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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / sound / soc / atmel / atmel-pdmic.c
blob04ec6f0af17987851a456d0b82a13aa434767e67
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 struct snd_soc_dai_link_component *comp;
512
513 dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
514 if (!dai_link)
515 return -ENOMEM;
516
517 comp = devm_kzalloc(dev, 3 * sizeof(*comp), GFP_KERNEL);
518 if (!comp)
519 return -ENOMEM;
520
521 dai_link->cpus = &comp[0];
522 dai_link->codecs = &comp[1];
523 dai_link->platforms = &comp[2];
524
525 dai_link->num_cpus = 1;
526 dai_link->num_codecs = 1;
527 dai_link->num_platforms = 1;
528
529 dai_link->name = "PDMIC";
530 dai_link->stream_name = "PDMIC PCM";
531 dai_link->codecs->dai_name = ATMEL_PDMIC_CODEC_DAI_NAME;
532 dai_link->cpus->dai_name = dev_name(dev);
533 dai_link->codecs->name = dev_name(dev);
534 dai_link->platforms->name = dev_name(dev);
535
536 card->dai_link = dai_link;
537 card->num_links = 1;
538 card->name = dd->pdata->card_name;
539 card->dev = dev;
540
541 return 0;
542 }
543
544 static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,
545 unsigned int *rate_min, unsigned int *rate_max)
546 {
547 u32 mic_min_freq = dd->pdata->mic_min_freq;
548 u32 mic_max_freq = dd->pdata->mic_max_freq;
549 u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);
550 u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);
551
552 if (mic_max_freq > clk_max_rate)
553 mic_max_freq = clk_max_rate;
554
555 if (mic_min_freq < clk_min_rate)
556 mic_min_freq = clk_min_rate;
557
558 *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);
559 *rate_max = mic_max_freq >> 6;
560 }
561
562 /* PDMIC interrupt handler */
563 static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)
564 {
565 struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;
566 u32 pdmic_isr;
567 irqreturn_t ret = IRQ_NONE;
568
569 regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);
570
571 if (pdmic_isr & PDMIC_ISR_OVRE) {
572 regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
573 PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
574
575 snd_pcm_stop_xrun(dd->substream);
576
577 ret = IRQ_HANDLED;
578 }
579
580 return ret;
581 }
582
583 /* regmap configuration */
584 #define ATMEL_PDMIC_REG_MAX 0x124
585 static const struct regmap_config atmel_pdmic_regmap_config = {
586 .reg_bits = 32,
587 .reg_stride = 4,
588 .val_bits = 32,
589 .max_register = ATMEL_PDMIC_REG_MAX,
590 };
591
592 static int atmel_pdmic_probe(struct platform_device *pdev)
593 {
594 struct device *dev = &pdev->dev;
595 struct atmel_pdmic *dd;
596 struct resource *res;
597 void __iomem *io_base;
598 const struct atmel_pdmic_pdata *pdata;
599 struct snd_soc_card *card;
600 unsigned int rate_min, rate_max;
601 int ret;
602
603 pdata = atmel_pdmic_dt_init(dev);
604 if (IS_ERR(pdata))
605 return PTR_ERR(pdata);
606
607 dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
608 if (!dd)
609 return -ENOMEM;
610
611 dd->pdata = pdata;
612 dd->dev = dev;
613
614 dd->irq = platform_get_irq(pdev, 0);
615 if (dd->irq < 0)
616 return dd->irq;
617
618 dd->pclk = devm_clk_get(dev, "pclk");
619 if (IS_ERR(dd->pclk)) {
620 ret = PTR_ERR(dd->pclk);
621 dev_err(dev, "failed to get peripheral clock: %d\n", ret);
622 return ret;
623 }
624
625 dd->gclk = devm_clk_get(dev, "gclk");
626 if (IS_ERR(dd->gclk)) {
627 ret = PTR_ERR(dd->gclk);
628 dev_err(dev, "failed to get GCK: %d\n", ret);
629 return ret;
630 }
631
632 /* The gclk clock frequency must always be three times
633 * lower than the pclk clock frequency
634 */
635 ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);
636 if (ret) {
637 dev_err(dev, "failed to set GCK clock rate: %d\n", ret);
638 return ret;
639 }
640
641 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
642 io_base = devm_ioremap_resource(dev, res);
643 if (IS_ERR(io_base))
644 return PTR_ERR(io_base);
645
646 dd->phy_base = res->start;
647
648 dd->regmap = devm_regmap_init_mmio(dev, io_base,
649 &atmel_pdmic_regmap_config);
650 if (IS_ERR(dd->regmap)) {
651 ret = PTR_ERR(dd->regmap);
652 dev_err(dev, "failed to init register map: %d\n", ret);
653 return ret;
654 }
655
656 ret = devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,
657 "PDMIC", (void *)dd);
658 if (ret < 0) {
659 dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
660 dd->irq, ret);
661 return ret;
662 }
663
664 /* Get the minimal and maximal sample rate that the microphone supports */
665 atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);
666
667 /* register cpu dai */
668 atmel_pdmic_cpu_dai.capture.rate_min = rate_min;
669 atmel_pdmic_cpu_dai.capture.rate_max = rate_max;
670 ret = devm_snd_soc_register_component(dev,
671 &atmel_pdmic_cpu_dai_component,
672 &atmel_pdmic_cpu_dai, 1);
673 if (ret) {
674 dev_err(dev, "could not register CPU DAI: %d\n", ret);
675 return ret;
676 }
677
678 /* register platform */
679 ret = devm_snd_dmaengine_pcm_register(dev,
680 &atmel_pdmic_dmaengine_pcm_config,
681 0);
682 if (ret) {
683 dev_err(dev, "could not register platform: %d\n", ret);
684 return ret;
685 }
686
687 /* register codec and codec dai */
688 atmel_pdmic_codec_dai.capture.rate_min = rate_min;
689 atmel_pdmic_codec_dai.capture.rate_max = rate_max;
690 ret = devm_snd_soc_register_component(dev, &soc_component_dev_pdmic,
691 &atmel_pdmic_codec_dai, 1);
692 if (ret) {
693 dev_err(dev, "could not register component: %d\n", ret);
694 return ret;
695 }
696
697 /* register sound card */
698 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
699 if (!card) {
700 ret = -ENOMEM;
701 goto unregister_codec;
702 }
703
704 snd_soc_card_set_drvdata(card, dd);
705
706 ret = atmel_pdmic_asoc_card_init(dev, card);
707 if (ret) {
708 dev_err(dev, "failed to init sound card: %d\n", ret);
709 goto unregister_codec;
710 }
711
712 ret = devm_snd_soc_register_card(dev, card);
713 if (ret) {
714 dev_err(dev, "failed to register sound card: %d\n", ret);
715 goto unregister_codec;
716 }
717
718 return 0;
719
720 unregister_codec:
721 return ret;
722 }
723
724 static int atmel_pdmic_remove(struct platform_device *pdev)
725 {
726 return 0;
727 }
728
729 static struct platform_driver atmel_pdmic_driver = {
730 .driver = {
731 .name = "atmel-pdmic",
732 .of_match_table = of_match_ptr(atmel_pdmic_of_match),
733 .pm = &snd_soc_pm_ops,
734 },
735 .probe = atmel_pdmic_probe,
736 .remove = atmel_pdmic_remove,
737 };
738 module_platform_driver(atmel_pdmic_driver);
739
740 MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");
741 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
742 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support