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

   1 /* $Id: fasttimer.c,v 1.6 2004/05/14 10:18:39 starvik Exp $
   2  * linux/arch/cris/kernel/fasttimer.c
   3  *
   4  * Fast timers for ETRAX100/ETRAX100LX
   5  * This may be useful in other OS than Linux so use 2 space indentation...
   6  *
   7  * $Log: fasttimer.c,v $
   8  * Revision 1.6  2004/05/14 10:18:39  starvik
   9  * Export fast_timer_list
  10  *
  11  * Revision 1.5  2004/05/14 07:58:01  starvik
  12  * Merge of changes from 2.4
  13  *
  14  * Revision 1.4  2003/07/04 08:27:41  starvik
  15  * Merge of Linux 2.5.74
  16  *
  17  * Revision 1.3  2002/12/12 08:26:32  starvik
  18  * Don't use C-comments inside CVS comments
  19  *
  20  * Revision 1.2  2002/12/11 15:42:02  starvik
  21  * Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/
  22  *
  23  * Revision 1.1  2002/11/18 07:58:06  starvik
  24  * Fast timers (from Linux 2.4)
  25  *
  26  * Revision 1.5  2002/10/15 06:21:39  starvik
  27  * Added call to init_waitqueue_head
  28  *
  29  * Revision 1.4  2002/05/28 17:47:59  johana
  30  * Added del_fast_timer()
  31  *
  32  * Revision 1.3  2002/05/28 16:16:07  johana
  33  * Handle empty fast_timer_list
  34  *
  35  * Revision 1.2  2002/05/27 15:38:42  johana
  36  * Made it compile without warnings on Linux 2.4.
  37  * (includes, wait_queue, PROC_FS and snprintf)
  38  *
  39  * Revision 1.1  2002/05/27 15:32:25  johana
  40  * arch/etrax100/kernel/fasttimer.c v1.8 from the elinux tree.
  41  *
  42  * Revision 1.8  2001/11/27 13:50:40  pkj
  43  * Disable interrupts while stopping the timer and while modifying the
  44  * list of active timers in timer1_handler() as it may be interrupted
  45  * by other interrupts (e.g., the serial interrupt) which may add fast
  46  * timers.
  47  *
  48  * Revision 1.7  2001/11/22 11:50:32  pkj
  49  * * Only store information about the last 16 timers.
  50  * * proc_fasttimer_read() now uses an allocated buffer, since it
  51  *   requires more space than just a page even for only writing the
  52  *   last 16 timers. The buffer is only allocated on request, so
  53  *   unless /proc/fasttimer is read, it is never allocated.
  54  * * Renamed fast_timer_started to fast_timers_started to match
  55  *   fast_timers_added and fast_timers_expired.
  56  * * Some clean-up.
  57  *
  58  * Revision 1.6  2000/12/13 14:02:08  johana
  59  * Removed volatile for fast_timer_list
  60  *
  61  * Revision 1.5  2000/12/13 13:55:35  johana
  62  * Added DEBUG_LOG, added som cli() and cleanup
  63  *
  64  * Revision 1.4  2000/12/05 13:48:50  johana
  65  * Added range check when writing proc file, modified timer int handling
  66  *
  67  * Revision 1.3  2000/11/23 10:10:20  johana
  68  * More debug/logging possibilities.
  69  * Moved GET_JIFFIES_USEC() to timex.h and time.c
  70  *
  71  * Revision 1.2  2000/11/01 13:41:04  johana
  72  * Clean up and bugfixes.
  73  * Created new do_gettimeofday_fast() that gets a timeval struct
  74  * with time based on jiffies and *R_TIMER0_DATA, uses a table
  75  * for fast conversion of timer value to microseconds.
  76  * (Much faster the standard do_gettimeofday() and we don't really
  77  * wan't to use the true time - we wan't the "uptime" so timers don't screw up
  78  * when we change the time.
  79  * TODO: Add efficient support for continuous timers as well.
  80  *
  81  * Revision 1.1  2000/10/26 15:49:16  johana
  82  * Added fasttimer, highresolution timers.
  83  *
  84  * Copyright (C) 2000,2001 2002 Axis Communications AB, Lund, Sweden
  85  */
  86
  87 #include <linux/errno.h>
  88 #include <linux/sched.h>
  89 #include <linux/kernel.h>
  90 #include <linux/param.h>
  91 #include <linux/string.h>
  92 #include <linux/mm.h>
  93 #include <linux/vmalloc.h>
  94 #include <linux/interrupt.h>
  95 #include <linux/time.h>
  96 #include <linux/delay.h>
  97
  98 #include <asm/segment.h>
  99 #include <asm/io.h>
 100 #include <asm/irq.h>
 101 #include <asm/delay.h>
 102 #include <asm/rtc.h>
 103
 104 #include <linux/config.h>
 105 #include <linux/version.h>
 106
 107 #include <asm/arch/svinto.h>
 108 #include <asm/fasttimer.h>
 109 #include <linux/proc_fs.h>
 110
 111
 112 #define DEBUG_LOG_INCLUDED
 113 #define FAST_TIMER_LOG
 114 //#define FAST_TIMER_TEST
 115
 116 #define FAST_TIMER_SANITY_CHECKS
 117
 118 #ifdef FAST_TIMER_SANITY_CHECKS
 119 #define SANITYCHECK(x) x
 120 static int sanity_failed = 0;
 121 #else
 122 #define SANITYCHECK(x)
 123 #endif
 124
 125 #define D1(x)
 126 #define D2(x)
 127 #define DP(x)
 128
 129 #define __INLINE__ inline
 130
 131 static int fast_timer_running = 0;
 132 static int fast_timers_added = 0;
 133 static int fast_timers_started = 0;
 134 static int fast_timers_expired = 0;
 135 static int fast_timers_deleted = 0;
 136 static int fast_timer_is_init = 0;
 137 static int fast_timer_ints = 0;
 138
 139 struct fast_timer *fast_timer_list = NULL;
 140
 141 #ifdef DEBUG_LOG_INCLUDED
 142 #define DEBUG_LOG_MAX 128
 143 static const char * debug_log_string[DEBUG_LOG_MAX];
 144 static unsigned long debug_log_value[DEBUG_LOG_MAX];
 145 static int debug_log_cnt = 0;
 146 static int debug_log_cnt_wrapped = 0;
 147
 148 #define DEBUG_LOG(string, value) \
 149 { \
 150   unsigned long log_flags; \
 151   save_flags(log_flags); \
 152   cli(); \
 153   debug_log_string[debug_log_cnt] = (string); \
 154   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
 155   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
 156   { \
 157     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
 158     debug_log_cnt_wrapped = 1; \
 159   } \
 160   restore_flags(log_flags); \
 161 }
 162 #else
 163 #define DEBUG_LOG(string, value)
 164 #endif
 165
 166
 167 /* The frequencies for index = clkselx number in R_TIMER_CTRL */
 168 #define NUM_TIMER_FREQ 15
 169 #define MAX_USABLE_TIMER_FREQ 7
 170 #define MAX_DELAY_US  853333L
 171 const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
 172 {
 173   3,   /* 0 3333 - 853333 us */
 174   6,   /* 1 1666 - 426666 us */
 175   12,  /* 2  833 - 213333 us */
 176   24,  /* 3  416 - 106666 us */
 177   48,  /* 4  208 -  53333 us */
 178   96,  /* 5  104 -  26666 us */
 179   192, /* 6   52 -  13333 us */
 180   384, /* 7   26 -   6666 us */
 181   576,
 182   1152,
 183   2304,
 184   4608,
 185   9216,
 186   18432,
 187   62500,
 188   /* 15 = cascade */
 189 };
 190 #define NUM_TIMER_STATS 16
 191 #ifdef FAST_TIMER_LOG
 192 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 193 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 194 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 195 #endif
 196
 197 int timer_div_settings[NUM_TIMER_STATS];
 198 int timer_freq_settings[NUM_TIMER_STATS];
 199 int timer_delay_settings[NUM_TIMER_STATS];
 200
 201 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 202 void __INLINE__ do_gettimeofday_fast(struct timeval *tv)
 203 {
 204   unsigned long sec = jiffies;
 205   unsigned long usec = GET_JIFFIES_USEC();
 206
 207   usec += (sec % HZ) * (1000000 / HZ);
 208   sec = sec / HZ;
 209
 210   if (usec > 1000000)
 211   {
 212     usec -= 1000000;
 213     sec++;
 214   }
 215   tv->tv_sec = sec;
 216   tv->tv_usec = usec;
 217 }
 218
 219 int __INLINE__ timeval_cmp(struct timeval *t0, struct timeval *t1)
 220 {
 221   if (t0->tv_sec < t1->tv_sec)
 222   {
 223     return -1;
 224   }
 225   else if (t0->tv_sec > t1->tv_sec)
 226   {
 227     return 1;
 228   }
 229   if (t0->tv_usec < t1->tv_usec)
 230   {
 231     return -1;
 232   }
 233   else if (t0->tv_usec > t1->tv_usec)
 234   {
 235     return 1;
 236   }
 237   return 0;
 238 }
 239
 240 void __INLINE__ start_timer1(unsigned long delay_us)
 241 {
 242   int freq_index = 0; /* This is the lowest resolution */
 243   unsigned long upper_limit = MAX_DELAY_US;
 244
 245   unsigned long div;
 246   /* Start/Restart the timer to the new shorter value */
 247   /* t = 1/freq = 1/19200 = 53us
 248    * T=div*t,  div = T/t = delay_us*freq/1000000
 249    */
 250 #if 1 /* Adaptive timer settings */
 251   while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
 252   {
 253     freq_index++;
 254     upper_limit >>= 1; /* Divide by 2 using shift */
 255   }
 256   if (freq_index > 0)
 257   {
 258     freq_index--;
 259   }
 260 #else
 261   freq_index = 6;
 262 #endif
 263   div = delay_us * timer_freq_100[freq_index]/10000;
 264   if (div < 2)
 265   {
 266     /* Maybe increase timer freq? */
 267     div = 2;
 268   }
 269   if (div > 255)
 270   {
 271     div = 0; /* This means 256, the max the timer takes */
 272     /* If a longer timeout than the timer can handle is used,
 273      * then we must restart it when it goes off.
 274      */
 275   }
 276
 277   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
 278   timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
 279   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 280
 281   D1(printk("start_timer1 : %d us freq: %i div: %i\n",
 282             delay_us, freq_index, div));
 283   /* Clear timer1 irq */
 284   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 285
 286   /* Set timer values */
 287   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 288     (r_timer_ctrl_shadow &
 289      ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
 290      ~IO_MASK(R_TIMER_CTRL, tm1) &
 291      ~IO_MASK(R_TIMER_CTRL, clksel1)) |
 292     IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
 293     IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
 294     IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
 295
 296   /* Ack interrupt */
 297   *R_TIMER_CTRL =  r_timer_ctrl_shadow |
 298     IO_STATE(R_TIMER_CTRL, i1, clr);
 299
 300   /* Start timer */
 301   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 302     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 303     IO_STATE(R_TIMER_CTRL, tm1, run);
 304
 305   /* Enable timer1 irq */
 306   *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
 307   fast_timers_started++;
 308   fast_timer_running = 1;
 309 }
 310
 311 /* In version 1.4 this function takes 27 - 50 us */
 312 void start_one_shot_timer(struct fast_timer *t,
 313                           fast_timer_function_type *function,
 314                           unsigned long data,
 315                           unsigned long delay_us,
 316                           const char *name)
 317 {
 318   unsigned long flags;
 319   struct fast_timer *tmp;
 320
 321   D1(printk("sft %s %d us\n", name, delay_us));
 322
 323   save_flags(flags);
 324   cli();
 325
 326   do_gettimeofday_fast(&t->tv_set);
 327   tmp = fast_timer_list;
 328
 329   SANITYCHECK({ /* Check so this is not in the list already... */
 330     while (tmp != NULL)
 331     {
 332       if (tmp == t)
 333       {
 334         printk(KERN_WARNING
 335                "timer name: %s data: 0x%08lX already in list!\n", name, data);
 336         sanity_failed++;
 337         return;
 338       }
 339       else
 340       {
 341         tmp = tmp->next;
 342       }
 343     }
 344     tmp = fast_timer_list;
 345   });
 346
 347   t->delay_us = delay_us;
 348   t->function = function;
 349   t->data = data;
 350   t->name = name;
 351
 352   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 353   t->tv_expires.tv_sec  = t->tv_set.tv_sec  + delay_us / 1000000;
 354   if (t->tv_expires.tv_usec > 1000000)
 355   {
 356     t->tv_expires.tv_usec -= 1000000;
 357     t->tv_expires.tv_sec++;
 358   }
 359 #ifdef FAST_TIMER_LOG
 360   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 361 #endif
 362   fast_timers_added++;
 363
 364   /* Check if this should timeout before anything else */
 365   if (tmp == NULL || timeval_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 366   {
 367     /* Put first in list and modify the timer value */
 368     t->prev = NULL;
 369     t->next = fast_timer_list;
 370     if (fast_timer_list)
 371     {
 372       fast_timer_list->prev = t;
 373     }
 374     fast_timer_list = t;
 375 #ifdef FAST_TIMER_LOG
 376     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 377 #endif
 378     start_timer1(delay_us);
 379   } else {
 380     /* Put in correct place in list */
 381     while (tmp->next &&
 382            timeval_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 383     {
 384       tmp = tmp->next;
 385     }
 386     /* Insert t after tmp */
 387     t->prev = tmp;
 388     t->next = tmp->next;
 389     if (tmp->next)
 390     {
 391       tmp->next->prev = t;
 392     }
 393     tmp->next = t;
 394   }
 395
 396   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 397
 398   restore_flags(flags);
 399 } /* start_one_shot_timer */
 400
 401 static inline int fast_timer_pending (const struct fast_timer * t)
 402 {
 403   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 404 }
 405
 406 static inline int detach_fast_timer (struct fast_timer *t)
 407 {
 408   struct fast_timer *next, *prev;
 409   if (!fast_timer_pending(t))
 410     return 0;
 411   next = t->next;
 412   prev = t->prev;
 413   if (next)
 414     next->prev = prev;
 415   if (prev)
 416     prev->next = next;
 417   else
 418     fast_timer_list = next;
 419   fast_timers_deleted++;
 420   return 1;
 421 }
 422
 423 int del_fast_timer(struct fast_timer * t)
 424 {
 425   unsigned long flags;
 426   int ret;
 427
 428   save_flags(flags);
 429   cli();
 430   ret = detach_fast_timer(t);
 431   t->next = t->prev = NULL;
 432   restore_flags(flags);
 433   return ret;
 434 } /* del_fast_timer */
 435
 436
 437 /* Interrupt routines or functions called in interrupt context */
 438
 439 /* Timer 1 interrupt handler */
 440
 441 static irqreturn_t
 442 timer1_handler(int irq, void *dev_id, struct pt_regs *regs)
 443 {
 444   struct fast_timer *t;
 445   unsigned long flags;
 446
 447   save_flags(flags);
 448   cli();
 449
 450   /* Clear timer1 irq */
 451   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 452
 453   /* First stop timer, then ack interrupt */
 454   /* Stop timer */
 455   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 456     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 457     IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
 458
 459   /* Ack interrupt */
 460   *R_TIMER_CTRL =  r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
 461
 462   fast_timer_running = 0;
 463   fast_timer_ints++;
 464
 465   restore_flags(flags);
 466
 467   t = fast_timer_list;
 468   while (t)
 469   {
 470     struct timeval tv;
 471
 472     /* Has it really expired? */
 473     do_gettimeofday_fast(&tv);
 474     D1(printk("t: %is %06ius\n", tv.tv_sec, tv.tv_usec));
 475
 476     if (timeval_cmp(&t->tv_expires, &tv) <= 0)
 477     {
 478       /* Yes it has expired */
 479 #ifdef FAST_TIMER_LOG
 480       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 481 #endif
 482       fast_timers_expired++;
 483
 484       /* Remove this timer before call, since it may reuse the timer */
 485       save_flags(flags);
 486       cli();
 487       if (t->prev)
 488       {
 489         t->prev->next = t->next;
 490       }
 491       else
 492       {
 493         fast_timer_list = t->next;
 494       }
 495       if (t->next)
 496       {
 497         t->next->prev = t->prev;
 498       }
 499       t->prev = NULL;
 500       t->next = NULL;
 501       restore_flags(flags);
 502
 503       if (t->function != NULL)
 504       {
 505         t->function(t->data);
 506       }
 507       else
 508       {
 509         DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
 510       }
 511     }
 512     else
 513     {
 514       /* Timer is to early, let's set it again using the normal routines */
 515       D1(printk(".\n"));
 516     }
 517
 518     save_flags(flags);
 519     cli();
 520     if ((t = fast_timer_list) != NULL)
 521     {
 522       /* Start next timer.. */
 523       long us;
 524       struct timeval tv;
 525
 526       do_gettimeofday_fast(&tv);
 527       us = ((t->tv_expires.tv_sec - tv.tv_sec) * 1000000 +
 528             t->tv_expires.tv_usec - tv.tv_usec);
 529       if (us > 0)
 530       {
 531         if (!fast_timer_running)
 532         {
 533 #ifdef FAST_TIMER_LOG
 534           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 535 #endif
 536           start_timer1(us);
 537         }
 538         restore_flags(flags);
 539         break;
 540       }
 541       else
 542       {
 543         /* Timer already expired, let's handle it better late than never.
 544          * The normal loop handles it
 545          */
 546         D1(printk("e! %d\n", us));
 547       }
 548     }
 549     restore_flags(flags);
 550   }
 551
 552   if (!t)
 553   {
 554     D1(printk("t1 stop!\n"));
 555   }
 556
 557   return IRQ_HANDLED;
 558 }
 559
 560 static void wake_up_func(unsigned long data)
 561 {
 562 #ifdef DECLARE_WAITQUEUE
 563   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 564 #else
 565   struct wait_queue **sleep_wait_p = (struct wait_queue **)data;
 566 #endif
 567   wake_up(sleep_wait_p);
 568 }
 569
 570
 571 /* Useful API */
 572
 573 void schedule_usleep(unsigned long us)
 574 {
 575   struct fast_timer t;
 576 #ifdef DECLARE_WAITQUEUE
 577   wait_queue_head_t sleep_wait;
 578   init_waitqueue_head(&sleep_wait);
 579   {
 580   DECLARE_WAITQUEUE(wait, current);
 581 #else
 582   struct wait_queue *sleep_wait = NULL;
 583   struct wait_queue wait = { current, NULL };
 584 #endif
 585
 586   D1(printk("schedule_usleep(%d)\n", us));
 587   add_wait_queue(&sleep_wait, &wait);
 588   set_current_state(TASK_INTERRUPTIBLE);
 589   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 590                        "usleep");
 591   schedule();
 592   set_current_state(TASK_RUNNING);
 593   remove_wait_queue(&sleep_wait, &wait);
 594   D1(printk("done schedule_usleep(%d)\n", us));
 595 #ifdef DECLARE_WAITQUEUE
 596   }
 597 #endif
 598 }
 599
 600 #ifdef CONFIG_PROC_FS
 601 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 602                        ,int *eof, void *data_unused);
 603 static struct proc_dir_entry *fasttimer_proc_entry;
 604 #endif /* CONFIG_PROC_FS */
 605
 606 #ifdef CONFIG_PROC_FS
 607
 608 /* This value is very much based on testing */
 609 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 610
 611 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 612                        ,int *eof, void *data_unused)
 613 {
 614   unsigned long flags;
 615   int i = 0;
 616   int num_to_show;
 617   struct timeval tv;
 618   struct fast_timer *t, *nextt;
 619   static char *bigbuf = NULL;
 620   static unsigned long used;
 621
 622   if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE)))
 623   {
 624     used = 0;
 625     bigbuf[0] = '\0';
 626     return 0;
 627   }
 628
 629   if (!offset || !used)
 630   {
 631     do_gettimeofday_fast(&tv);
 632
 633     used = 0;
 634     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 635                     fast_timers_added);
 636     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 637                     fast_timers_started);
 638     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 639                     fast_timer_ints);
 640     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 641                     fast_timers_expired);
 642     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 643                     fast_timers_deleted);
 644     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 645                     fast_timer_running ? "yes" : "no");
 646     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 647                     (unsigned long)tv.tv_sec,
 648                     (unsigned long)tv.tv_usec);
 649 #ifdef FAST_TIMER_SANITY_CHECKS
 650     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 651                     sanity_failed);
 652 #endif
 653     used += sprintf(bigbuf + used, "\n");
 654
 655 #ifdef DEBUG_LOG_INCLUDED
 656     {
 657       int end_i = debug_log_cnt;
 658       i = 0;
 659
 660       if (debug_log_cnt_wrapped)
 661       {
 662         i = debug_log_cnt;
 663       }
 664
 665       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 666              used+100 < BIG_BUF_SIZE)
 667       {
 668         used += sprintf(bigbuf + used, debug_log_string[i],
 669                         debug_log_value[i]);
 670         i = (i+1) % DEBUG_LOG_MAX;
 671       }
 672     }
 673     used += sprintf(bigbuf + used, "\n");
 674 #endif
 675
 676     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 677                    NUM_TIMER_STATS);
 678     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 679     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 680     {
 681       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 682
 683 #if 1 //ndef FAST_TIMER_LOG
 684       used += sprintf(bigbuf + used, "div: %i freq: %i delay: %i"
 685                       "\n",
 686                       timer_div_settings[cur],
 687                       timer_freq_settings[cur],
 688                       timer_delay_settings[cur]
 689                       );
 690 #endif
 691 #ifdef FAST_TIMER_LOG
 692       t = &timer_started_log[cur];
 693       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 694                       "d: %6li us data: 0x%08lX"
 695                       "\n",
 696                       t->name,
 697                       (unsigned long)t->tv_set.tv_sec,
 698                       (unsigned long)t->tv_set.tv_usec,
 699                       (unsigned long)t->tv_expires.tv_sec,
 700                       (unsigned long)t->tv_expires.tv_usec,
 701                       t->delay_us,
 702                       t->data
 703                       );
 704 #endif
 705     }
 706     used += sprintf(bigbuf + used, "\n");
 707
 708 #ifdef FAST_TIMER_LOG
 709     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 710                    NUM_TIMER_STATS);
 711     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 712     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 713     {
 714       t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 715       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 716                       "d: %6li us data: 0x%08lX"
 717                       "\n",
 718                       t->name,
 719                       (unsigned long)t->tv_set.tv_sec,
 720                       (unsigned long)t->tv_set.tv_usec,
 721                       (unsigned long)t->tv_expires.tv_sec,
 722                       (unsigned long)t->tv_expires.tv_usec,
 723                       t->delay_us,
 724                       t->data
 725                       );
 726     }
 727     used += sprintf(bigbuf + used, "\n");
 728
 729     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 730                    NUM_TIMER_STATS);
 731     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 732     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 733     {
 734       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 735       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 736                       "d: %6li us data: 0x%08lX"
 737                       "\n",
 738                       t->name,
 739                       (unsigned long)t->tv_set.tv_sec,
 740                       (unsigned long)t->tv_set.tv_usec,
 741                       (unsigned long)t->tv_expires.tv_sec,
 742                       (unsigned long)t->tv_expires.tv_usec,
 743                       t->delay_us,
 744                       t->data
 745                       );
 746     }
 747     used += sprintf(bigbuf + used, "\n");
 748 #endif
 749
 750     used += sprintf(bigbuf + used, "Active timers:\n");
 751     save_flags(flags);
 752     cli();
 753     t = fast_timer_list;
 754     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 755     {
 756       nextt = t->next;
 757       restore_flags(flags);
 758       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 759                       "d: %6li us data: 0x%08lX"
 760 /*                      " func: 0x%08lX" */
 761                       "\n",
 762                       t->name,
 763                       (unsigned long)t->tv_set.tv_sec,
 764                       (unsigned long)t->tv_set.tv_usec,
 765                       (unsigned long)t->tv_expires.tv_sec,
 766                       (unsigned long)t->tv_expires.tv_usec,
 767                       t->delay_us,
 768                       t->data
 769 /*                      , t->function */
 770                       );
 771       cli();
 772       if (t->next != nextt)
 773       {
 774         printk(KERN_WARNING "timer removed!\n");
 775       }
 776       t = nextt;
 777     }
 778     restore_flags(flags);
 779   }
 780
 781   if (used - offset < len)
 782   {
 783     len = used - offset;
 784   }
 785
 786   memcpy(buf, bigbuf + offset, len);
 787   *start = buf;
 788   *eof = 1;
 789
 790   return len;
 791 }
 792 #endif /* PROC_FS */
 793
 794 #ifdef FAST_TIMER_TEST
 795 static volatile unsigned long i = 0;
 796 static volatile int num_test_timeout = 0;
 797 static struct fast_timer tr[10];
 798 static int exp_num[10];
 799
 800 static struct timeval tv_exp[100];
 801
 802 static void test_timeout(unsigned long data)
 803 {
 804   do_gettimeofday_fast(&tv_exp[data]);
 805   exp_num[data] = num_test_timeout;
 806
 807   num_test_timeout++;
 808 }
 809
 810 static void test_timeout1(unsigned long data)
 811 {
 812   do_gettimeofday_fast(&tv_exp[data]);
 813   exp_num[data] = num_test_timeout;
 814   if (data < 7)
 815   {
 816     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 817     i++;
 818   }
 819   num_test_timeout++;
 820 }
 821
 822 DP(
 823 static char buf0[2000];
 824 static char buf1[2000];
 825 static char buf2[2000];
 826 static char buf3[2000];
 827 static char buf4[2000];
 828 );
 829
 830 static char buf5[6000];
 831 static int j_u[1000];
 832
 833 static void fast_timer_test(void)
 834 {
 835   int prev_num;
 836   int j;
 837
 838   struct timeval tv, tv0, tv1, tv2;
 839
 840   printk("fast_timer_test() start\n");
 841   do_gettimeofday_fast(&tv);
 842
 843   for (j = 0; j < 1000; j++)
 844   {
 845     j_u[j] = GET_JIFFIES_USEC();
 846   }
 847   for (j = 0; j < 100; j++)
 848   {
 849     do_gettimeofday_fast(&tv_exp[j]);
 850   }
 851   printk("fast_timer_test() %is %06i\n", tv.tv_sec, tv.tv_usec);
 852
 853   for (j = 0; j < 1000; j++)
 854   {
 855     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]);
 856     j += 4;
 857   }
 858   for (j = 0; j < 100; j++)
 859   {
 860     printk("%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 861            tv_exp[j].tv_sec,tv_exp[j].tv_usec,
 862            tv_exp[j+1].tv_sec,tv_exp[j+1].tv_usec,
 863            tv_exp[j+2].tv_sec,tv_exp[j+2].tv_usec,
 864            tv_exp[j+3].tv_sec,tv_exp[j+3].tv_usec,
 865            tv_exp[j+4].tv_sec,tv_exp[j+4].tv_usec);
 866     j += 4;
 867   }
 868   do_gettimeofday_fast(&tv0);
 869   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 870   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 871   i++;
 872   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 873   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 874   i++;
 875   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 876   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 877   i++;
 878   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 879   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 880   i++;
 881   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 882   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 883   i++;
 884   do_gettimeofday_fast(&tv1);
 885
 886   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 887
 888   prev_num = num_test_timeout;
 889   while (num_test_timeout < i)
 890   {
 891     if (num_test_timeout != prev_num)
 892     {
 893       prev_num = num_test_timeout;
 894     }
 895   }
 896   do_gettimeofday_fast(&tv2);
 897   printk("Timers started    %is %06i\n", tv0.tv_sec, tv0.tv_usec);
 898   printk("Timers started at %is %06i\n", tv1.tv_sec, tv1.tv_usec);
 899   printk("Timers done       %is %06i\n", tv2.tv_sec, tv2.tv_usec);
 900   DP(printk("buf0:\n");
 901      printk(buf0);
 902      printk("buf1:\n");
 903      printk(buf1);
 904      printk("buf2:\n");
 905      printk(buf2);
 906      printk("buf3:\n");
 907      printk(buf3);
 908      printk("buf4:\n");
 909      printk(buf4);
 910   );
 911   printk("buf5:\n");
 912   printk(buf5);
 913
 914   printk("timers set:\n");
 915   for(j = 0; j<i; j++)
 916   {
 917     struct fast_timer *t = &tr[j];
 918     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 919            "data: 0x%08X func: 0x%08X\n",
 920            t->name,
 921            t->tv_set.tv_sec,
 922            t->tv_set.tv_usec,
 923            t->tv_expires.tv_sec,
 924            t->tv_expires.tv_usec,
 925            t->data,
 926            t->function
 927            );
 928
 929     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 930            t->delay_us,
 931            tv_exp[j].tv_sec,
 932            tv_exp[j].tv_usec,
 933            exp_num[j],
 934            (tv_exp[j].tv_sec - t->tv_expires.tv_sec)*1000000 + tv_exp[j].tv_usec - t->tv_expires.tv_usec);
 935   }
 936   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 937   printk("buf5 after all done:\n");
 938   printk(buf5);
 939   printk("fast_timer_test() done\n");
 940 }
 941 #endif
 942
 943
 944 void fast_timer_init(void)
 945 {
 946   /* For some reason, request_irq() hangs when called froom time_init() */
 947   if (!fast_timer_is_init)
 948   {
 949 #if 0 && defined(FAST_TIMER_TEST)
 950     int i;
 951 #endif
 952
 953     printk(KERN_INFO "fast_timer_init()\n");
 954
 955 #if 0 && defined(FAST_TIMER_TEST)
 956     for (i = 0; i <= TIMER0_DIV; i++)
 957     {
 958       /* We must be careful not to get overflow... */
 959       printk("%3i %6u\n", i, timer0_value_us[i]);
 960     }
 961 #endif
 962 #ifdef CONFIG_PROC_FS
 963    if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 )))
 964      fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 965 #endif /* PROC_FS */
 966     if(request_irq(TIMER1_IRQ_NBR, timer1_handler, SA_SHIRQ,
 967                    "fast timer int", NULL))
 968     {
 969       printk("err: timer1 irq\n");
 970     }
 971     fast_timer_is_init = 1;
 972 #ifdef FAST_TIMER_TEST
 973     printk("do test\n");
 974     fast_timer_test();
 975 #endif
 976   }
 977 }