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11#include <linux/init.h>
12#include <linux/jiffies.h>
13#include <linux/slab.h>
14#include <linux/time.h>
15#include <linux/wait.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/firmware.h>
19#include <linux/timer.h>
20#include <linux/delay.h>
21#include <linux/workqueue.h>
22#include <linux/io.h>
23#include <sound/core.h>
24#include <sound/control.h>
25#include <sound/pcm.h>
26#include <sound/initval.h>
27#include <sound/info.h>
28#include <asm/dma.h>
29#include <mach/sysasic.h>
30#include "aica.h"
31
32MODULE_AUTHOR("Adrian McMenamin <adrian@mcmen.demon.co.uk>");
33MODULE_DESCRIPTION("Dreamcast AICA sound (pcm) driver");
34MODULE_LICENSE("GPL");
35MODULE_FIRMWARE("aica_firmware.bin");
36
37
38#define CARD_NAME "AICA"
39static int index = -1;
40static char *id;
41static bool enable = 1;
42module_param(index, int, 0444);
43MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
44module_param(id, charp, 0444);
45MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
46module_param(enable, bool, 0644);
47MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");
48
49
50static struct platform_device *pd;
51static struct resource aica_memory_space[2] = {
52 {
53 .name = "AICA ARM CONTROL",
54 .start = ARM_RESET_REGISTER,
55 .flags = IORESOURCE_MEM,
56 .end = ARM_RESET_REGISTER + 3,
57 },
58 {
59 .name = "AICA Sound RAM",
60 .start = SPU_MEMORY_BASE,
61 .flags = IORESOURCE_MEM,
62 .end = SPU_MEMORY_BASE + 0x200000 - 1,
63 },
64};
65
66
67
68static void spu_write_wait(void)
69{
70 int time_count;
71 time_count = 0;
72 while (1) {
73 if (!(readl(G2_FIFO) & 0x11))
74 break;
75
76 time_count++;
77 if (time_count > 0x10000) {
78 pr_warn("WARNING: G2 FIFO appears to be blocked.\n");
79 break;
80 }
81 }
82}
83
84
85static void spu_memset(u32 toi, u32 what, int length)
86{
87 int i;
88 unsigned long flags;
89 if (snd_BUG_ON(length % 4))
90 return;
91 for (i = 0; i < length; i++) {
92 if (!(i % 8))
93 spu_write_wait();
94 local_irq_save(flags);
95 writel(what, toi + SPU_MEMORY_BASE);
96 local_irq_restore(flags);
97 toi++;
98 }
99}
100
101
102static void spu_memload(u32 toi, const void *from, int length)
103{
104 unsigned long flags;
105 const u32 *froml = from;
106 u32 __iomem *to = (u32 __iomem *) (SPU_MEMORY_BASE + toi);
107 int i;
108 u32 val;
109 length = DIV_ROUND_UP(length, 4);
110 spu_write_wait();
111 for (i = 0; i < length; i++) {
112 if (!(i % 8))
113 spu_write_wait();
114 val = *froml;
115 local_irq_save(flags);
116 writel(val, to);
117 local_irq_restore(flags);
118 froml++;
119 to++;
120 }
121}
122
123
124static void spu_disable(void)
125{
126 int i;
127 unsigned long flags;
128 u32 regval;
129 spu_write_wait();
130 regval = readl(ARM_RESET_REGISTER);
131 regval |= 1;
132 spu_write_wait();
133 local_irq_save(flags);
134 writel(regval, ARM_RESET_REGISTER);
135 local_irq_restore(flags);
136 for (i = 0; i < 64; i++) {
137 spu_write_wait();
138 regval = readl(SPU_REGISTER_BASE + (i * 0x80));
139 regval = (regval & ~0x4000) | 0x8000;
140 spu_write_wait();
141 local_irq_save(flags);
142 writel(regval, SPU_REGISTER_BASE + (i * 0x80));
143 local_irq_restore(flags);
144 }
145}
146
147
148static void spu_enable(void)
149{
150 unsigned long flags;
151 u32 regval = readl(ARM_RESET_REGISTER);
152 regval &= ~1;
153 spu_write_wait();
154 local_irq_save(flags);
155 writel(regval, ARM_RESET_REGISTER);
156 local_irq_restore(flags);
157}
158
159
160
161
162
163static void spu_reset(void)
164{
165 unsigned long flags;
166 spu_disable();
167 spu_memset(0, 0, 0x200000 / 4);
168
169 local_irq_save(flags);
170 __raw_writel(0xea000002, SPU_MEMORY_BASE);
171 local_irq_restore(flags);
172 spu_enable();
173}
174
175
176static void aica_chn_start(void)
177{
178 unsigned long flags;
179 spu_write_wait();
180 local_irq_save(flags);
181 writel(AICA_CMD_KICK | AICA_CMD_START, (u32 *) AICA_CONTROL_POINT);
182 local_irq_restore(flags);
183}
184
185
186static void aica_chn_halt(void)
187{
188 unsigned long flags;
189 spu_write_wait();
190 local_irq_save(flags);
191 writel(AICA_CMD_KICK | AICA_CMD_STOP, (u32 *) AICA_CONTROL_POINT);
192 local_irq_restore(flags);
193}
194
195
196static const struct snd_pcm_hardware snd_pcm_aica_playback_hw = {
197 .info = (SNDRV_PCM_INFO_NONINTERLEAVED),
198 .formats =
199 (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE |
200 SNDRV_PCM_FMTBIT_IMA_ADPCM),
201 .rates = SNDRV_PCM_RATE_8000_48000,
202 .rate_min = 8000,
203 .rate_max = 48000,
204 .channels_min = 1,
205 .channels_max = 2,
206 .buffer_bytes_max = AICA_BUFFER_SIZE,
207 .period_bytes_min = AICA_PERIOD_SIZE,
208 .period_bytes_max = AICA_PERIOD_SIZE,
209 .periods_min = AICA_PERIOD_NUMBER,
210 .periods_max = AICA_PERIOD_NUMBER,
211};
212
213static int aica_dma_transfer(int channels, int buffer_size,
214 struct snd_pcm_substream *substream)
215{
216 int q, err, period_offset;
217 struct snd_card_aica *dreamcastcard;
218 struct snd_pcm_runtime *runtime;
219 unsigned long flags;
220 err = 0;
221 dreamcastcard = substream->pcm->private_data;
222 period_offset = dreamcastcard->clicks;
223 period_offset %= (AICA_PERIOD_NUMBER / channels);
224 runtime = substream->runtime;
225 for (q = 0; q < channels; q++) {
226 local_irq_save(flags);
227 err = dma_xfer(AICA_DMA_CHANNEL,
228 (unsigned long) (runtime->dma_area +
229 (AICA_BUFFER_SIZE * q) /
230 channels +
231 AICA_PERIOD_SIZE *
232 period_offset),
233 AICA_CHANNEL0_OFFSET + q * CHANNEL_OFFSET +
234 AICA_PERIOD_SIZE * period_offset,
235 buffer_size / channels, AICA_DMA_MODE);
236 if (unlikely(err < 0)) {
237 local_irq_restore(flags);
238 break;
239 }
240 dma_wait_for_completion(AICA_DMA_CHANNEL);
241 local_irq_restore(flags);
242 }
243 return err;
244}
245
246static void startup_aica(struct snd_card_aica *dreamcastcard)
247{
248 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
249 dreamcastcard->channel, sizeof(struct aica_channel));
250 aica_chn_start();
251}
252
253static void run_spu_dma(struct work_struct *work)
254{
255 int buffer_size;
256 struct snd_pcm_runtime *runtime;
257 struct snd_card_aica *dreamcastcard;
258 dreamcastcard =
259 container_of(work, struct snd_card_aica, spu_dma_work);
260 runtime = dreamcastcard->substream->runtime;
261 if (unlikely(dreamcastcard->dma_check == 0)) {
262 buffer_size =
263 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,
267 dreamcastcard->substream);
268 startup_aica(dreamcastcard);
269 dreamcastcard->clicks =
270 buffer_size / (AICA_PERIOD_SIZE * runtime->channels);
271 return;
272 } else {
273 aica_dma_transfer(runtime->channels,
274 AICA_PERIOD_SIZE * runtime->channels,
275 dreamcastcard->substream);
276 snd_pcm_period_elapsed(dreamcastcard->substream);
277 dreamcastcard->clicks++;
278 if (unlikely(dreamcastcard->clicks >= AICA_PERIOD_NUMBER))
279 dreamcastcard->clicks %= AICA_PERIOD_NUMBER;
280 if (snd_pcm_running(dreamcastcard->substream))
281 mod_timer(&dreamcastcard->timer, jiffies + 1);
282 }
283}
284
285static void aica_period_elapsed(struct timer_list *t)
286{
287 struct snd_card_aica *dreamcastcard = timer_container_of(dreamcastcard,
288 t, timer);
289 struct snd_pcm_substream *substream = dreamcastcard->substream;
290
291 int play_period;
292 struct snd_pcm_runtime *runtime;
293 if (!snd_pcm_running(substream))
294 return;
295 runtime = substream->runtime;
296 dreamcastcard = substream->pcm->private_data;
297
298 play_period =
299 frames_to_bytes(runtime,
300 readl
301 (AICA_CONTROL_CHANNEL_SAMPLE_NUMBER)) /
302 AICA_PERIOD_SIZE;
303 if (play_period == dreamcastcard->current_period) {
304
305 mod_timer(&(dreamcastcard->timer), jiffies + 1);
306 return;
307 }
308 if (runtime->channels > 1)
309 dreamcastcard->current_period = play_period;
310 if (unlikely(dreamcastcard->dma_check == 0))
311 dreamcastcard->dma_check = 1;
312 schedule_work(&(dreamcastcard->spu_dma_work));
313}
314
315static void spu_begin_dma(struct snd_pcm_substream *substream)
316{
317 struct snd_card_aica *dreamcastcard;
318 dreamcastcard = substream->pcm->private_data;
319
320 schedule_work(&(dreamcastcard->spu_dma_work));
321 mod_timer(&dreamcastcard->timer, jiffies + 4);
322}
323
324static 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
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;
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
353static int snd_aicapcm_pcm_sync_stop(struct snd_pcm_substream *substream)
354{
355 struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
356
357 timer_delete_sync(&dreamcastcard->timer);
358 cancel_work_sync(&dreamcastcard->spu_dma_work);
359 return 0;
360}
361
362static int snd_aicapcm_pcm_close(struct snd_pcm_substream
363 *substream)
364{
365 struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
366 dreamcastcard->substream = NULL;
367 kfree(dreamcastcard->channel);
368 spu_disable();
369 return 0;
370}
371
372static int snd_aicapcm_pcm_prepare(struct snd_pcm_substream
373 *substream)
374{
375 struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
376 if ((substream->runtime)->format == SNDRV_PCM_FORMAT_S16_LE)
377 dreamcastcard->channel->sfmt = SM_16BIT;
378 dreamcastcard->channel->freq = substream->runtime->rate;
379 dreamcastcard->substream = substream;
380 return 0;
381}
382
383static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
384 *substream, int cmd)
385{
386 switch (cmd) {
387 case SNDRV_PCM_TRIGGER_START:
388 spu_begin_dma(substream);
389 break;
390 case SNDRV_PCM_TRIGGER_STOP:
391 aica_chn_halt();
392 break;
393 default:
394 return -EINVAL;
395 }
396 return 0;
397}
398
399static unsigned long snd_aicapcm_pcm_pointer(struct snd_pcm_substream
400 *substream)
401{
402 return readl(AICA_CONTROL_CHANNEL_SAMPLE_NUMBER);
403}
404
405static const struct snd_pcm_ops snd_aicapcm_playback_ops = {
406 .open = snd_aicapcm_pcm_open,
407 .close = snd_aicapcm_pcm_close,
408 .prepare = snd_aicapcm_pcm_prepare,
409 .trigger = snd_aicapcm_pcm_trigger,
410 .pointer = snd_aicapcm_pcm_pointer,
411 .sync_stop = snd_aicapcm_pcm_sync_stop,
412};
413
414
415static int __init snd_aicapcmchip(struct snd_card_aica
416 *dreamcastcard, int pcm_index)
417{
418 struct snd_pcm *pcm;
419 int err;
420
421 err =
422 snd_pcm_new(dreamcastcard->card, "AICA PCM", pcm_index, 1, 0,
423 &pcm);
424 if (unlikely(err < 0))
425 return err;
426 pcm->private_data = dreamcastcard;
427 strscpy(pcm->name, "AICA PCM");
428 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
429 &snd_aicapcm_playback_ops);
430
431 snd_pcm_set_managed_buffer_all(pcm,
432 SNDRV_DMA_TYPE_CONTINUOUS,
433 NULL,
434 AICA_BUFFER_SIZE,
435 AICA_BUFFER_SIZE);
436 return 0;
437}
438
439
440#define aica_pcmswitch_info snd_ctl_boolean_mono_info
441
442static int aica_pcmswitch_get(struct snd_kcontrol *kcontrol,
443 struct snd_ctl_elem_value *ucontrol)
444{
445 ucontrol->value.integer.value[0] = 1;
446 return 0;
447}
448
449static int aica_pcmswitch_put(struct snd_kcontrol *kcontrol,
450 struct snd_ctl_elem_value *ucontrol)
451{
452 if (ucontrol->value.integer.value[0] == 1)
453 return 0;
454 else
455 aica_chn_halt();
456 return 0;
457}
458
459static int aica_pcmvolume_info(struct snd_kcontrol *kcontrol,
460 struct snd_ctl_elem_info *uinfo)
461{
462 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
463 uinfo->count = 1;
464 uinfo->value.integer.min = 0;
465 uinfo->value.integer.max = 0xFF;
466 return 0;
467}
468
469static int aica_pcmvolume_get(struct snd_kcontrol *kcontrol,
470 struct snd_ctl_elem_value *ucontrol)
471{
472 struct snd_card_aica *dreamcastcard = snd_kcontrol_chip(kcontrol);
473
474 if (unlikely(!dreamcastcard->channel))
475 return -ETXTBSY;
476 ucontrol->value.integer.value[0] = dreamcastcard->channel->vol;
477 return 0;
478}
479
480static int aica_pcmvolume_put(struct snd_kcontrol *kcontrol,
481 struct snd_ctl_elem_value *ucontrol)
482{
483 struct snd_card_aica *dreamcastcard = snd_kcontrol_chip(kcontrol);
484 unsigned int vol;
485
486 if (unlikely(!dreamcastcard->channel))
487 return -ETXTBSY;
488 vol = ucontrol->value.integer.value[0];
489 if (vol > 0xff)
490 return -EINVAL;
491 if (unlikely(dreamcastcard->channel->vol == vol))
492 return 0;
493 dreamcastcard->channel->vol = ucontrol->value.integer.value[0];
494 dreamcastcard->master_volume = ucontrol->value.integer.value[0];
495 spu_memload(AICA_CHANNEL0_CONTROL_OFFSET,
496 dreamcastcard->channel, sizeof(struct aica_channel));
497 return 1;
498}
499
500static const struct snd_kcontrol_new snd_aica_pcmswitch_control = {
501 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
502 .name = "PCM Playback Switch",
503 .index = 0,
504 .info = aica_pcmswitch_info,
505 .get = aica_pcmswitch_get,
506 .put = aica_pcmswitch_put
507};
508
509static const struct snd_kcontrol_new snd_aica_pcmvolume_control = {
510 .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
511 .name = "PCM Playback Volume",
512 .index = 0,
513 .info = aica_pcmvolume_info,
514 .get = aica_pcmvolume_get,
515 .put = aica_pcmvolume_put
516};
517
518static int load_aica_firmware(void)
519{
520 int err;
521 const struct firmware *fw_entry;
522 spu_reset();
523 err = request_firmware(&fw_entry, "aica_firmware.bin", &pd->dev);
524 if (unlikely(err))
525 return err;
526
527 spu_disable();
528 spu_memload(0, fw_entry->data, fw_entry->size);
529 spu_enable();
530 release_firmware(fw_entry);
531 return err;
532}
533
534static int add_aicamixer_controls(struct snd_card_aica *dreamcastcard)
535{
536 int err;
537 err = snd_ctl_add
538 (dreamcastcard->card,
539 snd_ctl_new1(&snd_aica_pcmvolume_control, dreamcastcard));
540 if (unlikely(err < 0))
541 return err;
542 err = snd_ctl_add
543 (dreamcastcard->card,
544 snd_ctl_new1(&snd_aica_pcmswitch_control, dreamcastcard));
545 if (unlikely(err < 0))
546 return err;
547 return 0;
548}
549
550static void snd_aica_remove(struct platform_device *devptr)
551{
552 struct snd_card_aica *dreamcastcard;
553 dreamcastcard = platform_get_drvdata(devptr);
554 snd_card_free(dreamcastcard->card);
555 kfree(dreamcastcard);
556}
557
558static int snd_aica_probe(struct platform_device *devptr)
559{
560 int err;
561 struct snd_card_aica *dreamcastcard;
562 dreamcastcard = kzalloc(sizeof(struct snd_card_aica), GFP_KERNEL);
563 if (unlikely(!dreamcastcard))
564 return -ENOMEM;
565 err = snd_card_new(&devptr->dev, index, SND_AICA_DRIVER,
566 THIS_MODULE, 0, &dreamcastcard->card);
567 if (unlikely(err < 0)) {
568 kfree(dreamcastcard);
569 return err;
570 }
571 strscpy(dreamcastcard->card->driver, "snd_aica");
572 strscpy(dreamcastcard->card->shortname, SND_AICA_DRIVER);
573 strscpy(dreamcastcard->card->longname,
574 "Yamaha AICA Super Intelligent Sound Processor for SEGA Dreamcast");
575
576 INIT_WORK(&(dreamcastcard->spu_dma_work), run_spu_dma);
577 timer_setup(&dreamcastcard->timer, aica_period_elapsed, 0);
578
579 err = snd_aicapcmchip(dreamcastcard, 0);
580 if (unlikely(err < 0))
581 goto freedreamcast;
582
583 err = add_aicamixer_controls(dreamcastcard);
584 if (unlikely(err < 0))
585 goto freedreamcast;
586
587 err = snd_card_register(dreamcastcard->card);
588 if (unlikely(err < 0))
589 goto freedreamcast;
590 platform_set_drvdata(devptr, dreamcastcard);
591 dev_info(&devptr->dev,
592 "ALSA Driver for Yamaha AICA Super Intelligent Sound Processor\n");
593 return 0;
594 freedreamcast:
595 snd_card_free(dreamcastcard->card);
596 kfree(dreamcastcard);
597 return err;
598}
599
600static struct platform_driver snd_aica_driver = {
601 .probe = snd_aica_probe,
602 .remove = snd_aica_remove,
603 .driver = {
604 .name = SND_AICA_DRIVER,
605 },
606};
607
608static int __init aica_init(void)
609{
610 int err;
611 err = platform_driver_register(&snd_aica_driver);
612 if (unlikely(err < 0))
613 return err;
614 pd = platform_device_register_simple(SND_AICA_DRIVER, -1,
615 aica_memory_space, 2);
616 if (IS_ERR(pd)) {
617 platform_driver_unregister(&snd_aica_driver);
618 return PTR_ERR(pd);
619 }
620
621 return load_aica_firmware();
622}
623
624static void __exit aica_exit(void)
625{
626 platform_device_unregister(pd);
627 platform_driver_unregister(&snd_aica_driver);
628
629 spu_reset();
630}
631
632module_init(aica_init);
633module_exit(aica_exit);
634
