[linux.git] / arch / mips / kernel / i8253.c

/*
 * i8253.c  8253/PIT functions
 *
 */
#include <linux/clockchips.h>
#include <linux/i8253.h>
#include <linux/export.h>
#include <linux/smp.h>
#include <linux/irq.h>

#include <asm/time.h>

static irqreturn_t timer_interrupt(int irq, void *dev_id)
{
	i8253_clockevent.event_handler(&i8253_clockevent);

	return IRQ_HANDLED;
}

static struct irqaction irq0  = {
	.handler = timer_interrupt,
	.flags = IRQF_NOBALANCING | IRQF_TIMER,
	.name = "timer"
};

void __init setup_pit_timer(void)
{
	clockevent_i8253_init(true);
	setup_irq(0, &irq0);
}

static int __init init_pit_clocksource(void)
{
	if (num_possible_cpus() > 1) /* PIT does not scale! */
		return 0;

	return clocksource_i8253_init();
}
arch_initcall(init_pit_clocksource);
Commit	Line	Data
d865bea4 RB	1	/*
	2	* i8253.c 8253/PIT functions
	3	*
	4	*/
	5	#include <linux/clockchips.h>
334955ef	6	#include <linux/i8253.h>
73bc256d	7	#include <linux/export.h>
631330f5	8	#include <linux/smp.h>
ca4d3e67	9	#include <linux/irq.h>
d865bea4	10
dd3db6eb	11	#include <asm/time.h>
d865bea4	12
dd3db6eb	13	static irqreturn_t timer_interrupt(int irq, void *dev_id)
d865bea4	14	{
ded7c1ee	15	i8253_clockevent.event_handler(&i8253_clockevent);
d865bea4 RB	16
	17	return IRQ_HANDLED;
	18	}
	19
	20	static struct irqaction irq0 = {
	21	.handler = timer_interrupt,
8b5690f8	22	.flags = IRQF_NOBALANCING \| IRQF_TIMER,
d865bea4 RB	23	.name = "timer"
	24	};
	25
d865bea4 RB	26	void __init setup_pit_timer(void)
d865bea4 RB	27	{
2d02612f	28	clockevent_i8253_init(true);
d865bea4 RB	29	setup_irq(0, &irq0);
	30	}
	31
d865bea4 RB	32	static int __init init_pit_clocksource(void)
	33	{
	34	if (num_possible_cpus() > 1) /* PIT does not scale! */
	35	return 0;
	36
798778b8	37	return clocksource_i8253_init();
d865bea4 RB	38	}
d865bea4 RB	39	arch_initcall(init_pit_clocksource);