sound/soc/tegra/tegra210_dmic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // tegra210_dmic.c - Tegra210 DMIC driver
   4 //
   5 // Copyright (c) 2020 NVIDIA CORPORATION.  All rights reserved.
   6
   7 #include <linux/clk.h>
   8 #include <linux/device.h>
   9 #include <linux/math64.h>
  10 #include <linux/module.h>
  11 #include <linux/of_device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/regmap.h>
  15 #include <sound/core.h>
  16 #include <sound/pcm_params.h>
  17 #include <sound/soc.h>
  18 #include "tegra210_dmic.h"
  19 #include "tegra_cif.h"
  20
  21 static const struct reg_default tegra210_dmic_reg_defaults[] = {
  22         { TEGRA210_DMIC_TX_INT_MASK, 0x00000001 },
  23         { TEGRA210_DMIC_TX_CIF_CTRL, 0x00007700 },
  24         { TEGRA210_DMIC_CG, 0x1 },
  25         { TEGRA210_DMIC_CTRL, 0x00000301 },
  26         /* Below enables all filters - DCR, LP and SC */
  27         { TEGRA210_DMIC_DBG_CTRL, 0xe },
  28         /* Below as per latest POR value */
  29         { TEGRA210_DMIC_DCR_BIQUAD_0_COEF_4, 0x0 },
  30         /* LP filter is configured for pass through and used to apply gain */
  31         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_0, 0x00800000 },
  32         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_1, 0x0 },
  33         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_2, 0x0 },
  34         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_3, 0x0 },
  35         { TEGRA210_DMIC_LP_BIQUAD_0_COEF_4, 0x0 },
  36         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_0, 0x00800000 },
  37         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_1, 0x0 },
  38         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_2, 0x0 },
  39         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_3, 0x0 },
  40         { TEGRA210_DMIC_LP_BIQUAD_1_COEF_4, 0x0 },
  41 };
  42
  43 static int __maybe_unused tegra210_dmic_runtime_suspend(struct device *dev)
  44 {
  45         struct tegra210_dmic *dmic = dev_get_drvdata(dev);
  46
  47         regcache_cache_only(dmic->regmap, true);
  48         regcache_mark_dirty(dmic->regmap);
  49
  50         clk_disable_unprepare(dmic->clk_dmic);
  51
  52         return 0;
  53 }
  54
  55 static int __maybe_unused tegra210_dmic_runtime_resume(struct device *dev)
  56 {
  57         struct tegra210_dmic *dmic = dev_get_drvdata(dev);
  58         int err;
  59
  60         err = clk_prepare_enable(dmic->clk_dmic);
  61         if (err) {
  62                 dev_err(dev, "failed to enable DMIC clock, err: %d\n", err);
  63                 return err;
  64         }
  65
  66         regcache_cache_only(dmic->regmap, false);
  67         regcache_sync(dmic->regmap);
  68
  69         return 0;
  70 }
  71
  72 static int tegra210_dmic_hw_params(struct snd_pcm_substream *substream,
  73                                    struct snd_pcm_hw_params *params,
  74                                    struct snd_soc_dai *dai)
  75 {
  76         struct tegra210_dmic *dmic = snd_soc_dai_get_drvdata(dai);
  77         unsigned int srate, clk_rate, channels;
  78         struct tegra_cif_conf cif_conf;
  79         unsigned long long gain_q23 = DEFAULT_GAIN_Q23;
  80         int err;
  81
  82         memset(&cif_conf, 0, sizeof(struct tegra_cif_conf));
  83
  84         channels = params_channels(params);
  85
  86         cif_conf.audio_ch = channels;
  87
  88         switch (dmic->ch_select) {
  89         case DMIC_CH_SELECT_LEFT:
  90         case DMIC_CH_SELECT_RIGHT:
  91                 cif_conf.client_ch = 1;
  92                 break;
  93         case DMIC_CH_SELECT_STEREO:
  94                 cif_conf.client_ch = 2;
  95                 break;
  96         default:
  97                 dev_err(dai->dev, "invalid DMIC client channels\n");
  98                 return -EINVAL;
  99         }
 100
 101         srate = params_rate(params);
 102
 103         /*
 104          * DMIC clock rate is a multiple of 'Over Sampling Ratio' and
 105          * 'Sample Rate'. The supported OSR values are 64, 128 and 256.
 106          */
 107         clk_rate = (DMIC_OSR_FACTOR << dmic->osr_val) * srate;
 108
 109         err = clk_set_rate(dmic->clk_dmic, clk_rate);
 110         if (err) {
 111                 dev_err(dai->dev, "can't set DMIC clock rate %u, err: %d\n",
 112                         clk_rate, err);
 113                 return err;
 114         }
 115
 116         regmap_update_bits(dmic->regmap,
 117                            /* Reg */
 118                            TEGRA210_DMIC_CTRL,
 119                            /* Mask */
 120                            TEGRA210_DMIC_CTRL_LRSEL_POLARITY_MASK |
 121                            TEGRA210_DMIC_CTRL_OSR_MASK |
 122                            TEGRA210_DMIC_CTRL_CHANNEL_SELECT_MASK,
 123                            /* Value */
 124                            (dmic->lrsel << LRSEL_POL_SHIFT) |
 125                            (dmic->osr_val << OSR_SHIFT) |
 126                            ((dmic->ch_select + 1) << CH_SEL_SHIFT));
 127
 128         /*
 129          * Use LP filter gain register to apply boost.
 130          * Boost Gain Volume control has 100x factor.
 131          */
 132         if (dmic->boost_gain)
 133                 gain_q23 = div_u64(gain_q23 * dmic->boost_gain, 100);
 134
 135         regmap_write(dmic->regmap, TEGRA210_DMIC_LP_FILTER_GAIN,
 136                      (unsigned int)gain_q23);
 137
 138         switch (params_format(params)) {
 139         case SNDRV_PCM_FORMAT_S16_LE:
 140                 cif_conf.audio_bits = TEGRA_ACIF_BITS_16;
 141                 break;
 142         case SNDRV_PCM_FORMAT_S32_LE:
 143                 cif_conf.audio_bits = TEGRA_ACIF_BITS_32;
 144                 break;
 145         default:
 146                 dev_err(dai->dev, "unsupported format!\n");
 147                 return -EOPNOTSUPP;
 148         }
 149
 150         cif_conf.client_bits = TEGRA_ACIF_BITS_24;
 151         cif_conf.mono_conv = dmic->mono_to_stereo;
 152         cif_conf.stereo_conv = dmic->stereo_to_mono;
 153
 154         tegra_set_cif(dmic->regmap, TEGRA210_DMIC_TX_CIF_CTRL, &cif_conf);
 155
 156         return 0;
 157 }
 158
 159 static int tegra210_dmic_get_control(struct snd_kcontrol *kcontrol,
 160                                      struct snd_ctl_elem_value *ucontrol)
 161 {
 162         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 163         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 164
 165         if (strstr(kcontrol->id.name, "Boost Gain Volume"))
 166                 ucontrol->value.integer.value[0] = dmic->boost_gain;
 167         else if (strstr(kcontrol->id.name, "Channel Select"))
 168                 ucontrol->value.integer.value[0] = dmic->ch_select;
 169         else if (strstr(kcontrol->id.name, "Mono To Stereo"))
 170                 ucontrol->value.integer.value[0] = dmic->mono_to_stereo;
 171         else if (strstr(kcontrol->id.name, "Stereo To Mono"))
 172                 ucontrol->value.integer.value[0] = dmic->stereo_to_mono;
 173         else if (strstr(kcontrol->id.name, "OSR Value"))
 174                 ucontrol->value.integer.value[0] = dmic->osr_val;
 175         else if (strstr(kcontrol->id.name, "LR Polarity Select"))
 176                 ucontrol->value.integer.value[0] = dmic->lrsel;
 177
 178         return 0;
 179 }
 180
 181 static int tegra210_dmic_put_control(struct snd_kcontrol *kcontrol,
 182                                      struct snd_ctl_elem_value *ucontrol)
 183 {
 184         struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
 185         struct tegra210_dmic *dmic = snd_soc_component_get_drvdata(comp);
 186         int value = ucontrol->value.integer.value[0];
 187
 188         if (strstr(kcontrol->id.name, "Boost Gain Volume"))
 189                 dmic->boost_gain = value;
 190         else if (strstr(kcontrol->id.name, "Channel Select"))
 191                 dmic->ch_select = ucontrol->value.integer.value[0];
 192         else if (strstr(kcontrol->id.name, "Mono To Stereo"))
 193                 dmic->mono_to_stereo = value;
 194         else if (strstr(kcontrol->id.name, "Stereo To Mono"))
 195                 dmic->stereo_to_mono = value;
 196         else if (strstr(kcontrol->id.name, "OSR Value"))
 197                 dmic->osr_val = value;
 198         else if (strstr(kcontrol->id.name, "LR Polarity Select"))
 199                 dmic->lrsel = value;
 200
 201         return 0;
 202 }
 203
 204 static const struct snd_soc_dai_ops tegra210_dmic_dai_ops = {
 205         .hw_params      = tegra210_dmic_hw_params,
 206 };
 207
 208 static struct snd_soc_dai_driver tegra210_dmic_dais[] = {
 209         {
 210                 .name = "DMIC-CIF",
 211                 .capture = {
 212                         .stream_name = "CIF-Capture",
 213                         .channels_min = 1,
 214                         .channels_max = 2,
 215                         .rates = SNDRV_PCM_RATE_8000_48000,
 216                         .formats = SNDRV_PCM_FMTBIT_S16_LE |
 217                                    SNDRV_PCM_FMTBIT_S32_LE,
 218                 },
 219         },
 220         {
 221                 .name = "DMIC-DAP",
 222                 .capture = {
 223                         .stream_name = "DAP-Capture",
 224                         .channels_min = 1,
 225                         .channels_max = 2,
 226                         .rates = SNDRV_PCM_RATE_8000_48000,
 227                         .formats = SNDRV_PCM_FMTBIT_S16_LE |
 228                                    SNDRV_PCM_FMTBIT_S32_LE,
 229                 },
 230                 .ops = &tegra210_dmic_dai_ops,
 231                 .symmetric_rates = 1,
 232         },
 233 };
 234
 235 static const struct snd_soc_dapm_widget tegra210_dmic_widgets[] = {
 236         SND_SOC_DAPM_AIF_OUT("TX", NULL, 0, TEGRA210_DMIC_ENABLE, 0, 0),
 237         SND_SOC_DAPM_MIC("MIC", NULL),
 238 };
 239
 240 static const struct snd_soc_dapm_route tegra210_dmic_routes[] = {
 241         { "XBAR-RX",            NULL,   "XBAR-Capture" },
 242         { "XBAR-Capture",       NULL,   "CIF-Capture" },
 243         { "CIF-Capture",        NULL,   "TX" },
 244         { "TX",                 NULL,   "DAP-Capture" },
 245         { "DAP-Capture",        NULL,   "MIC" },
 246 };
 247
 248 static const char * const tegra210_dmic_ch_select[] = {
 249         "Left", "Right", "Stereo",
 250 };
 251
 252 static const struct soc_enum tegra210_dmic_ch_enum =
 253         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_ch_select),
 254                         tegra210_dmic_ch_select);
 255
 256 static const char * const tegra210_dmic_mono_conv_text[] = {
 257         "Zero", "Copy",
 258 };
 259
 260 static const char * const tegra210_dmic_stereo_conv_text[] = {
 261         "CH0", "CH1", "AVG",
 262 };
 263
 264 static const struct soc_enum tegra210_dmic_mono_conv_enum =
 265         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_mono_conv_text),
 266                         tegra210_dmic_mono_conv_text);
 267
 268 static const struct soc_enum tegra210_dmic_stereo_conv_enum =
 269         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_stereo_conv_text),
 270                         tegra210_dmic_stereo_conv_text);
 271
 272 static const char * const tegra210_dmic_osr_text[] = {
 273         "OSR_64", "OSR_128", "OSR_256",
 274 };
 275
 276 static const struct soc_enum tegra210_dmic_osr_enum =
 277         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_osr_text),
 278                         tegra210_dmic_osr_text);
 279
 280 static const char * const tegra210_dmic_lrsel_text[] = {
 281         "Left", "Right",
 282 };
 283
 284 static const struct soc_enum tegra210_dmic_lrsel_enum =
 285         SOC_ENUM_SINGLE(0, 0, ARRAY_SIZE(tegra210_dmic_lrsel_text),
 286                         tegra210_dmic_lrsel_text);
 287
 288 static const struct snd_kcontrol_new tegra210_dmic_controls[] = {
 289         SOC_SINGLE_EXT("Boost Gain Volume", 0, 0, MAX_BOOST_GAIN, 0,
 290                        tegra210_dmic_get_control, tegra210_dmic_put_control),
 291         SOC_ENUM_EXT("Channel Select", tegra210_dmic_ch_enum,
 292                      tegra210_dmic_get_control, tegra210_dmic_put_control),
 293         SOC_ENUM_EXT("Mono To Stereo",
 294                      tegra210_dmic_mono_conv_enum, tegra210_dmic_get_control,
 295                      tegra210_dmic_put_control),
 296         SOC_ENUM_EXT("Stereo To Mono",
 297                      tegra210_dmic_stereo_conv_enum, tegra210_dmic_get_control,
 298                      tegra210_dmic_put_control),
 299         SOC_ENUM_EXT("OSR Value", tegra210_dmic_osr_enum,
 300                      tegra210_dmic_get_control, tegra210_dmic_put_control),
 301         SOC_ENUM_EXT("LR Polarity Select", tegra210_dmic_lrsel_enum,
 302                      tegra210_dmic_get_control, tegra210_dmic_put_control),
 303 };
 304
 305 static const struct snd_soc_component_driver tegra210_dmic_compnt = {
 306         .dapm_widgets           = tegra210_dmic_widgets,
 307         .num_dapm_widgets       = ARRAY_SIZE(tegra210_dmic_widgets),
 308         .dapm_routes            = tegra210_dmic_routes,
 309         .num_dapm_routes        = ARRAY_SIZE(tegra210_dmic_routes),
 310         .controls               = tegra210_dmic_controls,
 311         .num_controls           = ARRAY_SIZE(tegra210_dmic_controls),
 312 };
 313
 314 static bool tegra210_dmic_wr_reg(struct device *dev, unsigned int reg)
 315 {
 316         switch (reg) {
 317         case TEGRA210_DMIC_TX_INT_MASK ... TEGRA210_DMIC_TX_CIF_CTRL:
 318         case TEGRA210_DMIC_ENABLE ... TEGRA210_DMIC_CG:
 319         case TEGRA210_DMIC_CTRL:
 320         case TEGRA210_DMIC_DBG_CTRL:
 321         case TEGRA210_DMIC_DCR_BIQUAD_0_COEF_4 ... TEGRA210_DMIC_LP_BIQUAD_1_COEF_4:
 322                 return true;
 323         default:
 324                 return false;
 325         }
 326 }
 327
 328 static bool tegra210_dmic_rd_reg(struct device *dev, unsigned int reg)
 329 {
 330         if (tegra210_dmic_wr_reg(dev, reg))
 331                 return true;
 332
 333         switch (reg) {
 334         case TEGRA210_DMIC_TX_STATUS:
 335         case TEGRA210_DMIC_TX_INT_STATUS:
 336         case TEGRA210_DMIC_STATUS:
 337         case TEGRA210_DMIC_INT_STATUS:
 338                 return true;
 339         default:
 340                 return false;
 341         }
 342 }
 343
 344 static bool tegra210_dmic_volatile_reg(struct device *dev, unsigned int reg)
 345 {
 346         switch (reg) {
 347         case TEGRA210_DMIC_TX_STATUS:
 348         case TEGRA210_DMIC_TX_INT_STATUS:
 349         case TEGRA210_DMIC_TX_INT_SET:
 350         case TEGRA210_DMIC_SOFT_RESET:
 351         case TEGRA210_DMIC_STATUS:
 352         case TEGRA210_DMIC_INT_STATUS:
 353                 return true;
 354         default:
 355                 return false;
 356         }
 357 }
 358
 359 static const struct regmap_config tegra210_dmic_regmap_config = {
 360         .reg_bits = 32,
 361         .reg_stride = 4,
 362         .val_bits = 32,
 363         .max_register = TEGRA210_DMIC_LP_BIQUAD_1_COEF_4,
 364         .writeable_reg = tegra210_dmic_wr_reg,
 365         .readable_reg = tegra210_dmic_rd_reg,
 366         .volatile_reg = tegra210_dmic_volatile_reg,
 367         .reg_defaults = tegra210_dmic_reg_defaults,
 368         .num_reg_defaults = ARRAY_SIZE(tegra210_dmic_reg_defaults),
 369         .cache_type = REGCACHE_FLAT,
 370 };
 371
 372 static int tegra210_dmic_probe(struct platform_device *pdev)
 373 {
 374         struct device *dev = &pdev->dev;
 375         struct tegra210_dmic *dmic;
 376         void __iomem *regs;
 377         int err;
 378
 379         dmic = devm_kzalloc(dev, sizeof(*dmic), GFP_KERNEL);
 380         if (!dmic)
 381                 return -ENOMEM;
 382
 383         dmic->osr_val = DMIC_OSR_64;
 384         dmic->ch_select = DMIC_CH_SELECT_STEREO;
 385         dmic->lrsel = DMIC_LRSEL_LEFT;
 386         dmic->boost_gain = 0;
 387         dmic->stereo_to_mono = 0; /* "CH0" */
 388
 389         dev_set_drvdata(dev, dmic);
 390
 391         dmic->clk_dmic = devm_clk_get(dev, "dmic");
 392         if (IS_ERR(dmic->clk_dmic)) {
 393                 dev_err(dev, "can't retrieve DMIC clock\n");
 394                 return PTR_ERR(dmic->clk_dmic);
 395         }
 396
 397         regs = devm_platform_ioremap_resource(pdev, 0);
 398         if (IS_ERR(regs))
 399                 return PTR_ERR(regs);
 400
 401         dmic->regmap = devm_regmap_init_mmio(dev, regs,
 402                                              &tegra210_dmic_regmap_config);
 403         if (IS_ERR(dmic->regmap)) {
 404                 dev_err(dev, "regmap init failed\n");
 405                 return PTR_ERR(dmic->regmap);
 406         }
 407
 408         regcache_cache_only(dmic->regmap, true);
 409
 410         err = devm_snd_soc_register_component(dev, &tegra210_dmic_compnt,
 411                                               tegra210_dmic_dais,
 412                                               ARRAY_SIZE(tegra210_dmic_dais));
 413         if (err) {
 414                 dev_err(dev, "can't register DMIC component, err: %d\n", err);
 415                 return err;
 416         }
 417
 418         pm_runtime_enable(dev);
 419
 420         return 0;
 421 }
 422
 423 static int tegra210_dmic_remove(struct platform_device *pdev)
 424 {
 425         pm_runtime_disable(&pdev->dev);
 426
 427         return 0;
 428 }
 429
 430 static const struct dev_pm_ops tegra210_dmic_pm_ops = {
 431         SET_RUNTIME_PM_OPS(tegra210_dmic_runtime_suspend,
 432                            tegra210_dmic_runtime_resume, NULL)
 433         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 434                                 pm_runtime_force_resume)
 435 };
 436
 437 static const struct of_device_id tegra210_dmic_of_match[] = {
 438         { .compatible = "nvidia,tegra210-dmic" },
 439         {},
 440 };
 441 MODULE_DEVICE_TABLE(of, tegra210_dmic_of_match);
 442
 443 static struct platform_driver tegra210_dmic_driver = {
 444         .driver = {
 445                 .name = "tegra210-dmic",
 446                 .of_match_table = tegra210_dmic_of_match,
 447                 .pm = &tegra210_dmic_pm_ops,
 448         },
 449         .probe = tegra210_dmic_probe,
 450         .remove = tegra210_dmic_remove,
 451 };
 452 module_platform_driver(tegra210_dmic_driver)
 453
 454 MODULE_AUTHOR("Rahul Mittal <rmittal@nvidia.com>");
 455 MODULE_DESCRIPTION("Tegra210 ASoC DMIC driver");
 456 MODULE_LICENSE("GPL v2");