summaryrefslogtreecommitdiffstats
path: root/sound/soc/omap/omap-dmic.c
blob: 5a6aeaf552a89666672e4bc2a46a3106ba26a532 (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
/*
 * omap-dmic.c  --  OMAP ASoC DMIC DAI driver
 *
 * Copyright (C) 2010 - 2011 Texas Instruments
 *
 * Author: David Lambert <dlambert@ti.com>
 *	   Misael Lopez Cruz <misael.lopez@ti.com>
 *	   Liam Girdwood <lrg@ti.com>
 *	   Peter Ujfalusi <peter.ujfalusi@ti.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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/of_device.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "omap-pcm.h"
#include "omap-dmic.h"

struct omap_dmic {
	struct device *dev;
	void __iomem *io_base;
	struct clk *fclk;
	int fclk_freq;
	int out_freq;
	int clk_div;
	int sysclk;
	int threshold;
	u32 ch_enabled;
	bool active;
	struct mutex mutex;
};

/*
 * Stream DMA parameters
 */
static struct omap_pcm_dma_data omap_dmic_dai_dma_params = {
	.name		= "DMIC capture",
};

static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val)
{
	__raw_writel(val, dmic->io_base + reg);
}

static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg)
{
	return __raw_readl(dmic->io_base + reg);
}

static inline void omap_dmic_start(struct omap_dmic *dmic)
{
	u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);

	/* Configure DMA controller */
	omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET_REG,
			OMAP_DMIC_DMA_ENABLE);

	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl | dmic->ch_enabled);
}

static inline void omap_dmic_stop(struct omap_dmic *dmic)
{
	u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
			ctrl & ~OMAP_DMIC_UP_ENABLE_MASK);

	/* Disable DMA request generation */
	omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR_REG,
			OMAP_DMIC_DMA_ENABLE);

}

static inline int dmic_is_enabled(struct omap_dmic *dmic)
{
	return omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG) &
						OMAP_DMIC_UP_ENABLE_MASK;
}

static int omap_dmic_dai_startup(struct snd_pcm_substream *substream,
				  struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	int ret = 0;

	mutex_lock(&dmic->mutex);

	if (!dai->active)
		dmic->active = 1;
	else
		ret = -EBUSY;

	mutex_unlock(&dmic->mutex);

	snd_soc_dai_set_dma_data(dai, substream, &omap_dmic_dai_dma_params);
	return ret;
}

static void omap_dmic_dai_shutdown(struct snd_pcm_substream *substream,
				    struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	mutex_lock(&dmic->mutex);

	if (!dai->active)
		dmic->active = 0;

	mutex_unlock(&dmic->mutex);
}

static int omap_dmic_select_divider(struct omap_dmic *dmic, int sample_rate)
{
	int divider = -EINVAL;

	/*
	 * 192KHz rate is only supported with 19.2MHz/3.84MHz clock
	 * configuration.
	 */
	if (sample_rate == 192000) {
		if (dmic->fclk_freq == 19200000 && dmic->out_freq == 3840000)
			divider = 0x6; /* Divider: 5 (192KHz sampling rate) */
		else
			dev_err(dmic->dev,
				"invalid clock configuration for 192KHz\n");

		return divider;
	}

	switch (dmic->out_freq) {
	case 1536000:
		if (dmic->fclk_freq != 24576000)
			goto div_err;
		divider = 0x4; /* Divider: 16 */
		break;
	case 2400000:
		switch (dmic->fclk_freq) {
		case 12000000:
			divider = 0x5; /* Divider: 5 */
			break;
		case 19200000:
			divider = 0x0; /* Divider: 8 */
			break;
		case 24000000:
			divider = 0x2; /* Divider: 10 */
			break;
		default:
			goto div_err;
		}
		break;
	case 3072000:
		if (dmic->fclk_freq != 24576000)
			goto div_err;
		divider = 0x3; /* Divider: 8 */
		break;
	case 3840000:
		if (dmic->fclk_freq != 19200000)
			goto div_err;
		divider = 0x1; /* Divider: 5 (96KHz sampling rate) */
		break;
	default:
		dev_err(dmic->dev, "invalid out frequency: %dHz\n",
			dmic->out_freq);
		break;
	}

	return divider;

div_err:
	dev_err(dmic->dev, "invalid out frequency %dHz for %dHz input\n",
		dmic->out_freq, dmic->fclk_freq);
	return -EINVAL;
}

static int omap_dmic_dai_hw_params(struct snd_pcm_substream *substream,
				    struct snd_pcm_hw_params *params,
				    struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	struct omap_pcm_dma_data *dma_data;
	int channels;

	dmic->clk_div = omap_dmic_select_divider(dmic, params_rate(params));
	if (dmic->clk_div < 0) {
		dev_err(dmic->dev, "no valid divider for %dHz from %dHz\n",
			dmic->out_freq, dmic->fclk_freq);
		return -EINVAL;
	}

	dmic->ch_enabled = 0;
	channels = params_channels(params);
	switch (channels) {
	case 6:
		dmic->ch_enabled |= OMAP_DMIC_UP3_ENABLE;
	case 4:
		dmic->ch_enabled |= OMAP_DMIC_UP2_ENABLE;
	case 2:
		dmic->ch_enabled |= OMAP_DMIC_UP1_ENABLE;
		break;
	default:
		dev_err(dmic->dev, "invalid number of legacy channels\n");
		return -EINVAL;
	}

	/* packet size is threshold * channels */
	dma_data = snd_soc_dai_get_dma_data(dai, substream);
	dma_data->packet_size = dmic->threshold * channels;

	return 0;
}

static int omap_dmic_dai_prepare(struct snd_pcm_substream *substream,
				  struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
	u32 ctrl;

	/* Configure uplink threshold */
	omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL_REG, dmic->threshold);

	ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);

	/* Set dmic out format */
	ctrl &= ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK);
	ctrl |= (OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
		 OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);

	/* Configure dmic clock divider */
	ctrl &= ~OMAP_DMIC_CLK_DIV_MASK;
	ctrl |= OMAP_DMIC_CLK_DIV(dmic->clk_div);

	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl);

	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
			ctrl | OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
			OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);

	return 0;
}

static int omap_dmic_dai_trigger(struct snd_pcm_substream *substream,
				  int cmd, struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		omap_dmic_start(dmic);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		omap_dmic_stop(dmic);
		break;
	default:
		break;
	}

	return 0;
}

static int omap_dmic_select_fclk(struct omap_dmic *dmic, int clk_id,
				 unsigned int freq)
{
	struct clk *parent_clk;
	char *parent_clk_name;
	int ret = 0;

	switch (freq) {
	case 12000000:
	case 19200000:
	case 24000000:
	case 24576000:
		break;
	default:
		dev_err(dmic->dev, "invalid input frequency: %dHz\n", freq);
		dmic->fclk_freq = 0;
		return -EINVAL;
	}

	if (dmic->sysclk == clk_id) {
		dmic->fclk_freq = freq;
		return 0;
	}

	/* re-parent not allowed if a stream is ongoing */
	if (dmic->active && dmic_is_enabled(dmic)) {
		dev_err(dmic->dev, "can't re-parent when DMIC active\n");
		return -EBUSY;
	}

	switch (clk_id) {
	case OMAP_DMIC_SYSCLK_PAD_CLKS:
		parent_clk_name = "pad_clks_ck";
		break;
	case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS:
		parent_clk_name = "slimbus_clk";
		break;
	case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS:
		parent_clk_name = "dmic_sync_mux_ck";
		break;
	default:
		dev_err(dmic->dev, "fclk clk_id (%d) not supported\n", clk_id);
		return -EINVAL;
	}

	parent_clk = clk_get(dmic->dev, parent_clk_name);
	if (IS_ERR(parent_clk)) {
		dev_err(dmic->dev, "can't get %s\n", parent_clk_name);
		return -ENODEV;
	}

	mutex_lock(&dmic->mutex);
	if (dmic->active) {
		/* disable clock while reparenting */
		pm_runtime_put_sync(dmic->dev);
		ret = clk_set_parent(dmic->fclk, parent_clk);
		pm_runtime_get_sync(dmic->dev);
	} else {
		ret = clk_set_parent(dmic->fclk, parent_clk);
	}
	mutex_unlock(&dmic->mutex);

	if (ret < 0) {
		dev_err(dmic->dev, "re-parent failed\n");
		goto err_busy;
	}

	dmic->sysclk = clk_id;
	dmic->fclk_freq = freq;

err_busy:
	clk_put(parent_clk);

	return ret;
}

static int omap_dmic_select_outclk(struct omap_dmic *dmic, int clk_id,
				    unsigned int freq)
{
	int ret = 0;

	if (clk_id != OMAP_DMIC_ABE_DMIC_CLK) {
		dev_err(dmic->dev, "output clk_id (%d) not supported\n",
			clk_id);
		return -EINVAL;
	}

	switch (freq) {
	case 1536000:
	case 2400000:
	case 3072000:
	case 3840000:
		dmic->out_freq = freq;
		break;
	default:
		dev_err(dmic->dev, "invalid out frequency: %dHz\n", freq);
		dmic->out_freq = 0;
		ret = -EINVAL;
	}

	return ret;
}

static int omap_dmic_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
				    unsigned int freq, int dir)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	if (dir == SND_SOC_CLOCK_IN)
		return omap_dmic_select_fclk(dmic, clk_id, freq);
	else if (dir == SND_SOC_CLOCK_OUT)
		return omap_dmic_select_outclk(dmic, clk_id, freq);

	dev_err(dmic->dev, "invalid clock direction (%d)\n", dir);
	return -EINVAL;
}

static const struct snd_soc_dai_ops omap_dmic_dai_ops = {
	.startup	= omap_dmic_dai_startup,
	.shutdown	= omap_dmic_dai_shutdown,
	.hw_params	= omap_dmic_dai_hw_params,
	.prepare	= omap_dmic_dai_prepare,
	.trigger	= omap_dmic_dai_trigger,
	.set_sysclk	= omap_dmic_set_dai_sysclk,
};

static int omap_dmic_probe(struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	pm_runtime_enable(dmic->dev);

	/* Disable lines while request is ongoing */
	pm_runtime_get_sync(dmic->dev);
	omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 0x00);
	pm_runtime_put_sync(dmic->dev);

	/* Configure DMIC threshold value */
	dmic->threshold = OMAP_DMIC_THRES_MAX - 3;
	return 0;
}

static int omap_dmic_remove(struct snd_soc_dai *dai)
{
	struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);

	pm_runtime_disable(dmic->dev);

	return 0;
}

static struct snd_soc_dai_driver omap_dmic_dai = {
	.name = "omap-dmic",
	.probe = omap_dmic_probe,
	.remove = omap_dmic_remove,
	.capture = {
		.channels_min = 2,
		.channels_max = 6,
		.rates = SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
		.formats = SNDRV_PCM_FMTBIT_S32_LE,
		.sig_bits = 24,
	},
	.ops = &omap_dmic_dai_ops,
};

static __devinit int asoc_dmic_probe(struct platform_device *pdev)
{
	struct omap_dmic *dmic;
	struct resource *res;
	int ret;

	dmic = devm_kzalloc(&pdev->dev, sizeof(struct omap_dmic), GFP_KERNEL);
	if (!dmic)
		return -ENOMEM;

	platform_set_drvdata(pdev, dmic);
	dmic->dev = &pdev->dev;
	dmic->sysclk = OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS;

	mutex_init(&dmic->mutex);

	dmic->fclk = clk_get(dmic->dev, "fck");
	if (IS_ERR(dmic->fclk)) {
		dev_err(dmic->dev, "cant get fck\n");
		return -ENODEV;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
	if (!res) {
		dev_err(dmic->dev, "invalid dma memory resource\n");
		ret = -ENODEV;
		goto err_put_clk;
	}
	omap_dmic_dai_dma_params.port_addr = res->start + OMAP_DMIC_DATA_REG;

	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!res) {
		dev_err(dmic->dev, "invalid dma resource\n");
		ret = -ENODEV;
		goto err_put_clk;
	}
	omap_dmic_dai_dma_params.dma_req = res->start;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
	if (!res) {
		dev_err(dmic->dev, "invalid memory resource\n");
		ret = -ENODEV;
		goto err_put_clk;
	}

	if (!devm_request_mem_region(&pdev->dev, res->start,
				     resource_size(res), pdev->name)) {
		dev_err(dmic->dev, "memory region already claimed\n");
		ret = -ENODEV;
		goto err_put_clk;
	}

	dmic->io_base = devm_ioremap(&pdev->dev, res->start,
				     resource_size(res));
	if (!dmic->io_base) {
		ret = -ENOMEM;
		goto err_put_clk;
	}

	ret = snd_soc_register_dai(&pdev->dev, &omap_dmic_dai);
	if (ret)
		goto err_put_clk;

	return 0;

err_put_clk:
	clk_put(dmic->fclk);
	return ret;
}

static int __devexit asoc_dmic_remove(struct platform_device *pdev)
{
	struct omap_dmic *dmic = platform_get_drvdata(pdev);

	snd_soc_unregister_dai(&pdev->dev);
	clk_put(dmic->fclk);

	return 0;
}

static const struct of_device_id omap_dmic_of_match[] = {
	{ .compatible = "ti,omap4-dmic", },
	{ }
};
MODULE_DEVICE_TABLE(of, omap_dmic_of_match);

static struct platform_driver asoc_dmic_driver = {
	.driver = {
		.name = "omap-dmic",
		.owner = THIS_MODULE,
		.of_match_table = omap_dmic_of_match,
	},
	.probe = asoc_dmic_probe,
	.remove = __devexit_p(asoc_dmic_remove),
};

module_platform_driver(asoc_dmic_driver);

MODULE_ALIAS("platform:omap-dmic");
MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
MODULE_DESCRIPTION("OMAP DMIC ASoC Interface");
MODULE_LICENSE("GPL");