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); 658