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musb-new: am35x backend driver

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Backend driver for MUSB OTG controllers found on TI AM35x.

It seems that on AM35X interrupt status registers can be updated
_before_ core registers. As we don't use true interrupts in U-Boot
and poll interrupt status registers instead this can result in
interrupt handler being called with non-updated core registers.
This confuses the code and result in hanged transfers.
Add a small delay in am35x_interrupt as a workaround.

Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>
This commit is contained in:
Ilya Yanok
2012-11-06 13:48:25 +00:00
committed by Marek Vasut
parent d2aa1154b9
commit 833a53c627
5 changed files with 715 additions and 1 deletions
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include/usb.h
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@@ -148,7 +148,7 @@ struct usb_device {
defined(CONFIG_USB_R8A66597_HCD) || defined(CONFIG_USB_DAVINCI) || \
defined(CONFIG_USB_OMAP3) || defined(CONFIG_USB_DA8XX) || \
defined(CONFIG_USB_BLACKFIN) || defined(CONFIG_USB_AM35X) || \
defined(CONFIG_USB_MUSB_DSPS)
defined(CONFIG_USB_MUSB_DSPS) || defined(CONFIG_USB_MUSB_AM35X)
int usb_lowlevel_init(int index, void **controller);
int usb_lowlevel_stop(int index);