From e851b58cb77b47a5c14267723bd6b76655d21840 Mon Sep 17 00:00:00 2001
From: Catalin Marinas <catalin.marinas@arm.com>
Date: Mon, 14 Jan 2013 12:39:31 +0000
Subject: [PATCH] arm64: Use irqchip_init() for interrupt controller
 initialisation

This patch uses the generic irqchip_init() function for initialising the
interrupt controller on arm64. It also adds several definitions required
by the ARM GIC irqchip driver but does not enable ARM_GIC yet.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
 arch/arm64/include/asm/exception.h |  1 +
 arch/arm64/include/asm/hardirq.h   |  5 +++++
 arch/arm64/include/asm/irq.h       |  1 +
 arch/arm64/kernel/irq.c            | 19 +++++++++----------
 4 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h
index ac63519b7b90..0303705fcad6 100644
--- a/arch/arm64/include/asm/exception.h
+++ b/arch/arm64/include/asm/exception.h
@@ -19,5 +19,6 @@
 #define __ASM_EXCEPTION_H
 
 #define __exception	__attribute__((section(".exception.text")))
+#define __exception_irq_entry	__exception
 
 #endif	/* __ASM_EXCEPTION_H */
diff --git a/arch/arm64/include/asm/hardirq.h b/arch/arm64/include/asm/hardirq.h
index 507546353d62..990c051e7829 100644
--- a/arch/arm64/include/asm/hardirq.h
+++ b/arch/arm64/include/asm/hardirq.h
@@ -49,4 +49,9 @@ static inline void ack_bad_irq(unsigned int irq)
 
 extern void handle_IRQ(unsigned int, struct pt_regs *);
 
+/*
+ * No arch-specific IRQ flags.
+ */
+#define set_irq_flags(irq, flags)
+
 #endif /* __ASM_HARDIRQ_H */
diff --git a/arch/arm64/include/asm/irq.h b/arch/arm64/include/asm/irq.h
index a4e1cad3202a..0332fc077f6e 100644
--- a/arch/arm64/include/asm/irq.h
+++ b/arch/arm64/include/asm/irq.h
@@ -4,5 +4,6 @@
 #include <asm-generic/irq.h>
 
 extern void (*handle_arch_irq)(struct pt_regs *);
+extern void set_handle_irq(void (*handle_irq)(struct pt_regs *));
 
 #endif
diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index 0373c6609eaf..ecb3354292ed 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -25,7 +25,7 @@
 #include <linux/irq.h>
 #include <linux/smp.h>
 #include <linux/init.h>
-#include <linux/of_irq.h>
+#include <linux/irqchip.h>
 #include <linux/seq_file.h>
 #include <linux/ratelimit.h>
 
@@ -67,18 +67,17 @@ void handle_IRQ(unsigned int irq, struct pt_regs *regs)
 	set_irq_regs(old_regs);
 }
 
-/*
- * Interrupt controllers supported by the kernel.
- */
-static const struct of_device_id intctrl_of_match[] __initconst = {
-	/* IRQ controllers { .compatible, .data } info to go here */
-	{}
-};
+void __init set_handle_irq(void (*handle_irq)(struct pt_regs *))
+{
+	if (handle_arch_irq)
+		return;
+
+	handle_arch_irq = handle_irq;
+}
 
 void __init init_IRQ(void)
 {
-	of_irq_init(intctrl_of_match);
-
+	irqchip_init();
 	if (!handle_arch_irq)
 		panic("No interrupt controller found.");
 }