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10#include <linux/errno.h>
11#include <linux/sched.h>
12#include <linux/kernel.h>
13#include <linux/param.h>
14#include <linux/string.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/irq.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#include <linux/seq_file.h>
28
29
30
31
32
33
34
35
36
37
38
39#define DEBUG_LOG_INCLUDED
40#define FAST_TIMER_LOG
41
42
43#define FAST_TIMER_SANITY_CHECKS
44
45#ifdef FAST_TIMER_SANITY_CHECKS
46static int sanity_failed;
47#endif
48
49#define D1(x)
50#define D2(x)
51#define DP(x)
52
53static unsigned int fast_timer_running;
54static unsigned int fast_timers_added;
55static unsigned int fast_timers_started;
56static unsigned int fast_timers_expired;
57static unsigned int fast_timers_deleted;
58static unsigned int fast_timer_is_init;
59static unsigned int fast_timer_ints;
60
61struct fast_timer *fast_timer_list = NULL;
62
63#ifdef DEBUG_LOG_INCLUDED
64#define DEBUG_LOG_MAX 128
65static const char * debug_log_string[DEBUG_LOG_MAX];
66static unsigned long debug_log_value[DEBUG_LOG_MAX];
67static unsigned int debug_log_cnt;
68static unsigned int debug_log_cnt_wrapped;
69
70#define DEBUG_LOG(string, value) \
71{ \
72 unsigned long log_flags; \
73 local_irq_save(log_flags); \
74 debug_log_string[debug_log_cnt] = (string); \
75 debug_log_value[debug_log_cnt] = (unsigned long)(value); \
76 if (++debug_log_cnt >= DEBUG_LOG_MAX) \
77 { \
78 debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
79 debug_log_cnt_wrapped = 1; \
80 } \
81 local_irq_restore(log_flags); \
82}
83#else
84#define DEBUG_LOG(string, value)
85#endif
86
87
88#define NUM_TIMER_STATS 16
89#ifdef FAST_TIMER_LOG
90struct fast_timer timer_added_log[NUM_TIMER_STATS];
91struct fast_timer timer_started_log[NUM_TIMER_STATS];
92struct fast_timer timer_expired_log[NUM_TIMER_STATS];
93#endif
94
95int timer_div_settings[NUM_TIMER_STATS];
96int timer_delay_settings[NUM_TIMER_STATS];
97
98struct work_struct fast_work;
99
100static void
101timer_trig_handler(struct work_struct *work);
102
103
104
105
106inline void do_gettimeofday_fast(struct fasttime_t *tv)
107{
108 tv->tv_jiff = jiffies;
109 tv->tv_usec = GET_JIFFIES_USEC();
110}
111
112inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
113{
114
115 if (time_before(t0->tv_jiff, t1->tv_jiff))
116 return -1;
117 else if (time_after(t0->tv_jiff, t1->tv_jiff))
118 return 1;
119
120
121 if (t0->tv_usec < t1->tv_usec)
122 return -1;
123 else if (t0->tv_usec > t1->tv_usec)
124 return 1;
125 return 0;
126}
127
128
129inline void start_timer_trig(unsigned long delay_us)
130{
131 reg_timer_rw_ack_intr ack_intr = { 0 };
132 reg_timer_rw_intr_mask intr_mask;
133 reg_timer_rw_trig trig;
134 reg_timer_rw_trig_cfg trig_cfg = { 0 };
135 reg_timer_r_time r_time0;
136 reg_timer_r_time r_time1;
137 unsigned char trig_wrap;
138 unsigned char time_wrap;
139
140 r_time0 = REG_RD(timer, regi_timer0, r_time);
141
142 D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
143 delay_us, freq_index, div));
144
145 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
146 intr_mask.trig = 0;
147 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
148
149
150
151 trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;
152
153 timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
154 timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
155
156
157 ack_intr.trig = 1;
158 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
159
160
161 REG_WR(timer, regi_timer0, rw_trig, trig);
162 trig_cfg.tmr = regk_timer_time;
163 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
164
165
166 r_time1 = REG_RD(timer, regi_timer0, r_time);
167 time_wrap = r_time1 < r_time0;
168
169 if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
170
171 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
172 intr_mask.trig = 1;
173 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
174 fast_timers_started++;
175 fast_timer_running = 1;
176 } else {
177
178 trig_cfg.tmr = regk_timer_off;
179 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
180 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
181
182 INIT_WORK(&fast_work, timer_trig_handler);
183 schedule_work(&fast_work);
184 }
185
186}
187
188
189void start_one_shot_timer(struct fast_timer *t,
190 fast_timer_function_type *function,
191 unsigned long data,
192 unsigned long delay_us,
193 const char *name)
194{
195 unsigned long flags;
196 struct fast_timer *tmp;
197
198 D1(printk("sft %s %d us\n", name, delay_us));
199
200 local_irq_save(flags);
201
202 do_gettimeofday_fast(&t->tv_set);
203 tmp = fast_timer_list;
204
205#ifdef FAST_TIMER_SANITY_CHECKS
206
207 while (tmp != NULL) {
208 if (tmp == t) {
209 printk(KERN_DEBUG
210 "timer name: %s data: 0x%08lX already "
211 "in list!\n", name, data);
212 sanity_failed++;
213 goto done;
214 } else
215 tmp = tmp->next;
216 }
217 tmp = fast_timer_list;
218#endif
219
220 t->delay_us = delay_us;
221 t->function = function;
222 t->data = data;
223 t->name = name;
224
225 t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
226 t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
227 if (t->tv_expires.tv_usec > 1000000) {
228 t->tv_expires.tv_usec -= 1000000;
229 t->tv_expires.tv_jiff += HZ;
230 }
231#ifdef FAST_TIMER_LOG
232 timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
233#endif
234 fast_timers_added++;
235
236
237 if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
238
239 t->prev = NULL;
240 t->next = fast_timer_list;
241 if (fast_timer_list)
242 fast_timer_list->prev = t;
243 fast_timer_list = t;
244#ifdef FAST_TIMER_LOG
245 timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
246#endif
247 start_timer_trig(delay_us);
248 } else {
249
250 while (tmp->next &&
251 fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
252 tmp = tmp->next;
253
254 t->prev = tmp;
255 t->next = tmp->next;
256 if (tmp->next)
257 {
258 tmp->next->prev = t;
259 }
260 tmp->next = t;
261 }
262
263 D2(printk("start_one_shot_timer: %d us done\n", delay_us));
264
265done:
266 local_irq_restore(flags);
267}
268
269static inline int fast_timer_pending (const struct fast_timer * t)
270{
271 return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
272}
273
274static inline int detach_fast_timer (struct fast_timer *t)
275{
276 struct fast_timer *next, *prev;
277 if (!fast_timer_pending(t))
278 return 0;
279 next = t->next;
280 prev = t->prev;
281 if (next)
282 next->prev = prev;
283 if (prev)
284 prev->next = next;
285 else
286 fast_timer_list = next;
287 fast_timers_deleted++;
288 return 1;
289}
290
291int del_fast_timer(struct fast_timer * t)
292{
293 unsigned long flags;
294 int ret;
295
296 local_irq_save(flags);
297 ret = detach_fast_timer(t);
298 t->next = t->prev = NULL;
299 local_irq_restore(flags);
300 return ret;
301}
302
303
304
305
306
307
308static irqreturn_t
309timer_trig_interrupt(int irq, void *dev_id)
310{
311 reg_timer_r_masked_intr masked_intr;
312
313 masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
314 if (!masked_intr.trig)
315 return IRQ_NONE;
316 timer_trig_handler(NULL);
317 return IRQ_HANDLED;
318}
319
320static void timer_trig_handler(struct work_struct *work)
321{
322 reg_timer_rw_ack_intr ack_intr = { 0 };
323 reg_timer_rw_intr_mask intr_mask;
324 reg_timer_rw_trig_cfg trig_cfg = { 0 };
325 struct fast_timer *t;
326 fast_timer_function_type *f;
327 unsigned long d;
328 unsigned long flags;
329
330
331
332
333
334
335
336
337 local_irq_save(flags);
338
339
340 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
341 intr_mask.trig = 0;
342 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
343
344
345
346 trig_cfg.tmr = regk_timer_off;
347 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
348
349
350 ack_intr.trig = 1;
351 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
352
353 fast_timer_running = 0;
354 fast_timer_ints++;
355
356 t = fast_timer_list;
357 while (t) {
358 struct fasttime_t tv;
359
360
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
367#ifdef FAST_TIMER_LOG
368 timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
369#endif
370 fast_timers_expired++;
371
372
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
383
384
385
386
387
388 f = t->function;
389 d = t->data;
390
391 if (f != NULL) {
392
393
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
401 D1(printk(".\n"));
402 }
403
404 t = fast_timer_list;
405 if (t != NULL) {
406
407 long us = 0;
408 struct fasttime_t tv;
409
410 do_gettimeofday_fast(&tv);
411
412
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
428
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
441static 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
449
450void 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
460
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
468#define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
469
470static int proc_fasttimer_show(struct seq_file *m, void *v)
471{
472 unsigned long flags;
473 int i = 0;
474 int num_to_show;
475 struct fasttime_t tv;
476 struct fast_timer *t, *nextt;
477
478 do_gettimeofday_fast(&tv);
479
480 seq_printf(m, "Fast timers added: %i\n", fast_timers_added);
481 seq_printf(m, "Fast timers started: %i\n", fast_timers_started);
482 seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints);
483 seq_printf(m, "Fast timers expired: %i\n", fast_timers_expired);
484 seq_printf(m, "Fast timers deleted: %i\n", fast_timers_deleted);
485 seq_printf(m, "Fast timer running: %s\n",
486 fast_timer_running ? "yes" : "no");
487 seq_printf(m, "Current time: %lu.%06lu\n",
488 (unsigned long)tv.tv_jiff,
489 (unsigned long)tv.tv_usec);
490#ifdef FAST_TIMER_SANITY_CHECKS
491 seq_printf(m, "Sanity failed: %i\n", sanity_failed);
492#endif
493 seq_putc(m, '\n');
494
495#ifdef DEBUG_LOG_INCLUDED
496 {
497 int end_i = debug_log_cnt;
498 i = 0;
499
500 if (debug_log_cnt_wrapped)
501 i = debug_log_cnt;
502
503 while ((i != end_i || debug_log_cnt_wrapped)) {
504 seq_printf(m, debug_log_string[i], debug_log_value[i]);
505 if (seq_has_overflowed(m))
506 return 0;
507 i = (i+1) % DEBUG_LOG_MAX;
508 }
509 }
510 seq_putc(m, '\n');
511#endif
512
513 num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
514 NUM_TIMER_STATS);
515 seq_printf(m, "Timers started: %i\n", fast_timers_started);
516 for (i = 0; i < num_to_show; i++) {
517 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
518
519#if 1
520 seq_printf(m, "div: %i delay: %i\n",
521 timer_div_settings[cur],
522 timer_delay_settings[cur]);
523#endif
524#ifdef FAST_TIMER_LOG
525 t = &timer_started_log[cur];
526 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
527 t->name,
528 (unsigned long)t->tv_set.tv_jiff,
529 (unsigned long)t->tv_set.tv_usec,
530 (unsigned long)t->tv_expires.tv_jiff,
531 (unsigned long)t->tv_expires.tv_usec,
532 t->delay_us,
533 t->data);
534 if (seq_has_overflowed(m))
535 return 0;
536#endif
537 }
538 seq_putc(m, '\n');
539
540#ifdef FAST_TIMER_LOG
541 num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
542 NUM_TIMER_STATS);
543 seq_printf(m, "Timers added: %i\n", fast_timers_added);
544 for (i = 0; i < num_to_show; i++) {
545 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
546 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
547 t->name,
548 (unsigned long)t->tv_set.tv_jiff,
549 (unsigned long)t->tv_set.tv_usec,
550 (unsigned long)t->tv_expires.tv_jiff,
551 (unsigned long)t->tv_expires.tv_usec,
552 t->delay_us,
553 t->data);
554 if (seq_has_overflowed(m))
555 return 0;
556 }
557 seq_putc(m, '\n');
558
559 num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
560 NUM_TIMER_STATS);
561 seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
562 for (i = 0; i < num_to_show; i++){
563 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
564 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
565 t->name,
566 (unsigned long)t->tv_set.tv_jiff,
567 (unsigned long)t->tv_set.tv_usec,
568 (unsigned long)t->tv_expires.tv_jiff,
569 (unsigned long)t->tv_expires.tv_usec,
570 t->delay_us,
571 t->data);
572 if (seq_has_overflowed(m))
573 return 0;
574 }
575 seq_putc(m, '\n');
576#endif
577
578 seq_puts(m, "Active timers:\n");
579 local_irq_save(flags);
580 t = fast_timer_list;
581 while (t != NULL){
582 nextt = t->next;
583 local_irq_restore(flags);
584 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
585 t->name,
586 (unsigned long)t->tv_set.tv_jiff,
587 (unsigned long)t->tv_set.tv_usec,
588 (unsigned long)t->tv_expires.tv_jiff,
589 (unsigned long)t->tv_expires.tv_usec,
590 t->delay_us,
591 t->data);
592 if (seq_has_overflowed(m))
593 return 0;
594 local_irq_save(flags);
595 if (t->next != nextt)
596 printk("timer removed!\n");
597 t = nextt;
598 }
599 local_irq_restore(flags);
600 return 0;
601}
602
603static int proc_fasttimer_open(struct inode *inode, struct file *file)
604{
605 return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
606}
607
608static const struct file_operations proc_fasttimer_fops = {
609 .open = proc_fasttimer_open,
610 .read = seq_read,
611 .llseek = seq_lseek,
612 .release = single_release,
613};
614
615#endif
616
617#ifdef FAST_TIMER_TEST
618static volatile unsigned long i = 0;
619static volatile int num_test_timeout = 0;
620static struct fast_timer tr[10];
621static int exp_num[10];
622
623static struct fasttime_t tv_exp[100];
624
625static void test_timeout(unsigned long data)
626{
627 do_gettimeofday_fast(&tv_exp[data]);
628 exp_num[data] = num_test_timeout;
629
630 num_test_timeout++;
631}
632
633static void test_timeout1(unsigned long data)
634{
635 do_gettimeofday_fast(&tv_exp[data]);
636 exp_num[data] = num_test_timeout;
637 if (data < 7)
638 {
639 start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
640 i++;
641 }
642 num_test_timeout++;
643}
644
645DP(
646static char buf0[2000];
647static char buf1[2000];
648static char buf2[2000];
649static char buf3[2000];
650static char buf4[2000];
651);
652
653static char buf5[6000];
654static int j_u[1000];
655
656static void fast_timer_test(void)
657{
658 int prev_num;
659 int j;
660
661 struct fasttime_t tv, tv0, tv1, tv2;
662
663 printk("fast_timer_test() start\n");
664 do_gettimeofday_fast(&tv);
665
666 for (j = 0; j < 1000; j++)
667 {
668 j_u[j] = GET_JIFFIES_USEC();
669 }
670 for (j = 0; j < 100; j++)
671 {
672 do_gettimeofday_fast(&tv_exp[j]);
673 }
674 printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
675
676 for (j = 0; j < 1000; j++)
677 {
678 printk(KERN_DEBUG "%i %i %i %i %i\n",
679 j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
680 j += 4;
681 }
682 for (j = 0; j < 100; j++)
683 {
684 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
685 tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
686 tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
687 tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
688 tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
689 tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
690 j += 4;
691 }
692 do_gettimeofday_fast(&tv0);
693 start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
694 DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
695 i++;
696 start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
697 DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
698 i++;
699 start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
700 DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
701 i++;
702 start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
703 DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
704 i++;
705 start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
706 DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
707 i++;
708 do_gettimeofday_fast(&tv1);
709
710 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
711
712 prev_num = num_test_timeout;
713 while (num_test_timeout < i)
714 {
715 if (num_test_timeout != prev_num)
716 prev_num = num_test_timeout;
717 }
718 do_gettimeofday_fast(&tv2);
719 printk(KERN_INFO "Timers started %is %06i\n",
720 tv0.tv_jiff, tv0.tv_usec);
721 printk(KERN_INFO "Timers started at %is %06i\n",
722 tv1.tv_jiff, tv1.tv_usec);
723 printk(KERN_INFO "Timers done %is %06i\n",
724 tv2.tv_jiff, tv2.tv_usec);
725 DP(printk("buf0:\n");
726 printk(buf0);
727 printk("buf1:\n");
728 printk(buf1);
729 printk("buf2:\n");
730 printk(buf2);
731 printk("buf3:\n");
732 printk(buf3);
733 printk("buf4:\n");
734 printk(buf4);
735 );
736 printk("buf5:\n");
737 printk(buf5);
738
739 printk("timers set:\n");
740 for(j = 0; j<i; j++)
741 {
742 struct fast_timer *t = &tr[j];
743 printk("%-10s set: %6is %06ius exp: %6is %06ius "
744 "data: 0x%08X func: 0x%08X\n",
745 t->name,
746 t->tv_set.tv_jiff,
747 t->tv_set.tv_usec,
748 t->tv_expires.tv_jiff,
749 t->tv_expires.tv_usec,
750 t->data,
751 t->function
752 );
753
754 printk(" del: %6ius did exp: %6is %06ius as #%i error: %6li\n",
755 t->delay_us,
756 tv_exp[j].tv_jiff,
757 tv_exp[j].tv_usec,
758 exp_num[j],
759 (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
760 1000000 + tv_exp[j].tv_usec -
761 t->tv_expires.tv_usec);
762 }
763 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
764 printk("buf5 after all done:\n");
765 printk(buf5);
766 printk("fast_timer_test() done\n");
767}
768#endif
769
770
771int fast_timer_init(void)
772{
773
774 if (!fast_timer_is_init)
775 {
776 printk("fast_timer_init()\n");
777
778#ifdef CONFIG_PROC_FS
779 proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
780#endif
781 if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
782 IRQF_SHARED,
783 "fast timer int", &fast_timer_list))
784 printk(KERN_ERR "err: fasttimer irq\n");
785 fast_timer_is_init = 1;
786#ifdef FAST_TIMER_TEST
787 printk("do test\n");
788 fast_timer_test();
789#endif
790 }
791 return 0;
792}
793__initcall(fast_timer_init);
794