arch/cris/kernel/time.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/cris/kernel/time.c
   4  *
   5  *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
   6  *  Copyright (C) 1999, 2000, 2001 Axis Communications AB
   7  *
   8  * 1994-07-02    Alan Modra
   9  *      fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
  10  * 1995-03-26    Markus Kuhn
  11  *      fixed 500 ms bug at call to set_rtc_mmss, fixed DS12887
  12  *      precision CMOS clock update
  13  * 1996-05-03    Ingo Molnar
  14  *      fixed time warps in do_[slow|fast]_gettimeoffset()
  15  * 1997-09-10   Updated NTP code according to technical memorandum Jan '96
  16  *              "A Kernel Model for Precision Timekeeping" by Dave Mills
  17  *
  18  * Linux/CRIS specific code:
  19  *
  20  * Authors:    Bjorn Wesen
  21  *             Johan Adolfsson
  22  *
  23  */
  24
  25 #include <linux/errno.h>
  26 #include <linux/module.h>
  27 #include <linux/param.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/bcd.h>
  30 #include <linux/timex.h>
  31 #include <linux/init.h>
  32 #include <linux/profile.h>
  33 #include <linux/sched/clock.h>
  34
  35
  36 #define D(x)
  37
  38 #define TICK_SIZE tick
  39
  40 extern unsigned long loops_per_jiffy; /* init/main.c */
  41 unsigned long loops_per_usec;
  42
  43 extern void cris_profile_sample(struct pt_regs* regs);
  44
  45 void
  46 cris_do_profile(struct pt_regs* regs)
  47 {
  48
  49 #ifdef CONFIG_SYSTEM_PROFILER
  50         cris_profile_sample(regs);
  51 #endif
  52
  53 #ifdef CONFIG_PROFILING
  54         profile_tick(CPU_PROFILING);
  55 #endif
  56 }
  57
  58 #ifndef CONFIG_GENERIC_SCHED_CLOCK
  59 unsigned long long sched_clock(void)
  60 {
  61         return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ) +
  62                 get_ns_in_jiffie();
  63 }
  64 #endif
  65
  66 static int
  67 __init init_udelay(void)
  68 {
  69         loops_per_usec = (loops_per_jiffy * HZ) / 1000000;
  70         return 0;
  71 }
  72
  73 __initcall(init_udelay);