sound/soc/sh/siu_pcm.c

   1 /*
   2  * siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
   3  *
   4  * Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   5  * Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21 #include <linux/delay.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/dmaengine.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <sound/control.h>
  29 #include <sound/core.h>
  30 #include <sound/pcm.h>
  31 #include <sound/pcm_params.h>
  32 #include <sound/soc-dai.h>
  33
  34 #include <asm/siu.h>
  35
  36 #include "siu.h"
  37
  38 #define GET_MAX_PERIODS(buf_bytes, period_bytes) \
  39                                 ((buf_bytes) / (period_bytes))
  40 #define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
  41                                 ((buf_addr) + ((period_num) * (period_bytes)))
  42
  43 #define RWF_STM_RD              0x01            /* Read in progress */
  44 #define RWF_STM_WT              0x02            /* Write in progress */
  45
  46 struct siu_port *siu_ports[SIU_PORT_NUM];
  47
  48 /* transfersize is number of u32 dma transfers per period */
  49 static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
  50 {
  51         struct siu_info *info = siu_i2s_data;
  52         u32 __iomem *base = info->reg;
  53         struct siu_stream *siu_stream = &port_info->playback;
  54         u32 stfifo;
  55
  56         if (!siu_stream->rw_flg)
  57                 return -EPERM;
  58
  59         /* output FIFO disable */
  60         stfifo = siu_read32(base + SIU_STFIFO);
  61         siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
  62         pr_debug("%s: STFIFO %x -> %x\n", __func__,
  63                  stfifo, stfifo & ~0x0c180c18);
  64
  65         /* during stmwrite clear */
  66         siu_stream->rw_flg = 0;
  67
  68         return 0;
  69 }
  70
  71 static int siu_pcm_stmwrite_start(struct siu_port *port_info)
  72 {
  73         struct siu_stream *siu_stream = &port_info->playback;
  74
  75         if (siu_stream->rw_flg)
  76                 return -EPERM;
  77
  78         /* Current period in buffer */
  79         port_info->playback.cur_period = 0;
  80
  81         /* during stmwrite flag set */
  82         siu_stream->rw_flg = RWF_STM_WT;
  83
  84         /* DMA transfer start */
  85         tasklet_schedule(&siu_stream->tasklet);
  86
  87         return 0;
  88 }
  89
  90 static void siu_dma_tx_complete(void *arg)
  91 {
  92         struct siu_stream *siu_stream = arg;
  93
  94         if (!siu_stream->rw_flg)
  95                 return;
  96
  97         /* Update completed period count */
  98         if (++siu_stream->cur_period >=
  99             GET_MAX_PERIODS(siu_stream->buf_bytes,
 100                             siu_stream->period_bytes))
 101                 siu_stream->cur_period = 0;
 102
 103         pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
 104                 __func__, siu_stream->cur_period,
 105                 siu_stream->cur_period * siu_stream->period_bytes,
 106                 siu_stream->buf_bytes, siu_stream->cookie);
 107
 108         tasklet_schedule(&siu_stream->tasklet);
 109
 110         /* Notify alsa: a period is done */
 111         snd_pcm_period_elapsed(siu_stream->substream);
 112 }
 113
 114 static int siu_pcm_wr_set(struct siu_port *port_info,
 115                           dma_addr_t buff, u32 size)
 116 {
 117         struct siu_info *info = siu_i2s_data;
 118         u32 __iomem *base = info->reg;
 119         struct siu_stream *siu_stream = &port_info->playback;
 120         struct snd_pcm_substream *substream = siu_stream->substream;
 121         struct device *dev = substream->pcm->card->dev;
 122         struct dma_async_tx_descriptor *desc;
 123         dma_cookie_t cookie;
 124         struct scatterlist sg;
 125         u32 stfifo;
 126
 127         sg_init_table(&sg, 1);
 128         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
 129                     size, offset_in_page(buff));
 130         sg_dma_address(&sg) = buff;
 131
 132         desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
 133                 &sg, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 134         if (!desc) {
 135                 dev_err(dev, "Failed to allocate a dma descriptor\n");
 136                 return -ENOMEM;
 137         }
 138
 139         desc->callback = siu_dma_tx_complete;
 140         desc->callback_param = siu_stream;
 141         cookie = desc->tx_submit(desc);
 142         if (cookie < 0) {
 143                 dev_err(dev, "Failed to submit a dma transfer\n");
 144                 return cookie;
 145         }
 146
 147         siu_stream->tx_desc = desc;
 148         siu_stream->cookie = cookie;
 149
 150         dma_async_issue_pending(siu_stream->chan);
 151
 152         /* only output FIFO enable */
 153         stfifo = siu_read32(base + SIU_STFIFO);
 154         siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18));
 155         dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
 156                 stfifo, stfifo | (port_info->stfifo & 0x0c180c18));
 157
 158         return 0;
 159 }
 160
 161 static int siu_pcm_rd_set(struct siu_port *port_info,
 162                           dma_addr_t buff, size_t size)
 163 {
 164         struct siu_info *info = siu_i2s_data;
 165         u32 __iomem *base = info->reg;
 166         struct siu_stream *siu_stream = &port_info->capture;
 167         struct snd_pcm_substream *substream = siu_stream->substream;
 168         struct device *dev = substream->pcm->card->dev;
 169         struct dma_async_tx_descriptor *desc;
 170         dma_cookie_t cookie;
 171         struct scatterlist sg;
 172         u32 stfifo;
 173
 174         dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
 175
 176         sg_init_table(&sg, 1);
 177         sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
 178                     size, offset_in_page(buff));
 179         sg_dma_address(&sg) = buff;
 180
 181         desc = siu_stream->chan->device->device_prep_slave_sg(siu_stream->chan,
 182                 &sg, 1, DMA_FROM_DEVICE, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 183         if (!desc) {
 184                 dev_err(dev, "Failed to allocate dma descriptor\n");
 185                 return -ENOMEM;
 186         }
 187
 188         desc->callback = siu_dma_tx_complete;
 189         desc->callback_param = siu_stream;
 190         cookie = desc->tx_submit(desc);
 191         if (cookie < 0) {
 192                 dev_err(dev, "Failed to submit dma descriptor\n");
 193                 return cookie;
 194         }
 195
 196         siu_stream->tx_desc = desc;
 197         siu_stream->cookie = cookie;
 198
 199         dma_async_issue_pending(siu_stream->chan);
 200
 201         /* only input FIFO enable */
 202         stfifo = siu_read32(base + SIU_STFIFO);
 203         siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
 204                     (port_info->stfifo & 0x13071307));
 205         dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
 206                 stfifo, stfifo | (port_info->stfifo & 0x13071307));
 207
 208         return 0;
 209 }
 210
 211 static void siu_io_tasklet(unsigned long data)
 212 {
 213         struct siu_stream *siu_stream = (struct siu_stream *)data;
 214         struct snd_pcm_substream *substream = siu_stream->substream;
 215         struct device *dev = substream->pcm->card->dev;
 216         struct snd_pcm_runtime *rt = substream->runtime;
 217         struct siu_port *port_info = siu_port_info(substream);
 218
 219         dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
 220
 221         if (!siu_stream->rw_flg) {
 222                 dev_dbg(dev, "%s: stream inactive\n", __func__);
 223                 return;
 224         }
 225
 226         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 227                 dma_addr_t buff;
 228                 size_t count;
 229                 u8 *virt;
 230
 231                 buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
 232                                                 siu_stream->cur_period,
 233                                                 siu_stream->period_bytes);
 234                 virt = PERIOD_OFFSET(rt->dma_area,
 235                                      siu_stream->cur_period,
 236                                      siu_stream->period_bytes);
 237                 count = siu_stream->period_bytes;
 238
 239                 /* DMA transfer start */
 240                 siu_pcm_rd_set(port_info, buff, count);
 241         } else {
 242                 siu_pcm_wr_set(port_info,
 243                                (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
 244                                                 siu_stream->cur_period,
 245                                                 siu_stream->period_bytes),
 246                                siu_stream->period_bytes);
 247         }
 248 }
 249
 250 /* Capture */
 251 static int siu_pcm_stmread_start(struct siu_port *port_info)
 252 {
 253         struct siu_stream *siu_stream = &port_info->capture;
 254
 255         if (siu_stream->xfer_cnt > 0x1000000)
 256                 return -EINVAL;
 257         if (siu_stream->rw_flg)
 258                 return -EPERM;
 259
 260         /* Current period in buffer */
 261         siu_stream->cur_period = 0;
 262
 263         /* during stmread flag set */
 264         siu_stream->rw_flg = RWF_STM_RD;
 265
 266         tasklet_schedule(&siu_stream->tasklet);
 267
 268         return 0;
 269 }
 270
 271 static int siu_pcm_stmread_stop(struct siu_port *port_info)
 272 {
 273         struct siu_info *info = siu_i2s_data;
 274         u32 __iomem *base = info->reg;
 275         struct siu_stream *siu_stream = &port_info->capture;
 276         struct device *dev = siu_stream->substream->pcm->card->dev;
 277         u32 stfifo;
 278
 279         if (!siu_stream->rw_flg)
 280                 return -EPERM;
 281
 282         /* input FIFO disable */
 283         stfifo = siu_read32(base + SIU_STFIFO);
 284         siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
 285         dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
 286                 stfifo, stfifo & ~0x13071307);
 287
 288         /* during stmread flag clear */
 289         siu_stream->rw_flg = 0;
 290
 291         return 0;
 292 }
 293
 294 static int siu_pcm_hw_params(struct snd_pcm_substream *ss,
 295                              struct snd_pcm_hw_params *hw_params)
 296 {
 297         struct siu_info *info = siu_i2s_data;
 298         struct device *dev = ss->pcm->card->dev;
 299         int ret;
 300
 301         dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
 302
 303         ret = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw_params));
 304         if (ret < 0)
 305                 dev_err(dev, "snd_pcm_lib_malloc_pages() failed\n");
 306
 307         return ret;
 308 }
 309
 310 static int siu_pcm_hw_free(struct snd_pcm_substream *ss)
 311 {
 312         struct siu_info *info = siu_i2s_data;
 313         struct siu_port *port_info = siu_port_info(ss);
 314         struct device *dev = ss->pcm->card->dev;
 315         struct siu_stream *siu_stream;
 316
 317         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 318                 siu_stream = &port_info->playback;
 319         else
 320                 siu_stream = &port_info->capture;
 321
 322         dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
 323
 324         return snd_pcm_lib_free_pages(ss);
 325 }
 326
 327 static bool filter(struct dma_chan *chan, void *slave)
 328 {
 329         struct sh_dmae_slave *param = slave;
 330
 331         pr_debug("%s: slave ID %d\n", __func__, param->slave_id);
 332
 333         if (unlikely(param->dma_dev != chan->device->dev))
 334                 return false;
 335
 336         chan->private = param;
 337         return true;
 338 }
 339
 340 static int siu_pcm_open(struct snd_pcm_substream *ss)
 341 {
 342         /* Playback / Capture */
 343         struct snd_soc_pcm_runtime *rtd = ss->private_data;
 344         struct siu_platform *pdata = snd_soc_platform_get_drvdata(rtd->platform);
 345         struct siu_info *info = siu_i2s_data;
 346         struct siu_port *port_info = siu_port_info(ss);
 347         struct siu_stream *siu_stream;
 348         u32 port = info->port_id;
 349         struct device *dev = ss->pcm->card->dev;
 350         dma_cap_mask_t mask;
 351         struct sh_dmae_slave *param;
 352
 353         dma_cap_zero(mask);
 354         dma_cap_set(DMA_SLAVE, mask);
 355
 356         dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
 357
 358         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 359                 siu_stream = &port_info->playback;
 360                 param = &siu_stream->param;
 361                 param->slave_id = port ? pdata->dma_slave_tx_b :
 362                         pdata->dma_slave_tx_a;
 363         } else {
 364                 siu_stream = &port_info->capture;
 365                 param = &siu_stream->param;
 366                 param->slave_id = port ? pdata->dma_slave_rx_b :
 367                         pdata->dma_slave_rx_a;
 368         }
 369
 370         param->dma_dev = pdata->dma_dev;
 371         /* Get DMA channel */
 372         siu_stream->chan = dma_request_channel(mask, filter, param);
 373         if (!siu_stream->chan) {
 374                 dev_err(dev, "DMA channel allocation failed!\n");
 375                 return -EBUSY;
 376         }
 377
 378         siu_stream->substream = ss;
 379
 380         return 0;
 381 }
 382
 383 static int siu_pcm_close(struct snd_pcm_substream *ss)
 384 {
 385         struct siu_info *info = siu_i2s_data;
 386         struct device *dev = ss->pcm->card->dev;
 387         struct siu_port *port_info = siu_port_info(ss);
 388         struct siu_stream *siu_stream;
 389
 390         dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
 391
 392         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 393                 siu_stream = &port_info->playback;
 394         else
 395                 siu_stream = &port_info->capture;
 396
 397         dma_release_channel(siu_stream->chan);
 398         siu_stream->chan = NULL;
 399
 400         siu_stream->substream = NULL;
 401
 402         return 0;
 403 }
 404
 405 static int siu_pcm_prepare(struct snd_pcm_substream *ss)
 406 {
 407         struct siu_info *info = siu_i2s_data;
 408         struct siu_port *port_info = siu_port_info(ss);
 409         struct device *dev = ss->pcm->card->dev;
 410         struct snd_pcm_runtime  *rt = ss->runtime;
 411         struct siu_stream *siu_stream;
 412         snd_pcm_sframes_t xfer_cnt;
 413
 414         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 415                 siu_stream = &port_info->playback;
 416         else
 417                 siu_stream = &port_info->capture;
 418
 419         rt = siu_stream->substream->runtime;
 420
 421         siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
 422         siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
 423
 424         dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
 425                 info->port_id, rt->channels, siu_stream->period_bytes);
 426
 427         /* We only support buffers that are multiples of the period */
 428         if (siu_stream->buf_bytes % siu_stream->period_bytes) {
 429                 dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
 430                        __func__, siu_stream->buf_bytes,
 431                        siu_stream->period_bytes);
 432                 return -EINVAL;
 433         }
 434
 435         xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
 436         if (!xfer_cnt || xfer_cnt > 0x1000000)
 437                 return -EINVAL;
 438
 439         siu_stream->format = rt->format;
 440         siu_stream->xfer_cnt = xfer_cnt;
 441
 442         dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
 443                 "format=%d channels=%d xfer_cnt=%d\n", info->port_id,
 444                 (unsigned long)rt->dma_addr, siu_stream->buf_bytes,
 445                 siu_stream->period_bytes,
 446                 siu_stream->format, rt->channels, (int)xfer_cnt);
 447
 448         return 0;
 449 }
 450
 451 static int siu_pcm_trigger(struct snd_pcm_substream *ss, int cmd)
 452 {
 453         struct siu_info *info = siu_i2s_data;
 454         struct device *dev = ss->pcm->card->dev;
 455         struct siu_port *port_info = siu_port_info(ss);
 456         int ret;
 457
 458         dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
 459                 info->port_id, port_info, cmd);
 460
 461         switch (cmd) {
 462         case SNDRV_PCM_TRIGGER_START:
 463                 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 464                         ret = siu_pcm_stmwrite_start(port_info);
 465                 else
 466                         ret = siu_pcm_stmread_start(port_info);
 467
 468                 if (ret < 0)
 469                         dev_warn(dev, "%s: start failed on port=%d\n",
 470                                  __func__, info->port_id);
 471
 472                 break;
 473         case SNDRV_PCM_TRIGGER_STOP:
 474                 if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 475                         siu_pcm_stmwrite_stop(port_info);
 476                 else
 477                         siu_pcm_stmread_stop(port_info);
 478                 ret = 0;
 479
 480                 break;
 481         default:
 482                 dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
 483                 ret = -EINVAL;
 484         }
 485
 486         return ret;
 487 }
 488
 489 /*
 490  * So far only resolution of one period is supported, subject to extending the
 491  * dmangine API
 492  */
 493 static snd_pcm_uframes_t siu_pcm_pointer_dma(struct snd_pcm_substream *ss)
 494 {
 495         struct device *dev = ss->pcm->card->dev;
 496         struct siu_info *info = siu_i2s_data;
 497         u32 __iomem *base = info->reg;
 498         struct siu_port *port_info = siu_port_info(ss);
 499         struct snd_pcm_runtime *rt = ss->runtime;
 500         size_t ptr;
 501         struct siu_stream *siu_stream;
 502
 503         if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
 504                 siu_stream = &port_info->playback;
 505         else
 506                 siu_stream = &port_info->capture;
 507
 508         /*
 509          * ptr is the offset into the buffer where the dma is currently at. We
 510          * check if the dma buffer has just wrapped.
 511          */
 512         ptr = PERIOD_OFFSET(rt->dma_addr,
 513                             siu_stream->cur_period,
 514                             siu_stream->period_bytes) - rt->dma_addr;
 515
 516         dev_dbg(dev,
 517                 "%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
 518                 __func__, info->port_id, siu_read32(base + SIU_EVNTC),
 519                 siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
 520                 siu_stream->cookie);
 521
 522         if (ptr >= siu_stream->buf_bytes)
 523                 ptr = 0;
 524
 525         return bytes_to_frames(ss->runtime, ptr);
 526 }
 527
 528 static int siu_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
 529                        struct snd_pcm *pcm)
 530 {
 531         /* card->dev == socdev->dev, see snd_soc_new_pcms() */
 532         struct siu_info *info = siu_i2s_data;
 533         struct platform_device *pdev = to_platform_device(card->dev);
 534         int ret;
 535         int i;
 536
 537         /* pdev->id selects between SIUA and SIUB */
 538         if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
 539                 return -EINVAL;
 540
 541         info->port_id = pdev->id;
 542
 543         /*
 544          * While the siu has 2 ports, only one port can be on at a time (only 1
 545          * SPB). So far all the boards using the siu had only one of the ports
 546          * wired to a codec. To simplify things, we only register one port with
 547          * alsa. In case both ports are needed, it should be changed here
 548          */
 549         for (i = pdev->id; i < pdev->id + 1; i++) {
 550                 struct siu_port **port_info = &siu_ports[i];
 551
 552                 ret = siu_init_port(i, port_info, card);
 553                 if (ret < 0)
 554                         return ret;
 555
 556                 ret = snd_pcm_lib_preallocate_pages_for_all(pcm,
 557                                 SNDRV_DMA_TYPE_DEV, NULL,
 558                                 SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
 559                 if (ret < 0) {
 560                         dev_err(card->dev,
 561                                "snd_pcm_lib_preallocate_pages_for_all() err=%d",
 562                                 ret);
 563                         goto fail;
 564                 }
 565
 566                 (*port_info)->pcm = pcm;
 567
 568                 /* IO tasklets */
 569                 tasklet_init(&(*port_info)->playback.tasklet, siu_io_tasklet,
 570                              (unsigned long)&(*port_info)->playback);
 571                 tasklet_init(&(*port_info)->capture.tasklet, siu_io_tasklet,
 572                              (unsigned long)&(*port_info)->capture);
 573         }
 574
 575         dev_info(card->dev, "SuperH SIU driver initialized.\n");
 576         return 0;
 577
 578 fail:
 579         siu_free_port(siu_ports[pdev->id]);
 580         dev_err(card->dev, "SIU: failed to initialize.\n");
 581         return ret;
 582 }
 583
 584 static void siu_pcm_free(struct snd_pcm *pcm)
 585 {
 586         struct platform_device *pdev = to_platform_device(pcm->card->dev);
 587         struct siu_port *port_info = siu_ports[pdev->id];
 588
 589         tasklet_kill(&port_info->capture.tasklet);
 590         tasklet_kill(&port_info->playback.tasklet);
 591
 592         siu_free_port(port_info);
 593         snd_pcm_lib_preallocate_free_for_all(pcm);
 594
 595         dev_dbg(pcm->card->dev, "%s\n", __func__);
 596 }
 597
 598 static struct snd_pcm_ops siu_pcm_ops = {
 599         .open           = siu_pcm_open,
 600         .close          = siu_pcm_close,
 601         .ioctl          = snd_pcm_lib_ioctl,
 602         .hw_params      = siu_pcm_hw_params,
 603         .hw_free        = siu_pcm_hw_free,
 604         .prepare        = siu_pcm_prepare,
 605         .trigger        = siu_pcm_trigger,
 606         .pointer        = siu_pcm_pointer_dma,
 607 };
 608
 609 struct snd_soc_platform_driver siu_platform = {
 610         .ops                    = &siu_pcm_ops,
 611         .pcm_new        = siu_pcm_new,
 612         .pcm_free       = siu_pcm_free,
 613 };
 614 EXPORT_SYMBOL_GPL(siu_platform);