summaryrefslogtreecommitdiff
path: root/sound/soc/sof/pcm.c
blob: 2b876d4974476bd359d4f530cabfeb92776b3164 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
//
// This file is provided under a dual BSD/GPLv2 license.  When using or
// redistributing this file, you may do so under either license.
//
// Copyright(c) 2018 Intel Corporation. All rights reserved.
//
// Author: Liam Girdwood <liam.r.girdwood@linux.intel.com>
//
// PCM Layer, interface between ALSA and IPC.
//

#include <linux/pm_runtime.h>
#include <sound/pcm_params.h>
#include <sound/sof.h>
#include "sof-priv.h"
#include "ops.h"

#define DRV_NAME	"sof-audio-component"

/* Create DMA buffer page table for DSP */
static int create_page_table(struct snd_pcm_substream *substream,
			     unsigned char *dma_area, size_t size)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	struct snd_dma_buffer *dmab = snd_pcm_get_dma_buf(substream);
	int stream = substream->stream;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	return snd_sof_create_page_table(sdev, dmab,
		spcm->stream[stream].page_table.area, size);
}

static int sof_pcm_dsp_params(struct snd_sof_pcm *spcm, struct snd_pcm_substream *substream,
			      const struct sof_ipc_pcm_params_reply *reply)
{
	struct snd_sof_dev *sdev = spcm->sdev;
	/* validate offset */
	int ret = snd_sof_ipc_pcm_params(sdev, substream, reply);

	if (ret < 0)
		dev_err(sdev->dev, "error: got wrong reply for PCM %d\n",
			spcm->pcm.pcm_id);

	return ret;
}

/*
 * sof pcm period elapse work
 */
static void sof_pcm_period_elapsed_work(struct work_struct *work)
{
	struct snd_sof_pcm_stream *sps =
		container_of(work, struct snd_sof_pcm_stream,
			     period_elapsed_work);

	snd_pcm_period_elapsed(sps->substream);
}

/*
 * sof pcm period elapse, this could be called at irq thread context.
 */
void snd_sof_pcm_period_elapsed(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm) {
		dev_err(sdev->dev,
			"error: period elapsed for unknown stream!\n");
		return;
	}

	/*
	 * snd_pcm_period_elapsed() can be called in interrupt context
	 * before IRQ_HANDLED is returned. Inside snd_pcm_period_elapsed(),
	 * when the PCM is done draining or xrun happened, a STOP IPC will
	 * then be sent and this IPC will hit IPC timeout.
	 * To avoid sending IPC before the previous IPC is handled, we
	 * schedule delayed work here to call the snd_pcm_period_elapsed().
	 */
	schedule_work(&spcm->stream[substream->stream].period_elapsed_work);
}
EXPORT_SYMBOL(snd_sof_pcm_period_elapsed);

/* this may get called several times by oss emulation */
static int sof_pcm_hw_params(struct snd_pcm_substream *substream,
			     struct snd_pcm_hw_params *params)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	struct sof_ipc_pcm_params pcm;
	struct sof_ipc_pcm_params_reply ipc_params_reply;
	int ret;

	/* nothing to do for BE */
	if (rtd->dai_link->no_pcm)
		return 0;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	dev_dbg(sdev->dev, "pcm: hw params stream %d dir %d\n",
		spcm->pcm.pcm_id, substream->stream);

	memset(&pcm, 0, sizeof(pcm));

	/* allocate audio buffer pages */
	ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
	if (ret < 0) {
		dev_err(sdev->dev, "error: could not allocate %d bytes for PCM %d\n",
			params_buffer_bytes(params), spcm->pcm.pcm_id);
		return ret;
	}
	if (ret) {
		/*
		 * ret == 1 means the buffer is changed
		 * create compressed page table for audio firmware
		 * ret == 0 means the buffer is not changed
		 * so no need to regenerate the page table
		 */
		ret = create_page_table(substream, runtime->dma_area,
					runtime->dma_bytes);
		if (ret < 0)
			return ret;
	}

	/* number of pages should be rounded up */
	pcm.params.buffer.pages = PFN_UP(runtime->dma_bytes);

	/* set IPC PCM parameters */
	pcm.hdr.size = sizeof(pcm);
	pcm.hdr.cmd = SOF_IPC_GLB_STREAM_MSG | SOF_IPC_STREAM_PCM_PARAMS;
	pcm.comp_id = spcm->stream[substream->stream].comp_id;
	pcm.params.hdr.size = sizeof(pcm.params);
	pcm.params.buffer.phy_addr =
		spcm->stream[substream->stream].page_table.addr;
	pcm.params.buffer.size = runtime->dma_bytes;
	pcm.params.direction = substream->stream;
	pcm.params.sample_valid_bytes = params_width(params) >> 3;
	pcm.params.buffer_fmt = SOF_IPC_BUFFER_INTERLEAVED;
	pcm.params.rate = params_rate(params);
	pcm.params.channels = params_channels(params);
	pcm.params.host_period_bytes = params_period_bytes(params);

	/* container size */
	ret = snd_pcm_format_physical_width(params_format(params));
	if (ret < 0)
		return ret;
	pcm.params.sample_container_bytes = ret >> 3;

	/* format */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16:
		pcm.params.frame_fmt = SOF_IPC_FRAME_S16_LE;
		break;
	case SNDRV_PCM_FORMAT_S24:
		pcm.params.frame_fmt = SOF_IPC_FRAME_S24_4LE;
		break;
	case SNDRV_PCM_FORMAT_S32:
		pcm.params.frame_fmt = SOF_IPC_FRAME_S32_LE;
		break;
	case SNDRV_PCM_FORMAT_FLOAT:
		pcm.params.frame_fmt = SOF_IPC_FRAME_FLOAT;
		break;
	default:
		return -EINVAL;
	}

	/* firmware already configured host stream */
	ret = snd_sof_pcm_platform_hw_params(sdev,
					     substream,
					     params,
					     &pcm.params);
	if (ret < 0) {
		dev_err(sdev->dev, "error: platform hw params failed\n");
		return ret;
	}

	dev_dbg(sdev->dev, "stream_tag %d", pcm.params.stream_tag);

	/* send IPC to the DSP */
	ret = sof_ipc_tx_message(sdev->ipc, pcm.hdr.cmd, &pcm, sizeof(pcm),
				 &ipc_params_reply, sizeof(ipc_params_reply));
	if (ret < 0) {
		dev_err(sdev->dev, "error: hw params ipc failed for stream %d\n",
			pcm.params.stream_tag);
		return ret;
	}

	ret = sof_pcm_dsp_params(spcm, substream, &ipc_params_reply);
	if (ret < 0)
		return ret;

	spcm->prepared[substream->stream] = true;

	/* save pcm hw_params */
	memcpy(&spcm->params[substream->stream], params, sizeof(*params));

	return ret;
}

static int sof_pcm_dsp_pcm_free(struct snd_pcm_substream *substream,
				struct snd_sof_dev *sdev,
				struct snd_sof_pcm *spcm)
{
	struct sof_ipc_stream stream;
	struct sof_ipc_reply reply;
	int ret;

	stream.hdr.size = sizeof(stream);
	stream.hdr.cmd = SOF_IPC_GLB_STREAM_MSG | SOF_IPC_STREAM_PCM_FREE;
	stream.comp_id = spcm->stream[substream->stream].comp_id;

	/* send IPC to the DSP */
	ret = sof_ipc_tx_message(sdev->ipc, stream.hdr.cmd, &stream,
				 sizeof(stream), &reply, sizeof(reply));
	if (!ret)
		spcm->prepared[substream->stream] = false;

	return ret;
}

static int sof_pcm_hw_free(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	int ret, err = 0;

	/* nothing to do for BE */
	if (rtd->dai_link->no_pcm)
		return 0;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	dev_dbg(sdev->dev, "pcm: free stream %d dir %d\n", spcm->pcm.pcm_id,
		substream->stream);

	if (spcm->prepared[substream->stream]) {
		ret = sof_pcm_dsp_pcm_free(substream, sdev, spcm);
		if (ret < 0)
			err = ret;
	}

	snd_pcm_lib_free_pages(substream);

	cancel_work_sync(&spcm->stream[substream->stream].period_elapsed_work);

	ret = snd_sof_pcm_platform_hw_free(sdev, substream);
	if (ret < 0) {
		dev_err(sdev->dev, "error: platform hw free failed\n");
		err = ret;
	}

	return err;
}

static int sof_pcm_prepare(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	int ret;

	/* nothing to do for BE */
	if (rtd->dai_link->no_pcm)
		return 0;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	if (spcm->prepared[substream->stream])
		return 0;

	dev_dbg(sdev->dev, "pcm: prepare stream %d dir %d\n", spcm->pcm.pcm_id,
		substream->stream);

	/* set hw_params */
	ret = sof_pcm_hw_params(substream, &spcm->params[substream->stream]);
	if (ret < 0) {
		dev_err(sdev->dev, "error: set pcm hw_params after resume\n");
		return ret;
	}

	return 0;
}

/*
 * FE dai link trigger actions are always executed in non-atomic context because
 * they involve IPC's.
 */
static int sof_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	struct sof_ipc_stream stream;
	struct sof_ipc_reply reply;
	bool reset_hw_params = false;
	bool ipc_first = false;
	int ret;

	/* nothing to do for BE */
	if (rtd->dai_link->no_pcm)
		return 0;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	dev_dbg(sdev->dev, "pcm: trigger stream %d dir %d cmd %d\n",
		spcm->pcm.pcm_id, substream->stream, cmd);

	stream.hdr.size = sizeof(stream);
	stream.hdr.cmd = SOF_IPC_GLB_STREAM_MSG;
	stream.comp_id = spcm->stream[substream->stream].comp_id;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_PAUSE;
		ipc_first = true;
		break;
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_RELEASE;
		break;
	case SNDRV_PCM_TRIGGER_RESUME:
		/* set up hw_params */
		ret = sof_pcm_prepare(substream);
		if (ret < 0) {
			dev_err(sdev->dev,
				"error: failed to set up hw_params upon resume\n");
			return ret;
		}

		/* fallthrough */
	case SNDRV_PCM_TRIGGER_START:
		stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_START;
		break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
		stream.hdr.cmd |= SOF_IPC_STREAM_TRIG_STOP;
		ipc_first = true;
		reset_hw_params = true;
		break;
	default:
		dev_err(sdev->dev, "error: unhandled trigger cmd %d\n", cmd);
		return -EINVAL;
	}

	/*
	 * DMA and IPC sequence is different for start and stop. Need to send
	 * STOP IPC before stop DMA
	 */
	if (!ipc_first)
		snd_sof_pcm_platform_trigger(sdev, substream, cmd);

	/* send IPC to the DSP */
	ret = sof_ipc_tx_message(sdev->ipc, stream.hdr.cmd, &stream,
				 sizeof(stream), &reply, sizeof(reply));

	/* need to STOP DMA even if STOP IPC failed */
	if (ipc_first)
		snd_sof_pcm_platform_trigger(sdev, substream, cmd);

	/* free PCM if reset_hw_params is set and the STOP IPC is successful */
	if (!ret && reset_hw_params)
		ret = sof_pcm_dsp_pcm_free(substream, sdev, spcm);

	return ret;
}

static snd_pcm_uframes_t sof_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	snd_pcm_uframes_t host, dai;

	/* nothing to do for BE */
	if (rtd->dai_link->no_pcm)
		return 0;

	/* use dsp ops pointer callback directly if set */
	if (sof_ops(sdev)->pcm_pointer)
		return sof_ops(sdev)->pcm_pointer(sdev, substream);

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	/* read position from DSP */
	host = bytes_to_frames(substream->runtime,
			       spcm->stream[substream->stream].posn.host_posn);
	dai = bytes_to_frames(substream->runtime,
			      spcm->stream[substream->stream].posn.dai_posn);

	dev_dbg(sdev->dev, "PCM: stream %d dir %d DMA position %lu DAI position %lu\n",
		spcm->pcm.pcm_id, substream->stream, host, dai);

	return host;
}

static int sof_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	struct snd_soc_tplg_stream_caps *caps;
	int ret;

	/* nothing to do for BE */
	if (rtd->dai_link->no_pcm)
		return 0;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	dev_dbg(sdev->dev, "pcm: open stream %d dir %d\n", spcm->pcm.pcm_id,
		substream->stream);

	INIT_WORK(&spcm->stream[substream->stream].period_elapsed_work,
		  sof_pcm_period_elapsed_work);

	caps = &spcm->pcm.caps[substream->stream];

	/* set any runtime constraints based on topology */
	snd_pcm_hw_constraint_step(substream->runtime, 0,
				   SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
				   le32_to_cpu(caps->period_size_min));
	snd_pcm_hw_constraint_step(substream->runtime, 0,
				   SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
				   le32_to_cpu(caps->period_size_min));

	/* set runtime config */
	runtime->hw.info = SNDRV_PCM_INFO_MMAP |
			  SNDRV_PCM_INFO_MMAP_VALID |
			  SNDRV_PCM_INFO_INTERLEAVED |
			  SNDRV_PCM_INFO_PAUSE |
			  SNDRV_PCM_INFO_NO_PERIOD_WAKEUP;
	runtime->hw.formats = le64_to_cpu(caps->formats);
	runtime->hw.period_bytes_min = le32_to_cpu(caps->period_size_min);
	runtime->hw.period_bytes_max = le32_to_cpu(caps->period_size_max);
	runtime->hw.periods_min = le32_to_cpu(caps->periods_min);
	runtime->hw.periods_max = le32_to_cpu(caps->periods_max);

	/*
	 * caps->buffer_size_min is not used since the
	 * snd_pcm_hardware structure only defines buffer_bytes_max
	 */
	runtime->hw.buffer_bytes_max = le32_to_cpu(caps->buffer_size_max);

	dev_dbg(sdev->dev, "period min %zd max %zd bytes\n",
		runtime->hw.period_bytes_min,
		runtime->hw.period_bytes_max);
	dev_dbg(sdev->dev, "period count %d max %d\n",
		runtime->hw.periods_min,
		runtime->hw.periods_max);
	dev_dbg(sdev->dev, "buffer max %zd bytes\n",
		runtime->hw.buffer_bytes_max);

	/* set wait time - TODO: come from topology */
	substream->wait_time = 500;

	spcm->stream[substream->stream].posn.host_posn = 0;
	spcm->stream[substream->stream].posn.dai_posn = 0;
	spcm->stream[substream->stream].substream = substream;
	spcm->prepared[substream->stream] = false;

	ret = snd_sof_pcm_platform_open(sdev, substream);
	if (ret < 0)
		dev_err(sdev->dev, "error: pcm open failed %d\n", ret);

	return ret;
}

static int sof_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	int err;

	/* nothing to do for BE */
	if (rtd->dai_link->no_pcm)
		return 0;

	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm)
		return -EINVAL;

	dev_dbg(sdev->dev, "pcm: close stream %d dir %d\n", spcm->pcm.pcm_id,
		substream->stream);

	err = snd_sof_pcm_platform_close(sdev, substream);
	if (err < 0) {
		dev_err(sdev->dev, "error: pcm close failed %d\n",
			err);
		/*
		 * keep going, no point in preventing the close
		 * from happening
		 */
	}

	return 0;
}

static struct snd_pcm_ops sof_pcm_ops = {
	.open		= sof_pcm_open,
	.close		= sof_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= sof_pcm_hw_params,
	.prepare	= sof_pcm_prepare,
	.hw_free	= sof_pcm_hw_free,
	.trigger	= sof_pcm_trigger,
	.pointer	= sof_pcm_pointer,
	.page		= snd_pcm_sgbuf_ops_page,
};

/*
 * Pre-allocate playback/capture audio buffer pages.
 * no need to explicitly release memory preallocated by sof_pcm_new in pcm_free
 * snd_pcm_lib_preallocate_free_for_all() is called by the core.
 */
static int sof_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pcm *spcm;
	struct snd_pcm *pcm = rtd->pcm;
	struct snd_soc_tplg_stream_caps *caps;
	int stream = SNDRV_PCM_STREAM_PLAYBACK;

	/* find SOF PCM for this RTD */
	spcm = snd_sof_find_spcm_dai(sdev, rtd);
	if (!spcm) {
		dev_warn(sdev->dev, "warn: can't find PCM with DAI ID %d\n",
			 rtd->dai_link->id);
		return 0;
	}

	dev_dbg(sdev->dev, "creating new PCM %s\n", spcm->pcm.pcm_name);

	/* do we need to pre-allocate playback audio buffer pages */
	if (!spcm->pcm.playback)
		goto capture;

	caps = &spcm->pcm.caps[stream];

	/* pre-allocate playback audio buffer pages */
	dev_dbg(sdev->dev, "spcm: allocate %s playback DMA buffer size 0x%x max 0x%x\n",
		caps->name, caps->buffer_size_min, caps->buffer_size_max);

	snd_pcm_lib_preallocate_pages(pcm->streams[stream].substream,
				      SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
				      le32_to_cpu(caps->buffer_size_min),
				      le32_to_cpu(caps->buffer_size_max));
capture:
	stream = SNDRV_PCM_STREAM_CAPTURE;

	/* do we need to pre-allocate capture audio buffer pages */
	if (!spcm->pcm.capture)
		return 0;

	caps = &spcm->pcm.caps[stream];

	/* pre-allocate capture audio buffer pages */
	dev_dbg(sdev->dev, "spcm: allocate %s capture DMA buffer size 0x%x max 0x%x\n",
		caps->name, caps->buffer_size_min, caps->buffer_size_max);

	snd_pcm_lib_preallocate_pages(pcm->streams[stream].substream,
				      SNDRV_DMA_TYPE_DEV_SG, sdev->dev,
				      le32_to_cpu(caps->buffer_size_min),
				      le32_to_cpu(caps->buffer_size_max));

	return 0;
}

/* fixup the BE DAI link to match any values from topology */
static int sof_pcm_dai_link_fixup(struct snd_soc_pcm_runtime *rtd,
				  struct snd_pcm_hw_params *params)
{
	struct snd_interval *rate = hw_param_interval(params,
			SNDRV_PCM_HW_PARAM_RATE);
	struct snd_interval *channels = hw_param_interval(params,
						SNDRV_PCM_HW_PARAM_CHANNELS);
	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
	struct snd_soc_component *component =
		snd_soc_rtdcom_lookup(rtd, DRV_NAME);
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_dai *dai =
		snd_sof_find_dai(sdev, (char *)rtd->dai_link->name);

	/* no topology exists for this BE, try a common configuration */
	if (!dai) {
		dev_warn(sdev->dev, "warning: no topology found for BE DAI %s config\n",
			 rtd->dai_link->name);

		/*  set 48k, stereo, 16bits by default */
		rate->min = 48000;
		rate->max = 48000;

		channels->min = 2;
		channels->max = 2;

		snd_mask_none(fmt);
		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);

		return 0;
	}

	/* read format from topology */
	snd_mask_none(fmt);

	switch (dai->comp_dai.config.frame_fmt) {
	case SOF_IPC_FRAME_S16_LE:
		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
		break;
	case SOF_IPC_FRAME_S24_4LE:
		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S24_LE);
		break;
	case SOF_IPC_FRAME_S32_LE:
		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S32_LE);
		break;
	default:
		dev_err(sdev->dev, "error: No available DAI format!\n");
		return -EINVAL;
	}

	/* read rate and channels from topology */
	switch (dai->dai_config->type) {
	case SOF_DAI_INTEL_SSP:
		rate->min = dai->dai_config->ssp.fsync_rate;
		rate->max = dai->dai_config->ssp.fsync_rate;
		channels->min = dai->dai_config->ssp.tdm_slots;
		channels->max = dai->dai_config->ssp.tdm_slots;

		dev_dbg(sdev->dev,
			"rate_min: %d rate_max: %d\n", rate->min, rate->max);
		dev_dbg(sdev->dev,
			"channels_min: %d channels_max: %d\n",
			channels->min, channels->max);

		break;
	case SOF_DAI_INTEL_DMIC:
		/* DMIC only supports 16 or 32 bit formats */
		if (dai->comp_dai.config.frame_fmt == SOF_IPC_FRAME_S24_4LE) {
			dev_err(sdev->dev,
				"error: invalid fmt %d for DAI type %d\n",
				dai->comp_dai.config.frame_fmt,
				dai->dai_config->type);
		}
		break;
	case SOF_DAI_INTEL_HDA:
		/* do nothing for HDA dai_link */
		break;
	case SOF_DAI_INTEL_ALH:
		/* do nothing for ALH dai_link */
		break;
	default:
		dev_err(sdev->dev, "error: invalid DAI type %d\n",
			dai->dai_config->type);
		break;
	}

	return 0;
}

static int sof_pcm_probe(struct snd_soc_component *component)
{
	struct snd_sof_dev *sdev = snd_soc_component_get_drvdata(component);
	struct snd_sof_pdata *plat_data = sdev->pdata;
	const char *tplg_filename;
	int ret;

	/* load the default topology */
	sdev->component = component;

	tplg_filename = devm_kasprintf(sdev->dev, GFP_KERNEL,
				       "%s/%s",
				       plat_data->tplg_filename_prefix,
				       plat_data->tplg_filename);
	if (!tplg_filename)
		return -ENOMEM;

	ret = snd_sof_load_topology(sdev, tplg_filename);
	if (ret < 0) {
		dev_err(sdev->dev, "error: failed to load DSP topology %d\n",
			ret);
		return ret;
	}

	/*
	 * Some platforms in SOF, ex: BYT, may not have their platform PM
	 * callbacks set. Increment the usage count so as to
	 * prevent the device from entering runtime suspend.
	 */
	if (!sof_ops(sdev)->runtime_suspend || !sof_ops(sdev)->runtime_resume)
		pm_runtime_get_noresume(sdev->dev);

	return ret;
}

static void sof_pcm_remove(struct snd_soc_component *component)
{
	/* remove topology */
	snd_soc_tplg_component_remove(component, SND_SOC_TPLG_INDEX_ALL);
}

void snd_sof_new_platform_drv(struct snd_sof_dev *sdev)
{
	struct snd_soc_component_driver *pd = &sdev->plat_drv;
	struct snd_sof_pdata *plat_data = sdev->pdata;
	const char *drv_name;

	drv_name = plat_data->machine->drv_name;

	pd->name = "sof-audio-component";
	pd->probe = sof_pcm_probe;
	pd->remove = sof_pcm_remove;
	pd->ops	= &sof_pcm_ops;
#if IS_ENABLED(CONFIG_SND_SOC_SOF_COMPRESS)
	pd->compr_ops = &sof_compressed_ops;
#endif
	pd->pcm_new = sof_pcm_new;
	pd->ignore_machine = drv_name;
	pd->be_hw_params_fixup = sof_pcm_dai_link_fixup;
	pd->be_pcm_base = SOF_BE_PCM_BASE;
	pd->use_dai_pcm_id = true;
	pd->topology_name_prefix = "sof";

	 /* increment module refcount when a pcm is opened */
	pd->module_get_upon_open = 1;
}