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 */
null_rtc_get_time(struct timespec * tv)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
null_rtc_set_time(const time_t secs)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
read_persistent_clock(struct timespec * ts)41 void read_persistent_clock(struct timespec *ts)
42 {
43 rtc_sh_get_time(ts);
44 }
45
46 #ifdef CONFIG_GENERIC_CMOS_UPDATE
update_persistent_clock(struct timespec now)47 int update_persistent_clock(struct timespec now)
48 {
49 return rtc_sh_set_time(now.tv_sec);
50 }
51 #endif
52
get_rtc_time(struct rtc_time * tm)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
set_rtc_time(struct rtc_time * tm)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
rtc_generic_init(void)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
sh_late_time_init(void)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
time_init(void)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 }
114