sound/mips/sgio2audio.c

   1 /*
   2  *   Sound driver for Silicon Graphics O2 Workstations A/V board audio.
   3  *
   4  *   Copyright 2003 Vivien Chappelier <vivien.chappelier@linux-mips.org>
   5  *   Copyright 2008 Thomas Bogendoerfer <tsbogend@alpha.franken.de>
   6  *   Mxier part taken from mace_audio.c:
   7  *   Copyright 2007 Thorben Jändling <tj.trevelyan@gmail.com>
   8  *
   9  *   This program is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU General Public License as published by
  11  *   the Free Software Foundation; either version 2 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This program is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with this program; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  22  *
  23  */
  24
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/io.h>
  32 #include <linux/slab.h>
  33 #include <linux/module.h>
  34
  35 #include <asm/ip32/ip32_ints.h>
  36 #include <asm/ip32/mace.h>
  37
  38 #include <sound/core.h>
  39 #include <sound/control.h>
  40 #include <sound/pcm.h>
  41 #define SNDRV_GET_ID
  42 #include <sound/initval.h>
  43 #include <sound/ad1843.h>
  44
  45
  46 MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org>");
  47 MODULE_DESCRIPTION("SGI O2 Audio");
  48 MODULE_LICENSE("GPL");
  49 MODULE_SUPPORTED_DEVICE("{{Silicon Graphics, O2 Audio}}");
  50
  51 static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
  52 static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  53
  54 module_param(index, int, 0444);
  55 MODULE_PARM_DESC(index, "Index value for SGI O2 soundcard.");
  56 module_param(id, charp, 0444);
  57 MODULE_PARM_DESC(id, "ID string for SGI O2 soundcard.");
  58
  59
  60 #define AUDIO_CONTROL_RESET              BIT(0) /* 1: reset audio interface */
  61 #define AUDIO_CONTROL_CODEC_PRESENT      BIT(1) /* 1: codec detected */
  62
  63 #define CODEC_CONTROL_WORD_SHIFT        0
  64 #define CODEC_CONTROL_READ              BIT(16)
  65 #define CODEC_CONTROL_ADDRESS_SHIFT     17
  66
  67 #define CHANNEL_CONTROL_RESET           BIT(10) /* 1: reset channel */
  68 #define CHANNEL_DMA_ENABLE              BIT(9)  /* 1: enable DMA transfer */
  69 #define CHANNEL_INT_THRESHOLD_DISABLED  (0 << 5) /* interrupt disabled */
  70 #define CHANNEL_INT_THRESHOLD_25        (1 << 5) /* int on buffer >25% full */
  71 #define CHANNEL_INT_THRESHOLD_50        (2 << 5) /* int on buffer >50% full */
  72 #define CHANNEL_INT_THRESHOLD_75        (3 << 5) /* int on buffer >75% full */
  73 #define CHANNEL_INT_THRESHOLD_EMPTY     (4 << 5) /* int on buffer empty */
  74 #define CHANNEL_INT_THRESHOLD_NOT_EMPTY (5 << 5) /* int on buffer !empty */
  75 #define CHANNEL_INT_THRESHOLD_FULL      (6 << 5) /* int on buffer empty */
  76 #define CHANNEL_INT_THRESHOLD_NOT_FULL  (7 << 5) /* int on buffer !empty */
  77
  78 #define CHANNEL_RING_SHIFT              12
  79 #define CHANNEL_RING_SIZE               (1 << CHANNEL_RING_SHIFT)
  80 #define CHANNEL_RING_MASK               (CHANNEL_RING_SIZE - 1)
  81
  82 #define CHANNEL_LEFT_SHIFT 40
  83 #define CHANNEL_RIGHT_SHIFT 8
  84
  85 struct snd_sgio2audio_chan {
  86         int idx;
  87         struct snd_pcm_substream *substream;
  88         int pos;
  89         snd_pcm_uframes_t size;
  90         spinlock_t lock;
  91 };
  92
  93 /* definition of the chip-specific record */
  94 struct snd_sgio2audio {
  95         struct snd_card *card;
  96
  97         /* codec */
  98         struct snd_ad1843 ad1843;
  99         spinlock_t ad1843_lock;
 100
 101         /* channels */
 102         struct snd_sgio2audio_chan channel[3];
 103
 104         /* resources */
 105         void *ring_base;
 106         dma_addr_t ring_base_dma;
 107 };
 108
 109 /* AD1843 access */
 110
 111 /*
 112  * read_ad1843_reg returns the current contents of a 16 bit AD1843 register.
 113  *
 114  * Returns unsigned register value on success, -errno on failure.
 115  */
 116 static int read_ad1843_reg(void *priv, int reg)
 117 {
 118         struct snd_sgio2audio *chip = priv;
 119         int val;
 120         unsigned long flags;
 121
 122         spin_lock_irqsave(&chip->ad1843_lock, flags);
 123
 124         writeq((reg << CODEC_CONTROL_ADDRESS_SHIFT) |
 125                CODEC_CONTROL_READ, &mace->perif.audio.codec_control);
 126         wmb();
 127         val = readq(&mace->perif.audio.codec_control); /* flush bus */
 128         udelay(200);
 129
 130         val = readq(&mace->perif.audio.codec_read);
 131
 132         spin_unlock_irqrestore(&chip->ad1843_lock, flags);
 133         return val;
 134 }
 135
 136 /*
 137  * write_ad1843_reg writes the specified value to a 16 bit AD1843 register.
 138  */
 139 static int write_ad1843_reg(void *priv, int reg, int word)
 140 {
 141         struct snd_sgio2audio *chip = priv;
 142         int val;
 143         unsigned long flags;
 144
 145         spin_lock_irqsave(&chip->ad1843_lock, flags);
 146
 147         writeq((reg << CODEC_CONTROL_ADDRESS_SHIFT) |
 148                (word << CODEC_CONTROL_WORD_SHIFT),
 149                &mace->perif.audio.codec_control);
 150         wmb();
 151         val = readq(&mace->perif.audio.codec_control); /* flush bus */
 152         udelay(200);
 153
 154         spin_unlock_irqrestore(&chip->ad1843_lock, flags);
 155         return 0;
 156 }
 157
 158 static int sgio2audio_gain_info(struct snd_kcontrol *kcontrol,
 159                                struct snd_ctl_elem_info *uinfo)
 160 {
 161         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
 162
 163         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 164         uinfo->count = 2;
 165         uinfo->value.integer.min = 0;
 166         uinfo->value.integer.max = ad1843_get_gain_max(&chip->ad1843,
 167                                              (int)kcontrol->private_value);
 168         return 0;
 169 }
 170
 171 static int sgio2audio_gain_get(struct snd_kcontrol *kcontrol,
 172                                struct snd_ctl_elem_value *ucontrol)
 173 {
 174         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
 175         int vol;
 176
 177         vol = ad1843_get_gain(&chip->ad1843, (int)kcontrol->private_value);
 178
 179         ucontrol->value.integer.value[0] = (vol >> 8) & 0xFF;
 180         ucontrol->value.integer.value[1] = vol & 0xFF;
 181
 182         return 0;
 183 }
 184
 185 static int sgio2audio_gain_put(struct snd_kcontrol *kcontrol,
 186                         struct snd_ctl_elem_value *ucontrol)
 187 {
 188         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
 189         int newvol, oldvol;
 190
 191         oldvol = ad1843_get_gain(&chip->ad1843, kcontrol->private_value);
 192         newvol = (ucontrol->value.integer.value[0] << 8) |
 193                 ucontrol->value.integer.value[1];
 194
 195         newvol = ad1843_set_gain(&chip->ad1843, kcontrol->private_value,
 196                 newvol);
 197
 198         return newvol != oldvol;
 199 }
 200
 201 static int sgio2audio_source_info(struct snd_kcontrol *kcontrol,
 202                                struct snd_ctl_elem_info *uinfo)
 203 {
 204         static const char * const texts[3] = {
 205                 "Cam Mic", "Mic", "Line"
 206         };
 207         return snd_ctl_enum_info(uinfo, 1, 3, texts);
 208 }
 209
 210 static int sgio2audio_source_get(struct snd_kcontrol *kcontrol,
 211                                struct snd_ctl_elem_value *ucontrol)
 212 {
 213         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
 214
 215         ucontrol->value.enumerated.item[0] = ad1843_get_recsrc(&chip->ad1843);
 216         return 0;
 217 }
 218
 219 static int sgio2audio_source_put(struct snd_kcontrol *kcontrol,
 220                         struct snd_ctl_elem_value *ucontrol)
 221 {
 222         struct snd_sgio2audio *chip = snd_kcontrol_chip(kcontrol);
 223         int newsrc, oldsrc;
 224
 225         oldsrc = ad1843_get_recsrc(&chip->ad1843);
 226         newsrc = ad1843_set_recsrc(&chip->ad1843,
 227                                    ucontrol->value.enumerated.item[0]);
 228
 229         return newsrc != oldsrc;
 230 }
 231
 232 /* dac1/pcm0 mixer control */
 233 static struct snd_kcontrol_new sgio2audio_ctrl_pcm0 = {
 234         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 235         .name           = "PCM Playback Volume",
 236         .index          = 0,
 237         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 238         .private_value  = AD1843_GAIN_PCM_0,
 239         .info           = sgio2audio_gain_info,
 240         .get            = sgio2audio_gain_get,
 241         .put            = sgio2audio_gain_put,
 242 };
 243
 244 /* dac2/pcm1 mixer control */
 245 static struct snd_kcontrol_new sgio2audio_ctrl_pcm1 = {
 246         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 247         .name           = "PCM Playback Volume",
 248         .index          = 1,
 249         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 250         .private_value  = AD1843_GAIN_PCM_1,
 251         .info           = sgio2audio_gain_info,
 252         .get            = sgio2audio_gain_get,
 253         .put            = sgio2audio_gain_put,
 254 };
 255
 256 /* record level mixer control */
 257 static struct snd_kcontrol_new sgio2audio_ctrl_reclevel = {
 258         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 259         .name           = "Capture Volume",
 260         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 261         .private_value  = AD1843_GAIN_RECLEV,
 262         .info           = sgio2audio_gain_info,
 263         .get            = sgio2audio_gain_get,
 264         .put            = sgio2audio_gain_put,
 265 };
 266
 267 /* record level source control */
 268 static struct snd_kcontrol_new sgio2audio_ctrl_recsource = {
 269         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 270         .name           = "Capture Source",
 271         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 272         .info           = sgio2audio_source_info,
 273         .get            = sgio2audio_source_get,
 274         .put            = sgio2audio_source_put,
 275 };
 276
 277 /* line mixer control */
 278 static struct snd_kcontrol_new sgio2audio_ctrl_line = {
 279         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 280         .name           = "Line Playback Volume",
 281         .index          = 0,
 282         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 283         .private_value  = AD1843_GAIN_LINE,
 284         .info           = sgio2audio_gain_info,
 285         .get            = sgio2audio_gain_get,
 286         .put            = sgio2audio_gain_put,
 287 };
 288
 289 /* cd mixer control */
 290 static struct snd_kcontrol_new sgio2audio_ctrl_cd = {
 291         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 292         .name           = "Line Playback Volume",
 293         .index          = 1,
 294         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 295         .private_value  = AD1843_GAIN_LINE_2,
 296         .info           = sgio2audio_gain_info,
 297         .get            = sgio2audio_gain_get,
 298         .put            = sgio2audio_gain_put,
 299 };
 300
 301 /* mic mixer control */
 302 static struct snd_kcontrol_new sgio2audio_ctrl_mic = {
 303         .iface          = SNDRV_CTL_ELEM_IFACE_MIXER,
 304         .name           = "Mic Playback Volume",
 305         .access         = SNDRV_CTL_ELEM_ACCESS_READWRITE,
 306         .private_value  = AD1843_GAIN_MIC,
 307         .info           = sgio2audio_gain_info,
 308         .get            = sgio2audio_gain_get,
 309         .put            = sgio2audio_gain_put,
 310 };
 311
 312
 313 static int snd_sgio2audio_new_mixer(struct snd_sgio2audio *chip)
 314 {
 315         int err;
 316
 317         err = snd_ctl_add(chip->card,
 318                           snd_ctl_new1(&sgio2audio_ctrl_pcm0, chip));
 319         if (err < 0)
 320                 return err;
 321
 322         err = snd_ctl_add(chip->card,
 323                           snd_ctl_new1(&sgio2audio_ctrl_pcm1, chip));
 324         if (err < 0)
 325                 return err;
 326
 327         err = snd_ctl_add(chip->card,
 328                           snd_ctl_new1(&sgio2audio_ctrl_reclevel, chip));
 329         if (err < 0)
 330                 return err;
 331
 332         err = snd_ctl_add(chip->card,
 333                           snd_ctl_new1(&sgio2audio_ctrl_recsource, chip));
 334         if (err < 0)
 335                 return err;
 336         err = snd_ctl_add(chip->card,
 337                           snd_ctl_new1(&sgio2audio_ctrl_line, chip));
 338         if (err < 0)
 339                 return err;
 340
 341         err = snd_ctl_add(chip->card,
 342                           snd_ctl_new1(&sgio2audio_ctrl_cd, chip));
 343         if (err < 0)
 344                 return err;
 345
 346         err = snd_ctl_add(chip->card,
 347                           snd_ctl_new1(&sgio2audio_ctrl_mic, chip));
 348         if (err < 0)
 349                 return err;
 350
 351         return 0;
 352 }
 353
 354 /* low-level audio interface DMA */
 355
 356 /* get data out of bounce buffer, count must be a multiple of 32 */
 357 /* returns 1 if a period has elapsed */
 358 static int snd_sgio2audio_dma_pull_frag(struct snd_sgio2audio *chip,
 359                                         unsigned int ch, unsigned int count)
 360 {
 361         int ret;
 362         unsigned long src_base, src_pos, dst_mask;
 363         unsigned char *dst_base;
 364         int dst_pos;
 365         u64 *src;
 366         s16 *dst;
 367         u64 x;
 368         unsigned long flags;
 369         struct snd_pcm_runtime *runtime = chip->channel[ch].substream->runtime;
 370
 371         spin_lock_irqsave(&chip->channel[ch].lock, flags);
 372
 373         src_base = (unsigned long) chip->ring_base | (ch << CHANNEL_RING_SHIFT);
 374         src_pos = readq(&mace->perif.audio.chan[ch].read_ptr);
 375         dst_base = runtime->dma_area;
 376         dst_pos = chip->channel[ch].pos;
 377         dst_mask = frames_to_bytes(runtime, runtime->buffer_size) - 1;
 378
 379         /* check if a period has elapsed */
 380         chip->channel[ch].size += (count >> 3); /* in frames */
 381         ret = chip->channel[ch].size >= runtime->period_size;
 382         chip->channel[ch].size %= runtime->period_size;
 383
 384         while (count) {
 385                 src = (u64 *)(src_base + src_pos);
 386                 dst = (s16 *)(dst_base + dst_pos);
 387
 388                 x = *src;
 389                 dst[0] = (x >> CHANNEL_LEFT_SHIFT) & 0xffff;
 390                 dst[1] = (x >> CHANNEL_RIGHT_SHIFT) & 0xffff;
 391
 392                 src_pos = (src_pos + sizeof(u64)) & CHANNEL_RING_MASK;
 393                 dst_pos = (dst_pos + 2 * sizeof(s16)) & dst_mask;
 394                 count -= sizeof(u64);
 395         }
 396
 397         writeq(src_pos, &mace->perif.audio.chan[ch].read_ptr); /* in bytes */
 398         chip->channel[ch].pos = dst_pos;
 399
 400         spin_unlock_irqrestore(&chip->channel[ch].lock, flags);
 401         return ret;
 402 }
 403
 404 /* put some DMA data in bounce buffer, count must be a multiple of 32 */
 405 /* returns 1 if a period has elapsed */
 406 static int snd_sgio2audio_dma_push_frag(struct snd_sgio2audio *chip,
 407                                         unsigned int ch, unsigned int count)
 408 {
 409         int ret;
 410         s64 l, r;
 411         unsigned long dst_base, dst_pos, src_mask;
 412         unsigned char *src_base;
 413         int src_pos;
 414         u64 *dst;
 415         s16 *src;
 416         unsigned long flags;
 417         struct snd_pcm_runtime *runtime = chip->channel[ch].substream->runtime;
 418
 419         spin_lock_irqsave(&chip->channel[ch].lock, flags);
 420
 421         dst_base = (unsigned long)chip->ring_base | (ch << CHANNEL_RING_SHIFT);
 422         dst_pos = readq(&mace->perif.audio.chan[ch].write_ptr);
 423         src_base = runtime->dma_area;
 424         src_pos = chip->channel[ch].pos;
 425         src_mask = frames_to_bytes(runtime, runtime->buffer_size) - 1;
 426
 427         /* check if a period has elapsed */
 428         chip->channel[ch].size += (count >> 3); /* in frames */
 429         ret = chip->channel[ch].size >= runtime->period_size;
 430         chip->channel[ch].size %= runtime->period_size;
 431
 432         while (count) {
 433                 src = (s16 *)(src_base + src_pos);
 434                 dst = (u64 *)(dst_base + dst_pos);
 435
 436                 l = src[0]; /* sign extend */
 437                 r = src[1]; /* sign extend */
 438
 439                 *dst = ((l & 0x00ffffff) << CHANNEL_LEFT_SHIFT) |
 440                         ((r & 0x00ffffff) << CHANNEL_RIGHT_SHIFT);
 441
 442                 dst_pos = (dst_pos + sizeof(u64)) & CHANNEL_RING_MASK;
 443                 src_pos = (src_pos + 2 * sizeof(s16)) & src_mask;
 444                 count -= sizeof(u64);
 445         }
 446
 447         writeq(dst_pos, &mace->perif.audio.chan[ch].write_ptr); /* in bytes */
 448         chip->channel[ch].pos = src_pos;
 449
 450         spin_unlock_irqrestore(&chip->channel[ch].lock, flags);
 451         return ret;
 452 }
 453
 454 static int snd_sgio2audio_dma_start(struct snd_pcm_substream *substream)
 455 {
 456         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
 457         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
 458         int ch = chan->idx;
 459
 460         /* reset DMA channel */
 461         writeq(CHANNEL_CONTROL_RESET, &mace->perif.audio.chan[ch].control);
 462         udelay(10);
 463         writeq(0, &mace->perif.audio.chan[ch].control);
 464
 465         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 466                 /* push a full buffer */
 467                 snd_sgio2audio_dma_push_frag(chip, ch, CHANNEL_RING_SIZE - 32);
 468         }
 469         /* set DMA to wake on 50% empty and enable interrupt */
 470         writeq(CHANNEL_DMA_ENABLE | CHANNEL_INT_THRESHOLD_50,
 471                &mace->perif.audio.chan[ch].control);
 472         return 0;
 473 }
 474
 475 static int snd_sgio2audio_dma_stop(struct snd_pcm_substream *substream)
 476 {
 477         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
 478
 479         writeq(0, &mace->perif.audio.chan[chan->idx].control);
 480         return 0;
 481 }
 482
 483 static irqreturn_t snd_sgio2audio_dma_in_isr(int irq, void *dev_id)
 484 {
 485         struct snd_sgio2audio_chan *chan = dev_id;
 486         struct snd_pcm_substream *substream;
 487         struct snd_sgio2audio *chip;
 488         int count, ch;
 489
 490         substream = chan->substream;
 491         chip = snd_pcm_substream_chip(substream);
 492         ch = chan->idx;
 493
 494         /* empty the ring */
 495         count = CHANNEL_RING_SIZE -
 496                 readq(&mace->perif.audio.chan[ch].depth) - 32;
 497         if (snd_sgio2audio_dma_pull_frag(chip, ch, count))
 498                 snd_pcm_period_elapsed(substream);
 499
 500         return IRQ_HANDLED;
 501 }
 502
 503 static irqreturn_t snd_sgio2audio_dma_out_isr(int irq, void *dev_id)
 504 {
 505         struct snd_sgio2audio_chan *chan = dev_id;
 506         struct snd_pcm_substream *substream;
 507         struct snd_sgio2audio *chip;
 508         int count, ch;
 509
 510         substream = chan->substream;
 511         chip = snd_pcm_substream_chip(substream);
 512         ch = chan->idx;
 513         /* fill the ring */
 514         count = CHANNEL_RING_SIZE -
 515                 readq(&mace->perif.audio.chan[ch].depth) - 32;
 516         if (snd_sgio2audio_dma_push_frag(chip, ch, count))
 517                 snd_pcm_period_elapsed(substream);
 518
 519         return IRQ_HANDLED;
 520 }
 521
 522 static irqreturn_t snd_sgio2audio_error_isr(int irq, void *dev_id)
 523 {
 524         struct snd_sgio2audio_chan *chan = dev_id;
 525         struct snd_pcm_substream *substream;
 526
 527         substream = chan->substream;
 528         snd_sgio2audio_dma_stop(substream);
 529         snd_sgio2audio_dma_start(substream);
 530         return IRQ_HANDLED;
 531 }
 532
 533 /* PCM part */
 534 /* PCM hardware definition */
 535 static struct snd_pcm_hardware snd_sgio2audio_pcm_hw = {
 536         .info = (SNDRV_PCM_INFO_MMAP |
 537                  SNDRV_PCM_INFO_MMAP_VALID |
 538                  SNDRV_PCM_INFO_INTERLEAVED |
 539                  SNDRV_PCM_INFO_BLOCK_TRANSFER),
 540         .formats =          SNDRV_PCM_FMTBIT_S16_BE,
 541         .rates =            SNDRV_PCM_RATE_8000_48000,
 542         .rate_min =         8000,
 543         .rate_max =         48000,
 544         .channels_min =     2,
 545         .channels_max =     2,
 546         .buffer_bytes_max = 65536,
 547         .period_bytes_min = 32768,
 548         .period_bytes_max = 65536,
 549         .periods_min =      1,
 550         .periods_max =      1024,
 551 };
 552
 553 /* PCM playback open callback */
 554 static int snd_sgio2audio_playback1_open(struct snd_pcm_substream *substream)
 555 {
 556         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
 557         struct snd_pcm_runtime *runtime = substream->runtime;
 558
 559         runtime->hw = snd_sgio2audio_pcm_hw;
 560         runtime->private_data = &chip->channel[1];
 561         return 0;
 562 }
 563
 564 static int snd_sgio2audio_playback2_open(struct snd_pcm_substream *substream)
 565 {
 566         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
 567         struct snd_pcm_runtime *runtime = substream->runtime;
 568
 569         runtime->hw = snd_sgio2audio_pcm_hw;
 570         runtime->private_data = &chip->channel[2];
 571         return 0;
 572 }
 573
 574 /* PCM capture open callback */
 575 static int snd_sgio2audio_capture_open(struct snd_pcm_substream *substream)
 576 {
 577         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
 578         struct snd_pcm_runtime *runtime = substream->runtime;
 579
 580         runtime->hw = snd_sgio2audio_pcm_hw;
 581         runtime->private_data = &chip->channel[0];
 582         return 0;
 583 }
 584
 585 /* PCM close callback */
 586 static int snd_sgio2audio_pcm_close(struct snd_pcm_substream *substream)
 587 {
 588         struct snd_pcm_runtime *runtime = substream->runtime;
 589
 590         runtime->private_data = NULL;
 591         return 0;
 592 }
 593
 594
 595 /* hw_params callback */
 596 static int snd_sgio2audio_pcm_hw_params(struct snd_pcm_substream *substream,
 597                                         struct snd_pcm_hw_params *hw_params)
 598 {
 599         return snd_pcm_lib_alloc_vmalloc_buffer(substream,
 600                                                 params_buffer_bytes(hw_params));
 601 }
 602
 603 /* hw_free callback */
 604 static int snd_sgio2audio_pcm_hw_free(struct snd_pcm_substream *substream)
 605 {
 606         return snd_pcm_lib_free_vmalloc_buffer(substream);
 607 }
 608
 609 /* prepare callback */
 610 static int snd_sgio2audio_pcm_prepare(struct snd_pcm_substream *substream)
 611 {
 612         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
 613         struct snd_pcm_runtime *runtime = substream->runtime;
 614         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
 615         int ch = chan->idx;
 616         unsigned long flags;
 617
 618         spin_lock_irqsave(&chip->channel[ch].lock, flags);
 619
 620         /* Setup the pseudo-dma transfer pointers.  */
 621         chip->channel[ch].pos = 0;
 622         chip->channel[ch].size = 0;
 623         chip->channel[ch].substream = substream;
 624
 625         /* set AD1843 format */
 626         /* hardware format is always S16_LE */
 627         switch (substream->stream) {
 628         case SNDRV_PCM_STREAM_PLAYBACK:
 629                 ad1843_setup_dac(&chip->ad1843,
 630                                  ch - 1,
 631                                  runtime->rate,
 632                                  SNDRV_PCM_FORMAT_S16_LE,
 633                                  runtime->channels);
 634                 break;
 635         case SNDRV_PCM_STREAM_CAPTURE:
 636                 ad1843_setup_adc(&chip->ad1843,
 637                                  runtime->rate,
 638                                  SNDRV_PCM_FORMAT_S16_LE,
 639                                  runtime->channels);
 640                 break;
 641         }
 642         spin_unlock_irqrestore(&chip->channel[ch].lock, flags);
 643         return 0;
 644 }
 645
 646 /* trigger callback */
 647 static int snd_sgio2audio_pcm_trigger(struct snd_pcm_substream *substream,
 648                                       int cmd)
 649 {
 650         switch (cmd) {
 651         case SNDRV_PCM_TRIGGER_START:
 652                 /* start the PCM engine */
 653                 snd_sgio2audio_dma_start(substream);
 654                 break;
 655         case SNDRV_PCM_TRIGGER_STOP:
 656                 /* stop the PCM engine */
 657                 snd_sgio2audio_dma_stop(substream);
 658                 break;
 659         default:
 660                 return -EINVAL;
 661         }
 662         return 0;
 663 }
 664
 665 /* pointer callback */
 666 static snd_pcm_uframes_t
 667 snd_sgio2audio_pcm_pointer(struct snd_pcm_substream *substream)
 668 {
 669         struct snd_sgio2audio *chip = snd_pcm_substream_chip(substream);
 670         struct snd_sgio2audio_chan *chan = substream->runtime->private_data;
 671
 672         /* get the current hardware pointer */
 673         return bytes_to_frames(substream->runtime,
 674                                chip->channel[chan->idx].pos);
 675 }
 676
 677 /* operators */
 678 static struct snd_pcm_ops snd_sgio2audio_playback1_ops = {
 679         .open =        snd_sgio2audio_playback1_open,
 680         .close =       snd_sgio2audio_pcm_close,
 681         .ioctl =       snd_pcm_lib_ioctl,
 682         .hw_params =   snd_sgio2audio_pcm_hw_params,
 683         .hw_free =     snd_sgio2audio_pcm_hw_free,
 684         .prepare =     snd_sgio2audio_pcm_prepare,
 685         .trigger =     snd_sgio2audio_pcm_trigger,
 686         .pointer =     snd_sgio2audio_pcm_pointer,
 687         .page =        snd_pcm_lib_get_vmalloc_page,
 688         .mmap =        snd_pcm_lib_mmap_vmalloc,
 689 };
 690
 691 static struct snd_pcm_ops snd_sgio2audio_playback2_ops = {
 692         .open =        snd_sgio2audio_playback2_open,
 693         .close =       snd_sgio2audio_pcm_close,
 694         .ioctl =       snd_pcm_lib_ioctl,
 695         .hw_params =   snd_sgio2audio_pcm_hw_params,
 696         .hw_free =     snd_sgio2audio_pcm_hw_free,
 697         .prepare =     snd_sgio2audio_pcm_prepare,
 698         .trigger =     snd_sgio2audio_pcm_trigger,
 699         .pointer =     snd_sgio2audio_pcm_pointer,
 700         .page =        snd_pcm_lib_get_vmalloc_page,
 701         .mmap =        snd_pcm_lib_mmap_vmalloc,
 702 };
 703
 704 static struct snd_pcm_ops snd_sgio2audio_capture_ops = {
 705         .open =        snd_sgio2audio_capture_open,
 706         .close =       snd_sgio2audio_pcm_close,
 707         .ioctl =       snd_pcm_lib_ioctl,
 708         .hw_params =   snd_sgio2audio_pcm_hw_params,
 709         .hw_free =     snd_sgio2audio_pcm_hw_free,
 710         .prepare =     snd_sgio2audio_pcm_prepare,
 711         .trigger =     snd_sgio2audio_pcm_trigger,
 712         .pointer =     snd_sgio2audio_pcm_pointer,
 713         .page =        snd_pcm_lib_get_vmalloc_page,
 714         .mmap =        snd_pcm_lib_mmap_vmalloc,
 715 };
 716
 717 /*
 718  *  definitions of capture are omitted here...
 719  */
 720
 721 /* create a pcm device */
 722 static int snd_sgio2audio_new_pcm(struct snd_sgio2audio *chip)
 723 {
 724         struct snd_pcm *pcm;
 725         int err;
 726
 727         /* create first pcm device with one outputs and one input */
 728         err = snd_pcm_new(chip->card, "SGI O2 Audio", 0, 1, 1, &pcm);
 729         if (err < 0)
 730                 return err;
 731
 732         pcm->private_data = chip;
 733         strcpy(pcm->name, "SGI O2 DAC1");
 734
 735         /* set operators */
 736         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 737                         &snd_sgio2audio_playback1_ops);
 738         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 739                         &snd_sgio2audio_capture_ops);
 740
 741         /* create second  pcm device with one outputs and no input */
 742         err = snd_pcm_new(chip->card, "SGI O2 Audio", 1, 1, 0, &pcm);
 743         if (err < 0)
 744                 return err;
 745
 746         pcm->private_data = chip;
 747         strcpy(pcm->name, "SGI O2 DAC2");
 748
 749         /* set operators */
 750         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 751                         &snd_sgio2audio_playback2_ops);
 752
 753         return 0;
 754 }
 755
 756 static struct {
 757         int idx;
 758         int irq;
 759         irqreturn_t (*isr)(int, void *);
 760         const char *desc;
 761 } snd_sgio2_isr_table[] = {
 762         {
 763                 .idx = 0,
 764                 .irq = MACEISA_AUDIO1_DMAT_IRQ,
 765                 .isr = snd_sgio2audio_dma_in_isr,
 766                 .desc = "Capture DMA Channel 0"
 767         }, {
 768                 .idx = 0,
 769                 .irq = MACEISA_AUDIO1_OF_IRQ,
 770                 .isr = snd_sgio2audio_error_isr,
 771                 .desc = "Capture Overflow"
 772         }, {
 773                 .idx = 1,
 774                 .irq = MACEISA_AUDIO2_DMAT_IRQ,
 775                 .isr = snd_sgio2audio_dma_out_isr,
 776                 .desc = "Playback DMA Channel 1"
 777         }, {
 778                 .idx = 1,
 779                 .irq = MACEISA_AUDIO2_MERR_IRQ,
 780                 .isr = snd_sgio2audio_error_isr,
 781                 .desc = "Memory Error Channel 1"
 782         }, {
 783                 .idx = 2,
 784                 .irq = MACEISA_AUDIO3_DMAT_IRQ,
 785                 .isr = snd_sgio2audio_dma_out_isr,
 786                 .desc = "Playback DMA Channel 2"
 787         }, {
 788                 .idx = 2,
 789                 .irq = MACEISA_AUDIO3_MERR_IRQ,
 790                 .isr = snd_sgio2audio_error_isr,
 791                 .desc = "Memory Error Channel 2"
 792         }
 793 };
 794
 795 /* ALSA driver */
 796
 797 static int snd_sgio2audio_free(struct snd_sgio2audio *chip)
 798 {
 799         int i;
 800
 801         /* reset interface */
 802         writeq(AUDIO_CONTROL_RESET, &mace->perif.audio.control);
 803         udelay(1);
 804         writeq(0, &mace->perif.audio.control);
 805
 806         /* release IRQ's */
 807         for (i = 0; i < ARRAY_SIZE(snd_sgio2_isr_table); i++)
 808                 free_irq(snd_sgio2_isr_table[i].irq,
 809                          &chip->channel[snd_sgio2_isr_table[i].idx]);
 810
 811         dma_free_coherent(NULL, MACEISA_RINGBUFFERS_SIZE,
 812                           chip->ring_base, chip->ring_base_dma);
 813
 814         /* release card data */
 815         kfree(chip);
 816         return 0;
 817 }
 818
 819 static int snd_sgio2audio_dev_free(struct snd_device *device)
 820 {
 821         struct snd_sgio2audio *chip = device->device_data;
 822
 823         return snd_sgio2audio_free(chip);
 824 }
 825
 826 static struct snd_device_ops ops = {
 827         .dev_free = snd_sgio2audio_dev_free,
 828 };
 829
 830 static int snd_sgio2audio_create(struct snd_card *card,
 831                                  struct snd_sgio2audio **rchip)
 832 {
 833         struct snd_sgio2audio *chip;
 834         int i, err;
 835
 836         *rchip = NULL;
 837
 838         /* check if a codec is attached to the interface */
 839         /* (Audio or Audio/Video board present) */
 840         if (!(readq(&mace->perif.audio.control) & AUDIO_CONTROL_CODEC_PRESENT))
 841                 return -ENOENT;
 842
 843         chip = kzalloc(sizeof(struct snd_sgio2audio), GFP_KERNEL);
 844         if (chip == NULL)
 845                 return -ENOMEM;
 846
 847         chip->card = card;
 848
 849         chip->ring_base = dma_alloc_coherent(NULL, MACEISA_RINGBUFFERS_SIZE,
 850                                              &chip->ring_base_dma, GFP_USER);
 851         if (chip->ring_base == NULL) {
 852                 printk(KERN_ERR
 853                        "sgio2audio: could not allocate ring buffers\n");
 854                 kfree(chip);
 855                 return -ENOMEM;
 856         }
 857
 858         spin_lock_init(&chip->ad1843_lock);
 859
 860         /* initialize channels */
 861         for (i = 0; i < 3; i++) {
 862                 spin_lock_init(&chip->channel[i].lock);
 863                 chip->channel[i].idx = i;
 864         }
 865
 866         /* allocate IRQs */
 867         for (i = 0; i < ARRAY_SIZE(snd_sgio2_isr_table); i++) {
 868                 if (request_irq(snd_sgio2_isr_table[i].irq,
 869                                 snd_sgio2_isr_table[i].isr,
 870                                 0,
 871                                 snd_sgio2_isr_table[i].desc,
 872                                 &chip->channel[snd_sgio2_isr_table[i].idx])) {
 873                         snd_sgio2audio_free(chip);
 874                         printk(KERN_ERR "sgio2audio: cannot allocate irq %d\n",
 875                                snd_sgio2_isr_table[i].irq);
 876                         return -EBUSY;
 877                 }
 878         }
 879
 880         /* reset the interface */
 881         writeq(AUDIO_CONTROL_RESET, &mace->perif.audio.control);
 882         udelay(1);
 883         writeq(0, &mace->perif.audio.control);
 884         msleep_interruptible(1); /* give time to recover */
 885
 886         /* set ring base */
 887         writeq(chip->ring_base_dma, &mace->perif.ctrl.ringbase);
 888
 889         /* attach the AD1843 codec */
 890         chip->ad1843.read = read_ad1843_reg;
 891         chip->ad1843.write = write_ad1843_reg;
 892         chip->ad1843.chip = chip;
 893
 894         /* initialize the AD1843 codec */
 895         err = ad1843_init(&chip->ad1843);
 896         if (err < 0) {
 897                 snd_sgio2audio_free(chip);
 898                 return err;
 899         }
 900
 901         err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 902         if (err < 0) {
 903                 snd_sgio2audio_free(chip);
 904                 return err;
 905         }
 906         *rchip = chip;
 907         return 0;
 908 }
 909
 910 static int snd_sgio2audio_probe(struct platform_device *pdev)
 911 {
 912         struct snd_card *card;
 913         struct snd_sgio2audio *chip;
 914         int err;
 915
 916         err = snd_card_new(&pdev->dev, index, id, THIS_MODULE, 0, &card);
 917         if (err < 0)
 918                 return err;
 919
 920         err = snd_sgio2audio_create(card, &chip);
 921         if (err < 0) {
 922                 snd_card_free(card);
 923                 return err;
 924         }
 925
 926         err = snd_sgio2audio_new_pcm(chip);
 927         if (err < 0) {
 928                 snd_card_free(card);
 929                 return err;
 930         }
 931         err = snd_sgio2audio_new_mixer(chip);
 932         if (err < 0) {
 933                 snd_card_free(card);
 934                 return err;
 935         }
 936
 937         strcpy(card->driver, "SGI O2 Audio");
 938         strcpy(card->shortname, "SGI O2 Audio");
 939         sprintf(card->longname, "%s irq %i-%i",
 940                 card->shortname,
 941                 MACEISA_AUDIO1_DMAT_IRQ,
 942                 MACEISA_AUDIO3_MERR_IRQ);
 943
 944         err = snd_card_register(card);
 945         if (err < 0) {
 946                 snd_card_free(card);
 947                 return err;
 948         }
 949         platform_set_drvdata(pdev, card);
 950         return 0;
 951 }
 952
 953 static int snd_sgio2audio_remove(struct platform_device *pdev)
 954 {
 955         struct snd_card *card = platform_get_drvdata(pdev);
 956
 957         snd_card_free(card);
 958         return 0;
 959 }
 960
 961 static struct platform_driver sgio2audio_driver = {
 962         .probe  = snd_sgio2audio_probe,
 963         .remove = snd_sgio2audio_remove,
 964         .driver = {
 965                 .name   = "sgio2audio",
 966         }
 967 };
 968
 969 module_platform_driver(sgio2audio_driver);