The JZ4770 SoC has two DMA cores, each one featuring six DMA channels.
The major change is that each channel's clock can be enabled or disabled
through register writes.
Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
---
.../devicetree/bindings/dma/jz4780-dma.txt | 4 +-
drivers/dma/Kconfig | 2 +-
drivers/dma/dma-jz4780.c | 48 ++++++++++++++++---
3 files changed, 46 insertions(+), 8 deletions(-)
diff --git a/Documentation/devicetree/bindings/dma/jz4780-dma.txt b/Documentation/devicetree/bindings/dma/jz4780-dma.txt
index f9b1864f5b77..0fd0759053be 100644
--- a/Documentation/devicetree/bindings/dma/jz4780-dma.txt
+++ b/Documentation/devicetree/bindings/dma/jz4780-dma.txt
@@ -2,7 +2,9 @@
Required properties:
-- compatible: Should be "ingenic,jz4780-dma"
+- compatible: Should be one of:
+ * ingenic,jz4780-dma
+ * ingenic,jz4770-dma
- reg: Should contain the DMA channel registers location and length, followed
by the DMA controller registers location and length.
- interrupts: Should contain the interrupt specifier of the DMA controller.
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index ca1680afa20a..48d25dccedb7 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -143,7 +143,7 @@ config DMA_JZ4740
config DMA_JZ4780
tristate "JZ4780 DMA support"
- depends on MACH_JZ4780 || COMPILE_TEST
+ depends on MACH_JZ4780 || MACH_JZ4770 || COMPILE_TEST
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
help
diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index cd2cd70fd843..7b8b2dcd119e 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -29,6 +29,9 @@
#define JZ_DMA_REG_DIRQP 0x04
#define JZ_DMA_REG_DDR 0x08
#define JZ_DMA_REG_DDRS 0x0c
+#define JZ_DMA_REG_DCKE 0x10
+#define JZ_DMA_REG_DCKES 0x14
+#define JZ_DMA_REG_DCKEC 0x18
#define JZ_DMA_REG_DMACP 0x1c
#define JZ_DMA_REG_DSIRQP 0x20
#define JZ_DMA_REG_DSIRQM 0x24
@@ -130,6 +133,7 @@ struct jz4780_dma_chan {
};
enum jz_version {
+ ID_JZ4770,
ID_JZ4780,
};
@@ -194,6 +198,20 @@ static inline void jz4780_dma_ctrl_writel(struct jz4780_dma_dev *jzdma,
writel(val, jzdma->ctrl_base + reg);
}
+static inline void jz4780_dma_chan_enable(struct jz4780_dma_dev *jzdma,
+ unsigned int chn)
+{
+ if (jzdma->version == ID_JZ4770)
+ jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKES, BIT(chn));
+}
+
+static inline void jz4780_dma_chan_disable(struct jz4780_dma_dev *jzdma,
+ unsigned int chn)
+{
+ if (jzdma->version == ID_JZ4770)
+ jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DCKEC, BIT(chn));
+}
+
static struct jz4780_dma_desc *jz4780_dma_desc_alloc(
struct jz4780_dma_chan *jzchan, unsigned int count,
enum dma_transaction_type type)
@@ -228,8 +246,15 @@ static void jz4780_dma_desc_free(struct virt_dma_desc *vdesc)
kfree(desc);
}
-static uint32_t jz4780_dma_transfer_size(unsigned long val, uint32_t *shift)
+static const unsigned int jz4780_dma_ord_max[] = {
+ [ID_JZ4770] = 6,
+ [ID_JZ4780] = 7,
+};
+
+static uint32_t jz4780_dma_transfer_size(struct jz4780_dma_chan *jzchan,
+ unsigned long val, uint32_t *shift)
{
+ struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
int ord = ffs(val) - 1;
/*
@@ -241,8 +266,8 @@ static uint32_t jz4780_dma_transfer_size(unsigned long val, uint32_t *shift)
*/
if (ord == 3)
ord = 2;
- else if (ord > 7)
- ord = 7;
+ else if (ord > jz4780_dma_ord_max[jzdma->version])
+ ord = jz4780_dma_ord_max[jzdma->version];
*shift = ord;
@@ -294,7 +319,7 @@ static int jz4780_dma_setup_hwdesc(struct jz4780_dma_chan *jzchan,
* divisible by the transfer size, and we must not use more than the
* maximum burst specified by the user.
*/
- tsz = jz4780_dma_transfer_size(addr | len | (width * maxburst),
+ tsz = jz4780_dma_transfer_size(jzchan, addr | len | (width * maxburst),
&jzchan->transfer_shift);
switch (width) {
@@ -423,7 +448,7 @@ static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_memcpy(
if (!desc)
return NULL;
- tsz = jz4780_dma_transfer_size(dest | src | len,
+ tsz = jz4780_dma_transfer_size(jzchan, dest | src | len,
&jzchan->transfer_shift);
jzchan->transfer_type = JZ_DMA_DRT_AUTO;
@@ -484,6 +509,9 @@ static void jz4780_dma_begin(struct jz4780_dma_chan *jzchan)
(jzchan->curr_hwdesc + 1) % jzchan->desc->count;
}
+ /* Enable the channel's clock. */
+ jz4780_dma_chan_enable(jzdma, jzchan->id);
+
/* Use 4-word descriptors. */
jz4780_dma_chn_writel(jzdma, jzchan->id, JZ_DMA_REG_DCS, 0);
@@ -531,6 +559,8 @@ static int jz4780_dma_terminate_all(struct dma_chan *chan)
jzchan->desc = NULL;
}
+ jz4780_dma_chan_disable(jzdma, jzchan->id);
+
vchan_get_all_descriptors(&jzchan->vchan, &head);
spin_unlock_irqrestore(&jzchan->vchan.lock, flags);
@@ -542,8 +572,10 @@ static int jz4780_dma_terminate_all(struct dma_chan *chan)
static void jz4780_dma_synchronize(struct dma_chan *chan)
{
struct jz4780_dma_chan *jzchan = to_jz4780_dma_chan(chan);
+ struct jz4780_dma_dev *jzdma = jz4780_dma_chan_parent(jzchan);
vchan_synchronize(&jzchan->vchan);
+ jz4780_dma_chan_disable(jzdma, jzchan->id);
}
static int jz4780_dma_config(struct dma_chan *chan,
@@ -769,10 +801,12 @@ static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
}
static const unsigned int jz4780_dma_nb_channels[] = {
+ [ID_JZ4770] = 6,
[ID_JZ4780] = 32,
};
static const struct of_device_id jz4780_dma_dt_match[] = {
+ { .compatible = "ingenic,jz4770-dma", .data = (void *)ID_JZ4770 },
{ .compatible = "ingenic,jz4780-dma", .data = (void *)ID_JZ4780 },
{},
};
@@ -887,7 +921,9 @@ static int jz4780_dma_probe(struct platform_device *pdev)
*/
jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMAC,
JZ_DMA_DMAC_DMAE | JZ_DMA_DMAC_FMSC);
- jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMACP, 0);
+
+ if (jzdma->version == ID_JZ4780)
+ jz4780_dma_ctrl_writel(jzdma, JZ_DMA_REG_DMACP, 0);
INIT_LIST_HEAD(&dd->channels);
--
2.18.0
--
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