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Linux/arch/mips/kernel/i8253.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * i8253.c  8253/PIT functions
  4  *
  5  */
  6 #include <linux/clockchips.h>
  7 #include <linux/i8253.h>
  8 #include <linux/export.h>
  9 #include <linux/smp.h>
 10 #include <linux/irq.h>
 11 
 12 #include <asm/time.h>
 13 
 14 static irqreturn_t timer_interrupt(int irq, void *dev_id)
 15 {
 16         i8253_clockevent.event_handler(&i8253_clockevent);
 17 
 18         return IRQ_HANDLED;
 19 }
 20 
 21 static struct irqaction irq0  = {
 22         .handler = timer_interrupt,
 23         .flags = IRQF_NOBALANCING | IRQF_TIMER,
 24         .name = "timer"
 25 };
 26 
 27 void __init setup_pit_timer(void)
 28 {
 29         clockevent_i8253_init(true);
 30         setup_irq(0, &irq0);
 31 }
 32 
 33 static int __init init_pit_clocksource(void)
 34 {
 35         if (num_possible_cpus() > 1 || /* PIT does not scale! */
 36             !clockevent_state_periodic(&i8253_clockevent))
 37                 return 0;
 38 
 39         return clocksource_i8253_init();
 40 }
 41 arch_initcall(init_pit_clocksource);
 42 

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