arch/cris/arch-v32/kernel/fasttimer.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/arch/cris/kernel/fasttimer.c
   4  *
   5  * Fast timers for ETRAX FS
   6  *
   7  * Copyright (C) 2000-2006 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/vmalloc.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/time.h>
  18 #include <linux/delay.h>
  19
  20 #include <asm/irq.h>
  21
  22 #include <hwregs/reg_map.h>
  23 #include <hwregs/reg_rdwr.h>
  24 #include <hwregs/timer_defs.h>
  25 #include <asm/fasttimer.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/seq_file.h>
  28
  29 /*
  30  * timer0 is running at 100MHz and generating jiffies timer ticks
  31  * at 100 or 1000 HZ.
  32  * fasttimer gives an API that gives timers that expire "between" the jiffies
  33  * giving microsecond resolution (10 ns).
  34  * fasttimer uses reg_timer_rw_trig register to get interrupt when
  35  * r_time reaches a certain value.
  36  */
  37
  38
  39 #define DEBUG_LOG_INCLUDED
  40 #define FAST_TIMER_LOG
  41 /* #define FAST_TIMER_TEST */
  42
  43 #define FAST_TIMER_SANITY_CHECKS
  44
  45 #ifdef FAST_TIMER_SANITY_CHECKS
  46 static int sanity_failed;
  47 #endif
  48
  49 #define D1(x)
  50 #define D2(x)
  51 #define DP(x)
  52
  53 static unsigned int fast_timer_running;
  54 static unsigned int fast_timers_added;
  55 static unsigned int fast_timers_started;
  56 static unsigned int fast_timers_expired;
  57 static unsigned int fast_timers_deleted;
  58 static unsigned int fast_timer_is_init;
  59 static unsigned int fast_timer_ints;
  60
  61 struct fast_timer *fast_timer_list = NULL;
  62
  63 #ifdef DEBUG_LOG_INCLUDED
  64 #define DEBUG_LOG_MAX 128
  65 static const char * debug_log_string[DEBUG_LOG_MAX];
  66 static unsigned long debug_log_value[DEBUG_LOG_MAX];
  67 static unsigned int debug_log_cnt;
  68 static unsigned int debug_log_cnt_wrapped;
  69
  70 #define DEBUG_LOG(string, value) \
  71 { \
  72   unsigned long log_flags; \
  73   local_irq_save(log_flags); \
  74   debug_log_string[debug_log_cnt] = (string); \
  75   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
  76   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
  77   { \
  78     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
  79     debug_log_cnt_wrapped = 1; \
  80   } \
  81   local_irq_restore(log_flags); \
  82 }
  83 #else
  84 #define DEBUG_LOG(string, value)
  85 #endif
  86
  87
  88 #define NUM_TIMER_STATS 16
  89 #ifdef FAST_TIMER_LOG
  90 struct fast_timer timer_added_log[NUM_TIMER_STATS];
  91 struct fast_timer timer_started_log[NUM_TIMER_STATS];
  92 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
  93 #endif
  94
  95 int timer_div_settings[NUM_TIMER_STATS];
  96 int timer_delay_settings[NUM_TIMER_STATS];
  97
  98 struct work_struct fast_work;
  99
 100 static void
 101 timer_trig_handler(struct work_struct *work);
 102
 103
 104
 105 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 106 inline void do_gettimeofday_fast(struct fasttime_t *tv)
 107 {
 108         tv->tv_jiff = jiffies;
 109         tv->tv_usec = GET_JIFFIES_USEC();
 110 }
 111
 112 inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
 113 {
 114         /* Compare jiffies. Takes care of wrapping */
 115         if (time_before(t0->tv_jiff, t1->tv_jiff))
 116                 return -1;
 117         else if (time_after(t0->tv_jiff, t1->tv_jiff))
 118                 return 1;
 119
 120         /* Compare us */
 121         if (t0->tv_usec < t1->tv_usec)
 122                 return -1;
 123         else if (t0->tv_usec > t1->tv_usec)
 124                 return 1;
 125         return 0;
 126 }
 127
 128 /* Called with ints off */
 129 inline void start_timer_trig(unsigned long delay_us)
 130 {
 131   reg_timer_rw_ack_intr ack_intr = { 0 };
 132   reg_timer_rw_intr_mask intr_mask;
 133   reg_timer_rw_trig trig;
 134   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 135         reg_timer_r_time r_time0;
 136         reg_timer_r_time r_time1;
 137         unsigned char trig_wrap;
 138         unsigned char time_wrap;
 139
 140         r_time0 = REG_RD(timer, regi_timer0, r_time);
 141
 142   D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
 143             delay_us, freq_index, div));
 144   /* Clear trig irq */
 145         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 146   intr_mask.trig = 0;
 147         REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 148
 149         /* Set timer values and check if trigger wraps. */
 150         /* r_time is 100MHz (10 ns resolution) */
 151         trig_wrap = (trig = r_time0 + delay_us*(1000/10)) < r_time0;
 152
 153   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
 154   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 155
 156   /* Ack interrupt */
 157   ack_intr.trig = 1;
 158         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 159
 160   /* Start timer */
 161         REG_WR(timer, regi_timer0, rw_trig, trig);
 162   trig_cfg.tmr = regk_timer_time;
 163         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 164
 165   /* Check if we have already passed the trig time */
 166         r_time1 = REG_RD(timer, regi_timer0, r_time);
 167         time_wrap = r_time1 < r_time0;
 168
 169         if ((trig_wrap && !time_wrap) || (r_time1 < trig)) {
 170     /* No, Enable trig irq */
 171                 intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 172     intr_mask.trig = 1;
 173                 REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 174     fast_timers_started++;
 175     fast_timer_running = 1;
 176         } else {
 177     /* We have passed the time, disable trig point, ack intr */
 178     trig_cfg.tmr = regk_timer_off;
 179                 REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 180                 REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 181                 /* call the int routine */
 182                 INIT_WORK(&fast_work, timer_trig_handler);
 183                 schedule_work(&fast_work);
 184   }
 185
 186 }
 187
 188 /* In version 1.4 this function takes 27 - 50 us */
 189 void start_one_shot_timer(struct fast_timer *t,
 190                           fast_timer_function_type *function,
 191                           unsigned long data,
 192                           unsigned long delay_us,
 193                           const char *name)
 194 {
 195   unsigned long flags;
 196   struct fast_timer *tmp;
 197
 198   D1(printk("sft %s %d us\n", name, delay_us));
 199
 200   local_irq_save(flags);
 201
 202   do_gettimeofday_fast(&t->tv_set);
 203   tmp = fast_timer_list;
 204
 205 #ifdef FAST_TIMER_SANITY_CHECKS
 206         /* Check so this is not in the list already... */
 207         while (tmp != NULL) {
 208                 if (tmp == t) {
 209                         printk(KERN_DEBUG
 210                                 "timer name: %s data: 0x%08lX already "
 211                                 "in list!\n", name, data);
 212                         sanity_failed++;
 213                         goto done;
 214                 } else
 215                         tmp = tmp->next;
 216         }
 217         tmp = fast_timer_list;
 218 #endif
 219
 220   t->delay_us = delay_us;
 221   t->function = function;
 222   t->data = data;
 223   t->name = name;
 224
 225   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 226         t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
 227         if (t->tv_expires.tv_usec > 1000000) {
 228     t->tv_expires.tv_usec -= 1000000;
 229                 t->tv_expires.tv_jiff += HZ;
 230   }
 231 #ifdef FAST_TIMER_LOG
 232   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 233 #endif
 234   fast_timers_added++;
 235
 236   /* Check if this should timeout before anything else */
 237   if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0) {
 238     /* Put first in list and modify the timer value */
 239     t->prev = NULL;
 240     t->next = fast_timer_list;
 241     if (fast_timer_list)
 242       fast_timer_list->prev = t;
 243     fast_timer_list = t;
 244 #ifdef FAST_TIMER_LOG
 245     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 246 #endif
 247     start_timer_trig(delay_us);
 248   } else {
 249     /* Put in correct place in list */
 250     while (tmp->next &&
 251         fasttime_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 252       tmp = tmp->next;
 253     /* Insert t after tmp */
 254     t->prev = tmp;
 255     t->next = tmp->next;
 256     if (tmp->next)
 257     {
 258       tmp->next->prev = t;
 259     }
 260     tmp->next = t;
 261   }
 262
 263   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 264
 265 done:
 266   local_irq_restore(flags);
 267 } /* start_one_shot_timer */
 268
 269 static inline int fast_timer_pending (const struct fast_timer * t)
 270 {
 271   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 272 }
 273
 274 static inline int detach_fast_timer (struct fast_timer *t)
 275 {
 276   struct fast_timer *next, *prev;
 277   if (!fast_timer_pending(t))
 278     return 0;
 279   next = t->next;
 280   prev = t->prev;
 281   if (next)
 282     next->prev = prev;
 283   if (prev)
 284     prev->next = next;
 285   else
 286     fast_timer_list = next;
 287   fast_timers_deleted++;
 288   return 1;
 289 }
 290
 291 int del_fast_timer(struct fast_timer * t)
 292 {
 293   unsigned long flags;
 294   int ret;
 295
 296   local_irq_save(flags);
 297   ret = detach_fast_timer(t);
 298   t->next = t->prev = NULL;
 299   local_irq_restore(flags);
 300   return ret;
 301 } /* del_fast_timer */
 302
 303
 304 /* Interrupt routines or functions called in interrupt context */
 305
 306 /* Timer interrupt handler for trig interrupts */
 307
 308 static irqreturn_t
 309 timer_trig_interrupt(int irq, void *dev_id)
 310 {
 311   reg_timer_r_masked_intr masked_intr;
 312   /* Check if the timer interrupt is for us (a trig int) */
 313         masked_intr = REG_RD(timer, regi_timer0, r_masked_intr);
 314   if (!masked_intr.trig)
 315     return IRQ_NONE;
 316         timer_trig_handler(NULL);
 317   return IRQ_HANDLED;
 318 }
 319
 320 static void timer_trig_handler(struct work_struct *work)
 321 {
 322         reg_timer_rw_ack_intr ack_intr = { 0 };
 323         reg_timer_rw_intr_mask intr_mask;
 324         reg_timer_rw_trig_cfg trig_cfg = { 0 };
 325         struct fast_timer *t;
 326         fast_timer_function_type *f;
 327         unsigned long d;
 328         unsigned long flags;
 329
 330         /* We keep interrupts disabled not only when we modify the
 331          * fast timer list, but any time we hold a reference to a
 332          * timer in the list, since del_fast_timer may be called
 333          * from (another) interrupt context.  Thus, the only time
 334          * when interrupts are enabled is when calling the timer
 335          * callback function.
 336          */
 337   local_irq_save(flags);
 338
 339   /* Clear timer trig interrupt */
 340         intr_mask = REG_RD(timer, regi_timer0, rw_intr_mask);
 341   intr_mask.trig = 0;
 342   REG_WR(timer, regi_timer0, rw_intr_mask, intr_mask);
 343
 344   /* First stop timer, then ack interrupt */
 345   /* Stop timer */
 346   trig_cfg.tmr = regk_timer_off;
 347         REG_WR(timer, regi_timer0, rw_trig_cfg, trig_cfg);
 348
 349   /* Ack interrupt */
 350   ack_intr.trig = 1;
 351         REG_WR(timer, regi_timer0, rw_ack_intr, ack_intr);
 352
 353   fast_timer_running = 0;
 354   fast_timer_ints++;
 355
 356   t = fast_timer_list;
 357         while (t) {
 358                 struct fasttime_t tv;
 359
 360     /* Has it really expired? */
 361     do_gettimeofday_fast(&tv);
 362                 D1(printk(KERN_DEBUG
 363                         "t: %is %06ius\n", tv.tv_jiff, tv.tv_usec));
 364
 365                 if (fasttime_cmp(&t->tv_expires, &tv) <= 0) {
 366       /* Yes it has expired */
 367 #ifdef FAST_TIMER_LOG
 368       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 369 #endif
 370       fast_timers_expired++;
 371
 372       /* Remove this timer before call, since it may reuse the timer */
 373       if (t->prev)
 374         t->prev->next = t->next;
 375       else
 376         fast_timer_list = t->next;
 377       if (t->next)
 378         t->next->prev = t->prev;
 379       t->prev = NULL;
 380       t->next = NULL;
 381
 382                         /* Save function callback data before enabling
 383                          * interrupts, since the timer may be removed and we
 384                          * don't know how it was allocated (e.g. ->function
 385                          * and ->data may become overwritten after deletion
 386                          * if the timer was stack-allocated).
 387                          */
 388                         f = t->function;
 389                         d = t->data;
 390
 391                         if (f != NULL) {
 392                                 /* Run the callback function with interrupts
 393                                  * enabled. */
 394                                 local_irq_restore(flags);
 395                                 f(d);
 396                                 local_irq_save(flags);
 397                         } else
 398         DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
 399                 } else {
 400       /* Timer is to early, let's set it again using the normal routines */
 401       D1(printk(".\n"));
 402     }
 403
 404                 t = fast_timer_list;
 405                 if (t != NULL) {
 406       /* Start next timer.. */
 407                         long us = 0;
 408                         struct fasttime_t tv;
 409
 410       do_gettimeofday_fast(&tv);
 411
 412                         /* time_after_eq takes care of wrapping */
 413                         if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
 414                                 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
 415                                         1000000 / HZ + t->tv_expires.tv_usec -
 416                                         tv.tv_usec);
 417
 418                         if (us > 0) {
 419                                 if (!fast_timer_running) {
 420 #ifdef FAST_TIMER_LOG
 421           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 422 #endif
 423           start_timer_trig(us);
 424         }
 425         break;
 426                         } else {
 427         /* Timer already expired, let's handle it better late than never.
 428          * The normal loop handles it
 429          */
 430         D1(printk("e! %d\n", us));
 431       }
 432     }
 433   }
 434
 435         local_irq_restore(flags);
 436
 437         if (!t)
 438     D1(printk("ttrig stop!\n"));
 439 }
 440
 441 static void wake_up_func(unsigned long data)
 442 {
 443   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 444   wake_up(sleep_wait_p);
 445 }
 446
 447
 448 /* Useful API */
 449
 450 void schedule_usleep(unsigned long us)
 451 {
 452   struct fast_timer t;
 453   wait_queue_head_t sleep_wait;
 454   init_waitqueue_head(&sleep_wait);
 455
 456   D1(printk("schedule_usleep(%d)\n", us));
 457   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 458                        "usleep");
 459         /* Uninterruptible sleep on the fast timer. (The condition is
 460          * somewhat redundant since the timer is what wakes us up.) */
 461         wait_event(sleep_wait, !fast_timer_pending(&t));
 462
 463   D1(printk("done schedule_usleep(%d)\n", us));
 464 }
 465
 466 #ifdef CONFIG_PROC_FS
 467 /* This value is very much based on testing */
 468 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 469
 470 static int proc_fasttimer_show(struct seq_file *m, void *v)
 471 {
 472         unsigned long flags;
 473         int i = 0;
 474         int num_to_show;
 475         struct fasttime_t tv;
 476         struct fast_timer *t, *nextt;
 477
 478         do_gettimeofday_fast(&tv);
 479
 480         seq_printf(m, "Fast timers added:     %i\n", fast_timers_added);
 481         seq_printf(m, "Fast timers started:   %i\n", fast_timers_started);
 482         seq_printf(m, "Fast timer interrupts: %i\n", fast_timer_ints);
 483         seq_printf(m, "Fast timers expired:   %i\n", fast_timers_expired);
 484         seq_printf(m, "Fast timers deleted:   %i\n", fast_timers_deleted);
 485         seq_printf(m, "Fast timer running:    %s\n",
 486                    fast_timer_running ? "yes" : "no");
 487         seq_printf(m, "Current time:          %lu.%06lu\n",
 488                    (unsigned long)tv.tv_jiff,
 489                    (unsigned long)tv.tv_usec);
 490 #ifdef FAST_TIMER_SANITY_CHECKS
 491         seq_printf(m, "Sanity failed:         %i\n", sanity_failed);
 492 #endif
 493         seq_putc(m, '\n');
 494
 495 #ifdef DEBUG_LOG_INCLUDED
 496         {
 497                 int end_i = debug_log_cnt;
 498                 i = 0;
 499
 500                 if (debug_log_cnt_wrapped)
 501                         i = debug_log_cnt;
 502
 503                 while ((i != end_i || debug_log_cnt_wrapped)) {
 504                         seq_printf(m, debug_log_string[i], debug_log_value[i]);
 505                         if (seq_has_overflowed(m))
 506                                 return 0;
 507                         i = (i+1) % DEBUG_LOG_MAX;
 508                 }
 509         }
 510         seq_putc(m, '\n');
 511 #endif
 512
 513         num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 514                        NUM_TIMER_STATS);
 515         seq_printf(m, "Timers started: %i\n", fast_timers_started);
 516         for (i = 0; i < num_to_show; i++) {
 517                 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 518
 519 #if 1 //ndef FAST_TIMER_LOG
 520                 seq_printf(m, "div: %i delay: %i\n",
 521                            timer_div_settings[cur],
 522                            timer_delay_settings[cur]);
 523 #endif
 524 #ifdef FAST_TIMER_LOG
 525                 t = &timer_started_log[cur];
 526                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 527                            t->name,
 528                            (unsigned long)t->tv_set.tv_jiff,
 529                            (unsigned long)t->tv_set.tv_usec,
 530                            (unsigned long)t->tv_expires.tv_jiff,
 531                            (unsigned long)t->tv_expires.tv_usec,
 532                            t->delay_us,
 533                            t->data);
 534                 if (seq_has_overflowed(m))
 535                         return 0;
 536 #endif
 537         }
 538         seq_putc(m, '\n');
 539
 540 #ifdef FAST_TIMER_LOG
 541         num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 542                        NUM_TIMER_STATS);
 543         seq_printf(m, "Timers added: %i\n", fast_timers_added);
 544         for (i = 0; i < num_to_show; i++) {
 545                 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 546                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 547                            t->name,
 548                            (unsigned long)t->tv_set.tv_jiff,
 549                            (unsigned long)t->tv_set.tv_usec,
 550                            (unsigned long)t->tv_expires.tv_jiff,
 551                            (unsigned long)t->tv_expires.tv_usec,
 552                            t->delay_us,
 553                            t->data);
 554                 if (seq_has_overflowed(m))
 555                         return 0;
 556         }
 557         seq_putc(m, '\n');
 558
 559         num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 560                        NUM_TIMER_STATS);
 561         seq_printf(m, "Timers expired: %i\n", fast_timers_expired);
 562         for (i = 0; i < num_to_show; i++){
 563                 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 564                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 565                            t->name,
 566                            (unsigned long)t->tv_set.tv_jiff,
 567                            (unsigned long)t->tv_set.tv_usec,
 568                            (unsigned long)t->tv_expires.tv_jiff,
 569                            (unsigned long)t->tv_expires.tv_usec,
 570                            t->delay_us,
 571                            t->data);
 572                 if (seq_has_overflowed(m))
 573                         return 0;
 574         }
 575         seq_putc(m, '\n');
 576 #endif
 577
 578         seq_puts(m, "Active timers:\n");
 579         local_irq_save(flags);
 580         t = fast_timer_list;
 581         while (t != NULL){
 582                 nextt = t->next;
 583                 local_irq_restore(flags);
 584                 seq_printf(m, "%-14s s: %6lu.%06lu e: %6lu.%06lu d: %6li us data: 0x%08lX\n",
 585                            t->name,
 586                            (unsigned long)t->tv_set.tv_jiff,
 587                            (unsigned long)t->tv_set.tv_usec,
 588                            (unsigned long)t->tv_expires.tv_jiff,
 589                            (unsigned long)t->tv_expires.tv_usec,
 590                            t->delay_us,
 591                            t->data);
 592                 if (seq_has_overflowed(m))
 593                         return 0;
 594                 local_irq_save(flags);
 595                 if (t->next != nextt)
 596                         printk("timer removed!\n");
 597                 t = nextt;
 598         }
 599         local_irq_restore(flags);
 600         return 0;
 601 }
 602
 603 static int proc_fasttimer_open(struct inode *inode, struct file *file)
 604 {
 605         return single_open_size(file, proc_fasttimer_show, PDE_DATA(inode), BIG_BUF_SIZE);
 606 }
 607
 608 static const struct file_operations proc_fasttimer_fops = {
 609         .open           = proc_fasttimer_open,
 610         .read           = seq_read,
 611         .llseek         = seq_lseek,
 612         .release        = single_release,
 613 };
 614
 615 #endif /* PROC_FS */
 616
 617 #ifdef FAST_TIMER_TEST
 618 static volatile unsigned long i = 0;
 619 static volatile int num_test_timeout = 0;
 620 static struct fast_timer tr[10];
 621 static int exp_num[10];
 622
 623 static struct fasttime_t tv_exp[100];
 624
 625 static void test_timeout(unsigned long data)
 626 {
 627   do_gettimeofday_fast(&tv_exp[data]);
 628   exp_num[data] = num_test_timeout;
 629
 630   num_test_timeout++;
 631 }
 632
 633 static void test_timeout1(unsigned long data)
 634 {
 635   do_gettimeofday_fast(&tv_exp[data]);
 636   exp_num[data] = num_test_timeout;
 637   if (data < 7)
 638   {
 639     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 640     i++;
 641   }
 642   num_test_timeout++;
 643 }
 644
 645 DP(
 646 static char buf0[2000];
 647 static char buf1[2000];
 648 static char buf2[2000];
 649 static char buf3[2000];
 650 static char buf4[2000];
 651 );
 652
 653 static char buf5[6000];
 654 static int j_u[1000];
 655
 656 static void fast_timer_test(void)
 657 {
 658   int prev_num;
 659   int j;
 660
 661         struct fasttime_t tv, tv0, tv1, tv2;
 662
 663   printk("fast_timer_test() start\n");
 664   do_gettimeofday_fast(&tv);
 665
 666   for (j = 0; j < 1000; j++)
 667   {
 668     j_u[j] = GET_JIFFIES_USEC();
 669   }
 670   for (j = 0; j < 100; j++)
 671   {
 672     do_gettimeofday_fast(&tv_exp[j]);
 673   }
 674   printk(KERN_DEBUG "fast_timer_test() %is %06i\n", tv.tv_jiff, tv.tv_usec);
 675
 676   for (j = 0; j < 1000; j++)
 677   {
 678     printk(KERN_DEBUG "%i %i %i %i %i\n",
 679       j_u[j], j_u[j+1], j_u[j+2], j_u[j+3], j_u[j+4]);
 680     j += 4;
 681   }
 682   for (j = 0; j < 100; j++)
 683   {
 684     printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 685                         tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
 686                         tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
 687                         tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
 688                         tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
 689                         tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
 690     j += 4;
 691   }
 692   do_gettimeofday_fast(&tv0);
 693   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 694   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 695   i++;
 696   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 697   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 698   i++;
 699   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 700   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 701   i++;
 702   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 703   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 704   i++;
 705   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 706   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 707   i++;
 708   do_gettimeofday_fast(&tv1);
 709
 710   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 711
 712   prev_num = num_test_timeout;
 713   while (num_test_timeout < i)
 714   {
 715     if (num_test_timeout != prev_num)
 716       prev_num = num_test_timeout;
 717   }
 718   do_gettimeofday_fast(&tv2);
 719         printk(KERN_INFO "Timers started    %is %06i\n",
 720                 tv0.tv_jiff, tv0.tv_usec);
 721         printk(KERN_INFO "Timers started at %is %06i\n",
 722                 tv1.tv_jiff, tv1.tv_usec);
 723         printk(KERN_INFO "Timers done       %is %06i\n",
 724                 tv2.tv_jiff, tv2.tv_usec);
 725   DP(printk("buf0:\n");
 726      printk(buf0);
 727      printk("buf1:\n");
 728      printk(buf1);
 729      printk("buf2:\n");
 730      printk(buf2);
 731      printk("buf3:\n");
 732      printk(buf3);
 733      printk("buf4:\n");
 734      printk(buf4);
 735   );
 736   printk("buf5:\n");
 737   printk(buf5);
 738
 739   printk("timers set:\n");
 740   for(j = 0; j<i; j++)
 741   {
 742     struct fast_timer *t = &tr[j];
 743     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 744            "data: 0x%08X func: 0x%08X\n",
 745            t->name,
 746                         t->tv_set.tv_jiff,
 747            t->tv_set.tv_usec,
 748                         t->tv_expires.tv_jiff,
 749            t->tv_expires.tv_usec,
 750            t->data,
 751            t->function
 752            );
 753
 754     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 755            t->delay_us,
 756                         tv_exp[j].tv_jiff,
 757            tv_exp[j].tv_usec,
 758            exp_num[j],
 759                         (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
 760                                 1000000 + tv_exp[j].tv_usec -
 761                                 t->tv_expires.tv_usec);
 762   }
 763   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 764   printk("buf5 after all done:\n");
 765   printk(buf5);
 766   printk("fast_timer_test() done\n");
 767 }
 768 #endif
 769
 770
 771 int fast_timer_init(void)
 772 {
 773   /* For some reason, request_irq() hangs when called froom time_init() */
 774   if (!fast_timer_is_init)
 775   {
 776     printk("fast_timer_init()\n");
 777
 778 #ifdef CONFIG_PROC_FS
 779     proc_create("fasttimer", 0, NULL, &proc_fasttimer_fops);
 780 #endif /* PROC_FS */
 781                 if (request_irq(TIMER0_INTR_VECT, timer_trig_interrupt,
 782                                 IRQF_SHARED,
 783                                 "fast timer int", &fast_timer_list))
 784                         printk(KERN_ERR "err: fasttimer irq\n");
 785     fast_timer_is_init = 1;
 786 #ifdef FAST_TIMER_TEST
 787     printk("do test\n");
 788     fast_timer_test();
 789 #endif
 790   }
 791         return 0;
 792 }
 793 __initcall(fast_timer_init);