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irq-rm9000.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 RM9000 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 <linux/module.h>

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

static inline void unmask_rm9k_irq(unsigned int irq)
{
      set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
}

static inline void mask_rm9k_irq(unsigned int irq)
{
      clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
}

static inline void rm9k_cpu_irq_enable(unsigned int irq)
{
      unsigned long flags;

      local_irq_save(flags);
      unmask_rm9k_irq(irq);
      local_irq_restore(flags);
}

/*
 * Performance counter interrupts are global on all processors.
 */
static void local_rm9k_perfcounter_irq_startup(void *args)
{
      unsigned int irq = (unsigned int) args;

      rm9k_cpu_irq_enable(irq);
}

static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
{
      on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 1);

      return 0;
}

static void local_rm9k_perfcounter_irq_shutdown(void *args)
{
      unsigned int irq = (unsigned int) args;
      unsigned long flags;

      local_irq_save(flags);
      mask_rm9k_irq(irq);
      local_irq_restore(flags);
}

static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
{
      on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 1);
}

static struct irq_chip rm9k_irq_controller = {
      .name = "RM9000",
      .ack = mask_rm9k_irq,
      .mask = mask_rm9k_irq,
      .mask_ack = mask_rm9k_irq,
      .unmask = unmask_rm9k_irq,
      .eoi  = unmask_rm9k_irq
};

static struct irq_chip rm9k_perfcounter_irq = {
      .name = "RM9000",
      .startup = rm9k_perfcounter_irq_startup,
      .shutdown = rm9k_perfcounter_irq_shutdown,
      .ack = mask_rm9k_irq,
      .mask = mask_rm9k_irq,
      .mask_ack = mask_rm9k_irq,
      .unmask = unmask_rm9k_irq,
};

unsigned int rm9000_perfcount_irq;

EXPORT_SYMBOL(rm9000_perfcount_irq);

void __init rm9k_cpu_irq_init(void)
{
      int base = RM9K_CPU_IRQ_BASE;
      int i;

      clear_c0_intcontrol(0x0000f000);          /* Mask all */

      for (i = base; i < base + 4; i++)
            set_irq_chip_and_handler(i, &rm9k_irq_controller,
                               handle_level_irq);

      rm9000_perfcount_irq = base + 1;
      set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
                         handle_percpu_irq);
}

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