summaryrefslogtreecommitdiffstats
path: root/sound/soc/stm/stm32_sai_sub.c
blob: f9297228c41ce4412f86d9ba7010ba714d44d345 (plain)
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
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
/*
 * STM32 ALSA SoC Digital Audio Interface (SAI) driver.
 *
 * Copyright (C) 2016, STMicroelectronics - All Rights Reserved
 * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
 *
 * License terms: GPL V2.0.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>

#include <sound/asoundef.h>
#include <sound/core.h>
#include <sound/dmaengine_pcm.h>
#include <sound/pcm_params.h>

#include "stm32_sai.h"

#define SAI_FREE_PROTOCOL	0x0
#define SAI_SPDIF_PROTOCOL	0x1

#define SAI_SLOT_SIZE_AUTO	0x0
#define SAI_SLOT_SIZE_16	0x1
#define SAI_SLOT_SIZE_32	0x2

#define SAI_DATASIZE_8		0x2
#define SAI_DATASIZE_10		0x3
#define SAI_DATASIZE_16		0x4
#define SAI_DATASIZE_20		0x5
#define SAI_DATASIZE_24		0x6
#define SAI_DATASIZE_32		0x7

#define STM_SAI_FIFO_SIZE	8
#define STM_SAI_DAI_NAME_SIZE	15

#define STM_SAI_IS_PLAYBACK(ip)	((ip)->dir == SNDRV_PCM_STREAM_PLAYBACK)
#define STM_SAI_IS_CAPTURE(ip)	((ip)->dir == SNDRV_PCM_STREAM_CAPTURE)

#define STM_SAI_A_ID		0x0
#define STM_SAI_B_ID		0x1

#define STM_SAI_IS_SUB_A(x)	((x)->id == STM_SAI_A_ID)
#define STM_SAI_IS_SUB_B(x)	((x)->id == STM_SAI_B_ID)
#define STM_SAI_BLOCK_NAME(x)	(((x)->id == STM_SAI_A_ID) ? "A" : "B")

#define SAI_SYNC_NONE		0x0
#define SAI_SYNC_INTERNAL	0x1
#define SAI_SYNC_EXTERNAL	0x2

#define STM_SAI_PROTOCOL_IS_SPDIF(ip)	((ip)->spdif)
#define STM_SAI_HAS_SPDIF(x)	((x)->pdata->conf->has_spdif)
#define STM_SAI_HAS_EXT_SYNC(x) (!STM_SAI_IS_F4(sai->pdata))

#define SAI_IEC60958_BLOCK_FRAMES	192
#define SAI_IEC60958_STATUS_BYTES	24

#define SAI_MCLK_NAME_LEN		32

/**
 * struct stm32_sai_sub_data - private data of SAI sub block (block A or B)
 * @pdev: device data pointer
 * @regmap: SAI register map pointer
 * @regmap_config: SAI sub block register map configuration pointer
 * @dma_params: dma configuration data for rx or tx channel
 * @cpu_dai_drv: DAI driver data pointer
 * @cpu_dai: DAI runtime data pointer
 * @substream: PCM substream data pointer
 * @pdata: SAI block parent data pointer
 * @np_sync_provider: synchronization provider node
 * @sai_ck: kernel clock feeding the SAI clock generator
 * @sai_mclk: master clock from SAI mclk provider
 * @phys_addr: SAI registers physical base address
 * @mclk_rate: SAI block master clock frequency (Hz). set at init
 * @id: SAI sub block id corresponding to sub-block A or B
 * @dir: SAI block direction (playback or capture). set at init
 * @master: SAI block mode flag. (true=master, false=slave) set at init
 * @spdif: SAI S/PDIF iec60958 mode flag. set at init
 * @fmt: SAI block format. relevant only for custom protocols. set at init
 * @sync: SAI block synchronization mode. (none, internal or external)
 * @synco: SAI block ext sync source (provider setting). (none, sub-block A/B)
 * @synci: SAI block ext sync source (client setting). (SAI sync provider index)
 * @fs_length: frame synchronization length. depends on protocol settings
 * @slots: rx or tx slot number
 * @slot_width: rx or tx slot width in bits
 * @slot_mask: rx or tx active slots mask. set at init or at runtime
 * @data_size: PCM data width. corresponds to PCM substream width.
 * @spdif_frm_cnt: S/PDIF playback frame counter
 * @snd_aes_iec958: iec958 data
 * @ctrl_lock: control lock
 */
struct stm32_sai_sub_data {
	struct platform_device *pdev;
	struct regmap *regmap;
	const struct regmap_config *regmap_config;
	struct snd_dmaengine_dai_dma_data dma_params;
	struct snd_soc_dai_driver *cpu_dai_drv;
	struct snd_soc_dai *cpu_dai;
	struct snd_pcm_substream *substream;
	struct stm32_sai_data *pdata;
	struct device_node *np_sync_provider;
	struct clk *sai_ck;
	struct clk *sai_mclk;
	dma_addr_t phys_addr;
	unsigned int mclk_rate;
	unsigned int id;
	int dir;
	bool master;
	bool spdif;
	int fmt;
	int sync;
	int synco;
	int synci;
	int fs_length;
	int slots;
	int slot_width;
	int slot_mask;
	int data_size;
	unsigned int spdif_frm_cnt;
	struct snd_aes_iec958 iec958;
	struct mutex ctrl_lock; /* protect resources accessed by controls */
};

enum stm32_sai_fifo_th {
	STM_SAI_FIFO_TH_EMPTY,
	STM_SAI_FIFO_TH_QUARTER,
	STM_SAI_FIFO_TH_HALF,
	STM_SAI_FIFO_TH_3_QUARTER,
	STM_SAI_FIFO_TH_FULL,
};

static bool stm32_sai_sub_readable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case STM_SAI_CR1_REGX:
	case STM_SAI_CR2_REGX:
	case STM_SAI_FRCR_REGX:
	case STM_SAI_SLOTR_REGX:
	case STM_SAI_IMR_REGX:
	case STM_SAI_SR_REGX:
	case STM_SAI_CLRFR_REGX:
	case STM_SAI_DR_REGX:
	case STM_SAI_PDMCR_REGX:
	case STM_SAI_PDMLY_REGX:
		return true;
	default:
		return false;
	}
}

static bool stm32_sai_sub_volatile_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case STM_SAI_DR_REGX:
		return true;
	default:
		return false;
	}
}

static bool stm32_sai_sub_writeable_reg(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case STM_SAI_CR1_REGX:
	case STM_SAI_CR2_REGX:
	case STM_SAI_FRCR_REGX:
	case STM_SAI_SLOTR_REGX:
	case STM_SAI_IMR_REGX:
	case STM_SAI_SR_REGX:
	case STM_SAI_CLRFR_REGX:
	case STM_SAI_DR_REGX:
	case STM_SAI_PDMCR_REGX:
	case STM_SAI_PDMLY_REGX:
		return true;
	default:
		return false;
	}
}

static const struct regmap_config stm32_sai_sub_regmap_config_f4 = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = STM_SAI_DR_REGX,
	.readable_reg = stm32_sai_sub_readable_reg,
	.volatile_reg = stm32_sai_sub_volatile_reg,
	.writeable_reg = stm32_sai_sub_writeable_reg,
	.fast_io = true,
};

static const struct regmap_config stm32_sai_sub_regmap_config_h7 = {
	.reg_bits = 32,
	.reg_stride = 4,
	.val_bits = 32,
	.max_register = STM_SAI_PDMLY_REGX,
	.readable_reg = stm32_sai_sub_readable_reg,
	.volatile_reg = stm32_sai_sub_volatile_reg,
	.writeable_reg = stm32_sai_sub_writeable_reg,
	.fast_io = true,
};

static int snd_pcm_iec958_info(struct snd_kcontrol *kcontrol,
			       struct snd_ctl_elem_info *uinfo)
{
	uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
	uinfo->count = 1;

	return 0;
}

static int snd_pcm_iec958_get(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *uctl)
{
	struct stm32_sai_sub_data *sai = snd_kcontrol_chip(kcontrol);

	mutex_lock(&sai->ctrl_lock);
	memcpy(uctl->value.iec958.status, sai->iec958.status, 4);
	mutex_unlock(&sai->ctrl_lock);

	return 0;
}

static int snd_pcm_iec958_put(struct snd_kcontrol *kcontrol,
			      struct snd_ctl_elem_value *uctl)
{
	struct stm32_sai_sub_data *sai = snd_kcontrol_chip(kcontrol);

	mutex_lock(&sai->ctrl_lock);
	memcpy(sai->iec958.status, uctl->value.iec958.status, 4);
	mutex_unlock(&sai->ctrl_lock);

	return 0;
}

static const struct snd_kcontrol_new iec958_ctls = {
	.access = (SNDRV_CTL_ELEM_ACCESS_READWRITE |
			SNDRV_CTL_ELEM_ACCESS_VOLATILE),
	.iface = SNDRV_CTL_ELEM_IFACE_PCM,
	.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
	.info = snd_pcm_iec958_info,
	.get = snd_pcm_iec958_get,
	.put = snd_pcm_iec958_put,
};

struct stm32_sai_mclk_data {
	struct clk_hw hw;
	unsigned long freq;
	struct stm32_sai_sub_data *sai_data;
};

#define to_mclk_data(_hw) container_of(_hw, struct stm32_sai_mclk_data, hw)
#define STM32_SAI_MAX_CLKS 1

static int stm32_sai_get_clk_div(struct stm32_sai_sub_data *sai,
				 unsigned long input_rate,
				 unsigned long output_rate)
{
	int version = sai->pdata->conf->version;
	int div;

	div = DIV_ROUND_CLOSEST(input_rate, output_rate);
	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
		return -EINVAL;
	}
	dev_dbg(&sai->pdev->dev, "SAI divider %d\n", div);

	if (input_rate % div)
		dev_dbg(&sai->pdev->dev,
			"Rate not accurate. requested (%ld), actual (%ld)\n",
			output_rate, input_rate / div);

	return div;
}

static int stm32_sai_set_clk_div(struct stm32_sai_sub_data *sai,
				 unsigned int div)
{
	int version = sai->pdata->conf->version;
	int ret, cr1, mask;

	if (div > SAI_XCR1_MCKDIV_MAX(version)) {
		dev_err(&sai->pdev->dev, "Divider %d out of range\n", div);
		return -EINVAL;
	}

	mask = SAI_XCR1_MCKDIV_MASK(SAI_XCR1_MCKDIV_WIDTH(version));
	cr1 = SAI_XCR1_MCKDIV_SET(div);
	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, mask, cr1);
	if (ret < 0)
		dev_err(&sai->pdev->dev, "Failed to update CR1 register\n");

	return ret;
}

static long stm32_sai_mclk_round_rate(struct clk_hw *hw, unsigned long rate,
				      unsigned long *prate)
{
	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
	struct stm32_sai_sub_data *sai = mclk->sai_data;
	int div;

	div = stm32_sai_get_clk_div(sai, *prate, rate);
	if (div < 0)
		return div;

	mclk->freq = *prate / div;

	return mclk->freq;
}

static unsigned long stm32_sai_mclk_recalc_rate(struct clk_hw *hw,
						unsigned long parent_rate)
{
	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);

	return mclk->freq;
}

static int stm32_sai_mclk_set_rate(struct clk_hw *hw, unsigned long rate,
				   unsigned long parent_rate)
{
	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
	struct stm32_sai_sub_data *sai = mclk->sai_data;
	int div, ret;

	div = stm32_sai_get_clk_div(sai, parent_rate, rate);
	if (div < 0)
		return div;

	ret = stm32_sai_set_clk_div(sai, div);
	if (ret)
		return ret;

	mclk->freq = rate;

	return 0;
}

static int stm32_sai_mclk_enable(struct clk_hw *hw)
{
	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
	struct stm32_sai_sub_data *sai = mclk->sai_data;

	dev_dbg(&sai->pdev->dev, "Enable master clock\n");

	return regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
				  SAI_XCR1_MCKEN, SAI_XCR1_MCKEN);
}

static void stm32_sai_mclk_disable(struct clk_hw *hw)
{
	struct stm32_sai_mclk_data *mclk = to_mclk_data(hw);
	struct stm32_sai_sub_data *sai = mclk->sai_data;

	dev_dbg(&sai->pdev->dev, "Disable master clock\n");

	regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, SAI_XCR1_MCKEN, 0);
}

static const struct clk_ops mclk_ops = {
	.enable = stm32_sai_mclk_enable,
	.disable = stm32_sai_mclk_disable,
	.recalc_rate = stm32_sai_mclk_recalc_rate,
	.round_rate = stm32_sai_mclk_round_rate,
	.set_rate = stm32_sai_mclk_set_rate,
};

static int stm32_sai_add_mclk_provider(struct stm32_sai_sub_data *sai)
{
	struct clk_hw *hw;
	struct stm32_sai_mclk_data *mclk;
	struct device *dev = &sai->pdev->dev;
	const char *pname = __clk_get_name(sai->sai_ck);
	char *mclk_name, *p, *s = (char *)pname;
	int ret, i = 0;

	mclk = devm_kzalloc(dev, sizeof(*mclk), GFP_KERNEL);
	if (!mclk)
		return -ENOMEM;

	mclk_name = devm_kcalloc(dev, sizeof(char),
				 SAI_MCLK_NAME_LEN, GFP_KERNEL);
	if (!mclk_name)
		return -ENOMEM;

	/*
	 * Forge mclk clock name from parent clock name and suffix.
	 * String after "_" char is stripped in parent name.
	 */
	p = mclk_name;
	while (*s && *s != '_' && (i < (SAI_MCLK_NAME_LEN - 7))) {
		*p++ = *s++;
		i++;
	}
	STM_SAI_IS_SUB_A(sai) ? strcat(p, "a_mclk") : strcat(p, "b_mclk");

	mclk->hw.init = CLK_HW_INIT(mclk_name, pname, &mclk_ops, 0);
	mclk->sai_data = sai;
	hw = &mclk->hw;

	dev_dbg(dev, "Register master clock %s\n", mclk_name);
	ret = devm_clk_hw_register(&sai->pdev->dev, hw);
	if (ret) {
		dev_err(dev, "mclk register returned %d\n", ret);
		return ret;
	}
	sai->sai_mclk = hw->clk;

	/* register mclk provider */
	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw);
}

static irqreturn_t stm32_sai_isr(int irq, void *devid)
{
	struct stm32_sai_sub_data *sai = (struct stm32_sai_sub_data *)devid;
	struct platform_device *pdev = sai->pdev;
	unsigned int sr, imr, flags;
	snd_pcm_state_t status = SNDRV_PCM_STATE_RUNNING;

	regmap_read(sai->regmap, STM_SAI_IMR_REGX, &imr);
	regmap_read(sai->regmap, STM_SAI_SR_REGX, &sr);

	flags = sr & imr;
	if (!flags)
		return IRQ_NONE;

	regmap_update_bits(sai->regmap, STM_SAI_CLRFR_REGX, SAI_XCLRFR_MASK,
			   SAI_XCLRFR_MASK);

	if (!sai->substream) {
		dev_err(&pdev->dev, "Device stopped. Spurious IRQ 0x%x\n", sr);
		return IRQ_NONE;
	}

	if (flags & SAI_XIMR_OVRUDRIE) {
		dev_err(&pdev->dev, "IRQ %s\n",
			STM_SAI_IS_PLAYBACK(sai) ? "underrun" : "overrun");
		status = SNDRV_PCM_STATE_XRUN;
	}

	if (flags & SAI_XIMR_MUTEDETIE)
		dev_dbg(&pdev->dev, "IRQ mute detected\n");

	if (flags & SAI_XIMR_WCKCFGIE) {
		dev_err(&pdev->dev, "IRQ wrong clock configuration\n");
		status = SNDRV_PCM_STATE_DISCONNECTED;
	}

	if (flags & SAI_XIMR_CNRDYIE)
		dev_err(&pdev->dev, "IRQ Codec not ready\n");

	if (flags & SAI_XIMR_AFSDETIE) {
		dev_err(&pdev->dev, "IRQ Anticipated frame synchro\n");
		status = SNDRV_PCM_STATE_XRUN;
	}

	if (flags & SAI_XIMR_LFSDETIE) {
		dev_err(&pdev->dev, "IRQ Late frame synchro\n");
		status = SNDRV_PCM_STATE_XRUN;
	}

	if (status != SNDRV_PCM_STATE_RUNNING)
		snd_pcm_stop_xrun(sai->substream);

	return IRQ_HANDLED;
}

static int stm32_sai_set_sysclk(struct snd_soc_dai *cpu_dai,
				int clk_id, unsigned int freq, int dir)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int ret;

	if (dir == SND_SOC_CLOCK_OUT) {
		ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
					 SAI_XCR1_NODIV,
					 (unsigned int)~SAI_XCR1_NODIV);
		if (ret < 0)
			return ret;

		dev_dbg(cpu_dai->dev, "SAI MCLK frequency is %uHz\n", freq);
		sai->mclk_rate = freq;

		if (sai->sai_mclk) {
			ret = clk_set_rate_exclusive(sai->sai_mclk,
						     sai->mclk_rate);
			if (ret) {
				dev_err(cpu_dai->dev,
					"Could not set mclk rate\n");
				return ret;
			}
		}
	}

	return 0;
}

static int stm32_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
				      u32 rx_mask, int slots, int slot_width)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int slotr, slotr_mask, slot_size;

	if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
		dev_warn(cpu_dai->dev, "Slot setting relevant only for TDM\n");
		return 0;
	}

	dev_dbg(cpu_dai->dev, "Masks tx/rx:%#x/%#x, slots:%d, width:%d\n",
		tx_mask, rx_mask, slots, slot_width);

	switch (slot_width) {
	case 16:
		slot_size = SAI_SLOT_SIZE_16;
		break;
	case 32:
		slot_size = SAI_SLOT_SIZE_32;
		break;
	default:
		slot_size = SAI_SLOT_SIZE_AUTO;
		break;
	}

	slotr = SAI_XSLOTR_SLOTSZ_SET(slot_size) |
		SAI_XSLOTR_NBSLOT_SET(slots - 1);
	slotr_mask = SAI_XSLOTR_SLOTSZ_MASK | SAI_XSLOTR_NBSLOT_MASK;

	/* tx/rx mask set in machine init, if slot number defined in DT */
	if (STM_SAI_IS_PLAYBACK(sai)) {
		sai->slot_mask = tx_mask;
		slotr |= SAI_XSLOTR_SLOTEN_SET(tx_mask);
	}

	if (STM_SAI_IS_CAPTURE(sai)) {
		sai->slot_mask = rx_mask;
		slotr |= SAI_XSLOTR_SLOTEN_SET(rx_mask);
	}

	slotr_mask |= SAI_XSLOTR_SLOTEN_MASK;

	regmap_update_bits(sai->regmap, STM_SAI_SLOTR_REGX, slotr_mask, slotr);

	sai->slot_width = slot_width;
	sai->slots = slots;

	return 0;
}

static int stm32_sai_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int cr1, frcr = 0;
	int cr1_mask, frcr_mask = 0;
	int ret;

	dev_dbg(cpu_dai->dev, "fmt %x\n", fmt);

	/* Do not generate master by default */
	cr1 = SAI_XCR1_NODIV;
	cr1_mask = SAI_XCR1_NODIV;

	cr1_mask |= SAI_XCR1_PRTCFG_MASK;
	if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
		cr1 |= SAI_XCR1_PRTCFG_SET(SAI_SPDIF_PROTOCOL);
		goto conf_update;
	}

	cr1 |= SAI_XCR1_PRTCFG_SET(SAI_FREE_PROTOCOL);

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	/* SCK active high for all protocols */
	case SND_SOC_DAIFMT_I2S:
		cr1 |= SAI_XCR1_CKSTR;
		frcr |= SAI_XFRCR_FSOFF | SAI_XFRCR_FSDEF;
		break;
	/* Left justified */
	case SND_SOC_DAIFMT_MSB:
		frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF;
		break;
	/* Right justified */
	case SND_SOC_DAIFMT_LSB:
		frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSDEF;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		frcr |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSOFF;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		frcr |= SAI_XFRCR_FSPOL;
		break;
	default:
		dev_err(cpu_dai->dev, "Unsupported protocol %#x\n",
			fmt & SND_SOC_DAIFMT_FORMAT_MASK);
		return -EINVAL;
	}

	cr1_mask |= SAI_XCR1_CKSTR;
	frcr_mask |= SAI_XFRCR_FSPOL | SAI_XFRCR_FSOFF |
		     SAI_XFRCR_FSDEF;

	/* DAI clock strobing. Invert setting previously set */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	case SND_SOC_DAIFMT_IB_NF:
		cr1 ^= SAI_XCR1_CKSTR;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		frcr ^= SAI_XFRCR_FSPOL;
		break;
	case SND_SOC_DAIFMT_IB_IF:
		/* Invert fs & sck */
		cr1 ^= SAI_XCR1_CKSTR;
		frcr ^= SAI_XFRCR_FSPOL;
		break;
	default:
		dev_err(cpu_dai->dev, "Unsupported strobing %#x\n",
			fmt & SND_SOC_DAIFMT_INV_MASK);
		return -EINVAL;
	}
	cr1_mask |= SAI_XCR1_CKSTR;
	frcr_mask |= SAI_XFRCR_FSPOL;

	regmap_update_bits(sai->regmap, STM_SAI_FRCR_REGX, frcr_mask, frcr);

	/* DAI clock master masks */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		/* codec is master */
		cr1 |= SAI_XCR1_SLAVE;
		sai->master = false;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		sai->master = true;
		break;
	default:
		dev_err(cpu_dai->dev, "Unsupported mode %#x\n",
			fmt & SND_SOC_DAIFMT_MASTER_MASK);
		return -EINVAL;
	}

	/* Set slave mode if sub-block is synchronized with another SAI */
	if (sai->sync) {
		dev_dbg(cpu_dai->dev, "Synchronized SAI configured as slave\n");
		cr1 |= SAI_XCR1_SLAVE;
		sai->master = false;
	}

	cr1_mask |= SAI_XCR1_SLAVE;

conf_update:
	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, cr1_mask, cr1);
	if (ret < 0) {
		dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
		return ret;
	}

	sai->fmt = fmt;

	return 0;
}

static int stm32_sai_startup(struct snd_pcm_substream *substream,
			     struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int imr, cr2, ret;

	sai->substream = substream;

	ret = clk_prepare_enable(sai->sai_ck);
	if (ret < 0) {
		dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret);
		return ret;
	}

	/* Enable ITs */

	regmap_update_bits(sai->regmap, STM_SAI_CLRFR_REGX,
			   SAI_XCLRFR_MASK, SAI_XCLRFR_MASK);

	imr = SAI_XIMR_OVRUDRIE;
	if (STM_SAI_IS_CAPTURE(sai)) {
		regmap_read(sai->regmap, STM_SAI_CR2_REGX, &cr2);
		if (cr2 & SAI_XCR2_MUTECNT_MASK)
			imr |= SAI_XIMR_MUTEDETIE;
	}

	if (sai->master)
		imr |= SAI_XIMR_WCKCFGIE;
	else
		imr |= SAI_XIMR_AFSDETIE | SAI_XIMR_LFSDETIE;

	regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX,
			   SAI_XIMR_MASK, imr);

	return 0;
}

static int stm32_sai_set_config(struct snd_soc_dai *cpu_dai,
				struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int cr1, cr1_mask, ret;

	/*
	 * DMA bursts increment is set to 4 words.
	 * SAI fifo threshold is set to half fifo, to keep enough space
	 * for DMA incoming bursts.
	 */
	regmap_update_bits(sai->regmap, STM_SAI_CR2_REGX,
			   SAI_XCR2_FFLUSH | SAI_XCR2_FTH_MASK,
			   SAI_XCR2_FFLUSH |
			   SAI_XCR2_FTH_SET(STM_SAI_FIFO_TH_HALF));

	/* DS bits in CR1 not set for SPDIF (size forced to 24 bits).*/
	if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
		sai->spdif_frm_cnt = 0;
		return 0;
	}

	/* Mode, data format and channel config */
	cr1_mask = SAI_XCR1_DS_MASK;
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		cr1 = SAI_XCR1_DS_SET(SAI_DATASIZE_8);
		break;
	case SNDRV_PCM_FORMAT_S16_LE:
		cr1 = SAI_XCR1_DS_SET(SAI_DATASIZE_16);
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		cr1 = SAI_XCR1_DS_SET(SAI_DATASIZE_32);
		break;
	default:
		dev_err(cpu_dai->dev, "Data format not supported");
		return -EINVAL;
	}

	cr1_mask |= SAI_XCR1_MONO;
	if ((sai->slots == 2) && (params_channels(params) == 1))
		cr1 |= SAI_XCR1_MONO;

	ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, cr1_mask, cr1);
	if (ret < 0) {
		dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
		return ret;
	}

	return 0;
}

static int stm32_sai_set_slots(struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int slotr, slot_sz;

	regmap_read(sai->regmap, STM_SAI_SLOTR_REGX, &slotr);

	/*
	 * If SLOTSZ is set to auto in SLOTR, align slot width on data size
	 * By default slot width = data size, if not forced from DT
	 */
	slot_sz = slotr & SAI_XSLOTR_SLOTSZ_MASK;
	if (slot_sz == SAI_XSLOTR_SLOTSZ_SET(SAI_SLOT_SIZE_AUTO))
		sai->slot_width = sai->data_size;

	if (sai->slot_width < sai->data_size) {
		dev_err(cpu_dai->dev,
			"Data size %d larger than slot width\n",
			sai->data_size);
		return -EINVAL;
	}

	/* Slot number is set to 2, if not specified in DT */
	if (!sai->slots)
		sai->slots = 2;

	/* The number of slots in the audio frame is equal to NBSLOT[3:0] + 1*/
	regmap_update_bits(sai->regmap, STM_SAI_SLOTR_REGX,
			   SAI_XSLOTR_NBSLOT_MASK,
			   SAI_XSLOTR_NBSLOT_SET((sai->slots - 1)));

	/* Set default slots mask if not already set from DT */
	if (!(slotr & SAI_XSLOTR_SLOTEN_MASK)) {
		sai->slot_mask = (1 << sai->slots) - 1;
		regmap_update_bits(sai->regmap,
				   STM_SAI_SLOTR_REGX, SAI_XSLOTR_SLOTEN_MASK,
				   SAI_XSLOTR_SLOTEN_SET(sai->slot_mask));
	}

	dev_dbg(cpu_dai->dev, "Slots %d, slot width %d\n",
		sai->slots, sai->slot_width);

	return 0;
}

static void stm32_sai_set_frame(struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int fs_active, offset, format;
	int frcr, frcr_mask;

	format = sai->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
	sai->fs_length = sai->slot_width * sai->slots;

	fs_active = sai->fs_length / 2;
	if ((format == SND_SOC_DAIFMT_DSP_A) ||
	    (format == SND_SOC_DAIFMT_DSP_B))
		fs_active = 1;

	frcr = SAI_XFRCR_FRL_SET((sai->fs_length - 1));
	frcr |= SAI_XFRCR_FSALL_SET((fs_active - 1));
	frcr_mask = SAI_XFRCR_FRL_MASK | SAI_XFRCR_FSALL_MASK;

	dev_dbg(cpu_dai->dev, "Frame length %d, frame active %d\n",
		sai->fs_length, fs_active);

	regmap_update_bits(sai->regmap, STM_SAI_FRCR_REGX, frcr_mask, frcr);

	if ((sai->fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_LSB) {
		offset = sai->slot_width - sai->data_size;

		regmap_update_bits(sai->regmap, STM_SAI_SLOTR_REGX,
				   SAI_XSLOTR_FBOFF_MASK,
				   SAI_XSLOTR_FBOFF_SET(offset));
	}
}

static void stm32_sai_init_iec958_status(struct stm32_sai_sub_data *sai)
{
	unsigned char *cs = sai->iec958.status;

	cs[0] = IEC958_AES0_CON_NOT_COPYRIGHT | IEC958_AES0_CON_EMPHASIS_NONE;
	cs[1] = IEC958_AES1_CON_GENERAL;
	cs[2] = IEC958_AES2_CON_SOURCE_UNSPEC | IEC958_AES2_CON_CHANNEL_UNSPEC;
	cs[3] = IEC958_AES3_CON_CLOCK_1000PPM | IEC958_AES3_CON_FS_NOTID;
}

static void stm32_sai_set_iec958_status(struct stm32_sai_sub_data *sai,
					struct snd_pcm_runtime *runtime)
{
	if (!runtime)
		return;

	/* Force the sample rate according to runtime rate */
	mutex_lock(&sai->ctrl_lock);
	switch (runtime->rate) {
	case 22050:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_22050;
		break;
	case 44100:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_44100;
		break;
	case 88200:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_88200;
		break;
	case 176400:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_176400;
		break;
	case 24000:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_24000;
		break;
	case 48000:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_48000;
		break;
	case 96000:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_96000;
		break;
	case 192000:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_192000;
		break;
	case 32000:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_32000;
		break;
	default:
		sai->iec958.status[3] = IEC958_AES3_CON_FS_NOTID;
		break;
	}
	mutex_unlock(&sai->ctrl_lock);
}

static int stm32_sai_configure_clock(struct snd_soc_dai *cpu_dai,
				     struct snd_pcm_hw_params *params)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int div = 0;
	int sai_clk_rate, mclk_ratio, den;
	unsigned int rate = params_rate(params);

	if (!(rate % 11025))
		clk_set_parent(sai->sai_ck, sai->pdata->clk_x11k);
	else
		clk_set_parent(sai->sai_ck, sai->pdata->clk_x8k);
	sai_clk_rate = clk_get_rate(sai->sai_ck);

	if (STM_SAI_IS_F4(sai->pdata)) {
		/* mclk on (NODIV=0)
		 *   mclk_rate = 256 * fs
		 *   MCKDIV = 0 if sai_ck < 3/2 * mclk_rate
		 *   MCKDIV = sai_ck / (2 * mclk_rate) otherwise
		 * mclk off (NODIV=1)
		 *   MCKDIV ignored. sck = sai_ck
		 */
		if (!sai->mclk_rate)
			return 0;

		if (2 * sai_clk_rate >= 3 * sai->mclk_rate) {
			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
						    2 * sai->mclk_rate);
			if (div < 0)
				return div;
		}
	} else {
		/*
		 * TDM mode :
		 *   mclk on
		 *      MCKDIV = sai_ck / (ws x 256)	(NOMCK=0. OSR=0)
		 *      MCKDIV = sai_ck / (ws x 512)	(NOMCK=0. OSR=1)
		 *   mclk off
		 *      MCKDIV = sai_ck / (frl x ws)	(NOMCK=1)
		 * Note: NOMCK/NODIV correspond to same bit.
		 */
		if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
			div = stm32_sai_get_clk_div(sai, sai_clk_rate,
						    rate * 128);
			if (div < 0)
				return div;
		} else {
			if (sai->mclk_rate) {
				mclk_ratio = sai->mclk_rate / rate;
				if ((mclk_ratio != 512) &&
				    (mclk_ratio != 256)) {
					dev_err(cpu_dai->dev,
						"Wrong mclk ratio %d\n",
						mclk_ratio);
					return -EINVAL;
				}
				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
							    sai->mclk_rate);
				if (div < 0)
					return div;
			} else {
				/* mclk-fs not set, master clock not active */
				den = sai->fs_length * params_rate(params);
				div = stm32_sai_get_clk_div(sai, sai_clk_rate,
							    den);
				if (div < 0)
					return div;
			}
		}
	}

	return stm32_sai_set_clk_div(sai, div);
}

static int stm32_sai_hw_params(struct snd_pcm_substream *substream,
			       struct snd_pcm_hw_params *params,
			       struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int ret;

	sai->data_size = params_width(params);

	if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
		/* Rate not already set in runtime structure */
		substream->runtime->rate = params_rate(params);
		stm32_sai_set_iec958_status(sai, substream->runtime);
	} else {
		ret = stm32_sai_set_slots(cpu_dai);
		if (ret < 0)
			return ret;
		stm32_sai_set_frame(cpu_dai);
	}

	ret = stm32_sai_set_config(cpu_dai, substream, params);
	if (ret)
		return ret;

	if (sai->master)
		ret = stm32_sai_configure_clock(cpu_dai, params);

	return ret;
}

static int stm32_sai_trigger(struct snd_pcm_substream *substream, int cmd,
			     struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);
	int ret;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
		dev_dbg(cpu_dai->dev, "Enable DMA and SAI\n");

		regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
				   SAI_XCR1_DMAEN, SAI_XCR1_DMAEN);

		/* Enable SAI */
		ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
					 SAI_XCR1_SAIEN, SAI_XCR1_SAIEN);
		if (ret < 0)
			dev_err(cpu_dai->dev, "Failed to update CR1 register\n");
		break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_STOP:
		dev_dbg(cpu_dai->dev, "Disable DMA and SAI\n");

		regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX,
				   SAI_XIMR_MASK, 0);

		regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
				   SAI_XCR1_SAIEN,
				   (unsigned int)~SAI_XCR1_SAIEN);

		ret = regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX,
					 SAI_XCR1_DMAEN,
					 (unsigned int)~SAI_XCR1_DMAEN);
		if (ret < 0)
			dev_err(cpu_dai->dev, "Failed to update CR1 register\n");

		if (STM_SAI_PROTOCOL_IS_SPDIF(sai))
			sai->spdif_frm_cnt = 0;
		break;
	default:
		return -EINVAL;
	}

	return ret;
}

static void stm32_sai_shutdown(struct snd_pcm_substream *substream,
			       struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = snd_soc_dai_get_drvdata(cpu_dai);

	regmap_update_bits(sai->regmap, STM_SAI_IMR_REGX, SAI_XIMR_MASK, 0);

	regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, SAI_XCR1_NODIV,
			   SAI_XCR1_NODIV);

	clk_disable_unprepare(sai->sai_ck);

	clk_rate_exclusive_put(sai->sai_mclk);

	sai->substream = NULL;
}

static int stm32_sai_pcm_new(struct snd_soc_pcm_runtime *rtd,
			     struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);

	if (STM_SAI_PROTOCOL_IS_SPDIF(sai)) {
		dev_dbg(&sai->pdev->dev, "%s: register iec controls", __func__);
		return snd_ctl_add(rtd->pcm->card,
				   snd_ctl_new1(&iec958_ctls, sai));
	}

	return 0;
}

static int stm32_sai_dai_probe(struct snd_soc_dai *cpu_dai)
{
	struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
	int cr1 = 0, cr1_mask;

	sai->cpu_dai = cpu_dai;

	sai->dma_params.addr = (dma_addr_t)(sai->phys_addr + STM_SAI_DR_REGX);
	/*
	 * DMA supports 4, 8 or 16 burst sizes. Burst size 4 is the best choice,
	 * as it allows bytes, half-word and words transfers. (See DMA fifos
	 * constraints).
	 */
	sai->dma_params.maxburst = 4;
	/* Buswidth will be set by framework at runtime */
	sai->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;

	if (STM_SAI_IS_PLAYBACK(sai))
		snd_soc_dai_init_dma_data(cpu_dai, &sai->dma_params, NULL);
	else
		snd_soc_dai_init_dma_data(cpu_dai, NULL, &sai->dma_params);

	/* Next settings are not relevant for spdif mode */
	if (STM_SAI_PROTOCOL_IS_SPDIF(sai))
		return 0;

	cr1_mask = SAI_XCR1_RX_TX;
	if (STM_SAI_IS_CAPTURE(sai))
		cr1 |= SAI_XCR1_RX_TX;

	/* Configure synchronization */
	if (sai->sync == SAI_SYNC_EXTERNAL) {
		/* Configure synchro client and provider */
		sai->pdata->set_sync(sai->pdata, sai->np_sync_provider,
				     sai->synco, sai->synci);
	}

	cr1_mask |= SAI_XCR1_SYNCEN_MASK;
	cr1 |= SAI_XCR1_SYNCEN_SET(sai->sync);

	return regmap_update_bits(sai->regmap, STM_SAI_CR1_REGX, cr1_mask, cr1);
}

static const struct snd_soc_dai_ops stm32_sai_pcm_dai_ops = {
	.set_sysclk	= stm32_sai_set_sysclk,
	.set_fmt	= stm32_sai_set_dai_fmt,
	.set_tdm_slot	= stm32_sai_set_dai_tdm_slot,
	.startup	= stm32_sai_startup,
	.hw_params	= stm32_sai_hw_params,
	.trigger	= stm32_sai_trigger,
	.shutdown	= stm32_sai_shutdown,
};

static int stm32_sai_pcm_process_spdif(struct snd_pcm_substream *substream,
				       int channel, unsigned long hwoff,
				       void *buf, unsigned long bytes)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
	struct stm32_sai_sub_data *sai = dev_get_drvdata(cpu_dai->dev);
	int *ptr = (int *)(runtime->dma_area + hwoff +
			   channel * (runtime->dma_bytes / runtime->channels));
	ssize_t cnt = bytes_to_samples(runtime, bytes);
	unsigned int frm_cnt = sai->spdif_frm_cnt;
	unsigned int byte;
	unsigned int mask;

	do {
		*ptr = ((*ptr >> 8) & 0x00ffffff);

		/* Set channel status bit */
		byte = frm_cnt >> 3;
		mask = 1 << (frm_cnt - (byte << 3));
		if (sai->iec958.status[byte] & mask)
			*ptr |= 0x04000000;
		ptr++;

		if (!(cnt % 2))
			frm_cnt++;

		if (frm_cnt == SAI_IEC60958_BLOCK_FRAMES)
			frm_cnt = 0;
	} while (--cnt);
	sai->spdif_frm_cnt = frm_cnt;

	return 0;
}

static const struct snd_pcm_hardware stm32_sai_pcm_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
	.buffer_bytes_max = 8 * PAGE_SIZE,
	.period_bytes_min = 1024, /* 5ms at 48kHz */
	.period_bytes_max = PAGE_SIZE,
	.periods_min = 2,
	.periods_max = 8,
};

static struct snd_soc_dai_driver stm32_sai_playback_dai[] = {
{
		.probe = stm32_sai_dai_probe,
		.pcm_new = stm32_sai_pcm_new,
		.id = 1, /* avoid call to fmt_single_name() */
		.playback = {
			.channels_min = 1,
			.channels_max = 2,
			.rate_min = 8000,
			.rate_max = 192000,
			.rates = SNDRV_PCM_RATE_CONTINUOUS,
			/* DMA does not support 24 bits transfers */
			.formats =
				SNDRV_PCM_FMTBIT_S8 |
				SNDRV_PCM_FMTBIT_S16_LE |
				SNDRV_PCM_FMTBIT_S32_LE,
		},
		.ops = &stm32_sai_pcm_dai_ops,
	}
};

static struct snd_soc_dai_driver stm32_sai_capture_dai[] = {
{
		.probe = stm32_sai_dai_probe,
		.id = 1, /* avoid call to fmt_single_name() */
		.capture = {
			.channels_min = 1,
			.channels_max = 2,
			.rate_min = 8000,
			.rate_max = 192000,
			.rates = SNDRV_PCM_RATE_CONTINUOUS,
			/* DMA does not support 24 bits transfers */
			.formats =
				SNDRV_PCM_FMTBIT_S8 |
				SNDRV_PCM_FMTBIT_S16_LE |
				SNDRV_PCM_FMTBIT_S32_LE,
		},
		.ops = &stm32_sai_pcm_dai_ops,
	}
};

static const struct snd_dmaengine_pcm_config stm32_sai_pcm_config = {
	.pcm_hardware = &stm32_sai_pcm_hw,
	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
};

static const struct snd_dmaengine_pcm_config stm32_sai_pcm_config_spdif = {
	.pcm_hardware = &stm32_sai_pcm_hw,
	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
	.process = stm32_sai_pcm_process_spdif,
};

static const struct snd_soc_component_driver stm32_component = {
	.name = "stm32-sai",
};

static const struct of_device_id stm32_sai_sub_ids[] = {
	{ .compatible = "st,stm32-sai-sub-a",
	  .data = (void *)STM_SAI_A_ID},
	{ .compatible = "st,stm32-sai-sub-b",
	  .data = (void *)STM_SAI_B_ID},
	{}
};
MODULE_DEVICE_TABLE(of, stm32_sai_sub_ids);

static int stm32_sai_sub_parse_of(struct platform_device *pdev,
				  struct stm32_sai_sub_data *sai)
{
	struct device_node *np = pdev->dev.of_node;
	struct resource *res;
	void __iomem *base;
	struct of_phandle_args args;
	int ret;

	if (!np)
		return -ENODEV;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(base))
		return PTR_ERR(base);

	sai->phys_addr = res->start;

	sai->regmap_config = &stm32_sai_sub_regmap_config_f4;
	/* Note: PDM registers not available for H7 sub-block B */
	if (STM_SAI_IS_H7(sai->pdata) && STM_SAI_IS_SUB_A(sai))
		sai->regmap_config = &stm32_sai_sub_regmap_config_h7;

	sai->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "sai_ck",
						base, sai->regmap_config);
	if (IS_ERR(sai->regmap)) {
		dev_err(&pdev->dev, "Failed to initialize MMIO\n");
		return PTR_ERR(sai->regmap);
	}

	/* Get direction property */
	if (of_property_match_string(np, "dma-names", "tx") >= 0) {
		sai->dir = SNDRV_PCM_STREAM_PLAYBACK;
	} else if (of_property_match_string(np, "dma-names", "rx") >= 0) {
		sai->dir = SNDRV_PCM_STREAM_CAPTURE;
	} else {
		dev_err(&pdev->dev, "Unsupported direction\n");
		return -EINVAL;
	}

	/* Get spdif iec60958 property */
	sai->spdif = false;
	if (of_get_property(np, "st,iec60958", NULL)) {
		if (!STM_SAI_HAS_SPDIF(sai) ||
		    sai->dir == SNDRV_PCM_STREAM_CAPTURE) {
			dev_err(&pdev->dev, "S/PDIF IEC60958 not supported\n");
			return -EINVAL;
		}
		stm32_sai_init_iec958_status(sai);
		sai->spdif = true;
		sai->master = true;
	}

	/* Get synchronization property */
	args.np = NULL;
	ret = of_parse_phandle_with_fixed_args(np, "st,sync", 1, 0, &args);
	if (ret < 0  && ret != -ENOENT) {
		dev_err(&pdev->dev, "Failed to get st,sync property\n");
		return ret;
	}

	sai->sync = SAI_SYNC_NONE;
	if (args.np) {
		if (args.np == np) {
			dev_err(&pdev->dev, "%pOFn sync own reference\n", np);
			of_node_put(args.np);
			return -EINVAL;
		}

		sai->np_sync_provider  = of_get_parent(args.np);
		if (!sai->np_sync_provider) {
			dev_err(&pdev->dev, "%pOFn parent node not found\n",
				np);
			of_node_put(args.np);
			return -ENODEV;
		}

		sai->sync = SAI_SYNC_INTERNAL;
		if (sai->np_sync_provider != sai->pdata->pdev->dev.of_node) {
			if (!STM_SAI_HAS_EXT_SYNC(sai)) {
				dev_err(&pdev->dev,
					"External synchro not supported\n");
				of_node_put(args.np);
				return -EINVAL;
			}
			sai->sync = SAI_SYNC_EXTERNAL;

			sai->synci = args.args[0];
			if (sai->synci < 1 ||
			    (sai->synci > (SAI_GCR_SYNCIN_MAX + 1))) {
				dev_err(&pdev->dev, "Wrong SAI index\n");
				of_node_put(args.np);
				return -EINVAL;
			}

			if (of_property_match_string(args.np, "compatible",
						     "st,stm32-sai-sub-a") >= 0)
				sai->synco = STM_SAI_SYNC_OUT_A;

			if (of_property_match_string(args.np, "compatible",
						     "st,stm32-sai-sub-b") >= 0)
				sai->synco = STM_SAI_SYNC_OUT_B;

			if (!sai->synco) {
				dev_err(&pdev->dev, "Unknown SAI sub-block\n");
				of_node_put(args.np);
				return -EINVAL;
			}
		}

		dev_dbg(&pdev->dev, "%s synchronized with %s\n",
			pdev->name, args.np->full_name);
	}

	of_node_put(args.np);
	sai->sai_ck = devm_clk_get(&pdev->dev, "sai_ck");
	if (IS_ERR(sai->sai_ck)) {
		dev_err(&pdev->dev, "Missing kernel clock sai_ck\n");
		return PTR_ERR(sai->sai_ck);
	}

	if (STM_SAI_IS_F4(sai->pdata))
		return 0;

	/* Register mclk provider if requested */
	if (of_find_property(np, "#clock-cells", NULL)) {
		ret = stm32_sai_add_mclk_provider(sai);
		if (ret < 0)
			return ret;
	} else {
		sai->sai_mclk = devm_clk_get(&pdev->dev, "MCLK");
		if (IS_ERR(sai->sai_mclk)) {
			if (PTR_ERR(sai->sai_mclk) != -ENOENT)
				return PTR_ERR(sai->sai_mclk);
			sai->sai_mclk = NULL;
		}
	}

	return 0;
}

static int stm32_sai_sub_dais_init(struct platform_device *pdev,
				   struct stm32_sai_sub_data *sai)
{
	sai->cpu_dai_drv = devm_kzalloc(&pdev->dev,
					sizeof(struct snd_soc_dai_driver),
					GFP_KERNEL);
	if (!sai->cpu_dai_drv)
		return -ENOMEM;

	sai->cpu_dai_drv->name = dev_name(&pdev->dev);
	if (STM_SAI_IS_PLAYBACK(sai)) {
		memcpy(sai->cpu_dai_drv, &stm32_sai_playback_dai,
		       sizeof(stm32_sai_playback_dai));
		sai->cpu_dai_drv->playback.stream_name = sai->cpu_dai_drv->name;
	} else {
		memcpy(sai->cpu_dai_drv, &stm32_sai_capture_dai,
		       sizeof(stm32_sai_capture_dai));
		sai->cpu_dai_drv->capture.stream_name = sai->cpu_dai_drv->name;
	}

	return 0;
}

static int stm32_sai_sub_probe(struct platform_device *pdev)
{
	struct stm32_sai_sub_data *sai;
	const struct of_device_id *of_id;
	const struct snd_dmaengine_pcm_config *conf = &stm32_sai_pcm_config;
	int ret;

	sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);
	if (!sai)
		return -ENOMEM;

	of_id = of_match_device(stm32_sai_sub_ids, &pdev->dev);
	if (!of_id)
		return -EINVAL;
	sai->id = (uintptr_t)of_id->data;

	sai->pdev = pdev;
	mutex_init(&sai->ctrl_lock);
	platform_set_drvdata(pdev, sai);

	sai->pdata = dev_get_drvdata(pdev->dev.parent);
	if (!sai->pdata) {
		dev_err(&pdev->dev, "Parent device data not available\n");
		return -EINVAL;
	}

	ret = stm32_sai_sub_parse_of(pdev, sai);
	if (ret)
		return ret;

	ret = stm32_sai_sub_dais_init(pdev, sai);
	if (ret)
		return ret;

	ret = devm_request_irq(&pdev->dev, sai->pdata->irq, stm32_sai_isr,
			       IRQF_SHARED, dev_name(&pdev->dev), sai);
	if (ret) {
		dev_err(&pdev->dev, "IRQ request returned %d\n", ret);
		return ret;
	}

	ret = devm_snd_soc_register_component(&pdev->dev, &stm32_component,
					      sai->cpu_dai_drv, 1);
	if (ret)
		return ret;

	if (STM_SAI_PROTOCOL_IS_SPDIF(sai))
		conf = &stm32_sai_pcm_config_spdif;

	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, conf, 0);
	if (ret) {
		dev_err(&pdev->dev, "Could not register pcm dma\n");
		return ret;
	}

	return 0;
}

static struct platform_driver stm32_sai_sub_driver = {
	.driver = {
		.name = "st,stm32-sai-sub",
		.of_match_table = stm32_sai_sub_ids,
	},
	.probe = stm32_sai_sub_probe,
};

module_platform_driver(stm32_sai_sub_driver);

MODULE_DESCRIPTION("STM32 Soc SAI sub-block Interface");
MODULE_AUTHOR("Olivier Moysan <olivier.moysan@st.com>");
MODULE_ALIAS("platform:st,stm32-sai-sub");
MODULE_LICENSE("GPL v2");