aboutsummaryrefslogtreecommitdiffstats
path: root/sound/sh/aica.c
blob: 131ec4812288e6043a1cfb2fa8bad7001ae6585e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
/*
* This code is licenced under 
* the General Public Licence
* version 2
*
* Copyright Adrian McMenamin 2005, 2006, 2007
* <adrian@mcmen.demon.co.uk>
* Requires firmware (BSD licenced) available from:
* http://linuxdc.cvs.sourceforge.net/linuxdc/linux-sh-dc/sound/oss/aica/firmware/
* or the maintainer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*/

#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/firmware.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/info.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/dreamcast/sysasic.h>
#include "aica.h"

MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");

/* module parameters */
#define CARD_NAME "AICA"
static int index = -1;
static char *id;
static int enable = 1;
module_param(index, int, 0444);
MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
module_param(id, charp, 0444);
MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
module_param(enable, bool, 0644);
MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");

/* Use workqueue */
static struct workqueue_struct *aica_queue;

/* Simple platform device */
static struct platform_device *pd;
static struct resource aica_memory_space[2] = {
	{
	 .name = "AICA ARM CONTROL",
	 .start = ARM_RESET_REGISTER,
	 .flags = IORESOURCE_MEM,
	 .end = ARM_RESET_REGISTER + 3,
	 },
	{
	 .name = "AICA Sound RAM",
	 .start = SPU_MEMORY_BASE,
	 .flags = IORESOURCE_MEM,
	 .end = SPU_MEMORY_BASE + 0x200000 - 1,
	 },
};

/* SPU specific functions */
/* spu_write_wait - wait for G2-SH FIFO to clear */
static void spu_write_wait(void)
{
	int time_count;
	time_count = 0;
	while (1) {
		if (!(readl(G2_FIFO) & 0x11))
			break;
		/* To ensure hardware failure doesn't wedge kernel */
		time_count++;
		if (time_count > 0x10000) {
			snd_printk
			    ("WARNING: G2 FIFO appears to be blocked.\n");
			break;
		}
	}
}

/* spu_memset - write to memory in SPU address space */
static void spu_memset(u32 toi, u32 what, int length)
{
	int i;
	snd_assert(length % 4 == 0, return);
	for (i = 0; i < length; i++) {
		if (!(i % 8))
			spu_write_wait();
		writel(what, toi + SPU_MEMORY_BASE);
		toi++;
	}
}

/* spu_memload - write to SPU address space */
static void spu_memload(u32 toi, void *from, int length)
{
	u32 *froml = from;
	u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
	int i;
	u32 val;
	length = DIV_ROUND_UP(length, 4);
	spu_write_wait();
	for (i = 0; i < length; i++) {
		if (!(i % 8))
			spu_write_wait();
		val = *froml;
		writel(val, to);
		froml++;
		to++;
	}
}

/* spu_disable - set spu registers to stop sound output */
static void spu_disable(void)
{
	int i;
	u32 regval;
	spu_write_wait();
	regval = readl(ARM_RESET_REGISTER);
	regval |= 1;
	spu_write_wait();
	writel(regval, ARM_RESET_REGISTER);
	for (i = 0; i < 64; i++) {
		spu_write_wait();
		regval = readl(SPU_REGISTER_BASE + (i * 0x80));
		regval = (regval & ~0x4000) | 0x8000;
		spu_write_wait();
		writel(regval, SPU_REGISTER_BASE + (i * 0x80));
	}
}

/* spu_enable - set spu registers to enable sound output */
static void spu_enable(void)
{
	u32 regval = readl(ARM_RESET_REGISTER);
	regval &= ~1;
	spu_write_wait();
	writel(regval, ARM_RESET_REGISTER);
}

/* 
 * Halt the sound processor, clear the memory,
 * load some default ARM7 code, and then restart ARM7
*/
static void spu_reset(void)
{
	spu_disable();
	spu_memset(0, 0, 0x200000 / 4);
	/* Put ARM7 in endless loop */
	ctrl_outl(0xea000002, SPU_MEMORY_BASE);
	spu_enable();
}

/* aica_chn_start - write to spu to start playback */
static void aica_chn_start(void)
{
	spu_write_wait();
	writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
}

/* aica_chn_halt - write to spu to halt playback */
static void aica_chn_halt(void)
{
	spu_write_wait();
	writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
}

/* ALSA code below */
static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
	.info = (SNDRV_PCM_INFO_NONINTERLEAVED),
	.formats =
	    (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
	     SNDRV_PCM_FMTBIT_IMA_ADPCM),
	.rates = SNDRV_PCM_RATE_8000_48000,
	.rate_min = 8000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 2,
	.buffer_bytes_max = AICA_BUFFER_SIZE,
	.period_bytes_min = AICA_PERIOD_SIZE,
	.period_bytes_max = AICA_PERIOD_SIZE,
	.periods_min = AICA_PERIOD_NUMBER,
	.periods_max = AICA_PERIOD_NUMBER,
};

static int aica_dma_transfer(int channels, int buffer_size,
			     struct snd_pcm_substream *substream)
{
	int q, err, period_offset;
	struct snd_card_aica *dreamcastcard;
	struct snd_pcm_runtime *runtime;
	err = 0;
	dreamcastcard = substream->pcm->private_data;
	period_offset = dreamcastcard->clicks;
	period_offset %= (AICA_PERIOD_NUMBER / channels);
	runtime = substream->runtime;
	for (q = 0; q < channels; q++) {
		err = dma_xfer(AICA_DMA_CHANNEL,
			       (unsigned long) (runtime->dma_area +
						(AICA_BUFFER_SIZE * q) /
						channels +
						AICA_PERIOD_SIZE *
						period_offset),
			       AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
			       AICA_PERIOD_SIZE * period_offset,
			       buffer_size / channels, AICA_DMA_MODE);
		if (unlikely(err < 0))
			break;
		dma_wait_for_completion(AICA_DMA_CHANNEL);
	}
	return err;
}

static void startup_aica(struct snd_card_aica *dreamcastcard)
{
	spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
		    dreamcastcard->channel, sizeof(struct aica_channel));
	aica_chn_start();
}

static void run_spu_dma(struct work_struct *work)
{
	int buffer_size;
	struct snd_pcm_runtime *runtime;
	struct snd_card_aica *dreamcastcard;
	dreamcastcard =
	    container_of(work, struct snd_card_aica, spu_dma_work);
	runtime = dreamcastcard->substream->runtime;
	if (unlikely(dreamcastcard->dma_check == 0)) {
		buffer_size =
		    frames_to_bytes(runtime, runtime->buffer_size);
		if (runtime->channels > 1)
			dreamcastcard->channel->flags |= 0x01;
		aica_dma_transfer(runtime->channels, buffer_size,
				  dreamcastcard->substream);
		startup_aica(dreamcastcard);
		dreamcastcard->clicks =
		    buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
		return;
	} else {
		aica_dma_transfer(runtime->channels,
				  AICA_PERIOD_SIZE * runtime->channels,
				  dreamcastcard->substream);
		snd_pcm_period_elapsed(dreamcastcard->substream);
		dreamcastcard->clicks++;
		if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
			dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
		mod_timer(&dreamcastcard->timer, jiffies + 1);
	}
}

static void aica_period_elapsed(unsigned long timer_var)
{
	/*timer function - so cannot sleep */
	int play_period;
	struct snd_pcm_runtime *runtime;
	struct snd_pcm_substream *substream;
	struct snd_card_aica *dreamcastcard;
	substream = (struct snd_pcm_substream *) timer_var;
	runtime = substream->runtime;
	dreamcastcard = substream->pcm->private_data;
	/* Have we played out an additional period? */
	play_period =
	    frames_to_bytes(runtime,
			    readl
			    (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
	    AICA_PERIOD_SIZE;
	if (play_period == dreamcastcard->current_period) {
		/* reschedule the timer */
		mod_timer(&(dreamcastcard->timer), jiffies + 1);
		return;
	}
	if (runtime->channels > 1)
		dreamcastcard->current_period = play_period;
	if (unlikely(dreamcastcard->dma_check == 0))
		dreamcastcard->dma_check = 1;
	queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
}

static void spu_begin_dma(struct snd_pcm_substream *substream)
{
	struct snd_card_aica *dreamcastcard;
	struct snd_pcm_runtime *runtime;
	runtime = substream->runtime;
	dreamcastcard = substream->pcm->private_data;
	/*get the queue to do the work */
	queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
	/* Timer may already be running */
	if (unlikely(dreamcastcard->timer.data)) {
		mod_timer(&dreamcastcard->timer, jiffies + 4);
		return;
	}
	init_timer(&(dreamcastcard->timer));
	dreamcastcard->timer.data = (unsigned long) substream;
	dreamcastcard->timer.function = aica_period_elapsed;
	dreamcastcard->timer.expires = jiffies + 4;
	add_timer(&(dreamcastcard->timer));
}

static int snd_aicapcm_pcm_open(struct snd_pcm_substream
				*substream)
{
	struct snd_pcm_runtime *runtime;
	struct aica_channel *channel;
	struct snd_card_aica *dreamcastcard;
	if (!enable)
		return -ENOENT;
	dreamcastcard = substream->pcm->private_data;
	channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
	if (!channel)
		return -ENOMEM;
	/* set defaults for channel */
	channel->sfmt = SM_8BIT;
	channel->cmd = AICA_CMD_START;
	channel->vol = dreamcastcard->master_volume;
	channel->pan = 0x80;
	channel->pos = 0;
	channel->flags = 0;	/* default to mono */
	dreamcastcard->channel = channel;
	runtime = substream->runtime;
	runtime->hw = snd_pcm_aica_playback_hw;
	spu_enable();
	dreamcastcard->clicks = 0;
	dreamcastcard->current_period = 0;
	dreamcastcard->dma_check = 0;
	return 0;
}

static int snd_aicapcm_pcm_close(struct snd_pcm_substream
				 *substream)
{
	struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
	flush_workqueue(aica_queue);
	if (dreamcastcard->timer.data)
		del_timer(&dreamcastcard->timer);
	kfree(dreamcastcard->channel);
	spu_disable();
	return 0;
}

static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
				   *substream)
{
	/* Free the DMA buffer */
	return snd_pcm_lib_free_pages(substream);
}

static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
				     *substream, struct snd_pcm_hw_params
				     *hw_params)
{
	/* Allocate a DMA buffer using ALSA built-ins */
	return
	    snd_pcm_lib_malloc_pages(substream,
				     params_buffer_bytes(hw_params));
}

static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
				   *substream)
{
	struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
	if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
		dreamcastcard->channel->sfmt = SM_16BIT;
	dreamcastcard->channel->freq = substream->runtime->rate;
	dreamcastcard->substream = substream;
	return 0;
}

static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
				   *substream, int cmd)
{
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		spu_begin_dma(substream);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		aica_chn_halt();
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
					     *substream)
{
	return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
}

static struct snd_pcm_ops snd_aicapcm_playback_ops = {
	.open = snd_aicapcm_pcm_open,
	.close = snd_aicapcm_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = snd_aicapcm_pcm_hw_params,
	.hw_free = snd_aicapcm_pcm_hw_free,
	.prepare = snd_aicapcm_pcm_prepare,
	.trigger = snd_aicapcm_pcm_trigger,
	.pointer = snd_aicapcm_pcm_pointer,
};

/* TO DO: set up to handle more than one pcm instance */
static int __init snd_aicapcmchip(struct snd_card_aica
				  *dreamcastcard, int pcm_index)
{
	struct snd_pcm *pcm;
	int err;
	/* AICA has no capture ability */
	err =
	    snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
			&pcm);
	if (unlikely(err < 0))
		return err;
	pcm->private_data = dreamcastcard;
	strcpy(pcm->name, "AICA PCM");
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
			&snd_aicapcm_playback_ops);
	/* Allocate the DMA buffers */
	err =
	    snd_pcm_lib_preallocate_pages_for_all(pcm,
						  SNDRV_DMA_TYPE_CONTINUOUS,
						  snd_dma_continuous_data
						  (GFP_KERNEL),
						  AICA_BUFFER_SIZE,
						  AICA_BUFFER_SIZE);
	return err;
}

/* Mixer controls */
#define aica_pcmswitch_info		snd_ctl_boolean_mono_info

static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	ucontrol->value.integer.value[0] = 1;	/* TO DO: Fix me */
	return 0;
}

static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	if (ucontrol->value.integer.value[0] == 1)
		return 0;	/* TO DO: Fix me */
	else
		aica_chn_halt();
	return 0;
}

static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	uinfo->count = 1;
	uinfo->value.integer.min = 0;
	uinfo->value.integer.max = 0xFF;
	return 0;
}

static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	struct snd_card_aica *dreamcastcard;
	dreamcastcard = kcontrol->private_data;
	if (unlikely(!dreamcastcard->channel))
		return -ETXTBSY;	/* we've not yet been set up */
	ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
	return 0;
}

static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *ucontrol)
{
	struct snd_card_aica *dreamcastcard;
	dreamcastcard = kcontrol->private_data;
	if (unlikely(!dreamcastcard->channel))
		return -ETXTBSY;
	if (unlikely(dreamcastcard->channel->vol ==
		     ucontrol->value.integer.value[0]))
		return 0;
	dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
	dreamcastcard->master_volume = ucontrol->value.integer.value[0];
	spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
		    dreamcastcard->channel, sizeof(struct aica_channel));
	return 1;
}

static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Playback Switch",
	.index = 0,
	.info = aica_pcmswitch_info,
	.get = aica_pcmswitch_get,
	.put = aica_pcmswitch_put
};

static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	.name = "PCM Playback Volume",
	.index = 0,
	.info = aica_pcmvolume_info,
	.get = aica_pcmvolume_get,
	.put = aica_pcmvolume_put
};

static int load_aica_firmware(void)
{
	int err;
	const struct firmware *fw_entry;
	spu_reset();
	err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
	if (unlikely(err))
		return err;
	/* write firware into memory */
	spu_disable();
	spu_memload(0, fw_entry->data, fw_entry->size);
	spu_enable();
	release_firmware(fw_entry);
	return err;
}

static int __devinit add_aicamixer_controls(struct snd_card_aica
					    *dreamcastcard)
{
	int err;
	err = snd_ctl_add
	    (dreamcastcard->card,
	     snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
	if (unlikely(err < 0))
		return err;
	err = snd_ctl_add
	    (dreamcastcard->card,
	     snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
	if (unlikely(err < 0))
		return err;
	return 0;
}

static int snd_aica_remove(struct platform_device *devptr)
{
	struct snd_card_aica *dreamcastcard;
	dreamcastcard = platform_get_drvdata(devptr);
	if (unlikely(!dreamcastcard))
		return -ENODEV;
	snd_card_free(dreamcastcard->card);
	kfree(dreamcastcard);
	platform_set_drvdata(devptr, NULL);
	return 0;
}

static int __init snd_aica_probe(struct platform_device *devptr)
{
	int err;
	struct snd_card_aica *dreamcastcard;
	dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
	if (unlikely(!dreamcastcard))
		return -ENOMEM;
	dreamcastcard->card =
	    snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
	if (unlikely(!dreamcastcard->card)) {
		kfree(dreamcastcard);
		return -ENODEV;
	}
	strcpy(dreamcastcard->card->driver, "snd_aica");
	strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
	strcpy(dreamcastcard->card->longname,
	       "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
	/* Prepare to use the queue */
	INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
	/* Load the PCM 'chip' */
	err = snd_aicapcmchip(dreamcastcard, 0);
	if (unlikely(err < 0))
		goto freedreamcast;
	snd_card_set_dev(dreamcastcard->card, &devptr->dev);
	dreamcastcard->timer.data = 0;
	dreamcastcard->channel = NULL;
	/* Add basic controls */
	err = add_aicamixer_controls(dreamcastcard);
	if (unlikely(err < 0))
		goto freedreamcast;
	/* Register the card with ALSA subsystem */
	err = snd_card_register(dreamcastcard->card);
	if (unlikely(err < 0))
		goto freedreamcast;
	platform_set_drvdata(devptr, dreamcastcard);
	aica_queue = create_workqueue(CARD_NAME);
	if (unlikely(!aica_queue))
		goto freedreamcast;
	snd_printk
	    ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
	return 0;
      freedreamcast:
	snd_card_free(dreamcastcard->card);
	kfree(dreamcastcard);
	return err;
}

static struct platform_driver snd_aica_driver = {
	.probe = snd_aica_probe,
	.remove = snd_aica_remove,
	.driver = {
		   .name = SND_AICA_DRIVER},
};

static int __init aica_init(void)
{
	int err;
	err = platform_driver_register(&snd_aica_driver);
	if (unlikely(err < 0))
		return err;
	pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
					     aica_memory_space, 2);
	if (unlikely(IS_ERR(pd))) {
		platform_driver_unregister(&snd_aica_driver);
		return PTR_ERR(pd);
	}
	/* Load the firmware */
	return load_aica_firmware();
}

static void __exit aica_exit(void)
{
	/* Destroy the aica kernel thread            *
	 * being extra cautious to check if it exists*/
	if (likely(aica_queue))
		destroy_workqueue(aica_queue);
	platform_device_unregister(pd);
	platform_driver_unregister(&snd_aica_driver);
	/* Kill any sound still playing and reset ARM7 to safe state */
	spu_reset();
}

module_init(aica_init);
module_exit(aica_exit);