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
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