summaryrefslogtreecommitdiffstats
path: root/sound/soc/sh/rcar/core.c
blob: d836e8a9fdce38fc559a0a7d91c2dc0d2e13eb43 (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
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
/*
 * Renesas R-Car SRU/SCU/SSIU/SSI support
 *
 * Copyright (C) 2013 Renesas Solutions Corp.
 * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * Based on fsi.c
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/*
 * Renesas R-Car sound device structure
 *
 * Gen1
 *
 * SRU		: Sound Routing Unit
 *  - SRC	: Sampling Rate Converter
 *  - CMD
 *    - CTU	: Channel Count Conversion Unit
 *    - MIX	: Mixer
 *    - DVC	: Digital Volume and Mute Function
 *  - SSI	: Serial Sound Interface
 *
 * Gen2
 *
 * SCU		: Sampling Rate Converter Unit
 *  - SRC	: Sampling Rate Converter
 *  - CMD
 *   - CTU	: Channel Count Conversion Unit
 *   - MIX	: Mixer
 *   - DVC	: Digital Volume and Mute Function
 * SSIU		: Serial Sound Interface Unit
 *  - SSI	: Serial Sound Interface
 */

/*
 *	driver data Image
 *
 * rsnd_priv
 *   |
 *   | ** this depends on Gen1/Gen2
 *   |
 *   +- gen
 *   |
 *   | ** these depend on data path
 *   | ** gen and platform data control it
 *   |
 *   +- rdai[0]
 *   |   |		 sru     ssiu      ssi
 *   |   +- playback -> [mod] -> [mod] -> [mod] -> ...
 *   |   |
 *   |   |		 sru     ssiu      ssi
 *   |   +- capture  -> [mod] -> [mod] -> [mod] -> ...
 *   |
 *   +- rdai[1]
 *   |   |		 sru     ssiu      ssi
 *   |   +- playback -> [mod] -> [mod] -> [mod] -> ...
 *   |   |
 *   |   |		 sru     ssiu      ssi
 *   |   +- capture  -> [mod] -> [mod] -> [mod] -> ...
 *   ...
 *   |
 *   | ** these control ssi
 *   |
 *   +- ssi
 *   |  |
 *   |  +- ssi[0]
 *   |  +- ssi[1]
 *   |  +- ssi[2]
 *   |  ...
 *   |
 *   | ** these control src
 *   |
 *   +- src
 *      |
 *      +- src[0]
 *      +- src[1]
 *      +- src[2]
 *      ...
 *
 *
 * for_each_rsnd_dai(xx, priv, xx)
 *  rdai[0] => rdai[1] => rdai[2] => ...
 *
 * for_each_rsnd_mod(xx, rdai, xx)
 *  [mod] => [mod] => [mod] => ...
 *
 * rsnd_dai_call(xxx, fn )
 *  [mod]->fn() -> [mod]->fn() -> [mod]->fn()...
 *
 */
#include <linux/pm_runtime.h>
#include <linux/shdma-base.h>
#include "rsnd.h"

#define RSND_RATES SNDRV_PCM_RATE_8000_96000
#define RSND_FMTS (SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S16_LE)

/*
 *	rsnd_platform functions
 */
#define rsnd_platform_call(priv, dai, func, param...)	\
	(!(priv->info->func) ? 0 :		\
	 priv->info->func(param))

#define rsnd_is_enable_path(io, name) \
	((io)->info ? (io)->info->name : NULL)
#define rsnd_info_id(priv, io, name) \
	((io)->info->name - priv->info->name##_info)

/*
 *	rsnd_mod functions
 */
char *rsnd_mod_name(struct rsnd_mod *mod)
{
	if (!mod || !mod->ops)
		return "unknown";

	return mod->ops->name;
}

void rsnd_mod_init(struct rsnd_priv *priv,
		   struct rsnd_mod *mod,
		   struct rsnd_mod_ops *ops,
		   enum rsnd_mod_type type,
		   int id)
{
	mod->priv	= priv;
	mod->id		= id;
	mod->ops	= ops;
	mod->type	= type;
}

/*
 *	rsnd_dma functions
 */
static void __rsnd_dma_start(struct rsnd_dma *dma);
static void rsnd_dma_continue(struct rsnd_dma *dma)
{
	/* push next A or B plane */
	dma->submit_loop = 1;
	schedule_work(&dma->work);
}

void rsnd_dma_start(struct rsnd_dma *dma)
{
	/* push both A and B plane*/
	dma->offset = 0;
	dma->submit_loop = 2;
	__rsnd_dma_start(dma);
}

void rsnd_dma_stop(struct rsnd_dma *dma)
{
	dma->submit_loop = 0;
	cancel_work_sync(&dma->work);
	dmaengine_terminate_all(dma->chan);
}

static void rsnd_dma_complete(void *data)
{
	struct rsnd_dma *dma = (struct rsnd_dma *)data;
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(rsnd_dma_to_mod(dma));
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	unsigned long flags;

	rsnd_lock(priv, flags);

	/*
	 * Renesas sound Gen1 needs 1 DMAC,
	 * Gen2 needs 2 DMAC.
	 * In Gen2 case, it are Audio-DMAC, and Audio-DMAC-peri-peri.
	 * But, Audio-DMAC-peri-peri doesn't have interrupt,
	 * and this driver is assuming that here.
	 *
	 * If Audio-DMAC-peri-peri has interrpt,
	 * rsnd_dai_pointer_update() will be called twice,
	 * ant it will breaks io->byte_pos
	 */

	rsnd_dai_pointer_update(io, io->byte_per_period);

	if (dma->submit_loop)
		rsnd_dma_continue(dma);

	rsnd_unlock(priv, flags);
}

static void __rsnd_dma_start(struct rsnd_dma *dma)
{
	struct rsnd_mod *mod = rsnd_dma_to_mod(dma);
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
	struct rsnd_dai_stream *io = rsnd_mod_to_io(mod);
	struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
	struct device *dev = rsnd_priv_to_dev(priv);
	struct dma_async_tx_descriptor *desc;
	dma_addr_t buf;
	size_t len = io->byte_per_period;
	int i;

	for (i = 0; i < dma->submit_loop; i++) {

		buf = runtime->dma_addr +
			rsnd_dai_pointer_offset(io, dma->offset + len);
		dma->offset = len;

		desc = dmaengine_prep_slave_single(
			dma->chan, buf, len, dma->dir,
			DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
		if (!desc) {
			dev_err(dev, "dmaengine_prep_slave_sg() fail\n");
			return;
		}

		desc->callback		= rsnd_dma_complete;
		desc->callback_param	= dma;

		if (dmaengine_submit(desc) < 0) {
			dev_err(dev, "dmaengine_submit() fail\n");
			return;
		}

		dma_async_issue_pending(dma->chan);
	}
}

static void rsnd_dma_do_work(struct work_struct *work)
{
	struct rsnd_dma *dma = container_of(work, struct rsnd_dma, work);

	__rsnd_dma_start(dma);
}

int rsnd_dma_available(struct rsnd_dma *dma)
{
	return !!dma->chan;
}

int rsnd_dma_init(struct rsnd_priv *priv, struct rsnd_dma *dma,
		  int is_play, int id)
{
	struct device *dev = rsnd_priv_to_dev(priv);
	struct dma_slave_config cfg;
	dma_cap_mask_t mask;
	int ret;

	if (dma->chan) {
		dev_err(dev, "it already has dma channel\n");
		return -EIO;
	}

	dma_cap_zero(mask);
	dma_cap_set(DMA_SLAVE, mask);

	dma->chan = dma_request_slave_channel_compat(mask, shdma_chan_filter,
						     (void *)id, dev,
						     is_play ? "tx" : "rx");
	if (!dma->chan) {
		dev_err(dev, "can't get dma channel\n");
		return -EIO;
	}

	cfg.slave_id	= id;
	cfg.dst_addr	= 0; /* use default addr when playback */
	cfg.src_addr	= 0; /* use default addr when capture */
	cfg.direction	= is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;

	ret = dmaengine_slave_config(dma->chan, &cfg);
	if (ret < 0)
		goto rsnd_dma_init_err;

	dma->dir = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
	INIT_WORK(&dma->work, rsnd_dma_do_work);

	return 0;

rsnd_dma_init_err:
	rsnd_dma_quit(priv, dma);

	return ret;
}

void  rsnd_dma_quit(struct rsnd_priv *priv,
		    struct rsnd_dma *dma)
{
	if (dma->chan)
		dma_release_channel(dma->chan);

	dma->chan = NULL;
}

/*
 *	rsnd_dai functions
 */
#define __rsnd_mod_call(mod, func, rdai, io)			\
({								\
	struct rsnd_priv *priv = rsnd_mod_to_priv(mod);		\
	struct device *dev = rsnd_priv_to_dev(priv);		\
	dev_dbg(dev, "%s [%d] %s\n",				\
		rsnd_mod_name(mod), rsnd_mod_id(mod), #func);	\
	(mod)->ops->func(mod, rdai, io);			\
})

#define rsnd_mod_call(mod, func, rdai, io)	\
	(!(mod) ? -ENODEV :			\
	 !((mod)->ops->func) ? 0 :		\
	 __rsnd_mod_call(mod, func, (rdai), (io)))

#define rsnd_dai_call(rdai, io, fn)				\
({								\
	struct rsnd_mod *mod;					\
	int ret = 0, i;						\
	for (i = 0; i < RSND_MOD_MAX; i++) {			\
		mod = (io)->mod[i];				\
		if (!mod)					\
			continue;				\
		ret = rsnd_mod_call(mod, fn, (rdai), (io));	\
		if (ret < 0)					\
			break;					\
	}							\
	ret;							\
})

static int rsnd_dai_connect(struct rsnd_mod *mod,
			    struct rsnd_dai_stream *io)
{
	if (!mod)
		return -EIO;

	if (io->mod[mod->type]) {
		struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
		struct device *dev = rsnd_priv_to_dev(priv);

		dev_err(dev, "%s%d is not empty\n",
			rsnd_mod_name(mod),
			rsnd_mod_id(mod));
		return -EIO;
	}

	io->mod[mod->type] = mod;
	mod->io = io;

	return 0;
}

int rsnd_dai_id(struct rsnd_priv *priv, struct rsnd_dai *rdai)
{
	int id = rdai - priv->rdai;

	if ((id < 0) || (id >= rsnd_rdai_nr(priv)))
		return -EINVAL;

	return id;
}

struct rsnd_dai *rsnd_dai_get(struct rsnd_priv *priv, int id)
{
	if ((id < 0) || (id >= rsnd_rdai_nr(priv)))
		return NULL;

	return priv->rdai + id;
}

static struct rsnd_dai *rsnd_dai_to_rdai(struct snd_soc_dai *dai)
{
	struct rsnd_priv *priv = snd_soc_dai_get_drvdata(dai);

	return rsnd_dai_get(priv, dai->id);
}

int rsnd_dai_is_play(struct rsnd_dai *rdai, struct rsnd_dai_stream *io)
{
	return &rdai->playback == io;
}

/*
 *	rsnd_soc_dai functions
 */
int rsnd_dai_pointer_offset(struct rsnd_dai_stream *io, int additional)
{
	struct snd_pcm_substream *substream = io->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	int pos = io->byte_pos + additional;

	pos %= (runtime->periods * io->byte_per_period);

	return pos;
}

void rsnd_dai_pointer_update(struct rsnd_dai_stream *io, int byte)
{
	io->byte_pos += byte;

	if (io->byte_pos >= io->next_period_byte) {
		struct snd_pcm_substream *substream = io->substream;
		struct snd_pcm_runtime *runtime = substream->runtime;

		io->period_pos++;
		io->next_period_byte += io->byte_per_period;

		if (io->period_pos >= runtime->periods) {
			io->byte_pos = 0;
			io->period_pos = 0;
			io->next_period_byte = io->byte_per_period;
		}

		snd_pcm_period_elapsed(substream);
	}
}

static int rsnd_dai_stream_init(struct rsnd_dai_stream *io,
				struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;

	io->substream		= substream;
	io->byte_pos		= 0;
	io->period_pos		= 0;
	io->byte_per_period	= runtime->period_size *
				  runtime->channels *
				  samples_to_bytes(runtime, 1);
	io->next_period_byte	= io->byte_per_period;

	return 0;
}

static
struct snd_soc_dai *rsnd_substream_to_dai(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;

	return  rtd->cpu_dai;
}

static
struct rsnd_dai_stream *rsnd_rdai_to_io(struct rsnd_dai *rdai,
					struct snd_pcm_substream *substream)
{
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		return &rdai->playback;
	else
		return &rdai->capture;
}

static int rsnd_soc_dai_trigger(struct snd_pcm_substream *substream, int cmd,
			    struct snd_soc_dai *dai)
{
	struct rsnd_priv *priv = snd_soc_dai_get_drvdata(dai);
	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
	struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);
	struct rsnd_mod *mod = rsnd_ssi_mod_get_frm_dai(priv,
						rsnd_dai_id(priv, rdai),
						rsnd_dai_is_play(rdai, io));
	int ssi_id = rsnd_mod_id(mod);
	int ret;
	unsigned long flags;

	rsnd_lock(priv, flags);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		ret = rsnd_dai_stream_init(io, substream);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_platform_call(priv, dai, start, ssi_id);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_dai_call(rdai, io, init);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_dai_call(rdai, io, start);
		if (ret < 0)
			goto dai_trigger_end;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		ret = rsnd_dai_call(rdai, io, stop);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_dai_call(rdai, io, quit);
		if (ret < 0)
			goto dai_trigger_end;

		ret = rsnd_platform_call(priv, dai, stop, ssi_id);
		if (ret < 0)
			goto dai_trigger_end;
		break;
	default:
		ret = -EINVAL;
	}

dai_trigger_end:
	rsnd_unlock(priv, flags);

	return ret;
}

static int rsnd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		rdai->clk_master = 0;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		rdai->clk_master = 1; /* codec is slave, cpu is master */
		break;
	default:
		return -EINVAL;
	}

	/* set clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_IF:
		rdai->bit_clk_inv = 0;
		rdai->frm_clk_inv = 1;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		rdai->bit_clk_inv = 1;
		rdai->frm_clk_inv = 0;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		rdai->bit_clk_inv = 1;
		rdai->frm_clk_inv = 1;
		break;
	case SND_SOC_DAIFMT_NB_NF:
	default:
		rdai->bit_clk_inv = 0;
		rdai->frm_clk_inv = 0;
		break;
	}

	/* set format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		rdai->sys_delay = 0;
		rdai->data_alignment = 0;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		rdai->sys_delay = 1;
		rdai->data_alignment = 0;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		rdai->sys_delay = 1;
		rdai->data_alignment = 1;
		break;
	}

	return 0;
}

static const struct snd_soc_dai_ops rsnd_soc_dai_ops = {
	.trigger	= rsnd_soc_dai_trigger,
	.set_fmt	= rsnd_soc_dai_set_fmt,
};

static int rsnd_path_init(struct rsnd_priv *priv,
			  struct rsnd_dai *rdai,
			  struct rsnd_dai_stream *io)
{
	struct rsnd_mod *mod;
	struct rsnd_dai_platform_info *dai_info = rdai->info;
	int ret;
	int ssi_id = -1;
	int src_id = -1;

	/*
	 * Gen1 is created by SRU/SSI, and this SRU is base module of
	 * Gen2's SCU/SSIU/SSI. (Gen2 SCU/SSIU came from SRU)
	 *
	 * Easy image is..
	 *	Gen1 SRU = Gen2 SCU + SSIU + etc
	 *
	 * Gen2 SCU path is very flexible, but, Gen1 SRU (SCU parts) is
	 * using fixed path.
	 */
	if (dai_info) {
		if (rsnd_is_enable_path(io, ssi))
			ssi_id = rsnd_info_id(priv, io, ssi);
		if (rsnd_is_enable_path(io, src))
			src_id = rsnd_info_id(priv, io, src);
	} else {
		/* get SSI's ID */
		mod = rsnd_ssi_mod_get_frm_dai(priv,
					       rsnd_dai_id(priv, rdai),
					       rsnd_dai_is_play(rdai, io));
		if (!mod)
			return 0;
		ssi_id = src_id = rsnd_mod_id(mod);
	}

	ret = 0;

	/* SRC */
	if (src_id >= 0) {
		mod = rsnd_src_mod_get(priv, src_id);
		ret = rsnd_dai_connect(mod, io);
		if (ret < 0)
			return ret;
	}

	/* SSI */
	if (ssi_id >= 0) {
		mod = rsnd_ssi_mod_get(priv, ssi_id);
		ret = rsnd_dai_connect(mod, io);
		if (ret < 0)
			return ret;
	}

	return ret;
}

static int rsnd_dai_probe(struct platform_device *pdev,
			  struct rsnd_priv *priv)
{
	struct snd_soc_dai_driver *drv;
	struct rcar_snd_info *info = rsnd_priv_to_info(priv);
	struct rsnd_dai *rdai;
	struct rsnd_mod *pmod, *cmod;
	struct device *dev = rsnd_priv_to_dev(priv);
	int dai_nr = info->dai_info_nr;
	int i;

	/*
	 * dai_nr should be set via dai_info_nr,
	 * but allow it to keeping compatible
	 */
	if (!dai_nr) {
		/* get max dai nr */
		for (dai_nr = 0; dai_nr < 32; dai_nr++) {
			pmod = rsnd_ssi_mod_get_frm_dai(priv, dai_nr, 1);
			cmod = rsnd_ssi_mod_get_frm_dai(priv, dai_nr, 0);

			if (!pmod && !cmod)
				break;
		}
	}

	if (!dai_nr) {
		dev_err(dev, "no dai\n");
		return -EIO;
	}

	drv  = devm_kzalloc(dev, sizeof(*drv)  * dai_nr, GFP_KERNEL);
	rdai = devm_kzalloc(dev, sizeof(*rdai) * dai_nr, GFP_KERNEL);
	if (!drv || !rdai) {
		dev_err(dev, "dai allocate failed\n");
		return -ENOMEM;
	}

	priv->rdai_nr	= dai_nr;
	priv->daidrv	= drv;
	priv->rdai	= rdai;

	for (i = 0; i < dai_nr; i++) {
		if (info->dai_info)
			rdai[i].info = &info->dai_info[i];

		pmod = rsnd_ssi_mod_get_frm_dai(priv, i, 1);
		cmod = rsnd_ssi_mod_get_frm_dai(priv, i, 0);

		/*
		 *	init rsnd_dai
		 */
		snprintf(rdai[i].name, RSND_DAI_NAME_SIZE, "rsnd-dai.%d", i);

		/*
		 *	init snd_soc_dai_driver
		 */
		drv[i].name	= rdai[i].name;
		drv[i].ops	= &rsnd_soc_dai_ops;
		if (pmod) {
			drv[i].playback.rates		= RSND_RATES;
			drv[i].playback.formats		= RSND_FMTS;
			drv[i].playback.channels_min	= 2;
			drv[i].playback.channels_max	= 2;

			if (info->dai_info)
				rdai[i].playback.info = &info->dai_info[i].playback;
			rsnd_path_init(priv, &rdai[i], &rdai[i].playback);
		}
		if (cmod) {
			drv[i].capture.rates		= RSND_RATES;
			drv[i].capture.formats		= RSND_FMTS;
			drv[i].capture.channels_min	= 2;
			drv[i].capture.channels_max	= 2;

			if (info->dai_info)
				rdai[i].capture.info = &info->dai_info[i].capture;
			rsnd_path_init(priv, &rdai[i], &rdai[i].capture);
		}

		dev_dbg(dev, "%s (%s/%s)\n", rdai[i].name,
			pmod ? "play"    : " -- ",
			cmod ? "capture" : "  --   ");
	}

	return 0;
}

/*
 *		pcm ops
 */
static struct snd_pcm_hardware rsnd_pcm_hardware = {
	.info =		SNDRV_PCM_INFO_INTERLEAVED	|
			SNDRV_PCM_INFO_MMAP		|
			SNDRV_PCM_INFO_MMAP_VALID	|
			SNDRV_PCM_INFO_PAUSE,
	.buffer_bytes_max	= 64 * 1024,
	.period_bytes_min	= 32,
	.period_bytes_max	= 8192,
	.periods_min		= 1,
	.periods_max		= 32,
	.fifo_size		= 256,
};

static int rsnd_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	int ret = 0;

	snd_soc_set_runtime_hwparams(substream, &rsnd_pcm_hardware);

	ret = snd_pcm_hw_constraint_integer(runtime,
					    SNDRV_PCM_HW_PARAM_PERIODS);

	return ret;
}

static int rsnd_hw_params(struct snd_pcm_substream *substream,
			 struct snd_pcm_hw_params *hw_params)
{
	return snd_pcm_lib_malloc_pages(substream,
					params_buffer_bytes(hw_params));
}

static snd_pcm_uframes_t rsnd_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_dai *dai = rsnd_substream_to_dai(substream);
	struct rsnd_dai *rdai = rsnd_dai_to_rdai(dai);
	struct rsnd_dai_stream *io = rsnd_rdai_to_io(rdai, substream);

	return bytes_to_frames(runtime, io->byte_pos);
}

static struct snd_pcm_ops rsnd_pcm_ops = {
	.open		= rsnd_pcm_open,
	.ioctl		= snd_pcm_lib_ioctl,
	.hw_params	= rsnd_hw_params,
	.hw_free	= snd_pcm_lib_free_pages,
	.pointer	= rsnd_pointer,
};

/*
 *		snd_soc_platform
 */

#define PREALLOC_BUFFER		(32 * 1024)
#define PREALLOC_BUFFER_MAX	(32 * 1024)

static int rsnd_pcm_new(struct snd_soc_pcm_runtime *rtd)
{
	return snd_pcm_lib_preallocate_pages_for_all(
		rtd->pcm,
		SNDRV_DMA_TYPE_DEV,
		rtd->card->snd_card->dev,
		PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
}

static void rsnd_pcm_free(struct snd_pcm *pcm)
{
	snd_pcm_lib_preallocate_free_for_all(pcm);
}

static struct snd_soc_platform_driver rsnd_soc_platform = {
	.ops		= &rsnd_pcm_ops,
	.pcm_new	= rsnd_pcm_new,
	.pcm_free	= rsnd_pcm_free,
};

static const struct snd_soc_component_driver rsnd_soc_component = {
	.name		= "rsnd",
};

/*
 *	rsnd probe
 */
static int rsnd_probe(struct platform_device *pdev)
{
	struct rcar_snd_info *info;
	struct rsnd_priv *priv;
	struct device *dev = &pdev->dev;
	struct rsnd_dai *rdai;
	int (*probe_func[])(struct platform_device *pdev,
			    struct rsnd_priv *priv) = {
		rsnd_gen_probe,
		rsnd_ssi_probe,
		rsnd_src_probe,
		rsnd_adg_probe,
		rsnd_dai_probe,
	};
	int ret, i;

	info = pdev->dev.platform_data;
	if (!info) {
		dev_err(dev, "driver needs R-Car sound information\n");
		return -ENODEV;
	}

	/*
	 *	init priv data
	 */
	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		dev_err(dev, "priv allocate failed\n");
		return -ENODEV;
	}

	priv->dev	= dev;
	priv->info	= info;
	spin_lock_init(&priv->lock);

	/*
	 *	init each module
	 */
	for (i = 0; i < ARRAY_SIZE(probe_func); i++) {
		ret = probe_func[i](pdev, priv);
		if (ret)
			return ret;
	}

	for_each_rsnd_dai(rdai, priv, i) {
		ret = rsnd_dai_call(rdai, &rdai->playback, probe);
		if (ret)
			return ret;

		ret = rsnd_dai_call(rdai, &rdai->capture, probe);
		if (ret)
			return ret;
	}

	/*
	 *	asoc register
	 */
	ret = snd_soc_register_platform(dev, &rsnd_soc_platform);
	if (ret < 0) {
		dev_err(dev, "cannot snd soc register\n");
		return ret;
	}

	ret = snd_soc_register_component(dev, &rsnd_soc_component,
					 priv->daidrv, rsnd_rdai_nr(priv));
	if (ret < 0) {
		dev_err(dev, "cannot snd dai register\n");
		goto exit_snd_soc;
	}

	dev_set_drvdata(dev, priv);

	pm_runtime_enable(dev);

	dev_info(dev, "probed\n");
	return ret;

exit_snd_soc:
	snd_soc_unregister_platform(dev);

	return ret;
}

static int rsnd_remove(struct platform_device *pdev)
{
	struct rsnd_priv *priv = dev_get_drvdata(&pdev->dev);
	struct rsnd_dai *rdai;
	int ret, i;

	pm_runtime_disable(&pdev->dev);

	for_each_rsnd_dai(rdai, priv, i) {
		ret = rsnd_dai_call(rdai, &rdai->playback, remove);
		if (ret)
			return ret;

		ret = rsnd_dai_call(rdai, &rdai->capture, remove);
		if (ret)
			return ret;
	}

	return 0;
}

static struct platform_driver rsnd_driver = {
	.driver	= {
		.name	= "rcar_sound",
	},
	.probe		= rsnd_probe,
	.remove		= rsnd_remove,
};
module_platform_driver(rsnd_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Renesas R-Car audio driver");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
MODULE_ALIAS("platform:rcar-pcm-audio");