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 #include <asm/rtc.h>
  25
  26
  27 #include <asm/arch/svinto.h>
  28 #include <asm/fasttimer.h>
  29 #include <linux/proc_fs.h>
  30
  31
  32 #define DEBUG_LOG_INCLUDED
  33 #define FAST_TIMER_LOG
  34 //#define FAST_TIMER_TEST
  35
  36 #define FAST_TIMER_SANITY_CHECKS
  37
  38 #ifdef FAST_TIMER_SANITY_CHECKS
  39 #define SANITYCHECK(x) x
  40 static int sanity_failed;
  41 #else
  42 #define SANITYCHECK(x)
  43 #endif
  44
  45 #define D1(x)
  46 #define D2(x)
  47 #define DP(x)
  48
  49 static unsigned int fast_timer_running;
  50 static unsigned int fast_timers_added;
  51 static unsigned int fast_timers_started;
  52 static unsigned int fast_timers_expired;
  53 static unsigned int fast_timers_deleted;
  54 static unsigned int fast_timer_is_init;
  55 static unsigned int fast_timer_ints;
  56
  57 struct fast_timer *fast_timer_list = NULL;
  58
  59 #ifdef DEBUG_LOG_INCLUDED
  60 #define DEBUG_LOG_MAX 128
  61 static const char * debug_log_string[DEBUG_LOG_MAX];
  62 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  63 static unsigned int debug_log_cnt;
  64 static unsigned int debug_log_cnt_wrapped;
  65
  66 #define DEBUG_LOG(string, value) \
  67 { \
  68   unsigned long log_flags; \
  69   local_irq_save(log_flags); \
  70   debug_log_string[debug_log_cnt] = (string); \
  71   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  72   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  73   { \
  74     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  75     debug_log_cnt_wrapped = 1; \
  76   } \
  77   local_irq_restore(log_flags); \
  78 }
  79 #else
  80 #define DEBUG_LOG(string, value)
  81 #endif
  82
  83
  84 /* The frequencies for index = clkselx number in R_TIMER_CTRL */
  85 #define NUM_TIMER_FREQ 15
  86 #define MAX_USABLE_TIMER_FREQ 7
  87 #define MAX_DELAY_US  853333L
  88 const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
  89 {
  90   3,   /* 0 3333 - 853333 us */
  91   6,   /* 1 1666 - 426666 us */
  92   12,  /* 2  833 - 213333 us */
  93   24,  /* 3  416 - 106666 us */
  94   48,  /* 4  208 -  53333 us */
  95   96,  /* 5  104 -  26666 us */
  96   192, /* 6   52 -  13333 us */
  97   384, /* 7   26 -   6666 us */
  98   576,
  99   1152,
 100   2304,
 101   4608,
 102   9216,
 103   18432,
 104   62500,
 105   /* 15 = cascade */
 106 };
 107 #define NUM_TIMER_STATS 16
 108 #ifdef FAST_TIMER_LOG
 109 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 110 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 111 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 112 #endif
 113
 114 int timer_div_settings[NUM_TIMER_STATS];
 115 int timer_freq_settings[NUM_TIMER_STATS];
 116 int timer_delay_settings[NUM_TIMER_STATS];
 117
 118 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 119 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 120 {
 121         tv->tv_jiff = jiffies;
 122         tv->tv_usec = GET_JIFFIES_USEC();
 123 }
 124
 125 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 126 {
 127         /* Compare jiffies. Takes care of wrapping */
 128         if (time_before(t0->tv_jiff, t1->tv_jiff))
 129                 return -1;
 130         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 131                 return 1;
 132
 133         /* Compare us */
 134         if (t0->tv_usec < t1->tv_usec)
 135                 return -1;
 136         else if (t0->tv_usec > t1->tv_usec)
 137                 return 1;
 138         return 0;
 139 }
 140
 141 inline void start_timer1(unsigned long delay_us)
 142 {
 143   int freq_index = 0; /* This is the lowest resolution */
 144   unsigned long upper_limit = MAX_DELAY_US;
 145
 146   unsigned long div;
 147   /* Start/Restart the timer to the new shorter value */
 148   /* t = 1/freq = 1/19200 = 53us
 149    * T=div*t,  div = T/t = delay_us*freq/1000000
 150    */
 151 #if 1 /* Adaptive timer settings */
 152   while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
 153   {
 154     freq_index++;
 155     upper_limit >>= 1; /* Divide by 2 using shift */
 156   }
 157   if (freq_index > 0)
 158   {
 159     freq_index--;
 160   }
 161 #else
 162   freq_index = 6;
 163 #endif
 164   div = delay_us * timer_freq_100[freq_index]/10000;
 165   if (div < 2)
 166   {
 167     /* Maybe increase timer freq? */
 168     div = 2;
 169   }
 170   if (div > 255)
 171   {
 172     div = 0; /* This means 256, the max the timer takes */
 173     /* If a longer timeout than the timer can handle is used,
 174      * then we must restart it when it goes off.
 175      */
 176   }
 177
 178   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
 179   timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
 180   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 181
 182         D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
 183             delay_us, freq_index, div));
 184   /* Clear timer1 irq */
 185   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 186
 187   /* Set timer values */
 188   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 189     (r_timer_ctrl_shadow &
 190      ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
 191      ~IO_MASK(R_TIMER_CTRL, tm1) &
 192      ~IO_MASK(R_TIMER_CTRL, clksel1)) |
 193     IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
 194     IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
 195     IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
 196
 197   /* Ack interrupt */
 198   *R_TIMER_CTRL =  r_timer_ctrl_shadow |
 199     IO_STATE(R_TIMER_CTRL, i1, clr);
 200
 201   /* Start timer */
 202   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 203     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 204     IO_STATE(R_TIMER_CTRL, tm1, run);
 205
 206   /* Enable timer1 irq */
 207   *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
 208   fast_timers_started++;
 209   fast_timer_running = 1;
 210 }
 211
 212 /* In version 1.4 this function takes 27 - 50 us */
 213 void start_one_shot_timer(struct fast_timer *t,
 214                           fast_timer_function_type *function,
 215                           unsigned long data,
 216                           unsigned long delay_us,
 217                           const char *name)
 218 {
 219   unsigned long flags;
 220   struct fast_timer *tmp;
 221
 222   D1(printk("sft %s %d us\n", name, delay_us));
 223
 224   local_irq_save(flags);
 225
 226   do_gettimeofday_fast(&t->tv_set);
 227   tmp = fast_timer_list;
 228
 229   SANITYCHECK({ /* Check so this is not in the list already... */
 230     while (tmp != NULL)
 231     {
 232       if (tmp == t)
 233       {
 234         printk(KERN_WARNING
 235                "timer name: %s data: 0x%08lX already in list!\n", name, data);
 236         sanity_failed++;
 237                                 goto done;
 238       }
 239       else
 240       {
 241         tmp = tmp->next;
 242       }
 243     }
 244     tmp = fast_timer_list;
 245   });
 246
 247   t->delay_us = delay_us;
 248   t->function = function;
 249   t->data = data;
 250   t->name = name;
 251
 252   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 253         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 254   if (t->tv_expires.tv_usec > 1000000)
 255   {
 256     t->tv_expires.tv_usec -= 1000000;
 257                 t->tv_expires.tv_jiff += HZ;
 258   }
 259 #ifdef FAST_TIMER_LOG
 260   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 261 #endif
 262   fast_timers_added++;
 263
 264   /* Check if this should timeout before anything else */
 265         if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 266   {
 267     /* Put first in list and modify the timer value */
 268     t->prev = NULL;
 269     t->next = fast_timer_list;
 270     if (fast_timer_list)
 271     {
 272       fast_timer_list->prev = t;
 273     }
 274     fast_timer_list = t;
 275 #ifdef FAST_TIMER_LOG
 276     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 277 #endif
 278     start_timer1(delay_us);
 279   } else {
 280     /* Put in correct place in list */
 281                 while (tmp->next && fasttime_cmp(&t->tv_expires,
 282                                 &tmp->next->tv_expires) > 0)
 283     {
 284       tmp = tmp->next;
 285     }
 286     /* Insert t after tmp */
 287     t->prev = tmp;
 288     t->next = tmp->next;
 289     if (tmp->next)
 290     {
 291       tmp->next->prev = t;
 292     }
 293     tmp->next = t;
 294   }
 295
 296   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 297
 298 done:
 299   local_irq_restore(flags);
 300 } /* start_one_shot_timer */
 301
 302 static inline int fast_timer_pending (const struct fast_timer * t)
 303 {
 304   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 305 }
 306
 307 static inline int detach_fast_timer (struct fast_timer *t)
 308 {
 309   struct fast_timer *next, *prev;
 310   if (!fast_timer_pending(t))
 311     return 0;
 312   next = t->next;
 313   prev = t->prev;
 314   if (next)
 315     next->prev = prev;
 316   if (prev)
 317     prev->next = next;
 318   else
 319     fast_timer_list = next;
 320   fast_timers_deleted++;
 321   return 1;
 322 }
 323
 324 int del_fast_timer(struct fast_timer * t)
 325 {
 326   unsigned long flags;
 327   int ret;
 328
 329   local_irq_save(flags);
 330   ret = detach_fast_timer(t);
 331   t->next = t->prev = NULL;
 332   local_irq_restore(flags);
 333   return ret;
 334 } /* del_fast_timer */
 335
 336
 337 /* Interrupt routines or functions called in interrupt context */
 338
 339 /* Timer 1 interrupt handler */
 340
 341 static irqreturn_t
 342 timer1_handler(int irq, void *dev_id)
 343 {
 344   struct fast_timer *t;
 345   unsigned long flags;
 346
 347         /* We keep interrupts disabled not only when we modify the
 348          * fast timer list, but any time we hold a reference to a
 349          * timer in the list, since del_fast_timer may be called
 350          * from (another) interrupt context.  Thus, the only time
 351          * when interrupts are enabled is when calling the timer
 352          * callback function.
 353          */
 354   local_irq_save(flags);
 355
 356   /* Clear timer1 irq */
 357   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 358
 359   /* First stop timer, then ack interrupt */
 360   /* Stop timer */
 361   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 362     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 363     IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
 364
 365   /* Ack interrupt */
 366   *R_TIMER_CTRL =  r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
 367
 368   fast_timer_running = 0;
 369   fast_timer_ints++;
 370
 371   t = fast_timer_list;
 372   while (t)
 373   {
 374                 struct fasttime_t tv;
 375                 fast_timer_function_type *f;
 376                 unsigned long d;
 377
 378     /* Has it really expired? */
 379     do_gettimeofday_fast(&tv);
 380                 D1(printk(KERN_DEBUG "t: %is %06ius\n",
 381                         tv.tv_jiff, tv.tv_usec));
 382
 383                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0)
 384     {
 385       /* Yes it has expired */
 386 #ifdef FAST_TIMER_LOG
 387       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 388 #endif
 389       fast_timers_expired++;
 390
 391       /* Remove this timer before call, since it may reuse the timer */
 392       if (t->prev)
 393       {
 394         t->prev->next = t->next;
 395       }
 396       else
 397       {
 398         fast_timer_list = t->next;
 399       }
 400       if (t->next)
 401       {
 402         t->next->prev = t->prev;
 403       }
 404       t->prev = NULL;
 405       t->next = NULL;
 406
 407                         /* Save function callback data before enabling
 408                          * interrupts, since the timer may be removed and
 409                          * we don't know how it was allocated
 410                          * (e.g. ->function and ->data may become overwritten
 411                          * after deletion if the timer was stack-allocated).
 412                          */
 413                         f = t->function;
 414                         d = t->data;
 415
 416                         if (f != NULL) {
 417                                 /* Run callback with interrupts enabled. */
 418                                 local_irq_restore(flags);
 419                                 f(d);
 420                                 local_irq_save(flags);
 421                         } else
 422         DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
 423     }
 424     else
 425     {
 426       /* Timer is to early, let's set it again using the normal routines */
 427       D1(printk(".\n"));
 428     }
 429
 430     if ((t = fast_timer_list) != NULL)
 431     {
 432       /* Start next timer.. */
 433                         long us = 0;
 434                         struct fasttime_t tv;
 435
 436       do_gettimeofday_fast(&tv);
 437
 438                         /* time_after_eq takes care of wrapping */
 439                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 440                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 441                                         1000000 / HZ + t->tv_expires.tv_usec -
 442                                         tv.tv_usec);
 443
 444       if (us > 0)
 445       {
 446         if (!fast_timer_running)
 447         {
 448 #ifdef FAST_TIMER_LOG
 449           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 450 #endif
 451           start_timer1(us);
 452         }
 453         break;
 454       }
 455       else
 456       {
 457         /* Timer already expired, let's handle it better late than never.
 458          * The normal loop handles it
 459          */
 460         D1(printk("e! %d\n", us));
 461       }
 462     }
 463   }
 464
 465         local_irq_restore(flags);
 466
 467   if (!t)
 468   {
 469     D1(printk("t1 stop!\n"));
 470   }
 471
 472   return IRQ_HANDLED;
 473 }
 474
 475 static void wake_up_func(unsigned long data)
 476 {
 477 #ifdef DECLARE_WAITQUEUE
 478   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 479 #else
 480   struct wait_queue **sleep_wait_p = (struct wait_queue **)data;
 481 #endif
 482   wake_up(sleep_wait_p);
 483 }
 484
 485
 486 /* Useful API */
 487
 488 void schedule_usleep(unsigned long us)
 489 {
 490   struct fast_timer t;
 491   wait_queue_head_t sleep_wait;
 492   init_waitqueue_head(&sleep_wait);
 493
 494   D1(printk("schedule_usleep(%d)\n", us));
 495   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 496                        "usleep");
 497         /* Uninterruptible sleep on the fast timer. (The condition is somewhat
 498          * redundant since the timer is what wakes us up.) */
 499         wait_event(sleep_wait, !fast_timer_pending(&t));
 500
 501   D1(printk("done schedule_usleep(%d)\n", us));
 502 }
 503
 504 #ifdef CONFIG_PROC_FS
 505 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 506                        ,int *eof, void *data_unused);
 507 static struct proc_dir_entry *fasttimer_proc_entry;
 508 #endif /* CONFIG_PROC_FS */
 509
 510 #ifdef CONFIG_PROC_FS
 511
 512 /* This value is very much based on testing */
 513 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 514
 515 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 516                        ,int *eof, void *data_unused)
 517 {
 518   unsigned long flags;
 519   int i = 0;
 520   int num_to_show;
 521         struct fasttime_t tv;
 522   struct fast_timer *t, *nextt;
 523   static char *bigbuf = NULL;
 524   static unsigned long used;
 525
 526   if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE)))
 527   {
 528     used = 0;
 529         if (buf)
 530                 buf[0] = '\0';
 531     return 0;
 532   }
 533
 534   if (!offset || !used)
 535   {
 536     do_gettimeofday_fast(&tv);
 537
 538     used = 0;
 539     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 540                     fast_timers_added);
 541     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 542                     fast_timers_started);
 543     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 544                     fast_timer_ints);
 545     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 546                     fast_timers_expired);
 547     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 548                     fast_timers_deleted);
 549     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 550                     fast_timer_running ? "yes" : "no");
 551     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 552                         (unsigned long)tv.tv_jiff,
 553                     (unsigned long)tv.tv_usec);
 554 #ifdef FAST_TIMER_SANITY_CHECKS
 555     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 556                     sanity_failed);
 557 #endif
 558     used += sprintf(bigbuf + used, "\n");
 559
 560 #ifdef DEBUG_LOG_INCLUDED
 561     {
 562       int end_i = debug_log_cnt;
 563       i = 0;
 564
 565       if (debug_log_cnt_wrapped)
 566       {
 567         i = debug_log_cnt;
 568       }
 569
 570       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 571              used+100 < BIG_BUF_SIZE)
 572       {
 573         used += sprintf(bigbuf + used, debug_log_string[i],
 574                         debug_log_value[i]);
 575         i = (i+1) % DEBUG_LOG_MAX;
 576       }
 577     }
 578     used += sprintf(bigbuf + used, "\n");
 579 #endif
 580
 581     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 582                    NUM_TIMER_STATS);
 583     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 584     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 585     {
 586       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 587
 588 #if 1 //ndef FAST_TIMER_LOG
 589       used += sprintf(bigbuf + used, "div: %i freq: %i delay: %i"
 590                       "\n",
 591                       timer_div_settings[cur],
 592                       timer_freq_settings[cur],
 593                       timer_delay_settings[cur]
 594                       );
 595 #endif
 596 #ifdef FAST_TIMER_LOG
 597       t = &timer_started_log[cur];
 598       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 599                       "d: %6li us data: 0x%08lX"
 600                       "\n",
 601                       t->name,
 602                         (unsigned long)t->tv_set.tv_jiff,
 603                       (unsigned long)t->tv_set.tv_usec,
 604                         (unsigned long)t->tv_expires.tv_jiff,
 605                       (unsigned long)t->tv_expires.tv_usec,
 606                       t->delay_us,
 607                       t->data
 608                       );
 609 #endif
 610     }
 611     used += sprintf(bigbuf + used, "\n");
 612
 613 #ifdef FAST_TIMER_LOG
 614     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 615                    NUM_TIMER_STATS);
 616     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 617     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 618     {
 619       t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 620       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 621                       "d: %6li us data: 0x%08lX"
 622                       "\n",
 623                       t->name,
 624                         (unsigned long)t->tv_set.tv_jiff,
 625                       (unsigned long)t->tv_set.tv_usec,
 626                         (unsigned long)t->tv_expires.tv_jiff,
 627                       (unsigned long)t->tv_expires.tv_usec,
 628                       t->delay_us,
 629                       t->data
 630                       );
 631     }
 632     used += sprintf(bigbuf + used, "\n");
 633
 634     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 635                    NUM_TIMER_STATS);
 636     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 637     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 638     {
 639       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 640       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 641                       "d: %6li us data: 0x%08lX"
 642                       "\n",
 643                       t->name,
 644                         (unsigned long)t->tv_set.tv_jiff,
 645                       (unsigned long)t->tv_set.tv_usec,
 646                         (unsigned long)t->tv_expires.tv_jiff,
 647                       (unsigned long)t->tv_expires.tv_usec,
 648                       t->delay_us,
 649                       t->data
 650                       );
 651     }
 652     used += sprintf(bigbuf + used, "\n");
 653 #endif
 654
 655     used += sprintf(bigbuf + used, "Active timers:\n");
 656     local_irq_save(flags);
 657     t = fast_timer_list;
 658     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 659     {
 660       nextt = t->next;
 661       local_irq_restore(flags);
 662       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 663                       "d: %6li us data: 0x%08lX"
 664 /*                      " func: 0x%08lX" */
 665                       "\n",
 666                       t->name,
 667                         (unsigned long)t->tv_set.tv_jiff,
 668                       (unsigned long)t->tv_set.tv_usec,
 669                         (unsigned long)t->tv_expires.tv_jiff,
 670                       (unsigned long)t->tv_expires.tv_usec,
 671                       t->delay_us,
 672                       t->data
 673 /*                      , t->function */
 674                       );
 675         local_irq_save(flags);
 676       if (t->next != nextt)
 677       {
 678         printk(KERN_WARNING "timer removed!\n");
 679       }
 680       t = nextt;
 681     }
 682     local_irq_restore(flags);
 683   }
 684
 685   if (used - offset < len)
 686   {
 687     len = used - offset;
 688   }
 689
 690   memcpy(buf, bigbuf + offset, len);
 691   *start = buf;
 692   *eof = 1;
 693
 694   return len;
 695 }
 696 #endif /* PROC_FS */
 697
 698 #ifdef FAST_TIMER_TEST
 699 static volatile unsigned long i = 0;
 700 static volatile int num_test_timeout = 0;
 701 static struct fast_timer tr[10];
 702 static int exp_num[10];
 703
 704 static struct fasttime_t tv_exp[100];
 705
 706 static void test_timeout(unsigned long data)
 707 {
 708   do_gettimeofday_fast(&tv_exp[data]);
 709   exp_num[data] = num_test_timeout;
 710
 711   num_test_timeout++;
 712 }
 713
 714 static void test_timeout1(unsigned long data)
 715 {
 716   do_gettimeofday_fast(&tv_exp[data]);
 717   exp_num[data] = num_test_timeout;
 718   if (data < 7)
 719   {
 720     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 721     i++;
 722   }
 723   num_test_timeout++;
 724 }
 725
 726 DP(
 727 static char buf0[2000];
 728 static char buf1[2000];
 729 static char buf2[2000];
 730 static char buf3[2000];
 731 static char buf4[2000];
 732 );
 733
 734 static char buf5[6000];
 735 static int j_u[1000];
 736
 737 static void fast_timer_test(void)
 738 {
 739   int prev_num;
 740   int j;
 741
 742         struct fasttime_t tv, tv0, tv1, tv2;
 743
 744   printk("fast_timer_test() start\n");
 745   do_gettimeofday_fast(&tv);
 746
 747   for (j = 0; j < 1000; j++)
 748   {
 749     j_u[j] = GET_JIFFIES_USEC();
 750   }
 751   for (j = 0; j < 100; j++)
 752   {
 753     do_gettimeofday_fast(&tv_exp[j]);
 754   }
 755         printk(KERN_DEBUG "fast_timer_test() %is %06i\n",
 756                 tv.tv_jiff, tv.tv_usec);
 757
 758   for (j = 0; j < 1000; j++)
 759   {
 760     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]);
 761     j += 4;
 762   }
 763   for (j = 0; j < 100; j++)
 764   {
 765                 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 766                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 767                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 768                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 769                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 770                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 771     j += 4;
 772   }
 773   do_gettimeofday_fast(&tv0);
 774   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 775   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 776   i++;
 777   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 778   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 779   i++;
 780   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 781   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 782   i++;
 783   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 784   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 785   i++;
 786   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 787   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 788   i++;
 789   do_gettimeofday_fast(&tv1);
 790
 791   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 792
 793   prev_num = num_test_timeout;
 794   while (num_test_timeout < i)
 795   {
 796     if (num_test_timeout != prev_num)
 797     {
 798       prev_num = num_test_timeout;
 799     }
 800   }
 801   do_gettimeofday_fast(&tv2);
 802         printk(KERN_DEBUG "Timers started    %is %06i\n",
 803                 tv0.tv_jiff, tv0.tv_usec);
 804         printk(KERN_DEBUG "Timers started at %is %06i\n",
 805                 tv1.tv_jiff, tv1.tv_usec);
 806         printk(KERN_DEBUG "Timers done       %is %06i\n",
 807                 tv2.tv_jiff, tv2.tv_usec);
 808   DP(printk("buf0:\n");
 809      printk(buf0);
 810      printk("buf1:\n");
 811      printk(buf1);
 812      printk("buf2:\n");
 813      printk(buf2);
 814      printk("buf3:\n");
 815      printk(buf3);
 816      printk("buf4:\n");
 817      printk(buf4);
 818   );
 819   printk("buf5:\n");
 820   printk(buf5);
 821
 822   printk("timers set:\n");
 823   for(j = 0; j<i; j++)
 824   {
 825     struct fast_timer *t = &tr[j];
 826     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 827            "data: 0x%08X func: 0x%08X\n",
 828            t->name,
 829                         t->tv_set.tv_jiff,
 830            t->tv_set.tv_usec,
 831                         t->tv_expires.tv_jiff,
 832            t->tv_expires.tv_usec,
 833            t->data,
 834            t->function
 835            );
 836
 837     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 838            t->delay_us,
 839                         tv_exp[j].tv_jiff,
 840            tv_exp[j].tv_usec,
 841            exp_num[j],
 842                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 843                                 1000000 + tv_exp[j].tv_usec -
 844                                 t->tv_expires.tv_usec);
 845   }
 846   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 847   printk("buf5 after all done:\n");
 848   printk(buf5);
 849   printk("fast_timer_test() done\n");
 850 }
 851 #endif
 852
 853
 854 int fast_timer_init(void)
 855 {
 856   /* For some reason, request_irq() hangs when called froom time_init() */
 857   if (!fast_timer_is_init)
 858   {
 859 #if 0 && defined(FAST_TIMER_TEST)
 860     int i;
 861 #endif
 862
 863     printk(KERN_INFO "fast_timer_init()\n");
 864
 865 #if 0 && defined(FAST_TIMER_TEST)
 866     for (i = 0; i <= TIMER0_DIV; i++)
 867     {
 868       /* We must be careful not to get overflow... */
 869       printk("%3i %6u\n", i, timer0_value_us[i]);
 870     }
 871 #endif
 872 #ifdef CONFIG_PROC_FS
 873    if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 )))
 874      fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 875 #endif /* PROC_FS */
 876     if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
 877                    "fast timer int", NULL))
 878     {
 879       printk("err: timer1 irq\n");
 880     }
 881     fast_timer_is_init = 1;
 882 #ifdef FAST_TIMER_TEST
 883     printk("do test\n");
 884     fast_timer_test();
 885 #endif
 886   }
 887         return 0;
 888 }
 889 __initcall(fast_timer_init);