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-rw-r--r--drivers/usb/core/hcd.c22
-rw-r--r--include/linux/usb.h1
-rw-r--r--include/linux/usb/hcd.h15
3 files changed, 36 insertions, 2 deletions
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 335c1ddb260d..d0b782c4523a 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1281,6 +1281,14 @@ void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
}
EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_setup_for_dma);
+static void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
+{
+ if (hcd->driver->unmap_urb_for_dma)
+ hcd->driver->unmap_urb_for_dma(hcd, urb);
+ else
+ usb_hcd_unmap_urb_for_dma(hcd, urb);
+}
+
void usb_hcd_unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
enum dma_data_direction dir;
@@ -1319,6 +1327,15 @@ EXPORT_SYMBOL_GPL(usb_hcd_unmap_urb_for_dma);
static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
gfp_t mem_flags)
{
+ if (hcd->driver->map_urb_for_dma)
+ return hcd->driver->map_urb_for_dma(hcd, urb, mem_flags);
+ else
+ return usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
+}
+
+int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags)
+{
enum dma_data_direction dir;
int ret = 0;
@@ -1414,6 +1431,7 @@ static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
}
return ret;
}
+EXPORT_SYMBOL_GPL(usb_hcd_map_urb_for_dma);
/*-------------------------------------------------------------------------*/
@@ -1451,7 +1469,7 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
if (likely(status == 0)) {
status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
if (unlikely(status))
- usb_hcd_unmap_urb_for_dma(hcd, urb);
+ unmap_urb_for_dma(hcd, urb);
}
}
@@ -1557,7 +1575,7 @@ void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
!status))
status = -EREMOTEIO;
- usb_hcd_unmap_urb_for_dma(hcd, urb);
+ unmap_urb_for_dma(hcd, urb);
usbmon_urb_complete(&hcd->self, urb, status);
usb_unanchor_urb(urb);
diff --git a/include/linux/usb.h b/include/linux/usb.h
index bd69b65f3356..e63efeb378e3 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -976,6 +976,7 @@ extern int usb_disabled(void);
#define URB_SETUP_MAP_SINGLE 0x00100000 /* Setup packet DMA mapped */
#define URB_SETUP_MAP_LOCAL 0x00200000 /* HCD-local setup packet */
#define URB_DMA_SG_COMBINED 0x00400000 /* S-G entries were combined */
+#define URB_ALIGNED_TEMP_BUFFER 0x00800000 /* Temp buffer was alloc'd */
struct usb_iso_packet_descriptor {
unsigned int offset;
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 395704bdf5cc..92b96fe39307 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -233,6 +233,19 @@ struct hc_driver {
int (*urb_dequeue)(struct usb_hcd *hcd,
struct urb *urb, int status);
+ /*
+ * (optional) these hooks allow an HCD to override the default DMA
+ * mapping and unmapping routines. In general, they shouldn't be
+ * necessary unless the host controller has special DMA requirements,
+ * such as alignment contraints. If these are not specified, the
+ * general usb_hcd_(un)?map_urb_for_dma functions will be used instead
+ * (and it may be a good idea to call these functions in your HCD
+ * implementation)
+ */
+ int (*map_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags);
+ void (*unmap_urb_for_dma)(struct usb_hcd *hcd, struct urb *urb);
+
/* hw synch, freeing endpoint resources that urb_dequeue can't */
void (*endpoint_disable)(struct usb_hcd *hcd,
struct usb_host_endpoint *ep);
@@ -329,6 +342,8 @@ extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
extern int usb_hcd_unlink_urb(struct urb *urb, int status);
extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
int status);
+extern int usb_hcd_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
+ gfp_t mem_flags);
extern void usb_hcd_unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
extern void usb_hcd_unmap_urb_for_dma(struct usb_hcd *, struct urb *);
extern void usb_hcd_flush_endpoint(struct usb_device *udev,