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 <sound/driver.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/version.h>
  43 #include <sound/core.h>
  44 #include <sound/initval.h>
  45 #include <sound/pcm.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 typedef struct au1000_period au1000_period_t;
  67 struct au1000_period
  68 {
  69         u32 start;
  70         u32 relative_end;       /*realtive to start of buffer*/
  71         au1000_period_t * next;
  72 };
  73
  74 /*Au1000 AC97 Port Control Reisters*/
  75 typedef struct au1000_ac97_reg au1000_ac97_reg_t;
  76 struct au1000_ac97_reg {
  77         u32 volatile config;
  78         u32 volatile status;
  79         u32 volatile data;
  80         u32 volatile cmd;
  81         u32 volatile cntrl;
  82 };
  83
  84 typedef struct audio_stream audio_stream_t;
  85 struct audio_stream {
  86         snd_pcm_substream_t * substream;
  87         int dma;
  88         spinlock_t dma_lock;
  89         au1000_period_t * buffer;
  90         unsigned int period_size;
  91         unsigned int periods;
  92 };
  93
  94 typedef struct snd_card_au1000 {
  95         snd_card_t *card;
  96         au1000_ac97_reg_t volatile *ac97_ioport;
  97
  98         struct resource *ac97_res_port;
  99         spinlock_t ac97_lock;
 100         ac97_t *ac97;
 101
 102         snd_pcm_t *pcm;
 103         audio_stream_t *stream[2];      /* playback & capture */
 104 } au1000_t;
 105
 106 /*--------------------------- Local Functions --------------------------------*/
 107 static void
 108 au1000_set_ac97_xmit_slots(au1000_t *au1000, long xmit_slots)
 109 {
 110         u32 volatile ac97_config;
 111
 112         spin_lock(&au1000->ac97_lock);
 113         ac97_config = au1000->ac97_ioport->config;
 114         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
 115         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
 116         au1000->ac97_ioport->config = ac97_config;
 117         spin_unlock(&au1000->ac97_lock);
 118 }
 119
 120 static void
 121 au1000_set_ac97_recv_slots(au1000_t *au1000, long recv_slots)
 122 {
 123         u32 volatile ac97_config;
 124
 125         spin_lock(&au1000->ac97_lock);
 126         ac97_config = au1000->ac97_ioport->config;
 127         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
 128         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
 129         au1000->ac97_ioport->config = ac97_config;
 130         spin_unlock(&au1000->ac97_lock);
 131 }
 132
 133
 134 static void
 135 au1000_release_dma_link(audio_stream_t *stream)
 136 {
 137         au1000_period_t * pointer;
 138         au1000_period_t * pointer_next;
 139
 140         stream->period_size = 0;
 141         stream->periods = 0;
 142         pointer = stream->buffer;
 143         if (! pointer)
 144                 return;
 145         do {
 146                 pointer_next = pointer->next;
 147                 kfree(pointer);
 148                 pointer = pointer_next;
 149         } while (pointer != stream->buffer);
 150         stream->buffer = NULL;
 151 }
 152
 153 static int
 154 au1000_setup_dma_link(audio_stream_t *stream, unsigned int period_bytes,
 155                       unsigned int periods)
 156 {
 157         snd_pcm_substream_t *substream = stream->substream;
 158         snd_pcm_runtime_t *runtime = substream->runtime;
 159         unsigned long dma_start;
 160         int i;
 161
 162         dma_start = virt_to_phys(runtime->dma_area);
 163
 164         if (stream->period_size == period_bytes &&
 165             stream->periods == periods)
 166                 return 0; /* not changed */
 167
 168         au1000_release_dma_link(stream);
 169
 170         stream->period_size = period_bytes;
 171         stream->periods = periods;
 172
 173         stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
 174         if (! stream->buffer)
 175                 return -ENOMEM;
 176         pointer = stream->buffer;
 177         for (i = 0; i < periods; i++) {
 178                 pointer->start = (u32)(dma_start + (i * period_bytes));
 179                 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
 180                 if (i < periods - 1) {
 181                         pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
 182                         if (! pointer->next) {
 183                                 au1000_release_dma_link(stream);
 184                                 return -ENOMEM;
 185                         }
 186                         pointer = pointer->next;
 187                 }
 188         }
 189         pointer->next = stream->buffer;
 190         return 0;
 191 }
 192
 193 static void
 194 au1000_dma_stop(audio_stream_t *stream)
 195 {
 196         snd_assert(stream->buffer, return);
 197         disable_dma(stream->dma);
 198 }
 199
 200 static void
 201 au1000_dma_start(audio_stream_t *stream)
 202 {
 203         snd_assert(stream->buffer, 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, struct pt_regs *regs)
 225 {
 226         audio_stream_t *stream = (audio_stream_t *) dev_id;
 227         snd_pcm_substream_t *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 snd_pcm_hw_constraint_list_t hw_constraints_rates = {
 262         .count  =  sizeof(rates) / sizeof(rates[0]),
 263         .list   = rates,
 264         .mask   = 0,
 265 };
 266
 267 static snd_pcm_hardware_t 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(snd_pcm_substream_t * substream)
 288 {
 289         au1000_t *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(snd_pcm_substream_t * substream)
 301 {
 302         au1000_t *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
 313 static int
 314 snd_au1000_playback_close(snd_pcm_substream_t * substream)
 315 {
 316         au1000_t *au1000 = substream->pcm->private_data;
 317
 318         au1000->stream[PLAYBACK]->substream = NULL;
 319         return 0;
 320 }
 321
 322 static int
 323 snd_au1000_capture_close(snd_pcm_substream_t * substream)
 324 {
 325         au1000_t *au1000 = substream->pcm->private_data;
 326
 327         au1000->stream[CAPTURE]->substream = NULL;
 328         return 0;
 329 }
 330
 331 static int
 332 snd_au1000_hw_params(snd_pcm_substream_t * substream,
 333                                         snd_pcm_hw_params_t * hw_params)
 334 {
 335         audio_stream_t *stream = substream->private_data;
 336         int err;
 337
 338         err = snd_pcm_lib_malloc_pages(substream,
 339                                        params_buffer_bytes(hw_params));
 340         if (err < 0)
 341                 return err;
 342         return au1000_setup_dma_link(stream,
 343                                      params_period_bytes(hw_params),
 344                                      params_periods(hw_params));
 345 }
 346
 347 static int
 348 snd_au1000_hw_free(snd_pcm_substream_t * substream)
 349 {
 350         audio_stream_t *stream = substream->private_data;
 351         au1000_release_dma_link(stream);
 352         return snd_pcm_lib_free_pages(substream);
 353 }
 354
 355 static int
 356 snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
 357 {
 358         au1000_t *au1000 = substream->pcm->private_data;
 359         snd_pcm_runtime_t *runtime = substream->runtime;
 360
 361         if (runtime->channels == 1)
 362                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
 363         else
 364                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 365         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 366         return 0;
 367 }
 368
 369 static int
 370 snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
 371 {
 372         au1000_t *au1000 = substream->pcm->private_data;
 373         snd_pcm_runtime_t *runtime = substream->runtime;
 374
 375         if (runtime->channels == 1)
 376                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
 377         else
 378                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 379         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 380         return 0;
 381 }
 382
 383 static int
 384 snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
 385 {
 386         audio_stream_t *stream = substream->private_data;
 387         int err = 0;
 388
 389         spin_lock(&stream->dma_lock);
 390         switch (cmd) {
 391         case SNDRV_PCM_TRIGGER_START:
 392                 au1000_dma_start(stream);
 393                 break;
 394         case SNDRV_PCM_TRIGGER_STOP:
 395                 au1000_dma_stop(stream);
 396                 break;
 397         default:
 398                 err = -EINVAL;
 399                 break;
 400         }
 401         spin_unlock(&stream->dma_lock);
 402         return err;
 403 }
 404
 405 static snd_pcm_uframes_t
 406 snd_au1000_pointer(snd_pcm_substream_t * substream)
 407 {
 408         audio_stream_t *stream = substream->private_data;
 409         snd_pcm_runtime_t *runtime = substream->runtime;
 410         long location;
 411
 412         spin_lock(&stream->dma_lock);
 413         location = get_dma_residue(stream->dma);
 414         spin_unlock(&stream->dma_lock);
 415         location = stream->buffer->relative_end - location;
 416         if (location == -1)
 417                 location = 0;
 418         return bytes_to_frames(runtime,location);
 419 }
 420
 421 static snd_pcm_ops_t snd_card_au1000_playback_ops = {
 422         .open                   = snd_au1000_playback_open,
 423         .close                  = snd_au1000_playback_close,
 424         .ioctl                  = snd_pcm_lib_ioctl,
 425         .hw_params              = snd_au1000_hw_params,
 426         .hw_free                = snd_au1000_hw_free,
 427         .prepare                = snd_au1000_playback_prepare,
 428         .trigger                = snd_au1000_trigger,
 429         .pointer                = snd_au1000_pointer,
 430 };
 431
 432 static snd_pcm_ops_t snd_card_au1000_capture_ops = {
 433         .open                   = snd_au1000_capture_open,
 434         .close                  = snd_au1000_capture_close,
 435         .ioctl                  = snd_pcm_lib_ioctl,
 436         .hw_params              = snd_au1000_hw_params,
 437         .hw_free                = snd_au1000_hw_free,
 438         .prepare                = snd_au1000_capture_prepare,
 439         .trigger                = snd_au1000_trigger,
 440         .pointer                = snd_au1000_pointer,
 441 };
 442
 443 static int __devinit
 444 snd_au1000_pcm_new(void)
 445 {
 446         snd_pcm_t *pcm;
 447         int err;
 448         unsigned long flags;
 449
 450         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
 451                 return err;
 452
 453         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 454                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
 455
 456         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 457                 &snd_card_au1000_playback_ops);
 458         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 459                 &snd_card_au1000_capture_ops);
 460
 461         pcm->private_data = au1000;
 462         pcm->info_flags = 0;
 463         strcpy(pcm->name, "Au1000 AC97 PCM");
 464
 465         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
 466         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 467
 468         flags = claim_dma_lock();
 469         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 470                         "AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
 471                         au1000->stream[PLAYBACK])) < 0) {
 472                 release_dma_lock(flags);
 473                 return -EBUSY;
 474         }
 475         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
 476                         "AC97 RX", au1000_dma_interrupt, SA_INTERRUPT,
 477                         au1000->stream[CAPTURE])) < 0){
 478                 release_dma_lock(flags);
 479                 return -EBUSY;
 480         }
 481         /* enable DMA coherency in read/write DMA channels */
 482         set_dma_mode(au1000->stream[PLAYBACK]->dma,
 483                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
 484         set_dma_mode(au1000->stream[CAPTURE]->dma,
 485                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 486         release_dma_lock(flags);
 487         au1000->pcm = pcm;
 488         return 0;
 489 }
 490
 491
 492 /*-------------------------- AC97 CODEC Control ------------------------------*/
 493
 494 static unsigned short
 495 snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
 496 {
 497         au1000_t *au1000 = ac97->private_data;
 498         u32 volatile cmd;
 499         u16 volatile data;
 500         int             i;
 501
 502         spin_lock(&au1000->ac97_lock);
 503 /* would rather use the interupt than this polling but it works and I can't
 504 get the interupt driven case to work efficiently */
 505         for (i = 0; i < 0x5000; i++)
 506                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 507                         break;
 508         if (i == 0x5000)
 509                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 510
 511         cmd = (u32) reg & AC97C_INDEX_MASK;
 512         cmd |= AC97C_READ;
 513         au1000->ac97_ioport->cmd = cmd;
 514
 515         /* now wait for the data */
 516         for (i = 0; i < 0x5000; i++)
 517                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 518                         break;
 519         if (i == 0x5000) {
 520                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 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(ac97_t *ac97, unsigned short reg, unsigned short val)
 534 {
 535         au1000_t *au1000 = ac97->private_data;
 536         u32 cmd;
 537         int i;
 538
 539         spin_lock(&au1000->ac97_lock);
 540 /* would rather use the interupt than this polling but it works and I can't
 541 get the interupt 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(au1000_t *au1000)
 557 {
 558         int err;
 559         ac97_bus_t bus, *pbus;
 560         ac97_t ac97;
 561
 562         if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
 563                         sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
 564                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
 565                 return -EBUSY;
 566         }
 567         au1000->ac97_ioport = (au1000_ac97_reg_t *) au1000->ac97_res_port->start;
 568
 569         spin_lock_init(&au1000->ac97_lock);
 570
 571         /* configure pins for AC'97
 572         TODO: move to board_setup.c */
 573         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
 574
 575         /* Initialise Au1000's AC'97 Control Block */
 576         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
 577         udelay(10);
 578         au1000->ac97_ioport->cntrl = AC97C_CE;
 579         udelay(10);
 580
 581         /* Initialise External CODEC -- cold reset */
 582         au1000->ac97_ioport->config = AC97C_RESET;
 583         udelay(10);
 584         au1000->ac97_ioport->config = 0x0;
 585         mdelay(5);
 586
 587         /* Initialise AC97 middle-layer */
 588         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 589                 return err;
 590
 591         memset(&ac97, 0, sizeof(ac97));
 592         ac97.private_data = au1000;
 593         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 594                 return err;
 595
 596         return 0;
 597 }
 598
 599 /*------------------------------ Setup / Destroy ----------------------------*/
 600
 601 void
 602 snd_au1000_free(snd_card_t *card)
 603 {
 604         au1000_t *au1000 = card->private_data;
 605
 606         if (au1000->ac97_res_port) {
 607                 /* put internal AC97 block into reset */
 608                 au1000->ac97_ioport->cntrl = AC97C_RS;
 609                 au1000->ac97_ioport = NULL;
 610                 release_and_free_resource(au1000->ac97_res_port);
 611         }
 612
 613         if (au1000->stream[PLAYBACK]->dma >= 0)
 614                 free_au1000_dma(au1000->stream[PLAYBACK]->dma);
 615
 616         if (au1000->stream[CAPTURE]->dma >= 0)
 617                 free_au1000_dma(au1000->stream[CAPTURE]->dma);
 618
 619         kfree(au1000->stream[PLAYBACK]);
 620         kfree(au1000->stream[CAPTURE]);
 621 }
 622
 623
 624 static snd_card_t *au1000_card;
 625
 626 static int __init
 627 au1000_init(void)
 628 {
 629         int err;
 630         snd_card_t *card;
 631         au1000_t *au1000;
 632
 633         card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
 634         if (card == NULL)
 635                 return -ENOMEM;
 636
 637         card->private_free = snd_au1000_free;
 638         au1000 = card->private_data;
 639         /* so that snd_au1000_free will work as intended */
 640         au1000->card = card;
 641         au1000->stream[PLAYBACK]->dma = -1;
 642         au1000->stream[CAPTURE]->dma = -1;
 643         au1000->ac97_res_port = NULL;
 644         au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
 645         au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
 646         if (au1000->stream[PLAYBACK] == NULL ||
 647             au1000->stream[CAPTURE] == NULL) {
 648                 snd_card_free(card);
 649                 return -ENOMEM;
 650         }
 651
 652         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
 653                 snd_card_free(card);
 654                 return err;
 655         }
 656
 657         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
 658                 snd_card_free(card);
 659                 return err;
 660         }
 661
 662         strcpy(card->driver, "Au1000-AC97");
 663         strcpy(card->shortname, "AMD Au1000-AC97");
 664         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
 665
 666         if ((err = snd_card_set_generic_dev(card)) < 0) {
 667                 snd_card_free(card);
 668                 return err;
 669         }
 670
 671         if ((err = snd_card_register(card)) < 0) {
 672                 snd_card_free(card);
 673                 return err;
 674         }
 675
 676         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
 677         au1000_card = card;
 678         return 0;
 679 }
 680
 681 static void __exit au1000_exit(void)
 682 {
 683         snd_card_free(au1000_card);
 684 }
 685
 686 module_init(au1000_init);
 687 module_exit(au1000_exit);
 688