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 chip_t au1000_t
  61
  62 #define PLAYBACK 0
  63 #define CAPTURE 1
  64 #define AC97_SLOT_3 0x01
  65 #define AC97_SLOT_4 0x02
  66 #define AC97_SLOT_6 0x08
  67 #define AC97_CMD_IRQ 31
  68 #define READ 0
  69 #define WRITE 1
  70 #define READ_WAIT 2
  71 #define RW_DONE 3
  72
  73 DECLARE_WAIT_QUEUE_HEAD(ac97_command_wq);
  74
  75 typedef struct au1000_period au1000_period_t;
  76 struct au1000_period
  77 {
  78         u32 start;
  79         u32 relative_end;       /*realtive to start of buffer*/
  80         au1000_period_t * next;
  81 };
  82
  83 /*Au1000 AC97 Port Control Reisters*/
  84 typedef struct au1000_ac97_reg au1000_ac97_reg_t;
  85 struct au1000_ac97_reg {
  86         u32 volatile config;
  87         u32 volatile status;
  88         u32 volatile data;
  89         u32 volatile cmd;
  90         u32 volatile cntrl;
  91 };
  92
  93 typedef struct audio_stream audio_stream_t;
  94 struct audio_stream {
  95         snd_pcm_substream_t * substream;
  96         int dma;
  97         spinlock_t dma_lock;
  98         au1000_period_t * buffer;
  99         unsigned long period_size;
 100 };
 101
 102 typedef struct snd_card_au1000 {
 103         snd_card_t *card;
 104         au1000_ac97_reg_t volatile *ac97_ioport;
 105
 106         struct resource *ac97_res_port;
 107         spinlock_t ac97_lock;
 108         ac97_t *ac97;
 109
 110         snd_pcm_t *pcm;
 111         audio_stream_t *stream[2];      /* playback & capture */
 112 } au1000_t;
 113
 114 static au1000_t *au1000 = NULL;
 115
 116 /*--------------------------- Local Functions --------------------------------*/
 117 static void
 118 au1000_set_ac97_xmit_slots(long xmit_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_XMIT_SLOTS_MASK;
 125         ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
 126         au1000->ac97_ioport->config = ac97_config;
 127         spin_unlock(&au1000->ac97_lock);
 128 }
 129
 130 static void
 131 au1000_set_ac97_recv_slots(long recv_slots)
 132 {
 133         u32 volatile ac97_config;
 134
 135         spin_lock(&au1000->ac97_lock);
 136         ac97_config = au1000->ac97_ioport->config;
 137         ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
 138         ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
 139         au1000->ac97_ioport->config = ac97_config;
 140         spin_unlock(&au1000->ac97_lock);
 141 }
 142
 143
 144 static void
 145 au1000_dma_stop(audio_stream_t *stream)
 146 {
 147         unsigned long   flags;
 148         au1000_period_t * pointer;
 149         au1000_period_t * pointer_next;
 150
 151         if (stream->buffer != NULL) {
 152                 spin_lock_irqsave(&stream->dma_lock, flags);
 153                 disable_dma(stream->dma);
 154                 spin_unlock_irqrestore(&stream->dma_lock, flags);
 155
 156                 pointer = stream->buffer;
 157                 pointer_next = stream->buffer->next;
 158
 159                 do {
 160                         kfree(pointer);
 161                         pointer = pointer_next;
 162                         pointer_next = pointer->next;
 163                 } while (pointer != stream->buffer);
 164
 165                 stream->buffer = NULL;
 166         }
 167 }
 168
 169 static void
 170 au1000_dma_start(audio_stream_t *stream)
 171 {
 172         snd_pcm_substream_t *substream = stream->substream;
 173         snd_pcm_runtime_t *runtime = substream->runtime;
 174
 175         unsigned long flags, dma_start;
 176         int i;
 177         au1000_period_t * pointer;
 178
 179         if (stream->buffer == NULL) {
 180                 dma_start = virt_to_phys(runtime->dma_area);
 181
 182                 stream->period_size = frames_to_bytes(runtime,
 183                         runtime->period_size);
 184                 stream->buffer = kmalloc(sizeof(au1000_period_t), GFP_KERNEL);
 185                 pointer = stream->buffer;
 186                 for (i = 0 ; i < runtime->periods ; i++) {
 187                         pointer->start = (u32)(dma_start +
 188                                 (i * stream->period_size));
 189                         pointer->relative_end = (u32)
 190                                 (((i+1) * stream->period_size) - 0x1);
 191                         if ( i < runtime->periods - 1) {
 192                                 pointer->next = kmalloc(sizeof(au1000_period_t)
 193                                         , GFP_KERNEL);
 194                                 pointer = pointer->next;
 195                         }
 196                 }
 197                 pointer->next = stream->buffer;
 198
 199                 spin_lock_irqsave(&stream->dma_lock, flags);
 200                 init_dma(stream->dma);
 201                 if (get_dma_active_buffer(stream->dma) == 0) {
 202                         clear_dma_done0(stream->dma);
 203                         set_dma_addr0(stream->dma, stream->buffer->start);
 204                         set_dma_count0(stream->dma, stream->period_size >> 1);
 205                         set_dma_addr1(stream->dma, stream->buffer->next->start);
 206                         set_dma_count1(stream->dma, stream->period_size >> 1);
 207                 } else {
 208                         clear_dma_done1(stream->dma);
 209                         set_dma_addr1(stream->dma, stream->buffer->start);
 210                         set_dma_count1(stream->dma, stream->period_size >> 1);
 211                         set_dma_addr0(stream->dma, stream->buffer->next->start);
 212                         set_dma_count0(stream->dma, stream->period_size >> 1);
 213                 }
 214                 enable_dma_buffers(stream->dma);
 215                 start_dma(stream->dma);
 216                 spin_unlock_irqrestore(&stream->dma_lock, flags);
 217         }
 218 }
 219
 220 static irqreturn_t
 221 au1000_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 222 {
 223         audio_stream_t *stream = (audio_stream_t *) dev_id;
 224         snd_pcm_substream_t *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                 spin_unlock(&stream->dma_lock);
 244                 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
 245                 au1000_dma_stop(stream);
 246                 au1000_dma_start(stream);
 247                 spin_lock(&stream->dma_lock);
 248                 break;
 249         case (~DMA_D0 & ~DMA_D1):
 250                 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
 251         }
 252         spin_unlock(&stream->dma_lock);
 253         snd_pcm_period_elapsed(substream);
 254         return IRQ_HANDLED;
 255 }
 256
 257 /*-------------------------- PCM Audio Streams -------------------------------*/
 258
 259 static unsigned int rates[] = {8000, 11025, 16000, 22050};
 260 static snd_pcm_hw_constraint_list_t hw_constraints_rates = {
 261         .count  =  sizeof(rates) / sizeof(rates[0]),
 262         .list   = rates,
 263         .mask   = 0,
 264 };
 265
 266 static snd_pcm_hardware_t snd_au1000 =
 267 {
 268         .info                   = (SNDRV_PCM_INFO_INTERLEAVED | \
 269                                 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
 270         .formats                = SNDRV_PCM_FMTBIT_S16_LE,
 271         .rates                  = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
 272                                 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
 273         .rate_min               = 8000,
 274         .rate_max               = 22050,
 275         .channels_min           = 1,
 276         .channels_max           = 2,
 277         .buffer_bytes_max       = 128*1024,
 278         .period_bytes_min       = 32,
 279         .period_bytes_max       = 16*1024,
 280         .periods_min            = 8,
 281         .periods_max            = 255,
 282         .fifo_size              = 16,
 283 };
 284
 285 static int
 286 snd_au1000_playback_open(snd_pcm_substream_t * substream)
 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;
 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(snd_pcm_substream_t * substream)
 298 {
 299         au1000->stream[CAPTURE]->substream = substream;
 300         au1000->stream[CAPTURE]->buffer = NULL;
 301         substream->private_data = au1000->stream[CAPTURE];
 302         substream->runtime->hw = snd_au1000;
 303         return (snd_pcm_hw_constraint_list(substream->runtime, 0,
 304                 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
 305
 306 }
 307
 308 static int
 309 snd_au1000_playback_close(snd_pcm_substream_t * substream)
 310 {
 311         au1000->stream[PLAYBACK]->substream = NULL;
 312         return 0;
 313 }
 314
 315 static int
 316 snd_au1000_capture_close(snd_pcm_substream_t * substream)
 317 {
 318         au1000->stream[CAPTURE]->substream = NULL;
 319         return 0;
 320 }
 321
 322 static int
 323 snd_au1000_hw_params(snd_pcm_substream_t * substream,
 324                                         snd_pcm_hw_params_t * hw_params)
 325 {
 326         return snd_pcm_lib_malloc_pages(substream,
 327                                         params_buffer_bytes(hw_params));
 328 }
 329
 330 static int
 331 snd_au1000_hw_free(snd_pcm_substream_t * substream)
 332 {
 333         return snd_pcm_lib_free_pages(substream);
 334 }
 335
 336 static int
 337 snd_au1000_playback_prepare(snd_pcm_substream_t * substream)
 338 {
 339         snd_pcm_runtime_t *runtime = substream->runtime;
 340
 341         if (runtime->channels == 1 )
 342                 au1000_set_ac97_xmit_slots(AC97_SLOT_4);
 343         else
 344                 au1000_set_ac97_xmit_slots(AC97_SLOT_3 | AC97_SLOT_4);
 345         snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
 346         return 0;
 347 }
 348
 349 static int
 350 snd_au1000_capture_prepare(snd_pcm_substream_t * substream)
 351 {
 352         snd_pcm_runtime_t *runtime = substream->runtime;
 353
 354         if (runtime->channels == 1 )
 355                 au1000_set_ac97_recv_slots(AC97_SLOT_4);
 356         else
 357                 au1000_set_ac97_recv_slots(AC97_SLOT_3 | AC97_SLOT_4);
 358         snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
 359         return 0;
 360 }
 361
 362 static int
 363 snd_au1000_trigger(snd_pcm_substream_t * substream, int cmd)
 364 {
 365         audio_stream_t *stream = substream->private_data;
 366         int err = 0;
 367
 368         switch (cmd) {
 369         case SNDRV_PCM_TRIGGER_START:
 370                 au1000_dma_start(stream);
 371                 break;
 372         case SNDRV_PCM_TRIGGER_STOP:
 373                 au1000_dma_stop(stream);
 374                 break;
 375         default:
 376                 err = -EINVAL;
 377                 break;
 378         }
 379         return err;
 380 }
 381
 382 static snd_pcm_uframes_t
 383 snd_au1000_pointer(snd_pcm_substream_t * substream)
 384 {
 385         audio_stream_t *stream = substream->private_data;
 386         snd_pcm_runtime_t *runtime = substream->runtime;
 387         unsigned long flags;
 388         long location;
 389
 390         spin_lock_irqsave(&stream->dma_lock, flags);
 391         location = get_dma_residue(stream->dma);
 392         spin_unlock_irqrestore(&stream->dma_lock, flags);
 393         location = stream->buffer->relative_end - location;
 394         if (location == -1)
 395                 location = 0;
 396         return bytes_to_frames(runtime,location);
 397 }
 398
 399 static snd_pcm_ops_t snd_card_au1000_playback_ops = {
 400         .open                   = snd_au1000_playback_open,
 401         .close                  = snd_au1000_playback_close,
 402         .ioctl                  = snd_pcm_lib_ioctl,
 403         .hw_params              = snd_au1000_hw_params,
 404         .hw_free                = snd_au1000_hw_free,
 405         .prepare                = snd_au1000_playback_prepare,
 406         .trigger                = snd_au1000_trigger,
 407         .pointer                = snd_au1000_pointer,
 408 };
 409
 410 static snd_pcm_ops_t snd_card_au1000_capture_ops = {
 411         .open                   = snd_au1000_capture_open,
 412         .close                  = snd_au1000_capture_close,
 413         .ioctl                  = snd_pcm_lib_ioctl,
 414         .hw_params              = snd_au1000_hw_params,
 415         .hw_free                = snd_au1000_hw_free,
 416         .prepare                = snd_au1000_capture_prepare,
 417         .trigger                = snd_au1000_trigger,
 418         .pointer                = snd_au1000_pointer,
 419 };
 420
 421 static int __devinit
 422 snd_au1000_pcm_new(void)
 423 {
 424         snd_pcm_t *pcm;
 425         int err;
 426         unsigned long flags;
 427
 428         if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
 429                 return err;
 430
 431         snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
 432                 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
 433
 434         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 435                 &snd_card_au1000_playback_ops);
 436         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 437                 &snd_card_au1000_capture_ops);
 438
 439         pcm->private_data = au1000;
 440         pcm->info_flags = 0;
 441         strcpy(pcm->name, "Au1000 AC97 PCM");
 442
 443         flags = claim_dma_lock();
 444         if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
 445                         "AC97 TX", au1000_dma_interrupt, SA_INTERRUPT,
 446                         au1000->stream[PLAYBACK])) < 0) {
 447                 release_dma_lock(flags);
 448                 return -EBUSY;
 449         }
 450         if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
 451                         "AC97 RX", au1000_dma_interrupt, SA_INTERRUPT,
 452                         au1000->stream[CAPTURE])) < 0){
 453                 release_dma_lock(flags);
 454                 return -EBUSY;
 455         }
 456         /* enable DMA coherency in read/write DMA channels */
 457         set_dma_mode(au1000->stream[PLAYBACK]->dma,
 458                      get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
 459         set_dma_mode(au1000->stream[CAPTURE]->dma,
 460                      get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
 461         release_dma_lock(flags);
 462         spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
 463         spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
 464         au1000->pcm = pcm;
 465         return 0;
 466 }
 467
 468
 469 /*-------------------------- AC97 CODEC Control ------------------------------*/
 470
 471 static unsigned short
 472 snd_au1000_ac97_read(ac97_t *ac97, unsigned short reg)
 473 {
 474         u32 volatile cmd;
 475         u16 volatile data;
 476         int             i;
 477         spin_lock(au1000->ac97_lock);
 478 /* would rather use the interupt than this polling but it works and I can't
 479 get the interupt driven case to work efficiently */
 480         for (i = 0; i < 0x5000; i++)
 481                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 482                         break;
 483         if (i == 0x5000)
 484                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 485
 486         cmd = (u32) reg & AC97C_INDEX_MASK;
 487         cmd |= AC97C_READ;
 488         au1000->ac97_ioport->cmd = cmd;
 489
 490         /* now wait for the data */
 491         for (i = 0; i < 0x5000; i++)
 492                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 493                         break;
 494         if (i == 0x5000) {
 495                 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
 496                 return 0;
 497         }
 498
 499         data = au1000->ac97_ioport->cmd & 0xffff;
 500         spin_unlock(au1000->ac97_lock);
 501
 502         return data;
 503
 504 }
 505
 506
 507 static void
 508 snd_au1000_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
 509 {
 510         u32 cmd;
 511         int i;
 512         spin_lock(au1000->ac97_lock);
 513 /* would rather use the interupt than this polling but it works and I can't
 514 get the interupt driven case to work efficiently */
 515         for (i = 0; i < 0x5000; i++)
 516                 if (!(au1000->ac97_ioport->status & AC97C_CP))
 517                         break;
 518         if (i == 0x5000)
 519                 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
 520
 521         cmd = (u32) reg & AC97C_INDEX_MASK;
 522         cmd &= ~AC97C_READ;
 523         cmd |= ((u32) val << AC97C_WD_BIT);
 524         au1000->ac97_ioport->cmd = cmd;
 525         spin_unlock(au1000->ac97_lock);
 526 }
 527 static void
 528 snd_au1000_ac97_free(ac97_t *ac97)
 529 {
 530         au1000->ac97 = NULL;
 531 }
 532
 533 static int __devinit
 534 snd_au1000_ac97_new(void)
 535 {
 536         int err;
 537
 538 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
 539         ac97_bus_t *pbus;
 540         ac97_template_t ac97;
 541         static ac97_bus_ops_t ops = {
 542                 .write = snd_au1000_ac97_write,
 543                 .read = snd_au1000_ac97_read,
 544         };
 545 #else
 546         ac97_bus_t bus, *pbus;
 547         ac97_t ac97;
 548 #endif
 549
 550         if ((au1000->ac97_res_port = request_region(AC97C_CONFIG,
 551                         sizeof(au1000_ac97_reg_t), "Au1x00 AC97")) == NULL) {
 552                 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
 553                 return -EBUSY;
 554         }
 555         au1000->ac97_ioport = (au1000_ac97_reg_t *) au1000->ac97_res_port->start;
 556
 557         spin_lock_init(&au1000->ac97_lock);
 558
 559         spin_lock(&au1000->ac97_lock);
 560
 561         /* configure pins for AC'97
 562         TODO: move to board_setup.c */
 563         au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
 564
 565         /* Initialise Au1000's AC'97 Control Block */
 566         au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
 567         udelay(10);
 568         au1000->ac97_ioport->cntrl = AC97C_CE;
 569         udelay(10);
 570
 571         /* Initialise External CODEC -- cold reset */
 572         au1000->ac97_ioport->config = AC97C_RESET;
 573         udelay(10);
 574         au1000->ac97_ioport->config = 0x0;
 575         mdelay(5);
 576
 577         spin_unlock(&au1000->ac97_lock);
 578
 579         /* Initialise AC97 middle-layer */
 580 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,8)
 581         if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 582                 return err;
 583 #else
 584         memset(&bus, 0, sizeof(bus));
 585         bus.write = snd_au1000_ac97_write;
 586         bus.read = snd_au1000_ac97_read;
 587         if ((err = snd_ac97_bus(au1000->card, &bus, &pbus)) < 0)
 588                 return err;
 589 #endif
 590         memset(&ac97, 0, sizeof(ac97));
 591         ac97.private_data = au1000;
 592         ac97.private_free = snd_au1000_ac97_free;
 593         if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
 594                 return err;
 595         return 0;
 596
 597 }
 598
 599 /*------------------------------ Setup / Destroy ----------------------------*/
 600
 601 void
 602 snd_au1000_free(snd_card_t *card)
 603 {
 604
 605         if (au1000->ac97_res_port) {
 606                 /* put internal AC97 block into reset */
 607                 au1000->ac97_ioport->cntrl = AC97C_RS;
 608                 au1000->ac97_ioport = NULL;
 609                 release_resource(au1000->ac97_res_port);
 610                 kfree_nocheck(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         au1000->stream[PLAYBACK] = NULL;
 621         kfree(au1000->stream[CAPTURE]);
 622         au1000->stream[CAPTURE] = NULL;
 623         kfree(au1000);
 624         au1000 = NULL;
 625
 626 }
 627
 628 static int __init
 629 au1000_init(void)
 630 {
 631         int err;
 632
 633         au1000 = kmalloc(sizeof(au1000_t), GFP_KERNEL);
 634         if (au1000 == NULL)
 635                 return -ENOMEM;
 636         au1000->stream[PLAYBACK] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
 637         if (au1000->stream[PLAYBACK] == NULL)
 638                 return -ENOMEM;
 639         au1000->stream[CAPTURE] = kmalloc(sizeof(audio_stream_t), GFP_KERNEL);
 640         if (au1000->stream[CAPTURE] == NULL)
 641                 return -ENOMEM;
 642         /* so that snd_au1000_free will work as intended */
 643         au1000->stream[PLAYBACK]->dma = -1;
 644         au1000->stream[CAPTURE]->dma = -1;
 645         au1000->ac97_res_port = NULL;
 646
 647         au1000->card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(au1000_t));
 648         if (au1000->card == NULL) {
 649                 snd_au1000_free(au1000->card);
 650                 return -ENOMEM;
 651         }
 652
 653         au1000->card->private_data = (au1000_t *)au1000;
 654         au1000->card->private_free = snd_au1000_free;
 655
 656         if ((err = snd_au1000_ac97_new()) < 0 ) {
 657                 snd_card_free(au1000->card);
 658                 return err;
 659         }
 660
 661         if ((err = snd_au1000_pcm_new()) < 0) {
 662                 snd_card_free(au1000->card);
 663                 return err;
 664         }
 665
 666         strcpy(au1000->card->driver, "AMD-Au1000-AC97");
 667         strcpy(au1000->card->shortname, "Au1000-AC97");
 668         sprintf(au1000->card->longname, "AMD Au1000--AC97 ALSA Driver");
 669
 670         if ((err = snd_card_register(au1000->card)) < 0) {
 671                 snd_card_free(au1000->card);
 672                 return err;
 673         }
 674
 675         printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
 676         return 0;
 677 }
 678
 679 static void __exit au1000_exit(void)
 680 {
 681         snd_card_free(au1000->card);
 682 }
 683
 684 module_init(au1000_init);
 685 module_exit(au1000_exit);
 686