time.c 1.5 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Based on arch/arm/kernel/time.c
  4. *
  5. * Copyright (C) 1991, 1992, 1995 Linus Torvalds
  6. * Modifications for ARM (C) 1994-2001 Russell King
  7. * Copyright (C) 2012 ARM Ltd.
  8. */
  9. #include <linux/clockchips.h>
  10. #include <linux/export.h>
  11. #include <linux/kernel.h>
  12. #include <linux/interrupt.h>
  13. #include <linux/time.h>
  14. #include <linux/init.h>
  15. #include <linux/sched.h>
  16. #include <linux/smp.h>
  17. #include <linux/timex.h>
  18. #include <linux/errno.h>
  19. #include <linux/profile.h>
  20. #include <linux/syscore_ops.h>
  21. #include <linux/timer.h>
  22. #include <linux/irq.h>
  23. #include <linux/delay.h>
  24. #include <linux/clocksource.h>
  25. #include <linux/of_clk.h>
  26. #include <linux/acpi.h>
  27. #include <clocksource/arm_arch_timer.h>
  28. #include <asm/thread_info.h>
  29. #include <asm/stacktrace.h>
  30. #include <asm/paravirt.h>
  31. unsigned long profile_pc(struct pt_regs *regs)
  32. {
  33. struct stackframe frame;
  34. if (!in_lock_functions(regs->pc))
  35. return regs->pc;
  36. start_backtrace(&frame, regs->regs[29], regs->pc);
  37. do {
  38. int ret = unwind_frame(NULL, &frame);
  39. if (ret < 0)
  40. return 0;
  41. } while (in_lock_functions(frame.pc));
  42. return frame.pc;
  43. }
  44. EXPORT_SYMBOL(profile_pc);
  45. void __init time_init(void)
  46. {
  47. u32 arch_timer_rate;
  48. of_clk_init(NULL);
  49. timer_probe();
  50. tick_setup_hrtimer_broadcast();
  51. arch_timer_rate = arch_timer_get_rate();
  52. if (!arch_timer_rate)
  53. panic("Unable to initialise architected timer.\n");
  54. /* Calibrate the delay loop directly */
  55. lpj_fine = arch_timer_rate / HZ;
  56. pv_time_init();
  57. }