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USB: musb: AM35x: Workaround for fifo read issue

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AM35x supports only 32bit read operations so we need to have
workaround for 8bit and 16bit read operations.

Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ajay Kumar Gupta 2010-10-19 10:08:13 +03:00 committed by Greg Kroah-Hartman
parent eb83092c2b
commit 843bb1d0ff
2 changed files with 32 additions and 0 deletions
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30
drivers/usb/musb/am35x.c
View File

@ -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);
}
}

2
drivers/usb/musb/musb_core.c
View File

@ -272,6 +272,7 @@ void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
}
}
#if !defined(CONFIG_USB_MUSB_AM35X)
/*
* Unload an endpoint's FIFO
*/
@ -309,6 +310,7 @@ void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
readsb(fifo, dst, len);
}
}
#endif
#endif /* normal PIO */