sound/mips/au1x00.c

   1 /*
   2  * BRIEF MODULE DESCRIPTION
   3  *  Driver for AMD Au1000 MIPS Processor, AC'97 Sound Port
   4  *
   5  * Copyright 2004 Cooper Street Innovations Inc.
   6  * Author: Charles Eidsness     <charles@cooper-street.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  14  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  15  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  16  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  17  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  18  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  19  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  20  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  21  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  22  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  23  *
  24  *  You should have received a copy of the  GNU General Public License along
  25  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  26  *  675 Mass Ave, Cambridge, MA 02139, USA.
  27  *
  28  * History:
  29  *
  30  * 2004-09-09 Charles Eidsness  -- Original verion -- based on
  31  *                                sa11xx-uda1341.c ALSA driver and the
  32  *                                au1000.c OSS driver.
  33  * 2004-09-09 Matt Porter       -- Added support for ALSA 1.0.6
  34  *
  35  */
  36
  37 #include <linux/ioport.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/init.h>
  40 #include <linux/slab.h>
  41 #include <linux/module.h>
  42 #include <sound/core.h>
  43 #include <sound/initval.h>
  44 #include <sound/pcm.h>
  45 #include <sound/pcm_params.h>
  46 #include <sound/ac97_codec.h>
  47 #include <asm/mach-au1x00/au1000.h>
  48 #include <asm/mach-au1x00/au1000_dma.h>
  49
  50 MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
  51 MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
  52 MODULE_LICENSE("GPL");
  53 MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
  54
  55 #define PLAYBACK 0
  56 #define CAPTURE 1
  57 #define AC97_SLOT_3 0x01
  58 #define AC97_SLOT_4 0x02
  59 #define AC97_SLOT_6 0x08
  60 #define AC97_CMD_IRQ 31
  61 #define READ 0
  62 #define WRITE 1
  63 #define READ_WAIT 2
  64 #define RW_DONE 3
  65
  66 struct au1000_period
  67 {
  68         u32 start;
  69         u32 relative_end;       /*realtive to start of buffer*/
  70         struct au1000_period * next;
  71 };
  72
  73 /*Au1000 AC97 Port Control Reisters*/
  74 struct au1000_ac97_reg {
  75         u32 volatile config;
  76         u32 volatile status;
  77         u32 volatile data;
  78         u32 volatile cmd;
  79         u32 volatile cntrl;
  80 };
  81
  82 struct audio_stream {
  83         struct snd_pcm_substream *substream;
  84         int dma;
  85         spinlock_t dma_lock;
  86         struct au1000_period * buffer;
  87         unsigned int period_size;
  88         unsigned int periods;
  89 };
  90
  91 struct snd_au1000 {
  92         struct snd_card *card;
  93         struct au1000_ac97_reg volatile *ac97_ioport;
  94
  95         struct resource *ac97_res_port;
  96         spinlock_t ac97_lock;
  97         struct snd_ac97 *ac97;
  98
  99         struct snd_pcm *pcm;
 100         struct audio_stream *stream[2]; /* playback & capture */
 101 };
 102
 103 /*--------------------------- Local Functions --------------------------------*/
 104 static void
 105 au1000_set_ac97_xmit_slots(struct snd_au1000 *au1000, long xmit_slots)
 106 {
 107         u32 volatile ac97_config;
 108
 109         spin_lock(&au1000->ac97_lock);
 110         ac97_config = au1000->ac97_ioport->config;
 111         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
 112         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
 113         au1000->ac97_ioport->config = ac97_config;
 114         spin_unlock(&au1000->ac97_lock);
 115 }
 116
 117 static void
 118 au1000_set_ac97_recv_slots(struct snd_au1000 *au1000, long recv_slots)
 119 {
 120         u32 volatile ac97_config;
 121
 122         spin_lock(&au1000->ac97_lock);
 123         ac97_config = au1000->ac97_ioport->config;
 124         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
 125         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
 126         au1000->ac97_ioport->config = ac97_config;
 127         spin_unlock(&au1000->ac97_lock);
 128 }
 129
 130
 131 static void
 132 au1000_release_dma_link(struct audio_stream *stream)
 133 {
 134         struct au1000_period * pointer;
 135         struct au1000_period * pointer_next;
 136
 137         stream->period_size = 0;
 138         stream->periods = 0;
 139         pointer = stream->buffer;
 140         if (! pointer)
 141                 return;
 142         do {
 143                 pointer_next = pointer->next;
 144                 kfree(pointer);
 145                 pointer = pointer_next;
 146         } while (pointer != stream->buffer);
 147         stream->buffer = NULL;
 148 }
 149
 150 static int
 151 au1000_setup_dma_link(struct audio_stream *stream, unsigned int period_bytes,
 152                       unsigned int periods)
 153 {
 154         struct snd_pcm_substream *substream = stream->substream;
 155         struct snd_pcm_runtime *runtime = substream->runtime;
 156         struct au1000_period *pointer;
 157         unsigned long dma_start;
 158         int i;
 159
 160         dma_start = virt_to_phys(runtime->dma_area);
 161
 162         if (stream->period_size == period_bytes &&
 163             stream->periods == periods)
 164                 return 0; /* not changed */
 165
 166         au1000_release_dma_link(stream);
 167
 168         stream->period_size = period_bytes;
 169         stream->periods = periods;
 170
 171         stream->buffer = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
 172         if (! stream->buffer)
 173                 return -ENOMEM;
 174         pointer = stream->buffer;
 175         for (i = 0; i < periods; i++) {
 176                 pointer->start = (u32)(dma_start + (i * period_bytes));
 177                 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
 178                 if (i < periods - 1) {
 179                         pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
 180                         if (! pointer->next) {
 181                                 au1000_release_dma_link(stream);
 182                                 return -ENOMEM;
 183                         }
 184                         pointer = pointer->next;
 185                 }
 186         }
 187         pointer->next = stream->buffer;
 188         return 0;
 189 }
 190
 191 static void
 192 au1000_dma_stop(struct audio_stream *stream)
 193 {
 194         if (snd_BUG_ON(!stream->buffer))
 195                 return;
 196         disable_dma(stream->dma);
 197 }
 198
 199 static void
 200 au1000_dma_start(struct audio_stream *stream)
 201 {
 202         if (snd_BUG_ON(!stream->buffer))
 203                 return;
 204
 205         init_dma(stream->dma);
 206         if (get_dma_active_buffer(stream->dma) == 0) {
 207                 clear_dma_done0(stream->dma);
 208                 set_dma_addr0(stream->dma, stream->buffer->start);
 209                 set_dma_count0(stream->dma, stream->period_size >> 1);
 210                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 211                 set_dma_count1(stream->dma, stream->period_size >> 1);
 212         } else {
 213                 clear_dma_done1(stream->dma);
 214                 set_dma_addr1(stream->dma, stream->buffer->start);
 215                 set_dma_count1(stream->dma, stream->period_size >> 1);
 216                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 217                 set_dma_count0(stream->dma, stream->period_size >> 1);
 218         }
 219         enable_dma_buffers(stream->dma);
 220         start_dma(stream->dma);
 221 }
 222
 223 static irqreturn_t
 224 au1000_dma_interrupt(int irq, void *dev_id)
 225 {
 226         struct audio_stream *stream = (struct audio_stream *) dev_id;
 227         struct snd_pcm_substream *substream = stream->substream;
 228
 229         spin_lock(&stream->dma_lock);
 230         switch (get_dma_buffer_done(stream->dma)) {
 231         case DMA_D0:
 232                 stream->buffer = stream->buffer->next;
 233                 clear_dma_done0(stream->dma);
 234                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 235                 set_dma_count0(stream->dma, stream->period_size >> 1);
 236                 enable_dma_buffer0(stream->dma);
 237                 break;
 238         case DMA_D1:
 239                 stream->buffer = stream->buffer->next;
 240                 clear_dma_done1(stream->dma);
 241                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 242                 set_dma_count1(stream->dma, stream->period_size >> 1);
 243                 enable_dma_buffer1(stream->dma);
 244                 break;
 245         case (DMA_D0 | DMA_D1):
 246                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
 247                 au1000_dma_stop(stream);
 248                 au1000_dma_start(stream);
 249                 break;
 250         case (~DMA_D0 & ~DMA_D1):
 251                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
 252         }
 253         spin_unlock(&stream->dma_lock);
 254         snd_pcm_period_elapsed(substream);
 255         return IRQ_HANDLED;
 256 }
 257
 258 /*-------------------------- PCM Audio Streams -------------------------------*/
 259
 260 static unsigned int rates[] = {8000, 11025, 16000, 22050};
 261 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
 262         .count  = ARRAY_SIZE(rates),
 263         .list   = rates,
 264         .mask   = 0,
 265 };
 266
 267 static struct snd_pcm_hardware snd_au1000_hw =
 268 {
 269         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
 270                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
 271         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 272         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
 273                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
 274         .rate_min               = 8000,
 275         .rate_max               = 22050,
 276         .channels_min           = 1,
 277         .channels_max           = 2,
 278         .buffer_bytes_max       = 128*1024,
 279         .period_bytes_min       = 32,
 280         .period_bytes_max       = 16*1024,
 281         .periods_min            = 8,
 282         .periods_max            = 255,
 283         .fifo_size              = 16,
 284 };
 285
 286 static int
 287 snd_au1000_playback_open(struct snd_pcm_substream *substream)
 288 {
 289         struct snd_au1000 *au1000 = substream->pcm->private_data;
 290
 291         au1000->stream[PLAYBACK]->substream = substream;
 292         au1000->stream[PLAYBACK]->buffer = NULL;
 293         substream->private_data = au1000->stream[PLAYBACK];
 294         substream->runtime->hw = snd_au1000_hw;
 295         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 296                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 297 }
 298
 299 static int
 300 snd_au1000_capture_open(struct snd_pcm_substream *substream)
 301 {
 302         struct snd_au1000 *au1000 = substream->pcm->private_data;
 303
 304         au1000->stream[CAPTURE]->substream = substream;
 305         au1000->stream[CAPTURE]->buffer = NULL;
 306         substream->private_data = au1000->stream[CAPTURE];
 307         substream->runtime->hw = snd_au1000_hw;
 308         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 309                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 310 }
 311
 312 static int
 313 snd_au1000_playback_close(struct snd_pcm_substream *substream)
 314 {
 315         struct snd_au1000 *au1000 = substream->pcm->private_data;
 316
 317         au1000->stream[PLAYBACK]->substream = NULL;
 318         return 0;
 319 }
 320
 321 static int
 322 snd_au1000_capture_close(struct snd_pcm_substream *substream)
 323 {
 324         struct snd_au1000 *au1000 = substream->pcm->private_data;
 325
 326         au1000->stream[CAPTURE]->substream = NULL;
 327         return 0;
 328 }
 329
 330 static int
 331 snd_au1000_hw_params(struct snd_pcm_substream *substream,
 332                                         struct snd_pcm_hw_params *hw_params)
 333 {
 334         struct audio_stream *stream = substream->private_data;
 335         int err;
 336
 337         err = snd_pcm_lib_malloc_pages(substream,
 338                                        params_buffer_bytes(hw_params));
 339         if (err < 0)
 340                 return err;
 341         return au1000_setup_dma_link(stream,
 342                                      params_period_bytes(hw_params),
 343                                      params_periods(hw_params));
 344 }
 345
 346 static int
 347 snd_au1000_hw_free(struct snd_pcm_substream *substream)
 348 {
 349         struct audio_stream *stream = substream->private_data;
 350         au1000_release_dma_link(stream);
 351         return snd_pcm_lib_free_pages(substream);
 352 }
 353
 354 static int
 355 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
 356 {
 357         struct snd_au1000 *au1000 = substream->pcm->private_data;
 358         struct snd_pcm_runtime *runtime = substream->runtime;
 359
 360         if (runtime->channels == 1)
 361                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
 362         else
 363                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 364         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 365         return 0;
 366 }
 367
 368 static int
 369 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
 370 {
 371         struct snd_au1000 *au1000 = substream->pcm->private_data;
 372         struct snd_pcm_runtime *runtime = substream->runtime;
 373
 374         if (runtime->channels == 1)
 375                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
 376         else
 377                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 378         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 379         return 0;
 380 }
 381
 382 static int
 383 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
 384 {
 385         struct audio_stream *stream = substream->private_data;
 386         int err = 0;
 387
 388         spin_lock(&stream->dma_lock);
 389         switch (cmd) {
 390         case SNDRV_PCM_TRIGGER_START:
 391                 au1000_dma_start(stream);
 392                 break;
 393         case SNDRV_PCM_TRIGGER_STOP:
 394                 au1000_dma_stop(stream);
 395                 break;
 396         default:
 397                 err = -EINVAL;
 398                 break;
 399         }
 400         spin_unlock(&stream->dma_lock);
 401         return err;
 402 }
 403
 404 static snd_pcm_uframes_t
 405 snd_au1000_pointer(struct snd_pcm_substream *substream)
 406 {
 407         struct audio_stream *stream = substream->private_data;
 408         struct snd_pcm_runtime *runtime = substream->runtime;
 409         long location;
 410
 411         spin_lock(&stream->dma_lock);
 412         location = get_dma_residue(stream->dma);
 413         spin_unlock(&stream->dma_lock);
 414         location = stream->buffer->relative_end - location;
 415         if (location == -1)
 416                 location = 0;
 417         return bytes_to_frames(runtime,location);
 418 }
 419
 420 static struct snd_pcm_ops snd_card_au1000_playback_ops = {
 421         .open                   = snd_au1000_playback_open,
 422         .close                  = snd_au1000_playback_close,
 423         .ioctl                  = snd_pcm_lib_ioctl,
 424         .hw_params              = snd_au1000_hw_params,
 425         .hw_free                = snd_au1000_hw_free,
 426         .prepare                = snd_au1000_playback_prepare,
 427         .trigger                = snd_au1000_trigger,
 428         .pointer                = snd_au1000_pointer,
 429 };
 430
 431 static struct snd_pcm_ops snd_card_au1000_capture_ops = {
 432         .open                   = snd_au1000_capture_open,
 433         .close                  = snd_au1000_capture_close,
 434         .ioctl                  = snd_pcm_lib_ioctl,
 435         .hw_params              = snd_au1000_hw_params,
 436         .hw_free                = snd_au1000_hw_free,
 437         .prepare                = snd_au1000_capture_prepare,
 438         .trigger                = snd_au1000_trigger,
 439         .pointer                = snd_au1000_pointer,
 440 };
 441
 442 static int __devinit
 443 snd_au1000_pcm_new(struct snd_au1000 *au1000)
 444 {
 445         struct snd_pcm *pcm;
 446         int err;
 447         unsigned long flags;
 448
 449         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
 450                 return err;
 451
 452         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 453                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
 454
 455         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 456                 &snd_card_au1000_playback_ops);
 457         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 458                 &snd_card_au1000_capture_ops);
 459
 460         pcm->private_data = au1000;
 461         pcm->info_flags = 0;
 462         strcpy(pcm->name, "Au1000 AC97 PCM");
 463
 464         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
 465         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 466
 467         flags = claim_dma_lock();
 468         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 469                         "AC97 TX", au1000_dma_interrupt, 0,
 470                         au1000->stream[PLAYBACK])) < 0) {
 471                 release_dma_lock(flags);
 472                 return -EBUSY;
 473         }
 474         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
 475                         "AC97 RX", au1000_dma_interrupt, 0,
 476                         au1000->stream[CAPTURE])) < 0){
 477                 release_dma_lock(flags);
 478                 return -EBUSY;
 479         }
 480         /* enable DMA coherency in read/write DMA channels */
 481         set_dma_mode(au1000->stream[PLAYBACK]->dma,
 482                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
 483         set_dma_mode(au1000->stream[CAPTURE]->dma,
 484                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 485         release_dma_lock(flags);
 486         au1000->pcm = pcm;
 487         return 0;
 488 }
 489
 490
 491 /*-------------------------- AC97 CODEC Control ------------------------------*/
 492
 493 static unsigned short
 494 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 495 {
 496         struct snd_au1000 *au1000 = ac97->private_data;
 497         u32 volatile cmd;
 498         u16 volatile data;
 499         int             i;
 500
 501         spin_lock(&au1000->ac97_lock);
 502 /* would rather use the interrupt than this polling but it works and I can't
 503 get the interrupt driven case to work efficiently */
 504         for (i = 0; i < 0x5000; i++)
 505                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 506                         break;
 507         if (i == 0x5000)
 508                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 509
 510         cmd = (u32) reg & AC97C_INDEX_MASK;
 511         cmd |= AC97C_READ;
 512         au1000->ac97_ioport->cmd = cmd;
 513
 514         /* now wait for the data */
 515         for (i = 0; i < 0x5000; i++)
 516                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 517                         break;
 518         if (i == 0x5000) {
 519                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 520                 spin_unlock(&au1000->ac97_lock);
 521                 return 0;
 522         }
 523
 524         data = au1000->ac97_ioport->cmd & 0xffff;
 525         spin_unlock(&au1000->ac97_lock);
 526
 527         return data;
 528
 529 }
 530
 531
 532 static void
 533 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
 534 {
 535         struct snd_au1000 *au1000 = ac97->private_data;
 536         u32 cmd;
 537         int i;
 538
 539         spin_lock(&au1000->ac97_lock);
 540 /* would rather use the interrupt than this polling but it works and I can't
 541 get the interrupt driven case to work efficiently */
 542         for (i = 0; i < 0x5000; i++)
 543                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 544                         break;
 545         if (i == 0x5000)
 546                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
 547
 548         cmd = (u32) reg & AC97C_INDEX_MASK;
 549         cmd &= ~AC97C_READ;
 550         cmd |= ((u32) val << AC97C_WD_BIT);
 551         au1000->ac97_ioport->cmd = cmd;
 552         spin_unlock(&au1000->ac97_lock);
 553 }
 554
 555 static int __devinit
 556 snd_au1000_ac97_new(struct snd_au1000 *au1000)
 557 {
 558         int err;
 559         struct snd_ac97_bus *pbus;
 560         struct snd_ac97_template ac97;
 561         static struct snd_ac97_bus_ops ops = {
 562                 .write = snd_au1000_ac97_write,
 563                 .read = snd_au1000_ac97_read,
 564         };
 565
 566         if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
 567                         0x100000, "Au1x00 AC97")) == NULL) {
 568                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
 569                 return -EBUSY;
 570         }
 571         au1000->ac97_ioport = (struct au1000_ac97_reg *)
 572                 KSEG1ADDR(au1000->ac97_res_port->start);
 573
 574         spin_lock_init(&au1000->ac97_lock);
 575
 576         /* configure pins for AC'97
 577         TODO: move to board_setup.c */
 578         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
 579
 580         /* Initialise Au1000's AC'97 Control Block */
 581         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
 582         udelay(10);
 583         au1000->ac97_ioport->cntrl = AC97C_CE;
 584         udelay(10);
 585
 586         /* Initialise External CODEC -- cold reset */
 587         au1000->ac97_ioport->config = AC97C_RESET;
 588         udelay(10);
 589         au1000->ac97_ioport->config = 0x0;
 590         mdelay(5);
 591
 592         /* Initialise AC97 middle-layer */
 593         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 594                 return err;
 595
 596         memset(&ac97, 0, sizeof(ac97));
 597         ac97.private_data = au1000;
 598         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 599                 return err;
 600
 601         return 0;
 602 }
 603
 604 /*------------------------------ Setup / Destroy ----------------------------*/
 605
 606 void
 607 snd_au1000_free(struct snd_card *card)
 608 {
 609         struct snd_au1000 *au1000 = card->private_data;
 610
 611         if (au1000->ac97_res_port) {
 612                 /* put internal AC97 block into reset */
 613                 au1000->ac97_ioport->cntrl = AC97C_RS;
 614                 au1000->ac97_ioport = NULL;
 615                 release_and_free_resource(au1000->ac97_res_port);
 616         }
 617
 618         if (au1000->stream[PLAYBACK]) {
 619                 if (au1000->stream[PLAYBACK]->dma >= 0)
 620                         free_au1000_dma(au1000->stream[PLAYBACK]->dma);
 621                 kfree(au1000->stream[PLAYBACK]);
 622         }
 623
 624         if (au1000->stream[CAPTURE]) {
 625                 if (au1000->stream[CAPTURE]->dma >= 0)
 626                         free_au1000_dma(au1000->stream[CAPTURE]->dma);
 627                 kfree(au1000->stream[CAPTURE]);
 628         }
 629 }
 630
 631
 632 static struct snd_card *au1000_card;
 633
 634 static int __init
 635 au1000_init(void)
 636 {
 637         int err;
 638         struct snd_card *card;
 639         struct snd_au1000 *au1000;
 640
 641         err = snd_card_create(-1, "AC97", THIS_MODULE,
 642                               sizeof(struct snd_au1000), &card);
 643         if (err < 0)
 644                 return err;
 645
 646         card->private_free = snd_au1000_free;
 647         au1000 = card->private_data;
 648         au1000->card = card;
 649
 650         au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 651         au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 652         /* so that snd_au1000_free will work as intended */
 653         au1000->ac97_res_port = NULL;
 654         if (au1000->stream[PLAYBACK])
 655                 au1000->stream[PLAYBACK]->dma = -1;
 656         if (au1000->stream[CAPTURE ])
 657                 au1000->stream[CAPTURE ]->dma = -1;
 658
 659         if (au1000->stream[PLAYBACK] == NULL ||
 660             au1000->stream[CAPTURE ] == NULL) {
 661                 snd_card_free(card);
 662                 return -ENOMEM;
 663         }
 664
 665         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
 666                 snd_card_free(card);
 667                 return err;
 668         }
 669
 670         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
 671                 snd_card_free(card);
 672                 return err;
 673         }
 674
 675         strcpy(card->driver, "Au1000-AC97");
 676         strcpy(card->shortname, "AMD Au1000-AC97");
 677         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
 678
 679         if ((err = snd_card_register(card)) < 0) {
 680                 snd_card_free(card);
 681                 return err;
 682         }
 683
 684         printk(KERN_INFO "ALSA AC97: Driver Initialized\n");
 685         au1000_card = card;
 686         return 0;
 687 }
 688
 689 static void __exit au1000_exit(void)
 690 {
 691         snd_card_free(au1000_card);
 692 }
 693
 694 module_init(au1000_init);
 695 module_exit(au1000_exit);
 696