dummy_timer.c 931 B

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  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. static DEFINE_PER_CPU(struct clock_event_device, dummy_timer_evt);
  14. static int dummy_timer_starting_cpu(unsigned int cpu)
  15. {
  16. struct clock_event_device *evt = per_cpu_ptr(&dummy_timer_evt, cpu);
  17. evt->name = "dummy_timer";
  18. evt->features = CLOCK_EVT_FEAT_PERIODIC |
  19. CLOCK_EVT_FEAT_ONESHOT |
  20. CLOCK_EVT_FEAT_DUMMY;
  21. evt->rating = 100;
  22. evt->cpumask = cpumask_of(cpu);
  23. clockevents_register_device(evt);
  24. return 0;
  25. }
  26. static int __init dummy_timer_register(void)
  27. {
  28. return cpuhp_setup_state(CPUHP_AP_DUMMY_TIMER_STARTING,
  29. "clockevents/dummy_timer:starting",
  30. dummy_timer_starting_cpu, NULL);
  31. }
  32. early_initcall(dummy_timer_register);