->hw = hw; + desc->txd.phys = phys; + return desc; +} + +static void ioat2_free_ring_ent(struct ioat_ring_ent *desc, struct dma_chan *chan) +{ + struct ioatdma_device *dma; + + dma = to_ioatdma_device(chan->device); + pci_pool_free(dma->dma_pool, desc->hw, desc->txd.phys); + kmem_cache_free(ioat2_cache, desc); +} + +static struct ioat_ring_ent **ioat2_alloc_ring(struct dma_chan *c, int order, gfp_t flags) +{ + struct ioat_ring_ent **ring; + int descs = 1 << order; + int i; + + if (order > ioat_get_max_alloc_order()) + return NULL; + + /* allocate the array to hold the software ring */ + ring = kcalloc(descs, sizeof(*ring), flags); + if (!ring) + return NULL; + for (i = 0; i < descs; i++) { + ring[i] = ioat2_alloc_ring_ent(c, flags); + if (!ring[i]) { + while (i--) + ioat2_free_ring_ent(ring[i], c); + kfree(ring); + return NULL; + } + set_desc_id(ring[i], i); + } + + /* link descs */ + for (i = 0; i < descs-1; i++) { + struct ioat_ring_ent *next = ring[i+1]; + struct ioat_dma_descriptor *hw = ring[i]->hw; + + hw->next = next->txd.phys; + } + ring[i]->hw->next = ring[0]->txd.phys; + + return ring; +} + +void ioat2_free_chan_resources(struct dma_chan *c); + +/* ioat2_alloc_chan_resources - allocate/initialize ioat2 descriptor ring + * @chan: channel to be initialized + */ +int ioat2_alloc_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioat_ring_ent **ring; + u64 status; + int order; + int i = 0; + + /* have we already been set up? */ + if (ioat->ring) + return 1 << ioat->alloc_order; + + /* Setup register to interrupt and write completion status on error */ + writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET); + + /* allocate a completion writeback area */ + /* doing 2 32bit writes to mmio since 1 64b write doesn't work */ + chan->completion = pci_pool_alloc(chan->device->completion_pool, + GFP_KERNEL, &chan->completion_dma); + if (!chan->completion) + return -ENOMEM; + + memset(chan->completion, 0, sizeof(*chan->completion)); + writel(((u64) chan->completion_dma) & 0x00000000FFFFFFFF, + chan->reg_base + IOAT_CHANCMP_OFFSET_LOW); + writel(((u64) chan->completion_dma) >> 32, + chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH); + + order = ioat_get_alloc_order(); + ring = ioat2_alloc_ring(c, order, GFP_KERNEL); + if (!ring) + return -ENOMEM; + + spin_lock_bh(&chan->cleanup_lock); + spin_lock_bh(&ioat->prep_lock); + ioat->ring = ring; + ioat->head = 0; + ioat->issued = 0; + ioat->tail = 0; + ioat->alloc_order = order; + set_bit(IOAT_RUN, &chan->state); + spin_unlock_bh(&ioat->prep_lock); + spin_unlock_bh(&chan->cleanup_lock); + + ioat2_start_null_desc(ioat); + + /* check that we got off the ground */ + do { + udelay(1); + status = ioat_chansts(chan); + } while (i++ < 20 && !is_ioat_active(status) && !is_ioat_idle(status)); + + if (is_ioat_active(status) || is_ioat_idle(status)) { + return 1 << ioat->alloc_order; + } else { + u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + + dev_WARN(to_dev(chan), + "failed to start channel chanerr: %#x\n", chanerr); + ioat2_free_chan_resources(c); + return -EFAULT; + } +} + +bool reshape_ring(struct ioat2_dma_chan *ioat, int order) +{ + /* reshape differs from normal ring allocation in that we want + * to allocate a new software ring while only + * extending/truncating the hardware ring + */ + struct ioat_chan_common *chan = &ioat->base; + struct dma_chan *c = &chan->common; + const u32 curr_size = ioat2_ring_size(ioat); + const u16 active = ioat2_ring_active(ioat); + const u32 new_size = 1 << order; + struct ioat_ring_ent **ring; + u16 i; + + if (order > ioat_get_max_alloc_order()) + return false; + + /* double check that we have at least 1 free descriptor */ + if (active == curr_size) + return false; + + /* when shrinking, verify that we can hold the current active + * set in the new ring + */ + if (active >= new_size) + return false; + + /* allocate the array to hold the software ring */ + ring = kcalloc(new_size, sizeof(*ring), GFP_NOWAIT); + if (!ring) + return false; + + /* allocate/trim descriptors as needed */ + if (new_size > curr_size) { + /* copy current descriptors to the new ring */ + for (i = 0; i < curr_size; i++) { + u16 curr_idx = (ioat->tail+i) & (curr_size-1); + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat->ring[curr_idx]; + set_desc_id(ring[new_idx], new_idx); + } + + /* add new descriptors to the ring */ + for (i = curr_size; i < new_size; i++) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat2_alloc_ring_ent(c, GFP_NOWAIT); + if (!ring[new_idx]) { + while (i--) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ioat2_free_ring_ent(ring[new_idx], c); + } + kfree(ring); + return false; + } + set_desc_id(ring[new_idx], new_idx); + } + + /* hw link new descriptors */ + for (i = curr_size-1; i < new_size; i++) { + u16 new_idx = (ioat->tail+i) & (new_size-1); + struct ioat_ring_ent *next = ring[(new_idx+1) & (new_size-1)]; + struct ioat_dma_descriptor *hw = ring[new_idx]->hw; + + hw->next = next->txd.phys; + } + } else { + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *next; + + /* copy current descriptors to the new ring, dropping the + * removed descriptors + */ + for (i = 0; i < new_size; i++) { + u16 curr_idx = (ioat->tail+i) & (curr_size-1); + u16 new_idx = (ioat->tail+i) & (new_size-1); + + ring[new_idx] = ioat->ring[curr_idx]; + set_desc_id(ring[new_idx], new_idx); + } + + /* free deleted descriptors */ + for (i = new_size; i < curr_size; i++) { + struct ioat_ring_ent *ent; + + ent = ioat2_get_ring_ent(ioat, ioat->tail+i); + ioat2_free_ring_ent(ent, c); + } + + /* fix up hardware ring */ + hw = ring[(ioat->tail+new_size-1) & (new_size-1)]->hw; + next = ring[(ioat->tail+new_size) & (new_size-1)]; + hw->next = next->txd.phys; + } + + dev_dbg(to_dev(chan), "%s: allocated %d descriptors\n", + __func__, new_size); + + kfree(ioat->ring); + ioat->ring = ring; + ioat->alloc_order = order; + + return true; +} + +/** + * ioat2_check_space_lock - verify space and grab ring producer lock + * @ioat: ioat2,3 channel (ring) to operate on + * @num_descs: allocation length + */ +int ioat2_check_space_lock(struct ioat2_dma_chan *ioat, int num_descs) +{ + struct ioat_chan_common *chan = &ioat->base; + bool retry; + + retry: + spin_lock_bh(&ioat->prep_lock); + /* never allow the last descriptor to be consumed, we need at + * least one free at all times to allow for on-the-fly ring + * resizing. + */ + if (likely(ioat2_ring_space(ioat) > num_descs)) { + dev_dbg(to_dev(chan), "%s: num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, ioat->issued); + ioat->produce = num_descs; + return 0; /* with ioat->prep_lock held */ + } + retry = test_and_set_bit(IOAT_RESHAPE_PENDING, &chan->state); + spin_unlock_bh(&ioat->prep_lock); + + /* is another cpu already trying to expand the ring? */ + if (retry) + goto retry; + + spin_lock_bh(&chan->cleanup_lock); + spin_lock_bh(&ioat->prep_lock); + retry = reshape_ring(ioat, ioat->alloc_order + 1); + clear_bit(IOAT_RESHAPE_PENDING, &chan->state); + spin_unlock_bh(&ioat->prep_lock); + spin_unlock_bh(&chan->cleanup_lock); + + /* if we were able to expand the ring retry the allocation */ + if (retry) + goto retry; + + if (printk_ratelimit()) + dev_dbg(to_dev(chan), "%s: ring full! num_descs: %d (%x:%x:%x)\n", + __func__, num_descs, ioat->head, ioat->tail, ioat->issued); + + /* progress reclaim in the allocation failure case we may be + * called under bh_disabled so we need to trigger the timer + * event directly + */ + if (time_is_before_jiffies(chan->timer.expires) + && timer_pending(&chan->timer)) { + struct ioatdma_device *device = chan->device; + + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + device->timer_fn((unsigned long) &chan->common); + } + + return -ENOMEM; +} + +struct dma_async_tx_descriptor * +ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_dma_descriptor *hw; + struct ioat_ring_ent *desc; + dma_addr_t dst = dma_dest; + dma_addr_t src = dma_src; + size_t total_len = len; + int num_descs, idx, i; + + num_descs = ioat2_xferlen_to_descs(ioat, len); + if (likely(num_descs) && ioat2_check_space_lock(ioat, num_descs) == 0) + idx = ioat->head; + else + return NULL; + i = 0; + do { + size_t copy = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + hw = desc->hw; + + hw->size = copy; + hw->ctl = 0; + hw->src_addr = src; + hw->dst_addr = dst; + + len -= copy; + dst += copy; + src += copy; + dump_desc_dbg(ioat, desc); + } while (++i < num_descs); + + desc->txd.flags = flags; + desc->len = total_len; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + hw->ctl_f.compl_write = 1; + dump_desc_dbg(ioat, desc); + /* we leave the channel locked to ensure in order submission */ + + return &desc->txd; +} + +/** + * ioat2_free_chan_resources - release all the descriptors + * @chan: the channel to be cleaned + */ +void ioat2_free_chan_resources(struct dma_chan *c) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *device = chan->device; + struct ioat_ring_ent *desc; + const u16 total_descs = 1 << ioat->alloc_order; + int descs; + int i; + + /* Before freeing channel resources first check + * if they have been previously allocated for this channel. + */ + if (!ioat->ring) + return; + + ioat_stop(chan); + device->reset_hw(chan); + + spin_lock_bh(&chan->cleanup_lock); + spin_lock_bh(&ioat->prep_lock); + descs = ioat2_ring_space(ioat); + dev_dbg(to_dev(chan), "freeing %d idle descriptors\n", descs); + for (i = 0; i < descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->head + i); + ioat2_free_ring_ent(desc, c); + } + + if (descs < total_descs) + dev_err(to_dev(chan), "Freeing %d in use descriptors!\n", + total_descs - descs); + + for (i = 0; i < total_descs - descs; i++) { + desc = ioat2_get_ring_ent(ioat, ioat->tail + i); + dump_desc_dbg(ioat, desc); + ioat2_free_ring_ent(desc, c); + } + + kfree(ioat->ring); + ioat->ring = NULL; + ioat->alloc_order = 0; + pci_pool_free(device->completion_pool, chan->completion, + chan->completion_dma); + spin_unlock_bh(&ioat->prep_lock); + spin_unlock_bh(&chan->cleanup_lock); + + chan->last_completion = 0; + chan->completion_dma = 0; + ioat->dmacount = 0; +} + +static ssize_t ring_size_show(struct dma_chan *c, char *page) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + return sprintf(page, "%d\n", (1 << ioat->alloc_order) & ~1); +} +static struct ioat_sysfs_entry ring_size_attr = __ATTR_RO(ring_size); + +static ssize_t ring_active_show(struct dma_chan *c, char *page) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + + /* ...taken outside the lock, no need to be precise */ + return sprintf(page, "%d\n", ioat2_ring_active(ioat)); +} +static struct ioat_sysfs_entry ring_active_attr = __ATTR_RO(ring_active); + +static struct attribute *ioat2_attrs[] = { + &ring_size_attr.attr, + &ring_active_attr.attr, + &ioat_cap_attr.attr, + &ioat_version_attr.attr, + NULL, +}; + +struct kobj_type ioat2_ktype = { + .sysfs_ops = &ioat_sysfs_ops, + .default_attrs = ioat2_attrs, +}; + +int ioat2_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + int err; + + device->enumerate_channels = ioat2_enumerate_channels; + device->reset_hw = ioat2_reset_hw; + device->cleanup_fn = ioat2_cleanup_event; + device->timer_fn = ioat2_timer_event; + device->self_test = ioat_dma_self_test; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + dma->device_tx_status = ioat_dma_tx_status; + + err = ioat_probe(device); + if (err) + return err; + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DCACTRL_CMPL_WRITE_ENABLE | IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + + ioat_kobject_add(device, &ioat2_ktype); + + if (dca) + device->dca = ioat2_dca_init(pdev, device->reg_base); + + return err; +} diff --git a/drivers/dma/ioat/dma_v2.h b/drivers/dma/ioat/dma_v2.h new file mode 100644 index 000000000..bf24ebe87 --- /dev/null +++ b/drivers/dma/ioat/dma_v2.h @@ -0,0 +1,175 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef IOATDMA_V2_H +#define IOATDMA_V2_H + +#include <linux/dmaengine.h> +#include <linux/circ_buf.h> +#include "dma.h" +#include "hw.h" + + +extern int ioat_pending_level; +extern int ioat_ring_alloc_order; + +/* + * workaround for IOAT ver.3.0 null descriptor issue + * (channel returns error when size is 0) + */ +#define NULL_DESC_BUFFER_SIZE 1 + +#define IOAT_MAX_ORDER 16 +#define ioat_get_alloc_order() \ + (min(ioat_ring_alloc_order, IOAT_MAX_ORDER)) +#define ioat_get_max_alloc_order() \ + (min(ioat_ring_max_alloc_order, IOAT_MAX_ORDER)) + +/* struct ioat2_dma_chan - ioat v2 / v3 channel attributes + * @base: common ioat channel parameters + * @xfercap_log; log2 of channel max transfer length (for fast division) + * @head: allocated index + * @issued: hardware notification point + * @tail: cleanup index + * @dmacount: identical to 'head' except for occasionally resetting to zero + * @alloc_order: log2 of the number of allocated descriptors + * @produce: number of descriptors to produce at submit time + * @ring: software ring buffer implementation of hardware ring + * @prep_lock: serializes descriptor preparation (producers) + */ +struct ioat2_dma_chan { + struct ioat_chan_common base; + size_t xfercap_log; + u16 head; + u16 issued; + u16 tail; + u16 dmacount; + u16 alloc_order; + u16 produce; + struct ioat_ring_ent **ring; + spinlock_t prep_lock; +}; + +static inline struct ioat2_dma_chan *to_ioat2_chan(struct dma_chan *c) +{ + struct ioat_chan_common *chan = to_chan_common(c); + + return container_of(chan, struct ioat2_dma_chan, base); +} + +static inline u32 ioat2_ring_size(struct ioat2_dma_chan *ioat) +{ + return 1 << ioat->alloc_order; +} + +/* count of descriptors in flight with the engine */ +static inline u16 ioat2_ring_active(struct ioat2_dma_chan *ioat) +{ + return CIRC_CNT(ioat->head, ioat->tail, ioat2_ring_size(ioat)); +} + +/* count of descriptors pending submission to hardware */ +static inline u16 ioat2_ring_pending(struct ioat2_dma_chan *ioat) +{ + return CIRC_CNT(ioat->head, ioat->issued, ioat2_ring_size(ioat)); +} + +static inline u32 ioat2_ring_space(struct ioat2_dma_chan *ioat) +{ + return ioat2_ring_size(ioat) - ioat2_ring_active(ioat); +} + +static inline u16 ioat2_xferlen_to_descs(struct ioat2_dma_chan *ioat, size_t len) +{ + u16 num_descs = len >> ioat->xfercap_log; + + num_descs += !!(len & ((1 << ioat->xfercap_log) - 1)); + return num_descs; +} + +/** + * struct ioat_ring_ent - wrapper around hardware descriptor + * @hw: hardware DMA descriptor (for memcpy) + * @fill: hardware fill descriptor + * @xor: hardware xor descriptor + * @xor_ex: hardware xor extension descriptor + * @pq: hardware pq descriptor + * @pq_ex: hardware pq extension descriptor + * @pqu: hardware pq update descriptor + * @raw: hardware raw (un-typed) descriptor + * @txd: the generic software descriptor for all engines + * @len: total transaction length for unmap + * @result: asynchronous result of validate operations + * @id: identifier for debug + */ + +struct ioat_ring_ent { + union { + struct ioat_dma_descriptor *hw; + struct ioat_xor_descriptor *xor; + struct ioat_xor_ext_descriptor *xor_ex; + struct ioat_pq_descriptor *pq; + struct ioat_pq_ext_descriptor *pq_ex; + struct ioat_pq_update_descriptor *pqu; + struct ioat_raw_descriptor *raw; + }; + size_t len; + struct dma_async_tx_descriptor txd; + enum sum_check_flags *result; + #ifdef DEBUG + int id; + #endif + struct ioat_sed_ent *sed; +}; + +static inline struct ioat_ring_ent * +ioat2_get_ring_ent(struct ioat2_dma_chan *ioat, u16 idx) +{ + return ioat->ring[idx & (ioat2_ring_size(ioat) - 1)]; +} + +static inline void ioat2_set_chainaddr(struct ioat2_dma_chan *ioat, u64 addr) +{ + struct ioat_chan_common *chan = &ioat->base; + + writel(addr & 0x00000000FFFFFFFF, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_LOW); + writel(addr >> 32, + chan->reg_base + IOAT2_CHAINADDR_OFFSET_HIGH); +} + +int ioat2_dma_probe(struct ioatdma_device *dev, int dca); +int ioat3_dma_probe(struct ioatdma_device *dev, int dca); +struct dca_provider *ioat2_dca_init(struct pci_dev *pdev, void __iomem *iobase); +struct dca_provider *ioat3_dca_init(struct pci_dev *pdev, void __iomem *iobase); +int ioat2_check_space_lock(struct ioat2_dma_chan *ioat, int num_descs); +int ioat2_enumerate_channels(struct ioatdma_device *device); +struct dma_async_tx_descriptor * +ioat2_dma_prep_memcpy_lock(struct dma_chan *c, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags); +void ioat2_issue_pending(struct dma_chan *chan); +int ioat2_alloc_chan_resources(struct dma_chan *c); +void ioat2_free_chan_resources(struct dma_chan *c); +void __ioat2_restart_chan(struct ioat2_dma_chan *ioat); +bool reshape_ring(struct ioat2_dma_chan *ioat, int order); +void __ioat2_issue_pending(struct ioat2_dma_chan *ioat); +void ioat2_cleanup_event(unsigned long data); +void ioat2_timer_event(unsigned long data); +int ioat2_quiesce(struct ioat_chan_common *chan, unsigned long tmo); +int ioat2_reset_sync(struct ioat_chan_common *chan, unsigned long tmo); +extern struct kobj_type ioat2_ktype; +extern struct kmem_cache *ioat2_cache; +#endif /* IOATDMA_V2_H */ diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c new file mode 100644 index 000000000..64790a45e --- /dev/null +++ b/drivers/dma/ioat/dma_v3.c @@ -0,0 +1,1717 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * BSD LICENSE + * + * Copyright(c) 2004-2009 Intel Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Support routines for v3+ hardware + */ +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/gfp.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/prefetch.h> +#include "../dmaengine.h" +#include "registers.h" +#include "hw.h" +#include "dma.h" +#include "dma_v2.h" + +extern struct kmem_cache *ioat3_sed_cache; + +/* ioat hardware assumes at least two sources for raid operations */ +#define src_cnt_to_sw(x) ((x) + 2) +#define src_cnt_to_hw(x) ((x) - 2) +#define ndest_to_sw(x) ((x) + 1) +#define ndest_to_hw(x) ((x) - 1) +#define src16_cnt_to_sw(x) ((x) + 9) +#define src16_cnt_to_hw(x) ((x) - 9) + +/* provide a lookup table for setting the source address in the base or + * extended descriptor of an xor or pq descriptor + */ +static const u8 xor_idx_to_desc = 0xe0; +static const u8 xor_idx_to_field[] = { 1, 4, 5, 6, 7, 0, 1, 2 }; +static const u8 pq_idx_to_desc = 0xf8; +static const u8 pq16_idx_to_desc[] = { 0, 0, 1, 1, 1, 1, 1, 1, 1, + 2, 2, 2, 2, 2, 2, 2 }; +static const u8 pq_idx_to_field[] = { 1, 4, 5, 0, 1, 2, 4, 5 }; +static const u8 pq16_idx_to_field[] = { 1, 4, 1, 2, 3, 4, 5, 6, 7, + 0, 1, 2, 3, 4, 5, 6 }; + +static void ioat3_eh(struct ioat2_dma_chan *ioat); + +static void xor_set_src(struct ioat_raw_descriptor *descs[2], + dma_addr_t addr, u32 offset, int idx) +{ + struct ioat_raw_descriptor *raw = descs[xor_idx_to_desc >> idx & 1]; + + raw->field[xor_idx_to_field[idx]] = addr + offset; +} + +static dma_addr_t pq_get_src(struct ioat_raw_descriptor *descs[2], int idx) +{ + struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1]; + + return raw->field[pq_idx_to_field[idx]]; +} + +static dma_addr_t pq16_get_src(struct ioat_raw_descriptor *desc[3], int idx) +{ + struct ioat_raw_descriptor *raw = desc[pq16_idx_to_desc[idx]]; + + return raw->field[pq16_idx_to_field[idx]]; +} + +static void pq_set_src(struct ioat_raw_descriptor *descs[2], + dma_addr_t addr, u32 offset, u8 coef, int idx) +{ + struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *) descs[0]; + struct ioat_raw_descriptor *raw = descs[pq_idx_to_desc >> idx & 1]; + + raw->field[pq_idx_to_field[idx]] = addr + offset; + pq->coef[idx] = coef; +} + +static bool is_jf_ioat(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_IOAT_JSF0: + case PCI_DEVICE_ID_INTEL_IOAT_JSF1: + case PCI_DEVICE_ID_INTEL_IOAT_JSF2: + case PCI_DEVICE_ID_INTEL_IOAT_JSF3: + case PCI_DEVICE_ID_INTEL_IOAT_JSF4: + case PCI_DEVICE_ID_INTEL_IOAT_JSF5: + case PCI_DEVICE_ID_INTEL_IOAT_JSF6: + case PCI_DEVICE_ID_INTEL_IOAT_JSF7: + case PCI_DEVICE_ID_INTEL_IOAT_JSF8: + case PCI_DEVICE_ID_INTEL_IOAT_JSF9: + return true; + default: + return false; + } +} + +static bool is_snb_ioat(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_IOAT_SNB0: + case PCI_DEVICE_ID_INTEL_IOAT_SNB1: + case PCI_DEVICE_ID_INTEL_IOAT_SNB2: + case PCI_DEVICE_ID_INTEL_IOAT_SNB3: + case PCI_DEVICE_ID_INTEL_IOAT_SNB4: + case PCI_DEVICE_ID_INTEL_IOAT_SNB5: + case PCI_DEVICE_ID_INTEL_IOAT_SNB6: + case PCI_DEVICE_ID_INTEL_IOAT_SNB7: + case PCI_DEVICE_ID_INTEL_IOAT_SNB8: + case PCI_DEVICE_ID_INTEL_IOAT_SNB9: + return true; + default: + return false; + } +} + +static bool is_ivb_ioat(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_IOAT_IVB0: + case PCI_DEVICE_ID_INTEL_IOAT_IVB1: + case PCI_DEVICE_ID_INTEL_IOAT_IVB2: + case PCI_DEVICE_ID_INTEL_IOAT_IVB3: + case PCI_DEVICE_ID_INTEL_IOAT_IVB4: + case PCI_DEVICE_ID_INTEL_IOAT_IVB5: + case PCI_DEVICE_ID_INTEL_IOAT_IVB6: + case PCI_DEVICE_ID_INTEL_IOAT_IVB7: + case PCI_DEVICE_ID_INTEL_IOAT_IVB8: + case PCI_DEVICE_ID_INTEL_IOAT_IVB9: + return true; + default: + return false; + } + +} + +static bool is_hsw_ioat(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_IOAT_HSW0: + case PCI_DEVICE_ID_INTEL_IOAT_HSW1: + case PCI_DEVICE_ID_INTEL_IOAT_HSW2: + case PCI_DEVICE_ID_INTEL_IOAT_HSW3: + case PCI_DEVICE_ID_INTEL_IOAT_HSW4: + case PCI_DEVICE_ID_INTEL_IOAT_HSW5: + case PCI_DEVICE_ID_INTEL_IOAT_HSW6: + case PCI_DEVICE_ID_INTEL_IOAT_HSW7: + case PCI_DEVICE_ID_INTEL_IOAT_HSW8: + case PCI_DEVICE_ID_INTEL_IOAT_HSW9: + return true; + default: + return false; + } + +} + +static bool is_xeon_cb32(struct pci_dev *pdev) +{ + return is_jf_ioat(pdev) || is_snb_ioat(pdev) || is_ivb_ioat(pdev) || + is_hsw_ioat(pdev); +} + +static bool is_bwd_ioat(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_IOAT_BWD0: + case PCI_DEVICE_ID_INTEL_IOAT_BWD1: + case PCI_DEVICE_ID_INTEL_IOAT_BWD2: + case PCI_DEVICE_ID_INTEL_IOAT_BWD3: + /* even though not Atom, BDX-DE has same DMA silicon */ + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0: + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1: + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2: + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3: + return true; + default: + return false; + } +} + +static bool is_bwd_noraid(struct pci_dev *pdev) +{ + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_IOAT_BWD2: + case PCI_DEVICE_ID_INTEL_IOAT_BWD3: + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE0: + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE1: + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE2: + case PCI_DEVICE_ID_INTEL_IOAT_BDXDE3: + return true; + default: + return false; + } + +} + +static void pq16_set_src(struct ioat_raw_descriptor *desc[3], + dma_addr_t addr, u32 offset, u8 coef, unsigned idx) +{ + struct ioat_pq_descriptor *pq = (struct ioat_pq_descriptor *)desc[0]; + struct ioat_pq16a_descriptor *pq16 = + (struct ioat_pq16a_descriptor *)desc[1]; + struct ioat_raw_descriptor *raw = desc[pq16_idx_to_desc[idx]]; + + raw->field[pq16_idx_to_field[idx]] = addr + offset; + + if (idx < 8) + pq->coef[idx] = coef; + else + pq16->coef[idx - 8] = coef; +} + +static struct ioat_sed_ent * +ioat3_alloc_sed(struct ioatdma_device *device, unsigned int hw_pool) +{ + struct ioat_sed_ent *sed; + gfp_t flags = __GFP_ZERO | GFP_ATOMIC; + + sed = kmem_cache_alloc(ioat3_sed_cache, flags); + if (!sed) + return NULL; + + sed->hw_pool = hw_pool; + sed->hw = dma_pool_alloc(device->sed_hw_pool[hw_pool], + flags, &sed->dma); + if (!sed->hw) { + kmem_cache_free(ioat3_sed_cache, sed); + return NULL; + } + + return sed; +} + +static void ioat3_free_sed(struct ioatdma_device *device, struct ioat_sed_ent *sed) +{ + if (!sed) + return; + + dma_pool_free(device->sed_hw_pool[sed->hw_pool], sed->hw, sed->dma); + kmem_cache_free(ioat3_sed_cache, sed); +} + +static bool desc_has_ext(struct ioat_ring_ent *desc) +{ + struct ioat_dma_descriptor *hw = desc->hw; + + if (hw->ctl_f.op == IOAT_OP_XOR || + hw->ctl_f.op == IOAT_OP_XOR_VAL) { + struct ioat_xor_descriptor *xor = desc->xor; + + if (src_cnt_to_sw(xor->ctl_f.src_cnt) > 5) + return true; + } else if (hw->ctl_f.op == IOAT_OP_PQ || + hw->ctl_f.op == IOAT_OP_PQ_VAL) { + struct ioat_pq_descriptor *pq = desc->pq; + + if (src_cnt_to_sw(pq->ctl_f.src_cnt) > 3) + return true; + } + + return false; +} + +static u64 ioat3_get_current_completion(struct ioat_chan_common *chan) +{ + u64 phys_complete; + u64 completion; + + completion = *chan->completion; + phys_complete = ioat_chansts_to_addr(completion); + + dev_dbg(to_dev(chan), "%s: phys_complete: %#llx\n", __func__, + (unsigned long long) phys_complete); + + return phys_complete; +} + +static bool ioat3_cleanup_preamble(struct ioat_chan_common *chan, + u64 *phys_complete) +{ + *phys_complete = ioat3_get_current_completion(chan); + if (*phys_complete == chan->last_completion) + return false; + + clear_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + + return true; +} + +static void +desc_get_errstat(struct ioat2_dma_chan *ioat, struct ioat_ring_ent *desc) +{ + struct ioat_dma_descriptor *hw = desc->hw; + + switch (hw->ctl_f.op) { + case IOAT_OP_PQ_VAL: + case IOAT_OP_PQ_VAL_16S: + { + struct ioat_pq_descriptor *pq = desc->pq; + + /* check if there's error written */ + if (!pq->dwbes_f.wbes) + return; + + /* need to set a chanerr var for checking to clear later */ + + if (pq->dwbes_f.p_val_err) + *desc->result |= SUM_CHECK_P_RESULT; + + if (pq->dwbes_f.q_val_err) + *desc->result |= SUM_CHECK_Q_RESULT; + + return; + } + default: + return; + } +} + +/** + * __cleanup - reclaim used descriptors + * @ioat: channel (ring) to clean + * + * The difference from the dma_v2.c __cleanup() is that this routine + * handles extended descriptors and dma-unmapping raid operations. + */ +static void __cleanup(struct ioat2_dma_chan *ioat, dma_addr_t phys_complete) +{ + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *device = chan->device; + struct ioat_ring_ent *desc; + bool seen_current = false; + int idx = ioat->tail, i; + u16 active; + + dev_dbg(to_dev(chan), "%s: head: %#x tail: %#x issued: %#x\n", + __func__, ioat->head, ioat->tail, ioat->issued); + + /* + * At restart of the channel, the completion address and the + * channel status will be 0 due to starting a new chain. Since + * it's new chain and the first descriptor "fails", there is + * nothing to clean up. We do not want to reap the entire submitted + * chain due to this 0 address value and then BUG. + */ + if (!phys_complete) + return; + + active = ioat2_ring_active(ioat); + for (i = 0; i < active && !seen_current; i++) { + struct dma_async_tx_descriptor *tx; + + smp_read_barrier_depends(); + prefetch(ioat2_get_ring_ent(ioat, idx + i + 1)); + desc = ioat2_get_ring_ent(ioat, idx + i); + dump_desc_dbg(ioat, desc); + + /* set err stat if we are using dwbes */ + if (device->cap & IOAT_CAP_DWBES) + desc_get_errstat(ioat, desc); + + tx = &desc->txd; + if (tx->cookie) { + dma_cookie_complete(tx); + dma_descriptor_unmap(tx); + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + + if (tx->phys == phys_complete) + seen_current = true; + + /* skip extended descriptors */ + if (desc_has_ext(desc)) { + BUG_ON(i + 1 >= active); + i++; + } + + /* cleanup super extended descriptors */ + if (desc->sed) { + ioat3_free_sed(device, desc->sed); + desc->sed = NULL; + } + } + smp_mb(); /* finish all descriptor reads before incrementing tail */ + ioat->tail = idx + i; + BUG_ON(active && !seen_current); /* no active descs have written a completion? */ + chan->last_completion = phys_complete; + + if (active - i == 0) { + dev_dbg(to_dev(chan), "%s: cancel completion timeout\n", + __func__); + clear_bit(IOAT_COMPLETION_PENDING, &chan->state); + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } + /* 5 microsecond delay per pending descriptor */ + writew(min((5 * (active - i)), IOAT_INTRDELAY_MASK), + chan->device->reg_base + IOAT_INTRDELAY_OFFSET); +} + +static void ioat3_cleanup(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + u64 phys_complete; + + spin_lock_bh(&chan->cleanup_lock); + + if (ioat3_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + + if (is_ioat_halted(*chan->completion)) { + u32 chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + + if (chanerr & IOAT_CHANERR_HANDLE_MASK) { + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + ioat3_eh(ioat); + } + } + + spin_unlock_bh(&chan->cleanup_lock); +} + +static void ioat3_cleanup_event(unsigned long data) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); + struct ioat_chan_common *chan = &ioat->base; + + ioat3_cleanup(ioat); + if (!test_bit(IOAT_RUN, &chan->state)) + return; + writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET); +} + +static void ioat3_restart_channel(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + u64 phys_complete; + + ioat2_quiesce(chan, 0); + if (ioat3_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + + __ioat2_restart_chan(ioat); +} + +static void ioat3_eh(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + struct pci_dev *pdev = to_pdev(chan); + struct ioat_dma_descriptor *hw; + struct dma_async_tx_descriptor *tx; + u64 phys_complete; + struct ioat_ring_ent *desc; + u32 err_handled = 0; + u32 chanerr_int; + u32 chanerr; + + /* cleanup so tail points to descriptor that caused the error */ + if (ioat3_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + pci_read_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, &chanerr_int); + + dev_dbg(to_dev(chan), "%s: error = %x:%x\n", + __func__, chanerr, chanerr_int); + + desc = ioat2_get_ring_ent(ioat, ioat->tail); + hw = desc->hw; + dump_desc_dbg(ioat, desc); + + switch (hw->ctl_f.op) { + case IOAT_OP_XOR_VAL: + if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) { + *desc->result |= SUM_CHECK_P_RESULT; + err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR; + } + break; + case IOAT_OP_PQ_VAL: + case IOAT_OP_PQ_VAL_16S: + if (chanerr & IOAT_CHANERR_XOR_P_OR_CRC_ERR) { + *desc->result |= SUM_CHECK_P_RESULT; + err_handled |= IOAT_CHANERR_XOR_P_OR_CRC_ERR; + } + if (chanerr & IOAT_CHANERR_XOR_Q_ERR) { + *desc->result |= SUM_CHECK_Q_RESULT; + err_handled |= IOAT_CHANERR_XOR_Q_ERR; + } + break; + } + + /* fault on unhandled error or spurious halt */ + if (chanerr ^ err_handled || chanerr == 0) { + dev_err(to_dev(chan), "%s: fatal error (%x:%x)\n", + __func__, chanerr, err_handled); + BUG(); + } else { /* cleanup the faulty descriptor */ + tx = &desc->txd; + if (tx->cookie) { + dma_cookie_complete(tx); + dma_descriptor_unmap(tx); + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + } + + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + pci_write_config_dword(pdev, IOAT_PCI_CHANERR_INT_OFFSET, chanerr_int); + + /* mark faulting descriptor as complete */ + *chan->completion = desc->txd.phys; + + spin_lock_bh(&ioat->prep_lock); + ioat3_restart_channel(ioat); + spin_unlock_bh(&ioat->prep_lock); +} + +static void check_active(struct ioat2_dma_chan *ioat) +{ + struct ioat_chan_common *chan = &ioat->base; + + if (ioat2_ring_active(ioat)) { + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + return; + } + + if (test_and_clear_bit(IOAT_CHAN_ACTIVE, &chan->state)) + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + else if (ioat->alloc_order > ioat_get_alloc_order()) { + /* if the ring is idle, empty, and oversized try to step + * down the size + */ + reshape_ring(ioat, ioat->alloc_order - 1); + + /* keep shrinking until we get back to our minimum + * default size + */ + if (ioat->alloc_order > ioat_get_alloc_order()) + mod_timer(&chan->timer, jiffies + IDLE_TIMEOUT); + } + +} + +static void ioat3_timer_event(unsigned long data) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan((void *) data); + struct ioat_chan_common *chan = &ioat->base; + dma_addr_t phys_complete; + u64 status; + + status = ioat_chansts(chan); + + /* when halted due to errors check for channel + * programming errors before advancing the completion state + */ + if (is_ioat_halted(status)) { + u32 chanerr; + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + dev_err(to_dev(chan), "%s: Channel halted (%x)\n", + __func__, chanerr); + if (test_bit(IOAT_RUN, &chan->state)) + BUG_ON(is_ioat_bug(chanerr)); + else /* we never got off the ground */ + return; + } + + /* if we haven't made progress and we have already + * acknowledged a pending completion once, then be more + * forceful with a restart + */ + spin_lock_bh(&chan->cleanup_lock); + if (ioat_cleanup_preamble(chan, &phys_complete)) + __cleanup(ioat, phys_complete); + else if (test_bit(IOAT_COMPLETION_ACK, &chan->state)) { + spin_lock_bh(&ioat->prep_lock); + ioat3_restart_channel(ioat); + spin_unlock_bh(&ioat->prep_lock); + spin_unlock_bh(&chan->cleanup_lock); + return; + } else { + set_bit(IOAT_COMPLETION_ACK, &chan->state); + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + } + + + if (ioat2_ring_active(ioat)) + mod_timer(&chan->timer, jiffies + COMPLETION_TIMEOUT); + else { + spin_lock_bh(&ioat->prep_lock); + check_active(ioat); + spin_unlock_bh(&ioat->prep_lock); + } + spin_unlock_bh(&chan->cleanup_lock); +} + +static enum dma_status +ioat3_tx_status(struct dma_chan *c, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + enum dma_status ret; + + ret = dma_cookie_status(c, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + ioat3_cleanup(ioat); + + return dma_cookie_status(c, cookie, txstate); +} + +static struct dma_async_tx_descriptor * +__ioat3_prep_xor_lock(struct dma_chan *c, enum sum_check_flags *result, + dma_addr_t dest, dma_addr_t *src, unsigned int src_cnt, + size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_ring_ent *compl_desc; + struct ioat_ring_ent *desc; + struct ioat_ring_ent *ext; + size_t total_len = len; + struct ioat_xor_descriptor *xor; + struct ioat_xor_ext_descriptor *xor_ex = NULL; + struct ioat_dma_descriptor *hw; + int num_descs, with_ext, idx, i; + u32 offset = 0; + u8 op = result ? IOAT_OP_XOR_VAL : IOAT_OP_XOR; + + BUG_ON(src_cnt < 2); + + num_descs = ioat2_xferlen_to_descs(ioat, len); + /* we need 2x the number of descriptors to cover greater than 5 + * sources + */ + if (src_cnt > 5) { + with_ext = 1; + num_descs *= 2; + } else + with_ext = 0; + + /* completion writes from the raid engine may pass completion + * writes from the legacy engine, so we need one extra null + * (legacy) descriptor to ensure all completion writes arrive in + * order. + */ + if (likely(num_descs) && ioat2_check_space_lock(ioat, num_descs+1) == 0) + idx = ioat->head; + else + return NULL; + i = 0; + do { + struct ioat_raw_descriptor *descs[2]; + size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); + int s; + + desc = ioat2_get_ring_ent(ioat, idx + i); + xor = desc->xor; + + /* save a branch by unconditionally retrieving the + * extended descriptor xor_set_src() knows to not write + * to it in the single descriptor case + */ + ext = ioat2_get_ring_ent(ioat, idx + i + 1); + xor_ex = ext->xor_ex; + + descs[0] = (struct ioat_raw_descriptor *) xor; + descs[1] = (struct ioat_raw_descriptor *) xor_ex; + for (s = 0; s < src_cnt; s++) + xor_set_src(descs, src[s], offset, s); + xor->size = xfer_size; + xor->dst_addr = dest + offset; + xor->ctl = 0; + xor->ctl_f.op = op; + xor->ctl_f.src_cnt = src_cnt_to_hw(src_cnt); + + len -= xfer_size; + offset += xfer_size; + dump_desc_dbg(ioat, desc); + } while ((i += 1 + with_ext) < num_descs); + + /* last xor descriptor carries the unmap parameters and fence bit */ + desc->txd.flags = flags; + desc->len = total_len; + if (result) + desc->result = result; + xor->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + + /* completion descriptor carries interrupt bit */ + compl_desc = ioat2_get_ring_ent(ioat, idx + i); + compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT; + hw = compl_desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + hw->size = NULL_DESC_BUFFER_SIZE; + dump_desc_dbg(ioat, compl_desc); + + /* we leave the channel locked to ensure in order submission */ + return &compl_desc->txd; +} + +static struct dma_async_tx_descriptor * +ioat3_prep_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, + unsigned int src_cnt, size_t len, unsigned long flags) +{ + return __ioat3_prep_xor_lock(chan, NULL, dest, src, src_cnt, len, flags); +} + +static struct dma_async_tx_descriptor * +ioat3_prep_xor_val(struct dma_chan *chan, dma_addr_t *src, + unsigned int src_cnt, size_t len, + enum sum_check_flags *result, unsigned long flags) +{ + /* the cleanup routine only sets bits on validate failure, it + * does not clear bits on validate success... so clear it here + */ + *result = 0; + + return __ioat3_prep_xor_lock(chan, result, src[0], &src[1], + src_cnt - 1, len, flags); +} + +static void +dump_pq_desc_dbg(struct ioat2_dma_chan *ioat, struct ioat_ring_ent *desc, struct ioat_ring_ent *ext) +{ + struct device *dev = to_dev(&ioat->base); + struct ioat_pq_descriptor *pq = desc->pq; + struct ioat_pq_ext_descriptor *pq_ex = ext ? ext->pq_ex : NULL; + struct ioat_raw_descriptor *descs[] = { (void *) pq, (void *) pq_ex }; + int src_cnt = src_cnt_to_sw(pq->ctl_f.src_cnt); + int i; + + dev_dbg(dev, "desc[%d]: (%#llx->%#llx) flags: %#x" + " sz: %#10.8x ctl: %#x (op: %#x int: %d compl: %d pq: '%s%s'" + " src_cnt: %d)\n", + desc_id(desc), (unsigned long long) desc->txd.phys, + (unsigned long long) (pq_ex ? pq_ex->next : pq->next), + desc->txd.flags, pq->size, pq->ctl, pq->ctl_f.op, pq->ctl_f.int_en, + pq->ctl_f.compl_write, + pq->ctl_f.p_disable ? "" : "p", pq->ctl_f.q_disable ? "" : "q", + pq->ctl_f.src_cnt); + for (i = 0; i < src_cnt; i++) + dev_dbg(dev, "\tsrc[%d]: %#llx coef: %#x\n", i, + (unsigned long long) pq_get_src(descs, i), pq->coef[i]); + dev_dbg(dev, "\tP: %#llx\n", pq->p_addr); + dev_dbg(dev, "\tQ: %#llx\n", pq->q_addr); + dev_dbg(dev, "\tNEXT: %#llx\n", pq->next); +} + +static void dump_pq16_desc_dbg(struct ioat2_dma_chan *ioat, + struct ioat_ring_ent *desc) +{ + struct device *dev = to_dev(&ioat->base); + struct ioat_pq_descriptor *pq = desc->pq; + struct ioat_raw_descriptor *descs[] = { (void *)pq, + (void *)pq, + (void *)pq }; + int src_cnt = src16_cnt_to_sw(pq->ctl_f.src_cnt); + int i; + + if (desc->sed) { + descs[1] = (void *)desc->sed->hw; + descs[2] = (void *)desc->sed->hw + 64; + } + + dev_dbg(dev, "desc[%d]: (%#llx->%#llx) flags: %#x" + " sz: %#x ctl: %#x (op: %#x int: %d compl: %d pq: '%s%s'" + " src_cnt: %d)\n", + desc_id(desc), (unsigned long long) desc->txd.phys, + (unsigned long long) pq->next, + desc->txd.flags, pq->size, pq->ctl, + pq->ctl_f.op, pq->ctl_f.int_en, + pq->ctl_f.compl_write, + pq->ctl_f.p_disable ? "" : "p", pq->ctl_f.q_disable ? "" : "q", + pq->ctl_f.src_cnt); + for (i = 0; i < src_cnt; i++) { + dev_dbg(dev, "\tsrc[%d]: %#llx coef: %#x\n", i, + (unsigned long long) pq16_get_src(descs, i), + pq->coef[i]); + } + dev_dbg(dev, "\tP: %#llx\n", pq->p_addr); + dev_dbg(dev, "\tQ: %#llx\n", pq->q_addr); +} + +static struct dma_async_tx_descriptor * +__ioat3_prep_pq_lock(struct dma_chan *c, enum sum_check_flags *result, + const dma_addr_t *dst, const dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *device = chan->device; + struct ioat_ring_ent *compl_desc; + struct ioat_ring_ent *desc; + struct ioat_ring_ent *ext; + size_t total_len = len; + struct ioat_pq_descriptor *pq; + struct ioat_pq_ext_descriptor *pq_ex = NULL; + struct ioat_dma_descriptor *hw; + u32 offset = 0; + u8 op = result ? IOAT_OP_PQ_VAL : IOAT_OP_PQ; + int i, s, idx, with_ext, num_descs; + int cb32 = (device->version < IOAT_VER_3_3) ? 1 : 0; + + dev_dbg(to_dev(chan), "%s\n", __func__); + /* the engine requires at least two sources (we provide + * at least 1 implied source in the DMA_PREP_CONTINUE case) + */ + BUG_ON(src_cnt + dmaf_continue(flags) < 2); + + num_descs = ioat2_xferlen_to_descs(ioat, len); + /* we need 2x the number of descriptors to cover greater than 3 + * sources (we need 1 extra source in the q-only continuation + * case and 3 extra sources in the p+q continuation case. + */ + if (src_cnt + dmaf_p_disabled_continue(flags) > 3 || + (dmaf_continue(flags) && !dmaf_p_disabled_continue(flags))) { + with_ext = 1; + num_descs *= 2; + } else + with_ext = 0; + + /* completion writes from the raid engine may pass completion + * writes from the legacy engine, so we need one extra null + * (legacy) descriptor to ensure all completion writes arrive in + * order. + */ + if (likely(num_descs) && + ioat2_check_space_lock(ioat, num_descs + cb32) == 0) + idx = ioat->head; + else + return NULL; + i = 0; + do { + struct ioat_raw_descriptor *descs[2]; + size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + pq = desc->pq; + + /* save a branch by unconditionally retrieving the + * extended descriptor pq_set_src() knows to not write + * to it in the single descriptor case + */ + ext = ioat2_get_ring_ent(ioat, idx + i + with_ext); + pq_ex = ext->pq_ex; + + descs[0] = (struct ioat_raw_descriptor *) pq; + descs[1] = (struct ioat_raw_descriptor *) pq_ex; + + for (s = 0; s < src_cnt; s++) + pq_set_src(descs, src[s], offset, scf[s], s); + + /* see the comment for dma_maxpq in include/linux/dmaengine.h */ + if (dmaf_p_disabled_continue(flags)) + pq_set_src(descs, dst[1], offset, 1, s++); + else if (dmaf_continue(flags)) { + pq_set_src(descs, dst[0], offset, 0, s++); + pq_set_src(descs, dst[1], offset, 1, s++); + pq_set_src(descs, dst[1], offset, 0, s++); + } + pq->size = xfer_size; + pq->p_addr = dst[0] + offset; + pq->q_addr = dst[1] + offset; + pq->ctl = 0; + pq->ctl_f.op = op; + /* we turn on descriptor write back error status */ + if (device->cap & IOAT_CAP_DWBES) + pq->ctl_f.wb_en = result ? 1 : 0; + pq->ctl_f.src_cnt = src_cnt_to_hw(s); + pq->ctl_f.p_disable = !!(flags & DMA_PREP_PQ_DISABLE_P); + pq->ctl_f.q_disable = !!(flags & DMA_PREP_PQ_DISABLE_Q); + + len -= xfer_size; + offset += xfer_size; + } while ((i += 1 + with_ext) < num_descs); + + /* last pq descriptor carries the unmap parameters and fence bit */ + desc->txd.flags = flags; + desc->len = total_len; + if (result) + desc->result = result; + pq->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + dump_pq_desc_dbg(ioat, desc, ext); + + if (!cb32) { + pq->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + pq->ctl_f.compl_write = 1; + compl_desc = desc; + } else { + /* completion descriptor carries interrupt bit */ + compl_desc = ioat2_get_ring_ent(ioat, idx + i); + compl_desc->txd.flags = flags & DMA_PREP_INTERRUPT; + hw = compl_desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + hw->ctl_f.compl_write = 1; + hw->size = NULL_DESC_BUFFER_SIZE; + dump_desc_dbg(ioat, compl_desc); + } + + + /* we leave the channel locked to ensure in order submission */ + return &compl_desc->txd; +} + +static struct dma_async_tx_descriptor * +__ioat3_prep_pq16_lock(struct dma_chan *c, enum sum_check_flags *result, + const dma_addr_t *dst, const dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_chan_common *chan = &ioat->base; + struct ioatdma_device *device = chan->device; + struct ioat_ring_ent *desc; + size_t total_len = len; + struct ioat_pq_descriptor *pq; + u32 offset = 0; + u8 op; + int i, s, idx, num_descs; + + /* this function is only called with 9-16 sources */ + op = result ? IOAT_OP_PQ_VAL_16S : IOAT_OP_PQ_16S; + + dev_dbg(to_dev(chan), "%s\n", __func__); + + num_descs = ioat2_xferlen_to_descs(ioat, len); + + /* + * 16 source pq is only available on cb3.3 and has no completion + * write hw bug. + */ + if (num_descs && ioat2_check_space_lock(ioat, num_descs) == 0) + idx = ioat->head; + else + return NULL; + + i = 0; + + do { + struct ioat_raw_descriptor *descs[4]; + size_t xfer_size = min_t(size_t, len, 1 << ioat->xfercap_log); + + desc = ioat2_get_ring_ent(ioat, idx + i); + pq = desc->pq; + + descs[0] = (struct ioat_raw_descriptor *) pq; + + desc->sed = ioat3_alloc_sed(device, (src_cnt-2) >> 3); + if (!desc->sed) { + dev_err(to_dev(chan), + "%s: no free sed entries\n", __func__); + return NULL; + } + + pq->sed_addr = desc->sed->dma; + desc->sed->parent = desc; + + descs[1] = (struct ioat_raw_descriptor *)desc->sed->hw; + descs[2] = (void *)descs[1] + 64; + + for (s = 0; s < src_cnt; s++) + pq16_set_src(descs, src[s], offset, scf[s], s); + + /* see the comment for dma_maxpq in include/linux/dmaengine.h */ + if (dmaf_p_disabled_continue(flags)) + pq16_set_src(descs, dst[1], offset, 1, s++); + else if (dmaf_continue(flags)) { + pq16_set_src(descs, dst[0], offset, 0, s++); + pq16_set_src(descs, dst[1], offset, 1, s++); + pq16_set_src(descs, dst[1], offset, 0, s++); + } + + pq->size = xfer_size; + pq->p_addr = dst[0] + offset; + pq->q_addr = dst[1] + offset; + pq->ctl = 0; + pq->ctl_f.op = op; + pq->ctl_f.src_cnt = src16_cnt_to_hw(s); + /* we turn on descriptor write back error status */ + if (device->cap & IOAT_CAP_DWBES) + pq->ctl_f.wb_en = result ? 1 : 0; + pq->ctl_f.p_disable = !!(flags & DMA_PREP_PQ_DISABLE_P); + pq->ctl_f.q_disable = !!(flags & DMA_PREP_PQ_DISABLE_Q); + + len -= xfer_size; + offset += xfer_size; + } while (++i < num_descs); + + /* last pq descriptor carries the unmap parameters and fence bit */ + desc->txd.flags = flags; + desc->len = total_len; + if (result) + desc->result = result; + pq->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + + /* with cb3.3 we should be able to do completion w/o a null desc */ + pq->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT); + pq->ctl_f.compl_write = 1; + + dump_pq16_desc_dbg(ioat, desc); + + /* we leave the channel locked to ensure in order submission */ + return &desc->txd; +} + +static int src_cnt_flags(unsigned int src_cnt, unsigned long flags) +{ + if (dmaf_p_disabled_continue(flags)) + return src_cnt + 1; + else if (dmaf_continue(flags)) + return src_cnt + 3; + else + return src_cnt; +} + +static struct dma_async_tx_descriptor * +ioat3_prep_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + unsigned long flags) +{ + /* specify valid address for disabled result */ + if (flags & DMA_PREP_PQ_DISABLE_P) + dst[0] = dst[1]; + if (flags & DMA_PREP_PQ_DISABLE_Q) + dst[1] = dst[0]; + + /* handle the single source multiply case from the raid6 + * recovery path + */ + if ((flags & DMA_PREP_PQ_DISABLE_P) && src_cnt == 1) { + dma_addr_t single_source[2]; + unsigned char single_source_coef[2]; + + BUG_ON(flags & DMA_PREP_PQ_DISABLE_Q); + single_source[0] = src[0]; + single_source[1] = src[0]; + single_source_coef[0] = scf[0]; + single_source_coef[1] = 0; + + return src_cnt_flags(src_cnt, flags) > 8 ? + __ioat3_prep_pq16_lock(chan, NULL, dst, single_source, + 2, single_source_coef, len, + flags) : + __ioat3_prep_pq_lock(chan, NULL, dst, single_source, 2, + single_source_coef, len, flags); + + } else { + return src_cnt_flags(src_cnt, flags) > 8 ? + __ioat3_prep_pq16_lock(chan, NULL, dst, src, src_cnt, + scf, len, flags) : + __ioat3_prep_pq_lock(chan, NULL, dst, src, src_cnt, + scf, len, flags); + } +} + +static struct dma_async_tx_descriptor * +ioat3_prep_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + enum sum_check_flags *pqres, unsigned long flags) +{ + /* specify valid address for disabled result */ + if (flags & DMA_PREP_PQ_DISABLE_P) + pq[0] = pq[1]; + if (flags & DMA_PREP_PQ_DISABLE_Q) + pq[1] = pq[0]; + + /* the cleanup routine only sets bits on validate failure, it + * does not clear bits on validate success... so clear it here + */ + *pqres = 0; + + return src_cnt_flags(src_cnt, flags) > 8 ? + __ioat3_prep_pq16_lock(chan, pqres, pq, src, src_cnt, scf, len, + flags) : + __ioat3_prep_pq_lock(chan, pqres, pq, src, src_cnt, scf, len, + flags); +} + +static struct dma_async_tx_descriptor * +ioat3_prep_pqxor(struct dma_chan *chan, dma_addr_t dst, dma_addr_t *src, + unsigned int src_cnt, size_t len, unsigned long flags) +{ + unsigned char scf[src_cnt]; + dma_addr_t pq[2]; + + memset(scf, 0, src_cnt); + pq[0] = dst; + flags |= DMA_PREP_PQ_DISABLE_Q; + pq[1] = dst; /* specify valid address for disabled result */ + + return src_cnt_flags(src_cnt, flags) > 8 ? + __ioat3_prep_pq16_lock(chan, NULL, pq, src, src_cnt, scf, len, + flags) : + __ioat3_prep_pq_lock(chan, NULL, pq, src, src_cnt, scf, len, + flags); +} + +static struct dma_async_tx_descriptor * +ioat3_prep_pqxor_val(struct dma_chan *chan, dma_addr_t *src, + unsigned int src_cnt, size_t len, + enum sum_check_flags *result, unsigned long flags) +{ + unsigned char scf[src_cnt]; + dma_addr_t pq[2]; + + /* the cleanup routine only sets bits on validate failure, it + * does not clear bits on validate success... so clear it here + */ + *result = 0; + + memset(scf, 0, src_cnt); + pq[0] = src[0]; + flags |= DMA_PREP_PQ_DISABLE_Q; + pq[1] = pq[0]; /* specify valid address for disabled result */ + + return src_cnt_flags(src_cnt, flags) > 8 ? + __ioat3_prep_pq16_lock(chan, result, pq, &src[1], src_cnt - 1, + scf, len, flags) : + __ioat3_prep_pq_lock(chan, result, pq, &src[1], src_cnt - 1, + scf, len, flags); +} + +static struct dma_async_tx_descriptor * +ioat3_prep_interrupt_lock(struct dma_chan *c, unsigned long flags) +{ + struct ioat2_dma_chan *ioat = to_ioat2_chan(c); + struct ioat_ring_ent *desc; + struct ioat_dma_descriptor *hw; + + if (ioat2_check_space_lock(ioat, 1) == 0) + desc = ioat2_get_ring_ent(ioat, ioat->head); + else + return NULL; + + hw = desc->hw; + hw->ctl = 0; + hw->ctl_f.null = 1; + hw->ctl_f.int_en = 1; + hw->ctl_f.fence = !!(flags & DMA_PREP_FENCE); + hw->ctl_f.compl_write = 1; + hw->size = NULL_DESC_BUFFER_SIZE; + hw->src_addr = 0; + hw->dst_addr = 0; + + desc->txd.flags = flags; + desc->len = 1; + + dump_desc_dbg(ioat, desc); + + /* we leave the channel locked to ensure in order submission */ + return &desc->txd; +} + +static void ioat3_dma_test_callback(void *dma_async_param) +{ + struct completion *cmp = dma_async_param; + + complete(cmp); +} + +#define IOAT_NUM_SRC_TEST 6 /* must be <= 8 */ +static int ioat_xor_val_self_test(struct ioatdma_device *device) +{ + int i, src_idx; + struct page *dest; + struct page *xor_srcs[IOAT_NUM_SRC_TEST]; + struct page *xor_val_srcs[IOAT_NUM_SRC_TEST + 1]; + dma_addr_t dma_srcs[IOAT_NUM_SRC_TEST + 1]; + dma_addr_t dest_dma; + struct dma_async_tx_descriptor *tx; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + u8 cmp_byte = 0; + u32 cmp_word; + u32 xor_val_result; + int err = 0; + struct completion cmp; + unsigned long tmo; + struct device *dev = &device->pdev->dev; + struct dma_device *dma = &device->common; + u8 op = 0; + + dev_dbg(dev, "%s\n", __func__); + + if (!dma_has_cap(DMA_XOR, dma->cap_mask)) + return 0; + + for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) { + xor_srcs[src_idx] = alloc_page(GFP_KERNEL); + if (!xor_srcs[src_idx]) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + } + + dest = alloc_page(GFP_KERNEL); + if (!dest) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + + /* Fill in src buffers */ + for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) { + u8 *ptr = page_address(xor_srcs[src_idx]); + for (i = 0; i < PAGE_SIZE; i++) + ptr[i] = (1 << src_idx); + } + + for (src_idx = 0; src_idx < IOAT_NUM_SRC_TEST; src_idx++) + cmp_byte ^= (u8) (1 << src_idx); + + cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | + (cmp_byte << 8) | cmp_byte; + + memset(page_address(dest), 0, PAGE_SIZE); + + dma_chan = container_of(dma->channels.next, struct dma_chan, + device_node); + if (dma->device_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + /* test xor */ + op = IOAT_OP_XOR; + + dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(dev, dest_dma)) + goto dma_unmap; + + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) + dma_srcs[i] = DMA_ERROR_CODE; + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) { + dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_srcs[i])) + goto dma_unmap; + } + tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs, + IOAT_NUM_SRC_TEST, PAGE_SIZE, + DMA_PREP_INTERRUPT); + + if (!tx) { + dev_err(dev, "Self-test xor prep failed\n"); + err = -ENODEV; + goto dma_unmap; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat3_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test xor setup failed\n"); + err = -ENODEV; + goto dma_unmap; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (tmo == 0 || + dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { + dev_err(dev, "Self-test xor timed out\n"); + err = -ENODEV; + goto dma_unmap; + } + + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); + + dma_sync_single_for_cpu(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { + u32 *ptr = page_address(dest); + if (ptr[i] != cmp_word) { + dev_err(dev, "Self-test xor failed compare\n"); + err = -ENODEV; + goto free_resources; + } + } + dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); + + dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); + + /* skip validate if the capability is not present */ + if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask)) + goto free_resources; + + op = IOAT_OP_XOR_VAL; + + /* validate the sources with the destintation page */ + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) + xor_val_srcs[i] = xor_srcs[i]; + xor_val_srcs[i] = dest; + + xor_val_result = 1; + + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = DMA_ERROR_CODE; + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { + dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_srcs[i])) + goto dma_unmap; + } + tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, + IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, + &xor_val_result, DMA_PREP_INTERRUPT); + if (!tx) { + dev_err(dev, "Self-test zero prep failed\n"); + err = -ENODEV; + goto dma_unmap; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat3_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test zero setup failed\n"); + err = -ENODEV; + goto dma_unmap; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (tmo == 0 || + dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { + dev_err(dev, "Self-test validate timed out\n"); + err = -ENODEV; + goto dma_unmap; + } + + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); + + if (xor_val_result != 0) { + dev_err(dev, "Self-test validate failed compare\n"); + err = -ENODEV; + goto free_resources; + } + + memset(page_address(dest), 0, PAGE_SIZE); + + /* test for non-zero parity sum */ + op = IOAT_OP_XOR_VAL; + + xor_val_result = 0; + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = DMA_ERROR_CODE; + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { + dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_srcs[i])) + goto dma_unmap; + } + tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, + IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, + &xor_val_result, DMA_PREP_INTERRUPT); + if (!tx) { + dev_err(dev, "Self-test 2nd zero prep failed\n"); + err = -ENODEV; + goto dma_unmap; + } + + async_tx_ack(tx); + init_completion(&cmp); + tx->callback = ioat3_dma_test_callback; + tx->callback_param = &cmp; + cookie = tx->tx_submit(tx); + if (cookie < 0) { + dev_err(dev, "Self-test 2nd zero setup failed\n"); + err = -ENODEV; + goto dma_unmap; + } + dma->device_issue_pending(dma_chan); + + tmo = wait_for_completion_timeout(&cmp, msecs_to_jiffies(3000)); + + if (tmo == 0 || + dma->device_tx_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { + dev_err(dev, "Self-test 2nd validate timed out\n"); + err = -ENODEV; + goto dma_unmap; + } + + if (xor_val_result != SUM_CHECK_P_RESULT) { + dev_err(dev, "Self-test validate failed compare\n"); + err = -ENODEV; + goto dma_unmap; + } + + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); + + goto free_resources; +dma_unmap: + if (op == IOAT_OP_XOR) { + if (dest_dma != DMA_ERROR_CODE) + dma_unmap_page(dev, dest_dma, PAGE_SIZE, + DMA_FROM_DEVICE); + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) + if (dma_srcs[i] != DMA_ERROR_CODE) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, + DMA_TO_DEVICE); + } else if (op == IOAT_OP_XOR_VAL) { + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + if (dma_srcs[i] != DMA_ERROR_CODE) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, + DMA_TO_DEVICE); + } +free_resources: + dma->device_free_chan_resources(dma_chan); +out: + src_idx = IOAT_NUM_SRC_TEST; + while (src_idx--) + __free_page(xor_srcs[src_idx]); + __free_page(dest); + return err; +} + +static int ioat3_dma_self_test(struct ioatdma_device *device) +{ + int rc = ioat_dma_self_test(device); + + if (rc) + return rc; + + rc = ioat_xor_val_self_test(device); + if (rc) + return rc; + + return 0; +} + +static int ioat3_irq_reinit(struct ioatdma_device *device) +{ + struct pci_dev *pdev = device->pdev; + int irq = pdev->irq, i; + + if (!is_bwd_ioat(pdev)) + return 0; + + switch (device->irq_mode) { + case IOAT_MSIX: + for (i = 0; i < device->common.chancnt; i++) { + struct msix_entry *msix = &device->msix_entries[i]; + struct ioat_chan_common *chan; + + chan = ioat_chan_by_index(device, i); + devm_free_irq(&pdev->dev, msix->vector, chan); + } + + pci_disable_msix(pdev); + break; + case IOAT_MSI: + pci_disable_msi(pdev); + /* fall through */ + case IOAT_INTX: + devm_free_irq(&pdev->dev, irq, device); + break; + default: + return 0; + } + device->irq_mode = IOAT_NOIRQ; + + return ioat_dma_setup_interrupts(device); +} + +static int ioat3_reset_hw(struct ioat_chan_common *chan) +{ + /* throw away whatever the channel was doing and get it + * initialized, with ioat3 specific workarounds + */ + struct ioatdma_device *device = chan->device; + struct pci_dev *pdev = device->pdev; + u32 chanerr; + u16 dev_id; + int err; + + ioat2_quiesce(chan, msecs_to_jiffies(100)); + + chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET); + writel(chanerr, chan->reg_base + IOAT_CHANERR_OFFSET); + + if (device->version < IOAT_VER_3_3) { + /* clear any pending errors */ + err = pci_read_config_dword(pdev, + IOAT_PCI_CHANERR_INT_OFFSET, &chanerr); + if (err) { + dev_err(&pdev->dev, + "channel error register unreachable\n"); + return err; + } + pci_write_config_dword(pdev, + IOAT_PCI_CHANERR_INT_OFFSET, chanerr); + + /* Clear DMAUNCERRSTS Cfg-Reg Parity Error status bit + * (workaround for spurious config parity error after restart) + */ + pci_read_config_word(pdev, IOAT_PCI_DEVICE_ID_OFFSET, &dev_id); + if (dev_id == PCI_DEVICE_ID_INTEL_IOAT_TBG0) { + pci_write_config_dword(pdev, + IOAT_PCI_DMAUNCERRSTS_OFFSET, + 0x10); + } + } + + err = ioat2_reset_sync(chan, msecs_to_jiffies(200)); + if (!err) + err = ioat3_irq_reinit(device); + + if (err) + dev_err(&pdev->dev, "Failed to reset: %d\n", err); + + return err; +} + +static void ioat3_intr_quirk(struct ioatdma_device *device) +{ + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + u32 errmask; + + dma = &device->common; + + /* + * if we have descriptor write back error status, we mask the + * error interrupts + */ + if (device->cap & IOAT_CAP_DWBES) { + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + errmask = readl(chan->reg_base + + IOAT_CHANERR_MASK_OFFSET); + errmask |= IOAT_CHANERR_XOR_P_OR_CRC_ERR | + IOAT_CHANERR_XOR_Q_ERR; + writel(errmask, chan->reg_base + + IOAT_CHANERR_MASK_OFFSET); + } + } +} + +int ioat3_dma_probe(struct ioatdma_device *device, int dca) +{ + struct pci_dev *pdev = device->pdev; + int dca_en = system_has_dca_enabled(pdev); + struct dma_device *dma; + struct dma_chan *c; + struct ioat_chan_common *chan; + bool is_raid_device = false; + int err; + + device->enumerate_channels = ioat2_enumerate_channels; + device->reset_hw = ioat3_reset_hw; + device->self_test = ioat3_dma_self_test; + device->intr_quirk = ioat3_intr_quirk; + dma = &device->common; + dma->device_prep_dma_memcpy = ioat2_dma_prep_memcpy_lock; + dma->device_issue_pending = ioat2_issue_pending; + dma->device_alloc_chan_resources = ioat2_alloc_chan_resources; + dma->device_free_chan_resources = ioat2_free_chan_resources; + + dma_cap_set(DMA_INTERRUPT, dma->cap_mask); + dma->device_prep_dma_interrupt = ioat3_prep_interrupt_lock; + + device->cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET); + + if (is_xeon_cb32(pdev) || is_bwd_noraid(pdev)) + device->cap &= ~(IOAT_CAP_XOR | IOAT_CAP_PQ | IOAT_CAP_RAID16SS); + + /* dca is incompatible with raid operations */ + if (dca_en && (device->cap & (IOAT_CAP_XOR|IOAT_CAP_PQ))) + device->cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ); + + if (device->cap & IOAT_CAP_XOR) { + is_raid_device = true; + dma->max_xor = 8; + + dma_cap_set(DMA_XOR, dma->cap_mask); + dma->device_prep_dma_xor = ioat3_prep_xor; + + dma_cap_set(DMA_XOR_VAL, dma->cap_mask); + dma->device_prep_dma_xor_val = ioat3_prep_xor_val; + } + + if (device->cap & IOAT_CAP_PQ) { + is_raid_device = true; + + dma->device_prep_dma_pq = ioat3_prep_pq; + dma->device_prep_dma_pq_val = ioat3_prep_pq_val; + dma_cap_set(DMA_PQ, dma->cap_mask); + dma_cap_set(DMA_PQ_VAL, dma->cap_mask); + + if (device->cap & IOAT_CAP_RAID16SS) { + dma_set_maxpq(dma, 16, 0); + } else { + dma_set_maxpq(dma, 8, 0); + } + + if (!(device->cap & IOAT_CAP_XOR)) { + dma->device_prep_dma_xor = ioat3_prep_pqxor; + dma->device_prep_dma_xor_val = ioat3_prep_pqxor_val; + dma_cap_set(DMA_XOR, dma->cap_mask); + dma_cap_set(DMA_XOR_VAL, dma->cap_mask); + + if (device->cap & IOAT_CAP_RAID16SS) { + dma->max_xor = 16; + } else { + dma->max_xor = 8; + } + } + } + + dma->device_tx_status = ioat3_tx_status; + device->cleanup_fn = ioat3_cleanup_event; + device->timer_fn = ioat3_timer_event; + + /* starting with CB3.3 super extended descriptors are supported */ + if (device->cap & IOAT_CAP_RAID16SS) { + char pool_name[14]; + int i; + + for (i = 0; i < MAX_SED_POOLS; i++) { + snprintf(pool_name, 14, "ioat_hw%d_sed", i); + + /* allocate SED DMA pool */ + device->sed_hw_pool[i] = dmam_pool_create(pool_name, + &pdev->dev, + SED_SIZE * (i + 1), 64, 0); + if (!device->sed_hw_pool[i]) + return -ENOMEM; + + } + } + + err = ioat_probe(device); + if (err) + return err; + + list_for_each_entry(c, &dma->channels, device_node) { + chan = to_chan_common(c); + writel(IOAT_DMA_DCA_ANY_CPU, + chan->reg_base + IOAT_DCACTRL_OFFSET); + } + + err = ioat_register(device); + if (err) + return err; + + ioat_kobject_add(device, &ioat2_ktype); + + if (dca) + device->dca = ioat3_dca_init(pdev, device->reg_base); + + return 0; +} diff --git a/drivers/dma/ioat/hw.h b/drivers/dma/ioat/hw.h new file mode 100644 index 000000000..a3e731edc --- /dev/null +++ b/drivers/dma/ioat/hw.h @@ -0,0 +1,270 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef _IOAT_HW_H_ +#define _IOAT_HW_H_ + +/* PCI Configuration Space Values */ +#define IOAT_MMIO_BAR 0 + +/* CB device ID's */ +#define IOAT_PCI_DID_5000 0x1A38 +#define IOAT_PCI_DID_CNB 0x360B +#define IOAT_PCI_DID_SCNB 0x65FF +#define IOAT_PCI_DID_SNB 0x402F + +#define PCI_DEVICE_ID_INTEL_IOAT_IVB0 0x0e20 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB1 0x0e21 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB2 0x0e22 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB3 0x0e23 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB4 0x0e24 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB5 0x0e25 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB6 0x0e26 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB7 0x0e27 +#define PCI_DEVICE_ID_INTEL_IOAT_IVB8 0x0e2e +#define PCI_DEVICE_ID_INTEL_IOAT_IVB9 0x0e2f + +#define PCI_DEVICE_ID_INTEL_IOAT_HSW0 0x2f20 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW1 0x2f21 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW2 0x2f22 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW3 0x2f23 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW4 0x2f24 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW5 0x2f25 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW6 0x2f26 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW7 0x2f27 +#define PCI_DEVICE_ID_INTEL_IOAT_HSW8 0x2f2e +#define PCI_DEVICE_ID_INTEL_IOAT_HSW9 0x2f2f + +#define PCI_DEVICE_ID_INTEL_IOAT_BWD0 0x0C50 +#define PCI_DEVICE_ID_INTEL_IOAT_BWD1 0x0C51 +#define PCI_DEVICE_ID_INTEL_IOAT_BWD2 0x0C52 +#define PCI_DEVICE_ID_INTEL_IOAT_BWD3 0x0C53 + +#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE0 0x6f50 +#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE1 0x6f51 +#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE2 0x6f52 +#define PCI_DEVICE_ID_INTEL_IOAT_BDXDE3 0x6f53 + +#define IOAT_VER_1_2 0x12 /* Version 1.2 */ +#define IOAT_VER_2_0 0x20 /* Version 2.0 */ +#define IOAT_VER_3_0 0x30 /* Version 3.0 */ +#define IOAT_VER_3_2 0x32 /* Version 3.2 */ +#define IOAT_VER_3_3 0x33 /* Version 3.3 */ + + +int system_has_dca_enabled(struct pci_dev *pdev); + +struct ioat_dma_descriptor { + uint32_t size; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int null:1; + unsigned int src_brk:1; + unsigned int dest_brk:1; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int rsvd2:13; + #define IOAT_OP_COPY 0x00 + unsigned int op:8; + } ctl_f; + }; + uint64_t src_addr; + uint64_t dst_addr; + uint64_t next; + uint64_t rsv1; + uint64_t rsv2; + /* store some driver data in an unused portion of the descriptor */ + union { + uint64_t user1; + uint64_t tx_cnt; + }; + uint64_t user2; +}; + +struct ioat_xor_descriptor { + uint32_t size; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int src_cnt:3; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int rsvd:13; + #define IOAT_OP_XOR 0x87 + #define IOAT_OP_XOR_VAL 0x88 + unsigned int op:8; + } ctl_f; + }; + uint64_t src_addr; + uint64_t dst_addr; + uint64_t next; + uint64_t src_addr2; + uint64_t src_addr3; + uint64_t src_addr4; + uint64_t src_addr5; +}; + +struct ioat_xor_ext_descriptor { + uint64_t src_addr6; + uint64_t src_addr7; + uint64_t src_addr8; + uint64_t next; + uint64_t rsvd[4]; +}; + +struct ioat_pq_descriptor { + union { + uint32_t size; + uint32_t dwbes; + struct { + unsigned int rsvd:25; + unsigned int p_val_err:1; + unsigned int q_val_err:1; + unsigned int rsvd1:4; + unsigned int wbes:1; + } dwbes_f; + }; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int src_cnt:3; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int p_disable:1; + unsigned int q_disable:1; + unsigned int rsvd2:2; + unsigned int wb_en:1; + unsigned int prl_en:1; + unsigned int rsvd3:7; + #define IOAT_OP_PQ 0x89 + #define IOAT_OP_PQ_VAL 0x8a + #define IOAT_OP_PQ_16S 0xa0 + #define IOAT_OP_PQ_VAL_16S 0xa1 + unsigned int op:8; + } ctl_f; + }; + uint64_t src_addr; + uint64_t p_addr; + uint64_t next; + uint64_t src_addr2; + union { + uint64_t src_addr3; + uint64_t sed_addr; + }; + uint8_t coef[8]; + uint64_t q_addr; +}; + +struct ioat_pq_ext_descriptor { + uint64_t src_addr4; + uint64_t src_addr5; + uint64_t src_addr6; + uint64_t next; + uint64_t src_addr7; + uint64_t src_addr8; + uint64_t rsvd[2]; +}; + +struct ioat_pq_update_descriptor { + uint32_t size; + union { + uint32_t ctl; + struct { + unsigned int int_en:1; + unsigned int src_snoop_dis:1; + unsigned int dest_snoop_dis:1; + unsigned int compl_write:1; + unsigned int fence:1; + unsigned int src_cnt:3; + unsigned int bundle:1; + unsigned int dest_dca:1; + unsigned int hint:1; + unsigned int p_disable:1; + unsigned int q_disable:1; + unsigned int rsvd:3; + unsigned int coef:8; + #define IOAT_OP_PQ_UP 0x8b + unsigned int op:8; + } ctl_f; + }; + uint64_t src_addr; + uint64_t p_addr; + uint64_t next; + uint64_t src_addr2; + uint64_t p_src; + uint64_t q_src; + uint64_t q_addr; +}; + +struct ioat_raw_descriptor { + uint64_t field[8]; +}; + +struct ioat_pq16a_descriptor { + uint8_t coef[8]; + uint64_t src_addr3; + uint64_t src_addr4; + uint64_t src_addr5; + uint64_t src_addr6; + uint64_t src_addr7; + uint64_t src_addr8; + uint64_t src_addr9; +}; + +struct ioat_pq16b_descriptor { + uint64_t src_addr10; + uint64_t src_addr11; + uint64_t src_addr12; + uint64_t src_addr13; + uint64_t src_addr14; + uint64_t src_addr15; + uint64_t src_addr16; + uint64_t rsvd; +}; + +union ioat_sed_pq_descriptor { + struct ioat_pq16a_descriptor a; + struct ioat_pq16b_descriptor b; +}; + +#define SED_SIZE 64 + +struct ioat_sed_raw_descriptor { + uint64_t a[8]; + uint64_t b[8]; + uint64_t c[8]; +}; + +#endif diff --git a/drivers/dma/ioat/pci.c b/drivers/dma/ioat/pci.c new file mode 100644 index 000000000..76f0dc688 --- /dev/null +++ b/drivers/dma/ioat/pci.c @@ -0,0 +1,258 @@ +/* + * Intel I/OAT DMA Linux driver + * Copyright(c) 2007 - 2009 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + */ + +/* + * This driver supports an Intel I/OAT DMA engine, which does asynchronous + * copy operations. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/interrupt.h> +#include <linux/dca.h> +#include <linux/slab.h> +#include "dma.h" +#include "dma_v2.h" +#include "registers.h" +#include "hw.h" + +MODULE_VERSION(IOAT_DMA_VERSION); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_AUTHOR("Intel Corporation"); + +static struct pci_device_id ioat_pci_tbl[] = { + /* I/OAT v1 platforms */ + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SCNB) }, + { PCI_VDEVICE(UNISYS, PCI_DEVICE_ID_UNISYS_DMA_DIRECTOR) }, + + /* I/OAT v2 platforms */ + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB) }, + + /* I/OAT v3 platforms */ + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) }, + + /* I/OAT v3.2 platforms */ + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) }, + + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) }, + + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) }, + + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) }, + + /* I/OAT v3.3 platforms */ + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) }, + + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) }, + + { 0, } +}; +MODULE_DEVICE_TABLE(pci, ioat_pci_tbl); + +static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id); +static void ioat_remove(struct pci_dev *pdev); + +static int ioat_dca_enabled = 1; +module_param(ioat_dca_enabled, int, 0644); +MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)"); + +struct kmem_cache *ioat2_cache; +struct kmem_cache *ioat3_sed_cache; + +#define DRV_NAME "ioatdma" + +static struct pci_driver ioat_pci_driver = { + .name = DRV_NAME, + .id_table = ioat_pci_tbl, + .probe = ioat_pci_probe, + .remove = ioat_remove, +}; + +static struct ioatdma_device * +alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase) +{ + struct device *dev = &pdev->dev; + struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL); + + if (!d) + return NULL; + d->pdev = pdev; + d->reg_base = iobase; + return d; +} + +static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + void __iomem * const *iomap; + struct device *dev = &pdev->dev; + struct ioatdma_device *device; + int err; + + err = pcim_enable_device(pdev); + if (err) + return err; + + err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME); + if (err) + return err; + iomap = pcim_iomap_table(pdev); + if (!iomap) + return -ENOMEM; + + err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); + if (err) + err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (err) + return err; + + err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64)); + if (err) + err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + if (err) + return err; + + device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]); + if (!device) + return -ENOMEM; + pci_set_master(pdev); + pci_set_drvdata(pdev, device); + + device->version = readb(device->reg_base + IOAT_VER_OFFSET); + if (device->version == IOAT_VER_1_2) + err = ioat1_dma_probe(device, ioat_dca_enabled); + else if (device->version == IOAT_VER_2_0) + err = ioat2_dma_probe(device, ioat_dca_enabled); + else if (device->version >= IOAT_VER_3_0) + err = ioat3_dma_probe(device, ioat_dca_enabled); + else + return -ENODEV; + + if (err) { + dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n"); + return -ENODEV; + } + + return 0; +} + +static void ioat_remove(struct pci_dev *pdev) +{ + struct ioatdma_device *device = pci_get_drvdata(pdev); + + if (!device) + return; + + dev_err(&pdev->dev, "Removing dma and dca services\n"); + if (device->dca) { + unregister_dca_provider(device->dca, &pdev->dev); + free_dca_provider(device->dca); + device->dca = NULL; + } + ioat_dma_remove(device); +} + +static int __init ioat_init_module(void) +{ + int err = -ENOMEM; + + pr_info("%s: Intel(R) QuickData Technology Driver %s\n", + DRV_NAME, IOAT_DMA_VERSION); + + ioat2_cache = kmem_cache_create("ioat2", sizeof(struct ioat_ring_ent), + 0, SLAB_HWCACHE_ALIGN, NULL); + if (!ioat2_cache) + return -ENOMEM; + + ioat3_sed_cache = KMEM_CACHE(ioat_sed_ent, 0); + if (!ioat3_sed_cache) + goto err_ioat2_cache; + + err = pci_register_driver(&ioat_pci_driver); + if (err) + goto err_ioat3_cache; + + return 0; + + err_ioat3_cache: + kmem_cache_destroy(ioat3_sed_cache); + + err_ioat2_cache: + kmem_cache_destroy(ioat2_cache); + + return err; +} +module_init(ioat_init_module); + +static void __exit ioat_exit_module(void) +{ + pci_unregister_driver(&ioat_pci_driver); + kmem_cache_destroy(ioat2_cache); +} +module_exit(ioat_exit_module); diff --git a/drivers/dma/ioat/registers.h b/drivers/dma/ioat/registers.h new file mode 100644 index 000000000..909352f74 --- /dev/null +++ b/drivers/dma/ioat/registers.h @@ -0,0 +1,249 @@ +/* + * Copyright(c) 2004 - 2009 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ +#ifndef _IOAT_REGISTERS_H_ +#define _IOAT_REGISTERS_H_ + +#define IOAT_PCI_DMACTRL_OFFSET 0x48 +#define IOAT_PCI_DMACTRL_DMA_EN 0x00000001 +#define IOAT_PCI_DMACTRL_MSI_EN 0x00000002 + +#define IOAT_PCI_DEVICE_ID_OFFSET 0x02 +#define IOAT_PCI_DMAUNCERRSTS_OFFSET 0x148 +#define IOAT_PCI_CHANERR_INT_OFFSET 0x180 +#define IOAT_PCI_CHANERRMASK_INT_OFFSET 0x184 + +/* MMIO Device Registers */ +#define IOAT_CHANCNT_OFFSET 0x00 /* 8-bit */ + +#define IOAT_XFERCAP_OFFSET 0x01 /* 8-bit */ +#define IOAT_XFERCAP_4KB 12 +#define IOAT_XFERCAP_8KB 13 +#define IOAT_XFERCAP_16KB 14 +#define IOAT_XFERCAP_32KB 15 +#define IOAT_XFERCAP_32GB 0 + +#define IOAT_GENCTRL_OFFSET 0x02 /* 8-bit */ +#define IOAT_GENCTRL_DEBUG_EN 0x01 + +#define IOAT_INTRCTRL_OFFSET 0x03 /* 8-bit */ +#define IOAT_INTRCTRL_MASTER_INT_EN 0x01 /* Master Interrupt Enable */ +#define IOAT_INTRCTRL_INT_STATUS 0x02 /* ATTNSTATUS -or- Channel Int */ +#define IOAT_INTRCTRL_INT 0x04 /* INT_STATUS -and- MASTER_INT_EN */ +#define IOAT_INTRCTRL_MSIX_VECTOR_CONTROL 0x08 /* Enable all MSI-X vectors */ + +#define IOAT_ATTNSTATUS_OFFSET 0x04 /* Each bit is a channel */ + +#define IOAT_VER_OFFSET 0x08 /* 8-bit */ +#define IOAT_VER_MAJOR_MASK 0xF0 +#define IOAT_VER_MINOR_MASK 0x0F +#define GET_IOAT_VER_MAJOR(x) (((x) & IOAT_VER_MAJOR_MASK) >> 4) +#define GET_IOAT_VER_MINOR(x) ((x) & IOAT_VER_MINOR_MASK) + +#define IOAT_PERPORTOFFSET_OFFSET 0x0A /* 16-bit */ + +#define IOAT_INTRDELAY_OFFSET 0x0C /* 16-bit */ +#define IOAT_INTRDELAY_MASK 0x3FFF /* Interrupt Delay Time */ +#define IOAT_INTRDELAY_COALESE_SUPPORT 0x8000 /* Interrupt Coalescing Supported */ + +#define IOAT_DEVICE_STATUS_OFFSET 0x0E /* 16-bit */ +#define IOAT_DEVICE_STATUS_DEGRADED_MODE 0x0001 +#define IOAT_DEVICE_MMIO_RESTRICTED 0x0002 +#define IOAT_DEVICE_MEMORY_BYPASS 0x0004 +#define IOAT_DEVICE_ADDRESS_REMAPPING 0x0008 + +#define IOAT_DMA_CAP_OFFSET 0x10 /* 32-bit */ +#define IOAT_CAP_PAGE_BREAK 0x00000001 +#define IOAT_CAP_CRC 0x00000002 +#define IOAT_CAP_SKIP_MARKER 0x00000004 +#define IOAT_CAP_DCA 0x00000010 +#define IOAT_CAP_CRC_MOVE 0x00000020 +#define IOAT_CAP_FILL_BLOCK 0x00000040 +#define IOAT_CAP_APIC 0x00000080 +#define IOAT_CAP_XOR 0x00000100 +#define IOAT_CAP_PQ 0x00000200 +#define IOAT_CAP_DWBES 0x00002000 +#define IOAT_CAP_RAID16SS 0x00020000 + +#define IOAT_CHANNEL_MMIO_SIZE 0x80 /* Each Channel MMIO space is this size */ + +/* DMA Channel Registers */ +#define IOAT_CHANCTRL_OFFSET 0x00 /* 16-bit Channel Control Register */ +#define IOAT_CHANCTRL_CHANNEL_PRIORITY_MASK 0xF000 +#define IOAT3_CHANCTRL_COMPL_DCA_EN 0x0200 +#define IOAT_CHANCTRL_CHANNEL_IN_USE 0x0100 +#define IOAT_CHANCTRL_DESCRIPTOR_ADDR_SNOOP_CONTROL 0x0020 +#define IOAT_CHANCTRL_ERR_INT_EN 0x0010 +#define IOAT_CHANCTRL_ANY_ERR_ABORT_EN 0x0008 +#define IOAT_CHANCTRL_ERR_COMPLETION_EN 0x0004 +#define IOAT_CHANCTRL_INT_REARM 0x0001 +#define IOAT_CHANCTRL_RUN (IOAT_CHANCTRL_INT_REARM |\ + IOAT_CHANCTRL_ERR_INT_EN |\ + IOAT_CHANCTRL_ERR_COMPLETION_EN |\ + IOAT_CHANCTRL_ANY_ERR_ABORT_EN) + +#define IOAT_DMA_COMP_OFFSET 0x02 /* 16-bit DMA channel compatibility */ +#define IOAT_DMA_COMP_V1 0x0001 /* Compatibility with DMA version 1 */ +#define IOAT_DMA_COMP_V2 0x0002 /* Compatibility with DMA version 2 */ + + +#define IOAT1_CHANSTS_OFFSET 0x04 /* 64-bit Channel Status Register */ +#define IOAT2_CHANSTS_OFFSET 0x08 /* 64-bit Channel Status Register */ +#define IOAT_CHANSTS_OFFSET(ver) ((ver) < IOAT_VER_2_0 \ + ? IOAT1_CHANSTS_OFFSET : IOAT2_CHANSTS_OFFSET) +#define IOAT1_CHANSTS_OFFSET_LOW 0x04 +#define IOAT2_CHANSTS_OFFSET_LOW 0x08 +#define IOAT_CHANSTS_OFFSET_LOW(ver) ((ver) < IOAT_VER_2_0 \ + ? IOAT1_CHANSTS_OFFSET_LOW : IOAT2_CHANSTS_OFFSET_LOW) +#define IOAT1_CHANSTS_OFFSET_HIGH 0x08 +#define IOAT2_CHANSTS_OFFSET_HIGH 0x0C +#define IOAT_CHANSTS_OFFSET_HIGH(ver) ((ver) < IOAT_VER_2_0 \ + ? IOAT1_CHANSTS_OFFSET_HIGH : IOAT2_CHANSTS_OFFSET_HIGH) +#define IOAT_CHANSTS_COMPLETED_DESCRIPTOR_ADDR (~0x3fULL) +#define IOAT_CHANSTS_SOFT_ERR 0x10ULL +#define IOAT_CHANSTS_UNAFFILIATED_ERR 0x8ULL +#define IOAT_CHANSTS_STATUS 0x7ULL +#define IOAT_CHANSTS_ACTIVE 0x0 +#define IOAT_CHANSTS_DONE 0x1 +#define IOAT_CHANSTS_SUSPENDED 0x2 +#define IOAT_CHANSTS_HALTED 0x3 + + + +#define IOAT_CHAN_DMACOUNT_OFFSET 0x06 /* 16-bit DMA Count register */ + +#define IOAT_DCACTRL_OFFSET 0x30 /* 32 bit Direct Cache Access Control Register */ +#define IOAT_DCACTRL_CMPL_WRITE_ENABLE 0x10000 +#define IOAT_DCACTRL_TARGET_CPU_MASK 0xFFFF /* APIC ID */ + +/* CB DCA Memory Space Registers */ +#define IOAT_DCAOFFSET_OFFSET 0x14 +/* CB_BAR + IOAT_DCAOFFSET value */ +#define IOAT_DCA_VER_OFFSET 0x00 +#define IOAT_DCA_VER_MAJOR_MASK 0xF0 +#define IOAT_DCA_VER_MINOR_MASK 0x0F + +#define IOAT_DCA_COMP_OFFSET 0x02 +#define IOAT_DCA_COMP_V1 0x1 + +#define IOAT_FSB_CAPABILITY_OFFSET 0x04 +#define IOAT_FSB_CAPABILITY_PREFETCH 0x1 + +#define IOAT_PCI_CAPABILITY_OFFSET 0x06 +#define IOAT_PCI_CAPABILITY_MEMWR 0x1 + +#define IOAT_FSB_CAP_ENABLE_OFFSET 0x08 +#define IOAT_FSB_CAP_ENABLE_PREFETCH 0x1 + +#define IOAT_PCI_CAP_ENABLE_OFFSET 0x0A +#define IOAT_PCI_CAP_ENABLE_MEMWR 0x1 + +#define IOAT_APICID_TAG_MAP_OFFSET 0x0C +#define IOAT_APICID_TAG_MAP_TAG0 0x0000000F +#define IOAT_APICID_TAG_MAP_TAG0_SHIFT 0 +#define IOAT_APICID_TAG_MAP_TAG1 0x000000F0 +#define IOAT_APICID_TAG_MAP_TAG1_SHIFT 4 +#define IOAT_APICID_TAG_MAP_TAG2 0x00000F00 +#define IOAT_APICID_TAG_MAP_TAG2_SHIFT 8 +#define IOAT_APICID_TAG_MAP_TAG3 0x0000F000 +#define IOAT_APICID_TAG_MAP_TAG3_SHIFT 12 +#define IOAT_APICID_TAG_MAP_TAG4 0x000F0000 +#define IOAT_APICID_TAG_MAP_TAG4_SHIFT 16 +#define IOAT_APICID_TAG_CB2_VALID 0x8080808080 + +#define IOAT_DCA_GREQID_OFFSET 0x10 +#define IOAT_DCA_GREQID_SIZE 0x04 +#define IOAT_DCA_GREQID_MASK 0xFFFF +#define IOAT_DCA_GREQID_IGNOREFUN 0x10000000 +#define IOAT_DCA_GREQID_VALID 0x20000000 +#define IOAT_DCA_GREQID_LASTID 0x80000000 + +#define IOAT3_CSI_CAPABILITY_OFFSET 0x08 +#define IOAT3_CSI_CAPABILITY_PREFETCH 0x1 + +#define IOAT3_PCI_CAPABILITY_OFFSET 0x0A +#define IOAT3_PCI_CAPABILITY_MEMWR 0x1 + +#define IOAT3_CSI_CONTROL_OFFSET 0x0C +#define IOAT3_CSI_CONTROL_PREFETCH 0x1 + +#define IOAT3_PCI_CONTROL_OFFSET 0x0E +#define IOAT3_PCI_CONTROL_MEMWR 0x1 + +#define IOAT3_APICID_TAG_MAP_OFFSET 0x10 +#define IOAT3_APICID_TAG_MAP_OFFSET_LOW 0x10 +#define IOAT3_APICID_TAG_MAP_OFFSET_HIGH 0x14 + +#define IOAT3_DCA_GREQID_OFFSET 0x02 + +#define IOAT1_CHAINADDR_OFFSET 0x0C /* 64-bit Descriptor Chain Address Register */ +#define IOAT2_CHAINADDR_OFFSET 0x10 /* 64-bit Descriptor Chain Address Register */ +#define IOAT_CHAINADDR_OFFSET(ver) ((ver) < IOAT_VER_2_0 \ + ? IOAT1_CHAINADDR_OFFSET : IOAT2_CHAINADDR_OFFSET) +#define IOAT1_CHAINADDR_OFFSET_LOW 0x0C +#define IOAT2_CHAINADDR_OFFSET_LOW 0x10 +#define IOAT_CHAINADDR_OFFSET_LOW(ver) ((ver) < IOAT_VER_2_0 \ + ? IOAT1_CHAINADDR_OFFSET_LOW : IOAT2_CHAINADDR_OFFSET_LOW) +#define IOAT1_CHAINADDR_OFFSET_HIGH 0x10 +#define IOAT2_CHAINADDR_OFFSET_HIGH 0x14 +#define IOAT_CHAINADDR_OFFSET_HIGH(ver) ((ver) < IOAT_VER_2_0 \ + ? IOAT1_CHAINADDR_OFFSET_HIGH : IOAT2_CHAINADDR_OFFSET_HIGH) + +#define IOAT1_CHANCMD_OFFSET 0x14 /* 8-bit DMA Channel Command Register */ +#define IOAT2_CHANCMD_OFFSET 0x04 /* 8-bit DMA Channel Command Register */ +#define IOAT_CHANCMD_OFFSET(ver) ((ver) < IOAT_VER_2_0 \ + ? IOAT1_CHANCMD_OFFSET : IOAT2_CHANCMD_OFFSET) +#define IOAT_CHANCMD_RESET 0x20 +#define IOAT_CHANCMD_RESUME 0x10 +#define IOAT_CHANCMD_ABORT 0x08 +#define IOAT_CHANCMD_SUSPEND 0x04 +#define IOAT_CHANCMD_APPEND 0x02 +#define IOAT_CHANCMD_START 0x01 + +#define IOAT_CHANCMP_OFFSET 0x18 /* 64-bit Channel Completion Address Register */ +#define IOAT_CHANCMP_OFFSET_LOW 0x18 +#define IOAT_CHANCMP_OFFSET_HIGH 0x1C + +#define IOAT_CDAR_OFFSET 0x20 /* 64-bit Current Descriptor Address Register */ +#define IOAT_CDAR_OFFSET_LOW 0x20 +#define IOAT_CDAR_OFFSET_HIGH 0x24 + +#define IOAT_CHANERR_OFFSET 0x28 /* 32-bit Channel Error Register */ +#define IOAT_CHANERR_SRC_ADDR_ERR 0x0001 +#define IOAT_CHANERR_DEST_ADDR_ERR 0x0002 +#define IOAT_CHANERR_NEXT_ADDR_ERR 0x0004 +#define IOAT_CHANERR_NEXT_DESC_ALIGN_ERR 0x0008 +#define IOAT_CHANERR_CHAIN_ADDR_VALUE_ERR 0x0010 +#define IOAT_CHANERR_CHANCMD_ERR 0x0020 +#define IOAT_CHANERR_CHIPSET_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0040 +#define IOAT_CHANERR_DMA_UNCORRECTABLE_DATA_INTEGRITY_ERR 0x0080 +#define IOAT_CHANERR_READ_DATA_ERR 0x0100 +#define IOAT_CHANERR_WRITE_DATA_ERR 0x0200 +#define IOAT_CHANERR_CONTROL_ERR 0x0400 +#define IOAT_CHANERR_LENGTH_ERR 0x0800 +#define IOAT_CHANERR_COMPLETION_ADDR_ERR 0x1000 +#define IOAT_CHANERR_INT_CONFIGURATION_ERR 0x2000 +#define IOAT_CHANERR_SOFT_ERR 0x4000 +#define IOAT_CHANERR_UNAFFILIATED_ERR 0x8000 +#define IOAT_CHANERR_XOR_P_OR_CRC_ERR 0x10000 +#define IOAT_CHANERR_XOR_Q_ERR 0x20000 +#define IOAT_CHANERR_DESCRIPTOR_COUNT_ERR 0x40000 + +#define IOAT_CHANERR_HANDLE_MASK (IOAT_CHANERR_XOR_P_OR_CRC_ERR | IOAT_CHANERR_XOR_Q_ERR) + +#define IOAT_CHANERR_MASK_OFFSET 0x2C /* 32-bit Channel Error Register */ + +#endif /* _IOAT_REGISTERS_H_ */ diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c new file mode 100644 index 000000000..998826854 --- /dev/null +++ b/drivers/dma/iop-adma.c @@ -0,0 +1,1565 @@ +/* + * offload engine driver for the Intel Xscale series of i/o processors + * Copyright © 2006, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + */ + +/* + * This driver supports the asynchrounous DMA copy and RAID engines available + * on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/memory.h> +#include <linux/ioport.h> +#include <linux/raid/pq.h> +#include <linux/slab.h> + +#include <mach/adma.h> + +#include "dmaengine.h" + +#define to_iop_adma_chan(chan) container_of(chan, struct iop_adma_chan, common) +#define to_iop_adma_device(dev) \ + container_of(dev, struct iop_adma_device, common) +#define tx_to_iop_adma_slot(tx) \ + container_of(tx, struct iop_adma_desc_slot, async_tx) + +/** + * iop_adma_free_slots - flags descriptor slots for reuse + * @slot: Slot to free + * Caller must hold &iop_chan->lock while calling this function + */ +static void iop_adma_free_slots(struct iop_adma_desc_slot *slot) +{ + int stride = slot->slots_per_op; + + while (stride--) { + slot->slots_per_op = 0; + slot = list_entry(slot->slot_node.next, + struct iop_adma_desc_slot, + slot_node); + } +} + +static dma_cookie_t +iop_adma_run_tx_complete_actions(struct iop_adma_desc_slot *desc, + struct iop_adma_chan *iop_chan, dma_cookie_t cookie) +{ + struct dma_async_tx_descriptor *tx = &desc->async_tx; + + BUG_ON(tx->cookie < 0); + if (tx->cookie > 0) { + cookie = tx->cookie; + tx->cookie = 0; + + /* call the callback (must not sleep or submit new + * operations to this channel) + */ + if (tx->callback) + tx->callback(tx->callback_param); + + dma_descriptor_unmap(tx); + if (desc->group_head) + desc->group_head = NULL; + } + + /* run dependent operations */ + dma_run_dependencies(tx); + + return cookie; +} + +static int +iop_adma_clean_slot(struct iop_adma_desc_slot *desc, + struct iop_adma_chan *iop_chan) +{ + /* the client is allowed to attach dependent operations + * until 'ack' is set + */ + if (!async_tx_test_ack(&desc->async_tx)) + return 0; + + /* leave the last descriptor in the chain + * so we can append to it + */ + if (desc->chain_node.next == &iop_chan->chain) + return 1; + + dev_dbg(iop_chan->device->common.dev, + "\tfree slot: %d slots_per_op: %d\n", + desc->idx, desc->slots_per_op); + + list_del(&desc->chain_node); + iop_adma_free_slots(desc); + + return 0; +} + +static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) +{ + struct iop_adma_desc_slot *iter, *_iter, *grp_start = NULL; + dma_cookie_t cookie = 0; + u32 current_desc = iop_chan_get_current_descriptor(iop_chan); + int busy = iop_chan_is_busy(iop_chan); + int seen_current = 0, slot_cnt = 0, slots_per_op = 0; + + dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); + /* free completed slots from the chain starting with + * the oldest descriptor + */ + list_for_each_entry_safe(iter, _iter, &iop_chan->chain, + chain_node) { + pr_debug("\tcookie: %d slot: %d busy: %d " + "this_desc: %#x next_desc: %#x ack: %d\n", + iter->async_tx.cookie, iter->idx, busy, + iter->async_tx.phys, iop_desc_get_next_desc(iter), + async_tx_test_ack(&iter->async_tx)); + prefetch(_iter); + prefetch(&_iter->async_tx); + + /* do not advance past the current descriptor loaded into the + * hardware channel, subsequent descriptors are either in + * process or have not been submitted + */ + if (seen_current) + break; + + /* stop the search if we reach the current descriptor and the + * channel is busy, or if it appears that the current descriptor + * needs to be re-read (i.e. has been appended to) + */ + if (iter->async_tx.phys == current_desc) { + BUG_ON(seen_current++); + if (busy || iop_desc_get_next_desc(iter)) + break; + } + + /* detect the start of a group transaction */ + if (!slot_cnt && !slots_per_op) { + slot_cnt = iter->slot_cnt; + slots_per_op = iter->slots_per_op; + if (slot_cnt <= slots_per_op) { + slot_cnt = 0; + slots_per_op = 0; + } + } + + if (slot_cnt) { + pr_debug("\tgroup++\n"); + if (!grp_start) + grp_start = iter; + slot_cnt -= slots_per_op; + } + + /* all the members of a group are complete */ + if (slots_per_op != 0 && slot_cnt == 0) { + struct iop_adma_desc_slot *grp_iter, *_grp_iter; + int end_of_chain = 0; + pr_debug("\tgroup end\n"); + + /* collect the total results */ + if (grp_start->xor_check_result) { + u32 zero_sum_result = 0; + slot_cnt = grp_start->slot_cnt; + grp_iter = grp_start; + + list_for_each_entry_from(grp_iter, + &iop_chan->chain, chain_node) { + zero_sum_result |= + iop_desc_get_zero_result(grp_iter); + pr_debug("\titer%d result: %d\n", + grp_iter->idx, zero_sum_result); + slot_cnt -= slots_per_op; + if (slot_cnt == 0) + break; + } + pr_debug("\tgrp_start->xor_check_result: %p\n", + grp_start->xor_check_result); + *grp_start->xor_check_result = zero_sum_result; + } + + /* clean up the group */ + slot_cnt = grp_start->slot_cnt; + grp_iter = grp_start; + list_for_each_entry_safe_from(grp_iter, _grp_iter, + &iop_chan->chain, chain_node) { + cookie = iop_adma_run_tx_complete_actions( + grp_iter, iop_chan, cookie); + + slot_cnt -= slots_per_op; + end_of_chain = iop_adma_clean_slot(grp_iter, + iop_chan); + + if (slot_cnt == 0 || end_of_chain) + break; + } + + /* the group should be complete at this point */ + BUG_ON(slot_cnt); + + slots_per_op = 0; + grp_start = NULL; + if (end_of_chain) + break; + else + continue; + } else if (slots_per_op) /* wait for group completion */ + continue; + + /* write back zero sum results (single descriptor case) */ + if (iter->xor_check_result && iter->async_tx.cookie) + *iter->xor_check_result = + iop_desc_get_zero_result(iter); + + cookie = iop_adma_run_tx_complete_actions( + iter, iop_chan, cookie); + + if (iop_adma_clean_slot(iter, iop_chan)) + break; + } + + if (cookie > 0) { + iop_chan->common.completed_cookie = cookie; + pr_debug("\tcompleted cookie %d\n", cookie); + } +} + +static void +iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan) +{ + spin_lock_bh(&iop_chan->lock); + __iop_adma_slot_cleanup(iop_chan); + spin_unlock_bh(&iop_chan->lock); +} + +static void iop_adma_tasklet(unsigned long data) +{ + struct iop_adma_chan *iop_chan = (struct iop_adma_chan *) data; + + /* lockdep will flag depedency submissions as potentially + * recursive locking, this is not the case as a dependency + * submission will never recurse a channels submit routine. + * There are checks in async_tx.c to prevent this. + */ + spin_lock_nested(&iop_chan->lock, SINGLE_DEPTH_NESTING); + __iop_adma_slot_cleanup(iop_chan); + spin_unlock(&iop_chan->lock); +} + +static struct iop_adma_desc_slot * +iop_adma_alloc_slots(struct iop_adma_chan *iop_chan, int num_slots, + int slots_per_op) +{ + struct iop_adma_desc_slot *iter, *_iter, *alloc_start = NULL; + LIST_HEAD(chain); + int slots_found, retry = 0; + + /* start search from the last allocated descrtiptor + * if a contiguous allocation can not be found start searching + * from the beginning of the list + */ +retry: + slots_found = 0; + if (retry == 0) + iter = iop_chan->last_used; + else + iter = list_entry(&iop_chan->all_slots, + struct iop_adma_desc_slot, + slot_node); + + list_for_each_entry_safe_continue( + iter, _iter, &iop_chan->all_slots, slot_node) { + prefetch(_iter); + prefetch(&_iter->async_tx); + if (iter->slots_per_op) { + /* give up after finding the first busy slot + * on the second pass through the list + */ + if (retry) + break; + + slots_found = 0; + continue; + } + + /* start the allocation if the slot is correctly aligned */ + if (!slots_found++) { + if (iop_desc_is_aligned(iter, slots_per_op)) + alloc_start = iter; + else { + slots_found = 0; + continue; + } + } + + if (slots_found == num_slots) { + struct iop_adma_desc_slot *alloc_tail = NULL; + struct iop_adma_desc_slot *last_used = NULL; + iter = alloc_start; + while (num_slots) { + int i; + dev_dbg(iop_chan->device->common.dev, + "allocated slot: %d " + "(desc %p phys: %#x) slots_per_op %d\n", + iter->idx, iter->hw_desc, + iter->async_tx.phys, slots_per_op); + + /* pre-ack all but the last descriptor */ + if (num_slots != slots_per_op) + async_tx_ack(&iter->async_tx); + + list_add_tail(&iter->chain_node, &chain); + alloc_tail = iter; + iter->async_tx.cookie = 0; + iter->slot_cnt = num_slots; + iter->xor_check_result = NULL; + for (i = 0; i < slots_per_op; i++) { + iter->slots_per_op = slots_per_op - i; + last_used = iter; + iter = list_entry(iter->slot_node.next, + struct iop_adma_desc_slot, + slot_node); + } + num_slots -= slots_per_op; + } + alloc_tail->group_head = alloc_start; + alloc_tail->async_tx.cookie = -EBUSY; + list_splice(&chain, &alloc_tail->tx_list); + iop_chan->last_used = last_used; + iop_desc_clear_next_desc(alloc_start); + iop_desc_clear_next_desc(alloc_tail); + return alloc_tail; + } + } + if (!retry++) + goto retry; + + /* perform direct reclaim if the allocation fails */ + __iop_adma_slot_cleanup(iop_chan); + + return NULL; +} + +static void iop_adma_check_threshold(struct iop_adma_chan *iop_chan) +{ + dev_dbg(iop_chan->device->common.dev, "pending: %d\n", + iop_chan->pending); + + if (iop_chan->pending >= IOP_ADMA_THRESHOLD) { + iop_chan->pending = 0; + iop_chan_append(iop_chan); + } +} + +static dma_cookie_t +iop_adma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct iop_adma_desc_slot *sw_desc = tx_to_iop_adma_slot(tx); + struct iop_adma_chan *iop_chan = to_iop_adma_chan(tx->chan); + struct iop_adma_desc_slot *grp_start, *old_chain_tail; + int slot_cnt; + int slots_per_op; + dma_cookie_t cookie; + dma_addr_t next_dma; + + grp_start = sw_desc->group_head; + slot_cnt = grp_start->slot_cnt; + slots_per_op = grp_start->slots_per_op; + + spin_lock_bh(&iop_chan->lock); + cookie = dma_cookie_assign(tx); + + old_chain_tail = list_entry(iop_chan->chain.prev, + struct iop_adma_desc_slot, chain_node); + list_splice_init(&sw_desc->tx_list, + &old_chain_tail->chain_node); + + /* fix up the hardware chain */ + next_dma = grp_start->async_tx.phys; + iop_desc_set_next_desc(old_chain_tail, next_dma); + BUG_ON(iop_desc_get_next_desc(old_chain_tail) != next_dma); /* flush */ + + /* check for pre-chained descriptors */ + iop_paranoia(iop_desc_get_next_desc(sw_desc)); + + /* increment the pending count by the number of slots + * memcpy operations have a 1:1 (slot:operation) relation + * other operations are heavier and will pop the threshold + * more often. + */ + iop_chan->pending += slot_cnt; + iop_adma_check_threshold(iop_chan); + spin_unlock_bh(&iop_chan->lock); + + dev_dbg(iop_chan->device->common.dev, "%s cookie: %d slot: %d\n", + __func__, sw_desc->async_tx.cookie, sw_desc->idx); + + return cookie; +} + +static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan); +static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan); + +/** + * iop_adma_alloc_chan_resources - returns the number of allocated descriptors + * @chan - allocate descriptor resources for this channel + * @client - current client requesting the channel be ready for requests + * + * Note: We keep the slots for 1 operation on iop_chan->chain at all times. To + * avoid deadlock, via async_xor, num_descs_in_pool must at a minimum be + * greater than 2x the number slots needed to satisfy a device->max_xor + * request. + * */ +static int iop_adma_alloc_chan_resources(struct dma_chan *chan) +{ + char *hw_desc; + int idx; + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *slot = NULL; + int init = iop_chan->slots_allocated ? 0 : 1; + struct iop_adma_platform_data *plat_data = + dev_get_platdata(&iop_chan->device->pdev->dev); + int num_descs_in_pool = plat_data->pool_size/IOP_ADMA_SLOT_SIZE; + + /* Allocate descriptor slots */ + do { + idx = iop_chan->slots_allocated; + if (idx == num_descs_in_pool) + break; + + slot = kzalloc(sizeof(*slot), GFP_KERNEL); + if (!slot) { + printk(KERN_INFO "IOP ADMA Channel only initialized" + " %d descriptor slots", idx); + break; + } + hw_desc = (char *) iop_chan->device->dma_desc_pool_virt; + slot->hw_desc = (void *) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; + + dma_async_tx_descriptor_init(&slot->async_tx, chan); + slot->async_tx.tx_submit = iop_adma_tx_submit; + INIT_LIST_HEAD(&slot->tx_list); + INIT_LIST_HEAD(&slot->chain_node); + INIT_LIST_HEAD(&slot->slot_node); + hw_desc = (char *) iop_chan->device->dma_desc_pool; + slot->async_tx.phys = + (dma_addr_t) &hw_desc[idx * IOP_ADMA_SLOT_SIZE]; + slot->idx = idx; + + spin_lock_bh(&iop_chan->lock); + iop_chan->slots_allocated++; + list_add_tail(&slot->slot_node, &iop_chan->all_slots); + spin_unlock_bh(&iop_chan->lock); + } while (iop_chan->slots_allocated < num_descs_in_pool); + + if (idx && !iop_chan->last_used) + iop_chan->last_used = list_entry(iop_chan->all_slots.next, + struct iop_adma_desc_slot, + slot_node); + + dev_dbg(iop_chan->device->common.dev, + "allocated %d descriptor slots last_used: %p\n", + iop_chan->slots_allocated, iop_chan->last_used); + + /* initialize the channel and the chain with a null operation */ + if (init) { + if (dma_has_cap(DMA_MEMCPY, + iop_chan->device->common.cap_mask)) + iop_chan_start_null_memcpy(iop_chan); + else if (dma_has_cap(DMA_XOR, + iop_chan->device->common.cap_mask)) + iop_chan_start_null_xor(iop_chan); + else + BUG(); + } + + return (idx > 0) ? idx : -ENOMEM; +} + +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *grp_start; + int slot_cnt, slots_per_op; + + dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_interrupt_slot_count(&slots_per_op, iop_chan); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + grp_start = sw_desc->group_head; + iop_desc_init_interrupt(grp_start, iop_chan); + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *grp_start; + int slot_cnt, slots_per_op; + + if (unlikely(!len)) + return NULL; + BUG_ON(len > IOP_ADMA_MAX_BYTE_COUNT); + + dev_dbg(iop_chan->device->common.dev, "%s len: %u\n", + __func__, len); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_memcpy_slot_count(len, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + grp_start = sw_desc->group_head; + iop_desc_init_memcpy(grp_start, flags); + iop_desc_set_byte_count(grp_start, iop_chan, len); + iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); + iop_desc_set_memcpy_src_addr(grp_start, dma_src); + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_xor(struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t *dma_src, unsigned int src_cnt, size_t len, + unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *grp_start; + int slot_cnt, slots_per_op; + + if (unlikely(!len)) + return NULL; + BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT); + + dev_dbg(iop_chan->device->common.dev, + "%s src_cnt: %d len: %u flags: %lx\n", + __func__, src_cnt, len, flags); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_xor_slot_count(len, src_cnt, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + grp_start = sw_desc->group_head; + iop_desc_init_xor(grp_start, src_cnt, flags); + iop_desc_set_byte_count(grp_start, iop_chan, len); + iop_desc_set_dest_addr(grp_start, iop_chan, dma_dest); + sw_desc->async_tx.flags = flags; + while (src_cnt--) + iop_desc_set_xor_src_addr(grp_start, src_cnt, + dma_src[src_cnt]); + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_xor_val(struct dma_chan *chan, dma_addr_t *dma_src, + unsigned int src_cnt, size_t len, u32 *result, + unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *grp_start; + int slot_cnt, slots_per_op; + + if (unlikely(!len)) + return NULL; + + dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n", + __func__, src_cnt, len); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_zero_sum_slot_count(len, src_cnt, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + grp_start = sw_desc->group_head; + iop_desc_init_zero_sum(grp_start, src_cnt, flags); + iop_desc_set_zero_sum_byte_count(grp_start, len); + grp_start->xor_check_result = result; + pr_debug("\t%s: grp_start->xor_check_result: %p\n", + __func__, grp_start->xor_check_result); + sw_desc->async_tx.flags = flags; + while (src_cnt--) + iop_desc_set_zero_sum_src_addr(grp_start, src_cnt, + dma_src[src_cnt]); + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_pq(struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *g; + int slot_cnt, slots_per_op; + int continue_srcs; + + if (unlikely(!len)) + return NULL; + BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT); + + dev_dbg(iop_chan->device->common.dev, + "%s src_cnt: %d len: %u flags: %lx\n", + __func__, src_cnt, len, flags); + + if (dmaf_p_disabled_continue(flags)) + continue_srcs = 1+src_cnt; + else if (dmaf_continue(flags)) + continue_srcs = 3+src_cnt; + else + continue_srcs = 0+src_cnt; + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_pq_slot_count(len, continue_srcs, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + int i; + + g = sw_desc->group_head; + iop_desc_set_byte_count(g, iop_chan, len); + + /* even if P is disabled its destination address (bits + * [3:0]) must match Q. It is ok if P points to an + * invalid address, it won't be written. + */ + if (flags & DMA_PREP_PQ_DISABLE_P) + dst[0] = dst[1] & 0x7; + + iop_desc_set_pq_addr(g, dst); + sw_desc->async_tx.flags = flags; + for (i = 0; i < src_cnt; i++) + iop_desc_set_pq_src_addr(g, i, src[i], scf[i]); + + /* if we are continuing a previous operation factor in + * the old p and q values, see the comment for dma_maxpq + * in include/linux/dmaengine.h + */ + if (dmaf_p_disabled_continue(flags)) + iop_desc_set_pq_src_addr(g, i++, dst[1], 1); + else if (dmaf_continue(flags)) { + iop_desc_set_pq_src_addr(g, i++, dst[0], 0); + iop_desc_set_pq_src_addr(g, i++, dst[1], 1); + iop_desc_set_pq_src_addr(g, i++, dst[1], 0); + } + iop_desc_init_pq(g, i, flags); + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +iop_adma_prep_dma_pq_val(struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, enum sum_check_flags *pqres, + unsigned long flags) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *sw_desc, *g; + int slot_cnt, slots_per_op; + + if (unlikely(!len)) + return NULL; + BUG_ON(len > IOP_ADMA_XOR_MAX_BYTE_COUNT); + + dev_dbg(iop_chan->device->common.dev, "%s src_cnt: %d len: %u\n", + __func__, src_cnt, len); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_pq_zero_sum_slot_count(len, src_cnt + 2, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + /* for validate operations p and q are tagged onto the + * end of the source list + */ + int pq_idx = src_cnt; + + g = sw_desc->group_head; + iop_desc_init_pq_zero_sum(g, src_cnt+2, flags); + iop_desc_set_pq_zero_sum_byte_count(g, len); + g->pq_check_result = pqres; + pr_debug("\t%s: g->pq_check_result: %p\n", + __func__, g->pq_check_result); + sw_desc->async_tx.flags = flags; + while (src_cnt--) + iop_desc_set_pq_zero_sum_src_addr(g, src_cnt, + src[src_cnt], + scf[src_cnt]); + iop_desc_set_pq_zero_sum_addr(g, pq_idx, src); + } + spin_unlock_bh(&iop_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static void iop_adma_free_chan_resources(struct dma_chan *chan) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + struct iop_adma_desc_slot *iter, *_iter; + int in_use_descs = 0; + + iop_adma_slot_cleanup(iop_chan); + + spin_lock_bh(&iop_chan->lock); + list_for_each_entry_safe(iter, _iter, &iop_chan->chain, + chain_node) { + in_use_descs++; + list_del(&iter->chain_node); + } + list_for_each_entry_safe_reverse( + iter, _iter, &iop_chan->all_slots, slot_node) { + list_del(&iter->slot_node); + kfree(iter); + iop_chan->slots_allocated--; + } + iop_chan->last_used = NULL; + + dev_dbg(iop_chan->device->common.dev, "%s slots_allocated %d\n", + __func__, iop_chan->slots_allocated); + spin_unlock_bh(&iop_chan->lock); + + /* one is ok since we left it on there on purpose */ + if (in_use_descs > 1) + printk(KERN_ERR "IOP: Freeing %d in use descriptors!\n", + in_use_descs - 1); +} + +/** + * iop_adma_status - poll the status of an ADMA transaction + * @chan: ADMA channel handle + * @cookie: ADMA transaction identifier + * @txstate: a holder for the current state of the channel or NULL + */ +static enum dma_status iop_adma_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + int ret; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + iop_adma_slot_cleanup(iop_chan); + + return dma_cookie_status(chan, cookie, txstate); +} + +static irqreturn_t iop_adma_eot_handler(int irq, void *data) +{ + struct iop_adma_chan *chan = data; + + dev_dbg(chan->device->common.dev, "%s\n", __func__); + + tasklet_schedule(&chan->irq_tasklet); + + iop_adma_device_clear_eot_status(chan); + + return IRQ_HANDLED; +} + +static irqreturn_t iop_adma_eoc_handler(int irq, void *data) +{ + struct iop_adma_chan *chan = data; + + dev_dbg(chan->device->common.dev, "%s\n", __func__); + + tasklet_schedule(&chan->irq_tasklet); + + iop_adma_device_clear_eoc_status(chan); + + return IRQ_HANDLED; +} + +static irqreturn_t iop_adma_err_handler(int irq, void *data) +{ + struct iop_adma_chan *chan = data; + unsigned long status = iop_chan_get_status(chan); + + dev_err(chan->device->common.dev, + "error ( %s%s%s%s%s%s%s)\n", + iop_is_err_int_parity(status, chan) ? "int_parity " : "", + iop_is_err_mcu_abort(status, chan) ? "mcu_abort " : "", + iop_is_err_int_tabort(status, chan) ? "int_tabort " : "", + iop_is_err_int_mabort(status, chan) ? "int_mabort " : "", + iop_is_err_pci_tabort(status, chan) ? "pci_tabort " : "", + iop_is_err_pci_mabort(status, chan) ? "pci_mabort " : "", + iop_is_err_split_tx(status, chan) ? "split_tx " : ""); + + iop_adma_device_clear_err_status(chan); + + BUG(); + + return IRQ_HANDLED; +} + +static void iop_adma_issue_pending(struct dma_chan *chan) +{ + struct iop_adma_chan *iop_chan = to_iop_adma_chan(chan); + + if (iop_chan->pending) { + iop_chan->pending = 0; + iop_chan_append(iop_chan); + } +} + +/* + * Perform a transaction to verify the HW works. + */ +#define IOP_ADMA_TEST_SIZE 2000 + +static int iop_adma_memcpy_self_test(struct iop_adma_device *device) +{ + int i; + void *src, *dest; + dma_addr_t src_dma, dest_dma; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + struct dma_async_tx_descriptor *tx; + int err = 0; + struct iop_adma_chan *iop_chan; + + dev_dbg(device->common.dev, "%s\n", __func__); + + src = kmalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL); + if (!src) + return -ENOMEM; + dest = kzalloc(IOP_ADMA_TEST_SIZE, GFP_KERNEL); + if (!dest) { + kfree(src); + return -ENOMEM; + } + + /* Fill in src buffer */ + for (i = 0; i < IOP_ADMA_TEST_SIZE; i++) + ((u8 *) src)[i] = (u8)i; + + /* Start copy, using first DMA channel */ + dma_chan = container_of(device->common.channels.next, + struct dma_chan, + device_node); + if (iop_adma_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + dest_dma = dma_map_single(dma_chan->device->dev, dest, + IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); + src_dma = dma_map_single(dma_chan->device->dev, src, + IOP_ADMA_TEST_SIZE, DMA_TO_DEVICE); + tx = iop_adma_prep_dma_memcpy(dma_chan, dest_dma, src_dma, + IOP_ADMA_TEST_SIZE, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(1); + + if (iop_adma_status(dma_chan, cookie, NULL) != + DMA_COMPLETE) { + dev_err(dma_chan->device->dev, + "Self-test copy timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + iop_chan = to_iop_adma_chan(dma_chan); + dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, + IOP_ADMA_TEST_SIZE, DMA_FROM_DEVICE); + if (memcmp(src, dest, IOP_ADMA_TEST_SIZE)) { + dev_err(dma_chan->device->dev, + "Self-test copy failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + +free_resources: + iop_adma_free_chan_resources(dma_chan); +out: + kfree(src); + kfree(dest); + return err; +} + +#define IOP_ADMA_NUM_SRC_TEST 4 /* must be <= 15 */ +static int +iop_adma_xor_val_self_test(struct iop_adma_device *device) +{ + int i, src_idx; + struct page *dest; + struct page *xor_srcs[IOP_ADMA_NUM_SRC_TEST]; + struct page *zero_sum_srcs[IOP_ADMA_NUM_SRC_TEST + 1]; + dma_addr_t dma_srcs[IOP_ADMA_NUM_SRC_TEST + 1]; + dma_addr_t dest_dma; + struct dma_async_tx_descriptor *tx; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + u8 cmp_byte = 0; + u32 cmp_word; + u32 zero_sum_result; + int err = 0; + struct iop_adma_chan *iop_chan; + + dev_dbg(device->common.dev, "%s\n", __func__); + + for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { + xor_srcs[src_idx] = alloc_page(GFP_KERNEL); + if (!xor_srcs[src_idx]) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + } + + dest = alloc_page(GFP_KERNEL); + if (!dest) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + + /* Fill in src buffers */ + for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) { + u8 *ptr = page_address(xor_srcs[src_idx]); + for (i = 0; i < PAGE_SIZE; i++) + ptr[i] = (1 << src_idx); + } + + for (src_idx = 0; src_idx < IOP_ADMA_NUM_SRC_TEST; src_idx++) + cmp_byte ^= (u8) (1 << src_idx); + + cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | + (cmp_byte << 8) | cmp_byte; + + memset(page_address(dest), 0, PAGE_SIZE); + + dma_chan = container_of(device->common.channels.next, + struct dma_chan, + device_node); + if (iop_adma_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + /* test xor */ + dest_dma = dma_map_page(dma_chan->device->dev, dest, 0, + PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) + dma_srcs[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i], + 0, PAGE_SIZE, DMA_TO_DEVICE); + tx = iop_adma_prep_dma_xor(dma_chan, dest_dma, dma_srcs, + IOP_ADMA_NUM_SRC_TEST, PAGE_SIZE, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_status(dma_chan, cookie, NULL) != + DMA_COMPLETE) { + dev_err(dma_chan->device->dev, + "Self-test xor timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + iop_chan = to_iop_adma_chan(dma_chan); + dma_sync_single_for_cpu(&iop_chan->device->pdev->dev, dest_dma, + PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { + u32 *ptr = page_address(dest); + if (ptr[i] != cmp_word) { + dev_err(dma_chan->device->dev, + "Self-test xor failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + } + dma_sync_single_for_device(&iop_chan->device->pdev->dev, dest_dma, + PAGE_SIZE, DMA_TO_DEVICE); + + /* skip zero sum if the capability is not present */ + if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask)) + goto free_resources; + + /* zero sum the sources with the destintation page */ + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) + zero_sum_srcs[i] = xor_srcs[i]; + zero_sum_srcs[i] = dest; + + zero_sum_result = 1; + + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = dma_map_page(dma_chan->device->dev, + zero_sum_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs, + IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, + &zero_sum_result, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { + dev_err(dma_chan->device->dev, + "Self-test zero sum timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + if (zero_sum_result != 0) { + dev_err(dma_chan->device->dev, + "Self-test zero sum failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + /* test for non-zero parity sum */ + zero_sum_result = 0; + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = dma_map_page(dma_chan->device->dev, + zero_sum_srcs[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + tx = iop_adma_prep_dma_xor_val(dma_chan, dma_srcs, + IOP_ADMA_NUM_SRC_TEST + 1, PAGE_SIZE, + &zero_sum_result, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_status(dma_chan, cookie, NULL) != DMA_COMPLETE) { + dev_err(dma_chan->device->dev, + "Self-test non-zero sum timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + if (zero_sum_result != 1) { + dev_err(dma_chan->device->dev, + "Self-test non-zero sum failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + +free_resources: + iop_adma_free_chan_resources(dma_chan); +out: + src_idx = IOP_ADMA_NUM_SRC_TEST; + while (src_idx--) + __free_page(xor_srcs[src_idx]); + __free_page(dest); + return err; +} + +#ifdef CONFIG_RAID6_PQ +static int +iop_adma_pq_zero_sum_self_test(struct iop_adma_device *device) +{ + /* combined sources, software pq results, and extra hw pq results */ + struct page *pq[IOP_ADMA_NUM_SRC_TEST+2+2]; + /* ptr to the extra hw pq buffers defined above */ + struct page **pq_hw = &pq[IOP_ADMA_NUM_SRC_TEST+2]; + /* address conversion buffers (dma_map / page_address) */ + void *pq_sw[IOP_ADMA_NUM_SRC_TEST+2]; + dma_addr_t pq_src[IOP_ADMA_NUM_SRC_TEST+2]; + dma_addr_t *pq_dest = &pq_src[IOP_ADMA_NUM_SRC_TEST]; + + int i; + struct dma_async_tx_descriptor *tx; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + u32 zero_sum_result; + int err = 0; + struct device *dev; + + dev_dbg(device->common.dev, "%s\n", __func__); + + for (i = 0; i < ARRAY_SIZE(pq); i++) { + pq[i] = alloc_page(GFP_KERNEL); + if (!pq[i]) { + while (i--) + __free_page(pq[i]); + return -ENOMEM; + } + } + + /* Fill in src buffers */ + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) { + pq_sw[i] = page_address(pq[i]); + memset(pq_sw[i], 0x11111111 * (1<<i), PAGE_SIZE); + } + pq_sw[i] = page_address(pq[i]); + pq_sw[i+1] = page_address(pq[i+1]); + + dma_chan = container_of(device->common.channels.next, + struct dma_chan, + device_node); + if (iop_adma_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + dev = dma_chan->device->dev; + + /* initialize the dests */ + memset(page_address(pq_hw[0]), 0 , PAGE_SIZE); + memset(page_address(pq_hw[1]), 0 , PAGE_SIZE); + + /* test pq */ + pq_dest[0] = dma_map_page(dev, pq_hw[0], 0, PAGE_SIZE, DMA_FROM_DEVICE); + pq_dest[1] = dma_map_page(dev, pq_hw[1], 0, PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST; i++) + pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + + tx = iop_adma_prep_dma_pq(dma_chan, pq_dest, pq_src, + IOP_ADMA_NUM_SRC_TEST, (u8 *)raid6_gfexp, + PAGE_SIZE, + DMA_PREP_INTERRUPT | + DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_status(dma_chan, cookie, NULL) != + DMA_COMPLETE) { + dev_err(dev, "Self-test pq timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + raid6_call.gen_syndrome(IOP_ADMA_NUM_SRC_TEST+2, PAGE_SIZE, pq_sw); + + if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST], + page_address(pq_hw[0]), PAGE_SIZE) != 0) { + dev_err(dev, "Self-test p failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + if (memcmp(pq_sw[IOP_ADMA_NUM_SRC_TEST+1], + page_address(pq_hw[1]), PAGE_SIZE) != 0) { + dev_err(dev, "Self-test q failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + /* test correct zero sum using the software generated pq values */ + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++) + pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + + zero_sum_result = ~0; + tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST], + pq_src, IOP_ADMA_NUM_SRC_TEST, + raid6_gfexp, PAGE_SIZE, &zero_sum_result, + DMA_PREP_INTERRUPT|DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_status(dma_chan, cookie, NULL) != + DMA_COMPLETE) { + dev_err(dev, "Self-test pq-zero-sum timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + if (zero_sum_result != 0) { + dev_err(dev, "Self-test pq-zero-sum failed to validate: %x\n", + zero_sum_result); + err = -ENODEV; + goto free_resources; + } + + /* test incorrect zero sum */ + i = IOP_ADMA_NUM_SRC_TEST; + memset(pq_sw[i] + 100, 0, 100); + memset(pq_sw[i+1] + 200, 0, 200); + for (i = 0; i < IOP_ADMA_NUM_SRC_TEST + 2; i++) + pq_src[i] = dma_map_page(dev, pq[i], 0, PAGE_SIZE, + DMA_TO_DEVICE); + + zero_sum_result = 0; + tx = iop_adma_prep_dma_pq_val(dma_chan, &pq_src[IOP_ADMA_NUM_SRC_TEST], + pq_src, IOP_ADMA_NUM_SRC_TEST, + raid6_gfexp, PAGE_SIZE, &zero_sum_result, + DMA_PREP_INTERRUPT|DMA_CTRL_ACK); + + cookie = iop_adma_tx_submit(tx); + iop_adma_issue_pending(dma_chan); + msleep(8); + + if (iop_adma_status(dma_chan, cookie, NULL) != + DMA_COMPLETE) { + dev_err(dev, "Self-test !pq-zero-sum timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + if (zero_sum_result != (SUM_CHECK_P_RESULT | SUM_CHECK_Q_RESULT)) { + dev_err(dev, "Self-test !pq-zero-sum failed to validate: %x\n", + zero_sum_result); + err = -ENODEV; + goto free_resources; + } + +free_resources: + iop_adma_free_chan_resources(dma_chan); +out: + i = ARRAY_SIZE(pq); + while (i--) + __free_page(pq[i]); + return err; +} +#endif + +static int iop_adma_remove(struct platform_device *dev) +{ + struct iop_adma_device *device = platform_get_drvdata(dev); + struct dma_chan *chan, *_chan; + struct iop_adma_chan *iop_chan; + struct iop_adma_platform_data *plat_data = dev_get_platdata(&dev->dev); + + dma_async_device_unregister(&device->common); + + dma_free_coherent(&dev->dev, plat_data->pool_size, + device->dma_desc_pool_virt, device->dma_desc_pool); + + list_for_each_entry_safe(chan, _chan, &device->common.channels, + device_node) { + iop_chan = to_iop_adma_chan(chan); + list_del(&chan->device_node); + kfree(iop_chan); + } + kfree(device); + + return 0; +} + +static int iop_adma_probe(struct platform_device *pdev) +{ + struct resource *res; + int ret = 0, i; + struct iop_adma_device *adev; + struct iop_adma_chan *iop_chan; + struct dma_device *dma_dev; + struct iop_adma_platform_data *plat_data = dev_get_platdata(&pdev->dev); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + if (!devm_request_mem_region(&pdev->dev, res->start, + resource_size(res), pdev->name)) + return -EBUSY; + + adev = kzalloc(sizeof(*adev), GFP_KERNEL); + if (!adev) + return -ENOMEM; + dma_dev = &adev->common; + + /* allocate coherent memory for hardware descriptors + * note: writecombine gives slightly better performance, but + * requires that we explicitly flush the writes + */ + if ((adev->dma_desc_pool_virt = dma_alloc_writecombine(&pdev->dev, + plat_data->pool_size, + &adev->dma_desc_pool, + GFP_KERNEL)) == NULL) { + ret = -ENOMEM; + goto err_free_adev; + } + + dev_dbg(&pdev->dev, "%s: allocated descriptor pool virt %p phys %p\n", + __func__, adev->dma_desc_pool_virt, + (void *) adev->dma_desc_pool); + + adev->id = plat_data->hw_id; + + /* discover transaction capabilites from the platform data */ + dma_dev->cap_mask = plat_data->cap_mask; + + adev->pdev = pdev; + platform_set_drvdata(pdev, adev); + + INIT_LIST_HEAD(&dma_dev->channels); + + /* set base routines */ + dma_dev->device_alloc_chan_resources = iop_adma_alloc_chan_resources; + dma_dev->device_free_chan_resources = iop_adma_free_chan_resources; + dma_dev->device_tx_status = iop_adma_status; + dma_dev->device_issue_pending = iop_adma_issue_pending; + dma_dev->dev = &pdev->dev; + + /* set prep routines based on capability */ + if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) + dma_dev->device_prep_dma_memcpy = iop_adma_prep_dma_memcpy; + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + dma_dev->max_xor = iop_adma_get_max_xor(); + dma_dev->device_prep_dma_xor = iop_adma_prep_dma_xor; + } + if (dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask)) + dma_dev->device_prep_dma_xor_val = + iop_adma_prep_dma_xor_val; + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { + dma_set_maxpq(dma_dev, iop_adma_get_max_pq(), 0); + dma_dev->device_prep_dma_pq = iop_adma_prep_dma_pq; + } + if (dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) + dma_dev->device_prep_dma_pq_val = + iop_adma_prep_dma_pq_val; + if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) + dma_dev->device_prep_dma_interrupt = + iop_adma_prep_dma_interrupt; + + iop_chan = kzalloc(sizeof(*iop_chan), GFP_KERNEL); + if (!iop_chan) { + ret = -ENOMEM; + goto err_free_dma; + } + iop_chan->device = adev; + + iop_chan->mmr_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!iop_chan->mmr_base) { + ret = -ENOMEM; + goto err_free_iop_chan; + } + tasklet_init(&iop_chan->irq_tasklet, iop_adma_tasklet, (unsigned long) + iop_chan); + + /* clear errors before enabling interrupts */ + iop_adma_device_clear_err_status(iop_chan); + + for (i = 0; i < 3; i++) { + irq_handler_t handler[] = { iop_adma_eot_handler, + iop_adma_eoc_handler, + iop_adma_err_handler }; + int irq = platform_get_irq(pdev, i); + if (irq < 0) { + ret = -ENXIO; + goto err_free_iop_chan; + } else { + ret = devm_request_irq(&pdev->dev, irq, + handler[i], 0, pdev->name, iop_chan); + if (ret) + goto err_free_iop_chan; + } + } + + spin_lock_init(&iop_chan->lock); + INIT_LIST_HEAD(&iop_chan->chain); + INIT_LIST_HEAD(&iop_chan->all_slots); + iop_chan->common.device = dma_dev; + dma_cookie_init(&iop_chan->common); + list_add_tail(&iop_chan->common.device_node, &dma_dev->channels); + + if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { + ret = iop_adma_memcpy_self_test(adev); + dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); + if (ret) + goto err_free_iop_chan; + } + + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + ret = iop_adma_xor_val_self_test(adev); + dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); + if (ret) + goto err_free_iop_chan; + } + + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask) && + dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask)) { + #ifdef CONFIG_RAID6_PQ + ret = iop_adma_pq_zero_sum_self_test(adev); + dev_dbg(&pdev->dev, "pq self test returned %d\n", ret); + #else + /* can not test raid6, so do not publish capability */ + dma_cap_clear(DMA_PQ, dma_dev->cap_mask); + dma_cap_clear(DMA_PQ_VAL, dma_dev->cap_mask); + ret = 0; + #endif + if (ret) + goto err_free_iop_chan; + } + + dev_info(&pdev->dev, "Intel(R) IOP: ( %s%s%s%s%s%s)\n", + dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "pq " : "", + dma_has_cap(DMA_PQ_VAL, dma_dev->cap_mask) ? "pq_val " : "", + dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", + dma_has_cap(DMA_XOR_VAL, dma_dev->cap_mask) ? "xor_val " : "", + dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", + dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); + + dma_async_device_register(dma_dev); + goto out; + + err_free_iop_chan: + kfree(iop_chan); + err_free_dma: + dma_free_coherent(&adev->pdev->dev, plat_data->pool_size, + adev->dma_desc_pool_virt, adev->dma_desc_pool); + err_free_adev: + kfree(adev); + out: + return ret; +} + +static void iop_chan_start_null_memcpy(struct iop_adma_chan *iop_chan) +{ + struct iop_adma_desc_slot *sw_desc, *grp_start; + dma_cookie_t cookie; + int slot_cnt, slots_per_op; + + dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_memcpy_slot_count(0, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + grp_start = sw_desc->group_head; + + list_splice_init(&sw_desc->tx_list, &iop_chan->chain); + async_tx_ack(&sw_desc->async_tx); + iop_desc_init_memcpy(grp_start, 0); + iop_desc_set_byte_count(grp_start, iop_chan, 0); + iop_desc_set_dest_addr(grp_start, iop_chan, 0); + iop_desc_set_memcpy_src_addr(grp_start, 0); + + cookie = dma_cookie_assign(&sw_desc->async_tx); + + /* initialize the completed cookie to be less than + * the most recently used cookie + */ + iop_chan->common.completed_cookie = cookie - 1; + + /* channel should not be busy */ + BUG_ON(iop_chan_is_busy(iop_chan)); + + /* clear any prior error-status bits */ + iop_adma_device_clear_err_status(iop_chan); + + /* disable operation */ + iop_chan_disable(iop_chan); + + /* set the descriptor address */ + iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); + + /* 1/ don't add pre-chained descriptors + * 2/ dummy read to flush next_desc write + */ + BUG_ON(iop_desc_get_next_desc(sw_desc)); + + /* run the descriptor */ + iop_chan_enable(iop_chan); + } else + dev_err(iop_chan->device->common.dev, + "failed to allocate null descriptor\n"); + spin_unlock_bh(&iop_chan->lock); +} + +static void iop_chan_start_null_xor(struct iop_adma_chan *iop_chan) +{ + struct iop_adma_desc_slot *sw_desc, *grp_start; + dma_cookie_t cookie; + int slot_cnt, slots_per_op; + + dev_dbg(iop_chan->device->common.dev, "%s\n", __func__); + + spin_lock_bh(&iop_chan->lock); + slot_cnt = iop_chan_xor_slot_count(0, 2, &slots_per_op); + sw_desc = iop_adma_alloc_slots(iop_chan, slot_cnt, slots_per_op); + if (sw_desc) { + grp_start = sw_desc->group_head; + list_splice_init(&sw_desc->tx_list, &iop_chan->chain); + async_tx_ack(&sw_desc->async_tx); + iop_desc_init_null_xor(grp_start, 2, 0); + iop_desc_set_byte_count(grp_start, iop_chan, 0); + iop_desc_set_dest_addr(grp_start, iop_chan, 0); + iop_desc_set_xor_src_addr(grp_start, 0, 0); + iop_desc_set_xor_src_addr(grp_start, 1, 0); + + cookie = dma_cookie_assign(&sw_desc->async_tx); + + /* initialize the completed cookie to be less than + * the most recently used cookie + */ + iop_chan->common.completed_cookie = cookie - 1; + + /* channel should not be busy */ + BUG_ON(iop_chan_is_busy(iop_chan)); + + /* clear any prior error-status bits */ + iop_adma_device_clear_err_status(iop_chan); + + /* disable operation */ + iop_chan_disable(iop_chan); + + /* set the descriptor address */ + iop_chan_set_next_descriptor(iop_chan, sw_desc->async_tx.phys); + + /* 1/ don't add pre-chained descriptors + * 2/ dummy read to flush next_desc write + */ + BUG_ON(iop_desc_get_next_desc(sw_desc)); + + /* run the descriptor */ + iop_chan_enable(iop_chan); + } else + dev_err(iop_chan->device->common.dev, + "failed to allocate null descriptor\n"); + spin_unlock_bh(&iop_chan->lock); +} + +static struct platform_driver iop_adma_driver = { + .probe = iop_adma_probe, + .remove = iop_adma_remove, + .driver = { + .name = "iop-adma", + }, +}; + +module_platform_driver(iop_adma_driver); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("IOP ADMA Engine Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:iop-adma"); diff --git a/drivers/dma/ipu/Makefile b/drivers/dma/ipu/Makefile new file mode 100644 index 000000000..6704cf483 --- /dev/null +++ b/drivers/dma/ipu/Makefile @@ -0,0 +1 @@ +obj-y += ipu_irq.o ipu_idmac.o diff --git a/drivers/dma/ipu/ipu_idmac.c b/drivers/dma/ipu/ipu_idmac.c new file mode 100644 index 000000000..b54f62de9 --- /dev/null +++ b/drivers/dma/ipu/ipu_idmac.c @@ -0,0 +1,1805 @@ +/* + * Copyright (C) 2008 + * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> + * + * Copyright (C) 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/list.h> +#include <linux/clk.h> +#include <linux/vmalloc.h> +#include <linux/string.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/dma/ipu-dma.h> + +#include "../dmaengine.h" +#include "ipu_intern.h" + +#define FS_VF_IN_VALID 0x00000002 +#define FS_ENC_IN_VALID 0x00000001 + +static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan, + bool wait_for_stop); + +/* + * There can be only one, we could allocate it dynamically, but then we'd have + * to add an extra parameter to some functions, and use something as ugly as + * struct ipu *ipu = to_ipu(to_idmac(ichan->dma_chan.device)); + * in the ISR + */ +static struct ipu ipu_data; + +#define to_ipu(id) container_of(id, struct ipu, idmac) + +static u32 __idmac_read_icreg(struct ipu *ipu, unsigned long reg) +{ + return __raw_readl(ipu->reg_ic + reg); +} + +#define idmac_read_icreg(ipu, reg) __idmac_read_icreg(ipu, reg - IC_CONF) + +static void __idmac_write_icreg(struct ipu *ipu, u32 value, unsigned long reg) +{ + __raw_writel(value, ipu->reg_ic + reg); +} + +#define idmac_write_icreg(ipu, v, reg) __idmac_write_icreg(ipu, v, reg - IC_CONF) + +static u32 idmac_read_ipureg(struct ipu *ipu, unsigned long reg) +{ + return __raw_readl(ipu->reg_ipu + reg); +} + +static void idmac_write_ipureg(struct ipu *ipu, u32 value, unsigned long reg) +{ + __raw_writel(value, ipu->reg_ipu + reg); +} + +/***************************************************************************** + * IPU / IC common functions + */ +static void dump_idmac_reg(struct ipu *ipu) +{ + dev_dbg(ipu->dev, "IDMAC_CONF 0x%x, IC_CONF 0x%x, IDMAC_CHA_EN 0x%x, " + "IDMAC_CHA_PRI 0x%x, IDMAC_CHA_BUSY 0x%x\n", + idmac_read_icreg(ipu, IDMAC_CONF), + idmac_read_icreg(ipu, IC_CONF), + idmac_read_icreg(ipu, IDMAC_CHA_EN), + idmac_read_icreg(ipu, IDMAC_CHA_PRI), + idmac_read_icreg(ipu, IDMAC_CHA_BUSY)); + dev_dbg(ipu->dev, "BUF0_RDY 0x%x, BUF1_RDY 0x%x, CUR_BUF 0x%x, " + "DB_MODE 0x%x, TASKS_STAT 0x%x\n", + idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY), + idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY), + idmac_read_ipureg(ipu, IPU_CHA_CUR_BUF), + idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL), + idmac_read_ipureg(ipu, IPU_TASKS_STAT)); +} + +static uint32_t bytes_per_pixel(enum pixel_fmt fmt) +{ + switch (fmt) { + case IPU_PIX_FMT_GENERIC: /* generic data */ + case IPU_PIX_FMT_RGB332: + case IPU_PIX_FMT_YUV420P: + case IPU_PIX_FMT_YUV422P: + default: + return 1; + case IPU_PIX_FMT_RGB565: + case IPU_PIX_FMT_YUYV: + case IPU_PIX_FMT_UYVY: + return 2; + case IPU_PIX_FMT_BGR24: + case IPU_PIX_FMT_RGB24: + return 3; + case IPU_PIX_FMT_GENERIC_32: /* generic data */ + case IPU_PIX_FMT_BGR32: + case IPU_PIX_FMT_RGB32: + case IPU_PIX_FMT_ABGR32: + return 4; + } +} + +/* Enable direct write to memory by the Camera Sensor Interface */ +static void ipu_ic_enable_task(struct ipu *ipu, enum ipu_channel channel) +{ + uint32_t ic_conf, mask; + + switch (channel) { + case IDMAC_IC_0: + mask = IC_CONF_PRPENC_EN; + break; + case IDMAC_IC_7: + mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN; + break; + default: + return; + } + ic_conf = idmac_read_icreg(ipu, IC_CONF) | mask; + idmac_write_icreg(ipu, ic_conf, IC_CONF); +} + +/* Called under spin_lock_irqsave(&ipu_data.lock) */ +static void ipu_ic_disable_task(struct ipu *ipu, enum ipu_channel channel) +{ + uint32_t ic_conf, mask; + + switch (channel) { + case IDMAC_IC_0: + mask = IC_CONF_PRPENC_EN; + break; + case IDMAC_IC_7: + mask = IC_CONF_RWS_EN | IC_CONF_PRPENC_EN; + break; + default: + return; + } + ic_conf = idmac_read_icreg(ipu, IC_CONF) & ~mask; + idmac_write_icreg(ipu, ic_conf, IC_CONF); +} + +static uint32_t ipu_channel_status(struct ipu *ipu, enum ipu_channel channel) +{ + uint32_t stat = TASK_STAT_IDLE; + uint32_t task_stat_reg = idmac_read_ipureg(ipu, IPU_TASKS_STAT); + + switch (channel) { + case IDMAC_IC_7: + stat = (task_stat_reg & TSTAT_CSI2MEM_MASK) >> + TSTAT_CSI2MEM_OFFSET; + break; + case IDMAC_IC_0: + case IDMAC_SDC_0: + case IDMAC_SDC_1: + default: + break; + } + return stat; +} + +struct chan_param_mem_planar { + /* Word 0 */ + u32 xv:10; + u32 yv:10; + u32 xb:12; + + u32 yb:12; + u32 res1:2; + u32 nsb:1; + u32 lnpb:6; + u32 ubo_l:11; + + u32 ubo_h:15; + u32 vbo_l:17; + + u32 vbo_h:9; + u32 res2:3; + u32 fw:12; + u32 fh_l:8; + + u32 fh_h:4; + u32 res3:28; + + /* Word 1 */ + u32 eba0; + + u32 eba1; + + u32 bpp:3; + u32 sl:14; + u32 pfs:3; + u32 bam:3; + u32 res4:2; + u32 npb:6; + u32 res5:1; + + u32 sat:2; + u32 res6:30; +} __attribute__ ((packed)); + +struct chan_param_mem_interleaved { + /* Word 0 */ + u32 xv:10; + u32 yv:10; + u32 xb:12; + + u32 yb:12; + u32 sce:1; + u32 res1:1; + u32 nsb:1; + u32 lnpb:6; + u32 sx:10; + u32 sy_l:1; + + u32 sy_h:9; + u32 ns:10; + u32 sm:10; + u32 sdx_l:3; + + u32 sdx_h:2; + u32 sdy:5; + u32 sdrx:1; + u32 sdry:1; + u32 sdr1:1; + u32 res2:2; + u32 fw:12; + u32 fh_l:8; + + u32 fh_h:4; + u32 res3:28; + + /* Word 1 */ + u32 eba0; + + u32 eba1; + + u32 bpp:3; + u32 sl:14; + u32 pfs:3; + u32 bam:3; + u32 res4:2; + u32 npb:6; + u32 res5:1; + + u32 sat:2; + u32 scc:1; + u32 ofs0:5; + u32 ofs1:5; + u32 ofs2:5; + u32 ofs3:5; + u32 wid0:3; + u32 wid1:3; + u32 wid2:3; + + u32 wid3:3; + u32 dec_sel:1; + u32 res6:28; +} __attribute__ ((packed)); + +union chan_param_mem { + struct chan_param_mem_planar pp; + struct chan_param_mem_interleaved ip; +}; + +static void ipu_ch_param_set_plane_offset(union chan_param_mem *params, + u32 u_offset, u32 v_offset) +{ + params->pp.ubo_l = u_offset & 0x7ff; + params->pp.ubo_h = u_offset >> 11; + params->pp.vbo_l = v_offset & 0x1ffff; + params->pp.vbo_h = v_offset >> 17; +} + +static void ipu_ch_param_set_size(union chan_param_mem *params, + uint32_t pixel_fmt, uint16_t width, + uint16_t height, uint16_t stride) +{ + u32 u_offset; + u32 v_offset; + + params->pp.fw = width - 1; + params->pp.fh_l = height - 1; + params->pp.fh_h = (height - 1) >> 8; + params->pp.sl = stride - 1; + + switch (pixel_fmt) { + case IPU_PIX_FMT_GENERIC: + /*Represents 8-bit Generic data */ + params->pp.bpp = 3; + params->pp.pfs = 7; + params->pp.npb = 31; + params->pp.sat = 2; /* SAT = use 32-bit access */ + break; + case IPU_PIX_FMT_GENERIC_32: + /*Represents 32-bit Generic data */ + params->pp.bpp = 0; + params->pp.pfs = 7; + params->pp.npb = 7; + params->pp.sat = 2; /* SAT = use 32-bit access */ + break; + case IPU_PIX_FMT_RGB565: + params->ip.bpp = 2; + params->ip.pfs = 4; + params->ip.npb = 15; + params->ip.sat = 2; /* SAT = 32-bit access */ + params->ip.ofs0 = 0; /* Red bit offset */ + params->ip.ofs1 = 5; /* Green bit offset */ + params->ip.ofs2 = 11; /* Blue bit offset */ + params->ip.ofs3 = 16; /* Alpha bit offset */ + params->ip.wid0 = 4; /* Red bit width - 1 */ + params->ip.wid1 = 5; /* Green bit width - 1 */ + params->ip.wid2 = 4; /* Blue bit width - 1 */ + break; + case IPU_PIX_FMT_BGR24: + params->ip.bpp = 1; /* 24 BPP & RGB PFS */ + params->ip.pfs = 4; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + params->ip.ofs0 = 0; /* Red bit offset */ + params->ip.ofs1 = 8; /* Green bit offset */ + params->ip.ofs2 = 16; /* Blue bit offset */ + params->ip.ofs3 = 24; /* Alpha bit offset */ + params->ip.wid0 = 7; /* Red bit width - 1 */ + params->ip.wid1 = 7; /* Green bit width - 1 */ + params->ip.wid2 = 7; /* Blue bit width - 1 */ + break; + case IPU_PIX_FMT_RGB24: + params->ip.bpp = 1; /* 24 BPP & RGB PFS */ + params->ip.pfs = 4; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + params->ip.ofs0 = 16; /* Red bit offset */ + params->ip.ofs1 = 8; /* Green bit offset */ + params->ip.ofs2 = 0; /* Blue bit offset */ + params->ip.ofs3 = 24; /* Alpha bit offset */ + params->ip.wid0 = 7; /* Red bit width - 1 */ + params->ip.wid1 = 7; /* Green bit width - 1 */ + params->ip.wid2 = 7; /* Blue bit width - 1 */ + break; + case IPU_PIX_FMT_BGRA32: + case IPU_PIX_FMT_BGR32: + case IPU_PIX_FMT_ABGR32: + params->ip.bpp = 0; + params->ip.pfs = 4; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + params->ip.ofs0 = 8; /* Red bit offset */ + params->ip.ofs1 = 16; /* Green bit offset */ + params->ip.ofs2 = 24; /* Blue bit offset */ + params->ip.ofs3 = 0; /* Alpha bit offset */ + params->ip.wid0 = 7; /* Red bit width - 1 */ + params->ip.wid1 = 7; /* Green bit width - 1 */ + params->ip.wid2 = 7; /* Blue bit width - 1 */ + params->ip.wid3 = 7; /* Alpha bit width - 1 */ + break; + case IPU_PIX_FMT_RGBA32: + case IPU_PIX_FMT_RGB32: + params->ip.bpp = 0; + params->ip.pfs = 4; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + params->ip.ofs0 = 24; /* Red bit offset */ + params->ip.ofs1 = 16; /* Green bit offset */ + params->ip.ofs2 = 8; /* Blue bit offset */ + params->ip.ofs3 = 0; /* Alpha bit offset */ + params->ip.wid0 = 7; /* Red bit width - 1 */ + params->ip.wid1 = 7; /* Green bit width - 1 */ + params->ip.wid2 = 7; /* Blue bit width - 1 */ + params->ip.wid3 = 7; /* Alpha bit width - 1 */ + break; + case IPU_PIX_FMT_UYVY: + params->ip.bpp = 2; + params->ip.pfs = 6; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + break; + case IPU_PIX_FMT_YUV420P2: + case IPU_PIX_FMT_YUV420P: + params->ip.bpp = 3; + params->ip.pfs = 3; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + u_offset = stride * height; + v_offset = u_offset + u_offset / 4; + ipu_ch_param_set_plane_offset(params, u_offset, v_offset); + break; + case IPU_PIX_FMT_YVU422P: + params->ip.bpp = 3; + params->ip.pfs = 2; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + v_offset = stride * height; + u_offset = v_offset + v_offset / 2; + ipu_ch_param_set_plane_offset(params, u_offset, v_offset); + break; + case IPU_PIX_FMT_YUV422P: + params->ip.bpp = 3; + params->ip.pfs = 2; + params->ip.npb = 7; + params->ip.sat = 2; /* SAT = 32-bit access */ + u_offset = stride * height; + v_offset = u_offset + u_offset / 2; + ipu_ch_param_set_plane_offset(params, u_offset, v_offset); + break; + default: + dev_err(ipu_data.dev, + "mx3 ipu: unimplemented pixel format %d\n", pixel_fmt); + break; + } + + params->pp.nsb = 1; +} + +static void ipu_ch_param_set_buffer(union chan_param_mem *params, + dma_addr_t buf0, dma_addr_t buf1) +{ + params->pp.eba0 = buf0; + params->pp.eba1 = buf1; +} + +static void ipu_ch_param_set_rotation(union chan_param_mem *params, + enum ipu_rotate_mode rotate) +{ + params->pp.bam = rotate; +} + +static void ipu_write_param_mem(uint32_t addr, uint32_t *data, + uint32_t num_words) +{ + for (; num_words > 0; num_words--) { + dev_dbg(ipu_data.dev, + "write param mem - addr = 0x%08X, data = 0x%08X\n", + addr, *data); + idmac_write_ipureg(&ipu_data, addr, IPU_IMA_ADDR); + idmac_write_ipureg(&ipu_data, *data++, IPU_IMA_DATA); + addr++; + if ((addr & 0x7) == 5) { + addr &= ~0x7; /* set to word 0 */ + addr += 8; /* increment to next row */ + } + } +} + +static int calc_resize_coeffs(uint32_t in_size, uint32_t out_size, + uint32_t *resize_coeff, + uint32_t *downsize_coeff) +{ + uint32_t temp_size; + uint32_t temp_downsize; + + *resize_coeff = 1 << 13; + *downsize_coeff = 1 << 13; + + /* Cannot downsize more than 8:1 */ + if (out_size << 3 < in_size) + return -EINVAL; + + /* compute downsizing coefficient */ + temp_downsize = 0; + temp_size = in_size; + while (temp_size >= out_size * 2 && temp_downsize < 2) { + temp_size >>= 1; + temp_downsize++; + } + *downsize_coeff = temp_downsize; + + /* + * compute resizing coefficient using the following formula: + * resize_coeff = M*(SI -1)/(SO - 1) + * where M = 2^13, SI - input size, SO - output size + */ + *resize_coeff = (8192L * (temp_size - 1)) / (out_size - 1); + if (*resize_coeff >= 16384L) { + dev_err(ipu_data.dev, "Warning! Overflow on resize coeff.\n"); + *resize_coeff = 0x3FFF; + } + + dev_dbg(ipu_data.dev, "resizing from %u -> %u pixels, " + "downsize=%u, resize=%u.%lu (reg=%u)\n", in_size, out_size, + *downsize_coeff, *resize_coeff >= 8192L ? 1 : 0, + ((*resize_coeff & 0x1FFF) * 10000L) / 8192L, *resize_coeff); + + return 0; +} + +static enum ipu_color_space format_to_colorspace(enum pixel_fmt fmt) +{ + switch (fmt) { + case IPU_PIX_FMT_RGB565: + case IPU_PIX_FMT_BGR24: + case IPU_PIX_FMT_RGB24: + case IPU_PIX_FMT_BGR32: + case IPU_PIX_FMT_RGB32: + return IPU_COLORSPACE_RGB; + default: + return IPU_COLORSPACE_YCBCR; + } +} + +static int ipu_ic_init_prpenc(struct ipu *ipu, + union ipu_channel_param *params, bool src_is_csi) +{ + uint32_t reg, ic_conf; + uint32_t downsize_coeff, resize_coeff; + enum ipu_color_space in_fmt, out_fmt; + + /* Setup vertical resizing */ + calc_resize_coeffs(params->video.in_height, + params->video.out_height, + &resize_coeff, &downsize_coeff); + reg = (downsize_coeff << 30) | (resize_coeff << 16); + + /* Setup horizontal resizing */ + calc_resize_coeffs(params->video.in_width, + params->video.out_width, + &resize_coeff, &downsize_coeff); + reg |= (downsize_coeff << 14) | resize_coeff; + + /* Setup color space conversion */ + in_fmt = format_to_colorspace(params->video.in_pixel_fmt); + out_fmt = format_to_colorspace(params->video.out_pixel_fmt); + + /* + * Colourspace conversion unsupported yet - see _init_csc() in + * Freescale sources + */ + if (in_fmt != out_fmt) { + dev_err(ipu->dev, "Colourspace conversion unsupported!\n"); + return -EOPNOTSUPP; + } + + idmac_write_icreg(ipu, reg, IC_PRP_ENC_RSC); + + ic_conf = idmac_read_icreg(ipu, IC_CONF); + + if (src_is_csi) + ic_conf &= ~IC_CONF_RWS_EN; + else + ic_conf |= IC_CONF_RWS_EN; + + idmac_write_icreg(ipu, ic_conf, IC_CONF); + + return 0; +} + +static uint32_t dma_param_addr(uint32_t dma_ch) +{ + /* Channel Parameter Memory */ + return 0x10000 | (dma_ch << 4); +} + +static void ipu_channel_set_priority(struct ipu *ipu, enum ipu_channel channel, + bool prio) +{ + u32 reg = idmac_read_icreg(ipu, IDMAC_CHA_PRI); + + if (prio) + reg |= 1UL << channel; + else + reg &= ~(1UL << channel); + + idmac_write_icreg(ipu, reg, IDMAC_CHA_PRI); + + dump_idmac_reg(ipu); +} + +static uint32_t ipu_channel_conf_mask(enum ipu_channel channel) +{ + uint32_t mask; + + switch (channel) { + case IDMAC_IC_0: + case IDMAC_IC_7: + mask = IPU_CONF_CSI_EN | IPU_CONF_IC_EN; + break; + case IDMAC_SDC_0: + case IDMAC_SDC_1: + mask = IPU_CONF_SDC_EN | IPU_CONF_DI_EN; + break; + default: + mask = 0; + break; + } + + return mask; +} + +/** + * ipu_enable_channel() - enable an IPU channel. + * @idmac: IPU DMAC context. + * @ichan: IDMAC channel. + * @return: 0 on success or negative error code on failure. + */ +static int ipu_enable_channel(struct idmac *idmac, struct idmac_channel *ichan) +{ + struct ipu *ipu = to_ipu(idmac); + enum ipu_channel channel = ichan->dma_chan.chan_id; + uint32_t reg; + unsigned long flags; + + spin_lock_irqsave(&ipu->lock, flags); + + /* Reset to buffer 0 */ + idmac_write_ipureg(ipu, 1UL << channel, IPU_CHA_CUR_BUF); + ichan->active_buffer = 0; + ichan->status = IPU_CHANNEL_ENABLED; + + switch (channel) { + case IDMAC_SDC_0: + case IDMAC_SDC_1: + case IDMAC_IC_7: + ipu_channel_set_priority(ipu, channel, true); + default: + break; + } + + reg = idmac_read_icreg(ipu, IDMAC_CHA_EN); + + idmac_write_icreg(ipu, reg | (1UL << channel), IDMAC_CHA_EN); + + ipu_ic_enable_task(ipu, channel); + + spin_unlock_irqrestore(&ipu->lock, flags); + return 0; +} + +/** + * ipu_init_channel_buffer() - initialize a buffer for logical IPU channel. + * @ichan: IDMAC channel. + * @pixel_fmt: pixel format of buffer. Pixel format is a FOURCC ASCII code. + * @width: width of buffer in pixels. + * @height: height of buffer in pixels. + * @stride: stride length of buffer in pixels. + * @rot_mode: rotation mode of buffer. A rotation setting other than + * IPU_ROTATE_VERT_FLIP should only be used for input buffers of + * rotation channels. + * @phyaddr_0: buffer 0 physical address. + * @phyaddr_1: buffer 1 physical address. Setting this to a value other than + * NULL enables double buffering mode. + * @return: 0 on success or negative error code on failure. + */ +static int ipu_init_channel_buffer(struct idmac_channel *ichan, + enum pixel_fmt pixel_fmt, + uint16_t width, uint16_t height, + uint32_t stride, + enum ipu_rotate_mode rot_mode, + dma_addr_t phyaddr_0, dma_addr_t phyaddr_1) +{ + enum ipu_channel channel = ichan->dma_chan.chan_id; + struct idmac *idmac = to_idmac(ichan->dma_chan.device); + struct ipu *ipu = to_ipu(idmac); + union chan_param_mem params = {}; + unsigned long flags; + uint32_t reg; + uint32_t stride_bytes; + + stride_bytes = stride * bytes_per_pixel(pixel_fmt); + + if (stride_bytes % 4) { + dev_err(ipu->dev, + "Stride length must be 32-bit aligned, stride = %d, bytes = %d\n", + stride, stride_bytes); + return -EINVAL; + } + + /* IC channel's stride must be a multiple of 8 pixels */ + if ((channel <= IDMAC_IC_13) && (stride % 8)) { + dev_err(ipu->dev, "Stride must be 8 pixel multiple\n"); + return -EINVAL; + } + + /* Build parameter memory data for DMA channel */ + ipu_ch_param_set_size(¶ms, pixel_fmt, width, height, stride_bytes); + ipu_ch_param_set_buffer(¶ms, phyaddr_0, phyaddr_1); + ipu_ch_param_set_rotation(¶ms, rot_mode); + + spin_lock_irqsave(&ipu->lock, flags); + + ipu_write_param_mem(dma_param_addr(channel), (uint32_t *)¶ms, 10); + + reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL); + + if (phyaddr_1) + reg |= 1UL << channel; + else + reg &= ~(1UL << channel); + + idmac_write_ipureg(ipu, reg, IPU_CHA_DB_MODE_SEL); + + ichan->status = IPU_CHANNEL_READY; + + spin_unlock_irqrestore(&ipu->lock, flags); + + return 0; +} + +/** + * ipu_select_buffer() - mark a channel's buffer as ready. + * @channel: channel ID. + * @buffer_n: buffer number to mark ready. + */ +static void ipu_select_buffer(enum ipu_channel channel, int buffer_n) +{ + /* No locking - this is a write-one-to-set register, cleared by IPU */ + if (buffer_n == 0) + /* Mark buffer 0 as ready. */ + idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF0_RDY); + else + /* Mark buffer 1 as ready. */ + idmac_write_ipureg(&ipu_data, 1UL << channel, IPU_CHA_BUF1_RDY); +} + +/** + * ipu_update_channel_buffer() - update physical address of a channel buffer. + * @ichan: IDMAC channel. + * @buffer_n: buffer number to update. + * 0 or 1 are the only valid values. + * @phyaddr: buffer physical address. + */ +/* Called under spin_lock(_irqsave)(&ichan->lock) */ +static void ipu_update_channel_buffer(struct idmac_channel *ichan, + int buffer_n, dma_addr_t phyaddr) +{ + enum ipu_channel channel = ichan->dma_chan.chan_id; + uint32_t reg; + unsigned long flags; + + spin_lock_irqsave(&ipu_data.lock, flags); + + if (buffer_n == 0) { + reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY); + if (reg & (1UL << channel)) { + ipu_ic_disable_task(&ipu_data, channel); + ichan->status = IPU_CHANNEL_READY; + } + + /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 0) */ + idmac_write_ipureg(&ipu_data, dma_param_addr(channel) + + 0x0008UL, IPU_IMA_ADDR); + idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA); + } else { + reg = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY); + if (reg & (1UL << channel)) { + ipu_ic_disable_task(&ipu_data, channel); + ichan->status = IPU_CHANNEL_READY; + } + + /* Check if double-buffering is already enabled */ + reg = idmac_read_ipureg(&ipu_data, IPU_CHA_DB_MODE_SEL); + + if (!(reg & (1UL << channel))) + idmac_write_ipureg(&ipu_data, reg | (1UL << channel), + IPU_CHA_DB_MODE_SEL); + + /* 44.3.3.1.9 - Row Number 1 (WORD1, offset 1) */ + idmac_write_ipureg(&ipu_data, dma_param_addr(channel) + + 0x0009UL, IPU_IMA_ADDR); + idmac_write_ipureg(&ipu_data, phyaddr, IPU_IMA_DATA); + } + + spin_unlock_irqrestore(&ipu_data.lock, flags); +} + +/* Called under spin_lock_irqsave(&ichan->lock) */ +static int ipu_submit_buffer(struct idmac_channel *ichan, + struct idmac_tx_desc *desc, struct scatterlist *sg, int buf_idx) +{ + unsigned int chan_id = ichan->dma_chan.chan_id; + struct device *dev = &ichan->dma_chan.dev->device; + + if (async_tx_test_ack(&desc->txd)) + return -EINTR; + + /* + * On first invocation this shouldn't be necessary, the call to + * ipu_init_channel_buffer() above will set addresses for us, so we + * could make it conditional on status >= IPU_CHANNEL_ENABLED, but + * doing it again shouldn't hurt either. + */ + ipu_update_channel_buffer(ichan, buf_idx, sg_dma_address(sg)); + + ipu_select_buffer(chan_id, buf_idx); + dev_dbg(dev, "Updated sg %p on channel 0x%x buffer %d\n", + sg, chan_id, buf_idx); + + return 0; +} + +/* Called under spin_lock_irqsave(&ichan->lock) */ +static int ipu_submit_channel_buffers(struct idmac_channel *ichan, + struct idmac_tx_desc *desc) +{ + struct scatterlist *sg; + int i, ret = 0; + + for (i = 0, sg = desc->sg; i < 2 && sg; i++) { + if (!ichan->sg[i]) { + ichan->sg[i] = sg; + + ret = ipu_submit_buffer(ichan, desc, sg, i); + if (ret < 0) + return ret; + + sg = sg_next(sg); + } + } + + return ret; +} + +static dma_cookie_t idmac_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct idmac_tx_desc *desc = to_tx_desc(tx); + struct idmac_channel *ichan = to_idmac_chan(tx->chan); + struct idmac *idmac = to_idmac(tx->chan->device); + struct ipu *ipu = to_ipu(idmac); + struct device *dev = &ichan->dma_chan.dev->device; + dma_cookie_t cookie; + unsigned long flags; + int ret; + + /* Sanity check */ + if (!list_empty(&desc->list)) { + /* The descriptor doesn't belong to client */ + dev_err(dev, "Descriptor %p not prepared!\n", tx); + return -EBUSY; + } + + mutex_lock(&ichan->chan_mutex); + + async_tx_clear_ack(tx); + + if (ichan->status < IPU_CHANNEL_READY) { + struct idmac_video_param *video = &ichan->params.video; + /* + * Initial buffer assignment - the first two sg-entries from + * the descriptor will end up in the IDMAC buffers + */ + dma_addr_t dma_1 = sg_is_last(desc->sg) ? 0 : + sg_dma_address(&desc->sg[1]); + + WARN_ON(ichan->sg[0] || ichan->sg[1]); + + cookie = ipu_init_channel_buffer(ichan, + video->out_pixel_fmt, + video->out_width, + video->out_height, + video->out_stride, + IPU_ROTATE_NONE, + sg_dma_address(&desc->sg[0]), + dma_1); + if (cookie < 0) + goto out; + } + + dev_dbg(dev, "Submitting sg %p\n", &desc->sg[0]); + + cookie = dma_cookie_assign(tx); + + /* ipu->lock can be taken under ichan->lock, but not v.v. */ + spin_lock_irqsave(&ichan->lock, flags); + + list_add_tail(&desc->list, &ichan->queue); + /* submit_buffers() atomically verifies and fills empty sg slots */ + ret = ipu_submit_channel_buffers(ichan, desc); + + spin_unlock_irqrestore(&ichan->lock, flags); + + if (ret < 0) { + cookie = ret; + goto dequeue; + } + + if (ichan->status < IPU_CHANNEL_ENABLED) { + ret = ipu_enable_channel(idmac, ichan); + if (ret < 0) { + cookie = ret; + goto dequeue; + } + } + + dump_idmac_reg(ipu); + +dequeue: + if (cookie < 0) { + spin_lock_irqsave(&ichan->lock, flags); + list_del_init(&desc->list); + spin_unlock_irqrestore(&ichan->lock, flags); + tx->cookie = cookie; + ichan->dma_chan.cookie = cookie; + } + +out: + mutex_unlock(&ichan->chan_mutex); + + return cookie; +} + +/* Called with ichan->chan_mutex held */ +static int idmac_desc_alloc(struct idmac_channel *ichan, int n) +{ + struct idmac_tx_desc *desc = vmalloc(n * sizeof(struct idmac_tx_desc)); + struct idmac *idmac = to_idmac(ichan->dma_chan.device); + + if (!desc) + return -ENOMEM; + + /* No interrupts, just disable the tasklet for a moment */ + tasklet_disable(&to_ipu(idmac)->tasklet); + + ichan->n_tx_desc = n; + ichan->desc = desc; + INIT_LIST_HEAD(&ichan->queue); + INIT_LIST_HEAD(&ichan->free_list); + + while (n--) { + struct dma_async_tx_descriptor *txd = &desc->txd; + + memset(txd, 0, sizeof(*txd)); + dma_async_tx_descriptor_init(txd, &ichan->dma_chan); + txd->tx_submit = idmac_tx_submit; + + list_add(&desc->list, &ichan->free_list); + + desc++; + } + + tasklet_enable(&to_ipu(idmac)->tasklet); + + return 0; +} + +/** + * ipu_init_channel() - initialize an IPU channel. + * @idmac: IPU DMAC context. + * @ichan: pointer to the channel object. + * @return 0 on success or negative error code on failure. + */ +static int ipu_init_channel(struct idmac *idmac, struct idmac_channel *ichan) +{ + union ipu_channel_param *params = &ichan->params; + uint32_t ipu_conf; + enum ipu_channel channel = ichan->dma_chan.chan_id; + unsigned long flags; + uint32_t reg; + struct ipu *ipu = to_ipu(idmac); + int ret = 0, n_desc = 0; + + dev_dbg(ipu->dev, "init channel = %d\n", channel); + + if (channel != IDMAC_SDC_0 && channel != IDMAC_SDC_1 && + channel != IDMAC_IC_7) + return -EINVAL; + + spin_lock_irqsave(&ipu->lock, flags); + + switch (channel) { + case IDMAC_IC_7: + n_desc = 16; + reg = idmac_read_icreg(ipu, IC_CONF); + idmac_write_icreg(ipu, reg & ~IC_CONF_CSI_MEM_WR_EN, IC_CONF); + break; + case IDMAC_IC_0: + n_desc = 16; + reg = idmac_read_ipureg(ipu, IPU_FS_PROC_FLOW); + idmac_write_ipureg(ipu, reg & ~FS_ENC_IN_VALID, IPU_FS_PROC_FLOW); + ret = ipu_ic_init_prpenc(ipu, params, true); + break; + case IDMAC_SDC_0: + case IDMAC_SDC_1: + n_desc = 4; + default: + break; + } + + ipu->channel_init_mask |= 1L << channel; + + /* Enable IPU sub module */ + ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) | + ipu_channel_conf_mask(channel); + idmac_write_ipureg(ipu, ipu_conf, IPU_CONF); + + spin_unlock_irqrestore(&ipu->lock, flags); + + if (n_desc && !ichan->desc) + ret = idmac_desc_alloc(ichan, n_desc); + + dump_idmac_reg(ipu); + + return ret; +} + +/** + * ipu_uninit_channel() - uninitialize an IPU channel. + * @idmac: IPU DMAC context. + * @ichan: pointer to the channel object. + */ +static void ipu_uninit_channel(struct idmac *idmac, struct idmac_channel *ichan) +{ + enum ipu_channel channel = ichan->dma_chan.chan_id; + unsigned long flags; + uint32_t reg; + unsigned long chan_mask = 1UL << channel; + uint32_t ipu_conf; + struct ipu *ipu = to_ipu(idmac); + + spin_lock_irqsave(&ipu->lock, flags); + + if (!(ipu->channel_init_mask & chan_mask)) { + dev_err(ipu->dev, "Channel already uninitialized %d\n", + channel); + spin_unlock_irqrestore(&ipu->lock, flags); + return; + } + + /* Reset the double buffer */ + reg = idmac_read_ipureg(ipu, IPU_CHA_DB_MODE_SEL); + idmac_write_ipureg(ipu, reg & ~chan_mask, IPU_CHA_DB_MODE_SEL); + + ichan->sec_chan_en = false; + + switch (channel) { + case IDMAC_IC_7: + reg = idmac_read_icreg(ipu, IC_CONF); + idmac_write_icreg(ipu, reg & ~(IC_CONF_RWS_EN | IC_CONF_PRPENC_EN), + IC_CONF); + break; + case IDMAC_IC_0: + reg = idmac_read_icreg(ipu, IC_CONF); + idmac_write_icreg(ipu, reg & ~(IC_CONF_PRPENC_EN | IC_CONF_PRPENC_CSC1), + IC_CONF); + break; + case IDMAC_SDC_0: + case IDMAC_SDC_1: + default: + break; + } + + ipu->channel_init_mask &= ~(1L << channel); + + ipu_conf = idmac_read_ipureg(ipu, IPU_CONF) & + ~ipu_channel_conf_mask(channel); + idmac_write_ipureg(ipu, ipu_conf, IPU_CONF); + + spin_unlock_irqrestore(&ipu->lock, flags); + + ichan->n_tx_desc = 0; + vfree(ichan->desc); + ichan->desc = NULL; +} + +/** + * ipu_disable_channel() - disable an IPU channel. + * @idmac: IPU DMAC context. + * @ichan: channel object pointer. + * @wait_for_stop: flag to set whether to wait for channel end of frame or + * return immediately. + * @return: 0 on success or negative error code on failure. + */ +static int ipu_disable_channel(struct idmac *idmac, struct idmac_channel *ichan, + bool wait_for_stop) +{ + enum ipu_channel channel = ichan->dma_chan.chan_id; + struct ipu *ipu = to_ipu(idmac); + uint32_t reg; + unsigned long flags; + unsigned long chan_mask = 1UL << channel; + unsigned int timeout; + + if (wait_for_stop && channel != IDMAC_SDC_1 && channel != IDMAC_SDC_0) { + timeout = 40; + /* This waiting always fails. Related to spurious irq problem */ + while ((idmac_read_icreg(ipu, IDMAC_CHA_BUSY) & chan_mask) || + (ipu_channel_status(ipu, channel) == TASK_STAT_ACTIVE)) { + timeout--; + msleep(10); + + if (!timeout) { + dev_dbg(ipu->dev, + "Warning: timeout waiting for channel %u to " + "stop: buf0_rdy = 0x%08X, buf1_rdy = 0x%08X, " + "busy = 0x%08X, tstat = 0x%08X\n", channel, + idmac_read_ipureg(ipu, IPU_CHA_BUF0_RDY), + idmac_read_ipureg(ipu, IPU_CHA_BUF1_RDY), + idmac_read_icreg(ipu, IDMAC_CHA_BUSY), + idmac_read_ipureg(ipu, IPU_TASKS_STAT)); + break; + } + } + dev_dbg(ipu->dev, "timeout = %d * 10ms\n", 40 - timeout); + } + /* SDC BG and FG must be disabled before DMA is disabled */ + if (wait_for_stop && (channel == IDMAC_SDC_0 || + channel == IDMAC_SDC_1)) { + for (timeout = 5; + timeout && !ipu_irq_status(ichan->eof_irq); timeout--) + msleep(5); + } + + spin_lock_irqsave(&ipu->lock, flags); + + /* Disable IC task */ + ipu_ic_disable_task(ipu, channel); + + /* Disable DMA channel(s) */ + reg = idmac_read_icreg(ipu, IDMAC_CHA_EN); + idmac_write_icreg(ipu, reg & ~chan_mask, IDMAC_CHA_EN); + + spin_unlock_irqrestore(&ipu->lock, flags); + + return 0; +} + +static struct scatterlist *idmac_sg_next(struct idmac_channel *ichan, + struct idmac_tx_desc **desc, struct scatterlist *sg) +{ + struct scatterlist *sgnew = sg ? sg_next(sg) : NULL; + + if (sgnew) + /* next sg-element in this list */ + return sgnew; + + if ((*desc)->list.next == &ichan->queue) + /* No more descriptors on the queue */ + return NULL; + + /* Fetch next descriptor */ + *desc = list_entry((*desc)->list.next, struct idmac_tx_desc, list); + return (*desc)->sg; +} + +/* + * We have several possibilities here: + * current BUF next BUF + * + * not last sg next not last sg + * not last sg next last sg + * last sg first sg from next descriptor + * last sg NULL + * + * Besides, the descriptor queue might be empty or not. We process all these + * cases carefully. + */ +static irqreturn_t idmac_interrupt(int irq, void *dev_id) +{ + struct idmac_channel *ichan = dev_id; + struct device *dev = &ichan->dma_chan.dev->device; + unsigned int chan_id = ichan->dma_chan.chan_id; + struct scatterlist **sg, *sgnext, *sgnew = NULL; + /* Next transfer descriptor */ + struct idmac_tx_desc *desc, *descnew; + dma_async_tx_callback callback; + void *callback_param; + bool done = false; + u32 ready0, ready1, curbuf, err; + unsigned long flags; + + /* IDMAC has cleared the respective BUFx_RDY bit, we manage the buffer */ + + dev_dbg(dev, "IDMAC irq %d, buf %d\n", irq, ichan->active_buffer); + + spin_lock_irqsave(&ipu_data.lock, flags); + + ready0 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF0_RDY); + ready1 = idmac_read_ipureg(&ipu_data, IPU_CHA_BUF1_RDY); + curbuf = idmac_read_ipureg(&ipu_data, IPU_CHA_CUR_BUF); + err = idmac_read_ipureg(&ipu_data, IPU_INT_STAT_4); + + if (err & (1 << chan_id)) { + idmac_write_ipureg(&ipu_data, 1 << chan_id, IPU_INT_STAT_4); + spin_unlock_irqrestore(&ipu_data.lock, flags); + /* + * Doing this + * ichan->sg[0] = ichan->sg[1] = NULL; + * you can force channel re-enable on the next tx_submit(), but + * this is dirty - think about descriptors with multiple + * sg elements. + */ + dev_warn(dev, "NFB4EOF on channel %d, ready %x, %x, cur %x\n", + chan_id, ready0, ready1, curbuf); + return IRQ_HANDLED; + } + spin_unlock_irqrestore(&ipu_data.lock, flags); + + /* Other interrupts do not interfere with this channel */ + spin_lock(&ichan->lock); + if (unlikely((ichan->active_buffer && (ready1 >> chan_id) & 1) || + (!ichan->active_buffer && (ready0 >> chan_id) & 1) + )) { + spin_unlock(&ichan->lock); + dev_dbg(dev, + "IRQ with active buffer still ready on channel %x, " + "active %d, ready %x, %x!\n", chan_id, + ichan->active_buffer, ready0, ready1); + return IRQ_NONE; + } + + if (unlikely(list_empty(&ichan->queue))) { + ichan->sg[ichan->active_buffer] = NULL; + spin_unlock(&ichan->lock); + dev_err(dev, + "IRQ without queued buffers on channel %x, active %d, " + "ready %x, %x!\n", chan_id, + ichan->active_buffer, ready0, ready1); + return IRQ_NONE; + } + + /* + * active_buffer is a software flag, it shows which buffer we are + * currently expecting back from the hardware, IDMAC should be + * processing the other buffer already + */ + sg = &ichan->sg[ichan->active_buffer]; + sgnext = ichan->sg[!ichan->active_buffer]; + + if (!*sg) { + spin_unlock(&ichan->lock); + return IRQ_HANDLED; + } + + desc = list_entry(ichan->queue.next, struct idmac_tx_desc, list); + descnew = desc; + + dev_dbg(dev, "IDMAC irq %d, dma %#llx, next dma %#llx, current %d, curbuf %#x\n", + irq, (u64)sg_dma_address(*sg), + sgnext ? (u64)sg_dma_address(sgnext) : 0, + ichan->active_buffer, curbuf); + + /* Find the descriptor of sgnext */ + sgnew = idmac_sg_next(ichan, &descnew, *sg); + if (sgnext != sgnew) + dev_err(dev, "Submitted buffer %p, next buffer %p\n", sgnext, sgnew); + + /* + * if sgnext == NULL sg must be the last element in a scatterlist and + * queue must be empty + */ + if (unlikely(!sgnext)) { + if (!WARN_ON(sg_next(*sg))) + dev_dbg(dev, "Underrun on channel %x\n", chan_id); + ichan->sg[!ichan->active_buffer] = sgnew; + + if (unlikely(sgnew)) { + ipu_submit_buffer(ichan, descnew, sgnew, !ichan->active_buffer); + } else { + spin_lock_irqsave(&ipu_data.lock, flags); + ipu_ic_disable_task(&ipu_data, chan_id); + spin_unlock_irqrestore(&ipu_data.lock, flags); + ichan->status = IPU_CHANNEL_READY; + /* Continue to check for complete descriptor */ + } + } + + /* Calculate and submit the next sg element */ + sgnew = idmac_sg_next(ichan, &descnew, sgnew); + + if (unlikely(!sg_next(*sg)) || !sgnext) { + /* + * Last element in scatterlist done, remove from the queue, + * _init for debugging + */ + list_del_init(&desc->list); + done = true; + } + + *sg = sgnew; + + if (likely(sgnew) && + ipu_submit_buffer(ichan, descnew, sgnew, ichan->active_buffer) < 0) { + callback = descnew->txd.callback; + callback_param = descnew->txd.callback_param; + list_del_init(&descnew->list); + spin_unlock(&ichan->lock); + if (callback) + callback(callback_param); + spin_lock(&ichan->lock); + } + + /* Flip the active buffer - even if update above failed */ + ichan->active_buffer = !ichan->active_buffer; + if (done) + dma_cookie_complete(&desc->txd); + + callback = desc->txd.callback; + callback_param = desc->txd.callback_param; + + spin_unlock(&ichan->lock); + + if (done && (desc->txd.flags & DMA_PREP_INTERRUPT) && callback) + callback(callback_param); + + return IRQ_HANDLED; +} + +static void ipu_gc_tasklet(unsigned long arg) +{ + struct ipu *ipu = (struct ipu *)arg; + int i; + + for (i = 0; i < IPU_CHANNELS_NUM; i++) { + struct idmac_channel *ichan = ipu->channel + i; + struct idmac_tx_desc *desc; + unsigned long flags; + struct scatterlist *sg; + int j, k; + + for (j = 0; j < ichan->n_tx_desc; j++) { + desc = ichan->desc + j; + spin_lock_irqsave(&ichan->lock, flags); + if (async_tx_test_ack(&desc->txd)) { + list_move(&desc->list, &ichan->free_list); + for_each_sg(desc->sg, sg, desc->sg_len, k) { + if (ichan->sg[0] == sg) + ichan->sg[0] = NULL; + else if (ichan->sg[1] == sg) + ichan->sg[1] = NULL; + } + async_tx_clear_ack(&desc->txd); + } + spin_unlock_irqrestore(&ichan->lock, flags); + } + } +} + +/* Allocate and initialise a transfer descriptor. */ +static struct dma_async_tx_descriptor *idmac_prep_slave_sg(struct dma_chan *chan, + struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long tx_flags, + void *context) +{ + struct idmac_channel *ichan = to_idmac_chan(chan); + struct idmac_tx_desc *desc = NULL; + struct dma_async_tx_descriptor *txd = NULL; + unsigned long flags; + + /* We only can handle these three channels so far */ + if (chan->chan_id != IDMAC_SDC_0 && chan->chan_id != IDMAC_SDC_1 && + chan->chan_id != IDMAC_IC_7) + return NULL; + + if (!is_slave_direction(direction)) { + dev_err(chan->device->dev, "Invalid DMA direction %d!\n", direction); + return NULL; + } + + mutex_lock(&ichan->chan_mutex); + + spin_lock_irqsave(&ichan->lock, flags); + if (!list_empty(&ichan->free_list)) { + desc = list_entry(ichan->free_list.next, + struct idmac_tx_desc, list); + + list_del_init(&desc->list); + + desc->sg_len = sg_len; + desc->sg = sgl; + txd = &desc->txd; + txd->flags = tx_flags; + } + spin_unlock_irqrestore(&ichan->lock, flags); + + mutex_unlock(&ichan->chan_mutex); + + tasklet_schedule(&to_ipu(to_idmac(chan->device))->tasklet); + + return txd; +} + +/* Re-select the current buffer and re-activate the channel */ +static void idmac_issue_pending(struct dma_chan *chan) +{ + struct idmac_channel *ichan = to_idmac_chan(chan); + struct idmac *idmac = to_idmac(chan->device); + struct ipu *ipu = to_ipu(idmac); + unsigned long flags; + + /* This is not always needed, but doesn't hurt either */ + spin_lock_irqsave(&ipu->lock, flags); + ipu_select_buffer(chan->chan_id, ichan->active_buffer); + spin_unlock_irqrestore(&ipu->lock, flags); + + /* + * Might need to perform some parts of initialisation from + * ipu_enable_channel(), but not all, we do not want to reset to buffer + * 0, don't need to set priority again either, but re-enabling the task + * and the channel might be a good idea. + */ +} + +static int idmac_pause(struct dma_chan *chan) +{ + struct idmac_channel *ichan = to_idmac_chan(chan); + struct idmac *idmac = to_idmac(chan->device); + struct ipu *ipu = to_ipu(idmac); + struct list_head *list, *tmp; + unsigned long flags; + + mutex_lock(&ichan->chan_mutex); + + spin_lock_irqsave(&ipu->lock, flags); + ipu_ic_disable_task(ipu, chan->chan_id); + + /* Return all descriptors into "prepared" state */ + list_for_each_safe(list, tmp, &ichan->queue) + list_del_init(list); + + ichan->sg[0] = NULL; + ichan->sg[1] = NULL; + + spin_unlock_irqrestore(&ipu->lock, flags); + + ichan->status = IPU_CHANNEL_INITIALIZED; + + mutex_unlock(&ichan->chan_mutex); + + return 0; +} + +static int __idmac_terminate_all(struct dma_chan *chan) +{ + struct idmac_channel *ichan = to_idmac_chan(chan); + struct idmac *idmac = to_idmac(chan->device); + struct ipu *ipu = to_ipu(idmac); + unsigned long flags; + int i; + + ipu_disable_channel(idmac, ichan, + ichan->status >= IPU_CHANNEL_ENABLED); + + tasklet_disable(&ipu->tasklet); + + /* ichan->queue is modified in ISR, have to spinlock */ + spin_lock_irqsave(&ichan->lock, flags); + list_splice_init(&ichan->queue, &ichan->free_list); + + if (ichan->desc) + for (i = 0; i < ichan->n_tx_desc; i++) { + struct idmac_tx_desc *desc = ichan->desc + i; + if (list_empty(&desc->list)) + /* Descriptor was prepared, but not submitted */ + list_add(&desc->list, &ichan->free_list); + + async_tx_clear_ack(&desc->txd); + } + + ichan->sg[0] = NULL; + ichan->sg[1] = NULL; + spin_unlock_irqrestore(&ichan->lock, flags); + + tasklet_enable(&ipu->tasklet); + + ichan->status = IPU_CHANNEL_INITIALIZED; + + return 0; +} + +static int idmac_terminate_all(struct dma_chan *chan) +{ + struct idmac_channel *ichan = to_idmac_chan(chan); + int ret; + + mutex_lock(&ichan->chan_mutex); + + ret = __idmac_terminate_all(chan); + + mutex_unlock(&ichan->chan_mutex); + + return ret; +} + +#ifdef DEBUG +static irqreturn_t ic_sof_irq(int irq, void *dev_id) +{ + struct idmac_channel *ichan = dev_id; + printk(KERN_DEBUG "Got SOF IRQ %d on Channel %d\n", + irq, ichan->dma_chan.chan_id); + disable_irq_nosync(irq); + return IRQ_HANDLED; +} + +static irqreturn_t ic_eof_irq(int irq, void *dev_id) +{ + struct idmac_channel *ichan = dev_id; + printk(KERN_DEBUG "Got EOF IRQ %d on Channel %d\n", + irq, ichan->dma_chan.chan_id); + disable_irq_nosync(irq); + return IRQ_HANDLED; +} + +static int ic_sof = -EINVAL, ic_eof = -EINVAL; +#endif + +static int idmac_alloc_chan_resources(struct dma_chan *chan) +{ + struct idmac_channel *ichan = to_idmac_chan(chan); + struct idmac *idmac = to_idmac(chan->device); + int ret; + + /* dmaengine.c now guarantees to only offer free channels */ + BUG_ON(chan->client_count > 1); + WARN_ON(ichan->status != IPU_CHANNEL_FREE); + + dma_cookie_init(chan); + + ret = ipu_irq_map(chan->chan_id); + if (ret < 0) + goto eimap; + + ichan->eof_irq = ret; + + /* + * Important to first disable the channel, because maybe someone + * used it before us, e.g., the bootloader + */ + ipu_disable_channel(idmac, ichan, true); + + ret = ipu_init_channel(idmac, ichan); + if (ret < 0) + goto eichan; + + ret = request_irq(ichan->eof_irq, idmac_interrupt, 0, + ichan->eof_name, ichan); + if (ret < 0) + goto erirq; + +#ifdef DEBUG + if (chan->chan_id == IDMAC_IC_7) { + ic_sof = ipu_irq_map(69); + if (ic_sof > 0) { + ret = request_irq(ic_sof, ic_sof_irq, 0, "IC SOF", ichan); + if (ret) + dev_err(&chan->dev->device, "request irq failed for IC SOF"); + } + ic_eof = ipu_irq_map(70); + if (ic_eof > 0) { + ret = request_irq(ic_eof, ic_eof_irq, 0, "IC EOF", ichan); + if (ret) + dev_err(&chan->dev->device, "request irq failed for IC EOF"); + } + } +#endif + + ichan->status = IPU_CHANNEL_INITIALIZED; + + dev_dbg(&chan->dev->device, "Found channel 0x%x, irq %d\n", + chan->chan_id, ichan->eof_irq); + + return ret; + +erirq: + ipu_uninit_channel(idmac, ichan); +eichan: + ipu_irq_unmap(chan->chan_id); +eimap: + return ret; +} + +static void idmac_free_chan_resources(struct dma_chan *chan) +{ + struct idmac_channel *ichan = to_idmac_chan(chan); + struct idmac *idmac = to_idmac(chan->device); + + mutex_lock(&ichan->chan_mutex); + + __idmac_terminate_all(chan); + + if (ichan->status > IPU_CHANNEL_FREE) { +#ifdef DEBUG + if (chan->chan_id == IDMAC_IC_7) { + if (ic_sof > 0) { + free_irq(ic_sof, ichan); + ipu_irq_unmap(69); + ic_sof = -EINVAL; + } + if (ic_eof > 0) { + free_irq(ic_eof, ichan); + ipu_irq_unmap(70); + ic_eof = -EINVAL; + } + } +#endif + free_irq(ichan->eof_irq, ichan); + ipu_irq_unmap(chan->chan_id); + } + + ichan->status = IPU_CHANNEL_FREE; + + ipu_uninit_channel(idmac, ichan); + + mutex_unlock(&ichan->chan_mutex); + + tasklet_schedule(&to_ipu(idmac)->tasklet); +} + +static enum dma_status idmac_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + return dma_cookie_status(chan, cookie, txstate); +} + +static int __init ipu_idmac_init(struct ipu *ipu) +{ + struct idmac *idmac = &ipu->idmac; + struct dma_device *dma = &idmac->dma; + int i; + + dma_cap_set(DMA_SLAVE, dma->cap_mask); + dma_cap_set(DMA_PRIVATE, dma->cap_mask); + + /* Compulsory common fields */ + dma->dev = ipu->dev; + dma->device_alloc_chan_resources = idmac_alloc_chan_resources; + dma->device_free_chan_resources = idmac_free_chan_resources; + dma->device_tx_status = idmac_tx_status; + dma->device_issue_pending = idmac_issue_pending; + + /* Compulsory for DMA_SLAVE fields */ + dma->device_prep_slave_sg = idmac_prep_slave_sg; + dma->device_pause = idmac_pause; + dma->device_terminate_all = idmac_terminate_all; + + INIT_LIST_HEAD(&dma->channels); + for (i = 0; i < IPU_CHANNELS_NUM; i++) { + struct idmac_channel *ichan = ipu->channel + i; + struct dma_chan *dma_chan = &ichan->dma_chan; + + spin_lock_init(&ichan->lock); + mutex_init(&ichan->chan_mutex); + + ichan->status = IPU_CHANNEL_FREE; + ichan->sec_chan_en = false; + snprintf(ichan->eof_name, sizeof(ichan->eof_name), "IDMAC EOF %d", i); + + dma_chan->device = &idmac->dma; + dma_cookie_init(dma_chan); + dma_chan->chan_id = i; + list_add_tail(&dma_chan->device_node, &dma->channels); + } + + idmac_write_icreg(ipu, 0x00000070, IDMAC_CONF); + + return dma_async_device_register(&idmac->dma); +} + +static void ipu_idmac_exit(struct ipu *ipu) +{ + int i; + struct idmac *idmac = &ipu->idmac; + + for (i = 0; i < IPU_CHANNELS_NUM; i++) { + struct idmac_channel *ichan = ipu->channel + i; + + idmac_terminate_all(&ichan->dma_chan); + } + + dma_async_device_unregister(&idmac->dma); +} + +/***************************************************************************** + * IPU common probe / remove + */ + +static int __init ipu_probe(struct platform_device *pdev) +{ + struct resource *mem_ipu, *mem_ic; + int ret; + + spin_lock_init(&ipu_data.lock); + + mem_ipu = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mem_ic = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!mem_ipu || !mem_ic) + return -EINVAL; + + ipu_data.dev = &pdev->dev; + + platform_set_drvdata(pdev, &ipu_data); + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + goto err_noirq; + + ipu_data.irq_fn = ret; + ret = platform_get_irq(pdev, 1); + if (ret < 0) + goto err_noirq; + + ipu_data.irq_err = ret; + + dev_dbg(&pdev->dev, "fn irq %u, err irq %u\n", + ipu_data.irq_fn, ipu_data.irq_err); + + /* Remap IPU common registers */ + ipu_data.reg_ipu = ioremap(mem_ipu->start, resource_size(mem_ipu)); + if (!ipu_data.reg_ipu) { + ret = -ENOMEM; + goto err_ioremap_ipu; + } + + /* Remap Image Converter and Image DMA Controller registers */ + ipu_data.reg_ic = ioremap(mem_ic->start, resource_size(mem_ic)); + if (!ipu_data.reg_ic) { + ret = -ENOMEM; + goto err_ioremap_ic; + } + + /* Get IPU clock */ + ipu_data.ipu_clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(ipu_data.ipu_clk)) { + ret = PTR_ERR(ipu_data.ipu_clk); + goto err_clk_get; + } + + /* Make sure IPU HSP clock is running */ + clk_prepare_enable(ipu_data.ipu_clk); + + /* Disable all interrupts */ + idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_1); + idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_2); + idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_3); + idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_4); + idmac_write_ipureg(&ipu_data, 0, IPU_INT_CTRL_5); + + dev_dbg(&pdev->dev, "%s @ 0x%08lx, fn irq %u, err irq %u\n", pdev->name, + (unsigned long)mem_ipu->start, ipu_data.irq_fn, ipu_data.irq_err); + + ret = ipu_irq_attach_irq(&ipu_data, pdev); + if (ret < 0) + goto err_attach_irq; + + /* Initialize DMA engine */ + ret = ipu_idmac_init(&ipu_data); + if (ret < 0) + goto err_idmac_init; + + tasklet_init(&ipu_data.tasklet, ipu_gc_tasklet, (unsigned long)&ipu_data); + + ipu_data.dev = &pdev->dev; + + dev_dbg(ipu_data.dev, "IPU initialized\n"); + + return 0; + +err_idmac_init: +err_attach_irq: + ipu_irq_detach_irq(&ipu_data, pdev); + clk_disable_unprepare(ipu_data.ipu_clk); + clk_put(ipu_data.ipu_clk); +err_clk_get: + iounmap(ipu_data.reg_ic); +err_ioremap_ic: + iounmap(ipu_data.reg_ipu); +err_ioremap_ipu: +err_noirq: + dev_err(&pdev->dev, "Failed to probe IPU: %d\n", ret); + return ret; +} + +static int ipu_remove(struct platform_device *pdev) +{ + struct ipu *ipu = platform_get_drvdata(pdev); + + ipu_idmac_exit(ipu); + ipu_irq_detach_irq(ipu, pdev); + clk_disable_unprepare(ipu->ipu_clk); + clk_put(ipu->ipu_clk); + iounmap(ipu->reg_ic); + iounmap(ipu->reg_ipu); + tasklet_kill(&ipu->tasklet); + + return 0; +} + +/* + * We need two MEM resources - with IPU-common and Image Converter registers, + * including PF_CONF and IDMAC_* registers, and two IRQs - function and error + */ +static struct platform_driver ipu_platform_driver = { + .driver = { + .name = "ipu-core", + }, + .remove = ipu_remove, +}; + +static int __init ipu_init(void) +{ + return platform_driver_probe(&ipu_platform_driver, ipu_probe); +} +subsys_initcall(ipu_init); + +MODULE_DESCRIPTION("IPU core driver"); +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>"); +MODULE_ALIAS("platform:ipu-core"); diff --git a/drivers/dma/ipu/ipu_intern.h b/drivers/dma/ipu/ipu_intern.h new file mode 100644 index 000000000..545cf11a9 --- /dev/null +++ b/drivers/dma/ipu/ipu_intern.h @@ -0,0 +1,176 @@ +/* + * Copyright (C) 2008 + * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> + * + * Copyright (C) 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _IPU_INTERN_H_ +#define _IPU_INTERN_H_ + +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> + +/* IPU Common registers */ +#define IPU_CONF 0x00 +#define IPU_CHA_BUF0_RDY 0x04 +#define IPU_CHA_BUF1_RDY 0x08 +#define IPU_CHA_DB_MODE_SEL 0x0C +#define IPU_CHA_CUR_BUF 0x10 +#define IPU_FS_PROC_FLOW 0x14 +#define IPU_FS_DISP_FLOW 0x18 +#define IPU_TASKS_STAT 0x1C +#define IPU_IMA_ADDR 0x20 +#define IPU_IMA_DATA 0x24 +#define IPU_INT_CTRL_1 0x28 +#define IPU_INT_CTRL_2 0x2C +#define IPU_INT_CTRL_3 0x30 +#define IPU_INT_CTRL_4 0x34 +#define IPU_INT_CTRL_5 0x38 +#define IPU_INT_STAT_1 0x3C +#define IPU_INT_STAT_2 0x40 +#define IPU_INT_STAT_3 0x44 +#define IPU_INT_STAT_4 0x48 +#define IPU_INT_STAT_5 0x4C +#define IPU_BRK_CTRL_1 0x50 +#define IPU_BRK_CTRL_2 0x54 +#define IPU_BRK_STAT 0x58 +#define IPU_DIAGB_CTRL 0x5C + +/* IPU_CONF Register bits */ +#define IPU_CONF_CSI_EN 0x00000001 +#define IPU_CONF_IC_EN 0x00000002 +#define IPU_CONF_ROT_EN 0x00000004 +#define IPU_CONF_PF_EN 0x00000008 +#define IPU_CONF_SDC_EN 0x00000010 +#define IPU_CONF_ADC_EN 0x00000020 +#define IPU_CONF_DI_EN 0x00000040 +#define IPU_CONF_DU_EN 0x00000080 +#define IPU_CONF_PXL_ENDIAN 0x00000100 + +/* Image Converter Registers */ +#define IC_CONF 0x88 +#define IC_PRP_ENC_RSC 0x8C +#define IC_PRP_VF_RSC 0x90 +#define IC_PP_RSC 0x94 +#define IC_CMBP_1 0x98 +#define IC_CMBP_2 0x9C +#define PF_CONF 0xA0 +#define IDMAC_CONF 0xA4 +#define IDMAC_CHA_EN 0xA8 +#define IDMAC_CHA_PRI 0xAC +#define IDMAC_CHA_BUSY 0xB0 + +/* Image Converter Register bits */ +#define IC_CONF_PRPENC_EN 0x00000001 +#define IC_CONF_PRPENC_CSC1 0x00000002 +#define IC_CONF_PRPENC_ROT_EN 0x00000004 +#define IC_CONF_PRPVF_EN 0x00000100 +#define IC_CONF_PRPVF_CSC1 0x00000200 +#define IC_CONF_PRPVF_CSC2 0x00000400 +#define IC_CONF_PRPVF_CMB 0x00000800 +#define IC_CONF_PRPVF_ROT_EN 0x00001000 +#define IC_CONF_PP_EN 0x00010000 +#define IC_CONF_PP_CSC1 0x00020000 +#define IC_CONF_PP_CSC2 0x00040000 +#define IC_CONF_PP_CMB 0x00080000 +#define IC_CONF_PP_ROT_EN 0x00100000 +#define IC_CONF_IC_GLB_LOC_A 0x10000000 +#define IC_CONF_KEY_COLOR_EN 0x20000000 +#define IC_CONF_RWS_EN 0x40000000 +#define IC_CONF_CSI_MEM_WR_EN 0x80000000 + +#define IDMA_CHAN_INVALID 0x000000FF +#define IDMA_IC_0 0x00000001 +#define IDMA_IC_1 0x00000002 +#define IDMA_IC_2 0x00000004 +#define IDMA_IC_3 0x00000008 +#define IDMA_IC_4 0x00000010 +#define IDMA_IC_5 0x00000020 +#define IDMA_IC_6 0x00000040 +#define IDMA_IC_7 0x00000080 +#define IDMA_IC_8 0x00000100 +#define IDMA_IC_9 0x00000200 +#define IDMA_IC_10 0x00000400 +#define IDMA_IC_11 0x00000800 +#define IDMA_IC_12 0x00001000 +#define IDMA_IC_13 0x00002000 +#define IDMA_SDC_BG 0x00004000 +#define IDMA_SDC_FG 0x00008000 +#define IDMA_SDC_MASK 0x00010000 +#define IDMA_SDC_PARTIAL 0x00020000 +#define IDMA_ADC_SYS1_WR 0x00040000 +#define IDMA_ADC_SYS2_WR 0x00080000 +#define IDMA_ADC_SYS1_CMD 0x00100000 +#define IDMA_ADC_SYS2_CMD 0x00200000 +#define IDMA_ADC_SYS1_RD 0x00400000 +#define IDMA_ADC_SYS2_RD 0x00800000 +#define IDMA_PF_QP 0x01000000 +#define IDMA_PF_BSP 0x02000000 +#define IDMA_PF_Y_IN 0x04000000 +#define IDMA_PF_U_IN 0x08000000 +#define IDMA_PF_V_IN 0x10000000 +#define IDMA_PF_Y_OUT 0x20000000 +#define IDMA_PF_U_OUT 0x40000000 +#define IDMA_PF_V_OUT 0x80000000 + +#define TSTAT_PF_H264_PAUSE 0x00000001 +#define TSTAT_CSI2MEM_MASK 0x0000000C +#define TSTAT_CSI2MEM_OFFSET 2 +#define TSTAT_VF_MASK 0x00000600 +#define TSTAT_VF_OFFSET 9 +#define TSTAT_VF_ROT_MASK 0x000C0000 +#define TSTAT_VF_ROT_OFFSET 18 +#define TSTAT_ENC_MASK 0x00000180 +#define TSTAT_ENC_OFFSET 7 +#define TSTAT_ENC_ROT_MASK 0x00030000 +#define TSTAT_ENC_ROT_OFFSET 16 +#define TSTAT_PP_MASK 0x00001800 +#define TSTAT_PP_OFFSET 11 +#define TSTAT_PP_ROT_MASK 0x00300000 +#define TSTAT_PP_ROT_OFFSET 20 +#define TSTAT_PF_MASK 0x00C00000 +#define TSTAT_PF_OFFSET 22 +#define TSTAT_ADCSYS1_MASK 0x03000000 +#define TSTAT_ADCSYS1_OFFSET 24 +#define TSTAT_ADCSYS2_MASK 0x0C000000 +#define TSTAT_ADCSYS2_OFFSET 26 + +#define TASK_STAT_IDLE 0 +#define TASK_STAT_ACTIVE 1 +#define TASK_STAT_WAIT4READY 2 + +struct idmac { + struct dma_device dma; +}; + +struct ipu { + void __iomem *reg_ipu; + void __iomem *reg_ic; + unsigned int irq_fn; /* IPU Function IRQ to the CPU */ + unsigned int irq_err; /* IPU Error IRQ to the CPU */ + unsigned int irq_base; /* Beginning of the IPU IRQ range */ + unsigned long channel_init_mask; + spinlock_t lock; + struct clk *ipu_clk; + struct device *dev; + struct idmac idmac; + struct idmac_channel channel[IPU_CHANNELS_NUM]; + struct tasklet_struct tasklet; +}; + +#define to_idmac(d) container_of(d, struct idmac, dma) + +extern int ipu_irq_attach_irq(struct ipu *ipu, struct platform_device *dev); +extern void ipu_irq_detach_irq(struct ipu *ipu, struct platform_device *dev); + +extern bool ipu_irq_status(uint32_t irq); +extern int ipu_irq_map(unsigned int source); +extern int ipu_irq_unmap(unsigned int source); + +#endif diff --git a/drivers/dma/ipu/ipu_irq.c b/drivers/dma/ipu/ipu_irq.c new file mode 100644 index 000000000..2e284a443 --- /dev/null +++ b/drivers/dma/ipu/ipu_irq.c @@ -0,0 +1,415 @@ +/* + * Copyright (C) 2008 + * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/err.h> +#include <linux/spinlock.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/dma/ipu-dma.h> + +#include "ipu_intern.h" + +/* + * Register read / write - shall be inlined by the compiler + */ +static u32 ipu_read_reg(struct ipu *ipu, unsigned long reg) +{ + return __raw_readl(ipu->reg_ipu + reg); +} + +static void ipu_write_reg(struct ipu *ipu, u32 value, unsigned long reg) +{ + __raw_writel(value, ipu->reg_ipu + reg); +} + + +/* + * IPU IRQ chip driver + */ + +#define IPU_IRQ_NR_FN_BANKS 3 +#define IPU_IRQ_NR_ERR_BANKS 2 +#define IPU_IRQ_NR_BANKS (IPU_IRQ_NR_FN_BANKS + IPU_IRQ_NR_ERR_BANKS) + +struct ipu_irq_bank { + unsigned int control; + unsigned int status; + struct ipu *ipu; +}; + +static struct ipu_irq_bank irq_bank[IPU_IRQ_NR_BANKS] = { + /* 3 groups of functional interrupts */ + { + .control = IPU_INT_CTRL_1, + .status = IPU_INT_STAT_1, + }, { + .control = IPU_INT_CTRL_2, + .status = IPU_INT_STAT_2, + }, { + .control = IPU_INT_CTRL_3, + .status = IPU_INT_STAT_3, + }, + /* 2 groups of error interrupts */ + { + .control = IPU_INT_CTRL_4, + .status = IPU_INT_STAT_4, + }, { + .control = IPU_INT_CTRL_5, + .status = IPU_INT_STAT_5, + }, +}; + +struct ipu_irq_map { + unsigned int irq; + int source; + struct ipu_irq_bank *bank; + struct ipu *ipu; +}; + +static struct ipu_irq_map irq_map[CONFIG_MX3_IPU_IRQS]; +/* Protects allocations from the above array of maps */ +static DEFINE_MUTEX(map_lock); +/* Protects register accesses and individual mappings */ +static DEFINE_RAW_SPINLOCK(bank_lock); + +static struct ipu_irq_map *src2map(unsigned int src) +{ + int i; + + for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++) + if (irq_map[i].source == src) + return irq_map + i; + + return NULL; +} + +static void ipu_irq_unmask(struct irq_data *d) +{ + struct ipu_irq_map *map = irq_data_get_irq_chip_data(d); + struct ipu_irq_bank *bank; + uint32_t reg; + unsigned long lock_flags; + + raw_spin_lock_irqsave(&bank_lock, lock_flags); + + bank = map->bank; + if (!bank) { + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); + pr_err("IPU: %s(%u) - unmapped!\n", __func__, d->irq); + return; + } + + reg = ipu_read_reg(bank->ipu, bank->control); + reg |= (1UL << (map->source & 31)); + ipu_write_reg(bank->ipu, reg, bank->control); + + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); +} + +static void ipu_irq_mask(struct irq_data *d) +{ + struct ipu_irq_map *map = irq_data_get_irq_chip_data(d); + struct ipu_irq_bank *bank; + uint32_t reg; + unsigned long lock_flags; + + raw_spin_lock_irqsave(&bank_lock, lock_flags); + + bank = map->bank; + if (!bank) { + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); + pr_err("IPU: %s(%u) - unmapped!\n", __func__, d->irq); + return; + } + + reg = ipu_read_reg(bank->ipu, bank->control); + reg &= ~(1UL << (map->source & 31)); + ipu_write_reg(bank->ipu, reg, bank->control); + + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); +} + +static void ipu_irq_ack(struct irq_data *d) +{ + struct ipu_irq_map *map = irq_data_get_irq_chip_data(d); + struct ipu_irq_bank *bank; + unsigned long lock_flags; + + raw_spin_lock_irqsave(&bank_lock, lock_flags); + + bank = map->bank; + if (!bank) { + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); + pr_err("IPU: %s(%u) - unmapped!\n", __func__, d->irq); + return; + } + + ipu_write_reg(bank->ipu, 1UL << (map->source & 31), bank->status); + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); +} + +/** + * ipu_irq_status() - returns the current interrupt status of the specified IRQ. + * @irq: interrupt line to get status for. + * @return: true if the interrupt is pending/asserted or false if the + * interrupt is not pending. + */ +bool ipu_irq_status(unsigned int irq) +{ + struct ipu_irq_map *map = irq_get_chip_data(irq); + struct ipu_irq_bank *bank; + unsigned long lock_flags; + bool ret; + + raw_spin_lock_irqsave(&bank_lock, lock_flags); + bank = map->bank; + ret = bank && ipu_read_reg(bank->ipu, bank->status) & + (1UL << (map->source & 31)); + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); + + return ret; +} + +/** + * ipu_irq_map() - map an IPU interrupt source to an IRQ number + * @source: interrupt source bit position (see below) + * @return: mapped IRQ number or negative error code + * + * The source parameter has to be explained further. On i.MX31 IPU has 137 IRQ + * sources, they are broken down in 5 32-bit registers, like 32, 32, 24, 32, 17. + * However, the source argument of this function is not the sequence number of + * the possible IRQ, but rather its bit position. So, first interrupt in fourth + * register has source number 96, and not 88. This makes calculations easier, + * and also provides forward compatibility with any future IPU implementations + * with any interrupt bit assignments. + */ +int ipu_irq_map(unsigned int source) +{ + int i, ret = -ENOMEM; + struct ipu_irq_map *map; + + might_sleep(); + + mutex_lock(&map_lock); + map = src2map(source); + if (map) { + pr_err("IPU: Source %u already mapped to IRQ %u\n", source, map->irq); + ret = -EBUSY; + goto out; + } + + for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++) { + if (irq_map[i].source < 0) { + unsigned long lock_flags; + + raw_spin_lock_irqsave(&bank_lock, lock_flags); + irq_map[i].source = source; + irq_map[i].bank = irq_bank + source / 32; + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); + + ret = irq_map[i].irq; + pr_debug("IPU: mapped source %u to IRQ %u\n", + source, ret); + break; + } + } +out: + mutex_unlock(&map_lock); + + if (ret < 0) + pr_err("IPU: couldn't map source %u: %d\n", source, ret); + + return ret; +} + +/** + * ipu_irq_map() - map an IPU interrupt source to an IRQ number + * @source: interrupt source bit position (see ipu_irq_map()) + * @return: 0 or negative error code + */ +int ipu_irq_unmap(unsigned int source) +{ + int i, ret = -EINVAL; + + might_sleep(); + + mutex_lock(&map_lock); + for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++) { + if (irq_map[i].source == source) { + unsigned long lock_flags; + + pr_debug("IPU: unmapped source %u from IRQ %u\n", + source, irq_map[i].irq); + + raw_spin_lock_irqsave(&bank_lock, lock_flags); + irq_map[i].source = -EINVAL; + irq_map[i].bank = NULL; + raw_spin_unlock_irqrestore(&bank_lock, lock_flags); + + ret = 0; + break; + } + } + mutex_unlock(&map_lock); + + return ret; +} + +/* Chained IRQ handler for IPU error interrupt */ +static void ipu_irq_err(unsigned int irq, struct irq_desc *desc) +{ + struct ipu *ipu = irq_get_handler_data(irq); + u32 status; + int i, line; + + for (i = IPU_IRQ_NR_FN_BANKS; i < IPU_IRQ_NR_BANKS; i++) { + struct ipu_irq_bank *bank = irq_bank + i; + + raw_spin_lock(&bank_lock); + status = ipu_read_reg(ipu, bank->status); + /* + * Don't think we have to clear all interrupts here, they will + * be acked by ->handle_irq() (handle_level_irq). However, we + * might want to clear unhandled interrupts after the loop... + */ + status &= ipu_read_reg(ipu, bank->control); + raw_spin_unlock(&bank_lock); + while ((line = ffs(status))) { + struct ipu_irq_map *map; + + line--; + status &= ~(1UL << line); + + raw_spin_lock(&bank_lock); + map = src2map(32 * i + line); + if (map) + irq = map->irq; + raw_spin_unlock(&bank_lock); + + if (!map) { + pr_err("IPU: Interrupt on unmapped source %u bank %d\n", + line, i); + continue; + } + generic_handle_irq(irq); + } + } +} + +/* Chained IRQ handler for IPU function interrupt */ +static void ipu_irq_fn(unsigned int irq, struct irq_desc *desc) +{ + struct ipu *ipu = irq_desc_get_handler_data(desc); + u32 status; + int i, line; + + for (i = 0; i < IPU_IRQ_NR_FN_BANKS; i++) { + struct ipu_irq_bank *bank = irq_bank + i; + + raw_spin_lock(&bank_lock); + status = ipu_read_reg(ipu, bank->status); + /* Not clearing all interrupts, see above */ + status &= ipu_read_reg(ipu, bank->control); + raw_spin_unlock(&bank_lock); + while ((line = ffs(status))) { + struct ipu_irq_map *map; + + line--; + status &= ~(1UL << line); + + raw_spin_lock(&bank_lock); + map = src2map(32 * i + line); + if (map) + irq = map->irq; + raw_spin_unlock(&bank_lock); + + if (!map) { + pr_err("IPU: Interrupt on unmapped source %u bank %d\n", + line, i); + continue; + } + generic_handle_irq(irq); + } + } +} + +static struct irq_chip ipu_irq_chip = { + .name = "ipu_irq", + .irq_ack = ipu_irq_ack, + .irq_mask = ipu_irq_mask, + .irq_unmask = ipu_irq_unmask, +}; + +/* Install the IRQ handler */ +int __init ipu_irq_attach_irq(struct ipu *ipu, struct platform_device *dev) +{ + unsigned int irq, i; + int irq_base = irq_alloc_descs(-1, 0, CONFIG_MX3_IPU_IRQS, + numa_node_id()); + + if (irq_base < 0) + return irq_base; + + for (i = 0; i < IPU_IRQ_NR_BANKS; i++) + irq_bank[i].ipu = ipu; + + for (i = 0; i < CONFIG_MX3_IPU_IRQS; i++) { + int ret; + + irq = irq_base + i; + ret = irq_set_chip(irq, &ipu_irq_chip); + if (ret < 0) + return ret; + ret = irq_set_chip_data(irq, irq_map + i); + if (ret < 0) + return ret; + irq_map[i].ipu = ipu; + irq_map[i].irq = irq; + irq_map[i].source = -EINVAL; + irq_set_handler(irq, handle_level_irq); +#ifdef CONFIG_ARM + set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); +#endif + } + + irq_set_handler_data(ipu->irq_fn, ipu); + irq_set_chained_handler(ipu->irq_fn, ipu_irq_fn); + + irq_set_handler_data(ipu->irq_err, ipu); + irq_set_chained_handler(ipu->irq_err, ipu_irq_err); + + ipu->irq_base = irq_base; + + return 0; +} + +void ipu_irq_detach_irq(struct ipu *ipu, struct platform_device *dev) +{ + unsigned int irq, irq_base; + + irq_base = ipu->irq_base; + + irq_set_chained_handler(ipu->irq_fn, NULL); + irq_set_handler_data(ipu->irq_fn, NULL); + + irq_set_chained_handler(ipu->irq_err, NULL); + irq_set_handler_data(ipu->irq_err, NULL); + + for (irq = irq_base; irq < irq_base + CONFIG_MX3_IPU_IRQS; irq++) { +#ifdef CONFIG_ARM + set_irq_flags(irq, 0); +#endif + irq_set_chip(irq, NULL); + irq_set_chip_data(irq, NULL); + } +} diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c new file mode 100644 index 000000000..647e362f0 --- /dev/null +++ b/drivers/dma/k3dma.c @@ -0,0 +1,848 @@ +/* + * Copyright (c) 2013 Linaro Ltd. + * Copyright (c) 2013 Hisilicon Limited. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/sched.h> +#include <linux/device.h> +#include <linux/dmaengine.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/of_device.h> +#include <linux/of.h> +#include <linux/clk.h> +#include <linux/of_dma.h> + +#include "virt-dma.h" + +#define DRIVER_NAME "k3-dma" +#define DMA_ALIGN 3 +#define DMA_MAX_SIZE 0x1ffc + +#define INT_STAT 0x00 +#define INT_TC1 0x04 +#define INT_ERR1 0x0c +#define INT_ERR2 0x10 +#define INT_TC1_MASK 0x18 +#define INT_ERR1_MASK 0x20 +#define INT_ERR2_MASK 0x24 +#define INT_TC1_RAW 0x600 +#define INT_ERR1_RAW 0x608 +#define INT_ERR2_RAW 0x610 +#define CH_PRI 0x688 +#define CH_STAT 0x690 +#define CX_CUR_CNT 0x704 +#define CX_LLI 0x800 +#define CX_CNT 0x810 +#define CX_SRC 0x814 +#define CX_DST 0x818 +#define CX_CFG 0x81c +#define AXI_CFG 0x820 +#define AXI_CFG_DEFAULT 0x201201 + +#define CX_LLI_CHAIN_EN 0x2 +#define CX_CFG_EN 0x1 +#define CX_CFG_MEM2PER (0x1 << 2) +#define CX_CFG_PER2MEM (0x2 << 2) +#define CX_CFG_SRCINCR (0x1 << 31) +#define CX_CFG_DSTINCR (0x1 << 30) + +struct k3_desc_hw { + u32 lli; + u32 reserved[3]; + u32 count; + u32 saddr; + u32 daddr; + u32 config; +} __aligned(32); + +struct k3_dma_desc_sw { + struct virt_dma_desc vd; + dma_addr_t desc_hw_lli; + size_t desc_num; + size_t size; + struct k3_desc_hw desc_hw[0]; +}; + +struct k3_dma_phy; + +struct k3_dma_chan { + u32 ccfg; + struct virt_dma_chan vc; + struct k3_dma_phy *phy; + struct list_head node; + enum dma_transfer_direction dir; + dma_addr_t dev_addr; + enum dma_status status; +}; + +struct k3_dma_phy { + u32 idx; + void __iomem *base; + struct k3_dma_chan *vchan; + struct k3_dma_desc_sw *ds_run; + struct k3_dma_desc_sw *ds_done; +}; + +struct k3_dma_dev { + struct dma_device slave; + void __iomem *base; + struct tasklet_struct task; + spinlock_t lock; + struct list_head chan_pending; + struct k3_dma_phy *phy; + struct k3_dma_chan *chans; + struct clk *clk; + u32 dma_channels; + u32 dma_requests; +}; + +#define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave) + +static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan) +{ + return container_of(chan, struct k3_dma_chan, vc.chan); +} + +static void k3_dma_pause_dma(struct k3_dma_phy *phy, bool on) +{ + u32 val = 0; + + if (on) { + val = readl_relaxed(phy->base + CX_CFG); + val |= CX_CFG_EN; + writel_relaxed(val, phy->base + CX_CFG); + } else { + val = readl_relaxed(phy->base + CX_CFG); + val &= ~CX_CFG_EN; + writel_relaxed(val, phy->base + CX_CFG); + } +} + +static void k3_dma_terminate_chan(struct k3_dma_phy *phy, struct k3_dma_dev *d) +{ + u32 val = 0; + + k3_dma_pause_dma(phy, false); + + val = 0x1 << phy->idx; + writel_relaxed(val, d->base + INT_TC1_RAW); + writel_relaxed(val, d->base + INT_ERR1_RAW); + writel_relaxed(val, d->base + INT_ERR2_RAW); +} + +static void k3_dma_set_desc(struct k3_dma_phy *phy, struct k3_desc_hw *hw) +{ + writel_relaxed(hw->lli, phy->base + CX_LLI); + writel_relaxed(hw->count, phy->base + CX_CNT); + writel_relaxed(hw->saddr, phy->base + CX_SRC); + writel_relaxed(hw->daddr, phy->base + CX_DST); + writel_relaxed(AXI_CFG_DEFAULT, phy->base + AXI_CFG); + writel_relaxed(hw->config, phy->base + CX_CFG); +} + +static u32 k3_dma_get_curr_cnt(struct k3_dma_dev *d, struct k3_dma_phy *phy) +{ + u32 cnt = 0; + + cnt = readl_relaxed(d->base + CX_CUR_CNT + phy->idx * 0x10); + cnt &= 0xffff; + return cnt; +} + +static u32 k3_dma_get_curr_lli(struct k3_dma_phy *phy) +{ + return readl_relaxed(phy->base + CX_LLI); +} + +static u32 k3_dma_get_chan_stat(struct k3_dma_dev *d) +{ + return readl_relaxed(d->base + CH_STAT); +} + +static void k3_dma_enable_dma(struct k3_dma_dev *d, bool on) +{ + if (on) { + /* set same priority */ + writel_relaxed(0x0, d->base + CH_PRI); + + /* unmask irq */ + writel_relaxed(0xffff, d->base + INT_TC1_MASK); + writel_relaxed(0xffff, d->base + INT_ERR1_MASK); + writel_relaxed(0xffff, d->base + INT_ERR2_MASK); + } else { + /* mask irq */ + writel_relaxed(0x0, d->base + INT_TC1_MASK); + writel_relaxed(0x0, d->base + INT_ERR1_MASK); + writel_relaxed(0x0, d->base + INT_ERR2_MASK); + } +} + +static irqreturn_t k3_dma_int_handler(int irq, void *dev_id) +{ + struct k3_dma_dev *d = (struct k3_dma_dev *)dev_id; + struct k3_dma_phy *p; + struct k3_dma_chan *c; + u32 stat = readl_relaxed(d->base + INT_STAT); + u32 tc1 = readl_relaxed(d->base + INT_TC1); + u32 err1 = readl_relaxed(d->base + INT_ERR1); + u32 err2 = readl_relaxed(d->base + INT_ERR2); + u32 i, irq_chan = 0; + + while (stat) { + i = __ffs(stat); + stat &= (stat - 1); + if (likely(tc1 & BIT(i))) { + p = &d->phy[i]; + c = p->vchan; + if (c) { + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + vchan_cookie_complete(&p->ds_run->vd); + p->ds_done = p->ds_run; + spin_unlock_irqrestore(&c->vc.lock, flags); + } + irq_chan |= BIT(i); + } + if (unlikely((err1 & BIT(i)) || (err2 & BIT(i)))) + dev_warn(d->slave.dev, "DMA ERR\n"); + } + + writel_relaxed(irq_chan, d->base + INT_TC1_RAW); + writel_relaxed(err1, d->base + INT_ERR1_RAW); + writel_relaxed(err2, d->base + INT_ERR2_RAW); + + if (irq_chan) { + tasklet_schedule(&d->task); + return IRQ_HANDLED; + } else + return IRQ_NONE; +} + +static int k3_dma_start_txd(struct k3_dma_chan *c) +{ + struct k3_dma_dev *d = to_k3_dma(c->vc.chan.device); + struct virt_dma_desc *vd = vchan_next_desc(&c->vc); + + if (!c->phy) + return -EAGAIN; + + if (BIT(c->phy->idx) & k3_dma_get_chan_stat(d)) + return -EAGAIN; + + if (vd) { + struct k3_dma_desc_sw *ds = + container_of(vd, struct k3_dma_desc_sw, vd); + /* + * fetch and remove request from vc->desc_issued + * so vc->desc_issued only contains desc pending + */ + list_del(&ds->vd.node); + c->phy->ds_run = ds; + c->phy->ds_done = NULL; + /* start dma */ + k3_dma_set_desc(c->phy, &ds->desc_hw[0]); + return 0; + } + c->phy->ds_done = NULL; + c->phy->ds_run = NULL; + return -EAGAIN; +} + +static void k3_dma_tasklet(unsigned long arg) +{ + struct k3_dma_dev *d = (struct k3_dma_dev *)arg; + struct k3_dma_phy *p; + struct k3_dma_chan *c, *cn; + unsigned pch, pch_alloc = 0; + + /* check new dma request of running channel in vc->desc_issued */ + list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) { + spin_lock_irq(&c->vc.lock); + p = c->phy; + if (p && p->ds_done) { + if (k3_dma_start_txd(c)) { + /* No current txd associated with this channel */ + dev_dbg(d->slave.dev, "pchan %u: free\n", p->idx); + /* Mark this channel free */ + c->phy = NULL; + p->vchan = NULL; + } + } + spin_unlock_irq(&c->vc.lock); + } + + /* check new channel request in d->chan_pending */ + spin_lock_irq(&d->lock); + for (pch = 0; pch < d->dma_channels; pch++) { + p = &d->phy[pch]; + + if (p->vchan == NULL && !list_empty(&d->chan_pending)) { + c = list_first_entry(&d->chan_pending, + struct k3_dma_chan, node); + /* remove from d->chan_pending */ + list_del_init(&c->node); + pch_alloc |= 1 << pch; + /* Mark this channel allocated */ + p->vchan = c; + c->phy = p; + dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc); + } + } + spin_unlock_irq(&d->lock); + + for (pch = 0; pch < d->dma_channels; pch++) { + if (pch_alloc & (1 << pch)) { + p = &d->phy[pch]; + c = p->vchan; + if (c) { + spin_lock_irq(&c->vc.lock); + k3_dma_start_txd(c); + spin_unlock_irq(&c->vc.lock); + } + } + } +} + +static void k3_dma_free_chan_resources(struct dma_chan *chan) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + unsigned long flags; + + spin_lock_irqsave(&d->lock, flags); + list_del_init(&c->node); + spin_unlock_irqrestore(&d->lock, flags); + + vchan_free_chan_resources(&c->vc); + c->ccfg = 0; +} + +static enum dma_status k3_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + struct k3_dma_phy *p; + struct virt_dma_desc *vd; + unsigned long flags; + enum dma_status ret; + size_t bytes = 0; + + ret = dma_cookie_status(&c->vc.chan, cookie, state); + if (ret == DMA_COMPLETE) + return ret; + + spin_lock_irqsave(&c->vc.lock, flags); + p = c->phy; + ret = c->status; + + /* + * If the cookie is on our issue queue, then the residue is + * its total size. + */ + vd = vchan_find_desc(&c->vc, cookie); + if (vd) { + bytes = container_of(vd, struct k3_dma_desc_sw, vd)->size; + } else if ((!p) || (!p->ds_run)) { + bytes = 0; + } else { + struct k3_dma_desc_sw *ds = p->ds_run; + u32 clli = 0, index = 0; + + bytes = k3_dma_get_curr_cnt(d, p); + clli = k3_dma_get_curr_lli(p); + index = (clli - ds->desc_hw_lli) / sizeof(struct k3_desc_hw); + for (; index < ds->desc_num; index++) { + bytes += ds->desc_hw[index].count; + /* end of lli */ + if (!ds->desc_hw[index].lli) + break; + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); + dma_set_residue(state, bytes); + return ret; +} + +static void k3_dma_issue_pending(struct dma_chan *chan) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + /* add request to vc->desc_issued */ + if (vchan_issue_pending(&c->vc)) { + spin_lock(&d->lock); + if (!c->phy) { + if (list_empty(&c->node)) { + /* if new channel, add chan_pending */ + list_add_tail(&c->node, &d->chan_pending); + /* check in tasklet */ + tasklet_schedule(&d->task); + dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc); + } + } + spin_unlock(&d->lock); + } else + dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc); + spin_unlock_irqrestore(&c->vc.lock, flags); +} + +static void k3_dma_fill_desc(struct k3_dma_desc_sw *ds, dma_addr_t dst, + dma_addr_t src, size_t len, u32 num, u32 ccfg) +{ + if ((num + 1) < ds->desc_num) + ds->desc_hw[num].lli = ds->desc_hw_lli + (num + 1) * + sizeof(struct k3_desc_hw); + ds->desc_hw[num].lli |= CX_LLI_CHAIN_EN; + ds->desc_hw[num].count = len; + ds->desc_hw[num].saddr = src; + ds->desc_hw[num].daddr = dst; + ds->desc_hw[num].config = ccfg; +} + +static struct dma_async_tx_descriptor *k3_dma_prep_memcpy( + struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_desc_sw *ds; + size_t copy = 0; + int num = 0; + + if (!len) + return NULL; + + num = DIV_ROUND_UP(len, DMA_MAX_SIZE); + ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC); + if (!ds) { + dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc); + return NULL; + } + ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]); + ds->size = len; + ds->desc_num = num; + num = 0; + + if (!c->ccfg) { + /* default is memtomem, without calling device_config */ + c->ccfg = CX_CFG_SRCINCR | CX_CFG_DSTINCR | CX_CFG_EN; + c->ccfg |= (0xf << 20) | (0xf << 24); /* burst = 16 */ + c->ccfg |= (0x3 << 12) | (0x3 << 16); /* width = 64 bit */ + } + + do { + copy = min_t(size_t, len, DMA_MAX_SIZE); + k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg); + + if (c->dir == DMA_MEM_TO_DEV) { + src += copy; + } else if (c->dir == DMA_DEV_TO_MEM) { + dst += copy; + } else { + src += copy; + dst += copy; + } + len -= copy; + } while (len); + + ds->desc_hw[num-1].lli = 0; /* end of link */ + return vchan_tx_prep(&c->vc, &ds->vd, flags); +} + +static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, unsigned int sglen, + enum dma_transfer_direction dir, unsigned long flags, void *context) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_desc_sw *ds; + size_t len, avail, total = 0; + struct scatterlist *sg; + dma_addr_t addr, src = 0, dst = 0; + int num = sglen, i; + + if (sgl == NULL) + return NULL; + + for_each_sg(sgl, sg, sglen, i) { + avail = sg_dma_len(sg); + if (avail > DMA_MAX_SIZE) + num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1; + } + + ds = kzalloc(sizeof(*ds) + num * sizeof(ds->desc_hw[0]), GFP_ATOMIC); + if (!ds) { + dev_dbg(chan->device->dev, "vchan %p: kzalloc fail\n", &c->vc); + return NULL; + } + ds->desc_hw_lli = __virt_to_phys((unsigned long)&ds->desc_hw[0]); + ds->desc_num = num; + num = 0; + + for_each_sg(sgl, sg, sglen, i) { + addr = sg_dma_address(sg); + avail = sg_dma_len(sg); + total += avail; + + do { + len = min_t(size_t, avail, DMA_MAX_SIZE); + + if (dir == DMA_MEM_TO_DEV) { + src = addr; + dst = c->dev_addr; + } else if (dir == DMA_DEV_TO_MEM) { + src = c->dev_addr; + dst = addr; + } + + k3_dma_fill_desc(ds, dst, src, len, num++, c->ccfg); + + addr += len; + avail -= len; + } while (avail); + } + + ds->desc_hw[num-1].lli = 0; /* end of link */ + ds->size = total; + return vchan_tx_prep(&c->vc, &ds->vd, flags); +} + +static int k3_dma_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + u32 maxburst = 0, val = 0; + enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + + if (cfg == NULL) + return -EINVAL; + c->dir = cfg->direction; + if (c->dir == DMA_DEV_TO_MEM) { + c->ccfg = CX_CFG_DSTINCR; + c->dev_addr = cfg->src_addr; + maxburst = cfg->src_maxburst; + width = cfg->src_addr_width; + } else if (c->dir == DMA_MEM_TO_DEV) { + c->ccfg = CX_CFG_SRCINCR; + c->dev_addr = cfg->dst_addr; + maxburst = cfg->dst_maxburst; + width = cfg->dst_addr_width; + } + switch (width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + case DMA_SLAVE_BUSWIDTH_2_BYTES: + case DMA_SLAVE_BUSWIDTH_4_BYTES: + case DMA_SLAVE_BUSWIDTH_8_BYTES: + val = __ffs(width); + break; + default: + val = 3; + break; + } + c->ccfg |= (val << 12) | (val << 16); + + if ((maxburst == 0) || (maxburst > 16)) + val = 16; + else + val = maxburst - 1; + c->ccfg |= (val << 20) | (val << 24); + c->ccfg |= CX_CFG_MEM2PER | CX_CFG_EN; + + /* specific request line */ + c->ccfg |= c->vc.chan.chan_id << 4; + + return 0; +} + +static int k3_dma_terminate_all(struct dma_chan *chan) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + struct k3_dma_phy *p = c->phy; + unsigned long flags; + LIST_HEAD(head); + + dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc); + + /* Prevent this channel being scheduled */ + spin_lock(&d->lock); + list_del_init(&c->node); + spin_unlock(&d->lock); + + /* Clear the tx descriptor lists */ + spin_lock_irqsave(&c->vc.lock, flags); + vchan_get_all_descriptors(&c->vc, &head); + if (p) { + /* vchan is assigned to a pchan - stop the channel */ + k3_dma_terminate_chan(p, d); + c->phy = NULL; + p->vchan = NULL; + p->ds_run = p->ds_done = NULL; + } + spin_unlock_irqrestore(&c->vc.lock, flags); + vchan_dma_desc_free_list(&c->vc, &head); + + return 0; +} + +static int k3_dma_transfer_pause(struct dma_chan *chan) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + struct k3_dma_phy *p = c->phy; + + dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc); + if (c->status == DMA_IN_PROGRESS) { + c->status = DMA_PAUSED; + if (p) { + k3_dma_pause_dma(p, false); + } else { + spin_lock(&d->lock); + list_del_init(&c->node); + spin_unlock(&d->lock); + } + } + + return 0; +} + +static int k3_dma_transfer_resume(struct dma_chan *chan) +{ + struct k3_dma_chan *c = to_k3_chan(chan); + struct k3_dma_dev *d = to_k3_dma(chan->device); + struct k3_dma_phy *p = c->phy; + unsigned long flags; + + dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc); + spin_lock_irqsave(&c->vc.lock, flags); + if (c->status == DMA_PAUSED) { + c->status = DMA_IN_PROGRESS; + if (p) { + k3_dma_pause_dma(p, true); + } else if (!list_empty(&c->vc.desc_issued)) { + spin_lock(&d->lock); + list_add_tail(&c->node, &d->chan_pending); + spin_unlock(&d->lock); + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); + + return 0; +} + +static void k3_dma_free_desc(struct virt_dma_desc *vd) +{ + struct k3_dma_desc_sw *ds = + container_of(vd, struct k3_dma_desc_sw, vd); + + kfree(ds); +} + +static const struct of_device_id k3_pdma_dt_ids[] = { + { .compatible = "hisilicon,k3-dma-1.0", }, + {} +}; +MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids); + +static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct k3_dma_dev *d = ofdma->of_dma_data; + unsigned int request = dma_spec->args[0]; + + if (request > d->dma_requests) + return NULL; + + return dma_get_slave_channel(&(d->chans[request].vc.chan)); +} + +static int k3_dma_probe(struct platform_device *op) +{ + struct k3_dma_dev *d; + const struct of_device_id *of_id; + struct resource *iores; + int i, ret, irq = 0; + + iores = platform_get_resource(op, IORESOURCE_MEM, 0); + if (!iores) + return -EINVAL; + + d = devm_kzalloc(&op->dev, sizeof(*d), GFP_KERNEL); + if (!d) + return -ENOMEM; + + d->base = devm_ioremap_resource(&op->dev, iores); + if (IS_ERR(d->base)) + return PTR_ERR(d->base); + + of_id = of_match_device(k3_pdma_dt_ids, &op->dev); + if (of_id) { + of_property_read_u32((&op->dev)->of_node, + "dma-channels", &d->dma_channels); + of_property_read_u32((&op->dev)->of_node, + "dma-requests", &d->dma_requests); + } + + d->clk = devm_clk_get(&op->dev, NULL); + if (IS_ERR(d->clk)) { + dev_err(&op->dev, "no dma clk\n"); + return PTR_ERR(d->clk); + } + + irq = platform_get_irq(op, 0); + ret = devm_request_irq(&op->dev, irq, + k3_dma_int_handler, 0, DRIVER_NAME, d); + if (ret) + return ret; + + /* init phy channel */ + d->phy = devm_kzalloc(&op->dev, + d->dma_channels * sizeof(struct k3_dma_phy), GFP_KERNEL); + if (d->phy == NULL) + return -ENOMEM; + + for (i = 0; i < d->dma_channels; i++) { + struct k3_dma_phy *p = &d->phy[i]; + + p->idx = i; + p->base = d->base + i * 0x40; + } + + INIT_LIST_HEAD(&d->slave.channels); + dma_cap_set(DMA_SLAVE, d->slave.cap_mask); + dma_cap_set(DMA_MEMCPY, d->slave.cap_mask); + d->slave.dev = &op->dev; + d->slave.device_free_chan_resources = k3_dma_free_chan_resources; + d->slave.device_tx_status = k3_dma_tx_status; + d->slave.device_prep_dma_memcpy = k3_dma_prep_memcpy; + d->slave.device_prep_slave_sg = k3_dma_prep_slave_sg; + d->slave.device_issue_pending = k3_dma_issue_pending; + d->slave.device_config = k3_dma_config; + d->slave.device_pause = k3_dma_transfer_pause; + d->slave.device_resume = k3_dma_transfer_resume; + d->slave.device_terminate_all = k3_dma_terminate_all; + d->slave.copy_align = DMA_ALIGN; + + /* init virtual channel */ + d->chans = devm_kzalloc(&op->dev, + d->dma_requests * sizeof(struct k3_dma_chan), GFP_KERNEL); + if (d->chans == NULL) + return -ENOMEM; + + for (i = 0; i < d->dma_requests; i++) { + struct k3_dma_chan *c = &d->chans[i]; + + c->status = DMA_IN_PROGRESS; + INIT_LIST_HEAD(&c->node); + c->vc.desc_free = k3_dma_free_desc; + vchan_init(&c->vc, &d->slave); + } + + /* Enable clock before accessing registers */ + ret = clk_prepare_enable(d->clk); + if (ret < 0) { + dev_err(&op->dev, "clk_prepare_enable failed: %d\n", ret); + return ret; + } + + k3_dma_enable_dma(d, true); + + ret = dma_async_device_register(&d->slave); + if (ret) + return ret; + + ret = of_dma_controller_register((&op->dev)->of_node, + k3_of_dma_simple_xlate, d); + if (ret) + goto of_dma_register_fail; + + spin_lock_init(&d->lock); + INIT_LIST_HEAD(&d->chan_pending); + tasklet_init(&d->task, k3_dma_tasklet, (unsigned long)d); + platform_set_drvdata(op, d); + dev_info(&op->dev, "initialized\n"); + + return 0; + +of_dma_register_fail: + dma_async_device_unregister(&d->slave); + return ret; +} + +static int k3_dma_remove(struct platform_device *op) +{ + struct k3_dma_chan *c, *cn; + struct k3_dma_dev *d = platform_get_drvdata(op); + + dma_async_device_unregister(&d->slave); + of_dma_controller_free((&op->dev)->of_node); + + list_for_each_entry_safe(c, cn, &d->slave.channels, vc.chan.device_node) { + list_del(&c->vc.chan.device_node); + tasklet_kill(&c->vc.task); + } + tasklet_kill(&d->task); + clk_disable_unprepare(d->clk); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int k3_dma_suspend_dev(struct device *dev) +{ + struct k3_dma_dev *d = dev_get_drvdata(dev); + u32 stat = 0; + + stat = k3_dma_get_chan_stat(d); + if (stat) { + dev_warn(d->slave.dev, + "chan %d is running fail to suspend\n", stat); + return -1; + } + k3_dma_enable_dma(d, false); + clk_disable_unprepare(d->clk); + return 0; +} + +static int k3_dma_resume_dev(struct device *dev) +{ + struct k3_dma_dev *d = dev_get_drvdata(dev); + int ret = 0; + + ret = clk_prepare_enable(d->clk); + if (ret < 0) { + dev_err(d->slave.dev, "clk_prepare_enable failed: %d\n", ret); + return ret; + } + k3_dma_enable_dma(d, true); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend_dev, k3_dma_resume_dev); + +static struct platform_driver k3_pdma_driver = { + .driver = { + .name = DRIVER_NAME, + .pm = &k3_dma_pmops, + .of_match_table = k3_pdma_dt_ids, + }, + .probe = k3_dma_probe, + .remove = k3_dma_remove, +}; + +module_platform_driver(k3_pdma_driver); + +MODULE_DESCRIPTION("Hisilicon k3 DMA Driver"); +MODULE_ALIAS("platform:k3dma"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/mic_x100_dma.c b/drivers/dma/mic_x100_dma.c new file mode 100644 index 000000000..6de2e677b --- /dev/null +++ b/drivers/dma/mic_x100_dma.c @@ -0,0 +1,774 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2014 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC X100 DMA Driver. + * + * Adapted from IOAT dma driver. + */ +#include <linux/module.h> +#include <linux/io.h> +#include <linux/seq_file.h> + +#include "mic_x100_dma.h" + +#define MIC_DMA_MAX_XFER_SIZE_CARD (1 * 1024 * 1024 -\ + MIC_DMA_ALIGN_BYTES) +#define MIC_DMA_MAX_XFER_SIZE_HOST (1 * 1024 * 1024 >> 1) +#define MIC_DMA_DESC_TYPE_SHIFT 60 +#define MIC_DMA_MEMCPY_LEN_SHIFT 46 +#define MIC_DMA_STAT_INTR_SHIFT 59 + +/* high-water mark for pushing dma descriptors */ +static int mic_dma_pending_level = 4; + +/* Status descriptor is used to write a 64 bit value to a memory location */ +enum mic_dma_desc_format_type { + MIC_DMA_MEMCPY = 1, + MIC_DMA_STATUS, +}; + +static inline u32 mic_dma_hw_ring_inc(u32 val) +{ + return (val + 1) % MIC_DMA_DESC_RX_SIZE; +} + +static inline u32 mic_dma_hw_ring_dec(u32 val) +{ + return val ? val - 1 : MIC_DMA_DESC_RX_SIZE - 1; +} + +static inline void mic_dma_hw_ring_inc_head(struct mic_dma_chan *ch) +{ + ch->head = mic_dma_hw_ring_inc(ch->head); +} + +/* Prepare a memcpy desc */ +static inline void mic_dma_memcpy_desc(struct mic_dma_desc *desc, + dma_addr_t src_phys, dma_addr_t dst_phys, u64 size) +{ + u64 qw0, qw1; + + qw0 = src_phys; + qw0 |= (size >> MIC_DMA_ALIGN_SHIFT) << MIC_DMA_MEMCPY_LEN_SHIFT; + qw1 = MIC_DMA_MEMCPY; + qw1 <<= MIC_DMA_DESC_TYPE_SHIFT; + qw1 |= dst_phys; + desc->qw0 = qw0; + desc->qw1 = qw1; +} + +/* Prepare a status desc. with @data to be written at @dst_phys */ +static inline void mic_dma_prep_status_desc(struct mic_dma_desc *desc, u64 data, + dma_addr_t dst_phys, bool generate_intr) +{ + u64 qw0, qw1; + + qw0 = data; + qw1 = (u64) MIC_DMA_STATUS << MIC_DMA_DESC_TYPE_SHIFT | dst_phys; + if (generate_intr) + qw1 |= (1ULL << MIC_DMA_STAT_INTR_SHIFT); + desc->qw0 = qw0; + desc->qw1 = qw1; +} + +static void mic_dma_cleanup(struct mic_dma_chan *ch) +{ + struct dma_async_tx_descriptor *tx; + u32 tail; + u32 last_tail; + + spin_lock(&ch->cleanup_lock); + tail = mic_dma_read_cmp_cnt(ch); + /* + * This is the barrier pair for smp_wmb() in fn. + * mic_dma_tx_submit_unlock. It's required so that we read the + * updated cookie value from tx->cookie. + */ + smp_rmb(); + for (last_tail = ch->last_tail; tail != last_tail;) { + tx = &ch->tx_array[last_tail]; + if (tx->cookie) { + dma_cookie_complete(tx); + if (tx->callback) { + tx->callback(tx->callback_param); + tx->callback = NULL; + } + } + last_tail = mic_dma_hw_ring_inc(last_tail); + } + /* finish all completion callbacks before incrementing tail */ + smp_mb(); + ch->last_tail = last_tail; + spin_unlock(&ch->cleanup_lock); +} + +static u32 mic_dma_ring_count(u32 head, u32 tail) +{ + u32 count; + + if (head >= tail) + count = (tail - 0) + (MIC_DMA_DESC_RX_SIZE - head); + else + count = tail - head; + return count - 1; +} + +/* Returns the num. of free descriptors on success, -ENOMEM on failure */ +static int mic_dma_avail_desc_ring_space(struct mic_dma_chan *ch, int required) +{ + struct device *dev = mic_dma_ch_to_device(ch); + u32 count; + + count = mic_dma_ring_count(ch->head, ch->last_tail); + if (count < required) { + mic_dma_cleanup(ch); + count = mic_dma_ring_count(ch->head, ch->last_tail); + } + + if (count < required) { + dev_dbg(dev, "Not enough desc space"); + dev_dbg(dev, "%s %d required=%u, avail=%u\n", + __func__, __LINE__, required, count); + return -ENOMEM; + } else { + return count; + } +} + +/* Program memcpy descriptors into the descriptor ring and update s/w head ptr*/ +static int mic_dma_prog_memcpy_desc(struct mic_dma_chan *ch, dma_addr_t src, + dma_addr_t dst, size_t len) +{ + size_t current_transfer_len; + size_t max_xfer_size = to_mic_dma_dev(ch)->max_xfer_size; + /* 3 is added to make sure we have enough space for status desc */ + int num_desc = len / max_xfer_size + 3; + int ret; + + if (len % max_xfer_size) + num_desc++; + + ret = mic_dma_avail_desc_ring_space(ch, num_desc); + if (ret < 0) + return ret; + do { + current_transfer_len = min(len, max_xfer_size); + mic_dma_memcpy_desc(&ch->desc_ring[ch->head], + src, dst, current_transfer_len); + mic_dma_hw_ring_inc_head(ch); + len -= current_transfer_len; + dst = dst + current_transfer_len; + src = src + current_transfer_len; + } while (len > 0); + return 0; +} + +/* It's a h/w quirk and h/w needs 2 status descriptors for every status desc */ +static void mic_dma_prog_intr(struct mic_dma_chan *ch) +{ + mic_dma_prep_status_desc(&ch->desc_ring[ch->head], 0, + ch->status_dest_micpa, false); + mic_dma_hw_ring_inc_head(ch); + mic_dma_prep_status_desc(&ch->desc_ring[ch->head], 0, + ch->status_dest_micpa, true); + mic_dma_hw_ring_inc_head(ch); +} + +/* Wrapper function to program memcpy descriptors/status descriptors */ +static int mic_dma_do_dma(struct mic_dma_chan *ch, int flags, dma_addr_t src, + dma_addr_t dst, size_t len) +{ + if (-ENOMEM == mic_dma_prog_memcpy_desc(ch, src, dst, len)) + return -ENOMEM; + /* Above mic_dma_prog_memcpy_desc() makes sure we have enough space */ + if (flags & DMA_PREP_FENCE) { + mic_dma_prep_status_desc(&ch->desc_ring[ch->head], 0, + ch->status_dest_micpa, false); + mic_dma_hw_ring_inc_head(ch); + } + + if (flags & DMA_PREP_INTERRUPT) + mic_dma_prog_intr(ch); + + return 0; +} + +static inline void mic_dma_issue_pending(struct dma_chan *ch) +{ + struct mic_dma_chan *mic_ch = to_mic_dma_chan(ch); + + spin_lock(&mic_ch->issue_lock); + /* + * Write to head triggers h/w to act on the descriptors. + * On MIC, writing the same head value twice causes + * a h/w error. On second write, h/w assumes we filled + * the entire ring & overwrote some of the descriptors. + */ + if (mic_ch->issued == mic_ch->submitted) + goto out; + mic_ch->issued = mic_ch->submitted; + /* + * make descriptor updates visible before advancing head, + * this is purposefully not smp_wmb() since we are also + * publishing the descriptor updates to a dma device + */ + wmb(); + mic_dma_write_reg(mic_ch, MIC_DMA_REG_DHPR, mic_ch->issued); +out: + spin_unlock(&mic_ch->issue_lock); +} + +static inline void mic_dma_update_pending(struct mic_dma_chan *ch) +{ + if (mic_dma_ring_count(ch->issued, ch->submitted) + > mic_dma_pending_level) + mic_dma_issue_pending(&ch->api_ch); +} + +static dma_cookie_t mic_dma_tx_submit_unlock(struct dma_async_tx_descriptor *tx) +{ + struct mic_dma_chan *mic_ch = to_mic_dma_chan(tx->chan); + dma_cookie_t cookie; + + dma_cookie_assign(tx); + cookie = tx->cookie; + /* + * We need an smp write barrier here because another CPU might see + * an update to submitted and update h/w head even before we + * assigned a cookie to this tx. + */ + smp_wmb(); + mic_ch->submitted = mic_ch->head; + spin_unlock(&mic_ch->prep_lock); + mic_dma_update_pending(mic_ch); + return cookie; +} + +static inline struct dma_async_tx_descriptor * +allocate_tx(struct mic_dma_chan *ch) +{ + u32 idx = mic_dma_hw_ring_dec(ch->head); + struct dma_async_tx_descriptor *tx = &ch->tx_array[idx]; + + dma_async_tx_descriptor_init(tx, &ch->api_ch); + tx->tx_submit = mic_dma_tx_submit_unlock; + return tx; +} + +/* + * Prepare a memcpy descriptor to be added to the ring. + * Note that the temporary descriptor adds an extra overhead of copying the + * descriptor to ring. So, we copy directly to the descriptor ring + */ +static struct dma_async_tx_descriptor * +mic_dma_prep_memcpy_lock(struct dma_chan *ch, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct mic_dma_chan *mic_ch = to_mic_dma_chan(ch); + struct device *dev = mic_dma_ch_to_device(mic_ch); + int result; + + if (!len && !flags) + return NULL; + + spin_lock(&mic_ch->prep_lock); + result = mic_dma_do_dma(mic_ch, flags, dma_src, dma_dest, len); + if (result >= 0) + return allocate_tx(mic_ch); + dev_err(dev, "Error enqueueing dma, error=%d\n", result); + spin_unlock(&mic_ch->prep_lock); + return NULL; +} + +static struct dma_async_tx_descriptor * +mic_dma_prep_interrupt_lock(struct dma_chan *ch, unsigned long flags) +{ + struct mic_dma_chan *mic_ch = to_mic_dma_chan(ch); + int ret; + + spin_lock(&mic_ch->prep_lock); + ret = mic_dma_do_dma(mic_ch, flags, 0, 0, 0); + if (!ret) + return allocate_tx(mic_ch); + spin_unlock(&mic_ch->prep_lock); + return NULL; +} + +/* Return the status of the transaction */ +static enum dma_status +mic_dma_tx_status(struct dma_chan *ch, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct mic_dma_chan *mic_ch = to_mic_dma_chan(ch); + + if (DMA_COMPLETE != dma_cookie_status(ch, cookie, txstate)) + mic_dma_cleanup(mic_ch); + + return dma_cookie_status(ch, cookie, txstate); +} + +static irqreturn_t mic_dma_thread_fn(int irq, void *data) +{ + mic_dma_cleanup((struct mic_dma_chan *)data); + return IRQ_HANDLED; +} + +static irqreturn_t mic_dma_intr_handler(int irq, void *data) +{ + struct mic_dma_chan *ch = ((struct mic_dma_chan *)data); + + mic_dma_ack_interrupt(ch); + return IRQ_WAKE_THREAD; +} + +static int mic_dma_alloc_desc_ring(struct mic_dma_chan *ch) +{ + u64 desc_ring_size = MIC_DMA_DESC_RX_SIZE * sizeof(*ch->desc_ring); + struct device *dev = &to_mbus_device(ch)->dev; + + desc_ring_size = ALIGN(desc_ring_size, MIC_DMA_ALIGN_BYTES); + ch->desc_ring = kzalloc(desc_ring_size, GFP_KERNEL); + + if (!ch->desc_ring) + return -ENOMEM; + + ch->desc_ring_micpa = dma_map_single(dev, ch->desc_ring, + desc_ring_size, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, ch->desc_ring_micpa)) + goto map_error; + + ch->tx_array = vzalloc(MIC_DMA_DESC_RX_SIZE * sizeof(*ch->tx_array)); + if (!ch->tx_array) + goto tx_error; + return 0; +tx_error: + dma_unmap_single(dev, ch->desc_ring_micpa, desc_ring_size, + DMA_BIDIRECTIONAL); +map_error: + kfree(ch->desc_ring); + return -ENOMEM; +} + +static void mic_dma_free_desc_ring(struct mic_dma_chan *ch) +{ + u64 desc_ring_size = MIC_DMA_DESC_RX_SIZE * sizeof(*ch->desc_ring); + + vfree(ch->tx_array); + desc_ring_size = ALIGN(desc_ring_size, MIC_DMA_ALIGN_BYTES); + dma_unmap_single(&to_mbus_device(ch)->dev, ch->desc_ring_micpa, + desc_ring_size, DMA_BIDIRECTIONAL); + kfree(ch->desc_ring); + ch->desc_ring = NULL; +} + +static void mic_dma_free_status_dest(struct mic_dma_chan *ch) +{ + dma_unmap_single(&to_mbus_device(ch)->dev, ch->status_dest_micpa, + L1_CACHE_BYTES, DMA_BIDIRECTIONAL); + kfree(ch->status_dest); +} + +static int mic_dma_alloc_status_dest(struct mic_dma_chan *ch) +{ + struct device *dev = &to_mbus_device(ch)->dev; + + ch->status_dest = kzalloc(L1_CACHE_BYTES, GFP_KERNEL); + if (!ch->status_dest) + return -ENOMEM; + ch->status_dest_micpa = dma_map_single(dev, ch->status_dest, + L1_CACHE_BYTES, DMA_BIDIRECTIONAL); + if (dma_mapping_error(dev, ch->status_dest_micpa)) { + kfree(ch->status_dest); + ch->status_dest = NULL; + return -ENOMEM; + } + return 0; +} + +static int mic_dma_check_chan(struct mic_dma_chan *ch) +{ + if (mic_dma_read_reg(ch, MIC_DMA_REG_DCHERR) || + mic_dma_read_reg(ch, MIC_DMA_REG_DSTAT) & MIC_DMA_CHAN_QUIESCE) { + mic_dma_disable_chan(ch); + mic_dma_chan_mask_intr(ch); + dev_err(mic_dma_ch_to_device(ch), + "%s %d error setting up mic dma chan %d\n", + __func__, __LINE__, ch->ch_num); + return -EBUSY; + } + return 0; +} + +static int mic_dma_chan_setup(struct mic_dma_chan *ch) +{ + if (MIC_DMA_CHAN_MIC == ch->owner) + mic_dma_chan_set_owner(ch); + mic_dma_disable_chan(ch); + mic_dma_chan_mask_intr(ch); + mic_dma_write_reg(ch, MIC_DMA_REG_DCHERRMSK, 0); + mic_dma_chan_set_desc_ring(ch); + ch->last_tail = mic_dma_read_reg(ch, MIC_DMA_REG_DTPR); + ch->head = ch->last_tail; + ch->issued = 0; + mic_dma_chan_unmask_intr(ch); + mic_dma_enable_chan(ch); + return mic_dma_check_chan(ch); +} + +static void mic_dma_chan_destroy(struct mic_dma_chan *ch) +{ + mic_dma_disable_chan(ch); + mic_dma_chan_mask_intr(ch); +} + +static void mic_dma_unregister_dma_device(struct mic_dma_device *mic_dma_dev) +{ + dma_async_device_unregister(&mic_dma_dev->dma_dev); +} + +static int mic_dma_setup_irq(struct mic_dma_chan *ch) +{ + ch->cookie = + to_mbus_hw_ops(ch)->request_threaded_irq(to_mbus_device(ch), + mic_dma_intr_handler, mic_dma_thread_fn, + "mic dma_channel", ch, ch->ch_num); + if (IS_ERR(ch->cookie)) + return IS_ERR(ch->cookie); + return 0; +} + +static inline void mic_dma_free_irq(struct mic_dma_chan *ch) +{ + to_mbus_hw_ops(ch)->free_irq(to_mbus_device(ch), ch->cookie, ch); +} + +static int mic_dma_chan_init(struct mic_dma_chan *ch) +{ + int ret = mic_dma_alloc_desc_ring(ch); + + if (ret) + goto ring_error; + ret = mic_dma_alloc_status_dest(ch); + if (ret) + goto status_error; + ret = mic_dma_chan_setup(ch); + if (ret) + goto chan_error; + return ret; +chan_error: + mic_dma_free_status_dest(ch); +status_error: + mic_dma_free_desc_ring(ch); +ring_error: + return ret; +} + +static int mic_dma_drain_chan(struct mic_dma_chan *ch) +{ + struct dma_async_tx_descriptor *tx; + int err = 0; + dma_cookie_t cookie; + + tx = mic_dma_prep_memcpy_lock(&ch->api_ch, 0, 0, 0, DMA_PREP_FENCE); + if (!tx) { + err = -ENOMEM; + goto error; + } + + cookie = tx->tx_submit(tx); + if (dma_submit_error(cookie)) + err = -ENOMEM; + else + err = dma_sync_wait(&ch->api_ch, cookie); + if (err) { + dev_err(mic_dma_ch_to_device(ch), "%s %d TO chan 0x%x\n", + __func__, __LINE__, ch->ch_num); + err = -EIO; + } +error: + mic_dma_cleanup(ch); + return err; +} + +static inline void mic_dma_chan_uninit(struct mic_dma_chan *ch) +{ + mic_dma_chan_destroy(ch); + mic_dma_cleanup(ch); + mic_dma_free_status_dest(ch); + mic_dma_free_desc_ring(ch); +} + +static int mic_dma_init(struct mic_dma_device *mic_dma_dev, + enum mic_dma_chan_owner owner) +{ + int i, first_chan = mic_dma_dev->start_ch; + struct mic_dma_chan *ch; + int ret; + + for (i = first_chan; i < first_chan + MIC_DMA_NUM_CHAN; i++) { + unsigned long data; + ch = &mic_dma_dev->mic_ch[i]; + data = (unsigned long)ch; + ch->ch_num = i; + ch->owner = owner; + spin_lock_init(&ch->cleanup_lock); + spin_lock_init(&ch->prep_lock); + spin_lock_init(&ch->issue_lock); + ret = mic_dma_setup_irq(ch); + if (ret) + goto error; + } + return 0; +error: + for (i = i - 1; i >= first_chan; i--) + mic_dma_free_irq(ch); + return ret; +} + +static void mic_dma_uninit(struct mic_dma_device *mic_dma_dev) +{ + int i, first_chan = mic_dma_dev->start_ch; + struct mic_dma_chan *ch; + + for (i = first_chan; i < first_chan + MIC_DMA_NUM_CHAN; i++) { + ch = &mic_dma_dev->mic_ch[i]; + mic_dma_free_irq(ch); + } +} + +static int mic_dma_alloc_chan_resources(struct dma_chan *ch) +{ + int ret = mic_dma_chan_init(to_mic_dma_chan(ch)); + if (ret) + return ret; + return MIC_DMA_DESC_RX_SIZE; +} + +static void mic_dma_free_chan_resources(struct dma_chan *ch) +{ + struct mic_dma_chan *mic_ch = to_mic_dma_chan(ch); + mic_dma_drain_chan(mic_ch); + mic_dma_chan_uninit(mic_ch); +} + +/* Set the fn. handlers and register the dma device with dma api */ +static int mic_dma_register_dma_device(struct mic_dma_device *mic_dma_dev, + enum mic_dma_chan_owner owner) +{ + int i, first_chan = mic_dma_dev->start_ch; + + dma_cap_zero(mic_dma_dev->dma_dev.cap_mask); + /* + * This dma engine is not capable of host memory to host memory + * transfers + */ + dma_cap_set(DMA_MEMCPY, mic_dma_dev->dma_dev.cap_mask); + + if (MIC_DMA_CHAN_HOST == owner) + dma_cap_set(DMA_PRIVATE, mic_dma_dev->dma_dev.cap_mask); + mic_dma_dev->dma_dev.device_alloc_chan_resources = + mic_dma_alloc_chan_resources; + mic_dma_dev->dma_dev.device_free_chan_resources = + mic_dma_free_chan_resources; + mic_dma_dev->dma_dev.device_tx_status = mic_dma_tx_status; + mic_dma_dev->dma_dev.device_prep_dma_memcpy = mic_dma_prep_memcpy_lock; + mic_dma_dev->dma_dev.device_prep_dma_interrupt = + mic_dma_prep_interrupt_lock; + mic_dma_dev->dma_dev.device_issue_pending = mic_dma_issue_pending; + mic_dma_dev->dma_dev.copy_align = MIC_DMA_ALIGN_SHIFT; + INIT_LIST_HEAD(&mic_dma_dev->dma_dev.channels); + for (i = first_chan; i < first_chan + MIC_DMA_NUM_CHAN; i++) { + mic_dma_dev->mic_ch[i].api_ch.device = &mic_dma_dev->dma_dev; + dma_cookie_init(&mic_dma_dev->mic_ch[i].api_ch); + list_add_tail(&mic_dma_dev->mic_ch[i].api_ch.device_node, + &mic_dma_dev->dma_dev.channels); + } + return dma_async_device_register(&mic_dma_dev->dma_dev); +} + +/* + * Initializes dma channels and registers the dma device with the + * dma engine api. + */ +static struct mic_dma_device *mic_dma_dev_reg(struct mbus_device *mbdev, + enum mic_dma_chan_owner owner) +{ + struct mic_dma_device *mic_dma_dev; + int ret; + struct device *dev = &mbdev->dev; + + mic_dma_dev = kzalloc(sizeof(*mic_dma_dev), GFP_KERNEL); + if (!mic_dma_dev) { + ret = -ENOMEM; + goto alloc_error; + } + mic_dma_dev->mbdev = mbdev; + mic_dma_dev->dma_dev.dev = dev; + mic_dma_dev->mmio = mbdev->mmio_va; + if (MIC_DMA_CHAN_HOST == owner) { + mic_dma_dev->start_ch = 0; + mic_dma_dev->max_xfer_size = MIC_DMA_MAX_XFER_SIZE_HOST; + } else { + mic_dma_dev->start_ch = 4; + mic_dma_dev->max_xfer_size = MIC_DMA_MAX_XFER_SIZE_CARD; + } + ret = mic_dma_init(mic_dma_dev, owner); + if (ret) + goto init_error; + ret = mic_dma_register_dma_device(mic_dma_dev, owner); + if (ret) + goto reg_error; + return mic_dma_dev; +reg_error: + mic_dma_uninit(mic_dma_dev); +init_error: + kfree(mic_dma_dev); + mic_dma_dev = NULL; +alloc_error: + dev_err(dev, "Error at %s %d ret=%d\n", __func__, __LINE__, ret); + return mic_dma_dev; +} + +static void mic_dma_dev_unreg(struct mic_dma_device *mic_dma_dev) +{ + mic_dma_unregister_dma_device(mic_dma_dev); + mic_dma_uninit(mic_dma_dev); + kfree(mic_dma_dev); +} + +/* DEBUGFS CODE */ +static int mic_dma_reg_seq_show(struct seq_file *s, void *pos) +{ + struct mic_dma_device *mic_dma_dev = s->private; + int i, chan_num, first_chan = mic_dma_dev->start_ch; + struct mic_dma_chan *ch; + + seq_printf(s, "SBOX_DCR: %#x\n", + mic_dma_mmio_read(&mic_dma_dev->mic_ch[first_chan], + MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR)); + seq_puts(s, "DMA Channel Registers\n"); + seq_printf(s, "%-10s| %-10s %-10s %-10s %-10s %-10s", + "Channel", "DCAR", "DTPR", "DHPR", "DRAR_HI", "DRAR_LO"); + seq_printf(s, " %-11s %-14s %-10s\n", "DCHERR", "DCHERRMSK", "DSTAT"); + for (i = first_chan; i < first_chan + MIC_DMA_NUM_CHAN; i++) { + ch = &mic_dma_dev->mic_ch[i]; + chan_num = ch->ch_num; + seq_printf(s, "%-10i| %-#10x %-#10x %-#10x %-#10x", + chan_num, + mic_dma_read_reg(ch, MIC_DMA_REG_DCAR), + mic_dma_read_reg(ch, MIC_DMA_REG_DTPR), + mic_dma_read_reg(ch, MIC_DMA_REG_DHPR), + mic_dma_read_reg(ch, MIC_DMA_REG_DRAR_HI)); + seq_printf(s, " %-#10x %-#10x %-#14x %-#10x\n", + mic_dma_read_reg(ch, MIC_DMA_REG_DRAR_LO), + mic_dma_read_reg(ch, MIC_DMA_REG_DCHERR), + mic_dma_read_reg(ch, MIC_DMA_REG_DCHERRMSK), + mic_dma_read_reg(ch, MIC_DMA_REG_DSTAT)); + } + return 0; +} + +static int mic_dma_reg_debug_open(struct inode *inode, struct file *file) +{ + return single_open(file, mic_dma_reg_seq_show, inode->i_private); +} + +static int mic_dma_reg_debug_release(struct inode *inode, struct file *file) +{ + return single_release(inode, file); +} + +static const struct file_operations mic_dma_reg_ops = { + .owner = THIS_MODULE, + .open = mic_dma_reg_debug_open, + .read = seq_read, + .llseek = seq_lseek, + .release = mic_dma_reg_debug_release +}; + +/* Debugfs parent dir */ +static struct dentry *mic_dma_dbg; + +static int mic_dma_driver_probe(struct mbus_device *mbdev) +{ + struct mic_dma_device *mic_dma_dev; + enum mic_dma_chan_owner owner; + + if (MBUS_DEV_DMA_MIC == mbdev->id.device) + owner = MIC_DMA_CHAN_MIC; + else + owner = MIC_DMA_CHAN_HOST; + + mic_dma_dev = mic_dma_dev_reg(mbdev, owner); + dev_set_drvdata(&mbdev->dev, mic_dma_dev); + + if (mic_dma_dbg) { + mic_dma_dev->dbg_dir = debugfs_create_dir(dev_name(&mbdev->dev), + mic_dma_dbg); + if (mic_dma_dev->dbg_dir) + debugfs_create_file("mic_dma_reg", 0444, + mic_dma_dev->dbg_dir, mic_dma_dev, + &mic_dma_reg_ops); + } + return 0; +} + +static void mic_dma_driver_remove(struct mbus_device *mbdev) +{ + struct mic_dma_device *mic_dma_dev; + + mic_dma_dev = dev_get_drvdata(&mbdev->dev); + debugfs_remove_recursive(mic_dma_dev->dbg_dir); + mic_dma_dev_unreg(mic_dma_dev); +} + +static struct mbus_device_id id_table[] = { + {MBUS_DEV_DMA_MIC, MBUS_DEV_ANY_ID}, + {MBUS_DEV_DMA_HOST, MBUS_DEV_ANY_ID}, + {0}, +}; + +static struct mbus_driver mic_dma_driver = { + .driver.name = KBUILD_MODNAME, + .driver.owner = THIS_MODULE, + .id_table = id_table, + .probe = mic_dma_driver_probe, + .remove = mic_dma_driver_remove, +}; + +static int __init mic_x100_dma_init(void) +{ + int rc = mbus_register_driver(&mic_dma_driver); + if (rc) + return rc; + mic_dma_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL); + return 0; +} + +static void __exit mic_x100_dma_exit(void) +{ + debugfs_remove_recursive(mic_dma_dbg); + mbus_unregister_driver(&mic_dma_driver); +} + +module_init(mic_x100_dma_init); +module_exit(mic_x100_dma_exit); + +MODULE_DEVICE_TABLE(mbus, id_table); +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel(R) MIC X100 DMA Driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/mic_x100_dma.h b/drivers/dma/mic_x100_dma.h new file mode 100644 index 000000000..f663b0bdd --- /dev/null +++ b/drivers/dma/mic_x100_dma.h @@ -0,0 +1,286 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2014 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC X100 DMA Driver. + * + * Adapted from IOAT dma driver. + */ +#ifndef _MIC_X100_DMA_H_ +#define _MIC_X100_DMA_H_ + +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/sched.h> +#include <linux/debugfs.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/mic_bus.h> + +#include "dmaengine.h" + +/* + * MIC has a total of 8 dma channels. + * Four channels are assigned for host SW use & the remaining for MIC SW. + * MIC DMA transfer size & addresses need to be 64 byte aligned. + */ +#define MIC_DMA_MAX_NUM_CHAN 8 +#define MIC_DMA_NUM_CHAN 4 +#define MIC_DMA_ALIGN_SHIFT 6 +#define MIC_DMA_ALIGN_BYTES (1 << MIC_DMA_ALIGN_SHIFT) +#define MIC_DMA_DESC_RX_SIZE (128 * 1024 - 4) + +/* + * Register descriptions + * All the registers are 32 bit registers. + * DCR is a global register and all others are per-channel. + * DCR - bits 0, 2, 4, 6, 8, 10, 12, 14 - enable bits for channels 0 to 7 + * bits 1, 3, 5, 7, 9, 11, 13, 15 - owner bits for channels 0 to 7 + * DCAR - bit 24 & 25 interrupt masks for mic owned & host owned channels + * DHPR - head of the descriptor ring updated by s/w + * DTPR - tail of the descriptor ring updated by h/w + * DRAR_LO - lower 32 bits of descriptor ring's mic address + * DRAR_HI - 3:0 - remaining 4 bits of descriptor ring's mic address + * 20:4 descriptor ring size + * 25:21 mic smpt entry number + * DSTAT - 16:0 h/w completion count; 31:28 dma engine status + * DCHERR - this register is non-zero on error + * DCHERRMSK - interrupt mask register + */ +#define MIC_DMA_HW_CMP_CNT_MASK 0x1ffff +#define MIC_DMA_CHAN_QUIESCE 0x20000000 +#define MIC_DMA_SBOX_BASE 0x00010000 +#define MIC_DMA_SBOX_DCR 0x0000A280 +#define MIC_DMA_SBOX_CH_BASE 0x0001A000 +#define MIC_DMA_SBOX_CHAN_OFF 0x40 +#define MIC_DMA_SBOX_DCAR_IM0 (0x1 << 24) +#define MIC_DMA_SBOX_DCAR_IM1 (0x1 << 25) +#define MIC_DMA_SBOX_DRARHI_SYS_MASK (0x1 << 26) +#define MIC_DMA_REG_DCAR 0 +#define MIC_DMA_REG_DHPR 4 +#define MIC_DMA_REG_DTPR 8 +#define MIC_DMA_REG_DRAR_LO 20 +#define MIC_DMA_REG_DRAR_HI 24 +#define MIC_DMA_REG_DSTAT 32 +#define MIC_DMA_REG_DCHERR 44 +#define MIC_DMA_REG_DCHERRMSK 48 + +/* HW dma desc */ +struct mic_dma_desc { + u64 qw0; + u64 qw1; +}; + +enum mic_dma_chan_owner { + MIC_DMA_CHAN_MIC = 0, + MIC_DMA_CHAN_HOST +}; + +/* + * mic_dma_chan - channel specific information + * @ch_num: channel number + * @owner: owner of this channel + * @last_tail: cached value of descriptor ring tail + * @head: index of next descriptor in desc_ring + * @issued: hardware notification point + * @submitted: index that will be used to submit descriptors to h/w + * @api_ch: dma engine api channel + * @desc_ring: dma descriptor ring + * @desc_ring_micpa: mic physical address of desc_ring + * @status_dest: destination for status (fence) descriptor + * @status_dest_micpa: mic address for status_dest, + * DMA controller uses this address + * @tx_array: array of async_tx + * @cleanup_lock: lock held when processing completed tx + * @prep_lock: lock held in prep_memcpy & released in tx_submit + * @issue_lock: lock used to synchronize writes to head + * @cookie: mic_irq cookie used with mic irq request + */ +struct mic_dma_chan { + int ch_num; + enum mic_dma_chan_owner owner; + u32 last_tail; + u32 head; + u32 issued; + u32 submitted; + struct dma_chan api_ch; + struct mic_dma_desc *desc_ring; + dma_addr_t desc_ring_micpa; + u64 *status_dest; + dma_addr_t status_dest_micpa; + struct dma_async_tx_descriptor *tx_array; + spinlock_t cleanup_lock; + spinlock_t prep_lock; + spinlock_t issue_lock; + struct mic_irq *cookie; +}; + +/* + * struct mic_dma_device - per mic device + * @mic_ch: dma channels + * @dma_dev: underlying dma device + * @mbdev: mic bus dma device + * @mmio: virtual address of the mmio space + * @dbg_dir: debugfs directory + * @start_ch: first channel number that can be used + * @max_xfer_size: maximum transfer size per dma descriptor + */ +struct mic_dma_device { + struct mic_dma_chan mic_ch[MIC_DMA_MAX_NUM_CHAN]; + struct dma_device dma_dev; + struct mbus_device *mbdev; + void __iomem *mmio; + struct dentry *dbg_dir; + int start_ch; + size_t max_xfer_size; +}; + +static inline struct mic_dma_chan *to_mic_dma_chan(struct dma_chan *ch) +{ + return container_of(ch, struct mic_dma_chan, api_ch); +} + +static inline struct mic_dma_device *to_mic_dma_dev(struct mic_dma_chan *ch) +{ + return + container_of((const typeof(((struct mic_dma_device *)0)->mic_ch)*) + (ch - ch->ch_num), struct mic_dma_device, mic_ch); +} + +static inline struct mbus_device *to_mbus_device(struct mic_dma_chan *ch) +{ + return to_mic_dma_dev(ch)->mbdev; +} + +static inline struct mbus_hw_ops *to_mbus_hw_ops(struct mic_dma_chan *ch) +{ + return to_mbus_device(ch)->hw_ops; +} + +static inline struct device *mic_dma_ch_to_device(struct mic_dma_chan *ch) +{ + return to_mic_dma_dev(ch)->dma_dev.dev; +} + +static inline void __iomem *mic_dma_chan_to_mmio(struct mic_dma_chan *ch) +{ + return to_mic_dma_dev(ch)->mmio; +} + +static inline u32 mic_dma_read_reg(struct mic_dma_chan *ch, u32 reg) +{ + return ioread32(mic_dma_chan_to_mmio(ch) + MIC_DMA_SBOX_CH_BASE + + ch->ch_num * MIC_DMA_SBOX_CHAN_OFF + reg); +} + +static inline void mic_dma_write_reg(struct mic_dma_chan *ch, u32 reg, u32 val) +{ + iowrite32(val, mic_dma_chan_to_mmio(ch) + MIC_DMA_SBOX_CH_BASE + + ch->ch_num * MIC_DMA_SBOX_CHAN_OFF + reg); +} + +static inline u32 mic_dma_mmio_read(struct mic_dma_chan *ch, u32 offset) +{ + return ioread32(mic_dma_chan_to_mmio(ch) + offset); +} + +static inline void mic_dma_mmio_write(struct mic_dma_chan *ch, u32 val, + u32 offset) +{ + iowrite32(val, mic_dma_chan_to_mmio(ch) + offset); +} + +static inline u32 mic_dma_read_cmp_cnt(struct mic_dma_chan *ch) +{ + return mic_dma_read_reg(ch, MIC_DMA_REG_DSTAT) & + MIC_DMA_HW_CMP_CNT_MASK; +} + +static inline void mic_dma_chan_set_owner(struct mic_dma_chan *ch) +{ + u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR); + u32 chan_num = ch->ch_num; + + dcr = (dcr & ~(0x1 << (chan_num * 2))) | (ch->owner << (chan_num * 2)); + mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR); +} + +static inline void mic_dma_enable_chan(struct mic_dma_chan *ch) +{ + u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR); + + dcr |= 2 << (ch->ch_num << 1); + mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR); +} + +static inline void mic_dma_disable_chan(struct mic_dma_chan *ch) +{ + u32 dcr = mic_dma_mmio_read(ch, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR); + + dcr &= ~(2 << (ch->ch_num << 1)); + mic_dma_mmio_write(ch, dcr, MIC_DMA_SBOX_BASE + MIC_DMA_SBOX_DCR); +} + +static void mic_dma_chan_set_desc_ring(struct mic_dma_chan *ch) +{ + u32 drar_hi; + dma_addr_t desc_ring_micpa = ch->desc_ring_micpa; + + drar_hi = (MIC_DMA_DESC_RX_SIZE & 0x1ffff) << 4; + if (MIC_DMA_CHAN_MIC == ch->owner) { + drar_hi |= (desc_ring_micpa >> 32) & 0xf; + } else { + drar_hi |= MIC_DMA_SBOX_DRARHI_SYS_MASK; + drar_hi |= ((desc_ring_micpa >> 34) + & 0x1f) << 21; + drar_hi |= (desc_ring_micpa >> 32) & 0x3; + } + mic_dma_write_reg(ch, MIC_DMA_REG_DRAR_LO, (u32) desc_ring_micpa); + mic_dma_write_reg(ch, MIC_DMA_REG_DRAR_HI, drar_hi); +} + +static inline void mic_dma_chan_mask_intr(struct mic_dma_chan *ch) +{ + u32 dcar = mic_dma_read_reg(ch, MIC_DMA_REG_DCAR); + + if (MIC_DMA_CHAN_MIC == ch->owner) + dcar |= MIC_DMA_SBOX_DCAR_IM0; + else + dcar |= MIC_DMA_SBOX_DCAR_IM1; + mic_dma_write_reg(ch, MIC_DMA_REG_DCAR, dcar); +} + +static inline void mic_dma_chan_unmask_intr(struct mic_dma_chan *ch) +{ + u32 dcar = mic_dma_read_reg(ch, MIC_DMA_REG_DCAR); + + if (MIC_DMA_CHAN_MIC == ch->owner) + dcar &= ~MIC_DMA_SBOX_DCAR_IM0; + else + dcar &= ~MIC_DMA_SBOX_DCAR_IM1; + mic_dma_write_reg(ch, MIC_DMA_REG_DCAR, dcar); +} + +static void mic_dma_ack_interrupt(struct mic_dma_chan *ch) +{ + if (MIC_DMA_CHAN_MIC == ch->owner) { + /* HW errata */ + mic_dma_chan_mask_intr(ch); + mic_dma_chan_unmask_intr(ch); + } + to_mbus_hw_ops(ch)->ack_interrupt(to_mbus_device(ch), ch->ch_num); +} +#endif diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c new file mode 100644 index 000000000..462a0229a --- /dev/null +++ b/drivers/dma/mmp_pdma.c @@ -0,0 +1,1138 @@ +/* + * Copyright 2012 Marvell International Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/device.h> +#include <linux/platform_data/mmp_dma.h> +#include <linux/dmapool.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/of.h> +#include <linux/dma/mmp-pdma.h> + +#include "dmaengine.h" + +#define DCSR 0x0000 +#define DALGN 0x00a0 +#define DINT 0x00f0 +#define DDADR 0x0200 +#define DSADR(n) (0x0204 + ((n) << 4)) +#define DTADR(n) (0x0208 + ((n) << 4)) +#define DCMD 0x020c + +#define DCSR_RUN BIT(31) /* Run Bit (read / write) */ +#define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */ +#define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */ +#define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */ +#define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */ +#define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */ +#define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */ +#define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */ + +#define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */ +#define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */ +#define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */ +#define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */ +#define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */ +#define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */ +#define DCSR_EORINTR BIT(9) /* The end of Receive */ + +#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2)) +#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */ +#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */ + +#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */ +#define DDADR_STOP BIT(0) /* Stop (read / write) */ + +#define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */ +#define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */ +#define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */ +#define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */ +#define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */ +#define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */ +#define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */ +#define DCMD_BURST8 (1 << 16) /* 8 byte burst */ +#define DCMD_BURST16 (2 << 16) /* 16 byte burst */ +#define DCMD_BURST32 (3 << 16) /* 32 byte burst */ +#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */ +#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */ +#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */ +#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */ + +#define PDMA_ALIGNMENT 3 +#define PDMA_MAX_DESC_BYTES DCMD_LENGTH + +struct mmp_pdma_desc_hw { + u32 ddadr; /* Points to the next descriptor + flags */ + u32 dsadr; /* DSADR value for the current transfer */ + u32 dtadr; /* DTADR value for the current transfer */ + u32 dcmd; /* DCMD value for the current transfer */ +} __aligned(32); + +struct mmp_pdma_desc_sw { + struct mmp_pdma_desc_hw desc; + struct list_head node; + struct list_head tx_list; + struct dma_async_tx_descriptor async_tx; +}; + +struct mmp_pdma_phy; + +struct mmp_pdma_chan { + struct device *dev; + struct dma_chan chan; + struct dma_async_tx_descriptor desc; + struct mmp_pdma_phy *phy; + enum dma_transfer_direction dir; + + struct mmp_pdma_desc_sw *cyclic_first; /* first desc_sw if channel + * is in cyclic mode */ + + /* channel's basic info */ + struct tasklet_struct tasklet; + u32 dcmd; + u32 drcmr; + u32 dev_addr; + + /* list for desc */ + spinlock_t desc_lock; /* Descriptor list lock */ + struct list_head chain_pending; /* Link descriptors queue for pending */ + struct list_head chain_running; /* Link descriptors queue for running */ + bool idle; /* channel statue machine */ + bool byte_align; + + struct dma_pool *desc_pool; /* Descriptors pool */ +}; + +struct mmp_pdma_phy { + int idx; + void __iomem *base; + struct mmp_pdma_chan *vchan; +}; + +struct mmp_pdma_device { + int dma_channels; + void __iomem *base; + struct device *dev; + struct dma_device device; + struct mmp_pdma_phy *phy; + spinlock_t phy_lock; /* protect alloc/free phy channels */ +}; + +#define tx_to_mmp_pdma_desc(tx) \ + container_of(tx, struct mmp_pdma_desc_sw, async_tx) +#define to_mmp_pdma_desc(lh) \ + container_of(lh, struct mmp_pdma_desc_sw, node) +#define to_mmp_pdma_chan(dchan) \ + container_of(dchan, struct mmp_pdma_chan, chan) +#define to_mmp_pdma_dev(dmadev) \ + container_of(dmadev, struct mmp_pdma_device, device) + +static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr) +{ + u32 reg = (phy->idx << 4) + DDADR; + + writel(addr, phy->base + reg); +} + +static void enable_chan(struct mmp_pdma_phy *phy) +{ + u32 reg, dalgn; + + if (!phy->vchan) + return; + + reg = DRCMR(phy->vchan->drcmr); + writel(DRCMR_MAPVLD | phy->idx, phy->base + reg); + + dalgn = readl(phy->base + DALGN); + if (phy->vchan->byte_align) + dalgn |= 1 << phy->idx; + else + dalgn &= ~(1 << phy->idx); + writel(dalgn, phy->base + DALGN); + + reg = (phy->idx << 2) + DCSR; + writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg); +} + +static void disable_chan(struct mmp_pdma_phy *phy) +{ + u32 reg; + + if (!phy) + return; + + reg = (phy->idx << 2) + DCSR; + writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg); +} + +static int clear_chan_irq(struct mmp_pdma_phy *phy) +{ + u32 dcsr; + u32 dint = readl(phy->base + DINT); + u32 reg = (phy->idx << 2) + DCSR; + + if (!(dint & BIT(phy->idx))) + return -EAGAIN; + + /* clear irq */ + dcsr = readl(phy->base + reg); + writel(dcsr, phy->base + reg); + if ((dcsr & DCSR_BUSERR) && (phy->vchan)) + dev_warn(phy->vchan->dev, "DCSR_BUSERR\n"); + + return 0; +} + +static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id) +{ + struct mmp_pdma_phy *phy = dev_id; + + if (clear_chan_irq(phy) != 0) + return IRQ_NONE; + + tasklet_schedule(&phy->vchan->tasklet); + return IRQ_HANDLED; +} + +static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id) +{ + struct mmp_pdma_device *pdev = dev_id; + struct mmp_pdma_phy *phy; + u32 dint = readl(pdev->base + DINT); + int i, ret; + int irq_num = 0; + + while (dint) { + i = __ffs(dint); + /* only handle interrupts belonging to pdma driver*/ + if (i >= pdev->dma_channels) + break; + dint &= (dint - 1); + phy = &pdev->phy[i]; + ret = mmp_pdma_chan_handler(irq, phy); + if (ret == IRQ_HANDLED) + irq_num++; + } + + if (irq_num) + return IRQ_HANDLED; + + return IRQ_NONE; +} + +/* lookup free phy channel as descending priority */ +static struct mmp_pdma_phy *lookup_phy(struct mmp_pdma_chan *pchan) +{ + int prio, i; + struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device); + struct mmp_pdma_phy *phy, *found = NULL; + unsigned long flags; + + /* + * dma channel priorities + * ch 0 - 3, 16 - 19 <--> (0) + * ch 4 - 7, 20 - 23 <--> (1) + * ch 8 - 11, 24 - 27 <--> (2) + * ch 12 - 15, 28 - 31 <--> (3) + */ + + spin_lock_irqsave(&pdev->phy_lock, flags); + for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) { + for (i = 0; i < pdev->dma_channels; i++) { + if (prio != (i & 0xf) >> 2) + continue; + phy = &pdev->phy[i]; + if (!phy->vchan) { + phy->vchan = pchan; + found = phy; + goto out_unlock; + } + } + } + +out_unlock: + spin_unlock_irqrestore(&pdev->phy_lock, flags); + return found; +} + +static void mmp_pdma_free_phy(struct mmp_pdma_chan *pchan) +{ + struct mmp_pdma_device *pdev = to_mmp_pdma_dev(pchan->chan.device); + unsigned long flags; + u32 reg; + + if (!pchan->phy) + return; + + /* clear the channel mapping in DRCMR */ + reg = DRCMR(pchan->drcmr); + writel(0, pchan->phy->base + reg); + + spin_lock_irqsave(&pdev->phy_lock, flags); + pchan->phy->vchan = NULL; + pchan->phy = NULL; + spin_unlock_irqrestore(&pdev->phy_lock, flags); +} + +/** + * start_pending_queue - transfer any pending transactions + * pending list ==> running list + */ +static void start_pending_queue(struct mmp_pdma_chan *chan) +{ + struct mmp_pdma_desc_sw *desc; + + /* still in running, irq will start the pending list */ + if (!chan->idle) { + dev_dbg(chan->dev, "DMA controller still busy\n"); + return; + } + + if (list_empty(&chan->chain_pending)) { + /* chance to re-fetch phy channel with higher prio */ + mmp_pdma_free_phy(chan); + dev_dbg(chan->dev, "no pending list\n"); + return; + } + + if (!chan->phy) { + chan->phy = lookup_phy(chan); + if (!chan->phy) { + dev_dbg(chan->dev, "no free dma channel\n"); + return; + } + } + + /* + * pending -> running + * reintilize pending list + */ + desc = list_first_entry(&chan->chain_pending, + struct mmp_pdma_desc_sw, node); + list_splice_tail_init(&chan->chain_pending, &chan->chain_running); + + /* + * Program the descriptor's address into the DMA controller, + * then start the DMA transaction + */ + set_desc(chan->phy, desc->async_tx.phys); + enable_chan(chan->phy); + chan->idle = false; +} + + +/* desc->tx_list ==> pending list */ +static dma_cookie_t mmp_pdma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(tx->chan); + struct mmp_pdma_desc_sw *desc = tx_to_mmp_pdma_desc(tx); + struct mmp_pdma_desc_sw *child; + unsigned long flags; + dma_cookie_t cookie = -EBUSY; + + spin_lock_irqsave(&chan->desc_lock, flags); + + list_for_each_entry(child, &desc->tx_list, node) { + cookie = dma_cookie_assign(&child->async_tx); + } + + /* softly link to pending list - desc->tx_list ==> pending list */ + list_splice_tail_init(&desc->tx_list, &chan->chain_pending); + + spin_unlock_irqrestore(&chan->desc_lock, flags); + + return cookie; +} + +static struct mmp_pdma_desc_sw * +mmp_pdma_alloc_descriptor(struct mmp_pdma_chan *chan) +{ + struct mmp_pdma_desc_sw *desc; + dma_addr_t pdesc; + + desc = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &pdesc); + if (!desc) { + dev_err(chan->dev, "out of memory for link descriptor\n"); + return NULL; + } + + memset(desc, 0, sizeof(*desc)); + INIT_LIST_HEAD(&desc->tx_list); + dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan); + /* each desc has submit */ + desc->async_tx.tx_submit = mmp_pdma_tx_submit; + desc->async_tx.phys = pdesc; + + return desc; +} + +/** + * mmp_pdma_alloc_chan_resources - Allocate resources for DMA channel. + * + * This function will create a dma pool for descriptor allocation. + * Request irq only when channel is requested + * Return - The number of allocated descriptors. + */ + +static int mmp_pdma_alloc_chan_resources(struct dma_chan *dchan) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); + + if (chan->desc_pool) + return 1; + + chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device), + chan->dev, + sizeof(struct mmp_pdma_desc_sw), + __alignof__(struct mmp_pdma_desc_sw), + 0); + if (!chan->desc_pool) { + dev_err(chan->dev, "unable to allocate descriptor pool\n"); + return -ENOMEM; + } + + mmp_pdma_free_phy(chan); + chan->idle = true; + chan->dev_addr = 0; + return 1; +} + +static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan, + struct list_head *list) +{ + struct mmp_pdma_desc_sw *desc, *_desc; + + list_for_each_entry_safe(desc, _desc, list, node) { + list_del(&desc->node); + dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys); + } +} + +static void mmp_pdma_free_chan_resources(struct dma_chan *dchan) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); + unsigned long flags; + + spin_lock_irqsave(&chan->desc_lock, flags); + mmp_pdma_free_desc_list(chan, &chan->chain_pending); + mmp_pdma_free_desc_list(chan, &chan->chain_running); + spin_unlock_irqrestore(&chan->desc_lock, flags); + + dma_pool_destroy(chan->desc_pool); + chan->desc_pool = NULL; + chan->idle = true; + chan->dev_addr = 0; + mmp_pdma_free_phy(chan); + return; +} + +static struct dma_async_tx_descriptor * +mmp_pdma_prep_memcpy(struct dma_chan *dchan, + dma_addr_t dma_dst, dma_addr_t dma_src, + size_t len, unsigned long flags) +{ + struct mmp_pdma_chan *chan; + struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new; + size_t copy = 0; + + if (!dchan) + return NULL; + + if (!len) + return NULL; + + chan = to_mmp_pdma_chan(dchan); + chan->byte_align = false; + + if (!chan->dir) { + chan->dir = DMA_MEM_TO_MEM; + chan->dcmd = DCMD_INCTRGADDR | DCMD_INCSRCADDR; + chan->dcmd |= DCMD_BURST32; + } + + do { + /* Allocate the link descriptor from DMA pool */ + new = mmp_pdma_alloc_descriptor(chan); + if (!new) { + dev_err(chan->dev, "no memory for desc\n"); + goto fail; + } + + copy = min_t(size_t, len, PDMA_MAX_DESC_BYTES); + if (dma_src & 0x7 || dma_dst & 0x7) + chan->byte_align = true; + + new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & copy); + new->desc.dsadr = dma_src; + new->desc.dtadr = dma_dst; + + if (!first) + first = new; + else + prev->desc.ddadr = new->async_tx.phys; + + new->async_tx.cookie = 0; + async_tx_ack(&new->async_tx); + + prev = new; + len -= copy; + + if (chan->dir == DMA_MEM_TO_DEV) { + dma_src += copy; + } else if (chan->dir == DMA_DEV_TO_MEM) { + dma_dst += copy; + } else if (chan->dir == DMA_MEM_TO_MEM) { + dma_src += copy; + dma_dst += copy; + } + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + } while (len); + + first->async_tx.flags = flags; /* client is in control of this ack */ + first->async_tx.cookie = -EBUSY; + + /* last desc and fire IRQ */ + new->desc.ddadr = DDADR_STOP; + new->desc.dcmd |= DCMD_ENDIRQEN; + + chan->cyclic_first = NULL; + + return &first->async_tx; + +fail: + if (first) + mmp_pdma_free_desc_list(chan, &first->tx_list); + return NULL; +} + +static struct dma_async_tx_descriptor * +mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction dir, + unsigned long flags, void *context) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); + struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL; + size_t len, avail; + struct scatterlist *sg; + dma_addr_t addr; + int i; + + if ((sgl == NULL) || (sg_len == 0)) + return NULL; + + chan->byte_align = false; + + for_each_sg(sgl, sg, sg_len, i) { + addr = sg_dma_address(sg); + avail = sg_dma_len(sgl); + + do { + len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES); + if (addr & 0x7) + chan->byte_align = true; + + /* allocate and populate the descriptor */ + new = mmp_pdma_alloc_descriptor(chan); + if (!new) { + dev_err(chan->dev, "no memory for desc\n"); + goto fail; + } + + new->desc.dcmd = chan->dcmd | (DCMD_LENGTH & len); + if (dir == DMA_MEM_TO_DEV) { + new->desc.dsadr = addr; + new->desc.dtadr = chan->dev_addr; + } else { + new->desc.dsadr = chan->dev_addr; + new->desc.dtadr = addr; + } + + if (!first) + first = new; + else + prev->desc.ddadr = new->async_tx.phys; + + new->async_tx.cookie = 0; + async_tx_ack(&new->async_tx); + prev = new; + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + + /* update metadata */ + addr += len; + avail -= len; + } while (avail); + } + + first->async_tx.cookie = -EBUSY; + first->async_tx.flags = flags; + + /* last desc and fire IRQ */ + new->desc.ddadr = DDADR_STOP; + new->desc.dcmd |= DCMD_ENDIRQEN; + + chan->dir = dir; + chan->cyclic_first = NULL; + + return &first->async_tx; + +fail: + if (first) + mmp_pdma_free_desc_list(chan, &first->tx_list); + return NULL; +} + +static struct dma_async_tx_descriptor * +mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan, + dma_addr_t buf_addr, size_t len, size_t period_len, + enum dma_transfer_direction direction, + unsigned long flags) +{ + struct mmp_pdma_chan *chan; + struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new; + dma_addr_t dma_src, dma_dst; + + if (!dchan || !len || !period_len) + return NULL; + + /* the buffer length must be a multiple of period_len */ + if (len % period_len != 0) + return NULL; + + if (period_len > PDMA_MAX_DESC_BYTES) + return NULL; + + chan = to_mmp_pdma_chan(dchan); + + switch (direction) { + case DMA_MEM_TO_DEV: + dma_src = buf_addr; + dma_dst = chan->dev_addr; + break; + case DMA_DEV_TO_MEM: + dma_dst = buf_addr; + dma_src = chan->dev_addr; + break; + default: + dev_err(chan->dev, "Unsupported direction for cyclic DMA\n"); + return NULL; + } + + chan->dir = direction; + + do { + /* Allocate the link descriptor from DMA pool */ + new = mmp_pdma_alloc_descriptor(chan); + if (!new) { + dev_err(chan->dev, "no memory for desc\n"); + goto fail; + } + + new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN | + (DCMD_LENGTH & period_len)); + new->desc.dsadr = dma_src; + new->desc.dtadr = dma_dst; + + if (!first) + first = new; + else + prev->desc.ddadr = new->async_tx.phys; + + new->async_tx.cookie = 0; + async_tx_ack(&new->async_tx); + + prev = new; + len -= period_len; + + if (chan->dir == DMA_MEM_TO_DEV) + dma_src += period_len; + else + dma_dst += period_len; + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + } while (len); + + first->async_tx.flags = flags; /* client is in control of this ack */ + first->async_tx.cookie = -EBUSY; + + /* make the cyclic link */ + new->desc.ddadr = first->async_tx.phys; + chan->cyclic_first = first; + + return &first->async_tx; + +fail: + if (first) + mmp_pdma_free_desc_list(chan, &first->tx_list); + return NULL; +} + +static int mmp_pdma_config(struct dma_chan *dchan, + struct dma_slave_config *cfg) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); + u32 maxburst = 0, addr = 0; + enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED; + + if (!dchan) + return -EINVAL; + + if (cfg->direction == DMA_DEV_TO_MEM) { + chan->dcmd = DCMD_INCTRGADDR | DCMD_FLOWSRC; + maxburst = cfg->src_maxburst; + width = cfg->src_addr_width; + addr = cfg->src_addr; + } else if (cfg->direction == DMA_MEM_TO_DEV) { + chan->dcmd = DCMD_INCSRCADDR | DCMD_FLOWTRG; + maxburst = cfg->dst_maxburst; + width = cfg->dst_addr_width; + addr = cfg->dst_addr; + } + + if (width == DMA_SLAVE_BUSWIDTH_1_BYTE) + chan->dcmd |= DCMD_WIDTH1; + else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES) + chan->dcmd |= DCMD_WIDTH2; + else if (width == DMA_SLAVE_BUSWIDTH_4_BYTES) + chan->dcmd |= DCMD_WIDTH4; + + if (maxburst == 8) + chan->dcmd |= DCMD_BURST8; + else if (maxburst == 16) + chan->dcmd |= DCMD_BURST16; + else if (maxburst == 32) + chan->dcmd |= DCMD_BURST32; + + chan->dir = cfg->direction; + chan->dev_addr = addr; + /* FIXME: drivers should be ported over to use the filter + * function. Once that's done, the following two lines can + * be removed. + */ + if (cfg->slave_id) + chan->drcmr = cfg->slave_id; + + return 0; +} + +static int mmp_pdma_terminate_all(struct dma_chan *dchan) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); + unsigned long flags; + + if (!dchan) + return -EINVAL; + + disable_chan(chan->phy); + mmp_pdma_free_phy(chan); + spin_lock_irqsave(&chan->desc_lock, flags); + mmp_pdma_free_desc_list(chan, &chan->chain_pending); + mmp_pdma_free_desc_list(chan, &chan->chain_running); + spin_unlock_irqrestore(&chan->desc_lock, flags); + chan->idle = true; + + return 0; +} + +static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan, + dma_cookie_t cookie) +{ + struct mmp_pdma_desc_sw *sw; + u32 curr, residue = 0; + bool passed = false; + bool cyclic = chan->cyclic_first != NULL; + + /* + * If the channel does not have a phy pointer anymore, it has already + * been completed. Therefore, its residue is 0. + */ + if (!chan->phy) + return 0; + + if (chan->dir == DMA_DEV_TO_MEM) + curr = readl(chan->phy->base + DTADR(chan->phy->idx)); + else + curr = readl(chan->phy->base + DSADR(chan->phy->idx)); + + list_for_each_entry(sw, &chan->chain_running, node) { + u32 start, end, len; + + if (chan->dir == DMA_DEV_TO_MEM) + start = sw->desc.dtadr; + else + start = sw->desc.dsadr; + + len = sw->desc.dcmd & DCMD_LENGTH; + end = start + len; + + /* + * 'passed' will be latched once we found the descriptor which + * lies inside the boundaries of the curr pointer. All + * descriptors that occur in the list _after_ we found that + * partially handled descriptor are still to be processed and + * are hence added to the residual bytes counter. + */ + + if (passed) { + residue += len; + } else if (curr >= start && curr <= end) { + residue += end - curr; + passed = true; + } + + /* + * Descriptors that have the ENDIRQEN bit set mark the end of a + * transaction chain, and the cookie assigned with it has been + * returned previously from mmp_pdma_tx_submit(). + * + * In case we have multiple transactions in the running chain, + * and the cookie does not match the one the user asked us + * about, reset the state variables and start over. + * + * This logic does not apply to cyclic transactions, where all + * descriptors have the ENDIRQEN bit set, and for which we + * can't have multiple transactions on one channel anyway. + */ + if (cyclic || !(sw->desc.dcmd & DCMD_ENDIRQEN)) + continue; + + if (sw->async_tx.cookie == cookie) { + return residue; + } else { + residue = 0; + passed = false; + } + } + + /* We should only get here in case of cyclic transactions */ + return residue; +} + +static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); + enum dma_status ret; + + ret = dma_cookie_status(dchan, cookie, txstate); + if (likely(ret != DMA_ERROR)) + dma_set_residue(txstate, mmp_pdma_residue(chan, cookie)); + + return ret; +} + +/** + * mmp_pdma_issue_pending - Issue the DMA start command + * pending list ==> running list + */ +static void mmp_pdma_issue_pending(struct dma_chan *dchan) +{ + struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan); + unsigned long flags; + + spin_lock_irqsave(&chan->desc_lock, flags); + start_pending_queue(chan); + spin_unlock_irqrestore(&chan->desc_lock, flags); +} + +/* + * dma_do_tasklet + * Do call back + * Start pending list + */ +static void dma_do_tasklet(unsigned long data) +{ + struct mmp_pdma_chan *chan = (struct mmp_pdma_chan *)data; + struct mmp_pdma_desc_sw *desc, *_desc; + LIST_HEAD(chain_cleanup); + unsigned long flags; + + if (chan->cyclic_first) { + dma_async_tx_callback cb = NULL; + void *cb_data = NULL; + + spin_lock_irqsave(&chan->desc_lock, flags); + desc = chan->cyclic_first; + cb = desc->async_tx.callback; + cb_data = desc->async_tx.callback_param; + spin_unlock_irqrestore(&chan->desc_lock, flags); + + if (cb) + cb(cb_data); + + return; + } + + /* submit pending list; callback for each desc; free desc */ + spin_lock_irqsave(&chan->desc_lock, flags); + + list_for_each_entry_safe(desc, _desc, &chan->chain_running, node) { + /* + * move the descriptors to a temporary list so we can drop + * the lock during the entire cleanup operation + */ + list_move(&desc->node, &chain_cleanup); + + /* + * Look for the first list entry which has the ENDIRQEN flag + * set. That is the descriptor we got an interrupt for, so + * complete that transaction and its cookie. + */ + if (desc->desc.dcmd & DCMD_ENDIRQEN) { + dma_cookie_t cookie = desc->async_tx.cookie; + dma_cookie_complete(&desc->async_tx); + dev_dbg(chan->dev, "completed_cookie=%d\n", cookie); + break; + } + } + + /* + * The hardware is idle and ready for more when the + * chain_running list is empty. + */ + chan->idle = list_empty(&chan->chain_running); + + /* Start any pending transactions automatically */ + start_pending_queue(chan); + spin_unlock_irqrestore(&chan->desc_lock, flags); + + /* Run the callback for each descriptor, in order */ + list_for_each_entry_safe(desc, _desc, &chain_cleanup, node) { + struct dma_async_tx_descriptor *txd = &desc->async_tx; + + /* Remove from the list of transactions */ + list_del(&desc->node); + /* Run the link descriptor callback function */ + if (txd->callback) + txd->callback(txd->callback_param); + + dma_pool_free(chan->desc_pool, desc, txd->phys); + } +} + +static int mmp_pdma_remove(struct platform_device *op) +{ + struct mmp_pdma_device *pdev = platform_get_drvdata(op); + + dma_async_device_unregister(&pdev->device); + return 0; +} + +static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq) +{ + struct mmp_pdma_phy *phy = &pdev->phy[idx]; + struct mmp_pdma_chan *chan; + int ret; + + chan = devm_kzalloc(pdev->dev, sizeof(*chan), GFP_KERNEL); + if (chan == NULL) + return -ENOMEM; + + phy->idx = idx; + phy->base = pdev->base; + + if (irq) { + ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler, + IRQF_SHARED, "pdma", phy); + if (ret) { + dev_err(pdev->dev, "channel request irq fail!\n"); + return ret; + } + } + + spin_lock_init(&chan->desc_lock); + chan->dev = pdev->dev; + chan->chan.device = &pdev->device; + tasklet_init(&chan->tasklet, dma_do_tasklet, (unsigned long)chan); + INIT_LIST_HEAD(&chan->chain_pending); + INIT_LIST_HEAD(&chan->chain_running); + + /* register virt channel to dma engine */ + list_add_tail(&chan->chan.device_node, &pdev->device.channels); + + return 0; +} + +static const struct of_device_id mmp_pdma_dt_ids[] = { + { .compatible = "marvell,pdma-1.0", }, + {} +}; +MODULE_DEVICE_TABLE(of, mmp_pdma_dt_ids); + +static struct dma_chan *mmp_pdma_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct mmp_pdma_device *d = ofdma->of_dma_data; + struct dma_chan *chan; + + chan = dma_get_any_slave_channel(&d->device); + if (!chan) + return NULL; + + to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0]; + + return chan; +} + +static int mmp_pdma_probe(struct platform_device *op) +{ + struct mmp_pdma_device *pdev; + const struct of_device_id *of_id; + struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev); + struct resource *iores; + int i, ret, irq = 0; + int dma_channels = 0, irq_num = 0; + const enum dma_slave_buswidth widths = + DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES | + DMA_SLAVE_BUSWIDTH_4_BYTES; + + pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL); + if (!pdev) + return -ENOMEM; + + pdev->dev = &op->dev; + + spin_lock_init(&pdev->phy_lock); + + iores = platform_get_resource(op, IORESOURCE_MEM, 0); + pdev->base = devm_ioremap_resource(pdev->dev, iores); + if (IS_ERR(pdev->base)) + return PTR_ERR(pdev->base); + + of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev); + if (of_id) + of_property_read_u32(pdev->dev->of_node, "#dma-channels", + &dma_channels); + else if (pdata && pdata->dma_channels) + dma_channels = pdata->dma_channels; + else + dma_channels = 32; /* default 32 channel */ + pdev->dma_channels = dma_channels; + + for (i = 0; i < dma_channels; i++) { + if (platform_get_irq(op, i) > 0) + irq_num++; + } + + pdev->phy = devm_kcalloc(pdev->dev, dma_channels, sizeof(*pdev->phy), + GFP_KERNEL); + if (pdev->phy == NULL) + return -ENOMEM; + + INIT_LIST_HEAD(&pdev->device.channels); + + if (irq_num != dma_channels) { + /* all chan share one irq, demux inside */ + irq = platform_get_irq(op, 0); + ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler, + IRQF_SHARED, "pdma", pdev); + if (ret) + return ret; + } + + for (i = 0; i < dma_channels; i++) { + irq = (irq_num != dma_channels) ? 0 : platform_get_irq(op, i); + ret = mmp_pdma_chan_init(pdev, i, irq); + if (ret) + return ret; + } + + dma_cap_set(DMA_SLAVE, pdev->device.cap_mask); + dma_cap_set(DMA_MEMCPY, pdev->device.cap_mask); + dma_cap_set(DMA_CYCLIC, pdev->device.cap_mask); + dma_cap_set(DMA_PRIVATE, pdev->device.cap_mask); + pdev->device.dev = &op->dev; + pdev->device.device_alloc_chan_resources = mmp_pdma_alloc_chan_resources; + pdev->device.device_free_chan_resources = mmp_pdma_free_chan_resources; + pdev->device.device_tx_status = mmp_pdma_tx_status; + pdev->device.device_prep_dma_memcpy = mmp_pdma_prep_memcpy; + pdev->device.device_prep_slave_sg = mmp_pdma_prep_slave_sg; + pdev->device.device_prep_dma_cyclic = mmp_pdma_prep_dma_cyclic; + pdev->device.device_issue_pending = mmp_pdma_issue_pending; + pdev->device.device_config = mmp_pdma_config; + pdev->device.device_terminate_all = mmp_pdma_terminate_all; + pdev->device.copy_align = PDMA_ALIGNMENT; + pdev->device.src_addr_widths = widths; + pdev->device.dst_addr_widths = widths; + pdev->device.directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); + pdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; + + if (pdev->dev->coherent_dma_mask) + dma_set_mask(pdev->dev, pdev->dev->coherent_dma_mask); + else + dma_set_mask(pdev->dev, DMA_BIT_MASK(64)); + + ret = dma_async_device_register(&pdev->device); + if (ret) { + dev_err(pdev->device.dev, "unable to register\n"); + return ret; + } + + if (op->dev.of_node) { + /* Device-tree DMA controller registration */ + ret = of_dma_controller_register(op->dev.of_node, + mmp_pdma_dma_xlate, pdev); + if (ret < 0) { + dev_err(&op->dev, "of_dma_controller_register failed\n"); + return ret; + } + } + + platform_set_drvdata(op, pdev); + dev_info(pdev->device.dev, "initialized %d channels\n", dma_channels); + return 0; +} + +static const struct platform_device_id mmp_pdma_id_table[] = { + { "mmp-pdma", }, + { }, +}; + +static struct platform_driver mmp_pdma_driver = { + .driver = { + .name = "mmp-pdma", + .of_match_table = mmp_pdma_dt_ids, + }, + .id_table = mmp_pdma_id_table, + .probe = mmp_pdma_probe, + .remove = mmp_pdma_remove, +}; + +bool mmp_pdma_filter_fn(struct dma_chan *chan, void *param) +{ + struct mmp_pdma_chan *c = to_mmp_pdma_chan(chan); + + if (chan->device->dev->driver != &mmp_pdma_driver.driver) + return false; + + c->drcmr = *(unsigned int *)param; + + return true; +} +EXPORT_SYMBOL_GPL(mmp_pdma_filter_fn); + +module_platform_driver(mmp_pdma_driver); + +MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver"); +MODULE_AUTHOR("Marvell International Ltd."); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c new file mode 100644 index 000000000..449e785de --- /dev/null +++ b/drivers/dma/mmp_tdma.c @@ -0,0 +1,745 @@ +/* + * Driver For Marvell Two-channel DMA Engine + * + * Copyright: Marvell International Ltd. + * + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + */ + +#include <linux/err.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/device.h> +#include <linux/platform_data/dma-mmp_tdma.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> + +#include "dmaengine.h" + +/* + * Two-Channel DMA registers + */ +#define TDBCR 0x00 /* Byte Count */ +#define TDSAR 0x10 /* Src Addr */ +#define TDDAR 0x20 /* Dst Addr */ +#define TDNDPR 0x30 /* Next Desc */ +#define TDCR 0x40 /* Control */ +#define TDCP 0x60 /* Priority*/ +#define TDCDPR 0x70 /* Current Desc */ +#define TDIMR 0x80 /* Int Mask */ +#define TDISR 0xa0 /* Int Status */ + +/* Two-Channel DMA Control Register */ +#define TDCR_SSZ_8_BITS (0x0 << 22) /* Sample Size */ +#define TDCR_SSZ_12_BITS (0x1 << 22) +#define TDCR_SSZ_16_BITS (0x2 << 22) +#define TDCR_SSZ_20_BITS (0x3 << 22) +#define TDCR_SSZ_24_BITS (0x4 << 22) +#define TDCR_SSZ_32_BITS (0x5 << 22) +#define TDCR_SSZ_SHIFT (0x1 << 22) +#define TDCR_SSZ_MASK (0x7 << 22) +#define TDCR_SSPMOD (0x1 << 21) /* SSP MOD */ +#define TDCR_ABR (0x1 << 20) /* Channel Abort */ +#define TDCR_CDE (0x1 << 17) /* Close Desc Enable */ +#define TDCR_PACKMOD (0x1 << 16) /* Pack Mode (ADMA Only) */ +#define TDCR_CHANACT (0x1 << 14) /* Channel Active */ +#define TDCR_FETCHND (0x1 << 13) /* Fetch Next Desc */ +#define TDCR_CHANEN (0x1 << 12) /* Channel Enable */ +#define TDCR_INTMODE (0x1 << 10) /* Interrupt Mode */ +#define TDCR_CHAINMOD (0x1 << 9) /* Chain Mode */ +#define TDCR_BURSTSZ_MSK (0x7 << 6) /* Burst Size */ +#define TDCR_BURSTSZ_4B (0x0 << 6) +#define TDCR_BURSTSZ_8B (0x1 << 6) +#define TDCR_BURSTSZ_16B (0x3 << 6) +#define TDCR_BURSTSZ_32B (0x6 << 6) +#define TDCR_BURSTSZ_64B (0x7 << 6) +#define TDCR_BURSTSZ_SQU_1B (0x5 << 6) +#define TDCR_BURSTSZ_SQU_2B (0x6 << 6) +#define TDCR_BURSTSZ_SQU_4B (0x0 << 6) +#define TDCR_BURSTSZ_SQU_8B (0x1 << 6) +#define TDCR_BURSTSZ_SQU_16B (0x3 << 6) +#define TDCR_BURSTSZ_SQU_32B (0x7 << 6) +#define TDCR_BURSTSZ_128B (0x5 << 6) +#define TDCR_DSTDIR_MSK (0x3 << 4) /* Dst Direction */ +#define TDCR_DSTDIR_ADDR_HOLD (0x2 << 4) /* Dst Addr Hold */ +#define TDCR_DSTDIR_ADDR_INC (0x0 << 4) /* Dst Addr Increment */ +#define TDCR_SRCDIR_MSK (0x3 << 2) /* Src Direction */ +#define TDCR_SRCDIR_ADDR_HOLD (0x2 << 2) /* Src Addr Hold */ +#define TDCR_SRCDIR_ADDR_INC (0x0 << 2) /* Src Addr Increment */ +#define TDCR_DSTDESCCONT (0x1 << 1) +#define TDCR_SRCDESTCONT (0x1 << 0) + +/* Two-Channel DMA Int Mask Register */ +#define TDIMR_COMP (0x1 << 0) + +/* Two-Channel DMA Int Status Register */ +#define TDISR_COMP (0x1 << 0) + +/* + * Two-Channel DMA Descriptor Struct + * NOTE: desc's buf must be aligned to 16 bytes. + */ +struct mmp_tdma_desc { + u32 byte_cnt; + u32 src_addr; + u32 dst_addr; + u32 nxt_desc; +}; + +enum mmp_tdma_type { + MMP_AUD_TDMA = 0, + PXA910_SQU, +}; + +#define TDMA_ALIGNMENT 3 +#define TDMA_MAX_XFER_BYTES SZ_64K + +struct mmp_tdma_chan { + struct device *dev; + struct dma_chan chan; + struct dma_async_tx_descriptor desc; + struct tasklet_struct tasklet; + + struct mmp_tdma_desc *desc_arr; + dma_addr_t desc_arr_phys; + int desc_num; + enum dma_transfer_direction dir; + dma_addr_t dev_addr; + u32 burst_sz; + enum dma_slave_buswidth buswidth; + enum dma_status status; + + int idx; + enum mmp_tdma_type type; + int irq; + void __iomem *reg_base; + + size_t buf_len; + size_t period_len; + size_t pos; + + struct gen_pool *pool; +}; + +#define TDMA_CHANNEL_NUM 2 +struct mmp_tdma_device { + struct device *dev; + void __iomem *base; + struct dma_device device; + struct mmp_tdma_chan *tdmac[TDMA_CHANNEL_NUM]; +}; + +#define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan) + +static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys) +{ + writel(phys, tdmac->reg_base + TDNDPR); + writel(readl(tdmac->reg_base + TDCR) | TDCR_FETCHND, + tdmac->reg_base + TDCR); +} + +static void mmp_tdma_enable_irq(struct mmp_tdma_chan *tdmac, bool enable) +{ + if (enable) + writel(TDIMR_COMP, tdmac->reg_base + TDIMR); + else + writel(0, tdmac->reg_base + TDIMR); +} + +static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac) +{ + /* enable dma chan */ + writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN, + tdmac->reg_base + TDCR); + tdmac->status = DMA_IN_PROGRESS; +} + +static int mmp_tdma_disable_chan(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + u32 tdcr; + + tdcr = readl(tdmac->reg_base + TDCR); + tdcr |= TDCR_ABR; + tdcr &= ~TDCR_CHANEN; + writel(tdcr, tdmac->reg_base + TDCR); + + tdmac->status = DMA_COMPLETE; + + return 0; +} + +static int mmp_tdma_resume_chan(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + + writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN, + tdmac->reg_base + TDCR); + tdmac->status = DMA_IN_PROGRESS; + + return 0; +} + +static int mmp_tdma_pause_chan(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + + writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN, + tdmac->reg_base + TDCR); + tdmac->status = DMA_PAUSED; + + return 0; +} + +static int mmp_tdma_config_chan(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + unsigned int tdcr = 0; + + mmp_tdma_disable_chan(chan); + + if (tdmac->dir == DMA_MEM_TO_DEV) + tdcr = TDCR_DSTDIR_ADDR_HOLD | TDCR_SRCDIR_ADDR_INC; + else if (tdmac->dir == DMA_DEV_TO_MEM) + tdcr = TDCR_SRCDIR_ADDR_HOLD | TDCR_DSTDIR_ADDR_INC; + + if (tdmac->type == MMP_AUD_TDMA) { + tdcr |= TDCR_PACKMOD; + + switch (tdmac->burst_sz) { + case 4: + tdcr |= TDCR_BURSTSZ_4B; + break; + case 8: + tdcr |= TDCR_BURSTSZ_8B; + break; + case 16: + tdcr |= TDCR_BURSTSZ_16B; + break; + case 32: + tdcr |= TDCR_BURSTSZ_32B; + break; + case 64: + tdcr |= TDCR_BURSTSZ_64B; + break; + case 128: + tdcr |= TDCR_BURSTSZ_128B; + break; + default: + dev_err(tdmac->dev, "mmp_tdma: unknown burst size.\n"); + return -EINVAL; + } + + switch (tdmac->buswidth) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + tdcr |= TDCR_SSZ_8_BITS; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + tdcr |= TDCR_SSZ_16_BITS; + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + tdcr |= TDCR_SSZ_32_BITS; + break; + default: + dev_err(tdmac->dev, "mmp_tdma: unknown bus size.\n"); + return -EINVAL; + } + } else if (tdmac->type == PXA910_SQU) { + tdcr |= TDCR_SSPMOD; + + switch (tdmac->burst_sz) { + case 1: + tdcr |= TDCR_BURSTSZ_SQU_1B; + break; + case 2: + tdcr |= TDCR_BURSTSZ_SQU_2B; + break; + case 4: + tdcr |= TDCR_BURSTSZ_SQU_4B; + break; + case 8: + tdcr |= TDCR_BURSTSZ_SQU_8B; + break; + case 16: + tdcr |= TDCR_BURSTSZ_SQU_16B; + break; + case 32: + tdcr |= TDCR_BURSTSZ_SQU_32B; + break; + default: + dev_err(tdmac->dev, "mmp_tdma: unknown burst size.\n"); + return -EINVAL; + } + } + + writel(tdcr, tdmac->reg_base + TDCR); + return 0; +} + +static int mmp_tdma_clear_chan_irq(struct mmp_tdma_chan *tdmac) +{ + u32 reg = readl(tdmac->reg_base + TDISR); + + if (reg & TDISR_COMP) { + /* clear irq */ + reg &= ~TDISR_COMP; + writel(reg, tdmac->reg_base + TDISR); + + return 0; + } + return -EAGAIN; +} + +static size_t mmp_tdma_get_pos(struct mmp_tdma_chan *tdmac) +{ + size_t reg; + + if (tdmac->idx == 0) { + reg = __raw_readl(tdmac->reg_base + TDSAR); + reg -= tdmac->desc_arr[0].src_addr; + } else if (tdmac->idx == 1) { + reg = __raw_readl(tdmac->reg_base + TDDAR); + reg -= tdmac->desc_arr[0].dst_addr; + } else + return -EINVAL; + + return reg; +} + +static irqreturn_t mmp_tdma_chan_handler(int irq, void *dev_id) +{ + struct mmp_tdma_chan *tdmac = dev_id; + + if (mmp_tdma_clear_chan_irq(tdmac) == 0) { + tasklet_schedule(&tdmac->tasklet); + return IRQ_HANDLED; + } else + return IRQ_NONE; +} + +static irqreturn_t mmp_tdma_int_handler(int irq, void *dev_id) +{ + struct mmp_tdma_device *tdev = dev_id; + int i, ret; + int irq_num = 0; + + for (i = 0; i < TDMA_CHANNEL_NUM; i++) { + struct mmp_tdma_chan *tdmac = tdev->tdmac[i]; + + ret = mmp_tdma_chan_handler(irq, tdmac); + if (ret == IRQ_HANDLED) + irq_num++; + } + + if (irq_num) + return IRQ_HANDLED; + else + return IRQ_NONE; +} + +static void dma_do_tasklet(unsigned long data) +{ + struct mmp_tdma_chan *tdmac = (struct mmp_tdma_chan *)data; + + if (tdmac->desc.callback) + tdmac->desc.callback(tdmac->desc.callback_param); + +} + +static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac) +{ + struct gen_pool *gpool; + int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc); + + gpool = tdmac->pool; + if (gpool && tdmac->desc_arr) + gen_pool_free(gpool, (unsigned long)tdmac->desc_arr, + size); + tdmac->desc_arr = NULL; + + return; +} + +static dma_cookie_t mmp_tdma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(tx->chan); + + mmp_tdma_chan_set_desc(tdmac, tdmac->desc_arr_phys); + + return 0; +} + +static int mmp_tdma_alloc_chan_resources(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + int ret; + + dma_async_tx_descriptor_init(&tdmac->desc, chan); + tdmac->desc.tx_submit = mmp_tdma_tx_submit; + + if (tdmac->irq) { + ret = devm_request_irq(tdmac->dev, tdmac->irq, + mmp_tdma_chan_handler, 0, "tdma", tdmac); + if (ret) + return ret; + } + return 1; +} + +static void mmp_tdma_free_chan_resources(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + + if (tdmac->irq) + devm_free_irq(tdmac->dev, tdmac->irq, tdmac); + mmp_tdma_free_descriptor(tdmac); + return; +} + +struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac) +{ + struct gen_pool *gpool; + int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc); + + gpool = tdmac->pool; + if (!gpool) + return NULL; + + tdmac->desc_arr = gen_pool_dma_alloc(gpool, size, &tdmac->desc_arr_phys); + + return tdmac->desc_arr; +} + +static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + struct mmp_tdma_desc *desc; + int num_periods = buf_len / period_len; + int i = 0, buf = 0; + + if (tdmac->status != DMA_COMPLETE) + return NULL; + + if (period_len > TDMA_MAX_XFER_BYTES) { + dev_err(tdmac->dev, + "maximum period size exceeded: %d > %d\n", + period_len, TDMA_MAX_XFER_BYTES); + goto err_out; + } + + tdmac->status = DMA_IN_PROGRESS; + tdmac->desc_num = num_periods; + desc = mmp_tdma_alloc_descriptor(tdmac); + if (!desc) + goto err_out; + + while (buf < buf_len) { + desc = &tdmac->desc_arr[i]; + + if (i + 1 == num_periods) + desc->nxt_desc = tdmac->desc_arr_phys; + else + desc->nxt_desc = tdmac->desc_arr_phys + + sizeof(*desc) * (i + 1); + + if (direction == DMA_MEM_TO_DEV) { + desc->src_addr = dma_addr; + desc->dst_addr = tdmac->dev_addr; + } else { + desc->src_addr = tdmac->dev_addr; + desc->dst_addr = dma_addr; + } + desc->byte_cnt = period_len; + dma_addr += period_len; + buf += period_len; + i++; + } + + /* enable interrupt */ + if (flags & DMA_PREP_INTERRUPT) + mmp_tdma_enable_irq(tdmac, true); + + tdmac->buf_len = buf_len; + tdmac->period_len = period_len; + tdmac->pos = 0; + + return &tdmac->desc; + +err_out: + tdmac->status = DMA_ERROR; + return NULL; +} + +static int mmp_tdma_terminate_all(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + + mmp_tdma_disable_chan(chan); + /* disable interrupt */ + mmp_tdma_enable_irq(tdmac, false); + + return 0; +} + +static int mmp_tdma_config(struct dma_chan *chan, + struct dma_slave_config *dmaengine_cfg) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + + if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) { + tdmac->dev_addr = dmaengine_cfg->src_addr; + tdmac->burst_sz = dmaengine_cfg->src_maxburst; + tdmac->buswidth = dmaengine_cfg->src_addr_width; + } else { + tdmac->dev_addr = dmaengine_cfg->dst_addr; + tdmac->burst_sz = dmaengine_cfg->dst_maxburst; + tdmac->buswidth = dmaengine_cfg->dst_addr_width; + } + tdmac->dir = dmaengine_cfg->direction; + + return mmp_tdma_config_chan(chan); +} + +static enum dma_status mmp_tdma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + + tdmac->pos = mmp_tdma_get_pos(tdmac); + dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, + tdmac->buf_len - tdmac->pos); + + return tdmac->status; +} + +static void mmp_tdma_issue_pending(struct dma_chan *chan) +{ + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + + mmp_tdma_enable_chan(tdmac); +} + +static int mmp_tdma_remove(struct platform_device *pdev) +{ + struct mmp_tdma_device *tdev = platform_get_drvdata(pdev); + + dma_async_device_unregister(&tdev->device); + return 0; +} + +static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev, + int idx, int irq, + int type, struct gen_pool *pool) +{ + struct mmp_tdma_chan *tdmac; + + if (idx >= TDMA_CHANNEL_NUM) { + dev_err(tdev->dev, "too many channels for device!\n"); + return -EINVAL; + } + + /* alloc channel */ + tdmac = devm_kzalloc(tdev->dev, sizeof(*tdmac), GFP_KERNEL); + if (!tdmac) { + dev_err(tdev->dev, "no free memory for DMA channels!\n"); + return -ENOMEM; + } + if (irq) + tdmac->irq = irq; + tdmac->dev = tdev->dev; + tdmac->chan.device = &tdev->device; + tdmac->idx = idx; + tdmac->type = type; + tdmac->reg_base = tdev->base + idx * 4; + tdmac->pool = pool; + tdmac->status = DMA_COMPLETE; + tdev->tdmac[tdmac->idx] = tdmac; + tasklet_init(&tdmac->tasklet, dma_do_tasklet, (unsigned long)tdmac); + + /* add the channel to tdma_chan list */ + list_add_tail(&tdmac->chan.device_node, + &tdev->device.channels); + return 0; +} + +struct mmp_tdma_filter_param { + struct device_node *of_node; + unsigned int chan_id; +}; + +static bool mmp_tdma_filter_fn(struct dma_chan *chan, void *fn_param) +{ + struct mmp_tdma_filter_param *param = fn_param; + struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan); + struct dma_device *pdma_device = tdmac->chan.device; + + if (pdma_device->dev->of_node != param->of_node) + return false; + + if (chan->chan_id != param->chan_id) + return false; + + return true; +} + +struct dma_chan *mmp_tdma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct mmp_tdma_device *tdev = ofdma->of_dma_data; + dma_cap_mask_t mask = tdev->device.cap_mask; + struct mmp_tdma_filter_param param; + + if (dma_spec->args_count != 1) + return NULL; + + param.of_node = ofdma->of_node; + param.chan_id = dma_spec->args[0]; + + if (param.chan_id >= TDMA_CHANNEL_NUM) + return NULL; + + return dma_request_channel(mask, mmp_tdma_filter_fn, ¶m); +} + +static const struct of_device_id mmp_tdma_dt_ids[] = { + { .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA}, + { .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU}, + {} +}; +MODULE_DEVICE_TABLE(of, mmp_tdma_dt_ids); + +static int mmp_tdma_probe(struct platform_device *pdev) +{ + enum mmp_tdma_type type; + const struct of_device_id *of_id; + struct mmp_tdma_device *tdev; + struct resource *iores; + int i, ret; + int irq = 0, irq_num = 0; + int chan_num = TDMA_CHANNEL_NUM; + struct gen_pool *pool = NULL; + + of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev); + if (of_id) + type = (enum mmp_tdma_type) of_id->data; + else + type = platform_get_device_id(pdev)->driver_data; + + /* always have couple channels */ + tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL); + if (!tdev) + return -ENOMEM; + + tdev->dev = &pdev->dev; + + for (i = 0; i < chan_num; i++) { + if (platform_get_irq(pdev, i) > 0) + irq_num++; + } + + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tdev->base = devm_ioremap_resource(&pdev->dev, iores); + if (IS_ERR(tdev->base)) + return PTR_ERR(tdev->base); + + INIT_LIST_HEAD(&tdev->device.channels); + + if (pdev->dev.of_node) + pool = of_get_named_gen_pool(pdev->dev.of_node, "asram", 0); + else + pool = sram_get_gpool("asram"); + if (!pool) { + dev_err(&pdev->dev, "asram pool not available\n"); + return -ENOMEM; + } + + if (irq_num != chan_num) { + irq = platform_get_irq(pdev, 0); + ret = devm_request_irq(&pdev->dev, irq, + mmp_tdma_int_handler, 0, "tdma", tdev); + if (ret) + return ret; + } + + /* initialize channel parameters */ + for (i = 0; i < chan_num; i++) { + irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i); + ret = mmp_tdma_chan_init(tdev, i, irq, type, pool); + if (ret) + return ret; + } + + dma_cap_set(DMA_SLAVE, tdev->device.cap_mask); + dma_cap_set(DMA_CYCLIC, tdev->device.cap_mask); + tdev->device.dev = &pdev->dev; + tdev->device.device_alloc_chan_resources = + mmp_tdma_alloc_chan_resources; + tdev->device.device_free_chan_resources = + mmp_tdma_free_chan_resources; + tdev->device.device_prep_dma_cyclic = mmp_tdma_prep_dma_cyclic; + tdev->device.device_tx_status = mmp_tdma_tx_status; + tdev->device.device_issue_pending = mmp_tdma_issue_pending; + tdev->device.device_config = mmp_tdma_config; + tdev->device.device_pause = mmp_tdma_pause_chan; + tdev->device.device_resume = mmp_tdma_resume_chan; + tdev->device.device_terminate_all = mmp_tdma_terminate_all; + tdev->device.copy_align = TDMA_ALIGNMENT; + + dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)); + platform_set_drvdata(pdev, tdev); + + ret = dma_async_device_register(&tdev->device); + if (ret) { + dev_err(tdev->device.dev, "unable to register\n"); + return ret; + } + + if (pdev->dev.of_node) { + ret = of_dma_controller_register(pdev->dev.of_node, + mmp_tdma_xlate, tdev); + if (ret) { + dev_err(tdev->device.dev, + "failed to register controller\n"); + dma_async_device_unregister(&tdev->device); + } + } + + dev_info(tdev->device.dev, "initialized\n"); + return 0; +} + +static const struct platform_device_id mmp_tdma_id_table[] = { + { "mmp-adma", MMP_AUD_TDMA }, + { "pxa910-squ", PXA910_SQU }, + { }, +}; + +static struct platform_driver mmp_tdma_driver = { + .driver = { + .name = "mmp-tdma", + .of_match_table = mmp_tdma_dt_ids, + }, + .id_table = mmp_tdma_id_table, + .probe = mmp_tdma_probe, + .remove = mmp_tdma_remove, +}; + +module_platform_driver(mmp_tdma_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("MMP Two-Channel DMA Driver"); +MODULE_ALIAS("platform:mmp-tdma"); +MODULE_AUTHOR("Leo Yan <leoy@marvell.com>"); +MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>"); diff --git a/drivers/dma/moxart-dma.c b/drivers/dma/moxart-dma.c new file mode 100644 index 000000000..b4634109e --- /dev/null +++ b/drivers/dma/moxart-dma.c @@ -0,0 +1,679 @@ +/* + * MOXA ART SoCs DMA Engine support. + * + * Copyright (C) 2013 Jonas Jensen + * + * Jonas Jensen <jonas.jensen@gmail.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_dma.h> +#include <linux/bitops.h> + +#include <asm/cacheflush.h> + +#include "dmaengine.h" +#include "virt-dma.h" + +#define APB_DMA_MAX_CHANNEL 4 + +#define REG_OFF_ADDRESS_SOURCE 0 +#define REG_OFF_ADDRESS_DEST 4 +#define REG_OFF_CYCLES 8 +#define REG_OFF_CTRL 12 +#define REG_OFF_CHAN_SIZE 16 + +#define APB_DMA_ENABLE BIT(0) +#define APB_DMA_FIN_INT_STS BIT(1) +#define APB_DMA_FIN_INT_EN BIT(2) +#define APB_DMA_BURST_MODE BIT(3) +#define APB_DMA_ERR_INT_STS BIT(4) +#define APB_DMA_ERR_INT_EN BIT(5) + +/* + * Unset: APB + * Set: AHB + */ +#define APB_DMA_SOURCE_SELECT 0x40 +#define APB_DMA_DEST_SELECT 0x80 + +#define APB_DMA_SOURCE 0x100 +#define APB_DMA_DEST 0x1000 + +#define APB_DMA_SOURCE_MASK 0x700 +#define APB_DMA_DEST_MASK 0x7000 + +/* + * 000: No increment + * 001: +1 (Burst=0), +4 (Burst=1) + * 010: +2 (Burst=0), +8 (Burst=1) + * 011: +4 (Burst=0), +16 (Burst=1) + * 101: -1 (Burst=0), -4 (Burst=1) + * 110: -2 (Burst=0), -8 (Burst=1) + * 111: -4 (Burst=0), -16 (Burst=1) + */ +#define APB_DMA_SOURCE_INC_0 0 +#define APB_DMA_SOURCE_INC_1_4 0x100 +#define APB_DMA_SOURCE_INC_2_8 0x200 +#define APB_DMA_SOURCE_INC_4_16 0x300 +#define APB_DMA_SOURCE_DEC_1_4 0x500 +#define APB_DMA_SOURCE_DEC_2_8 0x600 +#define APB_DMA_SOURCE_DEC_4_16 0x700 +#define APB_DMA_DEST_INC_0 0 +#define APB_DMA_DEST_INC_1_4 0x1000 +#define APB_DMA_DEST_INC_2_8 0x2000 +#define APB_DMA_DEST_INC_4_16 0x3000 +#define APB_DMA_DEST_DEC_1_4 0x5000 +#define APB_DMA_DEST_DEC_2_8 0x6000 +#define APB_DMA_DEST_DEC_4_16 0x7000 + +/* + * Request signal select source/destination address for DMA hardware handshake. + * + * The request line number is a property of the DMA controller itself, + * e.g. MMC must always request channels where dma_slave_config->slave_id is 5. + * + * 0: No request / Grant signal + * 1-15: Request / Grant signal + */ +#define APB_DMA_SOURCE_REQ_NO 0x1000000 +#define APB_DMA_SOURCE_REQ_NO_MASK 0xf000000 +#define APB_DMA_DEST_REQ_NO 0x10000 +#define APB_DMA_DEST_REQ_NO_MASK 0xf0000 + +#define APB_DMA_DATA_WIDTH 0x100000 +#define APB_DMA_DATA_WIDTH_MASK 0x300000 +/* + * Data width of transfer: + * + * 00: Word + * 01: Half + * 10: Byte + */ +#define APB_DMA_DATA_WIDTH_4 0 +#define APB_DMA_DATA_WIDTH_2 0x100000 +#define APB_DMA_DATA_WIDTH_1 0x200000 + +#define APB_DMA_CYCLES_MASK 0x00ffffff + +#define MOXART_DMA_DATA_TYPE_S8 0x00 +#define MOXART_DMA_DATA_TYPE_S16 0x01 +#define MOXART_DMA_DATA_TYPE_S32 0x02 + +struct moxart_sg { + dma_addr_t addr; + uint32_t len; +}; + +struct moxart_desc { + enum dma_transfer_direction dma_dir; + dma_addr_t dev_addr; + unsigned int sglen; + unsigned int dma_cycles; + struct virt_dma_desc vd; + uint8_t es; + struct moxart_sg sg[0]; +}; + +struct moxart_chan { + struct virt_dma_chan vc; + + void __iomem *base; + struct moxart_desc *desc; + + struct dma_slave_config cfg; + + bool allocated; + bool error; + int ch_num; + unsigned int line_reqno; + unsigned int sgidx; +}; + +struct moxart_dmadev { + struct dma_device dma_slave; + struct moxart_chan slave_chans[APB_DMA_MAX_CHANNEL]; +}; + +struct moxart_filter_data { + struct moxart_dmadev *mdc; + struct of_phandle_args *dma_spec; +}; + +static const unsigned int es_bytes[] = { + [MOXART_DMA_DATA_TYPE_S8] = 1, + [MOXART_DMA_DATA_TYPE_S16] = 2, + [MOXART_DMA_DATA_TYPE_S32] = 4, +}; + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} + +static inline struct moxart_chan *to_moxart_dma_chan(struct dma_chan *c) +{ + return container_of(c, struct moxart_chan, vc.chan); +} + +static inline struct moxart_desc *to_moxart_dma_desc( + struct dma_async_tx_descriptor *t) +{ + return container_of(t, struct moxart_desc, vd.tx); +} + +static void moxart_dma_desc_free(struct virt_dma_desc *vd) +{ + kfree(container_of(vd, struct moxart_desc, vd)); +} + +static int moxart_terminate_all(struct dma_chan *chan) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + unsigned long flags; + LIST_HEAD(head); + u32 ctrl; + + dev_dbg(chan2dev(chan), "%s: ch=%p\n", __func__, ch); + + spin_lock_irqsave(&ch->vc.lock, flags); + + if (ch->desc) { + moxart_dma_desc_free(&ch->desc->vd); + ch->desc = NULL; + } + + ctrl = readl(ch->base + REG_OFF_CTRL); + ctrl &= ~(APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN); + writel(ctrl, ch->base + REG_OFF_CTRL); + + vchan_get_all_descriptors(&ch->vc, &head); + spin_unlock_irqrestore(&ch->vc.lock, flags); + vchan_dma_desc_free_list(&ch->vc, &head); + + return 0; +} + +static int moxart_slave_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + u32 ctrl; + + ch->cfg = *cfg; + + ctrl = readl(ch->base + REG_OFF_CTRL); + ctrl |= APB_DMA_BURST_MODE; + ctrl &= ~(APB_DMA_DEST_MASK | APB_DMA_SOURCE_MASK); + ctrl &= ~(APB_DMA_DEST_REQ_NO_MASK | APB_DMA_SOURCE_REQ_NO_MASK); + + switch (ch->cfg.src_addr_width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + ctrl |= APB_DMA_DATA_WIDTH_1; + if (ch->cfg.direction != DMA_MEM_TO_DEV) + ctrl |= APB_DMA_DEST_INC_1_4; + else + ctrl |= APB_DMA_SOURCE_INC_1_4; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + ctrl |= APB_DMA_DATA_WIDTH_2; + if (ch->cfg.direction != DMA_MEM_TO_DEV) + ctrl |= APB_DMA_DEST_INC_2_8; + else + ctrl |= APB_DMA_SOURCE_INC_2_8; + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + ctrl &= ~APB_DMA_DATA_WIDTH; + if (ch->cfg.direction != DMA_MEM_TO_DEV) + ctrl |= APB_DMA_DEST_INC_4_16; + else + ctrl |= APB_DMA_SOURCE_INC_4_16; + break; + default: + return -EINVAL; + } + + if (ch->cfg.direction == DMA_MEM_TO_DEV) { + ctrl &= ~APB_DMA_DEST_SELECT; + ctrl |= APB_DMA_SOURCE_SELECT; + ctrl |= (ch->line_reqno << 16 & + APB_DMA_DEST_REQ_NO_MASK); + } else { + ctrl |= APB_DMA_DEST_SELECT; + ctrl &= ~APB_DMA_SOURCE_SELECT; + ctrl |= (ch->line_reqno << 24 & + APB_DMA_SOURCE_REQ_NO_MASK); + } + + writel(ctrl, ch->base + REG_OFF_CTRL); + + return 0; +} + +static struct dma_async_tx_descriptor *moxart_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction dir, + unsigned long tx_flags, void *context) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + struct moxart_desc *d; + enum dma_slave_buswidth dev_width; + dma_addr_t dev_addr; + struct scatterlist *sgent; + unsigned int es; + unsigned int i; + + if (!is_slave_direction(dir)) { + dev_err(chan2dev(chan), "%s: invalid DMA direction\n", + __func__); + return NULL; + } + + if (dir == DMA_DEV_TO_MEM) { + dev_addr = ch->cfg.src_addr; + dev_width = ch->cfg.src_addr_width; + } else { + dev_addr = ch->cfg.dst_addr; + dev_width = ch->cfg.dst_addr_width; + } + + switch (dev_width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + es = MOXART_DMA_DATA_TYPE_S8; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + es = MOXART_DMA_DATA_TYPE_S16; + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + es = MOXART_DMA_DATA_TYPE_S32; + break; + default: + dev_err(chan2dev(chan), "%s: unsupported data width (%u)\n", + __func__, dev_width); + return NULL; + } + + d = kzalloc(sizeof(*d) + sg_len * sizeof(d->sg[0]), GFP_ATOMIC); + if (!d) + return NULL; + + d->dma_dir = dir; + d->dev_addr = dev_addr; + d->es = es; + + for_each_sg(sgl, sgent, sg_len, i) { + d->sg[i].addr = sg_dma_address(sgent); + d->sg[i].len = sg_dma_len(sgent); + } + + d->sglen = sg_len; + + ch->error = 0; + + return vchan_tx_prep(&ch->vc, &d->vd, tx_flags); +} + +static struct dma_chan *moxart_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct moxart_dmadev *mdc = ofdma->of_dma_data; + struct dma_chan *chan; + struct moxart_chan *ch; + + chan = dma_get_any_slave_channel(&mdc->dma_slave); + if (!chan) + return NULL; + + ch = to_moxart_dma_chan(chan); + ch->line_reqno = dma_spec->args[0]; + + return chan; +} + +static int moxart_alloc_chan_resources(struct dma_chan *chan) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + + dev_dbg(chan2dev(chan), "%s: allocating channel #%u\n", + __func__, ch->ch_num); + ch->allocated = 1; + + return 0; +} + +static void moxart_free_chan_resources(struct dma_chan *chan) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + + vchan_free_chan_resources(&ch->vc); + + dev_dbg(chan2dev(chan), "%s: freeing channel #%u\n", + __func__, ch->ch_num); + ch->allocated = 0; +} + +static void moxart_dma_set_params(struct moxart_chan *ch, dma_addr_t src_addr, + dma_addr_t dst_addr) +{ + writel(src_addr, ch->base + REG_OFF_ADDRESS_SOURCE); + writel(dst_addr, ch->base + REG_OFF_ADDRESS_DEST); +} + +static void moxart_set_transfer_params(struct moxart_chan *ch, unsigned int len) +{ + struct moxart_desc *d = ch->desc; + unsigned int sglen_div = es_bytes[d->es]; + + d->dma_cycles = len >> sglen_div; + + /* + * There are 4 cycles on 64 bytes copied, i.e. one cycle copies 16 + * bytes ( when width is APB_DMAB_DATA_WIDTH_4 ). + */ + writel(d->dma_cycles, ch->base + REG_OFF_CYCLES); + + dev_dbg(chan2dev(&ch->vc.chan), "%s: set %u DMA cycles (len=%u)\n", + __func__, d->dma_cycles, len); +} + +static void moxart_start_dma(struct moxart_chan *ch) +{ + u32 ctrl; + + ctrl = readl(ch->base + REG_OFF_CTRL); + ctrl |= (APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN); + writel(ctrl, ch->base + REG_OFF_CTRL); +} + +static void moxart_dma_start_sg(struct moxart_chan *ch, unsigned int idx) +{ + struct moxart_desc *d = ch->desc; + struct moxart_sg *sg = ch->desc->sg + idx; + + if (ch->desc->dma_dir == DMA_MEM_TO_DEV) + moxart_dma_set_params(ch, sg->addr, d->dev_addr); + else if (ch->desc->dma_dir == DMA_DEV_TO_MEM) + moxart_dma_set_params(ch, d->dev_addr, sg->addr); + + moxart_set_transfer_params(ch, sg->len); + + moxart_start_dma(ch); +} + +static void moxart_dma_start_desc(struct dma_chan *chan) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + struct virt_dma_desc *vd; + + vd = vchan_next_desc(&ch->vc); + + if (!vd) { + ch->desc = NULL; + return; + } + + list_del(&vd->node); + + ch->desc = to_moxart_dma_desc(&vd->tx); + ch->sgidx = 0; + + moxart_dma_start_sg(ch, 0); +} + +static void moxart_issue_pending(struct dma_chan *chan) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&ch->vc.lock, flags); + if (vchan_issue_pending(&ch->vc) && !ch->desc) + moxart_dma_start_desc(chan); + spin_unlock_irqrestore(&ch->vc.lock, flags); +} + +static size_t moxart_dma_desc_size(struct moxart_desc *d, + unsigned int completed_sgs) +{ + unsigned int i; + size_t size; + + for (size = i = completed_sgs; i < d->sglen; i++) + size += d->sg[i].len; + + return size; +} + +static size_t moxart_dma_desc_size_in_flight(struct moxart_chan *ch) +{ + size_t size; + unsigned int completed_cycles, cycles; + + size = moxart_dma_desc_size(ch->desc, ch->sgidx); + cycles = readl(ch->base + REG_OFF_CYCLES); + completed_cycles = (ch->desc->dma_cycles - cycles); + size -= completed_cycles << es_bytes[ch->desc->es]; + + dev_dbg(chan2dev(&ch->vc.chan), "%s: size=%zu\n", __func__, size); + + return size; +} + +static enum dma_status moxart_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct moxart_chan *ch = to_moxart_dma_chan(chan); + struct virt_dma_desc *vd; + struct moxart_desc *d; + enum dma_status ret; + unsigned long flags; + + /* + * dma_cookie_status() assigns initial residue value. + */ + ret = dma_cookie_status(chan, cookie, txstate); + + spin_lock_irqsave(&ch->vc.lock, flags); + vd = vchan_find_desc(&ch->vc, cookie); + if (vd) { + d = to_moxart_dma_desc(&vd->tx); + txstate->residue = moxart_dma_desc_size(d, 0); + } else if (ch->desc && ch->desc->vd.tx.cookie == cookie) { + txstate->residue = moxart_dma_desc_size_in_flight(ch); + } + spin_unlock_irqrestore(&ch->vc.lock, flags); + + if (ch->error) + return DMA_ERROR; + + return ret; +} + +static void moxart_dma_init(struct dma_device *dma, struct device *dev) +{ + dma->device_prep_slave_sg = moxart_prep_slave_sg; + dma->device_alloc_chan_resources = moxart_alloc_chan_resources; + dma->device_free_chan_resources = moxart_free_chan_resources; + dma->device_issue_pending = moxart_issue_pending; + dma->device_tx_status = moxart_tx_status; + dma->device_config = moxart_slave_config; + dma->device_terminate_all = moxart_terminate_all; + dma->dev = dev; + + INIT_LIST_HEAD(&dma->channels); +} + +static irqreturn_t moxart_dma_interrupt(int irq, void *devid) +{ + struct moxart_dmadev *mc = devid; + struct moxart_chan *ch = &mc->slave_chans[0]; + unsigned int i; + unsigned long flags; + u32 ctrl; + + dev_dbg(chan2dev(&ch->vc.chan), "%s\n", __func__); + + for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) { + if (!ch->allocated) + continue; + + ctrl = readl(ch->base + REG_OFF_CTRL); + + dev_dbg(chan2dev(&ch->vc.chan), "%s: ch=%p ch->base=%p ctrl=%x\n", + __func__, ch, ch->base, ctrl); + + if (ctrl & APB_DMA_FIN_INT_STS) { + ctrl &= ~APB_DMA_FIN_INT_STS; + if (ch->desc) { + spin_lock_irqsave(&ch->vc.lock, flags); + if (++ch->sgidx < ch->desc->sglen) { + moxart_dma_start_sg(ch, ch->sgidx); + } else { + vchan_cookie_complete(&ch->desc->vd); + moxart_dma_start_desc(&ch->vc.chan); + } + spin_unlock_irqrestore(&ch->vc.lock, flags); + } + } + + if (ctrl & APB_DMA_ERR_INT_STS) { + ctrl &= ~APB_DMA_ERR_INT_STS; + ch->error = 1; + } + + writel(ctrl, ch->base + REG_OFF_CTRL); + } + + return IRQ_HANDLED; +} + +static int moxart_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *node = dev->of_node; + struct resource *res; + static void __iomem *dma_base_addr; + int ret, i; + unsigned int irq; + struct moxart_chan *ch; + struct moxart_dmadev *mdc; + + mdc = devm_kzalloc(dev, sizeof(*mdc), GFP_KERNEL); + if (!mdc) { + dev_err(dev, "can't allocate DMA container\n"); + return -ENOMEM; + } + + irq = irq_of_parse_and_map(node, 0); + if (irq == NO_IRQ) { + dev_err(dev, "no IRQ resource\n"); + return -EINVAL; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dma_base_addr = devm_ioremap_resource(dev, res); + if (IS_ERR(dma_base_addr)) + return PTR_ERR(dma_base_addr); + + dma_cap_zero(mdc->dma_slave.cap_mask); + dma_cap_set(DMA_SLAVE, mdc->dma_slave.cap_mask); + dma_cap_set(DMA_PRIVATE, mdc->dma_slave.cap_mask); + + moxart_dma_init(&mdc->dma_slave, dev); + + ch = &mdc->slave_chans[0]; + for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) { + ch->ch_num = i; + ch->base = dma_base_addr + i * REG_OFF_CHAN_SIZE; + ch->allocated = 0; + + ch->vc.desc_free = moxart_dma_desc_free; + vchan_init(&ch->vc, &mdc->dma_slave); + + dev_dbg(dev, "%s: chs[%d]: ch->ch_num=%u ch->base=%p\n", + __func__, i, ch->ch_num, ch->base); + } + + platform_set_drvdata(pdev, mdc); + + ret = devm_request_irq(dev, irq, moxart_dma_interrupt, 0, + "moxart-dma-engine", mdc); + if (ret) { + dev_err(dev, "devm_request_irq failed\n"); + return ret; + } + + ret = dma_async_device_register(&mdc->dma_slave); + if (ret) { + dev_err(dev, "dma_async_device_register failed\n"); + return ret; + } + + ret = of_dma_controller_register(node, moxart_of_xlate, mdc); + if (ret) { + dev_err(dev, "of_dma_controller_register failed\n"); + dma_async_device_unregister(&mdc->dma_slave); + return ret; + } + + dev_dbg(dev, "%s: IRQ=%u\n", __func__, irq); + + return 0; +} + +static int moxart_remove(struct platform_device *pdev) +{ + struct moxart_dmadev *m = platform_get_drvdata(pdev); + + dma_async_device_unregister(&m->dma_slave); + + if (pdev->dev.of_node) + of_dma_controller_free(pdev->dev.of_node); + + return 0; +} + +static const struct of_device_id moxart_dma_match[] = { + { .compatible = "moxa,moxart-dma" }, + { } +}; + +static struct platform_driver moxart_driver = { + .probe = moxart_probe, + .remove = moxart_remove, + .driver = { + .name = "moxart-dma-engine", + .of_match_table = moxart_dma_match, + }, +}; + +static int moxart_init(void) +{ + return platform_driver_register(&moxart_driver); +} +subsys_initcall(moxart_init); + +static void __exit moxart_exit(void) +{ + platform_driver_unregister(&moxart_driver); +} +module_exit(moxart_exit); + +MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>"); +MODULE_DESCRIPTION("MOXART DMA engine driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/mpc512x_dma.c b/drivers/dma/mpc512x_dma.c new file mode 100644 index 000000000..e6281e7aa --- /dev/null +++ b/drivers/dma/mpc512x_dma.c @@ -0,0 +1,1089 @@ +/* + * Copyright (C) Freescale Semicondutor, Inc. 2007, 2008. + * Copyright (C) Semihalf 2009 + * Copyright (C) Ilya Yanok, Emcraft Systems 2010 + * Copyright (C) Alexander Popov, Promcontroller 2014 + * + * Written by Piotr Ziecik <kosmo@semihalf.com>. Hardware description + * (defines, structures and comments) was taken from MPC5121 DMA driver + * written by Hongjun Chen <hong-jun.chen@freescale.com>. + * + * Approved as OSADL project by a majority of OSADL members and funded + * by OSADL membership fees in 2009; for details see www.osadl.org. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ + +/* + * MPC512x and MPC8308 DMA driver. It supports + * memory to memory data transfers (tested using dmatest module) and + * data transfers between memory and peripheral I/O memory + * by means of slave scatter/gather with these limitations: + * - chunked transfers (described by s/g lists with more than one item) + * are refused as long as proper support for scatter/gather is missing; + * - transfers on MPC8308 always start from software as this SoC appears + * not to have external request lines for peripheral flow control; + * - only peripheral devices with 4-byte FIFO access register are supported; + * - minimal memory <-> I/O memory transfer chunk is 4 bytes and consequently + * source and destination addresses must be 4-byte aligned + * and transfer size must be aligned on (4 * maxburst) boundary; + */ + +#include <linux/module.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_irq.h> +#include <linux/of_dma.h> +#include <linux/of_platform.h> + +#include <linux/random.h> + +#include "dmaengine.h" + +/* Number of DMA Transfer descriptors allocated per channel */ +#define MPC_DMA_DESCRIPTORS 64 + +/* Macro definitions */ +#define MPC_DMA_TCD_OFFSET 0x1000 + +/* + * Maximum channel counts for individual hardware variants + * and the maximum channel count over all supported controllers, + * used for data structure size + */ +#define MPC8308_DMACHAN_MAX 16 +#define MPC512x_DMACHAN_MAX 64 +#define MPC_DMA_CHANNELS 64 + +/* Arbitration mode of group and channel */ +#define MPC_DMA_DMACR_EDCG (1 << 31) +#define MPC_DMA_DMACR_ERGA (1 << 3) +#define MPC_DMA_DMACR_ERCA (1 << 2) + +/* Error codes */ +#define MPC_DMA_DMAES_VLD (1 << 31) +#define MPC_DMA_DMAES_GPE (1 << 15) +#define MPC_DMA_DMAES_CPE (1 << 14) +#define MPC_DMA_DMAES_ERRCHN(err) \ + (((err) >> 8) & 0x3f) +#define MPC_DMA_DMAES_SAE (1 << 7) +#define MPC_DMA_DMAES_SOE (1 << 6) +#define MPC_DMA_DMAES_DAE (1 << 5) +#define MPC_DMA_DMAES_DOE (1 << 4) +#define MPC_DMA_DMAES_NCE (1 << 3) +#define MPC_DMA_DMAES_SGE (1 << 2) +#define MPC_DMA_DMAES_SBE (1 << 1) +#define MPC_DMA_DMAES_DBE (1 << 0) + +#define MPC_DMA_DMAGPOR_SNOOP_ENABLE (1 << 6) + +#define MPC_DMA_TSIZE_1 0x00 +#define MPC_DMA_TSIZE_2 0x01 +#define MPC_DMA_TSIZE_4 0x02 +#define MPC_DMA_TSIZE_16 0x04 +#define MPC_DMA_TSIZE_32 0x05 + +/* MPC5121 DMA engine registers */ +struct __attribute__ ((__packed__)) mpc_dma_regs { + /* 0x00 */ + u32 dmacr; /* DMA control register */ + u32 dmaes; /* DMA error status */ + /* 0x08 */ + u32 dmaerqh; /* DMA enable request high(channels 63~32) */ + u32 dmaerql; /* DMA enable request low(channels 31~0) */ + u32 dmaeeih; /* DMA enable error interrupt high(ch63~32) */ + u32 dmaeeil; /* DMA enable error interrupt low(ch31~0) */ + /* 0x18 */ + u8 dmaserq; /* DMA set enable request */ + u8 dmacerq; /* DMA clear enable request */ + u8 dmaseei; /* DMA set enable error interrupt */ + u8 dmaceei; /* DMA clear enable error interrupt */ + /* 0x1c */ + u8 dmacint; /* DMA clear interrupt request */ + u8 dmacerr; /* DMA clear error */ + u8 dmassrt; /* DMA set start bit */ + u8 dmacdne; /* DMA clear DONE status bit */ + /* 0x20 */ + u32 dmainth; /* DMA interrupt request high(ch63~32) */ + u32 dmaintl; /* DMA interrupt request low(ch31~0) */ + u32 dmaerrh; /* DMA error high(ch63~32) */ + u32 dmaerrl; /* DMA error low(ch31~0) */ + /* 0x30 */ + u32 dmahrsh; /* DMA hw request status high(ch63~32) */ + u32 dmahrsl; /* DMA hardware request status low(ch31~0) */ + union { + u32 dmaihsa; /* DMA interrupt high select AXE(ch63~32) */ + u32 dmagpor; /* (General purpose register on MPC8308) */ + }; + u32 dmailsa; /* DMA interrupt low select AXE(ch31~0) */ + /* 0x40 ~ 0xff */ + u32 reserve0[48]; /* Reserved */ + /* 0x100 */ + u8 dchpri[MPC_DMA_CHANNELS]; + /* DMA channels(0~63) priority */ +}; + +struct __attribute__ ((__packed__)) mpc_dma_tcd { + /* 0x00 */ + u32 saddr; /* Source address */ + + u32 smod:5; /* Source address modulo */ + u32 ssize:3; /* Source data transfer size */ + u32 dmod:5; /* Destination address modulo */ + u32 dsize:3; /* Destination data transfer size */ + u32 soff:16; /* Signed source address offset */ + + /* 0x08 */ + u32 nbytes; /* Inner "minor" byte count */ + u32 slast; /* Last source address adjustment */ + u32 daddr; /* Destination address */ + + /* 0x14 */ + u32 citer_elink:1; /* Enable channel-to-channel linking on + * minor loop complete + */ + u32 citer_linkch:6; /* Link channel for minor loop complete */ + u32 citer:9; /* Current "major" iteration count */ + u32 doff:16; /* Signed destination address offset */ + + /* 0x18 */ + u32 dlast_sga; /* Last Destination address adjustment/scatter + * gather address + */ + + /* 0x1c */ + u32 biter_elink:1; /* Enable channel-to-channel linking on major + * loop complete + */ + u32 biter_linkch:6; + u32 biter:9; /* Beginning "major" iteration count */ + u32 bwc:2; /* Bandwidth control */ + u32 major_linkch:6; /* Link channel number */ + u32 done:1; /* Channel done */ + u32 active:1; /* Channel active */ + u32 major_elink:1; /* Enable channel-to-channel linking on major + * loop complete + */ + u32 e_sg:1; /* Enable scatter/gather processing */ + u32 d_req:1; /* Disable request */ + u32 int_half:1; /* Enable an interrupt when major counter is + * half complete + */ + u32 int_maj:1; /* Enable an interrupt when major iteration + * count completes + */ + u32 start:1; /* Channel start */ +}; + +struct mpc_dma_desc { + struct dma_async_tx_descriptor desc; + struct mpc_dma_tcd *tcd; + dma_addr_t tcd_paddr; + int error; + struct list_head node; + int will_access_peripheral; +}; + +struct mpc_dma_chan { + struct dma_chan chan; + struct list_head free; + struct list_head prepared; + struct list_head queued; + struct list_head active; + struct list_head completed; + struct mpc_dma_tcd *tcd; + dma_addr_t tcd_paddr; + + /* Settings for access to peripheral FIFO */ + dma_addr_t src_per_paddr; + u32 src_tcd_nunits; + dma_addr_t dst_per_paddr; + u32 dst_tcd_nunits; + + /* Lock for this structure */ + spinlock_t lock; +}; + +struct mpc_dma { + struct dma_device dma; + struct tasklet_struct tasklet; + struct mpc_dma_chan channels[MPC_DMA_CHANNELS]; + struct mpc_dma_regs __iomem *regs; + struct mpc_dma_tcd __iomem *tcd; + int irq; + int irq2; + uint error_status; + int is_mpc8308; + + /* Lock for error_status field in this structure */ + spinlock_t error_status_lock; +}; + +#define DRV_NAME "mpc512x_dma" + +/* Convert struct dma_chan to struct mpc_dma_chan */ +static inline struct mpc_dma_chan *dma_chan_to_mpc_dma_chan(struct dma_chan *c) +{ + return container_of(c, struct mpc_dma_chan, chan); +} + +/* Convert struct dma_chan to struct mpc_dma */ +static inline struct mpc_dma *dma_chan_to_mpc_dma(struct dma_chan *c) +{ + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(c); + return container_of(mchan, struct mpc_dma, channels[c->chan_id]); +} + +/* + * Execute all queued DMA descriptors. + * + * Following requirements must be met while calling mpc_dma_execute(): + * a) mchan->lock is acquired, + * b) mchan->active list is empty, + * c) mchan->queued list contains at least one entry. + */ +static void mpc_dma_execute(struct mpc_dma_chan *mchan) +{ + struct mpc_dma *mdma = dma_chan_to_mpc_dma(&mchan->chan); + struct mpc_dma_desc *first = NULL; + struct mpc_dma_desc *prev = NULL; + struct mpc_dma_desc *mdesc; + int cid = mchan->chan.chan_id; + + while (!list_empty(&mchan->queued)) { + mdesc = list_first_entry(&mchan->queued, + struct mpc_dma_desc, node); + /* + * Grab either several mem-to-mem transfer descriptors + * or one peripheral transfer descriptor, + * don't mix mem-to-mem and peripheral transfer descriptors + * within the same 'active' list. + */ + if (mdesc->will_access_peripheral) { + if (list_empty(&mchan->active)) + list_move_tail(&mdesc->node, &mchan->active); + break; + } else { + list_move_tail(&mdesc->node, &mchan->active); + } + } + + /* Chain descriptors into one transaction */ + list_for_each_entry(mdesc, &mchan->active, node) { + if (!first) + first = mdesc; + + if (!prev) { + prev = mdesc; + continue; + } + + prev->tcd->dlast_sga = mdesc->tcd_paddr; + prev->tcd->e_sg = 1; + mdesc->tcd->start = 1; + + prev = mdesc; + } + + prev->tcd->int_maj = 1; + + /* Send first descriptor in chain into hardware */ + memcpy_toio(&mdma->tcd[cid], first->tcd, sizeof(struct mpc_dma_tcd)); + + if (first != prev) + mdma->tcd[cid].e_sg = 1; + + if (mdma->is_mpc8308) { + /* MPC8308, no request lines, software initiated start */ + out_8(&mdma->regs->dmassrt, cid); + } else if (first->will_access_peripheral) { + /* Peripherals involved, start by external request signal */ + out_8(&mdma->regs->dmaserq, cid); + } else { + /* Memory to memory transfer, software initiated start */ + out_8(&mdma->regs->dmassrt, cid); + } +} + +/* Handle interrupt on one half of DMA controller (32 channels) */ +static void mpc_dma_irq_process(struct mpc_dma *mdma, u32 is, u32 es, int off) +{ + struct mpc_dma_chan *mchan; + struct mpc_dma_desc *mdesc; + u32 status = is | es; + int ch; + + while ((ch = fls(status) - 1) >= 0) { + status &= ~(1 << ch); + mchan = &mdma->channels[ch + off]; + + spin_lock(&mchan->lock); + + out_8(&mdma->regs->dmacint, ch + off); + out_8(&mdma->regs->dmacerr, ch + off); + + /* Check error status */ + if (es & (1 << ch)) + list_for_each_entry(mdesc, &mchan->active, node) + mdesc->error = -EIO; + + /* Execute queued descriptors */ + list_splice_tail_init(&mchan->active, &mchan->completed); + if (!list_empty(&mchan->queued)) + mpc_dma_execute(mchan); + + spin_unlock(&mchan->lock); + } +} + +/* Interrupt handler */ +static irqreturn_t mpc_dma_irq(int irq, void *data) +{ + struct mpc_dma *mdma = data; + uint es; + + /* Save error status register */ + es = in_be32(&mdma->regs->dmaes); + spin_lock(&mdma->error_status_lock); + if ((es & MPC_DMA_DMAES_VLD) && mdma->error_status == 0) + mdma->error_status = es; + spin_unlock(&mdma->error_status_lock); + + /* Handle interrupt on each channel */ + if (mdma->dma.chancnt > 32) { + mpc_dma_irq_process(mdma, in_be32(&mdma->regs->dmainth), + in_be32(&mdma->regs->dmaerrh), 32); + } + mpc_dma_irq_process(mdma, in_be32(&mdma->regs->dmaintl), + in_be32(&mdma->regs->dmaerrl), 0); + + /* Schedule tasklet */ + tasklet_schedule(&mdma->tasklet); + + return IRQ_HANDLED; +} + +/* process completed descriptors */ +static void mpc_dma_process_completed(struct mpc_dma *mdma) +{ + dma_cookie_t last_cookie = 0; + struct mpc_dma_chan *mchan; + struct mpc_dma_desc *mdesc; + struct dma_async_tx_descriptor *desc; + unsigned long flags; + LIST_HEAD(list); + int i; + + for (i = 0; i < mdma->dma.chancnt; i++) { + mchan = &mdma->channels[i]; + + /* Get all completed descriptors */ + spin_lock_irqsave(&mchan->lock, flags); + if (!list_empty(&mchan->completed)) + list_splice_tail_init(&mchan->completed, &list); + spin_unlock_irqrestore(&mchan->lock, flags); + + if (list_empty(&list)) + continue; + + /* Execute callbacks and run dependencies */ + list_for_each_entry(mdesc, &list, node) { + desc = &mdesc->desc; + + if (desc->callback) + desc->callback(desc->callback_param); + + last_cookie = desc->cookie; + dma_run_dependencies(desc); + } + + /* Free descriptors */ + spin_lock_irqsave(&mchan->lock, flags); + list_splice_tail_init(&list, &mchan->free); + mchan->chan.completed_cookie = last_cookie; + spin_unlock_irqrestore(&mchan->lock, flags); + } +} + +/* DMA Tasklet */ +static void mpc_dma_tasklet(unsigned long data) +{ + struct mpc_dma *mdma = (void *)data; + unsigned long flags; + uint es; + + spin_lock_irqsave(&mdma->error_status_lock, flags); + es = mdma->error_status; + mdma->error_status = 0; + spin_unlock_irqrestore(&mdma->error_status_lock, flags); + + /* Print nice error report */ + if (es) { + dev_err(mdma->dma.dev, + "Hardware reported following error(s) on channel %u:\n", + MPC_DMA_DMAES_ERRCHN(es)); + + if (es & MPC_DMA_DMAES_GPE) + dev_err(mdma->dma.dev, "- Group Priority Error\n"); + if (es & MPC_DMA_DMAES_CPE) + dev_err(mdma->dma.dev, "- Channel Priority Error\n"); + if (es & MPC_DMA_DMAES_SAE) + dev_err(mdma->dma.dev, "- Source Address Error\n"); + if (es & MPC_DMA_DMAES_SOE) + dev_err(mdma->dma.dev, "- Source Offset" + " Configuration Error\n"); + if (es & MPC_DMA_DMAES_DAE) + dev_err(mdma->dma.dev, "- Destination Address" + " Error\n"); + if (es & MPC_DMA_DMAES_DOE) + dev_err(mdma->dma.dev, "- Destination Offset" + " Configuration Error\n"); + if (es & MPC_DMA_DMAES_NCE) + dev_err(mdma->dma.dev, "- NBytes/Citter" + " Configuration Error\n"); + if (es & MPC_DMA_DMAES_SGE) + dev_err(mdma->dma.dev, "- Scatter/Gather" + " Configuration Error\n"); + if (es & MPC_DMA_DMAES_SBE) + dev_err(mdma->dma.dev, "- Source Bus Error\n"); + if (es & MPC_DMA_DMAES_DBE) + dev_err(mdma->dma.dev, "- Destination Bus Error\n"); + } + + mpc_dma_process_completed(mdma); +} + +/* Submit descriptor to hardware */ +static dma_cookie_t mpc_dma_tx_submit(struct dma_async_tx_descriptor *txd) +{ + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(txd->chan); + struct mpc_dma_desc *mdesc; + unsigned long flags; + dma_cookie_t cookie; + + mdesc = container_of(txd, struct mpc_dma_desc, desc); + + spin_lock_irqsave(&mchan->lock, flags); + + /* Move descriptor to queue */ + list_move_tail(&mdesc->node, &mchan->queued); + + /* If channel is idle, execute all queued descriptors */ + if (list_empty(&mchan->active)) + mpc_dma_execute(mchan); + + /* Update cookie */ + cookie = dma_cookie_assign(txd); + spin_unlock_irqrestore(&mchan->lock, flags); + + return cookie; +} + +/* Alloc channel resources */ +static int mpc_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan); + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan); + struct mpc_dma_desc *mdesc; + struct mpc_dma_tcd *tcd; + dma_addr_t tcd_paddr; + unsigned long flags; + LIST_HEAD(descs); + int i; + + /* Alloc DMA memory for Transfer Control Descriptors */ + tcd = dma_alloc_coherent(mdma->dma.dev, + MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd), + &tcd_paddr, GFP_KERNEL); + if (!tcd) + return -ENOMEM; + + /* Alloc descriptors for this channel */ + for (i = 0; i < MPC_DMA_DESCRIPTORS; i++) { + mdesc = kzalloc(sizeof(struct mpc_dma_desc), GFP_KERNEL); + if (!mdesc) { + dev_notice(mdma->dma.dev, "Memory allocation error. " + "Allocated only %u descriptors\n", i); + break; + } + + dma_async_tx_descriptor_init(&mdesc->desc, chan); + mdesc->desc.flags = DMA_CTRL_ACK; + mdesc->desc.tx_submit = mpc_dma_tx_submit; + + mdesc->tcd = &tcd[i]; + mdesc->tcd_paddr = tcd_paddr + (i * sizeof(struct mpc_dma_tcd)); + + list_add_tail(&mdesc->node, &descs); + } + + /* Return error only if no descriptors were allocated */ + if (i == 0) { + dma_free_coherent(mdma->dma.dev, + MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd), + tcd, tcd_paddr); + return -ENOMEM; + } + + spin_lock_irqsave(&mchan->lock, flags); + mchan->tcd = tcd; + mchan->tcd_paddr = tcd_paddr; + list_splice_tail_init(&descs, &mchan->free); + spin_unlock_irqrestore(&mchan->lock, flags); + + /* Enable Error Interrupt */ + out_8(&mdma->regs->dmaseei, chan->chan_id); + + return 0; +} + +/* Free channel resources */ +static void mpc_dma_free_chan_resources(struct dma_chan *chan) +{ + struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan); + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan); + struct mpc_dma_desc *mdesc, *tmp; + struct mpc_dma_tcd *tcd; + dma_addr_t tcd_paddr; + unsigned long flags; + LIST_HEAD(descs); + + spin_lock_irqsave(&mchan->lock, flags); + + /* Channel must be idle */ + BUG_ON(!list_empty(&mchan->prepared)); + BUG_ON(!list_empty(&mchan->queued)); + BUG_ON(!list_empty(&mchan->active)); + BUG_ON(!list_empty(&mchan->completed)); + + /* Move data */ + list_splice_tail_init(&mchan->free, &descs); + tcd = mchan->tcd; + tcd_paddr = mchan->tcd_paddr; + + spin_unlock_irqrestore(&mchan->lock, flags); + + /* Free DMA memory used by descriptors */ + dma_free_coherent(mdma->dma.dev, + MPC_DMA_DESCRIPTORS * sizeof(struct mpc_dma_tcd), + tcd, tcd_paddr); + + /* Free descriptors */ + list_for_each_entry_safe(mdesc, tmp, &descs, node) + kfree(mdesc); + + /* Disable Error Interrupt */ + out_8(&mdma->regs->dmaceei, chan->chan_id); +} + +/* Send all pending descriptor to hardware */ +static void mpc_dma_issue_pending(struct dma_chan *chan) +{ + /* + * We are posting descriptors to the hardware as soon as + * they are ready, so this function does nothing. + */ +} + +/* Check request completion status */ +static enum dma_status +mpc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + return dma_cookie_status(chan, cookie, txstate); +} + +/* Prepare descriptor for memory to memory copy */ +static struct dma_async_tx_descriptor * +mpc_dma_prep_memcpy(struct dma_chan *chan, dma_addr_t dst, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan); + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan); + struct mpc_dma_desc *mdesc = NULL; + struct mpc_dma_tcd *tcd; + unsigned long iflags; + + /* Get free descriptor */ + spin_lock_irqsave(&mchan->lock, iflags); + if (!list_empty(&mchan->free)) { + mdesc = list_first_entry(&mchan->free, struct mpc_dma_desc, + node); + list_del(&mdesc->node); + } + spin_unlock_irqrestore(&mchan->lock, iflags); + + if (!mdesc) { + /* try to free completed descriptors */ + mpc_dma_process_completed(mdma); + return NULL; + } + + mdesc->error = 0; + mdesc->will_access_peripheral = 0; + tcd = mdesc->tcd; + + /* Prepare Transfer Control Descriptor for this transaction */ + memset(tcd, 0, sizeof(struct mpc_dma_tcd)); + + if (IS_ALIGNED(src | dst | len, 32)) { + tcd->ssize = MPC_DMA_TSIZE_32; + tcd->dsize = MPC_DMA_TSIZE_32; + tcd->soff = 32; + tcd->doff = 32; + } else if (!mdma->is_mpc8308 && IS_ALIGNED(src | dst | len, 16)) { + /* MPC8308 doesn't support 16 byte transfers */ + tcd->ssize = MPC_DMA_TSIZE_16; + tcd->dsize = MPC_DMA_TSIZE_16; + tcd->soff = 16; + tcd->doff = 16; + } else if (IS_ALIGNED(src | dst | len, 4)) { + tcd->ssize = MPC_DMA_TSIZE_4; + tcd->dsize = MPC_DMA_TSIZE_4; + tcd->soff = 4; + tcd->doff = 4; + } else if (IS_ALIGNED(src | dst | len, 2)) { + tcd->ssize = MPC_DMA_TSIZE_2; + tcd->dsize = MPC_DMA_TSIZE_2; + tcd->soff = 2; + tcd->doff = 2; + } else { + tcd->ssize = MPC_DMA_TSIZE_1; + tcd->dsize = MPC_DMA_TSIZE_1; + tcd->soff = 1; + tcd->doff = 1; + } + + tcd->saddr = src; + tcd->daddr = dst; + tcd->nbytes = len; + tcd->biter = 1; + tcd->citer = 1; + + /* Place descriptor in prepared list */ + spin_lock_irqsave(&mchan->lock, iflags); + list_add_tail(&mdesc->node, &mchan->prepared); + spin_unlock_irqrestore(&mchan->lock, iflags); + + return &mdesc->desc; +} + +static struct dma_async_tx_descriptor * +mpc_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan); + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan); + struct mpc_dma_desc *mdesc = NULL; + dma_addr_t per_paddr; + u32 tcd_nunits; + struct mpc_dma_tcd *tcd; + unsigned long iflags; + struct scatterlist *sg; + size_t len; + int iter, i; + + /* Currently there is no proper support for scatter/gather */ + if (sg_len != 1) + return NULL; + + if (!is_slave_direction(direction)) + return NULL; + + for_each_sg(sgl, sg, sg_len, i) { + spin_lock_irqsave(&mchan->lock, iflags); + + mdesc = list_first_entry(&mchan->free, + struct mpc_dma_desc, node); + if (!mdesc) { + spin_unlock_irqrestore(&mchan->lock, iflags); + /* Try to free completed descriptors */ + mpc_dma_process_completed(mdma); + return NULL; + } + + list_del(&mdesc->node); + + if (direction == DMA_DEV_TO_MEM) { + per_paddr = mchan->src_per_paddr; + tcd_nunits = mchan->src_tcd_nunits; + } else { + per_paddr = mchan->dst_per_paddr; + tcd_nunits = mchan->dst_tcd_nunits; + } + + spin_unlock_irqrestore(&mchan->lock, iflags); + + if (per_paddr == 0 || tcd_nunits == 0) + goto err_prep; + + mdesc->error = 0; + mdesc->will_access_peripheral = 1; + + /* Prepare Transfer Control Descriptor for this transaction */ + tcd = mdesc->tcd; + + memset(tcd, 0, sizeof(struct mpc_dma_tcd)); + + if (!IS_ALIGNED(sg_dma_address(sg), 4)) + goto err_prep; + + if (direction == DMA_DEV_TO_MEM) { + tcd->saddr = per_paddr; + tcd->daddr = sg_dma_address(sg); + tcd->soff = 0; + tcd->doff = 4; + } else { + tcd->saddr = sg_dma_address(sg); + tcd->daddr = per_paddr; + tcd->soff = 4; + tcd->doff = 0; + } + + tcd->ssize = MPC_DMA_TSIZE_4; + tcd->dsize = MPC_DMA_TSIZE_4; + + len = sg_dma_len(sg); + tcd->nbytes = tcd_nunits * 4; + if (!IS_ALIGNED(len, tcd->nbytes)) + goto err_prep; + + iter = len / tcd->nbytes; + if (iter >= 1 << 15) { + /* len is too big */ + goto err_prep; + } + /* citer_linkch contains the high bits of iter */ + tcd->biter = iter & 0x1ff; + tcd->biter_linkch = iter >> 9; + tcd->citer = tcd->biter; + tcd->citer_linkch = tcd->biter_linkch; + + tcd->e_sg = 0; + tcd->d_req = 1; + + /* Place descriptor in prepared list */ + spin_lock_irqsave(&mchan->lock, iflags); + list_add_tail(&mdesc->node, &mchan->prepared); + spin_unlock_irqrestore(&mchan->lock, iflags); + } + + return &mdesc->desc; + +err_prep: + /* Put the descriptor back */ + spin_lock_irqsave(&mchan->lock, iflags); + list_add_tail(&mdesc->node, &mchan->free); + spin_unlock_irqrestore(&mchan->lock, iflags); + + return NULL; +} + +static int mpc_dma_device_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan); + unsigned long flags; + + /* + * Software constraints: + * - only transfers between a peripheral device and + * memory are supported; + * - only peripheral devices with 4-byte FIFO access register + * are supported; + * - minimal transfer chunk is 4 bytes and consequently + * source and destination addresses must be 4-byte aligned + * and transfer size must be aligned on (4 * maxburst) + * boundary; + * - during the transfer RAM address is being incremented by + * the size of minimal transfer chunk; + * - peripheral port's address is constant during the transfer. + */ + + if (cfg->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES || + cfg->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES || + !IS_ALIGNED(cfg->src_addr, 4) || + !IS_ALIGNED(cfg->dst_addr, 4)) { + return -EINVAL; + } + + spin_lock_irqsave(&mchan->lock, flags); + + mchan->src_per_paddr = cfg->src_addr; + mchan->src_tcd_nunits = cfg->src_maxburst; + mchan->dst_per_paddr = cfg->dst_addr; + mchan->dst_tcd_nunits = cfg->dst_maxburst; + + /* Apply defaults */ + if (mchan->src_tcd_nunits == 0) + mchan->src_tcd_nunits = 1; + if (mchan->dst_tcd_nunits == 0) + mchan->dst_tcd_nunits = 1; + + spin_unlock_irqrestore(&mchan->lock, flags); + + return 0; +} + +static int mpc_dma_device_terminate_all(struct dma_chan *chan) +{ + struct mpc_dma_chan *mchan = dma_chan_to_mpc_dma_chan(chan); + struct mpc_dma *mdma = dma_chan_to_mpc_dma(chan); + unsigned long flags; + + /* Disable channel requests */ + spin_lock_irqsave(&mchan->lock, flags); + + out_8(&mdma->regs->dmacerq, chan->chan_id); + list_splice_tail_init(&mchan->prepared, &mchan->free); + list_splice_tail_init(&mchan->queued, &mchan->free); + list_splice_tail_init(&mchan->active, &mchan->free); + + spin_unlock_irqrestore(&mchan->lock, flags); + + return 0; +} + +static int mpc_dma_probe(struct platform_device *op) +{ + struct device_node *dn = op->dev.of_node; + struct device *dev = &op->dev; + struct dma_device *dma; + struct mpc_dma *mdma; + struct mpc_dma_chan *mchan; + struct resource res; + ulong regs_start, regs_size; + int retval, i; + u8 chancnt; + + mdma = devm_kzalloc(dev, sizeof(struct mpc_dma), GFP_KERNEL); + if (!mdma) { + dev_err(dev, "Memory exhausted!\n"); + retval = -ENOMEM; + goto err; + } + + mdma->irq = irq_of_parse_and_map(dn, 0); + if (mdma->irq == NO_IRQ) { + dev_err(dev, "Error mapping IRQ!\n"); + retval = -EINVAL; + goto err; + } + + if (of_device_is_compatible(dn, "fsl,mpc8308-dma")) { + mdma->is_mpc8308 = 1; + mdma->irq2 = irq_of_parse_and_map(dn, 1); + if (mdma->irq2 == NO_IRQ) { + dev_err(dev, "Error mapping IRQ!\n"); + retval = -EINVAL; + goto err_dispose1; + } + } + + retval = of_address_to_resource(dn, 0, &res); + if (retval) { + dev_err(dev, "Error parsing memory region!\n"); + goto err_dispose2; + } + + regs_start = res.start; + regs_size = resource_size(&res); + + if (!devm_request_mem_region(dev, regs_start, regs_size, DRV_NAME)) { + dev_err(dev, "Error requesting memory region!\n"); + retval = -EBUSY; + goto err_dispose2; + } + + mdma->regs = devm_ioremap(dev, regs_start, regs_size); + if (!mdma->regs) { + dev_err(dev, "Error mapping memory region!\n"); + retval = -ENOMEM; + goto err_dispose2; + } + + mdma->tcd = (struct mpc_dma_tcd *)((u8 *)(mdma->regs) + + MPC_DMA_TCD_OFFSET); + + retval = request_irq(mdma->irq, &mpc_dma_irq, 0, DRV_NAME, mdma); + if (retval) { + dev_err(dev, "Error requesting IRQ!\n"); + retval = -EINVAL; + goto err_dispose2; + } + + if (mdma->is_mpc8308) { + retval = request_irq(mdma->irq2, &mpc_dma_irq, 0, + DRV_NAME, mdma); + if (retval) { + dev_err(dev, "Error requesting IRQ2!\n"); + retval = -EINVAL; + goto err_free1; + } + } + + spin_lock_init(&mdma->error_status_lock); + + dma = &mdma->dma; + dma->dev = dev; + dma->device_alloc_chan_resources = mpc_dma_alloc_chan_resources; + dma->device_free_chan_resources = mpc_dma_free_chan_resources; + dma->device_issue_pending = mpc_dma_issue_pending; + dma->device_tx_status = mpc_dma_tx_status; + dma->device_prep_dma_memcpy = mpc_dma_prep_memcpy; + dma->device_prep_slave_sg = mpc_dma_prep_slave_sg; + dma->device_config = mpc_dma_device_config; + dma->device_terminate_all = mpc_dma_device_terminate_all; + + INIT_LIST_HEAD(&dma->channels); + dma_cap_set(DMA_MEMCPY, dma->cap_mask); + dma_cap_set(DMA_SLAVE, dma->cap_mask); + + if (mdma->is_mpc8308) + chancnt = MPC8308_DMACHAN_MAX; + else + chancnt = MPC512x_DMACHAN_MAX; + + for (i = 0; i < chancnt; i++) { + mchan = &mdma->channels[i]; + + mchan->chan.device = dma; + dma_cookie_init(&mchan->chan); + + INIT_LIST_HEAD(&mchan->free); + INIT_LIST_HEAD(&mchan->prepared); + INIT_LIST_HEAD(&mchan->queued); + INIT_LIST_HEAD(&mchan->active); + INIT_LIST_HEAD(&mchan->completed); + + spin_lock_init(&mchan->lock); + list_add_tail(&mchan->chan.device_node, &dma->channels); + } + + tasklet_init(&mdma->tasklet, mpc_dma_tasklet, (unsigned long)mdma); + + /* + * Configure DMA Engine: + * - Dynamic clock, + * - Round-robin group arbitration, + * - Round-robin channel arbitration. + */ + if (mdma->is_mpc8308) { + /* MPC8308 has 16 channels and lacks some registers */ + out_be32(&mdma->regs->dmacr, MPC_DMA_DMACR_ERCA); + + /* enable snooping */ + out_be32(&mdma->regs->dmagpor, MPC_DMA_DMAGPOR_SNOOP_ENABLE); + /* Disable error interrupts */ + out_be32(&mdma->regs->dmaeeil, 0); + + /* Clear interrupts status */ + out_be32(&mdma->regs->dmaintl, 0xFFFF); + out_be32(&mdma->regs->dmaerrl, 0xFFFF); + } else { + out_be32(&mdma->regs->dmacr, MPC_DMA_DMACR_EDCG | + MPC_DMA_DMACR_ERGA | MPC_DMA_DMACR_ERCA); + + /* Disable hardware DMA requests */ + out_be32(&mdma->regs->dmaerqh, 0); + out_be32(&mdma->regs->dmaerql, 0); + + /* Disable error interrupts */ + out_be32(&mdma->regs->dmaeeih, 0); + out_be32(&mdma->regs->dmaeeil, 0); + + /* Clear interrupts status */ + out_be32(&mdma->regs->dmainth, 0xFFFFFFFF); + out_be32(&mdma->regs->dmaintl, 0xFFFFFFFF); + out_be32(&mdma->regs->dmaerrh, 0xFFFFFFFF); + out_be32(&mdma->regs->dmaerrl, 0xFFFFFFFF); + + /* Route interrupts to IPIC */ + out_be32(&mdma->regs->dmaihsa, 0); + out_be32(&mdma->regs->dmailsa, 0); + } + + /* Register DMA engine */ + dev_set_drvdata(dev, mdma); + retval = dma_async_device_register(dma); + if (retval) + goto err_free2; + + /* Register with OF helpers for DMA lookups (nonfatal) */ + if (dev->of_node) { + retval = of_dma_controller_register(dev->of_node, + of_dma_xlate_by_chan_id, mdma); + if (retval) + dev_warn(dev, "Could not register for OF lookup\n"); + } + + return 0; + +err_free2: + if (mdma->is_mpc8308) + free_irq(mdma->irq2, mdma); +err_free1: + free_irq(mdma->irq, mdma); +err_dispose2: + if (mdma->is_mpc8308) + irq_dispose_mapping(mdma->irq2); +err_dispose1: + irq_dispose_mapping(mdma->irq); +err: + return retval; +} + +static int mpc_dma_remove(struct platform_device *op) +{ + struct device *dev = &op->dev; + struct mpc_dma *mdma = dev_get_drvdata(dev); + + if (dev->of_node) + of_dma_controller_free(dev->of_node); + dma_async_device_unregister(&mdma->dma); + if (mdma->is_mpc8308) { + free_irq(mdma->irq2, mdma); + irq_dispose_mapping(mdma->irq2); + } + free_irq(mdma->irq, mdma); + irq_dispose_mapping(mdma->irq); + + return 0; +} + +static const struct of_device_id mpc_dma_match[] = { + { .compatible = "fsl,mpc5121-dma", }, + { .compatible = "fsl,mpc8308-dma", }, + {}, +}; + +static struct platform_driver mpc_dma_driver = { + .probe = mpc_dma_probe, + .remove = mpc_dma_remove, + .driver = { + .name = DRV_NAME, + .of_match_table = mpc_dma_match, + }, +}; + +module_platform_driver(mpc_dma_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Piotr Ziecik <kosmo@semihalf.com>"); diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c new file mode 100644 index 000000000..50f1b422d --- /dev/null +++ b/drivers/dma/mv_xor.c @@ -0,0 +1,1304 @@ +/* + * offload engine driver for the Marvell XOR engine + * Copyright (C) 2007, 2008, Marvell International Ltd. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/memory.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/irqdomain.h> +#include <linux/platform_data/dma-mv_xor.h> + +#include "dmaengine.h" +#include "mv_xor.h" + +static void mv_xor_issue_pending(struct dma_chan *chan); + +#define to_mv_xor_chan(chan) \ + container_of(chan, struct mv_xor_chan, dmachan) + +#define to_mv_xor_slot(tx) \ + container_of(tx, struct mv_xor_desc_slot, async_tx) + +#define mv_chan_to_devp(chan) \ + ((chan)->dmadev.dev) + +static void mv_desc_init(struct mv_xor_desc_slot *desc, + dma_addr_t addr, u32 byte_count, + enum dma_ctrl_flags flags) +{ + struct mv_xor_desc *hw_desc = desc->hw_desc; + + hw_desc->status = XOR_DESC_DMA_OWNED; + hw_desc->phy_next_desc = 0; + /* Enable end-of-descriptor interrupts only for DMA_PREP_INTERRUPT */ + hw_desc->desc_command = (flags & DMA_PREP_INTERRUPT) ? + XOR_DESC_EOD_INT_EN : 0; + hw_desc->phy_dest_addr = addr; + hw_desc->byte_count = byte_count; +} + +static void mv_desc_set_next_desc(struct mv_xor_desc_slot *desc, + u32 next_desc_addr) +{ + struct mv_xor_desc *hw_desc = desc->hw_desc; + BUG_ON(hw_desc->phy_next_desc); + hw_desc->phy_next_desc = next_desc_addr; +} + +static void mv_desc_clear_next_desc(struct mv_xor_desc_slot *desc) +{ + struct mv_xor_desc *hw_desc = desc->hw_desc; + hw_desc->phy_next_desc = 0; +} + +static void mv_desc_set_src_addr(struct mv_xor_desc_slot *desc, + int index, dma_addr_t addr) +{ + struct mv_xor_desc *hw_desc = desc->hw_desc; + hw_desc->phy_src_addr[mv_phy_src_idx(index)] = addr; + if (desc->type == DMA_XOR) + hw_desc->desc_command |= (1 << index); +} + +static u32 mv_chan_get_current_desc(struct mv_xor_chan *chan) +{ + return readl_relaxed(XOR_CURR_DESC(chan)); +} + +static void mv_chan_set_next_descriptor(struct mv_xor_chan *chan, + u32 next_desc_addr) +{ + writel_relaxed(next_desc_addr, XOR_NEXT_DESC(chan)); +} + +static void mv_chan_unmask_interrupts(struct mv_xor_chan *chan) +{ + u32 val = readl_relaxed(XOR_INTR_MASK(chan)); + val |= XOR_INTR_MASK_VALUE << (chan->idx * 16); + writel_relaxed(val, XOR_INTR_MASK(chan)); +} + +static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan) +{ + u32 intr_cause = readl_relaxed(XOR_INTR_CAUSE(chan)); + intr_cause = (intr_cause >> (chan->idx * 16)) & 0xFFFF; + return intr_cause; +} + +static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan) +{ + u32 val; + + val = XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | XOR_INT_STOPPED; + val = ~(val << (chan->idx * 16)); + dev_dbg(mv_chan_to_devp(chan), "%s, val 0x%08x\n", __func__, val); + writel_relaxed(val, XOR_INTR_CAUSE(chan)); +} + +static void mv_xor_device_clear_err_status(struct mv_xor_chan *chan) +{ + u32 val = 0xFFFF0000 >> (chan->idx * 16); + writel_relaxed(val, XOR_INTR_CAUSE(chan)); +} + +static void mv_set_mode(struct mv_xor_chan *chan, + enum dma_transaction_type type) +{ + u32 op_mode; + u32 config = readl_relaxed(XOR_CONFIG(chan)); + + switch (type) { + case DMA_XOR: + op_mode = XOR_OPERATION_MODE_XOR; + break; + case DMA_MEMCPY: + op_mode = XOR_OPERATION_MODE_MEMCPY; + break; + default: + dev_err(mv_chan_to_devp(chan), + "error: unsupported operation %d\n", + type); + BUG(); + return; + } + + config &= ~0x7; + config |= op_mode; + +#if defined(__BIG_ENDIAN) + config |= XOR_DESCRIPTOR_SWAP; +#else + config &= ~XOR_DESCRIPTOR_SWAP; +#endif + + writel_relaxed(config, XOR_CONFIG(chan)); + chan->current_type = type; +} + +static void mv_chan_activate(struct mv_xor_chan *chan) +{ + dev_dbg(mv_chan_to_devp(chan), " activate chan.\n"); + + /* writel ensures all descriptors are flushed before activation */ + writel(BIT(0), XOR_ACTIVATION(chan)); +} + +static char mv_chan_is_busy(struct mv_xor_chan *chan) +{ + u32 state = readl_relaxed(XOR_ACTIVATION(chan)); + + state = (state >> 4) & 0x3; + + return (state == 1) ? 1 : 0; +} + +/** + * mv_xor_free_slots - flags descriptor slots for reuse + * @slot: Slot to free + * Caller must hold &mv_chan->lock while calling this function + */ +static void mv_xor_free_slots(struct mv_xor_chan *mv_chan, + struct mv_xor_desc_slot *slot) +{ + dev_dbg(mv_chan_to_devp(mv_chan), "%s %d slot %p\n", + __func__, __LINE__, slot); + + slot->slot_used = 0; + +} + +/* + * mv_xor_start_new_chain - program the engine to operate on new chain headed by + * sw_desc + * Caller must hold &mv_chan->lock while calling this function + */ +static void mv_xor_start_new_chain(struct mv_xor_chan *mv_chan, + struct mv_xor_desc_slot *sw_desc) +{ + dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: sw_desc %p\n", + __func__, __LINE__, sw_desc); + + /* set the hardware chain */ + mv_chan_set_next_descriptor(mv_chan, sw_desc->async_tx.phys); + + mv_chan->pending++; + mv_xor_issue_pending(&mv_chan->dmachan); +} + +static dma_cookie_t +mv_xor_run_tx_complete_actions(struct mv_xor_desc_slot *desc, + struct mv_xor_chan *mv_chan, dma_cookie_t cookie) +{ + BUG_ON(desc->async_tx.cookie < 0); + + if (desc->async_tx.cookie > 0) { + cookie = desc->async_tx.cookie; + + /* call the callback (must not sleep or submit new + * operations to this channel) + */ + if (desc->async_tx.callback) + desc->async_tx.callback( + desc->async_tx.callback_param); + + dma_descriptor_unmap(&desc->async_tx); + } + + /* run dependent operations */ + dma_run_dependencies(&desc->async_tx); + + return cookie; +} + +static int +mv_xor_clean_completed_slots(struct mv_xor_chan *mv_chan) +{ + struct mv_xor_desc_slot *iter, *_iter; + + dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__); + list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots, + completed_node) { + + if (async_tx_test_ack(&iter->async_tx)) { + list_del(&iter->completed_node); + mv_xor_free_slots(mv_chan, iter); + } + } + return 0; +} + +static int +mv_xor_clean_slot(struct mv_xor_desc_slot *desc, + struct mv_xor_chan *mv_chan) +{ + dev_dbg(mv_chan_to_devp(mv_chan), "%s %d: desc %p flags %d\n", + __func__, __LINE__, desc, desc->async_tx.flags); + list_del(&desc->chain_node); + /* the client is allowed to attach dependent operations + * until 'ack' is set + */ + if (!async_tx_test_ack(&desc->async_tx)) { + /* move this slot to the completed_slots */ + list_add_tail(&desc->completed_node, &mv_chan->completed_slots); + return 0; + } + + mv_xor_free_slots(mv_chan, desc); + return 0; +} + +/* This function must be called with the mv_xor_chan spinlock held */ +static void mv_xor_slot_cleanup(struct mv_xor_chan *mv_chan) +{ + struct mv_xor_desc_slot *iter, *_iter; + dma_cookie_t cookie = 0; + int busy = mv_chan_is_busy(mv_chan); + u32 current_desc = mv_chan_get_current_desc(mv_chan); + int current_cleaned = 0; + struct mv_xor_desc *hw_desc; + + dev_dbg(mv_chan_to_devp(mv_chan), "%s %d\n", __func__, __LINE__); + dev_dbg(mv_chan_to_devp(mv_chan), "current_desc %x\n", current_desc); + mv_xor_clean_completed_slots(mv_chan); + + /* free completed slots from the chain starting with + * the oldest descriptor + */ + + list_for_each_entry_safe(iter, _iter, &mv_chan->chain, + chain_node) { + + /* clean finished descriptors */ + hw_desc = iter->hw_desc; + if (hw_desc->status & XOR_DESC_SUCCESS) { + cookie = mv_xor_run_tx_complete_actions(iter, mv_chan, + cookie); + + /* done processing desc, clean slot */ + mv_xor_clean_slot(iter, mv_chan); + + /* break if we did cleaned the current */ + if (iter->async_tx.phys == current_desc) { + current_cleaned = 1; + break; + } + } else { + if (iter->async_tx.phys == current_desc) { + current_cleaned = 0; + break; + } + } + } + + if ((busy == 0) && !list_empty(&mv_chan->chain)) { + if (current_cleaned) { + /* + * current descriptor cleaned and removed, run + * from list head + */ + iter = list_entry(mv_chan->chain.next, + struct mv_xor_desc_slot, + chain_node); + mv_xor_start_new_chain(mv_chan, iter); + } else { + if (!list_is_last(&iter->chain_node, &mv_chan->chain)) { + /* + * descriptors are still waiting after + * current, trigger them + */ + iter = list_entry(iter->chain_node.next, + struct mv_xor_desc_slot, + chain_node); + mv_xor_start_new_chain(mv_chan, iter); + } else { + /* + * some descriptors are still waiting + * to be cleaned + */ + tasklet_schedule(&mv_chan->irq_tasklet); + } + } + } + + if (cookie > 0) + mv_chan->dmachan.completed_cookie = cookie; +} + +static void mv_xor_tasklet(unsigned long data) +{ + struct mv_xor_chan *chan = (struct mv_xor_chan *) data; + + spin_lock_bh(&chan->lock); + mv_xor_slot_cleanup(chan); + spin_unlock_bh(&chan->lock); +} + +static struct mv_xor_desc_slot * +mv_xor_alloc_slot(struct mv_xor_chan *mv_chan) +{ + struct mv_xor_desc_slot *iter, *_iter; + int retry = 0; + + /* start search from the last allocated descrtiptor + * if a contiguous allocation can not be found start searching + * from the beginning of the list + */ +retry: + if (retry == 0) + iter = mv_chan->last_used; + else + iter = list_entry(&mv_chan->all_slots, + struct mv_xor_desc_slot, + slot_node); + + list_for_each_entry_safe_continue( + iter, _iter, &mv_chan->all_slots, slot_node) { + + prefetch(_iter); + prefetch(&_iter->async_tx); + if (iter->slot_used) { + /* give up after finding the first busy slot + * on the second pass through the list + */ + if (retry) + break; + continue; + } + + /* pre-ack descriptor */ + async_tx_ack(&iter->async_tx); + + iter->slot_used = 1; + INIT_LIST_HEAD(&iter->chain_node); + iter->async_tx.cookie = -EBUSY; + mv_chan->last_used = iter; + mv_desc_clear_next_desc(iter); + + return iter; + + } + if (!retry++) + goto retry; + + /* try to free some slots if the allocation fails */ + tasklet_schedule(&mv_chan->irq_tasklet); + + return NULL; +} + +/************************ DMA engine API functions ****************************/ +static dma_cookie_t +mv_xor_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct mv_xor_desc_slot *sw_desc = to_mv_xor_slot(tx); + struct mv_xor_chan *mv_chan = to_mv_xor_chan(tx->chan); + struct mv_xor_desc_slot *old_chain_tail; + dma_cookie_t cookie; + int new_hw_chain = 1; + + dev_dbg(mv_chan_to_devp(mv_chan), + "%s sw_desc %p: async_tx %p\n", + __func__, sw_desc, &sw_desc->async_tx); + + spin_lock_bh(&mv_chan->lock); + cookie = dma_cookie_assign(tx); + + if (list_empty(&mv_chan->chain)) + list_add_tail(&sw_desc->chain_node, &mv_chan->chain); + else { + new_hw_chain = 0; + + old_chain_tail = list_entry(mv_chan->chain.prev, + struct mv_xor_desc_slot, + chain_node); + list_add_tail(&sw_desc->chain_node, &mv_chan->chain); + + dev_dbg(mv_chan_to_devp(mv_chan), "Append to last desc %pa\n", + &old_chain_tail->async_tx.phys); + + /* fix up the hardware chain */ + mv_desc_set_next_desc(old_chain_tail, sw_desc->async_tx.phys); + + /* if the channel is not busy */ + if (!mv_chan_is_busy(mv_chan)) { + u32 current_desc = mv_chan_get_current_desc(mv_chan); + /* + * and the curren desc is the end of the chain before + * the append, then we need to start the channel + */ + if (current_desc == old_chain_tail->async_tx.phys) + new_hw_chain = 1; + } + } + + if (new_hw_chain) + mv_xor_start_new_chain(mv_chan, sw_desc); + + spin_unlock_bh(&mv_chan->lock); + + return cookie; +} + +/* returns the number of allocated descriptors */ +static int mv_xor_alloc_chan_resources(struct dma_chan *chan) +{ + void *virt_desc; + dma_addr_t dma_desc; + int idx; + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + struct mv_xor_desc_slot *slot = NULL; + int num_descs_in_pool = MV_XOR_POOL_SIZE/MV_XOR_SLOT_SIZE; + + /* Allocate descriptor slots */ + idx = mv_chan->slots_allocated; + while (idx < num_descs_in_pool) { + slot = kzalloc(sizeof(*slot), GFP_KERNEL); + if (!slot) { + dev_info(mv_chan_to_devp(mv_chan), + "channel only initialized %d descriptor slots", + idx); + break; + } + virt_desc = mv_chan->dma_desc_pool_virt; + slot->hw_desc = virt_desc + idx * MV_XOR_SLOT_SIZE; + + dma_async_tx_descriptor_init(&slot->async_tx, chan); + slot->async_tx.tx_submit = mv_xor_tx_submit; + INIT_LIST_HEAD(&slot->chain_node); + INIT_LIST_HEAD(&slot->slot_node); + dma_desc = mv_chan->dma_desc_pool; + slot->async_tx.phys = dma_desc + idx * MV_XOR_SLOT_SIZE; + slot->idx = idx++; + + spin_lock_bh(&mv_chan->lock); + mv_chan->slots_allocated = idx; + list_add_tail(&slot->slot_node, &mv_chan->all_slots); + spin_unlock_bh(&mv_chan->lock); + } + + if (mv_chan->slots_allocated && !mv_chan->last_used) + mv_chan->last_used = list_entry(mv_chan->all_slots.next, + struct mv_xor_desc_slot, + slot_node); + + dev_dbg(mv_chan_to_devp(mv_chan), + "allocated %d descriptor slots last_used: %p\n", + mv_chan->slots_allocated, mv_chan->last_used); + + return mv_chan->slots_allocated ? : -ENOMEM; +} + +static struct dma_async_tx_descriptor * +mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src, + unsigned int src_cnt, size_t len, unsigned long flags) +{ + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + struct mv_xor_desc_slot *sw_desc; + + if (unlikely(len < MV_XOR_MIN_BYTE_COUNT)) + return NULL; + + BUG_ON(len > MV_XOR_MAX_BYTE_COUNT); + + dev_dbg(mv_chan_to_devp(mv_chan), + "%s src_cnt: %d len: %u dest %pad flags: %ld\n", + __func__, src_cnt, len, &dest, flags); + + spin_lock_bh(&mv_chan->lock); + sw_desc = mv_xor_alloc_slot(mv_chan); + if (sw_desc) { + sw_desc->type = DMA_XOR; + sw_desc->async_tx.flags = flags; + mv_desc_init(sw_desc, dest, len, flags); + while (src_cnt--) + mv_desc_set_src_addr(sw_desc, src_cnt, src[src_cnt]); + } + spin_unlock_bh(&mv_chan->lock); + dev_dbg(mv_chan_to_devp(mv_chan), + "%s sw_desc %p async_tx %p \n", + __func__, sw_desc, &sw_desc->async_tx); + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static struct dma_async_tx_descriptor * +mv_xor_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + /* + * A MEMCPY operation is identical to an XOR operation with only + * a single source address. + */ + return mv_xor_prep_dma_xor(chan, dest, &src, 1, len, flags); +} + +static struct dma_async_tx_descriptor * +mv_xor_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags) +{ + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + dma_addr_t src, dest; + size_t len; + + src = mv_chan->dummy_src_addr; + dest = mv_chan->dummy_dst_addr; + len = MV_XOR_MIN_BYTE_COUNT; + + /* + * We implement the DMA_INTERRUPT operation as a minimum sized + * XOR operation with a single dummy source address. + */ + return mv_xor_prep_dma_xor(chan, dest, &src, 1, len, flags); +} + +static void mv_xor_free_chan_resources(struct dma_chan *chan) +{ + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + struct mv_xor_desc_slot *iter, *_iter; + int in_use_descs = 0; + + spin_lock_bh(&mv_chan->lock); + + mv_xor_slot_cleanup(mv_chan); + + list_for_each_entry_safe(iter, _iter, &mv_chan->chain, + chain_node) { + in_use_descs++; + list_del(&iter->chain_node); + } + list_for_each_entry_safe(iter, _iter, &mv_chan->completed_slots, + completed_node) { + in_use_descs++; + list_del(&iter->completed_node); + } + list_for_each_entry_safe_reverse( + iter, _iter, &mv_chan->all_slots, slot_node) { + list_del(&iter->slot_node); + kfree(iter); + mv_chan->slots_allocated--; + } + mv_chan->last_used = NULL; + + dev_dbg(mv_chan_to_devp(mv_chan), "%s slots_allocated %d\n", + __func__, mv_chan->slots_allocated); + spin_unlock_bh(&mv_chan->lock); + + if (in_use_descs) + dev_err(mv_chan_to_devp(mv_chan), + "freeing %d in use descriptors!\n", in_use_descs); +} + +/** + * mv_xor_status - poll the status of an XOR transaction + * @chan: XOR channel handle + * @cookie: XOR transaction identifier + * @txstate: XOR transactions state holder (or NULL) + */ +static enum dma_status mv_xor_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + enum dma_status ret; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + spin_lock_bh(&mv_chan->lock); + mv_xor_slot_cleanup(mv_chan); + spin_unlock_bh(&mv_chan->lock); + + return dma_cookie_status(chan, cookie, txstate); +} + +static void mv_dump_xor_regs(struct mv_xor_chan *chan) +{ + u32 val; + + val = readl_relaxed(XOR_CONFIG(chan)); + dev_err(mv_chan_to_devp(chan), "config 0x%08x\n", val); + + val = readl_relaxed(XOR_ACTIVATION(chan)); + dev_err(mv_chan_to_devp(chan), "activation 0x%08x\n", val); + + val = readl_relaxed(XOR_INTR_CAUSE(chan)); + dev_err(mv_chan_to_devp(chan), "intr cause 0x%08x\n", val); + + val = readl_relaxed(XOR_INTR_MASK(chan)); + dev_err(mv_chan_to_devp(chan), "intr mask 0x%08x\n", val); + + val = readl_relaxed(XOR_ERROR_CAUSE(chan)); + dev_err(mv_chan_to_devp(chan), "error cause 0x%08x\n", val); + + val = readl_relaxed(XOR_ERROR_ADDR(chan)); + dev_err(mv_chan_to_devp(chan), "error addr 0x%08x\n", val); +} + +static void mv_xor_err_interrupt_handler(struct mv_xor_chan *chan, + u32 intr_cause) +{ + if (intr_cause & XOR_INT_ERR_DECODE) { + dev_dbg(mv_chan_to_devp(chan), "ignoring address decode error\n"); + return; + } + + dev_err(mv_chan_to_devp(chan), "error on chan %d. intr cause 0x%08x\n", + chan->idx, intr_cause); + + mv_dump_xor_regs(chan); + WARN_ON(1); +} + +static irqreturn_t mv_xor_interrupt_handler(int irq, void *data) +{ + struct mv_xor_chan *chan = data; + u32 intr_cause = mv_chan_get_intr_cause(chan); + + dev_dbg(mv_chan_to_devp(chan), "intr cause %x\n", intr_cause); + + if (intr_cause & XOR_INTR_ERRORS) + mv_xor_err_interrupt_handler(chan, intr_cause); + + tasklet_schedule(&chan->irq_tasklet); + + mv_xor_device_clear_eoc_cause(chan); + + return IRQ_HANDLED; +} + +static void mv_xor_issue_pending(struct dma_chan *chan) +{ + struct mv_xor_chan *mv_chan = to_mv_xor_chan(chan); + + if (mv_chan->pending >= MV_XOR_THRESHOLD) { + mv_chan->pending = 0; + mv_chan_activate(mv_chan); + } +} + +/* + * Perform a transaction to verify the HW works. + */ + +static int mv_xor_memcpy_self_test(struct mv_xor_chan *mv_chan) +{ + int i, ret; + void *src, *dest; + dma_addr_t src_dma, dest_dma; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + struct dma_async_tx_descriptor *tx; + struct dmaengine_unmap_data *unmap; + int err = 0; + + src = kmalloc(sizeof(u8) * PAGE_SIZE, GFP_KERNEL); + if (!src) + return -ENOMEM; + + dest = kzalloc(sizeof(u8) * PAGE_SIZE, GFP_KERNEL); + if (!dest) { + kfree(src); + return -ENOMEM; + } + + /* Fill in src buffer */ + for (i = 0; i < PAGE_SIZE; i++) + ((u8 *) src)[i] = (u8)i; + + dma_chan = &mv_chan->dmachan; + if (mv_xor_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + unmap = dmaengine_get_unmap_data(dma_chan->device->dev, 2, GFP_KERNEL); + if (!unmap) { + err = -ENOMEM; + goto free_resources; + } + + src_dma = dma_map_page(dma_chan->device->dev, virt_to_page(src), 0, + PAGE_SIZE, DMA_TO_DEVICE); + unmap->addr[0] = src_dma; + + ret = dma_mapping_error(dma_chan->device->dev, src_dma); + if (ret) { + err = -ENOMEM; + goto free_resources; + } + unmap->to_cnt = 1; + + dest_dma = dma_map_page(dma_chan->device->dev, virt_to_page(dest), 0, + PAGE_SIZE, DMA_FROM_DEVICE); + unmap->addr[1] = dest_dma; + + ret = dma_mapping_error(dma_chan->device->dev, dest_dma); + if (ret) { + err = -ENOMEM; + goto free_resources; + } + unmap->from_cnt = 1; + unmap->len = PAGE_SIZE; + + tx = mv_xor_prep_dma_memcpy(dma_chan, dest_dma, src_dma, + PAGE_SIZE, 0); + if (!tx) { + dev_err(dma_chan->device->dev, + "Self-test cannot prepare operation, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + cookie = mv_xor_tx_submit(tx); + if (dma_submit_error(cookie)) { + dev_err(dma_chan->device->dev, + "Self-test submit error, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + mv_xor_issue_pending(dma_chan); + async_tx_ack(tx); + msleep(1); + + if (mv_xor_status(dma_chan, cookie, NULL) != + DMA_COMPLETE) { + dev_err(dma_chan->device->dev, + "Self-test copy timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma, + PAGE_SIZE, DMA_FROM_DEVICE); + if (memcmp(src, dest, PAGE_SIZE)) { + dev_err(dma_chan->device->dev, + "Self-test copy failed compare, disabling\n"); + err = -ENODEV; + goto free_resources; + } + +free_resources: + dmaengine_unmap_put(unmap); + mv_xor_free_chan_resources(dma_chan); +out: + kfree(src); + kfree(dest); + return err; +} + +#define MV_XOR_NUM_SRC_TEST 4 /* must be <= 15 */ +static int +mv_xor_xor_self_test(struct mv_xor_chan *mv_chan) +{ + int i, src_idx, ret; + struct page *dest; + struct page *xor_srcs[MV_XOR_NUM_SRC_TEST]; + dma_addr_t dma_srcs[MV_XOR_NUM_SRC_TEST]; + dma_addr_t dest_dma; + struct dma_async_tx_descriptor *tx; + struct dmaengine_unmap_data *unmap; + struct dma_chan *dma_chan; + dma_cookie_t cookie; + u8 cmp_byte = 0; + u32 cmp_word; + int err = 0; + int src_count = MV_XOR_NUM_SRC_TEST; + + for (src_idx = 0; src_idx < src_count; src_idx++) { + xor_srcs[src_idx] = alloc_page(GFP_KERNEL); + if (!xor_srcs[src_idx]) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + } + + dest = alloc_page(GFP_KERNEL); + if (!dest) { + while (src_idx--) + __free_page(xor_srcs[src_idx]); + return -ENOMEM; + } + + /* Fill in src buffers */ + for (src_idx = 0; src_idx < src_count; src_idx++) { + u8 *ptr = page_address(xor_srcs[src_idx]); + for (i = 0; i < PAGE_SIZE; i++) + ptr[i] = (1 << src_idx); + } + + for (src_idx = 0; src_idx < src_count; src_idx++) + cmp_byte ^= (u8) (1 << src_idx); + + cmp_word = (cmp_byte << 24) | (cmp_byte << 16) | + (cmp_byte << 8) | cmp_byte; + + memset(page_address(dest), 0, PAGE_SIZE); + + dma_chan = &mv_chan->dmachan; + if (mv_xor_alloc_chan_resources(dma_chan) < 1) { + err = -ENODEV; + goto out; + } + + unmap = dmaengine_get_unmap_data(dma_chan->device->dev, src_count + 1, + GFP_KERNEL); + if (!unmap) { + err = -ENOMEM; + goto free_resources; + } + + /* test xor */ + for (i = 0; i < src_count; i++) { + unmap->addr[i] = dma_map_page(dma_chan->device->dev, xor_srcs[i], + 0, PAGE_SIZE, DMA_TO_DEVICE); + dma_srcs[i] = unmap->addr[i]; + ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[i]); + if (ret) { + err = -ENOMEM; + goto free_resources; + } + unmap->to_cnt++; + } + + unmap->addr[src_count] = dma_map_page(dma_chan->device->dev, dest, 0, PAGE_SIZE, + DMA_FROM_DEVICE); + dest_dma = unmap->addr[src_count]; + ret = dma_mapping_error(dma_chan->device->dev, unmap->addr[src_count]); + if (ret) { + err = -ENOMEM; + goto free_resources; + } + unmap->from_cnt = 1; + unmap->len = PAGE_SIZE; + + tx = mv_xor_prep_dma_xor(dma_chan, dest_dma, dma_srcs, + src_count, PAGE_SIZE, 0); + if (!tx) { + dev_err(dma_chan->device->dev, + "Self-test cannot prepare operation, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + cookie = mv_xor_tx_submit(tx); + if (dma_submit_error(cookie)) { + dev_err(dma_chan->device->dev, + "Self-test submit error, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + mv_xor_issue_pending(dma_chan); + async_tx_ack(tx); + msleep(8); + + if (mv_xor_status(dma_chan, cookie, NULL) != + DMA_COMPLETE) { + dev_err(dma_chan->device->dev, + "Self-test xor timed out, disabling\n"); + err = -ENODEV; + goto free_resources; + } + + dma_sync_single_for_cpu(dma_chan->device->dev, dest_dma, + PAGE_SIZE, DMA_FROM_DEVICE); + for (i = 0; i < (PAGE_SIZE / sizeof(u32)); i++) { + u32 *ptr = page_address(dest); + if (ptr[i] != cmp_word) { + dev_err(dma_chan->device->dev, + "Self-test xor failed compare, disabling. index %d, data %x, expected %x\n", + i, ptr[i], cmp_word); + err = -ENODEV; + goto free_resources; + } + } + +free_resources: + dmaengine_unmap_put(unmap); + mv_xor_free_chan_resources(dma_chan); +out: + src_idx = src_count; + while (src_idx--) + __free_page(xor_srcs[src_idx]); + __free_page(dest); + return err; +} + +static int mv_xor_channel_remove(struct mv_xor_chan *mv_chan) +{ + struct dma_chan *chan, *_chan; + struct device *dev = mv_chan->dmadev.dev; + + dma_async_device_unregister(&mv_chan->dmadev); + + dma_free_coherent(dev, MV_XOR_POOL_SIZE, + mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool); + dma_unmap_single(dev, mv_chan->dummy_src_addr, + MV_XOR_MIN_BYTE_COUNT, DMA_FROM_DEVICE); + dma_unmap_single(dev, mv_chan->dummy_dst_addr, + MV_XOR_MIN_BYTE_COUNT, DMA_TO_DEVICE); + + list_for_each_entry_safe(chan, _chan, &mv_chan->dmadev.channels, + device_node) { + list_del(&chan->device_node); + } + + free_irq(mv_chan->irq, mv_chan); + + return 0; +} + +static struct mv_xor_chan * +mv_xor_channel_add(struct mv_xor_device *xordev, + struct platform_device *pdev, + int idx, dma_cap_mask_t cap_mask, int irq) +{ + int ret = 0; + struct mv_xor_chan *mv_chan; + struct dma_device *dma_dev; + + mv_chan = devm_kzalloc(&pdev->dev, sizeof(*mv_chan), GFP_KERNEL); + if (!mv_chan) + return ERR_PTR(-ENOMEM); + + mv_chan->idx = idx; + mv_chan->irq = irq; + + dma_dev = &mv_chan->dmadev; + + /* + * These source and destination dummy buffers are used to implement + * a DMA_INTERRUPT operation as a minimum-sized XOR operation. + * Hence, we only need to map the buffers at initialization-time. + */ + mv_chan->dummy_src_addr = dma_map_single(dma_dev->dev, + mv_chan->dummy_src, MV_XOR_MIN_BYTE_COUNT, DMA_FROM_DEVICE); + mv_chan->dummy_dst_addr = dma_map_single(dma_dev->dev, + mv_chan->dummy_dst, MV_XOR_MIN_BYTE_COUNT, DMA_TO_DEVICE); + + /* allocate coherent memory for hardware descriptors + * note: writecombine gives slightly better performance, but + * requires that we explicitly flush the writes + */ + mv_chan->dma_desc_pool_virt = + dma_alloc_writecombine(&pdev->dev, MV_XOR_POOL_SIZE, + &mv_chan->dma_desc_pool, GFP_KERNEL); + if (!mv_chan->dma_desc_pool_virt) + return ERR_PTR(-ENOMEM); + + /* discover transaction capabilites from the platform data */ + dma_dev->cap_mask = cap_mask; + + INIT_LIST_HEAD(&dma_dev->channels); + + /* set base routines */ + dma_dev->device_alloc_chan_resources = mv_xor_alloc_chan_resources; + dma_dev->device_free_chan_resources = mv_xor_free_chan_resources; + dma_dev->device_tx_status = mv_xor_status; + dma_dev->device_issue_pending = mv_xor_issue_pending; + dma_dev->dev = &pdev->dev; + + /* set prep routines based on capability */ + if (dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask)) + dma_dev->device_prep_dma_interrupt = mv_xor_prep_dma_interrupt; + if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) + dma_dev->device_prep_dma_memcpy = mv_xor_prep_dma_memcpy; + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + dma_dev->max_xor = 8; + dma_dev->device_prep_dma_xor = mv_xor_prep_dma_xor; + } + + mv_chan->mmr_base = xordev->xor_base; + mv_chan->mmr_high_base = xordev->xor_high_base; + tasklet_init(&mv_chan->irq_tasklet, mv_xor_tasklet, (unsigned long) + mv_chan); + + /* clear errors before enabling interrupts */ + mv_xor_device_clear_err_status(mv_chan); + + ret = request_irq(mv_chan->irq, mv_xor_interrupt_handler, + 0, dev_name(&pdev->dev), mv_chan); + if (ret) + goto err_free_dma; + + mv_chan_unmask_interrupts(mv_chan); + + mv_set_mode(mv_chan, DMA_XOR); + + spin_lock_init(&mv_chan->lock); + INIT_LIST_HEAD(&mv_chan->chain); + INIT_LIST_HEAD(&mv_chan->completed_slots); + INIT_LIST_HEAD(&mv_chan->all_slots); + mv_chan->dmachan.device = dma_dev; + dma_cookie_init(&mv_chan->dmachan); + + list_add_tail(&mv_chan->dmachan.device_node, &dma_dev->channels); + + if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) { + ret = mv_xor_memcpy_self_test(mv_chan); + dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); + if (ret) + goto err_free_irq; + } + + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + ret = mv_xor_xor_self_test(mv_chan); + dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); + if (ret) + goto err_free_irq; + } + + dev_info(&pdev->dev, "Marvell XOR: ( %s%s%s)\n", + dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "xor " : "", + dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "cpy " : "", + dma_has_cap(DMA_INTERRUPT, dma_dev->cap_mask) ? "intr " : ""); + + dma_async_device_register(dma_dev); + return mv_chan; + +err_free_irq: + free_irq(mv_chan->irq, mv_chan); + err_free_dma: + dma_free_coherent(&pdev->dev, MV_XOR_POOL_SIZE, + mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool); + return ERR_PTR(ret); +} + +static void +mv_xor_conf_mbus_windows(struct mv_xor_device *xordev, + const struct mbus_dram_target_info *dram) +{ + void __iomem *base = xordev->xor_high_base; + u32 win_enable = 0; + int i; + + for (i = 0; i < 8; i++) { + writel(0, base + WINDOW_BASE(i)); + writel(0, base + WINDOW_SIZE(i)); + if (i < 4) + writel(0, base + WINDOW_REMAP_HIGH(i)); + } + + for (i = 0; i < dram->num_cs; i++) { + const struct mbus_dram_window *cs = dram->cs + i; + + writel((cs->base & 0xffff0000) | + (cs->mbus_attr << 8) | + dram->mbus_dram_target_id, base + WINDOW_BASE(i)); + writel((cs->size - 1) & 0xffff0000, base + WINDOW_SIZE(i)); + + win_enable |= (1 << i); + win_enable |= 3 << (16 + (2 * i)); + } + + writel(win_enable, base + WINDOW_BAR_ENABLE(0)); + writel(win_enable, base + WINDOW_BAR_ENABLE(1)); + writel(0, base + WINDOW_OVERRIDE_CTRL(0)); + writel(0, base + WINDOW_OVERRIDE_CTRL(1)); +} + +static int mv_xor_probe(struct platform_device *pdev) +{ + const struct mbus_dram_target_info *dram; + struct mv_xor_device *xordev; + struct mv_xor_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct resource *res; + int i, ret; + + dev_notice(&pdev->dev, "Marvell shared XOR driver\n"); + + xordev = devm_kzalloc(&pdev->dev, sizeof(*xordev), GFP_KERNEL); + if (!xordev) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + + xordev->xor_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!xordev->xor_base) + return -EBUSY; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) + return -ENODEV; + + xordev->xor_high_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!xordev->xor_high_base) + return -EBUSY; + + platform_set_drvdata(pdev, xordev); + + /* + * (Re-)program MBUS remapping windows if we are asked to. + */ + dram = mv_mbus_dram_info(); + if (dram) + mv_xor_conf_mbus_windows(xordev, dram); + + /* Not all platforms can gate the clock, so it is not + * an error if the clock does not exists. + */ + xordev->clk = clk_get(&pdev->dev, NULL); + if (!IS_ERR(xordev->clk)) + clk_prepare_enable(xordev->clk); + + if (pdev->dev.of_node) { + struct device_node *np; + int i = 0; + + for_each_child_of_node(pdev->dev.of_node, np) { + struct mv_xor_chan *chan; + dma_cap_mask_t cap_mask; + int irq; + + dma_cap_zero(cap_mask); + if (of_property_read_bool(np, "dmacap,memcpy")) + dma_cap_set(DMA_MEMCPY, cap_mask); + if (of_property_read_bool(np, "dmacap,xor")) + dma_cap_set(DMA_XOR, cap_mask); + if (of_property_read_bool(np, "dmacap,interrupt")) + dma_cap_set(DMA_INTERRUPT, cap_mask); + + irq = irq_of_parse_and_map(np, 0); + if (!irq) { + ret = -ENODEV; + goto err_channel_add; + } + + chan = mv_xor_channel_add(xordev, pdev, i, + cap_mask, irq); + if (IS_ERR(chan)) { + ret = PTR_ERR(chan); + irq_dispose_mapping(irq); + goto err_channel_add; + } + + xordev->channels[i] = chan; + i++; + } + } else if (pdata && pdata->channels) { + for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) { + struct mv_xor_channel_data *cd; + struct mv_xor_chan *chan; + int irq; + + cd = &pdata->channels[i]; + if (!cd) { + ret = -ENODEV; + goto err_channel_add; + } + + irq = platform_get_irq(pdev, i); + if (irq < 0) { + ret = irq; + goto err_channel_add; + } + + chan = mv_xor_channel_add(xordev, pdev, i, + cd->cap_mask, irq); + if (IS_ERR(chan)) { + ret = PTR_ERR(chan); + goto err_channel_add; + } + + xordev->channels[i] = chan; + } + } + + return 0; + +err_channel_add: + for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) + if (xordev->channels[i]) { + mv_xor_channel_remove(xordev->channels[i]); + if (pdev->dev.of_node) + irq_dispose_mapping(xordev->channels[i]->irq); + } + + if (!IS_ERR(xordev->clk)) { + clk_disable_unprepare(xordev->clk); + clk_put(xordev->clk); + } + + return ret; +} + +static int mv_xor_remove(struct platform_device *pdev) +{ + struct mv_xor_device *xordev = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) { + if (xordev->channels[i]) + mv_xor_channel_remove(xordev->channels[i]); + } + + if (!IS_ERR(xordev->clk)) { + clk_disable_unprepare(xordev->clk); + clk_put(xordev->clk); + } + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id mv_xor_dt_ids[] = { + { .compatible = "marvell,orion-xor", }, + {}, +}; +MODULE_DEVICE_TABLE(of, mv_xor_dt_ids); +#endif + +static struct platform_driver mv_xor_driver = { + .probe = mv_xor_probe, + .remove = mv_xor_remove, + .driver = { + .name = MV_XOR_NAME, + .of_match_table = of_match_ptr(mv_xor_dt_ids), + }, +}; + + +static int __init mv_xor_init(void) +{ + return platform_driver_register(&mv_xor_driver); +} +module_init(mv_xor_init); + +/* it's currently unsafe to unload this module */ +#if 0 +static void __exit mv_xor_exit(void) +{ + platform_driver_unregister(&mv_xor_driver); + return; +} + +module_exit(mv_xor_exit); +#endif + +MODULE_AUTHOR("Saeed Bishara <saeed@marvell.com>"); +MODULE_DESCRIPTION("DMA engine driver for Marvell's XOR engine"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/mv_xor.h b/drivers/dma/mv_xor.h new file mode 100644 index 000000000..0e302b3a3 --- /dev/null +++ b/drivers/dma/mv_xor.h @@ -0,0 +1,190 @@ +/* + * Copyright (C) 2007, 2008, Marvell International Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#ifndef MV_XOR_H +#define MV_XOR_H + +#include <linux/types.h> +#include <linux/io.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> + +#define MV_XOR_POOL_SIZE PAGE_SIZE +#define MV_XOR_SLOT_SIZE 64 +#define MV_XOR_THRESHOLD 1 +#define MV_XOR_MAX_CHANNELS 2 + +#define MV_XOR_MIN_BYTE_COUNT SZ_128 +#define MV_XOR_MAX_BYTE_COUNT (SZ_16M - 1) + +/* Values for the XOR_CONFIG register */ +#define XOR_OPERATION_MODE_XOR 0 +#define XOR_OPERATION_MODE_MEMCPY 2 +#define XOR_DESCRIPTOR_SWAP BIT(14) +#define XOR_DESC_SUCCESS 0x40000000 + +#define XOR_DESC_DMA_OWNED BIT(31) +#define XOR_DESC_EOD_INT_EN BIT(31) + +#define XOR_CURR_DESC(chan) (chan->mmr_high_base + 0x10 + (chan->idx * 4)) +#define XOR_NEXT_DESC(chan) (chan->mmr_high_base + 0x00 + (chan->idx * 4)) +#define XOR_BYTE_COUNT(chan) (chan->mmr_high_base + 0x20 + (chan->idx * 4)) +#define XOR_DEST_POINTER(chan) (chan->mmr_high_base + 0xB0 + (chan->idx * 4)) +#define XOR_BLOCK_SIZE(chan) (chan->mmr_high_base + 0xC0 + (chan->idx * 4)) +#define XOR_INIT_VALUE_LOW(chan) (chan->mmr_high_base + 0xE0) +#define XOR_INIT_VALUE_HIGH(chan) (chan->mmr_high_base + 0xE4) + +#define XOR_CONFIG(chan) (chan->mmr_base + 0x10 + (chan->idx * 4)) +#define XOR_ACTIVATION(chan) (chan->mmr_base + 0x20 + (chan->idx * 4)) +#define XOR_INTR_CAUSE(chan) (chan->mmr_base + 0x30) +#define XOR_INTR_MASK(chan) (chan->mmr_base + 0x40) +#define XOR_ERROR_CAUSE(chan) (chan->mmr_base + 0x50) +#define XOR_ERROR_ADDR(chan) (chan->mmr_base + 0x60) + +#define XOR_INT_END_OF_DESC BIT(0) +#define XOR_INT_END_OF_CHAIN BIT(1) +#define XOR_INT_STOPPED BIT(2) +#define XOR_INT_PAUSED BIT(3) +#define XOR_INT_ERR_DECODE BIT(4) +#define XOR_INT_ERR_RDPROT BIT(5) +#define XOR_INT_ERR_WRPROT BIT(6) +#define XOR_INT_ERR_OWN BIT(7) +#define XOR_INT_ERR_PAR BIT(8) +#define XOR_INT_ERR_MBUS BIT(9) + +#define XOR_INTR_ERRORS (XOR_INT_ERR_DECODE | XOR_INT_ERR_RDPROT | \ + XOR_INT_ERR_WRPROT | XOR_INT_ERR_OWN | \ + XOR_INT_ERR_PAR | XOR_INT_ERR_MBUS) + +#define XOR_INTR_MASK_VALUE (XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | \ + XOR_INT_STOPPED | XOR_INTR_ERRORS) + +#define WINDOW_BASE(w) (0x50 + ((w) << 2)) +#define WINDOW_SIZE(w) (0x70 + ((w) << 2)) +#define WINDOW_REMAP_HIGH(w) (0x90 + ((w) << 2)) +#define WINDOW_BAR_ENABLE(chan) (0x40 + ((chan) << 2)) +#define WINDOW_OVERRIDE_CTRL(chan) (0xA0 + ((chan) << 2)) + +struct mv_xor_device { + void __iomem *xor_base; + void __iomem *xor_high_base; + struct clk *clk; + struct mv_xor_chan *channels[MV_XOR_MAX_CHANNELS]; +}; + +/** + * struct mv_xor_chan - internal representation of a XOR channel + * @pending: allows batching of hardware operations + * @lock: serializes enqueue/dequeue operations to the descriptors pool + * @mmr_base: memory mapped register base + * @idx: the index of the xor channel + * @chain: device chain view of the descriptors + * @completed_slots: slots completed by HW but still need to be acked + * @device: parent device + * @common: common dmaengine channel object members + * @last_used: place holder for allocation to continue from where it left off + * @all_slots: complete domain of slots usable by the channel + * @slots_allocated: records the actual size of the descriptor slot pool + * @irq_tasklet: bottom half where mv_xor_slot_cleanup runs + */ +struct mv_xor_chan { + int pending; + spinlock_t lock; /* protects the descriptor slot pool */ + void __iomem *mmr_base; + void __iomem *mmr_high_base; + unsigned int idx; + int irq; + enum dma_transaction_type current_type; + struct list_head chain; + struct list_head completed_slots; + dma_addr_t dma_desc_pool; + void *dma_desc_pool_virt; + size_t pool_size; + struct dma_device dmadev; + struct dma_chan dmachan; + struct mv_xor_desc_slot *last_used; + struct list_head all_slots; + int slots_allocated; + struct tasklet_struct irq_tasklet; + char dummy_src[MV_XOR_MIN_BYTE_COUNT]; + char dummy_dst[MV_XOR_MIN_BYTE_COUNT]; + dma_addr_t dummy_src_addr, dummy_dst_addr; +}; + +/** + * struct mv_xor_desc_slot - software descriptor + * @slot_node: node on the mv_xor_chan.all_slots list + * @chain_node: node on the mv_xor_chan.chain list + * @completed_node: node on the mv_xor_chan.completed_slots list + * @hw_desc: virtual address of the hardware descriptor chain + * @phys: hardware address of the hardware descriptor chain + * @slot_used: slot in use or not + * @idx: pool index + * @tx_list: list of slots that make up a multi-descriptor transaction + * @async_tx: support for the async_tx api + */ +struct mv_xor_desc_slot { + struct list_head slot_node; + struct list_head chain_node; + struct list_head completed_node; + enum dma_transaction_type type; + void *hw_desc; + u16 slot_used; + u16 idx; + struct dma_async_tx_descriptor async_tx; +}; + +/* + * This structure describes XOR descriptor size 64bytes. The + * mv_phy_src_idx() macro must be used when indexing the values of the + * phy_src_addr[] array. This is due to the fact that the 'descriptor + * swap' feature, used on big endian systems, swaps descriptors data + * within blocks of 8 bytes. So two consecutive values of the + * phy_src_addr[] array are actually swapped in big-endian, which + * explains the different mv_phy_src_idx() implementation. + */ +#if defined(__LITTLE_ENDIAN) +struct mv_xor_desc { + u32 status; /* descriptor execution status */ + u32 crc32_result; /* result of CRC-32 calculation */ + u32 desc_command; /* type of operation to be carried out */ + u32 phy_next_desc; /* next descriptor address pointer */ + u32 byte_count; /* size of src/dst blocks in bytes */ + u32 phy_dest_addr; /* destination block address */ + u32 phy_src_addr[8]; /* source block addresses */ + u32 reserved0; + u32 reserved1; +}; +#define mv_phy_src_idx(src_idx) (src_idx) +#else +struct mv_xor_desc { + u32 crc32_result; /* result of CRC-32 calculation */ + u32 status; /* descriptor execution status */ + u32 phy_next_desc; /* next descriptor address pointer */ + u32 desc_command; /* type of operation to be carried out */ + u32 phy_dest_addr; /* destination block address */ + u32 byte_count; /* size of src/dst blocks in bytes */ + u32 phy_src_addr[8]; /* source block addresses */ + u32 reserved1; + u32 reserved0; +}; +#define mv_phy_src_idx(src_idx) (src_idx ^ 1) +#endif + +#define to_mv_sw_desc(addr_hw_desc) \ + container_of(addr_hw_desc, struct mv_xor_desc_slot, hw_desc) + +#define mv_hw_desc_slot_idx(hw_desc, idx) \ + ((void *)(((unsigned long)hw_desc) + ((idx) << 5))) + +#endif diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c new file mode 100644 index 000000000..829ec686d --- /dev/null +++ b/drivers/dma/mxs-dma.c @@ -0,0 +1,887 @@ +/* + * Copyright 2011 Freescale Semiconductor, Inc. All Rights Reserved. + * + * Refer to drivers/dma/imx-sdma.c + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/types.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/clk.h> +#include <linux/wait.h> +#include <linux/sched.h> +#include <linux/semaphore.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/stmp_device.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/list.h> + +#include <asm/irq.h> + +#include "dmaengine.h" + +/* + * NOTE: The term "PIO" throughout the mxs-dma implementation means + * PIO mode of mxs apbh-dma and apbx-dma. With this working mode, + * dma can program the controller registers of peripheral devices. + */ + +#define dma_is_apbh(mxs_dma) ((mxs_dma)->type == MXS_DMA_APBH) +#define apbh_is_old(mxs_dma) ((mxs_dma)->dev_id == IMX23_DMA) + +#define HW_APBHX_CTRL0 0x000 +#define BM_APBH_CTRL0_APB_BURST8_EN (1 << 29) +#define BM_APBH_CTRL0_APB_BURST_EN (1 << 28) +#define BP_APBH_CTRL0_RESET_CHANNEL 16 +#define HW_APBHX_CTRL1 0x010 +#define HW_APBHX_CTRL2 0x020 +#define HW_APBHX_CHANNEL_CTRL 0x030 +#define BP_APBHX_CHANNEL_CTRL_RESET_CHANNEL 16 +/* + * The offset of NXTCMDAR register is different per both dma type and version, + * while stride for each channel is all the same 0x70. + */ +#define HW_APBHX_CHn_NXTCMDAR(d, n) \ + (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x050 : 0x110) + (n) * 0x70) +#define HW_APBHX_CHn_SEMA(d, n) \ + (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x080 : 0x140) + (n) * 0x70) +#define HW_APBHX_CHn_BAR(d, n) \ + (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x070 : 0x130) + (n) * 0x70) +#define HW_APBX_CHn_DEBUG1(d, n) (0x150 + (n) * 0x70) + +/* + * ccw bits definitions + * + * COMMAND: 0..1 (2) + * CHAIN: 2 (1) + * IRQ: 3 (1) + * NAND_LOCK: 4 (1) - not implemented + * NAND_WAIT4READY: 5 (1) - not implemented + * DEC_SEM: 6 (1) + * WAIT4END: 7 (1) + * HALT_ON_TERMINATE: 8 (1) + * TERMINATE_FLUSH: 9 (1) + * RESERVED: 10..11 (2) + * PIO_NUM: 12..15 (4) + */ +#define BP_CCW_COMMAND 0 +#define BM_CCW_COMMAND (3 << 0) +#define CCW_CHAIN (1 << 2) +#define CCW_IRQ (1 << 3) +#define CCW_DEC_SEM (1 << 6) +#define CCW_WAIT4END (1 << 7) +#define CCW_HALT_ON_TERM (1 << 8) +#define CCW_TERM_FLUSH (1 << 9) +#define BP_CCW_PIO_NUM 12 +#define BM_CCW_PIO_NUM (0xf << 12) + +#define BF_CCW(value, field) (((value) << BP_CCW_##field) & BM_CCW_##field) + +#define MXS_DMA_CMD_NO_XFER 0 +#define MXS_DMA_CMD_WRITE 1 +#define MXS_DMA_CMD_READ 2 +#define MXS_DMA_CMD_DMA_SENSE 3 /* not implemented */ + +struct mxs_dma_ccw { + u32 next; + u16 bits; + u16 xfer_bytes; +#define MAX_XFER_BYTES 0xff00 + u32 bufaddr; +#define MXS_PIO_WORDS 16 + u32 pio_words[MXS_PIO_WORDS]; +}; + +#define CCW_BLOCK_SIZE (4 * PAGE_SIZE) +#define NUM_CCW (int)(CCW_BLOCK_SIZE / sizeof(struct mxs_dma_ccw)) + +struct mxs_dma_chan { + struct mxs_dma_engine *mxs_dma; + struct dma_chan chan; + struct dma_async_tx_descriptor desc; + struct tasklet_struct tasklet; + unsigned int chan_irq; + struct mxs_dma_ccw *ccw; + dma_addr_t ccw_phys; + int desc_count; + enum dma_status status; + unsigned int flags; + bool reset; +#define MXS_DMA_SG_LOOP (1 << 0) +#define MXS_DMA_USE_SEMAPHORE (1 << 1) +}; + +#define MXS_DMA_CHANNELS 16 +#define MXS_DMA_CHANNELS_MASK 0xffff + +enum mxs_dma_devtype { + MXS_DMA_APBH, + MXS_DMA_APBX, +}; + +enum mxs_dma_id { + IMX23_DMA, + IMX28_DMA, +}; + +struct mxs_dma_engine { + enum mxs_dma_id dev_id; + enum mxs_dma_devtype type; + void __iomem *base; + struct clk *clk; + struct dma_device dma_device; + struct device_dma_parameters dma_parms; + struct mxs_dma_chan mxs_chans[MXS_DMA_CHANNELS]; + struct platform_device *pdev; + unsigned int nr_channels; +}; + +struct mxs_dma_type { + enum mxs_dma_id id; + enum mxs_dma_devtype type; +}; + +static struct mxs_dma_type mxs_dma_types[] = { + { + .id = IMX23_DMA, + .type = MXS_DMA_APBH, + }, { + .id = IMX23_DMA, + .type = MXS_DMA_APBX, + }, { + .id = IMX28_DMA, + .type = MXS_DMA_APBH, + }, { + .id = IMX28_DMA, + .type = MXS_DMA_APBX, + } +}; + +static struct platform_device_id mxs_dma_ids[] = { + { + .name = "imx23-dma-apbh", + .driver_data = (kernel_ulong_t) &mxs_dma_types[0], + }, { + .name = "imx23-dma-apbx", + .driver_data = (kernel_ulong_t) &mxs_dma_types[1], + }, { + .name = "imx28-dma-apbh", + .driver_data = (kernel_ulong_t) &mxs_dma_types[2], + }, { + .name = "imx28-dma-apbx", + .driver_data = (kernel_ulong_t) &mxs_dma_types[3], + }, { + /* end of list */ + } +}; + +static const struct of_device_id mxs_dma_dt_ids[] = { + { .compatible = "fsl,imx23-dma-apbh", .data = &mxs_dma_ids[0], }, + { .compatible = "fsl,imx23-dma-apbx", .data = &mxs_dma_ids[1], }, + { .compatible = "fsl,imx28-dma-apbh", .data = &mxs_dma_ids[2], }, + { .compatible = "fsl,imx28-dma-apbx", .data = &mxs_dma_ids[3], }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mxs_dma_dt_ids); + +static struct mxs_dma_chan *to_mxs_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct mxs_dma_chan, chan); +} + +static void mxs_dma_reset_chan(struct dma_chan *chan) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + int chan_id = mxs_chan->chan.chan_id; + + /* + * mxs dma channel resets can cause a channel stall. To recover from a + * channel stall, we have to reset the whole DMA engine. To avoid this, + * we use cyclic DMA with semaphores, that are enhanced in + * mxs_dma_int_handler. To reset the channel, we can simply stop writing + * into the semaphore counter. + */ + if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE && + mxs_chan->flags & MXS_DMA_SG_LOOP) { + mxs_chan->reset = true; + } else if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) { + writel(1 << (chan_id + BP_APBH_CTRL0_RESET_CHANNEL), + mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); + } else { + unsigned long elapsed = 0; + const unsigned long max_wait = 50000; /* 50ms */ + void __iomem *reg_dbg1 = mxs_dma->base + + HW_APBX_CHn_DEBUG1(mxs_dma, chan_id); + + /* + * On i.MX28 APBX, the DMA channel can stop working if we reset + * the channel while it is in READ_FLUSH (0x08) state. + * We wait here until we leave the state. Then we trigger the + * reset. Waiting a maximum of 50ms, the kernel shouldn't crash + * because of this. + */ + while ((readl(reg_dbg1) & 0xf) == 0x8 && elapsed < max_wait) { + udelay(100); + elapsed += 100; + } + + if (elapsed >= max_wait) + dev_err(&mxs_chan->mxs_dma->pdev->dev, + "Failed waiting for the DMA channel %d to leave state READ_FLUSH, trying to reset channel in READ_FLUSH state now\n", + chan_id); + + writel(1 << (chan_id + BP_APBHX_CHANNEL_CTRL_RESET_CHANNEL), + mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_SET); + } + + mxs_chan->status = DMA_COMPLETE; +} + +static void mxs_dma_enable_chan(struct dma_chan *chan) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + int chan_id = mxs_chan->chan.chan_id; + + /* set cmd_addr up */ + writel(mxs_chan->ccw_phys, + mxs_dma->base + HW_APBHX_CHn_NXTCMDAR(mxs_dma, chan_id)); + + /* write 1 to SEMA to kick off the channel */ + if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE && + mxs_chan->flags & MXS_DMA_SG_LOOP) { + /* A cyclic DMA consists of at least 2 segments, so initialize + * the semaphore with 2 so we have enough time to add 1 to the + * semaphore if we need to */ + writel(2, mxs_dma->base + HW_APBHX_CHn_SEMA(mxs_dma, chan_id)); + } else { + writel(1, mxs_dma->base + HW_APBHX_CHn_SEMA(mxs_dma, chan_id)); + } + mxs_chan->reset = false; +} + +static void mxs_dma_disable_chan(struct dma_chan *chan) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + + mxs_chan->status = DMA_COMPLETE; +} + +static int mxs_dma_pause_chan(struct dma_chan *chan) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + int chan_id = mxs_chan->chan.chan_id; + + /* freeze the channel */ + if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) + writel(1 << chan_id, + mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); + else + writel(1 << chan_id, + mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_SET); + + mxs_chan->status = DMA_PAUSED; + return 0; +} + +static int mxs_dma_resume_chan(struct dma_chan *chan) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + int chan_id = mxs_chan->chan.chan_id; + + /* unfreeze the channel */ + if (dma_is_apbh(mxs_dma) && apbh_is_old(mxs_dma)) + writel(1 << chan_id, + mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_CLR); + else + writel(1 << chan_id, + mxs_dma->base + HW_APBHX_CHANNEL_CTRL + STMP_OFFSET_REG_CLR); + + mxs_chan->status = DMA_IN_PROGRESS; + return 0; +} + +static dma_cookie_t mxs_dma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + return dma_cookie_assign(tx); +} + +static void mxs_dma_tasklet(unsigned long data) +{ + struct mxs_dma_chan *mxs_chan = (struct mxs_dma_chan *) data; + + if (mxs_chan->desc.callback) + mxs_chan->desc.callback(mxs_chan->desc.callback_param); +} + +static int mxs_dma_irq_to_chan(struct mxs_dma_engine *mxs_dma, int irq) +{ + int i; + + for (i = 0; i != mxs_dma->nr_channels; ++i) + if (mxs_dma->mxs_chans[i].chan_irq == irq) + return i; + + return -EINVAL; +} + +static irqreturn_t mxs_dma_int_handler(int irq, void *dev_id) +{ + struct mxs_dma_engine *mxs_dma = dev_id; + struct mxs_dma_chan *mxs_chan; + u32 completed; + u32 err; + int chan = mxs_dma_irq_to_chan(mxs_dma, irq); + + if (chan < 0) + return IRQ_NONE; + + /* completion status */ + completed = readl(mxs_dma->base + HW_APBHX_CTRL1); + completed = (completed >> chan) & 0x1; + + /* Clear interrupt */ + writel((1 << chan), + mxs_dma->base + HW_APBHX_CTRL1 + STMP_OFFSET_REG_CLR); + + /* error status */ + err = readl(mxs_dma->base + HW_APBHX_CTRL2); + err &= (1 << (MXS_DMA_CHANNELS + chan)) | (1 << chan); + + /* + * error status bit is in the upper 16 bits, error irq bit in the lower + * 16 bits. We transform it into a simpler error code: + * err: 0x00 = no error, 0x01 = TERMINATION, 0x02 = BUS_ERROR + */ + err = (err >> (MXS_DMA_CHANNELS + chan)) + (err >> chan); + + /* Clear error irq */ + writel((1 << chan), + mxs_dma->base + HW_APBHX_CTRL2 + STMP_OFFSET_REG_CLR); + + /* + * When both completion and error of termination bits set at the + * same time, we do not take it as an error. IOW, it only becomes + * an error we need to handle here in case of either it's a bus + * error or a termination error with no completion. 0x01 is termination + * error, so we can subtract err & completed to get the real error case. + */ + err -= err & completed; + + mxs_chan = &mxs_dma->mxs_chans[chan]; + + if (err) { + dev_dbg(mxs_dma->dma_device.dev, + "%s: error in channel %d\n", __func__, + chan); + mxs_chan->status = DMA_ERROR; + mxs_dma_reset_chan(&mxs_chan->chan); + } else if (mxs_chan->status != DMA_COMPLETE) { + if (mxs_chan->flags & MXS_DMA_SG_LOOP) { + mxs_chan->status = DMA_IN_PROGRESS; + if (mxs_chan->flags & MXS_DMA_USE_SEMAPHORE) + writel(1, mxs_dma->base + + HW_APBHX_CHn_SEMA(mxs_dma, chan)); + } else { + mxs_chan->status = DMA_COMPLETE; + } + } + + if (mxs_chan->status == DMA_COMPLETE) { + if (mxs_chan->reset) + return IRQ_HANDLED; + dma_cookie_complete(&mxs_chan->desc); + } + + /* schedule tasklet on this channel */ + tasklet_schedule(&mxs_chan->tasklet); + + return IRQ_HANDLED; +} + +static int mxs_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + int ret; + + mxs_chan->ccw = dma_zalloc_coherent(mxs_dma->dma_device.dev, + CCW_BLOCK_SIZE, + &mxs_chan->ccw_phys, GFP_KERNEL); + if (!mxs_chan->ccw) { + ret = -ENOMEM; + goto err_alloc; + } + + if (mxs_chan->chan_irq != NO_IRQ) { + ret = request_irq(mxs_chan->chan_irq, mxs_dma_int_handler, + 0, "mxs-dma", mxs_dma); + if (ret) + goto err_irq; + } + + ret = clk_prepare_enable(mxs_dma->clk); + if (ret) + goto err_clk; + + mxs_dma_reset_chan(chan); + + dma_async_tx_descriptor_init(&mxs_chan->desc, chan); + mxs_chan->desc.tx_submit = mxs_dma_tx_submit; + + /* the descriptor is ready */ + async_tx_ack(&mxs_chan->desc); + + return 0; + +err_clk: + free_irq(mxs_chan->chan_irq, mxs_dma); +err_irq: + dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, + mxs_chan->ccw, mxs_chan->ccw_phys); +err_alloc: + return ret; +} + +static void mxs_dma_free_chan_resources(struct dma_chan *chan) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + + mxs_dma_disable_chan(chan); + + free_irq(mxs_chan->chan_irq, mxs_dma); + + dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, + mxs_chan->ccw, mxs_chan->ccw_phys); + + clk_disable_unprepare(mxs_dma->clk); +} + +/* + * How to use the flags for ->device_prep_slave_sg() : + * [1] If there is only one DMA command in the DMA chain, the code should be: + * ...... + * ->device_prep_slave_sg(DMA_CTRL_ACK); + * ...... + * [2] If there are two DMA commands in the DMA chain, the code should be + * ...... + * ->device_prep_slave_sg(0); + * ...... + * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + * ...... + * [3] If there are more than two DMA commands in the DMA chain, the code + * should be: + * ...... + * ->device_prep_slave_sg(0); // First + * ...... + * ->device_prep_slave_sg(DMA_PREP_INTERRUPT [| DMA_CTRL_ACK]); + * ...... + * ->device_prep_slave_sg(DMA_PREP_INTERRUPT | DMA_CTRL_ACK); // Last + * ...... + */ +static struct dma_async_tx_descriptor *mxs_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + struct mxs_dma_ccw *ccw; + struct scatterlist *sg; + u32 i, j; + u32 *pio; + bool append = flags & DMA_PREP_INTERRUPT; + int idx = append ? mxs_chan->desc_count : 0; + + if (mxs_chan->status == DMA_IN_PROGRESS && !append) + return NULL; + + if (sg_len + (append ? idx : 0) > NUM_CCW) { + dev_err(mxs_dma->dma_device.dev, + "maximum number of sg exceeded: %d > %d\n", + sg_len, NUM_CCW); + goto err_out; + } + + mxs_chan->status = DMA_IN_PROGRESS; + mxs_chan->flags = 0; + + /* + * If the sg is prepared with append flag set, the sg + * will be appended to the last prepared sg. + */ + if (append) { + BUG_ON(idx < 1); + ccw = &mxs_chan->ccw[idx - 1]; + ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * idx; + ccw->bits |= CCW_CHAIN; + ccw->bits &= ~CCW_IRQ; + ccw->bits &= ~CCW_DEC_SEM; + } else { + idx = 0; + } + + if (direction == DMA_TRANS_NONE) { + ccw = &mxs_chan->ccw[idx++]; + pio = (u32 *) sgl; + + for (j = 0; j < sg_len;) + ccw->pio_words[j++] = *pio++; + + ccw->bits = 0; + ccw->bits |= CCW_IRQ; + ccw->bits |= CCW_DEC_SEM; + if (flags & DMA_CTRL_ACK) + ccw->bits |= CCW_WAIT4END; + ccw->bits |= CCW_HALT_ON_TERM; + ccw->bits |= CCW_TERM_FLUSH; + ccw->bits |= BF_CCW(sg_len, PIO_NUM); + ccw->bits |= BF_CCW(MXS_DMA_CMD_NO_XFER, COMMAND); + } else { + for_each_sg(sgl, sg, sg_len, i) { + if (sg_dma_len(sg) > MAX_XFER_BYTES) { + dev_err(mxs_dma->dma_device.dev, "maximum bytes for sg entry exceeded: %d > %d\n", + sg_dma_len(sg), MAX_XFER_BYTES); + goto err_out; + } + + ccw = &mxs_chan->ccw[idx++]; + + ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * idx; + ccw->bufaddr = sg->dma_address; + ccw->xfer_bytes = sg_dma_len(sg); + + ccw->bits = 0; + ccw->bits |= CCW_CHAIN; + ccw->bits |= CCW_HALT_ON_TERM; + ccw->bits |= CCW_TERM_FLUSH; + ccw->bits |= BF_CCW(direction == DMA_DEV_TO_MEM ? + MXS_DMA_CMD_WRITE : MXS_DMA_CMD_READ, + COMMAND); + + if (i + 1 == sg_len) { + ccw->bits &= ~CCW_CHAIN; + ccw->bits |= CCW_IRQ; + ccw->bits |= CCW_DEC_SEM; + if (flags & DMA_CTRL_ACK) + ccw->bits |= CCW_WAIT4END; + } + } + } + mxs_chan->desc_count = idx; + + return &mxs_chan->desc; + +err_out: + mxs_chan->status = DMA_ERROR; + return NULL; +} + +static struct dma_async_tx_descriptor *mxs_dma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + u32 num_periods = buf_len / period_len; + u32 i = 0, buf = 0; + + if (mxs_chan->status == DMA_IN_PROGRESS) + return NULL; + + mxs_chan->status = DMA_IN_PROGRESS; + mxs_chan->flags |= MXS_DMA_SG_LOOP; + mxs_chan->flags |= MXS_DMA_USE_SEMAPHORE; + + if (num_periods > NUM_CCW) { + dev_err(mxs_dma->dma_device.dev, + "maximum number of sg exceeded: %d > %d\n", + num_periods, NUM_CCW); + goto err_out; + } + + if (period_len > MAX_XFER_BYTES) { + dev_err(mxs_dma->dma_device.dev, + "maximum period size exceeded: %d > %d\n", + period_len, MAX_XFER_BYTES); + goto err_out; + } + + while (buf < buf_len) { + struct mxs_dma_ccw *ccw = &mxs_chan->ccw[i]; + + if (i + 1 == num_periods) + ccw->next = mxs_chan->ccw_phys; + else + ccw->next = mxs_chan->ccw_phys + sizeof(*ccw) * (i + 1); + + ccw->bufaddr = dma_addr; + ccw->xfer_bytes = period_len; + + ccw->bits = 0; + ccw->bits |= CCW_CHAIN; + ccw->bits |= CCW_IRQ; + ccw->bits |= CCW_HALT_ON_TERM; + ccw->bits |= CCW_TERM_FLUSH; + ccw->bits |= CCW_DEC_SEM; + ccw->bits |= BF_CCW(direction == DMA_DEV_TO_MEM ? + MXS_DMA_CMD_WRITE : MXS_DMA_CMD_READ, COMMAND); + + dma_addr += period_len; + buf += period_len; + + i++; + } + mxs_chan->desc_count = i; + + return &mxs_chan->desc; + +err_out: + mxs_chan->status = DMA_ERROR; + return NULL; +} + +static int mxs_dma_terminate_all(struct dma_chan *chan) +{ + mxs_dma_reset_chan(chan); + mxs_dma_disable_chan(chan); + + return 0; +} + +static enum dma_status mxs_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + u32 residue = 0; + + if (mxs_chan->status == DMA_IN_PROGRESS && + mxs_chan->flags & MXS_DMA_SG_LOOP) { + struct mxs_dma_ccw *last_ccw; + u32 bar; + + last_ccw = &mxs_chan->ccw[mxs_chan->desc_count - 1]; + residue = last_ccw->xfer_bytes + last_ccw->bufaddr; + + bar = readl(mxs_dma->base + + HW_APBHX_CHn_BAR(mxs_dma, chan->chan_id)); + residue -= bar; + } + + dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, + residue); + + return mxs_chan->status; +} + +static int __init mxs_dma_init(struct mxs_dma_engine *mxs_dma) +{ + int ret; + + ret = clk_prepare_enable(mxs_dma->clk); + if (ret) + return ret; + + ret = stmp_reset_block(mxs_dma->base); + if (ret) + goto err_out; + + /* enable apbh burst */ + if (dma_is_apbh(mxs_dma)) { + writel(BM_APBH_CTRL0_APB_BURST_EN, + mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); + writel(BM_APBH_CTRL0_APB_BURST8_EN, + mxs_dma->base + HW_APBHX_CTRL0 + STMP_OFFSET_REG_SET); + } + + /* enable irq for all the channels */ + writel(MXS_DMA_CHANNELS_MASK << MXS_DMA_CHANNELS, + mxs_dma->base + HW_APBHX_CTRL1 + STMP_OFFSET_REG_SET); + +err_out: + clk_disable_unprepare(mxs_dma->clk); + return ret; +} + +struct mxs_dma_filter_param { + struct device_node *of_node; + unsigned int chan_id; +}; + +static bool mxs_dma_filter_fn(struct dma_chan *chan, void *fn_param) +{ + struct mxs_dma_filter_param *param = fn_param; + struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + int chan_irq; + + if (mxs_dma->dma_device.dev->of_node != param->of_node) + return false; + + if (chan->chan_id != param->chan_id) + return false; + + chan_irq = platform_get_irq(mxs_dma->pdev, param->chan_id); + if (chan_irq < 0) + return false; + + mxs_chan->chan_irq = chan_irq; + + return true; +} + +static struct dma_chan *mxs_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct mxs_dma_engine *mxs_dma = ofdma->of_dma_data; + dma_cap_mask_t mask = mxs_dma->dma_device.cap_mask; + struct mxs_dma_filter_param param; + + if (dma_spec->args_count != 1) + return NULL; + + param.of_node = ofdma->of_node; + param.chan_id = dma_spec->args[0]; + + if (param.chan_id >= mxs_dma->nr_channels) + return NULL; + + return dma_request_channel(mask, mxs_dma_filter_fn, ¶m); +} + +static int __init mxs_dma_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + const struct platform_device_id *id_entry; + const struct of_device_id *of_id; + const struct mxs_dma_type *dma_type; + struct mxs_dma_engine *mxs_dma; + struct resource *iores; + int ret, i; + + mxs_dma = devm_kzalloc(&pdev->dev, sizeof(*mxs_dma), GFP_KERNEL); + if (!mxs_dma) + return -ENOMEM; + + ret = of_property_read_u32(np, "dma-channels", &mxs_dma->nr_channels); + if (ret) { + dev_err(&pdev->dev, "failed to read dma-channels\n"); + return ret; + } + + of_id = of_match_device(mxs_dma_dt_ids, &pdev->dev); + if (of_id) + id_entry = of_id->data; + else + id_entry = platform_get_device_id(pdev); + + dma_type = (struct mxs_dma_type *)id_entry->driver_data; + mxs_dma->type = dma_type->type; + mxs_dma->dev_id = dma_type->id; + + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + mxs_dma->base = devm_ioremap_resource(&pdev->dev, iores); + if (IS_ERR(mxs_dma->base)) + return PTR_ERR(mxs_dma->base); + + mxs_dma->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(mxs_dma->clk)) + return PTR_ERR(mxs_dma->clk); + + dma_cap_set(DMA_SLAVE, mxs_dma->dma_device.cap_mask); + dma_cap_set(DMA_CYCLIC, mxs_dma->dma_device.cap_mask); + + INIT_LIST_HEAD(&mxs_dma->dma_device.channels); + + /* Initialize channel parameters */ + for (i = 0; i < MXS_DMA_CHANNELS; i++) { + struct mxs_dma_chan *mxs_chan = &mxs_dma->mxs_chans[i]; + + mxs_chan->mxs_dma = mxs_dma; + mxs_chan->chan.device = &mxs_dma->dma_device; + dma_cookie_init(&mxs_chan->chan); + + tasklet_init(&mxs_chan->tasklet, mxs_dma_tasklet, + (unsigned long) mxs_chan); + + + /* Add the channel to mxs_chan list */ + list_add_tail(&mxs_chan->chan.device_node, + &mxs_dma->dma_device.channels); + } + + ret = mxs_dma_init(mxs_dma); + if (ret) + return ret; + + mxs_dma->pdev = pdev; + mxs_dma->dma_device.dev = &pdev->dev; + + /* mxs_dma gets 65535 bytes maximum sg size */ + mxs_dma->dma_device.dev->dma_parms = &mxs_dma->dma_parms; + dma_set_max_seg_size(mxs_dma->dma_device.dev, MAX_XFER_BYTES); + + mxs_dma->dma_device.device_alloc_chan_resources = mxs_dma_alloc_chan_resources; + mxs_dma->dma_device.device_free_chan_resources = mxs_dma_free_chan_resources; + mxs_dma->dma_device.device_tx_status = mxs_dma_tx_status; + mxs_dma->dma_device.device_prep_slave_sg = mxs_dma_prep_slave_sg; + mxs_dma->dma_device.device_prep_dma_cyclic = mxs_dma_prep_dma_cyclic; + mxs_dma->dma_device.device_pause = mxs_dma_pause_chan; + mxs_dma->dma_device.device_resume = mxs_dma_resume_chan; + mxs_dma->dma_device.device_terminate_all = mxs_dma_terminate_all; + mxs_dma->dma_device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + mxs_dma->dma_device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + mxs_dma->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + mxs_dma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + mxs_dma->dma_device.device_issue_pending = mxs_dma_enable_chan; + + ret = dma_async_device_register(&mxs_dma->dma_device); + if (ret) { + dev_err(mxs_dma->dma_device.dev, "unable to register\n"); + return ret; + } + + ret = of_dma_controller_register(np, mxs_dma_xlate, mxs_dma); + if (ret) { + dev_err(mxs_dma->dma_device.dev, + "failed to register controller\n"); + dma_async_device_unregister(&mxs_dma->dma_device); + } + + dev_info(mxs_dma->dma_device.dev, "initialized\n"); + + return 0; +} + +static struct platform_driver mxs_dma_driver = { + .driver = { + .name = "mxs-dma", + .of_match_table = mxs_dma_dt_ids, + }, + .id_table = mxs_dma_ids, +}; + +static int __init mxs_dma_module_init(void) +{ + return platform_driver_probe(&mxs_dma_driver, mxs_dma_probe); +} +subsys_initcall(mxs_dma_module_init); diff --git a/drivers/dma/nbpfaxi.c b/drivers/dma/nbpfaxi.c new file mode 100644 index 000000000..88b77c983 --- /dev/null +++ b/drivers/dma/nbpfaxi.c @@ -0,0 +1,1506 @@ +/* + * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd. + * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/bitmap.h> +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/err.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/log2.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <dt-bindings/dma/nbpfaxi.h> + +#include "dmaengine.h" + +#define NBPF_REG_CHAN_OFFSET 0 +#define NBPF_REG_CHAN_SIZE 0x40 + +/* Channel Current Transaction Byte register */ +#define NBPF_CHAN_CUR_TR_BYTE 0x20 + +/* Channel Status register */ +#define NBPF_CHAN_STAT 0x24 +#define NBPF_CHAN_STAT_EN 1 +#define NBPF_CHAN_STAT_TACT 4 +#define NBPF_CHAN_STAT_ERR 0x10 +#define NBPF_CHAN_STAT_END 0x20 +#define NBPF_CHAN_STAT_TC 0x40 +#define NBPF_CHAN_STAT_DER 0x400 + +/* Channel Control register */ +#define NBPF_CHAN_CTRL 0x28 +#define NBPF_CHAN_CTRL_SETEN 1 +#define NBPF_CHAN_CTRL_CLREN 2 +#define NBPF_CHAN_CTRL_STG 4 +#define NBPF_CHAN_CTRL_SWRST 8 +#define NBPF_CHAN_CTRL_CLRRQ 0x10 +#define NBPF_CHAN_CTRL_CLREND 0x20 +#define NBPF_CHAN_CTRL_CLRTC 0x40 +#define NBPF_CHAN_CTRL_SETSUS 0x100 +#define NBPF_CHAN_CTRL_CLRSUS 0x200 + +/* Channel Configuration register */ +#define NBPF_CHAN_CFG 0x2c +#define NBPF_CHAN_CFG_SEL 7 /* terminal SELect: 0..7 */ +#define NBPF_CHAN_CFG_REQD 8 /* REQuest Direction: DMAREQ is 0: input, 1: output */ +#define NBPF_CHAN_CFG_LOEN 0x10 /* LOw ENable: low DMA request line is: 0: inactive, 1: active */ +#define NBPF_CHAN_CFG_HIEN 0x20 /* HIgh ENable: high DMA request line is: 0: inactive, 1: active */ +#define NBPF_CHAN_CFG_LVL 0x40 /* LeVeL: DMA request line is sensed as 0: edge, 1: level */ +#define NBPF_CHAN_CFG_AM 0x700 /* ACK Mode: 0: Pulse mode, 1: Level mode, b'1x: Bus Cycle */ +#define NBPF_CHAN_CFG_SDS 0xf000 /* Source Data Size: 0: 8 bits,... , 7: 1024 bits */ +#define NBPF_CHAN_CFG_DDS 0xf0000 /* Destination Data Size: as above */ +#define NBPF_CHAN_CFG_SAD 0x100000 /* Source ADdress counting: 0: increment, 1: fixed */ +#define NBPF_CHAN_CFG_DAD 0x200000 /* Destination ADdress counting: 0: increment, 1: fixed */ +#define NBPF_CHAN_CFG_TM 0x400000 /* Transfer Mode: 0: single, 1: block TM */ +#define NBPF_CHAN_CFG_DEM 0x1000000 /* DMAEND interrupt Mask */ +#define NBPF_CHAN_CFG_TCM 0x2000000 /* DMATCO interrupt Mask */ +#define NBPF_CHAN_CFG_SBE 0x8000000 /* Sweep Buffer Enable */ +#define NBPF_CHAN_CFG_RSEL 0x10000000 /* RM: Register Set sELect */ +#define NBPF_CHAN_CFG_RSW 0x20000000 /* RM: Register Select sWitch */ +#define NBPF_CHAN_CFG_REN 0x40000000 /* RM: Register Set Enable */ +#define NBPF_CHAN_CFG_DMS 0x80000000 /* 0: register mode (RM), 1: link mode (LM) */ + +#define NBPF_CHAN_NXLA 0x38 +#define NBPF_CHAN_CRLA 0x3c + +/* Link Header field */ +#define NBPF_HEADER_LV 1 +#define NBPF_HEADER_LE 2 +#define NBPF_HEADER_WBD 4 +#define NBPF_HEADER_DIM 8 + +#define NBPF_CTRL 0x300 +#define NBPF_CTRL_PR 1 /* 0: fixed priority, 1: round robin */ +#define NBPF_CTRL_LVINT 2 /* DMAEND and DMAERR signalling: 0: pulse, 1: level */ + +#define NBPF_DSTAT_ER 0x314 +#define NBPF_DSTAT_END 0x318 + +#define NBPF_DMA_BUSWIDTHS \ + (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) + +struct nbpf_config { + int num_channels; + int buffer_size; +}; + +/* + * We've got 3 types of objects, used to describe DMA transfers: + * 1. high-level descriptor, containing a struct dma_async_tx_descriptor object + * in it, used to communicate with the user + * 2. hardware DMA link descriptors, that we pass to DMAC for DMA transfer + * queuing, these must be DMAable, using either the streaming DMA API or + * allocated from coherent memory - one per SG segment + * 3. one per SG segment descriptors, used to manage HW link descriptors from + * (2). They do not have to be DMAable. They can either be (a) allocated + * together with link descriptors as mixed (DMA / CPU) objects, or (b) + * separately. Even if allocated separately it would be best to link them + * to link descriptors once during channel resource allocation and always + * use them as a single object. + * Therefore for both cases (a) and (b) at run-time objects (2) and (3) shall be + * treated as a single SG segment descriptor. + */ + +struct nbpf_link_reg { + u32 header; + u32 src_addr; + u32 dst_addr; + u32 transaction_size; + u32 config; + u32 interval; + u32 extension; + u32 next; +} __packed; + +struct nbpf_device; +struct nbpf_channel; +struct nbpf_desc; + +struct nbpf_link_desc { + struct nbpf_link_reg *hwdesc; + dma_addr_t hwdesc_dma_addr; + struct nbpf_desc *desc; + struct list_head node; +}; + +/** + * struct nbpf_desc - DMA transfer descriptor + * @async_tx: dmaengine object + * @user_wait: waiting for a user ack + * @length: total transfer length + * @sg: list of hardware descriptors, represented by struct nbpf_link_desc + * @node: member in channel descriptor lists + */ +struct nbpf_desc { + struct dma_async_tx_descriptor async_tx; + bool user_wait; + size_t length; + struct nbpf_channel *chan; + struct list_head sg; + struct list_head node; +}; + +/* Take a wild guess: allocate 4 segments per descriptor */ +#define NBPF_SEGMENTS_PER_DESC 4 +#define NBPF_DESCS_PER_PAGE ((PAGE_SIZE - sizeof(struct list_head)) / \ + (sizeof(struct nbpf_desc) + \ + NBPF_SEGMENTS_PER_DESC * \ + (sizeof(struct nbpf_link_desc) + sizeof(struct nbpf_link_reg)))) +#define NBPF_SEGMENTS_PER_PAGE (NBPF_SEGMENTS_PER_DESC * NBPF_DESCS_PER_PAGE) + +struct nbpf_desc_page { + struct list_head node; + struct nbpf_desc desc[NBPF_DESCS_PER_PAGE]; + struct nbpf_link_desc ldesc[NBPF_SEGMENTS_PER_PAGE]; + struct nbpf_link_reg hwdesc[NBPF_SEGMENTS_PER_PAGE]; +}; + +/** + * struct nbpf_channel - one DMAC channel + * @dma_chan: standard dmaengine channel object + * @base: register address base + * @nbpf: DMAC + * @name: IRQ name + * @irq: IRQ number + * @slave_addr: address for slave DMA + * @slave_width:slave data size in bytes + * @slave_burst:maximum slave burst size in bytes + * @terminal: DMA terminal, assigned to this channel + * @dmarq_cfg: DMA request line configuration - high / low, edge / level for NBPF_CHAN_CFG + * @flags: configuration flags from DT + * @lock: protect descriptor lists + * @free_links: list of free link descriptors + * @free: list of free descriptors + * @queued: list of queued descriptors + * @active: list of descriptors, scheduled for processing + * @done: list of completed descriptors, waiting post-processing + * @desc_page: list of additionally allocated descriptor pages - if any + */ +struct nbpf_channel { + struct dma_chan dma_chan; + struct tasklet_struct tasklet; + void __iomem *base; + struct nbpf_device *nbpf; + char name[16]; + int irq; + dma_addr_t slave_src_addr; + size_t slave_src_width; + size_t slave_src_burst; + dma_addr_t slave_dst_addr; + size_t slave_dst_width; + size_t slave_dst_burst; + unsigned int terminal; + u32 dmarq_cfg; + unsigned long flags; + spinlock_t lock; + struct list_head free_links; + struct list_head free; + struct list_head queued; + struct list_head active; + struct list_head done; + struct list_head desc_page; + struct nbpf_desc *running; + bool paused; +}; + +struct nbpf_device { + struct dma_device dma_dev; + void __iomem *base; + struct clk *clk; + const struct nbpf_config *config; + struct nbpf_channel chan[]; +}; + +enum nbpf_model { + NBPF1B4, + NBPF1B8, + NBPF1B16, + NBPF4B4, + NBPF4B8, + NBPF4B16, + NBPF8B4, + NBPF8B8, + NBPF8B16, +}; + +static struct nbpf_config nbpf_cfg[] = { + [NBPF1B4] = { + .num_channels = 1, + .buffer_size = 4, + }, + [NBPF1B8] = { + .num_channels = 1, + .buffer_size = 8, + }, + [NBPF1B16] = { + .num_channels = 1, + .buffer_size = 16, + }, + [NBPF4B4] = { + .num_channels = 4, + .buffer_size = 4, + }, + [NBPF4B8] = { + .num_channels = 4, + .buffer_size = 8, + }, + [NBPF4B16] = { + .num_channels = 4, + .buffer_size = 16, + }, + [NBPF8B4] = { + .num_channels = 8, + .buffer_size = 4, + }, + [NBPF8B8] = { + .num_channels = 8, + .buffer_size = 8, + }, + [NBPF8B16] = { + .num_channels = 8, + .buffer_size = 16, + }, +}; + +#define nbpf_to_chan(d) container_of(d, struct nbpf_channel, dma_chan) + +/* + * dmaengine drivers seem to have a lot in common and instead of sharing more + * code, they reimplement those common algorithms independently. In this driver + * we try to separate the hardware-specific part from the (largely) generic + * part. This improves code readability and makes it possible in the future to + * reuse the generic code in form of a helper library. That generic code should + * be suitable for various DMA controllers, using transfer descriptors in RAM + * and pushing one SG list at a time to the DMA controller. + */ + +/* Hardware-specific part */ + +static inline u32 nbpf_chan_read(struct nbpf_channel *chan, + unsigned int offset) +{ + u32 data = ioread32(chan->base + offset); + dev_dbg(chan->dma_chan.device->dev, "%s(0x%p + 0x%x) = 0x%x\n", + __func__, chan->base, offset, data); + return data; +} + +static inline void nbpf_chan_write(struct nbpf_channel *chan, + unsigned int offset, u32 data) +{ + iowrite32(data, chan->base + offset); + dev_dbg(chan->dma_chan.device->dev, "%s(0x%p + 0x%x) = 0x%x\n", + __func__, chan->base, offset, data); +} + +static inline u32 nbpf_read(struct nbpf_device *nbpf, + unsigned int offset) +{ + u32 data = ioread32(nbpf->base + offset); + dev_dbg(nbpf->dma_dev.dev, "%s(0x%p + 0x%x) = 0x%x\n", + __func__, nbpf->base, offset, data); + return data; +} + +static inline void nbpf_write(struct nbpf_device *nbpf, + unsigned int offset, u32 data) +{ + iowrite32(data, nbpf->base + offset); + dev_dbg(nbpf->dma_dev.dev, "%s(0x%p + 0x%x) = 0x%x\n", + __func__, nbpf->base, offset, data); +} + +static void nbpf_chan_halt(struct nbpf_channel *chan) +{ + nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_CLREN); +} + +static bool nbpf_status_get(struct nbpf_channel *chan) +{ + u32 status = nbpf_read(chan->nbpf, NBPF_DSTAT_END); + + return status & BIT(chan - chan->nbpf->chan); +} + +static void nbpf_status_ack(struct nbpf_channel *chan) +{ + nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_CLREND); +} + +static u32 nbpf_error_get(struct nbpf_device *nbpf) +{ + return nbpf_read(nbpf, NBPF_DSTAT_ER); +} + +static struct nbpf_channel *nbpf_error_get_channel(struct nbpf_device *nbpf, u32 error) +{ + return nbpf->chan + __ffs(error); +} + +static void nbpf_error_clear(struct nbpf_channel *chan) +{ + u32 status; + int i; + + /* Stop the channel, make sure DMA has been aborted */ + nbpf_chan_halt(chan); + + for (i = 1000; i; i--) { + status = nbpf_chan_read(chan, NBPF_CHAN_STAT); + if (!(status & NBPF_CHAN_STAT_TACT)) + break; + cpu_relax(); + } + + if (!i) + dev_err(chan->dma_chan.device->dev, + "%s(): abort timeout, channel status 0x%x\n", __func__, status); + + nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_SWRST); +} + +static int nbpf_start(struct nbpf_desc *desc) +{ + struct nbpf_channel *chan = desc->chan; + struct nbpf_link_desc *ldesc = list_first_entry(&desc->sg, struct nbpf_link_desc, node); + + nbpf_chan_write(chan, NBPF_CHAN_NXLA, (u32)ldesc->hwdesc_dma_addr); + nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_SETEN | NBPF_CHAN_CTRL_CLRSUS); + chan->paused = false; + + /* Software trigger MEMCPY - only MEMCPY uses the block mode */ + if (ldesc->hwdesc->config & NBPF_CHAN_CFG_TM) + nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_STG); + + dev_dbg(chan->nbpf->dma_dev.dev, "%s(): next 0x%x, cur 0x%x\n", __func__, + nbpf_chan_read(chan, NBPF_CHAN_NXLA), nbpf_chan_read(chan, NBPF_CHAN_CRLA)); + + return 0; +} + +static void nbpf_chan_prepare(struct nbpf_channel *chan) +{ + chan->dmarq_cfg = (chan->flags & NBPF_SLAVE_RQ_HIGH ? NBPF_CHAN_CFG_HIEN : 0) | + (chan->flags & NBPF_SLAVE_RQ_LOW ? NBPF_CHAN_CFG_LOEN : 0) | + (chan->flags & NBPF_SLAVE_RQ_LEVEL ? + NBPF_CHAN_CFG_LVL | (NBPF_CHAN_CFG_AM & 0x200) : 0) | + chan->terminal; +} + +static void nbpf_chan_prepare_default(struct nbpf_channel *chan) +{ + /* Don't output DMAACK */ + chan->dmarq_cfg = NBPF_CHAN_CFG_AM & 0x400; + chan->terminal = 0; + chan->flags = 0; +} + +static void nbpf_chan_configure(struct nbpf_channel *chan) +{ + /* + * We assume, that only the link mode and DMA request line configuration + * have to be set in the configuration register manually. Dynamic + * per-transfer configuration will be loaded from transfer descriptors. + */ + nbpf_chan_write(chan, NBPF_CHAN_CFG, NBPF_CHAN_CFG_DMS | chan->dmarq_cfg); +} + +static u32 nbpf_xfer_ds(struct nbpf_device *nbpf, size_t size) +{ + /* Maximum supported bursts depend on the buffer size */ + return min_t(int, __ffs(size), ilog2(nbpf->config->buffer_size * 8)); +} + +static size_t nbpf_xfer_size(struct nbpf_device *nbpf, + enum dma_slave_buswidth width, u32 burst) +{ + size_t size; + + if (!burst) + burst = 1; + + switch (width) { + case DMA_SLAVE_BUSWIDTH_8_BYTES: + size = 8 * burst; + break; + + case DMA_SLAVE_BUSWIDTH_4_BYTES: + size = 4 * burst; + break; + + case DMA_SLAVE_BUSWIDTH_2_BYTES: + size = 2 * burst; + break; + + default: + pr_warn("%s(): invalid bus width %u\n", __func__, width); + case DMA_SLAVE_BUSWIDTH_1_BYTE: + size = burst; + } + + return nbpf_xfer_ds(nbpf, size); +} + +/* + * We need a way to recognise slaves, whose data is sent "raw" over the bus, + * i.e. it isn't known in advance how many bytes will be received. Therefore + * the slave driver has to provide a "large enough" buffer and either read the + * buffer, when it is full, or detect, that some data has arrived, then wait for + * a timeout, if no more data arrives - receive what's already there. We want to + * handle such slaves in a special way to allow an optimised mode for other + * users, for whom the amount of data is known in advance. So far there's no way + * to recognise such slaves. We use a data-width check to distinguish between + * the SD host and the PL011 UART. + */ + +static int nbpf_prep_one(struct nbpf_link_desc *ldesc, + enum dma_transfer_direction direction, + dma_addr_t src, dma_addr_t dst, size_t size, bool last) +{ + struct nbpf_link_reg *hwdesc = ldesc->hwdesc; + struct nbpf_desc *desc = ldesc->desc; + struct nbpf_channel *chan = desc->chan; + struct device *dev = chan->dma_chan.device->dev; + size_t mem_xfer, slave_xfer; + bool can_burst; + + hwdesc->header = NBPF_HEADER_WBD | NBPF_HEADER_LV | + (last ? NBPF_HEADER_LE : 0); + + hwdesc->src_addr = src; + hwdesc->dst_addr = dst; + hwdesc->transaction_size = size; + + /* + * set config: SAD, DAD, DDS, SDS, etc. + * Note on transfer sizes: the DMAC can perform unaligned DMA transfers, + * but it is important to have transaction size a multiple of both + * receiver and transmitter transfer sizes. It is also possible to use + * different RAM and device transfer sizes, and it does work well with + * some devices, e.g. with V08R07S01E SD host controllers, which can use + * 128 byte transfers. But this doesn't work with other devices, + * especially when the transaction size is unknown. This is the case, + * e.g. with serial drivers like amba-pl011.c. For reception it sets up + * the transaction size of 4K and if fewer bytes are received, it + * pauses DMA and reads out data received via DMA as well as those left + * in the Rx FIFO. For this to work with the RAM side using burst + * transfers we enable the SBE bit and terminate the transfer in our + * .device_pause handler. + */ + mem_xfer = nbpf_xfer_ds(chan->nbpf, size); + + switch (direction) { + case DMA_DEV_TO_MEM: + can_burst = chan->slave_src_width >= 3; + slave_xfer = min(mem_xfer, can_burst ? + chan->slave_src_burst : chan->slave_src_width); + /* + * Is the slave narrower than 64 bits, i.e. isn't using the full + * bus width and cannot use bursts? + */ + if (mem_xfer > chan->slave_src_burst && !can_burst) + mem_xfer = chan->slave_src_burst; + /* Device-to-RAM DMA is unreliable without REQD set */ + hwdesc->config = NBPF_CHAN_CFG_SAD | (NBPF_CHAN_CFG_DDS & (mem_xfer << 16)) | + (NBPF_CHAN_CFG_SDS & (slave_xfer << 12)) | NBPF_CHAN_CFG_REQD | + NBPF_CHAN_CFG_SBE; + break; + + case DMA_MEM_TO_DEV: + slave_xfer = min(mem_xfer, chan->slave_dst_width >= 3 ? + chan->slave_dst_burst : chan->slave_dst_width); + hwdesc->config = NBPF_CHAN_CFG_DAD | (NBPF_CHAN_CFG_SDS & (mem_xfer << 12)) | + (NBPF_CHAN_CFG_DDS & (slave_xfer << 16)) | NBPF_CHAN_CFG_REQD; + break; + + case DMA_MEM_TO_MEM: + hwdesc->config = NBPF_CHAN_CFG_TCM | NBPF_CHAN_CFG_TM | + (NBPF_CHAN_CFG_SDS & (mem_xfer << 12)) | + (NBPF_CHAN_CFG_DDS & (mem_xfer << 16)); + break; + + default: + return -EINVAL; + } + + hwdesc->config |= chan->dmarq_cfg | (last ? 0 : NBPF_CHAN_CFG_DEM) | + NBPF_CHAN_CFG_DMS; + + dev_dbg(dev, "%s(): desc @ %pad: hdr 0x%x, cfg 0x%x, %zu @ %pad -> %pad\n", + __func__, &ldesc->hwdesc_dma_addr, hwdesc->header, + hwdesc->config, size, &src, &dst); + + dma_sync_single_for_device(dev, ldesc->hwdesc_dma_addr, sizeof(*hwdesc), + DMA_TO_DEVICE); + + return 0; +} + +static size_t nbpf_bytes_left(struct nbpf_channel *chan) +{ + return nbpf_chan_read(chan, NBPF_CHAN_CUR_TR_BYTE); +} + +static void nbpf_configure(struct nbpf_device *nbpf) +{ + nbpf_write(nbpf, NBPF_CTRL, NBPF_CTRL_LVINT); +} + +/* Generic part */ + +/* DMA ENGINE functions */ +static void nbpf_issue_pending(struct dma_chan *dchan) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + unsigned long flags; + + dev_dbg(dchan->device->dev, "Entry %s()\n", __func__); + + spin_lock_irqsave(&chan->lock, flags); + if (list_empty(&chan->queued)) + goto unlock; + + list_splice_tail_init(&chan->queued, &chan->active); + + if (!chan->running) { + struct nbpf_desc *desc = list_first_entry(&chan->active, + struct nbpf_desc, node); + if (!nbpf_start(desc)) + chan->running = desc; + } + +unlock: + spin_unlock_irqrestore(&chan->lock, flags); +} + +static enum dma_status nbpf_tx_status(struct dma_chan *dchan, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + enum dma_status status = dma_cookie_status(dchan, cookie, state); + + if (state) { + dma_cookie_t running; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + running = chan->running ? chan->running->async_tx.cookie : -EINVAL; + + if (cookie == running) { + state->residue = nbpf_bytes_left(chan); + dev_dbg(dchan->device->dev, "%s(): residue %u\n", __func__, + state->residue); + } else if (status == DMA_IN_PROGRESS) { + struct nbpf_desc *desc; + bool found = false; + + list_for_each_entry(desc, &chan->active, node) + if (desc->async_tx.cookie == cookie) { + found = true; + break; + } + + if (!found) + list_for_each_entry(desc, &chan->queued, node) + if (desc->async_tx.cookie == cookie) { + found = true; + break; + + } + + state->residue = found ? desc->length : 0; + } + + spin_unlock_irqrestore(&chan->lock, flags); + } + + if (chan->paused) + status = DMA_PAUSED; + + return status; +} + +static dma_cookie_t nbpf_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct nbpf_desc *desc = container_of(tx, struct nbpf_desc, async_tx); + struct nbpf_channel *chan = desc->chan; + unsigned long flags; + dma_cookie_t cookie; + + spin_lock_irqsave(&chan->lock, flags); + cookie = dma_cookie_assign(tx); + list_add_tail(&desc->node, &chan->queued); + spin_unlock_irqrestore(&chan->lock, flags); + + dev_dbg(chan->dma_chan.device->dev, "Entry %s(%d)\n", __func__, cookie); + + return cookie; +} + +static int nbpf_desc_page_alloc(struct nbpf_channel *chan) +{ + struct dma_chan *dchan = &chan->dma_chan; + struct nbpf_desc_page *dpage = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA); + struct nbpf_link_desc *ldesc; + struct nbpf_link_reg *hwdesc; + struct nbpf_desc *desc; + LIST_HEAD(head); + LIST_HEAD(lhead); + int i; + struct device *dev = dchan->device->dev; + + if (!dpage) + return -ENOMEM; + + dev_dbg(dev, "%s(): alloc %lu descriptors, %lu segments, total alloc %zu\n", + __func__, NBPF_DESCS_PER_PAGE, NBPF_SEGMENTS_PER_PAGE, sizeof(*dpage)); + + for (i = 0, ldesc = dpage->ldesc, hwdesc = dpage->hwdesc; + i < ARRAY_SIZE(dpage->ldesc); + i++, ldesc++, hwdesc++) { + ldesc->hwdesc = hwdesc; + list_add_tail(&ldesc->node, &lhead); + ldesc->hwdesc_dma_addr = dma_map_single(dchan->device->dev, + hwdesc, sizeof(*hwdesc), DMA_TO_DEVICE); + + dev_dbg(dev, "%s(): mapped 0x%p to %pad\n", __func__, + hwdesc, &ldesc->hwdesc_dma_addr); + } + + for (i = 0, desc = dpage->desc; + i < ARRAY_SIZE(dpage->desc); + i++, desc++) { + dma_async_tx_descriptor_init(&desc->async_tx, dchan); + desc->async_tx.tx_submit = nbpf_tx_submit; + desc->chan = chan; + INIT_LIST_HEAD(&desc->sg); + list_add_tail(&desc->node, &head); + } + + /* + * This function cannot be called from interrupt context, so, no need to + * save flags + */ + spin_lock_irq(&chan->lock); + list_splice_tail(&lhead, &chan->free_links); + list_splice_tail(&head, &chan->free); + list_add(&dpage->node, &chan->desc_page); + spin_unlock_irq(&chan->lock); + + return ARRAY_SIZE(dpage->desc); +} + +static void nbpf_desc_put(struct nbpf_desc *desc) +{ + struct nbpf_channel *chan = desc->chan; + struct nbpf_link_desc *ldesc, *tmp; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + list_for_each_entry_safe(ldesc, tmp, &desc->sg, node) + list_move(&ldesc->node, &chan->free_links); + + list_add(&desc->node, &chan->free); + spin_unlock_irqrestore(&chan->lock, flags); +} + +static void nbpf_scan_acked(struct nbpf_channel *chan) +{ + struct nbpf_desc *desc, *tmp; + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&chan->lock, flags); + list_for_each_entry_safe(desc, tmp, &chan->done, node) + if (async_tx_test_ack(&desc->async_tx) && desc->user_wait) { + list_move(&desc->node, &head); + desc->user_wait = false; + } + spin_unlock_irqrestore(&chan->lock, flags); + + list_for_each_entry_safe(desc, tmp, &head, node) { + list_del(&desc->node); + nbpf_desc_put(desc); + } +} + +/* + * We have to allocate descriptors with the channel lock dropped. This means, + * before we re-acquire the lock buffers can be taken already, so we have to + * re-check after re-acquiring the lock and possibly retry, if buffers are gone + * again. + */ +static struct nbpf_desc *nbpf_desc_get(struct nbpf_channel *chan, size_t len) +{ + struct nbpf_desc *desc = NULL; + struct nbpf_link_desc *ldesc, *prev = NULL; + + nbpf_scan_acked(chan); + + spin_lock_irq(&chan->lock); + + do { + int i = 0, ret; + + if (list_empty(&chan->free)) { + /* No more free descriptors */ + spin_unlock_irq(&chan->lock); + ret = nbpf_desc_page_alloc(chan); + if (ret < 0) + return NULL; + spin_lock_irq(&chan->lock); + continue; + } + desc = list_first_entry(&chan->free, struct nbpf_desc, node); + list_del(&desc->node); + + do { + if (list_empty(&chan->free_links)) { + /* No more free link descriptors */ + spin_unlock_irq(&chan->lock); + ret = nbpf_desc_page_alloc(chan); + if (ret < 0) { + nbpf_desc_put(desc); + return NULL; + } + spin_lock_irq(&chan->lock); + continue; + } + + ldesc = list_first_entry(&chan->free_links, + struct nbpf_link_desc, node); + ldesc->desc = desc; + if (prev) + prev->hwdesc->next = (u32)ldesc->hwdesc_dma_addr; + + prev = ldesc; + list_move_tail(&ldesc->node, &desc->sg); + + i++; + } while (i < len); + } while (!desc); + + prev->hwdesc->next = 0; + + spin_unlock_irq(&chan->lock); + + return desc; +} + +static void nbpf_chan_idle(struct nbpf_channel *chan) +{ + struct nbpf_desc *desc, *tmp; + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&chan->lock, flags); + + list_splice_init(&chan->done, &head); + list_splice_init(&chan->active, &head); + list_splice_init(&chan->queued, &head); + + chan->running = NULL; + + spin_unlock_irqrestore(&chan->lock, flags); + + list_for_each_entry_safe(desc, tmp, &head, node) { + dev_dbg(chan->nbpf->dma_dev.dev, "%s(): force-free desc %p cookie %d\n", + __func__, desc, desc->async_tx.cookie); + list_del(&desc->node); + nbpf_desc_put(desc); + } +} + +static int nbpf_pause(struct dma_chan *dchan) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + + dev_dbg(dchan->device->dev, "Entry %s\n", __func__); + + chan->paused = true; + nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_SETSUS); + /* See comment in nbpf_prep_one() */ + nbpf_chan_write(chan, NBPF_CHAN_CTRL, NBPF_CHAN_CTRL_CLREN); + + return 0; +} + +static int nbpf_terminate_all(struct dma_chan *dchan) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + + dev_dbg(dchan->device->dev, "Entry %s\n", __func__); + dev_dbg(dchan->device->dev, "Terminating\n"); + + nbpf_chan_halt(chan); + nbpf_chan_idle(chan); + + return 0; +} + +static int nbpf_config(struct dma_chan *dchan, + struct dma_slave_config *config) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + + dev_dbg(dchan->device->dev, "Entry %s\n", __func__); + + /* + * We could check config->slave_id to match chan->terminal here, + * but with DT they would be coming from the same source, so + * such a check would be superflous + */ + + chan->slave_dst_addr = config->dst_addr; + chan->slave_dst_width = nbpf_xfer_size(chan->nbpf, + config->dst_addr_width, 1); + chan->slave_dst_burst = nbpf_xfer_size(chan->nbpf, + config->dst_addr_width, + config->dst_maxburst); + chan->slave_src_addr = config->src_addr; + chan->slave_src_width = nbpf_xfer_size(chan->nbpf, + config->src_addr_width, 1); + chan->slave_src_burst = nbpf_xfer_size(chan->nbpf, + config->src_addr_width, + config->src_maxburst); + + return 0; +} + +static struct dma_async_tx_descriptor *nbpf_prep_sg(struct nbpf_channel *chan, + struct scatterlist *src_sg, struct scatterlist *dst_sg, + size_t len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct nbpf_link_desc *ldesc; + struct scatterlist *mem_sg; + struct nbpf_desc *desc; + bool inc_src, inc_dst; + size_t data_len = 0; + int i = 0; + + switch (direction) { + case DMA_DEV_TO_MEM: + mem_sg = dst_sg; + inc_src = false; + inc_dst = true; + break; + + case DMA_MEM_TO_DEV: + mem_sg = src_sg; + inc_src = true; + inc_dst = false; + break; + + default: + case DMA_MEM_TO_MEM: + mem_sg = src_sg; + inc_src = true; + inc_dst = true; + } + + desc = nbpf_desc_get(chan, len); + if (!desc) + return NULL; + + desc->async_tx.flags = flags; + desc->async_tx.cookie = -EBUSY; + desc->user_wait = false; + + /* + * This is a private descriptor list, and we own the descriptor. No need + * to lock. + */ + list_for_each_entry(ldesc, &desc->sg, node) { + int ret = nbpf_prep_one(ldesc, direction, + sg_dma_address(src_sg), + sg_dma_address(dst_sg), + sg_dma_len(mem_sg), + i == len - 1); + if (ret < 0) { + nbpf_desc_put(desc); + return NULL; + } + data_len += sg_dma_len(mem_sg); + if (inc_src) + src_sg = sg_next(src_sg); + if (inc_dst) + dst_sg = sg_next(dst_sg); + mem_sg = direction == DMA_DEV_TO_MEM ? dst_sg : src_sg; + i++; + } + + desc->length = data_len; + + /* The user has to return the descriptor to us ASAP via .tx_submit() */ + return &desc->async_tx; +} + +static struct dma_async_tx_descriptor *nbpf_prep_memcpy( + struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + struct scatterlist dst_sg; + struct scatterlist src_sg; + + sg_init_table(&dst_sg, 1); + sg_init_table(&src_sg, 1); + + sg_dma_address(&dst_sg) = dst; + sg_dma_address(&src_sg) = src; + + sg_dma_len(&dst_sg) = len; + sg_dma_len(&src_sg) = len; + + dev_dbg(dchan->device->dev, "%s(): %zu @ %pad -> %pad\n", + __func__, len, &src, &dst); + + return nbpf_prep_sg(chan, &src_sg, &dst_sg, 1, + DMA_MEM_TO_MEM, flags); +} + +static struct dma_async_tx_descriptor *nbpf_prep_memcpy_sg( + struct dma_chan *dchan, + struct scatterlist *dst_sg, unsigned int dst_nents, + struct scatterlist *src_sg, unsigned int src_nents, + unsigned long flags) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + + if (dst_nents != src_nents) + return NULL; + + return nbpf_prep_sg(chan, src_sg, dst_sg, src_nents, + DMA_MEM_TO_MEM, flags); +} + +static struct dma_async_tx_descriptor *nbpf_prep_slave_sg( + struct dma_chan *dchan, struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, void *context) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + struct scatterlist slave_sg; + + dev_dbg(dchan->device->dev, "Entry %s()\n", __func__); + + sg_init_table(&slave_sg, 1); + + switch (direction) { + case DMA_MEM_TO_DEV: + sg_dma_address(&slave_sg) = chan->slave_dst_addr; + return nbpf_prep_sg(chan, sgl, &slave_sg, sg_len, + direction, flags); + + case DMA_DEV_TO_MEM: + sg_dma_address(&slave_sg) = chan->slave_src_addr; + return nbpf_prep_sg(chan, &slave_sg, sgl, sg_len, + direction, flags); + + default: + return NULL; + } +} + +static int nbpf_alloc_chan_resources(struct dma_chan *dchan) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + int ret; + + INIT_LIST_HEAD(&chan->free); + INIT_LIST_HEAD(&chan->free_links); + INIT_LIST_HEAD(&chan->queued); + INIT_LIST_HEAD(&chan->active); + INIT_LIST_HEAD(&chan->done); + + ret = nbpf_desc_page_alloc(chan); + if (ret < 0) + return ret; + + dev_dbg(dchan->device->dev, "Entry %s(): terminal %u\n", __func__, + chan->terminal); + + nbpf_chan_configure(chan); + + return ret; +} + +static void nbpf_free_chan_resources(struct dma_chan *dchan) +{ + struct nbpf_channel *chan = nbpf_to_chan(dchan); + struct nbpf_desc_page *dpage, *tmp; + + dev_dbg(dchan->device->dev, "Entry %s()\n", __func__); + + nbpf_chan_halt(chan); + nbpf_chan_idle(chan); + /* Clean up for if a channel is re-used for MEMCPY after slave DMA */ + nbpf_chan_prepare_default(chan); + + list_for_each_entry_safe(dpage, tmp, &chan->desc_page, node) { + struct nbpf_link_desc *ldesc; + int i; + list_del(&dpage->node); + for (i = 0, ldesc = dpage->ldesc; + i < ARRAY_SIZE(dpage->ldesc); + i++, ldesc++) + dma_unmap_single(dchan->device->dev, ldesc->hwdesc_dma_addr, + sizeof(*ldesc->hwdesc), DMA_TO_DEVICE); + free_page((unsigned long)dpage); + } +} + +static struct dma_chan *nbpf_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct nbpf_device *nbpf = ofdma->of_dma_data; + struct dma_chan *dchan; + struct nbpf_channel *chan; + + if (dma_spec->args_count != 2) + return NULL; + + dchan = dma_get_any_slave_channel(&nbpf->dma_dev); + if (!dchan) + return NULL; + + dev_dbg(dchan->device->dev, "Entry %s(%s)\n", __func__, + dma_spec->np->name); + + chan = nbpf_to_chan(dchan); + + chan->terminal = dma_spec->args[0]; + chan->flags = dma_spec->args[1]; + + nbpf_chan_prepare(chan); + nbpf_chan_configure(chan); + + return dchan; +} + +static void nbpf_chan_tasklet(unsigned long data) +{ + struct nbpf_channel *chan = (struct nbpf_channel *)data; + struct nbpf_desc *desc, *tmp; + dma_async_tx_callback callback; + void *param; + + while (!list_empty(&chan->done)) { + bool found = false, must_put, recycling = false; + + spin_lock_irq(&chan->lock); + + list_for_each_entry_safe(desc, tmp, &chan->done, node) { + if (!desc->user_wait) { + /* Newly completed descriptor, have to process */ + found = true; + break; + } else if (async_tx_test_ack(&desc->async_tx)) { + /* + * This descriptor was waiting for a user ACK, + * it can be recycled now. + */ + list_del(&desc->node); + spin_unlock_irq(&chan->lock); + nbpf_desc_put(desc); + recycling = true; + break; + } + } + + if (recycling) + continue; + + if (!found) { + /* This can happen if TERMINATE_ALL has been called */ + spin_unlock_irq(&chan->lock); + break; + } + + dma_cookie_complete(&desc->async_tx); + + /* + * With released lock we cannot dereference desc, maybe it's + * still on the "done" list + */ + if (async_tx_test_ack(&desc->async_tx)) { + list_del(&desc->node); + must_put = true; + } else { + desc->user_wait = true; + must_put = false; + } + + callback = desc->async_tx.callback; + param = desc->async_tx.callback_param; + + /* ack and callback completed descriptor */ + spin_unlock_irq(&chan->lock); + + if (callback) + callback(param); + + if (must_put) + nbpf_desc_put(desc); + } +} + +static irqreturn_t nbpf_chan_irq(int irq, void *dev) +{ + struct nbpf_channel *chan = dev; + bool done = nbpf_status_get(chan); + struct nbpf_desc *desc; + irqreturn_t ret; + bool bh = false; + + if (!done) + return IRQ_NONE; + + nbpf_status_ack(chan); + + dev_dbg(&chan->dma_chan.dev->device, "%s()\n", __func__); + + spin_lock(&chan->lock); + desc = chan->running; + if (WARN_ON(!desc)) { + ret = IRQ_NONE; + goto unlock; + } else { + ret = IRQ_HANDLED; + bh = true; + } + + list_move_tail(&desc->node, &chan->done); + chan->running = NULL; + + if (!list_empty(&chan->active)) { + desc = list_first_entry(&chan->active, + struct nbpf_desc, node); + if (!nbpf_start(desc)) + chan->running = desc; + } + +unlock: + spin_unlock(&chan->lock); + + if (bh) + tasklet_schedule(&chan->tasklet); + + return ret; +} + +static irqreturn_t nbpf_err_irq(int irq, void *dev) +{ + struct nbpf_device *nbpf = dev; + u32 error = nbpf_error_get(nbpf); + + dev_warn(nbpf->dma_dev.dev, "DMA error IRQ %u\n", irq); + + if (!error) + return IRQ_NONE; + + do { + struct nbpf_channel *chan = nbpf_error_get_channel(nbpf, error); + /* On error: abort all queued transfers, no callback */ + nbpf_error_clear(chan); + nbpf_chan_idle(chan); + error = nbpf_error_get(nbpf); + } while (error); + + return IRQ_HANDLED; +} + +static int nbpf_chan_probe(struct nbpf_device *nbpf, int n) +{ + struct dma_device *dma_dev = &nbpf->dma_dev; + struct nbpf_channel *chan = nbpf->chan + n; + int ret; + + chan->nbpf = nbpf; + chan->base = nbpf->base + NBPF_REG_CHAN_OFFSET + NBPF_REG_CHAN_SIZE * n; + INIT_LIST_HEAD(&chan->desc_page); + spin_lock_init(&chan->lock); + chan->dma_chan.device = dma_dev; + dma_cookie_init(&chan->dma_chan); + nbpf_chan_prepare_default(chan); + + dev_dbg(dma_dev->dev, "%s(): channel %d: -> %p\n", __func__, n, chan->base); + + snprintf(chan->name, sizeof(chan->name), "nbpf %d", n); + + tasklet_init(&chan->tasklet, nbpf_chan_tasklet, (unsigned long)chan); + ret = devm_request_irq(dma_dev->dev, chan->irq, + nbpf_chan_irq, IRQF_SHARED, + chan->name, chan); + if (ret < 0) + return ret; + + /* Add the channel to DMA device channel list */ + list_add_tail(&chan->dma_chan.device_node, + &dma_dev->channels); + + return 0; +} + +static const struct of_device_id nbpf_match[] = { + {.compatible = "renesas,nbpfaxi64dmac1b4", .data = &nbpf_cfg[NBPF1B4]}, + {.compatible = "renesas,nbpfaxi64dmac1b8", .data = &nbpf_cfg[NBPF1B8]}, + {.compatible = "renesas,nbpfaxi64dmac1b16", .data = &nbpf_cfg[NBPF1B16]}, + {.compatible = "renesas,nbpfaxi64dmac4b4", .data = &nbpf_cfg[NBPF4B4]}, + {.compatible = "renesas,nbpfaxi64dmac4b8", .data = &nbpf_cfg[NBPF4B8]}, + {.compatible = "renesas,nbpfaxi64dmac4b16", .data = &nbpf_cfg[NBPF4B16]}, + {.compatible = "renesas,nbpfaxi64dmac8b4", .data = &nbpf_cfg[NBPF8B4]}, + {.compatible = "renesas,nbpfaxi64dmac8b8", .data = &nbpf_cfg[NBPF8B8]}, + {.compatible = "renesas,nbpfaxi64dmac8b16", .data = &nbpf_cfg[NBPF8B16]}, + {} +}; +MODULE_DEVICE_TABLE(of, nbpf_match); + +static int nbpf_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + const struct of_device_id *of_id = of_match_device(nbpf_match, dev); + struct device_node *np = dev->of_node; + struct nbpf_device *nbpf; + struct dma_device *dma_dev; + struct resource *iomem, *irq_res; + const struct nbpf_config *cfg; + int num_channels; + int ret, irq, eirq, i; + int irqbuf[9] /* maximum 8 channels + error IRQ */; + unsigned int irqs = 0; + + BUILD_BUG_ON(sizeof(struct nbpf_desc_page) > PAGE_SIZE); + + /* DT only */ + if (!np || !of_id || !of_id->data) + return -ENODEV; + + cfg = of_id->data; + num_channels = cfg->num_channels; + + nbpf = devm_kzalloc(dev, sizeof(*nbpf) + num_channels * + sizeof(nbpf->chan[0]), GFP_KERNEL); + if (!nbpf) { + dev_err(dev, "Memory allocation failed\n"); + return -ENOMEM; + } + dma_dev = &nbpf->dma_dev; + dma_dev->dev = dev; + + iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + nbpf->base = devm_ioremap_resource(dev, iomem); + if (IS_ERR(nbpf->base)) + return PTR_ERR(nbpf->base); + + nbpf->clk = devm_clk_get(dev, NULL); + if (IS_ERR(nbpf->clk)) + return PTR_ERR(nbpf->clk); + + nbpf->config = cfg; + + for (i = 0; irqs < ARRAY_SIZE(irqbuf); i++) { + irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, i); + if (!irq_res) + break; + + for (irq = irq_res->start; irq <= irq_res->end; + irq++, irqs++) + irqbuf[irqs] = irq; + } + + /* + * 3 IRQ resource schemes are supported: + * 1. 1 shared IRQ for error and all channels + * 2. 2 IRQs: one for error and one shared for all channels + * 3. 1 IRQ for error and an own IRQ for each channel + */ + if (irqs != 1 && irqs != 2 && irqs != num_channels + 1) + return -ENXIO; + + if (irqs == 1) { + eirq = irqbuf[0]; + + for (i = 0; i <= num_channels; i++) + nbpf->chan[i].irq = irqbuf[0]; + } else { + eirq = platform_get_irq_byname(pdev, "error"); + if (eirq < 0) + return eirq; + + if (irqs == num_channels + 1) { + struct nbpf_channel *chan; + + for (i = 0, chan = nbpf->chan; i <= num_channels; + i++, chan++) { + /* Skip the error IRQ */ + if (irqbuf[i] == eirq) + i++; + chan->irq = irqbuf[i]; + } + + if (chan != nbpf->chan + num_channels) + return -EINVAL; + } else { + /* 2 IRQs and more than one channel */ + if (irqbuf[0] == eirq) + irq = irqbuf[1]; + else + irq = irqbuf[0]; + + for (i = 0; i <= num_channels; i++) + nbpf->chan[i].irq = irq; + } + } + + ret = devm_request_irq(dev, eirq, nbpf_err_irq, + IRQF_SHARED, "dma error", nbpf); + if (ret < 0) + return ret; + + INIT_LIST_HEAD(&dma_dev->channels); + + /* Create DMA Channel */ + for (i = 0; i < num_channels; i++) { + ret = nbpf_chan_probe(nbpf, i); + if (ret < 0) + return ret; + } + + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask); + dma_cap_set(DMA_SG, dma_dev->cap_mask); + + /* Common and MEMCPY operations */ + dma_dev->device_alloc_chan_resources + = nbpf_alloc_chan_resources; + dma_dev->device_free_chan_resources = nbpf_free_chan_resources; + dma_dev->device_prep_dma_sg = nbpf_prep_memcpy_sg; + dma_dev->device_prep_dma_memcpy = nbpf_prep_memcpy; + dma_dev->device_tx_status = nbpf_tx_status; + dma_dev->device_issue_pending = nbpf_issue_pending; + + /* + * If we drop support for unaligned MEMCPY buffer addresses and / or + * lengths by setting + * dma_dev->copy_align = 4; + * then we can set transfer length to 4 bytes in nbpf_prep_one() for + * DMA_MEM_TO_MEM + */ + + /* Compulsory for DMA_SLAVE fields */ + dma_dev->device_prep_slave_sg = nbpf_prep_slave_sg; + dma_dev->device_config = nbpf_config; + dma_dev->device_pause = nbpf_pause; + dma_dev->device_terminate_all = nbpf_terminate_all; + + dma_dev->src_addr_widths = NBPF_DMA_BUSWIDTHS; + dma_dev->dst_addr_widths = NBPF_DMA_BUSWIDTHS; + dma_dev->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + + platform_set_drvdata(pdev, nbpf); + + ret = clk_prepare_enable(nbpf->clk); + if (ret < 0) + return ret; + + nbpf_configure(nbpf); + + ret = dma_async_device_register(dma_dev); + if (ret < 0) + goto e_clk_off; + + ret = of_dma_controller_register(np, nbpf_of_xlate, nbpf); + if (ret < 0) + goto e_dma_dev_unreg; + + return 0; + +e_dma_dev_unreg: + dma_async_device_unregister(dma_dev); +e_clk_off: + clk_disable_unprepare(nbpf->clk); + + return ret; +} + +static int nbpf_remove(struct platform_device *pdev) +{ + struct nbpf_device *nbpf = platform_get_drvdata(pdev); + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&nbpf->dma_dev); + clk_disable_unprepare(nbpf->clk); + + return 0; +} + +static struct platform_device_id nbpf_ids[] = { + {"nbpfaxi64dmac1b4", (kernel_ulong_t)&nbpf_cfg[NBPF1B4]}, + {"nbpfaxi64dmac1b8", (kernel_ulong_t)&nbpf_cfg[NBPF1B8]}, + {"nbpfaxi64dmac1b16", (kernel_ulong_t)&nbpf_cfg[NBPF1B16]}, + {"nbpfaxi64dmac4b4", (kernel_ulong_t)&nbpf_cfg[NBPF4B4]}, + {"nbpfaxi64dmac4b8", (kernel_ulong_t)&nbpf_cfg[NBPF4B8]}, + {"nbpfaxi64dmac4b16", (kernel_ulong_t)&nbpf_cfg[NBPF4B16]}, + {"nbpfaxi64dmac8b4", (kernel_ulong_t)&nbpf_cfg[NBPF8B4]}, + {"nbpfaxi64dmac8b8", (kernel_ulong_t)&nbpf_cfg[NBPF8B8]}, + {"nbpfaxi64dmac8b16", (kernel_ulong_t)&nbpf_cfg[NBPF8B16]}, + {}, +}; +MODULE_DEVICE_TABLE(platform, nbpf_ids); + +#ifdef CONFIG_PM +static int nbpf_runtime_suspend(struct device *dev) +{ + struct nbpf_device *nbpf = platform_get_drvdata(to_platform_device(dev)); + clk_disable_unprepare(nbpf->clk); + return 0; +} + +static int nbpf_runtime_resume(struct device *dev) +{ + struct nbpf_device *nbpf = platform_get_drvdata(to_platform_device(dev)); + return clk_prepare_enable(nbpf->clk); +} +#endif + +static const struct dev_pm_ops nbpf_pm_ops = { + SET_RUNTIME_PM_OPS(nbpf_runtime_suspend, nbpf_runtime_resume, NULL) +}; + +static struct platform_driver nbpf_driver = { + .driver = { + .name = "dma-nbpf", + .of_match_table = nbpf_match, + .pm = &nbpf_pm_ops, + }, + .id_table = nbpf_ids, + .probe = nbpf_probe, + .remove = nbpf_remove, +}; + +module_platform_driver(nbpf_driver); + +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); +MODULE_DESCRIPTION("dmaengine driver for NBPFAXI64* DMACs"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c new file mode 100644 index 000000000..cbd4a8aff --- /dev/null +++ b/drivers/dma/of-dma.c @@ -0,0 +1,260 @@ +/* + * Device tree helpers for DMA request / controller + * + * Based on of_gpio.c + * + * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/device.h> +#include <linux/err.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/of.h> +#include <linux/of_dma.h> + +static LIST_HEAD(of_dma_list); +static DEFINE_MUTEX(of_dma_lock); + +/** + * of_dma_find_controller - Get a DMA controller in DT DMA helpers list + * @dma_spec: pointer to DMA specifier as found in the device tree + * + * Finds a DMA controller with matching device node and number for dma cells + * in a list of registered DMA controllers. If a match is found a valid pointer + * to the DMA data stored is retuned. A NULL pointer is returned if no match is + * found. + */ +static struct of_dma *of_dma_find_controller(struct of_phandle_args *dma_spec) +{ + struct of_dma *ofdma; + + list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers) + if (ofdma->of_node == dma_spec->np) + return ofdma; + + pr_debug("%s: can't find DMA controller %s\n", __func__, + dma_spec->np->full_name); + + return NULL; +} + +/** + * of_dma_controller_register - Register a DMA controller to DT DMA helpers + * @np: device node of DMA controller + * @of_dma_xlate: translation function which converts a phandle + * arguments list into a dma_chan structure + * @data pointer to controller specific data to be used by + * translation function + * + * Returns 0 on success or appropriate errno value on error. + * + * Allocated memory should be freed with appropriate of_dma_controller_free() + * call. + */ +int of_dma_controller_register(struct device_node *np, + struct dma_chan *(*of_dma_xlate) + (struct of_phandle_args *, struct of_dma *), + void *data) +{ + struct of_dma *ofdma; + + if (!np || !of_dma_xlate) { + pr_err("%s: not enough information provided\n", __func__); + return -EINVAL; + } + + ofdma = kzalloc(sizeof(*ofdma), GFP_KERNEL); + if (!ofdma) + return -ENOMEM; + + ofdma->of_node = np; + ofdma->of_dma_xlate = of_dma_xlate; + ofdma->of_dma_data = data; + + /* Now queue of_dma controller structure in list */ + mutex_lock(&of_dma_lock); + list_add_tail(&ofdma->of_dma_controllers, &of_dma_list); + mutex_unlock(&of_dma_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(of_dma_controller_register); + +/** + * of_dma_controller_free - Remove a DMA controller from DT DMA helpers list + * @np: device node of DMA controller + * + * Memory allocated by of_dma_controller_register() is freed here. + */ +void of_dma_controller_free(struct device_node *np) +{ + struct of_dma *ofdma; + + mutex_lock(&of_dma_lock); + + list_for_each_entry(ofdma, &of_dma_list, of_dma_controllers) + if (ofdma->of_node == np) { + list_del(&ofdma->of_dma_controllers); + kfree(ofdma); + break; + } + + mutex_unlock(&of_dma_lock); +} +EXPORT_SYMBOL_GPL(of_dma_controller_free); + +/** + * of_dma_match_channel - Check if a DMA specifier matches name + * @np: device node to look for DMA channels + * @name: channel name to be matched + * @index: index of DMA specifier in list of DMA specifiers + * @dma_spec: pointer to DMA specifier as found in the device tree + * + * Check if the DMA specifier pointed to by the index in a list of DMA + * specifiers, matches the name provided. Returns 0 if the name matches and + * a valid pointer to the DMA specifier is found. Otherwise returns -ENODEV. + */ +static int of_dma_match_channel(struct device_node *np, const char *name, + int index, struct of_phandle_args *dma_spec) +{ + const char *s; + + if (of_property_read_string_index(np, "dma-names", index, &s)) + return -ENODEV; + + if (strcmp(name, s)) + return -ENODEV; + + if (of_parse_phandle_with_args(np, "dmas", "#dma-cells", index, + dma_spec)) + return -ENODEV; + + return 0; +} + +/** + * of_dma_request_slave_channel - Get the DMA slave channel + * @np: device node to get DMA request from + * @name: name of desired channel + * + * Returns pointer to appropriate DMA channel on success or an error pointer. + */ +struct dma_chan *of_dma_request_slave_channel(struct device_node *np, + const char *name) +{ + struct of_phandle_args dma_spec; + struct of_dma *ofdma; + struct dma_chan *chan; + int count, i; + int ret_no_channel = -ENODEV; + + if (!np || !name) { + pr_err("%s: not enough information provided\n", __func__); + return ERR_PTR(-ENODEV); + } + + /* Silently fail if there is not even the "dmas" property */ + if (!of_find_property(np, "dmas", NULL)) + return ERR_PTR(-ENODEV); + + count = of_property_count_strings(np, "dma-names"); + if (count < 0) { + pr_err("%s: dma-names property of node '%s' missing or empty\n", + __func__, np->full_name); + return ERR_PTR(-ENODEV); + } + + for (i = 0; i < count; i++) { + if (of_dma_match_channel(np, name, i, &dma_spec)) + continue; + + mutex_lock(&of_dma_lock); + ofdma = of_dma_find_controller(&dma_spec); + + if (ofdma) { + chan = ofdma->of_dma_xlate(&dma_spec, ofdma); + } else { + ret_no_channel = -EPROBE_DEFER; + chan = NULL; + } + + mutex_unlock(&of_dma_lock); + + of_node_put(dma_spec.np); + + if (chan) + return chan; + } + + return ERR_PTR(ret_no_channel); +} +EXPORT_SYMBOL_GPL(of_dma_request_slave_channel); + +/** + * of_dma_simple_xlate - Simple DMA engine translation function + * @dma_spec: pointer to DMA specifier as found in the device tree + * @of_dma: pointer to DMA controller data + * + * A simple translation function for devices that use a 32-bit value for the + * filter_param when calling the DMA engine dma_request_channel() function. + * Note that this translation function requires that #dma-cells is equal to 1 + * and the argument of the dma specifier is the 32-bit filter_param. Returns + * pointer to appropriate dma channel on success or NULL on error. + */ +struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + int count = dma_spec->args_count; + struct of_dma_filter_info *info = ofdma->of_dma_data; + + if (!info || !info->filter_fn) + return NULL; + + if (count != 1) + return NULL; + + return dma_request_channel(info->dma_cap, info->filter_fn, + &dma_spec->args[0]); +} +EXPORT_SYMBOL_GPL(of_dma_simple_xlate); + +/** + * of_dma_xlate_by_chan_id - Translate dt property to DMA channel by channel id + * @dma_spec: pointer to DMA specifier as found in the device tree + * @of_dma: pointer to DMA controller data + * + * This function can be used as the of xlate callback for DMA driver which wants + * to match the channel based on the channel id. When using this xlate function + * the #dma-cells propety of the DMA controller dt node needs to be set to 1. + * The data parameter of of_dma_controller_register must be a pointer to the + * dma_device struct the function should match upon. + * + * Returns pointer to appropriate dma channel on success or NULL on error. + */ +struct dma_chan *of_dma_xlate_by_chan_id(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct dma_device *dev = ofdma->of_dma_data; + struct dma_chan *chan, *candidate = NULL; + + if (!dev || dma_spec->args_count != 1) + return NULL; + + list_for_each_entry(chan, &dev->channels, device_node) + if (chan->chan_id == dma_spec->args[0]) { + candidate = chan; + break; + } + + if (!candidate) + return NULL; + + return dma_get_slave_channel(candidate); +} +EXPORT_SYMBOL_GPL(of_dma_xlate_by_chan_id); diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c new file mode 100644 index 000000000..167dbaf65 --- /dev/null +++ b/drivers/dma/omap-dma.c @@ -0,0 +1,1233 @@ +/* + * OMAP DMAengine support + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/omap-dma.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/of_dma.h> +#include <linux/of_device.h> + +#include "virt-dma.h" + +struct omap_dmadev { + struct dma_device ddev; + spinlock_t lock; + struct tasklet_struct task; + struct list_head pending; + void __iomem *base; + const struct omap_dma_reg *reg_map; + struct omap_system_dma_plat_info *plat; + bool legacy; + spinlock_t irq_lock; + uint32_t irq_enable_mask; + struct omap_chan *lch_map[32]; +}; + +struct omap_chan { + struct virt_dma_chan vc; + struct list_head node; + void __iomem *channel_base; + const struct omap_dma_reg *reg_map; + uint32_t ccr; + + struct dma_slave_config cfg; + unsigned dma_sig; + bool cyclic; + bool paused; + + int dma_ch; + struct omap_desc *desc; + unsigned sgidx; +}; + +struct omap_sg { + dma_addr_t addr; + uint32_t en; /* number of elements (24-bit) */ + uint32_t fn; /* number of frames (16-bit) */ +}; + +struct omap_desc { + struct virt_dma_desc vd; + enum dma_transfer_direction dir; + dma_addr_t dev_addr; + + int16_t fi; /* for OMAP_DMA_SYNC_PACKET */ + uint8_t es; /* CSDP_DATA_TYPE_xxx */ + uint32_t ccr; /* CCR value */ + uint16_t clnk_ctrl; /* CLNK_CTRL value */ + uint16_t cicr; /* CICR value */ + uint32_t csdp; /* CSDP value */ + + unsigned sglen; + struct omap_sg sg[0]; +}; + +enum { + CCR_FS = BIT(5), + CCR_READ_PRIORITY = BIT(6), + CCR_ENABLE = BIT(7), + CCR_AUTO_INIT = BIT(8), /* OMAP1 only */ + CCR_REPEAT = BIT(9), /* OMAP1 only */ + CCR_OMAP31_DISABLE = BIT(10), /* OMAP1 only */ + CCR_SUSPEND_SENSITIVE = BIT(8), /* OMAP2+ only */ + CCR_RD_ACTIVE = BIT(9), /* OMAP2+ only */ + CCR_WR_ACTIVE = BIT(10), /* OMAP2+ only */ + CCR_SRC_AMODE_CONSTANT = 0 << 12, + CCR_SRC_AMODE_POSTINC = 1 << 12, + CCR_SRC_AMODE_SGLIDX = 2 << 12, + CCR_SRC_AMODE_DBLIDX = 3 << 12, + CCR_DST_AMODE_CONSTANT = 0 << 14, + CCR_DST_AMODE_POSTINC = 1 << 14, + CCR_DST_AMODE_SGLIDX = 2 << 14, + CCR_DST_AMODE_DBLIDX = 3 << 14, + CCR_CONSTANT_FILL = BIT(16), + CCR_TRANSPARENT_COPY = BIT(17), + CCR_BS = BIT(18), + CCR_SUPERVISOR = BIT(22), + CCR_PREFETCH = BIT(23), + CCR_TRIGGER_SRC = BIT(24), + CCR_BUFFERING_DISABLE = BIT(25), + CCR_WRITE_PRIORITY = BIT(26), + CCR_SYNC_ELEMENT = 0, + CCR_SYNC_FRAME = CCR_FS, + CCR_SYNC_BLOCK = CCR_BS, + CCR_SYNC_PACKET = CCR_BS | CCR_FS, + + CSDP_DATA_TYPE_8 = 0, + CSDP_DATA_TYPE_16 = 1, + CSDP_DATA_TYPE_32 = 2, + CSDP_SRC_PORT_EMIFF = 0 << 2, /* OMAP1 only */ + CSDP_SRC_PORT_EMIFS = 1 << 2, /* OMAP1 only */ + CSDP_SRC_PORT_OCP_T1 = 2 << 2, /* OMAP1 only */ + CSDP_SRC_PORT_TIPB = 3 << 2, /* OMAP1 only */ + CSDP_SRC_PORT_OCP_T2 = 4 << 2, /* OMAP1 only */ + CSDP_SRC_PORT_MPUI = 5 << 2, /* OMAP1 only */ + CSDP_SRC_PACKED = BIT(6), + CSDP_SRC_BURST_1 = 0 << 7, + CSDP_SRC_BURST_16 = 1 << 7, + CSDP_SRC_BURST_32 = 2 << 7, + CSDP_SRC_BURST_64 = 3 << 7, + CSDP_DST_PORT_EMIFF = 0 << 9, /* OMAP1 only */ + CSDP_DST_PORT_EMIFS = 1 << 9, /* OMAP1 only */ + CSDP_DST_PORT_OCP_T1 = 2 << 9, /* OMAP1 only */ + CSDP_DST_PORT_TIPB = 3 << 9, /* OMAP1 only */ + CSDP_DST_PORT_OCP_T2 = 4 << 9, /* OMAP1 only */ + CSDP_DST_PORT_MPUI = 5 << 9, /* OMAP1 only */ + CSDP_DST_PACKED = BIT(13), + CSDP_DST_BURST_1 = 0 << 14, + CSDP_DST_BURST_16 = 1 << 14, + CSDP_DST_BURST_32 = 2 << 14, + CSDP_DST_BURST_64 = 3 << 14, + + CICR_TOUT_IE = BIT(0), /* OMAP1 only */ + CICR_DROP_IE = BIT(1), + CICR_HALF_IE = BIT(2), + CICR_FRAME_IE = BIT(3), + CICR_LAST_IE = BIT(4), + CICR_BLOCK_IE = BIT(5), + CICR_PKT_IE = BIT(7), /* OMAP2+ only */ + CICR_TRANS_ERR_IE = BIT(8), /* OMAP2+ only */ + CICR_SUPERVISOR_ERR_IE = BIT(10), /* OMAP2+ only */ + CICR_MISALIGNED_ERR_IE = BIT(11), /* OMAP2+ only */ + CICR_DRAIN_IE = BIT(12), /* OMAP2+ only */ + CICR_SUPER_BLOCK_IE = BIT(14), /* OMAP2+ only */ + + CLNK_CTRL_ENABLE_LNK = BIT(15), +}; + +static const unsigned es_bytes[] = { + [CSDP_DATA_TYPE_8] = 1, + [CSDP_DATA_TYPE_16] = 2, + [CSDP_DATA_TYPE_32] = 4, +}; + +static struct of_dma_filter_info omap_dma_info = { + .filter_fn = omap_dma_filter_fn, +}; + +static inline struct omap_dmadev *to_omap_dma_dev(struct dma_device *d) +{ + return container_of(d, struct omap_dmadev, ddev); +} + +static inline struct omap_chan *to_omap_dma_chan(struct dma_chan *c) +{ + return container_of(c, struct omap_chan, vc.chan); +} + +static inline struct omap_desc *to_omap_dma_desc(struct dma_async_tx_descriptor *t) +{ + return container_of(t, struct omap_desc, vd.tx); +} + +static void omap_dma_desc_free(struct virt_dma_desc *vd) +{ + kfree(container_of(vd, struct omap_desc, vd)); +} + +static void omap_dma_write(uint32_t val, unsigned type, void __iomem *addr) +{ + switch (type) { + case OMAP_DMA_REG_16BIT: + writew_relaxed(val, addr); + break; + case OMAP_DMA_REG_2X16BIT: + writew_relaxed(val, addr); + writew_relaxed(val >> 16, addr + 2); + break; + case OMAP_DMA_REG_32BIT: + writel_relaxed(val, addr); + break; + default: + WARN_ON(1); + } +} + +static unsigned omap_dma_read(unsigned type, void __iomem *addr) +{ + unsigned val; + + switch (type) { + case OMAP_DMA_REG_16BIT: + val = readw_relaxed(addr); + break; + case OMAP_DMA_REG_2X16BIT: + val = readw_relaxed(addr); + val |= readw_relaxed(addr + 2) << 16; + break; + case OMAP_DMA_REG_32BIT: + val = readl_relaxed(addr); + break; + default: + WARN_ON(1); + val = 0; + } + + return val; +} + +static void omap_dma_glbl_write(struct omap_dmadev *od, unsigned reg, unsigned val) +{ + const struct omap_dma_reg *r = od->reg_map + reg; + + WARN_ON(r->stride); + + omap_dma_write(val, r->type, od->base + r->offset); +} + +static unsigned omap_dma_glbl_read(struct omap_dmadev *od, unsigned reg) +{ + const struct omap_dma_reg *r = od->reg_map + reg; + + WARN_ON(r->stride); + + return omap_dma_read(r->type, od->base + r->offset); +} + +static void omap_dma_chan_write(struct omap_chan *c, unsigned reg, unsigned val) +{ + const struct omap_dma_reg *r = c->reg_map + reg; + + omap_dma_write(val, r->type, c->channel_base + r->offset); +} + +static unsigned omap_dma_chan_read(struct omap_chan *c, unsigned reg) +{ + const struct omap_dma_reg *r = c->reg_map + reg; + + return omap_dma_read(r->type, c->channel_base + r->offset); +} + +static void omap_dma_clear_csr(struct omap_chan *c) +{ + if (dma_omap1()) + omap_dma_chan_read(c, CSR); + else + omap_dma_chan_write(c, CSR, ~0); +} + +static unsigned omap_dma_get_csr(struct omap_chan *c) +{ + unsigned val = omap_dma_chan_read(c, CSR); + + if (!dma_omap1()) + omap_dma_chan_write(c, CSR, val); + + return val; +} + +static void omap_dma_assign(struct omap_dmadev *od, struct omap_chan *c, + unsigned lch) +{ + c->channel_base = od->base + od->plat->channel_stride * lch; + + od->lch_map[lch] = c; +} + +static void omap_dma_start(struct omap_chan *c, struct omap_desc *d) +{ + struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device); + + if (__dma_omap15xx(od->plat->dma_attr)) + omap_dma_chan_write(c, CPC, 0); + else + omap_dma_chan_write(c, CDAC, 0); + + omap_dma_clear_csr(c); + + /* Enable interrupts */ + omap_dma_chan_write(c, CICR, d->cicr); + + /* Enable channel */ + omap_dma_chan_write(c, CCR, d->ccr | CCR_ENABLE); +} + +static void omap_dma_stop(struct omap_chan *c) +{ + struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device); + uint32_t val; + + /* disable irq */ + omap_dma_chan_write(c, CICR, 0); + + omap_dma_clear_csr(c); + + val = omap_dma_chan_read(c, CCR); + if (od->plat->errata & DMA_ERRATA_i541 && val & CCR_TRIGGER_SRC) { + uint32_t sysconfig; + unsigned i; + + sysconfig = omap_dma_glbl_read(od, OCP_SYSCONFIG); + val = sysconfig & ~DMA_SYSCONFIG_MIDLEMODE_MASK; + val |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE); + omap_dma_glbl_write(od, OCP_SYSCONFIG, val); + + val = omap_dma_chan_read(c, CCR); + val &= ~CCR_ENABLE; + omap_dma_chan_write(c, CCR, val); + + /* Wait for sDMA FIFO to drain */ + for (i = 0; ; i++) { + val = omap_dma_chan_read(c, CCR); + if (!(val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE))) + break; + + if (i > 100) + break; + + udelay(5); + } + + if (val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE)) + dev_err(c->vc.chan.device->dev, + "DMA drain did not complete on lch %d\n", + c->dma_ch); + + omap_dma_glbl_write(od, OCP_SYSCONFIG, sysconfig); + } else { + val &= ~CCR_ENABLE; + omap_dma_chan_write(c, CCR, val); + } + + mb(); + + if (!__dma_omap15xx(od->plat->dma_attr) && c->cyclic) { + val = omap_dma_chan_read(c, CLNK_CTRL); + + if (dma_omap1()) + val |= 1 << 14; /* set the STOP_LNK bit */ + else + val &= ~CLNK_CTRL_ENABLE_LNK; + + omap_dma_chan_write(c, CLNK_CTRL, val); + } +} + +static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d, + unsigned idx) +{ + struct omap_sg *sg = d->sg + idx; + unsigned cxsa, cxei, cxfi; + + if (d->dir == DMA_DEV_TO_MEM) { + cxsa = CDSA; + cxei = CDEI; + cxfi = CDFI; + } else { + cxsa = CSSA; + cxei = CSEI; + cxfi = CSFI; + } + + omap_dma_chan_write(c, cxsa, sg->addr); + omap_dma_chan_write(c, cxei, 0); + omap_dma_chan_write(c, cxfi, 0); + omap_dma_chan_write(c, CEN, sg->en); + omap_dma_chan_write(c, CFN, sg->fn); + + omap_dma_start(c, d); +} + +static void omap_dma_start_desc(struct omap_chan *c) +{ + struct virt_dma_desc *vd = vchan_next_desc(&c->vc); + struct omap_desc *d; + unsigned cxsa, cxei, cxfi; + + if (!vd) { + c->desc = NULL; + return; + } + + list_del(&vd->node); + + c->desc = d = to_omap_dma_desc(&vd->tx); + c->sgidx = 0; + + /* + * This provides the necessary barrier to ensure data held in + * DMA coherent memory is visible to the DMA engine prior to + * the transfer starting. + */ + mb(); + + omap_dma_chan_write(c, CCR, d->ccr); + if (dma_omap1()) + omap_dma_chan_write(c, CCR2, d->ccr >> 16); + + if (d->dir == DMA_DEV_TO_MEM) { + cxsa = CSSA; + cxei = CSEI; + cxfi = CSFI; + } else { + cxsa = CDSA; + cxei = CDEI; + cxfi = CDFI; + } + + omap_dma_chan_write(c, cxsa, d->dev_addr); + omap_dma_chan_write(c, cxei, 0); + omap_dma_chan_write(c, cxfi, d->fi); + omap_dma_chan_write(c, CSDP, d->csdp); + omap_dma_chan_write(c, CLNK_CTRL, d->clnk_ctrl); + + omap_dma_start_sg(c, d, 0); +} + +static void omap_dma_callback(int ch, u16 status, void *data) +{ + struct omap_chan *c = data; + struct omap_desc *d; + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + d = c->desc; + if (d) { + if (!c->cyclic) { + if (++c->sgidx < d->sglen) { + omap_dma_start_sg(c, d, c->sgidx); + } else { + omap_dma_start_desc(c); + vchan_cookie_complete(&d->vd); + } + } else { + vchan_cyclic_callback(&d->vd); + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); +} + +/* + * This callback schedules all pending channels. We could be more + * clever here by postponing allocation of the real DMA channels to + * this point, and freeing them when our virtual channel becomes idle. + * + * We would then need to deal with 'all channels in-use' + */ +static void omap_dma_sched(unsigned long data) +{ + struct omap_dmadev *d = (struct omap_dmadev *)data; + LIST_HEAD(head); + + spin_lock_irq(&d->lock); + list_splice_tail_init(&d->pending, &head); + spin_unlock_irq(&d->lock); + + while (!list_empty(&head)) { + struct omap_chan *c = list_first_entry(&head, + struct omap_chan, node); + + spin_lock_irq(&c->vc.lock); + list_del_init(&c->node); + omap_dma_start_desc(c); + spin_unlock_irq(&c->vc.lock); + } +} + +static irqreturn_t omap_dma_irq(int irq, void *devid) +{ + struct omap_dmadev *od = devid; + unsigned status, channel; + + spin_lock(&od->irq_lock); + + status = omap_dma_glbl_read(od, IRQSTATUS_L1); + status &= od->irq_enable_mask; + if (status == 0) { + spin_unlock(&od->irq_lock); + return IRQ_NONE; + } + + while ((channel = ffs(status)) != 0) { + unsigned mask, csr; + struct omap_chan *c; + + channel -= 1; + mask = BIT(channel); + status &= ~mask; + + c = od->lch_map[channel]; + if (c == NULL) { + /* This should never happen */ + dev_err(od->ddev.dev, "invalid channel %u\n", channel); + continue; + } + + csr = omap_dma_get_csr(c); + omap_dma_glbl_write(od, IRQSTATUS_L1, mask); + + omap_dma_callback(channel, csr, c); + } + + spin_unlock(&od->irq_lock); + + return IRQ_HANDLED; +} + +static int omap_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct omap_dmadev *od = to_omap_dma_dev(chan->device); + struct omap_chan *c = to_omap_dma_chan(chan); + int ret; + + if (od->legacy) { + ret = omap_request_dma(c->dma_sig, "DMA engine", + omap_dma_callback, c, &c->dma_ch); + } else { + ret = omap_request_dma(c->dma_sig, "DMA engine", NULL, NULL, + &c->dma_ch); + } + + dev_dbg(od->ddev.dev, "allocating channel %u for %u\n", + c->dma_ch, c->dma_sig); + + if (ret >= 0) { + omap_dma_assign(od, c, c->dma_ch); + + if (!od->legacy) { + unsigned val; + + spin_lock_irq(&od->irq_lock); + val = BIT(c->dma_ch); + omap_dma_glbl_write(od, IRQSTATUS_L1, val); + od->irq_enable_mask |= val; + omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask); + + val = omap_dma_glbl_read(od, IRQENABLE_L0); + val &= ~BIT(c->dma_ch); + omap_dma_glbl_write(od, IRQENABLE_L0, val); + spin_unlock_irq(&od->irq_lock); + } + } + + if (dma_omap1()) { + if (__dma_omap16xx(od->plat->dma_attr)) { + c->ccr = CCR_OMAP31_DISABLE; + /* Duplicate what plat-omap/dma.c does */ + c->ccr |= c->dma_ch + 1; + } else { + c->ccr = c->dma_sig & 0x1f; + } + } else { + c->ccr = c->dma_sig & 0x1f; + c->ccr |= (c->dma_sig & ~0x1f) << 14; + } + if (od->plat->errata & DMA_ERRATA_IFRAME_BUFFERING) + c->ccr |= CCR_BUFFERING_DISABLE; + + return ret; +} + +static void omap_dma_free_chan_resources(struct dma_chan *chan) +{ + struct omap_dmadev *od = to_omap_dma_dev(chan->device); + struct omap_chan *c = to_omap_dma_chan(chan); + + if (!od->legacy) { + spin_lock_irq(&od->irq_lock); + od->irq_enable_mask &= ~BIT(c->dma_ch); + omap_dma_glbl_write(od, IRQENABLE_L1, od->irq_enable_mask); + spin_unlock_irq(&od->irq_lock); + } + + c->channel_base = NULL; + od->lch_map[c->dma_ch] = NULL; + vchan_free_chan_resources(&c->vc); + omap_free_dma(c->dma_ch); + + dev_dbg(od->ddev.dev, "freeing channel for %u\n", c->dma_sig); +} + +static size_t omap_dma_sg_size(struct omap_sg *sg) +{ + return sg->en * sg->fn; +} + +static size_t omap_dma_desc_size(struct omap_desc *d) +{ + unsigned i; + size_t size; + + for (size = i = 0; i < d->sglen; i++) + size += omap_dma_sg_size(&d->sg[i]); + + return size * es_bytes[d->es]; +} + +static size_t omap_dma_desc_size_pos(struct omap_desc *d, dma_addr_t addr) +{ + unsigned i; + size_t size, es_size = es_bytes[d->es]; + + for (size = i = 0; i < d->sglen; i++) { + size_t this_size = omap_dma_sg_size(&d->sg[i]) * es_size; + + if (size) + size += this_size; + else if (addr >= d->sg[i].addr && + addr < d->sg[i].addr + this_size) + size += d->sg[i].addr + this_size - addr; + } + return size; +} + +/* + * OMAP 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is + * read before the DMA controller finished disabling the channel. + */ +static uint32_t omap_dma_chan_read_3_3(struct omap_chan *c, unsigned reg) +{ + struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device); + uint32_t val; + + val = omap_dma_chan_read(c, reg); + if (val == 0 && od->plat->errata & DMA_ERRATA_3_3) + val = omap_dma_chan_read(c, reg); + + return val; +} + +static dma_addr_t omap_dma_get_src_pos(struct omap_chan *c) +{ + struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device); + dma_addr_t addr, cdac; + + if (__dma_omap15xx(od->plat->dma_attr)) { + addr = omap_dma_chan_read(c, CPC); + } else { + addr = omap_dma_chan_read_3_3(c, CSAC); + cdac = omap_dma_chan_read_3_3(c, CDAC); + + /* + * CDAC == 0 indicates that the DMA transfer on the channel has + * not been started (no data has been transferred so far). + * Return the programmed source start address in this case. + */ + if (cdac == 0) + addr = omap_dma_chan_read(c, CSSA); + } + + if (dma_omap1()) + addr |= omap_dma_chan_read(c, CSSA) & 0xffff0000; + + return addr; +} + +static dma_addr_t omap_dma_get_dst_pos(struct omap_chan *c) +{ + struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device); + dma_addr_t addr; + + if (__dma_omap15xx(od->plat->dma_attr)) { + addr = omap_dma_chan_read(c, CPC); + } else { + addr = omap_dma_chan_read_3_3(c, CDAC); + + /* + * CDAC == 0 indicates that the DMA transfer on the channel + * has not been started (no data has been transferred so + * far). Return the programmed destination start address in + * this case. + */ + if (addr == 0) + addr = omap_dma_chan_read(c, CDSA); + } + + if (dma_omap1()) + addr |= omap_dma_chan_read(c, CDSA) & 0xffff0000; + + return addr; +} + +static enum dma_status omap_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct omap_chan *c = to_omap_dma_chan(chan); + struct virt_dma_desc *vd; + enum dma_status ret; + unsigned long flags; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE || !txstate) + return ret; + + spin_lock_irqsave(&c->vc.lock, flags); + vd = vchan_find_desc(&c->vc, cookie); + if (vd) { + txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx)); + } else if (c->desc && c->desc->vd.tx.cookie == cookie) { + struct omap_desc *d = c->desc; + dma_addr_t pos; + + if (d->dir == DMA_MEM_TO_DEV) + pos = omap_dma_get_src_pos(c); + else if (d->dir == DMA_DEV_TO_MEM) + pos = omap_dma_get_dst_pos(c); + else + pos = 0; + + txstate->residue = omap_dma_desc_size_pos(d, pos); + } else { + txstate->residue = 0; + } + spin_unlock_irqrestore(&c->vc.lock, flags); + + return ret; +} + +static void omap_dma_issue_pending(struct dma_chan *chan) +{ + struct omap_chan *c = to_omap_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + if (vchan_issue_pending(&c->vc) && !c->desc) { + /* + * c->cyclic is used only by audio and in this case the DMA need + * to be started without delay. + */ + if (!c->cyclic) { + struct omap_dmadev *d = to_omap_dma_dev(chan->device); + spin_lock(&d->lock); + if (list_empty(&c->node)) + list_add_tail(&c->node, &d->pending); + spin_unlock(&d->lock); + tasklet_schedule(&d->task); + } else { + omap_dma_start_desc(c); + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); +} + +static struct dma_async_tx_descriptor *omap_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, unsigned sglen, + enum dma_transfer_direction dir, unsigned long tx_flags, void *context) +{ + struct omap_dmadev *od = to_omap_dma_dev(chan->device); + struct omap_chan *c = to_omap_dma_chan(chan); + enum dma_slave_buswidth dev_width; + struct scatterlist *sgent; + struct omap_desc *d; + dma_addr_t dev_addr; + unsigned i, j = 0, es, en, frame_bytes; + u32 burst; + + if (dir == DMA_DEV_TO_MEM) { + dev_addr = c->cfg.src_addr; + dev_width = c->cfg.src_addr_width; + burst = c->cfg.src_maxburst; + } else if (dir == DMA_MEM_TO_DEV) { + dev_addr = c->cfg.dst_addr; + dev_width = c->cfg.dst_addr_width; + burst = c->cfg.dst_maxburst; + } else { + dev_err(chan->device->dev, "%s: bad direction?\n", __func__); + return NULL; + } + + /* Bus width translates to the element size (ES) */ + switch (dev_width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + es = CSDP_DATA_TYPE_8; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + es = CSDP_DATA_TYPE_16; + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + es = CSDP_DATA_TYPE_32; + break; + default: /* not reached */ + return NULL; + } + + /* Now allocate and setup the descriptor. */ + d = kzalloc(sizeof(*d) + sglen * sizeof(d->sg[0]), GFP_ATOMIC); + if (!d) + return NULL; + + d->dir = dir; + d->dev_addr = dev_addr; + d->es = es; + + d->ccr = c->ccr | CCR_SYNC_FRAME; + if (dir == DMA_DEV_TO_MEM) + d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT; + else + d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC; + + d->cicr = CICR_DROP_IE | CICR_BLOCK_IE; + d->csdp = es; + + if (dma_omap1()) { + d->cicr |= CICR_TOUT_IE; + + if (dir == DMA_DEV_TO_MEM) + d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_TIPB; + else + d->csdp |= CSDP_DST_PORT_TIPB | CSDP_SRC_PORT_EMIFF; + } else { + if (dir == DMA_DEV_TO_MEM) + d->ccr |= CCR_TRIGGER_SRC; + + d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE; + } + if (od->plat->errata & DMA_ERRATA_PARALLEL_CHANNELS) + d->clnk_ctrl = c->dma_ch; + + /* + * Build our scatterlist entries: each contains the address, + * the number of elements (EN) in each frame, and the number of + * frames (FN). Number of bytes for this entry = ES * EN * FN. + * + * Burst size translates to number of elements with frame sync. + * Note: DMA engine defines burst to be the number of dev-width + * transfers. + */ + en = burst; + frame_bytes = es_bytes[es] * en; + for_each_sg(sgl, sgent, sglen, i) { + d->sg[j].addr = sg_dma_address(sgent); + d->sg[j].en = en; + d->sg[j].fn = sg_dma_len(sgent) / frame_bytes; + j++; + } + + d->sglen = j; + + return vchan_tx_prep(&c->vc, &d->vd, tx_flags); +} + +static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction dir, unsigned long flags) +{ + struct omap_dmadev *od = to_omap_dma_dev(chan->device); + struct omap_chan *c = to_omap_dma_chan(chan); + enum dma_slave_buswidth dev_width; + struct omap_desc *d; + dma_addr_t dev_addr; + unsigned es; + u32 burst; + + if (dir == DMA_DEV_TO_MEM) { + dev_addr = c->cfg.src_addr; + dev_width = c->cfg.src_addr_width; + burst = c->cfg.src_maxburst; + } else if (dir == DMA_MEM_TO_DEV) { + dev_addr = c->cfg.dst_addr; + dev_width = c->cfg.dst_addr_width; + burst = c->cfg.dst_maxburst; + } else { + dev_err(chan->device->dev, "%s: bad direction?\n", __func__); + return NULL; + } + + /* Bus width translates to the element size (ES) */ + switch (dev_width) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + es = CSDP_DATA_TYPE_8; + break; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + es = CSDP_DATA_TYPE_16; + break; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + es = CSDP_DATA_TYPE_32; + break; + default: /* not reached */ + return NULL; + } + + /* Now allocate and setup the descriptor. */ + d = kzalloc(sizeof(*d) + sizeof(d->sg[0]), GFP_ATOMIC); + if (!d) + return NULL; + + d->dir = dir; + d->dev_addr = dev_addr; + d->fi = burst; + d->es = es; + d->sg[0].addr = buf_addr; + d->sg[0].en = period_len / es_bytes[es]; + d->sg[0].fn = buf_len / period_len; + d->sglen = 1; + + d->ccr = c->ccr; + if (dir == DMA_DEV_TO_MEM) + d->ccr |= CCR_DST_AMODE_POSTINC | CCR_SRC_AMODE_CONSTANT; + else + d->ccr |= CCR_DST_AMODE_CONSTANT | CCR_SRC_AMODE_POSTINC; + + d->cicr = CICR_DROP_IE; + if (flags & DMA_PREP_INTERRUPT) + d->cicr |= CICR_FRAME_IE; + + d->csdp = es; + + if (dma_omap1()) { + d->cicr |= CICR_TOUT_IE; + + if (dir == DMA_DEV_TO_MEM) + d->csdp |= CSDP_DST_PORT_EMIFF | CSDP_SRC_PORT_MPUI; + else + d->csdp |= CSDP_DST_PORT_MPUI | CSDP_SRC_PORT_EMIFF; + } else { + if (burst) + d->ccr |= CCR_SYNC_PACKET; + else + d->ccr |= CCR_SYNC_ELEMENT; + + if (dir == DMA_DEV_TO_MEM) + d->ccr |= CCR_TRIGGER_SRC; + + d->cicr |= CICR_MISALIGNED_ERR_IE | CICR_TRANS_ERR_IE; + + d->csdp |= CSDP_DST_BURST_64 | CSDP_SRC_BURST_64; + } + + if (__dma_omap15xx(od->plat->dma_attr)) + d->ccr |= CCR_AUTO_INIT | CCR_REPEAT; + else + d->clnk_ctrl = c->dma_ch | CLNK_CTRL_ENABLE_LNK; + + c->cyclic = true; + + return vchan_tx_prep(&c->vc, &d->vd, flags); +} + +static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg) +{ + struct omap_chan *c = to_omap_dma_chan(chan); + + if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || + cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) + return -EINVAL; + + memcpy(&c->cfg, cfg, sizeof(c->cfg)); + + return 0; +} + +static int omap_dma_terminate_all(struct dma_chan *chan) +{ + struct omap_chan *c = to_omap_dma_chan(chan); + struct omap_dmadev *d = to_omap_dma_dev(c->vc.chan.device); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&c->vc.lock, flags); + + /* Prevent this channel being scheduled */ + spin_lock(&d->lock); + list_del_init(&c->node); + spin_unlock(&d->lock); + + /* + * Stop DMA activity: we assume the callback will not be called + * after omap_dma_stop() returns (even if it does, it will see + * c->desc is NULL and exit.) + */ + if (c->desc) { + omap_dma_desc_free(&c->desc->vd); + c->desc = NULL; + /* Avoid stopping the dma twice */ + if (!c->paused) + omap_dma_stop(c); + } + + if (c->cyclic) { + c->cyclic = false; + c->paused = false; + } + + vchan_get_all_descriptors(&c->vc, &head); + spin_unlock_irqrestore(&c->vc.lock, flags); + vchan_dma_desc_free_list(&c->vc, &head); + + return 0; +} + +static int omap_dma_pause(struct dma_chan *chan) +{ + struct omap_chan *c = to_omap_dma_chan(chan); + + /* Pause/Resume only allowed with cyclic mode */ + if (!c->cyclic) + return -EINVAL; + + if (!c->paused) { + omap_dma_stop(c); + c->paused = true; + } + + return 0; +} + +static int omap_dma_resume(struct dma_chan *chan) +{ + struct omap_chan *c = to_omap_dma_chan(chan); + + /* Pause/Resume only allowed with cyclic mode */ + if (!c->cyclic) + return -EINVAL; + + if (c->paused) { + mb(); + + /* Restore channel link register */ + omap_dma_chan_write(c, CLNK_CTRL, c->desc->clnk_ctrl); + + omap_dma_start(c, c->desc); + c->paused = false; + } + + return 0; +} + +static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig) +{ + struct omap_chan *c; + + c = kzalloc(sizeof(*c), GFP_KERNEL); + if (!c) + return -ENOMEM; + + c->reg_map = od->reg_map; + c->dma_sig = dma_sig; + c->vc.desc_free = omap_dma_desc_free; + vchan_init(&c->vc, &od->ddev); + INIT_LIST_HEAD(&c->node); + + return 0; +} + +static void omap_dma_free(struct omap_dmadev *od) +{ + tasklet_kill(&od->task); + while (!list_empty(&od->ddev.channels)) { + struct omap_chan *c = list_first_entry(&od->ddev.channels, + struct omap_chan, vc.chan.device_node); + + list_del(&c->vc.chan.device_node); + tasklet_kill(&c->vc.task); + kfree(c); + } +} + +#define OMAP_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES)) + +static int omap_dma_probe(struct platform_device *pdev) +{ + struct omap_dmadev *od; + struct resource *res; + int rc, i, irq; + + od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL); + if (!od) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + od->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(od->base)) + return PTR_ERR(od->base); + + od->plat = omap_get_plat_info(); + if (!od->plat) + return -EPROBE_DEFER; + + od->reg_map = od->plat->reg_map; + + dma_cap_set(DMA_SLAVE, od->ddev.cap_mask); + dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask); + od->ddev.device_alloc_chan_resources = omap_dma_alloc_chan_resources; + od->ddev.device_free_chan_resources = omap_dma_free_chan_resources; + od->ddev.device_tx_status = omap_dma_tx_status; + od->ddev.device_issue_pending = omap_dma_issue_pending; + od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg; + od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic; + od->ddev.device_config = omap_dma_slave_config; + od->ddev.device_pause = omap_dma_pause; + od->ddev.device_resume = omap_dma_resume; + od->ddev.device_terminate_all = omap_dma_terminate_all; + od->ddev.src_addr_widths = OMAP_DMA_BUSWIDTHS; + od->ddev.dst_addr_widths = OMAP_DMA_BUSWIDTHS; + od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + od->ddev.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + od->ddev.dev = &pdev->dev; + INIT_LIST_HEAD(&od->ddev.channels); + INIT_LIST_HEAD(&od->pending); + spin_lock_init(&od->lock); + spin_lock_init(&od->irq_lock); + + tasklet_init(&od->task, omap_dma_sched, (unsigned long)od); + + for (i = 0; i < 127; i++) { + rc = omap_dma_chan_init(od, i); + if (rc) { + omap_dma_free(od); + return rc; + } + } + + irq = platform_get_irq(pdev, 1); + if (irq <= 0) { + dev_info(&pdev->dev, "failed to get L1 IRQ: %d\n", irq); + od->legacy = true; + } else { + /* Disable all interrupts */ + od->irq_enable_mask = 0; + omap_dma_glbl_write(od, IRQENABLE_L1, 0); + + rc = devm_request_irq(&pdev->dev, irq, omap_dma_irq, + IRQF_SHARED, "omap-dma-engine", od); + if (rc) + return rc; + } + + rc = dma_async_device_register(&od->ddev); + if (rc) { + pr_warn("OMAP-DMA: failed to register slave DMA engine device: %d\n", + rc); + omap_dma_free(od); + return rc; + } + + platform_set_drvdata(pdev, od); + + if (pdev->dev.of_node) { + omap_dma_info.dma_cap = od->ddev.cap_mask; + + /* Device-tree DMA controller registration */ + rc = of_dma_controller_register(pdev->dev.of_node, + of_dma_simple_xlate, &omap_dma_info); + if (rc) { + pr_warn("OMAP-DMA: failed to register DMA controller\n"); + dma_async_device_unregister(&od->ddev); + omap_dma_free(od); + } + } + + dev_info(&pdev->dev, "OMAP DMA engine driver\n"); + + return rc; +} + +static int omap_dma_remove(struct platform_device *pdev) +{ + struct omap_dmadev *od = platform_get_drvdata(pdev); + + if (pdev->dev.of_node) + of_dma_controller_free(pdev->dev.of_node); + + dma_async_device_unregister(&od->ddev); + + if (!od->legacy) { + /* Disable all interrupts */ + omap_dma_glbl_write(od, IRQENABLE_L0, 0); + } + + omap_dma_free(od); + + return 0; +} + +static const struct of_device_id omap_dma_match[] = { + { .compatible = "ti,omap2420-sdma", }, + { .compatible = "ti,omap2430-sdma", }, + { .compatible = "ti,omap3430-sdma", }, + { .compatible = "ti,omap3630-sdma", }, + { .compatible = "ti,omap4430-sdma", }, + {}, +}; +MODULE_DEVICE_TABLE(of, omap_dma_match); + +static struct platform_driver omap_dma_driver = { + .probe = omap_dma_probe, + .remove = omap_dma_remove, + .driver = { + .name = "omap-dma-engine", + .of_match_table = of_match_ptr(omap_dma_match), + }, +}; + +bool omap_dma_filter_fn(struct dma_chan *chan, void *param) +{ + if (chan->device->dev->driver == &omap_dma_driver.driver) { + struct omap_chan *c = to_omap_dma_chan(chan); + unsigned req = *(unsigned *)param; + + return req == c->dma_sig; + } + return false; +} +EXPORT_SYMBOL_GPL(omap_dma_filter_fn); + +static int omap_dma_init(void) +{ + return platform_driver_register(&omap_dma_driver); +} +subsys_initcall(omap_dma_init); + +static void __exit omap_dma_exit(void) +{ + platform_driver_unregister(&omap_dma_driver); +} +module_exit(omap_dma_exit); + +MODULE_AUTHOR("Russell King"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c new file mode 100644 index 000000000..b859792dd --- /dev/null +++ b/drivers/dma/pch_dma.c @@ -0,0 +1,1030 @@ +/* + * Topcliff PCH DMA controller driver + * Copyright (c) 2010 Intel Corporation + * Copyright (C) 2011 LAPIS Semiconductor Co., Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/pch_dma.h> + +#include "dmaengine.h" + +#define DRV_NAME "pch-dma" + +#define DMA_CTL0_DISABLE 0x0 +#define DMA_CTL0_SG 0x1 +#define DMA_CTL0_ONESHOT 0x2 +#define DMA_CTL0_MODE_MASK_BITS 0x3 +#define DMA_CTL0_DIR_SHIFT_BITS 2 +#define DMA_CTL0_BITS_PER_CH 4 + +#define DMA_CTL2_START_SHIFT_BITS 8 +#define DMA_CTL2_IRQ_ENABLE_MASK ((1UL << DMA_CTL2_START_SHIFT_BITS) - 1) + +#define DMA_STATUS_IDLE 0x0 +#define DMA_STATUS_DESC_READ 0x1 +#define DMA_STATUS_WAIT 0x2 +#define DMA_STATUS_ACCESS 0x3 +#define DMA_STATUS_BITS_PER_CH 2 +#define DMA_STATUS_MASK_BITS 0x3 +#define DMA_STATUS_SHIFT_BITS 16 +#define DMA_STATUS_IRQ(x) (0x1 << (x)) +#define DMA_STATUS0_ERR(x) (0x1 << ((x) + 8)) +#define DMA_STATUS2_ERR(x) (0x1 << (x)) + +#define DMA_DESC_WIDTH_SHIFT_BITS 12 +#define DMA_DESC_WIDTH_1_BYTE (0x3 << DMA_DESC_WIDTH_SHIFT_BITS) +#define DMA_DESC_WIDTH_2_BYTES (0x2 << DMA_DESC_WIDTH_SHIFT_BITS) +#define DMA_DESC_WIDTH_4_BYTES (0x0 << DMA_DESC_WIDTH_SHIFT_BITS) +#define DMA_DESC_MAX_COUNT_1_BYTE 0x3FF +#define DMA_DESC_MAX_COUNT_2_BYTES 0x3FF +#define DMA_DESC_MAX_COUNT_4_BYTES 0x7FF +#define DMA_DESC_END_WITHOUT_IRQ 0x0 +#define DMA_DESC_END_WITH_IRQ 0x1 +#define DMA_DESC_FOLLOW_WITHOUT_IRQ 0x2 +#define DMA_DESC_FOLLOW_WITH_IRQ 0x3 + +#define MAX_CHAN_NR 12 + +#define DMA_MASK_CTL0_MODE 0x33333333 +#define DMA_MASK_CTL2_MODE 0x00003333 + +static unsigned int init_nr_desc_per_channel = 64; +module_param(init_nr_desc_per_channel, uint, 0644); +MODULE_PARM_DESC(init_nr_desc_per_channel, + "initial descriptors per channel (default: 64)"); + +struct pch_dma_desc_regs { + u32 dev_addr; + u32 mem_addr; + u32 size; + u32 next; +}; + +struct pch_dma_regs { + u32 dma_ctl0; + u32 dma_ctl1; + u32 dma_ctl2; + u32 dma_ctl3; + u32 dma_sts0; + u32 dma_sts1; + u32 dma_sts2; + u32 reserved3; + struct pch_dma_desc_regs desc[MAX_CHAN_NR]; +}; + +struct pch_dma_desc { + struct pch_dma_desc_regs regs; + struct dma_async_tx_descriptor txd; + struct list_head desc_node; + struct list_head tx_list; +}; + +struct pch_dma_chan { + struct dma_chan chan; + void __iomem *membase; + enum dma_transfer_direction dir; + struct tasklet_struct tasklet; + unsigned long err_status; + + spinlock_t lock; + + struct list_head active_list; + struct list_head queue; + struct list_head free_list; + unsigned int descs_allocated; +}; + +#define PDC_DEV_ADDR 0x00 +#define PDC_MEM_ADDR 0x04 +#define PDC_SIZE 0x08 +#define PDC_NEXT 0x0C + +#define channel_readl(pdc, name) \ + readl((pdc)->membase + PDC_##name) +#define channel_writel(pdc, name, val) \ + writel((val), (pdc)->membase + PDC_##name) + +struct pch_dma { + struct dma_device dma; + void __iomem *membase; + struct pci_pool *pool; + struct pch_dma_regs regs; + struct pch_dma_desc_regs ch_regs[MAX_CHAN_NR]; + struct pch_dma_chan channels[MAX_CHAN_NR]; +}; + +#define PCH_DMA_CTL0 0x00 +#define PCH_DMA_CTL1 0x04 +#define PCH_DMA_CTL2 0x08 +#define PCH_DMA_CTL3 0x0C +#define PCH_DMA_STS0 0x10 +#define PCH_DMA_STS1 0x14 +#define PCH_DMA_STS2 0x18 + +#define dma_readl(pd, name) \ + readl((pd)->membase + PCH_DMA_##name) +#define dma_writel(pd, name, val) \ + writel((val), (pd)->membase + PCH_DMA_##name) + +static inline +struct pch_dma_desc *to_pd_desc(struct dma_async_tx_descriptor *txd) +{ + return container_of(txd, struct pch_dma_desc, txd); +} + +static inline struct pch_dma_chan *to_pd_chan(struct dma_chan *chan) +{ + return container_of(chan, struct pch_dma_chan, chan); +} + +static inline struct pch_dma *to_pd(struct dma_device *ddev) +{ + return container_of(ddev, struct pch_dma, dma); +} + +static inline struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} + +static inline struct device *chan2parent(struct dma_chan *chan) +{ + return chan->dev->device.parent; +} + +static inline +struct pch_dma_desc *pdc_first_active(struct pch_dma_chan *pd_chan) +{ + return list_first_entry(&pd_chan->active_list, + struct pch_dma_desc, desc_node); +} + +static inline +struct pch_dma_desc *pdc_first_queued(struct pch_dma_chan *pd_chan) +{ + return list_first_entry(&pd_chan->queue, + struct pch_dma_desc, desc_node); +} + +static void pdc_enable_irq(struct dma_chan *chan, int enable) +{ + struct pch_dma *pd = to_pd(chan->device); + u32 val; + int pos; + + if (chan->chan_id < 8) + pos = chan->chan_id; + else + pos = chan->chan_id + 8; + + val = dma_readl(pd, CTL2); + + if (enable) + val |= 0x1 << pos; + else + val &= ~(0x1 << pos); + + dma_writel(pd, CTL2, val); + + dev_dbg(chan2dev(chan), "pdc_enable_irq: chan %d -> %x\n", + chan->chan_id, val); +} + +static void pdc_set_dir(struct dma_chan *chan) +{ + struct pch_dma_chan *pd_chan = to_pd_chan(chan); + struct pch_dma *pd = to_pd(chan->device); + u32 val; + u32 mask_mode; + u32 mask_ctl; + + if (chan->chan_id < 8) { + val = dma_readl(pd, CTL0); + + mask_mode = DMA_CTL0_MODE_MASK_BITS << + (DMA_CTL0_BITS_PER_CH * chan->chan_id); + mask_ctl = DMA_MASK_CTL0_MODE & ~(DMA_CTL0_MODE_MASK_BITS << + (DMA_CTL0_BITS_PER_CH * chan->chan_id)); + val &= mask_mode; + if (pd_chan->dir == DMA_MEM_TO_DEV) + val |= 0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id + + DMA_CTL0_DIR_SHIFT_BITS); + else + val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id + + DMA_CTL0_DIR_SHIFT_BITS)); + + val |= mask_ctl; + dma_writel(pd, CTL0, val); + } else { + int ch = chan->chan_id - 8; /* ch8-->0 ch9-->1 ... ch11->3 */ + val = dma_readl(pd, CTL3); + + mask_mode = DMA_CTL0_MODE_MASK_BITS << + (DMA_CTL0_BITS_PER_CH * ch); + mask_ctl = DMA_MASK_CTL2_MODE & ~(DMA_CTL0_MODE_MASK_BITS << + (DMA_CTL0_BITS_PER_CH * ch)); + val &= mask_mode; + if (pd_chan->dir == DMA_MEM_TO_DEV) + val |= 0x1 << (DMA_CTL0_BITS_PER_CH * ch + + DMA_CTL0_DIR_SHIFT_BITS); + else + val &= ~(0x1 << (DMA_CTL0_BITS_PER_CH * ch + + DMA_CTL0_DIR_SHIFT_BITS)); + val |= mask_ctl; + dma_writel(pd, CTL3, val); + } + + dev_dbg(chan2dev(chan), "pdc_set_dir: chan %d -> %x\n", + chan->chan_id, val); +} + +static void pdc_set_mode(struct dma_chan *chan, u32 mode) +{ + struct pch_dma *pd = to_pd(chan->device); + u32 val; + u32 mask_ctl; + u32 mask_dir; + + if (chan->chan_id < 8) { + mask_ctl = DMA_MASK_CTL0_MODE & ~(DMA_CTL0_MODE_MASK_BITS << + (DMA_CTL0_BITS_PER_CH * chan->chan_id)); + mask_dir = 1 << (DMA_CTL0_BITS_PER_CH * chan->chan_id +\ + DMA_CTL0_DIR_SHIFT_BITS); + val = dma_readl(pd, CTL0); + val &= mask_dir; + val |= mode << (DMA_CTL0_BITS_PER_CH * chan->chan_id); + val |= mask_ctl; + dma_writel(pd, CTL0, val); + } else { + int ch = chan->chan_id - 8; /* ch8-->0 ch9-->1 ... ch11->3 */ + mask_ctl = DMA_MASK_CTL2_MODE & ~(DMA_CTL0_MODE_MASK_BITS << + (DMA_CTL0_BITS_PER_CH * ch)); + mask_dir = 1 << (DMA_CTL0_BITS_PER_CH * ch +\ + DMA_CTL0_DIR_SHIFT_BITS); + val = dma_readl(pd, CTL3); + val &= mask_dir; + val |= mode << (DMA_CTL0_BITS_PER_CH * ch); + val |= mask_ctl; + dma_writel(pd, CTL3, val); + } + + dev_dbg(chan2dev(chan), "pdc_set_mode: chan %d -> %x\n", + chan->chan_id, val); +} + +static u32 pdc_get_status0(struct pch_dma_chan *pd_chan) +{ + struct pch_dma *pd = to_pd(pd_chan->chan.device); + u32 val; + + val = dma_readl(pd, STS0); + return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS + + DMA_STATUS_BITS_PER_CH * pd_chan->chan.chan_id)); +} + +static u32 pdc_get_status2(struct pch_dma_chan *pd_chan) +{ + struct pch_dma *pd = to_pd(pd_chan->chan.device); + u32 val; + + val = dma_readl(pd, STS2); + return DMA_STATUS_MASK_BITS & (val >> (DMA_STATUS_SHIFT_BITS + + DMA_STATUS_BITS_PER_CH * (pd_chan->chan.chan_id - 8))); +} + +static bool pdc_is_idle(struct pch_dma_chan *pd_chan) +{ + u32 sts; + + if (pd_chan->chan.chan_id < 8) + sts = pdc_get_status0(pd_chan); + else + sts = pdc_get_status2(pd_chan); + + + if (sts == DMA_STATUS_IDLE) + return true; + else + return false; +} + +static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc) +{ + if (!pdc_is_idle(pd_chan)) { + dev_err(chan2dev(&pd_chan->chan), + "BUG: Attempt to start non-idle channel\n"); + return; + } + + dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> dev_addr: %x\n", + pd_chan->chan.chan_id, desc->regs.dev_addr); + dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> mem_addr: %x\n", + pd_chan->chan.chan_id, desc->regs.mem_addr); + dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> size: %x\n", + pd_chan->chan.chan_id, desc->regs.size); + dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> next: %x\n", + pd_chan->chan.chan_id, desc->regs.next); + + if (list_empty(&desc->tx_list)) { + channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr); + channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr); + channel_writel(pd_chan, SIZE, desc->regs.size); + channel_writel(pd_chan, NEXT, desc->regs.next); + pdc_set_mode(&pd_chan->chan, DMA_CTL0_ONESHOT); + } else { + channel_writel(pd_chan, NEXT, desc->txd.phys); + pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG); + } +} + +static void pdc_chain_complete(struct pch_dma_chan *pd_chan, + struct pch_dma_desc *desc) +{ + struct dma_async_tx_descriptor *txd = &desc->txd; + dma_async_tx_callback callback = txd->callback; + void *param = txd->callback_param; + + list_splice_init(&desc->tx_list, &pd_chan->free_list); + list_move(&desc->desc_node, &pd_chan->free_list); + + if (callback) + callback(param); +} + +static void pdc_complete_all(struct pch_dma_chan *pd_chan) +{ + struct pch_dma_desc *desc, *_d; + LIST_HEAD(list); + + BUG_ON(!pdc_is_idle(pd_chan)); + + if (!list_empty(&pd_chan->queue)) + pdc_dostart(pd_chan, pdc_first_queued(pd_chan)); + + list_splice_init(&pd_chan->active_list, &list); + list_splice_init(&pd_chan->queue, &pd_chan->active_list); + + list_for_each_entry_safe(desc, _d, &list, desc_node) + pdc_chain_complete(pd_chan, desc); +} + +static void pdc_handle_error(struct pch_dma_chan *pd_chan) +{ + struct pch_dma_desc *bad_desc; + + bad_desc = pdc_first_active(pd_chan); + list_del(&bad_desc->desc_node); + + list_splice_init(&pd_chan->queue, pd_chan->active_list.prev); + + if (!list_empty(&pd_chan->active_list)) + pdc_dostart(pd_chan, pdc_first_active(pd_chan)); + + dev_crit(chan2dev(&pd_chan->chan), "Bad descriptor submitted\n"); + dev_crit(chan2dev(&pd_chan->chan), "descriptor cookie: %d\n", + bad_desc->txd.cookie); + + pdc_chain_complete(pd_chan, bad_desc); +} + +static void pdc_advance_work(struct pch_dma_chan *pd_chan) +{ + if (list_empty(&pd_chan->active_list) || + list_is_singular(&pd_chan->active_list)) { + pdc_complete_all(pd_chan); + } else { + pdc_chain_complete(pd_chan, pdc_first_active(pd_chan)); + pdc_dostart(pd_chan, pdc_first_active(pd_chan)); + } +} + +static dma_cookie_t pd_tx_submit(struct dma_async_tx_descriptor *txd) +{ + struct pch_dma_desc *desc = to_pd_desc(txd); + struct pch_dma_chan *pd_chan = to_pd_chan(txd->chan); + dma_cookie_t cookie; + + spin_lock(&pd_chan->lock); + cookie = dma_cookie_assign(txd); + + if (list_empty(&pd_chan->active_list)) { + list_add_tail(&desc->desc_node, &pd_chan->active_list); + pdc_dostart(pd_chan, desc); + } else { + list_add_tail(&desc->desc_node, &pd_chan->queue); + } + + spin_unlock(&pd_chan->lock); + return 0; +} + +static struct pch_dma_desc *pdc_alloc_desc(struct dma_chan *chan, gfp_t flags) +{ + struct pch_dma_desc *desc = NULL; + struct pch_dma *pd = to_pd(chan->device); + dma_addr_t addr; + + desc = pci_pool_alloc(pd->pool, flags, &addr); + if (desc) { + memset(desc, 0, sizeof(struct pch_dma_desc)); + INIT_LIST_HEAD(&desc->tx_list); + dma_async_tx_descriptor_init(&desc->txd, chan); + desc->txd.tx_submit = pd_tx_submit; + desc->txd.flags = DMA_CTRL_ACK; + desc->txd.phys = addr; + } + + return desc; +} + +static struct pch_dma_desc *pdc_desc_get(struct pch_dma_chan *pd_chan) +{ + struct pch_dma_desc *desc, *_d; + struct pch_dma_desc *ret = NULL; + int i = 0; + + spin_lock(&pd_chan->lock); + list_for_each_entry_safe(desc, _d, &pd_chan->free_list, desc_node) { + i++; + if (async_tx_test_ack(&desc->txd)) { + list_del(&desc->desc_node); + ret = desc; + break; + } + dev_dbg(chan2dev(&pd_chan->chan), "desc %p not ACKed\n", desc); + } + spin_unlock(&pd_chan->lock); + dev_dbg(chan2dev(&pd_chan->chan), "scanned %d descriptors\n", i); + + if (!ret) { + ret = pdc_alloc_desc(&pd_chan->chan, GFP_ATOMIC); + if (ret) { + spin_lock(&pd_chan->lock); + pd_chan->descs_allocated++; + spin_unlock(&pd_chan->lock); + } else { + dev_err(chan2dev(&pd_chan->chan), + "failed to alloc desc\n"); + } + } + + return ret; +} + +static void pdc_desc_put(struct pch_dma_chan *pd_chan, + struct pch_dma_desc *desc) +{ + if (desc) { + spin_lock(&pd_chan->lock); + list_splice_init(&desc->tx_list, &pd_chan->free_list); + list_add(&desc->desc_node, &pd_chan->free_list); + spin_unlock(&pd_chan->lock); + } +} + +static int pd_alloc_chan_resources(struct dma_chan *chan) +{ + struct pch_dma_chan *pd_chan = to_pd_chan(chan); + struct pch_dma_desc *desc; + LIST_HEAD(tmp_list); + int i; + + if (!pdc_is_idle(pd_chan)) { + dev_dbg(chan2dev(chan), "DMA channel not idle ?\n"); + return -EIO; + } + + if (!list_empty(&pd_chan->free_list)) + return pd_chan->descs_allocated; + + for (i = 0; i < init_nr_desc_per_channel; i++) { + desc = pdc_alloc_desc(chan, GFP_KERNEL); + + if (!desc) { + dev_warn(chan2dev(chan), + "Only allocated %d initial descriptors\n", i); + break; + } + + list_add_tail(&desc->desc_node, &tmp_list); + } + + spin_lock_irq(&pd_chan->lock); + list_splice(&tmp_list, &pd_chan->free_list); + pd_chan->descs_allocated = i; + dma_cookie_init(chan); + spin_unlock_irq(&pd_chan->lock); + + pdc_enable_irq(chan, 1); + + return pd_chan->descs_allocated; +} + +static void pd_free_chan_resources(struct dma_chan *chan) +{ + struct pch_dma_chan *pd_chan = to_pd_chan(chan); + struct pch_dma *pd = to_pd(chan->device); + struct pch_dma_desc *desc, *_d; + LIST_HEAD(tmp_list); + + BUG_ON(!pdc_is_idle(pd_chan)); + BUG_ON(!list_empty(&pd_chan->active_list)); + BUG_ON(!list_empty(&pd_chan->queue)); + + spin_lock_irq(&pd_chan->lock); + list_splice_init(&pd_chan->free_list, &tmp_list); + pd_chan->descs_allocated = 0; + spin_unlock_irq(&pd_chan->lock); + + list_for_each_entry_safe(desc, _d, &tmp_list, desc_node) + pci_pool_free(pd->pool, desc, desc->txd.phys); + + pdc_enable_irq(chan, 0); +} + +static enum dma_status pd_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + return dma_cookie_status(chan, cookie, txstate); +} + +static void pd_issue_pending(struct dma_chan *chan) +{ + struct pch_dma_chan *pd_chan = to_pd_chan(chan); + + if (pdc_is_idle(pd_chan)) { + spin_lock(&pd_chan->lock); + pdc_advance_work(pd_chan); + spin_unlock(&pd_chan->lock); + } +} + +static struct dma_async_tx_descriptor *pd_prep_slave_sg(struct dma_chan *chan, + struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, + void *context) +{ + struct pch_dma_chan *pd_chan = to_pd_chan(chan); + struct pch_dma_slave *pd_slave = chan->private; + struct pch_dma_desc *first = NULL; + struct pch_dma_desc *prev = NULL; + struct pch_dma_desc *desc = NULL; + struct scatterlist *sg; + dma_addr_t reg; + int i; + + if (unlikely(!sg_len)) { + dev_info(chan2dev(chan), "prep_slave_sg: length is zero!\n"); + return NULL; + } + + if (direction == DMA_DEV_TO_MEM) + reg = pd_slave->rx_reg; + else if (direction == DMA_MEM_TO_DEV) + reg = pd_slave->tx_reg; + else + return NULL; + + pd_chan->dir = direction; + pdc_set_dir(chan); + + for_each_sg(sgl, sg, sg_len, i) { + desc = pdc_desc_get(pd_chan); + + if (!desc) + goto err_desc_get; + + desc->regs.dev_addr = reg; + desc->regs.mem_addr = sg_dma_address(sg); + desc->regs.size = sg_dma_len(sg); + desc->regs.next = DMA_DESC_FOLLOW_WITHOUT_IRQ; + + switch (pd_slave->width) { + case PCH_DMA_WIDTH_1_BYTE: + if (desc->regs.size > DMA_DESC_MAX_COUNT_1_BYTE) + goto err_desc_get; + desc->regs.size |= DMA_DESC_WIDTH_1_BYTE; + break; + case PCH_DMA_WIDTH_2_BYTES: + if (desc->regs.size > DMA_DESC_MAX_COUNT_2_BYTES) + goto err_desc_get; + desc->regs.size |= DMA_DESC_WIDTH_2_BYTES; + break; + case PCH_DMA_WIDTH_4_BYTES: + if (desc->regs.size > DMA_DESC_MAX_COUNT_4_BYTES) + goto err_desc_get; + desc->regs.size |= DMA_DESC_WIDTH_4_BYTES; + break; + default: + goto err_desc_get; + } + + if (!first) { + first = desc; + } else { + prev->regs.next |= desc->txd.phys; + list_add_tail(&desc->desc_node, &first->tx_list); + } + + prev = desc; + } + + if (flags & DMA_PREP_INTERRUPT) + desc->regs.next = DMA_DESC_END_WITH_IRQ; + else + desc->regs.next = DMA_DESC_END_WITHOUT_IRQ; + + first->txd.cookie = -EBUSY; + desc->txd.flags = flags; + + return &first->txd; + +err_desc_get: + dev_err(chan2dev(chan), "failed to get desc or wrong parameters\n"); + pdc_desc_put(pd_chan, first); + return NULL; +} + +static int pd_device_terminate_all(struct dma_chan *chan) +{ + struct pch_dma_chan *pd_chan = to_pd_chan(chan); + struct pch_dma_desc *desc, *_d; + LIST_HEAD(list); + + spin_lock_irq(&pd_chan->lock); + + pdc_set_mode(&pd_chan->chan, DMA_CTL0_DISABLE); + + list_splice_init(&pd_chan->active_list, &list); + list_splice_init(&pd_chan->queue, &list); + + list_for_each_entry_safe(desc, _d, &list, desc_node) + pdc_chain_complete(pd_chan, desc); + + spin_unlock_irq(&pd_chan->lock); + + return 0; +} + +static void pdc_tasklet(unsigned long data) +{ + struct pch_dma_chan *pd_chan = (struct pch_dma_chan *)data; + unsigned long flags; + + if (!pdc_is_idle(pd_chan)) { + dev_err(chan2dev(&pd_chan->chan), + "BUG: handle non-idle channel in tasklet\n"); + return; + } + + spin_lock_irqsave(&pd_chan->lock, flags); + if (test_and_clear_bit(0, &pd_chan->err_status)) + pdc_handle_error(pd_chan); + else + pdc_advance_work(pd_chan); + spin_unlock_irqrestore(&pd_chan->lock, flags); +} + +static irqreturn_t pd_irq(int irq, void *devid) +{ + struct pch_dma *pd = (struct pch_dma *)devid; + struct pch_dma_chan *pd_chan; + u32 sts0; + u32 sts2; + int i; + int ret0 = IRQ_NONE; + int ret2 = IRQ_NONE; + + sts0 = dma_readl(pd, STS0); + sts2 = dma_readl(pd, STS2); + + dev_dbg(pd->dma.dev, "pd_irq sts0: %x\n", sts0); + + for (i = 0; i < pd->dma.chancnt; i++) { + pd_chan = &pd->channels[i]; + + if (i < 8) { + if (sts0 & DMA_STATUS_IRQ(i)) { + if (sts0 & DMA_STATUS0_ERR(i)) + set_bit(0, &pd_chan->err_status); + + tasklet_schedule(&pd_chan->tasklet); + ret0 = IRQ_HANDLED; + } + } else { + if (sts2 & DMA_STATUS_IRQ(i - 8)) { + if (sts2 & DMA_STATUS2_ERR(i)) + set_bit(0, &pd_chan->err_status); + + tasklet_schedule(&pd_chan->tasklet); + ret2 = IRQ_HANDLED; + } + } + } + + /* clear interrupt bits in status register */ + if (ret0) + dma_writel(pd, STS0, sts0); + if (ret2) + dma_writel(pd, STS2, sts2); + + return ret0 | ret2; +} + +#ifdef CONFIG_PM +static void pch_dma_save_regs(struct pch_dma *pd) +{ + struct pch_dma_chan *pd_chan; + struct dma_chan *chan, *_c; + int i = 0; + + pd->regs.dma_ctl0 = dma_readl(pd, CTL0); + pd->regs.dma_ctl1 = dma_readl(pd, CTL1); + pd->regs.dma_ctl2 = dma_readl(pd, CTL2); + pd->regs.dma_ctl3 = dma_readl(pd, CTL3); + + list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) { + pd_chan = to_pd_chan(chan); + + pd->ch_regs[i].dev_addr = channel_readl(pd_chan, DEV_ADDR); + pd->ch_regs[i].mem_addr = channel_readl(pd_chan, MEM_ADDR); + pd->ch_regs[i].size = channel_readl(pd_chan, SIZE); + pd->ch_regs[i].next = channel_readl(pd_chan, NEXT); + + i++; + } +} + +static void pch_dma_restore_regs(struct pch_dma *pd) +{ + struct pch_dma_chan *pd_chan; + struct dma_chan *chan, *_c; + int i = 0; + + dma_writel(pd, CTL0, pd->regs.dma_ctl0); + dma_writel(pd, CTL1, pd->regs.dma_ctl1); + dma_writel(pd, CTL2, pd->regs.dma_ctl2); + dma_writel(pd, CTL3, pd->regs.dma_ctl3); + + list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) { + pd_chan = to_pd_chan(chan); + + channel_writel(pd_chan, DEV_ADDR, pd->ch_regs[i].dev_addr); + channel_writel(pd_chan, MEM_ADDR, pd->ch_regs[i].mem_addr); + channel_writel(pd_chan, SIZE, pd->ch_regs[i].size); + channel_writel(pd_chan, NEXT, pd->ch_regs[i].next); + + i++; + } +} + +static int pch_dma_suspend(struct pci_dev *pdev, pm_message_t state) +{ + struct pch_dma *pd = pci_get_drvdata(pdev); + + if (pd) + pch_dma_save_regs(pd); + + pci_save_state(pdev); + pci_disable_device(pdev); + pci_set_power_state(pdev, pci_choose_state(pdev, state)); + + return 0; +} + +static int pch_dma_resume(struct pci_dev *pdev) +{ + struct pch_dma *pd = pci_get_drvdata(pdev); + int err; + + pci_set_power_state(pdev, PCI_D0); + pci_restore_state(pdev); + + err = pci_enable_device(pdev); + if (err) { + dev_dbg(&pdev->dev, "failed to enable device\n"); + return err; + } + + if (pd) + pch_dma_restore_regs(pd); + + return 0; +} +#endif + +static int pch_dma_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + struct pch_dma *pd; + struct pch_dma_regs *regs; + unsigned int nr_channels; + int err; + int i; + + nr_channels = id->driver_data; + pd = kzalloc(sizeof(*pd), GFP_KERNEL); + if (!pd) + return -ENOMEM; + + pci_set_drvdata(pdev, pd); + + err = pci_enable_device(pdev); + if (err) { + dev_err(&pdev->dev, "Cannot enable PCI device\n"); + goto err_free_mem; + } + + if (!(pci_resource_flags(pdev, 1) & IORESOURCE_MEM)) { + dev_err(&pdev->dev, "Cannot find proper base address\n"); + err = -ENODEV; + goto err_disable_pdev; + } + + err = pci_request_regions(pdev, DRV_NAME); + if (err) { + dev_err(&pdev->dev, "Cannot obtain PCI resources\n"); + goto err_disable_pdev; + } + + err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (err) { + dev_err(&pdev->dev, "Cannot set proper DMA config\n"); + goto err_free_res; + } + + regs = pd->membase = pci_iomap(pdev, 1, 0); + if (!pd->membase) { + dev_err(&pdev->dev, "Cannot map MMIO registers\n"); + err = -ENOMEM; + goto err_free_res; + } + + pci_set_master(pdev); + + err = request_irq(pdev->irq, pd_irq, IRQF_SHARED, DRV_NAME, pd); + if (err) { + dev_err(&pdev->dev, "Failed to request IRQ\n"); + goto err_iounmap; + } + + pd->pool = pci_pool_create("pch_dma_desc_pool", pdev, + sizeof(struct pch_dma_desc), 4, 0); + if (!pd->pool) { + dev_err(&pdev->dev, "Failed to alloc DMA descriptors\n"); + err = -ENOMEM; + goto err_free_irq; + } + + pd->dma.dev = &pdev->dev; + + INIT_LIST_HEAD(&pd->dma.channels); + + for (i = 0; i < nr_channels; i++) { + struct pch_dma_chan *pd_chan = &pd->channels[i]; + + pd_chan->chan.device = &pd->dma; + dma_cookie_init(&pd_chan->chan); + + pd_chan->membase = ®s->desc[i]; + + spin_lock_init(&pd_chan->lock); + + INIT_LIST_HEAD(&pd_chan->active_list); + INIT_LIST_HEAD(&pd_chan->queue); + INIT_LIST_HEAD(&pd_chan->free_list); + + tasklet_init(&pd_chan->tasklet, pdc_tasklet, + (unsigned long)pd_chan); + list_add_tail(&pd_chan->chan.device_node, &pd->dma.channels); + } + + dma_cap_zero(pd->dma.cap_mask); + dma_cap_set(DMA_PRIVATE, pd->dma.cap_mask); + dma_cap_set(DMA_SLAVE, pd->dma.cap_mask); + + pd->dma.device_alloc_chan_resources = pd_alloc_chan_resources; + pd->dma.device_free_chan_resources = pd_free_chan_resources; + pd->dma.device_tx_status = pd_tx_status; + pd->dma.device_issue_pending = pd_issue_pending; + pd->dma.device_prep_slave_sg = pd_prep_slave_sg; + pd->dma.device_terminate_all = pd_device_terminate_all; + + err = dma_async_device_register(&pd->dma); + if (err) { + dev_err(&pdev->dev, "Failed to register DMA device\n"); + goto err_free_pool; + } + + return 0; + +err_free_pool: + pci_pool_destroy(pd->pool); +err_free_irq: + free_irq(pdev->irq, pd); +err_iounmap: + pci_iounmap(pdev, pd->membase); +err_free_res: + pci_release_regions(pdev); +err_disable_pdev: + pci_disable_device(pdev); +err_free_mem: + kfree(pd); + return err; +} + +static void pch_dma_remove(struct pci_dev *pdev) +{ + struct pch_dma *pd = pci_get_drvdata(pdev); + struct pch_dma_chan *pd_chan; + struct dma_chan *chan, *_c; + + if (pd) { + dma_async_device_unregister(&pd->dma); + + free_irq(pdev->irq, pd); + + list_for_each_entry_safe(chan, _c, &pd->dma.channels, + device_node) { + pd_chan = to_pd_chan(chan); + + tasklet_kill(&pd_chan->tasklet); + } + + pci_pool_destroy(pd->pool); + pci_iounmap(pdev, pd->membase); + pci_release_regions(pdev); + pci_disable_device(pdev); + kfree(pd); + } +} + +/* PCI Device ID of DMA device */ +#define PCI_VENDOR_ID_ROHM 0x10DB +#define PCI_DEVICE_ID_EG20T_PCH_DMA_8CH 0x8810 +#define PCI_DEVICE_ID_EG20T_PCH_DMA_4CH 0x8815 +#define PCI_DEVICE_ID_ML7213_DMA1_8CH 0x8026 +#define PCI_DEVICE_ID_ML7213_DMA2_8CH 0x802B +#define PCI_DEVICE_ID_ML7213_DMA3_4CH 0x8034 +#define PCI_DEVICE_ID_ML7213_DMA4_12CH 0x8032 +#define PCI_DEVICE_ID_ML7223_DMA1_4CH 0x800B +#define PCI_DEVICE_ID_ML7223_DMA2_4CH 0x800E +#define PCI_DEVICE_ID_ML7223_DMA3_4CH 0x8017 +#define PCI_DEVICE_ID_ML7223_DMA4_4CH 0x803B +#define PCI_DEVICE_ID_ML7831_DMA1_8CH 0x8810 +#define PCI_DEVICE_ID_ML7831_DMA2_4CH 0x8815 + +static const struct pci_device_id pch_dma_id_table[] = { + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), 8 }, + { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), 4 }, + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA1_8CH), 8}, /* UART Video */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA2_8CH), 8}, /* PCMIF SPI */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA3_4CH), 4}, /* FPGA */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA4_12CH), 12}, /* I2S */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA1_4CH), 4}, /* UART */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA2_4CH), 4}, /* Video SPI */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA3_4CH), 4}, /* Security */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7223_DMA4_4CH), 4}, /* FPGA */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA1_8CH), 8}, /* UART */ + { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7831_DMA2_4CH), 4}, /* SPI */ + { 0, }, +}; + +static struct pci_driver pch_dma_driver = { + .name = DRV_NAME, + .id_table = pch_dma_id_table, + .probe = pch_dma_probe, + .remove = pch_dma_remove, +#ifdef CONFIG_PM + .suspend = pch_dma_suspend, + .resume = pch_dma_resume, +#endif +}; + +module_pci_driver(pch_dma_driver); + +MODULE_DESCRIPTION("Intel EG20T PCH / LAPIS Semicon ML7213/ML7223/ML7831 IOH " + "DMA controller driver"); +MODULE_AUTHOR("Yong Wang <yong.y.wang@intel.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_DEVICE_TABLE(pci, pch_dma_id_table); diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c new file mode 100644 index 000000000..340f9e607 --- /dev/null +++ b/drivers/dma/pl330.c @@ -0,0 +1,3009 @@ +/* + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Copyright (C) 2010 Samsung Electronics Co. Ltd. + * Jaswinder Singh <jassi.brar@samsung.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/string.h> +#include <linux/delay.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/amba/bus.h> +#include <linux/amba/pl330.h> +#include <linux/scatterlist.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/err.h> +#include <linux/pm_runtime.h> + +#include "dmaengine.h" +#define PL330_MAX_CHAN 8 +#define PL330_MAX_IRQS 32 +#define PL330_MAX_PERI 32 + +enum pl330_cachectrl { + CCTRL0, /* Noncacheable and nonbufferable */ + CCTRL1, /* Bufferable only */ + CCTRL2, /* Cacheable, but do not allocate */ + CCTRL3, /* Cacheable and bufferable, but do not allocate */ + INVALID1, /* AWCACHE = 0x1000 */ + INVALID2, + CCTRL6, /* Cacheable write-through, allocate on writes only */ + CCTRL7, /* Cacheable write-back, allocate on writes only */ +}; + +enum pl330_byteswap { + SWAP_NO, + SWAP_2, + SWAP_4, + SWAP_8, + SWAP_16, +}; + +/* Register and Bit field Definitions */ +#define DS 0x0 +#define DS_ST_STOP 0x0 +#define DS_ST_EXEC 0x1 +#define DS_ST_CMISS 0x2 +#define DS_ST_UPDTPC 0x3 +#define DS_ST_WFE 0x4 +#define DS_ST_ATBRR 0x5 +#define DS_ST_QBUSY 0x6 +#define DS_ST_WFP 0x7 +#define DS_ST_KILL 0x8 +#define DS_ST_CMPLT 0x9 +#define DS_ST_FLTCMP 0xe +#define DS_ST_FAULT 0xf + +#define DPC 0x4 +#define INTEN 0x20 +#define ES 0x24 +#define INTSTATUS 0x28 +#define INTCLR 0x2c +#define FSM 0x30 +#define FSC 0x34 +#define FTM 0x38 + +#define _FTC 0x40 +#define FTC(n) (_FTC + (n)*0x4) + +#define _CS 0x100 +#define CS(n) (_CS + (n)*0x8) +#define CS_CNS (1 << 21) + +#define _CPC 0x104 +#define CPC(n) (_CPC + (n)*0x8) + +#define _SA 0x400 +#define SA(n) (_SA + (n)*0x20) + +#define _DA 0x404 +#define DA(n) (_DA + (n)*0x20) + +#define _CC 0x408 +#define CC(n) (_CC + (n)*0x20) + +#define CC_SRCINC (1 << 0) +#define CC_DSTINC (1 << 14) +#define CC_SRCPRI (1 << 8) +#define CC_DSTPRI (1 << 22) +#define CC_SRCNS (1 << 9) +#define CC_DSTNS (1 << 23) +#define CC_SRCIA (1 << 10) +#define CC_DSTIA (1 << 24) +#define CC_SRCBRSTLEN_SHFT 4 +#define CC_DSTBRSTLEN_SHFT 18 +#define CC_SRCBRSTSIZE_SHFT 1 +#define CC_DSTBRSTSIZE_SHFT 15 +#define CC_SRCCCTRL_SHFT 11 +#define CC_SRCCCTRL_MASK 0x7 +#define CC_DSTCCTRL_SHFT 25 +#define CC_DRCCCTRL_MASK 0x7 +#define CC_SWAP_SHFT 28 + +#define _LC0 0x40c +#define LC0(n) (_LC0 + (n)*0x20) + +#define _LC1 0x410 +#define LC1(n) (_LC1 + (n)*0x20) + +#define DBGSTATUS 0xd00 +#define DBG_BUSY (1 << 0) + +#define DBGCMD 0xd04 +#define DBGINST0 0xd08 +#define DBGINST1 0xd0c + +#define CR0 0xe00 +#define CR1 0xe04 +#define CR2 0xe08 +#define CR3 0xe0c +#define CR4 0xe10 +#define CRD 0xe14 + +#define PERIPH_ID 0xfe0 +#define PERIPH_REV_SHIFT 20 +#define PERIPH_REV_MASK 0xf +#define PERIPH_REV_R0P0 0 +#define PERIPH_REV_R1P0 1 +#define PERIPH_REV_R1P1 2 + +#define CR0_PERIPH_REQ_SET (1 << 0) +#define CR0_BOOT_EN_SET (1 << 1) +#define CR0_BOOT_MAN_NS (1 << 2) +#define CR0_NUM_CHANS_SHIFT 4 +#define CR0_NUM_CHANS_MASK 0x7 +#define CR0_NUM_PERIPH_SHIFT 12 +#define CR0_NUM_PERIPH_MASK 0x1f +#define CR0_NUM_EVENTS_SHIFT 17 +#define CR0_NUM_EVENTS_MASK 0x1f + +#define CR1_ICACHE_LEN_SHIFT 0 +#define CR1_ICACHE_LEN_MASK 0x7 +#define CR1_NUM_ICACHELINES_SHIFT 4 +#define CR1_NUM_ICACHELINES_MASK 0xf + +#define CRD_DATA_WIDTH_SHIFT 0 +#define CRD_DATA_WIDTH_MASK 0x7 +#define CRD_WR_CAP_SHIFT 4 +#define CRD_WR_CAP_MASK 0x7 +#define CRD_WR_Q_DEP_SHIFT 8 +#define CRD_WR_Q_DEP_MASK 0xf +#define CRD_RD_CAP_SHIFT 12 +#define CRD_RD_CAP_MASK 0x7 +#define CRD_RD_Q_DEP_SHIFT 16 +#define CRD_RD_Q_DEP_MASK 0xf +#define CRD_DATA_BUFF_SHIFT 20 +#define CRD_DATA_BUFF_MASK 0x3ff + +#define PART 0x330 +#define DESIGNER 0x41 +#define REVISION 0x0 +#define INTEG_CFG 0x0 +#define PERIPH_ID_VAL ((PART << 0) | (DESIGNER << 12)) + +#define PL330_STATE_STOPPED (1 << 0) +#define PL330_STATE_EXECUTING (1 << 1) +#define PL330_STATE_WFE (1 << 2) +#define PL330_STATE_FAULTING (1 << 3) +#define PL330_STATE_COMPLETING (1 << 4) +#define PL330_STATE_WFP (1 << 5) +#define PL330_STATE_KILLING (1 << 6) +#define PL330_STATE_FAULT_COMPLETING (1 << 7) +#define PL330_STATE_CACHEMISS (1 << 8) +#define PL330_STATE_UPDTPC (1 << 9) +#define PL330_STATE_ATBARRIER (1 << 10) +#define PL330_STATE_QUEUEBUSY (1 << 11) +#define PL330_STATE_INVALID (1 << 15) + +#define PL330_STABLE_STATES (PL330_STATE_STOPPED | PL330_STATE_EXECUTING \ + | PL330_STATE_WFE | PL330_STATE_FAULTING) + +#define CMD_DMAADDH 0x54 +#define CMD_DMAEND 0x00 +#define CMD_DMAFLUSHP 0x35 +#define CMD_DMAGO 0xa0 +#define CMD_DMALD 0x04 +#define CMD_DMALDP 0x25 +#define CMD_DMALP 0x20 +#define CMD_DMALPEND 0x28 +#define CMD_DMAKILL 0x01 +#define CMD_DMAMOV 0xbc +#define CMD_DMANOP 0x18 +#define CMD_DMARMB 0x12 +#define CMD_DMASEV 0x34 +#define CMD_DMAST 0x08 +#define CMD_DMASTP 0x29 +#define CMD_DMASTZ 0x0c +#define CMD_DMAWFE 0x36 +#define CMD_DMAWFP 0x30 +#define CMD_DMAWMB 0x13 + +#define SZ_DMAADDH 3 +#define SZ_DMAEND 1 +#define SZ_DMAFLUSHP 2 +#define SZ_DMALD 1 +#define SZ_DMALDP 2 +#define SZ_DMALP 2 +#define SZ_DMALPEND 2 +#define SZ_DMAKILL 1 +#define SZ_DMAMOV 6 +#define SZ_DMANOP 1 +#define SZ_DMARMB 1 +#define SZ_DMASEV 2 +#define SZ_DMAST 1 +#define SZ_DMASTP 2 +#define SZ_DMASTZ 1 +#define SZ_DMAWFE 2 +#define SZ_DMAWFP 2 +#define SZ_DMAWMB 1 +#define SZ_DMAGO 6 + +#define BRST_LEN(ccr) ((((ccr) >> CC_SRCBRSTLEN_SHFT) & 0xf) + 1) +#define BRST_SIZE(ccr) (1 << (((ccr) >> CC_SRCBRSTSIZE_SHFT) & 0x7)) + +#define BYTE_TO_BURST(b, ccr) ((b) / BRST_SIZE(ccr) / BRST_LEN(ccr)) +#define BURST_TO_BYTE(c, ccr) ((c) * BRST_SIZE(ccr) * BRST_LEN(ccr)) + +/* + * With 256 bytes, we can do more than 2.5MB and 5MB xfers per req + * at 1byte/burst for P<->M and M<->M respectively. + * For typical scenario, at 1word/burst, 10MB and 20MB xfers per req + * should be enough for P<->M and M<->M respectively. + */ +#define MCODE_BUFF_PER_REQ 256 + +/* Use this _only_ to wait on transient states */ +#define UNTIL(t, s) while (!(_state(t) & (s))) cpu_relax(); + +#ifdef PL330_DEBUG_MCGEN +static unsigned cmd_line; +#define PL330_DBGCMD_DUMP(off, x...) do { \ + printk("%x:", cmd_line); \ + printk(x); \ + cmd_line += off; \ + } while (0) +#define PL330_DBGMC_START(addr) (cmd_line = addr) +#else +#define PL330_DBGCMD_DUMP(off, x...) do {} while (0) +#define PL330_DBGMC_START(addr) do {} while (0) +#endif + +/* The number of default descriptors */ + +#define NR_DEFAULT_DESC 16 + +/* Delay for runtime PM autosuspend, ms */ +#define PL330_AUTOSUSPEND_DELAY 20 + +/* Populated by the PL330 core driver for DMA API driver's info */ +struct pl330_config { + u32 periph_id; +#define DMAC_MODE_NS (1 << 0) + unsigned int mode; + unsigned int data_bus_width:10; /* In number of bits */ + unsigned int data_buf_dep:11; + unsigned int num_chan:4; + unsigned int num_peri:6; + u32 peri_ns; + unsigned int num_events:6; + u32 irq_ns; +}; + +/** + * Request Configuration. + * The PL330 core does not modify this and uses the last + * working configuration if the request doesn't provide any. + * + * The Client may want to provide this info only for the + * first request and a request with new settings. + */ +struct pl330_reqcfg { + /* Address Incrementing */ + unsigned dst_inc:1; + unsigned src_inc:1; + + /* + * For now, the SRC & DST protection levels + * and burst size/length are assumed same. + */ + bool nonsecure; + bool privileged; + bool insnaccess; + unsigned brst_len:5; + unsigned brst_size:3; /* in power of 2 */ + + enum pl330_cachectrl dcctl; + enum pl330_cachectrl scctl; + enum pl330_byteswap swap; + struct pl330_config *pcfg; +}; + +/* + * One cycle of DMAC operation. + * There may be more than one xfer in a request. + */ +struct pl330_xfer { + u32 src_addr; + u32 dst_addr; + /* Size to xfer */ + u32 bytes; +}; + +/* The xfer callbacks are made with one of these arguments. */ +enum pl330_op_err { + /* The all xfers in the request were success. */ + PL330_ERR_NONE, + /* If req aborted due to global error. */ + PL330_ERR_ABORT, + /* If req failed due to problem with Channel. */ + PL330_ERR_FAIL, +}; + +enum dmamov_dst { + SAR = 0, + CCR, + DAR, +}; + +enum pl330_dst { + SRC = 0, + DST, +}; + +enum pl330_cond { + SINGLE, + BURST, + ALWAYS, +}; + +struct dma_pl330_desc; + +struct _pl330_req { + u32 mc_bus; + void *mc_cpu; + struct dma_pl330_desc *desc; +}; + +/* ToBeDone for tasklet */ +struct _pl330_tbd { + bool reset_dmac; + bool reset_mngr; + u8 reset_chan; +}; + +/* A DMAC Thread */ +struct pl330_thread { + u8 id; + int ev; + /* If the channel is not yet acquired by any client */ + bool free; + /* Parent DMAC */ + struct pl330_dmac *dmac; + /* Only two at a time */ + struct _pl330_req req[2]; + /* Index of the last enqueued request */ + unsigned lstenq; + /* Index of the last submitted request or -1 if the DMA is stopped */ + int req_running; +}; + +enum pl330_dmac_state { + UNINIT, + INIT, + DYING, +}; + +enum desc_status { + /* In the DMAC pool */ + FREE, + /* + * Allocated to some channel during prep_xxx + * Also may be sitting on the work_list. + */ + PREP, + /* + * Sitting on the work_list and already submitted + * to the PL330 core. Not more than two descriptors + * of a channel can be BUSY at any time. + */ + BUSY, + /* + * Sitting on the channel work_list but xfer done + * by PL330 core + */ + DONE, +}; + +struct dma_pl330_chan { + /* Schedule desc completion */ + struct tasklet_struct task; + + /* DMA-Engine Channel */ + struct dma_chan chan; + + /* List of submitted descriptors */ + struct list_head submitted_list; + /* List of issued descriptors */ + struct list_head work_list; + /* List of completed descriptors */ + struct list_head completed_list; + + /* Pointer to the DMAC that manages this channel, + * NULL if the channel is available to be acquired. + * As the parent, this DMAC also provides descriptors + * to the channel. + */ + struct pl330_dmac *dmac; + + /* To protect channel manipulation */ + spinlock_t lock; + + /* + * Hardware channel thread of PL330 DMAC. NULL if the channel is + * available. + */ + struct pl330_thread *thread; + + /* For D-to-M and M-to-D channels */ + int burst_sz; /* the peripheral fifo width */ + int burst_len; /* the number of burst */ + dma_addr_t fifo_addr; + + /* for cyclic capability */ + bool cyclic; +}; + +struct pl330_dmac { + /* DMA-Engine Device */ + struct dma_device ddma; + + /* Holds info about sg limitations */ + struct device_dma_parameters dma_parms; + + /* Pool of descriptors available for the DMAC's channels */ + struct list_head desc_pool; + /* To protect desc_pool manipulation */ + spinlock_t pool_lock; + + /* Size of MicroCode buffers for each channel. */ + unsigned mcbufsz; + /* ioremap'ed address of PL330 registers. */ + void __iomem *base; + /* Populated by the PL330 core driver during pl330_add */ + struct pl330_config pcfg; + + spinlock_t lock; + /* Maximum possible events/irqs */ + int events[32]; + /* BUS address of MicroCode buffer */ + dma_addr_t mcode_bus; + /* CPU address of MicroCode buffer */ + void *mcode_cpu; + /* List of all Channel threads */ + struct pl330_thread *channels; + /* Pointer to the MANAGER thread */ + struct pl330_thread *manager; + /* To handle bad news in interrupt */ + struct tasklet_struct tasks; + struct _pl330_tbd dmac_tbd; + /* State of DMAC operation */ + enum pl330_dmac_state state; + /* Holds list of reqs with due callbacks */ + struct list_head req_done; + + /* Peripheral channels connected to this DMAC */ + unsigned int num_peripherals; + struct dma_pl330_chan *peripherals; /* keep at end */ +}; + +struct dma_pl330_desc { + /* To attach to a queue as child */ + struct list_head node; + + /* Descriptor for the DMA Engine API */ + struct dma_async_tx_descriptor txd; + + /* Xfer for PL330 core */ + struct pl330_xfer px; + + struct pl330_reqcfg rqcfg; + + enum desc_status status; + + int bytes_requested; + bool last; + + /* The channel which currently holds this desc */ + struct dma_pl330_chan *pchan; + + enum dma_transfer_direction rqtype; + /* Index of peripheral for the xfer. */ + unsigned peri:5; + /* Hook to attach to DMAC's list of reqs with due callback */ + struct list_head rqd; +}; + +struct _xfer_spec { + u32 ccr; + struct dma_pl330_desc *desc; +}; + +static inline bool _queue_empty(struct pl330_thread *thrd) +{ + return thrd->req[0].desc == NULL && thrd->req[1].desc == NULL; +} + +static inline bool _queue_full(struct pl330_thread *thrd) +{ + return thrd->req[0].desc != NULL && thrd->req[1].desc != NULL; +} + +static inline bool is_manager(struct pl330_thread *thrd) +{ + return thrd->dmac->manager == thrd; +} + +/* If manager of the thread is in Non-Secure mode */ +static inline bool _manager_ns(struct pl330_thread *thrd) +{ + return (thrd->dmac->pcfg.mode & DMAC_MODE_NS) ? true : false; +} + +static inline u32 get_revision(u32 periph_id) +{ + return (periph_id >> PERIPH_REV_SHIFT) & PERIPH_REV_MASK; +} + +static inline u32 _emit_ADDH(unsigned dry_run, u8 buf[], + enum pl330_dst da, u16 val) +{ + if (dry_run) + return SZ_DMAADDH; + + buf[0] = CMD_DMAADDH; + buf[0] |= (da << 1); + *((__le16 *)&buf[1]) = cpu_to_le16(val); + + PL330_DBGCMD_DUMP(SZ_DMAADDH, "\tDMAADDH %s %u\n", + da == 1 ? "DA" : "SA", val); + + return SZ_DMAADDH; +} + +static inline u32 _emit_END(unsigned dry_run, u8 buf[]) +{ + if (dry_run) + return SZ_DMAEND; + + buf[0] = CMD_DMAEND; + + PL330_DBGCMD_DUMP(SZ_DMAEND, "\tDMAEND\n"); + + return SZ_DMAEND; +} + +static inline u32 _emit_FLUSHP(unsigned dry_run, u8 buf[], u8 peri) +{ + if (dry_run) + return SZ_DMAFLUSHP; + + buf[0] = CMD_DMAFLUSHP; + + peri &= 0x1f; + peri <<= 3; + buf[1] = peri; + + PL330_DBGCMD_DUMP(SZ_DMAFLUSHP, "\tDMAFLUSHP %u\n", peri >> 3); + + return SZ_DMAFLUSHP; +} + +static inline u32 _emit_LD(unsigned dry_run, u8 buf[], enum pl330_cond cond) +{ + if (dry_run) + return SZ_DMALD; + + buf[0] = CMD_DMALD; + + if (cond == SINGLE) + buf[0] |= (0 << 1) | (1 << 0); + else if (cond == BURST) + buf[0] |= (1 << 1) | (1 << 0); + + PL330_DBGCMD_DUMP(SZ_DMALD, "\tDMALD%c\n", + cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A')); + + return SZ_DMALD; +} + +static inline u32 _emit_LDP(unsigned dry_run, u8 buf[], + enum pl330_cond cond, u8 peri) +{ + if (dry_run) + return SZ_DMALDP; + + buf[0] = CMD_DMALDP; + + if (cond == BURST) + buf[0] |= (1 << 1); + + peri &= 0x1f; + peri <<= 3; + buf[1] = peri; + + PL330_DBGCMD_DUMP(SZ_DMALDP, "\tDMALDP%c %u\n", + cond == SINGLE ? 'S' : 'B', peri >> 3); + + return SZ_DMALDP; +} + +static inline u32 _emit_LP(unsigned dry_run, u8 buf[], + unsigned loop, u8 cnt) +{ + if (dry_run) + return SZ_DMALP; + + buf[0] = CMD_DMALP; + + if (loop) + buf[0] |= (1 << 1); + + cnt--; /* DMAC increments by 1 internally */ + buf[1] = cnt; + + PL330_DBGCMD_DUMP(SZ_DMALP, "\tDMALP_%c %u\n", loop ? '1' : '0', cnt); + + return SZ_DMALP; +} + +struct _arg_LPEND { + enum pl330_cond cond; + bool forever; + unsigned loop; + u8 bjump; +}; + +static inline u32 _emit_LPEND(unsigned dry_run, u8 buf[], + const struct _arg_LPEND *arg) +{ + enum pl330_cond cond = arg->cond; + bool forever = arg->forever; + unsigned loop = arg->loop; + u8 bjump = arg->bjump; + + if (dry_run) + return SZ_DMALPEND; + + buf[0] = CMD_DMALPEND; + + if (loop) + buf[0] |= (1 << 2); + + if (!forever) + buf[0] |= (1 << 4); + + if (cond == SINGLE) + buf[0] |= (0 << 1) | (1 << 0); + else if (cond == BURST) + buf[0] |= (1 << 1) | (1 << 0); + + buf[1] = bjump; + + PL330_DBGCMD_DUMP(SZ_DMALPEND, "\tDMALP%s%c_%c bjmpto_%x\n", + forever ? "FE" : "END", + cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A'), + loop ? '1' : '0', + bjump); + + return SZ_DMALPEND; +} + +static inline u32 _emit_KILL(unsigned dry_run, u8 buf[]) +{ + if (dry_run) + return SZ_DMAKILL; + + buf[0] = CMD_DMAKILL; + + return SZ_DMAKILL; +} + +static inline u32 _emit_MOV(unsigned dry_run, u8 buf[], + enum dmamov_dst dst, u32 val) +{ + if (dry_run) + return SZ_DMAMOV; + + buf[0] = CMD_DMAMOV; + buf[1] = dst; + *((__le32 *)&buf[2]) = cpu_to_le32(val); + + PL330_DBGCMD_DUMP(SZ_DMAMOV, "\tDMAMOV %s 0x%x\n", + dst == SAR ? "SAR" : (dst == DAR ? "DAR" : "CCR"), val); + + return SZ_DMAMOV; +} + +static inline u32 _emit_NOP(unsigned dry_run, u8 buf[]) +{ + if (dry_run) + return SZ_DMANOP; + + buf[0] = CMD_DMANOP; + + PL330_DBGCMD_DUMP(SZ_DMANOP, "\tDMANOP\n"); + + return SZ_DMANOP; +} + +static inline u32 _emit_RMB(unsigned dry_run, u8 buf[]) +{ + if (dry_run) + return SZ_DMARMB; + + buf[0] = CMD_DMARMB; + + PL330_DBGCMD_DUMP(SZ_DMARMB, "\tDMARMB\n"); + + return SZ_DMARMB; +} + +static inline u32 _emit_SEV(unsigned dry_run, u8 buf[], u8 ev) +{ + if (dry_run) + return SZ_DMASEV; + + buf[0] = CMD_DMASEV; + + ev &= 0x1f; + ev <<= 3; + buf[1] = ev; + + PL330_DBGCMD_DUMP(SZ_DMASEV, "\tDMASEV %u\n", ev >> 3); + + return SZ_DMASEV; +} + +static inline u32 _emit_ST(unsigned dry_run, u8 buf[], enum pl330_cond cond) +{ + if (dry_run) + return SZ_DMAST; + + buf[0] = CMD_DMAST; + + if (cond == SINGLE) + buf[0] |= (0 << 1) | (1 << 0); + else if (cond == BURST) + buf[0] |= (1 << 1) | (1 << 0); + + PL330_DBGCMD_DUMP(SZ_DMAST, "\tDMAST%c\n", + cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'A')); + + return SZ_DMAST; +} + +static inline u32 _emit_STP(unsigned dry_run, u8 buf[], + enum pl330_cond cond, u8 peri) +{ + if (dry_run) + return SZ_DMASTP; + + buf[0] = CMD_DMASTP; + + if (cond == BURST) + buf[0] |= (1 << 1); + + peri &= 0x1f; + peri <<= 3; + buf[1] = peri; + + PL330_DBGCMD_DUMP(SZ_DMASTP, "\tDMASTP%c %u\n", + cond == SINGLE ? 'S' : 'B', peri >> 3); + + return SZ_DMASTP; +} + +static inline u32 _emit_STZ(unsigned dry_run, u8 buf[]) +{ + if (dry_run) + return SZ_DMASTZ; + + buf[0] = CMD_DMASTZ; + + PL330_DBGCMD_DUMP(SZ_DMASTZ, "\tDMASTZ\n"); + + return SZ_DMASTZ; +} + +static inline u32 _emit_WFE(unsigned dry_run, u8 buf[], u8 ev, + unsigned invalidate) +{ + if (dry_run) + return SZ_DMAWFE; + + buf[0] = CMD_DMAWFE; + + ev &= 0x1f; + ev <<= 3; + buf[1] = ev; + + if (invalidate) + buf[1] |= (1 << 1); + + PL330_DBGCMD_DUMP(SZ_DMAWFE, "\tDMAWFE %u%s\n", + ev >> 3, invalidate ? ", I" : ""); + + return SZ_DMAWFE; +} + +static inline u32 _emit_WFP(unsigned dry_run, u8 buf[], + enum pl330_cond cond, u8 peri) +{ + if (dry_run) + return SZ_DMAWFP; + + buf[0] = CMD_DMAWFP; + + if (cond == SINGLE) + buf[0] |= (0 << 1) | (0 << 0); + else if (cond == BURST) + buf[0] |= (1 << 1) | (0 << 0); + else + buf[0] |= (0 << 1) | (1 << 0); + + peri &= 0x1f; + peri <<= 3; + buf[1] = peri; + + PL330_DBGCMD_DUMP(SZ_DMAWFP, "\tDMAWFP%c %u\n", + cond == SINGLE ? 'S' : (cond == BURST ? 'B' : 'P'), peri >> 3); + + return SZ_DMAWFP; +} + +static inline u32 _emit_WMB(unsigned dry_run, u8 buf[]) +{ + if (dry_run) + return SZ_DMAWMB; + + buf[0] = CMD_DMAWMB; + + PL330_DBGCMD_DUMP(SZ_DMAWMB, "\tDMAWMB\n"); + + return SZ_DMAWMB; +} + +struct _arg_GO { + u8 chan; + u32 addr; + unsigned ns; +}; + +static inline u32 _emit_GO(unsigned dry_run, u8 buf[], + const struct _arg_GO *arg) +{ + u8 chan = arg->chan; + u32 addr = arg->addr; + unsigned ns = arg->ns; + + if (dry_run) + return SZ_DMAGO; + + buf[0] = CMD_DMAGO; + buf[0] |= (ns << 1); + + buf[1] = chan & 0x7; + + *((__le32 *)&buf[2]) = cpu_to_le32(addr); + + return SZ_DMAGO; +} + +#define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) + +/* Returns Time-Out */ +static bool _until_dmac_idle(struct pl330_thread *thrd) +{ + void __iomem *regs = thrd->dmac->base; + unsigned long loops = msecs_to_loops(5); + + do { + /* Until Manager is Idle */ + if (!(readl(regs + DBGSTATUS) & DBG_BUSY)) + break; + + cpu_relax(); + } while (--loops); + + if (!loops) + return true; + + return false; +} + +static inline void _execute_DBGINSN(struct pl330_thread *thrd, + u8 insn[], bool as_manager) +{ + void __iomem *regs = thrd->dmac->base; + u32 val; + + val = (insn[0] << 16) | (insn[1] << 24); + if (!as_manager) { + val |= (1 << 0); + val |= (thrd->id << 8); /* Channel Number */ + } + writel(val, regs + DBGINST0); + + val = le32_to_cpu(*((__le32 *)&insn[2])); + writel(val, regs + DBGINST1); + + /* If timed out due to halted state-machine */ + if (_until_dmac_idle(thrd)) { + dev_err(thrd->dmac->ddma.dev, "DMAC halted!\n"); + return; + } + + /* Get going */ + writel(0, regs + DBGCMD); +} + +static inline u32 _state(struct pl330_thread *thrd) +{ + void __iomem *regs = thrd->dmac->base; + u32 val; + + if (is_manager(thrd)) + val = readl(regs + DS) & 0xf; + else + val = readl(regs + CS(thrd->id)) & 0xf; + + switch (val) { + case DS_ST_STOP: + return PL330_STATE_STOPPED; + case DS_ST_EXEC: + return PL330_STATE_EXECUTING; + case DS_ST_CMISS: + return PL330_STATE_CACHEMISS; + case DS_ST_UPDTPC: + return PL330_STATE_UPDTPC; + case DS_ST_WFE: + return PL330_STATE_WFE; + case DS_ST_FAULT: + return PL330_STATE_FAULTING; + case DS_ST_ATBRR: + if (is_manager(thrd)) + return PL330_STATE_INVALID; + else + return PL330_STATE_ATBARRIER; + case DS_ST_QBUSY: + if (is_manager(thrd)) + return PL330_STATE_INVALID; + else + return PL330_STATE_QUEUEBUSY; + case DS_ST_WFP: + if (is_manager(thrd)) + return PL330_STATE_INVALID; + else + return PL330_STATE_WFP; + case DS_ST_KILL: + if (is_manager(thrd)) + return PL330_STATE_INVALID; + else + return PL330_STATE_KILLING; + case DS_ST_CMPLT: + if (is_manager(thrd)) + return PL330_STATE_INVALID; + else + return PL330_STATE_COMPLETING; + case DS_ST_FLTCMP: + if (is_manager(thrd)) + return PL330_STATE_INVALID; + else + return PL330_STATE_FAULT_COMPLETING; + default: + return PL330_STATE_INVALID; + } +} + +static void _stop(struct pl330_thread *thrd) +{ + void __iomem *regs = thrd->dmac->base; + u8 insn[6] = {0, 0, 0, 0, 0, 0}; + + if (_state(thrd) == PL330_STATE_FAULT_COMPLETING) + UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING); + + /* Return if nothing needs to be done */ + if (_state(thrd) == PL330_STATE_COMPLETING + || _state(thrd) == PL330_STATE_KILLING + || _state(thrd) == PL330_STATE_STOPPED) + return; + + _emit_KILL(0, insn); + + /* Stop generating interrupts for SEV */ + writel(readl(regs + INTEN) & ~(1 << thrd->ev), regs + INTEN); + + _execute_DBGINSN(thrd, insn, is_manager(thrd)); +} + +/* Start doing req 'idx' of thread 'thrd' */ +static bool _trigger(struct pl330_thread *thrd) +{ + void __iomem *regs = thrd->dmac->base; + struct _pl330_req *req; + struct dma_pl330_desc *desc; + struct _arg_GO go; + unsigned ns; + u8 insn[6] = {0, 0, 0, 0, 0, 0}; + int idx; + + /* Return if already ACTIVE */ + if (_state(thrd) != PL330_STATE_STOPPED) + return true; + + idx = 1 - thrd->lstenq; + if (thrd->req[idx].desc != NULL) { + req = &thrd->req[idx]; + } else { + idx = thrd->lstenq; + if (thrd->req[idx].desc != NULL) + req = &thrd->req[idx]; + else + req = NULL; + } + + /* Return if no request */ + if (!req) + return true; + + /* Return if req is running */ + if (idx == thrd->req_running) + return true; + + desc = req->desc; + + ns = desc->rqcfg.nonsecure ? 1 : 0; + + /* See 'Abort Sources' point-4 at Page 2-25 */ + if (_manager_ns(thrd) && !ns) + dev_info(thrd->dmac->ddma.dev, "%s:%d Recipe for ABORT!\n", + __func__, __LINE__); + + go.chan = thrd->id; + go.addr = req->mc_bus; + go.ns = ns; + _emit_GO(0, insn, &go); + + /* Set to generate interrupts for SEV */ + writel(readl(regs + INTEN) | (1 << thrd->ev), regs + INTEN); + + /* Only manager can execute GO */ + _execute_DBGINSN(thrd, insn, true); + + thrd->req_running = idx; + + return true; +} + +static bool _start(struct pl330_thread *thrd) +{ + switch (_state(thrd)) { + case PL330_STATE_FAULT_COMPLETING: + UNTIL(thrd, PL330_STATE_FAULTING | PL330_STATE_KILLING); + + if (_state(thrd) == PL330_STATE_KILLING) + UNTIL(thrd, PL330_STATE_STOPPED) + + case PL330_STATE_FAULTING: + _stop(thrd); + + case PL330_STATE_KILLING: + case PL330_STATE_COMPLETING: + UNTIL(thrd, PL330_STATE_STOPPED) + + case PL330_STATE_STOPPED: + return _trigger(thrd); + + case PL330_STATE_WFP: + case PL330_STATE_QUEUEBUSY: + case PL330_STATE_ATBARRIER: + case PL330_STATE_UPDTPC: + case PL330_STATE_CACHEMISS: + case PL330_STATE_EXECUTING: + return true; + + case PL330_STATE_WFE: /* For RESUME, nothing yet */ + default: + return false; + } +} + +static inline int _ldst_memtomem(unsigned dry_run, u8 buf[], + const struct _xfer_spec *pxs, int cyc) +{ + int off = 0; + struct pl330_config *pcfg = pxs->desc->rqcfg.pcfg; + + /* check lock-up free version */ + if (get_revision(pcfg->periph_id) >= PERIPH_REV_R1P0) { + while (cyc--) { + off += _emit_LD(dry_run, &buf[off], ALWAYS); + off += _emit_ST(dry_run, &buf[off], ALWAYS); + } + } else { + while (cyc--) { + off += _emit_LD(dry_run, &buf[off], ALWAYS); + off += _emit_RMB(dry_run, &buf[off]); + off += _emit_ST(dry_run, &buf[off], ALWAYS); + off += _emit_WMB(dry_run, &buf[off]); + } + } + + return off; +} + +static inline int _ldst_devtomem(unsigned dry_run, u8 buf[], + const struct _xfer_spec *pxs, int cyc) +{ + int off = 0; + + while (cyc--) { + off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->desc->peri); + off += _emit_LDP(dry_run, &buf[off], SINGLE, pxs->desc->peri); + off += _emit_ST(dry_run, &buf[off], ALWAYS); + off += _emit_FLUSHP(dry_run, &buf[off], pxs->desc->peri); + } + + return off; +} + +static inline int _ldst_memtodev(unsigned dry_run, u8 buf[], + const struct _xfer_spec *pxs, int cyc) +{ + int off = 0; + + while (cyc--) { + off += _emit_WFP(dry_run, &buf[off], SINGLE, pxs->desc->peri); + off += _emit_LD(dry_run, &buf[off], ALWAYS); + off += _emit_STP(dry_run, &buf[off], SINGLE, pxs->desc->peri); + off += _emit_FLUSHP(dry_run, &buf[off], pxs->desc->peri); + } + + return off; +} + +static int _bursts(unsigned dry_run, u8 buf[], + const struct _xfer_spec *pxs, int cyc) +{ + int off = 0; + + switch (pxs->desc->rqtype) { + case DMA_MEM_TO_DEV: + off += _ldst_memtodev(dry_run, &buf[off], pxs, cyc); + break; + case DMA_DEV_TO_MEM: + off += _ldst_devtomem(dry_run, &buf[off], pxs, cyc); + break; + case DMA_MEM_TO_MEM: + off += _ldst_memtomem(dry_run, &buf[off], pxs, cyc); + break; + default: + off += 0x40000000; /* Scare off the Client */ + break; + } + + return off; +} + +/* Returns bytes consumed and updates bursts */ +static inline int _loop(unsigned dry_run, u8 buf[], + unsigned long *bursts, const struct _xfer_spec *pxs) +{ + int cyc, cycmax, szlp, szlpend, szbrst, off; + unsigned lcnt0, lcnt1, ljmp0, ljmp1; + struct _arg_LPEND lpend; + + /* Max iterations possible in DMALP is 256 */ + if (*bursts >= 256*256) { + lcnt1 = 256; + lcnt0 = 256; + cyc = *bursts / lcnt1 / lcnt0; + } else if (*bursts > 256) { + lcnt1 = 256; + lcnt0 = *bursts / lcnt1; + cyc = 1; + } else { + lcnt1 = *bursts; + lcnt0 = 0; + cyc = 1; + } + + szlp = _emit_LP(1, buf, 0, 0); + szbrst = _bursts(1, buf, pxs, 1); + + lpend.cond = ALWAYS; + lpend.forever = false; + lpend.loop = 0; + lpend.bjump = 0; + szlpend = _emit_LPEND(1, buf, &lpend); + + if (lcnt0) { + szlp *= 2; + szlpend *= 2; + } + + /* + * Max bursts that we can unroll due to limit on the + * size of backward jump that can be encoded in DMALPEND + * which is 8-bits and hence 255 + */ + cycmax = (255 - (szlp + szlpend)) / szbrst; + + cyc = (cycmax < cyc) ? cycmax : cyc; + + off = 0; + + if (lcnt0) { + off += _emit_LP(dry_run, &buf[off], 0, lcnt0); + ljmp0 = off; + } + + off += _emit_LP(dry_run, &buf[off], 1, lcnt1); + ljmp1 = off; + + off += _bursts(dry_run, &buf[off], pxs, cyc); + + lpend.cond = ALWAYS; + lpend.forever = false; + lpend.loop = 1; + lpend.bjump = off - ljmp1; + off += _emit_LPEND(dry_run, &buf[off], &lpend); + + if (lcnt0) { + lpend.cond = ALWAYS; + lpend.forever = false; + lpend.loop = 0; + lpend.bjump = off - ljmp0; + off += _emit_LPEND(dry_run, &buf[off], &lpend); + } + + *bursts = lcnt1 * cyc; + if (lcnt0) + *bursts *= lcnt0; + + return off; +} + +static inline int _setup_loops(unsigned dry_run, u8 buf[], + const struct _xfer_spec *pxs) +{ + struct pl330_xfer *x = &pxs->desc->px; + u32 ccr = pxs->ccr; + unsigned long c, bursts = BYTE_TO_BURST(x->bytes, ccr); + int off = 0; + + while (bursts) { + c = bursts; + off += _loop(dry_run, &buf[off], &c, pxs); + bursts -= c; + } + + return off; +} + +static inline int _setup_xfer(unsigned dry_run, u8 buf[], + const struct _xfer_spec *pxs) +{ + struct pl330_xfer *x = &pxs->desc->px; + int off = 0; + + /* DMAMOV SAR, x->src_addr */ + off += _emit_MOV(dry_run, &buf[off], SAR, x->src_addr); + /* DMAMOV DAR, x->dst_addr */ + off += _emit_MOV(dry_run, &buf[off], DAR, x->dst_addr); + + /* Setup Loop(s) */ + off += _setup_loops(dry_run, &buf[off], pxs); + + return off; +} + +/* + * A req is a sequence of one or more xfer units. + * Returns the number of bytes taken to setup the MC for the req. + */ +static int _setup_req(unsigned dry_run, struct pl330_thread *thrd, + unsigned index, struct _xfer_spec *pxs) +{ + struct _pl330_req *req = &thrd->req[index]; + struct pl330_xfer *x; + u8 *buf = req->mc_cpu; + int off = 0; + + PL330_DBGMC_START(req->mc_bus); + + /* DMAMOV CCR, ccr */ + off += _emit_MOV(dry_run, &buf[off], CCR, pxs->ccr); + + x = &pxs->desc->px; + /* Error if xfer length is not aligned at burst size */ + if (x->bytes % (BRST_SIZE(pxs->ccr) * BRST_LEN(pxs->ccr))) + return -EINVAL; + + off += _setup_xfer(dry_run, &buf[off], pxs); + + /* DMASEV peripheral/event */ + off += _emit_SEV(dry_run, &buf[off], thrd->ev); + /* DMAEND */ + off += _emit_END(dry_run, &buf[off]); + + return off; +} + +static inline u32 _prepare_ccr(const struct pl330_reqcfg *rqc) +{ + u32 ccr = 0; + + if (rqc->src_inc) + ccr |= CC_SRCINC; + + if (rqc->dst_inc) + ccr |= CC_DSTINC; + + /* We set same protection levels for Src and DST for now */ + if (rqc->privileged) + ccr |= CC_SRCPRI | CC_DSTPRI; + if (rqc->nonsecure) + ccr |= CC_SRCNS | CC_DSTNS; + if (rqc->insnaccess) + ccr |= CC_SRCIA | CC_DSTIA; + + ccr |= (((rqc->brst_len - 1) & 0xf) << CC_SRCBRSTLEN_SHFT); + ccr |= (((rqc->brst_len - 1) & 0xf) << CC_DSTBRSTLEN_SHFT); + + ccr |= (rqc->brst_size << CC_SRCBRSTSIZE_SHFT); + ccr |= (rqc->brst_size << CC_DSTBRSTSIZE_SHFT); + + ccr |= (rqc->scctl << CC_SRCCCTRL_SHFT); + ccr |= (rqc->dcctl << CC_DSTCCTRL_SHFT); + + ccr |= (rqc->swap << CC_SWAP_SHFT); + + return ccr; +} + +/* + * Submit a list of xfers after which the client wants notification. + * Client is not notified after each xfer unit, just once after all + * xfer units are done or some error occurs. + */ +static int pl330_submit_req(struct pl330_thread *thrd, + struct dma_pl330_desc *desc) +{ + struct pl330_dmac *pl330 = thrd->dmac; + struct _xfer_spec xs; + unsigned long flags; + unsigned idx; + u32 ccr; + int ret = 0; + + if (pl330->state == DYING + || pl330->dmac_tbd.reset_chan & (1 << thrd->id)) { + dev_info(thrd->dmac->ddma.dev, "%s:%d\n", + __func__, __LINE__); + return -EAGAIN; + } + + /* If request for non-existing peripheral */ + if (desc->rqtype != DMA_MEM_TO_MEM && + desc->peri >= pl330->pcfg.num_peri) { + dev_info(thrd->dmac->ddma.dev, + "%s:%d Invalid peripheral(%u)!\n", + __func__, __LINE__, desc->peri); + return -EINVAL; + } + + spin_lock_irqsave(&pl330->lock, flags); + + if (_queue_full(thrd)) { + ret = -EAGAIN; + goto xfer_exit; + } + + /* Prefer Secure Channel */ + if (!_manager_ns(thrd)) + desc->rqcfg.nonsecure = 0; + else + desc->rqcfg.nonsecure = 1; + + ccr = _prepare_ccr(&desc->rqcfg); + + idx = thrd->req[0].desc == NULL ? 0 : 1; + + xs.ccr = ccr; + xs.desc = desc; + + /* First dry run to check if req is acceptable */ + ret = _setup_req(1, thrd, idx, &xs); + if (ret < 0) + goto xfer_exit; + + if (ret > pl330->mcbufsz / 2) { + dev_info(pl330->ddma.dev, "%s:%d Trying increasing mcbufsz\n", + __func__, __LINE__); + ret = -ENOMEM; + goto xfer_exit; + } + + /* Hook the request */ + thrd->lstenq = idx; + thrd->req[idx].desc = desc; + _setup_req(0, thrd, idx, &xs); + + ret = 0; + +xfer_exit: + spin_unlock_irqrestore(&pl330->lock, flags); + + return ret; +} + +static void dma_pl330_rqcb(struct dma_pl330_desc *desc, enum pl330_op_err err) +{ + struct dma_pl330_chan *pch; + unsigned long flags; + + if (!desc) + return; + + pch = desc->pchan; + + /* If desc aborted */ + if (!pch) + return; + + spin_lock_irqsave(&pch->lock, flags); + + desc->status = DONE; + + spin_unlock_irqrestore(&pch->lock, flags); + + tasklet_schedule(&pch->task); +} + +static void pl330_dotask(unsigned long data) +{ + struct pl330_dmac *pl330 = (struct pl330_dmac *) data; + unsigned long flags; + int i; + + spin_lock_irqsave(&pl330->lock, flags); + + /* The DMAC itself gone nuts */ + if (pl330->dmac_tbd.reset_dmac) { + pl330->state = DYING; + /* Reset the manager too */ + pl330->dmac_tbd.reset_mngr = true; + /* Clear the reset flag */ + pl330->dmac_tbd.reset_dmac = false; + } + + if (pl330->dmac_tbd.reset_mngr) { + _stop(pl330->manager); + /* Reset all channels */ + pl330->dmac_tbd.reset_chan = (1 << pl330->pcfg.num_chan) - 1; + /* Clear the reset flag */ + pl330->dmac_tbd.reset_mngr = false; + } + + for (i = 0; i < pl330->pcfg.num_chan; i++) { + + if (pl330->dmac_tbd.reset_chan & (1 << i)) { + struct pl330_thread *thrd = &pl330->channels[i]; + void __iomem *regs = pl330->base; + enum pl330_op_err err; + + _stop(thrd); + + if (readl(regs + FSC) & (1 << thrd->id)) + err = PL330_ERR_FAIL; + else + err = PL330_ERR_ABORT; + + spin_unlock_irqrestore(&pl330->lock, flags); + dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, err); + dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, err); + spin_lock_irqsave(&pl330->lock, flags); + + thrd->req[0].desc = NULL; + thrd->req[1].desc = NULL; + thrd->req_running = -1; + + /* Clear the reset flag */ + pl330->dmac_tbd.reset_chan &= ~(1 << i); + } + } + + spin_unlock_irqrestore(&pl330->lock, flags); + + return; +} + +/* Returns 1 if state was updated, 0 otherwise */ +static int pl330_update(struct pl330_dmac *pl330) +{ + struct dma_pl330_desc *descdone, *tmp; + unsigned long flags; + void __iomem *regs; + u32 val; + int id, ev, ret = 0; + + regs = pl330->base; + + spin_lock_irqsave(&pl330->lock, flags); + + val = readl(regs + FSM) & 0x1; + if (val) + pl330->dmac_tbd.reset_mngr = true; + else + pl330->dmac_tbd.reset_mngr = false; + + val = readl(regs + FSC) & ((1 << pl330->pcfg.num_chan) - 1); + pl330->dmac_tbd.reset_chan |= val; + if (val) { + int i = 0; + while (i < pl330->pcfg.num_chan) { + if (val & (1 << i)) { + dev_info(pl330->ddma.dev, + "Reset Channel-%d\t CS-%x FTC-%x\n", + i, readl(regs + CS(i)), + readl(regs + FTC(i))); + _stop(&pl330->channels[i]); + } + i++; + } + } + + /* Check which event happened i.e, thread notified */ + val = readl(regs + ES); + if (pl330->pcfg.num_events < 32 + && val & ~((1 << pl330->pcfg.num_events) - 1)) { + pl330->dmac_tbd.reset_dmac = true; + dev_err(pl330->ddma.dev, "%s:%d Unexpected!\n", __func__, + __LINE__); + ret = 1; + goto updt_exit; + } + + for (ev = 0; ev < pl330->pcfg.num_events; ev++) { + if (val & (1 << ev)) { /* Event occurred */ + struct pl330_thread *thrd; + u32 inten = readl(regs + INTEN); + int active; + + /* Clear the event */ + if (inten & (1 << ev)) + writel(1 << ev, regs + INTCLR); + + ret = 1; + + id = pl330->events[ev]; + + thrd = &pl330->channels[id]; + + active = thrd->req_running; + if (active == -1) /* Aborted */ + continue; + + /* Detach the req */ + descdone = thrd->req[active].desc; + thrd->req[active].desc = NULL; + + thrd->req_running = -1; + + /* Get going again ASAP */ + _start(thrd); + + /* For now, just make a list of callbacks to be done */ + list_add_tail(&descdone->rqd, &pl330->req_done); + } + } + + /* Now that we are in no hurry, do the callbacks */ + list_for_each_entry_safe(descdone, tmp, &pl330->req_done, rqd) { + list_del(&descdone->rqd); + spin_unlock_irqrestore(&pl330->lock, flags); + dma_pl330_rqcb(descdone, PL330_ERR_NONE); + spin_lock_irqsave(&pl330->lock, flags); + } + +updt_exit: + spin_unlock_irqrestore(&pl330->lock, flags); + + if (pl330->dmac_tbd.reset_dmac + || pl330->dmac_tbd.reset_mngr + || pl330->dmac_tbd.reset_chan) { + ret = 1; + tasklet_schedule(&pl330->tasks); + } + + return ret; +} + +/* Reserve an event */ +static inline int _alloc_event(struct pl330_thread *thrd) +{ + struct pl330_dmac *pl330 = thrd->dmac; + int ev; + + for (ev = 0; ev < pl330->pcfg.num_events; ev++) + if (pl330->events[ev] == -1) { + pl330->events[ev] = thrd->id; + return ev; + } + + return -1; +} + +static bool _chan_ns(const struct pl330_dmac *pl330, int i) +{ + return pl330->pcfg.irq_ns & (1 << i); +} + +/* Upon success, returns IdentityToken for the + * allocated channel, NULL otherwise. + */ +static struct pl330_thread *pl330_request_channel(struct pl330_dmac *pl330) +{ + struct pl330_thread *thrd = NULL; + unsigned long flags; + int chans, i; + + if (pl330->state == DYING) + return NULL; + + chans = pl330->pcfg.num_chan; + + spin_lock_irqsave(&pl330->lock, flags); + + for (i = 0; i < chans; i++) { + thrd = &pl330->channels[i]; + if ((thrd->free) && (!_manager_ns(thrd) || + _chan_ns(pl330, i))) { + thrd->ev = _alloc_event(thrd); + if (thrd->ev >= 0) { + thrd->free = false; + thrd->lstenq = 1; + thrd->req[0].desc = NULL; + thrd->req[1].desc = NULL; + thrd->req_running = -1; + break; + } + } + thrd = NULL; + } + + spin_unlock_irqrestore(&pl330->lock, flags); + + return thrd; +} + +/* Release an event */ +static inline void _free_event(struct pl330_thread *thrd, int ev) +{ + struct pl330_dmac *pl330 = thrd->dmac; + + /* If the event is valid and was held by the thread */ + if (ev >= 0 && ev < pl330->pcfg.num_events + && pl330->events[ev] == thrd->id) + pl330->events[ev] = -1; +} + +static void pl330_release_channel(struct pl330_thread *thrd) +{ + struct pl330_dmac *pl330; + unsigned long flags; + + if (!thrd || thrd->free) + return; + + _stop(thrd); + + dma_pl330_rqcb(thrd->req[1 - thrd->lstenq].desc, PL330_ERR_ABORT); + dma_pl330_rqcb(thrd->req[thrd->lstenq].desc, PL330_ERR_ABORT); + + pl330 = thrd->dmac; + + spin_lock_irqsave(&pl330->lock, flags); + _free_event(thrd, thrd->ev); + thrd->free = true; + spin_unlock_irqrestore(&pl330->lock, flags); +} + +/* Initialize the structure for PL330 configuration, that can be used + * by the client driver the make best use of the DMAC + */ +static void read_dmac_config(struct pl330_dmac *pl330) +{ + void __iomem *regs = pl330->base; + u32 val; + + val = readl(regs + CRD) >> CRD_DATA_WIDTH_SHIFT; + val &= CRD_DATA_WIDTH_MASK; + pl330->pcfg.data_bus_width = 8 * (1 << val); + + val = readl(regs + CRD) >> CRD_DATA_BUFF_SHIFT; + val &= CRD_DATA_BUFF_MASK; + pl330->pcfg.data_buf_dep = val + 1; + + val = readl(regs + CR0) >> CR0_NUM_CHANS_SHIFT; + val &= CR0_NUM_CHANS_MASK; + val += 1; + pl330->pcfg.num_chan = val; + + val = readl(regs + CR0); + if (val & CR0_PERIPH_REQ_SET) { + val = (val >> CR0_NUM_PERIPH_SHIFT) & CR0_NUM_PERIPH_MASK; + val += 1; + pl330->pcfg.num_peri = val; + pl330->pcfg.peri_ns = readl(regs + CR4); + } else { + pl330->pcfg.num_peri = 0; + } + + val = readl(regs + CR0); + if (val & CR0_BOOT_MAN_NS) + pl330->pcfg.mode |= DMAC_MODE_NS; + else + pl330->pcfg.mode &= ~DMAC_MODE_NS; + + val = readl(regs + CR0) >> CR0_NUM_EVENTS_SHIFT; + val &= CR0_NUM_EVENTS_MASK; + val += 1; + pl330->pcfg.num_events = val; + + pl330->pcfg.irq_ns = readl(regs + CR3); +} + +static inline void _reset_thread(struct pl330_thread *thrd) +{ + struct pl330_dmac *pl330 = thrd->dmac; + + thrd->req[0].mc_cpu = pl330->mcode_cpu + + (thrd->id * pl330->mcbufsz); + thrd->req[0].mc_bus = pl330->mcode_bus + + (thrd->id * pl330->mcbufsz); + thrd->req[0].desc = NULL; + + thrd->req[1].mc_cpu = thrd->req[0].mc_cpu + + pl330->mcbufsz / 2; + thrd->req[1].mc_bus = thrd->req[0].mc_bus + + pl330->mcbufsz / 2; + thrd->req[1].desc = NULL; + + thrd->req_running = -1; +} + +static int dmac_alloc_threads(struct pl330_dmac *pl330) +{ + int chans = pl330->pcfg.num_chan; + struct pl330_thread *thrd; + int i; + + /* Allocate 1 Manager and 'chans' Channel threads */ + pl330->channels = kzalloc((1 + chans) * sizeof(*thrd), + GFP_KERNEL); + if (!pl330->channels) + return -ENOMEM; + + /* Init Channel threads */ + for (i = 0; i < chans; i++) { + thrd = &pl330->channels[i]; + thrd->id = i; + thrd->dmac = pl330; + _reset_thread(thrd); + thrd->free = true; + } + + /* MANAGER is indexed at the end */ + thrd = &pl330->channels[chans]; + thrd->id = chans; + thrd->dmac = pl330; + thrd->free = false; + pl330->manager = thrd; + + return 0; +} + +static int dmac_alloc_resources(struct pl330_dmac *pl330) +{ + int chans = pl330->pcfg.num_chan; + int ret; + + /* + * Alloc MicroCode buffer for 'chans' Channel threads. + * A channel's buffer offset is (Channel_Id * MCODE_BUFF_PERCHAN) + */ + pl330->mcode_cpu = dma_alloc_coherent(pl330->ddma.dev, + chans * pl330->mcbufsz, + &pl330->mcode_bus, GFP_KERNEL); + if (!pl330->mcode_cpu) { + dev_err(pl330->ddma.dev, "%s:%d Can't allocate memory!\n", + __func__, __LINE__); + return -ENOMEM; + } + + ret = dmac_alloc_threads(pl330); + if (ret) { + dev_err(pl330->ddma.dev, "%s:%d Can't to create channels for DMAC!\n", + __func__, __LINE__); + dma_free_coherent(pl330->ddma.dev, + chans * pl330->mcbufsz, + pl330->mcode_cpu, pl330->mcode_bus); + return ret; + } + + return 0; +} + +static int pl330_add(struct pl330_dmac *pl330) +{ + void __iomem *regs; + int i, ret; + + regs = pl330->base; + + /* Check if we can handle this DMAC */ + if ((pl330->pcfg.periph_id & 0xfffff) != PERIPH_ID_VAL) { + dev_err(pl330->ddma.dev, "PERIPH_ID 0x%x !\n", + pl330->pcfg.periph_id); + return -EINVAL; + } + + /* Read the configuration of the DMAC */ + read_dmac_config(pl330); + + if (pl330->pcfg.num_events == 0) { + dev_err(pl330->ddma.dev, "%s:%d Can't work without events!\n", + __func__, __LINE__); + return -EINVAL; + } + + spin_lock_init(&pl330->lock); + + INIT_LIST_HEAD(&pl330->req_done); + + /* Use default MC buffer size if not provided */ + if (!pl330->mcbufsz) + pl330->mcbufsz = MCODE_BUFF_PER_REQ * 2; + + /* Mark all events as free */ + for (i = 0; i < pl330->pcfg.num_events; i++) + pl330->events[i] = -1; + + /* Allocate resources needed by the DMAC */ + ret = dmac_alloc_resources(pl330); + if (ret) { + dev_err(pl330->ddma.dev, "Unable to create channels for DMAC\n"); + return ret; + } + + tasklet_init(&pl330->tasks, pl330_dotask, (unsigned long) pl330); + + pl330->state = INIT; + + return 0; +} + +static int dmac_free_threads(struct pl330_dmac *pl330) +{ + struct pl330_thread *thrd; + int i; + + /* Release Channel threads */ + for (i = 0; i < pl330->pcfg.num_chan; i++) { + thrd = &pl330->channels[i]; + pl330_release_channel(thrd); + } + + /* Free memory */ + kfree(pl330->channels); + + return 0; +} + +static void pl330_del(struct pl330_dmac *pl330) +{ + pl330->state = UNINIT; + + tasklet_kill(&pl330->tasks); + + /* Free DMAC resources */ + dmac_free_threads(pl330); + + dma_free_coherent(pl330->ddma.dev, + pl330->pcfg.num_chan * pl330->mcbufsz, pl330->mcode_cpu, + pl330->mcode_bus); +} + +/* forward declaration */ +static struct amba_driver pl330_driver; + +static inline struct dma_pl330_chan * +to_pchan(struct dma_chan *ch) +{ + if (!ch) + return NULL; + + return container_of(ch, struct dma_pl330_chan, chan); +} + +static inline struct dma_pl330_desc * +to_desc(struct dma_async_tx_descriptor *tx) +{ + return container_of(tx, struct dma_pl330_desc, txd); +} + +static inline void fill_queue(struct dma_pl330_chan *pch) +{ + struct dma_pl330_desc *desc; + int ret; + + list_for_each_entry(desc, &pch->work_list, node) { + + /* If already submitted */ + if (desc->status == BUSY) + continue; + + ret = pl330_submit_req(pch->thread, desc); + if (!ret) { + desc->status = BUSY; + } else if (ret == -EAGAIN) { + /* QFull or DMAC Dying */ + break; + } else { + /* Unacceptable request */ + desc->status = DONE; + dev_err(pch->dmac->ddma.dev, "%s:%d Bad Desc(%d)\n", + __func__, __LINE__, desc->txd.cookie); + tasklet_schedule(&pch->task); + } + } +} + +static void pl330_tasklet(unsigned long data) +{ + struct dma_pl330_chan *pch = (struct dma_pl330_chan *)data; + struct dma_pl330_desc *desc, *_dt; + unsigned long flags; + bool power_down = false; + + spin_lock_irqsave(&pch->lock, flags); + + /* Pick up ripe tomatoes */ + list_for_each_entry_safe(desc, _dt, &pch->work_list, node) + if (desc->status == DONE) { + if (!pch->cyclic) + dma_cookie_complete(&desc->txd); + list_move_tail(&desc->node, &pch->completed_list); + } + + /* Try to submit a req imm. next to the last completed cookie */ + fill_queue(pch); + + if (list_empty(&pch->work_list)) { + spin_lock(&pch->thread->dmac->lock); + _stop(pch->thread); + spin_unlock(&pch->thread->dmac->lock); + power_down = true; + } else { + /* Make sure the PL330 Channel thread is active */ + spin_lock(&pch->thread->dmac->lock); + _start(pch->thread); + spin_unlock(&pch->thread->dmac->lock); + } + + while (!list_empty(&pch->completed_list)) { + dma_async_tx_callback callback; + void *callback_param; + + desc = list_first_entry(&pch->completed_list, + struct dma_pl330_desc, node); + + callback = desc->txd.callback; + callback_param = desc->txd.callback_param; + + if (pch->cyclic) { + desc->status = PREP; + list_move_tail(&desc->node, &pch->work_list); + if (power_down) { + spin_lock(&pch->thread->dmac->lock); + _start(pch->thread); + spin_unlock(&pch->thread->dmac->lock); + power_down = false; + } + } else { + desc->status = FREE; + list_move_tail(&desc->node, &pch->dmac->desc_pool); + } + + dma_descriptor_unmap(&desc->txd); + + if (callback) { + spin_unlock_irqrestore(&pch->lock, flags); + callback(callback_param); + spin_lock_irqsave(&pch->lock, flags); + } + } + spin_unlock_irqrestore(&pch->lock, flags); + + /* If work list empty, power down */ + if (power_down) { + pm_runtime_mark_last_busy(pch->dmac->ddma.dev); + pm_runtime_put_autosuspend(pch->dmac->ddma.dev); + } +} + +bool pl330_filter(struct dma_chan *chan, void *param) +{ + u8 *peri_id; + + if (chan->device->dev->driver != &pl330_driver.drv) + return false; + + peri_id = chan->private; + return *peri_id == (unsigned long)param; +} +EXPORT_SYMBOL(pl330_filter); + +static struct dma_chan *of_dma_pl330_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + int count = dma_spec->args_count; + struct pl330_dmac *pl330 = ofdma->of_dma_data; + unsigned int chan_id; + + if (!pl330) + return NULL; + + if (count != 1) + return NULL; + + chan_id = dma_spec->args[0]; + if (chan_id >= pl330->num_peripherals) + return NULL; + + return dma_get_slave_channel(&pl330->peripherals[chan_id].chan); +} + +static int pl330_alloc_chan_resources(struct dma_chan *chan) +{ + struct dma_pl330_chan *pch = to_pchan(chan); + struct pl330_dmac *pl330 = pch->dmac; + unsigned long flags; + + spin_lock_irqsave(&pch->lock, flags); + + dma_cookie_init(chan); + pch->cyclic = false; + + pch->thread = pl330_request_channel(pl330); + if (!pch->thread) { + spin_unlock_irqrestore(&pch->lock, flags); + return -ENOMEM; + } + + tasklet_init(&pch->task, pl330_tasklet, (unsigned long) pch); + + spin_unlock_irqrestore(&pch->lock, flags); + + return 1; +} + +static int pl330_config(struct dma_chan *chan, + struct dma_slave_config *slave_config) +{ + struct dma_pl330_chan *pch = to_pchan(chan); + + if (slave_config->direction == DMA_MEM_TO_DEV) { + if (slave_config->dst_addr) + pch->fifo_addr = slave_config->dst_addr; + if (slave_config->dst_addr_width) + pch->burst_sz = __ffs(slave_config->dst_addr_width); + if (slave_config->dst_maxburst) + pch->burst_len = slave_config->dst_maxburst; + } else if (slave_config->direction == DMA_DEV_TO_MEM) { + if (slave_config->src_addr) + pch->fifo_addr = slave_config->src_addr; + if (slave_config->src_addr_width) + pch->burst_sz = __ffs(slave_config->src_addr_width); + if (slave_config->src_maxburst) + pch->burst_len = slave_config->src_maxburst; + } + + return 0; +} + +static int pl330_terminate_all(struct dma_chan *chan) +{ + struct dma_pl330_chan *pch = to_pchan(chan); + struct dma_pl330_desc *desc; + unsigned long flags; + struct pl330_dmac *pl330 = pch->dmac; + LIST_HEAD(list); + + pm_runtime_get_sync(pl330->ddma.dev); + spin_lock_irqsave(&pch->lock, flags); + spin_lock(&pl330->lock); + _stop(pch->thread); + spin_unlock(&pl330->lock); + + pch->thread->req[0].desc = NULL; + pch->thread->req[1].desc = NULL; + pch->thread->req_running = -1; + + /* Mark all desc done */ + list_for_each_entry(desc, &pch->submitted_list, node) { + desc->status = FREE; + dma_cookie_complete(&desc->txd); + } + + list_for_each_entry(desc, &pch->work_list , node) { + desc->status = FREE; + dma_cookie_complete(&desc->txd); + } + + list_splice_tail_init(&pch->submitted_list, &pl330->desc_pool); + list_splice_tail_init(&pch->work_list, &pl330->desc_pool); + list_splice_tail_init(&pch->completed_list, &pl330->desc_pool); + spin_unlock_irqrestore(&pch->lock, flags); + pm_runtime_mark_last_busy(pl330->ddma.dev); + pm_runtime_put_autosuspend(pl330->ddma.dev); + + return 0; +} + +/* + * We don't support DMA_RESUME command because of hardware + * limitations, so after pausing the channel we cannot restore + * it to active state. We have to terminate channel and setup + * DMA transfer again. This pause feature was implemented to + * allow safely read residue before channel termination. + */ +static int pl330_pause(struct dma_chan *chan) +{ + struct dma_pl330_chan *pch = to_pchan(chan); + struct pl330_dmac *pl330 = pch->dmac; + unsigned long flags; + + pm_runtime_get_sync(pl330->ddma.dev); + spin_lock_irqsave(&pch->lock, flags); + + spin_lock(&pl330->lock); + _stop(pch->thread); + spin_unlock(&pl330->lock); + + spin_unlock_irqrestore(&pch->lock, flags); + pm_runtime_mark_last_busy(pl330->ddma.dev); + pm_runtime_put_autosuspend(pl330->ddma.dev); + + return 0; +} + +static void pl330_free_chan_resources(struct dma_chan *chan) +{ + struct dma_pl330_chan *pch = to_pchan(chan); + unsigned long flags; + + tasklet_kill(&pch->task); + + pm_runtime_get_sync(pch->dmac->ddma.dev); + spin_lock_irqsave(&pch->lock, flags); + + pl330_release_channel(pch->thread); + pch->thread = NULL; + + if (pch->cyclic) + list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool); + + spin_unlock_irqrestore(&pch->lock, flags); + pm_runtime_mark_last_busy(pch->dmac->ddma.dev); + pm_runtime_put_autosuspend(pch->dmac->ddma.dev); +} + +static int pl330_get_current_xferred_count(struct dma_pl330_chan *pch, + struct dma_pl330_desc *desc) +{ + struct pl330_thread *thrd = pch->thread; + struct pl330_dmac *pl330 = pch->dmac; + void __iomem *regs = thrd->dmac->base; + u32 val, addr; + + pm_runtime_get_sync(pl330->ddma.dev); + val = addr = 0; + if (desc->rqcfg.src_inc) { + val = readl(regs + SA(thrd->id)); + addr = desc->px.src_addr; + } else { + val = readl(regs + DA(thrd->id)); + addr = desc->px.dst_addr; + } + pm_runtime_mark_last_busy(pch->dmac->ddma.dev); + pm_runtime_put_autosuspend(pl330->ddma.dev); + return val - addr; +} + +static enum dma_status +pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + enum dma_status ret; + unsigned long flags; + struct dma_pl330_desc *desc, *running = NULL; + struct dma_pl330_chan *pch = to_pchan(chan); + unsigned int transferred, residual = 0; + + ret = dma_cookie_status(chan, cookie, txstate); + + if (!txstate) + return ret; + + if (ret == DMA_COMPLETE) + goto out; + + spin_lock_irqsave(&pch->lock, flags); + + if (pch->thread->req_running != -1) + running = pch->thread->req[pch->thread->req_running].desc; + + /* Check in pending list */ + list_for_each_entry(desc, &pch->work_list, node) { + if (desc->status == DONE) + transferred = desc->bytes_requested; + else if (running && desc == running) + transferred = + pl330_get_current_xferred_count(pch, desc); + else + transferred = 0; + residual += desc->bytes_requested - transferred; + if (desc->txd.cookie == cookie) { + switch (desc->status) { + case DONE: + ret = DMA_COMPLETE; + break; + case PREP: + case BUSY: + ret = DMA_IN_PROGRESS; + break; + default: + WARN_ON(1); + } + break; + } + if (desc->last) + residual = 0; + } + spin_unlock_irqrestore(&pch->lock, flags); + +out: + dma_set_residue(txstate, residual); + + return ret; +} + +static void pl330_issue_pending(struct dma_chan *chan) +{ + struct dma_pl330_chan *pch = to_pchan(chan); + unsigned long flags; + + spin_lock_irqsave(&pch->lock, flags); + if (list_empty(&pch->work_list)) { + /* + * Warn on nothing pending. Empty submitted_list may + * break our pm_runtime usage counter as it is + * updated on work_list emptiness status. + */ + WARN_ON(list_empty(&pch->submitted_list)); + pm_runtime_get_sync(pch->dmac->ddma.dev); + } + list_splice_tail_init(&pch->submitted_list, &pch->work_list); + spin_unlock_irqrestore(&pch->lock, flags); + + pl330_tasklet((unsigned long)pch); +} + +/* + * We returned the last one of the circular list of descriptor(s) + * from prep_xxx, so the argument to submit corresponds to the last + * descriptor of the list. + */ +static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct dma_pl330_desc *desc, *last = to_desc(tx); + struct dma_pl330_chan *pch = to_pchan(tx->chan); + dma_cookie_t cookie; + unsigned long flags; + + spin_lock_irqsave(&pch->lock, flags); + + /* Assign cookies to all nodes */ + while (!list_empty(&last->node)) { + desc = list_entry(last->node.next, struct dma_pl330_desc, node); + if (pch->cyclic) { + desc->txd.callback = last->txd.callback; + desc->txd.callback_param = last->txd.callback_param; + } + last->last = false; + + dma_cookie_assign(&desc->txd); + + list_move_tail(&desc->node, &pch->submitted_list); + } + + last->last = true; + cookie = dma_cookie_assign(&last->txd); + list_add_tail(&last->node, &pch->submitted_list); + spin_unlock_irqrestore(&pch->lock, flags); + + return cookie; +} + +static inline void _init_desc(struct dma_pl330_desc *desc) +{ + desc->rqcfg.swap = SWAP_NO; + desc->rqcfg.scctl = CCTRL0; + desc->rqcfg.dcctl = CCTRL0; + desc->txd.tx_submit = pl330_tx_submit; + + INIT_LIST_HEAD(&desc->node); +} + +/* Returns the number of descriptors added to the DMAC pool */ +static int add_desc(struct pl330_dmac *pl330, gfp_t flg, int count) +{ + struct dma_pl330_desc *desc; + unsigned long flags; + int i; + + desc = kcalloc(count, sizeof(*desc), flg); + if (!desc) + return 0; + + spin_lock_irqsave(&pl330->pool_lock, flags); + + for (i = 0; i < count; i++) { + _init_desc(&desc[i]); + list_add_tail(&desc[i].node, &pl330->desc_pool); + } + + spin_unlock_irqrestore(&pl330->pool_lock, flags); + + return count; +} + +static struct dma_pl330_desc *pluck_desc(struct pl330_dmac *pl330) +{ + struct dma_pl330_desc *desc = NULL; + unsigned long flags; + + spin_lock_irqsave(&pl330->pool_lock, flags); + + if (!list_empty(&pl330->desc_pool)) { + desc = list_entry(pl330->desc_pool.next, + struct dma_pl330_desc, node); + + list_del_init(&desc->node); + + desc->status = PREP; + desc->txd.callback = NULL; + } + + spin_unlock_irqrestore(&pl330->pool_lock, flags); + + return desc; +} + +static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch) +{ + struct pl330_dmac *pl330 = pch->dmac; + u8 *peri_id = pch->chan.private; + struct dma_pl330_desc *desc; + + /* Pluck one desc from the pool of DMAC */ + desc = pluck_desc(pl330); + + /* If the DMAC pool is empty, alloc new */ + if (!desc) { + if (!add_desc(pl330, GFP_ATOMIC, 1)) + return NULL; + + /* Try again */ + desc = pluck_desc(pl330); + if (!desc) { + dev_err(pch->dmac->ddma.dev, + "%s:%d ALERT!\n", __func__, __LINE__); + return NULL; + } + } + + /* Initialize the descriptor */ + desc->pchan = pch; + desc->txd.cookie = 0; + async_tx_ack(&desc->txd); + + desc->peri = peri_id ? pch->chan.chan_id : 0; + desc->rqcfg.pcfg = &pch->dmac->pcfg; + + dma_async_tx_descriptor_init(&desc->txd, &pch->chan); + + return desc; +} + +static inline void fill_px(struct pl330_xfer *px, + dma_addr_t dst, dma_addr_t src, size_t len) +{ + px->bytes = len; + px->dst_addr = dst; + px->src_addr = src; +} + +static struct dma_pl330_desc * +__pl330_prep_dma_memcpy(struct dma_pl330_chan *pch, dma_addr_t dst, + dma_addr_t src, size_t len) +{ + struct dma_pl330_desc *desc = pl330_get_desc(pch); + + if (!desc) { + dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n", + __func__, __LINE__); + return NULL; + } + + /* + * Ideally we should lookout for reqs bigger than + * those that can be programmed with 256 bytes of + * MC buffer, but considering a req size is seldom + * going to be word-unaligned and more than 200MB, + * we take it easy. + * Also, should the limit is reached we'd rather + * have the platform increase MC buffer size than + * complicating this API driver. + */ + fill_px(&desc->px, dst, src, len); + + return desc; +} + +/* Call after fixing burst size */ +static inline int get_burst_len(struct dma_pl330_desc *desc, size_t len) +{ + struct dma_pl330_chan *pch = desc->pchan; + struct pl330_dmac *pl330 = pch->dmac; + int burst_len; + + burst_len = pl330->pcfg.data_bus_width / 8; + burst_len *= pl330->pcfg.data_buf_dep / pl330->pcfg.num_chan; + burst_len >>= desc->rqcfg.brst_size; + + /* src/dst_burst_len can't be more than 16 */ + if (burst_len > 16) + burst_len = 16; + + while (burst_len > 1) { + if (!(len % (burst_len << desc->rqcfg.brst_size))) + break; + burst_len--; + } + + return burst_len; +} + +static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t dma_addr, size_t len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct dma_pl330_desc *desc = NULL, *first = NULL; + struct dma_pl330_chan *pch = to_pchan(chan); + struct pl330_dmac *pl330 = pch->dmac; + unsigned int i; + dma_addr_t dst; + dma_addr_t src; + + if (len % period_len != 0) + return NULL; + + if (!is_slave_direction(direction)) { + dev_err(pch->dmac->ddma.dev, "%s:%d Invalid dma direction\n", + __func__, __LINE__); + return NULL; + } + + for (i = 0; i < len / period_len; i++) { + desc = pl330_get_desc(pch); + if (!desc) { + dev_err(pch->dmac->ddma.dev, "%s:%d Unable to fetch desc\n", + __func__, __LINE__); + + if (!first) + return NULL; + + spin_lock_irqsave(&pl330->pool_lock, flags); + + while (!list_empty(&first->node)) { + desc = list_entry(first->node.next, + struct dma_pl330_desc, node); + list_move_tail(&desc->node, &pl330->desc_pool); + } + + list_move_tail(&first->node, &pl330->desc_pool); + + spin_unlock_irqrestore(&pl330->pool_lock, flags); + + return NULL; + } + + switch (direction) { + case DMA_MEM_TO_DEV: + desc->rqcfg.src_inc = 1; + desc->rqcfg.dst_inc = 0; + src = dma_addr; + dst = pch->fifo_addr; + break; + case DMA_DEV_TO_MEM: + desc->rqcfg.src_inc = 0; + desc->rqcfg.dst_inc = 1; + src = pch->fifo_addr; + dst = dma_addr; + break; + default: + break; + } + + desc->rqtype = direction; + desc->rqcfg.brst_size = pch->burst_sz; + desc->rqcfg.brst_len = 1; + desc->bytes_requested = period_len; + fill_px(&desc->px, dst, src, period_len); + + if (!first) + first = desc; + else + list_add_tail(&desc->node, &first->node); + + dma_addr += period_len; + } + + if (!desc) + return NULL; + + pch->cyclic = true; + desc->txd.flags = flags; + + return &desc->txd; +} + +static struct dma_async_tx_descriptor * +pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst, + dma_addr_t src, size_t len, unsigned long flags) +{ + struct dma_pl330_desc *desc; + struct dma_pl330_chan *pch = to_pchan(chan); + struct pl330_dmac *pl330 = pch->dmac; + int burst; + + if (unlikely(!pch || !len)) + return NULL; + + desc = __pl330_prep_dma_memcpy(pch, dst, src, len); + if (!desc) + return NULL; + + desc->rqcfg.src_inc = 1; + desc->rqcfg.dst_inc = 1; + desc->rqtype = DMA_MEM_TO_MEM; + + /* Select max possible burst size */ + burst = pl330->pcfg.data_bus_width / 8; + + /* + * Make sure we use a burst size that aligns with all the memcpy + * parameters because our DMA programming algorithm doesn't cope with + * transfers which straddle an entry in the DMA device's MFIFO. + */ + while ((src | dst | len) & (burst - 1)) + burst /= 2; + + desc->rqcfg.brst_size = 0; + while (burst != (1 << desc->rqcfg.brst_size)) + desc->rqcfg.brst_size++; + + /* + * If burst size is smaller than bus width then make sure we only + * transfer one at a time to avoid a burst stradling an MFIFO entry. + */ + if (desc->rqcfg.brst_size * 8 < pl330->pcfg.data_bus_width) + desc->rqcfg.brst_len = 1; + + desc->rqcfg.brst_len = get_burst_len(desc, len); + + desc->txd.flags = flags; + + return &desc->txd; +} + +static void __pl330_giveback_desc(struct pl330_dmac *pl330, + struct dma_pl330_desc *first) +{ + unsigned long flags; + struct dma_pl330_desc *desc; + + if (!first) + return; + + spin_lock_irqsave(&pl330->pool_lock, flags); + + while (!list_empty(&first->node)) { + desc = list_entry(first->node.next, + struct dma_pl330_desc, node); + list_move_tail(&desc->node, &pl330->desc_pool); + } + + list_move_tail(&first->node, &pl330->desc_pool); + + spin_unlock_irqrestore(&pl330->pool_lock, flags); +} + +static struct dma_async_tx_descriptor * +pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flg, void *context) +{ + struct dma_pl330_desc *first, *desc = NULL; + struct dma_pl330_chan *pch = to_pchan(chan); + struct scatterlist *sg; + int i; + dma_addr_t addr; + + if (unlikely(!pch || !sgl || !sg_len)) + return NULL; + + addr = pch->fifo_addr; + + first = NULL; + + for_each_sg(sgl, sg, sg_len, i) { + + desc = pl330_get_desc(pch); + if (!desc) { + struct pl330_dmac *pl330 = pch->dmac; + + dev_err(pch->dmac->ddma.dev, + "%s:%d Unable to fetch desc\n", + __func__, __LINE__); + __pl330_giveback_desc(pl330, first); + + return NULL; + } + + if (!first) + first = desc; + else + list_add_tail(&desc->node, &first->node); + + if (direction == DMA_MEM_TO_DEV) { + desc->rqcfg.src_inc = 1; + desc->rqcfg.dst_inc = 0; + fill_px(&desc->px, + addr, sg_dma_address(sg), sg_dma_len(sg)); + } else { + desc->rqcfg.src_inc = 0; + desc->rqcfg.dst_inc = 1; + fill_px(&desc->px, + sg_dma_address(sg), addr, sg_dma_len(sg)); + } + + desc->rqcfg.brst_size = pch->burst_sz; + desc->rqcfg.brst_len = 1; + desc->rqtype = direction; + desc->bytes_requested = sg_dma_len(sg); + } + + /* Return the last desc in the chain */ + desc->txd.flags = flg; + return &desc->txd; +} + +static irqreturn_t pl330_irq_handler(int irq, void *data) +{ + if (pl330_update(data)) + return IRQ_HANDLED; + else + return IRQ_NONE; +} + +#define PL330_DMA_BUSWIDTHS \ + BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES) + +/* + * Runtime PM callbacks are provided by amba/bus.c driver. + * + * It is assumed here that IRQ safe runtime PM is chosen in probe and amba + * bus driver will only disable/enable the clock in runtime PM callbacks. + */ +static int __maybe_unused pl330_suspend(struct device *dev) +{ + struct amba_device *pcdev = to_amba_device(dev); + + pm_runtime_disable(dev); + + if (!pm_runtime_status_suspended(dev)) { + /* amba did not disable the clock */ + amba_pclk_disable(pcdev); + } + amba_pclk_unprepare(pcdev); + + return 0; +} + +static int __maybe_unused pl330_resume(struct device *dev) +{ + struct amba_device *pcdev = to_amba_device(dev); + int ret; + + ret = amba_pclk_prepare(pcdev); + if (ret) + return ret; + + if (!pm_runtime_status_suspended(dev)) + ret = amba_pclk_enable(pcdev); + + pm_runtime_enable(dev); + + return ret; +} + +static SIMPLE_DEV_PM_OPS(pl330_pm, pl330_suspend, pl330_resume); + +static int +pl330_probe(struct amba_device *adev, const struct amba_id *id) +{ + struct dma_pl330_platdata *pdat; + struct pl330_config *pcfg; + struct pl330_dmac *pl330; + struct dma_pl330_chan *pch, *_p; + struct dma_device *pd; + struct resource *res; + int i, ret, irq; + int num_chan; + + pdat = dev_get_platdata(&adev->dev); + + ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + /* Allocate a new DMAC and its Channels */ + pl330 = devm_kzalloc(&adev->dev, sizeof(*pl330), GFP_KERNEL); + if (!pl330) { + dev_err(&adev->dev, "unable to allocate mem\n"); + return -ENOMEM; + } + + pd = &pl330->ddma; + pd->dev = &adev->dev; + + pl330->mcbufsz = pdat ? pdat->mcbuf_sz : 0; + + res = &adev->res; + pl330->base = devm_ioremap_resource(&adev->dev, res); + if (IS_ERR(pl330->base)) + return PTR_ERR(pl330->base); + + amba_set_drvdata(adev, pl330); + + for (i = 0; i < AMBA_NR_IRQS; i++) { + irq = adev->irq[i]; + if (irq) { + ret = devm_request_irq(&adev->dev, irq, + pl330_irq_handler, 0, + dev_name(&adev->dev), pl330); + if (ret) + return ret; + } else { + break; + } + } + + pcfg = &pl330->pcfg; + + pcfg->periph_id = adev->periphid; + ret = pl330_add(pl330); + if (ret) + return ret; + + INIT_LIST_HEAD(&pl330->desc_pool); + spin_lock_init(&pl330->pool_lock); + + /* Create a descriptor pool of default size */ + if (!add_desc(pl330, GFP_KERNEL, NR_DEFAULT_DESC)) + dev_warn(&adev->dev, "unable to allocate desc\n"); + + INIT_LIST_HEAD(&pd->channels); + + /* Initialize channel parameters */ + if (pdat) + num_chan = max_t(int, pdat->nr_valid_peri, pcfg->num_chan); + else + num_chan = max_t(int, pcfg->num_peri, pcfg->num_chan); + + pl330->num_peripherals = num_chan; + + pl330->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL); + if (!pl330->peripherals) { + ret = -ENOMEM; + dev_err(&adev->dev, "unable to allocate pl330->peripherals\n"); + goto probe_err2; + } + + for (i = 0; i < num_chan; i++) { + pch = &pl330->peripherals[i]; + if (!adev->dev.of_node) + pch->chan.private = pdat ? &pdat->peri_id[i] : NULL; + else + pch->chan.private = adev->dev.of_node; + + INIT_LIST_HEAD(&pch->submitted_list); + INIT_LIST_HEAD(&pch->work_list); + INIT_LIST_HEAD(&pch->completed_list); + spin_lock_init(&pch->lock); + pch->thread = NULL; + pch->chan.device = pd; + pch->dmac = pl330; + + /* Add the channel to the DMAC list */ + list_add_tail(&pch->chan.device_node, &pd->channels); + } + + if (pdat) { + pd->cap_mask = pdat->cap_mask; + } else { + dma_cap_set(DMA_MEMCPY, pd->cap_mask); + if (pcfg->num_peri) { + dma_cap_set(DMA_SLAVE, pd->cap_mask); + dma_cap_set(DMA_CYCLIC, pd->cap_mask); + dma_cap_set(DMA_PRIVATE, pd->cap_mask); + } + } + + pd->device_alloc_chan_resources = pl330_alloc_chan_resources; + pd->device_free_chan_resources = pl330_free_chan_resources; + pd->device_prep_dma_memcpy = pl330_prep_dma_memcpy; + pd->device_prep_dma_cyclic = pl330_prep_dma_cyclic; + pd->device_tx_status = pl330_tx_status; + pd->device_prep_slave_sg = pl330_prep_slave_sg; + pd->device_config = pl330_config; + pd->device_pause = pl330_pause; + pd->device_terminate_all = pl330_terminate_all; + pd->device_issue_pending = pl330_issue_pending; + pd->src_addr_widths = PL330_DMA_BUSWIDTHS; + pd->dst_addr_widths = PL330_DMA_BUSWIDTHS; + pd->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + pd->residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; + + ret = dma_async_device_register(pd); + if (ret) { + dev_err(&adev->dev, "unable to register DMAC\n"); + goto probe_err3; + } + + if (adev->dev.of_node) { + ret = of_dma_controller_register(adev->dev.of_node, + of_dma_pl330_xlate, pl330); + if (ret) { + dev_err(&adev->dev, + "unable to register DMA to the generic DT DMA helpers\n"); + } + } + + adev->dev.dma_parms = &pl330->dma_parms; + + /* + * This is the limit for transfers with a buswidth of 1, larger + * buswidths will have larger limits. + */ + ret = dma_set_max_seg_size(&adev->dev, 1900800); + if (ret) + dev_err(&adev->dev, "unable to set the seg size\n"); + + + dev_info(&adev->dev, + "Loaded driver for PL330 DMAC-%x\n", adev->periphid); + dev_info(&adev->dev, + "\tDBUFF-%ux%ubytes Num_Chans-%u Num_Peri-%u Num_Events-%u\n", + pcfg->data_buf_dep, pcfg->data_bus_width / 8, pcfg->num_chan, + pcfg->num_peri, pcfg->num_events); + + pm_runtime_irq_safe(&adev->dev); + pm_runtime_use_autosuspend(&adev->dev); + pm_runtime_set_autosuspend_delay(&adev->dev, PL330_AUTOSUSPEND_DELAY); + pm_runtime_mark_last_busy(&adev->dev); + pm_runtime_put_autosuspend(&adev->dev); + + return 0; +probe_err3: + /* Idle the DMAC */ + list_for_each_entry_safe(pch, _p, &pl330->ddma.channels, + chan.device_node) { + + /* Remove the channel */ + list_del(&pch->chan.device_node); + + /* Flush the channel */ + if (pch->thread) { + pl330_terminate_all(&pch->chan); + pl330_free_chan_resources(&pch->chan); + } + } +probe_err2: + pl330_del(pl330); + + return ret; +} + +static int pl330_remove(struct amba_device *adev) +{ + struct pl330_dmac *pl330 = amba_get_drvdata(adev); + struct dma_pl330_chan *pch, *_p; + + pm_runtime_get_noresume(pl330->ddma.dev); + + if (adev->dev.of_node) + of_dma_controller_free(adev->dev.of_node); + + dma_async_device_unregister(&pl330->ddma); + + /* Idle the DMAC */ + list_for_each_entry_safe(pch, _p, &pl330->ddma.channels, + chan.device_node) { + + /* Remove the channel */ + list_del(&pch->chan.device_node); + + /* Flush the channel */ + if (pch->thread) { + pl330_terminate_all(&pch->chan); + pl330_free_chan_resources(&pch->chan); + } + } + + pl330_del(pl330); + + return 0; +} + +static struct amba_id pl330_ids[] = { + { + .id = 0x00041330, + .mask = 0x000fffff, + }, + { 0, 0 }, +}; + +MODULE_DEVICE_TABLE(amba, pl330_ids); + +static struct amba_driver pl330_driver = { + .drv = { + .owner = THIS_MODULE, + .name = "dma-pl330", + .pm = &pl330_pm, + }, + .id_table = pl330_ids, + .probe = pl330_probe, + .remove = pl330_remove, +}; + +module_amba_driver(pl330_driver); + +MODULE_AUTHOR("Jaswinder Singh <jassisinghbrar@gmail.com>"); +MODULE_DESCRIPTION("API Driver for PL330 DMAC"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/ppc4xx/Makefile b/drivers/dma/ppc4xx/Makefile new file mode 100644 index 000000000..b3d259b3e --- /dev/null +++ b/drivers/dma/ppc4xx/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_AMCC_PPC440SPE_ADMA) += adma.o diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c new file mode 100644 index 000000000..9217f893b --- /dev/null +++ b/drivers/dma/ppc4xx/adma.c @@ -0,0 +1,4649 @@ +/* + * Copyright (C) 2006-2009 DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * Further porting to arch/powerpc by + * Anatolij Gustschin <agust@denx.de> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * The full GNU General Public License is included in this distribution in the + * file called COPYING. + */ + +/* + * This driver supports the asynchrounous DMA copy and RAID engines available + * on the AMCC PPC440SPe Processors. + * Based on the Intel Xscale(R) family of I/O Processors (IOP 32x, 33x, 134x) + * ADMA driver written by D.Williams. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/async_tx.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/uaccess.h> +#include <linux/proc_fs.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <asm/dcr.h> +#include <asm/dcr-regs.h> +#include "adma.h" +#include "../dmaengine.h" + +enum ppc_adma_init_code { + PPC_ADMA_INIT_OK = 0, + PPC_ADMA_INIT_MEMRES, + PPC_ADMA_INIT_MEMREG, + PPC_ADMA_INIT_ALLOC, + PPC_ADMA_INIT_COHERENT, + PPC_ADMA_INIT_CHANNEL, + PPC_ADMA_INIT_IRQ1, + PPC_ADMA_INIT_IRQ2, + PPC_ADMA_INIT_REGISTER +}; + +static char *ppc_adma_errors[] = { + [PPC_ADMA_INIT_OK] = "ok", + [PPC_ADMA_INIT_MEMRES] = "failed to get memory resource", + [PPC_ADMA_INIT_MEMREG] = "failed to request memory region", + [PPC_ADMA_INIT_ALLOC] = "failed to allocate memory for adev " + "structure", + [PPC_ADMA_INIT_COHERENT] = "failed to allocate coherent memory for " + "hardware descriptors", + [PPC_ADMA_INIT_CHANNEL] = "failed to allocate memory for channel", + [PPC_ADMA_INIT_IRQ1] = "failed to request first irq", + [PPC_ADMA_INIT_IRQ2] = "failed to request second irq", + [PPC_ADMA_INIT_REGISTER] = "failed to register dma async device", +}; + +static enum ppc_adma_init_code +ppc440spe_adma_devices[PPC440SPE_ADMA_ENGINES_NUM]; + +struct ppc_dma_chan_ref { + struct dma_chan *chan; + struct list_head node; +}; + +/* The list of channels exported by ppc440spe ADMA */ +struct list_head +ppc440spe_adma_chan_list = LIST_HEAD_INIT(ppc440spe_adma_chan_list); + +/* This flag is set when want to refetch the xor chain in the interrupt + * handler + */ +static u32 do_xor_refetch; + +/* Pointer to DMA0, DMA1 CP/CS FIFO */ +static void *ppc440spe_dma_fifo_buf; + +/* Pointers to last submitted to DMA0, DMA1 CDBs */ +static struct ppc440spe_adma_desc_slot *chan_last_sub[3]; +static struct ppc440spe_adma_desc_slot *chan_first_cdb[3]; + +/* Pointer to last linked and submitted xor CB */ +static struct ppc440spe_adma_desc_slot *xor_last_linked; +static struct ppc440spe_adma_desc_slot *xor_last_submit; + +/* This array is used in data-check operations for storing a pattern */ +static char ppc440spe_qword[16]; + +static atomic_t ppc440spe_adma_err_irq_ref; +static dcr_host_t ppc440spe_mq_dcr_host; +static unsigned int ppc440spe_mq_dcr_len; + +/* Since RXOR operations use the common register (MQ0_CF2H) for setting-up + * the block size in transactions, then we do not allow to activate more than + * only one RXOR transactions simultaneously. So use this var to store + * the information about is RXOR currently active (PPC440SPE_RXOR_RUN bit is + * set) or not (PPC440SPE_RXOR_RUN is clear). + */ +static unsigned long ppc440spe_rxor_state; + +/* These are used in enable & check routines + */ +static u32 ppc440spe_r6_enabled; +static struct ppc440spe_adma_chan *ppc440spe_r6_tchan; +static struct completion ppc440spe_r6_test_comp; + +static int ppc440spe_adma_dma2rxor_prep_src( + struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_rxor *cursor, int index, + int src_cnt, u32 addr); +static void ppc440spe_adma_dma2rxor_set_src( + struct ppc440spe_adma_desc_slot *desc, + int index, dma_addr_t addr); +static void ppc440spe_adma_dma2rxor_set_mult( + struct ppc440spe_adma_desc_slot *desc, + int index, u8 mult); + +#ifdef ADMA_LL_DEBUG +#define ADMA_LL_DBG(x) ({ if (1) x; 0; }) +#else +#define ADMA_LL_DBG(x) ({ if (0) x; 0; }) +#endif + +static void print_cb(struct ppc440spe_adma_chan *chan, void *block) +{ + struct dma_cdb *cdb; + struct xor_cb *cb; + int i; + + switch (chan->device->id) { + case 0: + case 1: + cdb = block; + + pr_debug("CDB at %p [%d]:\n" + "\t attr 0x%02x opc 0x%02x cnt 0x%08x\n" + "\t sg1u 0x%08x sg1l 0x%08x\n" + "\t sg2u 0x%08x sg2l 0x%08x\n" + "\t sg3u 0x%08x sg3l 0x%08x\n", + cdb, chan->device->id, + cdb->attr, cdb->opc, le32_to_cpu(cdb->cnt), + le32_to_cpu(cdb->sg1u), le32_to_cpu(cdb->sg1l), + le32_to_cpu(cdb->sg2u), le32_to_cpu(cdb->sg2l), + le32_to_cpu(cdb->sg3u), le32_to_cpu(cdb->sg3l) + ); + break; + case 2: + cb = block; + + pr_debug("CB at %p [%d]:\n" + "\t cbc 0x%08x cbbc 0x%08x cbs 0x%08x\n" + "\t cbtah 0x%08x cbtal 0x%08x\n" + "\t cblah 0x%08x cblal 0x%08x\n", + cb, chan->device->id, + cb->cbc, cb->cbbc, cb->cbs, + cb->cbtah, cb->cbtal, + cb->cblah, cb->cblal); + for (i = 0; i < 16; i++) { + if (i && !cb->ops[i].h && !cb->ops[i].l) + continue; + pr_debug("\t ops[%2d]: h 0x%08x l 0x%08x\n", + i, cb->ops[i].h, cb->ops[i].l); + } + break; + } +} + +static void print_cb_list(struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *iter) +{ + for (; iter; iter = iter->hw_next) + print_cb(chan, iter->hw_desc); +} + +static void prep_dma_xor_dbg(int id, dma_addr_t dst, dma_addr_t *src, + unsigned int src_cnt) +{ + int i; + + pr_debug("\n%s(%d):\nsrc: ", __func__, id); + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx ", src[i]); + pr_debug("dst:\n\t0x%016llx\n", dst); +} + +static void prep_dma_pq_dbg(int id, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt) +{ + int i; + + pr_debug("\n%s(%d):\nsrc: ", __func__, id); + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx ", src[i]); + pr_debug("dst: "); + for (i = 0; i < 2; i++) + pr_debug("\t0x%016llx ", dst[i]); +} + +static void prep_dma_pqzero_sum_dbg(int id, dma_addr_t *src, + unsigned int src_cnt, + const unsigned char *scf) +{ + int i; + + pr_debug("\n%s(%d):\nsrc(coef): ", __func__, id); + if (scf) { + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx(0x%02x) ", src[i], scf[i]); + } else { + for (i = 0; i < src_cnt; i++) + pr_debug("\t0x%016llx(no) ", src[i]); + } + + pr_debug("dst: "); + for (i = 0; i < 2; i++) + pr_debug("\t0x%016llx ", src[src_cnt + i]); +} + +/****************************************************************************** + * Command (Descriptor) Blocks low-level routines + ******************************************************************************/ +/** + * ppc440spe_desc_init_interrupt - initialize the descriptor for INTERRUPT + * pseudo operation + */ +static void ppc440spe_desc_init_interrupt(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + struct xor_cb *p; + + switch (chan->device->id) { + case PPC440SPE_XOR_ID: + p = desc->hw_desc; + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + /* NOP with Command Block Complete Enable */ + p->cbc = XOR_CBCR_CBCE_BIT; + break; + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + memset(desc->hw_desc, 0, sizeof(struct dma_cdb)); + /* NOP with interrupt */ + set_bit(PPC440SPE_DESC_INT, &desc->flags); + break; + default: + printk(KERN_ERR "Unsupported id %d in %s\n", chan->device->id, + __func__); + break; + } +} + +/** + * ppc440spe_desc_init_null_xor - initialize the descriptor for NULL XOR + * pseudo operation + */ +static void ppc440spe_desc_init_null_xor(struct ppc440spe_adma_desc_slot *desc) +{ + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + desc->hw_next = NULL; + desc->src_cnt = 0; + desc->dst_cnt = 1; +} + +/** + * ppc440spe_desc_init_xor - initialize the descriptor for XOR operation + */ +static void ppc440spe_desc_init_xor(struct ppc440spe_adma_desc_slot *desc, + int src_cnt, unsigned long flags) +{ + struct xor_cb *hw_desc = desc->hw_desc; + + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + desc->hw_next = NULL; + desc->src_cnt = src_cnt; + desc->dst_cnt = 1; + + hw_desc->cbc = XOR_CBCR_TGT_BIT | src_cnt; + if (flags & DMA_PREP_INTERRUPT) + /* Enable interrupt on completion */ + hw_desc->cbc |= XOR_CBCR_CBCE_BIT; +} + +/** + * ppc440spe_desc_init_dma2pq - initialize the descriptor for PQ + * operation in DMA2 controller + */ +static void ppc440spe_desc_init_dma2pq(struct ppc440spe_adma_desc_slot *desc, + int dst_cnt, int src_cnt, unsigned long flags) +{ + struct xor_cb *hw_desc = desc->hw_desc; + + memset(desc->hw_desc, 0, sizeof(struct xor_cb)); + desc->hw_next = NULL; + desc->src_cnt = src_cnt; + desc->dst_cnt = dst_cnt; + memset(desc->reverse_flags, 0, sizeof(desc->reverse_flags)); + desc->descs_per_op = 0; + + hw_desc->cbc = XOR_CBCR_TGT_BIT; + if (flags & DMA_PREP_INTERRUPT) + /* Enable interrupt on completion */ + hw_desc->cbc |= XOR_CBCR_CBCE_BIT; +} + +#define DMA_CTRL_FLAGS_LAST DMA_PREP_FENCE +#define DMA_PREP_ZERO_P (DMA_CTRL_FLAGS_LAST << 1) +#define DMA_PREP_ZERO_Q (DMA_PREP_ZERO_P << 1) + +/** + * ppc440spe_desc_init_dma01pq - initialize the descriptors for PQ operation + * with DMA0/1 + */ +static void ppc440spe_desc_init_dma01pq(struct ppc440spe_adma_desc_slot *desc, + int dst_cnt, int src_cnt, unsigned long flags, + unsigned long op) +{ + struct dma_cdb *hw_desc; + struct ppc440spe_adma_desc_slot *iter; + u8 dopc; + + /* Common initialization of a PQ descriptors chain */ + set_bits(op, &desc->flags); + desc->src_cnt = src_cnt; + desc->dst_cnt = dst_cnt; + + /* WXOR MULTICAST if both P and Q are being computed + * MV_SG1_SG2 if Q only + */ + dopc = (desc->dst_cnt == DMA_DEST_MAX_NUM) ? + DMA_CDB_OPC_MULTICAST : DMA_CDB_OPC_MV_SG1_SG2; + + list_for_each_entry(iter, &desc->group_list, chain_node) { + hw_desc = iter->hw_desc; + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + + if (likely(!list_is_last(&iter->chain_node, + &desc->group_list))) { + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + } else { + /* this is the last descriptor. + * this slot will be pasted from ADMA level + * each time it wants to configure parameters + * of the transaction (src, dst, ...) + */ + iter->hw_next = NULL; + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + } + } + + /* Set OPS depending on WXOR/RXOR type of operation */ + if (!test_bit(PPC440SPE_DESC_RXOR, &desc->flags)) { + /* This is a WXOR only chain: + * - first descriptors are for zeroing destinations + * if PPC440SPE_ZERO_P/Q set; + * - descriptors remained are for GF-XOR operations. + */ + iter = list_first_entry(&desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + + if (test_bit(PPC440SPE_ZERO_P, &desc->flags)) { + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + if (test_bit(PPC440SPE_ZERO_Q, &desc->flags)) { + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + list_for_each_entry_from(iter, &desc->group_list, chain_node) { + hw_desc = iter->hw_desc; + hw_desc->opc = dopc; + } + } else { + /* This is either RXOR-only or mixed RXOR/WXOR */ + + /* The first 1 or 2 slots in chain are always RXOR, + * if need to calculate P & Q, then there are two + * RXOR slots; if only P or only Q, then there is one + */ + iter = list_first_entry(&desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + + if (desc->dst_cnt == DMA_DEST_MAX_NUM) { + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + } + + /* The remaining descs (if any) are WXORs */ + if (test_bit(PPC440SPE_DESC_WXOR, &desc->flags)) { + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + list_for_each_entry_from(iter, &desc->group_list, + chain_node) { + hw_desc = iter->hw_desc; + hw_desc->opc = dopc; + } + } + } +} + +/** + * ppc440spe_desc_init_dma01pqzero_sum - initialize the descriptor + * for PQ_ZERO_SUM operation + */ +static void ppc440spe_desc_init_dma01pqzero_sum( + struct ppc440spe_adma_desc_slot *desc, + int dst_cnt, int src_cnt) +{ + struct dma_cdb *hw_desc; + struct ppc440spe_adma_desc_slot *iter; + int i = 0; + u8 dopc = (dst_cnt == 2) ? DMA_CDB_OPC_MULTICAST : + DMA_CDB_OPC_MV_SG1_SG2; + /* + * Initialize starting from 2nd or 3rd descriptor dependent + * on dst_cnt. First one or two slots are for cloning P + * and/or Q to chan->pdest and/or chan->qdest as we have + * to preserve original P/Q. + */ + iter = list_first_entry(&desc->group_list, + struct ppc440spe_adma_desc_slot, chain_node); + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + + if (dst_cnt > 1) { + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + } + /* initialize each source descriptor in chain */ + list_for_each_entry_from(iter, &desc->group_list, chain_node) { + hw_desc = iter->hw_desc; + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->src_cnt = 0; + iter->dst_cnt = 0; + + /* This is a ZERO_SUM operation: + * - <src_cnt> descriptors starting from 2nd or 3rd + * descriptor are for GF-XOR operations; + * - remaining <dst_cnt> descriptors are for checking the result + */ + if (i++ < src_cnt) + /* MV_SG1_SG2 if only Q is being verified + * MULTICAST if both P and Q are being verified + */ + hw_desc->opc = dopc; + else + /* DMA_CDB_OPC_DCHECK128 operation */ + hw_desc->opc = DMA_CDB_OPC_DCHECK128; + + if (likely(!list_is_last(&iter->chain_node, + &desc->group_list))) { + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } else { + /* this is the last descriptor. + * this slot will be pasted from ADMA level + * each time it wants to configure parameters + * of the transaction (src, dst, ...) + */ + iter->hw_next = NULL; + /* always enable interrupt generation since we get + * the status of pqzero from the handler + */ + set_bit(PPC440SPE_DESC_INT, &iter->flags); + } + } + desc->src_cnt = src_cnt; + desc->dst_cnt = dst_cnt; +} + +/** + * ppc440spe_desc_init_memcpy - initialize the descriptor for MEMCPY operation + */ +static void ppc440spe_desc_init_memcpy(struct ppc440spe_adma_desc_slot *desc, + unsigned long flags) +{ + struct dma_cdb *hw_desc = desc->hw_desc; + + memset(desc->hw_desc, 0, sizeof(struct dma_cdb)); + desc->hw_next = NULL; + desc->src_cnt = 1; + desc->dst_cnt = 1; + + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &desc->flags); + else + clear_bit(PPC440SPE_DESC_INT, &desc->flags); + + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; +} + +/** + * ppc440spe_desc_set_src_addr - set source address into the descriptor + */ +static void ppc440spe_desc_set_src_addr(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + int src_idx, dma_addr_t addrh, + dma_addr_t addrl) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + phys_addr_t addr64, tmplow, tmphi; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + if (!addrh) { + addr64 = addrl; + tmphi = (addr64 >> 32); + tmplow = (addr64 & 0xFFFFFFFF); + } else { + tmphi = addrh; + tmplow = addrl; + } + dma_hw_desc = desc->hw_desc; + dma_hw_desc->sg1l = cpu_to_le32((u32)tmplow); + dma_hw_desc->sg1u |= cpu_to_le32((u32)tmphi); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + xor_hw_desc->ops[src_idx].l = addrl; + xor_hw_desc->ops[src_idx].h |= addrh; + break; + } +} + +/** + * ppc440spe_desc_set_src_mult - set source address mult into the descriptor + */ +static void ppc440spe_desc_set_src_mult(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, u32 mult_index, + int sg_index, unsigned char mult_value) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + u32 *psgu; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + + switch (sg_index) { + /* for RXOR operations set multiplier + * into source cued address + */ + case DMA_CDB_SG_SRC: + psgu = &dma_hw_desc->sg1u; + break; + /* for WXOR operations set multiplier + * into destination cued address(es) + */ + case DMA_CDB_SG_DST1: + psgu = &dma_hw_desc->sg2u; + break; + case DMA_CDB_SG_DST2: + psgu = &dma_hw_desc->sg3u; + break; + default: + BUG(); + } + + *psgu |= cpu_to_le32(mult_value << mult_index); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + break; + default: + BUG(); + } +} + +/** + * ppc440spe_desc_set_dest_addr - set destination address into the descriptor + */ +static void ppc440spe_desc_set_dest_addr(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + dma_addr_t addrh, dma_addr_t addrl, + u32 dst_idx) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + phys_addr_t addr64, tmphi, tmplow; + u32 *psgu, *psgl; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + if (!addrh) { + addr64 = addrl; + tmphi = (addr64 >> 32); + tmplow = (addr64 & 0xFFFFFFFF); + } else { + tmphi = addrh; + tmplow = addrl; + } + dma_hw_desc = desc->hw_desc; + + psgu = dst_idx ? &dma_hw_desc->sg3u : &dma_hw_desc->sg2u; + psgl = dst_idx ? &dma_hw_desc->sg3l : &dma_hw_desc->sg2l; + + *psgl = cpu_to_le32((u32)tmplow); + *psgu |= cpu_to_le32((u32)tmphi); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + xor_hw_desc->cbtal = addrl; + xor_hw_desc->cbtah |= addrh; + break; + } +} + +/** + * ppc440spe_desc_set_byte_count - set number of data bytes involved + * into the operation + */ +static void ppc440spe_desc_set_byte_count(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + u32 byte_count) +{ + struct dma_cdb *dma_hw_desc; + struct xor_cb *xor_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + dma_hw_desc->cnt = cpu_to_le32(byte_count); + break; + case PPC440SPE_XOR_ID: + xor_hw_desc = desc->hw_desc; + xor_hw_desc->cbbc = byte_count; + break; + } +} + +/** + * ppc440spe_desc_set_rxor_block_size - set RXOR block size + */ +static inline void ppc440spe_desc_set_rxor_block_size(u32 byte_count) +{ + /* assume that byte_count is aligned on the 512-boundary; + * thus write it directly to the register (bits 23:31 are + * reserved there). + */ + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CF2H, byte_count); +} + +/** + * ppc440spe_desc_set_dcheck - set CHECK pattern + */ +static void ppc440spe_desc_set_dcheck(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, u8 *qword) +{ + struct dma_cdb *dma_hw_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_hw_desc = desc->hw_desc; + iowrite32(qword[0], &dma_hw_desc->sg3l); + iowrite32(qword[4], &dma_hw_desc->sg3u); + iowrite32(qword[8], &dma_hw_desc->sg2l); + iowrite32(qword[12], &dma_hw_desc->sg2u); + break; + default: + BUG(); + } +} + +/** + * ppc440spe_xor_set_link - set link address in xor CB + */ +static void ppc440spe_xor_set_link(struct ppc440spe_adma_desc_slot *prev_desc, + struct ppc440spe_adma_desc_slot *next_desc) +{ + struct xor_cb *xor_hw_desc = prev_desc->hw_desc; + + if (unlikely(!next_desc || !(next_desc->phys))) { + printk(KERN_ERR "%s: next_desc=0x%p; next_desc->phys=0x%llx\n", + __func__, next_desc, + next_desc ? next_desc->phys : 0); + BUG(); + } + + xor_hw_desc->cbs = 0; + xor_hw_desc->cblal = next_desc->phys; + xor_hw_desc->cblah = 0; + xor_hw_desc->cbc |= XOR_CBCR_LNK_BIT; +} + +/** + * ppc440spe_desc_set_link - set the address of descriptor following this + * descriptor in chain + */ +static void ppc440spe_desc_set_link(struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *prev_desc, + struct ppc440spe_adma_desc_slot *next_desc) +{ + unsigned long flags; + struct ppc440spe_adma_desc_slot *tail = next_desc; + + if (unlikely(!prev_desc || !next_desc || + (prev_desc->hw_next && prev_desc->hw_next != next_desc))) { + /* If previous next is overwritten something is wrong. + * though we may refetch from append to initiate list + * processing; in this case - it's ok. + */ + printk(KERN_ERR "%s: prev_desc=0x%p; next_desc=0x%p; " + "prev->hw_next=0x%p\n", __func__, prev_desc, + next_desc, prev_desc ? prev_desc->hw_next : 0); + BUG(); + } + + local_irq_save(flags); + + /* do s/w chaining both for DMA and XOR descriptors */ + prev_desc->hw_next = next_desc; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + break; + case PPC440SPE_XOR_ID: + /* bind descriptor to the chain */ + while (tail->hw_next) + tail = tail->hw_next; + xor_last_linked = tail; + + if (prev_desc == xor_last_submit) + /* do not link to the last submitted CB */ + break; + ppc440spe_xor_set_link(prev_desc, next_desc); + break; + } + + local_irq_restore(flags); +} + +/** + * ppc440spe_desc_get_link - get the address of the descriptor that + * follows this one + */ +static inline u32 ppc440spe_desc_get_link(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + if (!desc->hw_next) + return 0; + + return desc->hw_next->phys; +} + +/** + * ppc440spe_desc_is_aligned - check alignment + */ +static inline int ppc440spe_desc_is_aligned( + struct ppc440spe_adma_desc_slot *desc, int num_slots) +{ + return (desc->idx & (num_slots - 1)) ? 0 : 1; +} + +/** + * ppc440spe_chan_xor_slot_count - get the number of slots necessary for + * XOR operation + */ +static int ppc440spe_chan_xor_slot_count(size_t len, int src_cnt, + int *slots_per_op) +{ + int slot_cnt; + + /* each XOR descriptor provides up to 16 source operands */ + slot_cnt = *slots_per_op = (src_cnt + XOR_MAX_OPS - 1)/XOR_MAX_OPS; + + if (likely(len <= PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT)) + return slot_cnt; + + printk(KERN_ERR "%s: len %d > max %d !!\n", + __func__, len, PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT); + BUG(); + return slot_cnt; +} + +/** + * ppc440spe_dma2_pq_slot_count - get the number of slots necessary for + * DMA2 PQ operation + */ +static int ppc440spe_dma2_pq_slot_count(dma_addr_t *srcs, + int src_cnt, size_t len) +{ + signed long long order = 0; + int state = 0; + int addr_count = 0; + int i; + for (i = 1; i < src_cnt; i++) { + dma_addr_t cur_addr = srcs[i]; + dma_addr_t old_addr = srcs[i-1]; + switch (state) { + case 0: + if (cur_addr == old_addr + len) { + /* direct RXOR */ + order = 1; + state = 1; + if (i == src_cnt-1) + addr_count++; + } else if (old_addr == cur_addr + len) { + /* reverse RXOR */ + order = -1; + state = 1; + if (i == src_cnt-1) + addr_count++; + } else { + state = 3; + } + break; + case 1: + if (i == src_cnt-2 || (order == -1 + && cur_addr != old_addr - len)) { + order = 0; + state = 0; + addr_count++; + } else if (cur_addr == old_addr + len*order) { + state = 2; + if (i == src_cnt-1) + addr_count++; + } else if (cur_addr == old_addr + 2*len) { + state = 2; + if (i == src_cnt-1) + addr_count++; + } else if (cur_addr == old_addr + 3*len) { + state = 2; + if (i == src_cnt-1) + addr_count++; + } else { + order = 0; + state = 0; + addr_count++; + } + break; + case 2: + order = 0; + state = 0; + addr_count++; + break; + } + if (state == 3) + break; + } + if (src_cnt <= 1 || (state != 1 && state != 2)) { + pr_err("%s: src_cnt=%d, state=%d, addr_count=%d, order=%lld\n", + __func__, src_cnt, state, addr_count, order); + for (i = 0; i < src_cnt; i++) + pr_err("\t[%d] 0x%llx \n", i, srcs[i]); + BUG(); + } + + return (addr_count + XOR_MAX_OPS - 1) / XOR_MAX_OPS; +} + + +/****************************************************************************** + * ADMA channel low-level routines + ******************************************************************************/ + +static u32 +ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan); +static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan); + +/** + * ppc440spe_adma_device_clear_eot_status - interrupt ack to XOR or DMA engine + */ +static void ppc440spe_adma_device_clear_eot_status( + struct ppc440spe_adma_chan *chan) +{ + struct dma_regs *dma_reg; + struct xor_regs *xor_reg; + u8 *p = chan->device->dma_desc_pool_virt; + struct dma_cdb *cdb; + u32 rv, i; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* read FIFO to ack */ + dma_reg = chan->device->dma_reg; + while ((rv = ioread32(&dma_reg->csfpl))) { + i = rv & DMA_CDB_ADDR_MSK; + cdb = (struct dma_cdb *)&p[i - + (u32)chan->device->dma_desc_pool]; + + /* Clear opcode to ack. This is necessary for + * ZeroSum operations only + */ + cdb->opc = 0; + + if (test_bit(PPC440SPE_RXOR_RUN, + &ppc440spe_rxor_state)) { + /* probably this is a completed RXOR op, + * get pointer to CDB using the fact that + * physical and virtual addresses of CDB + * in pools have the same offsets + */ + if (le32_to_cpu(cdb->sg1u) & + DMA_CUED_XOR_BASE) { + /* this is a RXOR */ + clear_bit(PPC440SPE_RXOR_RUN, + &ppc440spe_rxor_state); + } + } + + if (rv & DMA_CDB_STATUS_MSK) { + /* ZeroSum check failed + */ + struct ppc440spe_adma_desc_slot *iter; + dma_addr_t phys = rv & ~DMA_CDB_MSK; + + /* + * Update the status of corresponding + * descriptor. + */ + list_for_each_entry(iter, &chan->chain, + chain_node) { + if (iter->phys == phys) + break; + } + /* + * if cannot find the corresponding + * slot it's a bug + */ + BUG_ON(&iter->chain_node == &chan->chain); + + if (iter->xor_check_result) { + if (test_bit(PPC440SPE_DESC_PCHECK, + &iter->flags)) { + *iter->xor_check_result |= + SUM_CHECK_P_RESULT; + } else + if (test_bit(PPC440SPE_DESC_QCHECK, + &iter->flags)) { + *iter->xor_check_result |= + SUM_CHECK_Q_RESULT; + } else + BUG(); + } + } + } + + rv = ioread32(&dma_reg->dsts); + if (rv) { + pr_err("DMA%d err status: 0x%x\n", + chan->device->id, rv); + /* write back to clear */ + iowrite32(rv, &dma_reg->dsts); + } + break; + case PPC440SPE_XOR_ID: + /* reset status bits to ack */ + xor_reg = chan->device->xor_reg; + rv = ioread32be(&xor_reg->sr); + iowrite32be(rv, &xor_reg->sr); + + if (rv & (XOR_IE_ICBIE_BIT|XOR_IE_ICIE_BIT|XOR_IE_RPTIE_BIT)) { + if (rv & XOR_IE_RPTIE_BIT) { + /* Read PLB Timeout Error. + * Try to resubmit the CB + */ + u32 val = ioread32be(&xor_reg->ccbalr); + + iowrite32be(val, &xor_reg->cblalr); + + val = ioread32be(&xor_reg->crsr); + iowrite32be(val | XOR_CRSR_XAE_BIT, + &xor_reg->crsr); + } else + pr_err("XOR ERR 0x%x status\n", rv); + break; + } + + /* if the XORcore is idle, but there are unprocessed CBs + * then refetch the s/w chain here + */ + if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) && + do_xor_refetch) + ppc440spe_chan_append(chan); + break; + } +} + +/** + * ppc440spe_chan_is_busy - get the channel status + */ +static int ppc440spe_chan_is_busy(struct ppc440spe_adma_chan *chan) +{ + struct dma_regs *dma_reg; + struct xor_regs *xor_reg; + int busy = 0; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_reg = chan->device->dma_reg; + /* if command FIFO's head and tail pointers are equal and + * status tail is the same as command, then channel is free + */ + if (ioread16(&dma_reg->cpfhp) != ioread16(&dma_reg->cpftp) || + ioread16(&dma_reg->cpftp) != ioread16(&dma_reg->csftp)) + busy = 1; + break; + case PPC440SPE_XOR_ID: + /* use the special status bit for the XORcore + */ + xor_reg = chan->device->xor_reg; + busy = (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) ? 1 : 0; + break; + } + + return busy; +} + +/** + * ppc440spe_chan_set_first_xor_descriptor - init XORcore chain + */ +static void ppc440spe_chan_set_first_xor_descriptor( + struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *next_desc) +{ + struct xor_regs *xor_reg = chan->device->xor_reg; + + if (ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT) + printk(KERN_INFO "%s: Warn: XORcore is running " + "when try to set the first CDB!\n", + __func__); + + xor_last_submit = xor_last_linked = next_desc; + + iowrite32be(XOR_CRSR_64BA_BIT, &xor_reg->crsr); + + iowrite32be(next_desc->phys, &xor_reg->cblalr); + iowrite32be(0, &xor_reg->cblahr); + iowrite32be(ioread32be(&xor_reg->cbcr) | XOR_CBCR_LNK_BIT, + &xor_reg->cbcr); + + chan->hw_chain_inited = 1; +} + +/** + * ppc440spe_dma_put_desc - put DMA0,1 descriptor to FIFO. + * called with irqs disabled + */ +static void ppc440spe_dma_put_desc(struct ppc440spe_adma_chan *chan, + struct ppc440spe_adma_desc_slot *desc) +{ + u32 pcdb; + struct dma_regs *dma_reg = chan->device->dma_reg; + + pcdb = desc->phys; + if (!test_bit(PPC440SPE_DESC_INT, &desc->flags)) + pcdb |= DMA_CDB_NO_INT; + + chan_last_sub[chan->device->id] = desc; + + ADMA_LL_DBG(print_cb(chan, desc->hw_desc)); + + iowrite32(pcdb, &dma_reg->cpfpl); +} + +/** + * ppc440spe_chan_append - update the h/w chain in the channel + */ +static void ppc440spe_chan_append(struct ppc440spe_adma_chan *chan) +{ + struct xor_regs *xor_reg; + struct ppc440spe_adma_desc_slot *iter; + struct xor_cb *xcb; + u32 cur_desc; + unsigned long flags; + + local_irq_save(flags); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + cur_desc = ppc440spe_chan_get_current_descriptor(chan); + + if (likely(cur_desc)) { + iter = chan_last_sub[chan->device->id]; + BUG_ON(!iter); + } else { + /* first peer */ + iter = chan_first_cdb[chan->device->id]; + BUG_ON(!iter); + ppc440spe_dma_put_desc(chan, iter); + chan->hw_chain_inited = 1; + } + + /* is there something new to append */ + if (!iter->hw_next) + break; + + /* flush descriptors from the s/w queue to fifo */ + list_for_each_entry_continue(iter, &chan->chain, chain_node) { + ppc440spe_dma_put_desc(chan, iter); + if (!iter->hw_next) + break; + } + break; + case PPC440SPE_XOR_ID: + /* update h/w links and refetch */ + if (!xor_last_submit->hw_next) + break; + + xor_reg = chan->device->xor_reg; + /* the last linked CDB has to generate an interrupt + * that we'd be able to append the next lists to h/w + * regardless of the XOR engine state at the moment of + * appending of these next lists + */ + xcb = xor_last_linked->hw_desc; + xcb->cbc |= XOR_CBCR_CBCE_BIT; + + if (!(ioread32be(&xor_reg->sr) & XOR_SR_XCP_BIT)) { + /* XORcore is idle. Refetch now */ + do_xor_refetch = 0; + ppc440spe_xor_set_link(xor_last_submit, + xor_last_submit->hw_next); + + ADMA_LL_DBG(print_cb_list(chan, + xor_last_submit->hw_next)); + + xor_last_submit = xor_last_linked; + iowrite32be(ioread32be(&xor_reg->crsr) | + XOR_CRSR_RCBE_BIT | XOR_CRSR_64BA_BIT, + &xor_reg->crsr); + } else { + /* XORcore is running. Refetch later in the handler */ + do_xor_refetch = 1; + } + + break; + } + + local_irq_restore(flags); +} + +/** + * ppc440spe_chan_get_current_descriptor - get the currently executed descriptor + */ +static u32 +ppc440spe_chan_get_current_descriptor(struct ppc440spe_adma_chan *chan) +{ + struct dma_regs *dma_reg; + struct xor_regs *xor_reg; + + if (unlikely(!chan->hw_chain_inited)) + /* h/w descriptor chain is not initialized yet */ + return 0; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_reg = chan->device->dma_reg; + return ioread32(&dma_reg->acpl) & (~DMA_CDB_MSK); + case PPC440SPE_XOR_ID: + xor_reg = chan->device->xor_reg; + return ioread32be(&xor_reg->ccbalr); + } + return 0; +} + +/** + * ppc440spe_chan_run - enable the channel + */ +static void ppc440spe_chan_run(struct ppc440spe_adma_chan *chan) +{ + struct xor_regs *xor_reg; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* DMAs are always enabled, do nothing */ + break; + case PPC440SPE_XOR_ID: + /* drain write buffer */ + xor_reg = chan->device->xor_reg; + + /* fetch descriptor pointed to in <link> */ + iowrite32be(XOR_CRSR_64BA_BIT | XOR_CRSR_XAE_BIT, + &xor_reg->crsr); + break; + } +} + +/****************************************************************************** + * ADMA device level + ******************************************************************************/ + +static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan); +static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan); + +static dma_cookie_t +ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx); + +static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t addr, int index); +static void +ppc440spe_adma_memcpy_xor_set_src(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t addr, int index); + +static void +ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t *paddr, unsigned long flags); +static void +ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t addr, int index); +static void +ppc440spe_adma_pq_set_src_mult(struct ppc440spe_adma_desc_slot *tx, + unsigned char mult, int index, int dst_pos); +static void +ppc440spe_adma_pqzero_sum_set_dest(struct ppc440spe_adma_desc_slot *tx, + dma_addr_t paddr, dma_addr_t qaddr); + +static struct page *ppc440spe_rxor_srcs[32]; + +/** + * ppc440spe_can_rxor - check if the operands may be processed with RXOR + */ +static int ppc440spe_can_rxor(struct page **srcs, int src_cnt, size_t len) +{ + int i, order = 0, state = 0; + int idx = 0; + + if (unlikely(!(src_cnt > 1))) + return 0; + + BUG_ON(src_cnt > ARRAY_SIZE(ppc440spe_rxor_srcs)); + + /* Skip holes in the source list before checking */ + for (i = 0; i < src_cnt; i++) { + if (!srcs[i]) + continue; + ppc440spe_rxor_srcs[idx++] = srcs[i]; + } + src_cnt = idx; + + for (i = 1; i < src_cnt; i++) { + char *cur_addr = page_address(ppc440spe_rxor_srcs[i]); + char *old_addr = page_address(ppc440spe_rxor_srcs[i - 1]); + + switch (state) { + case 0: + if (cur_addr == old_addr + len) { + /* direct RXOR */ + order = 1; + state = 1; + } else if (old_addr == cur_addr + len) { + /* reverse RXOR */ + order = -1; + state = 1; + } else + goto out; + break; + case 1: + if ((i == src_cnt - 2) || + (order == -1 && cur_addr != old_addr - len)) { + order = 0; + state = 0; + } else if ((cur_addr == old_addr + len * order) || + (cur_addr == old_addr + 2 * len) || + (cur_addr == old_addr + 3 * len)) { + state = 2; + } else { + order = 0; + state = 0; + } + break; + case 2: + order = 0; + state = 0; + break; + } + } + +out: + if (state == 1 || state == 2) + return 1; + + return 0; +} + +/** + * ppc440spe_adma_device_estimate - estimate the efficiency of processing + * the operation given on this channel. It's assumed that 'chan' is + * capable to process 'cap' type of operation. + * @chan: channel to use + * @cap: type of transaction + * @dst_lst: array of destination pointers + * @dst_cnt: number of destination operands + * @src_lst: array of source pointers + * @src_cnt: number of source operands + * @src_sz: size of each source operand + */ +static int ppc440spe_adma_estimate(struct dma_chan *chan, + enum dma_transaction_type cap, struct page **dst_lst, int dst_cnt, + struct page **src_lst, int src_cnt, size_t src_sz) +{ + int ef = 1; + + if (cap == DMA_PQ || cap == DMA_PQ_VAL) { + /* If RAID-6 capabilities were not activated don't try + * to use them + */ + if (unlikely(!ppc440spe_r6_enabled)) + return -1; + } + /* In the current implementation of ppc440spe ADMA driver it + * makes sense to pick out only pq case, because it may be + * processed: + * (1) either using Biskup method on DMA2; + * (2) or on DMA0/1. + * Thus we give a favour to (1) if the sources are suitable; + * else let it be processed on one of the DMA0/1 engines. + * In the sum_product case where destination is also the + * source process it on DMA0/1 only. + */ + if (cap == DMA_PQ && chan->chan_id == PPC440SPE_XOR_ID) { + + if (dst_cnt == 1 && src_cnt == 2 && dst_lst[0] == src_lst[1]) + ef = 0; /* sum_product case, process on DMA0/1 */ + else if (ppc440spe_can_rxor(src_lst, src_cnt, src_sz)) + ef = 3; /* override (DMA0/1 + idle) */ + else + ef = 0; /* can't process on DMA2 if !rxor */ + } + + /* channel idleness increases the priority */ + if (likely(ef) && + !ppc440spe_chan_is_busy(to_ppc440spe_adma_chan(chan))) + ef++; + + return ef; +} + +struct dma_chan * +ppc440spe_async_tx_find_best_channel(enum dma_transaction_type cap, + struct page **dst_lst, int dst_cnt, struct page **src_lst, + int src_cnt, size_t src_sz) +{ + struct dma_chan *best_chan = NULL; + struct ppc_dma_chan_ref *ref; + int best_rank = -1; + + if (unlikely(!src_sz)) + return NULL; + if (src_sz > PAGE_SIZE) { + /* + * should a user of the api ever pass > PAGE_SIZE requests + * we sort out cases where temporary page-sized buffers + * are used. + */ + switch (cap) { + case DMA_PQ: + if (src_cnt == 1 && dst_lst[1] == src_lst[0]) + return NULL; + if (src_cnt == 2 && dst_lst[1] == src_lst[1]) + return NULL; + break; + case DMA_PQ_VAL: + case DMA_XOR_VAL: + return NULL; + default: + break; + } + } + + list_for_each_entry(ref, &ppc440spe_adma_chan_list, node) { + if (dma_has_cap(cap, ref->chan->device->cap_mask)) { + int rank; + + rank = ppc440spe_adma_estimate(ref->chan, cap, dst_lst, + dst_cnt, src_lst, src_cnt, src_sz); + if (rank > best_rank) { + best_rank = rank; + best_chan = ref->chan; + } + } + } + + return best_chan; +} +EXPORT_SYMBOL_GPL(ppc440spe_async_tx_find_best_channel); + +/** + * ppc440spe_get_group_entry - get group entry with index idx + * @tdesc: is the last allocated slot in the group. + */ +static struct ppc440spe_adma_desc_slot * +ppc440spe_get_group_entry(struct ppc440spe_adma_desc_slot *tdesc, u32 entry_idx) +{ + struct ppc440spe_adma_desc_slot *iter = tdesc->group_head; + int i = 0; + + if (entry_idx < 0 || entry_idx >= (tdesc->src_cnt + tdesc->dst_cnt)) { + printk("%s: entry_idx %d, src_cnt %d, dst_cnt %d\n", + __func__, entry_idx, tdesc->src_cnt, tdesc->dst_cnt); + BUG(); + } + + list_for_each_entry(iter, &tdesc->group_list, chain_node) { + if (i++ == entry_idx) + break; + } + return iter; +} + +/** + * ppc440spe_adma_free_slots - flags descriptor slots for reuse + * @slot: Slot to free + * Caller must hold &ppc440spe_chan->lock while calling this function + */ +static void ppc440spe_adma_free_slots(struct ppc440spe_adma_desc_slot *slot, + struct ppc440spe_adma_chan *chan) +{ + int stride = slot->slots_per_op; + + while (stride--) { + slot->slots_per_op = 0; + slot = list_entry(slot->slot_node.next, + struct ppc440spe_adma_desc_slot, + slot_node); + } +} + +/** + * ppc440spe_adma_run_tx_complete_actions - call functions to be called + * upon completion + */ +static dma_cookie_t ppc440spe_adma_run_tx_complete_actions( + struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan, + dma_cookie_t cookie) +{ + BUG_ON(desc->async_tx.cookie < 0); + if (desc->async_tx.cookie > 0) { + cookie = desc->async_tx.cookie; + desc->async_tx.cookie = 0; + + /* call the callback (must not sleep or submit new + * operations to this channel) + */ + if (desc->async_tx.callback) + desc->async_tx.callback( + desc->async_tx.callback_param); + + dma_descriptor_unmap(&desc->async_tx); + } + + /* run dependent operations */ + dma_run_dependencies(&desc->async_tx); + + return cookie; +} + +/** + * ppc440spe_adma_clean_slot - clean up CDB slot (if ack is set) + */ +static int ppc440spe_adma_clean_slot(struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_adma_chan *chan) +{ + /* the client is allowed to attach dependent operations + * until 'ack' is set + */ + if (!async_tx_test_ack(&desc->async_tx)) + return 0; + + /* leave the last descriptor in the chain + * so we can append to it + */ + if (list_is_last(&desc->chain_node, &chan->chain) || + desc->phys == ppc440spe_chan_get_current_descriptor(chan)) + return 1; + + if (chan->device->id != PPC440SPE_XOR_ID) { + /* our DMA interrupt handler clears opc field of + * each processed descriptor. For all types of + * operations except for ZeroSum we do not actually + * need ack from the interrupt handler. ZeroSum is a + * special case since the result of this operation + * is available from the handler only, so if we see + * such type of descriptor (which is unprocessed yet) + * then leave it in chain. + */ + struct dma_cdb *cdb = desc->hw_desc; + if (cdb->opc == DMA_CDB_OPC_DCHECK128) + return 1; + } + + dev_dbg(chan->device->common.dev, "\tfree slot %llx: %d stride: %d\n", + desc->phys, desc->idx, desc->slots_per_op); + + list_del(&desc->chain_node); + ppc440spe_adma_free_slots(desc, chan); + return 0; +} + +/** + * __ppc440spe_adma_slot_cleanup - this is the common clean-up routine + * which runs through the channel CDBs list until reach the descriptor + * currently processed. When routine determines that all CDBs of group + * are completed then corresponding callbacks (if any) are called and slots + * are freed. + */ +static void __ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan) +{ + struct ppc440spe_adma_desc_slot *iter, *_iter, *group_start = NULL; + dma_cookie_t cookie = 0; + u32 current_desc = ppc440spe_chan_get_current_descriptor(chan); + int busy = ppc440spe_chan_is_busy(chan); + int seen_current = 0, slot_cnt = 0, slots_per_op = 0; + + dev_dbg(chan->device->common.dev, "ppc440spe adma%d: %s\n", + chan->device->id, __func__); + + if (!current_desc) { + /* There were no transactions yet, so + * nothing to clean + */ + return; + } + + /* free completed slots from the chain starting with + * the oldest descriptor + */ + list_for_each_entry_safe(iter, _iter, &chan->chain, + chain_node) { + dev_dbg(chan->device->common.dev, "\tcookie: %d slot: %d " + "busy: %d this_desc: %#llx next_desc: %#x " + "cur: %#x ack: %d\n", + iter->async_tx.cookie, iter->idx, busy, iter->phys, + ppc440spe_desc_get_link(iter, chan), current_desc, + async_tx_test_ack(&iter->async_tx)); + prefetch(_iter); + prefetch(&_iter->async_tx); + + /* do not advance past the current descriptor loaded into the + * hardware channel,subsequent descriptors are either in process + * or have not been submitted + */ + if (seen_current) + break; + + /* stop the search if we reach the current descriptor and the + * channel is busy, or if it appears that the current descriptor + * needs to be re-read (i.e. has been appended to) + */ + if (iter->phys == current_desc) { + BUG_ON(seen_current++); + if (busy || ppc440spe_desc_get_link(iter, chan)) { + /* not all descriptors of the group have + * been completed; exit. + */ + break; + } + } + + /* detect the start of a group transaction */ + if (!slot_cnt && !slots_per_op) { + slot_cnt = iter->slot_cnt; + slots_per_op = iter->slots_per_op; + if (slot_cnt <= slots_per_op) { + slot_cnt = 0; + slots_per_op = 0; + } + } + + if (slot_cnt) { + if (!group_start) + group_start = iter; + slot_cnt -= slots_per_op; + } + + /* all the members of a group are complete */ + if (slots_per_op != 0 && slot_cnt == 0) { + struct ppc440spe_adma_desc_slot *grp_iter, *_grp_iter; + int end_of_chain = 0; + + /* clean up the group */ + slot_cnt = group_start->slot_cnt; + grp_iter = group_start; + list_for_each_entry_safe_from(grp_iter, _grp_iter, + &chan->chain, chain_node) { + + cookie = ppc440spe_adma_run_tx_complete_actions( + grp_iter, chan, cookie); + + slot_cnt -= slots_per_op; + end_of_chain = ppc440spe_adma_clean_slot( + grp_iter, chan); + if (end_of_chain && slot_cnt) { + /* Should wait for ZeroSum completion */ + if (cookie > 0) + chan->common.completed_cookie = cookie; + return; + } + + if (slot_cnt == 0 || end_of_chain) + break; + } + + /* the group should be complete at this point */ + BUG_ON(slot_cnt); + + slots_per_op = 0; + group_start = NULL; + if (end_of_chain) + break; + else + continue; + } else if (slots_per_op) /* wait for group completion */ + continue; + + cookie = ppc440spe_adma_run_tx_complete_actions(iter, chan, + cookie); + + if (ppc440spe_adma_clean_slot(iter, chan)) + break; + } + + BUG_ON(!seen_current); + + if (cookie > 0) { + chan->common.completed_cookie = cookie; + pr_debug("\tcompleted cookie %d\n", cookie); + } + +} + +/** + * ppc440spe_adma_tasklet - clean up watch-dog initiator + */ +static void ppc440spe_adma_tasklet(unsigned long data) +{ + struct ppc440spe_adma_chan *chan = (struct ppc440spe_adma_chan *) data; + + spin_lock_nested(&chan->lock, SINGLE_DEPTH_NESTING); + __ppc440spe_adma_slot_cleanup(chan); + spin_unlock(&chan->lock); +} + +/** + * ppc440spe_adma_slot_cleanup - clean up scheduled initiator + */ +static void ppc440spe_adma_slot_cleanup(struct ppc440spe_adma_chan *chan) +{ + spin_lock_bh(&chan->lock); + __ppc440spe_adma_slot_cleanup(chan); + spin_unlock_bh(&chan->lock); +} + +/** + * ppc440spe_adma_alloc_slots - allocate free slots (if any) + */ +static struct ppc440spe_adma_desc_slot *ppc440spe_adma_alloc_slots( + struct ppc440spe_adma_chan *chan, int num_slots, + int slots_per_op) +{ + struct ppc440spe_adma_desc_slot *iter = NULL, *_iter; + struct ppc440spe_adma_desc_slot *alloc_start = NULL; + struct list_head chain = LIST_HEAD_INIT(chain); + int slots_found, retry = 0; + + + BUG_ON(!num_slots || !slots_per_op); + /* start search from the last allocated descrtiptor + * if a contiguous allocation can not be found start searching + * from the beginning of the list + */ +retry: + slots_found = 0; + if (retry == 0) + iter = chan->last_used; + else + iter = list_entry(&chan->all_slots, + struct ppc440spe_adma_desc_slot, + slot_node); + list_for_each_entry_safe_continue(iter, _iter, &chan->all_slots, + slot_node) { + prefetch(_iter); + prefetch(&_iter->async_tx); + if (iter->slots_per_op) { + slots_found = 0; + continue; + } + + /* start the allocation if the slot is correctly aligned */ + if (!slots_found++) + alloc_start = iter; + + if (slots_found == num_slots) { + struct ppc440spe_adma_desc_slot *alloc_tail = NULL; + struct ppc440spe_adma_desc_slot *last_used = NULL; + + iter = alloc_start; + while (num_slots) { + int i; + /* pre-ack all but the last descriptor */ + if (num_slots != slots_per_op) + async_tx_ack(&iter->async_tx); + + list_add_tail(&iter->chain_node, &chain); + alloc_tail = iter; + iter->async_tx.cookie = 0; + iter->hw_next = NULL; + iter->flags = 0; + iter->slot_cnt = num_slots; + iter->xor_check_result = NULL; + for (i = 0; i < slots_per_op; i++) { + iter->slots_per_op = slots_per_op - i; + last_used = iter; + iter = list_entry(iter->slot_node.next, + struct ppc440spe_adma_desc_slot, + slot_node); + } + num_slots -= slots_per_op; + } + alloc_tail->group_head = alloc_start; + alloc_tail->async_tx.cookie = -EBUSY; + list_splice(&chain, &alloc_tail->group_list); + chan->last_used = last_used; + return alloc_tail; + } + } + if (!retry++) + goto retry; + + /* try to free some slots if the allocation fails */ + tasklet_schedule(&chan->irq_tasklet); + return NULL; +} + +/** + * ppc440spe_adma_alloc_chan_resources - allocate pools for CDB slots + */ +static int ppc440spe_adma_alloc_chan_resources(struct dma_chan *chan) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *slot = NULL; + char *hw_desc; + int i, db_sz; + int init; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + init = ppc440spe_chan->slots_allocated ? 0 : 1; + chan->chan_id = ppc440spe_chan->device->id; + + /* Allocate descriptor slots */ + i = ppc440spe_chan->slots_allocated; + if (ppc440spe_chan->device->id != PPC440SPE_XOR_ID) + db_sz = sizeof(struct dma_cdb); + else + db_sz = sizeof(struct xor_cb); + + for (; i < (ppc440spe_chan->device->pool_size / db_sz); i++) { + slot = kzalloc(sizeof(struct ppc440spe_adma_desc_slot), + GFP_KERNEL); + if (!slot) { + printk(KERN_INFO "SPE ADMA Channel only initialized" + " %d descriptor slots", i--); + break; + } + + hw_desc = (char *) ppc440spe_chan->device->dma_desc_pool_virt; + slot->hw_desc = (void *) &hw_desc[i * db_sz]; + dma_async_tx_descriptor_init(&slot->async_tx, chan); + slot->async_tx.tx_submit = ppc440spe_adma_tx_submit; + INIT_LIST_HEAD(&slot->chain_node); + INIT_LIST_HEAD(&slot->slot_node); + INIT_LIST_HEAD(&slot->group_list); + slot->phys = ppc440spe_chan->device->dma_desc_pool + i * db_sz; + slot->idx = i; + + spin_lock_bh(&ppc440spe_chan->lock); + ppc440spe_chan->slots_allocated++; + list_add_tail(&slot->slot_node, &ppc440spe_chan->all_slots); + spin_unlock_bh(&ppc440spe_chan->lock); + } + + if (i && !ppc440spe_chan->last_used) { + ppc440spe_chan->last_used = + list_entry(ppc440spe_chan->all_slots.next, + struct ppc440spe_adma_desc_slot, + slot_node); + } + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: allocated %d descriptor slots\n", + ppc440spe_chan->device->id, i); + + /* initialize the channel and the chain with a null operation */ + if (init) { + switch (ppc440spe_chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + ppc440spe_chan->hw_chain_inited = 0; + /* Use WXOR for self-testing */ + if (!ppc440spe_r6_tchan) + ppc440spe_r6_tchan = ppc440spe_chan; + break; + case PPC440SPE_XOR_ID: + ppc440spe_chan_start_null_xor(ppc440spe_chan); + break; + default: + BUG(); + } + ppc440spe_chan->needs_unmap = 1; + } + + return (i > 0) ? i : -ENOMEM; +} + +/** + * ppc440spe_rxor_set_region_data - + */ +static void ppc440spe_rxor_set_region(struct ppc440spe_adma_desc_slot *desc, + u8 xor_arg_no, u32 mask) +{ + struct xor_cb *xcb = desc->hw_desc; + + xcb->ops[xor_arg_no].h |= mask; +} + +/** + * ppc440spe_rxor_set_src - + */ +static void ppc440spe_rxor_set_src(struct ppc440spe_adma_desc_slot *desc, + u8 xor_arg_no, dma_addr_t addr) +{ + struct xor_cb *xcb = desc->hw_desc; + + xcb->ops[xor_arg_no].h |= DMA_CUED_XOR_BASE; + xcb->ops[xor_arg_no].l = addr; +} + +/** + * ppc440spe_rxor_set_mult - + */ +static void ppc440spe_rxor_set_mult(struct ppc440spe_adma_desc_slot *desc, + u8 xor_arg_no, u8 idx, u8 mult) +{ + struct xor_cb *xcb = desc->hw_desc; + + xcb->ops[xor_arg_no].h |= mult << (DMA_CUED_MULT1_OFF + idx * 8); +} + +/** + * ppc440spe_adma_check_threshold - append CDBs to h/w chain if threshold + * has been achieved + */ +static void ppc440spe_adma_check_threshold(struct ppc440spe_adma_chan *chan) +{ + dev_dbg(chan->device->common.dev, "ppc440spe adma%d: pending: %d\n", + chan->device->id, chan->pending); + + if (chan->pending >= PPC440SPE_ADMA_THRESHOLD) { + chan->pending = 0; + ppc440spe_chan_append(chan); + } +} + +/** + * ppc440spe_adma_tx_submit - submit new descriptor group to the channel + * (it's not necessary that descriptors will be submitted to the h/w + * chains too right now) + */ +static dma_cookie_t ppc440spe_adma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct ppc440spe_adma_desc_slot *sw_desc; + struct ppc440spe_adma_chan *chan = to_ppc440spe_adma_chan(tx->chan); + struct ppc440spe_adma_desc_slot *group_start, *old_chain_tail; + int slot_cnt; + int slots_per_op; + dma_cookie_t cookie; + + sw_desc = tx_to_ppc440spe_adma_slot(tx); + + group_start = sw_desc->group_head; + slot_cnt = group_start->slot_cnt; + slots_per_op = group_start->slots_per_op; + + spin_lock_bh(&chan->lock); + cookie = dma_cookie_assign(tx); + + if (unlikely(list_empty(&chan->chain))) { + /* first peer */ + list_splice_init(&sw_desc->group_list, &chan->chain); + chan_first_cdb[chan->device->id] = group_start; + } else { + /* isn't first peer, bind CDBs to chain */ + old_chain_tail = list_entry(chan->chain.prev, + struct ppc440spe_adma_desc_slot, + chain_node); + list_splice_init(&sw_desc->group_list, + &old_chain_tail->chain_node); + /* fix up the hardware chain */ + ppc440spe_desc_set_link(chan, old_chain_tail, group_start); + } + + /* increment the pending count by the number of operations */ + chan->pending += slot_cnt / slots_per_op; + ppc440spe_adma_check_threshold(chan); + spin_unlock_bh(&chan->lock); + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s cookie: %d slot: %d tx %p\n", + chan->device->id, __func__, + sw_desc->async_tx.cookie, sw_desc->idx, sw_desc); + + return cookie; +} + +/** + * ppc440spe_adma_prep_dma_interrupt - prepare CDB for a pseudo DMA operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_interrupt( + struct dma_chan *chan, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + int slot_cnt, slots_per_op; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s\n", ppc440spe_chan->device->id, + __func__); + + spin_lock_bh(&ppc440spe_chan->lock); + slot_cnt = slots_per_op = 1; + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + ppc440spe_desc_init_interrupt(group_start, ppc440spe_chan); + group_start->unmap_len = 0; + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_memcpy - prepare CDB for a MEMCPY operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + int slot_cnt, slots_per_op; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + if (unlikely(!len)) + return NULL; + + BUG_ON(len > PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT); + + spin_lock_bh(&ppc440spe_chan->lock); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s len: %u int_en %d\n", + ppc440spe_chan->device->id, __func__, len, + flags & DMA_PREP_INTERRUPT ? 1 : 0); + slot_cnt = slots_per_op = 1; + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + ppc440spe_desc_init_memcpy(group_start, flags); + ppc440spe_adma_set_dest(group_start, dma_dest, 0); + ppc440spe_adma_memcpy_xor_set_src(group_start, dma_src, 0); + ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len); + sw_desc->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_xor - prepare CDB for a XOR operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor( + struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t *dma_src, u32 src_cnt, size_t len, + unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + int slot_cnt, slots_per_op; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + ADMA_LL_DBG(prep_dma_xor_dbg(ppc440spe_chan->device->id, + dma_dest, dma_src, src_cnt)); + if (unlikely(!len)) + return NULL; + BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n", + ppc440spe_chan->device->id, __func__, src_cnt, len, + flags & DMA_PREP_INTERRUPT ? 1 : 0); + + spin_lock_bh(&ppc440spe_chan->lock); + slot_cnt = ppc440spe_chan_xor_slot_count(len, src_cnt, &slots_per_op); + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + ppc440spe_desc_init_xor(group_start, src_cnt, flags); + ppc440spe_adma_set_dest(group_start, dma_dest, 0); + while (src_cnt--) + ppc440spe_adma_memcpy_xor_set_src(group_start, + dma_src[src_cnt], src_cnt); + ppc440spe_desc_set_byte_count(group_start, ppc440spe_chan, len); + sw_desc->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +static inline void +ppc440spe_desc_set_xor_src_cnt(struct ppc440spe_adma_desc_slot *desc, + int src_cnt); +static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor); + +/** + * ppc440spe_adma_init_dma2rxor_slot - + */ +static void ppc440spe_adma_init_dma2rxor_slot( + struct ppc440spe_adma_desc_slot *desc, + dma_addr_t *src, int src_cnt) +{ + int i; + + /* initialize CDB */ + for (i = 0; i < src_cnt; i++) { + ppc440spe_adma_dma2rxor_prep_src(desc, &desc->rxor_cursor, i, + desc->src_cnt, (u32)src[i]); + } +} + +/** + * ppc440spe_dma01_prep_mult - + * for Q operation where destination is also the source + */ +static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_mult( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + struct ppc440spe_adma_desc_slot *sw_desc = NULL; + unsigned long op = 0; + int slot_cnt; + + set_bit(PPC440SPE_DESC_WXOR, &op); + slot_cnt = 2; + + spin_lock_bh(&ppc440spe_chan->lock); + + /* use WXOR, each descriptor occupies one slot */ + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + struct ppc440spe_adma_chan *chan; + struct ppc440spe_adma_desc_slot *iter; + struct dma_cdb *hw_desc; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + set_bits(op, &sw_desc->flags); + sw_desc->src_cnt = src_cnt; + sw_desc->dst_cnt = dst_cnt; + /* First descriptor, zero data in the destination and copy it + * to q page using MULTICAST transfer. + */ + iter = list_first_entry(&sw_desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MULTICAST; + + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, dst[0], 0); + ppc440spe_desc_set_dest_addr(iter, chan, 0, dst[1], 1); + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + src[0]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + + /* + * Second descriptor, multiply data from the q page + * and store the result in real destination. + */ + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = NULL; + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + ppc440spe_desc_set_src_addr(iter, chan, 0, + DMA_CUED_XOR_HB, dst[1]); + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, dst[0], 0); + + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, scf[0]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc; +} + +/** + * ppc440spe_dma01_prep_sum_product - + * Dx = A*(P+Pxy) + B*(Q+Qxy) operation where destination is also + * the source. + */ +static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_sum_product( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + struct ppc440spe_adma_desc_slot *sw_desc = NULL; + unsigned long op = 0; + int slot_cnt; + + set_bit(PPC440SPE_DESC_WXOR, &op); + slot_cnt = 3; + + spin_lock_bh(&ppc440spe_chan->lock); + + /* WXOR, each descriptor occupies one slot */ + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + struct ppc440spe_adma_chan *chan; + struct ppc440spe_adma_desc_slot *iter; + struct dma_cdb *hw_desc; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + set_bits(op, &sw_desc->flags); + sw_desc->src_cnt = src_cnt; + sw_desc->dst_cnt = 1; + /* 1st descriptor, src[1] data to q page and zero destination */ + iter = list_first_entry(&sw_desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MULTICAST; + + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, + *dst, 0); + ppc440spe_desc_set_dest_addr(iter, chan, 0, + ppc440spe_chan->qdest, 1); + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + src[1]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + + /* 2nd descriptor, multiply src[1] data and store the + * result in destination */ + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + /* set 'next' pointer */ + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + ppc440spe_chan->qdest); + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, + *dst, 0); + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, scf[1]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + + /* + * 3rd descriptor, multiply src[0] data and xor it + * with destination + */ + iter = list_first_entry(&iter->chain_node, + struct ppc440spe_adma_desc_slot, + chain_node); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = NULL; + if (flags & DMA_PREP_INTERRUPT) + set_bit(PPC440SPE_DESC_INT, &iter->flags); + else + clear_bit(PPC440SPE_DESC_INT, &iter->flags); + + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, + src[0]); + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, + *dst, 0); + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, scf[0]); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, len); + iter->unmap_len = len; + sw_desc->async_tx.flags = flags; + } + + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc; +} + +static struct ppc440spe_adma_desc_slot *ppc440spe_dma01_prep_pq( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + int slot_cnt; + struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter; + unsigned long op = 0; + unsigned char mult = 1; + + pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n", + __func__, dst_cnt, src_cnt, len); + /* select operations WXOR/RXOR depending on the + * source addresses of operators and the number + * of destinations (RXOR support only Q-parity calculations) + */ + set_bit(PPC440SPE_DESC_WXOR, &op); + if (!test_and_set_bit(PPC440SPE_RXOR_RUN, &ppc440spe_rxor_state)) { + /* no active RXOR; + * do RXOR if: + * - there are more than 1 source, + * - len is aligned on 512-byte boundary, + * - source addresses fit to one of 4 possible regions. + */ + if (src_cnt > 1 && + !(len & MQ0_CF2H_RXOR_BS_MASK) && + (src[0] + len) == src[1]) { + /* may do RXOR R1 R2 */ + set_bit(PPC440SPE_DESC_RXOR, &op); + if (src_cnt != 2) { + /* may try to enhance region of RXOR */ + if ((src[1] + len) == src[2]) { + /* do RXOR R1 R2 R3 */ + set_bit(PPC440SPE_DESC_RXOR123, + &op); + } else if ((src[1] + len * 2) == src[2]) { + /* do RXOR R1 R2 R4 */ + set_bit(PPC440SPE_DESC_RXOR124, &op); + } else if ((src[1] + len * 3) == src[2]) { + /* do RXOR R1 R2 R5 */ + set_bit(PPC440SPE_DESC_RXOR125, + &op); + } else { + /* do RXOR R1 R2 */ + set_bit(PPC440SPE_DESC_RXOR12, + &op); + } + } else { + /* do RXOR R1 R2 */ + set_bit(PPC440SPE_DESC_RXOR12, &op); + } + } + + if (!test_bit(PPC440SPE_DESC_RXOR, &op)) { + /* can not do this operation with RXOR */ + clear_bit(PPC440SPE_RXOR_RUN, + &ppc440spe_rxor_state); + } else { + /* can do; set block size right now */ + ppc440spe_desc_set_rxor_block_size(len); + } + } + + /* Number of necessary slots depends on operation type selected */ + if (!test_bit(PPC440SPE_DESC_RXOR, &op)) { + /* This is a WXOR only chain. Need descriptors for each + * source to GF-XOR them with WXOR, and need descriptors + * for each destination to zero them with WXOR + */ + slot_cnt = src_cnt; + + if (flags & DMA_PREP_ZERO_P) { + slot_cnt++; + set_bit(PPC440SPE_ZERO_P, &op); + } + if (flags & DMA_PREP_ZERO_Q) { + slot_cnt++; + set_bit(PPC440SPE_ZERO_Q, &op); + } + } else { + /* Need 1/2 descriptor for RXOR operation, and + * need (src_cnt - (2 or 3)) for WXOR of sources + * remained (if any) + */ + slot_cnt = dst_cnt; + + if (flags & DMA_PREP_ZERO_P) + set_bit(PPC440SPE_ZERO_P, &op); + if (flags & DMA_PREP_ZERO_Q) + set_bit(PPC440SPE_ZERO_Q, &op); + + if (test_bit(PPC440SPE_DESC_RXOR12, &op)) + slot_cnt += src_cnt - 2; + else + slot_cnt += src_cnt - 3; + + /* Thus we have either RXOR only chain or + * mixed RXOR/WXOR + */ + if (slot_cnt == dst_cnt) + /* RXOR only chain */ + clear_bit(PPC440SPE_DESC_WXOR, &op); + } + + spin_lock_bh(&ppc440spe_chan->lock); + /* for both RXOR/WXOR each descriptor occupies one slot */ + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + ppc440spe_desc_init_dma01pq(sw_desc, dst_cnt, src_cnt, + flags, op); + + /* setup dst/src/mult */ + pr_debug("%s: set dst descriptor 0, 1: 0x%016llx, 0x%016llx\n", + __func__, dst[0], dst[1]); + ppc440spe_adma_pq_set_dest(sw_desc, dst, flags); + while (src_cnt--) { + ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt], + src_cnt); + + /* NOTE: "Multi = 0 is equivalent to = 1" as it + * stated in 440SPSPe_RAID6_Addendum_UM_1_17.pdf + * doesn't work for RXOR with DMA0/1! Instead, multi=0 + * leads to zeroing source data after RXOR. + * So, for P case set-up mult=1 explicitly. + */ + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) + mult = scf[src_cnt]; + ppc440spe_adma_pq_set_src_mult(sw_desc, + mult, src_cnt, dst_cnt - 1); + } + + /* Setup byte count foreach slot just allocated */ + sw_desc->async_tx.flags = flags; + list_for_each_entry(iter, &sw_desc->group_list, + chain_node) { + ppc440spe_desc_set_byte_count(iter, + ppc440spe_chan, len); + iter->unmap_len = len; + } + } + spin_unlock_bh(&ppc440spe_chan->lock); + + return sw_desc; +} + +static struct ppc440spe_adma_desc_slot *ppc440spe_dma2_prep_pq( + struct ppc440spe_adma_chan *ppc440spe_chan, + dma_addr_t *dst, int dst_cnt, dma_addr_t *src, int src_cnt, + const unsigned char *scf, size_t len, unsigned long flags) +{ + int slot_cnt, descs_per_op; + struct ppc440spe_adma_desc_slot *sw_desc = NULL, *iter; + unsigned long op = 0; + unsigned char mult = 1; + + BUG_ON(!dst_cnt); + /*pr_debug("%s: dst_cnt %d, src_cnt %d, len %d\n", + __func__, dst_cnt, src_cnt, len);*/ + + spin_lock_bh(&ppc440spe_chan->lock); + descs_per_op = ppc440spe_dma2_pq_slot_count(src, src_cnt, len); + if (descs_per_op < 0) { + spin_unlock_bh(&ppc440spe_chan->lock); + return NULL; + } + + /* depending on number of sources we have 1 or 2 RXOR chains */ + slot_cnt = descs_per_op * dst_cnt; + + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, 1); + if (sw_desc) { + op = slot_cnt; + sw_desc->async_tx.flags = flags; + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + ppc440spe_desc_init_dma2pq(iter, dst_cnt, src_cnt, + --op ? 0 : flags); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = len; + + ppc440spe_init_rxor_cursor(&(iter->rxor_cursor)); + iter->rxor_cursor.len = len; + iter->descs_per_op = descs_per_op; + } + op = 0; + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + op++; + if (op % descs_per_op == 0) + ppc440spe_adma_init_dma2rxor_slot(iter, src, + src_cnt); + if (likely(!list_is_last(&iter->chain_node, + &sw_desc->group_list))) { + /* set 'next' pointer */ + iter->hw_next = + list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + ppc440spe_xor_set_link(iter, iter->hw_next); + } else { + /* this is the last descriptor. */ + iter->hw_next = NULL; + } + } + + /* fixup head descriptor */ + sw_desc->dst_cnt = dst_cnt; + if (flags & DMA_PREP_ZERO_P) + set_bit(PPC440SPE_ZERO_P, &sw_desc->flags); + if (flags & DMA_PREP_ZERO_Q) + set_bit(PPC440SPE_ZERO_Q, &sw_desc->flags); + + /* setup dst/src/mult */ + ppc440spe_adma_pq_set_dest(sw_desc, dst, flags); + + while (src_cnt--) { + /* handle descriptors (if dst_cnt == 2) inside + * the ppc440spe_adma_pq_set_srcxxx() functions + */ + ppc440spe_adma_pq_set_src(sw_desc, src[src_cnt], + src_cnt); + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) + mult = scf[src_cnt]; + ppc440spe_adma_pq_set_src_mult(sw_desc, + mult, src_cnt, dst_cnt - 1); + } + } + spin_unlock_bh(&ppc440spe_chan->lock); + ppc440spe_desc_set_rxor_block_size(len); + return sw_desc; +} + +/** + * ppc440spe_adma_prep_dma_pq - prepare CDB (group) for a GF-XOR operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pq( + struct dma_chan *chan, dma_addr_t *dst, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, + size_t len, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc = NULL; + int dst_cnt = 0; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + ADMA_LL_DBG(prep_dma_pq_dbg(ppc440spe_chan->device->id, + dst, src, src_cnt)); + BUG_ON(!len); + BUG_ON(len > PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT); + BUG_ON(!src_cnt); + + if (src_cnt == 1 && dst[1] == src[0]) { + dma_addr_t dest[2]; + + /* dst[1] is real destination (Q) */ + dest[0] = dst[1]; + /* this is the page to multicast source data to */ + dest[1] = ppc440spe_chan->qdest; + sw_desc = ppc440spe_dma01_prep_mult(ppc440spe_chan, + dest, 2, src, src_cnt, scf, len, flags); + return sw_desc ? &sw_desc->async_tx : NULL; + } + + if (src_cnt == 2 && dst[1] == src[1]) { + sw_desc = ppc440spe_dma01_prep_sum_product(ppc440spe_chan, + &dst[1], src, 2, scf, len, flags); + return sw_desc ? &sw_desc->async_tx : NULL; + } + + if (!(flags & DMA_PREP_PQ_DISABLE_P)) { + BUG_ON(!dst[0]); + dst_cnt++; + flags |= DMA_PREP_ZERO_P; + } + + if (!(flags & DMA_PREP_PQ_DISABLE_Q)) { + BUG_ON(!dst[1]); + dst_cnt++; + flags |= DMA_PREP_ZERO_Q; + } + + BUG_ON(!dst_cnt); + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s src_cnt: %d len: %u int_en: %d\n", + ppc440spe_chan->device->id, __func__, src_cnt, len, + flags & DMA_PREP_INTERRUPT ? 1 : 0); + + switch (ppc440spe_chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + sw_desc = ppc440spe_dma01_prep_pq(ppc440spe_chan, + dst, dst_cnt, src, src_cnt, scf, + len, flags); + break; + + case PPC440SPE_XOR_ID: + sw_desc = ppc440spe_dma2_prep_pq(ppc440spe_chan, + dst, dst_cnt, src, src_cnt, scf, + len, flags); + break; + } + + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_pqzero_sum - prepare CDB group for + * a PQ_ZERO_SUM operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_pqzero_sum( + struct dma_chan *chan, dma_addr_t *pq, dma_addr_t *src, + unsigned int src_cnt, const unsigned char *scf, size_t len, + enum sum_check_flags *pqres, unsigned long flags) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *sw_desc, *iter; + dma_addr_t pdest, qdest; + int slot_cnt, slots_per_op, idst, dst_cnt; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + + if (flags & DMA_PREP_PQ_DISABLE_P) + pdest = 0; + else + pdest = pq[0]; + + if (flags & DMA_PREP_PQ_DISABLE_Q) + qdest = 0; + else + qdest = pq[1]; + + ADMA_LL_DBG(prep_dma_pqzero_sum_dbg(ppc440spe_chan->device->id, + src, src_cnt, scf)); + + /* Always use WXOR for P/Q calculations (two destinations). + * Need 1 or 2 extra slots to verify results are zero. + */ + idst = dst_cnt = (pdest && qdest) ? 2 : 1; + + /* One additional slot per destination to clone P/Q + * before calculation (we have to preserve destinations). + */ + slot_cnt = src_cnt + dst_cnt * 2; + slots_per_op = 1; + + spin_lock_bh(&ppc440spe_chan->lock); + sw_desc = ppc440spe_adma_alloc_slots(ppc440spe_chan, slot_cnt, + slots_per_op); + if (sw_desc) { + ppc440spe_desc_init_dma01pqzero_sum(sw_desc, dst_cnt, src_cnt); + + /* Setup byte count for each slot just allocated */ + sw_desc->async_tx.flags = flags; + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = len; + } + + if (pdest) { + struct dma_cdb *hw_desc; + struct ppc440spe_adma_chan *chan; + + iter = sw_desc->group_head; + chan = to_ppc440spe_adma_chan(iter->async_tx.chan); + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter->src_cnt = 0; + iter->dst_cnt = 0; + ppc440spe_desc_set_dest_addr(iter, chan, 0, + ppc440spe_chan->pdest, 0); + ppc440spe_desc_set_src_addr(iter, chan, 0, 0, pdest); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = 0; + /* override pdest to preserve original P */ + pdest = ppc440spe_chan->pdest; + } + if (qdest) { + struct dma_cdb *hw_desc; + struct ppc440spe_adma_chan *chan; + + iter = list_first_entry(&sw_desc->group_list, + struct ppc440spe_adma_desc_slot, + chain_node); + chan = to_ppc440spe_adma_chan(iter->async_tx.chan); + + if (pdest) { + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + memset(iter->hw_desc, 0, sizeof(struct dma_cdb)); + iter->hw_next = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + hw_desc = iter->hw_desc; + hw_desc->opc = DMA_CDB_OPC_MV_SG1_SG2; + iter->src_cnt = 0; + iter->dst_cnt = 0; + ppc440spe_desc_set_dest_addr(iter, chan, 0, + ppc440spe_chan->qdest, 0); + ppc440spe_desc_set_src_addr(iter, chan, 0, 0, qdest); + ppc440spe_desc_set_byte_count(iter, ppc440spe_chan, + len); + iter->unmap_len = 0; + /* override qdest to preserve original Q */ + qdest = ppc440spe_chan->qdest; + } + + /* Setup destinations for P/Q ops */ + ppc440spe_adma_pqzero_sum_set_dest(sw_desc, pdest, qdest); + + /* Setup zero QWORDs into DCHECK CDBs */ + idst = dst_cnt; + list_for_each_entry_reverse(iter, &sw_desc->group_list, + chain_node) { + /* + * The last CDB corresponds to Q-parity check, + * the one before last CDB corresponds + * P-parity check + */ + if (idst == DMA_DEST_MAX_NUM) { + if (idst == dst_cnt) { + set_bit(PPC440SPE_DESC_QCHECK, + &iter->flags); + } else { + set_bit(PPC440SPE_DESC_PCHECK, + &iter->flags); + } + } else { + if (qdest) { + set_bit(PPC440SPE_DESC_QCHECK, + &iter->flags); + } else { + set_bit(PPC440SPE_DESC_PCHECK, + &iter->flags); + } + } + iter->xor_check_result = pqres; + + /* + * set it to zero, if check fail then result will + * be updated + */ + *iter->xor_check_result = 0; + ppc440spe_desc_set_dcheck(iter, ppc440spe_chan, + ppc440spe_qword); + + if (!(--dst_cnt)) + break; + } + + /* Setup sources and mults for P/Q ops */ + list_for_each_entry_continue_reverse(iter, &sw_desc->group_list, + chain_node) { + struct ppc440spe_adma_chan *chan; + u32 mult_dst; + + chan = to_ppc440spe_adma_chan(iter->async_tx.chan); + ppc440spe_desc_set_src_addr(iter, chan, 0, + DMA_CUED_XOR_HB, + src[src_cnt - 1]); + if (qdest) { + mult_dst = (dst_cnt - 1) ? DMA_CDB_SG_DST2 : + DMA_CDB_SG_DST1; + ppc440spe_desc_set_src_mult(iter, chan, + DMA_CUED_MULT1_OFF, + mult_dst, + scf[src_cnt - 1]); + } + if (!(--src_cnt)) + break; + } + } + spin_unlock_bh(&ppc440spe_chan->lock); + return sw_desc ? &sw_desc->async_tx : NULL; +} + +/** + * ppc440spe_adma_prep_dma_xor_zero_sum - prepare CDB group for + * XOR ZERO_SUM operation + */ +static struct dma_async_tx_descriptor *ppc440spe_adma_prep_dma_xor_zero_sum( + struct dma_chan *chan, dma_addr_t *src, unsigned int src_cnt, + size_t len, enum sum_check_flags *result, unsigned long flags) +{ + struct dma_async_tx_descriptor *tx; + dma_addr_t pq[2]; + + /* validate P, disable Q */ + pq[0] = src[0]; + pq[1] = 0; + flags |= DMA_PREP_PQ_DISABLE_Q; + + tx = ppc440spe_adma_prep_dma_pqzero_sum(chan, pq, &src[1], + src_cnt - 1, 0, len, + result, flags); + return tx; +} + +/** + * ppc440spe_adma_set_dest - set destination address into descriptor + */ +static void ppc440spe_adma_set_dest(struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t addr, int index) +{ + struct ppc440spe_adma_chan *chan; + + BUG_ON(index >= sw_desc->dst_cnt); + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* to do: support transfers lengths > + * PPC440SPE_ADMA_DMA/XOR_MAX_BYTE_COUNT + */ + ppc440spe_desc_set_dest_addr(sw_desc->group_head, + chan, 0, addr, index); + break; + case PPC440SPE_XOR_ID: + sw_desc = ppc440spe_get_group_entry(sw_desc, index); + ppc440spe_desc_set_dest_addr(sw_desc, + chan, 0, addr, index); + break; + } +} + +static void ppc440spe_adma_pq_zero_op(struct ppc440spe_adma_desc_slot *iter, + struct ppc440spe_adma_chan *chan, dma_addr_t addr) +{ + /* To clear destinations update the descriptor + * (P or Q depending on index) as follows: + * addr is destination (0 corresponds to SG2): + */ + ppc440spe_desc_set_dest_addr(iter, chan, DMA_CUED_XOR_BASE, addr, 0); + + /* ... and the addr is source: */ + ppc440spe_desc_set_src_addr(iter, chan, 0, DMA_CUED_XOR_HB, addr); + + /* addr is always SG2 then the mult is always DST1 */ + ppc440spe_desc_set_src_mult(iter, chan, DMA_CUED_MULT1_OFF, + DMA_CDB_SG_DST1, 1); +} + +/** + * ppc440spe_adma_pq_set_dest - set destination address into descriptor + * for the PQXOR operation + */ +static void ppc440spe_adma_pq_set_dest(struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t *addrs, unsigned long flags) +{ + struct ppc440spe_adma_desc_slot *iter; + struct ppc440spe_adma_chan *chan; + dma_addr_t paddr, qaddr; + dma_addr_t addr = 0, ppath, qpath; + int index = 0, i; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + if (flags & DMA_PREP_PQ_DISABLE_P) + paddr = 0; + else + paddr = addrs[0]; + + if (flags & DMA_PREP_PQ_DISABLE_Q) + qaddr = 0; + else + qaddr = addrs[1]; + + if (!paddr || !qaddr) + addr = paddr ? paddr : qaddr; + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* walk through the WXOR source list and set P/Q-destinations + * for each slot: + */ + if (!test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { + /* This is WXOR-only chain; may have 1/2 zero descs */ + if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) + index++; + if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) + index++; + + iter = ppc440spe_get_group_entry(sw_desc, index); + if (addr) { + /* one destination */ + list_for_each_entry_from(iter, + &sw_desc->group_list, chain_node) + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, addr, 0); + } else { + /* two destinations */ + list_for_each_entry_from(iter, + &sw_desc->group_list, chain_node) { + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, paddr, 0); + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, qaddr, 1); + } + } + + if (index) { + /* To clear destinations update the descriptor + * (1st,2nd, or both depending on flags) + */ + index = 0; + if (test_bit(PPC440SPE_ZERO_P, + &sw_desc->flags)) { + iter = ppc440spe_get_group_entry( + sw_desc, index++); + ppc440spe_adma_pq_zero_op(iter, chan, + paddr); + } + + if (test_bit(PPC440SPE_ZERO_Q, + &sw_desc->flags)) { + iter = ppc440spe_get_group_entry( + sw_desc, index++); + ppc440spe_adma_pq_zero_op(iter, chan, + qaddr); + } + + return; + } + } else { + /* This is RXOR-only or RXOR/WXOR mixed chain */ + + /* If we want to include destination into calculations, + * then make dest addresses cued with mult=1 (XOR). + */ + ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + + /* Setup destination(s) in RXOR slot(s) */ + iter = ppc440spe_get_group_entry(sw_desc, index++); + ppc440spe_desc_set_dest_addr(iter, chan, + paddr ? ppath : qpath, + paddr ? paddr : qaddr, 0); + if (!addr) { + /* two destinations */ + iter = ppc440spe_get_group_entry(sw_desc, + index++); + ppc440spe_desc_set_dest_addr(iter, chan, + qpath, qaddr, 0); + } + + if (test_bit(PPC440SPE_DESC_WXOR, &sw_desc->flags)) { + /* Setup destination(s) in remaining WXOR + * slots + */ + iter = ppc440spe_get_group_entry(sw_desc, + index); + if (addr) { + /* one destination */ + list_for_each_entry_from(iter, + &sw_desc->group_list, + chain_node) + ppc440spe_desc_set_dest_addr( + iter, chan, + DMA_CUED_XOR_BASE, + addr, 0); + + } else { + /* two destinations */ + list_for_each_entry_from(iter, + &sw_desc->group_list, + chain_node) { + ppc440spe_desc_set_dest_addr( + iter, chan, + DMA_CUED_XOR_BASE, + paddr, 0); + ppc440spe_desc_set_dest_addr( + iter, chan, + DMA_CUED_XOR_BASE, + qaddr, 1); + } + } + } + + } + break; + + case PPC440SPE_XOR_ID: + /* DMA2 descriptors have only 1 destination, so there are + * two chains - one for each dest. + * If we want to include destination into calculations, + * then make dest addresses cued with mult=1 (XOR). + */ + ppath = test_bit(PPC440SPE_ZERO_P, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + + qpath = test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags) ? + DMA_CUED_XOR_HB : + DMA_CUED_XOR_BASE | + (1 << DMA_CUED_MULT1_OFF); + + iter = ppc440spe_get_group_entry(sw_desc, 0); + for (i = 0; i < sw_desc->descs_per_op; i++) { + ppc440spe_desc_set_dest_addr(iter, chan, + paddr ? ppath : qpath, + paddr ? paddr : qaddr, 0); + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + if (!addr) { + /* Two destinations; setup Q here */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->descs_per_op); + for (i = 0; i < sw_desc->descs_per_op; i++) { + ppc440spe_desc_set_dest_addr(iter, + chan, qpath, qaddr, 0); + iter = list_entry(iter->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + } + + break; + } +} + +/** + * ppc440spe_adma_pq_zero_sum_set_dest - set destination address into descriptor + * for the PQ_ZERO_SUM operation + */ +static void ppc440spe_adma_pqzero_sum_set_dest( + struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t paddr, dma_addr_t qaddr) +{ + struct ppc440spe_adma_desc_slot *iter, *end; + struct ppc440spe_adma_chan *chan; + dma_addr_t addr = 0; + int idx; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + /* walk through the WXOR source list and set P/Q-destinations + * for each slot + */ + idx = (paddr && qaddr) ? 2 : 1; + /* set end */ + list_for_each_entry_reverse(end, &sw_desc->group_list, + chain_node) { + if (!(--idx)) + break; + } + /* set start */ + idx = (paddr && qaddr) ? 2 : 1; + iter = ppc440spe_get_group_entry(sw_desc, idx); + + if (paddr && qaddr) { + /* two destinations */ + list_for_each_entry_from(iter, &sw_desc->group_list, + chain_node) { + if (unlikely(iter == end)) + break; + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, paddr, 0); + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, qaddr, 1); + } + } else { + /* one destination */ + addr = paddr ? paddr : qaddr; + list_for_each_entry_from(iter, &sw_desc->group_list, + chain_node) { + if (unlikely(iter == end)) + break; + ppc440spe_desc_set_dest_addr(iter, chan, + DMA_CUED_XOR_BASE, addr, 0); + } + } + + /* The remaining descriptors are DATACHECK. These have no need in + * destination. Actually, these destinations are used there + * as sources for check operation. So, set addr as source. + */ + ppc440spe_desc_set_src_addr(end, chan, 0, 0, addr ? addr : paddr); + + if (!addr) { + end = list_entry(end->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + ppc440spe_desc_set_src_addr(end, chan, 0, 0, qaddr); + } +} + +/** + * ppc440spe_desc_set_xor_src_cnt - set source count into descriptor + */ +static inline void ppc440spe_desc_set_xor_src_cnt( + struct ppc440spe_adma_desc_slot *desc, + int src_cnt) +{ + struct xor_cb *hw_desc = desc->hw_desc; + + hw_desc->cbc &= ~XOR_CDCR_OAC_MSK; + hw_desc->cbc |= src_cnt; +} + +/** + * ppc440spe_adma_pq_set_src - set source address into descriptor + */ +static void ppc440spe_adma_pq_set_src(struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t addr, int index) +{ + struct ppc440spe_adma_chan *chan; + dma_addr_t haddr = 0; + struct ppc440spe_adma_desc_slot *iter = NULL; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + /* DMA0,1 may do: WXOR, RXOR, RXOR+WXORs chain + */ + if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { + /* RXOR-only or RXOR/WXOR operation */ + int iskip = test_bit(PPC440SPE_DESC_RXOR12, + &sw_desc->flags) ? 2 : 3; + + if (index == 0) { + /* 1st slot (RXOR) */ + /* setup sources region (R1-2-3, R1-2-4, + * or R1-2-5) + */ + if (test_bit(PPC440SPE_DESC_RXOR12, + &sw_desc->flags)) + haddr = DMA_RXOR12 << + DMA_CUED_REGION_OFF; + else if (test_bit(PPC440SPE_DESC_RXOR123, + &sw_desc->flags)) + haddr = DMA_RXOR123 << + DMA_CUED_REGION_OFF; + else if (test_bit(PPC440SPE_DESC_RXOR124, + &sw_desc->flags)) + haddr = DMA_RXOR124 << + DMA_CUED_REGION_OFF; + else if (test_bit(PPC440SPE_DESC_RXOR125, + &sw_desc->flags)) + haddr = DMA_RXOR125 << + DMA_CUED_REGION_OFF; + else + BUG(); + haddr |= DMA_CUED_XOR_BASE; + iter = ppc440spe_get_group_entry(sw_desc, 0); + } else if (index < iskip) { + /* 1st slot (RXOR) + * shall actually set source address only once + * instead of first <iskip> + */ + iter = NULL; + } else { + /* 2nd/3d and next slots (WXOR); + * skip first slot with RXOR + */ + haddr = DMA_CUED_XOR_HB; + iter = ppc440spe_get_group_entry(sw_desc, + index - iskip + sw_desc->dst_cnt); + } + } else { + int znum = 0; + + /* WXOR-only operation; skip first slots with + * zeroing destinations + */ + if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) + znum++; + if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) + znum++; + + haddr = DMA_CUED_XOR_HB; + iter = ppc440spe_get_group_entry(sw_desc, + index + znum); + } + + if (likely(iter)) { + ppc440spe_desc_set_src_addr(iter, chan, 0, haddr, addr); + + if (!index && + test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags) && + sw_desc->dst_cnt == 2) { + /* if we have two destinations for RXOR, then + * setup source in the second descr too + */ + iter = ppc440spe_get_group_entry(sw_desc, 1); + ppc440spe_desc_set_src_addr(iter, chan, 0, + haddr, addr); + } + } + break; + + case PPC440SPE_XOR_ID: + /* DMA2 may do Biskup */ + iter = sw_desc->group_head; + if (iter->dst_cnt == 2) { + /* both P & Q calculations required; set P src here */ + ppc440spe_adma_dma2rxor_set_src(iter, index, addr); + + /* this is for Q */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->descs_per_op); + } + ppc440spe_adma_dma2rxor_set_src(iter, index, addr); + break; + } +} + +/** + * ppc440spe_adma_memcpy_xor_set_src - set source address into descriptor + */ +static void ppc440spe_adma_memcpy_xor_set_src( + struct ppc440spe_adma_desc_slot *sw_desc, + dma_addr_t addr, int index) +{ + struct ppc440spe_adma_chan *chan; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + sw_desc = sw_desc->group_head; + + if (likely(sw_desc)) + ppc440spe_desc_set_src_addr(sw_desc, chan, index, 0, addr); +} + +/** + * ppc440spe_adma_dma2rxor_inc_addr - + */ +static void ppc440spe_adma_dma2rxor_inc_addr( + struct ppc440spe_adma_desc_slot *desc, + struct ppc440spe_rxor *cursor, int index, int src_cnt) +{ + cursor->addr_count++; + if (index == src_cnt - 1) { + ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count); + } else if (cursor->addr_count == XOR_MAX_OPS) { + ppc440spe_desc_set_xor_src_cnt(desc, cursor->addr_count); + cursor->addr_count = 0; + cursor->desc_count++; + } +} + +/** + * ppc440spe_adma_dma2rxor_prep_src - setup RXOR types in DMA2 CDB + */ +static int ppc440spe_adma_dma2rxor_prep_src( + struct ppc440spe_adma_desc_slot *hdesc, + struct ppc440spe_rxor *cursor, int index, + int src_cnt, u32 addr) +{ + int rval = 0; + u32 sign; + struct ppc440spe_adma_desc_slot *desc = hdesc; + int i; + + for (i = 0; i < cursor->desc_count; i++) { + desc = list_entry(hdesc->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + } + + switch (cursor->state) { + case 0: + if (addr == cursor->addrl + cursor->len) { + /* direct RXOR */ + cursor->state = 1; + cursor->xor_count++; + if (index == src_cnt-1) { + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else if (cursor->addrl == addr + cursor->len) { + /* reverse RXOR */ + cursor->state = 1; + cursor->xor_count++; + set_bit(cursor->addr_count, &desc->reverse_flags[0]); + if (index == src_cnt-1) { + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else { + printk(KERN_ERR "Cannot build " + "DMA2 RXOR command block.\n"); + BUG(); + } + break; + case 1: + sign = test_bit(cursor->addr_count, + desc->reverse_flags) + ? -1 : 1; + if (index == src_cnt-2 || (sign == -1 + && addr != cursor->addrl - 2*cursor->len)) { + cursor->state = 0; + cursor->xor_count = 1; + cursor->addrl = addr; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } else if (addr == cursor->addrl + 2*sign*cursor->len) { + cursor->state = 2; + cursor->xor_count = 0; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR123 << DMA_CUED_REGION_OFF); + if (index == src_cnt-1) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else if (addr == cursor->addrl + 3*cursor->len) { + cursor->state = 2; + cursor->xor_count = 0; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR124 << DMA_CUED_REGION_OFF); + if (index == src_cnt-1) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else if (addr == cursor->addrl + 4*cursor->len) { + cursor->state = 2; + cursor->xor_count = 0; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR125 << DMA_CUED_REGION_OFF); + if (index == src_cnt-1) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + } else { + cursor->state = 0; + cursor->xor_count = 1; + cursor->addrl = addr; + ppc440spe_rxor_set_region(desc, + cursor->addr_count, + DMA_RXOR12 << DMA_CUED_REGION_OFF); + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + break; + case 2: + cursor->state = 0; + cursor->addrl = addr; + cursor->xor_count++; + if (index) { + ppc440spe_adma_dma2rxor_inc_addr( + desc, cursor, index, src_cnt); + } + break; + } + + return rval; +} + +/** + * ppc440spe_adma_dma2rxor_set_src - set RXOR source address; it's assumed that + * ppc440spe_adma_dma2rxor_prep_src() has already done prior this call + */ +static void ppc440spe_adma_dma2rxor_set_src( + struct ppc440spe_adma_desc_slot *desc, + int index, dma_addr_t addr) +{ + struct xor_cb *xcb = desc->hw_desc; + int k = 0, op = 0, lop = 0; + + /* get the RXOR operand which corresponds to index addr */ + while (op <= index) { + lop = op; + if (k == XOR_MAX_OPS) { + k = 0; + desc = list_entry(desc->chain_node.next, + struct ppc440spe_adma_desc_slot, chain_node); + xcb = desc->hw_desc; + + } + if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) == + (DMA_RXOR12 << DMA_CUED_REGION_OFF)) + op += 2; + else + op += 3; + } + + BUG_ON(k < 1); + + if (test_bit(k-1, desc->reverse_flags)) { + /* reverse operand order; put last op in RXOR group */ + if (index == op - 1) + ppc440spe_rxor_set_src(desc, k - 1, addr); + } else { + /* direct operand order; put first op in RXOR group */ + if (index == lop) + ppc440spe_rxor_set_src(desc, k - 1, addr); + } +} + +/** + * ppc440spe_adma_dma2rxor_set_mult - set RXOR multipliers; it's assumed that + * ppc440spe_adma_dma2rxor_prep_src() has already done prior this call + */ +static void ppc440spe_adma_dma2rxor_set_mult( + struct ppc440spe_adma_desc_slot *desc, + int index, u8 mult) +{ + struct xor_cb *xcb = desc->hw_desc; + int k = 0, op = 0, lop = 0; + + /* get the RXOR operand which corresponds to index mult */ + while (op <= index) { + lop = op; + if (k == XOR_MAX_OPS) { + k = 0; + desc = list_entry(desc->chain_node.next, + struct ppc440spe_adma_desc_slot, + chain_node); + xcb = desc->hw_desc; + + } + if ((xcb->ops[k++].h & (DMA_RXOR12 << DMA_CUED_REGION_OFF)) == + (DMA_RXOR12 << DMA_CUED_REGION_OFF)) + op += 2; + else + op += 3; + } + + BUG_ON(k < 1); + if (test_bit(k-1, desc->reverse_flags)) { + /* reverse order */ + ppc440spe_rxor_set_mult(desc, k - 1, op - index - 1, mult); + } else { + /* direct order */ + ppc440spe_rxor_set_mult(desc, k - 1, index - lop, mult); + } +} + +/** + * ppc440spe_init_rxor_cursor - + */ +static void ppc440spe_init_rxor_cursor(struct ppc440spe_rxor *cursor) +{ + memset(cursor, 0, sizeof(struct ppc440spe_rxor)); + cursor->state = 2; +} + +/** + * ppc440spe_adma_pq_set_src_mult - set multiplication coefficient into + * descriptor for the PQXOR operation + */ +static void ppc440spe_adma_pq_set_src_mult( + struct ppc440spe_adma_desc_slot *sw_desc, + unsigned char mult, int index, int dst_pos) +{ + struct ppc440spe_adma_chan *chan; + u32 mult_idx, mult_dst; + struct ppc440spe_adma_desc_slot *iter = NULL, *iter1 = NULL; + + chan = to_ppc440spe_adma_chan(sw_desc->async_tx.chan); + + switch (chan->device->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + if (test_bit(PPC440SPE_DESC_RXOR, &sw_desc->flags)) { + int region = test_bit(PPC440SPE_DESC_RXOR12, + &sw_desc->flags) ? 2 : 3; + + if (index < region) { + /* RXOR multipliers */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->dst_cnt - 1); + if (sw_desc->dst_cnt == 2) + iter1 = ppc440spe_get_group_entry( + sw_desc, 0); + + mult_idx = DMA_CUED_MULT1_OFF + (index << 3); + mult_dst = DMA_CDB_SG_SRC; + } else { + /* WXOR multiplier */ + iter = ppc440spe_get_group_entry(sw_desc, + index - region + + sw_desc->dst_cnt); + mult_idx = DMA_CUED_MULT1_OFF; + mult_dst = dst_pos ? DMA_CDB_SG_DST2 : + DMA_CDB_SG_DST1; + } + } else { + int znum = 0; + + /* WXOR-only; + * skip first slots with destinations (if ZERO_DST has + * place) + */ + if (test_bit(PPC440SPE_ZERO_P, &sw_desc->flags)) + znum++; + if (test_bit(PPC440SPE_ZERO_Q, &sw_desc->flags)) + znum++; + + iter = ppc440spe_get_group_entry(sw_desc, index + znum); + mult_idx = DMA_CUED_MULT1_OFF; + mult_dst = dst_pos ? DMA_CDB_SG_DST2 : DMA_CDB_SG_DST1; + } + + if (likely(iter)) { + ppc440spe_desc_set_src_mult(iter, chan, + mult_idx, mult_dst, mult); + + if (unlikely(iter1)) { + /* if we have two destinations for RXOR, then + * we've just set Q mult. Set-up P now. + */ + ppc440spe_desc_set_src_mult(iter1, chan, + mult_idx, mult_dst, 1); + } + + } + break; + + case PPC440SPE_XOR_ID: + iter = sw_desc->group_head; + if (sw_desc->dst_cnt == 2) { + /* both P & Q calculations required; set P mult here */ + ppc440spe_adma_dma2rxor_set_mult(iter, index, 1); + + /* and then set Q mult */ + iter = ppc440spe_get_group_entry(sw_desc, + sw_desc->descs_per_op); + } + ppc440spe_adma_dma2rxor_set_mult(iter, index, mult); + break; + } +} + +/** + * ppc440spe_adma_free_chan_resources - free the resources allocated + */ +static void ppc440spe_adma_free_chan_resources(struct dma_chan *chan) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + struct ppc440spe_adma_desc_slot *iter, *_iter; + int in_use_descs = 0; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + ppc440spe_adma_slot_cleanup(ppc440spe_chan); + + spin_lock_bh(&ppc440spe_chan->lock); + list_for_each_entry_safe(iter, _iter, &ppc440spe_chan->chain, + chain_node) { + in_use_descs++; + list_del(&iter->chain_node); + } + list_for_each_entry_safe_reverse(iter, _iter, + &ppc440spe_chan->all_slots, slot_node) { + list_del(&iter->slot_node); + kfree(iter); + ppc440spe_chan->slots_allocated--; + } + ppc440spe_chan->last_used = NULL; + + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d %s slots_allocated %d\n", + ppc440spe_chan->device->id, + __func__, ppc440spe_chan->slots_allocated); + spin_unlock_bh(&ppc440spe_chan->lock); + + /* one is ok since we left it on there on purpose */ + if (in_use_descs > 1) + printk(KERN_ERR "SPE: Freeing %d in use descriptors!\n", + in_use_descs - 1); +} + +/** + * ppc440spe_adma_tx_status - poll the status of an ADMA transaction + * @chan: ADMA channel handle + * @cookie: ADMA transaction identifier + * @txstate: a holder for the current state of the channel + */ +static enum dma_status ppc440spe_adma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + enum dma_status ret; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + ppc440spe_adma_slot_cleanup(ppc440spe_chan); + + return dma_cookie_status(chan, cookie, txstate); +} + +/** + * ppc440spe_adma_eot_handler - end of transfer interrupt handler + */ +static irqreturn_t ppc440spe_adma_eot_handler(int irq, void *data) +{ + struct ppc440spe_adma_chan *chan = data; + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s\n", chan->device->id, __func__); + + tasklet_schedule(&chan->irq_tasklet); + ppc440spe_adma_device_clear_eot_status(chan); + + return IRQ_HANDLED; +} + +/** + * ppc440spe_adma_err_handler - DMA error interrupt handler; + * do the same things as a eot handler + */ +static irqreturn_t ppc440spe_adma_err_handler(int irq, void *data) +{ + struct ppc440spe_adma_chan *chan = data; + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s\n", chan->device->id, __func__); + + tasklet_schedule(&chan->irq_tasklet); + ppc440spe_adma_device_clear_eot_status(chan); + + return IRQ_HANDLED; +} + +/** + * ppc440spe_test_callback - called when test operation has been done + */ +static void ppc440spe_test_callback(void *unused) +{ + complete(&ppc440spe_r6_test_comp); +} + +/** + * ppc440spe_adma_issue_pending - flush all pending descriptors to h/w + */ +static void ppc440spe_adma_issue_pending(struct dma_chan *chan) +{ + struct ppc440spe_adma_chan *ppc440spe_chan; + + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + dev_dbg(ppc440spe_chan->device->common.dev, + "ppc440spe adma%d: %s %d \n", ppc440spe_chan->device->id, + __func__, ppc440spe_chan->pending); + + if (ppc440spe_chan->pending) { + ppc440spe_chan->pending = 0; + ppc440spe_chan_append(ppc440spe_chan); + } +} + +/** + * ppc440spe_chan_start_null_xor - initiate the first XOR operation (DMA engines + * use FIFOs (as opposite to chains used in XOR) so this is a XOR + * specific operation) + */ +static void ppc440spe_chan_start_null_xor(struct ppc440spe_adma_chan *chan) +{ + struct ppc440spe_adma_desc_slot *sw_desc, *group_start; + dma_cookie_t cookie; + int slot_cnt, slots_per_op; + + dev_dbg(chan->device->common.dev, + "ppc440spe adma%d: %s\n", chan->device->id, __func__); + + spin_lock_bh(&chan->lock); + slot_cnt = ppc440spe_chan_xor_slot_count(0, 2, &slots_per_op); + sw_desc = ppc440spe_adma_alloc_slots(chan, slot_cnt, slots_per_op); + if (sw_desc) { + group_start = sw_desc->group_head; + list_splice_init(&sw_desc->group_list, &chan->chain); + async_tx_ack(&sw_desc->async_tx); + ppc440spe_desc_init_null_xor(group_start); + + cookie = dma_cookie_assign(&sw_desc->async_tx); + + /* initialize the completed cookie to be less than + * the most recently used cookie + */ + chan->common.completed_cookie = cookie - 1; + + /* channel should not be busy */ + BUG_ON(ppc440spe_chan_is_busy(chan)); + + /* set the descriptor address */ + ppc440spe_chan_set_first_xor_descriptor(chan, sw_desc); + + /* run the descriptor */ + ppc440spe_chan_run(chan); + } else + printk(KERN_ERR "ppc440spe adma%d" + " failed to allocate null descriptor\n", + chan->device->id); + spin_unlock_bh(&chan->lock); +} + +/** + * ppc440spe_test_raid6 - test are RAID-6 capabilities enabled successfully. + * For this we just perform one WXOR operation with the same source + * and destination addresses, the GF-multiplier is 1; so if RAID-6 + * capabilities are enabled then we'll get src/dst filled with zero. + */ +static int ppc440spe_test_raid6(struct ppc440spe_adma_chan *chan) +{ + struct ppc440spe_adma_desc_slot *sw_desc, *iter; + struct page *pg; + char *a; + dma_addr_t dma_addr, addrs[2]; + unsigned long op = 0; + int rval = 0; + + set_bit(PPC440SPE_DESC_WXOR, &op); + + pg = alloc_page(GFP_KERNEL); + if (!pg) + return -ENOMEM; + + spin_lock_bh(&chan->lock); + sw_desc = ppc440spe_adma_alloc_slots(chan, 1, 1); + if (sw_desc) { + /* 1 src, 1 dsr, int_ena, WXOR */ + ppc440spe_desc_init_dma01pq(sw_desc, 1, 1, 1, op); + list_for_each_entry(iter, &sw_desc->group_list, chain_node) { + ppc440spe_desc_set_byte_count(iter, chan, PAGE_SIZE); + iter->unmap_len = PAGE_SIZE; + } + } else { + rval = -EFAULT; + spin_unlock_bh(&chan->lock); + goto exit; + } + spin_unlock_bh(&chan->lock); + + /* Fill the test page with ones */ + memset(page_address(pg), 0xFF, PAGE_SIZE); + dma_addr = dma_map_page(chan->device->dev, pg, 0, + PAGE_SIZE, DMA_BIDIRECTIONAL); + + /* Setup addresses */ + ppc440spe_adma_pq_set_src(sw_desc, dma_addr, 0); + ppc440spe_adma_pq_set_src_mult(sw_desc, 1, 0, 0); + addrs[0] = dma_addr; + addrs[1] = 0; + ppc440spe_adma_pq_set_dest(sw_desc, addrs, DMA_PREP_PQ_DISABLE_Q); + + async_tx_ack(&sw_desc->async_tx); + sw_desc->async_tx.callback = ppc440spe_test_callback; + sw_desc->async_tx.callback_param = NULL; + + init_completion(&ppc440spe_r6_test_comp); + + ppc440spe_adma_tx_submit(&sw_desc->async_tx); + ppc440spe_adma_issue_pending(&chan->common); + + wait_for_completion(&ppc440spe_r6_test_comp); + + /* Now check if the test page is zeroed */ + a = page_address(pg); + if ((*(u32 *)a) == 0 && memcmp(a, a+4, PAGE_SIZE-4) == 0) { + /* page is zero - RAID-6 enabled */ + rval = 0; + } else { + /* RAID-6 was not enabled */ + rval = -EINVAL; + } +exit: + __free_page(pg); + return rval; +} + +static void ppc440spe_adma_init_capabilities(struct ppc440spe_adma_device *adev) +{ + switch (adev->id) { + case PPC440SPE_DMA0_ID: + case PPC440SPE_DMA1_ID: + dma_cap_set(DMA_MEMCPY, adev->common.cap_mask); + dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask); + dma_cap_set(DMA_PQ, adev->common.cap_mask); + dma_cap_set(DMA_PQ_VAL, adev->common.cap_mask); + dma_cap_set(DMA_XOR_VAL, adev->common.cap_mask); + break; + case PPC440SPE_XOR_ID: + dma_cap_set(DMA_XOR, adev->common.cap_mask); + dma_cap_set(DMA_PQ, adev->common.cap_mask); + dma_cap_set(DMA_INTERRUPT, adev->common.cap_mask); + adev->common.cap_mask = adev->common.cap_mask; + break; + } + + /* Set base routines */ + adev->common.device_alloc_chan_resources = + ppc440spe_adma_alloc_chan_resources; + adev->common.device_free_chan_resources = + ppc440spe_adma_free_chan_resources; + adev->common.device_tx_status = ppc440spe_adma_tx_status; + adev->common.device_issue_pending = ppc440spe_adma_issue_pending; + + /* Set prep routines based on capability */ + if (dma_has_cap(DMA_MEMCPY, adev->common.cap_mask)) { + adev->common.device_prep_dma_memcpy = + ppc440spe_adma_prep_dma_memcpy; + } + if (dma_has_cap(DMA_XOR, adev->common.cap_mask)) { + adev->common.max_xor = XOR_MAX_OPS; + adev->common.device_prep_dma_xor = + ppc440spe_adma_prep_dma_xor; + } + if (dma_has_cap(DMA_PQ, adev->common.cap_mask)) { + switch (adev->id) { + case PPC440SPE_DMA0_ID: + dma_set_maxpq(&adev->common, + DMA0_FIFO_SIZE / sizeof(struct dma_cdb), 0); + break; + case PPC440SPE_DMA1_ID: + dma_set_maxpq(&adev->common, + DMA1_FIFO_SIZE / sizeof(struct dma_cdb), 0); + break; + case PPC440SPE_XOR_ID: + adev->common.max_pq = XOR_MAX_OPS * 3; + break; + } + adev->common.device_prep_dma_pq = + ppc440spe_adma_prep_dma_pq; + } + if (dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask)) { + switch (adev->id) { + case PPC440SPE_DMA0_ID: + adev->common.max_pq = DMA0_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + case PPC440SPE_DMA1_ID: + adev->common.max_pq = DMA1_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + } + adev->common.device_prep_dma_pq_val = + ppc440spe_adma_prep_dma_pqzero_sum; + } + if (dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask)) { + switch (adev->id) { + case PPC440SPE_DMA0_ID: + adev->common.max_xor = DMA0_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + case PPC440SPE_DMA1_ID: + adev->common.max_xor = DMA1_FIFO_SIZE / + sizeof(struct dma_cdb); + break; + } + adev->common.device_prep_dma_xor_val = + ppc440spe_adma_prep_dma_xor_zero_sum; + } + if (dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask)) { + adev->common.device_prep_dma_interrupt = + ppc440spe_adma_prep_dma_interrupt; + } + pr_info("%s: AMCC(R) PPC440SP(E) ADMA Engine: " + "( %s%s%s%s%s%s)\n", + dev_name(adev->dev), + dma_has_cap(DMA_PQ, adev->common.cap_mask) ? "pq " : "", + dma_has_cap(DMA_PQ_VAL, adev->common.cap_mask) ? "pq_val " : "", + dma_has_cap(DMA_XOR, adev->common.cap_mask) ? "xor " : "", + dma_has_cap(DMA_XOR_VAL, adev->common.cap_mask) ? "xor_val " : "", + dma_has_cap(DMA_MEMCPY, adev->common.cap_mask) ? "memcpy " : "", + dma_has_cap(DMA_INTERRUPT, adev->common.cap_mask) ? "intr " : ""); +} + +static int ppc440spe_adma_setup_irqs(struct ppc440spe_adma_device *adev, + struct ppc440spe_adma_chan *chan, + int *initcode) +{ + struct platform_device *ofdev; + struct device_node *np; + int ret; + + ofdev = container_of(adev->dev, struct platform_device, dev); + np = ofdev->dev.of_node; + if (adev->id != PPC440SPE_XOR_ID) { + adev->err_irq = irq_of_parse_and_map(np, 1); + if (adev->err_irq == NO_IRQ) { + dev_warn(adev->dev, "no err irq resource?\n"); + *initcode = PPC_ADMA_INIT_IRQ2; + adev->err_irq = -ENXIO; + } else + atomic_inc(&ppc440spe_adma_err_irq_ref); + } else { + adev->err_irq = -ENXIO; + } + + adev->irq = irq_of_parse_and_map(np, 0); + if (adev->irq == NO_IRQ) { + dev_err(adev->dev, "no irq resource\n"); + *initcode = PPC_ADMA_INIT_IRQ1; + ret = -ENXIO; + goto err_irq_map; + } + dev_dbg(adev->dev, "irq %d, err irq %d\n", + adev->irq, adev->err_irq); + + ret = request_irq(adev->irq, ppc440spe_adma_eot_handler, + 0, dev_driver_string(adev->dev), chan); + if (ret) { + dev_err(adev->dev, "can't request irq %d\n", + adev->irq); + *initcode = PPC_ADMA_INIT_IRQ1; + ret = -EIO; + goto err_req1; + } + + /* only DMA engines have a separate error IRQ + * so it's Ok if err_irq < 0 in XOR engine case. + */ + if (adev->err_irq > 0) { + /* both DMA engines share common error IRQ */ + ret = request_irq(adev->err_irq, + ppc440spe_adma_err_handler, + IRQF_SHARED, + dev_driver_string(adev->dev), + chan); + if (ret) { + dev_err(adev->dev, "can't request irq %d\n", + adev->err_irq); + *initcode = PPC_ADMA_INIT_IRQ2; + ret = -EIO; + goto err_req2; + } + } + + if (adev->id == PPC440SPE_XOR_ID) { + /* enable XOR engine interrupts */ + iowrite32be(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT | + XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT, + &adev->xor_reg->ier); + } else { + u32 mask, enable; + + np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe"); + if (!np) { + pr_err("%s: can't find I2O device tree node\n", + __func__); + ret = -ENODEV; + goto err_req2; + } + adev->i2o_reg = of_iomap(np, 0); + if (!adev->i2o_reg) { + pr_err("%s: failed to map I2O registers\n", __func__); + of_node_put(np); + ret = -EINVAL; + goto err_req2; + } + of_node_put(np); + /* Unmask 'CS FIFO Attention' interrupts and + * enable generating interrupts on errors + */ + enable = (adev->id == PPC440SPE_DMA0_ID) ? + ~(I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) : + ~(I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM); + mask = ioread32(&adev->i2o_reg->iopim) & enable; + iowrite32(mask, &adev->i2o_reg->iopim); + } + return 0; + +err_req2: + free_irq(adev->irq, chan); +err_req1: + irq_dispose_mapping(adev->irq); +err_irq_map: + if (adev->err_irq > 0) { + if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) + irq_dispose_mapping(adev->err_irq); + } + return ret; +} + +static void ppc440spe_adma_release_irqs(struct ppc440spe_adma_device *adev, + struct ppc440spe_adma_chan *chan) +{ + u32 mask, disable; + + if (adev->id == PPC440SPE_XOR_ID) { + /* disable XOR engine interrupts */ + mask = ioread32be(&adev->xor_reg->ier); + mask &= ~(XOR_IE_CBCIE_BIT | XOR_IE_ICBIE_BIT | + XOR_IE_ICIE_BIT | XOR_IE_RPTIE_BIT); + iowrite32be(mask, &adev->xor_reg->ier); + } else { + /* disable DMAx engine interrupts */ + disable = (adev->id == PPC440SPE_DMA0_ID) ? + (I2O_IOPIM_P0SNE | I2O_IOPIM_P0EM) : + (I2O_IOPIM_P1SNE | I2O_IOPIM_P1EM); + mask = ioread32(&adev->i2o_reg->iopim) | disable; + iowrite32(mask, &adev->i2o_reg->iopim); + } + free_irq(adev->irq, chan); + irq_dispose_mapping(adev->irq); + if (adev->err_irq > 0) { + free_irq(adev->err_irq, chan); + if (atomic_dec_and_test(&ppc440spe_adma_err_irq_ref)) { + irq_dispose_mapping(adev->err_irq); + iounmap(adev->i2o_reg); + } + } +} + +/** + * ppc440spe_adma_probe - probe the asynch device + */ +static int ppc440spe_adma_probe(struct platform_device *ofdev) +{ + struct device_node *np = ofdev->dev.of_node; + struct resource res; + struct ppc440spe_adma_device *adev; + struct ppc440spe_adma_chan *chan; + struct ppc_dma_chan_ref *ref, *_ref; + int ret = 0, initcode = PPC_ADMA_INIT_OK; + const u32 *idx; + int len; + void *regs; + u32 id, pool_size; + + if (of_device_is_compatible(np, "amcc,xor-accelerator")) { + id = PPC440SPE_XOR_ID; + /* As far as the XOR engine is concerned, it does not + * use FIFOs but uses linked list. So there is no dependency + * between pool size to allocate and the engine configuration. + */ + pool_size = PAGE_SIZE << 1; + } else { + /* it is DMA0 or DMA1 */ + idx = of_get_property(np, "cell-index", &len); + if (!idx || (len != sizeof(u32))) { + dev_err(&ofdev->dev, "Device node %s has missing " + "or invalid cell-index property\n", + np->full_name); + return -EINVAL; + } + id = *idx; + /* DMA0,1 engines use FIFO to maintain CDBs, so we + * should allocate the pool accordingly to size of this + * FIFO. Thus, the pool size depends on the FIFO depth: + * how much CDBs pointers the FIFO may contain then so + * much CDBs we should provide in the pool. + * That is + * CDB size = 32B; + * CDBs number = (DMA0_FIFO_SIZE >> 3); + * Pool size = CDBs number * CDB size = + * = (DMA0_FIFO_SIZE >> 3) << 5 = DMA0_FIFO_SIZE << 2. + */ + pool_size = (id == PPC440SPE_DMA0_ID) ? + DMA0_FIFO_SIZE : DMA1_FIFO_SIZE; + pool_size <<= 2; + } + + if (of_address_to_resource(np, 0, &res)) { + dev_err(&ofdev->dev, "failed to get memory resource\n"); + initcode = PPC_ADMA_INIT_MEMRES; + ret = -ENODEV; + goto out; + } + + if (!request_mem_region(res.start, resource_size(&res), + dev_driver_string(&ofdev->dev))) { + dev_err(&ofdev->dev, "failed to request memory region %pR\n", + &res); + initcode = PPC_ADMA_INIT_MEMREG; + ret = -EBUSY; + goto out; + } + + /* create a device */ + adev = kzalloc(sizeof(*adev), GFP_KERNEL); + if (!adev) { + dev_err(&ofdev->dev, "failed to allocate device\n"); + initcode = PPC_ADMA_INIT_ALLOC; + ret = -ENOMEM; + goto err_adev_alloc; + } + + adev->id = id; + adev->pool_size = pool_size; + /* allocate coherent memory for hardware descriptors */ + adev->dma_desc_pool_virt = dma_alloc_coherent(&ofdev->dev, + adev->pool_size, &adev->dma_desc_pool, + GFP_KERNEL); + if (adev->dma_desc_pool_virt == NULL) { + dev_err(&ofdev->dev, "failed to allocate %d bytes of coherent " + "memory for hardware descriptors\n", + adev->pool_size); + initcode = PPC_ADMA_INIT_COHERENT; + ret = -ENOMEM; + goto err_dma_alloc; + } + dev_dbg(&ofdev->dev, "allocated descriptor pool virt 0x%p phys 0x%llx\n", + adev->dma_desc_pool_virt, (u64)adev->dma_desc_pool); + + regs = ioremap(res.start, resource_size(&res)); + if (!regs) { + dev_err(&ofdev->dev, "failed to ioremap regs!\n"); + ret = -ENOMEM; + goto err_regs_alloc; + } + + if (adev->id == PPC440SPE_XOR_ID) { + adev->xor_reg = regs; + /* Reset XOR */ + iowrite32be(XOR_CRSR_XASR_BIT, &adev->xor_reg->crsr); + iowrite32be(XOR_CRSR_64BA_BIT, &adev->xor_reg->crrr); + } else { + size_t fifo_size = (adev->id == PPC440SPE_DMA0_ID) ? + DMA0_FIFO_SIZE : DMA1_FIFO_SIZE; + adev->dma_reg = regs; + /* DMAx_FIFO_SIZE is defined in bytes, + * <fsiz> - is defined in number of CDB pointers (8byte). + * DMA FIFO Length = CSlength + CPlength, where + * CSlength = CPlength = (fsiz + 1) * 8. + */ + iowrite32(DMA_FIFO_ENABLE | ((fifo_size >> 3) - 2), + &adev->dma_reg->fsiz); + /* Configure DMA engine */ + iowrite32(DMA_CFG_DXEPR_HP | DMA_CFG_DFMPP_HP | DMA_CFG_FALGN, + &adev->dma_reg->cfg); + /* Clear Status */ + iowrite32(~0, &adev->dma_reg->dsts); + } + + adev->dev = &ofdev->dev; + adev->common.dev = &ofdev->dev; + INIT_LIST_HEAD(&adev->common.channels); + platform_set_drvdata(ofdev, adev); + + /* create a channel */ + chan = kzalloc(sizeof(*chan), GFP_KERNEL); + if (!chan) { + dev_err(&ofdev->dev, "can't allocate channel structure\n"); + initcode = PPC_ADMA_INIT_CHANNEL; + ret = -ENOMEM; + goto err_chan_alloc; + } + + spin_lock_init(&chan->lock); + INIT_LIST_HEAD(&chan->chain); + INIT_LIST_HEAD(&chan->all_slots); + chan->device = adev; + chan->common.device = &adev->common; + dma_cookie_init(&chan->common); + list_add_tail(&chan->common.device_node, &adev->common.channels); + tasklet_init(&chan->irq_tasklet, ppc440spe_adma_tasklet, + (unsigned long)chan); + + /* allocate and map helper pages for async validation or + * async_mult/async_sum_product operations on DMA0/1. + */ + if (adev->id != PPC440SPE_XOR_ID) { + chan->pdest_page = alloc_page(GFP_KERNEL); + chan->qdest_page = alloc_page(GFP_KERNEL); + if (!chan->pdest_page || + !chan->qdest_page) { + if (chan->pdest_page) + __free_page(chan->pdest_page); + if (chan->qdest_page) + __free_page(chan->qdest_page); + ret = -ENOMEM; + goto err_page_alloc; + } + chan->pdest = dma_map_page(&ofdev->dev, chan->pdest_page, 0, + PAGE_SIZE, DMA_BIDIRECTIONAL); + chan->qdest = dma_map_page(&ofdev->dev, chan->qdest_page, 0, + PAGE_SIZE, DMA_BIDIRECTIONAL); + } + + ref = kmalloc(sizeof(*ref), GFP_KERNEL); + if (ref) { + ref->chan = &chan->common; + INIT_LIST_HEAD(&ref->node); + list_add_tail(&ref->node, &ppc440spe_adma_chan_list); + } else { + dev_err(&ofdev->dev, "failed to allocate channel reference!\n"); + ret = -ENOMEM; + goto err_ref_alloc; + } + + ret = ppc440spe_adma_setup_irqs(adev, chan, &initcode); + if (ret) + goto err_irq; + + ppc440spe_adma_init_capabilities(adev); + + ret = dma_async_device_register(&adev->common); + if (ret) { + initcode = PPC_ADMA_INIT_REGISTER; + dev_err(&ofdev->dev, "failed to register dma device\n"); + goto err_dev_reg; + } + + goto out; + +err_dev_reg: + ppc440spe_adma_release_irqs(adev, chan); +err_irq: + list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list, node) { + if (chan == to_ppc440spe_adma_chan(ref->chan)) { + list_del(&ref->node); + kfree(ref); + } + } +err_ref_alloc: + if (adev->id != PPC440SPE_XOR_ID) { + dma_unmap_page(&ofdev->dev, chan->pdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + dma_unmap_page(&ofdev->dev, chan->qdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + __free_page(chan->pdest_page); + __free_page(chan->qdest_page); + } +err_page_alloc: + kfree(chan); +err_chan_alloc: + if (adev->id == PPC440SPE_XOR_ID) + iounmap(adev->xor_reg); + else + iounmap(adev->dma_reg); +err_regs_alloc: + dma_free_coherent(adev->dev, adev->pool_size, + adev->dma_desc_pool_virt, + adev->dma_desc_pool); +err_dma_alloc: + kfree(adev); +err_adev_alloc: + release_mem_region(res.start, resource_size(&res)); +out: + if (id < PPC440SPE_ADMA_ENGINES_NUM) + ppc440spe_adma_devices[id] = initcode; + + return ret; +} + +/** + * ppc440spe_adma_remove - remove the asynch device + */ +static int ppc440spe_adma_remove(struct platform_device *ofdev) +{ + struct ppc440spe_adma_device *adev = platform_get_drvdata(ofdev); + struct device_node *np = ofdev->dev.of_node; + struct resource res; + struct dma_chan *chan, *_chan; + struct ppc_dma_chan_ref *ref, *_ref; + struct ppc440spe_adma_chan *ppc440spe_chan; + + if (adev->id < PPC440SPE_ADMA_ENGINES_NUM) + ppc440spe_adma_devices[adev->id] = -1; + + dma_async_device_unregister(&adev->common); + + list_for_each_entry_safe(chan, _chan, &adev->common.channels, + device_node) { + ppc440spe_chan = to_ppc440spe_adma_chan(chan); + ppc440spe_adma_release_irqs(adev, ppc440spe_chan); + tasklet_kill(&ppc440spe_chan->irq_tasklet); + if (adev->id != PPC440SPE_XOR_ID) { + dma_unmap_page(&ofdev->dev, ppc440spe_chan->pdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + dma_unmap_page(&ofdev->dev, ppc440spe_chan->qdest, + PAGE_SIZE, DMA_BIDIRECTIONAL); + __free_page(ppc440spe_chan->pdest_page); + __free_page(ppc440spe_chan->qdest_page); + } + list_for_each_entry_safe(ref, _ref, &ppc440spe_adma_chan_list, + node) { + if (ppc440spe_chan == + to_ppc440spe_adma_chan(ref->chan)) { + list_del(&ref->node); + kfree(ref); + } + } + list_del(&chan->device_node); + kfree(ppc440spe_chan); + } + + dma_free_coherent(adev->dev, adev->pool_size, + adev->dma_desc_pool_virt, adev->dma_desc_pool); + if (adev->id == PPC440SPE_XOR_ID) + iounmap(adev->xor_reg); + else + iounmap(adev->dma_reg); + of_address_to_resource(np, 0, &res); + release_mem_region(res.start, resource_size(&res)); + kfree(adev); + return 0; +} + +/* + * /sys driver interface to enable h/w RAID-6 capabilities + * Files created in e.g. /sys/devices/plb.0/400100100.dma0/driver/ + * directory are "devices", "enable" and "poly". + * "devices" shows available engines. + * "enable" is used to enable RAID-6 capabilities or to check + * whether these has been activated. + * "poly" allows setting/checking used polynomial (for PPC440SPe only). + */ + +static ssize_t show_ppc440spe_devices(struct device_driver *dev, char *buf) +{ + ssize_t size = 0; + int i; + + for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) { + if (ppc440spe_adma_devices[i] == -1) + continue; + size += snprintf(buf + size, PAGE_SIZE - size, + "PPC440SP(E)-ADMA.%d: %s\n", i, + ppc_adma_errors[ppc440spe_adma_devices[i]]); + } + return size; +} + +static ssize_t show_ppc440spe_r6enable(struct device_driver *dev, char *buf) +{ + return snprintf(buf, PAGE_SIZE, + "PPC440SP(e) RAID-6 capabilities are %sABLED.\n", + ppc440spe_r6_enabled ? "EN" : "DIS"); +} + +static ssize_t store_ppc440spe_r6enable(struct device_driver *dev, + const char *buf, size_t count) +{ + unsigned long val; + + if (!count || count > 11) + return -EINVAL; + + if (!ppc440spe_r6_tchan) + return -EFAULT; + + /* Write a key */ + sscanf(buf, "%lx", &val); + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_XORBA, val); + isync(); + + /* Verify whether it really works now */ + if (ppc440spe_test_raid6(ppc440spe_r6_tchan) == 0) { + pr_info("PPC440SP(e) RAID-6 has been activated " + "successfully\n"); + ppc440spe_r6_enabled = 1; + } else { + pr_info("PPC440SP(e) RAID-6 hasn't been activated!" + " Error key ?\n"); + ppc440spe_r6_enabled = 0; + } + return count; +} + +static ssize_t show_ppc440spe_r6poly(struct device_driver *dev, char *buf) +{ + ssize_t size = 0; + u32 reg; + +#ifdef CONFIG_440SP + /* 440SP has fixed polynomial */ + reg = 0x4d; +#else + reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL); + reg >>= MQ0_CFBHL_POLY; + reg &= 0xFF; +#endif + + size = snprintf(buf, PAGE_SIZE, "PPC440SP(e) RAID-6 driver " + "uses 0x1%02x polynomial.\n", reg); + return size; +} + +static ssize_t store_ppc440spe_r6poly(struct device_driver *dev, + const char *buf, size_t count) +{ + unsigned long reg, val; + +#ifdef CONFIG_440SP + /* 440SP uses default 0x14D polynomial only */ + return -EINVAL; +#endif + + if (!count || count > 6) + return -EINVAL; + + /* e.g., 0x14D or 0x11D */ + sscanf(buf, "%lx", &val); + + if (val & ~0x1FF) + return -EINVAL; + + val &= 0xFF; + reg = dcr_read(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL); + reg &= ~(0xFF << MQ0_CFBHL_POLY); + reg |= val << MQ0_CFBHL_POLY; + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL, reg); + + return count; +} + +static DRIVER_ATTR(devices, S_IRUGO, show_ppc440spe_devices, NULL); +static DRIVER_ATTR(enable, S_IRUGO | S_IWUSR, show_ppc440spe_r6enable, + store_ppc440spe_r6enable); +static DRIVER_ATTR(poly, S_IRUGO | S_IWUSR, show_ppc440spe_r6poly, + store_ppc440spe_r6poly); + +/* + * Common initialisation for RAID engines; allocate memory for + * DMAx FIFOs, perform configuration common for all DMA engines. + * Further DMA engine specific configuration is done at probe time. + */ +static int ppc440spe_configure_raid_devices(void) +{ + struct device_node *np; + struct resource i2o_res; + struct i2o_regs __iomem *i2o_reg; + dcr_host_t i2o_dcr_host; + unsigned int dcr_base, dcr_len; + int i, ret; + + np = of_find_compatible_node(NULL, NULL, "ibm,i2o-440spe"); + if (!np) { + pr_err("%s: can't find I2O device tree node\n", + __func__); + return -ENODEV; + } + + if (of_address_to_resource(np, 0, &i2o_res)) { + of_node_put(np); + return -EINVAL; + } + + i2o_reg = of_iomap(np, 0); + if (!i2o_reg) { + pr_err("%s: failed to map I2O registers\n", __func__); + of_node_put(np); + return -EINVAL; + } + + /* Get I2O DCRs base */ + dcr_base = dcr_resource_start(np, 0); + dcr_len = dcr_resource_len(np, 0); + if (!dcr_base && !dcr_len) { + pr_err("%s: can't get DCR registers base/len!\n", + np->full_name); + of_node_put(np); + iounmap(i2o_reg); + return -ENODEV; + } + + i2o_dcr_host = dcr_map(np, dcr_base, dcr_len); + if (!DCR_MAP_OK(i2o_dcr_host)) { + pr_err("%s: failed to map DCRs!\n", np->full_name); + of_node_put(np); + iounmap(i2o_reg); + return -ENODEV; + } + of_node_put(np); + + /* Provide memory regions for DMA's FIFOs: I2O, DMA0 and DMA1 share + * the base address of FIFO memory space. + * Actually we need twice more physical memory than programmed in the + * <fsiz> register (because there are two FIFOs for each DMA: CP and CS) + */ + ppc440spe_dma_fifo_buf = kmalloc((DMA0_FIFO_SIZE + DMA1_FIFO_SIZE) << 1, + GFP_KERNEL); + if (!ppc440spe_dma_fifo_buf) { + pr_err("%s: DMA FIFO buffer allocation failed.\n", __func__); + iounmap(i2o_reg); + dcr_unmap(i2o_dcr_host, dcr_len); + return -ENOMEM; + } + + /* + * Configure h/w + */ + /* Reset I2O/DMA */ + mtdcri(SDR0, DCRN_SDR0_SRST, DCRN_SDR0_SRST_I2ODMA); + mtdcri(SDR0, DCRN_SDR0_SRST, 0); + + /* Setup the base address of mmaped registers */ + dcr_write(i2o_dcr_host, DCRN_I2O0_IBAH, (u32)(i2o_res.start >> 32)); + dcr_write(i2o_dcr_host, DCRN_I2O0_IBAL, (u32)(i2o_res.start) | + I2O_REG_ENABLE); + dcr_unmap(i2o_dcr_host, dcr_len); + + /* Setup FIFO memory space base address */ + iowrite32(0, &i2o_reg->ifbah); + iowrite32(((u32)__pa(ppc440spe_dma_fifo_buf)), &i2o_reg->ifbal); + + /* set zero FIFO size for I2O, so the whole + * ppc440spe_dma_fifo_buf is used by DMAs. + * DMAx_FIFOs will be configured while probe. + */ + iowrite32(0, &i2o_reg->ifsiz); + iounmap(i2o_reg); + + /* To prepare WXOR/RXOR functionality we need access to + * Memory Queue Module DCRs (finally it will be enabled + * via /sys interface of the ppc440spe ADMA driver). + */ + np = of_find_compatible_node(NULL, NULL, "ibm,mq-440spe"); + if (!np) { + pr_err("%s: can't find MQ device tree node\n", + __func__); + ret = -ENODEV; + goto out_free; + } + + /* Get MQ DCRs base */ + dcr_base = dcr_resource_start(np, 0); + dcr_len = dcr_resource_len(np, 0); + if (!dcr_base && !dcr_len) { + pr_err("%s: can't get DCR registers base/len!\n", + np->full_name); + ret = -ENODEV; + goto out_mq; + } + + ppc440spe_mq_dcr_host = dcr_map(np, dcr_base, dcr_len); + if (!DCR_MAP_OK(ppc440spe_mq_dcr_host)) { + pr_err("%s: failed to map DCRs!\n", np->full_name); + ret = -ENODEV; + goto out_mq; + } + of_node_put(np); + ppc440spe_mq_dcr_len = dcr_len; + + /* Set HB alias */ + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_BAUH, DMA_CUED_XOR_HB); + + /* Set: + * - LL transaction passing limit to 1; + * - Memory controller cycle limit to 1; + * - Galois Polynomial to 0x14d (default) + */ + dcr_write(ppc440spe_mq_dcr_host, DCRN_MQ0_CFBHL, + (1 << MQ0_CFBHL_TPLM) | (1 << MQ0_CFBHL_HBCL) | + (PPC440SPE_DEFAULT_POLY << MQ0_CFBHL_POLY)); + + atomic_set(&ppc440spe_adma_err_irq_ref, 0); + for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) + ppc440spe_adma_devices[i] = -1; + + return 0; + +out_mq: + of_node_put(np); +out_free: + kfree(ppc440spe_dma_fifo_buf); + return ret; +} + +static const struct of_device_id ppc440spe_adma_of_match[] = { + { .compatible = "ibm,dma-440spe", }, + { .compatible = "amcc,xor-accelerator", }, + {}, +}; +MODULE_DEVICE_TABLE(of, ppc440spe_adma_of_match); + +static struct platform_driver ppc440spe_adma_driver = { + .probe = ppc440spe_adma_probe, + .remove = ppc440spe_adma_remove, + .driver = { + .name = "PPC440SP(E)-ADMA", + .of_match_table = ppc440spe_adma_of_match, + }, +}; + +static __init int ppc440spe_adma_init(void) +{ + int ret; + + ret = ppc440spe_configure_raid_devices(); + if (ret) + return ret; + + ret = platform_driver_register(&ppc440spe_adma_driver); + if (ret) { + pr_err("%s: failed to register platform driver\n", + __func__); + goto out_reg; + } + + /* Initialization status */ + ret = driver_create_file(&ppc440spe_adma_driver.driver, + &driver_attr_devices); + if (ret) + goto out_dev; + + /* RAID-6 h/w enable entry */ + ret = driver_create_file(&ppc440spe_adma_driver.driver, + &driver_attr_enable); + if (ret) + goto out_en; + + /* GF polynomial to use */ + ret = driver_create_file(&ppc440spe_adma_driver.driver, + &driver_attr_poly); + if (!ret) + return ret; + + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_enable); +out_en: + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_devices); +out_dev: + /* User will not be able to enable h/w RAID-6 */ + pr_err("%s: failed to create RAID-6 driver interface\n", + __func__); + platform_driver_unregister(&ppc440spe_adma_driver); +out_reg: + dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len); + kfree(ppc440spe_dma_fifo_buf); + return ret; +} + +static void __exit ppc440spe_adma_exit(void) +{ + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_poly); + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_enable); + driver_remove_file(&ppc440spe_adma_driver.driver, + &driver_attr_devices); + platform_driver_unregister(&ppc440spe_adma_driver); + dcr_unmap(ppc440spe_mq_dcr_host, ppc440spe_mq_dcr_len); + kfree(ppc440spe_dma_fifo_buf); +} + +arch_initcall(ppc440spe_adma_init); +module_exit(ppc440spe_adma_exit); + +MODULE_AUTHOR("Yuri Tikhonov <yur@emcraft.com>"); +MODULE_DESCRIPTION("PPC440SPE ADMA Engine Driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/ppc4xx/adma.h b/drivers/dma/ppc4xx/adma.h new file mode 100644 index 000000000..26b7a5ed9 --- /dev/null +++ b/drivers/dma/ppc4xx/adma.h @@ -0,0 +1,193 @@ +/* + * 2006-2009 (C) DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of + * any kind, whether express or implied. + */ + +#ifndef _PPC440SPE_ADMA_H +#define _PPC440SPE_ADMA_H + +#include <linux/types.h> +#include "dma.h" +#include "xor.h" + +#define to_ppc440spe_adma_chan(chan) \ + container_of(chan, struct ppc440spe_adma_chan, common) +#define to_ppc440spe_adma_device(dev) \ + container_of(dev, struct ppc440spe_adma_device, common) +#define tx_to_ppc440spe_adma_slot(tx) \ + container_of(tx, struct ppc440spe_adma_desc_slot, async_tx) + +/* Default polynomial (for 440SP is only available) */ +#define PPC440SPE_DEFAULT_POLY 0x4d + +#define PPC440SPE_ADMA_ENGINES_NUM (XOR_ENGINES_NUM + DMA_ENGINES_NUM) + +#define PPC440SPE_ADMA_WATCHDOG_MSEC 3 +#define PPC440SPE_ADMA_THRESHOLD 1 + +#define PPC440SPE_DMA0_ID 0 +#define PPC440SPE_DMA1_ID 1 +#define PPC440SPE_XOR_ID 2 + +#define PPC440SPE_ADMA_DMA_MAX_BYTE_COUNT 0xFFFFFFUL +/* this is the XOR_CBBCR width */ +#define PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT (1 << 31) +#define PPC440SPE_ADMA_ZERO_SUM_MAX_BYTE_COUNT PPC440SPE_ADMA_XOR_MAX_BYTE_COUNT + +#define PPC440SPE_RXOR_RUN 0 + +#define MQ0_CF2H_RXOR_BS_MASK 0x1FF + +#undef ADMA_LL_DEBUG + +/** + * struct ppc440spe_adma_device - internal representation of an ADMA device + * @dev: device + * @dma_reg: base for DMAx register access + * @xor_reg: base for XOR register access + * @i2o_reg: base for I2O register access + * @id: HW ADMA Device selector + * @dma_desc_pool_virt: base of DMA descriptor region (CPU address) + * @dma_desc_pool: base of DMA descriptor region (DMA address) + * @pool_size: size of the pool + * @irq: DMAx or XOR irq number + * @err_irq: DMAx error irq number + * @common: embedded struct dma_device + */ +struct ppc440spe_adma_device { + struct device *dev; + struct dma_regs __iomem *dma_reg; + struct xor_regs __iomem *xor_reg; + struct i2o_regs __iomem *i2o_reg; + int id; + void *dma_desc_pool_virt; + dma_addr_t dma_desc_pool; + size_t pool_size; + int irq; + int err_irq; + struct dma_device common; +}; + +/** + * struct ppc440spe_adma_chan - internal representation of an ADMA channel + * @lock: serializes enqueue/dequeue operations to the slot pool + * @device: parent device + * @chain: device chain view of the descriptors + * @common: common dmaengine channel object members + * @all_slots: complete domain of slots usable by the channel + * @pending: allows batching of hardware operations + * @slots_allocated: records the actual size of the descriptor slot pool + * @hw_chain_inited: h/w descriptor chain initialization flag + * @irq_tasklet: bottom half where ppc440spe_adma_slot_cleanup runs + * @needs_unmap: if buffers should not be unmapped upon final processing + * @pdest_page: P destination page for async validate operation + * @qdest_page: Q destination page for async validate operation + * @pdest: P dma addr for async validate operation + * @qdest: Q dma addr for async validate operation + */ +struct ppc440spe_adma_chan { + spinlock_t lock; + struct ppc440spe_adma_device *device; + struct list_head chain; + struct dma_chan common; + struct list_head all_slots; + struct ppc440spe_adma_desc_slot *last_used; + int pending; + int slots_allocated; + int hw_chain_inited; + struct tasklet_struct irq_tasklet; + u8 needs_unmap; + struct page *pdest_page; + struct page *qdest_page; + dma_addr_t pdest; + dma_addr_t qdest; +}; + +struct ppc440spe_rxor { + u32 addrl; + u32 addrh; + int len; + int xor_count; + int addr_count; + int desc_count; + int state; +}; + +/** + * struct ppc440spe_adma_desc_slot - PPC440SPE-ADMA software descriptor + * @phys: hardware address of the hardware descriptor chain + * @group_head: first operation in a transaction + * @hw_next: pointer to the next descriptor in chain + * @async_tx: support for the async_tx api + * @slot_node: node on the iop_adma_chan.all_slots list + * @chain_node: node on the op_adma_chan.chain list + * @group_list: list of slots that make up a multi-descriptor transaction + * for example transfer lengths larger than the supported hw max + * @unmap_len: transaction bytecount + * @hw_desc: virtual address of the hardware descriptor chain + * @stride: currently chained or not + * @idx: pool index + * @slot_cnt: total slots used in an transaction (group of operations) + * @src_cnt: number of sources set in this descriptor + * @dst_cnt: number of destinations set in the descriptor + * @slots_per_op: number of slots per operation + * @descs_per_op: number of slot per P/Q operation see comment + * for ppc440spe_prep_dma_pqxor function + * @flags: desc state/type + * @reverse_flags: 1 if a corresponding rxor address uses reversed address order + * @xor_check_result: result of zero sum + * @crc32_result: result crc calculation + */ +struct ppc440spe_adma_desc_slot { + dma_addr_t phys; + struct ppc440spe_adma_desc_slot *group_head; + struct ppc440spe_adma_desc_slot *hw_next; + struct dma_async_tx_descriptor async_tx; + struct list_head slot_node; + struct list_head chain_node; /* node in channel ops list */ + struct list_head group_list; /* list */ + unsigned int unmap_len; + void *hw_desc; + u16 stride; + u16 idx; + u16 slot_cnt; + u8 src_cnt; + u8 dst_cnt; + u8 slots_per_op; + u8 descs_per_op; + unsigned long flags; + unsigned long reverse_flags[8]; + +#define PPC440SPE_DESC_INT 0 /* generate interrupt on complete */ +#define PPC440SPE_ZERO_P 1 /* clear P destionaion */ +#define PPC440SPE_ZERO_Q 2 /* clear Q destination */ +#define PPC440SPE_COHERENT 3 /* src/dst are coherent */ + +#define PPC440SPE_DESC_WXOR 4 /* WXORs are in chain */ +#define PPC440SPE_DESC_RXOR 5 /* RXOR is in chain */ + +#define PPC440SPE_DESC_RXOR123 8 /* CDB for RXOR123 operation */ +#define PPC440SPE_DESC_RXOR124 9 /* CDB for RXOR124 operation */ +#define PPC440SPE_DESC_RXOR125 10 /* CDB for RXOR125 operation */ +#define PPC440SPE_DESC_RXOR12 11 /* CDB for RXOR12 operation */ +#define PPC440SPE_DESC_RXOR_REV 12 /* CDB has srcs in reversed order */ + +#define PPC440SPE_DESC_PCHECK 13 +#define PPC440SPE_DESC_QCHECK 14 + +#define PPC440SPE_DESC_RXOR_MSK 0x3 + + struct ppc440spe_rxor rxor_cursor; + + union { + u32 *xor_check_result; + u32 *crc32_result; + }; +}; + +#endif /* _PPC440SPE_ADMA_H */ diff --git a/drivers/dma/ppc4xx/dma.h b/drivers/dma/ppc4xx/dma.h new file mode 100644 index 000000000..bcde2df2f --- /dev/null +++ b/drivers/dma/ppc4xx/dma.h @@ -0,0 +1,223 @@ +/* + * 440SPe's DMA engines support header file + * + * 2006-2009 (C) DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * This file is licensed under the term of the GNU General Public License + * version 2. The program licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#ifndef _PPC440SPE_DMA_H +#define _PPC440SPE_DMA_H + +#include <linux/types.h> + +/* Number of elements in the array with statical CDBs */ +#define MAX_STAT_DMA_CDBS 16 +/* Number of DMA engines available on the contoller */ +#define DMA_ENGINES_NUM 2 + +/* Maximum h/w supported number of destinations */ +#define DMA_DEST_MAX_NUM 2 + +/* FIFO's params */ +#define DMA0_FIFO_SIZE 0x1000 +#define DMA1_FIFO_SIZE 0x1000 +#define DMA_FIFO_ENABLE (1<<12) + +/* DMA Configuration Register. Data Transfer Engine PLB Priority: */ +#define DMA_CFG_DXEPR_LP (0<<26) +#define DMA_CFG_DXEPR_HP (3<<26) +#define DMA_CFG_DXEPR_HHP (2<<26) +#define DMA_CFG_DXEPR_HHHP (1<<26) + +/* DMA Configuration Register. DMA FIFO Manager PLB Priority: */ +#define DMA_CFG_DFMPP_LP (0<<23) +#define DMA_CFG_DFMPP_HP (3<<23) +#define DMA_CFG_DFMPP_HHP (2<<23) +#define DMA_CFG_DFMPP_HHHP (1<<23) + +/* DMA Configuration Register. Force 64-byte Alignment */ +#define DMA_CFG_FALGN (1 << 19) + +/*UIC0:*/ +#define D0CPF_INT (1<<12) +#define D0CSF_INT (1<<11) +#define D1CPF_INT (1<<10) +#define D1CSF_INT (1<<9) +/*UIC1:*/ +#define DMAE_INT (1<<9) + +/* I2O IOP Interrupt Mask Register */ +#define I2O_IOPIM_P0SNE (1<<3) +#define I2O_IOPIM_P0EM (1<<5) +#define I2O_IOPIM_P1SNE (1<<6) +#define I2O_IOPIM_P1EM (1<<8) + +/* DMA CDB fields */ +#define DMA_CDB_MSK (0xF) +#define DMA_CDB_64B_ADDR (1<<2) +#define DMA_CDB_NO_INT (1<<3) +#define DMA_CDB_STATUS_MSK (0x3) +#define DMA_CDB_ADDR_MSK (0xFFFFFFF0) + +/* DMA CDB OpCodes */ +#define DMA_CDB_OPC_NO_OP (0x00) +#define DMA_CDB_OPC_MV_SG1_SG2 (0x01) +#define DMA_CDB_OPC_MULTICAST (0x05) +#define DMA_CDB_OPC_DFILL128 (0x24) +#define DMA_CDB_OPC_DCHECK128 (0x23) + +#define DMA_CUED_XOR_BASE (0x10000000) +#define DMA_CUED_XOR_HB (0x00000008) + +#ifdef CONFIG_440SP +#define DMA_CUED_MULT1_OFF 0 +#define DMA_CUED_MULT2_OFF 8 +#define DMA_CUED_MULT3_OFF 16 +#define DMA_CUED_REGION_OFF 24 +#define DMA_CUED_XOR_WIN_MSK (0xFC000000) +#else +#define DMA_CUED_MULT1_OFF 2 +#define DMA_CUED_MULT2_OFF 10 +#define DMA_CUED_MULT3_OFF 18 +#define DMA_CUED_REGION_OFF 26 +#define DMA_CUED_XOR_WIN_MSK (0xF0000000) +#endif + +#define DMA_CUED_REGION_MSK 0x3 +#define DMA_RXOR123 0x0 +#define DMA_RXOR124 0x1 +#define DMA_RXOR125 0x2 +#define DMA_RXOR12 0x3 + +/* S/G addresses */ +#define DMA_CDB_SG_SRC 1 +#define DMA_CDB_SG_DST1 2 +#define DMA_CDB_SG_DST2 3 + +/* + * DMAx engines Command Descriptor Block Type + */ +struct dma_cdb { + /* + * Basic CDB structure (Table 20-17, p.499, 440spe_um_1_22.pdf) + */ + u8 pad0[2]; /* reserved */ + u8 attr; /* attributes */ + u8 opc; /* opcode */ + u32 sg1u; /* upper SG1 address */ + u32 sg1l; /* lower SG1 address */ + u32 cnt; /* SG count, 3B used */ + u32 sg2u; /* upper SG2 address */ + u32 sg2l; /* lower SG2 address */ + u32 sg3u; /* upper SG3 address */ + u32 sg3l; /* lower SG3 address */ +}; + +/* + * DMAx hardware registers (p.515 in 440SPe UM 1.22) + */ +struct dma_regs { + u32 cpfpl; + u32 cpfph; + u32 csfpl; + u32 csfph; + u32 dsts; + u32 cfg; + u8 pad0[0x8]; + u16 cpfhp; + u16 cpftp; + u16 csfhp; + u16 csftp; + u8 pad1[0x8]; + u32 acpl; + u32 acph; + u32 s1bpl; + u32 s1bph; + u32 s2bpl; + u32 s2bph; + u32 s3bpl; + u32 s3bph; + u8 pad2[0x10]; + u32 earl; + u32 earh; + u8 pad3[0x8]; + u32 seat; + u32 sead; + u32 op; + u32 fsiz; +}; + +/* + * I2O hardware registers (p.528 in 440SPe UM 1.22) + */ +struct i2o_regs { + u32 ists; + u32 iseat; + u32 isead; + u8 pad0[0x14]; + u32 idbel; + u8 pad1[0xc]; + u32 ihis; + u32 ihim; + u8 pad2[0x8]; + u32 ihiq; + u32 ihoq; + u8 pad3[0x8]; + u32 iopis; + u32 iopim; + u32 iopiq; + u8 iopoq; + u8 pad4[3]; + u16 iiflh; + u16 iiflt; + u16 iiplh; + u16 iiplt; + u16 ioflh; + u16 ioflt; + u16 ioplh; + u16 ioplt; + u32 iidc; + u32 ictl; + u32 ifcpp; + u8 pad5[0x4]; + u16 mfac0; + u16 mfac1; + u16 mfac2; + u16 mfac3; + u16 mfac4; + u16 mfac5; + u16 mfac6; + u16 mfac7; + u16 ifcfh; + u16 ifcht; + u8 pad6[0x4]; + u32 iifmc; + u32 iodb; + u32 iodbc; + u32 ifbal; + u32 ifbah; + u32 ifsiz; + u32 ispd0; + u32 ispd1; + u32 ispd2; + u32 ispd3; + u32 ihipl; + u32 ihiph; + u32 ihopl; + u32 ihoph; + u32 iiipl; + u32 iiiph; + u32 iiopl; + u32 iioph; + u32 ifcpl; + u32 ifcph; + u8 pad7[0x8]; + u32 iopt; +}; + +#endif /* _PPC440SPE_DMA_H */ diff --git a/drivers/dma/ppc4xx/xor.h b/drivers/dma/ppc4xx/xor.h new file mode 100644 index 000000000..daed7384d --- /dev/null +++ b/drivers/dma/ppc4xx/xor.h @@ -0,0 +1,110 @@ +/* + * 440SPe's XOR engines support header file + * + * 2006-2009 (C) DENX Software Engineering. + * + * Author: Yuri Tikhonov <yur@emcraft.com> + * + * This file is licensed under the term of the GNU General Public License + * version 2. The program licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#ifndef _PPC440SPE_XOR_H +#define _PPC440SPE_XOR_H + +#include <linux/types.h> + +/* Number of XOR engines available on the contoller */ +#define XOR_ENGINES_NUM 1 + +/* Number of operands supported in the h/w */ +#define XOR_MAX_OPS 16 + +/* + * XOR Command Block Control Register bits + */ +#define XOR_CBCR_LNK_BIT (1<<31) /* link present */ +#define XOR_CBCR_TGT_BIT (1<<30) /* target present */ +#define XOR_CBCR_CBCE_BIT (1<<29) /* command block compete enable */ +#define XOR_CBCR_RNZE_BIT (1<<28) /* result not zero enable */ +#define XOR_CBCR_XNOR_BIT (1<<15) /* XOR/XNOR */ +#define XOR_CDCR_OAC_MSK (0x7F) /* operand address count */ + +/* + * XORCore Status Register bits + */ +#define XOR_SR_XCP_BIT (1<<31) /* core processing */ +#define XOR_SR_ICB_BIT (1<<17) /* invalid CB */ +#define XOR_SR_IC_BIT (1<<16) /* invalid command */ +#define XOR_SR_IPE_BIT (1<<15) /* internal parity error */ +#define XOR_SR_RNZ_BIT (1<<2) /* result not Zero */ +#define XOR_SR_CBC_BIT (1<<1) /* CB complete */ +#define XOR_SR_CBLC_BIT (1<<0) /* CB list complete */ + +/* + * XORCore Control Set and Reset Register bits + */ +#define XOR_CRSR_XASR_BIT (1<<31) /* soft reset */ +#define XOR_CRSR_XAE_BIT (1<<30) /* enable */ +#define XOR_CRSR_RCBE_BIT (1<<29) /* refetch CB enable */ +#define XOR_CRSR_PAUS_BIT (1<<28) /* pause */ +#define XOR_CRSR_64BA_BIT (1<<27) /* 64/32 CB format */ +#define XOR_CRSR_CLP_BIT (1<<25) /* continue list processing */ + +/* + * XORCore Interrupt Enable Register + */ +#define XOR_IE_ICBIE_BIT (1<<17) /* Invalid Command Block IRQ Enable */ +#define XOR_IE_ICIE_BIT (1<<16) /* Invalid Command IRQ Enable */ +#define XOR_IE_RPTIE_BIT (1<<14) /* Read PLB Timeout Error IRQ Enable */ +#define XOR_IE_CBCIE_BIT (1<<1) /* CB complete interrupt enable */ +#define XOR_IE_CBLCI_BIT (1<<0) /* CB list complete interrupt enable */ + +/* + * XOR Accelerator engine Command Block Type + */ +struct xor_cb { + /* + * Basic 64-bit format XOR CB (Table 19-1, p.463, 440spe_um_1_22.pdf) + */ + u32 cbc; /* control */ + u32 cbbc; /* byte count */ + u32 cbs; /* status */ + u8 pad0[4]; /* reserved */ + u32 cbtah; /* target address high */ + u32 cbtal; /* target address low */ + u32 cblah; /* link address high */ + u32 cblal; /* link address low */ + struct { + u32 h; + u32 l; + } __attribute__ ((packed)) ops[16]; +} __attribute__ ((packed)); + +/* + * XOR hardware registers Table 19-3, UM 1.22 + */ +struct xor_regs { + u32 op_ar[16][2]; /* operand address[0]-high,[1]-low registers */ + u8 pad0[352]; /* reserved */ + u32 cbcr; /* CB control register */ + u32 cbbcr; /* CB byte count register */ + u32 cbsr; /* CB status register */ + u8 pad1[4]; /* reserved */ + u32 cbtahr; /* operand target address high register */ + u32 cbtalr; /* operand target address low register */ + u32 cblahr; /* CB link address high register */ + u32 cblalr; /* CB link address low register */ + u32 crsr; /* control set register */ + u32 crrr; /* control reset register */ + u32 ccbahr; /* current CB address high register */ + u32 ccbalr; /* current CB address low register */ + u32 plbr; /* PLB configuration register */ + u32 ier; /* interrupt enable register */ + u32 pecr; /* parity error count register */ + u32 sr; /* status register */ + u32 revidr; /* revision ID register */ +}; + +#endif /* _PPC440SPE_XOR_H */ diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c new file mode 100644 index 000000000..5a250cdc8 --- /dev/null +++ b/drivers/dma/qcom_bam_dma.c @@ -0,0 +1,1259 @@ +/* + * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ +/* + * QCOM BAM DMA engine driver + * + * QCOM BAM DMA blocks are distributed amongst a number of the on-chip + * peripherals on the MSM 8x74. The configuration of the channels are dependent + * on the way they are hard wired to that specific peripheral. The peripheral + * device tree entries specify the configuration of each channel. + * + * The DMA controller requires the use of external memory for storage of the + * hardware descriptors for each channel. The descriptor FIFO is accessed as a + * circular buffer and operations are managed according to the offset within the + * FIFO. After pipe/channel reset, all of the pipe registers and internal state + * are back to defaults. + * + * During DMA operations, we write descriptors to the FIFO, being careful to + * handle wrapping and then write the last FIFO offset to that channel's + * P_EVNT_REG register to kick off the transaction. The P_SW_OFSTS register + * indicates the current FIFO offset that is being processed, so there is some + * indication of where the hardware is currently working. + */ + +#include <linux/kernel.h> +#include <linux/io.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/scatterlist.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_dma.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> + +#include "dmaengine.h" +#include "virt-dma.h" + +struct bam_desc_hw { + u32 addr; /* Buffer physical address */ + u16 size; /* Buffer size in bytes */ + u16 flags; +}; + +#define DESC_FLAG_INT BIT(15) +#define DESC_FLAG_EOT BIT(14) +#define DESC_FLAG_EOB BIT(13) +#define DESC_FLAG_NWD BIT(12) + +struct bam_async_desc { + struct virt_dma_desc vd; + + u32 num_desc; + u32 xfer_len; + + /* transaction flags, EOT|EOB|NWD */ + u16 flags; + + struct bam_desc_hw *curr_desc; + + enum dma_transfer_direction dir; + size_t length; + struct bam_desc_hw desc[0]; +}; + +enum bam_reg { + BAM_CTRL, + BAM_REVISION, + BAM_NUM_PIPES, + BAM_DESC_CNT_TRSHLD, + BAM_IRQ_SRCS, + BAM_IRQ_SRCS_MSK, + BAM_IRQ_SRCS_UNMASKED, + BAM_IRQ_STTS, + BAM_IRQ_CLR, + BAM_IRQ_EN, + BAM_CNFG_BITS, + BAM_IRQ_SRCS_EE, + BAM_IRQ_SRCS_MSK_EE, + BAM_P_CTRL, + BAM_P_RST, + BAM_P_HALT, + BAM_P_IRQ_STTS, + BAM_P_IRQ_CLR, + BAM_P_IRQ_EN, + BAM_P_EVNT_DEST_ADDR, + BAM_P_EVNT_REG, + BAM_P_SW_OFSTS, + BAM_P_DATA_FIFO_ADDR, + BAM_P_DESC_FIFO_ADDR, + BAM_P_EVNT_GEN_TRSHLD, + BAM_P_FIFO_SIZES, +}; + +struct reg_offset_data { + u32 base_offset; + unsigned int pipe_mult, evnt_mult, ee_mult; +}; + +static const struct reg_offset_data bam_v1_3_reg_info[] = { + [BAM_CTRL] = { 0x0F80, 0x00, 0x00, 0x00 }, + [BAM_REVISION] = { 0x0F84, 0x00, 0x00, 0x00 }, + [BAM_NUM_PIPES] = { 0x0FBC, 0x00, 0x00, 0x00 }, + [BAM_DESC_CNT_TRSHLD] = { 0x0F88, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS] = { 0x0F8C, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_MSK] = { 0x0F90, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_UNMASKED] = { 0x0FB0, 0x00, 0x00, 0x00 }, + [BAM_IRQ_STTS] = { 0x0F94, 0x00, 0x00, 0x00 }, + [BAM_IRQ_CLR] = { 0x0F98, 0x00, 0x00, 0x00 }, + [BAM_IRQ_EN] = { 0x0F9C, 0x00, 0x00, 0x00 }, + [BAM_CNFG_BITS] = { 0x0FFC, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_EE] = { 0x1800, 0x00, 0x00, 0x80 }, + [BAM_IRQ_SRCS_MSK_EE] = { 0x1804, 0x00, 0x00, 0x80 }, + [BAM_P_CTRL] = { 0x0000, 0x80, 0x00, 0x00 }, + [BAM_P_RST] = { 0x0004, 0x80, 0x00, 0x00 }, + [BAM_P_HALT] = { 0x0008, 0x80, 0x00, 0x00 }, + [BAM_P_IRQ_STTS] = { 0x0010, 0x80, 0x00, 0x00 }, + [BAM_P_IRQ_CLR] = { 0x0014, 0x80, 0x00, 0x00 }, + [BAM_P_IRQ_EN] = { 0x0018, 0x80, 0x00, 0x00 }, + [BAM_P_EVNT_DEST_ADDR] = { 0x102C, 0x00, 0x40, 0x00 }, + [BAM_P_EVNT_REG] = { 0x1018, 0x00, 0x40, 0x00 }, + [BAM_P_SW_OFSTS] = { 0x1000, 0x00, 0x40, 0x00 }, + [BAM_P_DATA_FIFO_ADDR] = { 0x1024, 0x00, 0x40, 0x00 }, + [BAM_P_DESC_FIFO_ADDR] = { 0x101C, 0x00, 0x40, 0x00 }, + [BAM_P_EVNT_GEN_TRSHLD] = { 0x1028, 0x00, 0x40, 0x00 }, + [BAM_P_FIFO_SIZES] = { 0x1020, 0x00, 0x40, 0x00 }, +}; + +static const struct reg_offset_data bam_v1_4_reg_info[] = { + [BAM_CTRL] = { 0x0000, 0x00, 0x00, 0x00 }, + [BAM_REVISION] = { 0x0004, 0x00, 0x00, 0x00 }, + [BAM_NUM_PIPES] = { 0x003C, 0x00, 0x00, 0x00 }, + [BAM_DESC_CNT_TRSHLD] = { 0x0008, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS] = { 0x000C, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_MSK] = { 0x0010, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_UNMASKED] = { 0x0030, 0x00, 0x00, 0x00 }, + [BAM_IRQ_STTS] = { 0x0014, 0x00, 0x00, 0x00 }, + [BAM_IRQ_CLR] = { 0x0018, 0x00, 0x00, 0x00 }, + [BAM_IRQ_EN] = { 0x001C, 0x00, 0x00, 0x00 }, + [BAM_CNFG_BITS] = { 0x007C, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_EE] = { 0x0800, 0x00, 0x00, 0x80 }, + [BAM_IRQ_SRCS_MSK_EE] = { 0x0804, 0x00, 0x00, 0x80 }, + [BAM_P_CTRL] = { 0x1000, 0x1000, 0x00, 0x00 }, + [BAM_P_RST] = { 0x1004, 0x1000, 0x00, 0x00 }, + [BAM_P_HALT] = { 0x1008, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_STTS] = { 0x1010, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_CLR] = { 0x1014, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_EN] = { 0x1018, 0x1000, 0x00, 0x00 }, + [BAM_P_EVNT_DEST_ADDR] = { 0x182C, 0x00, 0x1000, 0x00 }, + [BAM_P_EVNT_REG] = { 0x1818, 0x00, 0x1000, 0x00 }, + [BAM_P_SW_OFSTS] = { 0x1800, 0x00, 0x1000, 0x00 }, + [BAM_P_DATA_FIFO_ADDR] = { 0x1824, 0x00, 0x1000, 0x00 }, + [BAM_P_DESC_FIFO_ADDR] = { 0x181C, 0x00, 0x1000, 0x00 }, + [BAM_P_EVNT_GEN_TRSHLD] = { 0x1828, 0x00, 0x1000, 0x00 }, + [BAM_P_FIFO_SIZES] = { 0x1820, 0x00, 0x1000, 0x00 }, +}; + +static const struct reg_offset_data bam_v1_7_reg_info[] = { + [BAM_CTRL] = { 0x00000, 0x00, 0x00, 0x00 }, + [BAM_REVISION] = { 0x01000, 0x00, 0x00, 0x00 }, + [BAM_NUM_PIPES] = { 0x01008, 0x00, 0x00, 0x00 }, + [BAM_DESC_CNT_TRSHLD] = { 0x00008, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS] = { 0x03010, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_MSK] = { 0x03014, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_UNMASKED] = { 0x03018, 0x00, 0x00, 0x00 }, + [BAM_IRQ_STTS] = { 0x00014, 0x00, 0x00, 0x00 }, + [BAM_IRQ_CLR] = { 0x00018, 0x00, 0x00, 0x00 }, + [BAM_IRQ_EN] = { 0x0001C, 0x00, 0x00, 0x00 }, + [BAM_CNFG_BITS] = { 0x0007C, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_EE] = { 0x03000, 0x00, 0x00, 0x1000 }, + [BAM_IRQ_SRCS_MSK_EE] = { 0x03004, 0x00, 0x00, 0x1000 }, + [BAM_P_CTRL] = { 0x13000, 0x1000, 0x00, 0x00 }, + [BAM_P_RST] = { 0x13004, 0x1000, 0x00, 0x00 }, + [BAM_P_HALT] = { 0x13008, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_STTS] = { 0x13010, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_CLR] = { 0x13014, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_EN] = { 0x13018, 0x1000, 0x00, 0x00 }, + [BAM_P_EVNT_DEST_ADDR] = { 0x1382C, 0x00, 0x1000, 0x00 }, + [BAM_P_EVNT_REG] = { 0x13818, 0x00, 0x1000, 0x00 }, + [BAM_P_SW_OFSTS] = { 0x13800, 0x00, 0x1000, 0x00 }, + [BAM_P_DATA_FIFO_ADDR] = { 0x13824, 0x00, 0x1000, 0x00 }, + [BAM_P_DESC_FIFO_ADDR] = { 0x1381C, 0x00, 0x1000, 0x00 }, + [BAM_P_EVNT_GEN_TRSHLD] = { 0x13828, 0x00, 0x1000, 0x00 }, + [BAM_P_FIFO_SIZES] = { 0x13820, 0x00, 0x1000, 0x00 }, +}; + +/* BAM CTRL */ +#define BAM_SW_RST BIT(0) +#define BAM_EN BIT(1) +#define BAM_EN_ACCUM BIT(4) +#define BAM_TESTBUS_SEL_SHIFT 5 +#define BAM_TESTBUS_SEL_MASK 0x3F +#define BAM_DESC_CACHE_SEL_SHIFT 13 +#define BAM_DESC_CACHE_SEL_MASK 0x3 +#define BAM_CACHED_DESC_STORE BIT(15) +#define IBC_DISABLE BIT(16) + +/* BAM REVISION */ +#define REVISION_SHIFT 0 +#define REVISION_MASK 0xFF +#define NUM_EES_SHIFT 8 +#define NUM_EES_MASK 0xF +#define CE_BUFFER_SIZE BIT(13) +#define AXI_ACTIVE BIT(14) +#define USE_VMIDMT BIT(15) +#define SECURED BIT(16) +#define BAM_HAS_NO_BYPASS BIT(17) +#define HIGH_FREQUENCY_BAM BIT(18) +#define INACTIV_TMRS_EXST BIT(19) +#define NUM_INACTIV_TMRS BIT(20) +#define DESC_CACHE_DEPTH_SHIFT 21 +#define DESC_CACHE_DEPTH_1 (0 << DESC_CACHE_DEPTH_SHIFT) +#define DESC_CACHE_DEPTH_2 (1 << DESC_CACHE_DEPTH_SHIFT) +#define DESC_CACHE_DEPTH_3 (2 << DESC_CACHE_DEPTH_SHIFT) +#define DESC_CACHE_DEPTH_4 (3 << DESC_CACHE_DEPTH_SHIFT) +#define CMD_DESC_EN BIT(23) +#define INACTIV_TMR_BASE_SHIFT 24 +#define INACTIV_TMR_BASE_MASK 0xFF + +/* BAM NUM PIPES */ +#define BAM_NUM_PIPES_SHIFT 0 +#define BAM_NUM_PIPES_MASK 0xFF +#define PERIPH_NON_PIPE_GRP_SHIFT 16 +#define PERIPH_NON_PIP_GRP_MASK 0xFF +#define BAM_NON_PIPE_GRP_SHIFT 24 +#define BAM_NON_PIPE_GRP_MASK 0xFF + +/* BAM CNFG BITS */ +#define BAM_PIPE_CNFG BIT(2) +#define BAM_FULL_PIPE BIT(11) +#define BAM_NO_EXT_P_RST BIT(12) +#define BAM_IBC_DISABLE BIT(13) +#define BAM_SB_CLK_REQ BIT(14) +#define BAM_PSM_CSW_REQ BIT(15) +#define BAM_PSM_P_RES BIT(16) +#define BAM_AU_P_RES BIT(17) +#define BAM_SI_P_RES BIT(18) +#define BAM_WB_P_RES BIT(19) +#define BAM_WB_BLK_CSW BIT(20) +#define BAM_WB_CSW_ACK_IDL BIT(21) +#define BAM_WB_RETR_SVPNT BIT(22) +#define BAM_WB_DSC_AVL_P_RST BIT(23) +#define BAM_REG_P_EN BIT(24) +#define BAM_PSM_P_HD_DATA BIT(25) +#define BAM_AU_ACCUMED BIT(26) +#define BAM_CMD_ENABLE BIT(27) + +#define BAM_CNFG_BITS_DEFAULT (BAM_PIPE_CNFG | \ + BAM_NO_EXT_P_RST | \ + BAM_IBC_DISABLE | \ + BAM_SB_CLK_REQ | \ + BAM_PSM_CSW_REQ | \ + BAM_PSM_P_RES | \ + BAM_AU_P_RES | \ + BAM_SI_P_RES | \ + BAM_WB_P_RES | \ + BAM_WB_BLK_CSW | \ + BAM_WB_CSW_ACK_IDL | \ + BAM_WB_RETR_SVPNT | \ + BAM_WB_DSC_AVL_P_RST | \ + BAM_REG_P_EN | \ + BAM_PSM_P_HD_DATA | \ + BAM_AU_ACCUMED | \ + BAM_CMD_ENABLE) + +/* PIPE CTRL */ +#define P_EN BIT(1) +#define P_DIRECTION BIT(3) +#define P_SYS_STRM BIT(4) +#define P_SYS_MODE BIT(5) +#define P_AUTO_EOB BIT(6) +#define P_AUTO_EOB_SEL_SHIFT 7 +#define P_AUTO_EOB_SEL_512 (0 << P_AUTO_EOB_SEL_SHIFT) +#define P_AUTO_EOB_SEL_256 (1 << P_AUTO_EOB_SEL_SHIFT) +#define P_AUTO_EOB_SEL_128 (2 << P_AUTO_EOB_SEL_SHIFT) +#define P_AUTO_EOB_SEL_64 (3 << P_AUTO_EOB_SEL_SHIFT) +#define P_PREFETCH_LIMIT_SHIFT 9 +#define P_PREFETCH_LIMIT_32 (0 << P_PREFETCH_LIMIT_SHIFT) +#define P_PREFETCH_LIMIT_16 (1 << P_PREFETCH_LIMIT_SHIFT) +#define P_PREFETCH_LIMIT_4 (2 << P_PREFETCH_LIMIT_SHIFT) +#define P_WRITE_NWD BIT(11) +#define P_LOCK_GROUP_SHIFT 16 +#define P_LOCK_GROUP_MASK 0x1F + +/* BAM_DESC_CNT_TRSHLD */ +#define CNT_TRSHLD 0xffff +#define DEFAULT_CNT_THRSHLD 0x4 + +/* BAM_IRQ_SRCS */ +#define BAM_IRQ BIT(31) +#define P_IRQ 0x7fffffff + +/* BAM_IRQ_SRCS_MSK */ +#define BAM_IRQ_MSK BAM_IRQ +#define P_IRQ_MSK P_IRQ + +/* BAM_IRQ_STTS */ +#define BAM_TIMER_IRQ BIT(4) +#define BAM_EMPTY_IRQ BIT(3) +#define BAM_ERROR_IRQ BIT(2) +#define BAM_HRESP_ERR_IRQ BIT(1) + +/* BAM_IRQ_CLR */ +#define BAM_TIMER_CLR BIT(4) +#define BAM_EMPTY_CLR BIT(3) +#define BAM_ERROR_CLR BIT(2) +#define BAM_HRESP_ERR_CLR BIT(1) + +/* BAM_IRQ_EN */ +#define BAM_TIMER_EN BIT(4) +#define BAM_EMPTY_EN BIT(3) +#define BAM_ERROR_EN BIT(2) +#define BAM_HRESP_ERR_EN BIT(1) + +/* BAM_P_IRQ_EN */ +#define P_PRCSD_DESC_EN BIT(0) +#define P_TIMER_EN BIT(1) +#define P_WAKE_EN BIT(2) +#define P_OUT_OF_DESC_EN BIT(3) +#define P_ERR_EN BIT(4) +#define P_TRNSFR_END_EN BIT(5) +#define P_DEFAULT_IRQS_EN (P_PRCSD_DESC_EN | P_ERR_EN | P_TRNSFR_END_EN) + +/* BAM_P_SW_OFSTS */ +#define P_SW_OFSTS_MASK 0xffff + +#define BAM_DESC_FIFO_SIZE SZ_32K +#define MAX_DESCRIPTORS (BAM_DESC_FIFO_SIZE / sizeof(struct bam_desc_hw) - 1) +#define BAM_MAX_DATA_SIZE (SZ_32K - 8) + +struct bam_chan { + struct virt_dma_chan vc; + + struct bam_device *bdev; + + /* configuration from device tree */ + u32 id; + + struct bam_async_desc *curr_txd; /* current running dma */ + + /* runtime configuration */ + struct dma_slave_config slave; + + /* fifo storage */ + struct bam_desc_hw *fifo_virt; + dma_addr_t fifo_phys; + + /* fifo markers */ + unsigned short head; /* start of active descriptor entries */ + unsigned short tail; /* end of active descriptor entries */ + + unsigned int initialized; /* is the channel hw initialized? */ + unsigned int paused; /* is the channel paused? */ + unsigned int reconfigure; /* new slave config? */ + + struct list_head node; +}; + +static inline struct bam_chan *to_bam_chan(struct dma_chan *common) +{ + return container_of(common, struct bam_chan, vc.chan); +} + +struct bam_device { + void __iomem *regs; + struct device *dev; + struct dma_device common; + struct device_dma_parameters dma_parms; + struct bam_chan *channels; + u32 num_channels; + + /* execution environment ID, from DT */ + u32 ee; + + const struct reg_offset_data *layout; + + struct clk *bamclk; + int irq; + + /* dma start transaction tasklet */ + struct tasklet_struct task; +}; + +/** + * bam_addr - returns BAM register address + * @bdev: bam device + * @pipe: pipe instance (ignored when register doesn't have multiple instances) + * @reg: register enum + */ +static inline void __iomem *bam_addr(struct bam_device *bdev, u32 pipe, + enum bam_reg reg) +{ + const struct reg_offset_data r = bdev->layout[reg]; + + return bdev->regs + r.base_offset + + r.pipe_mult * pipe + + r.evnt_mult * pipe + + r.ee_mult * bdev->ee; +} + +/** + * bam_reset_channel - Reset individual BAM DMA channel + * @bchan: bam channel + * + * This function resets a specific BAM channel + */ +static void bam_reset_channel(struct bam_chan *bchan) +{ + struct bam_device *bdev = bchan->bdev; + + lockdep_assert_held(&bchan->vc.lock); + + /* reset channel */ + writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_RST)); + writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_RST)); + + /* don't allow cpu to reorder BAM register accesses done after this */ + wmb(); + + /* make sure hw is initialized when channel is used the first time */ + bchan->initialized = 0; +} + +/** + * bam_chan_init_hw - Initialize channel hardware + * @bchan: bam channel + * + * This function resets and initializes the BAM channel + */ +static void bam_chan_init_hw(struct bam_chan *bchan, + enum dma_transfer_direction dir) +{ + struct bam_device *bdev = bchan->bdev; + u32 val; + + /* Reset the channel to clear internal state of the FIFO */ + bam_reset_channel(bchan); + + /* + * write out 8 byte aligned address. We have enough space for this + * because we allocated 1 more descriptor (8 bytes) than we can use + */ + writel_relaxed(ALIGN(bchan->fifo_phys, sizeof(struct bam_desc_hw)), + bam_addr(bdev, bchan->id, BAM_P_DESC_FIFO_ADDR)); + writel_relaxed(BAM_DESC_FIFO_SIZE, + bam_addr(bdev, bchan->id, BAM_P_FIFO_SIZES)); + + /* enable the per pipe interrupts, enable EOT, ERR, and INT irqs */ + writel_relaxed(P_DEFAULT_IRQS_EN, + bam_addr(bdev, bchan->id, BAM_P_IRQ_EN)); + + /* unmask the specific pipe and EE combo */ + val = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); + val |= BIT(bchan->id); + writel_relaxed(val, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); + + /* don't allow cpu to reorder the channel enable done below */ + wmb(); + + /* set fixed direction and mode, then enable channel */ + val = P_EN | P_SYS_MODE; + if (dir == DMA_DEV_TO_MEM) + val |= P_DIRECTION; + + writel_relaxed(val, bam_addr(bdev, bchan->id, BAM_P_CTRL)); + + bchan->initialized = 1; + + /* init FIFO pointers */ + bchan->head = 0; + bchan->tail = 0; +} + +/** + * bam_alloc_chan - Allocate channel resources for DMA channel. + * @chan: specified channel + * + * This function allocates the FIFO descriptor memory + */ +static int bam_alloc_chan(struct dma_chan *chan) +{ + struct bam_chan *bchan = to_bam_chan(chan); + struct bam_device *bdev = bchan->bdev; + + if (bchan->fifo_virt) + return 0; + + /* allocate FIFO descriptor space, but only if necessary */ + bchan->fifo_virt = dma_alloc_writecombine(bdev->dev, BAM_DESC_FIFO_SIZE, + &bchan->fifo_phys, GFP_KERNEL); + + if (!bchan->fifo_virt) { + dev_err(bdev->dev, "Failed to allocate desc fifo\n"); + return -ENOMEM; + } + + return 0; +} + +/** + * bam_free_chan - Frees dma resources associated with specific channel + * @chan: specified channel + * + * Free the allocated fifo descriptor memory and channel resources + * + */ +static void bam_free_chan(struct dma_chan *chan) +{ + struct bam_chan *bchan = to_bam_chan(chan); + struct bam_device *bdev = bchan->bdev; + u32 val; + unsigned long flags; + + vchan_free_chan_resources(to_virt_chan(chan)); + + if (bchan->curr_txd) { + dev_err(bchan->bdev->dev, "Cannot free busy channel\n"); + return; + } + + spin_lock_irqsave(&bchan->vc.lock, flags); + bam_reset_channel(bchan); + spin_unlock_irqrestore(&bchan->vc.lock, flags); + + dma_free_writecombine(bdev->dev, BAM_DESC_FIFO_SIZE, bchan->fifo_virt, + bchan->fifo_phys); + bchan->fifo_virt = NULL; + + /* mask irq for pipe/channel */ + val = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); + val &= ~BIT(bchan->id); + writel_relaxed(val, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); + + /* disable irq */ + writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_IRQ_EN)); +} + +/** + * bam_slave_config - set slave configuration for channel + * @chan: dma channel + * @cfg: slave configuration + * + * Sets slave configuration for channel + * + */ +static int bam_slave_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct bam_chan *bchan = to_bam_chan(chan); + unsigned long flag; + + spin_lock_irqsave(&bchan->vc.lock, flag); + memcpy(&bchan->slave, cfg, sizeof(*cfg)); + bchan->reconfigure = 1; + spin_unlock_irqrestore(&bchan->vc.lock, flag); + + return 0; +} + +/** + * bam_prep_slave_sg - Prep slave sg transaction + * + * @chan: dma channel + * @sgl: scatter gather list + * @sg_len: length of sg + * @direction: DMA transfer direction + * @flags: DMA flags + * @context: transfer context (unused) + */ +static struct dma_async_tx_descriptor *bam_prep_slave_sg(struct dma_chan *chan, + struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, + void *context) +{ + struct bam_chan *bchan = to_bam_chan(chan); + struct bam_device *bdev = bchan->bdev; + struct bam_async_desc *async_desc; + struct scatterlist *sg; + u32 i; + struct bam_desc_hw *desc; + unsigned int num_alloc = 0; + + + if (!is_slave_direction(direction)) { + dev_err(bdev->dev, "invalid dma direction\n"); + return NULL; + } + + /* calculate number of required entries */ + for_each_sg(sgl, sg, sg_len, i) + num_alloc += DIV_ROUND_UP(sg_dma_len(sg), BAM_MAX_DATA_SIZE); + + /* allocate enough room to accomodate the number of entries */ + async_desc = kzalloc(sizeof(*async_desc) + + (num_alloc * sizeof(struct bam_desc_hw)), GFP_NOWAIT); + + if (!async_desc) + goto err_out; + + if (flags & DMA_PREP_FENCE) + async_desc->flags |= DESC_FLAG_NWD; + + if (flags & DMA_PREP_INTERRUPT) + async_desc->flags |= DESC_FLAG_EOT; + else + async_desc->flags |= DESC_FLAG_INT; + + async_desc->num_desc = num_alloc; + async_desc->curr_desc = async_desc->desc; + async_desc->dir = direction; + + /* fill in temporary descriptors */ + desc = async_desc->desc; + for_each_sg(sgl, sg, sg_len, i) { + unsigned int remainder = sg_dma_len(sg); + unsigned int curr_offset = 0; + + do { + desc->addr = sg_dma_address(sg) + curr_offset; + + if (remainder > BAM_MAX_DATA_SIZE) { + desc->size = BAM_MAX_DATA_SIZE; + remainder -= BAM_MAX_DATA_SIZE; + curr_offset += BAM_MAX_DATA_SIZE; + } else { + desc->size = remainder; + remainder = 0; + } + + async_desc->length += desc->size; + desc++; + } while (remainder > 0); + } + + return vchan_tx_prep(&bchan->vc, &async_desc->vd, flags); + +err_out: + kfree(async_desc); + return NULL; +} + +/** + * bam_dma_terminate_all - terminate all transactions on a channel + * @bchan: bam dma channel + * + * Dequeues and frees all transactions + * No callbacks are done + * + */ +static int bam_dma_terminate_all(struct dma_chan *chan) +{ + struct bam_chan *bchan = to_bam_chan(chan); + unsigned long flag; + LIST_HEAD(head); + + /* remove all transactions, including active transaction */ + spin_lock_irqsave(&bchan->vc.lock, flag); + if (bchan->curr_txd) { + list_add(&bchan->curr_txd->vd.node, &bchan->vc.desc_issued); + bchan->curr_txd = NULL; + } + + vchan_get_all_descriptors(&bchan->vc, &head); + spin_unlock_irqrestore(&bchan->vc.lock, flag); + + vchan_dma_desc_free_list(&bchan->vc, &head); + + return 0; +} + +/** + * bam_pause - Pause DMA channel + * @chan: dma channel + * + */ +static int bam_pause(struct dma_chan *chan) +{ + struct bam_chan *bchan = to_bam_chan(chan); + struct bam_device *bdev = bchan->bdev; + unsigned long flag; + + spin_lock_irqsave(&bchan->vc.lock, flag); + writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_HALT)); + bchan->paused = 1; + spin_unlock_irqrestore(&bchan->vc.lock, flag); + + return 0; +} + +/** + * bam_resume - Resume DMA channel operations + * @chan: dma channel + * + */ +static int bam_resume(struct dma_chan *chan) +{ + struct bam_chan *bchan = to_bam_chan(chan); + struct bam_device *bdev = bchan->bdev; + unsigned long flag; + + spin_lock_irqsave(&bchan->vc.lock, flag); + writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_HALT)); + bchan->paused = 0; + spin_unlock_irqrestore(&bchan->vc.lock, flag); + + return 0; +} + +/** + * process_channel_irqs - processes the channel interrupts + * @bdev: bam controller + * + * This function processes the channel interrupts + * + */ +static u32 process_channel_irqs(struct bam_device *bdev) +{ + u32 i, srcs, pipe_stts; + unsigned long flags; + struct bam_async_desc *async_desc; + + srcs = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_EE)); + + /* return early if no pipe/channel interrupts are present */ + if (!(srcs & P_IRQ)) + return srcs; + + for (i = 0; i < bdev->num_channels; i++) { + struct bam_chan *bchan = &bdev->channels[i]; + + if (!(srcs & BIT(i))) + continue; + + /* clear pipe irq */ + pipe_stts = readl_relaxed(bam_addr(bdev, i, BAM_P_IRQ_STTS)); + + writel_relaxed(pipe_stts, bam_addr(bdev, i, BAM_P_IRQ_CLR)); + + spin_lock_irqsave(&bchan->vc.lock, flags); + async_desc = bchan->curr_txd; + + if (async_desc) { + async_desc->num_desc -= async_desc->xfer_len; + async_desc->curr_desc += async_desc->xfer_len; + bchan->curr_txd = NULL; + + /* manage FIFO */ + bchan->head += async_desc->xfer_len; + bchan->head %= MAX_DESCRIPTORS; + + /* + * if complete, process cookie. Otherwise + * push back to front of desc_issued so that + * it gets restarted by the tasklet + */ + if (!async_desc->num_desc) + vchan_cookie_complete(&async_desc->vd); + else + list_add(&async_desc->vd.node, + &bchan->vc.desc_issued); + } + + spin_unlock_irqrestore(&bchan->vc.lock, flags); + } + + return srcs; +} + +/** + * bam_dma_irq - irq handler for bam controller + * @irq: IRQ of interrupt + * @data: callback data + * + * IRQ handler for the bam controller + */ +static irqreturn_t bam_dma_irq(int irq, void *data) +{ + struct bam_device *bdev = data; + u32 clr_mask = 0, srcs = 0; + + srcs |= process_channel_irqs(bdev); + + /* kick off tasklet to start next dma transfer */ + if (srcs & P_IRQ) + tasklet_schedule(&bdev->task); + + if (srcs & BAM_IRQ) + clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS)); + + /* don't allow reorder of the various accesses to the BAM registers */ + mb(); + + writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR)); + + return IRQ_HANDLED; +} + +/** + * bam_tx_status - returns status of transaction + * @chan: dma channel + * @cookie: transaction cookie + * @txstate: DMA transaction state + * + * Return status of dma transaction + */ +static enum dma_status bam_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct bam_chan *bchan = to_bam_chan(chan); + struct virt_dma_desc *vd; + int ret; + size_t residue = 0; + unsigned int i; + unsigned long flags; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + if (!txstate) + return bchan->paused ? DMA_PAUSED : ret; + + spin_lock_irqsave(&bchan->vc.lock, flags); + vd = vchan_find_desc(&bchan->vc, cookie); + if (vd) + residue = container_of(vd, struct bam_async_desc, vd)->length; + else if (bchan->curr_txd && bchan->curr_txd->vd.tx.cookie == cookie) + for (i = 0; i < bchan->curr_txd->num_desc; i++) + residue += bchan->curr_txd->curr_desc[i].size; + + spin_unlock_irqrestore(&bchan->vc.lock, flags); + + dma_set_residue(txstate, residue); + + if (ret == DMA_IN_PROGRESS && bchan->paused) + ret = DMA_PAUSED; + + return ret; +} + +/** + * bam_apply_new_config + * @bchan: bam dma channel + * @dir: DMA direction + */ +static void bam_apply_new_config(struct bam_chan *bchan, + enum dma_transfer_direction dir) +{ + struct bam_device *bdev = bchan->bdev; + u32 maxburst; + + if (dir == DMA_DEV_TO_MEM) + maxburst = bchan->slave.src_maxburst; + else + maxburst = bchan->slave.dst_maxburst; + + writel_relaxed(maxburst, bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD)); + + bchan->reconfigure = 0; +} + +/** + * bam_start_dma - start next transaction + * @bchan - bam dma channel + */ +static void bam_start_dma(struct bam_chan *bchan) +{ + struct virt_dma_desc *vd = vchan_next_desc(&bchan->vc); + struct bam_device *bdev = bchan->bdev; + struct bam_async_desc *async_desc; + struct bam_desc_hw *desc; + struct bam_desc_hw *fifo = PTR_ALIGN(bchan->fifo_virt, + sizeof(struct bam_desc_hw)); + + lockdep_assert_held(&bchan->vc.lock); + + if (!vd) + return; + + list_del(&vd->node); + + async_desc = container_of(vd, struct bam_async_desc, vd); + bchan->curr_txd = async_desc; + + /* on first use, initialize the channel hardware */ + if (!bchan->initialized) + bam_chan_init_hw(bchan, async_desc->dir); + + /* apply new slave config changes, if necessary */ + if (bchan->reconfigure) + bam_apply_new_config(bchan, async_desc->dir); + + desc = bchan->curr_txd->curr_desc; + + if (async_desc->num_desc > MAX_DESCRIPTORS) + async_desc->xfer_len = MAX_DESCRIPTORS; + else + async_desc->xfer_len = async_desc->num_desc; + + /* set any special flags on the last descriptor */ + if (async_desc->num_desc == async_desc->xfer_len) + desc[async_desc->xfer_len - 1].flags = async_desc->flags; + else + desc[async_desc->xfer_len - 1].flags |= DESC_FLAG_INT; + + if (bchan->tail + async_desc->xfer_len > MAX_DESCRIPTORS) { + u32 partial = MAX_DESCRIPTORS - bchan->tail; + + memcpy(&fifo[bchan->tail], desc, + partial * sizeof(struct bam_desc_hw)); + memcpy(fifo, &desc[partial], (async_desc->xfer_len - partial) * + sizeof(struct bam_desc_hw)); + } else { + memcpy(&fifo[bchan->tail], desc, + async_desc->xfer_len * sizeof(struct bam_desc_hw)); + } + + bchan->tail += async_desc->xfer_len; + bchan->tail %= MAX_DESCRIPTORS; + + /* ensure descriptor writes and dma start not reordered */ + wmb(); + writel_relaxed(bchan->tail * sizeof(struct bam_desc_hw), + bam_addr(bdev, bchan->id, BAM_P_EVNT_REG)); +} + +/** + * dma_tasklet - DMA IRQ tasklet + * @data: tasklet argument (bam controller structure) + * + * Sets up next DMA operation and then processes all completed transactions + */ +static void dma_tasklet(unsigned long data) +{ + struct bam_device *bdev = (struct bam_device *)data; + struct bam_chan *bchan; + unsigned long flags; + unsigned int i; + + /* go through the channels and kick off transactions */ + for (i = 0; i < bdev->num_channels; i++) { + bchan = &bdev->channels[i]; + spin_lock_irqsave(&bchan->vc.lock, flags); + + if (!list_empty(&bchan->vc.desc_issued) && !bchan->curr_txd) + bam_start_dma(bchan); + spin_unlock_irqrestore(&bchan->vc.lock, flags); + } +} + +/** + * bam_issue_pending - starts pending transactions + * @chan: dma channel + * + * Calls tasklet directly which in turn starts any pending transactions + */ +static void bam_issue_pending(struct dma_chan *chan) +{ + struct bam_chan *bchan = to_bam_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&bchan->vc.lock, flags); + + /* if work pending and idle, start a transaction */ + if (vchan_issue_pending(&bchan->vc) && !bchan->curr_txd) + bam_start_dma(bchan); + + spin_unlock_irqrestore(&bchan->vc.lock, flags); +} + +/** + * bam_dma_free_desc - free descriptor memory + * @vd: virtual descriptor + * + */ +static void bam_dma_free_desc(struct virt_dma_desc *vd) +{ + struct bam_async_desc *async_desc = container_of(vd, + struct bam_async_desc, vd); + + kfree(async_desc); +} + +static struct dma_chan *bam_dma_xlate(struct of_phandle_args *dma_spec, + struct of_dma *of) +{ + struct bam_device *bdev = container_of(of->of_dma_data, + struct bam_device, common); + unsigned int request; + + if (dma_spec->args_count != 1) + return NULL; + + request = dma_spec->args[0]; + if (request >= bdev->num_channels) + return NULL; + + return dma_get_slave_channel(&(bdev->channels[request].vc.chan)); +} + +/** + * bam_init + * @bdev: bam device + * + * Initialization helper for global bam registers + */ +static int bam_init(struct bam_device *bdev) +{ + u32 val; + + /* read revision and configuration information */ + val = readl_relaxed(bam_addr(bdev, 0, BAM_REVISION)) >> NUM_EES_SHIFT; + val &= NUM_EES_MASK; + + /* check that configured EE is within range */ + if (bdev->ee >= val) + return -EINVAL; + + val = readl_relaxed(bam_addr(bdev, 0, BAM_NUM_PIPES)); + bdev->num_channels = val & BAM_NUM_PIPES_MASK; + + /* s/w reset bam */ + /* after reset all pipes are disabled and idle */ + val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL)); + val |= BAM_SW_RST; + writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL)); + val &= ~BAM_SW_RST; + writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL)); + + /* make sure previous stores are visible before enabling BAM */ + wmb(); + + /* enable bam */ + val |= BAM_EN; + writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL)); + + /* set descriptor threshhold, start with 4 bytes */ + writel_relaxed(DEFAULT_CNT_THRSHLD, + bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD)); + + /* Enable default set of h/w workarounds, ie all except BAM_FULL_PIPE */ + writel_relaxed(BAM_CNFG_BITS_DEFAULT, bam_addr(bdev, 0, BAM_CNFG_BITS)); + + /* enable irqs for errors */ + writel_relaxed(BAM_ERROR_EN | BAM_HRESP_ERR_EN, + bam_addr(bdev, 0, BAM_IRQ_EN)); + + /* unmask global bam interrupt */ + writel_relaxed(BAM_IRQ_MSK, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); + + return 0; +} + +static void bam_channel_init(struct bam_device *bdev, struct bam_chan *bchan, + u32 index) +{ + bchan->id = index; + bchan->bdev = bdev; + + vchan_init(&bchan->vc, &bdev->common); + bchan->vc.desc_free = bam_dma_free_desc; +} + +static const struct of_device_id bam_of_match[] = { + { .compatible = "qcom,bam-v1.3.0", .data = &bam_v1_3_reg_info }, + { .compatible = "qcom,bam-v1.4.0", .data = &bam_v1_4_reg_info }, + { .compatible = "qcom,bam-v1.7.0", .data = &bam_v1_7_reg_info }, + {} +}; + +MODULE_DEVICE_TABLE(of, bam_of_match); + +static int bam_dma_probe(struct platform_device *pdev) +{ + struct bam_device *bdev; + const struct of_device_id *match; + struct resource *iores; + int ret, i; + + bdev = devm_kzalloc(&pdev->dev, sizeof(*bdev), GFP_KERNEL); + if (!bdev) + return -ENOMEM; + + bdev->dev = &pdev->dev; + + match = of_match_node(bam_of_match, pdev->dev.of_node); + if (!match) { + dev_err(&pdev->dev, "Unsupported BAM module\n"); + return -ENODEV; + } + + bdev->layout = match->data; + + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + bdev->regs = devm_ioremap_resource(&pdev->dev, iores); + if (IS_ERR(bdev->regs)) + return PTR_ERR(bdev->regs); + + bdev->irq = platform_get_irq(pdev, 0); + if (bdev->irq < 0) + return bdev->irq; + + ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &bdev->ee); + if (ret) { + dev_err(bdev->dev, "Execution environment unspecified\n"); + return ret; + } + + bdev->bamclk = devm_clk_get(bdev->dev, "bam_clk"); + if (IS_ERR(bdev->bamclk)) + return PTR_ERR(bdev->bamclk); + + ret = clk_prepare_enable(bdev->bamclk); + if (ret) { + dev_err(bdev->dev, "failed to prepare/enable clock\n"); + return ret; + } + + ret = bam_init(bdev); + if (ret) + goto err_disable_clk; + + tasklet_init(&bdev->task, dma_tasklet, (unsigned long)bdev); + + bdev->channels = devm_kcalloc(bdev->dev, bdev->num_channels, + sizeof(*bdev->channels), GFP_KERNEL); + + if (!bdev->channels) { + ret = -ENOMEM; + goto err_tasklet_kill; + } + + /* allocate and initialize channels */ + INIT_LIST_HEAD(&bdev->common.channels); + + for (i = 0; i < bdev->num_channels; i++) + bam_channel_init(bdev, &bdev->channels[i], i); + + ret = devm_request_irq(bdev->dev, bdev->irq, bam_dma_irq, + IRQF_TRIGGER_HIGH, "bam_dma", bdev); + if (ret) + goto err_bam_channel_exit; + + /* set max dma segment size */ + bdev->common.dev = bdev->dev; + bdev->common.dev->dma_parms = &bdev->dma_parms; + ret = dma_set_max_seg_size(bdev->common.dev, BAM_MAX_DATA_SIZE); + if (ret) { + dev_err(bdev->dev, "cannot set maximum segment size\n"); + goto err_bam_channel_exit; + } + + platform_set_drvdata(pdev, bdev); + + /* set capabilities */ + dma_cap_zero(bdev->common.cap_mask); + dma_cap_set(DMA_SLAVE, bdev->common.cap_mask); + + /* initialize dmaengine apis */ + bdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + bdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; + bdev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES; + bdev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES; + bdev->common.device_alloc_chan_resources = bam_alloc_chan; + bdev->common.device_free_chan_resources = bam_free_chan; + bdev->common.device_prep_slave_sg = bam_prep_slave_sg; + bdev->common.device_config = bam_slave_config; + bdev->common.device_pause = bam_pause; + bdev->common.device_resume = bam_resume; + bdev->common.device_terminate_all = bam_dma_terminate_all; + bdev->common.device_issue_pending = bam_issue_pending; + bdev->common.device_tx_status = bam_tx_status; + bdev->common.dev = bdev->dev; + + ret = dma_async_device_register(&bdev->common); + if (ret) { + dev_err(bdev->dev, "failed to register dma async device\n"); + goto err_bam_channel_exit; + } + + ret = of_dma_controller_register(pdev->dev.of_node, bam_dma_xlate, + &bdev->common); + if (ret) + goto err_unregister_dma; + + return 0; + +err_unregister_dma: + dma_async_device_unregister(&bdev->common); +err_bam_channel_exit: + for (i = 0; i < bdev->num_channels; i++) + tasklet_kill(&bdev->channels[i].vc.task); +err_tasklet_kill: + tasklet_kill(&bdev->task); +err_disable_clk: + clk_disable_unprepare(bdev->bamclk); + + return ret; +} + +static int bam_dma_remove(struct platform_device *pdev) +{ + struct bam_device *bdev = platform_get_drvdata(pdev); + u32 i; + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&bdev->common); + + /* mask all interrupts for this execution environment */ + writel_relaxed(0, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); + + devm_free_irq(bdev->dev, bdev->irq, bdev); + + for (i = 0; i < bdev->num_channels; i++) { + bam_dma_terminate_all(&bdev->channels[i].vc.chan); + tasklet_kill(&bdev->channels[i].vc.task); + + dma_free_writecombine(bdev->dev, BAM_DESC_FIFO_SIZE, + bdev->channels[i].fifo_virt, + bdev->channels[i].fifo_phys); + } + + tasklet_kill(&bdev->task); + + clk_disable_unprepare(bdev->bamclk); + + return 0; +} + +static struct platform_driver bam_dma_driver = { + .probe = bam_dma_probe, + .remove = bam_dma_remove, + .driver = { + .name = "bam-dma-engine", + .of_match_table = bam_of_match, + }, +}; + +module_platform_driver(bam_dma_driver); + +MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>"); +MODULE_DESCRIPTION("QCOM BAM DMA engine driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/s3c24xx-dma.c b/drivers/dma/s3c24xx-dma.c new file mode 100644 index 000000000..01dcaf21b --- /dev/null +++ b/drivers/dma/s3c24xx-dma.c @@ -0,0 +1,1418 @@ +/* + * S3C24XX DMA handling + * + * Copyright (c) 2013 Heiko Stuebner <heiko@sntech.de> + * + * based on amba-pl08x.c + * + * Copyright (c) 2006 ARM Ltd. + * Copyright (c) 2010 ST-Ericsson SA + * + * Author: Peter Pearse <peter.pearse@arm.com> + * Author: Linus Walleij <linus.walleij@stericsson.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the Free + * Software Foundation; either version 2 of the License, or (at your option) + * any later version. + * + * The DMA controllers in S3C24XX SoCs have a varying number of DMA signals + * that can be routed to any of the 4 to 8 hardware-channels. + * + * Therefore on these DMA controllers the number of channels + * and the number of incoming DMA signals are two totally different things. + * It is usually not possible to theoretically handle all physical signals, + * so a multiplexing scheme with possible denial of use is necessary. + * + * Open items: + * - bursts + */ + +#include <linux/platform_device.h> +#include <linux/types.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/clk.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/platform_data/dma-s3c24xx.h> + +#include "dmaengine.h" +#include "virt-dma.h" + +#define MAX_DMA_CHANNELS 8 + +#define S3C24XX_DISRC 0x00 +#define S3C24XX_DISRCC 0x04 +#define S3C24XX_DISRCC_INC_INCREMENT 0 +#define S3C24XX_DISRCC_INC_FIXED BIT(0) +#define S3C24XX_DISRCC_LOC_AHB 0 +#define S3C24XX_DISRCC_LOC_APB BIT(1) + +#define S3C24XX_DIDST 0x08 +#define S3C24XX_DIDSTC 0x0c +#define S3C24XX_DIDSTC_INC_INCREMENT 0 +#define S3C24XX_DIDSTC_INC_FIXED BIT(0) +#define S3C24XX_DIDSTC_LOC_AHB 0 +#define S3C24XX_DIDSTC_LOC_APB BIT(1) +#define S3C24XX_DIDSTC_INT_TC0 0 +#define S3C24XX_DIDSTC_INT_RELOAD BIT(2) + +#define S3C24XX_DCON 0x10 + +#define S3C24XX_DCON_TC_MASK 0xfffff +#define S3C24XX_DCON_DSZ_BYTE (0 << 20) +#define S3C24XX_DCON_DSZ_HALFWORD (1 << 20) +#define S3C24XX_DCON_DSZ_WORD (2 << 20) +#define S3C24XX_DCON_DSZ_MASK (3 << 20) +#define S3C24XX_DCON_DSZ_SHIFT 20 +#define S3C24XX_DCON_AUTORELOAD 0 +#define S3C24XX_DCON_NORELOAD BIT(22) +#define S3C24XX_DCON_HWTRIG BIT(23) +#define S3C24XX_DCON_HWSRC_SHIFT 24 +#define S3C24XX_DCON_SERV_SINGLE 0 +#define S3C24XX_DCON_SERV_WHOLE BIT(27) +#define S3C24XX_DCON_TSZ_UNIT 0 +#define S3C24XX_DCON_TSZ_BURST4 BIT(28) +#define S3C24XX_DCON_INT BIT(29) +#define S3C24XX_DCON_SYNC_PCLK 0 +#define S3C24XX_DCON_SYNC_HCLK BIT(30) +#define S3C24XX_DCON_DEMAND 0 +#define S3C24XX_DCON_HANDSHAKE BIT(31) + +#define S3C24XX_DSTAT 0x14 +#define S3C24XX_DSTAT_STAT_BUSY BIT(20) +#define S3C24XX_DSTAT_CURRTC_MASK 0xfffff + +#define S3C24XX_DMASKTRIG 0x20 +#define S3C24XX_DMASKTRIG_SWTRIG BIT(0) +#define S3C24XX_DMASKTRIG_ON BIT(1) +#define S3C24XX_DMASKTRIG_STOP BIT(2) + +#define S3C24XX_DMAREQSEL 0x24 +#define S3C24XX_DMAREQSEL_HW BIT(0) + +/* + * S3C2410, S3C2440 and S3C2442 SoCs cannot select any physical channel + * for a DMA source. Instead only specific channels are valid. + * All of these SoCs have 4 physical channels and the number of request + * source bits is 3. Additionally we also need 1 bit to mark the channel + * as valid. + * Therefore we separate the chansel element of the channel data into 4 + * parts of 4 bits each, to hold the information if the channel is valid + * and the hw request source to use. + * + * Example: + * SDI is valid on channels 0, 2 and 3 - with varying hw request sources. + * For it the chansel field would look like + * + * ((BIT(3) | 1) << 3 * 4) | // channel 3, with request source 1 + * ((BIT(3) | 2) << 2 * 4) | // channel 2, with request source 2 + * ((BIT(3) | 2) << 0 * 4) // channel 0, with request source 2 + */ +#define S3C24XX_CHANSEL_WIDTH 4 +#define S3C24XX_CHANSEL_VALID BIT(3) +#define S3C24XX_CHANSEL_REQ_MASK 7 + +/* + * struct soc_data - vendor-specific config parameters for individual SoCs + * @stride: spacing between the registers of each channel + * @has_reqsel: does the controller use the newer requestselection mechanism + * @has_clocks: are controllable dma-clocks present + */ +struct soc_data { + int stride; + bool has_reqsel; + bool has_clocks; +}; + +/* + * enum s3c24xx_dma_chan_state - holds the virtual channel states + * @S3C24XX_DMA_CHAN_IDLE: the channel is idle + * @S3C24XX_DMA_CHAN_RUNNING: the channel has allocated a physical transport + * channel and is running a transfer on it + * @S3C24XX_DMA_CHAN_WAITING: the channel is waiting for a physical transport + * channel to become available (only pertains to memcpy channels) + */ +enum s3c24xx_dma_chan_state { + S3C24XX_DMA_CHAN_IDLE, + S3C24XX_DMA_CHAN_RUNNING, + S3C24XX_DMA_CHAN_WAITING, +}; + +/* + * struct s3c24xx_sg - structure containing data per sg + * @src_addr: src address of sg + * @dst_addr: dst address of sg + * @len: transfer len in bytes + * @node: node for txd's dsg_list + */ +struct s3c24xx_sg { + dma_addr_t src_addr; + dma_addr_t dst_addr; + size_t len; + struct list_head node; +}; + +/* + * struct s3c24xx_txd - wrapper for struct dma_async_tx_descriptor + * @vd: virtual DMA descriptor + * @dsg_list: list of children sg's + * @at: sg currently being transfered + * @width: transfer width + * @disrcc: value for source control register + * @didstc: value for destination control register + * @dcon: base value for dcon register + * @cyclic: indicate cyclic transfer + */ +struct s3c24xx_txd { + struct virt_dma_desc vd; + struct list_head dsg_list; + struct list_head *at; + u8 width; + u32 disrcc; + u32 didstc; + u32 dcon; + bool cyclic; +}; + +struct s3c24xx_dma_chan; + +/* + * struct s3c24xx_dma_phy - holder for the physical channels + * @id: physical index to this channel + * @valid: does the channel have all required elements + * @base: virtual memory base (remapped) for the this channel + * @irq: interrupt for this channel + * @clk: clock for this channel + * @lock: a lock to use when altering an instance of this struct + * @serving: virtual channel currently being served by this physicalchannel + * @host: a pointer to the host (internal use) + */ +struct s3c24xx_dma_phy { + unsigned int id; + bool valid; + void __iomem *base; + int irq; + struct clk *clk; + spinlock_t lock; + struct s3c24xx_dma_chan *serving; + struct s3c24xx_dma_engine *host; +}; + +/* + * struct s3c24xx_dma_chan - this structure wraps a DMA ENGINE channel + * @id: the id of the channel + * @name: name of the channel + * @vc: wrappped virtual channel + * @phy: the physical channel utilized by this channel, if there is one + * @runtime_addr: address for RX/TX according to the runtime config + * @at: active transaction on this channel + * @lock: a lock for this channel data + * @host: a pointer to the host (internal use) + * @state: whether the channel is idle, running etc + * @slave: whether this channel is a device (slave) or for memcpy + */ +struct s3c24xx_dma_chan { + int id; + const char *name; + struct virt_dma_chan vc; + struct s3c24xx_dma_phy *phy; + struct dma_slave_config cfg; + struct s3c24xx_txd *at; + struct s3c24xx_dma_engine *host; + enum s3c24xx_dma_chan_state state; + bool slave; +}; + +/* + * struct s3c24xx_dma_engine - the local state holder for the S3C24XX + * @pdev: the corresponding platform device + * @pdata: platform data passed in from the platform/machine + * @base: virtual memory base (remapped) + * @slave: slave engine for this instance + * @memcpy: memcpy engine for this instance + * @phy_chans: array of data for the physical channels + */ +struct s3c24xx_dma_engine { + struct platform_device *pdev; + const struct s3c24xx_dma_platdata *pdata; + struct soc_data *sdata; + void __iomem *base; + struct dma_device slave; + struct dma_device memcpy; + struct s3c24xx_dma_phy *phy_chans; +}; + +/* + * Physical channel handling + */ + +/* + * Check whether a certain channel is busy or not. + */ +static int s3c24xx_dma_phy_busy(struct s3c24xx_dma_phy *phy) +{ + unsigned int val = readl(phy->base + S3C24XX_DSTAT); + return val & S3C24XX_DSTAT_STAT_BUSY; +} + +static bool s3c24xx_dma_phy_valid(struct s3c24xx_dma_chan *s3cchan, + struct s3c24xx_dma_phy *phy) +{ + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; + struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id]; + int phyvalid; + + /* every phy is valid for memcopy channels */ + if (!s3cchan->slave) + return true; + + /* On newer variants all phys can be used for all virtual channels */ + if (s3cdma->sdata->has_reqsel) + return true; + + phyvalid = (cdata->chansel >> (phy->id * S3C24XX_CHANSEL_WIDTH)); + return (phyvalid & S3C24XX_CHANSEL_VALID) ? true : false; +} + +/* + * Allocate a physical channel for a virtual channel + * + * Try to locate a physical channel to be used for this transfer. If all + * are taken return NULL and the requester will have to cope by using + * some fallback PIO mode or retrying later. + */ +static +struct s3c24xx_dma_phy *s3c24xx_dma_get_phy(struct s3c24xx_dma_chan *s3cchan) +{ + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; + struct s3c24xx_dma_channel *cdata; + struct s3c24xx_dma_phy *phy = NULL; + unsigned long flags; + int i; + int ret; + + if (s3cchan->slave) + cdata = &pdata->channels[s3cchan->id]; + + for (i = 0; i < s3cdma->pdata->num_phy_channels; i++) { + phy = &s3cdma->phy_chans[i]; + + if (!phy->valid) + continue; + + if (!s3c24xx_dma_phy_valid(s3cchan, phy)) + continue; + + spin_lock_irqsave(&phy->lock, flags); + + if (!phy->serving) { + phy->serving = s3cchan; + spin_unlock_irqrestore(&phy->lock, flags); + break; + } + + spin_unlock_irqrestore(&phy->lock, flags); + } + + /* No physical channel available, cope with it */ + if (i == s3cdma->pdata->num_phy_channels) { + dev_warn(&s3cdma->pdev->dev, "no phy channel available\n"); + return NULL; + } + + /* start the phy clock */ + if (s3cdma->sdata->has_clocks) { + ret = clk_enable(phy->clk); + if (ret) { + dev_err(&s3cdma->pdev->dev, "could not enable clock for channel %d, err %d\n", + phy->id, ret); + phy->serving = NULL; + return NULL; + } + } + + return phy; +} + +/* + * Mark the physical channel as free. + * + * This drops the link between the physical and virtual channel. + */ +static inline void s3c24xx_dma_put_phy(struct s3c24xx_dma_phy *phy) +{ + struct s3c24xx_dma_engine *s3cdma = phy->host; + + if (s3cdma->sdata->has_clocks) + clk_disable(phy->clk); + + phy->serving = NULL; +} + +/* + * Stops the channel by writing the stop bit. + * This should not be used for an on-going transfer, but as a method of + * shutting down a channel (eg, when it's no longer used) or terminating a + * transfer. + */ +static void s3c24xx_dma_terminate_phy(struct s3c24xx_dma_phy *phy) +{ + writel(S3C24XX_DMASKTRIG_STOP, phy->base + S3C24XX_DMASKTRIG); +} + +/* + * Virtual channel handling + */ + +static inline +struct s3c24xx_dma_chan *to_s3c24xx_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct s3c24xx_dma_chan, vc.chan); +} + +static u32 s3c24xx_dma_getbytes_chan(struct s3c24xx_dma_chan *s3cchan) +{ + struct s3c24xx_dma_phy *phy = s3cchan->phy; + struct s3c24xx_txd *txd = s3cchan->at; + u32 tc = readl(phy->base + S3C24XX_DSTAT) & S3C24XX_DSTAT_CURRTC_MASK; + + return tc * txd->width; +} + +static int s3c24xx_dma_set_runtime_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); + unsigned long flags; + int ret = 0; + + /* Reject definitely invalid configurations */ + if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || + config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) + return -EINVAL; + + spin_lock_irqsave(&s3cchan->vc.lock, flags); + + if (!s3cchan->slave) { + ret = -EINVAL; + goto out; + } + + s3cchan->cfg = *config; + +out: + spin_unlock_irqrestore(&s3cchan->vc.lock, flags); + return ret; +} + +/* + * Transfer handling + */ + +static inline +struct s3c24xx_txd *to_s3c24xx_txd(struct dma_async_tx_descriptor *tx) +{ + return container_of(tx, struct s3c24xx_txd, vd.tx); +} + +static struct s3c24xx_txd *s3c24xx_dma_get_txd(void) +{ + struct s3c24xx_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); + + if (txd) { + INIT_LIST_HEAD(&txd->dsg_list); + txd->dcon = S3C24XX_DCON_INT | S3C24XX_DCON_NORELOAD; + } + + return txd; +} + +static void s3c24xx_dma_free_txd(struct s3c24xx_txd *txd) +{ + struct s3c24xx_sg *dsg, *_dsg; + + list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { + list_del(&dsg->node); + kfree(dsg); + } + + kfree(txd); +} + +static void s3c24xx_dma_start_next_sg(struct s3c24xx_dma_chan *s3cchan, + struct s3c24xx_txd *txd) +{ + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + struct s3c24xx_dma_phy *phy = s3cchan->phy; + const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; + struct s3c24xx_sg *dsg = list_entry(txd->at, struct s3c24xx_sg, node); + u32 dcon = txd->dcon; + u32 val; + + /* transfer-size and -count from len and width */ + switch (txd->width) { + case 1: + dcon |= S3C24XX_DCON_DSZ_BYTE | dsg->len; + break; + case 2: + dcon |= S3C24XX_DCON_DSZ_HALFWORD | (dsg->len / 2); + break; + case 4: + dcon |= S3C24XX_DCON_DSZ_WORD | (dsg->len / 4); + break; + } + + if (s3cchan->slave) { + struct s3c24xx_dma_channel *cdata = + &pdata->channels[s3cchan->id]; + + if (s3cdma->sdata->has_reqsel) { + writel_relaxed((cdata->chansel << 1) | + S3C24XX_DMAREQSEL_HW, + phy->base + S3C24XX_DMAREQSEL); + } else { + int csel = cdata->chansel >> (phy->id * + S3C24XX_CHANSEL_WIDTH); + + csel &= S3C24XX_CHANSEL_REQ_MASK; + dcon |= csel << S3C24XX_DCON_HWSRC_SHIFT; + dcon |= S3C24XX_DCON_HWTRIG; + } + } else { + if (s3cdma->sdata->has_reqsel) + writel_relaxed(0, phy->base + S3C24XX_DMAREQSEL); + } + + writel_relaxed(dsg->src_addr, phy->base + S3C24XX_DISRC); + writel_relaxed(txd->disrcc, phy->base + S3C24XX_DISRCC); + writel_relaxed(dsg->dst_addr, phy->base + S3C24XX_DIDST); + writel_relaxed(txd->didstc, phy->base + S3C24XX_DIDSTC); + writel_relaxed(dcon, phy->base + S3C24XX_DCON); + + val = readl_relaxed(phy->base + S3C24XX_DMASKTRIG); + val &= ~S3C24XX_DMASKTRIG_STOP; + val |= S3C24XX_DMASKTRIG_ON; + + /* trigger the dma operation for memcpy transfers */ + if (!s3cchan->slave) + val |= S3C24XX_DMASKTRIG_SWTRIG; + + writel(val, phy->base + S3C24XX_DMASKTRIG); +} + +/* + * Set the initial DMA register values and start first sg. + */ +static void s3c24xx_dma_start_next_txd(struct s3c24xx_dma_chan *s3cchan) +{ + struct s3c24xx_dma_phy *phy = s3cchan->phy; + struct virt_dma_desc *vd = vchan_next_desc(&s3cchan->vc); + struct s3c24xx_txd *txd = to_s3c24xx_txd(&vd->tx); + + list_del(&txd->vd.node); + + s3cchan->at = txd; + + /* Wait for channel inactive */ + while (s3c24xx_dma_phy_busy(phy)) + cpu_relax(); + + /* point to the first element of the sg list */ + txd->at = txd->dsg_list.next; + s3c24xx_dma_start_next_sg(s3cchan, txd); +} + +static void s3c24xx_dma_free_txd_list(struct s3c24xx_dma_engine *s3cdma, + struct s3c24xx_dma_chan *s3cchan) +{ + LIST_HEAD(head); + + vchan_get_all_descriptors(&s3cchan->vc, &head); + vchan_dma_desc_free_list(&s3cchan->vc, &head); +} + +/* + * Try to allocate a physical channel. When successful, assign it to + * this virtual channel, and initiate the next descriptor. The + * virtual channel lock must be held at this point. + */ +static void s3c24xx_dma_phy_alloc_and_start(struct s3c24xx_dma_chan *s3cchan) +{ + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + struct s3c24xx_dma_phy *phy; + + phy = s3c24xx_dma_get_phy(s3cchan); + if (!phy) { + dev_dbg(&s3cdma->pdev->dev, "no physical channel available for xfer on %s\n", + s3cchan->name); + s3cchan->state = S3C24XX_DMA_CHAN_WAITING; + return; + } + + dev_dbg(&s3cdma->pdev->dev, "allocated physical channel %d for xfer on %s\n", + phy->id, s3cchan->name); + + s3cchan->phy = phy; + s3cchan->state = S3C24XX_DMA_CHAN_RUNNING; + + s3c24xx_dma_start_next_txd(s3cchan); +} + +static void s3c24xx_dma_phy_reassign_start(struct s3c24xx_dma_phy *phy, + struct s3c24xx_dma_chan *s3cchan) +{ + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + + dev_dbg(&s3cdma->pdev->dev, "reassigned physical channel %d for xfer on %s\n", + phy->id, s3cchan->name); + + /* + * We do this without taking the lock; we're really only concerned + * about whether this pointer is NULL or not, and we're guaranteed + * that this will only be called when it _already_ is non-NULL. + */ + phy->serving = s3cchan; + s3cchan->phy = phy; + s3cchan->state = S3C24XX_DMA_CHAN_RUNNING; + s3c24xx_dma_start_next_txd(s3cchan); +} + +/* + * Free a physical DMA channel, potentially reallocating it to another + * virtual channel if we have any pending. + */ +static void s3c24xx_dma_phy_free(struct s3c24xx_dma_chan *s3cchan) +{ + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + struct s3c24xx_dma_chan *p, *next; + +retry: + next = NULL; + + /* Find a waiting virtual channel for the next transfer. */ + list_for_each_entry(p, &s3cdma->memcpy.channels, vc.chan.device_node) + if (p->state == S3C24XX_DMA_CHAN_WAITING) { + next = p; + break; + } + + if (!next) { + list_for_each_entry(p, &s3cdma->slave.channels, + vc.chan.device_node) + if (p->state == S3C24XX_DMA_CHAN_WAITING && + s3c24xx_dma_phy_valid(p, s3cchan->phy)) { + next = p; + break; + } + } + + /* Ensure that the physical channel is stopped */ + s3c24xx_dma_terminate_phy(s3cchan->phy); + + if (next) { + bool success; + + /* + * Eww. We know this isn't going to deadlock + * but lockdep probably doesn't. + */ + spin_lock(&next->vc.lock); + /* Re-check the state now that we have the lock */ + success = next->state == S3C24XX_DMA_CHAN_WAITING; + if (success) + s3c24xx_dma_phy_reassign_start(s3cchan->phy, next); + spin_unlock(&next->vc.lock); + + /* If the state changed, try to find another channel */ + if (!success) + goto retry; + } else { + /* No more jobs, so free up the physical channel */ + s3c24xx_dma_put_phy(s3cchan->phy); + } + + s3cchan->phy = NULL; + s3cchan->state = S3C24XX_DMA_CHAN_IDLE; +} + +static void s3c24xx_dma_desc_free(struct virt_dma_desc *vd) +{ + struct s3c24xx_txd *txd = to_s3c24xx_txd(&vd->tx); + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(vd->tx.chan); + + if (!s3cchan->slave) + dma_descriptor_unmap(&vd->tx); + + s3c24xx_dma_free_txd(txd); +} + +static irqreturn_t s3c24xx_dma_irq(int irq, void *data) +{ + struct s3c24xx_dma_phy *phy = data; + struct s3c24xx_dma_chan *s3cchan = phy->serving; + struct s3c24xx_txd *txd; + + dev_dbg(&phy->host->pdev->dev, "interrupt on channel %d\n", phy->id); + + /* + * Interrupts happen to notify the completion of a transfer and the + * channel should have moved into its stop state already on its own. + * Therefore interrupts on channels not bound to a virtual channel + * should never happen. Nevertheless send a terminate command to the + * channel if the unlikely case happens. + */ + if (unlikely(!s3cchan)) { + dev_err(&phy->host->pdev->dev, "interrupt on unused channel %d\n", + phy->id); + + s3c24xx_dma_terminate_phy(phy); + + return IRQ_HANDLED; + } + + spin_lock(&s3cchan->vc.lock); + txd = s3cchan->at; + if (txd) { + /* when more sg's are in this txd, start the next one */ + if (!list_is_last(txd->at, &txd->dsg_list)) { + txd->at = txd->at->next; + if (txd->cyclic) + vchan_cyclic_callback(&txd->vd); + s3c24xx_dma_start_next_sg(s3cchan, txd); + } else if (!txd->cyclic) { + s3cchan->at = NULL; + vchan_cookie_complete(&txd->vd); + + /* + * And start the next descriptor (if any), + * otherwise free this channel. + */ + if (vchan_next_desc(&s3cchan->vc)) + s3c24xx_dma_start_next_txd(s3cchan); + else + s3c24xx_dma_phy_free(s3cchan); + } else { + vchan_cyclic_callback(&txd->vd); + + /* Cyclic: reset at beginning */ + txd->at = txd->dsg_list.next; + s3c24xx_dma_start_next_sg(s3cchan, txd); + } + } + spin_unlock(&s3cchan->vc.lock); + + return IRQ_HANDLED; +} + +/* + * The DMA ENGINE API + */ + +static int s3c24xx_dma_terminate_all(struct dma_chan *chan) +{ + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + unsigned long flags; + int ret = 0; + + spin_lock_irqsave(&s3cchan->vc.lock, flags); + + if (!s3cchan->phy && !s3cchan->at) { + dev_err(&s3cdma->pdev->dev, "trying to terminate already stopped channel %d\n", + s3cchan->id); + ret = -EINVAL; + goto unlock; + } + + s3cchan->state = S3C24XX_DMA_CHAN_IDLE; + + /* Mark physical channel as free */ + if (s3cchan->phy) + s3c24xx_dma_phy_free(s3cchan); + + /* Dequeue current job */ + if (s3cchan->at) { + s3c24xx_dma_desc_free(&s3cchan->at->vd); + s3cchan->at = NULL; + } + + /* Dequeue jobs not yet fired as well */ + s3c24xx_dma_free_txd_list(s3cdma, s3cchan); +unlock: + spin_unlock_irqrestore(&s3cchan->vc.lock, flags); + + return ret; +} + +static void s3c24xx_dma_free_chan_resources(struct dma_chan *chan) +{ + /* Ensure all queued descriptors are freed */ + vchan_free_chan_resources(to_virt_chan(chan)); +} + +static enum dma_status s3c24xx_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); + struct s3c24xx_txd *txd; + struct s3c24xx_sg *dsg; + struct virt_dma_desc *vd; + unsigned long flags; + enum dma_status ret; + size_t bytes = 0; + + spin_lock_irqsave(&s3cchan->vc.lock, flags); + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) { + spin_unlock_irqrestore(&s3cchan->vc.lock, flags); + return ret; + } + + /* + * There's no point calculating the residue if there's + * no txstate to store the value. + */ + if (!txstate) { + spin_unlock_irqrestore(&s3cchan->vc.lock, flags); + return ret; + } + + vd = vchan_find_desc(&s3cchan->vc, cookie); + if (vd) { + /* On the issued list, so hasn't been processed yet */ + txd = to_s3c24xx_txd(&vd->tx); + + list_for_each_entry(dsg, &txd->dsg_list, node) + bytes += dsg->len; + } else { + /* + * Currently running, so sum over the pending sg's and + * the currently active one. + */ + txd = s3cchan->at; + + dsg = list_entry(txd->at, struct s3c24xx_sg, node); + list_for_each_entry_from(dsg, &txd->dsg_list, node) + bytes += dsg->len; + + bytes += s3c24xx_dma_getbytes_chan(s3cchan); + } + spin_unlock_irqrestore(&s3cchan->vc.lock, flags); + + /* + * This cookie not complete yet + * Get number of bytes left in the active transactions and queue + */ + dma_set_residue(txstate, bytes); + + /* Whether waiting or running, we're in progress */ + return ret; +} + +/* + * Initialize a descriptor to be used by memcpy submit + */ +static struct dma_async_tx_descriptor *s3c24xx_dma_prep_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + struct s3c24xx_txd *txd; + struct s3c24xx_sg *dsg; + int src_mod, dest_mod; + + dev_dbg(&s3cdma->pdev->dev, "prepare memcpy of %d bytes from %s\n", + len, s3cchan->name); + + if ((len & S3C24XX_DCON_TC_MASK) != len) { + dev_err(&s3cdma->pdev->dev, "memcpy size %d to large\n", len); + return NULL; + } + + txd = s3c24xx_dma_get_txd(); + if (!txd) + return NULL; + + dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT); + if (!dsg) { + s3c24xx_dma_free_txd(txd); + return NULL; + } + list_add_tail(&dsg->node, &txd->dsg_list); + + dsg->src_addr = src; + dsg->dst_addr = dest; + dsg->len = len; + + /* + * Determine a suitable transfer width. + * The DMA controller cannot fetch/store information which is not + * naturally aligned on the bus, i.e., a 4 byte fetch must start at + * an address divisible by 4 - more generally addr % width must be 0. + */ + src_mod = src % 4; + dest_mod = dest % 4; + switch (len % 4) { + case 0: + txd->width = (src_mod == 0 && dest_mod == 0) ? 4 : 1; + break; + case 2: + txd->width = ((src_mod == 2 || src_mod == 0) && + (dest_mod == 2 || dest_mod == 0)) ? 2 : 1; + break; + default: + txd->width = 1; + break; + } + + txd->disrcc = S3C24XX_DISRCC_LOC_AHB | S3C24XX_DISRCC_INC_INCREMENT; + txd->didstc = S3C24XX_DIDSTC_LOC_AHB | S3C24XX_DIDSTC_INC_INCREMENT; + txd->dcon |= S3C24XX_DCON_DEMAND | S3C24XX_DCON_SYNC_HCLK | + S3C24XX_DCON_SERV_WHOLE; + + return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags); +} + +static struct dma_async_tx_descriptor *s3c24xx_dma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t addr, size_t size, size_t period, + enum dma_transfer_direction direction, unsigned long flags) +{ + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; + struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id]; + struct s3c24xx_txd *txd; + struct s3c24xx_sg *dsg; + unsigned sg_len; + dma_addr_t slave_addr; + u32 hwcfg = 0; + int i; + + dev_dbg(&s3cdma->pdev->dev, + "prepare cyclic transaction of %zu bytes with period %zu from %s\n", + size, period, s3cchan->name); + + if (!is_slave_direction(direction)) { + dev_err(&s3cdma->pdev->dev, + "direction %d unsupported\n", direction); + return NULL; + } + + txd = s3c24xx_dma_get_txd(); + if (!txd) + return NULL; + + txd->cyclic = 1; + + if (cdata->handshake) + txd->dcon |= S3C24XX_DCON_HANDSHAKE; + + switch (cdata->bus) { + case S3C24XX_DMA_APB: + txd->dcon |= S3C24XX_DCON_SYNC_PCLK; + hwcfg |= S3C24XX_DISRCC_LOC_APB; + break; + case S3C24XX_DMA_AHB: + txd->dcon |= S3C24XX_DCON_SYNC_HCLK; + hwcfg |= S3C24XX_DISRCC_LOC_AHB; + break; + } + + /* + * Always assume our peripheral desintation is a fixed + * address in memory. + */ + hwcfg |= S3C24XX_DISRCC_INC_FIXED; + + /* + * Individual dma operations are requested by the slave, + * so serve only single atomic operations (S3C24XX_DCON_SERV_SINGLE). + */ + txd->dcon |= S3C24XX_DCON_SERV_SINGLE; + + if (direction == DMA_MEM_TO_DEV) { + txd->disrcc = S3C24XX_DISRCC_LOC_AHB | + S3C24XX_DISRCC_INC_INCREMENT; + txd->didstc = hwcfg; + slave_addr = s3cchan->cfg.dst_addr; + txd->width = s3cchan->cfg.dst_addr_width; + } else { + txd->disrcc = hwcfg; + txd->didstc = S3C24XX_DIDSTC_LOC_AHB | + S3C24XX_DIDSTC_INC_INCREMENT; + slave_addr = s3cchan->cfg.src_addr; + txd->width = s3cchan->cfg.src_addr_width; + } + + sg_len = size / period; + + for (i = 0; i < sg_len; i++) { + dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT); + if (!dsg) { + s3c24xx_dma_free_txd(txd); + return NULL; + } + list_add_tail(&dsg->node, &txd->dsg_list); + + dsg->len = period; + /* Check last period length */ + if (i == sg_len - 1) + dsg->len = size - period * i; + if (direction == DMA_MEM_TO_DEV) { + dsg->src_addr = addr + period * i; + dsg->dst_addr = slave_addr; + } else { /* DMA_DEV_TO_MEM */ + dsg->src_addr = slave_addr; + dsg->dst_addr = addr + period * i; + } + } + + return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags); +} + +static struct dma_async_tx_descriptor *s3c24xx_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); + struct s3c24xx_dma_engine *s3cdma = s3cchan->host; + const struct s3c24xx_dma_platdata *pdata = s3cdma->pdata; + struct s3c24xx_dma_channel *cdata = &pdata->channels[s3cchan->id]; + struct s3c24xx_txd *txd; + struct s3c24xx_sg *dsg; + struct scatterlist *sg; + dma_addr_t slave_addr; + u32 hwcfg = 0; + int tmp; + + dev_dbg(&s3cdma->pdev->dev, "prepare transaction of %d bytes from %s\n", + sg_dma_len(sgl), s3cchan->name); + + txd = s3c24xx_dma_get_txd(); + if (!txd) + return NULL; + + if (cdata->handshake) + txd->dcon |= S3C24XX_DCON_HANDSHAKE; + + switch (cdata->bus) { + case S3C24XX_DMA_APB: + txd->dcon |= S3C24XX_DCON_SYNC_PCLK; + hwcfg |= S3C24XX_DISRCC_LOC_APB; + break; + case S3C24XX_DMA_AHB: + txd->dcon |= S3C24XX_DCON_SYNC_HCLK; + hwcfg |= S3C24XX_DISRCC_LOC_AHB; + break; + } + + /* + * Always assume our peripheral desintation is a fixed + * address in memory. + */ + hwcfg |= S3C24XX_DISRCC_INC_FIXED; + + /* + * Individual dma operations are requested by the slave, + * so serve only single atomic operations (S3C24XX_DCON_SERV_SINGLE). + */ + txd->dcon |= S3C24XX_DCON_SERV_SINGLE; + + if (direction == DMA_MEM_TO_DEV) { + txd->disrcc = S3C24XX_DISRCC_LOC_AHB | + S3C24XX_DISRCC_INC_INCREMENT; + txd->didstc = hwcfg; + slave_addr = s3cchan->cfg.dst_addr; + txd->width = s3cchan->cfg.dst_addr_width; + } else if (direction == DMA_DEV_TO_MEM) { + txd->disrcc = hwcfg; + txd->didstc = S3C24XX_DIDSTC_LOC_AHB | + S3C24XX_DIDSTC_INC_INCREMENT; + slave_addr = s3cchan->cfg.src_addr; + txd->width = s3cchan->cfg.src_addr_width; + } else { + s3c24xx_dma_free_txd(txd); + dev_err(&s3cdma->pdev->dev, + "direction %d unsupported\n", direction); + return NULL; + } + + for_each_sg(sgl, sg, sg_len, tmp) { + dsg = kzalloc(sizeof(*dsg), GFP_NOWAIT); + if (!dsg) { + s3c24xx_dma_free_txd(txd); + return NULL; + } + list_add_tail(&dsg->node, &txd->dsg_list); + + dsg->len = sg_dma_len(sg); + if (direction == DMA_MEM_TO_DEV) { + dsg->src_addr = sg_dma_address(sg); + dsg->dst_addr = slave_addr; + } else { /* DMA_DEV_TO_MEM */ + dsg->src_addr = slave_addr; + dsg->dst_addr = sg_dma_address(sg); + } + } + + return vchan_tx_prep(&s3cchan->vc, &txd->vd, flags); +} + +/* + * Slave transactions callback to the slave device to allow + * synchronization of slave DMA signals with the DMAC enable + */ +static void s3c24xx_dma_issue_pending(struct dma_chan *chan) +{ + struct s3c24xx_dma_chan *s3cchan = to_s3c24xx_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&s3cchan->vc.lock, flags); + if (vchan_issue_pending(&s3cchan->vc)) { + if (!s3cchan->phy && s3cchan->state != S3C24XX_DMA_CHAN_WAITING) + s3c24xx_dma_phy_alloc_and_start(s3cchan); + } + spin_unlock_irqrestore(&s3cchan->vc.lock, flags); +} + +/* + * Bringup and teardown + */ + +/* + * Initialise the DMAC memcpy/slave channels. + * Make a local wrapper to hold required data + */ +static int s3c24xx_dma_init_virtual_channels(struct s3c24xx_dma_engine *s3cdma, + struct dma_device *dmadev, unsigned int channels, bool slave) +{ + struct s3c24xx_dma_chan *chan; + int i; + + INIT_LIST_HEAD(&dmadev->channels); + + /* + * Register as many many memcpy as we have physical channels, + * we won't always be able to use all but the code will have + * to cope with that situation. + */ + for (i = 0; i < channels; i++) { + chan = devm_kzalloc(dmadev->dev, sizeof(*chan), GFP_KERNEL); + if (!chan) { + dev_err(dmadev->dev, + "%s no memory for channel\n", __func__); + return -ENOMEM; + } + + chan->id = i; + chan->host = s3cdma; + chan->state = S3C24XX_DMA_CHAN_IDLE; + + if (slave) { + chan->slave = true; + chan->name = kasprintf(GFP_KERNEL, "slave%d", i); + if (!chan->name) + return -ENOMEM; + } else { + chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); + if (!chan->name) + return -ENOMEM; + } + dev_dbg(dmadev->dev, + "initialize virtual channel \"%s\"\n", + chan->name); + + chan->vc.desc_free = s3c24xx_dma_desc_free; + vchan_init(&chan->vc, dmadev); + } + dev_info(dmadev->dev, "initialized %d virtual %s channels\n", + i, slave ? "slave" : "memcpy"); + return i; +} + +static void s3c24xx_dma_free_virtual_channels(struct dma_device *dmadev) +{ + struct s3c24xx_dma_chan *chan = NULL; + struct s3c24xx_dma_chan *next; + + list_for_each_entry_safe(chan, + next, &dmadev->channels, vc.chan.device_node) + list_del(&chan->vc.chan.device_node); +} + +/* s3c2410, s3c2440 and s3c2442 have a 0x40 stride without separate clocks */ +static struct soc_data soc_s3c2410 = { + .stride = 0x40, + .has_reqsel = false, + .has_clocks = false, +}; + +/* s3c2412 and s3c2413 have a 0x40 stride and dmareqsel mechanism */ +static struct soc_data soc_s3c2412 = { + .stride = 0x40, + .has_reqsel = true, + .has_clocks = true, +}; + +/* s3c2443 and following have a 0x100 stride and dmareqsel mechanism */ +static struct soc_data soc_s3c2443 = { + .stride = 0x100, + .has_reqsel = true, + .has_clocks = true, +}; + +static struct platform_device_id s3c24xx_dma_driver_ids[] = { + { + .name = "s3c2410-dma", + .driver_data = (kernel_ulong_t)&soc_s3c2410, + }, { + .name = "s3c2412-dma", + .driver_data = (kernel_ulong_t)&soc_s3c2412, + }, { + .name = "s3c2443-dma", + .driver_data = (kernel_ulong_t)&soc_s3c2443, + }, + { }, +}; + +static struct soc_data *s3c24xx_dma_get_soc_data(struct platform_device *pdev) +{ + return (struct soc_data *) + platform_get_device_id(pdev)->driver_data; +} + +static int s3c24xx_dma_probe(struct platform_device *pdev) +{ + const struct s3c24xx_dma_platdata *pdata = dev_get_platdata(&pdev->dev); + struct s3c24xx_dma_engine *s3cdma; + struct soc_data *sdata; + struct resource *res; + int ret; + int i; + + if (!pdata) { + dev_err(&pdev->dev, "platform data missing\n"); + return -ENODEV; + } + + /* Basic sanity check */ + if (pdata->num_phy_channels > MAX_DMA_CHANNELS) { + dev_err(&pdev->dev, "to many dma channels %d, max %d\n", + pdata->num_phy_channels, MAX_DMA_CHANNELS); + return -EINVAL; + } + + sdata = s3c24xx_dma_get_soc_data(pdev); + if (!sdata) + return -EINVAL; + + s3cdma = devm_kzalloc(&pdev->dev, sizeof(*s3cdma), GFP_KERNEL); + if (!s3cdma) + return -ENOMEM; + + s3cdma->pdev = pdev; + s3cdma->pdata = pdata; + s3cdma->sdata = sdata; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + s3cdma->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(s3cdma->base)) + return PTR_ERR(s3cdma->base); + + s3cdma->phy_chans = devm_kzalloc(&pdev->dev, + sizeof(struct s3c24xx_dma_phy) * + pdata->num_phy_channels, + GFP_KERNEL); + if (!s3cdma->phy_chans) + return -ENOMEM; + + /* acquire irqs and clocks for all physical channels */ + for (i = 0; i < pdata->num_phy_channels; i++) { + struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i]; + char clk_name[6]; + + phy->id = i; + phy->base = s3cdma->base + (i * sdata->stride); + phy->host = s3cdma; + + phy->irq = platform_get_irq(pdev, i); + if (phy->irq < 0) { + dev_err(&pdev->dev, "failed to get irq %d, err %d\n", + i, phy->irq); + continue; + } + + ret = devm_request_irq(&pdev->dev, phy->irq, s3c24xx_dma_irq, + 0, pdev->name, phy); + if (ret) { + dev_err(&pdev->dev, "Unable to request irq for channel %d, error %d\n", + i, ret); + continue; + } + + if (sdata->has_clocks) { + sprintf(clk_name, "dma.%d", i); + phy->clk = devm_clk_get(&pdev->dev, clk_name); + if (IS_ERR(phy->clk) && sdata->has_clocks) { + dev_err(&pdev->dev, "unable to acquire clock for channel %d, error %lu\n", + i, PTR_ERR(phy->clk)); + continue; + } + + ret = clk_prepare(phy->clk); + if (ret) { + dev_err(&pdev->dev, "clock for phy %d failed, error %d\n", + i, ret); + continue; + } + } + + spin_lock_init(&phy->lock); + phy->valid = true; + + dev_dbg(&pdev->dev, "physical channel %d is %s\n", + i, s3c24xx_dma_phy_busy(phy) ? "BUSY" : "FREE"); + } + + /* Initialize memcpy engine */ + dma_cap_set(DMA_MEMCPY, s3cdma->memcpy.cap_mask); + dma_cap_set(DMA_PRIVATE, s3cdma->memcpy.cap_mask); + s3cdma->memcpy.dev = &pdev->dev; + s3cdma->memcpy.device_free_chan_resources = + s3c24xx_dma_free_chan_resources; + s3cdma->memcpy.device_prep_dma_memcpy = s3c24xx_dma_prep_memcpy; + s3cdma->memcpy.device_tx_status = s3c24xx_dma_tx_status; + s3cdma->memcpy.device_issue_pending = s3c24xx_dma_issue_pending; + s3cdma->memcpy.device_config = s3c24xx_dma_set_runtime_config; + s3cdma->memcpy.device_terminate_all = s3c24xx_dma_terminate_all; + + /* Initialize slave engine for SoC internal dedicated peripherals */ + dma_cap_set(DMA_SLAVE, s3cdma->slave.cap_mask); + dma_cap_set(DMA_CYCLIC, s3cdma->slave.cap_mask); + dma_cap_set(DMA_PRIVATE, s3cdma->slave.cap_mask); + s3cdma->slave.dev = &pdev->dev; + s3cdma->slave.device_free_chan_resources = + s3c24xx_dma_free_chan_resources; + s3cdma->slave.device_tx_status = s3c24xx_dma_tx_status; + s3cdma->slave.device_issue_pending = s3c24xx_dma_issue_pending; + s3cdma->slave.device_prep_slave_sg = s3c24xx_dma_prep_slave_sg; + s3cdma->slave.device_prep_dma_cyclic = s3c24xx_dma_prep_dma_cyclic; + s3cdma->slave.device_config = s3c24xx_dma_set_runtime_config; + s3cdma->slave.device_terminate_all = s3c24xx_dma_terminate_all; + + /* Register as many memcpy channels as there are physical channels */ + ret = s3c24xx_dma_init_virtual_channels(s3cdma, &s3cdma->memcpy, + pdata->num_phy_channels, false); + if (ret <= 0) { + dev_warn(&pdev->dev, + "%s failed to enumerate memcpy channels - %d\n", + __func__, ret); + goto err_memcpy; + } + + /* Register slave channels */ + ret = s3c24xx_dma_init_virtual_channels(s3cdma, &s3cdma->slave, + pdata->num_channels, true); + if (ret <= 0) { + dev_warn(&pdev->dev, + "%s failed to enumerate slave channels - %d\n", + __func__, ret); + goto err_slave; + } + + ret = dma_async_device_register(&s3cdma->memcpy); + if (ret) { + dev_warn(&pdev->dev, + "%s failed to register memcpy as an async device - %d\n", + __func__, ret); + goto err_memcpy_reg; + } + + ret = dma_async_device_register(&s3cdma->slave); + if (ret) { + dev_warn(&pdev->dev, + "%s failed to register slave as an async device - %d\n", + __func__, ret); + goto err_slave_reg; + } + + platform_set_drvdata(pdev, s3cdma); + dev_info(&pdev->dev, "Loaded dma driver with %d physical channels\n", + pdata->num_phy_channels); + + return 0; + +err_slave_reg: + dma_async_device_unregister(&s3cdma->memcpy); +err_memcpy_reg: + s3c24xx_dma_free_virtual_channels(&s3cdma->slave); +err_slave: + s3c24xx_dma_free_virtual_channels(&s3cdma->memcpy); +err_memcpy: + if (sdata->has_clocks) + for (i = 0; i < pdata->num_phy_channels; i++) { + struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i]; + if (phy->valid) + clk_unprepare(phy->clk); + } + + return ret; +} + +static int s3c24xx_dma_remove(struct platform_device *pdev) +{ + const struct s3c24xx_dma_platdata *pdata = dev_get_platdata(&pdev->dev); + struct s3c24xx_dma_engine *s3cdma = platform_get_drvdata(pdev); + struct soc_data *sdata = s3c24xx_dma_get_soc_data(pdev); + int i; + + dma_async_device_unregister(&s3cdma->slave); + dma_async_device_unregister(&s3cdma->memcpy); + + s3c24xx_dma_free_virtual_channels(&s3cdma->slave); + s3c24xx_dma_free_virtual_channels(&s3cdma->memcpy); + + if (sdata->has_clocks) + for (i = 0; i < pdata->num_phy_channels; i++) { + struct s3c24xx_dma_phy *phy = &s3cdma->phy_chans[i]; + if (phy->valid) + clk_unprepare(phy->clk); + } + + return 0; +} + +static struct platform_driver s3c24xx_dma_driver = { + .driver = { + .name = "s3c24xx-dma", + }, + .id_table = s3c24xx_dma_driver_ids, + .probe = s3c24xx_dma_probe, + .remove = s3c24xx_dma_remove, +}; + +module_platform_driver(s3c24xx_dma_driver); + +bool s3c24xx_dma_filter(struct dma_chan *chan, void *param) +{ + struct s3c24xx_dma_chan *s3cchan; + + if (chan->device->dev->driver != &s3c24xx_dma_driver.driver) + return false; + + s3cchan = to_s3c24xx_dma_chan(chan); + + return s3cchan->id == (int)param; +} +EXPORT_SYMBOL(s3c24xx_dma_filter); + +MODULE_DESCRIPTION("S3C24XX DMA Driver"); +MODULE_AUTHOR("Heiko Stuebner"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/sa11x0-dma.c b/drivers/dma/sa11x0-dma.c new file mode 100644 index 000000000..43db25505 --- /dev/null +++ b/drivers/dma/sa11x0-dma.c @@ -0,0 +1,1106 @@ +/* + * SA11x0 DMAengine support + * + * Copyright (C) 2012 Russell King + * Derived in part from arch/arm/mach-sa1100/dma.c, + * Copyright (C) 2000, 2001 by Nicolas Pitre + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/sched.h> +#include <linux/device.h> +#include <linux/dmaengine.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/sa11x0-dma.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "virt-dma.h" + +#define NR_PHY_CHAN 6 +#define DMA_ALIGN 3 +#define DMA_MAX_SIZE 0x1fff +#define DMA_CHUNK_SIZE 0x1000 + +#define DMA_DDAR 0x00 +#define DMA_DCSR_S 0x04 +#define DMA_DCSR_C 0x08 +#define DMA_DCSR_R 0x0c +#define DMA_DBSA 0x10 +#define DMA_DBTA 0x14 +#define DMA_DBSB 0x18 +#define DMA_DBTB 0x1c +#define DMA_SIZE 0x20 + +#define DCSR_RUN (1 << 0) +#define DCSR_IE (1 << 1) +#define DCSR_ERROR (1 << 2) +#define DCSR_DONEA (1 << 3) +#define DCSR_STRTA (1 << 4) +#define DCSR_DONEB (1 << 5) +#define DCSR_STRTB (1 << 6) +#define DCSR_BIU (1 << 7) + +#define DDAR_RW (1 << 0) /* 0 = W, 1 = R */ +#define DDAR_E (1 << 1) /* 0 = LE, 1 = BE */ +#define DDAR_BS (1 << 2) /* 0 = BS4, 1 = BS8 */ +#define DDAR_DW (1 << 3) /* 0 = 8b, 1 = 16b */ +#define DDAR_Ser0UDCTr (0x0 << 4) +#define DDAR_Ser0UDCRc (0x1 << 4) +#define DDAR_Ser1SDLCTr (0x2 << 4) +#define DDAR_Ser1SDLCRc (0x3 << 4) +#define DDAR_Ser1UARTTr (0x4 << 4) +#define DDAR_Ser1UARTRc (0x5 << 4) +#define DDAR_Ser2ICPTr (0x6 << 4) +#define DDAR_Ser2ICPRc (0x7 << 4) +#define DDAR_Ser3UARTTr (0x8 << 4) +#define DDAR_Ser3UARTRc (0x9 << 4) +#define DDAR_Ser4MCP0Tr (0xa << 4) +#define DDAR_Ser4MCP0Rc (0xb << 4) +#define DDAR_Ser4MCP1Tr (0xc << 4) +#define DDAR_Ser4MCP1Rc (0xd << 4) +#define DDAR_Ser4SSPTr (0xe << 4) +#define DDAR_Ser4SSPRc (0xf << 4) + +struct sa11x0_dma_sg { + u32 addr; + u32 len; +}; + +struct sa11x0_dma_desc { + struct virt_dma_desc vd; + + u32 ddar; + size_t size; + unsigned period; + bool cyclic; + + unsigned sglen; + struct sa11x0_dma_sg sg[0]; +}; + +struct sa11x0_dma_phy; + +struct sa11x0_dma_chan { + struct virt_dma_chan vc; + + /* protected by c->vc.lock */ + struct sa11x0_dma_phy *phy; + enum dma_status status; + + /* protected by d->lock */ + struct list_head node; + + u32 ddar; + const char *name; +}; + +struct sa11x0_dma_phy { + void __iomem *base; + struct sa11x0_dma_dev *dev; + unsigned num; + + struct sa11x0_dma_chan *vchan; + + /* Protected by c->vc.lock */ + unsigned sg_load; + struct sa11x0_dma_desc *txd_load; + unsigned sg_done; + struct sa11x0_dma_desc *txd_done; + u32 dbs[2]; + u32 dbt[2]; + u32 dcsr; +}; + +struct sa11x0_dma_dev { + struct dma_device slave; + void __iomem *base; + spinlock_t lock; + struct tasklet_struct task; + struct list_head chan_pending; + struct sa11x0_dma_phy phy[NR_PHY_CHAN]; +}; + +static struct sa11x0_dma_chan *to_sa11x0_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct sa11x0_dma_chan, vc.chan); +} + +static struct sa11x0_dma_dev *to_sa11x0_dma(struct dma_device *dmadev) +{ + return container_of(dmadev, struct sa11x0_dma_dev, slave); +} + +static struct sa11x0_dma_desc *sa11x0_dma_next_desc(struct sa11x0_dma_chan *c) +{ + struct virt_dma_desc *vd = vchan_next_desc(&c->vc); + + return vd ? container_of(vd, struct sa11x0_dma_desc, vd) : NULL; +} + +static void sa11x0_dma_free_desc(struct virt_dma_desc *vd) +{ + kfree(container_of(vd, struct sa11x0_dma_desc, vd)); +} + +static void sa11x0_dma_start_desc(struct sa11x0_dma_phy *p, struct sa11x0_dma_desc *txd) +{ + list_del(&txd->vd.node); + p->txd_load = txd; + p->sg_load = 0; + + dev_vdbg(p->dev->slave.dev, "pchan %u: txd %p[%x]: starting: DDAR:%x\n", + p->num, &txd->vd, txd->vd.tx.cookie, txd->ddar); +} + +static void noinline sa11x0_dma_start_sg(struct sa11x0_dma_phy *p, + struct sa11x0_dma_chan *c) +{ + struct sa11x0_dma_desc *txd = p->txd_load; + struct sa11x0_dma_sg *sg; + void __iomem *base = p->base; + unsigned dbsx, dbtx; + u32 dcsr; + + if (!txd) + return; + + dcsr = readl_relaxed(base + DMA_DCSR_R); + + /* Don't try to load the next transfer if both buffers are started */ + if ((dcsr & (DCSR_STRTA | DCSR_STRTB)) == (DCSR_STRTA | DCSR_STRTB)) + return; + + if (p->sg_load == txd->sglen) { + if (!txd->cyclic) { + struct sa11x0_dma_desc *txn = sa11x0_dma_next_desc(c); + + /* + * We have reached the end of the current descriptor. + * Peek at the next descriptor, and if compatible with + * the current, start processing it. + */ + if (txn && txn->ddar == txd->ddar) { + txd = txn; + sa11x0_dma_start_desc(p, txn); + } else { + p->txd_load = NULL; + return; + } + } else { + /* Cyclic: reset back to beginning */ + p->sg_load = 0; + } + } + + sg = &txd->sg[p->sg_load++]; + + /* Select buffer to load according to channel status */ + if (((dcsr & (DCSR_BIU | DCSR_STRTB)) == (DCSR_BIU | DCSR_STRTB)) || + ((dcsr & (DCSR_BIU | DCSR_STRTA)) == 0)) { + dbsx = DMA_DBSA; + dbtx = DMA_DBTA; + dcsr = DCSR_STRTA | DCSR_IE | DCSR_RUN; + } else { + dbsx = DMA_DBSB; + dbtx = DMA_DBTB; + dcsr = DCSR_STRTB | DCSR_IE | DCSR_RUN; + } + + writel_relaxed(sg->addr, base + dbsx); + writel_relaxed(sg->len, base + dbtx); + writel(dcsr, base + DMA_DCSR_S); + + dev_dbg(p->dev->slave.dev, "pchan %u: load: DCSR:%02x DBS%c:%08x DBT%c:%08x\n", + p->num, dcsr, + 'A' + (dbsx == DMA_DBSB), sg->addr, + 'A' + (dbtx == DMA_DBTB), sg->len); +} + +static void noinline sa11x0_dma_complete(struct sa11x0_dma_phy *p, + struct sa11x0_dma_chan *c) +{ + struct sa11x0_dma_desc *txd = p->txd_done; + + if (++p->sg_done == txd->sglen) { + if (!txd->cyclic) { + vchan_cookie_complete(&txd->vd); + + p->sg_done = 0; + p->txd_done = p->txd_load; + + if (!p->txd_done) + tasklet_schedule(&p->dev->task); + } else { + if ((p->sg_done % txd->period) == 0) + vchan_cyclic_callback(&txd->vd); + + /* Cyclic: reset back to beginning */ + p->sg_done = 0; + } + } + + sa11x0_dma_start_sg(p, c); +} + +static irqreturn_t sa11x0_dma_irq(int irq, void *dev_id) +{ + struct sa11x0_dma_phy *p = dev_id; + struct sa11x0_dma_dev *d = p->dev; + struct sa11x0_dma_chan *c; + u32 dcsr; + + dcsr = readl_relaxed(p->base + DMA_DCSR_R); + if (!(dcsr & (DCSR_ERROR | DCSR_DONEA | DCSR_DONEB))) + return IRQ_NONE; + + /* Clear reported status bits */ + writel_relaxed(dcsr & (DCSR_ERROR | DCSR_DONEA | DCSR_DONEB), + p->base + DMA_DCSR_C); + + dev_dbg(d->slave.dev, "pchan %u: irq: DCSR:%02x\n", p->num, dcsr); + + if (dcsr & DCSR_ERROR) { + dev_err(d->slave.dev, "pchan %u: error. DCSR:%02x DDAR:%08x DBSA:%08x DBTA:%08x DBSB:%08x DBTB:%08x\n", + p->num, dcsr, + readl_relaxed(p->base + DMA_DDAR), + readl_relaxed(p->base + DMA_DBSA), + readl_relaxed(p->base + DMA_DBTA), + readl_relaxed(p->base + DMA_DBSB), + readl_relaxed(p->base + DMA_DBTB)); + } + + c = p->vchan; + if (c) { + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + /* + * Now that we're holding the lock, check that the vchan + * really is associated with this pchan before touching the + * hardware. This should always succeed, because we won't + * change p->vchan or c->phy while the channel is actively + * transferring. + */ + if (c->phy == p) { + if (dcsr & DCSR_DONEA) + sa11x0_dma_complete(p, c); + if (dcsr & DCSR_DONEB) + sa11x0_dma_complete(p, c); + } + spin_unlock_irqrestore(&c->vc.lock, flags); + } + + return IRQ_HANDLED; +} + +static void sa11x0_dma_start_txd(struct sa11x0_dma_chan *c) +{ + struct sa11x0_dma_desc *txd = sa11x0_dma_next_desc(c); + + /* If the issued list is empty, we have no further txds to process */ + if (txd) { + struct sa11x0_dma_phy *p = c->phy; + + sa11x0_dma_start_desc(p, txd); + p->txd_done = txd; + p->sg_done = 0; + + /* The channel should not have any transfers started */ + WARN_ON(readl_relaxed(p->base + DMA_DCSR_R) & + (DCSR_STRTA | DCSR_STRTB)); + + /* Clear the run and start bits before changing DDAR */ + writel_relaxed(DCSR_RUN | DCSR_STRTA | DCSR_STRTB, + p->base + DMA_DCSR_C); + writel_relaxed(txd->ddar, p->base + DMA_DDAR); + + /* Try to start both buffers */ + sa11x0_dma_start_sg(p, c); + sa11x0_dma_start_sg(p, c); + } +} + +static void sa11x0_dma_tasklet(unsigned long arg) +{ + struct sa11x0_dma_dev *d = (struct sa11x0_dma_dev *)arg; + struct sa11x0_dma_phy *p; + struct sa11x0_dma_chan *c; + unsigned pch, pch_alloc = 0; + + dev_dbg(d->slave.dev, "tasklet enter\n"); + + list_for_each_entry(c, &d->slave.channels, vc.chan.device_node) { + spin_lock_irq(&c->vc.lock); + p = c->phy; + if (p && !p->txd_done) { + sa11x0_dma_start_txd(c); + if (!p->txd_done) { + /* No current txd associated with this channel */ + dev_dbg(d->slave.dev, "pchan %u: free\n", p->num); + + /* Mark this channel free */ + c->phy = NULL; + p->vchan = NULL; + } + } + spin_unlock_irq(&c->vc.lock); + } + + spin_lock_irq(&d->lock); + for (pch = 0; pch < NR_PHY_CHAN; pch++) { + p = &d->phy[pch]; + + if (p->vchan == NULL && !list_empty(&d->chan_pending)) { + c = list_first_entry(&d->chan_pending, + struct sa11x0_dma_chan, node); + list_del_init(&c->node); + + pch_alloc |= 1 << pch; + + /* Mark this channel allocated */ + p->vchan = c; + + dev_dbg(d->slave.dev, "pchan %u: alloc vchan %p\n", pch, &c->vc); + } + } + spin_unlock_irq(&d->lock); + + for (pch = 0; pch < NR_PHY_CHAN; pch++) { + if (pch_alloc & (1 << pch)) { + p = &d->phy[pch]; + c = p->vchan; + + spin_lock_irq(&c->vc.lock); + c->phy = p; + + sa11x0_dma_start_txd(c); + spin_unlock_irq(&c->vc.lock); + } + } + + dev_dbg(d->slave.dev, "tasklet exit\n"); +} + + +static void sa11x0_dma_free_chan_resources(struct dma_chan *chan) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device); + unsigned long flags; + + spin_lock_irqsave(&d->lock, flags); + list_del_init(&c->node); + spin_unlock_irqrestore(&d->lock, flags); + + vchan_free_chan_resources(&c->vc); +} + +static dma_addr_t sa11x0_dma_pos(struct sa11x0_dma_phy *p) +{ + unsigned reg; + u32 dcsr; + + dcsr = readl_relaxed(p->base + DMA_DCSR_R); + + if ((dcsr & (DCSR_BIU | DCSR_STRTA)) == DCSR_STRTA || + (dcsr & (DCSR_BIU | DCSR_STRTB)) == DCSR_BIU) + reg = DMA_DBSA; + else + reg = DMA_DBSB; + + return readl_relaxed(p->base + reg); +} + +static enum dma_status sa11x0_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device); + struct sa11x0_dma_phy *p; + struct virt_dma_desc *vd; + unsigned long flags; + enum dma_status ret; + + ret = dma_cookie_status(&c->vc.chan, cookie, state); + if (ret == DMA_COMPLETE) + return ret; + + if (!state) + return c->status; + + spin_lock_irqsave(&c->vc.lock, flags); + p = c->phy; + + /* + * If the cookie is on our issue queue, then the residue is + * its total size. + */ + vd = vchan_find_desc(&c->vc, cookie); + if (vd) { + state->residue = container_of(vd, struct sa11x0_dma_desc, vd)->size; + } else if (!p) { + state->residue = 0; + } else { + struct sa11x0_dma_desc *txd; + size_t bytes = 0; + + if (p->txd_done && p->txd_done->vd.tx.cookie == cookie) + txd = p->txd_done; + else if (p->txd_load && p->txd_load->vd.tx.cookie == cookie) + txd = p->txd_load; + else + txd = NULL; + + ret = c->status; + if (txd) { + dma_addr_t addr = sa11x0_dma_pos(p); + unsigned i; + + dev_vdbg(d->slave.dev, "tx_status: addr:%x\n", addr); + + for (i = 0; i < txd->sglen; i++) { + dev_vdbg(d->slave.dev, "tx_status: [%u] %x+%x\n", + i, txd->sg[i].addr, txd->sg[i].len); + if (addr >= txd->sg[i].addr && + addr < txd->sg[i].addr + txd->sg[i].len) { + unsigned len; + + len = txd->sg[i].len - + (addr - txd->sg[i].addr); + dev_vdbg(d->slave.dev, "tx_status: [%u] +%x\n", + i, len); + bytes += len; + i++; + break; + } + } + for (; i < txd->sglen; i++) { + dev_vdbg(d->slave.dev, "tx_status: [%u] %x+%x ++\n", + i, txd->sg[i].addr, txd->sg[i].len); + bytes += txd->sg[i].len; + } + } + state->residue = bytes; + } + spin_unlock_irqrestore(&c->vc.lock, flags); + + dev_vdbg(d->slave.dev, "tx_status: bytes 0x%zx\n", state->residue); + + return ret; +} + +/* + * Move pending txds to the issued list, and re-init pending list. + * If not already pending, add this channel to the list of pending + * channels and trigger the tasklet to run. + */ +static void sa11x0_dma_issue_pending(struct dma_chan *chan) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device); + unsigned long flags; + + spin_lock_irqsave(&c->vc.lock, flags); + if (vchan_issue_pending(&c->vc)) { + if (!c->phy) { + spin_lock(&d->lock); + if (list_empty(&c->node)) { + list_add_tail(&c->node, &d->chan_pending); + tasklet_schedule(&d->task); + dev_dbg(d->slave.dev, "vchan %p: issued\n", &c->vc); + } + spin_unlock(&d->lock); + } + } else + dev_dbg(d->slave.dev, "vchan %p: nothing to issue\n", &c->vc); + spin_unlock_irqrestore(&c->vc.lock, flags); +} + +static struct dma_async_tx_descriptor *sa11x0_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sg, unsigned int sglen, + enum dma_transfer_direction dir, unsigned long flags, void *context) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_desc *txd; + struct scatterlist *sgent; + unsigned i, j = sglen; + size_t size = 0; + + /* SA11x0 channels can only operate in their native direction */ + if (dir != (c->ddar & DDAR_RW ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV)) { + dev_err(chan->device->dev, "vchan %p: bad DMA direction: DDAR:%08x dir:%u\n", + &c->vc, c->ddar, dir); + return NULL; + } + + /* Do not allow zero-sized txds */ + if (sglen == 0) + return NULL; + + for_each_sg(sg, sgent, sglen, i) { + dma_addr_t addr = sg_dma_address(sgent); + unsigned int len = sg_dma_len(sgent); + + if (len > DMA_MAX_SIZE) + j += DIV_ROUND_UP(len, DMA_MAX_SIZE & ~DMA_ALIGN) - 1; + if (addr & DMA_ALIGN) { + dev_dbg(chan->device->dev, "vchan %p: bad buffer alignment: %08x\n", + &c->vc, addr); + return NULL; + } + } + + txd = kzalloc(sizeof(*txd) + j * sizeof(txd->sg[0]), GFP_ATOMIC); + if (!txd) { + dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc); + return NULL; + } + + j = 0; + for_each_sg(sg, sgent, sglen, i) { + dma_addr_t addr = sg_dma_address(sgent); + unsigned len = sg_dma_len(sgent); + + size += len; + + do { + unsigned tlen = len; + + /* + * Check whether the transfer will fit. If not, try + * to split the transfer up such that we end up with + * equal chunks - but make sure that we preserve the + * alignment. This avoids small segments. + */ + if (tlen > DMA_MAX_SIZE) { + unsigned mult = DIV_ROUND_UP(tlen, + DMA_MAX_SIZE & ~DMA_ALIGN); + + tlen = (tlen / mult) & ~DMA_ALIGN; + } + + txd->sg[j].addr = addr; + txd->sg[j].len = tlen; + + addr += tlen; + len -= tlen; + j++; + } while (len); + } + + txd->ddar = c->ddar; + txd->size = size; + txd->sglen = j; + + dev_dbg(chan->device->dev, "vchan %p: txd %p: size %u nr %u\n", + &c->vc, &txd->vd, txd->size, txd->sglen); + + return vchan_tx_prep(&c->vc, &txd->vd, flags); +} + +static struct dma_async_tx_descriptor *sa11x0_dma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t addr, size_t size, size_t period, + enum dma_transfer_direction dir, unsigned long flags) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_desc *txd; + unsigned i, j, k, sglen, sgperiod; + + /* SA11x0 channels can only operate in their native direction */ + if (dir != (c->ddar & DDAR_RW ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV)) { + dev_err(chan->device->dev, "vchan %p: bad DMA direction: DDAR:%08x dir:%u\n", + &c->vc, c->ddar, dir); + return NULL; + } + + sgperiod = DIV_ROUND_UP(period, DMA_MAX_SIZE & ~DMA_ALIGN); + sglen = size * sgperiod / period; + + /* Do not allow zero-sized txds */ + if (sglen == 0) + return NULL; + + txd = kzalloc(sizeof(*txd) + sglen * sizeof(txd->sg[0]), GFP_ATOMIC); + if (!txd) { + dev_dbg(chan->device->dev, "vchan %p: kzalloc failed\n", &c->vc); + return NULL; + } + + for (i = k = 0; i < size / period; i++) { + size_t tlen, len = period; + + for (j = 0; j < sgperiod; j++, k++) { + tlen = len; + + if (tlen > DMA_MAX_SIZE) { + unsigned mult = DIV_ROUND_UP(tlen, DMA_MAX_SIZE & ~DMA_ALIGN); + tlen = (tlen / mult) & ~DMA_ALIGN; + } + + txd->sg[k].addr = addr; + txd->sg[k].len = tlen; + addr += tlen; + len -= tlen; + } + + WARN_ON(len != 0); + } + + WARN_ON(k != sglen); + + txd->ddar = c->ddar; + txd->size = size; + txd->sglen = sglen; + txd->cyclic = 1; + txd->period = sgperiod; + + return vchan_tx_prep(&c->vc, &txd->vd, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); +} + +static int sa11x0_dma_device_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + u32 ddar = c->ddar & ((0xf << 4) | DDAR_RW); + dma_addr_t addr; + enum dma_slave_buswidth width; + u32 maxburst; + + if (ddar & DDAR_RW) { + addr = cfg->src_addr; + width = cfg->src_addr_width; + maxburst = cfg->src_maxburst; + } else { + addr = cfg->dst_addr; + width = cfg->dst_addr_width; + maxburst = cfg->dst_maxburst; + } + + if ((width != DMA_SLAVE_BUSWIDTH_1_BYTE && + width != DMA_SLAVE_BUSWIDTH_2_BYTES) || + (maxburst != 4 && maxburst != 8)) + return -EINVAL; + + if (width == DMA_SLAVE_BUSWIDTH_2_BYTES) + ddar |= DDAR_DW; + if (maxburst == 8) + ddar |= DDAR_BS; + + dev_dbg(c->vc.chan.device->dev, "vchan %p: dma_slave_config addr %x width %u burst %u\n", + &c->vc, addr, width, maxburst); + + c->ddar = ddar | (addr & 0xf0000000) | (addr & 0x003ffffc) << 6; + + return 0; +} + +static int sa11x0_dma_device_pause(struct dma_chan *chan) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device); + struct sa11x0_dma_phy *p; + LIST_HEAD(head); + unsigned long flags; + + dev_dbg(d->slave.dev, "vchan %p: pause\n", &c->vc); + spin_lock_irqsave(&c->vc.lock, flags); + if (c->status == DMA_IN_PROGRESS) { + c->status = DMA_PAUSED; + + p = c->phy; + if (p) { + writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_C); + } else { + spin_lock(&d->lock); + list_del_init(&c->node); + spin_unlock(&d->lock); + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); + + return 0; +} + +static int sa11x0_dma_device_resume(struct dma_chan *chan) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device); + struct sa11x0_dma_phy *p; + LIST_HEAD(head); + unsigned long flags; + + dev_dbg(d->slave.dev, "vchan %p: resume\n", &c->vc); + spin_lock_irqsave(&c->vc.lock, flags); + if (c->status == DMA_PAUSED) { + c->status = DMA_IN_PROGRESS; + + p = c->phy; + if (p) { + writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_S); + } else if (!list_empty(&c->vc.desc_issued)) { + spin_lock(&d->lock); + list_add_tail(&c->node, &d->chan_pending); + spin_unlock(&d->lock); + } + } + spin_unlock_irqrestore(&c->vc.lock, flags); + + return 0; +} + +static int sa11x0_dma_device_terminate_all(struct dma_chan *chan) +{ + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + struct sa11x0_dma_dev *d = to_sa11x0_dma(chan->device); + struct sa11x0_dma_phy *p; + LIST_HEAD(head); + unsigned long flags; + + dev_dbg(d->slave.dev, "vchan %p: terminate all\n", &c->vc); + /* Clear the tx descriptor lists */ + spin_lock_irqsave(&c->vc.lock, flags); + vchan_get_all_descriptors(&c->vc, &head); + + p = c->phy; + if (p) { + dev_dbg(d->slave.dev, "pchan %u: terminating\n", p->num); + /* vchan is assigned to a pchan - stop the channel */ + writel(DCSR_RUN | DCSR_IE | + DCSR_STRTA | DCSR_DONEA | + DCSR_STRTB | DCSR_DONEB, + p->base + DMA_DCSR_C); + + if (p->txd_load) { + if (p->txd_load != p->txd_done) + list_add_tail(&p->txd_load->vd.node, &head); + p->txd_load = NULL; + } + if (p->txd_done) { + list_add_tail(&p->txd_done->vd.node, &head); + p->txd_done = NULL; + } + c->phy = NULL; + spin_lock(&d->lock); + p->vchan = NULL; + spin_unlock(&d->lock); + tasklet_schedule(&d->task); + } + spin_unlock_irqrestore(&c->vc.lock, flags); + vchan_dma_desc_free_list(&c->vc, &head); + + return 0; +} + +struct sa11x0_dma_channel_desc { + u32 ddar; + const char *name; +}; + +#define CD(d1, d2) { .ddar = DDAR_##d1 | d2, .name = #d1 } +static const struct sa11x0_dma_channel_desc chan_desc[] = { + CD(Ser0UDCTr, 0), + CD(Ser0UDCRc, DDAR_RW), + CD(Ser1SDLCTr, 0), + CD(Ser1SDLCRc, DDAR_RW), + CD(Ser1UARTTr, 0), + CD(Ser1UARTRc, DDAR_RW), + CD(Ser2ICPTr, 0), + CD(Ser2ICPRc, DDAR_RW), + CD(Ser3UARTTr, 0), + CD(Ser3UARTRc, DDAR_RW), + CD(Ser4MCP0Tr, 0), + CD(Ser4MCP0Rc, DDAR_RW), + CD(Ser4MCP1Tr, 0), + CD(Ser4MCP1Rc, DDAR_RW), + CD(Ser4SSPTr, 0), + CD(Ser4SSPRc, DDAR_RW), +}; + +static int sa11x0_dma_init_dmadev(struct dma_device *dmadev, + struct device *dev) +{ + unsigned i; + + INIT_LIST_HEAD(&dmadev->channels); + dmadev->dev = dev; + dmadev->device_free_chan_resources = sa11x0_dma_free_chan_resources; + dmadev->device_config = sa11x0_dma_device_config; + dmadev->device_pause = sa11x0_dma_device_pause; + dmadev->device_resume = sa11x0_dma_device_resume; + dmadev->device_terminate_all = sa11x0_dma_device_terminate_all; + dmadev->device_tx_status = sa11x0_dma_tx_status; + dmadev->device_issue_pending = sa11x0_dma_issue_pending; + + for (i = 0; i < ARRAY_SIZE(chan_desc); i++) { + struct sa11x0_dma_chan *c; + + c = kzalloc(sizeof(*c), GFP_KERNEL); + if (!c) { + dev_err(dev, "no memory for channel %u\n", i); + return -ENOMEM; + } + + c->status = DMA_IN_PROGRESS; + c->ddar = chan_desc[i].ddar; + c->name = chan_desc[i].name; + INIT_LIST_HEAD(&c->node); + + c->vc.desc_free = sa11x0_dma_free_desc; + vchan_init(&c->vc, dmadev); + } + + return dma_async_device_register(dmadev); +} + +static int sa11x0_dma_request_irq(struct platform_device *pdev, int nr, + void *data) +{ + int irq = platform_get_irq(pdev, nr); + + if (irq <= 0) + return -ENXIO; + + return request_irq(irq, sa11x0_dma_irq, 0, dev_name(&pdev->dev), data); +} + +static void sa11x0_dma_free_irq(struct platform_device *pdev, int nr, + void *data) +{ + int irq = platform_get_irq(pdev, nr); + if (irq > 0) + free_irq(irq, data); +} + +static void sa11x0_dma_free_channels(struct dma_device *dmadev) +{ + struct sa11x0_dma_chan *c, *cn; + + list_for_each_entry_safe(c, cn, &dmadev->channels, vc.chan.device_node) { + list_del(&c->vc.chan.device_node); + tasklet_kill(&c->vc.task); + kfree(c); + } +} + +static int sa11x0_dma_probe(struct platform_device *pdev) +{ + struct sa11x0_dma_dev *d; + struct resource *res; + unsigned i; + int ret; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -ENXIO; + + d = kzalloc(sizeof(*d), GFP_KERNEL); + if (!d) { + ret = -ENOMEM; + goto err_alloc; + } + + spin_lock_init(&d->lock); + INIT_LIST_HEAD(&d->chan_pending); + + d->base = ioremap(res->start, resource_size(res)); + if (!d->base) { + ret = -ENOMEM; + goto err_ioremap; + } + + tasklet_init(&d->task, sa11x0_dma_tasklet, (unsigned long)d); + + for (i = 0; i < NR_PHY_CHAN; i++) { + struct sa11x0_dma_phy *p = &d->phy[i]; + + p->dev = d; + p->num = i; + p->base = d->base + i * DMA_SIZE; + writel_relaxed(DCSR_RUN | DCSR_IE | DCSR_ERROR | + DCSR_DONEA | DCSR_STRTA | DCSR_DONEB | DCSR_STRTB, + p->base + DMA_DCSR_C); + writel_relaxed(0, p->base + DMA_DDAR); + + ret = sa11x0_dma_request_irq(pdev, i, p); + if (ret) { + while (i) { + i--; + sa11x0_dma_free_irq(pdev, i, &d->phy[i]); + } + goto err_irq; + } + } + + dma_cap_set(DMA_SLAVE, d->slave.cap_mask); + dma_cap_set(DMA_CYCLIC, d->slave.cap_mask); + d->slave.device_prep_slave_sg = sa11x0_dma_prep_slave_sg; + d->slave.device_prep_dma_cyclic = sa11x0_dma_prep_dma_cyclic; + d->slave.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + d->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + d->slave.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES); + d->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES); + ret = sa11x0_dma_init_dmadev(&d->slave, &pdev->dev); + if (ret) { + dev_warn(d->slave.dev, "failed to register slave async device: %d\n", + ret); + goto err_slave_reg; + } + + platform_set_drvdata(pdev, d); + return 0; + + err_slave_reg: + sa11x0_dma_free_channels(&d->slave); + for (i = 0; i < NR_PHY_CHAN; i++) + sa11x0_dma_free_irq(pdev, i, &d->phy[i]); + err_irq: + tasklet_kill(&d->task); + iounmap(d->base); + err_ioremap: + kfree(d); + err_alloc: + return ret; +} + +static int sa11x0_dma_remove(struct platform_device *pdev) +{ + struct sa11x0_dma_dev *d = platform_get_drvdata(pdev); + unsigned pch; + + dma_async_device_unregister(&d->slave); + + sa11x0_dma_free_channels(&d->slave); + for (pch = 0; pch < NR_PHY_CHAN; pch++) + sa11x0_dma_free_irq(pdev, pch, &d->phy[pch]); + tasklet_kill(&d->task); + iounmap(d->base); + kfree(d); + + return 0; +} + +static int sa11x0_dma_suspend(struct device *dev) +{ + struct sa11x0_dma_dev *d = dev_get_drvdata(dev); + unsigned pch; + + for (pch = 0; pch < NR_PHY_CHAN; pch++) { + struct sa11x0_dma_phy *p = &d->phy[pch]; + u32 dcsr, saved_dcsr; + + dcsr = saved_dcsr = readl_relaxed(p->base + DMA_DCSR_R); + if (dcsr & DCSR_RUN) { + writel(DCSR_RUN | DCSR_IE, p->base + DMA_DCSR_C); + dcsr = readl_relaxed(p->base + DMA_DCSR_R); + } + + saved_dcsr &= DCSR_RUN | DCSR_IE; + if (dcsr & DCSR_BIU) { + p->dbs[0] = readl_relaxed(p->base + DMA_DBSB); + p->dbt[0] = readl_relaxed(p->base + DMA_DBTB); + p->dbs[1] = readl_relaxed(p->base + DMA_DBSA); + p->dbt[1] = readl_relaxed(p->base + DMA_DBTA); + saved_dcsr |= (dcsr & DCSR_STRTA ? DCSR_STRTB : 0) | + (dcsr & DCSR_STRTB ? DCSR_STRTA : 0); + } else { + p->dbs[0] = readl_relaxed(p->base + DMA_DBSA); + p->dbt[0] = readl_relaxed(p->base + DMA_DBTA); + p->dbs[1] = readl_relaxed(p->base + DMA_DBSB); + p->dbt[1] = readl_relaxed(p->base + DMA_DBTB); + saved_dcsr |= dcsr & (DCSR_STRTA | DCSR_STRTB); + } + p->dcsr = saved_dcsr; + + writel(DCSR_STRTA | DCSR_STRTB, p->base + DMA_DCSR_C); + } + + return 0; +} + +static int sa11x0_dma_resume(struct device *dev) +{ + struct sa11x0_dma_dev *d = dev_get_drvdata(dev); + unsigned pch; + + for (pch = 0; pch < NR_PHY_CHAN; pch++) { + struct sa11x0_dma_phy *p = &d->phy[pch]; + struct sa11x0_dma_desc *txd = NULL; + u32 dcsr = readl_relaxed(p->base + DMA_DCSR_R); + + WARN_ON(dcsr & (DCSR_BIU | DCSR_STRTA | DCSR_STRTB | DCSR_RUN)); + + if (p->txd_done) + txd = p->txd_done; + else if (p->txd_load) + txd = p->txd_load; + + if (!txd) + continue; + + writel_relaxed(txd->ddar, p->base + DMA_DDAR); + + writel_relaxed(p->dbs[0], p->base + DMA_DBSA); + writel_relaxed(p->dbt[0], p->base + DMA_DBTA); + writel_relaxed(p->dbs[1], p->base + DMA_DBSB); + writel_relaxed(p->dbt[1], p->base + DMA_DBTB); + writel_relaxed(p->dcsr, p->base + DMA_DCSR_S); + } + + return 0; +} + +static const struct dev_pm_ops sa11x0_dma_pm_ops = { + .suspend_noirq = sa11x0_dma_suspend, + .resume_noirq = sa11x0_dma_resume, + .freeze_noirq = sa11x0_dma_suspend, + .thaw_noirq = sa11x0_dma_resume, + .poweroff_noirq = sa11x0_dma_suspend, + .restore_noirq = sa11x0_dma_resume, +}; + +static struct platform_driver sa11x0_dma_driver = { + .driver = { + .name = "sa11x0-dma", + .pm = &sa11x0_dma_pm_ops, + }, + .probe = sa11x0_dma_probe, + .remove = sa11x0_dma_remove, +}; + +bool sa11x0_dma_filter_fn(struct dma_chan *chan, void *param) +{ + if (chan->device->dev->driver == &sa11x0_dma_driver.driver) { + struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan); + const char *p = param; + + return !strcmp(c->name, p); + } + return false; +} +EXPORT_SYMBOL(sa11x0_dma_filter_fn); + +static int __init sa11x0_dma_init(void) +{ + return platform_driver_register(&sa11x0_dma_driver); +} +subsys_initcall(sa11x0_dma_init); + +static void __exit sa11x0_dma_exit(void) +{ + platform_driver_unregister(&sa11x0_dma_driver); +} +module_exit(sa11x0_dma_exit); + +MODULE_AUTHOR("Russell King"); +MODULE_DESCRIPTION("SA-11x0 DMA driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:sa11x0-dma"); diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig new file mode 100644 index 000000000..0f371524a --- /dev/null +++ b/drivers/dma/sh/Kconfig @@ -0,0 +1,69 @@ +# +# DMA engine configuration for sh +# + +config RENESAS_DMA + bool + select DMA_ENGINE + +# +# DMA Engine Helpers +# + +config SH_DMAE_BASE + bool "Renesas SuperH DMA Engine support" + depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST + depends on !SUPERH || SH_DMA + depends on !SH_DMA_API + default y + select RENESAS_DMA + help + Enable support for the Renesas SuperH DMA controllers. + +# +# DMA Controllers +# + +config SH_DMAE + tristate "Renesas SuperH DMAC support" + depends on SH_DMAE_BASE + help + Enable support for the Renesas SuperH DMA controllers. + +if SH_DMAE + +config SH_DMAE_R8A73A4 + def_bool y + depends on ARCH_R8A73A4 + depends on OF + +endif + +config SUDMAC + tristate "Renesas SUDMAC support" + depends on SH_DMAE_BASE + help + Enable support for the Renesas SUDMAC controllers. + +config RCAR_HPB_DMAE + tristate "Renesas R-Car HPB DMAC support" + depends on SH_DMAE_BASE + help + Enable support for the Renesas R-Car series DMA controllers. + +config RCAR_DMAC + tristate "Renesas R-Car Gen2 DMA Controller" + depends on ARCH_SHMOBILE || COMPILE_TEST + select RENESAS_DMA + help + This driver supports the general purpose DMA controller found in the + Renesas R-Car second generation SoCs. + +config RENESAS_USB_DMAC + tristate "Renesas USB-DMA Controller" + depends on ARCH_SHMOBILE || COMPILE_TEST + select RENESAS_DMA + select DMA_VIRTUAL_CHANNELS + help + This driver supports the USB-DMA controller found in the Renesas + SoCs. diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile new file mode 100644 index 000000000..b8a598066 --- /dev/null +++ b/drivers/dma/sh/Makefile @@ -0,0 +1,19 @@ +# +# DMA Engine Helpers +# + +obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o + +# +# DMA Controllers +# + +shdma-y := shdmac.o +shdma-$(CONFIG_SH_DMAE_R8A73A4) += shdma-r8a73a4.o +shdma-objs := $(shdma-y) +obj-$(CONFIG_SH_DMAE) += shdma.o + +obj-$(CONFIG_SUDMAC) += sudmac.o +obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o +obj-$(CONFIG_RCAR_DMAC) += rcar-dmac.o +obj-$(CONFIG_RENESAS_USB_DMAC) += usb-dmac.o diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c new file mode 100644 index 000000000..a18d16cc4 --- /dev/null +++ b/drivers/dma/sh/rcar-dmac.c @@ -0,0 +1,1770 @@ +/* + * Renesas R-Car Gen2 DMA Controller Driver + * + * Copyright (C) 2014 Renesas Electronics Inc. + * + * Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * + * This is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "../dmaengine.h" + +/* + * struct rcar_dmac_xfer_chunk - Descriptor for a hardware transfer + * @node: entry in the parent's chunks list + * @src_addr: device source address + * @dst_addr: device destination address + * @size: transfer size in bytes + */ +struct rcar_dmac_xfer_chunk { + struct list_head node; + + dma_addr_t src_addr; + dma_addr_t dst_addr; + u32 size; +}; + +/* + * struct rcar_dmac_hw_desc - Hardware descriptor for a transfer chunk + * @sar: value of the SAR register (source address) + * @dar: value of the DAR register (destination address) + * @tcr: value of the TCR register (transfer count) + */ +struct rcar_dmac_hw_desc { + u32 sar; + u32 dar; + u32 tcr; + u32 reserved; +} __attribute__((__packed__)); + +/* + * struct rcar_dmac_desc - R-Car Gen2 DMA Transfer Descriptor + * @async_tx: base DMA asynchronous transaction descriptor + * @direction: direction of the DMA transfer + * @xfer_shift: log2 of the transfer size + * @chcr: value of the channel configuration register for this transfer + * @node: entry in the channel's descriptors lists + * @chunks: list of transfer chunks for this transfer + * @running: the transfer chunk being currently processed + * @nchunks: number of transfer chunks for this transfer + * @hwdescs.use: whether the transfer descriptor uses hardware descriptors + * @hwdescs.mem: hardware descriptors memory for the transfer + * @hwdescs.dma: device address of the hardware descriptors memory + * @hwdescs.size: size of the hardware descriptors in bytes + * @size: transfer size in bytes + * @cyclic: when set indicates that the DMA transfer is cyclic + */ +struct rcar_dmac_desc { + struct dma_async_tx_descriptor async_tx; + enum dma_transfer_direction direction; + unsigned int xfer_shift; + u32 chcr; + + struct list_head node; + struct list_head chunks; + struct rcar_dmac_xfer_chunk *running; + unsigned int nchunks; + + struct { + bool use; + struct rcar_dmac_hw_desc *mem; + dma_addr_t dma; + size_t size; + } hwdescs; + + unsigned int size; + bool cyclic; +}; + +#define to_rcar_dmac_desc(d) container_of(d, struct rcar_dmac_desc, async_tx) + +/* + * struct rcar_dmac_desc_page - One page worth of descriptors + * @node: entry in the channel's pages list + * @descs: array of DMA descriptors + * @chunks: array of transfer chunk descriptors + */ +struct rcar_dmac_desc_page { + struct list_head node; + + union { + struct rcar_dmac_desc descs[0]; + struct rcar_dmac_xfer_chunk chunks[0]; + }; +}; + +#define RCAR_DMAC_DESCS_PER_PAGE \ + ((PAGE_SIZE - offsetof(struct rcar_dmac_desc_page, descs)) / \ + sizeof(struct rcar_dmac_desc)) +#define RCAR_DMAC_XFER_CHUNKS_PER_PAGE \ + ((PAGE_SIZE - offsetof(struct rcar_dmac_desc_page, chunks)) / \ + sizeof(struct rcar_dmac_xfer_chunk)) + +/* + * struct rcar_dmac_chan - R-Car Gen2 DMA Controller Channel + * @chan: base DMA channel object + * @iomem: channel I/O memory base + * @index: index of this channel in the controller + * @src_xfer_size: size (in bytes) of hardware transfers on the source side + * @dst_xfer_size: size (in bytes) of hardware transfers on the destination side + * @src_slave_addr: slave source memory address + * @dst_slave_addr: slave destination memory address + * @mid_rid: hardware MID/RID for the DMA client using this channel + * @lock: protects the channel CHCR register and the desc members + * @desc.free: list of free descriptors + * @desc.pending: list of pending descriptors (submitted with tx_submit) + * @desc.active: list of active descriptors (activated with issue_pending) + * @desc.done: list of completed descriptors + * @desc.wait: list of descriptors waiting for an ack + * @desc.running: the descriptor being processed (a member of the active list) + * @desc.chunks_free: list of free transfer chunk descriptors + * @desc.pages: list of pages used by allocated descriptors + */ +struct rcar_dmac_chan { + struct dma_chan chan; + void __iomem *iomem; + unsigned int index; + + unsigned int src_xfer_size; + unsigned int dst_xfer_size; + dma_addr_t src_slave_addr; + dma_addr_t dst_slave_addr; + int mid_rid; + + spinlock_t lock; + + struct { + struct list_head free; + struct list_head pending; + struct list_head active; + struct list_head done; + struct list_head wait; + struct rcar_dmac_desc *running; + + struct list_head chunks_free; + + struct list_head pages; + } desc; +}; + +#define to_rcar_dmac_chan(c) container_of(c, struct rcar_dmac_chan, chan) + +/* + * struct rcar_dmac - R-Car Gen2 DMA Controller + * @engine: base DMA engine object + * @dev: the hardware device + * @iomem: remapped I/O memory base + * @n_channels: number of available channels + * @channels: array of DMAC channels + * @modules: bitmask of client modules in use + */ +struct rcar_dmac { + struct dma_device engine; + struct device *dev; + void __iomem *iomem; + + unsigned int n_channels; + struct rcar_dmac_chan *channels; + + unsigned long modules[256 / BITS_PER_LONG]; +}; + +#define to_rcar_dmac(d) container_of(d, struct rcar_dmac, engine) + +/* ----------------------------------------------------------------------------- + * Registers + */ + +#define RCAR_DMAC_CHAN_OFFSET(i) (0x8000 + 0x80 * (i)) + +#define RCAR_DMAISTA 0x0020 +#define RCAR_DMASEC 0x0030 +#define RCAR_DMAOR 0x0060 +#define RCAR_DMAOR_PRI_FIXED (0 << 8) +#define RCAR_DMAOR_PRI_ROUND_ROBIN (3 << 8) +#define RCAR_DMAOR_AE (1 << 2) +#define RCAR_DMAOR_DME (1 << 0) +#define RCAR_DMACHCLR 0x0080 +#define RCAR_DMADPSEC 0x00a0 + +#define RCAR_DMASAR 0x0000 +#define RCAR_DMADAR 0x0004 +#define RCAR_DMATCR 0x0008 +#define RCAR_DMATCR_MASK 0x00ffffff +#define RCAR_DMATSR 0x0028 +#define RCAR_DMACHCR 0x000c +#define RCAR_DMACHCR_CAE (1 << 31) +#define RCAR_DMACHCR_CAIE (1 << 30) +#define RCAR_DMACHCR_DPM_DISABLED (0 << 28) +#define RCAR_DMACHCR_DPM_ENABLED (1 << 28) +#define RCAR_DMACHCR_DPM_REPEAT (2 << 28) +#define RCAR_DMACHCR_DPM_INFINITE (3 << 28) +#define RCAR_DMACHCR_RPT_SAR (1 << 27) +#define RCAR_DMACHCR_RPT_DAR (1 << 26) +#define RCAR_DMACHCR_RPT_TCR (1 << 25) +#define RCAR_DMACHCR_DPB (1 << 22) +#define RCAR_DMACHCR_DSE (1 << 19) +#define RCAR_DMACHCR_DSIE (1 << 18) +#define RCAR_DMACHCR_TS_1B ((0 << 20) | (0 << 3)) +#define RCAR_DMACHCR_TS_2B ((0 << 20) | (1 << 3)) +#define RCAR_DMACHCR_TS_4B ((0 << 20) | (2 << 3)) +#define RCAR_DMACHCR_TS_16B ((0 << 20) | (3 << 3)) +#define RCAR_DMACHCR_TS_32B ((1 << 20) | (0 << 3)) +#define RCAR_DMACHCR_TS_64B ((1 << 20) | (1 << 3)) +#define RCAR_DMACHCR_TS_8B ((1 << 20) | (3 << 3)) +#define RCAR_DMACHCR_DM_FIXED (0 << 14) +#define RCAR_DMACHCR_DM_INC (1 << 14) +#define RCAR_DMACHCR_DM_DEC (2 << 14) +#define RCAR_DMACHCR_SM_FIXED (0 << 12) +#define RCAR_DMACHCR_SM_INC (1 << 12) +#define RCAR_DMACHCR_SM_DEC (2 << 12) +#define RCAR_DMACHCR_RS_AUTO (4 << 8) +#define RCAR_DMACHCR_RS_DMARS (8 << 8) +#define RCAR_DMACHCR_IE (1 << 2) +#define RCAR_DMACHCR_TE (1 << 1) +#define RCAR_DMACHCR_DE (1 << 0) +#define RCAR_DMATCRB 0x0018 +#define RCAR_DMATSRB 0x0038 +#define RCAR_DMACHCRB 0x001c +#define RCAR_DMACHCRB_DCNT(n) ((n) << 24) +#define RCAR_DMACHCRB_DPTR_MASK (0xff << 16) +#define RCAR_DMACHCRB_DPTR_SHIFT 16 +#define RCAR_DMACHCRB_DRST (1 << 15) +#define RCAR_DMACHCRB_DTS (1 << 8) +#define RCAR_DMACHCRB_SLM_NORMAL (0 << 4) +#define RCAR_DMACHCRB_SLM_CLK(n) ((8 | (n)) << 4) +#define RCAR_DMACHCRB_PRI(n) ((n) << 0) +#define RCAR_DMARS 0x0040 +#define RCAR_DMABUFCR 0x0048 +#define RCAR_DMABUFCR_MBU(n) ((n) << 16) +#define RCAR_DMABUFCR_ULB(n) ((n) << 0) +#define RCAR_DMADPBASE 0x0050 +#define RCAR_DMADPBASE_MASK 0xfffffff0 +#define RCAR_DMADPBASE_SEL (1 << 0) +#define RCAR_DMADPCR 0x0054 +#define RCAR_DMADPCR_DIPT(n) ((n) << 24) +#define RCAR_DMAFIXSAR 0x0010 +#define RCAR_DMAFIXDAR 0x0014 +#define RCAR_DMAFIXDPBASE 0x0060 + +/* Hardcode the MEMCPY transfer size to 4 bytes. */ +#define RCAR_DMAC_MEMCPY_XFER_SIZE 4 + +/* ----------------------------------------------------------------------------- + * Device access + */ + +static void rcar_dmac_write(struct rcar_dmac *dmac, u32 reg, u32 data) +{ + if (reg == RCAR_DMAOR) + writew(data, dmac->iomem + reg); + else + writel(data, dmac->iomem + reg); +} + +static u32 rcar_dmac_read(struct rcar_dmac *dmac, u32 reg) +{ + if (reg == RCAR_DMAOR) + return readw(dmac->iomem + reg); + else + return readl(dmac->iomem + reg); +} + +static u32 rcar_dmac_chan_read(struct rcar_dmac_chan *chan, u32 reg) +{ + if (reg == RCAR_DMARS) + return readw(chan->iomem + reg); + else + return readl(chan->iomem + reg); +} + +static void rcar_dmac_chan_write(struct rcar_dmac_chan *chan, u32 reg, u32 data) +{ + if (reg == RCAR_DMARS) + writew(data, chan->iomem + reg); + else + writel(data, chan->iomem + reg); +} + +/* ----------------------------------------------------------------------------- + * Initialization and configuration + */ + +static bool rcar_dmac_chan_is_busy(struct rcar_dmac_chan *chan) +{ + u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR); + + return (chcr & (RCAR_DMACHCR_DE | RCAR_DMACHCR_TE)) == RCAR_DMACHCR_DE; +} + +static void rcar_dmac_chan_start_xfer(struct rcar_dmac_chan *chan) +{ + struct rcar_dmac_desc *desc = chan->desc.running; + u32 chcr = desc->chcr; + + WARN_ON_ONCE(rcar_dmac_chan_is_busy(chan)); + + if (chan->mid_rid >= 0) + rcar_dmac_chan_write(chan, RCAR_DMARS, chan->mid_rid); + + if (desc->hwdescs.use) { + struct rcar_dmac_xfer_chunk *chunk; + + dev_dbg(chan->chan.device->dev, + "chan%u: queue desc %p: %u@%pad\n", + chan->index, desc, desc->nchunks, &desc->hwdescs.dma); + +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + rcar_dmac_chan_write(chan, RCAR_DMAFIXDPBASE, + desc->hwdescs.dma >> 32); +#endif + rcar_dmac_chan_write(chan, RCAR_DMADPBASE, + (desc->hwdescs.dma & 0xfffffff0) | + RCAR_DMADPBASE_SEL); + rcar_dmac_chan_write(chan, RCAR_DMACHCRB, + RCAR_DMACHCRB_DCNT(desc->nchunks - 1) | + RCAR_DMACHCRB_DRST); + + /* + * Errata: When descriptor memory is accessed through an IOMMU + * the DMADAR register isn't initialized automatically from the + * first descriptor at beginning of transfer by the DMAC like it + * should. Initialize it manually with the destination address + * of the first chunk. + */ + chunk = list_first_entry(&desc->chunks, + struct rcar_dmac_xfer_chunk, node); + rcar_dmac_chan_write(chan, RCAR_DMADAR, + chunk->dst_addr & 0xffffffff); + + /* + * Program the descriptor stage interrupt to occur after the end + * of the first stage. + */ + rcar_dmac_chan_write(chan, RCAR_DMADPCR, RCAR_DMADPCR_DIPT(1)); + + chcr |= RCAR_DMACHCR_RPT_SAR | RCAR_DMACHCR_RPT_DAR + | RCAR_DMACHCR_RPT_TCR | RCAR_DMACHCR_DPB; + + /* + * If the descriptor isn't cyclic enable normal descriptor mode + * and the transfer completion interrupt. + */ + if (!desc->cyclic) + chcr |= RCAR_DMACHCR_DPM_ENABLED | RCAR_DMACHCR_IE; + /* + * If the descriptor is cyclic and has a callback enable the + * descriptor stage interrupt in infinite repeat mode. + */ + else if (desc->async_tx.callback) + chcr |= RCAR_DMACHCR_DPM_INFINITE | RCAR_DMACHCR_DSIE; + /* + * Otherwise just select infinite repeat mode without any + * interrupt. + */ + else + chcr |= RCAR_DMACHCR_DPM_INFINITE; + } else { + struct rcar_dmac_xfer_chunk *chunk = desc->running; + + dev_dbg(chan->chan.device->dev, + "chan%u: queue chunk %p: %u@%pad -> %pad\n", + chan->index, chunk, chunk->size, &chunk->src_addr, + &chunk->dst_addr); + +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + rcar_dmac_chan_write(chan, RCAR_DMAFIXSAR, + chunk->src_addr >> 32); + rcar_dmac_chan_write(chan, RCAR_DMAFIXDAR, + chunk->dst_addr >> 32); +#endif + rcar_dmac_chan_write(chan, RCAR_DMASAR, + chunk->src_addr & 0xffffffff); + rcar_dmac_chan_write(chan, RCAR_DMADAR, + chunk->dst_addr & 0xffffffff); + rcar_dmac_chan_write(chan, RCAR_DMATCR, + chunk->size >> desc->xfer_shift); + + chcr |= RCAR_DMACHCR_DPM_DISABLED | RCAR_DMACHCR_IE; + } + + rcar_dmac_chan_write(chan, RCAR_DMACHCR, chcr | RCAR_DMACHCR_DE); +} + +static int rcar_dmac_init(struct rcar_dmac *dmac) +{ + u16 dmaor; + + /* Clear all channels and enable the DMAC globally. */ + rcar_dmac_write(dmac, RCAR_DMACHCLR, 0x7fff); + rcar_dmac_write(dmac, RCAR_DMAOR, + RCAR_DMAOR_PRI_FIXED | RCAR_DMAOR_DME); + + dmaor = rcar_dmac_read(dmac, RCAR_DMAOR); + if ((dmaor & (RCAR_DMAOR_AE | RCAR_DMAOR_DME)) != RCAR_DMAOR_DME) { + dev_warn(dmac->dev, "DMAOR initialization failed.\n"); + return -EIO; + } + + return 0; +} + +/* ----------------------------------------------------------------------------- + * Descriptors submission + */ + +static dma_cookie_t rcar_dmac_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct rcar_dmac_chan *chan = to_rcar_dmac_chan(tx->chan); + struct rcar_dmac_desc *desc = to_rcar_dmac_desc(tx); + unsigned long flags; + dma_cookie_t cookie; + + spin_lock_irqsave(&chan->lock, flags); + + cookie = dma_cookie_assign(tx); + + dev_dbg(chan->chan.device->dev, "chan%u: submit #%d@%p\n", + chan->index, tx->cookie, desc); + + list_add_tail(&desc->node, &chan->desc.pending); + desc->running = list_first_entry(&desc->chunks, + struct rcar_dmac_xfer_chunk, node); + + spin_unlock_irqrestore(&chan->lock, flags); + + return cookie; +} + +/* ----------------------------------------------------------------------------- + * Descriptors allocation and free + */ + +/* + * rcar_dmac_desc_alloc - Allocate a page worth of DMA descriptors + * @chan: the DMA channel + * @gfp: allocation flags + */ +static int rcar_dmac_desc_alloc(struct rcar_dmac_chan *chan, gfp_t gfp) +{ + struct rcar_dmac_desc_page *page; + LIST_HEAD(list); + unsigned int i; + + page = (void *)get_zeroed_page(gfp); + if (!page) + return -ENOMEM; + + for (i = 0; i < RCAR_DMAC_DESCS_PER_PAGE; ++i) { + struct rcar_dmac_desc *desc = &page->descs[i]; + + dma_async_tx_descriptor_init(&desc->async_tx, &chan->chan); + desc->async_tx.tx_submit = rcar_dmac_tx_submit; + INIT_LIST_HEAD(&desc->chunks); + + list_add_tail(&desc->node, &list); + } + + spin_lock_irq(&chan->lock); + list_splice_tail(&list, &chan->desc.free); + list_add_tail(&page->node, &chan->desc.pages); + spin_unlock_irq(&chan->lock); + + return 0; +} + +/* + * rcar_dmac_desc_put - Release a DMA transfer descriptor + * @chan: the DMA channel + * @desc: the descriptor + * + * Put the descriptor and its transfer chunk descriptors back in the channel's + * free descriptors lists. The descriptor's chunks list will be reinitialized to + * an empty list as a result. + * + * The descriptor must have been removed from the channel's lists before calling + * this function. + */ +static void rcar_dmac_desc_put(struct rcar_dmac_chan *chan, + struct rcar_dmac_desc *desc) +{ + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + list_splice_tail_init(&desc->chunks, &chan->desc.chunks_free); + list_add_tail(&desc->node, &chan->desc.free); + spin_unlock_irqrestore(&chan->lock, flags); +} + +static void rcar_dmac_desc_recycle_acked(struct rcar_dmac_chan *chan) +{ + struct rcar_dmac_desc *desc, *_desc; + LIST_HEAD(list); + + /* + * We have to temporarily move all descriptors from the wait list to a + * local list as iterating over the wait list, even with + * list_for_each_entry_safe, isn't safe if we release the channel lock + * around the rcar_dmac_desc_put() call. + */ + spin_lock_irq(&chan->lock); + list_splice_init(&chan->desc.wait, &list); + spin_unlock_irq(&chan->lock); + + list_for_each_entry_safe(desc, _desc, &list, node) { + if (async_tx_test_ack(&desc->async_tx)) { + list_del(&desc->node); + rcar_dmac_desc_put(chan, desc); + } + } + + if (list_empty(&list)) + return; + + /* Put the remaining descriptors back in the wait list. */ + spin_lock_irq(&chan->lock); + list_splice(&list, &chan->desc.wait); + spin_unlock_irq(&chan->lock); +} + +/* + * rcar_dmac_desc_get - Allocate a descriptor for a DMA transfer + * @chan: the DMA channel + * + * Locking: This function must be called in a non-atomic context. + * + * Return: A pointer to the allocated descriptor or NULL if no descriptor can + * be allocated. + */ +static struct rcar_dmac_desc *rcar_dmac_desc_get(struct rcar_dmac_chan *chan) +{ + struct rcar_dmac_desc *desc; + int ret; + + /* Recycle acked descriptors before attempting allocation. */ + rcar_dmac_desc_recycle_acked(chan); + + spin_lock_irq(&chan->lock); + + while (list_empty(&chan->desc.free)) { + /* + * No free descriptors, allocate a page worth of them and try + * again, as someone else could race us to get the newly + * allocated descriptors. If the allocation fails return an + * error. + */ + spin_unlock_irq(&chan->lock); + ret = rcar_dmac_desc_alloc(chan, GFP_NOWAIT); + if (ret < 0) + return NULL; + spin_lock_irq(&chan->lock); + } + + desc = list_first_entry(&chan->desc.free, struct rcar_dmac_desc, node); + list_del(&desc->node); + + spin_unlock_irq(&chan->lock); + + return desc; +} + +/* + * rcar_dmac_xfer_chunk_alloc - Allocate a page worth of transfer chunks + * @chan: the DMA channel + * @gfp: allocation flags + */ +static int rcar_dmac_xfer_chunk_alloc(struct rcar_dmac_chan *chan, gfp_t gfp) +{ + struct rcar_dmac_desc_page *page; + LIST_HEAD(list); + unsigned int i; + + page = (void *)get_zeroed_page(gfp); + if (!page) + return -ENOMEM; + + for (i = 0; i < RCAR_DMAC_XFER_CHUNKS_PER_PAGE; ++i) { + struct rcar_dmac_xfer_chunk *chunk = &page->chunks[i]; + + list_add_tail(&chunk->node, &list); + } + + spin_lock_irq(&chan->lock); + list_splice_tail(&list, &chan->desc.chunks_free); + list_add_tail(&page->node, &chan->desc.pages); + spin_unlock_irq(&chan->lock); + + return 0; +} + +/* + * rcar_dmac_xfer_chunk_get - Allocate a transfer chunk for a DMA transfer + * @chan: the DMA channel + * + * Locking: This function must be called in a non-atomic context. + * + * Return: A pointer to the allocated transfer chunk descriptor or NULL if no + * descriptor can be allocated. + */ +static struct rcar_dmac_xfer_chunk * +rcar_dmac_xfer_chunk_get(struct rcar_dmac_chan *chan) +{ + struct rcar_dmac_xfer_chunk *chunk; + int ret; + + spin_lock_irq(&chan->lock); + + while (list_empty(&chan->desc.chunks_free)) { + /* + * No free descriptors, allocate a page worth of them and try + * again, as someone else could race us to get the newly + * allocated descriptors. If the allocation fails return an + * error. + */ + spin_unlock_irq(&chan->lock); + ret = rcar_dmac_xfer_chunk_alloc(chan, GFP_NOWAIT); + if (ret < 0) + return NULL; + spin_lock_irq(&chan->lock); + } + + chunk = list_first_entry(&chan->desc.chunks_free, + struct rcar_dmac_xfer_chunk, node); + list_del(&chunk->node); + + spin_unlock_irq(&chan->lock); + + return chunk; +} + +static void rcar_dmac_realloc_hwdesc(struct rcar_dmac_chan *chan, + struct rcar_dmac_desc *desc, size_t size) +{ + /* + * dma_alloc_coherent() allocates memory in page size increments. To + * avoid reallocating the hardware descriptors when the allocated size + * wouldn't change align the requested size to a multiple of the page + * size. + */ + size = PAGE_ALIGN(size); + + if (desc->hwdescs.size == size) + return; + + if (desc->hwdescs.mem) { + dma_free_coherent(chan->chan.device->dev, desc->hwdescs.size, + desc->hwdescs.mem, desc->hwdescs.dma); + desc->hwdescs.mem = NULL; + desc->hwdescs.size = 0; + } + + if (!size) + return; + + desc->hwdescs.mem = dma_alloc_coherent(chan->chan.device->dev, size, + &desc->hwdescs.dma, GFP_NOWAIT); + if (!desc->hwdescs.mem) + return; + + desc->hwdescs.size = size; +} + +static int rcar_dmac_fill_hwdesc(struct rcar_dmac_chan *chan, + struct rcar_dmac_desc *desc) +{ + struct rcar_dmac_xfer_chunk *chunk; + struct rcar_dmac_hw_desc *hwdesc; + + rcar_dmac_realloc_hwdesc(chan, desc, desc->nchunks * sizeof(*hwdesc)); + + hwdesc = desc->hwdescs.mem; + if (!hwdesc) + return -ENOMEM; + + list_for_each_entry(chunk, &desc->chunks, node) { + hwdesc->sar = chunk->src_addr; + hwdesc->dar = chunk->dst_addr; + hwdesc->tcr = chunk->size >> desc->xfer_shift; + hwdesc++; + } + + return 0; +} + +/* ----------------------------------------------------------------------------- + * Stop and reset + */ + +static void rcar_dmac_chan_halt(struct rcar_dmac_chan *chan) +{ + u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR); + + chcr &= ~(RCAR_DMACHCR_DSE | RCAR_DMACHCR_DSIE | RCAR_DMACHCR_IE | + RCAR_DMACHCR_TE | RCAR_DMACHCR_DE); + rcar_dmac_chan_write(chan, RCAR_DMACHCR, chcr); +} + +static void rcar_dmac_chan_reinit(struct rcar_dmac_chan *chan) +{ + struct rcar_dmac_desc *desc, *_desc; + unsigned long flags; + LIST_HEAD(descs); + + spin_lock_irqsave(&chan->lock, flags); + + /* Move all non-free descriptors to the local lists. */ + list_splice_init(&chan->desc.pending, &descs); + list_splice_init(&chan->desc.active, &descs); + list_splice_init(&chan->desc.done, &descs); + list_splice_init(&chan->desc.wait, &descs); + + chan->desc.running = NULL; + + spin_unlock_irqrestore(&chan->lock, flags); + + list_for_each_entry_safe(desc, _desc, &descs, node) { + list_del(&desc->node); + rcar_dmac_desc_put(chan, desc); + } +} + +static void rcar_dmac_stop(struct rcar_dmac *dmac) +{ + rcar_dmac_write(dmac, RCAR_DMAOR, 0); +} + +static void rcar_dmac_abort(struct rcar_dmac *dmac) +{ + unsigned int i; + + /* Stop all channels. */ + for (i = 0; i < dmac->n_channels; ++i) { + struct rcar_dmac_chan *chan = &dmac->channels[i]; + + /* Stop and reinitialize the channel. */ + spin_lock(&chan->lock); + rcar_dmac_chan_halt(chan); + spin_unlock(&chan->lock); + + rcar_dmac_chan_reinit(chan); + } +} + +/* ----------------------------------------------------------------------------- + * Descriptors preparation + */ + +static void rcar_dmac_chan_configure_desc(struct rcar_dmac_chan *chan, + struct rcar_dmac_desc *desc) +{ + static const u32 chcr_ts[] = { + RCAR_DMACHCR_TS_1B, RCAR_DMACHCR_TS_2B, + RCAR_DMACHCR_TS_4B, RCAR_DMACHCR_TS_8B, + RCAR_DMACHCR_TS_16B, RCAR_DMACHCR_TS_32B, + RCAR_DMACHCR_TS_64B, + }; + + unsigned int xfer_size; + u32 chcr; + + switch (desc->direction) { + case DMA_DEV_TO_MEM: + chcr = RCAR_DMACHCR_DM_INC | RCAR_DMACHCR_SM_FIXED + | RCAR_DMACHCR_RS_DMARS; + xfer_size = chan->src_xfer_size; + break; + + case DMA_MEM_TO_DEV: + chcr = RCAR_DMACHCR_DM_FIXED | RCAR_DMACHCR_SM_INC + | RCAR_DMACHCR_RS_DMARS; + xfer_size = chan->dst_xfer_size; + break; + + case DMA_MEM_TO_MEM: + default: + chcr = RCAR_DMACHCR_DM_INC | RCAR_DMACHCR_SM_INC + | RCAR_DMACHCR_RS_AUTO; + xfer_size = RCAR_DMAC_MEMCPY_XFER_SIZE; + break; + } + + desc->xfer_shift = ilog2(xfer_size); + desc->chcr = chcr | chcr_ts[desc->xfer_shift]; +} + +/* + * rcar_dmac_chan_prep_sg - prepare transfer descriptors from an SG list + * + * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also + * converted to scatter-gather to guarantee consistent locking and a correct + * list manipulation. For slave DMA direction carries the usual meaning, and, + * logically, the SG list is RAM and the addr variable contains slave address, + * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM + * and the SG list contains only one element and points at the source buffer. + */ +static struct dma_async_tx_descriptor * +rcar_dmac_chan_prep_sg(struct rcar_dmac_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, dma_addr_t dev_addr, + enum dma_transfer_direction dir, unsigned long dma_flags, + bool cyclic) +{ + struct rcar_dmac_xfer_chunk *chunk; + struct rcar_dmac_desc *desc; + struct scatterlist *sg; + unsigned int nchunks = 0; + unsigned int max_chunk_size; + unsigned int full_size = 0; + bool highmem = false; + unsigned int i; + + desc = rcar_dmac_desc_get(chan); + if (!desc) + return NULL; + + desc->async_tx.flags = dma_flags; + desc->async_tx.cookie = -EBUSY; + + desc->cyclic = cyclic; + desc->direction = dir; + + rcar_dmac_chan_configure_desc(chan, desc); + + max_chunk_size = (RCAR_DMATCR_MASK + 1) << desc->xfer_shift; + + /* + * Allocate and fill the transfer chunk descriptors. We own the only + * reference to the DMA descriptor, there's no need for locking. + */ + for_each_sg(sgl, sg, sg_len, i) { + dma_addr_t mem_addr = sg_dma_address(sg); + unsigned int len = sg_dma_len(sg); + + full_size += len; + + while (len) { + unsigned int size = min(len, max_chunk_size); + +#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT + /* + * Prevent individual transfers from crossing 4GB + * boundaries. + */ + if (dev_addr >> 32 != (dev_addr + size - 1) >> 32) + size = ALIGN(dev_addr, 1ULL << 32) - dev_addr; + if (mem_addr >> 32 != (mem_addr + size - 1) >> 32) + size = ALIGN(mem_addr, 1ULL << 32) - mem_addr; + + /* + * Check if either of the source or destination address + * can't be expressed in 32 bits. If so we can't use + * hardware descriptor lists. + */ + if (dev_addr >> 32 || mem_addr >> 32) + highmem = true; +#endif + + chunk = rcar_dmac_xfer_chunk_get(chan); + if (!chunk) { + rcar_dmac_desc_put(chan, desc); + return NULL; + } + + if (dir == DMA_DEV_TO_MEM) { + chunk->src_addr = dev_addr; + chunk->dst_addr = mem_addr; + } else { + chunk->src_addr = mem_addr; + chunk->dst_addr = dev_addr; + } + + chunk->size = size; + + dev_dbg(chan->chan.device->dev, + "chan%u: chunk %p/%p sgl %u@%p, %u/%u %pad -> %pad\n", + chan->index, chunk, desc, i, sg, size, len, + &chunk->src_addr, &chunk->dst_addr); + + mem_addr += size; + if (dir == DMA_MEM_TO_MEM) + dev_addr += size; + + len -= size; + + list_add_tail(&chunk->node, &desc->chunks); + nchunks++; + } + } + + desc->nchunks = nchunks; + desc->size = full_size; + + /* + * Use hardware descriptor lists if possible when more than one chunk + * needs to be transferred (otherwise they don't make much sense). + * + * The highmem check currently covers the whole transfer. As an + * optimization we could use descriptor lists for consecutive lowmem + * chunks and direct manual mode for highmem chunks. Whether the + * performance improvement would be significant enough compared to the + * additional complexity remains to be investigated. + */ + desc->hwdescs.use = !highmem && nchunks > 1; + if (desc->hwdescs.use) { + if (rcar_dmac_fill_hwdesc(chan, desc) < 0) + desc->hwdescs.use = false; + } + + return &desc->async_tx; +} + +/* ----------------------------------------------------------------------------- + * DMA engine operations + */ + +static int rcar_dmac_alloc_chan_resources(struct dma_chan *chan) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + int ret; + + INIT_LIST_HEAD(&rchan->desc.chunks_free); + INIT_LIST_HEAD(&rchan->desc.pages); + + /* Preallocate descriptors. */ + ret = rcar_dmac_xfer_chunk_alloc(rchan, GFP_KERNEL); + if (ret < 0) + return -ENOMEM; + + ret = rcar_dmac_desc_alloc(rchan, GFP_KERNEL); + if (ret < 0) + return -ENOMEM; + + return pm_runtime_get_sync(chan->device->dev); +} + +static void rcar_dmac_free_chan_resources(struct dma_chan *chan) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + struct rcar_dmac *dmac = to_rcar_dmac(chan->device); + struct rcar_dmac_desc_page *page, *_page; + struct rcar_dmac_desc *desc; + LIST_HEAD(list); + + /* Protect against ISR */ + spin_lock_irq(&rchan->lock); + rcar_dmac_chan_halt(rchan); + spin_unlock_irq(&rchan->lock); + + /* Now no new interrupts will occur */ + + if (rchan->mid_rid >= 0) { + /* The caller is holding dma_list_mutex */ + clear_bit(rchan->mid_rid, dmac->modules); + rchan->mid_rid = -EINVAL; + } + + list_splice_init(&rchan->desc.free, &list); + list_splice_init(&rchan->desc.pending, &list); + list_splice_init(&rchan->desc.active, &list); + list_splice_init(&rchan->desc.done, &list); + list_splice_init(&rchan->desc.wait, &list); + + list_for_each_entry(desc, &list, node) + rcar_dmac_realloc_hwdesc(rchan, desc, 0); + + list_for_each_entry_safe(page, _page, &rchan->desc.pages, node) { + list_del(&page->node); + free_page((unsigned long)page); + } + + pm_runtime_put(chan->device->dev); +} + +static struct dma_async_tx_descriptor * +rcar_dmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dma_dest, + dma_addr_t dma_src, size_t len, unsigned long flags) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + struct scatterlist sgl; + + if (!len) + return NULL; + + sg_init_table(&sgl, 1); + sg_set_page(&sgl, pfn_to_page(PFN_DOWN(dma_src)), len, + offset_in_page(dma_src)); + sg_dma_address(&sgl) = dma_src; + sg_dma_len(&sgl) = len; + + return rcar_dmac_chan_prep_sg(rchan, &sgl, 1, dma_dest, + DMA_MEM_TO_MEM, flags, false); +} + +static struct dma_async_tx_descriptor * +rcar_dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction dir, + unsigned long flags, void *context) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + dma_addr_t dev_addr; + + /* Someone calling slave DMA on a generic channel? */ + if (rchan->mid_rid < 0 || !sg_len) { + dev_warn(chan->device->dev, + "%s: bad parameter: len=%d, id=%d\n", + __func__, sg_len, rchan->mid_rid); + return NULL; + } + + dev_addr = dir == DMA_DEV_TO_MEM + ? rchan->src_slave_addr : rchan->dst_slave_addr; + return rcar_dmac_chan_prep_sg(rchan, sgl, sg_len, dev_addr, + dir, flags, false); +} + +#define RCAR_DMAC_MAX_SG_LEN 32 + +static struct dma_async_tx_descriptor * +rcar_dmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, + size_t buf_len, size_t period_len, + enum dma_transfer_direction dir, unsigned long flags) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + struct dma_async_tx_descriptor *desc; + struct scatterlist *sgl; + dma_addr_t dev_addr; + unsigned int sg_len; + unsigned int i; + + /* Someone calling slave DMA on a generic channel? */ + if (rchan->mid_rid < 0 || buf_len < period_len) { + dev_warn(chan->device->dev, + "%s: bad parameter: buf_len=%zu, period_len=%zu, id=%d\n", + __func__, buf_len, period_len, rchan->mid_rid); + return NULL; + } + + sg_len = buf_len / period_len; + if (sg_len > RCAR_DMAC_MAX_SG_LEN) { + dev_err(chan->device->dev, + "chan%u: sg length %d exceds limit %d", + rchan->index, sg_len, RCAR_DMAC_MAX_SG_LEN); + return NULL; + } + + /* + * Allocate the sg list dynamically as it would consume too much stack + * space. + */ + sgl = kcalloc(sg_len, sizeof(*sgl), GFP_NOWAIT); + if (!sgl) + return NULL; + + sg_init_table(sgl, sg_len); + + for (i = 0; i < sg_len; ++i) { + dma_addr_t src = buf_addr + (period_len * i); + + sg_set_page(&sgl[i], pfn_to_page(PFN_DOWN(src)), period_len, + offset_in_page(src)); + sg_dma_address(&sgl[i]) = src; + sg_dma_len(&sgl[i]) = period_len; + } + + dev_addr = dir == DMA_DEV_TO_MEM + ? rchan->src_slave_addr : rchan->dst_slave_addr; + desc = rcar_dmac_chan_prep_sg(rchan, sgl, sg_len, dev_addr, + dir, flags, true); + + kfree(sgl); + return desc; +} + +static int rcar_dmac_device_config(struct dma_chan *chan, + struct dma_slave_config *cfg) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + + /* + * We could lock this, but you shouldn't be configuring the + * channel, while using it... + */ + rchan->src_slave_addr = cfg->src_addr; + rchan->dst_slave_addr = cfg->dst_addr; + rchan->src_xfer_size = cfg->src_addr_width; + rchan->dst_xfer_size = cfg->dst_addr_width; + + return 0; +} + +static int rcar_dmac_chan_terminate_all(struct dma_chan *chan) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&rchan->lock, flags); + rcar_dmac_chan_halt(rchan); + spin_unlock_irqrestore(&rchan->lock, flags); + + /* + * FIXME: No new interrupt can occur now, but the IRQ thread might still + * be running. + */ + + rcar_dmac_chan_reinit(rchan); + + return 0; +} + +static unsigned int rcar_dmac_chan_get_residue(struct rcar_dmac_chan *chan, + dma_cookie_t cookie) +{ + struct rcar_dmac_desc *desc = chan->desc.running; + struct rcar_dmac_xfer_chunk *running = NULL; + struct rcar_dmac_xfer_chunk *chunk; + unsigned int residue = 0; + unsigned int dptr = 0; + + if (!desc) + return 0; + + /* + * If the cookie doesn't correspond to the currently running transfer + * then the descriptor hasn't been processed yet, and the residue is + * equal to the full descriptor size. + */ + if (cookie != desc->async_tx.cookie) + return desc->size; + + /* + * In descriptor mode the descriptor running pointer is not maintained + * by the interrupt handler, find the running descriptor from the + * descriptor pointer field in the CHCRB register. In non-descriptor + * mode just use the running descriptor pointer. + */ + if (desc->hwdescs.use) { + dptr = (rcar_dmac_chan_read(chan, RCAR_DMACHCRB) & + RCAR_DMACHCRB_DPTR_MASK) >> RCAR_DMACHCRB_DPTR_SHIFT; + WARN_ON(dptr >= desc->nchunks); + } else { + running = desc->running; + } + + /* Compute the size of all chunks still to be transferred. */ + list_for_each_entry_reverse(chunk, &desc->chunks, node) { + if (chunk == running || ++dptr == desc->nchunks) + break; + + residue += chunk->size; + } + + /* Add the residue for the current chunk. */ + residue += rcar_dmac_chan_read(chan, RCAR_DMATCR) << desc->xfer_shift; + + return residue; +} + +static enum dma_status rcar_dmac_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + enum dma_status status; + unsigned long flags; + unsigned int residue; + + status = dma_cookie_status(chan, cookie, txstate); + if (status == DMA_COMPLETE || !txstate) + return status; + + spin_lock_irqsave(&rchan->lock, flags); + residue = rcar_dmac_chan_get_residue(rchan, cookie); + spin_unlock_irqrestore(&rchan->lock, flags); + + dma_set_residue(txstate, residue); + + return status; +} + +static void rcar_dmac_issue_pending(struct dma_chan *chan) +{ + struct rcar_dmac_chan *rchan = to_rcar_dmac_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&rchan->lock, flags); + + if (list_empty(&rchan->desc.pending)) + goto done; + + /* Append the pending list to the active list. */ + list_splice_tail_init(&rchan->desc.pending, &rchan->desc.active); + + /* + * If no transfer is running pick the first descriptor from the active + * list and start the transfer. + */ + if (!rchan->desc.running) { + struct rcar_dmac_desc *desc; + + desc = list_first_entry(&rchan->desc.active, + struct rcar_dmac_desc, node); + rchan->desc.running = desc; + + rcar_dmac_chan_start_xfer(rchan); + } + +done: + spin_unlock_irqrestore(&rchan->lock, flags); +} + +/* ----------------------------------------------------------------------------- + * IRQ handling + */ + +static irqreturn_t rcar_dmac_isr_desc_stage_end(struct rcar_dmac_chan *chan) +{ + struct rcar_dmac_desc *desc = chan->desc.running; + unsigned int stage; + + if (WARN_ON(!desc || !desc->cyclic)) { + /* + * This should never happen, there should always be a running + * cyclic descriptor when a descriptor stage end interrupt is + * triggered. Warn and return. + */ + return IRQ_NONE; + } + + /* Program the interrupt pointer to the next stage. */ + stage = (rcar_dmac_chan_read(chan, RCAR_DMACHCRB) & + RCAR_DMACHCRB_DPTR_MASK) >> RCAR_DMACHCRB_DPTR_SHIFT; + rcar_dmac_chan_write(chan, RCAR_DMADPCR, RCAR_DMADPCR_DIPT(stage)); + + return IRQ_WAKE_THREAD; +} + +static irqreturn_t rcar_dmac_isr_transfer_end(struct rcar_dmac_chan *chan) +{ + struct rcar_dmac_desc *desc = chan->desc.running; + irqreturn_t ret = IRQ_WAKE_THREAD; + + if (WARN_ON_ONCE(!desc)) { + /* + * This should never happen, there should always be a running + * descriptor when a transfer end interrupt is triggered. Warn + * and return. + */ + return IRQ_NONE; + } + + /* + * The transfer end interrupt isn't generated for each chunk when using + * descriptor mode. Only update the running chunk pointer in + * non-descriptor mode. + */ + if (!desc->hwdescs.use) { + /* + * If we haven't completed the last transfer chunk simply move + * to the next one. Only wake the IRQ thread if the transfer is + * cyclic. + */ + if (!list_is_last(&desc->running->node, &desc->chunks)) { + desc->running = list_next_entry(desc->running, node); + if (!desc->cyclic) + ret = IRQ_HANDLED; + goto done; + } + + /* + * We've completed the last transfer chunk. If the transfer is + * cyclic, move back to the first one. + */ + if (desc->cyclic) { + desc->running = + list_first_entry(&desc->chunks, + struct rcar_dmac_xfer_chunk, + node); + goto done; + } + } + + /* The descriptor is complete, move it to the done list. */ + list_move_tail(&desc->node, &chan->desc.done); + + /* Queue the next descriptor, if any. */ + if (!list_empty(&chan->desc.active)) + chan->desc.running = list_first_entry(&chan->desc.active, + struct rcar_dmac_desc, + node); + else + chan->desc.running = NULL; + +done: + if (chan->desc.running) + rcar_dmac_chan_start_xfer(chan); + + return ret; +} + +static irqreturn_t rcar_dmac_isr_channel(int irq, void *dev) +{ + u32 mask = RCAR_DMACHCR_DSE | RCAR_DMACHCR_TE; + struct rcar_dmac_chan *chan = dev; + irqreturn_t ret = IRQ_NONE; + u32 chcr; + + spin_lock(&chan->lock); + + chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR); + if (chcr & RCAR_DMACHCR_TE) + mask |= RCAR_DMACHCR_DE; + rcar_dmac_chan_write(chan, RCAR_DMACHCR, chcr & ~mask); + + if (chcr & RCAR_DMACHCR_DSE) + ret |= rcar_dmac_isr_desc_stage_end(chan); + + if (chcr & RCAR_DMACHCR_TE) + ret |= rcar_dmac_isr_transfer_end(chan); + + spin_unlock(&chan->lock); + + return ret; +} + +static irqreturn_t rcar_dmac_isr_channel_thread(int irq, void *dev) +{ + struct rcar_dmac_chan *chan = dev; + struct rcar_dmac_desc *desc; + + spin_lock_irq(&chan->lock); + + /* For cyclic transfers notify the user after every chunk. */ + if (chan->desc.running && chan->desc.running->cyclic) { + dma_async_tx_callback callback; + void *callback_param; + + desc = chan->desc.running; + callback = desc->async_tx.callback; + callback_param = desc->async_tx.callback_param; + + if (callback) { + spin_unlock_irq(&chan->lock); + callback(callback_param); + spin_lock_irq(&chan->lock); + } + } + + /* + * Call the callback function for all descriptors on the done list and + * move them to the ack wait list. + */ + while (!list_empty(&chan->desc.done)) { + desc = list_first_entry(&chan->desc.done, struct rcar_dmac_desc, + node); + dma_cookie_complete(&desc->async_tx); + list_del(&desc->node); + + if (desc->async_tx.callback) { + spin_unlock_irq(&chan->lock); + /* + * We own the only reference to this descriptor, we can + * safely dereference it without holding the channel + * lock. + */ + desc->async_tx.callback(desc->async_tx.callback_param); + spin_lock_irq(&chan->lock); + } + + list_add_tail(&desc->node, &chan->desc.wait); + } + + spin_unlock_irq(&chan->lock); + + /* Recycle all acked descriptors. */ + rcar_dmac_desc_recycle_acked(chan); + + return IRQ_HANDLED; +} + +static irqreturn_t rcar_dmac_isr_error(int irq, void *data) +{ + struct rcar_dmac *dmac = data; + + if (!(rcar_dmac_read(dmac, RCAR_DMAOR) & RCAR_DMAOR_AE)) + return IRQ_NONE; + + /* + * An unrecoverable error occurred on an unknown channel. Halt the DMAC, + * abort transfers on all channels, and reinitialize the DMAC. + */ + rcar_dmac_stop(dmac); + rcar_dmac_abort(dmac); + rcar_dmac_init(dmac); + + return IRQ_HANDLED; +} + +/* ----------------------------------------------------------------------------- + * OF xlate and channel filter + */ + +static bool rcar_dmac_chan_filter(struct dma_chan *chan, void *arg) +{ + struct rcar_dmac *dmac = to_rcar_dmac(chan->device); + struct of_phandle_args *dma_spec = arg; + + /* + * FIXME: Using a filter on OF platforms is a nonsense. The OF xlate + * function knows from which device it wants to allocate a channel from, + * and would be perfectly capable of selecting the channel it wants. + * Forcing it to call dma_request_channel() and iterate through all + * channels from all controllers is just pointless. + */ + if (chan->device->device_config != rcar_dmac_device_config || + dma_spec->np != chan->device->dev->of_node) + return false; + + return !test_and_set_bit(dma_spec->args[0], dmac->modules); +} + +static struct dma_chan *rcar_dmac_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct rcar_dmac_chan *rchan; + struct dma_chan *chan; + dma_cap_mask_t mask; + + if (dma_spec->args_count != 1) + return NULL; + + /* Only slave DMA channels can be allocated via DT */ + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + chan = dma_request_channel(mask, rcar_dmac_chan_filter, dma_spec); + if (!chan) + return NULL; + + rchan = to_rcar_dmac_chan(chan); + rchan->mid_rid = dma_spec->args[0]; + + return chan; +} + +/* ----------------------------------------------------------------------------- + * Power management + */ + +#ifdef CONFIG_PM_SLEEP +static int rcar_dmac_sleep_suspend(struct device *dev) +{ + /* + * TODO: Wait for the current transfer to complete and stop the device. + */ + return 0; +} + +static int rcar_dmac_sleep_resume(struct device *dev) +{ + /* TODO: Resume transfers, if any. */ + return 0; +} +#endif + +#ifdef CONFIG_PM +static int rcar_dmac_runtime_suspend(struct device *dev) +{ + return 0; +} + +static int rcar_dmac_runtime_resume(struct device *dev) +{ + struct rcar_dmac *dmac = dev_get_drvdata(dev); + + return rcar_dmac_init(dmac); +} +#endif + +static const struct dev_pm_ops rcar_dmac_pm = { + SET_SYSTEM_SLEEP_PM_OPS(rcar_dmac_sleep_suspend, rcar_dmac_sleep_resume) + SET_RUNTIME_PM_OPS(rcar_dmac_runtime_suspend, rcar_dmac_runtime_resume, + NULL) +}; + +/* ----------------------------------------------------------------------------- + * Probe and remove + */ + +static int rcar_dmac_chan_probe(struct rcar_dmac *dmac, + struct rcar_dmac_chan *rchan, + unsigned int index) +{ + struct platform_device *pdev = to_platform_device(dmac->dev); + struct dma_chan *chan = &rchan->chan; + char pdev_irqname[5]; + char *irqname; + int irq; + int ret; + + rchan->index = index; + rchan->iomem = dmac->iomem + RCAR_DMAC_CHAN_OFFSET(index); + rchan->mid_rid = -EINVAL; + + spin_lock_init(&rchan->lock); + + INIT_LIST_HEAD(&rchan->desc.free); + INIT_LIST_HEAD(&rchan->desc.pending); + INIT_LIST_HEAD(&rchan->desc.active); + INIT_LIST_HEAD(&rchan->desc.done); + INIT_LIST_HEAD(&rchan->desc.wait); + + /* Request the channel interrupt. */ + sprintf(pdev_irqname, "ch%u", index); + irq = platform_get_irq_byname(pdev, pdev_irqname); + if (irq < 0) { + dev_err(dmac->dev, "no IRQ specified for channel %u\n", index); + return -ENODEV; + } + + irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:%u", + dev_name(dmac->dev), index); + if (!irqname) + return -ENOMEM; + + ret = devm_request_threaded_irq(dmac->dev, irq, rcar_dmac_isr_channel, + rcar_dmac_isr_channel_thread, 0, + irqname, rchan); + if (ret) { + dev_err(dmac->dev, "failed to request IRQ %u (%d)\n", irq, ret); + return ret; + } + + /* + * Initialize the DMA engine channel and add it to the DMA engine + * channels list. + */ + chan->device = &dmac->engine; + dma_cookie_init(chan); + + list_add_tail(&chan->device_node, &dmac->engine.channels); + + return 0; +} + +static int rcar_dmac_parse_of(struct device *dev, struct rcar_dmac *dmac) +{ + struct device_node *np = dev->of_node; + int ret; + + ret = of_property_read_u32(np, "dma-channels", &dmac->n_channels); + if (ret < 0) { + dev_err(dev, "unable to read dma-channels property\n"); + return ret; + } + + if (dmac->n_channels <= 0 || dmac->n_channels >= 100) { + dev_err(dev, "invalid number of channels %u\n", + dmac->n_channels); + return -EINVAL; + } + + return 0; +} + +static int rcar_dmac_probe(struct platform_device *pdev) +{ + const enum dma_slave_buswidth widths = DMA_SLAVE_BUSWIDTH_1_BYTE | + DMA_SLAVE_BUSWIDTH_2_BYTES | DMA_SLAVE_BUSWIDTH_4_BYTES | + DMA_SLAVE_BUSWIDTH_8_BYTES | DMA_SLAVE_BUSWIDTH_16_BYTES | + DMA_SLAVE_BUSWIDTH_32_BYTES | DMA_SLAVE_BUSWIDTH_64_BYTES; + unsigned int channels_offset = 0; + struct dma_device *engine; + struct rcar_dmac *dmac; + struct resource *mem; + unsigned int i; + char *irqname; + int irq; + int ret; + + dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL); + if (!dmac) + return -ENOMEM; + + dmac->dev = &pdev->dev; + platform_set_drvdata(pdev, dmac); + + ret = rcar_dmac_parse_of(&pdev->dev, dmac); + if (ret < 0) + return ret; + + /* + * A still unconfirmed hardware bug prevents the IPMMU microTLB 0 to be + * flushed correctly, resulting in memory corruption. DMAC 0 channel 0 + * is connected to microTLB 0 on currently supported platforms, so we + * can't use it with the IPMMU. As the IOMMU API operates at the device + * level we can't disable it selectively, so ignore channel 0 for now if + * the device is part of an IOMMU group. + */ + if (pdev->dev.iommu_group) { + dmac->n_channels--; + channels_offset = 1; + } + + dmac->channels = devm_kcalloc(&pdev->dev, dmac->n_channels, + sizeof(*dmac->channels), GFP_KERNEL); + if (!dmac->channels) + return -ENOMEM; + + /* Request resources. */ + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dmac->iomem = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(dmac->iomem)) + return PTR_ERR(dmac->iomem); + + irq = platform_get_irq_byname(pdev, "error"); + if (irq < 0) { + dev_err(&pdev->dev, "no error IRQ specified\n"); + return -ENODEV; + } + + irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:error", + dev_name(dmac->dev)); + if (!irqname) + return -ENOMEM; + + ret = devm_request_irq(&pdev->dev, irq, rcar_dmac_isr_error, 0, + irqname, dmac); + if (ret) { + dev_err(&pdev->dev, "failed to request IRQ %u (%d)\n", + irq, ret); + return ret; + } + + /* Enable runtime PM and initialize the device. */ + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "runtime PM get sync failed (%d)\n", ret); + return ret; + } + + ret = rcar_dmac_init(dmac); + pm_runtime_put(&pdev->dev); + + if (ret) { + dev_err(&pdev->dev, "failed to reset device\n"); + goto error; + } + + /* Initialize the channels. */ + INIT_LIST_HEAD(&dmac->engine.channels); + + for (i = 0; i < dmac->n_channels; ++i) { + ret = rcar_dmac_chan_probe(dmac, &dmac->channels[i], + i + channels_offset); + if (ret < 0) + goto error; + } + + /* Register the DMAC as a DMA provider for DT. */ + ret = of_dma_controller_register(pdev->dev.of_node, rcar_dmac_of_xlate, + NULL); + if (ret < 0) + goto error; + + /* + * Register the DMA engine device. + * + * Default transfer size of 32 bytes requires 32-byte alignment. + */ + engine = &dmac->engine; + dma_cap_set(DMA_MEMCPY, engine->cap_mask); + dma_cap_set(DMA_SLAVE, engine->cap_mask); + + engine->dev = &pdev->dev; + engine->copy_align = ilog2(RCAR_DMAC_MEMCPY_XFER_SIZE); + + engine->src_addr_widths = widths; + engine->dst_addr_widths = widths; + engine->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); + engine->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + engine->device_alloc_chan_resources = rcar_dmac_alloc_chan_resources; + engine->device_free_chan_resources = rcar_dmac_free_chan_resources; + engine->device_prep_dma_memcpy = rcar_dmac_prep_dma_memcpy; + engine->device_prep_slave_sg = rcar_dmac_prep_slave_sg; + engine->device_prep_dma_cyclic = rcar_dmac_prep_dma_cyclic; + engine->device_config = rcar_dmac_device_config; + engine->device_terminate_all = rcar_dmac_chan_terminate_all; + engine->device_tx_status = rcar_dmac_tx_status; + engine->device_issue_pending = rcar_dmac_issue_pending; + + ret = dma_async_device_register(engine); + if (ret < 0) + goto error; + + return 0; + +error: + of_dma_controller_free(pdev->dev.of_node); + pm_runtime_disable(&pdev->dev); + return ret; +} + +static int rcar_dmac_remove(struct platform_device *pdev) +{ + struct rcar_dmac *dmac = platform_get_drvdata(pdev); + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&dmac->engine); + + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static void rcar_dmac_shutdown(struct platform_device *pdev) +{ + struct rcar_dmac *dmac = platform_get_drvdata(pdev); + + rcar_dmac_stop(dmac); +} + +static const struct of_device_id rcar_dmac_of_ids[] = { + { .compatible = "renesas,rcar-dmac", }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, rcar_dmac_of_ids); + +static struct platform_driver rcar_dmac_driver = { + .driver = { + .pm = &rcar_dmac_pm, + .name = "rcar-dmac", + .of_match_table = rcar_dmac_of_ids, + }, + .probe = rcar_dmac_probe, + .remove = rcar_dmac_remove, + .shutdown = rcar_dmac_shutdown, +}; + +module_platform_driver(rcar_dmac_driver); + +MODULE_DESCRIPTION("R-Car Gen2 DMA Controller Driver"); +MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/sh/rcar-hpbdma.c b/drivers/dma/sh/rcar-hpbdma.c new file mode 100644 index 000000000..749f26ecd --- /dev/null +++ b/drivers/dma/sh/rcar-hpbdma.c @@ -0,0 +1,669 @@ +/* + * Copyright (C) 2011-2013 Renesas Electronics Corporation + * Copyright (C) 2013 Cogent Embedded, Inc. + * + * This file is based on the drivers/dma/sh/shdma.c + * + * Renesas SuperH DMA Engine support + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * - DMA of SuperH does not have Hardware DMA chain mode. + * - max DMA size is 16MB. + * + */ + +#include <linux/dmaengine.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_data/dma-rcar-hpbdma.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/shdma-base.h> +#include <linux/slab.h> + +/* DMA channel registers */ +#define HPB_DMAE_DSAR0 0x00 +#define HPB_DMAE_DDAR0 0x04 +#define HPB_DMAE_DTCR0 0x08 +#define HPB_DMAE_DSAR1 0x0C +#define HPB_DMAE_DDAR1 0x10 +#define HPB_DMAE_DTCR1 0x14 +#define HPB_DMAE_DSASR 0x18 +#define HPB_DMAE_DDASR 0x1C +#define HPB_DMAE_DTCSR 0x20 +#define HPB_DMAE_DPTR 0x24 +#define HPB_DMAE_DCR 0x28 +#define HPB_DMAE_DCMDR 0x2C +#define HPB_DMAE_DSTPR 0x30 +#define HPB_DMAE_DSTSR 0x34 +#define HPB_DMAE_DDBGR 0x38 +#define HPB_DMAE_DDBGR2 0x3C +#define HPB_DMAE_CHAN(n) (0x40 * (n)) + +/* DMA command register (DCMDR) bits */ +#define HPB_DMAE_DCMDR_BDOUT BIT(7) +#define HPB_DMAE_DCMDR_DQSPD BIT(6) +#define HPB_DMAE_DCMDR_DQSPC BIT(5) +#define HPB_DMAE_DCMDR_DMSPD BIT(4) +#define HPB_DMAE_DCMDR_DMSPC BIT(3) +#define HPB_DMAE_DCMDR_DQEND BIT(2) +#define HPB_DMAE_DCMDR_DNXT BIT(1) +#define HPB_DMAE_DCMDR_DMEN BIT(0) + +/* DMA forced stop register (DSTPR) bits */ +#define HPB_DMAE_DSTPR_DMSTP BIT(0) + +/* DMA status register (DSTSR) bits */ +#define HPB_DMAE_DSTSR_DQSTS BIT(2) +#define HPB_DMAE_DSTSR_DMSTS BIT(0) + +/* DMA common registers */ +#define HPB_DMAE_DTIMR 0x00 +#define HPB_DMAE_DINTSR0 0x0C +#define HPB_DMAE_DINTSR1 0x10 +#define HPB_DMAE_DINTCR0 0x14 +#define HPB_DMAE_DINTCR1 0x18 +#define HPB_DMAE_DINTMR0 0x1C +#define HPB_DMAE_DINTMR1 0x20 +#define HPB_DMAE_DACTSR0 0x24 +#define HPB_DMAE_DACTSR1 0x28 +#define HPB_DMAE_HSRSTR(n) (0x40 + (n) * 4) +#define HPB_DMAE_HPB_DMASPR(n) (0x140 + (n) * 4) +#define HPB_DMAE_HPB_DMLVLR0 0x160 +#define HPB_DMAE_HPB_DMLVLR1 0x164 +#define HPB_DMAE_HPB_DMSHPT0 0x168 +#define HPB_DMAE_HPB_DMSHPT1 0x16C + +#define HPB_DMA_SLAVE_NUMBER 256 +#define HPB_DMA_TCR_MAX 0x01000000 /* 16 MiB */ + +struct hpb_dmae_chan { + struct shdma_chan shdma_chan; + int xfer_mode; /* DMA transfer mode */ +#define XFER_SINGLE 1 +#define XFER_DOUBLE 2 + unsigned plane_idx; /* current DMA information set */ + bool first_desc; /* first/next transfer */ + int xmit_shift; /* log_2(bytes_per_xfer) */ + void __iomem *base; + const struct hpb_dmae_slave_config *cfg; + char dev_id[16]; /* unique name per DMAC of channel */ + dma_addr_t slave_addr; +}; + +struct hpb_dmae_device { + struct shdma_dev shdma_dev; + spinlock_t reg_lock; /* comm_reg operation lock */ + struct hpb_dmae_pdata *pdata; + void __iomem *chan_reg; + void __iomem *comm_reg; + void __iomem *reset_reg; + void __iomem *mode_reg; +}; + +struct hpb_dmae_regs { + u32 sar; /* SAR / source address */ + u32 dar; /* DAR / destination address */ + u32 tcr; /* TCR / transfer count */ +}; + +struct hpb_desc { + struct shdma_desc shdma_desc; + struct hpb_dmae_regs hw; + unsigned plane_idx; +}; + +#define to_chan(schan) container_of(schan, struct hpb_dmae_chan, shdma_chan) +#define to_desc(sdesc) container_of(sdesc, struct hpb_desc, shdma_desc) +#define to_dev(sc) container_of(sc->shdma_chan.dma_chan.device, \ + struct hpb_dmae_device, shdma_dev.dma_dev) + +static void ch_reg_write(struct hpb_dmae_chan *hpb_dc, u32 data, u32 reg) +{ + iowrite32(data, hpb_dc->base + reg); +} + +static u32 ch_reg_read(struct hpb_dmae_chan *hpb_dc, u32 reg) +{ + return ioread32(hpb_dc->base + reg); +} + +static void dcmdr_write(struct hpb_dmae_device *hpbdev, u32 data) +{ + iowrite32(data, hpbdev->chan_reg + HPB_DMAE_DCMDR); +} + +static void hsrstr_write(struct hpb_dmae_device *hpbdev, u32 ch) +{ + iowrite32(0x1, hpbdev->comm_reg + HPB_DMAE_HSRSTR(ch)); +} + +static u32 dintsr_read(struct hpb_dmae_device *hpbdev, u32 ch) +{ + u32 v; + + if (ch < 32) + v = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTSR0) >> ch; + else + v = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTSR1) >> (ch - 32); + return v & 0x1; +} + +static void dintcr_write(struct hpb_dmae_device *hpbdev, u32 ch) +{ + if (ch < 32) + iowrite32((0x1 << ch), hpbdev->comm_reg + HPB_DMAE_DINTCR0); + else + iowrite32((0x1 << (ch - 32)), + hpbdev->comm_reg + HPB_DMAE_DINTCR1); +} + +static void asyncmdr_write(struct hpb_dmae_device *hpbdev, u32 data) +{ + iowrite32(data, hpbdev->mode_reg); +} + +static u32 asyncmdr_read(struct hpb_dmae_device *hpbdev) +{ + return ioread32(hpbdev->mode_reg); +} + +static void hpb_dmae_enable_int(struct hpb_dmae_device *hpbdev, u32 ch) +{ + u32 intreg; + + spin_lock_irq(&hpbdev->reg_lock); + if (ch < 32) { + intreg = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTMR0); + iowrite32(BIT(ch) | intreg, + hpbdev->comm_reg + HPB_DMAE_DINTMR0); + } else { + intreg = ioread32(hpbdev->comm_reg + HPB_DMAE_DINTMR1); + iowrite32(BIT(ch - 32) | intreg, + hpbdev->comm_reg + HPB_DMAE_DINTMR1); + } + spin_unlock_irq(&hpbdev->reg_lock); +} + +static void hpb_dmae_async_reset(struct hpb_dmae_device *hpbdev, u32 data) +{ + u32 rstr; + int timeout = 10000; /* 100 ms */ + + spin_lock(&hpbdev->reg_lock); + rstr = ioread32(hpbdev->reset_reg); + rstr |= data; + iowrite32(rstr, hpbdev->reset_reg); + do { + rstr = ioread32(hpbdev->reset_reg); + if ((rstr & data) == data) + break; + udelay(10); + } while (timeout--); + + if (timeout < 0) + dev_err(hpbdev->shdma_dev.dma_dev.dev, + "%s timeout\n", __func__); + + rstr &= ~data; + iowrite32(rstr, hpbdev->reset_reg); + spin_unlock(&hpbdev->reg_lock); +} + +static void hpb_dmae_set_async_mode(struct hpb_dmae_device *hpbdev, + u32 mask, u32 data) +{ + u32 mode; + + spin_lock_irq(&hpbdev->reg_lock); + mode = asyncmdr_read(hpbdev); + mode &= ~mask; + mode |= data; + asyncmdr_write(hpbdev, mode); + spin_unlock_irq(&hpbdev->reg_lock); +} + +static void hpb_dmae_ctl_stop(struct hpb_dmae_device *hpbdev) +{ + dcmdr_write(hpbdev, HPB_DMAE_DCMDR_DQSPD); +} + +static void hpb_dmae_reset(struct hpb_dmae_device *hpbdev) +{ + u32 ch; + + for (ch = 0; ch < hpbdev->pdata->num_hw_channels; ch++) + hsrstr_write(hpbdev, ch); +} + +static unsigned int calc_xmit_shift(struct hpb_dmae_chan *hpb_chan) +{ + struct hpb_dmae_device *hpbdev = to_dev(hpb_chan); + struct hpb_dmae_pdata *pdata = hpbdev->pdata; + int width = ch_reg_read(hpb_chan, HPB_DMAE_DCR); + int i; + + switch (width & (HPB_DMAE_DCR_SPDS_MASK | HPB_DMAE_DCR_DPDS_MASK)) { + case HPB_DMAE_DCR_SPDS_8BIT | HPB_DMAE_DCR_DPDS_8BIT: + default: + i = XMIT_SZ_8BIT; + break; + case HPB_DMAE_DCR_SPDS_16BIT | HPB_DMAE_DCR_DPDS_16BIT: + i = XMIT_SZ_16BIT; + break; + case HPB_DMAE_DCR_SPDS_32BIT | HPB_DMAE_DCR_DPDS_32BIT: + i = XMIT_SZ_32BIT; + break; + } + return pdata->ts_shift[i]; +} + +static void hpb_dmae_set_reg(struct hpb_dmae_chan *hpb_chan, + struct hpb_dmae_regs *hw, unsigned plane) +{ + ch_reg_write(hpb_chan, hw->sar, + plane ? HPB_DMAE_DSAR1 : HPB_DMAE_DSAR0); + ch_reg_write(hpb_chan, hw->dar, + plane ? HPB_DMAE_DDAR1 : HPB_DMAE_DDAR0); + ch_reg_write(hpb_chan, hw->tcr >> hpb_chan->xmit_shift, + plane ? HPB_DMAE_DTCR1 : HPB_DMAE_DTCR0); +} + +static void hpb_dmae_start(struct hpb_dmae_chan *hpb_chan, bool next) +{ + ch_reg_write(hpb_chan, (next ? HPB_DMAE_DCMDR_DNXT : 0) | + HPB_DMAE_DCMDR_DMEN, HPB_DMAE_DCMDR); +} + +static void hpb_dmae_halt(struct shdma_chan *schan) +{ + struct hpb_dmae_chan *chan = to_chan(schan); + + ch_reg_write(chan, HPB_DMAE_DCMDR_DQEND, HPB_DMAE_DCMDR); + ch_reg_write(chan, HPB_DMAE_DSTPR_DMSTP, HPB_DMAE_DSTPR); + + chan->plane_idx = 0; + chan->first_desc = true; +} + +static const struct hpb_dmae_slave_config * +hpb_dmae_find_slave(struct hpb_dmae_chan *hpb_chan, int slave_id) +{ + struct hpb_dmae_device *hpbdev = to_dev(hpb_chan); + struct hpb_dmae_pdata *pdata = hpbdev->pdata; + int i; + + if (slave_id >= HPB_DMA_SLAVE_NUMBER) + return NULL; + + for (i = 0; i < pdata->num_slaves; i++) + if (pdata->slaves[i].id == slave_id) + return pdata->slaves + i; + + return NULL; +} + +static void hpb_dmae_start_xfer(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct hpb_dmae_chan *chan = to_chan(schan); + struct hpb_dmae_device *hpbdev = to_dev(chan); + struct hpb_desc *desc = to_desc(sdesc); + + if (chan->cfg->flags & HPB_DMAE_SET_ASYNC_RESET) + hpb_dmae_async_reset(hpbdev, chan->cfg->rstr); + + desc->plane_idx = chan->plane_idx; + hpb_dmae_set_reg(chan, &desc->hw, chan->plane_idx); + hpb_dmae_start(chan, !chan->first_desc); + + if (chan->xfer_mode == XFER_DOUBLE) { + chan->plane_idx ^= 1; + chan->first_desc = false; + } +} + +static bool hpb_dmae_desc_completed(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + /* + * This is correct since we always have at most single + * outstanding DMA transfer per channel, and by the time + * we get completion interrupt the transfer is completed. + * This will change if we ever use alternating DMA + * information sets and submit two descriptors at once. + */ + return true; +} + +static bool hpb_dmae_chan_irq(struct shdma_chan *schan, int irq) +{ + struct hpb_dmae_chan *chan = to_chan(schan); + struct hpb_dmae_device *hpbdev = to_dev(chan); + int ch = chan->cfg->dma_ch; + + /* Check Complete DMA Transfer */ + if (dintsr_read(hpbdev, ch)) { + /* Clear Interrupt status */ + dintcr_write(hpbdev, ch); + return true; + } + return false; +} + +static int hpb_dmae_desc_setup(struct shdma_chan *schan, + struct shdma_desc *sdesc, + dma_addr_t src, dma_addr_t dst, size_t *len) +{ + struct hpb_desc *desc = to_desc(sdesc); + + if (*len > (size_t)HPB_DMA_TCR_MAX) + *len = (size_t)HPB_DMA_TCR_MAX; + + desc->hw.sar = src; + desc->hw.dar = dst; + desc->hw.tcr = *len; + + return 0; +} + +static size_t hpb_dmae_get_partial(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct hpb_desc *desc = to_desc(sdesc); + struct hpb_dmae_chan *chan = to_chan(schan); + u32 tcr = ch_reg_read(chan, desc->plane_idx ? + HPB_DMAE_DTCR1 : HPB_DMAE_DTCR0); + + return (desc->hw.tcr - tcr) << chan->xmit_shift; +} + +static bool hpb_dmae_channel_busy(struct shdma_chan *schan) +{ + struct hpb_dmae_chan *chan = to_chan(schan); + u32 dstsr = ch_reg_read(chan, HPB_DMAE_DSTSR); + + if (chan->xfer_mode == XFER_DOUBLE) + return dstsr & HPB_DMAE_DSTSR_DQSTS; + else + return dstsr & HPB_DMAE_DSTSR_DMSTS; +} + +static int +hpb_dmae_alloc_chan_resources(struct hpb_dmae_chan *hpb_chan, + const struct hpb_dmae_slave_config *cfg) +{ + struct hpb_dmae_device *hpbdev = to_dev(hpb_chan); + struct hpb_dmae_pdata *pdata = hpbdev->pdata; + const struct hpb_dmae_channel *channel = pdata->channels; + int slave_id = cfg->id; + int i, err; + + for (i = 0; i < pdata->num_channels; i++, channel++) { + if (channel->s_id == slave_id) { + struct device *dev = hpb_chan->shdma_chan.dev; + + hpb_chan->base = hpbdev->chan_reg + + HPB_DMAE_CHAN(cfg->dma_ch); + + dev_dbg(dev, "Detected Slave device\n"); + dev_dbg(dev, " -- slave_id : 0x%x\n", slave_id); + dev_dbg(dev, " -- cfg->dma_ch : %d\n", cfg->dma_ch); + dev_dbg(dev, " -- channel->ch_irq: %d\n", + channel->ch_irq); + break; + } + } + + err = shdma_request_irq(&hpb_chan->shdma_chan, channel->ch_irq, + IRQF_SHARED, hpb_chan->dev_id); + if (err) { + dev_err(hpb_chan->shdma_chan.dev, + "DMA channel request_irq %d failed with error %d\n", + channel->ch_irq, err); + return err; + } + + hpb_chan->plane_idx = 0; + hpb_chan->first_desc = true; + + if ((cfg->dcr & (HPB_DMAE_DCR_CT | HPB_DMAE_DCR_DIP)) == 0) { + hpb_chan->xfer_mode = XFER_SINGLE; + } else if ((cfg->dcr & (HPB_DMAE_DCR_CT | HPB_DMAE_DCR_DIP)) == + (HPB_DMAE_DCR_CT | HPB_DMAE_DCR_DIP)) { + hpb_chan->xfer_mode = XFER_DOUBLE; + } else { + dev_err(hpb_chan->shdma_chan.dev, "DCR setting error"); + return -EINVAL; + } + + if (cfg->flags & HPB_DMAE_SET_ASYNC_MODE) + hpb_dmae_set_async_mode(hpbdev, cfg->mdm, cfg->mdr); + ch_reg_write(hpb_chan, cfg->dcr, HPB_DMAE_DCR); + ch_reg_write(hpb_chan, cfg->port, HPB_DMAE_DPTR); + hpb_chan->xmit_shift = calc_xmit_shift(hpb_chan); + hpb_dmae_enable_int(hpbdev, cfg->dma_ch); + + return 0; +} + +static int hpb_dmae_set_slave(struct shdma_chan *schan, int slave_id, + dma_addr_t slave_addr, bool try) +{ + struct hpb_dmae_chan *chan = to_chan(schan); + const struct hpb_dmae_slave_config *sc = + hpb_dmae_find_slave(chan, slave_id); + + if (!sc) + return -ENODEV; + if (try) + return 0; + chan->cfg = sc; + chan->slave_addr = slave_addr ? : sc->addr; + return hpb_dmae_alloc_chan_resources(chan, sc); +} + +static void hpb_dmae_setup_xfer(struct shdma_chan *schan, int slave_id) +{ +} + +static dma_addr_t hpb_dmae_slave_addr(struct shdma_chan *schan) +{ + struct hpb_dmae_chan *chan = to_chan(schan); + + return chan->slave_addr; +} + +static struct shdma_desc *hpb_dmae_embedded_desc(void *buf, int i) +{ + return &((struct hpb_desc *)buf)[i].shdma_desc; +} + +static const struct shdma_ops hpb_dmae_ops = { + .desc_completed = hpb_dmae_desc_completed, + .halt_channel = hpb_dmae_halt, + .channel_busy = hpb_dmae_channel_busy, + .slave_addr = hpb_dmae_slave_addr, + .desc_setup = hpb_dmae_desc_setup, + .set_slave = hpb_dmae_set_slave, + .setup_xfer = hpb_dmae_setup_xfer, + .start_xfer = hpb_dmae_start_xfer, + .embedded_desc = hpb_dmae_embedded_desc, + .chan_irq = hpb_dmae_chan_irq, + .get_partial = hpb_dmae_get_partial, +}; + +static int hpb_dmae_chan_probe(struct hpb_dmae_device *hpbdev, int id) +{ + struct shdma_dev *sdev = &hpbdev->shdma_dev; + struct platform_device *pdev = + to_platform_device(hpbdev->shdma_dev.dma_dev.dev); + struct hpb_dmae_chan *new_hpb_chan; + struct shdma_chan *schan; + + /* Alloc channel */ + new_hpb_chan = devm_kzalloc(&pdev->dev, + sizeof(struct hpb_dmae_chan), GFP_KERNEL); + if (!new_hpb_chan) { + dev_err(hpbdev->shdma_dev.dma_dev.dev, + "No free memory for allocating DMA channels!\n"); + return -ENOMEM; + } + + schan = &new_hpb_chan->shdma_chan; + schan->max_xfer_len = HPB_DMA_TCR_MAX; + + shdma_chan_probe(sdev, schan, id); + + if (pdev->id >= 0) + snprintf(new_hpb_chan->dev_id, sizeof(new_hpb_chan->dev_id), + "hpb-dmae%d.%d", pdev->id, id); + else + snprintf(new_hpb_chan->dev_id, sizeof(new_hpb_chan->dev_id), + "hpb-dma.%d", id); + + return 0; +} + +static int hpb_dmae_probe(struct platform_device *pdev) +{ + const enum dma_slave_buswidth widths = DMA_SLAVE_BUSWIDTH_1_BYTE | + DMA_SLAVE_BUSWIDTH_2_BYTES | DMA_SLAVE_BUSWIDTH_4_BYTES; + struct hpb_dmae_pdata *pdata = pdev->dev.platform_data; + struct hpb_dmae_device *hpbdev; + struct dma_device *dma_dev; + struct resource *chan, *comm, *rest, *mode, *irq_res; + int err, i; + + /* Get platform data */ + if (!pdata || !pdata->num_channels) + return -ENODEV; + + chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); + comm = platform_get_resource(pdev, IORESOURCE_MEM, 1); + rest = platform_get_resource(pdev, IORESOURCE_MEM, 2); + mode = platform_get_resource(pdev, IORESOURCE_MEM, 3); + + irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!irq_res) + return -ENODEV; + + hpbdev = devm_kzalloc(&pdev->dev, sizeof(struct hpb_dmae_device), + GFP_KERNEL); + if (!hpbdev) { + dev_err(&pdev->dev, "Not enough memory\n"); + return -ENOMEM; + } + + hpbdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); + if (IS_ERR(hpbdev->chan_reg)) + return PTR_ERR(hpbdev->chan_reg); + + hpbdev->comm_reg = devm_ioremap_resource(&pdev->dev, comm); + if (IS_ERR(hpbdev->comm_reg)) + return PTR_ERR(hpbdev->comm_reg); + + hpbdev->reset_reg = devm_ioremap_resource(&pdev->dev, rest); + if (IS_ERR(hpbdev->reset_reg)) + return PTR_ERR(hpbdev->reset_reg); + + hpbdev->mode_reg = devm_ioremap_resource(&pdev->dev, mode); + if (IS_ERR(hpbdev->mode_reg)) + return PTR_ERR(hpbdev->mode_reg); + + dma_dev = &hpbdev->shdma_dev.dma_dev; + + spin_lock_init(&hpbdev->reg_lock); + + /* Platform data */ + hpbdev->pdata = pdata; + + pm_runtime_enable(&pdev->dev); + err = pm_runtime_get_sync(&pdev->dev); + if (err < 0) + dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err); + + /* Reset DMA controller */ + hpb_dmae_reset(hpbdev); + + pm_runtime_put(&pdev->dev); + + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + dma_dev->src_addr_widths = widths; + dma_dev->dst_addr_widths = widths; + dma_dev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); + dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; + + hpbdev->shdma_dev.ops = &hpb_dmae_ops; + hpbdev->shdma_dev.desc_size = sizeof(struct hpb_desc); + err = shdma_init(&pdev->dev, &hpbdev->shdma_dev, pdata->num_channels); + if (err < 0) + goto error; + + /* Create DMA channels */ + for (i = 0; i < pdata->num_channels; i++) + hpb_dmae_chan_probe(hpbdev, i); + + platform_set_drvdata(pdev, hpbdev); + err = dma_async_device_register(dma_dev); + if (!err) + return 0; + + shdma_cleanup(&hpbdev->shdma_dev); +error: + pm_runtime_disable(&pdev->dev); + return err; +} + +static void hpb_dmae_chan_remove(struct hpb_dmae_device *hpbdev) +{ + struct shdma_chan *schan; + int i; + + shdma_for_each_chan(schan, &hpbdev->shdma_dev, i) { + BUG_ON(!schan); + + shdma_chan_remove(schan); + } +} + +static int hpb_dmae_remove(struct platform_device *pdev) +{ + struct hpb_dmae_device *hpbdev = platform_get_drvdata(pdev); + + dma_async_device_unregister(&hpbdev->shdma_dev.dma_dev); + + pm_runtime_disable(&pdev->dev); + + hpb_dmae_chan_remove(hpbdev); + + return 0; +} + +static void hpb_dmae_shutdown(struct platform_device *pdev) +{ + struct hpb_dmae_device *hpbdev = platform_get_drvdata(pdev); + hpb_dmae_ctl_stop(hpbdev); +} + +static struct platform_driver hpb_dmae_driver = { + .probe = hpb_dmae_probe, + .remove = hpb_dmae_remove, + .shutdown = hpb_dmae_shutdown, + .driver = { + .name = "hpb-dma-engine", + }, +}; +module_platform_driver(hpb_dmae_driver); + +MODULE_AUTHOR("Max Filippov <max.filippov@cogentembedded.com>"); +MODULE_DESCRIPTION("Renesas HPB DMA Engine driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/sh/shdma-arm.h b/drivers/dma/sh/shdma-arm.h new file mode 100644 index 000000000..a1b0ef45d --- /dev/null +++ b/drivers/dma/sh/shdma-arm.h @@ -0,0 +1,51 @@ +/* + * Renesas SuperH DMA Engine support + * + * Copyright (C) 2013 Renesas Electronics, Inc. + * + * This is free software; you can redistribute it and/or modify it under the + * terms of version 2 the GNU General Public License as published by the Free + * Software Foundation. + */ + +#ifndef SHDMA_ARM_H +#define SHDMA_ARM_H + +#include "shdma.h" + +/* Transmit sizes and respective CHCR register values */ +enum { + XMIT_SZ_8BIT = 0, + XMIT_SZ_16BIT = 1, + XMIT_SZ_32BIT = 2, + XMIT_SZ_64BIT = 7, + XMIT_SZ_128BIT = 3, + XMIT_SZ_256BIT = 4, + XMIT_SZ_512BIT = 5, +}; + +/* log2(size / 8) - used to calculate number of transfers */ +#define SH_DMAE_TS_SHIFT { \ + [XMIT_SZ_8BIT] = 0, \ + [XMIT_SZ_16BIT] = 1, \ + [XMIT_SZ_32BIT] = 2, \ + [XMIT_SZ_64BIT] = 3, \ + [XMIT_SZ_128BIT] = 4, \ + [XMIT_SZ_256BIT] = 5, \ + [XMIT_SZ_512BIT] = 6, \ +} + +#define TS_LOW_BIT 0x3 /* --xx */ +#define TS_HI_BIT 0xc /* xx-- */ + +#define TS_LOW_SHIFT (3) +#define TS_HI_SHIFT (20 - 2) /* 2 bits for shifted low TS */ + +#define TS_INDEX2VAL(i) \ + ((((i) & TS_LOW_BIT) << TS_LOW_SHIFT) |\ + (((i) & TS_HI_BIT) << TS_HI_SHIFT)) + +#define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | RS_ERS | TS_INDEX2VAL((xmit_sz))) +#define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | RS_ERS | TS_INDEX2VAL((xmit_sz))) + +#endif diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c new file mode 100644 index 000000000..10fcabad8 --- /dev/null +++ b/drivers/dma/sh/shdma-base.c @@ -0,0 +1,1064 @@ +/* + * Dmaengine driver base library for DMA controllers, found on SH-based SoCs + * + * extracted from shdma.c + * + * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/delay.h> +#include <linux/shdma-base.h> +#include <linux/dmaengine.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "../dmaengine.h" + +/* DMA descriptor control */ +enum shdma_desc_status { + DESC_IDLE, + DESC_PREPARED, + DESC_SUBMITTED, + DESC_COMPLETED, /* completed, have to call callback */ + DESC_WAITING, /* callback called, waiting for ack / re-submit */ +}; + +#define NR_DESCS_PER_CHANNEL 32 + +#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan) +#define to_shdma_dev(d) container_of(d, struct shdma_dev, dma_dev) + +/* + * For slave DMA we assume, that there is a finite number of DMA slaves in the + * system, and that each such slave can only use a finite number of channels. + * We use slave channel IDs to make sure, that no such slave channel ID is + * allocated more than once. + */ +static unsigned int slave_num = 256; +module_param(slave_num, uint, 0444); + +/* A bitmask with slave_num bits */ +static unsigned long *shdma_slave_used; + +/* Called under spin_lock_irq(&schan->chan_lock") */ +static void shdma_chan_xfer_ld_queue(struct shdma_chan *schan) +{ + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + struct shdma_desc *sdesc; + + /* DMA work check */ + if (ops->channel_busy(schan)) + return; + + /* Find the first not transferred descriptor */ + list_for_each_entry(sdesc, &schan->ld_queue, node) + if (sdesc->mark == DESC_SUBMITTED) { + ops->start_xfer(schan, sdesc); + break; + } +} + +static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct shdma_desc *chunk, *c, *desc = + container_of(tx, struct shdma_desc, async_tx); + struct shdma_chan *schan = to_shdma_chan(tx->chan); + dma_async_tx_callback callback = tx->callback; + dma_cookie_t cookie; + bool power_up; + + spin_lock_irq(&schan->chan_lock); + + power_up = list_empty(&schan->ld_queue); + + cookie = dma_cookie_assign(tx); + + /* Mark all chunks of this descriptor as submitted, move to the queue */ + list_for_each_entry_safe(chunk, c, desc->node.prev, node) { + /* + * All chunks are on the global ld_free, so, we have to find + * the end of the chain ourselves + */ + if (chunk != desc && (chunk->mark == DESC_IDLE || + chunk->async_tx.cookie > 0 || + chunk->async_tx.cookie == -EBUSY || + &chunk->node == &schan->ld_free)) + break; + chunk->mark = DESC_SUBMITTED; + if (chunk->chunks == 1) { + chunk->async_tx.callback = callback; + chunk->async_tx.callback_param = tx->callback_param; + } else { + /* Callback goes to the last chunk */ + chunk->async_tx.callback = NULL; + } + chunk->cookie = cookie; + list_move_tail(&chunk->node, &schan->ld_queue); + + dev_dbg(schan->dev, "submit #%d@%p on %d\n", + tx->cookie, &chunk->async_tx, schan->id); + } + + if (power_up) { + int ret; + schan->pm_state = SHDMA_PM_BUSY; + + ret = pm_runtime_get(schan->dev); + + spin_unlock_irq(&schan->chan_lock); + if (ret < 0) + dev_err(schan->dev, "%s(): GET = %d\n", __func__, ret); + + pm_runtime_barrier(schan->dev); + + spin_lock_irq(&schan->chan_lock); + + /* Have we been reset, while waiting? */ + if (schan->pm_state != SHDMA_PM_ESTABLISHED) { + struct shdma_dev *sdev = + to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + dev_dbg(schan->dev, "Bring up channel %d\n", + schan->id); + /* + * TODO: .xfer_setup() might fail on some platforms. + * Make it int then, on error remove chunks from the + * queue again + */ + ops->setup_xfer(schan, schan->slave_id); + + if (schan->pm_state == SHDMA_PM_PENDING) + shdma_chan_xfer_ld_queue(schan); + schan->pm_state = SHDMA_PM_ESTABLISHED; + } + } else { + /* + * Tell .device_issue_pending() not to run the queue, interrupts + * will do it anyway + */ + schan->pm_state = SHDMA_PM_PENDING; + } + + spin_unlock_irq(&schan->chan_lock); + + return cookie; +} + +/* Called with desc_lock held */ +static struct shdma_desc *shdma_get_desc(struct shdma_chan *schan) +{ + struct shdma_desc *sdesc; + + list_for_each_entry(sdesc, &schan->ld_free, node) + if (sdesc->mark != DESC_PREPARED) { + BUG_ON(sdesc->mark != DESC_IDLE); + list_del(&sdesc->node); + return sdesc; + } + + return NULL; +} + +static int shdma_setup_slave(struct shdma_chan *schan, dma_addr_t slave_addr) +{ + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + int ret, match; + + if (schan->dev->of_node) { + match = schan->hw_req; + ret = ops->set_slave(schan, match, slave_addr, true); + if (ret < 0) + return ret; + } else { + match = schan->real_slave_id; + } + + if (schan->real_slave_id < 0 || schan->real_slave_id >= slave_num) + return -EINVAL; + + if (test_and_set_bit(schan->real_slave_id, shdma_slave_used)) + return -EBUSY; + + ret = ops->set_slave(schan, match, slave_addr, false); + if (ret < 0) { + clear_bit(schan->real_slave_id, shdma_slave_used); + return ret; + } + + schan->slave_id = schan->real_slave_id; + + return 0; +} + +static int shdma_alloc_chan_resources(struct dma_chan *chan) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + struct shdma_desc *desc; + struct shdma_slave *slave = chan->private; + int ret, i; + + /* + * This relies on the guarantee from dmaengine that alloc_chan_resources + * never runs concurrently with itself or free_chan_resources. + */ + if (slave) { + /* Legacy mode: .private is set in filter */ + schan->real_slave_id = slave->slave_id; + ret = shdma_setup_slave(schan, 0); + if (ret < 0) + goto esetslave; + } else { + /* Normal mode: real_slave_id was set by filter */ + schan->slave_id = -EINVAL; + } + + schan->desc = kcalloc(NR_DESCS_PER_CHANNEL, + sdev->desc_size, GFP_KERNEL); + if (!schan->desc) { + ret = -ENOMEM; + goto edescalloc; + } + schan->desc_num = NR_DESCS_PER_CHANNEL; + + for (i = 0; i < NR_DESCS_PER_CHANNEL; i++) { + desc = ops->embedded_desc(schan->desc, i); + dma_async_tx_descriptor_init(&desc->async_tx, + &schan->dma_chan); + desc->async_tx.tx_submit = shdma_tx_submit; + desc->mark = DESC_IDLE; + + list_add(&desc->node, &schan->ld_free); + } + + return NR_DESCS_PER_CHANNEL; + +edescalloc: + if (slave) +esetslave: + clear_bit(slave->slave_id, shdma_slave_used); + chan->private = NULL; + return ret; +} + +/* + * This is the standard shdma filter function to be used as a replacement to the + * "old" method, using the .private pointer. + * You always have to pass a valid slave id as the argument, old drivers that + * pass ERR_PTR(-EINVAL) as a filter parameter and set it up in dma_slave_config + * need to be updated so we can remove the slave_id field from dma_slave_config. + * parameter. If this filter is used, the slave driver, after calling + * dma_request_channel(), will also have to call dmaengine_slave_config() with + * .direction, and either .src_addr or .dst_addr set. + * + * NOTE: this filter doesn't support multiple DMAC drivers with the DMA_SLAVE + * capability! If this becomes a requirement, hardware glue drivers, using this + * services would have to provide their own filters, which first would check + * the device driver, similar to how other DMAC drivers, e.g., sa11x0-dma.c, do + * this, and only then, in case of a match, call this common filter. + * NOTE 2: This filter function is also used in the DT case by shdma_of_xlate(). + * In that case the MID-RID value is used for slave channel filtering and is + * passed to this function in the "arg" parameter. + */ +bool shdma_chan_filter(struct dma_chan *chan, void *arg) +{ + struct shdma_chan *schan; + struct shdma_dev *sdev; + int slave_id = (long)arg; + int ret; + + /* Only support channels handled by this driver. */ + if (chan->device->device_alloc_chan_resources != + shdma_alloc_chan_resources) + return false; + + schan = to_shdma_chan(chan); + sdev = to_shdma_dev(chan->device); + + /* + * For DT, the schan->slave_id field is generated by the + * set_slave function from the slave ID that is passed in + * from xlate. For the non-DT case, the slave ID is + * directly passed into the filter function by the driver + */ + if (schan->dev->of_node) { + ret = sdev->ops->set_slave(schan, slave_id, 0, true); + if (ret < 0) + return false; + + schan->real_slave_id = schan->slave_id; + return true; + } + + if (slave_id < 0) { + /* No slave requested - arbitrary channel */ + dev_warn(sdev->dma_dev.dev, "invalid slave ID passed to dma_request_slave\n"); + return true; + } + + if (slave_id >= slave_num) + return false; + + ret = sdev->ops->set_slave(schan, slave_id, 0, true); + if (ret < 0) + return false; + + schan->real_slave_id = slave_id; + + return true; +} +EXPORT_SYMBOL(shdma_chan_filter); + +static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all) +{ + struct shdma_desc *desc, *_desc; + /* Is the "exposed" head of a chain acked? */ + bool head_acked = false; + dma_cookie_t cookie = 0; + dma_async_tx_callback callback = NULL; + void *param = NULL; + unsigned long flags; + LIST_HEAD(cyclic_list); + + spin_lock_irqsave(&schan->chan_lock, flags); + list_for_each_entry_safe(desc, _desc, &schan->ld_queue, node) { + struct dma_async_tx_descriptor *tx = &desc->async_tx; + + BUG_ON(tx->cookie > 0 && tx->cookie != desc->cookie); + BUG_ON(desc->mark != DESC_SUBMITTED && + desc->mark != DESC_COMPLETED && + desc->mark != DESC_WAITING); + + /* + * queue is ordered, and we use this loop to (1) clean up all + * completed descriptors, and to (2) update descriptor flags of + * any chunks in a (partially) completed chain + */ + if (!all && desc->mark == DESC_SUBMITTED && + desc->cookie != cookie) + break; + + if (tx->cookie > 0) + cookie = tx->cookie; + + if (desc->mark == DESC_COMPLETED && desc->chunks == 1) { + if (schan->dma_chan.completed_cookie != desc->cookie - 1) + dev_dbg(schan->dev, + "Completing cookie %d, expected %d\n", + desc->cookie, + schan->dma_chan.completed_cookie + 1); + schan->dma_chan.completed_cookie = desc->cookie; + } + + /* Call callback on the last chunk */ + if (desc->mark == DESC_COMPLETED && tx->callback) { + desc->mark = DESC_WAITING; + callback = tx->callback; + param = tx->callback_param; + dev_dbg(schan->dev, "descriptor #%d@%p on %d callback\n", + tx->cookie, tx, schan->id); + BUG_ON(desc->chunks != 1); + break; + } + + if (tx->cookie > 0 || tx->cookie == -EBUSY) { + if (desc->mark == DESC_COMPLETED) { + BUG_ON(tx->cookie < 0); + desc->mark = DESC_WAITING; + } + head_acked = async_tx_test_ack(tx); + } else { + switch (desc->mark) { + case DESC_COMPLETED: + desc->mark = DESC_WAITING; + /* Fall through */ + case DESC_WAITING: + if (head_acked) + async_tx_ack(&desc->async_tx); + } + } + + dev_dbg(schan->dev, "descriptor %p #%d completed.\n", + tx, tx->cookie); + + if (((desc->mark == DESC_COMPLETED || + desc->mark == DESC_WAITING) && + async_tx_test_ack(&desc->async_tx)) || all) { + + if (all || !desc->cyclic) { + /* Remove from ld_queue list */ + desc->mark = DESC_IDLE; + list_move(&desc->node, &schan->ld_free); + } else { + /* reuse as cyclic */ + desc->mark = DESC_SUBMITTED; + list_move_tail(&desc->node, &cyclic_list); + } + + if (list_empty(&schan->ld_queue)) { + dev_dbg(schan->dev, "Bring down channel %d\n", schan->id); + pm_runtime_put(schan->dev); + schan->pm_state = SHDMA_PM_ESTABLISHED; + } else if (schan->pm_state == SHDMA_PM_PENDING) { + shdma_chan_xfer_ld_queue(schan); + } + } + } + + if (all && !callback) + /* + * Terminating and the loop completed normally: forgive + * uncompleted cookies + */ + schan->dma_chan.completed_cookie = schan->dma_chan.cookie; + + list_splice_tail(&cyclic_list, &schan->ld_queue); + + spin_unlock_irqrestore(&schan->chan_lock, flags); + + if (callback) + callback(param); + + return callback; +} + +/* + * shdma_chan_ld_cleanup - Clean up link descriptors + * + * Clean up the ld_queue of DMA channel. + */ +static void shdma_chan_ld_cleanup(struct shdma_chan *schan, bool all) +{ + while (__ld_cleanup(schan, all)) + ; +} + +/* + * shdma_free_chan_resources - Free all resources of the channel. + */ +static void shdma_free_chan_resources(struct dma_chan *chan) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(chan->device); + const struct shdma_ops *ops = sdev->ops; + LIST_HEAD(list); + + /* Protect against ISR */ + spin_lock_irq(&schan->chan_lock); + ops->halt_channel(schan); + spin_unlock_irq(&schan->chan_lock); + + /* Now no new interrupts will occur */ + + /* Prepared and not submitted descriptors can still be on the queue */ + if (!list_empty(&schan->ld_queue)) + shdma_chan_ld_cleanup(schan, true); + + if (schan->slave_id >= 0) { + /* The caller is holding dma_list_mutex */ + clear_bit(schan->slave_id, shdma_slave_used); + chan->private = NULL; + } + + schan->real_slave_id = 0; + + spin_lock_irq(&schan->chan_lock); + + list_splice_init(&schan->ld_free, &list); + schan->desc_num = 0; + + spin_unlock_irq(&schan->chan_lock); + + kfree(schan->desc); +} + +/** + * shdma_add_desc - get, set up and return one transfer descriptor + * @schan: DMA channel + * @flags: DMA transfer flags + * @dst: destination DMA address, incremented when direction equals + * DMA_DEV_TO_MEM or DMA_MEM_TO_MEM + * @src: source DMA address, incremented when direction equals + * DMA_MEM_TO_DEV or DMA_MEM_TO_MEM + * @len: DMA transfer length + * @first: if NULL, set to the current descriptor and cookie set to -EBUSY + * @direction: needed for slave DMA to decide which address to keep constant, + * equals DMA_MEM_TO_MEM for MEMCPY + * Returns 0 or an error + * Locks: called with desc_lock held + */ +static struct shdma_desc *shdma_add_desc(struct shdma_chan *schan, + unsigned long flags, dma_addr_t *dst, dma_addr_t *src, size_t *len, + struct shdma_desc **first, enum dma_transfer_direction direction) +{ + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + struct shdma_desc *new; + size_t copy_size = *len; + + if (!copy_size) + return NULL; + + /* Allocate the link descriptor from the free list */ + new = shdma_get_desc(schan); + if (!new) { + dev_err(schan->dev, "No free link descriptor available\n"); + return NULL; + } + + ops->desc_setup(schan, new, *src, *dst, ©_size); + + if (!*first) { + /* First desc */ + new->async_tx.cookie = -EBUSY; + *first = new; + } else { + /* Other desc - invisible to the user */ + new->async_tx.cookie = -EINVAL; + } + + dev_dbg(schan->dev, + "chaining (%zu/%zu)@%pad -> %pad with %p, cookie %d\n", + copy_size, *len, src, dst, &new->async_tx, + new->async_tx.cookie); + + new->mark = DESC_PREPARED; + new->async_tx.flags = flags; + new->direction = direction; + new->partial = 0; + + *len -= copy_size; + if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV) + *src += copy_size; + if (direction == DMA_MEM_TO_MEM || direction == DMA_DEV_TO_MEM) + *dst += copy_size; + + return new; +} + +/* + * shdma_prep_sg - prepare transfer descriptors from an SG list + * + * Common routine for public (MEMCPY) and slave DMA. The MEMCPY case is also + * converted to scatter-gather to guarantee consistent locking and a correct + * list manipulation. For slave DMA direction carries the usual meaning, and, + * logically, the SG list is RAM and the addr variable contains slave address, + * e.g., the FIFO I/O register. For MEMCPY direction equals DMA_MEM_TO_MEM + * and the SG list contains only one element and points at the source buffer. + */ +static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan, + struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr, + enum dma_transfer_direction direction, unsigned long flags, bool cyclic) +{ + struct scatterlist *sg; + struct shdma_desc *first = NULL, *new = NULL /* compiler... */; + LIST_HEAD(tx_list); + int chunks = 0; + unsigned long irq_flags; + int i; + + for_each_sg(sgl, sg, sg_len, i) + chunks += DIV_ROUND_UP(sg_dma_len(sg), schan->max_xfer_len); + + /* Have to lock the whole loop to protect against concurrent release */ + spin_lock_irqsave(&schan->chan_lock, irq_flags); + + /* + * Chaining: + * first descriptor is what user is dealing with in all API calls, its + * cookie is at first set to -EBUSY, at tx-submit to a positive + * number + * if more than one chunk is needed further chunks have cookie = -EINVAL + * the last chunk, if not equal to the first, has cookie = -ENOSPC + * all chunks are linked onto the tx_list head with their .node heads + * only during this function, then they are immediately spliced + * back onto the free list in form of a chain + */ + for_each_sg(sgl, sg, sg_len, i) { + dma_addr_t sg_addr = sg_dma_address(sg); + size_t len = sg_dma_len(sg); + + if (!len) + goto err_get_desc; + + do { + dev_dbg(schan->dev, "Add SG #%d@%p[%zu], dma %pad\n", + i, sg, len, &sg_addr); + + if (direction == DMA_DEV_TO_MEM) + new = shdma_add_desc(schan, flags, + &sg_addr, addr, &len, &first, + direction); + else + new = shdma_add_desc(schan, flags, + addr, &sg_addr, &len, &first, + direction); + if (!new) + goto err_get_desc; + + new->cyclic = cyclic; + if (cyclic) + new->chunks = 1; + else + new->chunks = chunks--; + list_add_tail(&new->node, &tx_list); + } while (len); + } + + if (new != first) + new->async_tx.cookie = -ENOSPC; + + /* Put them back on the free list, so, they don't get lost */ + list_splice_tail(&tx_list, &schan->ld_free); + + spin_unlock_irqrestore(&schan->chan_lock, irq_flags); + + return &first->async_tx; + +err_get_desc: + list_for_each_entry(new, &tx_list, node) + new->mark = DESC_IDLE; + list_splice(&tx_list, &schan->ld_free); + + spin_unlock_irqrestore(&schan->chan_lock, irq_flags); + + return NULL; +} + +static struct dma_async_tx_descriptor *shdma_prep_memcpy( + struct dma_chan *chan, dma_addr_t dma_dest, dma_addr_t dma_src, + size_t len, unsigned long flags) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct scatterlist sg; + + if (!chan || !len) + return NULL; + + BUG_ON(!schan->desc_num); + + sg_init_table(&sg, 1); + sg_set_page(&sg, pfn_to_page(PFN_DOWN(dma_src)), len, + offset_in_page(dma_src)); + sg_dma_address(&sg) = dma_src; + sg_dma_len(&sg) = len; + + return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, + flags, false); +} + +static struct dma_async_tx_descriptor *shdma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, void *context) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + int slave_id = schan->slave_id; + dma_addr_t slave_addr; + + if (!chan) + return NULL; + + BUG_ON(!schan->desc_num); + + /* Someone calling slave DMA on a generic channel? */ + if (slave_id < 0 || !sg_len) { + dev_warn(schan->dev, "%s: bad parameter: len=%d, id=%d\n", + __func__, sg_len, slave_id); + return NULL; + } + + slave_addr = ops->slave_addr(schan); + + return shdma_prep_sg(schan, sgl, sg_len, &slave_addr, + direction, flags, false); +} + +#define SHDMA_MAX_SG_LEN 32 + +static struct dma_async_tx_descriptor *shdma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + struct dma_async_tx_descriptor *desc; + const struct shdma_ops *ops = sdev->ops; + unsigned int sg_len = buf_len / period_len; + int slave_id = schan->slave_id; + dma_addr_t slave_addr; + struct scatterlist *sgl; + int i; + + if (!chan) + return NULL; + + BUG_ON(!schan->desc_num); + + if (sg_len > SHDMA_MAX_SG_LEN) { + dev_err(schan->dev, "sg length %d exceds limit %d", + sg_len, SHDMA_MAX_SG_LEN); + return NULL; + } + + /* Someone calling slave DMA on a generic channel? */ + if (slave_id < 0 || (buf_len < period_len)) { + dev_warn(schan->dev, + "%s: bad parameter: buf_len=%zu, period_len=%zu, id=%d\n", + __func__, buf_len, period_len, slave_id); + return NULL; + } + + slave_addr = ops->slave_addr(schan); + + /* + * Allocate the sg list dynamically as it would consumer too much stack + * space. + */ + sgl = kcalloc(sg_len, sizeof(*sgl), GFP_KERNEL); + if (!sgl) + return NULL; + + sg_init_table(sgl, sg_len); + + for (i = 0; i < sg_len; i++) { + dma_addr_t src = buf_addr + (period_len * i); + + sg_set_page(&sgl[i], pfn_to_page(PFN_DOWN(src)), period_len, + offset_in_page(src)); + sg_dma_address(&sgl[i]) = src; + sg_dma_len(&sgl[i]) = period_len; + } + + desc = shdma_prep_sg(schan, sgl, sg_len, &slave_addr, + direction, flags, true); + + kfree(sgl); + return desc; +} + +static int shdma_terminate_all(struct dma_chan *chan) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(chan->device); + const struct shdma_ops *ops = sdev->ops; + unsigned long flags; + + spin_lock_irqsave(&schan->chan_lock, flags); + ops->halt_channel(schan); + + if (ops->get_partial && !list_empty(&schan->ld_queue)) { + /* Record partial transfer */ + struct shdma_desc *desc = list_first_entry(&schan->ld_queue, + struct shdma_desc, node); + desc->partial = ops->get_partial(schan, desc); + } + + spin_unlock_irqrestore(&schan->chan_lock, flags); + + shdma_chan_ld_cleanup(schan, true); + + return 0; +} + +static int shdma_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + + /* + * So far only .slave_id is used, but the slave drivers are + * encouraged to also set a transfer direction and an address. + */ + if (!config) + return -EINVAL; + + /* + * overriding the slave_id through dma_slave_config is deprecated, + * but possibly some out-of-tree drivers still do it. + */ + if (WARN_ON_ONCE(config->slave_id && + config->slave_id != schan->real_slave_id)) + schan->real_slave_id = config->slave_id; + + /* + * We could lock this, but you shouldn't be configuring the + * channel, while using it... + */ + return shdma_setup_slave(schan, + config->direction == DMA_DEV_TO_MEM ? + config->src_addr : config->dst_addr); +} + +static void shdma_issue_pending(struct dma_chan *chan) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + + spin_lock_irq(&schan->chan_lock); + if (schan->pm_state == SHDMA_PM_ESTABLISHED) + shdma_chan_xfer_ld_queue(schan); + else + schan->pm_state = SHDMA_PM_PENDING; + spin_unlock_irq(&schan->chan_lock); +} + +static enum dma_status shdma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + enum dma_status status; + unsigned long flags; + + shdma_chan_ld_cleanup(schan, false); + + spin_lock_irqsave(&schan->chan_lock, flags); + + status = dma_cookie_status(chan, cookie, txstate); + + /* + * If we don't find cookie on the queue, it has been aborted and we have + * to report error + */ + if (status != DMA_COMPLETE) { + struct shdma_desc *sdesc; + status = DMA_ERROR; + list_for_each_entry(sdesc, &schan->ld_queue, node) + if (sdesc->cookie == cookie) { + status = DMA_IN_PROGRESS; + break; + } + } + + spin_unlock_irqrestore(&schan->chan_lock, flags); + + return status; +} + +/* Called from error IRQ or NMI */ +bool shdma_reset(struct shdma_dev *sdev) +{ + const struct shdma_ops *ops = sdev->ops; + struct shdma_chan *schan; + unsigned int handled = 0; + int i; + + /* Reset all channels */ + shdma_for_each_chan(schan, sdev, i) { + struct shdma_desc *sdesc; + LIST_HEAD(dl); + + if (!schan) + continue; + + spin_lock(&schan->chan_lock); + + /* Stop the channel */ + ops->halt_channel(schan); + + list_splice_init(&schan->ld_queue, &dl); + + if (!list_empty(&dl)) { + dev_dbg(schan->dev, "Bring down channel %d\n", schan->id); + pm_runtime_put(schan->dev); + } + schan->pm_state = SHDMA_PM_ESTABLISHED; + + spin_unlock(&schan->chan_lock); + + /* Complete all */ + list_for_each_entry(sdesc, &dl, node) { + struct dma_async_tx_descriptor *tx = &sdesc->async_tx; + sdesc->mark = DESC_IDLE; + if (tx->callback) + tx->callback(tx->callback_param); + } + + spin_lock(&schan->chan_lock); + list_splice(&dl, &schan->ld_free); + spin_unlock(&schan->chan_lock); + + handled++; + } + + return !!handled; +} +EXPORT_SYMBOL(shdma_reset); + +static irqreturn_t chan_irq(int irq, void *dev) +{ + struct shdma_chan *schan = dev; + const struct shdma_ops *ops = + to_shdma_dev(schan->dma_chan.device)->ops; + irqreturn_t ret; + + spin_lock(&schan->chan_lock); + + ret = ops->chan_irq(schan, irq) ? IRQ_WAKE_THREAD : IRQ_NONE; + + spin_unlock(&schan->chan_lock); + + return ret; +} + +static irqreturn_t chan_irqt(int irq, void *dev) +{ + struct shdma_chan *schan = dev; + const struct shdma_ops *ops = + to_shdma_dev(schan->dma_chan.device)->ops; + struct shdma_desc *sdesc; + + spin_lock_irq(&schan->chan_lock); + list_for_each_entry(sdesc, &schan->ld_queue, node) { + if (sdesc->mark == DESC_SUBMITTED && + ops->desc_completed(schan, sdesc)) { + dev_dbg(schan->dev, "done #%d@%p\n", + sdesc->async_tx.cookie, &sdesc->async_tx); + sdesc->mark = DESC_COMPLETED; + break; + } + } + /* Next desc */ + shdma_chan_xfer_ld_queue(schan); + spin_unlock_irq(&schan->chan_lock); + + shdma_chan_ld_cleanup(schan, false); + + return IRQ_HANDLED; +} + +int shdma_request_irq(struct shdma_chan *schan, int irq, + unsigned long flags, const char *name) +{ + int ret = devm_request_threaded_irq(schan->dev, irq, chan_irq, + chan_irqt, flags, name, schan); + + schan->irq = ret < 0 ? ret : irq; + + return ret; +} +EXPORT_SYMBOL(shdma_request_irq); + +void shdma_chan_probe(struct shdma_dev *sdev, + struct shdma_chan *schan, int id) +{ + schan->pm_state = SHDMA_PM_ESTABLISHED; + + /* reference struct dma_device */ + schan->dma_chan.device = &sdev->dma_dev; + dma_cookie_init(&schan->dma_chan); + + schan->dev = sdev->dma_dev.dev; + schan->id = id; + + if (!schan->max_xfer_len) + schan->max_xfer_len = PAGE_SIZE; + + spin_lock_init(&schan->chan_lock); + + /* Init descripter manage list */ + INIT_LIST_HEAD(&schan->ld_queue); + INIT_LIST_HEAD(&schan->ld_free); + + /* Add the channel to DMA device channel list */ + list_add_tail(&schan->dma_chan.device_node, + &sdev->dma_dev.channels); + sdev->schan[id] = schan; +} +EXPORT_SYMBOL(shdma_chan_probe); + +void shdma_chan_remove(struct shdma_chan *schan) +{ + list_del(&schan->dma_chan.device_node); +} +EXPORT_SYMBOL(shdma_chan_remove); + +int shdma_init(struct device *dev, struct shdma_dev *sdev, + int chan_num) +{ + struct dma_device *dma_dev = &sdev->dma_dev; + + /* + * Require all call-backs for now, they can trivially be made optional + * later as required + */ + if (!sdev->ops || + !sdev->desc_size || + !sdev->ops->embedded_desc || + !sdev->ops->start_xfer || + !sdev->ops->setup_xfer || + !sdev->ops->set_slave || + !sdev->ops->desc_setup || + !sdev->ops->slave_addr || + !sdev->ops->channel_busy || + !sdev->ops->halt_channel || + !sdev->ops->desc_completed) + return -EINVAL; + + sdev->schan = kcalloc(chan_num, sizeof(*sdev->schan), GFP_KERNEL); + if (!sdev->schan) + return -ENOMEM; + + INIT_LIST_HEAD(&dma_dev->channels); + + /* Common and MEMCPY operations */ + dma_dev->device_alloc_chan_resources + = shdma_alloc_chan_resources; + dma_dev->device_free_chan_resources = shdma_free_chan_resources; + dma_dev->device_prep_dma_memcpy = shdma_prep_memcpy; + dma_dev->device_tx_status = shdma_tx_status; + dma_dev->device_issue_pending = shdma_issue_pending; + + /* Compulsory for DMA_SLAVE fields */ + dma_dev->device_prep_slave_sg = shdma_prep_slave_sg; + dma_dev->device_prep_dma_cyclic = shdma_prep_dma_cyclic; + dma_dev->device_config = shdma_config; + dma_dev->device_terminate_all = shdma_terminate_all; + + dma_dev->dev = dev; + + return 0; +} +EXPORT_SYMBOL(shdma_init); + +void shdma_cleanup(struct shdma_dev *sdev) +{ + kfree(sdev->schan); +} +EXPORT_SYMBOL(shdma_cleanup); + +static int __init shdma_enter(void) +{ + shdma_slave_used = kzalloc(DIV_ROUND_UP(slave_num, BITS_PER_LONG) * + sizeof(long), GFP_KERNEL); + if (!shdma_slave_used) + return -ENOMEM; + return 0; +} +module_init(shdma_enter); + +static void __exit shdma_exit(void) +{ + kfree(shdma_slave_used); +} +module_exit(shdma_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("SH-DMA driver base library"); +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); diff --git a/drivers/dma/sh/shdma-of.c b/drivers/dma/sh/shdma-of.c new file mode 100644 index 000000000..f999f9b0d --- /dev/null +++ b/drivers/dma/sh/shdma-of.c @@ -0,0 +1,79 @@ +/* + * SHDMA Device Tree glue + * + * Copyright (C) 2013 Renesas Electronics Inc. + * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * + * This is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/dmaengine.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/shdma-base.h> + +#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan) + +static struct dma_chan *shdma_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + u32 id = dma_spec->args[0]; + dma_cap_mask_t mask; + struct dma_chan *chan; + + if (dma_spec->args_count != 1) + return NULL; + + dma_cap_zero(mask); + /* Only slave DMA channels can be allocated via DT */ + dma_cap_set(DMA_SLAVE, mask); + + chan = dma_request_channel(mask, shdma_chan_filter, + (void *)(uintptr_t)id); + if (chan) + to_shdma_chan(chan)->hw_req = id; + + return chan; +} + +static int shdma_of_probe(struct platform_device *pdev) +{ + const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev); + int ret; + + ret = of_dma_controller_register(pdev->dev.of_node, + shdma_of_xlate, pdev); + if (ret < 0) + return ret; + + ret = of_platform_populate(pdev->dev.of_node, NULL, lookup, &pdev->dev); + if (ret < 0) + of_dma_controller_free(pdev->dev.of_node); + + return ret; +} + +static const struct of_device_id shdma_of_match[] = { + { .compatible = "renesas,shdma-mux", }, + { } +}; +MODULE_DEVICE_TABLE(of, sh_dmae_of_match); + +static struct platform_driver shdma_of = { + .driver = { + .name = "shdma-of", + .of_match_table = shdma_of_match, + }, + .probe = shdma_of_probe, +}; + +module_platform_driver(shdma_of); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("SH-DMA driver DT glue"); +MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); diff --git a/drivers/dma/sh/shdma-r8a73a4.c b/drivers/dma/sh/shdma-r8a73a4.c new file mode 100644 index 000000000..4fb99970a --- /dev/null +++ b/drivers/dma/sh/shdma-r8a73a4.c @@ -0,0 +1,77 @@ +/* + * Renesas SuperH DMA Engine support for r8a73a4 (APE6) SoCs + * + * Copyright (C) 2013 Renesas Electronics, Inc. + * + * This is free software; you can redistribute it and/or modify it under the + * terms of version 2 the GNU General Public License as published by the Free + * Software Foundation. + */ +#include <linux/sh_dma.h> + +#include "shdma-arm.h" + +const unsigned int dma_ts_shift[] = SH_DMAE_TS_SHIFT; + +static const struct sh_dmae_slave_config dma_slaves[] = { + { + .chcr = CHCR_TX(XMIT_SZ_32BIT), + .mid_rid = 0xd1, /* MMC0 Tx */ + }, { + .chcr = CHCR_RX(XMIT_SZ_32BIT), + .mid_rid = 0xd2, /* MMC0 Rx */ + }, { + .chcr = CHCR_TX(XMIT_SZ_32BIT), + .mid_rid = 0xe1, /* MMC1 Tx */ + }, { + .chcr = CHCR_RX(XMIT_SZ_32BIT), + .mid_rid = 0xe2, /* MMC1 Rx */ + }, +}; + +#define DMAE_CHANNEL(a, b) \ + { \ + .offset = (a) - 0x20, \ + .dmars = (a) - 0x20 + 0x40, \ + .chclr_bit = (b), \ + .chclr_offset = 0x80 - 0x20, \ + } + +static const struct sh_dmae_channel dma_channels[] = { + DMAE_CHANNEL(0x8000, 0), + DMAE_CHANNEL(0x8080, 1), + DMAE_CHANNEL(0x8100, 2), + DMAE_CHANNEL(0x8180, 3), + DMAE_CHANNEL(0x8200, 4), + DMAE_CHANNEL(0x8280, 5), + DMAE_CHANNEL(0x8300, 6), + DMAE_CHANNEL(0x8380, 7), + DMAE_CHANNEL(0x8400, 8), + DMAE_CHANNEL(0x8480, 9), + DMAE_CHANNEL(0x8500, 10), + DMAE_CHANNEL(0x8580, 11), + DMAE_CHANNEL(0x8600, 12), + DMAE_CHANNEL(0x8680, 13), + DMAE_CHANNEL(0x8700, 14), + DMAE_CHANNEL(0x8780, 15), + DMAE_CHANNEL(0x8800, 16), + DMAE_CHANNEL(0x8880, 17), + DMAE_CHANNEL(0x8900, 18), + DMAE_CHANNEL(0x8980, 19), +}; + +const struct sh_dmae_pdata r8a73a4_dma_pdata = { + .slave = dma_slaves, + .slave_num = ARRAY_SIZE(dma_slaves), + .channel = dma_channels, + .channel_num = ARRAY_SIZE(dma_channels), + .ts_low_shift = TS_LOW_SHIFT, + .ts_low_mask = TS_LOW_BIT << TS_LOW_SHIFT, + .ts_high_shift = TS_HI_SHIFT, + .ts_high_mask = TS_HI_BIT << TS_HI_SHIFT, + .ts_shift = dma_ts_shift, + .ts_shift_num = ARRAY_SIZE(dma_ts_shift), + .dmaor_init = DMAOR_DME, + .chclr_present = 1, + .chclr_bitwise = 1, +}; diff --git a/drivers/dma/sh/shdma.h b/drivers/dma/sh/shdma.h new file mode 100644 index 000000000..2c0a969ad --- /dev/null +++ b/drivers/dma/sh/shdma.h @@ -0,0 +1,72 @@ +/* + * Renesas SuperH DMA Engine support + * + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ +#ifndef __DMA_SHDMA_H +#define __DMA_SHDMA_H + +#include <linux/sh_dma.h> +#include <linux/shdma-base.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/list.h> + +#define SH_DMAE_MAX_CHANNELS 20 +#define SH_DMAE_TCR_MAX 0x00FFFFFF /* 16MB */ + +struct device; + +struct sh_dmae_chan { + struct shdma_chan shdma_chan; + const struct sh_dmae_slave_config *config; /* Slave DMA configuration */ + int xmit_shift; /* log_2(bytes_per_xfer) */ + void __iomem *base; + char dev_id[16]; /* unique name per DMAC of channel */ + int pm_error; + dma_addr_t slave_addr; +}; + +struct sh_dmae_device { + struct shdma_dev shdma_dev; + struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS]; + const struct sh_dmae_pdata *pdata; + struct list_head node; + void __iomem *chan_reg; + void __iomem *dmars; + unsigned int chcr_offset; + u32 chcr_ie_bit; +}; + +struct sh_dmae_regs { + u32 sar; /* SAR / source address */ + u32 dar; /* DAR / destination address */ + u32 tcr; /* TCR / transfer count */ +}; + +struct sh_dmae_desc { + struct sh_dmae_regs hw; + struct shdma_desc shdma_desc; +}; + +#define to_sh_chan(chan) container_of(chan, struct sh_dmae_chan, shdma_chan) +#define to_sh_desc(lh) container_of(lh, struct sh_desc, node) +#define tx_to_sh_desc(tx) container_of(tx, struct sh_desc, async_tx) +#define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\ + struct sh_dmae_device, shdma_dev.dma_dev) + +#ifdef CONFIG_SH_DMAE_R8A73A4 +extern const struct sh_dmae_pdata r8a73a4_dma_pdata; +#define r8a73a4_shdma_devid (&r8a73a4_dma_pdata) +#else +#define r8a73a4_shdma_devid NULL +#endif + +#endif /* __DMA_SHDMA_H */ diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c new file mode 100644 index 000000000..11707df1a --- /dev/null +++ b/drivers/dma/sh/shdmac.c @@ -0,0 +1,962 @@ +/* + * Renesas SuperH DMA Engine support + * + * base is drivers/dma/flsdma.c + * + * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * - DMA of SuperH does not have Hardware DMA chain mode. + * - MAX DMA size is 16MB. + * + */ + +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kdebug.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/rculist.h> +#include <linux/sh_dma.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "../dmaengine.h" +#include "shdma.h" + +/* DMA registers */ +#define SAR 0x00 /* Source Address Register */ +#define DAR 0x04 /* Destination Address Register */ +#define TCR 0x08 /* Transfer Count Register */ +#define CHCR 0x0C /* Channel Control Register */ +#define DMAOR 0x40 /* DMA Operation Register */ + +#define TEND 0x18 /* USB-DMAC */ + +#define SH_DMAE_DRV_NAME "sh-dma-engine" + +/* Default MEMCPY transfer size = 2^2 = 4 bytes */ +#define LOG2_DEFAULT_XFER_SIZE 2 +#define SH_DMA_SLAVE_NUMBER 256 +#define SH_DMA_TCR_MAX (16 * 1024 * 1024 - 1) + +/* + * Used for write-side mutual exclusion for the global device list, + * read-side synchronization by way of RCU, and per-controller data. + */ +static DEFINE_SPINLOCK(sh_dmae_lock); +static LIST_HEAD(sh_dmae_devices); + +/* + * Different DMAC implementations provide different ways to clear DMA channels: + * (1) none - no CHCLR registers are available + * (2) one CHCLR register per channel - 0 has to be written to it to clear + * channel buffers + * (3) one CHCLR per several channels - 1 has to be written to the bit, + * corresponding to the specific channel to reset it + */ +static void channel_clear(struct sh_dmae_chan *sh_dc) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel + + sh_dc->shdma_chan.id; + u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0; + + __raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset); +} + +static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg) +{ + __raw_writel(data, sh_dc->base + reg); +} + +static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg) +{ + return __raw_readl(sh_dc->base + reg); +} + +static u16 dmaor_read(struct sh_dmae_device *shdev) +{ + void __iomem *addr = shdev->chan_reg + DMAOR; + + if (shdev->pdata->dmaor_is_32bit) + return __raw_readl(addr); + else + return __raw_readw(addr); +} + +static void dmaor_write(struct sh_dmae_device *shdev, u16 data) +{ + void __iomem *addr = shdev->chan_reg + DMAOR; + + if (shdev->pdata->dmaor_is_32bit) + __raw_writel(data, addr); + else + __raw_writew(data, addr); +} + +static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + + __raw_writel(data, sh_dc->base + shdev->chcr_offset); +} + +static u32 chcr_read(struct sh_dmae_chan *sh_dc) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_dc); + + return __raw_readl(sh_dc->base + shdev->chcr_offset); +} + +/* + * Reset DMA controller + * + * SH7780 has two DMAOR register + */ +static void sh_dmae_ctl_stop(struct sh_dmae_device *shdev) +{ + unsigned short dmaor; + unsigned long flags; + + spin_lock_irqsave(&sh_dmae_lock, flags); + + dmaor = dmaor_read(shdev); + dmaor_write(shdev, dmaor & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME)); + + spin_unlock_irqrestore(&sh_dmae_lock, flags); +} + +static int sh_dmae_rst(struct sh_dmae_device *shdev) +{ + unsigned short dmaor; + unsigned long flags; + + spin_lock_irqsave(&sh_dmae_lock, flags); + + dmaor = dmaor_read(shdev) & ~(DMAOR_NMIF | DMAOR_AE | DMAOR_DME); + + if (shdev->pdata->chclr_present) { + int i; + for (i = 0; i < shdev->pdata->channel_num; i++) { + struct sh_dmae_chan *sh_chan = shdev->chan[i]; + if (sh_chan) + channel_clear(sh_chan); + } + } + + dmaor_write(shdev, dmaor | shdev->pdata->dmaor_init); + + dmaor = dmaor_read(shdev); + + spin_unlock_irqrestore(&sh_dmae_lock, flags); + + if (dmaor & (DMAOR_AE | DMAOR_NMIF)) { + dev_warn(shdev->shdma_dev.dma_dev.dev, "Can't initialize DMAOR.\n"); + return -EIO; + } + if (shdev->pdata->dmaor_init & ~dmaor) + dev_warn(shdev->shdma_dev.dma_dev.dev, + "DMAOR=0x%x hasn't latched the initial value 0x%x.\n", + dmaor, shdev->pdata->dmaor_init); + return 0; +} + +static bool dmae_is_busy(struct sh_dmae_chan *sh_chan) +{ + u32 chcr = chcr_read(sh_chan); + + if ((chcr & (CHCR_DE | CHCR_TE)) == CHCR_DE) + return true; /* working */ + + return false; /* waiting */ +} + +static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) | + ((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift); + + if (cnt >= pdata->ts_shift_num) + cnt = 0; + + return pdata->ts_shift[cnt]; +} + +static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + int i; + + for (i = 0; i < pdata->ts_shift_num; i++) + if (pdata->ts_shift[i] == l2size) + break; + + if (i == pdata->ts_shift_num) + i = 0; + + return ((i << pdata->ts_low_shift) & pdata->ts_low_mask) | + ((i << pdata->ts_high_shift) & pdata->ts_high_mask); +} + +static void dmae_set_reg(struct sh_dmae_chan *sh_chan, struct sh_dmae_regs *hw) +{ + sh_dmae_writel(sh_chan, hw->sar, SAR); + sh_dmae_writel(sh_chan, hw->dar, DAR); + sh_dmae_writel(sh_chan, hw->tcr >> sh_chan->xmit_shift, TCR); +} + +static void dmae_start(struct sh_dmae_chan *sh_chan) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + u32 chcr = chcr_read(sh_chan); + + if (shdev->pdata->needs_tend_set) + sh_dmae_writel(sh_chan, 0xFFFFFFFF, TEND); + + chcr |= CHCR_DE | shdev->chcr_ie_bit; + chcr_write(sh_chan, chcr & ~CHCR_TE); +} + +static void dmae_init(struct sh_dmae_chan *sh_chan) +{ + /* + * Default configuration for dual address memory-memory transfer. + */ + u32 chcr = DM_INC | SM_INC | RS_AUTO | log2size_to_chcr(sh_chan, + LOG2_DEFAULT_XFER_SIZE); + sh_chan->xmit_shift = calc_xmit_shift(sh_chan, chcr); + chcr_write(sh_chan, chcr); +} + +static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val) +{ + /* If DMA is active, cannot set CHCR. TODO: remove this superfluous check */ + if (dmae_is_busy(sh_chan)) + return -EBUSY; + + sh_chan->xmit_shift = calc_xmit_shift(sh_chan, val); + chcr_write(sh_chan, val); + + return 0; +} + +static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id]; + void __iomem *addr = shdev->dmars; + unsigned int shift = chan_pdata->dmars_bit; + + if (dmae_is_busy(sh_chan)) + return -EBUSY; + + if (pdata->no_dmars) + return 0; + + /* in the case of a missing DMARS resource use first memory window */ + if (!addr) + addr = shdev->chan_reg; + addr += chan_pdata->dmars; + + __raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift), + addr); + + return 0; +} + +static void sh_dmae_start_xfer(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + dev_dbg(sh_chan->shdma_chan.dev, "Queue #%d to %d: %u@%x -> %x\n", + sdesc->async_tx.cookie, sh_chan->shdma_chan.id, + sh_desc->hw.tcr, sh_desc->hw.sar, sh_desc->hw.dar); + /* Get the ld start address from ld_queue */ + dmae_set_reg(sh_chan, &sh_desc->hw); + dmae_start(sh_chan); +} + +static bool sh_dmae_channel_busy(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + return dmae_is_busy(sh_chan); +} + +static void sh_dmae_setup_xfer(struct shdma_chan *schan, + int slave_id) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + + if (slave_id >= 0) { + const struct sh_dmae_slave_config *cfg = + sh_chan->config; + + dmae_set_dmars(sh_chan, cfg->mid_rid); + dmae_set_chcr(sh_chan, cfg->chcr); + } else { + dmae_init(sh_chan); + } +} + +/* + * Find a slave channel configuration from the contoller list by either a slave + * ID in the non-DT case, or by a MID/RID value in the DT case + */ +static const struct sh_dmae_slave_config *dmae_find_slave( + struct sh_dmae_chan *sh_chan, int match) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + const struct sh_dmae_pdata *pdata = shdev->pdata; + const struct sh_dmae_slave_config *cfg; + int i; + + if (!sh_chan->shdma_chan.dev->of_node) { + if (match >= SH_DMA_SLAVE_NUMBER) + return NULL; + + for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) + if (cfg->slave_id == match) + return cfg; + } else { + for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) + if (cfg->mid_rid == match) { + sh_chan->shdma_chan.slave_id = i; + return cfg; + } + } + + return NULL; +} + +static int sh_dmae_set_slave(struct shdma_chan *schan, + int slave_id, dma_addr_t slave_addr, bool try) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id); + if (!cfg) + return -ENXIO; + + if (!try) { + sh_chan->config = cfg; + sh_chan->slave_addr = slave_addr ? : cfg->addr; + } + + return 0; +} + +static void dmae_halt(struct sh_dmae_chan *sh_chan) +{ + struct sh_dmae_device *shdev = to_sh_dev(sh_chan); + u32 chcr = chcr_read(sh_chan); + + chcr &= ~(CHCR_DE | CHCR_TE | shdev->chcr_ie_bit); + chcr_write(sh_chan, chcr); +} + +static int sh_dmae_desc_setup(struct shdma_chan *schan, + struct shdma_desc *sdesc, + dma_addr_t src, dma_addr_t dst, size_t *len) +{ + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + + if (*len > schan->max_xfer_len) + *len = schan->max_xfer_len; + + sh_desc->hw.sar = src; + sh_desc->hw.dar = dst; + sh_desc->hw.tcr = *len; + + return 0; +} + +static void sh_dmae_halt(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + dmae_halt(sh_chan); +} + +static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + + if (!(chcr_read(sh_chan) & CHCR_TE)) + return false; + + /* DMA stop */ + dmae_halt(sh_chan); + + return true; +} + +static size_t sh_dmae_get_partial(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan, + shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + return sh_desc->hw.tcr - + (sh_dmae_readl(sh_chan, TCR) << sh_chan->xmit_shift); +} + +/* Called from error IRQ or NMI */ +static bool sh_dmae_reset(struct sh_dmae_device *shdev) +{ + bool ret; + + /* halt the dma controller */ + sh_dmae_ctl_stop(shdev); + + /* We cannot detect, which channel caused the error, have to reset all */ + ret = shdma_reset(&shdev->shdma_dev); + + sh_dmae_rst(shdev); + + return ret; +} + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) +static irqreturn_t sh_dmae_err(int irq, void *data) +{ + struct sh_dmae_device *shdev = data; + + if (!(dmaor_read(shdev) & DMAOR_AE)) + return IRQ_NONE; + + sh_dmae_reset(shdev); + return IRQ_HANDLED; +} +#endif + +static bool sh_dmae_desc_completed(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, + struct sh_dmae_chan, shdma_chan); + struct sh_dmae_desc *sh_desc = container_of(sdesc, + struct sh_dmae_desc, shdma_desc); + u32 sar_buf = sh_dmae_readl(sh_chan, SAR); + u32 dar_buf = sh_dmae_readl(sh_chan, DAR); + + return (sdesc->direction == DMA_DEV_TO_MEM && + (sh_desc->hw.dar + sh_desc->hw.tcr) == dar_buf) || + (sdesc->direction != DMA_DEV_TO_MEM && + (sh_desc->hw.sar + sh_desc->hw.tcr) == sar_buf); +} + +static bool sh_dmae_nmi_notify(struct sh_dmae_device *shdev) +{ + /* Fast path out if NMIF is not asserted for this controller */ + if ((dmaor_read(shdev) & DMAOR_NMIF) == 0) + return false; + + return sh_dmae_reset(shdev); +} + +static int sh_dmae_nmi_handler(struct notifier_block *self, + unsigned long cmd, void *data) +{ + struct sh_dmae_device *shdev; + int ret = NOTIFY_DONE; + bool triggered; + + /* + * Only concern ourselves with NMI events. + * + * Normally we would check the die chain value, but as this needs + * to be architecture independent, check for NMI context instead. + */ + if (!in_nmi()) + return NOTIFY_DONE; + + rcu_read_lock(); + list_for_each_entry_rcu(shdev, &sh_dmae_devices, node) { + /* + * Only stop if one of the controllers has NMIF asserted, + * we do not want to interfere with regular address error + * handling or NMI events that don't concern the DMACs. + */ + triggered = sh_dmae_nmi_notify(shdev); + if (triggered == true) + ret = NOTIFY_OK; + } + rcu_read_unlock(); + + return ret; +} + +static struct notifier_block sh_dmae_nmi_notifier __read_mostly = { + .notifier_call = sh_dmae_nmi_handler, + + /* Run before NMI debug handler and KGDB */ + .priority = 1, +}; + +static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id, + int irq, unsigned long flags) +{ + const struct sh_dmae_channel *chan_pdata = &shdev->pdata->channel[id]; + struct shdma_dev *sdev = &shdev->shdma_dev; + struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); + struct sh_dmae_chan *sh_chan; + struct shdma_chan *schan; + int err; + + sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan), + GFP_KERNEL); + if (!sh_chan) { + dev_err(sdev->dma_dev.dev, + "No free memory for allocating dma channels!\n"); + return -ENOMEM; + } + + schan = &sh_chan->shdma_chan; + schan->max_xfer_len = SH_DMA_TCR_MAX + 1; + + shdma_chan_probe(sdev, schan, id); + + sh_chan->base = shdev->chan_reg + chan_pdata->offset; + + /* set up channel irq */ + if (pdev->id >= 0) + snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), + "sh-dmae%d.%d", pdev->id, id); + else + snprintf(sh_chan->dev_id, sizeof(sh_chan->dev_id), + "sh-dma%d", id); + + err = shdma_request_irq(schan, irq, flags, sh_chan->dev_id); + if (err) { + dev_err(sdev->dma_dev.dev, + "DMA channel %d request_irq error %d\n", + id, err); + goto err_no_irq; + } + + shdev->chan[id] = sh_chan; + return 0; + +err_no_irq: + /* remove from dmaengine device node */ + shdma_chan_remove(schan); + return err; +} + +static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) +{ + struct shdma_chan *schan; + int i; + + shdma_for_each_chan(schan, &shdev->shdma_dev, i) { + BUG_ON(!schan); + + shdma_chan_remove(schan); + } +} + +#ifdef CONFIG_PM +static int sh_dmae_runtime_suspend(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + + sh_dmae_ctl_stop(shdev); + return 0; +} + +static int sh_dmae_runtime_resume(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + + return sh_dmae_rst(shdev); +} +#endif + +#ifdef CONFIG_PM_SLEEP +static int sh_dmae_suspend(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + + sh_dmae_ctl_stop(shdev); + return 0; +} + +static int sh_dmae_resume(struct device *dev) +{ + struct sh_dmae_device *shdev = dev_get_drvdata(dev); + int i, ret; + + ret = sh_dmae_rst(shdev); + if (ret < 0) + dev_err(dev, "Failed to reset!\n"); + + for (i = 0; i < shdev->pdata->channel_num; i++) { + struct sh_dmae_chan *sh_chan = shdev->chan[i]; + + if (!sh_chan->shdma_chan.desc_num) + continue; + + if (sh_chan->shdma_chan.slave_id >= 0) { + const struct sh_dmae_slave_config *cfg = sh_chan->config; + dmae_set_dmars(sh_chan, cfg->mid_rid); + dmae_set_chcr(sh_chan, cfg->chcr); + } else { + dmae_init(sh_chan); + } + } + + return 0; +} +#endif + +static const struct dev_pm_ops sh_dmae_pm = { + SET_SYSTEM_SLEEP_PM_OPS(sh_dmae_suspend, sh_dmae_resume) + SET_RUNTIME_PM_OPS(sh_dmae_runtime_suspend, sh_dmae_runtime_resume, + NULL) +}; + +static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan) +{ + struct sh_dmae_chan *sh_chan = container_of(schan, + struct sh_dmae_chan, shdma_chan); + + /* + * Implicit BUG_ON(!sh_chan->config) + * This is an exclusive slave DMA operation, may only be called after a + * successful slave configuration. + */ + return sh_chan->slave_addr; +} + +static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i) +{ + return &((struct sh_dmae_desc *)buf)[i].shdma_desc; +} + +static const struct shdma_ops sh_dmae_shdma_ops = { + .desc_completed = sh_dmae_desc_completed, + .halt_channel = sh_dmae_halt, + .channel_busy = sh_dmae_channel_busy, + .slave_addr = sh_dmae_slave_addr, + .desc_setup = sh_dmae_desc_setup, + .set_slave = sh_dmae_set_slave, + .setup_xfer = sh_dmae_setup_xfer, + .start_xfer = sh_dmae_start_xfer, + .embedded_desc = sh_dmae_embedded_desc, + .chan_irq = sh_dmae_chan_irq, + .get_partial = sh_dmae_get_partial, +}; + +static const struct of_device_id sh_dmae_of_match[] = { + {.compatible = "renesas,shdma-r8a73a4", .data = r8a73a4_shdma_devid,}, + {} +}; +MODULE_DEVICE_TABLE(of, sh_dmae_of_match); + +static int sh_dmae_probe(struct platform_device *pdev) +{ + const enum dma_slave_buswidth widths = + DMA_SLAVE_BUSWIDTH_1_BYTE | DMA_SLAVE_BUSWIDTH_2_BYTES | + DMA_SLAVE_BUSWIDTH_4_BYTES | DMA_SLAVE_BUSWIDTH_8_BYTES | + DMA_SLAVE_BUSWIDTH_16_BYTES | DMA_SLAVE_BUSWIDTH_32_BYTES; + const struct sh_dmae_pdata *pdata; + unsigned long chan_flag[SH_DMAE_MAX_CHANNELS] = {}; + int chan_irq[SH_DMAE_MAX_CHANNELS]; +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) + unsigned long irqflags = 0; + int errirq; +#endif + int err, i, irq_cnt = 0, irqres = 0, irq_cap = 0; + struct sh_dmae_device *shdev; + struct dma_device *dma_dev; + struct resource *chan, *dmars, *errirq_res, *chanirq_res; + + if (pdev->dev.of_node) + pdata = of_match_device(sh_dmae_of_match, &pdev->dev)->data; + else + pdata = dev_get_platdata(&pdev->dev); + + /* get platform data */ + if (!pdata || !pdata->channel_num) + return -ENODEV; + + chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); + /* DMARS area is optional */ + dmars = platform_get_resource(pdev, IORESOURCE_MEM, 1); + /* + * IRQ resources: + * 1. there always must be at least one IRQ IO-resource. On SH4 it is + * the error IRQ, in which case it is the only IRQ in this resource: + * start == end. If it is the only IRQ resource, all channels also + * use the same IRQ. + * 2. DMA channel IRQ resources can be specified one per resource or in + * ranges (start != end) + * 3. iff all events (channels and, optionally, error) on this + * controller use the same IRQ, only one IRQ resource can be + * specified, otherwise there must be one IRQ per channel, even if + * some of them are equal + * 4. if all IRQs on this controller are equal or if some specific IRQs + * specify IORESOURCE_IRQ_SHAREABLE in their resources, they will be + * requested with the IRQF_SHARED flag + */ + errirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!chan || !errirq_res) + return -ENODEV; + + shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device), + GFP_KERNEL); + if (!shdev) { + dev_err(&pdev->dev, "Not enough memory\n"); + return -ENOMEM; + } + + dma_dev = &shdev->shdma_dev.dma_dev; + + shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); + if (IS_ERR(shdev->chan_reg)) + return PTR_ERR(shdev->chan_reg); + if (dmars) { + shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars); + if (IS_ERR(shdev->dmars)) + return PTR_ERR(shdev->dmars); + } + + dma_dev->src_addr_widths = widths; + dma_dev->dst_addr_widths = widths; + dma_dev->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); + dma_dev->residue_granularity = DMA_RESIDUE_GRANULARITY_DESCRIPTOR; + + if (!pdata->slave_only) + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + if (pdata->slave && pdata->slave_num) + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + + /* Default transfer size of 32 bytes requires 32-byte alignment */ + dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE; + + shdev->shdma_dev.ops = &sh_dmae_shdma_ops; + shdev->shdma_dev.desc_size = sizeof(struct sh_dmae_desc); + err = shdma_init(&pdev->dev, &shdev->shdma_dev, + pdata->channel_num); + if (err < 0) + goto eshdma; + + /* platform data */ + shdev->pdata = pdata; + + if (pdata->chcr_offset) + shdev->chcr_offset = pdata->chcr_offset; + else + shdev->chcr_offset = CHCR; + + if (pdata->chcr_ie_bit) + shdev->chcr_ie_bit = pdata->chcr_ie_bit; + else + shdev->chcr_ie_bit = CHCR_IE; + + platform_set_drvdata(pdev, shdev); + + pm_runtime_enable(&pdev->dev); + err = pm_runtime_get_sync(&pdev->dev); + if (err < 0) + dev_err(&pdev->dev, "%s(): GET = %d\n", __func__, err); + + spin_lock_irq(&sh_dmae_lock); + list_add_tail_rcu(&shdev->node, &sh_dmae_devices); + spin_unlock_irq(&sh_dmae_lock); + + /* reset dma controller - only needed as a test */ + err = sh_dmae_rst(shdev); + if (err) + goto rst_err; + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) + chanirq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 1); + + if (!chanirq_res) + chanirq_res = errirq_res; + else + irqres++; + + if (chanirq_res == errirq_res || + (errirq_res->flags & IORESOURCE_BITS) == IORESOURCE_IRQ_SHAREABLE) + irqflags = IRQF_SHARED; + + errirq = errirq_res->start; + + err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags, + "DMAC Address Error", shdev); + if (err) { + dev_err(&pdev->dev, + "DMA failed requesting irq #%d, error %d\n", + errirq, err); + goto eirq_err; + } + +#else + chanirq_res = errirq_res; +#endif /* CONFIG_CPU_SH4 || CONFIG_ARCH_SHMOBILE */ + + if (chanirq_res->start == chanirq_res->end && + !platform_get_resource(pdev, IORESOURCE_IRQ, 1)) { + /* Special case - all multiplexed */ + for (; irq_cnt < pdata->channel_num; irq_cnt++) { + if (irq_cnt < SH_DMAE_MAX_CHANNELS) { + chan_irq[irq_cnt] = chanirq_res->start; + chan_flag[irq_cnt] = IRQF_SHARED; + } else { + irq_cap = 1; + break; + } + } + } else { + do { + for (i = chanirq_res->start; i <= chanirq_res->end; i++) { + if (irq_cnt >= SH_DMAE_MAX_CHANNELS) { + irq_cap = 1; + break; + } + + if ((errirq_res->flags & IORESOURCE_BITS) == + IORESOURCE_IRQ_SHAREABLE) + chan_flag[irq_cnt] = IRQF_SHARED; + else + chan_flag[irq_cnt] = 0; + dev_dbg(&pdev->dev, + "Found IRQ %d for channel %d\n", + i, irq_cnt); + chan_irq[irq_cnt++] = i; + } + + if (irq_cnt >= SH_DMAE_MAX_CHANNELS) + break; + + chanirq_res = platform_get_resource(pdev, + IORESOURCE_IRQ, ++irqres); + } while (irq_cnt < pdata->channel_num && chanirq_res); + } + + /* Create DMA Channel */ + for (i = 0; i < irq_cnt; i++) { + err = sh_dmae_chan_probe(shdev, i, chan_irq[i], chan_flag[i]); + if (err) + goto chan_probe_err; + } + + if (irq_cap) + dev_notice(&pdev->dev, "Attempting to register %d DMA " + "channels when a maximum of %d are supported.\n", + pdata->channel_num, SH_DMAE_MAX_CHANNELS); + + pm_runtime_put(&pdev->dev); + + err = dma_async_device_register(&shdev->shdma_dev.dma_dev); + if (err < 0) + goto edmadevreg; + + return err; + +edmadevreg: + pm_runtime_get(&pdev->dev); + +chan_probe_err: + sh_dmae_chan_remove(shdev); + +#if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE) +eirq_err: +#endif +rst_err: + spin_lock_irq(&sh_dmae_lock); + list_del_rcu(&shdev->node); + spin_unlock_irq(&sh_dmae_lock); + + pm_runtime_put(&pdev->dev); + pm_runtime_disable(&pdev->dev); + + shdma_cleanup(&shdev->shdma_dev); +eshdma: + synchronize_rcu(); + + return err; +} + +static int sh_dmae_remove(struct platform_device *pdev) +{ + struct sh_dmae_device *shdev = platform_get_drvdata(pdev); + struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; + + dma_async_device_unregister(dma_dev); + + spin_lock_irq(&sh_dmae_lock); + list_del_rcu(&shdev->node); + spin_unlock_irq(&sh_dmae_lock); + + pm_runtime_disable(&pdev->dev); + + sh_dmae_chan_remove(shdev); + shdma_cleanup(&shdev->shdma_dev); + + synchronize_rcu(); + + return 0; +} + +static struct platform_driver sh_dmae_driver = { + .driver = { + .pm = &sh_dmae_pm, + .name = SH_DMAE_DRV_NAME, + .of_match_table = sh_dmae_of_match, + }, + .remove = sh_dmae_remove, +}; + +static int __init sh_dmae_init(void) +{ + /* Wire up NMI handling */ + int err = register_die_notifier(&sh_dmae_nmi_notifier); + if (err) + return err; + + return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe); +} +module_init(sh_dmae_init); + +static void __exit sh_dmae_exit(void) +{ + platform_driver_unregister(&sh_dmae_driver); + + unregister_die_notifier(&sh_dmae_nmi_notifier); +} +module_exit(sh_dmae_exit); + +MODULE_AUTHOR("Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>"); +MODULE_DESCRIPTION("Renesas SH DMA Engine driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" SH_DMAE_DRV_NAME); diff --git a/drivers/dma/sh/sudmac.c b/drivers/dma/sh/sudmac.c new file mode 100644 index 000000000..6da2eaa6c --- /dev/null +++ b/drivers/dma/sh/sudmac.c @@ -0,0 +1,422 @@ +/* + * Renesas SUDMAC support + * + * Copyright (C) 2013 Renesas Solutions Corp. + * + * based on drivers/dma/sh/shdma.c: + * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de> + * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> + * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved. + * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved. + * + * This is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/dmaengine.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/sudmac.h> + +struct sudmac_chan { + struct shdma_chan shdma_chan; + void __iomem *base; + char dev_id[16]; /* unique name per DMAC of channel */ + + u32 offset; /* for CFG, BA, BBC, CA, CBC, DEN */ + u32 cfg; + u32 dint_end_bit; +}; + +struct sudmac_device { + struct shdma_dev shdma_dev; + struct sudmac_pdata *pdata; + void __iomem *chan_reg; +}; + +struct sudmac_regs { + u32 base_addr; + u32 base_byte_count; +}; + +struct sudmac_desc { + struct sudmac_regs hw; + struct shdma_desc shdma_desc; +}; + +#define to_chan(schan) container_of(schan, struct sudmac_chan, shdma_chan) +#define to_desc(sdesc) container_of(sdesc, struct sudmac_desc, shdma_desc) +#define to_sdev(sc) container_of(sc->shdma_chan.dma_chan.device, \ + struct sudmac_device, shdma_dev.dma_dev) + +/* SUDMAC register */ +#define SUDMAC_CH0CFG 0x00 +#define SUDMAC_CH0BA 0x10 +#define SUDMAC_CH0BBC 0x18 +#define SUDMAC_CH0CA 0x20 +#define SUDMAC_CH0CBC 0x28 +#define SUDMAC_CH0DEN 0x30 +#define SUDMAC_DSTSCLR 0x38 +#define SUDMAC_DBUFCTRL 0x3C +#define SUDMAC_DINTCTRL 0x40 +#define SUDMAC_DINTSTS 0x44 +#define SUDMAC_DINTSTSCLR 0x48 +#define SUDMAC_CH0SHCTRL 0x50 + +/* Definitions for the sudmac_channel.config */ +#define SUDMAC_SENDBUFM 0x1000 /* b12: Transmit Buffer Mode */ +#define SUDMAC_RCVENDM 0x0100 /* b8: Receive Data Transfer End Mode */ +#define SUDMAC_LBA_WAIT 0x0030 /* b5-4: Local Bus Access Wait */ + +/* Definitions for the sudmac_channel.dint_end_bit */ +#define SUDMAC_CH1ENDE 0x0002 /* b1: Ch1 DMA Transfer End Int Enable */ +#define SUDMAC_CH0ENDE 0x0001 /* b0: Ch0 DMA Transfer End Int Enable */ + +#define SUDMAC_DRV_NAME "sudmac" + +static void sudmac_writel(struct sudmac_chan *sc, u32 data, u32 reg) +{ + iowrite32(data, sc->base + reg); +} + +static u32 sudmac_readl(struct sudmac_chan *sc, u32 reg) +{ + return ioread32(sc->base + reg); +} + +static bool sudmac_is_busy(struct sudmac_chan *sc) +{ + u32 den = sudmac_readl(sc, SUDMAC_CH0DEN + sc->offset); + + if (den) + return true; /* working */ + + return false; /* waiting */ +} + +static void sudmac_set_reg(struct sudmac_chan *sc, struct sudmac_regs *hw, + struct shdma_desc *sdesc) +{ + sudmac_writel(sc, sc->cfg, SUDMAC_CH0CFG + sc->offset); + sudmac_writel(sc, hw->base_addr, SUDMAC_CH0BA + sc->offset); + sudmac_writel(sc, hw->base_byte_count, SUDMAC_CH0BBC + sc->offset); +} + +static void sudmac_start(struct sudmac_chan *sc) +{ + u32 dintctrl = sudmac_readl(sc, SUDMAC_DINTCTRL); + + sudmac_writel(sc, dintctrl | sc->dint_end_bit, SUDMAC_DINTCTRL); + sudmac_writel(sc, 1, SUDMAC_CH0DEN + sc->offset); +} + +static void sudmac_start_xfer(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sudmac_chan *sc = to_chan(schan); + struct sudmac_desc *sd = to_desc(sdesc); + + sudmac_set_reg(sc, &sd->hw, sdesc); + sudmac_start(sc); +} + +static bool sudmac_channel_busy(struct shdma_chan *schan) +{ + struct sudmac_chan *sc = to_chan(schan); + + return sudmac_is_busy(sc); +} + +static void sudmac_setup_xfer(struct shdma_chan *schan, int slave_id) +{ +} + +static const struct sudmac_slave_config *sudmac_find_slave( + struct sudmac_chan *sc, int slave_id) +{ + struct sudmac_device *sdev = to_sdev(sc); + struct sudmac_pdata *pdata = sdev->pdata; + const struct sudmac_slave_config *cfg; + int i; + + for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++) + if (cfg->slave_id == slave_id) + return cfg; + + return NULL; +} + +static int sudmac_set_slave(struct shdma_chan *schan, int slave_id, + dma_addr_t slave_addr, bool try) +{ + struct sudmac_chan *sc = to_chan(schan); + const struct sudmac_slave_config *cfg = sudmac_find_slave(sc, slave_id); + + if (!cfg) + return -ENODEV; + + return 0; +} + +static inline void sudmac_dma_halt(struct sudmac_chan *sc) +{ + u32 dintctrl = sudmac_readl(sc, SUDMAC_DINTCTRL); + + sudmac_writel(sc, 0, SUDMAC_CH0DEN + sc->offset); + sudmac_writel(sc, dintctrl & ~sc->dint_end_bit, SUDMAC_DINTCTRL); + sudmac_writel(sc, sc->dint_end_bit, SUDMAC_DINTSTSCLR); +} + +static int sudmac_desc_setup(struct shdma_chan *schan, + struct shdma_desc *sdesc, + dma_addr_t src, dma_addr_t dst, size_t *len) +{ + struct sudmac_chan *sc = to_chan(schan); + struct sudmac_desc *sd = to_desc(sdesc); + + dev_dbg(sc->shdma_chan.dev, "%s: src=%pad, dst=%pad, len=%zu\n", + __func__, &src, &dst, *len); + + if (*len > schan->max_xfer_len) + *len = schan->max_xfer_len; + + if (dst) + sd->hw.base_addr = dst; + else if (src) + sd->hw.base_addr = src; + sd->hw.base_byte_count = *len; + + return 0; +} + +static void sudmac_halt(struct shdma_chan *schan) +{ + struct sudmac_chan *sc = to_chan(schan); + + sudmac_dma_halt(sc); +} + +static bool sudmac_chan_irq(struct shdma_chan *schan, int irq) +{ + struct sudmac_chan *sc = to_chan(schan); + u32 dintsts = sudmac_readl(sc, SUDMAC_DINTSTS); + + if (!(dintsts & sc->dint_end_bit)) + return false; + + /* DMA stop */ + sudmac_dma_halt(sc); + + return true; +} + +static size_t sudmac_get_partial(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sudmac_chan *sc = to_chan(schan); + struct sudmac_desc *sd = to_desc(sdesc); + u32 current_byte_count = sudmac_readl(sc, SUDMAC_CH0CBC + sc->offset); + + return sd->hw.base_byte_count - current_byte_count; +} + +static bool sudmac_desc_completed(struct shdma_chan *schan, + struct shdma_desc *sdesc) +{ + struct sudmac_chan *sc = to_chan(schan); + struct sudmac_desc *sd = to_desc(sdesc); + u32 current_addr = sudmac_readl(sc, SUDMAC_CH0CA + sc->offset); + + return sd->hw.base_addr + sd->hw.base_byte_count == current_addr; +} + +static int sudmac_chan_probe(struct sudmac_device *su_dev, int id, int irq, + unsigned long flags) +{ + struct shdma_dev *sdev = &su_dev->shdma_dev; + struct platform_device *pdev = to_platform_device(sdev->dma_dev.dev); + struct sudmac_chan *sc; + struct shdma_chan *schan; + int err; + + sc = devm_kzalloc(&pdev->dev, sizeof(struct sudmac_chan), GFP_KERNEL); + if (!sc) { + dev_err(sdev->dma_dev.dev, + "No free memory for allocating dma channels!\n"); + return -ENOMEM; + } + + schan = &sc->shdma_chan; + schan->max_xfer_len = 64 * 1024 * 1024 - 1; + + shdma_chan_probe(sdev, schan, id); + + sc->base = su_dev->chan_reg; + + /* get platform_data */ + sc->offset = su_dev->pdata->channel->offset; + if (su_dev->pdata->channel->config & SUDMAC_TX_BUFFER_MODE) + sc->cfg |= SUDMAC_SENDBUFM; + if (su_dev->pdata->channel->config & SUDMAC_RX_END_MODE) + sc->cfg |= SUDMAC_RCVENDM; + sc->cfg |= (su_dev->pdata->channel->wait << 4) & SUDMAC_LBA_WAIT; + + if (su_dev->pdata->channel->dint_end_bit & SUDMAC_DMA_BIT_CH0) + sc->dint_end_bit |= SUDMAC_CH0ENDE; + if (su_dev->pdata->channel->dint_end_bit & SUDMAC_DMA_BIT_CH1) + sc->dint_end_bit |= SUDMAC_CH1ENDE; + + /* set up channel irq */ + if (pdev->id >= 0) + snprintf(sc->dev_id, sizeof(sc->dev_id), "sudmac%d.%d", + pdev->id, id); + else + snprintf(sc->dev_id, sizeof(sc->dev_id), "sudmac%d", id); + + err = shdma_request_irq(schan, irq, flags, sc->dev_id); + if (err) { + dev_err(sdev->dma_dev.dev, + "DMA channel %d request_irq failed %d\n", id, err); + goto err_no_irq; + } + + return 0; + +err_no_irq: + /* remove from dmaengine device node */ + shdma_chan_remove(schan); + return err; +} + +static void sudmac_chan_remove(struct sudmac_device *su_dev) +{ + struct shdma_chan *schan; + int i; + + shdma_for_each_chan(schan, &su_dev->shdma_dev, i) { + BUG_ON(!schan); + + shdma_chan_remove(schan); + } +} + +static dma_addr_t sudmac_slave_addr(struct shdma_chan *schan) +{ + /* SUDMAC doesn't need the address */ + return 0; +} + +static struct shdma_desc *sudmac_embedded_desc(void *buf, int i) +{ + return &((struct sudmac_desc *)buf)[i].shdma_desc; +} + +static const struct shdma_ops sudmac_shdma_ops = { + .desc_completed = sudmac_desc_completed, + .halt_channel = sudmac_halt, + .channel_busy = sudmac_channel_busy, + .slave_addr = sudmac_slave_addr, + .desc_setup = sudmac_desc_setup, + .set_slave = sudmac_set_slave, + .setup_xfer = sudmac_setup_xfer, + .start_xfer = sudmac_start_xfer, + .embedded_desc = sudmac_embedded_desc, + .chan_irq = sudmac_chan_irq, + .get_partial = sudmac_get_partial, +}; + +static int sudmac_probe(struct platform_device *pdev) +{ + struct sudmac_pdata *pdata = dev_get_platdata(&pdev->dev); + int err, i; + struct sudmac_device *su_dev; + struct dma_device *dma_dev; + struct resource *chan, *irq_res; + + /* get platform data */ + if (!pdata) + return -ENODEV; + + irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (!irq_res) + return -ENODEV; + + err = -ENOMEM; + su_dev = devm_kzalloc(&pdev->dev, sizeof(struct sudmac_device), + GFP_KERNEL); + if (!su_dev) { + dev_err(&pdev->dev, "Not enough memory\n"); + return err; + } + + dma_dev = &su_dev->shdma_dev.dma_dev; + + chan = platform_get_resource(pdev, IORESOURCE_MEM, 0); + su_dev->chan_reg = devm_ioremap_resource(&pdev->dev, chan); + if (IS_ERR(su_dev->chan_reg)) + return PTR_ERR(su_dev->chan_reg); + + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + + su_dev->shdma_dev.ops = &sudmac_shdma_ops; + su_dev->shdma_dev.desc_size = sizeof(struct sudmac_desc); + err = shdma_init(&pdev->dev, &su_dev->shdma_dev, pdata->channel_num); + if (err < 0) + return err; + + /* platform data */ + su_dev->pdata = dev_get_platdata(&pdev->dev); + + platform_set_drvdata(pdev, su_dev); + + /* Create DMA Channel */ + for (i = 0; i < pdata->channel_num; i++) { + err = sudmac_chan_probe(su_dev, i, irq_res->start, IRQF_SHARED); + if (err) + goto chan_probe_err; + } + + err = dma_async_device_register(&su_dev->shdma_dev.dma_dev); + if (err < 0) + goto chan_probe_err; + + return err; + +chan_probe_err: + sudmac_chan_remove(su_dev); + + shdma_cleanup(&su_dev->shdma_dev); + + return err; +} + +static int sudmac_remove(struct platform_device *pdev) +{ + struct sudmac_device *su_dev = platform_get_drvdata(pdev); + struct dma_device *dma_dev = &su_dev->shdma_dev.dma_dev; + + dma_async_device_unregister(dma_dev); + sudmac_chan_remove(su_dev); + shdma_cleanup(&su_dev->shdma_dev); + + return 0; +} + +static struct platform_driver sudmac_driver = { + .driver = { + .name = SUDMAC_DRV_NAME, + }, + .probe = sudmac_probe, + .remove = sudmac_remove, +}; +module_platform_driver(sudmac_driver); + +MODULE_AUTHOR("Yoshihiro Shimoda"); +MODULE_DESCRIPTION("Renesas SUDMAC driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" SUDMAC_DRV_NAME); diff --git a/drivers/dma/sh/usb-dmac.c b/drivers/dma/sh/usb-dmac.c new file mode 100644 index 000000000..ebd8a5f39 --- /dev/null +++ b/drivers/dma/sh/usb-dmac.c @@ -0,0 +1,912 @@ +/* + * Renesas USB DMA Controller Driver + * + * Copyright (C) 2015 Renesas Electronics Corporation + * + * based on rcar-dmac.c + * Copyright (C) 2014 Renesas Electronics Inc. + * Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com> + * + * This is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + */ + +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/spinlock.h> + +#include "../dmaengine.h" +#include "../virt-dma.h" + +/* + * struct usb_dmac_sg - Descriptor for a hardware transfer + * @mem_addr: memory address + * @size: transfer size in bytes + */ +struct usb_dmac_sg { + dma_addr_t mem_addr; + u32 size; +}; + +/* + * struct usb_dmac_desc - USB DMA Transfer Descriptor + * @vd: base virtual channel DMA transaction descriptor + * @direction: direction of the DMA transfer + * @sg_allocated_len: length of allocated sg + * @sg_len: length of sg + * @sg_index: index of sg + * @residue: residue after the DMAC completed a transfer + * @node: node for desc_got and desc_freed + * @done_cookie: cookie after the DMAC completed a transfer + * @sg: information for the transfer + */ +struct usb_dmac_desc { + struct virt_dma_desc vd; + enum dma_transfer_direction direction; + unsigned int sg_allocated_len; + unsigned int sg_len; + unsigned int sg_index; + u32 residue; + struct list_head node; + dma_cookie_t done_cookie; + struct usb_dmac_sg sg[0]; +}; + +#define to_usb_dmac_desc(vd) container_of(vd, struct usb_dmac_desc, vd) + +/* + * struct usb_dmac_chan - USB DMA Controller Channel + * @vc: base virtual DMA channel object + * @iomem: channel I/O memory base + * @index: index of this channel in the controller + * @irq: irq number of this channel + * @desc: the current descriptor + * @descs_allocated: number of descriptors allocated + * @desc_got: got descriptors + * @desc_freed: freed descriptors after the DMAC completed a transfer + */ +struct usb_dmac_chan { + struct virt_dma_chan vc; + void __iomem *iomem; + unsigned int index; + int irq; + struct usb_dmac_desc *desc; + int descs_allocated; + struct list_head desc_got; + struct list_head desc_freed; +}; + +#define to_usb_dmac_chan(c) container_of(c, struct usb_dmac_chan, vc.chan) + +/* + * struct usb_dmac - USB DMA Controller + * @engine: base DMA engine object + * @dev: the hardware device + * @iomem: remapped I/O memory base + * @n_channels: number of available channels + * @channels: array of DMAC channels + */ +struct usb_dmac { + struct dma_device engine; + struct device *dev; + void __iomem *iomem; + + unsigned int n_channels; + struct usb_dmac_chan *channels; +}; + +#define to_usb_dmac(d) container_of(d, struct usb_dmac, engine) + +/* ----------------------------------------------------------------------------- + * Registers + */ + +#define USB_DMAC_CHAN_OFFSET(i) (0x20 + 0x20 * (i)) + +#define USB_DMASWR 0x0008 +#define USB_DMASWR_SWR (1 << 0) +#define USB_DMAOR 0x0060 +#define USB_DMAOR_AE (1 << 2) +#define USB_DMAOR_DME (1 << 0) + +#define USB_DMASAR 0x0000 +#define USB_DMADAR 0x0004 +#define USB_DMATCR 0x0008 +#define USB_DMATCR_MASK 0x00ffffff +#define USB_DMACHCR 0x0014 +#define USB_DMACHCR_FTE (1 << 24) +#define USB_DMACHCR_NULLE (1 << 16) +#define USB_DMACHCR_NULL (1 << 12) +#define USB_DMACHCR_TS_8B ((0 << 7) | (0 << 6)) +#define USB_DMACHCR_TS_16B ((0 << 7) | (1 << 6)) +#define USB_DMACHCR_TS_32B ((1 << 7) | (0 << 6)) +#define USB_DMACHCR_IE (1 << 5) +#define USB_DMACHCR_SP (1 << 2) +#define USB_DMACHCR_TE (1 << 1) +#define USB_DMACHCR_DE (1 << 0) +#define USB_DMATEND 0x0018 + +/* Hardcode the xfer_shift to 5 (32bytes) */ +#define USB_DMAC_XFER_SHIFT 5 +#define USB_DMAC_XFER_SIZE (1 << USB_DMAC_XFER_SHIFT) +#define USB_DMAC_CHCR_TS USB_DMACHCR_TS_32B +#define USB_DMAC_SLAVE_BUSWIDTH DMA_SLAVE_BUSWIDTH_32_BYTES + +/* for descriptors */ +#define USB_DMAC_INITIAL_NR_DESC 16 +#define USB_DMAC_INITIAL_NR_SG 8 + +/* ----------------------------------------------------------------------------- + * Device access + */ + +static void usb_dmac_write(struct usb_dmac *dmac, u32 reg, u32 data) +{ + writel(data, dmac->iomem + reg); +} + +static u32 usb_dmac_read(struct usb_dmac *dmac, u32 reg) +{ + return readl(dmac->iomem + reg); +} + +static u32 usb_dmac_chan_read(struct usb_dmac_chan *chan, u32 reg) +{ + return readl(chan->iomem + reg); +} + +static void usb_dmac_chan_write(struct usb_dmac_chan *chan, u32 reg, u32 data) +{ + writel(data, chan->iomem + reg); +} + +/* ----------------------------------------------------------------------------- + * Initialization and configuration + */ + +static bool usb_dmac_chan_is_busy(struct usb_dmac_chan *chan) +{ + u32 chcr = usb_dmac_chan_read(chan, USB_DMACHCR); + + return (chcr & (USB_DMACHCR_DE | USB_DMACHCR_TE)) == USB_DMACHCR_DE; +} + +static u32 usb_dmac_calc_tend(u32 size) +{ + /* + * Please refer to the Figure "Example of Final Transaction Valid + * Data Transfer Enable (EDTEN) Setting" in the data sheet. + */ + return 0xffffffff << (32 - (size % USB_DMAC_XFER_SIZE ? : + USB_DMAC_XFER_SIZE)); +} + +/* This function is already held by vc.lock */ +static void usb_dmac_chan_start_sg(struct usb_dmac_chan *chan, + unsigned int index) +{ + struct usb_dmac_desc *desc = chan->desc; + struct usb_dmac_sg *sg = desc->sg + index; + dma_addr_t src_addr = 0, dst_addr = 0; + + WARN_ON_ONCE(usb_dmac_chan_is_busy(chan)); + + if (desc->direction == DMA_DEV_TO_MEM) + dst_addr = sg->mem_addr; + else + src_addr = sg->mem_addr; + + dev_dbg(chan->vc.chan.device->dev, + "chan%u: queue sg %p: %u@%pad -> %pad\n", + chan->index, sg, sg->size, &src_addr, &dst_addr); + + usb_dmac_chan_write(chan, USB_DMASAR, src_addr & 0xffffffff); + usb_dmac_chan_write(chan, USB_DMADAR, dst_addr & 0xffffffff); + usb_dmac_chan_write(chan, USB_DMATCR, + DIV_ROUND_UP(sg->size, USB_DMAC_XFER_SIZE)); + usb_dmac_chan_write(chan, USB_DMATEND, usb_dmac_calc_tend(sg->size)); + + usb_dmac_chan_write(chan, USB_DMACHCR, USB_DMAC_CHCR_TS | + USB_DMACHCR_NULLE | USB_DMACHCR_IE | USB_DMACHCR_DE); +} + +/* This function is already held by vc.lock */ +static void usb_dmac_chan_start_desc(struct usb_dmac_chan *chan) +{ + struct virt_dma_desc *vd; + + vd = vchan_next_desc(&chan->vc); + if (!vd) { + chan->desc = NULL; + return; + } + + /* + * Remove this request from vc->desc_issued. Otherwise, this driver + * will get the previous value from vchan_next_desc() after a transfer + * was completed. + */ + list_del(&vd->node); + + chan->desc = to_usb_dmac_desc(vd); + chan->desc->sg_index = 0; + usb_dmac_chan_start_sg(chan, 0); +} + +static int usb_dmac_init(struct usb_dmac *dmac) +{ + u16 dmaor; + + /* Clear all channels and enable the DMAC globally. */ + usb_dmac_write(dmac, USB_DMAOR, USB_DMAOR_DME); + + dmaor = usb_dmac_read(dmac, USB_DMAOR); + if ((dmaor & (USB_DMAOR_AE | USB_DMAOR_DME)) != USB_DMAOR_DME) { + dev_warn(dmac->dev, "DMAOR initialization failed.\n"); + return -EIO; + } + + return 0; +} + +/* ----------------------------------------------------------------------------- + * Descriptors allocation and free + */ +static int usb_dmac_desc_alloc(struct usb_dmac_chan *chan, unsigned int sg_len, + gfp_t gfp) +{ + struct usb_dmac_desc *desc; + unsigned long flags; + + desc = kzalloc(sizeof(*desc) + sg_len * sizeof(desc->sg[0]), gfp); + if (!desc) + return -ENOMEM; + + desc->sg_allocated_len = sg_len; + INIT_LIST_HEAD(&desc->node); + + spin_lock_irqsave(&chan->vc.lock, flags); + list_add_tail(&desc->node, &chan->desc_freed); + spin_unlock_irqrestore(&chan->vc.lock, flags); + + return 0; +} + +static void usb_dmac_desc_free(struct usb_dmac_chan *chan) +{ + struct usb_dmac_desc *desc, *_desc; + LIST_HEAD(list); + + list_splice_init(&chan->desc_freed, &list); + list_splice_init(&chan->desc_got, &list); + + list_for_each_entry_safe(desc, _desc, &list, node) { + list_del(&desc->node); + kfree(desc); + } + chan->descs_allocated = 0; +} + +static struct usb_dmac_desc *usb_dmac_desc_get(struct usb_dmac_chan *chan, + unsigned int sg_len, gfp_t gfp) +{ + struct usb_dmac_desc *desc = NULL; + unsigned long flags; + + /* Get a freed descritpor */ + spin_lock_irqsave(&chan->vc.lock, flags); + list_for_each_entry(desc, &chan->desc_freed, node) { + if (sg_len <= desc->sg_allocated_len) { + list_move_tail(&desc->node, &chan->desc_got); + spin_unlock_irqrestore(&chan->vc.lock, flags); + return desc; + } + } + spin_unlock_irqrestore(&chan->vc.lock, flags); + + /* Allocate a new descriptor */ + if (!usb_dmac_desc_alloc(chan, sg_len, gfp)) { + /* If allocated the desc, it was added to tail of the list */ + spin_lock_irqsave(&chan->vc.lock, flags); + desc = list_last_entry(&chan->desc_freed, struct usb_dmac_desc, + node); + list_move_tail(&desc->node, &chan->desc_got); + spin_unlock_irqrestore(&chan->vc.lock, flags); + return desc; + } + + return NULL; +} + +static void usb_dmac_desc_put(struct usb_dmac_chan *chan, + struct usb_dmac_desc *desc) +{ + unsigned long flags; + + spin_lock_irqsave(&chan->vc.lock, flags); + list_move_tail(&desc->node, &chan->desc_freed); + spin_unlock_irqrestore(&chan->vc.lock, flags); +} + +/* ----------------------------------------------------------------------------- + * Stop and reset + */ + +static void usb_dmac_soft_reset(struct usb_dmac_chan *uchan) +{ + struct dma_chan *chan = &uchan->vc.chan; + struct usb_dmac *dmac = to_usb_dmac(chan->device); + int i; + + /* Don't issue soft reset if any one of channels is busy */ + for (i = 0; i < dmac->n_channels; ++i) { + if (usb_dmac_chan_is_busy(uchan)) + return; + } + + usb_dmac_write(dmac, USB_DMAOR, 0); + usb_dmac_write(dmac, USB_DMASWR, USB_DMASWR_SWR); + udelay(100); + usb_dmac_write(dmac, USB_DMASWR, 0); + usb_dmac_write(dmac, USB_DMAOR, 1); +} + +static void usb_dmac_chan_halt(struct usb_dmac_chan *chan) +{ + u32 chcr = usb_dmac_chan_read(chan, USB_DMACHCR); + + chcr &= ~(USB_DMACHCR_IE | USB_DMACHCR_TE | USB_DMACHCR_DE); + usb_dmac_chan_write(chan, USB_DMACHCR, chcr); + + usb_dmac_soft_reset(chan); +} + +static void usb_dmac_stop(struct usb_dmac *dmac) +{ + usb_dmac_write(dmac, USB_DMAOR, 0); +} + +/* ----------------------------------------------------------------------------- + * DMA engine operations + */ + +static int usb_dmac_alloc_chan_resources(struct dma_chan *chan) +{ + struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); + int ret; + + while (uchan->descs_allocated < USB_DMAC_INITIAL_NR_DESC) { + ret = usb_dmac_desc_alloc(uchan, USB_DMAC_INITIAL_NR_SG, + GFP_KERNEL); + if (ret < 0) { + usb_dmac_desc_free(uchan); + return ret; + } + uchan->descs_allocated++; + } + + return pm_runtime_get_sync(chan->device->dev); +} + +static void usb_dmac_free_chan_resources(struct dma_chan *chan) +{ + struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); + unsigned long flags; + + /* Protect against ISR */ + spin_lock_irqsave(&uchan->vc.lock, flags); + usb_dmac_chan_halt(uchan); + spin_unlock_irqrestore(&uchan->vc.lock, flags); + + usb_dmac_desc_free(uchan); + vchan_free_chan_resources(&uchan->vc); + + pm_runtime_put(chan->device->dev); +} + +static struct dma_async_tx_descriptor * +usb_dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction dir, + unsigned long dma_flags, void *context) +{ + struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); + struct usb_dmac_desc *desc; + struct scatterlist *sg; + int i; + + if (!sg_len) { + dev_warn(chan->device->dev, + "%s: bad parameter: len=%d\n", __func__, sg_len); + return NULL; + } + + desc = usb_dmac_desc_get(uchan, sg_len, GFP_NOWAIT); + if (!desc) + return NULL; + + desc->direction = dir; + desc->sg_len = sg_len; + for_each_sg(sgl, sg, sg_len, i) { + desc->sg[i].mem_addr = sg_dma_address(sg); + desc->sg[i].size = sg_dma_len(sg); + } + + return vchan_tx_prep(&uchan->vc, &desc->vd, dma_flags); +} + +static int usb_dmac_chan_terminate_all(struct dma_chan *chan) +{ + struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); + struct usb_dmac_desc *desc; + unsigned long flags; + LIST_HEAD(head); + LIST_HEAD(list); + + spin_lock_irqsave(&uchan->vc.lock, flags); + usb_dmac_chan_halt(uchan); + vchan_get_all_descriptors(&uchan->vc, &head); + if (uchan->desc) + uchan->desc = NULL; + list_splice_init(&uchan->desc_got, &list); + list_for_each_entry(desc, &list, node) + list_move_tail(&desc->node, &uchan->desc_freed); + spin_unlock_irqrestore(&uchan->vc.lock, flags); + vchan_dma_desc_free_list(&uchan->vc, &head); + + return 0; +} + +static unsigned int usb_dmac_get_current_residue(struct usb_dmac_chan *chan, + struct usb_dmac_desc *desc, + int sg_index) +{ + struct usb_dmac_sg *sg = desc->sg + sg_index; + u32 mem_addr = sg->mem_addr & 0xffffffff; + unsigned int residue = sg->size; + + /* + * We cannot use USB_DMATCR to calculate residue because USB_DMATCR + * has unsuited value to calculate. + */ + if (desc->direction == DMA_DEV_TO_MEM) + residue -= usb_dmac_chan_read(chan, USB_DMADAR) - mem_addr; + else + residue -= usb_dmac_chan_read(chan, USB_DMASAR) - mem_addr; + + return residue; +} + +static u32 usb_dmac_chan_get_residue_if_complete(struct usb_dmac_chan *chan, + dma_cookie_t cookie) +{ + struct usb_dmac_desc *desc; + u32 residue = 0; + + list_for_each_entry_reverse(desc, &chan->desc_freed, node) { + if (desc->done_cookie == cookie) { + residue = desc->residue; + break; + } + } + + return residue; +} + +static u32 usb_dmac_chan_get_residue(struct usb_dmac_chan *chan, + dma_cookie_t cookie) +{ + u32 residue = 0; + struct virt_dma_desc *vd; + struct usb_dmac_desc *desc = chan->desc; + int i; + + if (!desc) { + vd = vchan_find_desc(&chan->vc, cookie); + if (!vd) + return 0; + desc = to_usb_dmac_desc(vd); + } + + /* Compute the size of all usb_dmac_sg still to be transferred */ + for (i = desc->sg_index + 1; i < desc->sg_len; i++) + residue += desc->sg[i].size; + + /* Add the residue for the current sg */ + residue += usb_dmac_get_current_residue(chan, desc, desc->sg_index); + + return residue; +} + +static enum dma_status usb_dmac_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); + enum dma_status status; + unsigned int residue = 0; + unsigned long flags; + + status = dma_cookie_status(chan, cookie, txstate); + /* a client driver will get residue after DMA_COMPLETE */ + if (!txstate) + return status; + + spin_lock_irqsave(&uchan->vc.lock, flags); + if (status == DMA_COMPLETE) + residue = usb_dmac_chan_get_residue_if_complete(uchan, cookie); + else + residue = usb_dmac_chan_get_residue(uchan, cookie); + spin_unlock_irqrestore(&uchan->vc.lock, flags); + + dma_set_residue(txstate, residue); + + return status; +} + +static void usb_dmac_issue_pending(struct dma_chan *chan) +{ + struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&uchan->vc.lock, flags); + if (vchan_issue_pending(&uchan->vc) && !uchan->desc) + usb_dmac_chan_start_desc(uchan); + spin_unlock_irqrestore(&uchan->vc.lock, flags); +} + +static void usb_dmac_virt_desc_free(struct virt_dma_desc *vd) +{ + struct usb_dmac_desc *desc = to_usb_dmac_desc(vd); + struct usb_dmac_chan *chan = to_usb_dmac_chan(vd->tx.chan); + + usb_dmac_desc_put(chan, desc); +} + +/* ----------------------------------------------------------------------------- + * IRQ handling + */ + +static void usb_dmac_isr_transfer_end(struct usb_dmac_chan *chan) +{ + struct usb_dmac_desc *desc = chan->desc; + + BUG_ON(!desc); + + if (++desc->sg_index < desc->sg_len) { + usb_dmac_chan_start_sg(chan, desc->sg_index); + } else { + desc->residue = usb_dmac_get_current_residue(chan, desc, + desc->sg_index - 1); + desc->done_cookie = desc->vd.tx.cookie; + vchan_cookie_complete(&desc->vd); + + /* Restart the next transfer if this driver has a next desc */ + usb_dmac_chan_start_desc(chan); + } +} + +static irqreturn_t usb_dmac_isr_channel(int irq, void *dev) +{ + struct usb_dmac_chan *chan = dev; + irqreturn_t ret = IRQ_NONE; + u32 mask = USB_DMACHCR_TE; + u32 check_bits = USB_DMACHCR_TE | USB_DMACHCR_SP; + u32 chcr; + + spin_lock(&chan->vc.lock); + + chcr = usb_dmac_chan_read(chan, USB_DMACHCR); + if (chcr & check_bits) + mask |= USB_DMACHCR_DE | check_bits; + if (chcr & USB_DMACHCR_NULL) { + /* An interruption of TE will happen after we set FTE */ + mask |= USB_DMACHCR_NULL; + chcr |= USB_DMACHCR_FTE; + ret |= IRQ_HANDLED; + } + usb_dmac_chan_write(chan, USB_DMACHCR, chcr & ~mask); + + if (chcr & check_bits) { + usb_dmac_isr_transfer_end(chan); + ret |= IRQ_HANDLED; + } + + spin_unlock(&chan->vc.lock); + + return ret; +} + +/* ----------------------------------------------------------------------------- + * OF xlate and channel filter + */ + +static bool usb_dmac_chan_filter(struct dma_chan *chan, void *arg) +{ + struct usb_dmac_chan *uchan = to_usb_dmac_chan(chan); + struct of_phandle_args *dma_spec = arg; + + if (dma_spec->np != chan->device->dev->of_node) + return false; + + /* USB-DMAC should be used with fixed usb controller's FIFO */ + if (uchan->index != dma_spec->args[0]) + return false; + + return true; +} + +static struct dma_chan *usb_dmac_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct usb_dmac_chan *uchan; + struct dma_chan *chan; + dma_cap_mask_t mask; + + if (dma_spec->args_count != 1) + return NULL; + + /* Only slave DMA channels can be allocated via DT */ + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); + + chan = dma_request_channel(mask, usb_dmac_chan_filter, dma_spec); + if (!chan) + return NULL; + + uchan = to_usb_dmac_chan(chan); + + return chan; +} + +/* ----------------------------------------------------------------------------- + * Power management + */ + +#ifdef CONFIG_PM +static int usb_dmac_runtime_suspend(struct device *dev) +{ + struct usb_dmac *dmac = dev_get_drvdata(dev); + int i; + + for (i = 0; i < dmac->n_channels; ++i) + usb_dmac_chan_halt(&dmac->channels[i]); + + return 0; +} + +static int usb_dmac_runtime_resume(struct device *dev) +{ + struct usb_dmac *dmac = dev_get_drvdata(dev); + + return usb_dmac_init(dmac); +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops usb_dmac_pm = { + SET_RUNTIME_PM_OPS(usb_dmac_runtime_suspend, usb_dmac_runtime_resume, + NULL) +}; + +/* ----------------------------------------------------------------------------- + * Probe and remove + */ + +static int usb_dmac_chan_probe(struct usb_dmac *dmac, + struct usb_dmac_chan *uchan, + unsigned int index) +{ + struct platform_device *pdev = to_platform_device(dmac->dev); + char pdev_irqname[5]; + char *irqname; + int ret; + + uchan->index = index; + uchan->iomem = dmac->iomem + USB_DMAC_CHAN_OFFSET(index); + + /* Request the channel interrupt. */ + sprintf(pdev_irqname, "ch%u", index); + uchan->irq = platform_get_irq_byname(pdev, pdev_irqname); + if (uchan->irq < 0) { + dev_err(dmac->dev, "no IRQ specified for channel %u\n", index); + return -ENODEV; + } + + irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:%u", + dev_name(dmac->dev), index); + if (!irqname) + return -ENOMEM; + + ret = devm_request_irq(dmac->dev, uchan->irq, usb_dmac_isr_channel, + IRQF_SHARED, irqname, uchan); + if (ret) { + dev_err(dmac->dev, "failed to request IRQ %u (%d)\n", + uchan->irq, ret); + return ret; + } + + uchan->vc.desc_free = usb_dmac_virt_desc_free; + vchan_init(&uchan->vc, &dmac->engine); + INIT_LIST_HEAD(&uchan->desc_freed); + INIT_LIST_HEAD(&uchan->desc_got); + + return 0; +} + +static int usb_dmac_parse_of(struct device *dev, struct usb_dmac *dmac) +{ + struct device_node *np = dev->of_node; + int ret; + + ret = of_property_read_u32(np, "dma-channels", &dmac->n_channels); + if (ret < 0) { + dev_err(dev, "unable to read dma-channels property\n"); + return ret; + } + + if (dmac->n_channels <= 0 || dmac->n_channels >= 100) { + dev_err(dev, "invalid number of channels %u\n", + dmac->n_channels); + return -EINVAL; + } + + return 0; +} + +static int usb_dmac_probe(struct platform_device *pdev) +{ + const enum dma_slave_buswidth widths = USB_DMAC_SLAVE_BUSWIDTH; + struct dma_device *engine; + struct usb_dmac *dmac; + struct resource *mem; + unsigned int i; + int ret; + + dmac = devm_kzalloc(&pdev->dev, sizeof(*dmac), GFP_KERNEL); + if (!dmac) + return -ENOMEM; + + dmac->dev = &pdev->dev; + platform_set_drvdata(pdev, dmac); + + ret = usb_dmac_parse_of(&pdev->dev, dmac); + if (ret < 0) + return ret; + + dmac->channels = devm_kcalloc(&pdev->dev, dmac->n_channels, + sizeof(*dmac->channels), GFP_KERNEL); + if (!dmac->channels) + return -ENOMEM; + + /* Request resources. */ + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + dmac->iomem = devm_ioremap_resource(&pdev->dev, mem); + if (IS_ERR(dmac->iomem)) + return PTR_ERR(dmac->iomem); + + /* Enable runtime PM and initialize the device. */ + pm_runtime_enable(&pdev->dev); + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "runtime PM get sync failed (%d)\n", ret); + return ret; + } + + ret = usb_dmac_init(dmac); + pm_runtime_put(&pdev->dev); + + if (ret) { + dev_err(&pdev->dev, "failed to reset device\n"); + goto error; + } + + /* Initialize the channels. */ + INIT_LIST_HEAD(&dmac->engine.channels); + + for (i = 0; i < dmac->n_channels; ++i) { + ret = usb_dmac_chan_probe(dmac, &dmac->channels[i], i); + if (ret < 0) + goto error; + } + + /* Register the DMAC as a DMA provider for DT. */ + ret = of_dma_controller_register(pdev->dev.of_node, usb_dmac_of_xlate, + NULL); + if (ret < 0) + goto error; + + /* + * Register the DMA engine device. + * + * Default transfer size of 32 bytes requires 32-byte alignment. + */ + engine = &dmac->engine; + dma_cap_set(DMA_SLAVE, engine->cap_mask); + + engine->dev = &pdev->dev; + + engine->src_addr_widths = widths; + engine->dst_addr_widths = widths; + engine->directions = BIT(DMA_MEM_TO_DEV) | BIT(DMA_DEV_TO_MEM); + engine->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + engine->device_alloc_chan_resources = usb_dmac_alloc_chan_resources; + engine->device_free_chan_resources = usb_dmac_free_chan_resources; + engine->device_prep_slave_sg = usb_dmac_prep_slave_sg; + engine->device_terminate_all = usb_dmac_chan_terminate_all; + engine->device_tx_status = usb_dmac_tx_status; + engine->device_issue_pending = usb_dmac_issue_pending; + + ret = dma_async_device_register(engine); + if (ret < 0) + goto error; + + return 0; + +error: + of_dma_controller_free(pdev->dev.of_node); + pm_runtime_disable(&pdev->dev); + return ret; +} + +static void usb_dmac_chan_remove(struct usb_dmac *dmac, + struct usb_dmac_chan *uchan) +{ + usb_dmac_chan_halt(uchan); + devm_free_irq(dmac->dev, uchan->irq, uchan); +} + +static int usb_dmac_remove(struct platform_device *pdev) +{ + struct usb_dmac *dmac = platform_get_drvdata(pdev); + int i; + + for (i = 0; i < dmac->n_channels; ++i) + usb_dmac_chan_remove(dmac, &dmac->channels[i]); + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&dmac->engine); + + pm_runtime_disable(&pdev->dev); + + return 0; +} + +static void usb_dmac_shutdown(struct platform_device *pdev) +{ + struct usb_dmac *dmac = platform_get_drvdata(pdev); + + usb_dmac_stop(dmac); +} + +static const struct of_device_id usb_dmac_of_ids[] = { + { .compatible = "renesas,usb-dmac", }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, usb_dmac_of_ids); + +static struct platform_driver usb_dmac_driver = { + .driver = { + .pm = &usb_dmac_pm, + .name = "usb-dmac", + .of_match_table = usb_dmac_of_ids, + }, + .probe = usb_dmac_probe, + .remove = usb_dmac_remove, + .shutdown = usb_dmac_shutdown, +}; + +module_platform_driver(usb_dmac_driver); + +MODULE_DESCRIPTION("Renesas USB DMA Controller Driver"); +MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/sirf-dma.c b/drivers/dma/sirf-dma.c new file mode 100644 index 000000000..a1afda43b --- /dev/null +++ b/drivers/dma/sirf-dma.c @@ -0,0 +1,931 @@ +/* + * DMA controller driver for CSR SiRFprimaII + * + * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company. + * + * Licensed under GPLv2 or later. + */ + +#include <linux/module.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/pm_runtime.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <linux/clk.h> +#include <linux/of_dma.h> +#include <linux/sirfsoc_dma.h> + +#include "dmaengine.h" + +#define SIRFSOC_DMA_DESCRIPTORS 16 +#define SIRFSOC_DMA_CHANNELS 16 + +#define SIRFSOC_DMA_CH_ADDR 0x00 +#define SIRFSOC_DMA_CH_XLEN 0x04 +#define SIRFSOC_DMA_CH_YLEN 0x08 +#define SIRFSOC_DMA_CH_CTRL 0x0C + +#define SIRFSOC_DMA_WIDTH_0 0x100 +#define SIRFSOC_DMA_CH_VALID 0x140 +#define SIRFSOC_DMA_CH_INT 0x144 +#define SIRFSOC_DMA_INT_EN 0x148 +#define SIRFSOC_DMA_INT_EN_CLR 0x14C +#define SIRFSOC_DMA_CH_LOOP_CTRL 0x150 +#define SIRFSOC_DMA_CH_LOOP_CTRL_CLR 0x15C + +#define SIRFSOC_DMA_MODE_CTRL_BIT 4 +#define SIRFSOC_DMA_DIR_CTRL_BIT 5 + +/* xlen and dma_width register is in 4 bytes boundary */ +#define SIRFSOC_DMA_WORD_LEN 4 + +struct sirfsoc_dma_desc { + struct dma_async_tx_descriptor desc; + struct list_head node; + + /* SiRFprimaII 2D-DMA parameters */ + + int xlen; /* DMA xlen */ + int ylen; /* DMA ylen */ + int width; /* DMA width */ + int dir; + bool cyclic; /* is loop DMA? */ + u32 addr; /* DMA buffer address */ +}; + +struct sirfsoc_dma_chan { + struct dma_chan chan; + struct list_head free; + struct list_head prepared; + struct list_head queued; + struct list_head active; + struct list_head completed; + unsigned long happened_cyclic; + unsigned long completed_cyclic; + + /* Lock for this structure */ + spinlock_t lock; + + int mode; +}; + +struct sirfsoc_dma_regs { + u32 ctrl[SIRFSOC_DMA_CHANNELS]; + u32 interrupt_en; +}; + +struct sirfsoc_dma { + struct dma_device dma; + struct tasklet_struct tasklet; + struct sirfsoc_dma_chan channels[SIRFSOC_DMA_CHANNELS]; + void __iomem *base; + int irq; + struct clk *clk; + bool is_marco; + struct sirfsoc_dma_regs regs_save; +}; + +#define DRV_NAME "sirfsoc_dma" + +static int sirfsoc_dma_runtime_suspend(struct device *dev); + +/* Convert struct dma_chan to struct sirfsoc_dma_chan */ +static inline +struct sirfsoc_dma_chan *dma_chan_to_sirfsoc_dma_chan(struct dma_chan *c) +{ + return container_of(c, struct sirfsoc_dma_chan, chan); +} + +/* Convert struct dma_chan to struct sirfsoc_dma */ +static inline struct sirfsoc_dma *dma_chan_to_sirfsoc_dma(struct dma_chan *c) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(c); + return container_of(schan, struct sirfsoc_dma, channels[c->chan_id]); +} + +/* Execute all queued DMA descriptors */ +static void sirfsoc_dma_execute(struct sirfsoc_dma_chan *schan) +{ + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan); + int cid = schan->chan.chan_id; + struct sirfsoc_dma_desc *sdesc = NULL; + + /* + * lock has been held by functions calling this, so we don't hold + * lock again + */ + + sdesc = list_first_entry(&schan->queued, struct sirfsoc_dma_desc, + node); + /* Move the first queued descriptor to active list */ + list_move_tail(&sdesc->node, &schan->active); + + /* Start the DMA transfer */ + writel_relaxed(sdesc->width, sdma->base + SIRFSOC_DMA_WIDTH_0 + + cid * 4); + writel_relaxed(cid | (schan->mode << SIRFSOC_DMA_MODE_CTRL_BIT) | + (sdesc->dir << SIRFSOC_DMA_DIR_CTRL_BIT), + sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_CTRL); + writel_relaxed(sdesc->xlen, sdma->base + cid * 0x10 + + SIRFSOC_DMA_CH_XLEN); + writel_relaxed(sdesc->ylen, sdma->base + cid * 0x10 + + SIRFSOC_DMA_CH_YLEN); + writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_INT_EN) | + (1 << cid), sdma->base + SIRFSOC_DMA_INT_EN); + + /* + * writel has an implict memory write barrier to make sure data is + * flushed into memory before starting DMA + */ + writel(sdesc->addr >> 2, sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR); + + if (sdesc->cyclic) { + writel((1 << cid) | 1 << (cid + 16) | + readl_relaxed(sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL), + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL); + schan->happened_cyclic = schan->completed_cyclic = 0; + } +} + +/* Interrupt handler */ +static irqreturn_t sirfsoc_dma_irq(int irq, void *data) +{ + struct sirfsoc_dma *sdma = data; + struct sirfsoc_dma_chan *schan; + struct sirfsoc_dma_desc *sdesc = NULL; + u32 is; + int ch; + + is = readl(sdma->base + SIRFSOC_DMA_CH_INT); + while ((ch = fls(is) - 1) >= 0) { + is &= ~(1 << ch); + writel_relaxed(1 << ch, sdma->base + SIRFSOC_DMA_CH_INT); + schan = &sdma->channels[ch]; + + spin_lock(&schan->lock); + + sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc, + node); + if (!sdesc->cyclic) { + /* Execute queued descriptors */ + list_splice_tail_init(&schan->active, &schan->completed); + if (!list_empty(&schan->queued)) + sirfsoc_dma_execute(schan); + } else + schan->happened_cyclic++; + + spin_unlock(&schan->lock); + } + + /* Schedule tasklet */ + tasklet_schedule(&sdma->tasklet); + + return IRQ_HANDLED; +} + +/* process completed descriptors */ +static void sirfsoc_dma_process_completed(struct sirfsoc_dma *sdma) +{ + dma_cookie_t last_cookie = 0; + struct sirfsoc_dma_chan *schan; + struct sirfsoc_dma_desc *sdesc; + struct dma_async_tx_descriptor *desc; + unsigned long flags; + unsigned long happened_cyclic; + LIST_HEAD(list); + int i; + + for (i = 0; i < sdma->dma.chancnt; i++) { + schan = &sdma->channels[i]; + + /* Get all completed descriptors */ + spin_lock_irqsave(&schan->lock, flags); + if (!list_empty(&schan->completed)) { + list_splice_tail_init(&schan->completed, &list); + spin_unlock_irqrestore(&schan->lock, flags); + + /* Execute callbacks and run dependencies */ + list_for_each_entry(sdesc, &list, node) { + desc = &sdesc->desc; + + if (desc->callback) + desc->callback(desc->callback_param); + + last_cookie = desc->cookie; + dma_run_dependencies(desc); + } + + /* Free descriptors */ + spin_lock_irqsave(&schan->lock, flags); + list_splice_tail_init(&list, &schan->free); + schan->chan.completed_cookie = last_cookie; + spin_unlock_irqrestore(&schan->lock, flags); + } else { + /* for cyclic channel, desc is always in active list */ + sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc, + node); + + if (!sdesc || (sdesc && !sdesc->cyclic)) { + /* without active cyclic DMA */ + spin_unlock_irqrestore(&schan->lock, flags); + continue; + } + + /* cyclic DMA */ + happened_cyclic = schan->happened_cyclic; + spin_unlock_irqrestore(&schan->lock, flags); + + desc = &sdesc->desc; + while (happened_cyclic != schan->completed_cyclic) { + if (desc->callback) + desc->callback(desc->callback_param); + schan->completed_cyclic++; + } + } + } +} + +/* DMA Tasklet */ +static void sirfsoc_dma_tasklet(unsigned long data) +{ + struct sirfsoc_dma *sdma = (void *)data; + + sirfsoc_dma_process_completed(sdma); +} + +/* Submit descriptor to hardware */ +static dma_cookie_t sirfsoc_dma_tx_submit(struct dma_async_tx_descriptor *txd) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(txd->chan); + struct sirfsoc_dma_desc *sdesc; + unsigned long flags; + dma_cookie_t cookie; + + sdesc = container_of(txd, struct sirfsoc_dma_desc, desc); + + spin_lock_irqsave(&schan->lock, flags); + + /* Move descriptor to queue */ + list_move_tail(&sdesc->node, &schan->queued); + + cookie = dma_cookie_assign(txd); + + spin_unlock_irqrestore(&schan->lock, flags); + + return cookie; +} + +static int sirfsoc_dma_slave_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + unsigned long flags; + + if ((config->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) || + (config->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES)) + return -EINVAL; + + spin_lock_irqsave(&schan->lock, flags); + schan->mode = (config->src_maxburst == 4 ? 1 : 0); + spin_unlock_irqrestore(&schan->lock, flags); + + return 0; +} + +static int sirfsoc_dma_terminate_all(struct dma_chan *chan) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan); + int cid = schan->chan.chan_id; + unsigned long flags; + + spin_lock_irqsave(&schan->lock, flags); + + if (!sdma->is_marco) { + writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_INT_EN) & + ~(1 << cid), sdma->base + SIRFSOC_DMA_INT_EN); + writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL) + & ~((1 << cid) | 1 << (cid + 16)), + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL); + } else { + writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_INT_EN_CLR); + writel_relaxed((1 << cid) | 1 << (cid + 16), + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL_CLR); + } + + writel_relaxed(1 << cid, sdma->base + SIRFSOC_DMA_CH_VALID); + + list_splice_tail_init(&schan->active, &schan->free); + list_splice_tail_init(&schan->queued, &schan->free); + + spin_unlock_irqrestore(&schan->lock, flags); + + return 0; +} + +static int sirfsoc_dma_pause_chan(struct dma_chan *chan) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan); + int cid = schan->chan.chan_id; + unsigned long flags; + + spin_lock_irqsave(&schan->lock, flags); + + if (!sdma->is_marco) + writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL) + & ~((1 << cid) | 1 << (cid + 16)), + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL); + else + writel_relaxed((1 << cid) | 1 << (cid + 16), + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL_CLR); + + spin_unlock_irqrestore(&schan->lock, flags); + + return 0; +} + +static int sirfsoc_dma_resume_chan(struct dma_chan *chan) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(&schan->chan); + int cid = schan->chan.chan_id; + unsigned long flags; + + spin_lock_irqsave(&schan->lock, flags); + + if (!sdma->is_marco) + writel_relaxed(readl_relaxed(sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL) + | ((1 << cid) | 1 << (cid + 16)), + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL); + else + writel_relaxed((1 << cid) | 1 << (cid + 16), + sdma->base + SIRFSOC_DMA_CH_LOOP_CTRL); + + spin_unlock_irqrestore(&schan->lock, flags); + + return 0; +} + +/* Alloc channel resources */ +static int sirfsoc_dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan); + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + struct sirfsoc_dma_desc *sdesc; + unsigned long flags; + LIST_HEAD(descs); + int i; + + pm_runtime_get_sync(sdma->dma.dev); + + /* Alloc descriptors for this channel */ + for (i = 0; i < SIRFSOC_DMA_DESCRIPTORS; i++) { + sdesc = kzalloc(sizeof(*sdesc), GFP_KERNEL); + if (!sdesc) { + dev_notice(sdma->dma.dev, "Memory allocation error. " + "Allocated only %u descriptors\n", i); + break; + } + + dma_async_tx_descriptor_init(&sdesc->desc, chan); + sdesc->desc.flags = DMA_CTRL_ACK; + sdesc->desc.tx_submit = sirfsoc_dma_tx_submit; + + list_add_tail(&sdesc->node, &descs); + } + + /* Return error only if no descriptors were allocated */ + if (i == 0) + return -ENOMEM; + + spin_lock_irqsave(&schan->lock, flags); + + list_splice_tail_init(&descs, &schan->free); + spin_unlock_irqrestore(&schan->lock, flags); + + return i; +} + +/* Free channel resources */ +static void sirfsoc_dma_free_chan_resources(struct dma_chan *chan) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan); + struct sirfsoc_dma_desc *sdesc, *tmp; + unsigned long flags; + LIST_HEAD(descs); + + spin_lock_irqsave(&schan->lock, flags); + + /* Channel must be idle */ + BUG_ON(!list_empty(&schan->prepared)); + BUG_ON(!list_empty(&schan->queued)); + BUG_ON(!list_empty(&schan->active)); + BUG_ON(!list_empty(&schan->completed)); + + /* Move data */ + list_splice_tail_init(&schan->free, &descs); + + spin_unlock_irqrestore(&schan->lock, flags); + + /* Free descriptors */ + list_for_each_entry_safe(sdesc, tmp, &descs, node) + kfree(sdesc); + + pm_runtime_put(sdma->dma.dev); +} + +/* Send pending descriptor to hardware */ +static void sirfsoc_dma_issue_pending(struct dma_chan *chan) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&schan->lock, flags); + + if (list_empty(&schan->active) && !list_empty(&schan->queued)) + sirfsoc_dma_execute(schan); + + spin_unlock_irqrestore(&schan->lock, flags); +} + +/* Check request completion status */ +static enum dma_status +sirfsoc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan); + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + unsigned long flags; + enum dma_status ret; + struct sirfsoc_dma_desc *sdesc; + int cid = schan->chan.chan_id; + unsigned long dma_pos; + unsigned long dma_request_bytes; + unsigned long residue; + + spin_lock_irqsave(&schan->lock, flags); + + sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc, + node); + dma_request_bytes = (sdesc->xlen + 1) * (sdesc->ylen + 1) * + (sdesc->width * SIRFSOC_DMA_WORD_LEN); + + ret = dma_cookie_status(chan, cookie, txstate); + dma_pos = readl_relaxed(sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR) + << 2; + residue = dma_request_bytes - (dma_pos - sdesc->addr); + dma_set_residue(txstate, residue); + + spin_unlock_irqrestore(&schan->lock, flags); + + return ret; +} + +static struct dma_async_tx_descriptor *sirfsoc_dma_prep_interleaved( + struct dma_chan *chan, struct dma_interleaved_template *xt, + unsigned long flags) +{ + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan); + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + struct sirfsoc_dma_desc *sdesc = NULL; + unsigned long iflags; + int ret; + + if ((xt->dir != DMA_MEM_TO_DEV) && (xt->dir != DMA_DEV_TO_MEM)) { + ret = -EINVAL; + goto err_dir; + } + + /* Get free descriptor */ + spin_lock_irqsave(&schan->lock, iflags); + if (!list_empty(&schan->free)) { + sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc, + node); + list_del(&sdesc->node); + } + spin_unlock_irqrestore(&schan->lock, iflags); + + if (!sdesc) { + /* try to free completed descriptors */ + sirfsoc_dma_process_completed(sdma); + ret = 0; + goto no_desc; + } + + /* Place descriptor in prepared list */ + spin_lock_irqsave(&schan->lock, iflags); + + /* + * Number of chunks in a frame can only be 1 for prima2 + * and ylen (number of frame - 1) must be at least 0 + */ + if ((xt->frame_size == 1) && (xt->numf > 0)) { + sdesc->cyclic = 0; + sdesc->xlen = xt->sgl[0].size / SIRFSOC_DMA_WORD_LEN; + sdesc->width = (xt->sgl[0].size + xt->sgl[0].icg) / + SIRFSOC_DMA_WORD_LEN; + sdesc->ylen = xt->numf - 1; + if (xt->dir == DMA_MEM_TO_DEV) { + sdesc->addr = xt->src_start; + sdesc->dir = 1; + } else { + sdesc->addr = xt->dst_start; + sdesc->dir = 0; + } + + list_add_tail(&sdesc->node, &schan->prepared); + } else { + pr_err("sirfsoc DMA Invalid xfer\n"); + ret = -EINVAL; + goto err_xfer; + } + spin_unlock_irqrestore(&schan->lock, iflags); + + return &sdesc->desc; +err_xfer: + spin_unlock_irqrestore(&schan->lock, iflags); +no_desc: +err_dir: + return ERR_PTR(ret); +} + +static struct dma_async_tx_descriptor * +sirfsoc_dma_prep_cyclic(struct dma_chan *chan, dma_addr_t addr, + size_t buf_len, size_t period_len, + enum dma_transfer_direction direction, unsigned long flags) +{ + struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); + struct sirfsoc_dma_desc *sdesc = NULL; + unsigned long iflags; + + /* + * we only support cycle transfer with 2 period + * If the X-length is set to 0, it would be the loop mode. + * The DMA address keeps increasing until reaching the end of a loop + * area whose size is defined by (DMA_WIDTH x (Y_LENGTH + 1)). Then + * the DMA address goes back to the beginning of this area. + * In loop mode, the DMA data region is divided into two parts, BUFA + * and BUFB. DMA controller generates interrupts twice in each loop: + * when the DMA address reaches the end of BUFA or the end of the + * BUFB + */ + if (buf_len != 2 * period_len) + return ERR_PTR(-EINVAL); + + /* Get free descriptor */ + spin_lock_irqsave(&schan->lock, iflags); + if (!list_empty(&schan->free)) { + sdesc = list_first_entry(&schan->free, struct sirfsoc_dma_desc, + node); + list_del(&sdesc->node); + } + spin_unlock_irqrestore(&schan->lock, iflags); + + if (!sdesc) + return NULL; + + /* Place descriptor in prepared list */ + spin_lock_irqsave(&schan->lock, iflags); + sdesc->addr = addr; + sdesc->cyclic = 1; + sdesc->xlen = 0; + sdesc->ylen = buf_len / SIRFSOC_DMA_WORD_LEN - 1; + sdesc->width = 1; + list_add_tail(&sdesc->node, &schan->prepared); + spin_unlock_irqrestore(&schan->lock, iflags); + + return &sdesc->desc; +} + +/* + * The DMA controller consists of 16 independent DMA channels. + * Each channel is allocated to a different function + */ +bool sirfsoc_dma_filter_id(struct dma_chan *chan, void *chan_id) +{ + unsigned int ch_nr = (unsigned int) chan_id; + + if (ch_nr == chan->chan_id + + chan->device->dev_id * SIRFSOC_DMA_CHANNELS) + return true; + + return false; +} +EXPORT_SYMBOL(sirfsoc_dma_filter_id); + +#define SIRFSOC_DMA_BUSWIDTHS \ + (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) + +static struct dma_chan *of_dma_sirfsoc_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct sirfsoc_dma *sdma = ofdma->of_dma_data; + unsigned int request = dma_spec->args[0]; + + if (request >= SIRFSOC_DMA_CHANNELS) + return NULL; + + return dma_get_slave_channel(&sdma->channels[request].chan); +} + +static int sirfsoc_dma_probe(struct platform_device *op) +{ + struct device_node *dn = op->dev.of_node; + struct device *dev = &op->dev; + struct dma_device *dma; + struct sirfsoc_dma *sdma; + struct sirfsoc_dma_chan *schan; + struct resource res; + ulong regs_start, regs_size; + u32 id; + int ret, i; + + sdma = devm_kzalloc(dev, sizeof(*sdma), GFP_KERNEL); + if (!sdma) { + dev_err(dev, "Memory exhausted!\n"); + return -ENOMEM; + } + + if (of_device_is_compatible(dn, "sirf,marco-dmac")) + sdma->is_marco = true; + + if (of_property_read_u32(dn, "cell-index", &id)) { + dev_err(dev, "Fail to get DMAC index\n"); + return -ENODEV; + } + + sdma->irq = irq_of_parse_and_map(dn, 0); + if (sdma->irq == NO_IRQ) { + dev_err(dev, "Error mapping IRQ!\n"); + return -EINVAL; + } + + sdma->clk = devm_clk_get(dev, NULL); + if (IS_ERR(sdma->clk)) { + dev_err(dev, "failed to get a clock.\n"); + return PTR_ERR(sdma->clk); + } + + ret = of_address_to_resource(dn, 0, &res); + if (ret) { + dev_err(dev, "Error parsing memory region!\n"); + goto irq_dispose; + } + + regs_start = res.start; + regs_size = resource_size(&res); + + sdma->base = devm_ioremap(dev, regs_start, regs_size); + if (!sdma->base) { + dev_err(dev, "Error mapping memory region!\n"); + ret = -ENOMEM; + goto irq_dispose; + } + + ret = request_irq(sdma->irq, &sirfsoc_dma_irq, 0, DRV_NAME, sdma); + if (ret) { + dev_err(dev, "Error requesting IRQ!\n"); + ret = -EINVAL; + goto irq_dispose; + } + + dma = &sdma->dma; + dma->dev = dev; + + dma->device_alloc_chan_resources = sirfsoc_dma_alloc_chan_resources; + dma->device_free_chan_resources = sirfsoc_dma_free_chan_resources; + dma->device_issue_pending = sirfsoc_dma_issue_pending; + dma->device_config = sirfsoc_dma_slave_config; + dma->device_pause = sirfsoc_dma_pause_chan; + dma->device_resume = sirfsoc_dma_resume_chan; + dma->device_terminate_all = sirfsoc_dma_terminate_all; + dma->device_tx_status = sirfsoc_dma_tx_status; + dma->device_prep_interleaved_dma = sirfsoc_dma_prep_interleaved; + dma->device_prep_dma_cyclic = sirfsoc_dma_prep_cyclic; + dma->src_addr_widths = SIRFSOC_DMA_BUSWIDTHS; + dma->dst_addr_widths = SIRFSOC_DMA_BUSWIDTHS; + dma->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + + INIT_LIST_HEAD(&dma->channels); + dma_cap_set(DMA_SLAVE, dma->cap_mask); + dma_cap_set(DMA_CYCLIC, dma->cap_mask); + dma_cap_set(DMA_INTERLEAVE, dma->cap_mask); + dma_cap_set(DMA_PRIVATE, dma->cap_mask); + + for (i = 0; i < SIRFSOC_DMA_CHANNELS; i++) { + schan = &sdma->channels[i]; + + schan->chan.device = dma; + dma_cookie_init(&schan->chan); + + INIT_LIST_HEAD(&schan->free); + INIT_LIST_HEAD(&schan->prepared); + INIT_LIST_HEAD(&schan->queued); + INIT_LIST_HEAD(&schan->active); + INIT_LIST_HEAD(&schan->completed); + + spin_lock_init(&schan->lock); + list_add_tail(&schan->chan.device_node, &dma->channels); + } + + tasklet_init(&sdma->tasklet, sirfsoc_dma_tasklet, (unsigned long)sdma); + + /* Register DMA engine */ + dev_set_drvdata(dev, sdma); + + ret = dma_async_device_register(dma); + if (ret) + goto free_irq; + + /* Device-tree DMA controller registration */ + ret = of_dma_controller_register(dn, of_dma_sirfsoc_xlate, sdma); + if (ret) { + dev_err(dev, "failed to register DMA controller\n"); + goto unreg_dma_dev; + } + + pm_runtime_enable(&op->dev); + dev_info(dev, "initialized SIRFSOC DMAC driver\n"); + + return 0; + +unreg_dma_dev: + dma_async_device_unregister(dma); +free_irq: + free_irq(sdma->irq, sdma); +irq_dispose: + irq_dispose_mapping(sdma->irq); + return ret; +} + +static int sirfsoc_dma_remove(struct platform_device *op) +{ + struct device *dev = &op->dev; + struct sirfsoc_dma *sdma = dev_get_drvdata(dev); + + of_dma_controller_free(op->dev.of_node); + dma_async_device_unregister(&sdma->dma); + free_irq(sdma->irq, sdma); + irq_dispose_mapping(sdma->irq); + pm_runtime_disable(&op->dev); + if (!pm_runtime_status_suspended(&op->dev)) + sirfsoc_dma_runtime_suspend(&op->dev); + + return 0; +} + +static int sirfsoc_dma_runtime_suspend(struct device *dev) +{ + struct sirfsoc_dma *sdma = dev_get_drvdata(dev); + + clk_disable_unprepare(sdma->clk); + return 0; +} + +static int sirfsoc_dma_runtime_resume(struct device *dev) +{ + struct sirfsoc_dma *sdma = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(sdma->clk); + if (ret < 0) { + dev_err(dev, "clk_enable failed: %d\n", ret); + return ret; + } + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int sirfsoc_dma_pm_suspend(struct device *dev) +{ + struct sirfsoc_dma *sdma = dev_get_drvdata(dev); + struct sirfsoc_dma_regs *save = &sdma->regs_save; + struct sirfsoc_dma_desc *sdesc; + struct sirfsoc_dma_chan *schan; + int ch; + int ret; + + /* + * if we were runtime-suspended before, resume to enable clock + * before accessing register + */ + if (pm_runtime_status_suspended(dev)) { + ret = sirfsoc_dma_runtime_resume(dev); + if (ret < 0) + return ret; + } + + /* + * DMA controller will lose all registers while suspending + * so we need to save registers for active channels + */ + for (ch = 0; ch < SIRFSOC_DMA_CHANNELS; ch++) { + schan = &sdma->channels[ch]; + if (list_empty(&schan->active)) + continue; + sdesc = list_first_entry(&schan->active, + struct sirfsoc_dma_desc, + node); + save->ctrl[ch] = readl_relaxed(sdma->base + + ch * 0x10 + SIRFSOC_DMA_CH_CTRL); + } + save->interrupt_en = readl_relaxed(sdma->base + SIRFSOC_DMA_INT_EN); + + /* Disable clock */ + sirfsoc_dma_runtime_suspend(dev); + + return 0; +} + +static int sirfsoc_dma_pm_resume(struct device *dev) +{ + struct sirfsoc_dma *sdma = dev_get_drvdata(dev); + struct sirfsoc_dma_regs *save = &sdma->regs_save; + struct sirfsoc_dma_desc *sdesc; + struct sirfsoc_dma_chan *schan; + int ch; + int ret; + + /* Enable clock before accessing register */ + ret = sirfsoc_dma_runtime_resume(dev); + if (ret < 0) + return ret; + + writel_relaxed(save->interrupt_en, sdma->base + SIRFSOC_DMA_INT_EN); + for (ch = 0; ch < SIRFSOC_DMA_CHANNELS; ch++) { + schan = &sdma->channels[ch]; + if (list_empty(&schan->active)) + continue; + sdesc = list_first_entry(&schan->active, + struct sirfsoc_dma_desc, + node); + writel_relaxed(sdesc->width, + sdma->base + SIRFSOC_DMA_WIDTH_0 + ch * 4); + writel_relaxed(sdesc->xlen, + sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_XLEN); + writel_relaxed(sdesc->ylen, + sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_YLEN); + writel_relaxed(save->ctrl[ch], + sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_CTRL); + writel_relaxed(sdesc->addr >> 2, + sdma->base + ch * 0x10 + SIRFSOC_DMA_CH_ADDR); + } + + /* if we were runtime-suspended before, suspend again */ + if (pm_runtime_status_suspended(dev)) + sirfsoc_dma_runtime_suspend(dev); + + return 0; +} +#endif + +static const struct dev_pm_ops sirfsoc_dma_pm_ops = { + SET_RUNTIME_PM_OPS(sirfsoc_dma_runtime_suspend, sirfsoc_dma_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(sirfsoc_dma_pm_suspend, sirfsoc_dma_pm_resume) +}; + +static const struct of_device_id sirfsoc_dma_match[] = { + { .compatible = "sirf,prima2-dmac", }, + { .compatible = "sirf,marco-dmac", }, + {}, +}; + +static struct platform_driver sirfsoc_dma_driver = { + .probe = sirfsoc_dma_probe, + .remove = sirfsoc_dma_remove, + .driver = { + .name = DRV_NAME, + .pm = &sirfsoc_dma_pm_ops, + .of_match_table = sirfsoc_dma_match, + }, +}; + +static __init int sirfsoc_dma_init(void) +{ + return platform_driver_register(&sirfsoc_dma_driver); +} + +static void __exit sirfsoc_dma_exit(void) +{ + platform_driver_unregister(&sirfsoc_dma_driver); +} + +subsys_initcall(sirfsoc_dma_init); +module_exit(sirfsoc_dma_exit); + +MODULE_AUTHOR("Rongjun Ying <rongjun.ying@csr.com>, " + "Barry Song <baohua.song@csr.com>"); +MODULE_DESCRIPTION("SIRFSOC DMA control driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c new file mode 100644 index 000000000..3c10f034d --- /dev/null +++ b/drivers/dma/ste_dma40.c @@ -0,0 +1,3762 @@ +/* + * Copyright (C) Ericsson AB 2007-2008 + * Copyright (C) ST-Ericsson SA 2008-2010 + * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson + * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/dma-mapping.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/dmaengine.h> +#include <linux/platform_device.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/log2.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/err.h> +#include <linux/of.h> +#include <linux/of_dma.h> +#include <linux/amba/bus.h> +#include <linux/regulator/consumer.h> +#include <linux/platform_data/dma-ste-dma40.h> + +#include "dmaengine.h" +#include "ste_dma40_ll.h" + +#define D40_NAME "dma40" + +#define D40_PHY_CHAN -1 + +/* For masking out/in 2 bit channel positions */ +#define D40_CHAN_POS(chan) (2 * (chan / 2)) +#define D40_CHAN_POS_MASK(chan) (0x3 << D40_CHAN_POS(chan)) + +/* Maximum iterations taken before giving up suspending a channel */ +#define D40_SUSPEND_MAX_IT 500 + +/* Milliseconds */ +#define DMA40_AUTOSUSPEND_DELAY 100 + +/* Hardware requirement on LCLA alignment */ +#define LCLA_ALIGNMENT 0x40000 + +/* Max number of links per event group */ +#define D40_LCLA_LINK_PER_EVENT_GRP 128 +#define D40_LCLA_END D40_LCLA_LINK_PER_EVENT_GRP + +/* Max number of logical channels per physical channel */ +#define D40_MAX_LOG_CHAN_PER_PHY 32 + +/* Attempts before giving up to trying to get pages that are aligned */ +#define MAX_LCLA_ALLOC_ATTEMPTS 256 + +/* Bit markings for allocation map */ +#define D40_ALLOC_FREE BIT(31) +#define D40_ALLOC_PHY BIT(30) +#define D40_ALLOC_LOG_FREE 0 + +#define D40_MEMCPY_MAX_CHANS 8 + +/* Reserved event lines for memcpy only. */ +#define DB8500_DMA_MEMCPY_EV_0 51 +#define DB8500_DMA_MEMCPY_EV_1 56 +#define DB8500_DMA_MEMCPY_EV_2 57 +#define DB8500_DMA_MEMCPY_EV_3 58 +#define DB8500_DMA_MEMCPY_EV_4 59 +#define DB8500_DMA_MEMCPY_EV_5 60 + +static int dma40_memcpy_channels[] = { + DB8500_DMA_MEMCPY_EV_0, + DB8500_DMA_MEMCPY_EV_1, + DB8500_DMA_MEMCPY_EV_2, + DB8500_DMA_MEMCPY_EV_3, + DB8500_DMA_MEMCPY_EV_4, + DB8500_DMA_MEMCPY_EV_5, +}; + +/* Default configuration for physcial memcpy */ +static struct stedma40_chan_cfg dma40_memcpy_conf_phy = { + .mode = STEDMA40_MODE_PHYSICAL, + .dir = DMA_MEM_TO_MEM, + + .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE, + .src_info.psize = STEDMA40_PSIZE_PHY_1, + .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL, + + .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE, + .dst_info.psize = STEDMA40_PSIZE_PHY_1, + .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL, +}; + +/* Default configuration for logical memcpy */ +static struct stedma40_chan_cfg dma40_memcpy_conf_log = { + .mode = STEDMA40_MODE_LOGICAL, + .dir = DMA_MEM_TO_MEM, + + .src_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE, + .src_info.psize = STEDMA40_PSIZE_LOG_1, + .src_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL, + + .dst_info.data_width = DMA_SLAVE_BUSWIDTH_1_BYTE, + .dst_info.psize = STEDMA40_PSIZE_LOG_1, + .dst_info.flow_ctrl = STEDMA40_NO_FLOW_CTRL, +}; + +/** + * enum 40_command - The different commands and/or statuses. + * + * @D40_DMA_STOP: DMA channel command STOP or status STOPPED, + * @D40_DMA_RUN: The DMA channel is RUNNING of the command RUN. + * @D40_DMA_SUSPEND_REQ: Request the DMA to SUSPEND as soon as possible. + * @D40_DMA_SUSPENDED: The DMA channel is SUSPENDED. + */ +enum d40_command { + D40_DMA_STOP = 0, + D40_DMA_RUN = 1, + D40_DMA_SUSPEND_REQ = 2, + D40_DMA_SUSPENDED = 3 +}; + +/* + * enum d40_events - The different Event Enables for the event lines. + * + * @D40_DEACTIVATE_EVENTLINE: De-activate Event line, stopping the logical chan. + * @D40_ACTIVATE_EVENTLINE: Activate the Event line, to start a logical chan. + * @D40_SUSPEND_REQ_EVENTLINE: Requesting for suspending a event line. + * @D40_ROUND_EVENTLINE: Status check for event line. + */ + +enum d40_events { + D40_DEACTIVATE_EVENTLINE = 0, + D40_ACTIVATE_EVENTLINE = 1, + D40_SUSPEND_REQ_EVENTLINE = 2, + D40_ROUND_EVENTLINE = 3 +}; + +/* + * These are the registers that has to be saved and later restored + * when the DMA hw is powered off. + * TODO: Add save/restore of D40_DREG_GCC on dma40 v3 or later, if that works. + */ +static u32 d40_backup_regs[] = { + D40_DREG_LCPA, + D40_DREG_LCLA, + D40_DREG_PRMSE, + D40_DREG_PRMSO, + D40_DREG_PRMOE, + D40_DREG_PRMOO, +}; + +#define BACKUP_REGS_SZ ARRAY_SIZE(d40_backup_regs) + +/* + * since 9540 and 8540 has the same HW revision + * use v4a for 9540 or ealier + * use v4b for 8540 or later + * HW revision: + * DB8500ed has revision 0 + * DB8500v1 has revision 2 + * DB8500v2 has revision 3 + * AP9540v1 has revision 4 + * DB8540v1 has revision 4 + * TODO: Check if all these registers have to be saved/restored on dma40 v4a + */ +static u32 d40_backup_regs_v4a[] = { + D40_DREG_PSEG1, + D40_DREG_PSEG2, + D40_DREG_PSEG3, + D40_DREG_PSEG4, + D40_DREG_PCEG1, + D40_DREG_PCEG2, + D40_DREG_PCEG3, + D40_DREG_PCEG4, + D40_DREG_RSEG1, + D40_DREG_RSEG2, + D40_DREG_RSEG3, + D40_DREG_RSEG4, + D40_DREG_RCEG1, + D40_DREG_RCEG2, + D40_DREG_RCEG3, + D40_DREG_RCEG4, +}; + +#define BACKUP_REGS_SZ_V4A ARRAY_SIZE(d40_backup_regs_v4a) + +static u32 d40_backup_regs_v4b[] = { + D40_DREG_CPSEG1, + D40_DREG_CPSEG2, + D40_DREG_CPSEG3, + D40_DREG_CPSEG4, + D40_DREG_CPSEG5, + D40_DREG_CPCEG1, + D40_DREG_CPCEG2, + D40_DREG_CPCEG3, + D40_DREG_CPCEG4, + D40_DREG_CPCEG5, + D40_DREG_CRSEG1, + D40_DREG_CRSEG2, + D40_DREG_CRSEG3, + D40_DREG_CRSEG4, + D40_DREG_CRSEG5, + D40_DREG_CRCEG1, + D40_DREG_CRCEG2, + D40_DREG_CRCEG3, + D40_DREG_CRCEG4, + D40_DREG_CRCEG5, +}; + +#define BACKUP_REGS_SZ_V4B ARRAY_SIZE(d40_backup_regs_v4b) + +static u32 d40_backup_regs_chan[] = { + D40_CHAN_REG_SSCFG, + D40_CHAN_REG_SSELT, + D40_CHAN_REG_SSPTR, + D40_CHAN_REG_SSLNK, + D40_CHAN_REG_SDCFG, + D40_CHAN_REG_SDELT, + D40_CHAN_REG_SDPTR, + D40_CHAN_REG_SDLNK, +}; + +#define BACKUP_REGS_SZ_MAX ((BACKUP_REGS_SZ_V4A > BACKUP_REGS_SZ_V4B) ? \ + BACKUP_REGS_SZ_V4A : BACKUP_REGS_SZ_V4B) + +/** + * struct d40_interrupt_lookup - lookup table for interrupt handler + * + * @src: Interrupt mask register. + * @clr: Interrupt clear register. + * @is_error: true if this is an error interrupt. + * @offset: start delta in the lookup_log_chans in d40_base. If equals to + * D40_PHY_CHAN, the lookup_phy_chans shall be used instead. + */ +struct d40_interrupt_lookup { + u32 src; + u32 clr; + bool is_error; + int offset; +}; + + +static struct d40_interrupt_lookup il_v4a[] = { + {D40_DREG_LCTIS0, D40_DREG_LCICR0, false, 0}, + {D40_DREG_LCTIS1, D40_DREG_LCICR1, false, 32}, + {D40_DREG_LCTIS2, D40_DREG_LCICR2, false, 64}, + {D40_DREG_LCTIS3, D40_DREG_LCICR3, false, 96}, + {D40_DREG_LCEIS0, D40_DREG_LCICR0, true, 0}, + {D40_DREG_LCEIS1, D40_DREG_LCICR1, true, 32}, + {D40_DREG_LCEIS2, D40_DREG_LCICR2, true, 64}, + {D40_DREG_LCEIS3, D40_DREG_LCICR3, true, 96}, + {D40_DREG_PCTIS, D40_DREG_PCICR, false, D40_PHY_CHAN}, + {D40_DREG_PCEIS, D40_DREG_PCICR, true, D40_PHY_CHAN}, +}; + +static struct d40_interrupt_lookup il_v4b[] = { + {D40_DREG_CLCTIS1, D40_DREG_CLCICR1, false, 0}, + {D40_DREG_CLCTIS2, D40_DREG_CLCICR2, false, 32}, + {D40_DREG_CLCTIS3, D40_DREG_CLCICR3, false, 64}, + {D40_DREG_CLCTIS4, D40_DREG_CLCICR4, false, 96}, + {D40_DREG_CLCTIS5, D40_DREG_CLCICR5, false, 128}, + {D40_DREG_CLCEIS1, D40_DREG_CLCICR1, true, 0}, + {D40_DREG_CLCEIS2, D40_DREG_CLCICR2, true, 32}, + {D40_DREG_CLCEIS3, D40_DREG_CLCICR3, true, 64}, + {D40_DREG_CLCEIS4, D40_DREG_CLCICR4, true, 96}, + {D40_DREG_CLCEIS5, D40_DREG_CLCICR5, true, 128}, + {D40_DREG_CPCTIS, D40_DREG_CPCICR, false, D40_PHY_CHAN}, + {D40_DREG_CPCEIS, D40_DREG_CPCICR, true, D40_PHY_CHAN}, +}; + +/** + * struct d40_reg_val - simple lookup struct + * + * @reg: The register. + * @val: The value that belongs to the register in reg. + */ +struct d40_reg_val { + unsigned int reg; + unsigned int val; +}; + +static __initdata struct d40_reg_val dma_init_reg_v4a[] = { + /* Clock every part of the DMA block from start */ + { .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL}, + + /* Interrupts on all logical channels */ + { .reg = D40_DREG_LCMIS0, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCMIS1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCMIS2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCMIS3, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR0, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCICR3, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS0, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_LCTIS3, .val = 0xFFFFFFFF} +}; +static __initdata struct d40_reg_val dma_init_reg_v4b[] = { + /* Clock every part of the DMA block from start */ + { .reg = D40_DREG_GCC, .val = D40_DREG_GCC_ENABLE_ALL}, + + /* Interrupts on all logical channels */ + { .reg = D40_DREG_CLCMIS1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCMIS2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCMIS3, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCMIS4, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCMIS5, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCICR1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCICR2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCICR3, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCICR4, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCICR5, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCTIS1, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCTIS2, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCTIS3, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCTIS4, .val = 0xFFFFFFFF}, + { .reg = D40_DREG_CLCTIS5, .val = 0xFFFFFFFF} +}; + +/** + * struct d40_lli_pool - Structure for keeping LLIs in memory + * + * @base: Pointer to memory area when the pre_alloc_lli's are not large + * enough, IE bigger than the most common case, 1 dst and 1 src. NULL if + * pre_alloc_lli is used. + * @dma_addr: DMA address, if mapped + * @size: The size in bytes of the memory at base or the size of pre_alloc_lli. + * @pre_alloc_lli: Pre allocated area for the most common case of transfers, + * one buffer to one buffer. + */ +struct d40_lli_pool { + void *base; + int size; + dma_addr_t dma_addr; + /* Space for dst and src, plus an extra for padding */ + u8 pre_alloc_lli[3 * sizeof(struct d40_phy_lli)]; +}; + +/** + * struct d40_desc - A descriptor is one DMA job. + * + * @lli_phy: LLI settings for physical channel. Both src and dst= + * points into the lli_pool, to base if lli_len > 1 or to pre_alloc_lli if + * lli_len equals one. + * @lli_log: Same as above but for logical channels. + * @lli_pool: The pool with two entries pre-allocated. + * @lli_len: Number of llis of current descriptor. + * @lli_current: Number of transferred llis. + * @lcla_alloc: Number of LCLA entries allocated. + * @txd: DMA engine struct. Used for among other things for communication + * during a transfer. + * @node: List entry. + * @is_in_client_list: true if the client owns this descriptor. + * @cyclic: true if this is a cyclic job + * + * This descriptor is used for both logical and physical transfers. + */ +struct d40_desc { + /* LLI physical */ + struct d40_phy_lli_bidir lli_phy; + /* LLI logical */ + struct d40_log_lli_bidir lli_log; + + struct d40_lli_pool lli_pool; + int lli_len; + int lli_current; + int lcla_alloc; + + struct dma_async_tx_descriptor txd; + struct list_head node; + + bool is_in_client_list; + bool cyclic; +}; + +/** + * struct d40_lcla_pool - LCLA pool settings and data. + * + * @base: The virtual address of LCLA. 18 bit aligned. + * @base_unaligned: The orignal kmalloc pointer, if kmalloc is used. + * This pointer is only there for clean-up on error. + * @pages: The number of pages needed for all physical channels. + * Only used later for clean-up on error + * @lock: Lock to protect the content in this struct. + * @alloc_map: big map over which LCLA entry is own by which job. + */ +struct d40_lcla_pool { + void *base; + dma_addr_t dma_addr; + void *base_unaligned; + int pages; + spinlock_t lock; + struct d40_desc **alloc_map; +}; + +/** + * struct d40_phy_res - struct for handling eventlines mapped to physical + * channels. + * + * @lock: A lock protection this entity. + * @reserved: True if used by secure world or otherwise. + * @num: The physical channel number of this entity. + * @allocated_src: Bit mapped to show which src event line's are mapped to + * this physical channel. Can also be free or physically allocated. + * @allocated_dst: Same as for src but is dst. + * allocated_dst and allocated_src uses the D40_ALLOC* defines as well as + * event line number. + * @use_soft_lli: To mark if the linked lists of channel are managed by SW. + */ +struct d40_phy_res { + spinlock_t lock; + bool reserved; + int num; + u32 allocated_src; + u32 allocated_dst; + bool use_soft_lli; +}; + +struct d40_base; + +/** + * struct d40_chan - Struct that describes a channel. + * + * @lock: A spinlock to protect this struct. + * @log_num: The logical number, if any of this channel. + * @pending_tx: The number of pending transfers. Used between interrupt handler + * and tasklet. + * @busy: Set to true when transfer is ongoing on this channel. + * @phy_chan: Pointer to physical channel which this instance runs on. If this + * point is NULL, then the channel is not allocated. + * @chan: DMA engine handle. + * @tasklet: Tasklet that gets scheduled from interrupt context to complete a + * transfer and call client callback. + * @client: Cliented owned descriptor list. + * @pending_queue: Submitted jobs, to be issued by issue_pending() + * @active: Active descriptor. + * @done: Completed jobs + * @queue: Queued jobs. + * @prepare_queue: Prepared jobs. + * @dma_cfg: The client configuration of this dma channel. + * @configured: whether the dma_cfg configuration is valid + * @base: Pointer to the device instance struct. + * @src_def_cfg: Default cfg register setting for src. + * @dst_def_cfg: Default cfg register setting for dst. + * @log_def: Default logical channel settings. + * @lcpa: Pointer to dst and src lcpa settings. + * @runtime_addr: runtime configured address. + * @runtime_direction: runtime configured direction. + * + * This struct can either "be" a logical or a physical channel. + */ +struct d40_chan { + spinlock_t lock; + int log_num; + int pending_tx; + bool busy; + struct d40_phy_res *phy_chan; + struct dma_chan chan; + struct tasklet_struct tasklet; + struct list_head client; + struct list_head pending_queue; + struct list_head active; + struct list_head done; + struct list_head queue; + struct list_head prepare_queue; + struct stedma40_chan_cfg dma_cfg; + bool configured; + struct d40_base *base; + /* Default register configurations */ + u32 src_def_cfg; + u32 dst_def_cfg; + struct d40_def_lcsp log_def; + struct d40_log_lli_full *lcpa; + /* Runtime reconfiguration */ + dma_addr_t runtime_addr; + enum dma_transfer_direction runtime_direction; +}; + +/** + * struct d40_gen_dmac - generic values to represent u8500/u8540 DMA + * controller + * + * @backup: the pointer to the registers address array for backup + * @backup_size: the size of the registers address array for backup + * @realtime_en: the realtime enable register + * @realtime_clear: the realtime clear register + * @high_prio_en: the high priority enable register + * @high_prio_clear: the high priority clear register + * @interrupt_en: the interrupt enable register + * @interrupt_clear: the interrupt clear register + * @il: the pointer to struct d40_interrupt_lookup + * @il_size: the size of d40_interrupt_lookup array + * @init_reg: the pointer to the struct d40_reg_val + * @init_reg_size: the size of d40_reg_val array + */ +struct d40_gen_dmac { + u32 *backup; + u32 backup_size; + u32 realtime_en; + u32 realtime_clear; + u32 high_prio_en; + u32 high_prio_clear; + u32 interrupt_en; + u32 interrupt_clear; + struct d40_interrupt_lookup *il; + u32 il_size; + struct d40_reg_val *init_reg; + u32 init_reg_size; +}; + +/** + * struct d40_base - The big global struct, one for each probe'd instance. + * + * @interrupt_lock: Lock used to make sure one interrupt is handle a time. + * @execmd_lock: Lock for execute command usage since several channels share + * the same physical register. + * @dev: The device structure. + * @virtbase: The virtual base address of the DMA's register. + * @rev: silicon revision detected. + * @clk: Pointer to the DMA clock structure. + * @phy_start: Physical memory start of the DMA registers. + * @phy_size: Size of the DMA register map. + * @irq: The IRQ number. + * @num_memcpy_chans: The number of channels used for memcpy (mem-to-mem + * transfers). + * @num_phy_chans: The number of physical channels. Read from HW. This + * is the number of available channels for this driver, not counting "Secure + * mode" allocated physical channels. + * @num_log_chans: The number of logical channels. Calculated from + * num_phy_chans. + * @dma_both: dma_device channels that can do both memcpy and slave transfers. + * @dma_slave: dma_device channels that can do only do slave transfers. + * @dma_memcpy: dma_device channels that can do only do memcpy transfers. + * @phy_chans: Room for all possible physical channels in system. + * @log_chans: Room for all possible logical channels in system. + * @lookup_log_chans: Used to map interrupt number to logical channel. Points + * to log_chans entries. + * @lookup_phy_chans: Used to map interrupt number to physical channel. Points + * to phy_chans entries. + * @plat_data: Pointer to provided platform_data which is the driver + * configuration. + * @lcpa_regulator: Pointer to hold the regulator for the esram bank for lcla. + * @phy_res: Vector containing all physical channels. + * @lcla_pool: lcla pool settings and data. + * @lcpa_base: The virtual mapped address of LCPA. + * @phy_lcpa: The physical address of the LCPA. + * @lcpa_size: The size of the LCPA area. + * @desc_slab: cache for descriptors. + * @reg_val_backup: Here the values of some hardware registers are stored + * before the DMA is powered off. They are restored when the power is back on. + * @reg_val_backup_v4: Backup of registers that only exits on dma40 v3 and + * later + * @reg_val_backup_chan: Backup data for standard channel parameter registers. + * @gcc_pwr_off_mask: Mask to maintain the channels that can be turned off. + * @gen_dmac: the struct for generic registers values to represent u8500/8540 + * DMA controller + */ +struct d40_base { + spinlock_t interrupt_lock; + spinlock_t execmd_lock; + struct device *dev; + void __iomem *virtbase; + u8 rev:4; + struct clk *clk; + phys_addr_t phy_start; + resource_size_t phy_size; + int irq; + int num_memcpy_chans; + int num_phy_chans; + int num_log_chans; + struct device_dma_parameters dma_parms; + struct dma_device dma_both; + struct dma_device dma_slave; + struct dma_device dma_memcpy; + struct d40_chan *phy_chans; + struct d40_chan *log_chans; + struct d40_chan **lookup_log_chans; + struct d40_chan **lookup_phy_chans; + struct stedma40_platform_data *plat_data; + struct regulator *lcpa_regulator; + /* Physical half channels */ + struct d40_phy_res *phy_res; + struct d40_lcla_pool lcla_pool; + void *lcpa_base; + dma_addr_t phy_lcpa; + resource_size_t lcpa_size; + struct kmem_cache *desc_slab; + u32 reg_val_backup[BACKUP_REGS_SZ]; + u32 reg_val_backup_v4[BACKUP_REGS_SZ_MAX]; + u32 *reg_val_backup_chan; + u16 gcc_pwr_off_mask; + struct d40_gen_dmac gen_dmac; +}; + +static struct device *chan2dev(struct d40_chan *d40c) +{ + return &d40c->chan.dev->device; +} + +static bool chan_is_physical(struct d40_chan *chan) +{ + return chan->log_num == D40_PHY_CHAN; +} + +static bool chan_is_logical(struct d40_chan *chan) +{ + return !chan_is_physical(chan); +} + +static void __iomem *chan_base(struct d40_chan *chan) +{ + return chan->base->virtbase + D40_DREG_PCBASE + + chan->phy_chan->num * D40_DREG_PCDELTA; +} + +#define d40_err(dev, format, arg...) \ + dev_err(dev, "[%s] " format, __func__, ## arg) + +#define chan_err(d40c, format, arg...) \ + d40_err(chan2dev(d40c), format, ## arg) + +static int d40_pool_lli_alloc(struct d40_chan *d40c, struct d40_desc *d40d, + int lli_len) +{ + bool is_log = chan_is_logical(d40c); + u32 align; + void *base; + + if (is_log) + align = sizeof(struct d40_log_lli); + else + align = sizeof(struct d40_phy_lli); + + if (lli_len == 1) { + base = d40d->lli_pool.pre_alloc_lli; + d40d->lli_pool.size = sizeof(d40d->lli_pool.pre_alloc_lli); + d40d->lli_pool.base = NULL; + } else { + d40d->lli_pool.size = lli_len * 2 * align; + + base = kmalloc(d40d->lli_pool.size + align, GFP_NOWAIT); + d40d->lli_pool.base = base; + + if (d40d->lli_pool.base == NULL) + return -ENOMEM; + } + + if (is_log) { + d40d->lli_log.src = PTR_ALIGN(base, align); + d40d->lli_log.dst = d40d->lli_log.src + lli_len; + + d40d->lli_pool.dma_addr = 0; + } else { + d40d->lli_phy.src = PTR_ALIGN(base, align); + d40d->lli_phy.dst = d40d->lli_phy.src + lli_len; + + d40d->lli_pool.dma_addr = dma_map_single(d40c->base->dev, + d40d->lli_phy.src, + d40d->lli_pool.size, + DMA_TO_DEVICE); + + if (dma_mapping_error(d40c->base->dev, + d40d->lli_pool.dma_addr)) { + kfree(d40d->lli_pool.base); + d40d->lli_pool.base = NULL; + d40d->lli_pool.dma_addr = 0; + return -ENOMEM; + } + } + + return 0; +} + +static void d40_pool_lli_free(struct d40_chan *d40c, struct d40_desc *d40d) +{ + if (d40d->lli_pool.dma_addr) + dma_unmap_single(d40c->base->dev, d40d->lli_pool.dma_addr, + d40d->lli_pool.size, DMA_TO_DEVICE); + + kfree(d40d->lli_pool.base); + d40d->lli_pool.base = NULL; + d40d->lli_pool.size = 0; + d40d->lli_log.src = NULL; + d40d->lli_log.dst = NULL; + d40d->lli_phy.src = NULL; + d40d->lli_phy.dst = NULL; +} + +static int d40_lcla_alloc_one(struct d40_chan *d40c, + struct d40_desc *d40d) +{ + unsigned long flags; + int i; + int ret = -EINVAL; + + spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags); + + /* + * Allocate both src and dst at the same time, therefore the half + * start on 1 since 0 can't be used since zero is used as end marker. + */ + for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) { + int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i; + + if (!d40c->base->lcla_pool.alloc_map[idx]) { + d40c->base->lcla_pool.alloc_map[idx] = d40d; + d40d->lcla_alloc++; + ret = i; + break; + } + } + + spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags); + + return ret; +} + +static int d40_lcla_free_all(struct d40_chan *d40c, + struct d40_desc *d40d) +{ + unsigned long flags; + int i; + int ret = -EINVAL; + + if (chan_is_physical(d40c)) + return 0; + + spin_lock_irqsave(&d40c->base->lcla_pool.lock, flags); + + for (i = 1 ; i < D40_LCLA_LINK_PER_EVENT_GRP / 2; i++) { + int idx = d40c->phy_chan->num * D40_LCLA_LINK_PER_EVENT_GRP + i; + + if (d40c->base->lcla_pool.alloc_map[idx] == d40d) { + d40c->base->lcla_pool.alloc_map[idx] = NULL; + d40d->lcla_alloc--; + if (d40d->lcla_alloc == 0) { + ret = 0; + break; + } + } + } + + spin_unlock_irqrestore(&d40c->base->lcla_pool.lock, flags); + + return ret; + +} + +static void d40_desc_remove(struct d40_desc *d40d) +{ + list_del(&d40d->node); +} + +static struct d40_desc *d40_desc_get(struct d40_chan *d40c) +{ + struct d40_desc *desc = NULL; + + if (!list_empty(&d40c->client)) { + struct d40_desc *d; + struct d40_desc *_d; + + list_for_each_entry_safe(d, _d, &d40c->client, node) { + if (async_tx_test_ack(&d->txd)) { + d40_desc_remove(d); + desc = d; + memset(desc, 0, sizeof(*desc)); + break; + } + } + } + + if (!desc) + desc = kmem_cache_zalloc(d40c->base->desc_slab, GFP_NOWAIT); + + if (desc) + INIT_LIST_HEAD(&desc->node); + + return desc; +} + +static void d40_desc_free(struct d40_chan *d40c, struct d40_desc *d40d) +{ + + d40_pool_lli_free(d40c, d40d); + d40_lcla_free_all(d40c, d40d); + kmem_cache_free(d40c->base->desc_slab, d40d); +} + +static void d40_desc_submit(struct d40_chan *d40c, struct d40_desc *desc) +{ + list_add_tail(&desc->node, &d40c->active); +} + +static void d40_phy_lli_load(struct d40_chan *chan, struct d40_desc *desc) +{ + struct d40_phy_lli *lli_dst = desc->lli_phy.dst; + struct d40_phy_lli *lli_src = desc->lli_phy.src; + void __iomem *base = chan_base(chan); + + writel(lli_src->reg_cfg, base + D40_CHAN_REG_SSCFG); + writel(lli_src->reg_elt, base + D40_CHAN_REG_SSELT); + writel(lli_src->reg_ptr, base + D40_CHAN_REG_SSPTR); + writel(lli_src->reg_lnk, base + D40_CHAN_REG_SSLNK); + + writel(lli_dst->reg_cfg, base + D40_CHAN_REG_SDCFG); + writel(lli_dst->reg_elt, base + D40_CHAN_REG_SDELT); + writel(lli_dst->reg_ptr, base + D40_CHAN_REG_SDPTR); + writel(lli_dst->reg_lnk, base + D40_CHAN_REG_SDLNK); +} + +static void d40_desc_done(struct d40_chan *d40c, struct d40_desc *desc) +{ + list_add_tail(&desc->node, &d40c->done); +} + +static void d40_log_lli_to_lcxa(struct d40_chan *chan, struct d40_desc *desc) +{ + struct d40_lcla_pool *pool = &chan->base->lcla_pool; + struct d40_log_lli_bidir *lli = &desc->lli_log; + int lli_current = desc->lli_current; + int lli_len = desc->lli_len; + bool cyclic = desc->cyclic; + int curr_lcla = -EINVAL; + int first_lcla = 0; + bool use_esram_lcla = chan->base->plat_data->use_esram_lcla; + bool linkback; + + /* + * We may have partially running cyclic transfers, in case we did't get + * enough LCLA entries. + */ + linkback = cyclic && lli_current == 0; + + /* + * For linkback, we need one LCLA even with only one link, because we + * can't link back to the one in LCPA space + */ + if (linkback || (lli_len - lli_current > 1)) { + /* + * If the channel is expected to use only soft_lli don't + * allocate a lcla. This is to avoid a HW issue that exists + * in some controller during a peripheral to memory transfer + * that uses linked lists. + */ + if (!(chan->phy_chan->use_soft_lli && + chan->dma_cfg.dir == DMA_DEV_TO_MEM)) + curr_lcla = d40_lcla_alloc_one(chan, desc); + + first_lcla = curr_lcla; + } + + /* + * For linkback, we normally load the LCPA in the loop since we need to + * link it to the second LCLA and not the first. However, if we + * couldn't even get a first LCLA, then we have to run in LCPA and + * reload manually. + */ + if (!linkback || curr_lcla == -EINVAL) { + unsigned int flags = 0; + + if (curr_lcla == -EINVAL) + flags |= LLI_TERM_INT; + + d40_log_lli_lcpa_write(chan->lcpa, + &lli->dst[lli_current], + &lli->src[lli_current], + curr_lcla, + flags); + lli_current++; + } + + if (curr_lcla < 0) + goto out; + + for (; lli_current < lli_len; lli_current++) { + unsigned int lcla_offset = chan->phy_chan->num * 1024 + + 8 * curr_lcla * 2; + struct d40_log_lli *lcla = pool->base + lcla_offset; + unsigned int flags = 0; + int next_lcla; + + if (lli_current + 1 < lli_len) + next_lcla = d40_lcla_alloc_one(chan, desc); + else + next_lcla = linkback ? first_lcla : -EINVAL; + + if (cyclic || next_lcla == -EINVAL) + flags |= LLI_TERM_INT; + + if (linkback && curr_lcla == first_lcla) { + /* First link goes in both LCPA and LCLA */ + d40_log_lli_lcpa_write(chan->lcpa, + &lli->dst[lli_current], + &lli->src[lli_current], + next_lcla, flags); + } + + /* + * One unused LCLA in the cyclic case if the very first + * next_lcla fails... + */ + d40_log_lli_lcla_write(lcla, + &lli->dst[lli_current], + &lli->src[lli_current], + next_lcla, flags); + + /* + * Cache maintenance is not needed if lcla is + * mapped in esram + */ + if (!use_esram_lcla) { + dma_sync_single_range_for_device(chan->base->dev, + pool->dma_addr, lcla_offset, + 2 * sizeof(struct d40_log_lli), + DMA_TO_DEVICE); + } + curr_lcla = next_lcla; + + if (curr_lcla == -EINVAL || curr_lcla == first_lcla) { + lli_current++; + break; + } + } + +out: + desc->lli_current = lli_current; +} + +static void d40_desc_load(struct d40_chan *d40c, struct d40_desc *d40d) +{ + if (chan_is_physical(d40c)) { + d40_phy_lli_load(d40c, d40d); + d40d->lli_current = d40d->lli_len; + } else + d40_log_lli_to_lcxa(d40c, d40d); +} + +static struct d40_desc *d40_first_active_get(struct d40_chan *d40c) +{ + struct d40_desc *d; + + if (list_empty(&d40c->active)) + return NULL; + + d = list_first_entry(&d40c->active, + struct d40_desc, + node); + return d; +} + +/* remove desc from current queue and add it to the pending_queue */ +static void d40_desc_queue(struct d40_chan *d40c, struct d40_desc *desc) +{ + d40_desc_remove(desc); + desc->is_in_client_list = false; + list_add_tail(&desc->node, &d40c->pending_queue); +} + +static struct d40_desc *d40_first_pending(struct d40_chan *d40c) +{ + struct d40_desc *d; + + if (list_empty(&d40c->pending_queue)) + return NULL; + + d = list_first_entry(&d40c->pending_queue, + struct d40_desc, + node); + return d; +} + +static struct d40_desc *d40_first_queued(struct d40_chan *d40c) +{ + struct d40_desc *d; + + if (list_empty(&d40c->queue)) + return NULL; + + d = list_first_entry(&d40c->queue, + struct d40_desc, + node); + return d; +} + +static struct d40_desc *d40_first_done(struct d40_chan *d40c) +{ + if (list_empty(&d40c->done)) + return NULL; + + return list_first_entry(&d40c->done, struct d40_desc, node); +} + +static int d40_psize_2_burst_size(bool is_log, int psize) +{ + if (is_log) { + if (psize == STEDMA40_PSIZE_LOG_1) + return 1; + } else { + if (psize == STEDMA40_PSIZE_PHY_1) + return 1; + } + + return 2 << psize; +} + +/* + * The dma only supports transmitting packages up to + * STEDMA40_MAX_SEG_SIZE * data_width, where data_width is stored in Bytes. + * + * Calculate the total number of dma elements required to send the entire sg list. + */ +static int d40_size_2_dmalen(int size, u32 data_width1, u32 data_width2) +{ + int dmalen; + u32 max_w = max(data_width1, data_width2); + u32 min_w = min(data_width1, data_width2); + u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w); + + if (seg_max > STEDMA40_MAX_SEG_SIZE) + seg_max -= max_w; + + if (!IS_ALIGNED(size, max_w)) + return -EINVAL; + + if (size <= seg_max) + dmalen = 1; + else { + dmalen = size / seg_max; + if (dmalen * seg_max < size) + dmalen++; + } + return dmalen; +} + +static int d40_sg_2_dmalen(struct scatterlist *sgl, int sg_len, + u32 data_width1, u32 data_width2) +{ + struct scatterlist *sg; + int i; + int len = 0; + int ret; + + for_each_sg(sgl, sg, sg_len, i) { + ret = d40_size_2_dmalen(sg_dma_len(sg), + data_width1, data_width2); + if (ret < 0) + return ret; + len += ret; + } + return len; +} + +static int __d40_execute_command_phy(struct d40_chan *d40c, + enum d40_command command) +{ + u32 status; + int i; + void __iomem *active_reg; + int ret = 0; + unsigned long flags; + u32 wmask; + + if (command == D40_DMA_STOP) { + ret = __d40_execute_command_phy(d40c, D40_DMA_SUSPEND_REQ); + if (ret) + return ret; + } + + spin_lock_irqsave(&d40c->base->execmd_lock, flags); + + if (d40c->phy_chan->num % 2 == 0) + active_reg = d40c->base->virtbase + D40_DREG_ACTIVE; + else + active_reg = d40c->base->virtbase + D40_DREG_ACTIVO; + + if (command == D40_DMA_SUSPEND_REQ) { + status = (readl(active_reg) & + D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> + D40_CHAN_POS(d40c->phy_chan->num); + + if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP) + goto done; + } + + wmask = 0xffffffff & ~(D40_CHAN_POS_MASK(d40c->phy_chan->num)); + writel(wmask | (command << D40_CHAN_POS(d40c->phy_chan->num)), + active_reg); + + if (command == D40_DMA_SUSPEND_REQ) { + + for (i = 0 ; i < D40_SUSPEND_MAX_IT; i++) { + status = (readl(active_reg) & + D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> + D40_CHAN_POS(d40c->phy_chan->num); + + cpu_relax(); + /* + * Reduce the number of bus accesses while + * waiting for the DMA to suspend. + */ + udelay(3); + + if (status == D40_DMA_STOP || + status == D40_DMA_SUSPENDED) + break; + } + + if (i == D40_SUSPEND_MAX_IT) { + chan_err(d40c, + "unable to suspend the chl %d (log: %d) status %x\n", + d40c->phy_chan->num, d40c->log_num, + status); + dump_stack(); + ret = -EBUSY; + } + + } +done: + spin_unlock_irqrestore(&d40c->base->execmd_lock, flags); + return ret; +} + +static void d40_term_all(struct d40_chan *d40c) +{ + struct d40_desc *d40d; + struct d40_desc *_d; + + /* Release completed descriptors */ + while ((d40d = d40_first_done(d40c))) { + d40_desc_remove(d40d); + d40_desc_free(d40c, d40d); + } + + /* Release active descriptors */ + while ((d40d = d40_first_active_get(d40c))) { + d40_desc_remove(d40d); + d40_desc_free(d40c, d40d); + } + + /* Release queued descriptors waiting for transfer */ + while ((d40d = d40_first_queued(d40c))) { + d40_desc_remove(d40d); + d40_desc_free(d40c, d40d); + } + + /* Release pending descriptors */ + while ((d40d = d40_first_pending(d40c))) { + d40_desc_remove(d40d); + d40_desc_free(d40c, d40d); + } + + /* Release client owned descriptors */ + if (!list_empty(&d40c->client)) + list_for_each_entry_safe(d40d, _d, &d40c->client, node) { + d40_desc_remove(d40d); + d40_desc_free(d40c, d40d); + } + + /* Release descriptors in prepare queue */ + if (!list_empty(&d40c->prepare_queue)) + list_for_each_entry_safe(d40d, _d, + &d40c->prepare_queue, node) { + d40_desc_remove(d40d); + d40_desc_free(d40c, d40d); + } + + d40c->pending_tx = 0; +} + +static void __d40_config_set_event(struct d40_chan *d40c, + enum d40_events event_type, u32 event, + int reg) +{ + void __iomem *addr = chan_base(d40c) + reg; + int tries; + u32 status; + + switch (event_type) { + + case D40_DEACTIVATE_EVENTLINE: + + writel((D40_DEACTIVATE_EVENTLINE << D40_EVENTLINE_POS(event)) + | ~D40_EVENTLINE_MASK(event), addr); + break; + + case D40_SUSPEND_REQ_EVENTLINE: + status = (readl(addr) & D40_EVENTLINE_MASK(event)) >> + D40_EVENTLINE_POS(event); + + if (status == D40_DEACTIVATE_EVENTLINE || + status == D40_SUSPEND_REQ_EVENTLINE) + break; + + writel((D40_SUSPEND_REQ_EVENTLINE << D40_EVENTLINE_POS(event)) + | ~D40_EVENTLINE_MASK(event), addr); + + for (tries = 0 ; tries < D40_SUSPEND_MAX_IT; tries++) { + + status = (readl(addr) & D40_EVENTLINE_MASK(event)) >> + D40_EVENTLINE_POS(event); + + cpu_relax(); + /* + * Reduce the number of bus accesses while + * waiting for the DMA to suspend. + */ + udelay(3); + + if (status == D40_DEACTIVATE_EVENTLINE) + break; + } + + if (tries == D40_SUSPEND_MAX_IT) { + chan_err(d40c, + "unable to stop the event_line chl %d (log: %d)" + "status %x\n", d40c->phy_chan->num, + d40c->log_num, status); + } + break; + + case D40_ACTIVATE_EVENTLINE: + /* + * The hardware sometimes doesn't register the enable when src and dst + * event lines are active on the same logical channel. Retry to ensure + * it does. Usually only one retry is sufficient. + */ + tries = 100; + while (--tries) { + writel((D40_ACTIVATE_EVENTLINE << + D40_EVENTLINE_POS(event)) | + ~D40_EVENTLINE_MASK(event), addr); + + if (readl(addr) & D40_EVENTLINE_MASK(event)) + break; + } + + if (tries != 99) + dev_dbg(chan2dev(d40c), + "[%s] workaround enable S%cLNK (%d tries)\n", + __func__, reg == D40_CHAN_REG_SSLNK ? 'S' : 'D', + 100 - tries); + + WARN_ON(!tries); + break; + + case D40_ROUND_EVENTLINE: + BUG(); + break; + + } +} + +static void d40_config_set_event(struct d40_chan *d40c, + enum d40_events event_type) +{ + u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type); + + /* Enable event line connected to device (or memcpy) */ + if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) || + (d40c->dma_cfg.dir == DMA_DEV_TO_DEV)) + __d40_config_set_event(d40c, event_type, event, + D40_CHAN_REG_SSLNK); + + if (d40c->dma_cfg.dir != DMA_DEV_TO_MEM) + __d40_config_set_event(d40c, event_type, event, + D40_CHAN_REG_SDLNK); +} + +static u32 d40_chan_has_events(struct d40_chan *d40c) +{ + void __iomem *chanbase = chan_base(d40c); + u32 val; + + val = readl(chanbase + D40_CHAN_REG_SSLNK); + val |= readl(chanbase + D40_CHAN_REG_SDLNK); + + return val; +} + +static int +__d40_execute_command_log(struct d40_chan *d40c, enum d40_command command) +{ + unsigned long flags; + int ret = 0; + u32 active_status; + void __iomem *active_reg; + + if (d40c->phy_chan->num % 2 == 0) + active_reg = d40c->base->virtbase + D40_DREG_ACTIVE; + else + active_reg = d40c->base->virtbase + D40_DREG_ACTIVO; + + + spin_lock_irqsave(&d40c->phy_chan->lock, flags); + + switch (command) { + case D40_DMA_STOP: + case D40_DMA_SUSPEND_REQ: + + active_status = (readl(active_reg) & + D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> + D40_CHAN_POS(d40c->phy_chan->num); + + if (active_status == D40_DMA_RUN) + d40_config_set_event(d40c, D40_SUSPEND_REQ_EVENTLINE); + else + d40_config_set_event(d40c, D40_DEACTIVATE_EVENTLINE); + + if (!d40_chan_has_events(d40c) && (command == D40_DMA_STOP)) + ret = __d40_execute_command_phy(d40c, command); + + break; + + case D40_DMA_RUN: + + d40_config_set_event(d40c, D40_ACTIVATE_EVENTLINE); + ret = __d40_execute_command_phy(d40c, command); + break; + + case D40_DMA_SUSPENDED: + BUG(); + break; + } + + spin_unlock_irqrestore(&d40c->phy_chan->lock, flags); + return ret; +} + +static int d40_channel_execute_command(struct d40_chan *d40c, + enum d40_command command) +{ + if (chan_is_logical(d40c)) + return __d40_execute_command_log(d40c, command); + else + return __d40_execute_command_phy(d40c, command); +} + +static u32 d40_get_prmo(struct d40_chan *d40c) +{ + static const unsigned int phy_map[] = { + [STEDMA40_PCHAN_BASIC_MODE] + = D40_DREG_PRMO_PCHAN_BASIC, + [STEDMA40_PCHAN_MODULO_MODE] + = D40_DREG_PRMO_PCHAN_MODULO, + [STEDMA40_PCHAN_DOUBLE_DST_MODE] + = D40_DREG_PRMO_PCHAN_DOUBLE_DST, + }; + static const unsigned int log_map[] = { + [STEDMA40_LCHAN_SRC_PHY_DST_LOG] + = D40_DREG_PRMO_LCHAN_SRC_PHY_DST_LOG, + [STEDMA40_LCHAN_SRC_LOG_DST_PHY] + = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_PHY, + [STEDMA40_LCHAN_SRC_LOG_DST_LOG] + = D40_DREG_PRMO_LCHAN_SRC_LOG_DST_LOG, + }; + + if (chan_is_physical(d40c)) + return phy_map[d40c->dma_cfg.mode_opt]; + else + return log_map[d40c->dma_cfg.mode_opt]; +} + +static void d40_config_write(struct d40_chan *d40c) +{ + u32 addr_base; + u32 var; + + /* Odd addresses are even addresses + 4 */ + addr_base = (d40c->phy_chan->num % 2) * 4; + /* Setup channel mode to logical or physical */ + var = ((u32)(chan_is_logical(d40c)) + 1) << + D40_CHAN_POS(d40c->phy_chan->num); + writel(var, d40c->base->virtbase + D40_DREG_PRMSE + addr_base); + + /* Setup operational mode option register */ + var = d40_get_prmo(d40c) << D40_CHAN_POS(d40c->phy_chan->num); + + writel(var, d40c->base->virtbase + D40_DREG_PRMOE + addr_base); + + if (chan_is_logical(d40c)) { + int lidx = (d40c->phy_chan->num << D40_SREG_ELEM_LOG_LIDX_POS) + & D40_SREG_ELEM_LOG_LIDX_MASK; + void __iomem *chanbase = chan_base(d40c); + + /* Set default config for CFG reg */ + writel(d40c->src_def_cfg, chanbase + D40_CHAN_REG_SSCFG); + writel(d40c->dst_def_cfg, chanbase + D40_CHAN_REG_SDCFG); + + /* Set LIDX for lcla */ + writel(lidx, chanbase + D40_CHAN_REG_SSELT); + writel(lidx, chanbase + D40_CHAN_REG_SDELT); + + /* Clear LNK which will be used by d40_chan_has_events() */ + writel(0, chanbase + D40_CHAN_REG_SSLNK); + writel(0, chanbase + D40_CHAN_REG_SDLNK); + } +} + +static u32 d40_residue(struct d40_chan *d40c) +{ + u32 num_elt; + + if (chan_is_logical(d40c)) + num_elt = (readl(&d40c->lcpa->lcsp2) & D40_MEM_LCSP2_ECNT_MASK) + >> D40_MEM_LCSP2_ECNT_POS; + else { + u32 val = readl(chan_base(d40c) + D40_CHAN_REG_SDELT); + num_elt = (val & D40_SREG_ELEM_PHY_ECNT_MASK) + >> D40_SREG_ELEM_PHY_ECNT_POS; + } + + return num_elt * d40c->dma_cfg.dst_info.data_width; +} + +static bool d40_tx_is_linked(struct d40_chan *d40c) +{ + bool is_link; + + if (chan_is_logical(d40c)) + is_link = readl(&d40c->lcpa->lcsp3) & D40_MEM_LCSP3_DLOS_MASK; + else + is_link = readl(chan_base(d40c) + D40_CHAN_REG_SDLNK) + & D40_SREG_LNK_PHYS_LNK_MASK; + + return is_link; +} + +static int d40_pause(struct dma_chan *chan) +{ + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + int res = 0; + unsigned long flags; + + if (d40c->phy_chan == NULL) { + chan_err(d40c, "Channel is not allocated!\n"); + return -EINVAL; + } + + if (!d40c->busy) + return 0; + + spin_lock_irqsave(&d40c->lock, flags); + pm_runtime_get_sync(d40c->base->dev); + + res = d40_channel_execute_command(d40c, D40_DMA_SUSPEND_REQ); + + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + spin_unlock_irqrestore(&d40c->lock, flags); + return res; +} + +static int d40_resume(struct dma_chan *chan) +{ + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + int res = 0; + unsigned long flags; + + if (d40c->phy_chan == NULL) { + chan_err(d40c, "Channel is not allocated!\n"); + return -EINVAL; + } + + if (!d40c->busy) + return 0; + + spin_lock_irqsave(&d40c->lock, flags); + pm_runtime_get_sync(d40c->base->dev); + + /* If bytes left to transfer or linked tx resume job */ + if (d40_residue(d40c) || d40_tx_is_linked(d40c)) + res = d40_channel_execute_command(d40c, D40_DMA_RUN); + + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + spin_unlock_irqrestore(&d40c->lock, flags); + return res; +} + +static dma_cookie_t d40_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct d40_chan *d40c = container_of(tx->chan, + struct d40_chan, + chan); + struct d40_desc *d40d = container_of(tx, struct d40_desc, txd); + unsigned long flags; + dma_cookie_t cookie; + + spin_lock_irqsave(&d40c->lock, flags); + cookie = dma_cookie_assign(tx); + d40_desc_queue(d40c, d40d); + spin_unlock_irqrestore(&d40c->lock, flags); + + return cookie; +} + +static int d40_start(struct d40_chan *d40c) +{ + return d40_channel_execute_command(d40c, D40_DMA_RUN); +} + +static struct d40_desc *d40_queue_start(struct d40_chan *d40c) +{ + struct d40_desc *d40d; + int err; + + /* Start queued jobs, if any */ + d40d = d40_first_queued(d40c); + + if (d40d != NULL) { + if (!d40c->busy) { + d40c->busy = true; + pm_runtime_get_sync(d40c->base->dev); + } + + /* Remove from queue */ + d40_desc_remove(d40d); + + /* Add to active queue */ + d40_desc_submit(d40c, d40d); + + /* Initiate DMA job */ + d40_desc_load(d40c, d40d); + + /* Start dma job */ + err = d40_start(d40c); + + if (err) + return NULL; + } + + return d40d; +} + +/* called from interrupt context */ +static void dma_tc_handle(struct d40_chan *d40c) +{ + struct d40_desc *d40d; + + /* Get first active entry from list */ + d40d = d40_first_active_get(d40c); + + if (d40d == NULL) + return; + + if (d40d->cyclic) { + /* + * If this was a paritially loaded list, we need to reloaded + * it, and only when the list is completed. We need to check + * for done because the interrupt will hit for every link, and + * not just the last one. + */ + if (d40d->lli_current < d40d->lli_len + && !d40_tx_is_linked(d40c) + && !d40_residue(d40c)) { + d40_lcla_free_all(d40c, d40d); + d40_desc_load(d40c, d40d); + (void) d40_start(d40c); + + if (d40d->lli_current == d40d->lli_len) + d40d->lli_current = 0; + } + } else { + d40_lcla_free_all(d40c, d40d); + + if (d40d->lli_current < d40d->lli_len) { + d40_desc_load(d40c, d40d); + /* Start dma job */ + (void) d40_start(d40c); + return; + } + + if (d40_queue_start(d40c) == NULL) { + d40c->busy = false; + + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + } + + d40_desc_remove(d40d); + d40_desc_done(d40c, d40d); + } + + d40c->pending_tx++; + tasklet_schedule(&d40c->tasklet); + +} + +static void dma_tasklet(unsigned long data) +{ + struct d40_chan *d40c = (struct d40_chan *) data; + struct d40_desc *d40d; + unsigned long flags; + bool callback_active; + dma_async_tx_callback callback; + void *callback_param; + + spin_lock_irqsave(&d40c->lock, flags); + + /* Get first entry from the done list */ + d40d = d40_first_done(d40c); + if (d40d == NULL) { + /* Check if we have reached here for cyclic job */ + d40d = d40_first_active_get(d40c); + if (d40d == NULL || !d40d->cyclic) + goto err; + } + + if (!d40d->cyclic) + dma_cookie_complete(&d40d->txd); + + /* + * If terminating a channel pending_tx is set to zero. + * This prevents any finished active jobs to return to the client. + */ + if (d40c->pending_tx == 0) { + spin_unlock_irqrestore(&d40c->lock, flags); + return; + } + + /* Callback to client */ + callback_active = !!(d40d->txd.flags & DMA_PREP_INTERRUPT); + callback = d40d->txd.callback; + callback_param = d40d->txd.callback_param; + + if (!d40d->cyclic) { + if (async_tx_test_ack(&d40d->txd)) { + d40_desc_remove(d40d); + d40_desc_free(d40c, d40d); + } else if (!d40d->is_in_client_list) { + d40_desc_remove(d40d); + d40_lcla_free_all(d40c, d40d); + list_add_tail(&d40d->node, &d40c->client); + d40d->is_in_client_list = true; + } + } + + d40c->pending_tx--; + + if (d40c->pending_tx) + tasklet_schedule(&d40c->tasklet); + + spin_unlock_irqrestore(&d40c->lock, flags); + + if (callback_active && callback) + callback(callback_param); + + return; + +err: + /* Rescue manouver if receiving double interrupts */ + if (d40c->pending_tx > 0) + d40c->pending_tx--; + spin_unlock_irqrestore(&d40c->lock, flags); +} + +static irqreturn_t d40_handle_interrupt(int irq, void *data) +{ + int i; + u32 idx; + u32 row; + long chan = -1; + struct d40_chan *d40c; + unsigned long flags; + struct d40_base *base = data; + u32 regs[base->gen_dmac.il_size]; + struct d40_interrupt_lookup *il = base->gen_dmac.il; + u32 il_size = base->gen_dmac.il_size; + + spin_lock_irqsave(&base->interrupt_lock, flags); + + /* Read interrupt status of both logical and physical channels */ + for (i = 0; i < il_size; i++) + regs[i] = readl(base->virtbase + il[i].src); + + for (;;) { + + chan = find_next_bit((unsigned long *)regs, + BITS_PER_LONG * il_size, chan + 1); + + /* No more set bits found? */ + if (chan == BITS_PER_LONG * il_size) + break; + + row = chan / BITS_PER_LONG; + idx = chan & (BITS_PER_LONG - 1); + + if (il[row].offset == D40_PHY_CHAN) + d40c = base->lookup_phy_chans[idx]; + else + d40c = base->lookup_log_chans[il[row].offset + idx]; + + if (!d40c) { + /* + * No error because this can happen if something else + * in the system is using the channel. + */ + continue; + } + + /* ACK interrupt */ + writel(BIT(idx), base->virtbase + il[row].clr); + + spin_lock(&d40c->lock); + + if (!il[row].is_error) + dma_tc_handle(d40c); + else + d40_err(base->dev, "IRQ chan: %ld offset %d idx %d\n", + chan, il[row].offset, idx); + + spin_unlock(&d40c->lock); + } + + spin_unlock_irqrestore(&base->interrupt_lock, flags); + + return IRQ_HANDLED; +} + +static int d40_validate_conf(struct d40_chan *d40c, + struct stedma40_chan_cfg *conf) +{ + int res = 0; + bool is_log = conf->mode == STEDMA40_MODE_LOGICAL; + + if (!conf->dir) { + chan_err(d40c, "Invalid direction.\n"); + res = -EINVAL; + } + + if ((is_log && conf->dev_type > d40c->base->num_log_chans) || + (!is_log && conf->dev_type > d40c->base->num_phy_chans) || + (conf->dev_type < 0)) { + chan_err(d40c, "Invalid device type (%d)\n", conf->dev_type); + res = -EINVAL; + } + + if (conf->dir == DMA_DEV_TO_DEV) { + /* + * DMAC HW supports it. Will be added to this driver, + * in case any dma client requires it. + */ + chan_err(d40c, "periph to periph not supported\n"); + res = -EINVAL; + } + + if (d40_psize_2_burst_size(is_log, conf->src_info.psize) * + conf->src_info.data_width != + d40_psize_2_burst_size(is_log, conf->dst_info.psize) * + conf->dst_info.data_width) { + /* + * The DMAC hardware only supports + * src (burst x width) == dst (burst x width) + */ + + chan_err(d40c, "src (burst x width) != dst (burst x width)\n"); + res = -EINVAL; + } + + return res; +} + +static bool d40_alloc_mask_set(struct d40_phy_res *phy, + bool is_src, int log_event_line, bool is_log, + bool *first_user) +{ + unsigned long flags; + spin_lock_irqsave(&phy->lock, flags); + + *first_user = ((phy->allocated_src | phy->allocated_dst) + == D40_ALLOC_FREE); + + if (!is_log) { + /* Physical interrupts are masked per physical full channel */ + if (phy->allocated_src == D40_ALLOC_FREE && + phy->allocated_dst == D40_ALLOC_FREE) { + phy->allocated_dst = D40_ALLOC_PHY; + phy->allocated_src = D40_ALLOC_PHY; + goto found; + } else + goto not_found; + } + + /* Logical channel */ + if (is_src) { + if (phy->allocated_src == D40_ALLOC_PHY) + goto not_found; + + if (phy->allocated_src == D40_ALLOC_FREE) + phy->allocated_src = D40_ALLOC_LOG_FREE; + + if (!(phy->allocated_src & BIT(log_event_line))) { + phy->allocated_src |= BIT(log_event_line); + goto found; + } else + goto not_found; + } else { + if (phy->allocated_dst == D40_ALLOC_PHY) + goto not_found; + + if (phy->allocated_dst == D40_ALLOC_FREE) + phy->allocated_dst = D40_ALLOC_LOG_FREE; + + if (!(phy->allocated_dst & BIT(log_event_line))) { + phy->allocated_dst |= BIT(log_event_line); + goto found; + } else + goto not_found; + } + +not_found: + spin_unlock_irqrestore(&phy->lock, flags); + return false; +found: + spin_unlock_irqrestore(&phy->lock, flags); + return true; +} + +static bool d40_alloc_mask_free(struct d40_phy_res *phy, bool is_src, + int log_event_line) +{ + unsigned long flags; + bool is_free = false; + + spin_lock_irqsave(&phy->lock, flags); + if (!log_event_line) { + phy->allocated_dst = D40_ALLOC_FREE; + phy->allocated_src = D40_ALLOC_FREE; + is_free = true; + goto out; + } + + /* Logical channel */ + if (is_src) { + phy->allocated_src &= ~BIT(log_event_line); + if (phy->allocated_src == D40_ALLOC_LOG_FREE) + phy->allocated_src = D40_ALLOC_FREE; + } else { + phy->allocated_dst &= ~BIT(log_event_line); + if (phy->allocated_dst == D40_ALLOC_LOG_FREE) + phy->allocated_dst = D40_ALLOC_FREE; + } + + is_free = ((phy->allocated_src | phy->allocated_dst) == + D40_ALLOC_FREE); + +out: + spin_unlock_irqrestore(&phy->lock, flags); + + return is_free; +} + +static int d40_allocate_channel(struct d40_chan *d40c, bool *first_phy_user) +{ + int dev_type = d40c->dma_cfg.dev_type; + int event_group; + int event_line; + struct d40_phy_res *phys; + int i; + int j; + int log_num; + int num_phy_chans; + bool is_src; + bool is_log = d40c->dma_cfg.mode == STEDMA40_MODE_LOGICAL; + + phys = d40c->base->phy_res; + num_phy_chans = d40c->base->num_phy_chans; + + if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) { + log_num = 2 * dev_type; + is_src = true; + } else if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV || + d40c->dma_cfg.dir == DMA_MEM_TO_MEM) { + /* dst event lines are used for logical memcpy */ + log_num = 2 * dev_type + 1; + is_src = false; + } else + return -EINVAL; + + event_group = D40_TYPE_TO_GROUP(dev_type); + event_line = D40_TYPE_TO_EVENT(dev_type); + + if (!is_log) { + if (d40c->dma_cfg.dir == DMA_MEM_TO_MEM) { + /* Find physical half channel */ + if (d40c->dma_cfg.use_fixed_channel) { + i = d40c->dma_cfg.phy_channel; + if (d40_alloc_mask_set(&phys[i], is_src, + 0, is_log, + first_phy_user)) + goto found_phy; + } else { + for (i = 0; i < num_phy_chans; i++) { + if (d40_alloc_mask_set(&phys[i], is_src, + 0, is_log, + first_phy_user)) + goto found_phy; + } + } + } else + for (j = 0; j < d40c->base->num_phy_chans; j += 8) { + int phy_num = j + event_group * 2; + for (i = phy_num; i < phy_num + 2; i++) { + if (d40_alloc_mask_set(&phys[i], + is_src, + 0, + is_log, + first_phy_user)) + goto found_phy; + } + } + return -EINVAL; +found_phy: + d40c->phy_chan = &phys[i]; + d40c->log_num = D40_PHY_CHAN; + goto out; + } + if (dev_type == -1) + return -EINVAL; + + /* Find logical channel */ + for (j = 0; j < d40c->base->num_phy_chans; j += 8) { + int phy_num = j + event_group * 2; + + if (d40c->dma_cfg.use_fixed_channel) { + i = d40c->dma_cfg.phy_channel; + + if ((i != phy_num) && (i != phy_num + 1)) { + dev_err(chan2dev(d40c), + "invalid fixed phy channel %d\n", i); + return -EINVAL; + } + + if (d40_alloc_mask_set(&phys[i], is_src, event_line, + is_log, first_phy_user)) + goto found_log; + + dev_err(chan2dev(d40c), + "could not allocate fixed phy channel %d\n", i); + return -EINVAL; + } + + /* + * Spread logical channels across all available physical rather + * than pack every logical channel at the first available phy + * channels. + */ + if (is_src) { + for (i = phy_num; i < phy_num + 2; i++) { + if (d40_alloc_mask_set(&phys[i], is_src, + event_line, is_log, + first_phy_user)) + goto found_log; + } + } else { + for (i = phy_num + 1; i >= phy_num; i--) { + if (d40_alloc_mask_set(&phys[i], is_src, + event_line, is_log, + first_phy_user)) + goto found_log; + } + } + } + return -EINVAL; + +found_log: + d40c->phy_chan = &phys[i]; + d40c->log_num = log_num; +out: + + if (is_log) + d40c->base->lookup_log_chans[d40c->log_num] = d40c; + else + d40c->base->lookup_phy_chans[d40c->phy_chan->num] = d40c; + + return 0; + +} + +static int d40_config_memcpy(struct d40_chan *d40c) +{ + dma_cap_mask_t cap = d40c->chan.device->cap_mask; + + if (dma_has_cap(DMA_MEMCPY, cap) && !dma_has_cap(DMA_SLAVE, cap)) { + d40c->dma_cfg = dma40_memcpy_conf_log; + d40c->dma_cfg.dev_type = dma40_memcpy_channels[d40c->chan.chan_id]; + + d40_log_cfg(&d40c->dma_cfg, + &d40c->log_def.lcsp1, &d40c->log_def.lcsp3); + + } else if (dma_has_cap(DMA_MEMCPY, cap) && + dma_has_cap(DMA_SLAVE, cap)) { + d40c->dma_cfg = dma40_memcpy_conf_phy; + + /* Generate interrrupt at end of transfer or relink. */ + d40c->dst_def_cfg |= BIT(D40_SREG_CFG_TIM_POS); + + /* Generate interrupt on error. */ + d40c->src_def_cfg |= BIT(D40_SREG_CFG_EIM_POS); + d40c->dst_def_cfg |= BIT(D40_SREG_CFG_EIM_POS); + + } else { + chan_err(d40c, "No memcpy\n"); + return -EINVAL; + } + + return 0; +} + +static int d40_free_dma(struct d40_chan *d40c) +{ + + int res = 0; + u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type); + struct d40_phy_res *phy = d40c->phy_chan; + bool is_src; + + /* Terminate all queued and active transfers */ + d40_term_all(d40c); + + if (phy == NULL) { + chan_err(d40c, "phy == null\n"); + return -EINVAL; + } + + if (phy->allocated_src == D40_ALLOC_FREE && + phy->allocated_dst == D40_ALLOC_FREE) { + chan_err(d40c, "channel already free\n"); + return -EINVAL; + } + + if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV || + d40c->dma_cfg.dir == DMA_MEM_TO_MEM) + is_src = false; + else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) + is_src = true; + else { + chan_err(d40c, "Unknown direction\n"); + return -EINVAL; + } + + pm_runtime_get_sync(d40c->base->dev); + res = d40_channel_execute_command(d40c, D40_DMA_STOP); + if (res) { + chan_err(d40c, "stop failed\n"); + goto out; + } + + d40_alloc_mask_free(phy, is_src, chan_is_logical(d40c) ? event : 0); + + if (chan_is_logical(d40c)) + d40c->base->lookup_log_chans[d40c->log_num] = NULL; + else + d40c->base->lookup_phy_chans[phy->num] = NULL; + + if (d40c->busy) { + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + } + + d40c->busy = false; + d40c->phy_chan = NULL; + d40c->configured = false; +out: + + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + return res; +} + +static bool d40_is_paused(struct d40_chan *d40c) +{ + void __iomem *chanbase = chan_base(d40c); + bool is_paused = false; + unsigned long flags; + void __iomem *active_reg; + u32 status; + u32 event = D40_TYPE_TO_EVENT(d40c->dma_cfg.dev_type); + + spin_lock_irqsave(&d40c->lock, flags); + + if (chan_is_physical(d40c)) { + if (d40c->phy_chan->num % 2 == 0) + active_reg = d40c->base->virtbase + D40_DREG_ACTIVE; + else + active_reg = d40c->base->virtbase + D40_DREG_ACTIVO; + + status = (readl(active_reg) & + D40_CHAN_POS_MASK(d40c->phy_chan->num)) >> + D40_CHAN_POS(d40c->phy_chan->num); + if (status == D40_DMA_SUSPENDED || status == D40_DMA_STOP) + is_paused = true; + + goto _exit; + } + + if (d40c->dma_cfg.dir == DMA_MEM_TO_DEV || + d40c->dma_cfg.dir == DMA_MEM_TO_MEM) { + status = readl(chanbase + D40_CHAN_REG_SDLNK); + } else if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) { + status = readl(chanbase + D40_CHAN_REG_SSLNK); + } else { + chan_err(d40c, "Unknown direction\n"); + goto _exit; + } + + status = (status & D40_EVENTLINE_MASK(event)) >> + D40_EVENTLINE_POS(event); + + if (status != D40_DMA_RUN) + is_paused = true; +_exit: + spin_unlock_irqrestore(&d40c->lock, flags); + return is_paused; + +} + +static u32 stedma40_residue(struct dma_chan *chan) +{ + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + u32 bytes_left; + unsigned long flags; + + spin_lock_irqsave(&d40c->lock, flags); + bytes_left = d40_residue(d40c); + spin_unlock_irqrestore(&d40c->lock, flags); + + return bytes_left; +} + +static int +d40_prep_sg_log(struct d40_chan *chan, struct d40_desc *desc, + struct scatterlist *sg_src, struct scatterlist *sg_dst, + unsigned int sg_len, dma_addr_t src_dev_addr, + dma_addr_t dst_dev_addr) +{ + struct stedma40_chan_cfg *cfg = &chan->dma_cfg; + struct stedma40_half_channel_info *src_info = &cfg->src_info; + struct stedma40_half_channel_info *dst_info = &cfg->dst_info; + int ret; + + ret = d40_log_sg_to_lli(sg_src, sg_len, + src_dev_addr, + desc->lli_log.src, + chan->log_def.lcsp1, + src_info->data_width, + dst_info->data_width); + + ret = d40_log_sg_to_lli(sg_dst, sg_len, + dst_dev_addr, + desc->lli_log.dst, + chan->log_def.lcsp3, + dst_info->data_width, + src_info->data_width); + + return ret < 0 ? ret : 0; +} + +static int +d40_prep_sg_phy(struct d40_chan *chan, struct d40_desc *desc, + struct scatterlist *sg_src, struct scatterlist *sg_dst, + unsigned int sg_len, dma_addr_t src_dev_addr, + dma_addr_t dst_dev_addr) +{ + struct stedma40_chan_cfg *cfg = &chan->dma_cfg; + struct stedma40_half_channel_info *src_info = &cfg->src_info; + struct stedma40_half_channel_info *dst_info = &cfg->dst_info; + unsigned long flags = 0; + int ret; + + if (desc->cyclic) + flags |= LLI_CYCLIC | LLI_TERM_INT; + + ret = d40_phy_sg_to_lli(sg_src, sg_len, src_dev_addr, + desc->lli_phy.src, + virt_to_phys(desc->lli_phy.src), + chan->src_def_cfg, + src_info, dst_info, flags); + + ret = d40_phy_sg_to_lli(sg_dst, sg_len, dst_dev_addr, + desc->lli_phy.dst, + virt_to_phys(desc->lli_phy.dst), + chan->dst_def_cfg, + dst_info, src_info, flags); + + dma_sync_single_for_device(chan->base->dev, desc->lli_pool.dma_addr, + desc->lli_pool.size, DMA_TO_DEVICE); + + return ret < 0 ? ret : 0; +} + +static struct d40_desc * +d40_prep_desc(struct d40_chan *chan, struct scatterlist *sg, + unsigned int sg_len, unsigned long dma_flags) +{ + struct stedma40_chan_cfg *cfg = &chan->dma_cfg; + struct d40_desc *desc; + int ret; + + desc = d40_desc_get(chan); + if (!desc) + return NULL; + + desc->lli_len = d40_sg_2_dmalen(sg, sg_len, cfg->src_info.data_width, + cfg->dst_info.data_width); + if (desc->lli_len < 0) { + chan_err(chan, "Unaligned size\n"); + goto err; + } + + ret = d40_pool_lli_alloc(chan, desc, desc->lli_len); + if (ret < 0) { + chan_err(chan, "Could not allocate lli\n"); + goto err; + } + + desc->lli_current = 0; + desc->txd.flags = dma_flags; + desc->txd.tx_submit = d40_tx_submit; + + dma_async_tx_descriptor_init(&desc->txd, &chan->chan); + + return desc; + +err: + d40_desc_free(chan, desc); + return NULL; +} + +static struct dma_async_tx_descriptor * +d40_prep_sg(struct dma_chan *dchan, struct scatterlist *sg_src, + struct scatterlist *sg_dst, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long dma_flags) +{ + struct d40_chan *chan = container_of(dchan, struct d40_chan, chan); + dma_addr_t src_dev_addr = 0; + dma_addr_t dst_dev_addr = 0; + struct d40_desc *desc; + unsigned long flags; + int ret; + + if (!chan->phy_chan) { + chan_err(chan, "Cannot prepare unallocated channel\n"); + return NULL; + } + + spin_lock_irqsave(&chan->lock, flags); + + desc = d40_prep_desc(chan, sg_src, sg_len, dma_flags); + if (desc == NULL) + goto err; + + if (sg_next(&sg_src[sg_len - 1]) == sg_src) + desc->cyclic = true; + + if (direction == DMA_DEV_TO_MEM) + src_dev_addr = chan->runtime_addr; + else if (direction == DMA_MEM_TO_DEV) + dst_dev_addr = chan->runtime_addr; + + if (chan_is_logical(chan)) + ret = d40_prep_sg_log(chan, desc, sg_src, sg_dst, + sg_len, src_dev_addr, dst_dev_addr); + else + ret = d40_prep_sg_phy(chan, desc, sg_src, sg_dst, + sg_len, src_dev_addr, dst_dev_addr); + + if (ret) { + chan_err(chan, "Failed to prepare %s sg job: %d\n", + chan_is_logical(chan) ? "log" : "phy", ret); + goto err; + } + + /* + * add descriptor to the prepare queue in order to be able + * to free them later in terminate_all + */ + list_add_tail(&desc->node, &chan->prepare_queue); + + spin_unlock_irqrestore(&chan->lock, flags); + + return &desc->txd; + +err: + if (desc) + d40_desc_free(chan, desc); + spin_unlock_irqrestore(&chan->lock, flags); + return NULL; +} + +bool stedma40_filter(struct dma_chan *chan, void *data) +{ + struct stedma40_chan_cfg *info = data; + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + int err; + + if (data) { + err = d40_validate_conf(d40c, info); + if (!err) + d40c->dma_cfg = *info; + } else + err = d40_config_memcpy(d40c); + + if (!err) + d40c->configured = true; + + return err == 0; +} +EXPORT_SYMBOL(stedma40_filter); + +static void __d40_set_prio_rt(struct d40_chan *d40c, int dev_type, bool src) +{ + bool realtime = d40c->dma_cfg.realtime; + bool highprio = d40c->dma_cfg.high_priority; + u32 rtreg; + u32 event = D40_TYPE_TO_EVENT(dev_type); + u32 group = D40_TYPE_TO_GROUP(dev_type); + u32 bit = BIT(event); + u32 prioreg; + struct d40_gen_dmac *dmac = &d40c->base->gen_dmac; + + rtreg = realtime ? dmac->realtime_en : dmac->realtime_clear; + /* + * Due to a hardware bug, in some cases a logical channel triggered by + * a high priority destination event line can generate extra packet + * transactions. + * + * The workaround is to not set the high priority level for the + * destination event lines that trigger logical channels. + */ + if (!src && chan_is_logical(d40c)) + highprio = false; + + prioreg = highprio ? dmac->high_prio_en : dmac->high_prio_clear; + + /* Destination event lines are stored in the upper halfword */ + if (!src) + bit <<= 16; + + writel(bit, d40c->base->virtbase + prioreg + group * 4); + writel(bit, d40c->base->virtbase + rtreg + group * 4); +} + +static void d40_set_prio_realtime(struct d40_chan *d40c) +{ + if (d40c->base->rev < 3) + return; + + if ((d40c->dma_cfg.dir == DMA_DEV_TO_MEM) || + (d40c->dma_cfg.dir == DMA_DEV_TO_DEV)) + __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, true); + + if ((d40c->dma_cfg.dir == DMA_MEM_TO_DEV) || + (d40c->dma_cfg.dir == DMA_DEV_TO_DEV)) + __d40_set_prio_rt(d40c, d40c->dma_cfg.dev_type, false); +} + +#define D40_DT_FLAGS_MODE(flags) ((flags >> 0) & 0x1) +#define D40_DT_FLAGS_DIR(flags) ((flags >> 1) & 0x1) +#define D40_DT_FLAGS_BIG_ENDIAN(flags) ((flags >> 2) & 0x1) +#define D40_DT_FLAGS_FIXED_CHAN(flags) ((flags >> 3) & 0x1) +#define D40_DT_FLAGS_HIGH_PRIO(flags) ((flags >> 4) & 0x1) + +static struct dma_chan *d40_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct stedma40_chan_cfg cfg; + dma_cap_mask_t cap; + u32 flags; + + memset(&cfg, 0, sizeof(struct stedma40_chan_cfg)); + + dma_cap_zero(cap); + dma_cap_set(DMA_SLAVE, cap); + + cfg.dev_type = dma_spec->args[0]; + flags = dma_spec->args[2]; + + switch (D40_DT_FLAGS_MODE(flags)) { + case 0: cfg.mode = STEDMA40_MODE_LOGICAL; break; + case 1: cfg.mode = STEDMA40_MODE_PHYSICAL; break; + } + + switch (D40_DT_FLAGS_DIR(flags)) { + case 0: + cfg.dir = DMA_MEM_TO_DEV; + cfg.dst_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags); + break; + case 1: + cfg.dir = DMA_DEV_TO_MEM; + cfg.src_info.big_endian = D40_DT_FLAGS_BIG_ENDIAN(flags); + break; + } + + if (D40_DT_FLAGS_FIXED_CHAN(flags)) { + cfg.phy_channel = dma_spec->args[1]; + cfg.use_fixed_channel = true; + } + + if (D40_DT_FLAGS_HIGH_PRIO(flags)) + cfg.high_priority = true; + + return dma_request_channel(cap, stedma40_filter, &cfg); +} + +/* DMA ENGINE functions */ +static int d40_alloc_chan_resources(struct dma_chan *chan) +{ + int err; + unsigned long flags; + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + bool is_free_phy; + spin_lock_irqsave(&d40c->lock, flags); + + dma_cookie_init(chan); + + /* If no dma configuration is set use default configuration (memcpy) */ + if (!d40c->configured) { + err = d40_config_memcpy(d40c); + if (err) { + chan_err(d40c, "Failed to configure memcpy channel\n"); + goto fail; + } + } + + err = d40_allocate_channel(d40c, &is_free_phy); + if (err) { + chan_err(d40c, "Failed to allocate channel\n"); + d40c->configured = false; + goto fail; + } + + pm_runtime_get_sync(d40c->base->dev); + + d40_set_prio_realtime(d40c); + + if (chan_is_logical(d40c)) { + if (d40c->dma_cfg.dir == DMA_DEV_TO_MEM) + d40c->lcpa = d40c->base->lcpa_base + + d40c->dma_cfg.dev_type * D40_LCPA_CHAN_SIZE; + else + d40c->lcpa = d40c->base->lcpa_base + + d40c->dma_cfg.dev_type * + D40_LCPA_CHAN_SIZE + D40_LCPA_CHAN_DST_DELTA; + + /* Unmask the Global Interrupt Mask. */ + d40c->src_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS); + d40c->dst_def_cfg |= BIT(D40_SREG_CFG_LOG_GIM_POS); + } + + dev_dbg(chan2dev(d40c), "allocated %s channel (phy %d%s)\n", + chan_is_logical(d40c) ? "logical" : "physical", + d40c->phy_chan->num, + d40c->dma_cfg.use_fixed_channel ? ", fixed" : ""); + + + /* + * Only write channel configuration to the DMA if the physical + * resource is free. In case of multiple logical channels + * on the same physical resource, only the first write is necessary. + */ + if (is_free_phy) + d40_config_write(d40c); +fail: + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + spin_unlock_irqrestore(&d40c->lock, flags); + return err; +} + +static void d40_free_chan_resources(struct dma_chan *chan) +{ + struct d40_chan *d40c = + container_of(chan, struct d40_chan, chan); + int err; + unsigned long flags; + + if (d40c->phy_chan == NULL) { + chan_err(d40c, "Cannot free unallocated channel\n"); + return; + } + + spin_lock_irqsave(&d40c->lock, flags); + + err = d40_free_dma(d40c); + + if (err) + chan_err(d40c, "Failed to free channel\n"); + spin_unlock_irqrestore(&d40c->lock, flags); +} + +static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan, + dma_addr_t dst, + dma_addr_t src, + size_t size, + unsigned long dma_flags) +{ + struct scatterlist dst_sg; + struct scatterlist src_sg; + + sg_init_table(&dst_sg, 1); + sg_init_table(&src_sg, 1); + + sg_dma_address(&dst_sg) = dst; + sg_dma_address(&src_sg) = src; + + sg_dma_len(&dst_sg) = size; + sg_dma_len(&src_sg) = size; + + return d40_prep_sg(chan, &src_sg, &dst_sg, 1, + DMA_MEM_TO_MEM, dma_flags); +} + +static struct dma_async_tx_descriptor * +d40_prep_memcpy_sg(struct dma_chan *chan, + struct scatterlist *dst_sg, unsigned int dst_nents, + struct scatterlist *src_sg, unsigned int src_nents, + unsigned long dma_flags) +{ + if (dst_nents != src_nents) + return NULL; + + return d40_prep_sg(chan, src_sg, dst_sg, src_nents, + DMA_MEM_TO_MEM, dma_flags); +} + +static struct dma_async_tx_descriptor * +d40_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long dma_flags, void *context) +{ + if (!is_slave_direction(direction)) + return NULL; + + return d40_prep_sg(chan, sgl, sgl, sg_len, direction, dma_flags); +} + +static struct dma_async_tx_descriptor * +dma40_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr, + size_t buf_len, size_t period_len, + enum dma_transfer_direction direction, unsigned long flags) +{ + unsigned int periods = buf_len / period_len; + struct dma_async_tx_descriptor *txd; + struct scatterlist *sg; + int i; + + sg = kcalloc(periods + 1, sizeof(struct scatterlist), GFP_NOWAIT); + if (!sg) + return NULL; + + for (i = 0; i < periods; i++) { + sg_dma_address(&sg[i]) = dma_addr; + sg_dma_len(&sg[i]) = period_len; + dma_addr += period_len; + } + + sg[periods].offset = 0; + sg_dma_len(&sg[periods]) = 0; + sg[periods].page_link = + ((unsigned long)sg | 0x01) & ~0x02; + + txd = d40_prep_sg(chan, sg, sg, periods, direction, + DMA_PREP_INTERRUPT); + + kfree(sg); + + return txd; +} + +static enum dma_status d40_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + enum dma_status ret; + + if (d40c->phy_chan == NULL) { + chan_err(d40c, "Cannot read status of unallocated channel\n"); + return -EINVAL; + } + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret != DMA_COMPLETE) + dma_set_residue(txstate, stedma40_residue(chan)); + + if (d40_is_paused(d40c)) + ret = DMA_PAUSED; + + return ret; +} + +static void d40_issue_pending(struct dma_chan *chan) +{ + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + unsigned long flags; + + if (d40c->phy_chan == NULL) { + chan_err(d40c, "Channel is not allocated!\n"); + return; + } + + spin_lock_irqsave(&d40c->lock, flags); + + list_splice_tail_init(&d40c->pending_queue, &d40c->queue); + + /* Busy means that queued jobs are already being processed */ + if (!d40c->busy) + (void) d40_queue_start(d40c); + + spin_unlock_irqrestore(&d40c->lock, flags); +} + +static int d40_terminate_all(struct dma_chan *chan) +{ + unsigned long flags; + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + int ret; + + if (d40c->phy_chan == NULL) { + chan_err(d40c, "Channel is not allocated!\n"); + return -EINVAL; + } + + spin_lock_irqsave(&d40c->lock, flags); + + pm_runtime_get_sync(d40c->base->dev); + ret = d40_channel_execute_command(d40c, D40_DMA_STOP); + if (ret) + chan_err(d40c, "Failed to stop channel\n"); + + d40_term_all(d40c); + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + if (d40c->busy) { + pm_runtime_mark_last_busy(d40c->base->dev); + pm_runtime_put_autosuspend(d40c->base->dev); + } + d40c->busy = false; + + spin_unlock_irqrestore(&d40c->lock, flags); + return 0; +} + +static int +dma40_config_to_halfchannel(struct d40_chan *d40c, + struct stedma40_half_channel_info *info, + u32 maxburst) +{ + int psize; + + if (chan_is_logical(d40c)) { + if (maxburst >= 16) + psize = STEDMA40_PSIZE_LOG_16; + else if (maxburst >= 8) + psize = STEDMA40_PSIZE_LOG_8; + else if (maxburst >= 4) + psize = STEDMA40_PSIZE_LOG_4; + else + psize = STEDMA40_PSIZE_LOG_1; + } else { + if (maxburst >= 16) + psize = STEDMA40_PSIZE_PHY_16; + else if (maxburst >= 8) + psize = STEDMA40_PSIZE_PHY_8; + else if (maxburst >= 4) + psize = STEDMA40_PSIZE_PHY_4; + else + psize = STEDMA40_PSIZE_PHY_1; + } + + info->psize = psize; + info->flow_ctrl = STEDMA40_NO_FLOW_CTRL; + + return 0; +} + +/* Runtime reconfiguration extension */ +static int d40_set_runtime_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + struct stedma40_chan_cfg *cfg = &d40c->dma_cfg; + enum dma_slave_buswidth src_addr_width, dst_addr_width; + dma_addr_t config_addr; + u32 src_maxburst, dst_maxburst; + int ret; + + if (d40c->phy_chan == NULL) { + chan_err(d40c, "Channel is not allocated!\n"); + return -EINVAL; + } + + src_addr_width = config->src_addr_width; + src_maxburst = config->src_maxburst; + dst_addr_width = config->dst_addr_width; + dst_maxburst = config->dst_maxburst; + + if (config->direction == DMA_DEV_TO_MEM) { + config_addr = config->src_addr; + + if (cfg->dir != DMA_DEV_TO_MEM) + dev_dbg(d40c->base->dev, + "channel was not configured for peripheral " + "to memory transfer (%d) overriding\n", + cfg->dir); + cfg->dir = DMA_DEV_TO_MEM; + + /* Configure the memory side */ + if (dst_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) + dst_addr_width = src_addr_width; + if (dst_maxburst == 0) + dst_maxburst = src_maxburst; + + } else if (config->direction == DMA_MEM_TO_DEV) { + config_addr = config->dst_addr; + + if (cfg->dir != DMA_MEM_TO_DEV) + dev_dbg(d40c->base->dev, + "channel was not configured for memory " + "to peripheral transfer (%d) overriding\n", + cfg->dir); + cfg->dir = DMA_MEM_TO_DEV; + + /* Configure the memory side */ + if (src_addr_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) + src_addr_width = dst_addr_width; + if (src_maxburst == 0) + src_maxburst = dst_maxburst; + } else { + dev_err(d40c->base->dev, + "unrecognized channel direction %d\n", + config->direction); + return -EINVAL; + } + + if (config_addr <= 0) { + dev_err(d40c->base->dev, "no address supplied\n"); + return -EINVAL; + } + + if (src_maxburst * src_addr_width != dst_maxburst * dst_addr_width) { + dev_err(d40c->base->dev, + "src/dst width/maxburst mismatch: %d*%d != %d*%d\n", + src_maxburst, + src_addr_width, + dst_maxburst, + dst_addr_width); + return -EINVAL; + } + + if (src_maxburst > 16) { + src_maxburst = 16; + dst_maxburst = src_maxburst * src_addr_width / dst_addr_width; + } else if (dst_maxburst > 16) { + dst_maxburst = 16; + src_maxburst = dst_maxburst * dst_addr_width / src_addr_width; + } + + /* Only valid widths are; 1, 2, 4 and 8. */ + if (src_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED || + src_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES || + dst_addr_width <= DMA_SLAVE_BUSWIDTH_UNDEFINED || + dst_addr_width > DMA_SLAVE_BUSWIDTH_8_BYTES || + !is_power_of_2(src_addr_width) || + !is_power_of_2(dst_addr_width)) + return -EINVAL; + + cfg->src_info.data_width = src_addr_width; + cfg->dst_info.data_width = dst_addr_width; + + ret = dma40_config_to_halfchannel(d40c, &cfg->src_info, + src_maxburst); + if (ret) + return ret; + + ret = dma40_config_to_halfchannel(d40c, &cfg->dst_info, + dst_maxburst); + if (ret) + return ret; + + /* Fill in register values */ + if (chan_is_logical(d40c)) + d40_log_cfg(cfg, &d40c->log_def.lcsp1, &d40c->log_def.lcsp3); + else + d40_phy_cfg(cfg, &d40c->src_def_cfg, &d40c->dst_def_cfg); + + /* These settings will take precedence later */ + d40c->runtime_addr = config_addr; + d40c->runtime_direction = config->direction; + dev_dbg(d40c->base->dev, + "configured channel %s for %s, data width %d/%d, " + "maxburst %d/%d elements, LE, no flow control\n", + dma_chan_name(chan), + (config->direction == DMA_DEV_TO_MEM) ? "RX" : "TX", + src_addr_width, dst_addr_width, + src_maxburst, dst_maxburst); + + return 0; +} + +/* Initialization functions */ + +static void __init d40_chan_init(struct d40_base *base, struct dma_device *dma, + struct d40_chan *chans, int offset, + int num_chans) +{ + int i = 0; + struct d40_chan *d40c; + + INIT_LIST_HEAD(&dma->channels); + + for (i = offset; i < offset + num_chans; i++) { + d40c = &chans[i]; + d40c->base = base; + d40c->chan.device = dma; + + spin_lock_init(&d40c->lock); + + d40c->log_num = D40_PHY_CHAN; + + INIT_LIST_HEAD(&d40c->done); + INIT_LIST_HEAD(&d40c->active); + INIT_LIST_HEAD(&d40c->queue); + INIT_LIST_HEAD(&d40c->pending_queue); + INIT_LIST_HEAD(&d40c->client); + INIT_LIST_HEAD(&d40c->prepare_queue); + + tasklet_init(&d40c->tasklet, dma_tasklet, + (unsigned long) d40c); + + list_add_tail(&d40c->chan.device_node, + &dma->channels); + } +} + +static void d40_ops_init(struct d40_base *base, struct dma_device *dev) +{ + if (dma_has_cap(DMA_SLAVE, dev->cap_mask)) + dev->device_prep_slave_sg = d40_prep_slave_sg; + + if (dma_has_cap(DMA_MEMCPY, dev->cap_mask)) { + dev->device_prep_dma_memcpy = d40_prep_memcpy; + + /* + * This controller can only access address at even + * 32bit boundaries, i.e. 2^2 + */ + dev->copy_align = 2; + } + + if (dma_has_cap(DMA_SG, dev->cap_mask)) + dev->device_prep_dma_sg = d40_prep_memcpy_sg; + + if (dma_has_cap(DMA_CYCLIC, dev->cap_mask)) + dev->device_prep_dma_cyclic = dma40_prep_dma_cyclic; + + dev->device_alloc_chan_resources = d40_alloc_chan_resources; + dev->device_free_chan_resources = d40_free_chan_resources; + dev->device_issue_pending = d40_issue_pending; + dev->device_tx_status = d40_tx_status; + dev->device_config = d40_set_runtime_config; + dev->device_pause = d40_pause; + dev->device_resume = d40_resume; + dev->device_terminate_all = d40_terminate_all; + dev->dev = base->dev; +} + +static int __init d40_dmaengine_init(struct d40_base *base, + int num_reserved_chans) +{ + int err ; + + d40_chan_init(base, &base->dma_slave, base->log_chans, + 0, base->num_log_chans); + + dma_cap_zero(base->dma_slave.cap_mask); + dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask); + dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask); + + d40_ops_init(base, &base->dma_slave); + + err = dma_async_device_register(&base->dma_slave); + + if (err) { + d40_err(base->dev, "Failed to register slave channels\n"); + goto failure1; + } + + d40_chan_init(base, &base->dma_memcpy, base->log_chans, + base->num_log_chans, base->num_memcpy_chans); + + dma_cap_zero(base->dma_memcpy.cap_mask); + dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask); + dma_cap_set(DMA_SG, base->dma_memcpy.cap_mask); + + d40_ops_init(base, &base->dma_memcpy); + + err = dma_async_device_register(&base->dma_memcpy); + + if (err) { + d40_err(base->dev, + "Failed to regsiter memcpy only channels\n"); + goto failure2; + } + + d40_chan_init(base, &base->dma_both, base->phy_chans, + 0, num_reserved_chans); + + dma_cap_zero(base->dma_both.cap_mask); + dma_cap_set(DMA_SLAVE, base->dma_both.cap_mask); + dma_cap_set(DMA_MEMCPY, base->dma_both.cap_mask); + dma_cap_set(DMA_SG, base->dma_both.cap_mask); + dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask); + + d40_ops_init(base, &base->dma_both); + err = dma_async_device_register(&base->dma_both); + + if (err) { + d40_err(base->dev, + "Failed to register logical and physical capable channels\n"); + goto failure3; + } + return 0; +failure3: + dma_async_device_unregister(&base->dma_memcpy); +failure2: + dma_async_device_unregister(&base->dma_slave); +failure1: + return err; +} + +/* Suspend resume functionality */ +#ifdef CONFIG_PM_SLEEP +static int dma40_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct d40_base *base = platform_get_drvdata(pdev); + int ret; + + ret = pm_runtime_force_suspend(dev); + if (ret) + return ret; + + if (base->lcpa_regulator) + ret = regulator_disable(base->lcpa_regulator); + return ret; +} + +static int dma40_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct d40_base *base = platform_get_drvdata(pdev); + int ret = 0; + + if (base->lcpa_regulator) { + ret = regulator_enable(base->lcpa_regulator); + if (ret) + return ret; + } + + return pm_runtime_force_resume(dev); +} +#endif + +#ifdef CONFIG_PM +static void dma40_backup(void __iomem *baseaddr, u32 *backup, + u32 *regaddr, int num, bool save) +{ + int i; + + for (i = 0; i < num; i++) { + void __iomem *addr = baseaddr + regaddr[i]; + + if (save) + backup[i] = readl_relaxed(addr); + else + writel_relaxed(backup[i], addr); + } +} + +static void d40_save_restore_registers(struct d40_base *base, bool save) +{ + int i; + + /* Save/Restore channel specific registers */ + for (i = 0; i < base->num_phy_chans; i++) { + void __iomem *addr; + int idx; + + if (base->phy_res[i].reserved) + continue; + + addr = base->virtbase + D40_DREG_PCBASE + i * D40_DREG_PCDELTA; + idx = i * ARRAY_SIZE(d40_backup_regs_chan); + + dma40_backup(addr, &base->reg_val_backup_chan[idx], + d40_backup_regs_chan, + ARRAY_SIZE(d40_backup_regs_chan), + save); + } + + /* Save/Restore global registers */ + dma40_backup(base->virtbase, base->reg_val_backup, + d40_backup_regs, ARRAY_SIZE(d40_backup_regs), + save); + + /* Save/Restore registers only existing on dma40 v3 and later */ + if (base->gen_dmac.backup) + dma40_backup(base->virtbase, base->reg_val_backup_v4, + base->gen_dmac.backup, + base->gen_dmac.backup_size, + save); +} + +static int dma40_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct d40_base *base = platform_get_drvdata(pdev); + + d40_save_restore_registers(base, true); + + /* Don't disable/enable clocks for v1 due to HW bugs */ + if (base->rev != 1) + writel_relaxed(base->gcc_pwr_off_mask, + base->virtbase + D40_DREG_GCC); + + return 0; +} + +static int dma40_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct d40_base *base = platform_get_drvdata(pdev); + + d40_save_restore_registers(base, false); + + writel_relaxed(D40_DREG_GCC_ENABLE_ALL, + base->virtbase + D40_DREG_GCC); + return 0; +} +#endif + +static const struct dev_pm_ops dma40_pm_ops = { + SET_LATE_SYSTEM_SLEEP_PM_OPS(dma40_suspend, dma40_resume) + SET_RUNTIME_PM_OPS(dma40_runtime_suspend, + dma40_runtime_resume, + NULL) +}; + +/* Initialization functions. */ + +static int __init d40_phy_res_init(struct d40_base *base) +{ + int i; + int num_phy_chans_avail = 0; + u32 val[2]; + int odd_even_bit = -2; + int gcc = D40_DREG_GCC_ENA; + + val[0] = readl(base->virtbase + D40_DREG_PRSME); + val[1] = readl(base->virtbase + D40_DREG_PRSMO); + + for (i = 0; i < base->num_phy_chans; i++) { + base->phy_res[i].num = i; + odd_even_bit += 2 * ((i % 2) == 0); + if (((val[i % 2] >> odd_even_bit) & 3) == 1) { + /* Mark security only channels as occupied */ + base->phy_res[i].allocated_src = D40_ALLOC_PHY; + base->phy_res[i].allocated_dst = D40_ALLOC_PHY; + base->phy_res[i].reserved = true; + gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i), + D40_DREG_GCC_SRC); + gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(i), + D40_DREG_GCC_DST); + + + } else { + base->phy_res[i].allocated_src = D40_ALLOC_FREE; + base->phy_res[i].allocated_dst = D40_ALLOC_FREE; + base->phy_res[i].reserved = false; + num_phy_chans_avail++; + } + spin_lock_init(&base->phy_res[i].lock); + } + + /* Mark disabled channels as occupied */ + for (i = 0; base->plat_data->disabled_channels[i] != -1; i++) { + int chan = base->plat_data->disabled_channels[i]; + + base->phy_res[chan].allocated_src = D40_ALLOC_PHY; + base->phy_res[chan].allocated_dst = D40_ALLOC_PHY; + base->phy_res[chan].reserved = true; + gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan), + D40_DREG_GCC_SRC); + gcc |= D40_DREG_GCC_EVTGRP_ENA(D40_PHYS_TO_GROUP(chan), + D40_DREG_GCC_DST); + num_phy_chans_avail--; + } + + /* Mark soft_lli channels */ + for (i = 0; i < base->plat_data->num_of_soft_lli_chans; i++) { + int chan = base->plat_data->soft_lli_chans[i]; + + base->phy_res[chan].use_soft_lli = true; + } + + dev_info(base->dev, "%d of %d physical DMA channels available\n", + num_phy_chans_avail, base->num_phy_chans); + + /* Verify settings extended vs standard */ + val[0] = readl(base->virtbase + D40_DREG_PRTYP); + + for (i = 0; i < base->num_phy_chans; i++) { + + if (base->phy_res[i].allocated_src == D40_ALLOC_FREE && + (val[0] & 0x3) != 1) + dev_info(base->dev, + "[%s] INFO: channel %d is misconfigured (%d)\n", + __func__, i, val[0] & 0x3); + + val[0] = val[0] >> 2; + } + + /* + * To keep things simple, Enable all clocks initially. + * The clocks will get managed later post channel allocation. + * The clocks for the event lines on which reserved channels exists + * are not managed here. + */ + writel(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC); + base->gcc_pwr_off_mask = gcc; + + return num_phy_chans_avail; +} + +static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev) +{ + struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev); + struct clk *clk = NULL; + void __iomem *virtbase = NULL; + struct resource *res = NULL; + struct d40_base *base = NULL; + int num_log_chans = 0; + int num_phy_chans; + int num_memcpy_chans; + int clk_ret = -EINVAL; + int i; + u32 pid; + u32 cid; + u8 rev; + + clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) { + d40_err(&pdev->dev, "No matching clock found\n"); + goto failure; + } + + clk_ret = clk_prepare_enable(clk); + if (clk_ret) { + d40_err(&pdev->dev, "Failed to prepare/enable clock\n"); + goto failure; + } + + /* Get IO for DMAC base address */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base"); + if (!res) + goto failure; + + if (request_mem_region(res->start, resource_size(res), + D40_NAME " I/O base") == NULL) + goto failure; + + virtbase = ioremap(res->start, resource_size(res)); + if (!virtbase) + goto failure; + + /* This is just a regular AMBA PrimeCell ID actually */ + for (pid = 0, i = 0; i < 4; i++) + pid |= (readl(virtbase + resource_size(res) - 0x20 + 4 * i) + & 255) << (i * 8); + for (cid = 0, i = 0; i < 4; i++) + cid |= (readl(virtbase + resource_size(res) - 0x10 + 4 * i) + & 255) << (i * 8); + + if (cid != AMBA_CID) { + d40_err(&pdev->dev, "Unknown hardware! No PrimeCell ID\n"); + goto failure; + } + if (AMBA_MANF_BITS(pid) != AMBA_VENDOR_ST) { + d40_err(&pdev->dev, "Unknown designer! Got %x wanted %x\n", + AMBA_MANF_BITS(pid), + AMBA_VENDOR_ST); + goto failure; + } + /* + * HW revision: + * DB8500ed has revision 0 + * ? has revision 1 + * DB8500v1 has revision 2 + * DB8500v2 has revision 3 + * AP9540v1 has revision 4 + * DB8540v1 has revision 4 + */ + rev = AMBA_REV_BITS(pid); + if (rev < 2) { + d40_err(&pdev->dev, "hardware revision: %d is not supported", rev); + goto failure; + } + + /* The number of physical channels on this HW */ + if (plat_data->num_of_phy_chans) + num_phy_chans = plat_data->num_of_phy_chans; + else + num_phy_chans = 4 * (readl(virtbase + D40_DREG_ICFG) & 0x7) + 4; + + /* The number of channels used for memcpy */ + if (plat_data->num_of_memcpy_chans) + num_memcpy_chans = plat_data->num_of_memcpy_chans; + else + num_memcpy_chans = ARRAY_SIZE(dma40_memcpy_channels); + + num_log_chans = num_phy_chans * D40_MAX_LOG_CHAN_PER_PHY; + + dev_info(&pdev->dev, + "hardware rev: %d @ %pa with %d physical and %d logical channels\n", + rev, &res->start, num_phy_chans, num_log_chans); + + base = kzalloc(ALIGN(sizeof(struct d40_base), 4) + + (num_phy_chans + num_log_chans + num_memcpy_chans) * + sizeof(struct d40_chan), GFP_KERNEL); + + if (base == NULL) { + d40_err(&pdev->dev, "Out of memory\n"); + goto failure; + } + + base->rev = rev; + base->clk = clk; + base->num_memcpy_chans = num_memcpy_chans; + base->num_phy_chans = num_phy_chans; + base->num_log_chans = num_log_chans; + base->phy_start = res->start; + base->phy_size = resource_size(res); + base->virtbase = virtbase; + base->plat_data = plat_data; + base->dev = &pdev->dev; + base->phy_chans = ((void *)base) + ALIGN(sizeof(struct d40_base), 4); + base->log_chans = &base->phy_chans[num_phy_chans]; + + if (base->plat_data->num_of_phy_chans == 14) { + base->gen_dmac.backup = d40_backup_regs_v4b; + base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4B; + base->gen_dmac.interrupt_en = D40_DREG_CPCMIS; + base->gen_dmac.interrupt_clear = D40_DREG_CPCICR; + base->gen_dmac.realtime_en = D40_DREG_CRSEG1; + base->gen_dmac.realtime_clear = D40_DREG_CRCEG1; + base->gen_dmac.high_prio_en = D40_DREG_CPSEG1; + base->gen_dmac.high_prio_clear = D40_DREG_CPCEG1; + base->gen_dmac.il = il_v4b; + base->gen_dmac.il_size = ARRAY_SIZE(il_v4b); + base->gen_dmac.init_reg = dma_init_reg_v4b; + base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4b); + } else { + if (base->rev >= 3) { + base->gen_dmac.backup = d40_backup_regs_v4a; + base->gen_dmac.backup_size = BACKUP_REGS_SZ_V4A; + } + base->gen_dmac.interrupt_en = D40_DREG_PCMIS; + base->gen_dmac.interrupt_clear = D40_DREG_PCICR; + base->gen_dmac.realtime_en = D40_DREG_RSEG1; + base->gen_dmac.realtime_clear = D40_DREG_RCEG1; + base->gen_dmac.high_prio_en = D40_DREG_PSEG1; + base->gen_dmac.high_prio_clear = D40_DREG_PCEG1; + base->gen_dmac.il = il_v4a; + base->gen_dmac.il_size = ARRAY_SIZE(il_v4a); + base->gen_dmac.init_reg = dma_init_reg_v4a; + base->gen_dmac.init_reg_size = ARRAY_SIZE(dma_init_reg_v4a); + } + + base->phy_res = kzalloc(num_phy_chans * sizeof(struct d40_phy_res), + GFP_KERNEL); + if (!base->phy_res) + goto failure; + + base->lookup_phy_chans = kzalloc(num_phy_chans * + sizeof(struct d40_chan *), + GFP_KERNEL); + if (!base->lookup_phy_chans) + goto failure; + + base->lookup_log_chans = kzalloc(num_log_chans * + sizeof(struct d40_chan *), + GFP_KERNEL); + if (!base->lookup_log_chans) + goto failure; + + base->reg_val_backup_chan = kmalloc(base->num_phy_chans * + sizeof(d40_backup_regs_chan), + GFP_KERNEL); + if (!base->reg_val_backup_chan) + goto failure; + + base->lcla_pool.alloc_map = + kzalloc(num_phy_chans * sizeof(struct d40_desc *) + * D40_LCLA_LINK_PER_EVENT_GRP, GFP_KERNEL); + if (!base->lcla_pool.alloc_map) + goto failure; + + base->desc_slab = kmem_cache_create(D40_NAME, sizeof(struct d40_desc), + 0, SLAB_HWCACHE_ALIGN, + NULL); + if (base->desc_slab == NULL) + goto failure; + + return base; + +failure: + if (!clk_ret) + clk_disable_unprepare(clk); + if (!IS_ERR(clk)) + clk_put(clk); + if (virtbase) + iounmap(virtbase); + if (res) + release_mem_region(res->start, + resource_size(res)); + if (virtbase) + iounmap(virtbase); + + if (base) { + kfree(base->lcla_pool.alloc_map); + kfree(base->reg_val_backup_chan); + kfree(base->lookup_log_chans); + kfree(base->lookup_phy_chans); + kfree(base->phy_res); + kfree(base); + } + + return NULL; +} + +static void __init d40_hw_init(struct d40_base *base) +{ + + int i; + u32 prmseo[2] = {0, 0}; + u32 activeo[2] = {0xFFFFFFFF, 0xFFFFFFFF}; + u32 pcmis = 0; + u32 pcicr = 0; + struct d40_reg_val *dma_init_reg = base->gen_dmac.init_reg; + u32 reg_size = base->gen_dmac.init_reg_size; + + for (i = 0; i < reg_size; i++) + writel(dma_init_reg[i].val, + base->virtbase + dma_init_reg[i].reg); + + /* Configure all our dma channels to default settings */ + for (i = 0; i < base->num_phy_chans; i++) { + + activeo[i % 2] = activeo[i % 2] << 2; + + if (base->phy_res[base->num_phy_chans - i - 1].allocated_src + == D40_ALLOC_PHY) { + activeo[i % 2] |= 3; + continue; + } + + /* Enable interrupt # */ + pcmis = (pcmis << 1) | 1; + + /* Clear interrupt # */ + pcicr = (pcicr << 1) | 1; + + /* Set channel to physical mode */ + prmseo[i % 2] = prmseo[i % 2] << 2; + prmseo[i % 2] |= 1; + + } + + writel(prmseo[1], base->virtbase + D40_DREG_PRMSE); + writel(prmseo[0], base->virtbase + D40_DREG_PRMSO); + writel(activeo[1], base->virtbase + D40_DREG_ACTIVE); + writel(activeo[0], base->virtbase + D40_DREG_ACTIVO); + + /* Write which interrupt to enable */ + writel(pcmis, base->virtbase + base->gen_dmac.interrupt_en); + + /* Write which interrupt to clear */ + writel(pcicr, base->virtbase + base->gen_dmac.interrupt_clear); + + /* These are __initdata and cannot be accessed after init */ + base->gen_dmac.init_reg = NULL; + base->gen_dmac.init_reg_size = 0; +} + +static int __init d40_lcla_allocate(struct d40_base *base) +{ + struct d40_lcla_pool *pool = &base->lcla_pool; + unsigned long *page_list; + int i, j; + int ret = 0; + + /* + * This is somewhat ugly. We need 8192 bytes that are 18 bit aligned, + * To full fill this hardware requirement without wasting 256 kb + * we allocate pages until we get an aligned one. + */ + page_list = kmalloc(sizeof(unsigned long) * MAX_LCLA_ALLOC_ATTEMPTS, + GFP_KERNEL); + + if (!page_list) { + ret = -ENOMEM; + goto failure; + } + + /* Calculating how many pages that are required */ + base->lcla_pool.pages = SZ_1K * base->num_phy_chans / PAGE_SIZE; + + for (i = 0; i < MAX_LCLA_ALLOC_ATTEMPTS; i++) { + page_list[i] = __get_free_pages(GFP_KERNEL, + base->lcla_pool.pages); + if (!page_list[i]) { + + d40_err(base->dev, "Failed to allocate %d pages.\n", + base->lcla_pool.pages); + ret = -ENOMEM; + + for (j = 0; j < i; j++) + free_pages(page_list[j], base->lcla_pool.pages); + goto failure; + } + + if ((virt_to_phys((void *)page_list[i]) & + (LCLA_ALIGNMENT - 1)) == 0) + break; + } + + for (j = 0; j < i; j++) + free_pages(page_list[j], base->lcla_pool.pages); + + if (i < MAX_LCLA_ALLOC_ATTEMPTS) { + base->lcla_pool.base = (void *)page_list[i]; + } else { + /* + * After many attempts and no succees with finding the correct + * alignment, try with allocating a big buffer. + */ + dev_warn(base->dev, + "[%s] Failed to get %d pages @ 18 bit align.\n", + __func__, base->lcla_pool.pages); + base->lcla_pool.base_unaligned = kmalloc(SZ_1K * + base->num_phy_chans + + LCLA_ALIGNMENT, + GFP_KERNEL); + if (!base->lcla_pool.base_unaligned) { + ret = -ENOMEM; + goto failure; + } + + base->lcla_pool.base = PTR_ALIGN(base->lcla_pool.base_unaligned, + LCLA_ALIGNMENT); + } + + pool->dma_addr = dma_map_single(base->dev, pool->base, + SZ_1K * base->num_phy_chans, + DMA_TO_DEVICE); + if (dma_mapping_error(base->dev, pool->dma_addr)) { + pool->dma_addr = 0; + ret = -ENOMEM; + goto failure; + } + + writel(virt_to_phys(base->lcla_pool.base), + base->virtbase + D40_DREG_LCLA); +failure: + kfree(page_list); + return ret; +} + +static int __init d40_of_probe(struct platform_device *pdev, + struct device_node *np) +{ + struct stedma40_platform_data *pdata; + int num_phy = 0, num_memcpy = 0, num_disabled = 0; + const __be32 *list; + + pdata = devm_kzalloc(&pdev->dev, + sizeof(struct stedma40_platform_data), + GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + /* If absent this value will be obtained from h/w. */ + of_property_read_u32(np, "dma-channels", &num_phy); + if (num_phy > 0) + pdata->num_of_phy_chans = num_phy; + + list = of_get_property(np, "memcpy-channels", &num_memcpy); + num_memcpy /= sizeof(*list); + + if (num_memcpy > D40_MEMCPY_MAX_CHANS || num_memcpy <= 0) { + d40_err(&pdev->dev, + "Invalid number of memcpy channels specified (%d)\n", + num_memcpy); + return -EINVAL; + } + pdata->num_of_memcpy_chans = num_memcpy; + + of_property_read_u32_array(np, "memcpy-channels", + dma40_memcpy_channels, + num_memcpy); + + list = of_get_property(np, "disabled-channels", &num_disabled); + num_disabled /= sizeof(*list); + + if (num_disabled >= STEDMA40_MAX_PHYS || num_disabled < 0) { + d40_err(&pdev->dev, + "Invalid number of disabled channels specified (%d)\n", + num_disabled); + return -EINVAL; + } + + of_property_read_u32_array(np, "disabled-channels", + pdata->disabled_channels, + num_disabled); + pdata->disabled_channels[num_disabled] = -1; + + pdev->dev.platform_data = pdata; + + return 0; +} + +static int __init d40_probe(struct platform_device *pdev) +{ + struct stedma40_platform_data *plat_data = dev_get_platdata(&pdev->dev); + struct device_node *np = pdev->dev.of_node; + int ret = -ENOENT; + struct d40_base *base = NULL; + struct resource *res = NULL; + int num_reserved_chans; + u32 val; + + if (!plat_data) { + if (np) { + if (d40_of_probe(pdev, np)) { + ret = -ENOMEM; + goto failure; + } + } else { + d40_err(&pdev->dev, "No pdata or Device Tree provided\n"); + goto failure; + } + } + + base = d40_hw_detect_init(pdev); + if (!base) + goto failure; + + num_reserved_chans = d40_phy_res_init(base); + + platform_set_drvdata(pdev, base); + + spin_lock_init(&base->interrupt_lock); + spin_lock_init(&base->execmd_lock); + + /* Get IO for logical channel parameter address */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "lcpa"); + if (!res) { + ret = -ENOENT; + d40_err(&pdev->dev, "No \"lcpa\" memory resource\n"); + goto failure; + } + base->lcpa_size = resource_size(res); + base->phy_lcpa = res->start; + + if (request_mem_region(res->start, resource_size(res), + D40_NAME " I/O lcpa") == NULL) { + ret = -EBUSY; + d40_err(&pdev->dev, "Failed to request LCPA region %pR\n", res); + goto failure; + } + + /* We make use of ESRAM memory for this. */ + val = readl(base->virtbase + D40_DREG_LCPA); + if (res->start != val && val != 0) { + dev_warn(&pdev->dev, + "[%s] Mismatch LCPA dma 0x%x, def %pa\n", + __func__, val, &res->start); + } else + writel(res->start, base->virtbase + D40_DREG_LCPA); + + base->lcpa_base = ioremap(res->start, resource_size(res)); + if (!base->lcpa_base) { + ret = -ENOMEM; + d40_err(&pdev->dev, "Failed to ioremap LCPA region\n"); + goto failure; + } + /* If lcla has to be located in ESRAM we don't need to allocate */ + if (base->plat_data->use_esram_lcla) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "lcla_esram"); + if (!res) { + ret = -ENOENT; + d40_err(&pdev->dev, + "No \"lcla_esram\" memory resource\n"); + goto failure; + } + base->lcla_pool.base = ioremap(res->start, + resource_size(res)); + if (!base->lcla_pool.base) { + ret = -ENOMEM; + d40_err(&pdev->dev, "Failed to ioremap LCLA region\n"); + goto failure; + } + writel(res->start, base->virtbase + D40_DREG_LCLA); + + } else { + ret = d40_lcla_allocate(base); + if (ret) { + d40_err(&pdev->dev, "Failed to allocate LCLA area\n"); + goto failure; + } + } + + spin_lock_init(&base->lcla_pool.lock); + + base->irq = platform_get_irq(pdev, 0); + + ret = request_irq(base->irq, d40_handle_interrupt, 0, D40_NAME, base); + if (ret) { + d40_err(&pdev->dev, "No IRQ defined\n"); + goto failure; + } + + if (base->plat_data->use_esram_lcla) { + + base->lcpa_regulator = regulator_get(base->dev, "lcla_esram"); + if (IS_ERR(base->lcpa_regulator)) { + d40_err(&pdev->dev, "Failed to get lcpa_regulator\n"); + ret = PTR_ERR(base->lcpa_regulator); + base->lcpa_regulator = NULL; + goto failure; + } + + ret = regulator_enable(base->lcpa_regulator); + if (ret) { + d40_err(&pdev->dev, + "Failed to enable lcpa_regulator\n"); + regulator_put(base->lcpa_regulator); + base->lcpa_regulator = NULL; + goto failure; + } + } + + writel_relaxed(D40_DREG_GCC_ENABLE_ALL, base->virtbase + D40_DREG_GCC); + + pm_runtime_irq_safe(base->dev); + pm_runtime_set_autosuspend_delay(base->dev, DMA40_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(base->dev); + pm_runtime_mark_last_busy(base->dev); + pm_runtime_set_active(base->dev); + pm_runtime_enable(base->dev); + + ret = d40_dmaengine_init(base, num_reserved_chans); + if (ret) + goto failure; + + base->dev->dma_parms = &base->dma_parms; + ret = dma_set_max_seg_size(base->dev, STEDMA40_MAX_SEG_SIZE); + if (ret) { + d40_err(&pdev->dev, "Failed to set dma max seg size\n"); + goto failure; + } + + d40_hw_init(base); + + if (np) { + ret = of_dma_controller_register(np, d40_xlate, NULL); + if (ret) + dev_err(&pdev->dev, + "could not register of_dma_controller\n"); + } + + dev_info(base->dev, "initialized\n"); + return 0; + +failure: + if (base) { + if (base->desc_slab) + kmem_cache_destroy(base->desc_slab); + if (base->virtbase) + iounmap(base->virtbase); + + if (base->lcla_pool.base && base->plat_data->use_esram_lcla) { + iounmap(base->lcla_pool.base); + base->lcla_pool.base = NULL; + } + + if (base->lcla_pool.dma_addr) + dma_unmap_single(base->dev, base->lcla_pool.dma_addr, + SZ_1K * base->num_phy_chans, + DMA_TO_DEVICE); + + if (!base->lcla_pool.base_unaligned && base->lcla_pool.base) + free_pages((unsigned long)base->lcla_pool.base, + base->lcla_pool.pages); + + kfree(base->lcla_pool.base_unaligned); + + if (base->phy_lcpa) + release_mem_region(base->phy_lcpa, + base->lcpa_size); + if (base->phy_start) + release_mem_region(base->phy_start, + base->phy_size); + if (base->clk) { + clk_disable_unprepare(base->clk); + clk_put(base->clk); + } + + if (base->lcpa_regulator) { + regulator_disable(base->lcpa_regulator); + regulator_put(base->lcpa_regulator); + } + + kfree(base->lcla_pool.alloc_map); + kfree(base->lookup_log_chans); + kfree(base->lookup_phy_chans); + kfree(base->phy_res); + kfree(base); + } + + d40_err(&pdev->dev, "probe failed\n"); + return ret; +} + +static const struct of_device_id d40_match[] = { + { .compatible = "stericsson,dma40", }, + {} +}; + +static struct platform_driver d40_driver = { + .driver = { + .name = D40_NAME, + .pm = &dma40_pm_ops, + .of_match_table = d40_match, + }, +}; + +static int __init stedma40_init(void) +{ + return platform_driver_probe(&d40_driver, d40_probe); +} +subsys_initcall(stedma40_init); diff --git a/drivers/dma/ste_dma40_ll.c b/drivers/dma/ste_dma40_ll.c new file mode 100644 index 000000000..27b818dee --- /dev/null +++ b/drivers/dma/ste_dma40_ll.c @@ -0,0 +1,448 @@ +/* + * Copyright (C) ST-Ericsson SA 2007-2010 + * Author: Per Forlin <per.forlin@stericsson.com> for ST-Ericsson + * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson + * License terms: GNU General Public License (GPL) version 2 + */ + +#include <linux/kernel.h> +#include <linux/platform_data/dma-ste-dma40.h> + +#include "ste_dma40_ll.h" + +u8 d40_width_to_bits(enum dma_slave_buswidth width) +{ + if (width == DMA_SLAVE_BUSWIDTH_1_BYTE) + return STEDMA40_ESIZE_8_BIT; + else if (width == DMA_SLAVE_BUSWIDTH_2_BYTES) + return STEDMA40_ESIZE_16_BIT; + else if (width == DMA_SLAVE_BUSWIDTH_8_BYTES) + return STEDMA40_ESIZE_64_BIT; + else + return STEDMA40_ESIZE_32_BIT; +} + +/* Sets up proper LCSP1 and LCSP3 register for a logical channel */ +void d40_log_cfg(struct stedma40_chan_cfg *cfg, + u32 *lcsp1, u32 *lcsp3) +{ + u32 l3 = 0; /* dst */ + u32 l1 = 0; /* src */ + + /* src is mem? -> increase address pos */ + if (cfg->dir == DMA_MEM_TO_DEV || + cfg->dir == DMA_MEM_TO_MEM) + l1 |= BIT(D40_MEM_LCSP1_SCFG_INCR_POS); + + /* dst is mem? -> increase address pos */ + if (cfg->dir == DMA_DEV_TO_MEM || + cfg->dir == DMA_MEM_TO_MEM) + l3 |= BIT(D40_MEM_LCSP3_DCFG_INCR_POS); + + /* src is hw? -> master port 1 */ + if (cfg->dir == DMA_DEV_TO_MEM || + cfg->dir == DMA_DEV_TO_DEV) + l1 |= BIT(D40_MEM_LCSP1_SCFG_MST_POS); + + /* dst is hw? -> master port 1 */ + if (cfg->dir == DMA_MEM_TO_DEV || + cfg->dir == DMA_DEV_TO_DEV) + l3 |= BIT(D40_MEM_LCSP3_DCFG_MST_POS); + + l3 |= BIT(D40_MEM_LCSP3_DCFG_EIM_POS); + l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS; + l3 |= d40_width_to_bits(cfg->dst_info.data_width) + << D40_MEM_LCSP3_DCFG_ESIZE_POS; + + l1 |= BIT(D40_MEM_LCSP1_SCFG_EIM_POS); + l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS; + l1 |= d40_width_to_bits(cfg->src_info.data_width) + << D40_MEM_LCSP1_SCFG_ESIZE_POS; + + *lcsp1 = l1; + *lcsp3 = l3; + +} + +void d40_phy_cfg(struct stedma40_chan_cfg *cfg, u32 *src_cfg, u32 *dst_cfg) +{ + u32 src = 0; + u32 dst = 0; + + if ((cfg->dir == DMA_DEV_TO_MEM) || + (cfg->dir == DMA_DEV_TO_DEV)) { + /* Set master port to 1 */ + src |= BIT(D40_SREG_CFG_MST_POS); + src |= D40_TYPE_TO_EVENT(cfg->dev_type); + + if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL) + src |= BIT(D40_SREG_CFG_PHY_TM_POS); + else + src |= 3 << D40_SREG_CFG_PHY_TM_POS; + } + if ((cfg->dir == DMA_MEM_TO_DEV) || + (cfg->dir == DMA_DEV_TO_DEV)) { + /* Set master port to 1 */ + dst |= BIT(D40_SREG_CFG_MST_POS); + dst |= D40_TYPE_TO_EVENT(cfg->dev_type); + + if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL) + dst |= BIT(D40_SREG_CFG_PHY_TM_POS); + else + dst |= 3 << D40_SREG_CFG_PHY_TM_POS; + } + /* Interrupt on end of transfer for destination */ + dst |= BIT(D40_SREG_CFG_TIM_POS); + + /* Generate interrupt on error */ + src |= BIT(D40_SREG_CFG_EIM_POS); + dst |= BIT(D40_SREG_CFG_EIM_POS); + + /* PSIZE */ + if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) { + src |= BIT(D40_SREG_CFG_PHY_PEN_POS); + src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS; + } + if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) { + dst |= BIT(D40_SREG_CFG_PHY_PEN_POS); + dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS; + } + + /* Element size */ + src |= d40_width_to_bits(cfg->src_info.data_width) + << D40_SREG_CFG_ESIZE_POS; + dst |= d40_width_to_bits(cfg->dst_info.data_width) + << D40_SREG_CFG_ESIZE_POS; + + /* Set the priority bit to high for the physical channel */ + if (cfg->high_priority) { + src |= BIT(D40_SREG_CFG_PRI_POS); + dst |= BIT(D40_SREG_CFG_PRI_POS); + } + + if (cfg->src_info.big_endian) + src |= BIT(D40_SREG_CFG_LBE_POS); + if (cfg->dst_info.big_endian) + dst |= BIT(D40_SREG_CFG_LBE_POS); + + *src_cfg = src; + *dst_cfg = dst; +} + +static int d40_phy_fill_lli(struct d40_phy_lli *lli, + dma_addr_t data, + u32 data_size, + dma_addr_t next_lli, + u32 reg_cfg, + struct stedma40_half_channel_info *info, + unsigned int flags) +{ + bool addr_inc = flags & LLI_ADDR_INC; + bool term_int = flags & LLI_TERM_INT; + unsigned int data_width = info->data_width; + int psize = info->psize; + int num_elems; + + if (psize == STEDMA40_PSIZE_PHY_1) + num_elems = 1; + else + num_elems = 2 << psize; + + /* Must be aligned */ + if (!IS_ALIGNED(data, data_width)) + return -EINVAL; + + /* Transfer size can't be smaller than (num_elms * elem_size) */ + if (data_size < num_elems * data_width) + return -EINVAL; + + /* The number of elements. IE now many chunks */ + lli->reg_elt = (data_size / data_width) << D40_SREG_ELEM_PHY_ECNT_POS; + + /* + * Distance to next element sized entry. + * Usually the size of the element unless you want gaps. + */ + if (addr_inc) + lli->reg_elt |= data_width << D40_SREG_ELEM_PHY_EIDX_POS; + + /* Where the data is */ + lli->reg_ptr = data; + lli->reg_cfg = reg_cfg; + + /* If this scatter list entry is the last one, no next link */ + if (next_lli == 0) + lli->reg_lnk = BIT(D40_SREG_LNK_PHY_TCP_POS); + else + lli->reg_lnk = next_lli; + + /* Set/clear interrupt generation on this link item.*/ + if (term_int) + lli->reg_cfg |= BIT(D40_SREG_CFG_TIM_POS); + else + lli->reg_cfg &= ~BIT(D40_SREG_CFG_TIM_POS); + + /* + * Post link - D40_SREG_LNK_PHY_PRE_POS = 0 + * Relink happens after transfer completion. + */ + + return 0; +} + +static int d40_seg_size(int size, int data_width1, int data_width2) +{ + u32 max_w = max(data_width1, data_width2); + u32 min_w = min(data_width1, data_width2); + u32 seg_max = ALIGN(STEDMA40_MAX_SEG_SIZE * min_w, max_w); + + if (seg_max > STEDMA40_MAX_SEG_SIZE) + seg_max -= max_w; + + if (size <= seg_max) + return size; + + if (size <= 2 * seg_max) + return ALIGN(size / 2, max_w); + + return seg_max; +} + +static struct d40_phy_lli * +d40_phy_buf_to_lli(struct d40_phy_lli *lli, dma_addr_t addr, u32 size, + dma_addr_t lli_phys, dma_addr_t first_phys, u32 reg_cfg, + struct stedma40_half_channel_info *info, + struct stedma40_half_channel_info *otherinfo, + unsigned long flags) +{ + bool lastlink = flags & LLI_LAST_LINK; + bool addr_inc = flags & LLI_ADDR_INC; + bool term_int = flags & LLI_TERM_INT; + bool cyclic = flags & LLI_CYCLIC; + int err; + dma_addr_t next = lli_phys; + int size_rest = size; + int size_seg = 0; + + /* + * This piece may be split up based on d40_seg_size(); we only want the + * term int on the last part. + */ + if (term_int) + flags &= ~LLI_TERM_INT; + + do { + size_seg = d40_seg_size(size_rest, info->data_width, + otherinfo->data_width); + size_rest -= size_seg; + + if (size_rest == 0 && term_int) + flags |= LLI_TERM_INT; + + if (size_rest == 0 && lastlink) + next = cyclic ? first_phys : 0; + else + next = ALIGN(next + sizeof(struct d40_phy_lli), + D40_LLI_ALIGN); + + err = d40_phy_fill_lli(lli, addr, size_seg, next, + reg_cfg, info, flags); + + if (err) + goto err; + + lli++; + if (addr_inc) + addr += size_seg; + } while (size_rest); + + return lli; + +err: + return NULL; +} + +int d40_phy_sg_to_lli(struct scatterlist *sg, + int sg_len, + dma_addr_t target, + struct d40_phy_lli *lli_sg, + dma_addr_t lli_phys, + u32 reg_cfg, + struct stedma40_half_channel_info *info, + struct stedma40_half_channel_info *otherinfo, + unsigned long flags) +{ + int total_size = 0; + int i; + struct scatterlist *current_sg = sg; + struct d40_phy_lli *lli = lli_sg; + dma_addr_t l_phys = lli_phys; + + if (!target) + flags |= LLI_ADDR_INC; + + for_each_sg(sg, current_sg, sg_len, i) { + dma_addr_t sg_addr = sg_dma_address(current_sg); + unsigned int len = sg_dma_len(current_sg); + dma_addr_t dst = target ?: sg_addr; + + total_size += sg_dma_len(current_sg); + + if (i == sg_len - 1) + flags |= LLI_TERM_INT | LLI_LAST_LINK; + + l_phys = ALIGN(lli_phys + (lli - lli_sg) * + sizeof(struct d40_phy_lli), D40_LLI_ALIGN); + + lli = d40_phy_buf_to_lli(lli, dst, len, l_phys, lli_phys, + reg_cfg, info, otherinfo, flags); + + if (lli == NULL) + return -EINVAL; + } + + return total_size; +} + + +/* DMA logical lli operations */ + +static void d40_log_lli_link(struct d40_log_lli *lli_dst, + struct d40_log_lli *lli_src, + int next, unsigned int flags) +{ + bool interrupt = flags & LLI_TERM_INT; + u32 slos = 0; + u32 dlos = 0; + + if (next != -EINVAL) { + slos = next * 2; + dlos = next * 2 + 1; + } + + if (interrupt) { + lli_dst->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK; + lli_dst->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK; + } + + lli_src->lcsp13 = (lli_src->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) | + (slos << D40_MEM_LCSP1_SLOS_POS); + + lli_dst->lcsp13 = (lli_dst->lcsp13 & ~D40_MEM_LCSP1_SLOS_MASK) | + (dlos << D40_MEM_LCSP1_SLOS_POS); +} + +void d40_log_lli_lcpa_write(struct d40_log_lli_full *lcpa, + struct d40_log_lli *lli_dst, + struct d40_log_lli *lli_src, + int next, unsigned int flags) +{ + d40_log_lli_link(lli_dst, lli_src, next, flags); + + writel_relaxed(lli_src->lcsp02, &lcpa[0].lcsp0); + writel_relaxed(lli_src->lcsp13, &lcpa[0].lcsp1); + writel_relaxed(lli_dst->lcsp02, &lcpa[0].lcsp2); + writel_relaxed(lli_dst->lcsp13, &lcpa[0].lcsp3); +} + +void d40_log_lli_lcla_write(struct d40_log_lli *lcla, + struct d40_log_lli *lli_dst, + struct d40_log_lli *lli_src, + int next, unsigned int flags) +{ + d40_log_lli_link(lli_dst, lli_src, next, flags); + + writel_relaxed(lli_src->lcsp02, &lcla[0].lcsp02); + writel_relaxed(lli_src->lcsp13, &lcla[0].lcsp13); + writel_relaxed(lli_dst->lcsp02, &lcla[1].lcsp02); + writel_relaxed(lli_dst->lcsp13, &lcla[1].lcsp13); +} + +static void d40_log_fill_lli(struct d40_log_lli *lli, + dma_addr_t data, u32 data_size, + u32 reg_cfg, + u32 data_width, + unsigned int flags) +{ + bool addr_inc = flags & LLI_ADDR_INC; + + lli->lcsp13 = reg_cfg; + + /* The number of elements to transfer */ + lli->lcsp02 = ((data_size / data_width) << + D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK; + + BUG_ON((data_size / data_width) > STEDMA40_MAX_SEG_SIZE); + + /* 16 LSBs address of the current element */ + lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK; + /* 16 MSBs address of the current element */ + lli->lcsp13 |= data & D40_MEM_LCSP1_SPTR_MASK; + + if (addr_inc) + lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK; + +} + +static struct d40_log_lli *d40_log_buf_to_lli(struct d40_log_lli *lli_sg, + dma_addr_t addr, + int size, + u32 lcsp13, /* src or dst*/ + u32 data_width1, + u32 data_width2, + unsigned int flags) +{ + bool addr_inc = flags & LLI_ADDR_INC; + struct d40_log_lli *lli = lli_sg; + int size_rest = size; + int size_seg = 0; + + do { + size_seg = d40_seg_size(size_rest, data_width1, data_width2); + size_rest -= size_seg; + + d40_log_fill_lli(lli, + addr, + size_seg, + lcsp13, data_width1, + flags); + if (addr_inc) + addr += size_seg; + lli++; + } while (size_rest); + + return lli; +} + +int d40_log_sg_to_lli(struct scatterlist *sg, + int sg_len, + dma_addr_t dev_addr, + struct d40_log_lli *lli_sg, + u32 lcsp13, /* src or dst*/ + u32 data_width1, u32 data_width2) +{ + int total_size = 0; + struct scatterlist *current_sg = sg; + int i; + struct d40_log_lli *lli = lli_sg; + unsigned long flags = 0; + + if (!dev_addr) + flags |= LLI_ADDR_INC; + + for_each_sg(sg, current_sg, sg_len, i) { + dma_addr_t sg_addr = sg_dma_address(current_sg); + unsigned int len = sg_dma_len(current_sg); + dma_addr_t addr = dev_addr ?: sg_addr; + + total_size += sg_dma_len(current_sg); + + lli = d40_log_buf_to_lli(lli, addr, len, + lcsp13, + data_width1, + data_width2, + flags); + } + + return total_size; +} diff --git a/drivers/dma/ste_dma40_ll.h b/drivers/dma/ste_dma40_ll.h new file mode 100644 index 000000000..1b47312bc --- /dev/null +++ b/drivers/dma/ste_dma40_ll.h @@ -0,0 +1,470 @@ +/* + * Copyright (C) ST-Ericsson SA 2007-2010 + * Author: Per Friden <per.friden@stericsson.com> for ST-Ericsson SA + * Author: Jonas Aaberg <jonas.aberg@stericsson.com> for ST-Ericsson SA + * License terms: GNU General Public License (GPL) version 2 + */ +#ifndef STE_DMA40_LL_H +#define STE_DMA40_LL_H + +#define D40_DREG_PCBASE 0x400 +#define D40_DREG_PCDELTA (8 * 4) +#define D40_LLI_ALIGN 16 /* LLI alignment must be 16 bytes. */ + +#define D40_LCPA_CHAN_SIZE 32 +#define D40_LCPA_CHAN_DST_DELTA 16 + +#define D40_TYPE_TO_GROUP(type) (type / 16) +#define D40_TYPE_TO_EVENT(type) (type % 16) +#define D40_GROUP_SIZE 8 +#define D40_PHYS_TO_GROUP(phys) ((phys & (D40_GROUP_SIZE - 1)) / 2) + +/* Most bits of the CFG register are the same in log as in phy mode */ +#define D40_SREG_CFG_MST_POS 15 +#define D40_SREG_CFG_TIM_POS 14 +#define D40_SREG_CFG_EIM_POS 13 +#define D40_SREG_CFG_LOG_INCR_POS 12 +#define D40_SREG_CFG_PHY_PEN_POS 12 +#define D40_SREG_CFG_PSIZE_POS 10 +#define D40_SREG_CFG_ESIZE_POS 8 +#define D40_SREG_CFG_PRI_POS 7 +#define D40_SREG_CFG_LBE_POS 6 +#define D40_SREG_CFG_LOG_GIM_POS 5 +#define D40_SREG_CFG_LOG_MFU_POS 4 +#define D40_SREG_CFG_PHY_TM_POS 4 +#define D40_SREG_CFG_PHY_EVTL_POS 0 + + +/* Standard channel parameters - basic mode (element register) */ +#define D40_SREG_ELEM_PHY_ECNT_POS 16 +#define D40_SREG_ELEM_PHY_EIDX_POS 0 + +#define D40_SREG_ELEM_PHY_ECNT_MASK (0xFFFF << D40_SREG_ELEM_PHY_ECNT_POS) + +/* Standard channel parameters - basic mode (Link register) */ +#define D40_SREG_LNK_PHY_TCP_POS 0 +#define D40_SREG_LNK_PHY_LMP_POS 1 +#define D40_SREG_LNK_PHY_PRE_POS 2 +/* + * Source destination link address. Contains the + * 29-bit byte word aligned address of the reload area. + */ +#define D40_SREG_LNK_PHYS_LNK_MASK 0xFFFFFFF8UL + +/* Standard basic channel logical mode */ + +/* Element register */ +#define D40_SREG_ELEM_LOG_ECNT_POS 16 +#define D40_SREG_ELEM_LOG_LIDX_POS 8 +#define D40_SREG_ELEM_LOG_LOS_POS 1 +#define D40_SREG_ELEM_LOG_TCP_POS 0 + +#define D40_SREG_ELEM_LOG_LIDX_MASK (0xFF << D40_SREG_ELEM_LOG_LIDX_POS) + +/* Link register */ +#define D40_EVENTLINE_POS(i) (2 * i) +#define D40_EVENTLINE_MASK(i) (0x3 << D40_EVENTLINE_POS(i)) + +/* Standard basic channel logical params in memory */ + +/* LCSP0 */ +#define D40_MEM_LCSP0_ECNT_POS 16 +#define D40_MEM_LCSP0_SPTR_POS 0 + +#define D40_MEM_LCSP0_ECNT_MASK (0xFFFF << D40_MEM_LCSP0_ECNT_POS) +#define D40_MEM_LCSP0_SPTR_MASK (0xFFFF << D40_MEM_LCSP0_SPTR_POS) + +/* LCSP1 */ +#define D40_MEM_LCSP1_SPTR_POS 16 +#define D40_MEM_LCSP1_SCFG_MST_POS 15 +#define D40_MEM_LCSP1_SCFG_TIM_POS 14 +#define D40_MEM_LCSP1_SCFG_EIM_POS 13 +#define D40_MEM_LCSP1_SCFG_INCR_POS 12 +#define D40_MEM_LCSP1_SCFG_PSIZE_POS 10 +#define D40_MEM_LCSP1_SCFG_ESIZE_POS 8 +#define D40_MEM_LCSP1_SLOS_POS 1 +#define D40_MEM_LCSP1_STCP_POS 0 + +#define D40_MEM_LCSP1_SPTR_MASK (0xFFFF << D40_MEM_LCSP1_SPTR_POS) +#define D40_MEM_LCSP1_SCFG_TIM_MASK (0x1 << D40_MEM_LCSP1_SCFG_TIM_POS) +#define D40_MEM_LCSP1_SCFG_INCR_MASK (0x1 << D40_MEM_LCSP1_SCFG_INCR_POS) +#define D40_MEM_LCSP1_SCFG_PSIZE_MASK (0x3 << D40_MEM_LCSP1_SCFG_PSIZE_POS) +#define D40_MEM_LCSP1_SLOS_MASK (0x7F << D40_MEM_LCSP1_SLOS_POS) +#define D40_MEM_LCSP1_STCP_MASK (0x1 << D40_MEM_LCSP1_STCP_POS) + +/* LCSP2 */ +#define D40_MEM_LCSP2_ECNT_POS 16 + +#define D40_MEM_LCSP2_ECNT_MASK (0xFFFF << D40_MEM_LCSP2_ECNT_POS) + +/* LCSP3 */ +#define D40_MEM_LCSP3_DCFG_MST_POS 15 +#define D40_MEM_LCSP3_DCFG_TIM_POS 14 +#define D40_MEM_LCSP3_DCFG_EIM_POS 13 +#define D40_MEM_LCSP3_DCFG_INCR_POS 12 +#define D40_MEM_LCSP3_DCFG_PSIZE_POS 10 +#define D40_MEM_LCSP3_DCFG_ESIZE_POS 8 +#define D40_MEM_LCSP3_DLOS_POS 1 +#define D40_MEM_LCSP3_DTCP_POS 0 + +#define D40_MEM_LCSP3_DLOS_MASK (0x7F << D40_MEM_LCSP3_DLOS_POS) +#define D40_MEM_LCSP3_DTCP_MASK (0x1 << D40_MEM_LCSP3_DTCP_POS) + + +/* Standard channel parameter register offsets */ +#define D40_CHAN_REG_SSCFG 0x00 +#define D40_CHAN_REG_SSELT 0x04 +#define D40_CHAN_REG_SSPTR 0x08 +#define D40_CHAN_REG_SSLNK 0x0C +#define D40_CHAN_REG_SDCFG 0x10 +#define D40_CHAN_REG_SDELT 0x14 +#define D40_CHAN_REG_SDPTR 0x18 +#define D40_CHAN_REG_SDLNK 0x1C + +/* DMA Register Offsets */ +#define D40_DREG_GCC 0x000 +#define D40_DREG_GCC_ENA 0x1 +/* This assumes that there are only 4 event groups */ +#define D40_DREG_GCC_ENABLE_ALL 0x3ff01 +#define D40_DREG_GCC_EVTGRP_POS 8 +#define D40_DREG_GCC_SRC 0 +#define D40_DREG_GCC_DST 1 +#define D40_DREG_GCC_EVTGRP_ENA(x, y) \ + (1 << (D40_DREG_GCC_EVTGRP_POS + 2 * x + y)) + +#define D40_DREG_PRTYP 0x004 +#define D40_DREG_PRSME 0x008 +#define D40_DREG_PRSMO 0x00C +#define D40_DREG_PRMSE 0x010 +#define D40_DREG_PRMSO 0x014 +#define D40_DREG_PRMOE 0x018 +#define D40_DREG_PRMOO 0x01C +#define D40_DREG_PRMO_PCHAN_BASIC 0x1 +#define D40_DREG_PRMO_PCHAN_MODULO 0x2 +#define D40_DREG_PRMO_PCHAN_DOUBLE_DST 0x3 +#define D40_DREG_PRMO_LCHAN_SRC_PHY_DST_LOG 0x1 +#define D40_DREG_PRMO_LCHAN_SRC_LOG_DST_PHY 0x2 +#define D40_DREG_PRMO_LCHAN_SRC_LOG_DST_LOG 0x3 + +#define D40_DREG_LCPA 0x020 +#define D40_DREG_LCLA 0x024 + +#define D40_DREG_SSEG1 0x030 +#define D40_DREG_SSEG2 0x034 +#define D40_DREG_SSEG3 0x038 +#define D40_DREG_SSEG4 0x03C + +#define D40_DREG_SCEG1 0x040 +#define D40_DREG_SCEG2 0x044 +#define D40_DREG_SCEG3 0x048 +#define D40_DREG_SCEG4 0x04C + +#define D40_DREG_ACTIVE 0x050 +#define D40_DREG_ACTIVO 0x054 +#define D40_DREG_CIDMOD 0x058 +#define D40_DREG_TCIDV 0x05C +#define D40_DREG_PCMIS 0x060 +#define D40_DREG_PCICR 0x064 +#define D40_DREG_PCTIS 0x068 +#define D40_DREG_PCEIS 0x06C + +#define D40_DREG_SPCMIS 0x070 +#define D40_DREG_SPCICR 0x074 +#define D40_DREG_SPCTIS 0x078 +#define D40_DREG_SPCEIS 0x07C + +#define D40_DREG_LCMIS0 0x080 +#define D40_DREG_LCMIS1 0x084 +#define D40_DREG_LCMIS2 0x088 +#define D40_DREG_LCMIS3 0x08C +#define D40_DREG_LCICR0 0x090 +#define D40_DREG_LCICR1 0x094 +#define D40_DREG_LCICR2 0x098 +#define D40_DREG_LCICR3 0x09C +#define D40_DREG_LCTIS0 0x0A0 +#define D40_DREG_LCTIS1 0x0A4 +#define D40_DREG_LCTIS2 0x0A8 +#define D40_DREG_LCTIS3 0x0AC +#define D40_DREG_LCEIS0 0x0B0 +#define D40_DREG_LCEIS1 0x0B4 +#define D40_DREG_LCEIS2 0x0B8 +#define D40_DREG_LCEIS3 0x0BC + +#define D40_DREG_SLCMIS1 0x0C0 +#define D40_DREG_SLCMIS2 0x0C4 +#define D40_DREG_SLCMIS3 0x0C8 +#define D40_DREG_SLCMIS4 0x0CC + +#define D40_DREG_SLCICR1 0x0D0 +#define D40_DREG_SLCICR2 0x0D4 +#define D40_DREG_SLCICR3 0x0D8 +#define D40_DREG_SLCICR4 0x0DC + +#define D40_DREG_SLCTIS1 0x0E0 +#define D40_DREG_SLCTIS2 0x0E4 +#define D40_DREG_SLCTIS3 0x0E8 +#define D40_DREG_SLCTIS4 0x0EC + +#define D40_DREG_SLCEIS1 0x0F0 +#define D40_DREG_SLCEIS2 0x0F4 +#define D40_DREG_SLCEIS3 0x0F8 +#define D40_DREG_SLCEIS4 0x0FC + +#define D40_DREG_FSESS1 0x100 +#define D40_DREG_FSESS2 0x104 + +#define D40_DREG_FSEBS1 0x108 +#define D40_DREG_FSEBS2 0x10C + +#define D40_DREG_PSEG1 0x110 +#define D40_DREG_PSEG2 0x114 +#define D40_DREG_PSEG3 0x118 +#define D40_DREG_PSEG4 0x11C +#define D40_DREG_PCEG1 0x120 +#define D40_DREG_PCEG2 0x124 +#define D40_DREG_PCEG3 0x128 +#define D40_DREG_PCEG4 0x12C +#define D40_DREG_RSEG1 0x130 +#define D40_DREG_RSEG2 0x134 +#define D40_DREG_RSEG3 0x138 +#define D40_DREG_RSEG4 0x13C +#define D40_DREG_RCEG1 0x140 +#define D40_DREG_RCEG2 0x144 +#define D40_DREG_RCEG3 0x148 +#define D40_DREG_RCEG4 0x14C + +#define D40_DREG_PREFOT 0x15C +#define D40_DREG_EXTCFG 0x160 + +#define D40_DREG_CPSEG1 0x200 +#define D40_DREG_CPSEG2 0x204 +#define D40_DREG_CPSEG3 0x208 +#define D40_DREG_CPSEG4 0x20C +#define D40_DREG_CPSEG5 0x210 + +#define D40_DREG_CPCEG1 0x220 +#define D40_DREG_CPCEG2 0x224 +#define D40_DREG_CPCEG3 0x228 +#define D40_DREG_CPCEG4 0x22C +#define D40_DREG_CPCEG5 0x230 + +#define D40_DREG_CRSEG1 0x240 +#define D40_DREG_CRSEG2 0x244 +#define D40_DREG_CRSEG3 0x248 +#define D40_DREG_CRSEG4 0x24C +#define D40_DREG_CRSEG5 0x250 + +#define D40_DREG_CRCEG1 0x260 +#define D40_DREG_CRCEG2 0x264 +#define D40_DREG_CRCEG3 0x268 +#define D40_DREG_CRCEG4 0x26C +#define D40_DREG_CRCEG5 0x270 + +#define D40_DREG_CFSESS1 0x280 +#define D40_DREG_CFSESS2 0x284 +#define D40_DREG_CFSESS3 0x288 + +#define D40_DREG_CFSEBS1 0x290 +#define D40_DREG_CFSEBS2 0x294 +#define D40_DREG_CFSEBS3 0x298 + +#define D40_DREG_CLCMIS1 0x300 +#define D40_DREG_CLCMIS2 0x304 +#define D40_DREG_CLCMIS3 0x308 +#define D40_DREG_CLCMIS4 0x30C +#define D40_DREG_CLCMIS5 0x310 + +#define D40_DREG_CLCICR1 0x320 +#define D40_DREG_CLCICR2 0x324 +#define D40_DREG_CLCICR3 0x328 +#define D40_DREG_CLCICR4 0x32C +#define D40_DREG_CLCICR5 0x330 + +#define D40_DREG_CLCTIS1 0x340 +#define D40_DREG_CLCTIS2 0x344 +#define D40_DREG_CLCTIS3 0x348 +#define D40_DREG_CLCTIS4 0x34C +#define D40_DREG_CLCTIS5 0x350 + +#define D40_DREG_CLCEIS1 0x360 +#define D40_DREG_CLCEIS2 0x364 +#define D40_DREG_CLCEIS3 0x368 +#define D40_DREG_CLCEIS4 0x36C +#define D40_DREG_CLCEIS5 0x370 + +#define D40_DREG_CPCMIS 0x380 +#define D40_DREG_CPCICR 0x384 +#define D40_DREG_CPCTIS 0x388 +#define D40_DREG_CPCEIS 0x38C + +#define D40_DREG_SCCIDA1 0xE80 +#define D40_DREG_SCCIDA2 0xE90 +#define D40_DREG_SCCIDA3 0xEA0 +#define D40_DREG_SCCIDA4 0xEB0 +#define D40_DREG_SCCIDA5 0xEC0 + +#define D40_DREG_SCCIDB1 0xE84 +#define D40_DREG_SCCIDB2 0xE94 +#define D40_DREG_SCCIDB3 0xEA4 +#define D40_DREG_SCCIDB4 0xEB4 +#define D40_DREG_SCCIDB5 0xEC4 + +#define D40_DREG_PRSCCIDA 0xF80 +#define D40_DREG_PRSCCIDB 0xF84 + +#define D40_DREG_STFU 0xFC8 +#define D40_DREG_ICFG 0xFCC +#define D40_DREG_PERIPHID0 0xFE0 +#define D40_DREG_PERIPHID1 0xFE4 +#define D40_DREG_PERIPHID2 0xFE8 +#define D40_DREG_PERIPHID3 0xFEC +#define D40_DREG_CELLID0 0xFF0 +#define D40_DREG_CELLID1 0xFF4 +#define D40_DREG_CELLID2 0xFF8 +#define D40_DREG_CELLID3 0xFFC + +/* LLI related structures */ + +/** + * struct d40_phy_lli - The basic configuration register for each physical + * channel. + * + * @reg_cfg: The configuration register. + * @reg_elt: The element register. + * @reg_ptr: The pointer register. + * @reg_lnk: The link register. + * + * These registers are set up for both physical and logical transfers + * Note that the bit in each register means differently in logical and + * physical(standard) mode. + * + * This struct must be 16 bytes aligned, and only contain physical registers + * since it will be directly accessed by the DMA. + */ +struct d40_phy_lli { + u32 reg_cfg; + u32 reg_elt; + u32 reg_ptr; + u32 reg_lnk; +}; + +/** + * struct d40_phy_lli_bidir - struct for a transfer. + * + * @src: Register settings for src channel. + * @dst: Register settings for dst channel. + * + * All DMA transfers have a source and a destination. + */ + +struct d40_phy_lli_bidir { + struct d40_phy_lli *src; + struct d40_phy_lli *dst; +}; + + +/** + * struct d40_log_lli - logical lli configuration + * + * @lcsp02: Either maps to register lcsp0 if src or lcsp2 if dst. + * @lcsp13: Either maps to register lcsp1 if src or lcsp3 if dst. + * + * This struct must be 8 bytes aligned since it will be accessed directy by + * the DMA. Never add any none hw mapped registers to this struct. + */ + +struct d40_log_lli { + u32 lcsp02; + u32 lcsp13; +}; + +/** + * struct d40_log_lli_bidir - For both src and dst + * + * @src: pointer to src lli configuration. + * @dst: pointer to dst lli configuration. + * + * You always have a src and a dst when doing DMA transfers. + */ + +struct d40_log_lli_bidir { + struct d40_log_lli *src; + struct d40_log_lli *dst; +}; + +/** + * struct d40_log_lli_full - LCPA layout + * + * @lcsp0: Logical Channel Standard Param 0 - Src. + * @lcsp1: Logical Channel Standard Param 1 - Src. + * @lcsp2: Logical Channel Standard Param 2 - Dst. + * @lcsp3: Logical Channel Standard Param 3 - Dst. + * + * This struct maps to LCPA physical memory layout. Must map to + * the hw. + */ +struct d40_log_lli_full { + u32 lcsp0; + u32 lcsp1; + u32 lcsp2; + u32 lcsp3; +}; + +/** + * struct d40_def_lcsp - Default LCSP1 and LCSP3 settings + * + * @lcsp3: The default configuration for dst. + * @lcsp1: The default configuration for src. + */ +struct d40_def_lcsp { + u32 lcsp3; + u32 lcsp1; +}; + +/* Physical channels */ + +enum d40_lli_flags { + LLI_ADDR_INC = 1 << 0, + LLI_TERM_INT = 1 << 1, + LLI_CYCLIC = 1 << 2, + LLI_LAST_LINK = 1 << 3, +}; + +void d40_phy_cfg(struct stedma40_chan_cfg *cfg, + u32 *src_cfg, + u32 *dst_cfg); + +void d40_log_cfg(struct stedma40_chan_cfg *cfg, + u32 *lcsp1, + u32 *lcsp2); + +int d40_phy_sg_to_lli(struct scatterlist *sg, + int sg_len, + dma_addr_t target, + struct d40_phy_lli *lli, + dma_addr_t lli_phys, + u32 reg_cfg, + struct stedma40_half_channel_info *info, + struct stedma40_half_channel_info *otherinfo, + unsigned long flags); + +/* Logical channels */ + +int d40_log_sg_to_lli(struct scatterlist *sg, + int sg_len, + dma_addr_t dev_addr, + struct d40_log_lli *lli_sg, + u32 lcsp13, /* src or dst*/ + u32 data_width1, u32 data_width2); + +void d40_log_lli_lcpa_write(struct d40_log_lli_full *lcpa, + struct d40_log_lli *lli_dst, + struct d40_log_lli *lli_src, + int next, unsigned int flags); + +void d40_log_lli_lcla_write(struct d40_log_lli *lcla, + struct d40_log_lli *lli_dst, + struct d40_log_lli *lli_src, + int next, unsigned int flags); + +#endif /* STE_DMA40_LLI_H */ diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c new file mode 100644 index 000000000..11e536586 --- /dev/null +++ b/drivers/dma/sun6i-dma.c @@ -0,0 +1,1089 @@ +/* + * Copyright (C) 2013-2014 Allwinner Tech Co., Ltd + * Author: Sugar <shuge@allwinnertech.com> + * + * Copyright (C) 2014 Maxime Ripard + * Maxime Ripard <maxime.ripard@free-electrons.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/of_dma.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/reset.h> +#include <linux/slab.h> +#include <linux/types.h> + +#include "virt-dma.h" + +/* + * Common registers + */ +#define DMA_IRQ_EN(x) ((x) * 0x04) +#define DMA_IRQ_HALF BIT(0) +#define DMA_IRQ_PKG BIT(1) +#define DMA_IRQ_QUEUE BIT(2) + +#define DMA_IRQ_CHAN_NR 8 +#define DMA_IRQ_CHAN_WIDTH 4 + + +#define DMA_IRQ_STAT(x) ((x) * 0x04 + 0x10) + +#define DMA_STAT 0x30 + +/* + * sun8i specific registers + */ +#define SUN8I_DMA_GATE 0x20 +#define SUN8I_DMA_GATE_ENABLE 0x4 + +/* + * Channels specific registers + */ +#define DMA_CHAN_ENABLE 0x00 +#define DMA_CHAN_ENABLE_START BIT(0) +#define DMA_CHAN_ENABLE_STOP 0 + +#define DMA_CHAN_PAUSE 0x04 +#define DMA_CHAN_PAUSE_PAUSE BIT(1) +#define DMA_CHAN_PAUSE_RESUME 0 + +#define DMA_CHAN_LLI_ADDR 0x08 + +#define DMA_CHAN_CUR_CFG 0x0c +#define DMA_CHAN_CFG_SRC_DRQ(x) ((x) & 0x1f) +#define DMA_CHAN_CFG_SRC_IO_MODE BIT(5) +#define DMA_CHAN_CFG_SRC_LINEAR_MODE (0 << 5) +#define DMA_CHAN_CFG_SRC_BURST(x) (((x) & 0x3) << 7) +#define DMA_CHAN_CFG_SRC_WIDTH(x) (((x) & 0x3) << 9) + +#define DMA_CHAN_CFG_DST_DRQ(x) (DMA_CHAN_CFG_SRC_DRQ(x) << 16) +#define DMA_CHAN_CFG_DST_IO_MODE (DMA_CHAN_CFG_SRC_IO_MODE << 16) +#define DMA_CHAN_CFG_DST_LINEAR_MODE (DMA_CHAN_CFG_SRC_LINEAR_MODE << 16) +#define DMA_CHAN_CFG_DST_BURST(x) (DMA_CHAN_CFG_SRC_BURST(x) << 16) +#define DMA_CHAN_CFG_DST_WIDTH(x) (DMA_CHAN_CFG_SRC_WIDTH(x) << 16) + +#define DMA_CHAN_CUR_SRC 0x10 + +#define DMA_CHAN_CUR_DST 0x14 + +#define DMA_CHAN_CUR_CNT 0x18 + +#define DMA_CHAN_CUR_PARA 0x1c + + +/* + * Various hardware related defines + */ +#define LLI_LAST_ITEM 0xfffff800 +#define NORMAL_WAIT 8 +#define DRQ_SDRAM 1 + +/* + * Hardware channels / ports representation + * + * The hardware is used in several SoCs, with differing numbers + * of channels and endpoints. This structure ties those numbers + * to a certain compatible string. + */ +struct sun6i_dma_config { + u32 nr_max_channels; + u32 nr_max_requests; + u32 nr_max_vchans; +}; + +/* + * Hardware representation of the LLI + * + * The hardware will be fed the physical address of this structure, + * and read its content in order to start the transfer. + */ +struct sun6i_dma_lli { + u32 cfg; + u32 src; + u32 dst; + u32 len; + u32 para; + u32 p_lli_next; + + /* + * This field is not used by the DMA controller, but will be + * used by the CPU to go through the list (mostly for dumping + * or freeing it). + */ + struct sun6i_dma_lli *v_lli_next; +}; + + +struct sun6i_desc { + struct virt_dma_desc vd; + dma_addr_t p_lli; + struct sun6i_dma_lli *v_lli; +}; + +struct sun6i_pchan { + u32 idx; + void __iomem *base; + struct sun6i_vchan *vchan; + struct sun6i_desc *desc; + struct sun6i_desc *done; +}; + +struct sun6i_vchan { + struct virt_dma_chan vc; + struct list_head node; + struct dma_slave_config cfg; + struct sun6i_pchan *phy; + u8 port; +}; + +struct sun6i_dma_dev { + struct dma_device slave; + void __iomem *base; + struct clk *clk; + int irq; + spinlock_t lock; + struct reset_control *rstc; + struct tasklet_struct task; + atomic_t tasklet_shutdown; + struct list_head pending; + struct dma_pool *pool; + struct sun6i_pchan *pchans; + struct sun6i_vchan *vchans; + const struct sun6i_dma_config *cfg; +}; + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} + +static inline struct sun6i_dma_dev *to_sun6i_dma_dev(struct dma_device *d) +{ + return container_of(d, struct sun6i_dma_dev, slave); +} + +static inline struct sun6i_vchan *to_sun6i_vchan(struct dma_chan *chan) +{ + return container_of(chan, struct sun6i_vchan, vc.chan); +} + +static inline struct sun6i_desc * +to_sun6i_desc(struct dma_async_tx_descriptor *tx) +{ + return container_of(tx, struct sun6i_desc, vd.tx); +} + +static inline void sun6i_dma_dump_com_regs(struct sun6i_dma_dev *sdev) +{ + dev_dbg(sdev->slave.dev, "Common register:\n" + "\tmask0(%04x): 0x%08x\n" + "\tmask1(%04x): 0x%08x\n" + "\tpend0(%04x): 0x%08x\n" + "\tpend1(%04x): 0x%08x\n" + "\tstats(%04x): 0x%08x\n", + DMA_IRQ_EN(0), readl(sdev->base + DMA_IRQ_EN(0)), + DMA_IRQ_EN(1), readl(sdev->base + DMA_IRQ_EN(1)), + DMA_IRQ_STAT(0), readl(sdev->base + DMA_IRQ_STAT(0)), + DMA_IRQ_STAT(1), readl(sdev->base + DMA_IRQ_STAT(1)), + DMA_STAT, readl(sdev->base + DMA_STAT)); +} + +static inline void sun6i_dma_dump_chan_regs(struct sun6i_dma_dev *sdev, + struct sun6i_pchan *pchan) +{ + phys_addr_t reg = virt_to_phys(pchan->base); + + dev_dbg(sdev->slave.dev, "Chan %d reg: %pa\n" + "\t___en(%04x): \t0x%08x\n" + "\tpause(%04x): \t0x%08x\n" + "\tstart(%04x): \t0x%08x\n" + "\t__cfg(%04x): \t0x%08x\n" + "\t__src(%04x): \t0x%08x\n" + "\t__dst(%04x): \t0x%08x\n" + "\tcount(%04x): \t0x%08x\n" + "\t_para(%04x): \t0x%08x\n\n", + pchan->idx, ®, + DMA_CHAN_ENABLE, + readl(pchan->base + DMA_CHAN_ENABLE), + DMA_CHAN_PAUSE, + readl(pchan->base + DMA_CHAN_PAUSE), + DMA_CHAN_LLI_ADDR, + readl(pchan->base + DMA_CHAN_LLI_ADDR), + DMA_CHAN_CUR_CFG, + readl(pchan->base + DMA_CHAN_CUR_CFG), + DMA_CHAN_CUR_SRC, + readl(pchan->base + DMA_CHAN_CUR_SRC), + DMA_CHAN_CUR_DST, + readl(pchan->base + DMA_CHAN_CUR_DST), + DMA_CHAN_CUR_CNT, + readl(pchan->base + DMA_CHAN_CUR_CNT), + DMA_CHAN_CUR_PARA, + readl(pchan->base + DMA_CHAN_CUR_PARA)); +} + +static inline s8 convert_burst(u32 maxburst) +{ + switch (maxburst) { + case 1: + return 0; + case 8: + return 2; + default: + return -EINVAL; + } +} + +static inline s8 convert_buswidth(enum dma_slave_buswidth addr_width) +{ + if ((addr_width < DMA_SLAVE_BUSWIDTH_1_BYTE) || + (addr_width > DMA_SLAVE_BUSWIDTH_4_BYTES)) + return -EINVAL; + + return addr_width >> 1; +} + +static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev, + struct sun6i_dma_lli *next, + dma_addr_t next_phy, + struct sun6i_desc *txd) +{ + if ((!prev && !txd) || !next) + return NULL; + + if (!prev) { + txd->p_lli = next_phy; + txd->v_lli = next; + } else { + prev->p_lli_next = next_phy; + prev->v_lli_next = next; + } + + next->p_lli_next = LLI_LAST_ITEM; + next->v_lli_next = NULL; + + return next; +} + +static inline int sun6i_dma_cfg_lli(struct sun6i_dma_lli *lli, + dma_addr_t src, + dma_addr_t dst, u32 len, + struct dma_slave_config *config) +{ + u8 src_width, dst_width, src_burst, dst_burst; + + if (!config) + return -EINVAL; + + src_burst = convert_burst(config->src_maxburst); + if (src_burst) + return src_burst; + + dst_burst = convert_burst(config->dst_maxburst); + if (dst_burst) + return dst_burst; + + src_width = convert_buswidth(config->src_addr_width); + if (src_width) + return src_width; + + dst_width = convert_buswidth(config->dst_addr_width); + if (dst_width) + return dst_width; + + lli->cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) | + DMA_CHAN_CFG_SRC_WIDTH(src_width) | + DMA_CHAN_CFG_DST_BURST(dst_burst) | + DMA_CHAN_CFG_DST_WIDTH(dst_width); + + lli->src = src; + lli->dst = dst; + lli->len = len; + lli->para = NORMAL_WAIT; + + return 0; +} + +static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan, + struct sun6i_dma_lli *lli) +{ + phys_addr_t p_lli = virt_to_phys(lli); + + dev_dbg(chan2dev(&vchan->vc.chan), + "\n\tdesc: p - %pa v - 0x%p\n" + "\t\tc - 0x%08x s - 0x%08x d - 0x%08x\n" + "\t\tl - 0x%08x p - 0x%08x n - 0x%08x\n", + &p_lli, lli, + lli->cfg, lli->src, lli->dst, + lli->len, lli->para, lli->p_lli_next); +} + +static void sun6i_dma_free_desc(struct virt_dma_desc *vd) +{ + struct sun6i_desc *txd = to_sun6i_desc(&vd->tx); + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vd->tx.chan->device); + struct sun6i_dma_lli *v_lli, *v_next; + dma_addr_t p_lli, p_next; + + if (unlikely(!txd)) + return; + + p_lli = txd->p_lli; + v_lli = txd->v_lli; + + while (v_lli) { + v_next = v_lli->v_lli_next; + p_next = v_lli->p_lli_next; + + dma_pool_free(sdev->pool, v_lli, p_lli); + + v_lli = v_next; + p_lli = p_next; + } + + kfree(txd); +} + +static int sun6i_dma_start_desc(struct sun6i_vchan *vchan) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(vchan->vc.chan.device); + struct virt_dma_desc *desc = vchan_next_desc(&vchan->vc); + struct sun6i_pchan *pchan = vchan->phy; + u32 irq_val, irq_reg, irq_offset; + + if (!pchan) + return -EAGAIN; + + if (!desc) { + pchan->desc = NULL; + pchan->done = NULL; + return -EAGAIN; + } + + list_del(&desc->node); + + pchan->desc = to_sun6i_desc(&desc->tx); + pchan->done = NULL; + + sun6i_dma_dump_lli(vchan, pchan->desc->v_lli); + + irq_reg = pchan->idx / DMA_IRQ_CHAN_NR; + irq_offset = pchan->idx % DMA_IRQ_CHAN_NR; + + irq_val = readl(sdev->base + DMA_IRQ_EN(irq_offset)); + irq_val |= DMA_IRQ_QUEUE << (irq_offset * DMA_IRQ_CHAN_WIDTH); + writel(irq_val, sdev->base + DMA_IRQ_EN(irq_offset)); + + writel(pchan->desc->p_lli, pchan->base + DMA_CHAN_LLI_ADDR); + writel(DMA_CHAN_ENABLE_START, pchan->base + DMA_CHAN_ENABLE); + + sun6i_dma_dump_com_regs(sdev); + sun6i_dma_dump_chan_regs(sdev, pchan); + + return 0; +} + +static void sun6i_dma_tasklet(unsigned long data) +{ + struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data; + const struct sun6i_dma_config *cfg = sdev->cfg; + struct sun6i_vchan *vchan; + struct sun6i_pchan *pchan; + unsigned int pchan_alloc = 0; + unsigned int pchan_idx; + + list_for_each_entry(vchan, &sdev->slave.channels, vc.chan.device_node) { + spin_lock_irq(&vchan->vc.lock); + + pchan = vchan->phy; + + if (pchan && pchan->done) { + if (sun6i_dma_start_desc(vchan)) { + /* + * No current txd associated with this channel + */ + dev_dbg(sdev->slave.dev, "pchan %u: free\n", + pchan->idx); + + /* Mark this channel free */ + vchan->phy = NULL; + pchan->vchan = NULL; + } + } + spin_unlock_irq(&vchan->vc.lock); + } + + spin_lock_irq(&sdev->lock); + for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) { + pchan = &sdev->pchans[pchan_idx]; + + if (pchan->vchan || list_empty(&sdev->pending)) + continue; + + vchan = list_first_entry(&sdev->pending, + struct sun6i_vchan, node); + + /* Remove from pending channels */ + list_del_init(&vchan->node); + pchan_alloc |= BIT(pchan_idx); + + /* Mark this channel allocated */ + pchan->vchan = vchan; + vchan->phy = pchan; + dev_dbg(sdev->slave.dev, "pchan %u: alloc vchan %p\n", + pchan->idx, &vchan->vc); + } + spin_unlock_irq(&sdev->lock); + + for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) { + if (!(pchan_alloc & BIT(pchan_idx))) + continue; + + pchan = sdev->pchans + pchan_idx; + vchan = pchan->vchan; + if (vchan) { + spin_lock_irq(&vchan->vc.lock); + sun6i_dma_start_desc(vchan); + spin_unlock_irq(&vchan->vc.lock); + } + } +} + +static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id) +{ + struct sun6i_dma_dev *sdev = dev_id; + struct sun6i_vchan *vchan; + struct sun6i_pchan *pchan; + int i, j, ret = IRQ_NONE; + u32 status; + + for (i = 0; i < sdev->cfg->nr_max_channels / DMA_IRQ_CHAN_NR; i++) { + status = readl(sdev->base + DMA_IRQ_STAT(i)); + if (!status) + continue; + + dev_dbg(sdev->slave.dev, "DMA irq status %s: 0x%x\n", + i ? "high" : "low", status); + + writel(status, sdev->base + DMA_IRQ_STAT(i)); + + for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) { + if (status & DMA_IRQ_QUEUE) { + pchan = sdev->pchans + j; + vchan = pchan->vchan; + + if (vchan) { + spin_lock(&vchan->vc.lock); + vchan_cookie_complete(&pchan->desc->vd); + pchan->done = pchan->desc; + spin_unlock(&vchan->vc.lock); + } + } + + status = status >> DMA_IRQ_CHAN_WIDTH; + } + + if (!atomic_read(&sdev->tasklet_shutdown)) + tasklet_schedule(&sdev->task); + ret = IRQ_HANDLED; + } + + return ret; +} + +static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy( + struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + struct sun6i_dma_lli *v_lli; + struct sun6i_desc *txd; + dma_addr_t p_lli; + s8 burst, width; + + dev_dbg(chan2dev(chan), + "%s; chan: %d, dest: %pad, src: %pad, len: %zu. flags: 0x%08lx\n", + __func__, vchan->vc.chan.chan_id, &dest, &src, len, flags); + + if (!len) + return NULL; + + txd = kzalloc(sizeof(*txd), GFP_NOWAIT); + if (!txd) + return NULL; + + v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli); + if (!v_lli) { + dev_err(sdev->slave.dev, "Failed to alloc lli memory\n"); + goto err_txd_free; + } + + v_lli->src = src; + v_lli->dst = dest; + v_lli->len = len; + v_lli->para = NORMAL_WAIT; + + burst = convert_burst(8); + width = convert_buswidth(DMA_SLAVE_BUSWIDTH_4_BYTES); + v_lli->cfg |= DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) | + DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) | + DMA_CHAN_CFG_DST_LINEAR_MODE | + DMA_CHAN_CFG_SRC_LINEAR_MODE | + DMA_CHAN_CFG_SRC_BURST(burst) | + DMA_CHAN_CFG_SRC_WIDTH(width) | + DMA_CHAN_CFG_DST_BURST(burst) | + DMA_CHAN_CFG_DST_WIDTH(width); + + sun6i_dma_lli_add(NULL, v_lli, p_lli, txd); + + sun6i_dma_dump_lli(vchan, v_lli); + + return vchan_tx_prep(&vchan->vc, &txd->vd, flags); + +err_txd_free: + kfree(txd); + return NULL; +} + +static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction dir, + unsigned long flags, void *context) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + struct dma_slave_config *sconfig = &vchan->cfg; + struct sun6i_dma_lli *v_lli, *prev = NULL; + struct sun6i_desc *txd; + struct scatterlist *sg; + dma_addr_t p_lli; + int i, ret; + + if (!sgl) + return NULL; + + if (!is_slave_direction(dir)) { + dev_err(chan2dev(chan), "Invalid DMA direction\n"); + return NULL; + } + + txd = kzalloc(sizeof(*txd), GFP_NOWAIT); + if (!txd) + return NULL; + + for_each_sg(sgl, sg, sg_len, i) { + v_lli = dma_pool_alloc(sdev->pool, GFP_NOWAIT, &p_lli); + if (!v_lli) + goto err_lli_free; + + if (dir == DMA_MEM_TO_DEV) { + ret = sun6i_dma_cfg_lli(v_lli, sg_dma_address(sg), + sconfig->dst_addr, sg_dma_len(sg), + sconfig); + if (ret) + goto err_cur_lli_free; + + v_lli->cfg |= DMA_CHAN_CFG_DST_IO_MODE | + DMA_CHAN_CFG_SRC_LINEAR_MODE | + DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) | + DMA_CHAN_CFG_DST_DRQ(vchan->port); + + dev_dbg(chan2dev(chan), + "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n", + __func__, vchan->vc.chan.chan_id, + &sconfig->dst_addr, &sg_dma_address(sg), + sg_dma_len(sg), flags); + + } else { + ret = sun6i_dma_cfg_lli(v_lli, sconfig->src_addr, + sg_dma_address(sg), sg_dma_len(sg), + sconfig); + if (ret) + goto err_cur_lli_free; + + v_lli->cfg |= DMA_CHAN_CFG_DST_LINEAR_MODE | + DMA_CHAN_CFG_SRC_IO_MODE | + DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) | + DMA_CHAN_CFG_SRC_DRQ(vchan->port); + + dev_dbg(chan2dev(chan), + "%s; chan: %d, dest: %pad, src: %pad, len: %u. flags: 0x%08lx\n", + __func__, vchan->vc.chan.chan_id, + &sg_dma_address(sg), &sconfig->src_addr, + sg_dma_len(sg), flags); + } + + prev = sun6i_dma_lli_add(prev, v_lli, p_lli, txd); + } + + dev_dbg(chan2dev(chan), "First: %pad\n", &txd->p_lli); + for (prev = txd->v_lli; prev; prev = prev->v_lli_next) + sun6i_dma_dump_lli(vchan, prev); + + return vchan_tx_prep(&vchan->vc, &txd->vd, flags); + +err_cur_lli_free: + dma_pool_free(sdev->pool, v_lli, p_lli); +err_lli_free: + for (prev = txd->v_lli; prev; prev = prev->v_lli_next) + dma_pool_free(sdev->pool, prev, virt_to_phys(prev)); + kfree(txd); + return NULL; +} + +static int sun6i_dma_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + + memcpy(&vchan->cfg, config, sizeof(*config)); + + return 0; +} + +static int sun6i_dma_pause(struct dma_chan *chan) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + struct sun6i_pchan *pchan = vchan->phy; + + dev_dbg(chan2dev(chan), "vchan %p: pause\n", &vchan->vc); + + if (pchan) { + writel(DMA_CHAN_PAUSE_PAUSE, + pchan->base + DMA_CHAN_PAUSE); + } else { + spin_lock(&sdev->lock); + list_del_init(&vchan->node); + spin_unlock(&sdev->lock); + } + + return 0; +} + +static int sun6i_dma_resume(struct dma_chan *chan) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + struct sun6i_pchan *pchan = vchan->phy; + unsigned long flags; + + dev_dbg(chan2dev(chan), "vchan %p: resume\n", &vchan->vc); + + spin_lock_irqsave(&vchan->vc.lock, flags); + + if (pchan) { + writel(DMA_CHAN_PAUSE_RESUME, + pchan->base + DMA_CHAN_PAUSE); + } else if (!list_empty(&vchan->vc.desc_issued)) { + spin_lock(&sdev->lock); + list_add_tail(&vchan->node, &sdev->pending); + spin_unlock(&sdev->lock); + } + + spin_unlock_irqrestore(&vchan->vc.lock, flags); + + return 0; +} + +static int sun6i_dma_terminate_all(struct dma_chan *chan) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + struct sun6i_pchan *pchan = vchan->phy; + unsigned long flags; + LIST_HEAD(head); + + spin_lock(&sdev->lock); + list_del_init(&vchan->node); + spin_unlock(&sdev->lock); + + spin_lock_irqsave(&vchan->vc.lock, flags); + + vchan_get_all_descriptors(&vchan->vc, &head); + + if (pchan) { + writel(DMA_CHAN_ENABLE_STOP, pchan->base + DMA_CHAN_ENABLE); + writel(DMA_CHAN_PAUSE_RESUME, pchan->base + DMA_CHAN_PAUSE); + + vchan->phy = NULL; + pchan->vchan = NULL; + pchan->desc = NULL; + pchan->done = NULL; + } + + spin_unlock_irqrestore(&vchan->vc.lock, flags); + + vchan_dma_desc_free_list(&vchan->vc, &head); + + return 0; +} + +static enum dma_status sun6i_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *state) +{ + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + struct sun6i_pchan *pchan = vchan->phy; + struct sun6i_dma_lli *lli; + struct virt_dma_desc *vd; + struct sun6i_desc *txd; + enum dma_status ret; + unsigned long flags; + size_t bytes = 0; + + ret = dma_cookie_status(chan, cookie, state); + if (ret == DMA_COMPLETE) + return ret; + + spin_lock_irqsave(&vchan->vc.lock, flags); + + vd = vchan_find_desc(&vchan->vc, cookie); + txd = to_sun6i_desc(&vd->tx); + + if (vd) { + for (lli = txd->v_lli; lli != NULL; lli = lli->v_lli_next) + bytes += lli->len; + } else if (!pchan || !pchan->desc) { + bytes = 0; + } else { + bytes = readl(pchan->base + DMA_CHAN_CUR_CNT); + } + + spin_unlock_irqrestore(&vchan->vc.lock, flags); + + dma_set_residue(state, bytes); + + return ret; +} + +static void sun6i_dma_issue_pending(struct dma_chan *chan) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + unsigned long flags; + + spin_lock_irqsave(&vchan->vc.lock, flags); + + if (vchan_issue_pending(&vchan->vc)) { + spin_lock(&sdev->lock); + + if (!vchan->phy && list_empty(&vchan->node)) { + list_add_tail(&vchan->node, &sdev->pending); + tasklet_schedule(&sdev->task); + dev_dbg(chan2dev(chan), "vchan %p: issued\n", + &vchan->vc); + } + + spin_unlock(&sdev->lock); + } else { + dev_dbg(chan2dev(chan), "vchan %p: nothing to issue\n", + &vchan->vc); + } + + spin_unlock_irqrestore(&vchan->vc.lock, flags); +} + +static void sun6i_dma_free_chan_resources(struct dma_chan *chan) +{ + struct sun6i_dma_dev *sdev = to_sun6i_dma_dev(chan->device); + struct sun6i_vchan *vchan = to_sun6i_vchan(chan); + unsigned long flags; + + spin_lock_irqsave(&sdev->lock, flags); + list_del_init(&vchan->node); + spin_unlock_irqrestore(&sdev->lock, flags); + + vchan_free_chan_resources(&vchan->vc); +} + +static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct sun6i_dma_dev *sdev = ofdma->of_dma_data; + struct sun6i_vchan *vchan; + struct dma_chan *chan; + u8 port = dma_spec->args[0]; + + if (port > sdev->cfg->nr_max_requests) + return NULL; + + chan = dma_get_any_slave_channel(&sdev->slave); + if (!chan) + return NULL; + + vchan = to_sun6i_vchan(chan); + vchan->port = port; + + return chan; +} + +static inline void sun6i_kill_tasklet(struct sun6i_dma_dev *sdev) +{ + /* Disable all interrupts from DMA */ + writel(0, sdev->base + DMA_IRQ_EN(0)); + writel(0, sdev->base + DMA_IRQ_EN(1)); + + /* Prevent spurious interrupts from scheduling the tasklet */ + atomic_inc(&sdev->tasklet_shutdown); + + /* Make sure we won't have any further interrupts */ + devm_free_irq(sdev->slave.dev, sdev->irq, sdev); + + /* Actually prevent the tasklet from being scheduled */ + tasklet_kill(&sdev->task); +} + +static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev) +{ + int i; + + for (i = 0; i < sdev->cfg->nr_max_vchans; i++) { + struct sun6i_vchan *vchan = &sdev->vchans[i]; + + list_del(&vchan->vc.chan.device_node); + tasklet_kill(&vchan->vc.task); + } +} + +/* + * For A31: + * + * There's 16 physical channels that can work in parallel. + * + * However we have 30 different endpoints for our requests. + * + * Since the channels are able to handle only an unidirectional + * transfer, we need to allocate more virtual channels so that + * everyone can grab one channel. + * + * Some devices can't work in both direction (mostly because it + * wouldn't make sense), so we have a bit fewer virtual channels than + * 2 channels per endpoints. + */ + +static struct sun6i_dma_config sun6i_a31_dma_cfg = { + .nr_max_channels = 16, + .nr_max_requests = 30, + .nr_max_vchans = 53, +}; + +/* + * The A23 only has 8 physical channels, a maximum DRQ port id of 24, + * and a total of 37 usable source and destination endpoints. + */ + +static struct sun6i_dma_config sun8i_a23_dma_cfg = { + .nr_max_channels = 8, + .nr_max_requests = 24, + .nr_max_vchans = 37, +}; + +static const struct of_device_id sun6i_dma_match[] = { + { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg }, + { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg }, + { /* sentinel */ } +}; + +static int sun6i_dma_probe(struct platform_device *pdev) +{ + const struct of_device_id *device; + struct sun6i_dma_dev *sdc; + struct resource *res; + int ret, i; + + sdc = devm_kzalloc(&pdev->dev, sizeof(*sdc), GFP_KERNEL); + if (!sdc) + return -ENOMEM; + + device = of_match_device(sun6i_dma_match, &pdev->dev); + if (!device) + return -ENODEV; + sdc->cfg = device->data; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + sdc->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(sdc->base)) + return PTR_ERR(sdc->base); + + sdc->irq = platform_get_irq(pdev, 0); + if (sdc->irq < 0) { + dev_err(&pdev->dev, "Cannot claim IRQ\n"); + return sdc->irq; + } + + sdc->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(sdc->clk)) { + dev_err(&pdev->dev, "No clock specified\n"); + return PTR_ERR(sdc->clk); + } + + sdc->rstc = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(sdc->rstc)) { + dev_err(&pdev->dev, "No reset controller specified\n"); + return PTR_ERR(sdc->rstc); + } + + sdc->pool = dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, + sizeof(struct sun6i_dma_lli), 4, 0); + if (!sdc->pool) { + dev_err(&pdev->dev, "No memory for descriptors dma pool\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, sdc); + INIT_LIST_HEAD(&sdc->pending); + spin_lock_init(&sdc->lock); + + dma_cap_set(DMA_PRIVATE, sdc->slave.cap_mask); + dma_cap_set(DMA_MEMCPY, sdc->slave.cap_mask); + dma_cap_set(DMA_SLAVE, sdc->slave.cap_mask); + + INIT_LIST_HEAD(&sdc->slave.channels); + sdc->slave.device_free_chan_resources = sun6i_dma_free_chan_resources; + sdc->slave.device_tx_status = sun6i_dma_tx_status; + sdc->slave.device_issue_pending = sun6i_dma_issue_pending; + sdc->slave.device_prep_slave_sg = sun6i_dma_prep_slave_sg; + sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy; + sdc->slave.copy_align = 4; + sdc->slave.device_config = sun6i_dma_config; + sdc->slave.device_pause = sun6i_dma_pause; + sdc->slave.device_resume = sun6i_dma_resume; + sdc->slave.device_terminate_all = sun6i_dma_terminate_all; + sdc->slave.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + sdc->slave.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + sdc->slave.directions = BIT(DMA_DEV_TO_MEM) | + BIT(DMA_MEM_TO_DEV); + sdc->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + sdc->slave.dev = &pdev->dev; + + sdc->pchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_channels, + sizeof(struct sun6i_pchan), GFP_KERNEL); + if (!sdc->pchans) + return -ENOMEM; + + sdc->vchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_vchans, + sizeof(struct sun6i_vchan), GFP_KERNEL); + if (!sdc->vchans) + return -ENOMEM; + + tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc); + + for (i = 0; i < sdc->cfg->nr_max_channels; i++) { + struct sun6i_pchan *pchan = &sdc->pchans[i]; + + pchan->idx = i; + pchan->base = sdc->base + 0x100 + i * 0x40; + } + + for (i = 0; i < sdc->cfg->nr_max_vchans; i++) { + struct sun6i_vchan *vchan = &sdc->vchans[i]; + + INIT_LIST_HEAD(&vchan->node); + vchan->vc.desc_free = sun6i_dma_free_desc; + vchan_init(&vchan->vc, &sdc->slave); + } + + ret = reset_control_deassert(sdc->rstc); + if (ret) { + dev_err(&pdev->dev, "Couldn't deassert the device from reset\n"); + goto err_chan_free; + } + + ret = clk_prepare_enable(sdc->clk); + if (ret) { + dev_err(&pdev->dev, "Couldn't enable the clock\n"); + goto err_reset_assert; + } + + ret = devm_request_irq(&pdev->dev, sdc->irq, sun6i_dma_interrupt, 0, + dev_name(&pdev->dev), sdc); + if (ret) { + dev_err(&pdev->dev, "Cannot request IRQ\n"); + goto err_clk_disable; + } + + ret = dma_async_device_register(&sdc->slave); + if (ret) { + dev_warn(&pdev->dev, "Failed to register DMA engine device\n"); + goto err_irq_disable; + } + + ret = of_dma_controller_register(pdev->dev.of_node, sun6i_dma_of_xlate, + sdc); + if (ret) { + dev_err(&pdev->dev, "of_dma_controller_register failed\n"); + goto err_dma_unregister; + } + + /* + * sun8i variant requires us to toggle a dma gating register, + * as seen in Allwinner's SDK. This register is not documented + * in the A23 user manual. + */ + if (of_device_is_compatible(pdev->dev.of_node, + "allwinner,sun8i-a23-dma")) + writel(SUN8I_DMA_GATE_ENABLE, sdc->base + SUN8I_DMA_GATE); + + return 0; + +err_dma_unregister: + dma_async_device_unregister(&sdc->slave); +err_irq_disable: + sun6i_kill_tasklet(sdc); +err_clk_disable: + clk_disable_unprepare(sdc->clk); +err_reset_assert: + reset_control_assert(sdc->rstc); +err_chan_free: + sun6i_dma_free(sdc); + return ret; +} + +static int sun6i_dma_remove(struct platform_device *pdev) +{ + struct sun6i_dma_dev *sdc = platform_get_drvdata(pdev); + + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&sdc->slave); + + sun6i_kill_tasklet(sdc); + + clk_disable_unprepare(sdc->clk); + reset_control_assert(sdc->rstc); + + sun6i_dma_free(sdc); + + return 0; +} + +static struct platform_driver sun6i_dma_driver = { + .probe = sun6i_dma_probe, + .remove = sun6i_dma_remove, + .driver = { + .name = "sun6i-dma", + .of_match_table = sun6i_dma_match, + }, +}; +module_platform_driver(sun6i_dma_driver); + +MODULE_DESCRIPTION("Allwinner A31 DMA Controller Driver"); +MODULE_AUTHOR("Sugar <shuge@allwinnertech.com>"); +MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c new file mode 100644 index 000000000..eaf585e82 --- /dev/null +++ b/drivers/dma/tegra20-apb-dma.c @@ -0,0 +1,1610 @@ +/* + * DMA driver for Nvidia's Tegra20 APB DMA controller. + * + * Copyright (c) 2012-2013, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> +#include <linux/slab.h> + +#include "dmaengine.h" + +#define TEGRA_APBDMA_GENERAL 0x0 +#define TEGRA_APBDMA_GENERAL_ENABLE BIT(31) + +#define TEGRA_APBDMA_CONTROL 0x010 +#define TEGRA_APBDMA_IRQ_MASK 0x01c +#define TEGRA_APBDMA_IRQ_MASK_SET 0x020 + +/* CSR register */ +#define TEGRA_APBDMA_CHAN_CSR 0x00 +#define TEGRA_APBDMA_CSR_ENB BIT(31) +#define TEGRA_APBDMA_CSR_IE_EOC BIT(30) +#define TEGRA_APBDMA_CSR_HOLD BIT(29) +#define TEGRA_APBDMA_CSR_DIR BIT(28) +#define TEGRA_APBDMA_CSR_ONCE BIT(27) +#define TEGRA_APBDMA_CSR_FLOW BIT(21) +#define TEGRA_APBDMA_CSR_REQ_SEL_SHIFT 16 +#define TEGRA_APBDMA_CSR_WCOUNT_MASK 0xFFFC + +/* STATUS register */ +#define TEGRA_APBDMA_CHAN_STATUS 0x004 +#define TEGRA_APBDMA_STATUS_BUSY BIT(31) +#define TEGRA_APBDMA_STATUS_ISE_EOC BIT(30) +#define TEGRA_APBDMA_STATUS_HALT BIT(29) +#define TEGRA_APBDMA_STATUS_PING_PONG BIT(28) +#define TEGRA_APBDMA_STATUS_COUNT_SHIFT 2 +#define TEGRA_APBDMA_STATUS_COUNT_MASK 0xFFFC + +#define TEGRA_APBDMA_CHAN_CSRE 0x00C +#define TEGRA_APBDMA_CHAN_CSRE_PAUSE (1 << 31) + +/* AHB memory address */ +#define TEGRA_APBDMA_CHAN_AHBPTR 0x010 + +/* AHB sequence register */ +#define TEGRA_APBDMA_CHAN_AHBSEQ 0x14 +#define TEGRA_APBDMA_AHBSEQ_INTR_ENB BIT(31) +#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_8 (0 << 28) +#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_16 (1 << 28) +#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32 (2 << 28) +#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_64 (3 << 28) +#define TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_128 (4 << 28) +#define TEGRA_APBDMA_AHBSEQ_DATA_SWAP BIT(27) +#define TEGRA_APBDMA_AHBSEQ_BURST_1 (4 << 24) +#define TEGRA_APBDMA_AHBSEQ_BURST_4 (5 << 24) +#define TEGRA_APBDMA_AHBSEQ_BURST_8 (6 << 24) +#define TEGRA_APBDMA_AHBSEQ_DBL_BUF BIT(19) +#define TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT 16 +#define TEGRA_APBDMA_AHBSEQ_WRAP_NONE 0 + +/* APB address */ +#define TEGRA_APBDMA_CHAN_APBPTR 0x018 + +/* APB sequence register */ +#define TEGRA_APBDMA_CHAN_APBSEQ 0x01c +#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8 (0 << 28) +#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16 (1 << 28) +#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32 (2 << 28) +#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64 (3 << 28) +#define TEGRA_APBDMA_APBSEQ_BUS_WIDTH_128 (4 << 28) +#define TEGRA_APBDMA_APBSEQ_DATA_SWAP BIT(27) +#define TEGRA_APBDMA_APBSEQ_WRAP_WORD_1 (1 << 16) + +/* Tegra148 specific registers */ +#define TEGRA_APBDMA_CHAN_WCOUNT 0x20 + +#define TEGRA_APBDMA_CHAN_WORD_TRANSFER 0x24 + +/* + * If any burst is in flight and DMA paused then this is the time to complete + * on-flight burst and update DMA status register. + */ +#define TEGRA_APBDMA_BURST_COMPLETE_TIME 20 + +/* Channel base address offset from APBDMA base address */ +#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000 + +struct tegra_dma; + +/* + * tegra_dma_chip_data Tegra chip specific DMA data + * @nr_channels: Number of channels available in the controller. + * @channel_reg_size: Channel register size/stride. + * @max_dma_count: Maximum DMA transfer count supported by DMA controller. + * @support_channel_pause: Support channel wise pause of dma. + * @support_separate_wcount_reg: Support separate word count register. + */ +struct tegra_dma_chip_data { + int nr_channels; + int channel_reg_size; + int max_dma_count; + bool support_channel_pause; + bool support_separate_wcount_reg; +}; + +/* DMA channel registers */ +struct tegra_dma_channel_regs { + unsigned long csr; + unsigned long ahb_ptr; + unsigned long apb_ptr; + unsigned long ahb_seq; + unsigned long apb_seq; + unsigned long wcount; +}; + +/* + * tegra_dma_sg_req: Dma request details to configure hardware. This + * contains the details for one transfer to configure DMA hw. + * The client's request for data transfer can be broken into multiple + * sub-transfer as per requester details and hw support. + * This sub transfer get added in the list of transfer and point to Tegra + * DMA descriptor which manages the transfer details. + */ +struct tegra_dma_sg_req { + struct tegra_dma_channel_regs ch_regs; + int req_len; + bool configured; + bool last_sg; + bool half_done; + struct list_head node; + struct tegra_dma_desc *dma_desc; +}; + +/* + * tegra_dma_desc: Tegra DMA descriptors which manages the client requests. + * This descriptor keep track of transfer status, callbacks and request + * counts etc. + */ +struct tegra_dma_desc { + struct dma_async_tx_descriptor txd; + int bytes_requested; + int bytes_transferred; + enum dma_status dma_status; + struct list_head node; + struct list_head tx_list; + struct list_head cb_node; + int cb_count; +}; + +struct tegra_dma_channel; + +typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc, + bool to_terminate); + +/* tegra_dma_channel: Channel specific information */ +struct tegra_dma_channel { + struct dma_chan dma_chan; + char name[30]; + bool config_init; + int id; + int irq; + unsigned long chan_base_offset; + spinlock_t lock; + bool busy; + struct tegra_dma *tdma; + bool cyclic; + + /* Different lists for managing the requests */ + struct list_head free_sg_req; + struct list_head pending_sg_req; + struct list_head free_dma_desc; + struct list_head cb_desc; + + /* ISR handler and tasklet for bottom half of isr handling */ + dma_isr_handler isr_handler; + struct tasklet_struct tasklet; + dma_async_tx_callback callback; + void *callback_param; + + /* Channel-slave specific configuration */ + unsigned int slave_id; + struct dma_slave_config dma_sconfig; + struct tegra_dma_channel_regs channel_reg; +}; + +/* tegra_dma: Tegra DMA specific information */ +struct tegra_dma { + struct dma_device dma_dev; + struct device *dev; + struct clk *dma_clk; + struct reset_control *rst; + spinlock_t global_lock; + void __iomem *base_addr; + const struct tegra_dma_chip_data *chip_data; + + /* Some register need to be cache before suspend */ + u32 reg_gen; + + /* Last member of the structure */ + struct tegra_dma_channel channels[0]; +}; + +static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val) +{ + writel(val, tdma->base_addr + reg); +} + +static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg) +{ + return readl(tdma->base_addr + reg); +} + +static inline void tdc_write(struct tegra_dma_channel *tdc, + u32 reg, u32 val) +{ + writel(val, tdc->tdma->base_addr + tdc->chan_base_offset + reg); +} + +static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg) +{ + return readl(tdc->tdma->base_addr + tdc->chan_base_offset + reg); +} + +static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc) +{ + return container_of(dc, struct tegra_dma_channel, dma_chan); +} + +static inline struct tegra_dma_desc *txd_to_tegra_dma_desc( + struct dma_async_tx_descriptor *td) +{ + return container_of(td, struct tegra_dma_desc, txd); +} + +static inline struct device *tdc2dev(struct tegra_dma_channel *tdc) +{ + return &tdc->dma_chan.dev->device; +} + +static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *tx); +static int tegra_dma_runtime_suspend(struct device *dev); +static int tegra_dma_runtime_resume(struct device *dev); + +/* Get DMA desc from free list, if not there then allocate it. */ +static struct tegra_dma_desc *tegra_dma_desc_get( + struct tegra_dma_channel *tdc) +{ + struct tegra_dma_desc *dma_desc; + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + + /* Do not allocate if desc are waiting for ack */ + list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) { + if (async_tx_test_ack(&dma_desc->txd)) { + list_del(&dma_desc->node); + spin_unlock_irqrestore(&tdc->lock, flags); + dma_desc->txd.flags = 0; + return dma_desc; + } + } + + spin_unlock_irqrestore(&tdc->lock, flags); + + /* Allocate DMA desc */ + dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC); + if (!dma_desc) { + dev_err(tdc2dev(tdc), "dma_desc alloc failed\n"); + return NULL; + } + + dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan); + dma_desc->txd.tx_submit = tegra_dma_tx_submit; + dma_desc->txd.flags = 0; + return dma_desc; +} + +static void tegra_dma_desc_put(struct tegra_dma_channel *tdc, + struct tegra_dma_desc *dma_desc) +{ + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + if (!list_empty(&dma_desc->tx_list)) + list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req); + list_add_tail(&dma_desc->node, &tdc->free_dma_desc); + spin_unlock_irqrestore(&tdc->lock, flags); +} + +static struct tegra_dma_sg_req *tegra_dma_sg_req_get( + struct tegra_dma_channel *tdc) +{ + struct tegra_dma_sg_req *sg_req = NULL; + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + if (!list_empty(&tdc->free_sg_req)) { + sg_req = list_first_entry(&tdc->free_sg_req, + typeof(*sg_req), node); + list_del(&sg_req->node); + spin_unlock_irqrestore(&tdc->lock, flags); + return sg_req; + } + spin_unlock_irqrestore(&tdc->lock, flags); + + sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC); + if (!sg_req) + dev_err(tdc2dev(tdc), "sg_req alloc failed\n"); + return sg_req; +} + +static int tegra_dma_slave_config(struct dma_chan *dc, + struct dma_slave_config *sconfig) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + + if (!list_empty(&tdc->pending_sg_req)) { + dev_err(tdc2dev(tdc), "Configuration not allowed\n"); + return -EBUSY; + } + + memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig)); + if (!tdc->slave_id) + tdc->slave_id = sconfig->slave_id; + tdc->config_init = true; + return 0; +} + +static void tegra_dma_global_pause(struct tegra_dma_channel *tdc, + bool wait_for_burst_complete) +{ + struct tegra_dma *tdma = tdc->tdma; + + spin_lock(&tdma->global_lock); + tdma_write(tdma, TEGRA_APBDMA_GENERAL, 0); + if (wait_for_burst_complete) + udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME); +} + +static void tegra_dma_global_resume(struct tegra_dma_channel *tdc) +{ + struct tegra_dma *tdma = tdc->tdma; + + tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE); + spin_unlock(&tdma->global_lock); +} + +static void tegra_dma_pause(struct tegra_dma_channel *tdc, + bool wait_for_burst_complete) +{ + struct tegra_dma *tdma = tdc->tdma; + + if (tdma->chip_data->support_channel_pause) { + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, + TEGRA_APBDMA_CHAN_CSRE_PAUSE); + if (wait_for_burst_complete) + udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME); + } else { + tegra_dma_global_pause(tdc, wait_for_burst_complete); + } +} + +static void tegra_dma_resume(struct tegra_dma_channel *tdc) +{ + struct tegra_dma *tdma = tdc->tdma; + + if (tdma->chip_data->support_channel_pause) { + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, 0); + } else { + tegra_dma_global_resume(tdc); + } +} + +static void tegra_dma_stop(struct tegra_dma_channel *tdc) +{ + u32 csr; + u32 status; + + /* Disable interrupts */ + csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR); + csr &= ~TEGRA_APBDMA_CSR_IE_EOC; + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr); + + /* Disable DMA */ + csr &= ~TEGRA_APBDMA_CSR_ENB; + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, csr); + + /* Clear interrupt status if it is there */ + status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS); + if (status & TEGRA_APBDMA_STATUS_ISE_EOC) { + dev_dbg(tdc2dev(tdc), "%s():clearing interrupt\n", __func__); + tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status); + } + tdc->busy = false; +} + +static void tegra_dma_start(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *sg_req) +{ + struct tegra_dma_channel_regs *ch_regs = &sg_req->ch_regs; + + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, ch_regs->csr); + tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_regs->apb_seq); + tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_regs->apb_ptr); + tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_regs->ahb_seq); + tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_regs->ahb_ptr); + if (tdc->tdma->chip_data->support_separate_wcount_reg) + tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT, ch_regs->wcount); + + /* Start DMA */ + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, + ch_regs->csr | TEGRA_APBDMA_CSR_ENB); +} + +static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *nsg_req) +{ + unsigned long status; + + /* + * The DMA controller reloads the new configuration for next transfer + * after last burst of current transfer completes. + * If there is no IEC status then this makes sure that last burst + * has not be completed. There may be case that last burst is on + * flight and so it can complete but because DMA is paused, it + * will not generates interrupt as well as not reload the new + * configuration. + * If there is already IEC status then interrupt handler need to + * load new configuration. + */ + tegra_dma_pause(tdc, false); + status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS); + + /* + * If interrupt is pending then do nothing as the ISR will handle + * the programing for new request. + */ + if (status & TEGRA_APBDMA_STATUS_ISE_EOC) { + dev_err(tdc2dev(tdc), + "Skipping new configuration as interrupt is pending\n"); + tegra_dma_resume(tdc); + return; + } + + /* Safe to program new configuration */ + tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr); + tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr); + if (tdc->tdma->chip_data->support_separate_wcount_reg) + tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT, + nsg_req->ch_regs.wcount); + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, + nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB); + nsg_req->configured = true; + + tegra_dma_resume(tdc); +} + +static void tdc_start_head_req(struct tegra_dma_channel *tdc) +{ + struct tegra_dma_sg_req *sg_req; + + if (list_empty(&tdc->pending_sg_req)) + return; + + sg_req = list_first_entry(&tdc->pending_sg_req, + typeof(*sg_req), node); + tegra_dma_start(tdc, sg_req); + sg_req->configured = true; + tdc->busy = true; +} + +static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc) +{ + struct tegra_dma_sg_req *hsgreq; + struct tegra_dma_sg_req *hnsgreq; + + if (list_empty(&tdc->pending_sg_req)) + return; + + hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node); + if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) { + hnsgreq = list_first_entry(&hsgreq->node, + typeof(*hnsgreq), node); + tegra_dma_configure_for_next(tdc, hnsgreq); + } +} + +static inline int get_current_xferred_count(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *sg_req, unsigned long status) +{ + return sg_req->req_len - (status & TEGRA_APBDMA_STATUS_COUNT_MASK) - 4; +} + +static void tegra_dma_abort_all(struct tegra_dma_channel *tdc) +{ + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + + while (!list_empty(&tdc->pending_sg_req)) { + sgreq = list_first_entry(&tdc->pending_sg_req, + typeof(*sgreq), node); + list_move_tail(&sgreq->node, &tdc->free_sg_req); + if (sgreq->last_sg) { + dma_desc = sgreq->dma_desc; + dma_desc->dma_status = DMA_ERROR; + list_add_tail(&dma_desc->node, &tdc->free_dma_desc); + + /* Add in cb list if it is not there. */ + if (!dma_desc->cb_count) + list_add_tail(&dma_desc->cb_node, + &tdc->cb_desc); + dma_desc->cb_count++; + } + } + tdc->isr_handler = NULL; +} + +static bool handle_continuous_head_request(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *last_sg_req, bool to_terminate) +{ + struct tegra_dma_sg_req *hsgreq = NULL; + + if (list_empty(&tdc->pending_sg_req)) { + dev_err(tdc2dev(tdc), "Dma is running without req\n"); + tegra_dma_stop(tdc); + return false; + } + + /* + * Check that head req on list should be in flight. + * If it is not in flight then abort transfer as + * looping of transfer can not continue. + */ + hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node); + if (!hsgreq->configured) { + tegra_dma_stop(tdc); + dev_err(tdc2dev(tdc), "Error in dma transfer, aborting dma\n"); + tegra_dma_abort_all(tdc); + return false; + } + + /* Configure next request */ + if (!to_terminate) + tdc_configure_next_head_desc(tdc); + return true; +} + +static void handle_once_dma_done(struct tegra_dma_channel *tdc, + bool to_terminate) +{ + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + + tdc->busy = false; + sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node); + dma_desc = sgreq->dma_desc; + dma_desc->bytes_transferred += sgreq->req_len; + + list_del(&sgreq->node); + if (sgreq->last_sg) { + dma_desc->dma_status = DMA_COMPLETE; + dma_cookie_complete(&dma_desc->txd); + if (!dma_desc->cb_count) + list_add_tail(&dma_desc->cb_node, &tdc->cb_desc); + dma_desc->cb_count++; + list_add_tail(&dma_desc->node, &tdc->free_dma_desc); + } + list_add_tail(&sgreq->node, &tdc->free_sg_req); + + /* Do not start DMA if it is going to be terminate */ + if (to_terminate || list_empty(&tdc->pending_sg_req)) + return; + + tdc_start_head_req(tdc); + return; +} + +static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc, + bool to_terminate) +{ + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + bool st; + + sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node); + dma_desc = sgreq->dma_desc; + dma_desc->bytes_transferred += sgreq->req_len; + + /* Callback need to be call */ + if (!dma_desc->cb_count) + list_add_tail(&dma_desc->cb_node, &tdc->cb_desc); + dma_desc->cb_count++; + + /* If not last req then put at end of pending list */ + if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) { + list_move_tail(&sgreq->node, &tdc->pending_sg_req); + sgreq->configured = false; + st = handle_continuous_head_request(tdc, sgreq, to_terminate); + if (!st) + dma_desc->dma_status = DMA_ERROR; + } + return; +} + +static void tegra_dma_tasklet(unsigned long data) +{ + struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data; + dma_async_tx_callback callback = NULL; + void *callback_param = NULL; + struct tegra_dma_desc *dma_desc; + unsigned long flags; + int cb_count; + + spin_lock_irqsave(&tdc->lock, flags); + while (!list_empty(&tdc->cb_desc)) { + dma_desc = list_first_entry(&tdc->cb_desc, + typeof(*dma_desc), cb_node); + list_del(&dma_desc->cb_node); + callback = dma_desc->txd.callback; + callback_param = dma_desc->txd.callback_param; + cb_count = dma_desc->cb_count; + dma_desc->cb_count = 0; + spin_unlock_irqrestore(&tdc->lock, flags); + while (cb_count-- && callback) + callback(callback_param); + spin_lock_irqsave(&tdc->lock, flags); + } + spin_unlock_irqrestore(&tdc->lock, flags); +} + +static irqreturn_t tegra_dma_isr(int irq, void *dev_id) +{ + struct tegra_dma_channel *tdc = dev_id; + unsigned long status; + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + + status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS); + if (status & TEGRA_APBDMA_STATUS_ISE_EOC) { + tdc_write(tdc, TEGRA_APBDMA_CHAN_STATUS, status); + tdc->isr_handler(tdc, false); + tasklet_schedule(&tdc->tasklet); + spin_unlock_irqrestore(&tdc->lock, flags); + return IRQ_HANDLED; + } + + spin_unlock_irqrestore(&tdc->lock, flags); + dev_info(tdc2dev(tdc), + "Interrupt already served status 0x%08lx\n", status); + return IRQ_NONE; +} + +static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd) +{ + struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd); + struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan); + unsigned long flags; + dma_cookie_t cookie; + + spin_lock_irqsave(&tdc->lock, flags); + dma_desc->dma_status = DMA_IN_PROGRESS; + cookie = dma_cookie_assign(&dma_desc->txd); + list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req); + spin_unlock_irqrestore(&tdc->lock, flags); + return cookie; +} + +static void tegra_dma_issue_pending(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + if (list_empty(&tdc->pending_sg_req)) { + dev_err(tdc2dev(tdc), "No DMA request\n"); + goto end; + } + if (!tdc->busy) { + tdc_start_head_req(tdc); + + /* Continuous single mode: Configure next req */ + if (tdc->cyclic) { + /* + * Wait for 1 burst time for configure DMA for + * next transfer. + */ + udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME); + tdc_configure_next_head_desc(tdc); + } + } +end: + spin_unlock_irqrestore(&tdc->lock, flags); + return; +} + +static int tegra_dma_terminate_all(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + unsigned long flags; + unsigned long status; + unsigned long wcount; + bool was_busy; + + spin_lock_irqsave(&tdc->lock, flags); + if (list_empty(&tdc->pending_sg_req)) { + spin_unlock_irqrestore(&tdc->lock, flags); + return 0; + } + + if (!tdc->busy) + goto skip_dma_stop; + + /* Pause DMA before checking the queue status */ + tegra_dma_pause(tdc, true); + + status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS); + if (status & TEGRA_APBDMA_STATUS_ISE_EOC) { + dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__); + tdc->isr_handler(tdc, true); + status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS); + } + if (tdc->tdma->chip_data->support_separate_wcount_reg) + wcount = tdc_read(tdc, TEGRA_APBDMA_CHAN_WORD_TRANSFER); + else + wcount = status; + + was_busy = tdc->busy; + tegra_dma_stop(tdc); + + if (!list_empty(&tdc->pending_sg_req) && was_busy) { + sgreq = list_first_entry(&tdc->pending_sg_req, + typeof(*sgreq), node); + sgreq->dma_desc->bytes_transferred += + get_current_xferred_count(tdc, sgreq, wcount); + } + tegra_dma_resume(tdc); + +skip_dma_stop: + tegra_dma_abort_all(tdc); + + while (!list_empty(&tdc->cb_desc)) { + dma_desc = list_first_entry(&tdc->cb_desc, + typeof(*dma_desc), cb_node); + list_del(&dma_desc->cb_node); + dma_desc->cb_count = 0; + } + spin_unlock_irqrestore(&tdc->lock, flags); + return 0; +} + +static enum dma_status tegra_dma_tx_status(struct dma_chan *dc, + dma_cookie_t cookie, struct dma_tx_state *txstate) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma_desc *dma_desc; + struct tegra_dma_sg_req *sg_req; + enum dma_status ret; + unsigned long flags; + unsigned int residual; + + ret = dma_cookie_status(dc, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + spin_lock_irqsave(&tdc->lock, flags); + + /* Check on wait_ack desc status */ + list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) { + if (dma_desc->txd.cookie == cookie) { + residual = dma_desc->bytes_requested - + (dma_desc->bytes_transferred % + dma_desc->bytes_requested); + dma_set_residue(txstate, residual); + ret = dma_desc->dma_status; + spin_unlock_irqrestore(&tdc->lock, flags); + return ret; + } + } + + /* Check in pending list */ + list_for_each_entry(sg_req, &tdc->pending_sg_req, node) { + dma_desc = sg_req->dma_desc; + if (dma_desc->txd.cookie == cookie) { + residual = dma_desc->bytes_requested - + (dma_desc->bytes_transferred % + dma_desc->bytes_requested); + dma_set_residue(txstate, residual); + ret = dma_desc->dma_status; + spin_unlock_irqrestore(&tdc->lock, flags); + return ret; + } + } + + dev_dbg(tdc2dev(tdc), "cookie %d does not found\n", cookie); + spin_unlock_irqrestore(&tdc->lock, flags); + return ret; +} + +static inline int get_bus_width(struct tegra_dma_channel *tdc, + enum dma_slave_buswidth slave_bw) +{ + switch (slave_bw) { + case DMA_SLAVE_BUSWIDTH_1_BYTE: + return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_8; + case DMA_SLAVE_BUSWIDTH_2_BYTES: + return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_16; + case DMA_SLAVE_BUSWIDTH_4_BYTES: + return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32; + case DMA_SLAVE_BUSWIDTH_8_BYTES: + return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_64; + default: + dev_warn(tdc2dev(tdc), + "slave bw is not supported, using 32bits\n"); + return TEGRA_APBDMA_APBSEQ_BUS_WIDTH_32; + } +} + +static inline int get_burst_size(struct tegra_dma_channel *tdc, + u32 burst_size, enum dma_slave_buswidth slave_bw, int len) +{ + int burst_byte; + int burst_ahb_width; + + /* + * burst_size from client is in terms of the bus_width. + * convert them into AHB memory width which is 4 byte. + */ + burst_byte = burst_size * slave_bw; + burst_ahb_width = burst_byte / 4; + + /* If burst size is 0 then calculate the burst size based on length */ + if (!burst_ahb_width) { + if (len & 0xF) + return TEGRA_APBDMA_AHBSEQ_BURST_1; + else if ((len >> 4) & 0x1) + return TEGRA_APBDMA_AHBSEQ_BURST_4; + else + return TEGRA_APBDMA_AHBSEQ_BURST_8; + } + if (burst_ahb_width < 4) + return TEGRA_APBDMA_AHBSEQ_BURST_1; + else if (burst_ahb_width < 8) + return TEGRA_APBDMA_AHBSEQ_BURST_4; + else + return TEGRA_APBDMA_AHBSEQ_BURST_8; +} + +static int get_transfer_param(struct tegra_dma_channel *tdc, + enum dma_transfer_direction direction, unsigned long *apb_addr, + unsigned long *apb_seq, unsigned long *csr, unsigned int *burst_size, + enum dma_slave_buswidth *slave_bw) +{ + + switch (direction) { + case DMA_MEM_TO_DEV: + *apb_addr = tdc->dma_sconfig.dst_addr; + *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.dst_addr_width); + *burst_size = tdc->dma_sconfig.dst_maxburst; + *slave_bw = tdc->dma_sconfig.dst_addr_width; + *csr = TEGRA_APBDMA_CSR_DIR; + return 0; + + case DMA_DEV_TO_MEM: + *apb_addr = tdc->dma_sconfig.src_addr; + *apb_seq = get_bus_width(tdc, tdc->dma_sconfig.src_addr_width); + *burst_size = tdc->dma_sconfig.src_maxburst; + *slave_bw = tdc->dma_sconfig.src_addr_width; + *csr = 0; + return 0; + + default: + dev_err(tdc2dev(tdc), "Dma direction is not supported\n"); + return -EINVAL; + } + return -EINVAL; +} + +static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc, + struct tegra_dma_channel_regs *ch_regs, u32 len) +{ + u32 len_field = (len - 4) & 0xFFFC; + + if (tdc->tdma->chip_data->support_separate_wcount_reg) + ch_regs->wcount = len_field; + else + ch_regs->csr |= len_field; +} + +static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg( + struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, + void *context) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma_desc *dma_desc; + unsigned int i; + struct scatterlist *sg; + unsigned long csr, ahb_seq, apb_ptr, apb_seq; + struct list_head req_list; + struct tegra_dma_sg_req *sg_req = NULL; + u32 burst_size; + enum dma_slave_buswidth slave_bw; + int ret; + + if (!tdc->config_init) { + dev_err(tdc2dev(tdc), "dma channel is not configured\n"); + return NULL; + } + if (sg_len < 1) { + dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len); + return NULL; + } + + ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr, + &burst_size, &slave_bw); + if (ret < 0) + return NULL; + + INIT_LIST_HEAD(&req_list); + + ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB; + ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE << + TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT; + ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32; + + csr |= TEGRA_APBDMA_CSR_ONCE | TEGRA_APBDMA_CSR_FLOW; + csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT; + if (flags & DMA_PREP_INTERRUPT) + csr |= TEGRA_APBDMA_CSR_IE_EOC; + + apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1; + + dma_desc = tegra_dma_desc_get(tdc); + if (!dma_desc) { + dev_err(tdc2dev(tdc), "Dma descriptors not available\n"); + return NULL; + } + INIT_LIST_HEAD(&dma_desc->tx_list); + INIT_LIST_HEAD(&dma_desc->cb_node); + dma_desc->cb_count = 0; + dma_desc->bytes_requested = 0; + dma_desc->bytes_transferred = 0; + dma_desc->dma_status = DMA_IN_PROGRESS; + + /* Make transfer requests */ + for_each_sg(sgl, sg, sg_len, i) { + u32 len, mem; + + mem = sg_dma_address(sg); + len = sg_dma_len(sg); + + if ((len & 3) || (mem & 3) || + (len > tdc->tdma->chip_data->max_dma_count)) { + dev_err(tdc2dev(tdc), + "Dma length/memory address is not supported\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + + sg_req = tegra_dma_sg_req_get(tdc); + if (!sg_req) { + dev_err(tdc2dev(tdc), "Dma sg-req not available\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + + ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len); + dma_desc->bytes_requested += len; + + sg_req->ch_regs.apb_ptr = apb_ptr; + sg_req->ch_regs.ahb_ptr = mem; + sg_req->ch_regs.csr = csr; + tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len); + sg_req->ch_regs.apb_seq = apb_seq; + sg_req->ch_regs.ahb_seq = ahb_seq; + sg_req->configured = false; + sg_req->last_sg = false; + sg_req->dma_desc = dma_desc; + sg_req->req_len = len; + + list_add_tail(&sg_req->node, &dma_desc->tx_list); + } + sg_req->last_sg = true; + if (flags & DMA_CTRL_ACK) + dma_desc->txd.flags = DMA_CTRL_ACK; + + /* + * Make sure that mode should not be conflicting with currently + * configured mode. + */ + if (!tdc->isr_handler) { + tdc->isr_handler = handle_once_dma_done; + tdc->cyclic = false; + } else { + if (tdc->cyclic) { + dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + } + + return &dma_desc->txd; +} + +static struct dma_async_tx_descriptor *tegra_dma_prep_dma_cyclic( + struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma_desc *dma_desc = NULL; + struct tegra_dma_sg_req *sg_req = NULL; + unsigned long csr, ahb_seq, apb_ptr, apb_seq; + int len; + size_t remain_len; + dma_addr_t mem = buf_addr; + u32 burst_size; + enum dma_slave_buswidth slave_bw; + int ret; + + if (!buf_len || !period_len) { + dev_err(tdc2dev(tdc), "Invalid buffer/period len\n"); + return NULL; + } + + if (!tdc->config_init) { + dev_err(tdc2dev(tdc), "DMA slave is not configured\n"); + return NULL; + } + + /* + * We allow to take more number of requests till DMA is + * not started. The driver will loop over all requests. + * Once DMA is started then new requests can be queued only after + * terminating the DMA. + */ + if (tdc->busy) { + dev_err(tdc2dev(tdc), "Request not allowed when dma running\n"); + return NULL; + } + + /* + * We only support cycle transfer when buf_len is multiple of + * period_len. + */ + if (buf_len % period_len) { + dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n"); + return NULL; + } + + len = period_len; + if ((len & 3) || (buf_addr & 3) || + (len > tdc->tdma->chip_data->max_dma_count)) { + dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n"); + return NULL; + } + + ret = get_transfer_param(tdc, direction, &apb_ptr, &apb_seq, &csr, + &burst_size, &slave_bw); + if (ret < 0) + return NULL; + + + ahb_seq = TEGRA_APBDMA_AHBSEQ_INTR_ENB; + ahb_seq |= TEGRA_APBDMA_AHBSEQ_WRAP_NONE << + TEGRA_APBDMA_AHBSEQ_WRAP_SHIFT; + ahb_seq |= TEGRA_APBDMA_AHBSEQ_BUS_WIDTH_32; + + csr |= TEGRA_APBDMA_CSR_FLOW; + if (flags & DMA_PREP_INTERRUPT) + csr |= TEGRA_APBDMA_CSR_IE_EOC; + csr |= tdc->slave_id << TEGRA_APBDMA_CSR_REQ_SEL_SHIFT; + + apb_seq |= TEGRA_APBDMA_APBSEQ_WRAP_WORD_1; + + dma_desc = tegra_dma_desc_get(tdc); + if (!dma_desc) { + dev_err(tdc2dev(tdc), "not enough descriptors available\n"); + return NULL; + } + + INIT_LIST_HEAD(&dma_desc->tx_list); + INIT_LIST_HEAD(&dma_desc->cb_node); + dma_desc->cb_count = 0; + + dma_desc->bytes_transferred = 0; + dma_desc->bytes_requested = buf_len; + remain_len = buf_len; + + /* Split transfer equal to period size */ + while (remain_len) { + sg_req = tegra_dma_sg_req_get(tdc); + if (!sg_req) { + dev_err(tdc2dev(tdc), "Dma sg-req not available\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + + ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len); + sg_req->ch_regs.apb_ptr = apb_ptr; + sg_req->ch_regs.ahb_ptr = mem; + sg_req->ch_regs.csr = csr; + tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len); + sg_req->ch_regs.apb_seq = apb_seq; + sg_req->ch_regs.ahb_seq = ahb_seq; + sg_req->configured = false; + sg_req->half_done = false; + sg_req->last_sg = false; + sg_req->dma_desc = dma_desc; + sg_req->req_len = len; + + list_add_tail(&sg_req->node, &dma_desc->tx_list); + remain_len -= len; + mem += len; + } + sg_req->last_sg = true; + if (flags & DMA_CTRL_ACK) + dma_desc->txd.flags = DMA_CTRL_ACK; + + /* + * Make sure that mode should not be conflicting with currently + * configured mode. + */ + if (!tdc->isr_handler) { + tdc->isr_handler = handle_cont_sngl_cycle_dma_done; + tdc->cyclic = true; + } else { + if (!tdc->cyclic) { + dev_err(tdc2dev(tdc), "DMA configuration conflict\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + } + + return &dma_desc->txd; +} + +static int tegra_dma_alloc_chan_resources(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma *tdma = tdc->tdma; + int ret; + + dma_cookie_init(&tdc->dma_chan); + tdc->config_init = false; + ret = clk_prepare_enable(tdma->dma_clk); + if (ret < 0) + dev_err(tdc2dev(tdc), "clk_prepare_enable failed: %d\n", ret); + return ret; +} + +static void tegra_dma_free_chan_resources(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma *tdma = tdc->tdma; + + struct tegra_dma_desc *dma_desc; + struct tegra_dma_sg_req *sg_req; + struct list_head dma_desc_list; + struct list_head sg_req_list; + unsigned long flags; + + INIT_LIST_HEAD(&dma_desc_list); + INIT_LIST_HEAD(&sg_req_list); + + dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id); + + if (tdc->busy) + tegra_dma_terminate_all(dc); + + spin_lock_irqsave(&tdc->lock, flags); + list_splice_init(&tdc->pending_sg_req, &sg_req_list); + list_splice_init(&tdc->free_sg_req, &sg_req_list); + list_splice_init(&tdc->free_dma_desc, &dma_desc_list); + INIT_LIST_HEAD(&tdc->cb_desc); + tdc->config_init = false; + tdc->isr_handler = NULL; + spin_unlock_irqrestore(&tdc->lock, flags); + + while (!list_empty(&dma_desc_list)) { + dma_desc = list_first_entry(&dma_desc_list, + typeof(*dma_desc), node); + list_del(&dma_desc->node); + kfree(dma_desc); + } + + while (!list_empty(&sg_req_list)) { + sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node); + list_del(&sg_req->node); + kfree(sg_req); + } + clk_disable_unprepare(tdma->dma_clk); + + tdc->slave_id = 0; +} + +static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct tegra_dma *tdma = ofdma->of_dma_data; + struct dma_chan *chan; + struct tegra_dma_channel *tdc; + + chan = dma_get_any_slave_channel(&tdma->dma_dev); + if (!chan) + return NULL; + + tdc = to_tegra_dma_chan(chan); + tdc->slave_id = dma_spec->args[0]; + + return chan; +} + +/* Tegra20 specific DMA controller information */ +static const struct tegra_dma_chip_data tegra20_dma_chip_data = { + .nr_channels = 16, + .channel_reg_size = 0x20, + .max_dma_count = 1024UL * 64, + .support_channel_pause = false, + .support_separate_wcount_reg = false, +}; + +/* Tegra30 specific DMA controller information */ +static const struct tegra_dma_chip_data tegra30_dma_chip_data = { + .nr_channels = 32, + .channel_reg_size = 0x20, + .max_dma_count = 1024UL * 64, + .support_channel_pause = false, + .support_separate_wcount_reg = false, +}; + +/* Tegra114 specific DMA controller information */ +static const struct tegra_dma_chip_data tegra114_dma_chip_data = { + .nr_channels = 32, + .channel_reg_size = 0x20, + .max_dma_count = 1024UL * 64, + .support_channel_pause = true, + .support_separate_wcount_reg = false, +}; + +/* Tegra148 specific DMA controller information */ +static const struct tegra_dma_chip_data tegra148_dma_chip_data = { + .nr_channels = 32, + .channel_reg_size = 0x40, + .max_dma_count = 1024UL * 64, + .support_channel_pause = true, + .support_separate_wcount_reg = true, +}; + + +static const struct of_device_id tegra_dma_of_match[] = { + { + .compatible = "nvidia,tegra148-apbdma", + .data = &tegra148_dma_chip_data, + }, { + .compatible = "nvidia,tegra114-apbdma", + .data = &tegra114_dma_chip_data, + }, { + .compatible = "nvidia,tegra30-apbdma", + .data = &tegra30_dma_chip_data, + }, { + .compatible = "nvidia,tegra20-apbdma", + .data = &tegra20_dma_chip_data, + }, { + }, +}; +MODULE_DEVICE_TABLE(of, tegra_dma_of_match); + +static int tegra_dma_probe(struct platform_device *pdev) +{ + struct resource *res; + struct tegra_dma *tdma; + int ret; + int i; + const struct tegra_dma_chip_data *cdata = NULL; + const struct of_device_id *match; + + match = of_match_device(tegra_dma_of_match, &pdev->dev); + if (!match) { + dev_err(&pdev->dev, "Error: No device match found\n"); + return -ENODEV; + } + cdata = match->data; + + tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + cdata->nr_channels * + sizeof(struct tegra_dma_channel), GFP_KERNEL); + if (!tdma) { + dev_err(&pdev->dev, "Error: memory allocation failed\n"); + return -ENOMEM; + } + + tdma->dev = &pdev->dev; + tdma->chip_data = cdata; + platform_set_drvdata(pdev, tdma); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tdma->base_addr = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(tdma->base_addr)) + return PTR_ERR(tdma->base_addr); + + tdma->dma_clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(tdma->dma_clk)) { + dev_err(&pdev->dev, "Error: Missing controller clock\n"); + return PTR_ERR(tdma->dma_clk); + } + + tdma->rst = devm_reset_control_get(&pdev->dev, "dma"); + if (IS_ERR(tdma->rst)) { + dev_err(&pdev->dev, "Error: Missing reset\n"); + return PTR_ERR(tdma->rst); + } + + spin_lock_init(&tdma->global_lock); + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = tegra_dma_runtime_resume(&pdev->dev); + if (ret) { + dev_err(&pdev->dev, "dma_runtime_resume failed %d\n", + ret); + goto err_pm_disable; + } + } + + /* Enable clock before accessing registers */ + ret = clk_prepare_enable(tdma->dma_clk); + if (ret < 0) { + dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret); + goto err_pm_disable; + } + + /* Reset DMA controller */ + reset_control_assert(tdma->rst); + udelay(2); + reset_control_deassert(tdma->rst); + + /* Enable global DMA registers */ + tdma_write(tdma, TEGRA_APBDMA_GENERAL, TEGRA_APBDMA_GENERAL_ENABLE); + tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0); + tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul); + + clk_disable_unprepare(tdma->dma_clk); + + INIT_LIST_HEAD(&tdma->dma_dev.channels); + for (i = 0; i < cdata->nr_channels; i++) { + struct tegra_dma_channel *tdc = &tdma->channels[i]; + + tdc->chan_base_offset = TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET + + i * cdata->channel_reg_size; + + res = platform_get_resource(pdev, IORESOURCE_IRQ, i); + if (!res) { + ret = -EINVAL; + dev_err(&pdev->dev, "No irq resource for chan %d\n", i); + goto err_irq; + } + tdc->irq = res->start; + snprintf(tdc->name, sizeof(tdc->name), "apbdma.%d", i); + ret = devm_request_irq(&pdev->dev, tdc->irq, + tegra_dma_isr, 0, tdc->name, tdc); + if (ret) { + dev_err(&pdev->dev, + "request_irq failed with err %d channel %d\n", + ret, i); + goto err_irq; + } + + tdc->dma_chan.device = &tdma->dma_dev; + dma_cookie_init(&tdc->dma_chan); + list_add_tail(&tdc->dma_chan.device_node, + &tdma->dma_dev.channels); + tdc->tdma = tdma; + tdc->id = i; + + tasklet_init(&tdc->tasklet, tegra_dma_tasklet, + (unsigned long)tdc); + spin_lock_init(&tdc->lock); + + INIT_LIST_HEAD(&tdc->pending_sg_req); + INIT_LIST_HEAD(&tdc->free_sg_req); + INIT_LIST_HEAD(&tdc->free_dma_desc); + INIT_LIST_HEAD(&tdc->cb_desc); + } + + dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask); + dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask); + dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask); + + tdma->dma_dev.dev = &pdev->dev; + tdma->dma_dev.device_alloc_chan_resources = + tegra_dma_alloc_chan_resources; + tdma->dma_dev.device_free_chan_resources = + tegra_dma_free_chan_resources; + tdma->dma_dev.device_prep_slave_sg = tegra_dma_prep_slave_sg; + tdma->dma_dev.device_prep_dma_cyclic = tegra_dma_prep_dma_cyclic; + tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); + tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES); + tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + /* + * XXX The hardware appears to support + * DMA_RESIDUE_GRANULARITY_BURST-level reporting, but it's + * only used by this driver during tegra_dma_terminate_all() + */ + tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; + tdma->dma_dev.device_config = tegra_dma_slave_config; + tdma->dma_dev.device_terminate_all = tegra_dma_terminate_all; + tdma->dma_dev.device_tx_status = tegra_dma_tx_status; + tdma->dma_dev.device_issue_pending = tegra_dma_issue_pending; + + ret = dma_async_device_register(&tdma->dma_dev); + if (ret < 0) { + dev_err(&pdev->dev, + "Tegra20 APB DMA driver registration failed %d\n", ret); + goto err_irq; + } + + ret = of_dma_controller_register(pdev->dev.of_node, + tegra_dma_of_xlate, tdma); + if (ret < 0) { + dev_err(&pdev->dev, + "Tegra20 APB DMA OF registration failed %d\n", ret); + goto err_unregister_dma_dev; + } + + dev_info(&pdev->dev, "Tegra20 APB DMA driver register %d channels\n", + cdata->nr_channels); + return 0; + +err_unregister_dma_dev: + dma_async_device_unregister(&tdma->dma_dev); +err_irq: + while (--i >= 0) { + struct tegra_dma_channel *tdc = &tdma->channels[i]; + tasklet_kill(&tdc->tasklet); + } + +err_pm_disable: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_dma_runtime_suspend(&pdev->dev); + return ret; +} + +static int tegra_dma_remove(struct platform_device *pdev) +{ + struct tegra_dma *tdma = platform_get_drvdata(pdev); + int i; + struct tegra_dma_channel *tdc; + + dma_async_device_unregister(&tdma->dma_dev); + + for (i = 0; i < tdma->chip_data->nr_channels; ++i) { + tdc = &tdma->channels[i]; + tasklet_kill(&tdc->tasklet); + } + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_dma_runtime_suspend(&pdev->dev); + + return 0; +} + +static int tegra_dma_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct tegra_dma *tdma = platform_get_drvdata(pdev); + + clk_disable_unprepare(tdma->dma_clk); + return 0; +} + +static int tegra_dma_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct tegra_dma *tdma = platform_get_drvdata(pdev); + int ret; + + ret = clk_prepare_enable(tdma->dma_clk); + if (ret < 0) { + dev_err(dev, "clk_enable failed: %d\n", ret); + return ret; + } + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tegra_dma_pm_suspend(struct device *dev) +{ + struct tegra_dma *tdma = dev_get_drvdata(dev); + int i; + int ret; + + /* Enable clock before accessing register */ + ret = tegra_dma_runtime_resume(dev); + if (ret < 0) + return ret; + + tdma->reg_gen = tdma_read(tdma, TEGRA_APBDMA_GENERAL); + for (i = 0; i < tdma->chip_data->nr_channels; i++) { + struct tegra_dma_channel *tdc = &tdma->channels[i]; + struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg; + + ch_reg->csr = tdc_read(tdc, TEGRA_APBDMA_CHAN_CSR); + ch_reg->ahb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBPTR); + ch_reg->apb_ptr = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBPTR); + ch_reg->ahb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_AHBSEQ); + ch_reg->apb_seq = tdc_read(tdc, TEGRA_APBDMA_CHAN_APBSEQ); + } + + /* Disable clock */ + tegra_dma_runtime_suspend(dev); + return 0; +} + +static int tegra_dma_pm_resume(struct device *dev) +{ + struct tegra_dma *tdma = dev_get_drvdata(dev); + int i; + int ret; + + /* Enable clock before accessing register */ + ret = tegra_dma_runtime_resume(dev); + if (ret < 0) + return ret; + + tdma_write(tdma, TEGRA_APBDMA_GENERAL, tdma->reg_gen); + tdma_write(tdma, TEGRA_APBDMA_CONTROL, 0); + tdma_write(tdma, TEGRA_APBDMA_IRQ_MASK_SET, 0xFFFFFFFFul); + + for (i = 0; i < tdma->chip_data->nr_channels; i++) { + struct tegra_dma_channel *tdc = &tdma->channels[i]; + struct tegra_dma_channel_regs *ch_reg = &tdc->channel_reg; + + tdc_write(tdc, TEGRA_APBDMA_CHAN_APBSEQ, ch_reg->apb_seq); + tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_reg->apb_ptr); + tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_reg->ahb_seq); + tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_reg->ahb_ptr); + tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR, + (ch_reg->csr & ~TEGRA_APBDMA_CSR_ENB)); + } + + /* Disable clock */ + tegra_dma_runtime_suspend(dev); + return 0; +} +#endif + +static const struct dev_pm_ops tegra_dma_dev_pm_ops = { +#ifdef CONFIG_PM + .runtime_suspend = tegra_dma_runtime_suspend, + .runtime_resume = tegra_dma_runtime_resume, +#endif + SET_SYSTEM_SLEEP_PM_OPS(tegra_dma_pm_suspend, tegra_dma_pm_resume) +}; + +static struct platform_driver tegra_dmac_driver = { + .driver = { + .name = "tegra-apbdma", + .pm = &tegra_dma_dev_pm_ops, + .of_match_table = tegra_dma_of_match, + }, + .probe = tegra_dma_probe, + .remove = tegra_dma_remove, +}; + +module_platform_driver(tegra_dmac_driver); + +MODULE_ALIAS("platform:tegra20-apbdma"); +MODULE_DESCRIPTION("NVIDIA Tegra APB DMA Controller driver"); +MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c new file mode 100644 index 000000000..c4c3d93fd --- /dev/null +++ b/drivers/dma/timb_dma.c @@ -0,0 +1,792 @@ +/* + * timb_dma.c timberdale FPGA DMA driver + * Copyright (c) 2010 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* Supports: + * Timberdale FPGA DMA engine + */ + +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include <linux/timb_dma.h> + +#include "dmaengine.h" + +#define DRIVER_NAME "timb-dma" + +/* Global DMA registers */ +#define TIMBDMA_ACR 0x34 +#define TIMBDMA_32BIT_ADDR 0x01 + +#define TIMBDMA_ISR 0x080000 +#define TIMBDMA_IPR 0x080004 +#define TIMBDMA_IER 0x080008 + +/* Channel specific registers */ +/* RX instances base addresses are 0x00, 0x40, 0x80 ... + * TX instances base addresses are 0x18, 0x58, 0x98 ... + */ +#define TIMBDMA_INSTANCE_OFFSET 0x40 +#define TIMBDMA_INSTANCE_TX_OFFSET 0x18 + +/* RX registers, relative the instance base */ +#define TIMBDMA_OFFS_RX_DHAR 0x00 +#define TIMBDMA_OFFS_RX_DLAR 0x04 +#define TIMBDMA_OFFS_RX_LR 0x0C +#define TIMBDMA_OFFS_RX_BLR 0x10 +#define TIMBDMA_OFFS_RX_ER 0x14 +#define TIMBDMA_RX_EN 0x01 +/* bytes per Row, video specific register + * which is placed after the TX registers... + */ +#define TIMBDMA_OFFS_RX_BPRR 0x30 + +/* TX registers, relative the instance base */ +#define TIMBDMA_OFFS_TX_DHAR 0x00 +#define TIMBDMA_OFFS_TX_DLAR 0x04 +#define TIMBDMA_OFFS_TX_BLR 0x0C +#define TIMBDMA_OFFS_TX_LR 0x14 + + +#define TIMB_DMA_DESC_SIZE 8 + +struct timb_dma_desc { + struct list_head desc_node; + struct dma_async_tx_descriptor txd; + u8 *desc_list; + unsigned int desc_list_len; + bool interrupt; +}; + +struct timb_dma_chan { + struct dma_chan chan; + void __iomem *membase; + spinlock_t lock; /* Used to protect data structures, + especially the lists and descriptors, + from races between the tasklet and calls + from above */ + bool ongoing; + struct list_head active_list; + struct list_head queue; + struct list_head free_list; + unsigned int bytes_per_line; + enum dma_transfer_direction direction; + unsigned int descs; /* Descriptors to allocate */ + unsigned int desc_elems; /* number of elems per descriptor */ +}; + +struct timb_dma { + struct dma_device dma; + void __iomem *membase; + struct tasklet_struct tasklet; + struct timb_dma_chan channels[0]; +}; + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} +static struct device *chan2dmadev(struct dma_chan *chan) +{ + return chan2dev(chan)->parent->parent; +} + +static struct timb_dma *tdchantotd(struct timb_dma_chan *td_chan) +{ + int id = td_chan->chan.chan_id; + return (struct timb_dma *)((u8 *)td_chan - + id * sizeof(struct timb_dma_chan) - sizeof(struct timb_dma)); +} + +/* Must be called with the spinlock held */ +static void __td_enable_chan_irq(struct timb_dma_chan *td_chan) +{ + int id = td_chan->chan.chan_id; + struct timb_dma *td = tdchantotd(td_chan); + u32 ier; + + /* enable interrupt for this channel */ + ier = ioread32(td->membase + TIMBDMA_IER); + ier |= 1 << id; + dev_dbg(chan2dev(&td_chan->chan), "Enabling irq: %d, IER: 0x%x\n", id, + ier); + iowrite32(ier, td->membase + TIMBDMA_IER); +} + +/* Should be called with the spinlock held */ +static bool __td_dma_done_ack(struct timb_dma_chan *td_chan) +{ + int id = td_chan->chan.chan_id; + struct timb_dma *td = (struct timb_dma *)((u8 *)td_chan - + id * sizeof(struct timb_dma_chan) - sizeof(struct timb_dma)); + u32 isr; + bool done = false; + + dev_dbg(chan2dev(&td_chan->chan), "Checking irq: %d, td: %p\n", id, td); + + isr = ioread32(td->membase + TIMBDMA_ISR) & (1 << id); + if (isr) { + iowrite32(isr, td->membase + TIMBDMA_ISR); + done = true; + } + + return done; +} + +static int td_fill_desc(struct timb_dma_chan *td_chan, u8 *dma_desc, + struct scatterlist *sg, bool last) +{ + if (sg_dma_len(sg) > USHRT_MAX) { + dev_err(chan2dev(&td_chan->chan), "Too big sg element\n"); + return -EINVAL; + } + + /* length must be word aligned */ + if (sg_dma_len(sg) % sizeof(u32)) { + dev_err(chan2dev(&td_chan->chan), "Incorrect length: %d\n", + sg_dma_len(sg)); + return -EINVAL; + } + + dev_dbg(chan2dev(&td_chan->chan), "desc: %p, addr: 0x%llx\n", + dma_desc, (unsigned long long)sg_dma_address(sg)); + + dma_desc[7] = (sg_dma_address(sg) >> 24) & 0xff; + dma_desc[6] = (sg_dma_address(sg) >> 16) & 0xff; + dma_desc[5] = (sg_dma_address(sg) >> 8) & 0xff; + dma_desc[4] = (sg_dma_address(sg) >> 0) & 0xff; + + dma_desc[3] = (sg_dma_len(sg) >> 8) & 0xff; + dma_desc[2] = (sg_dma_len(sg) >> 0) & 0xff; + + dma_desc[1] = 0x00; + dma_desc[0] = 0x21 | (last ? 0x02 : 0); /* tran, valid */ + + return 0; +} + +/* Must be called with the spinlock held */ +static void __td_start_dma(struct timb_dma_chan *td_chan) +{ + struct timb_dma_desc *td_desc; + + if (td_chan->ongoing) { + dev_err(chan2dev(&td_chan->chan), + "Transfer already ongoing\n"); + return; + } + + td_desc = list_entry(td_chan->active_list.next, struct timb_dma_desc, + desc_node); + + dev_dbg(chan2dev(&td_chan->chan), + "td_chan: %p, chan: %d, membase: %p\n", + td_chan, td_chan->chan.chan_id, td_chan->membase); + + if (td_chan->direction == DMA_DEV_TO_MEM) { + + /* descriptor address */ + iowrite32(0, td_chan->membase + TIMBDMA_OFFS_RX_DHAR); + iowrite32(td_desc->txd.phys, td_chan->membase + + TIMBDMA_OFFS_RX_DLAR); + /* Bytes per line */ + iowrite32(td_chan->bytes_per_line, td_chan->membase + + TIMBDMA_OFFS_RX_BPRR); + /* enable RX */ + iowrite32(TIMBDMA_RX_EN, td_chan->membase + TIMBDMA_OFFS_RX_ER); + } else { + /* address high */ + iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DHAR); + iowrite32(td_desc->txd.phys, td_chan->membase + + TIMBDMA_OFFS_TX_DLAR); + } + + td_chan->ongoing = true; + + if (td_desc->interrupt) + __td_enable_chan_irq(td_chan); +} + +static void __td_finish(struct timb_dma_chan *td_chan) +{ + dma_async_tx_callback callback; + void *param; + struct dma_async_tx_descriptor *txd; + struct timb_dma_desc *td_desc; + + /* can happen if the descriptor is canceled */ + if (list_empty(&td_chan->active_list)) + return; + + td_desc = list_entry(td_chan->active_list.next, struct timb_dma_desc, + desc_node); + txd = &td_desc->txd; + + dev_dbg(chan2dev(&td_chan->chan), "descriptor %u complete\n", + txd->cookie); + + /* make sure to stop the transfer */ + if (td_chan->direction == DMA_DEV_TO_MEM) + iowrite32(0, td_chan->membase + TIMBDMA_OFFS_RX_ER); +/* Currently no support for stopping DMA transfers + else + iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DLAR); +*/ + dma_cookie_complete(txd); + td_chan->ongoing = false; + + callback = txd->callback; + param = txd->callback_param; + + list_move(&td_desc->desc_node, &td_chan->free_list); + + dma_descriptor_unmap(txd); + /* + * The API requires that no submissions are done from a + * callback, so we don't need to drop the lock here + */ + if (callback) + callback(param); +} + +static u32 __td_ier_mask(struct timb_dma *td) +{ + int i; + u32 ret = 0; + + for (i = 0; i < td->dma.chancnt; i++) { + struct timb_dma_chan *td_chan = td->channels + i; + if (td_chan->ongoing) { + struct timb_dma_desc *td_desc = + list_entry(td_chan->active_list.next, + struct timb_dma_desc, desc_node); + if (td_desc->interrupt) + ret |= 1 << i; + } + } + + return ret; +} + +static void __td_start_next(struct timb_dma_chan *td_chan) +{ + struct timb_dma_desc *td_desc; + + BUG_ON(list_empty(&td_chan->queue)); + BUG_ON(td_chan->ongoing); + + td_desc = list_entry(td_chan->queue.next, struct timb_dma_desc, + desc_node); + + dev_dbg(chan2dev(&td_chan->chan), "%s: started %u\n", + __func__, td_desc->txd.cookie); + + list_move(&td_desc->desc_node, &td_chan->active_list); + __td_start_dma(td_chan); +} + +static dma_cookie_t td_tx_submit(struct dma_async_tx_descriptor *txd) +{ + struct timb_dma_desc *td_desc = container_of(txd, struct timb_dma_desc, + txd); + struct timb_dma_chan *td_chan = container_of(txd->chan, + struct timb_dma_chan, chan); + dma_cookie_t cookie; + + spin_lock_bh(&td_chan->lock); + cookie = dma_cookie_assign(txd); + + if (list_empty(&td_chan->active_list)) { + dev_dbg(chan2dev(txd->chan), "%s: started %u\n", __func__, + txd->cookie); + list_add_tail(&td_desc->desc_node, &td_chan->active_list); + __td_start_dma(td_chan); + } else { + dev_dbg(chan2dev(txd->chan), "tx_submit: queued %u\n", + txd->cookie); + + list_add_tail(&td_desc->desc_node, &td_chan->queue); + } + + spin_unlock_bh(&td_chan->lock); + + return cookie; +} + +static struct timb_dma_desc *td_alloc_init_desc(struct timb_dma_chan *td_chan) +{ + struct dma_chan *chan = &td_chan->chan; + struct timb_dma_desc *td_desc; + int err; + + td_desc = kzalloc(sizeof(struct timb_dma_desc), GFP_KERNEL); + if (!td_desc) { + dev_err(chan2dev(chan), "Failed to alloc descriptor\n"); + goto out; + } + + td_desc->desc_list_len = td_chan->desc_elems * TIMB_DMA_DESC_SIZE; + + td_desc->desc_list = kzalloc(td_desc->desc_list_len, GFP_KERNEL); + if (!td_desc->desc_list) { + dev_err(chan2dev(chan), "Failed to alloc descriptor\n"); + goto err; + } + + dma_async_tx_descriptor_init(&td_desc->txd, chan); + td_desc->txd.tx_submit = td_tx_submit; + td_desc->txd.flags = DMA_CTRL_ACK; + + td_desc->txd.phys = dma_map_single(chan2dmadev(chan), + td_desc->desc_list, td_desc->desc_list_len, DMA_TO_DEVICE); + + err = dma_mapping_error(chan2dmadev(chan), td_desc->txd.phys); + if (err) { + dev_err(chan2dev(chan), "DMA mapping error: %d\n", err); + goto err; + } + + return td_desc; +err: + kfree(td_desc->desc_list); + kfree(td_desc); +out: + return NULL; + +} + +static void td_free_desc(struct timb_dma_desc *td_desc) +{ + dev_dbg(chan2dev(td_desc->txd.chan), "Freeing desc: %p\n", td_desc); + dma_unmap_single(chan2dmadev(td_desc->txd.chan), td_desc->txd.phys, + td_desc->desc_list_len, DMA_TO_DEVICE); + + kfree(td_desc->desc_list); + kfree(td_desc); +} + +static void td_desc_put(struct timb_dma_chan *td_chan, + struct timb_dma_desc *td_desc) +{ + dev_dbg(chan2dev(&td_chan->chan), "Putting desc: %p\n", td_desc); + + spin_lock_bh(&td_chan->lock); + list_add(&td_desc->desc_node, &td_chan->free_list); + spin_unlock_bh(&td_chan->lock); +} + +static struct timb_dma_desc *td_desc_get(struct timb_dma_chan *td_chan) +{ + struct timb_dma_desc *td_desc, *_td_desc; + struct timb_dma_desc *ret = NULL; + + spin_lock_bh(&td_chan->lock); + list_for_each_entry_safe(td_desc, _td_desc, &td_chan->free_list, + desc_node) { + if (async_tx_test_ack(&td_desc->txd)) { + list_del(&td_desc->desc_node); + ret = td_desc; + break; + } + dev_dbg(chan2dev(&td_chan->chan), "desc %p not ACKed\n", + td_desc); + } + spin_unlock_bh(&td_chan->lock); + + return ret; +} + +static int td_alloc_chan_resources(struct dma_chan *chan) +{ + struct timb_dma_chan *td_chan = + container_of(chan, struct timb_dma_chan, chan); + int i; + + dev_dbg(chan2dev(chan), "%s: entry\n", __func__); + + BUG_ON(!list_empty(&td_chan->free_list)); + for (i = 0; i < td_chan->descs; i++) { + struct timb_dma_desc *td_desc = td_alloc_init_desc(td_chan); + if (!td_desc) { + if (i) + break; + else { + dev_err(chan2dev(chan), + "Couldnt allocate any descriptors\n"); + return -ENOMEM; + } + } + + td_desc_put(td_chan, td_desc); + } + + spin_lock_bh(&td_chan->lock); + dma_cookie_init(chan); + spin_unlock_bh(&td_chan->lock); + + return 0; +} + +static void td_free_chan_resources(struct dma_chan *chan) +{ + struct timb_dma_chan *td_chan = + container_of(chan, struct timb_dma_chan, chan); + struct timb_dma_desc *td_desc, *_td_desc; + LIST_HEAD(list); + + dev_dbg(chan2dev(chan), "%s: Entry\n", __func__); + + /* check that all descriptors are free */ + BUG_ON(!list_empty(&td_chan->active_list)); + BUG_ON(!list_empty(&td_chan->queue)); + + spin_lock_bh(&td_chan->lock); + list_splice_init(&td_chan->free_list, &list); + spin_unlock_bh(&td_chan->lock); + + list_for_each_entry_safe(td_desc, _td_desc, &list, desc_node) { + dev_dbg(chan2dev(chan), "%s: Freeing desc: %p\n", __func__, + td_desc); + td_free_desc(td_desc); + } +} + +static enum dma_status td_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + enum dma_status ret; + + dev_dbg(chan2dev(chan), "%s: Entry\n", __func__); + + ret = dma_cookie_status(chan, cookie, txstate); + + dev_dbg(chan2dev(chan), "%s: exit, ret: %d\n", __func__, ret); + + return ret; +} + +static void td_issue_pending(struct dma_chan *chan) +{ + struct timb_dma_chan *td_chan = + container_of(chan, struct timb_dma_chan, chan); + + dev_dbg(chan2dev(chan), "%s: Entry\n", __func__); + spin_lock_bh(&td_chan->lock); + + if (!list_empty(&td_chan->active_list)) + /* transfer ongoing */ + if (__td_dma_done_ack(td_chan)) + __td_finish(td_chan); + + if (list_empty(&td_chan->active_list) && !list_empty(&td_chan->queue)) + __td_start_next(td_chan); + + spin_unlock_bh(&td_chan->lock); +} + +static struct dma_async_tx_descriptor *td_prep_slave_sg(struct dma_chan *chan, + struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, + void *context) +{ + struct timb_dma_chan *td_chan = + container_of(chan, struct timb_dma_chan, chan); + struct timb_dma_desc *td_desc; + struct scatterlist *sg; + unsigned int i; + unsigned int desc_usage = 0; + + if (!sgl || !sg_len) { + dev_err(chan2dev(chan), "%s: No SG list\n", __func__); + return NULL; + } + + /* even channels are for RX, odd for TX */ + if (td_chan->direction != direction) { + dev_err(chan2dev(chan), + "Requesting channel in wrong direction\n"); + return NULL; + } + + td_desc = td_desc_get(td_chan); + if (!td_desc) { + dev_err(chan2dev(chan), "Not enough descriptors available\n"); + return NULL; + } + + td_desc->interrupt = (flags & DMA_PREP_INTERRUPT) != 0; + + for_each_sg(sgl, sg, sg_len, i) { + int err; + if (desc_usage > td_desc->desc_list_len) { + dev_err(chan2dev(chan), "No descriptor space\n"); + return NULL; + } + + err = td_fill_desc(td_chan, td_desc->desc_list + desc_usage, sg, + i == (sg_len - 1)); + if (err) { + dev_err(chan2dev(chan), "Failed to update desc: %d\n", + err); + td_desc_put(td_chan, td_desc); + return NULL; + } + desc_usage += TIMB_DMA_DESC_SIZE; + } + + dma_sync_single_for_device(chan2dmadev(chan), td_desc->txd.phys, + td_desc->desc_list_len, DMA_MEM_TO_DEV); + + return &td_desc->txd; +} + +static int td_terminate_all(struct dma_chan *chan) +{ + struct timb_dma_chan *td_chan = + container_of(chan, struct timb_dma_chan, chan); + struct timb_dma_desc *td_desc, *_td_desc; + + dev_dbg(chan2dev(chan), "%s: Entry\n", __func__); + + /* first the easy part, put the queue into the free list */ + spin_lock_bh(&td_chan->lock); + list_for_each_entry_safe(td_desc, _td_desc, &td_chan->queue, + desc_node) + list_move(&td_desc->desc_node, &td_chan->free_list); + + /* now tear down the running */ + __td_finish(td_chan); + spin_unlock_bh(&td_chan->lock); + + return 0; +} + +static void td_tasklet(unsigned long data) +{ + struct timb_dma *td = (struct timb_dma *)data; + u32 isr; + u32 ipr; + u32 ier; + int i; + + isr = ioread32(td->membase + TIMBDMA_ISR); + ipr = isr & __td_ier_mask(td); + + /* ack the interrupts */ + iowrite32(ipr, td->membase + TIMBDMA_ISR); + + for (i = 0; i < td->dma.chancnt; i++) + if (ipr & (1 << i)) { + struct timb_dma_chan *td_chan = td->channels + i; + spin_lock(&td_chan->lock); + __td_finish(td_chan); + if (!list_empty(&td_chan->queue)) + __td_start_next(td_chan); + spin_unlock(&td_chan->lock); + } + + ier = __td_ier_mask(td); + iowrite32(ier, td->membase + TIMBDMA_IER); +} + + +static irqreturn_t td_irq(int irq, void *devid) +{ + struct timb_dma *td = devid; + u32 ipr = ioread32(td->membase + TIMBDMA_IPR); + + if (ipr) { + /* disable interrupts, will be re-enabled in tasklet */ + iowrite32(0, td->membase + TIMBDMA_IER); + + tasklet_schedule(&td->tasklet); + + return IRQ_HANDLED; + } else + return IRQ_NONE; +} + + +static int td_probe(struct platform_device *pdev) +{ + struct timb_dma_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct timb_dma *td; + struct resource *iomem; + int irq; + int err; + int i; + + if (!pdata) { + dev_err(&pdev->dev, "No platform data\n"); + return -EINVAL; + } + + iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!iomem) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + if (!request_mem_region(iomem->start, resource_size(iomem), + DRIVER_NAME)) + return -EBUSY; + + td = kzalloc(sizeof(struct timb_dma) + + sizeof(struct timb_dma_chan) * pdata->nr_channels, GFP_KERNEL); + if (!td) { + err = -ENOMEM; + goto err_release_region; + } + + dev_dbg(&pdev->dev, "Allocated TD: %p\n", td); + + td->membase = ioremap(iomem->start, resource_size(iomem)); + if (!td->membase) { + dev_err(&pdev->dev, "Failed to remap I/O memory\n"); + err = -ENOMEM; + goto err_free_mem; + } + + /* 32bit addressing */ + iowrite32(TIMBDMA_32BIT_ADDR, td->membase + TIMBDMA_ACR); + + /* disable and clear any interrupts */ + iowrite32(0x0, td->membase + TIMBDMA_IER); + iowrite32(0xFFFFFFFF, td->membase + TIMBDMA_ISR); + + tasklet_init(&td->tasklet, td_tasklet, (unsigned long)td); + + err = request_irq(irq, td_irq, IRQF_SHARED, DRIVER_NAME, td); + if (err) { + dev_err(&pdev->dev, "Failed to request IRQ\n"); + goto err_tasklet_kill; + } + + td->dma.device_alloc_chan_resources = td_alloc_chan_resources; + td->dma.device_free_chan_resources = td_free_chan_resources; + td->dma.device_tx_status = td_tx_status; + td->dma.device_issue_pending = td_issue_pending; + + dma_cap_set(DMA_SLAVE, td->dma.cap_mask); + dma_cap_set(DMA_PRIVATE, td->dma.cap_mask); + td->dma.device_prep_slave_sg = td_prep_slave_sg; + td->dma.device_terminate_all = td_terminate_all; + + td->dma.dev = &pdev->dev; + + INIT_LIST_HEAD(&td->dma.channels); + + for (i = 0; i < pdata->nr_channels; i++) { + struct timb_dma_chan *td_chan = &td->channels[i]; + struct timb_dma_platform_data_channel *pchan = + pdata->channels + i; + + /* even channels are RX, odd are TX */ + if ((i % 2) == pchan->rx) { + dev_err(&pdev->dev, "Wrong channel configuration\n"); + err = -EINVAL; + goto err_free_irq; + } + + td_chan->chan.device = &td->dma; + dma_cookie_init(&td_chan->chan); + spin_lock_init(&td_chan->lock); + INIT_LIST_HEAD(&td_chan->active_list); + INIT_LIST_HEAD(&td_chan->queue); + INIT_LIST_HEAD(&td_chan->free_list); + + td_chan->descs = pchan->descriptors; + td_chan->desc_elems = pchan->descriptor_elements; + td_chan->bytes_per_line = pchan->bytes_per_line; + td_chan->direction = pchan->rx ? DMA_DEV_TO_MEM : + DMA_MEM_TO_DEV; + + td_chan->membase = td->membase + + (i / 2) * TIMBDMA_INSTANCE_OFFSET + + (pchan->rx ? 0 : TIMBDMA_INSTANCE_TX_OFFSET); + + dev_dbg(&pdev->dev, "Chan: %d, membase: %p\n", + i, td_chan->membase); + + list_add_tail(&td_chan->chan.device_node, &td->dma.channels); + } + + err = dma_async_device_register(&td->dma); + if (err) { + dev_err(&pdev->dev, "Failed to register async device\n"); + goto err_free_irq; + } + + platform_set_drvdata(pdev, td); + + dev_dbg(&pdev->dev, "Probe result: %d\n", err); + return err; + +err_free_irq: + free_irq(irq, td); +err_tasklet_kill: + tasklet_kill(&td->tasklet); + iounmap(td->membase); +err_free_mem: + kfree(td); +err_release_region: + release_mem_region(iomem->start, resource_size(iomem)); + + return err; + +} + +static int td_remove(struct platform_device *pdev) +{ + struct timb_dma *td = platform_get_drvdata(pdev); + struct resource *iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + int irq = platform_get_irq(pdev, 0); + + dma_async_device_unregister(&td->dma); + free_irq(irq, td); + tasklet_kill(&td->tasklet); + iounmap(td->membase); + kfree(td); + release_mem_region(iomem->start, resource_size(iomem)); + + dev_dbg(&pdev->dev, "Removed...\n"); + return 0; +} + +static struct platform_driver td_driver = { + .driver = { + .name = DRIVER_NAME, + }, + .probe = td_probe, + .remove = td_remove, +}; + +module_platform_driver(td_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Timberdale DMA controller driver"); +MODULE_AUTHOR("Pelagicore AB <info@pelagicore.com>"); +MODULE_ALIAS("platform:"DRIVER_NAME); diff --git a/drivers/dma/txx9dmac.c b/drivers/dma/txx9dmac.c new file mode 100644 index 000000000..8849318b3 --- /dev/null +++ b/drivers/dma/txx9dmac.c @@ -0,0 +1,1314 @@ +/* + * Driver for the TXx9 SoC DMA Controller + * + * Copyright (C) 2009 Atsushi Nemoto + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/scatterlist.h> + +#include "dmaengine.h" +#include "txx9dmac.h" + +static struct txx9dmac_chan *to_txx9dmac_chan(struct dma_chan *chan) +{ + return container_of(chan, struct txx9dmac_chan, chan); +} + +static struct txx9dmac_cregs __iomem *__dma_regs(const struct txx9dmac_chan *dc) +{ + return dc->ch_regs; +} + +static struct txx9dmac_cregs32 __iomem *__dma_regs32( + const struct txx9dmac_chan *dc) +{ + return dc->ch_regs; +} + +#define channel64_readq(dc, name) \ + __raw_readq(&(__dma_regs(dc)->name)) +#define channel64_writeq(dc, name, val) \ + __raw_writeq((val), &(__dma_regs(dc)->name)) +#define channel64_readl(dc, name) \ + __raw_readl(&(__dma_regs(dc)->name)) +#define channel64_writel(dc, name, val) \ + __raw_writel((val), &(__dma_regs(dc)->name)) + +#define channel32_readl(dc, name) \ + __raw_readl(&(__dma_regs32(dc)->name)) +#define channel32_writel(dc, name, val) \ + __raw_writel((val), &(__dma_regs32(dc)->name)) + +#define channel_readq(dc, name) channel64_readq(dc, name) +#define channel_writeq(dc, name, val) channel64_writeq(dc, name, val) +#define channel_readl(dc, name) \ + (is_dmac64(dc) ? \ + channel64_readl(dc, name) : channel32_readl(dc, name)) +#define channel_writel(dc, name, val) \ + (is_dmac64(dc) ? \ + channel64_writel(dc, name, val) : channel32_writel(dc, name, val)) + +static dma_addr_t channel64_read_CHAR(const struct txx9dmac_chan *dc) +{ + if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64)) + return channel64_readq(dc, CHAR); + else + return channel64_readl(dc, CHAR); +} + +static void channel64_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val) +{ + if (sizeof(__dma_regs(dc)->CHAR) == sizeof(u64)) + channel64_writeq(dc, CHAR, val); + else + channel64_writel(dc, CHAR, val); +} + +static void channel64_clear_CHAR(const struct txx9dmac_chan *dc) +{ +#if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) + channel64_writel(dc, CHAR, 0); + channel64_writel(dc, __pad_CHAR, 0); +#else + channel64_writeq(dc, CHAR, 0); +#endif +} + +static dma_addr_t channel_read_CHAR(const struct txx9dmac_chan *dc) +{ + if (is_dmac64(dc)) + return channel64_read_CHAR(dc); + else + return channel32_readl(dc, CHAR); +} + +static void channel_write_CHAR(const struct txx9dmac_chan *dc, dma_addr_t val) +{ + if (is_dmac64(dc)) + channel64_write_CHAR(dc, val); + else + channel32_writel(dc, CHAR, val); +} + +static struct txx9dmac_regs __iomem *__txx9dmac_regs( + const struct txx9dmac_dev *ddev) +{ + return ddev->regs; +} + +static struct txx9dmac_regs32 __iomem *__txx9dmac_regs32( + const struct txx9dmac_dev *ddev) +{ + return ddev->regs; +} + +#define dma64_readl(ddev, name) \ + __raw_readl(&(__txx9dmac_regs(ddev)->name)) +#define dma64_writel(ddev, name, val) \ + __raw_writel((val), &(__txx9dmac_regs(ddev)->name)) + +#define dma32_readl(ddev, name) \ + __raw_readl(&(__txx9dmac_regs32(ddev)->name)) +#define dma32_writel(ddev, name, val) \ + __raw_writel((val), &(__txx9dmac_regs32(ddev)->name)) + +#define dma_readl(ddev, name) \ + (__is_dmac64(ddev) ? \ + dma64_readl(ddev, name) : dma32_readl(ddev, name)) +#define dma_writel(ddev, name, val) \ + (__is_dmac64(ddev) ? \ + dma64_writel(ddev, name, val) : dma32_writel(ddev, name, val)) + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} +static struct device *chan2parent(struct dma_chan *chan) +{ + return chan->dev->device.parent; +} + +static struct txx9dmac_desc * +txd_to_txx9dmac_desc(struct dma_async_tx_descriptor *txd) +{ + return container_of(txd, struct txx9dmac_desc, txd); +} + +static dma_addr_t desc_read_CHAR(const struct txx9dmac_chan *dc, + const struct txx9dmac_desc *desc) +{ + return is_dmac64(dc) ? desc->hwdesc.CHAR : desc->hwdesc32.CHAR; +} + +static void desc_write_CHAR(const struct txx9dmac_chan *dc, + struct txx9dmac_desc *desc, dma_addr_t val) +{ + if (is_dmac64(dc)) + desc->hwdesc.CHAR = val; + else + desc->hwdesc32.CHAR = val; +} + +#define TXX9_DMA_MAX_COUNT 0x04000000 + +#define TXX9_DMA_INITIAL_DESC_COUNT 64 + +static struct txx9dmac_desc *txx9dmac_first_active(struct txx9dmac_chan *dc) +{ + return list_entry(dc->active_list.next, + struct txx9dmac_desc, desc_node); +} + +static struct txx9dmac_desc *txx9dmac_last_active(struct txx9dmac_chan *dc) +{ + return list_entry(dc->active_list.prev, + struct txx9dmac_desc, desc_node); +} + +static struct txx9dmac_desc *txx9dmac_first_queued(struct txx9dmac_chan *dc) +{ + return list_entry(dc->queue.next, struct txx9dmac_desc, desc_node); +} + +static struct txx9dmac_desc *txx9dmac_last_child(struct txx9dmac_desc *desc) +{ + if (!list_empty(&desc->tx_list)) + desc = list_entry(desc->tx_list.prev, typeof(*desc), desc_node); + return desc; +} + +static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx); + +static struct txx9dmac_desc *txx9dmac_desc_alloc(struct txx9dmac_chan *dc, + gfp_t flags) +{ + struct txx9dmac_dev *ddev = dc->ddev; + struct txx9dmac_desc *desc; + + desc = kzalloc(sizeof(*desc), flags); + if (!desc) + return NULL; + INIT_LIST_HEAD(&desc->tx_list); + dma_async_tx_descriptor_init(&desc->txd, &dc->chan); + desc->txd.tx_submit = txx9dmac_tx_submit; + /* txd.flags will be overwritten in prep funcs */ + desc->txd.flags = DMA_CTRL_ACK; + desc->txd.phys = dma_map_single(chan2parent(&dc->chan), &desc->hwdesc, + ddev->descsize, DMA_TO_DEVICE); + return desc; +} + +static struct txx9dmac_desc *txx9dmac_desc_get(struct txx9dmac_chan *dc) +{ + struct txx9dmac_desc *desc, *_desc; + struct txx9dmac_desc *ret = NULL; + unsigned int i = 0; + + spin_lock_bh(&dc->lock); + list_for_each_entry_safe(desc, _desc, &dc->free_list, desc_node) { + if (async_tx_test_ack(&desc->txd)) { + list_del(&desc->desc_node); + ret = desc; + break; + } + dev_dbg(chan2dev(&dc->chan), "desc %p not ACKed\n", desc); + i++; + } + spin_unlock_bh(&dc->lock); + + dev_vdbg(chan2dev(&dc->chan), "scanned %u descriptors on freelist\n", + i); + if (!ret) { + ret = txx9dmac_desc_alloc(dc, GFP_ATOMIC); + if (ret) { + spin_lock_bh(&dc->lock); + dc->descs_allocated++; + spin_unlock_bh(&dc->lock); + } else + dev_err(chan2dev(&dc->chan), + "not enough descriptors available\n"); + } + return ret; +} + +static void txx9dmac_sync_desc_for_cpu(struct txx9dmac_chan *dc, + struct txx9dmac_desc *desc) +{ + struct txx9dmac_dev *ddev = dc->ddev; + struct txx9dmac_desc *child; + + list_for_each_entry(child, &desc->tx_list, desc_node) + dma_sync_single_for_cpu(chan2parent(&dc->chan), + child->txd.phys, ddev->descsize, + DMA_TO_DEVICE); + dma_sync_single_for_cpu(chan2parent(&dc->chan), + desc->txd.phys, ddev->descsize, + DMA_TO_DEVICE); +} + +/* + * Move a descriptor, including any children, to the free list. + * `desc' must not be on any lists. + */ +static void txx9dmac_desc_put(struct txx9dmac_chan *dc, + struct txx9dmac_desc *desc) +{ + if (desc) { + struct txx9dmac_desc *child; + + txx9dmac_sync_desc_for_cpu(dc, desc); + + spin_lock_bh(&dc->lock); + list_for_each_entry(child, &desc->tx_list, desc_node) + dev_vdbg(chan2dev(&dc->chan), + "moving child desc %p to freelist\n", + child); + list_splice_init(&desc->tx_list, &dc->free_list); + dev_vdbg(chan2dev(&dc->chan), "moving desc %p to freelist\n", + desc); + list_add(&desc->desc_node, &dc->free_list); + spin_unlock_bh(&dc->lock); + } +} + +/*----------------------------------------------------------------------*/ + +static void txx9dmac_dump_regs(struct txx9dmac_chan *dc) +{ + if (is_dmac64(dc)) + dev_err(chan2dev(&dc->chan), + " CHAR: %#llx SAR: %#llx DAR: %#llx CNTR: %#x" + " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n", + (u64)channel64_read_CHAR(dc), + channel64_readq(dc, SAR), + channel64_readq(dc, DAR), + channel64_readl(dc, CNTR), + channel64_readl(dc, SAIR), + channel64_readl(dc, DAIR), + channel64_readl(dc, CCR), + channel64_readl(dc, CSR)); + else + dev_err(chan2dev(&dc->chan), + " CHAR: %#x SAR: %#x DAR: %#x CNTR: %#x" + " SAIR: %#x DAIR: %#x CCR: %#x CSR: %#x\n", + channel32_readl(dc, CHAR), + channel32_readl(dc, SAR), + channel32_readl(dc, DAR), + channel32_readl(dc, CNTR), + channel32_readl(dc, SAIR), + channel32_readl(dc, DAIR), + channel32_readl(dc, CCR), + channel32_readl(dc, CSR)); +} + +static void txx9dmac_reset_chan(struct txx9dmac_chan *dc) +{ + channel_writel(dc, CCR, TXX9_DMA_CCR_CHRST); + if (is_dmac64(dc)) { + channel64_clear_CHAR(dc); + channel_writeq(dc, SAR, 0); + channel_writeq(dc, DAR, 0); + } else { + channel_writel(dc, CHAR, 0); + channel_writel(dc, SAR, 0); + channel_writel(dc, DAR, 0); + } + channel_writel(dc, CNTR, 0); + channel_writel(dc, SAIR, 0); + channel_writel(dc, DAIR, 0); + channel_writel(dc, CCR, 0); + mmiowb(); +} + +/* Called with dc->lock held and bh disabled */ +static void txx9dmac_dostart(struct txx9dmac_chan *dc, + struct txx9dmac_desc *first) +{ + struct txx9dmac_slave *ds = dc->chan.private; + u32 sai, dai; + + dev_vdbg(chan2dev(&dc->chan), "dostart %u %p\n", + first->txd.cookie, first); + /* ASSERT: channel is idle */ + if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) { + dev_err(chan2dev(&dc->chan), + "BUG: Attempted to start non-idle channel\n"); + txx9dmac_dump_regs(dc); + /* The tasklet will hopefully advance the queue... */ + return; + } + + if (is_dmac64(dc)) { + channel64_writel(dc, CNTR, 0); + channel64_writel(dc, CSR, 0xffffffff); + if (ds) { + if (ds->tx_reg) { + sai = ds->reg_width; + dai = 0; + } else { + sai = 0; + dai = ds->reg_width; + } + } else { + sai = 8; + dai = 8; + } + channel64_writel(dc, SAIR, sai); + channel64_writel(dc, DAIR, dai); + /* All 64-bit DMAC supports SMPCHN */ + channel64_writel(dc, CCR, dc->ccr); + /* Writing a non zero value to CHAR will assert XFACT */ + channel64_write_CHAR(dc, first->txd.phys); + } else { + channel32_writel(dc, CNTR, 0); + channel32_writel(dc, CSR, 0xffffffff); + if (ds) { + if (ds->tx_reg) { + sai = ds->reg_width; + dai = 0; + } else { + sai = 0; + dai = ds->reg_width; + } + } else { + sai = 4; + dai = 4; + } + channel32_writel(dc, SAIR, sai); + channel32_writel(dc, DAIR, dai); + if (txx9_dma_have_SMPCHN()) { + channel32_writel(dc, CCR, dc->ccr); + /* Writing a non zero value to CHAR will assert XFACT */ + channel32_writel(dc, CHAR, first->txd.phys); + } else { + channel32_writel(dc, CHAR, first->txd.phys); + channel32_writel(dc, CCR, dc->ccr); + } + } +} + +/*----------------------------------------------------------------------*/ + +static void +txx9dmac_descriptor_complete(struct txx9dmac_chan *dc, + struct txx9dmac_desc *desc) +{ + dma_async_tx_callback callback; + void *param; + struct dma_async_tx_descriptor *txd = &desc->txd; + + dev_vdbg(chan2dev(&dc->chan), "descriptor %u %p complete\n", + txd->cookie, desc); + + dma_cookie_complete(txd); + callback = txd->callback; + param = txd->callback_param; + + txx9dmac_sync_desc_for_cpu(dc, desc); + list_splice_init(&desc->tx_list, &dc->free_list); + list_move(&desc->desc_node, &dc->free_list); + + dma_descriptor_unmap(txd); + /* + * The API requires that no submissions are done from a + * callback, so we don't need to drop the lock here + */ + if (callback) + callback(param); + dma_run_dependencies(txd); +} + +static void txx9dmac_dequeue(struct txx9dmac_chan *dc, struct list_head *list) +{ + struct txx9dmac_dev *ddev = dc->ddev; + struct txx9dmac_desc *desc; + struct txx9dmac_desc *prev = NULL; + + BUG_ON(!list_empty(list)); + do { + desc = txx9dmac_first_queued(dc); + if (prev) { + desc_write_CHAR(dc, prev, desc->txd.phys); + dma_sync_single_for_device(chan2parent(&dc->chan), + prev->txd.phys, ddev->descsize, + DMA_TO_DEVICE); + } + prev = txx9dmac_last_child(desc); + list_move_tail(&desc->desc_node, list); + /* Make chain-completion interrupt happen */ + if ((desc->txd.flags & DMA_PREP_INTERRUPT) && + !txx9dmac_chan_INTENT(dc)) + break; + } while (!list_empty(&dc->queue)); +} + +static void txx9dmac_complete_all(struct txx9dmac_chan *dc) +{ + struct txx9dmac_desc *desc, *_desc; + LIST_HEAD(list); + + /* + * Submit queued descriptors ASAP, i.e. before we go through + * the completed ones. + */ + list_splice_init(&dc->active_list, &list); + if (!list_empty(&dc->queue)) { + txx9dmac_dequeue(dc, &dc->active_list); + txx9dmac_dostart(dc, txx9dmac_first_active(dc)); + } + + list_for_each_entry_safe(desc, _desc, &list, desc_node) + txx9dmac_descriptor_complete(dc, desc); +} + +static void txx9dmac_dump_desc(struct txx9dmac_chan *dc, + struct txx9dmac_hwdesc *desc) +{ + if (is_dmac64(dc)) { +#ifdef TXX9_DMA_USE_SIMPLE_CHAIN + dev_crit(chan2dev(&dc->chan), + " desc: ch%#llx s%#llx d%#llx c%#x\n", + (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR); +#else + dev_crit(chan2dev(&dc->chan), + " desc: ch%#llx s%#llx d%#llx c%#x" + " si%#x di%#x cc%#x cs%#x\n", + (u64)desc->CHAR, desc->SAR, desc->DAR, desc->CNTR, + desc->SAIR, desc->DAIR, desc->CCR, desc->CSR); +#endif + } else { + struct txx9dmac_hwdesc32 *d = (struct txx9dmac_hwdesc32 *)desc; +#ifdef TXX9_DMA_USE_SIMPLE_CHAIN + dev_crit(chan2dev(&dc->chan), + " desc: ch%#x s%#x d%#x c%#x\n", + d->CHAR, d->SAR, d->DAR, d->CNTR); +#else + dev_crit(chan2dev(&dc->chan), + " desc: ch%#x s%#x d%#x c%#x" + " si%#x di%#x cc%#x cs%#x\n", + d->CHAR, d->SAR, d->DAR, d->CNTR, + d->SAIR, d->DAIR, d->CCR, d->CSR); +#endif + } +} + +static void txx9dmac_handle_error(struct txx9dmac_chan *dc, u32 csr) +{ + struct txx9dmac_desc *bad_desc; + struct txx9dmac_desc *child; + u32 errors; + + /* + * The descriptor currently at the head of the active list is + * borked. Since we don't have any way to report errors, we'll + * just have to scream loudly and try to carry on. + */ + dev_crit(chan2dev(&dc->chan), "Abnormal Chain Completion\n"); + txx9dmac_dump_regs(dc); + + bad_desc = txx9dmac_first_active(dc); + list_del_init(&bad_desc->desc_node); + + /* Clear all error flags and try to restart the controller */ + errors = csr & (TXX9_DMA_CSR_ABCHC | + TXX9_DMA_CSR_CFERR | TXX9_DMA_CSR_CHERR | + TXX9_DMA_CSR_DESERR | TXX9_DMA_CSR_SORERR); + channel_writel(dc, CSR, errors); + + if (list_empty(&dc->active_list) && !list_empty(&dc->queue)) + txx9dmac_dequeue(dc, &dc->active_list); + if (!list_empty(&dc->active_list)) + txx9dmac_dostart(dc, txx9dmac_first_active(dc)); + + dev_crit(chan2dev(&dc->chan), + "Bad descriptor submitted for DMA! (cookie: %d)\n", + bad_desc->txd.cookie); + txx9dmac_dump_desc(dc, &bad_desc->hwdesc); + list_for_each_entry(child, &bad_desc->tx_list, desc_node) + txx9dmac_dump_desc(dc, &child->hwdesc); + /* Pretend the descriptor completed successfully */ + txx9dmac_descriptor_complete(dc, bad_desc); +} + +static void txx9dmac_scan_descriptors(struct txx9dmac_chan *dc) +{ + dma_addr_t chain; + struct txx9dmac_desc *desc, *_desc; + struct txx9dmac_desc *child; + u32 csr; + + if (is_dmac64(dc)) { + chain = channel64_read_CHAR(dc); + csr = channel64_readl(dc, CSR); + channel64_writel(dc, CSR, csr); + } else { + chain = channel32_readl(dc, CHAR); + csr = channel32_readl(dc, CSR); + channel32_writel(dc, CSR, csr); + } + /* For dynamic chain, we should look at XFACT instead of NCHNC */ + if (!(csr & (TXX9_DMA_CSR_XFACT | TXX9_DMA_CSR_ABCHC))) { + /* Everything we've submitted is done */ + txx9dmac_complete_all(dc); + return; + } + if (!(csr & TXX9_DMA_CSR_CHNEN)) + chain = 0; /* last descriptor of this chain */ + + dev_vdbg(chan2dev(&dc->chan), "scan_descriptors: char=%#llx\n", + (u64)chain); + + list_for_each_entry_safe(desc, _desc, &dc->active_list, desc_node) { + if (desc_read_CHAR(dc, desc) == chain) { + /* This one is currently in progress */ + if (csr & TXX9_DMA_CSR_ABCHC) + goto scan_done; + return; + } + + list_for_each_entry(child, &desc->tx_list, desc_node) + if (desc_read_CHAR(dc, child) == chain) { + /* Currently in progress */ + if (csr & TXX9_DMA_CSR_ABCHC) + goto scan_done; + return; + } + + /* + * No descriptors so far seem to be in progress, i.e. + * this one must be done. + */ + txx9dmac_descriptor_complete(dc, desc); + } +scan_done: + if (csr & TXX9_DMA_CSR_ABCHC) { + txx9dmac_handle_error(dc, csr); + return; + } + + dev_err(chan2dev(&dc->chan), + "BUG: All descriptors done, but channel not idle!\n"); + + /* Try to continue after resetting the channel... */ + txx9dmac_reset_chan(dc); + + if (!list_empty(&dc->queue)) { + txx9dmac_dequeue(dc, &dc->active_list); + txx9dmac_dostart(dc, txx9dmac_first_active(dc)); + } +} + +static void txx9dmac_chan_tasklet(unsigned long data) +{ + int irq; + u32 csr; + struct txx9dmac_chan *dc; + + dc = (struct txx9dmac_chan *)data; + csr = channel_readl(dc, CSR); + dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", csr); + + spin_lock(&dc->lock); + if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC | + TXX9_DMA_CSR_NTRNFC)) + txx9dmac_scan_descriptors(dc); + spin_unlock(&dc->lock); + irq = dc->irq; + + enable_irq(irq); +} + +static irqreturn_t txx9dmac_chan_interrupt(int irq, void *dev_id) +{ + struct txx9dmac_chan *dc = dev_id; + + dev_vdbg(chan2dev(&dc->chan), "interrupt: status=%#x\n", + channel_readl(dc, CSR)); + + tasklet_schedule(&dc->tasklet); + /* + * Just disable the interrupts. We'll turn them back on in the + * softirq handler. + */ + disable_irq_nosync(irq); + + return IRQ_HANDLED; +} + +static void txx9dmac_tasklet(unsigned long data) +{ + int irq; + u32 csr; + struct txx9dmac_chan *dc; + + struct txx9dmac_dev *ddev = (struct txx9dmac_dev *)data; + u32 mcr; + int i; + + mcr = dma_readl(ddev, MCR); + dev_vdbg(ddev->chan[0]->dma.dev, "tasklet: mcr=%x\n", mcr); + for (i = 0; i < TXX9_DMA_MAX_NR_CHANNELS; i++) { + if ((mcr >> (24 + i)) & 0x11) { + dc = ddev->chan[i]; + csr = channel_readl(dc, CSR); + dev_vdbg(chan2dev(&dc->chan), "tasklet: status=%x\n", + csr); + spin_lock(&dc->lock); + if (csr & (TXX9_DMA_CSR_ABCHC | TXX9_DMA_CSR_NCHNC | + TXX9_DMA_CSR_NTRNFC)) + txx9dmac_scan_descriptors(dc); + spin_unlock(&dc->lock); + } + } + irq = ddev->irq; + + enable_irq(irq); +} + +static irqreturn_t txx9dmac_interrupt(int irq, void *dev_id) +{ + struct txx9dmac_dev *ddev = dev_id; + + dev_vdbg(ddev->chan[0]->dma.dev, "interrupt: status=%#x\n", + dma_readl(ddev, MCR)); + + tasklet_schedule(&ddev->tasklet); + /* + * Just disable the interrupts. We'll turn them back on in the + * softirq handler. + */ + disable_irq_nosync(irq); + + return IRQ_HANDLED; +} + +/*----------------------------------------------------------------------*/ + +static dma_cookie_t txx9dmac_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct txx9dmac_desc *desc = txd_to_txx9dmac_desc(tx); + struct txx9dmac_chan *dc = to_txx9dmac_chan(tx->chan); + dma_cookie_t cookie; + + spin_lock_bh(&dc->lock); + cookie = dma_cookie_assign(tx); + + dev_vdbg(chan2dev(tx->chan), "tx_submit: queued %u %p\n", + desc->txd.cookie, desc); + + list_add_tail(&desc->desc_node, &dc->queue); + spin_unlock_bh(&dc->lock); + + return cookie; +} + +static struct dma_async_tx_descriptor * +txx9dmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); + struct txx9dmac_dev *ddev = dc->ddev; + struct txx9dmac_desc *desc; + struct txx9dmac_desc *first; + struct txx9dmac_desc *prev; + size_t xfer_count; + size_t offset; + + dev_vdbg(chan2dev(chan), "prep_dma_memcpy d%#llx s%#llx l%#zx f%#lx\n", + (u64)dest, (u64)src, len, flags); + + if (unlikely(!len)) { + dev_dbg(chan2dev(chan), "prep_dma_memcpy: length is zero!\n"); + return NULL; + } + + prev = first = NULL; + + for (offset = 0; offset < len; offset += xfer_count) { + xfer_count = min_t(size_t, len - offset, TXX9_DMA_MAX_COUNT); + /* + * Workaround for ERT-TX49H2-033, ERT-TX49H3-020, + * ERT-TX49H4-016 (slightly conservative) + */ + if (__is_dmac64(ddev)) { + if (xfer_count > 0x100 && + (xfer_count & 0xff) >= 0xfa && + (xfer_count & 0xff) <= 0xff) + xfer_count -= 0x20; + } else { + if (xfer_count > 0x80 && + (xfer_count & 0x7f) >= 0x7e && + (xfer_count & 0x7f) <= 0x7f) + xfer_count -= 0x20; + } + + desc = txx9dmac_desc_get(dc); + if (!desc) { + txx9dmac_desc_put(dc, first); + return NULL; + } + + if (__is_dmac64(ddev)) { + desc->hwdesc.SAR = src + offset; + desc->hwdesc.DAR = dest + offset; + desc->hwdesc.CNTR = xfer_count; + txx9dmac_desc_set_nosimple(ddev, desc, 8, 8, + dc->ccr | TXX9_DMA_CCR_XFACT); + } else { + desc->hwdesc32.SAR = src + offset; + desc->hwdesc32.DAR = dest + offset; + desc->hwdesc32.CNTR = xfer_count; + txx9dmac_desc_set_nosimple(ddev, desc, 4, 4, + dc->ccr | TXX9_DMA_CCR_XFACT); + } + + /* + * The descriptors on tx_list are not reachable from + * the dc->queue list or dc->active_list after a + * submit. If we put all descriptors on active_list, + * calling of callback on the completion will be more + * complex. + */ + if (!first) { + first = desc; + } else { + desc_write_CHAR(dc, prev, desc->txd.phys); + dma_sync_single_for_device(chan2parent(&dc->chan), + prev->txd.phys, ddev->descsize, + DMA_TO_DEVICE); + list_add_tail(&desc->desc_node, &first->tx_list); + } + prev = desc; + } + + /* Trigger interrupt after last block */ + if (flags & DMA_PREP_INTERRUPT) + txx9dmac_desc_set_INTENT(ddev, prev); + + desc_write_CHAR(dc, prev, 0); + dma_sync_single_for_device(chan2parent(&dc->chan), + prev->txd.phys, ddev->descsize, + DMA_TO_DEVICE); + + first->txd.flags = flags; + first->len = len; + + return &first->txd; +} + +static struct dma_async_tx_descriptor * +txx9dmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); + struct txx9dmac_dev *ddev = dc->ddev; + struct txx9dmac_slave *ds = chan->private; + struct txx9dmac_desc *prev; + struct txx9dmac_desc *first; + unsigned int i; + struct scatterlist *sg; + + dev_vdbg(chan2dev(chan), "prep_dma_slave\n"); + + BUG_ON(!ds || !ds->reg_width); + if (ds->tx_reg) + BUG_ON(direction != DMA_MEM_TO_DEV); + else + BUG_ON(direction != DMA_DEV_TO_MEM); + if (unlikely(!sg_len)) + return NULL; + + prev = first = NULL; + + for_each_sg(sgl, sg, sg_len, i) { + struct txx9dmac_desc *desc; + dma_addr_t mem; + u32 sai, dai; + + desc = txx9dmac_desc_get(dc); + if (!desc) { + txx9dmac_desc_put(dc, first); + return NULL; + } + + mem = sg_dma_address(sg); + + if (__is_dmac64(ddev)) { + if (direction == DMA_MEM_TO_DEV) { + desc->hwdesc.SAR = mem; + desc->hwdesc.DAR = ds->tx_reg; + } else { + desc->hwdesc.SAR = ds->rx_reg; + desc->hwdesc.DAR = mem; + } + desc->hwdesc.CNTR = sg_dma_len(sg); + } else { + if (direction == DMA_MEM_TO_DEV) { + desc->hwdesc32.SAR = mem; + desc->hwdesc32.DAR = ds->tx_reg; + } else { + desc->hwdesc32.SAR = ds->rx_reg; + desc->hwdesc32.DAR = mem; + } + desc->hwdesc32.CNTR = sg_dma_len(sg); + } + if (direction == DMA_MEM_TO_DEV) { + sai = ds->reg_width; + dai = 0; + } else { + sai = 0; + dai = ds->reg_width; + } + txx9dmac_desc_set_nosimple(ddev, desc, sai, dai, + dc->ccr | TXX9_DMA_CCR_XFACT); + + if (!first) { + first = desc; + } else { + desc_write_CHAR(dc, prev, desc->txd.phys); + dma_sync_single_for_device(chan2parent(&dc->chan), + prev->txd.phys, + ddev->descsize, + DMA_TO_DEVICE); + list_add_tail(&desc->desc_node, &first->tx_list); + } + prev = desc; + } + + /* Trigger interrupt after last block */ + if (flags & DMA_PREP_INTERRUPT) + txx9dmac_desc_set_INTENT(ddev, prev); + + desc_write_CHAR(dc, prev, 0); + dma_sync_single_for_device(chan2parent(&dc->chan), + prev->txd.phys, ddev->descsize, + DMA_TO_DEVICE); + + first->txd.flags = flags; + first->len = 0; + + return &first->txd; +} + +static int txx9dmac_terminate_all(struct dma_chan *chan) +{ + struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); + struct txx9dmac_desc *desc, *_desc; + LIST_HEAD(list); + + dev_vdbg(chan2dev(chan), "terminate_all\n"); + spin_lock_bh(&dc->lock); + + txx9dmac_reset_chan(dc); + + /* active_list entries will end up before queued entries */ + list_splice_init(&dc->queue, &list); + list_splice_init(&dc->active_list, &list); + + spin_unlock_bh(&dc->lock); + + /* Flush all pending and queued descriptors */ + list_for_each_entry_safe(desc, _desc, &list, desc_node) + txx9dmac_descriptor_complete(dc, desc); + + return 0; +} + +static enum dma_status +txx9dmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); + enum dma_status ret; + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return DMA_COMPLETE; + + spin_lock_bh(&dc->lock); + txx9dmac_scan_descriptors(dc); + spin_unlock_bh(&dc->lock); + + return dma_cookie_status(chan, cookie, txstate); +} + +static void txx9dmac_chain_dynamic(struct txx9dmac_chan *dc, + struct txx9dmac_desc *prev) +{ + struct txx9dmac_dev *ddev = dc->ddev; + struct txx9dmac_desc *desc; + LIST_HEAD(list); + + prev = txx9dmac_last_child(prev); + txx9dmac_dequeue(dc, &list); + desc = list_entry(list.next, struct txx9dmac_desc, desc_node); + desc_write_CHAR(dc, prev, desc->txd.phys); + dma_sync_single_for_device(chan2parent(&dc->chan), + prev->txd.phys, ddev->descsize, + DMA_TO_DEVICE); + mmiowb(); + if (!(channel_readl(dc, CSR) & TXX9_DMA_CSR_CHNEN) && + channel_read_CHAR(dc) == prev->txd.phys) + /* Restart chain DMA */ + channel_write_CHAR(dc, desc->txd.phys); + list_splice_tail(&list, &dc->active_list); +} + +static void txx9dmac_issue_pending(struct dma_chan *chan) +{ + struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); + + spin_lock_bh(&dc->lock); + + if (!list_empty(&dc->active_list)) + txx9dmac_scan_descriptors(dc); + if (!list_empty(&dc->queue)) { + if (list_empty(&dc->active_list)) { + txx9dmac_dequeue(dc, &dc->active_list); + txx9dmac_dostart(dc, txx9dmac_first_active(dc)); + } else if (txx9_dma_have_SMPCHN()) { + struct txx9dmac_desc *prev = txx9dmac_last_active(dc); + + if (!(prev->txd.flags & DMA_PREP_INTERRUPT) || + txx9dmac_chan_INTENT(dc)) + txx9dmac_chain_dynamic(dc, prev); + } + } + + spin_unlock_bh(&dc->lock); +} + +static int txx9dmac_alloc_chan_resources(struct dma_chan *chan) +{ + struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); + struct txx9dmac_slave *ds = chan->private; + struct txx9dmac_desc *desc; + int i; + + dev_vdbg(chan2dev(chan), "alloc_chan_resources\n"); + + /* ASSERT: channel is idle */ + if (channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT) { + dev_dbg(chan2dev(chan), "DMA channel not idle?\n"); + return -EIO; + } + + dma_cookie_init(chan); + + dc->ccr = TXX9_DMA_CCR_IMMCHN | TXX9_DMA_CCR_INTENE | CCR_LE; + txx9dmac_chan_set_SMPCHN(dc); + if (!txx9_dma_have_SMPCHN() || (dc->ccr & TXX9_DMA_CCR_SMPCHN)) + dc->ccr |= TXX9_DMA_CCR_INTENC; + if (chan->device->device_prep_dma_memcpy) { + if (ds) + return -EINVAL; + dc->ccr |= TXX9_DMA_CCR_XFSZ_X8; + } else { + if (!ds || + (ds->tx_reg && ds->rx_reg) || (!ds->tx_reg && !ds->rx_reg)) + return -EINVAL; + dc->ccr |= TXX9_DMA_CCR_EXTRQ | + TXX9_DMA_CCR_XFSZ(__ffs(ds->reg_width)); + txx9dmac_chan_set_INTENT(dc); + } + + spin_lock_bh(&dc->lock); + i = dc->descs_allocated; + while (dc->descs_allocated < TXX9_DMA_INITIAL_DESC_COUNT) { + spin_unlock_bh(&dc->lock); + + desc = txx9dmac_desc_alloc(dc, GFP_KERNEL); + if (!desc) { + dev_info(chan2dev(chan), + "only allocated %d descriptors\n", i); + spin_lock_bh(&dc->lock); + break; + } + txx9dmac_desc_put(dc, desc); + + spin_lock_bh(&dc->lock); + i = ++dc->descs_allocated; + } + spin_unlock_bh(&dc->lock); + + dev_dbg(chan2dev(chan), + "alloc_chan_resources allocated %d descriptors\n", i); + + return i; +} + +static void txx9dmac_free_chan_resources(struct dma_chan *chan) +{ + struct txx9dmac_chan *dc = to_txx9dmac_chan(chan); + struct txx9dmac_dev *ddev = dc->ddev; + struct txx9dmac_desc *desc, *_desc; + LIST_HEAD(list); + + dev_dbg(chan2dev(chan), "free_chan_resources (descs allocated=%u)\n", + dc->descs_allocated); + + /* ASSERT: channel is idle */ + BUG_ON(!list_empty(&dc->active_list)); + BUG_ON(!list_empty(&dc->queue)); + BUG_ON(channel_readl(dc, CSR) & TXX9_DMA_CSR_XFACT); + + spin_lock_bh(&dc->lock); + list_splice_init(&dc->free_list, &list); + dc->descs_allocated = 0; + spin_unlock_bh(&dc->lock); + + list_for_each_entry_safe(desc, _desc, &list, desc_node) { + dev_vdbg(chan2dev(chan), " freeing descriptor %p\n", desc); + dma_unmap_single(chan2parent(chan), desc->txd.phys, + ddev->descsize, DMA_TO_DEVICE); + kfree(desc); + } + + dev_vdbg(chan2dev(chan), "free_chan_resources done\n"); +} + +/*----------------------------------------------------------------------*/ + +static void txx9dmac_off(struct txx9dmac_dev *ddev) +{ + dma_writel(ddev, MCR, 0); + mmiowb(); +} + +static int __init txx9dmac_chan_probe(struct platform_device *pdev) +{ + struct txx9dmac_chan_platform_data *cpdata = + dev_get_platdata(&pdev->dev); + struct platform_device *dmac_dev = cpdata->dmac_dev; + struct txx9dmac_platform_data *pdata = dev_get_platdata(&dmac_dev->dev); + struct txx9dmac_chan *dc; + int err; + int ch = pdev->id % TXX9_DMA_MAX_NR_CHANNELS; + int irq; + + dc = devm_kzalloc(&pdev->dev, sizeof(*dc), GFP_KERNEL); + if (!dc) + return -ENOMEM; + + dc->dma.dev = &pdev->dev; + dc->dma.device_alloc_chan_resources = txx9dmac_alloc_chan_resources; + dc->dma.device_free_chan_resources = txx9dmac_free_chan_resources; + dc->dma.device_terminate_all = txx9dmac_terminate_all; + dc->dma.device_tx_status = txx9dmac_tx_status; + dc->dma.device_issue_pending = txx9dmac_issue_pending; + if (pdata && pdata->memcpy_chan == ch) { + dc->dma.device_prep_dma_memcpy = txx9dmac_prep_dma_memcpy; + dma_cap_set(DMA_MEMCPY, dc->dma.cap_mask); + } else { + dc->dma.device_prep_slave_sg = txx9dmac_prep_slave_sg; + dma_cap_set(DMA_SLAVE, dc->dma.cap_mask); + dma_cap_set(DMA_PRIVATE, dc->dma.cap_mask); + } + + INIT_LIST_HEAD(&dc->dma.channels); + dc->ddev = platform_get_drvdata(dmac_dev); + if (dc->ddev->irq < 0) { + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + tasklet_init(&dc->tasklet, txx9dmac_chan_tasklet, + (unsigned long)dc); + dc->irq = irq; + err = devm_request_irq(&pdev->dev, dc->irq, + txx9dmac_chan_interrupt, 0, dev_name(&pdev->dev), dc); + if (err) + return err; + } else + dc->irq = -1; + dc->ddev->chan[ch] = dc; + dc->chan.device = &dc->dma; + list_add_tail(&dc->chan.device_node, &dc->chan.device->channels); + dma_cookie_init(&dc->chan); + + if (is_dmac64(dc)) + dc->ch_regs = &__txx9dmac_regs(dc->ddev)->CHAN[ch]; + else + dc->ch_regs = &__txx9dmac_regs32(dc->ddev)->CHAN[ch]; + spin_lock_init(&dc->lock); + + INIT_LIST_HEAD(&dc->active_list); + INIT_LIST_HEAD(&dc->queue); + INIT_LIST_HEAD(&dc->free_list); + + txx9dmac_reset_chan(dc); + + platform_set_drvdata(pdev, dc); + + err = dma_async_device_register(&dc->dma); + if (err) + return err; + dev_dbg(&pdev->dev, "TXx9 DMA Channel (dma%d%s%s)\n", + dc->dma.dev_id, + dma_has_cap(DMA_MEMCPY, dc->dma.cap_mask) ? " memcpy" : "", + dma_has_cap(DMA_SLAVE, dc->dma.cap_mask) ? " slave" : ""); + + return 0; +} + +static int txx9dmac_chan_remove(struct platform_device *pdev) +{ + struct txx9dmac_chan *dc = platform_get_drvdata(pdev); + + dma_async_device_unregister(&dc->dma); + if (dc->irq >= 0) + tasklet_kill(&dc->tasklet); + dc->ddev->chan[pdev->id % TXX9_DMA_MAX_NR_CHANNELS] = NULL; + return 0; +} + +static int __init txx9dmac_probe(struct platform_device *pdev) +{ + struct txx9dmac_platform_data *pdata = dev_get_platdata(&pdev->dev); + struct resource *io; + struct txx9dmac_dev *ddev; + u32 mcr; + int err; + + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!io) + return -EINVAL; + + ddev = devm_kzalloc(&pdev->dev, sizeof(*ddev), GFP_KERNEL); + if (!ddev) + return -ENOMEM; + + if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), + dev_name(&pdev->dev))) + return -EBUSY; + + ddev->regs = devm_ioremap(&pdev->dev, io->start, resource_size(io)); + if (!ddev->regs) + return -ENOMEM; + ddev->have_64bit_regs = pdata->have_64bit_regs; + if (__is_dmac64(ddev)) + ddev->descsize = sizeof(struct txx9dmac_hwdesc); + else + ddev->descsize = sizeof(struct txx9dmac_hwdesc32); + + /* force dma off, just in case */ + txx9dmac_off(ddev); + + ddev->irq = platform_get_irq(pdev, 0); + if (ddev->irq >= 0) { + tasklet_init(&ddev->tasklet, txx9dmac_tasklet, + (unsigned long)ddev); + err = devm_request_irq(&pdev->dev, ddev->irq, + txx9dmac_interrupt, 0, dev_name(&pdev->dev), ddev); + if (err) + return err; + } + + mcr = TXX9_DMA_MCR_MSTEN | MCR_LE; + if (pdata && pdata->memcpy_chan >= 0) + mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan); + dma_writel(ddev, MCR, mcr); + + platform_set_drvdata(pdev, ddev); + return 0; +} + +static int txx9dmac_remove(struct platform_device *pdev) +{ + struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); + + txx9dmac_off(ddev); + if (ddev->irq >= 0) + tasklet_kill(&ddev->tasklet); + return 0; +} + +static void txx9dmac_shutdown(struct platform_device *pdev) +{ + struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); + + txx9dmac_off(ddev); +} + +static int txx9dmac_suspend_noirq(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); + + txx9dmac_off(ddev); + return 0; +} + +static int txx9dmac_resume_noirq(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct txx9dmac_dev *ddev = platform_get_drvdata(pdev); + struct txx9dmac_platform_data *pdata = dev_get_platdata(&pdev->dev); + u32 mcr; + + mcr = TXX9_DMA_MCR_MSTEN | MCR_LE; + if (pdata && pdata->memcpy_chan >= 0) + mcr |= TXX9_DMA_MCR_FIFUM(pdata->memcpy_chan); + dma_writel(ddev, MCR, mcr); + return 0; + +} + +static const struct dev_pm_ops txx9dmac_dev_pm_ops = { + .suspend_noirq = txx9dmac_suspend_noirq, + .resume_noirq = txx9dmac_resume_noirq, +}; + +static struct platform_driver txx9dmac_chan_driver = { + .remove = txx9dmac_chan_remove, + .driver = { + .name = "txx9dmac-chan", + }, +}; + +static struct platform_driver txx9dmac_driver = { + .remove = txx9dmac_remove, + .shutdown = txx9dmac_shutdown, + .driver = { + .name = "txx9dmac", + .pm = &txx9dmac_dev_pm_ops, + }, +}; + +static int __init txx9dmac_init(void) +{ + int rc; + + rc = platform_driver_probe(&txx9dmac_driver, txx9dmac_probe); + if (!rc) { + rc = platform_driver_probe(&txx9dmac_chan_driver, + txx9dmac_chan_probe); + if (rc) + platform_driver_unregister(&txx9dmac_driver); + } + return rc; +} +module_init(txx9dmac_init); + +static void __exit txx9dmac_exit(void) +{ + platform_driver_unregister(&txx9dmac_chan_driver); + platform_driver_unregister(&txx9dmac_driver); +} +module_exit(txx9dmac_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("TXx9 DMA Controller driver"); +MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>"); +MODULE_ALIAS("platform:txx9dmac"); +MODULE_ALIAS("platform:txx9dmac-chan"); diff --git a/drivers/dma/txx9dmac.h b/drivers/dma/txx9dmac.h new file mode 100644 index 000000000..f6517b928 --- /dev/null +++ b/drivers/dma/txx9dmac.h @@ -0,0 +1,307 @@ +/* + * Driver for the TXx9 SoC DMA Controller + * + * Copyright (C) 2009 Atsushi Nemoto + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef TXX9DMAC_H +#define TXX9DMAC_H + +#include <linux/dmaengine.h> +#include <asm/txx9/dmac.h> + +/* + * Design Notes: + * + * This DMAC have four channels and one FIFO buffer. Each channel can + * be configured for memory-memory or device-memory transfer, but only + * one channel can do alignment-free memory-memory transfer at a time + * while the channel should occupy the FIFO buffer for effective + * transfers. + * + * Instead of dynamically assign the FIFO buffer to channels, I chose + * make one dedicated channel for memory-memory transfer. The + * dedicated channel is public. Other channels are private and used + * for slave transfer. Some devices in the SoC are wired to certain + * DMA channel. + */ + +#ifdef CONFIG_MACH_TX49XX +static inline bool txx9_dma_have_SMPCHN(void) +{ + return true; +} +#define TXX9_DMA_USE_SIMPLE_CHAIN +#else +static inline bool txx9_dma_have_SMPCHN(void) +{ + return false; +} +#endif + +#ifdef __LITTLE_ENDIAN +#ifdef CONFIG_MACH_TX49XX +#define CCR_LE TXX9_DMA_CCR_LE +#define MCR_LE 0 +#else +#define CCR_LE 0 +#define MCR_LE TXX9_DMA_MCR_LE +#endif +#else +#define CCR_LE 0 +#define MCR_LE 0 +#endif + +/* + * Redefine this macro to handle differences between 32- and 64-bit + * addressing, big vs. little endian, etc. + */ +#ifdef __BIG_ENDIAN +#define TXX9_DMA_REG32(name) u32 __pad_##name; u32 name +#else +#define TXX9_DMA_REG32(name) u32 name; u32 __pad_##name +#endif + +/* Hardware register definitions. */ +struct txx9dmac_cregs { +#if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) + TXX9_DMA_REG32(CHAR); /* Chain Address Register */ +#else + u64 CHAR; /* Chain Address Register */ +#endif + u64 SAR; /* Source Address Register */ + u64 DAR; /* Destination Address Register */ + TXX9_DMA_REG32(CNTR); /* Count Register */ + TXX9_DMA_REG32(SAIR); /* Source Address Increment Register */ + TXX9_DMA_REG32(DAIR); /* Destination Address Increment Register */ + TXX9_DMA_REG32(CCR); /* Channel Control Register */ + TXX9_DMA_REG32(CSR); /* Channel Status Register */ +}; +struct txx9dmac_cregs32 { + u32 CHAR; + u32 SAR; + u32 DAR; + u32 CNTR; + u32 SAIR; + u32 DAIR; + u32 CCR; + u32 CSR; +}; + +struct txx9dmac_regs { + /* per-channel registers */ + struct txx9dmac_cregs CHAN[TXX9_DMA_MAX_NR_CHANNELS]; + u64 __pad[9]; + u64 MFDR; /* Memory Fill Data Register */ + TXX9_DMA_REG32(MCR); /* Master Control Register */ +}; +struct txx9dmac_regs32 { + struct txx9dmac_cregs32 CHAN[TXX9_DMA_MAX_NR_CHANNELS]; + u32 __pad[9]; + u32 MFDR; + u32 MCR; +}; + +/* bits for MCR */ +#define TXX9_DMA_MCR_EIS(ch) (0x10000000<<(ch)) +#define TXX9_DMA_MCR_DIS(ch) (0x01000000<<(ch)) +#define TXX9_DMA_MCR_RSFIF 0x00000080 +#define TXX9_DMA_MCR_FIFUM(ch) (0x00000008<<(ch)) +#define TXX9_DMA_MCR_LE 0x00000004 +#define TXX9_DMA_MCR_RPRT 0x00000002 +#define TXX9_DMA_MCR_MSTEN 0x00000001 + +/* bits for CCRn */ +#define TXX9_DMA_CCR_IMMCHN 0x20000000 +#define TXX9_DMA_CCR_USEXFSZ 0x10000000 +#define TXX9_DMA_CCR_LE 0x08000000 +#define TXX9_DMA_CCR_DBINH 0x04000000 +#define TXX9_DMA_CCR_SBINH 0x02000000 +#define TXX9_DMA_CCR_CHRST 0x01000000 +#define TXX9_DMA_CCR_RVBYTE 0x00800000 +#define TXX9_DMA_CCR_ACKPOL 0x00400000 +#define TXX9_DMA_CCR_REQPL 0x00200000 +#define TXX9_DMA_CCR_EGREQ 0x00100000 +#define TXX9_DMA_CCR_CHDN 0x00080000 +#define TXX9_DMA_CCR_DNCTL 0x00060000 +#define TXX9_DMA_CCR_EXTRQ 0x00010000 +#define TXX9_DMA_CCR_INTRQD 0x0000e000 +#define TXX9_DMA_CCR_INTENE 0x00001000 +#define TXX9_DMA_CCR_INTENC 0x00000800 +#define TXX9_DMA_CCR_INTENT 0x00000400 +#define TXX9_DMA_CCR_CHNEN 0x00000200 +#define TXX9_DMA_CCR_XFACT 0x00000100 +#define TXX9_DMA_CCR_SMPCHN 0x00000020 +#define TXX9_DMA_CCR_XFSZ(order) (((order) << 2) & 0x0000001c) +#define TXX9_DMA_CCR_XFSZ_1 TXX9_DMA_CCR_XFSZ(0) +#define TXX9_DMA_CCR_XFSZ_2 TXX9_DMA_CCR_XFSZ(1) +#define TXX9_DMA_CCR_XFSZ_4 TXX9_DMA_CCR_XFSZ(2) +#define TXX9_DMA_CCR_XFSZ_8 TXX9_DMA_CCR_XFSZ(3) +#define TXX9_DMA_CCR_XFSZ_X4 TXX9_DMA_CCR_XFSZ(4) +#define TXX9_DMA_CCR_XFSZ_X8 TXX9_DMA_CCR_XFSZ(5) +#define TXX9_DMA_CCR_XFSZ_X16 TXX9_DMA_CCR_XFSZ(6) +#define TXX9_DMA_CCR_XFSZ_X32 TXX9_DMA_CCR_XFSZ(7) +#define TXX9_DMA_CCR_MEMIO 0x00000002 +#define TXX9_DMA_CCR_SNGAD 0x00000001 + +/* bits for CSRn */ +#define TXX9_DMA_CSR_CHNEN 0x00000400 +#define TXX9_DMA_CSR_STLXFER 0x00000200 +#define TXX9_DMA_CSR_XFACT 0x00000100 +#define TXX9_DMA_CSR_ABCHC 0x00000080 +#define TXX9_DMA_CSR_NCHNC 0x00000040 +#define TXX9_DMA_CSR_NTRNFC 0x00000020 +#define TXX9_DMA_CSR_EXTDN 0x00000010 +#define TXX9_DMA_CSR_CFERR 0x00000008 +#define TXX9_DMA_CSR_CHERR 0x00000004 +#define TXX9_DMA_CSR_DESERR 0x00000002 +#define TXX9_DMA_CSR_SORERR 0x00000001 + +struct txx9dmac_chan { + struct dma_chan chan; + struct dma_device dma; + struct txx9dmac_dev *ddev; + void __iomem *ch_regs; + struct tasklet_struct tasklet; + int irq; + u32 ccr; + + spinlock_t lock; + + /* these other elements are all protected by lock */ + struct list_head active_list; + struct list_head queue; + struct list_head free_list; + + unsigned int descs_allocated; +}; + +struct txx9dmac_dev { + void __iomem *regs; + struct tasklet_struct tasklet; + int irq; + struct txx9dmac_chan *chan[TXX9_DMA_MAX_NR_CHANNELS]; + bool have_64bit_regs; + unsigned int descsize; +}; + +static inline bool __is_dmac64(const struct txx9dmac_dev *ddev) +{ + return ddev->have_64bit_regs; +} + +static inline bool is_dmac64(const struct txx9dmac_chan *dc) +{ + return __is_dmac64(dc->ddev); +} + +#ifdef TXX9_DMA_USE_SIMPLE_CHAIN +/* Hardware descriptor definition. (for simple-chain) */ +struct txx9dmac_hwdesc { +#if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) + TXX9_DMA_REG32(CHAR); +#else + u64 CHAR; +#endif + u64 SAR; + u64 DAR; + TXX9_DMA_REG32(CNTR); +}; +struct txx9dmac_hwdesc32 { + u32 CHAR; + u32 SAR; + u32 DAR; + u32 CNTR; +}; +#else +#define txx9dmac_hwdesc txx9dmac_cregs +#define txx9dmac_hwdesc32 txx9dmac_cregs32 +#endif + +struct txx9dmac_desc { + /* FIRST values the hardware uses */ + union { + struct txx9dmac_hwdesc hwdesc; + struct txx9dmac_hwdesc32 hwdesc32; + }; + + /* THEN values for driver housekeeping */ + struct list_head desc_node ____cacheline_aligned; + struct list_head tx_list; + struct dma_async_tx_descriptor txd; + size_t len; +}; + +#ifdef TXX9_DMA_USE_SIMPLE_CHAIN + +static inline bool txx9dmac_chan_INTENT(struct txx9dmac_chan *dc) +{ + return (dc->ccr & TXX9_DMA_CCR_INTENT) != 0; +} + +static inline void txx9dmac_chan_set_INTENT(struct txx9dmac_chan *dc) +{ + dc->ccr |= TXX9_DMA_CCR_INTENT; +} + +static inline void txx9dmac_desc_set_INTENT(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc) +{ +} + +static inline void txx9dmac_chan_set_SMPCHN(struct txx9dmac_chan *dc) +{ + dc->ccr |= TXX9_DMA_CCR_SMPCHN; +} + +static inline void txx9dmac_desc_set_nosimple(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc, + u32 sair, u32 dair, u32 ccr) +{ +} + +#else /* TXX9_DMA_USE_SIMPLE_CHAIN */ + +static inline bool txx9dmac_chan_INTENT(struct txx9dmac_chan *dc) +{ + return true; +} + +static void txx9dmac_chan_set_INTENT(struct txx9dmac_chan *dc) +{ +} + +static inline void txx9dmac_desc_set_INTENT(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc) +{ + if (__is_dmac64(ddev)) + desc->hwdesc.CCR |= TXX9_DMA_CCR_INTENT; + else + desc->hwdesc32.CCR |= TXX9_DMA_CCR_INTENT; +} + +static inline void txx9dmac_chan_set_SMPCHN(struct txx9dmac_chan *dc) +{ +} + +static inline void txx9dmac_desc_set_nosimple(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc, + u32 sai, u32 dai, u32 ccr) +{ + if (__is_dmac64(ddev)) { + desc->hwdesc.SAIR = sai; + desc->hwdesc.DAIR = dai; + desc->hwdesc.CCR = ccr; + } else { + desc->hwdesc32.SAIR = sai; + desc->hwdesc32.DAIR = dai; + desc->hwdesc32.CCR = ccr; + } +} + +#endif /* TXX9_DMA_USE_SIMPLE_CHAIN */ + +#endif /* TXX9DMAC_H */ diff --git a/drivers/dma/virt-dma.c b/drivers/dma/virt-dma.c new file mode 100644 index 000000000..6f80432a3 --- /dev/null +++ b/drivers/dma/virt-dma.c @@ -0,0 +1,123 @@ +/* + * Virtual DMA channel support for DMAengine + * + * Copyright (C) 2012 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/device.h> +#include <linux/dmaengine.h> +#include <linux/module.h> +#include <linux/spinlock.h> + +#include "virt-dma.h" + +static struct virt_dma_desc *to_virt_desc(struct dma_async_tx_descriptor *tx) +{ + return container_of(tx, struct virt_dma_desc, tx); +} + +dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct virt_dma_chan *vc = to_virt_chan(tx->chan); + struct virt_dma_desc *vd = to_virt_desc(tx); + unsigned long flags; + dma_cookie_t cookie; + + spin_lock_irqsave(&vc->lock, flags); + cookie = dma_cookie_assign(tx); + + list_add_tail(&vd->node, &vc->desc_submitted); + spin_unlock_irqrestore(&vc->lock, flags); + + dev_dbg(vc->chan.device->dev, "vchan %p: txd %p[%x]: submitted\n", + vc, vd, cookie); + + return cookie; +} +EXPORT_SYMBOL_GPL(vchan_tx_submit); + +struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *vc, + dma_cookie_t cookie) +{ + struct virt_dma_desc *vd; + + list_for_each_entry(vd, &vc->desc_issued, node) + if (vd->tx.cookie == cookie) + return vd; + + return NULL; +} +EXPORT_SYMBOL_GPL(vchan_find_desc); + +/* + * This tasklet handles the completion of a DMA descriptor by + * calling its callback and freeing it. + */ +static void vchan_complete(unsigned long arg) +{ + struct virt_dma_chan *vc = (struct virt_dma_chan *)arg; + struct virt_dma_desc *vd; + dma_async_tx_callback cb = NULL; + void *cb_data = NULL; + LIST_HEAD(head); + + spin_lock_irq(&vc->lock); + list_splice_tail_init(&vc->desc_completed, &head); + vd = vc->cyclic; + if (vd) { + vc->cyclic = NULL; + cb = vd->tx.callback; + cb_data = vd->tx.callback_param; + } + spin_unlock_irq(&vc->lock); + + if (cb) + cb(cb_data); + + while (!list_empty(&head)) { + vd = list_first_entry(&head, struct virt_dma_desc, node); + cb = vd->tx.callback; + cb_data = vd->tx.callback_param; + + list_del(&vd->node); + + vc->desc_free(vd); + + if (cb) + cb(cb_data); + } +} + +void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head) +{ + while (!list_empty(head)) { + struct virt_dma_desc *vd = list_first_entry(head, + struct virt_dma_desc, node); + list_del(&vd->node); + dev_dbg(vc->chan.device->dev, "txd %p: freeing\n", vd); + vc->desc_free(vd); + } +} +EXPORT_SYMBOL_GPL(vchan_dma_desc_free_list); + +void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev) +{ + dma_cookie_init(&vc->chan); + + spin_lock_init(&vc->lock); + INIT_LIST_HEAD(&vc->desc_submitted); + INIT_LIST_HEAD(&vc->desc_issued); + INIT_LIST_HEAD(&vc->desc_completed); + + tasklet_init(&vc->task, vchan_complete, (unsigned long)vc); + + vc->chan.device = dmadev; + list_add_tail(&vc->chan.device_node, &dmadev->channels); +} +EXPORT_SYMBOL_GPL(vchan_init); + +MODULE_AUTHOR("Russell King"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/virt-dma.h b/drivers/dma/virt-dma.h new file mode 100644 index 000000000..181b95267 --- /dev/null +++ b/drivers/dma/virt-dma.h @@ -0,0 +1,154 @@ +/* + * Virtual DMA channel support for DMAengine + * + * Copyright (C) 2012 Russell King + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#ifndef VIRT_DMA_H +#define VIRT_DMA_H + +#include <linux/dmaengine.h> +#include <linux/interrupt.h> + +#include "dmaengine.h" + +struct virt_dma_desc { + struct dma_async_tx_descriptor tx; + /* protected by vc.lock */ + struct list_head node; +}; + +struct virt_dma_chan { + struct dma_chan chan; + struct tasklet_struct task; + void (*desc_free)(struct virt_dma_desc *); + + spinlock_t lock; + + /* protected by vc.lock */ + struct list_head desc_submitted; + struct list_head desc_issued; + struct list_head desc_completed; + + struct virt_dma_desc *cyclic; +}; + +static inline struct virt_dma_chan *to_virt_chan(struct dma_chan *chan) +{ + return container_of(chan, struct virt_dma_chan, chan); +} + +void vchan_dma_desc_free_list(struct virt_dma_chan *vc, struct list_head *head); +void vchan_init(struct virt_dma_chan *vc, struct dma_device *dmadev); +struct virt_dma_desc *vchan_find_desc(struct virt_dma_chan *, dma_cookie_t); + +/** + * vchan_tx_prep - prepare a descriptor + * vc: virtual channel allocating this descriptor + * vd: virtual descriptor to prepare + * tx_flags: flags argument passed in to prepare function + */ +static inline struct dma_async_tx_descriptor *vchan_tx_prep(struct virt_dma_chan *vc, + struct virt_dma_desc *vd, unsigned long tx_flags) +{ + extern dma_cookie_t vchan_tx_submit(struct dma_async_tx_descriptor *); + + dma_async_tx_descriptor_init(&vd->tx, &vc->chan); + vd->tx.flags = tx_flags; + vd->tx.tx_submit = vchan_tx_submit; + + return &vd->tx; +} + +/** + * vchan_issue_pending - move submitted descriptors to issued list + * vc: virtual channel to update + * + * vc.lock must be held by caller + */ +static inline bool vchan_issue_pending(struct virt_dma_chan *vc) +{ + list_splice_tail_init(&vc->desc_submitted, &vc->desc_issued); + return !list_empty(&vc->desc_issued); +} + +/** + * vchan_cookie_complete - report completion of a descriptor + * vd: virtual descriptor to update + * + * vc.lock must be held by caller + */ +static inline void vchan_cookie_complete(struct virt_dma_desc *vd) +{ + struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan); + dma_cookie_t cookie; + + cookie = vd->tx.cookie; + dma_cookie_complete(&vd->tx); + dev_vdbg(vc->chan.device->dev, "txd %p[%x]: marked complete\n", + vd, cookie); + list_add_tail(&vd->node, &vc->desc_completed); + + tasklet_schedule(&vc->task); +} + +/** + * vchan_cyclic_callback - report the completion of a period + * vd: virtual descriptor + */ +static inline void vchan_cyclic_callback(struct virt_dma_desc *vd) +{ + struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan); + + vc->cyclic = vd; + tasklet_schedule(&vc->task); +} + +/** + * vchan_next_desc - peek at the next descriptor to be processed + * vc: virtual channel to obtain descriptor from + * + * vc.lock must be held by caller + */ +static inline struct virt_dma_desc *vchan_next_desc(struct virt_dma_chan *vc) +{ + if (list_empty(&vc->desc_issued)) + return NULL; + + return list_first_entry(&vc->desc_issued, struct virt_dma_desc, node); +} + +/** + * vchan_get_all_descriptors - obtain all submitted and issued descriptors + * vc: virtual channel to get descriptors from + * head: list of descriptors found + * + * vc.lock must be held by caller + * + * Removes all submitted and issued descriptors from internal lists, and + * provides a list of all descriptors found + */ +static inline void vchan_get_all_descriptors(struct virt_dma_chan *vc, + struct list_head *head) +{ + list_splice_tail_init(&vc->desc_submitted, head); + list_splice_tail_init(&vc->desc_issued, head); + list_splice_tail_init(&vc->desc_completed, head); +} + +static inline void vchan_free_chan_resources(struct virt_dma_chan *vc) +{ + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&vc->lock, flags); + vchan_get_all_descriptors(vc, &head); + spin_unlock_irqrestore(&vc->lock, flags); + + vchan_dma_desc_free_list(vc, &head); +} + +#endif diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c new file mode 100755 index 000000000..f52e37502 --- /dev/null +++ b/drivers/dma/xgene-dma.c @@ -0,0 +1,2089 @@ +/* + * Applied Micro X-Gene SoC DMA engine Driver + * + * Copyright (c) 2015, Applied Micro Circuits Corporation + * Authors: Rameshwar Prasad Sahu <rsahu@apm.com> + * Loc Ho <lho@apm.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * NOTE: PM support is currently not available. + */ + +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_device.h> + +#include "dmaengine.h" + +/* X-Gene DMA ring csr registers and bit definations */ +#define XGENE_DMA_RING_CONFIG 0x04 +#define XGENE_DMA_RING_ENABLE BIT(31) +#define XGENE_DMA_RING_ID 0x08 +#define XGENE_DMA_RING_ID_SETUP(v) ((v) | BIT(31)) +#define XGENE_DMA_RING_ID_BUF 0x0C +#define XGENE_DMA_RING_ID_BUF_SETUP(v) (((v) << 9) | BIT(21)) +#define XGENE_DMA_RING_THRESLD0_SET1 0x30 +#define XGENE_DMA_RING_THRESLD0_SET1_VAL 0X64 +#define XGENE_DMA_RING_THRESLD1_SET1 0x34 +#define XGENE_DMA_RING_THRESLD1_SET1_VAL 0xC8 +#define XGENE_DMA_RING_HYSTERESIS 0x68 +#define XGENE_DMA_RING_HYSTERESIS_VAL 0xFFFFFFFF +#define XGENE_DMA_RING_STATE 0x6C +#define XGENE_DMA_RING_STATE_WR_BASE 0x70 +#define XGENE_DMA_RING_NE_INT_MODE 0x017C +#define XGENE_DMA_RING_NE_INT_MODE_SET(m, v) \ + ((m) = ((m) & ~BIT(31 - (v))) | BIT(31 - (v))) +#define XGENE_DMA_RING_NE_INT_MODE_RESET(m, v) \ + ((m) &= (~BIT(31 - (v)))) +#define XGENE_DMA_RING_CLKEN 0xC208 +#define XGENE_DMA_RING_SRST 0xC200 +#define XGENE_DMA_RING_MEM_RAM_SHUTDOWN 0xD070 +#define XGENE_DMA_RING_BLK_MEM_RDY 0xD074 +#define XGENE_DMA_RING_BLK_MEM_RDY_VAL 0xFFFFFFFF +#define XGENE_DMA_RING_DESC_CNT(v) (((v) & 0x0001FFFE) >> 1) +#define XGENE_DMA_RING_ID_GET(owner, num) (((owner) << 6) | (num)) +#define XGENE_DMA_RING_DST_ID(v) ((1 << 10) | (v)) +#define XGENE_DMA_RING_CMD_OFFSET 0x2C +#define XGENE_DMA_RING_CMD_BASE_OFFSET(v) ((v) << 6) +#define XGENE_DMA_RING_COHERENT_SET(m) \ + (((u32 *)(m))[2] |= BIT(4)) +#define XGENE_DMA_RING_ADDRL_SET(m, v) \ + (((u32 *)(m))[2] |= (((v) >> 8) << 5)) +#define XGENE_DMA_RING_ADDRH_SET(m, v) \ + (((u32 *)(m))[3] |= ((v) >> 35)) +#define XGENE_DMA_RING_ACCEPTLERR_SET(m) \ + (((u32 *)(m))[3] |= BIT(19)) +#define XGENE_DMA_RING_SIZE_SET(m, v) \ + (((u32 *)(m))[3] |= ((v) << 23)) +#define XGENE_DMA_RING_RECOMBBUF_SET(m) \ + (((u32 *)(m))[3] |= BIT(27)) +#define XGENE_DMA_RING_RECOMTIMEOUTL_SET(m) \ + (((u32 *)(m))[3] |= (0x7 << 28)) +#define XGENE_DMA_RING_RECOMTIMEOUTH_SET(m) \ + (((u32 *)(m))[4] |= 0x3) +#define XGENE_DMA_RING_SELTHRSH_SET(m) \ + (((u32 *)(m))[4] |= BIT(3)) +#define XGENE_DMA_RING_TYPE_SET(m, v) \ + (((u32 *)(m))[4] |= ((v) << 19)) + +/* X-Gene DMA device csr registers and bit definitions */ +#define XGENE_DMA_IPBRR 0x0 +#define XGENE_DMA_DEV_ID_RD(v) ((v) & 0x00000FFF) +#define XGENE_DMA_BUS_ID_RD(v) (((v) >> 12) & 3) +#define XGENE_DMA_REV_NO_RD(v) (((v) >> 14) & 3) +#define XGENE_DMA_GCR 0x10 +#define XGENE_DMA_CH_SETUP(v) \ + ((v) = ((v) & ~0x000FFFFF) | 0x000AAFFF) +#define XGENE_DMA_ENABLE(v) ((v) |= BIT(31)) +#define XGENE_DMA_DISABLE(v) ((v) &= ~BIT(31)) +#define XGENE_DMA_RAID6_CONT 0x14 +#define XGENE_DMA_RAID6_MULTI_CTRL(v) ((v) << 24) +#define XGENE_DMA_INT 0x70 +#define XGENE_DMA_INT_MASK 0x74 +#define XGENE_DMA_INT_ALL_MASK 0xFFFFFFFF +#define XGENE_DMA_INT_ALL_UNMASK 0x0 +#define XGENE_DMA_INT_MASK_SHIFT 0x14 +#define XGENE_DMA_RING_INT0_MASK 0x90A0 +#define XGENE_DMA_RING_INT1_MASK 0x90A8 +#define XGENE_DMA_RING_INT2_MASK 0x90B0 +#define XGENE_DMA_RING_INT3_MASK 0x90B8 +#define XGENE_DMA_RING_INT4_MASK 0x90C0 +#define XGENE_DMA_CFG_RING_WQ_ASSOC 0x90E0 +#define XGENE_DMA_ASSOC_RING_MNGR1 0xFFFFFFFF +#define XGENE_DMA_MEM_RAM_SHUTDOWN 0xD070 +#define XGENE_DMA_BLK_MEM_RDY 0xD074 +#define XGENE_DMA_BLK_MEM_RDY_VAL 0xFFFFFFFF + +/* X-Gene SoC EFUSE csr register and bit defination */ +#define XGENE_SOC_JTAG1_SHADOW 0x18 +#define XGENE_DMA_PQ_DISABLE_MASK BIT(13) + +/* X-Gene DMA Descriptor format */ +#define XGENE_DMA_DESC_NV_BIT BIT_ULL(50) +#define XGENE_DMA_DESC_IN_BIT BIT_ULL(55) +#define XGENE_DMA_DESC_C_BIT BIT_ULL(63) +#define XGENE_DMA_DESC_DR_BIT BIT_ULL(61) +#define XGENE_DMA_DESC_ELERR_POS 46 +#define XGENE_DMA_DESC_RTYPE_POS 56 +#define XGENE_DMA_DESC_LERR_POS 60 +#define XGENE_DMA_DESC_FLYBY_POS 4 +#define XGENE_DMA_DESC_BUFLEN_POS 48 +#define XGENE_DMA_DESC_HOENQ_NUM_POS 48 + +#define XGENE_DMA_DESC_NV_SET(m) \ + (((u64 *)(m))[0] |= XGENE_DMA_DESC_NV_BIT) +#define XGENE_DMA_DESC_IN_SET(m) \ + (((u64 *)(m))[0] |= XGENE_DMA_DESC_IN_BIT) +#define XGENE_DMA_DESC_RTYPE_SET(m, v) \ + (((u64 *)(m))[0] |= ((u64)(v) << XGENE_DMA_DESC_RTYPE_POS)) +#define XGENE_DMA_DESC_BUFADDR_SET(m, v) \ + (((u64 *)(m))[0] |= (v)) +#define XGENE_DMA_DESC_BUFLEN_SET(m, v) \ + (((u64 *)(m))[0] |= ((u64)(v) << XGENE_DMA_DESC_BUFLEN_POS)) +#define XGENE_DMA_DESC_C_SET(m) \ + (((u64 *)(m))[1] |= XGENE_DMA_DESC_C_BIT) +#define XGENE_DMA_DESC_FLYBY_SET(m, v) \ + (((u64 *)(m))[2] |= ((v) << XGENE_DMA_DESC_FLYBY_POS)) +#define XGENE_DMA_DESC_MULTI_SET(m, v, i) \ + (((u64 *)(m))[2] |= ((u64)(v) << (((i) + 1) * 8))) +#define XGENE_DMA_DESC_DR_SET(m) \ + (((u64 *)(m))[2] |= XGENE_DMA_DESC_DR_BIT) +#define XGENE_DMA_DESC_DST_ADDR_SET(m, v) \ + (((u64 *)(m))[3] |= (v)) +#define XGENE_DMA_DESC_H0ENQ_NUM_SET(m, v) \ + (((u64 *)(m))[3] |= ((u64)(v) << XGENE_DMA_DESC_HOENQ_NUM_POS)) +#define XGENE_DMA_DESC_ELERR_RD(m) \ + (((m) >> XGENE_DMA_DESC_ELERR_POS) & 0x3) +#define XGENE_DMA_DESC_LERR_RD(m) \ + (((m) >> XGENE_DMA_DESC_LERR_POS) & 0x7) +#define XGENE_DMA_DESC_STATUS(elerr, lerr) \ + (((elerr) << 4) | (lerr)) + +/* X-Gene DMA descriptor empty s/w signature */ +#define XGENE_DMA_DESC_EMPTY_INDEX 0 +#define XGENE_DMA_DESC_EMPTY_SIGNATURE ~0ULL +#define XGENE_DMA_DESC_SET_EMPTY(m) \ + (((u64 *)(m))[XGENE_DMA_DESC_EMPTY_INDEX] = \ + XGENE_DMA_DESC_EMPTY_SIGNATURE) +#define XGENE_DMA_DESC_IS_EMPTY(m) \ + (((u64 *)(m))[XGENE_DMA_DESC_EMPTY_INDEX] == \ + XGENE_DMA_DESC_EMPTY_SIGNATURE) + +/* X-Gene DMA configurable parameters defines */ +#define XGENE_DMA_RING_NUM 512 +#define XGENE_DMA_BUFNUM 0x0 +#define XGENE_DMA_CPU_BUFNUM 0x18 +#define XGENE_DMA_RING_OWNER_DMA 0x03 +#define XGENE_DMA_RING_OWNER_CPU 0x0F +#define XGENE_DMA_RING_TYPE_REGULAR 0x01 +#define XGENE_DMA_RING_WQ_DESC_SIZE 32 /* 32 Bytes */ +#define XGENE_DMA_RING_NUM_CONFIG 5 +#define XGENE_DMA_MAX_CHANNEL 4 +#define XGENE_DMA_XOR_CHANNEL 0 +#define XGENE_DMA_PQ_CHANNEL 1 +#define XGENE_DMA_MAX_BYTE_CNT 0x4000 /* 16 KB */ +#define XGENE_DMA_MAX_64B_DESC_BYTE_CNT 0x14000 /* 80 KB */ +#define XGENE_DMA_XOR_ALIGNMENT 6 /* 64 Bytes */ +#define XGENE_DMA_MAX_XOR_SRC 5 +#define XGENE_DMA_16K_BUFFER_LEN_CODE 0x0 +#define XGENE_DMA_INVALID_LEN_CODE 0x7800 + +/* X-Gene DMA descriptor error codes */ +#define ERR_DESC_AXI 0x01 +#define ERR_BAD_DESC 0x02 +#define ERR_READ_DATA_AXI 0x03 +#define ERR_WRITE_DATA_AXI 0x04 +#define ERR_FBP_TIMEOUT 0x05 +#define ERR_ECC 0x06 +#define ERR_DIFF_SIZE 0x08 +#define ERR_SCT_GAT_LEN 0x09 +#define ERR_CRC_ERR 0x11 +#define ERR_CHKSUM 0x12 +#define ERR_DIF 0x13 + +/* X-Gene DMA error interrupt codes */ +#define ERR_DIF_SIZE_INT 0x0 +#define ERR_GS_ERR_INT 0x1 +#define ERR_FPB_TIMEO_INT 0x2 +#define ERR_WFIFO_OVF_INT 0x3 +#define ERR_RFIFO_OVF_INT 0x4 +#define ERR_WR_TIMEO_INT 0x5 +#define ERR_RD_TIMEO_INT 0x6 +#define ERR_WR_ERR_INT 0x7 +#define ERR_RD_ERR_INT 0x8 +#define ERR_BAD_DESC_INT 0x9 +#define ERR_DESC_DST_INT 0xA +#define ERR_DESC_SRC_INT 0xB + +/* X-Gene DMA flyby operation code */ +#define FLYBY_2SRC_XOR 0x8 +#define FLYBY_3SRC_XOR 0x9 +#define FLYBY_4SRC_XOR 0xA +#define FLYBY_5SRC_XOR 0xB + +/* X-Gene DMA SW descriptor flags */ +#define XGENE_DMA_FLAG_64B_DESC BIT(0) + +/* Define to dump X-Gene DMA descriptor */ +#define XGENE_DMA_DESC_DUMP(desc, m) \ + print_hex_dump(KERN_ERR, (m), \ + DUMP_PREFIX_ADDRESS, 16, 8, (desc), 32, 0) + +#define to_dma_desc_sw(tx) \ + container_of(tx, struct xgene_dma_desc_sw, tx) +#define to_dma_chan(dchan) \ + container_of(dchan, struct xgene_dma_chan, dma_chan) + +#define chan_dbg(chan, fmt, arg...) \ + dev_dbg(chan->dev, "%s: " fmt, chan->name, ##arg) +#define chan_err(chan, fmt, arg...) \ + dev_err(chan->dev, "%s: " fmt, chan->name, ##arg) + +struct xgene_dma_desc_hw { + u64 m0; + u64 m1; + u64 m2; + u64 m3; +}; + +enum xgene_dma_ring_cfgsize { + XGENE_DMA_RING_CFG_SIZE_512B, + XGENE_DMA_RING_CFG_SIZE_2KB, + XGENE_DMA_RING_CFG_SIZE_16KB, + XGENE_DMA_RING_CFG_SIZE_64KB, + XGENE_DMA_RING_CFG_SIZE_512KB, + XGENE_DMA_RING_CFG_SIZE_INVALID +}; + +struct xgene_dma_ring { + struct xgene_dma *pdma; + u8 buf_num; + u16 id; + u16 num; + u16 head; + u16 owner; + u16 slots; + u16 dst_ring_num; + u32 size; + void __iomem *cmd; + void __iomem *cmd_base; + dma_addr_t desc_paddr; + u32 state[XGENE_DMA_RING_NUM_CONFIG]; + enum xgene_dma_ring_cfgsize cfgsize; + union { + void *desc_vaddr; + struct xgene_dma_desc_hw *desc_hw; + }; +}; + +struct xgene_dma_desc_sw { + struct xgene_dma_desc_hw desc1; + struct xgene_dma_desc_hw desc2; + u32 flags; + struct list_head node; + struct list_head tx_list; + struct dma_async_tx_descriptor tx; +}; + +/** + * struct xgene_dma_chan - internal representation of an X-Gene DMA channel + * @dma_chan: dmaengine channel object member + * @pdma: X-Gene DMA device structure reference + * @dev: struct device reference for dma mapping api + * @id: raw id of this channel + * @rx_irq: channel IRQ + * @name: name of X-Gene DMA channel + * @lock: serializes enqueue/dequeue operations to the descriptor pool + * @pending: number of transaction request pushed to DMA controller for + * execution, but still waiting for completion, + * @max_outstanding: max number of outstanding request we can push to channel + * @ld_pending: descriptors which are queued to run, but have not yet been + * submitted to the hardware for execution + * @ld_running: descriptors which are currently being executing by the hardware + * @ld_completed: descriptors which have finished execution by the hardware. + * These descriptors have already had their cleanup actions run. They + * are waiting for the ACK bit to be set by the async tx API. + * @desc_pool: descriptor pool for DMA operations + * @tasklet: bottom half where all completed descriptors cleans + * @tx_ring: transmit ring descriptor that we use to prepare actual + * descriptors for further executions + * @rx_ring: receive ring descriptor that we use to get completed DMA + * descriptors during cleanup time + */ +struct xgene_dma_chan { + struct dma_chan dma_chan; + struct xgene_dma *pdma; + struct device *dev; + int id; + int rx_irq; + char name[10]; + spinlock_t lock; + int pending; + int max_outstanding; + struct list_head ld_pending; + struct list_head ld_running; + struct list_head ld_completed; + struct dma_pool *desc_pool; + struct tasklet_struct tasklet; + struct xgene_dma_ring tx_ring; + struct xgene_dma_ring rx_ring; +}; + +/** + * struct xgene_dma - internal representation of an X-Gene DMA device + * @err_irq: DMA error irq number + * @ring_num: start id number for DMA ring + * @csr_dma: base for DMA register access + * @csr_ring: base for DMA ring register access + * @csr_ring_cmd: base for DMA ring command register access + * @csr_efuse: base for efuse register access + * @dma_dev: embedded struct dma_device + * @chan: reference to X-Gene DMA channels + */ +struct xgene_dma { + struct device *dev; + struct clk *clk; + int err_irq; + int ring_num; + void __iomem *csr_dma; + void __iomem *csr_ring; + void __iomem *csr_ring_cmd; + void __iomem *csr_efuse; + struct dma_device dma_dev[XGENE_DMA_MAX_CHANNEL]; + struct xgene_dma_chan chan[XGENE_DMA_MAX_CHANNEL]; +}; + +static const char * const xgene_dma_desc_err[] = { + [ERR_DESC_AXI] = "AXI error when reading src/dst link list", + [ERR_BAD_DESC] = "ERR or El_ERR fields not set to zero in desc", + [ERR_READ_DATA_AXI] = "AXI error when reading data", + [ERR_WRITE_DATA_AXI] = "AXI error when writing data", + [ERR_FBP_TIMEOUT] = "Timeout on bufpool fetch", + [ERR_ECC] = "ECC double bit error", + [ERR_DIFF_SIZE] = "Bufpool too small to hold all the DIF result", + [ERR_SCT_GAT_LEN] = "Gather and scatter data length not same", + [ERR_CRC_ERR] = "CRC error", + [ERR_CHKSUM] = "Checksum error", + [ERR_DIF] = "DIF error", +}; + +static const char * const xgene_dma_err[] = { + [ERR_DIF_SIZE_INT] = "DIF size error", + [ERR_GS_ERR_INT] = "Gather scatter not same size error", + [ERR_FPB_TIMEO_INT] = "Free pool time out error", + [ERR_WFIFO_OVF_INT] = "Write FIFO over flow error", + [ERR_RFIFO_OVF_INT] = "Read FIFO over flow error", + [ERR_WR_TIMEO_INT] = "Write time out error", + [ERR_RD_TIMEO_INT] = "Read time out error", + [ERR_WR_ERR_INT] = "HBF bus write error", + [ERR_RD_ERR_INT] = "HBF bus read error", + [ERR_BAD_DESC_INT] = "Ring descriptor HE0 not set error", + [ERR_DESC_DST_INT] = "HFB reading dst link address error", + [ERR_DESC_SRC_INT] = "HFB reading src link address error", +}; + +static bool is_pq_enabled(struct xgene_dma *pdma) +{ + u32 val; + + val = ioread32(pdma->csr_efuse + XGENE_SOC_JTAG1_SHADOW); + return !(val & XGENE_DMA_PQ_DISABLE_MASK); +} + +static void xgene_dma_cpu_to_le64(u64 *desc, int count) +{ + int i; + + for (i = 0; i < count; i++) + desc[i] = cpu_to_le64(desc[i]); +} + +static u16 xgene_dma_encode_len(u32 len) +{ + return (len < XGENE_DMA_MAX_BYTE_CNT) ? + len : XGENE_DMA_16K_BUFFER_LEN_CODE; +} + +static u8 xgene_dma_encode_xor_flyby(u32 src_cnt) +{ + static u8 flyby_type[] = { + FLYBY_2SRC_XOR, /* Dummy */ + FLYBY_2SRC_XOR, /* Dummy */ + FLYBY_2SRC_XOR, + FLYBY_3SRC_XOR, + FLYBY_4SRC_XOR, + FLYBY_5SRC_XOR + }; + + return flyby_type[src_cnt]; +} + +static u32 xgene_dma_ring_desc_cnt(struct xgene_dma_ring *ring) +{ + u32 __iomem *cmd_base = ring->cmd_base; + u32 ring_state = ioread32(&cmd_base[1]); + + return XGENE_DMA_RING_DESC_CNT(ring_state); +} + +static void xgene_dma_set_src_buffer(void *ext8, size_t *len, + dma_addr_t *paddr) +{ + size_t nbytes = (*len < XGENE_DMA_MAX_BYTE_CNT) ? + *len : XGENE_DMA_MAX_BYTE_CNT; + + XGENE_DMA_DESC_BUFADDR_SET(ext8, *paddr); + XGENE_DMA_DESC_BUFLEN_SET(ext8, xgene_dma_encode_len(nbytes)); + *len -= nbytes; + *paddr += nbytes; +} + +static void xgene_dma_invalidate_buffer(void *ext8) +{ + XGENE_DMA_DESC_BUFLEN_SET(ext8, XGENE_DMA_INVALID_LEN_CODE); +} + +static void *xgene_dma_lookup_ext8(u64 *desc, int idx) +{ + return (idx % 2) ? (desc + idx - 1) : (desc + idx + 1); +} + +static void xgene_dma_init_desc(void *desc, u16 dst_ring_num) +{ + XGENE_DMA_DESC_C_SET(desc); /* Coherent IO */ + XGENE_DMA_DESC_IN_SET(desc); + XGENE_DMA_DESC_H0ENQ_NUM_SET(desc, dst_ring_num); + XGENE_DMA_DESC_RTYPE_SET(desc, XGENE_DMA_RING_OWNER_DMA); +} + +static void xgene_dma_prep_cpy_desc(struct xgene_dma_chan *chan, + struct xgene_dma_desc_sw *desc_sw, + dma_addr_t dst, dma_addr_t src, + size_t len) +{ + void *desc1, *desc2; + int i; + + /* Get 1st descriptor */ + desc1 = &desc_sw->desc1; + xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num); + + /* Set destination address */ + XGENE_DMA_DESC_DR_SET(desc1); + XGENE_DMA_DESC_DST_ADDR_SET(desc1, dst); + + /* Set 1st source address */ + xgene_dma_set_src_buffer(desc1 + 8, &len, &src); + + if (len <= 0) { + desc2 = NULL; + goto skip_additional_src; + } + + /* + * We need to split this source buffer, + * and need to use 2nd descriptor + */ + desc2 = &desc_sw->desc2; + XGENE_DMA_DESC_NV_SET(desc1); + + /* Set 2nd to 5th source address */ + for (i = 0; i < 4 && len; i++) + xgene_dma_set_src_buffer(xgene_dma_lookup_ext8(desc2, i), + &len, &src); + + /* Invalidate unused source address field */ + for (; i < 4; i++) + xgene_dma_invalidate_buffer(xgene_dma_lookup_ext8(desc2, i)); + + /* Updated flag that we have prepared 64B descriptor */ + desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC; + +skip_additional_src: + /* Hardware stores descriptor in little endian format */ + xgene_dma_cpu_to_le64(desc1, 4); + if (desc2) + xgene_dma_cpu_to_le64(desc2, 4); +} + +static void xgene_dma_prep_xor_desc(struct xgene_dma_chan *chan, + struct xgene_dma_desc_sw *desc_sw, + dma_addr_t *dst, dma_addr_t *src, + u32 src_cnt, size_t *nbytes, + const u8 *scf) +{ + void *desc1, *desc2; + size_t len = *nbytes; + int i; + + desc1 = &desc_sw->desc1; + desc2 = &desc_sw->desc2; + + /* Initialize DMA descriptor */ + xgene_dma_init_desc(desc1, chan->tx_ring.dst_ring_num); + + /* Set destination address */ + XGENE_DMA_DESC_DR_SET(desc1); + XGENE_DMA_DESC_DST_ADDR_SET(desc1, *dst); + + /* We have multiple source addresses, so need to set NV bit*/ + XGENE_DMA_DESC_NV_SET(desc1); + + /* Set flyby opcode */ + XGENE_DMA_DESC_FLYBY_SET(desc1, xgene_dma_encode_xor_flyby(src_cnt)); + + /* Set 1st to 5th source addresses */ + for (i = 0; i < src_cnt; i++) { + len = *nbytes; + xgene_dma_set_src_buffer((i == 0) ? (desc1 + 8) : + xgene_dma_lookup_ext8(desc2, i - 1), + &len, &src[i]); + XGENE_DMA_DESC_MULTI_SET(desc1, scf[i], i); + } + + /* Hardware stores descriptor in little endian format */ + xgene_dma_cpu_to_le64(desc1, 4); + xgene_dma_cpu_to_le64(desc2, 4); + + /* Update meta data */ + *nbytes = len; + *dst += XGENE_DMA_MAX_BYTE_CNT; + + /* We need always 64B descriptor to perform xor or pq operations */ + desc_sw->flags |= XGENE_DMA_FLAG_64B_DESC; +} + +static dma_cookie_t xgene_dma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct xgene_dma_desc_sw *desc; + struct xgene_dma_chan *chan; + dma_cookie_t cookie; + + if (unlikely(!tx)) + return -EINVAL; + + chan = to_dma_chan(tx->chan); + desc = to_dma_desc_sw(tx); + + spin_lock_bh(&chan->lock); + + cookie = dma_cookie_assign(tx); + + /* Add this transaction list onto the tail of the pending queue */ + list_splice_tail_init(&desc->tx_list, &chan->ld_pending); + + spin_unlock_bh(&chan->lock); + + return cookie; +} + +static void xgene_dma_clean_descriptor(struct xgene_dma_chan *chan, + struct xgene_dma_desc_sw *desc) +{ + list_del(&desc->node); + chan_dbg(chan, "LD %p free\n", desc); + dma_pool_free(chan->desc_pool, desc, desc->tx.phys); +} + +static struct xgene_dma_desc_sw *xgene_dma_alloc_descriptor( + struct xgene_dma_chan *chan) +{ + struct xgene_dma_desc_sw *desc; + dma_addr_t phys; + + desc = dma_pool_alloc(chan->desc_pool, GFP_NOWAIT, &phys); + if (!desc) { + chan_err(chan, "Failed to allocate LDs\n"); + return NULL; + } + + memset(desc, 0, sizeof(*desc)); + + INIT_LIST_HEAD(&desc->tx_list); + desc->tx.phys = phys; + desc->tx.tx_submit = xgene_dma_tx_submit; + dma_async_tx_descriptor_init(&desc->tx, &chan->dma_chan); + + chan_dbg(chan, "LD %p allocated\n", desc); + + return desc; +} + +/** + * xgene_dma_clean_completed_descriptor - free all descriptors which + * has been completed and acked + * @chan: X-Gene DMA channel + * + * This function is used on all completed and acked descriptors. + */ +static void xgene_dma_clean_completed_descriptor(struct xgene_dma_chan *chan) +{ + struct xgene_dma_desc_sw *desc, *_desc; + + /* Run the callback for each descriptor, in order */ + list_for_each_entry_safe(desc, _desc, &chan->ld_completed, node) { + if (async_tx_test_ack(&desc->tx)) + xgene_dma_clean_descriptor(chan, desc); + } +} + +/** + * xgene_dma_run_tx_complete_actions - cleanup a single link descriptor + * @chan: X-Gene DMA channel + * @desc: descriptor to cleanup and free + * + * This function is used on a descriptor which has been executed by the DMA + * controller. It will run any callbacks, submit any dependencies. + */ +static void xgene_dma_run_tx_complete_actions(struct xgene_dma_chan *chan, + struct xgene_dma_desc_sw *desc) +{ + struct dma_async_tx_descriptor *tx = &desc->tx; + + /* + * If this is not the last transaction in the group, + * then no need to complete cookie and run any callback as + * this is not the tx_descriptor which had been sent to caller + * of this DMA request + */ + + if (tx->cookie == 0) + return; + + dma_cookie_complete(tx); + + /* Run the link descriptor callback function */ + if (tx->callback) + tx->callback(tx->callback_param); + + dma_descriptor_unmap(tx); + + /* Run any dependencies */ + dma_run_dependencies(tx); +} + +/** + * xgene_dma_clean_running_descriptor - move the completed descriptor from + * ld_running to ld_completed + * @chan: X-Gene DMA channel + * @desc: the descriptor which is completed + * + * Free the descriptor directly if acked by async_tx api, + * else move it to queue ld_completed. + */ +static void xgene_dma_clean_running_descriptor(struct xgene_dma_chan *chan, + struct xgene_dma_desc_sw *desc) +{ + /* Remove from the list of running transactions */ + list_del(&desc->node); + + /* + * the client is allowed to attach dependent operations + * until 'ack' is set + */ + if (!async_tx_test_ack(&desc->tx)) { + /* + * Move this descriptor to the list of descriptors which is + * completed, but still awaiting the 'ack' bit to be set. + */ + list_add_tail(&desc->node, &chan->ld_completed); + return; + } + + chan_dbg(chan, "LD %p free\n", desc); + dma_pool_free(chan->desc_pool, desc, desc->tx.phys); +} + +static int xgene_chan_xfer_request(struct xgene_dma_ring *ring, + struct xgene_dma_desc_sw *desc_sw) +{ + struct xgene_dma_desc_hw *desc_hw; + + /* Check if can push more descriptor to hw for execution */ + if (xgene_dma_ring_desc_cnt(ring) > (ring->slots - 2)) + return -EBUSY; + + /* Get hw descriptor from DMA tx ring */ + desc_hw = &ring->desc_hw[ring->head]; + + /* + * Increment the head count to point next + * descriptor for next time + */ + if (++ring->head == ring->slots) + ring->head = 0; + + /* Copy prepared sw descriptor data to hw descriptor */ + memcpy(desc_hw, &desc_sw->desc1, sizeof(*desc_hw)); + + /* + * Check if we have prepared 64B descriptor, + * in this case we need one more hw descriptor + */ + if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) { + desc_hw = &ring->desc_hw[ring->head]; + + if (++ring->head == ring->slots) + ring->head = 0; + + memcpy(desc_hw, &desc_sw->desc2, sizeof(*desc_hw)); + } + + /* Notify the hw that we have descriptor ready for execution */ + iowrite32((desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) ? + 2 : 1, ring->cmd); + + return 0; +} + +/** + * xgene_chan_xfer_ld_pending - push any pending transactions to hw + * @chan : X-Gene DMA channel + * + * LOCKING: must hold chan->desc_lock + */ +static void xgene_chan_xfer_ld_pending(struct xgene_dma_chan *chan) +{ + struct xgene_dma_desc_sw *desc_sw, *_desc_sw; + int ret; + + /* + * If the list of pending descriptors is empty, then we + * don't need to do any work at all + */ + if (list_empty(&chan->ld_pending)) { + chan_dbg(chan, "No pending LDs\n"); + return; + } + + /* + * Move elements from the queue of pending transactions onto the list + * of running transactions and push it to hw for further executions + */ + list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_pending, node) { + /* + * Check if have pushed max number of transactions to hw + * as capable, so let's stop here and will push remaining + * elements from pening ld queue after completing some + * descriptors that we have already pushed + */ + if (chan->pending >= chan->max_outstanding) + return; + + ret = xgene_chan_xfer_request(&chan->tx_ring, desc_sw); + if (ret) + return; + + /* + * Delete this element from ld pending queue and append it to + * ld running queue + */ + list_move_tail(&desc_sw->node, &chan->ld_running); + + /* Increment the pending transaction count */ + chan->pending++; + } +} + +/** + * xgene_dma_cleanup_descriptors - cleanup link descriptors which are completed + * and move them to ld_completed to free until flag 'ack' is set + * @chan: X-Gene DMA channel + * + * This function is used on descriptors which have been executed by the DMA + * controller. It will run any callbacks, submit any dependencies, then + * free these descriptors if flag 'ack' is set. + */ +static void xgene_dma_cleanup_descriptors(struct xgene_dma_chan *chan) +{ + struct xgene_dma_ring *ring = &chan->rx_ring; + struct xgene_dma_desc_sw *desc_sw, *_desc_sw; + struct xgene_dma_desc_hw *desc_hw; + u8 status; + + /* Clean already completed and acked descriptors */ + xgene_dma_clean_completed_descriptor(chan); + + /* Run the callback for each descriptor, in order */ + list_for_each_entry_safe(desc_sw, _desc_sw, &chan->ld_running, node) { + /* Get subsequent hw descriptor from DMA rx ring */ + desc_hw = &ring->desc_hw[ring->head]; + + /* Check if this descriptor has been completed */ + if (unlikely(XGENE_DMA_DESC_IS_EMPTY(desc_hw))) + break; + + if (++ring->head == ring->slots) + ring->head = 0; + + /* Check if we have any error with DMA transactions */ + status = XGENE_DMA_DESC_STATUS( + XGENE_DMA_DESC_ELERR_RD(le64_to_cpu( + desc_hw->m0)), + XGENE_DMA_DESC_LERR_RD(le64_to_cpu( + desc_hw->m0))); + if (status) { + /* Print the DMA error type */ + chan_err(chan, "%s\n", xgene_dma_desc_err[status]); + + /* + * We have DMA transactions error here. Dump DMA Tx + * and Rx descriptors for this request */ + XGENE_DMA_DESC_DUMP(&desc_sw->desc1, + "X-Gene DMA TX DESC1: "); + + if (desc_sw->flags & XGENE_DMA_FLAG_64B_DESC) + XGENE_DMA_DESC_DUMP(&desc_sw->desc2, + "X-Gene DMA TX DESC2: "); + + XGENE_DMA_DESC_DUMP(desc_hw, + "X-Gene DMA RX ERR DESC: "); + } + + /* Notify the hw about this completed descriptor */ + iowrite32(-1, ring->cmd); + + /* Mark this hw descriptor as processed */ + XGENE_DMA_DESC_SET_EMPTY(desc_hw); + + xgene_dma_run_tx_complete_actions(chan, desc_sw); + + xgene_dma_clean_running_descriptor(chan, desc_sw); + + /* + * Decrement the pending transaction count + * as we have processed one + */ + chan->pending--; + } + + /* + * Start any pending transactions automatically + * In the ideal case, we keep the DMA controller busy while we go + * ahead and free the descriptors below. + */ + xgene_chan_xfer_ld_pending(chan); +} + +static int xgene_dma_alloc_chan_resources(struct dma_chan *dchan) +{ + struct xgene_dma_chan *chan = to_dma_chan(dchan); + + /* Has this channel already been allocated? */ + if (chan->desc_pool) + return 1; + + chan->desc_pool = dma_pool_create(chan->name, chan->dev, + sizeof(struct xgene_dma_desc_sw), + 0, 0); + if (!chan->desc_pool) { + chan_err(chan, "Failed to allocate descriptor pool\n"); + return -ENOMEM; + } + + chan_dbg(chan, "Allocate descripto pool\n"); + + return 1; +} + +/** + * xgene_dma_free_desc_list - Free all descriptors in a queue + * @chan: X-Gene DMA channel + * @list: the list to free + * + * LOCKING: must hold chan->desc_lock + */ +static void xgene_dma_free_desc_list(struct xgene_dma_chan *chan, + struct list_head *list) +{ + struct xgene_dma_desc_sw *desc, *_desc; + + list_for_each_entry_safe(desc, _desc, list, node) + xgene_dma_clean_descriptor(chan, desc); +} + +static void xgene_dma_free_tx_desc_list(struct xgene_dma_chan *chan, + struct list_head *list) +{ + struct xgene_dma_desc_sw *desc, *_desc; + + list_for_each_entry_safe(desc, _desc, list, node) + xgene_dma_clean_descriptor(chan, desc); +} + +static void xgene_dma_free_chan_resources(struct dma_chan *dchan) +{ + struct xgene_dma_chan *chan = to_dma_chan(dchan); + + chan_dbg(chan, "Free all resources\n"); + + if (!chan->desc_pool) + return; + + spin_lock_bh(&chan->lock); + + /* Process all running descriptor */ + xgene_dma_cleanup_descriptors(chan); + + /* Clean all link descriptor queues */ + xgene_dma_free_desc_list(chan, &chan->ld_pending); + xgene_dma_free_desc_list(chan, &chan->ld_running); + xgene_dma_free_desc_list(chan, &chan->ld_completed); + + spin_unlock_bh(&chan->lock); + + /* Delete this channel DMA pool */ + dma_pool_destroy(chan->desc_pool); + chan->desc_pool = NULL; +} + +static struct dma_async_tx_descriptor *xgene_dma_prep_memcpy( + struct dma_chan *dchan, dma_addr_t dst, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct xgene_dma_desc_sw *first = NULL, *new; + struct xgene_dma_chan *chan; + size_t copy; + + if (unlikely(!dchan || !len)) + return NULL; + + chan = to_dma_chan(dchan); + + do { + /* Allocate the link descriptor from DMA pool */ + new = xgene_dma_alloc_descriptor(chan); + if (!new) + goto fail; + + /* Create the largest transaction possible */ + copy = min_t(size_t, len, XGENE_DMA_MAX_64B_DESC_BYTE_CNT); + + /* Prepare DMA descriptor */ + xgene_dma_prep_cpy_desc(chan, new, dst, src, copy); + + if (!first) + first = new; + + new->tx.cookie = 0; + async_tx_ack(&new->tx); + + /* Update metadata */ + len -= copy; + dst += copy; + src += copy; + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + } while (len); + + new->tx.flags = flags; /* client is in control of this ack */ + new->tx.cookie = -EBUSY; + list_splice(&first->tx_list, &new->tx_list); + + return &new->tx; + +fail: + if (!first) + return NULL; + + xgene_dma_free_tx_desc_list(chan, &first->tx_list); + return NULL; +} + +static struct dma_async_tx_descriptor *xgene_dma_prep_sg( + struct dma_chan *dchan, struct scatterlist *dst_sg, + u32 dst_nents, struct scatterlist *src_sg, + u32 src_nents, unsigned long flags) +{ + struct xgene_dma_desc_sw *first = NULL, *new = NULL; + struct xgene_dma_chan *chan; + size_t dst_avail, src_avail; + dma_addr_t dst, src; + size_t len; + + if (unlikely(!dchan)) + return NULL; + + if (unlikely(!dst_nents || !src_nents)) + return NULL; + + if (unlikely(!dst_sg || !src_sg)) + return NULL; + + chan = to_dma_chan(dchan); + + /* Get prepared for the loop */ + dst_avail = sg_dma_len(dst_sg); + src_avail = sg_dma_len(src_sg); + dst_nents--; + src_nents--; + + /* Run until we are out of scatterlist entries */ + while (true) { + /* Create the largest transaction possible */ + len = min_t(size_t, src_avail, dst_avail); + len = min_t(size_t, len, XGENE_DMA_MAX_64B_DESC_BYTE_CNT); + if (len == 0) + goto fetch; + + dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail; + src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail; + + /* Allocate the link descriptor from DMA pool */ + new = xgene_dma_alloc_descriptor(chan); + if (!new) + goto fail; + + /* Prepare DMA descriptor */ + xgene_dma_prep_cpy_desc(chan, new, dst, src, len); + + if (!first) + first = new; + + new->tx.cookie = 0; + async_tx_ack(&new->tx); + + /* update metadata */ + dst_avail -= len; + src_avail -= len; + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + +fetch: + /* fetch the next dst scatterlist entry */ + if (dst_avail == 0) { + /* no more entries: we're done */ + if (dst_nents == 0) + break; + + /* fetch the next entry: if there are no more: done */ + dst_sg = sg_next(dst_sg); + if (!dst_sg) + break; + + dst_nents--; + dst_avail = sg_dma_len(dst_sg); + } + + /* fetch the next src scatterlist entry */ + if (src_avail == 0) { + /* no more entries: we're done */ + if (src_nents == 0) + break; + + /* fetch the next entry: if there are no more: done */ + src_sg = sg_next(src_sg); + if (!src_sg) + break; + + src_nents--; + src_avail = sg_dma_len(src_sg); + } + } + + if (!new) + return NULL; + + new->tx.flags = flags; /* client is in control of this ack */ + new->tx.cookie = -EBUSY; + list_splice(&first->tx_list, &new->tx_list); + + return &new->tx; +fail: + if (!first) + return NULL; + + xgene_dma_free_tx_desc_list(chan, &first->tx_list); + return NULL; +} + +static struct dma_async_tx_descriptor *xgene_dma_prep_xor( + struct dma_chan *dchan, dma_addr_t dst, dma_addr_t *src, + u32 src_cnt, size_t len, unsigned long flags) +{ + struct xgene_dma_desc_sw *first = NULL, *new; + struct xgene_dma_chan *chan; + static u8 multi[XGENE_DMA_MAX_XOR_SRC] = { + 0x01, 0x01, 0x01, 0x01, 0x01}; + + if (unlikely(!dchan || !len)) + return NULL; + + chan = to_dma_chan(dchan); + + do { + /* Allocate the link descriptor from DMA pool */ + new = xgene_dma_alloc_descriptor(chan); + if (!new) + goto fail; + + /* Prepare xor DMA descriptor */ + xgene_dma_prep_xor_desc(chan, new, &dst, src, + src_cnt, &len, multi); + + if (!first) + first = new; + + new->tx.cookie = 0; + async_tx_ack(&new->tx); + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + } while (len); + + new->tx.flags = flags; /* client is in control of this ack */ + new->tx.cookie = -EBUSY; + list_splice(&first->tx_list, &new->tx_list); + + return &new->tx; + +fail: + if (!first) + return NULL; + + xgene_dma_free_tx_desc_list(chan, &first->tx_list); + return NULL; +} + +static struct dma_async_tx_descriptor *xgene_dma_prep_pq( + struct dma_chan *dchan, dma_addr_t *dst, dma_addr_t *src, + u32 src_cnt, const u8 *scf, size_t len, unsigned long flags) +{ + struct xgene_dma_desc_sw *first = NULL, *new; + struct xgene_dma_chan *chan; + size_t _len = len; + dma_addr_t _src[XGENE_DMA_MAX_XOR_SRC]; + static u8 multi[XGENE_DMA_MAX_XOR_SRC] = {0x01, 0x01, 0x01, 0x01, 0x01}; + + if (unlikely(!dchan || !len)) + return NULL; + + chan = to_dma_chan(dchan); + + /* + * Save source addresses on local variable, may be we have to + * prepare two descriptor to generate P and Q if both enabled + * in the flags by client + */ + memcpy(_src, src, sizeof(*src) * src_cnt); + + if (flags & DMA_PREP_PQ_DISABLE_P) + len = 0; + + if (flags & DMA_PREP_PQ_DISABLE_Q) + _len = 0; + + do { + /* Allocate the link descriptor from DMA pool */ + new = xgene_dma_alloc_descriptor(chan); + if (!new) + goto fail; + + if (!first) + first = new; + + new->tx.cookie = 0; + async_tx_ack(&new->tx); + + /* Insert the link descriptor to the LD ring */ + list_add_tail(&new->node, &first->tx_list); + + /* + * Prepare DMA descriptor to generate P, + * if DMA_PREP_PQ_DISABLE_P flag is not set + */ + if (len) { + xgene_dma_prep_xor_desc(chan, new, &dst[0], src, + src_cnt, &len, multi); + continue; + } + + /* + * Prepare DMA descriptor to generate Q, + * if DMA_PREP_PQ_DISABLE_Q flag is not set + */ + if (_len) { + xgene_dma_prep_xor_desc(chan, new, &dst[1], _src, + src_cnt, &_len, scf); + } + } while (len || _len); + + new->tx.flags = flags; /* client is in control of this ack */ + new->tx.cookie = -EBUSY; + list_splice(&first->tx_list, &new->tx_list); + + return &new->tx; + +fail: + if (!first) + return NULL; + + xgene_dma_free_tx_desc_list(chan, &first->tx_list); + return NULL; +} + +static void xgene_dma_issue_pending(struct dma_chan *dchan) +{ + struct xgene_dma_chan *chan = to_dma_chan(dchan); + + spin_lock_bh(&chan->lock); + xgene_chan_xfer_ld_pending(chan); + spin_unlock_bh(&chan->lock); +} + +static enum dma_status xgene_dma_tx_status(struct dma_chan *dchan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + return dma_cookie_status(dchan, cookie, txstate); +} + +static void xgene_dma_tasklet_cb(unsigned long data) +{ + struct xgene_dma_chan *chan = (struct xgene_dma_chan *)data; + + spin_lock_bh(&chan->lock); + + /* Run all cleanup for descriptors which have been completed */ + xgene_dma_cleanup_descriptors(chan); + + /* Re-enable DMA channel IRQ */ + enable_irq(chan->rx_irq); + + spin_unlock_bh(&chan->lock); +} + +static irqreturn_t xgene_dma_chan_ring_isr(int irq, void *id) +{ + struct xgene_dma_chan *chan = (struct xgene_dma_chan *)id; + + BUG_ON(!chan); + + /* + * Disable DMA channel IRQ until we process completed + * descriptors + */ + disable_irq_nosync(chan->rx_irq); + + /* + * Schedule the tasklet to handle all cleanup of the current + * transaction. It will start a new transaction if there is + * one pending. + */ + tasklet_schedule(&chan->tasklet); + + return IRQ_HANDLED; +} + +static irqreturn_t xgene_dma_err_isr(int irq, void *id) +{ + struct xgene_dma *pdma = (struct xgene_dma *)id; + unsigned long int_mask; + u32 val, i; + + val = ioread32(pdma->csr_dma + XGENE_DMA_INT); + + /* Clear DMA interrupts */ + iowrite32(val, pdma->csr_dma + XGENE_DMA_INT); + + /* Print DMA error info */ + int_mask = val >> XGENE_DMA_INT_MASK_SHIFT; + for_each_set_bit(i, &int_mask, ARRAY_SIZE(xgene_dma_err)) + dev_err(pdma->dev, + "Interrupt status 0x%08X %s\n", val, xgene_dma_err[i]); + + return IRQ_HANDLED; +} + +static void xgene_dma_wr_ring_state(struct xgene_dma_ring *ring) +{ + int i; + + iowrite32(ring->num, ring->pdma->csr_ring + XGENE_DMA_RING_STATE); + + for (i = 0; i < XGENE_DMA_RING_NUM_CONFIG; i++) + iowrite32(ring->state[i], ring->pdma->csr_ring + + XGENE_DMA_RING_STATE_WR_BASE + (i * 4)); +} + +static void xgene_dma_clr_ring_state(struct xgene_dma_ring *ring) +{ + memset(ring->state, 0, sizeof(u32) * XGENE_DMA_RING_NUM_CONFIG); + xgene_dma_wr_ring_state(ring); +} + +static void xgene_dma_setup_ring(struct xgene_dma_ring *ring) +{ + void *ring_cfg = ring->state; + u64 addr = ring->desc_paddr; + void *desc; + u32 i, val; + + ring->slots = ring->size / XGENE_DMA_RING_WQ_DESC_SIZE; + + /* Clear DMA ring state */ + xgene_dma_clr_ring_state(ring); + + /* Set DMA ring type */ + XGENE_DMA_RING_TYPE_SET(ring_cfg, XGENE_DMA_RING_TYPE_REGULAR); + + if (ring->owner == XGENE_DMA_RING_OWNER_DMA) { + /* Set recombination buffer and timeout */ + XGENE_DMA_RING_RECOMBBUF_SET(ring_cfg); + XGENE_DMA_RING_RECOMTIMEOUTL_SET(ring_cfg); + XGENE_DMA_RING_RECOMTIMEOUTH_SET(ring_cfg); + } + + /* Initialize DMA ring state */ + XGENE_DMA_RING_SELTHRSH_SET(ring_cfg); + XGENE_DMA_RING_ACCEPTLERR_SET(ring_cfg); + XGENE_DMA_RING_COHERENT_SET(ring_cfg); + XGENE_DMA_RING_ADDRL_SET(ring_cfg, addr); + XGENE_DMA_RING_ADDRH_SET(ring_cfg, addr); + XGENE_DMA_RING_SIZE_SET(ring_cfg, ring->cfgsize); + + /* Write DMA ring configurations */ + xgene_dma_wr_ring_state(ring); + + /* Set DMA ring id */ + iowrite32(XGENE_DMA_RING_ID_SETUP(ring->id), + ring->pdma->csr_ring + XGENE_DMA_RING_ID); + + /* Set DMA ring buffer */ + iowrite32(XGENE_DMA_RING_ID_BUF_SETUP(ring->num), + ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF); + + if (ring->owner != XGENE_DMA_RING_OWNER_CPU) + return; + + /* Set empty signature to DMA Rx ring descriptors */ + for (i = 0; i < ring->slots; i++) { + desc = &ring->desc_hw[i]; + XGENE_DMA_DESC_SET_EMPTY(desc); + } + + /* Enable DMA Rx ring interrupt */ + val = ioread32(ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE); + XGENE_DMA_RING_NE_INT_MODE_SET(val, ring->buf_num); + iowrite32(val, ring->pdma->csr_ring + XGENE_DMA_RING_NE_INT_MODE); +} + +static void xgene_dma_clear_ring(struct xgene_dma_ring *ring) +{ + u32 ring_id, val; + + if (ring->owner == XGENE_DMA_RING_OWNER_CPU) { + /* Disable DMA Rx ring interrupt */ + val = ioread32(ring->pdma->csr_ring + + XGENE_DMA_RING_NE_INT_MODE); + XGENE_DMA_RING_NE_INT_MODE_RESET(val, ring->buf_num); + iowrite32(val, ring->pdma->csr_ring + + XGENE_DMA_RING_NE_INT_MODE); + } + + /* Clear DMA ring state */ + ring_id = XGENE_DMA_RING_ID_SETUP(ring->id); + iowrite32(ring_id, ring->pdma->csr_ring + XGENE_DMA_RING_ID); + + iowrite32(0, ring->pdma->csr_ring + XGENE_DMA_RING_ID_BUF); + xgene_dma_clr_ring_state(ring); +} + +static void xgene_dma_set_ring_cmd(struct xgene_dma_ring *ring) +{ + ring->cmd_base = ring->pdma->csr_ring_cmd + + XGENE_DMA_RING_CMD_BASE_OFFSET((ring->num - + XGENE_DMA_RING_NUM)); + + ring->cmd = ring->cmd_base + XGENE_DMA_RING_CMD_OFFSET; +} + +static int xgene_dma_get_ring_size(struct xgene_dma_chan *chan, + enum xgene_dma_ring_cfgsize cfgsize) +{ + int size; + + switch (cfgsize) { + case XGENE_DMA_RING_CFG_SIZE_512B: + size = 0x200; + break; + case XGENE_DMA_RING_CFG_SIZE_2KB: + size = 0x800; + break; + case XGENE_DMA_RING_CFG_SIZE_16KB: + size = 0x4000; + break; + case XGENE_DMA_RING_CFG_SIZE_64KB: + size = 0x10000; + break; + case XGENE_DMA_RING_CFG_SIZE_512KB: + size = 0x80000; + break; + default: + chan_err(chan, "Unsupported cfg ring size %d\n", cfgsize); + return -EINVAL; + } + + return size; +} + +static void xgene_dma_delete_ring_one(struct xgene_dma_ring *ring) +{ + /* Clear DMA ring configurations */ + xgene_dma_clear_ring(ring); + + /* De-allocate DMA ring descriptor */ + if (ring->desc_vaddr) { + dma_free_coherent(ring->pdma->dev, ring->size, + ring->desc_vaddr, ring->desc_paddr); + ring->desc_vaddr = NULL; + } +} + +static void xgene_dma_delete_chan_rings(struct xgene_dma_chan *chan) +{ + xgene_dma_delete_ring_one(&chan->rx_ring); + xgene_dma_delete_ring_one(&chan->tx_ring); +} + +static int xgene_dma_create_ring_one(struct xgene_dma_chan *chan, + struct xgene_dma_ring *ring, + enum xgene_dma_ring_cfgsize cfgsize) +{ + /* Setup DMA ring descriptor variables */ + ring->pdma = chan->pdma; + ring->cfgsize = cfgsize; + ring->num = chan->pdma->ring_num++; + ring->id = XGENE_DMA_RING_ID_GET(ring->owner, ring->buf_num); + + ring->size = xgene_dma_get_ring_size(chan, cfgsize); + if (ring->size <= 0) + return ring->size; + + /* Allocate memory for DMA ring descriptor */ + ring->desc_vaddr = dma_zalloc_coherent(chan->dev, ring->size, + &ring->desc_paddr, GFP_KERNEL); + if (!ring->desc_vaddr) { + chan_err(chan, "Failed to allocate ring desc\n"); + return -ENOMEM; + } + + /* Configure and enable DMA ring */ + xgene_dma_set_ring_cmd(ring); + xgene_dma_setup_ring(ring); + + return 0; +} + +static int xgene_dma_create_chan_rings(struct xgene_dma_chan *chan) +{ + struct xgene_dma_ring *rx_ring = &chan->rx_ring; + struct xgene_dma_ring *tx_ring = &chan->tx_ring; + int ret; + + /* Create DMA Rx ring descriptor */ + rx_ring->owner = XGENE_DMA_RING_OWNER_CPU; + rx_ring->buf_num = XGENE_DMA_CPU_BUFNUM + chan->id; + + ret = xgene_dma_create_ring_one(chan, rx_ring, + XGENE_DMA_RING_CFG_SIZE_64KB); + if (ret) + return ret; + + chan_dbg(chan, "Rx ring id 0x%X num %d desc 0x%p\n", + rx_ring->id, rx_ring->num, rx_ring->desc_vaddr); + + /* Create DMA Tx ring descriptor */ + tx_ring->owner = XGENE_DMA_RING_OWNER_DMA; + tx_ring->buf_num = XGENE_DMA_BUFNUM + chan->id; + + ret = xgene_dma_create_ring_one(chan, tx_ring, + XGENE_DMA_RING_CFG_SIZE_64KB); + if (ret) { + xgene_dma_delete_ring_one(rx_ring); + return ret; + } + + tx_ring->dst_ring_num = XGENE_DMA_RING_DST_ID(rx_ring->num); + + chan_dbg(chan, + "Tx ring id 0x%X num %d desc 0x%p\n", + tx_ring->id, tx_ring->num, tx_ring->desc_vaddr); + + /* Set the max outstanding request possible to this channel */ + chan->max_outstanding = rx_ring->slots; + + return ret; +} + +static int xgene_dma_init_rings(struct xgene_dma *pdma) +{ + int ret, i, j; + + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) { + ret = xgene_dma_create_chan_rings(&pdma->chan[i]); + if (ret) { + for (j = 0; j < i; j++) + xgene_dma_delete_chan_rings(&pdma->chan[j]); + return ret; + } + } + + return ret; +} + +static void xgene_dma_enable(struct xgene_dma *pdma) +{ + u32 val; + + /* Configure and enable DMA engine */ + val = ioread32(pdma->csr_dma + XGENE_DMA_GCR); + XGENE_DMA_CH_SETUP(val); + XGENE_DMA_ENABLE(val); + iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR); +} + +static void xgene_dma_disable(struct xgene_dma *pdma) +{ + u32 val; + + val = ioread32(pdma->csr_dma + XGENE_DMA_GCR); + XGENE_DMA_DISABLE(val); + iowrite32(val, pdma->csr_dma + XGENE_DMA_GCR); +} + +static void xgene_dma_mask_interrupts(struct xgene_dma *pdma) +{ + /* + * Mask DMA ring overflow, underflow and + * AXI write/read error interrupts + */ + iowrite32(XGENE_DMA_INT_ALL_MASK, + pdma->csr_dma + XGENE_DMA_RING_INT0_MASK); + iowrite32(XGENE_DMA_INT_ALL_MASK, + pdma->csr_dma + XGENE_DMA_RING_INT1_MASK); + iowrite32(XGENE_DMA_INT_ALL_MASK, + pdma->csr_dma + XGENE_DMA_RING_INT2_MASK); + iowrite32(XGENE_DMA_INT_ALL_MASK, + pdma->csr_dma + XGENE_DMA_RING_INT3_MASK); + iowrite32(XGENE_DMA_INT_ALL_MASK, + pdma->csr_dma + XGENE_DMA_RING_INT4_MASK); + + /* Mask DMA error interrupts */ + iowrite32(XGENE_DMA_INT_ALL_MASK, pdma->csr_dma + XGENE_DMA_INT_MASK); +} + +static void xgene_dma_unmask_interrupts(struct xgene_dma *pdma) +{ + /* + * Unmask DMA ring overflow, underflow and + * AXI write/read error interrupts + */ + iowrite32(XGENE_DMA_INT_ALL_UNMASK, + pdma->csr_dma + XGENE_DMA_RING_INT0_MASK); + iowrite32(XGENE_DMA_INT_ALL_UNMASK, + pdma->csr_dma + XGENE_DMA_RING_INT1_MASK); + iowrite32(XGENE_DMA_INT_ALL_UNMASK, + pdma->csr_dma + XGENE_DMA_RING_INT2_MASK); + iowrite32(XGENE_DMA_INT_ALL_UNMASK, + pdma->csr_dma + XGENE_DMA_RING_INT3_MASK); + iowrite32(XGENE_DMA_INT_ALL_UNMASK, + pdma->csr_dma + XGENE_DMA_RING_INT4_MASK); + + /* Unmask DMA error interrupts */ + iowrite32(XGENE_DMA_INT_ALL_UNMASK, + pdma->csr_dma + XGENE_DMA_INT_MASK); +} + +static void xgene_dma_init_hw(struct xgene_dma *pdma) +{ + u32 val; + + /* Associate DMA ring to corresponding ring HW */ + iowrite32(XGENE_DMA_ASSOC_RING_MNGR1, + pdma->csr_dma + XGENE_DMA_CFG_RING_WQ_ASSOC); + + /* Configure RAID6 polynomial control setting */ + if (is_pq_enabled(pdma)) + iowrite32(XGENE_DMA_RAID6_MULTI_CTRL(0x1D), + pdma->csr_dma + XGENE_DMA_RAID6_CONT); + else + dev_info(pdma->dev, "PQ is disabled in HW\n"); + + xgene_dma_enable(pdma); + xgene_dma_unmask_interrupts(pdma); + + /* Get DMA id and version info */ + val = ioread32(pdma->csr_dma + XGENE_DMA_IPBRR); + + /* DMA device info */ + dev_info(pdma->dev, + "X-Gene DMA v%d.%02d.%02d driver registered %d channels", + XGENE_DMA_REV_NO_RD(val), XGENE_DMA_BUS_ID_RD(val), + XGENE_DMA_DEV_ID_RD(val), XGENE_DMA_MAX_CHANNEL); +} + +static int xgene_dma_init_ring_mngr(struct xgene_dma *pdma) +{ + if (ioread32(pdma->csr_ring + XGENE_DMA_RING_CLKEN) && + (!ioread32(pdma->csr_ring + XGENE_DMA_RING_SRST))) + return 0; + + iowrite32(0x3, pdma->csr_ring + XGENE_DMA_RING_CLKEN); + iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_SRST); + + /* Bring up memory */ + iowrite32(0x0, pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN); + + /* Force a barrier */ + ioread32(pdma->csr_ring + XGENE_DMA_RING_MEM_RAM_SHUTDOWN); + + /* reset may take up to 1ms */ + usleep_range(1000, 1100); + + if (ioread32(pdma->csr_ring + XGENE_DMA_RING_BLK_MEM_RDY) + != XGENE_DMA_RING_BLK_MEM_RDY_VAL) { + dev_err(pdma->dev, + "Failed to release ring mngr memory from shutdown\n"); + return -ENODEV; + } + + /* program threshold set 1 and all hysteresis */ + iowrite32(XGENE_DMA_RING_THRESLD0_SET1_VAL, + pdma->csr_ring + XGENE_DMA_RING_THRESLD0_SET1); + iowrite32(XGENE_DMA_RING_THRESLD1_SET1_VAL, + pdma->csr_ring + XGENE_DMA_RING_THRESLD1_SET1); + iowrite32(XGENE_DMA_RING_HYSTERESIS_VAL, + pdma->csr_ring + XGENE_DMA_RING_HYSTERESIS); + + /* Enable QPcore and assign error queue */ + iowrite32(XGENE_DMA_RING_ENABLE, + pdma->csr_ring + XGENE_DMA_RING_CONFIG); + + return 0; +} + +static int xgene_dma_init_mem(struct xgene_dma *pdma) +{ + int ret; + + ret = xgene_dma_init_ring_mngr(pdma); + if (ret) + return ret; + + /* Bring up memory */ + iowrite32(0x0, pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN); + + /* Force a barrier */ + ioread32(pdma->csr_dma + XGENE_DMA_MEM_RAM_SHUTDOWN); + + /* reset may take up to 1ms */ + usleep_range(1000, 1100); + + if (ioread32(pdma->csr_dma + XGENE_DMA_BLK_MEM_RDY) + != XGENE_DMA_BLK_MEM_RDY_VAL) { + dev_err(pdma->dev, + "Failed to release DMA memory from shutdown\n"); + return -ENODEV; + } + + return 0; +} + +static int xgene_dma_request_irqs(struct xgene_dma *pdma) +{ + struct xgene_dma_chan *chan; + int ret, i, j; + + /* Register DMA error irq */ + ret = devm_request_irq(pdma->dev, pdma->err_irq, xgene_dma_err_isr, + 0, "dma_error", pdma); + if (ret) { + dev_err(pdma->dev, + "Failed to register error IRQ %d\n", pdma->err_irq); + return ret; + } + + /* Register DMA channel rx irq */ + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) { + chan = &pdma->chan[i]; + ret = devm_request_irq(chan->dev, chan->rx_irq, + xgene_dma_chan_ring_isr, + 0, chan->name, chan); + if (ret) { + chan_err(chan, "Failed to register Rx IRQ %d\n", + chan->rx_irq); + devm_free_irq(pdma->dev, pdma->err_irq, pdma); + + for (j = 0; j < i; j++) { + chan = &pdma->chan[i]; + devm_free_irq(chan->dev, chan->rx_irq, chan); + } + + return ret; + } + } + + return 0; +} + +static void xgene_dma_free_irqs(struct xgene_dma *pdma) +{ + struct xgene_dma_chan *chan; + int i; + + /* Free DMA device error irq */ + devm_free_irq(pdma->dev, pdma->err_irq, pdma); + + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) { + chan = &pdma->chan[i]; + devm_free_irq(chan->dev, chan->rx_irq, chan); + } +} + +static void xgene_dma_set_caps(struct xgene_dma_chan *chan, + struct dma_device *dma_dev) +{ + /* Initialize DMA device capability mask */ + dma_cap_zero(dma_dev->cap_mask); + + /* Set DMA device capability */ + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + dma_cap_set(DMA_SG, dma_dev->cap_mask); + + /* Basically here, the X-Gene SoC DMA engine channel 0 supports XOR + * and channel 1 supports XOR, PQ both. First thing here is we have + * mechanism in hw to enable/disable PQ/XOR supports on channel 1, + * we can make sure this by reading SoC Efuse register. + * Second thing, we have hw errata that if we run channel 0 and + * channel 1 simultaneously with executing XOR and PQ request, + * suddenly DMA engine hangs, So here we enable XOR on channel 0 only + * if XOR and PQ supports on channel 1 is disabled. + */ + if ((chan->id == XGENE_DMA_PQ_CHANNEL) && + is_pq_enabled(chan->pdma)) { + dma_cap_set(DMA_PQ, dma_dev->cap_mask); + dma_cap_set(DMA_XOR, dma_dev->cap_mask); + } else if ((chan->id == XGENE_DMA_XOR_CHANNEL) && + !is_pq_enabled(chan->pdma)) { + dma_cap_set(DMA_XOR, dma_dev->cap_mask); + } + + /* Set base and prep routines */ + dma_dev->dev = chan->dev; + dma_dev->device_alloc_chan_resources = xgene_dma_alloc_chan_resources; + dma_dev->device_free_chan_resources = xgene_dma_free_chan_resources; + dma_dev->device_issue_pending = xgene_dma_issue_pending; + dma_dev->device_tx_status = xgene_dma_tx_status; + dma_dev->device_prep_dma_memcpy = xgene_dma_prep_memcpy; + dma_dev->device_prep_dma_sg = xgene_dma_prep_sg; + + if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { + dma_dev->device_prep_dma_xor = xgene_dma_prep_xor; + dma_dev->max_xor = XGENE_DMA_MAX_XOR_SRC; + dma_dev->xor_align = XGENE_DMA_XOR_ALIGNMENT; + } + + if (dma_has_cap(DMA_PQ, dma_dev->cap_mask)) { + dma_dev->device_prep_dma_pq = xgene_dma_prep_pq; + dma_dev->max_pq = XGENE_DMA_MAX_XOR_SRC; + dma_dev->pq_align = XGENE_DMA_XOR_ALIGNMENT; + } +} + +static int xgene_dma_async_register(struct xgene_dma *pdma, int id) +{ + struct xgene_dma_chan *chan = &pdma->chan[id]; + struct dma_device *dma_dev = &pdma->dma_dev[id]; + int ret; + + chan->dma_chan.device = dma_dev; + + spin_lock_init(&chan->lock); + INIT_LIST_HEAD(&chan->ld_pending); + INIT_LIST_HEAD(&chan->ld_running); + INIT_LIST_HEAD(&chan->ld_completed); + tasklet_init(&chan->tasklet, xgene_dma_tasklet_cb, + (unsigned long)chan); + + chan->pending = 0; + chan->desc_pool = NULL; + dma_cookie_init(&chan->dma_chan); + + /* Setup dma device capabilities and prep routines */ + xgene_dma_set_caps(chan, dma_dev); + + /* Initialize DMA device list head */ + INIT_LIST_HEAD(&dma_dev->channels); + list_add_tail(&chan->dma_chan.device_node, &dma_dev->channels); + + /* Register with Linux async DMA framework*/ + ret = dma_async_device_register(dma_dev); + if (ret) { + chan_err(chan, "Failed to register async device %d", ret); + tasklet_kill(&chan->tasklet); + + return ret; + } + + /* DMA capability info */ + dev_info(pdma->dev, + "%s: CAPABILITY ( %s%s%s%s)\n", dma_chan_name(&chan->dma_chan), + dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask) ? "MEMCPY " : "", + dma_has_cap(DMA_SG, dma_dev->cap_mask) ? "SGCPY " : "", + dma_has_cap(DMA_XOR, dma_dev->cap_mask) ? "XOR " : "", + dma_has_cap(DMA_PQ, dma_dev->cap_mask) ? "PQ " : ""); + + return 0; +} + +static int xgene_dma_init_async(struct xgene_dma *pdma) +{ + int ret, i, j; + + for (i = 0; i < XGENE_DMA_MAX_CHANNEL ; i++) { + ret = xgene_dma_async_register(pdma, i); + if (ret) { + for (j = 0; j < i; j++) { + dma_async_device_unregister(&pdma->dma_dev[j]); + tasklet_kill(&pdma->chan[j].tasklet); + } + + return ret; + } + } + + return ret; +} + +static void xgene_dma_async_unregister(struct xgene_dma *pdma) +{ + int i; + + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) + dma_async_device_unregister(&pdma->dma_dev[i]); +} + +static void xgene_dma_init_channels(struct xgene_dma *pdma) +{ + struct xgene_dma_chan *chan; + int i; + + pdma->ring_num = XGENE_DMA_RING_NUM; + + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) { + chan = &pdma->chan[i]; + chan->dev = pdma->dev; + chan->pdma = pdma; + chan->id = i; + snprintf(chan->name, sizeof(chan->name), "dmachan%d", chan->id); + } +} + +static int xgene_dma_get_resources(struct platform_device *pdev, + struct xgene_dma *pdma) +{ + struct resource *res; + int irq, i; + + /* Get DMA csr region */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "Failed to get csr region\n"); + return -ENXIO; + } + + pdma->csr_dma = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!pdma->csr_dma) { + dev_err(&pdev->dev, "Failed to ioremap csr region"); + return -ENOMEM; + } + + /* Get DMA ring csr region */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res) { + dev_err(&pdev->dev, "Failed to get ring csr region\n"); + return -ENXIO; + } + + pdma->csr_ring = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!pdma->csr_ring) { + dev_err(&pdev->dev, "Failed to ioremap ring csr region"); + return -ENOMEM; + } + + /* Get DMA ring cmd csr region */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + if (!res) { + dev_err(&pdev->dev, "Failed to get ring cmd csr region\n"); + return -ENXIO; + } + + pdma->csr_ring_cmd = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!pdma->csr_ring_cmd) { + dev_err(&pdev->dev, "Failed to ioremap ring cmd csr region"); + return -ENOMEM; + } + + /* Get efuse csr region */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 3); + if (!res) { + dev_err(&pdev->dev, "Failed to get efuse csr region\n"); + return -ENXIO; + } + + pdma->csr_efuse = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!pdma->csr_efuse) { + dev_err(&pdev->dev, "Failed to ioremap efuse csr region"); + return -ENOMEM; + } + + /* Get DMA error interrupt */ + irq = platform_get_irq(pdev, 0); + if (irq <= 0) { + dev_err(&pdev->dev, "Failed to get Error IRQ\n"); + return -ENXIO; + } + + pdma->err_irq = irq; + + /* Get DMA Rx ring descriptor interrupts for all DMA channels */ + for (i = 1; i <= XGENE_DMA_MAX_CHANNEL; i++) { + irq = platform_get_irq(pdev, i); + if (irq <= 0) { + dev_err(&pdev->dev, "Failed to get Rx IRQ\n"); + return -ENXIO; + } + + pdma->chan[i - 1].rx_irq = irq; + } + + return 0; +} + +static int xgene_dma_probe(struct platform_device *pdev) +{ + struct xgene_dma *pdma; + int ret, i; + + pdma = devm_kzalloc(&pdev->dev, sizeof(*pdma), GFP_KERNEL); + if (!pdma) + return -ENOMEM; + + pdma->dev = &pdev->dev; + platform_set_drvdata(pdev, pdma); + + ret = xgene_dma_get_resources(pdev, pdma); + if (ret) + return ret; + + pdma->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(pdma->clk)) { + dev_err(&pdev->dev, "Failed to get clk\n"); + return PTR_ERR(pdma->clk); + } + + /* Enable clk before accessing registers */ + ret = clk_prepare_enable(pdma->clk); + if (ret) { + dev_err(&pdev->dev, "Failed to enable clk %d\n", ret); + return ret; + } + + /* Remove DMA RAM out of shutdown */ + ret = xgene_dma_init_mem(pdma); + if (ret) + goto err_clk_enable; + + ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(42)); + if (ret) { + dev_err(&pdev->dev, "No usable DMA configuration\n"); + goto err_dma_mask; + } + + /* Initialize DMA channels software state */ + xgene_dma_init_channels(pdma); + + /* Configue DMA rings */ + ret = xgene_dma_init_rings(pdma); + if (ret) + goto err_clk_enable; + + ret = xgene_dma_request_irqs(pdma); + if (ret) + goto err_request_irq; + + /* Configure and enable DMA engine */ + xgene_dma_init_hw(pdma); + + /* Register DMA device with linux async framework */ + ret = xgene_dma_init_async(pdma); + if (ret) + goto err_async_init; + + return 0; + +err_async_init: + xgene_dma_free_irqs(pdma); + +err_request_irq: + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) + xgene_dma_delete_chan_rings(&pdma->chan[i]); + +err_dma_mask: +err_clk_enable: + clk_disable_unprepare(pdma->clk); + + return ret; +} + +static int xgene_dma_remove(struct platform_device *pdev) +{ + struct xgene_dma *pdma = platform_get_drvdata(pdev); + struct xgene_dma_chan *chan; + int i; + + xgene_dma_async_unregister(pdma); + + /* Mask interrupts and disable DMA engine */ + xgene_dma_mask_interrupts(pdma); + xgene_dma_disable(pdma); + xgene_dma_free_irqs(pdma); + + for (i = 0; i < XGENE_DMA_MAX_CHANNEL; i++) { + chan = &pdma->chan[i]; + tasklet_kill(&chan->tasklet); + xgene_dma_delete_chan_rings(chan); + } + + clk_disable_unprepare(pdma->clk); + + return 0; +} + +static const struct of_device_id xgene_dma_of_match_ptr[] = { + {.compatible = "apm,xgene-storm-dma",}, + {}, +}; +MODULE_DEVICE_TABLE(of, xgene_dma_of_match_ptr); + +static struct platform_driver xgene_dma_driver = { + .probe = xgene_dma_probe, + .remove = xgene_dma_remove, + .driver = { + .name = "X-Gene-DMA", + .of_match_table = xgene_dma_of_match_ptr, + }, +}; + +module_platform_driver(xgene_dma_driver); + +MODULE_DESCRIPTION("APM X-Gene SoC DMA driver"); +MODULE_AUTHOR("Rameshwar Prasad Sahu <rsahu@apm.com>"); +MODULE_AUTHOR("Loc Ho <lho@apm.com>"); +MODULE_LICENSE("GPL"); +MODULE_VERSION("1.0"); diff --git a/drivers/dma/xilinx/Makefile b/drivers/dma/xilinx/Makefile new file mode 100644 index 000000000..3c4e9f2fe --- /dev/null +++ b/drivers/dma/xilinx/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_XILINX_VDMA) += xilinx_vdma.o diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c new file mode 100644 index 000000000..d8434d465 --- /dev/null +++ b/drivers/dma/xilinx/xilinx_vdma.c @@ -0,0 +1,1366 @@ +/* + * DMA driver for Xilinx Video DMA Engine + * + * Copyright (C) 2010-2014 Xilinx, Inc. All rights reserved. + * + * Based on the Freescale DMA driver. + * + * Description: + * The AXI Video Direct Memory Access (AXI VDMA) core is a soft Xilinx IP + * core that provides high-bandwidth direct memory access between memory + * and AXI4-Stream type video target peripherals. The core provides efficient + * two dimensional DMA operations with independent asynchronous read (S2MM) + * and write (MM2S) channel operation. It can be configured to have either + * one channel or two channels. If configured as two channels, one is to + * transmit to the video device (MM2S) and another is to receive from the + * video device (S2MM). Initialization, status, interrupt and management + * registers are accessed through an AXI4-Lite slave interface. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/bitops.h> +#include <linux/dmapool.h> +#include <linux/dma/xilinx_dma.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_dma.h> +#include <linux/of_platform.h> +#include <linux/of_irq.h> +#include <linux/slab.h> + +#include "../dmaengine.h" + +/* Register/Descriptor Offsets */ +#define XILINX_VDMA_MM2S_CTRL_OFFSET 0x0000 +#define XILINX_VDMA_S2MM_CTRL_OFFSET 0x0030 +#define XILINX_VDMA_MM2S_DESC_OFFSET 0x0050 +#define XILINX_VDMA_S2MM_DESC_OFFSET 0x00a0 + +/* Control Registers */ +#define XILINX_VDMA_REG_DMACR 0x0000 +#define XILINX_VDMA_DMACR_DELAY_MAX 0xff +#define XILINX_VDMA_DMACR_DELAY_SHIFT 24 +#define XILINX_VDMA_DMACR_FRAME_COUNT_MAX 0xff +#define XILINX_VDMA_DMACR_FRAME_COUNT_SHIFT 16 +#define XILINX_VDMA_DMACR_ERR_IRQ BIT(14) +#define XILINX_VDMA_DMACR_DLY_CNT_IRQ BIT(13) +#define XILINX_VDMA_DMACR_FRM_CNT_IRQ BIT(12) +#define XILINX_VDMA_DMACR_MASTER_SHIFT 8 +#define XILINX_VDMA_DMACR_FSYNCSRC_SHIFT 5 +#define XILINX_VDMA_DMACR_FRAMECNT_EN BIT(4) +#define XILINX_VDMA_DMACR_GENLOCK_EN BIT(3) +#define XILINX_VDMA_DMACR_RESET BIT(2) +#define XILINX_VDMA_DMACR_CIRC_EN BIT(1) +#define XILINX_VDMA_DMACR_RUNSTOP BIT(0) +#define XILINX_VDMA_DMACR_FSYNCSRC_MASK GENMASK(6, 5) + +#define XILINX_VDMA_REG_DMASR 0x0004 +#define XILINX_VDMA_DMASR_EOL_LATE_ERR BIT(15) +#define XILINX_VDMA_DMASR_ERR_IRQ BIT(14) +#define XILINX_VDMA_DMASR_DLY_CNT_IRQ BIT(13) +#define XILINX_VDMA_DMASR_FRM_CNT_IRQ BIT(12) +#define XILINX_VDMA_DMASR_SOF_LATE_ERR BIT(11) +#define XILINX_VDMA_DMASR_SG_DEC_ERR BIT(10) +#define XILINX_VDMA_DMASR_SG_SLV_ERR BIT(9) +#define XILINX_VDMA_DMASR_EOF_EARLY_ERR BIT(8) +#define XILINX_VDMA_DMASR_SOF_EARLY_ERR BIT(7) +#define XILINX_VDMA_DMASR_DMA_DEC_ERR BIT(6) +#define XILINX_VDMA_DMASR_DMA_SLAVE_ERR BIT(5) +#define XILINX_VDMA_DMASR_DMA_INT_ERR BIT(4) +#define XILINX_VDMA_DMASR_IDLE BIT(1) +#define XILINX_VDMA_DMASR_HALTED BIT(0) +#define XILINX_VDMA_DMASR_DELAY_MASK GENMASK(31, 24) +#define XILINX_VDMA_DMASR_FRAME_COUNT_MASK GENMASK(23, 16) + +#define XILINX_VDMA_REG_CURDESC 0x0008 +#define XILINX_VDMA_REG_TAILDESC 0x0010 +#define XILINX_VDMA_REG_REG_INDEX 0x0014 +#define XILINX_VDMA_REG_FRMSTORE 0x0018 +#define XILINX_VDMA_REG_THRESHOLD 0x001c +#define XILINX_VDMA_REG_FRMPTR_STS 0x0024 +#define XILINX_VDMA_REG_PARK_PTR 0x0028 +#define XILINX_VDMA_PARK_PTR_WR_REF_SHIFT 8 +#define XILINX_VDMA_PARK_PTR_RD_REF_SHIFT 0 +#define XILINX_VDMA_REG_VDMA_VERSION 0x002c + +/* Register Direct Mode Registers */ +#define XILINX_VDMA_REG_VSIZE 0x0000 +#define XILINX_VDMA_REG_HSIZE 0x0004 + +#define XILINX_VDMA_REG_FRMDLY_STRIDE 0x0008 +#define XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT 24 +#define XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT 0 + +#define XILINX_VDMA_REG_START_ADDRESS(n) (0x000c + 4 * (n)) + +/* HW specific definitions */ +#define XILINX_VDMA_MAX_CHANS_PER_DEVICE 0x2 + +#define XILINX_VDMA_DMAXR_ALL_IRQ_MASK \ + (XILINX_VDMA_DMASR_FRM_CNT_IRQ | \ + XILINX_VDMA_DMASR_DLY_CNT_IRQ | \ + XILINX_VDMA_DMASR_ERR_IRQ) + +#define XILINX_VDMA_DMASR_ALL_ERR_MASK \ + (XILINX_VDMA_DMASR_EOL_LATE_ERR | \ + XILINX_VDMA_DMASR_SOF_LATE_ERR | \ + XILINX_VDMA_DMASR_SG_DEC_ERR | \ + XILINX_VDMA_DMASR_SG_SLV_ERR | \ + XILINX_VDMA_DMASR_EOF_EARLY_ERR | \ + XILINX_VDMA_DMASR_SOF_EARLY_ERR | \ + XILINX_VDMA_DMASR_DMA_DEC_ERR | \ + XILINX_VDMA_DMASR_DMA_SLAVE_ERR | \ + XILINX_VDMA_DMASR_DMA_INT_ERR) + +/* + * Recoverable errors are DMA Internal error, SOF Early, EOF Early + * and SOF Late. They are only recoverable when C_FLUSH_ON_FSYNC + * is enabled in the h/w system. + */ +#define XILINX_VDMA_DMASR_ERR_RECOVER_MASK \ + (XILINX_VDMA_DMASR_SOF_LATE_ERR | \ + XILINX_VDMA_DMASR_EOF_EARLY_ERR | \ + XILINX_VDMA_DMASR_SOF_EARLY_ERR | \ + XILINX_VDMA_DMASR_DMA_INT_ERR) + +/* Axi VDMA Flush on Fsync bits */ +#define XILINX_VDMA_FLUSH_S2MM 3 +#define XILINX_VDMA_FLUSH_MM2S 2 +#define XILINX_VDMA_FLUSH_BOTH 1 + +/* Delay loop counter to prevent hardware failure */ +#define XILINX_VDMA_LOOP_COUNT 1000000 + +/** + * struct xilinx_vdma_desc_hw - Hardware Descriptor + * @next_desc: Next Descriptor Pointer @0x00 + * @pad1: Reserved @0x04 + * @buf_addr: Buffer address @0x08 + * @pad2: Reserved @0x0C + * @vsize: Vertical Size @0x10 + * @hsize: Horizontal Size @0x14 + * @stride: Number of bytes between the first + * pixels of each horizontal line @0x18 + */ +struct xilinx_vdma_desc_hw { + u32 next_desc; + u32 pad1; + u32 buf_addr; + u32 pad2; + u32 vsize; + u32 hsize; + u32 stride; +} __aligned(64); + +/** + * struct xilinx_vdma_tx_segment - Descriptor segment + * @hw: Hardware descriptor + * @node: Node in the descriptor segments list + * @phys: Physical address of segment + */ +struct xilinx_vdma_tx_segment { + struct xilinx_vdma_desc_hw hw; + struct list_head node; + dma_addr_t phys; +} __aligned(64); + +/** + * struct xilinx_vdma_tx_descriptor - Per Transaction structure + * @async_tx: Async transaction descriptor + * @segments: TX segments list + * @node: Node in the channel descriptors list + */ +struct xilinx_vdma_tx_descriptor { + struct dma_async_tx_descriptor async_tx; + struct list_head segments; + struct list_head node; +}; + +/** + * struct xilinx_vdma_chan - Driver specific VDMA channel structure + * @xdev: Driver specific device structure + * @ctrl_offset: Control registers offset + * @desc_offset: TX descriptor registers offset + * @lock: Descriptor operation lock + * @pending_list: Descriptors waiting + * @active_desc: Active descriptor + * @allocated_desc: Allocated descriptor + * @done_list: Complete descriptors + * @common: DMA common channel + * @desc_pool: Descriptors pool + * @dev: The dma device + * @irq: Channel IRQ + * @id: Channel ID + * @direction: Transfer direction + * @num_frms: Number of frames + * @has_sg: Support scatter transfers + * @genlock: Support genlock mode + * @err: Channel has errors + * @tasklet: Cleanup work after irq + * @config: Device configuration info + * @flush_on_fsync: Flush on Frame sync + */ +struct xilinx_vdma_chan { + struct xilinx_vdma_device *xdev; + u32 ctrl_offset; + u32 desc_offset; + spinlock_t lock; + struct list_head pending_list; + struct xilinx_vdma_tx_descriptor *active_desc; + struct xilinx_vdma_tx_descriptor *allocated_desc; + struct list_head done_list; + struct dma_chan common; + struct dma_pool *desc_pool; + struct device *dev; + int irq; + int id; + enum dma_transfer_direction direction; + int num_frms; + bool has_sg; + bool genlock; + bool err; + struct tasklet_struct tasklet; + struct xilinx_vdma_config config; + bool flush_on_fsync; +}; + +/** + * struct xilinx_vdma_device - VDMA device structure + * @regs: I/O mapped base address + * @dev: Device Structure + * @common: DMA device structure + * @chan: Driver specific VDMA channel + * @has_sg: Specifies whether Scatter-Gather is present or not + * @flush_on_fsync: Flush on frame sync + */ +struct xilinx_vdma_device { + void __iomem *regs; + struct device *dev; + struct dma_device common; + struct xilinx_vdma_chan *chan[XILINX_VDMA_MAX_CHANS_PER_DEVICE]; + bool has_sg; + u32 flush_on_fsync; +}; + +/* Macros */ +#define to_xilinx_chan(chan) \ + container_of(chan, struct xilinx_vdma_chan, common) +#define to_vdma_tx_descriptor(tx) \ + container_of(tx, struct xilinx_vdma_tx_descriptor, async_tx) + +/* IO accessors */ +static inline u32 vdma_read(struct xilinx_vdma_chan *chan, u32 reg) +{ + return ioread32(chan->xdev->regs + reg); +} + +static inline void vdma_write(struct xilinx_vdma_chan *chan, u32 reg, u32 value) +{ + iowrite32(value, chan->xdev->regs + reg); +} + +static inline void vdma_desc_write(struct xilinx_vdma_chan *chan, u32 reg, + u32 value) +{ + vdma_write(chan, chan->desc_offset + reg, value); +} + +static inline u32 vdma_ctrl_read(struct xilinx_vdma_chan *chan, u32 reg) +{ + return vdma_read(chan, chan->ctrl_offset + reg); +} + +static inline void vdma_ctrl_write(struct xilinx_vdma_chan *chan, u32 reg, + u32 value) +{ + vdma_write(chan, chan->ctrl_offset + reg, value); +} + +static inline void vdma_ctrl_clr(struct xilinx_vdma_chan *chan, u32 reg, + u32 clr) +{ + vdma_ctrl_write(chan, reg, vdma_ctrl_read(chan, reg) & ~clr); +} + +static inline void vdma_ctrl_set(struct xilinx_vdma_chan *chan, u32 reg, + u32 set) +{ + vdma_ctrl_write(chan, reg, vdma_ctrl_read(chan, reg) | set); +} + +/* ----------------------------------------------------------------------------- + * Descriptors and segments alloc and free + */ + +/** + * xilinx_vdma_alloc_tx_segment - Allocate transaction segment + * @chan: Driver specific VDMA channel + * + * Return: The allocated segment on success and NULL on failure. + */ +static struct xilinx_vdma_tx_segment * +xilinx_vdma_alloc_tx_segment(struct xilinx_vdma_chan *chan) +{ + struct xilinx_vdma_tx_segment *segment; + dma_addr_t phys; + + segment = dma_pool_alloc(chan->desc_pool, GFP_ATOMIC, &phys); + if (!segment) + return NULL; + + memset(segment, 0, sizeof(*segment)); + segment->phys = phys; + + return segment; +} + +/** + * xilinx_vdma_free_tx_segment - Free transaction segment + * @chan: Driver specific VDMA channel + * @segment: VDMA transaction segment + */ +static void xilinx_vdma_free_tx_segment(struct xilinx_vdma_chan *chan, + struct xilinx_vdma_tx_segment *segment) +{ + dma_pool_free(chan->desc_pool, segment, segment->phys); +} + +/** + * xilinx_vdma_tx_descriptor - Allocate transaction descriptor + * @chan: Driver specific VDMA channel + * + * Return: The allocated descriptor on success and NULL on failure. + */ +static struct xilinx_vdma_tx_descriptor * +xilinx_vdma_alloc_tx_descriptor(struct xilinx_vdma_chan *chan) +{ + struct xilinx_vdma_tx_descriptor *desc; + unsigned long flags; + + if (chan->allocated_desc) + return chan->allocated_desc; + + desc = kzalloc(sizeof(*desc), GFP_KERNEL); + if (!desc) + return NULL; + + spin_lock_irqsave(&chan->lock, flags); + chan->allocated_desc = desc; + spin_unlock_irqrestore(&chan->lock, flags); + + INIT_LIST_HEAD(&desc->segments); + + return desc; +} + +/** + * xilinx_vdma_free_tx_descriptor - Free transaction descriptor + * @chan: Driver specific VDMA channel + * @desc: VDMA transaction descriptor + */ +static void +xilinx_vdma_free_tx_descriptor(struct xilinx_vdma_chan *chan, + struct xilinx_vdma_tx_descriptor *desc) +{ + struct xilinx_vdma_tx_segment *segment, *next; + + if (!desc) + return; + + list_for_each_entry_safe(segment, next, &desc->segments, node) { + list_del(&segment->node); + xilinx_vdma_free_tx_segment(chan, segment); + } + + kfree(desc); +} + +/* Required functions */ + +/** + * xilinx_vdma_free_desc_list - Free descriptors list + * @chan: Driver specific VDMA channel + * @list: List to parse and delete the descriptor + */ +static void xilinx_vdma_free_desc_list(struct xilinx_vdma_chan *chan, + struct list_head *list) +{ + struct xilinx_vdma_tx_descriptor *desc, *next; + + list_for_each_entry_safe(desc, next, list, node) { + list_del(&desc->node); + xilinx_vdma_free_tx_descriptor(chan, desc); + } +} + +/** + * xilinx_vdma_free_descriptors - Free channel descriptors + * @chan: Driver specific VDMA channel + */ +static void xilinx_vdma_free_descriptors(struct xilinx_vdma_chan *chan) +{ + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + + xilinx_vdma_free_desc_list(chan, &chan->pending_list); + xilinx_vdma_free_desc_list(chan, &chan->done_list); + + xilinx_vdma_free_tx_descriptor(chan, chan->active_desc); + chan->active_desc = NULL; + + spin_unlock_irqrestore(&chan->lock, flags); +} + +/** + * xilinx_vdma_free_chan_resources - Free channel resources + * @dchan: DMA channel + */ +static void xilinx_vdma_free_chan_resources(struct dma_chan *dchan) +{ + struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan); + + dev_dbg(chan->dev, "Free all channel resources.\n"); + + xilinx_vdma_free_descriptors(chan); + dma_pool_destroy(chan->desc_pool); + chan->desc_pool = NULL; +} + +/** + * xilinx_vdma_chan_desc_cleanup - Clean channel descriptors + * @chan: Driver specific VDMA channel + */ +static void xilinx_vdma_chan_desc_cleanup(struct xilinx_vdma_chan *chan) +{ + struct xilinx_vdma_tx_descriptor *desc, *next; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + + list_for_each_entry_safe(desc, next, &chan->done_list, node) { + dma_async_tx_callback callback; + void *callback_param; + + /* Remove from the list of running transactions */ + list_del(&desc->node); + + /* Run the link descriptor callback function */ + callback = desc->async_tx.callback; + callback_param = desc->async_tx.callback_param; + if (callback) { + spin_unlock_irqrestore(&chan->lock, flags); + callback(callback_param); + spin_lock_irqsave(&chan->lock, flags); + } + + /* Run any dependencies, then free the descriptor */ + dma_run_dependencies(&desc->async_tx); + xilinx_vdma_free_tx_descriptor(chan, desc); + } + + spin_unlock_irqrestore(&chan->lock, flags); +} + +/** + * xilinx_vdma_do_tasklet - Schedule completion tasklet + * @data: Pointer to the Xilinx VDMA channel structure + */ +static void xilinx_vdma_do_tasklet(unsigned long data) +{ + struct xilinx_vdma_chan *chan = (struct xilinx_vdma_chan *)data; + + xilinx_vdma_chan_desc_cleanup(chan); +} + +/** + * xilinx_vdma_alloc_chan_resources - Allocate channel resources + * @dchan: DMA channel + * + * Return: '0' on success and failure value on error + */ +static int xilinx_vdma_alloc_chan_resources(struct dma_chan *dchan) +{ + struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan); + + /* Has this channel already been allocated? */ + if (chan->desc_pool) + return 0; + + /* + * We need the descriptor to be aligned to 64bytes + * for meeting Xilinx VDMA specification requirement. + */ + chan->desc_pool = dma_pool_create("xilinx_vdma_desc_pool", + chan->dev, + sizeof(struct xilinx_vdma_tx_segment), + __alignof__(struct xilinx_vdma_tx_segment), 0); + if (!chan->desc_pool) { + dev_err(chan->dev, + "unable to allocate channel %d descriptor pool\n", + chan->id); + return -ENOMEM; + } + + dma_cookie_init(dchan); + return 0; +} + +/** + * xilinx_vdma_tx_status - Get VDMA transaction status + * @dchan: DMA channel + * @cookie: Transaction identifier + * @txstate: Transaction state + * + * Return: DMA transaction status + */ +static enum dma_status xilinx_vdma_tx_status(struct dma_chan *dchan, + dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + return dma_cookie_status(dchan, cookie, txstate); +} + +/** + * xilinx_vdma_is_running - Check if VDMA channel is running + * @chan: Driver specific VDMA channel + * + * Return: '1' if running, '0' if not. + */ +static bool xilinx_vdma_is_running(struct xilinx_vdma_chan *chan) +{ + return !(vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) & + XILINX_VDMA_DMASR_HALTED) && + (vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) & + XILINX_VDMA_DMACR_RUNSTOP); +} + +/** + * xilinx_vdma_is_idle - Check if VDMA channel is idle + * @chan: Driver specific VDMA channel + * + * Return: '1' if idle, '0' if not. + */ +static bool xilinx_vdma_is_idle(struct xilinx_vdma_chan *chan) +{ + return vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) & + XILINX_VDMA_DMASR_IDLE; +} + +/** + * xilinx_vdma_halt - Halt VDMA channel + * @chan: Driver specific VDMA channel + */ +static void xilinx_vdma_halt(struct xilinx_vdma_chan *chan) +{ + int loop = XILINX_VDMA_LOOP_COUNT; + + vdma_ctrl_clr(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP); + + /* Wait for the hardware to halt */ + do { + if (vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) & + XILINX_VDMA_DMASR_HALTED) + break; + } while (loop--); + + if (!loop) { + dev_err(chan->dev, "Cannot stop channel %p: %x\n", + chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR)); + chan->err = true; + } + + return; +} + +/** + * xilinx_vdma_start - Start VDMA channel + * @chan: Driver specific VDMA channel + */ +static void xilinx_vdma_start(struct xilinx_vdma_chan *chan) +{ + int loop = XILINX_VDMA_LOOP_COUNT; + + vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RUNSTOP); + + /* Wait for the hardware to start */ + do { + if (!(vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR) & + XILINX_VDMA_DMASR_HALTED)) + break; + } while (loop--); + + if (!loop) { + dev_err(chan->dev, "Cannot start channel %p: %x\n", + chan, vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR)); + + chan->err = true; + } + + return; +} + +/** + * xilinx_vdma_start_transfer - Starts VDMA transfer + * @chan: Driver specific channel struct pointer + */ +static void xilinx_vdma_start_transfer(struct xilinx_vdma_chan *chan) +{ + struct xilinx_vdma_config *config = &chan->config; + struct xilinx_vdma_tx_descriptor *desc; + unsigned long flags; + u32 reg; + struct xilinx_vdma_tx_segment *head, *tail = NULL; + + if (chan->err) + return; + + spin_lock_irqsave(&chan->lock, flags); + + /* There's already an active descriptor, bail out. */ + if (chan->active_desc) + goto out_unlock; + + if (list_empty(&chan->pending_list)) + goto out_unlock; + + desc = list_first_entry(&chan->pending_list, + struct xilinx_vdma_tx_descriptor, node); + + /* If it is SG mode and hardware is busy, cannot submit */ + if (chan->has_sg && xilinx_vdma_is_running(chan) && + !xilinx_vdma_is_idle(chan)) { + dev_dbg(chan->dev, "DMA controller still busy\n"); + goto out_unlock; + } + + /* + * If hardware is idle, then all descriptors on the running lists are + * done, start new transfers + */ + if (chan->has_sg) { + head = list_first_entry(&desc->segments, + struct xilinx_vdma_tx_segment, node); + tail = list_entry(desc->segments.prev, + struct xilinx_vdma_tx_segment, node); + + vdma_ctrl_write(chan, XILINX_VDMA_REG_CURDESC, head->phys); + } + + /* Configure the hardware using info in the config structure */ + reg = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR); + + if (config->frm_cnt_en) + reg |= XILINX_VDMA_DMACR_FRAMECNT_EN; + else + reg &= ~XILINX_VDMA_DMACR_FRAMECNT_EN; + + /* + * With SG, start with circular mode, so that BDs can be fetched. + * In direct register mode, if not parking, enable circular mode + */ + if (chan->has_sg || !config->park) + reg |= XILINX_VDMA_DMACR_CIRC_EN; + + if (config->park) + reg &= ~XILINX_VDMA_DMACR_CIRC_EN; + + vdma_ctrl_write(chan, XILINX_VDMA_REG_DMACR, reg); + + if (config->park && (config->park_frm >= 0) && + (config->park_frm < chan->num_frms)) { + if (chan->direction == DMA_MEM_TO_DEV) + vdma_write(chan, XILINX_VDMA_REG_PARK_PTR, + config->park_frm << + XILINX_VDMA_PARK_PTR_RD_REF_SHIFT); + else + vdma_write(chan, XILINX_VDMA_REG_PARK_PTR, + config->park_frm << + XILINX_VDMA_PARK_PTR_WR_REF_SHIFT); + } + + /* Start the hardware */ + xilinx_vdma_start(chan); + + if (chan->err) + goto out_unlock; + + /* Start the transfer */ + if (chan->has_sg) { + vdma_ctrl_write(chan, XILINX_VDMA_REG_TAILDESC, tail->phys); + } else { + struct xilinx_vdma_tx_segment *segment, *last = NULL; + int i = 0; + + list_for_each_entry(segment, &desc->segments, node) { + vdma_desc_write(chan, + XILINX_VDMA_REG_START_ADDRESS(i++), + segment->hw.buf_addr); + last = segment; + } + + if (!last) + goto out_unlock; + + /* HW expects these parameters to be same for one transaction */ + vdma_desc_write(chan, XILINX_VDMA_REG_HSIZE, last->hw.hsize); + vdma_desc_write(chan, XILINX_VDMA_REG_FRMDLY_STRIDE, + last->hw.stride); + vdma_desc_write(chan, XILINX_VDMA_REG_VSIZE, last->hw.vsize); + } + + list_del(&desc->node); + chan->active_desc = desc; + +out_unlock: + spin_unlock_irqrestore(&chan->lock, flags); +} + +/** + * xilinx_vdma_issue_pending - Issue pending transactions + * @dchan: DMA channel + */ +static void xilinx_vdma_issue_pending(struct dma_chan *dchan) +{ + struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan); + + xilinx_vdma_start_transfer(chan); +} + +/** + * xilinx_vdma_complete_descriptor - Mark the active descriptor as complete + * @chan : xilinx DMA channel + * + * CONTEXT: hardirq + */ +static void xilinx_vdma_complete_descriptor(struct xilinx_vdma_chan *chan) +{ + struct xilinx_vdma_tx_descriptor *desc; + unsigned long flags; + + spin_lock_irqsave(&chan->lock, flags); + + desc = chan->active_desc; + if (!desc) { + dev_dbg(chan->dev, "no running descriptors\n"); + goto out_unlock; + } + + dma_cookie_complete(&desc->async_tx); + list_add_tail(&desc->node, &chan->done_list); + + chan->active_desc = NULL; + +out_unlock: + spin_unlock_irqrestore(&chan->lock, flags); +} + +/** + * xilinx_vdma_reset - Reset VDMA channel + * @chan: Driver specific VDMA channel + * + * Return: '0' on success and failure value on error + */ +static int xilinx_vdma_reset(struct xilinx_vdma_chan *chan) +{ + int loop = XILINX_VDMA_LOOP_COUNT; + u32 tmp; + + vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, XILINX_VDMA_DMACR_RESET); + + tmp = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) & + XILINX_VDMA_DMACR_RESET; + + /* Wait for the hardware to finish reset */ + do { + tmp = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR) & + XILINX_VDMA_DMACR_RESET; + } while (loop-- && tmp); + + if (!loop) { + dev_err(chan->dev, "reset timeout, cr %x, sr %x\n", + vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR), + vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR)); + return -ETIMEDOUT; + } + + chan->err = false; + + return 0; +} + +/** + * xilinx_vdma_chan_reset - Reset VDMA channel and enable interrupts + * @chan: Driver specific VDMA channel + * + * Return: '0' on success and failure value on error + */ +static int xilinx_vdma_chan_reset(struct xilinx_vdma_chan *chan) +{ + int err; + + /* Reset VDMA */ + err = xilinx_vdma_reset(chan); + if (err) + return err; + + /* Enable interrupts */ + vdma_ctrl_set(chan, XILINX_VDMA_REG_DMACR, + XILINX_VDMA_DMAXR_ALL_IRQ_MASK); + + return 0; +} + +/** + * xilinx_vdma_irq_handler - VDMA Interrupt handler + * @irq: IRQ number + * @data: Pointer to the Xilinx VDMA channel structure + * + * Return: IRQ_HANDLED/IRQ_NONE + */ +static irqreturn_t xilinx_vdma_irq_handler(int irq, void *data) +{ + struct xilinx_vdma_chan *chan = data; + u32 status; + + /* Read the status and ack the interrupts. */ + status = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMASR); + if (!(status & XILINX_VDMA_DMAXR_ALL_IRQ_MASK)) + return IRQ_NONE; + + vdma_ctrl_write(chan, XILINX_VDMA_REG_DMASR, + status & XILINX_VDMA_DMAXR_ALL_IRQ_MASK); + + if (status & XILINX_VDMA_DMASR_ERR_IRQ) { + /* + * An error occurred. If C_FLUSH_ON_FSYNC is enabled and the + * error is recoverable, ignore it. Otherwise flag the error. + * + * Only recoverable errors can be cleared in the DMASR register, + * make sure not to write to other error bits to 1. + */ + u32 errors = status & XILINX_VDMA_DMASR_ALL_ERR_MASK; + vdma_ctrl_write(chan, XILINX_VDMA_REG_DMASR, + errors & XILINX_VDMA_DMASR_ERR_RECOVER_MASK); + + if (!chan->flush_on_fsync || + (errors & ~XILINX_VDMA_DMASR_ERR_RECOVER_MASK)) { + dev_err(chan->dev, + "Channel %p has errors %x, cdr %x tdr %x\n", + chan, errors, + vdma_ctrl_read(chan, XILINX_VDMA_REG_CURDESC), + vdma_ctrl_read(chan, XILINX_VDMA_REG_TAILDESC)); + chan->err = true; + } + } + + if (status & XILINX_VDMA_DMASR_DLY_CNT_IRQ) { + /* + * Device takes too long to do the transfer when user requires + * responsiveness. + */ + dev_dbg(chan->dev, "Inter-packet latency too long\n"); + } + + if (status & XILINX_VDMA_DMASR_FRM_CNT_IRQ) { + xilinx_vdma_complete_descriptor(chan); + xilinx_vdma_start_transfer(chan); + } + + tasklet_schedule(&chan->tasklet); + return IRQ_HANDLED; +} + +/** + * xilinx_vdma_tx_submit - Submit DMA transaction + * @tx: Async transaction descriptor + * + * Return: cookie value on success and failure value on error + */ +static dma_cookie_t xilinx_vdma_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct xilinx_vdma_tx_descriptor *desc = to_vdma_tx_descriptor(tx); + struct xilinx_vdma_chan *chan = to_xilinx_chan(tx->chan); + dma_cookie_t cookie; + unsigned long flags; + int err; + + if (chan->err) { + /* + * If reset fails, need to hard reset the system. + * Channel is no longer functional + */ + err = xilinx_vdma_chan_reset(chan); + if (err < 0) + return err; + } + + spin_lock_irqsave(&chan->lock, flags); + + cookie = dma_cookie_assign(tx); + + /* Append the transaction to the pending transactions queue. */ + list_add_tail(&desc->node, &chan->pending_list); + + /* Free the allocated desc */ + chan->allocated_desc = NULL; + + spin_unlock_irqrestore(&chan->lock, flags); + + return cookie; +} + +/** + * xilinx_vdma_dma_prep_interleaved - prepare a descriptor for a + * DMA_SLAVE transaction + * @dchan: DMA channel + * @xt: Interleaved template pointer + * @flags: transfer ack flags + * + * Return: Async transaction descriptor on success and NULL on failure + */ +static struct dma_async_tx_descriptor * +xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan, + struct dma_interleaved_template *xt, + unsigned long flags) +{ + struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan); + struct xilinx_vdma_tx_descriptor *desc; + struct xilinx_vdma_tx_segment *segment, *prev = NULL; + struct xilinx_vdma_desc_hw *hw; + + if (!is_slave_direction(xt->dir)) + return NULL; + + if (!xt->numf || !xt->sgl[0].size) + return NULL; + + if (xt->frame_size != 1) + return NULL; + + /* Allocate a transaction descriptor. */ + desc = xilinx_vdma_alloc_tx_descriptor(chan); + if (!desc) + return NULL; + + dma_async_tx_descriptor_init(&desc->async_tx, &chan->common); + desc->async_tx.tx_submit = xilinx_vdma_tx_submit; + async_tx_ack(&desc->async_tx); + + /* Allocate the link descriptor from DMA pool */ + segment = xilinx_vdma_alloc_tx_segment(chan); + if (!segment) + goto error; + + /* Fill in the hardware descriptor */ + hw = &segment->hw; + hw->vsize = xt->numf; + hw->hsize = xt->sgl[0].size; + hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) << + XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT; + hw->stride |= chan->config.frm_dly << + XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT; + + if (xt->dir != DMA_MEM_TO_DEV) + hw->buf_addr = xt->dst_start; + else + hw->buf_addr = xt->src_start; + + /* Link the previous next descriptor to current */ + if (!list_empty(&desc->segments)) { + prev = list_last_entry(&desc->segments, + struct xilinx_vdma_tx_segment, node); + prev->hw.next_desc = segment->phys; + } + + /* Insert the segment into the descriptor segments list. */ + list_add_tail(&segment->node, &desc->segments); + + prev = segment; + + /* Link the last hardware descriptor with the first. */ + segment = list_first_entry(&desc->segments, + struct xilinx_vdma_tx_segment, node); + prev->hw.next_desc = segment->phys; + + return &desc->async_tx; + +error: + xilinx_vdma_free_tx_descriptor(chan, desc); + return NULL; +} + +/** + * xilinx_vdma_terminate_all - Halt the channel and free descriptors + * @chan: Driver specific VDMA Channel pointer + */ +static int xilinx_vdma_terminate_all(struct dma_chan *dchan) +{ + struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan); + + /* Halt the DMA engine */ + xilinx_vdma_halt(chan); + + /* Remove and free all of the descriptors in the lists */ + xilinx_vdma_free_descriptors(chan); + + return 0; +} + +/** + * xilinx_vdma_channel_set_config - Configure VDMA channel + * Run-time configuration for Axi VDMA, supports: + * . halt the channel + * . configure interrupt coalescing and inter-packet delay threshold + * . start/stop parking + * . enable genlock + * + * @dchan: DMA channel + * @cfg: VDMA device configuration pointer + * + * Return: '0' on success and failure value on error + */ +int xilinx_vdma_channel_set_config(struct dma_chan *dchan, + struct xilinx_vdma_config *cfg) +{ + struct xilinx_vdma_chan *chan = to_xilinx_chan(dchan); + u32 dmacr; + + if (cfg->reset) + return xilinx_vdma_chan_reset(chan); + + dmacr = vdma_ctrl_read(chan, XILINX_VDMA_REG_DMACR); + + chan->config.frm_dly = cfg->frm_dly; + chan->config.park = cfg->park; + + /* genlock settings */ + chan->config.gen_lock = cfg->gen_lock; + chan->config.master = cfg->master; + + if (cfg->gen_lock && chan->genlock) { + dmacr |= XILINX_VDMA_DMACR_GENLOCK_EN; + dmacr |= cfg->master << XILINX_VDMA_DMACR_MASTER_SHIFT; + } + + chan->config.frm_cnt_en = cfg->frm_cnt_en; + if (cfg->park) + chan->config.park_frm = cfg->park_frm; + else + chan->config.park_frm = -1; + + chan->config.coalesc = cfg->coalesc; + chan->config.delay = cfg->delay; + + if (cfg->coalesc <= XILINX_VDMA_DMACR_FRAME_COUNT_MAX) { + dmacr |= cfg->coalesc << XILINX_VDMA_DMACR_FRAME_COUNT_SHIFT; + chan->config.coalesc = cfg->coalesc; + } + + if (cfg->delay <= XILINX_VDMA_DMACR_DELAY_MAX) { + dmacr |= cfg->delay << XILINX_VDMA_DMACR_DELAY_SHIFT; + chan->config.delay = cfg->delay; + } + + /* FSync Source selection */ + dmacr &= ~XILINX_VDMA_DMACR_FSYNCSRC_MASK; + dmacr |= cfg->ext_fsync << XILINX_VDMA_DMACR_FSYNCSRC_SHIFT; + + vdma_ctrl_write(chan, XILINX_VDMA_REG_DMACR, dmacr); + + return 0; +} +EXPORT_SYMBOL(xilinx_vdma_channel_set_config); + +/* ----------------------------------------------------------------------------- + * Probe and remove + */ + +/** + * xilinx_vdma_chan_remove - Per Channel remove function + * @chan: Driver specific VDMA channel + */ +static void xilinx_vdma_chan_remove(struct xilinx_vdma_chan *chan) +{ + /* Disable all interrupts */ + vdma_ctrl_clr(chan, XILINX_VDMA_REG_DMACR, + XILINX_VDMA_DMAXR_ALL_IRQ_MASK); + + if (chan->irq > 0) + free_irq(chan->irq, chan); + + tasklet_kill(&chan->tasklet); + + list_del(&chan->common.device_node); +} + +/** + * xilinx_vdma_chan_probe - Per Channel Probing + * It get channel features from the device tree entry and + * initialize special channel handling routines + * + * @xdev: Driver specific device structure + * @node: Device node + * + * Return: '0' on success and failure value on error + */ +static int xilinx_vdma_chan_probe(struct xilinx_vdma_device *xdev, + struct device_node *node) +{ + struct xilinx_vdma_chan *chan; + bool has_dre = false; + u32 value, width; + int err; + + /* Allocate and initialize the channel structure */ + chan = devm_kzalloc(xdev->dev, sizeof(*chan), GFP_KERNEL); + if (!chan) + return -ENOMEM; + + chan->dev = xdev->dev; + chan->xdev = xdev; + chan->has_sg = xdev->has_sg; + + spin_lock_init(&chan->lock); + INIT_LIST_HEAD(&chan->pending_list); + INIT_LIST_HEAD(&chan->done_list); + + /* Retrieve the channel properties from the device tree */ + has_dre = of_property_read_bool(node, "xlnx,include-dre"); + + chan->genlock = of_property_read_bool(node, "xlnx,genlock-mode"); + + err = of_property_read_u32(node, "xlnx,datawidth", &value); + if (err) { + dev_err(xdev->dev, "missing xlnx,datawidth property\n"); + return err; + } + width = value >> 3; /* Convert bits to bytes */ + + /* If data width is greater than 8 bytes, DRE is not in hw */ + if (width > 8) + has_dre = false; + + if (!has_dre) + xdev->common.copy_align = fls(width - 1); + + if (of_device_is_compatible(node, "xlnx,axi-vdma-mm2s-channel")) { + chan->direction = DMA_MEM_TO_DEV; + chan->id = 0; + + chan->ctrl_offset = XILINX_VDMA_MM2S_CTRL_OFFSET; + chan->desc_offset = XILINX_VDMA_MM2S_DESC_OFFSET; + + if (xdev->flush_on_fsync == XILINX_VDMA_FLUSH_BOTH || + xdev->flush_on_fsync == XILINX_VDMA_FLUSH_MM2S) + chan->flush_on_fsync = true; + } else if (of_device_is_compatible(node, + "xlnx,axi-vdma-s2mm-channel")) { + chan->direction = DMA_DEV_TO_MEM; + chan->id = 1; + + chan->ctrl_offset = XILINX_VDMA_S2MM_CTRL_OFFSET; + chan->desc_offset = XILINX_VDMA_S2MM_DESC_OFFSET; + + if (xdev->flush_on_fsync == XILINX_VDMA_FLUSH_BOTH || + xdev->flush_on_fsync == XILINX_VDMA_FLUSH_S2MM) + chan->flush_on_fsync = true; + } else { + dev_err(xdev->dev, "Invalid channel compatible node\n"); + return -EINVAL; + } + + /* Request the interrupt */ + chan->irq = irq_of_parse_and_map(node, 0); + err = request_irq(chan->irq, xilinx_vdma_irq_handler, IRQF_SHARED, + "xilinx-vdma-controller", chan); + if (err) { + dev_err(xdev->dev, "unable to request IRQ %d\n", chan->irq); + return err; + } + + /* Initialize the tasklet */ + tasklet_init(&chan->tasklet, xilinx_vdma_do_tasklet, + (unsigned long)chan); + + /* + * Initialize the DMA channel and add it to the DMA engine channels + * list. + */ + chan->common.device = &xdev->common; + + list_add_tail(&chan->common.device_node, &xdev->common.channels); + xdev->chan[chan->id] = chan; + + /* Reset the channel */ + err = xilinx_vdma_chan_reset(chan); + if (err < 0) { + dev_err(xdev->dev, "Reset channel failed\n"); + return err; + } + + return 0; +} + +/** + * of_dma_xilinx_xlate - Translation function + * @dma_spec: Pointer to DMA specifier as found in the device tree + * @ofdma: Pointer to DMA controller data + * + * Return: DMA channel pointer on success and NULL on error + */ +static struct dma_chan *of_dma_xilinx_xlate(struct of_phandle_args *dma_spec, + struct of_dma *ofdma) +{ + struct xilinx_vdma_device *xdev = ofdma->of_dma_data; + int chan_id = dma_spec->args[0]; + + if (chan_id >= XILINX_VDMA_MAX_CHANS_PER_DEVICE) + return NULL; + + return dma_get_slave_channel(&xdev->chan[chan_id]->common); +} + +/** + * xilinx_vdma_probe - Driver probe function + * @pdev: Pointer to the platform_device structure + * + * Return: '0' on success and failure value on error + */ +static int xilinx_vdma_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct xilinx_vdma_device *xdev; + struct device_node *child; + struct resource *io; + u32 num_frames; + int i, err; + + /* Allocate and initialize the DMA engine structure */ + xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL); + if (!xdev) + return -ENOMEM; + + xdev->dev = &pdev->dev; + + /* Request and map I/O memory */ + io = platform_get_resource(pdev, IORESOURCE_MEM, 0); + xdev->regs = devm_ioremap_resource(&pdev->dev, io); + if (IS_ERR(xdev->regs)) + return PTR_ERR(xdev->regs); + + /* Retrieve the DMA engine properties from the device tree */ + xdev->has_sg = of_property_read_bool(node, "xlnx,include-sg"); + + err = of_property_read_u32(node, "xlnx,num-fstores", &num_frames); + if (err < 0) { + dev_err(xdev->dev, "missing xlnx,num-fstores property\n"); + return err; + } + + err = of_property_read_u32(node, "xlnx,flush-fsync", + &xdev->flush_on_fsync); + if (err < 0) + dev_warn(xdev->dev, "missing xlnx,flush-fsync property\n"); + + /* Initialize the DMA engine */ + xdev->common.dev = &pdev->dev; + + INIT_LIST_HEAD(&xdev->common.channels); + dma_cap_set(DMA_SLAVE, xdev->common.cap_mask); + dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask); + + xdev->common.device_alloc_chan_resources = + xilinx_vdma_alloc_chan_resources; + xdev->common.device_free_chan_resources = + xilinx_vdma_free_chan_resources; + xdev->common.device_prep_interleaved_dma = + xilinx_vdma_dma_prep_interleaved; + xdev->common.device_terminate_all = xilinx_vdma_terminate_all; + xdev->common.device_tx_status = xilinx_vdma_tx_status; + xdev->common.device_issue_pending = xilinx_vdma_issue_pending; + + platform_set_drvdata(pdev, xdev); + + /* Initialize the channels */ + for_each_child_of_node(node, child) { + err = xilinx_vdma_chan_probe(xdev, child); + if (err < 0) + goto error; + } + + for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++) + if (xdev->chan[i]) + xdev->chan[i]->num_frms = num_frames; + + /* Register the DMA engine with the core */ + dma_async_device_register(&xdev->common); + + err = of_dma_controller_register(node, of_dma_xilinx_xlate, + xdev); + if (err < 0) { + dev_err(&pdev->dev, "Unable to register DMA to DT\n"); + dma_async_device_unregister(&xdev->common); + goto error; + } + + dev_info(&pdev->dev, "Xilinx AXI VDMA Engine Driver Probed!!\n"); + + return 0; + +error: + for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++) + if (xdev->chan[i]) + xilinx_vdma_chan_remove(xdev->chan[i]); + + return err; +} + +/** + * xilinx_vdma_remove - Driver remove function + * @pdev: Pointer to the platform_device structure + * + * Return: Always '0' + */ +static int xilinx_vdma_remove(struct platform_device *pdev) +{ + struct xilinx_vdma_device *xdev = platform_get_drvdata(pdev); + int i; + + of_dma_controller_free(pdev->dev.of_node); + + dma_async_device_unregister(&xdev->common); + + for (i = 0; i < XILINX_VDMA_MAX_CHANS_PER_DEVICE; i++) + if (xdev->chan[i]) + xilinx_vdma_chan_remove(xdev->chan[i]); + + return 0; +} + +static const struct of_device_id xilinx_vdma_of_ids[] = { + { .compatible = "xlnx,axi-vdma-1.00.a",}, + {} +}; + +static struct platform_driver xilinx_vdma_driver = { + .driver = { + .name = "xilinx-vdma", + .of_match_table = xilinx_vdma_of_ids, + }, + .probe = xilinx_vdma_probe, + .remove = xilinx_vdma_remove, +}; + +module_platform_driver(xilinx_vdma_driver); + +MODULE_AUTHOR("Xilinx, Inc."); +MODULE_DESCRIPTION("Xilinx VDMA driver"); +MODULE_LICENSE("GPL v2"); |