diff mbox

[1/3] usb: musb: cppi41: Add new methods for platform driver

Message ID 20170113145834.23967-2-abailon@baylibre.com (mailing list archive)
State New, archived
Headers show

Commit Message

Alexandre Bailon Jan. 13, 2017, 2:58 p.m. UTC 
Currently, the CPPI 4.1 driver is not completely generic and
only work on dsps.
Add two methods which will help to move platform code from CPPI 4.1 to
MUSB glue driver:
- cppi41_register_dma_callback() to register a platform dma_callback
  (e.g to acknowledge interrupt on DMA completion).
- cppi41_dma_controller_to_musb() to convert a dma_controller pointer to
  a musb pointer. This required to get a musb pointer from DMA callbacks.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
---
 drivers/usb/musb/musb_cppi41.c | 27 +++++++++++++++++++++++++--
 drivers/usb/musb/musb_dma.h    |  4 ++++
 2 files changed, 29 insertions(+), 2 deletions(-)

Comments

Sergei Shtylyov Jan. 17, 2017, 11:08 a.m. UTC | #1 
On 1/13/2017 5:58 PM, Alexandre Bailon wrote:

> Currently, the CPPI 4.1 driver is not completely generic and
> only work on dsps.
> Add two methods which will help to move platform code from CPPI 4.1 to

    Methods usually mean (in the kernel) the function pointers in a structure 
(i.e. more like the virtual methods in C++).

> MUSB glue driver:
> - cppi41_register_dma_callback() to register a platform dma_callback
>   (e.g to acknowledge interrupt on DMA completion).
> - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to
>   a musb pointer. This required to get a musb pointer from DMA callbacks.
>
> Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
[...]

MBR, Sergei

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Alexandre Bailon Jan. 17, 2017, 11:12 a.m. UTC | #2 
On 01/17/2017 12:08 PM, Sergei Shtylyov wrote:
> On 1/13/2017 5:58 PM, Alexandre Bailon wrote:
> 
>> Currently, the CPPI 4.1 driver is not completely generic and
>> only work on dsps.
>> Add two methods which will help to move platform code from CPPI 4.1 to
> 
>    Methods usually mean (in the kernel) the function pointers in a
> structure (i.e. more like the virtual methods in C++).
Ok. I will use function instead of method then.
> 
>> MUSB glue driver:
>> - cppi41_register_dma_callback() to register a platform dma_callback
>>   (e.g to acknowledge interrupt on DMA completion).
>> - cppi41_dma_controller_to_musb() to convert a dma_controller pointer to
>>   a musb pointer. This required to get a musb pointer from DMA callbacks.
>>
>> Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
> [...]
> 
> MBR, Sergei
> 

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diff mbox

Patch

diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index 1636385..d76022b 100644
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -36,6 +36,8 @@  struct cppi41_dma_controller {
 	u32 rx_mode;
 	u32 tx_mode;
 	u32 auto_req;
+
+	cppi41_platform_dma_callback dma_callback;
 };
 
 static void save_rx_toggle(struct cppi41_dma_channel *cppi41_channel)
@@ -217,6 +219,10 @@  static void cppi41_dma_callback(void *private_data)
 	int is_hs = 0;
 	bool empty;
 
+	controller = cppi41_channel->controller;
+	if (controller->dma_callback)
+		controller->dma_callback(musb);
+
 	spin_lock_irqsave(&musb->lock, flags);
 
 	dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
@@ -249,8 +255,6 @@  static void cppi41_dma_callback(void *private_data)
 	 * We spin on HS (no longer than than 25us and setup a timer on
 	 * FS to check for the bit and complete the transfer.
 	 */
-	controller = cppi41_channel->controller;
-
 	if (is_host_active(musb)) {
 		if (musb->port1_status & USB_PORT_STAT_HIGH_SPEED)
 			is_hs = 1;
@@ -288,6 +292,16 @@  static void cppi41_dma_callback(void *private_data)
 	spin_unlock_irqrestore(&musb->lock, flags);
 }
 
+void cppi41_register_dma_callback(struct dma_controller *c,
+				  cppi41_platform_dma_callback callback)
+{
+	struct cppi41_dma_controller *controller = container_of(c,
+			struct cppi41_dma_controller, controller);
+
+	controller->dma_callback = callback;
+}
+EXPORT_SYMBOL_GPL(cppi41_register_dma_callback);
+
 static u32 update_ep_mode(unsigned ep, unsigned mode, u32 old)
 {
 	unsigned shift;
@@ -709,3 +723,12 @@  cppi41_dma_controller_create(struct musb *musb, void __iomem *base)
 	return NULL;
 }
 EXPORT_SYMBOL_GPL(cppi41_dma_controller_create);
+
+struct musb *cppi41_dma_controller_to_musb(struct dma_controller *c)
+{
+	struct cppi41_dma_controller *controller = container_of(c,
+			struct cppi41_dma_controller, controller);
+
+	return controller->musb;
+}
+EXPORT_SYMBOL_GPL(cppi41_dma_controller_to_musb);
diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h
index 46357e1..7f3c585 100644
--- a/drivers/usb/musb/musb_dma.h
+++ b/drivers/usb/musb/musb_dma.h
@@ -231,9 +231,13 @@  extern struct dma_controller *
 cppi_dma_controller_create(struct musb *musb, void __iomem *base);
 extern void cppi_dma_controller_destroy(struct dma_controller *c);
 
+typedef void (*cppi41_platform_dma_callback)(struct musb *musb);
 extern struct dma_controller *
 cppi41_dma_controller_create(struct musb *musb, void __iomem *base);
 extern void cppi41_dma_controller_destroy(struct dma_controller *c);
+extern struct musb *cppi41_dma_controller_to_musb(struct dma_controller *c);
+extern void cppi41_register_dma_callback(struct dma_controller *c,
+					 cppi41_platform_dma_callback callback);
 
 extern struct dma_controller *
 ux500_dma_controller_create(struct musb *musb, void __iomem *base);