Simple conversion which simply uses the fact that the second irq chip
base address has offset 0x04 to the first one.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/arm/mach-davinci/irq.c |   90 ++++++++------------------------------------
 1 file changed, 18 insertions(+), 72 deletions(-)

Index: linux-2.6/arch/arm/mach-davinci/irq.c
===================================================================
--- linux-2.6.orig/arch/arm/mach-davinci/irq.c
+++ linux-2.6/arch/arm/mach-davinci/irq.c
@@ -29,8 +29,6 @@
 #include <mach/common.h>
 #include <asm/mach/irq.h>
 
-#define IRQ_BIT(irq)		((irq) & 0x1f)
-
 #define FIQ_REG0_OFFSET		0x0000
 #define FIQ_REG1_OFFSET		0x0004
 #define IRQ_REG0_OFFSET		0x0008
@@ -42,78 +40,32 @@
 #define IRQ_INTPRI0_REG_OFFSET	0x0030
 #define IRQ_INTPRI7_REG_OFFSET	0x004C
 
-static inline unsigned int davinci_irq_readl(int offset)
-{
-	return __raw_readl(davinci_intc_base + offset);
-}
-
 static inline void davinci_irq_writel(unsigned long value, int offset)
 {
 	__raw_writel(value, davinci_intc_base + offset);
 }
 
-/* Disable interrupt */
-static void davinci_mask_irq(struct irq_data *d)
-{
-	unsigned int mask;
-	u32 l;
-
-	mask = 1 << IRQ_BIT(d->irq);
-
-	if (d->irq > 31) {
-		l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
-		l &= ~mask;
-		davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
-	} else {
-		l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
-		l &= ~mask;
-		davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
-	}
-}
-
-/* Enable interrupt */
-static void davinci_unmask_irq(struct irq_data *d)
+static __init void
+davinci_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
 {
-	unsigned int mask;
-	u32 l;
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
 
-	mask = 1 << IRQ_BIT(d->irq);
-
-	if (d->irq > 31) {
-		l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
-		l |= mask;
-		davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
-	} else {
-		l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
-		l |= mask;
-		davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
-	}
-}
-
-/* EOI interrupt */
-static void davinci_ack_irq(struct irq_data *d)
-{
-	unsigned int mask;
-
-	mask = 1 << IRQ_BIT(d->irq);
-
-	if (d->irq > 31)
-		davinci_irq_writel(mask, IRQ_REG1_OFFSET);
-	else
-		davinci_irq_writel(mask, IRQ_REG0_OFFSET);
+	gc = irq_alloc_generic_chip("AINTC", 1, irq_start, base, handle_edge_irq);
+	ct = gc->chip_types;
+	ct->chip.irq_ack = irq_gc_ack;
+	ct->chip.irq_mask = irq_gc_mask_clr_bit;
+	ct->chip.irq_unmask = irq_gc_mask_set_bit;
+
+	ct->regs.ack = IRQ_REG0_OFFSET;
+	ct->regs.mask = IRQ_ENT_REG0_OFFSET;
+	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_NOREQUEST | IRQ_NOPROBE, 0);
 }
 
-static struct irq_chip davinci_irq_chip_0 = {
-	.name		= "AINTC",
-	.irq_ack	= davinci_ack_irq,
-	.irq_mask	= davinci_mask_irq,
-	.irq_unmask	= davinci_unmask_irq,
-};
-
 /* ARM Interrupt Controller Initialization */
 void __init davinci_irq_init(void)
 {
-	unsigned i;
+	unsigned i, j;
 	const u8 *davinci_def_priorities = davinci_soc_info.intc_irq_prios;
 
 	davinci_intc_type = DAVINCI_INTC_TYPE_AINTC;
@@ -144,7 +96,6 @@ void __init davinci_irq_init(void)
 	davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
 
 	for (i = IRQ_INTPRI0_REG_OFFSET; i <= IRQ_INTPRI7_REG_OFFSET; i += 4) {
-		unsigned	j;
 		u32		pri;
 
 		for (j = 0, pri = 0; j < 32; j += 4, davinci_def_priorities++)
@@ -152,13 +103,8 @@ void __init davinci_irq_init(void)
 		davinci_irq_writel(pri, i);
 	}
 
-	/* set up genirq dispatch for ARM INTC */
-	for (i = 0; i < davinci_soc_info.intc_irq_num; i++) {
-		irq_set_chip(i, &davinci_irq_chip_0);
-		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
-		if (i != IRQ_TINT1_TINT34)
-			irq_set_handler(i, handle_edge_irq);
-		else
-			irq_set_handler(i, handle_level_irq);
-	}
+	for (i = 0, j= 0; i < davinci_soc_info.intc_irq_num; i += 32, j += 0x04)
+		davinci_alloc_gc(davinci_intc_base + j, i, 32);
+
+	irq_set_handler(IRQ_TINT1_TINT34, handle_level_irq);
 }