diff options
Diffstat (limited to 'drivers/dma/mv_xor_v2.c')
| -rw-r--r-- | drivers/dma/mv_xor_v2.c | 878 |
1 files changed, 878 insertions, 0 deletions
diff --git a/drivers/dma/mv_xor_v2.c b/drivers/dma/mv_xor_v2.c new file mode 100644 index 000000000..a28a01fcb --- /dev/null +++ b/drivers/dma/mv_xor_v2.c @@ -0,0 +1,878 @@ +/* + * Copyright (C) 2015-2016 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 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/clk.h> +#include <linux/dma-mapping.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/msi.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/spinlock.h> + +#include "dmaengine.h" + +/* DMA Engine Registers */ +#define MV_XOR_V2_DMA_DESQ_BALR_OFF 0x000 +#define MV_XOR_V2_DMA_DESQ_BAHR_OFF 0x004 +#define MV_XOR_V2_DMA_DESQ_SIZE_OFF 0x008 +#define MV_XOR_V2_DMA_DESQ_DONE_OFF 0x00C +#define MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK 0x7FFF +#define MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT 0 +#define MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_MASK 0x1FFF +#define MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_SHIFT 16 +#define MV_XOR_V2_DMA_DESQ_ARATTR_OFF 0x010 +#define MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK 0x3F3F +#define MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE 0x202 +#define MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE 0x3C3C +#define MV_XOR_V2_DMA_IMSG_CDAT_OFF 0x014 +#define MV_XOR_V2_DMA_IMSG_THRD_OFF 0x018 +#define MV_XOR_V2_DMA_IMSG_THRD_MASK 0x7FFF +#define MV_XOR_V2_DMA_IMSG_THRD_SHIFT 0x0 +#define MV_XOR_V2_DMA_DESQ_AWATTR_OFF 0x01C + /* Same flags as MV_XOR_V2_DMA_DESQ_ARATTR_OFF */ +#define MV_XOR_V2_DMA_DESQ_ALLOC_OFF 0x04C +#define MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_MASK 0xFFFF +#define MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_SHIFT 16 +#define MV_XOR_V2_DMA_IMSG_BALR_OFF 0x050 +#define MV_XOR_V2_DMA_IMSG_BAHR_OFF 0x054 +#define MV_XOR_V2_DMA_DESQ_CTRL_OFF 0x100 +#define MV_XOR_V2_DMA_DESQ_CTRL_32B 1 +#define MV_XOR_V2_DMA_DESQ_CTRL_128B 7 +#define MV_XOR_V2_DMA_DESQ_STOP_OFF 0x800 +#define MV_XOR_V2_DMA_DESQ_DEALLOC_OFF 0x804 +#define MV_XOR_V2_DMA_DESQ_ADD_OFF 0x808 + +/* XOR Global registers */ +#define MV_XOR_V2_GLOB_BW_CTRL 0x4 +#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_SHIFT 0 +#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_VAL 64 +#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_SHIFT 8 +#define MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_VAL 8 +#define MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_SHIFT 12 +#define MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_VAL 4 +#define MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_SHIFT 16 +#define MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_VAL 4 +#define MV_XOR_V2_GLOB_PAUSE 0x014 +#define MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL 0x8 +#define MV_XOR_V2_GLOB_SYS_INT_CAUSE 0x200 +#define MV_XOR_V2_GLOB_SYS_INT_MASK 0x204 +#define MV_XOR_V2_GLOB_MEM_INT_CAUSE 0x220 +#define MV_XOR_V2_GLOB_MEM_INT_MASK 0x224 + +#define MV_XOR_V2_MIN_DESC_SIZE 32 +#define MV_XOR_V2_EXT_DESC_SIZE 128 + +#define MV_XOR_V2_DESC_RESERVED_SIZE 12 +#define MV_XOR_V2_DESC_BUFF_D_ADDR_SIZE 12 + +#define MV_XOR_V2_CMD_LINE_NUM_MAX_D_BUF 8 + +/* + * Descriptors queue size. With 32 bytes descriptors, up to 2^14 + * descriptors are allowed, with 128 bytes descriptors, up to 2^12 + * descriptors are allowed. This driver uses 128 bytes descriptors, + * but experimentation has shown that a set of 1024 descriptors is + * sufficient to reach a good level of performance. + */ +#define MV_XOR_V2_DESC_NUM 1024 + +/** + * struct mv_xor_v2_descriptor - DMA HW descriptor + * @desc_id: used by S/W and is not affected by H/W. + * @flags: error and status flags + * @crc32_result: CRC32 calculation result + * @desc_ctrl: operation mode and control flags + * @buff_size: amount of bytes to be processed + * @fill_pattern_src_addr: Fill-Pattern or Source-Address and + * AW-Attributes + * @data_buff_addr: Source (and might be RAID6 destination) + * addresses of data buffers in RAID5 and RAID6 + * @reserved: reserved + */ +struct mv_xor_v2_descriptor { + u16 desc_id; + u16 flags; + u32 crc32_result; + u32 desc_ctrl; + + /* Definitions for desc_ctrl */ +#define DESC_NUM_ACTIVE_D_BUF_SHIFT 22 +#define DESC_OP_MODE_SHIFT 28 +#define DESC_OP_MODE_NOP 0 /* Idle operation */ +#define DESC_OP_MODE_MEMCPY 1 /* Pure-DMA operation */ +#define DESC_OP_MODE_MEMSET 2 /* Mem-Fill operation */ +#define DESC_OP_MODE_MEMINIT 3 /* Mem-Init operation */ +#define DESC_OP_MODE_MEM_COMPARE 4 /* Mem-Compare operation */ +#define DESC_OP_MODE_CRC32 5 /* CRC32 calculation */ +#define DESC_OP_MODE_XOR 6 /* RAID5 (XOR) operation */ +#define DESC_OP_MODE_RAID6 7 /* RAID6 P&Q-generation */ +#define DESC_OP_MODE_RAID6_REC 8 /* RAID6 Recovery */ +#define DESC_Q_BUFFER_ENABLE BIT(16) +#define DESC_P_BUFFER_ENABLE BIT(17) +#define DESC_IOD BIT(27) + + u32 buff_size; + u32 fill_pattern_src_addr[4]; + u32 data_buff_addr[MV_XOR_V2_DESC_BUFF_D_ADDR_SIZE]; + u32 reserved[MV_XOR_V2_DESC_RESERVED_SIZE]; +}; + +/** + * struct mv_xor_v2_device - implements a xor device + * @lock: lock for the engine + * @dma_base: memory mapped DMA register base + * @glob_base: memory mapped global register base + * @irq_tasklet: + * @free_sw_desc: linked list of free SW descriptors + * @dmadev: dma device + * @dmachan: dma channel + * @hw_desq: HW descriptors queue + * @hw_desq_virt: virtual address of DESCQ + * @sw_desq: SW descriptors queue + * @desc_size: HW descriptor size + * @npendings: number of pending descriptors (for which tx_submit has + * been called, but not yet issue_pending) + */ +struct mv_xor_v2_device { + spinlock_t lock; + void __iomem *dma_base; + void __iomem *glob_base; + struct clk *clk; + struct tasklet_struct irq_tasklet; + struct list_head free_sw_desc; + struct dma_device dmadev; + struct dma_chan dmachan; + dma_addr_t hw_desq; + struct mv_xor_v2_descriptor *hw_desq_virt; + struct mv_xor_v2_sw_desc *sw_desq; + int desc_size; + unsigned int npendings; +}; + +/** + * struct mv_xor_v2_sw_desc - implements a xor SW descriptor + * @idx: descriptor index + * @async_tx: support for the async_tx api + * @hw_desc: assosiated HW descriptor + * @free_list: node of the free SW descriprots list +*/ +struct mv_xor_v2_sw_desc { + int idx; + struct dma_async_tx_descriptor async_tx; + struct mv_xor_v2_descriptor hw_desc; + struct list_head free_list; +}; + +/* + * Fill the data buffers to a HW descriptor + */ +static void mv_xor_v2_set_data_buffers(struct mv_xor_v2_device *xor_dev, + struct mv_xor_v2_descriptor *desc, + dma_addr_t src, int index) +{ + int arr_index = ((index >> 1) * 3); + + /* + * Fill the buffer's addresses to the descriptor. + * + * The format of the buffers address for 2 sequential buffers + * X and X + 1: + * + * First word: Buffer-DX-Address-Low[31:0] + * Second word: Buffer-DX+1-Address-Low[31:0] + * Third word: DX+1-Buffer-Address-High[47:32] [31:16] + * DX-Buffer-Address-High[47:32] [15:0] + */ + if ((index & 0x1) == 0) { + desc->data_buff_addr[arr_index] = lower_32_bits(src); + + desc->data_buff_addr[arr_index + 2] &= ~0xFFFF; + desc->data_buff_addr[arr_index + 2] |= + upper_32_bits(src) & 0xFFFF; + } else { + desc->data_buff_addr[arr_index + 1] = + lower_32_bits(src); + + desc->data_buff_addr[arr_index + 2] &= ~0xFFFF0000; + desc->data_buff_addr[arr_index + 2] |= + (upper_32_bits(src) & 0xFFFF) << 16; + } +} + +/* + * Return the next available index in the DESQ. + */ +static int mv_xor_v2_get_desq_write_ptr(struct mv_xor_v2_device *xor_dev) +{ + /* read the index for the next available descriptor in the DESQ */ + u32 reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ALLOC_OFF); + + return ((reg >> MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_SHIFT) + & MV_XOR_V2_DMA_DESQ_ALLOC_WRPTR_MASK); +} + +/* + * notify the engine of new descriptors, and update the available index. + */ +static void mv_xor_v2_add_desc_to_desq(struct mv_xor_v2_device *xor_dev, + int num_of_desc) +{ + /* write the number of new descriptors in the DESQ. */ + writel(num_of_desc, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ADD_OFF); +} + +/* + * free HW descriptors + */ +static void mv_xor_v2_free_desc_from_desq(struct mv_xor_v2_device *xor_dev, + int num_of_desc) +{ + /* write the number of new descriptors in the DESQ. */ + writel(num_of_desc, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DEALLOC_OFF); +} + +/* + * Set descriptor size + * Return the HW descriptor size in bytes + */ +static int mv_xor_v2_set_desc_size(struct mv_xor_v2_device *xor_dev) +{ + writel(MV_XOR_V2_DMA_DESQ_CTRL_128B, + xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_CTRL_OFF); + + return MV_XOR_V2_EXT_DESC_SIZE; +} + +/* + * Set the IMSG threshold + */ +static inline +void mv_xor_v2_set_imsg_thrd(struct mv_xor_v2_device *xor_dev, int thrd_val) +{ + u32 reg; + + reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF); + + reg &= (~MV_XOR_V2_DMA_IMSG_THRD_MASK << MV_XOR_V2_DMA_IMSG_THRD_SHIFT); + reg |= (thrd_val << MV_XOR_V2_DMA_IMSG_THRD_SHIFT); + + writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_THRD_OFF); +} + +static irqreturn_t mv_xor_v2_interrupt_handler(int irq, void *data) +{ + struct mv_xor_v2_device *xor_dev = data; + unsigned int ndescs; + u32 reg; + + reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DONE_OFF); + + ndescs = ((reg >> MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT) & + MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK); + + /* No descriptors to process */ + if (!ndescs) + return IRQ_NONE; + + /* + * Update IMSG threshold, to disable new IMSG interrupts until + * end of the tasklet + */ + mv_xor_v2_set_imsg_thrd(xor_dev, MV_XOR_V2_DESC_NUM); + + /* schedule a tasklet to handle descriptors callbacks */ + tasklet_schedule(&xor_dev->irq_tasklet); + + return IRQ_HANDLED; +} + +/* + * submit a descriptor to the DMA engine + */ +static dma_cookie_t +mv_xor_v2_tx_submit(struct dma_async_tx_descriptor *tx) +{ + int desq_ptr; + void *dest_hw_desc; + dma_cookie_t cookie; + struct mv_xor_v2_sw_desc *sw_desc = + container_of(tx, struct mv_xor_v2_sw_desc, async_tx); + struct mv_xor_v2_device *xor_dev = + container_of(tx->chan, struct mv_xor_v2_device, dmachan); + + dev_dbg(xor_dev->dmadev.dev, + "%s sw_desc %p: async_tx %p\n", + __func__, sw_desc, &sw_desc->async_tx); + + /* assign coookie */ + spin_lock_bh(&xor_dev->lock); + cookie = dma_cookie_assign(tx); + + /* get the next available slot in the DESQ */ + desq_ptr = mv_xor_v2_get_desq_write_ptr(xor_dev); + + /* copy the HW descriptor from the SW descriptor to the DESQ */ + dest_hw_desc = xor_dev->hw_desq_virt + desq_ptr; + + memcpy(dest_hw_desc, &sw_desc->hw_desc, xor_dev->desc_size); + + xor_dev->npendings++; + + spin_unlock_bh(&xor_dev->lock); + + return cookie; +} + +/* + * Prepare a SW descriptor + */ +static struct mv_xor_v2_sw_desc * +mv_xor_v2_prep_sw_desc(struct mv_xor_v2_device *xor_dev) +{ + struct mv_xor_v2_sw_desc *sw_desc; + + /* Lock the channel */ + spin_lock_bh(&xor_dev->lock); + + if (list_empty(&xor_dev->free_sw_desc)) { + spin_unlock_bh(&xor_dev->lock); + /* schedule tasklet to free some descriptors */ + tasklet_schedule(&xor_dev->irq_tasklet); + return NULL; + } + + /* get a free SW descriptor from the SW DESQ */ + sw_desc = list_first_entry(&xor_dev->free_sw_desc, + struct mv_xor_v2_sw_desc, free_list); + list_del(&sw_desc->free_list); + + /* Release the channel */ + spin_unlock_bh(&xor_dev->lock); + + /* set the async tx descriptor */ + dma_async_tx_descriptor_init(&sw_desc->async_tx, &xor_dev->dmachan); + sw_desc->async_tx.tx_submit = mv_xor_v2_tx_submit; + async_tx_ack(&sw_desc->async_tx); + + return sw_desc; +} + +/* + * Prepare a HW descriptor for a memcpy operation + */ +static struct dma_async_tx_descriptor * +mv_xor_v2_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, + dma_addr_t src, size_t len, unsigned long flags) +{ + struct mv_xor_v2_sw_desc *sw_desc; + struct mv_xor_v2_descriptor *hw_descriptor; + struct mv_xor_v2_device *xor_dev; + + xor_dev = container_of(chan, struct mv_xor_v2_device, dmachan); + + dev_dbg(xor_dev->dmadev.dev, + "%s len: %zu src %pad dest %pad flags: %ld\n", + __func__, len, &src, &dest, flags); + + sw_desc = mv_xor_v2_prep_sw_desc(xor_dev); + + sw_desc->async_tx.flags = flags; + + /* set the HW descriptor */ + hw_descriptor = &sw_desc->hw_desc; + + /* save the SW descriptor ID to restore when operation is done */ + hw_descriptor->desc_id = sw_desc->idx; + + /* Set the MEMCPY control word */ + hw_descriptor->desc_ctrl = + DESC_OP_MODE_MEMCPY << DESC_OP_MODE_SHIFT; + + if (flags & DMA_PREP_INTERRUPT) + hw_descriptor->desc_ctrl |= DESC_IOD; + + /* Set source address */ + hw_descriptor->fill_pattern_src_addr[0] = lower_32_bits(src); + hw_descriptor->fill_pattern_src_addr[1] = + upper_32_bits(src) & 0xFFFF; + + /* Set Destination address */ + hw_descriptor->fill_pattern_src_addr[2] = lower_32_bits(dest); + hw_descriptor->fill_pattern_src_addr[3] = + upper_32_bits(dest) & 0xFFFF; + + /* Set buffers size */ + hw_descriptor->buff_size = len; + + /* return the async tx descriptor */ + return &sw_desc->async_tx; +} + +/* + * Prepare a HW descriptor for a XOR operation + */ +static struct dma_async_tx_descriptor * +mv_xor_v2_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_v2_sw_desc *sw_desc; + struct mv_xor_v2_descriptor *hw_descriptor; + struct mv_xor_v2_device *xor_dev = + container_of(chan, struct mv_xor_v2_device, dmachan); + int i; + + if (src_cnt > MV_XOR_V2_CMD_LINE_NUM_MAX_D_BUF || src_cnt < 1) + return NULL; + + dev_dbg(xor_dev->dmadev.dev, + "%s src_cnt: %d len: %zu dest %pad flags: %ld\n", + __func__, src_cnt, len, &dest, flags); + + sw_desc = mv_xor_v2_prep_sw_desc(xor_dev); + + sw_desc->async_tx.flags = flags; + + /* set the HW descriptor */ + hw_descriptor = &sw_desc->hw_desc; + + /* save the SW descriptor ID to restore when operation is done */ + hw_descriptor->desc_id = sw_desc->idx; + + /* Set the XOR control word */ + hw_descriptor->desc_ctrl = + DESC_OP_MODE_XOR << DESC_OP_MODE_SHIFT; + hw_descriptor->desc_ctrl |= DESC_P_BUFFER_ENABLE; + + if (flags & DMA_PREP_INTERRUPT) + hw_descriptor->desc_ctrl |= DESC_IOD; + + /* Set the data buffers */ + for (i = 0; i < src_cnt; i++) + mv_xor_v2_set_data_buffers(xor_dev, hw_descriptor, src[i], i); + + hw_descriptor->desc_ctrl |= + src_cnt << DESC_NUM_ACTIVE_D_BUF_SHIFT; + + /* Set Destination address */ + hw_descriptor->fill_pattern_src_addr[2] = lower_32_bits(dest); + hw_descriptor->fill_pattern_src_addr[3] = + upper_32_bits(dest) & 0xFFFF; + + /* Set buffers size */ + hw_descriptor->buff_size = len; + + /* return the async tx descriptor */ + return &sw_desc->async_tx; +} + +/* + * Prepare a HW descriptor for interrupt operation. + */ +static struct dma_async_tx_descriptor * +mv_xor_v2_prep_dma_interrupt(struct dma_chan *chan, unsigned long flags) +{ + struct mv_xor_v2_sw_desc *sw_desc; + struct mv_xor_v2_descriptor *hw_descriptor; + struct mv_xor_v2_device *xor_dev = + container_of(chan, struct mv_xor_v2_device, dmachan); + + sw_desc = mv_xor_v2_prep_sw_desc(xor_dev); + + /* set the HW descriptor */ + hw_descriptor = &sw_desc->hw_desc; + + /* save the SW descriptor ID to restore when operation is done */ + hw_descriptor->desc_id = sw_desc->idx; + + /* Set the INTERRUPT control word */ + hw_descriptor->desc_ctrl = + DESC_OP_MODE_NOP << DESC_OP_MODE_SHIFT; + hw_descriptor->desc_ctrl |= DESC_IOD; + + /* return the async tx descriptor */ + return &sw_desc->async_tx; +} + +/* + * push pending transactions to hardware + */ +static void mv_xor_v2_issue_pending(struct dma_chan *chan) +{ + struct mv_xor_v2_device *xor_dev = + container_of(chan, struct mv_xor_v2_device, dmachan); + + spin_lock_bh(&xor_dev->lock); + + /* + * update the engine with the number of descriptors to + * process + */ + mv_xor_v2_add_desc_to_desq(xor_dev, xor_dev->npendings); + xor_dev->npendings = 0; + + /* Activate the channel */ + writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF); + + spin_unlock_bh(&xor_dev->lock); +} + +static inline +int mv_xor_v2_get_pending_params(struct mv_xor_v2_device *xor_dev, + int *pending_ptr) +{ + u32 reg; + + reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_DONE_OFF); + + /* get the next pending descriptor index */ + *pending_ptr = ((reg >> MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_SHIFT) & + MV_XOR_V2_DMA_DESQ_DONE_READ_PTR_MASK); + + /* get the number of descriptors pending handle */ + return ((reg >> MV_XOR_V2_DMA_DESQ_DONE_PENDING_SHIFT) & + MV_XOR_V2_DMA_DESQ_DONE_PENDING_MASK); +} + +/* + * handle the descriptors after HW process + */ +static void mv_xor_v2_tasklet(unsigned long data) +{ + struct mv_xor_v2_device *xor_dev = (struct mv_xor_v2_device *) data; + int pending_ptr, num_of_pending, i; + struct mv_xor_v2_descriptor *next_pending_hw_desc = NULL; + struct mv_xor_v2_sw_desc *next_pending_sw_desc = NULL; + + dev_dbg(xor_dev->dmadev.dev, "%s %d\n", __func__, __LINE__); + + /* get the pending descriptors parameters */ + num_of_pending = mv_xor_v2_get_pending_params(xor_dev, &pending_ptr); + + /* next HW descriptor */ + next_pending_hw_desc = xor_dev->hw_desq_virt + pending_ptr; + + /* loop over free descriptors */ + for (i = 0; i < num_of_pending; i++) { + + if (pending_ptr > MV_XOR_V2_DESC_NUM) + pending_ptr = 0; + + if (next_pending_sw_desc != NULL) + next_pending_hw_desc++; + + /* get the SW descriptor related to the HW descriptor */ + next_pending_sw_desc = + &xor_dev->sw_desq[next_pending_hw_desc->desc_id]; + + /* call the callback */ + if (next_pending_sw_desc->async_tx.cookie > 0) { + /* + * update the channel's completed cookie - no + * lock is required the IMSG threshold provide + * the locking + */ + dma_cookie_complete(&next_pending_sw_desc->async_tx); + + if (next_pending_sw_desc->async_tx.callback) + next_pending_sw_desc->async_tx.callback( + next_pending_sw_desc->async_tx.callback_param); + + dma_descriptor_unmap(&next_pending_sw_desc->async_tx); + } + + dma_run_dependencies(&next_pending_sw_desc->async_tx); + + /* Lock the channel */ + spin_lock_bh(&xor_dev->lock); + + /* add the SW descriptor to the free descriptors list */ + list_add(&next_pending_sw_desc->free_list, + &xor_dev->free_sw_desc); + + /* Release the channel */ + spin_unlock_bh(&xor_dev->lock); + + /* increment the next descriptor */ + pending_ptr++; + } + + if (num_of_pending != 0) { + /* free the descriptores */ + mv_xor_v2_free_desc_from_desq(xor_dev, num_of_pending); + } + + /* Update IMSG threshold, to enable new IMSG interrupts */ + mv_xor_v2_set_imsg_thrd(xor_dev, 0); +} + +/* + * Set DMA Interrupt-message (IMSG) parameters + */ +static void mv_xor_v2_set_msi_msg(struct msi_desc *desc, struct msi_msg *msg) +{ + struct mv_xor_v2_device *xor_dev = dev_get_drvdata(desc->dev); + + writel(msg->address_lo, + xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_BALR_OFF); + writel(msg->address_hi & 0xFFFF, + xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_BAHR_OFF); + writel(msg->data, + xor_dev->dma_base + MV_XOR_V2_DMA_IMSG_CDAT_OFF); +} + +static int mv_xor_v2_descq_init(struct mv_xor_v2_device *xor_dev) +{ + u32 reg; + + /* write the DESQ size to the DMA engine */ + writel(MV_XOR_V2_DESC_NUM, + xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_SIZE_OFF); + + /* write the DESQ address to the DMA enngine*/ + writel(xor_dev->hw_desq & 0xFFFFFFFF, + xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BALR_OFF); + writel((xor_dev->hw_desq & 0xFFFF00000000) >> 32, + xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_BAHR_OFF); + + /* enable the DMA engine */ + writel(0, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_STOP_OFF); + + /* + * This is a temporary solution, until we activate the + * SMMU. Set the attributes for reading & writing data buffers + * & descriptors to: + * + * - OuterShareable - Snoops will be performed on CPU caches + * - Enable cacheable - Bufferable, Modifiable, Other Allocate + * and Allocate + */ + reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ARATTR_OFF); + reg &= ~MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK; + reg |= MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE | + MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE; + writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_ARATTR_OFF); + + reg = readl(xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_AWATTR_OFF); + reg &= ~MV_XOR_V2_DMA_DESQ_ATTR_CACHE_MASK; + reg |= MV_XOR_V2_DMA_DESQ_ATTR_OUTER_SHAREABLE | + MV_XOR_V2_DMA_DESQ_ATTR_CACHEABLE; + writel(reg, xor_dev->dma_base + MV_XOR_V2_DMA_DESQ_AWATTR_OFF); + + /* BW CTRL - set values to optimize the XOR performance: + * + * - Set WrBurstLen & RdBurstLen - the unit will issue + * maximum of 256B write/read transactions. + * - Limit the number of outstanding write & read data + * (OBB/IBB) requests to the maximal value. + */ + reg = ((MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_VAL << + MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_RD_SHIFT) | + (MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_VAL << + MV_XOR_V2_GLOB_BW_CTRL_NUM_OSTD_WR_SHIFT) | + (MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_VAL << + MV_XOR_V2_GLOB_BW_CTRL_RD_BURST_LEN_SHIFT) | + (MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_VAL << + MV_XOR_V2_GLOB_BW_CTRL_WR_BURST_LEN_SHIFT)); + writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_BW_CTRL); + + /* Disable the AXI timer feature */ + reg = readl(xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE); + reg |= MV_XOR_V2_GLOB_PAUSE_AXI_TIME_DIS_VAL; + writel(reg, xor_dev->glob_base + MV_XOR_V2_GLOB_PAUSE); + + return 0; +} + +static int mv_xor_v2_probe(struct platform_device *pdev) +{ + struct mv_xor_v2_device *xor_dev; + struct resource *res; + int i, ret = 0; + struct dma_device *dma_dev; + struct mv_xor_v2_sw_desc *sw_desc; + struct msi_desc *msi_desc; + + BUILD_BUG_ON(sizeof(struct mv_xor_v2_descriptor) != + MV_XOR_V2_EXT_DESC_SIZE); + + xor_dev = devm_kzalloc(&pdev->dev, sizeof(*xor_dev), GFP_KERNEL); + if (!xor_dev) + return -ENOMEM; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + xor_dev->dma_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(xor_dev->dma_base)) + return PTR_ERR(xor_dev->dma_base); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 1); + xor_dev->glob_base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(xor_dev->glob_base)) + return PTR_ERR(xor_dev->glob_base); + + platform_set_drvdata(pdev, xor_dev); + + xor_dev->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(xor_dev->clk) && PTR_ERR(xor_dev->clk) == -EPROBE_DEFER) + return -EPROBE_DEFER; + if (!IS_ERR(xor_dev->clk)) { + ret = clk_prepare_enable(xor_dev->clk); + if (ret) + return ret; + } + + ret = platform_msi_domain_alloc_irqs(&pdev->dev, 1, + mv_xor_v2_set_msi_msg); + if (ret) + goto disable_clk; + + msi_desc = first_msi_entry(&pdev->dev); + if (!msi_desc) + goto free_msi_irqs; + + ret = devm_request_irq(&pdev->dev, msi_desc->irq, + mv_xor_v2_interrupt_handler, 0, + dev_name(&pdev->dev), xor_dev); + if (ret) + goto free_msi_irqs; + + tasklet_init(&xor_dev->irq_tasklet, mv_xor_v2_tasklet, + (unsigned long) xor_dev); + + xor_dev->desc_size = mv_xor_v2_set_desc_size(xor_dev); + + dma_cookie_init(&xor_dev->dmachan); + + /* + * allocate coherent memory for hardware descriptors + * note: writecombine gives slightly better performance, but + * requires that we explicitly flush the writes + */ + xor_dev->hw_desq_virt = + dma_alloc_coherent(&pdev->dev, + xor_dev->desc_size * MV_XOR_V2_DESC_NUM, + &xor_dev->hw_desq, GFP_KERNEL); + if (!xor_dev->hw_desq_virt) { + ret = -ENOMEM; + goto free_msi_irqs; + } + + /* alloc memory for the SW descriptors */ + xor_dev->sw_desq = devm_kzalloc(&pdev->dev, sizeof(*sw_desc) * + MV_XOR_V2_DESC_NUM, GFP_KERNEL); + if (!xor_dev->sw_desq) { + ret = -ENOMEM; + goto free_hw_desq; + } + + spin_lock_init(&xor_dev->lock); + + /* init the free SW descriptors list */ + INIT_LIST_HEAD(&xor_dev->free_sw_desc); + + /* add all SW descriptors to the free list */ + for (i = 0; i < MV_XOR_V2_DESC_NUM; i++) { + xor_dev->sw_desq[i].idx = i; + list_add(&xor_dev->sw_desq[i].free_list, + &xor_dev->free_sw_desc); + } + + dma_dev = &xor_dev->dmadev; + + /* set DMA capabilities */ + dma_cap_zero(dma_dev->cap_mask); + dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); + dma_cap_set(DMA_XOR, dma_dev->cap_mask); + dma_cap_set(DMA_INTERRUPT, dma_dev->cap_mask); + + /* init dma link list */ + INIT_LIST_HEAD(&dma_dev->channels); + + /* set base routines */ + dma_dev->device_tx_status = dma_cookie_status; + dma_dev->device_issue_pending = mv_xor_v2_issue_pending; + dma_dev->dev = &pdev->dev; + + dma_dev->device_prep_dma_memcpy = mv_xor_v2_prep_dma_memcpy; + dma_dev->device_prep_dma_interrupt = mv_xor_v2_prep_dma_interrupt; + dma_dev->max_xor = 8; + dma_dev->device_prep_dma_xor = mv_xor_v2_prep_dma_xor; + + xor_dev->dmachan.device = dma_dev; + + list_add_tail(&xor_dev->dmachan.device_node, + &dma_dev->channels); + + mv_xor_v2_descq_init(xor_dev); + + ret = dma_async_device_register(dma_dev); + if (ret) + goto free_hw_desq; + + dev_notice(&pdev->dev, "Marvell Version 2 XOR driver\n"); + + return 0; + +free_hw_desq: + dma_free_coherent(&pdev->dev, + xor_dev->desc_size * MV_XOR_V2_DESC_NUM, + xor_dev->hw_desq_virt, xor_dev->hw_desq); +free_msi_irqs: + platform_msi_domain_free_irqs(&pdev->dev); +disable_clk: + if (!IS_ERR(xor_dev->clk)) + clk_disable_unprepare(xor_dev->clk); + return ret; +} + +static int mv_xor_v2_remove(struct platform_device *pdev) +{ + struct mv_xor_v2_device *xor_dev = platform_get_drvdata(pdev); + + dma_async_device_unregister(&xor_dev->dmadev); + + dma_free_coherent(&pdev->dev, + xor_dev->desc_size * MV_XOR_V2_DESC_NUM, + xor_dev->hw_desq_virt, xor_dev->hw_desq); + + platform_msi_domain_free_irqs(&pdev->dev); + + clk_disable_unprepare(xor_dev->clk); + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id mv_xor_v2_dt_ids[] = { + { .compatible = "marvell,xor-v2", }, + {}, +}; +MODULE_DEVICE_TABLE(of, mv_xor_v2_dt_ids); +#endif + +static struct platform_driver mv_xor_v2_driver = { + .probe = mv_xor_v2_probe, + .remove = mv_xor_v2_remove, + .driver = { + .name = "mv_xor_v2", + .of_match_table = of_match_ptr(mv_xor_v2_dt_ids), + }, +}; + +module_platform_driver(mv_xor_v2_driver); + +MODULE_DESCRIPTION("DMA engine driver for Marvell's Version 2 of XOR engine"); +MODULE_LICENSE("GPL"); |