summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--drivers/usb/core/hcd.c2
-rw-r--r--drivers/usb/musb/musb_core.c3
-rw-r--r--drivers/usb/musb/musb_gadget.c124
-rw-r--r--include/linux/usb.h4
4 files changed, 95 insertions, 38 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 61800f77dac..ced846ac414 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1330,6 +1330,8 @@ static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
*/
if (usb_endpoint_xfer_control(&urb->ep->desc)) {
+ if (hcd->self.uses_pio_for_control)
+ return ret;
if (hcd->self.uses_dma) {
urb->setup_dma = dma_map_single(
hcd->self.controller,
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index e6669fc3b80..99beebce855 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2116,12 +2116,15 @@ bad_config:
* Otherwise, wait till the gadget driver hooks up.
*/
if (!is_otg_enabled(musb) && is_host_enabled(musb)) {
+ struct usb_hcd *hcd = musb_to_hcd(musb);
+
MUSB_HST_MODE(musb);
musb->xceiv->default_a = 1;
musb->xceiv->state = OTG_STATE_A_IDLE;
status = usb_add_hcd(musb_to_hcd(musb), -1, 0);
+ hcd->self.uses_pio_for_control = 1;
DBG(1, "%s mode, status %d, devctl %02x %c\n",
"HOST", status,
musb_readb(musb->mregs, MUSB_DEVCTL),
diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 36cfd060dbe..9d6ade82b9f 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;
}
}
}
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 24300d8a1bc..a28eb259257 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -313,6 +313,10 @@ struct usb_bus {
int busnum; /* Bus number (in order of reg) */
const char *bus_name; /* stable id (PCI slot_name etc) */
u8 uses_dma; /* Does the host controller use DMA? */
+ u8 uses_pio_for_control; /*
+ * Does the host controller use PIO
+ * for control transfers?
+ */
u8 otg_port; /* 0, or number of OTG/HNP port */
unsigned is_b_host:1; /* true during some HNP roleswitches */
unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 17:47:19 +0000