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1// SPDX-License-Identifier: GPL-2.0-or-later2/* Atmel PDMIC driver3 *4 * Copyright (C) 2015 Atmel5 *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 20struct atmel_pdmic_pdata {21 u32 mic_min_freq;22 u32 mic_max_freq;23 s32 mic_offset;24 const char *card_name;25};26 27struct 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 38static const struct of_device_id atmel_pdmic_of_match[] = {39 {40 .compatible = "atmel,sama5d2-pdmic",41 }, {42 /* sentinel */43 }44};45MODULE_DEVICE_TABLE(of, atmel_pdmic_of_match);46 47#define PDMIC_OFFSET_MAX_VAL S16_MAX48#define PDMIC_OFFSET_MIN_VAL S16_MIN49 50static 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 */104static 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 = snd_soc_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 132static 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 = snd_soc_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 145static 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 = snd_soc_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_SIZE174 175static const struct snd_pcm_hardware atmel_pdmic_hw = {176 .info = SNDRV_PCM_INFO_MMAP177 | SNDRV_PCM_INFO_MMAP_VALID178 | SNDRV_PCM_INFO_INTERLEAVED179 | SNDRV_PCM_INFO_RESUME180 | 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 189static int190atmel_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 = snd_soc_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 213static const struct snd_dmaengine_pcm_config214atmel_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) */222struct mic_gain {223 unsigned int dgain;224 unsigned int scale;225};226 227/* range from -90 dB to 90 dB */228static 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 273static 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 280static 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 302static 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 330static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {331SOC_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 335SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,336 PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),337 338SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),339};340 341static 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 127353 354static int355atmel_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 = snd_soc_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_BITS387 << PDMIC_DSPR0_SIZE_SHIFT);388 break;389 case 32:390 dspr0_val = (PDMIC_DSPR0_SIZE_32_BITS391 << 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 431static 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 457static 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 466static 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 477static 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 */488static 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, sizeof(*comp), GFP_KERNEL);500 if (!comp)501 return -ENOMEM;502 503 dai_link->cpus = comp;504 dai_link->codecs = &snd_soc_dummy_dlc;505 506 dai_link->num_cpus = 1;507 dai_link->num_codecs = 1;508 509 dai_link->name = "PDMIC";510 dai_link->stream_name = "PDMIC PCM";511 dai_link->cpus->dai_name = dev_name(dev);512 513 card->dai_link = dai_link;514 card->num_links = 1;515 card->name = dd->pdata->card_name;516 card->dev = dev;517 518 return 0;519}520 521static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,522 unsigned int *rate_min, unsigned int *rate_max)523{524 u32 mic_min_freq = dd->pdata->mic_min_freq;525 u32 mic_max_freq = dd->pdata->mic_max_freq;526 u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);527 u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);528 529 if (mic_max_freq > clk_max_rate)530 mic_max_freq = clk_max_rate;531 532 if (mic_min_freq < clk_min_rate)533 mic_min_freq = clk_min_rate;534 535 *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);536 *rate_max = mic_max_freq >> 6;537}538 539/* PDMIC interrupt handler */540static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)541{542 struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;543 u32 pdmic_isr;544 irqreturn_t ret = IRQ_NONE;545 546 regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);547 548 if (pdmic_isr & PDMIC_ISR_OVRE) {549 regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,550 PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);551 552 snd_pcm_stop_xrun(dd->substream);553 554 ret = IRQ_HANDLED;555 }556 557 return ret;558}559 560/* regmap configuration */561#define ATMEL_PDMIC_REG_MAX 0x124562static const struct regmap_config atmel_pdmic_regmap_config = {563 .reg_bits = 32,564 .reg_stride = 4,565 .val_bits = 32,566 .max_register = ATMEL_PDMIC_REG_MAX,567};568 569static int atmel_pdmic_probe(struct platform_device *pdev)570{571 struct device *dev = &pdev->dev;572 struct atmel_pdmic *dd;573 struct resource *res;574 void __iomem *io_base;575 const struct atmel_pdmic_pdata *pdata;576 struct snd_soc_card *card;577 unsigned int rate_min, rate_max;578 int ret;579 580 pdata = atmel_pdmic_dt_init(dev);581 if (IS_ERR(pdata))582 return PTR_ERR(pdata);583 584 dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);585 if (!dd)586 return -ENOMEM;587 588 dd->pdata = pdata;589 dd->dev = dev;590 591 dd->irq = platform_get_irq(pdev, 0);592 if (dd->irq < 0)593 return dd->irq;594 595 dd->pclk = devm_clk_get(dev, "pclk");596 if (IS_ERR(dd->pclk)) {597 ret = PTR_ERR(dd->pclk);598 dev_err(dev, "failed to get peripheral clock: %d\n", ret);599 return ret;600 }601 602 dd->gclk = devm_clk_get(dev, "gclk");603 if (IS_ERR(dd->gclk)) {604 ret = PTR_ERR(dd->gclk);605 dev_err(dev, "failed to get GCK: %d\n", ret);606 return ret;607 }608 609 /* The gclk clock frequency must always be three times610 * lower than the pclk clock frequency611 */612 ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);613 if (ret) {614 dev_err(dev, "failed to set GCK clock rate: %d\n", ret);615 return ret;616 }617 618 io_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);619 if (IS_ERR(io_base))620 return PTR_ERR(io_base);621 622 dd->phy_base = res->start;623 624 dd->regmap = devm_regmap_init_mmio(dev, io_base,625 &atmel_pdmic_regmap_config);626 if (IS_ERR(dd->regmap)) {627 ret = PTR_ERR(dd->regmap);628 dev_err(dev, "failed to init register map: %d\n", ret);629 return ret;630 }631 632 ret = devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,633 "PDMIC", (void *)dd);634 if (ret < 0) {635 dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",636 dd->irq, ret);637 return ret;638 }639 640 /* Get the minimal and maximal sample rate that the microphone supports */641 atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);642 643 /* register cpu dai */644 atmel_pdmic_cpu_dai.capture.rate_min = rate_min;645 atmel_pdmic_cpu_dai.capture.rate_max = rate_max;646 ret = devm_snd_soc_register_component(dev,647 &atmel_pdmic_cpu_dai_component,648 &atmel_pdmic_cpu_dai, 1);649 if (ret) {650 dev_err(dev, "could not register CPU DAI: %d\n", ret);651 return ret;652 }653 654 /* register platform */655 ret = devm_snd_dmaengine_pcm_register(dev,656 &atmel_pdmic_dmaengine_pcm_config,657 0);658 if (ret) {659 dev_err(dev, "could not register platform: %d\n", ret);660 return ret;661 }662 663 /* register sound card */664 card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);665 if (!card) {666 ret = -ENOMEM;667 goto unregister_codec;668 }669 670 snd_soc_card_set_drvdata(card, dd);671 672 ret = atmel_pdmic_asoc_card_init(dev, card);673 if (ret) {674 dev_err(dev, "failed to init sound card: %d\n", ret);675 goto unregister_codec;676 }677 678 ret = devm_snd_soc_register_card(dev, card);679 if (ret) {680 dev_err(dev, "failed to register sound card: %d\n", ret);681 goto unregister_codec;682 }683 684 return 0;685 686unregister_codec:687 return ret;688}689 690static struct platform_driver atmel_pdmic_driver = {691 .driver = {692 .name = "atmel-pdmic",693 .of_match_table = atmel_pdmic_of_match,694 .pm = &snd_soc_pm_ops,695 },696 .probe = atmel_pdmic_probe,697};698module_platform_driver(atmel_pdmic_driver);699 700MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");701MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");702MODULE_LICENSE("GPL v2");703