sound/soc/fsl/mpc5200_dma.c

   1 /*
   2  * Freescale MPC5200 PSC DMA
   3  * ALSA SoC Platform driver
   4  *
   5  * Copyright (C) 2008 Secret Lab Technologies Ltd.
   6  * Copyright (C) 2009 Jon Smirl, Digispeaker
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/of_device.h>
  11
  12 #include <sound/soc.h>
  13
  14 #include <sysdev/bestcomm/bestcomm.h>
  15 #include <sysdev/bestcomm/gen_bd.h>
  16 #include <asm/mpc52xx_psc.h>
  17
  18 #include "mpc5200_dma.h"
  19
  20 /*
  21  * Interrupt handlers
  22  */
  23 static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
  24 {
  25         struct psc_dma *psc_dma = _psc_dma;
  26         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
  27         u16 isr;
  28
  29         isr = in_be16(&regs->mpc52xx_psc_isr);
  30
  31         /* Playback underrun error */
  32         if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
  33                 psc_dma->stats.underrun_count++;
  34
  35         /* Capture overrun error */
  36         if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
  37                 psc_dma->stats.overrun_count++;
  38
  39         out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
  40
  41         return IRQ_HANDLED;
  42 }
  43
  44 /**
  45  * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
  46  * @s: pointer to stream private data structure
  47  *
  48  * Enqueues another audio period buffer into the bestcomm queue.
  49  *
  50  * Note: The routine must only be called when there is space available in
  51  * the queue.  Otherwise the enqueue will fail and the audio ring buffer
  52  * will get out of sync
  53  */
  54 static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
  55 {
  56         struct bcom_bd *bd;
  57
  58         /* Prepare and enqueue the next buffer descriptor */
  59         bd = bcom_prepare_next_buffer(s->bcom_task);
  60         bd->status = s->period_bytes;
  61         bd->data[0] = s->period_next_pt;
  62         bcom_submit_next_buffer(s->bcom_task, NULL);
  63
  64         /* Update for next period */
  65         s->period_next_pt += s->period_bytes;
  66         if (s->period_next_pt >= s->period_end)
  67                 s->period_next_pt = s->period_start;
  68 }
  69
  70 static void psc_dma_bcom_enqueue_tx(struct psc_dma_stream *s)
  71 {
  72         if (s->appl_ptr > s->runtime->control->appl_ptr) {
  73                 /*
  74                  * In this case s->runtime->control->appl_ptr has wrapped around.
  75                  * Play the data to the end of the boundary, then wrap our own
  76                  * appl_ptr back around.
  77                  */
  78                 while (s->appl_ptr < s->runtime->boundary) {
  79                         if (bcom_queue_full(s->bcom_task))
  80                                 return;
  81
  82                         s->appl_ptr += s->period_size;
  83
  84                         psc_dma_bcom_enqueue_next_buffer(s);
  85                 }
  86                 s->appl_ptr -= s->runtime->boundary;
  87         }
  88
  89         while (s->appl_ptr < s->runtime->control->appl_ptr) {
  90
  91                 if (bcom_queue_full(s->bcom_task))
  92                         return;
  93
  94                 s->appl_ptr += s->period_size;
  95
  96                 psc_dma_bcom_enqueue_next_buffer(s);
  97         }
  98 }
  99
 100 /* Bestcomm DMA irq handler */
 101 static irqreturn_t psc_dma_bcom_irq_tx(int irq, void *_psc_dma_stream)
 102 {
 103         struct psc_dma_stream *s = _psc_dma_stream;
 104
 105         spin_lock(&s->psc_dma->lock);
 106         /* For each finished period, dequeue the completed period buffer
 107          * and enqueue a new one in it's place. */
 108         while (bcom_buffer_done(s->bcom_task)) {
 109                 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
 110
 111                 s->period_current_pt += s->period_bytes;
 112                 if (s->period_current_pt >= s->period_end)
 113                         s->period_current_pt = s->period_start;
 114         }
 115         psc_dma_bcom_enqueue_tx(s);
 116         spin_unlock(&s->psc_dma->lock);
 117
 118         /* If the stream is active, then also inform the PCM middle layer
 119          * of the period finished event. */
 120         if (s->active)
 121                 snd_pcm_period_elapsed(s->stream);
 122
 123         return IRQ_HANDLED;
 124 }
 125
 126 static irqreturn_t psc_dma_bcom_irq_rx(int irq, void *_psc_dma_stream)
 127 {
 128         struct psc_dma_stream *s = _psc_dma_stream;
 129
 130         spin_lock(&s->psc_dma->lock);
 131         /* For each finished period, dequeue the completed period buffer
 132          * and enqueue a new one in it's place. */
 133         while (bcom_buffer_done(s->bcom_task)) {
 134                 bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
 135
 136                 s->period_current_pt += s->period_bytes;
 137                 if (s->period_current_pt >= s->period_end)
 138                         s->period_current_pt = s->period_start;
 139
 140                 psc_dma_bcom_enqueue_next_buffer(s);
 141         }
 142         spin_unlock(&s->psc_dma->lock);
 143
 144         /* If the stream is active, then also inform the PCM middle layer
 145          * of the period finished event. */
 146         if (s->active)
 147                 snd_pcm_period_elapsed(s->stream);
 148
 149         return IRQ_HANDLED;
 150 }
 151
 152 static int psc_dma_hw_free(struct snd_pcm_substream *substream)
 153 {
 154         snd_pcm_set_runtime_buffer(substream, NULL);
 155         return 0;
 156 }
 157
 158 /**
 159  * psc_dma_trigger: start and stop the DMA transfer.
 160  *
 161  * This function is called by ALSA to start, stop, pause, and resume the DMA
 162  * transfer of data.
 163  */
 164 static int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd)
 165 {
 166         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 167         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
 168         struct snd_pcm_runtime *runtime = substream->runtime;
 169         struct psc_dma_stream *s;
 170         struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
 171         u16 imr;
 172         unsigned long flags;
 173         int i;
 174
 175         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 176                 s = &psc_dma->capture;
 177         else
 178                 s = &psc_dma->playback;
 179
 180         dev_dbg(psc_dma->dev, "psc_dma_trigger(substream=%p, cmd=%i)"
 181                 " stream_id=%i\n",
 182                 substream, cmd, substream->pstr->stream);
 183
 184         switch (cmd) {
 185         case SNDRV_PCM_TRIGGER_START:
 186                 s->period_bytes = frames_to_bytes(runtime,
 187                                                   runtime->period_size);
 188                 s->period_start = virt_to_phys(runtime->dma_area);
 189                 s->period_end = s->period_start +
 190                                 (s->period_bytes * runtime->periods);
 191                 s->period_next_pt = s->period_start;
 192                 s->period_current_pt = s->period_start;
 193                 s->period_size = runtime->period_size;
 194                 s->active = 1;
 195
 196                 /* track appl_ptr so that we have a better chance of detecting
 197                  * end of stream and not over running it.
 198                  */
 199                 s->runtime = runtime;
 200                 s->appl_ptr = s->runtime->control->appl_ptr -
 201                                 (runtime->period_size * runtime->periods);
 202
 203                 /* Fill up the bestcomm bd queue and enable DMA.
 204                  * This will begin filling the PSC's fifo.
 205                  */
 206                 spin_lock_irqsave(&psc_dma->lock, flags);
 207
 208                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
 209                         bcom_gen_bd_rx_reset(s->bcom_task);
 210                         for (i = 0; i < runtime->periods; i++)
 211                                 if (!bcom_queue_full(s->bcom_task))
 212                                         psc_dma_bcom_enqueue_next_buffer(s);
 213                 } else {
 214                         bcom_gen_bd_tx_reset(s->bcom_task);
 215                         psc_dma_bcom_enqueue_tx(s);
 216                 }
 217
 218                 bcom_enable(s->bcom_task);
 219                 spin_unlock_irqrestore(&psc_dma->lock, flags);
 220
 221                 out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
 222
 223                 break;
 224
 225         case SNDRV_PCM_TRIGGER_STOP:
 226                 s->active = 0;
 227
 228                 spin_lock_irqsave(&psc_dma->lock, flags);
 229                 bcom_disable(s->bcom_task);
 230                 if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 231                         bcom_gen_bd_rx_reset(s->bcom_task);
 232                 else
 233                         bcom_gen_bd_tx_reset(s->bcom_task);
 234                 spin_unlock_irqrestore(&psc_dma->lock, flags);
 235
 236                 break;
 237
 238         default:
 239                 dev_dbg(psc_dma->dev, "invalid command\n");
 240                 return -EINVAL;
 241         }
 242
 243         /* Update interrupt enable settings */
 244         imr = 0;
 245         if (psc_dma->playback.active)
 246                 imr |= MPC52xx_PSC_IMR_TXEMP;
 247         if (psc_dma->capture.active)
 248                 imr |= MPC52xx_PSC_IMR_ORERR;
 249         out_be16(&regs->isr_imr.imr, psc_dma->imr | imr);
 250
 251         return 0;
 252 }
 253
 254
 255 /* ---------------------------------------------------------------------
 256  * The PSC DMA 'ASoC platform' driver
 257  *
 258  * Can be referenced by an 'ASoC machine' driver
 259  * This driver only deals with the audio bus; it doesn't have any
 260  * interaction with the attached codec
 261  */
 262
 263 static const struct snd_pcm_hardware psc_dma_hardware = {
 264         .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
 265                 SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
 266                 SNDRV_PCM_INFO_BATCH,
 267         .formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
 268                 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
 269         .rate_min = 8000,
 270         .rate_max = 48000,
 271         .channels_min = 1,
 272         .channels_max = 2,
 273         .period_bytes_max       = 1024 * 1024,
 274         .period_bytes_min       = 32,
 275         .periods_min            = 2,
 276         .periods_max            = 256,
 277         .buffer_bytes_max       = 2 * 1024 * 1024,
 278         .fifo_size              = 512,
 279 };
 280
 281 static int psc_dma_open(struct snd_pcm_substream *substream)
 282 {
 283         struct snd_pcm_runtime *runtime = substream->runtime;
 284         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 285         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
 286         struct psc_dma_stream *s;
 287         int rc;
 288
 289         dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
 290
 291         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 292                 s = &psc_dma->capture;
 293         else
 294                 s = &psc_dma->playback;
 295
 296         snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
 297
 298         rc = snd_pcm_hw_constraint_integer(runtime,
 299                 SNDRV_PCM_HW_PARAM_PERIODS);
 300         if (rc < 0) {
 301                 dev_err(substream->pcm->card->dev, "invalid buffer size\n");
 302                 return rc;
 303         }
 304
 305         s->stream = substream;
 306         return 0;
 307 }
 308
 309 static int psc_dma_close(struct snd_pcm_substream *substream)
 310 {
 311         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 312         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
 313         struct psc_dma_stream *s;
 314
 315         dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
 316
 317         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 318                 s = &psc_dma->capture;
 319         else
 320                 s = &psc_dma->playback;
 321
 322         if (!psc_dma->playback.active &&
 323             !psc_dma->capture.active) {
 324
 325                 /* Disable all interrupts and reset the PSC */
 326                 out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 327                 out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
 328         }
 329         s->stream = NULL;
 330         return 0;
 331 }
 332
 333 static snd_pcm_uframes_t
 334 psc_dma_pointer(struct snd_pcm_substream *substream)
 335 {
 336         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 337         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
 338         struct psc_dma_stream *s;
 339         dma_addr_t count;
 340
 341         if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
 342                 s = &psc_dma->capture;
 343         else
 344                 s = &psc_dma->playback;
 345
 346         count = s->period_current_pt - s->period_start;
 347
 348         return bytes_to_frames(substream->runtime, count);
 349 }
 350
 351 static int
 352 psc_dma_hw_params(struct snd_pcm_substream *substream,
 353                          struct snd_pcm_hw_params *params)
 354 {
 355         snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 356
 357         return 0;
 358 }
 359
 360 static struct snd_pcm_ops psc_dma_ops = {
 361         .open           = psc_dma_open,
 362         .close          = psc_dma_close,
 363         .hw_free        = psc_dma_hw_free,
 364         .ioctl          = snd_pcm_lib_ioctl,
 365         .pointer        = psc_dma_pointer,
 366         .trigger        = psc_dma_trigger,
 367         .hw_params      = psc_dma_hw_params,
 368 };
 369
 370 static u64 psc_dma_dmamask = 0xffffffff;
 371 static int psc_dma_new(struct snd_card *card, struct snd_soc_dai *dai,
 372                            struct snd_pcm *pcm)
 373 {
 374         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
 375         struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
 376         size_t size = psc_dma_hardware.buffer_bytes_max;
 377         int rc = 0;
 378
 379         dev_dbg(rtd->socdev->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
 380                 card, dai, pcm);
 381
 382         if (!card->dev->dma_mask)
 383                 card->dev->dma_mask = &psc_dma_dmamask;
 384         if (!card->dev->coherent_dma_mask)
 385                 card->dev->coherent_dma_mask = 0xffffffff;
 386
 387         if (pcm->streams[0].substream) {
 388                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
 389                                 size, &pcm->streams[0].substream->dma_buffer);
 390                 if (rc)
 391                         goto playback_alloc_err;
 392         }
 393
 394         if (pcm->streams[1].substream) {
 395                 rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->card->dev,
 396                                 size, &pcm->streams[1].substream->dma_buffer);
 397                 if (rc)
 398                         goto capture_alloc_err;
 399         }
 400
 401         if (rtd->socdev->card->codec->ac97)
 402                 rtd->socdev->card->codec->ac97->private_data = psc_dma;
 403
 404         return 0;
 405
 406  capture_alloc_err:
 407         if (pcm->streams[0].substream)
 408                 snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
 409
 410  playback_alloc_err:
 411         dev_err(card->dev, "Cannot allocate buffer(s)\n");
 412
 413         return -ENOMEM;
 414 }
 415
 416 static void psc_dma_free(struct snd_pcm *pcm)
 417 {
 418         struct snd_soc_pcm_runtime *rtd = pcm->private_data;
 419         struct snd_pcm_substream *substream;
 420         int stream;
 421
 422         dev_dbg(rtd->socdev->dev, "psc_dma_free(pcm=%p)\n", pcm);
 423
 424         for (stream = 0; stream < 2; stream++) {
 425                 substream = pcm->streams[stream].substream;
 426                 if (substream) {
 427                         snd_dma_free_pages(&substream->dma_buffer);
 428                         substream->dma_buffer.area = NULL;
 429                         substream->dma_buffer.addr = 0;
 430                 }
 431         }
 432 }
 433
 434 struct snd_soc_platform mpc5200_audio_dma_platform = {
 435         .name           = "mpc5200-psc-audio",
 436         .pcm_ops        = &psc_dma_ops,
 437         .pcm_new        = &psc_dma_new,
 438         .pcm_free       = &psc_dma_free,
 439 };
 440 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_platform);
 441
 442 int mpc5200_audio_dma_create(struct of_device *op)
 443 {
 444         phys_addr_t fifo;
 445         struct psc_dma *psc_dma;
 446         struct resource res;
 447         int size, irq, rc;
 448         const __be32 *prop;
 449         void __iomem *regs;
 450
 451         /* Fetch the registers and IRQ of the PSC */
 452         irq = irq_of_parse_and_map(op->node, 0);
 453         if (of_address_to_resource(op->node, 0, &res)) {
 454                 dev_err(&op->dev, "Missing reg property\n");
 455                 return -ENODEV;
 456         }
 457         regs = ioremap(res.start, 1 + res.end - res.start);
 458         if (!regs) {
 459                 dev_err(&op->dev, "Could not map registers\n");
 460                 return -ENODEV;
 461         }
 462
 463         /* Allocate and initialize the driver private data */
 464         psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
 465         if (!psc_dma) {
 466                 iounmap(regs);
 467                 return -ENOMEM;
 468         }
 469
 470         /* Get the PSC ID */
 471         prop = of_get_property(op->node, "cell-index", &size);
 472         if (!prop || size < sizeof *prop)
 473                 return -ENODEV;
 474
 475         spin_lock_init(&psc_dma->lock);
 476         mutex_init(&psc_dma->mutex);
 477         psc_dma->id = be32_to_cpu(*prop);
 478         psc_dma->irq = irq;
 479         psc_dma->psc_regs = regs;
 480         psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
 481         psc_dma->dev = &op->dev;
 482         psc_dma->playback.psc_dma = psc_dma;
 483         psc_dma->capture.psc_dma = psc_dma;
 484         snprintf(psc_dma->name, sizeof psc_dma->name, "PSC%u", psc_dma->id);
 485
 486         /* Find the address of the fifo data registers and setup the
 487          * DMA tasks */
 488         fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
 489         psc_dma->capture.bcom_task =
 490                 bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
 491         psc_dma->playback.bcom_task =
 492                 bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
 493         if (!psc_dma->capture.bcom_task ||
 494             !psc_dma->playback.bcom_task) {
 495                 dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
 496                 iounmap(regs);
 497                 kfree(psc_dma);
 498                 return -ENODEV;
 499         }
 500
 501         /* Disable all interrupts and reset the PSC */
 502         out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
 503          /* reset receiver */
 504         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
 505          /* reset transmitter */
 506         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
 507          /* reset error */
 508         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
 509          /* reset mode */
 510         out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
 511
 512         /* Set up mode register;
 513          * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
 514          * Second write: register Normal mode for non loopback
 515          */
 516         out_8(&psc_dma->psc_regs->mode, 0);
 517         out_8(&psc_dma->psc_regs->mode, 0);
 518
 519         /* Set the TX and RX fifo alarm thresholds */
 520         out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
 521         out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
 522         out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
 523         out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
 524
 525         /* Lookup the IRQ numbers */
 526         psc_dma->playback.irq =
 527                 bcom_get_task_irq(psc_dma->playback.bcom_task);
 528         psc_dma->capture.irq =
 529                 bcom_get_task_irq(psc_dma->capture.bcom_task);
 530
 531         rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
 532                          "psc-dma-status", psc_dma);
 533         rc |= request_irq(psc_dma->capture.irq,
 534                           &psc_dma_bcom_irq_rx, IRQF_SHARED,
 535                           "psc-dma-capture", &psc_dma->capture);
 536         rc |= request_irq(psc_dma->playback.irq,
 537                           &psc_dma_bcom_irq_tx, IRQF_SHARED,
 538                           "psc-dma-playback", &psc_dma->playback);
 539         if (rc) {
 540                 free_irq(psc_dma->irq, psc_dma);
 541                 free_irq(psc_dma->capture.irq,
 542                          &psc_dma->capture);
 543                 free_irq(psc_dma->playback.irq,
 544                          &psc_dma->playback);
 545                 return -ENODEV;
 546         }
 547
 548         /* Save what we've done so it can be found again later */
 549         dev_set_drvdata(&op->dev, psc_dma);
 550
 551         /* Tell the ASoC OF helpers about it */
 552         return snd_soc_register_platform(&mpc5200_audio_dma_platform);
 553 }
 554 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
 555
 556 int mpc5200_audio_dma_destroy(struct of_device *op)
 557 {
 558         struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
 559
 560         dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
 561
 562         snd_soc_unregister_platform(&mpc5200_audio_dma_platform);
 563
 564         bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
 565         bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
 566
 567         /* Release irqs */
 568         free_irq(psc_dma->irq, psc_dma);
 569         free_irq(psc_dma->capture.irq, &psc_dma->capture);
 570         free_irq(psc_dma->playback.irq, &psc_dma->playback);
 571
 572         iounmap(psc_dma->psc_regs);
 573         kfree(psc_dma);
 574         dev_set_drvdata(&op->dev, NULL);
 575
 576         return 0;
 577 }
 578 EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
 579
 580 MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
 581 MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
 582 MODULE_LICENSE("GPL");