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38 lines
839 B
38 lines
839 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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/export.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(&i8253_clockevent); |
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return IRQ_HANDLED; |
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} |
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void __init setup_pit_timer(void) |
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{ |
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unsigned long flags = IRQF_NOBALANCING | IRQF_TIMER; |
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clockevent_i8253_init(true); |
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if (request_irq(0, timer_interrupt, flags, "timer", NULL)) |
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pr_err("Failed to request irq 0 (timer)\n"); |
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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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!clockevent_state_periodic(&i8253_clockevent)) |
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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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