On 01/09/2017 07:06 PM, Alexandre Bailon wrote:
The da8xx has a cppi41 dma controller.
It's called CPPI 4.1. :-)
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 <abai...@baylibre.com>
---
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
[...]
@@ -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)
+
+
+
One empty line is enough.
/* Packet Descriptor */
#define PD2_ZERO_LENGTH (1 << 19)
#define AM335X_CPPI41 0
+#define DA8XX_CPPI41 1
struct cppi41_channel {
struct dma_chan chan;
[...]
@@ -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;
Seems correct...
+
+ /* 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);
I don't understand this...
+
+ return IRQ_HANDLED;
+}
+
static dma_cookie_t cppi41_tx_submit(struct dma_async_tx_descriptor *tx)
{
dma_cookie_t cookie;
[...]
MBR, Sergei
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