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TOMOYO Linux Cross Reference
Linux/arch/cris/arch-v32/kernel/fasttimer.c

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  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 
 21 #include <hwregs/reg_map.h>
 22 #include <hwregs/reg_rdwr.h>
 23 #include <hwregs/timer_defs.h>
 24 #include <asm/fasttimer.h>
 25 #include <linux/proc_fs.h>
 26 #include <linux/seq_file.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 /* This value is very much based on testing */
468 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
469 
470 static 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                         if (seq_printf(m, debug_log_string[i], debug_log_value[i]) < 0)
505                                 return 0;
506                         i = (i+1) % DEBUG_LOG_MAX;
507                 }
508         }
509         seq_putc(m, '\n');
510 #endif
511 
512         num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
513                        NUM_TIMER_STATS);
514         seq_printf(m, "Timers started: %i\n", fast_timers_started);
515         for (i = 0; i < num_to_show; i++) {
516                 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
517 
518 #if 1 //ndef FAST_TIMER_LOG
519                 seq_printf(m, "div: %i delay: %i"
520                            "\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                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
527                                "d: %6li us data: 0x%08lX"
528                                "\n",
529                                t->name,
530                                (unsigned long)t->tv_set.tv_jiff,
531                                (unsigned long)t->tv_set.tv_usec,
532                                (unsigned long)t->tv_expires.tv_jiff,
533                                (unsigned long)t->tv_expires.tv_usec,
534                                t->delay_us,
535                                t->data) < 0)
536                         return 0;
537 #endif
538         }
539         seq_putc(m, '\n');
540 
541 #ifdef FAST_TIMER_LOG
542         num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
543                        NUM_TIMER_STATS);
544         seq_printf(m, "Timers added: %i\n", fast_timers_added);
545         for (i = 0; i < num_to_show; i++) {
546                 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
547                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
548                                "d: %6li us data: 0x%08lX"
549                                "\n",
550                                t->name,
551                                (unsigned long)t->tv_set.tv_jiff,
552                                (unsigned long)t->tv_set.tv_usec,
553                                (unsigned long)t->tv_expires.tv_jiff,
554                                (unsigned long)t->tv_expires.tv_usec,
555                                t->delay_us,
556                                t->data) < 0)
557                         return 0;
558         }
559         seq_putc(m, '\n');
560 
561         num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
562                        NUM_TIMER_STATS);
563         seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
564         for (i = 0; i < num_to_show; i++){
565                 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
566                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
567                                "d: %6li us data: 0x%08lX"
568                                "\n",
569                                t->name,
570                                (unsigned long)t->tv_set.tv_jiff,
571                                (unsigned long)t->tv_set.tv_usec,
572                                (unsigned long)t->tv_expires.tv_jiff,
573                                (unsigned long)t->tv_expires.tv_usec,
574                                t->delay_us,
575                                t->data) < 0)
576                         return 0;
577         }
578         seq_putc(m, '\n');
579 #endif
580 
581         seq_puts(m, "Active timers:\n");
582         local_irq_save(flags);
583         t = fast_timer_list;
584         while (t != NULL){
585                 nextt = t->next;
586                 local_irq_restore(flags);
587                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
588                                "d: %6li us data: 0x%08lX"
589 /*                      " func: 0x%08lX" */
590                                "\n",
591                                t->name,
592                                (unsigned long)t->tv_set.tv_jiff,
593                                (unsigned long)t->tv_set.tv_usec,
594                                (unsigned long)t->tv_expires.tv_jiff,
595                                (unsigned long)t->tv_expires.tv_usec,
596                                t->delay_us,
597                                t->data
598 /*                      , t->function */
599                                ) < 0)
600                         return 0;
601                 local_irq_save(flags);
602                 if (t->next != nextt)
603                         printk("timer removed!\n");
604                 t = nextt;
605         }
606         local_irq_restore(flags);
607         return 0;
608 }
609 
610 static int proc_fasttimer_open(struct inode *inode, struct file *file)
611 {
612         return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
613 }
614 
615 static const struct file_operations proc_fasttimer_fops = {
616         .open           = proc_fasttimer_open,
617         .read           = seq_read,
618         .llseek         = seq_lseek,
619         .release        = single_release,
620 };
621 
622 #endif /* PROC_FS */
623 
624 #ifdef FAST_TIMER_TEST
625 static volatile unsigned long i = 0;
626 static volatile int num_test_timeout = 0;
627 static struct fast_timer tr[10];
628 static int exp_num[10];
629 
630 static struct fasttime_t tv_exp[100];
631 
632 static void test_timeout(unsigned long data)
633 {
634   do_gettimeofday_fast(&tv_exp[data]);
635   exp_num[data] = num_test_timeout;
636 
637   num_test_timeout++;
638 }
639 
640 static void test_timeout1(unsigned long data)
641 {
642   do_gettimeofday_fast(&tv_exp[data]);
643   exp_num[data] = num_test_timeout;
644   if (data < 7)
645   {
646     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
647     i++;
648   }
649   num_test_timeout++;
650 }
651 
652 DP(
653 static char buf0[2000];
654 static char buf1[2000];
655 static char buf2[2000];
656 static char buf3[2000];
657 static char buf4[2000];
658 );
659 
660 static char buf5[6000];
661 static int j_u[1000];
662 
663 static void fast_timer_test(void)
664 {
665   int prev_num;
666   int j;
667 
668         struct fasttime_t tv, tv0, tv1, tv2;
669 
670   printk("fast_timer_test() start\n");
671   do_gettimeofday_fast(&tv);
672 
673   for (j = 0; j < 1000; j++)
674   {
675     j_u[j] = GET_JIFFIES_USEC();
676   }
677   for (j = 0; j < 100; j++)
678   {
679     do_gettimeofday_fast(&tv_exp[j]);
680   }
681   printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
682 
683   for (j = 0; j < 1000; j++)
684   {
685     printk(KERN_DEBUG "%i %i %i %i %i\n",
686       j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
687     j += 4;
688   }
689   for (j = 0; j < 100; j++)
690   {
691     printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
692                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
693                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
694                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
695                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
696                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
697     j += 4;
698   }
699   do_gettimeofday_fast(&tv0);
700   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
701   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
702   i++;
703   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
704   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
705   i++;
706   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
707   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
708   i++;
709   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
710   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
711   i++;
712   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
713   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
714   i++;
715   do_gettimeofday_fast(&tv1);
716 
717   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
718 
719   prev_num = num_test_timeout;
720   while (num_test_timeout < i)
721   {
722     if (num_test_timeout != prev_num)
723       prev_num = num_test_timeout;
724   }
725   do_gettimeofday_fast(&tv2);
726         printk(KERN_INFO "Timers started    %is %06i\n",
727                 tv0.tv_jiff, tv0.tv_usec);
728         printk(KERN_INFO "Timers started at %is %06i\n",
729                 tv1.tv_jiff, tv1.tv_usec);
730         printk(KERN_INFO "Timers done       %is %06i\n",
731                 tv2.tv_jiff, tv2.tv_usec);
732   DP(printk("buf0:\n");
733      printk(buf0);
734      printk("buf1:\n");
735      printk(buf1);
736      printk("buf2:\n");
737      printk(buf2);
738      printk("buf3:\n");
739      printk(buf3);
740      printk("buf4:\n");
741      printk(buf4);
742   );
743   printk("buf5:\n");
744   printk(buf5);
745 
746   printk("timers set:\n");
747   for(j = 0; j<i; j++)
748   {
749     struct fast_timer *t = &tr[j];
750     printk("%-10s set: %6is %06ius exp: %6is %06ius "
751            "data: 0x%08X func: 0x%08X\n",
752            t->name,
753                         t->tv_set.tv_jiff,
754            t->tv_set.tv_usec,
755                         t->tv_expires.tv_jiff,
756            t->tv_expires.tv_usec,
757            t->data,
758            t->function
759            );
760 
761     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
762            t->delay_us,
763                         tv_exp[j].tv_jiff,
764            tv_exp[j].tv_usec,
765            exp_num[j],
766                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
767                                 1000000 + tv_exp[j].tv_usec -
768                                 t->tv_expires.tv_usec);
769   }
770   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
771   printk("buf5 after all done:\n");
772   printk(buf5);
773   printk("fast_timer_test() done\n");
774 }
775 #endif
776 
777 
778 int fast_timer_init(void)
779 {
780   /* For some reason, request_irq() hangs when called froom time_init() */
781   if (!fast_timer_is_init)
782   {
783     printk("fast_timer_init()\n");
784 
785 #ifdef CONFIG_PROC_FS
786     proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
787 #endif /* PROC_FS */
788                 if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
789                                 IRQF_SHARED | IRQF_DISABLED,
790                                 "fast timer int", &fast_timer_list))
791                         printk(KERN_ERR "err: fasttimer irq\n");
792     fast_timer_is_init = 1;
793 #ifdef FAST_TIMER_TEST
794     printk("do test\n");
795     fast_timer_test();
796 #endif
797   }
798         return 0;
799 }
800 __initcall(fast_timer_init);
801 

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