1 /* Atmel PDMIC driver 2 * 3 * Copyright (C) 2015 Atmel 4 * 5 * Author: Songjun Wu <songjun.wu@atmel.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 or later 9 * as published by the Free Software Foundation. 10 */ 11 12 #include <linux/of.h> 13 #include <linux/clk.h> 14 #include <linux/module.h> 15 #include <linux/platform_device.h> 16 #include <linux/regmap.h> 17 #include <sound/core.h> 18 #include <sound/dmaengine_pcm.h> 19 #include <sound/pcm_params.h> 20 #include <sound/tlv.h> 21 #include "atmel-pdmic.h" 22 23 struct atmel_pdmic_pdata { 24 u32 mic_min_freq; 25 u32 mic_max_freq; 26 s32 mic_offset; 27 const char *card_name; 28 }; 29 30 struct atmel_pdmic { 31 dma_addr_t phy_base; 32 struct regmap *regmap; 33 struct clk *pclk; 34 struct clk *gclk; 35 int irq; 36 struct snd_pcm_substream *substream; 37 const struct atmel_pdmic_pdata *pdata; 38 }; 39 40 static const struct of_device_id atmel_pdmic_of_match[] = { 41 { 42 .compatible = "atmel,sama5d2-pdmic", 43 }, { 44 /* sentinel */ 45 } 46 }; 47 MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match); 48 49 #define PDMIC_OFFSET_MAX_VAL S16_MAX 50 #define PDMIC_OFFSET_MIN_VAL S16_MIN 51 52 static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev) 53 { 54 struct device_node *np = dev->of_node; 55 struct atmel_pdmic_pdata *pdata; 56 57 if (!np) { 58 dev_err(dev, "device node not found\n"); 59 return ERR_PTR(-EINVAL); 60 } 61 62 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 63 if (!pdata) 64 return ERR_PTR(-ENOMEM); 65 66 if (of_property_read_string(np, "atmel,model", &pdata->card_name)) 67 pdata->card_name = "PDMIC"; 68 69 if (of_property_read_u32(np, "atmel,mic-min-freq", 70 &pdata->mic_min_freq)) { 71 dev_err(dev, "failed to get mic-min-freq\n"); 72 return ERR_PTR(-EINVAL); 73 } 74 75 if (of_property_read_u32(np, "atmel,mic-max-freq", 76 &pdata->mic_max_freq)) { 77 dev_err(dev, "failed to get mic-max-freq\n"); 78 return ERR_PTR(-EINVAL); 79 } 80 81 if (pdata->mic_max_freq < pdata->mic_min_freq) { 82 dev_err(dev, 83 "mic-max-freq should not less than mic-min-freq\n"); 84 return ERR_PTR(-EINVAL); 85 } 86 87 if (of_property_read_s32(np, "atmel,mic-offset", &pdata->mic_offset)) 88 pdata->mic_offset = 0; 89 90 if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) { 91 dev_warn(dev, 92 "mic-offset value %d is larger than the max value %d, the max value is specified\n", 93 pdata->mic_offset, PDMIC_OFFSET_MAX_VAL); 94 pdata->mic_offset = PDMIC_OFFSET_MAX_VAL; 95 } else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) { 96 dev_warn(dev, 97 "mic-offset value %d is less than the min value %d, the min value is specified\n", 98 pdata->mic_offset, PDMIC_OFFSET_MIN_VAL); 99 pdata->mic_offset = PDMIC_OFFSET_MIN_VAL; 100 } 101 102 return pdata; 103 } 104 105 /* cpu dai component */ 106 static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream, 107 struct snd_soc_dai *cpu_dai) 108 { 109 struct snd_soc_pcm_runtime *rtd = substream->private_data; 110 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); 111 int ret; 112 113 ret = clk_prepare_enable(dd->gclk); 114 if (ret) 115 return ret; 116 117 ret = clk_prepare_enable(dd->pclk); 118 if (ret) 119 return ret; 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(rtd->platform->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 int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol, 287 struct snd_ctl_elem_value *ucontrol) 288 { 289 struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol); 290 unsigned int dgain_val, scale_val; 291 int i; 292 293 dgain_val = (snd_soc_read(codec, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK) 294 >> PDMIC_DSPR1_DGAIN_SHIFT; 295 296 scale_val = (snd_soc_read(codec, 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_codec *codec = snd_soc_kcontrol_codec(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_update_bits(codec, 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_update_bits(codec, 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_codec_probe(struct snd_soc_codec *codec) 348 { 349 struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec); 350 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); 351 352 snd_soc_update_bits(codec, 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_codec_driver soc_codec_dev_pdmic = { 359 .probe = atmel_pdmic_codec_probe, 360 .controls = atmel_pdmic_snd_controls, 361 .num_controls = ARRAY_SIZE(atmel_pdmic_snd_controls), 362 }; 363 364 /* codec dai component */ 365 #define PDMIC_MR_PRESCAL_MAX_VAL 127 366 367 static int 368 atmel_pdmic_codec_dai_hw_params(struct snd_pcm_substream *substream, 369 struct snd_pcm_hw_params *params, 370 struct snd_soc_dai *codec_dai) 371 { 372 struct snd_soc_pcm_runtime *rtd = substream->private_data; 373 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); 374 struct snd_soc_codec *codec = codec_dai->codec; 375 unsigned int rate_min = substream->runtime->hw.rate_min; 376 unsigned int rate_max = substream->runtime->hw.rate_max; 377 int fs = params_rate(params); 378 int bits = params_width(params); 379 unsigned long pclk_rate, gclk_rate; 380 unsigned int f_pdmic; 381 u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal; 382 383 if (params_channels(params) != 1) { 384 dev_err(codec->dev, 385 "only supports one channel\n"); 386 return -EINVAL; 387 } 388 389 if ((fs < rate_min) || (fs > rate_max)) { 390 dev_err(codec->dev, 391 "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n", 392 fs, rate_min, rate_max); 393 394 return -EINVAL; 395 } 396 397 switch (bits) { 398 case 16: 399 dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS 400 << PDMIC_DSPR0_SIZE_SHIFT); 401 break; 402 case 32: 403 dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS 404 << PDMIC_DSPR0_SIZE_SHIFT); 405 break; 406 default: 407 return -EINVAL; 408 } 409 410 if ((fs << 7) > (rate_max << 6)) { 411 f_pdmic = fs << 6; 412 dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT; 413 } else { 414 f_pdmic = fs << 7; 415 dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT; 416 } 417 418 pclk_rate = clk_get_rate(dd->pclk); 419 gclk_rate = clk_get_rate(dd->gclk); 420 421 /* PRESCAL = SELCK/(2*f_pdmic) - 1*/ 422 pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1; 423 gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1; 424 425 if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) || 426 (gclk_rate/((gclk_prescal + 1) << 1) < 427 pclk_rate/((pclk_prescal + 1) << 1))) { 428 mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT; 429 mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT; 430 } else { 431 mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT; 432 mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT; 433 } 434 435 snd_soc_update_bits(codec, PDMIC_MR, 436 PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val); 437 438 snd_soc_update_bits(codec, PDMIC_DSPR0, 439 PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val); 440 441 return 0; 442 } 443 444 static int atmel_pdmic_codec_dai_prepare(struct snd_pcm_substream *substream, 445 struct snd_soc_dai *codec_dai) 446 { 447 struct snd_soc_codec *codec = codec_dai->codec; 448 449 snd_soc_update_bits(codec, PDMIC_CR, PDMIC_CR_ENPDM_MASK, 450 PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT); 451 452 return 0; 453 } 454 455 static int atmel_pdmic_codec_dai_trigger(struct snd_pcm_substream *substream, 456 int cmd, struct snd_soc_dai *codec_dai) 457 { 458 struct snd_soc_codec *codec = codec_dai->codec; 459 u32 val; 460 461 switch (cmd) { 462 case SNDRV_PCM_TRIGGER_START: 463 case SNDRV_PCM_TRIGGER_RESUME: 464 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 465 val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT; 466 break; 467 case SNDRV_PCM_TRIGGER_STOP: 468 case SNDRV_PCM_TRIGGER_SUSPEND: 469 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 470 val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT; 471 break; 472 default: 473 return -EINVAL; 474 } 475 476 snd_soc_update_bits(codec, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val); 477 478 return 0; 479 } 480 481 static const struct snd_soc_dai_ops atmel_pdmic_codec_dai_ops = { 482 .hw_params = atmel_pdmic_codec_dai_hw_params, 483 .prepare = atmel_pdmic_codec_dai_prepare, 484 .trigger = atmel_pdmic_codec_dai_trigger, 485 }; 486 487 #define ATMEL_PDMIC_CODEC_DAI_NAME "atmel-pdmic-hifi" 488 489 static struct snd_soc_dai_driver atmel_pdmic_codec_dai = { 490 .name = ATMEL_PDMIC_CODEC_DAI_NAME, 491 .capture = { 492 .stream_name = "Capture", 493 .channels_min = 1, 494 .channels_max = 1, 495 .rates = SNDRV_PCM_RATE_KNOT, 496 .formats = ATMEL_PDMIC_FORMATS, 497 }, 498 .ops = &atmel_pdmic_codec_dai_ops, 499 }; 500 501 /* ASoC sound card */ 502 static int atmel_pdmic_asoc_card_init(struct device *dev, 503 struct snd_soc_card *card) 504 { 505 struct snd_soc_dai_link *dai_link; 506 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); 507 508 dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL); 509 if (!dai_link) 510 return -ENOMEM; 511 512 dai_link->name = "PDMIC"; 513 dai_link->stream_name = "PDMIC PCM"; 514 dai_link->codec_dai_name = ATMEL_PDMIC_CODEC_DAI_NAME; 515 dai_link->cpu_dai_name = dev_name(dev); 516 dai_link->codec_name = dev_name(dev); 517 dai_link->platform_name = dev_name(dev); 518 519 card->dai_link = dai_link; 520 card->num_links = 1; 521 card->name = dd->pdata->card_name; 522 card->dev = dev; 523 524 return 0; 525 } 526 527 static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd, 528 unsigned int *rate_min, unsigned int *rate_max) 529 { 530 u32 mic_min_freq = dd->pdata->mic_min_freq; 531 u32 mic_max_freq = dd->pdata->mic_max_freq; 532 u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1); 533 u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8); 534 535 if (mic_max_freq > clk_max_rate) 536 mic_max_freq = clk_max_rate; 537 538 if (mic_min_freq < clk_min_rate) 539 mic_min_freq = clk_min_rate; 540 541 *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128); 542 *rate_max = mic_max_freq >> 6; 543 } 544 545 /* PDMIC interrupt handler */ 546 static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id) 547 { 548 struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id; 549 u32 pdmic_isr; 550 irqreturn_t ret = IRQ_NONE; 551 552 regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr); 553 554 if (pdmic_isr & PDMIC_ISR_OVRE) { 555 regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK, 556 PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT); 557 558 snd_pcm_stop_xrun(dd->substream); 559 560 ret = IRQ_HANDLED; 561 } 562 563 return ret; 564 } 565 566 /* regmap configuration */ 567 #define ATMEL_PDMIC_REG_MAX 0x124 568 static const struct regmap_config atmel_pdmic_regmap_config = { 569 .reg_bits = 32, 570 .reg_stride = 4, 571 .val_bits = 32, 572 .max_register = ATMEL_PDMIC_REG_MAX, 573 }; 574 575 static int atmel_pdmic_probe(struct platform_device *pdev) 576 { 577 struct device *dev = &pdev->dev; 578 struct atmel_pdmic *dd; 579 struct resource *res; 580 void __iomem *io_base; 581 const struct atmel_pdmic_pdata *pdata; 582 struct snd_soc_card *card; 583 unsigned int rate_min, rate_max; 584 int ret; 585 586 pdata = atmel_pdmic_dt_init(dev); 587 if (IS_ERR(pdata)) 588 return PTR_ERR(pdata); 589 590 dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL); 591 if (!dd) 592 return -ENOMEM; 593 594 dd->pdata = pdata; 595 596 dd->irq = platform_get_irq(pdev, 0); 597 if (dd->irq < 0) { 598 ret = dd->irq; 599 dev_err(dev, "failed to could not get irq: %d\n", ret); 600 return ret; 601 } 602 603 dd->pclk = devm_clk_get(dev, "pclk"); 604 if (IS_ERR(dd->pclk)) { 605 ret = PTR_ERR(dd->pclk); 606 dev_err(dev, "failed to get peripheral clock: %d\n", ret); 607 return ret; 608 } 609 610 dd->gclk = devm_clk_get(dev, "gclk"); 611 if (IS_ERR(dd->gclk)) { 612 ret = PTR_ERR(dd->gclk); 613 dev_err(dev, "failed to get GCK: %d\n", ret); 614 return ret; 615 } 616 617 /* The gclk clock frequency must always be tree times 618 * lower than the pclk clock frequency 619 */ 620 ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3); 621 if (ret) { 622 dev_err(dev, "failed to set GCK clock rate: %d\n", ret); 623 return ret; 624 } 625 626 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 627 io_base = devm_ioremap_resource(dev, res); 628 if (IS_ERR(io_base)) { 629 ret = PTR_ERR(io_base); 630 dev_err(dev, "failed to remap register memory: %d\n", ret); 631 return ret; 632 } 633 634 dd->phy_base = res->start; 635 636 dd->regmap = devm_regmap_init_mmio(dev, io_base, 637 &atmel_pdmic_regmap_config); 638 if (IS_ERR(dd->regmap)) { 639 ret = PTR_ERR(dd->regmap); 640 dev_err(dev, "failed to init register map: %d\n", ret); 641 return ret; 642 } 643 644 ret = devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0, 645 "PDMIC", (void *)dd); 646 if (ret < 0) { 647 dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n", 648 dd->irq, ret); 649 return ret; 650 } 651 652 /* Get the minimal and maximal sample rate that micphone supports */ 653 atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max); 654 655 /* register cpu dai */ 656 atmel_pdmic_cpu_dai.capture.rate_min = rate_min; 657 atmel_pdmic_cpu_dai.capture.rate_max = rate_max; 658 ret = devm_snd_soc_register_component(dev, 659 &atmel_pdmic_cpu_dai_component, 660 &atmel_pdmic_cpu_dai, 1); 661 if (ret) { 662 dev_err(dev, "could not register CPU DAI: %d\n", ret); 663 return ret; 664 } 665 666 /* register platform */ 667 ret = devm_snd_dmaengine_pcm_register(dev, 668 &atmel_pdmic_dmaengine_pcm_config, 669 0); 670 if (ret) { 671 dev_err(dev, "could not register platform: %d\n", ret); 672 return ret; 673 } 674 675 /* register codec and codec dai */ 676 atmel_pdmic_codec_dai.capture.rate_min = rate_min; 677 atmel_pdmic_codec_dai.capture.rate_max = rate_max; 678 ret = snd_soc_register_codec(dev, &soc_codec_dev_pdmic, 679 &atmel_pdmic_codec_dai, 1); 680 if (ret) { 681 dev_err(dev, "could not register codec: %d\n", ret); 682 return ret; 683 } 684 685 /* register sound card */ 686 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL); 687 if (!card) { 688 ret = -ENOMEM; 689 goto unregister_codec; 690 } 691 692 snd_soc_card_set_drvdata(card, dd); 693 platform_set_drvdata(pdev, card); 694 695 ret = atmel_pdmic_asoc_card_init(dev, card); 696 if (ret) { 697 dev_err(dev, "failed to init sound card: %d\n", ret); 698 goto unregister_codec; 699 } 700 701 ret = devm_snd_soc_register_card(dev, card); 702 if (ret) { 703 dev_err(dev, "failed to register sound card: %d\n", ret); 704 goto unregister_codec; 705 } 706 707 return 0; 708 709 unregister_codec: 710 snd_soc_unregister_codec(dev); 711 return ret; 712 } 713 714 static int atmel_pdmic_remove(struct platform_device *pdev) 715 { 716 snd_soc_unregister_codec(&pdev->dev); 717 return 0; 718 } 719 720 static struct platform_driver atmel_pdmic_driver = { 721 .driver = { 722 .name = "atmel-pdmic", 723 .of_match_table = of_match_ptr(atmel_pdmic_of_match), 724 .pm = &snd_soc_pm_ops, 725 }, 726 .probe = atmel_pdmic_probe, 727 .remove = atmel_pdmic_remove, 728 }; 729 module_platform_driver(atmel_pdmic_driver); 730 731 MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture"); 732 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>"); 733 MODULE_LICENSE("GPL v2"); 734