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 <linux/version.h>
  23
  24 #include <hwregs/reg_map.h>
  25 #include <hwregs/reg_rdwr.h>
  26 #include <hwregs/timer_defs.h>
  27 #include <asm/fasttimer.h>
  28 #include <linux/proc_fs.h>
  29
  30 /*
  31  * timer0 is running at 100MHz and generating jiffies timer ticks
  32  * at 100 or 1000 HZ.
  33  * fasttimer gives an API that gives timers that expire "between" the jiffies
  34  * giving microsecond resolution (10 ns).
  35  * fasttimer uses reg_timer_rw_trig register to get interrupt when
  36  * r_time reaches a certain value.
  37  */
  38
  39
  40 #define DEBUG_LOG_INCLUDED
  41 #define FAST_TIMER_LOG
  42 /* #define FAST_TIMER_TEST */
  43
  44 #define FAST_TIMER_SANITY_CHECKS
  45
  46 #ifdef FAST_TIMER_SANITY_CHECKS
  47 #define SANITYCHECK(x) x
  48 static int sanity_failed = 0;
  49 #else
  50 #define SANITYCHECK(x)
  51 #endif
  52
  53 #define D1(x)
  54 #define D2(x)
  55 #define DP(x)
  56
  57 static unsigned int fast_timer_running;
  58 static unsigned int fast_timers_added;
  59 static unsigned int fast_timers_started;
  60 static unsigned int fast_timers_expired;
  61 static unsigned int fast_timers_deleted;
  62 static unsigned int fast_timer_is_init;
  63 static unsigned int fast_timer_ints;
  64
  65 struct fast_timer *fast_timer_list = NULL;
  66
  67 #ifdef DEBUG_LOG_INCLUDED
  68 #define DEBUG_LOG_MAX 128
  69 static const char * debug_log_string[DEBUG_LOG_MAX];
  70 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  71 static unsigned int debug_log_cnt;
  72 static unsigned int debug_log_cnt_wrapped;
  73
  74 #define DEBUG_LOG(string, value) \
  75 { \
  76   unsigned long log_flags; \
  77   local_irq_save(log_flags); \
  78   debug_log_string[debug_log_cnt] = (string); \
  79   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  80   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  81   { \
  82     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  83     debug_log_cnt_wrapped = 1; \
  84   } \
  85   local_irq_restore(log_flags); \
  86 }
  87 #else
  88 #define DEBUG_LOG(string, value)
  89 #endif
  90
  91
  92 #define NUM_TIMER_STATS 16
  93 #ifdef FAST_TIMER_LOG
  94 struct fast_timer timer_added_log[NUM_TIMER_STATS];
  95 struct fast_timer timer_started_log[NUM_TIMER_STATS];
  96 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
  97 #endif
  98
  99 int timer_div_settings[NUM_TIMER_STATS];
 100 int timer_delay_settings[NUM_TIMER_STATS];
 101
 102 struct work_struct fast_work;
 103
 104 static void
 105 timer_trig_handler(struct work_struct *work);
 106
 107
 108
 109 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 110 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 111 {
 112         tv->tv_jiff = jiffies;
 113         tv->tv_usec = GET_JIFFIES_USEC();
 114 }
 115
 116 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 117 {
 118         /* Compare jiffies. Takes care of wrapping */
 119         if (time_before(t0->tv_jiff, t1->tv_jiff))
 120                 return -1;
 121         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 122                 return 1;
 123
 124         /* Compare us */
 125         if (t0->tv_usec < t1->tv_usec)
 126                 return -1;
 127         else if (t0->tv_usec > t1->tv_usec)
 128                 return 1;
 129         return 0;
 130 }
 131
 132 /* Called with ints off */
 133 inline void start_timer_trig(unsigned long delay_us)
 134 {
 135   reg_timer_rw_ack_intr ack_intr = { 0 };
 136   reg_timer_rw_intr_mask intr_mask;
 137   reg_timer_rw_trig trig;
 138   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 139         reg_timer_r_time r_time0;
 140         reg_timer_r_time r_time1;
 141         unsigned char trig_wrap;
 142         unsigned char time_wrap;
 143
 144         r_time0 = REG_RD(timer, regi_timer0, r_time);
 145
 146   D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
 147             delay_us, freq_index, div));
 148   /* Clear trig irq */
 149         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 150   intr_mask.trig = 0;
 151         REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 152
 153         /* Set timer values and check if trigger wraps. */
 154         /* r_time is 100MHz (10 ns resolution) */
 155         trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;
 156
 157   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
 158   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 159
 160   /* Ack interrupt */
 161   ack_intr.trig = 1;
 162         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 163
 164   /* Start timer */
 165         REG_WR(timer, regi_timer0, rw_trig, trig);
 166   trig_cfg.tmr = regk_timer_time;
 167         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 168
 169   /* Check if we have already passed the trig time */
 170         r_time1 = REG_RD(timer, regi_timer0, r_time);
 171         time_wrap = r_time1 < r_time0;
 172
 173         if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
 174     /* No, Enable trig irq */
 175                 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 176     intr_mask.trig = 1;
 177                 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 178     fast_timers_started++;
 179     fast_timer_running = 1;
 180         } else {
 181     /* We have passed the time, disable trig point, ack intr */
 182     trig_cfg.tmr = regk_timer_off;
 183                 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 184                 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 185                 /* call the int routine */
 186                 INIT_WORK(&fast_work, timer_trig_handler);
 187                 schedule_work(&fast_work);
 188   }
 189
 190 }
 191
 192 /* In version 1.4 this function takes 27 - 50 us */
 193 void start_one_shot_timer(struct fast_timer *t,
 194                           fast_timer_function_type *function,
 195                           unsigned long data,
 196                           unsigned long delay_us,
 197                           const char *name)
 198 {
 199   unsigned long flags;
 200   struct fast_timer *tmp;
 201
 202   D1(printk("sft %s %d us\n", name, delay_us));
 203
 204   local_irq_save(flags);
 205
 206   do_gettimeofday_fast(&t->tv_set);
 207   tmp = fast_timer_list;
 208
 209   SANITYCHECK({ /* Check so this is not in the list already... */
 210         while (tmp != NULL) {
 211                 if (tmp == t) {
 212                         printk(KERN_DEBUG
 213                                 "timer name: %s data: 0x%08lX already "
 214                                 "in list!\n", name, data);
 215                         sanity_failed++;
 216                         goto done;
 217                 } else
 218         tmp = tmp->next;
 219     }
 220     tmp = fast_timer_list;
 221   });
 222
 223   t->delay_us = delay_us;
 224   t->function = function;
 225   t->data = data;
 226   t->name = name;
 227
 228   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 229         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 230         if (t->tv_expires.tv_usec > 1000000) {
 231     t->tv_expires.tv_usec -= 1000000;
 232                 t->tv_expires.tv_jiff += HZ;
 233   }
 234 #ifdef FAST_TIMER_LOG
 235   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 236 #endif
 237   fast_timers_added++;
 238
 239   /* Check if this should timeout before anything else */
 240   if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
 241     /* Put first in list and modify the timer value */
 242     t->prev = NULL;
 243     t->next = fast_timer_list;
 244     if (fast_timer_list)
 245       fast_timer_list->prev = t;
 246     fast_timer_list = t;
 247 #ifdef FAST_TIMER_LOG
 248     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 249 #endif
 250     start_timer_trig(delay_us);
 251   } else {
 252     /* Put in correct place in list */
 253     while (tmp->next &&
 254         fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 255       tmp = tmp->next;
 256     /* Insert t after tmp */
 257     t->prev = tmp;
 258     t->next = tmp->next;
 259     if (tmp->next)
 260     {
 261       tmp->next->prev = t;
 262     }
 263     tmp->next = t;
 264   }
 265
 266   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 267
 268 done:
 269   local_irq_restore(flags);
 270 } /* start_one_shot_timer */
 271
 272 static inline int fast_timer_pending (const struct fast_timer * t)
 273 {
 274   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 275 }
 276
 277 static inline int detach_fast_timer (struct fast_timer *t)
 278 {
 279   struct fast_timer *next, *prev;
 280   if (!fast_timer_pending(t))
 281     return 0;
 282   next = t->next;
 283   prev = t->prev;
 284   if (next)
 285     next->prev = prev;
 286   if (prev)
 287     prev->next = next;
 288   else
 289     fast_timer_list = next;
 290   fast_timers_deleted++;
 291   return 1;
 292 }
 293
 294 int del_fast_timer(struct fast_timer * t)
 295 {
 296   unsigned long flags;
 297   int ret;
 298
 299   local_irq_save(flags);
 300   ret = detach_fast_timer(t);
 301   t->next = t->prev = NULL;
 302   local_irq_restore(flags);
 303   return ret;
 304 } /* del_fast_timer */
 305
 306
 307 /* Interrupt routines or functions called in interrupt context */
 308
 309 /* Timer interrupt handler for trig interrupts */
 310
 311 static irqreturn_t
 312 timer_trig_interrupt(int irq, void *dev_id)
 313 {
 314   reg_timer_r_masked_intr masked_intr;
 315   /* Check if the timer interrupt is for us (a trig int) */
 316         masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
 317   if (!masked_intr.trig)
 318     return IRQ_NONE;
 319         timer_trig_handler(NULL);
 320   return IRQ_HANDLED;
 321 }
 322
 323 static void timer_trig_handler(struct work_struct *work)
 324 {
 325   reg_timer_rw_ack_intr ack_intr = { 0 };
 326   reg_timer_rw_intr_mask intr_mask;
 327   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 328   struct fast_timer *t;
 329   unsigned long flags;
 330
 331         /* We keep interrupts disabled not only when we modify the
 332          * fast timer list, but any time we hold a reference to a
 333          * timer in the list, since del_fast_timer may be called
 334          * from (another) interrupt context.  Thus, the only time
 335          * when interrupts are enabled is when calling the timer
 336          * callback function.
 337          */
 338   local_irq_save(flags);
 339
 340   /* Clear timer trig interrupt */
 341         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 342   intr_mask.trig = 0;
 343   REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 344
 345   /* First stop timer, then ack interrupt */
 346   /* Stop timer */
 347   trig_cfg.tmr = regk_timer_off;
 348         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 349
 350   /* Ack interrupt */
 351   ack_intr.trig = 1;
 352         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 353
 354   fast_timer_running = 0;
 355   fast_timer_ints++;
 356
 357         fast_timer_function_type *f;
 358         unsigned long d;
 359
 360   t = fast_timer_list;
 361         while (t) {
 362                 struct fasttime_t tv;
 363
 364     /* Has it really expired? */
 365     do_gettimeofday_fast(&tv);
 366                 D1(printk(KERN_DEBUG
 367                         "t: %is %06ius\n", tv.tv_jiff, tv.tv_usec));
 368
 369                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0) {
 370       /* Yes it has expired */
 371 #ifdef FAST_TIMER_LOG
 372       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 373 #endif
 374       fast_timers_expired++;
 375
 376       /* Remove this timer before call, since it may reuse the timer */
 377       if (t->prev)
 378         t->prev->next = t->next;
 379       else
 380         fast_timer_list = t->next;
 381       if (t->next)
 382         t->next->prev = t->prev;
 383       t->prev = NULL;
 384       t->next = NULL;
 385
 386                         /* Save function callback data before enabling
 387                          * interrupts, since the timer may be removed and we
 388                          * don't know how it was allocated (e.g. ->function
 389                          * and ->data may become overwritten after deletion
 390                          * if the timer was stack-allocated).
 391                          */
 392                         f = t->function;
 393                         d = t->data;
 394
 395                         if (f != NULL) {
 396                                 /* Run the callback function with interrupts
 397                                  * enabled. */
 398                                 local_irq_restore(flags);
 399                                 f(d);
 400                                 local_irq_save(flags);
 401                         } else
 402         DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
 403                 } else {
 404       /* Timer is to early, let's set it again using the normal routines */
 405       D1(printk(".\n"));
 406     }
 407
 408                 t = fast_timer_list;
 409                 if (t != NULL) {
 410       /* Start next timer.. */
 411                         long us = 0;
 412                         struct fasttime_t tv;
 413
 414       do_gettimeofday_fast(&tv);
 415
 416                         /* time_after_eq takes care of wrapping */
 417                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 418                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 419                                         1000000 / HZ + t->tv_expires.tv_usec -
 420                                         tv.tv_usec);
 421
 422                         if (us > 0) {
 423                                 if (!fast_timer_running) {
 424 #ifdef FAST_TIMER_LOG
 425           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 426 #endif
 427           start_timer_trig(us);
 428         }
 429         break;
 430                         } else {
 431         /* Timer already expired, let's handle it better late than never.
 432          * The normal loop handles it
 433          */
 434         D1(printk("e! %d\n", us));
 435       }
 436     }
 437   }
 438
 439         local_irq_restore(flags);
 440
 441         if (!t)
 442     D1(printk("ttrig stop!\n"));
 443 }
 444
 445 static void wake_up_func(unsigned long data)
 446 {
 447   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 448   wake_up(sleep_wait_p);
 449 }
 450
 451
 452 /* Useful API */
 453
 454 void schedule_usleep(unsigned long us)
 455 {
 456   struct fast_timer t;
 457   wait_queue_head_t sleep_wait;
 458   init_waitqueue_head(&sleep_wait);
 459
 460   D1(printk("schedule_usleep(%d)\n", us));
 461   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 462                        "usleep");
 463         /* Uninterruptible sleep on the fast timer. (The condition is
 464          * somewhat redundant since the timer is what wakes us up.) */
 465         wait_event(sleep_wait, !fast_timer_pending(&t));
 466
 467   D1(printk("done schedule_usleep(%d)\n", us));
 468 }
 469
 470 #ifdef CONFIG_PROC_FS
 471 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 472                        ,int *eof, void *data_unused);
 473 static struct proc_dir_entry *fasttimer_proc_entry;
 474 #endif /* CONFIG_PROC_FS */
 475
 476 #ifdef CONFIG_PROC_FS
 477
 478 /* This value is very much based on testing */
 479 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 480
 481 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 482                        ,int *eof, void *data_unused)
 483 {
 484   unsigned long flags;
 485   int i = 0;
 486   int num_to_show;
 487         struct fasttime_t tv;
 488   struct fast_timer *t, *nextt;
 489   static char *bigbuf = NULL;
 490   static unsigned long used;
 491
 492         if (!bigbuf) {
 493                 bigbuf = vmalloc(BIG_BUF_SIZE);
 494                 if (!bigbuf) {
 495                         used = 0;
 496                         if (buf)
 497                                 buf[0] = '\0';
 498                         return 0;
 499                 }
 500         }
 501
 502         if (!offset || !used) {
 503     do_gettimeofday_fast(&tv);
 504
 505     used = 0;
 506     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 507                     fast_timers_added);
 508     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 509                     fast_timers_started);
 510     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 511                     fast_timer_ints);
 512     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 513                     fast_timers_expired);
 514     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 515                     fast_timers_deleted);
 516     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 517                     fast_timer_running ? "yes" : "no");
 518     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 519                         (unsigned long)tv.tv_jiff,
 520                     (unsigned long)tv.tv_usec);
 521 #ifdef FAST_TIMER_SANITY_CHECKS
 522     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 523                     sanity_failed);
 524 #endif
 525     used += sprintf(bigbuf + used, "\n");
 526
 527 #ifdef DEBUG_LOG_INCLUDED
 528     {
 529       int end_i = debug_log_cnt;
 530       i = 0;
 531
 532                         if (debug_log_cnt_wrapped)
 533         i = debug_log_cnt;
 534
 535       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 536              used+100 < BIG_BUF_SIZE)
 537       {
 538         used += sprintf(bigbuf + used, debug_log_string[i],
 539                         debug_log_value[i]);
 540         i = (i+1) % DEBUG_LOG_MAX;
 541       }
 542     }
 543     used += sprintf(bigbuf + used, "\n");
 544 #endif
 545
 546     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 547                    NUM_TIMER_STATS);
 548     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 549     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 550     {
 551       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 552
 553 #if 1 //ndef FAST_TIMER_LOG
 554       used += sprintf(bigbuf + used, "div: %i delay: %i"
 555                       "\n",
 556                       timer_div_settings[cur],
 557                       timer_delay_settings[cur]
 558                       );
 559 #endif
 560 #ifdef FAST_TIMER_LOG
 561       t = &timer_started_log[cur];
 562       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 563                       "d: %6li us data: 0x%08lX"
 564                       "\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                       );
 573 #endif
 574     }
 575     used += sprintf(bigbuf + used, "\n");
 576
 577 #ifdef FAST_TIMER_LOG
 578     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 579                    NUM_TIMER_STATS);
 580     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 581     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 582     {
 583       t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 584       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 585                       "d: %6li us data: 0x%08lX"
 586                       "\n",
 587                       t->name,
 588                                 (unsigned long)t->tv_set.tv_jiff,
 589                       (unsigned long)t->tv_set.tv_usec,
 590                                 (unsigned long)t->tv_expires.tv_jiff,
 591                       (unsigned long)t->tv_expires.tv_usec,
 592                       t->delay_us,
 593                       t->data
 594                       );
 595     }
 596     used += sprintf(bigbuf + used, "\n");
 597
 598     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 599                    NUM_TIMER_STATS);
 600     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 601     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 602     {
 603       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 604       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 605                       "d: %6li us data: 0x%08lX"
 606                       "\n",
 607                       t->name,
 608                                 (unsigned long)t->tv_set.tv_jiff,
 609                       (unsigned long)t->tv_set.tv_usec,
 610                                 (unsigned long)t->tv_expires.tv_jiff,
 611                       (unsigned long)t->tv_expires.tv_usec,
 612                       t->delay_us,
 613                       t->data
 614                       );
 615     }
 616     used += sprintf(bigbuf + used, "\n");
 617 #endif
 618
 619     used += sprintf(bigbuf + used, "Active timers:\n");
 620     local_irq_save(flags);
 621     t = fast_timer_list;
 622     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 623     {
 624       nextt = t->next;
 625       local_irq_restore(flags);
 626       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 627                         "d: %6li us data: 0x%08lX"
 628 /*                      " func: 0x%08lX" */
 629                         "\n",
 630                         t->name,
 631                         (unsigned long)t->tv_set.tv_jiff,
 632                         (unsigned long)t->tv_set.tv_usec,
 633                         (unsigned long)t->tv_expires.tv_jiff,
 634                         (unsigned long)t->tv_expires.tv_usec,
 635                       t->delay_us,
 636                       t->data
 637 /*                      , t->function */
 638                       );
 639                         local_irq_save(flags);
 640       if (t->next != nextt)
 641       {
 642         printk("timer removed!\n");
 643       }
 644       t = nextt;
 645     }
 646     local_irq_restore(flags);
 647   }
 648
 649   if (used - offset < len)
 650   {
 651     len = used - offset;
 652   }
 653
 654   memcpy(buf, bigbuf + offset, len);
 655   *start = buf;
 656   *eof = 1;
 657
 658   return len;
 659 }
 660 #endif /* PROC_FS */
 661
 662 #ifdef FAST_TIMER_TEST
 663 static volatile unsigned long i = 0;
 664 static volatile int num_test_timeout = 0;
 665 static struct fast_timer tr[10];
 666 static int exp_num[10];
 667
 668 static struct fasttime_t tv_exp[100];
 669
 670 static void test_timeout(unsigned long data)
 671 {
 672   do_gettimeofday_fast(&tv_exp[data]);
 673   exp_num[data] = num_test_timeout;
 674
 675   num_test_timeout++;
 676 }
 677
 678 static void test_timeout1(unsigned long data)
 679 {
 680   do_gettimeofday_fast(&tv_exp[data]);
 681   exp_num[data] = num_test_timeout;
 682   if (data < 7)
 683   {
 684     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 685     i++;
 686   }
 687   num_test_timeout++;
 688 }
 689
 690 DP(
 691 static char buf0[2000];
 692 static char buf1[2000];
 693 static char buf2[2000];
 694 static char buf3[2000];
 695 static char buf4[2000];
 696 );
 697
 698 static char buf5[6000];
 699 static int j_u[1000];
 700
 701 static void fast_timer_test(void)
 702 {
 703   int prev_num;
 704   int j;
 705
 706         struct fasttime_t tv, tv0, tv1, tv2;
 707
 708   printk("fast_timer_test() start\n");
 709   do_gettimeofday_fast(&tv);
 710
 711   for (j = 0; j < 1000; j++)
 712   {
 713     j_u[j] = GET_JIFFIES_USEC();
 714   }
 715   for (j = 0; j < 100; j++)
 716   {
 717     do_gettimeofday_fast(&tv_exp[j]);
 718   }
 719   printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
 720
 721   for (j = 0; j < 1000; j++)
 722   {
 723     printk(KERN_DEBUG "%i %i %i %i %i\n",
 724       j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
 725     j += 4;
 726   }
 727   for (j = 0; j < 100; j++)
 728   {
 729     printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 730                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 731                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 732                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 733                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 734                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 735     j += 4;
 736   }
 737   do_gettimeofday_fast(&tv0);
 738   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 739   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 740   i++;
 741   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 742   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 743   i++;
 744   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 745   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 746   i++;
 747   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 748   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 749   i++;
 750   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 751   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 752   i++;
 753   do_gettimeofday_fast(&tv1);
 754
 755   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 756
 757   prev_num = num_test_timeout;
 758   while (num_test_timeout < i)
 759   {
 760     if (num_test_timeout != prev_num)
 761       prev_num = num_test_timeout;
 762   }
 763   do_gettimeofday_fast(&tv2);
 764         printk(KERN_INFO "Timers started    %is %06i\n",
 765                 tv0.tv_jiff, tv0.tv_usec);
 766         printk(KERN_INFO "Timers started at %is %06i\n",
 767                 tv1.tv_jiff, tv1.tv_usec);
 768         printk(KERN_INFO "Timers done       %is %06i\n",
 769                 tv2.tv_jiff, tv2.tv_usec);
 770   DP(printk("buf0:\n");
 771      printk(buf0);
 772      printk("buf1:\n");
 773      printk(buf1);
 774      printk("buf2:\n");
 775      printk(buf2);
 776      printk("buf3:\n");
 777      printk(buf3);
 778      printk("buf4:\n");
 779      printk(buf4);
 780   );
 781   printk("buf5:\n");
 782   printk(buf5);
 783
 784   printk("timers set:\n");
 785   for(j = 0; j<i; j++)
 786   {
 787     struct fast_timer *t = &tr[j];
 788     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 789            "data: 0x%08X func: 0x%08X\n",
 790            t->name,
 791                         t->tv_set.tv_jiff,
 792            t->tv_set.tv_usec,
 793                         t->tv_expires.tv_jiff,
 794            t->tv_expires.tv_usec,
 795            t->data,
 796            t->function
 797            );
 798
 799     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 800            t->delay_us,
 801                         tv_exp[j].tv_jiff,
 802            tv_exp[j].tv_usec,
 803            exp_num[j],
 804                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 805                                 1000000 + tv_exp[j].tv_usec -
 806                                 t->tv_expires.tv_usec);
 807   }
 808   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 809   printk("buf5 after all done:\n");
 810   printk(buf5);
 811   printk("fast_timer_test() done\n");
 812 }
 813 #endif
 814
 815
 816 int fast_timer_init(void)
 817 {
 818   /* For some reason, request_irq() hangs when called froom time_init() */
 819   if (!fast_timer_is_init)
 820   {
 821     printk("fast_timer_init()\n");
 822
 823 #ifdef CONFIG_PROC_FS
 824     fasttimer_proc_entry = create_proc_entry("fasttimer", 0, 0);
 825     if (fasttimer_proc_entry)
 826       fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 827 #endif /* PROC_FS */
 828                 if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
 829                                 IRQF_SHARED | IRQF_DISABLED,
 830                                 "fast timer int", &fast_timer_list))
 831                         printk(KERN_ERR "err: fasttimer irq\n");
 832     fast_timer_is_init = 1;
 833 #ifdef FAST_TIMER_TEST
 834     printk("do test\n");
 835     fast_timer_test();
 836 #endif
 837   }
 838         return 0;
 839 }
 840 __initcall(fast_timer_init);