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@xxxxxx>
---
No change from v3.
drivers/usb/musb/am35x.c | 30 ++++++++++++++++++++++++++++++
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 ee0c104..dce99fc 100644
--- a/drivers/usb/musb/am35x.c
+++ b/drivers/usb/musb/am35x.c
@@ -508,3 +508,33 @@ 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 rest 1 to 3 bytes 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 %= 4;
+ }
+ 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 472b2a7..f03a2aa 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 */
--
1.6.2.4
--
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