forked from alistair23/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
aaci.c
1108 lines (896 loc) · 24.7 KB
/
aaci.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/sound/arm/aaci.c - ARM PrimeCell AACI PL041 driver
*
* Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
*
* Documentation: ARM DDI 0173B
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/amba/bus.h>
#include <linux/io.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/ac97_codec.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "aaci.h"
#define DRIVER_NAME "aaci-pl041"
#define FRAME_PERIOD_US 21
/*
* PM support is not complete. Turn it off.
*/
#undef CONFIG_PM
static void aaci_ac97_select_codec(struct aaci *aaci, struct snd_ac97 *ac97)
{
u32 v, maincr = aaci->maincr | MAINCR_SCRA(ac97->num);
/*
* Ensure that the slot 1/2 RX registers are empty.
*/
v = readl(aaci->base + AACI_SLFR);
if (v & SLFR_2RXV)
readl(aaci->base + AACI_SL2RX);
if (v & SLFR_1RXV)
readl(aaci->base + AACI_SL1RX);
if (maincr != readl(aaci->base + AACI_MAINCR)) {
writel(maincr, aaci->base + AACI_MAINCR);
readl(aaci->base + AACI_MAINCR);
udelay(1);
}
}
/*
* P29:
* The recommended use of programming the external codec through slot 1
* and slot 2 data is to use the channels during setup routines and the
* slot register at any other time. The data written into slot 1, slot 2
* and slot 12 registers is transmitted only when their corresponding
* SI1TxEn, SI2TxEn and SI12TxEn bits are set in the AACI_MAINCR
* register.
*/
static void aaci_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
unsigned short val)
{
struct aaci *aaci = ac97->private_data;
int timeout;
u32 v;
if (ac97->num >= 4)
return;
mutex_lock(&aaci->ac97_sem);
aaci_ac97_select_codec(aaci, ac97);
/*
* P54: You must ensure that AACI_SL2TX is always written
* to, if required, before data is written to AACI_SL1TX.
*/
writel(val << 4, aaci->base + AACI_SL2TX);
writel(reg << 12, aaci->base + AACI_SL1TX);
/* Initially, wait one frame period */
udelay(FRAME_PERIOD_US);
/* And then wait an additional eight frame periods for it to be sent */
timeout = FRAME_PERIOD_US * 8;
do {
udelay(1);
v = readl(aaci->base + AACI_SLFR);
} while ((v & (SLFR_1TXB|SLFR_2TXB)) && --timeout);
if (v & (SLFR_1TXB|SLFR_2TXB))
dev_err(&aaci->dev->dev,
"timeout waiting for write to complete\n");
mutex_unlock(&aaci->ac97_sem);
}
/*
* Read an AC'97 register.
*/
static unsigned short aaci_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
struct aaci *aaci = ac97->private_data;
int timeout, retries = 10;
u32 v;
if (ac97->num >= 4)
return ~0;
mutex_lock(&aaci->ac97_sem);
aaci_ac97_select_codec(aaci, ac97);
/*
* Write the register address to slot 1.
*/
writel((reg << 12) | (1 << 19), aaci->base + AACI_SL1TX);
/* Initially, wait one frame period */
udelay(FRAME_PERIOD_US);
/* And then wait an additional eight frame periods for it to be sent */
timeout = FRAME_PERIOD_US * 8;
do {
udelay(1);
v = readl(aaci->base + AACI_SLFR);
} while ((v & SLFR_1TXB) && --timeout);
if (v & SLFR_1TXB) {
dev_err(&aaci->dev->dev, "timeout on slot 1 TX busy\n");
v = ~0;
goto out;
}
/* Now wait for the response frame */
udelay(FRAME_PERIOD_US);
/* And then wait an additional eight frame periods for data */
timeout = FRAME_PERIOD_US * 8;
do {
udelay(1);
cond_resched();
v = readl(aaci->base + AACI_SLFR) & (SLFR_1RXV|SLFR_2RXV);
} while ((v != (SLFR_1RXV|SLFR_2RXV)) && --timeout);
if (v != (SLFR_1RXV|SLFR_2RXV)) {
dev_err(&aaci->dev->dev, "timeout on RX valid\n");
v = ~0;
goto out;
}
do {
v = readl(aaci->base + AACI_SL1RX) >> 12;
if (v == reg) {
v = readl(aaci->base + AACI_SL2RX) >> 4;
break;
} else if (--retries) {
dev_warn(&aaci->dev->dev,
"ac97 read back fail. retry\n");
continue;
} else {
dev_warn(&aaci->dev->dev,
"wrong ac97 register read back (%x != %x)\n",
v, reg);
v = ~0;
}
} while (retries);
out:
mutex_unlock(&aaci->ac97_sem);
return v;
}
static inline void
aaci_chan_wait_ready(struct aaci_runtime *aacirun, unsigned long mask)
{
u32 val;
int timeout = 5000;
do {
udelay(1);
val = readl(aacirun->base + AACI_SR);
} while (val & mask && timeout--);
}
/*
* Interrupt support.
*/
static void aaci_fifo_irq(struct aaci *aaci, int channel, u32 mask)
{
if (mask & ISR_ORINTR) {
dev_warn(&aaci->dev->dev, "RX overrun on chan %d\n", channel);
writel(ICLR_RXOEC1 << channel, aaci->base + AACI_INTCLR);
}
if (mask & ISR_RXTOINTR) {
dev_warn(&aaci->dev->dev, "RX timeout on chan %d\n", channel);
writel(ICLR_RXTOFEC1 << channel, aaci->base + AACI_INTCLR);
}
if (mask & ISR_RXINTR) {
struct aaci_runtime *aacirun = &aaci->capture;
bool period_elapsed = false;
void *ptr;
if (!aacirun->substream || !aacirun->start) {
dev_warn(&aaci->dev->dev, "RX interrupt???\n");
writel(0, aacirun->base + AACI_IE);
return;
}
spin_lock(&aacirun->lock);
ptr = aacirun->ptr;
do {
unsigned int len = aacirun->fifo_bytes;
u32 val;
if (aacirun->bytes <= 0) {
aacirun->bytes += aacirun->period;
period_elapsed = true;
}
if (!(aacirun->cr & CR_EN))
break;
val = readl(aacirun->base + AACI_SR);
if (!(val & SR_RXHF))
break;
if (!(val & SR_RXFF))
len >>= 1;
aacirun->bytes -= len;
/* reading 16 bytes at a time */
for( ; len > 0; len -= 16) {
asm(
"ldmia %1, {r0, r1, r2, r3}\n\t"
"stmia %0!, {r0, r1, r2, r3}"
: "+r" (ptr)
: "r" (aacirun->fifo)
: "r0", "r1", "r2", "r3", "cc");
if (ptr >= aacirun->end)
ptr = aacirun->start;
}
} while(1);
aacirun->ptr = ptr;
spin_unlock(&aacirun->lock);
if (period_elapsed)
snd_pcm_period_elapsed(aacirun->substream);
}
if (mask & ISR_URINTR) {
dev_dbg(&aaci->dev->dev, "TX underrun on chan %d\n", channel);
writel(ICLR_TXUEC1 << channel, aaci->base + AACI_INTCLR);
}
if (mask & ISR_TXINTR) {
struct aaci_runtime *aacirun = &aaci->playback;
bool period_elapsed = false;
void *ptr;
if (!aacirun->substream || !aacirun->start) {
dev_warn(&aaci->dev->dev, "TX interrupt???\n");
writel(0, aacirun->base + AACI_IE);
return;
}
spin_lock(&aacirun->lock);
ptr = aacirun->ptr;
do {
unsigned int len = aacirun->fifo_bytes;
u32 val;
if (aacirun->bytes <= 0) {
aacirun->bytes += aacirun->period;
period_elapsed = true;
}
if (!(aacirun->cr & CR_EN))
break;
val = readl(aacirun->base + AACI_SR);
if (!(val & SR_TXHE))
break;
if (!(val & SR_TXFE))
len >>= 1;
aacirun->bytes -= len;
/* writing 16 bytes at a time */
for ( ; len > 0; len -= 16) {
asm(
"ldmia %0!, {r0, r1, r2, r3}\n\t"
"stmia %1, {r0, r1, r2, r3}"
: "+r" (ptr)
: "r" (aacirun->fifo)
: "r0", "r1", "r2", "r3", "cc");
if (ptr >= aacirun->end)
ptr = aacirun->start;
}
} while (1);
aacirun->ptr = ptr;
spin_unlock(&aacirun->lock);
if (period_elapsed)
snd_pcm_period_elapsed(aacirun->substream);
}
}
static irqreturn_t aaci_irq(int irq, void *devid)
{
struct aaci *aaci = devid;
u32 mask;
int i;
mask = readl(aaci->base + AACI_ALLINTS);
if (mask) {
u32 m = mask;
for (i = 0; i < 4; i++, m >>= 7) {
if (m & 0x7f) {
aaci_fifo_irq(aaci, i, m);
}
}
}
return mask ? IRQ_HANDLED : IRQ_NONE;
}
/*
* ALSA support.
*/
static const struct snd_pcm_hardware aaci_hw_info = {
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_RESUME,
/*
* ALSA doesn't support 18-bit or 20-bit packed into 32-bit
* words. It also doesn't support 12-bit at all.
*/
.formats = SNDRV_PCM_FMTBIT_S16_LE,
/* rates are setup from the AC'97 codec */
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = 64 * 1024,
.period_bytes_min = 256,
.period_bytes_max = PAGE_SIZE,
.periods_min = 4,
.periods_max = PAGE_SIZE / 16,
};
/*
* We can support two and four channel audio. Unfortunately
* six channel audio requires a non-standard channel ordering:
* 2 -> FL(3), FR(4)
* 4 -> FL(3), FR(4), SL(7), SR(8)
* 6 -> FL(3), FR(4), SL(7), SR(8), C(6), LFE(9) (required)
* FL(3), FR(4), C(6), SL(7), SR(8), LFE(9) (actual)
* This requires an ALSA configuration file to correct.
*/
static int aaci_rule_channels(struct snd_pcm_hw_params *p,
struct snd_pcm_hw_rule *rule)
{
static unsigned int channel_list[] = { 2, 4, 6 };
struct aaci *aaci = rule->private;
unsigned int mask = 1 << 0, slots;
/* pcms[0] is the our 5.1 PCM instance. */
slots = aaci->ac97_bus->pcms[0].r[0].slots;
if (slots & (1 << AC97_SLOT_PCM_SLEFT)) {
mask |= 1 << 1;
if (slots & (1 << AC97_SLOT_LFE))
mask |= 1 << 2;
}
return snd_interval_list(hw_param_interval(p, rule->var),
ARRAY_SIZE(channel_list), channel_list, mask);
}
static int aaci_pcm_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct aaci *aaci = substream->private_data;
struct aaci_runtime *aacirun;
int ret = 0;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
aacirun = &aaci->playback;
} else {
aacirun = &aaci->capture;
}
aacirun->substream = substream;
runtime->private_data = aacirun;
runtime->hw = aaci_hw_info;
runtime->hw.rates = aacirun->pcm->rates;
snd_pcm_limit_hw_rates(runtime);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
runtime->hw.channels_max = 6;
/* Add rule describing channel dependency. */
ret = snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_CHANNELS,
aaci_rule_channels, aaci,
SNDRV_PCM_HW_PARAM_CHANNELS, -1);
if (ret)
return ret;
if (aacirun->pcm->r[1].slots)
snd_ac97_pcm_double_rate_rules(runtime);
}
/*
* ALSA wants the byte-size of the FIFOs. As we only support
* 16-bit samples, this is twice the FIFO depth irrespective
* of whether it's in compact mode or not.
*/
runtime->hw.fifo_size = aaci->fifo_depth * 2;
mutex_lock(&aaci->irq_lock);
if (!aaci->users++) {
ret = request_irq(aaci->dev->irq[0], aaci_irq,
IRQF_SHARED, DRIVER_NAME, aaci);
if (ret != 0)
aaci->users--;
}
mutex_unlock(&aaci->irq_lock);
return ret;
}
/*
* Common ALSA stuff
*/
static int aaci_pcm_close(struct snd_pcm_substream *substream)
{
struct aaci *aaci = substream->private_data;
struct aaci_runtime *aacirun = substream->runtime->private_data;
WARN_ON(aacirun->cr & CR_EN);
aacirun->substream = NULL;
mutex_lock(&aaci->irq_lock);
if (!--aaci->users)
free_irq(aaci->dev->irq[0], aaci);
mutex_unlock(&aaci->irq_lock);
return 0;
}
static int aaci_pcm_hw_free(struct snd_pcm_substream *substream)
{
struct aaci_runtime *aacirun = substream->runtime->private_data;
/*
* This must not be called with the device enabled.
*/
WARN_ON(aacirun->cr & CR_EN);
if (aacirun->pcm_open)
snd_ac97_pcm_close(aacirun->pcm);
aacirun->pcm_open = 0;
/*
* Clear out the DMA and any allocated buffers.
*/
snd_pcm_lib_free_pages(substream);
return 0;
}
/* Channel to slot mask */
static const u32 channels_to_slotmask[] = {
[2] = CR_SL3 | CR_SL4,
[4] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8,
[6] = CR_SL3 | CR_SL4 | CR_SL7 | CR_SL8 | CR_SL6 | CR_SL9,
};
static int aaci_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct aaci_runtime *aacirun = substream->runtime->private_data;
unsigned int channels = params_channels(params);
unsigned int rate = params_rate(params);
int dbl = rate > 48000;
int err;
aaci_pcm_hw_free(substream);
if (aacirun->pcm_open) {
snd_ac97_pcm_close(aacirun->pcm);
aacirun->pcm_open = 0;
}
/* channels is already limited to 2, 4, or 6 by aaci_rule_channels */
if (dbl && channels != 2)
return -EINVAL;
err = snd_pcm_lib_malloc_pages(substream,
params_buffer_bytes(params));
if (err >= 0) {
struct aaci *aaci = substream->private_data;
err = snd_ac97_pcm_open(aacirun->pcm, rate, channels,
aacirun->pcm->r[dbl].slots);
aacirun->pcm_open = err == 0;
aacirun->cr = CR_FEN | CR_COMPACT | CR_SZ16;
aacirun->cr |= channels_to_slotmask[channels + dbl * 2];
/*
* fifo_bytes is the number of bytes we transfer to/from
* the FIFO, including padding. So that's x4. As we're
* in compact mode, the FIFO is half the size.
*/
aacirun->fifo_bytes = aaci->fifo_depth * 4 / 2;
}
return err;
}
static int aaci_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct aaci_runtime *aacirun = runtime->private_data;
aacirun->period = snd_pcm_lib_period_bytes(substream);
aacirun->start = runtime->dma_area;
aacirun->end = aacirun->start + snd_pcm_lib_buffer_bytes(substream);
aacirun->ptr = aacirun->start;
aacirun->bytes = aacirun->period;
return 0;
}
static snd_pcm_uframes_t aaci_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct aaci_runtime *aacirun = runtime->private_data;
ssize_t bytes = aacirun->ptr - aacirun->start;
return bytes_to_frames(runtime, bytes);
}
/*
* Playback specific ALSA stuff
*/
static void aaci_pcm_playback_stop(struct aaci_runtime *aacirun)
{
u32 ie;
ie = readl(aacirun->base + AACI_IE);
ie &= ~(IE_URIE|IE_TXIE);
writel(ie, aacirun->base + AACI_IE);
aacirun->cr &= ~CR_EN;
aaci_chan_wait_ready(aacirun, SR_TXB);
writel(aacirun->cr, aacirun->base + AACI_TXCR);
}
static void aaci_pcm_playback_start(struct aaci_runtime *aacirun)
{
u32 ie;
aaci_chan_wait_ready(aacirun, SR_TXB);
aacirun->cr |= CR_EN;
ie = readl(aacirun->base + AACI_IE);
ie |= IE_URIE | IE_TXIE;
writel(ie, aacirun->base + AACI_IE);
writel(aacirun->cr, aacirun->base + AACI_TXCR);
}
static int aaci_pcm_playback_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct aaci_runtime *aacirun = substream->runtime->private_data;
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&aacirun->lock, flags);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
aaci_pcm_playback_start(aacirun);
break;
case SNDRV_PCM_TRIGGER_RESUME:
aaci_pcm_playback_start(aacirun);
break;
case SNDRV_PCM_TRIGGER_STOP:
aaci_pcm_playback_stop(aacirun);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
aaci_pcm_playback_stop(aacirun);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
break;
default:
ret = -EINVAL;
}
spin_unlock_irqrestore(&aacirun->lock, flags);
return ret;
}
static const struct snd_pcm_ops aaci_playback_ops = {
.open = aaci_pcm_open,
.close = aaci_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = aaci_pcm_hw_params,
.hw_free = aaci_pcm_hw_free,
.prepare = aaci_pcm_prepare,
.trigger = aaci_pcm_playback_trigger,
.pointer = aaci_pcm_pointer,
};
static void aaci_pcm_capture_stop(struct aaci_runtime *aacirun)
{
u32 ie;
aaci_chan_wait_ready(aacirun, SR_RXB);
ie = readl(aacirun->base + AACI_IE);
ie &= ~(IE_ORIE | IE_RXIE);
writel(ie, aacirun->base+AACI_IE);
aacirun->cr &= ~CR_EN;
writel(aacirun->cr, aacirun->base + AACI_RXCR);
}
static void aaci_pcm_capture_start(struct aaci_runtime *aacirun)
{
u32 ie;
aaci_chan_wait_ready(aacirun, SR_RXB);
#ifdef DEBUG
/* RX Timeout value: bits 28:17 in RXCR */
aacirun->cr |= 0xf << 17;
#endif
aacirun->cr |= CR_EN;
writel(aacirun->cr, aacirun->base + AACI_RXCR);
ie = readl(aacirun->base + AACI_IE);
ie |= IE_ORIE |IE_RXIE; // overrun and rx interrupt -- half full
writel(ie, aacirun->base + AACI_IE);
}
static int aaci_pcm_capture_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct aaci_runtime *aacirun = substream->runtime->private_data;
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&aacirun->lock, flags);
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
aaci_pcm_capture_start(aacirun);
break;
case SNDRV_PCM_TRIGGER_RESUME:
aaci_pcm_capture_start(aacirun);
break;
case SNDRV_PCM_TRIGGER_STOP:
aaci_pcm_capture_stop(aacirun);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
aaci_pcm_capture_stop(aacirun);
break;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
break;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
break;
default:
ret = -EINVAL;
}
spin_unlock_irqrestore(&aacirun->lock, flags);
return ret;
}
static int aaci_pcm_capture_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct aaci *aaci = substream->private_data;
aaci_pcm_prepare(substream);
/* allow changing of sample rate */
aaci_ac97_write(aaci->ac97, AC97_EXTENDED_STATUS, 0x0001); /* VRA */
aaci_ac97_write(aaci->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
aaci_ac97_write(aaci->ac97, AC97_PCM_MIC_ADC_RATE, runtime->rate);
/* Record select: Mic: 0, Aux: 3, Line: 4 */
aaci_ac97_write(aaci->ac97, AC97_REC_SEL, 0x0404);
return 0;
}
static const struct snd_pcm_ops aaci_capture_ops = {
.open = aaci_pcm_open,
.close = aaci_pcm_close,
.ioctl = snd_pcm_lib_ioctl,
.hw_params = aaci_pcm_hw_params,
.hw_free = aaci_pcm_hw_free,
.prepare = aaci_pcm_capture_prepare,
.trigger = aaci_pcm_capture_trigger,
.pointer = aaci_pcm_pointer,
};
/*
* Power Management.
*/
#ifdef CONFIG_PM
static int aaci_do_suspend(struct snd_card *card)
{
struct aaci *aaci = card->private_data;
snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
return 0;
}
static int aaci_do_resume(struct snd_card *card)
{
snd_power_change_state(card, SNDRV_CTL_POWER_D0);
return 0;
}
static int aaci_suspend(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
return card ? aaci_do_suspend(card) : 0;
}
static int aaci_resume(struct device *dev)
{
struct snd_card *card = dev_get_drvdata(dev);
return card ? aaci_do_resume(card) : 0;
}
static SIMPLE_DEV_PM_OPS(aaci_dev_pm_ops, aaci_suspend, aaci_resume);
#define AACI_DEV_PM_OPS (&aaci_dev_pm_ops)
#else
#define AACI_DEV_PM_OPS NULL
#endif
static const struct ac97_pcm ac97_defs[] = {
[0] = { /* Front PCM */
.exclusive = 1,
.r = {
[0] = {
.slots = (1 << AC97_SLOT_PCM_LEFT) |
(1 << AC97_SLOT_PCM_RIGHT) |
(1 << AC97_SLOT_PCM_CENTER) |
(1 << AC97_SLOT_PCM_SLEFT) |
(1 << AC97_SLOT_PCM_SRIGHT) |
(1 << AC97_SLOT_LFE),
},
[1] = {
.slots = (1 << AC97_SLOT_PCM_LEFT) |
(1 << AC97_SLOT_PCM_RIGHT) |
(1 << AC97_SLOT_PCM_LEFT_0) |
(1 << AC97_SLOT_PCM_RIGHT_0),
},
},
},
[1] = { /* PCM in */
.stream = 1,
.exclusive = 1,
.r = {
[0] = {
.slots = (1 << AC97_SLOT_PCM_LEFT) |
(1 << AC97_SLOT_PCM_RIGHT),
},
},
},
[2] = { /* Mic in */
.stream = 1,
.exclusive = 1,
.r = {
[0] = {
.slots = (1 << AC97_SLOT_MIC),
},
},
}
};
static struct snd_ac97_bus_ops aaci_bus_ops = {
.write = aaci_ac97_write,
.read = aaci_ac97_read,
};
static int aaci_probe_ac97(struct aaci *aaci)
{
struct snd_ac97_template ac97_template;
struct snd_ac97_bus *ac97_bus;
struct snd_ac97 *ac97;
int ret;
/*
* Assert AACIRESET for 2us
*/
writel(0, aaci->base + AACI_RESET);
udelay(2);
writel(RESET_NRST, aaci->base + AACI_RESET);
/*
* Give the AC'97 codec more than enough time
* to wake up. (42us = ~2 frames at 48kHz.)
*/
udelay(FRAME_PERIOD_US * 2);
ret = snd_ac97_bus(aaci->card, 0, &aaci_bus_ops, aaci, &ac97_bus);
if (ret)
goto out;
ac97_bus->clock = 48000;
aaci->ac97_bus = ac97_bus;
memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
ac97_template.private_data = aaci;
ac97_template.num = 0;
ac97_template.scaps = AC97_SCAP_SKIP_MODEM;
ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
if (ret)
goto out;
aaci->ac97 = ac97;
/*
* Disable AC97 PC Beep input on audio codecs.
*/
if (ac97_is_audio(ac97))
snd_ac97_write_cache(ac97, AC97_PC_BEEP, 0x801e);
ret = snd_ac97_pcm_assign(ac97_bus, ARRAY_SIZE(ac97_defs), ac97_defs);
if (ret)
goto out;
aaci->playback.pcm = &ac97_bus->pcms[0];
aaci->capture.pcm = &ac97_bus->pcms[1];
out:
return ret;
}
static void aaci_free_card(struct snd_card *card)
{
struct aaci *aaci = card->private_data;
iounmap(aaci->base);
}
static struct aaci *aaci_init_card(struct amba_device *dev)
{
struct aaci *aaci;
struct snd_card *card;
int err;
err = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
THIS_MODULE, sizeof(struct aaci), &card);
if (err < 0)
return NULL;
card->private_free = aaci_free_card;
strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
strlcpy(card->shortname, "ARM AC'97 Interface", sizeof(card->shortname));
snprintf(card->longname, sizeof(card->longname),
"%s PL%03x rev%u at 0x%08llx, irq %d",
card->shortname, amba_part(dev), amba_rev(dev),
(unsigned long long)dev->res.start, dev->irq[0]);
aaci = card->private_data;
mutex_init(&aaci->ac97_sem);
mutex_init(&aaci->irq_lock);
aaci->card = card;
aaci->dev = dev;
/* Set MAINCR to allow slot 1 and 2 data IO */
aaci->maincr = MAINCR_IE | MAINCR_SL1RXEN | MAINCR_SL1TXEN |
MAINCR_SL2RXEN | MAINCR_SL2TXEN;
return aaci;
}
static int aaci_init_pcm(struct aaci *aaci)
{
struct snd_pcm *pcm;
int ret;
ret = snd_pcm_new(aaci->card, "AACI AC'97", 0, 1, 1, &pcm);
if (ret == 0) {
aaci->pcm = pcm;
pcm->private_data = aaci;
pcm->info_flags = 0;
strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &aaci_playback_ops);
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &aaci_capture_ops);
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
aaci->card->dev,
0, 64 * 1024);
}
return ret;
}
static unsigned int aaci_size_fifo(struct aaci *aaci)
{
struct aaci_runtime *aacirun = &aaci->playback;
int i;
/*
* Enable the channel, but don't assign it to any slots, so
* it won't empty onto the AC'97 link.
*/
writel(CR_FEN | CR_SZ16 | CR_EN, aacirun->base + AACI_TXCR);
for (i = 0; !(readl(aacirun->base + AACI_SR) & SR_TXFF) && i < 4096; i++)
writel(0, aacirun->fifo);
writel(0, aacirun->base + AACI_TXCR);
/*
* Re-initialise the AACI after the FIFO depth test, to
* ensure that the FIFOs are empty. Unfortunately, merely
* disabling the channel doesn't clear the FIFO.
*/
writel(aaci->maincr & ~MAINCR_IE, aaci->base + AACI_MAINCR);
readl(aaci->base + AACI_MAINCR);
udelay(1);
writel(aaci->maincr, aaci->base + AACI_MAINCR);
/*
* If we hit 4096 entries, we failed. Go back to the specified
* fifo depth.
*/
if (i == 4096)
i = 8;
return i;
}
static int aaci_probe(struct amba_device *dev,
const struct amba_id *id)
{
struct aaci *aaci;
int ret, i;
ret = amba_request_regions(dev, NULL);
if (ret)
return ret;
aaci = aaci_init_card(dev);
if (!aaci) {
ret = -ENOMEM;
goto out;
}
aaci->base = ioremap(dev->res.start, resource_size(&dev->res));