[ALSA] Add ALSA support for the SEGA Dreamcast PCM device
[linux-3.10.git] / sound / sh / aica.c
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/driver.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/io.h>
45 #include <asm/dma.h>
46 #include <asm/dreamcast/sysasic.h>
47 #include "aica.h"
48
49 MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
50 MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
51 MODULE_LICENSE("GPL");
52 MODULE_SUPPORTED_DEVICE("{{Yamaha/SEGA, AICA}}");
53
54 /* module parameters */
55 #define CARD_NAME "AICA"
56 static int index = -1;
57 static char *id;
58 static int enable = 1;
59 module_param(index, int, 0444);
60 MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
61 module_param(id, charp, 0444);
62 MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
63 module_param(enable, bool, 0644);
64 MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
65
66 /* Use workqueue */
67
68 static struct spu_work_holder {
69         struct work_struct spu_dma_work;
70         void *sspointer;
71 } spu_working;
72
73 static struct workqueue_struct *aica_queue;
74
75 /* Simple platform device */
76 static struct platform_device *pd;
77 static struct resource aica_memory_space[2] = {
78         {
79          .name = "AICA ARM CONTROL",
80          .start = ARM_RESET_REGISTER,
81          .flags = IORESOURCE_MEM,
82          .end = ARM_RESET_REGISTER + 3,
83          },
84         {
85          .name = "AICA Sound RAM",
86          .start = SPU_MEMORY_BASE,
87          .flags = IORESOURCE_MEM,
88          .end = SPU_MEMORY_BASE + 0x200000 - 1,
89          },
90 };
91
92 /* SPU specific functions */
93 /* spu_write_wait - wait for G2-SH FIFO to clear */
94 static void spu_write_wait(void)
95 {
96         int time_count;
97         time_count = 0;
98         while (1) {
99                 if (!(readl(G2_FIFO) & 0x11))
100                         break;
101                 /* To ensure hardware failure doesn't wedge kernel */
102                 time_count++;
103                 if (time_count > 0x10000)
104                 {
105                         snd_printk("WARNING: G2 FIFO appears to be blocked.\n");
106                         break;
107                 }
108         }
109 }
110
111 /* spu_memset - write to memory in SPU address space */
112 static void spu_memset(u32 toi, u32 what, int length)
113 {
114         int i;
115         snd_assert(length % 4 == 0, return);
116         for (i = 0; i < length; i++) {
117                 if (!(i % 8))
118                         spu_write_wait();
119                 writel(what, toi + SPU_MEMORY_BASE);
120                 toi++;
121         }
122 }
123
124 /* spu_memload - write to SPU address space */
125 static void spu_memload(u32 toi, void *from, int length)
126 {
127         u32 *froml = from;
128         u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
129         int i;
130         u32 val;
131         length = DIV_ROUND_UP(length, 4);
132         spu_write_wait();
133         for (i = 0; i < length; i++) {
134                 if (!(i % 8))
135                         spu_write_wait();
136                 val = *froml;
137                 writel(val, to);
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         u32 regval;
148         spu_write_wait();
149         regval = readl(ARM_RESET_REGISTER);
150         regval |= 1;
151         spu_write_wait();
152         writel(regval, ARM_RESET_REGISTER);
153         for (i = 0; i < 64; i++) {
154                 spu_write_wait();
155                 regval = readl(SPU_REGISTER_BASE + (i * 0x80));
156                 regval = (regval & ~0x4000) | 0x8000;
157                 spu_write_wait();
158                 writel(regval, SPU_REGISTER_BASE + (i * 0x80));
159         }
160 }
161
162 /* spu_enable - set spu registers to enable sound output */
163 static void spu_enable(void)
164 {
165         u32 regval = readl(ARM_RESET_REGISTER);
166         regval &= ~1;
167         spu_write_wait();
168         writel(regval, ARM_RESET_REGISTER);
169 }
170
171 /* 
172  * Halt the sound processor, clear the memory,
173  * load some default ARM7 code, and then restart ARM7
174 */
175 static void spu_reset(void)
176 {
177         spu_disable();
178         spu_memset(0, 0, 0x200000 / 4);
179         /* Put ARM7 in endless loop */
180         ctrl_outl(0xea000002, SPU_MEMORY_BASE);
181         spu_enable();
182 }
183
184 /* aica_chn_start - write to spu to start playback */
185 static void aica_chn_start(void)
186 {
187         spu_write_wait();
188         writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
189 }
190
191 /* aica_chn_halt - write to spu to halt playback */
192 static void aica_chn_halt(void)
193 {
194         spu_write_wait();
195         writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
196 }
197
198 /* ALSA code below */
199 static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
200         .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
201         .formats =
202             (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
203              SNDRV_PCM_FMTBIT_IMA_ADPCM),
204         .rates = SNDRV_PCM_RATE_8000_48000,
205         .rate_min = 8000,
206         .rate_max = 48000,
207         .channels_min = 1,
208         .channels_max = 2,
209         .buffer_bytes_max = AICA_BUFFER_SIZE,
210         .period_bytes_min = AICA_PERIOD_SIZE,
211         .period_bytes_max = AICA_PERIOD_SIZE,
212         .periods_min = AICA_PERIOD_NUMBER,
213         .periods_max = AICA_PERIOD_NUMBER,
214 };
215
216 static int aica_dma_transfer(int channels, int buffer_size,
217                              struct snd_pcm_substream *substream)
218 {
219         int q, err, period_offset;
220         struct snd_card_aica *dreamcastcard;
221         struct snd_pcm_runtime *runtime;
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                 err = dma_xfer(AICA_DMA_CHANNEL,
229                                (unsigned long)(runtime->dma_area +
230                                                (AICA_BUFFER_SIZE * q) /
231                                                channels +
232                                                AICA_PERIOD_SIZE *
233                                                period_offset),
234                                AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
235                                AICA_PERIOD_SIZE * period_offset,
236                                buffer_size / channels, AICA_DMA_MODE);
237                 if (unlikely(err < 0))
238                         break;
239                 dma_wait_for_completion(AICA_DMA_CHANNEL);
240         }
241         return err;
242 }
243
244 static void startup_aica(struct snd_card_aica *dreamcastcard)
245 {
246         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
247                     dreamcastcard->channel,
248                     sizeof(struct aica_channel));
249         aica_chn_start();
250 }
251
252 static void run_spu_dma(struct work_struct *work)
253 {
254         int buffer_size;
255         struct snd_pcm_substream *substream;
256         struct snd_pcm_runtime *runtime;
257         struct snd_card_aica *dreamcastcard;
258         struct spu_work_holder *holder = container_of(work, struct spu_work_holder, spu_dma_work);
259         substream = holder-> sspointer;
260         dreamcastcard = substream->pcm->private_data;
261         runtime = substream->runtime;
262         if (unlikely(dreamcastcard->dma_check == 0)) {
263                 buffer_size = frames_to_bytes(runtime, runtime->buffer_size);
264                 if (runtime->channels > 1)
265                         dreamcastcard->channel->flags |= 0x01;
266                 aica_dma_transfer(runtime->channels, buffer_size, substream);
267                 startup_aica(dreamcastcard);
268                 dreamcastcard->clicks =
269                     buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
270                 return;
271         } else {
272                 aica_dma_transfer(runtime->channels,
273                                   AICA_PERIOD_SIZE * runtime->channels,
274                                   substream);
275                 snd_pcm_period_elapsed(dreamcastcard->substream);
276                 dreamcastcard->clicks++;
277                 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
278                 {
279                         dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
280                 }
281                 mod_timer(&dreamcastcard->timer, jiffies + 1);
282         }
283 }
284
285 static void aica_period_elapsed(unsigned long timer_var)
286 {
287         /*timer function - so cannot sleep */
288         int play_period;
289         struct snd_pcm_runtime *runtime;
290         struct snd_pcm_substream *substream;
291         struct snd_card_aica *dreamcastcard;
292         substream = (struct snd_pcm_substream *)timer_var;
293         runtime = substream->runtime;
294         dreamcastcard = substream->pcm->private_data;
295         /* Have we played out an additional period? */
296         play_period =
297             frames_to_bytes(runtime,
298                             readl
299                             (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
300             AICA_PERIOD_SIZE;
301         if (play_period == dreamcastcard->current_period) {
302                 /* reschedule the timer */
303                 mod_timer(&(dreamcastcard->timer), jiffies + 1);
304                 return;
305         }
306         if (runtime->channels > 1)
307                 dreamcastcard->current_period = play_period;
308         if (unlikely(dreamcastcard->dma_check == 0))
309                 dreamcastcard->dma_check = 1;
310                 queue_work(aica_queue, &(spu_working.spu_dma_work));
311 }
312
313 static void spu_begin_dma(struct snd_pcm_substream *substream)
314 {
315         /* Must be atomic */
316         struct snd_card_aica *dreamcastcard;
317         struct snd_pcm_runtime *runtime;
318         runtime = substream->runtime;
319         dreamcastcard = substream->pcm->private_data;
320         /*  Use queue to do the heavy lifting */
321         spu_working.sspointer = substream;
322         INIT_WORK(&(spu_working.spu_dma_work), run_spu_dma);
323         queue_work(aica_queue, &(spu_working.spu_dma_work));
324         /* Timer may already be running */
325         if (unlikely(dreamcastcard->timer.data)) {
326                 mod_timer(&dreamcastcard->timer, jiffies + 4);
327                 return;
328         }
329         init_timer(&(dreamcastcard->timer));
330         dreamcastcard->timer.data = (unsigned long)substream;
331         dreamcastcard->timer.function = aica_period_elapsed;
332         dreamcastcard->timer.expires = jiffies + 4;
333         add_timer(&(dreamcastcard->timer));
334 }
335
336 static int snd_aicapcm_pcm_open(struct snd_pcm_substream
337                                 *substream)
338 {
339         struct snd_pcm_runtime *runtime;
340         struct aica_channel *channel;
341         struct snd_card_aica *dreamcastcard;
342         if (!enable)
343                 return -ENOENT;
344         dreamcastcard = substream->pcm->private_data;
345         channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
346         if (!channel)
347                 return -ENOMEM;
348         /* set defaults for channel */
349         channel->sfmt = SM_8BIT;
350         channel->cmd = AICA_CMD_START;
351         channel->vol = dreamcastcard->master_volume;
352         channel->pan = 0x80;
353         channel->pos = 0;
354         channel->flags = 0;     /* default to mono */
355         dreamcastcard->channel = channel;
356         runtime = substream->runtime;
357         runtime->hw = snd_pcm_aica_playback_hw;
358         spu_enable();
359         dreamcastcard->clicks = 0;
360         dreamcastcard->current_period = 0;
361         dreamcastcard->dma_check = 0;
362         return 0;
363 }
364
365 static int snd_aicapcm_pcm_close(struct snd_pcm_substream
366                                  *substream)
367 {
368         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
369         del_timer(&dreamcastcard->timer);
370         kfree(dreamcastcard->channel);
371         spu_disable();
372         return 0;
373 }
374
375 static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
376                                    *substream)
377 {
378         /* Free the DMA buffer */
379         return snd_pcm_lib_free_pages(substream);
380 }
381
382 static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
383                                      *substream, struct snd_pcm_hw_params
384                                      *hw_params)
385 {
386         /* Allocate a DMA buffer using ALSA built-ins */
387         return
388             snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params));
389 }
390
391 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
392                                    *substream)
393 {
394         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
395         if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
396                 dreamcastcard->channel->sfmt = SM_16BIT;
397         dreamcastcard->channel->freq = substream->runtime->rate;
398         dreamcastcard->substream = substream;
399         return 0;
400 }
401
402 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
403                                    *substream, int cmd)
404 {
405         struct snd_card_aica *dreamcastcard;
406         switch (cmd) {
407         case SNDRV_PCM_TRIGGER_START:
408                 spu_begin_dma(substream);
409                 break;
410         case SNDRV_PCM_TRIGGER_STOP:
411                 dreamcastcard = substream->pcm->private_data;
412                 if (dreamcastcard->timer.data)
413                         del_timer(&dreamcastcard->timer);
414                 aica_chn_halt();
415                 break;
416         default:
417                 return -EINVAL;
418         }
419         return 0;
420 }
421
422 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
423                                              *substream)
424 {
425         return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
426 }
427
428 static struct snd_pcm_ops snd_aicapcm_playback_ops = {
429         .open = snd_aicapcm_pcm_open,
430         .close = snd_aicapcm_pcm_close,
431         .ioctl = snd_pcm_lib_ioctl,
432         .hw_params = snd_aicapcm_pcm_hw_params,
433         .hw_free = snd_aicapcm_pcm_hw_free,
434         .prepare = snd_aicapcm_pcm_prepare,
435         .trigger = snd_aicapcm_pcm_trigger,
436         .pointer = snd_aicapcm_pcm_pointer,
437 };
438
439 /* TO DO: set up to handle more than one pcm instance */
440 static int __init snd_aicapcmchip(struct snd_card_aica
441                                   *dreamcastcard, int pcm_index)
442 {
443         struct snd_pcm *pcm;
444         int err;
445         /* AICA has no capture ability */
446         err =
447             snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0, &pcm);
448         if (unlikely(err < 0))
449                 return err;
450         pcm->private_data = dreamcastcard;
451         strcpy(pcm->name, "AICA PCM");
452         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
453                         &snd_aicapcm_playback_ops);
454         /* Allocate the DMA buffers */
455         err =
456             snd_pcm_lib_preallocate_pages_for_all(pcm,
457                                                   SNDRV_DMA_TYPE_CONTINUOUS,
458                                                   snd_dma_continuous_data
459                                                   (GFP_KERNEL),
460                                                   AICA_BUFFER_SIZE,
461                                                   AICA_BUFFER_SIZE);
462         return err;
463 }
464
465 /* Mixer controls */
466 static int aica_pcmswitch_info(struct snd_kcontrol *kcontrol,
467                                struct snd_ctl_elem_info *uinfo)
468 {
469         uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
470         uinfo->count = 1;
471         uinfo->value.integer.min = 0;
472         uinfo->value.integer.max = 1;
473         return 0;
474 }
475
476 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
477                               struct snd_ctl_elem_value *ucontrol)
478 {
479         ucontrol->value.integer.value[0] = 1;   /* TO DO: Fix me */
480         return 0;
481 }
482
483 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
484                               struct snd_ctl_elem_value *ucontrol)
485 {
486         if (ucontrol->value.integer.value[0] == 1)
487                 return 0;       /* TO DO: Fix me */
488         else
489                 aica_chn_halt();
490         return 0;
491 }
492
493 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
494                                struct snd_ctl_elem_info *uinfo)
495 {
496         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
497         uinfo->count = 1;
498         uinfo->value.integer.min = 0;
499         uinfo->value.integer.max = 0xFF;
500         return 0;
501 }
502
503 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
504                               struct snd_ctl_elem_value *ucontrol)
505 {
506         struct snd_card_aica *dreamcastcard;
507         dreamcastcard = kcontrol->private_data;
508         if (unlikely(!dreamcastcard->channel))
509                 return -ETXTBSY;        /* we've not yet been set up */
510         ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
511         return 0;
512 }
513
514 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
515                               struct snd_ctl_elem_value *ucontrol)
516 {
517         struct snd_card_aica *dreamcastcard;
518         dreamcastcard = kcontrol->private_data;
519         if (unlikely(!dreamcastcard->channel))
520                 return -ETXTBSY;
521         if (unlikely(dreamcastcard->channel->vol ==
522                      ucontrol->value.integer.value[0]))
523                 return 0;
524         dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
525         dreamcastcard->master_volume = ucontrol->value.integer.value[0];
526         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
527                     dreamcastcard->channel,
528                     sizeof(struct aica_channel));
529
530         return 1;
531 }
532
533 static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
534         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
535         .name = "PCM Playback Switch",
536         .index = 0,
537         .info = aica_pcmswitch_info,
538         .get = aica_pcmswitch_get,
539         .put = aica_pcmswitch_put
540 };
541
542 static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
543         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
544         .name = "PCM Playback Volume",
545         .index = 0,
546         .info = aica_pcmvolume_info,
547         .get = aica_pcmvolume_get,
548         .put = aica_pcmvolume_put
549 };
550
551 static int load_aica_firmware(void)
552 {
553         int err;
554         const struct firmware *fw_entry;
555         spu_reset();
556         err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
557         if (unlikely(err))
558                 return err;
559         /* write firware into memory */
560         spu_disable();
561         spu_memload(0, fw_entry->data, fw_entry->size);
562         spu_enable();
563         release_firmware(fw_entry);
564         return err;
565 }
566
567 static int __devinit add_aicamixer_controls(struct snd_card_aica
568                                             *dreamcastcard)
569 {
570         int err;
571         err = snd_ctl_add
572             (dreamcastcard->card,
573              snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
574         if (unlikely(err < 0))
575                 return err;
576         err = snd_ctl_add
577             (dreamcastcard->card,
578              snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
579         if (unlikely(err < 0))
580                 return err;
581         return 0;
582 }
583
584 static int snd_aica_remove(struct platform_device *devptr)
585 {
586         struct snd_card_aica *dreamcastcard;
587         dreamcastcard = platform_get_drvdata(devptr);
588         if (unlikely(!dreamcastcard))
589                 return -ENODEV;
590         snd_card_free(dreamcastcard->card);
591         kfree(dreamcastcard);
592         platform_set_drvdata(devptr, NULL);
593         return 0;
594 }
595
596 static int __init snd_aica_probe(struct platform_device *devptr)
597 {
598         int err;
599         struct snd_card_aica *dreamcastcard;
600         dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
601         if (unlikely(!dreamcastcard))
602                 return -ENOMEM;
603         dreamcastcard->card =
604             snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
605         if (unlikely(!dreamcastcard->card)) {
606                 kfree(dreamcastcard);
607                 return -ENODEV;
608         }
609         strcpy(dreamcastcard->card->driver, "snd_aica");
610         strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
611         strcpy(dreamcastcard->card->longname,
612                "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
613         /* Load the PCM 'chip' */
614         err = snd_aicapcmchip(dreamcastcard, 0);
615         if (unlikely(err < 0))
616                 goto freedreamcast;
617         snd_card_set_dev(dreamcastcard->card, &devptr->dev);
618         dreamcastcard->timer.data = 0;
619         dreamcastcard->channel = NULL;
620         /* Add basic controls */
621         err = add_aicamixer_controls(dreamcastcard);
622         if (unlikely(err < 0))
623                 goto freedreamcast;
624         /* Register the card with ALSA subsystem */
625         err = snd_card_register(dreamcastcard->card);
626         if (unlikely(err < 0))
627                 goto freedreamcast;
628         platform_set_drvdata(devptr, dreamcastcard);
629         aica_queue = create_workqueue(CARD_NAME);
630         if (unlikely(!aica_queue))
631                 goto freedreamcast;
632         snd_printk
633             ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
634         return 0;
635       freedreamcast:
636         snd_card_free(dreamcastcard->card);
637         kfree(dreamcastcard);
638         return err;
639 }
640
641 static struct platform_driver snd_aica_driver = {
642         .probe = snd_aica_probe,
643         .remove = snd_aica_remove,
644         .driver = {
645                    .name = SND_AICA_DRIVER},
646 };
647
648 static 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 (unlikely(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
664 static void __exit aica_exit(void)
665 {
666         /* Destroy the aica kernel thread */
667         destroy_workqueue(aica_queue);
668         platform_device_unregister(pd);
669         platform_driver_unregister(&snd_aica_driver);
670         /* Kill any sound still playing and reset ARM7 to safe state */
671         spu_reset();
672 }
673
674 module_init(aica_init);
675 module_exit(aica_exit);