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