+++ /dev/null
-/*
- * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
- * JZ4740 SoC DMA 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.
- *
- * 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/kernel.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/clk.h>
-#include <linux/interrupt.h>
-
-#include <linux/dma-mapping.h>
-#include <asm/mach-jz4740/dma.h>
-#include <asm/mach-jz4740/base.h>
-
-#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)
-
-
-static void __iomem *jz4740_dma_base;
-static spinlock_t jz4740_dma_lock;
-
-static inline uint32_t jz4740_dma_read(size_t reg)
-{
- return readl(jz4740_dma_base + reg);
-}
-
-static inline void jz4740_dma_write(size_t reg, uint32_t val)
-{
- writel(val, jz4740_dma_base + reg);
-}
-
-static inline void jz4740_dma_write_mask(size_t reg, uint32_t val, uint32_t mask)
-{
- uint32_t val2;
- val2 = jz4740_dma_read(reg);
- val2 &= ~mask;
- val2 |= val;
- jz4740_dma_write(reg, val2);
-}
-
-struct jz4740_dma_chan {
- unsigned int id;
- void *dev;
- const char *name;
-
- enum jz4740_dma_flags flags;
- uint32_t transfer_shift;
-
- jz4740_dma_complete_callback_t complete_cb;
-
- unsigned used:1;
-};
-
-#define JZ4740_DMA_CHANNEL(_id) { .id = _id }
-
-struct jz4740_dma_chan jz4740_dma_channels[] = {
- JZ4740_DMA_CHANNEL(0),
- JZ4740_DMA_CHANNEL(1),
- JZ4740_DMA_CHANNEL(2),
- JZ4740_DMA_CHANNEL(3),
- JZ4740_DMA_CHANNEL(4),
- JZ4740_DMA_CHANNEL(5),
-};
-
-struct jz4740_dma_chan *jz4740_dma_request(void *dev, const char *name)
-{
- unsigned int i;
- struct jz4740_dma_chan *dma = NULL;
-
- spin_lock(&jz4740_dma_lock);
-
- for (i = 0; i < ARRAY_SIZE(jz4740_dma_channels); ++i) {
- if (!jz4740_dma_channels[i].used) {
- dma = &jz4740_dma_channels[i];
- dma->used = 1;
- break;
- }
- }
-
- spin_unlock(&jz4740_dma_lock);
-
- if (!dma)
- return NULL;
-
- dma->dev = dev;
- dma->name = name;
-
- return dma;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_request);
-
-void jz4740_dma_configure(struct jz4740_dma_chan *dma,
- const struct jz4740_dma_config *config)
-{
- uint32_t cmd;
-
- switch (config->transfer_size) {
- case JZ4740_DMA_TRANSFER_SIZE_2BYTE:
- dma->transfer_shift = 1;
- break;
- case JZ4740_DMA_TRANSFER_SIZE_4BYTE:
- dma->transfer_shift = 2;
- break;
- case JZ4740_DMA_TRANSFER_SIZE_16BYTE:
- dma->transfer_shift = 4;
- break;
- case JZ4740_DMA_TRANSFER_SIZE_32BYTE:
- dma->transfer_shift = 5;
- break;
- default:
- dma->transfer_shift = 0;
- break;
- }
-
- cmd = config->flags << JZ_DMA_CMD_FLAGS_OFFSET;
- cmd |= config->src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET;
- cmd |= config->dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET;
- cmd |= config->transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET;
- cmd |= config->mode << JZ_DMA_CMD_MODE_OFFSET;
- cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE;
-
- jz4740_dma_write(JZ_REG_DMA_CMD(dma->id), cmd);
- jz4740_dma_write(JZ_REG_DMA_STATUS_CTRL(dma->id), 0);
- jz4740_dma_write(JZ_REG_DMA_REQ_TYPE(dma->id), config->request_type);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_configure);
-
-void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src)
-{
- jz4740_dma_write(JZ_REG_DMA_SRC_ADDR(dma->id), src);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_src_addr);
-
-void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst)
-{
- jz4740_dma_write(JZ_REG_DMA_DST_ADDR(dma->id), dst);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_dst_addr);
-
-void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count)
-{
- count >>= dma->transfer_shift;
- jz4740_dma_write(JZ_REG_DMA_TRANSFER_COUNT(dma->id), count);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_transfer_count);
-
-void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma,
- jz4740_dma_complete_callback_t cb)
-{
- dma->complete_cb = cb;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_set_complete_cb);
-
-void jz4740_dma_free(struct jz4740_dma_chan *dma)
-{
- dma->dev = NULL;
- dma->complete_cb = NULL;
- dma->used = 0;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_free);
-
-void jz4740_dma_enable(struct jz4740_dma_chan *dma)
-{
- jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->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(JZ_REG_DMA_CTRL,
- JZ_DMA_CTRL_ENABLE,
- JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_enable);
-
-void jz4740_dma_disable(struct jz4740_dma_chan *dma)
-{
- jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
- JZ_DMA_STATUS_CTRL_ENABLE);
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_disable);
-
-uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma)
-{
- uint32_t residue;
- residue = jz4740_dma_read(JZ_REG_DMA_TRANSFER_COUNT(dma->id));
- return residue << dma->transfer_shift;
-}
-EXPORT_SYMBOL_GPL(jz4740_dma_get_residue);
-
-static void jz4740_dma_chan_irq(struct jz4740_dma_chan *dma)
-{
- (void) jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id));
-
- jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
- JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
-
- if (dma->complete_cb)
- dma->complete_cb(dma, 0, dma->dev);
-}
-
-static irqreturn_t jz4740_dma_irq(int irq, void *dev_id)
-{
- uint32_t irq_status;
- unsigned int i;
-
- irq_status = readl(jz4740_dma_base + JZ_REG_DMA_IRQ);
-
- for (i = 0; i < 6; ++i) {
- if (irq_status & (1 << i))
- jz4740_dma_chan_irq(&jz4740_dma_channels[i]);
- }
-
- return IRQ_HANDLED;
-}
-
-static int jz4740_dma_init(void)
-{
- struct clk *clk;
- unsigned int ret;
-
- jz4740_dma_base = ioremap(JZ4740_DMAC_BASE_ADDR, 0x400);
-
- if (!jz4740_dma_base)
- return -EBUSY;
-
- spin_lock_init(&jz4740_dma_lock);
-
- clk = clk_get(NULL, "dma");
- if (IS_ERR(clk)) {
- ret = PTR_ERR(clk);
- printk(KERN_ERR "JZ4740 DMA: Failed to request clock: %d\n",
- ret);
- goto err_iounmap;
- }
-
- ret = request_irq(JZ4740_IRQ_DMAC, jz4740_dma_irq, 0, "DMA", NULL);
- if (ret) {
- printk(KERN_ERR "JZ4740 DMA: Failed to request irq: %d\n", ret);
- goto err_clkput;
- }
-
- clk_prepare_enable(clk);
-
- return 0;
-
-err_clkput:
- clk_put(clk);
-
-err_iounmap:
- iounmap(jz4740_dma_base);
- return ret;
-}
-arch_initcall(jz4740_dma_init);
#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>
#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_dmaengine_chan {
struct virt_dma_chan vchan;
- struct jz4740_dma_chan *jz_chan;
+ 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);
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) +
const struct dma_slave_config *config)
{
struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
- struct jz4740_dma_config jzcfg;
+ 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:
- jzcfg.flags = JZ4740_DMA_SRC_AUTOINC;
- jzcfg.transfer_size = jz4740_dma_maxburst(config->dst_maxburst);
+ 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:
- jzcfg.flags = JZ4740_DMA_DST_AUTOINC;
- jzcfg.transfer_size = jz4740_dma_maxburst(config->src_maxburst);
+ 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;
+ }
- jzcfg.src_width = jz4740_dma_width(config->src_addr_width);
- jzcfg.dst_width = jz4740_dma_width(config->dst_addr_width);
- jzcfg.mode = JZ4740_DMA_MODE_SINGLE;
- jzcfg.request_type = config->slave_id;
+ 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_configure(chan->jz_chan, &jzcfg);
+ 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_disable(chan->jz_chan);
+ 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);
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_disable(chan->jz_chan);
+ 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);
src_addr = chan->fifo_addr;
dst_addr = sg->addr;
}
- jz4740_dma_set_src_addr(chan->jz_chan, src_addr);
- jz4740_dma_set_dst_addr(chan->jz_chan, dst_addr);
- jz4740_dma_set_transfer_count(chan->jz_chan, sg->len);
+ 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_enable(chan->jz_chan);
+ 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_complete_cb(struct jz4740_dma_chan *jz_chan, int error,
- void *devid)
+static void jz4740_dma_chan_irq(struct jz4740_dmaengine_chan *chan)
{
- struct jz4740_dmaengine_chan *chan = devid;
-
spin_lock(&chan->vchan.lock);
if (chan->desc) {
if (chan->desc && chan->desc->cyclic) {
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);
static size_t jz4740_dma_desc_residue(struct jz4740_dmaengine_chan *chan,
struct jz4740_dma_desc *desc, unsigned int next_sg)
{
- size_t residue = 0;
+ 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)
- residue += jz4740_dma_get_residue(chan->jz_chan);
+ if (next_sg != 0) {
+ count = jz4740_dma_read(dmadev,
+ JZ_REG_DMA_TRANSFER_COUNT(chan->id));
+ residue += count << chan->transfer_shift;
+ }
return residue;
}
static int jz4740_dma_alloc_chan_resources(struct dma_chan *c)
{
- struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-
- chan->jz_chan = jz4740_dma_request(chan, NULL);
- if (!chan->jz_chan)
- return -EBUSY;
-
- jz4740_dma_set_complete_cb(chan->jz_chan, jz4740_dma_complete_cb);
-
return 0;
}
static void jz4740_dma_free_chan_resources(struct dma_chan *c)
{
- struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-
- vchan_free_chan_resources(&chan->vchan);
- jz4740_dma_free(chan->jz_chan);
- chan->jz_chan = NULL;
+ vchan_free_chan_resources(to_virt_chan(c));
}
static void jz4740_dma_desc_free(struct virt_dma_desc *vdesc)
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)
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_alloc_chan_resources = jz4740_dma_alloc_chan_resources;
for (i = 0; i < dd->chancnt; i++) {
chan = &dmadev->chan[i];
+ chan->id = i;
chan->vchan.desc_free = jz4740_dma_desc_free;
vchan_init(&chan->vchan, 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;
}
projects / users / willy / pagecache.git / commitdiff