diff options
| author | Ajay Kumar Gupta <ajay.gupta@ti.com> | 2010-10-19 10:08:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:22:17 -0700 |
| commit | 843bb1d0ff29b96eeb184988223ba55e3e8c2f57 (patch) | |
| tree | cfddfb6141e53f86a107803ebddfcc18996737de /drivers/usb/musb | |
| parent | eb83092c2b24587719c917a1d6a5b682eeaa03df (diff) | |
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 <ajay.gupta@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/musb')
| -rw-r--r-- | drivers/usb/musb/am35x.c | 30 | ||||
| -rw-r--r-- | drivers/usb/musb/musb_core.c | 2 |
2 files changed, 32 insertions, 0 deletions
diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c index 53962a0389e..b0aabf3a606 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); + } +} diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 7e2c353755d..c9f9024c551 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -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 */ |