release/src-rt-6.x.4708/linux/linux-2.6.36/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/hwblk.h>
  25 #include <asm/rtc.h>
  26
  27 /* Dummy RTC ops */
  28 static void null_rtc_get_time(struct timespec *tv)
  29 {
  30         tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0);
  31         tv->tv_nsec = 0;
  32 }
  33
  34 static int null_rtc_set_time(const time_t secs)
  35 {
  36         return 0;
  37 }
  38
  39 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
  40 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
  41
  42 void read_persistent_clock(struct timespec *ts)
  43 {
  44         rtc_sh_get_time(ts);
  45 }
  46
  47 #ifdef CONFIG_GENERIC_CMOS_UPDATE
  48 int update_persistent_clock(struct timespec now)
  49 {
  50         return rtc_sh_set_time(now.tv_sec);
  51 }
  52 #endif
  53
  54 unsigned int get_rtc_time(struct rtc_time *tm)
  55 {
  56         if (rtc_sh_get_time != null_rtc_get_time) {
  57                 struct timespec tv;
  58
  59                 rtc_sh_get_time(&tv);
  60                 rtc_time_to_tm(tv.tv_sec, tm);
  61         }
  62
  63         return RTC_24H;
  64 }
  65 EXPORT_SYMBOL(get_rtc_time);
  66
  67 int set_rtc_time(struct rtc_time *tm)
  68 {
  69         unsigned long secs;
  70
  71         rtc_tm_to_time(tm, &secs);
  72         return rtc_sh_set_time(secs);
  73 }
  74 EXPORT_SYMBOL(set_rtc_time);
  75
  76 static int __init rtc_generic_init(void)
  77 {
  78         struct platform_device *pdev;
  79
  80         if (rtc_sh_get_time == null_rtc_get_time)
  81                 return -ENODEV;
  82
  83         pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
  84         if (IS_ERR(pdev))
  85                 return PTR_ERR(pdev);
  86
  87         return 0;
  88 }
  89 module_init(rtc_generic_init);
  90
  91 void (*board_time_init)(void);
  92
  93 static void __init sh_late_time_init(void)
  94 {
  95         /*
  96          * Make sure all compiled-in early timers register themselves.
  97          *
  98          * Run probe() for two "earlytimer" devices, these will be the
  99          * clockevents and clocksource devices respectively. In the event
 100          * that only a clockevents device is available, we -ENODEV on the
 101          * clocksource and the jiffies clocksource is used transparently
 102          * instead. No error handling is necessary here.
 103          */
 104         early_platform_driver_register_all("earlytimer");
 105         early_platform_driver_probe("earlytimer", 2, 0);
 106 }
 107
 108 void __init time_init(void)
 109 {
 110         if (board_time_init)
 111                 board_time_init();
 112
 113         hwblk_init();
 114         clk_init();
 115
 116         late_time_init = sh_late_time_init;
 117 }