LXR linux/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
  21static 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
  28void __init isa_timer_init(void)
  29{
  30        clocksource_i8253_init();
  31
  32        if (request_irq(i8253_clockevent.irq, pit_timer_interrupt,
  33                        IRQF_TIMER | IRQF_IRQPOLL, "pit", &i8253_clockevent))
  34                pr_err("Failed to request irq %d(pit)\n", i8253_clockevent.irq);
  35        clockevent_i8253_init(false);
  36}
  37