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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>
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@ -217,6 +217,10 @@ static void cppi41_dma_callback(void *private_data)
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int is_hs = 0;
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bool empty;
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controller = cppi41_channel->controller;
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if (controller->controller.dma_callback)
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controller->controller.dma_callback(&controller->controller);
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spin_lock_irqsave(&musb->lock, flags);
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dmaengine_tx_status(cppi41_channel->dc, cppi41_channel->cookie,
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@ -249,8 +253,6 @@ static void cppi41_dma_callback(void *private_data)
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* We spin on HS (no longer than than 25us and setup a timer on
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* FS to check for the bit and complete the transfer.
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*/
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controller = cppi41_channel->controller;
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if (is_host_active(musb)) {
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if (musb->port1_status & USB_PORT_STAT_HIGH_SPEED)
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is_hs = 1;
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@ -695,6 +697,7 @@ cppi41_dma_controller_create(struct musb *musb, void __iomem *base)
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controller->controller.channel_program = cppi41_dma_channel_program;
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controller->controller.channel_abort = cppi41_dma_channel_abort;
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controller->controller.is_compatible = cppi41_is_compatible;
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controller->controller.musb = musb;
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ret = cppi41_dma_controller_start(controller);
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if (ret)
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@ -173,6 +173,7 @@ dma_channel_status(struct dma_channel *c)
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/**
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* struct dma_controller - A DMA Controller.
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* @musb: the usb controller
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* @start: call this to start a DMA controller;
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* return 0 on success, else negative errno
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* @stop: call this to stop a DMA controller
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@ -181,10 +182,13 @@ dma_channel_status(struct dma_channel *c)
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* @channel_release: call this to release a DMA channel
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* @channel_abort: call this to abort a pending DMA transaction,
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* returning it to FREE (but allocated) state
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* @dma_callback: invoked on DMA completion, useful to run platform
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* code such IRQ acknowledgment.
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*
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* Controllers manage dma channels.
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*/
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struct dma_controller {
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struct musb *musb;
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struct dma_channel *(*channel_alloc)(struct dma_controller *,
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struct musb_hw_ep *, u8 is_tx);
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void (*channel_release)(struct dma_channel *);
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@ -196,6 +200,7 @@ struct dma_controller {
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int (*is_compatible)(struct dma_channel *channel,
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u16 maxpacket,
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void *buf, u32 length);
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void (*dma_callback)(struct dma_controller *);
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};
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/* called after channel_program(), may indicate a fault */
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