linux/sound/soc/atmel/atmel-pdmic.c
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   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
  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_MAX
  48#define PDMIC_OFFSET_MIN_VAL    S16_MIN
  49
  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 = substream->private_data;
 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 = substream->private_data;
 136        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 137
 138        /* Disable the overrun error interrupt */
 139        regmap_write(dd->regmap, PDMIC_IDR, PDMIC_IDR_OVRE);
 140
 141        clk_disable_unprepare(dd->gclk);
 142        clk_disable_unprepare(dd->pclk);
 143}
 144
 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 = substream->private_data;
 149        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 150        u32 val;
 151
 152        /* Clean the PDMIC Converted Data Register */
 153        return regmap_read(dd->regmap, PDMIC_CDR, &val);
 154}
 155
 156static const struct snd_soc_dai_ops atmel_pdmic_cpu_dai_ops = {
 157        .startup        = atmel_pdmic_cpu_dai_startup,
 158        .shutdown       = atmel_pdmic_cpu_dai_shutdown,
 159        .prepare        = atmel_pdmic_cpu_dai_prepare,
 160};
 161
 162#define ATMEL_PDMIC_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
 163
 164static struct snd_soc_dai_driver atmel_pdmic_cpu_dai = {
 165        .capture = {
 166                .channels_min   = 1,
 167                .channels_max   = 1,
 168                .rates          = SNDRV_PCM_RATE_KNOT,
 169                .formats        = ATMEL_PDMIC_FORMATS,},
 170        .ops = &atmel_pdmic_cpu_dai_ops,
 171};
 172
 173static const struct snd_soc_component_driver atmel_pdmic_cpu_dai_component = {
 174        .name = "atmel-pdmic",
 175};
 176
 177/* platform */
 178#define ATMEL_PDMIC_MAX_BUF_SIZE  (64 * 1024)
 179#define ATMEL_PDMIC_PREALLOC_BUF_SIZE  ATMEL_PDMIC_MAX_BUF_SIZE
 180
 181static const struct snd_pcm_hardware atmel_pdmic_hw = {
 182        .info                   = SNDRV_PCM_INFO_MMAP
 183                                | SNDRV_PCM_INFO_MMAP_VALID
 184                                | SNDRV_PCM_INFO_INTERLEAVED
 185                                | SNDRV_PCM_INFO_RESUME
 186                                | SNDRV_PCM_INFO_PAUSE,
 187        .formats                = ATMEL_PDMIC_FORMATS,
 188        .buffer_bytes_max       = ATMEL_PDMIC_MAX_BUF_SIZE,
 189        .period_bytes_min       = 256,
 190        .period_bytes_max       = 32 * 1024,
 191        .periods_min            = 2,
 192        .periods_max            = 256,
 193};
 194
 195static int
 196atmel_pdmic_platform_configure_dma(struct snd_pcm_substream *substream,
 197                                struct snd_pcm_hw_params *params,
 198                                struct dma_slave_config *slave_config)
 199{
 200        struct snd_soc_pcm_runtime *rtd = substream->private_data;
 201        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(rtd->card);
 202        int ret;
 203
 204        ret = snd_hwparams_to_dma_slave_config(substream, params,
 205                                               slave_config);
 206        if (ret) {
 207                dev_err(dd->dev,
 208                        "hw params to dma slave configure failed\n");
 209                return ret;
 210        }
 211
 212        slave_config->src_addr          = dd->phy_base + PDMIC_CDR;
 213        slave_config->src_maxburst      = 1;
 214        slave_config->dst_maxburst      = 1;
 215
 216        return 0;
 217}
 218
 219static const struct snd_dmaengine_pcm_config
 220atmel_pdmic_dmaengine_pcm_config = {
 221        .prepare_slave_config   = atmel_pdmic_platform_configure_dma,
 222        .pcm_hardware           = &atmel_pdmic_hw,
 223        .prealloc_buffer_size   = ATMEL_PDMIC_PREALLOC_BUF_SIZE,
 224};
 225
 226/* codec */
 227/* Mic Gain = dgain * 2^(-scale) */
 228struct mic_gain {
 229        unsigned int dgain;
 230        unsigned int scale;
 231};
 232
 233/* range from -90 dB to 90 dB */
 234static const struct mic_gain mic_gain_table[] = {
 235{    1, 15}, {    1, 14},                           /* -90, -84 dB */
 236{    3, 15}, {    1, 13}, {    3, 14}, {    1, 12}, /* -81, -78, -75, -72 dB */
 237{    5, 14}, {   13, 15},                           /* -70, -68 dB */
 238{    9, 14}, {   21, 15}, {   23, 15}, {   13, 14}, /* -65 ~ -62 dB */
 239{   29, 15}, {   33, 15}, {   37, 15}, {   41, 15}, /* -61 ~ -58 dB */
 240{   23, 14}, {   13, 13}, {   58, 15}, {   65, 15}, /* -57 ~ -54 dB */
 241{   73, 15}, {   41, 14}, {   23, 13}, {   13, 12}, /* -53 ~ -50 dB */
 242{   29, 13}, {   65, 14}, {   73, 14}, {   41, 13}, /* -49 ~ -46 dB */
 243{   23, 12}, {  207, 15}, {   29, 12}, {   65, 13}, /* -45 ~ -42 dB */
 244{   73, 13}, {   41, 12}, {   23, 11}, {  413, 15}, /* -41 ~ -38 dB */
 245{  463, 15}, {  519, 15}, {  583, 15}, {  327, 14}, /* -37 ~ -34 dB */
 246{  367, 14}, {  823, 15}, {  231, 13}, { 1036, 15}, /* -33 ~ -30 dB */
 247{ 1163, 15}, { 1305, 15}, {  183, 12}, { 1642, 15}, /* -29 ~ -26 dB */
 248{ 1843, 15}, { 2068, 15}, {  145, 11}, { 2603, 15}, /* -25 ~ -22 dB */
 249{  365, 12}, { 3277, 15}, { 3677, 15}, { 4125, 15}, /* -21 ~ -18 dB */
 250{ 4629, 15}, { 5193, 15}, { 5827, 15}, { 3269, 14}, /* -17 ~ -14 dB */
 251{  917, 12}, { 8231, 15}, { 9235, 15}, { 5181, 14}, /* -13 ~ -10 dB */
 252{11627, 15}, {13045, 15}, {14637, 15}, {16423, 15}, /*  -9 ~ -6 dB */
 253{18427, 15}, {20675, 15}, { 5799, 13}, {26029, 15}, /*  -5 ~ -2 dB */
 254{ 7301, 13}, {    1,  0}, {18383, 14}, {10313, 13}, /*  -1 ~ 2 dB */
 255{23143, 14}, {25967, 14}, {29135, 14}, {16345, 13}, /*   3 ~ 6 dB */
 256{ 4585, 11}, {20577, 13}, { 1443,  9}, {25905, 13}, /*   7 ~ 10 dB */
 257{14533, 12}, { 8153, 11}, { 2287,  9}, {20529, 12}, /*  11 ~ 14 dB */
 258{11517, 11}, { 6461, 10}, {28997, 12}, { 4067,  9}, /*  15 ~ 18 dB */
 259{18253, 11}, {   10,  0}, {22979, 11}, {25783, 11}, /*  19 ~ 22 dB */
 260{28929, 11}, {32459, 11}, { 9105,  9}, {20431, 10}, /*  23 ~ 26 dB */
 261{22925, 10}, {12861,  9}, { 7215,  8}, {16191,  9}, /*  27 ~ 30 dB */
 262{ 9083,  8}, {20383,  9}, {11435,  8}, { 6145,  7}, /*  31 ~ 34 dB */
 263{ 3599,  6}, {32305,  9}, {18123,  8}, {20335,  8}, /*  35 ~ 38 dB */
 264{  713,  3}, {  100,  0}, { 7181,  6}, { 8057,  6}, /*  39 ~ 42 dB */
 265{  565,  2}, {20287,  7}, {11381,  6}, {25539,  7}, /*  43 ~ 46 dB */
 266{ 1791,  3}, { 4019,  4}, { 9019,  5}, {20239,  6}, /*  47 ~ 50 dB */
 267{ 5677,  4}, {25479,  6}, { 7147,  4}, { 8019,  4}, /*  51 ~ 54 dB */
 268{17995,  5}, {20191,  5}, {11327,  4}, {12709,  4}, /*  55 ~ 58 dB */
 269{ 3565,  2}, { 1000,  0}, { 1122,  0}, { 1259,  0}, /*  59 ~ 62 dB */
 270{ 2825,  1}, {12679,  3}, { 7113,  2}, { 7981,  2}, /*  63 ~ 66 dB */
 271{ 8955,  2}, {20095,  3}, {22547,  3}, {12649,  2}, /*  67 ~ 70 dB */
 272{28385,  3}, { 3981,  0}, {17867,  2}, {20047,  2}, /*  71 ~ 74 dB */
 273{11247,  1}, {12619,  1}, {14159,  1}, {31773,  2}, /*  75 ~ 78 dB */
 274{17825,  1}, {10000,  0}, {11220,  0}, {12589,  0}, /*  79 ~ 82 dB */
 275{28251,  1}, {15849,  0}, {17783,  0}, {19953,  0}, /*  83 ~ 86 dB */
 276{22387,  0}, {25119,  0}, {28184,  0}, {31623,  0}, /*  87 ~ 90 dB */
 277};
 278
 279static const DECLARE_TLV_DB_RANGE(mic_gain_tlv,
 280        0, 1, TLV_DB_SCALE_ITEM(-9000, 600, 0),
 281        2, 5, TLV_DB_SCALE_ITEM(-8100, 300, 0),
 282        6, 7, TLV_DB_SCALE_ITEM(-7000, 200, 0),
 283        8, ARRAY_SIZE(mic_gain_table)-1, TLV_DB_SCALE_ITEM(-6500, 100, 0),
 284);
 285
 286static int pdmic_get_mic_volsw(struct snd_kcontrol *kcontrol,
 287        struct snd_ctl_elem_value *ucontrol)
 288{
 289        struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 290        unsigned int dgain_val, scale_val;
 291        int i;
 292
 293        dgain_val = (snd_soc_component_read32(component, PDMIC_DSPR1) & PDMIC_DSPR1_DGAIN_MASK)
 294                    >> PDMIC_DSPR1_DGAIN_SHIFT;
 295
 296        scale_val = (snd_soc_component_read32(component, PDMIC_DSPR0) & PDMIC_DSPR0_SCALE_MASK)
 297                    >> PDMIC_DSPR0_SCALE_SHIFT;
 298
 299        for (i = 0; i < ARRAY_SIZE(mic_gain_table); i++) {
 300                if ((mic_gain_table[i].dgain == dgain_val) &&
 301                    (mic_gain_table[i].scale == scale_val))
 302                        ucontrol->value.integer.value[0] = i;
 303        }
 304
 305        return 0;
 306}
 307
 308static int pdmic_put_mic_volsw(struct snd_kcontrol *kcontrol,
 309        struct snd_ctl_elem_value *ucontrol)
 310{
 311        struct soc_mixer_control *mc =
 312                (struct soc_mixer_control *)kcontrol->private_value;
 313        struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 314        int max = mc->max;
 315        unsigned int val;
 316        int ret;
 317
 318        val = ucontrol->value.integer.value[0];
 319
 320        if (val > max)
 321                return -EINVAL;
 322
 323        ret = snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_MASK,
 324                         mic_gain_table[val].dgain << PDMIC_DSPR1_DGAIN_SHIFT);
 325        if (ret < 0)
 326                return ret;
 327
 328        ret = snd_soc_component_update_bits(component, PDMIC_DSPR0, PDMIC_DSPR0_SCALE_MASK,
 329                         mic_gain_table[val].scale << PDMIC_DSPR0_SCALE_SHIFT);
 330        if (ret < 0)
 331                return ret;
 332
 333        return 0;
 334}
 335
 336static const struct snd_kcontrol_new atmel_pdmic_snd_controls[] = {
 337SOC_SINGLE_EXT_TLV("Mic Capture Volume", PDMIC_DSPR1, PDMIC_DSPR1_DGAIN_SHIFT,
 338                   ARRAY_SIZE(mic_gain_table)-1, 0,
 339                   pdmic_get_mic_volsw, pdmic_put_mic_volsw, mic_gain_tlv),
 340
 341SOC_SINGLE("High Pass Filter Switch", PDMIC_DSPR0,
 342           PDMIC_DSPR0_HPFBYP_SHIFT, 1, 1),
 343
 344SOC_SINGLE("SINCC Filter Switch", PDMIC_DSPR0, PDMIC_DSPR0_SINBYP_SHIFT, 1, 1),
 345};
 346
 347static int atmel_pdmic_component_probe(struct snd_soc_component *component)
 348{
 349        struct snd_soc_card *card = snd_soc_component_get_drvdata(component);
 350        struct atmel_pdmic *dd = snd_soc_card_get_drvdata(card);
 351
 352        snd_soc_component_update_bits(component, PDMIC_DSPR1, PDMIC_DSPR1_OFFSET_MASK,
 353                     (u32)(dd->pdata->mic_offset << PDMIC_DSPR1_OFFSET_SHIFT));
 354
 355        return 0;
 356}
 357
 358static struct snd_soc_component_driver soc_component_dev_pdmic = {
 359        .probe                  = atmel_pdmic_component_probe,
 360        .controls               = atmel_pdmic_snd_controls,
 361        .num_controls           = ARRAY_SIZE(atmel_pdmic_snd_controls),
 362        .idle_bias_on           = 1,
 363        .use_pmdown_time        = 1,
 364        .endianness             = 1,
 365        .non_legacy_dai_naming  = 1,
 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_component *component = codec_dai->component;
 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(component->dev,
 389                        "only supports one channel\n");
 390                return -EINVAL;
 391        }
 392
 393        if ((fs < rate_min) || (fs > rate_max)) {
 394                dev_err(component->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_component_update_bits(component, PDMIC_MR,
 440                PDMIC_MR_PRESCAL_MASK | PDMIC_MR_CLKS_MASK, mr_val);
 441
 442        snd_soc_component_update_bits(component, 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_component *component = codec_dai->component;
 452
 453        snd_soc_component_update_bits(component, 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_component *component = codec_dai->component;
 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_component_update_bits(component, 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        struct snd_soc_dai_link_component *comp;
 512
 513        dai_link = devm_kzalloc(dev, sizeof(*dai_link), GFP_KERNEL);
 514        if (!dai_link)
 515                return -ENOMEM;
 516
 517        comp = devm_kzalloc(dev, 3 * sizeof(*comp), GFP_KERNEL);
 518        if (!comp)
 519                return -ENOMEM;
 520
 521        dai_link->cpus          = &comp[0];
 522        dai_link->codecs        = &comp[1];
 523        dai_link->platforms     = &comp[2];
 524
 525        dai_link->num_cpus      = 1;
 526        dai_link->num_codecs    = 1;
 527        dai_link->num_platforms = 1;
 528
 529        dai_link->name                  = "PDMIC";
 530        dai_link->stream_name           = "PDMIC PCM";
 531        dai_link->codecs->dai_name      = ATMEL_PDMIC_CODEC_DAI_NAME;
 532        dai_link->cpus->dai_name        = dev_name(dev);
 533        dai_link->codecs->name          = dev_name(dev);
 534        dai_link->platforms->name       = dev_name(dev);
 535
 536        card->dai_link  = dai_link;
 537        card->num_links = 1;
 538        card->name      = dd->pdata->card_name;
 539        card->dev       = dev;
 540
 541        return 0;
 542}
 543
 544static void atmel_pdmic_get_sample_rate(struct atmel_pdmic *dd,
 545        unsigned int *rate_min, unsigned int *rate_max)
 546{
 547        u32 mic_min_freq = dd->pdata->mic_min_freq;
 548        u32 mic_max_freq = dd->pdata->mic_max_freq;
 549        u32 clk_max_rate = (u32)(clk_get_rate(dd->pclk) >> 1);
 550        u32 clk_min_rate = (u32)(clk_get_rate(dd->gclk) >> 8);
 551
 552        if (mic_max_freq > clk_max_rate)
 553                mic_max_freq = clk_max_rate;
 554
 555        if (mic_min_freq < clk_min_rate)
 556                mic_min_freq = clk_min_rate;
 557
 558        *rate_min = DIV_ROUND_CLOSEST(mic_min_freq, 128);
 559        *rate_max = mic_max_freq >> 6;
 560}
 561
 562/* PDMIC interrupt handler */
 563static irqreturn_t atmel_pdmic_interrupt(int irq, void *dev_id)
 564{
 565        struct atmel_pdmic *dd = (struct atmel_pdmic *)dev_id;
 566        u32 pdmic_isr;
 567        irqreturn_t ret = IRQ_NONE;
 568
 569        regmap_read(dd->regmap, PDMIC_ISR, &pdmic_isr);
 570
 571        if (pdmic_isr & PDMIC_ISR_OVRE) {
 572                regmap_update_bits(dd->regmap, PDMIC_CR, PDMIC_CR_ENPDM_MASK,
 573                                   PDMIC_CR_ENPDM_DIS << PDMIC_CR_ENPDM_SHIFT);
 574
 575                snd_pcm_stop_xrun(dd->substream);
 576
 577                ret = IRQ_HANDLED;
 578        }
 579
 580        return ret;
 581}
 582
 583/* regmap configuration */
 584#define ATMEL_PDMIC_REG_MAX    0x124
 585static const struct regmap_config atmel_pdmic_regmap_config = {
 586        .reg_bits       = 32,
 587        .reg_stride     = 4,
 588        .val_bits       = 32,
 589        .max_register   = ATMEL_PDMIC_REG_MAX,
 590};
 591
 592static int atmel_pdmic_probe(struct platform_device *pdev)
 593{
 594        struct device *dev = &pdev->dev;
 595        struct atmel_pdmic *dd;
 596        struct resource *res;
 597        void __iomem *io_base;
 598        const struct atmel_pdmic_pdata *pdata;
 599        struct snd_soc_card *card;
 600        unsigned int rate_min, rate_max;
 601        int ret;
 602
 603        pdata = atmel_pdmic_dt_init(dev);
 604        if (IS_ERR(pdata))
 605                return PTR_ERR(pdata);
 606
 607        dd = devm_kzalloc(dev, sizeof(*dd), GFP_KERNEL);
 608        if (!dd)
 609                return -ENOMEM;
 610
 611        dd->pdata = pdata;
 612        dd->dev = dev;
 613
 614        dd->irq = platform_get_irq(pdev, 0);
 615        if (dd->irq < 0)
 616                return dd->irq;
 617
 618        dd->pclk = devm_clk_get(dev, "pclk");
 619        if (IS_ERR(dd->pclk)) {
 620                ret = PTR_ERR(dd->pclk);
 621                dev_err(dev, "failed to get peripheral clock: %d\n", ret);
 622                return ret;
 623        }
 624
 625        dd->gclk = devm_clk_get(dev, "gclk");
 626        if (IS_ERR(dd->gclk)) {
 627                ret = PTR_ERR(dd->gclk);
 628                dev_err(dev, "failed to get GCK: %d\n", ret);
 629                return ret;
 630        }
 631
 632        /* The gclk clock frequency must always be three times
 633         * lower than the pclk clock frequency
 634         */
 635        ret = clk_set_rate(dd->gclk, clk_get_rate(dd->pclk)/3);
 636        if (ret) {
 637                dev_err(dev, "failed to set GCK clock rate: %d\n", ret);
 638                return ret;
 639        }
 640
 641        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 642        io_base = devm_ioremap_resource(dev, res);
 643        if (IS_ERR(io_base))
 644                return PTR_ERR(io_base);
 645
 646        dd->phy_base = res->start;
 647
 648        dd->regmap = devm_regmap_init_mmio(dev, io_base,
 649                                           &atmel_pdmic_regmap_config);
 650        if (IS_ERR(dd->regmap)) {
 651                ret = PTR_ERR(dd->regmap);
 652                dev_err(dev, "failed to init register map: %d\n", ret);
 653                return ret;
 654        }
 655
 656        ret =  devm_request_irq(dev, dd->irq, atmel_pdmic_interrupt, 0,
 657                                "PDMIC", (void *)dd);
 658        if (ret < 0) {
 659                dev_err(dev, "can't register ISR for IRQ %u (ret=%i)\n",
 660                        dd->irq, ret);
 661                return ret;
 662        }
 663
 664        /* Get the minimal and maximal sample rate that the microphone supports */
 665        atmel_pdmic_get_sample_rate(dd, &rate_min, &rate_max);
 666
 667        /* register cpu dai */
 668        atmel_pdmic_cpu_dai.capture.rate_min = rate_min;
 669        atmel_pdmic_cpu_dai.capture.rate_max = rate_max;
 670        ret = devm_snd_soc_register_component(dev,
 671                                              &atmel_pdmic_cpu_dai_component,
 672                                              &atmel_pdmic_cpu_dai, 1);
 673        if (ret) {
 674                dev_err(dev, "could not register CPU DAI: %d\n", ret);
 675                return ret;
 676        }
 677
 678        /* register platform */
 679        ret = devm_snd_dmaengine_pcm_register(dev,
 680                                             &atmel_pdmic_dmaengine_pcm_config,
 681                                             0);
 682        if (ret) {
 683                dev_err(dev, "could not register platform: %d\n", ret);
 684                return ret;
 685        }
 686
 687        /* register codec and codec dai */
 688        atmel_pdmic_codec_dai.capture.rate_min = rate_min;
 689        atmel_pdmic_codec_dai.capture.rate_max = rate_max;
 690        ret = devm_snd_soc_register_component(dev, &soc_component_dev_pdmic,
 691                                     &atmel_pdmic_codec_dai, 1);
 692        if (ret) {
 693                dev_err(dev, "could not register component: %d\n", ret);
 694                return ret;
 695        }
 696
 697        /* register sound card */
 698        card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
 699        if (!card) {
 700                ret = -ENOMEM;
 701                goto unregister_codec;
 702        }
 703
 704        snd_soc_card_set_drvdata(card, dd);
 705
 706        ret = atmel_pdmic_asoc_card_init(dev, card);
 707        if (ret) {
 708                dev_err(dev, "failed to init sound card: %d\n", ret);
 709                goto unregister_codec;
 710        }
 711
 712        ret = devm_snd_soc_register_card(dev, card);
 713        if (ret) {
 714                dev_err(dev, "failed to register sound card: %d\n", ret);
 715                goto unregister_codec;
 716        }
 717
 718        return 0;
 719
 720unregister_codec:
 721        return ret;
 722}
 723
 724static int atmel_pdmic_remove(struct platform_device *pdev)
 725{
 726        return 0;
 727}
 728
 729static struct platform_driver atmel_pdmic_driver = {
 730        .driver = {
 731                .name           = "atmel-pdmic",
 732                .of_match_table = of_match_ptr(atmel_pdmic_of_match),
 733                .pm             = &snd_soc_pm_ops,
 734        },
 735        .probe  = atmel_pdmic_probe,
 736        .remove = atmel_pdmic_remove,
 737};
 738module_platform_driver(atmel_pdmic_driver);
 739
 740MODULE_DESCRIPTION("Atmel PDMIC driver under ALSA SoC architecture");
 741MODULE_AUTHOR("Songjun Wu <songjun.wu@atmel.com>");
 742MODULE_LICENSE("GPL v2");
 743