release/src-rt-6.x/linux/linux-2.6/arch/cris/arch-v32/kernel/fasttimer.c

   1 /* $Id: fasttimer.c,v 1.11 2005/01/04 11:15:46 starvik Exp $
   2  * linux/arch/cris/kernel/fasttimer.c
   3  *
   4  * Fast timers for ETRAX FS
   5  * This may be useful in other OS than Linux so use 2 space indentation...
   6  *
   7  * $Log: fasttimer.c,v $
   8  * Revision 1.11  2005/01/04 11:15:46  starvik
   9  * Don't share timer IRQ.
  10  *
  11  * Revision 1.10  2004/12/07 09:19:38  starvik
  12  * Corrected includes.
  13  * Use correct interrupt macros.
  14  *
  15  * Revision 1.9  2004/05/14 10:18:58  starvik
  16  * Export fast_timer_list
  17  *
  18  * Revision 1.8  2004/05/14 07:58:03  starvik
  19  * Merge of changes from 2.4
  20  *
  21  * Revision 1.7  2003/07/10 12:06:14  starvik
  22  * Return IRQ_NONE if irq wasn't handled
  23  *
  24  * Revision 1.6  2003/07/04 08:27:49  starvik
  25  * Merge of Linux 2.5.74
  26  *
  27  * Revision 1.5  2003/06/05 10:16:22  johana
  28  * New INTR_VECT macros.
  29  *
  30  * Revision 1.4  2003/06/03 08:49:45  johana
  31  * Fixed typo.
  32  *
  33  * Revision 1.3  2003/06/02 12:51:27  johana
  34  * Now compiles.
  35  * Commented some include files that probably can be removed.
  36  *
  37  * Revision 1.2  2003/06/02 12:09:41  johana
  38  * Ported to ETRAX FS using the trig interrupt instead of timer1.
  39  *
  40  * Revision 1.3  2002/12/12 08:26:32  starvik
  41  * Don't use C-comments inside CVS comments
  42  *
  43  * Revision 1.2  2002/12/11 15:42:02  starvik
  44  * Extracted v10 (ETRAX 100LX) specific stuff from arch/cris/kernel/
  45  *
  46  * Revision 1.1  2002/11/18 07:58:06  starvik
  47  * Fast timers (from Linux 2.4)
  48  *
  49  * Revision 1.5  2002/10/15 06:21:39  starvik
  50  * Added call to init_waitqueue_head
  51  *
  52  * Revision 1.4  2002/05/28 17:47:59  johana
  53  * Added del_fast_timer()
  54  *
  55  * Revision 1.3  2002/05/28 16:16:07  johana
  56  * Handle empty fast_timer_list
  57  *
  58  * Revision 1.2  2002/05/27 15:38:42  johana
  59  * Made it compile without warnings on Linux 2.4.
  60  * (includes, wait_queue, PROC_FS and snprintf)
  61  *
  62  * Revision 1.1  2002/05/27 15:32:25  johana
  63  * arch/etrax100/kernel/fasttimer.c v1.8 from the elinux tree.
  64  *
  65  * Revision 1.8  2001/11/27 13:50:40  pkj
  66  * Disable interrupts while stopping the timer and while modifying the
  67  * list of active timers in timer1_handler() as it may be interrupted
  68  * by other interrupts (e.g., the serial interrupt) which may add fast
  69  * timers.
  70  *
  71  * Revision 1.7  2001/11/22 11:50:32  pkj
  72  * * Only store information about the last 16 timers.
  73  * * proc_fasttimer_read() now uses an allocated buffer, since it
  74  *   requires more space than just a page even for only writing the
  75  *   last 16 timers. The buffer is only allocated on request, so
  76  *   unless /proc/fasttimer is read, it is never allocated.
  77  * * Renamed fast_timer_started to fast_timers_started to match
  78  *   fast_timers_added and fast_timers_expired.
  79  * * Some clean-up.
  80  *
  81  * Revision 1.6  2000/12/13 14:02:08  johana
  82  * Removed volatile for fast_timer_list
  83  *
  84  * Revision 1.5  2000/12/13 13:55:35  johana
  85  * Added DEBUG_LOG, added som cli() and cleanup
  86  *
  87  * Revision 1.4  2000/12/05 13:48:50  johana
  88  * Added range check when writing proc file, modified timer int handling
  89  *
  90  * Revision 1.3  2000/11/23 10:10:20  johana
  91  * More debug/logging possibilities.
  92  * Moved GET_JIFFIES_USEC() to timex.h and time.c
  93  *
  94  * Revision 1.2  2000/11/01 13:41:04  johana
  95  * Clean up and bugfixes.
  96  * Created new do_gettimeofday_fast() that gets a timeval struct
  97  * with time based on jiffies and *R_TIMER0_DATA, uses a table
  98  * for fast conversion of timer value to microseconds.
  99  * (Much faster the standard do_gettimeofday() and we don't really
 100  * wan't to use the true time - we wan't the "uptime" so timers don't screw up
 101  * when we change the time.
 102  * TODO: Add efficient support for continuous timers as well.
 103  *
 104  * Revision 1.1  2000/10/26 15:49:16  johana
 105  * Added fasttimer, highresolution timers.
 106  *
 107  * Copyright (C) 2000,2001 2002, 2003 Axis Communications AB, Lund, Sweden
 108  */
 109
 110 #include <linux/errno.h>
 111 #include <linux/sched.h>
 112 #include <linux/kernel.h>
 113 #include <linux/param.h>
 114 #include <linux/string.h>
 115 #include <linux/vmalloc.h>
 116 #include <linux/interrupt.h>
 117 #include <linux/time.h>
 118 #include <linux/delay.h>
 119
 120 #include <asm/irq.h>
 121 #include <asm/system.h>
 122
 123 #include <linux/version.h>
 124
 125 #include <asm/arch/hwregs/reg_map.h>
 126 #include <asm/arch/hwregs/reg_rdwr.h>
 127 #include <asm/arch/hwregs/timer_defs.h>
 128 #include <asm/fasttimer.h>
 129 #include <linux/proc_fs.h>
 130
 131 /*
 132  * timer0 is running at 100MHz and generating jiffies timer ticks
 133  * at 100 or 1000 HZ.
 134  * fasttimer gives an API that gives timers that expire "between" the jiffies
 135  * giving microsecond resolution (10 ns).
 136  * fasttimer uses reg_timer_rw_trig register to get interrupt when
 137  * r_time reaches a certain value.
 138  */
 139
 140
 141 #define DEBUG_LOG_INCLUDED
 142 #define FAST_TIMER_LOG
 143 //#define FAST_TIMER_TEST
 144
 145 #define FAST_TIMER_SANITY_CHECKS
 146
 147 #ifdef FAST_TIMER_SANITY_CHECKS
 148 #define SANITYCHECK(x) x
 149 static int sanity_failed = 0;
 150 #else
 151 #define SANITYCHECK(x)
 152 #endif
 153
 154 #define D1(x)
 155 #define D2(x)
 156 #define DP(x)
 157
 158 #define __INLINE__ inline
 159
 160 static int fast_timer_running = 0;
 161 static int fast_timers_added = 0;
 162 static int fast_timers_started = 0;
 163 static int fast_timers_expired = 0;
 164 static int fast_timers_deleted = 0;
 165 static int fast_timer_is_init = 0;
 166 static int fast_timer_ints = 0;
 167
 168 struct fast_timer *fast_timer_list = NULL;
 169
 170 #ifdef DEBUG_LOG_INCLUDED
 171 #define DEBUG_LOG_MAX 128
 172 static const char * debug_log_string[DEBUG_LOG_MAX];
 173 static unsigned long debug_log_value[DEBUG_LOG_MAX];
 174 static int debug_log_cnt = 0;
 175 static int debug_log_cnt_wrapped = 0;
 176
 177 #define DEBUG_LOG(string, value) \
 178 { \
 179   unsigned long log_flags; \
 180   local_irq_save(log_flags); \
 181   debug_log_string[debug_log_cnt] = (string); \
 182   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
 183   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
 184   { \
 185     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
 186     debug_log_cnt_wrapped = 1; \
 187   } \
 188   local_irq_restore(log_flags); \
 189 }
 190 #else
 191 #define DEBUG_LOG(string, value)
 192 #endif
 193
 194
 195 #define NUM_TIMER_STATS 16
 196 #ifdef FAST_TIMER_LOG
 197 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 198 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 199 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 200 #endif
 201
 202 int timer_div_settings[NUM_TIMER_STATS];
 203 int timer_delay_settings[NUM_TIMER_STATS];
 204
 205
 206 static void
 207 timer_trig_handler(void);
 208
 209
 210
 211 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 212 void __INLINE__ do_gettimeofday_fast(struct timeval *tv)
 213 {
 214   unsigned long sec = jiffies;
 215   unsigned long usec = GET_JIFFIES_USEC();
 216
 217   usec += (sec % HZ) * (1000000 / HZ);
 218   sec = sec / HZ;
 219
 220   if (usec > 1000000)
 221   {
 222     usec -= 1000000;
 223     sec++;
 224   }
 225   tv->tv_sec = sec;
 226   tv->tv_usec = usec;
 227 }
 228
 229 int __INLINE__ timeval_cmp(struct timeval *t0, struct timeval *t1)
 230 {
 231   if (t0->tv_sec < t1->tv_sec)
 232   {
 233     return -1;
 234   }
 235   else if (t0->tv_sec > t1->tv_sec)
 236   {
 237     return 1;
 238   }
 239   if (t0->tv_usec < t1->tv_usec)
 240   {
 241     return -1;
 242   }
 243   else if (t0->tv_usec > t1->tv_usec)
 244   {
 245     return 1;
 246   }
 247   return 0;
 248 }
 249
 250 /* Called with ints off */
 251 void __INLINE__ start_timer_trig(unsigned long delay_us)
 252 {
 253   reg_timer_rw_ack_intr ack_intr = { 0 };
 254   reg_timer_rw_intr_mask intr_mask;
 255   reg_timer_rw_trig trig;
 256   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 257   reg_timer_r_time r_time;
 258
 259   r_time = REG_RD(timer, regi_timer, r_time);
 260
 261   D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
 262             delay_us, freq_index, div));
 263   /* Clear trig irq */
 264   intr_mask = REG_RD(timer, regi_timer, rw_intr_mask);
 265   intr_mask.trig = 0;
 266   REG_WR(timer, regi_timer, rw_intr_mask, intr_mask);
 267
 268   /* Set timer values */
 269   /* r_time is 100MHz (10 ns resolution) */
 270   trig = r_time + delay_us*(1000/10);
 271
 272   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
 273   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 274
 275   /* Ack interrupt */
 276   ack_intr.trig = 1;
 277   REG_WR(timer, regi_timer, rw_ack_intr, ack_intr);
 278
 279   /* Start timer */
 280   REG_WR(timer, regi_timer, rw_trig, trig);
 281   trig_cfg.tmr = regk_timer_time;
 282   REG_WR(timer, regi_timer, rw_trig_cfg, trig_cfg);
 283
 284   /* Check if we have already passed the trig time */
 285   r_time = REG_RD(timer, regi_timer, r_time);
 286   if (r_time < trig) {
 287     /* No, Enable trig irq */
 288     intr_mask = REG_RD(timer, regi_timer, rw_intr_mask);
 289     intr_mask.trig = 1;
 290     REG_WR(timer, regi_timer, rw_intr_mask, intr_mask);
 291     fast_timers_started++;
 292     fast_timer_running = 1;
 293   }
 294   else
 295   {
 296     /* We have passed the time, disable trig point, ack intr */
 297     trig_cfg.tmr = regk_timer_off;
 298     REG_WR(timer, regi_timer, rw_trig_cfg, trig_cfg);
 299     REG_WR(timer, regi_timer, rw_ack_intr, ack_intr);
 300     /* call the int routine directly */
 301     timer_trig_handler();
 302   }
 303
 304 }
 305
 306 /* In version 1.4 this function takes 27 - 50 us */
 307 void start_one_shot_timer(struct fast_timer *t,
 308                           fast_timer_function_type *function,
 309                           unsigned long data,
 310                           unsigned long delay_us,
 311                           const char *name)
 312 {
 313   unsigned long flags;
 314   struct fast_timer *tmp;
 315
 316   D1(printk("sft %s %d us\n", name, delay_us));
 317
 318   local_irq_save(flags);
 319
 320   do_gettimeofday_fast(&t->tv_set);
 321   tmp = fast_timer_list;
 322
 323   SANITYCHECK({ /* Check so this is not in the list already... */
 324     while (tmp != NULL)
 325     {
 326       if (tmp == t)
 327       {
 328         printk("timer name: %s data: 0x%08lX already in list!\n", name, data);
 329         sanity_failed++;
 330         return;
 331       }
 332       else
 333       {
 334         tmp = tmp->next;
 335       }
 336     }
 337     tmp = fast_timer_list;
 338   });
 339
 340   t->delay_us = delay_us;
 341   t->function = function;
 342   t->data = data;
 343   t->name = name;
 344
 345   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 346   t->tv_expires.tv_sec  = t->tv_set.tv_sec  + delay_us / 1000000;
 347   if (t->tv_expires.tv_usec > 1000000)
 348   {
 349     t->tv_expires.tv_usec -= 1000000;
 350     t->tv_expires.tv_sec++;
 351   }
 352 #ifdef FAST_TIMER_LOG
 353   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 354 #endif
 355   fast_timers_added++;
 356
 357   /* Check if this should timeout before anything else */
 358   if (tmp == NULL || timeval_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 359   {
 360     /* Put first in list and modify the timer value */
 361     t->prev = NULL;
 362     t->next = fast_timer_list;
 363     if (fast_timer_list)
 364     {
 365       fast_timer_list->prev = t;
 366     }
 367     fast_timer_list = t;
 368 #ifdef FAST_TIMER_LOG
 369     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 370 #endif
 371     start_timer_trig(delay_us);
 372   } else {
 373     /* Put in correct place in list */
 374     while (tmp->next &&
 375            timeval_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 376     {
 377       tmp = tmp->next;
 378     }
 379     /* Insert t after tmp */
 380     t->prev = tmp;
 381     t->next = tmp->next;
 382     if (tmp->next)
 383     {
 384       tmp->next->prev = t;
 385     }
 386     tmp->next = t;
 387   }
 388
 389   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 390
 391   local_irq_restore(flags);
 392 } /* start_one_shot_timer */
 393
 394 static inline int fast_timer_pending (const struct fast_timer * t)
 395 {
 396   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 397 }
 398
 399 static inline int detach_fast_timer (struct fast_timer *t)
 400 {
 401   struct fast_timer *next, *prev;
 402   if (!fast_timer_pending(t))
 403     return 0;
 404   next = t->next;
 405   prev = t->prev;
 406   if (next)
 407     next->prev = prev;
 408   if (prev)
 409     prev->next = next;
 410   else
 411     fast_timer_list = next;
 412   fast_timers_deleted++;
 413   return 1;
 414 }
 415
 416 int del_fast_timer(struct fast_timer * t)
 417 {
 418   unsigned long flags;
 419   int ret;
 420
 421   local_irq_save(flags);
 422   ret = detach_fast_timer(t);
 423   t->next = t->prev = NULL;
 424   local_irq_restore(flags);
 425   return ret;
 426 } /* del_fast_timer */
 427
 428
 429 /* Interrupt routines or functions called in interrupt context */
 430
 431 /* Timer interrupt handler for trig interrupts */
 432
 433 static irqreturn_t
 434 timer_trig_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 435 {
 436   reg_timer_r_masked_intr masked_intr;
 437
 438   /* Check if the timer interrupt is for us (a trig int) */
 439   masked_intr = REG_RD(timer, regi_timer, r_masked_intr);
 440   if (!masked_intr.trig)
 441     return IRQ_NONE;
 442   timer_trig_handler();
 443   return IRQ_HANDLED;
 444 }
 445
 446 static void timer_trig_handler(void)
 447 {
 448   reg_timer_rw_ack_intr ack_intr = { 0 };
 449   reg_timer_rw_intr_mask intr_mask;
 450   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 451   struct fast_timer *t;
 452   unsigned long flags;
 453
 454   local_irq_save(flags);
 455
 456   /* Clear timer trig interrupt */
 457   intr_mask = REG_RD(timer, regi_timer, rw_intr_mask);
 458   intr_mask.trig = 0;
 459   REG_WR(timer, regi_timer, rw_intr_mask, intr_mask);
 460
 461   /* First stop timer, then ack interrupt */
 462   /* Stop timer */
 463   trig_cfg.tmr = regk_timer_off;
 464   REG_WR(timer, regi_timer, rw_trig_cfg, trig_cfg);
 465
 466   /* Ack interrupt */
 467   ack_intr.trig = 1;
 468   REG_WR(timer, regi_timer, rw_ack_intr, ack_intr);
 469
 470   fast_timer_running = 0;
 471   fast_timer_ints++;
 472
 473   local_irq_restore(flags);
 474
 475   t = fast_timer_list;
 476   while (t)
 477   {
 478     struct timeval tv;
 479
 480     /* Has it really expired? */
 481     do_gettimeofday_fast(&tv);
 482     D1(printk("t: %is %06ius\n", tv.tv_sec, tv.tv_usec));
 483
 484     if (timeval_cmp(&t->tv_expires, &tv) <= 0)
 485     {
 486       /* Yes it has expired */
 487 #ifdef FAST_TIMER_LOG
 488       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 489 #endif
 490       fast_timers_expired++;
 491
 492       /* Remove this timer before call, since it may reuse the timer */
 493       local_irq_save(flags);
 494       if (t->prev)
 495       {
 496         t->prev->next = t->next;
 497       }
 498       else
 499       {
 500         fast_timer_list = t->next;
 501       }
 502       if (t->next)
 503       {
 504         t->next->prev = t->prev;
 505       }
 506       t->prev = NULL;
 507       t->next = NULL;
 508       local_irq_restore(flags);
 509
 510       if (t->function != NULL)
 511       {
 512         t->function(t->data);
 513       }
 514       else
 515       {
 516         DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
 517       }
 518     }
 519     else
 520     {
 521       /* Timer is to early, let's set it again using the normal routines */
 522       D1(printk(".\n"));
 523     }
 524
 525     local_irq_save(flags);
 526     if ((t = fast_timer_list) != NULL)
 527     {
 528       /* Start next timer.. */
 529       long us;
 530       struct timeval tv;
 531
 532       do_gettimeofday_fast(&tv);
 533       us = ((t->tv_expires.tv_sec - tv.tv_sec) * 1000000 +
 534             t->tv_expires.tv_usec - tv.tv_usec);
 535       if (us > 0)
 536       {
 537         if (!fast_timer_running)
 538         {
 539 #ifdef FAST_TIMER_LOG
 540           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 541 #endif
 542           start_timer_trig(us);
 543         }
 544         local_irq_restore(flags);
 545         break;
 546       }
 547       else
 548       {
 549         /* Timer already expired, let's handle it better late than never.
 550          * The normal loop handles it
 551          */
 552         D1(printk("e! %d\n", us));
 553       }
 554     }
 555     local_irq_restore(flags);
 556   }
 557
 558   if (!t)
 559   {
 560     D1(printk("ttrig stop!\n"));
 561   }
 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 delay: %i"
 689                       "\n",
 690                       timer_div_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     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("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     printk("fast_timer_init()\n");
 953
 954 #ifdef CONFIG_PROC_FS
 955    if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 )))
 956      fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 957 #endif /* PROC_FS */
 958     if(request_irq(TIMER_INTR_VECT, timer_trig_interrupt, IRQF_DISABLED,
 959                    "fast timer int", NULL))
 960     {
 961       printk("err: timer1 irq\n");
 962     }
 963     fast_timer_is_init = 1;
 964 #ifdef FAST_TIMER_TEST
 965     printk("do test\n");
 966     fast_timer_test();
 967 #endif
 968   }
 969 }