From bd5e301d35621f2b00e0ecd77464c6c0e967fdbb Mon Sep 17 00:00:00 2001 From: Kuo-Jung Su Date: Fri, 20 Dec 2013 12:32:59 +0800 Subject: [PATCH] usb: gadget: fotg210: add w1c interrupt status support 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 CC: Marek Vasut --- drivers/usb/gadget/fotg210.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/usb/gadget/fotg210.c b/drivers/usb/gadget/fotg210.c index 6e19db15fa..cc5c507f87 100644 --- a/drivers/usb/gadget/fotg210.c +++ b/drivers/usb/gadget/fotg210.c @@ -847,6 +847,13 @@ int usb_gadget_handle_interrupts(void) /* CX interrupts */ if (gisr & GISR_GRP0) { st = readl(®s->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, ®s->gisr0); writel(0, ®s->gisr0); if (st & GISR0_CXERR) @@ -873,6 +880,13 @@ int usb_gadget_handle_interrupts(void) /* Device Status Interrupts */ if (gisr & GISR_GRP2) { st = readl(®s->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, ®s->gisr2); writel(0, ®s->gisr2); if (st & GISR2_RESET) -- 2.39.5