LXR linux/arch/mips/kernel/irq-rm9000.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 RM9000 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#include <linux/module.h>
  17
  18#include <asm/irq_cpu.h>
  19#include <asm/mipsregs.h>
  20#include <asm/system.h>
  21
  22static inline void unmask_rm9k_irq(unsigned int irq)
  23{
  24        set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
  25}
  26
  27static inline void mask_rm9k_irq(unsigned int irq)
  28{
  29        clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
  30}
  31
  32static inline void rm9k_cpu_irq_enable(unsigned int irq)
  33{
  34        unsigned long flags;
  35
  36        local_irq_save(flags);
  37        unmask_rm9k_irq(irq);
  38        local_irq_restore(flags);
  39}
  40
  41/*
  42 * Performance counter interrupts are global on all processors.
  43 */
  44static void local_rm9k_perfcounter_irq_startup(void *args)
  45{
  46        unsigned int irq = (unsigned int) args;
  47
  48        rm9k_cpu_irq_enable(irq);
  49}
  50
  51static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
  52{
  53        on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 1);
  54
  55        return 0;
  56}
  57
  58static void local_rm9k_perfcounter_irq_shutdown(void *args)
  59{
  60        unsigned int irq = (unsigned int) args;
  61        unsigned long flags;
  62
  63        local_irq_save(flags);
  64        mask_rm9k_irq(irq);
  65        local_irq_restore(flags);
  66}
  67
  68static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
  69{
  70        on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 1);
  71}
  72
  73static struct irq_chip rm9k_irq_controller = {
  74        .name = "RM9000",
  75        .ack = mask_rm9k_irq,
  76        .mask = mask_rm9k_irq,
  77        .mask_ack = mask_rm9k_irq,
  78        .unmask = unmask_rm9k_irq,
  79        .eoi    = unmask_rm9k_irq
  80};
  81
  82static struct irq_chip rm9k_perfcounter_irq = {
  83        .name = "RM9000",
  84        .startup = rm9k_perfcounter_irq_startup,
  85        .shutdown = rm9k_perfcounter_irq_shutdown,
  86        .ack = mask_rm9k_irq,
  87        .mask = mask_rm9k_irq,
  88        .mask_ack = mask_rm9k_irq,
  89        .unmask = unmask_rm9k_irq,
  90};
  91
  92unsigned int rm9000_perfcount_irq;
  93
  94EXPORT_SYMBOL(rm9000_perfcount_irq);
  95
  96void __init rm9k_cpu_irq_init(void)
  97{
  98        int base = RM9K_CPU_IRQ_BASE;
  99        int i;
 100
 101        clear_c0_intcontrol(0x0000f000);                /* Mask all */
 102
 103        for (i = base; i < base + 4; i++)
 104                set_irq_chip_and_handler(i, &rm9k_irq_controller,
 105                                         handle_level_irq);
 106
 107        rm9000_perfcount_irq = base + 1;
 108        set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
 109                                 handle_percpu_irq);
 110}
 111