1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  sst_mfld_platform.c - Intel MID Platform driver
4  *
5  *  Copyright (C) 2010-2014 Intel Corp
6  *  Author: Vinod Koul <vinod.koul@intel.com>
7  *  Author: Harsha Priya <priya.harsha@intel.com>
8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9  *
10  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
11  */
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 
14 #include <linux/slab.h>
15 #include <linux/io.h>
16 #include <linux/module.h>
17 #include <sound/core.h>
18 #include <sound/pcm.h>
19 #include <sound/pcm_params.h>
20 #include <sound/soc.h>
21 #include <sound/compress_driver.h>
22 #include <asm/platform_sst_audio.h>
23 #include "sst-mfld-platform.h"
24 #include "sst-atom-controls.h"
25 
26 struct sst_device *sst;
27 static DEFINE_MUTEX(sst_lock);
28 
29 int sst_register_dsp(struct sst_device *dev)
30 {
31 	if (WARN_ON(!dev))
32 		return -EINVAL;
33 	if (!try_module_get(dev->dev->driver->owner))
34 		return -ENODEV;
35 	mutex_lock(&sst_lock);
36 	if (sst) {
37 		dev_err(dev->dev, "we already have a device %s\n", sst->name);
38 		module_put(dev->dev->driver->owner);
39 		mutex_unlock(&sst_lock);
40 		return -EEXIST;
41 	}
42 	dev_dbg(dev->dev, "registering device %s\n", dev->name);
43 	sst = dev;
44 	mutex_unlock(&sst_lock);
45 	return 0;
46 }
47 EXPORT_SYMBOL_GPL(sst_register_dsp);
48 
49 int sst_unregister_dsp(struct sst_device *dev)
50 {
51 	if (WARN_ON(!dev))
52 		return -EINVAL;
53 	if (dev != sst)
54 		return -EINVAL;
55 
56 	mutex_lock(&sst_lock);
57 
58 	if (!sst) {
59 		mutex_unlock(&sst_lock);
60 		return -EIO;
61 	}
62 
63 	module_put(sst->dev->driver->owner);
64 	dev_dbg(dev->dev, "unreg %s\n", sst->name);
65 	sst = NULL;
66 	mutex_unlock(&sst_lock);
67 	return 0;
68 }
69 EXPORT_SYMBOL_GPL(sst_unregister_dsp);
70 
71 static const struct snd_pcm_hardware sst_platform_pcm_hw = {
72 	.info =	(SNDRV_PCM_INFO_INTERLEAVED |
73 			SNDRV_PCM_INFO_DOUBLE |
74 			SNDRV_PCM_INFO_PAUSE |
75 			SNDRV_PCM_INFO_RESUME |
76 			SNDRV_PCM_INFO_MMAP|
77 			SNDRV_PCM_INFO_MMAP_VALID |
78 			SNDRV_PCM_INFO_BLOCK_TRANSFER |
79 			SNDRV_PCM_INFO_SYNC_START),
80 	.buffer_bytes_max = SST_MAX_BUFFER,
81 	.period_bytes_min = SST_MIN_PERIOD_BYTES,
82 	.period_bytes_max = SST_MAX_PERIOD_BYTES,
83 	.periods_min = SST_MIN_PERIODS,
84 	.periods_max = SST_MAX_PERIODS,
85 	.fifo_size = SST_FIFO_SIZE,
86 };
87 
88 static struct sst_dev_stream_map dpcm_strm_map[] = {
89 	{0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}, /* Reserved, not in use */
90 	{MERR_DPCM_AUDIO, 0, SNDRV_PCM_STREAM_PLAYBACK, PIPE_MEDIA1_IN, SST_TASK_ID_MEDIA, 0},
91 	{MERR_DPCM_COMPR, 0, SNDRV_PCM_STREAM_PLAYBACK, PIPE_MEDIA0_IN, SST_TASK_ID_MEDIA, 0},
92 	{MERR_DPCM_AUDIO, 0, SNDRV_PCM_STREAM_CAPTURE, PIPE_PCM1_OUT, SST_TASK_ID_MEDIA, 0},
93 	{MERR_DPCM_DEEP_BUFFER, 0, SNDRV_PCM_STREAM_PLAYBACK, PIPE_MEDIA3_IN, SST_TASK_ID_MEDIA, 0},
94 };
95 
96 static int sst_media_digital_mute(struct snd_soc_dai *dai, int mute, int stream)
97 {
98 
99 	return sst_send_pipe_gains(dai, stream, mute);
100 }
101 
102 /* helper functions */
103 void sst_set_stream_status(struct sst_runtime_stream *stream,
104 					int state)
105 {
106 	unsigned long flags;
107 	spin_lock_irqsave(&stream->status_lock, flags);
108 	stream->stream_status = state;
109 	spin_unlock_irqrestore(&stream->status_lock, flags);
110 }
111 
112 static inline int sst_get_stream_status(struct sst_runtime_stream *stream)
113 {
114 	int state;
115 	unsigned long flags;
116 
117 	spin_lock_irqsave(&stream->status_lock, flags);
118 	state = stream->stream_status;
119 	spin_unlock_irqrestore(&stream->status_lock, flags);
120 	return state;
121 }
122 
123 static void sst_fill_alloc_params(struct snd_pcm_substream *substream,
124 				struct snd_sst_alloc_params_ext *alloc_param)
125 {
126 	unsigned int channels;
127 	snd_pcm_uframes_t period_size;
128 	ssize_t periodbytes;
129 	ssize_t buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
130 	u32 buffer_addr = substream->runtime->dma_addr;
131 
132 	channels = substream->runtime->channels;
133 	period_size = substream->runtime->period_size;
134 	periodbytes = samples_to_bytes(substream->runtime, period_size);
135 	alloc_param->ring_buf_info[0].addr = buffer_addr;
136 	alloc_param->ring_buf_info[0].size = buffer_bytes;
137 	alloc_param->sg_count = 1;
138 	alloc_param->reserved = 0;
139 	alloc_param->frag_size = periodbytes * channels;
140 
141 }
142 static void sst_fill_pcm_params(struct snd_pcm_substream *substream,
143 				struct snd_sst_stream_params *param)
144 {
145 	param->uc.pcm_params.num_chan = (u8) substream->runtime->channels;
146 	param->uc.pcm_params.pcm_wd_sz = substream->runtime->sample_bits;
147 	param->uc.pcm_params.sfreq = substream->runtime->rate;
148 
149 	/* PCM stream via ALSA interface */
150 	param->uc.pcm_params.use_offload_path = 0;
151 	param->uc.pcm_params.reserved2 = 0;
152 	memset(param->uc.pcm_params.channel_map, 0, sizeof(u8));
153 
154 }
155 
156 static int sst_get_stream_mapping(int dev, int sdev, int dir,
157 	struct sst_dev_stream_map *map, int size)
158 {
159 	int i;
160 
161 	if (map == NULL)
162 		return -EINVAL;
163 
164 
165 	/* index 0 is not used in stream map */
166 	for (i = 1; i < size; i++) {
167 		if ((map[i].dev_num == dev) && (map[i].direction == dir))
168 			return i;
169 	}
170 	return 0;
171 }
172 
173 int sst_fill_stream_params(void *substream,
174 	const struct sst_data *ctx, struct snd_sst_params *str_params, bool is_compress)
175 {
176 	int map_size;
177 	int index;
178 	struct sst_dev_stream_map *map;
179 	struct snd_pcm_substream *pstream = NULL;
180 	struct snd_compr_stream *cstream = NULL;
181 
182 	map = ctx->pdata->pdev_strm_map;
183 	map_size = ctx->pdata->strm_map_size;
184 
185 	if (is_compress)
186 		cstream = (struct snd_compr_stream *)substream;
187 	else
188 		pstream = (struct snd_pcm_substream *)substream;
189 
190 	str_params->stream_type = SST_STREAM_TYPE_MUSIC;
191 
192 	/* For pcm streams */
193 	if (pstream) {
194 		index = sst_get_stream_mapping(pstream->pcm->device,
195 					  pstream->number, pstream->stream,
196 					  map, map_size);
197 		if (index <= 0)
198 			return -EINVAL;
199 
200 		str_params->stream_id = index;
201 		str_params->device_type = map[index].device_id;
202 		str_params->task = map[index].task_id;
203 
204 		str_params->ops = (u8)pstream->stream;
205 	}
206 
207 	if (cstream) {
208 		index = sst_get_stream_mapping(cstream->device->device,
209 					       0, cstream->direction,
210 					       map, map_size);
211 		if (index <= 0)
212 			return -EINVAL;
213 		str_params->stream_id = index;
214 		str_params->device_type = map[index].device_id;
215 		str_params->task = map[index].task_id;
216 
217 		str_params->ops = (u8)cstream->direction;
218 	}
219 	return 0;
220 }
221 
222 static int sst_platform_alloc_stream(struct snd_pcm_substream *substream,
223 		struct snd_soc_dai *dai)
224 {
225 	struct sst_runtime_stream *stream =
226 			substream->runtime->private_data;
227 	struct snd_sst_stream_params param = {{{0,},},};
228 	struct snd_sst_params str_params = {0};
229 	struct snd_sst_alloc_params_ext alloc_params = {0};
230 	int ret_val = 0;
231 	struct sst_data *ctx = snd_soc_dai_get_drvdata(dai);
232 
233 	/* set codec params and inform SST driver the same */
234 	sst_fill_pcm_params(substream, &param);
235 	sst_fill_alloc_params(substream, &alloc_params);
236 	str_params.sparams = param;
237 	str_params.aparams = alloc_params;
238 	str_params.codec = SST_CODEC_TYPE_PCM;
239 
240 	/* fill the device type and stream id to pass to SST driver */
241 	ret_val = sst_fill_stream_params(substream, ctx, &str_params, false);
242 	if (ret_val < 0)
243 		return ret_val;
244 
245 	stream->stream_info.str_id = str_params.stream_id;
246 
247 	ret_val = stream->ops->open(sst->dev, &str_params);
248 	if (ret_val <= 0)
249 		return ret_val;
250 
251 
252 	return ret_val;
253 }
254 
255 static void sst_period_elapsed(void *arg)
256 {
257 	struct snd_pcm_substream *substream = arg;
258 	struct sst_runtime_stream *stream;
259 	int status;
260 
261 	if (!substream || !substream->runtime)
262 		return;
263 	stream = substream->runtime->private_data;
264 	if (!stream)
265 		return;
266 	status = sst_get_stream_status(stream);
267 	if (status != SST_PLATFORM_RUNNING)
268 		return;
269 	snd_pcm_period_elapsed(substream);
270 }
271 
272 static int sst_platform_init_stream(struct snd_pcm_substream *substream)
273 {
274 	struct sst_runtime_stream *stream =
275 			substream->runtime->private_data;
276 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
277 	int ret_val;
278 
279 	dev_dbg(rtd->dev, "setting buffer ptr param\n");
280 	sst_set_stream_status(stream, SST_PLATFORM_INIT);
281 	stream->stream_info.period_elapsed = sst_period_elapsed;
282 	stream->stream_info.arg = substream;
283 	stream->stream_info.buffer_ptr = 0;
284 	stream->stream_info.sfreq = substream->runtime->rate;
285 	ret_val = stream->ops->stream_init(sst->dev, &stream->stream_info);
286 	if (ret_val)
287 		dev_err(rtd->dev, "control_set ret error %d\n", ret_val);
288 	return ret_val;
289 
290 }
291 
292 static int power_up_sst(struct sst_runtime_stream *stream)
293 {
294 	return stream->ops->power(sst->dev, true);
295 }
296 
297 static void power_down_sst(struct sst_runtime_stream *stream)
298 {
299 	stream->ops->power(sst->dev, false);
300 }
301 
302 static int sst_media_open(struct snd_pcm_substream *substream,
303 		struct snd_soc_dai *dai)
304 {
305 	int ret_val = 0;
306 	struct snd_pcm_runtime *runtime = substream->runtime;
307 	struct sst_runtime_stream *stream;
308 
309 	stream = kzalloc(sizeof(*stream), GFP_KERNEL);
310 	if (!stream)
311 		return -ENOMEM;
312 	spin_lock_init(&stream->status_lock);
313 
314 	/* get the sst ops */
315 	mutex_lock(&sst_lock);
316 	if (!sst ||
317 	    !try_module_get(sst->dev->driver->owner)) {
318 		dev_err(dai->dev, "no device available to run\n");
319 		ret_val = -ENODEV;
320 		goto out_ops;
321 	}
322 	stream->ops = sst->ops;
323 	mutex_unlock(&sst_lock);
324 
325 	stream->stream_info.str_id = 0;
326 
327 	stream->stream_info.arg = substream;
328 	/* allocate memory for SST API set */
329 	runtime->private_data = stream;
330 
331 	ret_val = power_up_sst(stream);
332 	if (ret_val < 0)
333 		goto out_power_up;
334 
335 	/*
336 	 * Make sure the period to be multiple of 1ms to align the
337 	 * design of firmware. Apply same rule to buffer size to make
338 	 * sure alsa could always find a value for period size
339 	 * regardless the buffer size given by user space.
340 	 */
341 	snd_pcm_hw_constraint_step(substream->runtime, 0,
342 			   SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 48);
343 	snd_pcm_hw_constraint_step(substream->runtime, 0,
344 			   SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 48);
345 
346 	/* Make sure, that the period size is always even */
347 	snd_pcm_hw_constraint_step(substream->runtime, 0,
348 			   SNDRV_PCM_HW_PARAM_PERIODS, 2);
349 
350 	return snd_pcm_hw_constraint_integer(runtime,
351 			 SNDRV_PCM_HW_PARAM_PERIODS);
352 out_ops:
353 	mutex_unlock(&sst_lock);
354 out_power_up:
355 	kfree(stream);
356 	return ret_val;
357 }
358 
359 static void sst_media_close(struct snd_pcm_substream *substream,
360 		struct snd_soc_dai *dai)
361 {
362 	struct sst_runtime_stream *stream;
363 	int str_id;
364 
365 	stream = substream->runtime->private_data;
366 	power_down_sst(stream);
367 
368 	str_id = stream->stream_info.str_id;
369 	if (str_id)
370 		stream->ops->close(sst->dev, str_id);
371 	module_put(sst->dev->driver->owner);
372 	kfree(stream);
373 }
374 
375 static int sst_media_prepare(struct snd_pcm_substream *substream,
376 		struct snd_soc_dai *dai)
377 {
378 	struct sst_runtime_stream *stream;
379 	int ret_val, str_id;
380 
381 	stream = substream->runtime->private_data;
382 	str_id = stream->stream_info.str_id;
383 	if (stream->stream_info.str_id) {
384 		ret_val = stream->ops->stream_drop(sst->dev, str_id);
385 		return ret_val;
386 	}
387 
388 	ret_val = sst_platform_alloc_stream(substream, dai);
389 	if (ret_val <= 0)
390 		return ret_val;
391 	snprintf(substream->pcm->id, sizeof(substream->pcm->id),
392 			"%d", stream->stream_info.str_id);
393 
394 	ret_val = sst_platform_init_stream(substream);
395 	if (ret_val)
396 		return ret_val;
397 	substream->runtime->hw.info = SNDRV_PCM_INFO_BLOCK_TRANSFER;
398 	return 0;
399 }
400 
401 static int sst_enable_ssp(struct snd_pcm_substream *substream,
402 			struct snd_soc_dai *dai)
403 {
404 	int ret = 0;
405 
406 	if (!snd_soc_dai_active(dai)) {
407 		ret = sst_handle_vb_timer(dai, true);
408 		sst_fill_ssp_defaults(dai);
409 	}
410 	return ret;
411 }
412 
413 static int sst_be_hw_params(struct snd_pcm_substream *substream,
414 				struct snd_pcm_hw_params *params,
415 				struct snd_soc_dai *dai)
416 {
417 	int ret = 0;
418 
419 	if (snd_soc_dai_active(dai) == 1)
420 		ret = send_ssp_cmd(dai, dai->name, 1);
421 	return ret;
422 }
423 
424 static int sst_set_format(struct snd_soc_dai *dai, unsigned int fmt)
425 {
426 	int ret = 0;
427 
428 	if (!snd_soc_dai_active(dai))
429 		return 0;
430 
431 	ret = sst_fill_ssp_config(dai, fmt);
432 	if (ret < 0)
433 		dev_err(dai->dev, "sst_set_format failed..\n");
434 
435 	return ret;
436 }
437 
438 static int sst_platform_set_ssp_slot(struct snd_soc_dai *dai,
439 			unsigned int tx_mask, unsigned int rx_mask,
440 			int slots, int slot_width) {
441 	int ret = 0;
442 
443 	if (!snd_soc_dai_active(dai))
444 		return ret;
445 
446 	ret = sst_fill_ssp_slot(dai, tx_mask, rx_mask, slots, slot_width);
447 	if (ret < 0)
448 		dev_err(dai->dev, "sst_fill_ssp_slot failed..%d\n", ret);
449 
450 	return ret;
451 }
452 
453 static void sst_disable_ssp(struct snd_pcm_substream *substream,
454 			struct snd_soc_dai *dai)
455 {
456 	if (!snd_soc_dai_active(dai)) {
457 		send_ssp_cmd(dai, dai->name, 0);
458 		sst_handle_vb_timer(dai, false);
459 	}
460 }
461 
462 static const struct snd_soc_dai_ops sst_media_dai_ops = {
463 	.startup = sst_media_open,
464 	.shutdown = sst_media_close,
465 	.prepare = sst_media_prepare,
466 	.mute_stream = sst_media_digital_mute,
467 };
468 
469 static const struct snd_soc_dai_ops sst_compr_dai_ops = {
470 	.mute_stream = sst_media_digital_mute,
471 };
472 
473 static const struct snd_soc_dai_ops sst_be_dai_ops = {
474 	.startup = sst_enable_ssp,
475 	.hw_params = sst_be_hw_params,
476 	.set_fmt = sst_set_format,
477 	.set_tdm_slot = sst_platform_set_ssp_slot,
478 	.shutdown = sst_disable_ssp,
479 };
480 
481 static struct snd_soc_dai_driver sst_platform_dai[] = {
482 {
483 	.name = "media-cpu-dai",
484 	.ops = &sst_media_dai_ops,
485 	.playback = {
486 		.stream_name = "Headset Playback",
487 		.channels_min = SST_STEREO,
488 		.channels_max = SST_STEREO,
489 		.rates = SNDRV_PCM_RATE_48000,
490 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
491 	},
492 	.capture = {
493 		.stream_name = "Headset Capture",
494 		.channels_min = 1,
495 		.channels_max = 2,
496 		.rates = SNDRV_PCM_RATE_48000,
497 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
498 	},
499 },
500 {
501 	.name = "deepbuffer-cpu-dai",
502 	.ops = &sst_media_dai_ops,
503 	.playback = {
504 		.stream_name = "Deepbuffer Playback",
505 		.channels_min = SST_STEREO,
506 		.channels_max = SST_STEREO,
507 		.rates = SNDRV_PCM_RATE_48000,
508 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
509 	},
510 },
511 {
512 	.name = "compress-cpu-dai",
513 	.compress_new = snd_soc_new_compress,
514 	.ops = &sst_compr_dai_ops,
515 	.playback = {
516 		.stream_name = "Compress Playback",
517 		.channels_min = 1,
518 	},
519 },
520 /* BE CPU  Dais */
521 {
522 	.name = "ssp0-port",
523 	.ops = &sst_be_dai_ops,
524 	.playback = {
525 		.stream_name = "ssp0 Tx",
526 		.channels_min = SST_STEREO,
527 		.channels_max = SST_STEREO,
528 		.rates = SNDRV_PCM_RATE_48000,
529 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
530 	},
531 	.capture = {
532 		.stream_name = "ssp0 Rx",
533 		.channels_min = SST_STEREO,
534 		.channels_max = SST_STEREO,
535 		.rates = SNDRV_PCM_RATE_48000,
536 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
537 	},
538 },
539 {
540 	.name = "ssp1-port",
541 	.ops = &sst_be_dai_ops,
542 	.playback = {
543 		.stream_name = "ssp1 Tx",
544 		.channels_min = SST_STEREO,
545 		.channels_max = SST_STEREO,
546 		.rates = SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_48000,
547 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
548 	},
549 	.capture = {
550 		.stream_name = "ssp1 Rx",
551 		.channels_min = SST_STEREO,
552 		.channels_max = SST_STEREO,
553 		.rates = SNDRV_PCM_RATE_8000|SNDRV_PCM_RATE_16000|SNDRV_PCM_RATE_48000,
554 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
555 	},
556 },
557 {
558 	.name = "ssp2-port",
559 	.ops = &sst_be_dai_ops,
560 	.playback = {
561 		.stream_name = "ssp2 Tx",
562 		.channels_min = SST_STEREO,
563 		.channels_max = SST_STEREO,
564 		.rates = SNDRV_PCM_RATE_48000,
565 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
566 	},
567 	.capture = {
568 		.stream_name = "ssp2 Rx",
569 		.channels_min = SST_STEREO,
570 		.channels_max = SST_STEREO,
571 		.rates = SNDRV_PCM_RATE_48000,
572 		.formats = SNDRV_PCM_FMTBIT_S16_LE,
573 	},
574 },
575 };
576 
577 static int sst_soc_open(struct snd_soc_component *component,
578 			struct snd_pcm_substream *substream)
579 {
580 	struct snd_pcm_runtime *runtime;
581 
582 	if (substream->pcm->internal)
583 		return 0;
584 
585 	runtime = substream->runtime;
586 	runtime->hw = sst_platform_pcm_hw;
587 	return 0;
588 }
589 
590 static int sst_soc_trigger(struct snd_soc_component *component,
591 			   struct snd_pcm_substream *substream, int cmd)
592 {
593 	int ret_val = 0, str_id;
594 	struct sst_runtime_stream *stream;
595 	int status;
596 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
597 
598 	dev_dbg(rtd->dev, "%s called\n", __func__);
599 	if (substream->pcm->internal)
600 		return 0;
601 	stream = substream->runtime->private_data;
602 	str_id = stream->stream_info.str_id;
603 	switch (cmd) {
604 	case SNDRV_PCM_TRIGGER_START:
605 		dev_dbg(rtd->dev, "sst: Trigger Start\n");
606 		status = SST_PLATFORM_RUNNING;
607 		stream->stream_info.arg = substream;
608 		ret_val = stream->ops->stream_start(sst->dev, str_id);
609 		break;
610 	case SNDRV_PCM_TRIGGER_STOP:
611 		dev_dbg(rtd->dev, "sst: in stop\n");
612 		status = SST_PLATFORM_DROPPED;
613 		ret_val = stream->ops->stream_drop(sst->dev, str_id);
614 		break;
615 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
616 	case SNDRV_PCM_TRIGGER_SUSPEND:
617 		dev_dbg(rtd->dev, "sst: in pause\n");
618 		status = SST_PLATFORM_PAUSED;
619 		ret_val = stream->ops->stream_pause(sst->dev, str_id);
620 		break;
621 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
622 	case SNDRV_PCM_TRIGGER_RESUME:
623 		dev_dbg(rtd->dev, "sst: in pause release\n");
624 		status = SST_PLATFORM_RUNNING;
625 		ret_val = stream->ops->stream_pause_release(sst->dev, str_id);
626 		break;
627 	default:
628 		return -EINVAL;
629 	}
630 
631 	if (!ret_val)
632 		sst_set_stream_status(stream, status);
633 
634 	return ret_val;
635 }
636 
637 
638 static snd_pcm_uframes_t sst_soc_pointer(struct snd_soc_component *component,
639 					 struct snd_pcm_substream *substream)
640 {
641 	struct sst_runtime_stream *stream;
642 	int ret_val, status;
643 	struct pcm_stream_info *str_info;
644 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
645 
646 	stream = substream->runtime->private_data;
647 	status = sst_get_stream_status(stream);
648 	if (status == SST_PLATFORM_INIT)
649 		return 0;
650 	str_info = &stream->stream_info;
651 	ret_val = stream->ops->stream_read_tstamp(sst->dev, str_info);
652 	if (ret_val) {
653 		dev_err(rtd->dev, "sst: error code = %d\n", ret_val);
654 		return ret_val;
655 	}
656 	substream->runtime->delay = str_info->pcm_delay;
657 	return str_info->buffer_ptr;
658 }
659 
660 static int sst_soc_pcm_new(struct snd_soc_component *component,
661 			   struct snd_soc_pcm_runtime *rtd)
662 {
663 	struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
664 	struct snd_pcm *pcm = rtd->pcm;
665 
666 	if (dai->driver->playback.channels_min ||
667 			dai->driver->capture.channels_min) {
668 		snd_pcm_set_managed_buffer_all(pcm,
669 			SNDRV_DMA_TYPE_CONTINUOUS,
670 			snd_dma_continuous_data(GFP_DMA),
671 			SST_MIN_BUFFER, SST_MAX_BUFFER);
672 	}
673 	return 0;
674 }
675 
676 static int sst_soc_probe(struct snd_soc_component *component)
677 {
678 	struct sst_data *drv = dev_get_drvdata(component->dev);
679 
680 	drv->soc_card = component->card;
681 	return sst_dsp_init_v2_dpcm(component);
682 }
683 
684 static void sst_soc_remove(struct snd_soc_component *component)
685 {
686 	struct sst_data *drv = dev_get_drvdata(component->dev);
687 
688 	drv->soc_card = NULL;
689 }
690 
691 static const struct snd_soc_component_driver sst_soc_platform_drv  = {
692 	.name		= DRV_NAME,
693 	.probe		= sst_soc_probe,
694 	.remove		= sst_soc_remove,
695 	.open		= sst_soc_open,
696 	.trigger	= sst_soc_trigger,
697 	.pointer	= sst_soc_pointer,
698 	.compress_ops	= &sst_platform_compress_ops,
699 	.pcm_construct	= sst_soc_pcm_new,
700 };
701 
702 static int sst_platform_probe(struct platform_device *pdev)
703 {
704 	struct sst_data *drv;
705 	int ret;
706 	struct sst_platform_data *pdata;
707 
708 	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
709 	if (drv == NULL) {
710 		return -ENOMEM;
711 	}
712 
713 	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
714 	if (pdata == NULL) {
715 		return -ENOMEM;
716 	}
717 
718 	pdata->pdev_strm_map = dpcm_strm_map;
719 	pdata->strm_map_size = ARRAY_SIZE(dpcm_strm_map);
720 	drv->pdata = pdata;
721 	drv->pdev = pdev;
722 	mutex_init(&drv->lock);
723 	dev_set_drvdata(&pdev->dev, drv);
724 
725 	ret = devm_snd_soc_register_component(&pdev->dev, &sst_soc_platform_drv,
726 				sst_platform_dai, ARRAY_SIZE(sst_platform_dai));
727 	if (ret)
728 		dev_err(&pdev->dev, "registering cpu dais failed\n");
729 
730 	return ret;
731 }
732 
733 static int sst_platform_remove(struct platform_device *pdev)
734 {
735 	dev_dbg(&pdev->dev, "sst_platform_remove success\n");
736 	return 0;
737 }
738 
739 #ifdef CONFIG_PM_SLEEP
740 
741 static int sst_soc_prepare(struct device *dev)
742 {
743 	struct sst_data *drv = dev_get_drvdata(dev);
744 	struct snd_soc_pcm_runtime *rtd;
745 
746 	if (!drv->soc_card)
747 		return 0;
748 
749 	/* suspend all pcms first */
750 	snd_soc_suspend(drv->soc_card->dev);
751 	snd_soc_poweroff(drv->soc_card->dev);
752 
753 	/* set the SSPs to idle */
754 	for_each_card_rtds(drv->soc_card, rtd) {
755 		struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
756 
757 		if (snd_soc_dai_active(dai)) {
758 			send_ssp_cmd(dai, dai->name, 0);
759 			sst_handle_vb_timer(dai, false);
760 		}
761 	}
762 
763 	return 0;
764 }
765 
766 static void sst_soc_complete(struct device *dev)
767 {
768 	struct sst_data *drv = dev_get_drvdata(dev);
769 	struct snd_soc_pcm_runtime *rtd;
770 
771 	if (!drv->soc_card)
772 		return;
773 
774 	/* restart SSPs */
775 	for_each_card_rtds(drv->soc_card, rtd) {
776 		struct snd_soc_dai *dai = asoc_rtd_to_cpu(rtd, 0);
777 
778 		if (snd_soc_dai_active(dai)) {
779 			sst_handle_vb_timer(dai, true);
780 			send_ssp_cmd(dai, dai->name, 1);
781 		}
782 	}
783 	snd_soc_resume(drv->soc_card->dev);
784 }
785 
786 #else
787 
788 #define sst_soc_prepare NULL
789 #define sst_soc_complete NULL
790 
791 #endif
792 
793 
794 static const struct dev_pm_ops sst_platform_pm = {
795 	.prepare	= sst_soc_prepare,
796 	.complete	= sst_soc_complete,
797 };
798 
799 static struct platform_driver sst_platform_driver = {
800 	.driver		= {
801 		.name		= "sst-mfld-platform",
802 		.pm             = &sst_platform_pm,
803 	},
804 	.probe		= sst_platform_probe,
805 	.remove		= sst_platform_remove,
806 };
807 
808 module_platform_driver(sst_platform_driver);
809 
810 MODULE_DESCRIPTION("ASoC Intel(R) MID Platform driver");
811 MODULE_AUTHOR("Vinod Koul <vinod.koul@intel.com>");
812 MODULE_AUTHOR("Harsha Priya <priya.harsha@intel.com>");
813 MODULE_LICENSE("GPL v2");
814 MODULE_ALIAS("platform:sst-atom-hifi2-platform");
815 MODULE_ALIAS("platform:sst-mfld-platform");
816