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 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 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