ARM: pxa: introduce {icip,ichp}_handle_irq() to prepare MULTI_IRQ_HANDLER

Thanks Dmitry for providing a fix to the original code.

Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

2 files changed, 35 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/include/mach/irqs.h b/arch/arm/mach-pxa/include/mach/irqs.h
index a94c694b4af9..564337de9582 100644
--- a/arch/arm/mach-pxa/include/mach/irqs.h
+++ b/arch/arm/mach-pxa/include/mach/irqs.h
@@ -106,9 +106,12 @@
 
 #ifndef __ASSEMBLY__
 struct irq_data;
+struct pt_regs;
 
 void pxa_mask_irq(struct irq_data *);
 void pxa_unmask_irq(struct irq_data *);
+void icip_handle_irq(struct pt_regs *);
+void ichp_handle_irq(struct pt_regs *);
 #endif
 
 #endif /* __ASM_MACH_IRQS_H */
diff --git a/arch/arm/mach-pxa/irq.c b/arch/arm/mach-pxa/irq.c
index c89c0e40fe32..b09e848eb6c6 100644
--- a/arch/arm/mach-pxa/irq.c
+++ b/arch/arm/mach-pxa/irq.c
@@ -37,6 +37,8 @@
 #define IPR(i)                  (((i) < 32) ? (0x01c + ((i) << 2)) :            \
                                 ((i) < 64) ? (0x0b0 + (((i) - 32) << 2)) :      \
                                       (0x144 + (((i) - 64) << 2)))
+#define ICHP_VAL_IRQ            (1 << 31)
+#define ICHP_IRQ(i)             (((i) >> 16) & 0x7fff)
 #define IPR_VALID               (1 << 31)
 #define IRQ_BIT(n)              (((n) - PXA_IRQ(0)) & 0x1f)
 
@@ -127,6 +129,36 @@ static struct irq_chip pxa_low_gpio_chip = {
         .irq_set_type   = pxa_set_low_gpio_type,
 };
 
+asmlinkage void __exception_irq_entry icip_handle_irq(struct pt_regs *regs)
+{
+        uint32_t icip, icmr, mask;
+
+        do {
+                icip = __raw_readl(IRQ_BASE + ICIP);
+                icmr = __raw_readl(IRQ_BASE + ICMR);
+                mask = icip & icmr;
+
+                if (mask == 0)
+                        break;
+
+                handle_IRQ(PXA_IRQ(fls(mask) - 1), regs);
+        } while (1);
+}
+
+asmlinkage void __exception_irq_entry ichp_handle_irq(struct pt_regs *regs)
+{
+        uint32_t ichp;
+
+        do {
+                __asm__ __volatile__("mrc p6, 0, %0, c5, c0, 0\n": "=r"(ichp));
+
+                if ((ichp & ICHP_VAL_IRQ) == 0)
+                        break;
+
+                handle_IRQ(PXA_IRQ(ICHP_IRQ(ichp)), regs);
+        } while (1);
+}
+
 static void __init pxa_init_low_gpio_irq(set_wake_t fn)
 {
         int irq;