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/init.h>
  15 #include <linux/profile.h>
  16 #include <linux/timex.h>
  17 #include <linux/sched.h>
  18 #include <linux/clockchips.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/smp.h>
  21 #include <linux/rtc.h>
  22 #include <asm/clock.h>
  23 #include <asm/rtc.h>
  24
  25 /* Dummy RTC ops */
  26 static void null_rtc_get_time(struct timespec *tv)
  27 {
  28         tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0);
  29         tv->tv_nsec = 0;
  30 }
  31
  32 static int null_rtc_set_time(const time_t secs)
  33 {
  34         return 0;
  35 }
  36
  37 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
  38 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
  39
  40 void read_persistent_clock(struct timespec *ts)
  41 {
  42         rtc_sh_get_time(ts);
  43 }
  44
  45 #ifdef CONFIG_GENERIC_CMOS_UPDATE
  46 int update_persistent_clock(struct timespec now)
  47 {
  48         return rtc_sh_set_time(now.tv_sec);
  49 }
  50 #endif
  51
  52 static int rtc_generic_get_time(struct device *dev, struct rtc_time *tm)
  53 {
  54         struct timespec tv;
  55
  56         rtc_sh_get_time(&tv);
  57         rtc_time_to_tm(tv.tv_sec, tm);
  58         return 0;
  59 }
  60
  61 static int rtc_generic_set_time(struct device *dev, struct rtc_time *tm)
  62 {
  63         unsigned long secs;
  64
  65         rtc_tm_to_time(tm, &secs);
  66         if ((rtc_sh_set_time == null_rtc_set_time) ||
  67             (rtc_sh_set_time(secs) < 0))
  68                 return -EOPNOTSUPP;
  69
  70         return 0;
  71 }
  72
  73 static const struct rtc_class_ops rtc_generic_ops = {
  74         .read_time = rtc_generic_get_time,
  75         .set_time = rtc_generic_set_time,
  76 };
  77
  78 static int __init rtc_generic_init(void)
  79 {
  80         struct platform_device *pdev;
  81
  82         if (rtc_sh_get_time == null_rtc_get_time)
  83                 return -ENODEV;
  84
  85         pdev = platform_device_register_data(NULL, "rtc-generic", -1,
  86                                              &rtc_generic_ops,
  87                                              sizeof(rtc_generic_ops));
  88
  89
  90         return PTR_ERR_OR_ZERO(pdev);
  91 }
  92 device_initcall(rtc_generic_init);
  93
  94 void (*board_time_init)(void);
  95
  96 static void __init sh_late_time_init(void)
  97 {
  98         /*
  99          * Make sure all compiled-in early timers register themselves.
 100          *
 101          * Run probe() for two "earlytimer" devices, these will be the
 102          * clockevents and clocksource devices respectively. In the event
 103          * that only a clockevents device is available, we -ENODEV on the
 104          * clocksource and the jiffies clocksource is used transparently
 105          * instead. No error handling is necessary here.
 106          */
 107         early_platform_driver_register_all("earlytimer");
 108         early_platform_driver_probe("earlytimer", 2, 0);
 109 }
 110
 111 void __init time_init(void)
 112 {
 113         if (board_time_init)
 114                 board_time_init();
 115
 116         clk_init();
 117
 118         late_time_init = sh_late_time_init;
 119 }