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[mirror_ubuntu-focal-kernel.git] / arch / cris / arch-v10 / kernel / fasttimer.c
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d8e5219f 1/*
1da177e4
LT		 2 * linux/arch/cris/kernel/fasttimer.c
3 *
4 * Fast timers for ETRAX100/ETRAX100LX
1da177e4 5 *
d8e5219f 6 * Copyright (C) 2000-2007 Axis Communications AB, Lund, Sweden
1da177e4
LT		 7 */
8
9#include <linux/errno.h>
10#include <linux/sched.h>
11#include <linux/kernel.h>
12#include <linux/param.h>
13#include <linux/string.h>
14#include <linux/mm.h>
15#include <linux/vmalloc.h>
16#include <linux/interrupt.h>
17#include <linux/time.h>
18#include <linux/delay.h>
19
20#include <asm/segment.h>
21#include <asm/io.h>
22#include <asm/irq.h>
23#include <asm/delay.h>
1da177e4 24
556dcee7 25#include <arch/svinto.h>
1da177e4
LT		 26#include <asm/fasttimer.h>
27#include <linux/proc_fs.h>
28
29
30#define DEBUG_LOG_INCLUDED
31#define FAST_TIMER_LOG
4200c35d 32/* #define FAST_TIMER_TEST */
1da177e4
LT		 33
34#define FAST_TIMER_SANITY_CHECKS
35
36#ifdef FAST_TIMER_SANITY_CHECKS
d8e5219f 37static int sanity_failed;
1da177e4
LT		 38#endif
39
40#define D1(x)
41#define D2(x)
42#define DP(x)
43
d8e5219f
JN		 44static unsigned int fast_timer_running;
45static unsigned int fast_timers_added;
46static unsigned int fast_timers_started;
47static unsigned int fast_timers_expired;
48static unsigned int fast_timers_deleted;
49static unsigned int fast_timer_is_init;
50static unsigned int fast_timer_ints;
1da177e4
LT		 51
52struct fast_timer *fast_timer_list = NULL;
53
54#ifdef DEBUG_LOG_INCLUDED
55#define DEBUG_LOG_MAX 128
56static const char * debug_log_string[DEBUG_LOG_MAX];
57static unsigned long debug_log_value[DEBUG_LOG_MAX];
d8e5219f
JN		 58static unsigned int debug_log_cnt;
59static unsigned int debug_log_cnt_wrapped;
1da177e4
LT		 60
61#define DEBUG_LOG(string, value) \
62{ \
63 unsigned long log_flags; \
7e920426 64 local_irq_save(log_flags); \
1da177e4
LT		 65 debug_log_string[debug_log_cnt] = (string); \
66 debug_log_value[debug_log_cnt] = (unsigned long)(value); \
67 if (++debug_log_cnt >= DEBUG_LOG_MAX) \
68 { \
69 debug_log_cnt = debug_log_cnt % DEBUG_LOG_MAX; \
70 debug_log_cnt_wrapped = 1; \
71 } \
7e920426 72 local_irq_restore(log_flags); \
1da177e4
LT		 73}
74#else
75#define DEBUG_LOG(string, value)
76#endif
77
78
79/* The frequencies for index = clkselx number in R_TIMER_CTRL */
80#define NUM_TIMER_FREQ 15
81#define MAX_USABLE_TIMER_FREQ 7
82#define MAX_DELAY_US 853333L
83const unsigned long timer_freq_100[NUM_TIMER_FREQ] =
84{
85 3, /* 0 3333 - 853333 us */
86 6, /* 1 1666 - 426666 us */
87 12, /* 2 833 - 213333 us */
88 24, /* 3 416 - 106666 us */
89 48, /* 4 208 - 53333 us */
90 96, /* 5 104 - 26666 us */
91 192, /* 6 52 - 13333 us */
92 384, /* 7 26 - 6666 us */
93 576,
94 1152,
95 2304,
96 4608,
97 9216,
98 18432,
99 62500,
100 /* 15 = cascade */
101};
102#define NUM_TIMER_STATS 16
103#ifdef FAST_TIMER_LOG
104struct fast_timer timer_added_log[NUM_TIMER_STATS];
105struct fast_timer timer_started_log[NUM_TIMER_STATS];
106struct fast_timer timer_expired_log[NUM_TIMER_STATS];
107#endif
108
109int timer_div_settings[NUM_TIMER_STATS];
110int timer_freq_settings[NUM_TIMER_STATS];
111int timer_delay_settings[NUM_TIMER_STATS];
112
113/* Not true gettimeofday, only checks the jiffies (uptime) + useconds */
2f1f53bd 114inline void do_gettimeofday_fast(struct fasttime_t *tv)
1da177e4 115{
d8e5219f
JN		 116 tv->tv_jiff = jiffies;
117 tv->tv_usec = GET_JIFFIES_USEC();
1da177e4
LT		 118}
119
2f1f53bd 120inline int fasttime_cmp(struct fasttime_t *t0, struct fasttime_t *t1)
1da177e4 121{
d8e5219f
JN		 122 /* Compare jiffies. Takes care of wrapping */
123 if (time_before(t0->tv_jiff, t1->tv_jiff))
124 return -1;
125 else if (time_after(t0->tv_jiff, t1->tv_jiff))
126 return 1;
127
128 /* Compare us */
129 if (t0->tv_usec < t1->tv_usec)
130 return -1;
131 else if (t0->tv_usec > t1->tv_usec)
132 return 1;
133 return 0;
1da177e4
LT		 134}
135
2f1f53bd 136inline void start_timer1(unsigned long delay_us)
1da177e4
LT		 137{
138 int freq_index = 0; /* This is the lowest resolution */
139 unsigned long upper_limit = MAX_DELAY_US;
140
141 unsigned long div;
142 /* Start/Restart the timer to the new shorter value */
143 /* t = 1/freq = 1/19200 = 53us
144 * T=div*t, div = T/t = delay_us*freq/1000000
145 */
146#if 1 /* Adaptive timer settings */
147 while (delay_us < upper_limit && freq_index < MAX_USABLE_TIMER_FREQ)
148 {
149 freq_index++;
150 upper_limit >>= 1; /* Divide by 2 using shift */
151 }
152 if (freq_index > 0)
153 {
154 freq_index--;
155 }
156#else
157 freq_index = 6;
158#endif
159 div = delay_us * timer_freq_100[freq_index]/10000;
160 if (div < 2)
161 {
162 /* Maybe increase timer freq? */
163 div = 2;
164 }
165 if (div > 255)
166 {
167 div = 0; /* This means 256, the max the timer takes */
168 /* If a longer timeout than the timer can handle is used,
169 * then we must restart it when it goes off.
170 */
171 }
172
173 timer_div_settings[fast_timers_started % NUM_TIMER_STATS] = div;
174 timer_freq_settings[fast_timers_started % NUM_TIMER_STATS] = freq_index;
175 timer_delay_settings[fast_timers_started % NUM_TIMER_STATS] = delay_us;
176
d8e5219f 177 D1(printk(KERN_DEBUG "start_timer1 : %d us freq: %i div: %i\n",
1da177e4
LT		 178 delay_us, freq_index, div));
179 /* Clear timer1 irq */
180 *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
181
182 /* Set timer values */
183 *R_TIMER_CTRL = r_timer_ctrl_shadow =
184 (r_timer_ctrl_shadow &
185 ~IO_MASK(R_TIMER_CTRL, timerdiv1) &
186 ~IO_MASK(R_TIMER_CTRL, tm1) &
187 ~IO_MASK(R_TIMER_CTRL, clksel1)) |
188 IO_FIELD(R_TIMER_CTRL, timerdiv1, div) |
189 IO_STATE(R_TIMER_CTRL, tm1, stop_ld) |
190 IO_FIELD(R_TIMER_CTRL, clksel1, freq_index ); /* 6=c19k2Hz */
191
192 /* Ack interrupt */
193 *R_TIMER_CTRL = r_timer_ctrl_shadow |
194 IO_STATE(R_TIMER_CTRL, i1, clr);
195
196 /* Start timer */
197 *R_TIMER_CTRL = r_timer_ctrl_shadow =
198 (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
199 IO_STATE(R_TIMER_CTRL, tm1, run);
200
201 /* Enable timer1 irq */
202 *R_IRQ_MASK0_SET = IO_STATE(R_IRQ_MASK0_SET, timer1, set);
203 fast_timers_started++;
204 fast_timer_running = 1;
205}
206
207/* In version 1.4 this function takes 27 - 50 us */
208void start_one_shot_timer(struct fast_timer *t,
209 fast_timer_function_type *function,
210 unsigned long data,
211 unsigned long delay_us,
212 const char *name)
213{
214 unsigned long flags;
215 struct fast_timer *tmp;
216
217 D1(printk("sft %s %d us\n", name, delay_us));
218
7e920426 219 local_irq_save(flags);
1da177e4
LT		 220
221 do_gettimeofday_fast(&t->tv_set);
222 tmp = fast_timer_list;
223
4200c35d
JN		 224#ifdef FAST_TIMER_SANITY_CHECKS
225 /* Check so this is not in the list already... */
226 while (tmp != NULL) {
227 if (tmp == t) {
228 printk(KERN_WARNING "timer name: %s data: "
229 "0x%08lX already in list!\n", name, data);
230 sanity_failed++;
231 goto done;
232 } else
233 tmp = tmp->next;
234 }
235 tmp = fast_timer_list;
236#endif
1da177e4
LT		 237
238 t->delay_us = delay_us;
239 t->function = function;
240 t->data = data;
241 t->name = name;
242
243 t->tv_expires.tv_usec = t->tv_set.tv_usec + delay_us % 1000000;
d8e5219f 244 t->tv_expires.tv_jiff = t->tv_set.tv_jiff + delay_us / 1000000 / HZ;
1da177e4
LT		 245 if (t->tv_expires.tv_usec > 1000000)
246 {
247 t->tv_expires.tv_usec -= 1000000;
d8e5219f 248 t->tv_expires.tv_jiff += HZ;
1da177e4
LT		 249 }
250#ifdef FAST_TIMER_LOG
251 timer_added_log[fast_timers_added % NUM_TIMER_STATS] = *t;
252#endif
253 fast_timers_added++;
254
255 /* Check if this should timeout before anything else */
2f1f53bd 256 if (tmp == NULL || fasttime_cmp(&t->tv_expires, &tmp->tv_expires) < 0)
1da177e4
LT		 257 {
258 /* Put first in list and modify the timer value */
259 t->prev = NULL;
260 t->next = fast_timer_list;
261 if (fast_timer_list)
262 {
263 fast_timer_list->prev = t;
264 }
265 fast_timer_list = t;
266#ifdef FAST_TIMER_LOG
267 timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
268#endif
269 start_timer1(delay_us);
270 } else {
271 /* Put in correct place in list */
2f1f53bd
JN		 272 while (tmp->next && fasttime_cmp(&t->tv_expires,
273 &tmp->next->tv_expires) > 0)
1da177e4
LT		 274 {
275 tmp = tmp->next;
276 }
277 /* Insert t after tmp */
278 t->prev = tmp;
279 t->next = tmp->next;
280 if (tmp->next)
281 {
282 tmp->next->prev = t;
283 }
284 tmp->next = t;
285 }
286
287 D2(printk("start_one_shot_timer: %d us done\n", delay_us));
288
d8e5219f 289done:
7e920426 290 local_irq_restore(flags);
1da177e4
LT		 291} /* start_one_shot_timer */
292
293static inline int fast_timer_pending (const struct fast_timer * t)
294{
295 return (t->next != NULL) || (t->prev != NULL) || (t == fast_timer_list);
296}
297
298static inline int detach_fast_timer (struct fast_timer *t)
299{
300 struct fast_timer *next, *prev;
301 if (!fast_timer_pending(t))
302 return 0;
303 next = t->next;
304 prev = t->prev;
305 if (next)
306 next->prev = prev;
307 if (prev)
308 prev->next = next;
309 else
310 fast_timer_list = next;
311 fast_timers_deleted++;
312 return 1;
313}
314
315int del_fast_timer(struct fast_timer * t)
316{
317 unsigned long flags;
318 int ret;
319
7e920426 320 local_irq_save(flags);
1da177e4
LT		 321 ret = detach_fast_timer(t);
322 t->next = t->prev = NULL;
7e920426 323 local_irq_restore(flags);
1da177e4
LT		 324 return ret;
325} /* del_fast_timer */
326
327
328/* Interrupt routines or functions called in interrupt context */
329
330/* Timer 1 interrupt handler */
331
332static irqreturn_t
d8e5219f 333timer1_handler(int irq, void *dev_id)
1da177e4
LT		 334{
335 struct fast_timer *t;
336 unsigned long flags;
337
d8e5219f
JN		 338 /* We keep interrupts disabled not only when we modify the
339 * fast timer list, but any time we hold a reference to a
340 * timer in the list, since del_fast_timer may be called
341 * from (another) interrupt context. Thus, the only time
342 * when interrupts are enabled is when calling the timer
343 * callback function.
344 */
7e920426 345 local_irq_save(flags);
1da177e4
LT		 346
347 /* Clear timer1 irq */
348 *R_IRQ_MASK0_CLR = IO_STATE(R_IRQ_MASK0_CLR, timer1, clr);
349
350 /* First stop timer, then ack interrupt */
351 /* Stop timer */
352 *R_TIMER_CTRL = r_timer_ctrl_shadow =
353 (r_timer_ctrl_shadow & ~IO_MASK(R_TIMER_CTRL, tm1)) |
354 IO_STATE(R_TIMER_CTRL, tm1, stop_ld);
355
356 /* Ack interrupt */
357 *R_TIMER_CTRL = r_timer_ctrl_shadow | IO_STATE(R_TIMER_CTRL, i1, clr);
358
359 fast_timer_running = 0;
360 fast_timer_ints++;
361
1da177e4
LT		 362 t = fast_timer_list;
363 while (t)
364 {
d8e5219f
JN		 365 struct fasttime_t tv;
366 fast_timer_function_type *f;
367 unsigned long d;
1da177e4
LT		 368
369 /* Has it really expired? */
370 do_gettimeofday_fast(&tv);
d8e5219f
JN		 371 D1(printk(KERN_DEBUG "t: %is %06ius\n",
372 tv.tv_jiff, tv.tv_usec));
1da177e4 373
2f1f53bd 374 if (fasttime_cmp(&t->tv_expires, &tv) <= 0)
1da177e4
LT		 375 {
376 /* Yes it has expired */
377#ifdef FAST_TIMER_LOG
378 timer_expired_log[fast_timers_expired % NUM_TIMER_STATS] = *t;
379#endif
380 fast_timers_expired++;
381
382 /* Remove this timer before call, since it may reuse the timer */
1da177e4
LT		 383 if (t->prev)
384 {
385 t->prev->next = t->next;
386 }
387 else
388 {
389 fast_timer_list = t->next;
390 }
391 if (t->next)
392 {
393 t->next->prev = t->prev;
394 }
395 t->prev = NULL;
396 t->next = NULL;
1da177e4 397
d8e5219f
JN		 398 /* Save function callback data before enabling
399 * interrupts, since the timer may be removed and
400 * we don't know how it was allocated
401 * (e.g. ->function and ->data may become overwritten
402 * after deletion if the timer was stack-allocated).
403 */
404 f = t->function;
405 d = t->data;
406
407 if (f != NULL) {
408 /* Run callback with interrupts enabled. */
409 local_irq_restore(flags);
410 f(d);
411 local_irq_save(flags);
412 } else
1da177e4 413 DEBUG_LOG("!timer1 %i function==NULL!\n", fast_timer_ints);
1da177e4
LT		 414 }
415 else
416 {
417 /* Timer is to early, let's set it again using the normal routines */
418 D1(printk(".\n"));
419 }
420
1da177e4
LT		 421 if ((t = fast_timer_list) != NULL)
422 {
423 /* Start next timer.. */
d8e5219f
JN		 424 long us = 0;
425 struct fasttime_t tv;
1da177e4
LT		 426
427 do_gettimeofday_fast(&tv);
d8e5219f
JN		 428
429 /* time_after_eq takes care of wrapping */
430 if (time_after_eq(t->tv_expires.tv_jiff, tv.tv_jiff))
431 us = ((t->tv_expires.tv_jiff - tv.tv_jiff) *
432 1000000 / HZ + t->tv_expires.tv_usec -
433 tv.tv_usec);
434
1da177e4
LT		 435 if (us > 0)
436 {
437 if (!fast_timer_running)
438 {
439#ifdef FAST_TIMER_LOG
440 timer_started_log[fast_timers_started % NUM_TIMER_STATS] = *t;
441#endif
442 start_timer1(us);
443 }
1da177e4
LT		 444 break;
445 }
446 else
447 {
448 /* Timer already expired, let's handle it better late than never.
449 * The normal loop handles it
450 */
451 D1(printk("e! %d\n", us));
452 }
453 }
1da177e4
LT		 454 }
455
d8e5219f
JN		 456 local_irq_restore(flags);
457
1da177e4
LT		 458 if (!t)
459 {
460 D1(printk("t1 stop!\n"));
461 }
462
463 return IRQ_HANDLED;
464}
465
466static void wake_up_func(unsigned long data)
467{
d77eab8c 468 wait_queue_head_t *sleep_wait_p = (wait_queue_head_t *)data;
1da177e4
LT		 469 wake_up(sleep_wait_p);
470}
471
472
473/* Useful API */
474
475void schedule_usleep(unsigned long us)
476{
477 struct fast_timer t;
1da177e4
LT		 478 wait_queue_head_t sleep_wait;
479 init_waitqueue_head(&sleep_wait);
1da177e4
LT		 480
481 D1(printk("schedule_usleep(%d)\n", us));
1da177e4
LT		 482 start_one_shot_timer(&t, wake_up_func, (unsigned long)&sleep_wait, us,
483 "usleep");
d8e5219f
JN		 484 /* Uninterruptible sleep on the fast timer. (The condition is somewhat
485 * redundant since the timer is what wakes us up.) */
486 wait_event(sleep_wait, !fast_timer_pending(&t));
487
1da177e4 488 D1(printk("done schedule_usleep(%d)\n", us));
1da177e4
LT		 489}
490
491#ifdef CONFIG_PROC_FS
492static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
493 ,int *eof, void *data_unused);
1da177e4
LT		 494#endif /* CONFIG_PROC_FS */
495
496#ifdef CONFIG_PROC_FS
497
498/* This value is very much based on testing */
499#define BIG_BUF_SIZE (500 + NUM_TIMER_STATS * 300)
500
501static int proc_fasttimer_read(char *buf, char **start, off_t offset, int len
502 ,int *eof, void *data_unused)
503{
504 unsigned long flags;
505 int i = 0;
506 int num_to_show;
d8e5219f 507 struct fasttime_t tv;
1da177e4
LT		 508 struct fast_timer *t, *nextt;
509 static char *bigbuf = NULL;
510 static unsigned long used;
511
512 if (!bigbuf && !(bigbuf = vmalloc(BIG_BUF_SIZE)))
513 {
514 used = 0;
d8e5219f
JN		 515 if (buf)
516 buf[0] = '\0';
1da177e4
LT		 517 return 0;
518 }
519
520 if (!offset || !used)
521 {
522 do_gettimeofday_fast(&tv);
523
524 used = 0;
525 used += sprintf(bigbuf + used, "Fast timers added: %i\n",
526 fast_timers_added);
527 used += sprintf(bigbuf + used, "Fast timers started: %i\n",
528 fast_timers_started);
529 used += sprintf(bigbuf + used, "Fast timer interrupts: %i\n",
530 fast_timer_ints);
531 used += sprintf(bigbuf + used, "Fast timers expired: %i\n",
532 fast_timers_expired);
533 used += sprintf(bigbuf + used, "Fast timers deleted: %i\n",
534 fast_timers_deleted);
535 used += sprintf(bigbuf + used, "Fast timer running: %s\n",
536 fast_timer_running ? "yes" : "no");
537 used += sprintf(bigbuf + used, "Current time: %lu.%06lu\n",
d8e5219f 538 (unsigned long)tv.tv_jiff,
1da177e4
LT		 539 (unsigned long)tv.tv_usec);
540#ifdef FAST_TIMER_SANITY_CHECKS
541 used += sprintf(bigbuf + used, "Sanity failed: %i\n",
542 sanity_failed);
543#endif
544 used += sprintf(bigbuf + used, "\n");
545
546#ifdef DEBUG_LOG_INCLUDED
547 {
548 int end_i = debug_log_cnt;
549 i = 0;
550
551 if (debug_log_cnt_wrapped)
552 {
553 i = debug_log_cnt;
554 }
555
556 while ((i != end_i || (debug_log_cnt_wrapped && !used)) &&
557 used+100 < BIG_BUF_SIZE)
558 {
559 used += sprintf(bigbuf + used, debug_log_string[i],
560 debug_log_value[i]);
561 i = (i+1) % DEBUG_LOG_MAX;
562 }
563 }
564 used += sprintf(bigbuf + used, "\n");
565#endif
566
567 num_to_show = (fast_timers_started < NUM_TIMER_STATS ? fast_timers_started:
568 NUM_TIMER_STATS);
569 used += sprintf(bigbuf + used, "Timers started: %i\n", fast_timers_started);
570 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE) ; i++)
571 {
572 int cur = (fast_timers_started - i - 1) % NUM_TIMER_STATS;
573
574#if 1 //ndef FAST_TIMER_LOG
575 used += sprintf(bigbuf + used, "div: %i freq: %i delay: %i"
576 "\n",
577 timer_div_settings[cur],
578 timer_freq_settings[cur],
579 timer_delay_settings[cur]
580 );
581#endif
582#ifdef FAST_TIMER_LOG
583 t = &timer_started_log[cur];
584 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
585 "d: %6li us data: 0x%08lX"
586 "\n",
587 t->name,
d8e5219f 588 (unsigned long)t->tv_set.tv_jiff,
1da177e4 589 (unsigned long)t->tv_set.tv_usec,
d8e5219f 590 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 591 (unsigned long)t->tv_expires.tv_usec,
592 t->delay_us,
593 t->data
594 );
595#endif
596 }
597 used += sprintf(bigbuf + used, "\n");
598
599#ifdef FAST_TIMER_LOG
600 num_to_show = (fast_timers_added < NUM_TIMER_STATS ? fast_timers_added:
601 NUM_TIMER_STATS);
602 used += sprintf(bigbuf + used, "Timers added: %i\n", fast_timers_added);
603 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
604 {
605 t = &timer_added_log[(fast_timers_added - i - 1) % NUM_TIMER_STATS];
606 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
607 "d: %6li us data: 0x%08lX"
608 "\n",
609 t->name,
d8e5219f 610 (unsigned long)t->tv_set.tv_jiff,
1da177e4 611 (unsigned long)t->tv_set.tv_usec,
d8e5219f 612 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 613 (unsigned long)t->tv_expires.tv_usec,
614 t->delay_us,
615 t->data
616 );
617 }
618 used += sprintf(bigbuf + used, "\n");
619
620 num_to_show = (fast_timers_expired < NUM_TIMER_STATS ? fast_timers_expired:
621 NUM_TIMER_STATS);
622 used += sprintf(bigbuf + used, "Timers expired: %i\n", fast_timers_expired);
623 for (i = 0; i < num_to_show && (used+100 < BIG_BUF_SIZE); i++)
624 {
625 t = &timer_expired_log[(fast_timers_expired - i - 1) % NUM_TIMER_STATS];
626 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
627 "d: %6li us data: 0x%08lX"
628 "\n",
629 t->name,
d8e5219f 630 (unsigned long)t->tv_set.tv_jiff,
1da177e4 631 (unsigned long)t->tv_set.tv_usec,
d8e5219f 632 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 633 (unsigned long)t->tv_expires.tv_usec,
634 t->delay_us,
635 t->data
636 );
637 }
638 used += sprintf(bigbuf + used, "\n");
639#endif
640
641 used += sprintf(bigbuf + used, "Active timers:\n");
7e920426 642 local_irq_save(flags);
1da177e4
LT		 643 t = fast_timer_list;
644 while (t != NULL && (used+100 < BIG_BUF_SIZE))
645 {
646 nextt = t->next;
7e920426 647 local_irq_restore(flags);
1da177e4
LT		 648 used += sprintf(bigbuf + used, "%-14s s: %6lu.%06lu e: %6lu.%06lu "
649 "d: %6li us data: 0x%08lX"
650/* " func: 0x%08lX" */
651 "\n",
652 t->name,
d8e5219f 653 (unsigned long)t->tv_set.tv_jiff,
1da177e4 654 (unsigned long)t->tv_set.tv_usec,
d8e5219f 655 (unsigned long)t->tv_expires.tv_jiff,
1da177e4
LT		 656 (unsigned long)t->tv_expires.tv_usec,
657 t->delay_us,
658 t->data
659/* , t->function */
660 );
d8e5219f 661 local_irq_save(flags);
1da177e4
LT		 662 if (t->next != nextt)
663 {
664 printk(KERN_WARNING "timer removed!\n");
665 }
666 t = nextt;
667 }
7e920426 668 local_irq_restore(flags);
1da177e4
LT		 669 }
670
671 if (used - offset < len)
672 {
673 len = used - offset;
674 }
675
676 memcpy(buf, bigbuf + offset, len);
677 *start = buf;
678 *eof = 1;
679
680 return len;
681}
682#endif /* PROC_FS */
683
684#ifdef FAST_TIMER_TEST
685static volatile unsigned long i = 0;
686static volatile int num_test_timeout = 0;
687static struct fast_timer tr[10];
688static int exp_num[10];
689
d8e5219f 690static struct fasttime_t tv_exp[100];
1da177e4
LT		 691
692static void test_timeout(unsigned long data)
693{
694 do_gettimeofday_fast(&tv_exp[data]);
695 exp_num[data] = num_test_timeout;
696
697 num_test_timeout++;
698}
699
700static void test_timeout1(unsigned long data)
701{
702 do_gettimeofday_fast(&tv_exp[data]);
703 exp_num[data] = num_test_timeout;
704 if (data < 7)
705 {
706 start_one_shot_timer(&tr[i], test_timeout1, i, 1000, "timeout1");
707 i++;
708 }
709 num_test_timeout++;
710}
711
712DP(
713static char buf0[2000];
714static char buf1[2000];
715static char buf2[2000];
716static char buf3[2000];
717static char buf4[2000];
718);
719
720static char buf5[6000];
721static int j_u[1000];
722
723static void fast_timer_test(void)
724{
725 int prev_num;
726 int j;
727
d8e5219f 728 struct fasttime_t tv, tv0, tv1, tv2;
1da177e4
LT		 729
730 printk("fast_timer_test() start\n");
731 do_gettimeofday_fast(&tv);
732
733 for (j = 0; j < 1000; j++)
734 {
735 j_u[j] = GET_JIFFIES_USEC();
736 }
737 for (j = 0; j < 100; j++)
738 {
739 do_gettimeofday_fast(&tv_exp[j]);
740 }
d8e5219f
JN		 741 printk(KERN_DEBUG "fast_timer_test() %is %06i\n",
742 tv.tv_jiff, tv.tv_usec);
1da177e4
LT		 743
744 for (j = 0; j < 1000; j++)
745 {
746 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]);
747 j += 4;
748 }
749 for (j = 0; j < 100; j++)
750 {
d8e5219f
JN		 751 printk(KERN_DEBUG "%i.%i %i.%i %i.%i %i.%i %i.%i\n",
752 tv_exp[j].tv_jiff, tv_exp[j].tv_usec,
753 tv_exp[j+1].tv_jiff, tv_exp[j+1].tv_usec,
754 tv_exp[j+2].tv_jiff, tv_exp[j+2].tv_usec,
755 tv_exp[j+3].tv_jiff, tv_exp[j+3].tv_usec,
756 tv_exp[j+4].tv_jiff, tv_exp[j+4].tv_usec);
1da177e4
LT		 757 j += 4;
758 }
759 do_gettimeofday_fast(&tv0);
760 start_one_shot_timer(&tr[i], test_timeout, i, 50000, "test0");
761 DP(proc_fasttimer_read(buf0, NULL, 0, 0, 0));
762 i++;
763 start_one_shot_timer(&tr[i], test_timeout, i, 70000, "test1");
764 DP(proc_fasttimer_read(buf1, NULL, 0, 0, 0));
765 i++;
766 start_one_shot_timer(&tr[i], test_timeout, i, 40000, "test2");
767 DP(proc_fasttimer_read(buf2, NULL, 0, 0, 0));
768 i++;
769 start_one_shot_timer(&tr[i], test_timeout, i, 60000, "test3");
770 DP(proc_fasttimer_read(buf3, NULL, 0, 0, 0));
771 i++;
772 start_one_shot_timer(&tr[i], test_timeout1, i, 55000, "test4xx");
773 DP(proc_fasttimer_read(buf4, NULL, 0, 0, 0));
774 i++;
775 do_gettimeofday_fast(&tv1);
776
777 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
778
779 prev_num = num_test_timeout;
780 while (num_test_timeout < i)
781 {
782 if (num_test_timeout != prev_num)
783 {
784 prev_num = num_test_timeout;
785 }
786 }
787 do_gettimeofday_fast(&tv2);
d8e5219f
JN		 788 printk(KERN_DEBUG "Timers started %is %06i\n",
789 tv0.tv_jiff, tv0.tv_usec);
790 printk(KERN_DEBUG "Timers started at %is %06i\n",
791 tv1.tv_jiff, tv1.tv_usec);
792 printk(KERN_DEBUG "Timers done %is %06i\n",
793 tv2.tv_jiff, tv2.tv_usec);
1da177e4
LT		 794 DP(printk("buf0:\n");
795 printk(buf0);
796 printk("buf1:\n");
797 printk(buf1);
798 printk("buf2:\n");
799 printk(buf2);
800 printk("buf3:\n");
801 printk(buf3);
802 printk("buf4:\n");
803 printk(buf4);
804 );
805 printk("buf5:\n");
806 printk(buf5);
807
808 printk("timers set:\n");
809 for(j = 0; j<i; j++)
810 {
811 struct fast_timer *t = &tr[j];
812 printk("%-10s set: %6is %06ius exp: %6is %06ius "
813 "data: 0x%08X func: 0x%08X\n",
814 t->name,
d8e5219f 815 t->tv_set.tv_jiff,
1da177e4 816 t->tv_set.tv_usec,
d8e5219f 817 t->tv_expires.tv_jiff,
1da177e4
LT		 818 t->tv_expires.tv_usec,
819 t->data,
820 t->function
821 );
822
823 printk(" del: %6ius did exp: %6is %06ius as #%i error: %6li\n",
824 t->delay_us,
d8e5219f 825 tv_exp[j].tv_jiff,
1da177e4
LT		 826 tv_exp[j].tv_usec,
827 exp_num[j],
d8e5219f
JN		 828 (tv_exp[j].tv_jiff - t->tv_expires.tv_jiff) *
829 1000000 + tv_exp[j].tv_usec -
830 t->tv_expires.tv_usec);
1da177e4
LT		 831 }
832 proc_fasttimer_read(buf5, NULL, 0, 0, 0);
833 printk("buf5 after all done:\n");
834 printk(buf5);
835 printk("fast_timer_test() done\n");
836}
837#endif
838
839
d8e5219f 840int fast_timer_init(void)
1da177e4
LT		 841{
842 /* For some reason, request_irq() hangs when called froom time_init() */
843 if (!fast_timer_is_init)
844 {
845#if 0 && defined(FAST_TIMER_TEST)
846 int i;
847#endif
848
849 printk(KERN_INFO "fast_timer_init()\n");
850
851#if 0 && defined(FAST_TIMER_TEST)
852 for (i = 0; i <= TIMER0_DIV; i++)
853 {
854 /* We must be careful not to get overflow... */
855 printk("%3i %6u\n", i, timer0_value_us[i]);
856 }
857#endif
858#ifdef CONFIG_PROC_FS
e784788d 859 create_proc_read_entry("fasttimer", 0, NULL, proc_fasttimer_read, NULL);
1da177e4 860#endif /* PROC_FS */
7e920426 861 if(request_irq(TIMER1_IRQ_NBR, timer1_handler, 0,
1da177e4
LT		 862 "fast timer int", NULL))
863 {
864 printk("err: timer1 irq\n");
865 }
866 fast_timer_is_init = 1;
867#ifdef FAST_TIMER_TEST
868 printk("do test\n");
869 fast_timer_test();
870#endif
871 }
d8e5219f 872 return 0;
1da177e4 873}
d8e5219f 874__initcall(fast_timer_init);
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