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authorDavid Brownell <david-b@pacbell.net>2008-04-06 23:32:55 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-24 21:16:49 -0700
commit3cf2723432dd27402a4a4941ad2d04eae5dd639c (patch)
treec63fb9258fcb0f2665ba818881cd84dc9b299daa /drivers/usb
parenta89a2cd396b20c46a37fa8db4b652fb00f29d0a4 (diff)
USB: at91_udc can prefetch data
The at91sam9 chip are ARMv5 so they support preload instructions. Use preloading to load the FIFO a bit faster. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/at91_udc.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/gadget/at91_udc.c b/drivers/usb/gadget/at91_udc.c
index fd15ced899d..5d352c900d2 100644
--- a/drivers/usb/gadget/at91_udc.c
+++ b/drivers/usb/gadget/at91_udc.c
@@ -389,6 +389,7 @@ static int write_fifo(struct at91_ep *ep, struct at91_request *req)
u32 csr = __raw_readl(creg);
u8 __iomem *dreg = ep->creg + (AT91_UDP_FDR(0) - AT91_UDP_CSR(0));
unsigned total, count, is_last;
+ u8 *buf;
/*
* TODO: allow for writing two packets to the fifo ... that'll
@@ -413,6 +414,8 @@ static int write_fifo(struct at91_ep *ep, struct at91_request *req)
return 0;
}
+ buf = req->req.buf + req->req.actual;
+ prefetch(buf);
total = req->req.length - req->req.actual;
if (ep->ep.maxpacket < total) {
count = ep->ep.maxpacket;
@@ -435,7 +438,7 @@ static int write_fifo(struct at91_ep *ep, struct at91_request *req)
* recover when the actual bytecount matters (e.g. for USB Test
* and Measurement Class devices).
*/
- __raw_writesb(dreg, req->req.buf + req->req.actual, count);
+ __raw_writesb(dreg, buf, count);
csr &= ~SET_FX;
csr |= CLR_FX | AT91_UDP_TXPKTRDY;
__raw_writel(csr, creg);