sound/soc/samsung/pcm.c

   1 /* sound/soc/samsung/pcm.c
   2  *
   3  * ALSA SoC Audio Layer - S3C PCM-Controller driver
   4  *
   5  * Copyright (c) 2009 Samsung Electronics Co. Ltd
   6  * Author: Jaswinder Singh <jassisinghbrar@gmail.com>
   7  * based upon I2S drivers by Ben Dooks.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/io.h>
  16 #include <linux/module.h>
  17 #include <linux/pm_runtime.h>
  18
  19 #include <sound/soc.h>
  20 #include <sound/pcm_params.h>
  21
  22 #include <linux/platform_data/asoc-s3c.h>
  23
  24 #include "dma.h"
  25 #include "pcm.h"
  26
  27 /*Register Offsets */
  28 #define S3C_PCM_CTL             0x00
  29 #define S3C_PCM_CLKCTL          0x04
  30 #define S3C_PCM_TXFIFO          0x08
  31 #define S3C_PCM_RXFIFO          0x0C
  32 #define S3C_PCM_IRQCTL          0x10
  33 #define S3C_PCM_IRQSTAT         0x14
  34 #define S3C_PCM_FIFOSTAT        0x18
  35 #define S3C_PCM_CLRINT          0x20
  36
  37 /* PCM_CTL Bit-Fields */
  38 #define S3C_PCM_CTL_TXDIPSTICK_MASK     0x3f
  39 #define S3C_PCM_CTL_TXDIPSTICK_SHIFT    13
  40 #define S3C_PCM_CTL_RXDIPSTICK_MASK     0x3f
  41 #define S3C_PCM_CTL_RXDIPSTICK_SHIFT    7
  42 #define S3C_PCM_CTL_TXDMA_EN            (0x1 << 6)
  43 #define S3C_PCM_CTL_RXDMA_EN            (0x1 << 5)
  44 #define S3C_PCM_CTL_TXMSB_AFTER_FSYNC   (0x1 << 4)
  45 #define S3C_PCM_CTL_RXMSB_AFTER_FSYNC   (0x1 << 3)
  46 #define S3C_PCM_CTL_TXFIFO_EN           (0x1 << 2)
  47 #define S3C_PCM_CTL_RXFIFO_EN           (0x1 << 1)
  48 #define S3C_PCM_CTL_ENABLE              (0x1 << 0)
  49
  50 /* PCM_CLKCTL Bit-Fields */
  51 #define S3C_PCM_CLKCTL_SERCLK_EN        (0x1 << 19)
  52 #define S3C_PCM_CLKCTL_SERCLKSEL_PCLK   (0x1 << 18)
  53 #define S3C_PCM_CLKCTL_SCLKDIV_MASK     0x1ff
  54 #define S3C_PCM_CLKCTL_SYNCDIV_MASK     0x1ff
  55 #define S3C_PCM_CLKCTL_SCLKDIV_SHIFT    9
  56 #define S3C_PCM_CLKCTL_SYNCDIV_SHIFT    0
  57
  58 /* PCM_TXFIFO Bit-Fields */
  59 #define S3C_PCM_TXFIFO_DVALID   (0x1 << 16)
  60 #define S3C_PCM_TXFIFO_DATA_MSK (0xffff << 0)
  61
  62 /* PCM_RXFIFO Bit-Fields */
  63 #define S3C_PCM_RXFIFO_DVALID   (0x1 << 16)
  64 #define S3C_PCM_RXFIFO_DATA_MSK (0xffff << 0)
  65
  66 /* PCM_IRQCTL Bit-Fields */
  67 #define S3C_PCM_IRQCTL_IRQEN            (0x1 << 14)
  68 #define S3C_PCM_IRQCTL_WRDEN            (0x1 << 12)
  69 #define S3C_PCM_IRQCTL_TXEMPTYEN        (0x1 << 11)
  70 #define S3C_PCM_IRQCTL_TXALMSTEMPTYEN   (0x1 << 10)
  71 #define S3C_PCM_IRQCTL_TXFULLEN         (0x1 << 9)
  72 #define S3C_PCM_IRQCTL_TXALMSTFULLEN    (0x1 << 8)
  73 #define S3C_PCM_IRQCTL_TXSTARVEN        (0x1 << 7)
  74 #define S3C_PCM_IRQCTL_TXERROVRFLEN     (0x1 << 6)
  75 #define S3C_PCM_IRQCTL_RXEMPTEN         (0x1 << 5)
  76 #define S3C_PCM_IRQCTL_RXALMSTEMPTEN    (0x1 << 4)
  77 #define S3C_PCM_IRQCTL_RXFULLEN         (0x1 << 3)
  78 #define S3C_PCM_IRQCTL_RXALMSTFULLEN    (0x1 << 2)
  79 #define S3C_PCM_IRQCTL_RXSTARVEN        (0x1 << 1)
  80 #define S3C_PCM_IRQCTL_RXERROVRFLEN     (0x1 << 0)
  81
  82 /* PCM_IRQSTAT Bit-Fields */
  83 #define S3C_PCM_IRQSTAT_IRQPND          (0x1 << 13)
  84 #define S3C_PCM_IRQSTAT_WRD_XFER        (0x1 << 12)
  85 #define S3C_PCM_IRQSTAT_TXEMPTY         (0x1 << 11)
  86 #define S3C_PCM_IRQSTAT_TXALMSTEMPTY    (0x1 << 10)
  87 #define S3C_PCM_IRQSTAT_TXFULL          (0x1 << 9)
  88 #define S3C_PCM_IRQSTAT_TXALMSTFULL     (0x1 << 8)
  89 #define S3C_PCM_IRQSTAT_TXSTARV         (0x1 << 7)
  90 #define S3C_PCM_IRQSTAT_TXERROVRFL      (0x1 << 6)
  91 #define S3C_PCM_IRQSTAT_RXEMPT          (0x1 << 5)
  92 #define S3C_PCM_IRQSTAT_RXALMSTEMPT     (0x1 << 4)
  93 #define S3C_PCM_IRQSTAT_RXFULL          (0x1 << 3)
  94 #define S3C_PCM_IRQSTAT_RXALMSTFULL     (0x1 << 2)
  95 #define S3C_PCM_IRQSTAT_RXSTARV         (0x1 << 1)
  96 #define S3C_PCM_IRQSTAT_RXERROVRFL      (0x1 << 0)
  97
  98 /* PCM_FIFOSTAT Bit-Fields */
  99 #define S3C_PCM_FIFOSTAT_TXCNT_MSK              (0x3f << 14)
 100 #define S3C_PCM_FIFOSTAT_TXFIFOEMPTY            (0x1 << 13)
 101 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTEMPTY       (0x1 << 12)
 102 #define S3C_PCM_FIFOSTAT_TXFIFOFULL             (0x1 << 11)
 103 #define S3C_PCM_FIFOSTAT_TXFIFOALMSTFULL        (0x1 << 10)
 104 #define S3C_PCM_FIFOSTAT_RXCNT_MSK              (0x3f << 4)
 105 #define S3C_PCM_FIFOSTAT_RXFIFOEMPTY            (0x1 << 3)
 106 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTEMPTY       (0x1 << 2)
 107 #define S3C_PCM_FIFOSTAT_RXFIFOFULL             (0x1 << 1)
 108 #define S3C_PCM_FIFOSTAT_RXFIFOALMSTFULL        (0x1 << 0)
 109
 110 /**
 111  * struct s3c_pcm_info - S3C PCM Controller information
 112  * @dev: The parent device passed to use from the probe.
 113  * @regs: The pointer to the device register block.
 114  * @dma_playback: DMA information for playback channel.
 115  * @dma_capture: DMA information for capture channel.
 116  */
 117 struct s3c_pcm_info {
 118         spinlock_t lock;
 119         struct device   *dev;
 120         void __iomem    *regs;
 121
 122         unsigned int sclk_per_fs;
 123
 124         /* Whether to keep PCMSCLK enabled even when idle(no active xfer) */
 125         unsigned int idleclk;
 126
 127         struct clk      *pclk;
 128         struct clk      *cclk;
 129
 130         struct snd_dmaengine_dai_dma_data *dma_playback;
 131         struct snd_dmaengine_dai_dma_data *dma_capture;
 132 };
 133
 134 static struct snd_dmaengine_dai_dma_data s3c_pcm_stereo_out[] = {
 135         [0] = {
 136                 .addr_width     = 4,
 137         },
 138         [1] = {
 139                 .addr_width     = 4,
 140         },
 141 };
 142
 143 static struct snd_dmaengine_dai_dma_data s3c_pcm_stereo_in[] = {
 144         [0] = {
 145                 .addr_width     = 4,
 146         },
 147         [1] = {
 148                 .addr_width     = 4,
 149         },
 150 };
 151
 152 static struct s3c_pcm_info s3c_pcm[2];
 153
 154 static void s3c_pcm_snd_txctrl(struct s3c_pcm_info *pcm, int on)
 155 {
 156         void __iomem *regs = pcm->regs;
 157         u32 ctl, clkctl;
 158
 159         clkctl = readl(regs + S3C_PCM_CLKCTL);
 160         ctl = readl(regs + S3C_PCM_CTL);
 161         ctl &= ~(S3C_PCM_CTL_TXDIPSTICK_MASK
 162                          << S3C_PCM_CTL_TXDIPSTICK_SHIFT);
 163
 164         if (on) {
 165                 ctl |= S3C_PCM_CTL_TXDMA_EN;
 166                 ctl |= S3C_PCM_CTL_TXFIFO_EN;
 167                 ctl |= S3C_PCM_CTL_ENABLE;
 168                 ctl |= (0x4<<S3C_PCM_CTL_TXDIPSTICK_SHIFT);
 169                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 170         } else {
 171                 ctl &= ~S3C_PCM_CTL_TXDMA_EN;
 172                 ctl &= ~S3C_PCM_CTL_TXFIFO_EN;
 173
 174                 if (!(ctl & S3C_PCM_CTL_RXFIFO_EN)) {
 175                         ctl &= ~S3C_PCM_CTL_ENABLE;
 176                         if (!pcm->idleclk)
 177                                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 178                 }
 179         }
 180
 181         writel(clkctl, regs + S3C_PCM_CLKCTL);
 182         writel(ctl, regs + S3C_PCM_CTL);
 183 }
 184
 185 static void s3c_pcm_snd_rxctrl(struct s3c_pcm_info *pcm, int on)
 186 {
 187         void __iomem *regs = pcm->regs;
 188         u32 ctl, clkctl;
 189
 190         ctl = readl(regs + S3C_PCM_CTL);
 191         clkctl = readl(regs + S3C_PCM_CLKCTL);
 192         ctl &= ~(S3C_PCM_CTL_RXDIPSTICK_MASK
 193                          << S3C_PCM_CTL_RXDIPSTICK_SHIFT);
 194
 195         if (on) {
 196                 ctl |= S3C_PCM_CTL_RXDMA_EN;
 197                 ctl |= S3C_PCM_CTL_RXFIFO_EN;
 198                 ctl |= S3C_PCM_CTL_ENABLE;
 199                 ctl |= (0x20<<S3C_PCM_CTL_RXDIPSTICK_SHIFT);
 200                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 201         } else {
 202                 ctl &= ~S3C_PCM_CTL_RXDMA_EN;
 203                 ctl &= ~S3C_PCM_CTL_RXFIFO_EN;
 204
 205                 if (!(ctl & S3C_PCM_CTL_TXFIFO_EN)) {
 206                         ctl &= ~S3C_PCM_CTL_ENABLE;
 207                         if (!pcm->idleclk)
 208                                 clkctl |= S3C_PCM_CLKCTL_SERCLK_EN;
 209                 }
 210         }
 211
 212         writel(clkctl, regs + S3C_PCM_CLKCTL);
 213         writel(ctl, regs + S3C_PCM_CTL);
 214 }
 215
 216 static int s3c_pcm_trigger(struct snd_pcm_substream *substream, int cmd,
 217                                struct snd_soc_dai *dai)
 218 {
 219         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 220         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 221         unsigned long flags;
 222
 223         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 224
 225         switch (cmd) {
 226         case SNDRV_PCM_TRIGGER_START:
 227         case SNDRV_PCM_TRIGGER_RESUME:
 228         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 229                 spin_lock_irqsave(&pcm->lock, flags);
 230
 231                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 232                         s3c_pcm_snd_rxctrl(pcm, 1);
 233                 else
 234                         s3c_pcm_snd_txctrl(pcm, 1);
 235
 236                 spin_unlock_irqrestore(&pcm->lock, flags);
 237                 break;
 238
 239         case SNDRV_PCM_TRIGGER_STOP:
 240         case SNDRV_PCM_TRIGGER_SUSPEND:
 241         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 242                 spin_lock_irqsave(&pcm->lock, flags);
 243
 244                 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 245                         s3c_pcm_snd_rxctrl(pcm, 0);
 246                 else
 247                         s3c_pcm_snd_txctrl(pcm, 0);
 248
 249                 spin_unlock_irqrestore(&pcm->lock, flags);
 250                 break;
 251
 252         default:
 253                 return -EINVAL;
 254         }
 255
 256         return 0;
 257 }
 258
 259 static int s3c_pcm_hw_params(struct snd_pcm_substream *substream,
 260                                  struct snd_pcm_hw_params *params,
 261                                  struct snd_soc_dai *socdai)
 262 {
 263         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 264         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(rtd->cpu_dai);
 265         void __iomem *regs = pcm->regs;
 266         struct clk *clk;
 267         int sclk_div, sync_div;
 268         unsigned long flags;
 269         u32 clkctl;
 270
 271         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 272
 273         /* Strictly check for sample size */
 274         switch (params_width(params)) {
 275         case 16:
 276                 break;
 277         default:
 278                 return -EINVAL;
 279         }
 280
 281         spin_lock_irqsave(&pcm->lock, flags);
 282
 283         /* Get hold of the PCMSOURCE_CLK */
 284         clkctl = readl(regs + S3C_PCM_CLKCTL);
 285         if (clkctl & S3C_PCM_CLKCTL_SERCLKSEL_PCLK)
 286                 clk = pcm->pclk;
 287         else
 288                 clk = pcm->cclk;
 289
 290         /* Set the SCLK divider */
 291         sclk_div = clk_get_rate(clk) / pcm->sclk_per_fs /
 292                                         params_rate(params) / 2 - 1;
 293
 294         clkctl &= ~(S3C_PCM_CLKCTL_SCLKDIV_MASK
 295                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 296         clkctl |= ((sclk_div & S3C_PCM_CLKCTL_SCLKDIV_MASK)
 297                         << S3C_PCM_CLKCTL_SCLKDIV_SHIFT);
 298
 299         /* Set the SYNC divider */
 300         sync_div = pcm->sclk_per_fs - 1;
 301
 302         clkctl &= ~(S3C_PCM_CLKCTL_SYNCDIV_MASK
 303                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 304         clkctl |= ((sync_div & S3C_PCM_CLKCTL_SYNCDIV_MASK)
 305                                 << S3C_PCM_CLKCTL_SYNCDIV_SHIFT);
 306
 307         writel(clkctl, regs + S3C_PCM_CLKCTL);
 308
 309         spin_unlock_irqrestore(&pcm->lock, flags);
 310
 311         dev_dbg(pcm->dev, "PCMSOURCE_CLK-%lu SCLK=%ufs SCLK_DIV=%d SYNC_DIV=%d\n",
 312                                 clk_get_rate(clk), pcm->sclk_per_fs,
 313                                 sclk_div, sync_div);
 314
 315         return 0;
 316 }
 317
 318 static int s3c_pcm_set_fmt(struct snd_soc_dai *cpu_dai,
 319                                unsigned int fmt)
 320 {
 321         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
 322         void __iomem *regs = pcm->regs;
 323         unsigned long flags;
 324         int ret = 0;
 325         u32 ctl;
 326
 327         dev_dbg(pcm->dev, "Entered %s\n", __func__);
 328
 329         spin_lock_irqsave(&pcm->lock, flags);
 330
 331         ctl = readl(regs + S3C_PCM_CTL);
 332
 333         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 334         case SND_SOC_DAIFMT_IB_NF:
 335                 /* Nothing to do, IB_NF by default */
 336                 break;
 337         default:
 338                 dev_err(pcm->dev, "Unsupported clock inversion!\n");
 339                 ret = -EINVAL;
 340                 goto exit;
 341         }
 342
 343         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 344         case SND_SOC_DAIFMT_CBS_CFS:
 345                 /* Nothing to do, Master by default */
 346                 break;
 347         default:
 348                 dev_err(pcm->dev, "Unsupported master/slave format!\n");
 349                 ret = -EINVAL;
 350                 goto exit;
 351         }
 352
 353         switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
 354         case SND_SOC_DAIFMT_CONT:
 355                 pcm->idleclk = 1;
 356                 break;
 357         case SND_SOC_DAIFMT_GATED:
 358                 pcm->idleclk = 0;
 359                 break;
 360         default:
 361                 dev_err(pcm->dev, "Invalid Clock gating request!\n");
 362                 ret = -EINVAL;
 363                 goto exit;
 364         }
 365
 366         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 367         case SND_SOC_DAIFMT_DSP_A:
 368                 ctl |= S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 369                 ctl |= S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 370                 break;
 371         case SND_SOC_DAIFMT_DSP_B:
 372                 ctl &= ~S3C_PCM_CTL_TXMSB_AFTER_FSYNC;
 373                 ctl &= ~S3C_PCM_CTL_RXMSB_AFTER_FSYNC;
 374                 break;
 375         default:
 376                 dev_err(pcm->dev, "Unsupported data format!\n");
 377                 ret = -EINVAL;
 378                 goto exit;
 379         }
 380
 381         writel(ctl, regs + S3C_PCM_CTL);
 382
 383 exit:
 384         spin_unlock_irqrestore(&pcm->lock, flags);
 385
 386         return ret;
 387 }
 388
 389 static int s3c_pcm_set_clkdiv(struct snd_soc_dai *cpu_dai,
 390                                                 int div_id, int div)
 391 {
 392         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
 393
 394         switch (div_id) {
 395         case S3C_PCM_SCLK_PER_FS:
 396                 pcm->sclk_per_fs = div;
 397                 break;
 398
 399         default:
 400                 return -EINVAL;
 401         }
 402
 403         return 0;
 404 }
 405
 406 static int s3c_pcm_set_sysclk(struct snd_soc_dai *cpu_dai,
 407                                   int clk_id, unsigned int freq, int dir)
 408 {
 409         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(cpu_dai);
 410         void __iomem *regs = pcm->regs;
 411         u32 clkctl = readl(regs + S3C_PCM_CLKCTL);
 412
 413         switch (clk_id) {
 414         case S3C_PCM_CLKSRC_PCLK:
 415                 clkctl |= S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 416                 break;
 417
 418         case S3C_PCM_CLKSRC_MUX:
 419                 clkctl &= ~S3C_PCM_CLKCTL_SERCLKSEL_PCLK;
 420
 421                 if (clk_get_rate(pcm->cclk) != freq)
 422                         clk_set_rate(pcm->cclk, freq);
 423
 424                 break;
 425
 426         default:
 427                 return -EINVAL;
 428         }
 429
 430         writel(clkctl, regs + S3C_PCM_CLKCTL);
 431
 432         return 0;
 433 }
 434
 435 static const struct snd_soc_dai_ops s3c_pcm_dai_ops = {
 436         .set_sysclk     = s3c_pcm_set_sysclk,
 437         .set_clkdiv     = s3c_pcm_set_clkdiv,
 438         .trigger        = s3c_pcm_trigger,
 439         .hw_params      = s3c_pcm_hw_params,
 440         .set_fmt        = s3c_pcm_set_fmt,
 441 };
 442
 443 static int s3c_pcm_dai_probe(struct snd_soc_dai *dai)
 444 {
 445         struct s3c_pcm_info *pcm = snd_soc_dai_get_drvdata(dai);
 446
 447         snd_soc_dai_init_dma_data(dai, pcm->dma_playback, pcm->dma_capture);
 448
 449         return 0;
 450 }
 451
 452 #define S3C_PCM_RATES  SNDRV_PCM_RATE_8000_96000
 453
 454 #define S3C_PCM_DAI_DECLARE                     \
 455         .symmetric_rates = 1,                                   \
 456         .probe = s3c_pcm_dai_probe,                             \
 457         .ops = &s3c_pcm_dai_ops,                                \
 458         .playback = {                                           \
 459                 .channels_min   = 2,                            \
 460                 .channels_max   = 2,                            \
 461                 .rates          = S3C_PCM_RATES,                \
 462                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 463         },                                                      \
 464         .capture = {                                            \
 465                 .channels_min   = 2,                            \
 466                 .channels_max   = 2,                            \
 467                 .rates          = S3C_PCM_RATES,                \
 468                 .formats        = SNDRV_PCM_FMTBIT_S16_LE,      \
 469         }
 470
 471 static struct snd_soc_dai_driver s3c_pcm_dai[] = {
 472         [0] = {
 473                 .name   = "samsung-pcm.0",
 474                 S3C_PCM_DAI_DECLARE,
 475         },
 476         [1] = {
 477                 .name   = "samsung-pcm.1",
 478                 S3C_PCM_DAI_DECLARE,
 479         },
 480 };
 481
 482 static const struct snd_soc_component_driver s3c_pcm_component = {
 483         .name           = "s3c-pcm",
 484 };
 485
 486 static int s3c_pcm_dev_probe(struct platform_device *pdev)
 487 {
 488         struct s3c_pcm_info *pcm;
 489         struct resource *mem_res;
 490         struct s3c_audio_pdata *pcm_pdata;
 491         dma_filter_fn filter;
 492         int ret;
 493
 494         /* Check for valid device index */
 495         if ((pdev->id < 0) || pdev->id >= ARRAY_SIZE(s3c_pcm)) {
 496                 dev_err(&pdev->dev, "id %d out of range\n", pdev->id);
 497                 return -EINVAL;
 498         }
 499
 500         pcm_pdata = pdev->dev.platform_data;
 501
 502         /* Check for availability of necessary resource */
 503         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 504         if (!mem_res) {
 505                 dev_err(&pdev->dev, "Unable to get register resource\n");
 506                 return -ENXIO;
 507         }
 508
 509         if (pcm_pdata && pcm_pdata->cfg_gpio && pcm_pdata->cfg_gpio(pdev)) {
 510                 dev_err(&pdev->dev, "Unable to configure gpio\n");
 511                 return -EINVAL;
 512         }
 513
 514         pcm = &s3c_pcm[pdev->id];
 515         pcm->dev = &pdev->dev;
 516
 517         spin_lock_init(&pcm->lock);
 518
 519         /* Default is 128fs */
 520         pcm->sclk_per_fs = 128;
 521
 522         pcm->cclk = devm_clk_get(&pdev->dev, "audio-bus");
 523         if (IS_ERR(pcm->cclk)) {
 524                 dev_err(&pdev->dev, "failed to get audio-bus\n");
 525                 ret = PTR_ERR(pcm->cclk);
 526                 goto err1;
 527         }
 528         clk_prepare_enable(pcm->cclk);
 529
 530         /* record our pcm structure for later use in the callbacks */
 531         dev_set_drvdata(&pdev->dev, pcm);
 532
 533         if (!request_mem_region(mem_res->start,
 534                                 resource_size(mem_res), "samsung-pcm")) {
 535                 dev_err(&pdev->dev, "Unable to request register region\n");
 536                 ret = -EBUSY;
 537                 goto err2;
 538         }
 539
 540         pcm->regs = ioremap(mem_res->start, 0x100);
 541         if (pcm->regs == NULL) {
 542                 dev_err(&pdev->dev, "cannot ioremap registers\n");
 543                 ret = -ENXIO;
 544                 goto err3;
 545         }
 546
 547         pcm->pclk = devm_clk_get(&pdev->dev, "pcm");
 548         if (IS_ERR(pcm->pclk)) {
 549                 dev_err(&pdev->dev, "failed to get pcm_clock\n");
 550                 ret = -ENOENT;
 551                 goto err4;
 552         }
 553         clk_prepare_enable(pcm->pclk);
 554
 555         s3c_pcm_stereo_in[pdev->id].addr = mem_res->start + S3C_PCM_RXFIFO;
 556         s3c_pcm_stereo_out[pdev->id].addr = mem_res->start + S3C_PCM_TXFIFO;
 557
 558         filter = NULL;
 559         if (pcm_pdata) {
 560                 s3c_pcm_stereo_in[pdev->id].filter_data = pcm_pdata->dma_capture;
 561                 s3c_pcm_stereo_out[pdev->id].filter_data = pcm_pdata->dma_playback;
 562                 filter = pcm_pdata->dma_filter;
 563         }
 564
 565         pcm->dma_capture = &s3c_pcm_stereo_in[pdev->id];
 566         pcm->dma_playback = &s3c_pcm_stereo_out[pdev->id];
 567
 568         pm_runtime_enable(&pdev->dev);
 569
 570         ret = devm_snd_soc_register_component(&pdev->dev, &s3c_pcm_component,
 571                                          &s3c_pcm_dai[pdev->id], 1);
 572         if (ret != 0) {
 573                 dev_err(&pdev->dev, "failed to get register DAI: %d\n", ret);
 574                 goto err5;
 575         }
 576
 577         ret = samsung_asoc_dma_platform_register(&pdev->dev, filter,
 578                                                  NULL, NULL);
 579         if (ret) {
 580                 dev_err(&pdev->dev, "failed to get register DMA: %d\n", ret);
 581                 goto err5;
 582         }
 583
 584         return 0;
 585
 586 err5:
 587         clk_disable_unprepare(pcm->pclk);
 588 err4:
 589         iounmap(pcm->regs);
 590 err3:
 591         release_mem_region(mem_res->start, resource_size(mem_res));
 592 err2:
 593         clk_disable_unprepare(pcm->cclk);
 594 err1:
 595         return ret;
 596 }
 597
 598 static int s3c_pcm_dev_remove(struct platform_device *pdev)
 599 {
 600         struct s3c_pcm_info *pcm = &s3c_pcm[pdev->id];
 601         struct resource *mem_res;
 602
 603         pm_runtime_disable(&pdev->dev);
 604
 605         iounmap(pcm->regs);
 606
 607         mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 608         release_mem_region(mem_res->start, resource_size(mem_res));
 609
 610         clk_disable_unprepare(pcm->cclk);
 611         clk_disable_unprepare(pcm->pclk);
 612
 613         return 0;
 614 }
 615
 616 static struct platform_driver s3c_pcm_driver = {
 617         .probe  = s3c_pcm_dev_probe,
 618         .remove = s3c_pcm_dev_remove,
 619         .driver = {
 620                 .name = "samsung-pcm",
 621         },
 622 };
 623
 624 module_platform_driver(s3c_pcm_driver);
 625
 626 /* Module information */
 627 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
 628 MODULE_DESCRIPTION("S3C PCM Controller Driver");
 629 MODULE_LICENSE("GPL");
 630 MODULE_ALIAS("platform:samsung-pcm");