sound/atmel/ac97c.c

   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/types.h>
  24 #include <linux/io.h>
  25
  26 #include <sound/core.h>
  27 #include <sound/initval.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/ac97_codec.h>
  31 #include <sound/atmel-ac97c.h>
  32 #include <sound/memalloc.h>
  33
  34 #include <linux/dw_dmac.h>
  35
  36 #include <mach/cpu.h>
  37 #include <mach/gpio.h>
  38
  39 #ifdef CONFIG_ARCH_AT91
  40 #include <mach/hardware.h>
  41 #endif
  42
  43 #include "ac97c.h"
  44
  45 enum {
  46         DMA_TX_READY = 0,
  47         DMA_RX_READY,
  48         DMA_TX_CHAN_PRESENT,
  49         DMA_RX_CHAN_PRESENT,
  50 };
  51
  52 /* Serialize access to opened variable */
  53 static DEFINE_MUTEX(opened_mutex);
  54
  55 struct atmel_ac97c_dma {
  56         struct dma_chan                 *rx_chan;
  57         struct dma_chan                 *tx_chan;
  58 };
  59
  60 struct atmel_ac97c {
  61         struct clk                      *pclk;
  62         struct platform_device          *pdev;
  63         struct atmel_ac97c_dma          dma;
  64
  65         struct snd_pcm_substream        *playback_substream;
  66         struct snd_pcm_substream        *capture_substream;
  67         struct snd_card                 *card;
  68         struct snd_pcm                  *pcm;
  69         struct snd_ac97                 *ac97;
  70         struct snd_ac97_bus             *ac97_bus;
  71
  72         u64                             cur_format;
  73         unsigned int                    cur_rate;
  74         unsigned long                   flags;
  75         int                             playback_period, capture_period;
  76         /* Serialize access to opened variable */
  77         spinlock_t                      lock;
  78         void __iomem                    *regs;
  79         int                             irq;
  80         int                             opened;
  81         int                             reset_pin;
  82 };
  83
  84 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
  85
  86 #define ac97c_writel(chip, reg, val)                    \
  87         __raw_writel((val), (chip)->regs + AC97C_##reg)
  88 #define ac97c_readl(chip, reg)                          \
  89         __raw_readl((chip)->regs + AC97C_##reg)
  90
  91 /* This function is called by the DMA driver. */
  92 static void atmel_ac97c_dma_playback_period_done(void *arg)
  93 {
  94         struct atmel_ac97c *chip = arg;
  95         snd_pcm_period_elapsed(chip->playback_substream);
  96 }
  97
  98 static void atmel_ac97c_dma_capture_period_done(void *arg)
  99 {
 100         struct atmel_ac97c *chip = arg;
 101         snd_pcm_period_elapsed(chip->capture_substream);
 102 }
 103
 104 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
 105                 struct snd_pcm_substream *substream,
 106                 enum dma_transfer_direction direction)
 107 {
 108         struct dma_chan                 *chan;
 109         struct dw_cyclic_desc           *cdesc;
 110         struct snd_pcm_runtime          *runtime = substream->runtime;
 111         unsigned long                   buffer_len, period_len;
 112
 113         /*
 114          * We don't do DMA on "complex" transfers, i.e. with
 115          * non-halfword-aligned buffers or lengths.
 116          */
 117         if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
 118                 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
 119                 return -EINVAL;
 120         }
 121
 122         if (direction == DMA_MEM_TO_DEV)
 123                 chan = chip->dma.tx_chan;
 124         else
 125                 chan = chip->dma.rx_chan;
 126
 127         buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
 128         period_len = frames_to_bytes(runtime, runtime->period_size);
 129
 130         cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
 131                         period_len, direction);
 132         if (IS_ERR(cdesc)) {
 133                 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
 134                 return PTR_ERR(cdesc);
 135         }
 136
 137         if (direction == DMA_MEM_TO_DEV) {
 138                 cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
 139                 set_bit(DMA_TX_READY, &chip->flags);
 140         } else {
 141                 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
 142                 set_bit(DMA_RX_READY, &chip->flags);
 143         }
 144
 145         cdesc->period_callback_param = chip;
 146
 147         return 0;
 148 }
 149
 150 static struct snd_pcm_hardware atmel_ac97c_hw = {
 151         .info                   = (SNDRV_PCM_INFO_MMAP
 152                                   | SNDRV_PCM_INFO_MMAP_VALID
 153                                   | SNDRV_PCM_INFO_INTERLEAVED
 154                                   | SNDRV_PCM_INFO_BLOCK_TRANSFER
 155                                   | SNDRV_PCM_INFO_JOINT_DUPLEX
 156                                   | SNDRV_PCM_INFO_RESUME
 157                                   | SNDRV_PCM_INFO_PAUSE),
 158         .formats                = (SNDRV_PCM_FMTBIT_S16_BE
 159                                   | SNDRV_PCM_FMTBIT_S16_LE),
 160         .rates                  = (SNDRV_PCM_RATE_CONTINUOUS),
 161         .rate_min               = 4000,
 162         .rate_max               = 48000,
 163         .channels_min           = 1,
 164         .channels_max           = 2,
 165         .buffer_bytes_max       = 2 * 2 * 64 * 2048,
 166         .period_bytes_min       = 4096,
 167         .period_bytes_max       = 4096,
 168         .periods_min            = 6,
 169         .periods_max            = 64,
 170 };
 171
 172 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
 173 {
 174         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 175         struct snd_pcm_runtime *runtime = substream->runtime;
 176
 177         mutex_lock(&opened_mutex);
 178         chip->opened++;
 179         runtime->hw = atmel_ac97c_hw;
 180         if (chip->cur_rate) {
 181                 runtime->hw.rate_min = chip->cur_rate;
 182                 runtime->hw.rate_max = chip->cur_rate;
 183         }
 184         if (chip->cur_format)
 185                 runtime->hw.formats = (1ULL << chip->cur_format);
 186         mutex_unlock(&opened_mutex);
 187         chip->playback_substream = substream;
 188         return 0;
 189 }
 190
 191 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
 192 {
 193         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 194         struct snd_pcm_runtime *runtime = substream->runtime;
 195
 196         mutex_lock(&opened_mutex);
 197         chip->opened++;
 198         runtime->hw = atmel_ac97c_hw;
 199         if (chip->cur_rate) {
 200                 runtime->hw.rate_min = chip->cur_rate;
 201                 runtime->hw.rate_max = chip->cur_rate;
 202         }
 203         if (chip->cur_format)
 204                 runtime->hw.formats = (1ULL << chip->cur_format);
 205         mutex_unlock(&opened_mutex);
 206         chip->capture_substream = substream;
 207         return 0;
 208 }
 209
 210 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
 211 {
 212         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 213
 214         mutex_lock(&opened_mutex);
 215         chip->opened--;
 216         if (!chip->opened) {
 217                 chip->cur_rate = 0;
 218                 chip->cur_format = 0;
 219         }
 220         mutex_unlock(&opened_mutex);
 221
 222         chip->playback_substream = NULL;
 223
 224         return 0;
 225 }
 226
 227 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
 228 {
 229         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 230
 231         mutex_lock(&opened_mutex);
 232         chip->opened--;
 233         if (!chip->opened) {
 234                 chip->cur_rate = 0;
 235                 chip->cur_format = 0;
 236         }
 237         mutex_unlock(&opened_mutex);
 238
 239         chip->capture_substream = NULL;
 240
 241         return 0;
 242 }
 243
 244 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
 245                 struct snd_pcm_hw_params *hw_params)
 246 {
 247         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 248         int retval;
 249
 250         retval = snd_pcm_lib_malloc_pages(substream,
 251                                         params_buffer_bytes(hw_params));
 252         if (retval < 0)
 253                 return retval;
 254         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 255         if (cpu_is_at32ap7000()) {
 256                 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 257                 if (retval == 1)
 258                         if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
 259                                 dw_dma_cyclic_free(chip->dma.tx_chan);
 260         }
 261         /* Set restrictions to params. */
 262         mutex_lock(&opened_mutex);
 263         chip->cur_rate = params_rate(hw_params);
 264         chip->cur_format = params_format(hw_params);
 265         mutex_unlock(&opened_mutex);
 266
 267         return retval;
 268 }
 269
 270 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
 271                 struct snd_pcm_hw_params *hw_params)
 272 {
 273         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 274         int retval;
 275
 276         retval = snd_pcm_lib_malloc_pages(substream,
 277                                         params_buffer_bytes(hw_params));
 278         if (retval < 0)
 279                 return retval;
 280         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 281         if (cpu_is_at32ap7000()) {
 282                 if (retval < 0)
 283                         return retval;
 284                 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 285                 if (retval == 1)
 286                         if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
 287                                 dw_dma_cyclic_free(chip->dma.rx_chan);
 288         }
 289
 290         /* Set restrictions to params. */
 291         mutex_lock(&opened_mutex);
 292         chip->cur_rate = params_rate(hw_params);
 293         chip->cur_format = params_format(hw_params);
 294         mutex_unlock(&opened_mutex);
 295
 296         return retval;
 297 }
 298
 299 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
 300 {
 301         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 302         if (cpu_is_at32ap7000()) {
 303                 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
 304                         dw_dma_cyclic_free(chip->dma.tx_chan);
 305         }
 306         return snd_pcm_lib_free_pages(substream);
 307 }
 308
 309 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
 310 {
 311         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 312         if (cpu_is_at32ap7000()) {
 313                 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
 314                         dw_dma_cyclic_free(chip->dma.rx_chan);
 315         }
 316         return snd_pcm_lib_free_pages(substream);
 317 }
 318
 319 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
 320 {
 321         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 322         struct snd_pcm_runtime *runtime = substream->runtime;
 323         int block_size = frames_to_bytes(runtime, runtime->period_size);
 324         unsigned long word = ac97c_readl(chip, OCA);
 325         int retval;
 326
 327         chip->playback_period = 0;
 328         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 329
 330         /* assign channels to AC97C channel A */
 331         switch (runtime->channels) {
 332         case 1:
 333                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 334                 break;
 335         case 2:
 336                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 337                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 338                 break;
 339         default:
 340                 /* TODO: support more than two channels */
 341                 return -EINVAL;
 342         }
 343         ac97c_writel(chip, OCA, word);
 344
 345         /* configure sample format and size */
 346         word = ac97c_readl(chip, CAMR);
 347         if (chip->opened <= 1)
 348                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 349         else
 350                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 351
 352         switch (runtime->format) {
 353         case SNDRV_PCM_FORMAT_S16_LE:
 354                 if (cpu_is_at32ap7000())
 355                         word |= AC97C_CMR_CEM_LITTLE;
 356                 break;
 357         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
 358                 word &= ~(AC97C_CMR_CEM_LITTLE);
 359                 break;
 360         default:
 361                 word = ac97c_readl(chip, OCA);
 362                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 363                 ac97c_writel(chip, OCA, word);
 364                 return -EINVAL;
 365         }
 366
 367         /* Enable underrun interrupt on channel A */
 368         word |= AC97C_CSR_UNRUN;
 369
 370         ac97c_writel(chip, CAMR, word);
 371
 372         /* Enable channel A event interrupt */
 373         word = ac97c_readl(chip, IMR);
 374         word |= AC97C_SR_CAEVT;
 375         ac97c_writel(chip, IER, word);
 376
 377         /* set variable rate if needed */
 378         if (runtime->rate != 48000) {
 379                 word = ac97c_readl(chip, MR);
 380                 word |= AC97C_MR_VRA;
 381                 ac97c_writel(chip, MR, word);
 382         } else {
 383                 word = ac97c_readl(chip, MR);
 384                 word &= ~(AC97C_MR_VRA);
 385                 ac97c_writel(chip, MR, word);
 386         }
 387
 388         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
 389                         runtime->rate);
 390         if (retval)
 391                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 392                                 runtime->rate);
 393
 394         if (cpu_is_at32ap7000()) {
 395                 if (!test_bit(DMA_TX_READY, &chip->flags))
 396                         retval = atmel_ac97c_prepare_dma(chip, substream,
 397                                         DMA_MEM_TO_DEV);
 398         } else {
 399                 /* Initialize and start the PDC */
 400                 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
 401                 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
 402                 writel(runtime->dma_addr + block_size,
 403                                 chip->regs + ATMEL_PDC_TNPR);
 404                 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
 405         }
 406
 407         return retval;
 408 }
 409
 410 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
 411 {
 412         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 413         struct snd_pcm_runtime *runtime = substream->runtime;
 414         int block_size = frames_to_bytes(runtime, runtime->period_size);
 415         unsigned long word = ac97c_readl(chip, ICA);
 416         int retval;
 417
 418         chip->capture_period = 0;
 419         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 420
 421         /* assign channels to AC97C channel A */
 422         switch (runtime->channels) {
 423         case 1:
 424                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 425                 break;
 426         case 2:
 427                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 428                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 429                 break;
 430         default:
 431                 /* TODO: support more than two channels */
 432                 return -EINVAL;
 433         }
 434         ac97c_writel(chip, ICA, word);
 435
 436         /* configure sample format and size */
 437         word = ac97c_readl(chip, CAMR);
 438         if (chip->opened <= 1)
 439                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 440         else
 441                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 442
 443         switch (runtime->format) {
 444         case SNDRV_PCM_FORMAT_S16_LE:
 445                 if (cpu_is_at32ap7000())
 446                         word |= AC97C_CMR_CEM_LITTLE;
 447                 break;
 448         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
 449                 word &= ~(AC97C_CMR_CEM_LITTLE);
 450                 break;
 451         default:
 452                 word = ac97c_readl(chip, ICA);
 453                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 454                 ac97c_writel(chip, ICA, word);
 455                 return -EINVAL;
 456         }
 457
 458         /* Enable overrun interrupt on channel A */
 459         word |= AC97C_CSR_OVRUN;
 460
 461         ac97c_writel(chip, CAMR, word);
 462
 463         /* Enable channel A event interrupt */
 464         word = ac97c_readl(chip, IMR);
 465         word |= AC97C_SR_CAEVT;
 466         ac97c_writel(chip, IER, word);
 467
 468         /* set variable rate if needed */
 469         if (runtime->rate != 48000) {
 470                 word = ac97c_readl(chip, MR);
 471                 word |= AC97C_MR_VRA;
 472                 ac97c_writel(chip, MR, word);
 473         } else {
 474                 word = ac97c_readl(chip, MR);
 475                 word &= ~(AC97C_MR_VRA);
 476                 ac97c_writel(chip, MR, word);
 477         }
 478
 479         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
 480                         runtime->rate);
 481         if (retval)
 482                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 483                                 runtime->rate);
 484
 485         if (cpu_is_at32ap7000()) {
 486                 if (!test_bit(DMA_RX_READY, &chip->flags))
 487                         retval = atmel_ac97c_prepare_dma(chip, substream,
 488                                         DMA_DEV_TO_MEM);
 489         } else {
 490                 /* Initialize and start the PDC */
 491                 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
 492                 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
 493                 writel(runtime->dma_addr + block_size,
 494                                 chip->regs + ATMEL_PDC_RNPR);
 495                 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
 496         }
 497
 498         return retval;
 499 }
 500
 501 static int
 502 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 503 {
 504         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 505         unsigned long camr, ptcr = 0;
 506         int retval = 0;
 507
 508         camr = ac97c_readl(chip, CAMR);
 509
 510         switch (cmd) {
 511         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 512         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 513         case SNDRV_PCM_TRIGGER_START:
 514                 if (cpu_is_at32ap7000()) {
 515                         retval = dw_dma_cyclic_start(chip->dma.tx_chan);
 516                         if (retval)
 517                                 goto out;
 518                 } else {
 519                         ptcr = ATMEL_PDC_TXTEN;
 520                 }
 521                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
 522                 break;
 523         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 524         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 525         case SNDRV_PCM_TRIGGER_STOP:
 526                 if (cpu_is_at32ap7000())
 527                         dw_dma_cyclic_stop(chip->dma.tx_chan);
 528                 else
 529                         ptcr |= ATMEL_PDC_TXTDIS;
 530                 if (chip->opened <= 1)
 531                         camr &= ~AC97C_CMR_CENA;
 532                 break;
 533         default:
 534                 retval = -EINVAL;
 535                 goto out;
 536         }
 537
 538         ac97c_writel(chip, CAMR, camr);
 539         if (!cpu_is_at32ap7000())
 540                 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 541 out:
 542         return retval;
 543 }
 544
 545 static int
 546 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 547 {
 548         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 549         unsigned long camr, ptcr = 0;
 550         int retval = 0;
 551
 552         camr = ac97c_readl(chip, CAMR);
 553         ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
 554
 555         switch (cmd) {
 556         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 557         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 558         case SNDRV_PCM_TRIGGER_START:
 559                 if (cpu_is_at32ap7000()) {
 560                         retval = dw_dma_cyclic_start(chip->dma.rx_chan);
 561                         if (retval)
 562                                 goto out;
 563                 } else {
 564                         ptcr = ATMEL_PDC_RXTEN;
 565                 }
 566                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
 567                 break;
 568         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 569         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 570         case SNDRV_PCM_TRIGGER_STOP:
 571                 if (cpu_is_at32ap7000())
 572                         dw_dma_cyclic_stop(chip->dma.rx_chan);
 573                 else
 574                         ptcr |= (ATMEL_PDC_RXTDIS);
 575                 if (chip->opened <= 1)
 576                         camr &= ~AC97C_CMR_CENA;
 577                 break;
 578         default:
 579                 retval = -EINVAL;
 580                 break;
 581         }
 582
 583         ac97c_writel(chip, CAMR, camr);
 584         if (!cpu_is_at32ap7000())
 585                 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 586 out:
 587         return retval;
 588 }
 589
 590 static snd_pcm_uframes_t
 591 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
 592 {
 593         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 594         struct snd_pcm_runtime  *runtime = substream->runtime;
 595         snd_pcm_uframes_t       frames;
 596         unsigned long           bytes;
 597
 598         if (cpu_is_at32ap7000())
 599                 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
 600         else
 601                 bytes = readl(chip->regs + ATMEL_PDC_TPR);
 602         bytes -= runtime->dma_addr;
 603
 604         frames = bytes_to_frames(runtime, bytes);
 605         if (frames >= runtime->buffer_size)
 606                 frames -= runtime->buffer_size;
 607         return frames;
 608 }
 609
 610 static snd_pcm_uframes_t
 611 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
 612 {
 613         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 614         struct snd_pcm_runtime  *runtime = substream->runtime;
 615         snd_pcm_uframes_t       frames;
 616         unsigned long           bytes;
 617
 618         if (cpu_is_at32ap7000())
 619                 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
 620         else
 621                 bytes = readl(chip->regs + ATMEL_PDC_RPR);
 622         bytes -= runtime->dma_addr;
 623
 624         frames = bytes_to_frames(runtime, bytes);
 625         if (frames >= runtime->buffer_size)
 626                 frames -= runtime->buffer_size;
 627         return frames;
 628 }
 629
 630 static struct snd_pcm_ops atmel_ac97_playback_ops = {
 631         .open           = atmel_ac97c_playback_open,
 632         .close          = atmel_ac97c_playback_close,
 633         .ioctl          = snd_pcm_lib_ioctl,
 634         .hw_params      = atmel_ac97c_playback_hw_params,
 635         .hw_free        = atmel_ac97c_playback_hw_free,
 636         .prepare        = atmel_ac97c_playback_prepare,
 637         .trigger        = atmel_ac97c_playback_trigger,
 638         .pointer        = atmel_ac97c_playback_pointer,
 639 };
 640
 641 static struct snd_pcm_ops atmel_ac97_capture_ops = {
 642         .open           = atmel_ac97c_capture_open,
 643         .close          = atmel_ac97c_capture_close,
 644         .ioctl          = snd_pcm_lib_ioctl,
 645         .hw_params      = atmel_ac97c_capture_hw_params,
 646         .hw_free        = atmel_ac97c_capture_hw_free,
 647         .prepare        = atmel_ac97c_capture_prepare,
 648         .trigger        = atmel_ac97c_capture_trigger,
 649         .pointer        = atmel_ac97c_capture_pointer,
 650 };
 651
 652 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
 653 {
 654         struct atmel_ac97c      *chip  = (struct atmel_ac97c *)dev;
 655         irqreturn_t             retval = IRQ_NONE;
 656         u32                     sr     = ac97c_readl(chip, SR);
 657         u32                     casr   = ac97c_readl(chip, CASR);
 658         u32                     cosr   = ac97c_readl(chip, COSR);
 659         u32                     camr   = ac97c_readl(chip, CAMR);
 660
 661         if (sr & AC97C_SR_CAEVT) {
 662                 struct snd_pcm_runtime *runtime;
 663                 int offset, next_period, block_size;
 664                 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
 665                                 casr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
 666                                 casr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
 667                                 casr & AC97C_CSR_UNRUN   ? " UNRUN"   : "",
 668                                 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
 669                                 casr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
 670                                 !casr                    ? " NONE"    : "");
 671                 if (!cpu_is_at32ap7000()) {
 672                         if ((casr & camr) & AC97C_CSR_ENDTX) {
 673                                 runtime = chip->playback_substream->runtime;
 674                                 block_size = frames_to_bytes(runtime,
 675                                                 runtime->period_size);
 676                                 chip->playback_period++;
 677
 678                                 if (chip->playback_period == runtime->periods)
 679                                         chip->playback_period = 0;
 680                                 next_period = chip->playback_period + 1;
 681                                 if (next_period == runtime->periods)
 682                                         next_period = 0;
 683
 684                                 offset = block_size * next_period;
 685
 686                                 writel(runtime->dma_addr + offset,
 687                                                 chip->regs + ATMEL_PDC_TNPR);
 688                                 writel(block_size / 2,
 689                                                 chip->regs + ATMEL_PDC_TNCR);
 690
 691                                 snd_pcm_period_elapsed(
 692                                                 chip->playback_substream);
 693                         }
 694                         if ((casr & camr) & AC97C_CSR_ENDRX) {
 695                                 runtime = chip->capture_substream->runtime;
 696                                 block_size = frames_to_bytes(runtime,
 697                                                 runtime->period_size);
 698                                 chip->capture_period++;
 699
 700                                 if (chip->capture_period == runtime->periods)
 701                                         chip->capture_period = 0;
 702                                 next_period = chip->capture_period + 1;
 703                                 if (next_period == runtime->periods)
 704                                         next_period = 0;
 705
 706                                 offset = block_size * next_period;
 707
 708                                 writel(runtime->dma_addr + offset,
 709                                                 chip->regs + ATMEL_PDC_RNPR);
 710                                 writel(block_size / 2,
 711                                                 chip->regs + ATMEL_PDC_RNCR);
 712                                 snd_pcm_period_elapsed(chip->capture_substream);
 713                         }
 714                 }
 715                 retval = IRQ_HANDLED;
 716         }
 717
 718         if (sr & AC97C_SR_COEVT) {
 719                 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
 720                                 cosr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
 721                                 cosr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
 722                                 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
 723                                 cosr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
 724                                 !cosr                    ? " NONE"    : "");
 725                 retval = IRQ_HANDLED;
 726         }
 727
 728         if (retval == IRQ_NONE) {
 729                 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
 730                                 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
 731         }
 732
 733         return retval;
 734 }
 735
 736 static struct ac97_pcm at91_ac97_pcm_defs[] __devinitdata = {
 737         /* Playback */
 738         {
 739                 .exclusive = 1,
 740                 .r = { {
 741                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 742                                   | (1 << AC97_SLOT_PCM_RIGHT)),
 743                 } },
 744         },
 745         /* PCM in */
 746         {
 747                 .stream = 1,
 748                 .exclusive = 1,
 749                 .r = { {
 750                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 751                                         | (1 << AC97_SLOT_PCM_RIGHT)),
 752                 } }
 753         },
 754         /* Mic in */
 755         {
 756                 .stream = 1,
 757                 .exclusive = 1,
 758                 .r = { {
 759                         .slots = (1<<AC97_SLOT_MIC),
 760                 } }
 761         },
 762 };
 763
 764 static int __devinit atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
 765 {
 766         struct snd_pcm          *pcm;
 767         struct snd_pcm_hardware hw = atmel_ac97c_hw;
 768         int                     capture, playback, retval, err;
 769
 770         capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
 771         playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
 772
 773         if (!cpu_is_at32ap7000()) {
 774                 err = snd_ac97_pcm_assign(chip->ac97_bus,
 775                                 ARRAY_SIZE(at91_ac97_pcm_defs),
 776                                 at91_ac97_pcm_defs);
 777                 if (err)
 778                         return err;
 779         }
 780         retval = snd_pcm_new(chip->card, chip->card->shortname,
 781                         chip->pdev->id, playback, capture, &pcm);
 782         if (retval)
 783                 return retval;
 784
 785         if (capture)
 786                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 787                                 &atmel_ac97_capture_ops);
 788         if (playback)
 789                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 790                                 &atmel_ac97_playback_ops);
 791
 792         retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 793                         &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
 794                         hw.buffer_bytes_max);
 795         if (retval)
 796                 return retval;
 797
 798         pcm->private_data = chip;
 799         pcm->info_flags = 0;
 800         strcpy(pcm->name, chip->card->shortname);
 801         chip->pcm = pcm;
 802
 803         return 0;
 804 }
 805
 806 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
 807 {
 808         struct snd_ac97_template template;
 809         memset(&template, 0, sizeof(template));
 810         template.private_data = chip;
 811         return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
 812 }
 813
 814 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
 815                 unsigned short val)
 816 {
 817         struct atmel_ac97c *chip = get_chip(ac97);
 818         unsigned long word;
 819         int timeout = 40;
 820
 821         word = (reg & 0x7f) << 16 | val;
 822
 823         do {
 824                 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
 825                         ac97c_writel(chip, COTHR, word);
 826                         return;
 827                 }
 828                 udelay(1);
 829         } while (--timeout);
 830
 831         dev_dbg(&chip->pdev->dev, "codec write timeout\n");
 832 }
 833
 834 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
 835                 unsigned short reg)
 836 {
 837         struct atmel_ac97c *chip = get_chip(ac97);
 838         unsigned long word;
 839         int timeout = 40;
 840         int write = 10;
 841
 842         word = (0x80 | (reg & 0x7f)) << 16;
 843
 844         if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
 845                 ac97c_readl(chip, CORHR);
 846
 847 retry_write:
 848         timeout = 40;
 849
 850         do {
 851                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
 852                         ac97c_writel(chip, COTHR, word);
 853                         goto read_reg;
 854                 }
 855                 udelay(10);
 856         } while (--timeout);
 857
 858         if (!--write)
 859                 goto timed_out;
 860         goto retry_write;
 861
 862 read_reg:
 863         do {
 864                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
 865                         unsigned short val = ac97c_readl(chip, CORHR);
 866                         return val;
 867                 }
 868                 udelay(10);
 869         } while (--timeout);
 870
 871         if (!--write)
 872                 goto timed_out;
 873         goto retry_write;
 874
 875 timed_out:
 876         dev_dbg(&chip->pdev->dev, "codec read timeout\n");
 877         return 0xffff;
 878 }
 879
 880 static bool filter(struct dma_chan *chan, void *slave)
 881 {
 882         struct dw_dma_slave *dws = slave;
 883
 884         if (dws->dma_dev == chan->device->dev) {
 885                 chan->private = dws;
 886                 return true;
 887         } else
 888                 return false;
 889 }
 890
 891 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
 892 {
 893         ac97c_writel(chip, MR,   0);
 894         ac97c_writel(chip, MR,   AC97C_MR_ENA);
 895         ac97c_writel(chip, CAMR, 0);
 896         ac97c_writel(chip, COMR, 0);
 897
 898         if (gpio_is_valid(chip->reset_pin)) {
 899                 gpio_set_value(chip->reset_pin, 0);
 900                 /* AC97 v2.2 specifications says minimum 1 us. */
 901                 udelay(2);
 902                 gpio_set_value(chip->reset_pin, 1);
 903         } else {
 904                 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
 905                 udelay(2);
 906                 ac97c_writel(chip, MR, AC97C_MR_ENA);
 907         }
 908 }
 909
 910 static int __devinit atmel_ac97c_probe(struct platform_device *pdev)
 911 {
 912         struct snd_card                 *card;
 913         struct atmel_ac97c              *chip;
 914         struct resource                 *regs;
 915         struct ac97c_platform_data      *pdata;
 916         struct clk                      *pclk;
 917         static struct snd_ac97_bus_ops  ops = {
 918                 .write  = atmel_ac97c_write,
 919                 .read   = atmel_ac97c_read,
 920         };
 921         int                             retval;
 922         int                             irq;
 923
 924         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 925         if (!regs) {
 926                 dev_dbg(&pdev->dev, "no memory resource\n");
 927                 return -ENXIO;
 928         }
 929
 930         pdata = pdev->dev.platform_data;
 931         if (!pdata) {
 932                 dev_dbg(&pdev->dev, "no platform data\n");
 933                 return -ENXIO;
 934         }
 935
 936         irq = platform_get_irq(pdev, 0);
 937         if (irq < 0) {
 938                 dev_dbg(&pdev->dev, "could not get irq\n");
 939                 return -ENXIO;
 940         }
 941
 942         if (cpu_is_at32ap7000()) {
 943                 pclk = clk_get(&pdev->dev, "pclk");
 944         } else {
 945                 pclk = clk_get(&pdev->dev, "ac97_clk");
 946         }
 947
 948         if (IS_ERR(pclk)) {
 949                 dev_dbg(&pdev->dev, "no peripheral clock\n");
 950                 return PTR_ERR(pclk);
 951         }
 952         clk_enable(pclk);
 953
 954         retval = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 955                         THIS_MODULE, sizeof(struct atmel_ac97c), &card);
 956         if (retval) {
 957                 dev_dbg(&pdev->dev, "could not create sound card device\n");
 958                 goto err_snd_card_new;
 959         }
 960
 961         chip = get_chip(card);
 962
 963         retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
 964         if (retval) {
 965                 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
 966                 goto err_request_irq;
 967         }
 968         chip->irq = irq;
 969
 970         spin_lock_init(&chip->lock);
 971
 972         strcpy(card->driver, "Atmel AC97C");
 973         strcpy(card->shortname, "Atmel AC97C");
 974         sprintf(card->longname, "Atmel AC97 controller");
 975
 976         chip->card = card;
 977         chip->pclk = pclk;
 978         chip->pdev = pdev;
 979         chip->regs = ioremap(regs->start, resource_size(regs));
 980
 981         if (!chip->regs) {
 982                 dev_dbg(&pdev->dev, "could not remap register memory\n");
 983                 goto err_ioremap;
 984         }
 985
 986         if (gpio_is_valid(pdata->reset_pin)) {
 987                 if (gpio_request(pdata->reset_pin, "reset_pin")) {
 988                         dev_dbg(&pdev->dev, "reset pin not available\n");
 989                         chip->reset_pin = -ENODEV;
 990                 } else {
 991                         gpio_direction_output(pdata->reset_pin, 1);
 992                         chip->reset_pin = pdata->reset_pin;
 993                 }
 994         } else {
 995                 chip->reset_pin = -EINVAL;
 996         }
 997
 998         snd_card_set_dev(card, &pdev->dev);
 999
1000         atmel_ac97c_reset(chip);
1001
1002         /* Enable overrun interrupt from codec channel */
1003         ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
1004         ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1005
1006         retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1007         if (retval) {
1008                 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1009                 goto err_ac97_bus;
1010         }
1011
1012         retval = atmel_ac97c_mixer_new(chip);
1013         if (retval) {
1014                 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1015                 goto err_ac97_bus;
1016         }
1017
1018         if (cpu_is_at32ap7000()) {
1019                 if (pdata->rx_dws.dma_dev) {
1020                         dma_cap_mask_t mask;
1021
1022                         dma_cap_zero(mask);
1023                         dma_cap_set(DMA_SLAVE, mask);
1024
1025                         chip->dma.rx_chan = dma_request_channel(mask, filter,
1026                                                                 &pdata->rx_dws);
1027                         if (chip->dma.rx_chan) {
1028                                 struct dma_slave_config dma_conf = {
1029                                         .src_addr = regs->start + AC97C_CARHR +
1030                                                 2,
1031                                         .src_addr_width =
1032                                                 DMA_SLAVE_BUSWIDTH_2_BYTES,
1033                                         .src_maxburst = 1,
1034                                         .dst_maxburst = 1,
1035                                         .direction = DMA_DEV_TO_MEM,
1036                                         .device_fc = false,
1037                                 };
1038
1039                                 dmaengine_slave_config(chip->dma.rx_chan,
1040                                                 &dma_conf);
1041                         }
1042
1043                         dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1044                                 dev_name(&chip->dma.rx_chan->dev->device));
1045                         set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1046                 }
1047
1048                 if (pdata->tx_dws.dma_dev) {
1049                         dma_cap_mask_t mask;
1050
1051                         dma_cap_zero(mask);
1052                         dma_cap_set(DMA_SLAVE, mask);
1053
1054                         chip->dma.tx_chan = dma_request_channel(mask, filter,
1055                                                                 &pdata->tx_dws);
1056                         if (chip->dma.tx_chan) {
1057                                 struct dma_slave_config dma_conf = {
1058                                         .dst_addr = regs->start + AC97C_CATHR +
1059                                                 2,
1060                                         .dst_addr_width =
1061                                                 DMA_SLAVE_BUSWIDTH_2_BYTES,
1062                                         .src_maxburst = 1,
1063                                         .dst_maxburst = 1,
1064                                         .direction = DMA_MEM_TO_DEV,
1065                                         .device_fc = false,
1066                                 };
1067
1068                                 dmaengine_slave_config(chip->dma.tx_chan,
1069                                                 &dma_conf);
1070                         }
1071
1072                         dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1073                                 dev_name(&chip->dma.tx_chan->dev->device));
1074                         set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1075                 }
1076
1077                 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1078                                 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1079                         dev_dbg(&pdev->dev, "DMA not available\n");
1080                         retval = -ENODEV;
1081                         goto err_dma;
1082                 }
1083         } else {
1084                 /* Just pretend that we have DMA channel(for at91 i is actually
1085                  * the PDC) */
1086                 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1087                 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1088         }
1089
1090         retval = atmel_ac97c_pcm_new(chip);
1091         if (retval) {
1092                 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1093                 goto err_dma;
1094         }
1095
1096         retval = snd_card_register(card);
1097         if (retval) {
1098                 dev_dbg(&pdev->dev, "could not register sound card\n");
1099                 goto err_dma;
1100         }
1101
1102         platform_set_drvdata(pdev, card);
1103
1104         dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1105                         chip->regs, irq);
1106
1107         return 0;
1108
1109 err_dma:
1110         if (cpu_is_at32ap7000()) {
1111                 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1112                         dma_release_channel(chip->dma.rx_chan);
1113                 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1114                         dma_release_channel(chip->dma.tx_chan);
1115                 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1116                 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1117                 chip->dma.rx_chan = NULL;
1118                 chip->dma.tx_chan = NULL;
1119         }
1120 err_ac97_bus:
1121         snd_card_set_dev(card, NULL);
1122
1123         if (gpio_is_valid(chip->reset_pin))
1124                 gpio_free(chip->reset_pin);
1125
1126         iounmap(chip->regs);
1127 err_ioremap:
1128         free_irq(irq, chip);
1129 err_request_irq:
1130         snd_card_free(card);
1131 err_snd_card_new:
1132         clk_disable(pclk);
1133         clk_put(pclk);
1134         return retval;
1135 }
1136
1137 #ifdef CONFIG_PM
1138 static int atmel_ac97c_suspend(struct device *pdev)
1139 {
1140         struct snd_card *card = dev_get_drvdata(pdev);
1141         struct atmel_ac97c *chip = card->private_data;
1142
1143         if (cpu_is_at32ap7000()) {
1144                 if (test_bit(DMA_RX_READY, &chip->flags))
1145                         dw_dma_cyclic_stop(chip->dma.rx_chan);
1146                 if (test_bit(DMA_TX_READY, &chip->flags))
1147                         dw_dma_cyclic_stop(chip->dma.tx_chan);
1148         }
1149         clk_disable(chip->pclk);
1150
1151         return 0;
1152 }
1153
1154 static int atmel_ac97c_resume(struct device *pdev)
1155 {
1156         struct snd_card *card = dev_get_drvdata(pdev);
1157         struct atmel_ac97c *chip = card->private_data;
1158
1159         clk_enable(chip->pclk);
1160         if (cpu_is_at32ap7000()) {
1161                 if (test_bit(DMA_RX_READY, &chip->flags))
1162                         dw_dma_cyclic_start(chip->dma.rx_chan);
1163                 if (test_bit(DMA_TX_READY, &chip->flags))
1164                         dw_dma_cyclic_start(chip->dma.tx_chan);
1165         }
1166         return 0;
1167 }
1168
1169 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
1170 #define ATMEL_AC97C_PM_OPS      &atmel_ac97c_pm
1171 #else
1172 #define ATMEL_AC97C_PM_OPS      NULL
1173 #endif
1174
1175 static int __devexit atmel_ac97c_remove(struct platform_device *pdev)
1176 {
1177         struct snd_card *card = platform_get_drvdata(pdev);
1178         struct atmel_ac97c *chip = get_chip(card);
1179
1180         if (gpio_is_valid(chip->reset_pin))
1181                 gpio_free(chip->reset_pin);
1182
1183         ac97c_writel(chip, CAMR, 0);
1184         ac97c_writel(chip, COMR, 0);
1185         ac97c_writel(chip, MR,   0);
1186
1187         clk_disable(chip->pclk);
1188         clk_put(chip->pclk);
1189         iounmap(chip->regs);
1190         free_irq(chip->irq, chip);
1191
1192         if (cpu_is_at32ap7000()) {
1193                 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1194                         dma_release_channel(chip->dma.rx_chan);
1195                 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1196                         dma_release_channel(chip->dma.tx_chan);
1197                 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1198                 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1199                 chip->dma.rx_chan = NULL;
1200                 chip->dma.tx_chan = NULL;
1201         }
1202
1203         snd_card_set_dev(card, NULL);
1204         snd_card_free(card);
1205
1206         platform_set_drvdata(pdev, NULL);
1207
1208         return 0;
1209 }
1210
1211 static struct platform_driver atmel_ac97c_driver = {
1212         .remove         = __devexit_p(atmel_ac97c_remove),
1213         .driver         = {
1214                 .name   = "atmel_ac97c",
1215                 .owner  = THIS_MODULE,
1216                 .pm     = ATMEL_AC97C_PM_OPS,
1217         },
1218 };
1219
1220 static int __init atmel_ac97c_init(void)
1221 {
1222         return platform_driver_probe(&atmel_ac97c_driver,
1223                         atmel_ac97c_probe);
1224 }
1225 module_init(atmel_ac97c_init);
1226
1227 static void __exit atmel_ac97c_exit(void)
1228 {
1229         platform_driver_unregister(&atmel_ac97c_driver);
1230 }
1231 module_exit(atmel_ac97c_exit);
1232
1233 MODULE_LICENSE("GPL");
1234 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1235 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");