sound/soc/kirkwood/kirkwood-i2s.c

   1 /*
   2  * kirkwood-i2s.c
   3  *
   4  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
   5  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/io.h>
  17 #include <linux/slab.h>
  18 #include <linux/mbus.h>
  19 #include <linux/delay.h>
  20 #include <linux/clk.h>
  21 #include <sound/pcm.h>
  22 #include <sound/pcm_params.h>
  23 #include <sound/soc.h>
  24 #include <linux/platform_data/asoc-kirkwood.h>
  25 #include <linux/of.h>
  26
  27 #include "kirkwood.h"
  28
  29 #define DRV_NAME        "mvebu-audio"
  30
  31 #define KIRKWOOD_I2S_FORMATS \
  32         (SNDRV_PCM_FMTBIT_S16_LE | \
  33          SNDRV_PCM_FMTBIT_S24_LE | \
  34          SNDRV_PCM_FMTBIT_S32_LE)
  35
  36 #define KIRKWOOD_SPDIF_FORMATS \
  37         (SNDRV_PCM_FMTBIT_S16_LE | \
  38          SNDRV_PCM_FMTBIT_S24_LE)
  39
  40 static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
  41                 unsigned int fmt)
  42 {
  43         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
  44         unsigned long mask;
  45         unsigned long value;
  46
  47         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  48         case SND_SOC_DAIFMT_RIGHT_J:
  49                 mask = KIRKWOOD_I2S_CTL_RJ;
  50                 break;
  51         case SND_SOC_DAIFMT_LEFT_J:
  52                 mask = KIRKWOOD_I2S_CTL_LJ;
  53                 break;
  54         case SND_SOC_DAIFMT_I2S:
  55                 mask = KIRKWOOD_I2S_CTL_I2S;
  56                 break;
  57         default:
  58                 return -EINVAL;
  59         }
  60
  61         /*
  62          * Set same format for playback and record
  63          * This avoids some troubles.
  64          */
  65         value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
  66         value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
  67         value |= mask;
  68         writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);
  69
  70         value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
  71         value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
  72         value |= mask;
  73         writel(value, priv->io+KIRKWOOD_I2S_RECCTL);
  74
  75         return 0;
  76 }
  77
  78 static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
  79 {
  80         unsigned long value;
  81
  82         value = KIRKWOOD_DCO_CTL_OFFSET_0;
  83         switch (rate) {
  84         default:
  85         case 44100:
  86                 value |= KIRKWOOD_DCO_CTL_FREQ_11;
  87                 break;
  88         case 48000:
  89                 value |= KIRKWOOD_DCO_CTL_FREQ_12;
  90                 break;
  91         case 96000:
  92                 value |= KIRKWOOD_DCO_CTL_FREQ_24;
  93                 break;
  94         }
  95         writel(value, io + KIRKWOOD_DCO_CTL);
  96
  97         /* wait for dco locked */
  98         do {
  99                 cpu_relax();
 100                 value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
 101                 value &= KIRKWOOD_DCO_SPCR_STATUS_DCO_LOCK;
 102         } while (value == 0);
 103 }
 104
 105 static void kirkwood_set_rate(struct snd_soc_dai *dai,
 106         struct kirkwood_dma_data *priv, unsigned long rate)
 107 {
 108         uint32_t clks_ctrl;
 109
 110         if (IS_ERR(priv->extclk)) {
 111                 /* use internal dco for the supported rates
 112                  * defined in kirkwood_i2s_dai */
 113                 dev_dbg(dai->dev, "%s: dco set rate = %lu\n",
 114                         __func__, rate);
 115                 kirkwood_set_dco(priv->io, rate);
 116
 117                 clks_ctrl = KIRKWOOD_MCLK_SOURCE_DCO;
 118         } else {
 119                 /* use the external clock for the other rates
 120                  * defined in kirkwood_i2s_dai_extclk */
 121                 dev_dbg(dai->dev, "%s: extclk set rate = %lu -> %lu\n",
 122                         __func__, rate, 256 * rate);
 123                 clk_set_rate(priv->extclk, 256 * rate);
 124
 125                 clks_ctrl = KIRKWOOD_MCLK_SOURCE_EXTCLK;
 126         }
 127         writel(clks_ctrl, priv->io + KIRKWOOD_CLOCKS_CTRL);
 128 }
 129
 130 static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
 131                 struct snd_soc_dai *dai)
 132 {
 133         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 134
 135         snd_soc_dai_set_dma_data(dai, substream, priv);
 136         return 0;
 137 }
 138
 139 static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
 140                                  struct snd_pcm_hw_params *params,
 141                                  struct snd_soc_dai *dai)
 142 {
 143         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 144         uint32_t ctl_play, ctl_rec;
 145         unsigned int i2s_reg;
 146         unsigned long i2s_value;
 147
 148         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 149                 i2s_reg = KIRKWOOD_I2S_PLAYCTL;
 150         } else {
 151                 i2s_reg = KIRKWOOD_I2S_RECCTL;
 152         }
 153
 154         kirkwood_set_rate(dai, priv, params_rate(params));
 155
 156         i2s_value = readl(priv->io+i2s_reg);
 157         i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
 158
 159         /*
 160          * Size settings in play/rec i2s control regs and play/rec control
 161          * regs must be the same.
 162          */
 163         switch (params_format(params)) {
 164         case SNDRV_PCM_FORMAT_S16_LE:
 165                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
 166                 ctl_play = KIRKWOOD_PLAYCTL_SIZE_16_C |
 167                            KIRKWOOD_PLAYCTL_I2S_EN |
 168                            KIRKWOOD_PLAYCTL_SPDIF_EN;
 169                 ctl_rec = KIRKWOOD_RECCTL_SIZE_16_C |
 170                           KIRKWOOD_RECCTL_I2S_EN |
 171                           KIRKWOOD_RECCTL_SPDIF_EN;
 172                 break;
 173         /*
 174          * doesn't work... S20_3LE != kirkwood 20bit format ?
 175          *
 176         case SNDRV_PCM_FORMAT_S20_3LE:
 177                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
 178                 ctl_play = KIRKWOOD_PLAYCTL_SIZE_20 |
 179                            KIRKWOOD_PLAYCTL_I2S_EN;
 180                 ctl_rec = KIRKWOOD_RECCTL_SIZE_20 |
 181                           KIRKWOOD_RECCTL_I2S_EN;
 182                 break;
 183         */
 184         case SNDRV_PCM_FORMAT_S24_LE:
 185                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
 186                 ctl_play = KIRKWOOD_PLAYCTL_SIZE_24 |
 187                            KIRKWOOD_PLAYCTL_I2S_EN |
 188                            KIRKWOOD_PLAYCTL_SPDIF_EN;
 189                 ctl_rec = KIRKWOOD_RECCTL_SIZE_24 |
 190                           KIRKWOOD_RECCTL_I2S_EN |
 191                           KIRKWOOD_RECCTL_SPDIF_EN;
 192                 break;
 193         case SNDRV_PCM_FORMAT_S32_LE:
 194                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
 195                 ctl_play = KIRKWOOD_PLAYCTL_SIZE_32 |
 196                            KIRKWOOD_PLAYCTL_I2S_EN;
 197                 ctl_rec = KIRKWOOD_RECCTL_SIZE_32 |
 198                           KIRKWOOD_RECCTL_I2S_EN;
 199                 break;
 200         default:
 201                 return -EINVAL;
 202         }
 203
 204         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 205                 if (params_channels(params) == 1)
 206                         ctl_play |= KIRKWOOD_PLAYCTL_MONO_BOTH;
 207                 else
 208                         ctl_play |= KIRKWOOD_PLAYCTL_MONO_OFF;
 209
 210                 priv->ctl_play &= ~(KIRKWOOD_PLAYCTL_MONO_MASK |
 211                                     KIRKWOOD_PLAYCTL_ENABLE_MASK |
 212                                     KIRKWOOD_PLAYCTL_SIZE_MASK);
 213                 priv->ctl_play |= ctl_play;
 214         } else {
 215                 priv->ctl_rec &= ~KIRKWOOD_RECCTL_SIZE_MASK;
 216                 priv->ctl_rec |= ctl_rec;
 217         }
 218
 219         writel(i2s_value, priv->io+i2s_reg);
 220
 221         return 0;
 222 }
 223
 224 static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
 225                                 int cmd, struct snd_soc_dai *dai)
 226 {
 227         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 228         uint32_t ctl, value;
 229
 230         ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
 231         if (ctl & KIRKWOOD_PLAYCTL_PAUSE) {
 232                 unsigned timeout = 5000;
 233                 /*
 234                  * The Armada510 spec says that if we enter pause mode, the
 235                  * busy bit must be read back as clear _twice_.  Make sure
 236                  * we respect that otherwise we get DMA underruns.
 237                  */
 238                 do {
 239                         value = ctl;
 240                         ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
 241                         if (!((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY))
 242                                 break;
 243                         udelay(1);
 244                 } while (timeout--);
 245
 246                 if ((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY)
 247                         dev_notice(dai->dev, "timed out waiting for busy to deassert: %08x\n",
 248                                    ctl);
 249         }
 250
 251         switch (cmd) {
 252         case SNDRV_PCM_TRIGGER_START:
 253                 /* configure */
 254                 ctl = priv->ctl_play;
 255                 if (dai->id == 0)
 256                         ctl &= ~KIRKWOOD_PLAYCTL_SPDIF_EN;      /* i2s */
 257                 else
 258                         ctl &= ~KIRKWOOD_PLAYCTL_I2S_EN;        /* spdif */
 259
 260                 value = ctl & ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
 261                 writel(value, priv->io + KIRKWOOD_PLAYCTL);
 262
 263                 /* enable interrupts */
 264                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 265                 value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 266                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 267
 268                 /* enable playback */
 269                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 270                 break;
 271
 272         case SNDRV_PCM_TRIGGER_STOP:
 273                 /* stop audio, disable interrupts */
 274                 ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE |
 275                                 KIRKWOOD_PLAYCTL_SPDIF_MUTE;
 276                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 277
 278                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 279                 value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 280                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 281
 282                 /* disable all playbacks */
 283                 ctl &= ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
 284                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 285                 break;
 286
 287         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 288         case SNDRV_PCM_TRIGGER_SUSPEND:
 289                 ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE |
 290                                 KIRKWOOD_PLAYCTL_SPDIF_MUTE;
 291                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 292                 break;
 293
 294         case SNDRV_PCM_TRIGGER_RESUME:
 295         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 296                 ctl &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE |
 297                                 KIRKWOOD_PLAYCTL_SPDIF_MUTE);
 298                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 299                 break;
 300
 301         default:
 302                 return -EINVAL;
 303         }
 304
 305         return 0;
 306 }
 307
 308 static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
 309                                 int cmd, struct snd_soc_dai *dai)
 310 {
 311         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 312         uint32_t ctl, value;
 313
 314         value = readl(priv->io + KIRKWOOD_RECCTL);
 315
 316         switch (cmd) {
 317         case SNDRV_PCM_TRIGGER_START:
 318                 /* configure */
 319                 ctl = priv->ctl_rec;
 320                 if (dai->id == 0)
 321                         ctl &= ~KIRKWOOD_RECCTL_SPDIF_EN;       /* i2s */
 322                 else
 323                         ctl &= ~KIRKWOOD_RECCTL_I2S_EN;         /* spdif */
 324
 325                 value = ctl & ~(KIRKWOOD_RECCTL_I2S_EN |
 326                                 KIRKWOOD_RECCTL_SPDIF_EN);
 327                 writel(value, priv->io + KIRKWOOD_RECCTL);
 328
 329                 /* enable interrupts */
 330                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 331                 value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
 332                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 333
 334                 /* enable record */
 335                 writel(ctl, priv->io + KIRKWOOD_RECCTL);
 336                 break;
 337
 338         case SNDRV_PCM_TRIGGER_STOP:
 339                 /* stop audio, disable interrupts */
 340                 value = readl(priv->io + KIRKWOOD_RECCTL);
 341                 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 342                 writel(value, priv->io + KIRKWOOD_RECCTL);
 343
 344                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 345                 value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
 346                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 347
 348                 /* disable all records */
 349                 value = readl(priv->io + KIRKWOOD_RECCTL);
 350                 value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 351                 writel(value, priv->io + KIRKWOOD_RECCTL);
 352                 break;
 353
 354         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 355         case SNDRV_PCM_TRIGGER_SUSPEND:
 356                 value = readl(priv->io + KIRKWOOD_RECCTL);
 357                 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 358                 writel(value, priv->io + KIRKWOOD_RECCTL);
 359                 break;
 360
 361         case SNDRV_PCM_TRIGGER_RESUME:
 362         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 363                 value = readl(priv->io + KIRKWOOD_RECCTL);
 364                 value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
 365                 writel(value, priv->io + KIRKWOOD_RECCTL);
 366                 break;
 367
 368         default:
 369                 return -EINVAL;
 370         }
 371
 372         return 0;
 373 }
 374
 375 static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 376                                struct snd_soc_dai *dai)
 377 {
 378         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 379                 return kirkwood_i2s_play_trigger(substream, cmd, dai);
 380         else
 381                 return kirkwood_i2s_rec_trigger(substream, cmd, dai);
 382
 383         return 0;
 384 }
 385
 386 static int kirkwood_i2s_init(struct kirkwood_dma_data *priv)
 387 {
 388         unsigned long value;
 389         unsigned int reg_data;
 390
 391         /* put system in a "safe" state : */
 392         /* disable audio interrupts */
 393         writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
 394         writel(0, priv->io + KIRKWOOD_INT_MASK);
 395
 396         reg_data = readl(priv->io + 0x1200);
 397         reg_data &= (~(0x333FF8));
 398         reg_data |= 0x111D18;
 399         writel(reg_data, priv->io + 0x1200);
 400
 401         msleep(500);
 402
 403         reg_data = readl(priv->io + 0x1200);
 404         reg_data &= (~(0x333FF8));
 405         reg_data |= 0x111D18;
 406         writel(reg_data, priv->io + 0x1200);
 407
 408         /* disable playback/record */
 409         value = readl(priv->io + KIRKWOOD_PLAYCTL);
 410         value &= ~KIRKWOOD_PLAYCTL_ENABLE_MASK;
 411         writel(value, priv->io + KIRKWOOD_PLAYCTL);
 412
 413         value = readl(priv->io + KIRKWOOD_RECCTL);
 414         value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 415         writel(value, priv->io + KIRKWOOD_RECCTL);
 416
 417         return 0;
 418
 419 }
 420
 421 static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
 422         .startup        = kirkwood_i2s_startup,
 423         .trigger        = kirkwood_i2s_trigger,
 424         .hw_params      = kirkwood_i2s_hw_params,
 425         .set_fmt        = kirkwood_i2s_set_fmt,
 426 };
 427
 428 static struct snd_soc_dai_driver kirkwood_i2s_dai[2] = {
 429     {
 430         .name = "i2s",
 431         .id = 0,
 432         .playback = {
 433                 .channels_min = 1,
 434                 .channels_max = 2,
 435                 .rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
 436                                 SNDRV_PCM_RATE_96000,
 437                 .formats = KIRKWOOD_I2S_FORMATS,
 438         },
 439         .capture = {
 440                 .channels_min = 1,
 441                 .channels_max = 2,
 442                 .rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
 443                                 SNDRV_PCM_RATE_96000,
 444                 .formats = KIRKWOOD_I2S_FORMATS,
 445         },
 446         .ops = &kirkwood_i2s_dai_ops,
 447     },
 448     {
 449         .name = "spdif",
 450         .id = 1,
 451         .playback = {
 452                 .channels_min = 1,
 453                 .channels_max = 2,
 454                 .rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
 455                                 SNDRV_PCM_RATE_96000,
 456                 .formats = KIRKWOOD_SPDIF_FORMATS,
 457         },
 458         .capture = {
 459                 .channels_min = 1,
 460                 .channels_max = 2,
 461                 .rates = SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
 462                                 SNDRV_PCM_RATE_96000,
 463                 .formats = KIRKWOOD_SPDIF_FORMATS,
 464         },
 465         .ops = &kirkwood_i2s_dai_ops,
 466     },
 467 };
 468
 469 static struct snd_soc_dai_driver kirkwood_i2s_dai_extclk[2] = {
 470     {
 471         .name = "i2s",
 472         .id = 0,
 473         .playback = {
 474                 .channels_min = 1,
 475                 .channels_max = 2,
 476                 .rates = SNDRV_PCM_RATE_8000_192000 |
 477                          SNDRV_PCM_RATE_CONTINUOUS |
 478                          SNDRV_PCM_RATE_KNOT,
 479                 .formats = KIRKWOOD_I2S_FORMATS,
 480         },
 481         .capture = {
 482                 .channels_min = 1,
 483                 .channels_max = 2,
 484                 .rates = SNDRV_PCM_RATE_8000_192000 |
 485                          SNDRV_PCM_RATE_CONTINUOUS |
 486                          SNDRV_PCM_RATE_KNOT,
 487                 .formats = KIRKWOOD_I2S_FORMATS,
 488         },
 489         .ops = &kirkwood_i2s_dai_ops,
 490     },
 491     {
 492         .name = "spdif",
 493         .id = 1,
 494         .playback = {
 495                 .channels_min = 1,
 496                 .channels_max = 2,
 497                 .rates = SNDRV_PCM_RATE_8000_192000 |
 498                          SNDRV_PCM_RATE_CONTINUOUS |
 499                          SNDRV_PCM_RATE_KNOT,
 500                 .formats = KIRKWOOD_SPDIF_FORMATS,
 501         },
 502         .capture = {
 503                 .channels_min = 1,
 504                 .channels_max = 2,
 505                 .rates = SNDRV_PCM_RATE_8000_192000 |
 506                          SNDRV_PCM_RATE_CONTINUOUS |
 507                          SNDRV_PCM_RATE_KNOT,
 508                 .formats = KIRKWOOD_SPDIF_FORMATS,
 509         },
 510         .ops = &kirkwood_i2s_dai_ops,
 511     },
 512 };
 513
 514 static const struct snd_soc_component_driver kirkwood_i2s_component = {
 515         .name           = DRV_NAME,
 516 };
 517
 518 static int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 519 {
 520         struct kirkwood_asoc_platform_data *data = pdev->dev.platform_data;
 521         struct snd_soc_dai_driver *soc_dai = kirkwood_i2s_dai;
 522         struct kirkwood_dma_data *priv;
 523         struct resource *mem;
 524         struct device_node *np = pdev->dev.of_node;
 525         int err;
 526
 527         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 528         if (!priv) {
 529                 dev_err(&pdev->dev, "allocation failed\n");
 530                 return -ENOMEM;
 531         }
 532         dev_set_drvdata(&pdev->dev, priv);
 533
 534         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 535         priv->io = devm_ioremap_resource(&pdev->dev, mem);
 536         if (IS_ERR(priv->io))
 537                 return PTR_ERR(priv->io);
 538
 539         priv->irq = platform_get_irq(pdev, 0);
 540         if (priv->irq <= 0) {
 541                 dev_err(&pdev->dev, "platform_get_irq failed\n");
 542                 return -ENXIO;
 543         }
 544
 545         if (np) {
 546                 priv->burst = 128;              /* might be 32 or 128 */
 547         } else if (data) {
 548                 priv->burst = data->burst;
 549         } else {
 550                 dev_err(&pdev->dev, "no DT nor platform data ?!\n");
 551                 return -EINVAL;
 552         }
 553
 554         priv->clk = devm_clk_get(&pdev->dev, np ? "internal" : NULL);
 555         if (IS_ERR(priv->clk)) {
 556                 dev_err(&pdev->dev, "no clock\n");
 557                 return PTR_ERR(priv->clk);
 558         }
 559
 560         err = clk_prepare_enable(priv->clk);
 561         if (err < 0)
 562                 return err;
 563
 564         priv->extclk = devm_clk_get(&pdev->dev, "extclk");
 565         if (IS_ERR(priv->extclk)) {
 566                 if (PTR_ERR(priv->extclk) == -EPROBE_DEFER)
 567                         return -EPROBE_DEFER;
 568         } else {
 569                 if (priv->extclk == priv->clk) {
 570                         devm_clk_put(&pdev->dev, priv->extclk);
 571                         priv->extclk = ERR_PTR(-EINVAL);
 572                 } else {
 573                         dev_info(&pdev->dev, "found external clock\n");
 574                         clk_prepare_enable(priv->extclk);
 575                         soc_dai = kirkwood_i2s_dai_extclk;
 576                 }
 577         }
 578
 579         /* Some sensible defaults - this reflects the powerup values */
 580         priv->ctl_play = KIRKWOOD_PLAYCTL_SIZE_24;
 581         priv->ctl_rec = KIRKWOOD_RECCTL_SIZE_24;
 582
 583         /* Select the burst size */
 584         if (priv->burst == 32) {
 585                 priv->ctl_play |= KIRKWOOD_PLAYCTL_BURST_32;
 586                 priv->ctl_rec |= KIRKWOOD_RECCTL_BURST_32;
 587         } else {
 588                 priv->ctl_play |= KIRKWOOD_PLAYCTL_BURST_128;
 589                 priv->ctl_rec |= KIRKWOOD_RECCTL_BURST_128;
 590         }
 591
 592         err = snd_soc_register_component(&pdev->dev, &kirkwood_i2s_component,
 593                                          soc_dai, 2);
 594         if (err) {
 595                 dev_err(&pdev->dev, "snd_soc_register_component failed\n");
 596                 goto err_component;
 597         }
 598
 599         err = snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform);
 600         if (err) {
 601                 dev_err(&pdev->dev, "snd_soc_register_platform failed\n");
 602                 goto err_platform;
 603         }
 604
 605         kirkwood_i2s_init(priv);
 606
 607         return 0;
 608  err_platform:
 609         snd_soc_unregister_component(&pdev->dev);
 610  err_component:
 611         if (!IS_ERR(priv->extclk))
 612                 clk_disable_unprepare(priv->extclk);
 613         clk_disable_unprepare(priv->clk);
 614
 615         return err;
 616 }
 617
 618 static int kirkwood_i2s_dev_remove(struct platform_device *pdev)
 619 {
 620         struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);
 621
 622         snd_soc_unregister_platform(&pdev->dev);
 623         snd_soc_unregister_component(&pdev->dev);
 624
 625         if (!IS_ERR(priv->extclk))
 626                 clk_disable_unprepare(priv->extclk);
 627         clk_disable_unprepare(priv->clk);
 628
 629         return 0;
 630 }
 631
 632 #ifdef CONFIG_OF
 633 static struct of_device_id mvebu_audio_of_match[] = {
 634         { .compatible = "marvell,kirkwood-audio" },
 635         { .compatible = "marvell,dove-audio" },
 636         { }
 637 };
 638 MODULE_DEVICE_TABLE(of, mvebu_audio_of_match);
 639 #endif
 640
 641 static struct platform_driver kirkwood_i2s_driver = {
 642         .probe  = kirkwood_i2s_dev_probe,
 643         .remove = kirkwood_i2s_dev_remove,
 644         .driver = {
 645                 .name = DRV_NAME,
 646                 .owner = THIS_MODULE,
 647                 .of_match_table = of_match_ptr(mvebu_audio_of_match),
 648         },
 649 };
 650
 651 module_platform_driver(kirkwood_i2s_driver);
 652
 653 /* Module information */
 654 MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
 655 MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
 656 MODULE_LICENSE("GPL");
 657 MODULE_ALIAS("platform:mvebu-audio");