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 struct device *dev; 36 int irq; 37 struct snd_pcm_substream *substream; 38 const struct atmel_pdmic_pdata *pdata; 39 }; 40 41 static const struct of_device_id atmel_pdmic_of_match[] = { 42 { 43 .compatible = "atmel,sama5d2-pdmic", 44 }, { 45 /* sentinel */ 46 } 47 }; 48 MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match); 49 50 #define PDMIC_OFFSET_MAX_VAL S16_MAX 51 #define PDMIC_OFFSET_MIN_VAL S16_MIN 52 53 static struct atmel_pdmic_pdata *atmel_pdmic_dt_init(struct device *dev) 54 { 55 struct device_node *np = dev->of_node; 56 struct atmel_pdmic_pdata *pdata; 57 58 if (!np) { 59 dev_err(dev, "device node not found\n"); 60 return ERR_PTR(-EINVAL); 61 } 62 63 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 64 if (!pdata) 65 return ERR_PTR(-ENOMEM); 66 67 if (of_property_read_string(np, "atmel,model", &pdata->card_name)) 68 pdata->card_name = "PDMIC"; 69 70 if (of_property_read_u32(np, "atmel,mic-min-freq", 71 &pdata->mic_min_freq)) { 72 dev_err(dev, "failed to get mic-min-freq\n"); 73 return ERR_PTR(-EINVAL); 74 } 75 76 if (of_property_read_u32(np, "atmel,mic-max-freq", 77 &pdata->mic_max_freq)) { 78 dev_err(dev, "failed to get mic-max-freq\n"); 79 return ERR_PTR(-EINVAL); 80 } 81 82 if (pdata->mic_max_freq < pdata->mic_min_freq) { 83 dev_err(dev, 84 "mic-max-freq should not be less than mic-min-freq\n"); 85 return ERR_PTR(-EINVAL); 86 } 87 88 if (of_property_read_s32(np, "atmel,mic-offset", &pdata->mic_offset)) 89 pdata->mic_offset = 0; 90 91 if (pdata->mic_offset > PDMIC_OFFSET_MAX_VAL) { 92 dev_warn(dev, 93 "mic-offset value %d is larger than the max value %d, the max value is specified\n", 94 pdata->mic_offset, PDMIC_OFFSET_MAX_VAL); 95 pdata->mic_offset = PDMIC_OFFSET_MAX_VAL; 96 } else if (pdata->mic_offset < PDMIC_OFFSET_MIN_VAL) { 97 dev_warn(dev, 98 "mic-offset value %d is less than the min value %d, the min value is specified\n", 99 pdata->mic_offset, PDMIC_OFFSET_MIN_VAL); 100 pdata->mic_offset = PDMIC_OFFSET_MIN_VAL; 101 } 102 103 return pdata; 104 } 105 106 /* cpu dai component */ 107 static int atmel_pdmic_cpu_dai_startup(struct snd_pcm_substream *substream, 108 struct snd_soc_dai *cpu_dai) 109 { 110 struct snd_soc_pcm_runtime *rtd = substream->private_data; 111 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); 112 int ret; 113 114 ret = clk_prepare_enable(dd->gclk); 115 if (ret) 116 return ret; 117 118 ret = clk_prepare_enable(dd->pclk); 119 if (ret) { 120 clk_disable_unprepare(dd->gclk); 121 return ret; 122 } 123 124 /* Clear all bits in the Control Register(PDMIC_CR) */ 125 regmap_write(dd->regmap, PDMIC_CR, 0); 126 127 dd->substream = substream; 128 129 /* Enable the overrun error interrupt */ 130 regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE); 131 132 return 0; 133 } 134 135 static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream, 136 struct snd_soc_dai *cpu_dai) 137 { 138 struct snd_soc_pcm_runtime *rtd = substream->private_data; 139 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); 140 141 /* Disable the overrun error interrupt */ 142 regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE); 143 144 clk_disable_unprepare(dd->gclk); 145 clk_disable_unprepare(dd->pclk); 146 } 147 148 static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream, 149 struct snd_soc_dai *cpu_dai) 150 { 151 struct snd_soc_pcm_runtime *rtd = substream->private_data; 152 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); 153 u32 val; 154 155 /* Clean the PDMIC Converted Data Register */ 156 return regmap_read(dd->regmap, PDMIC_CDR, &val); 157 } 158 159 static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = { 160 .startup = atmel_pdmic_cpu_dai_startup, 161 .shutdown = atmel_pdmic_cpu_dai_shutdown, 162 .prepare = atmel_pdmic_cpu_dai_prepare, 163 }; 164 165 #define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE) 166 167 static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = { 168 .capture = { 169 .channels_min = 1, 170 .channels_max = 1, 171 .rates = SNDRV_PCM_RATE_KNOT, 172 .formats = ATMEL_PDMIC_FORMATS,}, 173 .ops = &atmel_pdmic_cpu_dai_ops, 174 }; 175 176 static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = { 177 .name = "atmel-pdmic", 178 }; 179 180 /* platform */ 181 #define ATMEL_PDMIC_MAX_BUF_SIZE (64 * 1024) 182 #define ATMEL_PDMIC_PREALLOC_BUF_SIZE ATMEL_PDMIC_MAX_BUF_SIZE 183 184 static const struct snd_pcm_hardware atmel_pdmic_hw = { 185 .info = SNDRV_PCM_INFO_MMAP 186 | SNDRV_PCM_INFO_MMAP_VALID 187 | SNDRV_PCM_INFO_INTERLEAVED 188 | SNDRV_PCM_INFO_RESUME 189 | SNDRV_PCM_INFO_PAUSE, 190 .formats = ATMEL_PDMIC_FORMATS, 191 .buffer_bytes_max = ATMEL_PDMIC_MAX_BUF_SIZE, 192 .period_bytes_min = 256, 193 .period_bytes_max = 32 * 1024, 194 .periods_min = 2, 195 .periods_max = 256, 196 }; 197 198 static int 199 atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream, 200 struct snd_pcm_hw_params *params, 201 struct dma_slave_config *slave_config) 202 { 203 struct snd_soc_pcm_runtime *rtd = substream->private_data; 204 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); 205 int ret; 206 207 ret = snd_hwparams_to_dma_slave_config(substream, params, 208 slave_config); 209 if (ret) { 210 dev_err(dd->dev, 211 "hw params to dma slave configure failed\n"); 212 return ret; 213 } 214 215 slave_config->src_addr = dd->phy_base + PDMIC_CDR; 216 slave_config->src_maxburst = 1; 217 slave_config->dst_maxburst = 1; 218 219 return 0; 220 } 221 222 static const struct snd_dmaengine_pcm_config 223 atmel_pdmic_dmaengine_pcm_config = { 224 .prepare_slave_config = atmel_pdmic_platform_configure_dma, 225 .pcm_hardware = &atmel_pdmic_hw, 226 .prealloc_buffer_size = ATMEL_PDMIC_PREALLOC_BUF_SIZE, 227 }; 228 229 /* codec */ 230 /* Mic Gain = dgain * 2^(-scale) */ 231 struct mic_gain { 232 unsigned int dgain; 233 unsigned int scale; 234 }; 235 236 /* range from -90 dB to 90 dB */ 237 static const struct mic_gain mic_gain_table[] = { 238 { 1, 15}, { 1, 14}, /* -90, -84 dB */ 239 { 3, 15}, { 1, 13}, { 3, 14}, { 1, 12}, /* -81, -78, -75, -72 dB */ 240 { 5, 14}, { 13, 15}, /* -70, -68 dB */ 241 { 9, 14}, { 21, 15}, { 23, 15}, { 13, 14}, /* -65 ~ -62 dB */ 242 { 29, 15}, { 33, 15}, { 37, 15}, { 41, 15}, /* -61 ~ -58 dB */ 243 { 23, 14}, { 13, 13}, { 58, 15}, { 65, 15}, /* -57 ~ -54 dB */ 244 { 73, 15}, { 41, 14}, { 23, 13}, { 13, 12}, /* -53 ~ -50 dB */ 245 { 29, 13}, { 65, 14}, { 73, 14}, { 41, 13}, /* -49 ~ -46 dB */ 246 { 23, 12}, { 207, 15}, { 29, 12}, { 65, 13}, /* -45 ~ -42 dB */ 247 { 73, 13}, { 41, 12}, { 23, 11}, { 413, 15}, /* -41 ~ -38 dB */ 248 { 463, 15}, { 519, 15}, { 583, 15}, { 327, 14}, /* -37 ~ -34 dB */ 249 { 367, 14}, { 823, 15}, { 231, 13}, { 1036, 15}, /* -33 ~ -30 dB */ 250 { 1163, 15}, { 1305, 15}, { 183, 12}, { 1642, 15}, /* -29 ~ -26 dB */ 251 { 1843, 15}, { 2068, 15}, { 145, 11}, { 2603, 15}, /* -25 ~ -22 dB */ 252 { 365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */ 253 { 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */ 254 { 917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */ 255 {11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /* -9 ~ -6 dB */ 256 {18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /* -5 ~ -2 dB */ 257 { 7301, 13}, { 1, 0}, {18383, 14}, {10313, 13}, /* -1 ~ 2 dB */ 258 {23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /* 3 ~ 6 dB */ 259 { 4585, 11}, {20577, 13}, { 1443, 9}, {25905, 13}, /* 7 ~ 10 dB */ 260 {14533, 12}, { 8153, 11}, { 2287, 9}, {20529, 12}, /* 11 ~ 14 dB */ 261 {11517, 11}, { 6461, 10}, {28997, 12}, { 4067, 9}, /* 15 ~ 18 dB */ 262 {18253, 11}, { 10, 0}, {22979, 11}, {25783, 11}, /* 19 ~ 22 dB */ 263 {28929, 11}, {32459, 11}, { 9105, 9}, {20431, 10}, /* 23 ~ 26 dB */ 264 {22925, 10}, {12861, 9}, { 7215, 8}, {16191, 9}, /* 27 ~ 30 dB */ 265 { 9083, 8}, {20383, 9}, {11435, 8}, { 6145, 7}, /* 31 ~ 34 dB */ 266 { 3599, 6}, {32305, 9}, {18123, 8}, {20335, 8}, /* 35 ~ 38 dB */ 267 { 713, 3}, { 100, 0}, { 7181, 6}, { 8057, 6}, /* 39 ~ 42 dB */ 268 { 565, 2}, {20287, 7}, {11381, 6}, {25539, 7}, /* 43 ~ 46 dB */ 269 { 1791, 3}, { 4019, 4}, { 9019, 5}, {20239, 6}, /* 47 ~ 50 dB */ 270 { 5677, 4}, {25479, 6}, { 7147, 4}, { 8019, 4}, /* 51 ~ 54 dB */ 271 {17995, 5}, {20191, 5}, {11327, 4}, {12709, 4}, /* 55 ~ 58 dB */ 272 { 3565, 2}, { 1000, 0}, { 1122, 0}, { 1259, 0}, /* 59 ~ 62 dB */ 273 { 2825, 1}, {12679, 3}, { 7113, 2}, { 7981, 2}, /* 63 ~ 66 dB */ 274 { 8955, 2}, {20095, 3}, {22547, 3}, {12649, 2}, /* 67 ~ 70 dB */ 275 {28385, 3}, { 3981, 0}, {17867, 2}, {20047, 2}, /* 71 ~ 74 dB */ 276 {11247, 1}, {12619, 1}, {14159, 1}, {31773, 2}, /* 75 ~ 78 dB */ 277 {17825, 1}, {10000, 0}, {11220, 0}, {12589, 0}, /* 79 ~ 82 dB */ 278 {28251, 1}, {15849, 0}, {17783, 0}, {19953, 0}, /* 83 ~ 86 dB */ 279 {22387, 0}, {25119, 0}, {28184, 0}, {31623, 0}, /* 87 ~ 90 dB */ 280 }; 281 282 static const DECLARE_TLV_DB_RANGE(mic_gain_tlv, 283 0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0), 284 2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0), 285 6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0), 286 8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0), 287 ); 288 289 static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol, 290 struct snd_ctl_elem_value *ucontrol) 291 { 292 struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); 293 unsigned int dgain_val, scale_val; 294 int i; 295 296 dgain_val = (snd_soc_component_read32(component, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK) 297 >> PDMIC_DSPR1_DGAIN_SHIFT; 298 299 scale_val = (snd_soc_component_read32(component, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK) 300 >> PDMIC_DSPR0_SCALE_SHIFT; 301 302 for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) { 303 if ((mic_gain_table[i].dgain == dgain_val) && 304 (mic_gain_table[i].scale == scale_val)) 305 ucontrol->value.integer.value[0] = i; 306 } 307 308 return 0; 309 } 310 311 static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol, 312 struct snd_ctl_elem_value *ucontrol) 313 { 314 struct soc_mixer_control *mc = 315 (struct soc_mixer_control *)kcontrol->private_value; 316 struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol); 317 int max = mc->max; 318 unsigned int val; 319 int ret; 320 321 val = ucontrol->value.integer.value[0]; 322 323 if (val > max) 324 return -EINVAL; 325 326 ret = snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK, 327 mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT); 328 if (ret < 0) 329 return ret; 330 331 ret = snd_soc_component_update_bits(component, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK, 332 mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT); 333 if (ret < 0) 334 return ret; 335 336 return 0; 337 } 338 339 static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = { 340 SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT, 341 ARRAY_SIZE(mic_gain_table)-1, 0, 342 pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv), 343 344 SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0, 345 PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1), 346 347 SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1), 348 }; 349 350 static int atmel_pdmic_component_probe(struct snd_soc_component *component) 351 { 352 struct snd_soc_card *card = snd_soc_component_get_drvdata(component); 353 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); 354 355 snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK, 356 (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT)); 357 358 return 0; 359 } 360 361 static struct snd_soc_component_driver soc_component_dev_pdmic = { 362 .probe = atmel_pdmic_component_probe, 363 .controls = atmel_pdmic_snd_controls, 364 .num_controls = ARRAY_SIZE(atmel_pdmic_snd_controls), 365 .idle_bias_on = 1, 366 .use_pmdown_time = 1, 367 .endianness = 1, 368 .non_legacy_dai_naming = 1, 369 }; 370 371 /* codec dai component */ 372 #define PDMIC_MR_PRESCAL_MAX_VAL 127 373 374 static int 375 atmel_pdmic_codec_dai_hw_params(struct snd_pcm_substream *substream, 376 struct snd_pcm_hw_params *params, 377 struct snd_soc_dai *codec_dai) 378 { 379 struct snd_soc_pcm_runtime *rtd = substream->private_data; 380 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card); 381 struct snd_soc_component *component = codec_dai->component; 382 unsigned int rate_min = substream->runtime->hw.rate_min; 383 unsigned int rate_max = substream->runtime->hw.rate_max; 384 int fs = params_rate(params); 385 int bits = params_width(params); 386 unsigned long pclk_rate, gclk_rate; 387 unsigned int f_pdmic; 388 u32 mr_val, dspr0_val, pclk_prescal, gclk_prescal; 389 390 if (params_channels(params) != 1) { 391 dev_err(component->dev, 392 "only supports one channel\n"); 393 return -EINVAL; 394 } 395 396 if ((fs < rate_min) || (fs > rate_max)) { 397 dev_err(component->dev, 398 "sample rate is %dHz, min rate is %dHz, max rate is %dHz\n", 399 fs, rate_min, rate_max); 400 401 return -EINVAL; 402 } 403 404 switch (bits) { 405 case 16: 406 dspr0_val = (PDMIC_DSPR0_SIZE_16_BITS 407 << PDMIC_DSPR0_SIZE_SHIFT); 408 break; 409 case 32: 410 dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS 411 << PDMIC_DSPR0_SIZE_SHIFT); 412 break; 413 default: 414 return -EINVAL; 415 } 416 417 if ((fs << 7) > (rate_max << 6)) { 418 f_pdmic = fs << 6; 419 dspr0_val |= PDMIC_DSPR0_OSR_64 << PDMIC_DSPR0_OSR_SHIFT; 420 } else { 421 f_pdmic = fs << 7; 422 dspr0_val |= PDMIC_DSPR0_OSR_128 << PDMIC_DSPR0_OSR_SHIFT; 423 } 424 425 pclk_rate = clk_get_rate(dd->pclk); 426 gclk_rate = clk_get_rate(dd->gclk); 427 428 /* PRESCAL = SELCK/(2*f_pdmic) - 1*/ 429 pclk_prescal = (u32)(pclk_rate/(f_pdmic << 1)) - 1; 430 gclk_prescal = (u32)(gclk_rate/(f_pdmic << 1)) - 1; 431 432 if ((pclk_prescal > PDMIC_MR_PRESCAL_MAX_VAL) || 433 (gclk_rate/((gclk_prescal + 1) << 1) < 434 pclk_rate/((pclk_prescal + 1) << 1))) { 435 mr_val = gclk_prescal << PDMIC_MR_PRESCAL_SHIFT; 436 mr_val |= PDMIC_MR_CLKS_GCK << PDMIC_MR_CLKS_SHIFT; 437 } else { 438 mr_val = pclk_prescal << PDMIC_MR_PRESCAL_SHIFT; 439 mr_val |= PDMIC_MR_CLKS_PCK << PDMIC_MR_CLKS_SHIFT; 440 } 441 442 snd_soc_component_update_bits(component, PDMIC_MR, 443 PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val); 444 445 snd_soc_component_update_bits(component, PDMIC_DSPR0, 446 PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val); 447 448 return 0; 449 } 450 451 static int atmel_pdmic_codec_dai_prepare(struct snd_pcm_substream *substream, 452 struct snd_soc_dai *codec_dai) 453 { 454 struct snd_soc_component *component = codec_dai->component; 455 456 snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK, 457 PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT); 458 459 return 0; 460 } 461 462 static int atmel_pdmic_codec_dai_trigger(struct snd_pcm_substream *substream, 463 int cmd, struct snd_soc_dai *codec_dai) 464 { 465 struct snd_soc_component *component = codec_dai->component; 466 u32 val; 467 468 switch (cmd) { 469 case SNDRV_PCM_TRIGGER_START: 470 case SNDRV_PCM_TRIGGER_RESUME: 471 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 472 val = PDMIC_CR_ENPDM_EN << PDMIC_CR_ENPDM_SHIFT; 473 break; 474 case SNDRV_PCM_TRIGGER_STOP: 475 case SNDRV_PCM_TRIGGER_SUSPEND: 476 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 477 val = PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT; 478 break; 479 default: 480 return -EINVAL; 481 } 482 483 snd_soc_component_update_bits(component, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val); 484 485 return 0; 486 } 487 488 static const struct snd_soc_dai_ops atmel_pdmic_codec_dai_ops = { 489 .hw_params = atmel_pdmic_codec_dai_hw_params, 490 .prepare = atmel_pdmic_codec_dai_prepare, 491 .trigger = atmel_pdmic_codec_dai_trigger, 492 }; 493 494 #define ATMEL_PDMIC_CODEC_DAI_NAME "atmel-pdmic-hifi" 495 496 static struct snd_soc_dai_driver atmel_pdmic_codec_dai = { 497 .name = ATMEL_PDMIC_CODEC_DAI_NAME, 498 .capture = { 499 .stream_name = "Capture", 500 .channels_min = 1, 501 .channels_max = 1, 502 .rates = SNDRV_PCM_RATE_KNOT, 503 .formats = ATMEL_PDMIC_FORMATS, 504 }, 505 .ops = &atmel_pdmic_codec_dai_ops, 506 }; 507 508 /* ASoC sound card */ 509 static int atmel_pdmic_asoc_card_init(struct device *dev, 510 struct snd_soc_card *card) 511 { 512 struct snd_soc_dai_link *dai_link; 513 struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card); 514 515 dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL); 516 if (!dai_link) 517 return -ENOMEM; 518 519 dai_link->name = "PDMIC"; 520 dai_link->stream_name = "PDMIC PCM"; 521 dai_link->codec_dai_name = ATMEL_PDMIC_CODEC_DAI_NAME; 522 dai_link->cpu_dai_name = dev_name(dev); 523 dai_link->codec_name = dev_name(dev); 524 dai_link->platform_name = dev_name(dev); 525 526 card->dai_link = dai_link; 527 card->num_links = 1; 528 card->name = dd->pdata->card_name; 529 card->dev = dev; 530 531 return 0; 532 } 533 534 static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd, 535 unsigned int *rate_min, unsigned int *rate_max) 536 { 537 u32 mic_min_freq = dd->pdata->mic_min_freq; 538 u32 mic_max_freq = dd->pdata->mic_max_freq; 539 u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1); 540 u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8); 541 542 if (mic_max_freq > clk_max_rate) 543 mic_max_freq = clk_max_rate; 544 545 if (mic_min_freq < clk_min_rate) 546 mic_min_freq = clk_min_rate; 547 548 *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128); 549 *rate_max = mic_max_freq >> 6; 550 } 551 552 /* PDMIC interrupt handler */ 553 static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id) 554 { 555 struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id; 556 u32 pdmic_isr; 557 irqreturn_t ret = IRQ_NONE; 558 559 regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr); 560 561 if (pdmic_isr & PDMIC_ISR_OVRE) { 562 regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK, 563 PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT); 564 565 snd_pcm_stop_xrun(dd->substream); 566 567 ret = IRQ_HANDLED; 568 } 569 570 return ret; 571 } 572 573 /* regmap configuration */ 574 #define ATMEL_PDMIC_REG_MAX 0x124 575 static const struct regmap_config atmel_pdmic_regmap_config = { 576 .reg_bits = 32, 577 .reg_stride = 4, 578 .val_bits = 32, 579 .max_register = ATMEL_PDMIC_REG_MAX, 580 }; 581 582 static int atmel_pdmic_probe(struct platform_device *pdev) 583 { 584 struct device *dev = &pdev->dev; 585 struct atmel_pdmic *dd; 586 struct resource *res; 587 void __iomem *io_base; 588 const struct atmel_pdmic_pdata *pdata; 589 struct snd_soc_card *card; 590 unsigned int rate_min, rate_max; 591 int ret; 592 593 pdata = atmel_pdmic_dt_init(dev); 594 if (IS_ERR(pdata)) 595 return PTR_ERR(pdata); 596 597 dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL); 598 if (!dd) 599 return -ENOMEM; 600 601 dd->pdata = pdata; 602 dd->dev = dev; 603 604 dd->irq = platform_get_irq(pdev, 0); 605 if (dd->irq < 0) { 606 ret = dd->irq; 607 dev_err(dev, "failed to get irq: %d\n", ret); 608 return ret; 609 } 610 611 dd->pclk = devm_clk_get(dev, "pclk"); 612 if (IS_ERR(dd->pclk)) { 613 ret = PTR_ERR(dd->pclk); 614 dev_err(dev, "failed to get peripheral clock: %d\n", ret); 615 return ret; 616 } 617 618 dd->gclk = devm_clk_get(dev, "gclk"); 619 if (IS_ERR(dd->gclk)) { 620 ret = PTR_ERR(dd->gclk); 621 dev_err(dev, "failed to get GCK: %d\n", ret); 622 return ret; 623 } 624 625 /* The gclk clock frequency must always be three times 626 * lower than the pclk clock frequency 627 */ 628 ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3); 629 if (ret) { 630 dev_err(dev, "failed to set GCK clock rate: %d\n", ret); 631 return ret; 632 } 633 634 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 635 io_base = devm_ioremap_resource(dev, res); 636 if (IS_ERR(io_base)) 637 return PTR_ERR(io_base); 638 639 dd->phy_base = res->start; 640 641 dd->regmap = devm_regmap_init_mmio(dev, io_base, 642 &atmel_pdmic_regmap_config); 643 if (IS_ERR(dd->regmap)) { 644 ret = PTR_ERR(dd->regmap); 645 dev_err(dev, "failed to init register map: %d\n", ret); 646 return ret; 647 } 648 649 ret = devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0, 650 "PDMIC", (void *)dd); 651 if (ret < 0) { 652 dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n", 653 dd->irq, ret); 654 return ret; 655 } 656 657 /* Get the minimal and maximal sample rate that the microphone supports */ 658 atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max); 659 660 /* register cpu dai */ 661 atmel_pdmic_cpu_dai.capture.rate_min = rate_min; 662 atmel_pdmic_cpu_dai.capture.rate_max = rate_max; 663 ret = devm_snd_soc_register_component(dev, 664 &atmel_pdmic_cpu_dai_component, 665 &atmel_pdmic_cpu_dai, 1); 666 if (ret) { 667 dev_err(dev, "could not register CPU DAI: %d\n", ret); 668 return ret; 669 } 670 671 /* register platform */ 672 ret = devm_snd_dmaengine_pcm_register(dev, 673 &atmel_pdmic_dmaengine_pcm_config, 674 0); 675 if (ret) { 676 dev_err(dev, "could not register platform: %d\n", ret); 677 return ret; 678 } 679 680 /* register codec and codec dai */ 681 atmel_pdmic_codec_dai.capture.rate_min = rate_min; 682 atmel_pdmic_codec_dai.capture.rate_max = rate_max; 683 ret = devm_snd_soc_register_component(dev, &soc_component_dev_pdmic, 684 &atmel_pdmic_codec_dai, 1); 685 if (ret) { 686 dev_err(dev, "could not register component: %d\n", ret); 687 return ret; 688 } 689 690 /* register sound card */ 691 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL); 692 if (!card) { 693 ret = -ENOMEM; 694 goto unregister_codec; 695 } 696 697 snd_soc_card_set_drvdata(card, dd); 698 699 ret = atmel_pdmic_asoc_card_init(dev, card); 700 if (ret) { 701 dev_err(dev, "failed to init sound card: %d\n", ret); 702 goto unregister_codec; 703 } 704 705 ret = devm_snd_soc_register_card(dev, card); 706 if (ret) { 707 dev_err(dev, "failed to register sound card: %d\n", ret); 708 goto unregister_codec; 709 } 710 711 return 0; 712 713 unregister_codec: 714 return ret; 715 } 716 717 static int atmel_pdmic_remove(struct platform_device *pdev) 718 { 719 return 0; 720 } 721 722 static struct platform_driver atmel_pdmic_driver = { 723 .driver = { 724 .name = "atmel-pdmic", 725 .of_match_table = of_match_ptr(atmel_pdmic_of_match), 726 .pm = &snd_soc_pm_ops, 727 }, 728 .probe = atmel_pdmic_probe, 729 .remove = atmel_pdmic_remove, 730 }; 731 module_platform_driver(atmel_pdmic_driver); 732 733 MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture"); 734 MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>"); 735 MODULE_LICENSE("GPL v2"); 736