summaryrefslogtreecommitdiffstats
path: root/sound/soc/fsl/fsl_esai.c
blob: 72d154e7dd03c3695860dd4da8b00fd6bc2ff3c5 (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
/*
 * Freescale ESAI ALSA SoC Digital Audio Interface (DAI) driver
 *
 * Copyright (C) 2014 Freescale Semiconductor, Inc.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>

#include "fsl_esai.h"
#include "imx-pcm.h"
#include "fsl_utils.h"

#define FSL_ESAI_RATES		SNDRV_PCM_RATE_8000_192000
#define FSL_ESAI_FORMATS	(SNDRV_PCM_FMTBIT_S8 | \
				SNDRV_PCM_FMTBIT_S16_LE | \
				SNDRV_PCM_FMTBIT_S20_3LE | \
				SNDRV_PCM_FMTBIT_S24_LE)

/**
 * fsl_esai: ESAI private data
 *
 * @dma_params_rx: DMA parameters for receive channel
 * @dma_params_tx: DMA parameters for transmit channel
 * @pdev: platform device pointer
 * @regmap: regmap handler
 * @coreclk: clock source to access register
 * @extalclk: esai clock source to derive HCK, SCK and FS
 * @fsysclk: system clock source to derive HCK, SCK and FS
 * @fifo_depth: depth of tx/rx FIFO
 * @slot_width: width of each DAI slot
 * @hck_rate: clock rate of desired HCKx clock
 * @sck_rate: clock rate of desired SCKx clock
 * @hck_dir: the direction of HCKx pads
 * @sck_div: if using PSR/PM dividers for SCKx clock
 * @slave_mode: if fully using DAI slave mode
 * @synchronous: if using tx/rx synchronous mode
 * @name: driver name
 */
struct fsl_esai {
	struct snd_dmaengine_dai_dma_data dma_params_rx;
	struct snd_dmaengine_dai_dma_data dma_params_tx;
	struct platform_device *pdev;
	struct regmap *regmap;
	struct clk *coreclk;
	struct clk *extalclk;
	struct clk *fsysclk;
	u32 fifo_depth;
	u32 slot_width;
	u32 hck_rate[2];
	u32 sck_rate[2];
	bool hck_dir[2];
	bool sck_div[2];
	bool slave_mode;
	bool synchronous;
	char name[32];
};

static irqreturn_t esai_isr(int irq, void *devid)
{
	struct fsl_esai *esai_priv = (struct fsl_esai *)devid;
	struct platform_device *pdev = esai_priv->pdev;
	u32 esr;

	regmap_read(esai_priv->regmap, REG_ESAI_ESR, &esr);

	if (esr & ESAI_ESR_TINIT_MASK)
		dev_dbg(&pdev->dev, "isr: Transmition Initialized\n");

	if (esr & ESAI_ESR_RFF_MASK)
		dev_warn(&pdev->dev, "isr: Receiving overrun\n");

	if (esr & ESAI_ESR_TFE_MASK)
		dev_warn(&pdev->dev, "isr: Transmition underrun\n");

	if (esr & ESAI_ESR_TLS_MASK)
		dev_dbg(&pdev->dev, "isr: Just transmitted the last slot\n");

	if (esr & ESAI_ESR_TDE_MASK)
		dev_dbg(&pdev->dev, "isr: Transmition data exception\n");

	if (esr & ESAI_ESR_TED_MASK)
		dev_dbg(&pdev->dev, "isr: Transmitting even slots\n");

	if (esr & ESAI_ESR_TD_MASK)
		dev_dbg(&pdev->dev, "isr: Transmitting data\n");

	if (esr & ESAI_ESR_RLS_MASK)
		dev_dbg(&pdev->dev, "isr: Just received the last slot\n");

	if (esr & ESAI_ESR_RDE_MASK)
		dev_dbg(&pdev->dev, "isr: Receiving data exception\n");

	if (esr & ESAI_ESR_RED_MASK)
		dev_dbg(&pdev->dev, "isr: Receiving even slots\n");

	if (esr & ESAI_ESR_RD_MASK)
		dev_dbg(&pdev->dev, "isr: Receiving data\n");

	return IRQ_HANDLED;
}

/**
 * This function is used to calculate the divisors of psr, pm, fp and it is
 * supposed to be called in set_dai_sysclk() and set_bclk().
 *
 * @ratio: desired overall ratio for the paticipating dividers
 * @usefp: for HCK setting, there is no need to set fp divider
 * @fp: bypass other dividers by setting fp directly if fp != 0
 * @tx: current setting is for playback or capture
 */
static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio,
				bool usefp, u32 fp)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
	u32 psr, pm = 999, maxfp, prod, sub, savesub, i, j;

	maxfp = usefp ? 16 : 1;

	if (usefp && fp)
		goto out_fp;

	if (ratio > 2 * 8 * 256 * maxfp || ratio < 2) {
		dev_err(dai->dev, "the ratio is out of range (2 ~ %d)\n",
				2 * 8 * 256 * maxfp);
		return -EINVAL;
	} else if (ratio % 2) {
		dev_err(dai->dev, "the raio must be even if using upper divider\n");
		return -EINVAL;
	}

	ratio /= 2;

	psr = ratio <= 256 * maxfp ? ESAI_xCCR_xPSR_BYPASS : ESAI_xCCR_xPSR_DIV8;

	/* Set the max fluctuation -- 0.1% of the max devisor */
	savesub = (psr ? 1 : 8)  * 256 * maxfp / 1000;

	/* Find the best value for PM */
	for (i = 1; i <= 256; i++) {
		for (j = 1; j <= maxfp; j++) {
			/* PSR (1 or 8) * PM (1 ~ 256) * FP (1 ~ 16) */
			prod = (psr ? 1 : 8) * i * j;

			if (prod == ratio)
				sub = 0;
			else if (prod / ratio == 1)
				sub = prod - ratio;
			else if (ratio / prod == 1)
				sub = ratio - prod;
			else
				continue;

			/* Calculate the fraction */
			sub = sub * 1000 / ratio;
			if (sub < savesub) {
				savesub = sub;
				pm = i;
				fp = j;
			}

			/* We are lucky */
			if (savesub == 0)
				goto out;
		}
	}

	if (pm == 999) {
		dev_err(dai->dev, "failed to calculate proper divisors\n");
		return -EINVAL;
	}

out:
	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
			   ESAI_xCCR_xPSR_MASK | ESAI_xCCR_xPM_MASK,
			   psr | ESAI_xCCR_xPM(pm));

out_fp:
	/* Bypass fp if not being required */
	if (maxfp <= 1)
		return 0;

	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
			   ESAI_xCCR_xFP_MASK, ESAI_xCCR_xFP(fp));

	return 0;
}

/**
 * This function mainly configures the clock frequency of MCLK (HCKT/HCKR)
 *
 * @Parameters:
 * clk_id: The clock source of HCKT/HCKR
 *	  (Input from outside; output from inside, FSYS or EXTAL)
 * freq: The required clock rate of HCKT/HCKR
 * dir: The clock direction of HCKT/HCKR
 *
 * Note: If the direction is input, we do not care about clk_id.
 */
static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
				   unsigned int freq, int dir)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
	struct clk *clksrc = esai_priv->extalclk;
	bool tx = clk_id <= ESAI_HCKT_EXTAL;
	bool in = dir == SND_SOC_CLOCK_IN;
	u32 ratio, ecr = 0;
	unsigned long clk_rate;
	int ret;

	/* Bypass divider settings if the requirement doesn't change */
	if (freq == esai_priv->hck_rate[tx] && dir == esai_priv->hck_dir[tx])
		return 0;

	/* sck_div can be only bypassed if ETO/ERO=0 and SNC_SOC_CLOCK_OUT */
	esai_priv->sck_div[tx] = true;

	/* Set the direction of HCKT/HCKR pins */
	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx),
			   ESAI_xCCR_xHCKD, in ? 0 : ESAI_xCCR_xHCKD);

	if (in)
		goto out;

	switch (clk_id) {
	case ESAI_HCKT_FSYS:
	case ESAI_HCKR_FSYS:
		clksrc = esai_priv->fsysclk;
		break;
	case ESAI_HCKT_EXTAL:
		ecr |= ESAI_ECR_ETI;
	case ESAI_HCKR_EXTAL:
		ecr |= ESAI_ECR_ERI;
		break;
	default:
		return -EINVAL;
	}

	if (IS_ERR(clksrc)) {
		dev_err(dai->dev, "no assigned %s clock\n",
				clk_id % 2 ? "extal" : "fsys");
		return PTR_ERR(clksrc);
	}
	clk_rate = clk_get_rate(clksrc);

	ratio = clk_rate / freq;
	if (ratio * freq > clk_rate)
		ret = ratio * freq - clk_rate;
	else if (ratio * freq < clk_rate)
		ret = clk_rate - ratio * freq;
	else
		ret = 0;

	/* Block if clock source can not be divided into the required rate */
	if (ret != 0 && clk_rate / ret < 1000) {
		dev_err(dai->dev, "failed to derive required HCK%c rate\n",
				tx ? 'T' : 'R');
		return -EINVAL;
	}

	/* Only EXTAL source can be output directly without using PSR and PM */
	if (ratio == 1 && clksrc == esai_priv->extalclk) {
		/* Bypass all the dividers if not being needed */
		ecr |= tx ? ESAI_ECR_ETO : ESAI_ECR_ERO;
		goto out;
	} else if (ratio < 2) {
		/* The ratio should be no less than 2 if using other sources */
		dev_err(dai->dev, "failed to derive required HCK%c rate\n",
				tx ? 'T' : 'R');
		return -EINVAL;
	}

	ret = fsl_esai_divisor_cal(dai, tx, ratio, false, 0);
	if (ret)
		return ret;

	esai_priv->sck_div[tx] = false;

out:
	esai_priv->hck_dir[tx] = dir;
	esai_priv->hck_rate[tx] = freq;

	regmap_update_bits(esai_priv->regmap, REG_ESAI_ECR,
			   tx ? ESAI_ECR_ETI | ESAI_ECR_ETO :
			   ESAI_ECR_ERI | ESAI_ECR_ERO, ecr);

	return 0;
}

/**
 * This function configures the related dividers according to the bclk rate
 */
static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
	u32 hck_rate = esai_priv->hck_rate[tx];
	u32 sub, ratio = hck_rate / freq;
	int ret;

	/* Don't apply for fully slave mode or unchanged bclk */
	if (esai_priv->slave_mode || esai_priv->sck_rate[tx] == freq)
		return 0;

	if (ratio * freq > hck_rate)
		sub = ratio * freq - hck_rate;
	else if (ratio * freq < hck_rate)
		sub = hck_rate - ratio * freq;
	else
		sub = 0;

	/* Block if clock source can not be divided into the required rate */
	if (sub != 0 && hck_rate / sub < 1000) {
		dev_err(dai->dev, "failed to derive required SCK%c rate\n",
				tx ? 'T' : 'R');
		return -EINVAL;
	}

	/* The ratio should be contented by FP alone if bypassing PM and PSR */
	if (!esai_priv->sck_div[tx] && (ratio > 16 || ratio == 0)) {
		dev_err(dai->dev, "the ratio is out of range (1 ~ 16)\n");
		return -EINVAL;
	}

	ret = fsl_esai_divisor_cal(dai, tx, ratio, true,
			esai_priv->sck_div[tx] ? 0 : ratio);
	if (ret)
		return ret;

	/* Save current bclk rate */
	esai_priv->sck_rate[tx] = freq;

	return 0;
}

static int fsl_esai_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask,
				     u32 rx_mask, int slots, int slot_width)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);

	regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR,
			   ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));

	regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMA,
			   ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(tx_mask));
	regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMB,
			   ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(tx_mask));

	regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR,
			   ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots));

	regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMA,
			   ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(rx_mask));
	regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMB,
			   ESAI_xSMB_xS_MASK, ESAI_xSMB_xS(rx_mask));

	esai_priv->slot_width = slot_width;

	return 0;
}

static int fsl_esai_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
	u32 xcr = 0, xccr = 0, mask;

	/* DAI mode */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		/* Data on rising edge of bclk, frame low, 1clk before data */
		xcr |= ESAI_xCR_xFSR;
		xccr |= ESAI_xCCR_xFSP | ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		/* Data on rising edge of bclk, frame high */
		xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		/* Data on rising edge of bclk, frame high, right aligned */
		xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCR_xWA;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		/* Data on rising edge of bclk, frame high, 1clk before data */
		xcr |= ESAI_xCR_xFSL | ESAI_xCR_xFSR;
		xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		/* Data on rising edge of bclk, frame high */
		xcr |= ESAI_xCR_xFSL;
		xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
		break;
	default:
		return -EINVAL;
	}

	/* DAI clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		/* Nothing to do for both normal cases */
		break;
	case SND_SOC_DAIFMT_IB_NF:
		/* Invert bit clock */
		xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		/* Invert frame clock */
		xccr ^= ESAI_xCCR_xFSP;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		/* Invert both clocks */
		xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP;
		break;
	default:
		return -EINVAL;
	}

	esai_priv->slave_mode = false;

	/* DAI clock master masks */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		esai_priv->slave_mode = true;
		break;
	case SND_SOC_DAIFMT_CBS_CFM:
		xccr |= ESAI_xCCR_xCKD;
		break;
	case SND_SOC_DAIFMT_CBM_CFS:
		xccr |= ESAI_xCCR_xFSD;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		xccr |= ESAI_xCCR_xFSD | ESAI_xCCR_xCKD;
		break;
	default:
		return -EINVAL;
	}

	mask = ESAI_xCR_xFSL | ESAI_xCR_xFSR;
	regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR, mask, xcr);
	regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR, mask, xcr);

	mask = ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP |
		ESAI_xCCR_xFSD | ESAI_xCCR_xCKD | ESAI_xCR_xWA;
	regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR, mask, xccr);
	regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR, mask, xccr);

	return 0;
}

static int fsl_esai_startup(struct snd_pcm_substream *substream,
			    struct snd_soc_dai *dai)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
	int ret;

	/*
	 * Some platforms might use the same bit to gate all three or two of
	 * clocks, so keep all clocks open/close at the same time for safety
	 */
	ret = clk_prepare_enable(esai_priv->coreclk);
	if (ret)
		return ret;
	if (!IS_ERR(esai_priv->extalclk)) {
		ret = clk_prepare_enable(esai_priv->extalclk);
		if (ret)
			goto err_extalck;
	}
	if (!IS_ERR(esai_priv->fsysclk)) {
		ret = clk_prepare_enable(esai_priv->fsysclk);
		if (ret)
			goto err_fsysclk;
	}

	if (!dai->active) {
		/* Set synchronous mode */
		regmap_update_bits(esai_priv->regmap, REG_ESAI_SAICR,
				   ESAI_SAICR_SYNC, esai_priv->synchronous ?
				   ESAI_SAICR_SYNC : 0);

		/* Set a default slot number -- 2 */
		regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR,
				   ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2));
		regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR,
				   ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2));
	}

	return 0;

err_fsysclk:
	if (!IS_ERR(esai_priv->extalclk))
		clk_disable_unprepare(esai_priv->extalclk);
err_extalck:
	clk_disable_unprepare(esai_priv->coreclk);

	return ret;
}

static int fsl_esai_hw_params(struct snd_pcm_substream *substream,
			      struct snd_pcm_hw_params *params,
			      struct snd_soc_dai *dai)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	u32 width = snd_pcm_format_width(params_format(params));
	u32 channels = params_channels(params);
	u32 bclk, mask, val;
	int ret;

	bclk = params_rate(params) * esai_priv->slot_width * 2;

	ret = fsl_esai_set_bclk(dai, tx, bclk);
	if (ret)
		return ret;

	/* Use Normal mode to support monaural audio */
	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
			   ESAI_xCR_xMOD_MASK, params_channels(params) > 1 ?
			   ESAI_xCR_xMOD_NETWORK : 0);

	regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
			   ESAI_xFCR_xFR_MASK, ESAI_xFCR_xFR);

	mask = ESAI_xFCR_xFR_MASK | ESAI_xFCR_xWA_MASK | ESAI_xFCR_xFWM_MASK |
	      (tx ? ESAI_xFCR_TE_MASK | ESAI_xFCR_TIEN : ESAI_xFCR_RE_MASK);
	val = ESAI_xFCR_xWA(width) | ESAI_xFCR_xFWM(esai_priv->fifo_depth) |
	     (tx ? ESAI_xFCR_TE(channels) | ESAI_xFCR_TIEN : ESAI_xFCR_RE(channels));

	regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), mask, val);

	mask = ESAI_xCR_xSWS_MASK | (tx ? ESAI_xCR_PADC : 0);
	val = ESAI_xCR_xSWS(esai_priv->slot_width, width) | (tx ? ESAI_xCR_PADC : 0);

	regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), mask, val);

	/* Remove ESAI personal reset by configuring ESAI_PCRC and ESAI_PRRC */
	regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC,
			   ESAI_PRRC_PDC_MASK, ESAI_PRRC_PDC(ESAI_GPIO));
	regmap_update_bits(esai_priv->regmap, REG_ESAI_PCRC,
			   ESAI_PCRC_PC_MASK, ESAI_PCRC_PC(ESAI_GPIO));
	return 0;
}

static void fsl_esai_shutdown(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);

	if (!IS_ERR(esai_priv->fsysclk))
		clk_disable_unprepare(esai_priv->fsysclk);
	if (!IS_ERR(esai_priv->extalclk))
		clk_disable_unprepare(esai_priv->extalclk);
	clk_disable_unprepare(esai_priv->coreclk);
}

static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd,
			    struct snd_soc_dai *dai)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);
	bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
	u8 i, channels = substream->runtime->channels;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
				   ESAI_xFCR_xFEN_MASK, ESAI_xFCR_xFEN);

		/* Write initial words reqiured by ESAI as normal procedure */
		for (i = 0; tx && i < channels; i++)
			regmap_write(esai_priv->regmap, REG_ESAI_ETDR, 0x0);

		regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
				   tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK,
				   tx ? ESAI_xCR_TE(channels) : ESAI_xCR_RE(channels));
		break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx),
				   tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, 0);

		/* Disable and reset FIFO */
		regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
				   ESAI_xFCR_xFR | ESAI_xFCR_xFEN, ESAI_xFCR_xFR);
		regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx),
				   ESAI_xFCR_xFR, 0);
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static struct snd_soc_dai_ops fsl_esai_dai_ops = {
	.startup = fsl_esai_startup,
	.shutdown = fsl_esai_shutdown,
	.trigger = fsl_esai_trigger,
	.hw_params = fsl_esai_hw_params,
	.set_sysclk = fsl_esai_set_dai_sysclk,
	.set_fmt = fsl_esai_set_dai_fmt,
	.xlate_tdm_slot_mask = fsl_asoc_xlate_tdm_slot_mask,
	.set_tdm_slot = fsl_esai_set_dai_tdm_slot,
};

static int fsl_esai_dai_probe(struct snd_soc_dai *dai)
{
	struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai);

	snd_soc_dai_init_dma_data(dai, &esai_priv->dma_params_tx,
				  &esai_priv->dma_params_rx);

	return 0;
}

static struct snd_soc_dai_driver fsl_esai_dai = {
	.probe = fsl_esai_dai_probe,
	.playback = {
		.stream_name = "CPU-Playback",
		.channels_min = 1,
		.channels_max = 12,
		.rates = FSL_ESAI_RATES,
		.formats = FSL_ESAI_FORMATS,
	},
	.capture = {
		.stream_name = "CPU-Capture",
		.channels_min = 1,
		.channels_max = 8,
		.rates = FSL_ESAI_RATES,
		.formats = FSL_ESAI_FORMATS,
	},
	.ops = &fsl_esai_dai_ops,
};

static const struct snd_soc_component_driver fsl_esai_component = {
	.name		= "fsl-esai",
};

static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case REG_ESAI_ERDR:
	case REG_ESAI_ECR:
	case REG_ESAI_ESR:
	case REG_ESAI_TFCR:
	case REG_ESAI_TFSR:
	case REG_ESAI_RFCR:
	case REG_ESAI_RFSR:
	case REG_ESAI_RX0:
	case REG_ESAI_RX1:
	case REG_ESAI_RX2:
	case REG_ESAI_RX3:
	case REG_ESAI_SAISR:
	case REG_ESAI_SAICR:
	case REG_ESAI_TCR:
	case REG_ESAI_TCCR:
	case REG_ESAI_RCR:
	case REG_ESAI_RCCR:
	case REG_ESAI_TSMA:
	case REG_ESAI_TSMB:
	case REG_ESAI_RSMA:
	case REG_ESAI_RSMB:
	case REG_ESAI_PRRC:
	case REG_ESAI_PCRC:
		return true;
	default:
		return false;
	}
}

static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case REG_ESAI_ETDR:
	case REG_ESAI_ECR:
	case REG_ESAI_TFCR:
	case REG_ESAI_RFCR:
	case REG_ESAI_TX0:
	case REG_ESAI_TX1:
	case REG_ESAI_TX2:
	case REG_ESAI_TX3:
	case REG_ESAI_TX4:
	case REG_ESAI_TX5:
	case REG_ESAI_TSR:
	case REG_ESAI_SAICR:
	case REG_ESAI_TCR:
	case REG_ESAI_TCCR:
	case REG_ESAI_RCR:
	case REG_ESAI_RCCR:
	case REG_ESAI_TSMA:
	case REG_ESAI_TSMB:
	case REG_ESAI_RSMA:
	case REG_ESAI_RSMB:
	case REG_ESAI_PRRC:
	case REG_ESAI_PCRC:
		return true;
	default:
		return false;
	}
}

static struct regmap_config fsl_esai_regmap_config = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,

	.max_register = REG_ESAI_PCRC,
	.readable_reg = fsl_esai_readable_reg,
	.writeable_reg = fsl_esai_writeable_reg,
};

static int fsl_esai_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct fsl_esai *esai_priv;
	struct resource *res;
	const uint32_t *iprop;
	void __iomem *regs;
	int irq, ret;

	esai_priv = devm_kzalloc(&pdev->dev, sizeof(*esai_priv), GFP_KERNEL);
	if (!esai_priv)
		return -ENOMEM;

	esai_priv->pdev = pdev;
	strcpy(esai_priv->name, np->name);

	if (of_property_read_bool(np, "big-endian"))
		fsl_esai_regmap_config.val_format_endian = REGMAP_ENDIAN_BIG;

	/* Get the addresses and IRQ */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(regs))
		return PTR_ERR(regs);

	esai_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev,
			"core", regs, &fsl_esai_regmap_config);
	if (IS_ERR(esai_priv->regmap)) {
		dev_err(&pdev->dev, "failed to init regmap: %ld\n",
				PTR_ERR(esai_priv->regmap));
		return PTR_ERR(esai_priv->regmap);
	}

	esai_priv->coreclk = devm_clk_get(&pdev->dev, "core");
	if (IS_ERR(esai_priv->coreclk)) {
		dev_err(&pdev->dev, "failed to get core clock: %ld\n",
				PTR_ERR(esai_priv->coreclk));
		return PTR_ERR(esai_priv->coreclk);
	}

	esai_priv->extalclk = devm_clk_get(&pdev->dev, "extal");
	if (IS_ERR(esai_priv->extalclk))
		dev_warn(&pdev->dev, "failed to get extal clock: %ld\n",
				PTR_ERR(esai_priv->extalclk));

	esai_priv->fsysclk = devm_clk_get(&pdev->dev, "fsys");
	if (IS_ERR(esai_priv->fsysclk))
		dev_warn(&pdev->dev, "failed to get fsys clock: %ld\n",
				PTR_ERR(esai_priv->fsysclk));

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		dev_err(&pdev->dev, "no irq for node %s\n", np->full_name);
		return irq;
	}

	ret = devm_request_irq(&pdev->dev, irq, esai_isr, 0,
			       esai_priv->name, esai_priv);
	if (ret) {
		dev_err(&pdev->dev, "failed to claim irq %u\n", irq);
		return ret;
	}

	/* Set a default slot size */
	esai_priv->slot_width = 32;

	/* Set a default master/slave state */
	esai_priv->slave_mode = true;

	/* Determine the FIFO depth */
	iprop = of_get_property(np, "fsl,fifo-depth", NULL);
	if (iprop)
		esai_priv->fifo_depth = be32_to_cpup(iprop);
	else
		esai_priv->fifo_depth = 64;

	esai_priv->dma_params_tx.maxburst = 16;
	esai_priv->dma_params_rx.maxburst = 16;
	esai_priv->dma_params_tx.addr = res->start + REG_ESAI_ETDR;
	esai_priv->dma_params_rx.addr = res->start + REG_ESAI_ERDR;

	esai_priv->synchronous =
		of_property_read_bool(np, "fsl,esai-synchronous");

	/* Implement full symmetry for synchronous mode */
	if (esai_priv->synchronous) {
		fsl_esai_dai.symmetric_rates = 1;
		fsl_esai_dai.symmetric_channels = 1;
		fsl_esai_dai.symmetric_samplebits = 1;
	}

	dev_set_drvdata(&pdev->dev, esai_priv);

	/* Reset ESAI unit */
	ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ERST);
	if (ret) {
		dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret);
		return ret;
	}

	/*
	 * We need to enable ESAI so as to access some of its registers.
	 * Otherwise, we would fail to dump regmap from user space.
	 */
	ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ESAIEN);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret);
		return ret;
	}

	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_esai_component,
					      &fsl_esai_dai, 1);
	if (ret) {
		dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
		return ret;
	}

	ret = imx_pcm_dma_init(pdev);
	if (ret)
		dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret);

	return ret;
}

static const struct of_device_id fsl_esai_dt_ids[] = {
	{ .compatible = "fsl,imx35-esai", },
	{ .compatible = "fsl,vf610-esai", },
	{}
};
MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids);

static struct platform_driver fsl_esai_driver = {
	.probe = fsl_esai_probe,
	.driver = {
		.name = "fsl-esai-dai",
		.owner = THIS_MODULE,
		.of_match_table = fsl_esai_dt_ids,
	},
};

module_platform_driver(fsl_esai_driver);

MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("Freescale ESAI CPU DAI driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:fsl-esai-dai");