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/config.h>
 124 #include <linux/version.h>
 125
 126 #include <asm/arch/hwregs/reg_map.h>
 127 #include <asm/arch/hwregs/reg_rdwr.h>
 128 #include <asm/arch/hwregs/timer_defs.h>
 129 #include <asm/fasttimer.h>
 130 #include <linux/proc_fs.h>
 131
 132 /*
 133  * timer0 is running at 100MHz and generating jiffies timer ticks
 134  * at 100 or 1000 HZ.
 135  * fasttimer gives an API that gives timers that expire "between" the jiffies
 136  * giving microsecond resolution (10 ns).
 137  * fasttimer uses reg_timer_rw_trig register to get interrupt when
 138  * r_time reaches a certain value.
 139  */
 140
 141
 142 #define DEBUG_LOG_INCLUDED
 143 #define FAST_TIMER_LOG
 144 //#define FAST_TIMER_TEST
 145
 146 #define FAST_TIMER_SANITY_CHECKS
 147
 148 #ifdef FAST_TIMER_SANITY_CHECKS
 149 #define SANITYCHECK(x) x
 150 static int sanity_failed = 0;
 151 #else
 152 #define SANITYCHECK(x)
 153 #endif
 154
 155 #define D1(x)
 156 #define D2(x)
 157 #define DP(x)
 158
 159 #define __INLINE__ inline
 160
 161 static int fast_timer_running = 0;
 162 static int fast_timers_added = 0;
 163 static int fast_timers_started = 0;
 164 static int fast_timers_expired = 0;
 165 static int fast_timers_deleted = 0;
 166 static int fast_timer_is_init = 0;
 167 static int fast_timer_ints = 0;
 168
 169 struct fast_timer *fast_timer_list = NULL;
 170
 171 #ifdef DEBUG_LOG_INCLUDED
 172 #define DEBUG_LOG_MAX 128
 173 static const char * debug_log_string[DEBUG_LOG_MAX];
 174 static unsigned long debug_log_value[DEBUG_LOG_MAX];
 175 static int debug_log_cnt = 0;
 176 static int debug_log_cnt_wrapped = 0;
 177
 178 #define DEBUG_LOG(string, value) \
 179 { \
 180   unsigned long log_flags; \
 181   local_irq_save(log_flags); \
 182   debug_log_string[debug_log_cnt] = (string); \
 183   debug_log_value[debug_log_cnt] = (unsigned long)(value); \
 184   if (++debug_log_cnt >= DEBUG_LOG_MAX) \
 185   { \
 186     debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
 187     debug_log_cnt_wrapped = 1; \
 188   } \
 189   local_irq_restore(log_flags); \
 190 }
 191 #else
 192 #define DEBUG_LOG(string, value)
 193 #endif
 194
 195
 196 #define NUM_TIMER_STATS 16
 197 #ifdef FAST_TIMER_LOG
 198 struct fast_timer timer_added_log[NUM_TIMER_STATS];
 199 struct fast_timer timer_started_log[NUM_TIMER_STATS];
 200 struct fast_timer timer_expired_log[NUM_TIMER_STATS];
 201 #endif
 202
 203 int timer_div_settings[NUM_TIMER_STATS];
 204 int timer_delay_settings[NUM_TIMER_STATS];
 205
 206
 207 static void
 208 timer_trig_handler(void);
 209
 210
 211
 212 /* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
 213 void __INLINE__ do_gettimeofday_fast(struct timeval *tv)
 214 {
 215   unsigned long sec = jiffies;
 216   unsigned long usec = GET_JIFFIES_USEC();
 217
 218   usec += (sec % HZ) * (1000000 / HZ);
 219   sec = sec / HZ;
 220
 221   if (usec > 1000000)
 222   {
 223     usec -= 1000000;
 224     sec++;
 225   }
 226   tv->tv_sec = sec;
 227   tv->tv_usec = usec;
 228 }
 229
 230 int __INLINE__ timeval_cmp(struct timeval *t0, struct timeval *t1)
 231 {
 232   if (t0->tv_sec < t1->tv_sec)
 233   {
 234     return -1;
 235   }
 236   else if (t0->tv_sec > t1->tv_sec)
 237   {
 238     return 1;
 239   }
 240   if (t0->tv_usec < t1->tv_usec)
 241   {
 242     return -1;
 243   }
 244   else if (t0->tv_usec > t1->tv_usec)
 245   {
 246     return 1;
 247   }
 248   return 0;
 249 }
 250
 251 /* Called with ints off */
 252 void __INLINE__ start_timer_trig(unsigned long delay_us)
 253 {
 254   reg_timer_rw_ack_intr ack_intr = { 0 };
 255   reg_timer_rw_intr_mask intr_mask;
 256   reg_timer_rw_trig trig;
 257   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 258   reg_timer_r_time r_time;
 259
 260   r_time = REG_RD(timer, regi_timer, r_time);
 261
 262   D1(printk("start_timer_trig : %d us freq: %i div: %i\n",
 263             delay_us, freq_index, div));
 264   /* Clear trig irq */
 265   intr_mask = REG_RD(timer, regi_timer, rw_intr_mask);
 266   intr_mask.trig = 0;
 267   REG_WR(timer, regi_timer, rw_intr_mask, intr_mask);
 268
 269   /* Set timer values */
 270   /* r_time is 100MHz (10 ns resolution) */
 271   trig = r_time + delay_us*(1000/10);
 272
 273   timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = trig;
 274   timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
 275
 276   /* Ack interrupt */
 277   ack_intr.trig = 1;
 278   REG_WR(timer, regi_timer, rw_ack_intr, ack_intr);
 279
 280   /* Start timer */
 281   REG_WR(timer, regi_timer, rw_trig, trig);
 282   trig_cfg.tmr = regk_timer_time;
 283   REG_WR(timer, regi_timer, rw_trig_cfg, trig_cfg);
 284
 285   /* Check if we have already passed the trig time */
 286   r_time = REG_RD(timer, regi_timer, r_time);
 287   if (r_time < trig) {
 288     /* No, Enable trig irq */
 289     intr_mask = REG_RD(timer, regi_timer, rw_intr_mask);
 290     intr_mask.trig = 1;
 291     REG_WR(timer, regi_timer, rw_intr_mask, intr_mask);
 292     fast_timers_started++;
 293     fast_timer_running = 1;
 294   }
 295   else
 296   {
 297     /* We have passed the time, disable trig point, ack intr */
 298     trig_cfg.tmr = regk_timer_off;
 299     REG_WR(timer, regi_timer, rw_trig_cfg, trig_cfg);
 300     REG_WR(timer, regi_timer, rw_ack_intr, ack_intr);
 301     /* call the int routine directly */
 302     timer_trig_handler();
 303   }
 304
 305 }
 306
 307 /* In version 1.4 this function takes 27 - 50 us */
 308 void start_one_shot_timer(struct fast_timer *t,
 309                           fast_timer_function_type *function,
 310                           unsigned long data,
 311                           unsigned long delay_us,
 312                           const char *name)
 313 {
 314   unsigned long flags;
 315   struct fast_timer *tmp;
 316
 317   D1(printk("sft %s %d us\n", name, delay_us));
 318
 319   local_irq_save(flags);
 320
 321   do_gettimeofday_fast(&t->tv_set);
 322   tmp = fast_timer_list;
 323
 324   SANITYCHECK({ /* Check so this is not in the list already... */
 325     while (tmp != NULL)
 326     {
 327       if (tmp == t)
 328       {
 329         printk("timer name: %s data: 0x%08lX already in list!\n", name, data);
 330         sanity_failed++;
 331         return;
 332       }
 333       else
 334       {
 335         tmp = tmp->next;
 336       }
 337     }
 338     tmp = fast_timer_list;
 339   });
 340
 341   t->delay_us = delay_us;
 342   t->function = function;
 343   t->data = data;
 344   t->name = name;
 345
 346   t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
 347   t->tv_expires.tv_sec  = t->tv_set.tv_sec  + delay_us / 1000000;
 348   if (t->tv_expires.tv_usec > 1000000)
 349   {
 350     t->tv_expires.tv_usec -= 1000000;
 351     t->tv_expires.tv_sec++;
 352   }
 353 #ifdef FAST_TIMER_LOG
 354   timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
 355 #endif
 356   fast_timers_added++;
 357
 358   /* Check if this should timeout before anything else */
 359   if (tmp == NULL || timeval_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
 360   {
 361     /* Put first in list and modify the timer value */
 362     t->prev = NULL;
 363     t->next = fast_timer_list;
 364     if (fast_timer_list)
 365     {
 366       fast_timer_list->prev = t;
 367     }
 368     fast_timer_list = t;
 369 #ifdef FAST_TIMER_LOG
 370     timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 371 #endif
 372     start_timer_trig(delay_us);
 373   } else {
 374     /* Put in correct place in list */
 375     while (tmp->next &&
 376            timeval_cmp(&t->tv_expires, &tmp->next->tv_expires) > 0)
 377     {
 378       tmp = tmp->next;
 379     }
 380     /* Insert t after tmp */
 381     t->prev = tmp;
 382     t->next = tmp->next;
 383     if (tmp->next)
 384     {
 385       tmp->next->prev = t;
 386     }
 387     tmp->next = t;
 388   }
 389
 390   D2(printk("start_one_shot_timer: %d us done\n", delay_us));
 391
 392   local_irq_restore(flags);
 393 } /* start_one_shot_timer */
 394
 395 static inline int fast_timer_pending (const struct fast_timer * t)
 396 {
 397   return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
 398 }
 399
 400 static inline int detach_fast_timer (struct fast_timer *t)
 401 {
 402   struct fast_timer *next, *prev;
 403   if (!fast_timer_pending(t))
 404     return 0;
 405   next = t->next;
 406   prev = t->prev;
 407   if (next)
 408     next->prev = prev;
 409   if (prev)
 410     prev->next = next;
 411   else
 412     fast_timer_list = next;
 413   fast_timers_deleted++;
 414   return 1;
 415 }
 416
 417 int del_fast_timer(struct fast_timer * t)
 418 {
 419   unsigned long flags;
 420   int ret;
 421
 422   local_irq_save(flags);
 423   ret = detach_fast_timer(t);
 424   t->next = t->prev = NULL;
 425   local_irq_restore(flags);
 426   return ret;
 427 } /* del_fast_timer */
 428
 429
 430 /* Interrupt routines or functions called in interrupt context */
 431
 432 /* Timer interrupt handler for trig interrupts */
 433
 434 static irqreturn_t
 435 timer_trig_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 436 {
 437   reg_timer_r_masked_intr masked_intr;
 438
 439   /* Check if the timer interrupt is for us (a trig int) */
 440   masked_intr = REG_RD(timer, regi_timer, r_masked_intr);
 441   if (!masked_intr.trig)
 442     return IRQ_NONE;
 443   timer_trig_handler();
 444   return IRQ_HANDLED;
 445 }
 446
 447 static void timer_trig_handler(void)
 448 {
 449   reg_timer_rw_ack_intr ack_intr = { 0 };
 450   reg_timer_rw_intr_mask intr_mask;
 451   reg_timer_rw_trig_cfg trig_cfg = { 0 };
 452   struct fast_timer *t;
 453   unsigned long flags;
 454
 455   local_irq_save(flags);
 456
 457   /* Clear timer trig interrupt */
 458   intr_mask = REG_RD(timer, regi_timer, rw_intr_mask);
 459   intr_mask.trig = 0;
 460   REG_WR(timer, regi_timer, rw_intr_mask, intr_mask);
 461
 462   /* First stop timer, then ack interrupt */
 463   /* Stop timer */
 464   trig_cfg.tmr = regk_timer_off;
 465   REG_WR(timer, regi_timer, rw_trig_cfg, trig_cfg);
 466
 467   /* Ack interrupt */
 468   ack_intr.trig = 1;
 469   REG_WR(timer, regi_timer, rw_ack_intr, ack_intr);
 470
 471   fast_timer_running = 0;
 472   fast_timer_ints++;
 473
 474   local_irq_restore(flags);
 475
 476   t = fast_timer_list;
 477   while (t)
 478   {
 479     struct timeval tv;
 480
 481     /* Has it really expired? */
 482     do_gettimeofday_fast(&tv);
 483     D1(printk("t: %is %06ius\n", tv.tv_sec, tv.tv_usec));
 484
 485     if (timeval_cmp(&t->tv_expires, &tv) <= 0)
 486     {
 487       /* Yes it has expired */
 488 #ifdef FAST_TIMER_LOG
 489       timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
 490 #endif
 491       fast_timers_expired++;
 492
 493       /* Remove this timer before call, since it may reuse the timer */
 494       local_irq_save(flags);
 495       if (t->prev)
 496       {
 497         t->prev->next = t->next;
 498       }
 499       else
 500       {
 501         fast_timer_list = t->next;
 502       }
 503       if (t->next)
 504       {
 505         t->next->prev = t->prev;
 506       }
 507       t->prev = NULL;
 508       t->next = NULL;
 509       local_irq_restore(flags);
 510
 511       if (t->function != NULL)
 512       {
 513         t->function(t->data);
 514       }
 515       else
 516       {
 517         DEBUG_LOG("!trimertrig %i function==NULL!\n", fast_timer_ints);
 518       }
 519     }
 520     else
 521     {
 522       /* Timer is to early, let's set it again using the normal routines */
 523       D1(printk(".\n"));
 524     }
 525
 526     local_irq_save(flags);
 527     if ((t = fast_timer_list) != NULL)
 528     {
 529       /* Start next timer.. */
 530       long us;
 531       struct timeval tv;
 532
 533       do_gettimeofday_fast(&tv);
 534       us = ((t->tv_expires.tv_sec - tv.tv_sec) * 1000000 +
 535             t->tv_expires.tv_usec - tv.tv_usec);
 536       if (us > 0)
 537       {
 538         if (!fast_timer_running)
 539         {
 540 #ifdef FAST_TIMER_LOG
 541           timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
 542 #endif
 543           start_timer_trig(us);
 544         }
 545         local_irq_restore(flags);
 546         break;
 547       }
 548       else
 549       {
 550         /* Timer already expired, let's handle it better late than never.
 551          * The normal loop handles it
 552          */
 553         D1(printk("e! %d\n", us));
 554       }
 555     }
 556     local_irq_restore(flags);
 557   }
 558
 559   if (!t)
 560   {
 561     D1(printk("ttrig stop!\n"));
 562   }
 563 }
 564
 565 static void wake_up_func(unsigned long data)
 566 {
 567 #ifdef DECLARE_WAITQUEUE
 568   wait_queue_head_t  *sleep_wait_p = (wait_queue_head_t*)data;
 569 #else
 570   struct wait_queue **sleep_wait_p = (struct wait_queue **)data;
 571 #endif
 572   wake_up(sleep_wait_p);
 573 }
 574
 575
 576 /* Useful API */
 577
 578 void schedule_usleep(unsigned long us)
 579 {
 580   struct fast_timer t;
 581 #ifdef DECLARE_WAITQUEUE
 582   wait_queue_head_t sleep_wait;
 583   init_waitqueue_head(&sleep_wait);
 584   {
 585   DECLARE_WAITQUEUE(wait, current);
 586 #else
 587   struct wait_queue *sleep_wait = NULL;
 588   struct wait_queue wait = { current, NULL };
 589 #endif
 590
 591   D1(printk("schedule_usleep(%d)\n", us));
 592   add_wait_queue(&sleep_wait, &wait);
 593   set_current_state(TASK_INTERRUPTIBLE);
 594   start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
 595                        "usleep");
 596   schedule();
 597   set_current_state(TASK_RUNNING);
 598   remove_wait_queue(&sleep_wait, &wait);
 599   D1(printk("done schedule_usleep(%d)\n", us));
 600 #ifdef DECLARE_WAITQUEUE
 601   }
 602 #endif
 603 }
 604
 605 #ifdef CONFIG_PROC_FS
 606 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 607 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
 608                        ,int *eof, void *data_unused
 609 #else
 610                         ,int unused
 611 #endif
 612                                );
 613 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
 614 static struct proc_dir_entry *fasttimer_proc_entry;
 615 #else
 616 static struct proc_dir_entry fasttimer_proc_entry =
 617 {
 618   0, 9, "fasttimer",
 619   S_IFREG | S_IRUGO, 1, 0, 0,
 620   0, NULL /* ops -- default to array */,
 621   &proc_fasttimer_read /* get_info */,
 622 };
 623 #endif
 624 #endif /* CONFIG_PROC_FS */
 625
 626 #ifdef CONFIG_PROC_FS
 627
 628 /* This value is very much based on testing */
 629 #define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
 630
 631 static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
 632 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
 633                        ,int *eof, void *data_unused
 634 #else
 635                         ,int unused
 636 #endif
 637                                )
 638 {
 639   unsigned long flags;
 640   int i = 0;
 641   int num_to_show;
 642   struct timeval tv;
 643   struct fast_timer *t, *nextt;
 644   static char *bigbuf = NULL;
 645   static unsigned long used;
 646
 647   if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE)))
 648   {
 649     used = 0;
 650     bigbuf[0] = '\0';
 651     return 0;
 652   }
 653
 654   if (!offset || !used)
 655   {
 656     do_gettimeofday_fast(&tv);
 657
 658     used = 0;
 659     used += sprintf(bigbuf + used, "Fast timers added:     %i\n",
 660                     fast_timers_added);
 661     used += sprintf(bigbuf + used, "Fast timers started:   %i\n",
 662                     fast_timers_started);
 663     used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
 664                     fast_timer_ints);
 665     used += sprintf(bigbuf + used, "Fast timers expired:   %i\n",
 666                     fast_timers_expired);
 667     used += sprintf(bigbuf + used, "Fast timers deleted:   %i\n",
 668                     fast_timers_deleted);
 669     used += sprintf(bigbuf + used, "Fast timer running:    %s\n",
 670                     fast_timer_running ? "yes" : "no");
 671     used += sprintf(bigbuf + used, "Current time:          %lu.%06lu\n",
 672                     (unsigned long)tv.tv_sec,
 673                     (unsigned long)tv.tv_usec);
 674 #ifdef FAST_TIMER_SANITY_CHECKS
 675     used += sprintf(bigbuf + used, "Sanity failed:         %i\n",
 676                     sanity_failed);
 677 #endif
 678     used += sprintf(bigbuf + used, "\n");
 679
 680 #ifdef DEBUG_LOG_INCLUDED
 681     {
 682       int end_i = debug_log_cnt;
 683       i = 0;
 684
 685       if (debug_log_cnt_wrapped)
 686       {
 687         i = debug_log_cnt;
 688       }
 689
 690       while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
 691              used+100 < BIG_BUF_SIZE)
 692       {
 693         used += sprintf(bigbuf + used, debug_log_string[i],
 694                         debug_log_value[i]);
 695         i = (i+1) % DEBUG_LOG_MAX;
 696       }
 697     }
 698     used += sprintf(bigbuf + used, "\n");
 699 #endif
 700
 701     num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
 702                    NUM_TIMER_STATS);
 703     used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
 704     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
 705     {
 706       int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
 707
 708 #if 1 //ndef FAST_TIMER_LOG
 709       used += sprintf(bigbuf + used, "div: %i delay: %i"
 710                       "\n",
 711                       timer_div_settings[cur],
 712                       timer_delay_settings[cur]
 713                       );
 714 #endif
 715 #ifdef FAST_TIMER_LOG
 716       t = &timer_started_log[cur];
 717       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 718                       "d: %6li us data: 0x%08lX"
 719                       "\n",
 720                       t->name,
 721                       (unsigned long)t->tv_set.tv_sec,
 722                       (unsigned long)t->tv_set.tv_usec,
 723                       (unsigned long)t->tv_expires.tv_sec,
 724                       (unsigned long)t->tv_expires.tv_usec,
 725                       t->delay_us,
 726                       t->data
 727                       );
 728 #endif
 729     }
 730     used += sprintf(bigbuf + used, "\n");
 731
 732 #ifdef FAST_TIMER_LOG
 733     num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
 734                    NUM_TIMER_STATS);
 735     used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
 736     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 737     {
 738       t = &timer_added_log[(fast_timers_added - 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
 753     num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
 754                    NUM_TIMER_STATS);
 755     used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
 756     for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
 757     {
 758       t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
 759       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 760                       "d: %6li us data: 0x%08lX"
 761                       "\n",
 762                       t->name,
 763                       (unsigned long)t->tv_set.tv_sec,
 764                       (unsigned long)t->tv_set.tv_usec,
 765                       (unsigned long)t->tv_expires.tv_sec,
 766                       (unsigned long)t->tv_expires.tv_usec,
 767                       t->delay_us,
 768                       t->data
 769                       );
 770     }
 771     used += sprintf(bigbuf + used, "\n");
 772 #endif
 773
 774     used += sprintf(bigbuf + used, "Active timers:\n");
 775     local_irq_save(flags);
 776     local_irq_save(flags);
 777     t = fast_timer_list;
 778     while (t != NULL && (used+100 < BIG_BUF_SIZE))
 779     {
 780       nextt = t->next;
 781       local_irq_restore(flags);
 782       used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
 783                       "d: %6li us data: 0x%08lX"
 784 /*                      " func: 0x%08lX" */
 785                       "\n",
 786                       t->name,
 787                       (unsigned long)t->tv_set.tv_sec,
 788                       (unsigned long)t->tv_set.tv_usec,
 789                       (unsigned long)t->tv_expires.tv_sec,
 790                       (unsigned long)t->tv_expires.tv_usec,
 791                       t->delay_us,
 792                       t->data
 793 /*                      , t->function */
 794                       );
 795       local_irq_disable();
 796       if (t->next != nextt)
 797       {
 798         printk("timer removed!\n");
 799       }
 800       t = nextt;
 801     }
 802     local_irq_restore(flags);
 803   }
 804
 805   if (used - offset < len)
 806   {
 807     len = used - offset;
 808   }
 809
 810   memcpy(buf, bigbuf + offset, len);
 811   *start = buf;
 812 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
 813   *eof = 1;
 814 #endif
 815
 816   return len;
 817 }
 818 #endif /* PROC_FS */
 819
 820 #ifdef FAST_TIMER_TEST
 821 static volatile unsigned long i = 0;
 822 static volatile int num_test_timeout = 0;
 823 static struct fast_timer tr[10];
 824 static int exp_num[10];
 825
 826 static struct timeval tv_exp[100];
 827
 828 static void test_timeout(unsigned long data)
 829 {
 830   do_gettimeofday_fast(&tv_exp[data]);
 831   exp_num[data] = num_test_timeout;
 832
 833   num_test_timeout++;
 834 }
 835
 836 static void test_timeout1(unsigned long data)
 837 {
 838   do_gettimeofday_fast(&tv_exp[data]);
 839   exp_num[data] = num_test_timeout;
 840   if (data < 7)
 841   {
 842     start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
 843     i++;
 844   }
 845   num_test_timeout++;
 846 }
 847
 848 DP(
 849 static char buf0[2000];
 850 static char buf1[2000];
 851 static char buf2[2000];
 852 static char buf3[2000];
 853 static char buf4[2000];
 854 );
 855
 856 static char buf5[6000];
 857 static int j_u[1000];
 858
 859 static void fast_timer_test(void)
 860 {
 861   int prev_num;
 862   int j;
 863
 864   struct timeval tv, tv0, tv1, tv2;
 865
 866   printk("fast_timer_test() start\n");
 867   do_gettimeofday_fast(&tv);
 868
 869   for (j = 0; j < 1000; j++)
 870   {
 871     j_u[j] = GET_JIFFIES_USEC();
 872   }
 873   for (j = 0; j < 100; j++)
 874   {
 875     do_gettimeofday_fast(&tv_exp[j]);
 876   }
 877   printk("fast_timer_test() %is %06i\n", tv.tv_sec, tv.tv_usec);
 878
 879   for (j = 0; j < 1000; j++)
 880   {
 881     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]);
 882     j += 4;
 883   }
 884   for (j = 0; j < 100; j++)
 885   {
 886     printk("%i.%i %i.%i %i.%i %i.%i %i.%i\n",
 887            tv_exp[j].tv_sec,tv_exp[j].tv_usec,
 888            tv_exp[j+1].tv_sec,tv_exp[j+1].tv_usec,
 889            tv_exp[j+2].tv_sec,tv_exp[j+2].tv_usec,
 890            tv_exp[j+3].tv_sec,tv_exp[j+3].tv_usec,
 891            tv_exp[j+4].tv_sec,tv_exp[j+4].tv_usec);
 892     j += 4;
 893   }
 894   do_gettimeofday_fast(&tv0);
 895   start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
 896   DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
 897   i++;
 898   start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
 899   DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
 900   i++;
 901   start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
 902   DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
 903   i++;
 904   start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
 905   DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
 906   i++;
 907   start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
 908   DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
 909   i++;
 910   do_gettimeofday_fast(&tv1);
 911
 912   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 913
 914   prev_num = num_test_timeout;
 915   while (num_test_timeout < i)
 916   {
 917     if (num_test_timeout != prev_num)
 918     {
 919       prev_num = num_test_timeout;
 920     }
 921   }
 922   do_gettimeofday_fast(&tv2);
 923   printk("Timers started    %is %06i\n", tv0.tv_sec, tv0.tv_usec);
 924   printk("Timers started at %is %06i\n", tv1.tv_sec, tv1.tv_usec);
 925   printk("Timers done       %is %06i\n", tv2.tv_sec, tv2.tv_usec);
 926   DP(printk("buf0:\n");
 927      printk(buf0);
 928      printk("buf1:\n");
 929      printk(buf1);
 930      printk("buf2:\n");
 931      printk(buf2);
 932      printk("buf3:\n");
 933      printk(buf3);
 934      printk("buf4:\n");
 935      printk(buf4);
 936   );
 937   printk("buf5:\n");
 938   printk(buf5);
 939
 940   printk("timers set:\n");
 941   for(j = 0; j<i; j++)
 942   {
 943     struct fast_timer *t = &tr[j];
 944     printk("%-10s set: %6is %06ius exp: %6is %06ius "
 945            "data: 0x%08X func: 0x%08X\n",
 946            t->name,
 947            t->tv_set.tv_sec,
 948            t->tv_set.tv_usec,
 949            t->tv_expires.tv_sec,
 950            t->tv_expires.tv_usec,
 951            t->data,
 952            t->function
 953            );
 954
 955     printk("           del: %6ius     did exp: %6is %06ius as #%i error: %6li\n",
 956            t->delay_us,
 957            tv_exp[j].tv_sec,
 958            tv_exp[j].tv_usec,
 959            exp_num[j],
 960            (tv_exp[j].tv_sec - t->tv_expires.tv_sec)*1000000 + tv_exp[j].tv_usec - t->tv_expires.tv_usec);
 961   }
 962   proc_fasttimer_read(buf5, NULL, 0, 0, 0);
 963   printk("buf5 after all done:\n");
 964   printk(buf5);
 965   printk("fast_timer_test() done\n");
 966 }
 967 #endif
 968
 969
 970 void fast_timer_init(void)
 971 {
 972   /* For some reason, request_irq() hangs when called froom time_init() */
 973   if (!fast_timer_is_init)
 974   {
 975     printk("fast_timer_init()\n");
 976
 977 #ifdef CONFIG_PROC_FS
 978 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
 979    if ((fasttimer_proc_entry = create_proc_entry( "fasttimer", 0, 0 )))
 980      fasttimer_proc_entry->read_proc = proc_fasttimer_read;
 981 #else
 982     proc_register_dynamic(&proc_root, &fasttimer_proc_entry);
 983 #endif
 984 #endif /* PROC_FS */
 985     if(request_irq(TIMER_INTR_VECT, timer_trig_interrupt, SA_INTERRUPT,
 986                    "fast timer int", NULL))
 987     {
 988       printk("err: timer1 irq\n");
 989     }
 990     fast_timer_is_init = 1;
 991 #ifdef FAST_TIMER_TEST
 992     printk("do test\n");
 993     fast_timer_test();
 994 #endif
 995   }
 996 }