arch/cris/kernel/time.c

   1 /*
   2  *  linux/arch/cris/kernel/time.c
   3  *
   4  *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
   5  *  Copyright (C) 1999, 2000, 2001 Axis Communications AB
   6  *
   7  * 1994-07-02    Alan Modra
   8  *      fixed set_rtc_mmss, fixed time.year for >= 2000, new mktime
   9  * 1995-03-26    Markus Kuhn
  10  *      fixed 500 ms bug at call to set_rtc_mmss, fixed DS12887
  11  *      precision CMOS clock update
  12  * 1996-05-03    Ingo Molnar
  13  *      fixed time warps in do_[slow|fast]_gettimeoffset()
  14  * 1997-09-10   Updated NTP code according to technical memorandum Jan '96
  15  *              "A Kernel Model for Precision Timekeeping" by Dave Mills
  16  *
  17  * Linux/CRIS specific code:
  18  *
  19  * Authors:    Bjorn Wesen
  20  *             Johan Adolfsson
  21  *
  22  */
  23
  24 #include <linux/errno.h>
  25 #include <linux/module.h>
  26 #include <linux/param.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/bcd.h>
  29 #include <linux/timex.h>
  30 #include <linux/init.h>
  31 #include <linux/profile.h>
  32 #include <linux/sched.h>        /* just for sched_clock() - funny that */
  33
  34
  35 #define D(x)
  36
  37 #define TICK_SIZE tick
  38
  39 extern unsigned long loops_per_jiffy; /* init/main.c */
  40 unsigned long loops_per_usec;
  41
  42
  43 #ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
  44 extern unsigned long do_slow_gettimeoffset(void);
  45 static unsigned long (*do_gettimeoffset)(void) = do_slow_gettimeoffset;
  46
  47 u32 arch_gettimeoffset(void)
  48 {
  49        return do_gettimeoffset() * 1000;
  50 }
  51 #endif
  52
  53 int set_rtc_mmss(unsigned long nowtime)
  54 {
  55         D(printk(KERN_DEBUG "set_rtc_mmss(%lu)\n", nowtime));
  56         return 0;
  57 }
  58
  59 /* grab the time from the RTC chip */
  60 unsigned long get_cmos_time(void)
  61 {
  62         return 0;
  63 }
  64
  65
  66 int update_persistent_clock(struct timespec now)
  67 {
  68         return set_rtc_mmss(now.tv_sec);
  69 }
  70
  71 void read_persistent_clock(struct timespec *ts)
  72 {
  73         ts->tv_sec = 0;
  74         ts->tv_nsec = 0;
  75 }
  76
  77
  78 extern void cris_profile_sample(struct pt_regs* regs);
  79
  80 void
  81 cris_do_profile(struct pt_regs* regs)
  82 {
  83
  84 #ifdef CONFIG_SYSTEM_PROFILER
  85         cris_profile_sample(regs);
  86 #endif
  87
  88 #ifdef CONFIG_PROFILING
  89         profile_tick(CPU_PROFILING);
  90 #endif
  91 }
  92
  93 unsigned long long sched_clock(void)
  94 {
  95         return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ) +
  96                 get_ns_in_jiffie();
  97 }
  98
  99 static int
 100 __init init_udelay(void)
 101 {
 102         loops_per_usec = (loops_per_jiffy * HZ) / 1000000;
 103         return 0;
 104 }
 105
 106 __initcall(init_udelay);