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usb: gadget: fotg210: add w1c interrupt status support

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Since hardware revision 1.11.0, the following interrupt status
registers are now W1C (i.e., write 1 clear):

1. Interrupt Source Group 0 Register (0x144) (EP0 Abort: BIT5)
2. Interrupt Source Group 2 Register (0x14C) (All bits)

And before revision 1.11.0, these registers are all R/W.
Which means software must write a 0 to clear the status.

Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
CC: Marek Vasut <marex@denx.de>
This commit is contained in:
Kuo-Jung Su 2013-12-20 12:32:59 +08:00 committed by Marek Vasut
parent 7f673c99c2
commit bd5e301d35
1 changed files with 14 additions and 0 deletions
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14
drivers/usb/gadget/fotg210.c
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@ -847,6 +847,13 @@ int usb_gadget_handle_interrupts(void)
/* CX interrupts */
if (gisr & GISR_GRP0) {
st = readl(&regs->gisr0);
/*
* Write 1 and then 0 works for both W1C & RW.
*
* HW v1.11.0+: It's a W1C register (write 1 clear)
* HW v1.10.0-: It's a R/W register (write 0 clear)
*/
writel(st & GISR0_CXABORT, &regs->gisr0);
writel(0, &regs->gisr0);
if (st & GISR0_CXERR)
@ -873,6 +880,13 @@ int usb_gadget_handle_interrupts(void)
/* Device Status Interrupts */
if (gisr & GISR_GRP2) {
st = readl(&regs->gisr2);
/*
* Write 1 and then 0 works for both W1C & RW.
*
* HW v1.11.0+: It's a W1C register (write 1 clear)
* HW v1.10.0-: It's a R/W register (write 0 clear)
*/
writel(st, &regs->gisr2);
writel(0, &regs->gisr2);
if (st & GISR2_RESET)