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irq-rm7000.c

/*
 * Copyright (C) 2003 Ralf Baechle
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 * Handler for RM7000 extended interrupts.  These are a non-standard
 * feature so we handle them separately from standard interrupts.
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>

#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/system.h>

static inline void unmask_rm7k_irq(unsigned int irq)
{
      set_c0_intcontrol(0x100 << (irq - RM7K_CPU_IRQ_BASE));
}

static inline void mask_rm7k_irq(unsigned int irq)
{
      clear_c0_intcontrol(0x100 << (irq - RM7K_CPU_IRQ_BASE));
}

static struct irq_chip rm7k_irq_controller = {
      .name = "RM7000",
      .ack = mask_rm7k_irq,
      .mask = mask_rm7k_irq,
      .mask_ack = mask_rm7k_irq,
      .unmask = unmask_rm7k_irq,
      .eoi  = unmask_rm7k_irq
};

void __init rm7k_cpu_irq_init(void)
{
      int base = RM7K_CPU_IRQ_BASE;
      int i;

      clear_c0_intcontrol(0x00000f00);          /* Mask all */

      for (i = base; i < base + 4; i++)
            set_irq_chip_and_handler(i, &rm7k_irq_controller,
                               handle_percpu_irq);
}

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