The da8xx has a cppi41 dma controller.
This is add the glue layer required to make it work on da8xx,
as well some changes in driver (e.g to manage clock).
Signed-off-by: Alexandre Bailon <abailon@xxxxxxxxxxxx>
---
drivers/dma/cppi41.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 95 insertions(+)
diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c
index 939398e..4318e53 100644
--- a/drivers/dma/cppi41.c
+++ b/drivers/dma/cppi41.c
@@ -1,3 +1,4 @@
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/dma-mapping.h>
@@ -86,10 +87,19 @@
#define USBSS_IRQ_PD_COMP (1 << 2)
+/* USB DA8XX */
+#define DA8XX_INTR_SRC_MASKED 0x38
+#define DA8XX_END_OF_INTR 0x3c
+
+#define DA8XX_QMGR_PENDING_MASK (0xf << 24)
+
+
+
/* Packet Descriptor */
#define PD2_ZERO_LENGTH (1 << 19)
#define AM335X_CPPI41 0
+#define DA8XX_CPPI41 1
struct cppi41_channel {
struct dma_chan chan;
@@ -158,6 +168,9 @@ struct cppi41_dd {
/* context for suspend/resume */
unsigned int dma_tdfdq;
+
+ /* da8xx clock */
+ struct clk *clk;
};
static struct chan_queues am335x_usb_queues_tx[] = {
@@ -232,6 +245,20 @@ static const struct chan_queues am335x_usb_queues_rx[] = {
[29] = { .submit = 30, .complete = 155},
};
+static const struct chan_queues da8xx_usb_queues_tx[] = {
+ [0] = { .submit = 16, .complete = 24},
+ [1] = { .submit = 18, .complete = 24},
+ [2] = { .submit = 20, .complete = 24},
+ [3] = { .submit = 22, .complete = 24},
+};
+
+static const struct chan_queues da8xx_usb_queues_rx[] = {
+ [0] = { .submit = 1, .complete = 26},
+ [1] = { .submit = 3, .complete = 26},
+ [2] = { .submit = 5, .complete = 26},
+ [3] = { .submit = 7, .complete = 26},
+};
+
struct cppi_glue_infos {
irqreturn_t (*isr)(int irq, void *data);
const struct chan_queues *queues_rx;
@@ -366,6 +393,26 @@ static irqreturn_t am335x_cppi41_irq(int irq, void *data)
return cppi41_irq(cdd);
}
+static irqreturn_t da8xx_cppi41_irq(int irq, void *data)
+{
+ struct cppi41_dd *cdd = data;
+ u32 status;
+ u32 usbss_status;
+
+ status = cppi_readl(cdd->qmgr_mem + QMGR_PEND(0));
+ if (status & DA8XX_QMGR_PENDING_MASK)
+ cppi41_irq(cdd);
+ else
+ return IRQ_NONE;
+
+ /* Re-assert IRQ if there no usb core interrupts pending */
+ usbss_status = cppi_readl(cdd->usbss_mem + DA8XX_INTR_SRC_MASKED);
+ if (!usbss_status)
+ cppi_writel(0, cdd->usbss_mem + DA8XX_END_OF_INTR);
+
+ return IRQ_HANDLED;
+}
+
static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx)
{
dma_cookie_t cookie;
@@ -972,8 +1019,19 @@ static const struct cppi_glue_infos am335x_usb_infos = {
.platform = AM335X_CPPI41,
};
+static const struct cppi_glue_infos da8xx_usb_infos = {
+ .isr = da8xx_cppi41_irq,
+ .queues_rx = da8xx_usb_queues_rx,
+ .queues_tx = da8xx_usb_queues_tx,
+ .td_queue = { .submit = 31, .complete = 0 },
+ .first_completion_queue = 24,
+ .qmgr_num_pend = 2,
+ .platform = DA8XX_CPPI41,
+};
+
static const struct of_device_id cppi41_dma_ids[] = {
{ .compatible = "ti,am3359-cppi41", .data = &am335x_usb_infos},
+ { .compatible = "ti,da8xx-cppi41", .data = &da8xx_usb_infos},
{},
};
MODULE_DEVICE_TABLE(of, cppi41_dma_ids);
@@ -995,6 +1053,13 @@ static int is_am335x_cppi41(struct device *dev)
return cdd->platform == AM335X_CPPI41;
}
+static int is_da8xx_cppi41(struct device *dev)
+{
+ struct cppi41_dd *cdd = dev_get_drvdata(dev);
+
+ return cdd->platform == DA8XX_CPPI41;
+}
+
#define CPPI41_DMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
@@ -1058,6 +1123,21 @@ static int cppi41_dma_probe(struct platform_device *pdev)
cdd->first_completion_queue = glue_info->first_completion_queue;
cdd->platform = glue_info->platform;
+ if (is_da8xx_cppi41(dev)) {
+ cdd->clk = devm_clk_get(&pdev->dev, "usb20");
+ ret = PTR_ERR_OR_ZERO(cdd->clk);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to get clock\n");
+ goto err_clk_en;
+ }
+
+ ret = clk_prepare_enable(cdd->clk);
+ if (ret) {
+ dev_err(dev, "failed to enable clock\n");
+ goto err_clk_en;
+ }
+ }
+
ret = of_property_read_u32(dev->of_node,
"#dma-channels", &cdd->n_chans);
if (ret)
@@ -1112,6 +1192,9 @@ static int cppi41_dma_probe(struct platform_device *pdev)
err_init_cppi:
pm_runtime_dont_use_autosuspend(dev);
err_get_n_chans:
+ if (is_da8xx_cppi41(dev))
+ clk_disable_unprepare(cdd->clk);
+err_clk_en:
err_get_sync:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
@@ -1146,6 +1229,8 @@ static int cppi41_dma_remove(struct platform_device *pdev)
pm_runtime_dont_use_autosuspend(&pdev->dev);
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
+ if (is_da8xx_cppi41(&pdev->dev))
+ clk_disable_unprepare(cdd->clk);
return 0;
}
@@ -1158,6 +1243,9 @@ static int __maybe_unused cppi41_suspend(struct device *dev)
cppi_writel(0, cdd->usbss_mem + USBSS_IRQ_CLEARR);
disable_sched(cdd);
+ if (is_da8xx_cppi41(dev))
+ clk_disable_unprepare(cdd->clk);
+
return 0;
}
@@ -1165,8 +1253,15 @@ static int __maybe_unused cppi41_resume(struct device *dev)
{
struct cppi41_dd *cdd = dev_get_drvdata(dev);
struct cppi41_channel *c;
+ int ret;
int i;
+ if (is_da8xx_cppi41(dev)) {
+ ret = clk_prepare_enable(cdd->clk);
+ if (ret)
+ return ret;
+ }
+
for (i = 0; i < DESCS_AREAS; i++)
cppi_writel(cdd->descs_phys, cdd->qmgr_mem + QMGR_MEMBASE(i));
--
2.10.2
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