Merge commit 'v2.6.27-rc8' into oprofile
[linux-2.6] / arch / cris / arch-v32 / kernel / fasttimer.c
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 */
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
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 */
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 */
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
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
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
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
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
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
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
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
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
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
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
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
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);