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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
48MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
49MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
50MODULE_LICENSE("GPL");
51MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
52MODULE_FIRMWARE("aica_firmware.bin");
53
54/* module parameters */
55#define CARD_NAME "AICA"
56static int index = -1;
57static char *id;
58static bool enable = 1;
59module_param(index, int, 0444);
60MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
61module_param(id, charp, 0444);
62MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
63module_param(enable, bool, 0644);
64MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
65
66/* Simple platform device */
67static struct platform_device *pd;
68static 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 */
85static 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 */
103static 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 */
120static 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 */
142static 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 */
166static 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*/
181static 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 */
194static 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 */
204static 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 */
214static 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
231static 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
264static 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
271static 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
302static 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->timer_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
330static 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 /* Timer may already be running */
339 if (unlikely(dreamcastcard->timer_substream)) {
340 mod_timer(&dreamcastcard->timer, jiffies + 4);
341 return;
342 }
343 timer_setup(&dreamcastcard->timer, aica_period_elapsed, 0);
344 dreamcastcard->timer_substream = substream;
345 mod_timer(&dreamcastcard->timer, jiffies + 4);
346}
347
348static int snd_aicapcm_pcm_open(struct snd_pcm_substream
349 *substream)
350{
351 struct snd_pcm_runtime *runtime;
352 struct aica_channel *channel;
353 struct snd_card_aica *dreamcastcard;
354 if (!enable)
355 return -ENOENT;
356 dreamcastcard = substream->pcm->private_data;
357 channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
358 if (!channel)
359 return -ENOMEM;
360 /* set defaults for channel */
361 channel->sfmt = SM_8BIT;
362 channel->cmd = AICA_CMD_START;
363 channel->vol = dreamcastcard->master_volume;
364 channel->pan = 0x80;
365 channel->pos = 0;
366 channel->flags = 0; /* default to mono */
367 dreamcastcard->channel = channel;
368 runtime = substream->runtime;
369 runtime->hw = snd_pcm_aica_playback_hw;
370 spu_enable();
371 dreamcastcard->clicks = 0;
372 dreamcastcard->current_period = 0;
373 dreamcastcard->dma_check = 0;
374 return 0;
375}
376
377static int snd_aicapcm_pcm_close(struct snd_pcm_substream
378 *substream)
379{
380 struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
381 flush_work(&(dreamcastcard->spu_dma_work));
382 if (dreamcastcard->timer_substream)
383 del_timer(&dreamcastcard->timer);
384 kfree(dreamcastcard->channel);
385 spu_disable();
386 return 0;
387}
388
389static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
390 *substream)
391{
392 /* Free the DMA buffer */
393 return snd_pcm_lib_free_pages(substream);
394}
395
396static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
397 *substream, struct snd_pcm_hw_params
398 *hw_params)
399{
400 /* Allocate a DMA buffer using ALSA built-ins */
401 return
402 snd_pcm_lib_malloc_pages(substream,
403 params_buffer_bytes(hw_params));
404}
405
406static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
407 *substream)
408{
409 struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
410 if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
411 dreamcastcard->channel->sfmt = SM_16BIT;
412 dreamcastcard->channel->freq = substream->runtime->rate;
413 dreamcastcard->substream = substream;
414 return 0;
415}
416
417static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
418 *substream, int cmd)
419{
420 switch (cmd) {
421 case SNDRV_PCM_TRIGGER_START:
422 spu_begin_dma(substream);
423 break;
424 case SNDRV_PCM_TRIGGER_STOP:
425 aica_chn_halt();
426 break;
427 default:
428 return -EINVAL;
429 }
430 return 0;
431}
432
433static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
434 *substream)
435{
436 return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
437}
438
439static const struct snd_pcm_ops snd_aicapcm_playback_ops = {
440 .open = snd_aicapcm_pcm_open,
441 .close = snd_aicapcm_pcm_close,
442 .ioctl = snd_pcm_lib_ioctl,
443 .hw_params = snd_aicapcm_pcm_hw_params,
444 .hw_free = snd_aicapcm_pcm_hw_free,
445 .prepare = snd_aicapcm_pcm_prepare,
446 .trigger = snd_aicapcm_pcm_trigger,
447 .pointer = snd_aicapcm_pcm_pointer,
448};
449
450/* TO DO: set up to handle more than one pcm instance */
451static int __init snd_aicapcmchip(struct snd_card_aica
452 *dreamcastcard, int pcm_index)
453{
454 struct snd_pcm *pcm;
455 int err;
456 /* AICA has no capture ability */
457 err =
458 snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
459 &pcm);
460 if (unlikely(err < 0))
461 return err;
462 pcm->private_data = dreamcastcard;
463 strcpy(pcm->name, "AICA PCM");
464 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
465 &snd_aicapcm_playback_ops);
466 /* Allocate the DMA buffers */
467 err =
468 snd_pcm_lib_preallocate_pages_for_all(pcm,
469 SNDRV_DMA_TYPE_CONTINUOUS,
470 snd_dma_continuous_data
471 (GFP_KERNEL),
472 AICA_BUFFER_SIZE,
473 AICA_BUFFER_SIZE);
474 return err;
475}
476
477/* Mixer controls */
478#define aica_pcmswitch_info snd_ctl_boolean_mono_info
479
480static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
481 struct snd_ctl_elem_value *ucontrol)
482{
483 ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */
484 return 0;
485}
486
487static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
488 struct snd_ctl_elem_value *ucontrol)
489{
490 if (ucontrol->value.integer.value[0] == 1)
491 return 0; /* TO DO: Fix me */
492 else
493 aica_chn_halt();
494 return 0;
495}
496
497static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
498 struct snd_ctl_elem_info *uinfo)
499{
500 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
501 uinfo->count = 1;
502 uinfo->value.integer.min = 0;
503 uinfo->value.integer.max = 0xFF;
504 return 0;
505}
506
507static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
508 struct snd_ctl_elem_value *ucontrol)
509{
510 struct snd_card_aica *dreamcastcard;
511 dreamcastcard = kcontrol->private_data;
512 if (unlikely(!dreamcastcard->channel))
513 return -ETXTBSY; /* we've not yet been set up */
514 ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
515 return 0;
516}
517
518static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
519 struct snd_ctl_elem_value *ucontrol)
520{
521 struct snd_card_aica *dreamcastcard;
522 unsigned int vol;
523 dreamcastcard = kcontrol->private_data;
524 if (unlikely(!dreamcastcard->channel))
525 return -ETXTBSY;
526 vol = ucontrol->value.integer.value[0];
527 if (vol > 0xff)
528 return -EINVAL;
529 if (unlikely(dreamcastcard->channel->vol == vol))
530 return 0;
531 dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
532 dreamcastcard->master_volume = ucontrol->value.integer.value[0];
533 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
534 dreamcastcard->channel, sizeof(struct aica_channel));
535 return 1;
536}
537
538static const struct snd_kcontrol_new snd_aica_pcmswitch_control = {
539 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
540 .name = "PCM Playback Switch",
541 .index = 0,
542 .info = aica_pcmswitch_info,
543 .get = aica_pcmswitch_get,
544 .put = aica_pcmswitch_put
545};
546
547static const struct snd_kcontrol_new snd_aica_pcmvolume_control = {
548 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
549 .name = "PCM Playback Volume",
550 .index = 0,
551 .info = aica_pcmvolume_info,
552 .get = aica_pcmvolume_get,
553 .put = aica_pcmvolume_put
554};
555
556static int load_aica_firmware(void)
557{
558 int err;
559 const struct firmware *fw_entry;
560 spu_reset();
561 err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
562 if (unlikely(err))
563 return err;
564 /* write firmware into memory */
565 spu_disable();
566 spu_memload(0, fw_entry->data, fw_entry->size);
567 spu_enable();
568 release_firmware(fw_entry);
569 return err;
570}
571
572static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard)
573{
574 int err;
575 err = snd_ctl_add
576 (dreamcastcard->card,
577 snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
578 if (unlikely(err < 0))
579 return err;
580 err = snd_ctl_add
581 (dreamcastcard->card,
582 snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
583 if (unlikely(err < 0))
584 return err;
585 return 0;
586}
587
588static int snd_aica_remove(struct platform_device *devptr)
589{
590 struct snd_card_aica *dreamcastcard;
591 dreamcastcard = platform_get_drvdata(devptr);
592 if (unlikely(!dreamcastcard))
593 return -ENODEV;
594 snd_card_free(dreamcastcard->card);
595 kfree(dreamcastcard);
596 return 0;
597}
598
599static int snd_aica_probe(struct platform_device *devptr)
600{
601 int err;
602 struct snd_card_aica *dreamcastcard;
603 dreamcastcard = kzalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
604 if (unlikely(!dreamcastcard))
605 return -ENOMEM;
606 err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER,
607 THIS_MODULE, 0, &dreamcastcard->card);
608 if (unlikely(err < 0)) {
609 kfree(dreamcastcard);
610 return err;
611 }
612 strcpy(dreamcastcard->card->driver, "snd_aica");
613 strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
614 strcpy(dreamcastcard->card->longname,
615 "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
616 /* Prepare to use the queue */
617 INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
618 /* Load the PCM 'chip' */
619 err = snd_aicapcmchip(dreamcastcard, 0);
620 if (unlikely(err < 0))
621 goto freedreamcast;
622 /* Add basic controls */
623 err = add_aicamixer_controls(dreamcastcard);
624 if (unlikely(err < 0))
625 goto freedreamcast;
626 /* Register the card with ALSA subsystem */
627 err = snd_card_register(dreamcastcard->card);
628 if (unlikely(err < 0))
629 goto freedreamcast;
630 platform_set_drvdata(devptr, dreamcastcard);
631 snd_printk
632 ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
633 return 0;
634 freedreamcast:
635 snd_card_free(dreamcastcard->card);
636 kfree(dreamcastcard);
637 return err;
638}
639
640static struct platform_driver snd_aica_driver = {
641 .probe = snd_aica_probe,
642 .remove = snd_aica_remove,
643 .driver = {
644 .name = SND_AICA_DRIVER,
645 },
646};
647
648static int __init aica_init(void)
649{
650 int err;
651 err = platform_driver_register(&snd_aica_driver);
652 if (unlikely(err < 0))
653 return err;
654 pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
655 aica_memory_space, 2);
656 if (IS_ERR(pd)) {
657 platform_driver_unregister(&snd_aica_driver);
658 return PTR_ERR(pd);
659 }
660 /* Load the firmware */
661 return load_aica_firmware();
662}
663
664static void __exit aica_exit(void)
665{
666 platform_device_unregister(pd);
667 platform_driver_unregister(&snd_aica_driver);
668 /* Kill any sound still playing and reset ARM7 to safe state */
669 spu_reset();
670}
671
672module_init(aica_init);
673module_exit(aica_exit);
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
48MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
49MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
50MODULE_LICENSE("GPL");
51MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
52MODULE_FIRMWARE("aica_firmware.bin");
53
54/* module parameters */
55#define CARD_NAME "AICA"
56static int index = -1;
57static char *id;
58static bool enable = 1;
59module_param(index, int, 0444);
60MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
61module_param(id, charp, 0444);
62MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
63module_param(enable, bool, 0644);
64MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
65
66/* Use workqueue */
67static struct workqueue_struct *aica_queue;
68
69/* Simple platform device */
70static struct platform_device *pd;
71static 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 */
88static 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 */
106static 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 */
123static 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 */
145static 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 */
169static 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*/
184static 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 */
197static 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 */
207static 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 */
217static 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
234static 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
267static 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
274static 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
305static 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
333static 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 setup_timer(&dreamcastcard->timer, aica_period_elapsed,
347 (unsigned long) substream);
348 mod_timer(&dreamcastcard->timer, jiffies + 4);
349}
350
351static int snd_aicapcm_pcm_open(struct snd_pcm_substream
352 *substream)
353{
354 struct snd_pcm_runtime *runtime;
355 struct aica_channel *channel;
356 struct snd_card_aica *dreamcastcard;
357 if (!enable)
358 return -ENOENT;
359 dreamcastcard = substream->pcm->private_data;
360 channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
361 if (!channel)
362 return -ENOMEM;
363 /* set defaults for channel */
364 channel->sfmt = SM_8BIT;
365 channel->cmd = AICA_CMD_START;
366 channel->vol = dreamcastcard->master_volume;
367 channel->pan = 0x80;
368 channel->pos = 0;
369 channel->flags = 0; /* default to mono */
370 dreamcastcard->channel = channel;
371 runtime = substream->runtime;
372 runtime->hw = snd_pcm_aica_playback_hw;
373 spu_enable();
374 dreamcastcard->clicks = 0;
375 dreamcastcard->current_period = 0;
376 dreamcastcard->dma_check = 0;
377 return 0;
378}
379
380static int snd_aicapcm_pcm_close(struct snd_pcm_substream
381 *substream)
382{
383 struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
384 flush_workqueue(aica_queue);
385 if (dreamcastcard->timer.data)
386 del_timer(&dreamcastcard->timer);
387 kfree(dreamcastcard->channel);
388 spu_disable();
389 return 0;
390}
391
392static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
393 *substream)
394{
395 /* Free the DMA buffer */
396 return snd_pcm_lib_free_pages(substream);
397}
398
399static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
400 *substream, struct snd_pcm_hw_params
401 *hw_params)
402{
403 /* Allocate a DMA buffer using ALSA built-ins */
404 return
405 snd_pcm_lib_malloc_pages(substream,
406 params_buffer_bytes(hw_params));
407}
408
409static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
410 *substream)
411{
412 struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
413 if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
414 dreamcastcard->channel->sfmt = SM_16BIT;
415 dreamcastcard->channel->freq = substream->runtime->rate;
416 dreamcastcard->substream = substream;
417 return 0;
418}
419
420static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
421 *substream, int cmd)
422{
423 switch (cmd) {
424 case SNDRV_PCM_TRIGGER_START:
425 spu_begin_dma(substream);
426 break;
427 case SNDRV_PCM_TRIGGER_STOP:
428 aica_chn_halt();
429 break;
430 default:
431 return -EINVAL;
432 }
433 return 0;
434}
435
436static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
437 *substream)
438{
439 return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
440}
441
442static struct snd_pcm_ops snd_aicapcm_playback_ops = {
443 .open = snd_aicapcm_pcm_open,
444 .close = snd_aicapcm_pcm_close,
445 .ioctl = snd_pcm_lib_ioctl,
446 .hw_params = snd_aicapcm_pcm_hw_params,
447 .hw_free = snd_aicapcm_pcm_hw_free,
448 .prepare = snd_aicapcm_pcm_prepare,
449 .trigger = snd_aicapcm_pcm_trigger,
450 .pointer = snd_aicapcm_pcm_pointer,
451};
452
453/* TO DO: set up to handle more than one pcm instance */
454static int __init snd_aicapcmchip(struct snd_card_aica
455 *dreamcastcard, int pcm_index)
456{
457 struct snd_pcm *pcm;
458 int err;
459 /* AICA has no capture ability */
460 err =
461 snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
462 &pcm);
463 if (unlikely(err < 0))
464 return err;
465 pcm->private_data = dreamcastcard;
466 strcpy(pcm->name, "AICA PCM");
467 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
468 &snd_aicapcm_playback_ops);
469 /* Allocate the DMA buffers */
470 err =
471 snd_pcm_lib_preallocate_pages_for_all(pcm,
472 SNDRV_DMA_TYPE_CONTINUOUS,
473 snd_dma_continuous_data
474 (GFP_KERNEL),
475 AICA_BUFFER_SIZE,
476 AICA_BUFFER_SIZE);
477 return err;
478}
479
480/* Mixer controls */
481#define aica_pcmswitch_info snd_ctl_boolean_mono_info
482
483static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
484 struct snd_ctl_elem_value *ucontrol)
485{
486 ucontrol->value.integer.value[0] = 1; /* TO DO: Fix me */
487 return 0;
488}
489
490static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
491 struct snd_ctl_elem_value *ucontrol)
492{
493 if (ucontrol->value.integer.value[0] == 1)
494 return 0; /* TO DO: Fix me */
495 else
496 aica_chn_halt();
497 return 0;
498}
499
500static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
501 struct snd_ctl_elem_info *uinfo)
502{
503 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
504 uinfo->count = 1;
505 uinfo->value.integer.min = 0;
506 uinfo->value.integer.max = 0xFF;
507 return 0;
508}
509
510static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
511 struct snd_ctl_elem_value *ucontrol)
512{
513 struct snd_card_aica *dreamcastcard;
514 dreamcastcard = kcontrol->private_data;
515 if (unlikely(!dreamcastcard->channel))
516 return -ETXTBSY; /* we've not yet been set up */
517 ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
518 return 0;
519}
520
521static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
522 struct snd_ctl_elem_value *ucontrol)
523{
524 struct snd_card_aica *dreamcastcard;
525 unsigned int vol;
526 dreamcastcard = kcontrol->private_data;
527 if (unlikely(!dreamcastcard->channel))
528 return -ETXTBSY;
529 vol = ucontrol->value.integer.value[0];
530 if (vol > 0xff)
531 return -EINVAL;
532 if (unlikely(dreamcastcard->channel->vol == vol))
533 return 0;
534 dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
535 dreamcastcard->master_volume = ucontrol->value.integer.value[0];
536 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
537 dreamcastcard->channel, sizeof(struct aica_channel));
538 return 1;
539}
540
541static struct snd_kcontrol_new snd_aica_pcmswitch_control = {
542 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
543 .name = "PCM Playback Switch",
544 .index = 0,
545 .info = aica_pcmswitch_info,
546 .get = aica_pcmswitch_get,
547 .put = aica_pcmswitch_put
548};
549
550static struct snd_kcontrol_new snd_aica_pcmvolume_control = {
551 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
552 .name = "PCM Playback Volume",
553 .index = 0,
554 .info = aica_pcmvolume_info,
555 .get = aica_pcmvolume_get,
556 .put = aica_pcmvolume_put
557};
558
559static int load_aica_firmware(void)
560{
561 int err;
562 const struct firmware *fw_entry;
563 spu_reset();
564 err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
565 if (unlikely(err))
566 return err;
567 /* write firmware into memory */
568 spu_disable();
569 spu_memload(0, fw_entry->data, fw_entry->size);
570 spu_enable();
571 release_firmware(fw_entry);
572 return err;
573}
574
575static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard)
576{
577 int err;
578 err = snd_ctl_add
579 (dreamcastcard->card,
580 snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
581 if (unlikely(err < 0))
582 return err;
583 err = snd_ctl_add
584 (dreamcastcard->card,
585 snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
586 if (unlikely(err < 0))
587 return err;
588 return 0;
589}
590
591static int snd_aica_remove(struct platform_device *devptr)
592{
593 struct snd_card_aica *dreamcastcard;
594 dreamcastcard = platform_get_drvdata(devptr);
595 if (unlikely(!dreamcastcard))
596 return -ENODEV;
597 snd_card_free(dreamcastcard->card);
598 kfree(dreamcastcard);
599 return 0;
600}
601
602static int snd_aica_probe(struct platform_device *devptr)
603{
604 int err;
605 struct snd_card_aica *dreamcastcard;
606 dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
607 if (unlikely(!dreamcastcard))
608 return -ENOMEM;
609 err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER,
610 THIS_MODULE, 0, &dreamcastcard->card);
611 if (unlikely(err < 0)) {
612 kfree(dreamcastcard);
613 return err;
614 }
615 strcpy(dreamcastcard->card->driver, "snd_aica");
616 strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
617 strcpy(dreamcastcard->card->longname,
618 "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
619 /* Prepare to use the queue */
620 INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
621 /* Load the PCM 'chip' */
622 err = snd_aicapcmchip(dreamcastcard, 0);
623 if (unlikely(err < 0))
624 goto freedreamcast;
625 dreamcastcard->timer.data = 0;
626 dreamcastcard->channel = NULL;
627 /* Add basic controls */
628 err = add_aicamixer_controls(dreamcastcard);
629 if (unlikely(err < 0))
630 goto freedreamcast;
631 /* Register the card with ALSA subsystem */
632 err = snd_card_register(dreamcastcard->card);
633 if (unlikely(err < 0))
634 goto freedreamcast;
635 platform_set_drvdata(devptr, dreamcastcard);
636 aica_queue = create_workqueue(CARD_NAME);
637 if (unlikely(!aica_queue))
638 goto freedreamcast;
639 snd_printk
640 ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
641 return 0;
642 freedreamcast:
643 snd_card_free(dreamcastcard->card);
644 kfree(dreamcastcard);
645 return err;
646}
647
648static struct platform_driver snd_aica_driver = {
649 .probe = snd_aica_probe,
650 .remove = snd_aica_remove,
651 .driver = {
652 .name = SND_AICA_DRIVER,
653 },
654};
655
656static int __init aica_init(void)
657{
658 int err;
659 err = platform_driver_register(&snd_aica_driver);
660 if (unlikely(err < 0))
661 return err;
662 pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
663 aica_memory_space, 2);
664 if (IS_ERR(pd)) {
665 platform_driver_unregister(&snd_aica_driver);
666 return PTR_ERR(pd);
667 }
668 /* Load the firmware */
669 return load_aica_firmware();
670}
671
672static void __exit aica_exit(void)
673{
674 /* Destroy the aica kernel thread *
675 * being extra cautious to check if it exists*/
676 if (likely(aica_queue))
677 destroy_workqueue(aica_queue);
678 platform_device_unregister(pd);
679 platform_driver_unregister(&snd_aica_driver);
680 /* Kill any sound still playing and reset ARM7 to safe state */
681 spu_reset();
682}
683
684module_init(aica_init);
685module_exit(aica_exit);