drivers/clocksource/dummy_timer.c

   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);