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 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
  54 MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
  55 #else
  56 MODULE_CLASSES("{sound}");
  57 MODULE_DEVICES("{{AMD,Au1000 AC'97}}");
  58 #endif
  59
  60 #define PLAYBACK 0
  61 #define CAPTURE 1
  62 #define AC97_SLOT_3 0x01
  63 #define AC97_SLOT_4 0x02
  64 #define AC97_SLOT_6 0x08
  65 #define AC97_CMD_IRQ 31
  66 #define READ 0
  67 #define WRITE 1
  68 #define READ_WAIT 2
  69 #define RW_DONE 3
  70
  71 DECLARE_WAIT_QUEUE_HEAD(ac97_command_wq);
  72
  73 typedef struct au1000_period au1000_period_t;
  74 struct au1000_period
  75 {
  76         u32 start;
  77         u32 relative_end;       /*realtive to start of buffer*/
  78         au1000_period_t * next;
  79 };
  80
  81 /*Au1000 AC97 Port Control Reisters*/
  82 typedef struct au1000_ac97_reg au1000_ac97_reg_t;
  83 struct au1000_ac97_reg {
  84         u32 volatile config;
  85         u32 volatile status;
  86         u32 volatile data;
  87         u32 volatile cmd;
  88         u32 volatile cntrl;
  89 };
  90
  91 typedef struct audio_stream audio_stream_t;
  92 struct audio_stream {
  93         snd_pcm_substream_t * substream;
  94         int dma;
  95         spinlock_t dma_lock;
  96         au1000_period_t * buffer;
  97         unsigned long period_size;
  98 };
  99
 100 typedef struct snd_card_au1000 {
 101         snd_card_t *card;
 102         au1000_ac97_reg_t volatile *ac97_ioport;
 103
 104         struct resource *ac97_res_port;
 105         spinlock_t ac97_lock;
 106         ac97_t *ac97;
 107
 108         snd_pcm_t *pcm;
 109         audio_stream_t *stream[2];      /* playback & capture */
 110 } au1000_t;
 111
 112 static au1000_t *au1000 = NULL;
 113
 114 /*--------------------------- Local Functions --------------------------------*/
 115 static void
 116 au1000_set_ac97_xmit_slots(long xmit_slots)
 117 {
 118         u32 volatile ac97_config;
 119
 120         spin_lock(&au1000->ac97_lock);
 121         ac97_config = au1000->ac97_ioport->config;
 122         ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
 123         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
 124         au1000->ac97_ioport->config = ac97_config;
 125         spin_unlock(&au1000->ac97_lock);
 126 }
 127
 128 static void
 129 au1000_set_ac97_recv_slots(long recv_slots)
 130 {
 131         u32 volatile ac97_config;
 132
 133         spin_lock(&au1000->ac97_lock);
 134         ac97_config = au1000->ac97_ioport->config;
 135         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
 136         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
 137         au1000->ac97_ioport->config = ac97_config;
 138         spin_unlock(&au1000->ac97_lock);
 139 }
 140
 141
 142 static void
 143 au1000_dma_stop(audio_stream_t *stream)
 144 {
 145         unsigned long   flags;
 146         au1000_period_t * pointer;
 147         au1000_period_t * pointer_next;
 148
 149         if (stream->buffer != NULL) {
 150                 spin_lock_irqsave(&stream->dma_lock, flags);
 151                 disable_dma(stream->dma);
 152                 spin_unlock_irqrestore(&stream->dma_lock, flags);
 153
 154                 pointer = stream->buffer;
 155                 pointer_next = stream->buffer->next;
 156
 157                 do {
 158                         kfree(pointer);
 159                         pointer = pointer_next;
 160                         pointer_next = pointer->next;
 161                 } while (pointer != stream->buffer);
 162
 163                 stream->buffer = NULL;
 164         }
 165 }
 166
 167 static void
 168 au1000_dma_start(audio_stream_t *stream)
 169 {
 170         snd_pcm_substream_t *substream = stream->substream;
 171         snd_pcm_runtime_t *runtime = substream->runtime;
 172
 173         unsigned long flags, dma_start;
 174         int i;
 175         au1000_period_t * pointer;
 176
 177         if (stream->buffer == NULL) {
 178                 dma_start = virt_to_phys(runtime->dma_area);
 179
 180                 stream->period_size = frames_to_bytes(runtime,
 181                         runtime->period_size);
 182                 stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
 183                 pointer = stream->buffer;
 184                 for (i = 0 ; i < runtime->periods ; i++) {
 185                         pointer->start = (u32)(dma_start +
 186                                 (i * stream->period_size));
 187                         pointer->relative_end = (u32)
 188                                 (((i+1) * stream->period_size) - 0x1);
 189                         if ( i < runtime->periods - 1) {
 190                                 pointer->next = kmalloc(sizeof(au1000_period_t)
 191                                         , GFP_KERNEL);
 192                                 pointer = pointer->next;
 193                         }
 194                 }
 195                 pointer->next = stream->buffer;
 196
 197                 spin_lock_irqsave(&stream->dma_lock, flags);
 198                 init_dma(stream->dma);
 199                 if (get_dma_active_buffer(stream->dma) == 0) {
 200                         clear_dma_done0(stream->dma);
 201                         set_dma_addr0(stream->dma, stream->buffer->start);
 202                         set_dma_count0(stream->dma, stream->period_size >> 1);
 203                         set_dma_addr1(stream->dma, stream->buffer->next->start);
 204                         set_dma_count1(stream->dma, stream->period_size >> 1);
 205                 } else {
 206                         clear_dma_done1(stream->dma);
 207                         set_dma_addr1(stream->dma, stream->buffer->start);
 208                         set_dma_count1(stream->dma, stream->period_size >> 1);
 209                         set_dma_addr0(stream->dma, stream->buffer->next->start);
 210                         set_dma_count0(stream->dma, stream->period_size >> 1);
 211                 }
 212                 enable_dma_buffers(stream->dma);
 213                 start_dma(stream->dma);
 214                 spin_unlock_irqrestore(&stream->dma_lock, flags);
 215         }
 216 }
 217
 218 static irqreturn_t
 219 au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 220 {
 221         audio_stream_t *stream = (audio_stream_t *) dev_id;
 222         snd_pcm_substream_t *substream = stream->substream;
 223
 224         spin_lock(&stream->dma_lock);
 225         switch (get_dma_buffer_done(stream->dma)) {
 226         case DMA_D0:
 227                 stream->buffer = stream->buffer->next;
 228                 clear_dma_done0(stream->dma);
 229                 set_dma_addr0(stream->dma, stream->buffer->next->start);
 230                 set_dma_count0(stream->dma, stream->period_size >> 1);
 231                 enable_dma_buffer0(stream->dma);
 232                 break;
 233         case DMA_D1:
 234                 stream->buffer = stream->buffer->next;
 235                 clear_dma_done1(stream->dma);
 236                 set_dma_addr1(stream->dma, stream->buffer->next->start);
 237                 set_dma_count1(stream->dma, stream->period_size >> 1);
 238                 enable_dma_buffer1(stream->dma);
 239                 break;
 240         case (DMA_D0 | DMA_D1):
 241                 spin_unlock(&stream->dma_lock);
 242                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
 243                 au1000_dma_stop(stream);
 244                 au1000_dma_start(stream);
 245                 spin_lock(&stream->dma_lock);
 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 snd_pcm_hw_constraint_list_t hw_constraints_rates = {
 259         .count  =  sizeof(rates) / sizeof(rates[0]),
 260         .list   = rates,
 261         .mask   = 0,
 262 };
 263
 264 static snd_pcm_hardware_t snd_au1000 =
 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(snd_pcm_substream_t * substream)
 285 {
 286         au1000->stream[PLAYBACK]->substream = substream;
 287         au1000->stream[PLAYBACK]->buffer = NULL;
 288         substream->private_data = au1000->stream[PLAYBACK];
 289         substream->runtime->hw = snd_au1000;
 290         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 291                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 292 }
 293
 294 static int
 295 snd_au1000_capture_open(snd_pcm_substream_t * substream)
 296 {
 297         au1000->stream[CAPTURE]->substream = substream;
 298         au1000->stream[CAPTURE]->buffer = NULL;
 299         substream->private_data = au1000->stream[CAPTURE];
 300         substream->runtime->hw = snd_au1000;
 301         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 302                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 303
 304 }
 305
 306 static int
 307 snd_au1000_playback_close(snd_pcm_substream_t * substream)
 308 {
 309         au1000->stream[PLAYBACK]->substream = NULL;
 310         return 0;
 311 }
 312
 313 static int
 314 snd_au1000_capture_close(snd_pcm_substream_t * substream)
 315 {
 316         au1000->stream[CAPTURE]->substream = NULL;
 317         return 0;
 318 }
 319
 320 static int
 321 snd_au1000_hw_params(snd_pcm_substream_t * substream,
 322                                         snd_pcm_hw_params_t * hw_params)
 323 {
 324         return snd_pcm_lib_malloc_pages(substream,
 325                                         params_buffer_bytes(hw_params));
 326 }
 327
 328 static int
 329 snd_au1000_hw_free(snd_pcm_substream_t * substream)
 330 {
 331         return snd_pcm_lib_free_pages(substream);
 332 }
 333
 334 static int
 335 snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
 336 {
 337         snd_pcm_runtime_t *runtime = substream->runtime;
 338
 339         if (runtime->channels == 1 )
 340                 au1000_set_ac97_xmit_slots(AC97_SLOT_4);
 341         else
 342                 au1000_set_ac97_xmit_slots(AC97_SLOT_3 | AC97_SLOT_4);
 343         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 344         return 0;
 345 }
 346
 347 static int
 348 snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
 349 {
 350         snd_pcm_runtime_t *runtime = substream->runtime;
 351
 352         if (runtime->channels == 1 )
 353                 au1000_set_ac97_recv_slots(AC97_SLOT_4);
 354         else
 355                 au1000_set_ac97_recv_slots(AC97_SLOT_3 | AC97_SLOT_4);
 356         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 357         return 0;
 358 }
 359
 360 static int
 361 snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
 362 {
 363         audio_stream_t *stream = substream->private_data;
 364         int err = 0;
 365
 366         switch (cmd) {
 367         case SNDRV_PCM_TRIGGER_START:
 368                 au1000_dma_start(stream);
 369                 break;
 370         case SNDRV_PCM_TRIGGER_STOP:
 371                 au1000_dma_stop(stream);
 372                 break;
 373         default:
 374                 err = -EINVAL;
 375                 break;
 376         }
 377         return err;
 378 }
 379
 380 static snd_pcm_uframes_t
 381 snd_au1000_pointer(snd_pcm_substream_t * substream)
 382 {
 383         audio_stream_t *stream = substream->private_data;
 384         snd_pcm_runtime_t *runtime = substream->runtime;
 385         unsigned long flags;
 386         long location;
 387
 388         spin_lock_irqsave(&stream->dma_lock, flags);
 389         location = get_dma_residue(stream->dma);
 390         spin_unlock_irqrestore(&stream->dma_lock, flags);
 391         location = stream->buffer->relative_end - location;
 392         if (location == -1)
 393                 location = 0;
 394         return bytes_to_frames(runtime,location);
 395 }
 396
 397 static snd_pcm_ops_t snd_card_au1000_playback_ops = {
 398         .open                   = snd_au1000_playback_open,
 399         .close                  = snd_au1000_playback_close,
 400         .ioctl                  = snd_pcm_lib_ioctl,
 401         .hw_params              = snd_au1000_hw_params,
 402         .hw_free                = snd_au1000_hw_free,
 403         .prepare                = snd_au1000_playback_prepare,
 404         .trigger                = snd_au1000_trigger,
 405         .pointer                = snd_au1000_pointer,
 406 };
 407
 408 static snd_pcm_ops_t snd_card_au1000_capture_ops = {
 409         .open                   = snd_au1000_capture_open,
 410         .close                  = snd_au1000_capture_close,
 411         .ioctl                  = snd_pcm_lib_ioctl,
 412         .hw_params              = snd_au1000_hw_params,
 413         .hw_free                = snd_au1000_hw_free,
 414         .prepare                = snd_au1000_capture_prepare,
 415         .trigger                = snd_au1000_trigger,
 416         .pointer                = snd_au1000_pointer,
 417 };
 418
 419 static int __devinit
 420 snd_au1000_pcm_new(void)
 421 {
 422         snd_pcm_t *pcm;
 423         int err;
 424         unsigned long flags;
 425
 426         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
 427                 return err;
 428
 429         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 430                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
 431
 432         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 433                 &snd_card_au1000_playback_ops);
 434         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 435                 &snd_card_au1000_capture_ops);
 436
 437         pcm->private_data = au1000;
 438         pcm->info_flags = 0;
 439         strcpy(pcm->name, "Au1000 AC97 PCM");
 440
 441         flags = claim_dma_lock();
 442         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 443                         "AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
 444                         au1000->stream[PLAYBACK])) < 0) {
 445                 release_dma_lock(flags);
 446                 return -EBUSY;
 447         }
 448         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
 449                         "AC97 RX", au1000_dma_interrupt, SA_INTERRUPT,
 450                         au1000->stream[CAPTURE])) < 0){
 451                 release_dma_lock(flags);
 452                 return -EBUSY;
 453         }
 454         /* enable DMA coherency in read/write DMA channels */
 455         set_dma_mode(au1000->stream[PLAYBACK]->dma,
 456                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
 457         set_dma_mode(au1000->stream[CAPTURE]->dma,
 458                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 459         release_dma_lock(flags);
 460         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
 461         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 462         au1000->pcm = pcm;
 463         return 0;
 464 }
 465
 466
 467 /*-------------------------- AC97 CODEC Control ------------------------------*/
 468
 469 static unsigned short
 470 snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
 471 {
 472         u32 volatile cmd;
 473         u16 volatile data;
 474         int             i;
 475         spin_lock(&au1000->ac97_lock);
 476 /* would rather use the interupt than this polling but it works and I can't
 477 get the interupt driven case to work efficiently */
 478         for (i = 0; i < 0x5000; i++)
 479                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 480                         break;
 481         if (i == 0x5000)
 482                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 483
 484         cmd = (u32) reg & AC97C_INDEX_MASK;
 485         cmd |= AC97C_READ;
 486         au1000->ac97_ioport->cmd = cmd;
 487
 488         /* now wait for the data */
 489         for (i = 0; i < 0x5000; i++)
 490                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 491                         break;
 492         if (i == 0x5000) {
 493                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 494                 return 0;
 495         }
 496
 497         data = au1000->ac97_ioport->cmd & 0xffff;
 498         spin_unlock(&au1000->ac97_lock);
 499
 500         return data;
 501
 502 }
 503
 504
 505 static void
 506 snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
 507 {
 508         u32 cmd;
 509         int i;
 510         spin_lock(&au1000->ac97_lock);
 511 /* would rather use the interupt than this polling but it works and I can't
 512 get the interupt driven case to work efficiently */
 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 write timeout\n");
 518
 519         cmd = (u32) reg & AC97C_INDEX_MASK;
 520         cmd &= ~AC97C_READ;
 521         cmd |= ((u32) val << AC97C_WD_BIT);
 522         au1000->ac97_ioport->cmd = cmd;
 523         spin_unlock(&au1000->ac97_lock);
 524 }
 525 static void
 526 snd_au1000_ac97_free(ac97_t *ac97)
 527 {
 528         au1000->ac97 = NULL;
 529 }
 530
 531 static int __devinit
 532 snd_au1000_ac97_new(void)
 533 {
 534         int err;
 535
 536 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
 537         ac97_bus_t *pbus;
 538         ac97_template_t ac97;
 539         static ac97_bus_ops_t ops = {
 540                 .write = snd_au1000_ac97_write,
 541                 .read = snd_au1000_ac97_read,
 542         };
 543 #else
 544         ac97_bus_t bus, *pbus;
 545         ac97_t ac97;
 546 #endif
 547
 548         if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
 549                         sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
 550                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
 551                 return -EBUSY;
 552         }
 553         au1000->ac97_ioport = (au1000_ac97_reg_t *) au1000->ac97_res_port->start;
 554
 555         spin_lock_init(&au1000->ac97_lock);
 556
 557         spin_lock(&au1000->ac97_lock);
 558
 559         /* configure pins for AC'97
 560         TODO: move to board_setup.c */
 561         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
 562
 563         /* Initialise Au1000's AC'97 Control Block */
 564         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
 565         udelay(10);
 566         au1000->ac97_ioport->cntrl = AC97C_CE;
 567         udelay(10);
 568
 569         /* Initialise External CODEC -- cold reset */
 570         au1000->ac97_ioport->config = AC97C_RESET;
 571         udelay(10);
 572         au1000->ac97_ioport->config = 0x0;
 573         mdelay(5);
 574
 575         spin_unlock(&au1000->ac97_lock);
 576
 577         /* Initialise AC97 middle-layer */
 578 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
 579         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 580                 return err;
 581 #else
 582         memset(&bus, 0, sizeof(bus));
 583         bus.write = snd_au1000_ac97_write;
 584         bus.read = snd_au1000_ac97_read;
 585         if ((err = snd_ac97_bus(au1000->card, &bus, &pbus)) < 0)
 586                 return err;
 587 #endif
 588         memset(&ac97, 0, sizeof(ac97));
 589         ac97.private_data = au1000;
 590         ac97.private_free = snd_au1000_ac97_free;
 591         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 592                 return err;
 593         return 0;
 594
 595 }
 596
 597 /*------------------------------ Setup / Destroy ----------------------------*/
 598
 599 void
 600 snd_au1000_free(snd_card_t *card)
 601 {
 602
 603         if (au1000->ac97_res_port) {
 604                 /* put internal AC97 block into reset */
 605                 au1000->ac97_ioport->cntrl = AC97C_RS;
 606                 au1000->ac97_ioport = NULL;
 607                 release_and_free_resource(au1000->ac97_res_port);
 608         }
 609
 610         if (au1000->stream[PLAYBACK]->dma >= 0)
 611                 free_au1000_dma(au1000->stream[PLAYBACK]->dma);
 612
 613         if (au1000->stream[CAPTURE]->dma >= 0)
 614                 free_au1000_dma(au1000->stream[CAPTURE]->dma);
 615
 616         kfree(au1000->stream[PLAYBACK]);
 617         au1000->stream[PLAYBACK] = NULL;
 618         kfree(au1000->stream[CAPTURE]);
 619         au1000->stream[CAPTURE] = NULL;
 620         kfree(au1000);
 621         au1000 = NULL;
 622
 623 }
 624
 625 static int __init
 626 au1000_init(void)
 627 {
 628         int err;
 629
 630         au1000 = kmalloc(sizeof(au1000_t), GFP_KERNEL);
 631         if (au1000 == NULL)
 632                 return -ENOMEM;
 633         au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
 634         if (au1000->stream[PLAYBACK] == NULL)
 635                 return -ENOMEM;
 636         au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
 637         if (au1000->stream[CAPTURE] == NULL)
 638                 return -ENOMEM;
 639         /* so that snd_au1000_free will work as intended */
 640         au1000->stream[PLAYBACK]->dma = -1;
 641         au1000->stream[CAPTURE]->dma = -1;
 642         au1000->ac97_res_port = NULL;
 643
 644         au1000->card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
 645         if (au1000->card == NULL) {
 646                 snd_au1000_free(au1000->card);
 647                 return -ENOMEM;
 648         }
 649
 650         au1000->card->private_data = (au1000_t *)au1000;
 651         au1000->card->private_free = snd_au1000_free;
 652
 653         if ((err = snd_au1000_ac97_new()) < 0 ) {
 654                 snd_card_free(au1000->card);
 655                 return err;
 656         }
 657
 658         if ((err = snd_au1000_pcm_new()) < 0) {
 659                 snd_card_free(au1000->card);
 660                 return err;
 661         }
 662
 663         strcpy(au1000->card->driver, "AMD-Au1000-AC97");
 664         strcpy(au1000->card->shortname, "Au1000-AC97");
 665         sprintf(au1000->card->longname, "AMD Au1000--AC97 ALSA Driver");
 666
 667         if ((err = snd_card_set_generic_dev(au1000->card)) < 0) {
 668                 snd_card_free(au1000->card);
 669                 return err;
 670         }
 671
 672         if ((err = snd_card_register(au1000->card)) < 0) {
 673                 snd_card_free(au1000->card);
 674                 return err;
 675         }
 676
 677         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
 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