1 // SPDX-License-Identifier: GPL-2.0+
2 // Copyright 2017-2021 NXP
3
4 #include <linux/dma-mapping.h>
5 #include <linux/slab.h>
6 #include <linux/module.h>
7 #include <linux/delay.h>
8 #include <linux/rpmsg.h>
9 #include <sound/core.h>
10 #include <sound/pcm.h>
11 #include <sound/pcm_params.h>
12 #include <sound/dmaengine_pcm.h>
13 #include <sound/soc.h>
14
15 #include "imx-pcm.h"
16 #include "fsl_rpmsg.h"
17 #include "imx-pcm-rpmsg.h"
18
19 static const struct snd_pcm_hardware imx_rpmsg_pcm_hardware = {
20 .info = SNDRV_PCM_INFO_INTERLEAVED |
21 SNDRV_PCM_INFO_BLOCK_TRANSFER |
22 SNDRV_PCM_INFO_BATCH |
23 SNDRV_PCM_INFO_MMAP |
24 SNDRV_PCM_INFO_MMAP_VALID |
25 SNDRV_PCM_INFO_NO_PERIOD_WAKEUP |
26 SNDRV_PCM_INFO_PAUSE |
27 SNDRV_PCM_INFO_RESUME,
28 .buffer_bytes_max = IMX_DEFAULT_DMABUF_SIZE,
29 .period_bytes_min = 512,
30 .period_bytes_max = 65536,
31 .periods_min = 2,
32 .periods_max = 6000,
33 .fifo_size = 0,
34 };
35
36 static int imx_rpmsg_pcm_send_message(struct rpmsg_msg *msg,
37 struct rpmsg_info *info)
38 {
39 struct rpmsg_device *rpdev = info->rpdev;
40 int ret = 0;
41
42 mutex_lock(&info->msg_lock);
43 if (!rpdev) {
44 dev_err(info->dev, "rpmsg channel not ready\n");
45 mutex_unlock(&info->msg_lock);
46 return -EINVAL;
47 }
48
49 dev_dbg(&rpdev->dev, "send cmd %d\n", msg->s_msg.header.cmd);
50
51 if (!(msg->s_msg.header.type == MSG_TYPE_C))
52 reinit_completion(&info->cmd_complete);
53
54 ret = rpmsg_send(rpdev->ept, (void *)&msg->s_msg,
55 sizeof(struct rpmsg_s_msg));
56 if (ret) {
57 dev_err(&rpdev->dev, "rpmsg_send failed: %d\n", ret);
58 mutex_unlock(&info->msg_lock);
59 return ret;
60 }
61
62 /* No receive msg for TYPE_C command */
63 if (msg->s_msg.header.type == MSG_TYPE_C) {
64 mutex_unlock(&info->msg_lock);
65 return 0;
66 }
67
68 /* wait response from rpmsg */
69 ret = wait_for_completion_timeout(&info->cmd_complete,
70 msecs_to_jiffies(RPMSG_TIMEOUT));
71 if (!ret) {
72 dev_err(&rpdev->dev, "rpmsg_send cmd %d timeout!\n",
73 msg->s_msg.header.cmd);
74 mutex_unlock(&info->msg_lock);
75 return -ETIMEDOUT;
76 }
77
78 memcpy(&msg->r_msg, &info->r_msg, sizeof(struct rpmsg_r_msg));
79 memcpy(&info->msg[msg->r_msg.header.cmd].r_msg,
80 &msg->r_msg, sizeof(struct rpmsg_r_msg));
81
82 /*
83 * Reset the buffer pointer to be zero, actully we have
84 * set the buffer pointer to be zero in imx_rpmsg_terminate_all
85 * But if there is timer task queued in queue, after it is
86 * executed the buffer pointer will be changed, so need to
87 * reset it again with TERMINATE command.
88 */
89 switch (msg->s_msg.header.cmd) {
90 case TX_TERMINATE:
91 info->msg[TX_POINTER].r_msg.param.buffer_offset = 0;
92 break;
93 case RX_TERMINATE:
94 info->msg[RX_POINTER].r_msg.param.buffer_offset = 0;
95 break;
96 default:
97 break;
98 }
99
100 dev_dbg(&rpdev->dev, "cmd:%d, resp %d\n", msg->s_msg.header.cmd,
101 info->r_msg.param.resp);
102
103 mutex_unlock(&info->msg_lock);
104
105 return 0;
106 }
107
108 static int imx_rpmsg_insert_workqueue(struct snd_pcm_substream *substream,
109 struct rpmsg_msg *msg,
110 struct rpmsg_info *info)
111 {
112 unsigned long flags;
113 int ret = 0;
114
115 /*
116 * Queue the work to workqueue.
117 * If the queue is full, drop the message.
118 */
119 spin_lock_irqsave(&info->wq_lock, flags);
120 if (info->work_write_index != info->work_read_index) {
121 int index = info->work_write_index;
122
123 memcpy(&info->work_list[index].msg, msg,
124 sizeof(struct rpmsg_s_msg));
125
126 queue_work(info->rpmsg_wq, &info->work_list[index].work);
127 info->work_write_index++;
128 info->work_write_index %= WORK_MAX_NUM;
129 } else {
130 info->msg_drop_count[substream->stream]++;
131 ret = -EPIPE;
132 }
133 spin_unlock_irqrestore(&info->wq_lock, flags);
134
135 return ret;
136 }
137
138 static int imx_rpmsg_pcm_hw_params(struct snd_soc_component *component,
139 struct snd_pcm_substream *substream,
140 struct snd_pcm_hw_params *params)
141 {
142 struct rpmsg_info *info = dev_get_drvdata(component->dev);
143 struct rpmsg_msg *msg;
144
145 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
146 msg = &info->msg[TX_HW_PARAM];
147 msg->s_msg.header.cmd = TX_HW_PARAM;
148 } else {
149 msg = &info->msg[RX_HW_PARAM];
150 msg->s_msg.header.cmd = RX_HW_PARAM;
151 }
152
153 msg->s_msg.param.rate = params_rate(params);
154
155 switch (params_format(params)) {
156 case SNDRV_PCM_FORMAT_S16_LE:
157 msg->s_msg.param.format = RPMSG_S16_LE;
158 break;
159 case SNDRV_PCM_FORMAT_S24_LE:
160 msg->s_msg.param.format = RPMSG_S24_LE;
161 break;
162 case SNDRV_PCM_FORMAT_DSD_U16_LE:
163 msg->s_msg.param.format = RPMSG_DSD_U16_LE;
164 break;
165 case SNDRV_PCM_FORMAT_DSD_U32_LE:
166 msg->s_msg.param.format = RPMSG_DSD_U32_LE;
167 break;
168 default:
169 msg->s_msg.param.format = RPMSG_S32_LE;
170 break;
171 }
172
173 switch (params_channels(params)) {
174 case 1:
175 msg->s_msg.param.channels = RPMSG_CH_LEFT;
176 break;
177 case 2:
178 msg->s_msg.param.channels = RPMSG_CH_STEREO;
179 break;
180 default:
181 msg->s_msg.param.channels = params_channels(params);
182 break;
183 }
184
185 info->send_message(msg, info);
186
187 return 0;
188 }
189
190 static snd_pcm_uframes_t imx_rpmsg_pcm_pointer(struct snd_soc_component *component,
191 struct snd_pcm_substream *substream)
192 {
193 struct rpmsg_info *info = dev_get_drvdata(component->dev);
194 struct rpmsg_msg *msg;
195 unsigned int pos = 0;
196 int buffer_tail = 0;
197
198 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
199 msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
200 else
201 msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
202
203 buffer_tail = msg->r_msg.param.buffer_tail;
204 pos = buffer_tail * snd_pcm_lib_period_bytes(substream);
205
206 return bytes_to_frames(substream->runtime, pos);
207 }
208
209 static void imx_rpmsg_timer_callback(struct timer_list *t)
210 {
211 struct stream_timer *stream_timer =
212 from_timer(stream_timer, t, timer);
213 struct snd_pcm_substream *substream = stream_timer->substream;
214 struct rpmsg_info *info = stream_timer->info;
215 struct rpmsg_msg *msg;
216
217 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
218 msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
219 msg->s_msg.header.cmd = TX_PERIOD_DONE;
220 } else {
221 msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
222 msg->s_msg.header.cmd = RX_PERIOD_DONE;
223 }
224
225 imx_rpmsg_insert_workqueue(substream, msg, info);
226 }
227
228 static int imx_rpmsg_pcm_open(struct snd_soc_component *component,
229 struct snd_pcm_substream *substream)
230 {
231 struct rpmsg_info *info = dev_get_drvdata(component->dev);
232 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
233 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
234 struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
235 struct snd_pcm_hardware pcm_hardware;
236 struct rpmsg_msg *msg;
237 int ret = 0;
238 int cmd;
239
240 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
241 msg = &info->msg[TX_OPEN];
242 msg->s_msg.header.cmd = TX_OPEN;
243
244 /* reinitialize buffer counter*/
245 cmd = TX_PERIOD_DONE + MSG_TYPE_A_NUM;
246 info->msg[cmd].s_msg.param.buffer_tail = 0;
247 info->msg[cmd].r_msg.param.buffer_tail = 0;
248 info->msg[TX_POINTER].r_msg.param.buffer_offset = 0;
249
250 } else {
251 msg = &info->msg[RX_OPEN];
252 msg->s_msg.header.cmd = RX_OPEN;
253
254 /* reinitialize buffer counter*/
255 cmd = RX_PERIOD_DONE + MSG_TYPE_A_NUM;
256 info->msg[cmd].s_msg.param.buffer_tail = 0;
257 info->msg[cmd].r_msg.param.buffer_tail = 0;
258 info->msg[RX_POINTER].r_msg.param.buffer_offset = 0;
259 }
260
261 info->send_message(msg, info);
262
263 pcm_hardware = imx_rpmsg_pcm_hardware;
264 pcm_hardware.buffer_bytes_max = rpmsg->buffer_size;
265 pcm_hardware.period_bytes_max = pcm_hardware.buffer_bytes_max / 2;
266
267 snd_soc_set_runtime_hwparams(substream, &pcm_hardware);
268
269 ret = snd_pcm_hw_constraint_integer(substream->runtime,
270 SNDRV_PCM_HW_PARAM_PERIODS);
271 if (ret < 0)
272 return ret;
273
274 info->msg_drop_count[substream->stream] = 0;
275
276 /* Create timer*/
277 info->stream_timer[substream->stream].info = info;
278 info->stream_timer[substream->stream].substream = substream;
279 timer_setup(&info->stream_timer[substream->stream].timer,
280 imx_rpmsg_timer_callback, 0);
281 return ret;
282 }
283
284 static int imx_rpmsg_pcm_close(struct snd_soc_component *component,
285 struct snd_pcm_substream *substream)
286 {
287 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
288 struct rpmsg_info *info = dev_get_drvdata(component->dev);
289 struct rpmsg_msg *msg;
290
291 /* Flush work in workqueue to make TX_CLOSE is the last message */
292 flush_workqueue(info->rpmsg_wq);
293
294 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
295 msg = &info->msg[TX_CLOSE];
296 msg->s_msg.header.cmd = TX_CLOSE;
297 } else {
298 msg = &info->msg[RX_CLOSE];
299 msg->s_msg.header.cmd = RX_CLOSE;
300 }
301
302 info->send_message(msg, info);
303
304 del_timer(&info->stream_timer[substream->stream].timer);
305
306 rtd->dai_link->ignore_suspend = 0;
307
308 if (info->msg_drop_count[substream->stream])
309 dev_warn(rtd->dev, "Msg is dropped!, number is %d\n",
310 info->msg_drop_count[substream->stream]);
311
312 return 0;
313 }
314
315 static int imx_rpmsg_pcm_prepare(struct snd_soc_component *component,
316 struct snd_pcm_substream *substream)
317 {
318 struct snd_pcm_runtime *runtime = substream->runtime;
319 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
320 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
321 struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
322
323 /*
324 * NON-MMAP mode, NONBLOCK, Version 2, enable lpa in dts
325 * four conditions to determine the lpa is enabled.
326 */
327 if ((runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
328 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) &&
329 rpmsg->enable_lpa) {
330 /*
331 * Ignore suspend operation in low power mode
332 * M core will continue playback music on A core suspend.
333 */
334 rtd->dai_link->ignore_suspend = 1;
335 rpmsg->force_lpa = 1;
336 } else {
337 rpmsg->force_lpa = 0;
338 }
339
340 return 0;
341 }
342
343 static void imx_rpmsg_pcm_dma_complete(void *arg)
344 {
345 struct snd_pcm_substream *substream = arg;
346
347 snd_pcm_period_elapsed(substream);
348 }
349
350 static int imx_rpmsg_prepare_and_submit(struct snd_soc_component *component,
351 struct snd_pcm_substream *substream)
352 {
353 struct rpmsg_info *info = dev_get_drvdata(component->dev);
354 struct rpmsg_msg *msg;
355
356 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
357 msg = &info->msg[TX_BUFFER];
358 msg->s_msg.header.cmd = TX_BUFFER;
359 } else {
360 msg = &info->msg[RX_BUFFER];
361 msg->s_msg.header.cmd = RX_BUFFER;
362 }
363
364 /* Send buffer address and buffer size */
365 msg->s_msg.param.buffer_addr = substream->runtime->dma_addr;
366 msg->s_msg.param.buffer_size = snd_pcm_lib_buffer_bytes(substream);
367 msg->s_msg.param.period_size = snd_pcm_lib_period_bytes(substream);
368 msg->s_msg.param.buffer_tail = 0;
369
370 info->num_period[substream->stream] = msg->s_msg.param.buffer_size /
371 msg->s_msg.param.period_size;
372
373 info->callback[substream->stream] = imx_rpmsg_pcm_dma_complete;
374 info->callback_param[substream->stream] = substream;
375
376 return imx_rpmsg_insert_workqueue(substream, msg, info);
377 }
378
379 static int imx_rpmsg_async_issue_pending(struct snd_soc_component *component,
380 struct snd_pcm_substream *substream)
381 {
382 struct rpmsg_info *info = dev_get_drvdata(component->dev);
383 struct rpmsg_msg *msg;
384
385 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
386 msg = &info->msg[TX_START];
387 msg->s_msg.header.cmd = TX_START;
388 } else {
389 msg = &info->msg[RX_START];
390 msg->s_msg.header.cmd = RX_START;
391 }
392
393 return imx_rpmsg_insert_workqueue(substream, msg, info);
394 }
395
396 static int imx_rpmsg_restart(struct snd_soc_component *component,
397 struct snd_pcm_substream *substream)
398 {
399 struct rpmsg_info *info = dev_get_drvdata(component->dev);
400 struct rpmsg_msg *msg;
401
402 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
403 msg = &info->msg[TX_RESTART];
404 msg->s_msg.header.cmd = TX_RESTART;
405 } else {
406 msg = &info->msg[RX_RESTART];
407 msg->s_msg.header.cmd = RX_RESTART;
408 }
409
410 return imx_rpmsg_insert_workqueue(substream, msg, info);
411 }
412
413 static int imx_rpmsg_pause(struct snd_soc_component *component,
414 struct snd_pcm_substream *substream)
415 {
416 struct rpmsg_info *info = dev_get_drvdata(component->dev);
417 struct rpmsg_msg *msg;
418
419 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
420 msg = &info->msg[TX_PAUSE];
421 msg->s_msg.header.cmd = TX_PAUSE;
422 } else {
423 msg = &info->msg[RX_PAUSE];
424 msg->s_msg.header.cmd = RX_PAUSE;
425 }
426
427 return imx_rpmsg_insert_workqueue(substream, msg, info);
428 }
429
430 static int imx_rpmsg_terminate_all(struct snd_soc_component *component,
431 struct snd_pcm_substream *substream)
432 {
433 struct rpmsg_info *info = dev_get_drvdata(component->dev);
434 struct rpmsg_msg *msg;
435 int cmd;
436
437 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
438 msg = &info->msg[TX_TERMINATE];
439 msg->s_msg.header.cmd = TX_TERMINATE;
440 /* Clear buffer count*/
441 cmd = TX_PERIOD_DONE + MSG_TYPE_A_NUM;
442 info->msg[cmd].s_msg.param.buffer_tail = 0;
443 info->msg[cmd].r_msg.param.buffer_tail = 0;
444 info->msg[TX_POINTER].r_msg.param.buffer_offset = 0;
445 } else {
446 msg = &info->msg[RX_TERMINATE];
447 msg->s_msg.header.cmd = RX_TERMINATE;
448 /* Clear buffer count*/
449 cmd = RX_PERIOD_DONE + MSG_TYPE_A_NUM;
450 info->msg[cmd].s_msg.param.buffer_tail = 0;
451 info->msg[cmd].r_msg.param.buffer_tail = 0;
452 info->msg[RX_POINTER].r_msg.param.buffer_offset = 0;
453 }
454
455 del_timer(&info->stream_timer[substream->stream].timer);
456
457 return imx_rpmsg_insert_workqueue(substream, msg, info);
458 }
459
460 static int imx_rpmsg_pcm_trigger(struct snd_soc_component *component,
461 struct snd_pcm_substream *substream, int cmd)
462 {
463 struct snd_pcm_runtime *runtime = substream->runtime;
464 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
465 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
466 struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
467 int ret = 0;
468
469 switch (cmd) {
470 case SNDRV_PCM_TRIGGER_START:
471 ret = imx_rpmsg_prepare_and_submit(component, substream);
472 if (ret)
473 return ret;
474 ret = imx_rpmsg_async_issue_pending(component, substream);
475 break;
476 case SNDRV_PCM_TRIGGER_RESUME:
477 if (rpmsg->force_lpa)
478 break;
479 fallthrough;
480 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
481 ret = imx_rpmsg_restart(component, substream);
482 break;
483 case SNDRV_PCM_TRIGGER_SUSPEND:
484 if (!rpmsg->force_lpa) {
485 if (runtime->info & SNDRV_PCM_INFO_PAUSE)
486 ret = imx_rpmsg_pause(component, substream);
487 else
488 ret = imx_rpmsg_terminate_all(component, substream);
489 }
490 break;
491 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
492 ret = imx_rpmsg_pause(component, substream);
493 break;
494 case SNDRV_PCM_TRIGGER_STOP:
495 ret = imx_rpmsg_terminate_all(component, substream);
496 break;
497 default:
498 return -EINVAL;
499 }
500
501 if (ret)
502 return ret;
503
504 return 0;
505 }
506
507 /*
508 * imx_rpmsg_pcm_ack
509 *
510 * Send the period index to M core through rpmsg, but not send
511 * all the period index to M core, reduce some unnessesary msg
512 * to reduce the pressure of rpmsg bandwidth.
513 */
514 static int imx_rpmsg_pcm_ack(struct snd_soc_component *component,
515 struct snd_pcm_substream *substream)
516 {
517 struct snd_pcm_runtime *runtime = substream->runtime;
518 struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
519 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
520 struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
521 struct rpmsg_info *info = dev_get_drvdata(component->dev);
522 snd_pcm_uframes_t period_size = runtime->period_size;
523 snd_pcm_sframes_t avail;
524 struct timer_list *timer;
525 struct rpmsg_msg *msg;
526 unsigned long flags;
527 int buffer_tail = 0;
528 int written_num;
529
530 if (!rpmsg->force_lpa)
531 return 0;
532
533 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
534 msg = &info->msg[TX_PERIOD_DONE + MSG_TYPE_A_NUM];
535 msg->s_msg.header.cmd = TX_PERIOD_DONE;
536 } else {
537 msg = &info->msg[RX_PERIOD_DONE + MSG_TYPE_A_NUM];
538 msg->s_msg.header.cmd = RX_PERIOD_DONE;
539 }
540
541 msg->s_msg.header.type = MSG_TYPE_C;
542
543 buffer_tail = (frames_to_bytes(runtime, runtime->control->appl_ptr) %
544 snd_pcm_lib_buffer_bytes(substream));
545 buffer_tail = buffer_tail / snd_pcm_lib_period_bytes(substream);
546
547 /* There is update for period index */
548 if (buffer_tail != msg->s_msg.param.buffer_tail) {
549 written_num = buffer_tail - msg->s_msg.param.buffer_tail;
550 if (written_num < 0)
551 written_num += runtime->periods;
552
553 msg->s_msg.param.buffer_tail = buffer_tail;
554
555 /* The notification message is updated to latest */
556 spin_lock_irqsave(&info->lock[substream->stream], flags);
557 memcpy(&info->notify[substream->stream], msg,
558 sizeof(struct rpmsg_s_msg));
559 info->notify_updated[substream->stream] = true;
560 spin_unlock_irqrestore(&info->lock[substream->stream], flags);
561
562 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
563 avail = snd_pcm_playback_hw_avail(runtime);
564 else
565 avail = snd_pcm_capture_hw_avail(runtime);
566
567 timer = &info->stream_timer[substream->stream].timer;
568 /*
569 * If the data in the buffer is less than one period before
570 * this fill, which means the data may not enough on M
571 * core side, we need to send message immediately to let
572 * M core know the pointer is updated.
573 * if there is more than one period data in the buffer before
574 * this fill, which means the data is enough on M core side,
575 * we can delay one period (using timer) to send the message
576 * for reduce the message number in workqueue, because the
577 * pointer may be updated by ack function later, we can
578 * send latest pointer to M core side.
579 */
580 if ((avail - written_num * period_size) <= period_size) {
581 imx_rpmsg_insert_workqueue(substream, msg, info);
582 } else if (rpmsg->force_lpa && !timer_pending(timer)) {
583 int time_msec;
584
585 time_msec = (int)(runtime->period_size * 1000 / runtime->rate);
586 mod_timer(timer, jiffies + msecs_to_jiffies(time_msec));
587 }
588 }
589
590 return 0;
591 }
592
593 static int imx_rpmsg_pcm_new(struct snd_soc_component *component,
594 struct snd_soc_pcm_runtime *rtd)
595 {
596 struct snd_card *card = rtd->card->snd_card;
597 struct snd_pcm *pcm = rtd->pcm;
598 struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
599 struct fsl_rpmsg *rpmsg = dev_get_drvdata(cpu_dai->dev);
600 int ret;
601
602 ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
603 if (ret)
604 return ret;
605
606 return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_WC,
607 pcm->card->dev, rpmsg->buffer_size);
608 }
609
610 static const struct snd_soc_component_driver imx_rpmsg_soc_component = {
611 .name = IMX_PCM_DRV_NAME,
612 .pcm_construct = imx_rpmsg_pcm_new,
613 .open = imx_rpmsg_pcm_open,
614 .close = imx_rpmsg_pcm_close,
615 .hw_params = imx_rpmsg_pcm_hw_params,
616 .trigger = imx_rpmsg_pcm_trigger,
617 .pointer = imx_rpmsg_pcm_pointer,
618 .ack = imx_rpmsg_pcm_ack,
619 .prepare = imx_rpmsg_pcm_prepare,
620 };
621
622 static void imx_rpmsg_pcm_work(struct work_struct *work)
623 {
624 struct work_of_rpmsg *work_of_rpmsg;
625 bool is_notification = false;
626 struct rpmsg_info *info;
627 struct rpmsg_msg msg;
628 unsigned long flags;
629
630 work_of_rpmsg = container_of(work, struct work_of_rpmsg, work);
631 info = work_of_rpmsg->info;
632
633 /*
634 * Every work in the work queue, first we check if there
635 * is update for period is filled, because there may be not
636 * enough data in M core side, need to let M core know
637 * data is updated immediately.
638 */
639 spin_lock_irqsave(&info->lock[TX], flags);
640 if (info->notify_updated[TX]) {
641 memcpy(&msg, &info->notify[TX], sizeof(struct rpmsg_s_msg));
642 info->notify_updated[TX] = false;
643 spin_unlock_irqrestore(&info->lock[TX], flags);
644 info->send_message(&msg, info);
645 } else {
646 spin_unlock_irqrestore(&info->lock[TX], flags);
647 }
648
649 spin_lock_irqsave(&info->lock[RX], flags);
650 if (info->notify_updated[RX]) {
651 memcpy(&msg, &info->notify[RX], sizeof(struct rpmsg_s_msg));
652 info->notify_updated[RX] = false;
653 spin_unlock_irqrestore(&info->lock[RX], flags);
654 info->send_message(&msg, info);
655 } else {
656 spin_unlock_irqrestore(&info->lock[RX], flags);
657 }
658
659 /* Skip the notification message for it has been processed above */
660 if (work_of_rpmsg->msg.s_msg.header.type == MSG_TYPE_C &&
661 (work_of_rpmsg->msg.s_msg.header.cmd == TX_PERIOD_DONE ||
662 work_of_rpmsg->msg.s_msg.header.cmd == RX_PERIOD_DONE))
663 is_notification = true;
664
665 if (!is_notification)
666 info->send_message(&work_of_rpmsg->msg, info);
667
668 /* update read index */
669 spin_lock_irqsave(&info->wq_lock, flags);
670 info->work_read_index++;
671 info->work_read_index %= WORK_MAX_NUM;
672 spin_unlock_irqrestore(&info->wq_lock, flags);
673 }
674
675 static int imx_rpmsg_pcm_probe(struct platform_device *pdev)
676 {
677 struct snd_soc_component *component;
678 struct rpmsg_info *info;
679 int ret, i;
680
681 info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
682 if (!info)
683 return -ENOMEM;
684
685 platform_set_drvdata(pdev, info);
686
687 info->rpdev = container_of(pdev->dev.parent, struct rpmsg_device, dev);
688 info->dev = &pdev->dev;
689 /* Setup work queue */
690 info->rpmsg_wq = alloc_ordered_workqueue(info->rpdev->id.name,
691 WQ_HIGHPRI |
692 WQ_UNBOUND |
693 WQ_FREEZABLE);
694 if (!info->rpmsg_wq) {
695 dev_err(&pdev->dev, "workqueue create failed\n");
696 return -ENOMEM;
697 }
698
699 /* Write index initialize 1, make it differ with the read index */
700 info->work_write_index = 1;
701 info->send_message = imx_rpmsg_pcm_send_message;
702
703 for (i = 0; i < WORK_MAX_NUM; i++) {
704 INIT_WORK(&info->work_list[i].work, imx_rpmsg_pcm_work);
705 info->work_list[i].info = info;
706 }
707
708 /* Initialize msg */
709 for (i = 0; i < MSG_MAX_NUM; i++) {
710 info->msg[i].s_msg.header.cate = IMX_RPMSG_AUDIO;
711 info->msg[i].s_msg.header.major = IMX_RMPSG_MAJOR;
712 info->msg[i].s_msg.header.minor = IMX_RMPSG_MINOR;
713 info->msg[i].s_msg.header.type = MSG_TYPE_A;
714 info->msg[i].s_msg.param.audioindex = 0;
715 }
716
717 init_completion(&info->cmd_complete);
718 mutex_init(&info->msg_lock);
719 spin_lock_init(&info->lock[TX]);
720 spin_lock_init(&info->lock[RX]);
721 spin_lock_init(&info->wq_lock);
722
723 ret = devm_snd_soc_register_component(&pdev->dev,
724 &imx_rpmsg_soc_component,
725 NULL, 0);
726 if (ret)
727 goto fail;
728
729 component = snd_soc_lookup_component(&pdev->dev, NULL);
730 if (!component) {
731 ret = -EINVAL;
732 goto fail;
733 }
734
735 #ifdef CONFIG_DEBUG_FS
736 component->debugfs_prefix = "rpmsg";
737 #endif
738
739 return 0;
740
741 fail:
742 if (info->rpmsg_wq)
743 destroy_workqueue(info->rpmsg_wq);
744
745 return ret;
746 }
747
748 static void imx_rpmsg_pcm_remove(struct platform_device *pdev)
749 {
750 struct rpmsg_info *info = platform_get_drvdata(pdev);
751
752 if (info->rpmsg_wq)
753 destroy_workqueue(info->rpmsg_wq);
754 }
755
756 #ifdef CONFIG_PM
757 static int imx_rpmsg_pcm_runtime_resume(struct device *dev)
758 {
759 struct rpmsg_info *info = dev_get_drvdata(dev);
760
761 cpu_latency_qos_add_request(&info->pm_qos_req, 0);
762
763 return 0;
764 }
765
766 static int imx_rpmsg_pcm_runtime_suspend(struct device *dev)
767 {
768 struct rpmsg_info *info = dev_get_drvdata(dev);
769
770 cpu_latency_qos_remove_request(&info->pm_qos_req);
771
772 return 0;
773 }
774 #endif
775
776 #ifdef CONFIG_PM_SLEEP
777 static int imx_rpmsg_pcm_suspend(struct device *dev)
778 {
779 struct rpmsg_info *info = dev_get_drvdata(dev);
780 struct rpmsg_msg *rpmsg_tx;
781 struct rpmsg_msg *rpmsg_rx;
782
783 rpmsg_tx = &info->msg[TX_SUSPEND];
784 rpmsg_rx = &info->msg[RX_SUSPEND];
785
786 rpmsg_tx->s_msg.header.cmd = TX_SUSPEND;
787 info->send_message(rpmsg_tx, info);
788
789 rpmsg_rx->s_msg.header.cmd = RX_SUSPEND;
790 info->send_message(rpmsg_rx, info);
791
792 return 0;
793 }
794
795 static int imx_rpmsg_pcm_resume(struct device *dev)
796 {
797 struct rpmsg_info *info = dev_get_drvdata(dev);
798 struct rpmsg_msg *rpmsg_tx;
799 struct rpmsg_msg *rpmsg_rx;
800
801 rpmsg_tx = &info->msg[TX_RESUME];
802 rpmsg_rx = &info->msg[RX_RESUME];
803
804 rpmsg_tx->s_msg.header.cmd = TX_RESUME;
805 info->send_message(rpmsg_tx, info);
806
807 rpmsg_rx->s_msg.header.cmd = RX_RESUME;
808 info->send_message(rpmsg_rx, info);
809
810 return 0;
811 }
812 #endif /* CONFIG_PM_SLEEP */
813
814 static const struct dev_pm_ops imx_rpmsg_pcm_pm_ops = {
815 SET_RUNTIME_PM_OPS(imx_rpmsg_pcm_runtime_suspend,
816 imx_rpmsg_pcm_runtime_resume,
817 NULL)
818 SET_SYSTEM_SLEEP_PM_OPS(imx_rpmsg_pcm_suspend,
819 imx_rpmsg_pcm_resume)
820 };
821
822 static const struct platform_device_id imx_rpmsg_pcm_id_table[] = {
823 { .name = "rpmsg-audio-channel" },
824 { .name = "rpmsg-micfil-channel" },
825 { },
826 };
827 MODULE_DEVICE_TABLE(platform, imx_rpmsg_pcm_id_table);
828
829 static struct platform_driver imx_pcm_rpmsg_driver = {
830 .probe = imx_rpmsg_pcm_probe,
831 .remove_new = imx_rpmsg_pcm_remove,
832 .id_table = imx_rpmsg_pcm_id_table,
833 .driver = {
834 .name = IMX_PCM_DRV_NAME,
835 .pm = &imx_rpmsg_pcm_pm_ops,
836 },
837 };
838 module_platform_driver(imx_pcm_rpmsg_driver);
839
840 MODULE_DESCRIPTION("Freescale SoC Audio RPMSG PCM interface");
841 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
842 MODULE_ALIAS("platform:" IMX_PCM_DRV_NAME);
843 MODULE_LICENSE("GPL v2");
844
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