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Linux/arch/mips/kernel/i8253.c

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  1 /*
  2  * i8253.c  8253/PIT functions
  3  *
  4  */
  5 #include <linux/clockchips.h>
  6 #include <linux/i8253.h>
  7 #include <linux/export.h>
  8 #include <linux/smp.h>
  9 #include <linux/irq.h>
 10 
 11 #include <asm/time.h>
 12 
 13 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 14 {
 15         i8253_clockevent.event_handler(&i8253_clockevent);
 16 
 17         return IRQ_HANDLED;
 18 }
 19 
 20 static struct irqaction irq0  = {
 21         .handler = timer_interrupt,
 22         .flags = IRQF_NOBALANCING | IRQF_TIMER,
 23         .name = "timer"
 24 };
 25 
 26 void __init setup_pit_timer(void)
 27 {
 28         clockevent_i8253_init(true);
 29         setup_irq(0, &irq0);
 30 }
 31 
 32 static int __init init_pit_clocksource(void)
 33 {
 34         if (num_possible_cpus() > 1) /* PIT does not scale! */
 35                 return 0;
 36 
 37         return clocksource_i8253_init();
 38 }
 39 arch_initcall(init_pit_clocksource);
 40 

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