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         struct pm_qos_request pm_qos_req;
  58         int latency[2];
  59
  60         struct mutex mutex;
  61
  62         /* Playback/Capture configuration */
  63         struct mcpdm_link_config config[2];
  64
  65         /* McPDM dn offsets for rx1, and 2 channels */
  66         u32 dn_rx_offset;
  67
  68         /* McPDM needs to be restarted due to runtime reconfiguration */
  69         bool restart;
  70
  71         /* pm state for suspend/resume handling */
  72         int pm_active_count;
  73
  74         struct snd_dmaengine_dai_dma_data dma_data[2];
  75 };
  76
  77 /*
  78  * Stream DMA parameters
  79  */
  80
  81 static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val)
  82 {
  83         writel_relaxed(val, mcpdm->io_base + reg);
  84 }
  85
  86 static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg)
  87 {
  88         return readl_relaxed(mcpdm->io_base + reg);
  89 }
  90
  91 #ifdef DEBUG
  92 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm)
  93 {
  94         dev_dbg(mcpdm->dev, "***********************\n");
  95         dev_dbg(mcpdm->dev, "IRQSTATUS_RAW:  0x%04x\n",
  96                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS_RAW));
  97         dev_dbg(mcpdm->dev, "IRQSTATUS:  0x%04x\n",
  98                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS));
  99         dev_dbg(mcpdm->dev, "IRQENABLE_SET:  0x%04x\n",
 100                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_SET));
 101         dev_dbg(mcpdm->dev, "IRQENABLE_CLR:  0x%04x\n",
 102                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_CLR));
 103         dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
 104                         omap_mcpdm_read(mcpdm, MCPDM_REG_IRQWAKE_EN));
 105         dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
 106                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_SET));
 107         dev_dbg(mcpdm->dev, "DMAENABLE_CLR:  0x%04x\n",
 108                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_CLR));
 109         dev_dbg(mcpdm->dev, "DMAWAKEEN:  0x%04x\n",
 110                         omap_mcpdm_read(mcpdm, MCPDM_REG_DMAWAKEEN));
 111         dev_dbg(mcpdm->dev, "CTRL:  0x%04x\n",
 112                         omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL));
 113         dev_dbg(mcpdm->dev, "DN_DATA:  0x%04x\n",
 114                         omap_mcpdm_read(mcpdm, MCPDM_REG_DN_DATA));
 115         dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
 116                         omap_mcpdm_read(mcpdm, MCPDM_REG_UP_DATA));
 117         dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
 118                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_DN));
 119         dev_dbg(mcpdm->dev, "FIFO_CTRL_UP:  0x%04x\n",
 120                         omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_UP));
 121         dev_dbg(mcpdm->dev, "***********************\n");
 122 }
 123 #else
 124 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) {}
 125 #endif
 126
 127 /*
 128  * Enables the transfer through the PDM interface to/from the Phoenix
 129  * codec by enabling the corresponding UP or DN channels.
 130  */
 131 static void omap_mcpdm_start(struct omap_mcpdm *mcpdm)
 132 {
 133         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 134         u32 link_mask = mcpdm->config[0].link_mask | mcpdm->config[1].link_mask;
 135
 136         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 137         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 138
 139         ctrl |= link_mask;
 140         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 141
 142         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 143         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 144 }
 145
 146 /*
 147  * Disables the transfer through the PDM interface to/from the Phoenix
 148  * codec by disabling the corresponding UP or DN channels.
 149  */
 150 static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm)
 151 {
 152         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 153         u32 link_mask = MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK;
 154
 155         ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 156         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 157
 158         ctrl &= ~(link_mask);
 159         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 160
 161         ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
 162         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
 163
 164 }
 165
 166 /*
 167  * Is the physical McPDM interface active.
 168  */
 169 static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm)
 170 {
 171         return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) &
 172                                         (MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK);
 173 }
 174
 175 /*
 176  * Configures McPDM uplink, and downlink for audio.
 177  * This function should be called before omap_mcpdm_start.
 178  */
 179 static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm)
 180 {
 181         u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
 182
 183         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
 184
 185         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET,
 186                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
 187                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 188
 189         /* Enable DN RX1/2 offset cancellation feature, if configured */
 190         if (mcpdm->dn_rx_offset) {
 191                 u32 dn_offset = mcpdm->dn_rx_offset;
 192
 193                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 194                 dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
 195                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
 196         }
 197
 198         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN,
 199                          mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold);
 200         omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP,
 201                          mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold);
 202
 203         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET,
 204                         MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE);
 205 }
 206
 207 /*
 208  * Cleans McPDM uplink, and downlink configuration.
 209  * This function should be called when the stream is closed.
 210  */
 211 static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
 212 {
 213         /* Disable irq request generation for downlink */
 214         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 215                         MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL);
 216
 217         /* Disable DMA request generation for downlink */
 218         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE);
 219
 220         /* Disable irq request generation for uplink */
 221         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
 222                         MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
 223
 224         /* Disable DMA request generation for uplink */
 225         omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
 226
 227         /* Disable RX1/2 offset cancellation */
 228         if (mcpdm->dn_rx_offset)
 229                 omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
 230 }
 231
 232 static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
 233 {
 234         struct omap_mcpdm *mcpdm = dev_id;
 235         int irq_status;
 236
 237         irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS);
 238
 239         /* Acknowledge irq event */
 240         omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status);
 241
 242         if (irq_status & MCPDM_DN_IRQ_FULL)
 243                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n");
 244
 245         if (irq_status & MCPDM_DN_IRQ_EMPTY)
 246                 dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n");
 247
 248         if (irq_status & MCPDM_DN_IRQ)
 249                 dev_dbg(mcpdm->dev, "DN (playback) write request\n");
 250
 251         if (irq_status & MCPDM_UP_IRQ_FULL)
 252                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n");
 253
 254         if (irq_status & MCPDM_UP_IRQ_EMPTY)
 255                 dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n");
 256
 257         if (irq_status & MCPDM_UP_IRQ)
 258                 dev_dbg(mcpdm->dev, "UP (capture) write request\n");
 259
 260         return IRQ_HANDLED;
 261 }
 262
 263 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
 264                                   struct snd_soc_dai *dai)
 265 {
 266         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 267
 268         mutex_lock(&mcpdm->mutex);
 269
 270         if (!dai->active)
 271                 omap_mcpdm_open_streams(mcpdm);
 272
 273         mutex_unlock(&mcpdm->mutex);
 274
 275         return 0;
 276 }
 277
 278 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
 279                                   struct snd_soc_dai *dai)
 280 {
 281         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 282         int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
 283         int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
 284         int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 285
 286         mutex_lock(&mcpdm->mutex);
 287
 288         if (!dai->active) {
 289                 if (omap_mcpdm_active(mcpdm)) {
 290                         omap_mcpdm_stop(mcpdm);
 291                         omap_mcpdm_close_streams(mcpdm);
 292                         mcpdm->config[0].link_mask = 0;
 293                         mcpdm->config[1].link_mask = 0;
 294                 }
 295         }
 296
 297         if (mcpdm->latency[stream2])
 298                 pm_qos_update_request(&mcpdm->pm_qos_req,
 299                                       mcpdm->latency[stream2]);
 300         else if (mcpdm->latency[stream1])
 301                 pm_qos_remove_request(&mcpdm->pm_qos_req);
 302
 303         mcpdm->latency[stream1] = 0;
 304
 305         mutex_unlock(&mcpdm->mutex);
 306 }
 307
 308 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
 309                                     struct snd_pcm_hw_params *params,
 310                                     struct snd_soc_dai *dai)
 311 {
 312         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 313         int stream = substream->stream;
 314         struct snd_dmaengine_dai_dma_data *dma_data;
 315         u32 threshold;
 316         int channels, latency;
 317         int link_mask = 0;
 318
 319         channels = params_channels(params);
 320         switch (channels) {
 321         case 5:
 322                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 323                         /* up to 3 channels for capture */
 324                         return -EINVAL;
 325                 link_mask |= 1 << 4;
 326                 /* fall through */
 327         case 4:
 328                 if (stream == SNDRV_PCM_STREAM_CAPTURE)
 329                         /* up to 3 channels for capture */
 330                         return -EINVAL;
 331                 link_mask |= 1 << 3;
 332                 /* fall through */
 333         case 3:
 334                 link_mask |= 1 << 2;
 335                 /* fall through */
 336         case 2:
 337                 link_mask |= 1 << 1;
 338                 /* fall through */
 339         case 1:
 340                 link_mask |= 1 << 0;
 341                 break;
 342         default:
 343                 /* unsupported number of channels */
 344                 return -EINVAL;
 345         }
 346
 347         dma_data = snd_soc_dai_get_dma_data(dai, substream);
 348
 349         threshold = mcpdm->config[stream].threshold;
 350         /* Configure McPDM channels, and DMA packet size */
 351         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 352                 link_mask <<= 3;
 353
 354                 /* If capture is not running assume a stereo stream to come */
 355                 if (!mcpdm->config[!stream].link_mask)
 356                         mcpdm->config[!stream].link_mask = 0x3;
 357
 358                 dma_data->maxburst =
 359                                 (MCPDM_DN_THRES_MAX - threshold) * channels;
 360                 latency = threshold;
 361         } else {
 362                 /* If playback is not running assume a stereo stream to come */
 363                 if (!mcpdm->config[!stream].link_mask)
 364                         mcpdm->config[!stream].link_mask = (0x3 << 3);
 365
 366                 dma_data->maxburst = threshold * channels;
 367                 latency = (MCPDM_DN_THRES_MAX - threshold);
 368         }
 369
 370         /*
 371          * The DMA must act to a DMA request within latency time (usec) to avoid
 372          * under/overflow
 373          */
 374         mcpdm->latency[stream] = latency * USEC_PER_SEC / params_rate(params);
 375
 376         if (!mcpdm->latency[stream])
 377                 mcpdm->latency[stream] = 10;
 378
 379         /* Check if we need to restart McPDM with this stream */
 380         if (mcpdm->config[stream].link_mask &&
 381             mcpdm->config[stream].link_mask != link_mask)
 382                 mcpdm->restart = true;
 383
 384         mcpdm->config[stream].link_mask = link_mask;
 385
 386         return 0;
 387 }
 388
 389 static int omap_mcpdm_prepare(struct snd_pcm_substream *substream,
 390                                   struct snd_soc_dai *dai)
 391 {
 392         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 393         struct pm_qos_request *pm_qos_req = &mcpdm->pm_qos_req;
 394         int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
 395         int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
 396         int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 397         int latency = mcpdm->latency[stream2];
 398
 399         /* Prevent omap hardware from hitting off between FIFO fills */
 400         if (!latency || mcpdm->latency[stream1] < latency)
 401                 latency = mcpdm->latency[stream1];
 402
 403         if (pm_qos_request_active(pm_qos_req))
 404                 pm_qos_update_request(pm_qos_req, latency);
 405         else if (latency)
 406                 pm_qos_add_request(pm_qos_req, PM_QOS_CPU_DMA_LATENCY, latency);
 407
 408         if (!omap_mcpdm_active(mcpdm)) {
 409                 omap_mcpdm_start(mcpdm);
 410                 omap_mcpdm_reg_dump(mcpdm);
 411         } else if (mcpdm->restart) {
 412                 omap_mcpdm_stop(mcpdm);
 413                 omap_mcpdm_start(mcpdm);
 414                 mcpdm->restart = false;
 415                 omap_mcpdm_reg_dump(mcpdm);
 416         }
 417
 418         return 0;
 419 }
 420
 421 static const struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
 422         .startup        = omap_mcpdm_dai_startup,
 423         .shutdown       = omap_mcpdm_dai_shutdown,
 424         .hw_params      = omap_mcpdm_dai_hw_params,
 425         .prepare        = omap_mcpdm_prepare,
 426 };
 427
 428 static int omap_mcpdm_probe(struct snd_soc_dai *dai)
 429 {
 430         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 431         int ret;
 432
 433         pm_runtime_enable(mcpdm->dev);
 434
 435         /* Disable lines while request is ongoing */
 436         pm_runtime_get_sync(mcpdm->dev);
 437         omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00);
 438
 439         ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler, 0, "McPDM",
 440                           (void *)mcpdm);
 441
 442         pm_runtime_put_sync(mcpdm->dev);
 443
 444         if (ret) {
 445                 dev_err(mcpdm->dev, "Request for IRQ failed\n");
 446                 pm_runtime_disable(mcpdm->dev);
 447         }
 448
 449         /* Configure McPDM threshold values */
 450         mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold = 2;
 451         mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold =
 452                                                         MCPDM_UP_THRES_MAX - 3;
 453
 454         snd_soc_dai_init_dma_data(dai,
 455                                   &mcpdm->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
 456                                   &mcpdm->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
 457
 458         return ret;
 459 }
 460
 461 static int omap_mcpdm_remove(struct snd_soc_dai *dai)
 462 {
 463         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 464
 465         free_irq(mcpdm->irq, (void *)mcpdm);
 466         pm_runtime_disable(mcpdm->dev);
 467
 468         if (pm_qos_request_active(&mcpdm->pm_qos_req))
 469                 pm_qos_remove_request(&mcpdm->pm_qos_req);
 470
 471         return 0;
 472 }
 473
 474 #ifdef CONFIG_PM_SLEEP
 475 static int omap_mcpdm_suspend(struct snd_soc_dai *dai)
 476 {
 477         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 478
 479         if (dai->active) {
 480                 omap_mcpdm_stop(mcpdm);
 481                 omap_mcpdm_close_streams(mcpdm);
 482         }
 483
 484         mcpdm->pm_active_count = 0;
 485         while (pm_runtime_active(mcpdm->dev)) {
 486                 pm_runtime_put_sync(mcpdm->dev);
 487                 mcpdm->pm_active_count++;
 488         }
 489
 490         return 0;
 491 }
 492
 493 static int omap_mcpdm_resume(struct snd_soc_dai *dai)
 494 {
 495         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
 496
 497         if (mcpdm->pm_active_count) {
 498                 while (mcpdm->pm_active_count--)
 499                         pm_runtime_get_sync(mcpdm->dev);
 500
 501                 if (dai->active) {
 502                         omap_mcpdm_open_streams(mcpdm);
 503                         omap_mcpdm_start(mcpdm);
 504                 }
 505         }
 506
 507
 508         return 0;
 509 }
 510 #else
 511 #define omap_mcpdm_suspend NULL
 512 #define omap_mcpdm_resume NULL
 513 #endif
 514
 515 #define OMAP_MCPDM_RATES        (SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
 516 #define OMAP_MCPDM_FORMATS      SNDRV_PCM_FMTBIT_S32_LE
 517
 518 static struct snd_soc_dai_driver omap_mcpdm_dai = {
 519         .probe = omap_mcpdm_probe,
 520         .remove = omap_mcpdm_remove,
 521         .suspend = omap_mcpdm_suspend,
 522         .resume = omap_mcpdm_resume,
 523         .probe_order = SND_SOC_COMP_ORDER_LATE,
 524         .remove_order = SND_SOC_COMP_ORDER_EARLY,
 525         .playback = {
 526                 .channels_min = 1,
 527                 .channels_max = 5,
 528                 .rates = OMAP_MCPDM_RATES,
 529                 .formats = OMAP_MCPDM_FORMATS,
 530                 .sig_bits = 24,
 531         },
 532         .capture = {
 533                 .channels_min = 1,
 534                 .channels_max = 3,
 535                 .rates = OMAP_MCPDM_RATES,
 536                 .formats = OMAP_MCPDM_FORMATS,
 537                 .sig_bits = 24,
 538         },
 539         .ops = &omap_mcpdm_dai_ops,
 540 };
 541
 542 static const struct snd_soc_component_driver omap_mcpdm_component = {
 543         .name           = "omap-mcpdm",
 544 };
 545
 546 void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
 547                                     u8 rx1, u8 rx2)
 548 {
 549         struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 550
 551         mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2);
 552 }
 553 EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets);
 554
 555 static int asoc_mcpdm_probe(struct platform_device *pdev)
 556 {
 557         struct omap_mcpdm *mcpdm;
 558         struct resource *res;
 559         int ret;
 560
 561         mcpdm = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcpdm), GFP_KERNEL);
 562         if (!mcpdm)
 563                 return -ENOMEM;
 564
 565         platform_set_drvdata(pdev, mcpdm);
 566
 567         mutex_init(&mcpdm->mutex);
 568
 569         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 570         if (res == NULL)
 571                 return -ENOMEM;
 572
 573         mcpdm->dma_data[0].addr = res->start + MCPDM_REG_DN_DATA;
 574         mcpdm->dma_data[1].addr = res->start + MCPDM_REG_UP_DATA;
 575
 576         mcpdm->dma_data[0].filter_data = "dn_link";
 577         mcpdm->dma_data[1].filter_data = "up_link";
 578
 579         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 580         mcpdm->io_base = devm_ioremap_resource(&pdev->dev, res);
 581         if (IS_ERR(mcpdm->io_base))
 582                 return PTR_ERR(mcpdm->io_base);
 583
 584         mcpdm->irq = platform_get_irq(pdev, 0);
 585         if (mcpdm->irq < 0)
 586                 return mcpdm->irq;
 587
 588         mcpdm->dev = &pdev->dev;
 589
 590         ret =  devm_snd_soc_register_component(&pdev->dev,
 591                                                &omap_mcpdm_component,
 592                                                &omap_mcpdm_dai, 1);
 593         if (ret)
 594                 return ret;
 595
 596         return sdma_pcm_platform_register(&pdev->dev, "dn_link", "up_link");
 597 }
 598
 599 static const struct of_device_id omap_mcpdm_of_match[] = {
 600         { .compatible = "ti,omap4-mcpdm", },
 601         { }
 602 };
 603 MODULE_DEVICE_TABLE(of, omap_mcpdm_of_match);
 604
 605 static struct platform_driver asoc_mcpdm_driver = {
 606         .driver = {
 607                 .name   = "omap-mcpdm",
 608                 .of_match_table = omap_mcpdm_of_match,
 609         },
 610
 611         .probe  = asoc_mcpdm_probe,
 612 };
 613
 614 module_platform_driver(asoc_mcpdm_driver);
 615
 616 MODULE_ALIAS("platform:omap-mcpdm");
 617 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
 618 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
 619 MODULE_LICENSE("GPL");