ARM: GIC: Add global gic_handle_irq() function

Provide the GIC code with a low level handler that can be used
by platforms using CONFIG_MULTI_IRQ_HANDLER.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

2 files changed, 28 insertions, 0 deletions

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 43cb6f1a7cf2..3c78b7c60691 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -40,6 +40,7 @@
 #include <linux/slab.h>
 
 #include <asm/irq.h>
+#include <asm/exception.h>
 #include <asm/mach/irq.h>
 #include <asm/hardware/gic.h>
 
@@ -272,6 +273,32 @@ static int gic_set_wake(struct irq_data *d, unsigned int on)
 #define gic_set_wake    NULL
 #endif
 
+asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
+{
+        u32 irqstat, irqnr;
+        struct gic_chip_data *gic = &gic_data[0];
+        void __iomem *cpu_base = gic_data_cpu_base(gic);
+
+        do {
+                irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
+                irqnr = irqstat & ~0x1c00;
+
+                if (likely(irqnr > 15 && irqnr < 1021)) {
+                        irqnr = irq_domain_to_irq(&gic->domain, irqnr);
+                        handle_IRQ(irqnr, regs);
+                        continue;
+                }
+                if (irqnr < 16) {
+                        writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
+#ifdef CONFIG_SMP
+                        handle_IPI(irqnr, regs);
+#endif
+                        continue;
+                }
+                break;
+        } while (1);
+}
+
 static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
 {
         struct gic_chip_data *chip_data = irq_get_handler_data(irq);
diff --git a/arch/arm/include/asm/hardware/gic.h b/arch/arm/include/asm/hardware/gic.h
index 2721d90625e5..ecf7c02fa16c 100644
--- a/arch/arm/include/asm/hardware/gic.h
+++ b/arch/arm/include/asm/hardware/gic.h
@@ -43,6 +43,7 @@ void gic_init_bases(unsigned int, int, void __iomem *, void __iomem *,
                     u32 offset);
 int gic_of_init(struct device_node *node, struct device_node *parent);
 void gic_secondary_init(unsigned int);
+void gic_handle_irq(struct pt_regs *regs);
 void gic_cascade_irq(unsigned int gic_nr, unsigned int irq);
 void gic_raise_softirq(const struct cpumask *mask, unsigned int irq);