1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  linux/drivers/clocksource/dummy_timer.c
4  *
5  *  Copyright (C) 2013 ARM Ltd.
6  *  All Rights Reserved
7  */
8 #include <linux/clockchips.h>
9 #include <linux/cpu.h>
10 #include <linux/init.h>
11 #include <linux/percpu.h>
12 #include <linux/cpumask.h>
13 
14 static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt);
15 
dummy_timer_starting_cpu(unsigned int cpu)16 static int dummy_timer_starting_cpu(unsigned int cpu)
17 {
18 	struct clock_event_device *evt = per_cpu_ptr(&dummy_timer_evt, cpu);
19 
20 	evt->name	= "dummy_timer";
21 	evt->features	= CLOCK_EVT_FEAT_PERIODIC |
22 			  CLOCK_EVT_FEAT_ONESHOT |
23 			  CLOCK_EVT_FEAT_DUMMY;
24 	evt->rating	= 100;
25 	evt->cpumask	= cpumask_of(cpu);
26 
27 	clockevents_register_device(evt);
28 	return 0;
29 }
30 
dummy_timer_register(void)31 static int __init dummy_timer_register(void)
32 {
33 	return cpuhp_setup_state(CPUHP_AP_DUMMY_TIMER_STARTING,
34 				 "clockevents/dummy_timer:starting",
35 				 dummy_timer_starting_cpu, NULL);
36 }
37 early_initcall(dummy_timer_register);
38