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| author | Maulik Mankad <x0082077@ti.com> | 2010-09-24 13:44:06 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:21:53 -0700 |
| commit | 496dda704bca1208e08773ba39b29a69536f5381 (patch) | |
| tree | 9b6e445625b8c40b526bef271e29df77b1cd8761 /drivers/usb/musb/musb_host.c | |
| parent | 6587cc0f30cd2f27cf0677e470f18792925a23a4 (diff) | |
| download | op-kernel-dev-496dda704bca1208e08773ba39b29a69536f5381.zip op-kernel-dev-496dda704bca1208e08773ba39b29a69536f5381.tar.gz | |
usb: musb: host: unmap the buffer for PIO data transfers
The USB stack maps the buffer for DMA if the controller supports DMA.
MUSB controller can perform DMA as well as PIO transfers.
The buffer needs to be unmapped before CPU can perform
PIO data transfers.
Export unmap_urb_for_dma() so that drivers can perform
the DMA unmapping in a sane way.
Signed-off-by: Maulik Mankad <x0082077@ti.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/musb/musb_host.c')
| -rw-r--r-- | drivers/usb/musb/musb_host.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index 9e65c47..62e39fc 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -41,6 +41,7 @@ #include <linux/errno.h> #include <linux/init.h> #include <linux/list.h> +#include <linux/dma-mapping.h> #include "musb_core.h" #include "musb_host.h" @@ -1332,6 +1333,8 @@ void musb_host_tx(struct musb *musb, u8 epnum) */ if (length > qh->maxpacket) length = qh->maxpacket; + /* Unmap the buffer so that CPU can use it */ + unmap_urb_for_dma(musb_to_hcd(musb), urb); musb_write_fifo(hw_ep, length, urb->transfer_buffer + offset); qh->segsize = length; @@ -1752,6 +1755,8 @@ void musb_host_rx(struct musb *musb, u8 epnum) #endif /* Mentor DMA */ if (!dma) { + /* Unmap the buffer so that CPU can use it */ + unmap_urb_for_dma(musb_to_hcd(musb), urb); done = musb_host_packet_rx(musb, urb, epnum, iso_err); DBG(6, "read %spacket\n", done ? "last " : ""); |
