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 void __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