irq.c

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/*
 * IRQ vector handles
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/pci.h>

#include <asm/i8259.h>
#include <asm/irq_cpu.h>
#include <asm/irq_gt641xx.h>
#include <asm/gt64120.h>

#include <irq.h>

asmlinkage void plat_irq_dispatch(void)
{
    unsigned pending = read_c0_status() & read_c0_cause() & ST0_IM;
    int irq;

    if (pending & CAUSEF_IP2)
        gt641xx_irq_dispatch();
    else if (pending & CAUSEF_IP6) {
        irq = i8259_irq();
        if (irq < 0)
            spurious_interrupt();
        else
            do_IRQ(irq);
    } else if (pending & CAUSEF_IP3)
        do_IRQ(MIPS_CPU_IRQ_BASE + 3);
    else if (pending & CAUSEF_IP4)
        do_IRQ(MIPS_CPU_IRQ_BASE + 4);
    else if (pending & CAUSEF_IP5)
        do_IRQ(MIPS_CPU_IRQ_BASE + 5);
    else if (pending & CAUSEF_IP7)
        do_IRQ(MIPS_CPU_IRQ_BASE + 7);
    else
        spurious_interrupt();
}

static struct irqaction cascade = {
    .handler    = no_action,
    .name       = "cascade",
    .flags      = IRQF_NO_THREAD,
};

void __init arch_init_irq(void)
{
    mips_cpu_irq_init();
    gt641xx_irq_init();
    init_i8259_irqs();

    setup_irq(GT641XX_CASCADE_IRQ, &cascade);
    setup_irq(I8259_CASCADE_IRQ, &cascade);
}