LXR linux/arch/mips/kernel/irq-rm7000.c

   1/*
   2 * Copyright (C) 2003 Ralf Baechle
   3 *
   4 * This program is free software; you can redistribute  it and/or modify it
   5 * under  the terms of  the GNU General  Public License as published by the
   6 * Free Software Foundation;  either version 2 of the  License, or (at your
   7 * option) any later version.
   8 *
   9 * Handler for RM7000 extended interrupts.  These are a non-standard
  10 * feature so we handle them separately from standard interrupts.
  11 */
  12#include <linux/init.h>
  13#include <linux/interrupt.h>
  14#include <linux/irq.h>
  15#include <linux/kernel.h>
  16
  17#include <asm/irq_cpu.h>
  18#include <asm/mipsregs.h>
  19#include <asm/system.h>
  20
  21static inline void unmask_rm7k_irq(unsigned int irq)
  22{
  23        set_c0_intcontrol(0x100 << (irq - RM7K_CPU_IRQ_BASE));
  24}
  25
  26static inline void mask_rm7k_irq(unsigned int irq)
  27{
  28        clear_c0_intcontrol(0x100 << (irq - RM7K_CPU_IRQ_BASE));
  29}
  30
  31static struct irq_chip rm7k_irq_controller = {
  32        .name = "RM7000",
  33        .ack = mask_rm7k_irq,
  34        .mask = mask_rm7k_irq,
  35        .mask_ack = mask_rm7k_irq,
  36        .unmask = unmask_rm7k_irq,
  37        .eoi    = unmask_rm7k_irq
  38};
  39
  40void __init rm7k_cpu_irq_init(void)
  41{
  42        int base = RM7K_CPU_IRQ_BASE;
  43        int i;
  44
  45        clear_c0_intcontrol(0x00000f00);                /* Mask all */
  46
  47        for (i = base; i < base + 4; i++)
  48                set_irq_chip_and_handler(i, &rm7k_irq_controller,
  49                                         handle_percpu_irq);
  50}
  51