From 5689f4b5b43d7beaf725d7cc82f9efea86d6f375 Mon Sep 17 00:00:00 2001 From: Ajay Kumar Gupta Date: Fri, 9 Jul 2010 11:43:49 +0530 Subject: musb: am35x: Workaround for fifo read issue AM35x supports only 32bit read operations so we need to have workaround for 8bit and 16bit read operations. Signed-off-by: Ajay Kumar Gupta --- drivers/usb/musb/am35x.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'drivers/usb/musb/am35x.c') diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c index 2024940..1706c13 100644 --- a/drivers/usb/musb/am35x.c +++ b/drivers/usb/musb/am35x.c @@ -116,3 +116,35 @@ void musb_platform_deinit(void) /* Turn off the phy */ phy_off(); } + +/* + * This function reads data from endpoint fifo for AM35x + * which supports only 32bit read operation. + * + * ep - endpoint number + * length - number of bytes to read from FIFO + * fifo_data - pointer to data buffer into which data is read + */ +__attribute__((weak)) +void read_fifo(u8 ep, u32 length, void *fifo_data) +{ + u8 *data = (u8 *)fifo_data; + u32 val; + int i; + + /* select the endpoint index */ + writeb(ep, &musbr->index); + + if (length > 4) { + for (i = 0; i < (length >> 2); i++) { + val = readl(&musbr->fifox[ep]); + memcpy(data, &val, 4); + data += 4; + } + length %= 4; + } + if (length > 0) { + val = readl(&musbr->fifox[ep]); + memcpy(data, &val, length); + } +} -- cgit v1.1