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usb: musb: dma: Add a DMA completion platform callback 

Currently, the CPPI 4.1 driver is not completely generic and
only works on DSPS. This is because of IRQ management.
Add a callback to dma_controller that could be invoked on DMA completion
to acknowledge the IRQ.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre Bailon 2017-02-06 22:53:51 -06:00 committed by Greg Kroah-Hartman
parent 7c92e5fbf4
commit 050dc900cf
2 changed files with 10 additions and 2 deletions
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7
drivers/usb/musb/musb_cppi41.c
View File

@ -217,6 +217,10 @@ static void cppi41_dma_callback(void *private_data)
int is_hs = 0;
bool empty;
controller = cppi41_channel->controller;
if (controller->controller.dma_callback)
controller->controller.dma_callback(&controller->controller);
spin_lock_irqsave(&musb->lock, flags);
dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
@ -249,8 +253,6 @@ 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;
@ -695,6 +697,7 @@ cppi41_dma_controller_create(struct musb *musb, void __iomem *base)
controller->controller.channel_program = cppi41_dma_channel_program;
controller->controller.channel_abort = cppi41_dma_channel_abort;
controller->controller.is_compatible = cppi41_is_compatible;
controller->controller.musb = musb;
ret = cppi41_dma_controller_start(controller);
if (ret)

5
drivers/usb/musb/musb_dma.h
View File

@ -173,6 +173,7 @@ dma_channel_status(struct dma_channel *c)
/**
* struct dma_controller - A DMA Controller.
* @musb: the usb controller
* @start: call this to start a DMA controller;
* return 0 on success, else negative errno
* @stop: call this to stop a DMA controller
@ -181,10 +182,13 @@ dma_channel_status(struct dma_channel *c)
* @channel_release: call this to release a DMA channel
* @channel_abort: call this to abort a pending DMA transaction,
* returning it to FREE (but allocated) state
* @dma_callback: invoked on DMA completion, useful to run platform
* code such IRQ acknowledgment.
*
* Controllers manage dma channels.
*/
struct dma_controller {
struct musb *musb;
struct dma_channel *(*channel_alloc)(struct dma_controller *,
struct musb_hw_ep *, u8 is_tx);
void (*channel_release)(struct dma_channel *);
@ -196,6 +200,7 @@ struct dma_controller {
int (*is_compatible)(struct dma_channel *channel,
u16 maxpacket,
void *buf, u32 length);
void (*dma_callback)(struct dma_controller *);
};
/* called after channel_program(), may indicate a fault */