LXR linux/arch/mips/cobalt/irq.c

   1/*
   2 * IRQ vector handles
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle
   9 */
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/irq.h>
  13#include <linux/interrupt.h>
  14#include <linux/pci.h>
  15
  16#include <asm/i8259.h>
  17#include <asm/irq_cpu.h>
  18#include <asm/irq_gt641xx.h>
  19#include <asm/gt64120.h>
  20
  21#include <irq.h>
  22
  23asmlinkage void plat_irq_dispatch(void)
  24{
  25        unsigned pending = read_c0_status() & read_c0_cause() & ST0_IM;
  26        int irq;
  27
  28        if (pending & CAUSEF_IP2)
  29                gt641xx_irq_dispatch();
  30        else if (pending & CAUSEF_IP6) {
  31                irq = i8259_irq();
  32                if (irq < 0)
  33                        spurious_interrupt();
  34                else
  35                        do_IRQ(irq);
  36        } else if (pending & CAUSEF_IP3)
  37                do_IRQ(MIPS_CPU_IRQ_BASE + 3);
  38        else if (pending & CAUSEF_IP4)
  39                do_IRQ(MIPS_CPU_IRQ_BASE + 4);
  40        else if (pending & CAUSEF_IP5)
  41                do_IRQ(MIPS_CPU_IRQ_BASE + 5);
  42        else if (pending & CAUSEF_IP7)
  43                do_IRQ(MIPS_CPU_IRQ_BASE + 7);
  44        else
  45                spurious_interrupt();
  46}
  47
  48static struct irqaction cascade = {
  49        .handler        = no_action,
  50        .name           = "cascade",
  51        .flags          = IRQF_NO_THREAD,
  52};
  53
  54void __init arch_init_irq(void)
  55{
  56        mips_cpu_irq_init();
  57        gt641xx_irq_init();
  58        init_i8259_irqs();
  59
  60        setup_irq(GT641XX_CASCADE_IRQ, &cascade);
  61        setup_irq(I8259_CASCADE_IRQ, &cascade);
  62}
  63