sh: remove intc2 code
[deliverable/linux.git] / arch / sh / kernel / time.c
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 - 2007 Paul Mundt
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 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/profile.h>
16 #include <linux/timex.h>
17 #include <linux/sched.h>
18 #include <linux/clockchips.h>
19 #include <asm/clock.h>
20 #include <asm/rtc.h>
21 #include <asm/timer.h>
22 #include <asm/kgdb.h>
23
24 struct sys_timer *sys_timer;
25
26 /* Move this somewhere more sensible.. */
27 DEFINE_SPINLOCK(rtc_lock);
28 EXPORT_SYMBOL(rtc_lock);
29
30 /* Dummy RTC ops */
31 static void null_rtc_get_time(struct timespec *tv)
32 {
33 tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0);
34 tv->tv_nsec = 0;
35 }
36
37 static int null_rtc_set_time(const time_t secs)
38 {
39 return 0;
40 }
41
42 /*
43 * Null high precision timer functions for systems lacking one.
44 */
45 static cycle_t null_hpt_read(void)
46 {
47 return 0;
48 }
49
50 void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
51 int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
52
53 #ifndef CONFIG_GENERIC_TIME
54 void do_gettimeofday(struct timeval *tv)
55 {
56 unsigned long flags;
57 unsigned long seq;
58 unsigned long usec, sec;
59
60 do {
61 /*
62 * Turn off IRQs when grabbing xtime_lock, so that
63 * the sys_timer get_offset code doesn't have to handle it.
64 */
65 seq = read_seqbegin_irqsave(&xtime_lock, flags);
66 usec = get_timer_offset();
67 sec = xtime.tv_sec;
68 usec += xtime.tv_nsec / NSEC_PER_USEC;
69 } while (read_seqretry_irqrestore(&xtime_lock, seq, flags));
70
71 while (usec >= 1000000) {
72 usec -= 1000000;
73 sec++;
74 }
75
76 tv->tv_sec = sec;
77 tv->tv_usec = usec;
78 }
79 EXPORT_SYMBOL(do_gettimeofday);
80
81 int do_settimeofday(struct timespec *tv)
82 {
83 time_t wtm_sec, sec = tv->tv_sec;
84 long wtm_nsec, nsec = tv->tv_nsec;
85
86 if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
87 return -EINVAL;
88
89 write_seqlock_irq(&xtime_lock);
90 /*
91 * This is revolting. We need to set "xtime" correctly. However, the
92 * value in this location is the value at the most recent update of
93 * wall time. Discover what correction gettimeofday() would have
94 * made, and then undo it!
95 */
96 nsec -= get_timer_offset() * NSEC_PER_USEC;
97
98 wtm_sec = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
99 wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);
100
101 set_normalized_timespec(&xtime, sec, nsec);
102 set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);
103
104 ntp_clear();
105 write_sequnlock_irq(&xtime_lock);
106 clock_was_set();
107
108 return 0;
109 }
110 EXPORT_SYMBOL(do_settimeofday);
111 #endif /* !CONFIG_GENERIC_TIME */
112
113 #ifndef CONFIG_GENERIC_CLOCKEVENTS
114 /* last time the RTC clock got updated */
115 static long last_rtc_update;
116
117 /*
118 * handle_timer_tick() needs to keep up the real-time clock,
119 * as well as call the "do_timer()" routine every clocktick
120 */
121 void handle_timer_tick(void)
122 {
123 do_timer(1);
124 #ifndef CONFIG_SMP
125 update_process_times(user_mode(get_irq_regs()));
126 #endif
127 if (current->pid)
128 profile_tick(CPU_PROFILING);
129
130 #ifdef CONFIG_HEARTBEAT
131 if (sh_mv.mv_heartbeat != NULL)
132 sh_mv.mv_heartbeat();
133 #endif
134
135 /*
136 * If we have an externally synchronized Linux clock, then update
137 * RTC clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
138 * called as close as possible to 500 ms before the new second starts.
139 */
140 if (ntp_synced() &&
141 xtime.tv_sec > last_rtc_update + 660 &&
142 (xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
143 (xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
144 if (rtc_sh_set_time(xtime.tv_sec) == 0)
145 last_rtc_update = xtime.tv_sec;
146 else
147 /* do it again in 60s */
148 last_rtc_update = xtime.tv_sec - 600;
149 }
150 }
151 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
152
153 #ifdef CONFIG_PM
154 int timer_suspend(struct sys_device *dev, pm_message_t state)
155 {
156 struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev);
157
158 sys_timer->ops->stop();
159
160 return 0;
161 }
162
163 int timer_resume(struct sys_device *dev)
164 {
165 struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev);
166
167 sys_timer->ops->start();
168
169 return 0;
170 }
171 #else
172 #define timer_suspend NULL
173 #define timer_resume NULL
174 #endif
175
176 static struct sysdev_class timer_sysclass = {
177 set_kset_name("timer"),
178 .suspend = timer_suspend,
179 .resume = timer_resume,
180 };
181
182 static int __init timer_init_sysfs(void)
183 {
184 int ret = sysdev_class_register(&timer_sysclass);
185 if (ret != 0)
186 return ret;
187
188 sys_timer->dev.cls = &timer_sysclass;
189 return sysdev_register(&sys_timer->dev);
190 }
191 device_initcall(timer_init_sysfs);
192
193 void (*board_time_init)(void);
194
195 /*
196 * Shamelessly based on the MIPS and Sparc64 work.
197 */
198 static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
199 unsigned long sh_hpt_frequency = 0;
200
201 #define NSEC_PER_CYC_SHIFT 10
202
203 struct clocksource clocksource_sh = {
204 .name = "SuperH",
205 .rating = 200,
206 .mask = CLOCKSOURCE_MASK(32),
207 .read = null_hpt_read,
208 .shift = 16,
209 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
210 };
211
212 static void __init init_sh_clocksource(void)
213 {
214 if (!sh_hpt_frequency || clocksource_sh.read == null_hpt_read)
215 return;
216
217 clocksource_sh.mult = clocksource_hz2mult(sh_hpt_frequency,
218 clocksource_sh.shift);
219
220 timer_ticks_per_nsec_quotient =
221 clocksource_hz2mult(sh_hpt_frequency, NSEC_PER_CYC_SHIFT);
222
223 clocksource_register(&clocksource_sh);
224 }
225
226 #ifdef CONFIG_GENERIC_TIME
227 unsigned long long sched_clock(void)
228 {
229 unsigned long long ticks = clocksource_sh.read();
230 return (ticks * timer_ticks_per_nsec_quotient) >> NSEC_PER_CYC_SHIFT;
231 }
232 #endif
233
234 void __init time_init(void)
235 {
236 if (board_time_init)
237 board_time_init();
238
239 clk_init();
240
241 rtc_sh_get_time(&xtime);
242 set_normalized_timespec(&wall_to_monotonic,
243 -xtime.tv_sec, -xtime.tv_nsec);
244
245 /*
246 * Find the timer to use as the system timer, it will be
247 * initialized for us.
248 */
249 sys_timer = get_sys_timer();
250 printk(KERN_INFO "Using %s for system timer\n", sys_timer->name);
251
252 if (sys_timer->ops->read)
253 clocksource_sh.read = sys_timer->ops->read;
254
255 init_sh_clocksource();
256
257 if (sh_hpt_frequency)
258 printk("Using %lu.%03lu MHz high precision timer.\n",
259 ((sh_hpt_frequency + 500) / 1000) / 1000,
260 ((sh_hpt_frequency + 500) / 1000) % 1000);
261
262 #if defined(CONFIG_SH_KGDB)
263 /*
264 * Set up kgdb as requested. We do it here because the serial
265 * init uses the timer vars we just set up for figuring baud.
266 */
267 kgdb_init();
268 #endif
269 }
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