| Message ID | 20170119100659.11370-2-abailon@baylibre.com |
|---|---|
| State | New |
| Headers | show |
| Series | usb: musb: cppi41: Add a way to manage DMA irq | expand |
Hello! On 1/19/2017 1:06 PM, Alexandre Bailon wrote: > Currently, the CPPI 4.1 driver is not completely generic and > only work on dsps. This is because of IRQ management. Works. DSPS. > Add a callback to dma_controller that could be invoked on DMA completion > to acknodlege the IRQ. Acknowledge. > Signed-off-by: Alexandre Bailon <abailon@baylibre.com> [...] > diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h > index 46357e1..8bea0cd 100644 > --- a/drivers/usb/musb/musb_dma.h > +++ b/drivers/usb/musb/musb_dma.h > @@ -181,10 +181,13 @@ 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 > + * @platform_dma_callback: invoked on DMA completion, useful to run platform It's called just dma_callback below. > + * code such IRQ acknowledgment. > * > * Controllers manage dma channels. > */ > struct dma_controller { > + struct musb *musb; You forgot to document this above. > struct dma_channel *(*channel_alloc)(struct dma_controller *, > struct musb_hw_ep *, u8 is_tx); > void (*channel_release)(struct dma_channel *); > @@ -196,6 +199,7 @@ 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 */ MBR, Sergei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c index 1636385..f7d3d27 100644 --- a/drivers/usb/musb/musb_cppi41.c +++ b/drivers/usb/musb/musb_cppi41.c @@ -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) diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h index 46357e1..8bea0cd 100644 --- a/drivers/usb/musb/musb_dma.h +++ b/drivers/usb/musb/musb_dma.h @@ -181,10 +181,13 @@ 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 + * @platform_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 +199,7 @@ 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 */
Currently, the CPPI 4.1 driver is not completely generic and only work on dsps. This is because of IRQ management. Add a callback to dma_controller that could be invoked on DMA completion to acknodlege the IRQ. Signed-off-by: Alexandre Bailon <abailon@baylibre.com> --- drivers/usb/musb/musb_cppi41.c | 7 +++++-- drivers/usb/musb/musb_dma.h | 4 ++++ 2 files changed, 9 insertions(+), 2 deletions(-) -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html