From 843bb1d0ff29b96eeb184988223ba55e3e8c2f57 Mon Sep 17 00:00:00 2001 From: Ajay Kumar Gupta Date: Tue, 19 Oct 2010 10:08:13 +0300 Subject: USB: 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 Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- drivers/usb/musb/am35x.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers/usb/musb/am35x.c') diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c index 53962a0..b0aabf3 100644 --- a/drivers/usb/musb/am35x.c +++ b/drivers/usb/musb/am35x.c @@ -492,3 +492,33 @@ void musb_platform_restore_context(struct musb *musb, phy_on(); } #endif + +/* AM35x supports only 32bit read operation */ +void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) +{ + void __iomem *fifo = hw_ep->fifo; + u32 val; + int i; + + /* Read for 32bit-aligned destination address */ + if (likely((0x03 & (unsigned long) dst) == 0) && len >= 4) { + readsl(fifo, dst, len >> 2); + dst += len & ~0x03; + len &= 0x03; + } + /* + * Now read the remaining 1 to 3 byte or complete length if + * unaligned address. + */ + if (len > 4) { + for (i = 0; i < (len >> 2); i++) { + *(u32 *) dst = musb_readl(fifo, 0); + dst += 4; + } + len &= 0x03; + } + if (len > 0) { + val = musb_readl(fifo, 0); + memcpy(dst, &val, len); + } +} -- cgit v1.1