xref: /OK3568_Linux_fs/kernel/arch/arm/mach-footbridge/isa-timer.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  *  linux/arch/arm/mach-footbridge/isa-timer.c
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  *  Copyright (C) 1998 Russell King.
6*4882a593Smuzhiyun  *  Copyright (C) 1998 Phil Blundell
7*4882a593Smuzhiyun  */
8*4882a593Smuzhiyun #include <linux/clockchips.h>
9*4882a593Smuzhiyun #include <linux/i8253.h>
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/interrupt.h>
12*4882a593Smuzhiyun #include <linux/irq.h>
13*4882a593Smuzhiyun #include <linux/spinlock.h>
14*4882a593Smuzhiyun #include <linux/timex.h>
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun #include <asm/irq.h>
17*4882a593Smuzhiyun #include <asm/mach/time.h>
18*4882a593Smuzhiyun 
19*4882a593Smuzhiyun #include "common.h"
20*4882a593Smuzhiyun 
pit_timer_interrupt(int irq,void * dev_id)21*4882a593Smuzhiyun static irqreturn_t pit_timer_interrupt(int irq, void *dev_id)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun 	struct clock_event_device *ce = dev_id;
24*4882a593Smuzhiyun 	ce->event_handler(ce);
25*4882a593Smuzhiyun 	return IRQ_HANDLED;
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun 
isa_timer_init(void)28*4882a593Smuzhiyun void __init isa_timer_init(void)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun 	clocksource_i8253_init();
31*4882a593Smuzhiyun 
32*4882a593Smuzhiyun 	if (request_irq(i8253_clockevent.irq, pit_timer_interrupt,
33*4882a593Smuzhiyun 			IRQF_TIMER | IRQF_IRQPOLL, "pit", &i8253_clockevent))
34*4882a593Smuzhiyun 		pr_err("Failed to request irq %d(pit)\n", i8253_clockevent.irq);
35*4882a593Smuzhiyun 	clockevent_i8253_init(false);
36*4882a593Smuzhiyun }
37