sys/dev/sound/pci/via82c686.c

   1 /*
   2  * Copyright (c) 2000 David Jones <dej@ox.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/dev/sound/pci/via82c686.c,v 1.4.2.10 2003/05/11 01:45:53 orion Exp $
  27  * $DragonFly: src/sys/dev/sound/pci/via82c686.c,v 1.6 2006/12/20 18:14:40 dillon Exp $
  28  */
  29
  30 #include <dev/sound/pcm/sound.h>
  31 #include <dev/sound/pcm/ac97.h>
  32
  33 #include <bus/pci/pcireg.h>
  34 #include <bus/pci/pcivar.h>
  35 #include <sys/sysctl.h>
  36
  37 #include <dev/sound/pci/via82c686.h>
  38
  39 SND_DECLARE_FILE("$DragonFly: src/sys/dev/sound/pci/via82c686.c,v 1.6 2006/12/20 18:14:40 dillon Exp $");
  40
  41 #define VIA_PCI_ID 0x30581106
  42 #define NSEGS           4       /* Number of segments in SGD table */
  43
  44 #define SEGS_PER_CHAN   (NSEGS/2)
  45
  46 #define TIMEOUT 50
  47 #define VIA_DEFAULT_BUFSZ       0x1000
  48
  49 #undef DEB
  50 #define DEB(x)
  51
  52 /* we rely on this struct being packed to 64 bits */
  53 struct via_dma_op {
  54         u_int32_t ptr;
  55         u_int32_t flags;
  56 #define VIA_DMAOP_EOL         0x80000000
  57 #define VIA_DMAOP_FLAG        0x40000000
  58 #define VIA_DMAOP_STOP        0x20000000
  59 #define VIA_DMAOP_COUNT(x)    ((x)&0x00FFFFFF)
  60 };
  61
  62 struct via_info;
  63
  64 struct via_chinfo {
  65         struct via_info *parent;
  66         struct pcm_channel *channel;
  67         struct snd_dbuf *buffer;
  68         struct via_dma_op *sgd_table;
  69         int dir, blksz;
  70         int base, count, mode, ctrl;
  71 };
  72
  73 struct via_info {
  74         bus_space_tag_t st;
  75         bus_space_handle_t sh;
  76         bus_dma_tag_t parent_dmat;
  77         bus_dma_tag_t sgd_dmat;
  78         bus_dmamap_t sgd_dmamap;
  79
  80         struct resource *reg, *irq;
  81         int regid, irqid;
  82         void *ih;
  83         struct ac97_info *codec;
  84
  85         unsigned int bufsz;
  86
  87         struct via_chinfo pch, rch;
  88         struct via_dma_op *sgd_table;
  89         u_int16_t codec_caps;
  90 };
  91
  92 static u_int32_t via_fmt[] = {
  93         AFMT_U8,
  94         AFMT_STEREO | AFMT_U8,
  95         AFMT_S16_LE,
  96         AFMT_STEREO | AFMT_S16_LE,
  97         0
  98 };
  99 static struct pcmchan_caps via_vracaps = {4000, 48000, via_fmt, 0};
 100 static struct pcmchan_caps via_caps = {48000, 48000, via_fmt, 0};
 101
 102 static u_int32_t
 103 via_rd(struct via_info *via, int regno, int size)
 104 {
 105
 106         switch (size) {
 107         case 1:
 108                 return bus_space_read_1(via->st, via->sh, regno);
 109         case 2:
 110                 return bus_space_read_2(via->st, via->sh, regno);
 111         case 4:
 112                 return bus_space_read_4(via->st, via->sh, regno);
 113         default:
 114                 return 0xFFFFFFFF;
 115         }
 116 }
 117
 118
 119 static void
 120 via_wr(struct via_info *via, int regno, u_int32_t data, int size)
 121 {
 122
 123         switch (size) {
 124         case 1:
 125                 bus_space_write_1(via->st, via->sh, regno, data);
 126                 break;
 127         case 2:
 128                 bus_space_write_2(via->st, via->sh, regno, data);
 129                 break;
 130         case 4:
 131                 bus_space_write_4(via->st, via->sh, regno, data);
 132                 break;
 133         }
 134 }
 135
 136 /* -------------------------------------------------------------------- */
 137 /* Codec interface */
 138
 139 static int
 140 via_waitready_codec(struct via_info *via)
 141 {
 142         int i;
 143
 144         /* poll until codec not busy */
 145         for (i = 0; (i < TIMEOUT) &&
 146             (via_rd(via, VIA_CODEC_CTL, 4) & VIA_CODEC_BUSY); i++)
 147                 DELAY(1);
 148         if (i >= TIMEOUT) {
 149                 printf("via: codec busy\n");
 150                 return 1;
 151         }
 152
 153         return 0;
 154 }
 155
 156
 157 static int
 158 via_waitvalid_codec(struct via_info *via)
 159 {
 160         int i;
 161
 162         /* poll until codec valid */
 163         for (i = 0; (i < TIMEOUT) &&
 164             !(via_rd(via, VIA_CODEC_CTL, 4) & VIA_CODEC_PRIVALID); i++)
 165                     DELAY(1);
 166         if (i >= TIMEOUT) {
 167                 printf("via: codec invalid\n");
 168                 return 1;
 169         }
 170
 171         return 0;
 172 }
 173
 174
 175 static int
 176 via_write_codec(kobj_t obj, void *addr, int reg, u_int32_t val)
 177 {
 178         struct via_info *via = addr;
 179
 180         if (via_waitready_codec(via)) return -1;
 181
 182         via_wr(via, VIA_CODEC_CTL, VIA_CODEC_PRIVALID | VIA_CODEC_INDEX(reg) | val, 4);
 183
 184         return 0;
 185 }
 186
 187
 188 static int
 189 via_read_codec(kobj_t obj, void *addr, int reg)
 190 {
 191         struct via_info *via = addr;
 192
 193         if (via_waitready_codec(via))
 194                 return -1;
 195
 196         via_wr(via, VIA_CODEC_CTL, VIA_CODEC_PRIVALID | VIA_CODEC_READ | VIA_CODEC_INDEX(reg),4);
 197
 198         if (via_waitready_codec(via))
 199                 return -1;
 200
 201         if (via_waitvalid_codec(via))
 202                 return -1;
 203
 204         return via_rd(via, VIA_CODEC_CTL, 2);
 205 }
 206
 207 static kobj_method_t via_ac97_methods[] = {
 208         KOBJMETHOD(ac97_read,           via_read_codec),
 209         KOBJMETHOD(ac97_write,          via_write_codec),
 210         { 0, 0 }
 211 };
 212 AC97_DECLARE(via_ac97);
 213
 214 /* -------------------------------------------------------------------- */
 215
 216 static int
 217 via_buildsgdt(struct via_chinfo *ch)
 218 {
 219         u_int32_t phys_addr, flag;
 220         int i, segs, seg_size;
 221
 222         /*
 223          *  Build the scatter/gather DMA (SGD) table.
 224          *  There are four slots in the table: two for play, two for record.
 225          *  This creates two half-buffers, one of which is playing; the other
 226          *  is feeding.
 227          */
 228         seg_size = ch->blksz;
 229         segs = sndbuf_getsize(ch->buffer) / seg_size;
 230         phys_addr = vtophys(sndbuf_getbuf(ch->buffer));
 231
 232         for (i = 0; i < segs; i++) {
 233                 flag = (i == segs - 1)? VIA_DMAOP_EOL : VIA_DMAOP_FLAG;
 234                 ch->sgd_table[i].ptr = phys_addr + (i * seg_size);
 235                 ch->sgd_table[i].flags = flag | seg_size;
 236         }
 237
 238         return 0;
 239 }
 240
 241 /* channel interface */
 242 static void *
 243 viachan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
 244 {
 245         struct via_info *via = devinfo;
 246         struct via_chinfo *ch = (dir == PCMDIR_PLAY)? &via->pch : &via->rch;
 247
 248         ch->parent = via;
 249         ch->channel = c;
 250         ch->buffer = b;
 251         ch->dir = dir;
 252         ch->sgd_table = &via->sgd_table[(dir == PCMDIR_PLAY)? 0 : SEGS_PER_CHAN];
 253         if (ch->dir == PCMDIR_PLAY) {
 254                 ch->base = VIA_PLAY_DMAOPS_BASE;
 255                 ch->count = VIA_PLAY_DMAOPS_COUNT;
 256                 ch->ctrl = VIA_PLAY_CONTROL;
 257                 ch->mode = VIA_PLAY_MODE;
 258         } else {
 259                 ch->base = VIA_RECORD_DMAOPS_BASE;
 260                 ch->count = VIA_RECORD_DMAOPS_COUNT;
 261                 ch->ctrl = VIA_RECORD_CONTROL;
 262                 ch->mode = VIA_RECORD_MODE;
 263         }
 264
 265         if (sndbuf_alloc(ch->buffer, via->parent_dmat, via->bufsz) == -1)
 266                 return NULL;
 267         return ch;
 268 }
 269
 270 static int
 271 viachan_setformat(kobj_t obj, void *data, u_int32_t format)
 272 {
 273         struct via_chinfo *ch = data;
 274         struct via_info *via = ch->parent;
 275         int mode, mode_set;
 276
 277         mode_set = 0;
 278         if (format & AFMT_STEREO)
 279                 mode_set |= VIA_RPMODE_STEREO;
 280         if (format & AFMT_S16_LE)
 281                 mode_set |= VIA_RPMODE_16BIT;
 282
 283         DEB(printf("set format: dir = %d, format=%x\n", ch->dir, format));
 284         mode = via_rd(via, ch->mode, 1);
 285         mode &= ~(VIA_RPMODE_16BIT | VIA_RPMODE_STEREO);
 286         mode |= mode_set;
 287         via_wr(via, ch->mode, mode, 1);
 288
 289         return 0;
 290 }
 291
 292 static int
 293 viachan_setspeed(kobj_t obj, void *data, u_int32_t speed)
 294 {
 295         struct via_chinfo *ch = data;
 296         struct via_info *via = ch->parent;
 297         int reg;
 298
 299         /*
 300          *  Basic AC'97 defines a 48 kHz sample rate only.  For other rates,
 301          *  upsampling is required.
 302          *
 303          *  The VT82C686A does not perform upsampling, and neither do we.
 304          *  If the codec supports variable-rate audio (i.e. does the upsampling
 305          *  itself), then negotiate the rate with the codec.  Otherwise,
 306          *  return 48 kHz cuz that's all you got.
 307          */
 308         if (via->codec_caps & AC97_EXTCAP_VRA) {
 309                 reg = (ch->dir == PCMDIR_PLAY)? AC97_REGEXT_FDACRATE : AC97_REGEXT_LADCRATE;
 310                 return ac97_setrate(via->codec, reg, speed);
 311         } else
 312                 return 48000;
 313 }
 314
 315 static int
 316 viachan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
 317 {
 318         struct via_chinfo *ch = data;
 319
 320         ch->blksz = blocksize;
 321         sndbuf_resize(ch->buffer, SEGS_PER_CHAN, ch->blksz);
 322
 323         return ch->blksz;
 324 }
 325
 326 static int
 327 viachan_trigger(kobj_t obj, void *data, int go)
 328 {
 329         struct via_chinfo *ch = data;
 330         struct via_info *via = ch->parent;
 331         struct via_dma_op *ado;
 332
 333         if (go == PCMTRIG_EMLDMAWR || go == PCMTRIG_EMLDMARD)
 334                 return 0;
 335
 336         ado = ch->sgd_table;
 337         DEB(printf("ado located at va=%p pa=%x\n", ado, vtophys(ado)));
 338
 339         if (go == PCMTRIG_START) {
 340                 via_buildsgdt(ch);
 341                 via_wr(via, ch->base, vtophys(ado), 4);
 342                 via_wr(via, ch->ctrl, VIA_RPCTRL_START, 1);
 343         } else
 344                 via_wr(via, ch->ctrl, VIA_RPCTRL_TERMINATE, 1);
 345
 346         DEB(printf("viachan_trigger: go=%d\n", go));
 347         return 0;
 348 }
 349
 350 static int
 351 viachan_getptr(kobj_t obj, void *data)
 352 {
 353         struct via_chinfo *ch = data;
 354         struct via_info *via = ch->parent;
 355         struct via_dma_op *ado;
 356         int ptr, base, base1, len, seg;
 357
 358         ado = ch->sgd_table;
 359         base1 = via_rd(via, ch->base, 4);
 360         len = via_rd(via, ch->count, 4);
 361         base = via_rd(via, ch->base, 4);
 362         if (base != base1)      /* Avoid race hazard */
 363                 len = via_rd(via, ch->count, 4);
 364
 365         DEB(printf("viachan_getptr: len / base = %x / %x\n", len, base));
 366
 367         /* Base points to SGD segment to do, one past current */
 368
 369         /* Determine how many segments have been done */
 370         seg = (base - vtophys(ado)) / sizeof(struct via_dma_op);
 371         if (seg == 0)
 372                 seg = SEGS_PER_CHAN;
 373
 374         /* Now work out offset: seg less count */
 375         ptr = (seg * sndbuf_getsize(ch->buffer) / SEGS_PER_CHAN) - len;
 376         if (ch->dir == PCMDIR_REC) {
 377                 /* DMA appears to operate on memory 'lines' of 32 bytes */
 378                 /* so don't return any part line - it isn't in RAM yet  */
 379                 ptr = ptr & ~0x1f;
 380         }
 381
 382         DEB(printf("return ptr=%d\n", ptr));
 383         return ptr;
 384 }
 385
 386 static struct pcmchan_caps *
 387 viachan_getcaps(kobj_t obj, void *data)
 388 {
 389         struct via_chinfo *ch = data;
 390         struct via_info *via = ch->parent;
 391
 392         return (via->codec_caps & AC97_EXTCAP_VRA)? &via_vracaps : &via_caps;
 393 }
 394
 395 static kobj_method_t viachan_methods[] = {
 396         KOBJMETHOD(channel_init,                viachan_init),
 397         KOBJMETHOD(channel_setformat,           viachan_setformat),
 398         KOBJMETHOD(channel_setspeed,            viachan_setspeed),
 399         KOBJMETHOD(channel_setblocksize,        viachan_setblocksize),
 400         KOBJMETHOD(channel_trigger,             viachan_trigger),
 401         KOBJMETHOD(channel_getptr,              viachan_getptr),
 402         KOBJMETHOD(channel_getcaps,             viachan_getcaps),
 403         { 0, 0 }
 404 };
 405 CHANNEL_DECLARE(viachan);
 406
 407 /* -------------------------------------------------------------------- */
 408
 409 static void
 410 via_intr(void *p)
 411 {
 412         struct via_info *via = p;
 413         int             st;
 414
 415         /* DEB(printf("viachan_intr\n")); */
 416         /* Read channel */
 417         st = via_rd(via, VIA_PLAY_STAT, 1);
 418         if (st & VIA_RPSTAT_INTR) {
 419                 via_wr(via, VIA_PLAY_STAT, VIA_RPSTAT_INTR, 1);
 420                 chn_intr(via->pch.channel);
 421         }
 422
 423         /* Write channel */
 424         st = via_rd(via, VIA_RECORD_STAT, 1);
 425         if (st & VIA_RPSTAT_INTR) {
 426                 via_wr(via, VIA_RECORD_STAT, VIA_RPSTAT_INTR, 1);
 427                 chn_intr(via->rch.channel);
 428         }
 429 }
 430
 431 /*
 432  *  Probe and attach the card
 433  */
 434 static int
 435 via_probe(device_t dev)
 436 {
 437         if (pci_get_devid(dev) == VIA_PCI_ID) {
 438             device_set_desc(dev, "VIA VT82C686A");
 439             return 0;
 440         }
 441         return ENXIO;
 442 }
 443
 444
 445 static void
 446 dma_cb(void *p, bus_dma_segment_t *bds, int a, int b)
 447 {
 448 }
 449
 450
 451 static int
 452 via_attach(device_t dev)
 453 {
 454         struct via_info *via = 0;
 455         char status[SND_STATUSLEN];
 456         u_int32_t data, cnt;
 457
 458         if ((via = kmalloc(sizeof *via, M_DEVBUF, M_NOWAIT | M_ZERO)) == NULL) {
 459                 device_printf(dev, "cannot allocate softc\n");
 460                 return ENXIO;
 461         }
 462
 463         /* Get resources */
 464         data = pci_read_config(dev, PCIR_COMMAND, 2);
 465         data |= (PCIM_CMD_PORTEN | PCIM_CMD_BUSMASTEREN);
 466         pci_write_config(dev, PCIR_COMMAND, data, 2);
 467         data = pci_read_config(dev, PCIR_COMMAND, 2);
 468
 469         /* Wake up and reset AC97 if necessary */
 470         data = pci_read_config(dev, VIA_AC97STATUS, 1);
 471
 472         if ((data & VIA_AC97STATUS_RDY) == 0) {
 473                 /* Cold reset per ac97r2.3 spec (page 95) */
 474                 pci_write_config(dev, VIA_ACLINKCTRL, VIA_ACLINK_EN, 1);                        /* Assert low */
 475                 DELAY(100);                                                                     /* Wait T_rst_low */
 476                 pci_write_config(dev, VIA_ACLINKCTRL, VIA_ACLINK_EN | VIA_ACLINK_NRST, 1);      /* Assert high */
 477                 DELAY(5);                                                                       /* Wait T_rst2clk */
 478                 pci_write_config(dev, VIA_ACLINKCTRL, VIA_ACLINK_EN, 1);                        /* Assert low */
 479         } else {
 480                 /* Warm reset */
 481                 pci_write_config(dev, VIA_ACLINKCTRL, VIA_ACLINK_EN, 1);                        /* Force no sync */
 482                 DELAY(100);
 483                 pci_write_config(dev, VIA_ACLINKCTRL, VIA_ACLINK_EN | VIA_ACLINK_SYNC, 1);      /* Sync */
 484                 DELAY(5);                                                                       /* Wait T_sync_high */
 485                 pci_write_config(dev, VIA_ACLINKCTRL, VIA_ACLINK_EN, 1);                        /* Force no sync */
 486                 DELAY(5);                                                                       /* Wait T_sync2clk */
 487         }
 488
 489         /* Power everything up */
 490         pci_write_config(dev, VIA_ACLINKCTRL, VIA_ACLINK_DESIRED, 1);
 491
 492         /* Wait for codec to become ready (largest reported delay here 310ms) */
 493         for (cnt = 0; cnt < 2000; cnt++) {
 494                 data = pci_read_config(dev, VIA_AC97STATUS, 1);
 495                 if (data & VIA_AC97STATUS_RDY)
 496                         break;
 497                 DELAY(5000);
 498         }
 499
 500         via->regid = PCIR_MAPS;
 501         via->reg = bus_alloc_resource(dev, SYS_RES_IOPORT, &via->regid, 0, ~0, 1, RF_ACTIVE);
 502         if (!via->reg) {
 503                 device_printf(dev, "cannot allocate bus resource.");
 504                 goto bad;
 505         }
 506         via->st = rman_get_bustag(via->reg);
 507         via->sh = rman_get_bushandle(via->reg);
 508
 509         via->bufsz = pcm_getbuffersize(dev, 4096, VIA_DEFAULT_BUFSZ, 65536);
 510
 511         via->irqid = 0;
 512         via->irq = bus_alloc_resource(dev, SYS_RES_IRQ, &via->irqid, 0, ~0, 1, RF_ACTIVE | RF_SHAREABLE);
 513         if (!via->irq || snd_setup_intr(dev, via->irq, 0, via_intr, via, &via->ih, NULL)) {
 514                 device_printf(dev, "unable to map interrupt\n");
 515                 goto bad;
 516         }
 517
 518         via_wr(via, VIA_PLAY_MODE, VIA_RPMODE_AUTOSTART | VIA_RPMODE_INTR_FLAG | VIA_RPMODE_INTR_EOL, 1);
 519         via_wr(via, VIA_RECORD_MODE, VIA_RPMODE_AUTOSTART | VIA_RPMODE_INTR_FLAG | VIA_RPMODE_INTR_EOL, 1);
 520
 521         via->codec = AC97_CREATE(dev, via, via_ac97);
 522         if (!via->codec)
 523                 goto bad;
 524
 525         if (mixer_init(dev, ac97_getmixerclass(), via->codec))
 526                 goto bad;
 527
 528         via->codec_caps = ac97_getextcaps(via->codec);
 529         ac97_setextmode(via->codec,
 530                         via->codec_caps & (AC97_EXTCAP_VRA | AC97_EXTCAP_VRM));
 531
 532         /* DMA tag for buffers */
 533         if (bus_dma_tag_create(/*parent*/NULL, /*alignment*/2, /*boundary*/0,
 534                 /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
 535                 /*highaddr*/BUS_SPACE_MAXADDR,
 536                 /*filter*/NULL, /*filterarg*/NULL,
 537                 /*maxsize*/via->bufsz, /*nsegments*/1, /*maxsegz*/0x3ffff,
 538                 /*flags*/0, &via->parent_dmat) != 0) {
 539                 device_printf(dev, "unable to create dma tag\n");
 540                 goto bad;
 541         }
 542
 543         /*
 544          *  DMA tag for SGD table.  The 686 uses scatter/gather DMA and
 545          *  requires a list in memory of work to do.  We need only 16 bytes
 546          *  for this list, and it is wasteful to allocate 16K.
 547          */
 548         if (bus_dma_tag_create(/*parent*/NULL, /*alignment*/2, /*boundary*/0,
 549                 /*lowaddr*/BUS_SPACE_MAXADDR_32BIT,
 550                 /*highaddr*/BUS_SPACE_MAXADDR,
 551                 /*filter*/NULL, /*filterarg*/NULL,
 552                 /*maxsize*/NSEGS * sizeof(struct via_dma_op),
 553                 /*nsegments*/1, /*maxsegz*/0x3ffff,
 554                 /*flags*/0, &via->sgd_dmat) != 0) {
 555                 device_printf(dev, "unable to create dma tag\n");
 556                 goto bad;
 557         }
 558
 559         if (bus_dmamem_alloc(via->sgd_dmat, (void **)&via->sgd_table, BUS_DMA_NOWAIT, &via->sgd_dmamap) == -1)
 560                 goto bad;
 561         if (bus_dmamap_load(via->sgd_dmat, via->sgd_dmamap, via->sgd_table, NSEGS * sizeof(struct via_dma_op), dma_cb, 0, 0))
 562                 goto bad;
 563
 564         ksnprintf(status, SND_STATUSLEN, "at io 0x%lx irq %ld", rman_get_start(via->reg), rman_get_start(via->irq));
 565
 566         /* Register */
 567         if (pcm_register(dev, via, 1, 1)) goto bad;
 568         pcm_addchan(dev, PCMDIR_PLAY, &viachan_class, via);
 569         pcm_addchan(dev, PCMDIR_REC, &viachan_class, via);
 570         pcm_setstatus(dev, status);
 571         return 0;
 572 bad:
 573         if (via->codec) ac97_destroy(via->codec);
 574         if (via->reg) bus_release_resource(dev, SYS_RES_IOPORT, via->regid, via->reg);
 575         if (via->ih) bus_teardown_intr(dev, via->irq, via->ih);
 576         if (via->irq) bus_release_resource(dev, SYS_RES_IRQ, via->irqid, via->irq);
 577         if (via->parent_dmat) bus_dma_tag_destroy(via->parent_dmat);
 578         if (via->sgd_dmamap) bus_dmamap_unload(via->sgd_dmat, via->sgd_dmamap);
 579         if (via->sgd_dmat) bus_dma_tag_destroy(via->sgd_dmat);
 580         if (via) kfree(via, M_DEVBUF);
 581         return ENXIO;
 582 }
 583
 584 static int
 585 via_detach(device_t dev)
 586 {
 587         int r;
 588         struct via_info *via = 0;
 589
 590         r = pcm_unregister(dev);
 591         if (r)
 592                 return r;
 593
 594         via = pcm_getdevinfo(dev);
 595         bus_release_resource(dev, SYS_RES_IOPORT, via->regid, via->reg);
 596         bus_teardown_intr(dev, via->irq, via->ih);
 597         bus_release_resource(dev, SYS_RES_IRQ, via->irqid, via->irq);
 598         bus_dma_tag_destroy(via->parent_dmat);
 599         bus_dmamap_unload(via->sgd_dmat, via->sgd_dmamap);
 600         bus_dma_tag_destroy(via->sgd_dmat);
 601         kfree(via, M_DEVBUF);
 602         return 0;
 603 }
 604
 605
 606 static device_method_t via_methods[] = {
 607         DEVMETHOD(device_probe,         via_probe),
 608         DEVMETHOD(device_attach,        via_attach),
 609         DEVMETHOD(device_detach,        via_detach),
 610         { 0, 0}
 611 };
 612
 613 static driver_t via_driver = {
 614         "pcm",
 615         via_methods,
 616         PCM_SOFTC_SIZE,
 617 };
 618
 619 DRIVER_MODULE(snd_via82c686, pci, via_driver, pcm_devclass, 0, 0);
 620 MODULE_DEPEND(snd_via82c686, snd_pcm, PCM_MINVER, PCM_PREFVER, PCM_MAXVER);
 621 MODULE_VERSION(snd_via82c686, 1);