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