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
  20 static 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
  27 static 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
  34 static 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
  42 struct sys_timer isa_timer = {
  43         .init           = isa_timer_init,
  44 };