MIPS: jz4740: Remove custom DMA API
Now that all users of the custom jz4740 DMA API have been converted to use
the dmaengine API instead we can remove the custom API and move all the code
talking to the hardware to the dmaengine driver.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/dma-jz4740.c b/drivers/dma/dma-jz4740.c
index 3d42434..b0c0c82 100644
--- a/drivers/dma/dma-jz4740.c
+++ b/drivers/dma/dma-jz4740.c
@@ -22,6 +22,8 @@
#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>
@@ -29,6 +31,76 @@
#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;
@@ -46,9 +118,10 @@
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;
@@ -56,10 +129,19 @@
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);
@@ -70,6 +152,29 @@
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) +
@@ -108,30 +213,60 @@
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);
- 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;
+ 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;
+ }
- jz4740_dma_configure(chan->jz_chan, &jzcfg);
+ 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;
}
@@ -139,11 +274,13 @@
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);
@@ -170,11 +307,13 @@
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);
@@ -196,22 +335,27 @@
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) {
@@ -227,6 +371,28 @@
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);
@@ -298,7 +464,8 @@
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;
@@ -306,8 +473,11 @@
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;
}
@@ -342,24 +512,12 @@
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)
@@ -373,7 +531,9 @@
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)
@@ -381,6 +541,17 @@
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;
@@ -396,6 +567,7 @@
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);
}
@@ -404,16 +576,28 @@
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;
}