arch_timer.c 926 B

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * linux/arch/arm/kernel/arch_timer.c
  4. *
  5. * Copyright (C) 2011 ARM Ltd.
  6. * All Rights Reserved
  7. */
  8. #include <linux/init.h>
  9. #include <linux/types.h>
  10. #include <linux/errno.h>
  11. #include <asm/delay.h>
  12. #include <asm/arch_timer.h>
  13. #include <clocksource/arm_arch_timer.h>
  14. static unsigned long arch_timer_read_counter_long(void)
  15. {
  16. return arch_timer_read_counter();
  17. }
  18. static struct delay_timer arch_delay_timer;
  19. static void __init arch_timer_delay_timer_register(void)
  20. {
  21. /* Use the architected timer for the delay loop. */
  22. arch_delay_timer.read_current_timer = arch_timer_read_counter_long;
  23. arch_delay_timer.freq = arch_timer_get_rate();
  24. register_current_timer_delay(&arch_delay_timer);
  25. }
  26. int __init arch_timer_arch_init(void)
  27. {
  28. u32 arch_timer_rate = arch_timer_get_rate();
  29. if (arch_timer_rate == 0)
  30. return -ENXIO;
  31. arch_timer_delay_timer_register();
  32. return 0;
  33. }