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);