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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/arch/cris/kernel/fasttimer.c
   4  *
   5  * Fast timers for ETRAX100/ETRAX100LX
   6  *
   7  * Copyright (C) 2000-2007 Axis Communications AB, Lund, Sweden
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/sched.h>
  12 #include <linux/kernel.h>
  13 #include <linux/param.h>
  14 #include <linux/string.h>
  15 #include <linux/mm.h>
  16 #include <linux/vmalloc.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/time.h>
  19 #include <linux/delay.h>
  20
  21 #include <asm/segment.h>
  22 #include <asm/io.h>
  23 #include <asm/irq.h>
  24 #include <asm/delay.h>
  25
  26 #include <arch/svinto.h>
  27 #include <asm/fasttimer.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/seq_file.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 static int sanity_failed;
  40 #endif
  41
  42 #define D1(x)
  43 #define D2(x)
  44 #define DP(x)
  45
  46 static unsigned int fast_timer_running;
  47 static unsigned int fast_timers_added;
  48 static unsigned int fast_timers_started;
  49 static unsigned int fast_timers_expired;
  50 static unsigned int fast_timers_deleted;
  51 static unsigned int fast_timer_is_init;
  52 static unsigned int fast_timer_ints;
  53
  54 struct fast_timer *fast_timer_list = NULL;
  55
  56 #ifdef DEBUG_LOG_INCLUDED
  57 #define DEBUG_LOG_MAX 128
  58 static const char * debug_log_string[DEBUG_LOG_MAX];
  59 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  60 static unsigned int debug_log_cnt;
  61 static unsigned int debug_log_cnt_wrapped;
  62
  63 #define DEBUG_LOG(string, value) \
  64 { \
  65   unsigned long log_flags; \
  66   local_irq_save(log_flags); \
  67   debug_log_string[debug_log_cnt] = (string); \
  68   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  69   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  70   { \
  71     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  72     debug_log_cnt_wrapped = 1; \
  73   } \
  74   local_irq_restore(log_flags); \
  75 }
  76 #else
  77 #define DEBUG_LOG(string, value)
  78 #endif
  79
  80
  81 /* The frequencies for index = clkselx number in R_TIMER_CTRL */
  82 #define NUM_TIMER_FREQ 15
  83 #define MAX_USABLE_TIMER_FREQ 7
  84 #define MAX_DELAY_US  853333L
  85 const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
  86 {
  87   3,   /* 0 3333 - 853333 us */
  88   6,   /* 1 1666 - 426666 us */
  89   12,  /* 2  833 - 213333 us */
  90   24,  /* 3  416 - 106666 us */
  91   48,  /* 4  208 -  53333 us */
  92   96,  /* 5  104 -  26666 us */
  93   192, /* 6   52 -  13333 us */
  94   384, /* 7   26 -   6666 us */
  95   576,
  96   1152,
  97   2304,
  98   4608,
  99   9216,
 100   18432,
 101   62500,
 102   /* 15 = cascade */
 103 };
 104 #define NUM_TIMER_STATS 16
 105 #ifdef FAST_TIMER_LOG
 106 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 107 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 108 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 109 #endif
 110
 111 int timer_div_settings[NUM_TIMER_STATS];
 112 int timer_freq_settings[NUM_TIMER_STATS];
 113 int timer_delay_settings[NUM_TIMER_STATS];
 114
 115 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 116 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 117 {
 118         tv->tv_jiff = jiffies;
 119         tv->tv_usec = GET_JIFFIES_USEC();
 120 }
 121
 122 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 123 {
 124         /* Compare jiffies. Takes care of wrapping */
 125         if (time_before(t0->tv_jiff, t1->tv_jiff))
 126                 return -1;
 127         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 128                 return 1;
 129
 130         /* Compare us */
 131         if (t0->tv_usec < t1->tv_usec)
 132                 return -1;
 133         else if (t0->tv_usec > t1->tv_usec)
 134                 return 1;
 135         return 0;
 136 }
 137
 138 inline void start_timer1(unsigned long delay_us)
 139 {
 140   int freq_index = 0; /* This is the lowest resolution */
 141   unsigned long upper_limit = MAX_DELAY_US;
 142
 143   unsigned long div;
 144   /* Start/Restart the timer to the new shorter value */
 145   /* t = 1/freq = 1/19200 = 53us
 146    * T=div*t,  div = T/t = delay_us*freq/1000000
 147    */
 148 #if 1 /* Adaptive timer settings */
 149   while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
 150   {
 151     freq_index++;
 152     upper_limit >>= 1; /* Divide by 2 using shift */
 153   }
 154   if (freq_index > 0)
 155   {
 156     freq_index--;
 157   }
 158 #else
 159   freq_index = 6;
 160 #endif
 161   div = delay_us * timer_freq_100[freq_index]/10000;
 162   if (div < 2)
 163   {
 164     /* Maybe increase timer freq? */
 165     div = 2;
 166   }
 167   if (div > 255)
 168   {
 169     div = 0; /* This means 256, the max the timer takes */
 170     /* If a longer timeout than the timer can handle is used,
 171      * then we must restart it when it goes off.
 172      */
 173   }
 174
 175   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
 176   timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
 177   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 178
 179         D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
 180             delay_us, freq_index, div));
 181   /* Clear timer1 irq */
 182   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 183
 184   /* Set timer values */
 185   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 186     (r_timer_ctrl_shadow &
 187      ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
 188      ~IO_MASK(R_TIMER_CTRL, tm1) &
 189      ~IO_MASK(R_TIMER_CTRL, clksel1)) |
 190     IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
 191     IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
 192     IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
 193
 194   /* Ack interrupt */
 195   *R_TIMER_CTRL =  r_timer_ctrl_shadow |
 196     IO_STATE(R_TIMER_CTRL, i1, clr);
 197
 198   /* Start timer */
 199   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 200     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 201     IO_STATE(R_TIMER_CTRL, tm1, run);
 202
 203   /* Enable timer1 irq */
 204   *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
 205   fast_timers_started++;
 206   fast_timer_running = 1;
 207 }
 208
 209 /* In version 1.4 this function takes 27 - 50 us */
 210 void start_one_shot_timer(struct fast_timer *t,
 211                           fast_timer_function_type *function,
 212                           unsigned long data,
 213                           unsigned long delay_us,
 214                           const char *name)
 215 {
 216   unsigned long flags;
 217   struct fast_timer *tmp;
 218
 219   D1(printk("sft %s %d us\n", name, delay_us));
 220
 221   local_irq_save(flags);
 222
 223   do_gettimeofday_fast(&t->tv_set);
 224   tmp = fast_timer_list;
 225
 226 #ifdef FAST_TIMER_SANITY_CHECKS
 227         /* Check so this is not in the list already... */
 228         while (tmp != NULL) {
 229                 if (tmp == t) {
 230                         printk(KERN_WARNING "timer name: %s data: "
 231                                 "0x%08lX already in list!\n", name, data);
 232                         sanity_failed++;
 233                         goto done;
 234                 } else
 235                         tmp = tmp->next;
 236         }
 237         tmp = fast_timer_list;
 238 #endif
 239
 240   t->delay_us = delay_us;
 241   t->function = function;
 242   t->data = data;
 243   t->name = name;
 244
 245   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 246         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 247   if (t->tv_expires.tv_usec > 1000000)
 248   {
 249     t->tv_expires.tv_usec -= 1000000;
 250                 t->tv_expires.tv_jiff += HZ;
 251   }
 252 #ifdef FAST_TIMER_LOG
 253   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 254 #endif
 255   fast_timers_added++;
 256
 257   /* Check if this should timeout before anything else */
 258         if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 259   {
 260     /* Put first in list and modify the timer value */
 261     t->prev = NULL;
 262     t->next = fast_timer_list;
 263     if (fast_timer_list)
 264     {
 265       fast_timer_list->prev = t;
 266     }
 267     fast_timer_list = t;
 268 #ifdef FAST_TIMER_LOG
 269     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 270 #endif
 271     start_timer1(delay_us);
 272   } else {
 273     /* Put in correct place in list */
 274                 while (tmp->next && fasttime_cmp(&t->tv_expires,
 275                                 &tmp->next->tv_expires) > 0)
 276     {
 277       tmp = tmp->next;
 278     }
 279     /* Insert t after tmp */
 280     t->prev = tmp;
 281     t->next = tmp->next;
 282     if (tmp->next)
 283     {
 284       tmp->next->prev = t;
 285     }
 286     tmp->next = t;
 287   }
 288
 289   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 290
 291 done:
 292   local_irq_restore(flags);
 293 } /* start_one_shot_timer */
 294
 295 static inline int fast_timer_pending (const struct fast_timer * t)
 296 {
 297   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 298 }
 299
 300 static inline int detach_fast_timer (struct fast_timer *t)
 301 {
 302   struct fast_timer *next, *prev;
 303   if (!fast_timer_pending(t))
 304     return 0;
 305   next = t->next;
 306   prev = t->prev;
 307   if (next)
 308     next->prev = prev;
 309   if (prev)
 310     prev->next = next;
 311   else
 312     fast_timer_list = next;
 313   fast_timers_deleted++;
 314   return 1;
 315 }
 316
 317 int del_fast_timer(struct fast_timer * t)
 318 {
 319   unsigned long flags;
 320   int ret;
 321
 322   local_irq_save(flags);
 323   ret = detach_fast_timer(t);
 324   t->next = t->prev = NULL;
 325   local_irq_restore(flags);
 326   return ret;
 327 } /* del_fast_timer */
 328
 329
 330 /* Interrupt routines or functions called in interrupt context */
 331
 332 /* Timer 1 interrupt handler */
 333
 334 static irqreturn_t
 335 timer1_handler(int irq, void *dev_id)
 336 {
 337   struct fast_timer *t;
 338   unsigned long flags;
 339
 340         /* We keep interrupts disabled not only when we modify the
 341          * fast timer list, but any time we hold a reference to a
 342          * timer in the list, since del_fast_timer may be called
 343          * from (another) interrupt context.  Thus, the only time
 344          * when interrupts are enabled is when calling the timer
 345          * callback function.
 346          */
 347   local_irq_save(flags);
 348
 349   /* Clear timer1 irq */
 350   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 351
 352   /* First stop timer, then ack interrupt */
 353   /* Stop timer */
 354   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 355     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 356     IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
 357
 358   /* Ack interrupt */
 359   *R_TIMER_CTRL =  r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
 360
 361   fast_timer_running = 0;
 362   fast_timer_ints++;
 363
 364   t = fast_timer_list;
 365   while (t)
 366   {
 367                 struct fasttime_t tv;
 368                 fast_timer_function_type *f;
 369                 unsigned long d;
 370
 371     /* Has it really expired? */
 372     do_gettimeofday_fast(&tv);
 373                 D1(printk(KERN_DEBUG "t: %is %06ius\n",
 374                         tv.tv_jiff, tv.tv_usec));
 375
 376                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0)
 377     {
 378       /* Yes it has expired */
 379 #ifdef FAST_TIMER_LOG
 380       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 381 #endif
 382       fast_timers_expired++;
 383
 384       /* Remove this timer before call, since it may reuse the timer */
 385       if (t->prev)
 386       {
 387         t->prev->next = t->next;
 388       }
 389       else
 390       {
 391         fast_timer_list = t->next;
 392       }
 393       if (t->next)
 394       {
 395         t->next->prev = t->prev;
 396       }
 397       t->prev = NULL;
 398       t->next = NULL;
 399
 400                         /* Save function callback data before enabling
 401                          * interrupts, since the timer may be removed and
 402                          * we don't know how it was allocated
 403                          * (e.g. ->function and ->data may become overwritten
 404                          * after deletion if the timer was stack-allocated).
 405                          */
 406                         f = t->function;
 407                         d = t->data;
 408
 409                         if (f != NULL) {
 410                                 /* Run callback with interrupts enabled. */
 411                                 local_irq_restore(flags);
 412                                 f(d);
 413                                 local_irq_save(flags);
 414                         } else
 415         DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
 416     }
 417     else
 418     {
 419       /* Timer is to early, let's set it again using the normal routines */
 420       D1(printk(".\n"));
 421     }
 422
 423     if ((t = fast_timer_list) != NULL)
 424     {
 425       /* Start next timer.. */
 426                         long us = 0;
 427                         struct fasttime_t tv;
 428
 429       do_gettimeofday_fast(&tv);
 430
 431                         /* time_after_eq takes care of wrapping */
 432                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 433                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 434                                         1000000 / HZ + t->tv_expires.tv_usec -
 435                                         tv.tv_usec);
 436
 437       if (us > 0)
 438       {
 439         if (!fast_timer_running)
 440         {
 441 #ifdef FAST_TIMER_LOG
 442           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 443 #endif
 444           start_timer1(us);
 445         }
 446         break;
 447       }
 448       else
 449       {
 450         /* Timer already expired, let's handle it better late than never.
 451          * The normal loop handles it
 452          */
 453         D1(printk("e! %d\n", us));
 454       }
 455     }
 456   }
 457
 458         local_irq_restore(flags);
 459
 460   if (!t)
 461   {
 462     D1(printk("t1 stop!\n"));
 463   }
 464
 465   return IRQ_HANDLED;
 466 }
 467
 468 static void wake_up_func(unsigned long data)
 469 {
 470   wait_queue_head_t *sleep_wait_p = (wait_queue_head_t *)data;
 471   wake_up(sleep_wait_p);
 472 }
 473
 474
 475 /* Useful API */
 476
 477 void schedule_usleep(unsigned long us)
 478 {
 479   struct fast_timer t;
 480   wait_queue_head_t sleep_wait;
 481   init_waitqueue_head(&sleep_wait);
 482
 483   D1(printk("schedule_usleep(%d)\n", us));
 484   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 485                        "usleep");
 486         /* Uninterruptible sleep on the fast timer. (The condition is somewhat
 487          * redundant since the timer is what wakes us up.) */
 488         wait_event(sleep_wait, !fast_timer_pending(&t));
 489
 490   D1(printk("done schedule_usleep(%d)\n", us));
 491 }
 492
 493 #ifdef CONFIG_PROC_FS
 494 /* This value is very much based on testing */
 495 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 496
 497 static int proc_fasttimer_show(struct seq_file *m, void *v)
 498 {
 499         unsigned long flags;
 500         int i = 0;
 501         int num_to_show;
 502         struct fasttime_t tv;
 503         struct fast_timer *t, *nextt;
 504
 505         do_gettimeofday_fast(&tv);
 506
 507         seq_printf(m, "Fast timers added:     %i\n", fast_timers_added);
 508         seq_printf(m, "Fast timers started:   %i\n", fast_timers_started);
 509         seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints);
 510         seq_printf(m, "Fast timers expired:   %i\n", fast_timers_expired);
 511         seq_printf(m, "Fast timers deleted:   %i\n", fast_timers_deleted);
 512         seq_printf(m, "Fast timer running:    %s\n",
 513                    fast_timer_running ? "yes" : "no");
 514         seq_printf(m, "Current time:          %lu.%06lu\n",
 515                    (unsigned long)tv.tv_jiff,
 516                    (unsigned long)tv.tv_usec);
 517 #ifdef FAST_TIMER_SANITY_CHECKS
 518         seq_printf(m, "Sanity failed:         %i\n", sanity_failed);
 519 #endif
 520         seq_putc(m, '\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) {
 531                         seq_printf(m, debug_log_string[i], debug_log_value[i]);
 532                         if (seq_has_overflowed(m))
 533                                 return 0;
 534                         i = (i+1) % DEBUG_LOG_MAX;
 535                 }
 536         }
 537         seq_putc(m, '\n');
 538 #endif
 539
 540         num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 541                        NUM_TIMER_STATS);
 542         seq_printf(m, "Timers started: %i\n", fast_timers_started);
 543         for (i = 0; i < num_to_show; i++) {
 544                 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 545
 546 #if 1 //ndef FAST_TIMER_LOG
 547                 seq_printf(m, "div: %i freq: %i delay: %i\n",
 548                            timer_div_settings[cur],
 549                            timer_freq_settings[cur],
 550                            timer_delay_settings[cur]);
 551 #endif
 552 #ifdef FAST_TIMER_LOG
 553                 t = &timer_started_log[cur];
 554                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 555                            t->name,
 556                            (unsigned long)t->tv_set.tv_jiff,
 557                            (unsigned long)t->tv_set.tv_usec,
 558                            (unsigned long)t->tv_expires.tv_jiff,
 559                            (unsigned long)t->tv_expires.tv_usec,
 560                            t->delay_us,
 561                            t->data);
 562                 if (seq_has_overflowed(m))
 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                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 575                            t->name,
 576                            (unsigned long)t->tv_set.tv_jiff,
 577                            (unsigned long)t->tv_set.tv_usec,
 578                            (unsigned long)t->tv_expires.tv_jiff,
 579                            (unsigned long)t->tv_expires.tv_usec,
 580                            t->delay_us,
 581                            t->data);
 582                 if (seq_has_overflowed(m))
 583                         return 0;
 584         }
 585         seq_putc(m, '\n');
 586
 587         num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 588                        NUM_TIMER_STATS);
 589         seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
 590         for (i = 0; i < num_to_show; i++) {
 591                 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 592                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 593                            t->name,
 594                            (unsigned long)t->tv_set.tv_jiff,
 595                            (unsigned long)t->tv_set.tv_usec,
 596                            (unsigned long)t->tv_expires.tv_jiff,
 597                            (unsigned long)t->tv_expires.tv_usec,
 598                            t->delay_us,
 599                            t->data);
 600                 if (seq_has_overflowed(m))
 601                         return 0;
 602         }
 603         seq_putc(m, '\n');
 604 #endif
 605
 606         seq_puts(m, "Active timers:\n");
 607         local_irq_save(flags);
 608         t = fast_timer_list;
 609         while (t) {
 610                 nextt = t->next;
 611                 local_irq_restore(flags);
 612                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 613                            t->name,
 614                            (unsigned long)t->tv_set.tv_jiff,
 615                            (unsigned long)t->tv_set.tv_usec,
 616                            (unsigned long)t->tv_expires.tv_jiff,
 617                            (unsigned long)t->tv_expires.tv_usec,
 618                            t->delay_us,
 619                            t->data);
 620                 if (seq_has_overflowed(m))
 621                         return 0;
 622                 local_irq_save(flags);
 623                 if (t->next != nextt)
 624                         printk(KERN_WARNING "timer removed!\n");
 625                 t = nextt;
 626         }
 627         local_irq_restore(flags);
 628
 629         return 0;
 630 }
 631
 632 static int proc_fasttimer_open(struct inode *inode, struct file *file)
 633 {
 634         return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
 635 }
 636
 637 static const struct file_operations proc_fasttimer_fops = {
 638         .open           = proc_fasttimer_open,
 639         .read           = seq_read,
 640         .llseek         = seq_lseek,
 641         .release        = single_release,
 642 };
 643 #endif /* PROC_FS */
 644
 645 #ifdef FAST_TIMER_TEST
 646 static volatile unsigned long i = 0;
 647 static volatile int num_test_timeout = 0;
 648 static struct fast_timer tr[10];
 649 static int exp_num[10];
 650
 651 static struct fasttime_t tv_exp[100];
 652
 653 static void test_timeout(unsigned long data)
 654 {
 655   do_gettimeofday_fast(&tv_exp[data]);
 656   exp_num[data] = num_test_timeout;
 657
 658   num_test_timeout++;
 659 }
 660
 661 static void test_timeout1(unsigned long data)
 662 {
 663   do_gettimeofday_fast(&tv_exp[data]);
 664   exp_num[data] = num_test_timeout;
 665   if (data < 7)
 666   {
 667     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 668     i++;
 669   }
 670   num_test_timeout++;
 671 }
 672
 673 DP(
 674 static char buf0[2000];
 675 static char buf1[2000];
 676 static char buf2[2000];
 677 static char buf3[2000];
 678 static char buf4[2000];
 679 );
 680
 681 static char buf5[6000];
 682 static int j_u[1000];
 683
 684 static void fast_timer_test(void)
 685 {
 686   int prev_num;
 687   int j;
 688
 689         struct fasttime_t tv, tv0, tv1, tv2;
 690
 691   printk("fast_timer_test() start\n");
 692   do_gettimeofday_fast(&tv);
 693
 694   for (j = 0; j < 1000; j++)
 695   {
 696     j_u[j] = GET_JIFFIES_USEC();
 697   }
 698   for (j = 0; j < 100; j++)
 699   {
 700     do_gettimeofday_fast(&tv_exp[j]);
 701   }
 702         printk(KERN_DEBUG "fast_timer_test() %is %06i\n",
 703                 tv.tv_jiff, tv.tv_usec);
 704
 705   for (j = 0; j < 1000; j++)
 706   {
 707     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]);
 708     j += 4;
 709   }
 710   for (j = 0; j < 100; j++)
 711   {
 712                 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 713                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 714                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 715                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 716                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 717                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 718     j += 4;
 719   }
 720   do_gettimeofday_fast(&tv0);
 721   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 722   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 723   i++;
 724   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 725   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 726   i++;
 727   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 728   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 729   i++;
 730   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 731   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 732   i++;
 733   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 734   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 735   i++;
 736   do_gettimeofday_fast(&tv1);
 737
 738   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 739
 740   prev_num = num_test_timeout;
 741   while (num_test_timeout < i)
 742   {
 743     if (num_test_timeout != prev_num)
 744     {
 745       prev_num = num_test_timeout;
 746     }
 747   }
 748   do_gettimeofday_fast(&tv2);
 749         printk(KERN_DEBUG "Timers started    %is %06i\n",
 750                 tv0.tv_jiff, tv0.tv_usec);
 751         printk(KERN_DEBUG "Timers started at %is %06i\n",
 752                 tv1.tv_jiff, tv1.tv_usec);
 753         printk(KERN_DEBUG "Timers done       %is %06i\n",
 754                 tv2.tv_jiff, tv2.tv_usec);
 755   DP(printk("buf0:\n");
 756      printk(buf0);
 757      printk("buf1:\n");
 758      printk(buf1);
 759      printk("buf2:\n");
 760      printk(buf2);
 761      printk("buf3:\n");
 762      printk(buf3);
 763      printk("buf4:\n");
 764      printk(buf4);
 765   );
 766   printk("buf5:\n");
 767   printk(buf5);
 768
 769   printk("timers set:\n");
 770   for(j = 0; j<i; j++)
 771   {
 772     struct fast_timer *t = &tr[j];
 773     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 774            "data: 0x%08X func: 0x%08X\n",
 775            t->name,
 776                         t->tv_set.tv_jiff,
 777            t->tv_set.tv_usec,
 778                         t->tv_expires.tv_jiff,
 779            t->tv_expires.tv_usec,
 780            t->data,
 781            t->function
 782            );
 783
 784     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 785            t->delay_us,
 786                         tv_exp[j].tv_jiff,
 787            tv_exp[j].tv_usec,
 788            exp_num[j],
 789                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 790                                 1000000 + tv_exp[j].tv_usec -
 791                                 t->tv_expires.tv_usec);
 792   }
 793   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 794   printk("buf5 after all done:\n");
 795   printk(buf5);
 796   printk("fast_timer_test() done\n");
 797 }
 798 #endif
 799
 800
 801 int fast_timer_init(void)
 802 {
 803   /* For some reason, request_irq() hangs when called froom time_init() */
 804   if (!fast_timer_is_init)
 805   {
 806 #if 0 && defined(FAST_TIMER_TEST)
 807     int i;
 808 #endif
 809
 810     printk(KERN_INFO "fast_timer_init()\n");
 811
 812 #if 0 && defined(FAST_TIMER_TEST)
 813     for (i = 0; i <= TIMER0_DIV; i++)
 814     {
 815       /* We must be careful not to get overflow... */
 816       printk("%3i %6u\n", i, timer0_value_us[i]);
 817     }
 818 #endif
 819 #ifdef CONFIG_PROC_FS
 820    proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
 821 #endif /* PROC_FS */
 822     if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
 823                    "fast timer int", NULL))
 824     {
 825       printk("err: timer1 irq\n");
 826     }
 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);