sound/soc/samsung/i2s.c

   1 /* sound/soc/samsung/i2s.c
   2  *
   3  * ALSA SoC Audio Layer - Samsung I2S Controller driver
   4  *
   5  * Copyright (c) 2010 Samsung Electronics Co. Ltd.
   6  *      Jaswinder Singh <jassisinghbrar@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/slab.h>
  15 #include <linux/clk.h>
  16 #include <linux/io.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/of_device.h>
  20 #include <linux/pm_runtime.h>
  21
  22 #include <sound/soc.h>
  23 #include <sound/pcm_params.h>
  24
  25 #include <plat/audio.h>
  26 #include <plat/dma-pl330.h>
  27
  28 #include "dma.h"
  29 #include "idma.h"
  30 #include "i2s.h"
  31 #include "i2s-regs.h"
  32 #include "codec_plugin.h"
  33
  34 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
  35
  36 struct i2s_dai {
  37         /* Platform device for this DAI */
  38         struct platform_device *pdev;
  39         /* IOREMAP'd SFRs */
  40         void __iomem    *addr;
  41         /* Physical base address of SFRs */
  42         u32     base;
  43         /* Rate of RCLK source clock */
  44         unsigned long rclk_srcrate;
  45         /* Frame Clock */
  46         unsigned frmclk;
  47         /*
  48          * Specifically requested RCLK,BCLK by MACHINE Driver.
  49          * 0 indicates CPU driver is free to choose any value.
  50          */
  51         unsigned rfs, bfs;
  52         /* I2S Controller's core clock */
  53         struct clk *clk;
  54         /* Clock for generating I2S signals */
  55         struct clk *op_clk;
  56         /* Array of clock names for op_clk */
  57         const char **src_clk;
  58         /* Pointer to the Primary_Fifo if this is Sec_Fifo, NULL otherwise */
  59         struct i2s_dai *pri_dai;
  60         /* Pointer to the Secondary_Fifo if it has one, NULL otherwise */
  61         struct i2s_dai *sec_dai;
  62 #define DAI_OPENED      (1 << 0) /* Dai is opened */
  63 #define DAI_MANAGER     (1 << 1) /* Dai is the manager */
  64         unsigned mode;
  65         /* Driver for this DAI */
  66         struct snd_soc_dai_driver i2s_dai_drv;
  67         /* DMA parameters */
  68         struct s3c_dma_params dma_playback;
  69         struct s3c_dma_params dma_capture;
  70         struct s3c_dma_params idma_playback;
  71         struct audio_codec_plugin *plugin;
  72         u32     quirks;
  73         u32     suspend_i2smod;
  74         u32     suspend_i2scon;
  75         u32     suspend_i2spsr;
  76 };
  77
  78 /* Lock for cross i/f checks */
  79 static DEFINE_SPINLOCK(lock);
  80
  81 /* If this is the 'overlay' stereo DAI */
  82 static inline bool is_secondary(struct i2s_dai *i2s)
  83 {
  84         return i2s->pri_dai ? true : false;
  85 }
  86
  87 /* If operating in SoC-Slave mode */
  88 static inline bool is_slave(struct i2s_dai *i2s)
  89 {
  90         return (readl(i2s->addr + I2SMOD) & MOD_SLAVE) ? true : false;
  91 }
  92
  93 /* If this interface of the controller is transmitting data */
  94 static inline bool tx_active(struct i2s_dai *i2s)
  95 {
  96         u32 active;
  97
  98         if (!i2s)
  99                 return false;
 100
 101         active = readl(i2s->addr + I2SCON);
 102
 103         if (is_secondary(i2s))
 104                 active &= CON_TXSDMA_ACTIVE;
 105         else
 106                 active &= CON_TXDMA_ACTIVE;
 107
 108         return active ? true : false;
 109 }
 110
 111 /* If the other interface of the controller is transmitting data */
 112 static inline bool other_tx_active(struct i2s_dai *i2s)
 113 {
 114         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 115
 116         return tx_active(other);
 117 }
 118
 119 /* If any interface of the controller is transmitting data */
 120 static inline bool any_tx_active(struct i2s_dai *i2s)
 121 {
 122         return tx_active(i2s) || other_tx_active(i2s);
 123 }
 124
 125 /* If this interface of the controller is receiving data */
 126 static inline bool rx_active(struct i2s_dai *i2s)
 127 {
 128         u32 active;
 129
 130         if (!i2s)
 131                 return false;
 132
 133         active = readl(i2s->addr + I2SCON) & CON_RXDMA_ACTIVE;
 134
 135         return active ? true : false;
 136 }
 137
 138 /* If the other interface of the controller is receiving data */
 139 static inline bool other_rx_active(struct i2s_dai *i2s)
 140 {
 141         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 142
 143         return rx_active(other);
 144 }
 145
 146 /* If any interface of the controller is receiving data */
 147 static inline bool any_rx_active(struct i2s_dai *i2s)
 148 {
 149         return rx_active(i2s) || other_rx_active(i2s);
 150 }
 151
 152 /* If the other DAI is transmitting or receiving data */
 153 static inline bool other_active(struct i2s_dai *i2s)
 154 {
 155         return other_rx_active(i2s) || other_tx_active(i2s);
 156 }
 157
 158 /* If this DAI is transmitting or receiving data */
 159 static inline bool this_active(struct i2s_dai *i2s)
 160 {
 161         return tx_active(i2s) || rx_active(i2s);
 162 }
 163
 164 /* If the controller is active anyway */
 165 static inline bool any_active(struct i2s_dai *i2s)
 166 {
 167         return this_active(i2s) || other_active(i2s);
 168 }
 169
 170 static inline struct i2s_dai *to_info(struct snd_soc_dai *dai)
 171 {
 172         return snd_soc_dai_get_drvdata(dai);
 173 }
 174
 175 static inline bool is_opened(struct i2s_dai *i2s)
 176 {
 177         if (i2s && (i2s->mode & DAI_OPENED))
 178                 return true;
 179         else
 180                 return false;
 181 }
 182
 183 static inline bool is_manager(struct i2s_dai *i2s)
 184 {
 185         if (is_opened(i2s) && (i2s->mode & DAI_MANAGER))
 186                 return true;
 187         else
 188                 return false;
 189 }
 190
 191 /* Read RCLK of I2S (in multiples of LRCLK) */
 192 static inline unsigned get_rfs(struct i2s_dai *i2s)
 193 {
 194         u32 rfs = (readl(i2s->addr + I2SMOD) >> 3) & 0x3;
 195
 196         switch (rfs) {
 197         case 3: return 768;
 198         case 2: return 384;
 199         case 1: return 512;
 200         default: return 256;
 201         }
 202 }
 203
 204 /* Write RCLK of I2S (in multiples of LRCLK) */
 205 static inline void set_rfs(struct i2s_dai *i2s, unsigned rfs)
 206 {
 207         u32 mod = readl(i2s->addr + I2SMOD);
 208
 209         mod &= ~MOD_RCLK_MASK;
 210
 211         switch (rfs) {
 212         case 768:
 213                 mod |= MOD_RCLK_768FS;
 214                 break;
 215         case 512:
 216                 mod |= MOD_RCLK_512FS;
 217                 break;
 218         case 384:
 219                 mod |= MOD_RCLK_384FS;
 220                 break;
 221         default:
 222                 mod |= MOD_RCLK_256FS;
 223                 break;
 224         }
 225
 226         writel(mod, i2s->addr + I2SMOD);
 227 }
 228
 229 /* Read Bit-Clock of I2S (in multiples of LRCLK) */
 230 static inline unsigned get_bfs(struct i2s_dai *i2s)
 231 {
 232         u32 bfs = (readl(i2s->addr + I2SMOD) >> 1) & 0x3;
 233
 234         switch (bfs) {
 235         case 3: return 24;
 236         case 2: return 16;
 237         case 1: return 48;
 238         default: return 32;
 239         }
 240 }
 241
 242 /* Write Bit-Clock of I2S (in multiples of LRCLK) */
 243 static inline void set_bfs(struct i2s_dai *i2s, unsigned bfs)
 244 {
 245         u32 mod = readl(i2s->addr + I2SMOD);
 246
 247         mod &= ~MOD_BCLK_MASK;
 248
 249         switch (bfs) {
 250         case 48:
 251                 mod |= MOD_BCLK_48FS;
 252                 break;
 253         case 32:
 254                 mod |= MOD_BCLK_32FS;
 255                 break;
 256         case 24:
 257                 mod |= MOD_BCLK_24FS;
 258                 break;
 259         case 16:
 260                 mod |= MOD_BCLK_16FS;
 261                 break;
 262         default:
 263                 dev_err(&i2s->pdev->dev, "Wrong BCLK Divider!\n");
 264                 return;
 265         }
 266
 267         writel(mod, i2s->addr + I2SMOD);
 268 }
 269
 270 /* Sample-Size */
 271 static inline int get_blc(struct i2s_dai *i2s)
 272 {
 273         int blc = readl(i2s->addr + I2SMOD);
 274
 275         blc = (blc >> 13) & 0x3;
 276
 277         switch (blc) {
 278         case 2: return 24;
 279         case 1: return 8;
 280         default: return 16;
 281         }
 282 }
 283
 284 static int plugin_init(struct i2s_dai *i2s)
 285 {
 286         const char *plugin_name;
 287         struct device_node *plugin_node = NULL;
 288         struct platform_device *pdev;
 289         struct audio_codec_plugin *plugin;
 290
 291         if (!of_property_read_string_index(i2s->pdev->dev.of_node,
 292                                 "codec-plugin", 0, &plugin_name)) {
 293
 294                 plugin_node = of_find_node_by_name(NULL, plugin_name);
 295                 if (!plugin_node)
 296                         return -EFAULT;
 297
 298                 pdev = of_find_device_by_node(plugin_node);
 299                 if (!plugin_node)
 300                         return -EFAULT;
 301
 302                 plugin = dev_get_drvdata(&pdev->dev);
 303                 if (!plugin)
 304                         return -EFAULT;
 305                 else
 306                         if (i2s->plugin)
 307                                 dev_err(&i2s->pdev->dev, "plugin already intialised.\n");
 308                         i2s->plugin = plugin;
 309                 return 0;
 310         }
 311
 312         return -EFAULT;
 313 }
 314
 315 static void plugin_hw_params(struct snd_pcm_substream *substream,
 316         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 317 {
 318         struct i2s_dai *i2s = to_info(dai);
 319
 320         if (!i2s->plugin)
 321                 return;
 322
 323         if (!i2s->plugin->ops.hw_params)
 324                 return;
 325
 326         i2s->plugin->ops.hw_params(
 327                 i2s->plugin->dev, substream, params, dai);
 328         return;
 329 }
 330
 331 static void plugin_trigger(struct snd_pcm_substream *substream,
 332         int cmd, struct snd_soc_dai *dai)
 333 {
 334         struct i2s_dai *i2s = to_info(dai);
 335
 336         if (!i2s->plugin)
 337                 return;
 338
 339         if (!i2s->plugin->ops.trigger)
 340                 return;
 341
 342         i2s->plugin->ops.trigger(i2s->plugin->dev,
 343                         substream, cmd, dai);
 344         return;
 345 }
 346
 347 /* TX Channel Control */
 348 static void i2s_txctrl(struct i2s_dai *i2s, int on)
 349 {
 350         void __iomem *addr = i2s->addr;
 351         u32 con = readl(addr + I2SCON);
 352         u32 mod = readl(addr + I2SMOD) & ~MOD_MASK;
 353
 354         if (on) {
 355                 con |= CON_ACTIVE;
 356                 con &= ~CON_TXCH_PAUSE;
 357
 358                 if (is_secondary(i2s)) {
 359                         con |= CON_TXSDMA_ACTIVE;
 360                         con &= ~CON_TXSDMA_PAUSE;
 361                 } else {
 362                         con |= CON_TXDMA_ACTIVE;
 363                         con &= ~CON_TXDMA_PAUSE;
 364                 }
 365
 366                 if (any_rx_active(i2s))
 367                         mod |= MOD_TXRX;
 368                 else
 369                         mod |= MOD_TXONLY;
 370         } else {
 371                 if (is_secondary(i2s)) {
 372                         con |=  CON_TXSDMA_PAUSE;
 373                         con &= ~CON_TXSDMA_ACTIVE;
 374                 } else {
 375                         con |=  CON_TXDMA_PAUSE;
 376                         con &= ~CON_TXDMA_ACTIVE;
 377                 }
 378
 379                 if (other_tx_active(i2s)) {
 380                         writel(con, addr + I2SCON);
 381                         return;
 382                 }
 383
 384                 con |=  CON_TXCH_PAUSE;
 385
 386                 if (any_rx_active(i2s))
 387                         mod |= MOD_RXONLY;
 388                 else
 389                         con &= ~CON_ACTIVE;
 390         }
 391
 392         writel(mod, addr + I2SMOD);
 393         writel(con, addr + I2SCON);
 394 }
 395
 396 /* RX Channel Control */
 397 static void i2s_rxctrl(struct i2s_dai *i2s, int on)
 398 {
 399         void __iomem *addr = i2s->addr;
 400         u32 con = readl(addr + I2SCON);
 401         u32 mod = readl(addr + I2SMOD) & ~MOD_MASK;
 402
 403         if (on) {
 404                 con |= CON_RXDMA_ACTIVE | CON_ACTIVE;
 405                 con &= ~(CON_RXDMA_PAUSE | CON_RXCH_PAUSE);
 406
 407                 if (any_tx_active(i2s))
 408                         mod |= MOD_TXRX;
 409                 else
 410                         mod |= MOD_RXONLY;
 411         } else {
 412                 con |=  CON_RXDMA_PAUSE | CON_RXCH_PAUSE;
 413                 con &= ~CON_RXDMA_ACTIVE;
 414
 415                 if (any_tx_active(i2s))
 416                         mod |= MOD_TXONLY;
 417                 else
 418                         con &= ~CON_ACTIVE;
 419         }
 420
 421         writel(mod, addr + I2SMOD);
 422         writel(con, addr + I2SCON);
 423 }
 424
 425 /* Flush FIFO of an interface */
 426 static inline void i2s_fifo(struct i2s_dai *i2s, u32 flush)
 427 {
 428         void __iomem *fic;
 429         u32 val;
 430
 431         if (!i2s)
 432                 return;
 433
 434         if (is_secondary(i2s))
 435                 fic = i2s->addr + I2SFICS;
 436         else
 437                 fic = i2s->addr + I2SFIC;
 438
 439         /* Flush the FIFO */
 440         writel(readl(fic) | flush, fic);
 441
 442         /* Be patient */
 443         val = msecs_to_loops(1) / 1000; /* 1 usec */
 444         while (--val)
 445                 cpu_relax();
 446
 447         writel(readl(fic) & ~flush, fic);
 448 }
 449
 450 static int i2s_set_sysclk(struct snd_soc_dai *dai,
 451           int clk_id, unsigned int rfs, int dir)
 452 {
 453         struct i2s_dai *i2s = to_info(dai);
 454         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 455         u32 mod = readl(i2s->addr + I2SMOD);
 456
 457         switch (clk_id) {
 458         case SAMSUNG_I2S_CDCLK:
 459                 /* Shouldn't matter in GATING(CLOCK_IN) mode */
 460                 if (dir == SND_SOC_CLOCK_IN)
 461                         rfs = 0;
 462
 463                 if ((rfs && other->rfs && (other->rfs != rfs)) ||
 464                                 (any_active(i2s) &&
 465                                 (((dir == SND_SOC_CLOCK_IN)
 466                                         && !(mod & MOD_CDCLKCON)) ||
 467                                 ((dir == SND_SOC_CLOCK_OUT)
 468                                         && (mod & MOD_CDCLKCON))))) {
 469                         dev_err(&i2s->pdev->dev,
 470                                 "%s:%d Other DAI busy\n", __func__, __LINE__);
 471                         return -EAGAIN;
 472                 }
 473
 474                 if (dir == SND_SOC_CLOCK_IN)
 475                         mod |= MOD_CDCLKCON;
 476                 else
 477                         mod &= ~MOD_CDCLKCON;
 478
 479                 i2s->rfs = rfs;
 480                 break;
 481
 482         case SAMSUNG_I2S_RCLKSRC_0: /* clock corrsponding to IISMOD[10] := 0 */
 483         case SAMSUNG_I2S_RCLKSRC_1: /* clock corrsponding to IISMOD[10] := 1 */
 484                 if ((i2s->quirks & QUIRK_NO_MUXPSR)
 485                                 || (clk_id == SAMSUNG_I2S_RCLKSRC_0))
 486                         clk_id = 0;
 487                 else
 488                         clk_id = 1;
 489
 490                 if (!any_active(i2s)) {
 491                         if (i2s->op_clk) {
 492                                 if ((clk_id && !(mod & MOD_IMS_SYSMUX)) ||
 493                                         (!clk_id && (mod & MOD_IMS_SYSMUX))) {
 494                                         clk_disable(i2s->op_clk);
 495                                         clk_put(i2s->op_clk);
 496                                 } else {
 497                                         i2s->rclk_srcrate =
 498                                                 clk_get_rate(i2s->op_clk);
 499                                         return 0;
 500                                 }
 501                         }
 502
 503                         i2s->op_clk = clk_get(&i2s->pdev->dev,
 504                                                 i2s->src_clk[clk_id]);
 505                         clk_enable(i2s->op_clk);
 506                         i2s->rclk_srcrate = clk_get_rate(i2s->op_clk);
 507
 508                         /* Over-ride the other's */
 509                         if (other) {
 510                                 other->op_clk = i2s->op_clk;
 511                                 other->rclk_srcrate = i2s->rclk_srcrate;
 512                         }
 513                 } else if ((!clk_id && (mod & MOD_IMS_SYSMUX))
 514                                 || (clk_id && !(mod & MOD_IMS_SYSMUX))) {
 515                         dev_err(&i2s->pdev->dev,
 516                                 "%s:%d Other DAI busy\n", __func__, __LINE__);
 517                         return -EAGAIN;
 518                 } else {
 519                         /* Call can't be on the active DAI */
 520                         i2s->op_clk = other->op_clk;
 521                         i2s->rclk_srcrate = other->rclk_srcrate;
 522                         return 0;
 523                 }
 524
 525                 if (clk_id == 0)
 526                         mod &= ~MOD_IMS_SYSMUX;
 527                 else
 528                         mod |= MOD_IMS_SYSMUX;
 529                 break;
 530
 531         default:
 532                 dev_err(&i2s->pdev->dev, "We don't serve that!\n");
 533                 return -EINVAL;
 534         }
 535
 536         writel(mod, i2s->addr + I2SMOD);
 537
 538         return 0;
 539 }
 540
 541 static int i2s_set_fmt(struct snd_soc_dai *dai,
 542         unsigned int fmt)
 543 {
 544         struct i2s_dai *i2s = to_info(dai);
 545         u32 mod = readl(i2s->addr + I2SMOD);
 546         u32 tmp = 0;
 547
 548         /* Format is priority */
 549         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 550         case SND_SOC_DAIFMT_RIGHT_J:
 551                 tmp |= MOD_LR_RLOW;
 552                 tmp |= MOD_SDF_MSB;
 553                 break;
 554         case SND_SOC_DAIFMT_LEFT_J:
 555                 tmp |= MOD_LR_RLOW;
 556                 tmp |= MOD_SDF_LSB;
 557                 break;
 558         case SND_SOC_DAIFMT_I2S:
 559                 tmp |= MOD_SDF_IIS;
 560                 break;
 561         default:
 562                 dev_err(&i2s->pdev->dev, "Format not supported\n");
 563                 return -EINVAL;
 564         }
 565
 566         /*
 567          * INV flag is relative to the FORMAT flag - if set it simply
 568          * flips the polarity specified by the Standard
 569          */
 570         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 571         case SND_SOC_DAIFMT_NB_NF:
 572                 break;
 573         case SND_SOC_DAIFMT_NB_IF:
 574                 if (tmp & MOD_LR_RLOW)
 575                         tmp &= ~MOD_LR_RLOW;
 576                 else
 577                         tmp |= MOD_LR_RLOW;
 578                 break;
 579         default:
 580                 dev_err(&i2s->pdev->dev, "Polarity not supported\n");
 581                 return -EINVAL;
 582         }
 583
 584         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 585         case SND_SOC_DAIFMT_CBM_CFM:
 586                 tmp |= MOD_SLAVE;
 587                 break;
 588         case SND_SOC_DAIFMT_CBS_CFS:
 589                 /* Set default source clock in Master mode */
 590                 if (i2s->rclk_srcrate == 0)
 591                         i2s_set_sysclk(dai, SAMSUNG_I2S_RCLKSRC_0,
 592                                                         0, SND_SOC_CLOCK_IN);
 593                 break;
 594         default:
 595                 dev_err(&i2s->pdev->dev, "master/slave format not supported\n");
 596                 return -EINVAL;
 597         }
 598
 599         if (any_active(i2s) &&
 600                         ((mod & (MOD_SDF_MASK | MOD_LR_RLOW
 601                                 | MOD_SLAVE)) != tmp)) {
 602                 dev_err(&i2s->pdev->dev,
 603                                 "%s:%d Other DAI busy\n", __func__, __LINE__);
 604                 return -EAGAIN;
 605         }
 606
 607         mod &= ~(MOD_SDF_MASK | MOD_LR_RLOW | MOD_SLAVE);
 608         mod |= tmp;
 609         writel(mod, i2s->addr + I2SMOD);
 610
 611         return 0;
 612 }
 613
 614 static int i2s_hw_params(struct snd_pcm_substream *substream,
 615         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 616 {
 617         struct i2s_dai *i2s = to_info(dai);
 618         u32 mod = readl(i2s->addr + I2SMOD);
 619
 620         plugin_hw_params(substream, params, dai);
 621
 622         if (!is_secondary(i2s))
 623                 mod &= ~(MOD_DC2_EN | MOD_DC1_EN);
 624
 625         switch (params_channels(params)) {
 626         case 6:
 627                 mod |= MOD_DC2_EN;
 628         case 4:
 629                 mod |= MOD_DC1_EN;
 630                 break;
 631         case 2:
 632                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 633                         i2s->dma_playback.dma_size = 4;
 634                 else
 635                         i2s->dma_capture.dma_size = 4;
 636                 break;
 637         case 1:
 638                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 639                         i2s->dma_playback.dma_size = 2;
 640                 else
 641                         i2s->dma_capture.dma_size = 2;
 642
 643                 break;
 644         default:
 645                 dev_err(&i2s->pdev->dev, "%d channels not supported\n",
 646                                 params_channels(params));
 647                 return -EINVAL;
 648         }
 649
 650         if (is_secondary(i2s))
 651                 mod &= ~MOD_BLCS_MASK;
 652         else
 653                 mod &= ~MOD_BLCP_MASK;
 654
 655         if (is_manager(i2s))
 656                 mod &= ~MOD_BLC_MASK;
 657
 658         switch (params_format(params)) {
 659         case SNDRV_PCM_FORMAT_S8:
 660                 if (is_secondary(i2s))
 661                         mod |= MOD_BLCS_8BIT;
 662                 else
 663                         mod |= MOD_BLCP_8BIT;
 664                 if (is_manager(i2s))
 665                         mod |= MOD_BLC_8BIT;
 666                 break;
 667         case SNDRV_PCM_FORMAT_S16_LE:
 668                 if (is_secondary(i2s))
 669                         mod |= MOD_BLCS_16BIT;
 670                 else
 671                         mod |= MOD_BLCP_16BIT;
 672                 if (is_manager(i2s))
 673                         mod |= MOD_BLC_16BIT;
 674                 break;
 675         case SNDRV_PCM_FORMAT_S24_LE:
 676                 if (is_secondary(i2s))
 677                         mod |= MOD_BLCS_24BIT;
 678                 else
 679                         mod |= MOD_BLCP_24BIT;
 680                 if (is_manager(i2s))
 681                         mod |= MOD_BLC_24BIT;
 682                 break;
 683         default:
 684                 dev_err(&i2s->pdev->dev, "Format(%d) not supported\n",
 685                                 params_format(params));
 686                 return -EINVAL;
 687         }
 688         writel(mod, i2s->addr + I2SMOD);
 689
 690         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 691                 snd_soc_dai_set_dma_data(dai, substream,
 692                         (void *)&i2s->dma_playback);
 693         else
 694                 snd_soc_dai_set_dma_data(dai, substream,
 695                         (void *)&i2s->dma_capture);
 696
 697         i2s->frmclk = params_rate(params);
 698
 699         return 0;
 700 }
 701
 702 static void pm_runtime_ctl(struct i2s_dai *i2s, bool enabled)
 703 {
 704         struct platform_device *pdev = NULL;
 705
 706         pdev = is_secondary(i2s) ? i2s->pri_dai->pdev : i2s->pdev;
 707         enabled ? pm_runtime_get_sync(&pdev->dev)
 708                 : pm_runtime_put_sync(&pdev->dev);
 709 }
 710
 711 /* We set constraints on the substream acc to the version of I2S */
 712 static int i2s_startup(struct snd_pcm_substream *substream,
 713           struct snd_soc_dai *dai)
 714 {
 715         struct i2s_dai *i2s = to_info(dai);
 716         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 717         unsigned long flags;
 718
 719         pm_runtime_ctl(i2s, true);
 720
 721         /* Check not already running. */
 722         if (dai->playback_active || dai->capture_active)
 723                 return 0;
 724
 725         spin_lock_irqsave(&lock, flags);
 726
 727         i2s->mode |= DAI_OPENED;
 728
 729         if (is_manager(other))
 730                 i2s->mode &= ~DAI_MANAGER;
 731         else
 732                 i2s->mode |= DAI_MANAGER;
 733
 734         /* Enforce set_sysclk in Master mode */
 735         i2s->rclk_srcrate = 0;
 736
 737         if (!any_active(i2s) && (i2s->quirks & QUIRK_NEED_RSTCLR))
 738                 writel(CON_RSTCLR, i2s->addr + I2SCON);
 739
 740         spin_unlock_irqrestore(&lock, flags);
 741
 742         return 0;
 743 }
 744
 745 static void i2s_shutdown(struct snd_pcm_substream *substream,
 746         struct snd_soc_dai *dai)
 747 {
 748         struct i2s_dai *i2s = to_info(dai);
 749         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 750         unsigned long flags;
 751
 752         /* Check not still running. */
 753         if (dai->playback_active || dai->capture_active)
 754                 return;
 755
 756         spin_lock_irqsave(&lock, flags);
 757
 758         i2s->mode &= ~DAI_OPENED;
 759         i2s->mode &= ~DAI_MANAGER;
 760
 761         if (is_opened(other))
 762                 other->mode |= DAI_MANAGER;
 763
 764         /* Reset any constraint on RFS and BFS */
 765         i2s->rfs = 0;
 766         i2s->bfs = 0;
 767
 768         spin_unlock_irqrestore(&lock, flags);
 769
 770         /* Gate CDCLK by default */
 771         if (!is_opened(other))
 772                 i2s_set_sysclk(dai, SAMSUNG_I2S_CDCLK,
 773                                 0, SND_SOC_CLOCK_IN);
 774
 775          pm_runtime_ctl(i2s, false);
 776 }
 777
 778 static int config_setup(struct i2s_dai *i2s)
 779 {
 780         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 781         unsigned rfs, bfs, blc;
 782         u32 psr;
 783
 784         blc = get_blc(i2s);
 785
 786         bfs = i2s->bfs;
 787
 788         if (!bfs && other)
 789                 bfs = other->bfs;
 790
 791         /* Select least possible multiple(2) if no constraint set */
 792         if (!bfs)
 793                 bfs = blc * 2;
 794
 795         rfs = i2s->rfs;
 796
 797         if (!rfs && other)
 798                 rfs = other->rfs;
 799
 800         if ((rfs == 256 || rfs == 512) && (blc == 24)) {
 801                 dev_err(&i2s->pdev->dev,
 802                         "%d-RFS not supported for 24-blc\n", rfs);
 803                 return -EINVAL;
 804         }
 805
 806         if (!rfs) {
 807                 if (bfs == 16 || bfs == 32)
 808                         rfs = 256;
 809                 else
 810                         rfs = 384;
 811         }
 812
 813         /* If already setup and running */
 814         if (any_active(i2s) && (get_rfs(i2s) != rfs || get_bfs(i2s) != bfs)) {
 815                 dev_err(&i2s->pdev->dev,
 816                                 "%s:%d Other DAI busy\n", __func__, __LINE__);
 817                 return -EAGAIN;
 818         }
 819
 820         /* Don't bother RFS, BFS & PSR in Slave mode */
 821         if (is_slave(i2s))
 822                 return 0;
 823
 824         set_bfs(i2s, bfs);
 825         set_rfs(i2s, rfs);
 826
 827         if (!(i2s->quirks & QUIRK_NO_MUXPSR)) {
 828                 psr = i2s->rclk_srcrate / i2s->frmclk / rfs;
 829                 writel(((psr - 1) << 8) | PSR_PSREN, i2s->addr + I2SPSR);
 830                 dev_dbg(&i2s->pdev->dev,
 831                         "RCLK_SRC=%luHz PSR=%u, RCLK=%dfs, BCLK=%dfs\n",
 832                                 i2s->rclk_srcrate, psr, rfs, bfs);
 833         }
 834
 835         return 0;
 836 }
 837
 838 static int i2s_trigger(struct snd_pcm_substream *substream,
 839         int cmd, struct snd_soc_dai *dai)
 840 {
 841         int capture = (substream->stream == SNDRV_PCM_STREAM_CAPTURE);
 842         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 843         struct i2s_dai *i2s = to_info(rtd->cpu_dai);
 844         unsigned long flags;
 845
 846         plugin_trigger(substream, cmd, dai);
 847
 848         switch (cmd) {
 849         case SNDRV_PCM_TRIGGER_START:
 850         case SNDRV_PCM_TRIGGER_RESUME:
 851         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 852                 local_irq_save(flags);
 853
 854                 if (config_setup(i2s)) {
 855                         local_irq_restore(flags);
 856                         return -EINVAL;
 857                 }
 858
 859                 if (capture)
 860                         i2s_rxctrl(i2s, 1);
 861                 else
 862                         i2s_txctrl(i2s, 1);
 863
 864                 local_irq_restore(flags);
 865                 break;
 866         case SNDRV_PCM_TRIGGER_STOP:
 867         case SNDRV_PCM_TRIGGER_SUSPEND:
 868         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 869                 local_irq_save(flags);
 870
 871                 if (capture) {
 872                         i2s_rxctrl(i2s, 0);
 873                         i2s_fifo(i2s, FIC_RXFLUSH);
 874                 } else {
 875                         i2s_txctrl(i2s, 0);
 876                         i2s_fifo(i2s, FIC_TXFLUSH);
 877                 }
 878
 879                 local_irq_restore(flags);
 880                 break;
 881         }
 882
 883         return 0;
 884 }
 885
 886 static int i2s_set_clkdiv(struct snd_soc_dai *dai,
 887         int div_id, int div)
 888 {
 889         struct i2s_dai *i2s = to_info(dai);
 890         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 891
 892         switch (div_id) {
 893         case SAMSUNG_I2S_DIV_BCLK:
 894                 if ((any_active(i2s) && div && (get_bfs(i2s) != div))
 895                         || (other && other->bfs && (other->bfs != div))) {
 896                         dev_err(&i2s->pdev->dev,
 897                                 "%s:%d Other DAI busy\n", __func__, __LINE__);
 898                         return -EAGAIN;
 899                 }
 900                 i2s->bfs = div;
 901                 break;
 902         default:
 903                 dev_err(&i2s->pdev->dev,
 904                         "Invalid clock divider(%d)\n", div_id);
 905                 return -EINVAL;
 906         }
 907
 908         return 0;
 909 }
 910
 911 static snd_pcm_sframes_t
 912 i2s_delay(struct snd_pcm_substream *substream, struct snd_soc_dai *dai)
 913 {
 914         struct i2s_dai *i2s = to_info(dai);
 915         u32 reg = readl(i2s->addr + I2SFIC);
 916         snd_pcm_sframes_t delay;
 917
 918         if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 919                 delay = FIC_RXCOUNT(reg);
 920         else if (is_secondary(i2s))
 921                 delay = FICS_TXCOUNT(readl(i2s->addr + I2SFICS));
 922         else
 923                 delay = FIC_TXCOUNT(reg);
 924
 925         return delay;
 926 }
 927
 928 #ifdef CONFIG_PM
 929 static int i2s_suspend(struct snd_soc_dai *dai)
 930 {
 931         struct i2s_dai *i2s = to_info(dai);
 932
 933         if (dai->active) {
 934                 i2s->suspend_i2smod = readl(i2s->addr + I2SMOD);
 935                 i2s->suspend_i2scon = readl(i2s->addr + I2SCON);
 936                 i2s->suspend_i2spsr = readl(i2s->addr + I2SPSR);
 937         }
 938
 939         return 0;
 940 }
 941
 942 static int i2s_resume(struct snd_soc_dai *dai)
 943 {
 944         struct i2s_dai *i2s = to_info(dai);
 945
 946         if (dai->active) {
 947                 writel(i2s->suspend_i2scon, i2s->addr + I2SCON);
 948                 writel(i2s->suspend_i2smod, i2s->addr + I2SMOD);
 949                 writel(i2s->suspend_i2spsr, i2s->addr + I2SPSR);
 950         }
 951
 952         return 0;
 953 }
 954 #else
 955 #define i2s_suspend NULL
 956 #define i2s_resume  NULL
 957 #endif
 958
 959 #ifdef CONFIG_PM_RUNTIME
 960 static int i2s_runtime_suspend(struct device *dev)
 961 {
 962         struct i2s_dai *i2s = dev_get_drvdata(dev);
 963
 964         clk_disable(i2s->clk);
 965
 966         return 0;
 967 }
 968
 969 static int i2s_runtime_resume(struct device *dev)
 970 {
 971         struct i2s_dai *i2s = dev_get_drvdata(dev);
 972
 973         clk_enable(i2s->clk);
 974
 975         return 0;
 976 }
 977 #endif /* CONFIG_PM_RUNTIME */
 978
 979 static int samsung_i2s_dai_probe(struct snd_soc_dai *dai)
 980 {
 981         struct i2s_dai *i2s = to_info(dai);
 982         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
 983
 984         if (other && other->clk) /* If this is probe on secondary */
 985                 goto probe_exit;
 986
 987         i2s->addr = ioremap(i2s->base, 0x100);
 988         if (i2s->addr == NULL) {
 989                 dev_err(&i2s->pdev->dev, "cannot ioremap registers\n");
 990                 return -ENXIO;
 991         }
 992
 993         i2s->clk = clk_get(&i2s->pdev->dev, "iis");
 994         if (IS_ERR(i2s->clk)) {
 995                 dev_err(&i2s->pdev->dev, "failed to get i2s_clock\n");
 996                 iounmap(i2s->addr);
 997                 return -ENOENT;
 998         }
 999         clk_enable(i2s->clk);
1000
1001         if (other) {
1002                 other->addr = i2s->addr;
1003                 other->clk = i2s->clk;
1004         }
1005
1006         if (i2s->quirks & QUIRK_NEED_RSTCLR)
1007                 writel(CON_RSTCLR, i2s->addr + I2SCON);
1008
1009         if (i2s->quirks & QUIRK_SEC_DAI)
1010                 idma_reg_addr_init(i2s->addr,
1011                                         i2s->sec_dai->idma_playback.dma_addr);
1012
1013 probe_exit:
1014         /* Reset any constraint on RFS and BFS */
1015         i2s->rfs = 0;
1016         i2s->bfs = 0;
1017         i2s_txctrl(i2s, 0);
1018         i2s_rxctrl(i2s, 0);
1019         i2s_fifo(i2s, FIC_TXFLUSH);
1020         i2s_fifo(other, FIC_TXFLUSH);
1021         i2s_fifo(i2s, FIC_RXFLUSH);
1022
1023         /* Gate CDCLK by default */
1024         if (!is_opened(other))
1025                 i2s_set_sysclk(dai, SAMSUNG_I2S_CDCLK,
1026                                 0, SND_SOC_CLOCK_IN);
1027
1028         clk_disable(i2s->clk);
1029         return 0;
1030 }
1031
1032 static int samsung_i2s_dai_remove(struct snd_soc_dai *dai)
1033 {
1034         struct i2s_dai *i2s = snd_soc_dai_get_drvdata(dai);
1035         struct i2s_dai *other = i2s->pri_dai ? : i2s->sec_dai;
1036
1037         if (!other || !other->clk) {
1038
1039                 if (i2s->quirks & QUIRK_NEED_RSTCLR)
1040                         writel(0, i2s->addr + I2SCON);
1041
1042                 clk_disable(i2s->clk);
1043                 clk_put(i2s->clk);
1044
1045                 iounmap(i2s->addr);
1046         }
1047
1048         i2s->clk = NULL;
1049
1050         return 0;
1051 }
1052
1053 static const struct snd_soc_dai_ops samsung_i2s_dai_ops = {
1054         .trigger = i2s_trigger,
1055         .hw_params = i2s_hw_params,
1056         .set_fmt = i2s_set_fmt,
1057         .set_clkdiv = i2s_set_clkdiv,
1058         .set_sysclk = i2s_set_sysclk,
1059         .startup = i2s_startup,
1060         .shutdown = i2s_shutdown,
1061         .delay = i2s_delay,
1062 };
1063
1064 #define SAMSUNG_I2S_RATES       SNDRV_PCM_RATE_8000_96000
1065
1066 #define SAMSUNG_I2S_FMTS        (SNDRV_PCM_FMTBIT_S8 | \
1067                                         SNDRV_PCM_FMTBIT_S16_LE | \
1068                                         SNDRV_PCM_FMTBIT_S24_LE)
1069
1070 static __devinit
1071 struct i2s_dai *i2s_alloc_dai(struct platform_device *pdev, bool sec)
1072 {
1073         struct i2s_dai *i2s;
1074         int id;
1075
1076         i2s = devm_kzalloc(&pdev->dev, sizeof(struct i2s_dai), GFP_KERNEL);
1077         if (i2s == NULL)
1078                 return NULL;
1079
1080         i2s->pdev = pdev;
1081         i2s->pri_dai = NULL;
1082         i2s->sec_dai = NULL;
1083         i2s->i2s_dai_drv.symmetric_rates = 1;
1084         i2s->i2s_dai_drv.probe = samsung_i2s_dai_probe;
1085         i2s->i2s_dai_drv.remove = samsung_i2s_dai_remove;
1086         i2s->i2s_dai_drv.ops = &samsung_i2s_dai_ops;
1087         i2s->i2s_dai_drv.suspend = i2s_suspend;
1088         i2s->i2s_dai_drv.resume = i2s_resume;
1089         i2s->i2s_dai_drv.playback.channels_min = 2;
1090         i2s->i2s_dai_drv.playback.channels_max = 2;
1091         i2s->i2s_dai_drv.playback.rates = SAMSUNG_I2S_RATES;
1092         i2s->i2s_dai_drv.playback.formats = SAMSUNG_I2S_FMTS;
1093
1094         if (!sec) {
1095                 i2s->i2s_dai_drv.capture.channels_min = 1;
1096                 i2s->i2s_dai_drv.capture.channels_max = 2;
1097                 i2s->i2s_dai_drv.capture.rates = SAMSUNG_I2S_RATES;
1098                 i2s->i2s_dai_drv.capture.formats = SAMSUNG_I2S_FMTS;
1099         } else {        /* Create a new platform_device for Secondary */
1100                 if (pdev->dev.of_node) {
1101                         id = of_alias_get_id(pdev->dev.of_node, "i2s");
1102                         if (id < 0)
1103                                 dev_err(&pdev->dev,
1104                                         "failed to get alias id:%d\n", id);
1105                 } else {
1106                         id = pdev->id;
1107                 }
1108
1109                 i2s->pdev = platform_device_register_resndata(NULL,
1110                                 "samsung-i2s", id + SAMSUNG_I2S_SECOFF,
1111                                 NULL, 0, NULL, 0);
1112                 if (IS_ERR(i2s->pdev))
1113                         return NULL;
1114         }
1115
1116         /* Pre-assign snd_soc_dai_set_drvdata */
1117         dev_set_drvdata(&i2s->pdev->dev, i2s);
1118
1119         return i2s;
1120 }
1121
1122 static __devinit int samsung_i2s_probe(struct platform_device *pdev)
1123 {
1124         u32 dma_pl_chan, dma_cp_chan;
1125         u32 dma_pl_sec_chan = 0;
1126         struct i2s_dai *pri_dai, *sec_dai = NULL;
1127         struct s3c_audio_pdata *i2s_pdata;
1128         struct samsung_i2s *i2s_cfg;
1129         struct resource *res;
1130         u32 regs_base, quirks;
1131         struct property *prop;
1132         int ret = 0, id;
1133
1134         /* Call during Seconday interface registration */
1135         if (pdev->dev.of_node) {
1136                 id = of_alias_get_id(pdev->dev.of_node, "i2s");
1137                 if (id < 0)
1138                         dev_err(&pdev->dev, "failed to get alias id:%d\n", id);
1139         } else {
1140                 id = pdev->id;
1141         }
1142
1143         if (id >= SAMSUNG_I2S_SECOFF) {
1144                 sec_dai = dev_get_drvdata(&pdev->dev);
1145                 snd_soc_register_dai(&sec_dai->pdev->dev,
1146                         &sec_dai->i2s_dai_drv);
1147                 return 0;
1148         }
1149
1150         i2s_pdata = pdev->dev.platform_data;
1151         if (i2s_pdata == NULL) {
1152                 dev_err(&pdev->dev, "Can't work without s3c_audio_pdata\n");
1153                 return -EINVAL;
1154         }
1155
1156         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1157         if (!res) {
1158                 dev_err(&pdev->dev, "Unable to get I2S SFR address\n");
1159                 return -ENXIO;
1160         }
1161
1162         if (!request_mem_region(res->start, resource_size(res),
1163                                                         "samsung-i2s")) {
1164                 dev_err(&pdev->dev, "Unable to request SFR region\n");
1165                 return -EBUSY;
1166         }
1167         regs_base = res->start;
1168
1169         i2s_cfg = &i2s_pdata->type.i2s;
1170         quirks = i2s_cfg->quirks;
1171
1172         pri_dai = i2s_alloc_dai(pdev, false);
1173         if (!pri_dai) {
1174                 dev_err(&pdev->dev, "Unable to alloc I2S_pri\n");
1175                 ret = -ENOMEM;
1176                 goto err;
1177         }
1178
1179         if (!pdev->dev.of_node) {
1180                 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
1181                 if (!res) {
1182                         dev_err(&pdev->dev,
1183                                 "Unable to get I2S-TX dma resource\n");
1184                         return -ENXIO;
1185                 }
1186                 dma_pl_chan = res->start;
1187
1188                 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
1189                 if (!res) {
1190                         dev_err(&pdev->dev,
1191                                 "Unable to get I2S-RX dma resource\n");
1192                         return -ENXIO;
1193                 }
1194                 dma_cp_chan = res->start;
1195
1196                 res = platform_get_resource(pdev, IORESOURCE_DMA, 2);
1197                 if (res)
1198                         dma_pl_sec_chan = res->start;
1199         } else {
1200                 prop = of_find_property(pdev->dev.of_node,
1201                                         "tx-dma-channel", NULL);
1202                 dma_pl_chan = DMACH_DT_PROP;
1203                 pri_dai->dma_playback.dma_prop = prop;
1204
1205                 prop = of_find_property(pdev->dev.of_node,
1206                                         "rx-dma-channel", NULL);
1207                 dma_cp_chan = DMACH_DT_PROP;
1208                 pri_dai->dma_capture.dma_prop = prop;
1209
1210                 plugin_init(pri_dai);
1211         }
1212
1213         pri_dai->dma_playback.dma_addr = regs_base + I2STXD;
1214         pri_dai->dma_capture.dma_addr = regs_base + I2SRXD;
1215         pri_dai->dma_playback.client =
1216                 (struct s3c2410_dma_client *)&pri_dai->dma_playback;
1217         pri_dai->dma_capture.client =
1218                 (struct s3c2410_dma_client *)&pri_dai->dma_capture;
1219         pri_dai->dma_playback.channel = dma_pl_chan;
1220         pri_dai->dma_capture.channel = dma_cp_chan;
1221         pri_dai->src_clk = i2s_cfg->src_clk;
1222         pri_dai->dma_playback.dma_size = 4;
1223         pri_dai->dma_capture.dma_size = 4;
1224         pri_dai->base = regs_base;
1225         pri_dai->quirks = quirks;
1226
1227         if (quirks & QUIRK_PRI_6CHAN)
1228                 pri_dai->i2s_dai_drv.playback.channels_max = 6;
1229
1230         if (quirks & QUIRK_SEC_DAI) {
1231                 sec_dai = i2s_alloc_dai(pdev, true);
1232                 if (!sec_dai) {
1233                         dev_err(&pdev->dev, "Unable to alloc I2S_sec\n");
1234                         ret = -ENOMEM;
1235                         goto err;
1236                 }
1237                 sec_dai->dma_playback.dma_addr = regs_base + I2STXDS;
1238                 sec_dai->dma_playback.client =
1239                         (struct s3c2410_dma_client *)&sec_dai->dma_playback;
1240
1241                 if (pdev->dev.of_node) {
1242                         prop = of_find_property(pdev->dev.of_node,
1243                                                 "tx-dma-channel-secondary",
1244                                                 NULL);
1245                         sec_dai->dma_playback.dma_prop = prop;
1246                 }
1247
1248                 /* Use iDMA always if SysDMA not provided */
1249                 sec_dai->dma_playback.channel = dma_pl_sec_chan ? : -1;
1250                 sec_dai->src_clk = i2s_cfg->src_clk;
1251                 sec_dai->dma_playback.dma_size = 4;
1252                 sec_dai->base = regs_base;
1253                 sec_dai->quirks = quirks;
1254                 sec_dai->idma_playback.dma_addr = i2s_cfg->idma_addr;
1255                 sec_dai->pri_dai = pri_dai;
1256                 pri_dai->sec_dai = sec_dai;
1257         }
1258
1259         if (i2s_pdata->cfg_gpio && i2s_pdata->cfg_gpio(pdev)) {
1260                 dev_err(&pdev->dev, "Unable to configure gpio\n");
1261                 ret = -EINVAL;
1262                 goto err;
1263         }
1264
1265         snd_soc_register_dai(&pri_dai->pdev->dev, &pri_dai->i2s_dai_drv);
1266
1267         pm_runtime_enable(&pdev->dev);
1268
1269         return 0;
1270 err:
1271         release_mem_region(regs_base, resource_size(res));
1272
1273         return ret;
1274 }
1275
1276 static __devexit int samsung_i2s_remove(struct platform_device *pdev)
1277 {
1278         struct i2s_dai *i2s, *other;
1279         struct resource *res;
1280
1281         i2s = dev_get_drvdata(&pdev->dev);
1282         other = i2s->pri_dai ? : i2s->sec_dai;
1283
1284         if (other) {
1285                 other->pri_dai = NULL;
1286                 other->sec_dai = NULL;
1287         } else {
1288                 pm_runtime_disable(&pdev->dev);
1289                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1290                 if (res)
1291                         release_mem_region(res->start, resource_size(res));
1292         }
1293
1294         i2s->pri_dai = NULL;
1295         i2s->sec_dai = NULL;
1296
1297         snd_soc_unregister_dai(&pdev->dev);
1298
1299         return 0;
1300 }
1301
1302 #ifdef CONFIG_OF
1303 static const struct of_device_id exynos_i2s_match[] = {
1304         { .compatible = "samsung,i2s" },
1305         {},
1306 };
1307 MODULE_DEVICE_TABLE(of, exynos_i2s_match);
1308 #endif
1309
1310 static const struct dev_pm_ops samsung_i2s_pm = {
1311         SET_RUNTIME_PM_OPS(i2s_runtime_suspend,
1312                                 i2s_runtime_resume, NULL)
1313 };
1314
1315 static struct platform_driver samsung_i2s_driver = {
1316         .probe  = samsung_i2s_probe,
1317         .remove = __devexit_p(samsung_i2s_remove),
1318         .driver = {
1319                 .name = "samsung-i2s",
1320                 .owner = THIS_MODULE,
1321                 .pm = &samsung_i2s_pm,
1322                 .of_match_table = of_match_ptr(exynos_i2s_match),
1323         },
1324 };
1325
1326 module_platform_driver(samsung_i2s_driver);
1327
1328 /* Module information */
1329 MODULE_AUTHOR("Jaswinder Singh, <jassisinghbrar@gmail.com>");
1330 MODULE_DESCRIPTION("Samsung I2S Interface");
1331 MODULE_ALIAS("platform:samsung-i2s");
1332 MODULE_VERSION("1:1.0");
1333 MODULE_LICENSE("GPL");