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   1 /*
   2  * Driver for Atmel AC97C
   3  *
   4  * Copyright (C) 2005-2009 Atmel Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  */
  10 #include <linux/clk.h>
  11 #include <linux/delay.h>
  12 #include <linux/bitmap.h>
  13 #include <linux/device.h>
  14 #include <linux/dmaengine.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/atmel_pdc.h>
  17 #include <linux/init.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/mutex.h>
  22 #include <linux/gpio.h>
  23 #include <linux/io.h>
  24
  25 #include <sound/core.h>
  26 #include <sound/initval.h>
  27 #include <sound/pcm.h>
  28 #include <sound/pcm_params.h>
  29 #include <sound/ac97_codec.h>
  30 #include <sound/atmel-ac97c.h>
  31 #include <sound/memalloc.h>
  32
  33 #include <linux/dw_dmac.h>
  34
  35 #include <mach/cpu.h>
  36 #include <mach/hardware.h>
  37 #include <mach/gpio.h>
  38
  39 #include "ac97c.h"
  40
  41 enum {
  42         DMA_TX_READY = 0,
  43         DMA_RX_READY,
  44         DMA_TX_CHAN_PRESENT,
  45         DMA_RX_CHAN_PRESENT,
  46 };
  47
  48 /* Serialize access to opened variable */
  49 static DEFINE_MUTEX(opened_mutex);
  50
  51 struct atmel_ac97c_dma {
  52         struct dma_chan                 *rx_chan;
  53         struct dma_chan                 *tx_chan;
  54 };
  55
  56 struct atmel_ac97c {
  57         struct clk                      *pclk;
  58         struct platform_device          *pdev;
  59         struct atmel_ac97c_dma          dma;
  60
  61         struct snd_pcm_substream        *playback_substream;
  62         struct snd_pcm_substream        *capture_substream;
  63         struct snd_card                 *card;
  64         struct snd_pcm                  *pcm;
  65         struct snd_ac97                 *ac97;
  66         struct snd_ac97_bus             *ac97_bus;
  67
  68         u64                             cur_format;
  69         unsigned int                    cur_rate;
  70         unsigned long                   flags;
  71         int                             playback_period, capture_period;
  72         /* Serialize access to opened variable */
  73         spinlock_t                      lock;
  74         void __iomem                    *regs;
  75         int                             irq;
  76         int                             opened;
  77         int                             reset_pin;
  78 };
  79
  80 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
  81
  82 #define ac97c_writel(chip, reg, val)                    \
  83         __raw_writel((val), (chip)->regs + AC97C_##reg)
  84 #define ac97c_readl(chip, reg)                          \
  85         __raw_readl((chip)->regs + AC97C_##reg)
  86
  87 /* This function is called by the DMA driver. */
  88 static void atmel_ac97c_dma_playback_period_done(void *arg)
  89 {
  90         struct atmel_ac97c *chip = arg;
  91         snd_pcm_period_elapsed(chip->playback_substream);
  92 }
  93
  94 static void atmel_ac97c_dma_capture_period_done(void *arg)
  95 {
  96         struct atmel_ac97c *chip = arg;
  97         snd_pcm_period_elapsed(chip->capture_substream);
  98 }
  99
 100 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
 101                 struct snd_pcm_substream *substream,
 102                 enum dma_data_direction direction)
 103 {
 104         struct dma_chan                 *chan;
 105         struct dw_cyclic_desc           *cdesc;
 106         struct snd_pcm_runtime          *runtime = substream->runtime;
 107         unsigned long                   buffer_len, period_len;
 108
 109         /*
 110          * We don't do DMA on "complex" transfers, i.e. with
 111          * non-halfword-aligned buffers or lengths.
 112          */
 113         if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
 114                 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
 115                 return -EINVAL;
 116         }
 117
 118         if (direction == DMA_TO_DEVICE)
 119                 chan = chip->dma.tx_chan;
 120         else
 121                 chan = chip->dma.rx_chan;
 122
 123         buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
 124         period_len = frames_to_bytes(runtime, runtime->period_size);
 125
 126         cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
 127                         period_len, direction);
 128         if (IS_ERR(cdesc)) {
 129                 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
 130                 return PTR_ERR(cdesc);
 131         }
 132
 133         if (direction == DMA_TO_DEVICE) {
 134                 cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
 135                 set_bit(DMA_TX_READY, &chip->flags);
 136         } else {
 137                 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
 138                 set_bit(DMA_RX_READY, &chip->flags);
 139         }
 140
 141         cdesc->period_callback_param = chip;
 142
 143         return 0;
 144 }
 145
 146 static struct snd_pcm_hardware atmel_ac97c_hw = {
 147         .info                   = (SNDRV_PCM_INFO_MMAP
 148                                   | SNDRV_PCM_INFO_MMAP_VALID
 149                                   | SNDRV_PCM_INFO_INTERLEAVED
 150                                   | SNDRV_PCM_INFO_BLOCK_TRANSFER
 151                                   | SNDRV_PCM_INFO_JOINT_DUPLEX
 152                                   | SNDRV_PCM_INFO_RESUME
 153                                   | SNDRV_PCM_INFO_PAUSE),
 154         .formats                = (SNDRV_PCM_FMTBIT_S16_BE
 155                                   | SNDRV_PCM_FMTBIT_S16_LE),
 156         .rates                  = (SNDRV_PCM_RATE_CONTINUOUS),
 157         .rate_min               = 4000,
 158         .rate_max               = 48000,
 159         .channels_min           = 1,
 160         .channels_max           = 2,
 161         .buffer_bytes_max       = 2 * 2 * 64 * 2048,
 162         .period_bytes_min       = 4096,
 163         .period_bytes_max       = 4096,
 164         .periods_min            = 6,
 165         .periods_max            = 64,
 166 };
 167
 168 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
 169 {
 170         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 171         struct snd_pcm_runtime *runtime = substream->runtime;
 172
 173         mutex_lock(&opened_mutex);
 174         chip->opened++;
 175         runtime->hw = atmel_ac97c_hw;
 176         if (chip->cur_rate) {
 177                 runtime->hw.rate_min = chip->cur_rate;
 178                 runtime->hw.rate_max = chip->cur_rate;
 179         }
 180         if (chip->cur_format)
 181                 runtime->hw.formats = (1ULL << chip->cur_format);
 182         mutex_unlock(&opened_mutex);
 183         chip->playback_substream = substream;
 184         return 0;
 185 }
 186
 187 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
 188 {
 189         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 190         struct snd_pcm_runtime *runtime = substream->runtime;
 191
 192         mutex_lock(&opened_mutex);
 193         chip->opened++;
 194         runtime->hw = atmel_ac97c_hw;
 195         if (chip->cur_rate) {
 196                 runtime->hw.rate_min = chip->cur_rate;
 197                 runtime->hw.rate_max = chip->cur_rate;
 198         }
 199         if (chip->cur_format)
 200                 runtime->hw.formats = (1ULL << chip->cur_format);
 201         mutex_unlock(&opened_mutex);
 202         chip->capture_substream = substream;
 203         return 0;
 204 }
 205
 206 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
 207 {
 208         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 209
 210         mutex_lock(&opened_mutex);
 211         chip->opened--;
 212         if (!chip->opened) {
 213                 chip->cur_rate = 0;
 214                 chip->cur_format = 0;
 215         }
 216         mutex_unlock(&opened_mutex);
 217
 218         chip->playback_substream = NULL;
 219
 220         return 0;
 221 }
 222
 223 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
 224 {
 225         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 226
 227         mutex_lock(&opened_mutex);
 228         chip->opened--;
 229         if (!chip->opened) {
 230                 chip->cur_rate = 0;
 231                 chip->cur_format = 0;
 232         }
 233         mutex_unlock(&opened_mutex);
 234
 235         chip->capture_substream = NULL;
 236
 237         return 0;
 238 }
 239
 240 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
 241                 struct snd_pcm_hw_params *hw_params)
 242 {
 243         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 244         int retval;
 245
 246         retval = snd_pcm_lib_malloc_pages(substream,
 247                                         params_buffer_bytes(hw_params));
 248         if (retval < 0)
 249                 return retval;
 250         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 251         if (cpu_is_at32ap7000()) {
 252                 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 253                 if (retval == 1)
 254                         if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
 255                                 dw_dma_cyclic_free(chip->dma.tx_chan);
 256         }
 257         /* Set restrictions to params. */
 258         mutex_lock(&opened_mutex);
 259         chip->cur_rate = params_rate(hw_params);
 260         chip->cur_format = params_format(hw_params);
 261         mutex_unlock(&opened_mutex);
 262
 263         return retval;
 264 }
 265
 266 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
 267                 struct snd_pcm_hw_params *hw_params)
 268 {
 269         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 270         int retval;
 271
 272         retval = snd_pcm_lib_malloc_pages(substream,
 273                                         params_buffer_bytes(hw_params));
 274         if (retval < 0)
 275                 return retval;
 276         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 277         if (cpu_is_at32ap7000()) {
 278                 if (retval < 0)
 279                         return retval;
 280                 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 281                 if (retval == 1)
 282                         if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
 283                                 dw_dma_cyclic_free(chip->dma.rx_chan);
 284         }
 285
 286         /* Set restrictions to params. */
 287         mutex_lock(&opened_mutex);
 288         chip->cur_rate = params_rate(hw_params);
 289         chip->cur_format = params_format(hw_params);
 290         mutex_unlock(&opened_mutex);
 291
 292         return retval;
 293 }
 294
 295 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
 296 {
 297         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 298         if (cpu_is_at32ap7000()) {
 299                 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
 300                         dw_dma_cyclic_free(chip->dma.tx_chan);
 301         }
 302         return snd_pcm_lib_free_pages(substream);
 303 }
 304
 305 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
 306 {
 307         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 308         if (cpu_is_at32ap7000()) {
 309                 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
 310                         dw_dma_cyclic_free(chip->dma.rx_chan);
 311         }
 312         return snd_pcm_lib_free_pages(substream);
 313 }
 314
 315 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
 316 {
 317         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 318         struct snd_pcm_runtime *runtime = substream->runtime;
 319         int block_size = frames_to_bytes(runtime, runtime->period_size);
 320         unsigned long word = ac97c_readl(chip, OCA);
 321         int retval;
 322
 323         chip->playback_period = 0;
 324         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 325
 326         /* assign channels to AC97C channel A */
 327         switch (runtime->channels) {
 328         case 1:
 329                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 330                 break;
 331         case 2:
 332                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 333                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 334                 break;
 335         default:
 336                 /* TODO: support more than two channels */
 337                 return -EINVAL;
 338         }
 339         ac97c_writel(chip, OCA, word);
 340
 341         /* configure sample format and size */
 342         word = ac97c_readl(chip, CAMR);
 343         if (chip->opened <= 1)
 344                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 345         else
 346                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 347
 348         switch (runtime->format) {
 349         case SNDRV_PCM_FORMAT_S16_LE:
 350                 if (cpu_is_at32ap7000())
 351                         word |= AC97C_CMR_CEM_LITTLE;
 352                 break;
 353         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
 354                 word &= ~(AC97C_CMR_CEM_LITTLE);
 355                 break;
 356         default:
 357                 word = ac97c_readl(chip, OCA);
 358                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 359                 ac97c_writel(chip, OCA, word);
 360                 return -EINVAL;
 361         }
 362
 363         /* Enable underrun interrupt on channel A */
 364         word |= AC97C_CSR_UNRUN;
 365
 366         ac97c_writel(chip, CAMR, word);
 367
 368         /* Enable channel A event interrupt */
 369         word = ac97c_readl(chip, IMR);
 370         word |= AC97C_SR_CAEVT;
 371         ac97c_writel(chip, IER, word);
 372
 373         /* set variable rate if needed */
 374         if (runtime->rate != 48000) {
 375                 word = ac97c_readl(chip, MR);
 376                 word |= AC97C_MR_VRA;
 377                 ac97c_writel(chip, MR, word);
 378         } else {
 379                 word = ac97c_readl(chip, MR);
 380                 word &= ~(AC97C_MR_VRA);
 381                 ac97c_writel(chip, MR, word);
 382         }
 383
 384         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
 385                         runtime->rate);
 386         if (retval)
 387                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 388                                 runtime->rate);
 389
 390         if (cpu_is_at32ap7000()) {
 391                 if (!test_bit(DMA_TX_READY, &chip->flags))
 392                         retval = atmel_ac97c_prepare_dma(chip, substream,
 393                                         DMA_TO_DEVICE);
 394         } else {
 395                 /* Initialize and start the PDC */
 396                 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
 397                 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
 398                 writel(runtime->dma_addr + block_size,
 399                                 chip->regs + ATMEL_PDC_TNPR);
 400                 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
 401         }
 402
 403         return retval;
 404 }
 405
 406 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
 407 {
 408         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 409         struct snd_pcm_runtime *runtime = substream->runtime;
 410         int block_size = frames_to_bytes(runtime, runtime->period_size);
 411         unsigned long word = ac97c_readl(chip, ICA);
 412         int retval;
 413
 414         chip->capture_period = 0;
 415         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 416
 417         /* assign channels to AC97C channel A */
 418         switch (runtime->channels) {
 419         case 1:
 420                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 421                 break;
 422         case 2:
 423                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 424                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 425                 break;
 426         default:
 427                 /* TODO: support more than two channels */
 428                 return -EINVAL;
 429         }
 430         ac97c_writel(chip, ICA, word);
 431
 432         /* configure sample format and size */
 433         word = ac97c_readl(chip, CAMR);
 434         if (chip->opened <= 1)
 435                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 436         else
 437                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 438
 439         switch (runtime->format) {
 440         case SNDRV_PCM_FORMAT_S16_LE:
 441                 if (cpu_is_at32ap7000())
 442                         word |= AC97C_CMR_CEM_LITTLE;
 443                 break;
 444         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
 445                 word &= ~(AC97C_CMR_CEM_LITTLE);
 446                 break;
 447         default:
 448                 word = ac97c_readl(chip, ICA);
 449                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 450                 ac97c_writel(chip, ICA, word);
 451                 return -EINVAL;
 452         }
 453
 454         /* Enable overrun interrupt on channel A */
 455         word |= AC97C_CSR_OVRUN;
 456
 457         ac97c_writel(chip, CAMR, word);
 458
 459         /* Enable channel A event interrupt */
 460         word = ac97c_readl(chip, IMR);
 461         word |= AC97C_SR_CAEVT;
 462         ac97c_writel(chip, IER, word);
 463
 464         /* set variable rate if needed */
 465         if (runtime->rate != 48000) {
 466                 word = ac97c_readl(chip, MR);
 467                 word |= AC97C_MR_VRA;
 468                 ac97c_writel(chip, MR, word);
 469         } else {
 470                 word = ac97c_readl(chip, MR);
 471                 word &= ~(AC97C_MR_VRA);
 472                 ac97c_writel(chip, MR, word);
 473         }
 474
 475         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
 476                         runtime->rate);
 477         if (retval)
 478                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 479                                 runtime->rate);
 480
 481         if (cpu_is_at32ap7000()) {
 482                 if (!test_bit(DMA_RX_READY, &chip->flags))
 483                         retval = atmel_ac97c_prepare_dma(chip, substream,
 484                                         DMA_FROM_DEVICE);
 485         } else {
 486                 /* Initialize and start the PDC */
 487                 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
 488                 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
 489                 writel(runtime->dma_addr + block_size,
 490                                 chip->regs + ATMEL_PDC_RNPR);
 491                 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
 492         }
 493
 494         return retval;
 495 }
 496
 497 static int
 498 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 499 {
 500         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 501         unsigned long camr, ptcr = 0;
 502         int retval = 0;
 503
 504         camr = ac97c_readl(chip, CAMR);
 505
 506         switch (cmd) {
 507         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 508         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 509         case SNDRV_PCM_TRIGGER_START:
 510                 if (cpu_is_at32ap7000()) {
 511                         retval = dw_dma_cyclic_start(chip->dma.tx_chan);
 512                         if (retval)
 513                                 goto out;
 514                 } else {
 515                         ptcr = ATMEL_PDC_TXTEN;
 516                 }
 517                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
 518                 break;
 519         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 520         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 521         case SNDRV_PCM_TRIGGER_STOP:
 522                 if (cpu_is_at32ap7000())
 523                         dw_dma_cyclic_stop(chip->dma.tx_chan);
 524                 else
 525                         ptcr |= ATMEL_PDC_TXTDIS;
 526                 if (chip->opened <= 1)
 527                         camr &= ~AC97C_CMR_CENA;
 528                 break;
 529         default:
 530                 retval = -EINVAL;
 531                 goto out;
 532         }
 533
 534         ac97c_writel(chip, CAMR, camr);
 535         if (!cpu_is_at32ap7000())
 536                 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 537 out:
 538         return retval;
 539 }
 540
 541 static int
 542 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 543 {
 544         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 545         unsigned long camr, ptcr = 0;
 546         int retval = 0;
 547
 548         camr = ac97c_readl(chip, CAMR);
 549         ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
 550
 551         switch (cmd) {
 552         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 553         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 554         case SNDRV_PCM_TRIGGER_START:
 555                 if (cpu_is_at32ap7000()) {
 556                         retval = dw_dma_cyclic_start(chip->dma.rx_chan);
 557                         if (retval)
 558                                 goto out;
 559                 } else {
 560                         ptcr = ATMEL_PDC_RXTEN;
 561                 }
 562                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
 563                 break;
 564         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 565         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 566         case SNDRV_PCM_TRIGGER_STOP:
 567                 if (cpu_is_at32ap7000())
 568                         dw_dma_cyclic_stop(chip->dma.rx_chan);
 569                 else
 570                         ptcr |= (ATMEL_PDC_RXTDIS);
 571                 if (chip->opened <= 1)
 572                         camr &= ~AC97C_CMR_CENA;
 573                 break;
 574         default:
 575                 retval = -EINVAL;
 576                 break;
 577         }
 578
 579         ac97c_writel(chip, CAMR, camr);
 580         if (!cpu_is_at32ap7000())
 581                 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 582 out:
 583         return retval;
 584 }
 585
 586 static snd_pcm_uframes_t
 587 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
 588 {
 589         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 590         struct snd_pcm_runtime  *runtime = substream->runtime;
 591         snd_pcm_uframes_t       frames;
 592         unsigned long           bytes;
 593
 594         if (cpu_is_at32ap7000())
 595                 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
 596         else
 597                 bytes = readl(chip->regs + ATMEL_PDC_TPR);
 598         bytes -= runtime->dma_addr;
 599
 600         frames = bytes_to_frames(runtime, bytes);
 601         if (frames >= runtime->buffer_size)
 602                 frames -= runtime->buffer_size;
 603         return frames;
 604 }
 605
 606 static snd_pcm_uframes_t
 607 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
 608 {
 609         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 610         struct snd_pcm_runtime  *runtime = substream->runtime;
 611         snd_pcm_uframes_t       frames;
 612         unsigned long           bytes;
 613
 614         if (cpu_is_at32ap7000())
 615                 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
 616         else
 617                 bytes = readl(chip->regs + ATMEL_PDC_RPR);
 618         bytes -= runtime->dma_addr;
 619
 620         frames = bytes_to_frames(runtime, bytes);
 621         if (frames >= runtime->buffer_size)
 622                 frames -= runtime->buffer_size;
 623         return frames;
 624 }
 625
 626 static struct snd_pcm_ops atmel_ac97_playback_ops = {
 627         .open           = atmel_ac97c_playback_open,
 628         .close          = atmel_ac97c_playback_close,
 629         .ioctl          = snd_pcm_lib_ioctl,
 630         .hw_params      = atmel_ac97c_playback_hw_params,
 631         .hw_free        = atmel_ac97c_playback_hw_free,
 632         .prepare        = atmel_ac97c_playback_prepare,
 633         .trigger        = atmel_ac97c_playback_trigger,
 634         .pointer        = atmel_ac97c_playback_pointer,
 635 };
 636
 637 static struct snd_pcm_ops atmel_ac97_capture_ops = {
 638         .open           = atmel_ac97c_capture_open,
 639         .close          = atmel_ac97c_capture_close,
 640         .ioctl          = snd_pcm_lib_ioctl,
 641         .hw_params      = atmel_ac97c_capture_hw_params,
 642         .hw_free        = atmel_ac97c_capture_hw_free,
 643         .prepare        = atmel_ac97c_capture_prepare,
 644         .trigger        = atmel_ac97c_capture_trigger,
 645         .pointer        = atmel_ac97c_capture_pointer,
 646 };
 647
 648 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
 649 {
 650         struct atmel_ac97c      *chip  = (struct atmel_ac97c *)dev;
 651         irqreturn_t             retval = IRQ_NONE;
 652         u32                     sr     = ac97c_readl(chip, SR);
 653         u32                     casr   = ac97c_readl(chip, CASR);
 654         u32                     cosr   = ac97c_readl(chip, COSR);
 655         u32                     camr   = ac97c_readl(chip, CAMR);
 656
 657         if (sr & AC97C_SR_CAEVT) {
 658                 struct snd_pcm_runtime *runtime;
 659                 int offset, next_period, block_size;
 660                 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
 661                                 casr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
 662                                 casr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
 663                                 casr & AC97C_CSR_UNRUN   ? " UNRUN"   : "",
 664                                 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
 665                                 casr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
 666                                 !casr                    ? " NONE"    : "");
 667                 if (!cpu_is_at32ap7000()) {
 668                         if ((casr & camr) & AC97C_CSR_ENDTX) {
 669                                 runtime = chip->playback_substream->runtime;
 670                                 block_size = frames_to_bytes(runtime,
 671                                                 runtime->period_size);
 672                                 chip->playback_period++;
 673
 674                                 if (chip->playback_period == runtime->periods)
 675                                         chip->playback_period = 0;
 676                                 next_period = chip->playback_period + 1;
 677                                 if (next_period == runtime->periods)
 678                                         next_period = 0;
 679
 680                                 offset = block_size * next_period;
 681
 682                                 writel(runtime->dma_addr + offset,
 683                                                 chip->regs + ATMEL_PDC_TNPR);
 684                                 writel(block_size / 2,
 685                                                 chip->regs + ATMEL_PDC_TNCR);
 686
 687                                 snd_pcm_period_elapsed(
 688                                                 chip->playback_substream);
 689                         }
 690                         if ((casr & camr) & AC97C_CSR_ENDRX) {
 691                                 runtime = chip->capture_substream->runtime;
 692                                 block_size = frames_to_bytes(runtime,
 693                                                 runtime->period_size);
 694                                 chip->capture_period++;
 695
 696                                 if (chip->capture_period == runtime->periods)
 697                                         chip->capture_period = 0;
 698                                 next_period = chip->capture_period + 1;
 699                                 if (next_period == runtime->periods)
 700                                         next_period = 0;
 701
 702                                 offset = block_size * next_period;
 703
 704                                 writel(runtime->dma_addr + offset,
 705                                                 chip->regs + ATMEL_PDC_RNPR);
 706                                 writel(block_size / 2,
 707                                                 chip->regs + ATMEL_PDC_RNCR);
 708                                 snd_pcm_period_elapsed(chip->capture_substream);
 709                         }
 710                 }
 711                 retval = IRQ_HANDLED;
 712         }
 713
 714         if (sr & AC97C_SR_COEVT) {
 715                 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
 716                                 cosr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
 717                                 cosr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
 718                                 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
 719                                 cosr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
 720                                 !cosr                    ? " NONE"    : "");
 721                 retval = IRQ_HANDLED;
 722         }
 723
 724         if (retval == IRQ_NONE) {
 725                 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
 726                                 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
 727         }
 728
 729         return retval;
 730 }
 731
 732 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
 733         /* Playback */
 734         {
 735                 .exclusive = 1,
 736                 .r = { {
 737                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 738                                   | (1 << AC97_SLOT_PCM_RIGHT)),
 739                 } },
 740         },
 741         /* PCM in */
 742         {
 743                 .stream = 1,
 744                 .exclusive = 1,
 745                 .r = { {
 746                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 747                                         | (1 << AC97_SLOT_PCM_RIGHT)),
 748                 } }
 749         },
 750         /* Mic in */
 751         {
 752                 .stream = 1,
 753                 .exclusive = 1,
 754                 .r = { {
 755                         .slots = (1<<AC97_SLOT_MIC),
 756                 } }
 757         },
 758 };
 759
 760 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
 761 {
 762         struct snd_pcm          *pcm;
 763         struct snd_pcm_hardware hw = atmel_ac97c_hw;
 764         int                     capture, playback, retval, err;
 765
 766         capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
 767         playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
 768
 769         if (!cpu_is_at32ap7000()) {
 770                 err = snd_ac97_pcm_assign(chip->ac97_bus,
 771                                 ARRAY_SIZE(at91_ac97_pcm_defs),
 772                                 at91_ac97_pcm_defs);
 773                 if (err)
 774                         return err;
 775         }
 776         retval = snd_pcm_new(chip->card, chip->card->shortname,
 777                         chip->pdev->id, playback, capture, &pcm);
 778         if (retval)
 779                 return retval;
 780
 781         if (capture)
 782                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 783                                 &atmel_ac97_capture_ops);
 784         if (playback)
 785                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 786                                 &atmel_ac97_playback_ops);
 787
 788         retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 789                         &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
 790                         hw.buffer_bytes_max);
 791         if (retval)
 792                 return retval;
 793
 794         pcm->private_data = chip;
 795         pcm->info_flags = 0;
 796         strcpy(pcm->name, chip->card->shortname);
 797         chip->pcm = pcm;
 798
 799         return 0;
 800 }
 801
 802 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
 803 {
 804         struct snd_ac97_template template;
 805         memset(&template, 0, sizeof(template));
 806         template.private_data = chip;
 807         return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
 808 }
 809
 810 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
 811                 unsigned short val)
 812 {
 813         struct atmel_ac97c *chip = get_chip(ac97);
 814         unsigned long word;
 815         int timeout = 40;
 816
 817         word = (reg & 0x7f) << 16 | val;
 818
 819         do {
 820                 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
 821                         ac97c_writel(chip, COTHR, word);
 822                         return;
 823                 }
 824                 udelay(1);
 825         } while (--timeout);
 826
 827         dev_dbg(&chip->pdev->dev, "codec write timeout\n");
 828 }
 829
 830 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
 831                 unsigned short reg)
 832 {
 833         struct atmel_ac97c *chip = get_chip(ac97);
 834         unsigned long word;
 835         int timeout = 40;
 836         int write = 10;
 837
 838         word = (0x80 | (reg & 0x7f)) << 16;
 839
 840         if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
 841                 ac97c_readl(chip, CORHR);
 842
 843 retry_write:
 844         timeout = 40;
 845
 846         do {
 847                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
 848                         ac97c_writel(chip, COTHR, word);
 849                         goto read_reg;
 850                 }
 851                 udelay(10);
 852         } while (--timeout);
 853
 854         if (!--write)
 855                 goto timed_out;
 856         goto retry_write;
 857
 858 read_reg:
 859         do {
 860                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
 861                         unsigned short val = ac97c_readl(chip, CORHR);
 862                         return val;
 863                 }
 864                 udelay(10);
 865         } while (--timeout);
 866
 867         if (!--write)
 868                 goto timed_out;
 869         goto retry_write;
 870
 871 timed_out:
 872         dev_dbg(&chip->pdev->dev, "codec read timeout\n");
 873         return 0xffff;
 874 }
 875
 876 static bool filter(struct dma_chan *chan, void *slave)
 877 {
 878         struct dw_dma_slave *dws = slave;
 879
 880         if (dws->dma_dev == chan->device->dev) {
 881                 chan->private = dws;
 882                 return true;
 883         } else
 884                 return false;
 885 }
 886
 887 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
 888 {
 889         ac97c_writel(chip, MR,   0);
 890         ac97c_writel(chip, MR,   AC97C_MR_ENA);
 891         ac97c_writel(chip, CAMR, 0);
 892         ac97c_writel(chip, COMR, 0);
 893
 894         if (gpio_is_valid(chip->reset_pin)) {
 895                 gpio_set_value(chip->reset_pin, 0);
 896                 /* AC97 v2.2 specifications says minimum 1 us. */
 897                 udelay(2);
 898                 gpio_set_value(chip->reset_pin, 1);
 899         }
 900 }
 901
 902 static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
 903 {
 904         struct snd_card                 *card;
 905         struct atmel_ac97c              *chip;
 906         struct resource                 *regs;
 907         struct ac97c_platform_data      *pdata;
 908         struct clk                      *pclk;
 909         static struct snd_ac97_bus_ops  ops = {
 910                 .write  = atmel_ac97c_write,
 911                 .read   = atmel_ac97c_read,
 912         };
 913         int                             retval;
 914         int                             irq;
 915
 916         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 917         if (!regs) {
 918                 dev_dbg(&pdev->dev, "no memory resource\n");
 919                 return -ENXIO;
 920         }
 921
 922         pdata = pdev->dev.platform_data;
 923         if (!pdata) {
 924                 dev_dbg(&pdev->dev, "no platform data\n");
 925                 return -ENXIO;
 926         }
 927
 928         irq = platform_get_irq(pdev, 0);
 929         if (irq < 0) {
 930                 dev_dbg(&pdev->dev, "could not get irq\n");
 931                 return -ENXIO;
 932         }
 933
 934         if (cpu_is_at32ap7000()) {
 935                 pclk = clk_get(&pdev->dev, "pclk");
 936         } else {
 937                 pclk = clk_get(&pdev->dev, "ac97_clk");
 938         }
 939
 940         if (IS_ERR(pclk)) {
 941                 dev_dbg(&pdev->dev, "no peripheral clock\n");
 942                 return PTR_ERR(pclk);
 943         }
 944         clk_enable(pclk);
 945
 946         retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 947                         THIS_MODULE, sizeof(struct atmel_ac97c), &card);
 948         if (retval) {
 949                 dev_dbg(&pdev->dev, "could not create sound card device\n");
 950                 goto err_snd_card_new;
 951         }
 952
 953         chip = get_chip(card);
 954
 955         retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
 956         if (retval) {
 957                 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
 958                 goto err_request_irq;
 959         }
 960         chip->irq = irq;
 961
 962         spin_lock_init(&chip->lock);
 963
 964         strcpy(card->driver, "Atmel AC97C");
 965         strcpy(card->shortname, "Atmel AC97C");
 966         sprintf(card->longname, "Atmel AC97 controller");
 967
 968         chip->card = card;
 969         chip->pclk = pclk;
 970         chip->pdev = pdev;
 971         chip->regs = ioremap(regs->start, regs->end - regs->start + 1);
 972
 973         if (!chip->regs) {
 974                 dev_dbg(&pdev->dev, "could not remap register memory\n");
 975                 goto err_ioremap;
 976         }
 977
 978         if (gpio_is_valid(pdata->reset_pin)) {
 979                 if (gpio_request(pdata->reset_pin, "reset_pin")) {
 980                         dev_dbg(&pdev->dev, "reset pin not available\n");
 981                         chip->reset_pin = -ENODEV;
 982                 } else {
 983                         gpio_direction_output(pdata->reset_pin, 1);
 984                         chip->reset_pin = pdata->reset_pin;
 985                 }
 986         }
 987
 988         snd_card_set_dev(card, &pdev->dev);
 989
 990         atmel_ac97c_reset(chip);
 991
 992         /* Enable overrun interrupt from codec channel */
 993         ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
 994         ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
 995
 996         retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
 997         if (retval) {
 998                 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
 999                 goto err_ac97_bus;
1000         }
1001
1002         retval = atmel_ac97c_mixer_new(chip);
1003         if (retval) {
1004                 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1005                 goto err_ac97_bus;
1006         }
1007
1008         if (cpu_is_at32ap7000()) {
1009                 if (pdata->rx_dws.dma_dev) {
1010                         struct dw_dma_slave *dws = &pdata->rx_dws;
1011                         dma_cap_mask_t mask;
1012
1013                         dws->rx_reg = regs->start + AC97C_CARHR + 2;
1014
1015                         dma_cap_zero(mask);
1016                         dma_cap_set(DMA_SLAVE, mask);
1017
1018                         chip->dma.rx_chan = dma_request_channel(mask, filter,
1019                                                                 dws);
1020
1021                         dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1022                                 dev_name(&chip->dma.rx_chan->dev->device));
1023                         set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1024                 }
1025
1026                 if (pdata->tx_dws.dma_dev) {
1027                         struct dw_dma_slave *dws = &pdata->tx_dws;
1028                         dma_cap_mask_t mask;
1029
1030                         dws->tx_reg = regs->start + AC97C_CATHR + 2;
1031
1032                         dma_cap_zero(mask);
1033                         dma_cap_set(DMA_SLAVE, mask);
1034
1035                         chip->dma.tx_chan = dma_request_channel(mask, filter,
1036                                                                 dws);
1037
1038                         dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1039                                 dev_name(&chip->dma.tx_chan->dev->device));
1040                         set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1041                 }
1042
1043                 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1044                                 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1045                         dev_dbg(&pdev->dev, "DMA not available\n");
1046                         retval = -ENODEV;
1047                         goto err_dma;
1048                 }
1049         } else {
1050                 /* Just pretend that we have DMA channel(for at91 i is actually
1051                  * the PDC) */
1052                 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1053                 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1054         }
1055
1056         retval = atmel_ac97c_pcm_new(chip);
1057         if (retval) {
1058                 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1059                 goto err_dma;
1060         }
1061
1062         retval = snd_card_register(card);
1063         if (retval) {
1064                 dev_dbg(&pdev->dev, "could not register sound card\n");
1065                 goto err_dma;
1066         }
1067
1068         platform_set_drvdata(pdev, card);
1069
1070         dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1071                         chip->regs, irq);
1072
1073         return 0;
1074
1075 err_dma:
1076         if (cpu_is_at32ap7000()) {
1077                 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1078                         dma_release_channel(chip->dma.rx_chan);
1079                 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1080                         dma_release_channel(chip->dma.tx_chan);
1081                 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1082                 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1083                 chip->dma.rx_chan = NULL;
1084                 chip->dma.tx_chan = NULL;
1085         }
1086 err_ac97_bus:
1087         snd_card_set_dev(card, NULL);
1088
1089         if (gpio_is_valid(chip->reset_pin))
1090                 gpio_free(chip->reset_pin);
1091
1092         iounmap(chip->regs);
1093 err_ioremap:
1094         free_irq(irq, chip);
1095 err_request_irq:
1096         snd_card_free(card);
1097 err_snd_card_new:
1098         clk_disable(pclk);
1099         clk_put(pclk);
1100         return retval;
1101 }
1102
1103 #ifdef CONFIG_PM
1104 static int atmel_ac97c_suspend(struct platform_device *pdev, pm_message_t msg)
1105 {
1106         struct snd_card *card = platform_get_drvdata(pdev);
1107         struct atmel_ac97c *chip = card->private_data;
1108
1109         if (cpu_is_at32ap7000()) {
1110                 if (test_bit(DMA_RX_READY, &chip->flags))
1111                         dw_dma_cyclic_stop(chip->dma.rx_chan);
1112                 if (test_bit(DMA_TX_READY, &chip->flags))
1113                         dw_dma_cyclic_stop(chip->dma.tx_chan);
1114         }
1115         clk_disable(chip->pclk);
1116
1117         return 0;
1118 }
1119
1120 static int atmel_ac97c_resume(struct platform_device *pdev)
1121 {
1122         struct snd_card *card = platform_get_drvdata(pdev);
1123         struct atmel_ac97c *chip = card->private_data;
1124
1125         clk_enable(chip->pclk);
1126         if (cpu_is_at32ap7000()) {
1127                 if (test_bit(DMA_RX_READY, &chip->flags))
1128                         dw_dma_cyclic_start(chip->dma.rx_chan);
1129                 if (test_bit(DMA_TX_READY, &chip->flags))
1130                         dw_dma_cyclic_start(chip->dma.tx_chan);
1131         }
1132         return 0;
1133 }
1134 #else
1135 #define atmel_ac97c_suspend NULL
1136 #define atmel_ac97c_resume NULL
1137 #endif
1138
1139 static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
1140 {
1141         struct snd_card *card = platform_get_drvdata(pdev);
1142         struct atmel_ac97c *chip = get_chip(card);
1143
1144         if (gpio_is_valid(chip->reset_pin))
1145                 gpio_free(chip->reset_pin);
1146
1147         ac97c_writel(chip, CAMR, 0);
1148         ac97c_writel(chip, COMR, 0);
1149         ac97c_writel(chip, MR,   0);
1150
1151         clk_disable(chip->pclk);
1152         clk_put(chip->pclk);
1153         iounmap(chip->regs);
1154         free_irq(chip->irq, chip);
1155
1156         if (cpu_is_at32ap7000()) {
1157                 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1158                         dma_release_channel(chip->dma.rx_chan);
1159                 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1160                         dma_release_channel(chip->dma.tx_chan);
1161                 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1162                 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1163                 chip->dma.rx_chan = NULL;
1164                 chip->dma.tx_chan = NULL;
1165         }
1166
1167         snd_card_set_dev(card, NULL);
1168         snd_card_free(card);
1169
1170         platform_set_drvdata(pdev, NULL);
1171
1172         return 0;
1173 }
1174
1175 static struct platform_driver atmel_ac97c_driver = {
1176         .remove         = __devexit_p(atmel_ac97c_remove),
1177         .driver         = {
1178                 .name   = "atmel_ac97c",
1179         },
1180         .suspend        = atmel_ac97c_suspend,
1181         .resume         = atmel_ac97c_resume,
1182 };
1183
1184 static int __init atmel_ac97c_init(void)
1185 {
1186         return platform_driver_probe(&atmel_ac97c_driver,
1187                         atmel_ac97c_probe);
1188 }
1189 module_init(atmel_ac97c_init);
1190
1191 static void __exit atmel_ac97c_exit(void)
1192 {
1193         platform_driver_unregister(&atmel_ac97c_driver);
1194 }
1195 module_exit(atmel_ac97c_exit);
1196
1197 MODULE_LICENSE("GPL");
1198 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1199 MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");