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/kernel.h>
  15#include <linux/module.h>
  16
  17#include <asm/irq_cpu.h>
  18#include <asm/mipsregs.h>
  19#include <asm/system.h>
  20
  21static inline void unmask_rm9k_irq(unsigned int irq)
  22{
  23        set_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
  24}
  25
  26static inline void mask_rm9k_irq(unsigned int irq)
  27{
  28        clear_c0_intcontrol(0x1000 << (irq - RM9K_CPU_IRQ_BASE));
  29}
  30
  31static inline void rm9k_cpu_irq_enable(unsigned int irq)
  32{
  33        unsigned long flags;
  34
  35        local_irq_save(flags);
  36        unmask_rm9k_irq(irq);
  37        local_irq_restore(flags);
  38}
  39
  40/*
  41 * Performance counter interrupts are global on all processors.
  42 */
  43static void local_rm9k_perfcounter_irq_startup(void *args)
  44{
  45        unsigned int irq = (unsigned int) args;
  46
  47        rm9k_cpu_irq_enable(irq);
  48}
  49
  50static unsigned int rm9k_perfcounter_irq_startup(unsigned int irq)
  51{
  52        on_each_cpu(local_rm9k_perfcounter_irq_startup, (void *) irq, 1);
  53
  54        return 0;
  55}
  56
  57static void local_rm9k_perfcounter_irq_shutdown(void *args)
  58{
  59        unsigned int irq = (unsigned int) args;
  60        unsigned long flags;
  61
  62        local_irq_save(flags);
  63        mask_rm9k_irq(irq);
  64        local_irq_restore(flags);
  65}
  66
  67static void rm9k_perfcounter_irq_shutdown(unsigned int irq)
  68{
  69        on_each_cpu(local_rm9k_perfcounter_irq_shutdown, (void *) irq, 1);
  70}
  71
  72static struct irq_chip rm9k_irq_controller = {
  73        .name = "RM9000",
  74        .ack = mask_rm9k_irq,
  75        .mask = mask_rm9k_irq,
  76        .mask_ack = mask_rm9k_irq,
  77        .unmask = unmask_rm9k_irq,
  78        .eoi    = unmask_rm9k_irq
  79};
  80
  81static struct irq_chip rm9k_perfcounter_irq = {
  82        .name = "RM9000",
  83        .startup = rm9k_perfcounter_irq_startup,
  84        .shutdown = rm9k_perfcounter_irq_shutdown,
  85        .ack = mask_rm9k_irq,
  86        .mask = mask_rm9k_irq,
  87        .mask_ack = mask_rm9k_irq,
  88        .unmask = unmask_rm9k_irq,
  89};
  90
  91unsigned int rm9000_perfcount_irq;
  92
  93EXPORT_SYMBOL(rm9000_perfcount_irq);
  94
  95void __init rm9k_cpu_irq_init(void)
  96{
  97        int base = RM9K_CPU_IRQ_BASE;
  98        int i;
  99
 100        clear_c0_intcontrol(0x0000f000);                /* Mask all */
 101
 102        for (i = base; i < base + 4; i++)
 103                set_irq_chip_and_handler(i, &rm9k_irq_controller,
 104                                         handle_level_irq);
 105
 106        rm9000_perfcount_irq = base + 1;
 107        set_irq_chip_and_handler(rm9000_perfcount_irq, &rm9k_perfcounter_irq,
 108                                 handle_percpu_irq);
 109}
 110