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