On 03/19/2015 08:55 PM, Tony Lindgren wrote:
--- a/drivers/usb/musb/musb_dsps.c +++ b/drivers/usb/musb/musb_dsps.c @@ -655,6 +655,36 @@ static int dsps_musb_reset(struct musb *musb) return !session_restart; } +/* Similar to am35x, dm81xx support only 32-bit read operation */ +static void dsps_read_fifo32(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. + */
This comment seems misplaced, it belongs before the next *if*.
+ if (len > 4) { + for (i = 0; i < (len >> 2); i++) { + *(u32 *)dst = musb_readl(fifo, 0); + dst += 4; + }
Not sure how this is different to using readsl().
Ah, the default implementation of musb_readl() uses __raw_readl(). So you'd probably want to keep this loop, not readsl() call.
Not sure I follow you here..
I just wrongly thought readsl() uses readl() internally. readl() is supposed to swap bytes when needed (BE case), while __raw_readl() is not.
Also include/asm-generic/io.h readsl() uses __raw_readl()?
Looking at the arch/arm/include/asm/io.h, readsl() is equivalent to __raw_readsl() too. Forgot about this "asymmetry".
It seems things work with what I posted, so a readsl() loop, then just read the remaining 1 to 3 bytes.
In LE mode, there would have been no difference anyway.
Regards,
Tony
WBR, Sergei -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
