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Takashi Iwaib7bbf872009-06-05 16:11:07 +02001/*
2 * PCM timer handling on ctxfi
3 *
4 * This source file is released under GPL v2 license (no other versions).
5 * See the COPYING file included in the main directory of this source
6 * distribution for the license terms and conditions.
7 */
8
9#include <linux/slab.h>
Takashi Iwai28cd4aa2009-06-05 17:58:00 +020010#include <linux/math64.h>
Takashi Iwai04145f22009-06-08 21:31:50 +020011#include <linux/moduleparam.h>
Takashi Iwaib7bbf872009-06-05 16:11:07 +020012#include <sound/core.h>
13#include <sound/pcm.h>
14#include "ctatc.h"
15#include "cthardware.h"
16#include "cttimer.h"
17
Rusty Russella67ff6a2011-12-15 13:49:36 +103018static bool use_system_timer;
19MODULE_PARM_DESC(use_system_timer, "Force to use system-timer");
Takashi Iwai04145f22009-06-08 21:31:50 +020020module_param(use_system_timer, bool, S_IRUGO);
21
Takashi Iwaib7bbf872009-06-05 16:11:07 +020022struct ct_timer_ops {
23 void (*init)(struct ct_timer_instance *);
24 void (*prepare)(struct ct_timer_instance *);
25 void (*start)(struct ct_timer_instance *);
26 void (*stop)(struct ct_timer_instance *);
27 void (*free_instance)(struct ct_timer_instance *);
28 void (*interrupt)(struct ct_timer *);
29 void (*free_global)(struct ct_timer *);
30};
31
32/* timer instance -- assigned to each PCM stream */
33struct ct_timer_instance {
34 spinlock_t lock;
35 struct ct_timer *timer_base;
36 struct ct_atc_pcm *apcm;
37 struct snd_pcm_substream *substream;
38 struct timer_list timer;
39 struct list_head instance_list;
40 struct list_head running_list;
41 unsigned int position;
42 unsigned int frag_count;
43 unsigned int running:1;
44 unsigned int need_update:1;
45};
46
47/* timer instance manager */
48struct ct_timer {
49 spinlock_t lock; /* global timer lock (for xfitimer) */
50 spinlock_t list_lock; /* lock for instance list */
51 struct ct_atc *atc;
52 struct ct_timer_ops *ops;
53 struct list_head instance_head;
54 struct list_head running_head;
Takashi Iwai54de6bc2009-06-08 10:21:07 +020055 unsigned int wc; /* current wallclock */
Takashi Iwaib7bbf872009-06-05 16:11:07 +020056 unsigned int irq_handling:1; /* in IRQ handling */
57 unsigned int reprogram:1; /* need to reprogram the internval */
58 unsigned int running:1; /* global timer running */
59};
60
61
62/*
63 * system-timer-based updates
64 */
65
66static void ct_systimer_callback(unsigned long data)
67{
68 struct ct_timer_instance *ti = (struct ct_timer_instance *)data;
69 struct snd_pcm_substream *substream = ti->substream;
70 struct snd_pcm_runtime *runtime = substream->runtime;
71 struct ct_atc_pcm *apcm = ti->apcm;
72 unsigned int period_size = runtime->period_size;
73 unsigned int buffer_size = runtime->buffer_size;
74 unsigned long flags;
75 unsigned int position, dist, interval;
76
77 position = substream->ops->pointer(substream);
78 dist = (position + buffer_size - ti->position) % buffer_size;
79 if (dist >= period_size ||
80 position / period_size != ti->position / period_size) {
81 apcm->interrupt(apcm);
82 ti->position = position;
83 }
84 /* Add extra HZ*5/1000 to avoid overrun issue when recording
85 * at 8kHz in 8-bit format or at 88kHz in 24-bit format. */
86 interval = ((period_size - (position % period_size))
87 * HZ + (runtime->rate - 1)) / runtime->rate + HZ * 5 / 1000;
88 spin_lock_irqsave(&ti->lock, flags);
89 if (ti->running)
90 mod_timer(&ti->timer, jiffies + interval);
91 spin_unlock_irqrestore(&ti->lock, flags);
92}
93
94static void ct_systimer_init(struct ct_timer_instance *ti)
95{
96 setup_timer(&ti->timer, ct_systimer_callback,
97 (unsigned long)ti);
98}
99
100static void ct_systimer_start(struct ct_timer_instance *ti)
101{
102 struct snd_pcm_runtime *runtime = ti->substream->runtime;
103 unsigned long flags;
104
105 spin_lock_irqsave(&ti->lock, flags);
106 ti->running = 1;
107 mod_timer(&ti->timer,
108 jiffies + (runtime->period_size * HZ +
109 (runtime->rate - 1)) / runtime->rate);
110 spin_unlock_irqrestore(&ti->lock, flags);
111}
112
113static void ct_systimer_stop(struct ct_timer_instance *ti)
114{
115 unsigned long flags;
116
117 spin_lock_irqsave(&ti->lock, flags);
118 ti->running = 0;
119 del_timer(&ti->timer);
120 spin_unlock_irqrestore(&ti->lock, flags);
121}
122
123static void ct_systimer_prepare(struct ct_timer_instance *ti)
124{
125 ct_systimer_stop(ti);
126 try_to_del_timer_sync(&ti->timer);
127}
128
129#define ct_systimer_free ct_systimer_prepare
130
131static struct ct_timer_ops ct_systimer_ops = {
132 .init = ct_systimer_init,
133 .free_instance = ct_systimer_free,
134 .prepare = ct_systimer_prepare,
135 .start = ct_systimer_start,
136 .stop = ct_systimer_stop,
137};
138
139
140/*
141 * Handling multiple streams using a global emu20k1 timer irq
142 */
143
144#define CT_TIMER_FREQ 48000
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200145#define MIN_TICKS 1
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200146#define MAX_TICKS ((1 << 13) - 1)
147
148static void ct_xfitimer_irq_rearm(struct ct_timer *atimer, int ticks)
149{
150 struct hw *hw = atimer->atc->hw;
151 if (ticks > MAX_TICKS)
152 ticks = MAX_TICKS;
153 hw->set_timer_tick(hw, ticks);
154 if (!atimer->running)
155 hw->set_timer_irq(hw, 1);
156 atimer->running = 1;
157}
158
159static void ct_xfitimer_irq_stop(struct ct_timer *atimer)
160{
161 if (atimer->running) {
162 struct hw *hw = atimer->atc->hw;
163 hw->set_timer_irq(hw, 0);
164 hw->set_timer_tick(hw, 0);
165 atimer->running = 0;
166 }
167}
168
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200169static inline unsigned int ct_xfitimer_get_wc(struct ct_timer *atimer)
170{
171 struct hw *hw = atimer->atc->hw;
172 return hw->get_wc(hw);
173}
174
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200175/*
176 * reprogram the timer interval;
177 * checks the running instance list and determines the next timer interval.
178 * also updates the each stream position, returns the number of streams
179 * to call snd_pcm_period_elapsed() appropriately
180 *
181 * call this inside the lock and irq disabled
182 */
Takashi Iwai8dca4192009-06-15 14:50:52 +0200183static int ct_xfitimer_reprogram(struct ct_timer *atimer, int can_update)
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200184{
185 struct ct_timer_instance *ti;
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200186 unsigned int min_intr = (unsigned int)-1;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200187 int updates = 0;
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200188 unsigned int wc, diff;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200189
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200190 if (list_empty(&atimer->running_head)) {
191 ct_xfitimer_irq_stop(atimer);
192 atimer->reprogram = 0; /* clear flag */
193 return 0;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200194 }
195
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200196 wc = ct_xfitimer_get_wc(atimer);
197 diff = wc - atimer->wc;
198 atimer->wc = wc;
199 list_for_each_entry(ti, &atimer->running_head, running_list) {
200 if (ti->frag_count > diff)
201 ti->frag_count -= diff;
202 else {
203 unsigned int pos;
204 unsigned int period_size, rate;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200205
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200206 period_size = ti->substream->runtime->period_size;
207 rate = ti->substream->runtime->rate;
208 pos = ti->substream->ops->pointer(ti->substream);
209 if (pos / period_size != ti->position / period_size) {
210 ti->need_update = 1;
211 ti->position = pos;
212 updates++;
213 }
214 pos %= period_size;
215 pos = period_size - pos;
216 ti->frag_count = div_u64((u64)pos * CT_TIMER_FREQ +
217 rate - 1, rate);
218 }
Takashi Iwai8dca4192009-06-15 14:50:52 +0200219 if (ti->need_update && !can_update)
220 min_intr = 0; /* pending to the next irq */
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200221 if (ti->frag_count < min_intr)
222 min_intr = ti->frag_count;
223 }
224
225 if (min_intr < MIN_TICKS)
226 min_intr = MIN_TICKS;
227 ct_xfitimer_irq_rearm(atimer, min_intr);
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200228 atimer->reprogram = 0; /* clear flag */
229 return updates;
230}
231
232/* look through the instance list and call period_elapsed if needed */
233static void ct_xfitimer_check_period(struct ct_timer *atimer)
234{
235 struct ct_timer_instance *ti;
236 unsigned long flags;
237
238 spin_lock_irqsave(&atimer->list_lock, flags);
239 list_for_each_entry(ti, &atimer->instance_head, instance_list) {
Takashi Iwai8dca4192009-06-15 14:50:52 +0200240 if (ti->running && ti->need_update) {
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200241 ti->need_update = 0;
242 ti->apcm->interrupt(ti->apcm);
243 }
244 }
245 spin_unlock_irqrestore(&atimer->list_lock, flags);
246}
247
248/* Handle timer-interrupt */
249static void ct_xfitimer_callback(struct ct_timer *atimer)
250{
251 int update;
252 unsigned long flags;
253
254 spin_lock_irqsave(&atimer->lock, flags);
255 atimer->irq_handling = 1;
256 do {
Takashi Iwai8dca4192009-06-15 14:50:52 +0200257 update = ct_xfitimer_reprogram(atimer, 1);
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200258 spin_unlock(&atimer->lock);
259 if (update)
260 ct_xfitimer_check_period(atimer);
261 spin_lock(&atimer->lock);
262 } while (atimer->reprogram);
263 atimer->irq_handling = 0;
264 spin_unlock_irqrestore(&atimer->lock, flags);
265}
266
267static void ct_xfitimer_prepare(struct ct_timer_instance *ti)
268{
269 ti->frag_count = ti->substream->runtime->period_size;
Takashi Iwai8dca4192009-06-15 14:50:52 +0200270 ti->running = 0;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200271 ti->need_update = 0;
272}
273
274
275/* start/stop the timer */
276static void ct_xfitimer_update(struct ct_timer *atimer)
277{
278 unsigned long flags;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200279
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200280 spin_lock_irqsave(&atimer->lock, flags);
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200281 if (atimer->irq_handling) {
282 /* reached from IRQ handler; let it handle later */
283 atimer->reprogram = 1;
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200284 spin_unlock_irqrestore(&atimer->lock, flags);
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200285 return;
286 }
287
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200288 ct_xfitimer_irq_stop(atimer);
Takashi Iwai8dca4192009-06-15 14:50:52 +0200289 ct_xfitimer_reprogram(atimer, 0);
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200290 spin_unlock_irqrestore(&atimer->lock, flags);
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200291}
292
293static void ct_xfitimer_start(struct ct_timer_instance *ti)
294{
295 struct ct_timer *atimer = ti->timer_base;
296 unsigned long flags;
297
298 spin_lock_irqsave(&atimer->lock, flags);
Takashi Iwai54de6bc2009-06-08 10:21:07 +0200299 if (list_empty(&ti->running_list))
300 atimer->wc = ct_xfitimer_get_wc(atimer);
Takashi Iwai8dca4192009-06-15 14:50:52 +0200301 ti->running = 1;
302 ti->need_update = 0;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200303 list_add(&ti->running_list, &atimer->running_head);
304 spin_unlock_irqrestore(&atimer->lock, flags);
305 ct_xfitimer_update(atimer);
306}
307
308static void ct_xfitimer_stop(struct ct_timer_instance *ti)
309{
310 struct ct_timer *atimer = ti->timer_base;
311 unsigned long flags;
312
313 spin_lock_irqsave(&atimer->lock, flags);
314 list_del_init(&ti->running_list);
Takashi Iwai8dca4192009-06-15 14:50:52 +0200315 ti->running = 0;
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200316 spin_unlock_irqrestore(&atimer->lock, flags);
317 ct_xfitimer_update(atimer);
318}
319
320static void ct_xfitimer_free_global(struct ct_timer *atimer)
321{
322 ct_xfitimer_irq_stop(atimer);
323}
324
325static struct ct_timer_ops ct_xfitimer_ops = {
326 .prepare = ct_xfitimer_prepare,
327 .start = ct_xfitimer_start,
328 .stop = ct_xfitimer_stop,
329 .interrupt = ct_xfitimer_callback,
330 .free_global = ct_xfitimer_free_global,
331};
332
333/*
334 * timer instance
335 */
336
337struct ct_timer_instance *
338ct_timer_instance_new(struct ct_timer *atimer, struct ct_atc_pcm *apcm)
339{
340 struct ct_timer_instance *ti;
341
342 ti = kzalloc(sizeof(*ti), GFP_KERNEL);
343 if (!ti)
344 return NULL;
345 spin_lock_init(&ti->lock);
346 INIT_LIST_HEAD(&ti->instance_list);
347 INIT_LIST_HEAD(&ti->running_list);
348 ti->timer_base = atimer;
349 ti->apcm = apcm;
350 ti->substream = apcm->substream;
351 if (atimer->ops->init)
352 atimer->ops->init(ti);
353
354 spin_lock_irq(&atimer->list_lock);
355 list_add(&ti->instance_list, &atimer->instance_head);
356 spin_unlock_irq(&atimer->list_lock);
357
358 return ti;
359}
360
361void ct_timer_prepare(struct ct_timer_instance *ti)
362{
363 if (ti->timer_base->ops->prepare)
364 ti->timer_base->ops->prepare(ti);
365 ti->position = 0;
366 ti->running = 0;
367}
368
369void ct_timer_start(struct ct_timer_instance *ti)
370{
371 struct ct_timer *atimer = ti->timer_base;
372 atimer->ops->start(ti);
373}
374
375void ct_timer_stop(struct ct_timer_instance *ti)
376{
377 struct ct_timer *atimer = ti->timer_base;
378 atimer->ops->stop(ti);
379}
380
381void ct_timer_instance_free(struct ct_timer_instance *ti)
382{
383 struct ct_timer *atimer = ti->timer_base;
384
385 atimer->ops->stop(ti); /* to be sure */
386 if (atimer->ops->free_instance)
387 atimer->ops->free_instance(ti);
388
389 spin_lock_irq(&atimer->list_lock);
390 list_del(&ti->instance_list);
391 spin_unlock_irq(&atimer->list_lock);
392
393 kfree(ti);
394}
395
396/*
397 * timer manager
398 */
399
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200400static void ct_timer_interrupt(void *data, unsigned int status)
401{
402 struct ct_timer *timer = data;
403
404 /* Interval timer interrupt */
405 if ((status & IT_INT) && timer->ops->interrupt)
406 timer->ops->interrupt(timer);
407}
408
409struct ct_timer *ct_timer_new(struct ct_atc *atc)
410{
411 struct ct_timer *atimer;
412 struct hw *hw;
413
414 atimer = kzalloc(sizeof(*atimer), GFP_KERNEL);
415 if (!atimer)
416 return NULL;
417 spin_lock_init(&atimer->lock);
418 spin_lock_init(&atimer->list_lock);
419 INIT_LIST_HEAD(&atimer->instance_head);
420 INIT_LIST_HEAD(&atimer->running_head);
421 atimer->atc = atc;
422 hw = atc->hw;
Takashi Iwai04145f22009-06-08 21:31:50 +0200423 if (!use_system_timer && hw->set_timer_irq) {
Takashi Iwai2e6705c2014-10-28 17:16:51 +0100424 dev_info(atc->card->dev, "Use xfi-native timer\n");
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200425 atimer->ops = &ct_xfitimer_ops;
426 hw->irq_callback_data = atimer;
427 hw->irq_callback = ct_timer_interrupt;
428 } else {
Takashi Iwai2e6705c2014-10-28 17:16:51 +0100429 dev_info(atc->card->dev, "Use system timer\n");
Takashi Iwaib7bbf872009-06-05 16:11:07 +0200430 atimer->ops = &ct_systimer_ops;
431 }
432 return atimer;
433}
434
435void ct_timer_free(struct ct_timer *atimer)
436{
437 struct hw *hw = atimer->atc->hw;
438 hw->irq_callback = NULL;
439 if (atimer->ops->free_global)
440 atimer->ops->free_global(atimer);
441 kfree(atimer);
442}
443