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 #include <linux/seq_file.h>
  29
  30
  31 #define DEBUG_LOG_INCLUDED
  32 #define FAST_TIMER_LOG
  33 /* #define FAST_TIMER_TEST */
  34
  35 #define FAST_TIMER_SANITY_CHECKS
  36
  37 #ifdef FAST_TIMER_SANITY_CHECKS
  38 static int sanity_failed;
  39 #endif
  40
  41 #define D1(x)
  42 #define D2(x)
  43 #define DP(x)
  44
  45 static unsigned int fast_timer_running;
  46 static unsigned int fast_timers_added;
  47 static unsigned int fast_timers_started;
  48 static unsigned int fast_timers_expired;
  49 static unsigned int fast_timers_deleted;
  50 static unsigned int fast_timer_is_init;
  51 static unsigned int fast_timer_ints;
  52
  53 struct fast_timer *fast_timer_list = NULL;
  54
  55 #ifdef DEBUG_LOG_INCLUDED
  56 #define DEBUG_LOG_MAX 128
  57 static const char * debug_log_string[DEBUG_LOG_MAX];
  58 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  59 static unsigned int debug_log_cnt;
  60 static unsigned int debug_log_cnt_wrapped;
  61
  62 #define DEBUG_LOG(string, value) \
  63 { \
  64   unsigned long log_flags; \
  65   local_irq_save(log_flags); \
  66   debug_log_string[debug_log_cnt] = (string); \
  67   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  68   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  69   { \
  70     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  71     debug_log_cnt_wrapped = 1; \
  72   } \
  73   local_irq_restore(log_flags); \
  74 }
  75 #else
  76 #define DEBUG_LOG(string, value)
  77 #endif
  78
  79
  80 /* The frequencies for index = clkselx number in R_TIMER_CTRL */
  81 #define NUM_TIMER_FREQ 15
  82 #define MAX_USABLE_TIMER_FREQ 7
  83 #define MAX_DELAY_US  853333L
  84 const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
  85 {
  86   3,   /* 0 3333 - 853333 us */
  87   6,   /* 1 1666 - 426666 us */
  88   12,  /* 2  833 - 213333 us */
  89   24,  /* 3  416 - 106666 us */
  90   48,  /* 4  208 -  53333 us */
  91   96,  /* 5  104 -  26666 us */
  92   192, /* 6   52 -  13333 us */
  93   384, /* 7   26 -   6666 us */
  94   576,
  95   1152,
  96   2304,
  97   4608,
  98   9216,
  99   18432,
 100   62500,
 101   /* 15 = cascade */
 102 };
 103 #define NUM_TIMER_STATS 16
 104 #ifdef FAST_TIMER_LOG
 105 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 106 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 107 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 108 #endif
 109
 110 int timer_div_settings[NUM_TIMER_STATS];
 111 int timer_freq_settings[NUM_TIMER_STATS];
 112 int timer_delay_settings[NUM_TIMER_STATS];
 113
 114 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 115 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 116 {
 117         tv->tv_jiff = jiffies;
 118         tv->tv_usec = GET_JIFFIES_USEC();
 119 }
 120
 121 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 122 {
 123         /* Compare jiffies. Takes care of wrapping */
 124         if (time_before(t0->tv_jiff, t1->tv_jiff))
 125                 return -1;
 126         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 127                 return 1;
 128
 129         /* Compare us */
 130         if (t0->tv_usec < t1->tv_usec)
 131                 return -1;
 132         else if (t0->tv_usec > t1->tv_usec)
 133                 return 1;
 134         return 0;
 135 }
 136
 137 inline void start_timer1(unsigned long delay_us)
 138 {
 139   int freq_index = 0; /* This is the lowest resolution */
 140   unsigned long upper_limit = MAX_DELAY_US;
 141
 142   unsigned long div;
 143   /* Start/Restart the timer to the new shorter value */
 144   /* t = 1/freq = 1/19200 = 53us
 145    * T=div*t,  div = T/t = delay_us*freq/1000000
 146    */
 147 #if 1 /* Adaptive timer settings */
 148   while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
 149   {
 150     freq_index++;
 151     upper_limit >>= 1; /* Divide by 2 using shift */
 152   }
 153   if (freq_index > 0)
 154   {
 155     freq_index--;
 156   }
 157 #else
 158   freq_index = 6;
 159 #endif
 160   div = delay_us * timer_freq_100[freq_index]/10000;
 161   if (div < 2)
 162   {
 163     /* Maybe increase timer freq? */
 164     div = 2;
 165   }
 166   if (div > 255)
 167   {
 168     div = 0; /* This means 256, the max the timer takes */
 169     /* If a longer timeout than the timer can handle is used,
 170      * then we must restart it when it goes off.
 171      */
 172   }
 173
 174   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
 175   timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
 176   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 177
 178         D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
 179             delay_us, freq_index, div));
 180   /* Clear timer1 irq */
 181   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 182
 183   /* Set timer values */
 184   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 185     (r_timer_ctrl_shadow &
 186      ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
 187      ~IO_MASK(R_TIMER_CTRL, tm1) &
 188      ~IO_MASK(R_TIMER_CTRL, clksel1)) |
 189     IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
 190     IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
 191     IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
 192
 193   /* Ack interrupt */
 194   *R_TIMER_CTRL =  r_timer_ctrl_shadow |
 195     IO_STATE(R_TIMER_CTRL, i1, clr);
 196
 197   /* Start timer */
 198   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 199     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 200     IO_STATE(R_TIMER_CTRL, tm1, run);
 201
 202   /* Enable timer1 irq */
 203   *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
 204   fast_timers_started++;
 205   fast_timer_running = 1;
 206 }
 207
 208 /* In version 1.4 this function takes 27 - 50 us */
 209 void start_one_shot_timer(struct fast_timer *t,
 210                           fast_timer_function_type *function,
 211                           unsigned long data,
 212                           unsigned long delay_us,
 213                           const char *name)
 214 {
 215   unsigned long flags;
 216   struct fast_timer *tmp;
 217
 218   D1(printk("sft %s %d us\n", name, delay_us));
 219
 220   local_irq_save(flags);
 221
 222   do_gettimeofday_fast(&t->tv_set);
 223   tmp = fast_timer_list;
 224
 225 #ifdef FAST_TIMER_SANITY_CHECKS
 226         /* Check so this is not in the list already... */
 227         while (tmp != NULL) {
 228                 if (tmp == t) {
 229                         printk(KERN_WARNING "timer name: %s data: "
 230                                 "0x%08lX already in list!\n", name, data);
 231                         sanity_failed++;
 232                         goto done;
 233                 } else
 234                         tmp = tmp->next;
 235         }
 236         tmp = fast_timer_list;
 237 #endif
 238
 239   t->delay_us = delay_us;
 240   t->function = function;
 241   t->data = data;
 242   t->name = name;
 243
 244   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 245         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 246   if (t->tv_expires.tv_usec > 1000000)
 247   {
 248     t->tv_expires.tv_usec -= 1000000;
 249                 t->tv_expires.tv_jiff += HZ;
 250   }
 251 #ifdef FAST_TIMER_LOG
 252   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 253 #endif
 254   fast_timers_added++;
 255
 256   /* Check if this should timeout before anything else */
 257         if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 258   {
 259     /* Put first in list and modify the timer value */
 260     t->prev = NULL;
 261     t->next = fast_timer_list;
 262     if (fast_timer_list)
 263     {
 264       fast_timer_list->prev = t;
 265     }
 266     fast_timer_list = t;
 267 #ifdef FAST_TIMER_LOG
 268     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 269 #endif
 270     start_timer1(delay_us);
 271   } else {
 272     /* Put in correct place in list */
 273                 while (tmp->next && fasttime_cmp(&t->tv_expires,
 274                                 &tmp->next->tv_expires) > 0)
 275     {
 276       tmp = tmp->next;
 277     }
 278     /* Insert t after tmp */
 279     t->prev = tmp;
 280     t->next = tmp->next;
 281     if (tmp->next)
 282     {
 283       tmp->next->prev = t;
 284     }
 285     tmp->next = t;
 286   }
 287
 288   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 289
 290 done:
 291   local_irq_restore(flags);
 292 } /* start_one_shot_timer */
 293
 294 static inline int fast_timer_pending (const struct fast_timer * t)
 295 {
 296   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 297 }
 298
 299 static inline int detach_fast_timer (struct fast_timer *t)
 300 {
 301   struct fast_timer *next, *prev;
 302   if (!fast_timer_pending(t))
 303     return 0;
 304   next = t->next;
 305   prev = t->prev;
 306   if (next)
 307     next->prev = prev;
 308   if (prev)
 309     prev->next = next;
 310   else
 311     fast_timer_list = next;
 312   fast_timers_deleted++;
 313   return 1;
 314 }
 315
 316 int del_fast_timer(struct fast_timer * t)
 317 {
 318   unsigned long flags;
 319   int ret;
 320
 321   local_irq_save(flags);
 322   ret = detach_fast_timer(t);
 323   t->next = t->prev = NULL;
 324   local_irq_restore(flags);
 325   return ret;
 326 } /* del_fast_timer */
 327
 328
 329 /* Interrupt routines or functions called in interrupt context */
 330
 331 /* Timer 1 interrupt handler */
 332
 333 static irqreturn_t
 334 timer1_handler(int irq, void *dev_id)
 335 {
 336   struct fast_timer *t;
 337   unsigned long flags;
 338
 339         /* We keep interrupts disabled not only when we modify the
 340          * fast timer list, but any time we hold a reference to a
 341          * timer in the list, since del_fast_timer may be called
 342          * from (another) interrupt context.  Thus, the only time
 343          * when interrupts are enabled is when calling the timer
 344          * callback function.
 345          */
 346   local_irq_save(flags);
 347
 348   /* Clear timer1 irq */
 349   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 350
 351   /* First stop timer, then ack interrupt */
 352   /* Stop timer */
 353   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 354     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 355     IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
 356
 357   /* Ack interrupt */
 358   *R_TIMER_CTRL =  r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
 359
 360   fast_timer_running = 0;
 361   fast_timer_ints++;
 362
 363   t = fast_timer_list;
 364   while (t)
 365   {
 366                 struct fasttime_t tv;
 367                 fast_timer_function_type *f;
 368                 unsigned long d;
 369
 370     /* Has it really expired? */
 371     do_gettimeofday_fast(&tv);
 372                 D1(printk(KERN_DEBUG "t: %is %06ius\n",
 373                         tv.tv_jiff, tv.tv_usec));
 374
 375                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0)
 376     {
 377       /* Yes it has expired */
 378 #ifdef FAST_TIMER_LOG
 379       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 380 #endif
 381       fast_timers_expired++;
 382
 383       /* Remove this timer before call, since it may reuse the timer */
 384       if (t->prev)
 385       {
 386         t->prev->next = t->next;
 387       }
 388       else
 389       {
 390         fast_timer_list = t->next;
 391       }
 392       if (t->next)
 393       {
 394         t->next->prev = t->prev;
 395       }
 396       t->prev = NULL;
 397       t->next = NULL;
 398
 399                         /* Save function callback data before enabling
 400                          * interrupts, since the timer may be removed and
 401                          * we don't know how it was allocated
 402                          * (e.g. ->function and ->data may become overwritten
 403                          * after deletion if the timer was stack-allocated).
 404                          */
 405                         f = t->function;
 406                         d = t->data;
 407
 408                         if (f != NULL) {
 409                                 /* Run callback with interrupts enabled. */
 410                                 local_irq_restore(flags);
 411                                 f(d);
 412                                 local_irq_save(flags);
 413                         } else
 414         DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
 415     }
 416     else
 417     {
 418       /* Timer is to early, let's set it again using the normal routines */
 419       D1(printk(".\n"));
 420     }
 421
 422     if ((t = fast_timer_list) != NULL)
 423     {
 424       /* Start next timer.. */
 425                         long us = 0;
 426                         struct fasttime_t tv;
 427
 428       do_gettimeofday_fast(&tv);
 429
 430                         /* time_after_eq takes care of wrapping */
 431                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 432                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 433                                         1000000 / HZ + t->tv_expires.tv_usec -
 434                                         tv.tv_usec);
 435
 436       if (us > 0)
 437       {
 438         if (!fast_timer_running)
 439         {
 440 #ifdef FAST_TIMER_LOG
 441           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 442 #endif
 443           start_timer1(us);
 444         }
 445         break;
 446       }
 447       else
 448       {
 449         /* Timer already expired, let's handle it better late than never.
 450          * The normal loop handles it
 451          */
 452         D1(printk("e! %d\n", us));
 453       }
 454     }
 455   }
 456
 457         local_irq_restore(flags);
 458
 459   if (!t)
 460   {
 461     D1(printk("t1 stop!\n"));
 462   }
 463
 464   return IRQ_HANDLED;
 465 }
 466
 467 static void wake_up_func(unsigned long data)
 468 {
 469   wait_queue_head_t *sleep_wait_p = (wait_queue_head_t *)data;
 470   wake_up(sleep_wait_p);
 471 }
 472
 473
 474 /* Useful API */
 475
 476 void schedule_usleep(unsigned long us)
 477 {
 478   struct fast_timer t;
 479   wait_queue_head_t sleep_wait;
 480   init_waitqueue_head(&sleep_wait);
 481
 482   D1(printk("schedule_usleep(%d)\n", us));
 483   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 484                        "usleep");
 485         /* Uninterruptible sleep on the fast timer. (The condition is somewhat
 486          * redundant since the timer is what wakes us up.) */
 487         wait_event(sleep_wait, !fast_timer_pending(&t));
 488
 489   D1(printk("done schedule_usleep(%d)\n", us));
 490 }
 491
 492 #ifdef CONFIG_PROC_FS
 493 /* This value is very much based on testing */
 494 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 495
 496 static int proc_fasttimer_show(struct seq_file *m, void *v)
 497 {
 498         unsigned long flags;
 499         int i = 0;
 500         int num_to_show;
 501         struct fasttime_t tv;
 502         struct fast_timer *t, *nextt;
 503
 504         do_gettimeofday_fast(&tv);
 505
 506         seq_printf(m, "Fast timers added:     %i\n", fast_timers_added);
 507         seq_printf(m, "Fast timers started:   %i\n", fast_timers_started);
 508         seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints);
 509         seq_printf(m, "Fast timers expired:   %i\n", fast_timers_expired);
 510         seq_printf(m, "Fast timers deleted:   %i\n", fast_timers_deleted);
 511         seq_printf(m, "Fast timer running:    %s\n",
 512                    fast_timer_running ? "yes" : "no");
 513         seq_printf(m, "Current time:          %lu.%06lu\n",
 514                    (unsigned long)tv.tv_jiff,
 515                    (unsigned long)tv.tv_usec);
 516 #ifdef FAST_TIMER_SANITY_CHECKS
 517         seq_printf(m, "Sanity failed:         %i\n", sanity_failed);
 518 #endif
 519         seq_putc(m, '\n');
 520
 521 #ifdef DEBUG_LOG_INCLUDED
 522         {
 523                 int end_i = debug_log_cnt;
 524                 i = 0;
 525
 526                 if (debug_log_cnt_wrapped)
 527                         i = debug_log_cnt;
 528
 529                 while (i != end_i || debug_log_cnt_wrapped) {
 530                         if (seq_printf(m, debug_log_string[i], debug_log_value[i]) < 0)
 531                                 return 0;
 532                         i = (i+1) % DEBUG_LOG_MAX;
 533                 }
 534         }
 535         seq_putc(m, '\n');
 536 #endif
 537
 538         num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 539                        NUM_TIMER_STATS);
 540         seq_printf(m, "Timers started: %i\n", fast_timers_started);
 541         for (i = 0; i < num_to_show; i++) {
 542                 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 543
 544 #if 1 //ndef FAST_TIMER_LOG
 545                 seq_printf(m, "div: %i freq: %i delay: %i"
 546                            "\n",
 547                            timer_div_settings[cur],
 548                            timer_freq_settings[cur],
 549                            timer_delay_settings[cur]);
 550 #endif
 551 #ifdef FAST_TIMER_LOG
 552                 t = &timer_started_log[cur];
 553                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 554                                "d: %6li us data: 0x%08lX"
 555                                "\n",
 556                                t->name,
 557                                (unsigned long)t->tv_set.tv_jiff,
 558                                (unsigned long)t->tv_set.tv_usec,
 559                                (unsigned long)t->tv_expires.tv_jiff,
 560                                (unsigned long)t->tv_expires.tv_usec,
 561                                t->delay_us,
 562                                t->data) < 0)
 563                         return 0;
 564 #endif
 565         }
 566         seq_putc(m, '\n');
 567
 568 #ifdef FAST_TIMER_LOG
 569         num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 570                        NUM_TIMER_STATS);
 571         seq_printf(m, "Timers added: %i\n", fast_timers_added);
 572         for (i = 0; i < num_to_show; i++) {
 573                 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 574                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 575                                "d: %6li us data: 0x%08lX"
 576                                "\n",
 577                                t->name,
 578                                (unsigned long)t->tv_set.tv_jiff,
 579                                (unsigned long)t->tv_set.tv_usec,
 580                                (unsigned long)t->tv_expires.tv_jiff,
 581                                (unsigned long)t->tv_expires.tv_usec,
 582                                t->delay_us,
 583                                t->data) < 0)
 584                         return 0;
 585         }
 586         seq_putc(m, '\n');
 587
 588         num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 589                        NUM_TIMER_STATS);
 590         seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
 591         for (i = 0; i < num_to_show; i++) {
 592                 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 593                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 594                                "d: %6li us data: 0x%08lX"
 595                                "\n",
 596                                t->name,
 597                                (unsigned long)t->tv_set.tv_jiff,
 598                                (unsigned long)t->tv_set.tv_usec,
 599                                (unsigned long)t->tv_expires.tv_jiff,
 600                                (unsigned long)t->tv_expires.tv_usec,
 601                                t->delay_us,
 602                                t->data) < 0)
 603                         return 0;
 604         }
 605         seq_putc(m, '\n');
 606 #endif
 607
 608         seq_puts(m, "Active timers:\n");
 609         local_irq_save(flags);
 610         t = fast_timer_list;
 611         while (t) {
 612                 nextt = t->next;
 613                 local_irq_restore(flags);
 614                 if (seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 615                                "d: %6li us data: 0x%08lX"
 616 /*                      " func: 0x%08lX" */
 617                                "\n",
 618                                t->name,
 619                                (unsigned long)t->tv_set.tv_jiff,
 620                                (unsigned long)t->tv_set.tv_usec,
 621                                (unsigned long)t->tv_expires.tv_jiff,
 622                                (unsigned long)t->tv_expires.tv_usec,
 623                                t->delay_us,
 624                                t->data
 625 /*                      , t->function */
 626                                ) < 0)
 627                         return 0;
 628                 local_irq_save(flags);
 629                 if (t->next != nextt)
 630                         printk(KERN_WARNING "timer removed!\n");
 631                 t = nextt;
 632         }
 633         local_irq_restore(flags);
 634
 635         return 0;
 636 }
 637
 638 static int proc_fasttimer_open(struct inode *inode, struct file *file)
 639 {
 640         return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
 641 }
 642
 643 static const struct file_operations proc_fasttimer_fops = {
 644         .open           = proc_fasttimer_open,
 645         .read           = seq_read,
 646         .llseek         = seq_lseek,
 647         .release        = single_release,
 648 };
 649 #endif /* PROC_FS */
 650
 651 #ifdef FAST_TIMER_TEST
 652 static volatile unsigned long i = 0;
 653 static volatile int num_test_timeout = 0;
 654 static struct fast_timer tr[10];
 655 static int exp_num[10];
 656
 657 static struct fasttime_t tv_exp[100];
 658
 659 static void test_timeout(unsigned long data)
 660 {
 661   do_gettimeofday_fast(&tv_exp[data]);
 662   exp_num[data] = num_test_timeout;
 663
 664   num_test_timeout++;
 665 }
 666
 667 static void test_timeout1(unsigned long data)
 668 {
 669   do_gettimeofday_fast(&tv_exp[data]);
 670   exp_num[data] = num_test_timeout;
 671   if (data < 7)
 672   {
 673     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 674     i++;
 675   }
 676   num_test_timeout++;
 677 }
 678
 679 DP(
 680 static char buf0[2000];
 681 static char buf1[2000];
 682 static char buf2[2000];
 683 static char buf3[2000];
 684 static char buf4[2000];
 685 );
 686
 687 static char buf5[6000];
 688 static int j_u[1000];
 689
 690 static void fast_timer_test(void)
 691 {
 692   int prev_num;
 693   int j;
 694
 695         struct fasttime_t tv, tv0, tv1, tv2;
 696
 697   printk("fast_timer_test() start\n");
 698   do_gettimeofday_fast(&tv);
 699
 700   for (j = 0; j < 1000; j++)
 701   {
 702     j_u[j] = GET_JIFFIES_USEC();
 703   }
 704   for (j = 0; j < 100; j++)
 705   {
 706     do_gettimeofday_fast(&tv_exp[j]);
 707   }
 708         printk(KERN_DEBUG "fast_timer_test() %is %06i\n",
 709                 tv.tv_jiff, tv.tv_usec);
 710
 711   for (j = 0; j < 1000; j++)
 712   {
 713     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]);
 714     j += 4;
 715   }
 716   for (j = 0; j < 100; j++)
 717   {
 718                 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 719                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 720                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 721                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 722                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 723                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 724     j += 4;
 725   }
 726   do_gettimeofday_fast(&tv0);
 727   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 728   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 729   i++;
 730   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 731   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 732   i++;
 733   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 734   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 735   i++;
 736   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 737   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 738   i++;
 739   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 740   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 741   i++;
 742   do_gettimeofday_fast(&tv1);
 743
 744   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 745
 746   prev_num = num_test_timeout;
 747   while (num_test_timeout < i)
 748   {
 749     if (num_test_timeout != prev_num)
 750     {
 751       prev_num = num_test_timeout;
 752     }
 753   }
 754   do_gettimeofday_fast(&tv2);
 755         printk(KERN_DEBUG "Timers started    %is %06i\n",
 756                 tv0.tv_jiff, tv0.tv_usec);
 757         printk(KERN_DEBUG "Timers started at %is %06i\n",
 758                 tv1.tv_jiff, tv1.tv_usec);
 759         printk(KERN_DEBUG "Timers done       %is %06i\n",
 760                 tv2.tv_jiff, tv2.tv_usec);
 761   DP(printk("buf0:\n");
 762      printk(buf0);
 763      printk("buf1:\n");
 764      printk(buf1);
 765      printk("buf2:\n");
 766      printk(buf2);
 767      printk("buf3:\n");
 768      printk(buf3);
 769      printk("buf4:\n");
 770      printk(buf4);
 771   );
 772   printk("buf5:\n");
 773   printk(buf5);
 774
 775   printk("timers set:\n");
 776   for(j = 0; j<i; j++)
 777   {
 778     struct fast_timer *t = &tr[j];
 779     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 780            "data: 0x%08X func: 0x%08X\n",
 781            t->name,
 782                         t->tv_set.tv_jiff,
 783            t->tv_set.tv_usec,
 784                         t->tv_expires.tv_jiff,
 785            t->tv_expires.tv_usec,
 786            t->data,
 787            t->function
 788            );
 789
 790     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 791            t->delay_us,
 792                         tv_exp[j].tv_jiff,
 793            tv_exp[j].tv_usec,
 794            exp_num[j],
 795                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 796                                 1000000 + tv_exp[j].tv_usec -
 797                                 t->tv_expires.tv_usec);
 798   }
 799   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 800   printk("buf5 after all done:\n");
 801   printk(buf5);
 802   printk("fast_timer_test() done\n");
 803 }
 804 #endif
 805
 806
 807 int fast_timer_init(void)
 808 {
 809   /* For some reason, request_irq() hangs when called froom time_init() */
 810   if (!fast_timer_is_init)
 811   {
 812 #if 0 && defined(FAST_TIMER_TEST)
 813     int i;
 814 #endif
 815
 816     printk(KERN_INFO "fast_timer_init()\n");
 817
 818 #if 0 && defined(FAST_TIMER_TEST)
 819     for (i = 0; i <= TIMER0_DIV; i++)
 820     {
 821       /* We must be careful not to get overflow... */
 822       printk("%3i %6u\n", i, timer0_value_us[i]);
 823     }
 824 #endif
 825 #ifdef CONFIG_PROC_FS
 826    proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
 827 #endif /* PROC_FS */
 828     if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
 829                    "fast timer int", NULL))
 830     {
 831       printk("err: timer1 irq\n");
 832     }
 833     fast_timer_is_init = 1;
 834 #ifdef FAST_TIMER_TEST
 835     printk("do test\n");
 836     fast_timer_test();
 837 #endif
 838   }
 839         return 0;
 840 }
 841 __initcall(fast_timer_init);