sound/soc/davinci/davinci-i2s.c

   1 /*
   2  * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
   3  *
   4  * Author:      Vladimir Barinov, <vbarinov@embeddedalley.com>
   5  * Copyright:   (C) 2007 MontaVista Software, Inc., <source@mvista.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 version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/device.h>
  15 #include <linux/delay.h>
  16 #include <linux/io.h>
  17 #include <linux/clk.h>
  18
  19 #include <sound/core.h>
  20 #include <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/initval.h>
  23 #include <sound/soc.h>
  24
  25 #include "davinci-pcm.h"
  26
  27 #define DAVINCI_MCBSP_DRR_REG   0x00
  28 #define DAVINCI_MCBSP_DXR_REG   0x04
  29 #define DAVINCI_MCBSP_SPCR_REG  0x08
  30 #define DAVINCI_MCBSP_RCR_REG   0x0c
  31 #define DAVINCI_MCBSP_XCR_REG   0x10
  32 #define DAVINCI_MCBSP_SRGR_REG  0x14
  33 #define DAVINCI_MCBSP_PCR_REG   0x24
  34
  35 #define DAVINCI_MCBSP_SPCR_RRST         (1 << 0)
  36 #define DAVINCI_MCBSP_SPCR_RINTM(v)     ((v) << 4)
  37 #define DAVINCI_MCBSP_SPCR_XRST         (1 << 16)
  38 #define DAVINCI_MCBSP_SPCR_XINTM(v)     ((v) << 20)
  39 #define DAVINCI_MCBSP_SPCR_GRST         (1 << 22)
  40 #define DAVINCI_MCBSP_SPCR_FRST         (1 << 23)
  41 #define DAVINCI_MCBSP_SPCR_FREE         (1 << 25)
  42
  43 #define DAVINCI_MCBSP_RCR_RWDLEN1(v)    ((v) << 5)
  44 #define DAVINCI_MCBSP_RCR_RFRLEN1(v)    ((v) << 8)
  45 #define DAVINCI_MCBSP_RCR_RDATDLY(v)    ((v) << 16)
  46 #define DAVINCI_MCBSP_RCR_RWDLEN2(v)    ((v) << 21)
  47
  48 #define DAVINCI_MCBSP_XCR_XWDLEN1(v)    ((v) << 5)
  49 #define DAVINCI_MCBSP_XCR_XFRLEN1(v)    ((v) << 8)
  50 #define DAVINCI_MCBSP_XCR_XDATDLY(v)    ((v) << 16)
  51 #define DAVINCI_MCBSP_XCR_XFIG          (1 << 18)
  52 #define DAVINCI_MCBSP_XCR_XWDLEN2(v)    ((v) << 21)
  53
  54 #define DAVINCI_MCBSP_SRGR_FWID(v)      ((v) << 8)
  55 #define DAVINCI_MCBSP_SRGR_FPER(v)      ((v) << 16)
  56 #define DAVINCI_MCBSP_SRGR_FSGM         (1 << 28)
  57
  58 #define DAVINCI_MCBSP_PCR_CLKRP         (1 << 0)
  59 #define DAVINCI_MCBSP_PCR_CLKXP         (1 << 1)
  60 #define DAVINCI_MCBSP_PCR_FSRP          (1 << 2)
  61 #define DAVINCI_MCBSP_PCR_FSXP          (1 << 3)
  62 #define DAVINCI_MCBSP_PCR_SCLKME        (1 << 7)
  63 #define DAVINCI_MCBSP_PCR_CLKRM         (1 << 8)
  64 #define DAVINCI_MCBSP_PCR_CLKXM         (1 << 9)
  65 #define DAVINCI_MCBSP_PCR_FSRM          (1 << 10)
  66 #define DAVINCI_MCBSP_PCR_FSXM          (1 << 11)
  67
  68 #define MOD_REG_BIT(val, mask, set) do { \
  69         if (set) { \
  70                 val |= mask; \
  71         } else { \
  72                 val &= ~mask; \
  73         } \
  74 } while (0)
  75
  76 enum {
  77         DAVINCI_MCBSP_WORD_8 = 0,
  78         DAVINCI_MCBSP_WORD_12,
  79         DAVINCI_MCBSP_WORD_16,
  80         DAVINCI_MCBSP_WORD_20,
  81         DAVINCI_MCBSP_WORD_24,
  82         DAVINCI_MCBSP_WORD_32,
  83 };
  84
  85 static struct davinci_pcm_dma_params davinci_i2s_pcm_out = {
  86         .name = "I2S PCM Stereo out",
  87 };
  88
  89 static struct davinci_pcm_dma_params davinci_i2s_pcm_in = {
  90         .name = "I2S PCM Stereo in",
  91 };
  92
  93 struct davinci_mcbsp_dev {
  94         void __iomem                    *base;
  95         struct clk                      *clk;
  96         struct davinci_pcm_dma_params   *dma_params[2];
  97 };
  98
  99 static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
 100                                            int reg, u32 val)
 101 {
 102         __raw_writel(val, dev->base + reg);
 103 }
 104
 105 static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
 106 {
 107         return __raw_readl(dev->base + reg);
 108 }
 109
 110 static void davinci_mcbsp_start(struct snd_pcm_substream *substream)
 111 {
 112         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 113         struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
 114         struct snd_soc_device *socdev = rtd->socdev;
 115         struct snd_soc_platform *platform = socdev->card->platform;
 116         u32 w;
 117         int ret;
 118
 119         /* Start the sample generator and enable transmitter/receiver */
 120         w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 121         MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST, 1);
 122         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 123
 124         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 125                 /* Stop the DMA to avoid data loss */
 126                 /* while the transmitter is out of reset to handle XSYNCERR */
 127                 if (platform->pcm_ops->trigger) {
 128                         ret = platform->pcm_ops->trigger(substream,
 129                                 SNDRV_PCM_TRIGGER_STOP);
 130                         if (ret < 0)
 131                                 printk(KERN_DEBUG "Playback DMA stop failed\n");
 132                 }
 133
 134                 /* Enable the transmitter */
 135                 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 136                 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 1);
 137                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 138
 139                 /* wait for any unexpected frame sync error to occur */
 140                 udelay(100);
 141
 142                 /* Disable the transmitter to clear any outstanding XSYNCERR */
 143                 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 144                 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 0);
 145                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 146
 147                 /* Restart the DMA */
 148                 if (platform->pcm_ops->trigger) {
 149                         ret = platform->pcm_ops->trigger(substream,
 150                                 SNDRV_PCM_TRIGGER_START);
 151                         if (ret < 0)
 152                                 printk(KERN_DEBUG "Playback DMA start failed\n");
 153                 }
 154                 /* Enable the transmitter */
 155                 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 156                 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 1);
 157                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 158
 159         } else {
 160
 161                 /* Enable the reciever */
 162                 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 163                 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 1);
 164                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 165         }
 166
 167
 168         /* Start frame sync */
 169         w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 170         MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_FRST, 1);
 171         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 172 }
 173
 174 static void davinci_mcbsp_stop(struct snd_pcm_substream *substream)
 175 {
 176         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 177         struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
 178         u32 w;
 179
 180         /* Reset transmitter/receiver and sample rate/frame sync generators */
 181         w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 182         MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_GRST |
 183                        DAVINCI_MCBSP_SPCR_FRST, 0);
 184         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 185                 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_XRST, 0);
 186         else
 187                 MOD_REG_BIT(w, DAVINCI_MCBSP_SPCR_RRST, 0);
 188         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 189 }
 190
 191 static int davinci_i2s_startup(struct snd_pcm_substream *substream,
 192                                struct snd_soc_dai *dai)
 193 {
 194         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 195         struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
 196         struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
 197
 198         cpu_dai->dma_data = dev->dma_params[substream->stream];
 199
 200         return 0;
 201 }
 202
 203 #define DEFAULT_BITPERSAMPLE    16
 204
 205 static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 206                                    unsigned int fmt)
 207 {
 208         struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
 209         unsigned int pcr;
 210         unsigned int srgr;
 211         unsigned int rcr;
 212         unsigned int xcr;
 213         srgr = DAVINCI_MCBSP_SRGR_FSGM |
 214                 DAVINCI_MCBSP_SRGR_FPER(DEFAULT_BITPERSAMPLE * 2 - 1) |
 215                 DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1);
 216
 217         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 218         case SND_SOC_DAIFMT_CBS_CFS:
 219                 /* cpu is master */
 220                 pcr = DAVINCI_MCBSP_PCR_FSXM |
 221                         DAVINCI_MCBSP_PCR_FSRM |
 222                         DAVINCI_MCBSP_PCR_CLKXM |
 223                         DAVINCI_MCBSP_PCR_CLKRM;
 224                 break;
 225         case SND_SOC_DAIFMT_CBM_CFS:
 226                 /* McBSP CLKR pin is the input for the Sample Rate Generator.
 227                  * McBSP FSR and FSX are driven by the Sample Rate Generator. */
 228                 pcr = DAVINCI_MCBSP_PCR_SCLKME |
 229                         DAVINCI_MCBSP_PCR_FSXM |
 230                         DAVINCI_MCBSP_PCR_FSRM;
 231                 break;
 232         case SND_SOC_DAIFMT_CBM_CFM:
 233                 /* codec is master */
 234                 pcr = 0;
 235                 break;
 236         default:
 237                 printk(KERN_ERR "%s:bad master\n", __func__);
 238                 return -EINVAL;
 239         }
 240
 241         rcr = DAVINCI_MCBSP_RCR_RFRLEN1(1);
 242         xcr = DAVINCI_MCBSP_XCR_XFIG | DAVINCI_MCBSP_XCR_XFRLEN1(1);
 243         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 244         case SND_SOC_DAIFMT_RIGHT_J:
 245                 break;
 246         case SND_SOC_DAIFMT_I2S:
 247         case SND_SOC_DAIFMT_DSP_B:
 248                 rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1);
 249                 xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1);
 250                 break;
 251         default:
 252                 printk(KERN_ERR "%s:bad format\n", __func__);
 253                 return -EINVAL;
 254         }
 255
 256         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 257         case SND_SOC_DAIFMT_IB_NF:
 258                 /* CLKRP Receive clock polarity,
 259                  *      1 - sampled on rising edge of CLKR
 260                  *      valid on rising edge
 261                  * CLKXP Transmit clock polarity,
 262                  *      1 - clocked on falling edge of CLKX
 263                  *      valid on rising edge
 264                  * FSRP  Receive frame sync pol, 0 - active high
 265                  * FSXP  Transmit frame sync pol, 0 - active high
 266                  */
 267                 pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP);
 268                 break;
 269         case SND_SOC_DAIFMT_NB_IF:
 270                 /* CLKRP Receive clock polarity,
 271                  *      0 - sampled on falling edge of CLKR
 272                  *      valid on falling edge
 273                  * CLKXP Transmit clock polarity,
 274                  *      0 - clocked on rising edge of CLKX
 275                  *      valid on falling edge
 276                  * FSRP  Receive frame sync pol, 1 - active low
 277                  * FSXP  Transmit frame sync pol, 1 - active low
 278                  */
 279                 pcr |= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
 280                 break;
 281         case SND_SOC_DAIFMT_IB_IF:
 282                 /* CLKRP Receive clock polarity,
 283                  *      1 - sampled on rising edge of CLKR
 284                  *      valid on rising edge
 285                  * CLKXP Transmit clock polarity,
 286                  *      1 - clocked on falling edge of CLKX
 287                  *      valid on rising edge
 288                  * FSRP  Receive frame sync pol, 1 - active low
 289                  * FSXP  Transmit frame sync pol, 1 - active low
 290                  */
 291                 pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP |
 292                         DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
 293                 break;
 294         case SND_SOC_DAIFMT_NB_NF:
 295                 /* CLKRP Receive clock polarity,
 296                  *      0 - sampled on falling edge of CLKR
 297                  *      valid on falling edge
 298                  * CLKXP Transmit clock polarity,
 299                  *      0 - clocked on rising edge of CLKX
 300                  *      valid on falling edge
 301                  * FSRP  Receive frame sync pol, 0 - active high
 302                  * FSXP  Transmit frame sync pol, 0 - active high
 303                  */
 304                 break;
 305         default:
 306                 return -EINVAL;
 307         }
 308         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
 309         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, pcr);
 310         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, rcr);
 311         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, xcr);
 312         return 0;
 313 }
 314
 315 static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
 316                                  struct snd_pcm_hw_params *params,
 317                                  struct snd_soc_dai *dai)
 318 {
 319         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 320         struct davinci_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
 321         struct davinci_mcbsp_dev *dev = rtd->dai->cpu_dai->private_data;
 322         struct snd_interval *i = NULL;
 323         int mcbsp_word_length;
 324         u32 w;
 325
 326         /* general line settings */
 327         w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
 328         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 329                 w |= DAVINCI_MCBSP_SPCR_RINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
 330                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 331         } else {
 332                 w |= DAVINCI_MCBSP_SPCR_XINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
 333                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, w);
 334         }
 335
 336         i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
 337         w = DAVINCI_MCBSP_SRGR_FSGM;
 338         MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1), 1);
 339
 340         i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
 341         MOD_REG_BIT(w, DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1), 1);
 342         davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, w);
 343
 344         /* Determine xfer data type */
 345         switch (params_format(params)) {
 346         case SNDRV_PCM_FORMAT_S8:
 347                 dma_params->data_type = 1;
 348                 mcbsp_word_length = DAVINCI_MCBSP_WORD_8;
 349                 break;
 350         case SNDRV_PCM_FORMAT_S16_LE:
 351                 dma_params->data_type = 2;
 352                 mcbsp_word_length = DAVINCI_MCBSP_WORD_16;
 353                 break;
 354         case SNDRV_PCM_FORMAT_S32_LE:
 355                 dma_params->data_type = 4;
 356                 mcbsp_word_length = DAVINCI_MCBSP_WORD_32;
 357                 break;
 358         default:
 359                 printk(KERN_WARNING "davinci-i2s: unsupported PCM format\n");
 360                 return -EINVAL;
 361         }
 362
 363         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 364                 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_RCR_REG);
 365                 MOD_REG_BIT(w, DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
 366                                DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length), 1);
 367                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, w);
 368
 369         } else {
 370                 w = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_XCR_REG);
 371                 MOD_REG_BIT(w, DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
 372                                DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length), 1);
 373                 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, w);
 374
 375         }
 376         return 0;
 377 }
 378
 379 static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 380                                struct snd_soc_dai *dai)
 381 {
 382         int ret = 0;
 383
 384         switch (cmd) {
 385         case SNDRV_PCM_TRIGGER_START:
 386         case SNDRV_PCM_TRIGGER_RESUME:
 387         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 388                 davinci_mcbsp_start(substream);
 389                 break;
 390         case SNDRV_PCM_TRIGGER_STOP:
 391         case SNDRV_PCM_TRIGGER_SUSPEND:
 392         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 393                 davinci_mcbsp_stop(substream);
 394                 break;
 395         default:
 396                 ret = -EINVAL;
 397         }
 398
 399         return ret;
 400 }
 401
 402 static int davinci_i2s_probe(struct platform_device *pdev,
 403                              struct snd_soc_dai *dai)
 404 {
 405         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 406         struct snd_soc_card *card = socdev->card;
 407         struct snd_soc_dai *cpu_dai = card->dai_link[pdev->id].cpu_dai;
 408         struct davinci_mcbsp_dev *dev;
 409         struct resource *mem, *ioarea;
 410         struct evm_snd_platform_data *pdata;
 411         int ret;
 412
 413         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 414         if (!mem) {
 415                 dev_err(&pdev->dev, "no mem resource?\n");
 416                 return -ENODEV;
 417         }
 418
 419         ioarea = request_mem_region(mem->start, (mem->end - mem->start) + 1,
 420                                     pdev->name);
 421         if (!ioarea) {
 422                 dev_err(&pdev->dev, "McBSP region already claimed\n");
 423                 return -EBUSY;
 424         }
 425
 426         dev = kzalloc(sizeof(struct davinci_mcbsp_dev), GFP_KERNEL);
 427         if (!dev) {
 428                 ret = -ENOMEM;
 429                 goto err_release_region;
 430         }
 431
 432         cpu_dai->private_data = dev;
 433
 434         dev->clk = clk_get(&pdev->dev, "McBSPCLK");
 435         if (IS_ERR(dev->clk)) {
 436                 ret = -ENODEV;
 437                 goto err_free_mem;
 438         }
 439         clk_enable(dev->clk);
 440
 441         dev->base = (void __iomem *)IO_ADDRESS(mem->start);
 442         pdata = pdev->dev.platform_data;
 443
 444         dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK] = &davinci_i2s_pcm_out;
 445         dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->channel = pdata->tx_dma_ch;
 446         dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK]->dma_addr =
 447             (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DXR_REG);
 448
 449         dev->dma_params[SNDRV_PCM_STREAM_CAPTURE] = &davinci_i2s_pcm_in;
 450         dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->channel = pdata->rx_dma_ch;
 451         dev->dma_params[SNDRV_PCM_STREAM_CAPTURE]->dma_addr =
 452             (dma_addr_t)(io_v2p(dev->base) + DAVINCI_MCBSP_DRR_REG);
 453
 454         return 0;
 455
 456 err_free_mem:
 457         kfree(dev);
 458 err_release_region:
 459         release_mem_region(mem->start, (mem->end - mem->start) + 1);
 460
 461         return ret;
 462 }
 463
 464 static void davinci_i2s_remove(struct platform_device *pdev,
 465                                struct snd_soc_dai *dai)
 466 {
 467         struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 468         struct snd_soc_card *card = socdev->card;
 469         struct snd_soc_dai *cpu_dai = card->dai_link[pdev->id].cpu_dai;
 470         struct davinci_mcbsp_dev *dev = cpu_dai->private_data;
 471         struct resource *mem;
 472
 473         clk_disable(dev->clk);
 474         clk_put(dev->clk);
 475         dev->clk = NULL;
 476
 477         kfree(dev);
 478
 479         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 480         release_mem_region(mem->start, (mem->end - mem->start) + 1);
 481 }
 482
 483 #define DAVINCI_I2S_RATES       SNDRV_PCM_RATE_8000_96000
 484
 485 struct snd_soc_dai davinci_i2s_dai = {
 486         .name = "davinci-i2s",
 487         .id = 0,
 488         .probe = davinci_i2s_probe,
 489         .remove = davinci_i2s_remove,
 490         .playback = {
 491                 .channels_min = 2,
 492                 .channels_max = 2,
 493                 .rates = DAVINCI_I2S_RATES,
 494                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 495         .capture = {
 496                 .channels_min = 2,
 497                 .channels_max = 2,
 498                 .rates = DAVINCI_I2S_RATES,
 499                 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
 500         .ops = {
 501                 .startup = davinci_i2s_startup,
 502                 .trigger = davinci_i2s_trigger,
 503                 .hw_params = davinci_i2s_hw_params,
 504                 .set_fmt = davinci_i2s_set_dai_fmt,
 505         },
 506 };
 507 EXPORT_SYMBOL_GPL(davinci_i2s_dai);
 508
 509 static int __init davinci_i2s_init(void)
 510 {
 511         return snd_soc_register_dai(&davinci_i2s_dai);
 512 }
 513 module_init(davinci_i2s_init);
 514
 515 static void __exit davinci_i2s_exit(void)
 516 {
 517         snd_soc_unregister_dai(&davinci_i2s_dai);
 518 }
 519 module_exit(davinci_i2s_exit);
 520
 521 MODULE_AUTHOR("Vladimir Barinov");
 522 MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
 523 MODULE_LICENSE("GPL");