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CRISv10 memset library add lineendings to asm
[mirror_ubuntu-focal-kernel.git] / arch / cris / arch-v10 / kernel / fasttimer.c
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d8e5219f 1/*
1da177e4
LT		 2 * linux/arch/cris/kernel/fasttimer.c
3 *
4 * Fast timers for ETRAX100/ETRAX100LX
1da177e4 5 *
d8e5219f 6 * Copyright (C) 2000-2007 Axis Communications AB, Lund, Sweden
1da177e4
LT		 7 */
8
9#include <linux/errno.h>
10#include <linux/sched.h>
11#include <linux/kernel.h>
12#include <linux/param.h>
13#include <linux/string.h>
14#include <linux/mm.h>
15#include <linux/vmalloc.h>
16#include <linux/interrupt.h>
17#include <linux/time.h>
18#include <linux/delay.h>
19
20#include <asm/segment.h>
21#include <asm/io.h>
22#include <asm/irq.h>
23#include <asm/delay.h>
24#include <asm/rtc.h>
25
1da177e4
LT		 26
27#include <asm/arch/svinto.h>
28#include <asm/fasttimer.h>
29#include <linux/proc_fs.h>
30
31
32#define DEBUG_LOG_INCLUDED
33#define FAST_TIMER_LOG
34//#define FAST_TIMER_TEST
35
36#define FAST_TIMER_SANITY_CHECKS
37
38#ifdef FAST_TIMER_SANITY_CHECKS
39#define SANITYCHECK(x) x
d8e5219f 40static int sanity_failed;
1da177e4
LT		 41#else
42#define SANITYCHECK(x)
43#endif
44
45#define D1(x)
46#define D2(x)
47#define DP(x)
48
49#define __INLINE__ inline
50
d8e5219f
JN		 51static unsigned int fast_timer_running;
52static unsigned int fast_timers_added;
53static unsigned int fast_timers_started;
54static unsigned int fast_timers_expired;
55static unsigned int fast_timers_deleted;
56static unsigned int fast_timer_is_init;
57static unsigned int fast_timer_ints;
1da177e4
LT		 58
59struct fast_timer *fast_timer_list = NULL;
60
61#ifdef DEBUG_LOG_INCLUDED
62#define DEBUG_LOG_MAX 128
63static const char * debug_log_string[DEBUG_LOG_MAX];
64static unsigned long debug_log_value[DEBUG_LOG_MAX];
d8e5219f
JN		 65static unsigned int debug_log_cnt;
66static unsigned int debug_log_cnt_wrapped;
1da177e4
LT		 67
68#define DEBUG_LOG(string, value) \
69{ \
70 unsigned long log_flags; \
7e920426 71 local_irq_save(log_flags); \
1da177e4
LT		 72 debug_log_string[debug_log_cnt] = (string); \
73 debug_log_value[debug_log_cnt] = (unsigned long)(value); \
74 if (++debug_log_cnt >= DEBUG_LOG_MAX) \
75 { \
76 debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
77 debug_log_cnt_wrapped = 1; \
78 } \
7e920426 79 local_irq_restore(log_flags); \
1da177e4
LT		 80}
81#else
82#define DEBUG_LOG(string, value)
83#endif
84
85
86/* The frequencies for index = clkselx number in R_TIMER_CTRL */
87#define NUM_TIMER_FREQ 15
88#define MAX_USABLE_TIMER_FREQ 7
89#define MAX_DELAY_US 853333L
90const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
91{
92 3, /* 0 3333 - 853333 us */
93 6, /* 1 1666 - 426666 us */
94 12, /* 2 833 - 213333 us */
95 24, /* 3 416 - 106666 us */
96 48, /* 4 208 - 53333 us */
97 96, /* 5 104 - 26666 us */
98 192, /* 6 52 - 13333 us */
99 384, /* 7 26 - 6666 us */
100 576,
101 1152,
102 2304,
103 4608,
104 9216,
105 18432,
106 62500,
107 /* 15 = cascade */
108};
109#define NUM_TIMER_STATS 16
110#ifdef FAST_TIMER_LOG
111struct fast_timer timer_added_log[NUM_TIMER_STATS];
112struct fast_timer timer_started_log[NUM_TIMER_STATS];
113struct fast_timer timer_expired_log[NUM_TIMER_STATS];
114#endif
115
116int timer_div_settings[NUM_TIMER_STATS];
117int timer_freq_settings[NUM_TIMER_STATS];
118int timer_delay_settings[NUM_TIMER_STATS];
119
120/* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
d8e5219f 121void __INLINE__ do_gettimeofday_fast(struct fasttime_t *tv)
1da177e4 122{
d8e5219f
JN		 123 tv->tv_jiff = jiffies;
124 tv->tv_usec = GET_JIFFIES_USEC();
1da177e4
LT		 125}
126
d8e5219f 127int __INLINE__ timeval_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
1da177e4 128{
d8e5219f
JN		 129 /* Compare jiffies. Takes care of wrapping */
130 if (time_before(t0->tv_jiff, t1->tv_jiff))
131 return -1;
132 else if (time_after(t0->tv_jiff, t1->tv_jiff))
133 return 1;
134
135 /* Compare us */
136 if (t0->tv_usec < t1->tv_usec)
137 return -1;
138 else if (t0->tv_usec > t1->tv_usec)
139 return 1;
140 return 0;
1da177e4
LT		 141}
142
143void __INLINE__ start_timer1(unsigned long delay_us)
144{
145 int freq_index = 0; /* This is the lowest resolution */
146 unsigned long upper_limit = MAX_DELAY_US;
147
148 unsigned long div;
149 /* Start/Restart the timer to the new shorter value */
150 /* t = 1/freq = 1/19200 = 53us
151 * T=div*t, div = T/t = delay_us*freq/1000000
152 */
153#if 1 /* Adaptive timer settings */
154 while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
155 {
156 freq_index++;
157 upper_limit >>= 1; /* Divide by 2 using shift */
158 }
159 if (freq_index > 0)
160 {
161 freq_index--;
162 }
163#else
164 freq_index = 6;
165#endif
166 div = delay_us * timer_freq_100[freq_index]/10000;
167 if (div < 2)
168 {
169 /* Maybe increase timer freq? */
170 div = 2;
171 }
172 if (div > 255)
173 {
174 div = 0; /* This means 256, the max the timer takes */
175 /* If a longer timeout than the timer can handle is used,
176 * then we must restart it when it goes off.
177 */
178 }
179
180 timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
181 timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
182 timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
183
d8e5219f 184 D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
1da177e4
LT		 185 delay_us, freq_index, div));
186 /* Clear timer1 irq */
187 *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
188
189 /* Set timer values */
190 *R_TIMER_CTRL = r_timer_ctrl_shadow =
191 (r_timer_ctrl_shadow &
192 ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
193 ~IO_MASK(R_TIMER_CTRL, tm1) &
194 ~IO_MASK(R_TIMER_CTRL, clksel1)) |
195 IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
196 IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
197 IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
198
199 /* Ack interrupt */
200 *R_TIMER_CTRL = r_timer_ctrl_shadow |
201 IO_STATE(R_TIMER_CTRL, i1, clr);
202
203 /* Start timer */
204 *R_TIMER_CTRL = r_timer_ctrl_shadow =
205 (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
206 IO_STATE(R_TIMER_CTRL, tm1, run);
207
208 /* Enable timer1 irq */
209 *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
210 fast_timers_started++;
211 fast_timer_running = 1;
212}
213
214/* In version 1.4 this function takes 27 - 50 us */
215void start_one_shot_timer(struct fast_timer *t,
216 fast_timer_function_type *function,
217 unsigned long data,
218 unsigned long delay_us,
219 const char *name)
220{
221 unsigned long flags;
222 struct fast_timer *tmp;
223
224 D1(printk("sft %s %d us\n", name, delay_us));
225
7e920426 226 local_irq_save(flags);
1da177e4
LT		 227
228 do_gettimeofday_fast(&t->tv_set);
229 tmp = fast_timer_list;
230
231 SANITYCHECK({ /* Check so this is not in the list already... */
232 while (tmp != NULL)
233 {
234 if (tmp == t)
235 {
236 printk(KERN_WARNING
237 "timer name: %s data: 0x%08lX already in list!\n", name, data);
238 sanity_failed++;
d8e5219f 239 goto done;
1da177e4
LT		 240 }
241 else
242 {
243 tmp = tmp->next;
244 }
245 }
246 tmp = fast_timer_list;
247 });
248
249 t->delay_us = delay_us;
250 t->function = function;
251 t->data = data;
252 t->name = name;
253
254 t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
d8e5219f 255 t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
1da177e4
LT		 256 if (t->tv_expires.tv_usec > 1000000)
257 {
258 t->tv_expires.tv_usec -= 1000000;
d8e5219f 259 t->tv_expires.tv_jiff += HZ;
1da177e4
LT		 260 }
261#ifdef FAST_TIMER_LOG
262 timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
263#endif
264 fast_timers_added++;
265
266 /* Check if this should timeout before anything else */
267 if (tmp == NULL || timeval_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
268 {
269 /* Put first in list and modify the timer value */
270 t->prev = NULL;
271 t->next = fast_timer_list;
272 if (fast_timer_list)
273 {
274 fast_timer_list->prev = t;
275 }
276 fast_timer_list = t;
277#ifdef FAST_TIMER_LOG
278 timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
279#endif
280 start_timer1(delay_us);
281 } else {
282 /* Put in correct place in list */
283 while (tmp->next &&
284 timeval_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
285 {
286 tmp = tmp->next;
287 }
288 /* Insert t after tmp */
289 t->prev = tmp;
290 t->next = tmp->next;
291 if (tmp->next)
292 {
293 tmp->next->prev = t;
294 }
295 tmp->next = t;
296 }
297
298 D2(printk("start_one_shot_timer: %d us done\n", delay_us));
299
d8e5219f 300done:
7e920426 301 local_irq_restore(flags);
1da177e4
LT		 302} /* start_one_shot_timer */
303
304static inline int fast_timer_pending (const struct fast_timer * t)
305{
306 return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
307}
308
309static inline int detach_fast_timer (struct fast_timer *t)
310{
311 struct fast_timer *next, *prev;
312 if (!fast_timer_pending(t))
313 return 0;
314 next = t->next;
315 prev = t->prev;
316 if (next)
317 next->prev = prev;
318 if (prev)
319 prev->next = next;
320 else
321 fast_timer_list = next;
322 fast_timers_deleted++;
323 return 1;
324}
325
326int del_fast_timer(struct fast_timer * t)
327{
328 unsigned long flags;
329 int ret;
330
7e920426 331 local_irq_save(flags);
1da177e4
LT		 332 ret = detach_fast_timer(t);
333 t->next = t->prev = NULL;
7e920426 334 local_irq_restore(flags);
1da177e4
LT		 335 return ret;
336} /* del_fast_timer */
337
338
339/* Interrupt routines or functions called in interrupt context */
340
341/* Timer 1 interrupt handler */
342
343static irqreturn_t
d8e5219f 344timer1_handler(int irq, void *dev_id)
1da177e4
LT		 345{
346 struct fast_timer *t;
347 unsigned long flags;
348
d8e5219f
JN		 349 /* We keep interrupts disabled not only when we modify the
350 * fast timer list, but any time we hold a reference to a
351 * timer in the list, since del_fast_timer may be called
352 * from (another) interrupt context. Thus, the only time
353 * when interrupts are enabled is when calling the timer
354 * callback function.
355 */
7e920426 356 local_irq_save(flags);
1da177e4
LT		 357
358 /* Clear timer1 irq */
359 *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
360
361 /* First stop timer, then ack interrupt */
362 /* Stop timer */
363 *R_TIMER_CTRL = r_timer_ctrl_shadow =
364 (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
365 IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
366
367 /* Ack interrupt */
368 *R_TIMER_CTRL = r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
369
370 fast_timer_running = 0;
371 fast_timer_ints++;
372
1da177e4
LT		 373 t = fast_timer_list;
374 while (t)
375 {
d8e5219f
JN		 376 struct fasttime_t tv;
377 fast_timer_function_type *f;
378 unsigned long d;
1da177e4
LT		 379
380 /* Has it really expired? */
381 do_gettimeofday_fast(&tv);
d8e5219f
JN		 382 D1(printk(KERN_DEBUG "t: %is %06ius\n",
383 tv.tv_jiff, tv.tv_usec));
1da177e4
LT		 384
385 if (timeval_cmp(&t->tv_expires, &tv) <= 0)
386 {
387 /* Yes it has expired */
388#ifdef FAST_TIMER_LOG
389 timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
390#endif
391 fast_timers_expired++;
392
393 /* Remove this timer before call, since it may reuse the timer */
1da177e4
LT		 394 if (t->prev)
395 {
396 t->prev->next = t->next;
397 }
398 else
399 {
400 fast_timer_list = t->next;
401 }
402 if (t->next)
403 {
404 t->next->prev = t->prev;
405 }
406 t->prev = NULL;
407 t->next = NULL;
1da177e4 408
d8e5219f
JN		 409 /* Save function callback data before enabling
410 * interrupts, since the timer may be removed and
411 * we don't know how it was allocated
412 * (e.g. ->function and ->data may become overwritten
413 * after deletion if the timer was stack-allocated).
414 */
415 f = t->function;
416 d = t->data;
417
418 if (f != NULL) {
419 /* Run callback with interrupts enabled. */
420 local_irq_restore(flags);
421 f(d);
422 local_irq_save(flags);
423 } else
1da177e4 424 DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
1da177e4
LT		 425 }
426 else
427 {
428 /* Timer is to early, let's set it again using the normal routines */
429 D1(printk(".\n"));
430 }
431
1da177e4
LT		 432 if ((t = fast_timer_list) != NULL)
433 {
434 /* Start next timer.. */
d8e5219f
JN		 435 long us = 0;
436 struct fasttime_t tv;
1da177e4
LT		 437
438 do_gettimeofday_fast(&tv);
d8e5219f
JN		 439
440 /* time_after_eq takes care of wrapping */
441 if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
442 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
443 1000000 / HZ + t->tv_expires.tv_usec -
444 tv.tv_usec);
445
1da177e4
LT		 446 if (us > 0)
447 {
448 if (!fast_timer_running)
449 {
450#ifdef FAST_TIMER_LOG
451 timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
452#endif
453 start_timer1(us);
454 }
1da177e4
LT		 455 break;
456 }
457 else
458 {
459 /* Timer already expired, let's handle it better late than never.
460 * The normal loop handles it
461 */
462 D1(printk("e! %d\n", us));
463 }
464 }
1da177e4
LT		 465 }
466
d8e5219f
JN		 467 local_irq_restore(flags);
468
1da177e4
LT		 469 if (!t)
470 {
471 D1(printk("t1 stop!\n"));
472 }
473
474 return IRQ_HANDLED;
475}
476
477static void wake_up_func(unsigned long data)
478{
479#ifdef DECLARE_WAITQUEUE
480 wait_queue_head_t *sleep_wait_p = (wait_queue_head_t*)data;
481#else
482 struct wait_queue **sleep_wait_p = (struct wait_queue **)data;
483#endif
484 wake_up(sleep_wait_p);
485}
486
487
488/* Useful API */
489
490void schedule_usleep(unsigned long us)
491{
492 struct fast_timer t;
1da177e4
LT		 493 wait_queue_head_t sleep_wait;
494 init_waitqueue_head(&sleep_wait);
1da177e4
LT		 495
496 D1(printk("schedule_usleep(%d)\n", us));
1da177e4
LT		 497 start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
498 "usleep");
d8e5219f
JN		 499 /* Uninterruptible sleep on the fast timer. (The condition is somewhat
500 * redundant since the timer is what wakes us up.) */
501 wait_event(sleep_wait, !fast_timer_pending(&t));
502
1da177e4 503 D1(printk("done schedule_usleep(%d)\n", us));
1da177e4
LT		 504}
505
506#ifdef CONFIG_PROC_FS
507static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
508 ,int *eof, void *data_unused);
509static struct proc_dir_entry *fasttimer_proc_entry;
510#endif /* CONFIG_PROC_FS */
511
512#ifdef CONFIG_PROC_FS
513
514/* This value is very much based on testing */
515#define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
516
517static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
518 ,int *eof, void *data_unused)
519{
520 unsigned long flags;
521 int i = 0;
522 int num_to_show;
d8e5219f 523 struct fasttime_t tv;
1da177e4
LT		 524 struct fast_timer *t, *nextt;
525 static char *bigbuf = NULL;
526 static unsigned long used;
527
528 if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE)))
529 {
530 used = 0;
d8e5219f
JN		 531 if (buf)
532 buf[0] = '\0';
1da177e4
LT		 533 return 0;
534 }
535
536 if (!offset || !used)
537 {
538 do_gettimeofday_fast(&tv);
539
540 used = 0;
541 used += sprintf(bigbuf + used, "Fast timers added: %i\n",
542 fast_timers_added);
543 used += sprintf(bigbuf + used, "Fast timers started: %i\n",
544 fast_timers_started);
545 used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
546 fast_timer_ints);
547 used += sprintf(bigbuf + used, "Fast timers expired: %i\n",
548 fast_timers_expired);
549 used += sprintf(bigbuf + used, "Fast timers deleted: %i\n",
550 fast_timers_deleted);
551 used += sprintf(bigbuf + used, "Fast timer running: %s\n",
552 fast_timer_running ? "yes" : "no");
553 used += sprintf(bigbuf + used, "Current time: %lu.%06lu\n",
d8e5219f 554 (unsigned long)tv.tv_jiff,
1da177e4
LT		 555 (unsigned long)tv.tv_usec);
556#ifdef FAST_TIMER_SANITY_CHECKS
557 used += sprintf(bigbuf + used, "Sanity failed: %i\n",
558 sanity_failed);
559#endif
560 used += sprintf(bigbuf + used, "\n");
561
562#ifdef DEBUG_LOG_INCLUDED
563 {
564 int end_i = debug_log_cnt;
565 i = 0;
566
567 if (debug_log_cnt_wrapped)
568 {
569 i = debug_log_cnt;
570 }
571
572 while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
573 used+100 < BIG_BUF_SIZE)
574 {
575 used += sprintf(bigbuf + used, debug_log_string[i],
576 debug_log_value[i]);
577 i = (i+1) % DEBUG_LOG_MAX;
578 }
579 }
580 used += sprintf(bigbuf + used, "\n");
581#endif
582
583 num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
584 NUM_TIMER_STATS);
585 used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
586 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
587 {
588 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
589
590#if 1 //ndef FAST_TIMER_LOG
591 used += sprintf(bigbuf + used, "div: %i freq: %i delay: %i"
592 "\n",
593 timer_div_settings[cur],
594 timer_freq_settings[cur],
595 timer_delay_settings[cur]
596 );
597#endif
598#ifdef FAST_TIMER_LOG
599 t = &timer_started_log[cur];
600 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
601 "d: %6li us data: 0x%08lX"
602 "\n",
603 t->name,
d8e5219f 604 (unsigned long)t->tv_set.tv_jiff,
1da177e4 605 (unsigned long)t->tv_set.tv_usec,
d8e5219f 606 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 607 (unsigned long)t->tv_expires.tv_usec,
608 t->delay_us,
609 t->data
610 );
611#endif
612 }
613 used += sprintf(bigbuf + used, "\n");
614
615#ifdef FAST_TIMER_LOG
616 num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
617 NUM_TIMER_STATS);
618 used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
619 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
620 {
621 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
622 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
623 "d: %6li us data: 0x%08lX"
624 "\n",
625 t->name,
d8e5219f 626 (unsigned long)t->tv_set.tv_jiff,
1da177e4 627 (unsigned long)t->tv_set.tv_usec,
d8e5219f 628 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 629 (unsigned long)t->tv_expires.tv_usec,
630 t->delay_us,
631 t->data
632 );
633 }
634 used += sprintf(bigbuf + used, "\n");
635
636 num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
637 NUM_TIMER_STATS);
638 used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
639 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
640 {
641 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
642 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
643 "d: %6li us data: 0x%08lX"
644 "\n",
645 t->name,
d8e5219f 646 (unsigned long)t->tv_set.tv_jiff,
1da177e4 647 (unsigned long)t->tv_set.tv_usec,
d8e5219f 648 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 649 (unsigned long)t->tv_expires.tv_usec,
650 t->delay_us,
651 t->data
652 );
653 }
654 used += sprintf(bigbuf + used, "\n");
655#endif
656
657 used += sprintf(bigbuf + used, "Active timers:\n");
7e920426 658 local_irq_save(flags);
1da177e4
LT		 659 t = fast_timer_list;
660 while (t != NULL && (used+100 < BIG_BUF_SIZE))
661 {
662 nextt = t->next;
7e920426 663 local_irq_restore(flags);
1da177e4
LT		 664 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
665 "d: %6li us data: 0x%08lX"
666/* " func: 0x%08lX" */
667 "\n",
668 t->name,
d8e5219f 669 (unsigned long)t->tv_set.tv_jiff,
1da177e4 670 (unsigned long)t->tv_set.tv_usec,
d8e5219f 671 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 672 (unsigned long)t->tv_expires.tv_usec,
673 t->delay_us,
674 t->data
675/* , t->function */
676 );
d8e5219f 677 local_irq_save(flags);
1da177e4
LT		 678 if (t->next != nextt)
679 {
680 printk(KERN_WARNING "timer removed!\n");
681 }
682 t = nextt;
683 }
7e920426 684 local_irq_restore(flags);
1da177e4
LT		 685 }
686
687 if (used - offset < len)
688 {
689 len = used - offset;
690 }
691
692 memcpy(buf, bigbuf + offset, len);
693 *start = buf;
694 *eof = 1;
695
696 return len;
697}
698#endif /* PROC_FS */
699
700#ifdef FAST_TIMER_TEST
701static volatile unsigned long i = 0;
702static volatile int num_test_timeout = 0;
703static struct fast_timer tr[10];
704static int exp_num[10];
705
d8e5219f 706static struct fasttime_t tv_exp[100];
1da177e4
LT		 707
708static void test_timeout(unsigned long data)
709{
710 do_gettimeofday_fast(&tv_exp[data]);
711 exp_num[data] = num_test_timeout;
712
713 num_test_timeout++;
714}
715
716static void test_timeout1(unsigned long data)
717{
718 do_gettimeofday_fast(&tv_exp[data]);
719 exp_num[data] = num_test_timeout;
720 if (data < 7)
721 {
722 start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
723 i++;
724 }
725 num_test_timeout++;
726}
727
728DP(
729static char buf0[2000];
730static char buf1[2000];
731static char buf2[2000];
732static char buf3[2000];
733static char buf4[2000];
734);
735
736static char buf5[6000];
737static int j_u[1000];
738
739static void fast_timer_test(void)
740{
741 int prev_num;
742 int j;
743
d8e5219f 744 struct fasttime_t tv, tv0, tv1, tv2;
1da177e4
LT		 745
746 printk("fast_timer_test() start\n");
747 do_gettimeofday_fast(&tv);
748
749 for (j = 0; j < 1000; j++)
750 {
751 j_u[j] = GET_JIFFIES_USEC();
752 }
753 for (j = 0; j < 100; j++)
754 {
755 do_gettimeofday_fast(&tv_exp[j]);
756 }
d8e5219f
JN		 757 printk(KERN_DEBUG "fast_timer_test() %is %06i\n",
758 tv.tv_jiff, tv.tv_usec);
1da177e4
LT		 759
760 for (j = 0; j < 1000; j++)
761 {
762 printk("%i %i %i %i %i\n",j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
763 j += 4;
764 }
765 for (j = 0; j < 100; j++)
766 {
d8e5219f
JN		 767 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
768 tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
769 tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
770 tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
771 tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
772 tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
1da177e4
LT		 773 j += 4;
774 }
775 do_gettimeofday_fast(&tv0);
776 start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
777 DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
778 i++;
779 start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
780 DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
781 i++;
782 start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
783 DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
784 i++;
785 start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
786 DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
787 i++;
788 start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
789 DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
790 i++;
791 do_gettimeofday_fast(&tv1);
792
793 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
794
795 prev_num = num_test_timeout;
796 while (num_test_timeout < i)
797 {
798 if (num_test_timeout != prev_num)
799 {
800 prev_num = num_test_timeout;
801 }
802 }
803 do_gettimeofday_fast(&tv2);
d8e5219f
JN		 804 printk(KERN_DEBUG "Timers started %is %06i\n",
805 tv0.tv_jiff, tv0.tv_usec);
806 printk(KERN_DEBUG "Timers started at %is %06i\n",
807 tv1.tv_jiff, tv1.tv_usec);
808 printk(KERN_DEBUG "Timers done %is %06i\n",
809 tv2.tv_jiff, tv2.tv_usec);
1da177e4
LT		 810 DP(printk("buf0:\n");
811 printk(buf0);
812 printk("buf1:\n");
813 printk(buf1);
814 printk("buf2:\n");
815 printk(buf2);
816 printk("buf3:\n");
817 printk(buf3);
818 printk("buf4:\n");
819 printk(buf4);
820 );
821 printk("buf5:\n");
822 printk(buf5);
823
824 printk("timers set:\n");
825 for(j = 0; j<i; j++)
826 {
827 struct fast_timer *t = &tr[j];
828 printk("%-10s set: %6is %06ius exp: %6is %06ius "
829 "data: 0x%08X func: 0x%08X\n",
830 t->name,
d8e5219f 831 t->tv_set.tv_jiff,
1da177e4 832 t->tv_set.tv_usec,
d8e5219f 833 t->tv_expires.tv_jiff,
1da177e4
LT		 834 t->tv_expires.tv_usec,
835 t->data,
836 t->function
837 );
838
839 printk(" del: %6ius did exp: %6is %06ius as #%i error: %6li\n",
840 t->delay_us,
d8e5219f 841 tv_exp[j].tv_jiff,
1da177e4
LT		 842 tv_exp[j].tv_usec,
843 exp_num[j],
d8e5219f
JN		 844 (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
845 1000000 + tv_exp[j].tv_usec -
846 t->tv_expires.tv_usec);
1da177e4
LT		 847 }
848 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
849 printk("buf5 after all done:\n");
850 printk(buf5);
851 printk("fast_timer_test() done\n");
852}
853#endif
854
855
d8e5219f 856int fast_timer_init(void)
1da177e4
LT		 857{
858 /* For some reason, request_irq() hangs when called froom time_init() */
859 if (!fast_timer_is_init)
860 {
861#if 0 && defined(FAST_TIMER_TEST)
862 int i;
863#endif
864
865 printk(KERN_INFO "fast_timer_init()\n");
866
867#if 0 && defined(FAST_TIMER_TEST)
868 for (i = 0; i <= TIMER0_DIV; i++)
869 {
870 /* We must be careful not to get overflow... */
871 printk("%3i %6u\n", i, timer0_value_us[i]);
872 }
873#endif
874#ifdef CONFIG_PROC_FS
875 if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 )))
876 fasttimer_proc_entry->read_proc = proc_fasttimer_read;
877#endif /* PROC_FS */
7e920426 878 if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
1da177e4
LT		 879 "fast timer int", NULL))
880 {
881 printk("err: timer1 irq\n");
882 }
883 fast_timer_is_init = 1;
884#ifdef FAST_TIMER_TEST
885 printk("do test\n");
886 fast_timer_test();
887#endif
888 }
d8e5219f 889 return 0;
1da177e4 890}
d8e5219f 891__initcall(fast_timer_init);
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