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 "kirkwood.h"
  26
  27 #define DRV_NAME        "kirkwood-i2s"
  28
  29 #define KIRKWOOD_I2S_RATES \
  30         (SNDRV_PCM_RATE_44100 | \
  31          SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000)
  32 #define KIRKWOOD_I2S_FORMATS \
  33         (SNDRV_PCM_FMTBIT_S16_LE | \
  34          SNDRV_PCM_FMTBIT_S24_LE | \
  35          SNDRV_PCM_FMTBIT_S32_LE)
  36
  37 static int kirkwood_i2s_set_fmt(struct snd_soc_dai *cpu_dai,
  38                 unsigned int fmt)
  39 {
  40         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(cpu_dai);
  41         unsigned long mask;
  42         unsigned long value;
  43
  44         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  45         case SND_SOC_DAIFMT_RIGHT_J:
  46                 mask = KIRKWOOD_I2S_CTL_RJ;
  47                 break;
  48         case SND_SOC_DAIFMT_LEFT_J:
  49                 mask = KIRKWOOD_I2S_CTL_LJ;
  50                 break;
  51         case SND_SOC_DAIFMT_I2S:
  52                 mask = KIRKWOOD_I2S_CTL_I2S;
  53                 break;
  54         default:
  55                 return -EINVAL;
  56         }
  57
  58         /*
  59          * Set same format for playback and record
  60          * This avoids some troubles.
  61          */
  62         value = readl(priv->io+KIRKWOOD_I2S_PLAYCTL);
  63         value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
  64         value |= mask;
  65         writel(value, priv->io+KIRKWOOD_I2S_PLAYCTL);
  66
  67         value = readl(priv->io+KIRKWOOD_I2S_RECCTL);
  68         value &= ~KIRKWOOD_I2S_CTL_JUST_MASK;
  69         value |= mask;
  70         writel(value, priv->io+KIRKWOOD_I2S_RECCTL);
  71
  72         return 0;
  73 }
  74
  75 static inline void kirkwood_set_dco(void __iomem *io, unsigned long rate)
  76 {
  77         unsigned long value;
  78
  79         value = KIRKWOOD_DCO_CTL_OFFSET_0;
  80         switch (rate) {
  81         default:
  82         case 44100:
  83                 value |= KIRKWOOD_DCO_CTL_FREQ_11;
  84                 break;
  85         case 48000:
  86                 value |= KIRKWOOD_DCO_CTL_FREQ_12;
  87                 break;
  88         case 96000:
  89                 value |= KIRKWOOD_DCO_CTL_FREQ_24;
  90                 break;
  91         }
  92         writel(value, io + KIRKWOOD_DCO_CTL);
  93
  94         /* wait for dco locked */
  95         do {
  96                 cpu_relax();
  97                 value = readl(io + KIRKWOOD_DCO_SPCR_STATUS);
  98                 value &= KIRKWOOD_DCO_SPCR_STATUS_DCO_LOCK;
  99         } while (value == 0);
 100 }
 101
 102 static int kirkwood_i2s_startup(struct snd_pcm_substream *substream,
 103                 struct snd_soc_dai *dai)
 104 {
 105         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 106
 107         snd_soc_dai_set_dma_data(dai, substream, priv);
 108         return 0;
 109 }
 110
 111 static int kirkwood_i2s_hw_params(struct snd_pcm_substream *substream,
 112                                  struct snd_pcm_hw_params *params,
 113                                  struct snd_soc_dai *dai)
 114 {
 115         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 116         unsigned int i2s_reg, reg;
 117         unsigned long i2s_value, value;
 118
 119         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 120                 i2s_reg = KIRKWOOD_I2S_PLAYCTL;
 121                 reg = KIRKWOOD_PLAYCTL;
 122         } else {
 123                 i2s_reg = KIRKWOOD_I2S_RECCTL;
 124                 reg = KIRKWOOD_RECCTL;
 125         }
 126
 127         /* set dco conf */
 128         kirkwood_set_dco(priv->io, params_rate(params));
 129
 130         i2s_value = readl(priv->io+i2s_reg);
 131         i2s_value &= ~KIRKWOOD_I2S_CTL_SIZE_MASK;
 132
 133         value = readl(priv->io+reg);
 134         value &= ~KIRKWOOD_PLAYCTL_SIZE_MASK;
 135
 136         /*
 137          * Size settings in play/rec i2s control regs and play/rec control
 138          * regs must be the same.
 139          */
 140         switch (params_format(params)) {
 141         case SNDRV_PCM_FORMAT_S16_LE:
 142                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_16;
 143                 value |= KIRKWOOD_PLAYCTL_SIZE_16_C;
 144                 break;
 145         /*
 146          * doesn't work... S20_3LE != kirkwood 20bit format ?
 147          *
 148         case SNDRV_PCM_FORMAT_S20_3LE:
 149                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_20;
 150                 value |= KIRKWOOD_PLAYCTL_SIZE_20;
 151                 break;
 152         */
 153         case SNDRV_PCM_FORMAT_S24_LE:
 154                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_24;
 155                 value |= KIRKWOOD_PLAYCTL_SIZE_24;
 156                 break;
 157         case SNDRV_PCM_FORMAT_S32_LE:
 158                 i2s_value |= KIRKWOOD_I2S_CTL_SIZE_32;
 159                 value |= KIRKWOOD_PLAYCTL_SIZE_32;
 160                 break;
 161         default:
 162                 return -EINVAL;
 163         }
 164
 165         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 166                 value &= ~KIRKWOOD_PLAYCTL_MONO_MASK;
 167                 if (params_channels(params) == 1)
 168                         value |= KIRKWOOD_PLAYCTL_MONO_BOTH;
 169                 else
 170                         value |= KIRKWOOD_PLAYCTL_MONO_OFF;
 171         }
 172
 173         writel(i2s_value, priv->io+i2s_reg);
 174         writel(value, priv->io+reg);
 175
 176         return 0;
 177 }
 178
 179 static int kirkwood_i2s_play_trigger(struct snd_pcm_substream *substream,
 180                                 int cmd, struct snd_soc_dai *dai)
 181 {
 182         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 183         uint32_t ctl, value;
 184
 185         ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
 186         if (ctl & KIRKWOOD_PLAYCTL_PAUSE) {
 187                 unsigned timeout = 5000;
 188                 /*
 189                  * The Armada510 spec says that if we enter pause mode, the
 190                  * busy bit must be read back as clear _twice_.  Make sure
 191                  * we respect that otherwise we get DMA underruns.
 192                  */
 193                 do {
 194                         value = ctl;
 195                         ctl = readl(priv->io + KIRKWOOD_PLAYCTL);
 196                         if (!((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY))
 197                                 break;
 198                         udelay(1);
 199                 } while (timeout--);
 200
 201                 if ((ctl | value) & KIRKWOOD_PLAYCTL_PLAY_BUSY)
 202                         dev_notice(dai->dev, "timed out waiting for busy to deassert: %08x\n",
 203                                    ctl);
 204         }
 205
 206         switch (cmd) {
 207         case SNDRV_PCM_TRIGGER_START:
 208                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 209                 value |= KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 210                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 211
 212                 /* configure audio & enable i2s playback */
 213                 ctl &= ~KIRKWOOD_PLAYCTL_BURST_MASK;
 214                 ctl &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE
 215                                 | KIRKWOOD_PLAYCTL_SPDIF_EN);
 216
 217                 if (priv->burst == 32)
 218                         ctl |= KIRKWOOD_PLAYCTL_BURST_32;
 219                 else
 220                         ctl |= KIRKWOOD_PLAYCTL_BURST_128;
 221                 ctl |= KIRKWOOD_PLAYCTL_I2S_EN;
 222                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 223                 break;
 224
 225         case SNDRV_PCM_TRIGGER_STOP:
 226                 /* stop audio, disable interrupts */
 227                 ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
 228                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 229
 230                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 231                 value &= ~KIRKWOOD_INT_CAUSE_PLAY_BYTES;
 232                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 233
 234                 /* disable all playbacks */
 235                 ctl &= ~(KIRKWOOD_PLAYCTL_I2S_EN | KIRKWOOD_PLAYCTL_SPDIF_EN);
 236                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 237                 break;
 238
 239         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 240         case SNDRV_PCM_TRIGGER_SUSPEND:
 241                 ctl |= KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE;
 242                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 243                 break;
 244
 245         case SNDRV_PCM_TRIGGER_RESUME:
 246         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 247                 ctl &= ~(KIRKWOOD_PLAYCTL_PAUSE | KIRKWOOD_PLAYCTL_I2S_MUTE);
 248                 writel(ctl, priv->io + KIRKWOOD_PLAYCTL);
 249                 break;
 250
 251         default:
 252                 return -EINVAL;
 253         }
 254
 255         return 0;
 256 }
 257
 258 static int kirkwood_i2s_rec_trigger(struct snd_pcm_substream *substream,
 259                                 int cmd, struct snd_soc_dai *dai)
 260 {
 261         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 262         unsigned long value;
 263
 264         value = readl(priv->io + KIRKWOOD_RECCTL);
 265
 266         switch (cmd) {
 267         case SNDRV_PCM_TRIGGER_START:
 268                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 269                 value |= KIRKWOOD_INT_CAUSE_REC_BYTES;
 270                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 271
 272                 /* configure audio & enable i2s record */
 273                 value = readl(priv->io + KIRKWOOD_RECCTL);
 274                 value &= ~KIRKWOOD_RECCTL_BURST_MASK;
 275                 value &= ~KIRKWOOD_RECCTL_MONO;
 276                 value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE
 277                         | KIRKWOOD_RECCTL_SPDIF_EN);
 278
 279                 if (priv->burst == 32)
 280                         value |= KIRKWOOD_RECCTL_BURST_32;
 281                 else
 282                         value |= KIRKWOOD_RECCTL_BURST_128;
 283                 value |= KIRKWOOD_RECCTL_I2S_EN;
 284
 285                 writel(value, priv->io + KIRKWOOD_RECCTL);
 286                 break;
 287
 288         case SNDRV_PCM_TRIGGER_STOP:
 289                 /* stop audio, disable interrupts */
 290                 value = readl(priv->io + KIRKWOOD_RECCTL);
 291                 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 292                 writel(value, priv->io + KIRKWOOD_RECCTL);
 293
 294                 value = readl(priv->io + KIRKWOOD_INT_MASK);
 295                 value &= ~KIRKWOOD_INT_CAUSE_REC_BYTES;
 296                 writel(value, priv->io + KIRKWOOD_INT_MASK);
 297
 298                 /* disable all records */
 299                 value = readl(priv->io + KIRKWOOD_RECCTL);
 300                 value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 301                 writel(value, priv->io + KIRKWOOD_RECCTL);
 302                 break;
 303
 304         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 305         case SNDRV_PCM_TRIGGER_SUSPEND:
 306                 value = readl(priv->io + KIRKWOOD_RECCTL);
 307                 value |= KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE;
 308                 writel(value, priv->io + KIRKWOOD_RECCTL);
 309                 break;
 310
 311         case SNDRV_PCM_TRIGGER_RESUME:
 312         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 313                 value = readl(priv->io + KIRKWOOD_RECCTL);
 314                 value &= ~(KIRKWOOD_RECCTL_PAUSE | KIRKWOOD_RECCTL_MUTE);
 315                 writel(value, priv->io + KIRKWOOD_RECCTL);
 316                 break;
 317
 318         default:
 319                 return -EINVAL;
 320         }
 321
 322         return 0;
 323 }
 324
 325 static int kirkwood_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 326                                struct snd_soc_dai *dai)
 327 {
 328         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 329                 return kirkwood_i2s_play_trigger(substream, cmd, dai);
 330         else
 331                 return kirkwood_i2s_rec_trigger(substream, cmd, dai);
 332
 333         return 0;
 334 }
 335
 336 static int kirkwood_i2s_probe(struct snd_soc_dai *dai)
 337 {
 338         struct kirkwood_dma_data *priv = snd_soc_dai_get_drvdata(dai);
 339         unsigned long value;
 340         unsigned int reg_data;
 341
 342         /* put system in a "safe" state : */
 343         /* disable audio interrupts */
 344         writel(0xffffffff, priv->io + KIRKWOOD_INT_CAUSE);
 345         writel(0, priv->io + KIRKWOOD_INT_MASK);
 346
 347         reg_data = readl(priv->io + 0x1200);
 348         reg_data &= (~(0x333FF8));
 349         reg_data |= 0x111D18;
 350         writel(reg_data, priv->io + 0x1200);
 351
 352         msleep(500);
 353
 354         reg_data = readl(priv->io + 0x1200);
 355         reg_data &= (~(0x333FF8));
 356         reg_data |= 0x111D18;
 357         writel(reg_data, priv->io + 0x1200);
 358
 359         /* disable playback/record */
 360         value = readl(priv->io + KIRKWOOD_PLAYCTL);
 361         value &= ~(KIRKWOOD_PLAYCTL_I2S_EN|KIRKWOOD_PLAYCTL_SPDIF_EN);
 362         writel(value, priv->io + KIRKWOOD_PLAYCTL);
 363
 364         value = readl(priv->io + KIRKWOOD_RECCTL);
 365         value &= ~(KIRKWOOD_RECCTL_I2S_EN | KIRKWOOD_RECCTL_SPDIF_EN);
 366         writel(value, priv->io + KIRKWOOD_RECCTL);
 367
 368         return 0;
 369
 370 }
 371
 372 static int kirkwood_i2s_remove(struct snd_soc_dai *dai)
 373 {
 374         return 0;
 375 }
 376
 377 static const struct snd_soc_dai_ops kirkwood_i2s_dai_ops = {
 378         .startup        = kirkwood_i2s_startup,
 379         .trigger        = kirkwood_i2s_trigger,
 380         .hw_params      = kirkwood_i2s_hw_params,
 381         .set_fmt        = kirkwood_i2s_set_fmt,
 382 };
 383
 384
 385 static struct snd_soc_dai_driver kirkwood_i2s_dai = {
 386         .probe = kirkwood_i2s_probe,
 387         .remove = kirkwood_i2s_remove,
 388         .playback = {
 389                 .channels_min = 1,
 390                 .channels_max = 2,
 391                 .rates = KIRKWOOD_I2S_RATES,
 392                 .formats = KIRKWOOD_I2S_FORMATS,},
 393         .capture = {
 394                 .channels_min = 1,
 395                 .channels_max = 2,
 396                 .rates = KIRKWOOD_I2S_RATES,
 397                 .formats = KIRKWOOD_I2S_FORMATS,},
 398         .ops = &kirkwood_i2s_dai_ops,
 399 };
 400
 401 static __devinit int kirkwood_i2s_dev_probe(struct platform_device *pdev)
 402 {
 403         struct resource *mem;
 404         struct kirkwood_asoc_platform_data *data =
 405                 pdev->dev.platform_data;
 406         struct kirkwood_dma_data *priv;
 407         int err;
 408
 409         priv = kzalloc(sizeof(struct kirkwood_dma_data), GFP_KERNEL);
 410         if (!priv) {
 411                 dev_err(&pdev->dev, "allocation failed\n");
 412                 err = -ENOMEM;
 413                 goto error;
 414         }
 415         dev_set_drvdata(&pdev->dev, priv);
 416
 417         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 418         if (!mem) {
 419                 dev_err(&pdev->dev, "platform_get_resource failed\n");
 420                 err = -ENXIO;
 421                 goto err_alloc;
 422         }
 423
 424         priv->mem = request_mem_region(mem->start, SZ_16K, DRV_NAME);
 425         if (!priv->mem) {
 426                 dev_err(&pdev->dev, "request_mem_region failed\n");
 427                 err = -EBUSY;
 428                 goto err_alloc;
 429         }
 430
 431         priv->io = ioremap(priv->mem->start, SZ_16K);
 432         if (!priv->io) {
 433                 dev_err(&pdev->dev, "ioremap failed\n");
 434                 err = -ENOMEM;
 435                 goto err_iomem;
 436         }
 437
 438         priv->irq = platform_get_irq(pdev, 0);
 439         if (priv->irq <= 0) {
 440                 dev_err(&pdev->dev, "platform_get_irq failed\n");
 441                 err = -ENXIO;
 442                 goto err_ioremap;
 443         }
 444
 445         if (!data) {
 446                 dev_err(&pdev->dev, "no platform data ?!\n");
 447                 err = -EINVAL;
 448                 goto err_ioremap;
 449         }
 450
 451         priv->burst = data->burst;
 452
 453         priv->clk = clk_get(&pdev->dev, NULL);
 454         if (IS_ERR(priv->clk)) {
 455                 dev_err(&pdev->dev, "no clock\n");
 456                 err = PTR_ERR(priv->clk);
 457                 goto err_ioremap;
 458         }
 459         clk_prepare_enable(priv->clk);
 460
 461         err = snd_soc_register_dai(&pdev->dev, &kirkwood_i2s_dai);
 462         if (!err)
 463                 return 0;
 464         dev_err(&pdev->dev, "snd_soc_register_dai failed\n");
 465
 466         clk_disable_unprepare(priv->clk);
 467         clk_put(priv->clk);
 468
 469 err_ioremap:
 470         iounmap(priv->io);
 471 err_iomem:
 472         release_mem_region(priv->mem->start, SZ_16K);
 473 err_alloc:
 474         kfree(priv);
 475 error:
 476         return err;
 477 }
 478
 479 static __devexit int kirkwood_i2s_dev_remove(struct platform_device *pdev)
 480 {
 481         struct kirkwood_dma_data *priv = dev_get_drvdata(&pdev->dev);
 482
 483         snd_soc_unregister_dai(&pdev->dev);
 484
 485         clk_disable_unprepare(priv->clk);
 486         clk_put(priv->clk);
 487
 488         iounmap(priv->io);
 489         release_mem_region(priv->mem->start, SZ_16K);
 490         kfree(priv);
 491
 492         return 0;
 493 }
 494
 495 static struct platform_driver kirkwood_i2s_driver = {
 496         .probe  = kirkwood_i2s_dev_probe,
 497         .remove = __devexit_p(kirkwood_i2s_dev_remove),
 498         .driver = {
 499                 .name = DRV_NAME,
 500                 .owner = THIS_MODULE,
 501         },
 502 };
 503
 504 module_platform_driver(kirkwood_i2s_driver);
 505
 506 /* Module information */
 507 MODULE_AUTHOR("Arnaud Patard, <arnaud.patard@rtp-net.org>");
 508 MODULE_DESCRIPTION("Kirkwood I2S SoC Interface");
 509 MODULE_LICENSE("GPL");
 510 MODULE_ALIAS("platform:kirkwood-i2s");