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
  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
  27 /*
  28  * timer0 is running at 100MHz and generating jiffies timer ticks
  29  * at 100 or 1000 HZ.
  30  * fasttimer gives an API that gives timers that expire "between" the jiffies
  31  * giving microsecond resolution (10 ns).
  32  * fasttimer uses reg_timer_rw_trig register to get interrupt when
  33  * r_time reaches a certain value.
  34  */
  35
  36
  37 #define DEBUG_LOG_INCLUDED
  38 #define FAST_TIMER_LOG
  39 /* #define FAST_TIMER_TEST */
  40
  41 #define FAST_TIMER_SANITY_CHECKS
  42
  43 #ifdef FAST_TIMER_SANITY_CHECKS
  44 static int sanity_failed;
  45 #endif
  46
  47 #define D1(x)
  48 #define D2(x)
  49 #define DP(x)
  50
  51 static unsigned int fast_timer_running;
  52 static unsigned int fast_timers_added;
  53 static unsigned int fast_timers_started;
  54 static unsigned int fast_timers_expired;
  55 static unsigned int fast_timers_deleted;
  56 static unsigned int fast_timer_is_init;
  57 static unsigned int fast_timer_ints;
  58
  59 struct fast_timer *fast_timer_list = NULL;
  60
  61 #ifdef DEBUG_LOG_INCLUDED
  62 #define DEBUG_LOG_MAX 128
  63 static const char * debug_log_string[DEBUG_LOG_MAX];
  64 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  65 static unsigned int debug_log_cnt;
  66 static unsigned int debug_log_cnt_wrapped;
  67
  68 #define DEBUG_LOG(string, value) \
  69 { \
  70   unsigned long log_flags; \
  71   local_irq_save(log_flags); \
  72   debug_log_string[debug_log_cnt] = (string); \
  73   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  74   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  75   { \
  76     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  77     debug_log_cnt_wrapped = 1; \
  78   } \
  79   local_irq_restore(log_flags); \
  80 }
  81 #else
  82 #define DEBUG_LOG(string, value)
  83 #endif
  84
  85
  86 #define NUM_TIMER_STATS 16
  87 #ifdef FAST_TIMER_LOG
  88 struct fast_timer timer_added_log[NUM_TIMER_STATS];
  89 struct fast_timer timer_started_log[NUM_TIMER_STATS];
  90 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
  91 #endif
  92
  93 int timer_div_settings[NUM_TIMER_STATS];
  94 int timer_delay_settings[NUM_TIMER_STATS];
  95
  96 struct work_struct fast_work;
  97
  98 static void
  99 timer_trig_handler(struct work_struct *work);
 100
 101
 102
 103 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 104 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 105 {
 106         tv->tv_jiff = jiffies;
 107         tv->tv_usec = GET_JIFFIES_USEC();
 108 }
 109
 110 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 111 {
 112         /* Compare jiffies. Takes care of wrapping */
 113         if (time_before(t0->tv_jiff, t1->tv_jiff))
 114                 return -1;
 115         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 116                 return 1;
 117
 118         /* Compare us */
 119         if (t0->tv_usec < t1->tv_usec)
 120                 return -1;
 121         else if (t0->tv_usec > t1->tv_usec)
 122                 return 1;
 123         return 0;
 124 }
 125
 126 /* Called with ints off */
 127 inline void start_timer_trig(unsigned long delay_us)
 128 {
 129   reg_timer_rw_ack_intr ack_intr = { 0 };
 130   reg_timer_rw_intr_mask intr_mask;
 131   reg_timer_rw_trig trig;
 132   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 133         reg_timer_r_time r_time0;
 134         reg_timer_r_time r_time1;
 135         unsigned char trig_wrap;
 136         unsigned char time_wrap;
 137
 138         r_time0 = REG_RD(timer, regi_timer0, r_time);
 139
 140   D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
 141             delay_us, freq_index, div));
 142   /* Clear trig irq */
 143         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 144   intr_mask.trig = 0;
 145         REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 146
 147         /* Set timer values and check if trigger wraps. */
 148         /* r_time is 100MHz (10 ns resolution) */
 149         trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;
 150
 151   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
 152   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 153
 154   /* Ack interrupt */
 155   ack_intr.trig = 1;
 156         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 157
 158   /* Start timer */
 159         REG_WR(timer, regi_timer0, rw_trig, trig);
 160   trig_cfg.tmr = regk_timer_time;
 161         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 162
 163   /* Check if we have already passed the trig time */
 164         r_time1 = REG_RD(timer, regi_timer0, r_time);
 165         time_wrap = r_time1 < r_time0;
 166
 167         if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
 168     /* No, Enable trig irq */
 169                 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 170     intr_mask.trig = 1;
 171                 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 172     fast_timers_started++;
 173     fast_timer_running = 1;
 174         } else {
 175     /* We have passed the time, disable trig point, ack intr */
 176     trig_cfg.tmr = regk_timer_off;
 177                 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 178                 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 179                 /* call the int routine */
 180                 INIT_WORK(&fast_work, timer_trig_handler);
 181                 schedule_work(&fast_work);
 182   }
 183
 184 }
 185
 186 /* In version 1.4 this function takes 27 - 50 us */
 187 void start_one_shot_timer(struct fast_timer *t,
 188                           fast_timer_function_type *function,
 189                           unsigned long data,
 190                           unsigned long delay_us,
 191                           const char *name)
 192 {
 193   unsigned long flags;
 194   struct fast_timer *tmp;
 195
 196   D1(printk("sft %s %d us\n", name, delay_us));
 197
 198   local_irq_save(flags);
 199
 200   do_gettimeofday_fast(&t->tv_set);
 201   tmp = fast_timer_list;
 202
 203 #ifdef FAST_TIMER_SANITY_CHECKS
 204         /* Check so this is not in the list already... */
 205         while (tmp != NULL) {
 206                 if (tmp == t) {
 207                         printk(KERN_DEBUG
 208                                 "timer name: %s data: 0x%08lX already "
 209                                 "in list!\n", name, data);
 210                         sanity_failed++;
 211                         goto done;
 212                 } else
 213                         tmp = tmp->next;
 214         }
 215         tmp = fast_timer_list;
 216 #endif
 217
 218   t->delay_us = delay_us;
 219   t->function = function;
 220   t->data = data;
 221   t->name = name;
 222
 223   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 224         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 225         if (t->tv_expires.tv_usec > 1000000) {
 226     t->tv_expires.tv_usec -= 1000000;
 227                 t->tv_expires.tv_jiff += HZ;
 228   }
 229 #ifdef FAST_TIMER_LOG
 230   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 231 #endif
 232   fast_timers_added++;
 233
 234   /* Check if this should timeout before anything else */
 235   if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
 236     /* Put first in list and modify the timer value */
 237     t->prev = NULL;
 238     t->next = fast_timer_list;
 239     if (fast_timer_list)
 240       fast_timer_list->prev = t;
 241     fast_timer_list = t;
 242 #ifdef FAST_TIMER_LOG
 243     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 244 #endif
 245     start_timer_trig(delay_us);
 246   } else {
 247     /* Put in correct place in list */
 248     while (tmp->next &&
 249         fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 250       tmp = tmp->next;
 251     /* Insert t after tmp */
 252     t->prev = tmp;
 253     t->next = tmp->next;
 254     if (tmp->next)
 255     {
 256       tmp->next->prev = t;
 257     }
 258     tmp->next = t;
 259   }
 260
 261   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 262
 263 done:
 264   local_irq_restore(flags);
 265 } /* start_one_shot_timer */
 266
 267 static inline int fast_timer_pending (const struct fast_timer * t)
 268 {
 269   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 270 }
 271
 272 static inline int detach_fast_timer (struct fast_timer *t)
 273 {
 274   struct fast_timer *next, *prev;
 275   if (!fast_timer_pending(t))
 276     return 0;
 277   next = t->next;
 278   prev = t->prev;
 279   if (next)
 280     next->prev = prev;
 281   if (prev)
 282     prev->next = next;
 283   else
 284     fast_timer_list = next;
 285   fast_timers_deleted++;
 286   return 1;
 287 }
 288
 289 int del_fast_timer(struct fast_timer * t)
 290 {
 291   unsigned long flags;
 292   int ret;
 293
 294   local_irq_save(flags);
 295   ret = detach_fast_timer(t);
 296   t->next = t->prev = NULL;
 297   local_irq_restore(flags);
 298   return ret;
 299 } /* del_fast_timer */
 300
 301
 302 /* Interrupt routines or functions called in interrupt context */
 303
 304 /* Timer interrupt handler for trig interrupts */
 305
 306 static irqreturn_t
 307 timer_trig_interrupt(int irq, void *dev_id)
 308 {
 309   reg_timer_r_masked_intr masked_intr;
 310   /* Check if the timer interrupt is for us (a trig int) */
 311         masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
 312   if (!masked_intr.trig)
 313     return IRQ_NONE;
 314         timer_trig_handler(NULL);
 315   return IRQ_HANDLED;
 316 }
 317
 318 static void timer_trig_handler(struct work_struct *work)
 319 {
 320   reg_timer_rw_ack_intr ack_intr = { 0 };
 321   reg_timer_rw_intr_mask intr_mask;
 322   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 323   struct fast_timer *t;
 324   unsigned long flags;
 325
 326         /* We keep interrupts disabled not only when we modify the
 327          * fast timer list, but any time we hold a reference to a
 328          * timer in the list, since del_fast_timer may be called
 329          * from (another) interrupt context.  Thus, the only time
 330          * when interrupts are enabled is when calling the timer
 331          * callback function.
 332          */
 333   local_irq_save(flags);
 334
 335   /* Clear timer trig interrupt */
 336         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 337   intr_mask.trig = 0;
 338   REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 339
 340   /* First stop timer, then ack interrupt */
 341   /* Stop timer */
 342   trig_cfg.tmr = regk_timer_off;
 343         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 344
 345   /* Ack interrupt */
 346   ack_intr.trig = 1;
 347         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 348
 349   fast_timer_running = 0;
 350   fast_timer_ints++;
 351
 352         fast_timer_function_type *f;
 353         unsigned long d;
 354
 355   t = fast_timer_list;
 356         while (t) {
 357                 struct fasttime_t tv;
 358
 359     /* Has it really expired? */
 360     do_gettimeofday_fast(&tv);
 361                 D1(printk(KERN_DEBUG
 362                         "t: %is %06ius\n", tv.tv_jiff, tv.tv_usec));
 363
 364                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0) {
 365       /* Yes it has expired */
 366 #ifdef FAST_TIMER_LOG
 367       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 368 #endif
 369       fast_timers_expired++;
 370
 371       /* Remove this timer before call, since it may reuse the timer */
 372       if (t->prev)
 373         t->prev->next = t->next;
 374       else
 375         fast_timer_list = t->next;
 376       if (t->next)
 377         t->next->prev = t->prev;
 378       t->prev = NULL;
 379       t->next = NULL;
 380
 381                         /* Save function callback data before enabling
 382                          * interrupts, since the timer may be removed and we
 383                          * don't know how it was allocated (e.g. ->function
 384                          * and ->data may become overwritten after deletion
 385                          * if the timer was stack-allocated).
 386                          */
 387                         f = t->function;
 388                         d = t->data;
 389
 390                         if (f != NULL) {
 391                                 /* Run the callback function with interrupts
 392                                  * enabled. */
 393                                 local_irq_restore(flags);
 394                                 f(d);
 395                                 local_irq_save(flags);
 396                         } else
 397         DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
 398                 } else {
 399       /* Timer is to early, let's set it again using the normal routines */
 400       D1(printk(".\n"));
 401     }
 402
 403                 t = fast_timer_list;
 404                 if (t != NULL) {
 405       /* Start next timer.. */
 406                         long us = 0;
 407                         struct fasttime_t tv;
 408
 409       do_gettimeofday_fast(&tv);
 410
 411                         /* time_after_eq takes care of wrapping */
 412                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 413                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 414                                         1000000 / HZ + t->tv_expires.tv_usec -
 415                                         tv.tv_usec);
 416
 417                         if (us > 0) {
 418                                 if (!fast_timer_running) {
 419 #ifdef FAST_TIMER_LOG
 420           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 421 #endif
 422           start_timer_trig(us);
 423         }
 424         break;
 425                         } else {
 426         /* Timer already expired, let's handle it better late than never.
 427          * The normal loop handles it
 428          */
 429         D1(printk("e! %d\n", us));
 430       }
 431     }
 432   }
 433
 434         local_irq_restore(flags);
 435
 436         if (!t)
 437     D1(printk("ttrig stop!\n"));
 438 }
 439
 440 static void wake_up_func(unsigned long data)
 441 {
 442   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 443   wake_up(sleep_wait_p);
 444 }
 445
 446
 447 /* Useful API */
 448
 449 void schedule_usleep(unsigned long us)
 450 {
 451   struct fast_timer t;
 452   wait_queue_head_t sleep_wait;
 453   init_waitqueue_head(&sleep_wait);
 454
 455   D1(printk("schedule_usleep(%d)\n", us));
 456   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 457                        "usleep");
 458         /* Uninterruptible sleep on the fast timer. (The condition is
 459          * somewhat redundant since the timer is what wakes us up.) */
 460         wait_event(sleep_wait, !fast_timer_pending(&t));
 461
 462   D1(printk("done schedule_usleep(%d)\n", us));
 463 }
 464
 465 #ifdef CONFIG_PROC_FS
 466 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 467                        ,int *eof, void *data_unused);
 468 static struct proc_dir_entry *fasttimer_proc_entry;
 469 #endif /* CONFIG_PROC_FS */
 470
 471 #ifdef CONFIG_PROC_FS
 472
 473 /* This value is very much based on testing */
 474 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 475
 476 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 477                        ,int *eof, void *data_unused)
 478 {
 479   unsigned long flags;
 480   int i = 0;
 481   int num_to_show;
 482         struct fasttime_t tv;
 483   struct fast_timer *t, *nextt;
 484   static char *bigbuf = NULL;
 485   static unsigned long used;
 486
 487         if (!bigbuf) {
 488                 bigbuf = vmalloc(BIG_BUF_SIZE);
 489                 if (!bigbuf) {
 490                         used = 0;
 491                         if (buf)
 492                                 buf[0] = '\0';
 493                         return 0;
 494                 }
 495         }
 496
 497         if (!offset || !used) {
 498     do_gettimeofday_fast(&tv);
 499
 500     used = 0;
 501     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 502                     fast_timers_added);
 503     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 504                     fast_timers_started);
 505     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 506                     fast_timer_ints);
 507     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 508                     fast_timers_expired);
 509     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 510                     fast_timers_deleted);
 511     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 512                     fast_timer_running ? "yes" : "no");
 513     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 514                         (unsigned long)tv.tv_jiff,
 515                     (unsigned long)tv.tv_usec);
 516 #ifdef FAST_TIMER_SANITY_CHECKS
 517     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 518                     sanity_failed);
 519 #endif
 520     used += sprintf(bigbuf + used, "\n");
 521
 522 #ifdef DEBUG_LOG_INCLUDED
 523     {
 524       int end_i = debug_log_cnt;
 525       i = 0;
 526
 527                         if (debug_log_cnt_wrapped)
 528         i = debug_log_cnt;
 529
 530       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 531              used+100 < BIG_BUF_SIZE)
 532       {
 533         used += sprintf(bigbuf + used, debug_log_string[i],
 534                         debug_log_value[i]);
 535         i = (i+1) % DEBUG_LOG_MAX;
 536       }
 537     }
 538     used += sprintf(bigbuf + used, "\n");
 539 #endif
 540
 541     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 542                    NUM_TIMER_STATS);
 543     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 544     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 545     {
 546       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 547
 548 #if 1 //ndef FAST_TIMER_LOG
 549       used += sprintf(bigbuf + used, "div: %i delay: %i"
 550                       "\n",
 551                       timer_div_settings[cur],
 552                       timer_delay_settings[cur]
 553                       );
 554 #endif
 555 #ifdef FAST_TIMER_LOG
 556       t = &timer_started_log[cur];
 557       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 558                       "d: %6li us data: 0x%08lX"
 559                       "\n",
 560                       t->name,
 561                                 (unsigned long)t->tv_set.tv_jiff,
 562                       (unsigned long)t->tv_set.tv_usec,
 563                                 (unsigned long)t->tv_expires.tv_jiff,
 564                       (unsigned long)t->tv_expires.tv_usec,
 565                       t->delay_us,
 566                       t->data
 567                       );
 568 #endif
 569     }
 570     used += sprintf(bigbuf + used, "\n");
 571
 572 #ifdef FAST_TIMER_LOG
 573     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 574                    NUM_TIMER_STATS);
 575     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 576     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 577     {
 578       t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 579       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 580                       "d: %6li us data: 0x%08lX"
 581                       "\n",
 582                       t->name,
 583                                 (unsigned long)t->tv_set.tv_jiff,
 584                       (unsigned long)t->tv_set.tv_usec,
 585                                 (unsigned long)t->tv_expires.tv_jiff,
 586                       (unsigned long)t->tv_expires.tv_usec,
 587                       t->delay_us,
 588                       t->data
 589                       );
 590     }
 591     used += sprintf(bigbuf + used, "\n");
 592
 593     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 594                    NUM_TIMER_STATS);
 595     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 596     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 597     {
 598       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 599       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 600                       "d: %6li us data: 0x%08lX"
 601                       "\n",
 602                       t->name,
 603                                 (unsigned long)t->tv_set.tv_jiff,
 604                       (unsigned long)t->tv_set.tv_usec,
 605                                 (unsigned long)t->tv_expires.tv_jiff,
 606                       (unsigned long)t->tv_expires.tv_usec,
 607                       t->delay_us,
 608                       t->data
 609                       );
 610     }
 611     used += sprintf(bigbuf + used, "\n");
 612 #endif
 613
 614     used += sprintf(bigbuf + used, "Active timers:\n");
 615     local_irq_save(flags);
 616     t = fast_timer_list;
 617     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 618     {
 619       nextt = t->next;
 620       local_irq_restore(flags);
 621       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 622                         "d: %6li us data: 0x%08lX"
 623 /*                      " func: 0x%08lX" */
 624                         "\n",
 625                         t->name,
 626                         (unsigned long)t->tv_set.tv_jiff,
 627                         (unsigned long)t->tv_set.tv_usec,
 628                         (unsigned long)t->tv_expires.tv_jiff,
 629                         (unsigned long)t->tv_expires.tv_usec,
 630                       t->delay_us,
 631                       t->data
 632 /*                      , t->function */
 633                       );
 634                         local_irq_save(flags);
 635       if (t->next != nextt)
 636       {
 637         printk("timer removed!\n");
 638       }
 639       t = nextt;
 640     }
 641     local_irq_restore(flags);
 642   }
 643
 644   if (used - offset < len)
 645   {
 646     len = used - offset;
 647   }
 648
 649   memcpy(buf, bigbuf + offset, len);
 650   *start = buf;
 651   *eof = 1;
 652
 653   return len;
 654 }
 655 #endif /* PROC_FS */
 656
 657 #ifdef FAST_TIMER_TEST
 658 static volatile unsigned long i = 0;
 659 static volatile int num_test_timeout = 0;
 660 static struct fast_timer tr[10];
 661 static int exp_num[10];
 662
 663 static struct fasttime_t tv_exp[100];
 664
 665 static void test_timeout(unsigned long data)
 666 {
 667   do_gettimeofday_fast(&tv_exp[data]);
 668   exp_num[data] = num_test_timeout;
 669
 670   num_test_timeout++;
 671 }
 672
 673 static void test_timeout1(unsigned long data)
 674 {
 675   do_gettimeofday_fast(&tv_exp[data]);
 676   exp_num[data] = num_test_timeout;
 677   if (data < 7)
 678   {
 679     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 680     i++;
 681   }
 682   num_test_timeout++;
 683 }
 684
 685 DP(
 686 static char buf0[2000];
 687 static char buf1[2000];
 688 static char buf2[2000];
 689 static char buf3[2000];
 690 static char buf4[2000];
 691 );
 692
 693 static char buf5[6000];
 694 static int j_u[1000];
 695
 696 static void fast_timer_test(void)
 697 {
 698   int prev_num;
 699   int j;
 700
 701         struct fasttime_t tv, tv0, tv1, tv2;
 702
 703   printk("fast_timer_test() start\n");
 704   do_gettimeofday_fast(&tv);
 705
 706   for (j = 0; j < 1000; j++)
 707   {
 708     j_u[j] = GET_JIFFIES_USEC();
 709   }
 710   for (j = 0; j < 100; j++)
 711   {
 712     do_gettimeofday_fast(&tv_exp[j]);
 713   }
 714   printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
 715
 716   for (j = 0; j < 1000; j++)
 717   {
 718     printk(KERN_DEBUG "%i %i %i %i %i\n",
 719       j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
 720     j += 4;
 721   }
 722   for (j = 0; j < 100; j++)
 723   {
 724     printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 725                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 726                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 727                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 728                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 729                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 730     j += 4;
 731   }
 732   do_gettimeofday_fast(&tv0);
 733   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 734   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 735   i++;
 736   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 737   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 738   i++;
 739   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 740   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 741   i++;
 742   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 743   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 744   i++;
 745   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 746   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 747   i++;
 748   do_gettimeofday_fast(&tv1);
 749
 750   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 751
 752   prev_num = num_test_timeout;
 753   while (num_test_timeout < i)
 754   {
 755     if (num_test_timeout != prev_num)
 756       prev_num = num_test_timeout;
 757   }
 758   do_gettimeofday_fast(&tv2);
 759         printk(KERN_INFO "Timers started    %is %06i\n",
 760                 tv0.tv_jiff, tv0.tv_usec);
 761         printk(KERN_INFO "Timers started at %is %06i\n",
 762                 tv1.tv_jiff, tv1.tv_usec);
 763         printk(KERN_INFO "Timers done       %is %06i\n",
 764                 tv2.tv_jiff, tv2.tv_usec);
 765   DP(printk("buf0:\n");
 766      printk(buf0);
 767      printk("buf1:\n");
 768      printk(buf1);
 769      printk("buf2:\n");
 770      printk(buf2);
 771      printk("buf3:\n");
 772      printk(buf3);
 773      printk("buf4:\n");
 774      printk(buf4);
 775   );
 776   printk("buf5:\n");
 777   printk(buf5);
 778
 779   printk("timers set:\n");
 780   for(j = 0; j<i; j++)
 781   {
 782     struct fast_timer *t = &tr[j];
 783     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 784            "data: 0x%08X func: 0x%08X\n",
 785            t->name,
 786                         t->tv_set.tv_jiff,
 787            t->tv_set.tv_usec,
 788                         t->tv_expires.tv_jiff,
 789            t->tv_expires.tv_usec,
 790            t->data,
 791            t->function
 792            );
 793
 794     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 795            t->delay_us,
 796                         tv_exp[j].tv_jiff,
 797            tv_exp[j].tv_usec,
 798            exp_num[j],
 799                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 800                                 1000000 + tv_exp[j].tv_usec -
 801                                 t->tv_expires.tv_usec);
 802   }
 803   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 804   printk("buf5 after all done:\n");
 805   printk(buf5);
 806   printk("fast_timer_test() done\n");
 807 }
 808 #endif
 809
 810
 811 int fast_timer_init(void)
 812 {
 813   /* For some reason, request_irq() hangs when called froom time_init() */
 814   if (!fast_timer_is_init)
 815   {
 816     printk("fast_timer_init()\n");
 817
 818 #ifdef CONFIG_PROC_FS
 819     fasttimer_proc_entry = create_proc_entry("fasttimer", 0, 0);
 820     if (fasttimer_proc_entry)
 821       fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 822 #endif /* PROC_FS */
 823                 if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
 824                                 IRQF_SHARED | IRQF_DISABLED,
 825                                 "fast timer int", &fast_timer_list))
 826                         printk(KERN_ERR "err: fasttimer irq\n");
 827     fast_timer_is_init = 1;
 828 #ifdef FAST_TIMER_TEST
 829     printk("do test\n");
 830     fast_timer_test();
 831 #endif
 832   }
 833         return 0;
 834 }
 835 __initcall(fast_timer_init);