You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
64 lines
1.5 KiB
64 lines
1.5 KiB
/* |
|
* linux/drivers/clocksource/dummy_timer.c |
|
* |
|
* Copyright (C) 2013 ARM Ltd. |
|
* All Rights Reserved |
|
* |
|
* This program is free software; you can redistribute it and/or modify |
|
* it under the terms of the GNU General Public License version 2 as |
|
* published by the Free Software Foundation. |
|
*/ |
|
#include <linux/clockchips.h> |
|
#include <linux/cpu.h> |
|
#include <linux/init.h> |
|
#include <linux/percpu.h> |
|
#include <linux/cpumask.h> |
|
|
|
static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt); |
|
|
|
static void dummy_timer_setup(void) |
|
{ |
|
int cpu = smp_processor_id(); |
|
struct clock_event_device *evt = raw_cpu_ptr(&dummy_timer_evt); |
|
|
|
evt->name = "dummy_timer"; |
|
evt->features = CLOCK_EVT_FEAT_PERIODIC | |
|
CLOCK_EVT_FEAT_ONESHOT | |
|
CLOCK_EVT_FEAT_DUMMY; |
|
evt->rating = 100; |
|
evt->cpumask = cpumask_of(cpu); |
|
|
|
clockevents_register_device(evt); |
|
} |
|
|
|
static int dummy_timer_cpu_notify(struct notifier_block *self, |
|
unsigned long action, void *hcpu) |
|
{ |
|
if ((action & ~CPU_TASKS_FROZEN) == CPU_STARTING) |
|
dummy_timer_setup(); |
|
|
|
return NOTIFY_OK; |
|
} |
|
|
|
static struct notifier_block dummy_timer_cpu_nb = { |
|
.notifier_call = dummy_timer_cpu_notify, |
|
}; |
|
|
|
static int __init dummy_timer_register(void) |
|
{ |
|
int err = 0; |
|
|
|
cpu_notifier_register_begin(); |
|
err = __register_cpu_notifier(&dummy_timer_cpu_nb); |
|
if (err) |
|
goto out; |
|
|
|
/* We won't get a call on the boot CPU, so register immediately */ |
|
if (num_possible_cpus() > 1) |
|
dummy_timer_setup(); |
|
|
|
out: |
|
cpu_notifier_register_done(); |
|
return err; |
|
} |
|
early_initcall(dummy_timer_register);
|
|
|