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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/arm/mach-footbridge/isa-timer.c
   4  *
   5  *  Copyright (C) 1998 Russell King.
   6  *  Copyright (C) 1998 Phil Blundell
   7  */
   8 #include <linux/clockchips.h>
   9 #include <linux/i8253.h>
  10 #include <linux/init.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/irq.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/timex.h>
  15
  16 #include <asm/irq.h>
  17 #include <asm/mach/time.h>
  18
  19 #include "common.h"
  20
  21 static irqreturn_t pit_timer_interrupt(int irq, void *dev_id)
  22 {
  23         struct clock_event_device *ce = dev_id;
  24         ce->event_handler(ce);
  25         return IRQ_HANDLED;
  26 }
  27
  28 static struct irqaction pit_timer_irq = {
  29         .name           = "pit",
  30         .handler        = pit_timer_interrupt,
  31         .flags          = IRQF_TIMER | IRQF_IRQPOLL,
  32         .dev_id         = &i8253_clockevent,
  33 };
  34
  35 void __init isa_timer_init(void)
  36 {
  37         clocksource_i8253_init();
  38
  39         setup_irq(i8253_clockevent.irq, &pit_timer_irq);
  40         clockevent_i8253_init(false);
  41 }