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