Commit | Line | Data |
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1da177e4 LT |
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> | |
36ddf31b | 6 | * Copyright (C) 2002, 2003, 2004, 2005 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 | */ | |
12 | ||
1da177e4 | 13 | #include <linux/kernel.h> |
36ddf31b | 14 | #include <linux/module.h> |
1da177e4 | 15 | #include <linux/init.h> |
1da177e4 | 16 | #include <linux/profile.h> |
36ddf31b | 17 | #include <asm/clock.h> |
1da177e4 | 18 | #include <asm/rtc.h> |
36ddf31b | 19 | #include <asm/timer.h> |
1da177e4 | 20 | #include <asm/kgdb.h> |
1da177e4 LT |
21 | |
22 | extern unsigned long wall_jiffies; | |
36ddf31b PM |
23 | struct sys_timer *sys_timer; |
24 | ||
25 | /* Move this somewhere more sensible.. */ | |
26 | DEFINE_SPINLOCK(rtc_lock); | |
27 | EXPORT_SYMBOL(rtc_lock); | |
1da177e4 | 28 | |
1da177e4 LT |
29 | /* XXX: Can we initialize this in a routine somewhere? Dreamcast doesn't want |
30 | * these routines anywhere... */ | |
31 | #ifdef CONFIG_SH_RTC | |
af514ca7 PM |
32 | void (*rtc_sh_get_time)(struct timespec *) = sh_rtc_gettimeofday; |
33 | int (*rtc_sh_set_time)(const time_t) = sh_rtc_settimeofday; | |
1da177e4 | 34 | #else |
af514ca7 PM |
35 | void (*rtc_sh_get_time)(struct timespec *); |
36 | int (*rtc_sh_set_time)(const time_t); | |
1da177e4 LT |
37 | #endif |
38 | ||
1da177e4 LT |
39 | /* |
40 | * Scheduler clock - returns current time in nanosec units. | |
41 | */ | |
36ddf31b | 42 | unsigned long long __attribute__ ((weak)) sched_clock(void) |
1da177e4 LT |
43 | { |
44 | return (unsigned long long)jiffies * (1000000000 / HZ); | |
45 | } | |
46 | ||
1da177e4 LT |
47 | void do_gettimeofday(struct timeval *tv) |
48 | { | |
49 | unsigned long seq; | |
50 | unsigned long usec, sec; | |
51 | unsigned long lost; | |
52 | ||
53 | do { | |
54 | seq = read_seqbegin(&xtime_lock); | |
36ddf31b | 55 | usec = get_timer_offset(); |
1da177e4 LT |
56 | |
57 | lost = jiffies - wall_jiffies; | |
58 | if (lost) | |
59 | usec += lost * (1000000 / HZ); | |
60 | ||
61 | sec = xtime.tv_sec; | |
62 | usec += xtime.tv_nsec / 1000; | |
63 | } while (read_seqretry(&xtime_lock, seq)); | |
64 | ||
65 | while (usec >= 1000000) { | |
66 | usec -= 1000000; | |
67 | sec++; | |
68 | } | |
69 | ||
70 | tv->tv_sec = sec; | |
71 | tv->tv_usec = usec; | |
72 | } | |
73 | ||
74 | EXPORT_SYMBOL(do_gettimeofday); | |
75 | ||
76 | int do_settimeofday(struct timespec *tv) | |
77 | { | |
78 | time_t wtm_sec, sec = tv->tv_sec; | |
79 | long wtm_nsec, nsec = tv->tv_nsec; | |
80 | ||
81 | if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC) | |
82 | return -EINVAL; | |
83 | ||
84 | write_seqlock_irq(&xtime_lock); | |
85 | /* | |
86 | * This is revolting. We need to set "xtime" correctly. However, the | |
87 | * value in this location is the value at the most recent update of | |
88 | * wall time. Discover what correction gettimeofday() would have | |
89 | * made, and then undo it! | |
90 | */ | |
36ddf31b | 91 | nsec -= 1000 * (get_timer_offset() + |
1da177e4 LT |
92 | (jiffies - wall_jiffies) * (1000000 / HZ)); |
93 | ||
94 | wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec); | |
95 | wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec); | |
96 | ||
97 | set_normalized_timespec(&xtime, sec, nsec); | |
98 | set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec); | |
99 | ||
b149ee22 | 100 | ntp_clear(); |
1da177e4 LT |
101 | write_sequnlock_irq(&xtime_lock); |
102 | clock_was_set(); | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | EXPORT_SYMBOL(do_settimeofday); | |
108 | ||
109 | /* last time the RTC clock got updated */ | |
110 | static long last_rtc_update; | |
111 | ||
112 | /* | |
36ddf31b | 113 | * handle_timer_tick() needs to keep up the real-time clock, |
1da177e4 LT |
114 | * as well as call the "do_timer()" routine every clocktick |
115 | */ | |
36ddf31b | 116 | void handle_timer_tick(struct pt_regs *regs) |
1da177e4 LT |
117 | { |
118 | do_timer(regs); | |
119 | #ifndef CONFIG_SMP | |
120 | update_process_times(user_mode(regs)); | |
121 | #endif | |
122 | profile_tick(CPU_PROFILING, regs); | |
123 | ||
124 | #ifdef CONFIG_HEARTBEAT | |
125 | if (sh_mv.mv_heartbeat != NULL) | |
126 | sh_mv.mv_heartbeat(); | |
127 | #endif | |
128 | ||
129 | /* | |
130 | * If we have an externally synchronized Linux clock, then update | |
131 | * RTC clock accordingly every ~11 minutes. Set_rtc_mmss() has to be | |
132 | * called as close as possible to 500 ms before the new second starts. | |
133 | */ | |
b149ee22 | 134 | if (ntp_synced() && |
1da177e4 LT |
135 | xtime.tv_sec > last_rtc_update + 660 && |
136 | (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 && | |
137 | (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) { | |
af514ca7 | 138 | if (rtc_sh_set_time(xtime.tv_sec) == 0) |
1da177e4 LT |
139 | last_rtc_update = xtime.tv_sec; |
140 | else | |
36ddf31b PM |
141 | /* do it again in 60s */ |
142 | last_rtc_update = xtime.tv_sec - 600; | |
1da177e4 LT |
143 | } |
144 | } | |
145 | ||
3aa770e7 AS |
146 | #ifdef CONFIG_PM |
147 | int timer_suspend(struct sys_device *dev, pm_message_t state) | |
148 | { | |
149 | struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev); | |
150 | ||
151 | sys_timer->ops->stop(); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | int timer_resume(struct sys_device *dev) | |
157 | { | |
158 | struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev); | |
159 | ||
160 | sys_timer->ops->start(); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | #else | |
165 | #define timer_suspend NULL | |
166 | #define timer_resume NULL | |
167 | #endif | |
168 | ||
36ddf31b PM |
169 | static struct sysdev_class timer_sysclass = { |
170 | set_kset_name("timer"), | |
3aa770e7 AS |
171 | .suspend = timer_suspend, |
172 | .resume = timer_resume, | |
1da177e4 LT |
173 | }; |
174 | ||
36ddf31b | 175 | static int __init timer_init_sysfs(void) |
1da177e4 | 176 | { |
36ddf31b PM |
177 | int ret = sysdev_class_register(&timer_sysclass); |
178 | if (ret != 0) | |
179 | return ret; | |
1da177e4 | 180 | |
36ddf31b PM |
181 | sys_timer->dev.cls = &timer_sysclass; |
182 | return sysdev_register(&sys_timer->dev); | |
183 | } | |
1da177e4 | 184 | |
36ddf31b | 185 | device_initcall(timer_init_sysfs); |
1da177e4 | 186 | |
36ddf31b | 187 | void (*board_time_init)(void); |
1da177e4 LT |
188 | |
189 | void __init time_init(void) | |
190 | { | |
1da177e4 LT |
191 | if (board_time_init) |
192 | board_time_init(); | |
193 | ||
36ddf31b | 194 | clk_init(); |
1da177e4 | 195 | |
af514ca7 PM |
196 | if (rtc_sh_get_time) { |
197 | rtc_sh_get_time(&xtime); | |
1da177e4 LT |
198 | } else { |
199 | xtime.tv_sec = mktime(2000, 1, 1, 0, 0, 0); | |
200 | xtime.tv_nsec = 0; | |
201 | } | |
202 | ||
203 | set_normalized_timespec(&wall_to_monotonic, | |
204 | -xtime.tv_sec, -xtime.tv_nsec); | |
205 | ||
1da177e4 | 206 | /* |
36ddf31b PM |
207 | * Find the timer to use as the system timer, it will be |
208 | * initialized for us. | |
1da177e4 | 209 | */ |
36ddf31b PM |
210 | sys_timer = get_sys_timer(); |
211 | printk(KERN_INFO "Using %s for system timer\n", sys_timer->name); | |
1da177e4 LT |
212 | |
213 | #if defined(CONFIG_SH_KGDB) | |
214 | /* | |
215 | * Set up kgdb as requested. We do it here because the serial | |
216 | * init uses the timer vars we just set up for figuring baud. | |
217 | */ | |
218 | kgdb_init(); | |
219 | #endif | |
220 | } |