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
  20static inline void unmask_rm7k_irq(struct irq_data *d)
  21{
  22        set_c0_intcontrol(0x100 << (d->irq - RM7K_CPU_IRQ_BASE));
  23}
  24
  25static inline void mask_rm7k_irq(struct irq_data *d)
  26{
  27        clear_c0_intcontrol(0x100 << (d->irq - RM7K_CPU_IRQ_BASE));
  28}
  29
  30static struct irq_chip rm7k_irq_controller = {
  31        .name = "RM7000",
  32        .irq_ack = mask_rm7k_irq,
  33        .irq_mask = mask_rm7k_irq,
  34        .irq_mask_ack = mask_rm7k_irq,
  35        .irq_unmask = unmask_rm7k_irq,
  36        .irq_eoi = unmask_rm7k_irq
  37};
  38
  39void __init rm7k_cpu_irq_init(void)
  40{
  41        int base = RM7K_CPU_IRQ_BASE;
  42        int i;
  43
  44        clear_c0_intcontrol(0x00000f00);                /* Mask all */
  45
  46        for (i = base; i < base + 4; i++)
  47                irq_set_chip_and_handler(i, &rm7k_irq_controller,
  48                                         handle_percpu_irq);
  49}
  50