sound/soc/omap/omap-dmic.c

   1 /*
   2  * omap-dmic.c  --  OMAP ASoC DMIC DAI driver
   3  *
   4  * Copyright (C) 2010 - 2011 Texas Instruments
   5  *
   6  * Author: David Lambert <dlambert@ti.com>
   7  *         Misael Lopez Cruz <misael.lopez@ti.com>
   8  *         Liam Girdwood <lrg@ti.com>
   9  *         Peter Ujfalusi <peter.ujfalusi@ti.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * version 2 as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  23  * 02110-1301 USA
  24  *
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/module.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/err.h>
  31 #include <linux/clk.h>
  32 #include <linux/io.h>
  33 #include <linux/slab.h>
  34 #include <linux/pm_runtime.h>
  35 #include <linux/of_device.h>
  36
  37 #include <sound/core.h>
  38 #include <sound/pcm.h>
  39 #include <sound/pcm_params.h>
  40 #include <sound/initval.h>
  41 #include <sound/soc.h>
  42 #include <sound/dmaengine_pcm.h>
  43 #include <sound/omap-pcm.h>
  44
  45 #include "omap-dmic.h"
  46
  47 struct omap_dmic {
  48         struct device *dev;
  49         void __iomem *io_base;
  50         struct clk *fclk;
  51         struct pm_qos_request pm_qos_req;
  52         int latency;
  53         int fclk_freq;
  54         int out_freq;
  55         int clk_div;
  56         int sysclk;
  57         int threshold;
  58         u32 ch_enabled;
  59         bool active;
  60         struct mutex mutex;
  61
  62         struct snd_dmaengine_dai_dma_data dma_data;
  63 };
  64
  65 static inline void omap_dmic_write(struct omap_dmic *dmic, u16 reg, u32 val)
  66 {
  67         writel_relaxed(val, dmic->io_base + reg);
  68 }
  69
  70 static inline int omap_dmic_read(struct omap_dmic *dmic, u16 reg)
  71 {
  72         return readl_relaxed(dmic->io_base + reg);
  73 }
  74
  75 static inline void omap_dmic_start(struct omap_dmic *dmic)
  76 {
  77         u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
  78
  79         /* Configure DMA controller */
  80         omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_SET_REG,
  81                         OMAP_DMIC_DMA_ENABLE);
  82
  83         omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl | dmic->ch_enabled);
  84 }
  85
  86 static inline void omap_dmic_stop(struct omap_dmic *dmic)
  87 {
  88         u32 ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
  89         omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
  90                         ctrl & ~OMAP_DMIC_UP_ENABLE_MASK);
  91
  92         /* Disable DMA request generation */
  93         omap_dmic_write(dmic, OMAP_DMIC_DMAENABLE_CLR_REG,
  94                         OMAP_DMIC_DMA_ENABLE);
  95
  96 }
  97
  98 static inline int dmic_is_enabled(struct omap_dmic *dmic)
  99 {
 100         return omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG) &
 101                                                 OMAP_DMIC_UP_ENABLE_MASK;
 102 }
 103
 104 static int omap_dmic_dai_startup(struct snd_pcm_substream *substream,
 105                                   struct snd_soc_dai *dai)
 106 {
 107         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 108         int ret = 0;
 109
 110         mutex_lock(&dmic->mutex);
 111
 112         if (!dai->active)
 113                 dmic->active = 1;
 114         else
 115                 ret = -EBUSY;
 116
 117         mutex_unlock(&dmic->mutex);
 118
 119         return ret;
 120 }
 121
 122 static void omap_dmic_dai_shutdown(struct snd_pcm_substream *substream,
 123                                     struct snd_soc_dai *dai)
 124 {
 125         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 126
 127         mutex_lock(&dmic->mutex);
 128
 129         pm_qos_remove_request(&dmic->pm_qos_req);
 130
 131         if (!dai->active)
 132                 dmic->active = 0;
 133
 134         mutex_unlock(&dmic->mutex);
 135 }
 136
 137 static int omap_dmic_select_divider(struct omap_dmic *dmic, int sample_rate)
 138 {
 139         int divider = -EINVAL;
 140
 141         /*
 142          * 192KHz rate is only supported with 19.2MHz/3.84MHz clock
 143          * configuration.
 144          */
 145         if (sample_rate == 192000) {
 146                 if (dmic->fclk_freq == 19200000 && dmic->out_freq == 3840000)
 147                         divider = 0x6; /* Divider: 5 (192KHz sampling rate) */
 148                 else
 149                         dev_err(dmic->dev,
 150                                 "invalid clock configuration for 192KHz\n");
 151
 152                 return divider;
 153         }
 154
 155         switch (dmic->out_freq) {
 156         case 1536000:
 157                 if (dmic->fclk_freq != 24576000)
 158                         goto div_err;
 159                 divider = 0x4; /* Divider: 16 */
 160                 break;
 161         case 2400000:
 162                 switch (dmic->fclk_freq) {
 163                 case 12000000:
 164                         divider = 0x5; /* Divider: 5 */
 165                         break;
 166                 case 19200000:
 167                         divider = 0x0; /* Divider: 8 */
 168                         break;
 169                 case 24000000:
 170                         divider = 0x2; /* Divider: 10 */
 171                         break;
 172                 default:
 173                         goto div_err;
 174                 }
 175                 break;
 176         case 3072000:
 177                 if (dmic->fclk_freq != 24576000)
 178                         goto div_err;
 179                 divider = 0x3; /* Divider: 8 */
 180                 break;
 181         case 3840000:
 182                 if (dmic->fclk_freq != 19200000)
 183                         goto div_err;
 184                 divider = 0x1; /* Divider: 5 (96KHz sampling rate) */
 185                 break;
 186         default:
 187                 dev_err(dmic->dev, "invalid out frequency: %dHz\n",
 188                         dmic->out_freq);
 189                 break;
 190         }
 191
 192         return divider;
 193
 194 div_err:
 195         dev_err(dmic->dev, "invalid out frequency %dHz for %dHz input\n",
 196                 dmic->out_freq, dmic->fclk_freq);
 197         return -EINVAL;
 198 }
 199
 200 static int omap_dmic_dai_hw_params(struct snd_pcm_substream *substream,
 201                                     struct snd_pcm_hw_params *params,
 202                                     struct snd_soc_dai *dai)
 203 {
 204         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 205         struct snd_dmaengine_dai_dma_data *dma_data;
 206         int channels;
 207
 208         dmic->clk_div = omap_dmic_select_divider(dmic, params_rate(params));
 209         if (dmic->clk_div < 0) {
 210                 dev_err(dmic->dev, "no valid divider for %dHz from %dHz\n",
 211                         dmic->out_freq, dmic->fclk_freq);
 212                 return -EINVAL;
 213         }
 214
 215         dmic->ch_enabled = 0;
 216         channels = params_channels(params);
 217         switch (channels) {
 218         case 6:
 219                 dmic->ch_enabled |= OMAP_DMIC_UP3_ENABLE;
 220         case 4:
 221                 dmic->ch_enabled |= OMAP_DMIC_UP2_ENABLE;
 222         case 2:
 223                 dmic->ch_enabled |= OMAP_DMIC_UP1_ENABLE;
 224                 break;
 225         default:
 226                 dev_err(dmic->dev, "invalid number of legacy channels\n");
 227                 return -EINVAL;
 228         }
 229
 230         /* packet size is threshold * channels */
 231         dma_data = snd_soc_dai_get_dma_data(dai, substream);
 232         dma_data->maxburst = dmic->threshold * channels;
 233         dmic->latency = (OMAP_DMIC_THRES_MAX - dmic->threshold) * USEC_PER_SEC /
 234                         params_rate(params);
 235
 236         return 0;
 237 }
 238
 239 static int omap_dmic_dai_prepare(struct snd_pcm_substream *substream,
 240                                   struct snd_soc_dai *dai)
 241 {
 242         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 243         u32 ctrl;
 244
 245         if (pm_qos_request_active(&dmic->pm_qos_req))
 246                 pm_qos_update_request(&dmic->pm_qos_req, dmic->latency);
 247
 248         /* Configure uplink threshold */
 249         omap_dmic_write(dmic, OMAP_DMIC_FIFO_CTRL_REG, dmic->threshold);
 250
 251         ctrl = omap_dmic_read(dmic, OMAP_DMIC_CTRL_REG);
 252
 253         /* Set dmic out format */
 254         ctrl &= ~(OMAP_DMIC_FORMAT | OMAP_DMIC_POLAR_MASK);
 255         ctrl |= (OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
 256                  OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);
 257
 258         /* Configure dmic clock divider */
 259         ctrl &= ~OMAP_DMIC_CLK_DIV_MASK;
 260         ctrl |= OMAP_DMIC_CLK_DIV(dmic->clk_div);
 261
 262         omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, ctrl);
 263
 264         omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG,
 265                         ctrl | OMAP_DMICOUTFORMAT_LJUST | OMAP_DMIC_POLAR1 |
 266                         OMAP_DMIC_POLAR2 | OMAP_DMIC_POLAR3);
 267
 268         return 0;
 269 }
 270
 271 static int omap_dmic_dai_trigger(struct snd_pcm_substream *substream,
 272                                   int cmd, struct snd_soc_dai *dai)
 273 {
 274         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 275
 276         switch (cmd) {
 277         case SNDRV_PCM_TRIGGER_START:
 278                 omap_dmic_start(dmic);
 279                 break;
 280         case SNDRV_PCM_TRIGGER_STOP:
 281                 omap_dmic_stop(dmic);
 282                 break;
 283         default:
 284                 break;
 285         }
 286
 287         return 0;
 288 }
 289
 290 static int omap_dmic_select_fclk(struct omap_dmic *dmic, int clk_id,
 291                                  unsigned int freq)
 292 {
 293         struct clk *parent_clk;
 294         char *parent_clk_name;
 295         int ret = 0;
 296
 297         switch (freq) {
 298         case 12000000:
 299         case 19200000:
 300         case 24000000:
 301         case 24576000:
 302                 break;
 303         default:
 304                 dev_err(dmic->dev, "invalid input frequency: %dHz\n", freq);
 305                 dmic->fclk_freq = 0;
 306                 return -EINVAL;
 307         }
 308
 309         if (dmic->sysclk == clk_id) {
 310                 dmic->fclk_freq = freq;
 311                 return 0;
 312         }
 313
 314         /* re-parent not allowed if a stream is ongoing */
 315         if (dmic->active && dmic_is_enabled(dmic)) {
 316                 dev_err(dmic->dev, "can't re-parent when DMIC active\n");
 317                 return -EBUSY;
 318         }
 319
 320         switch (clk_id) {
 321         case OMAP_DMIC_SYSCLK_PAD_CLKS:
 322                 parent_clk_name = "pad_clks_ck";
 323                 break;
 324         case OMAP_DMIC_SYSCLK_SLIMBLUS_CLKS:
 325                 parent_clk_name = "slimbus_clk";
 326                 break;
 327         case OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS:
 328                 parent_clk_name = "dmic_sync_mux_ck";
 329                 break;
 330         default:
 331                 dev_err(dmic->dev, "fclk clk_id (%d) not supported\n", clk_id);
 332                 return -EINVAL;
 333         }
 334
 335         parent_clk = clk_get(dmic->dev, parent_clk_name);
 336         if (IS_ERR(parent_clk)) {
 337                 dev_err(dmic->dev, "can't get %s\n", parent_clk_name);
 338                 return -ENODEV;
 339         }
 340
 341         mutex_lock(&dmic->mutex);
 342         if (dmic->active) {
 343                 /* disable clock while reparenting */
 344                 pm_runtime_put_sync(dmic->dev);
 345                 ret = clk_set_parent(dmic->fclk, parent_clk);
 346                 pm_runtime_get_sync(dmic->dev);
 347         } else {
 348                 ret = clk_set_parent(dmic->fclk, parent_clk);
 349         }
 350         mutex_unlock(&dmic->mutex);
 351
 352         if (ret < 0) {
 353                 dev_err(dmic->dev, "re-parent failed\n");
 354                 goto err_busy;
 355         }
 356
 357         dmic->sysclk = clk_id;
 358         dmic->fclk_freq = freq;
 359
 360 err_busy:
 361         clk_put(parent_clk);
 362
 363         return ret;
 364 }
 365
 366 static int omap_dmic_select_outclk(struct omap_dmic *dmic, int clk_id,
 367                                     unsigned int freq)
 368 {
 369         int ret = 0;
 370
 371         if (clk_id != OMAP_DMIC_ABE_DMIC_CLK) {
 372                 dev_err(dmic->dev, "output clk_id (%d) not supported\n",
 373                         clk_id);
 374                 return -EINVAL;
 375         }
 376
 377         switch (freq) {
 378         case 1536000:
 379         case 2400000:
 380         case 3072000:
 381         case 3840000:
 382                 dmic->out_freq = freq;
 383                 break;
 384         default:
 385                 dev_err(dmic->dev, "invalid out frequency: %dHz\n", freq);
 386                 dmic->out_freq = 0;
 387                 ret = -EINVAL;
 388         }
 389
 390         return ret;
 391 }
 392
 393 static int omap_dmic_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id,
 394                                     unsigned int freq, int dir)
 395 {
 396         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 397
 398         if (dir == SND_SOC_CLOCK_IN)
 399                 return omap_dmic_select_fclk(dmic, clk_id, freq);
 400         else if (dir == SND_SOC_CLOCK_OUT)
 401                 return omap_dmic_select_outclk(dmic, clk_id, freq);
 402
 403         dev_err(dmic->dev, "invalid clock direction (%d)\n", dir);
 404         return -EINVAL;
 405 }
 406
 407 static const struct snd_soc_dai_ops omap_dmic_dai_ops = {
 408         .startup        = omap_dmic_dai_startup,
 409         .shutdown       = omap_dmic_dai_shutdown,
 410         .hw_params      = omap_dmic_dai_hw_params,
 411         .prepare        = omap_dmic_dai_prepare,
 412         .trigger        = omap_dmic_dai_trigger,
 413         .set_sysclk     = omap_dmic_set_dai_sysclk,
 414 };
 415
 416 static int omap_dmic_probe(struct snd_soc_dai *dai)
 417 {
 418         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 419
 420         pm_runtime_enable(dmic->dev);
 421
 422         /* Disable lines while request is ongoing */
 423         pm_runtime_get_sync(dmic->dev);
 424         omap_dmic_write(dmic, OMAP_DMIC_CTRL_REG, 0x00);
 425         pm_runtime_put_sync(dmic->dev);
 426
 427         /* Configure DMIC threshold value */
 428         dmic->threshold = OMAP_DMIC_THRES_MAX - 3;
 429
 430         snd_soc_dai_init_dma_data(dai, NULL, &dmic->dma_data);
 431
 432         return 0;
 433 }
 434
 435 static int omap_dmic_remove(struct snd_soc_dai *dai)
 436 {
 437         struct omap_dmic *dmic = snd_soc_dai_get_drvdata(dai);
 438
 439         pm_runtime_disable(dmic->dev);
 440
 441         return 0;
 442 }
 443
 444 static struct snd_soc_dai_driver omap_dmic_dai = {
 445         .name = "omap-dmic",
 446         .probe = omap_dmic_probe,
 447         .remove = omap_dmic_remove,
 448         .capture = {
 449                 .channels_min = 2,
 450                 .channels_max = 6,
 451                 .rates = SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_192000,
 452                 .formats = SNDRV_PCM_FMTBIT_S32_LE,
 453                 .sig_bits = 24,
 454         },
 455         .ops = &omap_dmic_dai_ops,
 456 };
 457
 458 static const struct snd_soc_component_driver omap_dmic_component = {
 459         .name           = "omap-dmic",
 460 };
 461
 462 static int asoc_dmic_probe(struct platform_device *pdev)
 463 {
 464         struct omap_dmic *dmic;
 465         struct resource *res;
 466         int ret;
 467
 468         dmic = devm_kzalloc(&pdev->dev, sizeof(struct omap_dmic), GFP_KERNEL);
 469         if (!dmic)
 470                 return -ENOMEM;
 471
 472         platform_set_drvdata(pdev, dmic);
 473         dmic->dev = &pdev->dev;
 474         dmic->sysclk = OMAP_DMIC_SYSCLK_SYNC_MUX_CLKS;
 475
 476         mutex_init(&dmic->mutex);
 477
 478         dmic->fclk = devm_clk_get(dmic->dev, "fck");
 479         if (IS_ERR(dmic->fclk)) {
 480                 dev_err(dmic->dev, "cant get fck\n");
 481                 return -ENODEV;
 482         }
 483
 484         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 485         if (!res) {
 486                 dev_err(dmic->dev, "invalid dma memory resource\n");
 487                 return -ENODEV;
 488         }
 489         dmic->dma_data.addr = res->start + OMAP_DMIC_DATA_REG;
 490
 491         dmic->dma_data.filter_data = "up_link";
 492
 493         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 494         dmic->io_base = devm_ioremap_resource(&pdev->dev, res);
 495         if (IS_ERR(dmic->io_base))
 496                 return PTR_ERR(dmic->io_base);
 497
 498
 499         ret = devm_snd_soc_register_component(&pdev->dev,
 500                                               &omap_dmic_component,
 501                                               &omap_dmic_dai, 1);
 502         if (ret)
 503                 return ret;
 504
 505         ret = omap_pcm_platform_register(&pdev->dev);
 506         if (ret)
 507                 return ret;
 508
 509         return 0;
 510 }
 511
 512 static const struct of_device_id omap_dmic_of_match[] = {
 513         { .compatible = "ti,omap4-dmic", },
 514         { }
 515 };
 516 MODULE_DEVICE_TABLE(of, omap_dmic_of_match);
 517
 518 static struct platform_driver asoc_dmic_driver = {
 519         .driver = {
 520                 .name = "omap-dmic",
 521                 .of_match_table = omap_dmic_of_match,
 522         },
 523         .probe = asoc_dmic_probe,
 524 };
 525
 526 module_platform_driver(asoc_dmic_driver);
 527
 528 MODULE_ALIAS("platform:omap-dmic");
 529 MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 530 MODULE_DESCRIPTION("OMAP DMIC ASoC Interface");
 531 MODULE_LICENSE("GPL");