diff options
Diffstat (limited to 'drivers/usb/musb/musb_gadget.c')
| -rw-r--r-- | drivers/usb/musb/musb_gadget.c | 124 |
1 files changed, 86 insertions, 38 deletions
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index 36cfd060dbe5..9d6ade82b9f2 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -92,6 +92,59 @@ /* ----------------------------------------------------------------------- */ +/* Maps the buffer to dma */ + +static inline void map_dma_buffer(struct musb_request *request, + struct musb *musb) +{ + if (request->request.dma == DMA_ADDR_INVALID) { + request->request.dma = dma_map_single( + musb->controller, + request->request.buf, + request->request.length, + request->tx + ? DMA_TO_DEVICE + : DMA_FROM_DEVICE); + request->mapped = 1; + } else { + dma_sync_single_for_device(musb->controller, + request->request.dma, + request->request.length, + request->tx + ? DMA_TO_DEVICE + : DMA_FROM_DEVICE); + request->mapped = 0; + } +} + +/* Unmap the buffer from dma and maps it back to cpu */ +static inline void unmap_dma_buffer(struct musb_request *request, + struct musb *musb) +{ + if (request->request.dma == DMA_ADDR_INVALID) { + DBG(20, "not unmapping a never mapped buffer\n"); + return; + } + if (request->mapped) { + dma_unmap_single(musb->controller, + request->request.dma, + request->request.length, + request->tx + ? DMA_TO_DEVICE + : DMA_FROM_DEVICE); + request->request.dma = DMA_ADDR_INVALID; + request->mapped = 0; + } else { + dma_sync_single_for_cpu(musb->controller, + request->request.dma, + request->request.length, + request->tx + ? DMA_TO_DEVICE + : DMA_FROM_DEVICE); + + } +} + /* * Immediately complete a request. * @@ -119,24 +172,8 @@ __acquires(ep->musb->lock) ep->busy = 1; spin_unlock(&musb->lock); - if (is_dma_capable()) { - if (req->mapped) { - dma_unmap_single(musb->controller, - req->request.dma, - req->request.length, - req->tx - ? DMA_TO_DEVICE - : DMA_FROM_DEVICE); - req->request.dma = DMA_ADDR_INVALID; - req->mapped = 0; - } else if (req->request.dma != DMA_ADDR_INVALID) - dma_sync_single_for_cpu(musb->controller, - req->request.dma, - req->request.length, - req->tx - ? DMA_TO_DEVICE - : DMA_FROM_DEVICE); - } + if (is_dma_capable() && ep->dma) + unmap_dma_buffer(req, musb); if (request->status == 0) DBG(5, "%s done request %p, %d/%d\n", ep->end_point.name, request, @@ -395,6 +432,13 @@ static void txstate(struct musb *musb, struct musb_request *req) #endif if (!use_dma) { + /* + * Unmap the dma buffer back to cpu if dma channel + * programming fails + */ + if (is_dma_capable() && musb_ep->dma) + unmap_dma_buffer(req, musb); + musb_write_fifo(musb_ep->hw_ep, fifo_count, (u8 *) (request->buf + request->actual)); request->actual += fifo_count; @@ -713,6 +757,21 @@ static void rxstate(struct musb *musb, struct musb_request *req) return; } #endif + /* + * Unmap the dma buffer back to cpu if dma channel + * programming fails. This buffer is mapped if the + * channel allocation is successful + */ + if (is_dma_capable() && musb_ep->dma) { + unmap_dma_buffer(req, musb); + + /* + * Clear DMAENAB and AUTOCLEAR for the + * PIO mode transfer + */ + csr &= ~(MUSB_RXCSR_DMAENAB | MUSB_RXCSR_AUTOCLEAR); + musb_writew(epio, MUSB_RXCSR, csr); + } musb_read_fifo(musb_ep->hw_ep, fifo_count, (u8 *) (request->buf + request->actual)); @@ -837,7 +896,9 @@ void musb_g_rx(struct musb *musb, u8 epnum) if (!request) return; } +#if defined(CONFIG_USB_INVENTRA_DMA) || defined(CONFIG_USB_TUSB_OMAP_DMA) exit: +#endif /* Analyze request */ rxstate(musb, to_musb_request(request)); } @@ -1150,26 +1211,9 @@ static int musb_gadget_queue(struct usb_ep *ep, struct usb_request *req, request->epnum = musb_ep->current_epnum; request->tx = musb_ep->is_in; - if (is_dma_capable() && musb_ep->dma) { - if (request->request.dma == DMA_ADDR_INVALID) { - request->request.dma = dma_map_single( - musb->controller, - request->request.buf, - request->request.length, - request->tx - ? DMA_TO_DEVICE - : DMA_FROM_DEVICE); - request->mapped = 1; - } else { - dma_sync_single_for_device(musb->controller, - request->request.dma, - request->request.length, - request->tx - ? DMA_TO_DEVICE - : DMA_FROM_DEVICE); - request->mapped = 0; - } - } else + if (is_dma_capable() && musb_ep->dma) + map_dma_buffer(request, musb); + else request->mapped = 0; spin_lock_irqsave(&musb->lock, lockflags); @@ -1789,6 +1833,8 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver, spin_unlock_irqrestore(&musb->lock, flags); if (is_otg_enabled(musb)) { + struct usb_hcd *hcd = musb_to_hcd(musb); + DBG(3, "OTG startup...\n"); /* REVISIT: funcall to other code, which also @@ -1803,6 +1849,8 @@ int usb_gadget_probe_driver(struct usb_gadget_driver *driver, musb->gadget_driver = NULL; musb->g.dev.driver = NULL; spin_unlock_irqrestore(&musb->lock, flags); + } else { + hcd->self.uses_pio_for_control = 1; } } } |