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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-06-10 05:30:17 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-06-10 05:30:17 -0300
commitd635711daa98be86d4c7fd01499c34f566b54ccb (patch)
treeaa5cc3760a27c3d57146498cb82fa549547de06c /drivers/dma/qcom_bam_dma.c
parentc91265cd0efb83778f015b4d4b1129bd2cfd075e (diff)
Linux-libre 4.6.2-gnu
Diffstat (limited to 'drivers/dma/qcom_bam_dma.c')
-rw-r--r--drivers/dma/qcom_bam_dma.c1259
1 files changed, 0 insertions, 1259 deletions
diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c
deleted file mode 100644
index 5a250cdc8..000000000
--- a/drivers/dma/qcom_bam_dma.c
+++ /dev/null
@@ -1,1259 +0,0 @@
-/*
- * 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");