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https://github.com/torvalds/linux
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2d02612f61
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Russell King <linux@arm.linux.org.uk> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: John Stultz <john.stultz@linaro.org> Link: http://lkml.kernel.org/r/20110609130622.133068765@linutronix.de
40 lines
748 B
C
40 lines
748 B
C
/*
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* i8253.c 8253/PIT functions
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*
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*/
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#include <linux/clockchips.h>
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#include <linux/i8253.h>
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#include <linux/module.h>
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#include <linux/smp.h>
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#include <linux/irq.h>
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#include <asm/time.h>
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static irqreturn_t timer_interrupt(int irq, void *dev_id)
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{
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i8253_clockevent.event_handler(&pit_clockevent);
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return IRQ_HANDLED;
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}
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static struct irqaction irq0 = {
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.handler = timer_interrupt,
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.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER,
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.name = "timer"
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};
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void __init setup_pit_timer(void)
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{
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clockevent_i8253_init(true);
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setup_irq(0, &irq0);
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}
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static int __init init_pit_clocksource(void)
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{
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if (num_possible_cpus() > 1) /* PIT does not scale! */
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return 0;
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return clocksource_i8253_init();
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}
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arch_initcall(init_pit_clocksource);
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