linux/sound/soc/atmel/atmel-pdmic.c
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   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
  23struct atmel_pdmic_pdata {
  24        u32 mic_min_freq;
  25        u32 mic_max_freq;
  26        s32 mic_offset;
  27        const char *card_name;
  28};
  29
  30struct 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
  40static const struct of_device_id atmel_pdmic_of_match[] = {
  41        {
  42                .compatible = "atmel,sama5d2-pdmic",
  43        }, {
  44                /* sentinel */
  45        }
  46};
  47MODULE_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
  52static 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 be 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 */
 106static 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                clk_disable_unprepare(dd->gclk);
 120                return ret;
 121        }
 122
 123        /* Clear all bits in the Control Register(PDMIC_CR) */
 124        regmap_write(dd->regmap, PDMIC_CR, 0);
 125
 126        dd->substream = substream;
 127
 128        /* Enable the overrun error interrupt */
 129        regmap_write(dd->regmap, PDMIC_IER, PDMIC_IER_OVRE);
 130
 131        return 0;
 132}
 133
 134static void atmel_pdmic_cpu_dai_shutdown(struct snd_pcm_substream *substream,
 135                                        struct snd_soc_dai *cpu_dai)
 136{
 137        struct snd_soc_pcm_runtime *rtd = substream->private_data;
 138        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 139
 140        /* Disable the overrun error interrupt */
 141        regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE);
 142
 143        clk_disable_unprepare(dd->gclk);
 144        clk_disable_unprepare(dd->pclk);
 145}
 146
 147static int atmel_pdmic_cpu_dai_prepare(struct snd_pcm_substream *substream,
 148                                        struct snd_soc_dai *cpu_dai)
 149{
 150        struct snd_soc_pcm_runtime *rtd = substream->private_data;
 151        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 152        u32 val;
 153
 154        /* Clean the PDMIC Converted Data Register */
 155        return regmap_read(dd->regmap, PDMIC_CDR, &val);
 156}
 157
 158static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = {
 159        .startup        = atmel_pdmic_cpu_dai_startup,
 160        .shutdown       = atmel_pdmic_cpu_dai_shutdown,
 161        .prepare        = atmel_pdmic_cpu_dai_prepare,
 162};
 163
 164#define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
 165
 166static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = {
 167        .capture = {
 168                .channels_min   = 1,
 169                .channels_max   = 1,
 170                .rates          = SNDRV_PCM_RATE_KNOT,
 171                .formats        = ATMEL_PDMIC_FORMATS,},
 172        .ops = &atmel_pdmic_cpu_dai_ops,
 173};
 174
 175static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = {
 176        .name = "atmel-pdmic",
 177};
 178
 179/* platform */
 180#define ATMEL_PDMIC_MAX_BUF_SIZE  (64 * 1024)
 181#define ATMEL_PDMIC_PREALLOC_BUF_SIZE  ATMEL_PDMIC_MAX_BUF_SIZE
 182
 183static const struct snd_pcm_hardware atmel_pdmic_hw = {
 184        .info                   = SNDRV_PCM_INFO_MMAP
 185                                | SNDRV_PCM_INFO_MMAP_VALID
 186                                | SNDRV_PCM_INFO_INTERLEAVED
 187                                | SNDRV_PCM_INFO_RESUME
 188                                | SNDRV_PCM_INFO_PAUSE,
 189        .formats                = ATMEL_PDMIC_FORMATS,
 190        .buffer_bytes_max       = ATMEL_PDMIC_MAX_BUF_SIZE,
 191        .period_bytes_min       = 256,
 192        .period_bytes_max       = 32 * 1024,
 193        .periods_min            = 2,
 194        .periods_max            = 256,
 195};
 196
 197static int
 198atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream,
 199                                struct snd_pcm_hw_params *params,
 200                                struct dma_slave_config *slave_config)
 201{
 202        struct snd_soc_pcm_runtime *rtd = substream->private_data;
 203        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 204        int ret;
 205
 206        ret = snd_hwparams_to_dma_slave_config(substream, params,
 207                                               slave_config);
 208        if (ret) {
 209                dev_err(rtd->platform->dev,
 210                        "hw params to dma slave configure failed\n");
 211                return ret;
 212        }
 213
 214        slave_config->src_addr          = dd->phy_base + PDMIC_CDR;
 215        slave_config->src_maxburst      = 1;
 216        slave_config->dst_maxburst      = 1;
 217
 218        return 0;
 219}
 220
 221static const struct snd_dmaengine_pcm_config
 222atmel_pdmic_dmaengine_pcm_config = {
 223        .prepare_slave_config   = atmel_pdmic_platform_configure_dma,
 224        .pcm_hardware           = &atmel_pdmic_hw,
 225        .prealloc_buffer_size   = ATMEL_PDMIC_PREALLOC_BUF_SIZE,
 226};
 227
 228/* codec */
 229/* Mic Gain = dgain * 2^(-scale) */
 230struct mic_gain {
 231        unsigned int dgain;
 232        unsigned int scale;
 233};
 234
 235/* range from -90 dB to 90 dB */
 236static const struct mic_gain mic_gain_table[] = {
 237{    1, 15}, {    1, 14},                           /* -90, -84 dB */
 238{    3, 15}, {    1, 13}, {    3, 14}, {    1, 12}, /* -81, -78, -75, -72 dB */
 239{    5, 14}, {   13, 15},                           /* -70, -68 dB */
 240{    9, 14}, {   21, 15}, {   23, 15}, {   13, 14}, /* -65 ~ -62 dB */
 241{   29, 15}, {   33, 15}, {   37, 15}, {   41, 15}, /* -61 ~ -58 dB */
 242{   23, 14}, {   13, 13}, {   58, 15}, {   65, 15}, /* -57 ~ -54 dB */
 243{   73, 15}, {   41, 14}, {   23, 13}, {   13, 12}, /* -53 ~ -50 dB */
 244{   29, 13}, {   65, 14}, {   73, 14}, {   41, 13}, /* -49 ~ -46 dB */
 245{   23, 12}, {  207, 15}, {   29, 12}, {   65, 13}, /* -45 ~ -42 dB */
 246{   73, 13}, {   41, 12}, {   23, 11}, {  413, 15}, /* -41 ~ -38 dB */
 247{  463, 15}, {  519, 15}, {  583, 15}, {  327, 14}, /* -37 ~ -34 dB */
 248{  367, 14}, {  823, 15}, {  231, 13}, { 1036, 15}, /* -33 ~ -30 dB */
 249{ 1163, 15}, { 1305, 15}, {  183, 12}, { 1642, 15}, /* -29 ~ -26 dB */
 250{ 1843, 15}, { 2068, 15}, {  145, 11}, { 2603, 15}, /* -25 ~ -22 dB */
 251{  365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */
 252{ 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */
 253{  917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */
 254{11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /*  -9 ~ -6 dB */
 255{18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /*  -5 ~ -2 dB */
 256{ 7301, 13}, {    1,  0}, {18383, 14}, {10313, 13}, /*  -1 ~ 2 dB */
 257{23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /*   3 ~ 6 dB */
 258{ 4585, 11}, {20577, 13}, { 1443,  9}, {25905, 13}, /*   7 ~ 10 dB */
 259{14533, 12}, { 8153, 11}, { 2287,  9}, {20529, 12}, /*  11 ~ 14 dB */
 260{11517, 11}, { 6461, 10}, {28997, 12}, { 4067,  9}, /*  15 ~ 18 dB */
 261{18253, 11}, {   10,  0}, {22979, 11}, {25783, 11}, /*  19 ~ 22 dB */
 262{28929, 11}, {32459, 11}, { 9105,  9}, {20431, 10}, /*  23 ~ 26 dB */
 263{22925, 10}, {12861,  9}, { 7215,  8}, {16191,  9}, /*  27 ~ 30 dB */
 264{ 9083,  8}, {20383,  9}, {11435,  8}, { 6145,  7}, /*  31 ~ 34 dB */
 265{ 3599,  6}, {32305,  9}, {18123,  8}, {20335,  8}, /*  35 ~ 38 dB */
 266{  713,  3}, {  100,  0}, { 7181,  6}, { 8057,  6}, /*  39 ~ 42 dB */
 267{  565,  2}, {20287,  7}, {11381,  6}, {25539,  7}, /*  43 ~ 46 dB */
 268{ 1791,  3}, { 4019,  4}, { 9019,  5}, {20239,  6}, /*  47 ~ 50 dB */
 269{ 5677,  4}, {25479,  6}, { 7147,  4}, { 8019,  4}, /*  51 ~ 54 dB */
 270{17995,  5}, {20191,  5}, {11327,  4}, {12709,  4}, /*  55 ~ 58 dB */
 271{ 3565,  2}, { 1000,  0}, { 1122,  0}, { 1259,  0}, /*  59 ~ 62 dB */
 272{ 2825,  1}, {12679,  3}, { 7113,  2}, { 7981,  2}, /*  63 ~ 66 dB */
 273{ 8955,  2}, {20095,  3}, {22547,  3}, {12649,  2}, /*  67 ~ 70 dB */
 274{28385,  3}, { 3981,  0}, {17867,  2}, {20047,  2}, /*  71 ~ 74 dB */
 275{11247,  1}, {12619,  1}, {14159,  1}, {31773,  2}, /*  75 ~ 78 dB */
 276{17825,  1}, {10000,  0}, {11220,  0}, {12589,  0}, /*  79 ~ 82 dB */
 277{28251,  1}, {15849,  0}, {17783,  0}, {19953,  0}, /*  83 ~ 86 dB */
 278{22387,  0}, {25119,  0}, {28184,  0}, {31623,  0}, /*  87 ~ 90 dB */
 279};
 280
 281static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,
 282        0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0),
 283        2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0),
 284        6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0),
 285        8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0),
 286);
 287
 288static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol,
 289        struct snd_ctl_elem_value *ucontrol)
 290{
 291        struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
 292        unsigned int dgain_val, scale_val;
 293        int i;
 294
 295        dgain_val = (snd_soc_read(codec, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK)
 296                    >> PDMIC_DSPR1_DGAIN_SHIFT;
 297
 298        scale_val = (snd_soc_read(codec, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK)
 299                    >> PDMIC_DSPR0_SCALE_SHIFT;
 300
 301        for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
 302                if ((mic_gain_table[i].dgain == dgain_val) &&
 303                    (mic_gain_table[i].scale == scale_val))
 304                        ucontrol->value.integer.value[0] = i;
 305        }
 306
 307        return 0;
 308}
 309
 310static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol,
 311        struct snd_ctl_elem_value *ucontrol)
 312{
 313        struct soc_mixer_control *mc =
 314                (struct soc_mixer_control *)kcontrol->private_value;
 315        struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
 316        int max = mc->max;
 317        unsigned int val;
 318        int ret;
 319
 320        val = ucontrol->value.integer.value[0];
 321
 322        if (val > max)
 323                return -EINVAL;
 324
 325        ret = snd_soc_update_bits(codec, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK,
 326                         mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT);
 327        if (ret < 0)
 328                return ret;
 329
 330        ret = snd_soc_update_bits(codec, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK,
 331                         mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT);
 332        if (ret < 0)
 333                return ret;
 334
 335        return 0;
 336}
 337
 338static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {
 339SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT,
 340                   ARRAY_SIZE(mic_gain_table)-1, 0,
 341                   pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv),
 342
 343SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,
 344           PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),
 345
 346SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),
 347};
 348
 349static int atmel_pdmic_codec_probe(struct snd_soc_codec *codec)
 350{
 351        struct snd_soc_card *card = snd_soc_codec_get_drvdata(codec);
 352        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
 353
 354        snd_soc_update_bits(codec, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK,
 355                     (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));
 356
 357        return 0;
 358}
 359
 360static struct snd_soc_codec_driver soc_codec_dev_pdmic = {
 361        .probe          = atmel_pdmic_codec_probe,
 362        .component_driver = {
 363                .controls               = atmel_pdmic_snd_controls,
 364                .num_controls           = ARRAY_SIZE(atmel_pdmic_snd_controls),
 365        },
 366};
 367
 368/* codec dai component */
 369#define PDMIC_MR_PRESCAL_MAX_VAL 127
 370
 371static int
 372atmel_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_codec *codec = codec_dai->codec;
 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(codec->dev,
 389                        "only supports one channel\n");
 390                return -EINVAL;
 391        }
 392
 393        if ((fs < rate_min) || (fs > rate_max)) {
 394                dev_err(codec->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_update_bits(codec, PDMIC_MR,
 440                PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val);
 441
 442        snd_soc_update_bits(codec, PDMIC_DSPR0,
 443                PDMIC_DSPR0_OSR_MASK | PDMIC_DSPR0_SIZE_MASK, dspr0_val);
 444
 445        return 0;
 446}
 447
 448static int atmel_pdmic_codec_dai_prepare(struct snd_pcm_substream *substream,
 449                                        struct snd_soc_dai *codec_dai)
 450{
 451        struct snd_soc_codec *codec = codec_dai->codec;
 452
 453        snd_soc_update_bits(codec, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
 454                            PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
 455
 456        return 0;
 457}
 458
 459static 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_codec *codec = codec_dai->codec;
 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_update_bits(codec, PDMIC_CR, PDMIC_CR_ENPDM_MASK, val);
 481
 482        return 0;
 483}
 484
 485static 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
 493static 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 */
 506static 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
 512        dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
 513        if (!dai_link)
 514                return -ENOMEM;
 515
 516        dai_link->name                  = "PDMIC";
 517        dai_link->stream_name           = "PDMIC PCM";
 518        dai_link->codec_dai_name        = ATMEL_PDMIC_CODEC_DAI_NAME;
 519        dai_link->cpu_dai_name          = dev_name(dev);
 520        dai_link->codec_name            = dev_name(dev);
 521        dai_link->platform_name         = dev_name(dev);
 522
 523        card->dai_link  = dai_link;
 524        card->num_links = 1;
 525        card->name      = dd->pdata->card_name;
 526        card->dev       = dev;
 527
 528        return 0;
 529}
 530
 531static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,
 532        unsigned int *rate_min, unsigned int *rate_max)
 533{
 534        u32 mic_min_freq = dd->pdata->mic_min_freq;
 535        u32 mic_max_freq = dd->pdata->mic_max_freq;
 536        u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);
 537        u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);
 538
 539        if (mic_max_freq > clk_max_rate)
 540                mic_max_freq = clk_max_rate;
 541
 542        if (mic_min_freq < clk_min_rate)
 543                mic_min_freq = clk_min_rate;
 544
 545        *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);
 546        *rate_max = mic_max_freq >> 6;
 547}
 548
 549/* PDMIC interrupt handler */
 550static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)
 551{
 552        struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;
 553        u32 pdmic_isr;
 554        irqreturn_t ret = IRQ_NONE;
 555
 556        regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);
 557
 558        if (pdmic_isr & PDMIC_ISR_OVRE) {
 559                regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
 560                                   PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
 561
 562                snd_pcm_stop_xrun(dd->substream);
 563
 564                ret = IRQ_HANDLED;
 565        }
 566
 567        return ret;
 568}
 569
 570/* regmap configuration */
 571#define ATMEL_PDMIC_REG_MAX    0x124
 572static const struct regmap_config atmel_pdmic_regmap_config = {
 573        .reg_bits       = 32,
 574        .reg_stride     = 4,
 575        .val_bits       = 32,
 576        .max_register   = ATMEL_PDMIC_REG_MAX,
 577};
 578
 579static int atmel_pdmic_probe(struct platform_device *pdev)
 580{
 581        struct device *dev = &pdev->dev;
 582        struct atmel_pdmic *dd;
 583        struct resource *res;
 584        void __iomem *io_base;
 585        const struct atmel_pdmic_pdata *pdata;
 586        struct snd_soc_card *card;
 587        unsigned int rate_min, rate_max;
 588        int ret;
 589
 590        pdata = atmel_pdmic_dt_init(dev);
 591        if (IS_ERR(pdata))
 592                return PTR_ERR(pdata);
 593
 594        dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
 595        if (!dd)
 596                return -ENOMEM;
 597
 598        dd->pdata = pdata;
 599
 600        dd->irq = platform_get_irq(pdev, 0);
 601        if (dd->irq < 0) {
 602                ret = dd->irq;
 603                dev_err(dev, "failed to get irq: %d\n", ret);
 604                return ret;
 605        }
 606
 607        dd->pclk = devm_clk_get(dev, "pclk");
 608        if (IS_ERR(dd->pclk)) {
 609                ret = PTR_ERR(dd->pclk);
 610                dev_err(dev, "failed to get peripheral clock: %d\n", ret);
 611                return ret;
 612        }
 613
 614        dd->gclk = devm_clk_get(dev, "gclk");
 615        if (IS_ERR(dd->gclk)) {
 616                ret = PTR_ERR(dd->gclk);
 617                dev_err(dev, "failed to get GCK: %d\n", ret);
 618                return ret;
 619        }
 620
 621        /* The gclk clock frequency must always be three times
 622         * lower than the pclk clock frequency
 623         */
 624        ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);
 625        if (ret) {
 626                dev_err(dev, "failed to set GCK clock rate: %d\n", ret);
 627                return ret;
 628        }
 629
 630        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 631        io_base = devm_ioremap_resource(dev, res);
 632        if (IS_ERR(io_base)) {
 633                ret = PTR_ERR(io_base);
 634                dev_err(dev, "failed to remap register memory: %d\n", ret);
 635                return ret;
 636        }
 637
 638        dd->phy_base = res->start;
 639
 640        dd->regmap = devm_regmap_init_mmio(dev, io_base,
 641                                           &atmel_pdmic_regmap_config);
 642        if (IS_ERR(dd->regmap)) {
 643                ret = PTR_ERR(dd->regmap);
 644                dev_err(dev, "failed to init register map: %d\n", ret);
 645                return ret;
 646        }
 647
 648        ret =  devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,
 649                                "PDMIC", (void *)dd);
 650        if (ret < 0) {
 651                dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
 652                        dd->irq, ret);
 653                return ret;
 654        }
 655
 656        /* Get the minimal and maximal sample rate that the microphone supports */
 657        atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);
 658
 659        /* register cpu dai */
 660        atmel_pdmic_cpu_dai.capture.rate_min = rate_min;
 661        atmel_pdmic_cpu_dai.capture.rate_max = rate_max;
 662        ret = devm_snd_soc_register_component(dev,
 663                                              &atmel_pdmic_cpu_dai_component,
 664                                              &atmel_pdmic_cpu_dai, 1);
 665        if (ret) {
 666                dev_err(dev, "could not register CPU DAI: %d\n", ret);
 667                return ret;
 668        }
 669
 670        /* register platform */
 671        ret = devm_snd_dmaengine_pcm_register(dev,
 672                                             &atmel_pdmic_dmaengine_pcm_config,
 673                                             0);
 674        if (ret) {
 675                dev_err(dev, "could not register platform: %d\n", ret);
 676                return ret;
 677        }
 678
 679        /* register codec and codec dai */
 680        atmel_pdmic_codec_dai.capture.rate_min = rate_min;
 681        atmel_pdmic_codec_dai.capture.rate_max = rate_max;
 682        ret = snd_soc_register_codec(dev, &soc_codec_dev_pdmic,
 683                                     &atmel_pdmic_codec_dai, 1);
 684        if (ret) {
 685                dev_err(dev, "could not register codec: %d\n", ret);
 686                return ret;
 687        }
 688
 689        /* register sound card */
 690        card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 691        if (!card) {
 692                ret = -ENOMEM;
 693                goto unregister_codec;
 694        }
 695
 696        snd_soc_card_set_drvdata(card, dd);
 697        platform_set_drvdata(pdev, card);
 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
 713unregister_codec:
 714        snd_soc_unregister_codec(dev);
 715        return ret;
 716}
 717
 718static int atmel_pdmic_remove(struct platform_device *pdev)
 719{
 720        snd_soc_unregister_codec(&pdev->dev);
 721        return 0;
 722}
 723
 724static struct platform_driver atmel_pdmic_driver = {
 725        .driver = {
 726                .name           = "atmel-pdmic",
 727                .of_match_table = of_match_ptr(atmel_pdmic_of_match),
 728                .pm             = &snd_soc_pm_ops,
 729        },
 730        .probe  = atmel_pdmic_probe,
 731        .remove = atmel_pdmic_remove,
 732};
 733module_platform_driver(atmel_pdmic_driver);
 734
 735MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");
 736MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
 737MODULE_LICENSE("GPL v2");
 738