arch/m68k/kernel/time_no.c

   1 /*
   2  *  linux/arch/m68knommu/kernel/time.c
   3  *
   4  *  Copyright (C) 1991, 1992, 1995  Linus Torvalds
   5  *
   6  * This file contains the m68k-specific time handling details.
   7  * Most of the stuff is located in the machine specific files.
   8  *
   9  * 1997-09-10   Updated NTP code according to technical memorandum Jan '96
  10  *              "A Kernel Model for Precision Timekeeping" by Dave Mills
  11  */
  12
  13 #include <linux/errno.h>
  14 #include <linux/module.h>
  15 #include <linux/sched.h>
  16 #include <linux/kernel.h>
  17 #include <linux/param.h>
  18 #include <linux/string.h>
  19 #include <linux/mm.h>
  20 #include <linux/profile.h>
  21 #include <linux/time.h>
  22 #include <linux/timex.h>
  23
  24 #include <asm/machdep.h>
  25 #include <asm/irq_regs.h>
  26
  27 #define TICK_SIZE (tick_nsec / 1000)
  28
  29 /* machine dependent timer functions */
  30 void (*mach_gettod)(int*, int*, int*, int*, int*, int*);
  31
  32 static inline int set_rtc_mmss(unsigned long nowtime)
  33 {
  34         if (mach_set_clock_mmss)
  35                 return mach_set_clock_mmss (nowtime);
  36         return -1;
  37 }
  38
  39 #ifndef CONFIG_GENERIC_CLOCKEVENTS
  40 /*
  41  * timer_interrupt() needs to keep up the real-time clock,
  42  * as well as call the "xtime_update()" routine every clocktick
  43  */
  44 irqreturn_t arch_timer_interrupt(int irq, void *dummy)
  45 {
  46
  47         if (current->pid)
  48                 profile_tick(CPU_PROFILING);
  49
  50         xtime_update(1);
  51
  52         update_process_times(user_mode(get_irq_regs()));
  53
  54         return(IRQ_HANDLED);
  55 }
  56 #endif
  57
  58 static unsigned long read_rtc_mmss(void)
  59 {
  60         unsigned int year, mon, day, hour, min, sec;
  61
  62         if (mach_gettod) {
  63                 mach_gettod(&year, &mon, &day, &hour, &min, &sec);
  64                 if ((year += 1900) < 1970)
  65                         year += 100;
  66         } else {
  67                 year = 1970;
  68                 mon = day = 1;
  69                 hour = min = sec = 0;
  70         }
  71
  72
  73         return  mktime(year, mon, day, hour, min, sec);
  74 }
  75
  76 void read_persistent_clock(struct timespec *ts)
  77 {
  78         ts->tv_sec = read_rtc_mmss();
  79         ts->tv_nsec = 0;
  80 }
  81
  82 int update_persistent_clock(struct timespec now)
  83 {
  84         return set_rtc_mmss(now.tv_sec);
  85 }
  86
  87 void time_init(void)
  88 {
  89         hw_timer_init();
  90 }