1 files changed, 97 insertions, 0 deletions

diff --git a/arch/arm/mach-iop32x/irq.c b/arch/arm/mach-iop32x/irq.c
new file mode 100644
index 000000000000..c5f633d2d632
--- /dev/null
+++ b/arch/arm/mach-iop32x/irq.c
@@ -0,0 +1,97 @@
+/*
+ * linux/arch/arm/mach-iop32x/irq.c
+ *
+ * Generic IOP32X 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 irq_chip ext_chip = {
+        .name   = "IOP",
+        .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_IRQS; i++)
+        {
+                set_irq_chip(i, &ext_chip);
+                set_irq_handler(i, do_level_IRQ);
+                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+
+        }
+}
+