1// SPDX-License-Identifier: GPL-2.0-only 2/* 3* 4* Copyright Adrian McMenamin 2005, 2006, 2007 5* <adrian@mcmen.demon.co.uk> 6* Requires firmware (BSD licenced) available from: 7* http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/ 8* or the maintainer 9*/ 10 11#include <linux/init.h> 12#include <linux/jiffies.h> 13#include <linux/slab.h> 14#include <linux/time.h> 15#include <linux/wait.h> 16#include <linux/module.h> 17#include <linux/platform_device.h> 18#include <linux/firmware.h> 19#include <linux/timer.h> 20#include <linux/delay.h> 21#include <linux/workqueue.h> 22#include <linux/io.h> 23#include <sound/core.h> 24#include <sound/control.h> 25#include <sound/pcm.h> 26#include <sound/initval.h> 27#include <sound/info.h> 28#include <asm/dma.h> 29#include <mach/sysasic.h> 30#include "aica.h" 31 32MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>"); 33MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver"); 34MODULE_LICENSE("GPL"); 35MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}"); 36MODULE_FIRMWARE("aica_firmware.bin"); 37 38/* module parameters */ 39#define CARD_NAME "AICA" 40static int index = -1; 41static char *id; 42static bool enable = 1; 43module_param(index, int, 0444); 44MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard."); 45module_param(id, charp, 0444); 46MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard."); 47module_param(enable, bool, 0644); 48MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard."); 49 50/* Simple platform device */ 51static struct platform_device *pd; 52static struct resource aica_memory_space[2] = { 53 { 54 .name = "AICA ARM CONTROL", 55 .start = ARM_RESET_REGISTER, 56 .flags = IORESOURCE_MEM, 57 .end = ARM_RESET_REGISTER + 3, 58 }, 59 { 60 .name = "AICA Sound RAM", 61 .start = SPU_MEMORY_BASE, 62 .flags = IORESOURCE_MEM, 63 .end = SPU_MEMORY_BASE + 0x200000 - 1, 64 }, 65}; 66 67/* SPU specific functions */ 68/* spu_write_wait - wait for G2-SH FIFO to clear */ 69static void spu_write_wait(void) 70{ 71 int time_count; 72 time_count = 0; 73 while (1) { 74 if (!(readl(G2_FIFO) & 0x11)) 75 break; 76 /* To ensure hardware failure doesn't wedge kernel */ 77 time_count++; 78 if (time_count > 0x10000) { 79 snd_printk 80 ("WARNING: G2 FIFO appears to be blocked.\n"); 81 break; 82 } 83 } 84} 85 86/* spu_memset - write to memory in SPU address space */ 87static void spu_memset(u32 toi, u32 what, int length) 88{ 89 int i; 90 unsigned long flags; 91 if (snd_BUG_ON(length % 4)) 92 return; 93 for (i = 0; i < length; i++) { 94 if (!(i % 8)) 95 spu_write_wait(); 96 local_irq_save(flags); 97 writel(what, toi + SPU_MEMORY_BASE); 98 local_irq_restore(flags); 99 toi++; 100 } 101} 102 103/* spu_memload - write to SPU address space */ 104static void spu_memload(u32 toi, const void *from, int length) 105{ 106 unsigned long flags; 107 const u32 *froml = from; 108 u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi); 109 int i; 110 u32 val; 111 length = DIV_ROUND_UP(length, 4); 112 spu_write_wait(); 113 for (i = 0; i < length; i++) { 114 if (!(i % 8)) 115 spu_write_wait(); 116 val = *froml; 117 local_irq_save(flags); 118 writel(val, to); 119 local_irq_restore(flags); 120 froml++; 121 to++; 122 } 123} 124 125/* spu_disable - set spu registers to stop sound output */ 126static void spu_disable(void) 127{ 128 int i; 129 unsigned long flags; 130 u32 regval; 131 spu_write_wait(); 132 regval = readl(ARM_RESET_REGISTER); 133 regval |= 1; 134 spu_write_wait(); 135 local_irq_save(flags); 136 writel(regval, ARM_RESET_REGISTER); 137 local_irq_restore(flags); 138 for (i = 0; i < 64; i++) { 139 spu_write_wait(); 140 regval = readl(SPU_REGISTER_BASE + (i * 0x80)); 141 regval = (regval & ~0x4000) | 0x8000; 142 spu_write_wait(); 143 local_irq_save(flags); 144 writel(regval, SPU_REGISTER_BASE + (i * 0x80)); 145 local_irq_restore(flags); 146 } 147} 148 149/* spu_enable - set spu registers to enable sound output */ 150static void spu_enable(void) 151{ 152 unsigned long flags; 153 u32 regval = readl(ARM_RESET_REGISTER); 154 regval &= ~1; 155 spu_write_wait(); 156 local_irq_save(flags); 157 writel(regval, ARM_RESET_REGISTER); 158 local_irq_restore(flags); 159} 160 161/* 162 * Halt the sound processor, clear the memory, 163 * load some default ARM7 code, and then restart ARM7 164*/ 165static void spu_reset(void) 166{ 167 unsigned long flags; 168 spu_disable(); 169 spu_memset(0, 0, 0x200000 / 4); 170 /* Put ARM7 in endless loop */ 171 local_irq_save(flags); 172 __raw_writel(0xea000002, SPU_MEMORY_BASE); 173 local_irq_restore(flags); 174 spu_enable(); 175} 176 177/* aica_chn_start - write to spu to start playback */ 178static void aica_chn_start(void) 179{ 180 unsigned long flags; 181 spu_write_wait(); 182 local_irq_save(flags); 183 writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT); 184 local_irq_restore(flags); 185} 186 187/* aica_chn_halt - write to spu to halt playback */ 188static void aica_chn_halt(void) 189{ 190 unsigned long flags; 191 spu_write_wait(); 192 local_irq_save(flags); 193 writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT); 194 local_irq_restore(flags); 195} 196 197/* ALSA code below */ 198static const struct snd_pcm_hardware snd_pcm_aica_playback_hw = { 199 .info = (SNDRV_PCM_INFO_NONINTERLEAVED), 200 .formats = 201 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | 202 SNDRV_PCM_FMTBIT_IMA_ADPCM), 203 .rates = SNDRV_PCM_RATE_8000_48000, 204 .rate_min = 8000, 205 .rate_max = 48000, 206 .channels_min = 1, 207 .channels_max = 2, 208 .buffer_bytes_max = AICA_BUFFER_SIZE, 209 .period_bytes_min = AICA_PERIOD_SIZE, 210 .period_bytes_max = AICA_PERIOD_SIZE, 211 .periods_min = AICA_PERIOD_NUMBER, 212 .periods_max = AICA_PERIOD_NUMBER, 213}; 214 215static int aica_dma_transfer(int channels, int buffer_size, 216 struct snd_pcm_substream *substream) 217{ 218 int q, err, period_offset; 219 struct snd_card_aica *dreamcastcard; 220 struct snd_pcm_runtime *runtime; 221 unsigned long flags; 222 err = 0; 223 dreamcastcard = substream->pcm->private_data; 224 period_offset = dreamcastcard->clicks; 225 period_offset %= (AICA_PERIOD_NUMBER / channels); 226 runtime = substream->runtime; 227 for (q = 0; q < channels; q++) { 228 local_irq_save(flags); 229 err = dma_xfer(AICA_DMA_CHANNEL, 230 (unsigned long) (runtime->dma_area + 231 (AICA_BUFFER_SIZE * q) / 232 channels + 233 AICA_PERIOD_SIZE * 234 period_offset), 235 AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET + 236 AICA_PERIOD_SIZE * period_offset, 237 buffer_size / channels, AICA_DMA_MODE); 238 if (unlikely(err < 0)) { 239 local_irq_restore(flags); 240 break; 241 } 242 dma_wait_for_completion(AICA_DMA_CHANNEL); 243 local_irq_restore(flags); 244 } 245 return err; 246} 247 248static void startup_aica(struct snd_card_aica *dreamcastcard) 249{ 250 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, 251 dreamcastcard->channel, sizeof(struct aica_channel)); 252 aica_chn_start(); 253} 254 255static void run_spu_dma(struct work_struct *work) 256{ 257 int buffer_size; 258 struct snd_pcm_runtime *runtime; 259 struct snd_card_aica *dreamcastcard; 260 dreamcastcard = 261 container_of(work, struct snd_card_aica, spu_dma_work); 262 runtime = dreamcastcard->substream->runtime; 263 if (unlikely(dreamcastcard->dma_check == 0)) { 264 buffer_size = 265 frames_to_bytes(runtime, runtime->buffer_size); 266 if (runtime->channels > 1) 267 dreamcastcard->channel->flags |= 0x01; 268 aica_dma_transfer(runtime->channels, buffer_size, 269 dreamcastcard->substream); 270 startup_aica(dreamcastcard); 271 dreamcastcard->clicks = 272 buffer_size / (AICA_PERIOD_SIZE * runtime->channels); 273 return; 274 } else { 275 aica_dma_transfer(runtime->channels, 276 AICA_PERIOD_SIZE * runtime->channels, 277 dreamcastcard->substream); 278 snd_pcm_period_elapsed(dreamcastcard->substream); 279 dreamcastcard->clicks++; 280 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER)) 281 dreamcastcard->clicks %= AICA_PERIOD_NUMBER; 282 mod_timer(&dreamcastcard->timer, jiffies + 1); 283 } 284} 285 286static void aica_period_elapsed(struct timer_list *t) 287{ 288 struct snd_card_aica *dreamcastcard = from_timer(dreamcastcard, 289 t, timer); 290 struct snd_pcm_substream *substream = dreamcastcard->substream; 291 /*timer function - so cannot sleep */ 292 int play_period; 293 struct snd_pcm_runtime *runtime; 294 runtime = substream->runtime; 295 dreamcastcard = substream->pcm->private_data; 296 /* Have we played out an additional period? */ 297 play_period = 298 frames_to_bytes(runtime, 299 readl 300 (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) / 301 AICA_PERIOD_SIZE; 302 if (play_period == dreamcastcard->current_period) { 303 /* reschedule the timer */ 304 mod_timer(&(dreamcastcard->timer), jiffies + 1); 305 return; 306 } 307 if (runtime->channels > 1) 308 dreamcastcard->current_period = play_period; 309 if (unlikely(dreamcastcard->dma_check == 0)) 310 dreamcastcard->dma_check = 1; 311 schedule_work(&(dreamcastcard->spu_dma_work)); 312} 313 314static void spu_begin_dma(struct snd_pcm_substream *substream) 315{ 316 struct snd_card_aica *dreamcastcard; 317 struct snd_pcm_runtime *runtime; 318 runtime = substream->runtime; 319 dreamcastcard = substream->pcm->private_data; 320 /*get the queue to do the work */ 321 schedule_work(&(dreamcastcard->spu_dma_work)); 322 mod_timer(&dreamcastcard->timer, jiffies + 4); 323} 324 325static int snd_aicapcm_pcm_open(struct snd_pcm_substream 326 *substream) 327{ 328 struct snd_pcm_runtime *runtime; 329 struct aica_channel *channel; 330 struct snd_card_aica *dreamcastcard; 331 if (!enable) 332 return -ENOENT; 333 dreamcastcard = substream->pcm->private_data; 334 channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL); 335 if (!channel) 336 return -ENOMEM; 337 /* set defaults for channel */ 338 channel->sfmt = SM_8BIT; 339 channel->cmd = AICA_CMD_START; 340 channel->vol = dreamcastcard->master_volume; 341 channel->pan = 0x80; 342 channel->pos = 0; 343 channel->flags = 0; /* default to mono */ 344 dreamcastcard->channel = channel; 345 runtime = substream->runtime; 346 runtime->hw = snd_pcm_aica_playback_hw; 347 spu_enable(); 348 dreamcastcard->clicks = 0; 349 dreamcastcard->current_period = 0; 350 dreamcastcard->dma_check = 0; 351 return 0; 352} 353 354static int snd_aicapcm_pcm_close(struct snd_pcm_substream 355 *substream) 356{ 357 struct snd_card_aica *dreamcastcard = substream->pcm->private_data; 358 flush_work(&(dreamcastcard->spu_dma_work)); 359 del_timer(&dreamcastcard->timer); 360 dreamcastcard->substream = NULL; 361 kfree(dreamcastcard->channel); 362 spu_disable(); 363 return 0; 364} 365 366static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream 367 *substream) 368{ 369 struct snd_card_aica *dreamcastcard = substream->pcm->private_data; 370 if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE) 371 dreamcastcard->channel->sfmt = SM_16BIT; 372 dreamcastcard->channel->freq = substream->runtime->rate; 373 dreamcastcard->substream = substream; 374 return 0; 375} 376 377static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream 378 *substream, int cmd) 379{ 380 switch (cmd) { 381 case SNDRV_PCM_TRIGGER_START: 382 spu_begin_dma(substream); 383 break; 384 case SNDRV_PCM_TRIGGER_STOP: 385 aica_chn_halt(); 386 break; 387 default: 388 return -EINVAL; 389 } 390 return 0; 391} 392 393static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream 394 *substream) 395{ 396 return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER); 397} 398 399static const struct snd_pcm_ops snd_aicapcm_playback_ops = { 400 .open = snd_aicapcm_pcm_open, 401 .close = snd_aicapcm_pcm_close, 402 .prepare = snd_aicapcm_pcm_prepare, 403 .trigger = snd_aicapcm_pcm_trigger, 404 .pointer = snd_aicapcm_pcm_pointer, 405}; 406 407/* TO DO: set up to handle more than one pcm instance */ 408static int __init snd_aicapcmchip(struct snd_card_aica 409 *dreamcastcard, int pcm_index) 410{ 411 struct snd_pcm *pcm; 412 int err; 413 /* AICA has no capture ability */ 414 err = 415 snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, 416 &pcm); 417 if (unlikely(err < 0)) 418 return err; 419 pcm->private_data = dreamcastcard; 420 strcpy(pcm->name, "AICA PCM"); 421 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 422 &snd_aicapcm_playback_ops); 423 /* Allocate the DMA buffers */ 424 snd_pcm_set_managed_buffer_all(pcm, 425 SNDRV_DMA_TYPE_CONTINUOUS, 426 NULL, 427 AICA_BUFFER_SIZE, 428 AICA_BUFFER_SIZE); 429 return 0; 430} 431 432/* Mixer controls */ 433#define aica_pcmswitch_info snd_ctl_boolean_mono_info 434 435static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol, 436 struct snd_ctl_elem_value *ucontrol) 437{ 438 ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */ 439 return 0; 440} 441 442static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol, 443 struct snd_ctl_elem_value *ucontrol) 444{ 445 if (ucontrol->value.integer.value[0] == 1) 446 return 0; /* TO DO: Fix me */ 447 else 448 aica_chn_halt(); 449 return 0; 450} 451 452static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol, 453 struct snd_ctl_elem_info *uinfo) 454{ 455 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; 456 uinfo->count = 1; 457 uinfo->value.integer.min = 0; 458 uinfo->value.integer.max = 0xFF; 459 return 0; 460} 461 462static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol, 463 struct snd_ctl_elem_value *ucontrol) 464{ 465 struct snd_card_aica *dreamcastcard; 466 dreamcastcard = kcontrol->private_data; 467 if (unlikely(!dreamcastcard->channel)) 468 return -ETXTBSY; /* we've not yet been set up */ 469 ucontrol->value.integer.value[0] = dreamcastcard->channel->vol; 470 return 0; 471} 472 473static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol, 474 struct snd_ctl_elem_value *ucontrol) 475{ 476 struct snd_card_aica *dreamcastcard; 477 unsigned int vol; 478 dreamcastcard = kcontrol->private_data; 479 if (unlikely(!dreamcastcard->channel)) 480 return -ETXTBSY; 481 vol = ucontrol->value.integer.value[0]; 482 if (vol > 0xff) 483 return -EINVAL; 484 if (unlikely(dreamcastcard->channel->vol == vol)) 485 return 0; 486 dreamcastcard->channel->vol = ucontrol->value.integer.value[0]; 487 dreamcastcard->master_volume = ucontrol->value.integer.value[0]; 488 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET, 489 dreamcastcard->channel, sizeof(struct aica_channel)); 490 return 1; 491} 492 493static const struct snd_kcontrol_new snd_aica_pcmswitch_control = { 494 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 495 .name = "PCM Playback Switch", 496 .index = 0, 497 .info = aica_pcmswitch_info, 498 .get = aica_pcmswitch_get, 499 .put = aica_pcmswitch_put 500}; 501 502static const struct snd_kcontrol_new snd_aica_pcmvolume_control = { 503 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, 504 .name = "PCM Playback Volume", 505 .index = 0, 506 .info = aica_pcmvolume_info, 507 .get = aica_pcmvolume_get, 508 .put = aica_pcmvolume_put 509}; 510 511static int load_aica_firmware(void) 512{ 513 int err; 514 const struct firmware *fw_entry; 515 spu_reset(); 516 err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev); 517 if (unlikely(err)) 518 return err; 519 /* write firmware into memory */ 520 spu_disable(); 521 spu_memload(0, fw_entry->data, fw_entry->size); 522 spu_enable(); 523 release_firmware(fw_entry); 524 return err; 525} 526 527static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard) 528{ 529 int err; 530 err = snd_ctl_add 531 (dreamcastcard->card, 532 snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard)); 533 if (unlikely(err < 0)) 534 return err; 535 err = snd_ctl_add 536 (dreamcastcard->card, 537 snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard)); 538 if (unlikely(err < 0)) 539 return err; 540 return 0; 541} 542 543static int snd_aica_remove(struct platform_device *devptr) 544{ 545 struct snd_card_aica *dreamcastcard; 546 dreamcastcard = platform_get_drvdata(devptr); 547 if (unlikely(!dreamcastcard)) 548 return -ENODEV; 549 snd_card_free(dreamcastcard->card); 550 kfree(dreamcastcard); 551 return 0; 552} 553 554static int snd_aica_probe(struct platform_device *devptr) 555{ 556 int err; 557 struct snd_card_aica *dreamcastcard; 558 dreamcastcard = kzalloc(sizeof(struct snd_card_aica), GFP_KERNEL); 559 if (unlikely(!dreamcastcard)) 560 return -ENOMEM; 561 err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER, 562 THIS_MODULE, 0, &dreamcastcard->card); 563 if (unlikely(err < 0)) { 564 kfree(dreamcastcard); 565 return err; 566 } 567 strcpy(dreamcastcard->card->driver, "snd_aica"); 568 strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER); 569 strcpy(dreamcastcard->card->longname, 570 "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast"); 571 /* Prepare to use the queue */ 572 INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma); 573 timer_setup(&dreamcastcard->timer, aica_period_elapsed, 0); 574 /* Load the PCM 'chip' */ 575 err = snd_aicapcmchip(dreamcastcard, 0); 576 if (unlikely(err < 0)) 577 goto freedreamcast; 578 /* Add basic controls */ 579 err = add_aicamixer_controls(dreamcastcard); 580 if (unlikely(err < 0)) 581 goto freedreamcast; 582 /* Register the card with ALSA subsystem */ 583 err = snd_card_register(dreamcastcard->card); 584 if (unlikely(err < 0)) 585 goto freedreamcast; 586 platform_set_drvdata(devptr, dreamcastcard); 587 snd_printk 588 ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n"); 589 return 0; 590 freedreamcast: 591 snd_card_free(dreamcastcard->card); 592 kfree(dreamcastcard); 593 return err; 594} 595 596static struct platform_driver snd_aica_driver = { 597 .probe = snd_aica_probe, 598 .remove = snd_aica_remove, 599 .driver = { 600 .name = SND_AICA_DRIVER, 601 }, 602}; 603 604static int __init aica_init(void) 605{ 606 int err; 607 err = platform_driver_register(&snd_aica_driver); 608 if (unlikely(err < 0)) 609 return err; 610 pd = platform_device_register_simple(SND_AICA_DRIVER, -1, 611 aica_memory_space, 2); 612 if (IS_ERR(pd)) { 613 platform_driver_unregister(&snd_aica_driver); 614 return PTR_ERR(pd); 615 } 616 /* Load the firmware */ 617 return load_aica_firmware(); 618} 619 620static void __exit aica_exit(void) 621{ 622 platform_device_unregister(pd); 623 platform_driver_unregister(&snd_aica_driver); 624 /* Kill any sound still playing and reset ARM7 to safe state */ 625 spu_reset(); 626} 627 628module_init(aica_init); 629module_exit(aica_exit); 630