1 files changed, 94 insertions, 0 deletions
diff --git a/arch/arm/mach-ns9xxx/irq.c b/arch/arm/mach-ns9xxx/irq.c
new file mode 100644
index 0000000..83d9272
--- /dev/null
+++ b/arch/arm/mach-ns9xxx/irq.c
@@ -0,0 +1,94 @@
+/*
+ * arch/arm/mach-ns9xxx/irq.c
+ *
+ * Copyright (C) 2006,2007 by Digi International Inc.
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+#include <linux/interrupt.h>
+#include <asm/mach/irq.h>
+#include <asm/mach-types.h>
+#include <asm/arch-ns9xxx/regs-sys.h>
+#include <asm/arch-ns9xxx/irqs.h>
+#include <asm/arch-ns9xxx/board.h>
+
+#include "generic.h"
+
+static void ns9xxx_ack_irq_timer(unsigned int irq)
+{
+	u32 tc = SYS_TC(irq - IRQ_TIMER0);
+
+	REGSET(tc, SYS_TCx, INTC, SET);
+	SYS_TC(irq - IRQ_TIMER0) = tc;
+
+	REGSET(tc, SYS_TCx, INTC, UNSET);
+	SYS_TC(irq - IRQ_TIMER0) = tc;
+}
+
+void (*ns9xxx_ack_irq_functions[NR_IRQS])(unsigned int) = {
+	[IRQ_TIMER0] = ns9xxx_ack_irq_timer,
+	[IRQ_TIMER1] = ns9xxx_ack_irq_timer,
+	[IRQ_TIMER2] = ns9xxx_ack_irq_timer,
+	[IRQ_TIMER3] = ns9xxx_ack_irq_timer,
+};
+
+static void ns9xxx_mask_irq(unsigned int irq)
+{
+	/* XXX: better use cpp symbols */
+	SYS_IC(irq / 4) &= ~(1 << (7 + 8 * (3 - (irq & 3))));
+}
+
+static void ns9xxx_ack_irq(unsigned int irq)
+{
+	if (!ns9xxx_ack_irq_functions[irq]) {
+		printk(KERN_ERR "no ack function for irq %u\n", irq);
+		BUG();
+	}
+
+	ns9xxx_ack_irq_functions[irq](irq);
+	SYS_ISRADDR = 0;
+}
+
+static void ns9xxx_maskack_irq(unsigned int irq)
+{
+	ns9xxx_mask_irq(irq);
+	ns9xxx_ack_irq(irq);
+}
+
+static void ns9xxx_unmask_irq(unsigned int irq)
+{
+	/* XXX: better use cpp symbols */
+	SYS_IC(irq / 4) |= 1 << (7 + 8 * (3 - (irq & 3)));
+}
+
+static struct irq_chip ns9xxx_chip = {
+	.ack		= ns9xxx_ack_irq,
+	.mask		= ns9xxx_mask_irq,
+	.mask_ack	= ns9xxx_maskack_irq,
+	.unmask		= ns9xxx_unmask_irq,
+};
+
+void __init ns9xxx_init_irq(void)
+{
+	int i;
+
+	/* disable all IRQs */
+	for (i = 0; i < 8; ++i)
+		SYS_IC(i) = (4 * i) << 24 | (4 * i + 1) << 16 |
+			(4 * i + 2) << 8 | (4 * i + 3);
+
+	/* simple interrupt prio table:
+	 * prio(x) < prio(y) <=> x < y
+	 */
+	for (i = 0; i < 32; ++i)
+		SYS_IVA(i) = i;
+
+	for (i = IRQ_WATCHDOG; i <= IRQ_EXT3; ++i) {
+		set_irq_chip(i, &ns9xxx_chip);
+		set_irq_handler(i, handle_level_irq);
+		set_irq_flags(i, IRQF_VALID);
+	}
+}