sound/sh/aica.c

   1 /*
   2 * This code is licenced under
   3 * the General Public Licence
   4 * version 2
   5 *
   6 * Copyright Adrian McMenamin 2005, 2006, 2007
   7 * <adrian@mcmen.demon.co.uk>
   8 * Requires firmware (BSD licenced) available from:
   9 * http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/
  10 * or the maintainer
  11 *
  12 * This program is free software; you can redistribute it and/or modify
  13 * it under the terms of version 2 of the GNU General Public License as published by
  14 * the Free Software Foundation.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  24 *
  25 */
  26
  27 #include <linux/init.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/slab.h>
  30 #include <linux/time.h>
  31 #include <linux/wait.h>
  32 #include <linux/moduleparam.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/firmware.h>
  35 #include <linux/timer.h>
  36 #include <linux/delay.h>
  37 #include <linux/workqueue.h>
  38 #include <sound/driver.h>
  39 #include <sound/core.h>
  40 #include <sound/control.h>
  41 #include <sound/pcm.h>
  42 #include <sound/initval.h>
  43 #include <sound/info.h>
  44 #include <asm/io.h>
  45 #include <asm/dma.h>
  46 #include <asm/dreamcast/sysasic.h>
  47 #include "aica.h"
  48
  49 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
  50 MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
  51 MODULE_LICENSE("GPL");
  52 MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
  53
  54 /* module parameters */
  55 #define CARD_NAME "AICA"
  56 static int index = -1;
  57 static char *id;
  58 static int enable = 1;
  59 module_param(index, int, 0444);
  60 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
  61 module_param(id, charp, 0444);
  62 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
  63 module_param(enable, bool, 0644);
  64 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
  65
  66 /* Use workqueue */
  67 static struct workqueue_struct *aica_queue;
  68
  69 /* Simple platform device */
  70 static struct platform_device *pd;
  71 static struct resource aica_memory_space[2] = {
  72         {
  73          .name = "AICA ARM CONTROL",
  74          .start = ARM_RESET_REGISTER,
  75          .flags = IORESOURCE_MEM,
  76          .end = ARM_RESET_REGISTER + 3,
  77          },
  78         {
  79          .name = "AICA Sound RAM",
  80          .start = SPU_MEMORY_BASE,
  81          .flags = IORESOURCE_MEM,
  82          .end = SPU_MEMORY_BASE + 0x200000 - 1,
  83          },
  84 };
  85
  86 /* SPU specific functions */
  87 /* spu_write_wait - wait for G2-SH FIFO to clear */
  88 static void spu_write_wait(void)
  89 {
  90         int time_count;
  91         time_count = 0;
  92         while (1) {
  93                 if (!(readl(G2_FIFO) & 0x11))
  94                         break;
  95                 /* To ensure hardware failure doesn't wedge kernel */
  96                 time_count++;
  97                 if (time_count > 0x10000) {
  98                         snd_printk
  99                             ("WARNING: G2 FIFO appears to be blocked.\n");
 100                         break;
 101                 }
 102         }
 103 }
 104
 105 /* spu_memset - write to memory in SPU address space */
 106 static void spu_memset(u32 toi, u32 what, int length)
 107 {
 108         int i;
 109         snd_assert(length % 4 == 0, return);
 110         for (i = 0; i < length; i++) {
 111                 if (!(i % 8))
 112                         spu_write_wait();
 113                 writel(what, toi + SPU_MEMORY_BASE);
 114                 toi++;
 115         }
 116 }
 117
 118 /* spu_memload - write to SPU address space */
 119 static void spu_memload(u32 toi, void *from, int length)
 120 {
 121         u32 *froml = from;
 122         u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
 123         int i;
 124         u32 val;
 125         length = DIV_ROUND_UP(length, 4);
 126         spu_write_wait();
 127         for (i = 0; i < length; i++) {
 128                 if (!(i % 8))
 129                         spu_write_wait();
 130                 val = *froml;
 131                 writel(val, to);
 132                 froml++;
 133                 to++;
 134         }
 135 }
 136
 137 /* spu_disable - set spu registers to stop sound output */
 138 static void spu_disable(void)
 139 {
 140         int i;
 141         u32 regval;
 142         spu_write_wait();
 143         regval = readl(ARM_RESET_REGISTER);
 144         regval |= 1;
 145         spu_write_wait();
 146         writel(regval, ARM_RESET_REGISTER);
 147         for (i = 0; i < 64; i++) {
 148                 spu_write_wait();
 149                 regval = readl(SPU_REGISTER_BASE + (i * 0x80));
 150                 regval = (regval & ~0x4000) | 0x8000;
 151                 spu_write_wait();
 152                 writel(regval, SPU_REGISTER_BASE + (i * 0x80));
 153         }
 154 }
 155
 156 /* spu_enable - set spu registers to enable sound output */
 157 static void spu_enable(void)
 158 {
 159         u32 regval = readl(ARM_RESET_REGISTER);
 160         regval &= ~1;
 161         spu_write_wait();
 162         writel(regval, ARM_RESET_REGISTER);
 163 }
 164
 165 /*
 166  * Halt the sound processor, clear the memory,
 167  * load some default ARM7 code, and then restart ARM7
 168 */
 169 static void spu_reset(void)
 170 {
 171         spu_disable();
 172         spu_memset(0, 0, 0x200000 / 4);
 173         /* Put ARM7 in endless loop */
 174         ctrl_outl(0xea000002, SPU_MEMORY_BASE);
 175         spu_enable();
 176 }
 177
 178 /* aica_chn_start - write to spu to start playback */
 179 static void aica_chn_start(void)
 180 {
 181         spu_write_wait();
 182         writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
 183 }
 184
 185 /* aica_chn_halt - write to spu to halt playback */
 186 static void aica_chn_halt(void)
 187 {
 188         spu_write_wait();
 189         writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
 190 }
 191
 192 /* ALSA code below */
 193 static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
 194         .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
 195         .formats =
 196             (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
 197              SNDRV_PCM_FMTBIT_IMA_ADPCM),
 198         .rates = SNDRV_PCM_RATE_8000_48000,
 199         .rate_min = 8000,
 200         .rate_max = 48000,
 201         .channels_min = 1,
 202         .channels_max = 2,
 203         .buffer_bytes_max = AICA_BUFFER_SIZE,
 204         .period_bytes_min = AICA_PERIOD_SIZE,
 205         .period_bytes_max = AICA_PERIOD_SIZE,
 206         .periods_min = AICA_PERIOD_NUMBER,
 207         .periods_max = AICA_PERIOD_NUMBER,
 208 };
 209
 210 static int aica_dma_transfer(int channels, int buffer_size,
 211                              struct snd_pcm_substream *substream)
 212 {
 213         int q, err, period_offset;
 214         struct snd_card_aica *dreamcastcard;
 215         struct snd_pcm_runtime *runtime;
 216         err = 0;
 217         dreamcastcard = substream->pcm->private_data;
 218         period_offset = dreamcastcard->clicks;
 219         period_offset %= (AICA_PERIOD_NUMBER / channels);
 220         runtime = substream->runtime;
 221         for (q = 0; q < channels; q++) {
 222                 err = dma_xfer(AICA_DMA_CHANNEL,
 223                                (unsigned long) (runtime->dma_area +
 224                                                 (AICA_BUFFER_SIZE * q) /
 225                                                 channels +
 226                                                 AICA_PERIOD_SIZE *
 227                                                 period_offset),
 228                                AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
 229                                AICA_PERIOD_SIZE * period_offset,
 230                                buffer_size / channels, AICA_DMA_MODE);
 231                 if (unlikely(err < 0))
 232                         break;
 233                 dma_wait_for_completion(AICA_DMA_CHANNEL);
 234         }
 235         return err;
 236 }
 237
 238 static void startup_aica(struct snd_card_aica *dreamcastcard)
 239 {
 240         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
 241                     dreamcastcard->channel, sizeof(struct aica_channel));
 242         aica_chn_start();
 243 }
 244
 245 static void run_spu_dma(struct work_struct *work)
 246 {
 247         int buffer_size;
 248         struct snd_pcm_runtime *runtime;
 249         struct snd_card_aica *dreamcastcard;
 250         dreamcastcard =
 251             container_of(work, struct snd_card_aica, spu_dma_work);
 252         runtime = dreamcastcard->substream->runtime;
 253         if (unlikely(dreamcastcard->dma_check == 0)) {
 254                 buffer_size =
 255                     frames_to_bytes(runtime, runtime->buffer_size);
 256                 if (runtime->channels > 1)
 257                         dreamcastcard->channel->flags |= 0x01;
 258                 aica_dma_transfer(runtime->channels, buffer_size,
 259                                   dreamcastcard->substream);
 260                 startup_aica(dreamcastcard);
 261                 dreamcastcard->clicks =
 262                     buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
 263                 return;
 264         } else {
 265                 aica_dma_transfer(runtime->channels,
 266                                   AICA_PERIOD_SIZE * runtime->channels,
 267                                   dreamcastcard->substream);
 268                 snd_pcm_period_elapsed(dreamcastcard->substream);
 269                 dreamcastcard->clicks++;
 270                 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
 271                         dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
 272                 mod_timer(&dreamcastcard->timer, jiffies + 1);
 273         }
 274 }
 275
 276 static void aica_period_elapsed(unsigned long timer_var)
 277 {
 278         /*timer function - so cannot sleep */
 279         int play_period;
 280         struct snd_pcm_runtime *runtime;
 281         struct snd_pcm_substream *substream;
 282         struct snd_card_aica *dreamcastcard;
 283         substream = (struct snd_pcm_substream *) timer_var;
 284         runtime = substream->runtime;
 285         dreamcastcard = substream->pcm->private_data;
 286         /* Have we played out an additional period? */
 287         play_period =
 288             frames_to_bytes(runtime,
 289                             readl
 290                             (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
 291             AICA_PERIOD_SIZE;
 292         if (play_period == dreamcastcard->current_period) {
 293                 /* reschedule the timer */
 294                 mod_timer(&(dreamcastcard->timer), jiffies + 1);
 295                 return;
 296         }
 297         if (runtime->channels > 1)
 298                 dreamcastcard->current_period = play_period;
 299         if (unlikely(dreamcastcard->dma_check == 0))
 300                 dreamcastcard->dma_check = 1;
 301         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
 302 }
 303
 304 static void spu_begin_dma(struct snd_pcm_substream *substream)
 305 {
 306         struct snd_card_aica *dreamcastcard;
 307         struct snd_pcm_runtime *runtime;
 308         runtime = substream->runtime;
 309         dreamcastcard = substream->pcm->private_data;
 310         /*get the queue to do the work */
 311         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
 312         /* Timer may already be running */
 313         if (unlikely(dreamcastcard->timer.data)) {
 314                 mod_timer(&dreamcastcard->timer, jiffies + 4);
 315                 return;
 316         }
 317         init_timer(&(dreamcastcard->timer));
 318         dreamcastcard->timer.data = (unsigned long) substream;
 319         dreamcastcard->timer.function = aica_period_elapsed;
 320         dreamcastcard->timer.expires = jiffies + 4;
 321         add_timer(&(dreamcastcard->timer));
 322 }
 323
 324 static int snd_aicapcm_pcm_open(struct snd_pcm_substream
 325                                 *substream)
 326 {
 327         struct snd_pcm_runtime *runtime;
 328         struct aica_channel *channel;
 329         struct snd_card_aica *dreamcastcard;
 330         if (!enable)
 331                 return -ENOENT;
 332         dreamcastcard = substream->pcm->private_data;
 333         channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
 334         if (!channel)
 335                 return -ENOMEM;
 336         /* set defaults for channel */
 337         channel->sfmt = SM_8BIT;
 338         channel->cmd = AICA_CMD_START;
 339         channel->vol = dreamcastcard->master_volume;
 340         channel->pan = 0x80;
 341         channel->pos = 0;
 342         channel->flags = 0;     /* default to mono */
 343         dreamcastcard->channel = channel;
 344         runtime = substream->runtime;
 345         runtime->hw = snd_pcm_aica_playback_hw;
 346         spu_enable();
 347         dreamcastcard->clicks = 0;
 348         dreamcastcard->current_period = 0;
 349         dreamcastcard->dma_check = 0;
 350         return 0;
 351 }
 352
 353 static int snd_aicapcm_pcm_close(struct snd_pcm_substream
 354                                  *substream)
 355 {
 356         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
 357         flush_workqueue(aica_queue);
 358         if (dreamcastcard->timer.data)
 359                 del_timer(&dreamcastcard->timer);
 360         kfree(dreamcastcard->channel);
 361         spu_disable();
 362         return 0;
 363 }
 364
 365 static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
 366                                    *substream)
 367 {
 368         /* Free the DMA buffer */
 369         return snd_pcm_lib_free_pages(substream);
 370 }
 371
 372 static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
 373                                      *substream, struct snd_pcm_hw_params
 374                                      *hw_params)
 375 {
 376         /* Allocate a DMA buffer using ALSA built-ins */
 377         return
 378             snd_pcm_lib_malloc_pages(substream,
 379                                      params_buffer_bytes(hw_params));
 380 }
 381
 382 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
 383                                    *substream)
 384 {
 385         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
 386         if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
 387                 dreamcastcard->channel->sfmt = SM_16BIT;
 388         dreamcastcard->channel->freq = substream->runtime->rate;
 389         dreamcastcard->substream = substream;
 390         return 0;
 391 }
 392
 393 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
 394                                    *substream, int cmd)
 395 {
 396         switch (cmd) {
 397         case SNDRV_PCM_TRIGGER_START:
 398                 spu_begin_dma(substream);
 399                 break;
 400         case SNDRV_PCM_TRIGGER_STOP:
 401                 aica_chn_halt();
 402                 break;
 403         default:
 404                 return -EINVAL;
 405         }
 406         return 0;
 407 }
 408
 409 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
 410                                              *substream)
 411 {
 412         return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
 413 }
 414
 415 static struct snd_pcm_ops snd_aicapcm_playback_ops = {
 416         .open = snd_aicapcm_pcm_open,
 417         .close = snd_aicapcm_pcm_close,
 418         .ioctl = snd_pcm_lib_ioctl,
 419         .hw_params = snd_aicapcm_pcm_hw_params,
 420         .hw_free = snd_aicapcm_pcm_hw_free,
 421         .prepare = snd_aicapcm_pcm_prepare,
 422         .trigger = snd_aicapcm_pcm_trigger,
 423         .pointer = snd_aicapcm_pcm_pointer,
 424 };
 425
 426 /* TO DO: set up to handle more than one pcm instance */
 427 static int __init snd_aicapcmchip(struct snd_card_aica
 428                                   *dreamcastcard, int pcm_index)
 429 {
 430         struct snd_pcm *pcm;
 431         int err;
 432         /* AICA has no capture ability */
 433         err =
 434             snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
 435                         &pcm);
 436         if (unlikely(err < 0))
 437                 return err;
 438         pcm->private_data = dreamcastcard;
 439         strcpy(pcm->name, "AICA PCM");
 440         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 441                         &snd_aicapcm_playback_ops);
 442         /* Allocate the DMA buffers */
 443         err =
 444             snd_pcm_lib_preallocate_pages_for_all(pcm,
 445                                                   SNDRV_DMA_TYPE_CONTINUOUS,
 446                                                   snd_dma_continuous_data
 447                                                   (GFP_KERNEL),
 448                                                   AICA_BUFFER_SIZE,
 449                                                   AICA_BUFFER_SIZE);
 450         return err;
 451 }
 452
 453 /* Mixer controls */
 454 #define aica_pcmswitch_info             snd_ctl_boolean_mono_info
 455
 456 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
 457                               struct snd_ctl_elem_value *ucontrol)
 458 {
 459         ucontrol->value.integer.value[0] = 1;   /* TO DO: Fix me */
 460         return 0;
 461 }
 462
 463 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
 464                               struct snd_ctl_elem_value *ucontrol)
 465 {
 466         if (ucontrol->value.integer.value[0] == 1)
 467                 return 0;       /* TO DO: Fix me */
 468         else
 469                 aica_chn_halt();
 470         return 0;
 471 }
 472
 473 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
 474                                struct snd_ctl_elem_info *uinfo)
 475 {
 476         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 477         uinfo->count = 1;
 478         uinfo->value.integer.min = 0;
 479         uinfo->value.integer.max = 0xFF;
 480         return 0;
 481 }
 482
 483 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
 484                               struct snd_ctl_elem_value *ucontrol)
 485 {
 486         struct snd_card_aica *dreamcastcard;
 487         dreamcastcard = kcontrol->private_data;
 488         if (unlikely(!dreamcastcard->channel))
 489                 return -ETXTBSY;        /* we've not yet been set up */
 490         ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
 491         return 0;
 492 }
 493
 494 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
 495                               struct snd_ctl_elem_value *ucontrol)
 496 {
 497         struct snd_card_aica *dreamcastcard;
 498         dreamcastcard = kcontrol->private_data;
 499         if (unlikely(!dreamcastcard->channel))
 500                 return -ETXTBSY;
 501         if (unlikely(dreamcastcard->channel->vol ==
 502                      ucontrol->value.integer.value[0]))
 503                 return 0;
 504         dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
 505         dreamcastcard->master_volume = ucontrol->value.integer.value[0];
 506         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
 507                     dreamcastcard->channel, sizeof(struct aica_channel));
 508         return 1;
 509 }
 510
 511 static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
 512         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 513         .name = "PCM Playback Switch",
 514         .index = 0,
 515         .info = aica_pcmswitch_info,
 516         .get = aica_pcmswitch_get,
 517         .put = aica_pcmswitch_put
 518 };
 519
 520 static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
 521         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 522         .name = "PCM Playback Volume",
 523         .index = 0,
 524         .info = aica_pcmvolume_info,
 525         .get = aica_pcmvolume_get,
 526         .put = aica_pcmvolume_put
 527 };
 528
 529 static int load_aica_firmware(void)
 530 {
 531         int err;
 532         const struct firmware *fw_entry;
 533         spu_reset();
 534         err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
 535         if (unlikely(err))
 536                 return err;
 537         /* write firware into memory */
 538         spu_disable();
 539         spu_memload(0, fw_entry->data, fw_entry->size);
 540         spu_enable();
 541         release_firmware(fw_entry);
 542         return err;
 543 }
 544
 545 static int __devinit add_aicamixer_controls(struct snd_card_aica
 546                                             *dreamcastcard)
 547 {
 548         int err;
 549         err = snd_ctl_add
 550             (dreamcastcard->card,
 551              snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
 552         if (unlikely(err < 0))
 553                 return err;
 554         err = snd_ctl_add
 555             (dreamcastcard->card,
 556              snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
 557         if (unlikely(err < 0))
 558                 return err;
 559         return 0;
 560 }
 561
 562 static int snd_aica_remove(struct platform_device *devptr)
 563 {
 564         struct snd_card_aica *dreamcastcard;
 565         dreamcastcard = platform_get_drvdata(devptr);
 566         if (unlikely(!dreamcastcard))
 567                 return -ENODEV;
 568         snd_card_free(dreamcastcard->card);
 569         kfree(dreamcastcard);
 570         platform_set_drvdata(devptr, NULL);
 571         return 0;
 572 }
 573
 574 static int __init snd_aica_probe(struct platform_device *devptr)
 575 {
 576         int err;
 577         struct snd_card_aica *dreamcastcard;
 578         dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
 579         if (unlikely(!dreamcastcard))
 580                 return -ENOMEM;
 581         dreamcastcard->card =
 582             snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
 583         if (unlikely(!dreamcastcard->card)) {
 584                 kfree(dreamcastcard);
 585                 return -ENODEV;
 586         }
 587         strcpy(dreamcastcard->card->driver, "snd_aica");
 588         strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
 589         strcpy(dreamcastcard->card->longname,
 590                "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
 591         /* Prepare to use the queue */
 592         INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
 593         /* Load the PCM 'chip' */
 594         err = snd_aicapcmchip(dreamcastcard, 0);
 595         if (unlikely(err < 0))
 596                 goto freedreamcast;
 597         snd_card_set_dev(dreamcastcard->card, &devptr->dev);
 598         dreamcastcard->timer.data = 0;
 599         dreamcastcard->channel = NULL;
 600         /* Add basic controls */
 601         err = add_aicamixer_controls(dreamcastcard);
 602         if (unlikely(err < 0))
 603                 goto freedreamcast;
 604         /* Register the card with ALSA subsystem */
 605         err = snd_card_register(dreamcastcard->card);
 606         if (unlikely(err < 0))
 607                 goto freedreamcast;
 608         platform_set_drvdata(devptr, dreamcastcard);
 609         aica_queue = create_workqueue(CARD_NAME);
 610         if (unlikely(!aica_queue))
 611                 goto freedreamcast;
 612         snd_printk
 613             ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
 614         return 0;
 615       freedreamcast:
 616         snd_card_free(dreamcastcard->card);
 617         kfree(dreamcastcard);
 618         return err;
 619 }
 620
 621 static struct platform_driver snd_aica_driver = {
 622         .probe = snd_aica_probe,
 623         .remove = snd_aica_remove,
 624         .driver = {
 625                    .name = SND_AICA_DRIVER},
 626 };
 627
 628 static int __init aica_init(void)
 629 {
 630         int err;
 631         err = platform_driver_register(&snd_aica_driver);
 632         if (unlikely(err < 0))
 633                 return err;
 634         pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
 635                                              aica_memory_space, 2);
 636         if (unlikely(IS_ERR(pd))) {
 637                 platform_driver_unregister(&snd_aica_driver);
 638                 return PTR_ERR(pd);
 639         }
 640         /* Load the firmware */
 641         return load_aica_firmware();
 642 }
 643
 644 static void __exit aica_exit(void)
 645 {
 646         /* Destroy the aica kernel thread            *
 647          * being extra cautious to check if it exists*/
 648         if (likely(aica_queue))
 649                 destroy_workqueue(aica_queue);
 650         platform_device_unregister(pd);
 651         platform_driver_unregister(&snd_aica_driver);
 652         /* Kill any sound still playing and reset ARM7 to safe state */
 653         spu_reset();
 654 }
 655
 656 module_init(aica_init);
 657 module_exit(aica_exit);