2 * i8253.c 8253/PIT functions
5 #include <linux/clockchips.h>
6 #include <linux/i8253.h>
7 #include <linux/export.h>
13 static irqreturn_t timer_interrupt(int irq, void *dev_id)
15 i8253_clockevent.event_handler(&i8253_clockevent);
20 static struct irqaction irq0 = {
21 .handler = timer_interrupt,
22 .flags = IRQF_NOBALANCING | IRQF_TIMER,
26 void __init setup_pit_timer(void)
28 clockevent_i8253_init(true);
32 static int __init init_pit_clocksource(void)
34 if (num_possible_cpus() > 1 || /* PIT does not scale! */
35 !clockevent_state_periodic(&i8253_clockevent))
38 return clocksource_i8253_init();
40 arch_initcall(init_pit_clocksource);