67 строки
1.5 KiB
C
67 строки
1.5 KiB
C
/*
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* Dummy local timer
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*
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* Copyright (C) 2008 Paul Mundt
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*
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* cloned from:
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*
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* linux/arch/arm/mach-realview/localtimer.c
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*
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* Copyright (C) 2002 ARM Ltd.
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/smp.h>
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#include <linux/jiffies.h>
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#include <linux/percpu.h>
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#include <linux/clockchips.h>
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#include <linux/hardirq.h>
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#include <linux/irq.h>
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static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
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/*
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* Used on SMP for either the local timer or SMP_MSG_TIMER
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*/
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void local_timer_interrupt(void)
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{
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struct clock_event_device *clk = this_cpu_ptr(&local_clockevent);
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irq_enter();
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clk->event_handler(clk);
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irq_exit();
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}
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static void dummy_timer_set_mode(enum clock_event_mode mode,
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struct clock_event_device *clk)
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{
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}
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void local_timer_setup(unsigned int cpu)
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{
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struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
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clk->name = "dummy_timer";
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clk->features = CLOCK_EVT_FEAT_ONESHOT |
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CLOCK_EVT_FEAT_PERIODIC |
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CLOCK_EVT_FEAT_DUMMY;
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clk->rating = 400;
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clk->mult = 1;
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clk->set_mode = dummy_timer_set_mode;
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clk->broadcast = smp_timer_broadcast;
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clk->cpumask = cpumask_of(cpu);
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clockevents_register_device(clk);
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}
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void local_timer_stop(unsigned int cpu)
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{
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}
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