arch/cris/arch-v10/kernel/fasttimer.c

   1 /*
   2  * linux/arch/cris/kernel/fasttimer.c
   3  *
   4  * Fast timers for ETRAX100/ETRAX100LX
   5  *
   6  * Copyright (C) 2000-2007 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/mm.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/time.h>
  18 #include <linux/delay.h>
  19
  20 #include <asm/segment.h>
  21 #include <asm/io.h>
  22 #include <asm/irq.h>
  23 #include <asm/delay.h>
  24
  25 #include <arch/svinto.h>
  26 #include <asm/fasttimer.h>
  27 #include <linux/proc_fs.h>
  28
  29
  30 #define DEBUG_LOG_INCLUDED
  31 #define FAST_TIMER_LOG
  32 /* #define FAST_TIMER_TEST */
  33
  34 #define FAST_TIMER_SANITY_CHECKS
  35
  36 #ifdef FAST_TIMER_SANITY_CHECKS
  37 static int sanity_failed;
  38 #endif
  39
  40 #define D1(x)
  41 #define D2(x)
  42 #define DP(x)
  43
  44 static unsigned int fast_timer_running;
  45 static unsigned int fast_timers_added;
  46 static unsigned int fast_timers_started;
  47 static unsigned int fast_timers_expired;
  48 static unsigned int fast_timers_deleted;
  49 static unsigned int fast_timer_is_init;
  50 static unsigned int fast_timer_ints;
  51
  52 struct fast_timer *fast_timer_list = NULL;
  53
  54 #ifdef DEBUG_LOG_INCLUDED
  55 #define DEBUG_LOG_MAX 128
  56 static const char * debug_log_string[DEBUG_LOG_MAX];
  57 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  58 static unsigned int debug_log_cnt;
  59 static unsigned int debug_log_cnt_wrapped;
  60
  61 #define DEBUG_LOG(string, value) \
  62 { \
  63   unsigned long log_flags; \
  64   local_irq_save(log_flags); \
  65   debug_log_string[debug_log_cnt] = (string); \
  66   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  67   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  68   { \
  69     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  70     debug_log_cnt_wrapped = 1; \
  71   } \
  72   local_irq_restore(log_flags); \
  73 }
  74 #else
  75 #define DEBUG_LOG(string, value)
  76 #endif
  77
  78
  79 /* The frequencies for index = clkselx number in R_TIMER_CTRL */
  80 #define NUM_TIMER_FREQ 15
  81 #define MAX_USABLE_TIMER_FREQ 7
  82 #define MAX_DELAY_US  853333L
  83 const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
  84 {
  85   3,   /* 0 3333 - 853333 us */
  86   6,   /* 1 1666 - 426666 us */
  87   12,  /* 2  833 - 213333 us */
  88   24,  /* 3  416 - 106666 us */
  89   48,  /* 4  208 -  53333 us */
  90   96,  /* 5  104 -  26666 us */
  91   192, /* 6   52 -  13333 us */
  92   384, /* 7   26 -   6666 us */
  93   576,
  94   1152,
  95   2304,
  96   4608,
  97   9216,
  98   18432,
  99   62500,
 100   /* 15 = cascade */
 101 };
 102 #define NUM_TIMER_STATS 16
 103 #ifdef FAST_TIMER_LOG
 104 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 105 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 106 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 107 #endif
 108
 109 int timer_div_settings[NUM_TIMER_STATS];
 110 int timer_freq_settings[NUM_TIMER_STATS];
 111 int timer_delay_settings[NUM_TIMER_STATS];
 112
 113 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 114 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 115 {
 116         tv->tv_jiff = jiffies;
 117         tv->tv_usec = GET_JIFFIES_USEC();
 118 }
 119
 120 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 121 {
 122         /* Compare jiffies. Takes care of wrapping */
 123         if (time_before(t0->tv_jiff, t1->tv_jiff))
 124                 return -1;
 125         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 126                 return 1;
 127
 128         /* Compare us */
 129         if (t0->tv_usec < t1->tv_usec)
 130                 return -1;
 131         else if (t0->tv_usec > t1->tv_usec)
 132                 return 1;
 133         return 0;
 134 }
 135
 136 inline void start_timer1(unsigned long delay_us)
 137 {
 138   int freq_index = 0; /* This is the lowest resolution */
 139   unsigned long upper_limit = MAX_DELAY_US;
 140
 141   unsigned long div;
 142   /* Start/Restart the timer to the new shorter value */
 143   /* t = 1/freq = 1/19200 = 53us
 144    * T=div*t,  div = T/t = delay_us*freq/1000000
 145    */
 146 #if 1 /* Adaptive timer settings */
 147   while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
 148   {
 149     freq_index++;
 150     upper_limit >>= 1; /* Divide by 2 using shift */
 151   }
 152   if (freq_index > 0)
 153   {
 154     freq_index--;
 155   }
 156 #else
 157   freq_index = 6;
 158 #endif
 159   div = delay_us * timer_freq_100[freq_index]/10000;
 160   if (div < 2)
 161   {
 162     /* Maybe increase timer freq? */
 163     div = 2;
 164   }
 165   if (div > 255)
 166   {
 167     div = 0; /* This means 256, the max the timer takes */
 168     /* If a longer timeout than the timer can handle is used,
 169      * then we must restart it when it goes off.
 170      */
 171   }
 172
 173   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
 174   timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
 175   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 176
 177         D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
 178             delay_us, freq_index, div));
 179   /* Clear timer1 irq */
 180   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 181
 182   /* Set timer values */
 183   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 184     (r_timer_ctrl_shadow &
 185      ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
 186      ~IO_MASK(R_TIMER_CTRL, tm1) &
 187      ~IO_MASK(R_TIMER_CTRL, clksel1)) |
 188     IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
 189     IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
 190     IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
 191
 192   /* Ack interrupt */
 193   *R_TIMER_CTRL =  r_timer_ctrl_shadow |
 194     IO_STATE(R_TIMER_CTRL, i1, clr);
 195
 196   /* Start timer */
 197   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 198     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 199     IO_STATE(R_TIMER_CTRL, tm1, run);
 200
 201   /* Enable timer1 irq */
 202   *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
 203   fast_timers_started++;
 204   fast_timer_running = 1;
 205 }
 206
 207 /* In version 1.4 this function takes 27 - 50 us */
 208 void start_one_shot_timer(struct fast_timer *t,
 209                           fast_timer_function_type *function,
 210                           unsigned long data,
 211                           unsigned long delay_us,
 212                           const char *name)
 213 {
 214   unsigned long flags;
 215   struct fast_timer *tmp;
 216
 217   D1(printk("sft %s %d us\n", name, delay_us));
 218
 219   local_irq_save(flags);
 220
 221   do_gettimeofday_fast(&t->tv_set);
 222   tmp = fast_timer_list;
 223
 224 #ifdef FAST_TIMER_SANITY_CHECKS
 225         /* Check so this is not in the list already... */
 226         while (tmp != NULL) {
 227                 if (tmp == t) {
 228                         printk(KERN_WARNING "timer name: %s data: "
 229                                 "0x%08lX already in list!\n", name, data);
 230                         sanity_failed++;
 231                         goto done;
 232                 } else
 233                         tmp = tmp->next;
 234         }
 235         tmp = fast_timer_list;
 236 #endif
 237
 238   t->delay_us = delay_us;
 239   t->function = function;
 240   t->data = data;
 241   t->name = name;
 242
 243   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 244         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 245   if (t->tv_expires.tv_usec > 1000000)
 246   {
 247     t->tv_expires.tv_usec -= 1000000;
 248                 t->tv_expires.tv_jiff += HZ;
 249   }
 250 #ifdef FAST_TIMER_LOG
 251   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 252 #endif
 253   fast_timers_added++;
 254
 255   /* Check if this should timeout before anything else */
 256         if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 257   {
 258     /* Put first in list and modify the timer value */
 259     t->prev = NULL;
 260     t->next = fast_timer_list;
 261     if (fast_timer_list)
 262     {
 263       fast_timer_list->prev = t;
 264     }
 265     fast_timer_list = t;
 266 #ifdef FAST_TIMER_LOG
 267     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 268 #endif
 269     start_timer1(delay_us);
 270   } else {
 271     /* Put in correct place in list */
 272                 while (tmp->next && fasttime_cmp(&t->tv_expires,
 273                                 &tmp->next->tv_expires) > 0)
 274     {
 275       tmp = tmp->next;
 276     }
 277     /* Insert t after tmp */
 278     t->prev = tmp;
 279     t->next = tmp->next;
 280     if (tmp->next)
 281     {
 282       tmp->next->prev = t;
 283     }
 284     tmp->next = t;
 285   }
 286
 287   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 288
 289 done:
 290   local_irq_restore(flags);
 291 } /* start_one_shot_timer */
 292
 293 static inline int fast_timer_pending (const struct fast_timer * t)
 294 {
 295   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 296 }
 297
 298 static inline int detach_fast_timer (struct fast_timer *t)
 299 {
 300   struct fast_timer *next, *prev;
 301   if (!fast_timer_pending(t))
 302     return 0;
 303   next = t->next;
 304   prev = t->prev;
 305   if (next)
 306     next->prev = prev;
 307   if (prev)
 308     prev->next = next;
 309   else
 310     fast_timer_list = next;
 311   fast_timers_deleted++;
 312   return 1;
 313 }
 314
 315 int del_fast_timer(struct fast_timer * t)
 316 {
 317   unsigned long flags;
 318   int ret;
 319
 320   local_irq_save(flags);
 321   ret = detach_fast_timer(t);
 322   t->next = t->prev = NULL;
 323   local_irq_restore(flags);
 324   return ret;
 325 } /* del_fast_timer */
 326
 327
 328 /* Interrupt routines or functions called in interrupt context */
 329
 330 /* Timer 1 interrupt handler */
 331
 332 static irqreturn_t
 333 timer1_handler(int irq, void *dev_id)
 334 {
 335   struct fast_timer *t;
 336   unsigned long flags;
 337
 338         /* We keep interrupts disabled not only when we modify the
 339          * fast timer list, but any time we hold a reference to a
 340          * timer in the list, since del_fast_timer may be called
 341          * from (another) interrupt context.  Thus, the only time
 342          * when interrupts are enabled is when calling the timer
 343          * callback function.
 344          */
 345   local_irq_save(flags);
 346
 347   /* Clear timer1 irq */
 348   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 349
 350   /* First stop timer, then ack interrupt */
 351   /* Stop timer */
 352   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 353     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 354     IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
 355
 356   /* Ack interrupt */
 357   *R_TIMER_CTRL =  r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
 358
 359   fast_timer_running = 0;
 360   fast_timer_ints++;
 361
 362   t = fast_timer_list;
 363   while (t)
 364   {
 365                 struct fasttime_t tv;
 366                 fast_timer_function_type *f;
 367                 unsigned long d;
 368
 369     /* Has it really expired? */
 370     do_gettimeofday_fast(&tv);
 371                 D1(printk(KERN_DEBUG "t: %is %06ius\n",
 372                         tv.tv_jiff, tv.tv_usec));
 373
 374                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0)
 375     {
 376       /* Yes it has expired */
 377 #ifdef FAST_TIMER_LOG
 378       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 379 #endif
 380       fast_timers_expired++;
 381
 382       /* Remove this timer before call, since it may reuse the timer */
 383       if (t->prev)
 384       {
 385         t->prev->next = t->next;
 386       }
 387       else
 388       {
 389         fast_timer_list = t->next;
 390       }
 391       if (t->next)
 392       {
 393         t->next->prev = t->prev;
 394       }
 395       t->prev = NULL;
 396       t->next = NULL;
 397
 398                         /* Save function callback data before enabling
 399                          * interrupts, since the timer may be removed and
 400                          * we don't know how it was allocated
 401                          * (e.g. ->function and ->data may become overwritten
 402                          * after deletion if the timer was stack-allocated).
 403                          */
 404                         f = t->function;
 405                         d = t->data;
 406
 407                         if (f != NULL) {
 408                                 /* Run callback with interrupts enabled. */
 409                                 local_irq_restore(flags);
 410                                 f(d);
 411                                 local_irq_save(flags);
 412                         } else
 413         DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
 414     }
 415     else
 416     {
 417       /* Timer is to early, let's set it again using the normal routines */
 418       D1(printk(".\n"));
 419     }
 420
 421     if ((t = fast_timer_list) != NULL)
 422     {
 423       /* Start next timer.. */
 424                         long us = 0;
 425                         struct fasttime_t tv;
 426
 427       do_gettimeofday_fast(&tv);
 428
 429                         /* time_after_eq takes care of wrapping */
 430                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 431                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 432                                         1000000 / HZ + t->tv_expires.tv_usec -
 433                                         tv.tv_usec);
 434
 435       if (us > 0)
 436       {
 437         if (!fast_timer_running)
 438         {
 439 #ifdef FAST_TIMER_LOG
 440           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 441 #endif
 442           start_timer1(us);
 443         }
 444         break;
 445       }
 446       else
 447       {
 448         /* Timer already expired, let's handle it better late than never.
 449          * The normal loop handles it
 450          */
 451         D1(printk("e! %d\n", us));
 452       }
 453     }
 454   }
 455
 456         local_irq_restore(flags);
 457
 458   if (!t)
 459   {
 460     D1(printk("t1 stop!\n"));
 461   }
 462
 463   return IRQ_HANDLED;
 464 }
 465
 466 static void wake_up_func(unsigned long data)
 467 {
 468   wait_queue_head_t *sleep_wait_p = (wait_queue_head_t *)data;
 469   wake_up(sleep_wait_p);
 470 }
 471
 472
 473 /* Useful API */
 474
 475 void schedule_usleep(unsigned long us)
 476 {
 477   struct fast_timer t;
 478   wait_queue_head_t sleep_wait;
 479   init_waitqueue_head(&sleep_wait);
 480
 481   D1(printk("schedule_usleep(%d)\n", us));
 482   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 483                        "usleep");
 484         /* Uninterruptible sleep on the fast timer. (The condition is somewhat
 485          * redundant since the timer is what wakes us up.) */
 486         wait_event(sleep_wait, !fast_timer_pending(&t));
 487
 488   D1(printk("done schedule_usleep(%d)\n", us));
 489 }
 490
 491 #ifdef CONFIG_PROC_FS
 492 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 493                        ,int *eof, void *data_unused);
 494 static struct proc_dir_entry *fasttimer_proc_entry;
 495 #endif /* CONFIG_PROC_FS */
 496
 497 #ifdef CONFIG_PROC_FS
 498
 499 /* This value is very much based on testing */
 500 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 501
 502 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 503                        ,int *eof, void *data_unused)
 504 {
 505   unsigned long flags;
 506   int i = 0;
 507   int num_to_show;
 508         struct fasttime_t tv;
 509   struct fast_timer *t, *nextt;
 510   static char *bigbuf = NULL;
 511   static unsigned long used;
 512
 513   if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE)))
 514   {
 515     used = 0;
 516         if (buf)
 517                 buf[0] = '\0';
 518     return 0;
 519   }
 520
 521   if (!offset || !used)
 522   {
 523     do_gettimeofday_fast(&tv);
 524
 525     used = 0;
 526     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 527                     fast_timers_added);
 528     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 529                     fast_timers_started);
 530     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 531                     fast_timer_ints);
 532     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 533                     fast_timers_expired);
 534     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 535                     fast_timers_deleted);
 536     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 537                     fast_timer_running ? "yes" : "no");
 538     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 539                         (unsigned long)tv.tv_jiff,
 540                     (unsigned long)tv.tv_usec);
 541 #ifdef FAST_TIMER_SANITY_CHECKS
 542     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 543                     sanity_failed);
 544 #endif
 545     used += sprintf(bigbuf + used, "\n");
 546
 547 #ifdef DEBUG_LOG_INCLUDED
 548     {
 549       int end_i = debug_log_cnt;
 550       i = 0;
 551
 552       if (debug_log_cnt_wrapped)
 553       {
 554         i = debug_log_cnt;
 555       }
 556
 557       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 558              used+100 < BIG_BUF_SIZE)
 559       {
 560         used += sprintf(bigbuf + used, debug_log_string[i],
 561                         debug_log_value[i]);
 562         i = (i+1) % DEBUG_LOG_MAX;
 563       }
 564     }
 565     used += sprintf(bigbuf + used, "\n");
 566 #endif
 567
 568     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 569                    NUM_TIMER_STATS);
 570     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 571     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 572     {
 573       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 574
 575 #if 1 //ndef FAST_TIMER_LOG
 576       used += sprintf(bigbuf + used, "div: %i freq: %i delay: %i"
 577                       "\n",
 578                       timer_div_settings[cur],
 579                       timer_freq_settings[cur],
 580                       timer_delay_settings[cur]
 581                       );
 582 #endif
 583 #ifdef FAST_TIMER_LOG
 584       t = &timer_started_log[cur];
 585       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 586                       "d: %6li us data: 0x%08lX"
 587                       "\n",
 588                       t->name,
 589                         (unsigned long)t->tv_set.tv_jiff,
 590                       (unsigned long)t->tv_set.tv_usec,
 591                         (unsigned long)t->tv_expires.tv_jiff,
 592                       (unsigned long)t->tv_expires.tv_usec,
 593                       t->delay_us,
 594                       t->data
 595                       );
 596 #endif
 597     }
 598     used += sprintf(bigbuf + used, "\n");
 599
 600 #ifdef FAST_TIMER_LOG
 601     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 602                    NUM_TIMER_STATS);
 603     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 604     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 605     {
 606       t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 607       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 608                       "d: %6li us data: 0x%08lX"
 609                       "\n",
 610                       t->name,
 611                         (unsigned long)t->tv_set.tv_jiff,
 612                       (unsigned long)t->tv_set.tv_usec,
 613                         (unsigned long)t->tv_expires.tv_jiff,
 614                       (unsigned long)t->tv_expires.tv_usec,
 615                       t->delay_us,
 616                       t->data
 617                       );
 618     }
 619     used += sprintf(bigbuf + used, "\n");
 620
 621     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 622                    NUM_TIMER_STATS);
 623     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 624     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 625     {
 626       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 627       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 628                       "d: %6li us data: 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                       );
 638     }
 639     used += sprintf(bigbuf + used, "\n");
 640 #endif
 641
 642     used += sprintf(bigbuf + used, "Active timers:\n");
 643     local_irq_save(flags);
 644     t = fast_timer_list;
 645     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 646     {
 647       nextt = t->next;
 648       local_irq_restore(flags);
 649       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 650                       "d: %6li us data: 0x%08lX"
 651 /*                      " func: 0x%08lX" */
 652                       "\n",
 653                       t->name,
 654                         (unsigned long)t->tv_set.tv_jiff,
 655                       (unsigned long)t->tv_set.tv_usec,
 656                         (unsigned long)t->tv_expires.tv_jiff,
 657                       (unsigned long)t->tv_expires.tv_usec,
 658                       t->delay_us,
 659                       t->data
 660 /*                      , t->function */
 661                       );
 662         local_irq_save(flags);
 663       if (t->next != nextt)
 664       {
 665         printk(KERN_WARNING "timer removed!\n");
 666       }
 667       t = nextt;
 668     }
 669     local_irq_restore(flags);
 670   }
 671
 672   if (used - offset < len)
 673   {
 674     len = used - offset;
 675   }
 676
 677   memcpy(buf, bigbuf + offset, len);
 678   *start = buf;
 679   *eof = 1;
 680
 681   return len;
 682 }
 683 #endif /* PROC_FS */
 684
 685 #ifdef FAST_TIMER_TEST
 686 static volatile unsigned long i = 0;
 687 static volatile int num_test_timeout = 0;
 688 static struct fast_timer tr[10];
 689 static int exp_num[10];
 690
 691 static struct fasttime_t tv_exp[100];
 692
 693 static void test_timeout(unsigned long data)
 694 {
 695   do_gettimeofday_fast(&tv_exp[data]);
 696   exp_num[data] = num_test_timeout;
 697
 698   num_test_timeout++;
 699 }
 700
 701 static void test_timeout1(unsigned long data)
 702 {
 703   do_gettimeofday_fast(&tv_exp[data]);
 704   exp_num[data] = num_test_timeout;
 705   if (data < 7)
 706   {
 707     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 708     i++;
 709   }
 710   num_test_timeout++;
 711 }
 712
 713 DP(
 714 static char buf0[2000];
 715 static char buf1[2000];
 716 static char buf2[2000];
 717 static char buf3[2000];
 718 static char buf4[2000];
 719 );
 720
 721 static char buf5[6000];
 722 static int j_u[1000];
 723
 724 static void fast_timer_test(void)
 725 {
 726   int prev_num;
 727   int j;
 728
 729         struct fasttime_t tv, tv0, tv1, tv2;
 730
 731   printk("fast_timer_test() start\n");
 732   do_gettimeofday_fast(&tv);
 733
 734   for (j = 0; j < 1000; j++)
 735   {
 736     j_u[j] = GET_JIFFIES_USEC();
 737   }
 738   for (j = 0; j < 100; j++)
 739   {
 740     do_gettimeofday_fast(&tv_exp[j]);
 741   }
 742         printk(KERN_DEBUG "fast_timer_test() %is %06i\n",
 743                 tv.tv_jiff, tv.tv_usec);
 744
 745   for (j = 0; j < 1000; j++)
 746   {
 747     printk("%i %i %i %i %i\n",j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
 748     j += 4;
 749   }
 750   for (j = 0; j < 100; j++)
 751   {
 752                 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 753                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 754                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 755                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 756                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 757                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 758     j += 4;
 759   }
 760   do_gettimeofday_fast(&tv0);
 761   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 762   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 763   i++;
 764   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 765   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 766   i++;
 767   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 768   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 769   i++;
 770   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 771   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 772   i++;
 773   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 774   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 775   i++;
 776   do_gettimeofday_fast(&tv1);
 777
 778   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 779
 780   prev_num = num_test_timeout;
 781   while (num_test_timeout < i)
 782   {
 783     if (num_test_timeout != prev_num)
 784     {
 785       prev_num = num_test_timeout;
 786     }
 787   }
 788   do_gettimeofday_fast(&tv2);
 789         printk(KERN_DEBUG "Timers started    %is %06i\n",
 790                 tv0.tv_jiff, tv0.tv_usec);
 791         printk(KERN_DEBUG "Timers started at %is %06i\n",
 792                 tv1.tv_jiff, tv1.tv_usec);
 793         printk(KERN_DEBUG "Timers done       %is %06i\n",
 794                 tv2.tv_jiff, tv2.tv_usec);
 795   DP(printk("buf0:\n");
 796      printk(buf0);
 797      printk("buf1:\n");
 798      printk(buf1);
 799      printk("buf2:\n");
 800      printk(buf2);
 801      printk("buf3:\n");
 802      printk(buf3);
 803      printk("buf4:\n");
 804      printk(buf4);
 805   );
 806   printk("buf5:\n");
 807   printk(buf5);
 808
 809   printk("timers set:\n");
 810   for(j = 0; j<i; j++)
 811   {
 812     struct fast_timer *t = &tr[j];
 813     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 814            "data: 0x%08X func: 0x%08X\n",
 815            t->name,
 816                         t->tv_set.tv_jiff,
 817            t->tv_set.tv_usec,
 818                         t->tv_expires.tv_jiff,
 819            t->tv_expires.tv_usec,
 820            t->data,
 821            t->function
 822            );
 823
 824     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 825            t->delay_us,
 826                         tv_exp[j].tv_jiff,
 827            tv_exp[j].tv_usec,
 828            exp_num[j],
 829                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 830                                 1000000 + tv_exp[j].tv_usec -
 831                                 t->tv_expires.tv_usec);
 832   }
 833   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 834   printk("buf5 after all done:\n");
 835   printk(buf5);
 836   printk("fast_timer_test() done\n");
 837 }
 838 #endif
 839
 840
 841 int fast_timer_init(void)
 842 {
 843   /* For some reason, request_irq() hangs when called froom time_init() */
 844   if (!fast_timer_is_init)
 845   {
 846 #if 0 && defined(FAST_TIMER_TEST)
 847     int i;
 848 #endif
 849
 850     printk(KERN_INFO "fast_timer_init()\n");
 851
 852 #if 0 && defined(FAST_TIMER_TEST)
 853     for (i = 0; i <= TIMER0_DIV; i++)
 854     {
 855       /* We must be careful not to get overflow... */
 856       printk("%3i %6u\n", i, timer0_value_us[i]);
 857     }
 858 #endif
 859 #ifdef CONFIG_PROC_FS
 860    if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 )))
 861      fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 862 #endif /* PROC_FS */
 863     if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
 864                    "fast timer int", NULL))
 865     {
 866       printk("err: timer1 irq\n");
 867     }
 868     fast_timer_is_init = 1;
 869 #ifdef FAST_TIMER_TEST
 870     printk("do test\n");
 871     fast_timer_test();
 872 #endif
 873   }
 874         return 0;
 875 }
 876 __initcall(fast_timer_init);