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 <linux/version.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         snd_assert(stream->buffer, return);
 195         disable_dma(stream->dma);
 196 }
 197
 198 static void
 199 au1000_dma_start(struct audio_stream *stream)
 200 {
 201         snd_assert(stream->buffer, return);
 202
 203         init_dma(stream->dma);
 204         if (get_dma_active_buffer(stream->dma) == 0) {
 205                 clear_dma_done0(stream->dma);
 206                 set_dma_addr0(stream->dma, stream->buffer->start);
 207                 set_dma_count0(stream->dma, stream->period_size >> 1);
 208                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 209                 set_dma_count1(stream->dma, stream->period_size >> 1);
 210         } else {
 211                 clear_dma_done1(stream->dma);
 212                 set_dma_addr1(stream->dma, stream->buffer->start);
 213                 set_dma_count1(stream->dma, stream->period_size >> 1);
 214                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 215                 set_dma_count0(stream->dma, stream->period_size >> 1);
 216         }
 217         enable_dma_buffers(stream->dma);
 218         start_dma(stream->dma);
 219 }
 220
 221 static irqreturn_t
 222 au1000_dma_interrupt(int irq, void *dev_id)
 223 {
 224         struct audio_stream *stream = (struct audio_stream *) dev_id;
 225         struct snd_pcm_substream *substream = stream->substream;
 226
 227         spin_lock(&stream->dma_lock);
 228         switch (get_dma_buffer_done(stream->dma)) {
 229         case DMA_D0:
 230                 stream->buffer = stream->buffer->next;
 231                 clear_dma_done0(stream->dma);
 232                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 233                 set_dma_count0(stream->dma, stream->period_size >> 1);
 234                 enable_dma_buffer0(stream->dma);
 235                 break;
 236         case DMA_D1:
 237                 stream->buffer = stream->buffer->next;
 238                 clear_dma_done1(stream->dma);
 239                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 240                 set_dma_count1(stream->dma, stream->period_size >> 1);
 241                 enable_dma_buffer1(stream->dma);
 242                 break;
 243         case (DMA_D0 | DMA_D1):
 244                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
 245                 au1000_dma_stop(stream);
 246                 au1000_dma_start(stream);
 247                 break;
 248         case (~DMA_D0 & ~DMA_D1):
 249                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
 250         }
 251         spin_unlock(&stream->dma_lock);
 252         snd_pcm_period_elapsed(substream);
 253         return IRQ_HANDLED;
 254 }
 255
 256 /*-------------------------- PCM Audio Streams -------------------------------*/
 257
 258 static unsigned int rates[] = {8000, 11025, 16000, 22050};
 259 static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
 260         .count  = ARRAY_SIZE(rates),
 261         .list   = rates,
 262         .mask   = 0,
 263 };
 264
 265 static struct snd_pcm_hardware snd_au1000_hw =
 266 {
 267         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
 268                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
 269         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 270         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
 271                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
 272         .rate_min               = 8000,
 273         .rate_max               = 22050,
 274         .channels_min           = 1,
 275         .channels_max           = 2,
 276         .buffer_bytes_max       = 128*1024,
 277         .period_bytes_min       = 32,
 278         .period_bytes_max       = 16*1024,
 279         .periods_min            = 8,
 280         .periods_max            = 255,
 281         .fifo_size              = 16,
 282 };
 283
 284 static int
 285 snd_au1000_playback_open(struct snd_pcm_substream *substream)
 286 {
 287         struct snd_au1000 *au1000 = substream->pcm->private_data;
 288
 289         au1000->stream[PLAYBACK]->substream = substream;
 290         au1000->stream[PLAYBACK]->buffer = NULL;
 291         substream->private_data = au1000->stream[PLAYBACK];
 292         substream->runtime->hw = snd_au1000_hw;
 293         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 294                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 295 }
 296
 297 static int
 298 snd_au1000_capture_open(struct snd_pcm_substream *substream)
 299 {
 300         struct snd_au1000 *au1000 = substream->pcm->private_data;
 301
 302         au1000->stream[CAPTURE]->substream = substream;
 303         au1000->stream[CAPTURE]->buffer = NULL;
 304         substream->private_data = au1000->stream[CAPTURE];
 305         substream->runtime->hw = snd_au1000_hw;
 306         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 307                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 308 }
 309
 310 static int
 311 snd_au1000_playback_close(struct snd_pcm_substream *substream)
 312 {
 313         struct snd_au1000 *au1000 = substream->pcm->private_data;
 314
 315         au1000->stream[PLAYBACK]->substream = NULL;
 316         return 0;
 317 }
 318
 319 static int
 320 snd_au1000_capture_close(struct snd_pcm_substream *substream)
 321 {
 322         struct snd_au1000 *au1000 = substream->pcm->private_data;
 323
 324         au1000->stream[CAPTURE]->substream = NULL;
 325         return 0;
 326 }
 327
 328 static int
 329 snd_au1000_hw_params(struct snd_pcm_substream *substream,
 330                                         struct snd_pcm_hw_params *hw_params)
 331 {
 332         struct audio_stream *stream = substream->private_data;
 333         int err;
 334
 335         err = snd_pcm_lib_malloc_pages(substream,
 336                                        params_buffer_bytes(hw_params));
 337         if (err < 0)
 338                 return err;
 339         return au1000_setup_dma_link(stream,
 340                                      params_period_bytes(hw_params),
 341                                      params_periods(hw_params));
 342 }
 343
 344 static int
 345 snd_au1000_hw_free(struct snd_pcm_substream *substream)
 346 {
 347         struct audio_stream *stream = substream->private_data;
 348         au1000_release_dma_link(stream);
 349         return snd_pcm_lib_free_pages(substream);
 350 }
 351
 352 static int
 353 snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
 354 {
 355         struct snd_au1000 *au1000 = substream->pcm->private_data;
 356         struct snd_pcm_runtime *runtime = substream->runtime;
 357
 358         if (runtime->channels == 1)
 359                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
 360         else
 361                 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 362         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 363         return 0;
 364 }
 365
 366 static int
 367 snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
 368 {
 369         struct snd_au1000 *au1000 = substream->pcm->private_data;
 370         struct snd_pcm_runtime *runtime = substream->runtime;
 371
 372         if (runtime->channels == 1)
 373                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
 374         else
 375                 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
 376         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 377         return 0;
 378 }
 379
 380 static int
 381 snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
 382 {
 383         struct audio_stream *stream = substream->private_data;
 384         int err = 0;
 385
 386         spin_lock(&stream->dma_lock);
 387         switch (cmd) {
 388         case SNDRV_PCM_TRIGGER_START:
 389                 au1000_dma_start(stream);
 390                 break;
 391         case SNDRV_PCM_TRIGGER_STOP:
 392                 au1000_dma_stop(stream);
 393                 break;
 394         default:
 395                 err = -EINVAL;
 396                 break;
 397         }
 398         spin_unlock(&stream->dma_lock);
 399         return err;
 400 }
 401
 402 static snd_pcm_uframes_t
 403 snd_au1000_pointer(struct snd_pcm_substream *substream)
 404 {
 405         struct audio_stream *stream = substream->private_data;
 406         struct snd_pcm_runtime *runtime = substream->runtime;
 407         long location;
 408
 409         spin_lock(&stream->dma_lock);
 410         location = get_dma_residue(stream->dma);
 411         spin_unlock(&stream->dma_lock);
 412         location = stream->buffer->relative_end - location;
 413         if (location == -1)
 414                 location = 0;
 415         return bytes_to_frames(runtime,location);
 416 }
 417
 418 static struct snd_pcm_ops snd_card_au1000_playback_ops = {
 419         .open                   = snd_au1000_playback_open,
 420         .close                  = snd_au1000_playback_close,
 421         .ioctl                  = snd_pcm_lib_ioctl,
 422         .hw_params              = snd_au1000_hw_params,
 423         .hw_free                = snd_au1000_hw_free,
 424         .prepare                = snd_au1000_playback_prepare,
 425         .trigger                = snd_au1000_trigger,
 426         .pointer                = snd_au1000_pointer,
 427 };
 428
 429 static struct snd_pcm_ops snd_card_au1000_capture_ops = {
 430         .open                   = snd_au1000_capture_open,
 431         .close                  = snd_au1000_capture_close,
 432         .ioctl                  = snd_pcm_lib_ioctl,
 433         .hw_params              = snd_au1000_hw_params,
 434         .hw_free                = snd_au1000_hw_free,
 435         .prepare                = snd_au1000_capture_prepare,
 436         .trigger                = snd_au1000_trigger,
 437         .pointer                = snd_au1000_pointer,
 438 };
 439
 440 static int __devinit
 441 snd_au1000_pcm_new(struct snd_au1000 *au1000)
 442 {
 443         struct snd_pcm *pcm;
 444         int err;
 445         unsigned long flags;
 446
 447         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
 448                 return err;
 449
 450         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 451                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
 452
 453         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 454                 &snd_card_au1000_playback_ops);
 455         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 456                 &snd_card_au1000_capture_ops);
 457
 458         pcm->private_data = au1000;
 459         pcm->info_flags = 0;
 460         strcpy(pcm->name, "Au1000 AC97 PCM");
 461
 462         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
 463         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 464
 465         flags = claim_dma_lock();
 466         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 467                         "AC97 TX", au1000_dma_interrupt, IRQF_DISABLED,
 468                         au1000->stream[PLAYBACK])) < 0) {
 469                 release_dma_lock(flags);
 470                 return -EBUSY;
 471         }
 472         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
 473                         "AC97 RX", au1000_dma_interrupt, IRQF_DISABLED,
 474                         au1000->stream[CAPTURE])) < 0){
 475                 release_dma_lock(flags);
 476                 return -EBUSY;
 477         }
 478         /* enable DMA coherency in read/write DMA channels */
 479         set_dma_mode(au1000->stream[PLAYBACK]->dma,
 480                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
 481         set_dma_mode(au1000->stream[CAPTURE]->dma,
 482                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 483         release_dma_lock(flags);
 484         au1000->pcm = pcm;
 485         return 0;
 486 }
 487
 488
 489 /*-------------------------- AC97 CODEC Control ------------------------------*/
 490
 491 static unsigned short
 492 snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
 493 {
 494         struct snd_au1000 *au1000 = ac97->private_data;
 495         u32 volatile cmd;
 496         u16 volatile data;
 497         int             i;
 498
 499         spin_lock(&au1000->ac97_lock);
 500 /* would rather use the interrupt than this polling but it works and I can't
 501 get the interrupt driven case to work efficiently */
 502         for (i = 0; i < 0x5000; i++)
 503                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 504                         break;
 505         if (i == 0x5000)
 506                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 507
 508         cmd = (u32) reg & AC97C_INDEX_MASK;
 509         cmd |= AC97C_READ;
 510         au1000->ac97_ioport->cmd = cmd;
 511
 512         /* now wait for the data */
 513         for (i = 0; i < 0x5000; i++)
 514                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 515                         break;
 516         if (i == 0x5000) {
 517                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 518                 return 0;
 519         }
 520
 521         data = au1000->ac97_ioport->cmd & 0xffff;
 522         spin_unlock(&au1000->ac97_lock);
 523
 524         return data;
 525
 526 }
 527
 528
 529 static void
 530 snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
 531 {
 532         struct snd_au1000 *au1000 = ac97->private_data;
 533         u32 cmd;
 534         int i;
 535
 536         spin_lock(&au1000->ac97_lock);
 537 /* would rather use the interrupt than this polling but it works and I can't
 538 get the interrupt driven case to work efficiently */
 539         for (i = 0; i < 0x5000; i++)
 540                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 541                         break;
 542         if (i == 0x5000)
 543                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
 544
 545         cmd = (u32) reg & AC97C_INDEX_MASK;
 546         cmd &= ~AC97C_READ;
 547         cmd |= ((u32) val << AC97C_WD_BIT);
 548         au1000->ac97_ioport->cmd = cmd;
 549         spin_unlock(&au1000->ac97_lock);
 550 }
 551
 552 static int __devinit
 553 snd_au1000_ac97_new(struct snd_au1000 *au1000)
 554 {
 555         int err;
 556         struct snd_ac97_bus *pbus;
 557         struct snd_ac97_template ac97;
 558         static struct snd_ac97_bus_ops ops = {
 559                 .write = snd_au1000_ac97_write,
 560                 .read = snd_au1000_ac97_read,
 561         };
 562
 563         if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
 564                         0x100000, "Au1x00 AC97")) == NULL) {
 565                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
 566                 return -EBUSY;
 567         }
 568         au1000->ac97_ioport = (struct au1000_ac97_reg *)
 569                 KSEG1ADDR(au1000->ac97_res_port->start);
 570
 571         spin_lock_init(&au1000->ac97_lock);
 572
 573         /* configure pins for AC'97
 574         TODO: move to board_setup.c */
 575         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
 576
 577         /* Initialise Au1000's AC'97 Control Block */
 578         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
 579         udelay(10);
 580         au1000->ac97_ioport->cntrl = AC97C_CE;
 581         udelay(10);
 582
 583         /* Initialise External CODEC -- cold reset */
 584         au1000->ac97_ioport->config = AC97C_RESET;
 585         udelay(10);
 586         au1000->ac97_ioport->config = 0x0;
 587         mdelay(5);
 588
 589         /* Initialise AC97 middle-layer */
 590         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 591                 return err;
 592
 593         memset(&ac97, 0, sizeof(ac97));
 594         ac97.private_data = au1000;
 595         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 596                 return err;
 597
 598         return 0;
 599 }
 600
 601 /*------------------------------ Setup / Destroy ----------------------------*/
 602
 603 void
 604 snd_au1000_free(struct snd_card *card)
 605 {
 606         struct snd_au1000 *au1000 = card->private_data;
 607
 608         if (au1000->ac97_res_port) {
 609                 /* put internal AC97 block into reset */
 610                 au1000->ac97_ioport->cntrl = AC97C_RS;
 611                 au1000->ac97_ioport = NULL;
 612                 release_and_free_resource(au1000->ac97_res_port);
 613         }
 614
 615         if (au1000->stream[PLAYBACK]) {
 616                 if (au1000->stream[PLAYBACK]->dma >= 0)
 617                         free_au1000_dma(au1000->stream[PLAYBACK]->dma);
 618                 kfree(au1000->stream[PLAYBACK]);
 619         }
 620
 621         if (au1000->stream[CAPTURE]) {
 622                 if (au1000->stream[CAPTURE]->dma >= 0)
 623                         free_au1000_dma(au1000->stream[CAPTURE]->dma);
 624                 kfree(au1000->stream[CAPTURE]);
 625         }
 626 }
 627
 628
 629 static struct snd_card *au1000_card;
 630
 631 static int __init
 632 au1000_init(void)
 633 {
 634         int err;
 635         struct snd_card *card;
 636         struct snd_au1000 *au1000;
 637
 638         card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(struct snd_au1000));
 639         if (card == NULL)
 640                 return -ENOMEM;
 641
 642         card->private_free = snd_au1000_free;
 643         au1000 = card->private_data;
 644         au1000->card = card;
 645
 646         au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 647         au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
 648         /* so that snd_au1000_free will work as intended */
 649         au1000->ac97_res_port = NULL;
 650         if (au1000->stream[PLAYBACK])
 651                 au1000->stream[PLAYBACK]->dma = -1;
 652         if (au1000->stream[CAPTURE ])
 653                 au1000->stream[CAPTURE ]->dma = -1;
 654
 655         if (au1000->stream[PLAYBACK] == NULL ||
 656             au1000->stream[CAPTURE ] == NULL) {
 657                 snd_card_free(card);
 658                 return -ENOMEM;
 659         }
 660
 661         if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
 662                 snd_card_free(card);
 663                 return err;
 664         }
 665
 666         if ((err = snd_au1000_pcm_new(au1000)) < 0) {
 667                 snd_card_free(card);
 668                 return err;
 669         }
 670
 671         strcpy(card->driver, "Au1000-AC97");
 672         strcpy(card->shortname, "AMD Au1000-AC97");
 673         sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
 674
 675         if ((err = snd_card_register(card)) < 0) {
 676                 snd_card_free(card);
 677                 return err;
 678         }
 679
 680         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
 681         au1000_card = card;
 682         return 0;
 683 }
 684
 685 static void __exit au1000_exit(void)
 686 {
 687         snd_card_free(au1000_card);
 688 }
 689
 690 module_init(au1000_init);
 691 module_exit(au1000_exit);
 692