[ARM] 4534/1: AT91x40 interrupt support

Interrupt setup support for the Atmel AT91x40 CPU family.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-at91/at91x40.c

+/*
+ * arch/arm/mach-at91/at91x40.c
+ *
+ * (C) Copyright 2007, Greg Ungerer <gerg@snapgear.com>
+ * Copyright (C) 2005 SAN People
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/mach/arch.h>
+#include <asm/arch/at91x40.h>
+#include <asm/arch/at91_st.h>
+#include "generic.h"
+
+/*
+ * This is used in the gpio code, stub locally.
+ */
+int clk_enable(struct clk *clk)
+{
+	return 0;
+}
+
+void __init at91x40_initialize(unsigned long main_clock)
+{
+	at91_extern_irq = (1 << AT91X40_ID_IRQ0) | (1 << AT91X40_ID_IRQ1)
+			| (1 << AT91X40_ID_IRQ2);
+}
+
+/*
+ * The default interrupt priority levels (0 = lowest, 7 = highest).
+ */
+static unsigned int at91x40_default_irq_priority[NR_AIC_IRQS] __initdata = {
+	7,	/* Advanced Interrupt Controller (FIQ) */
+	0,	/* System Peripherals */
+	0,	/* USART 0 */
+	0,	/* USART 1 */
+	2,	/* Timer Counter 0 */
+	2,	/* Timer Counter 1 */
+	2,	/* Timer Counter 2 */
+	0,	/* Watchdog timer */
+	0,	/* Parallel IO Controller A */
+	0,	/* Reserved */
+	0,	/* Reserved */
+	0,	/* Reserved */
+	0,	/* Reserved */
+	0,	/* Reserved */
+	0,	/* Reserved */
+	0,	/* Reserved */
+	0,	/* External IRQ0 */
+	0,	/* External IRQ1 */
+	0,	/* External IRQ2 */
+};
+
+void __init at91x40_init_interrupts(unsigned int priority[NR_AIC_IRQS])
+{
+	if (!priority)
+		priority = at91x40_default_irq_priority;
+
+	at91_aic_init(priority);
+}
+