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 void read_persistent_clock(struct timespec *ts)
  42 {
  43         rtc_sh_get_time(ts);
  44 }
  45
  46 #ifdef CONFIG_GENERIC_CMOS_UPDATE
  47 int update_persistent_clock(struct timespec now)
  48 {
  49         return rtc_sh_set_time(now.tv_sec);
  50 }
  51 #endif
  52
  53 unsigned int get_rtc_time(struct rtc_time *tm)
  54 {
  55         if (rtc_sh_get_time != null_rtc_get_time) {
  56                 struct timespec tv;
  57
  58                 rtc_sh_get_time(&tv);
  59                 rtc_time_to_tm(tv.tv_sec, tm);
  60         }
  61
  62         return RTC_24H;
  63 }
  64 EXPORT_SYMBOL(get_rtc_time);
  65
  66 int set_rtc_time(struct rtc_time *tm)
  67 {
  68         unsigned long secs;
  69
  70         rtc_tm_to_time(tm, &secs);
  71         return rtc_sh_set_time(secs);
  72 }
  73 EXPORT_SYMBOL(set_rtc_time);
  74
  75 static int __init rtc_generic_init(void)
  76 {
  77         struct platform_device *pdev;
  78
  79         if (rtc_sh_get_time == null_rtc_get_time)
  80                 return -ENODEV;
  81
  82         pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
  83
  84         return PTR_ERR_OR_ZERO(pdev);
  85 }
  86 module_init(rtc_generic_init);
  87
  88 void (*board_time_init)(void);
  89
  90 static void __init sh_late_time_init(void)
  91 {
  92         /*
  93          * Make sure all compiled-in early timers register themselves.
  94          *
  95          * Run probe() for two "earlytimer" devices, these will be the
  96          * clockevents and clocksource devices respectively. In the event
  97          * that only a clockevents device is available, we -ENODEV on the
  98          * clocksource and the jiffies clocksource is used transparently
  99          * instead. No error handling is necessary here.
 100          */
 101         early_platform_driver_register_all("earlytimer");
 102         early_platform_driver_probe("earlytimer", 2, 0);
 103 }
 104
 105 void __init time_init(void)
 106 {
 107         if (board_time_init)
 108                 board_time_init();
 109
 110         clk_init();
 111
 112         late_time_init = sh_late_time_init;
 113 }