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 */
27static 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
33static int null_rtc_set_time(const time_t secs)
34{
35	return 0;
36}
37
38void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
39int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
40
41void read_persistent_clock(struct timespec *ts)
42{
43	rtc_sh_get_time(ts);
44}
45
46#ifdef CONFIG_GENERIC_CMOS_UPDATE
47int update_persistent_clock(struct timespec now)
48{
49	return rtc_sh_set_time(now.tv_sec);
50}
51#endif
52
53unsigned 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}
64EXPORT_SYMBOL(get_rtc_time);
65
66int 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}
73EXPORT_SYMBOL(set_rtc_time);
74
75static 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}
86module_init(rtc_generic_init);
87
88void (*board_time_init)(void);
89
90static 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
105void __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