ARM: tegra: irq: convert to gic arch extensions

Replace the ugly hack that inserts legacy irq controller calls
into the irq call paths by reading and replacing the gic irq
chip with the new gic arch extensions.
Signed-off-by: Colin Cross <ccross@android.com>

arch/arm/mach-tegra/irq.c

 /*
- * Copyright (C) 2010 Google, Inc.
+ * Copyright (C) 2011 Google, Inc.
  *
  * Author:
- *	Colin Cross <ccross@google.com>
+ *	Colin Cross <ccross@android.com>
  *
  * Copyright (C) 2010, NVIDIA Corporation
  *
@@ -46,10 +46,6 @@ static u32 tegra_lp0_wake_enb;
 static u32 tegra_lp0_wake_level;
 static u32 tegra_lp0_wake_level_any;
 
-static void (*tegra_gic_mask_irq)(struct irq_data *d);
-static void (*tegra_gic_unmask_irq)(struct irq_data *d);
-static void (*tegra_gic_ack_irq)(struct irq_data *d);
-
 /* ensures that sufficient time is passed for a register write to
  * serialize into the 32KHz domain */
 static void pmc_32kwritel(u32 val, unsigned long offs)
@@ -103,58 +99,40 @@ void tegra_set_lp0_wake_pads(u32 wake_enb, u32 wake_level, u32 wake_any)
 
 static void tegra_mask(struct irq_data *d)
 {
-	tegra_gic_mask_irq(d);
-	tegra_legacy_mask_irq(d->irq);
+	if (d->irq >= 32)
+		tegra_legacy_mask_irq(d->irq);
 }
 
 static void tegra_unmask(struct irq_data *d)
 {
-	tegra_gic_unmask_irq(d);
-	tegra_legacy_unmask_irq(d->irq);
+	if (d->irq >= 32)
+		tegra_legacy_unmask_irq(d->irq);
 }
 
 static void tegra_ack(struct irq_data *d)
 {
-	tegra_legacy_force_irq_clr(d->irq);
-	tegra_gic_ack_irq(d);
+	if (d->irq >= 32)
+		tegra_legacy_force_irq_clr(d->irq);
 }
 
 static int tegra_retrigger(struct irq_data *d)
 {
+	if (d->irq < 32)
+		return 0;
+
 	tegra_legacy_force_irq_set(d->irq);
 	return 1;
 }
 
-static struct irq_chip tegra_irq = {
-	.name			= "PPI",
-	.irq_ack		= tegra_ack,
-	.irq_mask		= tegra_mask,
-	.irq_unmask		= tegra_unmask,
-	.irq_retrigger		= tegra_retrigger,
-};
-
 void __init tegra_init_irq(void)
 {
-	struct irq_chip *gic;
-	unsigned int i;
-	int irq;
-
 	tegra_init_legacy_irq();
 
+	gic_arch_extn.irq_ack = tegra_ack;
+	gic_arch_extn.irq_mask = tegra_mask;
+	gic_arch_extn.irq_unmask = tegra_unmask;
+	gic_arch_extn.irq_retrigger = tegra_retrigger;
+
 	gic_init(0, 29, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE),
 		 IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
-
-	gic = irq_get_chip(29);
-	tegra_gic_unmask_irq = gic->irq_unmask;
-	tegra_gic_mask_irq = gic->irq_mask;
-	tegra_gic_ack_irq = gic->irq_ack;
-#ifdef CONFIG_SMP
-	tegra_irq.irq_set_affinity = gic->irq_set_affinity;
-#endif
-
-	for (i = 0; i < INT_MAIN_NR; i++) {
-		irq = INT_PRI_BASE + i;
-		irq_set_chip_and_handler(irq, &tegra_irq, handle_level_irq);
-		set_irq_flags(irq, IRQF_VALID);
-	}
 }