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 };
45