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/module.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 <linux/io.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/dma.h>
  45 #include <mach/sysasic.h>
  46 #include "aica.h"
  47
  48 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
  49 MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
  50 MODULE_LICENSE("GPL");
  51 MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
  52 MODULE_FIRMWARE("aica_firmware.bin");
  53
  54 /* module parameters */
  55 #define CARD_NAME "AICA"
  56 static int index = -1;
  57 static char *id;
  58 static bool 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 /* Simple platform device */
  67 static struct platform_device *pd;
  68 static struct resource aica_memory_space[2] = {
  69         {
  70          .name = "AICA ARM CONTROL",
  71          .start = ARM_RESET_REGISTER,
  72          .flags = IORESOURCE_MEM,
  73          .end = ARM_RESET_REGISTER + 3,
  74          },
  75         {
  76          .name = "AICA Sound RAM",
  77          .start = SPU_MEMORY_BASE,
  78          .flags = IORESOURCE_MEM,
  79          .end = SPU_MEMORY_BASE + 0x200000 - 1,
  80          },
  81 };
  82
  83 /* SPU specific functions */
  84 /* spu_write_wait - wait for G2-SH FIFO to clear */
  85 static void spu_write_wait(void)
  86 {
  87         int time_count;
  88         time_count = 0;
  89         while (1) {
  90                 if (!(readl(G2_FIFO) & 0x11))
  91                         break;
  92                 /* To ensure hardware failure doesn't wedge kernel */
  93                 time_count++;
  94                 if (time_count > 0x10000) {
  95                         snd_printk
  96                             ("WARNING: G2 FIFO appears to be blocked.\n");
  97                         break;
  98                 }
  99         }
 100 }
 101
 102 /* spu_memset - write to memory in SPU address space */
 103 static void spu_memset(u32 toi, u32 what, int length)
 104 {
 105         int i;
 106         unsigned long flags;
 107         if (snd_BUG_ON(length % 4))
 108                 return;
 109         for (i = 0; i < length; i++) {
 110                 if (!(i % 8))
 111                         spu_write_wait();
 112                 local_irq_save(flags);
 113                 writel(what, toi + SPU_MEMORY_BASE);
 114                 local_irq_restore(flags);
 115                 toi++;
 116         }
 117 }
 118
 119 /* spu_memload - write to SPU address space */
 120 static void spu_memload(u32 toi, void *from, int length)
 121 {
 122         unsigned long flags;
 123         u32 *froml = from;
 124         u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
 125         int i;
 126         u32 val;
 127         length = DIV_ROUND_UP(length, 4);
 128         spu_write_wait();
 129         for (i = 0; i < length; i++) {
 130                 if (!(i % 8))
 131                         spu_write_wait();
 132                 val = *froml;
 133                 local_irq_save(flags);
 134                 writel(val, to);
 135                 local_irq_restore(flags);
 136                 froml++;
 137                 to++;
 138         }
 139 }
 140
 141 /* spu_disable - set spu registers to stop sound output */
 142 static void spu_disable(void)
 143 {
 144         int i;
 145         unsigned long flags;
 146         u32 regval;
 147         spu_write_wait();
 148         regval = readl(ARM_RESET_REGISTER);
 149         regval |= 1;
 150         spu_write_wait();
 151         local_irq_save(flags);
 152         writel(regval, ARM_RESET_REGISTER);
 153         local_irq_restore(flags);
 154         for (i = 0; i < 64; i++) {
 155                 spu_write_wait();
 156                 regval = readl(SPU_REGISTER_BASE + (i * 0x80));
 157                 regval = (regval & ~0x4000) | 0x8000;
 158                 spu_write_wait();
 159                 local_irq_save(flags);
 160                 writel(regval, SPU_REGISTER_BASE + (i * 0x80));
 161                 local_irq_restore(flags);
 162         }
 163 }
 164
 165 /* spu_enable - set spu registers to enable sound output */
 166 static void spu_enable(void)
 167 {
 168         unsigned long flags;
 169         u32 regval = readl(ARM_RESET_REGISTER);
 170         regval &= ~1;
 171         spu_write_wait();
 172         local_irq_save(flags);
 173         writel(regval, ARM_RESET_REGISTER);
 174         local_irq_restore(flags);
 175 }
 176
 177 /*
 178  * Halt the sound processor, clear the memory,
 179  * load some default ARM7 code, and then restart ARM7
 180 */
 181 static void spu_reset(void)
 182 {
 183         unsigned long flags;
 184         spu_disable();
 185         spu_memset(0, 0, 0x200000 / 4);
 186         /* Put ARM7 in endless loop */
 187         local_irq_save(flags);
 188         __raw_writel(0xea000002, SPU_MEMORY_BASE);
 189         local_irq_restore(flags);
 190         spu_enable();
 191 }
 192
 193 /* aica_chn_start - write to spu to start playback */
 194 static void aica_chn_start(void)
 195 {
 196         unsigned long flags;
 197         spu_write_wait();
 198         local_irq_save(flags);
 199         writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
 200         local_irq_restore(flags);
 201 }
 202
 203 /* aica_chn_halt - write to spu to halt playback */
 204 static void aica_chn_halt(void)
 205 {
 206         unsigned long flags;
 207         spu_write_wait();
 208         local_irq_save(flags);
 209         writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
 210         local_irq_restore(flags);
 211 }
 212
 213 /* ALSA code below */
 214 static const struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
 215         .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
 216         .formats =
 217             (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
 218              SNDRV_PCM_FMTBIT_IMA_ADPCM),
 219         .rates = SNDRV_PCM_RATE_8000_48000,
 220         .rate_min = 8000,
 221         .rate_max = 48000,
 222         .channels_min = 1,
 223         .channels_max = 2,
 224         .buffer_bytes_max = AICA_BUFFER_SIZE,
 225         .period_bytes_min = AICA_PERIOD_SIZE,
 226         .period_bytes_max = AICA_PERIOD_SIZE,
 227         .periods_min = AICA_PERIOD_NUMBER,
 228         .periods_max = AICA_PERIOD_NUMBER,
 229 };
 230
 231 static int aica_dma_transfer(int channels, int buffer_size,
 232                              struct snd_pcm_substream *substream)
 233 {
 234         int q, err, period_offset;
 235         struct snd_card_aica *dreamcastcard;
 236         struct snd_pcm_runtime *runtime;
 237         unsigned long flags;
 238         err = 0;
 239         dreamcastcard = substream->pcm->private_data;
 240         period_offset = dreamcastcard->clicks;
 241         period_offset %= (AICA_PERIOD_NUMBER / channels);
 242         runtime = substream->runtime;
 243         for (q = 0; q < channels; q++) {
 244                 local_irq_save(flags);
 245                 err = dma_xfer(AICA_DMA_CHANNEL,
 246                                (unsigned long) (runtime->dma_area +
 247                                                 (AICA_BUFFER_SIZE * q) /
 248                                                 channels +
 249                                                 AICA_PERIOD_SIZE *
 250                                                 period_offset),
 251                                AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
 252                                AICA_PERIOD_SIZE * period_offset,
 253                                buffer_size / channels, AICA_DMA_MODE);
 254                 if (unlikely(err < 0)) {
 255                         local_irq_restore(flags);
 256                         break;
 257                 }
 258                 dma_wait_for_completion(AICA_DMA_CHANNEL);
 259                 local_irq_restore(flags);
 260         }
 261         return err;
 262 }
 263
 264 static void startup_aica(struct snd_card_aica *dreamcastcard)
 265 {
 266         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
 267                     dreamcastcard->channel, sizeof(struct aica_channel));
 268         aica_chn_start();
 269 }
 270
 271 static void run_spu_dma(struct work_struct *work)
 272 {
 273         int buffer_size;
 274         struct snd_pcm_runtime *runtime;
 275         struct snd_card_aica *dreamcastcard;
 276         dreamcastcard =
 277             container_of(work, struct snd_card_aica, spu_dma_work);
 278         runtime = dreamcastcard->substream->runtime;
 279         if (unlikely(dreamcastcard->dma_check == 0)) {
 280                 buffer_size =
 281                     frames_to_bytes(runtime, runtime->buffer_size);
 282                 if (runtime->channels > 1)
 283                         dreamcastcard->channel->flags |= 0x01;
 284                 aica_dma_transfer(runtime->channels, buffer_size,
 285                                   dreamcastcard->substream);
 286                 startup_aica(dreamcastcard);
 287                 dreamcastcard->clicks =
 288                     buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
 289                 return;
 290         } else {
 291                 aica_dma_transfer(runtime->channels,
 292                                   AICA_PERIOD_SIZE * runtime->channels,
 293                                   dreamcastcard->substream);
 294                 snd_pcm_period_elapsed(dreamcastcard->substream);
 295                 dreamcastcard->clicks++;
 296                 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
 297                         dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
 298                 mod_timer(&dreamcastcard->timer, jiffies + 1);
 299         }
 300 }
 301
 302 static void aica_period_elapsed(struct timer_list *t)
 303 {
 304         struct snd_card_aica *dreamcastcard = from_timer(dreamcastcard,
 305                                                               t, timer);
 306         struct snd_pcm_substream *substream = dreamcastcard->substream;
 307         /*timer function - so cannot sleep */
 308         int play_period;
 309         struct snd_pcm_runtime *runtime;
 310         runtime = substream->runtime;
 311         dreamcastcard = substream->pcm->private_data;
 312         /* Have we played out an additional period? */
 313         play_period =
 314             frames_to_bytes(runtime,
 315                             readl
 316                             (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
 317             AICA_PERIOD_SIZE;
 318         if (play_period == dreamcastcard->current_period) {
 319                 /* reschedule the timer */
 320                 mod_timer(&(dreamcastcard->timer), jiffies + 1);
 321                 return;
 322         }
 323         if (runtime->channels > 1)
 324                 dreamcastcard->current_period = play_period;
 325         if (unlikely(dreamcastcard->dma_check == 0))
 326                 dreamcastcard->dma_check = 1;
 327         schedule_work(&(dreamcastcard->spu_dma_work));
 328 }
 329
 330 static void spu_begin_dma(struct snd_pcm_substream *substream)
 331 {
 332         struct snd_card_aica *dreamcastcard;
 333         struct snd_pcm_runtime *runtime;
 334         runtime = substream->runtime;
 335         dreamcastcard = substream->pcm->private_data;
 336         /*get the queue to do the work */
 337         schedule_work(&(dreamcastcard->spu_dma_work));
 338         mod_timer(&dreamcastcard->timer, jiffies + 4);
 339 }
 340
 341 static int snd_aicapcm_pcm_open(struct snd_pcm_substream
 342                                 *substream)
 343 {
 344         struct snd_pcm_runtime *runtime;
 345         struct aica_channel *channel;
 346         struct snd_card_aica *dreamcastcard;
 347         if (!enable)
 348                 return -ENOENT;
 349         dreamcastcard = substream->pcm->private_data;
 350         channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
 351         if (!channel)
 352                 return -ENOMEM;
 353         /* set defaults for channel */
 354         channel->sfmt = SM_8BIT;
 355         channel->cmd = AICA_CMD_START;
 356         channel->vol = dreamcastcard->master_volume;
 357         channel->pan = 0x80;
 358         channel->pos = 0;
 359         channel->flags = 0;     /* default to mono */
 360         dreamcastcard->channel = channel;
 361         runtime = substream->runtime;
 362         runtime->hw = snd_pcm_aica_playback_hw;
 363         spu_enable();
 364         dreamcastcard->clicks = 0;
 365         dreamcastcard->current_period = 0;
 366         dreamcastcard->dma_check = 0;
 367         return 0;
 368 }
 369
 370 static int snd_aicapcm_pcm_close(struct snd_pcm_substream
 371                                  *substream)
 372 {
 373         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
 374         flush_work(&(dreamcastcard->spu_dma_work));
 375         del_timer(&dreamcastcard->timer);
 376         dreamcastcard->substream = NULL;
 377         kfree(dreamcastcard->channel);
 378         spu_disable();
 379         return 0;
 380 }
 381
 382 static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
 383                                    *substream)
 384 {
 385         /* Free the DMA buffer */
 386         return snd_pcm_lib_free_pages(substream);
 387 }
 388
 389 static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
 390                                      *substream, struct snd_pcm_hw_params
 391                                      *hw_params)
 392 {
 393         /* Allocate a DMA buffer using ALSA built-ins */
 394         return
 395             snd_pcm_lib_malloc_pages(substream,
 396                                      params_buffer_bytes(hw_params));
 397 }
 398
 399 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
 400                                    *substream)
 401 {
 402         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
 403         if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
 404                 dreamcastcard->channel->sfmt = SM_16BIT;
 405         dreamcastcard->channel->freq = substream->runtime->rate;
 406         dreamcastcard->substream = substream;
 407         return 0;
 408 }
 409
 410 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
 411                                    *substream, int cmd)
 412 {
 413         switch (cmd) {
 414         case SNDRV_PCM_TRIGGER_START:
 415                 spu_begin_dma(substream);
 416                 break;
 417         case SNDRV_PCM_TRIGGER_STOP:
 418                 aica_chn_halt();
 419                 break;
 420         default:
 421                 return -EINVAL;
 422         }
 423         return 0;
 424 }
 425
 426 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
 427                                              *substream)
 428 {
 429         return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
 430 }
 431
 432 static const struct snd_pcm_ops snd_aicapcm_playback_ops = {
 433         .open = snd_aicapcm_pcm_open,
 434         .close = snd_aicapcm_pcm_close,
 435         .ioctl = snd_pcm_lib_ioctl,
 436         .hw_params = snd_aicapcm_pcm_hw_params,
 437         .hw_free = snd_aicapcm_pcm_hw_free,
 438         .prepare = snd_aicapcm_pcm_prepare,
 439         .trigger = snd_aicapcm_pcm_trigger,
 440         .pointer = snd_aicapcm_pcm_pointer,
 441 };
 442
 443 /* TO DO: set up to handle more than one pcm instance */
 444 static int __init snd_aicapcmchip(struct snd_card_aica
 445                                   *dreamcastcard, int pcm_index)
 446 {
 447         struct snd_pcm *pcm;
 448         int err;
 449         /* AICA has no capture ability */
 450         err =
 451             snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
 452                         &pcm);
 453         if (unlikely(err < 0))
 454                 return err;
 455         pcm->private_data = dreamcastcard;
 456         strcpy(pcm->name, "AICA PCM");
 457         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 458                         &snd_aicapcm_playback_ops);
 459         /* Allocate the DMA buffers */
 460         err =
 461             snd_pcm_lib_preallocate_pages_for_all(pcm,
 462                                                   SNDRV_DMA_TYPE_CONTINUOUS,
 463                                                   snd_dma_continuous_data
 464                                                   (GFP_KERNEL),
 465                                                   AICA_BUFFER_SIZE,
 466                                                   AICA_BUFFER_SIZE);
 467         return err;
 468 }
 469
 470 /* Mixer controls */
 471 #define aica_pcmswitch_info             snd_ctl_boolean_mono_info
 472
 473 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
 474                               struct snd_ctl_elem_value *ucontrol)
 475 {
 476         ucontrol->value.integer.value[0] = 1;   /* TO DO: Fix me */
 477         return 0;
 478 }
 479
 480 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
 481                               struct snd_ctl_elem_value *ucontrol)
 482 {
 483         if (ucontrol->value.integer.value[0] == 1)
 484                 return 0;       /* TO DO: Fix me */
 485         else
 486                 aica_chn_halt();
 487         return 0;
 488 }
 489
 490 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
 491                                struct snd_ctl_elem_info *uinfo)
 492 {
 493         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 494         uinfo->count = 1;
 495         uinfo->value.integer.min = 0;
 496         uinfo->value.integer.max = 0xFF;
 497         return 0;
 498 }
 499
 500 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
 501                               struct snd_ctl_elem_value *ucontrol)
 502 {
 503         struct snd_card_aica *dreamcastcard;
 504         dreamcastcard = kcontrol->private_data;
 505         if (unlikely(!dreamcastcard->channel))
 506                 return -ETXTBSY;        /* we've not yet been set up */
 507         ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
 508         return 0;
 509 }
 510
 511 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
 512                               struct snd_ctl_elem_value *ucontrol)
 513 {
 514         struct snd_card_aica *dreamcastcard;
 515         unsigned int vol;
 516         dreamcastcard = kcontrol->private_data;
 517         if (unlikely(!dreamcastcard->channel))
 518                 return -ETXTBSY;
 519         vol = ucontrol->value.integer.value[0];
 520         if (vol > 0xff)
 521                 return -EINVAL;
 522         if (unlikely(dreamcastcard->channel->vol == vol))
 523                 return 0;
 524         dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
 525         dreamcastcard->master_volume = ucontrol->value.integer.value[0];
 526         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
 527                     dreamcastcard->channel, sizeof(struct aica_channel));
 528         return 1;
 529 }
 530
 531 static const struct snd_kcontrol_new snd_aica_pcmswitch_control = {
 532         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 533         .name = "PCM Playback Switch",
 534         .index = 0,
 535         .info = aica_pcmswitch_info,
 536         .get = aica_pcmswitch_get,
 537         .put = aica_pcmswitch_put
 538 };
 539
 540 static const struct snd_kcontrol_new snd_aica_pcmvolume_control = {
 541         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
 542         .name = "PCM Playback Volume",
 543         .index = 0,
 544         .info = aica_pcmvolume_info,
 545         .get = aica_pcmvolume_get,
 546         .put = aica_pcmvolume_put
 547 };
 548
 549 static int load_aica_firmware(void)
 550 {
 551         int err;
 552         const struct firmware *fw_entry;
 553         spu_reset();
 554         err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
 555         if (unlikely(err))
 556                 return err;
 557         /* write firmware into memory */
 558         spu_disable();
 559         spu_memload(0, fw_entry->data, fw_entry->size);
 560         spu_enable();
 561         release_firmware(fw_entry);
 562         return err;
 563 }
 564
 565 static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard)
 566 {
 567         int err;
 568         err = snd_ctl_add
 569             (dreamcastcard->card,
 570              snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
 571         if (unlikely(err < 0))
 572                 return err;
 573         err = snd_ctl_add
 574             (dreamcastcard->card,
 575              snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
 576         if (unlikely(err < 0))
 577                 return err;
 578         return 0;
 579 }
 580
 581 static int snd_aica_remove(struct platform_device *devptr)
 582 {
 583         struct snd_card_aica *dreamcastcard;
 584         dreamcastcard = platform_get_drvdata(devptr);
 585         if (unlikely(!dreamcastcard))
 586                 return -ENODEV;
 587         snd_card_free(dreamcastcard->card);
 588         kfree(dreamcastcard);
 589         return 0;
 590 }
 591
 592 static int snd_aica_probe(struct platform_device *devptr)
 593 {
 594         int err;
 595         struct snd_card_aica *dreamcastcard;
 596         dreamcastcard = kzalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
 597         if (unlikely(!dreamcastcard))
 598                 return -ENOMEM;
 599         err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER,
 600                            THIS_MODULE, 0, &dreamcastcard->card);
 601         if (unlikely(err < 0)) {
 602                 kfree(dreamcastcard);
 603                 return err;
 604         }
 605         strcpy(dreamcastcard->card->driver, "snd_aica");
 606         strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
 607         strcpy(dreamcastcard->card->longname,
 608                "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
 609         /* Prepare to use the queue */
 610         INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
 611         timer_setup(&dreamcastcard->timer, aica_period_elapsed, 0);
 612         /* Load the PCM 'chip' */
 613         err = snd_aicapcmchip(dreamcastcard, 0);
 614         if (unlikely(err < 0))
 615                 goto freedreamcast;
 616         /* Add basic controls */
 617         err = add_aicamixer_controls(dreamcastcard);
 618         if (unlikely(err < 0))
 619                 goto freedreamcast;
 620         /* Register the card with ALSA subsystem */
 621         err = snd_card_register(dreamcastcard->card);
 622         if (unlikely(err < 0))
 623                 goto freedreamcast;
 624         platform_set_drvdata(devptr, dreamcastcard);
 625         snd_printk
 626             ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
 627         return 0;
 628       freedreamcast:
 629         snd_card_free(dreamcastcard->card);
 630         kfree(dreamcastcard);
 631         return err;
 632 }
 633
 634 static struct platform_driver snd_aica_driver = {
 635         .probe = snd_aica_probe,
 636         .remove = snd_aica_remove,
 637         .driver = {
 638                 .name = SND_AICA_DRIVER,
 639         },
 640 };
 641
 642 static int __init aica_init(void)
 643 {
 644         int err;
 645         err = platform_driver_register(&snd_aica_driver);
 646         if (unlikely(err < 0))
 647                 return err;
 648         pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
 649                                              aica_memory_space, 2);
 650         if (IS_ERR(pd)) {
 651                 platform_driver_unregister(&snd_aica_driver);
 652                 return PTR_ERR(pd);
 653         }
 654         /* Load the firmware */
 655         return load_aica_firmware();
 656 }
 657
 658 static void __exit aica_exit(void)
 659 {
 660         platform_device_unregister(pd);
 661         platform_driver_unregister(&snd_aica_driver);
 662         /* Kill any sound still playing and reset ARM7 to safe state */
 663         spu_reset();
 664 }
 665
 666 module_init(aica_init);
 667 module_exit(aica_exit);