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37#include <linux/ioport.h>
38#include <linux/interrupt.h>
39#include <linux/init.h>
40#include <linux/slab.h>
41#include <linux/module.h>
42#include <sound/core.h>
43#include <sound/initval.h>
44#include <sound/pcm.h>
45#include <sound/pcm_params.h>
46#include <sound/ac97_codec.h>
47#include <asm/mach-au1x00/au1000.h>
48#include <asm/mach-au1x00/au1000_dma.h>
49
50MODULE_AUTHOR("Charles Eidsness <charles@cooper-street.com>");
51MODULE_DESCRIPTION("Au1000 AC'97 ALSA Driver");
52MODULE_LICENSE("GPL");
53MODULE_SUPPORTED_DEVICE("{{AMD,Au1000 AC'97}}");
54
55#define PLAYBACK 0
56#define CAPTURE 1
57#define AC97_SLOT_3 0x01
58#define AC97_SLOT_4 0x02
59#define AC97_SLOT_6 0x08
60#define AC97_CMD_IRQ 31
61#define READ 0
62#define WRITE 1
63#define READ_WAIT 2
64#define RW_DONE 3
65
66struct au1000_period
67{
68 u32 start;
69 u32 relative_end;
70 struct au1000_period * next;
71};
72
73
74struct au1000_ac97_reg {
75 u32 volatile config;
76 u32 volatile status;
77 u32 volatile data;
78 u32 volatile cmd;
79 u32 volatile cntrl;
80};
81
82struct audio_stream {
83 struct snd_pcm_substream *substream;
84 int dma;
85 spinlock_t dma_lock;
86 struct au1000_period * buffer;
87 unsigned int period_size;
88 unsigned int periods;
89};
90
91struct snd_au1000 {
92 struct snd_card *card;
93 struct au1000_ac97_reg volatile *ac97_ioport;
94
95 struct resource *ac97_res_port;
96 spinlock_t ac97_lock;
97 struct snd_ac97 *ac97;
98
99 struct snd_pcm *pcm;
100 struct audio_stream *stream[2];
101};
102
103
104static void
105au1000_set_ac97_xmit_slots(struct snd_au1000 *au1000, long xmit_slots)
106{
107 u32 volatile ac97_config;
108
109 spin_lock(&au1000->ac97_lock);
110 ac97_config = au1000->ac97_ioport->config;
111 ac97_config = ac97_config & ~AC97C_XMIT_SLOTS_MASK;
112 ac97_config |= (xmit_slots << AC97C_XMIT_SLOTS_BIT);
113 au1000->ac97_ioport->config = ac97_config;
114 spin_unlock(&au1000->ac97_lock);
115}
116
117static void
118au1000_set_ac97_recv_slots(struct snd_au1000 *au1000, long recv_slots)
119{
120 u32 volatile ac97_config;
121
122 spin_lock(&au1000->ac97_lock);
123 ac97_config = au1000->ac97_ioport->config;
124 ac97_config = ac97_config & ~AC97C_RECV_SLOTS_MASK;
125 ac97_config |= (recv_slots << AC97C_RECV_SLOTS_BIT);
126 au1000->ac97_ioport->config = ac97_config;
127 spin_unlock(&au1000->ac97_lock);
128}
129
130
131static void
132au1000_release_dma_link(struct audio_stream *stream)
133{
134 struct au1000_period * pointer;
135 struct au1000_period * pointer_next;
136
137 stream->period_size = 0;
138 stream->periods = 0;
139 pointer = stream->buffer;
140 if (! pointer)
141 return;
142 do {
143 pointer_next = pointer->next;
144 kfree(pointer);
145 pointer = pointer_next;
146 } while (pointer != stream->buffer);
147 stream->buffer = NULL;
148}
149
150static int
151au1000_setup_dma_link(struct audio_stream *stream, unsigned int period_bytes,
152 unsigned int periods)
153{
154 struct snd_pcm_substream *substream = stream->substream;
155 struct snd_pcm_runtime *runtime = substream->runtime;
156 struct au1000_period *pointer;
157 unsigned long dma_start;
158 int i;
159
160 dma_start = virt_to_phys(runtime->dma_area);
161
162 if (stream->period_size == period_bytes &&
163 stream->periods == periods)
164 return 0;
165
166 au1000_release_dma_link(stream);
167
168 stream->period_size = period_bytes;
169 stream->periods = periods;
170
171 stream->buffer = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
172 if (! stream->buffer)
173 return -ENOMEM;
174 pointer = stream->buffer;
175 for (i = 0; i < periods; i++) {
176 pointer->start = (u32)(dma_start + (i * period_bytes));
177 pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
178 if (i < periods - 1) {
179 pointer->next = kmalloc(sizeof(struct au1000_period), GFP_KERNEL);
180 if (! pointer->next) {
181 au1000_release_dma_link(stream);
182 return -ENOMEM;
183 }
184 pointer = pointer->next;
185 }
186 }
187 pointer->next = stream->buffer;
188 return 0;
189}
190
191static void
192au1000_dma_stop(struct audio_stream *stream)
193{
194 if (snd_BUG_ON(!stream->buffer))
195 return;
196 disable_dma(stream->dma);
197}
198
199static void
200au1000_dma_start(struct audio_stream *stream)
201{
202 if (snd_BUG_ON(!stream->buffer))
203 return;
204
205 init_dma(stream->dma);
206 if (get_dma_active_buffer(stream->dma) == 0) {
207 clear_dma_done0(stream->dma);
208 set_dma_addr0(stream->dma, stream->buffer->start);
209 set_dma_count0(stream->dma, stream->period_size >> 1);
210 set_dma_addr1(stream->dma, stream->buffer->next->start);
211 set_dma_count1(stream->dma, stream->period_size >> 1);
212 } else {
213 clear_dma_done1(stream->dma);
214 set_dma_addr1(stream->dma, stream->buffer->start);
215 set_dma_count1(stream->dma, stream->period_size >> 1);
216 set_dma_addr0(stream->dma, stream->buffer->next->start);
217 set_dma_count0(stream->dma, stream->period_size >> 1);
218 }
219 enable_dma_buffers(stream->dma);
220 start_dma(stream->dma);
221}
222
223static irqreturn_t
224au1000_dma_interrupt(int irq, void *dev_id)
225{
226 struct audio_stream *stream = (struct audio_stream *) dev_id;
227 struct snd_pcm_substream *substream = stream->substream;
228
229 spin_lock(&stream->dma_lock);
230 switch (get_dma_buffer_done(stream->dma)) {
231 case DMA_D0:
232 stream->buffer = stream->buffer->next;
233 clear_dma_done0(stream->dma);
234 set_dma_addr0(stream->dma, stream->buffer->next->start);
235 set_dma_count0(stream->dma, stream->period_size >> 1);
236 enable_dma_buffer0(stream->dma);
237 break;
238 case DMA_D1:
239 stream->buffer = stream->buffer->next;
240 clear_dma_done1(stream->dma);
241 set_dma_addr1(stream->dma, stream->buffer->next->start);
242 set_dma_count1(stream->dma, stream->period_size >> 1);
243 enable_dma_buffer1(stream->dma);
244 break;
245 case (DMA_D0 | DMA_D1):
246 printk(KERN_ERR "DMA %d missed interrupt.\n",stream->dma);
247 au1000_dma_stop(stream);
248 au1000_dma_start(stream);
249 break;
250 case (~DMA_D0 & ~DMA_D1):
251 printk(KERN_ERR "DMA %d empty irq.\n",stream->dma);
252 }
253 spin_unlock(&stream->dma_lock);
254 snd_pcm_period_elapsed(substream);
255 return IRQ_HANDLED;
256}
257
258
259
260static unsigned int rates[] = {8000, 11025, 16000, 22050};
261static struct snd_pcm_hw_constraint_list hw_constraints_rates = {
262 .count = ARRAY_SIZE(rates),
263 .list = rates,
264 .mask = 0,
265};
266
267static struct snd_pcm_hardware snd_au1000_hw =
268{
269 .info = (SNDRV_PCM_INFO_INTERLEAVED | \
270 SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
271 .formats = SNDRV_PCM_FMTBIT_S16_LE,
272 .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
273 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050),
274 .rate_min = 8000,
275 .rate_max = 22050,
276 .channels_min = 1,
277 .channels_max = 2,
278 .buffer_bytes_max = 128*1024,
279 .period_bytes_min = 32,
280 .period_bytes_max = 16*1024,
281 .periods_min = 8,
282 .periods_max = 255,
283 .fifo_size = 16,
284};
285
286static int
287snd_au1000_playback_open(struct snd_pcm_substream *substream)
288{
289 struct snd_au1000 *au1000 = substream->pcm->private_data;
290
291 au1000->stream[PLAYBACK]->substream = substream;
292 au1000->stream[PLAYBACK]->buffer = NULL;
293 substream->private_data = au1000->stream[PLAYBACK];
294 substream->runtime->hw = snd_au1000_hw;
295 return (snd_pcm_hw_constraint_list(substream->runtime, 0,
296 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
297}
298
299static int
300snd_au1000_capture_open(struct snd_pcm_substream *substream)
301{
302 struct snd_au1000 *au1000 = substream->pcm->private_data;
303
304 au1000->stream[CAPTURE]->substream = substream;
305 au1000->stream[CAPTURE]->buffer = NULL;
306 substream->private_data = au1000->stream[CAPTURE];
307 substream->runtime->hw = snd_au1000_hw;
308 return (snd_pcm_hw_constraint_list(substream->runtime, 0,
309 SNDRV_PCM_HW_PARAM_RATE, &hw_constraints_rates) < 0);
310}
311
312static int
313snd_au1000_playback_close(struct snd_pcm_substream *substream)
314{
315 struct snd_au1000 *au1000 = substream->pcm->private_data;
316
317 au1000->stream[PLAYBACK]->substream = NULL;
318 return 0;
319}
320
321static int
322snd_au1000_capture_close(struct snd_pcm_substream *substream)
323{
324 struct snd_au1000 *au1000 = substream->pcm->private_data;
325
326 au1000->stream[CAPTURE]->substream = NULL;
327 return 0;
328}
329
330static int
331snd_au1000_hw_params(struct snd_pcm_substream *substream,
332 struct snd_pcm_hw_params *hw_params)
333{
334 struct audio_stream *stream = substream->private_data;
335 int err;
336
337 err = snd_pcm_lib_malloc_pages(substream,
338 params_buffer_bytes(hw_params));
339 if (err < 0)
340 return err;
341 return au1000_setup_dma_link(stream,
342 params_period_bytes(hw_params),
343 params_periods(hw_params));
344}
345
346static int
347snd_au1000_hw_free(struct snd_pcm_substream *substream)
348{
349 struct audio_stream *stream = substream->private_data;
350 au1000_release_dma_link(stream);
351 return snd_pcm_lib_free_pages(substream);
352}
353
354static int
355snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
356{
357 struct snd_au1000 *au1000 = substream->pcm->private_data;
358 struct snd_pcm_runtime *runtime = substream->runtime;
359
360 if (runtime->channels == 1)
361 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
362 else
363 au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
364 snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
365 return 0;
366}
367
368static int
369snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
370{
371 struct snd_au1000 *au1000 = substream->pcm->private_data;
372 struct snd_pcm_runtime *runtime = substream->runtime;
373
374 if (runtime->channels == 1)
375 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
376 else
377 au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
378 snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
379 return 0;
380}
381
382static int
383snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
384{
385 struct audio_stream *stream = substream->private_data;
386 int err = 0;
387
388 spin_lock(&stream->dma_lock);
389 switch (cmd) {
390 case SNDRV_PCM_TRIGGER_START:
391 au1000_dma_start(stream);
392 break;
393 case SNDRV_PCM_TRIGGER_STOP:
394 au1000_dma_stop(stream);
395 break;
396 default:
397 err = -EINVAL;
398 break;
399 }
400 spin_unlock(&stream->dma_lock);
401 return err;
402}
403
404static snd_pcm_uframes_t
405snd_au1000_pointer(struct snd_pcm_substream *substream)
406{
407 struct audio_stream *stream = substream->private_data;
408 struct snd_pcm_runtime *runtime = substream->runtime;
409 long location;
410
411 spin_lock(&stream->dma_lock);
412 location = get_dma_residue(stream->dma);
413 spin_unlock(&stream->dma_lock);
414 location = stream->buffer->relative_end - location;
415 if (location == -1)
416 location = 0;
417 return bytes_to_frames(runtime,location);
418}
419
420static struct snd_pcm_ops snd_card_au1000_playback_ops = {
421 .open = snd_au1000_playback_open,
422 .close = snd_au1000_playback_close,
423 .ioctl = snd_pcm_lib_ioctl,
424 .hw_params = snd_au1000_hw_params,
425 .hw_free = snd_au1000_hw_free,
426 .prepare = snd_au1000_playback_prepare,
427 .trigger = snd_au1000_trigger,
428 .pointer = snd_au1000_pointer,
429};
430
431static struct snd_pcm_ops snd_card_au1000_capture_ops = {
432 .open = snd_au1000_capture_open,
433 .close = snd_au1000_capture_close,
434 .ioctl = snd_pcm_lib_ioctl,
435 .hw_params = snd_au1000_hw_params,
436 .hw_free = snd_au1000_hw_free,
437 .prepare = snd_au1000_capture_prepare,
438 .trigger = snd_au1000_trigger,
439 .pointer = snd_au1000_pointer,
440};
441
442static int
443snd_au1000_pcm_new(struct snd_au1000 *au1000)
444{
445 struct snd_pcm *pcm;
446 int err;
447 unsigned long flags;
448
449 if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
450 return err;
451
452 snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
453 snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);
454
455 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
456 &snd_card_au1000_playback_ops);
457 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
458 &snd_card_au1000_capture_ops);
459
460 pcm->private_data = au1000;
461 pcm->info_flags = 0;
462 strcpy(pcm->name, "Au1000 AC97 PCM");
463
464 spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
465 spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);
466
467 flags = claim_dma_lock();
468 if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
469 "AC97 TX", au1000_dma_interrupt, 0,
470 au1000->stream[PLAYBACK])) < 0) {
471 release_dma_lock(flags);
472 return -EBUSY;
473 }
474 if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
475 "AC97 RX", au1000_dma_interrupt, 0,
476 au1000->stream[CAPTURE])) < 0){
477 release_dma_lock(flags);
478 return -EBUSY;
479 }
480
481 set_dma_mode(au1000->stream[PLAYBACK]->dma,
482 get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
483 set_dma_mode(au1000->stream[CAPTURE]->dma,
484 get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
485 release_dma_lock(flags);
486 au1000->pcm = pcm;
487 return 0;
488}
489
490
491
492
493static unsigned short
494snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
495{
496 struct snd_au1000 *au1000 = ac97->private_data;
497 u32 volatile cmd;
498 u16 volatile data;
499 int i;
500
501 spin_lock(&au1000->ac97_lock);
502
503
504 for (i = 0; i < 0x5000; i++)
505 if (!(au1000->ac97_ioport->status & AC97C_CP))
506 break;
507 if (i == 0x5000)
508 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
509
510 cmd = (u32) reg & AC97C_INDEX_MASK;
511 cmd |= AC97C_READ;
512 au1000->ac97_ioport->cmd = cmd;
513
514
515 for (i = 0; i < 0x5000; i++)
516 if (!(au1000->ac97_ioport->status & AC97C_CP))
517 break;
518 if (i == 0x5000) {
519 printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
520 spin_unlock(&au1000->ac97_lock);
521 return 0;
522 }
523
524 data = au1000->ac97_ioport->cmd & 0xffff;
525 spin_unlock(&au1000->ac97_lock);
526
527 return data;
528
529}
530
531
532static void
533snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
534{
535 struct snd_au1000 *au1000 = ac97->private_data;
536 u32 cmd;
537 int i;
538
539 spin_lock(&au1000->ac97_lock);
540
541
542 for (i = 0; i < 0x5000; i++)
543 if (!(au1000->ac97_ioport->status & AC97C_CP))
544 break;
545 if (i == 0x5000)
546 printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");
547
548 cmd = (u32) reg & AC97C_INDEX_MASK;
549 cmd &= ~AC97C_READ;
550 cmd |= ((u32) val << AC97C_WD_BIT);
551 au1000->ac97_ioport->cmd = cmd;
552 spin_unlock(&au1000->ac97_lock);
553}
554
555static int
556snd_au1000_ac97_new(struct snd_au1000 *au1000)
557{
558 int err;
559 struct snd_ac97_bus *pbus;
560 struct snd_ac97_template ac97;
561 static struct snd_ac97_bus_ops ops = {
562 .write = snd_au1000_ac97_write,
563 .read = snd_au1000_ac97_read,
564 };
565
566 if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
567 0x100000, "Au1x00 AC97")) == NULL) {
568 snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
569 return -EBUSY;
570 }
571 au1000->ac97_ioport = (struct au1000_ac97_reg *)
572 KSEG1ADDR(au1000->ac97_res_port->start);
573
574 spin_lock_init(&au1000->ac97_lock);
575
576
577
578 au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);
579
580
581 au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
582 udelay(10);
583 au1000->ac97_ioport->cntrl = AC97C_CE;
584 udelay(10);
585
586
587 au1000->ac97_ioport->config = AC97C_RESET;
588 udelay(10);
589 au1000->ac97_ioport->config = 0x0;
590 mdelay(5);
591
592
593 if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
594 return err;
595
596 memset(&ac97, 0, sizeof(ac97));
597 ac97.private_data = au1000;
598 if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
599 return err;
600
601 return 0;
602}
603
604
605
606void
607snd_au1000_free(struct snd_card *card)
608{
609 struct snd_au1000 *au1000 = card->private_data;
610
611 if (au1000->ac97_res_port) {
612
613 au1000->ac97_ioport->cntrl = AC97C_RS;
614 au1000->ac97_ioport = NULL;
615 release_and_free_resource(au1000->ac97_res_port);
616 }
617
618 if (au1000->stream[PLAYBACK]) {
619 if (au1000->stream[PLAYBACK]->dma >= 0)
620 free_au1000_dma(au1000->stream[PLAYBACK]->dma);
621 kfree(au1000->stream[PLAYBACK]);
622 }
623
624 if (au1000->stream[CAPTURE]) {
625 if (au1000->stream[CAPTURE]->dma >= 0)
626 free_au1000_dma(au1000->stream[CAPTURE]->dma);
627 kfree(au1000->stream[CAPTURE]);
628 }
629}
630
631
632static struct snd_card *au1000_card;
633
634static int __init
635au1000_init(void)
636{
637 int err;
638 struct snd_card *card;
639 struct snd_au1000 *au1000;
640
641 err = snd_card_create(-1, "AC97", THIS_MODULE,
642 sizeof(struct snd_au1000), &card);
643 if (err < 0)
644 return err;
645
646 card->private_free = snd_au1000_free;
647 au1000 = card->private_data;
648 au1000->card = card;
649
650 au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
651 au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
652
653 au1000->ac97_res_port = NULL;
654 if (au1000->stream[PLAYBACK])
655 au1000->stream[PLAYBACK]->dma = -1;
656 if (au1000->stream[CAPTURE ])
657 au1000->stream[CAPTURE ]->dma = -1;
658
659 if (au1000->stream[PLAYBACK] == NULL ||
660 au1000->stream[CAPTURE ] == NULL) {
661 snd_card_free(card);
662 return -ENOMEM;
663 }
664
665 if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
666 snd_card_free(card);
667 return err;
668 }
669
670 if ((err = snd_au1000_pcm_new(au1000)) < 0) {
671 snd_card_free(card);
672 return err;
673 }
674
675 strcpy(card->driver, "Au1000-AC97");
676 strcpy(card->shortname, "AMD Au1000-AC97");
677 sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");
678
679 if ((err = snd_card_register(card)) < 0) {
680 snd_card_free(card);
681 return err;
682 }
683
684 printk(KERN_INFO "ALSA AC97: Driver Initialized\n");
685 au1000_card = card;
686 return 0;
687}
688
689static void __exit au1000_exit(void)
690{
691 snd_card_free(au1000_card);
692}
693
694module_init(au1000_init);
695module_exit(au1000_exit);
696
697
