sound/soc/omap/omap-mcbsp.c

   1 /*
   2  * omap-mcbsp.c  --  OMAP ALSA SoC DAI driver using McBSP port
   3  *
   4  * Copyright (C) 2008 Nokia Corporation
   5  *
   6  * Contact: Jarkko Nikula <jarkko.nikula@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/module.h>
  26 #include <linux/device.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/initval.h>
  31 #include <sound/soc.h>
  32
  33 #include <mach/control.h>
  34 #include <mach/dma.h>
  35 #include <mach/mcbsp.h>
  36 #include "omap-mcbsp.h"
  37 #include "omap-pcm.h"
  38
  39 #define OMAP_MCBSP_RATES        (SNDRV_PCM_RATE_8000_96000)
  40
  41 struct omap_mcbsp_data {
  42         unsigned int                    bus_id;
  43         struct omap_mcbsp_reg_cfg       regs;
  44         unsigned int                    fmt;
  45         /*
  46          * Flags indicating is the bus already activated and configured by
  47          * another substream
  48          */
  49         int                             active;
  50         int                             configured;
  51 };
  52
  53 #define to_mcbsp(priv)  container_of((priv), struct omap_mcbsp_data, bus_id)
  54
  55 static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];
  56
  57 /*
  58  * Stream DMA parameters. DMA request line and port address are set runtime
  59  * since they are different between OMAP1 and later OMAPs
  60  */
  61 static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2];
  62
  63 #if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
  64 static const int omap1_dma_reqs[][2] = {
  65         { OMAP_DMA_MCBSP1_TX, OMAP_DMA_MCBSP1_RX },
  66         { OMAP_DMA_MCBSP2_TX, OMAP_DMA_MCBSP2_RX },
  67         { OMAP_DMA_MCBSP3_TX, OMAP_DMA_MCBSP3_RX },
  68 };
  69 static const unsigned long omap1_mcbsp_port[][2] = {
  70         { OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
  71           OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
  72         { OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
  73           OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
  74         { OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DXR1,
  75           OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DRR1 },
  76 };
  77 #else
  78 static const int omap1_dma_reqs[][2] = {};
  79 static const unsigned long omap1_mcbsp_port[][2] = {};
  80 #endif
  81
  82 #if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
  83 static const int omap24xx_dma_reqs[][2] = {
  84         { OMAP24XX_DMA_MCBSP1_TX, OMAP24XX_DMA_MCBSP1_RX },
  85         { OMAP24XX_DMA_MCBSP2_TX, OMAP24XX_DMA_MCBSP2_RX },
  86 #if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
  87         { OMAP24XX_DMA_MCBSP3_TX, OMAP24XX_DMA_MCBSP3_RX },
  88         { OMAP24XX_DMA_MCBSP4_TX, OMAP24XX_DMA_MCBSP4_RX },
  89         { OMAP24XX_DMA_MCBSP5_TX, OMAP24XX_DMA_MCBSP5_RX },
  90 #endif
  91 };
  92 #else
  93 static const int omap24xx_dma_reqs[][2] = {};
  94 #endif
  95
  96 #if defined(CONFIG_ARCH_OMAP2420)
  97 static const unsigned long omap2420_mcbsp_port[][2] = {
  98         { OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
  99           OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
 100         { OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
 101           OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
 102 };
 103 #else
 104 static const unsigned long omap2420_mcbsp_port[][2] = {};
 105 #endif
 106
 107 #if defined(CONFIG_ARCH_OMAP2430)
 108 static const unsigned long omap2430_mcbsp_port[][2] = {
 109         { OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
 110           OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
 111         { OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
 112           OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
 113         { OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
 114           OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
 115         { OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
 116           OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
 117         { OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
 118           OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
 119 };
 120 #else
 121 static const unsigned long omap2430_mcbsp_port[][2] = {};
 122 #endif
 123
 124 #if defined(CONFIG_ARCH_OMAP34XX)
 125 static const unsigned long omap34xx_mcbsp_port[][2] = {
 126         { OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
 127           OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
 128         { OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
 129           OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
 130         { OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
 131           OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
 132         { OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
 133           OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
 134         { OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
 135           OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
 136 };
 137 #else
 138 static const unsigned long omap34xx_mcbsp_port[][2] = {};
 139 #endif
 140
 141 static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
 142                                   struct snd_soc_dai *dai)
 143 {
 144         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 145         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 146         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 147         int err = 0;
 148
 149         if (!cpu_dai->active)
 150                 err = omap_mcbsp_request(mcbsp_data->bus_id);
 151
 152         return err;
 153 }
 154
 155 static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream,
 156                                     struct snd_soc_dai *dai)
 157 {
 158         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 159         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 160         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 161
 162         if (!cpu_dai->active) {
 163                 omap_mcbsp_free(mcbsp_data->bus_id);
 164                 mcbsp_data->configured = 0;
 165         }
 166 }
 167
 168 static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 169                                   struct snd_soc_dai *dai)
 170 {
 171         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 172         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 173         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 174         int err = 0;
 175
 176         switch (cmd) {
 177         case SNDRV_PCM_TRIGGER_START:
 178         case SNDRV_PCM_TRIGGER_RESUME:
 179         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 180                 if (!mcbsp_data->active++)
 181                         omap_mcbsp_start(mcbsp_data->bus_id);
 182                 break;
 183
 184         case SNDRV_PCM_TRIGGER_STOP:
 185         case SNDRV_PCM_TRIGGER_SUSPEND:
 186         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 187                 if (!--mcbsp_data->active)
 188                         omap_mcbsp_stop(mcbsp_data->bus_id);
 189                 break;
 190         default:
 191                 err = -EINVAL;
 192         }
 193
 194         return err;
 195 }
 196
 197 static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
 198                                     struct snd_pcm_hw_params *params,
 199                                     struct snd_soc_dai *dai)
 200 {
 201         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 202         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 203         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 204         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 205         int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
 206         int wlen, channels;
 207         unsigned long port;
 208
 209         if (cpu_class_is_omap1()) {
 210                 dma = omap1_dma_reqs[bus_id][substream->stream];
 211                 port = omap1_mcbsp_port[bus_id][substream->stream];
 212         } else if (cpu_is_omap2420()) {
 213                 dma = omap24xx_dma_reqs[bus_id][substream->stream];
 214                 port = omap2420_mcbsp_port[bus_id][substream->stream];
 215         } else if (cpu_is_omap2430()) {
 216                 dma = omap24xx_dma_reqs[bus_id][substream->stream];
 217                 port = omap2430_mcbsp_port[bus_id][substream->stream];
 218         } else if (cpu_is_omap343x()) {
 219                 dma = omap24xx_dma_reqs[bus_id][substream->stream];
 220                 port = omap34xx_mcbsp_port[bus_id][substream->stream];
 221         } else {
 222                 return -ENODEV;
 223         }
 224         omap_mcbsp_dai_dma_params[id][substream->stream].name =
 225                 substream->stream ? "Audio Capture" : "Audio Playback";
 226         omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
 227         omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
 228         cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];
 229
 230         if (mcbsp_data->configured) {
 231                 /* McBSP already configured by another stream */
 232                 return 0;
 233         }
 234
 235         channels = params_channels(params);
 236         switch (channels) {
 237         case 2:
 238                 /* Use dual-phase frames */
 239                 regs->rcr2      |= RPHASE;
 240                 regs->xcr2      |= XPHASE;
 241         case 1:
 242                 /* Set 1 word per (McBSP) frame */
 243                 regs->rcr2      |= RFRLEN2(1 - 1);
 244                 regs->rcr1      |= RFRLEN1(1 - 1);
 245                 regs->xcr2      |= XFRLEN2(1 - 1);
 246                 regs->xcr1      |= XFRLEN1(1 - 1);
 247                 break;
 248         default:
 249                 /* Unsupported number of channels */
 250                 return -EINVAL;
 251         }
 252
 253         switch (params_format(params)) {
 254         case SNDRV_PCM_FORMAT_S16_LE:
 255                 /* Set word lengths */
 256                 wlen = 16;
 257                 regs->rcr2      |= RWDLEN2(OMAP_MCBSP_WORD_16);
 258                 regs->rcr1      |= RWDLEN1(OMAP_MCBSP_WORD_16);
 259                 regs->xcr2      |= XWDLEN2(OMAP_MCBSP_WORD_16);
 260                 regs->xcr1      |= XWDLEN1(OMAP_MCBSP_WORD_16);
 261                 break;
 262         default:
 263                 /* Unsupported PCM format */
 264                 return -EINVAL;
 265         }
 266
 267         /* Set FS period and length in terms of bit clock periods */
 268         switch (mcbsp_data->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 269         case SND_SOC_DAIFMT_I2S:
 270                 regs->srgr2     |= FPER(wlen * 2 - 1);
 271                 regs->srgr1     |= FWID(wlen - 1);
 272                 break;
 273         case SND_SOC_DAIFMT_DSP_B:
 274                 regs->srgr2     |= FPER(wlen * channels - 1);
 275                 regs->srgr1     |= FWID(wlen * channels - 2);
 276                 break;
 277         }
 278
 279         omap_mcbsp_config(bus_id, &mcbsp_data->regs);
 280         mcbsp_data->configured = 1;
 281
 282         return 0;
 283 }
 284
 285 /*
 286  * This must be called before _set_clkdiv and _set_sysclk since McBSP register
 287  * cache is initialized here
 288  */
 289 static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 290                                       unsigned int fmt)
 291 {
 292         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 293         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 294
 295         if (mcbsp_data->configured)
 296                 return 0;
 297
 298         mcbsp_data->fmt = fmt;
 299         memset(regs, 0, sizeof(*regs));
 300         /* Generic McBSP register settings */
 301         regs->spcr2     |= XINTM(3) | FREE;
 302         regs->spcr1     |= RINTM(3);
 303         regs->rcr2      |= RFIG;
 304         regs->xcr2      |= XFIG;
 305         if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 306                 regs->xccr = DXENDLY(1) | XDMAEN;
 307                 regs->rccr = RFULL_CYCLE | RDMAEN;
 308         }
 309
 310         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 311         case SND_SOC_DAIFMT_I2S:
 312                 /* 1-bit data delay */
 313                 regs->rcr2      |= RDATDLY(1);
 314                 regs->xcr2      |= XDATDLY(1);
 315                 break;
 316         case SND_SOC_DAIFMT_DSP_B:
 317                 /* 0-bit data delay */
 318                 regs->rcr2      |= RDATDLY(0);
 319                 regs->xcr2      |= XDATDLY(0);
 320                 break;
 321         default:
 322                 /* Unsupported data format */
 323                 return -EINVAL;
 324         }
 325
 326         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 327         case SND_SOC_DAIFMT_CBS_CFS:
 328                 /* McBSP master. Set FS and bit clocks as outputs */
 329                 regs->pcr0      |= FSXM | FSRM |
 330                                    CLKXM | CLKRM;
 331                 /* Sample rate generator drives the FS */
 332                 regs->srgr2     |= FSGM;
 333                 break;
 334         case SND_SOC_DAIFMT_CBM_CFM:
 335                 /* McBSP slave */
 336                 break;
 337         default:
 338                 /* Unsupported master/slave configuration */
 339                 return -EINVAL;
 340         }
 341
 342         /* Set bit clock (CLKX/CLKR) and FS polarities */
 343         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 344         case SND_SOC_DAIFMT_NB_NF:
 345                 /*
 346                  * Normal BCLK + FS.
 347                  * FS active low. TX data driven on falling edge of bit clock
 348                  * and RX data sampled on rising edge of bit clock.
 349                  */
 350                 regs->pcr0      |= FSXP | FSRP |
 351                                    CLKXP | CLKRP;
 352                 break;
 353         case SND_SOC_DAIFMT_NB_IF:
 354                 regs->pcr0      |= CLKXP | CLKRP;
 355                 break;
 356         case SND_SOC_DAIFMT_IB_NF:
 357                 regs->pcr0      |= FSXP | FSRP;
 358                 break;
 359         case SND_SOC_DAIFMT_IB_IF:
 360                 break;
 361         default:
 362                 return -EINVAL;
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
 369                                      int div_id, int div)
 370 {
 371         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 372         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 373
 374         if (div_id != OMAP_MCBSP_CLKGDV)
 375                 return -ENODEV;
 376
 377         regs->srgr1     |= CLKGDV(div - 1);
 378
 379         return 0;
 380 }
 381
 382 static int omap_mcbsp_dai_set_clks_src(struct omap_mcbsp_data *mcbsp_data,
 383                                        int clk_id)
 384 {
 385         int sel_bit;
 386         u16 reg, reg_devconf1 = OMAP243X_CONTROL_DEVCONF1;
 387
 388         if (cpu_class_is_omap1()) {
 389                 /* OMAP1's can use only external source clock */
 390                 if (unlikely(clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK))
 391                         return -EINVAL;
 392                 else
 393                         return 0;
 394         }
 395
 396         if (cpu_is_omap2420() && mcbsp_data->bus_id > 1)
 397                 return -EINVAL;
 398
 399         if (cpu_is_omap343x())
 400                 reg_devconf1 = OMAP343X_CONTROL_DEVCONF1;
 401
 402         switch (mcbsp_data->bus_id) {
 403         case 0:
 404                 reg = OMAP2_CONTROL_DEVCONF0;
 405                 sel_bit = 2;
 406                 break;
 407         case 1:
 408                 reg = OMAP2_CONTROL_DEVCONF0;
 409                 sel_bit = 6;
 410                 break;
 411         case 2:
 412                 reg = reg_devconf1;
 413                 sel_bit = 0;
 414                 break;
 415         case 3:
 416                 reg = reg_devconf1;
 417                 sel_bit = 2;
 418                 break;
 419         case 4:
 420                 reg = reg_devconf1;
 421                 sel_bit = 4;
 422                 break;
 423         default:
 424                 return -EINVAL;
 425         }
 426
 427         if (clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK)
 428                 omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);
 429         else
 430                 omap_ctrl_writel(omap_ctrl_readl(reg) | (1 << sel_bit), reg);
 431
 432         return 0;
 433 }
 434
 435 static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 436                                          int clk_id, unsigned int freq,
 437                                          int dir)
 438 {
 439         struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
 440         struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
 441         int err = 0;
 442
 443         switch (clk_id) {
 444         case OMAP_MCBSP_SYSCLK_CLK:
 445                 regs->srgr2     |= CLKSM;
 446                 break;
 447         case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
 448         case OMAP_MCBSP_SYSCLK_CLKS_EXT:
 449                 err = omap_mcbsp_dai_set_clks_src(mcbsp_data, clk_id);
 450                 break;
 451
 452         case OMAP_MCBSP_SYSCLK_CLKX_EXT:
 453                 regs->srgr2     |= CLKSM;
 454         case OMAP_MCBSP_SYSCLK_CLKR_EXT:
 455                 regs->pcr0      |= SCLKME;
 456                 break;
 457         default:
 458                 err = -ENODEV;
 459         }
 460
 461         return err;
 462 }
 463
 464 static struct snd_soc_dai_ops omap_mcbsp_dai_ops = {
 465         .startup        = omap_mcbsp_dai_startup,
 466         .shutdown       = omap_mcbsp_dai_shutdown,
 467         .trigger        = omap_mcbsp_dai_trigger,
 468         .hw_params      = omap_mcbsp_dai_hw_params,
 469         .set_fmt        = omap_mcbsp_dai_set_dai_fmt,
 470         .set_clkdiv     = omap_mcbsp_dai_set_clkdiv,
 471         .set_sysclk     = omap_mcbsp_dai_set_dai_sysclk,
 472 };
 473
 474 #define OMAP_MCBSP_DAI_BUILDER(link_id)                         \
 475 {                                                               \
 476         .name = "omap-mcbsp-dai-"#link_id,                      \
 477         .id = (link_id),                                        \
 478         .playback = {                                           \
 479                 .channels_min = 1,                              \
 480                 .channels_max = 2,                              \
 481                 .rates = OMAP_MCBSP_RATES,                      \
 482                 .formats = SNDRV_PCM_FMTBIT_S16_LE,             \
 483         },                                                      \
 484         .capture = {                                            \
 485                 .channels_min = 1,                              \
 486                 .channels_max = 2,                              \
 487                 .rates = OMAP_MCBSP_RATES,                      \
 488                 .formats = SNDRV_PCM_FMTBIT_S16_LE,             \
 489         },                                                      \
 490         .ops = &omap_mcbsp_dai_ops,                             \
 491         .private_data = &mcbsp_data[(link_id)].bus_id,          \
 492 }
 493
 494 struct snd_soc_dai omap_mcbsp_dai[] = {
 495         OMAP_MCBSP_DAI_BUILDER(0),
 496         OMAP_MCBSP_DAI_BUILDER(1),
 497 #if NUM_LINKS >= 3
 498         OMAP_MCBSP_DAI_BUILDER(2),
 499 #endif
 500 #if NUM_LINKS == 5
 501         OMAP_MCBSP_DAI_BUILDER(3),
 502         OMAP_MCBSP_DAI_BUILDER(4),
 503 #endif
 504 };
 505
 506 EXPORT_SYMBOL_GPL(omap_mcbsp_dai);
 507
 508 static int __init snd_omap_mcbsp_init(void)
 509 {
 510         return snd_soc_register_dais(omap_mcbsp_dai,
 511                                      ARRAY_SIZE(omap_mcbsp_dai));
 512 }
 513 module_init(snd_omap_mcbsp_init);
 514
 515 static void __exit snd_omap_mcbsp_exit(void)
 516 {
 517         snd_soc_unregister_dais(omap_mcbsp_dai, ARRAY_SIZE(omap_mcbsp_dai));
 518 }
 519 module_exit(snd_omap_mcbsp_exit);
 520
 521 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
 522 MODULE_DESCRIPTION("OMAP I2S SoC Interface");
 523 MODULE_LICENSE("GPL");