xref: /openbmc/linux/sound/soc/atmel/atmel-pdmic.c (revision 4f727ece)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Atmel PDMIC driver
3  *
4  * Copyright (C) 2015 Atmel
5  *
6  * Author: Songjun Wu <songjun.wu@atmel.com>
7  */
8 
9 #include <linux/of.h>
10 #include <linux/clk.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <linux/regmap.h>
14 #include <sound/core.h>
15 #include <sound/dmaengine_pcm.h>
16 #include <sound/pcm_params.h>
17 #include <sound/tlv.h>
18 #include "atmel-pdmic.h"
19 
20 struct atmel_pdmic_pdata {
21 	u32 mic_min_freq;
22 	u32 mic_max_freq;
23 	s32 mic_offset;
24 	const char *card_name;
25 };
26 
27 struct atmel_pdmic {
28 	dma_addr_t phy_base;
29 	struct regmap *regmap;
30 	struct clk *pclk;
31 	struct clk *gclk;
32 	struct device *dev;
33 	int irq;
34 	struct snd_pcm_substream *substream;
35 	const struct atmel_pdmic_pdata *pdata;
36 };
37 
38 static const struct of_device_id atmel_pdmic_of_match[] = {
39 	{
40 		.compatible = "atmel,sama5d2-pdmic",
41 	}, {
42 		/* sentinel */
43 	}
44 };
45 MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match);
46 
47 #define PDMIC_OFFSET_MAX_VAL	S16_MAX
48 #define PDMIC_OFFSET_MIN_VAL	S16_MIN
49 
50 static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev)
51 {
52 	struct device_node *np = dev->of_node;
53 	struct atmel_pdmic_pdata *pdata;
54 
55 	if (!np) {
56 		dev_err(dev, "device node not found\n");
57 		return ERR_PTR(-EINVAL);
58 	}
59 
60 	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
61 	if (!pdata)
62 		return ERR_PTR(-ENOMEM);
63 
64 	if (of_property_read_string(np, "atmel,model", &pdata->card_name))
65 		pdata->card_name = "PDMIC";
66 
67 	if (of_property_read_u32(np, "atmel,mic-min-freq",
68 				 &pdata->mic_min_freq)) {
69 		dev_err(dev, "failed to get mic-min-freq\n");
70 		return ERR_PTR(-EINVAL);
71 	}
72 
73 	if (of_property_read_u32(np, "atmel,mic-max-freq",
74 				 &pdata->mic_max_freq)) {
75 		dev_err(dev, "failed to get mic-max-freq\n");
76 		return ERR_PTR(-EINVAL);
77 	}
78 
79 	if (pdata->mic_max_freq < pdata->mic_min_freq) {
80 		dev_err(dev,
81 			"mic-max-freq should not be less than mic-min-freq\n");
82 		return ERR_PTR(-EINVAL);
83 	}
84 
85 	if (of_property_read_s32(np, "atmel,mic-offset", &pdata->mic_offset))
86 		pdata->mic_offset = 0;
87 
88 	if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) {
89 		dev_warn(dev,
90 			 "mic-offset value %d is larger than the max value %d, the max value is specified\n",
91 			 pdata->mic_offset, PDMIC_OFFSET_MAX_VAL);
92 		pdata->mic_offset = PDMIC_OFFSET_MAX_VAL;
93 	} else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) {
94 		dev_warn(dev,
95 			 "mic-offset value %d is less than the min value %d, the min value is specified\n",
96 			 pdata->mic_offset, PDMIC_OFFSET_MIN_VAL);
97 		pdata->mic_offset = PDMIC_OFFSET_MIN_VAL;
98 	}
99 
100 	return pdata;
101 }
102 
103 /* cpu dai component */
104 static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream,
105 					struct snd_soc_dai *cpu_dai)
106 {
107 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
108 	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
109 	int ret;
110 
111 	ret = clk_prepare_enable(dd->gclk);
112 	if (ret)
113 		return ret;
114 
115 	ret =  clk_prepare_enable(dd->pclk);
116 	if (ret) {
117 		clk_disable_unprepare(dd->gclk);
118 		return ret;
119 	}
120 
121 	/* Clear all bits in the Control Register(PDMIC_CR) */
122 	regmap_write(dd->regmap, PDMIC_CR, 0);
123 
124 	dd->substream = substream;
125 
126 	/* Enable the overrun error interrupt */
127 	regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE);
128 
129 	return 0;
130 }
131 
132 static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream,
133 					struct snd_soc_dai *cpu_dai)
134 {
135 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
136 	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
137 
138 	/* Disable the overrun error interrupt */
139 	regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE);
140 
141 	clk_disable_unprepare(dd->gclk);
142 	clk_disable_unprepare(dd->pclk);
143 }
144 
145 static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream,
146 					struct snd_soc_dai *cpu_dai)
147 {
148 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
149 	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
150 	u32 val;
151 
152 	/* Clean the PDMIC Converted Data Register */
153 	return regmap_read(dd->regmap, PDMIC_CDR, &val);
154 }
155 
156 static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = {
157 	.startup	= atmel_pdmic_cpu_dai_startup,
158 	.shutdown	= atmel_pdmic_cpu_dai_shutdown,
159 	.prepare	= atmel_pdmic_cpu_dai_prepare,
160 };
161 
162 #define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
163 
164 static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = {
165 	.capture = {
166 		.channels_min	= 1,
167 		.channels_max	= 1,
168 		.rates		= SNDRV_PCM_RATE_KNOT,
169 		.formats	= ATMEL_PDMIC_FORMATS,},
170 	.ops = &atmel_pdmic_cpu_dai_ops,
171 };
172 
173 static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = {
174 	.name = "atmel-pdmic",
175 };
176 
177 /* platform */
178 #define ATMEL_PDMIC_MAX_BUF_SIZE  (64 * 1024)
179 #define ATMEL_PDMIC_PREALLOC_BUF_SIZE  ATMEL_PDMIC_MAX_BUF_SIZE
180 
181 static const struct snd_pcm_hardware atmel_pdmic_hw = {
182 	.info			= SNDRV_PCM_INFO_MMAP
183 				| SNDRV_PCM_INFO_MMAP_VALID
184 				| SNDRV_PCM_INFO_INTERLEAVED
185 				| SNDRV_PCM_INFO_RESUME
186 				| SNDRV_PCM_INFO_PAUSE,
187 	.formats		= ATMEL_PDMIC_FORMATS,
188 	.buffer_bytes_max	= ATMEL_PDMIC_MAX_BUF_SIZE,
189 	.period_bytes_min	= 256,
190 	.period_bytes_max	= 32 * 1024,
191 	.periods_min		= 2,
192 	.periods_max		= 256,
193 };
194 
195 static int
196 atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream,
197 				struct snd_pcm_hw_params *params,
198 				struct dma_slave_config *slave_config)
199 {
200 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
201 	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
202 	int ret;
203 
204 	ret = snd_hwparams_to_dma_slave_config(substream, params,
205 					       slave_config);
206 	if (ret) {
207 		dev_err(dd->dev,
208 			"hw params to dma slave configure failed\n");
209 		return ret;
210 	}
211 
212 	slave_config->src_addr		= dd->phy_base + PDMIC_CDR;
213 	slave_config->src_maxburst	= 1;
214 	slave_config->dst_maxburst	= 1;
215 
216 	return 0;
217 }
218 
219 static const struct snd_dmaengine_pcm_config
220 atmel_pdmic_dmaengine_pcm_config = {
221 	.prepare_slave_config	= atmel_pdmic_platform_configure_dma,
222 	.pcm_hardware		= &atmel_pdmic_hw,
223 	.prealloc_buffer_size	= ATMEL_PDMIC_PREALLOC_BUF_SIZE,
224 };
225 
226 /* codec */
227 /* Mic Gain = dgain * 2^(-scale) */
228 struct mic_gain {
229 	unsigned int dgain;
230 	unsigned int scale;
231 };
232 
233 /* range from -90 dB to 90 dB */
234 static const struct mic_gain mic_gain_table[] = {
235 {    1, 15}, {    1, 14},                           /* -90, -84 dB */
236 {    3, 15}, {    1, 13}, {    3, 14}, {    1, 12}, /* -81, -78, -75, -72 dB */
237 {    5, 14}, {   13, 15},                           /* -70, -68 dB */
238 {    9, 14}, {   21, 15}, {   23, 15}, {   13, 14}, /* -65 ~ -62 dB */
239 {   29, 15}, {   33, 15}, {   37, 15}, {   41, 15}, /* -61 ~ -58 dB */
240 {   23, 14}, {   13, 13}, {   58, 15}, {   65, 15}, /* -57 ~ -54 dB */
241 {   73, 15}, {   41, 14}, {   23, 13}, {   13, 12}, /* -53 ~ -50 dB */
242 {   29, 13}, {   65, 14}, {   73, 14}, {   41, 13}, /* -49 ~ -46 dB */
243 {   23, 12}, {  207, 15}, {   29, 12}, {   65, 13}, /* -45 ~ -42 dB */
244 {   73, 13}, {   41, 12}, {   23, 11}, {  413, 15}, /* -41 ~ -38 dB */
245 {  463, 15}, {  519, 15}, {  583, 15}, {  327, 14}, /* -37 ~ -34 dB */
246 {  367, 14}, {  823, 15}, {  231, 13}, { 1036, 15}, /* -33 ~ -30 dB */
247 { 1163, 15}, { 1305, 15}, {  183, 12}, { 1642, 15}, /* -29 ~ -26 dB */
248 { 1843, 15}, { 2068, 15}, {  145, 11}, { 2603, 15}, /* -25 ~ -22 dB */
249 {  365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */
250 { 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */
251 {  917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */
252 {11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /*  -9 ~ -6 dB */
253 {18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /*  -5 ~ -2 dB */
254 { 7301, 13}, {    1,  0}, {18383, 14}, {10313, 13}, /*  -1 ~ 2 dB */
255 {23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /*   3 ~ 6 dB */
256 { 4585, 11}, {20577, 13}, { 1443,  9}, {25905, 13}, /*   7 ~ 10 dB */
257 {14533, 12}, { 8153, 11}, { 2287,  9}, {20529, 12}, /*  11 ~ 14 dB */
258 {11517, 11}, { 6461, 10}, {28997, 12}, { 4067,  9}, /*  15 ~ 18 dB */
259 {18253, 11}, {   10,  0}, {22979, 11}, {25783, 11}, /*  19 ~ 22 dB */
260 {28929, 11}, {32459, 11}, { 9105,  9}, {20431, 10}, /*  23 ~ 26 dB */
261 {22925, 10}, {12861,  9}, { 7215,  8}, {16191,  9}, /*  27 ~ 30 dB */
262 { 9083,  8}, {20383,  9}, {11435,  8}, { 6145,  7}, /*  31 ~ 34 dB */
263 { 3599,  6}, {32305,  9}, {18123,  8}, {20335,  8}, /*  35 ~ 38 dB */
264 {  713,  3}, {  100,  0}, { 7181,  6}, { 8057,  6}, /*  39 ~ 42 dB */
265 {  565,  2}, {20287,  7}, {11381,  6}, {25539,  7}, /*  43 ~ 46 dB */
266 { 1791,  3}, { 4019,  4}, { 9019,  5}, {20239,  6}, /*  47 ~ 50 dB */
267 { 5677,  4}, {25479,  6}, { 7147,  4}, { 8019,  4}, /*  51 ~ 54 dB */
268 {17995,  5}, {20191,  5}, {11327,  4}, {12709,  4}, /*  55 ~ 58 dB */
269 { 3565,  2}, { 1000,  0}, { 1122,  0}, { 1259,  0}, /*  59 ~ 62 dB */
270 { 2825,  1}, {12679,  3}, { 7113,  2}, { 7981,  2}, /*  63 ~ 66 dB */
271 { 8955,  2}, {20095,  3}, {22547,  3}, {12649,  2}, /*  67 ~ 70 dB */
272 {28385,  3}, { 3981,  0}, {17867,  2}, {20047,  2}, /*  71 ~ 74 dB */
273 {11247,  1}, {12619,  1}, {14159,  1}, {31773,  2}, /*  75 ~ 78 dB */
274 {17825,  1}, {10000,  0}, {11220,  0}, {12589,  0}, /*  79 ~ 82 dB */
275 {28251,  1}, {15849,  0}, {17783,  0}, {19953,  0}, /*  83 ~ 86 dB */
276 {22387,  0}, {25119,  0}, {28184,  0}, {31623,  0}, /*  87 ~ 90 dB */
277 };
278 
279 static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,
280 	0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0),
281 	2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0),
282 	6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0),
283 	8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0),
284 );
285 
286 static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol,
287 	struct snd_ctl_elem_value *ucontrol)
288 {
289 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
290 	unsigned int dgain_val, scale_val;
291 	int i;
292 
293 	dgain_val = (snd_soc_component_read32(component, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK)
294 		    >> PDMIC_DSPR1_DGAIN_SHIFT;
295 
296 	scale_val = (snd_soc_component_read32(component, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK)
297 		    >> PDMIC_DSPR0_SCALE_SHIFT;
298 
299 	for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
300 		if ((mic_gain_table[i].dgain == dgain_val) &&
301 		    (mic_gain_table[i].scale == scale_val))
302 			ucontrol->value.integer.value[0] = i;
303 	}
304 
305 	return 0;
306 }
307 
308 static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol,
309 	struct snd_ctl_elem_value *ucontrol)
310 {
311 	struct soc_mixer_control *mc =
312 		(struct soc_mixer_control *)kcontrol->private_value;
313 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
314 	int max = mc->max;
315 	unsigned int val;
316 	int ret;
317 
318 	val = ucontrol->value.integer.value[0];
319 
320 	if (val > max)
321 		return -EINVAL;
322 
323 	ret = snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK,
324 			 mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT);
325 	if (ret < 0)
326 		return ret;
327 
328 	ret = snd_soc_component_update_bits(component, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK,
329 			 mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT);
330 	if (ret < 0)
331 		return ret;
332 
333 	return 0;
334 }
335 
336 static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {
337 SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT,
338 		   ARRAY_SIZE(mic_gain_table)-1, 0,
339 		   pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv),
340 
341 SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,
342 	   PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),
343 
344 SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),
345 };
346 
347 static int atmel_pdmic_component_probe(struct snd_soc_component *component)
348 {
349 	struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
350 	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
351 
352 	snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK,
353 		     (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));
354 
355 	return 0;
356 }
357 
358 static struct snd_soc_component_driver soc_component_dev_pdmic = {
359 	.probe			= atmel_pdmic_component_probe,
360 	.controls		= atmel_pdmic_snd_controls,
361 	.num_controls		= ARRAY_SIZE(atmel_pdmic_snd_controls),
362 	.idle_bias_on		= 1,
363 	.use_pmdown_time	= 1,
364 	.endianness		= 1,
365 	.non_legacy_dai_naming	= 1,
366 };
367 
368 /* codec dai component */
369 #define PDMIC_MR_PRESCAL_MAX_VAL 127
370 
371 static int
372 atmel_pdmic_codec_dai_hw_params(struct snd_pcm_substream *substream,
373 			    struct snd_pcm_hw_params *params,
374 			    struct snd_soc_dai *codec_dai)
375 {
376 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
377 	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
378 	struct snd_soc_component *component = codec_dai->component;
379 	unsigned int rate_min = substream->runtime->hw.rate_min;
380 	unsigned int rate_max = substream->runtime->hw.rate_max;
381 	int fs = params_rate(params);
382 	int bits = params_width(params);
383 	unsigned long pclk_rate, gclk_rate;
384 	unsigned int f_pdmic;
385 	u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal;
386 
387 	if (params_channels(params) != 1) {
388 		dev_err(component->dev,
389 			"only supports one channel\n");
390 		return -EINVAL;
391 	}
392 
393 	if ((fs < rate_min) || (fs > rate_max)) {
394 		dev_err(component->dev,
395 			"sample rate is %dHz, min rate is %dHz, max rate is %dHz\n",
396 			fs, rate_min, rate_max);
397 
398 		return -EINVAL;
399 	}
400 
401 	switch (bits) {
402 	case 16:
403 		dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS
404 			     << PDMIC_DSPR0_SIZE_SHIFT);
405 		break;
406 	case 32:
407 		dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS
408 			     << PDMIC_DSPR0_SIZE_SHIFT);
409 		break;
410 	default:
411 		return -EINVAL;
412 	}
413 
414 	if ((fs << 7) > (rate_max << 6)) {
415 		f_pdmic = fs << 6;
416 		dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT;
417 	} else {
418 		f_pdmic = fs << 7;
419 		dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT;
420 	}
421 
422 	pclk_rate = clk_get_rate(dd->pclk);
423 	gclk_rate = clk_get_rate(dd->gclk);
424 
425 	/* PRESCAL = SELCK/(2*f_pdmic) - 1*/
426 	pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1;
427 	gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1;
428 
429 	if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) ||
430 	    (gclk_rate/((gclk_prescal + 1) << 1) <
431 	     pclk_rate/((pclk_prescal + 1) << 1))) {
432 		mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
433 		mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT;
434 	} else {
435 		mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT;
436 		mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT;
437 	}
438 
439 	snd_soc_component_update_bits(component, PDMIC_MR,
440 		PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val);
441 
442 	snd_soc_component_update_bits(component, PDMIC_DSPR0,
443 		PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val);
444 
445 	return 0;
446 }
447 
448 static int atmel_pdmic_codec_dai_prepare(struct snd_pcm_substream *substream,
449 					struct snd_soc_dai *codec_dai)
450 {
451 	struct snd_soc_component *component = codec_dai->component;
452 
453 	snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
454 			    PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
455 
456 	return 0;
457 }
458 
459 static int atmel_pdmic_codec_dai_trigger(struct snd_pcm_substream *substream,
460 					int cmd, struct snd_soc_dai *codec_dai)
461 {
462 	struct snd_soc_component *component = codec_dai->component;
463 	u32 val;
464 
465 	switch (cmd) {
466 	case SNDRV_PCM_TRIGGER_START:
467 	case SNDRV_PCM_TRIGGER_RESUME:
468 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
469 		val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT;
470 		break;
471 	case SNDRV_PCM_TRIGGER_STOP:
472 	case SNDRV_PCM_TRIGGER_SUSPEND:
473 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
474 		val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT;
475 		break;
476 	default:
477 		return -EINVAL;
478 	}
479 
480 	snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val);
481 
482 	return 0;
483 }
484 
485 static const struct snd_soc_dai_ops atmel_pdmic_codec_dai_ops = {
486 	.hw_params	= atmel_pdmic_codec_dai_hw_params,
487 	.prepare	= atmel_pdmic_codec_dai_prepare,
488 	.trigger	= atmel_pdmic_codec_dai_trigger,
489 };
490 
491 #define ATMEL_PDMIC_CODEC_DAI_NAME  "atmel-pdmic-hifi"
492 
493 static struct snd_soc_dai_driver atmel_pdmic_codec_dai = {
494 	.name = ATMEL_PDMIC_CODEC_DAI_NAME,
495 	.capture = {
496 		.stream_name	= "Capture",
497 		.channels_min	= 1,
498 		.channels_max	= 1,
499 		.rates		= SNDRV_PCM_RATE_KNOT,
500 		.formats	= ATMEL_PDMIC_FORMATS,
501 	},
502 	.ops = &atmel_pdmic_codec_dai_ops,
503 };
504 
505 /* ASoC sound card */
506 static int atmel_pdmic_asoc_card_init(struct device *dev,
507 				struct snd_soc_card *card)
508 {
509 	struct snd_soc_dai_link *dai_link;
510 	struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
511 
512 	dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
513 	if (!dai_link)
514 		return -ENOMEM;
515 
516 	dai_link->name			= "PDMIC";
517 	dai_link->stream_name		= "PDMIC PCM";
518 	dai_link->codec_dai_name	= ATMEL_PDMIC_CODEC_DAI_NAME;
519 	dai_link->cpu_dai_name		= dev_name(dev);
520 	dai_link->codec_name		= dev_name(dev);
521 	dai_link->platform_name		= dev_name(dev);
522 
523 	card->dai_link	= dai_link;
524 	card->num_links	= 1;
525 	card->name	= dd->pdata->card_name;
526 	card->dev	= dev;
527 
528 	return 0;
529 }
530 
531 static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,
532 	unsigned int *rate_min, unsigned int *rate_max)
533 {
534 	u32 mic_min_freq = dd->pdata->mic_min_freq;
535 	u32 mic_max_freq = dd->pdata->mic_max_freq;
536 	u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);
537 	u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);
538 
539 	if (mic_max_freq > clk_max_rate)
540 		mic_max_freq = clk_max_rate;
541 
542 	if (mic_min_freq < clk_min_rate)
543 		mic_min_freq = clk_min_rate;
544 
545 	*rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);
546 	*rate_max = mic_max_freq >> 6;
547 }
548 
549 /* PDMIC interrupt handler */
550 static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)
551 {
552 	struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;
553 	u32 pdmic_isr;
554 	irqreturn_t ret = IRQ_NONE;
555 
556 	regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);
557 
558 	if (pdmic_isr & PDMIC_ISR_OVRE) {
559 		regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
560 				   PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
561 
562 		snd_pcm_stop_xrun(dd->substream);
563 
564 		ret = IRQ_HANDLED;
565 	}
566 
567 	return ret;
568 }
569 
570 /* regmap configuration */
571 #define ATMEL_PDMIC_REG_MAX    0x124
572 static const struct regmap_config atmel_pdmic_regmap_config = {
573 	.reg_bits	= 32,
574 	.reg_stride	= 4,
575 	.val_bits	= 32,
576 	.max_register	= ATMEL_PDMIC_REG_MAX,
577 };
578 
579 static int atmel_pdmic_probe(struct platform_device *pdev)
580 {
581 	struct device *dev = &pdev->dev;
582 	struct atmel_pdmic *dd;
583 	struct resource *res;
584 	void __iomem *io_base;
585 	const struct atmel_pdmic_pdata *pdata;
586 	struct snd_soc_card *card;
587 	unsigned int rate_min, rate_max;
588 	int ret;
589 
590 	pdata = atmel_pdmic_dt_init(dev);
591 	if (IS_ERR(pdata))
592 		return PTR_ERR(pdata);
593 
594 	dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
595 	if (!dd)
596 		return -ENOMEM;
597 
598 	dd->pdata = pdata;
599 	dd->dev = dev;
600 
601 	dd->irq = platform_get_irq(pdev, 0);
602 	if (dd->irq < 0) {
603 		ret = dd->irq;
604 		dev_err(dev, "failed to get irq: %d\n", ret);
605 		return ret;
606 	}
607 
608 	dd->pclk = devm_clk_get(dev, "pclk");
609 	if (IS_ERR(dd->pclk)) {
610 		ret = PTR_ERR(dd->pclk);
611 		dev_err(dev, "failed to get peripheral clock: %d\n", ret);
612 		return ret;
613 	}
614 
615 	dd->gclk = devm_clk_get(dev, "gclk");
616 	if (IS_ERR(dd->gclk)) {
617 		ret = PTR_ERR(dd->gclk);
618 		dev_err(dev, "failed to get GCK: %d\n", ret);
619 		return ret;
620 	}
621 
622 	/* The gclk clock frequency must always be three times
623 	 * lower than the pclk clock frequency
624 	 */
625 	ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);
626 	if (ret) {
627 		dev_err(dev, "failed to set GCK clock rate: %d\n", ret);
628 		return ret;
629 	}
630 
631 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
632 	io_base = devm_ioremap_resource(dev, res);
633 	if (IS_ERR(io_base))
634 		return PTR_ERR(io_base);
635 
636 	dd->phy_base = res->start;
637 
638 	dd->regmap = devm_regmap_init_mmio(dev, io_base,
639 					   &atmel_pdmic_regmap_config);
640 	if (IS_ERR(dd->regmap)) {
641 		ret = PTR_ERR(dd->regmap);
642 		dev_err(dev, "failed to init register map: %d\n", ret);
643 		return ret;
644 	}
645 
646 	ret =  devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,
647 				"PDMIC", (void *)dd);
648 	if (ret < 0) {
649 		dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
650 			dd->irq, ret);
651 		return ret;
652 	}
653 
654 	/* Get the minimal and maximal sample rate that the microphone supports */
655 	atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);
656 
657 	/* register cpu dai */
658 	atmel_pdmic_cpu_dai.capture.rate_min = rate_min;
659 	atmel_pdmic_cpu_dai.capture.rate_max = rate_max;
660 	ret = devm_snd_soc_register_component(dev,
661 					      &atmel_pdmic_cpu_dai_component,
662 					      &atmel_pdmic_cpu_dai, 1);
663 	if (ret) {
664 		dev_err(dev, "could not register CPU DAI: %d\n", ret);
665 		return ret;
666 	}
667 
668 	/* register platform */
669 	ret = devm_snd_dmaengine_pcm_register(dev,
670 					     &atmel_pdmic_dmaengine_pcm_config,
671 					     0);
672 	if (ret) {
673 		dev_err(dev, "could not register platform: %d\n", ret);
674 		return ret;
675 	}
676 
677 	/* register codec and codec dai */
678 	atmel_pdmic_codec_dai.capture.rate_min = rate_min;
679 	atmel_pdmic_codec_dai.capture.rate_max = rate_max;
680 	ret = devm_snd_soc_register_component(dev, &soc_component_dev_pdmic,
681 				     &atmel_pdmic_codec_dai, 1);
682 	if (ret) {
683 		dev_err(dev, "could not register component: %d\n", ret);
684 		return ret;
685 	}
686 
687 	/* register sound card */
688 	card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
689 	if (!card) {
690 		ret = -ENOMEM;
691 		goto unregister_codec;
692 	}
693 
694 	snd_soc_card_set_drvdata(card, dd);
695 
696 	ret = atmel_pdmic_asoc_card_init(dev, card);
697 	if (ret) {
698 		dev_err(dev, "failed to init sound card: %d\n", ret);
699 		goto unregister_codec;
700 	}
701 
702 	ret = devm_snd_soc_register_card(dev, card);
703 	if (ret) {
704 		dev_err(dev, "failed to register sound card: %d\n", ret);
705 		goto unregister_codec;
706 	}
707 
708 	return 0;
709 
710 unregister_codec:
711 	return ret;
712 }
713 
714 static int atmel_pdmic_remove(struct platform_device *pdev)
715 {
716 	return 0;
717 }
718 
719 static struct platform_driver atmel_pdmic_driver = {
720 	.driver	= {
721 		.name		= "atmel-pdmic",
722 		.of_match_table	= of_match_ptr(atmel_pdmic_of_match),
723 		.pm		= &snd_soc_pm_ops,
724 	},
725 	.probe	= atmel_pdmic_probe,
726 	.remove	= atmel_pdmic_remove,
727 };
728 module_platform_driver(atmel_pdmic_driver);
729 
730 MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");
731 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
732 MODULE_LICENSE("GPL v2");
733