sound/soc/mxs/mxs-saif.c

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/slab.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/clk.h>
  25 #include <linux/delay.h>
  26 #include <linux/time.h>
  27 #include <sound/core.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/soc.h>
  31 #include <sound/saif.h>
  32 #include <mach/dma.h>
  33 #include <asm/mach-types.h>
  34 #include <mach/hardware.h>
  35 #include <mach/mxs.h>
  36
  37 #include "mxs-saif.h"
  38
  39 static struct mxs_saif *mxs_saif[2];
  40
  41 /*
  42  * SAIF is a little different with other normal SOC DAIs on clock using.
  43  *
  44  * For MXS, two SAIF modules are instantiated on-chip.
  45  * Each SAIF has a set of clock pins and can be operating in master
  46  * mode simultaneously if they are connected to different off-chip codecs.
  47  * Also, one of the two SAIFs can master or drive the clock pins while the
  48  * other SAIF, in slave mode, receives clocking from the master SAIF.
  49  * This also means that both SAIFs must operate at the same sample rate.
  50  *
  51  * We abstract this as each saif has a master, the master could be
  52  * himself or other saifs. In the generic saif driver, saif does not need
  53  * to know the different clkmux. Saif only needs to know who is his master
  54  * and operating his master to generate the proper clock rate for him.
  55  * The master id is provided in mach-specific layer according to different
  56  * clkmux setting.
  57  */
  58
  59 static int mxs_saif_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
  60                         int clk_id, unsigned int freq, int dir)
  61 {
  62         struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
  63
  64         switch (clk_id) {
  65         case MXS_SAIF_MCLK:
  66                 saif->mclk = freq;
  67                 break;
  68         default:
  69                 return -EINVAL;
  70         }
  71         return 0;
  72 }
  73
  74 /*
  75  * Since SAIF may work on EXTMASTER mode, IOW, it's working BITCLK&LRCLK
  76  * is provided by other SAIF, we provide a interface here to get its master
  77  * from its master_id.
  78  * Note that the master could be himself.
  79  */
  80 static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif)
  81 {
  82         return mxs_saif[saif->master_id];
  83 }
  84
  85 /*
  86  * Set SAIF clock and MCLK
  87  */
  88 static int mxs_saif_set_clk(struct mxs_saif *saif,
  89                                   unsigned int mclk,
  90                                   unsigned int rate)
  91 {
  92         u32 scr;
  93         int ret;
  94         struct mxs_saif *master_saif;
  95
  96         dev_dbg(saif->dev, "mclk %d rate %d\n", mclk, rate);
  97
  98         /* Set master saif to generate proper clock */
  99         master_saif = mxs_saif_get_master(saif);
 100         if (!master_saif)
 101                 return -EINVAL;
 102
 103         dev_dbg(saif->dev, "master saif%d\n", master_saif->id);
 104
 105         /* Checking if can playback and capture simutaneously */
 106         if (master_saif->ongoing && rate != master_saif->cur_rate) {
 107                 dev_err(saif->dev,
 108                         "can not change clock, master saif%d(rate %d) is ongoing\n",
 109                         master_saif->id, master_saif->cur_rate);
 110                 return -EINVAL;
 111         }
 112
 113         scr = __raw_readl(master_saif->base + SAIF_CTRL);
 114         scr &= ~BM_SAIF_CTRL_BITCLK_MULT_RATE;
 115         scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
 116
 117         /*
 118          * Set SAIF clock
 119          *
 120          * The SAIF clock should be either 384*fs or 512*fs.
 121          * If MCLK is used, the SAIF clk ratio need to match mclk ratio.
 122          *  For 32x mclk, set saif clk as 512*fs.
 123          *  For 48x mclk, set saif clk as 384*fs.
 124          *
 125          * If MCLK is not used, we just set saif clk to 512*fs.
 126          */
 127         if (master_saif->mclk_in_use) {
 128                 if (mclk % 32 == 0) {
 129                         scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
 130                         ret = clk_set_rate(master_saif->clk, 512 * rate);
 131                 } else if (mclk % 48 == 0) {
 132                         scr |= BM_SAIF_CTRL_BITCLK_BASE_RATE;
 133                         ret = clk_set_rate(master_saif->clk, 384 * rate);
 134                 } else {
 135                         /* SAIF MCLK should be either 32x or 48x */
 136                         return -EINVAL;
 137                 }
 138         } else {
 139                 ret = clk_set_rate(master_saif->clk, 512 * rate);
 140                 scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
 141         }
 142
 143         if (ret)
 144                 return ret;
 145
 146         master_saif->cur_rate = rate;
 147
 148         if (!master_saif->mclk_in_use) {
 149                 __raw_writel(scr, master_saif->base + SAIF_CTRL);
 150                 return 0;
 151         }
 152
 153         /*
 154          * Program the over-sample rate for MCLK output
 155          *
 156          * The available MCLK range is 32x, 48x... 512x. The rate
 157          * could be from 8kHz to 192kH.
 158          */
 159         switch (mclk / rate) {
 160         case 32:
 161                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(4);
 162                 break;
 163         case 64:
 164                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3);
 165                 break;
 166         case 128:
 167                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2);
 168                 break;
 169         case 256:
 170                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1);
 171                 break;
 172         case 512:
 173                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0);
 174                 break;
 175         case 48:
 176                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3);
 177                 break;
 178         case 96:
 179                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2);
 180                 break;
 181         case 192:
 182                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1);
 183                 break;
 184         case 384:
 185                 scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0);
 186                 break;
 187         default:
 188                 return -EINVAL;
 189         }
 190
 191         __raw_writel(scr, master_saif->base + SAIF_CTRL);
 192
 193         return 0;
 194 }
 195
 196 /*
 197  * Put and disable MCLK.
 198  */
 199 int mxs_saif_put_mclk(unsigned int saif_id)
 200 {
 201         struct mxs_saif *saif = mxs_saif[saif_id];
 202         u32 stat;
 203
 204         if (!saif)
 205                 return -EINVAL;
 206
 207         stat = __raw_readl(saif->base + SAIF_STAT);
 208         if (stat & BM_SAIF_STAT_BUSY) {
 209                 dev_err(saif->dev, "error: busy\n");
 210                 return -EBUSY;
 211         }
 212
 213         clk_disable(saif->clk);
 214
 215         /* disable MCLK output */
 216         __raw_writel(BM_SAIF_CTRL_CLKGATE,
 217                 saif->base + SAIF_CTRL + MXS_SET_ADDR);
 218         __raw_writel(BM_SAIF_CTRL_RUN,
 219                 saif->base + SAIF_CTRL + MXS_CLR_ADDR);
 220
 221         saif->mclk_in_use = 0;
 222         return 0;
 223 }
 224
 225 /*
 226  * Get MCLK and set clock rate, then enable it
 227  *
 228  * This interface is used for codecs who are using MCLK provided
 229  * by saif.
 230  */
 231 int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk,
 232                                         unsigned int rate)
 233 {
 234         struct mxs_saif *saif = mxs_saif[saif_id];
 235         u32 stat;
 236         int ret;
 237         struct mxs_saif *master_saif;
 238
 239         if (!saif)
 240                 return -EINVAL;
 241
 242         /* Clear Reset */
 243         __raw_writel(BM_SAIF_CTRL_SFTRST,
 244                 saif->base + SAIF_CTRL + MXS_CLR_ADDR);
 245
 246         /* FIXME: need clear clk gate for register r/w */
 247         __raw_writel(BM_SAIF_CTRL_CLKGATE,
 248                 saif->base + SAIF_CTRL + MXS_CLR_ADDR);
 249
 250         master_saif = mxs_saif_get_master(saif);
 251         if (saif != master_saif) {
 252                 dev_err(saif->dev, "can not get mclk from a non-master saif\n");
 253                 return -EINVAL;
 254         }
 255
 256         stat = __raw_readl(saif->base + SAIF_STAT);
 257         if (stat & BM_SAIF_STAT_BUSY) {
 258                 dev_err(saif->dev, "error: busy\n");
 259                 return -EBUSY;
 260         }
 261
 262         saif->mclk_in_use = 1;
 263         ret = mxs_saif_set_clk(saif, mclk, rate);
 264         if (ret)
 265                 return ret;
 266
 267         ret = clk_enable(saif->clk);
 268         if (ret)
 269                 return ret;
 270
 271         /* enable MCLK output */
 272         __raw_writel(BM_SAIF_CTRL_RUN,
 273                 saif->base + SAIF_CTRL + MXS_SET_ADDR);
 274
 275         return 0;
 276 }
 277
 278 /*
 279  * SAIF DAI format configuration.
 280  * Should only be called when port is inactive.
 281  */
 282 static int mxs_saif_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
 283 {
 284         u32 scr, stat;
 285         u32 scr0;
 286         struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
 287
 288         stat = __raw_readl(saif->base + SAIF_STAT);
 289         if (stat & BM_SAIF_STAT_BUSY) {
 290                 dev_err(cpu_dai->dev, "error: busy\n");
 291                 return -EBUSY;
 292         }
 293
 294         scr0 = __raw_readl(saif->base + SAIF_CTRL);
 295         scr0 = scr0 & ~BM_SAIF_CTRL_BITCLK_EDGE & ~BM_SAIF_CTRL_LRCLK_POLARITY \
 296                 & ~BM_SAIF_CTRL_JUSTIFY & ~BM_SAIF_CTRL_DELAY;
 297         scr = 0;
 298
 299         /* DAI mode */
 300         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 301         case SND_SOC_DAIFMT_I2S:
 302                 /* data frame low 1clk before data */
 303                 scr |= BM_SAIF_CTRL_DELAY;
 304                 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
 305                 break;
 306         case SND_SOC_DAIFMT_LEFT_J:
 307                 /* data frame high with data */
 308                 scr &= ~BM_SAIF_CTRL_DELAY;
 309                 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
 310                 scr &= ~BM_SAIF_CTRL_JUSTIFY;
 311                 break;
 312         default:
 313                 return -EINVAL;
 314         }
 315
 316         /* DAI clock inversion */
 317         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 318         case SND_SOC_DAIFMT_IB_IF:
 319                 scr |= BM_SAIF_CTRL_BITCLK_EDGE;
 320                 scr |= BM_SAIF_CTRL_LRCLK_POLARITY;
 321                 break;
 322         case SND_SOC_DAIFMT_IB_NF:
 323                 scr |= BM_SAIF_CTRL_BITCLK_EDGE;
 324                 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
 325                 break;
 326         case SND_SOC_DAIFMT_NB_IF:
 327                 scr &= ~BM_SAIF_CTRL_BITCLK_EDGE;
 328                 scr |= BM_SAIF_CTRL_LRCLK_POLARITY;
 329                 break;
 330         case SND_SOC_DAIFMT_NB_NF:
 331                 scr &= ~BM_SAIF_CTRL_BITCLK_EDGE;
 332                 scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
 333                 break;
 334         }
 335
 336         /*
 337          * Note: We simply just support master mode since SAIF TX can only
 338          * work as master.
 339          * Here the master is relative to codec side.
 340          * Saif internally could be slave when working on EXTMASTER mode.
 341          * We just hide this to machine driver.
 342          */
 343         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 344         case SND_SOC_DAIFMT_CBS_CFS:
 345                 if (saif->id == saif->master_id)
 346                         scr &= ~BM_SAIF_CTRL_SLAVE_MODE;
 347                 else
 348                         scr |= BM_SAIF_CTRL_SLAVE_MODE;
 349
 350                 __raw_writel(scr | scr0, saif->base + SAIF_CTRL);
 351                 break;
 352         default:
 353                 return -EINVAL;
 354         }
 355
 356         return 0;
 357 }
 358
 359 static int mxs_saif_startup(struct snd_pcm_substream *substream,
 360                            struct snd_soc_dai *cpu_dai)
 361 {
 362         struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
 363         snd_soc_dai_set_dma_data(cpu_dai, substream, &saif->dma_param);
 364
 365         /* clear error status to 0 for each re-open */
 366         saif->fifo_underrun = 0;
 367         saif->fifo_overrun = 0;
 368
 369         /* Clear Reset for normal operations */
 370         __raw_writel(BM_SAIF_CTRL_SFTRST,
 371                 saif->base + SAIF_CTRL + MXS_CLR_ADDR);
 372
 373         /* clear clock gate */
 374         __raw_writel(BM_SAIF_CTRL_CLKGATE,
 375                 saif->base + SAIF_CTRL + MXS_CLR_ADDR);
 376
 377         return 0;
 378 }
 379
 380 /*
 381  * Should only be called when port is inactive.
 382  * although can be called multiple times by upper layers.
 383  */
 384 static int mxs_saif_hw_params(struct snd_pcm_substream *substream,
 385                              struct snd_pcm_hw_params *params,
 386                              struct snd_soc_dai *cpu_dai)
 387 {
 388         struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
 389         u32 scr, stat;
 390         int ret;
 391
 392         /* mclk should already be set */
 393         if (!saif->mclk && saif->mclk_in_use) {
 394                 dev_err(cpu_dai->dev, "set mclk first\n");
 395                 return -EINVAL;
 396         }
 397
 398         stat = __raw_readl(saif->base + SAIF_STAT);
 399         if (stat & BM_SAIF_STAT_BUSY) {
 400                 dev_err(cpu_dai->dev, "error: busy\n");
 401                 return -EBUSY;
 402         }
 403
 404         /*
 405          * Set saif clk based on sample rate.
 406          * If mclk is used, we also set mclk, if not, saif->mclk is
 407          * default 0, means not used.
 408          */
 409         ret = mxs_saif_set_clk(saif, saif->mclk, params_rate(params));
 410         if (ret) {
 411                 dev_err(cpu_dai->dev, "unable to get proper clk\n");
 412                 return ret;
 413         }
 414
 415         scr = __raw_readl(saif->base + SAIF_CTRL);
 416
 417         scr &= ~BM_SAIF_CTRL_WORD_LENGTH;
 418         scr &= ~BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
 419         switch (params_format(params)) {
 420         case SNDRV_PCM_FORMAT_S16_LE:
 421                 scr |= BF_SAIF_CTRL_WORD_LENGTH(0);
 422                 break;
 423         case SNDRV_PCM_FORMAT_S20_3LE:
 424                 scr |= BF_SAIF_CTRL_WORD_LENGTH(4);
 425                 scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
 426                 break;
 427         case SNDRV_PCM_FORMAT_S24_LE:
 428                 scr |= BF_SAIF_CTRL_WORD_LENGTH(8);
 429                 scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
 430                 break;
 431         default:
 432                 return -EINVAL;
 433         }
 434
 435         /* Tx/Rx config */
 436         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 437                 /* enable TX mode */
 438                 scr &= ~BM_SAIF_CTRL_READ_MODE;
 439         } else {
 440                 /* enable RX mode */
 441                 scr |= BM_SAIF_CTRL_READ_MODE;
 442         }
 443
 444         __raw_writel(scr, saif->base + SAIF_CTRL);
 445         return 0;
 446 }
 447
 448 static int mxs_saif_prepare(struct snd_pcm_substream *substream,
 449                            struct snd_soc_dai *cpu_dai)
 450 {
 451         struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
 452
 453         /* enable FIFO error irqs */
 454         __raw_writel(BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN,
 455                 saif->base + SAIF_CTRL + MXS_SET_ADDR);
 456
 457         return 0;
 458 }
 459
 460 static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
 461                                 struct snd_soc_dai *cpu_dai)
 462 {
 463         struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
 464         struct mxs_saif *master_saif;
 465         u32 delay;
 466
 467         master_saif = mxs_saif_get_master(saif);
 468         if (!master_saif)
 469                 return -EINVAL;
 470
 471         switch (cmd) {
 472         case SNDRV_PCM_TRIGGER_START:
 473         case SNDRV_PCM_TRIGGER_RESUME:
 474         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 475                 dev_dbg(cpu_dai->dev, "start\n");
 476
 477                 clk_enable(master_saif->clk);
 478                 if (!master_saif->mclk_in_use)
 479                         __raw_writel(BM_SAIF_CTRL_RUN,
 480                                 master_saif->base + SAIF_CTRL + MXS_SET_ADDR);
 481
 482                 /*
 483                  * If the saif's master is not himself, we also need to enable
 484                  * itself clk for its internal basic logic to work.
 485                  */
 486                 if (saif != master_saif) {
 487                         clk_enable(saif->clk);
 488                         __raw_writel(BM_SAIF_CTRL_RUN,
 489                                 saif->base + SAIF_CTRL + MXS_SET_ADDR);
 490                 }
 491
 492                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 493                         /*
 494                          * write a data to saif data register to trigger
 495                          * the transfer
 496                          */
 497                         __raw_writel(0, saif->base + SAIF_DATA);
 498                 } else {
 499                         /*
 500                          * read a data from saif data register to trigger
 501                          * the receive
 502                          */
 503                         __raw_readl(saif->base + SAIF_DATA);
 504                 }
 505
 506                 master_saif->ongoing = 1;
 507
 508                 dev_dbg(saif->dev, "CTRL 0x%x STAT 0x%x\n",
 509                         __raw_readl(saif->base + SAIF_CTRL),
 510                         __raw_readl(saif->base + SAIF_STAT));
 511
 512                 dev_dbg(master_saif->dev, "CTRL 0x%x STAT 0x%x\n",
 513                         __raw_readl(master_saif->base + SAIF_CTRL),
 514                         __raw_readl(master_saif->base + SAIF_STAT));
 515                 break;
 516         case SNDRV_PCM_TRIGGER_SUSPEND:
 517         case SNDRV_PCM_TRIGGER_STOP:
 518         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 519                 dev_dbg(cpu_dai->dev, "stop\n");
 520
 521                 /* wait a while for the current sample to complete */
 522                 delay = USEC_PER_SEC / master_saif->cur_rate;
 523
 524                 if (!master_saif->mclk_in_use) {
 525                         __raw_writel(BM_SAIF_CTRL_RUN,
 526                                 master_saif->base + SAIF_CTRL + MXS_CLR_ADDR);
 527                         udelay(delay);
 528                 }
 529                 clk_disable(master_saif->clk);
 530
 531                 if (saif != master_saif) {
 532                         __raw_writel(BM_SAIF_CTRL_RUN,
 533                                 saif->base + SAIF_CTRL + MXS_CLR_ADDR);
 534                         udelay(delay);
 535                         clk_disable(saif->clk);
 536                 }
 537
 538                 master_saif->ongoing = 0;
 539
 540                 break;
 541         default:
 542                 return -EINVAL;
 543         }
 544
 545         return 0;
 546 }
 547
 548 #define MXS_SAIF_RATES          SNDRV_PCM_RATE_8000_192000
 549 #define MXS_SAIF_FORMATS \
 550         (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
 551         SNDRV_PCM_FMTBIT_S24_LE)
 552
 553 static struct snd_soc_dai_ops mxs_saif_dai_ops = {
 554         .startup = mxs_saif_startup,
 555         .trigger = mxs_saif_trigger,
 556         .prepare = mxs_saif_prepare,
 557         .hw_params = mxs_saif_hw_params,
 558         .set_sysclk = mxs_saif_set_dai_sysclk,
 559         .set_fmt = mxs_saif_set_dai_fmt,
 560 };
 561
 562 static int mxs_saif_dai_probe(struct snd_soc_dai *dai)
 563 {
 564         struct mxs_saif *saif = dev_get_drvdata(dai->dev);
 565
 566         snd_soc_dai_set_drvdata(dai, saif);
 567
 568         return 0;
 569 }
 570
 571 static struct snd_soc_dai_driver mxs_saif_dai = {
 572         .name = "mxs-saif",
 573         .probe = mxs_saif_dai_probe,
 574         .playback = {
 575                 .channels_min = 2,
 576                 .channels_max = 2,
 577                 .rates = MXS_SAIF_RATES,
 578                 .formats = MXS_SAIF_FORMATS,
 579         },
 580         .capture = {
 581                 .channels_min = 2,
 582                 .channels_max = 2,
 583                 .rates = MXS_SAIF_RATES,
 584                 .formats = MXS_SAIF_FORMATS,
 585         },
 586         .ops = &mxs_saif_dai_ops,
 587 };
 588
 589 static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
 590 {
 591         struct mxs_saif *saif = dev_id;
 592         unsigned int stat;
 593
 594         stat = __raw_readl(saif->base + SAIF_STAT);
 595         if (!(stat & (BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ |
 596                         BM_SAIF_STAT_FIFO_OVERFLOW_IRQ)))
 597                 return IRQ_NONE;
 598
 599         if (stat & BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ) {
 600                 dev_dbg(saif->dev, "underrun!!! %d\n", ++saif->fifo_underrun);
 601                 __raw_writel(BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ,
 602                                 saif->base + SAIF_STAT + MXS_CLR_ADDR);
 603         }
 604
 605         if (stat & BM_SAIF_STAT_FIFO_OVERFLOW_IRQ) {
 606                 dev_dbg(saif->dev, "overrun!!! %d\n", ++saif->fifo_overrun);
 607                 __raw_writel(BM_SAIF_STAT_FIFO_OVERFLOW_IRQ,
 608                                 saif->base + SAIF_STAT + MXS_CLR_ADDR);
 609         }
 610
 611         dev_dbg(saif->dev, "SAIF_CTRL %x SAIF_STAT %x\n",
 612                __raw_readl(saif->base + SAIF_CTRL),
 613                __raw_readl(saif->base + SAIF_STAT));
 614
 615         return IRQ_HANDLED;
 616 }
 617
 618 static int mxs_saif_probe(struct platform_device *pdev)
 619 {
 620         struct resource *iores, *dmares;
 621         struct mxs_saif *saif;
 622         struct mxs_saif_platform_data *pdata;
 623         int ret = 0;
 624
 625         if (pdev->id >= ARRAY_SIZE(mxs_saif))
 626                 return -EINVAL;
 627
 628         pdata = pdev->dev.platform_data;
 629         if (pdata && pdata->init) {
 630                 ret = pdata->init();
 631                 if (ret)
 632                         return ret;
 633         }
 634
 635         saif = kzalloc(sizeof(*saif), GFP_KERNEL);
 636         if (!saif)
 637                 return -ENOMEM;
 638
 639         mxs_saif[pdev->id] = saif;
 640         saif->id = pdev->id;
 641
 642         saif->master_id = saif->id;
 643         if (pdata && pdata->get_master_id) {
 644                 saif->master_id = pdata->get_master_id(saif->id);
 645                 if (saif->master_id < 0 ||
 646                         saif->master_id >= ARRAY_SIZE(mxs_saif))
 647                         return -EINVAL;
 648         }
 649
 650         saif->clk = clk_get(&pdev->dev, NULL);
 651         if (IS_ERR(saif->clk)) {
 652                 ret = PTR_ERR(saif->clk);
 653                 dev_err(&pdev->dev, "Cannot get the clock: %d\n",
 654                         ret);
 655                 goto failed_clk;
 656         }
 657
 658         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 659         if (!iores) {
 660                 ret = -ENODEV;
 661                 dev_err(&pdev->dev, "failed to get io resource: %d\n",
 662                         ret);
 663                 goto failed_get_resource;
 664         }
 665
 666         if (!request_mem_region(iores->start, resource_size(iores),
 667                                 "mxs-saif")) {
 668                 dev_err(&pdev->dev, "request_mem_region failed\n");
 669                 ret = -EBUSY;
 670                 goto failed_get_resource;
 671         }
 672
 673         saif->base = ioremap(iores->start, resource_size(iores));
 674         if (!saif->base) {
 675                 dev_err(&pdev->dev, "ioremap failed\n");
 676                 ret = -ENODEV;
 677                 goto failed_ioremap;
 678         }
 679
 680         dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 681         if (!dmares) {
 682                 ret = -ENODEV;
 683                 dev_err(&pdev->dev, "failed to get dma resource: %d\n",
 684                         ret);
 685                 goto failed_ioremap;
 686         }
 687         saif->dma_param.chan_num = dmares->start;
 688
 689         saif->irq = platform_get_irq(pdev, 0);
 690         if (saif->irq < 0) {
 691                 ret = saif->irq;
 692                 dev_err(&pdev->dev, "failed to get irq resource: %d\n",
 693                         ret);
 694                 goto failed_get_irq1;
 695         }
 696
 697         saif->dev = &pdev->dev;
 698         ret = request_irq(saif->irq, mxs_saif_irq, 0, "mxs-saif", saif);
 699         if (ret) {
 700                 dev_err(&pdev->dev, "failed to request irq\n");
 701                 goto failed_get_irq1;
 702         }
 703
 704         saif->dma_param.chan_irq = platform_get_irq(pdev, 1);
 705         if (saif->dma_param.chan_irq < 0) {
 706                 ret = saif->dma_param.chan_irq;
 707                 dev_err(&pdev->dev, "failed to get dma irq resource: %d\n",
 708                         ret);
 709                 goto failed_get_irq2;
 710         }
 711
 712         platform_set_drvdata(pdev, saif);
 713
 714         ret = snd_soc_register_dai(&pdev->dev, &mxs_saif_dai);
 715         if (ret) {
 716                 dev_err(&pdev->dev, "register DAI failed\n");
 717                 goto failed_register;
 718         }
 719
 720         saif->soc_platform_pdev = platform_device_alloc(
 721                                         "mxs-pcm-audio", pdev->id);
 722         if (!saif->soc_platform_pdev) {
 723                 ret = -ENOMEM;
 724                 goto failed_pdev_alloc;
 725         }
 726
 727         platform_set_drvdata(saif->soc_platform_pdev, saif);
 728         ret = platform_device_add(saif->soc_platform_pdev);
 729         if (ret) {
 730                 dev_err(&pdev->dev, "failed to add soc platform device\n");
 731                 goto failed_pdev_add;
 732         }
 733
 734         return 0;
 735
 736 failed_pdev_add:
 737         platform_device_put(saif->soc_platform_pdev);
 738 failed_pdev_alloc:
 739         snd_soc_unregister_dai(&pdev->dev);
 740 failed_register:
 741 failed_get_irq2:
 742         free_irq(saif->irq, saif);
 743 failed_get_irq1:
 744         iounmap(saif->base);
 745 failed_ioremap:
 746         release_mem_region(iores->start, resource_size(iores));
 747 failed_get_resource:
 748         clk_put(saif->clk);
 749 failed_clk:
 750         kfree(saif);
 751
 752         return ret;
 753 }
 754
 755 static int __devexit mxs_saif_remove(struct platform_device *pdev)
 756 {
 757         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 758         struct mxs_saif *saif = platform_get_drvdata(pdev);
 759
 760         platform_device_unregister(saif->soc_platform_pdev);
 761
 762         snd_soc_unregister_dai(&pdev->dev);
 763
 764         iounmap(saif->base);
 765         release_mem_region(res->start, resource_size(res));
 766         free_irq(saif->irq, saif);
 767
 768         clk_put(saif->clk);
 769         kfree(saif);
 770
 771         return 0;
 772 }
 773
 774 static struct platform_driver mxs_saif_driver = {
 775         .probe = mxs_saif_probe,
 776         .remove = __devexit_p(mxs_saif_remove),
 777
 778         .driver = {
 779                 .name = "mxs-saif",
 780                 .owner = THIS_MODULE,
 781         },
 782 };
 783
 784 static int __init mxs_saif_init(void)
 785 {
 786         return platform_driver_register(&mxs_saif_driver);
 787 }
 788
 789 static void __exit mxs_saif_exit(void)
 790 {
 791         platform_driver_unregister(&mxs_saif_driver);
 792 }
 793
 794 module_init(mxs_saif_init);
 795 module_exit(mxs_saif_exit);
 796 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
 797 MODULE_DESCRIPTION("MXS ASoC SAIF driver");
 798 MODULE_LICENSE("GPL");