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 static int sanity_failed;
  48 #endif
  49
  50 #define D1(x)
  51 #define D2(x)
  52 #define DP(x)
  53
  54 static unsigned int fast_timer_running;
  55 static unsigned int fast_timers_added;
  56 static unsigned int fast_timers_started;
  57 static unsigned int fast_timers_expired;
  58 static unsigned int fast_timers_deleted;
  59 static unsigned int fast_timer_is_init;
  60 static unsigned int fast_timer_ints;
  61
  62 struct fast_timer *fast_timer_list = NULL;
  63
  64 #ifdef DEBUG_LOG_INCLUDED
  65 #define DEBUG_LOG_MAX 128
  66 static const char * debug_log_string[DEBUG_LOG_MAX];
  67 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  68 static unsigned int debug_log_cnt;
  69 static unsigned int debug_log_cnt_wrapped;
  70
  71 #define DEBUG_LOG(string, value) \
  72 { \
  73   unsigned long log_flags; \
  74   local_irq_save(log_flags); \
  75   debug_log_string[debug_log_cnt] = (string); \
  76   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  77   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  78   { \
  79     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  80     debug_log_cnt_wrapped = 1; \
  81   } \
  82   local_irq_restore(log_flags); \
  83 }
  84 #else
  85 #define DEBUG_LOG(string, value)
  86 #endif
  87
  88
  89 #define NUM_TIMER_STATS 16
  90 #ifdef FAST_TIMER_LOG
  91 struct fast_timer timer_added_log[NUM_TIMER_STATS];
  92 struct fast_timer timer_started_log[NUM_TIMER_STATS];
  93 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
  94 #endif
  95
  96 int timer_div_settings[NUM_TIMER_STATS];
  97 int timer_delay_settings[NUM_TIMER_STATS];
  98
  99 struct work_struct fast_work;
 100
 101 static void
 102 timer_trig_handler(struct work_struct *work);
 103
 104
 105
 106 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 107 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 108 {
 109         tv->tv_jiff = jiffies;
 110         tv->tv_usec = GET_JIFFIES_USEC();
 111 }
 112
 113 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 114 {
 115         /* Compare jiffies. Takes care of wrapping */
 116         if (time_before(t0->tv_jiff, t1->tv_jiff))
 117                 return -1;
 118         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 119                 return 1;
 120
 121         /* Compare us */
 122         if (t0->tv_usec < t1->tv_usec)
 123                 return -1;
 124         else if (t0->tv_usec > t1->tv_usec)
 125                 return 1;
 126         return 0;
 127 }
 128
 129 /* Called with ints off */
 130 inline void start_timer_trig(unsigned long delay_us)
 131 {
 132   reg_timer_rw_ack_intr ack_intr = { 0 };
 133   reg_timer_rw_intr_mask intr_mask;
 134   reg_timer_rw_trig trig;
 135   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 136         reg_timer_r_time r_time0;
 137         reg_timer_r_time r_time1;
 138         unsigned char trig_wrap;
 139         unsigned char time_wrap;
 140
 141         r_time0 = REG_RD(timer, regi_timer0, r_time);
 142
 143   D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
 144             delay_us, freq_index, div));
 145   /* Clear trig irq */
 146         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 147   intr_mask.trig = 0;
 148         REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 149
 150         /* Set timer values and check if trigger wraps. */
 151         /* r_time is 100MHz (10 ns resolution) */
 152         trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;
 153
 154   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
 155   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 156
 157   /* Ack interrupt */
 158   ack_intr.trig = 1;
 159         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 160
 161   /* Start timer */
 162         REG_WR(timer, regi_timer0, rw_trig, trig);
 163   trig_cfg.tmr = regk_timer_time;
 164         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 165
 166   /* Check if we have already passed the trig time */
 167         r_time1 = REG_RD(timer, regi_timer0, r_time);
 168         time_wrap = r_time1 < r_time0;
 169
 170         if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
 171     /* No, Enable trig irq */
 172                 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 173     intr_mask.trig = 1;
 174                 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 175     fast_timers_started++;
 176     fast_timer_running = 1;
 177         } else {
 178     /* We have passed the time, disable trig point, ack intr */
 179     trig_cfg.tmr = regk_timer_off;
 180                 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 181                 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 182                 /* call the int routine */
 183                 INIT_WORK(&fast_work, timer_trig_handler);
 184                 schedule_work(&fast_work);
 185   }
 186
 187 }
 188
 189 /* In version 1.4 this function takes 27 - 50 us */
 190 void start_one_shot_timer(struct fast_timer *t,
 191                           fast_timer_function_type *function,
 192                           unsigned long data,
 193                           unsigned long delay_us,
 194                           const char *name)
 195 {
 196   unsigned long flags;
 197   struct fast_timer *tmp;
 198
 199   D1(printk("sft %s %d us\n", name, delay_us));
 200
 201   local_irq_save(flags);
 202
 203   do_gettimeofday_fast(&t->tv_set);
 204   tmp = fast_timer_list;
 205
 206 #ifdef FAST_TIMER_SANITY_CHECKS
 207         /* Check so this is not in the list already... */
 208         while (tmp != NULL) {
 209                 if (tmp == t) {
 210                         printk(KERN_DEBUG
 211                                 "timer name: %s data: 0x%08lX already "
 212                                 "in list!\n", name, data);
 213                         sanity_failed++;
 214                         goto done;
 215                 } else
 216                         tmp = tmp->next;
 217         }
 218         tmp = fast_timer_list;
 219 #endif
 220
 221   t->delay_us = delay_us;
 222   t->function = function;
 223   t->data = data;
 224   t->name = name;
 225
 226   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 227         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 228         if (t->tv_expires.tv_usec > 1000000) {
 229     t->tv_expires.tv_usec -= 1000000;
 230                 t->tv_expires.tv_jiff += HZ;
 231   }
 232 #ifdef FAST_TIMER_LOG
 233   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 234 #endif
 235   fast_timers_added++;
 236
 237   /* Check if this should timeout before anything else */
 238   if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
 239     /* Put first in list and modify the timer value */
 240     t->prev = NULL;
 241     t->next = fast_timer_list;
 242     if (fast_timer_list)
 243       fast_timer_list->prev = t;
 244     fast_timer_list = t;
 245 #ifdef FAST_TIMER_LOG
 246     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 247 #endif
 248     start_timer_trig(delay_us);
 249   } else {
 250     /* Put in correct place in list */
 251     while (tmp->next &&
 252         fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 253       tmp = tmp->next;
 254     /* Insert t after tmp */
 255     t->prev = tmp;
 256     t->next = tmp->next;
 257     if (tmp->next)
 258     {
 259       tmp->next->prev = t;
 260     }
 261     tmp->next = t;
 262   }
 263
 264   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 265
 266 done:
 267   local_irq_restore(flags);
 268 } /* start_one_shot_timer */
 269
 270 static inline int fast_timer_pending (const struct fast_timer * t)
 271 {
 272   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 273 }
 274
 275 static inline int detach_fast_timer (struct fast_timer *t)
 276 {
 277   struct fast_timer *next, *prev;
 278   if (!fast_timer_pending(t))
 279     return 0;
 280   next = t->next;
 281   prev = t->prev;
 282   if (next)
 283     next->prev = prev;
 284   if (prev)
 285     prev->next = next;
 286   else
 287     fast_timer_list = next;
 288   fast_timers_deleted++;
 289   return 1;
 290 }
 291
 292 int del_fast_timer(struct fast_timer * t)
 293 {
 294   unsigned long flags;
 295   int ret;
 296
 297   local_irq_save(flags);
 298   ret = detach_fast_timer(t);
 299   t->next = t->prev = NULL;
 300   local_irq_restore(flags);
 301   return ret;
 302 } /* del_fast_timer */
 303
 304
 305 /* Interrupt routines or functions called in interrupt context */
 306
 307 /* Timer interrupt handler for trig interrupts */
 308
 309 static irqreturn_t
 310 timer_trig_interrupt(int irq, void *dev_id)
 311 {
 312   reg_timer_r_masked_intr masked_intr;
 313   /* Check if the timer interrupt is for us (a trig int) */
 314         masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
 315   if (!masked_intr.trig)
 316     return IRQ_NONE;
 317         timer_trig_handler(NULL);
 318   return IRQ_HANDLED;
 319 }
 320
 321 static void timer_trig_handler(struct work_struct *work)
 322 {
 323   reg_timer_rw_ack_intr ack_intr = { 0 };
 324   reg_timer_rw_intr_mask intr_mask;
 325   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 326   struct fast_timer *t;
 327   unsigned long flags;
 328
 329         /* We keep interrupts disabled not only when we modify the
 330          * fast timer list, but any time we hold a reference to a
 331          * timer in the list, since del_fast_timer may be called
 332          * from (another) interrupt context.  Thus, the only time
 333          * when interrupts are enabled is when calling the timer
 334          * callback function.
 335          */
 336   local_irq_save(flags);
 337
 338   /* Clear timer trig interrupt */
 339         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 340   intr_mask.trig = 0;
 341   REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 342
 343   /* First stop timer, then ack interrupt */
 344   /* Stop timer */
 345   trig_cfg.tmr = regk_timer_off;
 346         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 347
 348   /* Ack interrupt */
 349   ack_intr.trig = 1;
 350         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 351
 352   fast_timer_running = 0;
 353   fast_timer_ints++;
 354
 355         fast_timer_function_type *f;
 356         unsigned long d;
 357
 358   t = fast_timer_list;
 359         while (t) {
 360                 struct fasttime_t tv;
 361
 362     /* Has it really expired? */
 363     do_gettimeofday_fast(&tv);
 364                 D1(printk(KERN_DEBUG
 365                         "t: %is %06ius\n", tv.tv_jiff, tv.tv_usec));
 366
 367                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0) {
 368       /* Yes it has expired */
 369 #ifdef FAST_TIMER_LOG
 370       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 371 #endif
 372       fast_timers_expired++;
 373
 374       /* Remove this timer before call, since it may reuse the timer */
 375       if (t->prev)
 376         t->prev->next = t->next;
 377       else
 378         fast_timer_list = t->next;
 379       if (t->next)
 380         t->next->prev = t->prev;
 381       t->prev = NULL;
 382       t->next = NULL;
 383
 384                         /* Save function callback data before enabling
 385                          * interrupts, since the timer may be removed and we
 386                          * don't know how it was allocated (e.g. ->function
 387                          * and ->data may become overwritten after deletion
 388                          * if the timer was stack-allocated).
 389                          */
 390                         f = t->function;
 391                         d = t->data;
 392
 393                         if (f != NULL) {
 394                                 /* Run the callback function with interrupts
 395                                  * enabled. */
 396                                 local_irq_restore(flags);
 397                                 f(d);
 398                                 local_irq_save(flags);
 399                         } else
 400         DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
 401                 } else {
 402       /* Timer is to early, let's set it again using the normal routines */
 403       D1(printk(".\n"));
 404     }
 405
 406                 t = fast_timer_list;
 407                 if (t != NULL) {
 408       /* Start next timer.. */
 409                         long us = 0;
 410                         struct fasttime_t tv;
 411
 412       do_gettimeofday_fast(&tv);
 413
 414                         /* time_after_eq takes care of wrapping */
 415                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 416                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 417                                         1000000 / HZ + t->tv_expires.tv_usec -
 418                                         tv.tv_usec);
 419
 420                         if (us > 0) {
 421                                 if (!fast_timer_running) {
 422 #ifdef FAST_TIMER_LOG
 423           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 424 #endif
 425           start_timer_trig(us);
 426         }
 427         break;
 428                         } else {
 429         /* Timer already expired, let's handle it better late than never.
 430          * The normal loop handles it
 431          */
 432         D1(printk("e! %d\n", us));
 433       }
 434     }
 435   }
 436
 437         local_irq_restore(flags);
 438
 439         if (!t)
 440     D1(printk("ttrig stop!\n"));
 441 }
 442
 443 static void wake_up_func(unsigned long data)
 444 {
 445   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 446   wake_up(sleep_wait_p);
 447 }
 448
 449
 450 /* Useful API */
 451
 452 void schedule_usleep(unsigned long us)
 453 {
 454   struct fast_timer t;
 455   wait_queue_head_t sleep_wait;
 456   init_waitqueue_head(&sleep_wait);
 457
 458   D1(printk("schedule_usleep(%d)\n", us));
 459   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 460                        "usleep");
 461         /* Uninterruptible sleep on the fast timer. (The condition is
 462          * somewhat redundant since the timer is what wakes us up.) */
 463         wait_event(sleep_wait, !fast_timer_pending(&t));
 464
 465   D1(printk("done schedule_usleep(%d)\n", us));
 466 }
 467
 468 #ifdef CONFIG_PROC_FS
 469 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 470                        ,int *eof, void *data_unused);
 471 static struct proc_dir_entry *fasttimer_proc_entry;
 472 #endif /* CONFIG_PROC_FS */
 473
 474 #ifdef CONFIG_PROC_FS
 475
 476 /* This value is very much based on testing */
 477 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 478
 479 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 480                        ,int *eof, void *data_unused)
 481 {
 482   unsigned long flags;
 483   int i = 0;
 484   int num_to_show;
 485         struct fasttime_t tv;
 486   struct fast_timer *t, *nextt;
 487   static char *bigbuf = NULL;
 488   static unsigned long used;
 489
 490         if (!bigbuf) {
 491                 bigbuf = vmalloc(BIG_BUF_SIZE);
 492                 if (!bigbuf) {
 493                         used = 0;
 494                         if (buf)
 495                                 buf[0] = '\0';
 496                         return 0;
 497                 }
 498         }
 499
 500         if (!offset || !used) {
 501     do_gettimeofday_fast(&tv);
 502
 503     used = 0;
 504     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 505                     fast_timers_added);
 506     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 507                     fast_timers_started);
 508     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 509                     fast_timer_ints);
 510     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 511                     fast_timers_expired);
 512     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 513                     fast_timers_deleted);
 514     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 515                     fast_timer_running ? "yes" : "no");
 516     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 517                         (unsigned long)tv.tv_jiff,
 518                     (unsigned long)tv.tv_usec);
 519 #ifdef FAST_TIMER_SANITY_CHECKS
 520     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 521                     sanity_failed);
 522 #endif
 523     used += sprintf(bigbuf + used, "\n");
 524
 525 #ifdef DEBUG_LOG_INCLUDED
 526     {
 527       int end_i = debug_log_cnt;
 528       i = 0;
 529
 530                         if (debug_log_cnt_wrapped)
 531         i = debug_log_cnt;
 532
 533       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 534              used+100 < BIG_BUF_SIZE)
 535       {
 536         used += sprintf(bigbuf + used, debug_log_string[i],
 537                         debug_log_value[i]);
 538         i = (i+1) % DEBUG_LOG_MAX;
 539       }
 540     }
 541     used += sprintf(bigbuf + used, "\n");
 542 #endif
 543
 544     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 545                    NUM_TIMER_STATS);
 546     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 547     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 548     {
 549       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 550
 551 #if 1 //ndef FAST_TIMER_LOG
 552       used += sprintf(bigbuf + used, "div: %i delay: %i"
 553                       "\n",
 554                       timer_div_settings[cur],
 555                       timer_delay_settings[cur]
 556                       );
 557 #endif
 558 #ifdef FAST_TIMER_LOG
 559       t = &timer_started_log[cur];
 560       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 561                       "d: %6li us data: 0x%08lX"
 562                       "\n",
 563                       t->name,
 564                                 (unsigned long)t->tv_set.tv_jiff,
 565                       (unsigned long)t->tv_set.tv_usec,
 566                                 (unsigned long)t->tv_expires.tv_jiff,
 567                       (unsigned long)t->tv_expires.tv_usec,
 568                       t->delay_us,
 569                       t->data
 570                       );
 571 #endif
 572     }
 573     used += sprintf(bigbuf + used, "\n");
 574
 575 #ifdef FAST_TIMER_LOG
 576     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 577                    NUM_TIMER_STATS);
 578     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 579     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 580     {
 581       t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 582       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 583                       "d: %6li us data: 0x%08lX"
 584                       "\n",
 585                       t->name,
 586                                 (unsigned long)t->tv_set.tv_jiff,
 587                       (unsigned long)t->tv_set.tv_usec,
 588                                 (unsigned long)t->tv_expires.tv_jiff,
 589                       (unsigned long)t->tv_expires.tv_usec,
 590                       t->delay_us,
 591                       t->data
 592                       );
 593     }
 594     used += sprintf(bigbuf + used, "\n");
 595
 596     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 597                    NUM_TIMER_STATS);
 598     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 599     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 600     {
 601       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 602       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 603                       "d: %6li us data: 0x%08lX"
 604                       "\n",
 605                       t->name,
 606                                 (unsigned long)t->tv_set.tv_jiff,
 607                       (unsigned long)t->tv_set.tv_usec,
 608                                 (unsigned long)t->tv_expires.tv_jiff,
 609                       (unsigned long)t->tv_expires.tv_usec,
 610                       t->delay_us,
 611                       t->data
 612                       );
 613     }
 614     used += sprintf(bigbuf + used, "\n");
 615 #endif
 616
 617     used += sprintf(bigbuf + used, "Active timers:\n");
 618     local_irq_save(flags);
 619     t = fast_timer_list;
 620     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 621     {
 622       nextt = t->next;
 623       local_irq_restore(flags);
 624       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 625                         "d: %6li us data: 0x%08lX"
 626 /*                      " func: 0x%08lX" */
 627                         "\n",
 628                         t->name,
 629                         (unsigned long)t->tv_set.tv_jiff,
 630                         (unsigned long)t->tv_set.tv_usec,
 631                         (unsigned long)t->tv_expires.tv_jiff,
 632                         (unsigned long)t->tv_expires.tv_usec,
 633                       t->delay_us,
 634                       t->data
 635 /*                      , t->function */
 636                       );
 637                         local_irq_save(flags);
 638       if (t->next != nextt)
 639       {
 640         printk("timer removed!\n");
 641       }
 642       t = nextt;
 643     }
 644     local_irq_restore(flags);
 645   }
 646
 647   if (used - offset < len)
 648   {
 649     len = used - offset;
 650   }
 651
 652   memcpy(buf, bigbuf + offset, len);
 653   *start = buf;
 654   *eof = 1;
 655
 656   return len;
 657 }
 658 #endif /* PROC_FS */
 659
 660 #ifdef FAST_TIMER_TEST
 661 static volatile unsigned long i = 0;
 662 static volatile int num_test_timeout = 0;
 663 static struct fast_timer tr[10];
 664 static int exp_num[10];
 665
 666 static struct fasttime_t tv_exp[100];
 667
 668 static void test_timeout(unsigned long data)
 669 {
 670   do_gettimeofday_fast(&tv_exp[data]);
 671   exp_num[data] = num_test_timeout;
 672
 673   num_test_timeout++;
 674 }
 675
 676 static void test_timeout1(unsigned long data)
 677 {
 678   do_gettimeofday_fast(&tv_exp[data]);
 679   exp_num[data] = num_test_timeout;
 680   if (data < 7)
 681   {
 682     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 683     i++;
 684   }
 685   num_test_timeout++;
 686 }
 687
 688 DP(
 689 static char buf0[2000];
 690 static char buf1[2000];
 691 static char buf2[2000];
 692 static char buf3[2000];
 693 static char buf4[2000];
 694 );
 695
 696 static char buf5[6000];
 697 static int j_u[1000];
 698
 699 static void fast_timer_test(void)
 700 {
 701   int prev_num;
 702   int j;
 703
 704         struct fasttime_t tv, tv0, tv1, tv2;
 705
 706   printk("fast_timer_test() start\n");
 707   do_gettimeofday_fast(&tv);
 708
 709   for (j = 0; j < 1000; j++)
 710   {
 711     j_u[j] = GET_JIFFIES_USEC();
 712   }
 713   for (j = 0; j < 100; j++)
 714   {
 715     do_gettimeofday_fast(&tv_exp[j]);
 716   }
 717   printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
 718
 719   for (j = 0; j < 1000; j++)
 720   {
 721     printk(KERN_DEBUG "%i %i %i %i %i\n",
 722       j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
 723     j += 4;
 724   }
 725   for (j = 0; j < 100; j++)
 726   {
 727     printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 728                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 729                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 730                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 731                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 732                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 733     j += 4;
 734   }
 735   do_gettimeofday_fast(&tv0);
 736   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 737   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 738   i++;
 739   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 740   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 741   i++;
 742   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 743   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 744   i++;
 745   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 746   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 747   i++;
 748   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 749   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 750   i++;
 751   do_gettimeofday_fast(&tv1);
 752
 753   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 754
 755   prev_num = num_test_timeout;
 756   while (num_test_timeout < i)
 757   {
 758     if (num_test_timeout != prev_num)
 759       prev_num = num_test_timeout;
 760   }
 761   do_gettimeofday_fast(&tv2);
 762         printk(KERN_INFO "Timers started    %is %06i\n",
 763                 tv0.tv_jiff, tv0.tv_usec);
 764         printk(KERN_INFO "Timers started at %is %06i\n",
 765                 tv1.tv_jiff, tv1.tv_usec);
 766         printk(KERN_INFO "Timers done       %is %06i\n",
 767                 tv2.tv_jiff, tv2.tv_usec);
 768   DP(printk("buf0:\n");
 769      printk(buf0);
 770      printk("buf1:\n");
 771      printk(buf1);
 772      printk("buf2:\n");
 773      printk(buf2);
 774      printk("buf3:\n");
 775      printk(buf3);
 776      printk("buf4:\n");
 777      printk(buf4);
 778   );
 779   printk("buf5:\n");
 780   printk(buf5);
 781
 782   printk("timers set:\n");
 783   for(j = 0; j<i; j++)
 784   {
 785     struct fast_timer *t = &tr[j];
 786     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 787            "data: 0x%08X func: 0x%08X\n",
 788            t->name,
 789                         t->tv_set.tv_jiff,
 790            t->tv_set.tv_usec,
 791                         t->tv_expires.tv_jiff,
 792            t->tv_expires.tv_usec,
 793            t->data,
 794            t->function
 795            );
 796
 797     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 798            t->delay_us,
 799                         tv_exp[j].tv_jiff,
 800            tv_exp[j].tv_usec,
 801            exp_num[j],
 802                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 803                                 1000000 + tv_exp[j].tv_usec -
 804                                 t->tv_expires.tv_usec);
 805   }
 806   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 807   printk("buf5 after all done:\n");
 808   printk(buf5);
 809   printk("fast_timer_test() done\n");
 810 }
 811 #endif
 812
 813
 814 int fast_timer_init(void)
 815 {
 816   /* For some reason, request_irq() hangs when called froom time_init() */
 817   if (!fast_timer_is_init)
 818   {
 819     printk("fast_timer_init()\n");
 820
 821 #ifdef CONFIG_PROC_FS
 822     fasttimer_proc_entry = create_proc_entry("fasttimer", 0, 0);
 823     if (fasttimer_proc_entry)
 824       fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 825 #endif /* PROC_FS */
 826                 if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
 827                                 IRQF_SHARED | IRQF_DISABLED,
 828                                 "fast timer int", &fast_timer_list))
 829                         printk(KERN_ERR "err: fasttimer irq\n");
 830     fast_timer_is_init = 1;
 831 #ifdef FAST_TIMER_TEST
 832     printk("do test\n");
 833     fast_timer_test();
 834 #endif
 835   }
 836         return 0;
 837 }
 838 __initcall(fast_timer_init);