irqchip: gic: Use mask field in GICC_IAR

Bit[9:0] is interrupt ID field in GICC_IAR. Bit[12:10] is CPU ID field,
and others are reserved.

So we should use GICC_IAR_INT_ID_MASK to get interrupt ID. It's not a good way
to use ~0x1c00 (CPU ID field) to get interrupt ID.

Signed-off-by: Haojian Zhuang <haojian.zhuang@linaro.org>
Link: https://lkml.kernel.org/r/1399795571-17231-3-git-send-email-haojian.zhuang@linaro.org
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

2 files changed, 3 insertions, 1 deletions

diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
index 4300b6606f5e..f711fb6af7a9 100644
--- a/drivers/irqchip/irq-gic.c
+++ b/drivers/irqchip/irq-gic.c
@@ -287,7 +287,7 @@ static void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
 
         do {
                 irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
-                irqnr = irqstat & ~0x1c00;
+                irqnr = irqstat & GICC_IAR_INT_ID_MASK;
 
                 if (likely(irqnr > 15 && irqnr < 1021)) {
                         irqnr = irq_find_mapping(gic->domain, irqnr);
diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h
index 7ed92d0560d5..45e2d8c15bd2 100644
--- a/include/linux/irqchip/arm-gic.h
+++ b/include/linux/irqchip/arm-gic.h
@@ -21,6 +21,8 @@
 #define GIC_CPU_ACTIVEPRIO              0xd0
 #define GIC_CPU_IDENT                   0xfc
 
+#define GICC_IAR_INT_ID_MASK            0x3ff
+
 #define GIC_DIST_CTRL                   0x000
 #define GIC_DIST_CTR                    0x004
 #define GIC_DIST_IGROUP                 0x080