arch/sh/kernel/time.c

   1 /*
   2  *  arch/sh/kernel/time.c
   3  *
   4  *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
   5  *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
   6  *  Copyright (C) 2002 - 2009  Paul Mundt
   7  *  Copyright (C) 2002  M. R. Brown  <mrbrown@linux-sh.org>
   8  *
   9  * This file is subject to the terms and conditions of the GNU General Public
  10  * License.  See the file "COPYING" in the main directory of this archive
  11  * for more details.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/profile.h>
  17 #include <linux/timex.h>
  18 #include <linux/sched.h>
  19 #include <linux/clockchips.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/smp.h>
  22 #include <linux/rtc.h>
  23 #include <asm/clock.h>
  24 #include <asm/rtc.h>
  25
  26 /* Dummy RTC ops */
  27 static void null_rtc_get_time(struct timespec *tv)
  28 {
  29         tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0);
  30         tv->tv_nsec = 0;
  31 }
  32
  33 static int null_rtc_set_time(const time_t secs)
  34 {
  35         return 0;
  36 }
  37
  38 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
  39 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
  40
  41 #ifdef CONFIG_GENERIC_CMOS_UPDATE
  42 unsigned long read_persistent_clock(void)
  43 {
  44         struct timespec tv;
  45         rtc_sh_get_time(&tv);
  46         return tv.tv_sec;
  47 }
  48
  49 int update_persistent_clock(struct timespec now)
  50 {
  51         return rtc_sh_set_time(now.tv_sec);
  52 }
  53 #endif
  54
  55 unsigned int get_rtc_time(struct rtc_time *tm)
  56 {
  57         if (rtc_sh_get_time != null_rtc_get_time) {
  58                 struct timespec tv;
  59
  60                 rtc_sh_get_time(&tv);
  61                 rtc_time_to_tm(tv.tv_sec, tm);
  62         }
  63
  64         return RTC_24H;
  65 }
  66 EXPORT_SYMBOL(get_rtc_time);
  67
  68 int set_rtc_time(struct rtc_time *tm)
  69 {
  70         unsigned long secs;
  71
  72         rtc_tm_to_time(tm, &secs);
  73         return rtc_sh_set_time(secs);
  74 }
  75 EXPORT_SYMBOL(set_rtc_time);
  76
  77 static int __init rtc_generic_init(void)
  78 {
  79         struct platform_device *pdev;
  80
  81         if (rtc_sh_get_time == null_rtc_get_time)
  82                 return -ENODEV;
  83
  84         pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
  85         if (IS_ERR(pdev))
  86                 return PTR_ERR(pdev);
  87
  88         return 0;
  89 }
  90 module_init(rtc_generic_init);
  91
  92 void (*board_time_init)(void);
  93
  94 unsigned long long sched_clock(void)
  95 {
  96         return (jiffies_64 - INITIAL_JIFFIES) * (NSEC_PER_SEC / HZ);
  97 }
  98
  99 static void __init sh_late_time_init(void)
 100 {
 101         /*
 102          * Make sure all compiled-in early timers register themselves.
 103          * Run probe() for one "earlytimer" device.
 104          */
 105         early_platform_driver_register_all("earlytimer");
 106         early_platform_driver_probe("earlytimer", 1, 0);
 107 }
 108
 109 void __init time_init(void)
 110 {
 111         if (board_time_init)
 112                 board_time_init();
 113
 114         clk_init();
 115
 116         rtc_sh_get_time(&xtime);
 117         set_normalized_timespec(&wall_to_monotonic,
 118                                 -xtime.tv_sec, -xtime.tv_nsec);
 119
 120 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 121         local_timer_setup(smp_processor_id());
 122 #endif
 123
 124         late_time_init = sh_late_time_init;
 125 }