1 /*
2 * linux/arch/cris/kernel/fasttimer.c
3 *
4 * Fast timers for ETRAX FS
5 *
6 * Copyright (C) 2000-2006 Axis Communications AB, Lund, Sweden
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/vmalloc.h>
15 #include <linux/interrupt.h>
16 #include <linux/time.h>
17 #include <linux/delay.h>
18
19 #include <asm/irq.h>
20 #include <asm/system.h>
21
22 #include <hwregs/reg_map.h>
23 #include <hwregs/reg_rdwr.h>
24 #include <hwregs/timer_defs.h>
25 #include <asm/fasttimer.h>
26 #include <linux/proc_fs.h>
27
28 /*
29 * timer0 is running at 100MHz and generating jiffies timer ticks
30 * at 100 or 1000 HZ.
31 * fasttimer gives an API that gives timers that expire "between" the jiffies
32 * giving microsecond resolution (10 ns).
33 * fasttimer uses reg_timer_rw_trig register to get interrupt when
34 * r_time reaches a certain value.
35 */
36
37
38 #define DEBUG_LOG_INCLUDED
39 #define FAST_TIMER_LOG
40 /* #define FAST_TIMER_TEST */
41
42 #define FAST_TIMER_SANITY_CHECKS
43
44 #ifdef FAST_TIMER_SANITY_CHECKS
45 static int sanity_failed;
46 #endif
47
48 #define D1(x)
49 #define D2(x)
50 #define DP(x)
51
52 static unsigned int fast_timer_running;
53 static unsigned int fast_timers_added;
54 static unsigned int fast_timers_started;
55 static unsigned int fast_timers_expired;
56 static unsigned int fast_timers_deleted;
57 static unsigned int fast_timer_is_init;
58 static unsigned int fast_timer_ints;
59
60 struct fast_timer *fast_timer_list = NULL;
61
62 #ifdef DEBUG_LOG_INCLUDED
63 #define DEBUG_LOG_MAX 128
64 static const char * debug_log_string[DEBUG_LOG_MAX];
65 static unsigned long debug_log_value[DEBUG_LOG_MAX];
66 static unsigned int debug_log_cnt;
67 static unsigned int debug_log_cnt_wrapped;
68
69 #define DEBUG_LOG(string, value) \
70 { \
71 unsigned long log_flags; \
72 local_irq_save(log_flags); \
73 debug_log_string[debug_log_cnt] = (string); \
74 debug_log_value[debug_log_cnt] = (unsigned long)(value); \
75 if (++debug_log_cnt >= DEBUG_LOG_MAX) \
76 { \
77 debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
78 debug_log_cnt_wrapped = 1; \
79 } \
80 local_irq_restore(log_flags); \
81 }
82 #else
83 #define DEBUG_LOG(string, value)
84 #endif
85
86
87 #define NUM_TIMER_STATS 16
88 #ifdef FAST_TIMER_LOG
89 struct fast_timer timer_added_log[NUM_TIMER_STATS];
90 struct fast_timer timer_started_log[NUM_TIMER_STATS];
91 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
92 #endif
93
94 int timer_div_settings[NUM_TIMER_STATS];
95 int timer_delay_settings[NUM_TIMER_STATS];
96
97 struct work_struct fast_work;
98
99 static void
100 timer_trig_handler(struct work_struct *work);
101
102
103
104 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
do_gettimeofday_fast(struct fasttime_t * tv)105 inline void do_gettimeofday_fast(struct fasttime_t *tv)
106 {
107 tv->tv_jiff = jiffies;
108 tv->tv_usec = GET_JIFFIES_USEC();
109 }
110
fasttime_cmp(struct fasttime_t * t0,struct fasttime_t * t1)111 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
112 {
113 /* Compare jiffies. Takes care of wrapping */
114 if (time_before(t0->tv_jiff, t1->tv_jiff))
115 return -1;
116 else if (time_after(t0->tv_jiff, t1->tv_jiff))
117 return 1;
118
119 /* Compare us */
120 if (t0->tv_usec < t1->tv_usec)
121 return -1;
122 else if (t0->tv_usec > t1->tv_usec)
123 return 1;
124 return 0;
125 }
126
127 /* Called with ints off */
start_timer_trig(unsigned long delay_us)128 inline void start_timer_trig(unsigned long delay_us)
129 {
130 reg_timer_rw_ack_intr ack_intr = { 0 };
131 reg_timer_rw_intr_mask intr_mask;
132 reg_timer_rw_trig trig;
133 reg_timer_rw_trig_cfg trig_cfg = { 0 };
134 reg_timer_r_time r_time0;
135 reg_timer_r_time r_time1;
136 unsigned char trig_wrap;
137 unsigned char time_wrap;
138
139 r_time0 = REG_RD(timer, regi_timer0, r_time);
140
141 D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
142 delay_us, freq_index, div));
143 /* Clear trig irq */
144 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
145 intr_mask.trig = 0;
146 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
147
148 /* Set timer values and check if trigger wraps. */
149 /* r_time is 100MHz (10 ns resolution) */
150 trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;
151
152 timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
153 timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
154
155 /* Ack interrupt */
156 ack_intr.trig = 1;
157 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
158
159 /* Start timer */
160 REG_WR(timer, regi_timer0, rw_trig, trig);
161 trig_cfg.tmr = regk_timer_time;
162 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
163
164 /* Check if we have already passed the trig time */
165 r_time1 = REG_RD(timer, regi_timer0, r_time);
166 time_wrap = r_time1 < r_time0;
167
168 if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
169 /* No, Enable trig irq */
170 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
171 intr_mask.trig = 1;
172 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
173 fast_timers_started++;
174 fast_timer_running = 1;
175 } else {
176 /* We have passed the time, disable trig point, ack intr */
177 trig_cfg.tmr = regk_timer_off;
178 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
179 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
180 /* call the int routine */
181 INIT_WORK(&fast_work, timer_trig_handler);
182 schedule_work(&fast_work);
183 }
184
185 }
186
187 /* In version 1.4 this function takes 27 - 50 us */
start_one_shot_timer(struct fast_timer * t,fast_timer_function_type * function,unsigned long data,unsigned long delay_us,const char * name)188 void start_one_shot_timer(struct fast_timer *t,
189 fast_timer_function_type *function,
190 unsigned long data,
191 unsigned long delay_us,
192 const char *name)
193 {
194 unsigned long flags;
195 struct fast_timer *tmp;
196
197 D1(printk("sft %s %d us\n", name, delay_us));
198
199 local_irq_save(flags);
200
201 do_gettimeofday_fast(&t->tv_set);
202 tmp = fast_timer_list;
203
204 #ifdef FAST_TIMER_SANITY_CHECKS
205 /* Check so this is not in the list already... */
206 while (tmp != NULL) {
207 if (tmp == t) {
208 printk(KERN_DEBUG
209 "timer name: %s data: 0x%08lX already "
210 "in list!\n", name, data);
211 sanity_failed++;
212 goto done;
213 } else
214 tmp = tmp->next;
215 }
216 tmp = fast_timer_list;
217 #endif
218
219 t->delay_us = delay_us;
220 t->function = function;
221 t->data = data;
222 t->name = name;
223
224 t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
225 t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
226 if (t->tv_expires.tv_usec > 1000000) {
227 t->tv_expires.tv_usec -= 1000000;
228 t->tv_expires.tv_jiff += HZ;
229 }
230 #ifdef FAST_TIMER_LOG
231 timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
232 #endif
233 fast_timers_added++;
234
235 /* Check if this should timeout before anything else */
236 if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
237 /* Put first in list and modify the timer value */
238 t->prev = NULL;
239 t->next = fast_timer_list;
240 if (fast_timer_list)
241 fast_timer_list->prev = t;
242 fast_timer_list = t;
243 #ifdef FAST_TIMER_LOG
244 timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
245 #endif
246 start_timer_trig(delay_us);
247 } else {
248 /* Put in correct place in list */
249 while (tmp->next &&
250 fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
251 tmp = tmp->next;
252 /* Insert t after tmp */
253 t->prev = tmp;
254 t->next = tmp->next;
255 if (tmp->next)
256 {
257 tmp->next->prev = t;
258 }
259 tmp->next = t;
260 }
261
262 D2(printk("start_one_shot_timer: %d us done\n", delay_us));
263
264 done:
265 local_irq_restore(flags);
266 } /* start_one_shot_timer */
267
fast_timer_pending(const struct fast_timer * t)268 static inline int fast_timer_pending (const struct fast_timer * t)
269 {
270 return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
271 }
272
detach_fast_timer(struct fast_timer * t)273 static inline int detach_fast_timer (struct fast_timer *t)
274 {
275 struct fast_timer *next, *prev;
276 if (!fast_timer_pending(t))
277 return 0;
278 next = t->next;
279 prev = t->prev;
280 if (next)
281 next->prev = prev;
282 if (prev)
283 prev->next = next;
284 else
285 fast_timer_list = next;
286 fast_timers_deleted++;
287 return 1;
288 }
289
del_fast_timer(struct fast_timer * t)290 int del_fast_timer(struct fast_timer * t)
291 {
292 unsigned long flags;
293 int ret;
294
295 local_irq_save(flags);
296 ret = detach_fast_timer(t);
297 t->next = t->prev = NULL;
298 local_irq_restore(flags);
299 return ret;
300 } /* del_fast_timer */
301
302
303 /* Interrupt routines or functions called in interrupt context */
304
305 /* Timer interrupt handler for trig interrupts */
306
307 static irqreturn_t
timer_trig_interrupt(int irq,void * dev_id)308 timer_trig_interrupt(int irq, void *dev_id)
309 {
310 reg_timer_r_masked_intr masked_intr;
311 /* Check if the timer interrupt is for us (a trig int) */
312 masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
313 if (!masked_intr.trig)
314 return IRQ_NONE;
315 timer_trig_handler(NULL);
316 return IRQ_HANDLED;
317 }
318
timer_trig_handler(struct work_struct * work)319 static void timer_trig_handler(struct work_struct *work)
320 {
321 reg_timer_rw_ack_intr ack_intr = { 0 };
322 reg_timer_rw_intr_mask intr_mask;
323 reg_timer_rw_trig_cfg trig_cfg = { 0 };
324 struct fast_timer *t;
325 unsigned long flags;
326
327 /* We keep interrupts disabled not only when we modify the
328 * fast timer list, but any time we hold a reference to a
329 * timer in the list, since del_fast_timer may be called
330 * from (another) interrupt context. Thus, the only time
331 * when interrupts are enabled is when calling the timer
332 * callback function.
333 */
334 local_irq_save(flags);
335
336 /* Clear timer trig interrupt */
337 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
338 intr_mask.trig = 0;
339 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
340
341 /* First stop timer, then ack interrupt */
342 /* Stop timer */
343 trig_cfg.tmr = regk_timer_off;
344 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
345
346 /* Ack interrupt */
347 ack_intr.trig = 1;
348 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
349
350 fast_timer_running = 0;
351 fast_timer_ints++;
352
353 fast_timer_function_type *f;
354 unsigned long d;
355
356 t = fast_timer_list;
357 while (t) {
358 struct fasttime_t tv;
359
360 /* Has it really expired? */
361 do_gettimeofday_fast(&tv);
362 D1(printk(KERN_DEBUG
363 "t: %is %06ius\n", tv.tv_jiff, tv.tv_usec));
364
365 if (fasttime_cmp(&t->tv_expires, &tv) <= 0) {
366 /* Yes it has expired */
367 #ifdef FAST_TIMER_LOG
368 timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
369 #endif
370 fast_timers_expired++;
371
372 /* Remove this timer before call, since it may reuse the timer */
373 if (t->prev)
374 t->prev->next = t->next;
375 else
376 fast_timer_list = t->next;
377 if (t->next)
378 t->next->prev = t->prev;
379 t->prev = NULL;
380 t->next = NULL;
381
382 /* Save function callback data before enabling
383 * interrupts, since the timer may be removed and we
384 * don't know how it was allocated (e.g. ->function
385 * and ->data may become overwritten after deletion
386 * if the timer was stack-allocated).
387 */
388 f = t->function;
389 d = t->data;
390
391 if (f != NULL) {
392 /* Run the callback function with interrupts
393 * enabled. */
394 local_irq_restore(flags);
395 f(d);
396 local_irq_save(flags);
397 } else
398 DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
399 } else {
400 /* Timer is to early, let's set it again using the normal routines */
401 D1(printk(".\n"));
402 }
403
404 t = fast_timer_list;
405 if (t != NULL) {
406 /* Start next timer.. */
407 long us = 0;
408 struct fasttime_t tv;
409
410 do_gettimeofday_fast(&tv);
411
412 /* time_after_eq takes care of wrapping */
413 if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
414 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
415 1000000 / HZ + t->tv_expires.tv_usec -
416 tv.tv_usec);
417
418 if (us > 0) {
419 if (!fast_timer_running) {
420 #ifdef FAST_TIMER_LOG
421 timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
422 #endif
423 start_timer_trig(us);
424 }
425 break;
426 } else {
427 /* Timer already expired, let's handle it better late than never.
428 * The normal loop handles it
429 */
430 D1(printk("e! %d\n", us));
431 }
432 }
433 }
434
435 local_irq_restore(flags);
436
437 if (!t)
438 D1(printk("ttrig stop!\n"));
439 }
440
wake_up_func(unsigned long data)441 static void wake_up_func(unsigned long data)
442 {
443 wait_queue_head_t *sleep_wait_p = (wait_queue_head_t*)data;
444 wake_up(sleep_wait_p);
445 }
446
447
448 /* Useful API */
449
schedule_usleep(unsigned long us)450 void schedule_usleep(unsigned long us)
451 {
452 struct fast_timer t;
453 wait_queue_head_t sleep_wait;
454 init_waitqueue_head(&sleep_wait);
455
456 D1(printk("schedule_usleep(%d)\n", us));
457 start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
458 "usleep");
459 /* Uninterruptible sleep on the fast timer. (The condition is
460 * somewhat redundant since the timer is what wakes us up.) */
461 wait_event(sleep_wait, !fast_timer_pending(&t));
462
463 D1(printk("done schedule_usleep(%d)\n", us));
464 }
465
466 #ifdef CONFIG_PROC_FS
467 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
468 ,int *eof, void *data_unused);
469 static struct proc_dir_entry *fasttimer_proc_entry;
470 #endif /* CONFIG_PROC_FS */
471
472 #ifdef CONFIG_PROC_FS
473
474 /* This value is very much based on testing */
475 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
476
proc_fasttimer_read(char * buf,char ** start,off_t offset,int len,int * eof,void * data_unused)477 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
478 ,int *eof, void *data_unused)
479 {
480 unsigned long flags;
481 int i = 0;
482 int num_to_show;
483 struct fasttime_t tv;
484 struct fast_timer *t, *nextt;
485 static char *bigbuf = NULL;
486 static unsigned long used;
487
488 if (!bigbuf) {
489 bigbuf = vmalloc(BIG_BUF_SIZE);
490 if (!bigbuf) {
491 used = 0;
492 if (buf)
493 buf[0] = '\0';
494 return 0;
495 }
496 }
497
498 if (!offset || !used) {
499 do_gettimeofday_fast(&tv);
500
501 used = 0;
502 used += sprintf(bigbuf + used, "Fast timers added: %i\n",
503 fast_timers_added);
504 used += sprintf(bigbuf + used, "Fast timers started: %i\n",
505 fast_timers_started);
506 used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
507 fast_timer_ints);
508 used += sprintf(bigbuf + used, "Fast timers expired: %i\n",
509 fast_timers_expired);
510 used += sprintf(bigbuf + used, "Fast timers deleted: %i\n",
511 fast_timers_deleted);
512 used += sprintf(bigbuf + used, "Fast timer running: %s\n",
513 fast_timer_running ? "yes" : "no");
514 used += sprintf(bigbuf + used, "Current time: %lu.%06lu\n",
515 (unsigned long)tv.tv_jiff,
516 (unsigned long)tv.tv_usec);
517 #ifdef FAST_TIMER_SANITY_CHECKS
518 used += sprintf(bigbuf + used, "Sanity failed: %i\n",
519 sanity_failed);
520 #endif
521 used += sprintf(bigbuf + used, "\n");
522
523 #ifdef DEBUG_LOG_INCLUDED
524 {
525 int end_i = debug_log_cnt;
526 i = 0;
527
528 if (debug_log_cnt_wrapped)
529 i = debug_log_cnt;
530
531 while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
532 used+100 < BIG_BUF_SIZE)
533 {
534 used += sprintf(bigbuf + used, debug_log_string[i],
535 debug_log_value[i]);
536 i = (i+1) % DEBUG_LOG_MAX;
537 }
538 }
539 used += sprintf(bigbuf + used, "\n");
540 #endif
541
542 num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
543 NUM_TIMER_STATS);
544 used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
545 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
546 {
547 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
548
549 #if 1 //ndef FAST_TIMER_LOG
550 used += sprintf(bigbuf + used, "div: %i delay: %i"
551 "\n",
552 timer_div_settings[cur],
553 timer_delay_settings[cur]
554 );
555 #endif
556 #ifdef FAST_TIMER_LOG
557 t = &timer_started_log[cur];
558 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
559 "d: %6li us data: 0x%08lX"
560 "\n",
561 t->name,
562 (unsigned long)t->tv_set.tv_jiff,
563 (unsigned long)t->tv_set.tv_usec,
564 (unsigned long)t->tv_expires.tv_jiff,
565 (unsigned long)t->tv_expires.tv_usec,
566 t->delay_us,
567 t->data
568 );
569 #endif
570 }
571 used += sprintf(bigbuf + used, "\n");
572
573 #ifdef FAST_TIMER_LOG
574 num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
575 NUM_TIMER_STATS);
576 used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
577 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
578 {
579 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
580 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
581 "d: %6li us data: 0x%08lX"
582 "\n",
583 t->name,
584 (unsigned long)t->tv_set.tv_jiff,
585 (unsigned long)t->tv_set.tv_usec,
586 (unsigned long)t->tv_expires.tv_jiff,
587 (unsigned long)t->tv_expires.tv_usec,
588 t->delay_us,
589 t->data
590 );
591 }
592 used += sprintf(bigbuf + used, "\n");
593
594 num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
595 NUM_TIMER_STATS);
596 used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
597 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
598 {
599 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
600 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
601 "d: %6li us data: 0x%08lX"
602 "\n",
603 t->name,
604 (unsigned long)t->tv_set.tv_jiff,
605 (unsigned long)t->tv_set.tv_usec,
606 (unsigned long)t->tv_expires.tv_jiff,
607 (unsigned long)t->tv_expires.tv_usec,
608 t->delay_us,
609 t->data
610 );
611 }
612 used += sprintf(bigbuf + used, "\n");
613 #endif
614
615 used += sprintf(bigbuf + used, "Active timers:\n");
616 local_irq_save(flags);
617 t = fast_timer_list;
618 while (t != NULL && (used+100 < BIG_BUF_SIZE))
619 {
620 nextt = t->next;
621 local_irq_restore(flags);
622 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
623 "d: %6li us data: 0x%08lX"
624 /* " func: 0x%08lX" */
625 "\n",
626 t->name,
627 (unsigned long)t->tv_set.tv_jiff,
628 (unsigned long)t->tv_set.tv_usec,
629 (unsigned long)t->tv_expires.tv_jiff,
630 (unsigned long)t->tv_expires.tv_usec,
631 t->delay_us,
632 t->data
633 /* , t->function */
634 );
635 local_irq_save(flags);
636 if (t->next != nextt)
637 {
638 printk("timer removed!\n");
639 }
640 t = nextt;
641 }
642 local_irq_restore(flags);
643 }
644
645 if (used - offset < len)
646 {
647 len = used - offset;
648 }
649
650 memcpy(buf, bigbuf + offset, len);
651 *start = buf;
652 *eof = 1;
653
654 return len;
655 }
656 #endif /* PROC_FS */
657
658 #ifdef FAST_TIMER_TEST
659 static volatile unsigned long i = 0;
660 static volatile int num_test_timeout = 0;
661 static struct fast_timer tr[10];
662 static int exp_num[10];
663
664 static struct fasttime_t tv_exp[100];
665
test_timeout(unsigned long data)666 static void test_timeout(unsigned long data)
667 {
668 do_gettimeofday_fast(&tv_exp[data]);
669 exp_num[data] = num_test_timeout;
670
671 num_test_timeout++;
672 }
673
test_timeout1(unsigned long data)674 static void test_timeout1(unsigned long data)
675 {
676 do_gettimeofday_fast(&tv_exp[data]);
677 exp_num[data] = num_test_timeout;
678 if (data < 7)
679 {
680 start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
681 i++;
682 }
683 num_test_timeout++;
684 }
685
686 DP(
687 static char buf0[2000];
688 static char buf1[2000];
689 static char buf2[2000];
690 static char buf3[2000];
691 static char buf4[2000];
692 );
693
694 static char buf5[6000];
695 static int j_u[1000];
696
fast_timer_test(void)697 static void fast_timer_test(void)
698 {
699 int prev_num;
700 int j;
701
702 struct fasttime_t tv, tv0, tv1, tv2;
703
704 printk("fast_timer_test() start\n");
705 do_gettimeofday_fast(&tv);
706
707 for (j = 0; j < 1000; j++)
708 {
709 j_u[j] = GET_JIFFIES_USEC();
710 }
711 for (j = 0; j < 100; j++)
712 {
713 do_gettimeofday_fast(&tv_exp[j]);
714 }
715 printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
716
717 for (j = 0; j < 1000; j++)
718 {
719 printk(KERN_DEBUG "%i %i %i %i %i\n",
720 j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
721 j += 4;
722 }
723 for (j = 0; j < 100; j++)
724 {
725 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
726 tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
727 tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
728 tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
729 tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
730 tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
731 j += 4;
732 }
733 do_gettimeofday_fast(&tv0);
734 start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
735 DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
736 i++;
737 start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
738 DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
739 i++;
740 start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
741 DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
742 i++;
743 start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
744 DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
745 i++;
746 start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
747 DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
748 i++;
749 do_gettimeofday_fast(&tv1);
750
751 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
752
753 prev_num = num_test_timeout;
754 while (num_test_timeout < i)
755 {
756 if (num_test_timeout != prev_num)
757 prev_num = num_test_timeout;
758 }
759 do_gettimeofday_fast(&tv2);
760 printk(KERN_INFO "Timers started %is %06i\n",
761 tv0.tv_jiff, tv0.tv_usec);
762 printk(KERN_INFO "Timers started at %is %06i\n",
763 tv1.tv_jiff, tv1.tv_usec);
764 printk(KERN_INFO "Timers done %is %06i\n",
765 tv2.tv_jiff, tv2.tv_usec);
766 DP(printk("buf0:\n");
767 printk(buf0);
768 printk("buf1:\n");
769 printk(buf1);
770 printk("buf2:\n");
771 printk(buf2);
772 printk("buf3:\n");
773 printk(buf3);
774 printk("buf4:\n");
775 printk(buf4);
776 );
777 printk("buf5:\n");
778 printk(buf5);
779
780 printk("timers set:\n");
781 for(j = 0; j<i; j++)
782 {
783 struct fast_timer *t = &tr[j];
784 printk("%-10s set: %6is %06ius exp: %6is %06ius "
785 "data: 0x%08X func: 0x%08X\n",
786 t->name,
787 t->tv_set.tv_jiff,
788 t->tv_set.tv_usec,
789 t->tv_expires.tv_jiff,
790 t->tv_expires.tv_usec,
791 t->data,
792 t->function
793 );
794
795 printk(" del: %6ius did exp: %6is %06ius as #%i error: %6li\n",
796 t->delay_us,
797 tv_exp[j].tv_jiff,
798 tv_exp[j].tv_usec,
799 exp_num[j],
800 (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
801 1000000 + tv_exp[j].tv_usec -
802 t->tv_expires.tv_usec);
803 }
804 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
805 printk("buf5 after all done:\n");
806 printk(buf5);
807 printk("fast_timer_test() done\n");
808 }
809 #endif
810
811
fast_timer_init(void)812 int fast_timer_init(void)
813 {
814 /* For some reason, request_irq() hangs when called froom time_init() */
815 if (!fast_timer_is_init)
816 {
817 printk("fast_timer_init()\n");
818
819 #ifdef CONFIG_PROC_FS
820 fasttimer_proc_entry = create_proc_entry("fasttimer", 0, 0);
821 if (fasttimer_proc_entry)
822 fasttimer_proc_entry->read_proc = proc_fasttimer_read;
823 #endif /* PROC_FS */
824 if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
825 IRQF_SHARED | IRQF_DISABLED,
826 "fast timer int", &fast_timer_list))
827 printk(KERN_ERR "err: fasttimer irq\n");
828 fast_timer_is_init = 1;
829 #ifdef FAST_TIMER_TEST
830 printk("do test\n");
831 fast_timer_test();
832 #endif
833 }
834 return 0;
835 }
836 __initcall(fast_timer_init);
837