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         snd_assert(stream->buffer, return);
 194         disable_dma(stream->dma);
 195 }
 196
 197 static void
 198 au1000_dma_start(struct audio_stream *stream)
 199 {
 200         snd_assert(stream->buffer, return);
 201
 202         init_dma(stream->dma);
 203         if (get_dma_active_buffer(stream->dma) == 0) {
 204                 clear_dma_done0(stream->dma);
 205                 set_dma_addr0(stream->dma, stream->buffer->start);
 206                 set_dma_count0(stream->dma, stream->period_size >> 1);
 207                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 208                 set_dma_count1(stream->dma, stream->period_size >> 1);
 209         } else {
 210                 clear_dma_done1(stream->dma);
 211                 set_dma_addr1(stream->dma, stream->buffer->start);
 212                 set_dma_count1(stream->dma, stream->period_size >> 1);
 213                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 214                 set_dma_count0(stream->dma, stream->period_size >> 1);
 215         }
 216         enable_dma_buffers(stream->dma);
 217         start_dma(stream->dma);
 218 }
 219
 220 static irqreturn_t
 221 au1000_dma_interrupt(int irq, void *dev_id)
 222 {
 223         struct audio_stream *stream = (struct audio_stream *) dev_id;
 224         struct snd_pcm_substream *substream = stream->substream;
 225
 226         spin_lock(&stream->dma_lock);
 227         switch (get_dma_buffer_done(stream->dma)) {
 228         case DMA_D0:
 229                 stream->buffer = stream->buffer->next;
 230                 clear_dma_done0(stream->dma);
 231                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 232                 set_dma_count0(stream->dma, stream->period_size >> 1);
 233                 enable_dma_buffer0(stream->dma);
 234                 break;
 235         case DMA_D1:
 236                 stream->buffer = stream->buffer->next;
 237                 clear_dma_done1(stream->dma);
 238                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 239                 set_dma_count1(stream->dma, stream->period_size >> 1);
 240                 enable_dma_buffer1(stream->dma);
 241                 break;
 242         case (DMA_D0 | DMA_D1):
 243                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
 244                 au1000_dma_stop(stream);
 245                 au1000_dma_start(stream);
 246                 break;
 247         case (~DMA_D0 & ~DMA_D1):
 248                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
 249         }
 250         spin_unlock(&stream->dma_lock);
 251         snd_pcm_period_elapsed(substream);
 252         return IRQ_HANDLED;
 253 }
 254
 255 /*-------------------------- PCM Audio Streams -------------------------------*/
 256
 257 static unsigned int rates[] = {8000, 11025, 16000, 22050};
 258 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
 259         .count  = ARRAY_SIZE(rates),
 260         .list   = rates,
 261         .mask   = 0,
 262 };
 263
 264 static struct snd_pcm_hardware snd_au1000_hw =
 265 {
 266         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
 267                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
 268         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 269         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
 270                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
 271         .rate_min               = 8000,
 272         .rate_max               = 22050,
 273         .channels_min           = 1,
 274         .channels_max           = 2,
 275         .buffer_bytes_max       = 128*1024,
 276         .period_bytes_min       = 32,
 277         .period_bytes_max       = 16*1024,
 278         .periods_min            = 8,
 279         .periods_max            = 255,
 280         .fifo_size              = 16,
 281 };
 282
 283 static int
 284 snd_au1000_playback_open(struct snd_pcm_substream *substream)
 285 {
 286         struct snd_au1000 *au1000 = substream->pcm->private_data;
 287
 288         au1000->stream[PLAYBACK]->substream = substream;
 289         au1000->stream[PLAYBACK]->buffer = NULL;
 290         substream->private_data = au1000->stream[PLAYBACK];
 291         substream->runtime->hw = snd_au1000_hw;
 292         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 293                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 294 }
 295
 296 static int
 297 snd_au1000_capture_open(struct snd_pcm_substream *substream)
 298 {
 299         struct snd_au1000 *au1000 = substream->pcm->private_data;
 300
 301         au1000->stream[CAPTURE]->substream = substream;
 302         au1000->stream[CAPTURE]->buffer = NULL;
 303         substream->private_data = au1000->stream[CAPTURE];
 304         substream->runtime->hw = snd_au1000_hw;
 305         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 306                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 307 }
 308
 309 static int
 310 snd_au1000_playback_close(struct snd_pcm_substream *substream)
 311 {
 312         struct snd_au1000 *au1000 = substream->pcm->private_data;
 313
 314         au1000->stream[PLAYBACK]->substream = NULL;
 315         return 0;
 316 }
 317
 318 static int
 319 snd_au1000_capture_close(struct snd_pcm_substream *substream)
 320 {
 321         struct snd_au1000 *au1000 = substream->pcm->private_data;
 322
 323         au1000->stream[CAPTURE]->substream = NULL;
 324         return 0;
 325 }
 326
 327 static int
 328 snd_au1000_hw_params(struct snd_pcm_substream *substream,
 329                                         struct snd_pcm_hw_params *hw_params)
 330 {
 331         struct audio_stream *stream = substream->private_data;
 332         int err;
 333
 334         err = snd_pcm_lib_malloc_pages(substream,
 335                                        params_buffer_bytes(hw_params));
 336         if (err < 0)
 337                 return err;
 338         return au1000_setup_dma_link(stream,
 339                                      params_period_bytes(hw_params),
 340                                      params_periods(hw_params));
 341 }
 342
 343 static int
 344 snd_au1000_hw_free(struct snd_pcm_substream *substream)
 345 {
 346         struct audio_stream *stream = substream->private_data;
 347         au1000_release_dma_link(stream);
 348         return snd_pcm_lib_free_pages(substream);
 349 }
 350
 351 static int
 352 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
 353 {
 354         struct snd_au1000 *au1000 = substream->pcm->private_data;
 355         struct snd_pcm_runtime *runtime = substream->runtime;
 356
 357         if (runtime->channels == 1)
 358                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
 359         else
 360                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 361         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 362         return 0;
 363 }
 364
 365 static int
 366 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
 367 {
 368         struct snd_au1000 *au1000 = substream->pcm->private_data;
 369         struct snd_pcm_runtime *runtime = substream->runtime;
 370
 371         if (runtime->channels == 1)
 372                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
 373         else
 374                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 375         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 376         return 0;
 377 }
 378
 379 static int
 380 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
 381 {
 382         struct audio_stream *stream = substream->private_data;
 383         int err = 0;
 384
 385         spin_lock(&stream->dma_lock);
 386         switch (cmd) {
 387         case SNDRV_PCM_TRIGGER_START:
 388                 au1000_dma_start(stream);
 389                 break;
 390         case SNDRV_PCM_TRIGGER_STOP:
 391                 au1000_dma_stop(stream);
 392                 break;
 393         default:
 394                 err = -EINVAL;
 395                 break;
 396         }
 397         spin_unlock(&stream->dma_lock);
 398         return err;
 399 }
 400
 401 static snd_pcm_uframes_t
 402 snd_au1000_pointer(struct snd_pcm_substream *substream)
 403 {
 404         struct audio_stream *stream = substream->private_data;
 405         struct snd_pcm_runtime *runtime = substream->runtime;
 406         long location;
 407
 408         spin_lock(&stream->dma_lock);
 409         location = get_dma_residue(stream->dma);
 410         spin_unlock(&stream->dma_lock);
 411         location = stream->buffer->relative_end - location;
 412         if (location == -1)
 413                 location = 0;
 414         return bytes_to_frames(runtime,location);
 415 }
 416
 417 static struct snd_pcm_ops snd_card_au1000_playback_ops = {
 418         .open                   = snd_au1000_playback_open,
 419         .close                  = snd_au1000_playback_close,
 420         .ioctl                  = snd_pcm_lib_ioctl,
 421         .hw_params              = snd_au1000_hw_params,
 422         .hw_free                = snd_au1000_hw_free,
 423         .prepare                = snd_au1000_playback_prepare,
 424         .trigger                = snd_au1000_trigger,
 425         .pointer                = snd_au1000_pointer,
 426 };
 427
 428 static struct snd_pcm_ops snd_card_au1000_capture_ops = {
 429         .open                   = snd_au1000_capture_open,
 430         .close                  = snd_au1000_capture_close,
 431         .ioctl                  = snd_pcm_lib_ioctl,
 432         .hw_params              = snd_au1000_hw_params,
 433         .hw_free                = snd_au1000_hw_free,
 434         .prepare                = snd_au1000_capture_prepare,
 435         .trigger                = snd_au1000_trigger,
 436         .pointer                = snd_au1000_pointer,
 437 };
 438
 439 static int __devinit
 440 snd_au1000_pcm_new(struct snd_au1000 *au1000)
 441 {
 442         struct snd_pcm *pcm;
 443         int err;
 444         unsigned long flags;
 445
 446         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
 447                 return err;
 448
 449         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 450                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
 451
 452         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 453                 &snd_card_au1000_playback_ops);
 454         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 455                 &snd_card_au1000_capture_ops);
 456
 457         pcm->private_data = au1000;
 458         pcm->info_flags = 0;
 459         strcpy(pcm->name, "Au1000 AC97 PCM");
 460
 461         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
 462         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 463
 464         flags = claim_dma_lock();
 465         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 466                         "AC97 TX", au1000_dma_interrupt, IRQF_DISABLED,
 467                         au1000->stream[PLAYBACK])) < 0) {
 468                 release_dma_lock(flags);
 469                 return -EBUSY;
 470         }
 471         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
 472                         "AC97 RX", au1000_dma_interrupt, IRQF_DISABLED,
 473                         au1000->stream[CAPTURE])) < 0){
 474                 release_dma_lock(flags);
 475                 return -EBUSY;
 476         }
 477         /* enable DMA coherency in read/write DMA channels */
 478         set_dma_mode(au1000->stream[PLAYBACK]->dma,
 479                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
 480         set_dma_mode(au1000->stream[CAPTURE]->dma,
 481                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 482         release_dma_lock(flags);
 483         au1000->pcm = pcm;
 484         return 0;
 485 }
 486
 487
 488 /*-------------------------- AC97 CODEC Control ------------------------------*/
 489
 490 static unsigned short
 491 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 492 {
 493         struct snd_au1000 *au1000 = ac97->private_data;
 494         u32 volatile cmd;
 495         u16 volatile data;
 496         int             i;
 497
 498         spin_lock(&au1000->ac97_lock);
 499 /* would rather use the interrupt than this polling but it works and I can't
 500 get the interrupt driven case to work efficiently */
 501         for (i = 0; i < 0x5000; i++)
 502                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 503                         break;
 504         if (i == 0x5000)
 505                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 506
 507         cmd = (u32) reg & AC97C_INDEX_MASK;
 508         cmd |= AC97C_READ;
 509         au1000->ac97_ioport->cmd = cmd;
 510
 511         /* now wait for the data */
 512         for (i = 0; i < 0x5000; i++)
 513                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 514                         break;
 515         if (i == 0x5000) {
 516                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 517                 return 0;
 518         }
 519
 520         data = au1000->ac97_ioport->cmd & 0xffff;
 521         spin_unlock(&au1000->ac97_lock);
 522
 523         return data;
 524
 525 }
 526
 527
 528 static void
 529 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
 530 {
 531         struct snd_au1000 *au1000 = ac97->private_data;
 532         u32 cmd;
 533         int i;
 534
 535         spin_lock(&au1000->ac97_lock);
 536 /* would rather use the interrupt than this polling but it works and I can't
 537 get the interrupt driven case to work efficiently */
 538         for (i = 0; i < 0x5000; i++)
 539                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 540                         break;
 541         if (i == 0x5000)
 542                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
 543
 544         cmd = (u32) reg & AC97C_INDEX_MASK;
 545         cmd &= ~AC97C_READ;
 546         cmd |= ((u32) val << AC97C_WD_BIT);
 547         au1000->ac97_ioport->cmd = cmd;
 548         spin_unlock(&au1000->ac97_lock);
 549 }
 550
 551 static int __devinit
 552 snd_au1000_ac97_new(struct snd_au1000 *au1000)
 553 {
 554         int err;
 555         struct snd_ac97_bus *pbus;
 556         struct snd_ac97_template ac97;
 557         static struct snd_ac97_bus_ops ops = {
 558                 .write = snd_au1000_ac97_write,
 559                 .read = snd_au1000_ac97_read,
 560         };
 561
 562         if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
 563                         0x100000, "Au1x00 AC97")) == NULL) {
 564                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
 565                 return -EBUSY;
 566         }
 567         au1000->ac97_ioport = (struct au1000_ac97_reg *)
 568                 KSEG1ADDR(au1000->ac97_res_port->start);
 569
 570         spin_lock_init(&au1000->ac97_lock);
 571
 572         /* configure pins for AC'97
 573         TODO: move to board_setup.c */
 574         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
 575
 576         /* Initialise Au1000's AC'97 Control Block */
 577         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
 578         udelay(10);
 579         au1000->ac97_ioport->cntrl = AC97C_CE;
 580         udelay(10);
 581
 582         /* Initialise External CODEC -- cold reset */
 583         au1000->ac97_ioport->config = AC97C_RESET;
 584         udelay(10);
 585         au1000->ac97_ioport->config = 0x0;
 586         mdelay(5);
 587
 588         /* Initialise AC97 middle-layer */
 589         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 590                 return err;
 591
 592         memset(&ac97, 0, sizeof(ac97));
 593         ac97.private_data = au1000;
 594         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 595                 return err;
 596
 597         return 0;
 598 }
 599
 600 /*------------------------------ Setup / Destroy ----------------------------*/
 601
 602 void
 603 snd_au1000_free(struct snd_card *card)
 604 {
 605         struct snd_au1000 *au1000 = card->private_data;
 606
 607         if (au1000->ac97_res_port) {
 608                 /* put internal AC97 block into reset */
 609                 au1000->ac97_ioport->cntrl = AC97C_RS;
 610                 au1000->ac97_ioport = NULL;
 611                 release_and_free_resource(au1000->ac97_res_port);
 612         }
 613
 614         if (au1000->stream[PLAYBACK]) {
 615                 if (au1000->stream[PLAYBACK]->dma >= 0)
 616                         free_au1000_dma(au1000->stream[PLAYBACK]->dma);
 617                 kfree(au1000->stream[PLAYBACK]);
 618         }
 619
 620         if (au1000->stream[CAPTURE]) {
 621                 if (au1000->stream[CAPTURE]->dma >= 0)
 622                         free_au1000_dma(au1000->stream[CAPTURE]->dma);
 623                 kfree(au1000->stream[CAPTURE]);
 624         }
 625 }
 626
 627
 628 static struct snd_card *au1000_card;
 629
 630 static int __init
 631 au1000_init(void)
 632 {
 633         int err;
 634         struct snd_card *card;
 635         struct snd_au1000 *au1000;
 636
 637         card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(struct snd_au1000));
 638         if (card == NULL)
 639                 return -ENOMEM;
 640
 641         card->private_free = snd_au1000_free;
 642         au1000 = card->private_data;
 643         au1000->card = card;
 644
 645         au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 646         au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 647         /* so that snd_au1000_free will work as intended */
 648         au1000->ac97_res_port = NULL;
 649         if (au1000->stream[PLAYBACK])
 650                 au1000->stream[PLAYBACK]->dma = -1;
 651         if (au1000->stream[CAPTURE ])
 652                 au1000->stream[CAPTURE ]->dma = -1;
 653
 654         if (au1000->stream[PLAYBACK] == NULL ||
 655             au1000->stream[CAPTURE ] == NULL) {
 656                 snd_card_free(card);
 657                 return -ENOMEM;
 658         }
 659
 660         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
 661                 snd_card_free(card);
 662                 return err;
 663         }
 664
 665         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
 666                 snd_card_free(card);
 667                 return err;
 668         }
 669
 670         strcpy(card->driver, "Au1000-AC97");
 671         strcpy(card->shortname, "AMD Au1000-AC97");
 672         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
 673
 674         if ((err = snd_card_register(card)) < 0) {
 675                 snd_card_free(card);
 676                 return err;
 677         }
 678
 679         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
 680         au1000_card = card;
 681         return 0;
 682 }
 683
 684 static void __exit au1000_exit(void)
 685 {
 686         snd_card_free(au1000_card);
 687 }
 688
 689 module_init(au1000_init);
 690 module_exit(au1000_exit);
 691