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 <sound/pcm.h>
  21 #include <sound/pcm_params.h>
  22 #include <sound/soc.h>
  23 #include <plat/audio.h>
  24 #include "kirkwood.h"
  25
  26 #define DRV_NAME        "kirkwood-i2s"
  27
  28 #define KIRKWOOD_I2S_RATES \
  29         (SNDRV_PCM_RATE_44100 | \
  30          SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
  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 static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
  37                 unsigned int fmt)
  38 {
  39         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
  40         unsigned long mask;
  41         unsigned long value;
  42
  43         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  44         case SND_SOC_DAIFMT_RIGHT_J:
  45                 mask = KIRKWOOD_I2S_CTL_RJ;
  46                 break;
  47         case SND_SOC_DAIFMT_LEFT_J:
  48                 mask = KIRKWOOD_I2S_CTL_LJ;
  49                 break;
  50         case SND_SOC_DAIFMT_I2S:
  51                 mask = KIRKWOOD_I2S_CTL_I2S;
  52                 break;
  53         default:
  54                 return -EINVAL;
  55         }
  56
  57         /*
  58          * Set same format for playback and record
  59          * This avoids some troubles.
  60          */
  61         value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
  62         value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
  63         value |= mask;
  64         writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);
  65
  66         value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
  67         value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
  68         value |= mask;
  69         writel(value, priv->io+KIRKWOOD_I2S_RECCTL);
  70
  71         return 0;
  72 }
  73
  74 static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
  75 {
  76         unsigned long value;
  77
  78         value = KIRKWOOD_DCO_CTL_OFFSET_0;
  79         switch (rate) {
  80         default:
  81         case 44100:
  82                 value |= KIRKWOOD_DCO_CTL_FREQ_11;
  83                 break;
  84         case 48000:
  85                 value |= KIRKWOOD_DCO_CTL_FREQ_12;
  86                 break;
  87         case 96000:
  88                 value |= KIRKWOOD_DCO_CTL_FREQ_24;
  89                 break;
  90         }
  91         writel(value, io + KIRKWOOD_DCO_CTL);
  92
  93         /* wait for dco locked */
  94         do {
  95                 cpu_relax();
  96                 value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
  97                 value &= KIRKWOOD_DCO_SPCR_STATUS;
  98         } while (value == 0);
  99 }
 100
 101 static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
 102                 struct snd_soc_dai *dai)
 103 {
 104         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 105
 106         snd_soc_dai_set_dma_data(dai, substream, priv);
 107         return 0;
 108 }
 109
 110 static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
 111                                  struct snd_pcm_hw_params *params,
 112                                  struct snd_soc_dai *dai)
 113 {
 114         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 115         unsigned int i2s_reg, reg;
 116         unsigned long i2s_value, value;
 117
 118         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 119                 i2s_reg = KIRKWOOD_I2S_PLAYCTL;
 120                 reg = KIRKWOOD_PLAYCTL;
 121         } else {
 122                 i2s_reg = KIRKWOOD_I2S_RECCTL;
 123                 reg = KIRKWOOD_RECCTL;
 124         }
 125
 126         /* set dco conf */
 127         kirkwood_set_dco(priv->io, params_rate(params));
 128
 129         i2s_value = readl(priv->io+i2s_reg);
 130         i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
 131
 132         value = readl(priv->io+reg);
 133         value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;
 134
 135         /*
 136          * Size settings in play/rec i2s control regs and play/rec control
 137          * regs must be the same.
 138          */
 139         switch (params_format(params)) {
 140         case SNDRV_PCM_FORMAT_S16_LE:
 141                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
 142                 value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
 143                 break;
 144         /*
 145          * doesn't work... S20_3LE != kirkwood 20bit format ?
 146          *
 147         case SNDRV_PCM_FORMAT_S20_3LE:
 148                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
 149                 value |= KIRKWOOD_PLAYCTL_SIZE_20;
 150                 break;
 151         */
 152         case SNDRV_PCM_FORMAT_S24_LE:
 153                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
 154                 value |= KIRKWOOD_PLAYCTL_SIZE_24;
 155                 break;
 156         case SNDRV_PCM_FORMAT_S32_LE:
 157                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
 158                 value |= KIRKWOOD_PLAYCTL_SIZE_32;
 159                 break;
 160         default:
 161                 return -EINVAL;
 162         }
 163
 164         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 165                 value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
 166                 if (params_channels(params) == 1)
 167                         value |= KIRKWOOD_PLAYCTL_MONO_BOTH;
 168                 else
 169                         value |= KIRKWOOD_PLAYCTL_MONO_OFF;
 170         }
 171
 172         writel(i2s_value, priv->io+i2s_reg);
 173         writel(value, priv->io+reg);
 174
 175         return 0;
 176 }
 177
 178 static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
 179                                 int cmd, struct snd_soc_dai *dai)
 180 {
 181         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 182         unsigned long value;
 183
 184         /*
 185          * specs says KIRKWOOD_PLAYCTL must be read 2 times before
 186          * changing it. So read 1 time here and 1 later.
 187          */
 188         value = readl(priv->io + KIRKWOOD_PLAYCTL);
 189
 190         switch (cmd) {
 191         case SNDRV_PCM_TRIGGER_START:
 192                 /* stop audio, enable interrupts */
 193                 value = readl(priv->io + KIRKWOOD_PLAYCTL);
 194                 value |= KIRKWOOD_PLAYCTL_PAUSE;
 195                 writel(value, priv->io + KIRKWOOD_PLAYCTL);
 196
 197                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 198                 value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 199                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 200
 201                 /* configure audio & enable i2s playback */
 202                 value = readl(priv->io + KIRKWOOD_PLAYCTL);
 203                 value &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
 204                 value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE
 205                                 | KIRKWOOD_PLAYCTL_SPDIF_EN);
 206
 207                 if (priv->burst == 32)
 208                         value |= KIRKWOOD_PLAYCTL_BURST_32;
 209                 else
 210                         value |= KIRKWOOD_PLAYCTL_BURST_128;
 211                 value |= KIRKWOOD_PLAYCTL_I2S_EN;
 212                 writel(value, priv->io + KIRKWOOD_PLAYCTL);
 213                 break;
 214
 215         case SNDRV_PCM_TRIGGER_STOP:
 216                 /* stop audio, disable interrupts */
 217                 value = readl(priv->io + KIRKWOOD_PLAYCTL);
 218                 value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
 219                 writel(value, priv->io + KIRKWOOD_PLAYCTL);
 220
 221                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 222                 value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 223                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 224
 225                 /* disable all playbacks */
 226                 value = readl(priv->io + KIRKWOOD_PLAYCTL);
 227                 value &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
 228                 writel(value, priv->io + KIRKWOOD_PLAYCTL);
 229                 break;
 230
 231         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 232         case SNDRV_PCM_TRIGGER_SUSPEND:
 233                 value = readl(priv->io + KIRKWOOD_PLAYCTL);
 234                 value |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
 235                 writel(value, priv->io + KIRKWOOD_PLAYCTL);
 236                 break;
 237
 238         case SNDRV_PCM_TRIGGER_RESUME:
 239         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 240                 value = readl(priv->io + KIRKWOOD_PLAYCTL);
 241                 value &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE);
 242                 writel(value, priv->io + KIRKWOOD_PLAYCTL);
 243                 break;
 244
 245         default:
 246                 return -EINVAL;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
 253                                 int cmd, struct snd_soc_dai *dai)
 254 {
 255         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 256         unsigned long value;
 257
 258         value = readl(priv->io + KIRKWOOD_RECCTL);
 259
 260         switch (cmd) {
 261         case SNDRV_PCM_TRIGGER_START:
 262                 /* stop audio, enable interrupts */
 263                 value = readl(priv->io + KIRKWOOD_RECCTL);
 264                 value |= KIRKWOOD_RECCTL_PAUSE;
 265                 writel(value, priv->io + KIRKWOOD_RECCTL);
 266
 267                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 268                 value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
 269                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 270
 271                 /* configure audio & enable i2s record */
 272                 value = readl(priv->io + KIRKWOOD_RECCTL);
 273                 value &= ~KIRKWOOD_RECCTL_BURST_MASK;
 274                 value &= ~KIRKWOOD_RECCTL_MONO;
 275                 value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE
 276                         | KIRKWOOD_RECCTL_SPDIF_EN);
 277
 278                 if (priv->burst == 32)
 279                         value |= KIRKWOOD_RECCTL_BURST_32;
 280                 else
 281                         value |= KIRKWOOD_RECCTL_BURST_128;
 282                 value |= KIRKWOOD_RECCTL_I2S_EN;
 283
 284                 writel(value, priv->io + KIRKWOOD_RECCTL);
 285                 break;
 286
 287         case SNDRV_PCM_TRIGGER_STOP:
 288                 /* stop audio, disable interrupts */
 289                 value = readl(priv->io + KIRKWOOD_RECCTL);
 290                 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 291                 writel(value, priv->io + KIRKWOOD_RECCTL);
 292
 293                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 294                 value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
 295                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 296
 297                 /* disable all records */
 298                 value = readl(priv->io + KIRKWOOD_RECCTL);
 299                 value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 300                 writel(value, priv->io + KIRKWOOD_RECCTL);
 301                 break;
 302
 303         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 304         case SNDRV_PCM_TRIGGER_SUSPEND:
 305                 value = readl(priv->io + KIRKWOOD_RECCTL);
 306                 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 307                 writel(value, priv->io + KIRKWOOD_RECCTL);
 308                 break;
 309
 310         case SNDRV_PCM_TRIGGER_RESUME:
 311         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 312                 value = readl(priv->io + KIRKWOOD_RECCTL);
 313                 value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
 314                 writel(value, priv->io + KIRKWOOD_RECCTL);
 315                 break;
 316
 317         default:
 318                 return -EINVAL;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 325                                struct snd_soc_dai *dai)
 326 {
 327         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 328                 return kirkwood_i2s_play_trigger(substream, cmd, dai);
 329         else
 330                 return kirkwood_i2s_rec_trigger(substream, cmd, dai);
 331
 332         return 0;
 333 }
 334
 335 static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
 336 {
 337         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 338         unsigned long value;
 339         unsigned int reg_data;
 340
 341         /* put system in a "safe" state : */
 342         /* disable audio interrupts */
 343         writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
 344         writel(0, priv->io + KIRKWOOD_INT_MASK);
 345
 346         reg_data = readl(priv->io + 0x1200);
 347         reg_data &= (~(0x333FF8));
 348         reg_data |= 0x111D18;
 349         writel(reg_data, priv->io + 0x1200);
 350
 351         msleep(500);
 352
 353         reg_data = readl(priv->io + 0x1200);
 354         reg_data &= (~(0x333FF8));
 355         reg_data |= 0x111D18;
 356         writel(reg_data, priv->io + 0x1200);
 357
 358         /* disable playback/record */
 359         value = readl(priv->io + KIRKWOOD_PLAYCTL);
 360         value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
 361         writel(value, priv->io + KIRKWOOD_PLAYCTL);
 362
 363         value = readl(priv->io + KIRKWOOD_RECCTL);
 364         value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 365         writel(value, priv->io + KIRKWOOD_RECCTL);
 366
 367         return 0;
 368
 369 }
 370
 371 static int kirkwood_i2s_remove(struct snd_soc_dai *dai)
 372 {
 373         return 0;
 374 }
 375
 376 static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
 377         .startup        = kirkwood_i2s_startup,
 378         .trigger        = kirkwood_i2s_trigger,
 379         .hw_params      = kirkwood_i2s_hw_params,
 380         .set_fmt        = kirkwood_i2s_set_fmt,
 381 };
 382
 383
 384 static struct snd_soc_dai_driver kirkwood_i2s_dai = {
 385         .probe = kirkwood_i2s_probe,
 386         .remove = kirkwood_i2s_remove,
 387         .playback = {
 388                 .channels_min = 1,
 389                 .channels_max = 2,
 390                 .rates = KIRKWOOD_I2S_RATES,
 391                 .formats = KIRKWOOD_I2S_FORMATS,},
 392         .capture = {
 393                 .channels_min = 1,
 394                 .channels_max = 2,
 395                 .rates = KIRKWOOD_I2S_RATES,
 396                 .formats = KIRKWOOD_I2S_FORMATS,},
 397         .ops = &kirkwood_i2s_dai_ops,
 398 };
 399
 400 static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 401 {
 402         struct resource *mem;
 403         struct kirkwood_asoc_platform_data *data =
 404                 pdev->dev.platform_data;
 405         struct kirkwood_dma_data *priv;
 406         int err;
 407
 408         priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
 409         if (!priv) {
 410                 dev_err(&pdev->dev, "allocation failed\n");
 411                 err = -ENOMEM;
 412                 goto error;
 413         }
 414         dev_set_drvdata(&pdev->dev, priv);
 415
 416         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 417         if (!mem) {
 418                 dev_err(&pdev->dev, "platform_get_resource failed\n");
 419                 err = -ENXIO;
 420                 goto err_alloc;
 421         }
 422
 423         priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
 424         if (!priv->mem) {
 425                 dev_err(&pdev->dev, "request_mem_region failed\n");
 426                 err = -EBUSY;
 427                 goto err_alloc;
 428         }
 429
 430         priv->io = ioremap(priv->mem->start, SZ_16K);
 431         if (!priv->io) {
 432                 dev_err(&pdev->dev, "ioremap failed\n");
 433                 err = -ENOMEM;
 434                 goto err_iomem;
 435         }
 436
 437         priv->irq = platform_get_irq(pdev, 0);
 438         if (priv->irq <= 0) {
 439                 dev_err(&pdev->dev, "platform_get_irq failed\n");
 440                 err = -ENXIO;
 441                 goto err_ioremap;
 442         }
 443
 444         if (!data) {
 445                 dev_err(&pdev->dev, "no platform data ?!\n");
 446                 err = -EINVAL;
 447                 goto err_ioremap;
 448         }
 449
 450         priv->burst = data->burst;
 451
 452         return snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);
 453
 454 err_ioremap:
 455         iounmap(priv->io);
 456 err_iomem:
 457         release_mem_region(priv->mem->start, SZ_16K);
 458 err_alloc:
 459         kfree(priv);
 460 error:
 461         return err;
 462 }
 463
 464 static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
 465 {
 466         struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);
 467
 468         snd_soc_unregister_dai(&pdev->dev);
 469         iounmap(priv->io);
 470         release_mem_region(priv->mem->start, SZ_16K);
 471         kfree(priv);
 472
 473         return 0;
 474 }
 475
 476 static struct platform_driver kirkwood_i2s_driver = {
 477         .probe  = kirkwood_i2s_dev_probe,
 478         .remove = __devexit_p(kirkwood_i2s_dev_remove),
 479         .driver = {
 480                 .name = DRV_NAME,
 481                 .owner = THIS_MODULE,
 482         },
 483 };
 484
 485 module_platform_driver(kirkwood_i2s_driver);
 486
 487 /* Module information */
 488 MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
 489 MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
 490 MODULE_LICENSE("GPL");
 491 MODULE_ALIAS("platform:kirkwood-i2s");