summaryrefslogtreecommitdiffstats
path: root/arch/cris/arch-v32/kernel/fasttimer.c
blob: eb4e0ff3629566abf69c2b46de720d5e99b3de1e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
/*
 * linux/arch/cris/kernel/fasttimer.c
 *
 * Fast timers for ETRAX FS
 *
 * Copyright (C) 2000-2006 Axis Communications AB, Lund, Sweden
 */

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/vmalloc.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/delay.h>

#include <asm/irq.h>

#include <hwregs/reg_map.h>
#include <hwregs/reg_rdwr.h>
#include <hwregs/timer_defs.h>
#include <asm/fasttimer.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>

/*
 * timer0 is running at 100MHz and generating jiffies timer ticks
 * at 100 or 1000 HZ.
 * fasttimer gives an API that gives timers that expire "between" the jiffies
 * giving microsecond resolution (10 ns).
 * fasttimer uses reg_timer_rw_trig register to get interrupt when
 * r_time reaches a certain value.
 */


#define DEBUG_LOG_INCLUDED
#define FAST_TIMER_LOG
/* #define FAST_TIMER_TEST */

#define FAST_TIMER_SANITY_CHECKS

#ifdef FAST_TIMER_SANITY_CHECKS
static int sanity_failed;
#endif

#define D1(x)
#define D2(x)
#define DP(x)

static unsigned int fast_timer_running;
static unsigned int fast_timers_added;
static unsigned int fast_timers_started;
static unsigned int fast_timers_expired;
static unsigned int fast_timers_deleted;
static unsigned int fast_timer_is_init;
static unsigned int fast_timer_ints;

struct fast_timer *fast_timer_list = NULL;

#ifdef DEBUG_LOG_INCLUDED
#define DEBUG_LOG_MAX 128
static const char * debug_log_string[DEBUG_LOG_MAX];
static unsigned long debug_log_value[DEBUG_LOG_MAX];
static unsigned int debug_log_cnt;
static unsigned int debug_log_cnt_wrapped;

#define DEBUG_LOG(string, value) \
{ \
  unsigned long log_flags; \
  local_irq_save(log_flags); \
  debug_log_string[debug_log_cnt] = (string); \
  debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  { \
    debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
    debug_log_cnt_wrapped = 1; \
  } \
  local_irq_restore(log_flags); \
}
#else
#define DEBUG_LOG(string, value)
#endif


#define NUM_TIMER_STATS 16
#ifdef FAST_TIMER_LOG
struct fast_timer timer_added_log[NUM_TIMER_STATS];
struct fast_timer timer_started_log[NUM_TIMER_STATS];
struct fast_timer timer_expired_log[NUM_TIMER_STATS];
#endif

int timer_div_settings[NUM_TIMER_STATS];
int timer_delay_settings[NUM_TIMER_STATS];

struct work_struct fast_work;

static void
timer_trig_handler(struct work_struct *work);



/* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
inline void do_gettimeofday_fast(struct fasttime_t *tv)
{
	tv->tv_jiff = jiffies;
	tv->tv_usec = GET_JIFFIES_USEC();
}

inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
{
	/* Compare jiffies. Takes care of wrapping */
	if (time_before(t0->tv_jiff, t1->tv_jiff))
		return -1;
	else if (time_after(t0->tv_jiff, t1->tv_jiff))
		return 1;

	/* Compare us */
	if (t0->tv_usec < t1->tv_usec)
		return -1;
	else if (t0->tv_usec > t1->tv_usec)
		return 1;
	return 0;
}

/* Called with ints off */
inline void start_timer_trig(unsigned long delay_us)
{
  reg_timer_rw_ack_intr ack_intr = { 0 };
  reg_timer_rw_intr_mask intr_mask;
  reg_timer_rw_trig trig;
  reg_timer_rw_trig_cfg trig_cfg = { 0 };
	reg_timer_r_time r_time0;
	reg_timer_r_time r_time1;
	unsigned char trig_wrap;
	unsigned char time_wrap;

	r_time0 = REG_RD(timer, regi_timer0, r_time);

  D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
            delay_us, freq_index, div));
  /* Clear trig irq */
	intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
  intr_mask.trig = 0;
	REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);

	/* Set timer values and check if trigger wraps. */
	/* r_time is 100MHz (10 ns resolution) */
	trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;

  timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
  timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;

  /* Ack interrupt */
  ack_intr.trig = 1;
	REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);

  /* Start timer */
	REG_WR(timer, regi_timer0, rw_trig, trig);
  trig_cfg.tmr = regk_timer_time;
	REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);

  /* Check if we have already passed the trig time */
	r_time1 = REG_RD(timer, regi_timer0, r_time);
	time_wrap = r_time1 < r_time0;

	if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
    /* No, Enable trig irq */
		intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
    intr_mask.trig = 1;
		REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
    fast_timers_started++;
    fast_timer_running = 1;
	} else {
    /* We have passed the time, disable trig point, ack intr */
    trig_cfg.tmr = regk_timer_off;
		REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
		REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
		/* call the int routine */
		INIT_WORK(&fast_work, timer_trig_handler);
		schedule_work(&fast_work);
  }

}

/* In version 1.4 this function takes 27 - 50 us */
void start_one_shot_timer(struct fast_timer *t,
                          fast_timer_function_type *function,
                          unsigned long data,
                          unsigned long delay_us,
                          const char *name)
{
  unsigned long flags;
  struct fast_timer *tmp;

  D1(printk("sft %s %d us\n", name, delay_us));

  local_irq_save(flags);

  do_gettimeofday_fast(&t->tv_set);
  tmp = fast_timer_list;

#ifdef FAST_TIMER_SANITY_CHECKS
	/* Check so this is not in the list already... */
	while (tmp != NULL) {
		if (tmp == t) {
			printk(KERN_DEBUG
				"timer name: %s data: 0x%08lX already "
				"in list!\n", name, data);
			sanity_failed++;
			goto done;
		} else
			tmp = tmp->next;
	}
	tmp = fast_timer_list;
#endif

  t->delay_us = delay_us;
  t->function = function;
  t->data = data;
  t->name = name;

  t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
	t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
	if (t->tv_expires.tv_usec > 1000000) {
    t->tv_expires.tv_usec -= 1000000;
		t->tv_expires.tv_jiff += HZ;
  }
#ifdef FAST_TIMER_LOG
  timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
#endif
  fast_timers_added++;

  /* Check if this should timeout before anything else */
  if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
    /* Put first in list and modify the timer value */
    t->prev = NULL;
    t->next = fast_timer_list;
    if (fast_timer_list)
      fast_timer_list->prev = t;
    fast_timer_list = t;
#ifdef FAST_TIMER_LOG
    timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
#endif
    start_timer_trig(delay_us);
  } else {
    /* Put in correct place in list */
    while (tmp->next &&
        fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
      tmp = tmp->next;
    /* Insert t after tmp */
    t->prev = tmp;
    t->next = tmp->next;
    if (tmp->next)
    {
      tmp->next->prev = t;
    }
    tmp->next = t;
  }

  D2(printk("start_one_shot_timer: %d us done\n", delay_us));

done:
  local_irq_restore(flags);
} /* start_one_shot_timer */

static inline int fast_timer_pending (const struct fast_timer * t)
{
  return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
}

static inline int detach_fast_timer (struct fast_timer *t)
{
  struct fast_timer *next, *prev;
  if (!fast_timer_pending(t))
    return 0;
  next = t->next;
  prev = t->prev;
  if (next)
    next->prev = prev;
  if (prev)
    prev->next = next;
  else
    fast_timer_list = next;
  fast_timers_deleted++;
  return 1;
}

int del_fast_timer(struct fast_timer * t)
{
  unsigned long flags;
  int ret;

  local_irq_save(flags);
  ret = detach_fast_timer(t);
  t->next = t->prev = NULL;
  local_irq_restore(flags);
  return ret;
} /* del_fast_timer */


/* Interrupt routines or functions called in interrupt context */

/* Timer interrupt handler for trig interrupts */

static irqreturn_t
timer_trig_interrupt(int irq, void *dev_id)
{
  reg_timer_r_masked_intr masked_intr;
  /* Check if the timer interrupt is for us (a trig int) */
	masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
  if (!masked_intr.trig)
    return IRQ_NONE;
	timer_trig_handler(NULL);
  return IRQ_HANDLED;
}

static void timer_trig_handler(struct work_struct *work)
{
	reg_timer_rw_ack_intr ack_intr = { 0 };
	reg_timer_rw_intr_mask intr_mask;
	reg_timer_rw_trig_cfg trig_cfg = { 0 };
	struct fast_timer *t;
	fast_timer_function_type *f;
	unsigned long d;
	unsigned long flags;

	/* We keep interrupts disabled not only when we modify the
	 * fast timer list, but any time we hold a reference to a
	 * timer in the list, since del_fast_timer may be called
	 * from (another) interrupt context.  Thus, the only time
	 * when interrupts are enabled is when calling the timer
	 * callback function.
	 */
  local_irq_save(flags);

  /* Clear timer trig interrupt */
	intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
  intr_mask.trig = 0;
  REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);

  /* First stop timer, then ack interrupt */
  /* Stop timer */
  trig_cfg.tmr = regk_timer_off;
	REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);

  /* Ack interrupt */
  ack_intr.trig = 1;
	REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);

  fast_timer_running = 0;
  fast_timer_ints++;

  t = fast_timer_list;
	while (t) {
		struct fasttime_t tv;

    /* Has it really expired? */
    do_gettimeofday_fast(&tv);
		D1(printk(KERN_DEBUG
			"t: %is %06ius\n", tv.tv_jiff, tv.tv_usec));

		if (fasttime_cmp(&t->tv_expires, &tv) <= 0) {
      /* Yes it has expired */
#ifdef FAST_TIMER_LOG
      timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
#endif
      fast_timers_expired++;

      /* Remove this timer before call, since it may reuse the timer */
      if (t->prev)
        t->prev->next = t->next;
      else
        fast_timer_list = t->next;
      if (t->next)
        t->next->prev = t->prev;
      t->prev = NULL;
      t->next = NULL;

			/* Save function callback data before enabling
			 * interrupts, since the timer may be removed and we
			 * don't know how it was allocated (e.g. ->function
			 * and ->data may become overwritten after deletion
			 * if the timer was stack-allocated).
			 */
			f = t->function;
			d = t->data;

			if (f != NULL) {
				/* Run the callback function with interrupts
				 * enabled. */
				local_irq_restore(flags);
				f(d);
				local_irq_save(flags);
			} else
        DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
		} else {
      /* Timer is to early, let's set it again using the normal routines */
      D1(printk(".\n"));
    }

		t = fast_timer_list;
		if (t != NULL) {
      /* Start next timer.. */
			long us = 0;
			struct fasttime_t tv;

      do_gettimeofday_fast(&tv);

			/* time_after_eq takes care of wrapping */
			if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
				us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
					1000000 / HZ + t->tv_expires.tv_usec -
					tv.tv_usec);

			if (us > 0) {
				if (!fast_timer_running) {
#ifdef FAST_TIMER_LOG
          timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
#endif
          start_timer_trig(us);
        }
        break;
			} else {
        /* Timer already expired, let's handle it better late than never.
         * The normal loop handles it
         */
        D1(printk("e! %d\n", us));
      }
    }
  }

	local_irq_restore(flags);

	if (!t)
    D1(printk("ttrig stop!\n"));
}

static void wake_up_func(unsigned long data)
{
  wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
  wake_up(sleep_wait_p);
}


/* Useful API */

void schedule_usleep(unsigned long us)
{
  struct fast_timer t;
  wait_queue_head_t sleep_wait;
  init_waitqueue_head(&sleep_wait);

  D1(printk("schedule_usleep(%d)\n", us));
  start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
                       "usleep");
	/* Uninterruptible sleep on the fast timer. (The condition is
	 * somewhat redundant since the timer is what wakes us up.) */
	wait_event(sleep_wait, !fast_timer_pending(&t));

  D1(printk("done schedule_usleep(%d)\n", us));
}

#ifdef CONFIG_PROC_FS
/* This value is very much based on testing */
#define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)

static int proc_fasttimer_show(struct seq_file *m, void *v)
{
	unsigned long flags;
	int i = 0;
	int num_to_show;
	struct fasttime_t tv;
	struct fast_timer *t, *nextt;

	do_gettimeofday_fast(&tv);

	seq_printf(m, "Fast timers added:     %i\n", fast_timers_added);
	seq_printf(m, "Fast timers started:   %i\n", fast_timers_started);
	seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints);
	seq_printf(m, "Fast timers expired:   %i\n", fast_timers_expired);
	seq_printf(m, "Fast timers deleted:   %i\n", fast_timers_deleted);
	seq_printf(m, "Fast timer running:    %s\n",
		   fast_timer_running ? "yes" : "no");
	seq_printf(m, "Current time:          %lu.%06lu\n",
		   (unsigned long)tv.tv_jiff,
		   (unsigned long)tv.tv_usec);
#ifdef FAST_TIMER_SANITY_CHECKS
	seq_printf(m, "Sanity failed:         %i\n", sanity_failed);
#endif
	seq_putc(m, '\n');

#ifdef DEBUG_LOG_INCLUDED
	{
		int end_i = debug_log_cnt;
		i = 0;

		if (debug_log_cnt_wrapped)
			i = debug_log_cnt;

		while ((i != end_i || debug_log_cnt_wrapped)) {
			seq_printf(m, debug_log_string[i], debug_log_value[i]);
			if (seq_has_overflowed(m))
				return 0;
			i = (i+1) % DEBUG_LOG_MAX;
		}
	}
	seq_putc(m, '\n');
#endif

	num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
		       NUM_TIMER_STATS);
	seq_printf(m, "Timers started: %i\n", fast_timers_started);
	for (i = 0; i < num_to_show; i++) {
		int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;

#if 1 //ndef FAST_TIMER_LOG
		seq_printf(m, "div: %i delay: %i\n",
			   timer_div_settings[cur],
			   timer_delay_settings[cur]);
#endif
#ifdef FAST_TIMER_LOG
		t = &timer_started_log[cur];
		seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
			   t->name,
			   (unsigned long)t->tv_set.tv_jiff,
			   (unsigned long)t->tv_set.tv_usec,
			   (unsigned long)t->tv_expires.tv_jiff,
			   (unsigned long)t->tv_expires.tv_usec,
			   t->delay_us,
			   t->data);
		if (seq_has_overflowed(m))
			return 0;
#endif
	}
	seq_putc(m, '\n');

#ifdef FAST_TIMER_LOG
	num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
		       NUM_TIMER_STATS);
	seq_printf(m, "Timers added: %i\n", fast_timers_added);
	for (i = 0; i < num_to_show; i++) {
		t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
		seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
			   t->name,
			   (unsigned long)t->tv_set.tv_jiff,
			   (unsigned long)t->tv_set.tv_usec,
			   (unsigned long)t->tv_expires.tv_jiff,
			   (unsigned long)t->tv_expires.tv_usec,
			   t->delay_us,
			   t->data);
		if (seq_has_overflowed(m))
			return 0;
	}
	seq_putc(m, '\n');

	num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
		       NUM_TIMER_STATS);
	seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
	for (i = 0; i < num_to_show; i++){
		t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
		seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
			   t->name,
			   (unsigned long)t->tv_set.tv_jiff,
			   (unsigned long)t->tv_set.tv_usec,
			   (unsigned long)t->tv_expires.tv_jiff,
			   (unsigned long)t->tv_expires.tv_usec,
			   t->delay_us,
			   t->data);
		if (seq_has_overflowed(m))
			return 0;
	}
	seq_putc(m, '\n');
#endif

	seq_puts(m, "Active timers:\n");
	local_irq_save(flags);
	t = fast_timer_list;
	while (t != NULL){
		nextt = t->next;
		local_irq_restore(flags);
		seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
			   t->name,
			   (unsigned long)t->tv_set.tv_jiff,
			   (unsigned long)t->tv_set.tv_usec,
			   (unsigned long)t->tv_expires.tv_jiff,
			   (unsigned long)t->tv_expires.tv_usec,
			   t->delay_us,
			   t->data);
		if (seq_has_overflowed(m))
			return 0;
		local_irq_save(flags);
		if (t->next != nextt)
			printk("timer removed!\n");
		t = nextt;
	}
	local_irq_restore(flags);
	return 0;
}

static int proc_fasttimer_open(struct inode *inode, struct file *file)
{
	return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
}

static const struct file_operations proc_fasttimer_fops = {
	.open		= proc_fasttimer_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

#endif /* PROC_FS */

#ifdef FAST_TIMER_TEST
static volatile unsigned long i = 0;
static volatile int num_test_timeout = 0;
static struct fast_timer tr[10];
static int exp_num[10];

static struct fasttime_t tv_exp[100];

static void test_timeout(unsigned long data)
{
  do_gettimeofday_fast(&tv_exp[data]);
  exp_num[data] = num_test_timeout;

  num_test_timeout++;
}

static void test_timeout1(unsigned long data)
{
  do_gettimeofday_fast(&tv_exp[data]);
  exp_num[data] = num_test_timeout;
  if (data < 7)
  {
    start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
    i++;
  }
  num_test_timeout++;
}

DP(
static char buf0[2000];
static char buf1[2000];
static char buf2[2000];
static char buf3[2000];
static char buf4[2000];
);

static char buf5[6000];
static int j_u[1000];

static void fast_timer_test(void)
{
  int prev_num;
  int j;

	struct fasttime_t tv, tv0, tv1, tv2;

  printk("fast_timer_test() start\n");
  do_gettimeofday_fast(&tv);

  for (j = 0; j < 1000; j++)
  {
    j_u[j] = GET_JIFFIES_USEC();
  }
  for (j = 0; j < 100; j++)
  {
    do_gettimeofday_fast(&tv_exp[j]);
  }
  printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);

  for (j = 0; j < 1000; j++)
  {
    printk(KERN_DEBUG "%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]);
    j += 4;
  }
  for (j = 0; j < 100; j++)
  {
    printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
			tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
			tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
			tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
			tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
			tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
    j += 4;
  }
  do_gettimeofday_fast(&tv0);
  start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
  DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
  i++;
  start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
  DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
  i++;
  start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
  DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
  i++;
  start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
  DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
  i++;
  start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
  DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
  i++;
  do_gettimeofday_fast(&tv1);

  proc_fasttimer_read(buf5, NULL, 0, 0, 0);

  prev_num = num_test_timeout;
  while (num_test_timeout < i)
  {
    if (num_test_timeout != prev_num)
      prev_num = num_test_timeout;
  }
  do_gettimeofday_fast(&tv2);
	printk(KERN_INFO "Timers started    %is %06i\n",
		tv0.tv_jiff, tv0.tv_usec);
	printk(KERN_INFO "Timers started at %is %06i\n",
		tv1.tv_jiff, tv1.tv_usec);
	printk(KERN_INFO "Timers done       %is %06i\n",
		tv2.tv_jiff, tv2.tv_usec);
  DP(printk("buf0:\n");
     printk(buf0);
     printk("buf1:\n");
     printk(buf1);
     printk("buf2:\n");
     printk(buf2);
     printk("buf3:\n");
     printk(buf3);
     printk("buf4:\n");
     printk(buf4);
  );
  printk("buf5:\n");
  printk(buf5);

  printk("timers set:\n");
  for(j = 0; j<i; j++)
  {
    struct fast_timer *t = &tr[j];
    printk("%-10s set: %6is %06ius exp: %6is %06ius "
           "data: 0x%08X func: 0x%08X\n",
           t->name,
			t->tv_set.tv_jiff,
           t->tv_set.tv_usec,
			t->tv_expires.tv_jiff,
           t->tv_expires.tv_usec,
           t->data,
           t->function
           );

    printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
           t->delay_us,
			tv_exp[j].tv_jiff,
           tv_exp[j].tv_usec,
           exp_num[j],
			(tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
				1000000 + tv_exp[j].tv_usec -
				t->tv_expires.tv_usec);
  }
  proc_fasttimer_read(buf5, NULL, 0, 0, 0);
  printk("buf5 after all done:\n");
  printk(buf5);
  printk("fast_timer_test() done\n");
}
#endif


int fast_timer_init(void)
{
  /* For some reason, request_irq() hangs when called froom time_init() */
  if (!fast_timer_is_init)
  {
    printk("fast_timer_init()\n");

#ifdef CONFIG_PROC_FS
    proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
#endif /* PROC_FS */
		if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
				IRQF_SHARED,
				"fast timer int", &fast_timer_list))
			printk(KERN_ERR "err: fasttimer irq\n");
    fast_timer_is_init = 1;
#ifdef FAST_TIMER_TEST
    printk("do test\n");
    fast_timer_test();
#endif
  }
	return 0;
}
__initcall(fast_timer_init);