sound/soc/s6000/s6000-i2s.c

   1 /*
   2  * ALSA SoC I2S Audio Layer for the Stretch S6000 family
   3  *
   4  * Author:      Daniel Gloeckner, <dg@emlix.com>
   5  * Copyright:   (C) 2009 emlix GmbH <info@emlix.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/clk.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/io.h>
  19 #include <linux/slab.h>
  20
  21 #include <sound/core.h>
  22 #include <sound/pcm.h>
  23 #include <sound/pcm_params.h>
  24 #include <sound/initval.h>
  25 #include <sound/soc.h>
  26
  27 #include "s6000-i2s.h"
  28 #include "s6000-pcm.h"
  29
  30 struct s6000_i2s_dev {
  31         dma_addr_t sifbase;
  32         u8 __iomem *scbbase;
  33         unsigned int wide;
  34         unsigned int channel_in;
  35         unsigned int channel_out;
  36         unsigned int lines_in;
  37         unsigned int lines_out;
  38         struct s6000_pcm_dma_params dma_params;
  39 };
  40
  41 #define S6_I2S_INTERRUPT_STATUS 0x00
  42 #define   S6_I2S_INT_OVERRUN    1
  43 #define   S6_I2S_INT_UNDERRUN   2
  44 #define   S6_I2S_INT_ALIGNMENT  4
  45 #define S6_I2S_INTERRUPT_ENABLE 0x04
  46 #define S6_I2S_INTERRUPT_RAW    0x08
  47 #define S6_I2S_INTERRUPT_CLEAR  0x0C
  48 #define S6_I2S_INTERRUPT_SET    0x10
  49 #define S6_I2S_MODE             0x20
  50 #define   S6_I2S_DUAL           0
  51 #define   S6_I2S_WIDE           1
  52 #define S6_I2S_TX_DEFAULT       0x24
  53 #define S6_I2S_DATA_CFG(c)      (0x40 + 0x10 * (c))
  54 #define   S6_I2S_IN             0
  55 #define   S6_I2S_OUT            1
  56 #define   S6_I2S_UNUSED         2
  57 #define S6_I2S_INTERFACE_CFG(c) (0x44 + 0x10 * (c))
  58 #define   S6_I2S_DIV_MASK       0x001fff
  59 #define   S6_I2S_16BIT          0x000000
  60 #define   S6_I2S_20BIT          0x002000
  61 #define   S6_I2S_24BIT          0x004000
  62 #define   S6_I2S_32BIT          0x006000
  63 #define   S6_I2S_BITS_MASK      0x006000
  64 #define   S6_I2S_MEM_16BIT      0x000000
  65 #define   S6_I2S_MEM_32BIT      0x008000
  66 #define   S6_I2S_MEM_MASK       0x008000
  67 #define   S6_I2S_CHANNELS_SHIFT 16
  68 #define   S6_I2S_CHANNELS_MASK  0x030000
  69 #define   S6_I2S_SCK_IN         0x000000
  70 #define   S6_I2S_SCK_OUT        0x040000
  71 #define   S6_I2S_SCK_DIR        0x040000
  72 #define   S6_I2S_WS_IN          0x000000
  73 #define   S6_I2S_WS_OUT         0x080000
  74 #define   S6_I2S_WS_DIR         0x080000
  75 #define   S6_I2S_LEFT_FIRST     0x000000
  76 #define   S6_I2S_RIGHT_FIRST    0x100000
  77 #define   S6_I2S_FIRST          0x100000
  78 #define   S6_I2S_CUR_SCK        0x200000
  79 #define   S6_I2S_CUR_WS         0x400000
  80 #define S6_I2S_ENABLE(c)        (0x48 + 0x10 * (c))
  81 #define   S6_I2S_DISABLE_IF     0x02
  82 #define   S6_I2S_ENABLE_IF      0x03
  83 #define   S6_I2S_IS_BUSY        0x04
  84 #define   S6_I2S_DMA_ACTIVE     0x08
  85 #define   S6_I2S_IS_ENABLED     0x10
  86
  87 #define S6_I2S_NUM_LINES        4
  88
  89 #define S6_I2S_SIF_PORT0        0x0000000
  90 #define S6_I2S_SIF_PORT1        0x0000080 /* docs say 0x0000010 */
  91
  92 static inline void s6_i2s_write_reg(struct s6000_i2s_dev *dev, int reg, u32 val)
  93 {
  94         writel(val, dev->scbbase + reg);
  95 }
  96
  97 static inline u32 s6_i2s_read_reg(struct s6000_i2s_dev *dev, int reg)
  98 {
  99         return readl(dev->scbbase + reg);
 100 }
 101
 102 static inline void s6_i2s_mod_reg(struct s6000_i2s_dev *dev, int reg,
 103                                   u32 mask, u32 val)
 104 {
 105         val ^= s6_i2s_read_reg(dev, reg) & ~mask;
 106         s6_i2s_write_reg(dev, reg, val);
 107 }
 108
 109 static void s6000_i2s_start_channel(struct s6000_i2s_dev *dev, int channel)
 110 {
 111         int i, j, cur, prev;
 112
 113         /*
 114          * Wait for WCLK to toggle 5 times before enabling the channel
 115          * s6000 Family Datasheet 3.6.4:
 116          *   "At least two cycles of WS must occur between commands
 117          *    to disable or enable the interface"
 118          */
 119         j = 0;
 120         prev = ~S6_I2S_CUR_WS;
 121         for (i = 1000000; --i && j < 6; ) {
 122                 cur = s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(channel))
 123                        & S6_I2S_CUR_WS;
 124                 if (prev != cur) {
 125                         prev = cur;
 126                         j++;
 127                 }
 128         }
 129         if (j < 6)
 130                 printk(KERN_WARNING "s6000-i2s: timeout waiting for WCLK\n");
 131
 132         s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_ENABLE_IF);
 133 }
 134
 135 static void s6000_i2s_stop_channel(struct s6000_i2s_dev *dev, int channel)
 136 {
 137         s6_i2s_write_reg(dev, S6_I2S_ENABLE(channel), S6_I2S_DISABLE_IF);
 138 }
 139
 140 static void s6000_i2s_start(struct snd_pcm_substream *substream)
 141 {
 142         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 143         struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 144         int channel;
 145
 146         channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 147                         dev->channel_out : dev->channel_in;
 148
 149         s6000_i2s_start_channel(dev, channel);
 150 }
 151
 152 static void s6000_i2s_stop(struct snd_pcm_substream *substream)
 153 {
 154         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 155         struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 156         int channel;
 157
 158         channel = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
 159                         dev->channel_out : dev->channel_in;
 160
 161         s6000_i2s_stop_channel(dev, channel);
 162 }
 163
 164 static int s6000_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
 165                              int after)
 166 {
 167         switch (cmd) {
 168         case SNDRV_PCM_TRIGGER_START:
 169         case SNDRV_PCM_TRIGGER_RESUME:
 170         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 171                 if ((substream->stream == SNDRV_PCM_STREAM_CAPTURE) ^ !after)
 172                         s6000_i2s_start(substream);
 173                 break;
 174         case SNDRV_PCM_TRIGGER_STOP:
 175         case SNDRV_PCM_TRIGGER_SUSPEND:
 176         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 177                 if (!after)
 178                         s6000_i2s_stop(substream);
 179         }
 180         return 0;
 181 }
 182
 183 static unsigned int s6000_i2s_int_sources(struct s6000_i2s_dev *dev)
 184 {
 185         unsigned int pending;
 186         pending = s6_i2s_read_reg(dev, S6_I2S_INTERRUPT_RAW);
 187         pending &= S6_I2S_INT_ALIGNMENT |
 188                    S6_I2S_INT_UNDERRUN |
 189                    S6_I2S_INT_OVERRUN;
 190         s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR, pending);
 191
 192         return pending;
 193 }
 194
 195 static unsigned int s6000_i2s_check_xrun(struct snd_soc_dai *cpu_dai)
 196 {
 197         struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
 198         unsigned int errors;
 199         unsigned int ret;
 200
 201         errors = s6000_i2s_int_sources(dev);
 202         if (likely(!errors))
 203                 return 0;
 204
 205         ret = 0;
 206         if (errors & S6_I2S_INT_ALIGNMENT)
 207                 printk(KERN_ERR "s6000-i2s: WCLK misaligned\n");
 208         if (errors & S6_I2S_INT_UNDERRUN)
 209                 ret |= 1 << SNDRV_PCM_STREAM_PLAYBACK;
 210         if (errors & S6_I2S_INT_OVERRUN)
 211                 ret |= 1 << SNDRV_PCM_STREAM_CAPTURE;
 212         return ret;
 213 }
 214
 215 static void s6000_i2s_wait_disabled(struct s6000_i2s_dev *dev)
 216 {
 217         int channel;
 218         int n = 50;
 219         for (channel = 0; channel < 2; channel++) {
 220                 while (--n >= 0) {
 221                         int v = s6_i2s_read_reg(dev, S6_I2S_ENABLE(channel));
 222                         if ((v & S6_I2S_IS_ENABLED)
 223                             || !(v & (S6_I2S_DMA_ACTIVE | S6_I2S_IS_BUSY)))
 224                                 break;
 225                         udelay(20);
 226                 }
 227         }
 228         if (n < 0)
 229                 printk(KERN_WARNING "s6000-i2s: timeout disabling interfaces");
 230 }
 231
 232 static int s6000_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
 233                                    unsigned int fmt)
 234 {
 235         struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
 236         u32 w;
 237
 238         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 239         case SND_SOC_DAIFMT_CBM_CFM:
 240                 w = S6_I2S_SCK_IN | S6_I2S_WS_IN;
 241                 break;
 242         case SND_SOC_DAIFMT_CBS_CFM:
 243                 w = S6_I2S_SCK_OUT | S6_I2S_WS_IN;
 244                 break;
 245         case SND_SOC_DAIFMT_CBM_CFS:
 246                 w = S6_I2S_SCK_IN | S6_I2S_WS_OUT;
 247                 break;
 248         case SND_SOC_DAIFMT_CBS_CFS:
 249                 w = S6_I2S_SCK_OUT | S6_I2S_WS_OUT;
 250                 break;
 251         default:
 252                 return -EINVAL;
 253         }
 254
 255         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 256         case SND_SOC_DAIFMT_NB_NF:
 257                 w |= S6_I2S_LEFT_FIRST;
 258                 break;
 259         case SND_SOC_DAIFMT_NB_IF:
 260                 w |= S6_I2S_RIGHT_FIRST;
 261                 break;
 262         default:
 263                 return -EINVAL;
 264         }
 265
 266         s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(0),
 267                        S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
 268         s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(1),
 269                        S6_I2S_FIRST | S6_I2S_WS_DIR | S6_I2S_SCK_DIR, w);
 270
 271         return 0;
 272 }
 273
 274 static int s6000_i2s_set_clkdiv(struct snd_soc_dai *dai, int div_id, int div)
 275 {
 276         struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 277
 278         if (!div || (div & 1) || div > (S6_I2S_DIV_MASK + 1) * 2)
 279                 return -EINVAL;
 280
 281         s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(div_id),
 282                        S6_I2S_DIV_MASK, div / 2 - 1);
 283         return 0;
 284 }
 285
 286 static int s6000_i2s_hw_params(struct snd_pcm_substream *substream,
 287                                struct snd_pcm_hw_params *params,
 288                                struct snd_soc_dai *dai)
 289 {
 290         struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 291         int interf;
 292         u32 w = 0;
 293
 294         if (dev->wide)
 295                 interf = 0;
 296         else {
 297                 w |= (((params_channels(params) - 2) / 2)
 298                       << S6_I2S_CHANNELS_SHIFT) & S6_I2S_CHANNELS_MASK;
 299                 interf = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 300                                 ? dev->channel_out : dev->channel_in;
 301         }
 302
 303         switch (params_format(params)) {
 304         case SNDRV_PCM_FORMAT_S16_LE:
 305                 w |= S6_I2S_16BIT | S6_I2S_MEM_16BIT;
 306                 break;
 307         case SNDRV_PCM_FORMAT_S32_LE:
 308                 w |= S6_I2S_32BIT | S6_I2S_MEM_32BIT;
 309                 break;
 310         default:
 311                 printk(KERN_WARNING "s6000-i2s: unsupported PCM format %x\n",
 312                        params_format(params));
 313                 return -EINVAL;
 314         }
 315
 316         if (s6_i2s_read_reg(dev, S6_I2S_INTERFACE_CFG(interf))
 317              & S6_I2S_IS_ENABLED) {
 318                 printk(KERN_ERR "s6000-i2s: interface already enabled\n");
 319                 return -EBUSY;
 320         }
 321
 322         s6_i2s_mod_reg(dev, S6_I2S_INTERFACE_CFG(interf),
 323                        S6_I2S_CHANNELS_MASK|S6_I2S_MEM_MASK|S6_I2S_BITS_MASK,
 324                        w);
 325
 326         return 0;
 327 }
 328
 329 static int s6000_i2s_dai_probe(struct snd_soc_dai *dai)
 330 {
 331         struct s6000_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
 332         struct s6000_snd_platform_data *pdata = dai->dev->platform_data;
 333
 334         if (!pdata)
 335                 return -EINVAL;
 336
 337         dai->capture_dma_data = &dev->dma_params;
 338         dai->playback_dma_data = &dev->dma_params;
 339
 340         dev->wide = pdata->wide;
 341         dev->channel_in = pdata->channel_in;
 342         dev->channel_out = pdata->channel_out;
 343         dev->lines_in = pdata->lines_in;
 344         dev->lines_out = pdata->lines_out;
 345
 346         s6_i2s_write_reg(dev, S6_I2S_MODE,
 347                          dev->wide ? S6_I2S_WIDE : S6_I2S_DUAL);
 348
 349         if (dev->wide) {
 350                 int i;
 351
 352                 if (dev->lines_in + dev->lines_out > S6_I2S_NUM_LINES)
 353                         return -EINVAL;
 354
 355                 dev->channel_in = 0;
 356                 dev->channel_out = 1;
 357                 dai->driver->capture.channels_min = 2 * dev->lines_in;
 358                 dai->driver->capture.channels_max = dai->driver->capture.channels_min;
 359                 dai->driver->playback.channels_min = 2 * dev->lines_out;
 360                 dai->driver->playback.channels_max = dai->driver->playback.channels_min;
 361
 362                 for (i = 0; i < dev->lines_out; i++)
 363                         s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_OUT);
 364
 365                 for (; i < S6_I2S_NUM_LINES - dev->lines_in; i++)
 366                         s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i),
 367                                          S6_I2S_UNUSED);
 368
 369                 for (; i < S6_I2S_NUM_LINES; i++)
 370                         s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(i), S6_I2S_IN);
 371         } else {
 372                 unsigned int cfg[2] = {S6_I2S_UNUSED, S6_I2S_UNUSED};
 373
 374                 if (dev->lines_in > 1 || dev->lines_out > 1)
 375                         return -EINVAL;
 376
 377                 dai->driver->capture.channels_min = 2 * dev->lines_in;
 378                 dai->driver->capture.channels_max = 8 * dev->lines_in;
 379                 dai->driver->playback.channels_min = 2 * dev->lines_out;
 380                 dai->driver->playback.channels_max = 8 * dev->lines_out;
 381
 382                 if (dev->lines_in)
 383                         cfg[dev->channel_in] = S6_I2S_IN;
 384                 if (dev->lines_out)
 385                         cfg[dev->channel_out] = S6_I2S_OUT;
 386
 387                 s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(0), cfg[0]);
 388                 s6_i2s_write_reg(dev, S6_I2S_DATA_CFG(1), cfg[1]);
 389         }
 390
 391         if (dev->lines_out) {
 392                 if (dev->lines_in) {
 393                         if (!dev->dma_params.dma_out)
 394                                 return -ENODEV;
 395                 } else {
 396                         dev->dma_params.dma_out = dev->dma_params.dma_in;
 397                         dev->dma_params.dma_in = 0;
 398                 }
 399         }
 400         dev->dma_params.sif_in = dev->sifbase + (dev->channel_in ?
 401                                         S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
 402         dev->dma_params.sif_out = dev->sifbase + (dev->channel_out ?
 403                                         S6_I2S_SIF_PORT1 : S6_I2S_SIF_PORT0);
 404         dev->dma_params.same_rate = pdata->same_rate | pdata->wide;
 405         return 0;
 406 }
 407
 408 #define S6000_I2S_RATES (SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_5512 | \
 409                          SNDRV_PCM_RATE_8000_192000)
 410 #define S6000_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE)
 411
 412 static struct snd_soc_dai_ops s6000_i2s_dai_ops = {
 413         .set_fmt = s6000_i2s_set_dai_fmt,
 414         .set_clkdiv = s6000_i2s_set_clkdiv,
 415         .hw_params = s6000_i2s_hw_params,
 416 };
 417
 418 static struct snd_soc_dai_driver s6000_i2s_dai = {
 419         .probe = s6000_i2s_dai_probe,
 420         .playback = {
 421                 .channels_min = 2,
 422                 .channels_max = 8,
 423                 .formats = S6000_I2S_FORMATS,
 424                 .rates = S6000_I2S_RATES,
 425                 .rate_min = 0,
 426                 .rate_max = 1562500,
 427         },
 428         .capture = {
 429                 .channels_min = 2,
 430                 .channels_max = 8,
 431                 .formats = S6000_I2S_FORMATS,
 432                 .rates = S6000_I2S_RATES,
 433                 .rate_min = 0,
 434                 .rate_max = 1562500,
 435         },
 436         .ops = &s6000_i2s_dai_ops,
 437 }
 438
 439 static int __devinit s6000_i2s_probe(struct platform_device *pdev)
 440 {
 441         struct s6000_i2s_dev *dev;
 442         struct resource *scbmem, *sifmem, *region, *dma1, *dma2;
 443         u8 __iomem *mmio;
 444         int ret;
 445
 446         scbmem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 447         if (!scbmem) {
 448                 dev_err(&pdev->dev, "no mem resource?\n");
 449                 ret = -ENODEV;
 450                 goto err_release_none;
 451         }
 452
 453         region = request_mem_region(scbmem->start, resource_size(scbmem),
 454                                                                 pdev->name);
 455         if (!region) {
 456                 dev_err(&pdev->dev, "I2S SCB region already claimed\n");
 457                 ret = -EBUSY;
 458                 goto err_release_none;
 459         }
 460
 461         mmio = ioremap(scbmem->start, resource_size(scbmem));
 462         if (!mmio) {
 463                 dev_err(&pdev->dev, "can't ioremap SCB region\n");
 464                 ret = -ENOMEM;
 465                 goto err_release_scb;
 466         }
 467
 468         sifmem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 469         if (!sifmem) {
 470                 dev_err(&pdev->dev, "no second mem resource?\n");
 471                 ret = -ENODEV;
 472                 goto err_release_map;
 473         }
 474
 475         region = request_mem_region(sifmem->start, resource_size(sifmem),
 476                                                                 pdev->name);
 477         if (!region) {
 478                 dev_err(&pdev->dev, "I2S SIF region already claimed\n");
 479                 ret = -EBUSY;
 480                 goto err_release_map;
 481         }
 482
 483         dma1 = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 484         if (!dma1) {
 485                 dev_err(&pdev->dev, "no dma resource?\n");
 486                 ret = -ENODEV;
 487                 goto err_release_sif;
 488         }
 489
 490         region = request_mem_region(dma1->start, resource_size(dma1),
 491                                                                 pdev->name);
 492         if (!region) {
 493                 dev_err(&pdev->dev, "I2S DMA region already claimed\n");
 494                 ret = -EBUSY;
 495                 goto err_release_sif;
 496         }
 497
 498         dma2 = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 499         if (dma2) {
 500                 region = request_mem_region(dma2->start, resource_size(dma2),
 501                                                                 pdev->name);
 502                 if (!region) {
 503                         dev_err(&pdev->dev,
 504                                 "I2S DMA region already claimed\n");
 505                         ret = -EBUSY;
 506                         goto err_release_dma1;
 507                 }
 508         }
 509
 510         dev = kzalloc(sizeof(struct s6000_i2s_dev), GFP_KERNEL);
 511         if (!dev) {
 512                 ret = -ENOMEM;
 513                 goto err_release_dma2;
 514         }
 515         dev_set_drvdata(&pdev->dev, dev);
 516
 517         dev->sifbase = sifmem->start;
 518         dev->scbbase = mmio;
 519
 520         s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
 521         s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_CLEAR,
 522                          S6_I2S_INT_ALIGNMENT |
 523                          S6_I2S_INT_UNDERRUN |
 524                          S6_I2S_INT_OVERRUN);
 525
 526         s6000_i2s_stop_channel(dev, 0);
 527         s6000_i2s_stop_channel(dev, 1);
 528         s6000_i2s_wait_disabled(dev);
 529
 530         dev->dma_params.check_xrun = s6000_i2s_check_xrun;
 531         dev->dma_params.trigger = s6000_i2s_trigger;
 532         dev->dma_params.dma_in = dma1->start;
 533         dev->dma_params.dma_out = dma2 ? dma2->start : 0;
 534         dev->dma_params.irq = platform_get_irq(pdev, 0);
 535         if (dev->dma_params.irq < 0) {
 536                 dev_err(&pdev->dev, "no irq resource?\n");
 537                 ret = -ENODEV;
 538                 goto err_release_dev;
 539         }
 540
 541         s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE,
 542                          S6_I2S_INT_ALIGNMENT |
 543                          S6_I2S_INT_UNDERRUN |
 544                          S6_I2S_INT_OVERRUN);
 545
 546         ret = snd_soc_register_dai(&pdev->dev, &s6000_i2s_dai);
 547         if (ret)
 548                 goto err_release_dev;
 549
 550         return 0;
 551
 552 err_release_dev:
 553         kfree(dev);
 554 err_release_dma2:
 555         if (dma2)
 556                 release_mem_region(dma2->start, resource_size(dma2));
 557 err_release_dma1:
 558         release_mem_region(dma1->start, resource_size(dma1));
 559 err_release_sif:
 560         release_mem_region(sifmem->start, resource_size(sifmem));
 561 err_release_map:
 562         iounmap(mmio);
 563 err_release_scb:
 564         release_mem_region(scbmem->start, resource_size(scbmem));
 565 err_release_none:
 566         return ret;
 567 }
 568
 569 static void __devexit s6000_i2s_remove(struct platform_device *pdev)
 570 {
 571         struct s6000_i2s_dev *dev = dev_get_drvdata(&pdev->dev);
 572         struct resource *region;
 573         void __iomem *mmio = dev->scbbase;
 574
 575         snd_soc_unregister_dai(&pdev->dev);
 576
 577         s6000_i2s_stop_channel(dev, 0);
 578         s6000_i2s_stop_channel(dev, 1);
 579
 580         s6_i2s_write_reg(dev, S6_I2S_INTERRUPT_ENABLE, 0);
 581         kfree(dev);
 582
 583         region = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 584         release_mem_region(region->start, resource_size(region));
 585
 586         region = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 587         if (region)
 588                 release_mem_region(region->start, resource_size(region));
 589
 590         region = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 591         release_mem_region(region->start, resource_size(region));
 592
 593         iounmap(mmio);
 594         region = platform_get_resource(pdev, IORESOURCE_IO, 0);
 595         release_mem_region(region->start, resource_size(region));
 596 }
 597
 598 static struct platform_driver s6000_i2s_driver = {
 599         .probe  = s6000_i2s_probe,
 600         .remove = __devexit_p(s6000_i2s_remove),
 601         .driver = {
 602                 .name   = "s6000-i2s",
 603                 .owner  = THIS_MODULE,
 604         },
 605 };
 606
 607 static int __init s6000_i2s_init(void)
 608 {
 609         return platform_driver_register(&s6000_i2s_driver);
 610 }
 611 module_init(s6000_i2s_init);
 612
 613 static void __exit s6000_i2s_exit(void)
 614 {
 615         platform_driver_unregister(&s6000_i2s_driver);
 616 }
 617 module_exit(s6000_i2s_exit);
 618
 619 MODULE_AUTHOR("Daniel Gloeckner");
 620 MODULE_DESCRIPTION("Stretch s6000 family I2S SoC Interface");
 621 MODULE_LICENSE("GPL");