Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
8c24594d | 2 | * arch/sh/kernel/time_32.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka | |
5 | * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> | |
42786006 | 6 | * Copyright (C) 2002 - 2009 Paul Mundt |
1da177e4 LT |
7 | * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org> |
8 | * | |
9 | * Some code taken from i386 version. | |
10 | * Copyright (C) 1991, 1992, 1995 Linus Torvalds | |
11 | */ | |
1da177e4 | 12 | #include <linux/kernel.h> |
36ddf31b | 13 | #include <linux/module.h> |
1da177e4 | 14 | #include <linux/init.h> |
1da177e4 | 15 | #include <linux/profile.h> |
65e5d90d PM |
16 | #include <linux/timex.h> |
17 | #include <linux/sched.h> | |
57be2b48 | 18 | #include <linux/clockchips.h> |
fa43972f | 19 | #include <linux/mc146818rtc.h> /* for rtc_lock */ |
eaab8919 | 20 | #include <linux/platform_device.h> |
8c24594d | 21 | #include <linux/smp.h> |
47c8a08b | 22 | #include <linux/rtc.h> |
36ddf31b | 23 | #include <asm/clock.h> |
1da177e4 | 24 | #include <asm/rtc.h> |
36ddf31b | 25 | #include <asm/timer.h> |
1da177e4 | 26 | #include <asm/kgdb.h> |
1da177e4 | 27 | |
36ddf31b PM |
28 | struct sys_timer *sys_timer; |
29 | ||
30 | /* Move this somewhere more sensible.. */ | |
31 | DEFINE_SPINLOCK(rtc_lock); | |
32 | EXPORT_SYMBOL(rtc_lock); | |
1da177e4 | 33 | |
91550f71 PM |
34 | /* Dummy RTC ops */ |
35 | static void null_rtc_get_time(struct timespec *tv) | |
36 | { | |
37 | tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0); | |
38 | tv->tv_nsec = 0; | |
39 | } | |
40 | ||
41 | static int null_rtc_set_time(const time_t secs) | |
42 | { | |
43 | return 0; | |
44 | } | |
45 | ||
46 | void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time; | |
47 | int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time; | |
6d134b9e PM |
48 | |
49 | #ifdef CONFIG_GENERIC_CMOS_UPDATE | |
50 | unsigned long read_persistent_clock(void) | |
51 | { | |
52 | struct timespec tv; | |
53 | rtc_sh_get_time(&tv); | |
54 | return tv.tv_sec; | |
55 | } | |
56 | ||
57 | int update_persistent_clock(struct timespec now) | |
58 | { | |
59 | return rtc_sh_set_time(now.tv_sec); | |
60 | } | |
61 | #endif | |
1da177e4 | 62 | |
47c8a08b PM |
63 | unsigned int get_rtc_time(struct rtc_time *tm) |
64 | { | |
65 | if (rtc_sh_get_time != null_rtc_get_time) { | |
66 | struct timespec tv; | |
67 | ||
68 | rtc_sh_get_time(&tv); | |
69 | rtc_time_to_tm(tv.tv_sec, tm); | |
70 | } | |
71 | ||
72 | return RTC_24H; | |
73 | } | |
74 | EXPORT_SYMBOL(get_rtc_time); | |
75 | ||
76 | int set_rtc_time(struct rtc_time *tm) | |
77 | { | |
78 | unsigned long secs; | |
79 | ||
80 | rtc_tm_to_time(tm, &secs); | |
81 | return rtc_sh_set_time(secs); | |
82 | } | |
83 | EXPORT_SYMBOL(set_rtc_time); | |
84 | ||
42786006 PM |
85 | static int __init rtc_generic_init(void) |
86 | { | |
87 | struct platform_device *pdev; | |
88 | ||
89 | if (rtc_sh_get_time == null_rtc_get_time) | |
90 | return -ENODEV; | |
91 | ||
92 | pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0); | |
93 | if (IS_ERR(pdev)) | |
94 | return PTR_ERR(pdev); | |
95 | ||
96 | return 0; | |
97 | } | |
98 | module_init(rtc_generic_init); | |
99 | ||
1da177e4 LT |
100 | /* last time the RTC clock got updated */ |
101 | static long last_rtc_update; | |
102 | ||
103 | /* | |
36ddf31b | 104 | * handle_timer_tick() needs to keep up the real-time clock, |
1da177e4 LT |
105 | * as well as call the "do_timer()" routine every clocktick |
106 | */ | |
35f3c518 | 107 | void handle_timer_tick(void) |
1da177e4 | 108 | { |
35f3c518 PM |
109 | if (current->pid) |
110 | profile_tick(CPU_PROFILING); | |
1da177e4 | 111 | |
960c65e8 PZ |
112 | /* |
113 | * Here we are in the timer irq handler. We just have irqs locally | |
114 | * disabled but we don't know if the timer_bh is running on the other | |
115 | * CPU. We need to avoid to SMP race with it. NOTE: we don' t need | |
116 | * the irq version of write_lock because as just said we have irq | |
117 | * locally disabled. -arca | |
118 | */ | |
119 | write_seqlock(&xtime_lock); | |
120 | do_timer(1); | |
121 | ||
1da177e4 LT |
122 | /* |
123 | * If we have an externally synchronized Linux clock, then update | |
124 | * RTC clock accordingly every ~11 minutes. Set_rtc_mmss() has to be | |
125 | * called as close as possible to 500 ms before the new second starts. | |
126 | */ | |
b149ee22 | 127 | if (ntp_synced() && |
1da177e4 LT |
128 | xtime.tv_sec > last_rtc_update + 660 && |
129 | (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && | |
130 | (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { | |
af514ca7 | 131 | if (rtc_sh_set_time(xtime.tv_sec) == 0) |
1da177e4 LT |
132 | last_rtc_update = xtime.tv_sec; |
133 | else | |
36ddf31b PM |
134 | /* do it again in 60s */ |
135 | last_rtc_update = xtime.tv_sec - 600; | |
1da177e4 | 136 | } |
960c65e8 PZ |
137 | write_sequnlock(&xtime_lock); |
138 | ||
139 | #ifndef CONFIG_SMP | |
140 | update_process_times(user_mode(get_irq_regs())); | |
141 | #endif | |
1da177e4 LT |
142 | } |
143 | ||
3aa770e7 AS |
144 | #ifdef CONFIG_PM |
145 | int timer_suspend(struct sys_device *dev, pm_message_t state) | |
146 | { | |
147 | struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev); | |
148 | ||
149 | sys_timer->ops->stop(); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | int timer_resume(struct sys_device *dev) | |
155 | { | |
156 | struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev); | |
157 | ||
158 | sys_timer->ops->start(); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | #else | |
163 | #define timer_suspend NULL | |
164 | #define timer_resume NULL | |
165 | #endif | |
166 | ||
36ddf31b | 167 | static struct sysdev_class timer_sysclass = { |
af5ca3f4 | 168 | .name = "timer", |
3aa770e7 AS |
169 | .suspend = timer_suspend, |
170 | .resume = timer_resume, | |
1da177e4 LT |
171 | }; |
172 | ||
57be2b48 | 173 | static int __init timer_init_sysfs(void) |
bd156147 | 174 | { |
07821d33 MD |
175 | int ret; |
176 | ||
177 | if (!sys_timer) | |
178 | return 0; | |
179 | ||
180 | ret = sysdev_class_register(&timer_sysclass); | |
57be2b48 PM |
181 | if (ret != 0) |
182 | return ret; | |
bd156147 | 183 | |
57be2b48 PM |
184 | sys_timer->dev.cls = &timer_sysclass; |
185 | return sysdev_register(&sys_timer->dev); | |
bd156147 | 186 | } |
57be2b48 | 187 | device_initcall(timer_init_sysfs); |
bd156147 | 188 | |
57be2b48 | 189 | void (*board_time_init)(void); |
bd156147 | 190 | |
955c0778 | 191 | struct clocksource clocksource_sh = { |
57be2b48 | 192 | .name = "SuperH", |
57be2b48 | 193 | }; |
bd156147 | 194 | |
57be2b48 | 195 | unsigned long long sched_clock(void) |
bd156147 | 196 | { |
955c0778 MD |
197 | unsigned long long cycles; |
198 | ||
199 | /* jiffies based sched_clock if no clocksource is installed */ | |
200 | if (!clocksource_sh.rating) | |
201 | return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ); | |
202 | ||
8e19608e | 203 | cycles = clocksource_sh.read(&clocksource_sh); |
955c0778 | 204 | return cyc2ns(&clocksource_sh, cycles); |
bd156147 | 205 | } |
bd156147 | 206 | |
8e0b8429 | 207 | static void __init sh_late_time_init(void) |
1da177e4 | 208 | { |
eaab8919 MD |
209 | /* |
210 | * Make sure all compiled-in early timers register themselves. | |
211 | * Run probe() for one "earlytimer" device. | |
212 | */ | |
213 | early_platform_driver_register_all("earlytimer"); | |
214 | if (early_platform_driver_probe("earlytimer", 1, 0)) | |
215 | return; | |
216 | ||
1da177e4 | 217 | /* |
36ddf31b PM |
218 | * Find the timer to use as the system timer, it will be |
219 | * initialized for us. | |
1da177e4 | 220 | */ |
36ddf31b | 221 | sys_timer = get_sys_timer(); |
07821d33 MD |
222 | if (unlikely(!sys_timer)) |
223 | panic("System timer missing.\n"); | |
224 | ||
36ddf31b | 225 | printk(KERN_INFO "Using %s for system timer\n", sys_timer->name); |
1da177e4 | 226 | } |
8e0b8429 MD |
227 | |
228 | void __init time_init(void) | |
229 | { | |
230 | if (board_time_init) | |
231 | board_time_init(); | |
232 | ||
233 | clk_init(); | |
234 | ||
235 | rtc_sh_get_time(&xtime); | |
236 | set_normalized_timespec(&wall_to_monotonic, | |
237 | -xtime.tv_sec, -xtime.tv_nsec); | |
238 | ||
239 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST | |
240 | local_timer_setup(smp_processor_id()); | |
241 | #endif | |
242 | ||
243 | late_time_init = sh_late_time_init; | |
244 | } | |
245 |