summaryrefslogtreecommitdiffstats
path: root/sound/soc/atmel/atmel-pdmic.c
blob: 04ec6f0af17987851a456d0b82a13aa434767e67 (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
// SPDX-License-Identifier: GPL-2.0-or-later
/* Atmel PDMIC driver
 *
 * Copyright (C) 2015 Atmel
 *
 * Author: Songjun Wu <songjun.wu@atmel.com>
 */

#include <linux/of.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>
#include <sound/tlv.h>
#include "atmel-pdmic.h"

struct atmel_pdmic_pdata {
	u32 mic_min_freq;
	u32 mic_max_freq;
	s32 mic_offset;
	const char *card_name;
};

struct atmel_pdmic {
	dma_addr_t phy_base;
	struct regmap *regmap;
	struct clk *pclk;
	struct clk *gclk;
	struct device *dev;
	int irq;
	struct snd_pcm_substream *substream;
	const struct atmel_pdmic_pdata *pdata;
};

static const struct of_device_id atmel_pdmic_of_match[] = {
	{
		.compatible = "atmel,sama5d2-pdmic",
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match);

#define PDMIC_OFFSET_MAX_VAL	S16_MAX
#define PDMIC_OFFSET_MIN_VAL	S16_MIN

static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev)
{
	struct device_node *np = dev->of_node;
	struct atmel_pdmic_pdata *pdata;

	if (!np) {
		dev_err(dev, "device node not found\n");
		return ERR_PTR(-EINVAL);
	}

	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return ERR_PTR(-ENOMEM);

	if (of_property_read_string(np, "atmel,model", &pdata->card_name))
		pdata->card_name = "PDMIC";

	if (of_property_read_u32(np, "atmel,mic-min-freq",
				 &pdata->mic_min_freq)) {
		dev_err(dev, "failed to get mic-min-freq\n");
		return ERR_PTR(-EINVAL);
	}

	if (of_property_read_u32(np, "atmel,mic-max-freq",
				 &pdata->mic_max_freq)) {
		dev_err(dev, "failed to get mic-max-freq\n");
		return ERR_PTR(-EINVAL);
	}

	if (pdata->mic_max_freq < pdata->mic_min_freq) {
		dev_err(dev,
			"mic-max-freq should not be less than mic-min-freq\n");
		return ERR_PTR(-EINVAL);
	}

	if (of_property_read_s32(np, "atmel,mic-offset", &pdata->mic_offset))
		pdata->mic_offset = 0;

	if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) {
		dev_warn(dev,
			 "mic-offset value %d is larger than the max value %d, the max value is specified\n",
			 pdata->mic_offset, PDMIC_OFFSET_MAX_VAL);
		pdata->mic_offset = PDMIC_OFFSET_MAX_VAL;
	} else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) {
		dev_warn(dev,
			 "mic-offset value %d is less than the min value %d, the min value is specified\n",
			 pdata->mic_offset, PDMIC_OFFSET_MIN_VAL);
		pdata->mic_offset = PDMIC_OFFSET_MIN_VAL;
	}

	return pdata;
}

/* cpu dai component */
static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
	int ret;

	ret = clk_prepare_enable(dd->gclk);
	if (ret)
		return ret;

	ret =  clk_prepare_enable(dd->pclk);
	if (ret) {
		clk_disable_unprepare(dd->gclk);
		return ret;
	}

	/* Clear all bits in the Control Register(PDMIC_CR) */
	regmap_write(dd->regmap, PDMIC_CR, 0);

	dd->substream = substream;

	/* Enable the overrun error interrupt */
	regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE);

	return 0;
}

static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);

	/* Disable the overrun error interrupt */
	regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE);

	clk_disable_unprepare(dd->gclk);
	clk_disable_unprepare(dd->pclk);
}

static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream,
					struct snd_soc_dai *cpu_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
	u32 val;

	/* Clean the PDMIC Converted Data Register */
	return regmap_read(dd->regmap, PDMIC_CDR, &val);
}

static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = {
	.startup	= atmel_pdmic_cpu_dai_startup,
	.shutdown	= atmel_pdmic_cpu_dai_shutdown,
	.prepare	= atmel_pdmic_cpu_dai_prepare,
};

#define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)

static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = {
	.capture = {
		.channels_min	= 1,
		.channels_max	= 1,
		.rates		= SNDRV_PCM_RATE_KNOT,
		.formats	= ATMEL_PDMIC_FORMATS,},
	.ops = &atmel_pdmic_cpu_dai_ops,
};

static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = {
	.name = "atmel-pdmic",
};

/* platform */
#define ATMEL_PDMIC_MAX_BUF_SIZE  (64 * 1024)
#define ATMEL_PDMIC_PREALLOC_BUF_SIZE  ATMEL_PDMIC_MAX_BUF_SIZE

static const struct snd_pcm_hardware atmel_pdmic_hw = {
	.info			= SNDRV_PCM_INFO_MMAP
				| SNDRV_PCM_INFO_MMAP_VALID
				| SNDRV_PCM_INFO_INTERLEAVED
				| SNDRV_PCM_INFO_RESUME
				| SNDRV_PCM_INFO_PAUSE,
	.formats		= ATMEL_PDMIC_FORMATS,
	.buffer_bytes_max	= ATMEL_PDMIC_MAX_BUF_SIZE,
	.period_bytes_min	= 256,
	.period_bytes_max	= 32 * 1024,
	.periods_min		= 2,
	.periods_max		= 256,
};

static int
atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params,
				struct dma_slave_config *slave_config)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
	int ret;

	ret = snd_hwparams_to_dma_slave_config(substream, params,
					       slave_config);
	if (ret) {
		dev_err(dd->dev,
			"hw params to dma slave configure failed\n");
		return ret;
	}

	slave_config->src_addr		= dd->phy_base + PDMIC_CDR;
	slave_config->src_maxburst	= 1;
	slave_config->dst_maxburst	= 1;

	return 0;
}

static const struct snd_dmaengine_pcm_config
atmel_pdmic_dmaengine_pcm_config = {
	.prepare_slave_config	= atmel_pdmic_platform_configure_dma,
	.pcm_hardware		= &atmel_pdmic_hw,
	.prealloc_buffer_size	= ATMEL_PDMIC_PREALLOC_BUF_SIZE,
};

/* codec */
/* Mic Gain = dgain * 2^(-scale) */
struct mic_gain {
	unsigned int dgain;
	unsigned int scale;
};

/* range from -90 dB to 90 dB */
static const struct mic_gain mic_gain_table[] = {
{    1, 15}, {    1, 14},                           /* -90, -84 dB */
{    3, 15}, {    1, 13}, {    3, 14}, {    1, 12}, /* -81, -78, -75, -72 dB */
{    5, 14}, {   13, 15},                           /* -70, -68 dB */
{    9, 14}, {   21, 15}, {   23, 15}, {   13, 14}, /* -65 ~ -62 dB */
{   29, 15}, {   33, 15}, {   37, 15}, {   41, 15}, /* -61 ~ -58 dB */
{   23, 14}, {   13, 13}, {   58, 15}, {   65, 15}, /* -57 ~ -54 dB */
{   73, 15}, {   41, 14}, {   23, 13}, {   13, 12}, /* -53 ~ -50 dB */
{   29, 13}, {   65, 14}, {   73, 14}, {   41, 13}, /* -49 ~ -46 dB */
{   23, 12}, {  207, 15}, {   29, 12}, {   65, 13}, /* -45 ~ -42 dB */
{   73, 13}, {   41, 12}, {   23, 11}, {  413, 15}, /* -41 ~ -38 dB */
{  463, 15}, {  519, 15}, {  583, 15}, {  327, 14}, /* -37 ~ -34 dB */
{  367, 14}, {  823, 15}, {  231, 13}, { 1036, 15}, /* -33 ~ -30 dB */
{ 1163, 15}, { 1305, 15}, {  183, 12}, { 1642, 15}, /* -29 ~ -26 dB */
{ 1843, 15}, { 2068, 15}, {  145, 11}, { 2603, 15}, /* -25 ~ -22 dB */
{  365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */
{ 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */
{  917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */
{11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /*  -9 ~ -6 dB */
{18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /*  -5 ~ -2 dB */
{ 7301, 13}, {    1,  0}, {18383, 14}, {10313, 13}, /*  -1 ~ 2 dB */
{23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /*   3 ~ 6 dB */
{ 4585, 11}, {20577, 13}, { 1443,  9}, {25905, 13}, /*   7 ~ 10 dB */
{14533, 12}, { 8153, 11}, { 2287,  9}, {20529, 12}, /*  11 ~ 14 dB */
{11517, 11}, { 6461, 10}, {28997, 12}, { 4067,  9}, /*  15 ~ 18 dB */
{18253, 11}, {   10,  0}, {22979, 11}, {25783, 11}, /*  19 ~ 22 dB */
{28929, 11}, {32459, 11}, { 9105,  9}, {20431, 10}, /*  23 ~ 26 dB */
{22925, 10}, {12861,  9}, { 7215,  8}, {16191,  9}, /*  27 ~ 30 dB */
{ 9083,  8}, {20383,  9}, {11435,  8}, { 6145,  7}, /*  31 ~ 34 dB */
{ 3599,  6}, {32305,  9}, {18123,  8}, {20335,  8}, /*  35 ~ 38 dB */
{  713,  3}, {  100,  0}, { 7181,  6}, { 8057,  6}, /*  39 ~ 42 dB */
{  565,  2}, {20287,  7}, {11381,  6}, {25539,  7}, /*  43 ~ 46 dB */
{ 1791,  3}, { 4019,  4}, { 9019,  5}, {20239,  6}, /*  47 ~ 50 dB */
{ 5677,  4}, {25479,  6}, { 7147,  4}, { 8019,  4}, /*  51 ~ 54 dB */
{17995,  5}, {20191,  5}, {11327,  4}, {12709,  4}, /*  55 ~ 58 dB */
{ 3565,  2}, { 1000,  0}, { 1122,  0}, { 1259,  0}, /*  59 ~ 62 dB */
{ 2825,  1}, {12679,  3}, { 7113,  2}, { 7981,  2}, /*  63 ~ 66 dB */
{ 8955,  2}, {20095,  3}, {22547,  3}, {12649,  2}, /*  67 ~ 70 dB */
{28385,  3}, { 3981,  0}, {17867,  2}, {20047,  2}, /*  71 ~ 74 dB */
{11247,  1}, {12619,  1}, {14159,  1}, {31773,  2}, /*  75 ~ 78 dB */
{17825,  1}, {10000,  0}, {11220,  0}, {12589,  0}, /*  79 ~ 82 dB */
{28251,  1}, {15849,  0}, {17783,  0}, {19953,  0}, /*  83 ~ 86 dB */
{22387,  0}, {25119,  0}, {28184,  0}, {31623,  0}, /*  87 ~ 90 dB */
};

static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,
	0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0),
	2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0),
	6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0),
	8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0),
);

static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
	unsigned int dgain_val, scale_val;
	int i;

	dgain_val = (snd_soc_component_read32(component, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK)
		    >> PDMIC_DSPR1_DGAIN_SHIFT;

	scale_val = (snd_soc_component_read32(component, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK)
		    >> PDMIC_DSPR0_SCALE_SHIFT;

	for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
		if ((mic_gain_table[i].dgain == dgain_val) &&
		    (mic_gain_table[i].scale == scale_val))
			ucontrol->value.integer.value[0] = i;
	}

	return 0;
}

static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol,
	struct snd_ctl_elem_value *ucontrol)
{
	struct soc_mixer_control *mc =
		(struct soc_mixer_control *)kcontrol->private_value;
	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
	int max = mc->max;
	unsigned int val;
	int ret;

	val = ucontrol->value.integer.value[0];

	if (val > max)
		return -EINVAL;

	ret = snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK,
			 mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT);
	if (ret < 0)
		return ret;

	ret = snd_soc_component_update_bits(component, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK,
			 mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT);
	if (ret < 0)
		return ret;

	return 0;
}

static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {
SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT,
		   ARRAY_SIZE(mic_gain_table)-1, 0,
		   pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv),

SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,
	   PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),

SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),
};

static int atmel_pdmic_component_probe(struct snd_soc_component *component)
{
	struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);

	snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK,
		     (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));

	return 0;
}

static struct snd_soc_component_driver soc_component_dev_pdmic = {
	.probe			= atmel_pdmic_component_probe,
	.controls		= atmel_pdmic_snd_controls,
	.num_controls		= ARRAY_SIZE(atmel_pdmic_snd_controls),
	.idle_bias_on		= 1,
	.use_pmdown_time	= 1,
	.endianness		= 1,
	.non_legacy_dai_naming	= 1,
};

/* codec dai component */
#define PDMIC_MR_PRESCAL_MAX_VAL 127

static int
atmel_pdmic_codec_dai_hw_params(struct snd_pcm_substream *substream,
			    struct snd_pcm_hw_params *params,
			    struct snd_soc_dai *codec_dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_component *component = codec_dai->component;
	unsigned int rate_min = substream->runtime->hw.rate_min;
	unsigned int rate_max = substream->runtime->hw.rate_max;
	int fs = params_rate(params);
	int bits = params_width(params);
	unsigned long pclk_rate, gclk_rate;
	unsigned int f_pdmic;
	u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal;

	if (params_channels(params) != 1) {
		dev_err(component->dev,
			"only supports one channel\n");
		return -EINVAL;
	}

	if ((fs < rate_min) || (fs > rate_max)) {
		dev_err(component->dev,
			"sample rate is %dHz, min rate is %dHz, max rate is %dHz\n",
			fs, rate_min, rate_max);

		return -EINVAL;
	}

	switch (bits) {
	case 16:
		dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS
			     << PDMIC_DSPR0_SIZE_SHIFT);
		break;
	case 32:
		dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS
			     << PDMIC_DSPR0_SIZE_SHIFT);
		break;
	default:
		return -EINVAL;
	}

	if ((fs << 7) > (rate_max << 6)) {
		f_pdmic = fs << 6;
		dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT;
	} else {
		f_pdmic = fs << 7;
		dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT;
	}

	pclk_rate = clk_get_rate(dd->pclk);
	gclk_rate = clk_get_rate(dd->gclk);

	/* PRESCAL = SELCK/(2*f_pdmic) - 1*/
	pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1;
	gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1;

	if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) ||
	    (gclk_rate/((gclk_prescal + 1) << 1) <
	     pclk_rate/((pclk_prescal + 1) << 1))) {
		mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
		mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT;
	} else {
		mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
		mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT;
	}

	snd_soc_component_update_bits(component, PDMIC_MR,
		PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val);

	snd_soc_component_update_bits(component, PDMIC_DSPR0,
		PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val);

	return 0;
}

static int atmel_pdmic_codec_dai_prepare(struct snd_pcm_substream *substream,
					struct snd_soc_dai *codec_dai)
{
	struct snd_soc_component *component = codec_dai->component;

	snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
			    PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);

	return 0;
}

static int atmel_pdmic_codec_dai_trigger(struct snd_pcm_substream *substream,
					int cmd, struct snd_soc_dai *codec_dai)
{
	struct snd_soc_component *component = codec_dai->component;
	u32 val;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT;
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT;
		break;
	default:
		return -EINVAL;
	}

	snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val);

	return 0;
}

static const struct snd_soc_dai_ops atmel_pdmic_codec_dai_ops = {
	.hw_params	= atmel_pdmic_codec_dai_hw_params,
	.prepare	= atmel_pdmic_codec_dai_prepare,
	.trigger	= atmel_pdmic_codec_dai_trigger,
};

#define ATMEL_PDMIC_CODEC_DAI_NAME  "atmel-pdmic-hifi"

static struct snd_soc_dai_driver atmel_pdmic_codec_dai = {
	.name = ATMEL_PDMIC_CODEC_DAI_NAME,
	.capture = {
		.stream_name	= "Capture",
		.channels_min	= 1,
		.channels_max	= 1,
		.rates		= SNDRV_PCM_RATE_KNOT,
		.formats	= ATMEL_PDMIC_FORMATS,
	},
	.ops = &atmel_pdmic_codec_dai_ops,
};

/* ASoC sound card */
static int atmel_pdmic_asoc_card_init(struct device *dev,
				struct snd_soc_card *card)
{
	struct snd_soc_dai_link *dai_link;
	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
	struct snd_soc_dai_link_component *comp;

	dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
	if (!dai_link)
		return -ENOMEM;

	comp = devm_kzalloc(dev, 3 * sizeof(*comp), GFP_KERNEL);
	if (!comp)
		return -ENOMEM;

	dai_link->cpus		= &comp[0];
	dai_link->codecs	= &comp[1];
	dai_link->platforms	= &comp[2];

	dai_link->num_cpus	= 1;
	dai_link->num_codecs	= 1;
	dai_link->num_platforms	= 1;

	dai_link->name			= "PDMIC";
	dai_link->stream_name		= "PDMIC PCM";
	dai_link->codecs->dai_name	= ATMEL_PDMIC_CODEC_DAI_NAME;
	dai_link->cpus->dai_name	= dev_name(dev);
	dai_link->codecs->name		= dev_name(dev);
	dai_link->platforms->name	= dev_name(dev);

	card->dai_link	= dai_link;
	card->num_links	= 1;
	card->name	= dd->pdata->card_name;
	card->dev	= dev;

	return 0;
}

static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,
	unsigned int *rate_min, unsigned int *rate_max)
{
	u32 mic_min_freq = dd->pdata->mic_min_freq;
	u32 mic_max_freq = dd->pdata->mic_max_freq;
	u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);
	u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);

	if (mic_max_freq > clk_max_rate)
		mic_max_freq = clk_max_rate;

	if (mic_min_freq < clk_min_rate)
		mic_min_freq = clk_min_rate;

	*rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);
	*rate_max = mic_max_freq >> 6;
}

/* PDMIC interrupt handler */
static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)
{
	struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;
	u32 pdmic_isr;
	irqreturn_t ret = IRQ_NONE;

	regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);

	if (pdmic_isr & PDMIC_ISR_OVRE) {
		regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
				   PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);

		snd_pcm_stop_xrun(dd->substream);

		ret = IRQ_HANDLED;
	}

	return ret;
}

/* regmap configuration */
#define ATMEL_PDMIC_REG_MAX    0x124
static const struct regmap_config atmel_pdmic_regmap_config = {
	.reg_bits	= 32,
	.reg_stride	= 4,
	.val_bits	= 32,
	.max_register	= ATMEL_PDMIC_REG_MAX,
};

static int atmel_pdmic_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct atmel_pdmic *dd;
	struct resource *res;
	void __iomem *io_base;
	const struct atmel_pdmic_pdata *pdata;
	struct snd_soc_card *card;
	unsigned int rate_min, rate_max;
	int ret;

	pdata = atmel_pdmic_dt_init(dev);
	if (IS_ERR(pdata))
		return PTR_ERR(pdata);

	dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
	if (!dd)
		return -ENOMEM;

	dd->pdata = pdata;
	dd->dev = dev;

	dd->irq = platform_get_irq(pdev, 0);
	if (dd->irq < 0)
		return dd->irq;

	dd->pclk = devm_clk_get(dev, "pclk");
	if (IS_ERR(dd->pclk)) {
		ret = PTR_ERR(dd->pclk);
		dev_err(dev, "failed to get peripheral clock: %d\n", ret);
		return ret;
	}

	dd->gclk = devm_clk_get(dev, "gclk");
	if (IS_ERR(dd->gclk)) {
		ret = PTR_ERR(dd->gclk);
		dev_err(dev, "failed to get GCK: %d\n", ret);
		return ret;
	}

	/* The gclk clock frequency must always be three times
	 * lower than the pclk clock frequency
	 */
	ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);
	if (ret) {
		dev_err(dev, "failed to set GCK clock rate: %d\n", ret);
		return ret;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	io_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(io_base))
		return PTR_ERR(io_base);

	dd->phy_base = res->start;

	dd->regmap = devm_regmap_init_mmio(dev, io_base,
					   &atmel_pdmic_regmap_config);
	if (IS_ERR(dd->regmap)) {
		ret = PTR_ERR(dd->regmap);
		dev_err(dev, "failed to init register map: %d\n", ret);
		return ret;
	}

	ret =  devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,
				"PDMIC", (void *)dd);
	if (ret < 0) {
		dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
			dd->irq, ret);
		return ret;
	}

	/* Get the minimal and maximal sample rate that the microphone supports */
	atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);

	/* register cpu dai */
	atmel_pdmic_cpu_dai.capture.rate_min = rate_min;
	atmel_pdmic_cpu_dai.capture.rate_max = rate_max;
	ret = devm_snd_soc_register_component(dev,
					      &atmel_pdmic_cpu_dai_component,
					      &atmel_pdmic_cpu_dai, 1);
	if (ret) {
		dev_err(dev, "could not register CPU DAI: %d\n", ret);
		return ret;
	}

	/* register platform */
	ret = devm_snd_dmaengine_pcm_register(dev,
					     &atmel_pdmic_dmaengine_pcm_config,
					     0);
	if (ret) {
		dev_err(dev, "could not register platform: %d\n", ret);
		return ret;
	}

	/* register codec and codec dai */
	atmel_pdmic_codec_dai.capture.rate_min = rate_min;
	atmel_pdmic_codec_dai.capture.rate_max = rate_max;
	ret = devm_snd_soc_register_component(dev, &soc_component_dev_pdmic,
				     &atmel_pdmic_codec_dai, 1);
	if (ret) {
		dev_err(dev, "could not register component: %d\n", ret);
		return ret;
	}

	/* register sound card */
	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
	if (!card) {
		ret = -ENOMEM;
		goto unregister_codec;
	}

	snd_soc_card_set_drvdata(card, dd);

	ret = atmel_pdmic_asoc_card_init(dev, card);
	if (ret) {
		dev_err(dev, "failed to init sound card: %d\n", ret);
		goto unregister_codec;
	}

	ret = devm_snd_soc_register_card(dev, card);
	if (ret) {
		dev_err(dev, "failed to register sound card: %d\n", ret);
		goto unregister_codec;
	}

	return 0;

unregister_codec:
	return ret;
}

static int atmel_pdmic_remove(struct platform_device *pdev)
{
	return 0;
}

static struct platform_driver atmel_pdmic_driver = {
	.driver	= {
		.name		= "atmel-pdmic",
		.of_match_table	= of_match_ptr(atmel_pdmic_of_match),
		.pm		= &snd_soc_pm_ops,
	},
	.probe	= atmel_pdmic_probe,
	.remove	= atmel_pdmic_remove,
};
module_platform_driver(atmel_pdmic_driver);

MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");
MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
MODULE_LICENSE("GPL v2");