131ec4812288e6043a1cfb2fa8bad7001ae6585e
[linux-2.6.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 static struct workqueue_struct *aica_queue;
68
69 /* Simple platform device */
70 static struct platform_device *pd;
71 static 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 */
88 static 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 */
106 static void spu_memset(u32 toi, u32 what, int length)
107 {
108         int i;
109         snd_assert(length % 4 == 0, return);
110         for (i = 0; i < length; i++) {
111                 if (!(i % 8))
112                         spu_write_wait();
113                 writel(what, toi + SPU_MEMORY_BASE);
114                 toi++;
115         }
116 }
117
118 /* spu_memload - write to SPU address space */
119 static void spu_memload(u32 toi, void *from, int length)
120 {
121         u32 *froml = from;
122         u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
123         int i;
124         u32 val;
125         length = DIV_ROUND_UP(length, 4);
126         spu_write_wait();
127         for (i = 0; i < length; i++) {
128                 if (!(i % 8))
129                         spu_write_wait();
130                 val = *froml;
131                 writel(val, to);
132                 froml++;
133                 to++;
134         }
135 }
136
137 /* spu_disable - set spu registers to stop sound output */
138 static void spu_disable(void)
139 {
140         int i;
141         u32 regval;
142         spu_write_wait();
143         regval = readl(ARM_RESET_REGISTER);
144         regval |= 1;
145         spu_write_wait();
146         writel(regval, ARM_RESET_REGISTER);
147         for (i = 0; i < 64; i++) {
148                 spu_write_wait();
149                 regval = readl(SPU_REGISTER_BASE + (i * 0x80));
150                 regval = (regval & ~0x4000) | 0x8000;
151                 spu_write_wait();
152                 writel(regval, SPU_REGISTER_BASE + (i * 0x80));
153         }
154 }
155
156 /* spu_enable - set spu registers to enable sound output */
157 static void spu_enable(void)
158 {
159         u32 regval = readl(ARM_RESET_REGISTER);
160         regval &= ~1;
161         spu_write_wait();
162         writel(regval, ARM_RESET_REGISTER);
163 }
164
165 /* 
166  * Halt the sound processor, clear the memory,
167  * load some default ARM7 code, and then restart ARM7
168 */
169 static void spu_reset(void)
170 {
171         spu_disable();
172         spu_memset(0, 0, 0x200000 / 4);
173         /* Put ARM7 in endless loop */
174         ctrl_outl(0xea000002, SPU_MEMORY_BASE);
175         spu_enable();
176 }
177
178 /* aica_chn_start - write to spu to start playback */
179 static void aica_chn_start(void)
180 {
181         spu_write_wait();
182         writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
183 }
184
185 /* aica_chn_halt - write to spu to halt playback */
186 static void aica_chn_halt(void)
187 {
188         spu_write_wait();
189         writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
190 }
191
192 /* ALSA code below */
193 static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
194         .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
195         .formats =
196             (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
197              SNDRV_PCM_FMTBIT_IMA_ADPCM),
198         .rates = SNDRV_PCM_RATE_8000_48000,
199         .rate_min = 8000,
200         .rate_max = 48000,
201         .channels_min = 1,
202         .channels_max = 2,
203         .buffer_bytes_max = AICA_BUFFER_SIZE,
204         .period_bytes_min = AICA_PERIOD_SIZE,
205         .period_bytes_max = AICA_PERIOD_SIZE,
206         .periods_min = AICA_PERIOD_NUMBER,
207         .periods_max = AICA_PERIOD_NUMBER,
208 };
209
210 static int aica_dma_transfer(int channels, int buffer_size,
211                              struct snd_pcm_substream *substream)
212 {
213         int q, err, period_offset;
214         struct snd_card_aica *dreamcastcard;
215         struct snd_pcm_runtime *runtime;
216         err = 0;
217         dreamcastcard = substream->pcm->private_data;
218         period_offset = dreamcastcard->clicks;
219         period_offset %= (AICA_PERIOD_NUMBER / channels);
220         runtime = substream->runtime;
221         for (q = 0; q < channels; q++) {
222                 err = dma_xfer(AICA_DMA_CHANNEL,
223                                (unsigned long) (runtime->dma_area +
224                                                 (AICA_BUFFER_SIZE * q) /
225                                                 channels +
226                                                 AICA_PERIOD_SIZE *
227                                                 period_offset),
228                                AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
229                                AICA_PERIOD_SIZE * period_offset,
230                                buffer_size / channels, AICA_DMA_MODE);
231                 if (unlikely(err < 0))
232                         break;
233                 dma_wait_for_completion(AICA_DMA_CHANNEL);
234         }
235         return err;
236 }
237
238 static void startup_aica(struct snd_card_aica *dreamcastcard)
239 {
240         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
241                     dreamcastcard->channel, sizeof(struct aica_channel));
242         aica_chn_start();
243 }
244
245 static void run_spu_dma(struct work_struct *work)
246 {
247         int buffer_size;
248         struct snd_pcm_runtime *runtime;
249         struct snd_card_aica *dreamcastcard;
250         dreamcastcard =
251             container_of(work, struct snd_card_aica, spu_dma_work);
252         runtime = dreamcastcard->substream->runtime;
253         if (unlikely(dreamcastcard->dma_check == 0)) {
254                 buffer_size =
255                     frames_to_bytes(runtime, runtime->buffer_size);
256                 if (runtime->channels > 1)
257                         dreamcastcard->channel->flags |= 0x01;
258                 aica_dma_transfer(runtime->channels, buffer_size,
259                                   dreamcastcard->substream);
260                 startup_aica(dreamcastcard);
261                 dreamcastcard->clicks =
262                     buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
263                 return;
264         } else {
265                 aica_dma_transfer(runtime->channels,
266                                   AICA_PERIOD_SIZE * runtime->channels,
267                                   dreamcastcard->substream);
268                 snd_pcm_period_elapsed(dreamcastcard->substream);
269                 dreamcastcard->clicks++;
270                 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
271                         dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
272                 mod_timer(&dreamcastcard->timer, jiffies + 1);
273         }
274 }
275
276 static void aica_period_elapsed(unsigned long timer_var)
277 {
278         /*timer function - so cannot sleep */
279         int play_period;
280         struct snd_pcm_runtime *runtime;
281         struct snd_pcm_substream *substream;
282         struct snd_card_aica *dreamcastcard;
283         substream = (struct snd_pcm_substream *) timer_var;
284         runtime = substream->runtime;
285         dreamcastcard = substream->pcm->private_data;
286         /* Have we played out an additional period? */
287         play_period =
288             frames_to_bytes(runtime,
289                             readl
290                             (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
291             AICA_PERIOD_SIZE;
292         if (play_period == dreamcastcard->current_period) {
293                 /* reschedule the timer */
294                 mod_timer(&(dreamcastcard->timer), jiffies + 1);
295                 return;
296         }
297         if (runtime->channels > 1)
298                 dreamcastcard->current_period = play_period;
299         if (unlikely(dreamcastcard->dma_check == 0))
300                 dreamcastcard->dma_check = 1;
301         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
302 }
303
304 static void spu_begin_dma(struct snd_pcm_substream *substream)
305 {
306         struct snd_card_aica *dreamcastcard;
307         struct snd_pcm_runtime *runtime;
308         runtime = substream->runtime;
309         dreamcastcard = substream->pcm->private_data;
310         /*get the queue to do the work */
311         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
312         /* Timer may already be running */
313         if (unlikely(dreamcastcard->timer.data)) {
314                 mod_timer(&dreamcastcard->timer, jiffies + 4);
315                 return;
316         }
317         init_timer(&(dreamcastcard->timer));
318         dreamcastcard->timer.data = (unsigned long) substream;
319         dreamcastcard->timer.function = aica_period_elapsed;
320         dreamcastcard->timer.expires = jiffies + 4;
321         add_timer(&(dreamcastcard->timer));
322 }
323
324 static int snd_aicapcm_pcm_open(struct snd_pcm_substream
325                                 *substream)
326 {
327         struct snd_pcm_runtime *runtime;
328         struct aica_channel *channel;
329         struct snd_card_aica *dreamcastcard;
330         if (!enable)
331                 return -ENOENT;
332         dreamcastcard = substream->pcm->private_data;
333         channel = kmalloc(sizeof(struct aica_channel), GFP_KERNEL);
334         if (!channel)
335                 return -ENOMEM;
336         /* set defaults for channel */
337         channel->sfmt = SM_8BIT;
338         channel->cmd = AICA_CMD_START;
339         channel->vol = dreamcastcard->master_volume;
340         channel->pan = 0x80;
341         channel->pos = 0;
342         channel->flags = 0;     /* default to mono */
343         dreamcastcard->channel = channel;
344         runtime = substream->runtime;
345         runtime->hw = snd_pcm_aica_playback_hw;
346         spu_enable();
347         dreamcastcard->clicks = 0;
348         dreamcastcard->current_period = 0;
349         dreamcastcard->dma_check = 0;
350         return 0;
351 }
352
353 static int snd_aicapcm_pcm_close(struct snd_pcm_substream
354                                  *substream)
355 {
356         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
357         flush_workqueue(aica_queue);
358         if (dreamcastcard->timer.data)
359                 del_timer(&dreamcastcard->timer);
360         kfree(dreamcastcard->channel);
361         spu_disable();
362         return 0;
363 }
364
365 static int snd_aicapcm_pcm_hw_free(struct snd_pcm_substream
366                                    *substream)
367 {
368         /* Free the DMA buffer */
369         return snd_pcm_lib_free_pages(substream);
370 }
371
372 static int snd_aicapcm_pcm_hw_params(struct snd_pcm_substream
373                                      *substream, struct snd_pcm_hw_params
374                                      *hw_params)
375 {
376         /* Allocate a DMA buffer using ALSA built-ins */
377         return
378             snd_pcm_lib_malloc_pages(substream,
379                                      params_buffer_bytes(hw_params));
380 }
381
382 static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
383                                    *substream)
384 {
385         struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
386         if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
387                 dreamcastcard->channel->sfmt = SM_16BIT;
388         dreamcastcard->channel->freq = substream->runtime->rate;
389         dreamcastcard->substream = substream;
390         return 0;
391 }
392
393 static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
394                                    *substream, int cmd)
395 {
396         switch (cmd) {
397         case SNDRV_PCM_TRIGGER_START:
398                 spu_begin_dma(substream);
399                 break;
400         case SNDRV_PCM_TRIGGER_STOP:
401                 aica_chn_halt();
402                 break;
403         default:
404                 return -EINVAL;
405         }
406         return 0;
407 }
408
409 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
410                                              *substream)
411 {
412         return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
413 }
414
415 static struct snd_pcm_ops snd_aicapcm_playback_ops = {
416         .open = snd_aicapcm_pcm_open,
417         .close = snd_aicapcm_pcm_close,
418         .ioctl = snd_pcm_lib_ioctl,
419         .hw_params = snd_aicapcm_pcm_hw_params,
420         .hw_free = snd_aicapcm_pcm_hw_free,
421         .prepare = snd_aicapcm_pcm_prepare,
422         .trigger = snd_aicapcm_pcm_trigger,
423         .pointer = snd_aicapcm_pcm_pointer,
424 };
425
426 /* TO DO: set up to handle more than one pcm instance */
427 static int __init snd_aicapcmchip(struct snd_card_aica
428                                   *dreamcastcard, int pcm_index)
429 {
430         struct snd_pcm *pcm;
431         int err;
432         /* AICA has no capture ability */
433         err =
434             snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
435                         &pcm);
436         if (unlikely(err < 0))
437                 return err;
438         pcm->private_data = dreamcastcard;
439         strcpy(pcm->name, "AICA PCM");
440         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
441                         &snd_aicapcm_playback_ops);
442         /* Allocate the DMA buffers */
443         err =
444             snd_pcm_lib_preallocate_pages_for_all(pcm,
445                                                   SNDRV_DMA_TYPE_CONTINUOUS,
446                                                   snd_dma_continuous_data
447                                                   (GFP_KERNEL),
448                                                   AICA_BUFFER_SIZE,
449                                                   AICA_BUFFER_SIZE);
450         return err;
451 }
452
453 /* Mixer controls */
454 #define aica_pcmswitch_info             snd_ctl_boolean_mono_info
455
456 static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
457                               struct snd_ctl_elem_value *ucontrol)
458 {
459         ucontrol->value.integer.value[0] = 1;   /* TO DO: Fix me */
460         return 0;
461 }
462
463 static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
464                               struct snd_ctl_elem_value *ucontrol)
465 {
466         if (ucontrol->value.integer.value[0] == 1)
467                 return 0;       /* TO DO: Fix me */
468         else
469                 aica_chn_halt();
470         return 0;
471 }
472
473 static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
474                                struct snd_ctl_elem_info *uinfo)
475 {
476         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
477         uinfo->count = 1;
478         uinfo->value.integer.min = 0;
479         uinfo->value.integer.max = 0xFF;
480         return 0;
481 }
482
483 static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
484                               struct snd_ctl_elem_value *ucontrol)
485 {
486         struct snd_card_aica *dreamcastcard;
487         dreamcastcard = kcontrol->private_data;
488         if (unlikely(!dreamcastcard->channel))
489                 return -ETXTBSY;        /* we've not yet been set up */
490         ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
491         return 0;
492 }
493
494 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
495                               struct snd_ctl_elem_value *ucontrol)
496 {
497         struct snd_card_aica *dreamcastcard;
498         dreamcastcard = kcontrol->private_data;
499         if (unlikely(!dreamcastcard->channel))
500                 return -ETXTBSY;
501         if (unlikely(dreamcastcard->channel->vol ==
502                      ucontrol->value.integer.value[0]))
503                 return 0;
504         dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
505         dreamcastcard->master_volume = ucontrol->value.integer.value[0];
506         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
507                     dreamcastcard->channel, sizeof(struct aica_channel));
508         return 1;
509 }
510
511 static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
512         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
513         .name = "PCM Playback Switch",
514         .index = 0,
515         .info = aica_pcmswitch_info,
516         .get = aica_pcmswitch_get,
517         .put = aica_pcmswitch_put
518 };
519
520 static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
521         .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
522         .name = "PCM Playback Volume",
523         .index = 0,
524         .info = aica_pcmvolume_info,
525         .get = aica_pcmvolume_get,
526         .put = aica_pcmvolume_put
527 };
528
529 static int load_aica_firmware(void)
530 {
531         int err;
532         const struct firmware *fw_entry;
533         spu_reset();
534         err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
535         if (unlikely(err))
536                 return err;
537         /* write firware into memory */
538         spu_disable();
539         spu_memload(0, fw_entry->data, fw_entry->size);
540         spu_enable();
541         release_firmware(fw_entry);
542         return err;
543 }
544
545 static int __devinit add_aicamixer_controls(struct snd_card_aica
546                                             *dreamcastcard)
547 {
548         int err;
549         err = snd_ctl_add
550             (dreamcastcard->card,
551              snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
552         if (unlikely(err < 0))
553                 return err;
554         err = snd_ctl_add
555             (dreamcastcard->card,
556              snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
557         if (unlikely(err < 0))
558                 return err;
559         return 0;
560 }
561
562 static int snd_aica_remove(struct platform_device *devptr)
563 {
564         struct snd_card_aica *dreamcastcard;
565         dreamcastcard = platform_get_drvdata(devptr);
566         if (unlikely(!dreamcastcard))
567                 return -ENODEV;
568         snd_card_free(dreamcastcard->card);
569         kfree(dreamcastcard);
570         platform_set_drvdata(devptr, NULL);
571         return 0;
572 }
573
574 static int __init snd_aica_probe(struct platform_device *devptr)
575 {
576         int err;
577         struct snd_card_aica *dreamcastcard;
578         dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
579         if (unlikely(!dreamcastcard))
580                 return -ENOMEM;
581         dreamcastcard->card =
582             snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
583         if (unlikely(!dreamcastcard->card)) {
584                 kfree(dreamcastcard);
585                 return -ENODEV;
586         }
587         strcpy(dreamcastcard->card->driver, "snd_aica");
588         strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
589         strcpy(dreamcastcard->card->longname,
590                "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
591         /* Prepare to use the queue */
592         INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
593         /* Load the PCM 'chip' */
594         err = snd_aicapcmchip(dreamcastcard, 0);
595         if (unlikely(err < 0))
596                 goto freedreamcast;
597         snd_card_set_dev(dreamcastcard->card, &devptr->dev);
598         dreamcastcard->timer.data = 0;
599         dreamcastcard->channel = NULL;
600         /* Add basic controls */
601         err = add_aicamixer_controls(dreamcastcard);
602         if (unlikely(err < 0))
603                 goto freedreamcast;
604         /* Register the card with ALSA subsystem */
605         err = snd_card_register(dreamcastcard->card);
606         if (unlikely(err < 0))
607                 goto freedreamcast;
608         platform_set_drvdata(devptr, dreamcastcard);
609         aica_queue = create_workqueue(CARD_NAME);
610         if (unlikely(!aica_queue))
611                 goto freedreamcast;
612         snd_printk
613             ("ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
614         return 0;
615       freedreamcast:
616         snd_card_free(dreamcastcard->card);
617         kfree(dreamcastcard);
618         return err;
619 }
620
621 static struct platform_driver snd_aica_driver = {
622         .probe = snd_aica_probe,
623         .remove = snd_aica_remove,
624         .driver = {
625                    .name = SND_AICA_DRIVER},
626 };
627
628 static int __init aica_init(void)
629 {
630         int err;
631         err = platform_driver_register(&snd_aica_driver);
632         if (unlikely(err < 0))
633                 return err;
634         pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
635                                              aica_memory_space, 2);
636         if (unlikely(IS_ERR(pd))) {
637                 platform_driver_unregister(&snd_aica_driver);
638                 return PTR_ERR(pd);
639         }
640         /* Load the firmware */
641         return load_aica_firmware();
642 }
643
644 static void __exit aica_exit(void)
645 {
646         /* Destroy the aica kernel thread            *
647          * being extra cautious to check if it exists*/
648         if (likely(aica_queue))
649                 destroy_workqueue(aica_queue);
650         platform_device_unregister(pd);
651         platform_driver_unregister(&snd_aica_driver);
652         /* Kill any sound still playing and reset ARM7 to safe state */
653         spu_reset();
654 }
655
656 module_init(aica_init);
657 module_exit(aica_exit);