[PATCH 06/11] dma: Drop JZ4740 driver

Paul Cercueil
2019-07-25T22:02:10Z

The newer and better JZ4780 driver is now used to provide DMA
functionality on the JZ4740.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---
drivers/dma/Kconfig | 6 -
drivers/dma/Makefile | 1 -
drivers/dma/dma-jz4740.c | 623 ---------------------------------------
3 files changed, 630 deletions(-)
delete mode 100644 drivers/dma/dma-jz4740.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 03fa0c58cef3..7dd9831b4e6e 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -137,12 +137,6 @@ config DMA_BCM2835
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS

-config DMA_JZ4740
- tristate "JZ4740 DMA support"
- depends on MACH_JZ4740 || COMPILE_TEST
- select DMA_ENGINE
- select DMA_VIRTUAL_CHANNELS
-
config DMA_JZ4780
tristate "JZ4780 DMA support"
depends on MIPS || COMPILE_TEST
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 5bddf6f8790f..f5ce8665e944 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -22,7 +22,6 @@ obj-$(CONFIG_AXI_DMAC) += dma-axi-dmac.o
obj-$(CONFIG_BCM_SBA_RAID) += bcm-sba-raid.o
obj-$(CONFIG_COH901318) += coh901318.o coh901318_lli.o
obj-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o
-obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o
obj-$(CONFIG_DMA_JZ4780) += dma-jz4780.o
obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o
obj-$(CONFIG_DMA_SUN4I) += sun4i-dma.o
diff --git a/drivers/dma/dma-jz4740.c b/drivers/dma/dma-jz4740.c
deleted file mode 100644
index 39c676c47082..000000000000
--- a/drivers/dma/dma-jz4740.c
+++ /dev/null
@@ -1,623 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2013, Lars-Peter Clausen <lars@metafoo.de>
- * JZ4740 DMAC support
- */
-
-#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 "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;
- struct dma_slave_config config;
-
- 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_write(struct dma_chan *c,
- struct dma_slave_config *config,
- enum dma_transfer_direction direction)
-{
- 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 (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_slave_config(struct dma_chan *c,
- struct dma_slave_config *config)
-{
- struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-
- memcpy(&chan->config, config, sizeof(*config));
- 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;
-
- jz4740_dma_slave_config_write(c, &chan->config, direction);
-
- 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;
-
- jz4740_dma_slave_config_write(c, &chan->config, direction);
-
- 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)
- goto err_clk;
-
- 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);
-err_clk:
- clk_disable_unprepare(dmadev->clk);
- return ret;
-}
-
-static void jz4740_cleanup_vchan(struct dma_device *dmadev)
-{
- struct jz4740_dmaengine_chan *chan, *_chan;
-
- list_for_each_entry_safe(chan, _chan,
- &dmadev->channels, vchan.chan.device_node) {
- list_del(&chan->vchan.chan.device_node);
- tasklet_kill(&chan->vchan.task);
- }
-}
-
-
-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);
-
- jz4740_cleanup_vchan(&dmadev->ddev);
- 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");
--
2.21.0.593.g511ec345e18