88dc840152ce9369f57956c2d43cde2ac0e936ab
[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         unsigned long flags;
110         snd_assert(length % 4 == 0, return);
111         for (i = 0; i < length; i++) {
112                 if (!(i % 8))
113                         spu_write_wait();
114                 local_irq_save(flags);
115                 writel(what, toi + SPU_MEMORY_BASE);
116                 local_irq_restore(flags);
117                 toi++;
118         }
119 }
120
121 /* spu_memload - write to SPU address space */
122 static void spu_memload(u32 toi, void *from, int length)
123 {
124         unsigned long flags;
125         u32 *froml = from;
126         u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
127         int i;
128         u32 val;
129         length = DIV_ROUND_UP(length, 4);
130         spu_write_wait();
131         for (i = 0; i < length; i++) {
132                 if (!(i % 8))
133                         spu_write_wait();
134                 val = *froml;
135                 local_irq_save(flags);
136                 writel(val, to);
137                 local_irq_restore(flags);
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         unsigned long flags;
148         u32 regval;
149         spu_write_wait();
150         regval = readl(ARM_RESET_REGISTER);
151         regval |= 1;
152         spu_write_wait();
153         local_irq_save(flags);
154         writel(regval, ARM_RESET_REGISTER);
155         local_irq_restore(flags);
156         for (i = 0; i < 64; i++) {
157                 spu_write_wait();
158                 regval = readl(SPU_REGISTER_BASE + (i * 0x80));
159                 regval = (regval & ~0x4000) | 0x8000;
160                 spu_write_wait();
161                 local_irq_save(flags);
162                 writel(regval, SPU_REGISTER_BASE + (i * 0x80));
163                 local_irq_restore(flags);
164         }
165 }
166
167 /* spu_enable - set spu registers to enable sound output */
168 static void spu_enable(void)
169 {
170         unsigned long flags;
171         u32 regval = readl(ARM_RESET_REGISTER);
172         regval &= ~1;
173         spu_write_wait();
174         local_irq_save(flags);
175         writel(regval, ARM_RESET_REGISTER);
176         local_irq_restore(flags);
177 }
178
179 /* 
180  * Halt the sound processor, clear the memory,
181  * load some default ARM7 code, and then restart ARM7
182 */
183 static void spu_reset(void)
184 {
185         unsigned long flags;
186         spu_disable();
187         spu_memset(0, 0, 0x200000 / 4);
188         /* Put ARM7 in endless loop */
189         local_irq_save(flags);
190         ctrl_outl(0xea000002, SPU_MEMORY_BASE);
191         local_irq_restore(flags);
192         spu_enable();
193 }
194
195 /* aica_chn_start - write to spu to start playback */
196 static void aica_chn_start(void)
197 {
198         unsigned long flags;
199         spu_write_wait();
200         local_irq_save(flags);
201         writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
202         local_irq_restore(flags);
203 }
204
205 /* aica_chn_halt - write to spu to halt playback */
206 static void aica_chn_halt(void)
207 {
208         unsigned long flags;
209         spu_write_wait();
210         local_irq_save(flags);
211         writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
212         local_irq_restore(flags);
213 }
214
215 /* ALSA code below */
216 static struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
217         .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
218         .formats =
219             (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
220              SNDRV_PCM_FMTBIT_IMA_ADPCM),
221         .rates = SNDRV_PCM_RATE_8000_48000,
222         .rate_min = 8000,
223         .rate_max = 48000,
224         .channels_min = 1,
225         .channels_max = 2,
226         .buffer_bytes_max = AICA_BUFFER_SIZE,
227         .period_bytes_min = AICA_PERIOD_SIZE,
228         .period_bytes_max = AICA_PERIOD_SIZE,
229         .periods_min = AICA_PERIOD_NUMBER,
230         .periods_max = AICA_PERIOD_NUMBER,
231 };
232
233 static int aica_dma_transfer(int channels, int buffer_size,
234                              struct snd_pcm_substream *substream)
235 {
236         int q, err, period_offset;
237         struct snd_card_aica *dreamcastcard;
238         struct snd_pcm_runtime *runtime;
239         unsigned long flags;
240         dreamcastcard = substream->pcm->private_data;
241         period_offset = dreamcastcard->clicks;
242         period_offset %= (AICA_PERIOD_NUMBER / channels);
243         runtime = substream->runtime;
244         for (q = 0; q < channels; q++) {
245                 local_irq_save(flags);
246                 err = dma_xfer(AICA_DMA_CHANNEL,
247                                (unsigned long) (runtime->dma_area +
248                                                 (AICA_BUFFER_SIZE * q) /
249                                                 channels +
250                                                 AICA_PERIOD_SIZE *
251                                                 period_offset),
252                                AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
253                                AICA_PERIOD_SIZE * period_offset,
254                                buffer_size / channels, AICA_DMA_MODE);
255                 if (unlikely(err < 0)) {
256                         local_irq_restore(flags);
257                         break;
258                 }
259                 dma_wait_for_completion(AICA_DMA_CHANNEL);
260                 local_irq_restore(flags);
261         }
262         return err;
263 }
264
265 static void startup_aica(struct snd_card_aica *dreamcastcard)
266 {
267         spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
268                     dreamcastcard->channel, sizeof(struct aica_channel));
269         aica_chn_start();
270 }
271
272 static void run_spu_dma(struct work_struct *work)
273 {
274         int buffer_size;
275         struct snd_pcm_runtime *runtime;
276         struct snd_card_aica *dreamcastcard;
277         dreamcastcard =
278             container_of(work, struct snd_card_aica, spu_dma_work);
279         runtime = dreamcastcard->substream->runtime;
280         if (unlikely(dreamcastcard->dma_check == 0)) {
281                 buffer_size =
282                     frames_to_bytes(runtime, runtime->buffer_size);
283                 if (runtime->channels > 1)
284                         dreamcastcard->channel->flags |= 0x01;
285                 aica_dma_transfer(runtime->channels, buffer_size,
286                                   dreamcastcard->substream);
287                 startup_aica(dreamcastcard);
288                 dreamcastcard->clicks =
289                     buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
290                 return;
291         } else {
292                 aica_dma_transfer(runtime->channels,
293                                   AICA_PERIOD_SIZE * runtime->channels,
294                                   dreamcastcard->substream);
295                 snd_pcm_period_elapsed(dreamcastcard->substream);
296                 dreamcastcard->clicks++;
297                 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
298                         dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
299                 mod_timer(&dreamcastcard->timer, jiffies + 1);
300         }
301 }
302
303 static void aica_period_elapsed(unsigned long timer_var)
304 {
305         /*timer function - so cannot sleep */
306         int play_period;
307         struct snd_pcm_runtime *runtime;
308         struct snd_pcm_substream *substream;
309         struct snd_card_aica *dreamcastcard;
310         substream = (struct snd_pcm_substream *) timer_var;
311         runtime = substream->runtime;
312         dreamcastcard = substream->pcm->private_data;
313         /* Have we played out an additional period? */
314         play_period =
315             frames_to_bytes(runtime,
316                             readl
317                             (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
318             AICA_PERIOD_SIZE;
319         if (play_period == dreamcastcard->current_period) {
320                 /* reschedule the timer */
321                 mod_timer(&(dreamcastcard->timer), jiffies + 1);
322                 return;
323         }
324         if (runtime->channels > 1)
325                 dreamcastcard->current_period = play_period;
326         if (unlikely(dreamcastcard->dma_check == 0))
327                 dreamcastcard->dma_check = 1;
328         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
329 }
330
331 static void spu_begin_dma(struct snd_pcm_substream *substream)
332 {
333         struct snd_card_aica *dreamcastcard;
334         struct snd_pcm_runtime *runtime;
335         runtime = substream->runtime;
336         dreamcastcard = substream->pcm->private_data;
337         /*get the queue to do the work */
338         queue_work(aica_queue, &(dreamcastcard->spu_dma_work));
339         /* Timer may already be running */
340         if (unlikely(dreamcastcard->timer.data)) {
341                 mod_timer(&dreamcastcard->timer, jiffies + 4);
342                 return;
343         }
344         init_timer(&(dreamcastcard->timer));
345         dreamcastcard->timer.data = (unsigned long) substream;
346         dreamcastcard->timer.function = aica_period_elapsed;
347         dreamcastcard->timer.expires = jiffies + 4;
348         add_timer(&(dreamcastcard->timer));
349 }
350
351 static 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
380 static 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
392 static 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
399 static 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
409 static 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
420 static 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
436 static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
437                                              *substream)
438 {
439         return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
440 }
441
442 static 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 */
454 static 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
483 static 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
490 static 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
500 static 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
510 static 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
521 static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
522                               struct snd_ctl_elem_value *ucontrol)
523 {
524         struct snd_card_aica *dreamcastcard;
525         dreamcastcard = kcontrol->private_data;
526         if (unlikely(!dreamcastcard->channel))
527                 return -ETXTBSY;
528         if (unlikely(dreamcastcard->channel->vol ==
529                      ucontrol->value.integer.value[0]))
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
538 static struct snd_kcontrol_new snd_aica_pcmswitch_control __devinitdata = {
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
547 static struct snd_kcontrol_new snd_aica_pcmvolume_control __devinitdata = {
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
556 static 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 firware 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
572 static int __devinit add_aicamixer_controls(struct snd_card_aica
573                                             *dreamcastcard)
574 {
575         int err;
576         err = snd_ctl_add
577             (dreamcastcard->card,
578              snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
579         if (unlikely(err < 0))
580                 return err;
581         err = snd_ctl_add
582             (dreamcastcard->card,
583              snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
584         if (unlikely(err < 0))
585                 return err;
586         return 0;
587 }
588
589 static int snd_aica_remove(struct platform_device *devptr)
590 {
591         struct snd_card_aica *dreamcastcard;
592         dreamcastcard = platform_get_drvdata(devptr);
593         if (unlikely(!dreamcastcard))
594                 return -ENODEV;
595         snd_card_free(dreamcastcard->card);
596         kfree(dreamcastcard);
597         platform_set_drvdata(devptr, NULL);
598         return 0;
599 }
600
601 static int __init snd_aica_probe(struct platform_device *devptr)
602 {
603         int err;
604         struct snd_card_aica *dreamcastcard;
605         dreamcastcard = kmalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
606         if (unlikely(!dreamcastcard))
607                 return -ENOMEM;
608         dreamcastcard->card =
609             snd_card_new(index, SND_AICA_DRIVER, THIS_MODULE, 0);
610         if (unlikely(!dreamcastcard->card)) {
611                 kfree(dreamcastcard);
612                 return -ENODEV;
613         }
614         strcpy(dreamcastcard->card->driver, "snd_aica");
615         strcpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
616         strcpy(dreamcastcard->card->longname,
617                "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
618         /* Prepare to use the queue */
619         INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
620         /* Load the PCM 'chip' */
621         err = snd_aicapcmchip(dreamcastcard, 0);
622         if (unlikely(err < 0))
623                 goto freedreamcast;
624         snd_card_set_dev(dreamcastcard->card, &devptr->dev);
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
648 static 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 static int __init aica_init(void)
656 {
657         int err;
658         err = platform_driver_register(&snd_aica_driver);
659         if (unlikely(err < 0))
660                 return err;
661         pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
662                                              aica_memory_space, 2);
663         if (unlikely(IS_ERR(pd))) {
664                 platform_driver_unregister(&snd_aica_driver);
665                 return PTR_ERR(pd);
666         }
667         /* Load the firmware */
668         return load_aica_firmware();
669 }
670
671 static void __exit aica_exit(void)
672 {
673         /* Destroy the aica kernel thread            *
674          * being extra cautious to check if it exists*/
675         if (likely(aica_queue))
676                 destroy_workqueue(aica_queue);
677         platform_device_unregister(pd);
678         platform_driver_unregister(&snd_aica_driver);
679         /* Kill any sound still playing and reset ARM7 to safe state */
680         spu_reset();
681 }
682
683 module_init(aica_init);
684 module_exit(aica_exit);