1 /*
2  *  linux/drivers/clocksource/dummy_timer.c
3  *
4  *  Copyright (C) 2013 ARM Ltd.
5  *  All Rights Reserved
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 #include <linux/clockchips.h>
12 #include <linux/cpu.h>
13 #include <linux/init.h>
14 #include <linux/percpu.h>
15 #include <linux/cpumask.h>
16 
17 static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt);
18 
19 static int dummy_timer_starting_cpu(unsigned int cpu)
20 {
21 	struct clock_event_device *evt = per_cpu_ptr(&dummy_timer_evt, cpu);
22 
23 	evt->name	= "dummy_timer";
24 	evt->features	= CLOCK_EVT_FEAT_PERIODIC |
25 			  CLOCK_EVT_FEAT_ONESHOT |
26 			  CLOCK_EVT_FEAT_DUMMY;
27 	evt->rating	= 100;
28 	evt->cpumask	= cpumask_of(cpu);
29 
30 	clockevents_register_device(evt);
31 	return 0;
32 }
33 
34 static int __init dummy_timer_register(void)
35 {
36 	return cpuhp_setup_state(CPUHP_AP_DUMMY_TIMER_STARTING,
37 				 "AP_DUMMY_TIMER_STARTING",
38 				 dummy_timer_starting_cpu, NULL);
39 }
40 early_initcall(dummy_timer_register);
41