LXR linux/arch/arm/mach-footbridge/isa-timer.c

   1/*
   2 *  linux/arch/arm/mach-footbridge/isa-timer.c
   3 *
   4 *  Copyright (C) 1998 Russell King.
   5 *  Copyright (C) 1998 Phil Blundell
   6 */
   7#include <linux/clockchips.h>
   8#include <linux/i8253.h>
   9#include <linux/init.h>
  10#include <linux/interrupt.h>
  11#include <linux/irq.h>
  12#include <linux/spinlock.h>
  13#include <linux/timex.h>
  14
  15#include <asm/irq.h>
  16#include <asm/mach/time.h>
  17
  18#include "common.h"
  19
  20static irqreturn_t pit_timer_interrupt(int irq, void *dev_id)
  21{
  22        struct clock_event_device *ce = dev_id;
  23        ce->event_handler(ce);
  24        return IRQ_HANDLED;
  25}
  26
  27static struct irqaction pit_timer_irq = {
  28        .name           = "pit",
  29        .handler        = pit_timer_interrupt,
  30        .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
  31        .dev_id         = &i8253_clockevent,
  32};
  33
  34static void __init isa_timer_init(void)
  35{
  36        clocksource_i8253_init();
  37
  38        setup_irq(i8253_clockevent.irq, &pit_timer_irq);
  39        clockevent_i8253_init(false);
  40}
  41
  42struct sys_timer isa_timer = {
  43        .init           = isa_timer_init,
  44};
  45