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/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 53 /* module parameters */ 54 #define CARD_NAME "AICA" 55 static int index = -1; 56 static char *id; 57 static int enable = 1; 58 module_param(index, int, 0444); 59 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard."); 60 module_param(id, charp, 0444); 61 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard."); 62 module_param(enable, bool, 0644); 63 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard."); 64 65 /* Use workqueue */ 66 static struct workqueue_struct *aica_queue; 67 68 /* Simple platform device */ 69 static struct platform_device *pd; 70 static struct resource aica_memory_space[2] = { 71 { 72 .name = "AICA ARM CONTROL", 73 .start = ARM_RESET_REGISTER, 74 .flags = IORESOURCE_MEM, 75 .end = ARM_RESET_REGISTER + 3, 76 }, 77 { 78 .name = "AICA Sound RAM", 79 .start = SPU_MEMORY_BASE, 80 .flags = IORESOURCE_MEM, 81 .end = SPU_MEMORY_BASE + 0x200000 - 1, 82 }, 83 }; 84 85 /* SPU specific functions */ 86 /* spu_write_wait - wait for G2-SH FIFO to clear */ 87 static void spu_write_wait(void) 88 { 89 int time_count; 90 time_count = 0; 91 while (1) { 92 if (!(readl(G2_FIFO) & 0x11)) 93 break; 94 /* To ensure hardware failure doesn't wedge kernel */ 95 time_count++; 96 if (time_count > 0x10000) { 97 snd_printk 98 ("WARNING: G2 FIFO appears to be blocked.\n"); 99 break; 100 } 101 } 102 } 103 104 /* spu_memset - write to memory in SPU address space */ 105 static void spu_memset(u32 toi, u32 what, int length) 106 { 107 int i; 108 unsigned long flags; 109 if (snd_BUG_ON(length % 4)) 110 return; 111 for (i = 0; i < length; i++) { 112 if (!(i % 8)) 113 spu_write_wait(); 114 local_irq_save(flags); 115 writel(what, toi + SPU_MEMORY_BASE); 116 local_irq_restore(flags); 117 toi++; 118 } 119 } 120 121 /* spu_memload - write to SPU address space */ 122 static void spu_memload(u32 toi, void *from, int length) 123 { 124 unsigned long flags; 125 u32 *froml = from; 126 u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi); 127 int i; 128 u32 val; 129 length = DIV_ROUND_UP(length, 4); 130 spu_write_wait(); 131 for (i = 0; i < length; i++) { 132 if (!(i % 8)) 133 spu_write_wait(); 134 val = *froml; 135 local_irq_save(flags); 136 writel(val, to); 137 local_irq_restore(flags); 138 froml++; 139 to++; 140 } 141 } 142 143 /* spu_disable - set spu registers to stop sound output */ 144 static void spu_disable(void) 145 { 146 int i; 147 unsigned long flags; 148 u32 regval; 149 spu_write_wait(); 150 regval = readl(ARM_RESET_REGISTER); 151 regval |= 1; 152 spu_write_wait(); 153 local_irq_save(flags); 154 writel(regval, ARM_RESET_REGISTER); 155 local_irq_restore(flags); 156 for (i = 0; i < 64; i++) { 157 spu_write_wait(); 158 regval = readl(SPU_REGISTER_BASE + (i * 0x80)); 159 regval = (regval & ~0x4000) | 0x8000; 160 spu_write_wait(); 161 local_irq_save(flags); 162 writel(regval, SPU_REGISTER_BASE + (i * 0x80)); 163 local_irq_restore(flags); 164 } 165 } 166 167 /* spu_enable - set spu registers to enable sound output */ 168 static void spu_enable(void) 169 { 170 unsigned long flags; 171 u32 regval = readl(ARM_RESET_REGISTER); 172 regval &= ~1; 173 spu_write_wait(); 174 local_irq_save(flags); 175 writel(regval, ARM_RESET_REGISTER); 176 local_irq_restore(flags); 177 } 178 179 /* 180 * Halt the sound processor, clear the memory, 181 * load some default ARM7 code, and then restart ARM7 182 */ 183 static void spu_reset(void) 184 { 185 unsigned long flags; 186 spu_disable(); 187 spu_memset(0, 0, 0x200000 / 4); 188 /* Put ARM7 in endless loop */ 189 local_irq_save(flags); 190 ctrl_outl(0xea000002, SPU_MEMORY_BASE); 191 local_irq_restore(flags); 192 spu_enable(); 193 } 194 195 /* aica_chn_start - write to spu to start playback */ 196 static void aica_chn_start(void) 197 { 198 unsigned long flags; 199 spu_write_wait(); 200 local_irq_save(flags); 201 writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT); 202 local_irq_restore(flags); 203 } 204 205 /* aica_chn_halt - write to spu to halt playback */ 206 static void aica_chn_halt(void) 207 { 208 unsigned long flags; 209 spu_write_wait(); 210 local_irq_save(flags); 211 writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT); 212 local_irq_restore(flags); 213 } 214 215 /* ALSA code below */ 216 static struct snd_pcm_hardware snd_pcm_aica_playback_hw = { 217 .info = (SNDRV_PCM_INFO_NONINTERLEAVED), 218 .formats = 219 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | 220 SNDRV_PCM_FMTBIT_IMA_ADPCM), 221 .rates = SNDRV_PCM_RATE_8000_48000, 222 .rate_min = 8000, 223 .rate_max = 48000, 224 .channels_min = 1, 225 .channels_max = 2, 226 .buffer_bytes_max = AICA_BUFFER_SIZE, 227 .period_bytes_min = AICA_PERIOD_SIZE, 228 .period_bytes_max = AICA_PERIOD_SIZE, 229 .periods_min = AICA_PERIOD_NUMBER, 230 .periods_max = AICA_PERIOD_NUMBER, 231 }; 232 233 static int aica_dma_transfer(int channels, int buffer_size, 234 struct snd_pcm_substream *substream) 235 { 236 int q, err, period_offset; 237 struct snd_card_aica *dreamcastcard; 238 struct snd_pcm_runtime *runtime; 239 unsigned long flags; 240 err = 0; 241 dreamcastcard = substream->pcm->private_data; 242 period_offset = dreamcastcard->clicks; 243 period_offset %= (AICA_PERIOD_NUMBER / channels); 244 runtime = substream->runtime; 245 for (q = 0; q < channels; q++) { 246 local_irq_save(flags); 247 err = dma_xfer(AICA_DMA_CHANNEL, 248 (unsigned long) (runtime->dma_area + 249 (AICA_BUFFER_SIZE * q) / 250 channels + 251 AICA_PERIOD_SIZE * 252 period_offset), 253 AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET + 254 AICA_PERIOD_SIZE * period_offset, 255 buffer_size / channels, AICA_DMA_MODE); 256 if (unlikely(err < 0)) { 257 local_irq_restore(flags); 258 break; 259 } 260 dma_wait_for_completion(AICA_DMA_CHANNEL); 261 local_irq_restore(flags); 262 } 263 return err; 264 } 265 266 static void startup_aica(struct snd_card_aica *dreamcastcard) 267 { 268 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, 269 dreamcastcard->channel, sizeof(struct aica_channel)); 270 aica_chn_start(); 271 } 272 273 static void run_spu_dma(struct work_struct *work) 274 { 275 int buffer_size; 276 struct snd_pcm_runtime *runtime; 277 struct snd_card_aica *dreamcastcard; 278 dreamcastcard = 279 container_of(work, struct snd_card_aica, spu_dma_work); 280 runtime = dreamcastcard->substream->runtime; 281 if (unlikely(dreamcastcard->dma_check == 0)) { 282 buffer_size = 283 frames_to_bytes(runtime, runtime->buffer_size); 284 if (runtime->channels > 1) 285 dreamcastcard->channel->flags |= 0x01; 286 aica_dma_transfer(runtime->channels, buffer_size, 287 dreamcastcard->substream); 288 startup_aica(dreamcastcard); 289 dreamcastcard->clicks = 290 buffer_size / (AICA_PERIOD_SIZE * runtime->channels); 291 return; 292 } else { 293 aica_dma_transfer(runtime->channels, 294 AICA_PERIOD_SIZE * runtime->channels, 295 dreamcastcard->substream); 296 snd_pcm_period_elapsed(dreamcastcard->substream); 297 dreamcastcard->clicks++; 298 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER)) 299 dreamcastcard->clicks %= AICA_PERIOD_NUMBER; 300 mod_timer(&dreamcastcard->timer, jiffies + 1); 301 } 302 } 303 304 static void aica_period_elapsed(unsigned long timer_var) 305 { 306 /*timer function - so cannot sleep */ 307 int play_period; 308 struct snd_pcm_runtime *runtime; 309 struct snd_pcm_substream *substream; 310 struct snd_card_aica *dreamcastcard; 311 substream = (struct snd_pcm_substream *) timer_var; 312 runtime = substream->runtime; 313 dreamcastcard = substream->pcm->private_data; 314 /* Have we played out an additional period? */ 315 play_period = 316 frames_to_bytes(runtime, 317 readl 318 (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) / 319 AICA_PERIOD_SIZE; 320 if (play_period == dreamcastcard->current_period) { 321 /* reschedule the timer */ 322 mod_timer(&(dreamcastcard->timer), jiffies + 1); 323 return; 324 } 325 if (runtime->channels > 1) 326 dreamcastcard->current_period = play_period; 327 if (unlikely(dreamcastcard->dma_check == 0)) 328 dreamcastcard->dma_check = 1; 329 queue_work(aica_queue, &(dreamcastcard->spu_dma_work)); 330 } 331 332 static void spu_begin_dma(struct snd_pcm_substream *substream) 333 { 334 struct snd_card_aica *dreamcastcard; 335 struct snd_pcm_runtime *runtime; 336 runtime = substream->runtime; 337 dreamcastcard = substream->pcm->private_data; 338 /*get the queue to do the work */ 339 queue_work(aica_queue, &(dreamcastcard->spu_dma_work)); 340 /* Timer may already be running */ 341 if (unlikely(dreamcastcard->timer.data)) { 342 mod_timer(&dreamcastcard->timer, jiffies + 4); 343 return; 344 } 345 init_timer(&(dreamcastcard->timer)); 346 dreamcastcard->timer.data = (unsigned long) substream; 347 dreamcastcard->timer.function = aica_period_elapsed; 348 dreamcastcard->timer.expires = jiffies + 4; 349 add_timer(&(dreamcastcard->timer)); 350 } 351 352 static int snd_aicapcm_pcm_open(struct snd_pcm_substream 353 *substream) 354 { 355 struct snd_pcm_runtime *runtime; 356 struct aica_channel *channel; 357 struct snd_card_aica *dreamcastcard; 358 if (!enable) 359 return -ENOENT; 360 dreamcastcard = substream->pcm->private_data; 361 channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL); 362 if (!channel) 363 return -ENOMEM; 364 /* set defaults for channel */ 365 channel->sfmt = SM_8BIT; 366 channel->cmd = AICA_CMD_START; 367 channel->vol = dreamcastcard->master_volume; 368 channel->pan = 0x80; 369 channel->pos = 0; 370 channel->flags = 0; /* default to mono */ 371 dreamcastcard->channel = channel; 372 runtime = substream->runtime; 373 runtime->hw = snd_pcm_aica_playback_hw; 374 spu_enable(); 375 dreamcastcard->clicks = 0; 376 dreamcastcard->current_period = 0; 377 dreamcastcard->dma_check = 0; 378 return 0; 379 } 380 381 static int snd_aicapcm_pcm_close(struct snd_pcm_substream 382 *substream) 383 { 384 struct snd_card_aica *dreamcastcard = substream->pcm->private_data; 385 flush_workqueue(aica_queue); 386 if (dreamcastcard->timer.data) 387 del_timer(&dreamcastcard->timer); 388 kfree(dreamcastcard->channel); 389 spu_disable(); 390 return 0; 391 } 392 393 static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream 394 *substream) 395 { 396 /* Free the DMA buffer */ 397 return snd_pcm_lib_free_pages(substream); 398 } 399 400 static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream 401 *substream, struct snd_pcm_hw_params 402 *hw_params) 403 { 404 /* Allocate a DMA buffer using ALSA built-ins */ 405 return 406 snd_pcm_lib_malloc_pages(substream, 407 params_buffer_bytes(hw_params)); 408 } 409 410 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream 411 *substream) 412 { 413 struct snd_card_aica *dreamcastcard = substream->pcm->private_data; 414 if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE) 415 dreamcastcard->channel->sfmt = SM_16BIT; 416 dreamcastcard->channel->freq = substream->runtime->rate; 417 dreamcastcard->substream = substream; 418 return 0; 419 } 420 421 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream 422 *substream, int cmd) 423 { 424 switch (cmd) { 425 case SNDRV_PCM_TRIGGER_START: 426 spu_begin_dma(substream); 427 break; 428 case SNDRV_PCM_TRIGGER_STOP: 429 aica_chn_halt(); 430 break; 431 default: 432 return -EINVAL; 433 } 434 return 0; 435 } 436 437 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream 438 *substream) 439 { 440 return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER); 441 } 442 443 static struct snd_pcm_ops snd_aicapcm_playback_ops = { 444 .open = snd_aicapcm_pcm_open, 445 .close = snd_aicapcm_pcm_close, 446 .ioctl = snd_pcm_lib_ioctl, 447 .hw_params = snd_aicapcm_pcm_hw_params, 448 .hw_free = snd_aicapcm_pcm_hw_free, 449 .prepare = snd_aicapcm_pcm_prepare, 450 .trigger = snd_aicapcm_pcm_trigger, 451 .pointer = snd_aicapcm_pcm_pointer, 452 }; 453 454 /* TO DO: set up to handle more than one pcm instance */ 455 static int __init snd_aicapcmchip(struct snd_card_aica 456 *dreamcastcard, int pcm_index) 457 { 458 struct snd_pcm *pcm; 459 int err; 460 /* AICA has no capture ability */ 461 err = 462 snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, 463 &pcm); 464 if (unlikely(err < 0)) 465 return err; 466 pcm->private_data = dreamcastcard; 467 strcpy(pcm->name, "AICA PCM"); 468 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 469 &snd_aicapcm_playback_ops); 470 /* Allocate the DMA buffers */ 471 err = 472 snd_pcm_lib_preallocate_pages_for_all(pcm, 473 SNDRV_DMA_TYPE_CONTINUOUS, 474 snd_dma_continuous_data 475 (GFP_KERNEL), 476 AICA_BUFFER_SIZE, 477 AICA_BUFFER_SIZE); 478 return err; 479 } 480 481 /* Mixer controls */ 482 #define aica_pcmswitch_info snd_ctl_boolean_mono_info 483 484 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol, 485 struct snd_ctl_elem_value *ucontrol) 486 { 487 ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */ 488 return 0; 489 } 490 491 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol, 492 struct snd_ctl_elem_value *ucontrol) 493 { 494 if (ucontrol->value.integer.value[0] == 1) 495 return 0; /* TO DO: Fix me */ 496 else 497 aica_chn_halt(); 498 return 0; 499 } 500 501 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol, 502 struct snd_ctl_elem_info *uinfo) 503 { 504 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 505 uinfo->count = 1; 506 uinfo->value.integer.min = 0; 507 uinfo->value.integer.max = 0xFF; 508 return 0; 509 } 510 511 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol, 512 struct snd_ctl_elem_value *ucontrol) 513 { 514 struct snd_card_aica *dreamcastcard; 515 dreamcastcard = kcontrol->private_data; 516 if (unlikely(!dreamcastcard->channel)) 517 return -ETXTBSY; /* we've not yet been set up */ 518 ucontrol->value.integer.value[0] = dreamcastcard->channel->vol; 519 return 0; 520 } 521 522 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol, 523 struct snd_ctl_elem_value *ucontrol) 524 { 525 struct snd_card_aica *dreamcastcard; 526 unsigned int vol; 527 dreamcastcard = kcontrol->private_data; 528 if (unlikely(!dreamcastcard->channel)) 529 return -ETXTBSY; 530 vol = ucontrol->value.integer.value[0]; 531 if (vol > 0xff) 532 return -EINVAL; 533 if (unlikely(dreamcastcard->channel->vol == vol)) 534 return 0; 535 dreamcastcard->channel->vol = ucontrol->value.integer.value[0]; 536 dreamcastcard->master_volume = ucontrol->value.integer.value[0]; 537 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, 538 dreamcastcard->channel, sizeof(struct aica_channel)); 539 return 1; 540 } 541 542 static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = { 543 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 544 .name = "PCM Playback Switch", 545 .index = 0, 546 .info = aica_pcmswitch_info, 547 .get = aica_pcmswitch_get, 548 .put = aica_pcmswitch_put 549 }; 550 551 static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = { 552 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 553 .name = "PCM Playback Volume", 554 .index = 0, 555 .info = aica_pcmvolume_info, 556 .get = aica_pcmvolume_get, 557 .put = aica_pcmvolume_put 558 }; 559 560 static int load_aica_firmware(void) 561 { 562 int err; 563 const struct firmware *fw_entry; 564 spu_reset(); 565 err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev); 566 if (unlikely(err)) 567 return err; 568 /* write firmware into memory */ 569 spu_disable(); 570 spu_memload(0, fw_entry->data, fw_entry->size); 571 spu_enable(); 572 release_firmware(fw_entry); 573 return err; 574 } 575 576 static int __devinit add_aicamixer_controls(struct snd_card_aica 577 *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 __devexit 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 platform_set_drvdata(devptr, NULL); 602 return 0; 603 } 604 605 static int __devinit snd_aica_probe(struct platform_device *devptr) 606 { 607 int err; 608 struct snd_card_aica *dreamcastcard; 609 dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL); 610 if (unlikely(!dreamcastcard)) 611 return -ENOMEM; 612 err = snd_card_create(index, SND_AICA_DRIVER, THIS_MODULE, 0, 613 &dreamcastcard->card); 614 if (unlikely(err < 0)) { 615 kfree(dreamcastcard); 616 return err; 617 } 618 strcpy(dreamcastcard->card->driver, "snd_aica"); 619 strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER); 620 strcpy(dreamcastcard->card->longname, 621 "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast"); 622 /* Prepare to use the queue */ 623 INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma); 624 /* Load the PCM 'chip' */ 625 err = snd_aicapcmchip(dreamcastcard, 0); 626 if (unlikely(err < 0)) 627 goto freedreamcast; 628 snd_card_set_dev(dreamcastcard->card, &devptr->dev); 629 dreamcastcard->timer.data = 0; 630 dreamcastcard->channel = NULL; 631 /* Add basic controls */ 632 err = add_aicamixer_controls(dreamcastcard); 633 if (unlikely(err < 0)) 634 goto freedreamcast; 635 /* Register the card with ALSA subsystem */ 636 err = snd_card_register(dreamcastcard->card); 637 if (unlikely(err < 0)) 638 goto freedreamcast; 639 platform_set_drvdata(devptr, dreamcastcard); 640 aica_queue = create_workqueue(CARD_NAME); 641 if (unlikely(!aica_queue)) 642 goto freedreamcast; 643 snd_printk 644 ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n"); 645 return 0; 646 freedreamcast: 647 snd_card_free(dreamcastcard->card); 648 kfree(dreamcastcard); 649 return err; 650 } 651 652 static struct platform_driver snd_aica_driver = { 653 .probe = snd_aica_probe, 654 .remove = __devexit_p(snd_aica_remove), 655 .driver = { 656 .name = SND_AICA_DRIVER}, 657 }; 658 659 static int __init aica_init(void) 660 { 661 int err; 662 err = platform_driver_register(&snd_aica_driver); 663 if (unlikely(err < 0)) 664 return err; 665 pd = platform_device_register_simple(SND_AICA_DRIVER, -1, 666 aica_memory_space, 2); 667 if (IS_ERR(pd)) { 668 platform_driver_unregister(&snd_aica_driver); 669 return PTR_ERR(pd); 670 } 671 /* Load the firmware */ 672 return load_aica_firmware(); 673 } 674 675 static void __exit aica_exit(void) 676 { 677 /* Destroy the aica kernel thread * 678 * being extra cautious to check if it exists*/ 679 if (likely(aica_queue)) 680 destroy_workqueue(aica_queue); 681 platform_device_unregister(pd); 682 platform_driver_unregister(&snd_aica_driver); 683 /* Kill any sound still playing and reset ARM7 to safe state */ 684 spu_reset(); 685 } 686 687 module_init(aica_init); 688 module_exit(aica_exit); 689