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path: root/drivers/dma/sh/rcar-dmac.c
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Diffstat (limited to 'drivers/dma/sh/rcar-dmac.c')
-rw-r--r--drivers/dma/sh/rcar-dmac.c112
1 files changed, 78 insertions, 34 deletions
diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c
index a57705356e8b..d530c1bf11d9 100644
--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -189,7 +189,8 @@ struct rcar_dmac_chan {
* struct rcar_dmac - R-Car Gen2 DMA Controller
* @engine: base DMA engine object
* @dev: the hardware device
- * @iomem: remapped I/O memory base
+ * @dmac_base: remapped base register block
+ * @chan_base: remapped channel register block (optional)
* @n_channels: number of available channels
* @channels: array of DMAC channels
* @channels_mask: bitfield of which DMA channels are managed by this driver
@@ -198,7 +199,8 @@ struct rcar_dmac_chan {
struct rcar_dmac {
struct dma_device engine;
struct device *dev;
- void __iomem *iomem;
+ void __iomem *dmac_base;
+ void __iomem *chan_base;
unsigned int n_channels;
struct rcar_dmac_chan *channels;
@@ -209,6 +211,10 @@ struct rcar_dmac {
#define to_rcar_dmac(d) container_of(d, struct rcar_dmac, engine)
+#define for_each_rcar_dmac_chan(i, dmac, chan) \
+ for (i = 0, chan = &(dmac)->channels[0]; i < (dmac)->n_channels; i++, chan++) \
+ if (!((dmac)->channels_mask & BIT(i))) continue; else
+
/*
* struct rcar_dmac_of_data - This driver's OF data
* @chan_offset_base: DMAC channels base offset
@@ -230,7 +236,7 @@ struct rcar_dmac_of_data {
#define RCAR_DMAOR_PRI_ROUND_ROBIN (3 << 8)
#define RCAR_DMAOR_AE (1 << 2)
#define RCAR_DMAOR_DME (1 << 0)
-#define RCAR_DMACHCLR 0x0080
+#define RCAR_DMACHCLR 0x0080 /* Not on R-Car V3U */
#define RCAR_DMADPSEC 0x00a0
#define RCAR_DMASAR 0x0000
@@ -293,6 +299,9 @@ struct rcar_dmac_of_data {
#define RCAR_DMAFIXDAR 0x0014
#define RCAR_DMAFIXDPBASE 0x0060
+/* For R-Car V3U */
+#define RCAR_V3U_DMACHCLR 0x0100
+
/* Hardcode the MEMCPY transfer size to 4 bytes. */
#define RCAR_DMAC_MEMCPY_XFER_SIZE 4
@@ -303,17 +312,17 @@ struct rcar_dmac_of_data {
static void rcar_dmac_write(struct rcar_dmac *dmac, u32 reg, u32 data)
{
if (reg == RCAR_DMAOR)
- writew(data, dmac->iomem + reg);
+ writew(data, dmac->dmac_base + reg);
else
- writel(data, dmac->iomem + reg);
+ writel(data, dmac->dmac_base + reg);
}
static u32 rcar_dmac_read(struct rcar_dmac *dmac, u32 reg)
{
if (reg == RCAR_DMAOR)
- return readw(dmac->iomem + reg);
+ return readw(dmac->dmac_base + reg);
else
- return readl(dmac->iomem + reg);
+ return readl(dmac->dmac_base + reg);
}
static u32 rcar_dmac_chan_read(struct rcar_dmac_chan *chan, u32 reg)
@@ -332,6 +341,28 @@ static void rcar_dmac_chan_write(struct rcar_dmac_chan *chan, u32 reg, u32 data)
writel(data, chan->iomem + reg);
}
+static void rcar_dmac_chan_clear(struct rcar_dmac *dmac,
+ struct rcar_dmac_chan *chan)
+{
+ if (dmac->chan_base)
+ rcar_dmac_chan_write(chan, RCAR_V3U_DMACHCLR, 1);
+ else
+ rcar_dmac_write(dmac, RCAR_DMACHCLR, BIT(chan->index));
+}
+
+static void rcar_dmac_chan_clear_all(struct rcar_dmac *dmac)
+{
+ struct rcar_dmac_chan *chan;
+ unsigned int i;
+
+ if (dmac->chan_base) {
+ for_each_rcar_dmac_chan(i, dmac, chan)
+ rcar_dmac_chan_write(chan, RCAR_V3U_DMACHCLR, 1);
+ } else {
+ rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask);
+ }
+}
+
/* -----------------------------------------------------------------------------
* Initialization and configuration
*/
@@ -447,7 +478,7 @@ static int rcar_dmac_init(struct rcar_dmac *dmac)
u16 dmaor;
/* Clear all channels and enable the DMAC globally. */
- rcar_dmac_write(dmac, RCAR_DMACHCLR, dmac->channels_mask);
+ rcar_dmac_chan_clear_all(dmac);
rcar_dmac_write(dmac, RCAR_DMAOR,
RCAR_DMAOR_PRI_FIXED | RCAR_DMAOR_DME);
@@ -817,15 +848,11 @@ static void rcar_dmac_chan_reinit(struct rcar_dmac_chan *chan)
static void rcar_dmac_stop_all_chan(struct rcar_dmac *dmac)
{
+ struct rcar_dmac_chan *chan;
unsigned int i;
/* Stop all channels. */
- for (i = 0; i < dmac->n_channels; ++i) {
- struct rcar_dmac_chan *chan = &dmac->channels[i];
-
- if (!(dmac->channels_mask & BIT(i)))
- continue;
-
+ for_each_rcar_dmac_chan(i, dmac, chan) {
/* Stop and reinitialize the channel. */
spin_lock_irq(&chan->lock);
rcar_dmac_chan_halt(chan);
@@ -1566,7 +1593,7 @@ static irqreturn_t rcar_dmac_isr_channel(int irq, void *dev)
* because channel is already stopped in error case.
* We need to clear register and check DE bit as recovery.
*/
- rcar_dmac_write(dmac, RCAR_DMACHCLR, 1 << chan->index);
+ rcar_dmac_chan_clear(dmac, chan);
rcar_dmac_chcr_de_barrier(chan);
reinit = true;
goto spin_lock_end;
@@ -1732,9 +1759,7 @@ static const struct dev_pm_ops rcar_dmac_pm = {
*/
static int rcar_dmac_chan_probe(struct rcar_dmac *dmac,
- struct rcar_dmac_chan *rchan,
- const struct rcar_dmac_of_data *data,
- unsigned int index)
+ struct rcar_dmac_chan *rchan)
{
struct platform_device *pdev = to_platform_device(dmac->dev);
struct dma_chan *chan = &rchan->chan;
@@ -1742,9 +1767,6 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac,
char *irqname;
int ret;
- rchan->index = index;
- rchan->iomem = dmac->iomem + data->chan_offset_base +
- data->chan_offset_stride * index;
rchan->mid_rid = -EINVAL;
spin_lock_init(&rchan->lock);
@@ -1756,13 +1778,13 @@ static int rcar_dmac_chan_probe(struct rcar_dmac *dmac,
INIT_LIST_HEAD(&rchan->desc.wait);
/* Request the channel interrupt. */
- sprintf(pdev_irqname, "ch%u", index);
+ sprintf(pdev_irqname, "ch%u", rchan->index);
rchan->irq = platform_get_irq_byname(pdev, pdev_irqname);
if (rchan->irq < 0)
return -ENODEV;
irqname = devm_kasprintf(dmac->dev, GFP_KERNEL, "%s:%u",
- dev_name(dmac->dev), index);
+ dev_name(dmac->dev), rchan->index);
if (!irqname)
return -ENOMEM;
@@ -1828,9 +1850,11 @@ static int rcar_dmac_probe(struct platform_device *pdev)
DMA_SLAVE_BUSWIDTH_2_BYTES | DMA_SLAVE_BUSWIDTH_4_BYTES |
DMA_SLAVE_BUSWIDTH_8_BYTES | DMA_SLAVE_BUSWIDTH_16_BYTES |
DMA_SLAVE_BUSWIDTH_32_BYTES | DMA_SLAVE_BUSWIDTH_64_BYTES;
+ const struct rcar_dmac_of_data *data;
+ struct rcar_dmac_chan *chan;
struct dma_device *engine;
+ void __iomem *chan_base;
struct rcar_dmac *dmac;
- const struct rcar_dmac_of_data *data;
unsigned int i;
int ret;
@@ -1868,9 +1892,24 @@ static int rcar_dmac_probe(struct platform_device *pdev)
return -ENOMEM;
/* Request resources. */
- dmac->iomem = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(dmac->iomem))
- return PTR_ERR(dmac->iomem);
+ dmac->dmac_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(dmac->dmac_base))
+ return PTR_ERR(dmac->dmac_base);
+
+ if (!data->chan_offset_base) {
+ dmac->chan_base = devm_platform_ioremap_resource(pdev, 1);
+ if (IS_ERR(dmac->chan_base))
+ return PTR_ERR(dmac->chan_base);
+
+ chan_base = dmac->chan_base;
+ } else {
+ chan_base = dmac->dmac_base + data->chan_offset_base;
+ }
+
+ for_each_rcar_dmac_chan(i, dmac, chan) {
+ chan->index = i;
+ chan->iomem = chan_base + i * data->chan_offset_stride;
+ }
/* Enable runtime PM and initialize the device. */
pm_runtime_enable(&pdev->dev);
@@ -1916,11 +1955,8 @@ static int rcar_dmac_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&engine->channels);
- for (i = 0; i < dmac->n_channels; ++i) {
- if (!(dmac->channels_mask & BIT(i)))
- continue;
-
- ret = rcar_dmac_chan_probe(dmac, &dmac->channels[i], data, i);
+ for_each_rcar_dmac_chan(i, dmac, chan) {
+ ret = rcar_dmac_chan_probe(dmac, chan);
if (ret < 0)
goto error;
}
@@ -1968,14 +2004,22 @@ static void rcar_dmac_shutdown(struct platform_device *pdev)
}
static const struct rcar_dmac_of_data rcar_dmac_data = {
- .chan_offset_base = 0x8000,
- .chan_offset_stride = 0x80,
+ .chan_offset_base = 0x8000,
+ .chan_offset_stride = 0x80,
+};
+
+static const struct rcar_dmac_of_data rcar_v3u_dmac_data = {
+ .chan_offset_base = 0x0,
+ .chan_offset_stride = 0x1000,
};
static const struct of_device_id rcar_dmac_of_ids[] = {
{
.compatible = "renesas,rcar-dmac",
.data = &rcar_dmac_data,
+ }, {
+ .compatible = "renesas,dmac-r8a779a0",
+ .data = &rcar_v3u_dmac_data,
},
{ /* Sentinel */ }
};
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-02 12:09:19 +0300