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 */
null_rtc_get_time(struct timespec * tv)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
null_rtc_set_time(const time_t secs)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
read_persistent_clock(struct timespec * ts)42 void read_persistent_clock(struct timespec *ts)
43 {
44 rtc_sh_get_time(ts);
45 }
46
47 #ifdef CONFIG_GENERIC_CMOS_UPDATE
update_persistent_clock(struct timespec now)48 int update_persistent_clock(struct timespec now)
49 {
50 return rtc_sh_set_time(now.tv_sec);
51 }
52 #endif
53
get_rtc_time(struct rtc_time * tm)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
set_rtc_time(struct rtc_time * tm)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
rtc_generic_init(void)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
sh_late_time_init(void)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
time_init(void)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 }
118