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