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 "clockevents/dummy_timer:starting", 38 dummy_timer_starting_cpu, NULL); 39 } 40 early_initcall(dummy_timer_register); 41