ARM: omap2/3: Add global omap2/3_intc_handle_irq() functions

Provide the OMAP2/3 IRQ code with low level handlers that can be used
by platforms using CONFIG_MULTI_IRQ_HANDLER. Though the handlers are
written in C, the compiled code looks very similar to its assembly
counterpart (at least with my gcc 4.4.1).

Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

2 files changed, 52 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
index 65f1be6a182c..ec52bee0e089 100644
--- a/arch/arm/mach-omap2/irq.c
+++ b/arch/arm/mach-omap2/irq.c
@@ -15,6 +15,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <mach/hardware.h>
+#include <asm/exception.h>
 #include <asm/mach/irq.h>
 
 
@@ -35,6 +36,11 @@
 /* Number of IRQ state bits in each MIR register */
 #define IRQ_BITS_PER_REG        32
 
+#define OMAP2_IRQ_BASE          OMAP2_L4_IO_ADDRESS(OMAP24XX_IC_BASE)
+#define OMAP3_IRQ_BASE          OMAP2_L4_IO_ADDRESS(OMAP34XX_IC_BASE)
+#define INTCPS_SIR_IRQ_OFFSET   0x0040  /* omap2/3 active interrupt offset */
+#define ACTIVEIRQ_MASK          0x7f    /* omap2/3 active interrupt bits */
+
 /*
  * OMAP2 has a number of different interrupt controllers, each interrupt
  * controller is identified as its own "bank". Register definitions are
@@ -191,6 +197,44 @@ void __init ti816x_init_irq(void)
         omap_init_irq(OMAP34XX_IC_BASE, 128);
 }
 
+static inline void omap_intc_handle_irq(void __iomem *base_addr, struct pt_regs *regs)
+{
+        u32 irqnr;
+
+        do {
+                irqnr = readl_relaxed(base_addr + 0x98);
+                if (irqnr)
+                        goto out;
+
+                irqnr = readl_relaxed(base_addr + 0xb8);
+                if (irqnr)
+                        goto out;
+
+                irqnr = readl_relaxed(base_addr + 0xd8);
+#ifdef CONFIG_SOC_OMAPTI816X
+                if (irqnr)
+                        goto out;
+                irqnr = readl_relaxed(base_addr + 0xf8);
+#endif
+
+out:
+                if (!irqnr)
+                        break;
+
+                irqnr = readl_relaxed(base_addr + INTCPS_SIR_IRQ_OFFSET);
+                irqnr &= ACTIVEIRQ_MASK;
+
+                if (irqnr)
+                        handle_IRQ(irqnr, regs);
+        } while (irqnr);
+}
+
+asmlinkage void __exception_irq_entry omap2_intc_handle_irq(struct pt_regs *regs)
+{
+        void __iomem *base_addr = OMAP2_IRQ_BASE;
+        omap_intc_handle_irq(base_addr, regs);
+}
+
 #ifdef CONFIG_ARCH_OMAP3
 static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];
 
@@ -263,4 +307,10 @@ void omap3_intc_resume_idle(void)
         /* Re-enable autoidle */
         intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG);
 }
+
+asmlinkage void __exception_irq_entry omap3_intc_handle_irq(struct pt_regs *regs)
+{
+        void __iomem *base_addr = OMAP3_IRQ_BASE;
+        omap_intc_handle_irq(base_addr, regs);
+}
 #endif /* CONFIG_ARCH_OMAP3 */
diff --git a/arch/arm/plat-omap/include/plat/irqs.h b/arch/arm/plat-omap/include/plat/irqs.h
index 30e10719b774..8b19a63fab68 100644
--- a/arch/arm/plat-omap/include/plat/irqs.h
+++ b/arch/arm/plat-omap/include/plat/irqs.h
@@ -448,6 +448,8 @@ void omap_intc_restore_context(void);
 void omap3_intc_suspend(void);
 void omap3_intc_prepare_idle(void);
 void omap3_intc_resume_idle(void);
+void omap2_intc_handle_irq(struct pt_regs *regs);
+void omap3_intc_handle_irq(struct pt_regs *regs);
 #endif
 
 #include <mach/hardware.h>