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
  28static 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
  35void __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}
  42