root/sound/soc/fsl/imx-ssi.c

DEFINITIONS

1. imx_ssi_set_dai_tdm_slot
2. imx_ssi_set_dai_fmt
3. imx_ssi_set_dai_sysclk
4. imx_ssi_set_dai_clkdiv
5. imx_ssi_hw_params
6. imx_ssi_trigger
7. imx_ssi_dai_probe
8. setup_channel_to_ac97
9. imx_ssi_ac97_write
10. imx_ssi_ac97_read
11. imx_ssi_ac97_reset
12. imx_ssi_ac97_warm_reset
13. imx_ssi_probe
14. imx_ssi_remove

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // imx-ssi.c  --  ALSA Soc Audio Layer
   4 //
   5 // Copyright 2009 Sascha Hauer <s.hauer@pengutronix.de>
   6 //
   7 // This code is based on code copyrighted by Freescale,
   8 // Liam Girdwood, Javier Martin and probably others.
   9 //
  10 // The i.MX SSI core has some nasty limitations in AC97 mode. While most
  11 // sane processor vendors have a FIFO per AC97 slot, the i.MX has only
  12 // one FIFO which combines all valid receive slots. We cannot even select
  13 // which slots we want to receive. The WM9712 with which this driver
  14 // was developed with always sends GPIO status data in slot 12 which
  15 // we receive in our (PCM-) data stream. The only chance we have is to
  16 // manually skip this data in the FIQ handler. With sampling rates different
  17 // from 48000Hz not every frame has valid receive data, so the ratio
  18 // between pcm data and GPIO status data changes. Our FIQ handler is not
  19 // able to handle this, hence this driver only works with 48000Hz sampling
  20 // rate.
  21 // Reading and writing AC97 registers is another challenge. The core
  22 // provides us status bits when the read register is updated with *another*
  23 // value. When we read the same register two times (and the register still
  24 // contains the same value) these status bits are not set. We work
  25 // around this by not polling these bits but only wait a fixed delay.
  26 
  27 #include <linux/clk.h>
  28 #include <linux/delay.h>
  29 #include <linux/device.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/init.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/module.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/slab.h>
  36 
  37 #include <sound/core.h>
  38 #include <sound/initval.h>
  39 #include <sound/pcm.h>
  40 #include <sound/pcm_params.h>
  41 #include <sound/soc.h>
  42 
  43 #include <linux/platform_data/asoc-imx-ssi.h>
  44 
  45 #include "imx-ssi.h"
  46 #include "fsl_utils.h"
  47 
  48 #define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV)
  49 
  50 /*
  51  * SSI Network Mode or TDM slots configuration.
  52  * Should only be called when port is inactive (i.e. SSIEN = 0).
  53  */
  54 static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
  55         unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)
  56 {
  57         struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
  58         u32 sccr;
  59 
  60         sccr = readl(ssi->base + SSI_STCCR);
  61         sccr &= ~SSI_STCCR_DC_MASK;
  62         sccr |= SSI_STCCR_DC(slots - 1);
  63         writel(sccr, ssi->base + SSI_STCCR);
  64 
  65         sccr = readl(ssi->base + SSI_SRCCR);
  66         sccr &= ~SSI_STCCR_DC_MASK;
  67         sccr |= SSI_STCCR_DC(slots - 1);
  68         writel(sccr, ssi->base + SSI_SRCCR);
  69 
  70         writel(~tx_mask, ssi->base + SSI_STMSK);
  71         writel(~rx_mask, ssi->base + SSI_SRMSK);
  72 
  73         return 0;
  74 }
  75 
  76 /*
  77  * SSI DAI format configuration.
  78  * Should only be called when port is inactive (i.e. SSIEN = 0).
  79  */
  80 static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
  81 {
  82         struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
  83         u32 strcr = 0, scr;
  84 
  85         scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET);
  86 
  87         /* DAI mode */
  88         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
  89         case SND_SOC_DAIFMT_I2S:
  90                 /* data on rising edge of bclk, frame low 1clk before data */
  91                 strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP | SSI_STCR_TFSI |
  92                         SSI_STCR_TEFS;
  93                 scr |= SSI_SCR_NET;
  94                 if (ssi->flags & IMX_SSI_USE_I2S_SLAVE) {
  95                         scr &= ~SSI_I2S_MODE_MASK;
  96                         scr |= SSI_SCR_I2S_MODE_SLAVE;
  97                 }
  98                 break;
  99         case SND_SOC_DAIFMT_LEFT_J:
 100                 /* data on rising edge of bclk, frame high with data */
 101                 strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP;
 102                 break;
 103         case SND_SOC_DAIFMT_DSP_B:
 104                 /* data on rising edge of bclk, frame high with data */
 105                 strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP | SSI_STCR_TFSL;
 106                 break;
 107         case SND_SOC_DAIFMT_DSP_A:
 108                 /* data on rising edge of bclk, frame high 1clk before data */
 109                 strcr |= SSI_STCR_TXBIT0 | SSI_STCR_TSCKP | SSI_STCR_TFSL |
 110                         SSI_STCR_TEFS;
 111                 break;
 112         }
 113 
 114         /* DAI clock inversion */
 115         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 116         case SND_SOC_DAIFMT_IB_IF:
 117                 strcr ^= SSI_STCR_TSCKP | SSI_STCR_TFSI;
 118                 break;
 119         case SND_SOC_DAIFMT_IB_NF:
 120                 strcr ^= SSI_STCR_TSCKP;
 121                 break;
 122         case SND_SOC_DAIFMT_NB_IF:
 123                 strcr ^= SSI_STCR_TFSI;
 124                 break;
 125         case SND_SOC_DAIFMT_NB_NF:
 126                 break;
 127         }
 128 
 129         /* DAI clock master masks */
 130         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 131         case SND_SOC_DAIFMT_CBM_CFM:
 132                 break;
 133         default:
 134                 /* Master mode not implemented, needs handling of clocks. */
 135                 return -EINVAL;
 136         }
 137 
 138         strcr |= SSI_STCR_TFEN0;
 139 
 140         if (ssi->flags & IMX_SSI_NET)
 141                 scr |= SSI_SCR_NET;
 142         if (ssi->flags & IMX_SSI_SYN)
 143                 scr |= SSI_SCR_SYN;
 144 
 145         writel(strcr, ssi->base + SSI_STCR);
 146         writel(strcr, ssi->base + SSI_SRCR);
 147         writel(scr, ssi->base + SSI_SCR);
 148 
 149         return 0;
 150 }
 151 
 152 /*
 153  * SSI system clock configuration.
 154  * Should only be called when port is inactive (i.e. SSIEN = 0).
 155  */
 156 static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
 157                                   int clk_id, unsigned int freq, int dir)
 158 {
 159         struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
 160         u32 scr;
 161 
 162         scr = readl(ssi->base + SSI_SCR);
 163 
 164         switch (clk_id) {
 165         case IMX_SSP_SYS_CLK:
 166                 if (dir == SND_SOC_CLOCK_OUT)
 167                         scr |= SSI_SCR_SYS_CLK_EN;
 168                 else
 169                         scr &= ~SSI_SCR_SYS_CLK_EN;
 170                 break;
 171         default:
 172                 return -EINVAL;
 173         }
 174 
 175         writel(scr, ssi->base + SSI_SCR);
 176 
 177         return 0;
 178 }
 179 
 180 /*
 181  * SSI Clock dividers
 182  * Should only be called when port is inactive (i.e. SSIEN = 0).
 183  */
 184 static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
 185                                   int div_id, int div)
 186 {
 187         struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
 188         u32 stccr, srccr;
 189 
 190         stccr = readl(ssi->base + SSI_STCCR);
 191         srccr = readl(ssi->base + SSI_SRCCR);
 192 
 193         switch (div_id) {
 194         case IMX_SSI_TX_DIV_2:
 195                 stccr &= ~SSI_STCCR_DIV2;
 196                 stccr |= div;
 197                 break;
 198         case IMX_SSI_TX_DIV_PSR:
 199                 stccr &= ~SSI_STCCR_PSR;
 200                 stccr |= div;
 201                 break;
 202         case IMX_SSI_TX_DIV_PM:
 203                 stccr &= ~0xff;
 204                 stccr |= SSI_STCCR_PM(div);
 205                 break;
 206         case IMX_SSI_RX_DIV_2:
 207                 stccr &= ~SSI_STCCR_DIV2;
 208                 stccr |= div;
 209                 break;
 210         case IMX_SSI_RX_DIV_PSR:
 211                 stccr &= ~SSI_STCCR_PSR;
 212                 stccr |= div;
 213                 break;
 214         case IMX_SSI_RX_DIV_PM:
 215                 stccr &= ~0xff;
 216                 stccr |= SSI_STCCR_PM(div);
 217                 break;
 218         default:
 219                 return -EINVAL;
 220         }
 221 
 222         writel(stccr, ssi->base + SSI_STCCR);
 223         writel(srccr, ssi->base + SSI_SRCCR);
 224 
 225         return 0;
 226 }
 227 
 228 /*
 229  * Should only be called when port is inactive (i.e. SSIEN = 0),
 230  * although can be called multiple times by upper layers.
 231  */
 232 static int imx_ssi_hw_params(struct snd_pcm_substream *substream,
 233                              struct snd_pcm_hw_params *params,
 234                              struct snd_soc_dai *cpu_dai)
 235 {
 236         struct imx_ssi *ssi = snd_soc_dai_get_drvdata(cpu_dai);
 237         u32 reg, sccr;
 238 
 239         /* Tx/Rx config */
 240         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 241                 reg = SSI_STCCR;
 242         else
 243                 reg = SSI_SRCCR;
 244 
 245         if (ssi->flags & IMX_SSI_SYN)
 246                 reg = SSI_STCCR;
 247 
 248         sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;
 249 
 250         /* DAI data (word) size */
 251         switch (params_format(params)) {
 252         case SNDRV_PCM_FORMAT_S16_LE:
 253                 sccr |= SSI_SRCCR_WL(16);
 254                 break;
 255         case SNDRV_PCM_FORMAT_S20_3LE:
 256                 sccr |= SSI_SRCCR_WL(20);
 257                 break;
 258         case SNDRV_PCM_FORMAT_S24_LE:
 259                 sccr |= SSI_SRCCR_WL(24);
 260                 break;
 261         }
 262 
 263         writel(sccr, ssi->base + reg);
 264 
 265         return 0;
 266 }
 267 
 268 static int imx_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
 269                 struct snd_soc_dai *dai)
 270 {
 271         struct imx_ssi *ssi = snd_soc_dai_get_drvdata(dai);
 272         unsigned int sier_bits, sier;
 273         unsigned int scr;
 274 
 275         scr = readl(ssi->base + SSI_SCR);
 276         sier = readl(ssi->base + SSI_SIER);
 277 
 278         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 279                 if (ssi->flags & IMX_SSI_DMA)
 280                         sier_bits = SSI_SIER_TDMAE;
 281                 else
 282                         sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN;
 283         } else {
 284                 if (ssi->flags & IMX_SSI_DMA)
 285                         sier_bits = SSI_SIER_RDMAE;
 286                 else
 287                         sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN;
 288         }
 289 
 290         switch (cmd) {
 291         case SNDRV_PCM_TRIGGER_START:
 292         case SNDRV_PCM_TRIGGER_RESUME:
 293         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 294                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 295                         scr |= SSI_SCR_TE;
 296                 else
 297                         scr |= SSI_SCR_RE;
 298                 sier |= sier_bits;
 299 
 300                 scr |= SSI_SCR_SSIEN;
 301 
 302                 break;
 303 
 304         case SNDRV_PCM_TRIGGER_STOP:
 305         case SNDRV_PCM_TRIGGER_SUSPEND:
 306         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 307                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 308                         scr &= ~SSI_SCR_TE;
 309                 else
 310                         scr &= ~SSI_SCR_RE;
 311                 sier &= ~sier_bits;
 312 
 313                 if (!(scr & (SSI_SCR_TE | SSI_SCR_RE)))
 314                         scr &= ~SSI_SCR_SSIEN;
 315 
 316                 break;
 317         default:
 318                 return -EINVAL;
 319         }
 320 
 321         if (!(ssi->flags & IMX_SSI_USE_AC97))
 322                 /* rx/tx are always enabled to access ac97 registers */
 323                 writel(scr, ssi->base + SSI_SCR);
 324 
 325         writel(sier, ssi->base + SSI_SIER);
 326 
 327         return 0;
 328 }
 329 
 330 static const struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {
 331         .hw_params      = imx_ssi_hw_params,
 332         .set_fmt        = imx_ssi_set_dai_fmt,
 333         .set_clkdiv     = imx_ssi_set_dai_clkdiv,
 334         .set_sysclk     = imx_ssi_set_dai_sysclk,
 335         .set_tdm_slot   = imx_ssi_set_dai_tdm_slot,
 336         .trigger        = imx_ssi_trigger,
 337 };
 338 
 339 static int imx_ssi_dai_probe(struct snd_soc_dai *dai)
 340 {
 341         struct imx_ssi *ssi = dev_get_drvdata(dai->dev);
 342         uint32_t val;
 343 
 344         snd_soc_dai_set_drvdata(dai, ssi);
 345 
 346         val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.maxburst) |
 347                 SSI_SFCSR_RFWM0(ssi->dma_params_rx.maxburst);
 348         writel(val, ssi->base + SSI_SFCSR);
 349 
 350         /* Tx/Rx config */
 351         dai->playback_dma_data = &ssi->dma_params_tx;
 352         dai->capture_dma_data = &ssi->dma_params_rx;
 353 
 354         return 0;
 355 }
 356 
 357 static struct snd_soc_dai_driver imx_ssi_dai = {
 358         .probe = imx_ssi_dai_probe,
 359         .playback = {
 360                 .channels_min = 1,
 361                 .channels_max = 2,
 362                 .rates = SNDRV_PCM_RATE_8000_96000,
 363                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 364         },
 365         .capture = {
 366                 .channels_min = 1,
 367                 .channels_max = 2,
 368                 .rates = SNDRV_PCM_RATE_8000_96000,
 369                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 370         },
 371         .ops = &imx_ssi_pcm_dai_ops,
 372 };
 373 
 374 static struct snd_soc_dai_driver imx_ac97_dai = {
 375         .probe = imx_ssi_dai_probe,
 376         .bus_control = true,
 377         .playback = {
 378                 .stream_name = "AC97 Playback",
 379                 .channels_min = 2,
 380                 .channels_max = 2,
 381                 .rates = SNDRV_PCM_RATE_8000_48000,
 382                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 383         },
 384         .capture = {
 385                 .stream_name = "AC97 Capture",
 386                 .channels_min = 2,
 387                 .channels_max = 2,
 388                 .rates = SNDRV_PCM_RATE_48000,
 389                 .formats = SNDRV_PCM_FMTBIT_S16_LE,
 390         },
 391         .ops = &imx_ssi_pcm_dai_ops,
 392 };
 393 
 394 static const struct snd_soc_component_driver imx_component = {
 395         .name           = DRV_NAME,
 396 };
 397 
 398 static void setup_channel_to_ac97(struct imx_ssi *imx_ssi)
 399 {
 400         void __iomem *base = imx_ssi->base;
 401 
 402         writel(0x0, base + SSI_SCR);
 403         writel(0x0, base + SSI_STCR);
 404         writel(0x0, base + SSI_SRCR);
 405 
 406         writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR);
 407 
 408         writel(SSI_SFCSR_RFWM0(8) |
 409                 SSI_SFCSR_TFWM0(8) |
 410                 SSI_SFCSR_RFWM1(8) |
 411                 SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);
 412 
 413         writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR);
 414         writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR);
 415 
 416         writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR);
 417         writel(SSI_SOR_WAIT(3), base + SSI_SOR);
 418 
 419         writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN |
 420                         SSI_SCR_TE | SSI_SCR_RE,
 421                         base + SSI_SCR);
 422 
 423         writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
 424         writel(0xff, base + SSI_SACCDIS);
 425         writel(0x300, base + SSI_SACCEN);
 426 }
 427 
 428 static struct imx_ssi *ac97_ssi;
 429 
 430 static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
 431                 unsigned short val)
 432 {
 433         struct imx_ssi *imx_ssi = ac97_ssi;
 434         void __iomem *base = imx_ssi->base;
 435         unsigned int lreg;
 436         unsigned int lval;
 437 
 438         if (reg > 0x7f)
 439                 return;
 440 
 441         pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
 442 
 443         lreg = reg <<  12;
 444         writel(lreg, base + SSI_SACADD);
 445 
 446         lval = val << 4;
 447         writel(lval , base + SSI_SACDAT);
 448 
 449         writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT);
 450         udelay(100);
 451 }
 452 
 453 static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,
 454                 unsigned short reg)
 455 {
 456         struct imx_ssi *imx_ssi = ac97_ssi;
 457         void __iomem *base = imx_ssi->base;
 458 
 459         unsigned short val = -1;
 460         unsigned int lreg;
 461 
 462         lreg = (reg & 0x7f) <<  12 ;
 463         writel(lreg, base + SSI_SACADD);
 464         writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT);
 465 
 466         udelay(100);
 467 
 468         val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;
 469 
 470         pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
 471 
 472         return val;
 473 }
 474 
 475 static void imx_ssi_ac97_reset(struct snd_ac97 *ac97)
 476 {
 477         struct imx_ssi *imx_ssi = ac97_ssi;
 478 
 479         if (imx_ssi->ac97_reset)
 480                 imx_ssi->ac97_reset(ac97);
 481         /* First read sometimes fails, do a dummy read */
 482         imx_ssi_ac97_read(ac97, 0);
 483 }
 484 
 485 static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97)
 486 {
 487         struct imx_ssi *imx_ssi = ac97_ssi;
 488 
 489         if (imx_ssi->ac97_warm_reset)
 490                 imx_ssi->ac97_warm_reset(ac97);
 491 
 492         /* First read sometimes fails, do a dummy read */
 493         imx_ssi_ac97_read(ac97, 0);
 494 }
 495 
 496 static struct snd_ac97_bus_ops imx_ssi_ac97_ops = {
 497         .read           = imx_ssi_ac97_read,
 498         .write          = imx_ssi_ac97_write,
 499         .reset          = imx_ssi_ac97_reset,
 500         .warm_reset     = imx_ssi_ac97_warm_reset
 501 };
 502 
 503 static int imx_ssi_probe(struct platform_device *pdev)
 504 {
 505         struct resource *res;
 506         struct imx_ssi *ssi;
 507         struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
 508         int ret = 0;
 509         struct snd_soc_dai_driver *dai;
 510 
 511         ssi = devm_kzalloc(&pdev->dev, sizeof(*ssi), GFP_KERNEL);
 512         if (!ssi)
 513                 return -ENOMEM;
 514         dev_set_drvdata(&pdev->dev, ssi);
 515 
 516         if (pdata) {
 517                 ssi->ac97_reset = pdata->ac97_reset;
 518                 ssi->ac97_warm_reset = pdata->ac97_warm_reset;
 519                 ssi->flags = pdata->flags;
 520         }
 521 
 522         ssi->irq = platform_get_irq(pdev, 0);
 523         if (ssi->irq < 0)
 524                 return ssi->irq;
 525 
 526         ssi->clk = devm_clk_get(&pdev->dev, NULL);
 527         if (IS_ERR(ssi->clk)) {
 528                 ret = PTR_ERR(ssi->clk);
 529                 dev_err(&pdev->dev, "Cannot get the clock: %d\n",
 530                         ret);
 531                 goto failed_clk;
 532         }
 533         ret = clk_prepare_enable(ssi->clk);
 534         if (ret)
 535                 goto failed_clk;
 536 
 537         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 538         ssi->base = devm_ioremap_resource(&pdev->dev, res);
 539         if (IS_ERR(ssi->base)) {
 540                 ret = PTR_ERR(ssi->base);
 541                 goto failed_register;
 542         }
 543 
 544         if (ssi->flags & IMX_SSI_USE_AC97) {
 545                 if (ac97_ssi) {
 546                         dev_err(&pdev->dev, "AC'97 SSI already registered\n");
 547                         ret = -EBUSY;
 548                         goto failed_register;
 549                 }
 550                 ac97_ssi = ssi;
 551                 setup_channel_to_ac97(ssi);
 552                 dai = &imx_ac97_dai;
 553         } else
 554                 dai = &imx_ssi_dai;
 555 
 556         writel(0x0, ssi->base + SSI_SIER);
 557 
 558         ssi->dma_params_rx.addr = res->start + SSI_SRX0;
 559         ssi->dma_params_tx.addr = res->start + SSI_STX0;
 560 
 561         ssi->dma_params_tx.maxburst = 6;
 562         ssi->dma_params_rx.maxburst = 4;
 563 
 564         ssi->dma_params_tx.filter_data = &ssi->filter_data_tx;
 565         ssi->dma_params_rx.filter_data = &ssi->filter_data_rx;
 566 
 567         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
 568         if (res) {
 569                 imx_pcm_dma_params_init_data(&ssi->filter_data_tx, res->start,
 570                         IMX_DMATYPE_SSI);
 571         }
 572 
 573         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
 574         if (res) {
 575                 imx_pcm_dma_params_init_data(&ssi->filter_data_rx, res->start,
 576                         IMX_DMATYPE_SSI);
 577         }
 578 
 579         platform_set_drvdata(pdev, ssi);
 580 
 581         ret = snd_soc_set_ac97_ops(&imx_ssi_ac97_ops);
 582         if (ret != 0) {
 583                 dev_err(&pdev->dev, "Failed to set AC'97 ops: %d\n", ret);
 584                 goto failed_register;
 585         }
 586 
 587         ret = snd_soc_register_component(&pdev->dev, &imx_component,
 588                                          dai, 1);
 589         if (ret) {
 590                 dev_err(&pdev->dev, "register DAI failed\n");
 591                 goto failed_register;
 592         }
 593 
 594         ssi->fiq_params.irq = ssi->irq;
 595         ssi->fiq_params.base = ssi->base;
 596         ssi->fiq_params.dma_params_rx = &ssi->dma_params_rx;
 597         ssi->fiq_params.dma_params_tx = &ssi->dma_params_tx;
 598 
 599         ssi->fiq_init = imx_pcm_fiq_init(pdev, &ssi->fiq_params);
 600         ssi->dma_init = imx_pcm_dma_init(pdev, IMX_SSI_DMABUF_SIZE);
 601 
 602         if (ssi->fiq_init && ssi->dma_init) {
 603                 ret = ssi->fiq_init;
 604                 goto failed_pcm;
 605         }
 606 
 607         return 0;
 608 
 609 failed_pcm:
 610         snd_soc_unregister_component(&pdev->dev);
 611 failed_register:
 612         clk_disable_unprepare(ssi->clk);
 613 failed_clk:
 614         snd_soc_set_ac97_ops(NULL);
 615 
 616         return ret;
 617 }
 618 
 619 static int imx_ssi_remove(struct platform_device *pdev)
 620 {
 621         struct imx_ssi *ssi = platform_get_drvdata(pdev);
 622 
 623         if (!ssi->fiq_init)
 624                 imx_pcm_fiq_exit(pdev);
 625 
 626         snd_soc_unregister_component(&pdev->dev);
 627 
 628         if (ssi->flags & IMX_SSI_USE_AC97)
 629                 ac97_ssi = NULL;
 630 
 631         clk_disable_unprepare(ssi->clk);
 632         snd_soc_set_ac97_ops(NULL);
 633 
 634         return 0;
 635 }
 636 
 637 static struct platform_driver imx_ssi_driver = {
 638         .probe = imx_ssi_probe,
 639         .remove = imx_ssi_remove,
 640 
 641         .driver = {
 642                 .name = "imx-ssi",
 643         },
 644 };
 645 
 646 module_platform_driver(imx_ssi_driver);
 647 
 648 /* Module information */
 649 MODULE_AUTHOR("Sascha Hauer, <s.hauer@pengutronix.de>");
 650 MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface");
 651 MODULE_LICENSE("GPL");
 652 MODULE_ALIAS("platform:imx-ssi");