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path: root/drivers/usb/musb/musb_gadget.c
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Diffstat (limited to 'drivers/usb/musb/musb_gadget.c')
-rw-r--r--drivers/usb/musb/musb_gadget.c137
1 files changed, 94 insertions, 43 deletions
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 36cfd060dbe..9b162dfaa4f 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));
}
@@ -1075,13 +1136,16 @@ struct usb_request *musb_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
struct musb_request *request = NULL;
request = kzalloc(sizeof *request, gfp_flags);
- if (request) {
- INIT_LIST_HEAD(&request->request.list);
- request->request.dma = DMA_ADDR_INVALID;
- request->epnum = musb_ep->current_epnum;
- request->ep = musb_ep;
+ if (!request) {
+ DBG(4, "not enough memory\n");
+ return NULL;
}
+ INIT_LIST_HEAD(&request->request.list);
+ request->request.dma = DMA_ADDR_INVALID;
+ request->epnum = musb_ep->current_epnum;
+ request->ep = musb_ep;
+
return &request->request;
}
@@ -1150,26 +1214,9 @@ 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 +1836,8 @@ 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 +1852,8 @@ 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;
}
}
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-29 12:44:29 +0000