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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
|
// SPDX-License-Identifier: GPL-2.0
//
// Renesas RZ/G2L ASoC Serial Sound Interface (SSIF-2) Driver
//
// Copyright (C) 2021 Renesas Electronics Corp.
// Copyright (C) 2019 Chris Brandt.
//
#include <linux/clk.h>
#include <linux/dmaengine.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <sound/soc.h>
/* REGISTER OFFSET */
#define SSICR 0x000
#define SSISR 0x004
#define SSIFCR 0x010
#define SSIFSR 0x014
#define SSIFTDR 0x018
#define SSIFRDR 0x01c
#define SSIOFR 0x020
#define SSISCR 0x024
/* SSI REGISTER BITS */
#define SSICR_DWL(x) (((x) & 0x7) << 19)
#define SSICR_SWL(x) (((x) & 0x7) << 16)
#define SSICR_CKS BIT(30)
#define SSICR_TUIEN BIT(29)
#define SSICR_TOIEN BIT(28)
#define SSICR_RUIEN BIT(27)
#define SSICR_ROIEN BIT(26)
#define SSICR_MST BIT(14)
#define SSICR_BCKP BIT(13)
#define SSICR_LRCKP BIT(12)
#define SSICR_CKDV(x) (((x) & 0xf) << 4)
#define SSICR_TEN BIT(1)
#define SSICR_REN BIT(0)
#define SSISR_TUIRQ BIT(29)
#define SSISR_TOIRQ BIT(28)
#define SSISR_RUIRQ BIT(27)
#define SSISR_ROIRQ BIT(26)
#define SSISR_IIRQ BIT(25)
#define SSIFCR_AUCKE BIT(31)
#define SSIFCR_SSIRST BIT(16)
#define SSIFCR_TIE BIT(3)
#define SSIFCR_RIE BIT(2)
#define SSIFCR_TFRST BIT(1)
#define SSIFCR_RFRST BIT(0)
#define SSIFCR_FIFO_RST (SSIFCR_TFRST | SSIFCR_RFRST)
#define SSIFSR_TDC_MASK 0x3f
#define SSIFSR_TDC_SHIFT 24
#define SSIFSR_RDC_MASK 0x3f
#define SSIFSR_RDC_SHIFT 8
#define SSIFSR_TDE BIT(16)
#define SSIFSR_RDF BIT(0)
#define SSIOFR_LRCONT BIT(8)
#define SSISCR_TDES(x) (((x) & 0x1f) << 8)
#define SSISCR_RDFS(x) (((x) & 0x1f) << 0)
/* Pre allocated buffers sizes */
#define PREALLOC_BUFFER (SZ_32K)
#define PREALLOC_BUFFER_MAX (SZ_32K)
#define SSI_RATES SNDRV_PCM_RATE_8000_48000 /* 8k-44.1kHz */
#define SSI_FMTS SNDRV_PCM_FMTBIT_S16_LE
#define SSI_CHAN_MIN 2
#define SSI_CHAN_MAX 2
#define SSI_FIFO_DEPTH 32
struct rz_ssi_priv;
struct rz_ssi_stream {
struct rz_ssi_priv *priv;
struct snd_pcm_substream *substream;
int fifo_sample_size; /* sample capacity of SSI FIFO */
int dma_buffer_pos; /* The address for the next DMA descriptor */
int period_counter; /* for keeping track of periods transferred */
int sample_width;
int buffer_pos; /* current frame position in the buffer */
int running; /* 0=stopped, 1=running */
int uerr_num;
int oerr_num;
struct dma_chan *dma_ch;
int (*transfer)(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm);
};
struct rz_ssi_priv {
void __iomem *base;
struct platform_device *pdev;
struct reset_control *rstc;
struct device *dev;
struct clk *sfr_clk;
struct clk *clk;
phys_addr_t phys;
int irq_int;
int irq_tx;
int irq_rx;
int irq_rt;
spinlock_t lock;
/*
* The SSI supports full-duplex transmission and reception.
* However, if an error occurs, channel reset (both transmission
* and reception reset) is required.
* So it is better to use as half-duplex (playing and recording
* should be done on separate channels).
*/
struct rz_ssi_stream playback;
struct rz_ssi_stream capture;
/* clock */
unsigned long audio_mck;
unsigned long audio_clk_1;
unsigned long audio_clk_2;
bool lrckp_fsync_fall; /* LR clock polarity (SSICR.LRCKP) */
bool bckp_rise; /* Bit clock polarity (SSICR.BCKP) */
bool dma_rt;
/* Full duplex communication support */
struct {
unsigned int rate;
unsigned int channels;
unsigned int sample_width;
unsigned int sample_bits;
} hw_params_cache;
};
static void rz_ssi_dma_complete(void *data);
static void rz_ssi_reg_writel(struct rz_ssi_priv *priv, uint reg, u32 data)
{
writel(data, (priv->base + reg));
}
static u32 rz_ssi_reg_readl(struct rz_ssi_priv *priv, uint reg)
{
return readl(priv->base + reg);
}
static void rz_ssi_reg_mask_setl(struct rz_ssi_priv *priv, uint reg,
u32 bclr, u32 bset)
{
u32 val;
val = readl(priv->base + reg);
val = (val & ~bclr) | bset;
writel(val, (priv->base + reg));
}
static inline struct snd_soc_dai *
rz_ssi_get_dai(struct snd_pcm_substream *substream)
{
struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
return snd_soc_rtd_to_cpu(rtd, 0);
}
static inline bool rz_ssi_stream_is_play(struct rz_ssi_priv *ssi,
struct snd_pcm_substream *substream)
{
return substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
}
static inline struct rz_ssi_stream *
rz_ssi_stream_get(struct rz_ssi_priv *ssi, struct snd_pcm_substream *substream)
{
struct rz_ssi_stream *stream = &ssi->playback;
if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
stream = &ssi->capture;
return stream;
}
static inline bool rz_ssi_is_dma_enabled(struct rz_ssi_priv *ssi)
{
return (ssi->playback.dma_ch && (ssi->dma_rt || ssi->capture.dma_ch));
}
static void rz_ssi_set_substream(struct rz_ssi_stream *strm,
struct snd_pcm_substream *substream)
{
struct rz_ssi_priv *ssi = strm->priv;
unsigned long flags;
spin_lock_irqsave(&ssi->lock, flags);
strm->substream = substream;
spin_unlock_irqrestore(&ssi->lock, flags);
}
static bool rz_ssi_stream_is_valid(struct rz_ssi_priv *ssi,
struct rz_ssi_stream *strm)
{
unsigned long flags;
bool ret;
spin_lock_irqsave(&ssi->lock, flags);
ret = strm->substream && strm->substream->runtime;
spin_unlock_irqrestore(&ssi->lock, flags);
return ret;
}
static inline bool rz_ssi_is_stream_running(struct rz_ssi_stream *strm)
{
return strm->substream && strm->running;
}
static void rz_ssi_stream_init(struct rz_ssi_stream *strm,
struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
rz_ssi_set_substream(strm, substream);
strm->sample_width = samples_to_bytes(runtime, 1);
strm->dma_buffer_pos = 0;
strm->period_counter = 0;
strm->buffer_pos = 0;
strm->oerr_num = 0;
strm->uerr_num = 0;
strm->running = 0;
/* fifo init */
strm->fifo_sample_size = SSI_FIFO_DEPTH;
}
static void rz_ssi_stream_quit(struct rz_ssi_priv *ssi,
struct rz_ssi_stream *strm)
{
struct snd_soc_dai *dai = rz_ssi_get_dai(strm->substream);
rz_ssi_set_substream(strm, NULL);
if (strm->oerr_num > 0)
dev_info(dai->dev, "overrun = %d\n", strm->oerr_num);
if (strm->uerr_num > 0)
dev_info(dai->dev, "underrun = %d\n", strm->uerr_num);
}
static int rz_ssi_clk_setup(struct rz_ssi_priv *ssi, unsigned int rate,
unsigned int channels)
{
static s8 ckdv[16] = { 1, 2, 4, 8, 16, 32, 64, 128,
6, 12, 24, 48, 96, -1, -1, -1 };
unsigned int channel_bits = 32; /* System Word Length */
unsigned long bclk_rate = rate * channels * channel_bits;
unsigned int div;
unsigned int i;
u32 ssicr = 0;
u32 clk_ckdv;
/* Clear AUCKE so we can set MST */
rz_ssi_reg_writel(ssi, SSIFCR, 0);
/* Continue to output LRCK pin even when idle */
rz_ssi_reg_writel(ssi, SSIOFR, SSIOFR_LRCONT);
if (ssi->audio_clk_1 && ssi->audio_clk_2) {
if (ssi->audio_clk_1 % bclk_rate)
ssi->audio_mck = ssi->audio_clk_2;
else
ssi->audio_mck = ssi->audio_clk_1;
}
/* Clock setting */
ssicr |= SSICR_MST;
if (ssi->audio_mck == ssi->audio_clk_1)
ssicr |= SSICR_CKS;
if (ssi->bckp_rise)
ssicr |= SSICR_BCKP;
if (ssi->lrckp_fsync_fall)
ssicr |= SSICR_LRCKP;
/* Determine the clock divider */
clk_ckdv = 0;
div = ssi->audio_mck / bclk_rate;
/* try to find an match */
for (i = 0; i < ARRAY_SIZE(ckdv); i++) {
if (ckdv[i] == div) {
clk_ckdv = i;
break;
}
}
if (i == ARRAY_SIZE(ckdv)) {
dev_err(ssi->dev, "Rate not divisible by audio clock source\n");
return -EINVAL;
}
/*
* DWL: Data Word Length = 16 bits
* SWL: System Word Length = 32 bits
*/
ssicr |= SSICR_CKDV(clk_ckdv);
ssicr |= SSICR_DWL(1) | SSICR_SWL(3);
rz_ssi_reg_writel(ssi, SSICR, ssicr);
rz_ssi_reg_writel(ssi, SSIFCR,
(SSIFCR_AUCKE | SSIFCR_TFRST | SSIFCR_RFRST));
return 0;
}
static void rz_ssi_set_idle(struct rz_ssi_priv *ssi)
{
int timeout;
/* Disable irqs */
rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TUIEN | SSICR_TOIEN |
SSICR_RUIEN | SSICR_ROIEN, 0);
rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_TIE | SSIFCR_RIE, 0);
/* Clear all error flags */
rz_ssi_reg_mask_setl(ssi, SSISR,
(SSISR_TOIRQ | SSISR_TUIRQ | SSISR_ROIRQ |
SSISR_RUIRQ), 0);
/* Wait for idle */
timeout = 100;
while (--timeout) {
if (rz_ssi_reg_readl(ssi, SSISR) & SSISR_IIRQ)
break;
udelay(1);
}
if (!timeout)
dev_info(ssi->dev, "timeout waiting for SSI idle\n");
/* Hold FIFOs in reset */
rz_ssi_reg_mask_setl(ssi, SSIFCR, 0,
SSIFCR_TFRST | SSIFCR_RFRST);
}
static int rz_ssi_start(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
{
bool is_play = rz_ssi_stream_is_play(ssi, strm->substream);
bool is_full_duplex;
u32 ssicr, ssifcr;
is_full_duplex = rz_ssi_is_stream_running(&ssi->playback) ||
rz_ssi_is_stream_running(&ssi->capture);
ssicr = rz_ssi_reg_readl(ssi, SSICR);
ssifcr = rz_ssi_reg_readl(ssi, SSIFCR);
if (!is_full_duplex) {
ssifcr &= ~0xF;
} else {
rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TEN | SSICR_REN, 0);
rz_ssi_set_idle(ssi);
ssifcr &= ~SSIFCR_FIFO_RST;
}
/* FIFO interrupt thresholds */
if (rz_ssi_is_dma_enabled(ssi))
rz_ssi_reg_writel(ssi, SSISCR, 0);
else
rz_ssi_reg_writel(ssi, SSISCR,
SSISCR_TDES(strm->fifo_sample_size / 2 - 1) |
SSISCR_RDFS(0));
/* enable IRQ */
if (is_play) {
ssicr |= SSICR_TUIEN | SSICR_TOIEN;
ssifcr |= SSIFCR_TIE;
if (!is_full_duplex)
ssifcr |= SSIFCR_RFRST;
} else {
ssicr |= SSICR_RUIEN | SSICR_ROIEN;
ssifcr |= SSIFCR_RIE;
if (!is_full_duplex)
ssifcr |= SSIFCR_TFRST;
}
rz_ssi_reg_writel(ssi, SSICR, ssicr);
rz_ssi_reg_writel(ssi, SSIFCR, ssifcr);
/* Clear all error flags */
rz_ssi_reg_mask_setl(ssi, SSISR,
(SSISR_TOIRQ | SSISR_TUIRQ | SSISR_ROIRQ |
SSISR_RUIRQ), 0);
strm->running = 1;
if (is_full_duplex)
ssicr |= SSICR_TEN | SSICR_REN;
else
ssicr |= is_play ? SSICR_TEN : SSICR_REN;
rz_ssi_reg_writel(ssi, SSICR, ssicr);
return 0;
}
static int rz_ssi_stop(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
{
strm->running = 0;
if (rz_ssi_is_stream_running(&ssi->playback) ||
rz_ssi_is_stream_running(&ssi->capture))
return 0;
/* Disable TX/RX */
rz_ssi_reg_mask_setl(ssi, SSICR, SSICR_TEN | SSICR_REN, 0);
/* Cancel all remaining DMA transactions */
if (rz_ssi_is_dma_enabled(ssi))
dmaengine_terminate_async(strm->dma_ch);
rz_ssi_set_idle(ssi);
return 0;
}
static void rz_ssi_pointer_update(struct rz_ssi_stream *strm, int frames)
{
struct snd_pcm_substream *substream = strm->substream;
struct snd_pcm_runtime *runtime;
int current_period;
if (!strm->running || !substream || !substream->runtime)
return;
runtime = substream->runtime;
strm->buffer_pos += frames;
WARN_ON(strm->buffer_pos > runtime->buffer_size);
/* ring buffer */
if (strm->buffer_pos == runtime->buffer_size)
strm->buffer_pos = 0;
current_period = strm->buffer_pos / runtime->period_size;
if (strm->period_counter != current_period) {
snd_pcm_period_elapsed(strm->substream);
strm->period_counter = current_period;
}
}
static int rz_ssi_pio_recv(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
{
struct snd_pcm_substream *substream = strm->substream;
struct snd_pcm_runtime *runtime;
u16 *buf;
int fifo_samples;
int frames_left;
int samples;
int i;
if (!rz_ssi_stream_is_valid(ssi, strm))
return -EINVAL;
runtime = substream->runtime;
do {
/* frames left in this period */
frames_left = runtime->period_size -
(strm->buffer_pos % runtime->period_size);
if (!frames_left)
frames_left = runtime->period_size;
/* Samples in RX FIFO */
fifo_samples = (rz_ssi_reg_readl(ssi, SSIFSR) >>
SSIFSR_RDC_SHIFT) & SSIFSR_RDC_MASK;
/* Only read full frames at a time */
samples = 0;
while (frames_left && (fifo_samples >= runtime->channels)) {
samples += runtime->channels;
fifo_samples -= runtime->channels;
frames_left--;
}
/* not enough samples yet */
if (!samples)
break;
/* calculate new buffer index */
buf = (u16 *)runtime->dma_area;
buf += strm->buffer_pos * runtime->channels;
/* Note, only supports 16-bit samples */
for (i = 0; i < samples; i++)
*buf++ = (u16)(rz_ssi_reg_readl(ssi, SSIFRDR) >> 16);
rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0);
rz_ssi_pointer_update(strm, samples / runtime->channels);
} while (!frames_left && fifo_samples >= runtime->channels);
return 0;
}
static int rz_ssi_pio_send(struct rz_ssi_priv *ssi, struct rz_ssi_stream *strm)
{
struct snd_pcm_substream *substream = strm->substream;
struct snd_pcm_runtime *runtime = substream->runtime;
int sample_space;
int samples = 0;
int frames_left;
int i;
u32 ssifsr;
u16 *buf;
if (!rz_ssi_stream_is_valid(ssi, strm))
return -EINVAL;
/* frames left in this period */
frames_left = runtime->period_size - (strm->buffer_pos %
runtime->period_size);
if (frames_left == 0)
frames_left = runtime->period_size;
sample_space = strm->fifo_sample_size;
ssifsr = rz_ssi_reg_readl(ssi, SSIFSR);
sample_space -= (ssifsr >> SSIFSR_TDC_SHIFT) & SSIFSR_TDC_MASK;
/* Only add full frames at a time */
while (frames_left && (sample_space >= runtime->channels)) {
samples += runtime->channels;
sample_space -= runtime->channels;
frames_left--;
}
/* no space to send anything right now */
if (samples == 0)
return 0;
/* calculate new buffer index */
buf = (u16 *)(runtime->dma_area);
buf += strm->buffer_pos * runtime->channels;
/* Note, only supports 16-bit samples */
for (i = 0; i < samples; i++)
rz_ssi_reg_writel(ssi, SSIFTDR, ((u32)(*buf++) << 16));
rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_TDE, 0);
rz_ssi_pointer_update(strm, samples / runtime->channels);
return 0;
}
static irqreturn_t rz_ssi_interrupt(int irq, void *data)
{
struct rz_ssi_stream *strm_playback = NULL;
struct rz_ssi_stream *strm_capture = NULL;
struct rz_ssi_priv *ssi = data;
u32 ssisr = rz_ssi_reg_readl(ssi, SSISR);
if (ssi->playback.substream)
strm_playback = &ssi->playback;
if (ssi->capture.substream)
strm_capture = &ssi->capture;
if (!strm_playback && !strm_capture)
return IRQ_HANDLED; /* Left over TX/RX interrupt */
if (irq == ssi->irq_int) { /* error or idle */
bool is_stopped = false;
int i, count;
if (rz_ssi_is_dma_enabled(ssi))
count = 4;
else
count = 1;
if (ssisr & (SSISR_RUIRQ | SSISR_ROIRQ | SSISR_TUIRQ | SSISR_TOIRQ))
is_stopped = true;
if (ssi->capture.substream && is_stopped) {
if (ssisr & SSISR_RUIRQ)
strm_capture->uerr_num++;
if (ssisr & SSISR_ROIRQ)
strm_capture->oerr_num++;
rz_ssi_stop(ssi, strm_capture);
}
if (ssi->playback.substream && is_stopped) {
if (ssisr & SSISR_TUIRQ)
strm_playback->uerr_num++;
if (ssisr & SSISR_TOIRQ)
strm_playback->oerr_num++;
rz_ssi_stop(ssi, strm_playback);
}
/* Clear all flags */
rz_ssi_reg_mask_setl(ssi, SSISR, SSISR_TOIRQ | SSISR_TUIRQ |
SSISR_ROIRQ | SSISR_RUIRQ, 0);
/* Add/remove more data */
if (ssi->capture.substream && is_stopped) {
for (i = 0; i < count; i++)
strm_capture->transfer(ssi, strm_capture);
}
if (ssi->playback.substream && is_stopped) {
for (i = 0; i < count; i++)
strm_playback->transfer(ssi, strm_playback);
}
/* Resume */
if (ssi->playback.substream && is_stopped)
rz_ssi_start(ssi, &ssi->playback);
if (ssi->capture.substream && is_stopped)
rz_ssi_start(ssi, &ssi->capture);
}
if (!rz_ssi_is_stream_running(&ssi->playback) &&
!rz_ssi_is_stream_running(&ssi->capture))
return IRQ_HANDLED;
/* tx data empty */
if (irq == ssi->irq_tx && rz_ssi_is_stream_running(&ssi->playback))
strm_playback->transfer(ssi, &ssi->playback);
/* rx data full */
if (irq == ssi->irq_rx && rz_ssi_is_stream_running(&ssi->capture)) {
strm_capture->transfer(ssi, &ssi->capture);
rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0);
}
if (irq == ssi->irq_rt) {
if (ssi->playback.substream) {
strm_playback->transfer(ssi, &ssi->playback);
} else {
strm_capture->transfer(ssi, &ssi->capture);
rz_ssi_reg_mask_setl(ssi, SSIFSR, SSIFSR_RDF, 0);
}
}
return IRQ_HANDLED;
}
static int rz_ssi_dma_slave_config(struct rz_ssi_priv *ssi,
struct dma_chan *dma_ch, bool is_play)
{
struct dma_slave_config cfg;
memset(&cfg, 0, sizeof(cfg));
cfg.direction = is_play ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
cfg.dst_addr = ssi->phys + SSIFTDR;
cfg.src_addr = ssi->phys + SSIFRDR;
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
return dmaengine_slave_config(dma_ch, &cfg);
}
static int rz_ssi_dma_transfer(struct rz_ssi_priv *ssi,
struct rz_ssi_stream *strm)
{
struct snd_pcm_substream *substream = strm->substream;
struct dma_async_tx_descriptor *desc;
struct snd_pcm_runtime *runtime;
enum dma_transfer_direction dir;
u32 dma_paddr, dma_size;
int amount;
if (!rz_ssi_stream_is_valid(ssi, strm))
return -EINVAL;
runtime = substream->runtime;
if (runtime->state == SNDRV_PCM_STATE_DRAINING)
/*
* Stream is ending, so do not queue up any more DMA
* transfers otherwise we play partial sound clips
* because we can't shut off the DMA quick enough.
*/
return 0;
dir = rz_ssi_stream_is_play(ssi, substream) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;
/* Always transfer 1 period */
amount = runtime->period_size;
/* DMA physical address and size */
dma_paddr = runtime->dma_addr + frames_to_bytes(runtime,
strm->dma_buffer_pos);
dma_size = frames_to_bytes(runtime, amount);
desc = dmaengine_prep_slave_single(strm->dma_ch, dma_paddr, dma_size,
dir,
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
if (!desc) {
dev_err(ssi->dev, "dmaengine_prep_slave_single() fail\n");
return -ENOMEM;
}
desc->callback = rz_ssi_dma_complete;
desc->callback_param = strm;
if (dmaengine_submit(desc) < 0) {
dev_err(ssi->dev, "dmaengine_submit() fail\n");
return -EIO;
}
/* Update DMA pointer */
strm->dma_buffer_pos += amount;
if (strm->dma_buffer_pos >= runtime->buffer_size)
strm->dma_buffer_pos = 0;
/* Start DMA */
dma_async_issue_pending(strm->dma_ch);
return 0;
}
static void rz_ssi_dma_complete(void *data)
{
struct rz_ssi_stream *strm = (struct rz_ssi_stream *)data;
if (!strm->running || !strm->substream || !strm->substream->runtime)
return;
/* Note that next DMA transaction has probably already started */
rz_ssi_pointer_update(strm, strm->substream->runtime->period_size);
/* Queue up another DMA transaction */
rz_ssi_dma_transfer(strm->priv, strm);
}
static void rz_ssi_release_dma_channels(struct rz_ssi_priv *ssi)
{
if (ssi->playback.dma_ch) {
dma_release_channel(ssi->playback.dma_ch);
ssi->playback.dma_ch = NULL;
if (ssi->dma_rt)
ssi->dma_rt = false;
}
if (ssi->capture.dma_ch) {
dma_release_channel(ssi->capture.dma_ch);
ssi->capture.dma_ch = NULL;
}
}
static int rz_ssi_dma_request(struct rz_ssi_priv *ssi, struct device *dev)
{
ssi->playback.dma_ch = dma_request_chan(dev, "tx");
if (IS_ERR(ssi->playback.dma_ch))
ssi->playback.dma_ch = NULL;
ssi->capture.dma_ch = dma_request_chan(dev, "rx");
if (IS_ERR(ssi->capture.dma_ch))
ssi->capture.dma_ch = NULL;
if (!ssi->playback.dma_ch && !ssi->capture.dma_ch) {
ssi->playback.dma_ch = dma_request_chan(dev, "rt");
if (IS_ERR(ssi->playback.dma_ch)) {
ssi->playback.dma_ch = NULL;
goto no_dma;
}
ssi->dma_rt = true;
}
if (!rz_ssi_is_dma_enabled(ssi))
goto no_dma;
if (ssi->playback.dma_ch &&
(rz_ssi_dma_slave_config(ssi, ssi->playback.dma_ch, true) < 0))
goto no_dma;
if (ssi->capture.dma_ch &&
(rz_ssi_dma_slave_config(ssi, ssi->capture.dma_ch, false) < 0))
goto no_dma;
return 0;
no_dma:
rz_ssi_release_dma_channels(ssi);
return -ENODEV;
}
static int rz_ssi_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai);
struct rz_ssi_stream *strm = rz_ssi_stream_get(ssi, substream);
int ret = 0, i, num_transfer = 1;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
/* Soft Reset */
if (!rz_ssi_is_stream_running(&ssi->playback) &&
!rz_ssi_is_stream_running(&ssi->capture)) {
rz_ssi_reg_mask_setl(ssi, SSIFCR, 0, SSIFCR_SSIRST);
rz_ssi_reg_mask_setl(ssi, SSIFCR, SSIFCR_SSIRST, 0);
udelay(5);
}
rz_ssi_stream_init(strm, substream);
if (ssi->dma_rt) {
bool is_playback;
is_playback = rz_ssi_stream_is_play(ssi, substream);
ret = rz_ssi_dma_slave_config(ssi, ssi->playback.dma_ch,
is_playback);
/* Fallback to pio */
if (ret < 0) {
ssi->playback.transfer = rz_ssi_pio_send;
ssi->capture.transfer = rz_ssi_pio_recv;
rz_ssi_release_dma_channels(ssi);
}
}
/* For DMA, queue up multiple DMA descriptors */
if (rz_ssi_is_dma_enabled(ssi))
num_transfer = 4;
for (i = 0; i < num_transfer; i++) {
ret = strm->transfer(ssi, strm);
if (ret)
goto done;
}
ret = rz_ssi_start(ssi, strm);
break;
case SNDRV_PCM_TRIGGER_STOP:
rz_ssi_stop(ssi, strm);
rz_ssi_stream_quit(ssi, strm);
break;
}
done:
return ret;
}
static int rz_ssi_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai);
switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
case SND_SOC_DAIFMT_BP_FP:
break;
default:
dev_err(ssi->dev, "Codec should be clk and frame consumer\n");
return -EINVAL;
}
/*
* set clock polarity
*
* "normal" BCLK = Signal is available at rising edge of BCLK
* "normal" FSYNC = (I2S) Left ch starts with falling FSYNC edge
*/
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
ssi->bckp_rise = false;
ssi->lrckp_fsync_fall = false;
break;
case SND_SOC_DAIFMT_NB_IF:
ssi->bckp_rise = false;
ssi->lrckp_fsync_fall = true;
break;
case SND_SOC_DAIFMT_IB_NF:
ssi->bckp_rise = true;
ssi->lrckp_fsync_fall = false;
break;
case SND_SOC_DAIFMT_IB_IF:
ssi->bckp_rise = true;
ssi->lrckp_fsync_fall = true;
break;
default:
return -EINVAL;
}
/* only i2s support */
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
break;
default:
dev_err(ssi->dev, "Only I2S mode is supported.\n");
return -EINVAL;
}
return 0;
}
static bool rz_ssi_is_valid_hw_params(struct rz_ssi_priv *ssi, unsigned int rate,
unsigned int channels,
unsigned int sample_width,
unsigned int sample_bits)
{
if (ssi->hw_params_cache.rate != rate ||
ssi->hw_params_cache.channels != channels ||
ssi->hw_params_cache.sample_width != sample_width ||
ssi->hw_params_cache.sample_bits != sample_bits)
return false;
return true;
}
static void rz_ssi_cache_hw_params(struct rz_ssi_priv *ssi, unsigned int rate,
unsigned int channels,
unsigned int sample_width,
unsigned int sample_bits)
{
ssi->hw_params_cache.rate = rate;
ssi->hw_params_cache.channels = channels;
ssi->hw_params_cache.sample_width = sample_width;
ssi->hw_params_cache.sample_bits = sample_bits;
}
static int rz_ssi_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai);
struct rz_ssi_stream *strm = rz_ssi_stream_get(ssi, substream);
unsigned int sample_bits = hw_param_interval(params,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS)->min;
unsigned int channels = params_channels(params);
unsigned int rate = params_rate(params);
if (sample_bits != 16) {
dev_err(ssi->dev, "Unsupported sample width: %d\n",
sample_bits);
return -EINVAL;
}
if (channels != 2) {
dev_err(ssi->dev, "Number of channels not matched: %d\n",
channels);
return -EINVAL;
}
if (rz_ssi_is_stream_running(&ssi->playback) ||
rz_ssi_is_stream_running(&ssi->capture)) {
if (rz_ssi_is_valid_hw_params(ssi, rate, channels,
strm->sample_width, sample_bits))
return 0;
dev_err(ssi->dev, "Full duplex needs same HW params\n");
return -EINVAL;
}
rz_ssi_cache_hw_params(ssi, rate, channels, strm->sample_width,
sample_bits);
return rz_ssi_clk_setup(ssi, rate, channels);
}
static const struct snd_soc_dai_ops rz_ssi_dai_ops = {
.trigger = rz_ssi_dai_trigger,
.set_fmt = rz_ssi_dai_set_fmt,
.hw_params = rz_ssi_dai_hw_params,
};
static const struct snd_pcm_hardware rz_ssi_pcm_hardware = {
.info = SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID,
.buffer_bytes_max = PREALLOC_BUFFER,
.period_bytes_min = 32,
.period_bytes_max = 8192,
.channels_min = SSI_CHAN_MIN,
.channels_max = SSI_CHAN_MAX,
.periods_min = 1,
.periods_max = 32,
.fifo_size = 32 * 2,
};
static int rz_ssi_pcm_open(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
snd_soc_set_runtime_hwparams(substream, &rz_ssi_pcm_hardware);
return snd_pcm_hw_constraint_integer(substream->runtime,
SNDRV_PCM_HW_PARAM_PERIODS);
}
static snd_pcm_uframes_t rz_ssi_pcm_pointer(struct snd_soc_component *component,
struct snd_pcm_substream *substream)
{
struct snd_soc_dai *dai = rz_ssi_get_dai(substream);
struct rz_ssi_priv *ssi = snd_soc_dai_get_drvdata(dai);
struct rz_ssi_stream *strm = rz_ssi_stream_get(ssi, substream);
return strm->buffer_pos;
}
static int rz_ssi_pcm_new(struct snd_soc_component *component,
struct snd_soc_pcm_runtime *rtd)
{
snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
rtd->card->snd_card->dev,
PREALLOC_BUFFER, PREALLOC_BUFFER_MAX);
return 0;
}
static struct snd_soc_dai_driver rz_ssi_soc_dai[] = {
{
.name = "rz-ssi-dai",
.playback = {
.rates = SSI_RATES,
.formats = SSI_FMTS,
.channels_min = SSI_CHAN_MIN,
.channels_max = SSI_CHAN_MAX,
},
.capture = {
.rates = SSI_RATES,
.formats = SSI_FMTS,
.channels_min = SSI_CHAN_MIN,
.channels_max = SSI_CHAN_MAX,
},
.ops = &rz_ssi_dai_ops,
},
};
static const struct snd_soc_component_driver rz_ssi_soc_component = {
.name = "rz-ssi",
.open = rz_ssi_pcm_open,
.pointer = rz_ssi_pcm_pointer,
.pcm_construct = rz_ssi_pcm_new,
.legacy_dai_naming = 1,
};
static int rz_ssi_probe(struct platform_device *pdev)
{
struct rz_ssi_priv *ssi;
struct clk *audio_clk;
struct resource *res;
int ret;
ssi = devm_kzalloc(&pdev->dev, sizeof(*ssi), GFP_KERNEL);
if (!ssi)
return -ENOMEM;
ssi->pdev = pdev;
ssi->dev = &pdev->dev;
ssi->base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(ssi->base))
return PTR_ERR(ssi->base);
ssi->phys = res->start;
ssi->clk = devm_clk_get(&pdev->dev, "ssi");
if (IS_ERR(ssi->clk))
return PTR_ERR(ssi->clk);
ssi->sfr_clk = devm_clk_get(&pdev->dev, "ssi_sfr");
if (IS_ERR(ssi->sfr_clk))
return PTR_ERR(ssi->sfr_clk);
audio_clk = devm_clk_get(&pdev->dev, "audio_clk1");
if (IS_ERR(audio_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(audio_clk),
"no audio clk1");
ssi->audio_clk_1 = clk_get_rate(audio_clk);
audio_clk = devm_clk_get(&pdev->dev, "audio_clk2");
if (IS_ERR(audio_clk))
return dev_err_probe(&pdev->dev, PTR_ERR(audio_clk),
"no audio clk2");
ssi->audio_clk_2 = clk_get_rate(audio_clk);
if (!(ssi->audio_clk_1 || ssi->audio_clk_2))
return dev_err_probe(&pdev->dev, -EINVAL,
"no audio clk1 or audio clk2");
ssi->audio_mck = ssi->audio_clk_1 ? ssi->audio_clk_1 : ssi->audio_clk_2;
/* Detect DMA support */
ret = rz_ssi_dma_request(ssi, &pdev->dev);
if (ret < 0) {
dev_warn(&pdev->dev, "DMA not available, using PIO\n");
ssi->playback.transfer = rz_ssi_pio_send;
ssi->capture.transfer = rz_ssi_pio_recv;
} else {
dev_info(&pdev->dev, "DMA enabled");
ssi->playback.transfer = rz_ssi_dma_transfer;
ssi->capture.transfer = rz_ssi_dma_transfer;
}
ssi->playback.priv = ssi;
ssi->capture.priv = ssi;
spin_lock_init(&ssi->lock);
dev_set_drvdata(&pdev->dev, ssi);
/* Error Interrupt */
ssi->irq_int = platform_get_irq_byname(pdev, "int_req");
if (ssi->irq_int < 0) {
rz_ssi_release_dma_channels(ssi);
return ssi->irq_int;
}
ret = devm_request_irq(&pdev->dev, ssi->irq_int, &rz_ssi_interrupt,
0, dev_name(&pdev->dev), ssi);
if (ret < 0) {
rz_ssi_release_dma_channels(ssi);
return dev_err_probe(&pdev->dev, ret,
"irq request error (int_req)\n");
}
if (!rz_ssi_is_dma_enabled(ssi)) {
/* Tx and Rx interrupts (pio only) */
ssi->irq_tx = platform_get_irq_byname(pdev, "dma_tx");
ssi->irq_rx = platform_get_irq_byname(pdev, "dma_rx");
if (ssi->irq_tx == -ENXIO && ssi->irq_rx == -ENXIO) {
ssi->irq_rt = platform_get_irq_byname(pdev, "dma_rt");
if (ssi->irq_rt < 0)
return ssi->irq_rt;
ret = devm_request_irq(&pdev->dev, ssi->irq_rt,
&rz_ssi_interrupt, 0,
dev_name(&pdev->dev), ssi);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret,
"irq request error (dma_rt)\n");
} else {
if (ssi->irq_tx < 0)
return ssi->irq_tx;
if (ssi->irq_rx < 0)
return ssi->irq_rx;
ret = devm_request_irq(&pdev->dev, ssi->irq_tx,
&rz_ssi_interrupt, 0,
dev_name(&pdev->dev), ssi);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret,
"irq request error (dma_tx)\n");
ret = devm_request_irq(&pdev->dev, ssi->irq_rx,
&rz_ssi_interrupt, 0,
dev_name(&pdev->dev), ssi);
if (ret < 0)
return dev_err_probe(&pdev->dev, ret,
"irq request error (dma_rx)\n");
}
}
ssi->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
if (IS_ERR(ssi->rstc)) {
ret = PTR_ERR(ssi->rstc);
goto err_reset;
}
reset_control_deassert(ssi->rstc);
pm_runtime_enable(&pdev->dev);
ret = pm_runtime_resume_and_get(&pdev->dev);
if (ret < 0) {
dev_err(&pdev->dev, "pm_runtime_resume_and_get failed\n");
goto err_pm;
}
ret = devm_snd_soc_register_component(&pdev->dev, &rz_ssi_soc_component,
rz_ssi_soc_dai,
ARRAY_SIZE(rz_ssi_soc_dai));
if (ret < 0) {
dev_err(&pdev->dev, "failed to register snd component\n");
goto err_snd_soc;
}
return 0;
err_snd_soc:
pm_runtime_put(ssi->dev);
err_pm:
pm_runtime_disable(ssi->dev);
reset_control_assert(ssi->rstc);
err_reset:
rz_ssi_release_dma_channels(ssi);
return ret;
}
static void rz_ssi_remove(struct platform_device *pdev)
{
struct rz_ssi_priv *ssi = dev_get_drvdata(&pdev->dev);
rz_ssi_release_dma_channels(ssi);
pm_runtime_put(ssi->dev);
pm_runtime_disable(ssi->dev);
reset_control_assert(ssi->rstc);
}
static const struct of_device_id rz_ssi_of_match[] = {
{ .compatible = "renesas,rz-ssi", },
{/* Sentinel */},
};
MODULE_DEVICE_TABLE(of, rz_ssi_of_match);
static struct platform_driver rz_ssi_driver = {
.driver = {
.name = "rz-ssi-pcm-audio",
.of_match_table = rz_ssi_of_match,
},
.probe = rz_ssi_probe,
.remove = rz_ssi_remove,
};
module_platform_driver(rz_ssi_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Renesas RZ/G2L ASoC Serial Sound Interface Driver");
MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
|