git.oblomov.eu Git - linux-2.6/blob - 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 <sound/core.h>
  42 #include <sound/initval.h>
  43 #include <sound/pcm.h>
  44 #include <sound/pcm_params.h>
  45 #include <sound/ac97_codec.h>
  46 #include <asm/mach-au1x00/au1000.h>
  47 #include <asm/mach-au1x00/au1000_dma.h>
  48
  49 MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
  50 MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
  51 MODULE_LICENSE("GPL");
  52 MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
  53
  54 #define PLAYBACK 0
  55 #define CAPTURE 1
  56 #define AC97_SLOT_3 0x01
  57 #define AC97_SLOT_4 0x02
  58 #define AC97_SLOT_6 0x08
  59 #define AC97_CMD_IRQ 31
  60 #define READ 0
  61 #define WRITE 1
  62 #define READ_WAIT 2
  63 #define RW_DONE 3
  64
  65 struct au1000_period
  66 {
  67         u32 start;
  68         u32 relative_end;       /*realtive to start of buffer*/
  69         struct au1000_period * next;
  70 };
  71
  72 /*Au1000 AC97 Port Control Reisters*/
  73 struct au1000_ac97_reg {
  74         u32 volatile config;
  75         u32 volatile status;
  76         u32 volatile data;
  77         u32 volatile cmd;
  78         u32 volatile cntrl;
  79 };
  80
  81 struct audio_stream {
  82         struct snd_pcm_substream *substream;
  83         int dma;
  84         spinlock_t dma_lock;
  85         struct au1000_period * buffer;
  86         unsigned int period_size;
  87         unsigned int periods;
  88 };
  89
  90 struct snd_au1000 {
  91         struct snd_card *card;
  92         struct au1000_ac97_reg volatile *ac97_ioport;
  93
  94         struct resource *ac97_res_port;
  95         spinlock_t ac97_lock;
  96         struct snd_ac97 *ac97;
  97
  98         struct snd_pcm *pcm;
  99         struct audio_stream *stream[2]; /* playback & capture */
 100 };
 101
 102 /*--------------------------- Local Functions --------------------------------*/
 103 static void
 104 au1000_set_ac97_xmit_slots(struct snd_au1000 *au1000, long xmit_slots)
 105 {
 106         u32 volatile ac97_config;
 107
 108         spin_lock(&au1000->ac97_lock);
 109         ac97_config = au1000->ac97_ioport->config;
 110         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
 111         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
 112         au1000->ac97_ioport->config = ac97_config;
 113         spin_unlock(&au1000->ac97_lock);
 114 }
 115
 116 static void
 117 au1000_set_ac97_recv_slots(struct snd_au1000 *au1000, long recv_slots)
 118 {
 119         u32 volatile ac97_config;
 120
 121         spin_lock(&au1000->ac97_lock);
 122         ac97_config = au1000->ac97_ioport->config;
 123         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
 124         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
 125         au1000->ac97_ioport->config = ac97_config;
 126         spin_unlock(&au1000->ac97_lock);
 127 }
 128
 129
 130 static void
 131 au1000_release_dma_link(struct audio_stream *stream)
 132 {
 133         struct au1000_period * pointer;
 134         struct au1000_period * pointer_next;
 135
 136         stream->period_size = 0;
 137         stream->periods = 0;
 138         pointer = stream->buffer;
 139         if (! pointer)
 140                 return;
 141         do {
 142                 pointer_next = pointer->next;
 143                 kfree(pointer);
 144                 pointer = pointer_next;
 145         } while (pointer != stream->buffer);
 146         stream->buffer = NULL;
 147 }
 148
 149 static int
 150 au1000_setup_dma_link(struct audio_stream *stream, unsigned int period_bytes,
 151                       unsigned int periods)
 152 {
 153         struct snd_pcm_substream *substream = stream->substream;
 154         struct snd_pcm_runtime *runtime = substream->runtime;
 155         struct au1000_period *pointer;
 156         unsigned long dma_start;
 157         int i;
 158
 159         dma_start = virt_to_phys(runtime->dma_area);
 160
 161         if (stream->period_size == period_bytes &&
 162             stream->periods == periods)
 163                 return 0; /* not changed */
 164
 165         au1000_release_dma_link(stream);
 166
 167         stream->period_size = period_bytes;
 168         stream->periods = periods;
 169
 170         stream->buffer = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
 171         if (! stream->buffer)
 172                 return -ENOMEM;
 173         pointer = stream->buffer;
 174         for (i = 0; i < periods; i++) {
 175                 pointer->start = (u32)(dma_start + (i * period_bytes));
 176                 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
 177                 if (i < periods - 1) {
 178                         pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
 179                         if (! pointer->next) {
 180                                 au1000_release_dma_link(stream);
 181                                 return -ENOMEM;
 182                         }
 183                         pointer = pointer->next;
 184                 }
 185         }
 186         pointer->next = stream->buffer;
 187         return 0;
 188 }
 189
 190 static void
 191 au1000_dma_stop(struct audio_stream *stream)
 192 {
 193         if (snd_BUG_ON(!stream->buffer))
 194                 return;
 195         disable_dma(stream->dma);
 196 }
 197
 198 static void
 199 au1000_dma_start(struct audio_stream *stream)
 200 {
 201         if (snd_BUG_ON(!stream->buffer))
 202                 return;
 203
 204         init_dma(stream->dma);
 205         if (get_dma_active_buffer(stream->dma) == 0) {
 206                 clear_dma_done0(stream->dma);
 207                 set_dma_addr0(stream->dma, stream->buffer->start);
 208                 set_dma_count0(stream->dma, stream->period_size >> 1);
 209                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 210                 set_dma_count1(stream->dma, stream->period_size >> 1);
 211         } else {
 212                 clear_dma_done1(stream->dma);
 213                 set_dma_addr1(stream->dma, stream->buffer->start);
 214                 set_dma_count1(stream->dma, stream->period_size >> 1);
 215                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 216                 set_dma_count0(stream->dma, stream->period_size >> 1);
 217         }
 218         enable_dma_buffers(stream->dma);
 219         start_dma(stream->dma);
 220 }
 221
 222 static irqreturn_t
 223 au1000_dma_interrupt(int irq, void *dev_id)
 224 {
 225         struct audio_stream *stream = (struct audio_stream *) dev_id;
 226         struct snd_pcm_substream *substream = stream->substream;
 227
 228         spin_lock(&stream->dma_lock);
 229         switch (get_dma_buffer_done(stream->dma)) {
 230         case DMA_D0:
 231                 stream->buffer = stream->buffer->next;
 232                 clear_dma_done0(stream->dma);
 233                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 234                 set_dma_count0(stream->dma, stream->period_size >> 1);
 235                 enable_dma_buffer0(stream->dma);
 236                 break;
 237         case DMA_D1:
 238                 stream->buffer = stream->buffer->next;
 239                 clear_dma_done1(stream->dma);
 240                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 241                 set_dma_count1(stream->dma, stream->period_size >> 1);
 242                 enable_dma_buffer1(stream->dma);
 243                 break;
 244         case (DMA_D0 | DMA_D1):
 245                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
 246                 au1000_dma_stop(stream);
 247                 au1000_dma_start(stream);
 248                 break;
 249         case (~DMA_D0 & ~DMA_D1):
 250                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
 251         }
 252         spin_unlock(&stream->dma_lock);
 253         snd_pcm_period_elapsed(substream);
 254         return IRQ_HANDLED;
 255 }
 256
 257 /*-------------------------- PCM Audio Streams -------------------------------*/
 258
 259 static unsigned int rates[] = {8000, 11025, 16000, 22050};
 260 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
 261         .count  = ARRAY_SIZE(rates),
 262         .list   = rates,
 263         .mask   = 0,
 264 };
 265
 266 static struct snd_pcm_hardware snd_au1000_hw =
 267 {
 268         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
 269                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
 270         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 271         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
 272                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
 273         .rate_min               = 8000,
 274         .rate_max               = 22050,
 275         .channels_min           = 1,
 276         .channels_max           = 2,
 277         .buffer_bytes_max       = 128*1024,
 278         .period_bytes_min       = 32,
 279         .period_bytes_max       = 16*1024,
 280         .periods_min            = 8,
 281         .periods_max            = 255,
 282         .fifo_size              = 16,
 283 };
 284
 285 static int
 286 snd_au1000_playback_open(struct snd_pcm_substream *substream)
 287 {
 288         struct snd_au1000 *au1000 = substream->pcm->private_data;
 289
 290         au1000->stream[PLAYBACK]->substream = substream;
 291         au1000->stream[PLAYBACK]->buffer = NULL;
 292         substream->private_data = au1000->stream[PLAYBACK];
 293         substream->runtime->hw = snd_au1000_hw;
 294         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 295                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 296 }
 297
 298 static int
 299 snd_au1000_capture_open(struct snd_pcm_substream *substream)
 300 {
 301         struct snd_au1000 *au1000 = substream->pcm->private_data;
 302
 303         au1000->stream[CAPTURE]->substream = substream;
 304         au1000->stream[CAPTURE]->buffer = NULL;
 305         substream->private_data = au1000->stream[CAPTURE];
 306         substream->runtime->hw = snd_au1000_hw;
 307         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 308                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 309 }
 310
 311 static int
 312 snd_au1000_playback_close(struct snd_pcm_substream *substream)
 313 {
 314         struct snd_au1000 *au1000 = substream->pcm->private_data;
 315
 316         au1000->stream[PLAYBACK]->substream = NULL;
 317         return 0;
 318 }
 319
 320 static int
 321 snd_au1000_capture_close(struct snd_pcm_substream *substream)
 322 {
 323         struct snd_au1000 *au1000 = substream->pcm->private_data;
 324
 325         au1000->stream[CAPTURE]->substream = NULL;
 326         return 0;
 327 }
 328
 329 static int
 330 snd_au1000_hw_params(struct snd_pcm_substream *substream,
 331                                         struct snd_pcm_hw_params *hw_params)
 332 {
 333         struct audio_stream *stream = substream->private_data;
 334         int err;
 335
 336         err = snd_pcm_lib_malloc_pages(substream,
 337                                        params_buffer_bytes(hw_params));
 338         if (err < 0)
 339                 return err;
 340         return au1000_setup_dma_link(stream,
 341                                      params_period_bytes(hw_params),
 342                                      params_periods(hw_params));
 343 }
 344
 345 static int
 346 snd_au1000_hw_free(struct snd_pcm_substream *substream)
 347 {
 348         struct audio_stream *stream = substream->private_data;
 349         au1000_release_dma_link(stream);
 350         return snd_pcm_lib_free_pages(substream);
 351 }
 352
 353 static int
 354 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
 355 {
 356         struct snd_au1000 *au1000 = substream->pcm->private_data;
 357         struct snd_pcm_runtime *runtime = substream->runtime;
 358
 359         if (runtime->channels == 1)
 360                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
 361         else
 362                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 363         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 364         return 0;
 365 }
 366
 367 static int
 368 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
 369 {
 370         struct snd_au1000 *au1000 = substream->pcm->private_data;
 371         struct snd_pcm_runtime *runtime = substream->runtime;
 372
 373         if (runtime->channels == 1)
 374                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
 375         else
 376                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 377         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 378         return 0;
 379 }
 380
 381 static int
 382 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
 383 {
 384         struct audio_stream *stream = substream->private_data;
 385         int err = 0;
 386
 387         spin_lock(&stream->dma_lock);
 388         switch (cmd) {
 389         case SNDRV_PCM_TRIGGER_START:
 390                 au1000_dma_start(stream);
 391                 break;
 392         case SNDRV_PCM_TRIGGER_STOP:
 393                 au1000_dma_stop(stream);
 394                 break;
 395         default:
 396                 err = -EINVAL;
 397                 break;
 398         }
 399         spin_unlock(&stream->dma_lock);
 400         return err;
 401 }
 402
 403 static snd_pcm_uframes_t
 404 snd_au1000_pointer(struct snd_pcm_substream *substream)
 405 {
 406         struct audio_stream *stream = substream->private_data;
 407         struct snd_pcm_runtime *runtime = substream->runtime;
 408         long location;
 409
 410         spin_lock(&stream->dma_lock);
 411         location = get_dma_residue(stream->dma);
 412         spin_unlock(&stream->dma_lock);
 413         location = stream->buffer->relative_end - location;
 414         if (location == -1)
 415                 location = 0;
 416         return bytes_to_frames(runtime,location);
 417 }
 418
 419 static struct snd_pcm_ops snd_card_au1000_playback_ops = {
 420         .open                   = snd_au1000_playback_open,
 421         .close                  = snd_au1000_playback_close,
 422         .ioctl                  = snd_pcm_lib_ioctl,
 423         .hw_params              = snd_au1000_hw_params,
 424         .hw_free                = snd_au1000_hw_free,
 425         .prepare                = snd_au1000_playback_prepare,
 426         .trigger                = snd_au1000_trigger,
 427         .pointer                = snd_au1000_pointer,
 428 };
 429
 430 static struct snd_pcm_ops snd_card_au1000_capture_ops = {
 431         .open                   = snd_au1000_capture_open,
 432         .close                  = snd_au1000_capture_close,
 433         .ioctl                  = snd_pcm_lib_ioctl,
 434         .hw_params              = snd_au1000_hw_params,
 435         .hw_free                = snd_au1000_hw_free,
 436         .prepare                = snd_au1000_capture_prepare,
 437         .trigger                = snd_au1000_trigger,
 438         .pointer                = snd_au1000_pointer,
 439 };
 440
 441 static int __devinit
 442 snd_au1000_pcm_new(struct snd_au1000 *au1000)
 443 {
 444         struct snd_pcm *pcm;
 445         int err;
 446         unsigned long flags;
 447
 448         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
 449                 return err;
 450
 451         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 452                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
 453
 454         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 455                 &snd_card_au1000_playback_ops);
 456         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 457                 &snd_card_au1000_capture_ops);
 458
 459         pcm->private_data = au1000;
 460         pcm->info_flags = 0;
 461         strcpy(pcm->name, "Au1000 AC97 PCM");
 462
 463         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
 464         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 465
 466         flags = claim_dma_lock();
 467         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 468                         "AC97 TX", au1000_dma_interrupt, IRQF_DISABLED,
 469                         au1000->stream[PLAYBACK])) < 0) {
 470                 release_dma_lock(flags);
 471                 return -EBUSY;
 472         }
 473         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
 474                         "AC97 RX", au1000_dma_interrupt, IRQF_DISABLED,
 475                         au1000->stream[CAPTURE])) < 0){
 476                 release_dma_lock(flags);
 477                 return -EBUSY;
 478         }
 479         /* enable DMA coherency in read/write DMA channels */
 480         set_dma_mode(au1000->stream[PLAYBACK]->dma,
 481                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
 482         set_dma_mode(au1000->stream[CAPTURE]->dma,
 483                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 484         release_dma_lock(flags);
 485         au1000->pcm = pcm;
 486         return 0;
 487 }
 488
 489
 490 /*-------------------------- AC97 CODEC Control ------------------------------*/
 491
 492 static unsigned short
 493 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 494 {
 495         struct snd_au1000 *au1000 = ac97->private_data;
 496         u32 volatile cmd;
 497         u16 volatile data;
 498         int             i;
 499
 500         spin_lock(&au1000->ac97_lock);
 501 /* would rather use the interrupt than this polling but it works and I can't
 502 get the interrupt driven case to work efficiently */
 503         for (i = 0; i < 0x5000; i++)
 504                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 505                         break;
 506         if (i == 0x5000)
 507                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 508
 509         cmd = (u32) reg & AC97C_INDEX_MASK;
 510         cmd |= AC97C_READ;
 511         au1000->ac97_ioport->cmd = cmd;
 512
 513         /* now wait for the data */
 514         for (i = 0; i < 0x5000; i++)
 515                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 516                         break;
 517         if (i == 0x5000) {
 518                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 519                 return 0;
 520         }
 521
 522         data = au1000->ac97_ioport->cmd & 0xffff;
 523         spin_unlock(&au1000->ac97_lock);
 524
 525         return data;
 526
 527 }
 528
 529
 530 static void
 531 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
 532 {
 533         struct snd_au1000 *au1000 = ac97->private_data;
 534         u32 cmd;
 535         int i;
 536
 537         spin_lock(&au1000->ac97_lock);
 538 /* would rather use the interrupt than this polling but it works and I can't
 539 get the interrupt driven case to work efficiently */
 540         for (i = 0; i < 0x5000; i++)
 541                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 542                         break;
 543         if (i == 0x5000)
 544                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
 545
 546         cmd = (u32) reg & AC97C_INDEX_MASK;
 547         cmd &= ~AC97C_READ;
 548         cmd |= ((u32) val << AC97C_WD_BIT);
 549         au1000->ac97_ioport->cmd = cmd;
 550         spin_unlock(&au1000->ac97_lock);
 551 }
 552
 553 static int __devinit
 554 snd_au1000_ac97_new(struct snd_au1000 *au1000)
 555 {
 556         int err;
 557         struct snd_ac97_bus *pbus;
 558         struct snd_ac97_template ac97;
 559         static struct snd_ac97_bus_ops ops = {
 560                 .write = snd_au1000_ac97_write,
 561                 .read = snd_au1000_ac97_read,
 562         };
 563
 564         if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
 565                         0x100000, "Au1x00 AC97")) == NULL) {
 566                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
 567                 return -EBUSY;
 568         }
 569         au1000->ac97_ioport = (struct au1000_ac97_reg *)
 570                 KSEG1ADDR(au1000->ac97_res_port->start);
 571
 572         spin_lock_init(&au1000->ac97_lock);
 573
 574         /* configure pins for AC'97
 575         TODO: move to board_setup.c */
 576         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
 577
 578         /* Initialise Au1000's AC'97 Control Block */
 579         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
 580         udelay(10);
 581         au1000->ac97_ioport->cntrl = AC97C_CE;
 582         udelay(10);
 583
 584         /* Initialise External CODEC -- cold reset */
 585         au1000->ac97_ioport->config = AC97C_RESET;
 586         udelay(10);
 587         au1000->ac97_ioport->config = 0x0;
 588         mdelay(5);
 589
 590         /* Initialise AC97 middle-layer */
 591         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 592                 return err;
 593
 594         memset(&ac97, 0, sizeof(ac97));
 595         ac97.private_data = au1000;
 596         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 597                 return err;
 598
 599         return 0;
 600 }
 601
 602 /*------------------------------ Setup / Destroy ----------------------------*/
 603
 604 void
 605 snd_au1000_free(struct snd_card *card)
 606 {
 607         struct snd_au1000 *au1000 = card->private_data;
 608
 609         if (au1000->ac97_res_port) {
 610                 /* put internal AC97 block into reset */
 611                 au1000->ac97_ioport->cntrl = AC97C_RS;
 612                 au1000->ac97_ioport = NULL;
 613                 release_and_free_resource(au1000->ac97_res_port);
 614         }
 615
 616         if (au1000->stream[PLAYBACK]) {
 617                 if (au1000->stream[PLAYBACK]->dma >= 0)
 618                         free_au1000_dma(au1000->stream[PLAYBACK]->dma);
 619                 kfree(au1000->stream[PLAYBACK]);
 620         }
 621
 622         if (au1000->stream[CAPTURE]) {
 623                 if (au1000->stream[CAPTURE]->dma >= 0)
 624                         free_au1000_dma(au1000->stream[CAPTURE]->dma);
 625                 kfree(au1000->stream[CAPTURE]);
 626         }
 627 }
 628
 629
 630 static struct snd_card *au1000_card;
 631
 632 static int __init
 633 au1000_init(void)
 634 {
 635         int err;
 636         struct snd_card *card;
 637         struct snd_au1000 *au1000;
 638
 639         card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(struct snd_au1000));
 640         if (card == NULL)
 641                 return -ENOMEM;
 642
 643         card->private_free = snd_au1000_free;
 644         au1000 = card->private_data;
 645         au1000->card = card;
 646
 647         au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 648         au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 649         /* so that snd_au1000_free will work as intended */
 650         au1000->ac97_res_port = NULL;
 651         if (au1000->stream[PLAYBACK])
 652                 au1000->stream[PLAYBACK]->dma = -1;
 653         if (au1000->stream[CAPTURE ])
 654                 au1000->stream[CAPTURE ]->dma = -1;
 655
 656         if (au1000->stream[PLAYBACK] == NULL ||
 657             au1000->stream[CAPTURE ] == NULL) {
 658                 snd_card_free(card);
 659                 return -ENOMEM;
 660         }
 661
 662         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
 663                 snd_card_free(card);
 664                 return err;
 665         }
 666
 667         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
 668                 snd_card_free(card);
 669                 return err;
 670         }
 671
 672         strcpy(card->driver, "Au1000-AC97");
 673         strcpy(card->shortname, "AMD Au1000-AC97");
 674         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
 675
 676         if ((err = snd_card_register(card)) < 0) {
 677                 snd_card_free(card);
 678                 return err;
 679         }
 680
 681         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
 682         au1000_card = card;
 683         return 0;
 684 }
 685
 686 static void __exit au1000_exit(void)
 687 {
 688         snd_card_free(au1000_card);
 689 }
 690
 691 module_init(au1000_init);
 692 module_exit(au1000_exit);
 693