1 files changed, 96 insertions, 0 deletions
diff --git a/arch/arm/mach-iop3xx/iop321-irq.c b/arch/arm/mach-iop3xx/iop321-irq.c
new file mode 100644
index 0000000..d42aae6
--- /dev/null
+++ b/arch/arm/mach-iop3xx/iop321-irq.c
@@ -0,0 +1,96 @@
+/*
+ * linux/arch/arm/mach-iop3xx/iop321-irq.c
+ *
+ * Generic IOP321 IRQ handling functionality
+ *
+ * Author: Rory Bolt <rorybolt@pacbell.net>
+ * Copyright (C) 2002 Rory Bolt
+ *
+ * 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.
+ *
+ * Added IOP3XX chipset and IQ80321 board masking code.
+ *
+ */
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+
+#include <asm/mach/irq.h>
+#include <asm/irq.h>
+#include <asm/hardware.h>
+
+#include <asm/mach-types.h>
+
+static u32 iop321_mask /* = 0 */;
+
+static inline void intctl_write(u32 val)
+{
+	asm volatile("mcr p6,0,%0,c0,c0,0"::"r" (val));
+}
+
+static inline void intstr_write(u32 val)
+{
+	asm volatile("mcr p6,0,%0,c4,c0,0"::"r" (val));
+}
+
+static void
+iop321_irq_mask (unsigned int irq)
+{
+
+	iop321_mask &= ~(1 << (irq - IOP321_IRQ_OFS));
+
+	intctl_write(iop321_mask);
+}
+
+static void
+iop321_irq_unmask (unsigned int irq)
+{
+	iop321_mask |= (1 << (irq - IOP321_IRQ_OFS));
+
+	intctl_write(iop321_mask);
+}
+
+struct irqchip ext_chip = {
+	.ack    = iop321_irq_mask,
+	.mask   = iop321_irq_mask,
+	.unmask = iop321_irq_unmask,
+};
+
+void __init iop321_init_irq(void)
+{
+	unsigned int i, tmp;
+
+	/* Enable access to coprocessor 6 for dealing with IRQs.
+	 * From RMK:
+	 * Basically, the Intel documentation here is poor.  It appears that
+	 * you need to set the bit to be able to access the coprocessor from
+	 * SVC mode.  Whether that allows access from user space or not is
+	 * unclear.
+	 */
+	asm volatile (
+		"mrc p15, 0, %0, c15, c1, 0\n\t"
+		"orr %0, %0, %1\n\t"
+		"mcr p15, 0, %0, c15, c1, 0\n\t"
+		/* The action is delayed, so we have to do this: */
+		"mrc p15, 0, %0, c15, c1, 0\n\t"
+		"mov %0, %0\n\t"
+		"sub pc, pc, #4"
+		: "=r" (tmp) : "i" (1 << 6) );
+
+	intctl_write(0);		// disable all interrupts
+	intstr_write(0);		// treat all as IRQ
+	if(machine_is_iq80321() ||
+	   machine_is_iq31244()) 	// all interrupts are inputs to chip
+		*IOP321_PCIIRSR = 0x0f;
+
+	for(i = IOP321_IRQ_OFS; i < NR_IOP321_IRQS; i++)
+	{
+		set_irq_chip(i, &ext_chip);
+		set_irq_handler(i, do_level_IRQ);
+		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+
+	}
+}
+