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 <sound/core.h> 39 #include <sound/control.h> 40 #include <sound/pcm.h> 41 #include <sound/initval.h> 42 #include <sound/info.h> 43 #include <asm/io.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 /* 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 unsigned long flags; 110 if (snd_BUG_ON(length % 4)) 111 return; 112 for (i = 0; i < length; i++) { 113 if (!(i % 8)) 114 spu_write_wait(); 115 local_irq_save(flags); 116 writel(what, toi + SPU_MEMORY_BASE); 117 local_irq_restore(flags); 118 toi++; 119 } 120 } 121 122 /* spu_memload - write to SPU address space */ 123 static void spu_memload(u32 toi, void *from, int length) 124 { 125 unsigned long flags; 126 u32 *froml = from; 127 u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi); 128 int i; 129 u32 val; 130 length = DIV_ROUND_UP(length, 4); 131 spu_write_wait(); 132 for (i = 0; i < length; i++) { 133 if (!(i % 8)) 134 spu_write_wait(); 135 val = *froml; 136 local_irq_save(flags); 137 writel(val, to); 138 local_irq_restore(flags); 139 froml++; 140 to++; 141 } 142 } 143 144 /* spu_disable - set spu registers to stop sound output */ 145 static void spu_disable(void) 146 { 147 int i; 148 unsigned long flags; 149 u32 regval; 150 spu_write_wait(); 151 regval = readl(ARM_RESET_REGISTER); 152 regval |= 1; 153 spu_write_wait(); 154 local_irq_save(flags); 155 writel(regval, ARM_RESET_REGISTER); 156 local_irq_restore(flags); 157 for (i = 0; i < 64; i++) { 158 spu_write_wait(); 159 regval = readl(SPU_REGISTER_BASE + (i * 0x80)); 160 regval = (regval & ~0x4000) | 0x8000; 161 spu_write_wait(); 162 local_irq_save(flags); 163 writel(regval, SPU_REGISTER_BASE + (i * 0x80)); 164 local_irq_restore(flags); 165 } 166 } 167 168 /* spu_enable - set spu registers to enable sound output */ 169 static void spu_enable(void) 170 { 171 unsigned long flags; 172 u32 regval = readl(ARM_RESET_REGISTER); 173 regval &= ~1; 174 spu_write_wait(); 175 local_irq_save(flags); 176 writel(regval, ARM_RESET_REGISTER); 177 local_irq_restore(flags); 178 } 179 180 /* 181 * Halt the sound processor, clear the memory, 182 * load some default ARM7 code, and then restart ARM7 183 */ 184 static void spu_reset(void) 185 { 186 unsigned long flags; 187 spu_disable(); 188 spu_memset(0, 0, 0x200000 / 4); 189 /* Put ARM7 in endless loop */ 190 local_irq_save(flags); 191 __raw_writel(0xea000002, SPU_MEMORY_BASE); 192 local_irq_restore(flags); 193 spu_enable(); 194 } 195 196 /* aica_chn_start - write to spu to start playback */ 197 static void aica_chn_start(void) 198 { 199 unsigned long flags; 200 spu_write_wait(); 201 local_irq_save(flags); 202 writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT); 203 local_irq_restore(flags); 204 } 205 206 /* aica_chn_halt - write to spu to halt playback */ 207 static void aica_chn_halt(void) 208 { 209 unsigned long flags; 210 spu_write_wait(); 211 local_irq_save(flags); 212 writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT); 213 local_irq_restore(flags); 214 } 215 216 /* ALSA code below */ 217 static struct snd_pcm_hardware snd_pcm_aica_playback_hw = { 218 .info = (SNDRV_PCM_INFO_NONINTERLEAVED), 219 .formats = 220 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | 221 SNDRV_PCM_FMTBIT_IMA_ADPCM), 222 .rates = SNDRV_PCM_RATE_8000_48000, 223 .rate_min = 8000, 224 .rate_max = 48000, 225 .channels_min = 1, 226 .channels_max = 2, 227 .buffer_bytes_max = AICA_BUFFER_SIZE, 228 .period_bytes_min = AICA_PERIOD_SIZE, 229 .period_bytes_max = AICA_PERIOD_SIZE, 230 .periods_min = AICA_PERIOD_NUMBER, 231 .periods_max = AICA_PERIOD_NUMBER, 232 }; 233 234 static int aica_dma_transfer(int channels, int buffer_size, 235 struct snd_pcm_substream *substream) 236 { 237 int q, err, period_offset; 238 struct snd_card_aica *dreamcastcard; 239 struct snd_pcm_runtime *runtime; 240 unsigned long flags; 241 err = 0; 242 dreamcastcard = substream->pcm->private_data; 243 period_offset = dreamcastcard->clicks; 244 period_offset %= (AICA_PERIOD_NUMBER / channels); 245 runtime = substream->runtime; 246 for (q = 0; q < channels; q++) { 247 local_irq_save(flags); 248 err = dma_xfer(AICA_DMA_CHANNEL, 249 (unsigned long) (runtime->dma_area + 250 (AICA_BUFFER_SIZE * q) / 251 channels + 252 AICA_PERIOD_SIZE * 253 period_offset), 254 AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET + 255 AICA_PERIOD_SIZE * period_offset, 256 buffer_size / channels, AICA_DMA_MODE); 257 if (unlikely(err < 0)) { 258 local_irq_restore(flags); 259 break; 260 } 261 dma_wait_for_completion(AICA_DMA_CHANNEL); 262 local_irq_restore(flags); 263 } 264 return err; 265 } 266 267 static void startup_aica(struct snd_card_aica *dreamcastcard) 268 { 269 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, 270 dreamcastcard->channel, sizeof(struct aica_channel)); 271 aica_chn_start(); 272 } 273 274 static void run_spu_dma(struct work_struct *work) 275 { 276 int buffer_size; 277 struct snd_pcm_runtime *runtime; 278 struct snd_card_aica *dreamcastcard; 279 dreamcastcard = 280 container_of(work, struct snd_card_aica, spu_dma_work); 281 runtime = dreamcastcard->substream->runtime; 282 if (unlikely(dreamcastcard->dma_check == 0)) { 283 buffer_size = 284 frames_to_bytes(runtime, runtime->buffer_size); 285 if (runtime->channels > 1) 286 dreamcastcard->channel->flags |= 0x01; 287 aica_dma_transfer(runtime->channels, buffer_size, 288 dreamcastcard->substream); 289 startup_aica(dreamcastcard); 290 dreamcastcard->clicks = 291 buffer_size / (AICA_PERIOD_SIZE * runtime->channels); 292 return; 293 } else { 294 aica_dma_transfer(runtime->channels, 295 AICA_PERIOD_SIZE * runtime->channels, 296 dreamcastcard->substream); 297 snd_pcm_period_elapsed(dreamcastcard->substream); 298 dreamcastcard->clicks++; 299 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER)) 300 dreamcastcard->clicks %= AICA_PERIOD_NUMBER; 301 mod_timer(&dreamcastcard->timer, jiffies + 1); 302 } 303 } 304 305 static void aica_period_elapsed(unsigned long timer_var) 306 { 307 /*timer function - so cannot sleep */ 308 int play_period; 309 struct snd_pcm_runtime *runtime; 310 struct snd_pcm_substream *substream; 311 struct snd_card_aica *dreamcastcard; 312 substream = (struct snd_pcm_substream *) timer_var; 313 runtime = substream->runtime; 314 dreamcastcard = substream->pcm->private_data; 315 /* Have we played out an additional period? */ 316 play_period = 317 frames_to_bytes(runtime, 318 readl 319 (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) / 320 AICA_PERIOD_SIZE; 321 if (play_period == dreamcastcard->current_period) { 322 /* reschedule the timer */ 323 mod_timer(&(dreamcastcard->timer), jiffies + 1); 324 return; 325 } 326 if (runtime->channels > 1) 327 dreamcastcard->current_period = play_period; 328 if (unlikely(dreamcastcard->dma_check == 0)) 329 dreamcastcard->dma_check = 1; 330 queue_work(aica_queue, &(dreamcastcard->spu_dma_work)); 331 } 332 333 static void spu_begin_dma(struct snd_pcm_substream *substream) 334 { 335 struct snd_card_aica *dreamcastcard; 336 struct snd_pcm_runtime *runtime; 337 runtime = substream->runtime; 338 dreamcastcard = substream->pcm->private_data; 339 /*get the queue to do the work */ 340 queue_work(aica_queue, &(dreamcastcard->spu_dma_work)); 341 /* Timer may already be running */ 342 if (unlikely(dreamcastcard->timer.data)) { 343 mod_timer(&dreamcastcard->timer, jiffies + 4); 344 return; 345 } 346 init_timer(&(dreamcastcard->timer)); 347 dreamcastcard->timer.data = (unsigned long) substream; 348 dreamcastcard->timer.function = aica_period_elapsed; 349 dreamcastcard->timer.expires = jiffies + 4; 350 add_timer(&(dreamcastcard->timer)); 351 } 352 353 static int snd_aicapcm_pcm_open(struct snd_pcm_substream 354 *substream) 355 { 356 struct snd_pcm_runtime *runtime; 357 struct aica_channel *channel; 358 struct snd_card_aica *dreamcastcard; 359 if (!enable) 360 return -ENOENT; 361 dreamcastcard = substream->pcm->private_data; 362 channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL); 363 if (!channel) 364 return -ENOMEM; 365 /* set defaults for channel */ 366 channel->sfmt = SM_8BIT; 367 channel->cmd = AICA_CMD_START; 368 channel->vol = dreamcastcard->master_volume; 369 channel->pan = 0x80; 370 channel->pos = 0; 371 channel->flags = 0; /* default to mono */ 372 dreamcastcard->channel = channel; 373 runtime = substream->runtime; 374 runtime->hw = snd_pcm_aica_playback_hw; 375 spu_enable(); 376 dreamcastcard->clicks = 0; 377 dreamcastcard->current_period = 0; 378 dreamcastcard->dma_check = 0; 379 return 0; 380 } 381 382 static int snd_aicapcm_pcm_close(struct snd_pcm_substream 383 *substream) 384 { 385 struct snd_card_aica *dreamcastcard = substream->pcm->private_data; 386 flush_workqueue(aica_queue); 387 if (dreamcastcard->timer.data) 388 del_timer(&dreamcastcard->timer); 389 kfree(dreamcastcard->channel); 390 spu_disable(); 391 return 0; 392 } 393 394 static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream 395 *substream) 396 { 397 /* Free the DMA buffer */ 398 return snd_pcm_lib_free_pages(substream); 399 } 400 401 static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream 402 *substream, struct snd_pcm_hw_params 403 *hw_params) 404 { 405 /* Allocate a DMA buffer using ALSA built-ins */ 406 return 407 snd_pcm_lib_malloc_pages(substream, 408 params_buffer_bytes(hw_params)); 409 } 410 411 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream 412 *substream) 413 { 414 struct snd_card_aica *dreamcastcard = substream->pcm->private_data; 415 if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE) 416 dreamcastcard->channel->sfmt = SM_16BIT; 417 dreamcastcard->channel->freq = substream->runtime->rate; 418 dreamcastcard->substream = substream; 419 return 0; 420 } 421 422 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream 423 *substream, int cmd) 424 { 425 switch (cmd) { 426 case SNDRV_PCM_TRIGGER_START: 427 spu_begin_dma(substream); 428 break; 429 case SNDRV_PCM_TRIGGER_STOP: 430 aica_chn_halt(); 431 break; 432 default: 433 return -EINVAL; 434 } 435 return 0; 436 } 437 438 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream 439 *substream) 440 { 441 return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER); 442 } 443 444 static struct snd_pcm_ops snd_aicapcm_playback_ops = { 445 .open = snd_aicapcm_pcm_open, 446 .close = snd_aicapcm_pcm_close, 447 .ioctl = snd_pcm_lib_ioctl, 448 .hw_params = snd_aicapcm_pcm_hw_params, 449 .hw_free = snd_aicapcm_pcm_hw_free, 450 .prepare = snd_aicapcm_pcm_prepare, 451 .trigger = snd_aicapcm_pcm_trigger, 452 .pointer = snd_aicapcm_pcm_pointer, 453 }; 454 455 /* TO DO: set up to handle more than one pcm instance */ 456 static int __init snd_aicapcmchip(struct snd_card_aica 457 *dreamcastcard, int pcm_index) 458 { 459 struct snd_pcm *pcm; 460 int err; 461 /* AICA has no capture ability */ 462 err = 463 snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, 464 &pcm); 465 if (unlikely(err < 0)) 466 return err; 467 pcm->private_data = dreamcastcard; 468 strcpy(pcm->name, "AICA PCM"); 469 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 470 &snd_aicapcm_playback_ops); 471 /* Allocate the DMA buffers */ 472 err = 473 snd_pcm_lib_preallocate_pages_for_all(pcm, 474 SNDRV_DMA_TYPE_CONTINUOUS, 475 snd_dma_continuous_data 476 (GFP_KERNEL), 477 AICA_BUFFER_SIZE, 478 AICA_BUFFER_SIZE); 479 return err; 480 } 481 482 /* Mixer controls */ 483 #define aica_pcmswitch_info snd_ctl_boolean_mono_info 484 485 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol, 486 struct snd_ctl_elem_value *ucontrol) 487 { 488 ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */ 489 return 0; 490 } 491 492 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol, 493 struct snd_ctl_elem_value *ucontrol) 494 { 495 if (ucontrol->value.integer.value[0] == 1) 496 return 0; /* TO DO: Fix me */ 497 else 498 aica_chn_halt(); 499 return 0; 500 } 501 502 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol, 503 struct snd_ctl_elem_info *uinfo) 504 { 505 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 506 uinfo->count = 1; 507 uinfo->value.integer.min = 0; 508 uinfo->value.integer.max = 0xFF; 509 return 0; 510 } 511 512 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol, 513 struct snd_ctl_elem_value *ucontrol) 514 { 515 struct snd_card_aica *dreamcastcard; 516 dreamcastcard = kcontrol->private_data; 517 if (unlikely(!dreamcastcard->channel)) 518 return -ETXTBSY; /* we've not yet been set up */ 519 ucontrol->value.integer.value[0] = dreamcastcard->channel->vol; 520 return 0; 521 } 522 523 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol, 524 struct snd_ctl_elem_value *ucontrol) 525 { 526 struct snd_card_aica *dreamcastcard; 527 unsigned int vol; 528 dreamcastcard = kcontrol->private_data; 529 if (unlikely(!dreamcastcard->channel)) 530 return -ETXTBSY; 531 vol = ucontrol->value.integer.value[0]; 532 if (vol > 0xff) 533 return -EINVAL; 534 if (unlikely(dreamcastcard->channel->vol == vol)) 535 return 0; 536 dreamcastcard->channel->vol = ucontrol->value.integer.value[0]; 537 dreamcastcard->master_volume = ucontrol->value.integer.value[0]; 538 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, 539 dreamcastcard->channel, sizeof(struct aica_channel)); 540 return 1; 541 } 542 543 static struct snd_kcontrol_new snd_aica_pcmswitch_control = { 544 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 545 .name = "PCM Playback Switch", 546 .index = 0, 547 .info = aica_pcmswitch_info, 548 .get = aica_pcmswitch_get, 549 .put = aica_pcmswitch_put 550 }; 551 552 static struct snd_kcontrol_new snd_aica_pcmvolume_control = { 553 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 554 .name = "PCM Playback Volume", 555 .index = 0, 556 .info = aica_pcmvolume_info, 557 .get = aica_pcmvolume_get, 558 .put = aica_pcmvolume_put 559 }; 560 561 static int load_aica_firmware(void) 562 { 563 int err; 564 const struct firmware *fw_entry; 565 spu_reset(); 566 err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev); 567 if (unlikely(err)) 568 return err; 569 /* write firmware into memory */ 570 spu_disable(); 571 spu_memload(0, fw_entry->data, fw_entry->size); 572 spu_enable(); 573 release_firmware(fw_entry); 574 return err; 575 } 576 577 static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard) 578 { 579 int err; 580 err = snd_ctl_add 581 (dreamcastcard->card, 582 snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard)); 583 if (unlikely(err < 0)) 584 return err; 585 err = snd_ctl_add 586 (dreamcastcard->card, 587 snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard)); 588 if (unlikely(err < 0)) 589 return err; 590 return 0; 591 } 592 593 static int snd_aica_remove(struct platform_device *devptr) 594 { 595 struct snd_card_aica *dreamcastcard; 596 dreamcastcard = platform_get_drvdata(devptr); 597 if (unlikely(!dreamcastcard)) 598 return -ENODEV; 599 snd_card_free(dreamcastcard->card); 600 kfree(dreamcastcard); 601 return 0; 602 } 603 604 static int snd_aica_probe(struct platform_device *devptr) 605 { 606 int err; 607 struct snd_card_aica *dreamcastcard; 608 dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL); 609 if (unlikely(!dreamcastcard)) 610 return -ENOMEM; 611 err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER, 612 THIS_MODULE, 0, &dreamcastcard->card); 613 if (unlikely(err < 0)) { 614 kfree(dreamcastcard); 615 return err; 616 } 617 strcpy(dreamcastcard->card->driver, "snd_aica"); 618 strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER); 619 strcpy(dreamcastcard->card->longname, 620 "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast"); 621 /* Prepare to use the queue */ 622 INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma); 623 /* Load the PCM 'chip' */ 624 err = snd_aicapcmchip(dreamcastcard, 0); 625 if (unlikely(err < 0)) 626 goto freedreamcast; 627 dreamcastcard->timer.data = 0; 628 dreamcastcard->channel = NULL; 629 /* Add basic controls */ 630 err = add_aicamixer_controls(dreamcastcard); 631 if (unlikely(err < 0)) 632 goto freedreamcast; 633 /* Register the card with ALSA subsystem */ 634 err = snd_card_register(dreamcastcard->card); 635 if (unlikely(err < 0)) 636 goto freedreamcast; 637 platform_set_drvdata(devptr, dreamcastcard); 638 aica_queue = create_workqueue(CARD_NAME); 639 if (unlikely(!aica_queue)) 640 goto freedreamcast; 641 snd_printk 642 ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n"); 643 return 0; 644 freedreamcast: 645 snd_card_free(dreamcastcard->card); 646 kfree(dreamcastcard); 647 return err; 648 } 649 650 static struct platform_driver snd_aica_driver = { 651 .probe = snd_aica_probe, 652 .remove = snd_aica_remove, 653 .driver = { 654 .name = SND_AICA_DRIVER, 655 }, 656 }; 657 658 static int __init aica_init(void) 659 { 660 int err; 661 err = platform_driver_register(&snd_aica_driver); 662 if (unlikely(err < 0)) 663 return err; 664 pd = platform_device_register_simple(SND_AICA_DRIVER, -1, 665 aica_memory_space, 2); 666 if (IS_ERR(pd)) { 667 platform_driver_unregister(&snd_aica_driver); 668 return PTR_ERR(pd); 669 } 670 /* Load the firmware */ 671 return load_aica_firmware(); 672 } 673 674 static void __exit aica_exit(void) 675 { 676 /* Destroy the aica kernel thread * 677 * being extra cautious to check if it exists*/ 678 if (likely(aica_queue)) 679 destroy_workqueue(aica_queue); 680 platform_device_unregister(pd); 681 platform_driver_unregister(&snd_aica_driver); 682 /* Kill any sound still playing and reset ARM7 to safe state */ 683 spu_reset(); 684 } 685 686 module_init(aica_init); 687 module_exit(aica_exit); 688