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

   1 /* $Id: fasttimer.c,v 1.9 2005/03/04 08:16:16 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 1.9  2005/03/04 08:16:16  starvik
   9  * Merge of Linux 2.6.11.
  10  *
  11  * Revision 1.8  2005/01/05 06:09:29  starvik
  12  * cli()/sti() will be obsolete in 2.6.11.
  13  *
  14  * Revision 1.7  2005/01/03 13:35:46  starvik
  15  * Removed obsolete stuff.
  16  * Mark fast timer IRQ as not shared.
  17  *
  18  * Revision 1.6  2004/05/14 10:18:39  starvik
  19  * Export fast_timer_list
  20  *
  21  * Revision 1.5  2004/05/14 07:58:01  starvik
  22  * Merge of changes from 2.4
  23  *
  24  * Revision 1.4  2003/07/04 08:27:41  starvik
  25  * Merge of Linux 2.5.74
  26  *
  27  * Revision 1.3  2002/12/12 08:26:32  starvik
  28  * Don't use C-comments inside CVS comments
  29  *
  30  * Revision 1.2  2002/12/11 15:42:02  starvik
  31  * Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/
  32  *
  33  * Revision 1.1  2002/11/18 07:58:06  starvik
  34  * Fast timers (from Linux 2.4)
  35  *
  36  * Revision 1.5  2002/10/15 06:21:39  starvik
  37  * Added call to init_waitqueue_head
  38  *
  39  * Revision 1.4  2002/05/28 17:47:59  johana
  40  * Added del_fast_timer()
  41  *
  42  * Revision 1.3  2002/05/28 16:16:07  johana
  43  * Handle empty fast_timer_list
  44  *
  45  * Revision 1.2  2002/05/27 15:38:42  johana
  46  * Made it compile without warnings on Linux 2.4.
  47  * (includes, wait_queue, PROC_FS and snprintf)
  48  *
  49  * Revision 1.1  2002/05/27 15:32:25  johana
  50  * arch/etrax100/kernel/fasttimer.c v1.8 from the elinux tree.
  51  *
  52  * Revision 1.8  2001/11/27 13:50:40  pkj
  53  * Disable interrupts while stopping the timer and while modifying the
  54  * list of active timers in timer1_handler() as it may be interrupted
  55  * by other interrupts (e.g., the serial interrupt) which may add fast
  56  * timers.
  57  *
  58  * Revision 1.7  2001/11/22 11:50:32  pkj
  59  * * Only store information about the last 16 timers.
  60  * * proc_fasttimer_read() now uses an allocated buffer, since it
  61  *   requires more space than just a page even for only writing the
  62  *   last 16 timers. The buffer is only allocated on request, so
  63  *   unless /proc/fasttimer is read, it is never allocated.
  64  * * Renamed fast_timer_started to fast_timers_started to match
  65  *   fast_timers_added and fast_timers_expired.
  66  * * Some clean-up.
  67  *
  68  * Revision 1.6  2000/12/13 14:02:08  johana
  69  * Removed volatile for fast_timer_list
  70  *
  71  * Revision 1.5  2000/12/13 13:55:35  johana
  72  * Added DEBUG_LOG, added som cli() and cleanup
  73  *
  74  * Revision 1.4  2000/12/05 13:48:50  johana
  75  * Added range check when writing proc file, modified timer int handling
  76  *
  77  * Revision 1.3  2000/11/23 10:10:20  johana
  78  * More debug/logging possibilities.
  79  * Moved GET_JIFFIES_USEC() to timex.h and time.c
  80  *
  81  * Revision 1.2  2000/11/01 13:41:04  johana
  82  * Clean up and bugfixes.
  83  * Created new do_gettimeofday_fast() that gets a timeval struct
  84  * with time based on jiffies and *R_TIMER0_DATA, uses a table
  85  * for fast conversion of timer value to microseconds.
  86  * (Much faster the standard do_gettimeofday() and we don't really
  87  * wan't to use the true time - we wan't the "uptime" so timers don't screw up
  88  * when we change the time.
  89  * TODO: Add efficient support for continuous timers as well.
  90  *
  91  * Revision 1.1  2000/10/26 15:49:16  johana
  92  * Added fasttimer, highresolution timers.
  93  *
  94  * Copyright (C) 2000,2001 2002 Axis Communications AB, Lund, Sweden
  95  */
  96
  97 #include <linux/errno.h>
  98 #include <linux/sched.h>
  99 #include <linux/kernel.h>
 100 #include <linux/param.h>
 101 #include <linux/string.h>
 102 #include <linux/mm.h>
 103 #include <linux/vmalloc.h>
 104 #include <linux/interrupt.h>
 105 #include <linux/time.h>
 106 #include <linux/delay.h>
 107
 108 #include <asm/segment.h>
 109 #include <asm/io.h>
 110 #include <asm/irq.h>
 111 #include <asm/delay.h>
 112 #include <asm/rtc.h>
 113
 114 #include <linux/config.h>
 115 #include <linux/version.h>
 116
 117 #include <asm/arch/svinto.h>
 118 #include <asm/fasttimer.h>
 119 #include <linux/proc_fs.h>
 120
 121
 122 #define DEBUG_LOG_INCLUDED
 123 #define FAST_TIMER_LOG
 124 //#define FAST_TIMER_TEST
 125
 126 #define FAST_TIMER_SANITY_CHECKS
 127
 128 #ifdef FAST_TIMER_SANITY_CHECKS
 129 #define SANITYCHECK(x) x
 130 static int sanity_failed = 0;
 131 #else
 132 #define SANITYCHECK(x)
 133 #endif
 134
 135 #define D1(x)
 136 #define D2(x)
 137 #define DP(x)
 138
 139 #define __INLINE__ inline
 140
 141 static int fast_timer_running = 0;
 142 static int fast_timers_added = 0;
 143 static int fast_timers_started = 0;
 144 static int fast_timers_expired = 0;
 145 static int fast_timers_deleted = 0;
 146 static int fast_timer_is_init = 0;
 147 static int fast_timer_ints = 0;
 148
 149 struct fast_timer *fast_timer_list = NULL;
 150
 151 #ifdef DEBUG_LOG_INCLUDED
 152 #define DEBUG_LOG_MAX 128
 153 static const char * debug_log_string[DEBUG_LOG_MAX];
 154 static unsigned long debug_log_value[DEBUG_LOG_MAX];
 155 static int debug_log_cnt = 0;
 156 static int debug_log_cnt_wrapped = 0;
 157
 158 #define DEBUG_LOG(string, value) \
 159 { \
 160   unsigned long log_flags; \
 161   local_irq_save(log_flags); \
 162   debug_log_string[debug_log_cnt] = (string); \
 163   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
 164   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
 165   { \
 166     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
 167     debug_log_cnt_wrapped = 1; \
 168   } \
 169   local_irq_restore(log_flags); \
 170 }
 171 #else
 172 #define DEBUG_LOG(string, value)
 173 #endif
 174
 175
 176 /* The frequencies for index = clkselx number in R_TIMER_CTRL */
 177 #define NUM_TIMER_FREQ 15
 178 #define MAX_USABLE_TIMER_FREQ 7
 179 #define MAX_DELAY_US  853333L
 180 const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
 181 {
 182   3,   /* 0 3333 - 853333 us */
 183   6,   /* 1 1666 - 426666 us */
 184   12,  /* 2  833 - 213333 us */
 185   24,  /* 3  416 - 106666 us */
 186   48,  /* 4  208 -  53333 us */
 187   96,  /* 5  104 -  26666 us */
 188   192, /* 6   52 -  13333 us */
 189   384, /* 7   26 -   6666 us */
 190   576,
 191   1152,
 192   2304,
 193   4608,
 194   9216,
 195   18432,
 196   62500,
 197   /* 15 = cascade */
 198 };
 199 #define NUM_TIMER_STATS 16
 200 #ifdef FAST_TIMER_LOG
 201 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 202 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 203 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 204 #endif
 205
 206 int timer_div_settings[NUM_TIMER_STATS];
 207 int timer_freq_settings[NUM_TIMER_STATS];
 208 int timer_delay_settings[NUM_TIMER_STATS];
 209
 210 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 211 void __INLINE__ do_gettimeofday_fast(struct timeval *tv)
 212 {
 213   unsigned long sec = jiffies;
 214   unsigned long usec = GET_JIFFIES_USEC();
 215
 216   usec += (sec % HZ) * (1000000 / HZ);
 217   sec = sec / HZ;
 218
 219   if (usec > 1000000)
 220   {
 221     usec -= 1000000;
 222     sec++;
 223   }
 224   tv->tv_sec = sec;
 225   tv->tv_usec = usec;
 226 }
 227
 228 int __INLINE__ timeval_cmp(struct timeval *t0, struct timeval *t1)
 229 {
 230   if (t0->tv_sec < t1->tv_sec)
 231   {
 232     return -1;
 233   }
 234   else if (t0->tv_sec > t1->tv_sec)
 235   {
 236     return 1;
 237   }
 238   if (t0->tv_usec < t1->tv_usec)
 239   {
 240     return -1;
 241   }
 242   else if (t0->tv_usec > t1->tv_usec)
 243   {
 244     return 1;
 245   }
 246   return 0;
 247 }
 248
 249 void __INLINE__ start_timer1(unsigned long delay_us)
 250 {
 251   int freq_index = 0; /* This is the lowest resolution */
 252   unsigned long upper_limit = MAX_DELAY_US;
 253
 254   unsigned long div;
 255   /* Start/Restart the timer to the new shorter value */
 256   /* t = 1/freq = 1/19200 = 53us
 257    * T=div*t,  div = T/t = delay_us*freq/1000000
 258    */
 259 #if 1 /* Adaptive timer settings */
 260   while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
 261   {
 262     freq_index++;
 263     upper_limit >>= 1; /* Divide by 2 using shift */
 264   }
 265   if (freq_index > 0)
 266   {
 267     freq_index--;
 268   }
 269 #else
 270   freq_index = 6;
 271 #endif
 272   div = delay_us * timer_freq_100[freq_index]/10000;
 273   if (div < 2)
 274   {
 275     /* Maybe increase timer freq? */
 276     div = 2;
 277   }
 278   if (div > 255)
 279   {
 280     div = 0; /* This means 256, the max the timer takes */
 281     /* If a longer timeout than the timer can handle is used,
 282      * then we must restart it when it goes off.
 283      */
 284   }
 285
 286   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
 287   timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
 288   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 289
 290   D1(printk("start_timer1 : %d us freq: %i div: %i\n",
 291             delay_us, freq_index, div));
 292   /* Clear timer1 irq */
 293   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 294
 295   /* Set timer values */
 296   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 297     (r_timer_ctrl_shadow &
 298      ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
 299      ~IO_MASK(R_TIMER_CTRL, tm1) &
 300      ~IO_MASK(R_TIMER_CTRL, clksel1)) |
 301     IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
 302     IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
 303     IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
 304
 305   /* Ack interrupt */
 306   *R_TIMER_CTRL =  r_timer_ctrl_shadow |
 307     IO_STATE(R_TIMER_CTRL, i1, clr);
 308
 309   /* Start timer */
 310   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 311     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 312     IO_STATE(R_TIMER_CTRL, tm1, run);
 313
 314   /* Enable timer1 irq */
 315   *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
 316   fast_timers_started++;
 317   fast_timer_running = 1;
 318 }
 319
 320 /* In version 1.4 this function takes 27 - 50 us */
 321 void start_one_shot_timer(struct fast_timer *t,
 322                           fast_timer_function_type *function,
 323                           unsigned long data,
 324                           unsigned long delay_us,
 325                           const char *name)
 326 {
 327   unsigned long flags;
 328   struct fast_timer *tmp;
 329
 330   D1(printk("sft %s %d us\n", name, delay_us));
 331
 332   local_irq_save(flags);
 333
 334   do_gettimeofday_fast(&t->tv_set);
 335   tmp = fast_timer_list;
 336
 337   SANITYCHECK({ /* Check so this is not in the list already... */
 338     while (tmp != NULL)
 339     {
 340       if (tmp == t)
 341       {
 342         printk(KERN_WARNING
 343                "timer name: %s data: 0x%08lX already in list!\n", name, data);
 344         sanity_failed++;
 345         return;
 346       }
 347       else
 348       {
 349         tmp = tmp->next;
 350       }
 351     }
 352     tmp = fast_timer_list;
 353   });
 354
 355   t->delay_us = delay_us;
 356   t->function = function;
 357   t->data = data;
 358   t->name = name;
 359
 360   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 361   t->tv_expires.tv_sec  = t->tv_set.tv_sec  + delay_us / 1000000;
 362   if (t->tv_expires.tv_usec > 1000000)
 363   {
 364     t->tv_expires.tv_usec -= 1000000;
 365     t->tv_expires.tv_sec++;
 366   }
 367 #ifdef FAST_TIMER_LOG
 368   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 369 #endif
 370   fast_timers_added++;
 371
 372   /* Check if this should timeout before anything else */
 373   if (tmp == NULL || timeval_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 374   {
 375     /* Put first in list and modify the timer value */
 376     t->prev = NULL;
 377     t->next = fast_timer_list;
 378     if (fast_timer_list)
 379     {
 380       fast_timer_list->prev = t;
 381     }
 382     fast_timer_list = t;
 383 #ifdef FAST_TIMER_LOG
 384     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 385 #endif
 386     start_timer1(delay_us);
 387   } else {
 388     /* Put in correct place in list */
 389     while (tmp->next &&
 390            timeval_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 391     {
 392       tmp = tmp->next;
 393     }
 394     /* Insert t after tmp */
 395     t->prev = tmp;
 396     t->next = tmp->next;
 397     if (tmp->next)
 398     {
 399       tmp->next->prev = t;
 400     }
 401     tmp->next = t;
 402   }
 403
 404   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 405
 406   local_irq_restore(flags);
 407 } /* start_one_shot_timer */
 408
 409 static inline int fast_timer_pending (const struct fast_timer * t)
 410 {
 411   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 412 }
 413
 414 static inline int detach_fast_timer (struct fast_timer *t)
 415 {
 416   struct fast_timer *next, *prev;
 417   if (!fast_timer_pending(t))
 418     return 0;
 419   next = t->next;
 420   prev = t->prev;
 421   if (next)
 422     next->prev = prev;
 423   if (prev)
 424     prev->next = next;
 425   else
 426     fast_timer_list = next;
 427   fast_timers_deleted++;
 428   return 1;
 429 }
 430
 431 int del_fast_timer(struct fast_timer * t)
 432 {
 433   unsigned long flags;
 434   int ret;
 435
 436   local_irq_save(flags);
 437   ret = detach_fast_timer(t);
 438   t->next = t->prev = NULL;
 439   local_irq_restore(flags);
 440   return ret;
 441 } /* del_fast_timer */
 442
 443
 444 /* Interrupt routines or functions called in interrupt context */
 445
 446 /* Timer 1 interrupt handler */
 447
 448 static irqreturn_t
 449 timer1_handler(int irq, void *dev_id, struct pt_regs *regs)
 450 {
 451   struct fast_timer *t;
 452   unsigned long flags;
 453
 454   local_irq_save(flags);
 455
 456   /* Clear timer1 irq */
 457   *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
 458
 459   /* First stop timer, then ack interrupt */
 460   /* Stop timer */
 461   *R_TIMER_CTRL = r_timer_ctrl_shadow =
 462     (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
 463     IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
 464
 465   /* Ack interrupt */
 466   *R_TIMER_CTRL =  r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
 467
 468   fast_timer_running = 0;
 469   fast_timer_ints++;
 470
 471   local_irq_restore(flags);
 472
 473   t = fast_timer_list;
 474   while (t)
 475   {
 476     struct timeval tv;
 477
 478     /* Has it really expired? */
 479     do_gettimeofday_fast(&tv);
 480     D1(printk("t: %is %06ius\n", tv.tv_sec, tv.tv_usec));
 481
 482     if (timeval_cmp(&t->tv_expires, &tv) <= 0)
 483     {
 484       /* Yes it has expired */
 485 #ifdef FAST_TIMER_LOG
 486       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 487 #endif
 488       fast_timers_expired++;
 489
 490       /* Remove this timer before call, since it may reuse the timer */
 491       local_irq_save(flags);
 492       if (t->prev)
 493       {
 494         t->prev->next = t->next;
 495       }
 496       else
 497       {
 498         fast_timer_list = t->next;
 499       }
 500       if (t->next)
 501       {
 502         t->next->prev = t->prev;
 503       }
 504       t->prev = NULL;
 505       t->next = NULL;
 506       local_irq_restore(flags);
 507
 508       if (t->function != NULL)
 509       {
 510         t->function(t->data);
 511       }
 512       else
 513       {
 514         DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
 515       }
 516     }
 517     else
 518     {
 519       /* Timer is to early, let's set it again using the normal routines */
 520       D1(printk(".\n"));
 521     }
 522
 523     local_irq_save(flags);
 524     if ((t = fast_timer_list) != NULL)
 525     {
 526       /* Start next timer.. */
 527       long us;
 528       struct timeval tv;
 529
 530       do_gettimeofday_fast(&tv);
 531       us = ((t->tv_expires.tv_sec - tv.tv_sec) * 1000000 +
 532             t->tv_expires.tv_usec - tv.tv_usec);
 533       if (us > 0)
 534       {
 535         if (!fast_timer_running)
 536         {
 537 #ifdef FAST_TIMER_LOG
 538           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 539 #endif
 540           start_timer1(us);
 541         }
 542         local_irq_restore(flags);
 543         break;
 544       }
 545       else
 546       {
 547         /* Timer already expired, let's handle it better late than never.
 548          * The normal loop handles it
 549          */
 550         D1(printk("e! %d\n", us));
 551       }
 552     }
 553     local_irq_restore(flags);
 554   }
 555
 556   if (!t)
 557   {
 558     D1(printk("t1 stop!\n"));
 559   }
 560
 561   return IRQ_HANDLED;
 562 }
 563
 564 static void wake_up_func(unsigned long data)
 565 {
 566 #ifdef DECLARE_WAITQUEUE
 567   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 568 #else
 569   struct wait_queue **sleep_wait_p = (struct wait_queue **)data;
 570 #endif
 571   wake_up(sleep_wait_p);
 572 }
 573
 574
 575 /* Useful API */
 576
 577 void schedule_usleep(unsigned long us)
 578 {
 579   struct fast_timer t;
 580 #ifdef DECLARE_WAITQUEUE
 581   wait_queue_head_t sleep_wait;
 582   init_waitqueue_head(&sleep_wait);
 583   {
 584   DECLARE_WAITQUEUE(wait, current);
 585 #else
 586   struct wait_queue *sleep_wait = NULL;
 587   struct wait_queue wait = { current, NULL };
 588 #endif
 589
 590   D1(printk("schedule_usleep(%d)\n", us));
 591   add_wait_queue(&sleep_wait, &wait);
 592   set_current_state(TASK_INTERRUPTIBLE);
 593   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 594                        "usleep");
 595   schedule();
 596   set_current_state(TASK_RUNNING);
 597   remove_wait_queue(&sleep_wait, &wait);
 598   D1(printk("done schedule_usleep(%d)\n", us));
 599 #ifdef DECLARE_WAITQUEUE
 600   }
 601 #endif
 602 }
 603
 604 #ifdef CONFIG_PROC_FS
 605 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 606                        ,int *eof, void *data_unused);
 607 static struct proc_dir_entry *fasttimer_proc_entry;
 608 #endif /* CONFIG_PROC_FS */
 609
 610 #ifdef CONFIG_PROC_FS
 611
 612 /* This value is very much based on testing */
 613 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 614
 615 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 616                        ,int *eof, void *data_unused)
 617 {
 618   unsigned long flags;
 619   int i = 0;
 620   int num_to_show;
 621   struct timeval tv;
 622   struct fast_timer *t, *nextt;
 623   static char *bigbuf = NULL;
 624   static unsigned long used;
 625
 626   if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE)))
 627   {
 628     used = 0;
 629     bigbuf[0] = '\0';
 630     return 0;
 631   }
 632
 633   if (!offset || !used)
 634   {
 635     do_gettimeofday_fast(&tv);
 636
 637     used = 0;
 638     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 639                     fast_timers_added);
 640     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 641                     fast_timers_started);
 642     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 643                     fast_timer_ints);
 644     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 645                     fast_timers_expired);
 646     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 647                     fast_timers_deleted);
 648     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 649                     fast_timer_running ? "yes" : "no");
 650     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 651                     (unsigned long)tv.tv_sec,
 652                     (unsigned long)tv.tv_usec);
 653 #ifdef FAST_TIMER_SANITY_CHECKS
 654     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 655                     sanity_failed);
 656 #endif
 657     used += sprintf(bigbuf + used, "\n");
 658
 659 #ifdef DEBUG_LOG_INCLUDED
 660     {
 661       int end_i = debug_log_cnt;
 662       i = 0;
 663
 664       if (debug_log_cnt_wrapped)
 665       {
 666         i = debug_log_cnt;
 667       }
 668
 669       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 670              used+100 < BIG_BUF_SIZE)
 671       {
 672         used += sprintf(bigbuf + used, debug_log_string[i],
 673                         debug_log_value[i]);
 674         i = (i+1) % DEBUG_LOG_MAX;
 675       }
 676     }
 677     used += sprintf(bigbuf + used, "\n");
 678 #endif
 679
 680     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 681                    NUM_TIMER_STATS);
 682     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 683     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 684     {
 685       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 686
 687 #if 1 //ndef FAST_TIMER_LOG
 688       used += sprintf(bigbuf + used, "div: %i freq: %i delay: %i"
 689                       "\n",
 690                       timer_div_settings[cur],
 691                       timer_freq_settings[cur],
 692                       timer_delay_settings[cur]
 693                       );
 694 #endif
 695 #ifdef FAST_TIMER_LOG
 696       t = &timer_started_log[cur];
 697       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 698                       "d: %6li us data: 0x%08lX"
 699                       "\n",
 700                       t->name,
 701                       (unsigned long)t->tv_set.tv_sec,
 702                       (unsigned long)t->tv_set.tv_usec,
 703                       (unsigned long)t->tv_expires.tv_sec,
 704                       (unsigned long)t->tv_expires.tv_usec,
 705                       t->delay_us,
 706                       t->data
 707                       );
 708 #endif
 709     }
 710     used += sprintf(bigbuf + used, "\n");
 711
 712 #ifdef FAST_TIMER_LOG
 713     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 714                    NUM_TIMER_STATS);
 715     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 716     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 717     {
 718       t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
 719       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 720                       "d: %6li us data: 0x%08lX"
 721                       "\n",
 722                       t->name,
 723                       (unsigned long)t->tv_set.tv_sec,
 724                       (unsigned long)t->tv_set.tv_usec,
 725                       (unsigned long)t->tv_expires.tv_sec,
 726                       (unsigned long)t->tv_expires.tv_usec,
 727                       t->delay_us,
 728                       t->data
 729                       );
 730     }
 731     used += sprintf(bigbuf + used, "\n");
 732
 733     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 734                    NUM_TIMER_STATS);
 735     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 736     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 737     {
 738       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 739       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 740                       "d: %6li us data: 0x%08lX"
 741                       "\n",
 742                       t->name,
 743                       (unsigned long)t->tv_set.tv_sec,
 744                       (unsigned long)t->tv_set.tv_usec,
 745                       (unsigned long)t->tv_expires.tv_sec,
 746                       (unsigned long)t->tv_expires.tv_usec,
 747                       t->delay_us,
 748                       t->data
 749                       );
 750     }
 751     used += sprintf(bigbuf + used, "\n");
 752 #endif
 753
 754     used += sprintf(bigbuf + used, "Active timers:\n");
 755     local_irq_save(flags);
 756     t = fast_timer_list;
 757     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 758     {
 759       nextt = t->next;
 760       local_irq_restore(flags);
 761       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 762                       "d: %6li us data: 0x%08lX"
 763 /*                      " func: 0x%08lX" */
 764                       "\n",
 765                       t->name,
 766                       (unsigned long)t->tv_set.tv_sec,
 767                       (unsigned long)t->tv_set.tv_usec,
 768                       (unsigned long)t->tv_expires.tv_sec,
 769                       (unsigned long)t->tv_expires.tv_usec,
 770                       t->delay_us,
 771                       t->data
 772 /*                      , t->function */
 773                       );
 774       local_irq_disable();
 775       if (t->next != nextt)
 776       {
 777         printk(KERN_WARNING "timer removed!\n");
 778       }
 779       t = nextt;
 780     }
 781     local_irq_restore(flags);
 782   }
 783
 784   if (used - offset < len)
 785   {
 786     len = used - offset;
 787   }
 788
 789   memcpy(buf, bigbuf + offset, len);
 790   *start = buf;
 791   *eof = 1;
 792
 793   return len;
 794 }
 795 #endif /* PROC_FS */
 796
 797 #ifdef FAST_TIMER_TEST
 798 static volatile unsigned long i = 0;
 799 static volatile int num_test_timeout = 0;
 800 static struct fast_timer tr[10];
 801 static int exp_num[10];
 802
 803 static struct timeval tv_exp[100];
 804
 805 static void test_timeout(unsigned long data)
 806 {
 807   do_gettimeofday_fast(&tv_exp[data]);
 808   exp_num[data] = num_test_timeout;
 809
 810   num_test_timeout++;
 811 }
 812
 813 static void test_timeout1(unsigned long data)
 814 {
 815   do_gettimeofday_fast(&tv_exp[data]);
 816   exp_num[data] = num_test_timeout;
 817   if (data < 7)
 818   {
 819     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 820     i++;
 821   }
 822   num_test_timeout++;
 823 }
 824
 825 DP(
 826 static char buf0[2000];
 827 static char buf1[2000];
 828 static char buf2[2000];
 829 static char buf3[2000];
 830 static char buf4[2000];
 831 );
 832
 833 static char buf5[6000];
 834 static int j_u[1000];
 835
 836 static void fast_timer_test(void)
 837 {
 838   int prev_num;
 839   int j;
 840
 841   struct timeval tv, tv0, tv1, tv2;
 842
 843   printk("fast_timer_test() start\n");
 844   do_gettimeofday_fast(&tv);
 845
 846   for (j = 0; j < 1000; j++)
 847   {
 848     j_u[j] = GET_JIFFIES_USEC();
 849   }
 850   for (j = 0; j < 100; j++)
 851   {
 852     do_gettimeofday_fast(&tv_exp[j]);
 853   }
 854   printk("fast_timer_test() %is %06i\n", tv.tv_sec, tv.tv_usec);
 855
 856   for (j = 0; j < 1000; j++)
 857   {
 858     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]);
 859     j += 4;
 860   }
 861   for (j = 0; j < 100; j++)
 862   {
 863     printk("%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 864            tv_exp[j].tv_sec,tv_exp[j].tv_usec,
 865            tv_exp[j+1].tv_sec,tv_exp[j+1].tv_usec,
 866            tv_exp[j+2].tv_sec,tv_exp[j+2].tv_usec,
 867            tv_exp[j+3].tv_sec,tv_exp[j+3].tv_usec,
 868            tv_exp[j+4].tv_sec,tv_exp[j+4].tv_usec);
 869     j += 4;
 870   }
 871   do_gettimeofday_fast(&tv0);
 872   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 873   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 874   i++;
 875   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 876   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 877   i++;
 878   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 879   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 880   i++;
 881   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 882   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 883   i++;
 884   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 885   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 886   i++;
 887   do_gettimeofday_fast(&tv1);
 888
 889   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 890
 891   prev_num = num_test_timeout;
 892   while (num_test_timeout < i)
 893   {
 894     if (num_test_timeout != prev_num)
 895     {
 896       prev_num = num_test_timeout;
 897     }
 898   }
 899   do_gettimeofday_fast(&tv2);
 900   printk("Timers started    %is %06i\n", tv0.tv_sec, tv0.tv_usec);
 901   printk("Timers started at %is %06i\n", tv1.tv_sec, tv1.tv_usec);
 902   printk("Timers done       %is %06i\n", tv2.tv_sec, tv2.tv_usec);
 903   DP(printk("buf0:\n");
 904      printk(buf0);
 905      printk("buf1:\n");
 906      printk(buf1);
 907      printk("buf2:\n");
 908      printk(buf2);
 909      printk("buf3:\n");
 910      printk(buf3);
 911      printk("buf4:\n");
 912      printk(buf4);
 913   );
 914   printk("buf5:\n");
 915   printk(buf5);
 916
 917   printk("timers set:\n");
 918   for(j = 0; j<i; j++)
 919   {
 920     struct fast_timer *t = &tr[j];
 921     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 922            "data: 0x%08X func: 0x%08X\n",
 923            t->name,
 924            t->tv_set.tv_sec,
 925            t->tv_set.tv_usec,
 926            t->tv_expires.tv_sec,
 927            t->tv_expires.tv_usec,
 928            t->data,
 929            t->function
 930            );
 931
 932     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 933            t->delay_us,
 934            tv_exp[j].tv_sec,
 935            tv_exp[j].tv_usec,
 936            exp_num[j],
 937            (tv_exp[j].tv_sec - t->tv_expires.tv_sec)*1000000 + tv_exp[j].tv_usec - t->tv_expires.tv_usec);
 938   }
 939   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 940   printk("buf5 after all done:\n");
 941   printk(buf5);
 942   printk("fast_timer_test() done\n");
 943 }
 944 #endif
 945
 946
 947 void fast_timer_init(void)
 948 {
 949   /* For some reason, request_irq() hangs when called froom time_init() */
 950   if (!fast_timer_is_init)
 951   {
 952 #if 0 && defined(FAST_TIMER_TEST)
 953     int i;
 954 #endif
 955
 956     printk(KERN_INFO "fast_timer_init()\n");
 957
 958 #if 0 && defined(FAST_TIMER_TEST)
 959     for (i = 0; i <= TIMER0_DIV; i++)
 960     {
 961       /* We must be careful not to get overflow... */
 962       printk("%3i %6u\n", i, timer0_value_us[i]);
 963     }
 964 #endif
 965 #ifdef CONFIG_PROC_FS
 966    if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 )))
 967      fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 968 #endif /* PROC_FS */
 969     if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
 970                    "fast timer int", NULL))
 971     {
 972       printk("err: timer1 irq\n");
 973     }
 974     fast_timer_is_init = 1;
 975 #ifdef FAST_TIMER_TEST
 976     printk("do test\n");
 977     fast_timer_test();
 978 #endif
 979   }
 980 }