Linux 5.5-rc4
[sfrench/cifs-2.6.git] / 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
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 static 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
35 void __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 }