linux/sound/mips/sgio2audio.c
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   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
  46MODULE_AUTHOR("Vivien Chappelier <vivien.chappelier@linux-mips.org>");
  47MODULE_DESCRIPTION("SGI O2 Audio");
  48MODULE_LICENSE("GPL");
  49MODULE_SUPPORTED_DEVICE("{{Silicon Graphics, O2 Audio}}");
  50
  51static int index = SNDRV_DEFAULT_IDX1;  /* Index 0-MAX */
  52static char *id = SNDRV_DEFAULT_STR1;   /* ID for this card */
  53
  54module_param(index, int, 0444);
  55MODULE_PARM_DESC(index, "Index value for SGI O2 soundcard.");
  56module_param(id, charp, 0444);
  57MODULE_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
  85struct 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 */
  94struct 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 */
 116static 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 */
 139static 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
 158static 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
 171static 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
 185static 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
 201static 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
 210static 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
 219static 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 */
 233static const 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 */
 245static const 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 */
 257static const 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 */
 268static const 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 */
 278static const 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 */
 290static const 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 */
 302static const 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
 313static 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 */
 358static 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 */
 406static 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
 454static 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
 475static 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
 483static 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
 503static 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
 522static 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 */
 535static const 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 */
 554static 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
 564static 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 */
 575static 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 */
 586static 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 */
 596static 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 */
 604static 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 */
 610static 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 */
 647static 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 */
 666static snd_pcm_uframes_t
 667snd_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 */
 678static const 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};
 689
 690static const struct snd_pcm_ops snd_sgio2audio_playback2_ops = {
 691        .open =        snd_sgio2audio_playback2_open,
 692        .close =       snd_sgio2audio_pcm_close,
 693        .ioctl =       snd_pcm_lib_ioctl,
 694        .hw_params =   snd_sgio2audio_pcm_hw_params,
 695        .hw_free =     snd_sgio2audio_pcm_hw_free,
 696        .prepare =     snd_sgio2audio_pcm_prepare,
 697        .trigger =     snd_sgio2audio_pcm_trigger,
 698        .pointer =     snd_sgio2audio_pcm_pointer,
 699        .page =        snd_pcm_lib_get_vmalloc_page,
 700};
 701
 702static const struct snd_pcm_ops snd_sgio2audio_capture_ops = {
 703        .open =        snd_sgio2audio_capture_open,
 704        .close =       snd_sgio2audio_pcm_close,
 705        .ioctl =       snd_pcm_lib_ioctl,
 706        .hw_params =   snd_sgio2audio_pcm_hw_params,
 707        .hw_free =     snd_sgio2audio_pcm_hw_free,
 708        .prepare =     snd_sgio2audio_pcm_prepare,
 709        .trigger =     snd_sgio2audio_pcm_trigger,
 710        .pointer =     snd_sgio2audio_pcm_pointer,
 711        .page =        snd_pcm_lib_get_vmalloc_page,
 712};
 713
 714/*
 715 *  definitions of capture are omitted here...
 716 */
 717
 718/* create a pcm device */
 719static int snd_sgio2audio_new_pcm(struct snd_sgio2audio *chip)
 720{
 721        struct snd_pcm *pcm;
 722        int err;
 723
 724        /* create first pcm device with one outputs and one input */
 725        err = snd_pcm_new(chip->card, "SGI O2 Audio", 0, 1, 1, &pcm);
 726        if (err < 0)
 727                return err;
 728
 729        pcm->private_data = chip;
 730        strcpy(pcm->name, "SGI O2 DAC1");
 731
 732        /* set operators */
 733        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 734                        &snd_sgio2audio_playback1_ops);
 735        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 736                        &snd_sgio2audio_capture_ops);
 737
 738        /* create second  pcm device with one outputs and no input */
 739        err = snd_pcm_new(chip->card, "SGI O2 Audio", 1, 1, 0, &pcm);
 740        if (err < 0)
 741                return err;
 742
 743        pcm->private_data = chip;
 744        strcpy(pcm->name, "SGI O2 DAC2");
 745
 746        /* set operators */
 747        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 748                        &snd_sgio2audio_playback2_ops);
 749
 750        return 0;
 751}
 752
 753static struct {
 754        int idx;
 755        int irq;
 756        irqreturn_t (*isr)(int, void *);
 757        const char *desc;
 758} snd_sgio2_isr_table[] = {
 759        {
 760                .idx = 0,
 761                .irq = MACEISA_AUDIO1_DMAT_IRQ,
 762                .isr = snd_sgio2audio_dma_in_isr,
 763                .desc = "Capture DMA Channel 0"
 764        }, {
 765                .idx = 0,
 766                .irq = MACEISA_AUDIO1_OF_IRQ,
 767                .isr = snd_sgio2audio_error_isr,
 768                .desc = "Capture Overflow"
 769        }, {
 770                .idx = 1,
 771                .irq = MACEISA_AUDIO2_DMAT_IRQ,
 772                .isr = snd_sgio2audio_dma_out_isr,
 773                .desc = "Playback DMA Channel 1"
 774        }, {
 775                .idx = 1,
 776                .irq = MACEISA_AUDIO2_MERR_IRQ,
 777                .isr = snd_sgio2audio_error_isr,
 778                .desc = "Memory Error Channel 1"
 779        }, {
 780                .idx = 2,
 781                .irq = MACEISA_AUDIO3_DMAT_IRQ,
 782                .isr = snd_sgio2audio_dma_out_isr,
 783                .desc = "Playback DMA Channel 2"
 784        }, {
 785                .idx = 2,
 786                .irq = MACEISA_AUDIO3_MERR_IRQ,
 787                .isr = snd_sgio2audio_error_isr,
 788                .desc = "Memory Error Channel 2"
 789        }
 790};
 791
 792/* ALSA driver */
 793
 794static int snd_sgio2audio_free(struct snd_sgio2audio *chip)
 795{
 796        int i;
 797
 798        /* reset interface */
 799        writeq(AUDIO_CONTROL_RESET, &mace->perif.audio.control);
 800        udelay(1);
 801        writeq(0, &mace->perif.audio.control);
 802
 803        /* release IRQ's */
 804        for (i = 0; i < ARRAY_SIZE(snd_sgio2_isr_table); i++)
 805                free_irq(snd_sgio2_isr_table[i].irq,
 806                         &chip->channel[snd_sgio2_isr_table[i].idx]);
 807
 808        dma_free_coherent(NULL, MACEISA_RINGBUFFERS_SIZE,
 809                          chip->ring_base, chip->ring_base_dma);
 810
 811        /* release card data */
 812        kfree(chip);
 813        return 0;
 814}
 815
 816static int snd_sgio2audio_dev_free(struct snd_device *device)
 817{
 818        struct snd_sgio2audio *chip = device->device_data;
 819
 820        return snd_sgio2audio_free(chip);
 821}
 822
 823static struct snd_device_ops ops = {
 824        .dev_free = snd_sgio2audio_dev_free,
 825};
 826
 827static int snd_sgio2audio_create(struct snd_card *card,
 828                                 struct snd_sgio2audio **rchip)
 829{
 830        struct snd_sgio2audio *chip;
 831        int i, err;
 832
 833        *rchip = NULL;
 834
 835        /* check if a codec is attached to the interface */
 836        /* (Audio or Audio/Video board present) */
 837        if (!(readq(&mace->perif.audio.control) & AUDIO_CONTROL_CODEC_PRESENT))
 838                return -ENOENT;
 839
 840        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 841        if (chip == NULL)
 842                return -ENOMEM;
 843
 844        chip->card = card;
 845
 846        chip->ring_base = dma_alloc_coherent(NULL, MACEISA_RINGBUFFERS_SIZE,
 847                                             &chip->ring_base_dma, GFP_USER);
 848        if (chip->ring_base == NULL) {
 849                printk(KERN_ERR
 850                       "sgio2audio: could not allocate ring buffers\n");
 851                kfree(chip);
 852                return -ENOMEM;
 853        }
 854
 855        spin_lock_init(&chip->ad1843_lock);
 856
 857        /* initialize channels */
 858        for (i = 0; i < 3; i++) {
 859                spin_lock_init(&chip->channel[i].lock);
 860                chip->channel[i].idx = i;
 861        }
 862
 863        /* allocate IRQs */
 864        for (i = 0; i < ARRAY_SIZE(snd_sgio2_isr_table); i++) {
 865                if (request_irq(snd_sgio2_isr_table[i].irq,
 866                                snd_sgio2_isr_table[i].isr,
 867                                0,
 868                                snd_sgio2_isr_table[i].desc,
 869                                &chip->channel[snd_sgio2_isr_table[i].idx])) {
 870                        snd_sgio2audio_free(chip);
 871                        printk(KERN_ERR "sgio2audio: cannot allocate irq %d\n",
 872                               snd_sgio2_isr_table[i].irq);
 873                        return -EBUSY;
 874                }
 875        }
 876
 877        /* reset the interface */
 878        writeq(AUDIO_CONTROL_RESET, &mace->perif.audio.control);
 879        udelay(1);
 880        writeq(0, &mace->perif.audio.control);
 881        msleep_interruptible(1); /* give time to recover */
 882
 883        /* set ring base */
 884        writeq(chip->ring_base_dma, &mace->perif.ctrl.ringbase);
 885
 886        /* attach the AD1843 codec */
 887        chip->ad1843.read = read_ad1843_reg;
 888        chip->ad1843.write = write_ad1843_reg;
 889        chip->ad1843.chip = chip;
 890
 891        /* initialize the AD1843 codec */
 892        err = ad1843_init(&chip->ad1843);
 893        if (err < 0) {
 894                snd_sgio2audio_free(chip);
 895                return err;
 896        }
 897
 898        err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
 899        if (err < 0) {
 900                snd_sgio2audio_free(chip);
 901                return err;
 902        }
 903        *rchip = chip;
 904        return 0;
 905}
 906
 907static int snd_sgio2audio_probe(struct platform_device *pdev)
 908{
 909        struct snd_card *card;
 910        struct snd_sgio2audio *chip;
 911        int err;
 912
 913        err = snd_card_new(&pdev->dev, index, id, THIS_MODULE, 0, &card);
 914        if (err < 0)
 915                return err;
 916
 917        err = snd_sgio2audio_create(card, &chip);
 918        if (err < 0) {
 919                snd_card_free(card);
 920                return err;
 921        }
 922
 923        err = snd_sgio2audio_new_pcm(chip);
 924        if (err < 0) {
 925                snd_card_free(card);
 926                return err;
 927        }
 928        err = snd_sgio2audio_new_mixer(chip);
 929        if (err < 0) {
 930                snd_card_free(card);
 931                return err;
 932        }
 933
 934        strcpy(card->driver, "SGI O2 Audio");
 935        strcpy(card->shortname, "SGI O2 Audio");
 936        sprintf(card->longname, "%s irq %i-%i",
 937                card->shortname,
 938                MACEISA_AUDIO1_DMAT_IRQ,
 939                MACEISA_AUDIO3_MERR_IRQ);
 940
 941        err = snd_card_register(card);
 942        if (err < 0) {
 943                snd_card_free(card);
 944                return err;
 945        }
 946        platform_set_drvdata(pdev, card);
 947        return 0;
 948}
 949
 950static int snd_sgio2audio_remove(struct platform_device *pdev)
 951{
 952        struct snd_card *card = platform_get_drvdata(pdev);
 953
 954        snd_card_free(card);
 955        return 0;
 956}
 957
 958static struct platform_driver sgio2audio_driver = {
 959        .probe  = snd_sgio2audio_probe,
 960        .remove = snd_sgio2audio_remove,
 961        .driver = {
 962                .name   = "sgio2audio",
 963        }
 964};
 965
 966module_platform_driver(sgio2audio_driver);
 967