sound/soc/omap/omap-mcpdm.c

   1 /*
   2  * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
   3  *
   4  * Copyright (C) 2009 - 2011 Texas Instruments
   5  *
   6  * Author: Misael Lopez Cruz <misael.lopez@ti.com>
   7  * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
   8  *          Margarita Olaya <magi.olaya@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/interrupt.h>
  31 #include <linux/err.h>
  32 #include <linux/io.h>
  33 #include <linux/irq.h>
  34 #include <linux/slab.h>
  35 #include <linux/pm_runtime.h>
  36 #include <linux/of_device.h>
  37
  38 #include <sound/core.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include <sound/soc.h>
  42 #include <sound/dmaengine_pcm.h>
  43
  44 #include "omap-mcpdm.h"
  45 #include "sdma-pcm.h"
  46
  47 struct mcpdm_link_config {
  48         u32 link_mask; /* channel mask for the direction */
  49         u32 threshold; /* FIFO threshold */
  50 };
  51
  52 struct omap_mcpdm {
  53         struct device *dev;
  54         unsigned long phys_base;
  55         void __iomem *io_base;
  56         int irq;
  57
  58         struct mutex mutex;
  59
  60         /* Playback/Capture configuration */
  61         struct mcpdm_link_config config[2];
  62
  63         /* McPDM dn offsets for rx1, and 2 channels */
  64         u32 dn_rx_offset;
  65
  66         /* McPDM needs to be restarted due to runtime reconfiguration */
  67         bool restart;
  68
  69         /* pm state for suspend/resume handling */
  70         int pm_active_count;
  71
  72         struct snd_dmaengine_dai_dma_data dma_data[2];
  73 };
  74
  75 /*
  76  * Stream DMA parameters
  77  */
  78
  79 static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val)
  80 {
  81         writel_relaxed(val, mcpdm->io_base + reg);
  82 }
  83
  84 static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg)
  85 {
  86         return readl_relaxed(mcpdm->io_base + reg);
  87 }
  88
  89 #ifdef DEBUG
  90 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm)
  91 {
  92         dev_dbg(mcpdm->dev, "***********************\n");
  93         dev_dbg(mcpdm->dev, "IRQSTATUS_RAW:  0x%04x\n",
  94                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS_RAW));
  95         dev_dbg(mcpdm->dev, "IRQSTATUS:  0x%04x\n",
  96                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS));
  97         dev_dbg(mcpdm->dev, "IRQENABLE_SET:  0x%04x\n",
  98                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_SET));
  99         dev_dbg(mcpdm->dev, "IRQENABLE_CLR:  0x%04x\n",
 100                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_CLR));
 101         dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
 102                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQWAKE_EN));
 103         dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
 104                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_SET));
 105         dev_dbg(mcpdm->dev, "DMAENABLE_CLR:  0x%04x\n",
 106                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_CLR));
 107         dev_dbg(mcpdm->dev, "DMAWAKEEN:  0x%04x\n",
 108                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAWAKEEN));
 109         dev_dbg(mcpdm->dev, "CTRL:  0x%04x\n",
 110                         omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL));
 111         dev_dbg(mcpdm->dev, "DN_DATA:  0x%04x\n",
 112                         omap_mcpdm_read(mcpdm, MCPDM_REG_DN_DATA));
 113         dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
 114                         omap_mcpdm_read(mcpdm, MCPDM_REG_UP_DATA));
 115         dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
 116                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_DN));
 117         dev_dbg(mcpdm->dev, "FIFO_CTRL_UP:  0x%04x\n",
 118                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_UP));
 119         dev_dbg(mcpdm->dev, "***********************\n");
 120 }
 121 #else
 122 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) {}
 123 #endif
 124
 125 /*
 126  * Enables the transfer through the PDM interface to/from the Phoenix
 127  * codec by enabling the corresponding UP or DN channels.
 128  */
 129 static void omap_mcpdm_start(struct omap_mcpdm *mcpdm)
 130 {
 131         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 132         u32 link_mask = mcpdm->config[0].link_mask | mcpdm->config[1].link_mask;
 133
 134         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 135         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 136
 137         ctrl |= link_mask;
 138         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 139
 140         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 141         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 142 }
 143
 144 /*
 145  * Disables the transfer through the PDM interface to/from the Phoenix
 146  * codec by disabling the corresponding UP or DN channels.
 147  */
 148 static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm)
 149 {
 150         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 151         u32 link_mask = MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK;
 152
 153         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 154         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 155
 156         ctrl &= ~(link_mask);
 157         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 158
 159         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 160         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 161
 162 }
 163
 164 /*
 165  * Is the physical McPDM interface active.
 166  */
 167 static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm)
 168 {
 169         return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) &
 170                                         (MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK);
 171 }
 172
 173 /*
 174  * Configures McPDM uplink, and downlink for audio.
 175  * This function should be called before omap_mcpdm_start.
 176  */
 177 static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm)
 178 {
 179         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 180
 181         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
 182
 183         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET,
 184                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
 185                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 186
 187         /* Enable DN RX1/2 offset cancellation feature, if configured */
 188         if (mcpdm->dn_rx_offset) {
 189                 u32 dn_offset = mcpdm->dn_rx_offset;
 190
 191                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 192                 dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
 193                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 194         }
 195
 196         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN,
 197                          mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold);
 198         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP,
 199                          mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold);
 200
 201         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET,
 202                         MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE);
 203 }
 204
 205 /*
 206  * Cleans McPDM uplink, and downlink configuration.
 207  * This function should be called when the stream is closed.
 208  */
 209 static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
 210 {
 211         /* Disable irq request generation for downlink */
 212         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 213                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL);
 214
 215         /* Disable DMA request generation for downlink */
 216         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE);
 217
 218         /* Disable irq request generation for uplink */
 219         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 220                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 221
 222         /* Disable DMA request generation for uplink */
 223         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
 224
 225         /* Disable RX1/2 offset cancellation */
 226         if (mcpdm->dn_rx_offset)
 227                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
 228 }
 229
 230 static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
 231 {
 232         struct omap_mcpdm *mcpdm = dev_id;
 233         int irq_status;
 234
 235         irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS);
 236
 237         /* Acknowledge irq event */
 238         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status);
 239
 240         if (irq_status & MCPDM_DN_IRQ_FULL)
 241                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n");
 242
 243         if (irq_status & MCPDM_DN_IRQ_EMPTY)
 244                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n");
 245
 246         if (irq_status & MCPDM_DN_IRQ)
 247                 dev_dbg(mcpdm->dev, "DN (playback) write request\n");
 248
 249         if (irq_status & MCPDM_UP_IRQ_FULL)
 250                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n");
 251
 252         if (irq_status & MCPDM_UP_IRQ_EMPTY)
 253                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n");
 254
 255         if (irq_status & MCPDM_UP_IRQ)
 256                 dev_dbg(mcpdm->dev, "UP (capture) write request\n");
 257
 258         return IRQ_HANDLED;
 259 }
 260
 261 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
 262                                   struct snd_soc_dai *dai)
 263 {
 264         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 265
 266         mutex_lock(&mcpdm->mutex);
 267
 268         if (!dai->active)
 269                 omap_mcpdm_open_streams(mcpdm);
 270
 271         mutex_unlock(&mcpdm->mutex);
 272
 273         return 0;
 274 }
 275
 276 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 277                                   struct snd_soc_dai *dai)
 278 {
 279         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 280
 281         mutex_lock(&mcpdm->mutex);
 282
 283         if (!dai->active) {
 284                 if (omap_mcpdm_active(mcpdm)) {
 285                         omap_mcpdm_stop(mcpdm);
 286                         omap_mcpdm_close_streams(mcpdm);
 287                         mcpdm->config[0].link_mask = 0;
 288                         mcpdm->config[1].link_mask = 0;
 289                 }
 290         }
 291
 292         mutex_unlock(&mcpdm->mutex);
 293 }
 294
 295 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 296                                     struct snd_pcm_hw_params *params,
 297                                     struct snd_soc_dai *dai)
 298 {
 299         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 300         int stream = substream->stream;
 301         struct snd_dmaengine_dai_dma_data *dma_data;
 302         u32 threshold;
 303         int channels;
 304         int link_mask = 0;
 305
 306         channels = params_channels(params);
 307         switch (channels) {
 308         case 5:
 309                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 310                         /* up to 3 channels for capture */
 311                         return -EINVAL;
 312                 link_mask |= 1 << 4;
 313                 /* fall through */
 314         case 4:
 315                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 316                         /* up to 3 channels for capture */
 317                         return -EINVAL;
 318                 link_mask |= 1 << 3;
 319                 /* fall through */
 320         case 3:
 321                 link_mask |= 1 << 2;
 322                 /* fall through */
 323         case 2:
 324                 link_mask |= 1 << 1;
 325                 /* fall through */
 326         case 1:
 327                 link_mask |= 1 << 0;
 328                 break;
 329         default:
 330                 /* unsupported number of channels */
 331                 return -EINVAL;
 332         }
 333
 334         dma_data = snd_soc_dai_get_dma_data(dai, substream);
 335
 336         threshold = mcpdm->config[stream].threshold;
 337         /* Configure McPDM channels, and DMA packet size */
 338         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 339                 link_mask <<= 3;
 340
 341                 /* If capture is not running assume a stereo stream to come */
 342                 if (!mcpdm->config[!stream].link_mask)
 343                         mcpdm->config[!stream].link_mask = 0x3;
 344
 345                 dma_data->maxburst =
 346                                 (MCPDM_DN_THRES_MAX - threshold) * channels;
 347         } else {
 348                 /* If playback is not running assume a stereo stream to come */
 349                 if (!mcpdm->config[!stream].link_mask)
 350                         mcpdm->config[!stream].link_mask = (0x3 << 3);
 351
 352                 dma_data->maxburst = threshold * channels;
 353         }
 354
 355         /* Check if we need to restart McPDM with this stream */
 356         if (mcpdm->config[stream].link_mask &&
 357             mcpdm->config[stream].link_mask != link_mask)
 358                 mcpdm->restart = true;
 359
 360         mcpdm->config[stream].link_mask = link_mask;
 361
 362         return 0;
 363 }
 364
 365 static int omap_mcpdm_prepare(struct snd_pcm_substream *substream,
 366                                   struct snd_soc_dai *dai)
 367 {
 368         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 369
 370         if (!omap_mcpdm_active(mcpdm)) {
 371                 omap_mcpdm_start(mcpdm);
 372                 omap_mcpdm_reg_dump(mcpdm);
 373         } else if (mcpdm->restart) {
 374                 omap_mcpdm_stop(mcpdm);
 375                 omap_mcpdm_start(mcpdm);
 376                 mcpdm->restart = false;
 377                 omap_mcpdm_reg_dump(mcpdm);
 378         }
 379
 380         return 0;
 381 }
 382
 383 static const struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 384         .startup        = omap_mcpdm_dai_startup,
 385         .shutdown       = omap_mcpdm_dai_shutdown,
 386         .hw_params      = omap_mcpdm_dai_hw_params,
 387         .prepare        = omap_mcpdm_prepare,
 388 };
 389
 390 static int omap_mcpdm_probe(struct snd_soc_dai *dai)
 391 {
 392         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 393         int ret;
 394
 395         pm_runtime_enable(mcpdm->dev);
 396
 397         /* Disable lines while request is ongoing */
 398         pm_runtime_get_sync(mcpdm->dev);
 399         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00);
 400
 401         ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler, 0, "McPDM",
 402                           (void *)mcpdm);
 403
 404         pm_runtime_put_sync(mcpdm->dev);
 405
 406         if (ret) {
 407                 dev_err(mcpdm->dev, "Request for IRQ failed\n");
 408                 pm_runtime_disable(mcpdm->dev);
 409         }
 410
 411         /* Configure McPDM threshold values */
 412         mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold = 2;
 413         mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold =
 414                                                         MCPDM_UP_THRES_MAX - 3;
 415
 416         snd_soc_dai_init_dma_data(dai,
 417                                   &mcpdm->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
 418                                   &mcpdm->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
 419
 420         return ret;
 421 }
 422
 423 static int omap_mcpdm_remove(struct snd_soc_dai *dai)
 424 {
 425         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 426
 427         free_irq(mcpdm->irq, (void *)mcpdm);
 428         pm_runtime_disable(mcpdm->dev);
 429
 430         return 0;
 431 }
 432
 433 #ifdef CONFIG_PM_SLEEP
 434 static int omap_mcpdm_suspend(struct snd_soc_dai *dai)
 435 {
 436         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 437
 438         if (dai->active) {
 439                 omap_mcpdm_stop(mcpdm);
 440                 omap_mcpdm_close_streams(mcpdm);
 441         }
 442
 443         mcpdm->pm_active_count = 0;
 444         while (pm_runtime_active(mcpdm->dev)) {
 445                 pm_runtime_put_sync(mcpdm->dev);
 446                 mcpdm->pm_active_count++;
 447         }
 448
 449         return 0;
 450 }
 451
 452 static int omap_mcpdm_resume(struct snd_soc_dai *dai)
 453 {
 454         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 455
 456         if (mcpdm->pm_active_count) {
 457                 while (mcpdm->pm_active_count--)
 458                         pm_runtime_get_sync(mcpdm->dev);
 459
 460                 if (dai->active) {
 461                         omap_mcpdm_open_streams(mcpdm);
 462                         omap_mcpdm_start(mcpdm);
 463                 }
 464         }
 465
 466
 467         return 0;
 468 }
 469 #else
 470 #define omap_mcpdm_suspend NULL
 471 #define omap_mcpdm_resume NULL
 472 #endif
 473
 474 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 475 #define OMAP_MCPDM_FORMATS      SNDRV_PCM_FMTBIT_S32_LE
 476
 477 static struct snd_soc_dai_driver omap_mcpdm_dai = {
 478         .probe = omap_mcpdm_probe,
 479         .remove = omap_mcpdm_remove,
 480         .suspend = omap_mcpdm_suspend,
 481         .resume = omap_mcpdm_resume,
 482         .probe_order = SND_SOC_COMP_ORDER_LATE,
 483         .remove_order = SND_SOC_COMP_ORDER_EARLY,
 484         .playback = {
 485                 .channels_min = 1,
 486                 .channels_max = 5,
 487                 .rates = OMAP_MCPDM_RATES,
 488                 .formats = OMAP_MCPDM_FORMATS,
 489                 .sig_bits = 24,
 490         },
 491         .capture = {
 492                 .channels_min = 1,
 493                 .channels_max = 3,
 494                 .rates = OMAP_MCPDM_RATES,
 495                 .formats = OMAP_MCPDM_FORMATS,
 496                 .sig_bits = 24,
 497         },
 498         .ops = &omap_mcpdm_dai_ops,
 499 };
 500
 501 static const struct snd_soc_component_driver omap_mcpdm_component = {
 502         .name           = "omap-mcpdm",
 503 };
 504
 505 void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
 506                                     u8 rx1, u8 rx2)
 507 {
 508         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 509
 510         mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2);
 511 }
 512 EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets);
 513
 514 static int asoc_mcpdm_probe(struct platform_device *pdev)
 515 {
 516         struct omap_mcpdm *mcpdm;
 517         struct resource *res;
 518         int ret;
 519
 520         mcpdm = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcpdm), GFP_KERNEL);
 521         if (!mcpdm)
 522                 return -ENOMEM;
 523
 524         platform_set_drvdata(pdev, mcpdm);
 525
 526         mutex_init(&mcpdm->mutex);
 527
 528         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 529         if (res == NULL)
 530                 return -ENOMEM;
 531
 532         mcpdm->dma_data[0].addr = res->start + MCPDM_REG_DN_DATA;
 533         mcpdm->dma_data[1].addr = res->start + MCPDM_REG_UP_DATA;
 534
 535         mcpdm->dma_data[0].filter_data = "dn_link";
 536         mcpdm->dma_data[1].filter_data = "up_link";
 537
 538         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 539         mcpdm->io_base = devm_ioremap_resource(&pdev->dev, res);
 540         if (IS_ERR(mcpdm->io_base))
 541                 return PTR_ERR(mcpdm->io_base);
 542
 543         mcpdm->irq = platform_get_irq(pdev, 0);
 544         if (mcpdm->irq < 0)
 545                 return mcpdm->irq;
 546
 547         mcpdm->dev = &pdev->dev;
 548
 549         ret =  devm_snd_soc_register_component(&pdev->dev,
 550                                                &omap_mcpdm_component,
 551                                                &omap_mcpdm_dai, 1);
 552         if (ret)
 553                 return ret;
 554
 555         return sdma_pcm_platform_register(&pdev->dev, "dn_link", "up_link");
 556 }
 557
 558 static const struct of_device_id omap_mcpdm_of_match[] = {
 559         { .compatible = "ti,omap4-mcpdm", },
 560         { }
 561 };
 562 MODULE_DEVICE_TABLE(of, omap_mcpdm_of_match);
 563
 564 static struct platform_driver asoc_mcpdm_driver = {
 565         .driver = {
 566                 .name   = "omap-mcpdm",
 567                 .of_match_table = omap_mcpdm_of_match,
 568         },
 569
 570         .probe  = asoc_mcpdm_probe,
 571 };
 572
 573 module_platform_driver(asoc_mcpdm_driver);
 574
 575 MODULE_ALIAS("platform:omap-mcpdm");
 576 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
 577 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 578 MODULE_LICENSE("GPL");