diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/musb/musb_dma.h | 3 | ||||
| -rw-r--r-- | drivers/usb/musb/musb_gadget.c | 14 |
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_dma.h b/drivers/usb/musb/musb_dma.h index 916065b..3a97c4e 100644 --- a/drivers/usb/musb/musb_dma.h +++ b/drivers/usb/musb/musb_dma.h @@ -169,6 +169,9 @@ struct dma_controller { dma_addr_t dma_addr, u32 length); int (*channel_abort)(struct dma_channel *); + int (*is_compatible)(struct dma_channel *channel, + u16 maxpacket, + void *buf, u32 length); }; /* called after channel_program(), may indicate a fault */ diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index 6577503..2fe3046 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -100,11 +100,25 @@ static inline void map_dma_buffer(struct musb_request *request, struct musb *musb, struct musb_ep *musb_ep) { + int compatible = true; + struct dma_controller *dma = musb->dma_controller; + request->map_state = UN_MAPPED; if (!is_dma_capable() || !musb_ep->dma) return; + /* Check if DMA engine can handle this request. + * DMA code must reject the USB request explicitly. + * Default behaviour is to map the request. + */ + if (dma->is_compatible) + compatible = dma->is_compatible(musb_ep->dma, + musb_ep->packet_sz, request->request.buf, + request->request.length); + if (!compatible) + return; + if (request->request.dma == DMA_ADDR_INVALID) { request->request.dma = dma_map_single( musb->controller, |
