Linux Kernel  3.7.1
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time.c
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1 /*
2  * arch/sh/kernel/time.c
3  *
4  * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
5  * Copyright (C) 2000 Philipp Rumpf <[email protected]>
6  * Copyright (C) 2002 - 2009 Paul Mundt
7  * Copyright (C) 2002 M. R. Brown <[email protected]>
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 
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 }
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 }
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  if (IS_ERR(pdev))
84  return PTR_ERR(pdev);
85 
86  return 0;
87 }
88 module_init(rtc_generic_init);
89 
91 
92 static void __init sh_late_time_init(void)
93 {
94  /*
95  * Make sure all compiled-in early timers register themselves.
96  *
97  * Run probe() for two "earlytimer" devices, these will be the
98  * clockevents and clocksource devices respectively. In the event
99  * that only a clockevents device is available, we -ENODEV on the
100  * clocksource and the jiffies clocksource is used transparently
101  * instead. No error handling is necessary here.
102  */
104  early_platform_driver_probe("earlytimer", 2, 0);
105 }
106 
107 void __init time_init(void)
108 {
109  if (board_time_init)
110  board_time_init();
111 
112  clk_init();
113 
114  late_time_init = sh_late_time_init;
115 }