sound/atmel/ac97c.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for Atmel AC97C
   4  *
   5  * Copyright (C) 2005-2009 Atmel Corporation
   6  */
   7 #include <linux/clk.h>
   8 #include <linux/delay.h>
   9 #include <linux/bitmap.h>
  10 #include <linux/device.h>
  11 #include <linux/atmel_pdc.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/mutex.h>
  18 #include <linux/types.h>
  19 #include <linux/io.h>
  20 #include <linux/of.h>
  21 #include <linux/of_device.h>
  22
  23 #include <sound/core.h>
  24 #include <sound/initval.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/ac97_codec.h>
  28 #include <sound/memalloc.h>
  29
  30 #include "ac97c.h"
  31
  32 /* Serialize access to opened variable */
  33 static DEFINE_MUTEX(opened_mutex);
  34
  35 struct atmel_ac97c {
  36         struct clk                      *pclk;
  37         struct platform_device          *pdev;
  38
  39         struct snd_pcm_substream        *playback_substream;
  40         struct snd_pcm_substream        *capture_substream;
  41         struct snd_card                 *card;
  42         struct snd_pcm                  *pcm;
  43         struct snd_ac97                 *ac97;
  44         struct snd_ac97_bus             *ac97_bus;
  45
  46         u64                             cur_format;
  47         unsigned int                    cur_rate;
  48         int                             playback_period, capture_period;
  49         /* Serialize access to opened variable */
  50         spinlock_t                      lock;
  51         void __iomem                    *regs;
  52         int                             irq;
  53         int                             opened;
  54         struct gpio_desc                *reset_pin;
  55 };
  56
  57 #define get_chip(card) ((struct atmel_ac97c *)(card)->private_data)
  58
  59 #define ac97c_writel(chip, reg, val)                    \
  60         __raw_writel((val), (chip)->regs + AC97C_##reg)
  61 #define ac97c_readl(chip, reg)                          \
  62         __raw_readl((chip)->regs + AC97C_##reg)
  63
  64 static const struct snd_pcm_hardware atmel_ac97c_hw = {
  65         .info                   = (SNDRV_PCM_INFO_MMAP
  66                                   | SNDRV_PCM_INFO_MMAP_VALID
  67                                   | SNDRV_PCM_INFO_INTERLEAVED
  68                                   | SNDRV_PCM_INFO_BLOCK_TRANSFER
  69                                   | SNDRV_PCM_INFO_JOINT_DUPLEX
  70                                   | SNDRV_PCM_INFO_RESUME
  71                                   | SNDRV_PCM_INFO_PAUSE),
  72         .formats                = (SNDRV_PCM_FMTBIT_S16_BE
  73                                   | SNDRV_PCM_FMTBIT_S16_LE),
  74         .rates                  = (SNDRV_PCM_RATE_CONTINUOUS),
  75         .rate_min               = 4000,
  76         .rate_max               = 48000,
  77         .channels_min           = 1,
  78         .channels_max           = 2,
  79         .buffer_bytes_max       = 2 * 2 * 64 * 2048,
  80         .period_bytes_min       = 4096,
  81         .period_bytes_max       = 4096,
  82         .periods_min            = 6,
  83         .periods_max            = 64,
  84 };
  85
  86 static int atmel_ac97c_playback_open(struct snd_pcm_substream *substream)
  87 {
  88         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
  89         struct snd_pcm_runtime *runtime = substream->runtime;
  90
  91         mutex_lock(&opened_mutex);
  92         chip->opened++;
  93         runtime->hw = atmel_ac97c_hw;
  94         if (chip->cur_rate) {
  95                 runtime->hw.rate_min = chip->cur_rate;
  96                 runtime->hw.rate_max = chip->cur_rate;
  97         }
  98         if (chip->cur_format)
  99                 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
 100         mutex_unlock(&opened_mutex);
 101         chip->playback_substream = substream;
 102         return 0;
 103 }
 104
 105 static int atmel_ac97c_capture_open(struct snd_pcm_substream *substream)
 106 {
 107         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 108         struct snd_pcm_runtime *runtime = substream->runtime;
 109
 110         mutex_lock(&opened_mutex);
 111         chip->opened++;
 112         runtime->hw = atmel_ac97c_hw;
 113         if (chip->cur_rate) {
 114                 runtime->hw.rate_min = chip->cur_rate;
 115                 runtime->hw.rate_max = chip->cur_rate;
 116         }
 117         if (chip->cur_format)
 118                 runtime->hw.formats = pcm_format_to_bits(chip->cur_format);
 119         mutex_unlock(&opened_mutex);
 120         chip->capture_substream = substream;
 121         return 0;
 122 }
 123
 124 static int atmel_ac97c_playback_close(struct snd_pcm_substream *substream)
 125 {
 126         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 127
 128         mutex_lock(&opened_mutex);
 129         chip->opened--;
 130         if (!chip->opened) {
 131                 chip->cur_rate = 0;
 132                 chip->cur_format = 0;
 133         }
 134         mutex_unlock(&opened_mutex);
 135
 136         chip->playback_substream = NULL;
 137
 138         return 0;
 139 }
 140
 141 static int atmel_ac97c_capture_close(struct snd_pcm_substream *substream)
 142 {
 143         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 144
 145         mutex_lock(&opened_mutex);
 146         chip->opened--;
 147         if (!chip->opened) {
 148                 chip->cur_rate = 0;
 149                 chip->cur_format = 0;
 150         }
 151         mutex_unlock(&opened_mutex);
 152
 153         chip->capture_substream = NULL;
 154
 155         return 0;
 156 }
 157
 158 static int atmel_ac97c_playback_hw_params(struct snd_pcm_substream *substream,
 159                 struct snd_pcm_hw_params *hw_params)
 160 {
 161         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 162
 163         /* Set restrictions to params. */
 164         mutex_lock(&opened_mutex);
 165         chip->cur_rate = params_rate(hw_params);
 166         chip->cur_format = params_format(hw_params);
 167         mutex_unlock(&opened_mutex);
 168
 169         return 0;
 170 }
 171
 172 static int atmel_ac97c_capture_hw_params(struct snd_pcm_substream *substream,
 173                 struct snd_pcm_hw_params *hw_params)
 174 {
 175         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 176
 177         /* Set restrictions to params. */
 178         mutex_lock(&opened_mutex);
 179         chip->cur_rate = params_rate(hw_params);
 180         chip->cur_format = params_format(hw_params);
 181         mutex_unlock(&opened_mutex);
 182
 183         return 0;
 184 }
 185
 186 static int atmel_ac97c_playback_prepare(struct snd_pcm_substream *substream)
 187 {
 188         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 189         struct snd_pcm_runtime *runtime = substream->runtime;
 190         int block_size = frames_to_bytes(runtime, runtime->period_size);
 191         unsigned long word = ac97c_readl(chip, OCA);
 192         int retval;
 193
 194         chip->playback_period = 0;
 195         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 196
 197         /* assign channels to AC97C channel A */
 198         switch (runtime->channels) {
 199         case 1:
 200                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 201                 break;
 202         case 2:
 203                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 204                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 205                 break;
 206         default:
 207                 /* TODO: support more than two channels */
 208                 return -EINVAL;
 209         }
 210         ac97c_writel(chip, OCA, word);
 211
 212         /* configure sample format and size */
 213         word = ac97c_readl(chip, CAMR);
 214         if (chip->opened <= 1)
 215                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 216         else
 217                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 218
 219         switch (runtime->format) {
 220         case SNDRV_PCM_FORMAT_S16_LE:
 221                 break;
 222         case SNDRV_PCM_FORMAT_S16_BE:
 223                 word &= ~(AC97C_CMR_CEM_LITTLE);
 224                 break;
 225         default:
 226                 word = ac97c_readl(chip, OCA);
 227                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 228                 ac97c_writel(chip, OCA, word);
 229                 return -EINVAL;
 230         }
 231
 232         /* Enable underrun interrupt on channel A */
 233         word |= AC97C_CSR_UNRUN;
 234
 235         ac97c_writel(chip, CAMR, word);
 236
 237         /* Enable channel A event interrupt */
 238         word = ac97c_readl(chip, IMR);
 239         word |= AC97C_SR_CAEVT;
 240         ac97c_writel(chip, IER, word);
 241
 242         /* set variable rate if needed */
 243         if (runtime->rate != 48000) {
 244                 word = ac97c_readl(chip, MR);
 245                 word |= AC97C_MR_VRA;
 246                 ac97c_writel(chip, MR, word);
 247         } else {
 248                 word = ac97c_readl(chip, MR);
 249                 word &= ~(AC97C_MR_VRA);
 250                 ac97c_writel(chip, MR, word);
 251         }
 252
 253         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_FRONT_DAC_RATE,
 254                         runtime->rate);
 255         if (retval)
 256                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 257                                 runtime->rate);
 258
 259         /* Initialize and start the PDC */
 260         writel(runtime->dma_addr, chip->regs + ATMEL_PDC_TPR);
 261         writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
 262         writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_TNPR);
 263         writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
 264
 265         return retval;
 266 }
 267
 268 static int atmel_ac97c_capture_prepare(struct snd_pcm_substream *substream)
 269 {
 270         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 271         struct snd_pcm_runtime *runtime = substream->runtime;
 272         int block_size = frames_to_bytes(runtime, runtime->period_size);
 273         unsigned long word = ac97c_readl(chip, ICA);
 274         int retval;
 275
 276         chip->capture_period = 0;
 277         word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 278
 279         /* assign channels to AC97C channel A */
 280         switch (runtime->channels) {
 281         case 1:
 282                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A);
 283                 break;
 284         case 2:
 285                 word |= AC97C_CH_ASSIGN(PCM_LEFT, A)
 286                         | AC97C_CH_ASSIGN(PCM_RIGHT, A);
 287                 break;
 288         default:
 289                 /* TODO: support more than two channels */
 290                 return -EINVAL;
 291         }
 292         ac97c_writel(chip, ICA, word);
 293
 294         /* configure sample format and size */
 295         word = ac97c_readl(chip, CAMR);
 296         if (chip->opened <= 1)
 297                 word = AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 298         else
 299                 word |= AC97C_CMR_DMAEN | AC97C_CMR_SIZE_16;
 300
 301         switch (runtime->format) {
 302         case SNDRV_PCM_FORMAT_S16_LE:
 303                 break;
 304         case SNDRV_PCM_FORMAT_S16_BE:
 305                 word &= ~(AC97C_CMR_CEM_LITTLE);
 306                 break;
 307         default:
 308                 word = ac97c_readl(chip, ICA);
 309                 word &= ~(AC97C_CH_MASK(PCM_LEFT) | AC97C_CH_MASK(PCM_RIGHT));
 310                 ac97c_writel(chip, ICA, word);
 311                 return -EINVAL;
 312         }
 313
 314         /* Enable overrun interrupt on channel A */
 315         word |= AC97C_CSR_OVRUN;
 316
 317         ac97c_writel(chip, CAMR, word);
 318
 319         /* Enable channel A event interrupt */
 320         word = ac97c_readl(chip, IMR);
 321         word |= AC97C_SR_CAEVT;
 322         ac97c_writel(chip, IER, word);
 323
 324         /* set variable rate if needed */
 325         if (runtime->rate != 48000) {
 326                 word = ac97c_readl(chip, MR);
 327                 word |= AC97C_MR_VRA;
 328                 ac97c_writel(chip, MR, word);
 329         } else {
 330                 word = ac97c_readl(chip, MR);
 331                 word &= ~(AC97C_MR_VRA);
 332                 ac97c_writel(chip, MR, word);
 333         }
 334
 335         retval = snd_ac97_set_rate(chip->ac97, AC97_PCM_LR_ADC_RATE,
 336                         runtime->rate);
 337         if (retval)
 338                 dev_dbg(&chip->pdev->dev, "could not set rate %d Hz\n",
 339                                 runtime->rate);
 340
 341         /* Initialize and start the PDC */
 342         writel(runtime->dma_addr, chip->regs + ATMEL_PDC_RPR);
 343         writel(block_size / 2, chip->regs + ATMEL_PDC_RCR);
 344         writel(runtime->dma_addr + block_size, chip->regs + ATMEL_PDC_RNPR);
 345         writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
 346
 347         return retval;
 348 }
 349
 350 static int
 351 atmel_ac97c_playback_trigger(struct snd_pcm_substream *substream, int cmd)
 352 {
 353         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 354         unsigned long camr, ptcr = 0;
 355
 356         camr = ac97c_readl(chip, CAMR);
 357
 358         switch (cmd) {
 359         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 360         case SNDRV_PCM_TRIGGER_RESUME:
 361         case SNDRV_PCM_TRIGGER_START:
 362                 ptcr = ATMEL_PDC_TXTEN;
 363                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDTX;
 364                 break;
 365         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 366         case SNDRV_PCM_TRIGGER_SUSPEND:
 367         case SNDRV_PCM_TRIGGER_STOP:
 368                 ptcr |= ATMEL_PDC_TXTDIS;
 369                 if (chip->opened <= 1)
 370                         camr &= ~AC97C_CMR_CENA;
 371                 break;
 372         default:
 373                 return -EINVAL;
 374         }
 375
 376         ac97c_writel(chip, CAMR, camr);
 377         writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 378         return 0;
 379 }
 380
 381 static int
 382 atmel_ac97c_capture_trigger(struct snd_pcm_substream *substream, int cmd)
 383 {
 384         struct atmel_ac97c *chip = snd_pcm_substream_chip(substream);
 385         unsigned long camr, ptcr = 0;
 386
 387         camr = ac97c_readl(chip, CAMR);
 388         ptcr = readl(chip->regs + ATMEL_PDC_PTSR);
 389
 390         switch (cmd) {
 391         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 392         case SNDRV_PCM_TRIGGER_RESUME:
 393         case SNDRV_PCM_TRIGGER_START:
 394                 ptcr = ATMEL_PDC_RXTEN;
 395                 camr |= AC97C_CMR_CENA | AC97C_CSR_ENDRX;
 396                 break;
 397         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 398         case SNDRV_PCM_TRIGGER_SUSPEND:
 399         case SNDRV_PCM_TRIGGER_STOP:
 400                 ptcr |= ATMEL_PDC_RXTDIS;
 401                 if (chip->opened <= 1)
 402                         camr &= ~AC97C_CMR_CENA;
 403                 break;
 404         default:
 405                 return -EINVAL;
 406         }
 407
 408         ac97c_writel(chip, CAMR, camr);
 409         writel(ptcr, chip->regs + ATMEL_PDC_PTCR);
 410         return 0;
 411 }
 412
 413 static snd_pcm_uframes_t
 414 atmel_ac97c_playback_pointer(struct snd_pcm_substream *substream)
 415 {
 416         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 417         struct snd_pcm_runtime  *runtime = substream->runtime;
 418         snd_pcm_uframes_t       frames;
 419         unsigned long           bytes;
 420
 421         bytes = readl(chip->regs + ATMEL_PDC_TPR);
 422         bytes -= runtime->dma_addr;
 423
 424         frames = bytes_to_frames(runtime, bytes);
 425         if (frames >= runtime->buffer_size)
 426                 frames -= runtime->buffer_size;
 427         return frames;
 428 }
 429
 430 static snd_pcm_uframes_t
 431 atmel_ac97c_capture_pointer(struct snd_pcm_substream *substream)
 432 {
 433         struct atmel_ac97c      *chip = snd_pcm_substream_chip(substream);
 434         struct snd_pcm_runtime  *runtime = substream->runtime;
 435         snd_pcm_uframes_t       frames;
 436         unsigned long           bytes;
 437
 438         bytes = readl(chip->regs + ATMEL_PDC_RPR);
 439         bytes -= runtime->dma_addr;
 440
 441         frames = bytes_to_frames(runtime, bytes);
 442         if (frames >= runtime->buffer_size)
 443                 frames -= runtime->buffer_size;
 444         return frames;
 445 }
 446
 447 static const struct snd_pcm_ops atmel_ac97_playback_ops = {
 448         .open           = atmel_ac97c_playback_open,
 449         .close          = atmel_ac97c_playback_close,
 450         .hw_params      = atmel_ac97c_playback_hw_params,
 451         .prepare        = atmel_ac97c_playback_prepare,
 452         .trigger        = atmel_ac97c_playback_trigger,
 453         .pointer        = atmel_ac97c_playback_pointer,
 454 };
 455
 456 static const struct snd_pcm_ops atmel_ac97_capture_ops = {
 457         .open           = atmel_ac97c_capture_open,
 458         .close          = atmel_ac97c_capture_close,
 459         .hw_params      = atmel_ac97c_capture_hw_params,
 460         .prepare        = atmel_ac97c_capture_prepare,
 461         .trigger        = atmel_ac97c_capture_trigger,
 462         .pointer        = atmel_ac97c_capture_pointer,
 463 };
 464
 465 static irqreturn_t atmel_ac97c_interrupt(int irq, void *dev)
 466 {
 467         struct atmel_ac97c      *chip  = (struct atmel_ac97c *)dev;
 468         irqreturn_t             retval = IRQ_NONE;
 469         u32                     sr     = ac97c_readl(chip, SR);
 470         u32                     casr   = ac97c_readl(chip, CASR);
 471         u32                     cosr   = ac97c_readl(chip, COSR);
 472         u32                     camr   = ac97c_readl(chip, CAMR);
 473
 474         if (sr & AC97C_SR_CAEVT) {
 475                 struct snd_pcm_runtime *runtime;
 476                 int offset, next_period, block_size;
 477                 dev_dbg(&chip->pdev->dev, "channel A event%s%s%s%s%s%s\n",
 478                         (casr & AC97C_CSR_OVRUN)   ? " OVRUN"   : "",
 479                         (casr & AC97C_CSR_RXRDY)   ? " RXRDY"   : "",
 480                         (casr & AC97C_CSR_UNRUN)   ? " UNRUN"   : "",
 481                         (casr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "",
 482                         (casr & AC97C_CSR_TXRDY)   ? " TXRDY"   : "",
 483                         !casr                      ? " NONE"    : "");
 484                 if ((casr & camr) & AC97C_CSR_ENDTX) {
 485                         runtime = chip->playback_substream->runtime;
 486                         block_size = frames_to_bytes(runtime, runtime->period_size);
 487                         chip->playback_period++;
 488
 489                         if (chip->playback_period == runtime->periods)
 490                                 chip->playback_period = 0;
 491                         next_period = chip->playback_period + 1;
 492                         if (next_period == runtime->periods)
 493                                 next_period = 0;
 494
 495                         offset = block_size * next_period;
 496
 497                         writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_TNPR);
 498                         writel(block_size / 2, chip->regs + ATMEL_PDC_TNCR);
 499
 500                         snd_pcm_period_elapsed(chip->playback_substream);
 501                 }
 502                 if ((casr & camr) & AC97C_CSR_ENDRX) {
 503                         runtime = chip->capture_substream->runtime;
 504                         block_size = frames_to_bytes(runtime, runtime->period_size);
 505                         chip->capture_period++;
 506
 507                         if (chip->capture_period == runtime->periods)
 508                                 chip->capture_period = 0;
 509                         next_period = chip->capture_period + 1;
 510                         if (next_period == runtime->periods)
 511                                 next_period = 0;
 512
 513                         offset = block_size * next_period;
 514
 515                         writel(runtime->dma_addr + offset, chip->regs + ATMEL_PDC_RNPR);
 516                         writel(block_size / 2, chip->regs + ATMEL_PDC_RNCR);
 517                         snd_pcm_period_elapsed(chip->capture_substream);
 518                 }
 519                 retval = IRQ_HANDLED;
 520         }
 521
 522         if (sr & AC97C_SR_COEVT) {
 523                 dev_info(&chip->pdev->dev, "codec channel event%s%s%s%s%s\n",
 524                          (cosr & AC97C_CSR_OVRUN)   ? " OVRUN"   : "",
 525                          (cosr & AC97C_CSR_RXRDY)   ? " RXRDY"   : "",
 526                          (cosr & AC97C_CSR_TXEMPTY) ? " TXEMPTY" : "",
 527                          (cosr & AC97C_CSR_TXRDY)   ? " TXRDY"   : "",
 528                          !cosr                      ? " NONE"    : "");
 529                 retval = IRQ_HANDLED;
 530         }
 531
 532         if (retval == IRQ_NONE) {
 533                 dev_err(&chip->pdev->dev, "spurious interrupt sr 0x%08x "
 534                                 "casr 0x%08x cosr 0x%08x\n", sr, casr, cosr);
 535         }
 536
 537         return retval;
 538 }
 539
 540 static const struct ac97_pcm at91_ac97_pcm_defs[] = {
 541         /* Playback */
 542         {
 543                 .exclusive = 1,
 544                 .r = { {
 545                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 546                                   | (1 << AC97_SLOT_PCM_RIGHT)),
 547                 } },
 548         },
 549         /* PCM in */
 550         {
 551                 .stream = 1,
 552                 .exclusive = 1,
 553                 .r = { {
 554                         .slots = ((1 << AC97_SLOT_PCM_LEFT)
 555                                         | (1 << AC97_SLOT_PCM_RIGHT)),
 556                 } }
 557         },
 558         /* Mic in */
 559         {
 560                 .stream = 1,
 561                 .exclusive = 1,
 562                 .r = { {
 563                         .slots = (1<<AC97_SLOT_MIC),
 564                 } }
 565         },
 566 };
 567
 568 static int atmel_ac97c_pcm_new(struct atmel_ac97c *chip)
 569 {
 570         struct snd_pcm          *pcm;
 571         struct snd_pcm_hardware hw = atmel_ac97c_hw;
 572         int                     retval;
 573
 574         retval = snd_ac97_pcm_assign(chip->ac97_bus,
 575                                      ARRAY_SIZE(at91_ac97_pcm_defs),
 576                                      at91_ac97_pcm_defs);
 577         if (retval)
 578                 return retval;
 579
 580         retval = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
 581         if (retval)
 582                 return retval;
 583
 584         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &atmel_ac97_capture_ops);
 585         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &atmel_ac97_playback_ops);
 586
 587         snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
 588                         &chip->pdev->dev, hw.periods_min * hw.period_bytes_min,
 589                         hw.buffer_bytes_max);
 590
 591         pcm->private_data = chip;
 592         pcm->info_flags = 0;
 593         strcpy(pcm->name, chip->card->shortname);
 594         chip->pcm = pcm;
 595
 596         return 0;
 597 }
 598
 599 static int atmel_ac97c_mixer_new(struct atmel_ac97c *chip)
 600 {
 601         struct snd_ac97_template template;
 602         memset(&template, 0, sizeof(template));
 603         template.private_data = chip;
 604         return snd_ac97_mixer(chip->ac97_bus, &template, &chip->ac97);
 605 }
 606
 607 static void atmel_ac97c_write(struct snd_ac97 *ac97, unsigned short reg,
 608                 unsigned short val)
 609 {
 610         struct atmel_ac97c *chip = get_chip(ac97);
 611         unsigned long word;
 612         int timeout = 40;
 613
 614         word = (reg & 0x7f) << 16 | val;
 615
 616         do {
 617                 if (ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) {
 618                         ac97c_writel(chip, COTHR, word);
 619                         return;
 620                 }
 621                 udelay(1);
 622         } while (--timeout);
 623
 624         dev_dbg(&chip->pdev->dev, "codec write timeout\n");
 625 }
 626
 627 static unsigned short atmel_ac97c_read(struct snd_ac97 *ac97,
 628                 unsigned short reg)
 629 {
 630         struct atmel_ac97c *chip = get_chip(ac97);
 631         unsigned long word;
 632         int timeout = 40;
 633         int write = 10;
 634
 635         word = (0x80 | (reg & 0x7f)) << 16;
 636
 637         if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0)
 638                 ac97c_readl(chip, CORHR);
 639
 640 retry_write:
 641         timeout = 40;
 642
 643         do {
 644                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_TXRDY) != 0) {
 645                         ac97c_writel(chip, COTHR, word);
 646                         goto read_reg;
 647                 }
 648                 udelay(10);
 649         } while (--timeout);
 650
 651         if (!--write)
 652                 goto timed_out;
 653         goto retry_write;
 654
 655 read_reg:
 656         do {
 657                 if ((ac97c_readl(chip, COSR) & AC97C_CSR_RXRDY) != 0) {
 658                         unsigned short val = ac97c_readl(chip, CORHR);
 659                         return val;
 660                 }
 661                 udelay(10);
 662         } while (--timeout);
 663
 664         if (!--write)
 665                 goto timed_out;
 666         goto retry_write;
 667
 668 timed_out:
 669         dev_dbg(&chip->pdev->dev, "codec read timeout\n");
 670         return 0xffff;
 671 }
 672
 673 static void atmel_ac97c_reset(struct atmel_ac97c *chip)
 674 {
 675         ac97c_writel(chip, MR,   0);
 676         ac97c_writel(chip, MR,   AC97C_MR_ENA);
 677         ac97c_writel(chip, CAMR, 0);
 678         ac97c_writel(chip, COMR, 0);
 679
 680         if (!IS_ERR(chip->reset_pin)) {
 681                 gpiod_set_value(chip->reset_pin, 0);
 682                 /* AC97 v2.2 specifications says minimum 1 us. */
 683                 udelay(2);
 684                 gpiod_set_value(chip->reset_pin, 1);
 685         } else {
 686                 ac97c_writel(chip, MR, AC97C_MR_WRST | AC97C_MR_ENA);
 687                 udelay(2);
 688                 ac97c_writel(chip, MR, AC97C_MR_ENA);
 689         }
 690 }
 691
 692 static const struct of_device_id atmel_ac97c_dt_ids[] = {
 693         { .compatible = "atmel,at91sam9263-ac97c", },
 694         { }
 695 };
 696 MODULE_DEVICE_TABLE(of, atmel_ac97c_dt_ids);
 697
 698 static int atmel_ac97c_probe(struct platform_device *pdev)
 699 {
 700         struct device                   *dev = &pdev->dev;
 701         struct snd_card                 *card;
 702         struct atmel_ac97c              *chip;
 703         struct resource                 *regs;
 704         struct clk                      *pclk;
 705         static const struct snd_ac97_bus_ops    ops = {
 706                 .write  = atmel_ac97c_write,
 707                 .read   = atmel_ac97c_read,
 708         };
 709         int                             retval;
 710         int                             irq;
 711
 712         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 713         if (!regs) {
 714                 dev_dbg(&pdev->dev, "no memory resource\n");
 715                 return -ENXIO;
 716         }
 717
 718         irq = platform_get_irq(pdev, 0);
 719         if (irq < 0) {
 720                 dev_dbg(&pdev->dev, "could not get irq: %d\n", irq);
 721                 return irq;
 722         }
 723
 724         pclk = clk_get(&pdev->dev, "ac97_clk");
 725         if (IS_ERR(pclk)) {
 726                 dev_dbg(&pdev->dev, "no peripheral clock\n");
 727                 return PTR_ERR(pclk);
 728         }
 729         retval = clk_prepare_enable(pclk);
 730         if (retval)
 731                 goto err_prepare_enable;
 732
 733         retval = snd_card_new(&pdev->dev, SNDRV_DEFAULT_IDX1,
 734                               SNDRV_DEFAULT_STR1, THIS_MODULE,
 735                               sizeof(struct atmel_ac97c), &card);
 736         if (retval) {
 737                 dev_dbg(&pdev->dev, "could not create sound card device\n");
 738                 goto err_snd_card_new;
 739         }
 740
 741         chip = get_chip(card);
 742
 743         retval = request_irq(irq, atmel_ac97c_interrupt, 0, "AC97C", chip);
 744         if (retval) {
 745                 dev_dbg(&pdev->dev, "unable to request irq %d\n", irq);
 746                 goto err_request_irq;
 747         }
 748         chip->irq = irq;
 749
 750         spin_lock_init(&chip->lock);
 751
 752         strcpy(card->driver, "Atmel AC97C");
 753         strcpy(card->shortname, "Atmel AC97C");
 754         sprintf(card->longname, "Atmel AC97 controller");
 755
 756         chip->card = card;
 757         chip->pclk = pclk;
 758         chip->pdev = pdev;
 759         chip->regs = ioremap(regs->start, resource_size(regs));
 760
 761         if (!chip->regs) {
 762                 dev_dbg(&pdev->dev, "could not remap register memory\n");
 763                 retval = -ENOMEM;
 764                 goto err_ioremap;
 765         }
 766
 767         chip->reset_pin = devm_gpiod_get_index(dev, "ac97", 2, GPIOD_OUT_HIGH);
 768         if (IS_ERR(chip->reset_pin))
 769                 dev_dbg(dev, "reset pin not available\n");
 770
 771         atmel_ac97c_reset(chip);
 772
 773         /* Enable overrun interrupt from codec channel */
 774         ac97c_writel(chip, COMR, AC97C_CSR_OVRUN);
 775         ac97c_writel(chip, IER, ac97c_readl(chip, IMR) | AC97C_SR_COEVT);
 776
 777         retval = snd_ac97_bus(card, 0, &ops, chip, &chip->ac97_bus);
 778         if (retval) {
 779                 dev_dbg(&pdev->dev, "could not register on ac97 bus\n");
 780                 goto err_ac97_bus;
 781         }
 782
 783         retval = atmel_ac97c_mixer_new(chip);
 784         if (retval) {
 785                 dev_dbg(&pdev->dev, "could not register ac97 mixer\n");
 786                 goto err_ac97_bus;
 787         }
 788
 789         retval = atmel_ac97c_pcm_new(chip);
 790         if (retval) {
 791                 dev_dbg(&pdev->dev, "could not register ac97 pcm device\n");
 792                 goto err_ac97_bus;
 793         }
 794
 795         retval = snd_card_register(card);
 796         if (retval) {
 797                 dev_dbg(&pdev->dev, "could not register sound card\n");
 798                 goto err_ac97_bus;
 799         }
 800
 801         platform_set_drvdata(pdev, card);
 802
 803         dev_info(&pdev->dev, "Atmel AC97 controller at 0x%p, irq = %d\n",
 804                         chip->regs, irq);
 805
 806         return 0;
 807
 808 err_ac97_bus:
 809         iounmap(chip->regs);
 810 err_ioremap:
 811         free_irq(irq, chip);
 812 err_request_irq:
 813         snd_card_free(card);
 814 err_snd_card_new:
 815         clk_disable_unprepare(pclk);
 816 err_prepare_enable:
 817         clk_put(pclk);
 818         return retval;
 819 }
 820
 821 #ifdef CONFIG_PM_SLEEP
 822 static int atmel_ac97c_suspend(struct device *pdev)
 823 {
 824         struct snd_card *card = dev_get_drvdata(pdev);
 825         struct atmel_ac97c *chip = card->private_data;
 826
 827         clk_disable_unprepare(chip->pclk);
 828         return 0;
 829 }
 830
 831 static int atmel_ac97c_resume(struct device *pdev)
 832 {
 833         struct snd_card *card = dev_get_drvdata(pdev);
 834         struct atmel_ac97c *chip = card->private_data;
 835         int ret = clk_prepare_enable(chip->pclk);
 836
 837         return ret;
 838 }
 839
 840 static SIMPLE_DEV_PM_OPS(atmel_ac97c_pm, atmel_ac97c_suspend, atmel_ac97c_resume);
 841 #define ATMEL_AC97C_PM_OPS      &atmel_ac97c_pm
 842 #else
 843 #define ATMEL_AC97C_PM_OPS      NULL
 844 #endif
 845
 846 static int atmel_ac97c_remove(struct platform_device *pdev)
 847 {
 848         struct snd_card *card = platform_get_drvdata(pdev);
 849         struct atmel_ac97c *chip = get_chip(card);
 850
 851         ac97c_writel(chip, CAMR, 0);
 852         ac97c_writel(chip, COMR, 0);
 853         ac97c_writel(chip, MR,   0);
 854
 855         clk_disable_unprepare(chip->pclk);
 856         clk_put(chip->pclk);
 857         iounmap(chip->regs);
 858         free_irq(chip->irq, chip);
 859
 860         snd_card_free(card);
 861
 862         return 0;
 863 }
 864
 865 static struct platform_driver atmel_ac97c_driver = {
 866         .probe          = atmel_ac97c_probe,
 867         .remove         = atmel_ac97c_remove,
 868         .driver         = {
 869                 .name   = "atmel_ac97c",
 870                 .pm     = ATMEL_AC97C_PM_OPS,
 871                 .of_match_table = atmel_ac97c_dt_ids,
 872         },
 873 };
 874 module_platform_driver(atmel_ac97c_driver);
 875
 876 MODULE_LICENSE("GPL");
 877 MODULE_DESCRIPTION("Driver for Atmel AC97 controller");
 878 MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");