kernel/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 #include <linux/of.h>
  26 #include <linux/of_gpio.h>
  27 #include <linux/of_device.h>
  28
  29 #include <sound/core.h>
  30 #include <sound/initval.h>
  31 #include <sound/pcm.h>
  32 #include <sound/pcm_params.h>
  33 #include <sound/ac97_codec.h>
  34 #include <sound/atmel-ac97c.h>
  35 #include <sound/memalloc.h>
  36
  37 #include <linux/platform_data/dma-dw.h>
  38 #include <linux/dma/dw.h>
  39
  40 #ifdef CONFIG_AVR32
  41 #include <mach/cpu.h>
  42 #else
  43 #define cpu_is_at32ap7000() 0
  44 #endif
  45
  46 #include "ac97c.h"
  47
  48 enum {
  49         DMA_TX_READY = 0,
  50         DMA_RX_READY,
  51         DMA_TX_CHAN_PRESENT,
  52         DMA_RX_CHAN_PRESENT,
  53 };
  54
  55 /* Serialize access to opened variable */
  56 static DEFINE_MUTEX(opened_mutex);
  57
  58 struct atmel_ac97c_dma {
  59         struct dma_chan                 *rx_chan;
  60         struct dma_chan                 *tx_chan;
  61 };
  62
  63 struct atmel_ac97c {
  64         struct clk                      *pclk;
  65         struct platform_device          *pdev;
  66         struct atmel_ac97c_dma          dma;
  67
  68         struct snd_pcm_substream        *playback_substream;
  69         struct snd_pcm_substream        *capture_substream;
  70         struct snd_card                 *card;
  71         struct snd_pcm                  *pcm;
  72         struct snd_ac97                 *ac97;
  73         struct snd_ac97_bus             *ac97_bus;
  74
  75         u64                             cur_format;
  76         unsigned int                    cur_rate;
  77         unsigned long                   flags;
  78         int                             playback_period, capture_period;
  79         /* Serialize access to opened variable */
  80         spinlock_t                      lock;
  81         void __iomem                    *regs;
  82         int                             irq;
  83         int                             opened;
  84         int                             reset_pin;
  85 };
  86
  87 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
  88
  89 #define ac97c_writel(chip, reg, val)                    \
  90         __raw_writel((val), (chip)->regs + AC97C_##reg)
  91 #define ac97c_readl(chip, reg)                          \
  92         __raw_readl((chip)->regs + AC97C_##reg)
  93
  94 /* This function is called by the DMA driver. */
  95 static void atmel_ac97c_dma_playback_period_done(void *arg)
  96 {
  97         struct atmel_ac97c *chip = arg;
  98         snd_pcm_period_elapsed(chip->playback_substream);
  99 }
 100
 101 static void atmel_ac97c_dma_capture_period_done(void *arg)
 102 {
 103         struct atmel_ac97c *chip = arg;
 104         snd_pcm_period_elapsed(chip->capture_substream);
 105 }
 106
 107 static int atmel_ac97c_prepare_dma(struct atmel_ac97c *chip,
 108                 struct snd_pcm_substream *substream,
 109                 enum dma_transfer_direction direction)
 110 {
 111         struct dma_chan                 *chan;
 112         struct dw_cyclic_desc           *cdesc;
 113         struct snd_pcm_runtime          *runtime = substream->runtime;
 114         unsigned long                   buffer_len, period_len;
 115
 116         /*
 117          * We don't do DMA on "complex" transfers, i.e. with
 118          * non-halfword-aligned buffers or lengths.
 119          */
 120         if (runtime->dma_addr & 1 || runtime->buffer_size & 1) {
 121                 dev_dbg(&chip->pdev->dev, "too complex transfer\n");
 122                 return -EINVAL;
 123         }
 124
 125         if (direction == DMA_MEM_TO_DEV)
 126                 chan = chip->dma.tx_chan;
 127         else
 128                 chan = chip->dma.rx_chan;
 129
 130         buffer_len = frames_to_bytes(runtime, runtime->buffer_size);
 131         period_len = frames_to_bytes(runtime, runtime->period_size);
 132
 133         cdesc = dw_dma_cyclic_prep(chan, runtime->dma_addr, buffer_len,
 134                         period_len, direction);
 135         if (IS_ERR(cdesc)) {
 136                 dev_dbg(&chip->pdev->dev, "could not prepare cyclic DMA\n");
 137                 return PTR_ERR(cdesc);
 138         }
 139
 140         if (direction == DMA_MEM_TO_DEV) {
 141                 cdesc->period_callback = atmel_ac97c_dma_playback_period_done;
 142                 set_bit(DMA_TX_READY, &chip->flags);
 143         } else {
 144                 cdesc->period_callback = atmel_ac97c_dma_capture_period_done;
 145                 set_bit(DMA_RX_READY, &chip->flags);
 146         }
 147
 148         cdesc->period_callback_param = chip;
 149
 150         return 0;
 151 }
 152
 153 static struct snd_pcm_hardware atmel_ac97c_hw = {
 154         .info                   = (SNDRV_PCM_INFO_MMAP
 155                                   | SNDRV_PCM_INFO_MMAP_VALID
 156                                   | SNDRV_PCM_INFO_INTERLEAVED
 157                                   | SNDRV_PCM_INFO_BLOCK_TRANSFER
 158                                   | SNDRV_PCM_INFO_JOINT_DUPLEX
 159                                   | SNDRV_PCM_INFO_RESUME
 160                                   | SNDRV_PCM_INFO_PAUSE),
 161         .formats                = (SNDRV_PCM_FMTBIT_S16_BE
 162                                   | SNDRV_PCM_FMTBIT_S16_LE),
 163         .rates                  = (SNDRV_PCM_RATE_CONTINUOUS),
 164         .rate_min               = 4000,
 165         .rate_max               = 48000,
 166         .channels_min           = 1,
 167         .channels_max           = 2,
 168         .buffer_bytes_max       = 2 * 2 * 64 * 2048,
 169         .period_bytes_min       = 4096,
 170         .period_bytes_max       = 4096,
 171         .periods_min            = 6,
 172         .periods_max            = 64,
 173 };
 174
 175 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
 176 {
 177         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 178         struct snd_pcm_runtime *runtime = substream->runtime;
 179
 180         mutex_lock(&opened_mutex);
 181         chip->opened++;
 182         runtime->hw = atmel_ac97c_hw;
 183         if (chip->cur_rate) {
 184                 runtime->hw.rate_min = chip->cur_rate;
 185                 runtime->hw.rate_max = chip->cur_rate;
 186         }
 187         if (chip->cur_format)
 188                 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
 189         mutex_unlock(&opened_mutex);
 190         chip->playback_substream = substream;
 191         return 0;
 192 }
 193
 194 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
 195 {
 196         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 197         struct snd_pcm_runtime *runtime = substream->runtime;
 198
 199         mutex_lock(&opened_mutex);
 200         chip->opened++;
 201         runtime->hw = atmel_ac97c_hw;
 202         if (chip->cur_rate) {
 203                 runtime->hw.rate_min = chip->cur_rate;
 204                 runtime->hw.rate_max = chip->cur_rate;
 205         }
 206         if (chip->cur_format)
 207                 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
 208         mutex_unlock(&opened_mutex);
 209         chip->capture_substream = substream;
 210         return 0;
 211 }
 212
 213 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
 214 {
 215         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 216
 217         mutex_lock(&opened_mutex);
 218         chip->opened--;
 219         if (!chip->opened) {
 220                 chip->cur_rate = 0;
 221                 chip->cur_format = 0;
 222         }
 223         mutex_unlock(&opened_mutex);
 224
 225         chip->playback_substream = NULL;
 226
 227         return 0;
 228 }
 229
 230 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
 231 {
 232         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 233
 234         mutex_lock(&opened_mutex);
 235         chip->opened--;
 236         if (!chip->opened) {
 237                 chip->cur_rate = 0;
 238                 chip->cur_format = 0;
 239         }
 240         mutex_unlock(&opened_mutex);
 241
 242         chip->capture_substream = NULL;
 243
 244         return 0;
 245 }
 246
 247 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
 248                 struct snd_pcm_hw_params *hw_params)
 249 {
 250         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 251         int retval;
 252
 253         retval = snd_pcm_lib_malloc_pages(substream,
 254                                         params_buffer_bytes(hw_params));
 255         if (retval < 0)
 256                 return retval;
 257         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 258         if (cpu_is_at32ap7000()) {
 259                 /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 260                 if (retval == 1)
 261                         if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
 262                                 dw_dma_cyclic_free(chip->dma.tx_chan);
 263         }
 264         /* Set restrictions to params. */
 265         mutex_lock(&opened_mutex);
 266         chip->cur_rate = params_rate(hw_params);
 267         chip->cur_format = params_format(hw_params);
 268         mutex_unlock(&opened_mutex);
 269
 270         return retval;
 271 }
 272
 273 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
 274                 struct snd_pcm_hw_params *hw_params)
 275 {
 276         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 277         int retval;
 278
 279         retval = snd_pcm_lib_malloc_pages(substream,
 280                                         params_buffer_bytes(hw_params));
 281         if (retval < 0)
 282                 return retval;
 283         /* snd_pcm_lib_malloc_pages returns 1 if buffer is changed. */
 284         if (cpu_is_at32ap7000() && retval == 1)
 285                 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
 286                         dw_dma_cyclic_free(chip->dma.rx_chan);
 287
 288         /* Set restrictions to params. */
 289         mutex_lock(&opened_mutex);
 290         chip->cur_rate = params_rate(hw_params);
 291         chip->cur_format = params_format(hw_params);
 292         mutex_unlock(&opened_mutex);
 293
 294         return retval;
 295 }
 296
 297 static int atmel_ac97c_playback_hw_free(struct snd_pcm_substream *substream)
 298 {
 299         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 300         if (cpu_is_at32ap7000()) {
 301                 if (test_and_clear_bit(DMA_TX_READY, &chip->flags))
 302                         dw_dma_cyclic_free(chip->dma.tx_chan);
 303         }
 304         return snd_pcm_lib_free_pages(substream);
 305 }
 306
 307 static int atmel_ac97c_capture_hw_free(struct snd_pcm_substream *substream)
 308 {
 309         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 310         if (cpu_is_at32ap7000()) {
 311                 if (test_and_clear_bit(DMA_RX_READY, &chip->flags))
 312                         dw_dma_cyclic_free(chip->dma.rx_chan);
 313         }
 314         return snd_pcm_lib_free_pages(substream);
 315 }
 316
 317 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
 318 {
 319         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 320         struct snd_pcm_runtime *runtime = substream->runtime;
 321         int block_size = frames_to_bytes(runtime, runtime->period_size);
 322         unsigned long word = ac97c_readl(chip, OCA);
 323         int retval;
 324
 325         chip->playback_period = 0;
 326         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 327
 328         /* assign channels to AC97C channel A */
 329         switch (runtime->channels) {
 330         case 1:
 331                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 332                 break;
 333         case 2:
 334                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 335                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 336                 break;
 337         default:
 338                 /* TODO: support more than two channels */
 339                 return -EINVAL;
 340         }
 341         ac97c_writel(chip, OCA, word);
 342
 343         /* configure sample format and size */
 344         word = ac97c_readl(chip, CAMR);
 345         if (chip->opened <= 1)
 346                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 347         else
 348                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 349
 350         switch (runtime->format) {
 351         case SNDRV_PCM_FORMAT_S16_LE:
 352                 if (cpu_is_at32ap7000())
 353                         word |= AC97C_CMR_CEM_LITTLE;
 354                 break;
 355         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
 356                 word &= ~(AC97C_CMR_CEM_LITTLE);
 357                 break;
 358         default:
 359                 word = ac97c_readl(chip, OCA);
 360                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 361                 ac97c_writel(chip, OCA, word);
 362                 return -EINVAL;
 363         }
 364
 365         /* Enable underrun interrupt on channel A */
 366         word |= AC97C_CSR_UNRUN;
 367
 368         ac97c_writel(chip, CAMR, word);
 369
 370         /* Enable channel A event interrupt */
 371         word = ac97c_readl(chip, IMR);
 372         word |= AC97C_SR_CAEVT;
 373         ac97c_writel(chip, IER, word);
 374
 375         /* set variable rate if needed */
 376         if (runtime->rate != 48000) {
 377                 word = ac97c_readl(chip, MR);
 378                 word |= AC97C_MR_VRA;
 379                 ac97c_writel(chip, MR, word);
 380         } else {
 381                 word = ac97c_readl(chip, MR);
 382                 word &= ~(AC97C_MR_VRA);
 383                 ac97c_writel(chip, MR, word);
 384         }
 385
 386         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
 387                         runtime->rate);
 388         if (retval)
 389                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 390                                 runtime->rate);
 391
 392         if (cpu_is_at32ap7000()) {
 393                 if (!test_bit(DMA_TX_READY, &chip->flags))
 394                         retval = atmel_ac97c_prepare_dma(chip, substream,
 395                                         DMA_MEM_TO_DEV);
 396         } else {
 397                 /* Initialize and start the PDC */
 398                 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
 399                 writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
 400                 writel(runtime->dma_addr + block_size,
 401                                 chip->regs + ATMEL_PDC_TNPR);
 402                 writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
 403         }
 404
 405         return retval;
 406 }
 407
 408 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
 409 {
 410         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 411         struct snd_pcm_runtime *runtime = substream->runtime;
 412         int block_size = frames_to_bytes(runtime, runtime->period_size);
 413         unsigned long word = ac97c_readl(chip, ICA);
 414         int retval;
 415
 416         chip->capture_period = 0;
 417         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 418
 419         /* assign channels to AC97C channel A */
 420         switch (runtime->channels) {
 421         case 1:
 422                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 423                 break;
 424         case 2:
 425                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 426                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 427                 break;
 428         default:
 429                 /* TODO: support more than two channels */
 430                 return -EINVAL;
 431         }
 432         ac97c_writel(chip, ICA, word);
 433
 434         /* configure sample format and size */
 435         word = ac97c_readl(chip, CAMR);
 436         if (chip->opened <= 1)
 437                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 438         else
 439                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 440
 441         switch (runtime->format) {
 442         case SNDRV_PCM_FORMAT_S16_LE:
 443                 if (cpu_is_at32ap7000())
 444                         word |= AC97C_CMR_CEM_LITTLE;
 445                 break;
 446         case SNDRV_PCM_FORMAT_S16_BE: /* fall through */
 447                 word &= ~(AC97C_CMR_CEM_LITTLE);
 448                 break;
 449         default:
 450                 word = ac97c_readl(chip, ICA);
 451                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 452                 ac97c_writel(chip, ICA, word);
 453                 return -EINVAL;
 454         }
 455
 456         /* Enable overrun interrupt on channel A */
 457         word |= AC97C_CSR_OVRUN;
 458
 459         ac97c_writel(chip, CAMR, word);
 460
 461         /* Enable channel A event interrupt */
 462         word = ac97c_readl(chip, IMR);
 463         word |= AC97C_SR_CAEVT;
 464         ac97c_writel(chip, IER, word);
 465
 466         /* set variable rate if needed */
 467         if (runtime->rate != 48000) {
 468                 word = ac97c_readl(chip, MR);
 469                 word |= AC97C_MR_VRA;
 470                 ac97c_writel(chip, MR, word);
 471         } else {
 472                 word = ac97c_readl(chip, MR);
 473                 word &= ~(AC97C_MR_VRA);
 474                 ac97c_writel(chip, MR, word);
 475         }
 476
 477         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
 478                         runtime->rate);
 479         if (retval)
 480                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 481                                 runtime->rate);
 482
 483         if (cpu_is_at32ap7000()) {
 484                 if (!test_bit(DMA_RX_READY, &chip->flags))
 485                         retval = atmel_ac97c_prepare_dma(chip, substream,
 486                                         DMA_DEV_TO_MEM);
 487         } else {
 488                 /* Initialize and start the PDC */
 489                 writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
 490                 writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
 491                 writel(runtime->dma_addr + block_size,
 492                                 chip->regs + ATMEL_PDC_RNPR);
 493                 writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
 494         }
 495
 496         return retval;
 497 }
 498
 499 static int
 500 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 501 {
 502         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 503         unsigned long camr, ptcr = 0;
 504         int retval = 0;
 505
 506         camr = ac97c_readl(chip, CAMR);
 507
 508         switch (cmd) {
 509         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 510         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 511         case SNDRV_PCM_TRIGGER_START:
 512                 if (cpu_is_at32ap7000()) {
 513                         retval = dw_dma_cyclic_start(chip->dma.tx_chan);
 514                         if (retval)
 515                                 goto out;
 516                 } else {
 517                         ptcr = ATMEL_PDC_TXTEN;
 518                 }
 519                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
 520                 break;
 521         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 522         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 523         case SNDRV_PCM_TRIGGER_STOP:
 524                 if (cpu_is_at32ap7000())
 525                         dw_dma_cyclic_stop(chip->dma.tx_chan);
 526                 else
 527                         ptcr |= ATMEL_PDC_TXTDIS;
 528                 if (chip->opened <= 1)
 529                         camr &= ~AC97C_CMR_CENA;
 530                 break;
 531         default:
 532                 retval = -EINVAL;
 533                 goto out;
 534         }
 535
 536         ac97c_writel(chip, CAMR, camr);
 537         if (!cpu_is_at32ap7000())
 538                 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 539 out:
 540         return retval;
 541 }
 542
 543 static int
 544 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 545 {
 546         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 547         unsigned long camr, ptcr = 0;
 548         int retval = 0;
 549
 550         camr = ac97c_readl(chip, CAMR);
 551         ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
 552
 553         switch (cmd) {
 554         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */
 555         case SNDRV_PCM_TRIGGER_RESUME: /* fall through */
 556         case SNDRV_PCM_TRIGGER_START:
 557                 if (cpu_is_at32ap7000()) {
 558                         retval = dw_dma_cyclic_start(chip->dma.rx_chan);
 559                         if (retval)
 560                                 goto out;
 561                 } else {
 562                         ptcr = ATMEL_PDC_RXTEN;
 563                 }
 564                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
 565                 break;
 566         case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */
 567         case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */
 568         case SNDRV_PCM_TRIGGER_STOP:
 569                 if (cpu_is_at32ap7000())
 570                         dw_dma_cyclic_stop(chip->dma.rx_chan);
 571                 else
 572                         ptcr |= (ATMEL_PDC_RXTDIS);
 573                 if (chip->opened <= 1)
 574                         camr &= ~AC97C_CMR_CENA;
 575                 break;
 576         default:
 577                 retval = -EINVAL;
 578                 break;
 579         }
 580
 581         ac97c_writel(chip, CAMR, camr);
 582         if (!cpu_is_at32ap7000())
 583                 writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 584 out:
 585         return retval;
 586 }
 587
 588 static snd_pcm_uframes_t
 589 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
 590 {
 591         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 592         struct snd_pcm_runtime  *runtime = substream->runtime;
 593         snd_pcm_uframes_t       frames;
 594         unsigned long           bytes;
 595
 596         if (cpu_is_at32ap7000())
 597                 bytes = dw_dma_get_src_addr(chip->dma.tx_chan);
 598         else
 599                 bytes = readl(chip->regs + ATMEL_PDC_TPR);
 600         bytes -= runtime->dma_addr;
 601
 602         frames = bytes_to_frames(runtime, bytes);
 603         if (frames >= runtime->buffer_size)
 604                 frames -= runtime->buffer_size;
 605         return frames;
 606 }
 607
 608 static snd_pcm_uframes_t
 609 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
 610 {
 611         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 612         struct snd_pcm_runtime  *runtime = substream->runtime;
 613         snd_pcm_uframes_t       frames;
 614         unsigned long           bytes;
 615
 616         if (cpu_is_at32ap7000())
 617                 bytes = dw_dma_get_dst_addr(chip->dma.rx_chan);
 618         else
 619                 bytes = readl(chip->regs + ATMEL_PDC_RPR);
 620         bytes -= runtime->dma_addr;
 621
 622         frames = bytes_to_frames(runtime, bytes);
 623         if (frames >= runtime->buffer_size)
 624                 frames -= runtime->buffer_size;
 625         return frames;
 626 }
 627
 628 static struct snd_pcm_ops atmel_ac97_playback_ops = {
 629         .open           = atmel_ac97c_playback_open,
 630         .close          = atmel_ac97c_playback_close,
 631         .ioctl          = snd_pcm_lib_ioctl,
 632         .hw_params      = atmel_ac97c_playback_hw_params,
 633         .hw_free        = atmel_ac97c_playback_hw_free,
 634         .prepare        = atmel_ac97c_playback_prepare,
 635         .trigger        = atmel_ac97c_playback_trigger,
 636         .pointer        = atmel_ac97c_playback_pointer,
 637 };
 638
 639 static struct snd_pcm_ops atmel_ac97_capture_ops = {
 640         .open           = atmel_ac97c_capture_open,
 641         .close          = atmel_ac97c_capture_close,
 642         .ioctl          = snd_pcm_lib_ioctl,
 643         .hw_params      = atmel_ac97c_capture_hw_params,
 644         .hw_free        = atmel_ac97c_capture_hw_free,
 645         .prepare        = atmel_ac97c_capture_prepare,
 646         .trigger        = atmel_ac97c_capture_trigger,
 647         .pointer        = atmel_ac97c_capture_pointer,
 648 };
 649
 650 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
 651 {
 652         struct atmel_ac97c      *chip  = (struct atmel_ac97c *)dev;
 653         irqreturn_t             retval = IRQ_NONE;
 654         u32                     sr     = ac97c_readl(chip, SR);
 655         u32                     casr   = ac97c_readl(chip, CASR);
 656         u32                     cosr   = ac97c_readl(chip, COSR);
 657         u32                     camr   = ac97c_readl(chip, CAMR);
 658
 659         if (sr & AC97C_SR_CAEVT) {
 660                 struct snd_pcm_runtime *runtime;
 661                 int offset, next_period, block_size;
 662                 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
 663                                 casr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
 664                                 casr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
 665                                 casr & AC97C_CSR_UNRUN   ? " UNRUN"   : "",
 666                                 casr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
 667                                 casr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
 668                                 !casr                    ? " NONE"    : "");
 669                 if (!cpu_is_at32ap7000()) {
 670                         if ((casr & camr) & AC97C_CSR_ENDTX) {
 671                                 runtime = chip->playback_substream->runtime;
 672                                 block_size = frames_to_bytes(runtime,
 673                                                 runtime->period_size);
 674                                 chip->playback_period++;
 675
 676                                 if (chip->playback_period == runtime->periods)
 677                                         chip->playback_period = 0;
 678                                 next_period = chip->playback_period + 1;
 679                                 if (next_period == runtime->periods)
 680                                         next_period = 0;
 681
 682                                 offset = block_size * next_period;
 683
 684                                 writel(runtime->dma_addr + offset,
 685                                                 chip->regs + ATMEL_PDC_TNPR);
 686                                 writel(block_size / 2,
 687                                                 chip->regs + ATMEL_PDC_TNCR);
 688
 689                                 snd_pcm_period_elapsed(
 690                                                 chip->playback_substream);
 691                         }
 692                         if ((casr & camr) & AC97C_CSR_ENDRX) {
 693                                 runtime = chip->capture_substream->runtime;
 694                                 block_size = frames_to_bytes(runtime,
 695                                                 runtime->period_size);
 696                                 chip->capture_period++;
 697
 698                                 if (chip->capture_period == runtime->periods)
 699                                         chip->capture_period = 0;
 700                                 next_period = chip->capture_period + 1;
 701                                 if (next_period == runtime->periods)
 702                                         next_period = 0;
 703
 704                                 offset = block_size * next_period;
 705
 706                                 writel(runtime->dma_addr + offset,
 707                                                 chip->regs + ATMEL_PDC_RNPR);
 708                                 writel(block_size / 2,
 709                                                 chip->regs + ATMEL_PDC_RNCR);
 710                                 snd_pcm_period_elapsed(chip->capture_substream);
 711                         }
 712                 }
 713                 retval = IRQ_HANDLED;
 714         }
 715
 716         if (sr & AC97C_SR_COEVT) {
 717                 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
 718                                 cosr & AC97C_CSR_OVRUN   ? " OVRUN"   : "",
 719                                 cosr & AC97C_CSR_RXRDY   ? " RXRDY"   : "",
 720                                 cosr & AC97C_CSR_TXEMPTY ? " TXEMPTY" : "",
 721                                 cosr & AC97C_CSR_TXRDY   ? " TXRDY"   : "",
 722                                 !cosr                    ? " NONE"    : "");
 723                 retval = IRQ_HANDLED;
 724         }
 725
 726         if (retval == IRQ_NONE) {
 727                 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
 728                                 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
 729         }
 730
 731         return retval;
 732 }
 733
 734 static struct ac97_pcm at91_ac97_pcm_defs[] = {
 735         /* Playback */
 736         {
 737                 .exclusive = 1,
 738                 .r = { {
 739                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 740                                   | (1 << AC97_SLOT_PCM_RIGHT)),
 741                 } },
 742         },
 743         /* PCM in */
 744         {
 745                 .stream = 1,
 746                 .exclusive = 1,
 747                 .r = { {
 748                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 749                                         | (1 << AC97_SLOT_PCM_RIGHT)),
 750                 } }
 751         },
 752         /* Mic in */
 753         {
 754                 .stream = 1,
 755                 .exclusive = 1,
 756                 .r = { {
 757                         .slots = (1<<AC97_SLOT_MIC),
 758                 } }
 759         },
 760 };
 761
 762 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
 763 {
 764         struct snd_pcm          *pcm;
 765         struct snd_pcm_hardware hw = atmel_ac97c_hw;
 766         int                     capture, playback, retval, err;
 767
 768         capture = test_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
 769         playback = test_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
 770
 771         if (!cpu_is_at32ap7000()) {
 772                 err = snd_ac97_pcm_assign(chip->ac97_bus,
 773                                 ARRAY_SIZE(at91_ac97_pcm_defs),
 774                                 at91_ac97_pcm_defs);
 775                 if (err)
 776                         return err;
 777         }
 778         retval = snd_pcm_new(chip->card, chip->card->shortname,
 779                         0, playback, capture, &pcm);
 780         if (retval)
 781                 return retval;
 782
 783         if (capture)
 784                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 785                                 &atmel_ac97_capture_ops);
 786         if (playback)
 787                 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 788                                 &atmel_ac97_playback_ops);
 789
 790         retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 791                         &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
 792                         hw.buffer_bytes_max);
 793         if (retval)
 794                 return retval;
 795
 796         pcm->private_data = chip;
 797         pcm->info_flags = 0;
 798         strcpy(pcm->name, chip->card->shortname);
 799         chip->pcm = pcm;
 800
 801         return 0;
 802 }
 803
 804 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
 805 {
 806         struct snd_ac97_template template;
 807         memset(&template, 0, sizeof(template));
 808         template.private_data = chip;
 809         return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
 810 }
 811
 812 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
 813                 unsigned short val)
 814 {
 815         struct atmel_ac97c *chip = get_chip(ac97);
 816         unsigned long word;
 817         int timeout = 40;
 818
 819         word = (reg & 0x7f) << 16 | val;
 820
 821         do {
 822                 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
 823                         ac97c_writel(chip, COTHR, word);
 824                         return;
 825                 }
 826                 udelay(1);
 827         } while (--timeout);
 828
 829         dev_dbg(&chip->pdev->dev, "codec write timeout\n");
 830 }
 831
 832 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
 833                 unsigned short reg)
 834 {
 835         struct atmel_ac97c *chip = get_chip(ac97);
 836         unsigned long word;
 837         int timeout = 40;
 838         int write = 10;
 839
 840         word = (0x80 | (reg & 0x7f)) << 16;
 841
 842         if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
 843                 ac97c_readl(chip, CORHR);
 844
 845 retry_write:
 846         timeout = 40;
 847
 848         do {
 849                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
 850                         ac97c_writel(chip, COTHR, word);
 851                         goto read_reg;
 852                 }
 853                 udelay(10);
 854         } while (--timeout);
 855
 856         if (!--write)
 857                 goto timed_out;
 858         goto retry_write;
 859
 860 read_reg:
 861         do {
 862                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
 863                         unsigned short val = ac97c_readl(chip, CORHR);
 864                         return val;
 865                 }
 866                 udelay(10);
 867         } while (--timeout);
 868
 869         if (!--write)
 870                 goto timed_out;
 871         goto retry_write;
 872
 873 timed_out:
 874         dev_dbg(&chip->pdev->dev, "codec read timeout\n");
 875         return 0xffff;
 876 }
 877
 878 static bool filter(struct dma_chan *chan, void *slave)
 879 {
 880         struct dw_dma_slave *dws = slave;
 881
 882         if (dws->dma_dev == chan->device->dev) {
 883                 chan->private = dws;
 884                 return true;
 885         } else
 886                 return false;
 887 }
 888
 889 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
 890 {
 891         ac97c_writel(chip, MR,   0);
 892         ac97c_writel(chip, MR,   AC97C_MR_ENA);
 893         ac97c_writel(chip, CAMR, 0);
 894         ac97c_writel(chip, COMR, 0);
 895
 896         if (gpio_is_valid(chip->reset_pin)) {
 897                 gpio_set_value(chip->reset_pin, 0);
 898                 /* AC97 v2.2 specifications says minimum 1 us. */
 899                 udelay(2);
 900                 gpio_set_value(chip->reset_pin, 1);
 901         } else {
 902                 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
 903                 udelay(2);
 904                 ac97c_writel(chip, MR, AC97C_MR_ENA);
 905         }
 906 }
 907
 908 #ifdef CONFIG_OF
 909 static const struct of_device_id atmel_ac97c_dt_ids[] = {
 910         { .compatible = "atmel,at91sam9263-ac97c", },
 911         { }
 912 };
 913 MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
 914
 915 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
 916 {
 917         struct ac97c_platform_data *pdata;
 918         struct device_node *node = dev->of_node;
 919
 920         if (!node) {
 921                 dev_err(dev, "Device does not have associated DT data\n");
 922                 return ERR_PTR(-EINVAL);
 923         }
 924
 925         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 926         if (!pdata)
 927                 return ERR_PTR(-ENOMEM);
 928
 929         pdata->reset_pin = of_get_named_gpio(dev->of_node, "ac97-gpios", 2);
 930
 931         return pdata;
 932 }
 933 #else
 934 static struct ac97c_platform_data *atmel_ac97c_probe_dt(struct device *dev)
 935 {
 936         dev_err(dev, "no platform data defined\n");
 937         return ERR_PTR(-ENXIO);
 938 }
 939 #endif
 940
 941 static int atmel_ac97c_probe(struct platform_device *pdev)
 942 {
 943         struct snd_card                 *card;
 944         struct atmel_ac97c              *chip;
 945         struct resource                 *regs;
 946         struct ac97c_platform_data      *pdata;
 947         struct clk                      *pclk;
 948         static struct snd_ac97_bus_ops  ops = {
 949                 .write  = atmel_ac97c_write,
 950                 .read   = atmel_ac97c_read,
 951         };
 952         int                             retval;
 953         int                             irq;
 954
 955         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 956         if (!regs) {
 957                 dev_dbg(&pdev->dev, "no memory resource\n");
 958                 return -ENXIO;
 959         }
 960
 961         pdata = dev_get_platdata(&pdev->dev);
 962         if (!pdata) {
 963                 pdata = atmel_ac97c_probe_dt(&pdev->dev);
 964                 if (IS_ERR(pdata))
 965                         return PTR_ERR(pdata);
 966         }
 967
 968         irq = platform_get_irq(pdev, 0);
 969         if (irq < 0) {
 970                 dev_dbg(&pdev->dev, "could not get irq\n");
 971                 return -ENXIO;
 972         }
 973
 974         if (cpu_is_at32ap7000()) {
 975                 pclk = clk_get(&pdev->dev, "pclk");
 976         } else {
 977                 pclk = clk_get(&pdev->dev, "ac97_clk");
 978         }
 979
 980         if (IS_ERR(pclk)) {
 981                 dev_dbg(&pdev->dev, "no peripheral clock\n");
 982                 return PTR_ERR(pclk);
 983         }
 984         clk_prepare_enable(pclk);
 985
 986         retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
 987                               SNDRV_DEFAULT_STR1, THIS_MODULE,
 988                               sizeof(struct atmel_ac97c), &card);
 989         if (retval) {
 990                 dev_dbg(&pdev->dev, "could not create sound card device\n");
 991                 goto err_snd_card_new;
 992         }
 993
 994         chip = get_chip(card);
 995
 996         retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
 997         if (retval) {
 998                 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
 999                 goto err_request_irq;
1000         }
1001         chip->irq = irq;
1002
1003         spin_lock_init(&chip->lock);
1004
1005         strcpy(card->driver, "Atmel AC97C");
1006         strcpy(card->shortname, "Atmel AC97C");
1007         sprintf(card->longname, "Atmel AC97 controller");
1008
1009         chip->card = card;
1010         chip->pclk = pclk;
1011         chip->pdev = pdev;
1012         chip->regs = ioremap(regs->start, resource_size(regs));
1013
1014         if (!chip->regs) {
1015                 dev_dbg(&pdev->dev, "could not remap register memory\n");
1016                 retval = -ENOMEM;
1017                 goto err_ioremap;
1018         }
1019
1020         if (gpio_is_valid(pdata->reset_pin)) {
1021                 if (gpio_request(pdata->reset_pin, "reset_pin")) {
1022                         dev_dbg(&pdev->dev, "reset pin not available\n");
1023                         chip->reset_pin = -ENODEV;
1024                 } else {
1025                         gpio_direction_output(pdata->reset_pin, 1);
1026                         chip->reset_pin = pdata->reset_pin;
1027                 }
1028         } else {
1029                 chip->reset_pin = -EINVAL;
1030         }
1031
1032         atmel_ac97c_reset(chip);
1033
1034         /* Enable overrun interrupt from codec channel */
1035         ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
1036         ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
1037
1038         retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
1039         if (retval) {
1040                 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
1041                 goto err_ac97_bus;
1042         }
1043
1044         retval = atmel_ac97c_mixer_new(chip);
1045         if (retval) {
1046                 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
1047                 goto err_ac97_bus;
1048         }
1049
1050         if (cpu_is_at32ap7000()) {
1051                 if (pdata->rx_dws.dma_dev) {
1052                         dma_cap_mask_t mask;
1053
1054                         dma_cap_zero(mask);
1055                         dma_cap_set(DMA_SLAVE, mask);
1056
1057                         chip->dma.rx_chan = dma_request_channel(mask, filter,
1058                                                                 &pdata->rx_dws);
1059                         if (chip->dma.rx_chan) {
1060                                 struct dma_slave_config dma_conf = {
1061                                         .src_addr = regs->start + AC97C_CARHR +
1062                                                 2,
1063                                         .src_addr_width =
1064                                                 DMA_SLAVE_BUSWIDTH_2_BYTES,
1065                                         .src_maxburst = 1,
1066                                         .dst_maxburst = 1,
1067                                         .direction = DMA_DEV_TO_MEM,
1068                                         .device_fc = false,
1069                                 };
1070
1071                                 dmaengine_slave_config(chip->dma.rx_chan,
1072                                                 &dma_conf);
1073                         }
1074
1075                         dev_info(&chip->pdev->dev, "using %s for DMA RX\n",
1076                                 dev_name(&chip->dma.rx_chan->dev->device));
1077                         set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1078                 }
1079
1080                 if (pdata->tx_dws.dma_dev) {
1081                         dma_cap_mask_t mask;
1082
1083                         dma_cap_zero(mask);
1084                         dma_cap_set(DMA_SLAVE, mask);
1085
1086                         chip->dma.tx_chan = dma_request_channel(mask, filter,
1087                                                                 &pdata->tx_dws);
1088                         if (chip->dma.tx_chan) {
1089                                 struct dma_slave_config dma_conf = {
1090                                         .dst_addr = regs->start + AC97C_CATHR +
1091                                                 2,
1092                                         .dst_addr_width =
1093                                                 DMA_SLAVE_BUSWIDTH_2_BYTES,
1094                                         .src_maxburst = 1,
1095                                         .dst_maxburst = 1,
1096                                         .direction = DMA_MEM_TO_DEV,
1097                                         .device_fc = false,
1098                                 };
1099
1100                                 dmaengine_slave_config(chip->dma.tx_chan,
1101                                                 &dma_conf);
1102                         }
1103
1104                         dev_info(&chip->pdev->dev, "using %s for DMA TX\n",
1105                                 dev_name(&chip->dma.tx_chan->dev->device));
1106                         set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1107                 }
1108
1109                 if (!test_bit(DMA_RX_CHAN_PRESENT, &chip->flags) &&
1110                                 !test_bit(DMA_TX_CHAN_PRESENT, &chip->flags)) {
1111                         dev_dbg(&pdev->dev, "DMA not available\n");
1112                         retval = -ENODEV;
1113                         goto err_dma;
1114                 }
1115         } else {
1116                 /* Just pretend that we have DMA channel(for at91 i is actually
1117                  * the PDC) */
1118                 set_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1119                 set_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1120         }
1121
1122         retval = atmel_ac97c_pcm_new(chip);
1123         if (retval) {
1124                 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
1125                 goto err_dma;
1126         }
1127
1128         retval = snd_card_register(card);
1129         if (retval) {
1130                 dev_dbg(&pdev->dev, "could not register sound card\n");
1131                 goto err_dma;
1132         }
1133
1134         platform_set_drvdata(pdev, card);
1135
1136         dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
1137                         chip->regs, irq);
1138
1139         return 0;
1140
1141 err_dma:
1142         if (cpu_is_at32ap7000()) {
1143                 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1144                         dma_release_channel(chip->dma.rx_chan);
1145                 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1146                         dma_release_channel(chip->dma.tx_chan);
1147                 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1148                 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1149                 chip->dma.rx_chan = NULL;
1150                 chip->dma.tx_chan = NULL;
1151         }
1152 err_ac97_bus:
1153         if (gpio_is_valid(chip->reset_pin))
1154                 gpio_free(chip->reset_pin);
1155
1156         iounmap(chip->regs);
1157 err_ioremap:
1158         free_irq(irq, chip);
1159 err_request_irq:
1160         snd_card_free(card);
1161 err_snd_card_new:
1162         clk_disable_unprepare(pclk);
1163         clk_put(pclk);
1164         return retval;
1165 }
1166
1167 #ifdef CONFIG_PM_SLEEP
1168 static int atmel_ac97c_suspend(struct device *pdev)
1169 {
1170         struct snd_card *card = dev_get_drvdata(pdev);
1171         struct atmel_ac97c *chip = card->private_data;
1172
1173         if (cpu_is_at32ap7000()) {
1174                 if (test_bit(DMA_RX_READY, &chip->flags))
1175                         dw_dma_cyclic_stop(chip->dma.rx_chan);
1176                 if (test_bit(DMA_TX_READY, &chip->flags))
1177                         dw_dma_cyclic_stop(chip->dma.tx_chan);
1178         }
1179         clk_disable_unprepare(chip->pclk);
1180
1181         return 0;
1182 }
1183
1184 static int atmel_ac97c_resume(struct device *pdev)
1185 {
1186         struct snd_card *card = dev_get_drvdata(pdev);
1187         struct atmel_ac97c *chip = card->private_data;
1188
1189         clk_prepare_enable(chip->pclk);
1190         if (cpu_is_at32ap7000()) {
1191                 if (test_bit(DMA_RX_READY, &chip->flags))
1192                         dw_dma_cyclic_start(chip->dma.rx_chan);
1193                 if (test_bit(DMA_TX_READY, &chip->flags))
1194                         dw_dma_cyclic_start(chip->dma.tx_chan);
1195         }
1196         return 0;
1197 }
1198
1199 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
1200 #define ATMEL_AC97C_PM_OPS      &atmel_ac97c_pm
1201 #else
1202 #define ATMEL_AC97C_PM_OPS      NULL
1203 #endif
1204
1205 static int atmel_ac97c_remove(struct platform_device *pdev)
1206 {
1207         struct snd_card *card = platform_get_drvdata(pdev);
1208         struct atmel_ac97c *chip = get_chip(card);
1209
1210         if (gpio_is_valid(chip->reset_pin))
1211                 gpio_free(chip->reset_pin);
1212
1213         ac97c_writel(chip, CAMR, 0);
1214         ac97c_writel(chip, COMR, 0);
1215         ac97c_writel(chip, MR,   0);
1216
1217         clk_disable_unprepare(chip->pclk);
1218         clk_put(chip->pclk);
1219         iounmap(chip->regs);
1220         free_irq(chip->irq, chip);
1221
1222         if (cpu_is_at32ap7000()) {
1223                 if (test_bit(DMA_RX_CHAN_PRESENT, &chip->flags))
1224                         dma_release_channel(chip->dma.rx_chan);
1225                 if (test_bit(DMA_TX_CHAN_PRESENT, &chip->flags))
1226                         dma_release_channel(chip->dma.tx_chan);
1227                 clear_bit(DMA_RX_CHAN_PRESENT, &chip->flags);
1228                 clear_bit(DMA_TX_CHAN_PRESENT, &chip->flags);
1229                 chip->dma.rx_chan = NULL;
1230                 chip->dma.tx_chan = NULL;
1231         }
1232
1233         snd_card_free(card);
1234
1235         return 0;
1236 }
1237
1238 static struct platform_driver atmel_ac97c_driver = {
1239         .probe          = atmel_ac97c_probe,
1240         .remove         = atmel_ac97c_remove,
1241         .driver         = {
1242                 .name   = "atmel_ac97c",
1243                 .pm     = ATMEL_AC97C_PM_OPS,
1244                 .of_match_table = of_match_ptr(atmel_ac97c_dt_ids),
1245         },
1246 };
1247 module_platform_driver(atmel_ac97c_driver);
1248
1249 MODULE_LICENSE("GPL");
1250 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
1251 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");