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; | |
1da177e4 | 48 | |
47c8a08b PM |
49 | unsigned int get_rtc_time(struct rtc_time *tm) |
50 | { | |
51 | if (rtc_sh_get_time != null_rtc_get_time) { | |
52 | struct timespec tv; | |
53 | ||
54 | rtc_sh_get_time(&tv); | |
55 | rtc_time_to_tm(tv.tv_sec, tm); | |
56 | } | |
57 | ||
58 | return RTC_24H; | |
59 | } | |
60 | EXPORT_SYMBOL(get_rtc_time); | |
61 | ||
62 | int set_rtc_time(struct rtc_time *tm) | |
63 | { | |
64 | unsigned long secs; | |
65 | ||
66 | rtc_tm_to_time(tm, &secs); | |
67 | return rtc_sh_set_time(secs); | |
68 | } | |
69 | EXPORT_SYMBOL(set_rtc_time); | |
70 | ||
42786006 PM |
71 | static int __init rtc_generic_init(void) |
72 | { | |
73 | struct platform_device *pdev; | |
74 | ||
75 | if (rtc_sh_get_time == null_rtc_get_time) | |
76 | return -ENODEV; | |
77 | ||
78 | pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0); | |
79 | if (IS_ERR(pdev)) | |
80 | return PTR_ERR(pdev); | |
81 | ||
82 | return 0; | |
83 | } | |
84 | module_init(rtc_generic_init); | |
85 | ||
1da177e4 LT |
86 | /* last time the RTC clock got updated */ |
87 | static long last_rtc_update; | |
88 | ||
89 | /* | |
36ddf31b | 90 | * handle_timer_tick() needs to keep up the real-time clock, |
1da177e4 LT |
91 | * as well as call the "do_timer()" routine every clocktick |
92 | */ | |
35f3c518 | 93 | void handle_timer_tick(void) |
1da177e4 | 94 | { |
35f3c518 PM |
95 | if (current->pid) |
96 | profile_tick(CPU_PROFILING); | |
1da177e4 | 97 | |
960c65e8 PZ |
98 | /* |
99 | * Here we are in the timer irq handler. We just have irqs locally | |
100 | * disabled but we don't know if the timer_bh is running on the other | |
101 | * CPU. We need to avoid to SMP race with it. NOTE: we don' t need | |
102 | * the irq version of write_lock because as just said we have irq | |
103 | * locally disabled. -arca | |
104 | */ | |
105 | write_seqlock(&xtime_lock); | |
106 | do_timer(1); | |
107 | ||
1da177e4 LT |
108 | /* |
109 | * If we have an externally synchronized Linux clock, then update | |
110 | * RTC clock accordingly every ~11 minutes. Set_rtc_mmss() has to be | |
111 | * called as close as possible to 500 ms before the new second starts. | |
112 | */ | |
b149ee22 | 113 | if (ntp_synced() && |
1da177e4 LT |
114 | xtime.tv_sec > last_rtc_update + 660 && |
115 | (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && | |
116 | (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { | |
af514ca7 | 117 | if (rtc_sh_set_time(xtime.tv_sec) == 0) |
1da177e4 LT |
118 | last_rtc_update = xtime.tv_sec; |
119 | else | |
36ddf31b PM |
120 | /* do it again in 60s */ |
121 | last_rtc_update = xtime.tv_sec - 600; | |
1da177e4 | 122 | } |
960c65e8 PZ |
123 | write_sequnlock(&xtime_lock); |
124 | ||
125 | #ifndef CONFIG_SMP | |
126 | update_process_times(user_mode(get_irq_regs())); | |
127 | #endif | |
1da177e4 LT |
128 | } |
129 | ||
3aa770e7 AS |
130 | #ifdef CONFIG_PM |
131 | int timer_suspend(struct sys_device *dev, pm_message_t state) | |
132 | { | |
133 | struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev); | |
134 | ||
135 | sys_timer->ops->stop(); | |
136 | ||
137 | return 0; | |
138 | } | |
139 | ||
140 | int timer_resume(struct sys_device *dev) | |
141 | { | |
142 | struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev); | |
143 | ||
144 | sys_timer->ops->start(); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | #else | |
149 | #define timer_suspend NULL | |
150 | #define timer_resume NULL | |
151 | #endif | |
152 | ||
36ddf31b | 153 | static struct sysdev_class timer_sysclass = { |
af5ca3f4 | 154 | .name = "timer", |
3aa770e7 AS |
155 | .suspend = timer_suspend, |
156 | .resume = timer_resume, | |
1da177e4 LT |
157 | }; |
158 | ||
57be2b48 | 159 | static int __init timer_init_sysfs(void) |
bd156147 | 160 | { |
07821d33 MD |
161 | int ret; |
162 | ||
163 | if (!sys_timer) | |
164 | return 0; | |
165 | ||
166 | ret = sysdev_class_register(&timer_sysclass); | |
57be2b48 PM |
167 | if (ret != 0) |
168 | return ret; | |
bd156147 | 169 | |
57be2b48 PM |
170 | sys_timer->dev.cls = &timer_sysclass; |
171 | return sysdev_register(&sys_timer->dev); | |
bd156147 | 172 | } |
57be2b48 | 173 | device_initcall(timer_init_sysfs); |
bd156147 | 174 | |
57be2b48 | 175 | void (*board_time_init)(void); |
bd156147 | 176 | |
955c0778 | 177 | struct clocksource clocksource_sh = { |
57be2b48 | 178 | .name = "SuperH", |
57be2b48 | 179 | }; |
bd156147 | 180 | |
57be2b48 | 181 | unsigned long long sched_clock(void) |
bd156147 | 182 | { |
955c0778 MD |
183 | unsigned long long cycles; |
184 | ||
185 | /* jiffies based sched_clock if no clocksource is installed */ | |
186 | if (!clocksource_sh.rating) | |
187 | return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ); | |
188 | ||
8e19608e | 189 | cycles = clocksource_sh.read(&clocksource_sh); |
955c0778 | 190 | return cyc2ns(&clocksource_sh, cycles); |
bd156147 | 191 | } |
bd156147 | 192 | |
8e0b8429 | 193 | static void __init sh_late_time_init(void) |
1da177e4 | 194 | { |
eaab8919 MD |
195 | /* |
196 | * Make sure all compiled-in early timers register themselves. | |
197 | * Run probe() for one "earlytimer" device. | |
198 | */ | |
199 | early_platform_driver_register_all("earlytimer"); | |
200 | if (early_platform_driver_probe("earlytimer", 1, 0)) | |
201 | return; | |
202 | ||
1da177e4 | 203 | /* |
36ddf31b PM |
204 | * Find the timer to use as the system timer, it will be |
205 | * initialized for us. | |
1da177e4 | 206 | */ |
36ddf31b | 207 | sys_timer = get_sys_timer(); |
07821d33 MD |
208 | if (unlikely(!sys_timer)) |
209 | panic("System timer missing.\n"); | |
210 | ||
36ddf31b | 211 | printk(KERN_INFO "Using %s for system timer\n", sys_timer->name); |
1da177e4 | 212 | } |
8e0b8429 MD |
213 | |
214 | void __init time_init(void) | |
215 | { | |
216 | if (board_time_init) | |
217 | board_time_init(); | |
218 | ||
219 | clk_init(); | |
220 | ||
221 | rtc_sh_get_time(&xtime); | |
222 | set_normalized_timespec(&wall_to_monotonic, | |
223 | -xtime.tv_sec, -xtime.tv_nsec); | |
224 | ||
225 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST | |
226 | local_timer_setup(smp_processor_id()); | |
227 | #endif | |
228 | ||
229 | late_time_init = sh_late_time_init; | |
230 | } | |
231 |