summaryrefslogtreecommitdiff
path: root/drivers/soundwire/cadence_master.c
blob: 4fcc3ba93004ad3c6ca93cabb59868a2c386dc1c (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
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.

/*
 * Cadence SoundWire Master module
 * Used by Master driver
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/debugfs.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/pm_runtime.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <linux/workqueue.h>
#include "bus.h"
#include "cadence_master.h"

static int interrupt_mask;
module_param_named(cnds_mcp_int_mask, interrupt_mask, int, 0444);
MODULE_PARM_DESC(cdns_mcp_int_mask, "Cadence MCP IntMask");

#define CDNS_MCP_CONFIG				0x0

#define CDNS_MCP_CONFIG_MCMD_RETRY		GENMASK(27, 24)
#define CDNS_MCP_CONFIG_MPREQ_DELAY		GENMASK(20, 16)
#define CDNS_MCP_CONFIG_MMASTER			BIT(7)
#define CDNS_MCP_CONFIG_BUS_REL			BIT(6)
#define CDNS_MCP_CONFIG_SNIFFER			BIT(5)
#define CDNS_MCP_CONFIG_SSPMOD			BIT(4)
#define CDNS_MCP_CONFIG_CMD			BIT(3)
#define CDNS_MCP_CONFIG_OP			GENMASK(2, 0)
#define CDNS_MCP_CONFIG_OP_NORMAL		0

#define CDNS_MCP_CONTROL			0x4

#define CDNS_MCP_CONTROL_RST_DELAY		GENMASK(10, 8)
#define CDNS_MCP_CONTROL_CMD_RST		BIT(7)
#define CDNS_MCP_CONTROL_SOFT_RST		BIT(6)
#define CDNS_MCP_CONTROL_SW_RST			BIT(5)
#define CDNS_MCP_CONTROL_HW_RST			BIT(4)
#define CDNS_MCP_CONTROL_CLK_PAUSE		BIT(3)
#define CDNS_MCP_CONTROL_CLK_STOP_CLR		BIT(2)
#define CDNS_MCP_CONTROL_CMD_ACCEPT		BIT(1)
#define CDNS_MCP_CONTROL_BLOCK_WAKEUP		BIT(0)

#define CDNS_MCP_CMDCTRL			0x8

#define CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR	BIT(2)

#define CDNS_MCP_SSPSTAT			0xC
#define CDNS_MCP_FRAME_SHAPE			0x10
#define CDNS_MCP_FRAME_SHAPE_INIT		0x14
#define CDNS_MCP_FRAME_SHAPE_COL_MASK		GENMASK(2, 0)
#define CDNS_MCP_FRAME_SHAPE_ROW_MASK		GENMASK(7, 3)

#define CDNS_MCP_CONFIG_UPDATE			0x18
#define CDNS_MCP_CONFIG_UPDATE_BIT		BIT(0)

#define CDNS_MCP_PHYCTRL			0x1C
#define CDNS_MCP_SSP_CTRL0			0x20
#define CDNS_MCP_SSP_CTRL1			0x28
#define CDNS_MCP_CLK_CTRL0			0x30
#define CDNS_MCP_CLK_CTRL1			0x38
#define CDNS_MCP_CLK_MCLKD_MASK		GENMASK(7, 0)

#define CDNS_MCP_STAT				0x40

#define CDNS_MCP_STAT_ACTIVE_BANK		BIT(20)
#define CDNS_MCP_STAT_CLK_STOP			BIT(16)

#define CDNS_MCP_INTSTAT			0x44
#define CDNS_MCP_INTMASK			0x48

#define CDNS_MCP_INT_IRQ			BIT(31)
#define CDNS_MCP_INT_RESERVED1			GENMASK(30, 17)
#define CDNS_MCP_INT_WAKEUP			BIT(16)
#define CDNS_MCP_INT_SLAVE_RSVD			BIT(15)
#define CDNS_MCP_INT_SLAVE_ALERT		BIT(14)
#define CDNS_MCP_INT_SLAVE_ATTACH		BIT(13)
#define CDNS_MCP_INT_SLAVE_NATTACH		BIT(12)
#define CDNS_MCP_INT_SLAVE_MASK			GENMASK(15, 12)
#define CDNS_MCP_INT_DPINT			BIT(11)
#define CDNS_MCP_INT_CTRL_CLASH			BIT(10)
#define CDNS_MCP_INT_DATA_CLASH			BIT(9)
#define CDNS_MCP_INT_PARITY			BIT(8)
#define CDNS_MCP_INT_CMD_ERR			BIT(7)
#define CDNS_MCP_INT_RESERVED2			GENMASK(6, 4)
#define CDNS_MCP_INT_RX_NE			BIT(3)
#define CDNS_MCP_INT_RX_WL			BIT(2)
#define CDNS_MCP_INT_TXE			BIT(1)
#define CDNS_MCP_INT_TXF			BIT(0)
#define CDNS_MCP_INT_RESERVED (CDNS_MCP_INT_RESERVED1 | CDNS_MCP_INT_RESERVED2)

#define CDNS_MCP_INTSET				0x4C

#define CDNS_MCP_SLAVE_STAT			0x50
#define CDNS_MCP_SLAVE_STAT_MASK		GENMASK(1, 0)

#define CDNS_MCP_SLAVE_INTSTAT0			0x54
#define CDNS_MCP_SLAVE_INTSTAT1			0x58
#define CDNS_MCP_SLAVE_INTSTAT_NPRESENT		BIT(0)
#define CDNS_MCP_SLAVE_INTSTAT_ATTACHED		BIT(1)
#define CDNS_MCP_SLAVE_INTSTAT_ALERT		BIT(2)
#define CDNS_MCP_SLAVE_INTSTAT_RESERVED		BIT(3)
#define CDNS_MCP_SLAVE_STATUS_BITS		GENMASK(3, 0)
#define CDNS_MCP_SLAVE_STATUS_NUM		4

#define CDNS_MCP_SLAVE_INTMASK0			0x5C
#define CDNS_MCP_SLAVE_INTMASK1			0x60

#define CDNS_MCP_SLAVE_INTMASK0_MASK		GENMASK(31, 0)
#define CDNS_MCP_SLAVE_INTMASK1_MASK		GENMASK(15, 0)

#define CDNS_MCP_PORT_INTSTAT			0x64
#define CDNS_MCP_PDI_STAT			0x6C

#define CDNS_MCP_FIFOLEVEL			0x78
#define CDNS_MCP_FIFOSTAT			0x7C
#define CDNS_MCP_RX_FIFO_AVAIL			GENMASK(5, 0)

#define CDNS_MCP_CMD_BASE			0x80
#define CDNS_MCP_RESP_BASE			0x80
#define CDNS_MCP_CMD_LEN			0x20
#define CDNS_MCP_CMD_WORD_LEN			0x4

#define CDNS_MCP_CMD_SSP_TAG			BIT(31)
#define CDNS_MCP_CMD_COMMAND			GENMASK(30, 28)
#define CDNS_MCP_CMD_DEV_ADDR			GENMASK(27, 24)
#define CDNS_MCP_CMD_REG_ADDR			GENMASK(23, 8)
#define CDNS_MCP_CMD_REG_DATA			GENMASK(7, 0)

#define CDNS_MCP_CMD_READ			2
#define CDNS_MCP_CMD_WRITE			3

#define CDNS_MCP_RESP_RDATA			GENMASK(15, 8)
#define CDNS_MCP_RESP_ACK			BIT(0)
#define CDNS_MCP_RESP_NACK			BIT(1)

#define CDNS_DP_SIZE				128

#define CDNS_DPN_B0_CONFIG(n)			(0x100 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_CH_EN(n)			(0x104 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_SAMPLE_CTRL(n)		(0x108 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_OFFSET_CTRL(n)		(0x10C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_HCTRL(n)			(0x110 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B0_ASYNC_CTRL(n)		(0x114 + CDNS_DP_SIZE * (n))

#define CDNS_DPN_B1_CONFIG(n)			(0x118 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_CH_EN(n)			(0x11C + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_SAMPLE_CTRL(n)		(0x120 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_OFFSET_CTRL(n)		(0x124 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_HCTRL(n)			(0x128 + CDNS_DP_SIZE * (n))
#define CDNS_DPN_B1_ASYNC_CTRL(n)		(0x12C + CDNS_DP_SIZE * (n))

#define CDNS_DPN_CONFIG_BPM			BIT(18)
#define CDNS_DPN_CONFIG_BGC			GENMASK(17, 16)
#define CDNS_DPN_CONFIG_WL			GENMASK(12, 8)
#define CDNS_DPN_CONFIG_PORT_DAT		GENMASK(3, 2)
#define CDNS_DPN_CONFIG_PORT_FLOW		GENMASK(1, 0)

#define CDNS_DPN_SAMPLE_CTRL_SI			GENMASK(15, 0)

#define CDNS_DPN_OFFSET_CTRL_1			GENMASK(7, 0)
#define CDNS_DPN_OFFSET_CTRL_2			GENMASK(15, 8)

#define CDNS_DPN_HCTRL_HSTOP			GENMASK(3, 0)
#define CDNS_DPN_HCTRL_HSTART			GENMASK(7, 4)
#define CDNS_DPN_HCTRL_LCTRL			GENMASK(10, 8)

#define CDNS_PORTCTRL				0x130
#define CDNS_PORTCTRL_TEST_FAILED		BIT(1)
#define CDNS_PORTCTRL_DIRN			BIT(7)
#define CDNS_PORTCTRL_BANK_INVERT		BIT(8)

#define CDNS_PORT_OFFSET			0x80

#define CDNS_PDI_CONFIG(n)			(0x1100 + (n) * 16)

#define CDNS_PDI_CONFIG_SOFT_RESET		BIT(24)
#define CDNS_PDI_CONFIG_CHANNEL			GENMASK(15, 8)
#define CDNS_PDI_CONFIG_PORT			GENMASK(4, 0)

/* Driver defaults */
#define CDNS_TX_TIMEOUT				500

#define CDNS_SCP_RX_FIFOLEVEL			0x2

/*
 * register accessor helpers
 */
static inline u32 cdns_readl(struct sdw_cdns *cdns, int offset)
{
	return readl(cdns->registers + offset);
}

static inline void cdns_writel(struct sdw_cdns *cdns, int offset, u32 value)
{
	writel(value, cdns->registers + offset);
}

static inline void cdns_updatel(struct sdw_cdns *cdns,
				int offset, u32 mask, u32 val)
{
	u32 tmp;

	tmp = cdns_readl(cdns, offset);
	tmp = (tmp & ~mask) | val;
	cdns_writel(cdns, offset, tmp);
}

static int cdns_set_wait(struct sdw_cdns *cdns, int offset, u32 mask, u32 value)
{
	int timeout = 10;
	u32 reg_read;

	/* Wait for bit to be set */
	do {
		reg_read = readl(cdns->registers + offset);
		if ((reg_read & mask) == value)
			return 0;

		timeout--;
		usleep_range(50, 100);
	} while (timeout != 0);

	return -ETIMEDOUT;
}

static int cdns_clear_bit(struct sdw_cdns *cdns, int offset, u32 value)
{
	writel(value, cdns->registers + offset);

	/* Wait for bit to be self cleared */
	return cdns_set_wait(cdns, offset, value, 0);
}

/*
 * all changes to the MCP_CONFIG, MCP_CONTROL, MCP_CMDCTRL and MCP_PHYCTRL
 * need to be confirmed with a write to MCP_CONFIG_UPDATE
 */
static int cdns_config_update(struct sdw_cdns *cdns)
{
	int ret;

	if (sdw_cdns_is_clock_stop(cdns)) {
		dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
		return -EINVAL;
	}

	ret = cdns_clear_bit(cdns, CDNS_MCP_CONFIG_UPDATE,
			     CDNS_MCP_CONFIG_UPDATE_BIT);
	if (ret < 0)
		dev_err(cdns->dev, "Config update timedout\n");

	return ret;
}

/*
 * debugfs
 */
#ifdef CONFIG_DEBUG_FS

#define RD_BUF (2 * PAGE_SIZE)

static ssize_t cdns_sprintf(struct sdw_cdns *cdns,
			    char *buf, size_t pos, unsigned int reg)
{
	return scnprintf(buf + pos, RD_BUF - pos,
			 "%4x\t%8x\n", reg, cdns_readl(cdns, reg));
}

static int cdns_reg_show(struct seq_file *s, void *data)
{
	struct sdw_cdns *cdns = s->private;
	char *buf;
	ssize_t ret;
	int num_ports;
	int i, j;

	buf = kzalloc(RD_BUF, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ret = scnprintf(buf, RD_BUF, "Register  Value\n");
	ret += scnprintf(buf + ret, RD_BUF - ret, "\nMCP Registers\n");
	/* 8 MCP registers */
	for (i = CDNS_MCP_CONFIG; i <= CDNS_MCP_PHYCTRL; i += sizeof(u32))
		ret += cdns_sprintf(cdns, buf, ret, i);

	ret += scnprintf(buf + ret, RD_BUF - ret,
			 "\nStatus & Intr Registers\n");
	/* 13 Status & Intr registers (offsets 0x70 and 0x74 not defined) */
	for (i = CDNS_MCP_STAT; i <=  CDNS_MCP_FIFOSTAT; i += sizeof(u32))
		ret += cdns_sprintf(cdns, buf, ret, i);

	ret += scnprintf(buf + ret, RD_BUF - ret,
			 "\nSSP & Clk ctrl Registers\n");
	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL0);
	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_SSP_CTRL1);
	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL0);
	ret += cdns_sprintf(cdns, buf, ret, CDNS_MCP_CLK_CTRL1);

	ret += scnprintf(buf + ret, RD_BUF - ret,
			 "\nDPn B0 Registers\n");

	num_ports = cdns->num_ports;

	for (i = 0; i < num_ports; i++) {
		ret += scnprintf(buf + ret, RD_BUF - ret,
				 "\nDP-%d\n", i);
		for (j = CDNS_DPN_B0_CONFIG(i);
		     j < CDNS_DPN_B0_ASYNC_CTRL(i); j += sizeof(u32))
			ret += cdns_sprintf(cdns, buf, ret, j);
	}

	ret += scnprintf(buf + ret, RD_BUF - ret,
			 "\nDPn B1 Registers\n");
	for (i = 0; i < num_ports; i++) {
		ret += scnprintf(buf + ret, RD_BUF - ret,
				 "\nDP-%d\n", i);

		for (j = CDNS_DPN_B1_CONFIG(i);
		     j < CDNS_DPN_B1_ASYNC_CTRL(i); j += sizeof(u32))
			ret += cdns_sprintf(cdns, buf, ret, j);
	}

	ret += scnprintf(buf + ret, RD_BUF - ret,
			 "\nDPn Control Registers\n");
	for (i = 0; i < num_ports; i++)
		ret += cdns_sprintf(cdns, buf, ret,
				CDNS_PORTCTRL + i * CDNS_PORT_OFFSET);

	ret += scnprintf(buf + ret, RD_BUF - ret,
			 "\nPDIn Config Registers\n");

	/* number of PDI and ports is interchangeable */
	for (i = 0; i < num_ports; i++)
		ret += cdns_sprintf(cdns, buf, ret, CDNS_PDI_CONFIG(i));

	seq_printf(s, "%s", buf);
	kfree(buf);

	return 0;
}
DEFINE_SHOW_ATTRIBUTE(cdns_reg);

static int cdns_hw_reset(void *data, u64 value)
{
	struct sdw_cdns *cdns = data;
	int ret;

	if (value != 1)
		return -EINVAL;

	/* Userspace changed the hardware state behind the kernel's back */
	add_taint(TAINT_USER, LOCKDEP_STILL_OK);

	ret = sdw_cdns_exit_reset(cdns);

	dev_dbg(cdns->dev, "link hw_reset done: %d\n", ret);

	return ret;
}

DEFINE_DEBUGFS_ATTRIBUTE(cdns_hw_reset_fops, NULL, cdns_hw_reset, "%llu\n");

static int cdns_parity_error_injection(void *data, u64 value)
{
	struct sdw_cdns *cdns = data;
	struct sdw_bus *bus;
	int ret;

	if (value != 1)
		return -EINVAL;

	bus = &cdns->bus;

	/*
	 * Resume Master device. If this results in a bus reset, the
	 * Slave devices will re-attach and be re-enumerated.
	 */
	ret = pm_runtime_get_sync(bus->dev);
	if (ret < 0 && ret != -EACCES) {
		dev_err_ratelimited(cdns->dev,
				    "pm_runtime_get_sync failed in %s, ret %d\n",
				    __func__, ret);
		pm_runtime_put_noidle(bus->dev);
		return ret;
	}

	/*
	 * wait long enough for Slave(s) to be in steady state. This
	 * does not need to be super precise.
	 */
	msleep(200);

	/*
	 * Take the bus lock here to make sure that any bus transactions
	 * will be queued while we inject a parity error on a dummy read
	 */
	mutex_lock(&bus->bus_lock);

	/* program hardware to inject parity error */
	cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
		     CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
		     CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR);

	/* commit changes */
	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
		     CDNS_MCP_CONFIG_UPDATE_BIT,
		     CDNS_MCP_CONFIG_UPDATE_BIT);

	/* do a broadcast dummy read to avoid bus clashes */
	ret = sdw_bread_no_pm_unlocked(&cdns->bus, 0xf, SDW_SCP_DEVID_0);
	dev_info(cdns->dev, "parity error injection, read: %d\n", ret);

	/* program hardware to disable parity error */
	cdns_updatel(cdns, CDNS_MCP_CMDCTRL,
		     CDNS_MCP_CMDCTRL_INSERT_PARITY_ERR,
		     0);

	/* commit changes */
	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
		     CDNS_MCP_CONFIG_UPDATE_BIT,
		     CDNS_MCP_CONFIG_UPDATE_BIT);

	/* Continue bus operation with parity error injection disabled */
	mutex_unlock(&bus->bus_lock);

	/* Userspace changed the hardware state behind the kernel's back */
	add_taint(TAINT_USER, LOCKDEP_STILL_OK);

	/*
	 * allow Master device to enter pm_runtime suspend. This may
	 * also result in Slave devices suspending.
	 */
	pm_runtime_mark_last_busy(bus->dev);
	pm_runtime_put_autosuspend(bus->dev);

	return 0;
}

DEFINE_DEBUGFS_ATTRIBUTE(cdns_parity_error_fops, NULL,
			 cdns_parity_error_injection, "%llu\n");

static int cdns_set_pdi_loopback_source(void *data, u64 value)
{
	struct sdw_cdns *cdns = data;
	unsigned int pdi_out_num = cdns->pcm.num_bd + cdns->pcm.num_out;

	if (value > pdi_out_num)
		return -EINVAL;

	/* Userspace changed the hardware state behind the kernel's back */
	add_taint(TAINT_USER, LOCKDEP_STILL_OK);

	cdns->pdi_loopback_source = value;

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_source_fops, NULL, cdns_set_pdi_loopback_source, "%llu\n");

static int cdns_set_pdi_loopback_target(void *data, u64 value)
{
	struct sdw_cdns *cdns = data;
	unsigned int pdi_in_num = cdns->pcm.num_bd + cdns->pcm.num_in;

	if (value > pdi_in_num)
		return -EINVAL;

	/* Userspace changed the hardware state behind the kernel's back */
	add_taint(TAINT_USER, LOCKDEP_STILL_OK);

	cdns->pdi_loopback_target = value;

	return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(cdns_pdi_loopback_target_fops, NULL, cdns_set_pdi_loopback_target, "%llu\n");

/**
 * sdw_cdns_debugfs_init() - Cadence debugfs init
 * @cdns: Cadence instance
 * @root: debugfs root
 */
void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root)
{
	debugfs_create_file("cdns-registers", 0400, root, cdns, &cdns_reg_fops);

	debugfs_create_file("cdns-hw-reset", 0200, root, cdns,
			    &cdns_hw_reset_fops);

	debugfs_create_file("cdns-parity-error-injection", 0200, root, cdns,
			    &cdns_parity_error_fops);

	cdns->pdi_loopback_source = -1;
	cdns->pdi_loopback_target = -1;

	debugfs_create_file("cdns-pdi-loopback-source", 0200, root, cdns,
			    &cdns_pdi_loopback_source_fops);

	debugfs_create_file("cdns-pdi-loopback-target", 0200, root, cdns,
			    &cdns_pdi_loopback_target_fops);

}
EXPORT_SYMBOL_GPL(sdw_cdns_debugfs_init);

#endif /* CONFIG_DEBUG_FS */

/*
 * IO Calls
 */
static enum sdw_command_response
cdns_fill_msg_resp(struct sdw_cdns *cdns,
		   struct sdw_msg *msg, int count, int offset)
{
	int nack = 0, no_ack = 0;
	int i;

	/* check message response */
	for (i = 0; i < count; i++) {
		if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
			no_ack = 1;
			dev_vdbg(cdns->dev, "Msg Ack not received, cmd %d\n", i);
		}
		if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
			nack = 1;
			dev_err_ratelimited(cdns->dev, "Msg NACK received, cmd %d\n", i);
		}
	}

	if (nack) {
		dev_err_ratelimited(cdns->dev, "Msg NACKed for Slave %d\n", msg->dev_num);
		return SDW_CMD_FAIL;
	}

	if (no_ack) {
		dev_dbg_ratelimited(cdns->dev, "Msg ignored for Slave %d\n", msg->dev_num);
		return SDW_CMD_IGNORED;
	}

	/* fill response */
	for (i = 0; i < count; i++)
		msg->buf[i + offset] = FIELD_GET(CDNS_MCP_RESP_RDATA, cdns->response_buf[i]);

	return SDW_CMD_OK;
}

static enum sdw_command_response
_cdns_xfer_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int cmd,
	       int offset, int count, bool defer)
{
	unsigned long time;
	u32 base, i, data;
	u16 addr;

	/* Program the watermark level for RX FIFO */
	if (cdns->msg_count != count) {
		cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, count);
		cdns->msg_count = count;
	}

	base = CDNS_MCP_CMD_BASE;
	addr = msg->addr;

	for (i = 0; i < count; i++) {
		data = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
		data |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, cmd);
		data |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, addr);
		addr++;

		if (msg->flags == SDW_MSG_FLAG_WRITE)
			data |= msg->buf[i + offset];

		data |= FIELD_PREP(CDNS_MCP_CMD_SSP_TAG, msg->ssp_sync);
		cdns_writel(cdns, base, data);
		base += CDNS_MCP_CMD_WORD_LEN;
	}

	if (defer)
		return SDW_CMD_OK;

	/* wait for timeout or response */
	time = wait_for_completion_timeout(&cdns->tx_complete,
					   msecs_to_jiffies(CDNS_TX_TIMEOUT));
	if (!time) {
		dev_err(cdns->dev, "IO transfer timed out, cmd %d device %d addr %x len %d\n",
			cmd, msg->dev_num, msg->addr, msg->len);
		msg->len = 0;
		return SDW_CMD_TIMEOUT;
	}

	return cdns_fill_msg_resp(cdns, msg, count, offset);
}

static enum sdw_command_response
cdns_program_scp_addr(struct sdw_cdns *cdns, struct sdw_msg *msg)
{
	int nack = 0, no_ack = 0;
	unsigned long time;
	u32 data[2], base;
	int i;

	/* Program the watermark level for RX FIFO */
	if (cdns->msg_count != CDNS_SCP_RX_FIFOLEVEL) {
		cdns_writel(cdns, CDNS_MCP_FIFOLEVEL, CDNS_SCP_RX_FIFOLEVEL);
		cdns->msg_count = CDNS_SCP_RX_FIFOLEVEL;
	}

	data[0] = FIELD_PREP(CDNS_MCP_CMD_DEV_ADDR, msg->dev_num);
	data[0] |= FIELD_PREP(CDNS_MCP_CMD_COMMAND, 0x3);
	data[1] = data[0];

	data[0] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE1);
	data[1] |= FIELD_PREP(CDNS_MCP_CMD_REG_ADDR, SDW_SCP_ADDRPAGE2);

	data[0] |= msg->addr_page1;
	data[1] |= msg->addr_page2;

	base = CDNS_MCP_CMD_BASE;
	cdns_writel(cdns, base, data[0]);
	base += CDNS_MCP_CMD_WORD_LEN;
	cdns_writel(cdns, base, data[1]);

	time = wait_for_completion_timeout(&cdns->tx_complete,
					   msecs_to_jiffies(CDNS_TX_TIMEOUT));
	if (!time) {
		dev_err(cdns->dev, "SCP Msg trf timed out\n");
		msg->len = 0;
		return SDW_CMD_TIMEOUT;
	}

	/* check response the writes */
	for (i = 0; i < 2; i++) {
		if (!(cdns->response_buf[i] & CDNS_MCP_RESP_ACK)) {
			no_ack = 1;
			dev_err(cdns->dev, "Program SCP Ack not received\n");
			if (cdns->response_buf[i] & CDNS_MCP_RESP_NACK) {
				nack = 1;
				dev_err(cdns->dev, "Program SCP NACK received\n");
			}
		}
	}

	/* For NACK, NO ack, don't return err if we are in Broadcast mode */
	if (nack) {
		dev_err_ratelimited(cdns->dev,
				    "SCP_addrpage NACKed for Slave %d\n", msg->dev_num);
		return SDW_CMD_FAIL;
	}

	if (no_ack) {
		dev_dbg_ratelimited(cdns->dev,
				    "SCP_addrpage ignored for Slave %d\n", msg->dev_num);
		return SDW_CMD_IGNORED;
	}

	return SDW_CMD_OK;
}

static int cdns_prep_msg(struct sdw_cdns *cdns, struct sdw_msg *msg, int *cmd)
{
	int ret;

	if (msg->page) {
		ret = cdns_program_scp_addr(cdns, msg);
		if (ret) {
			msg->len = 0;
			return ret;
		}
	}

	switch (msg->flags) {
	case SDW_MSG_FLAG_READ:
		*cmd = CDNS_MCP_CMD_READ;
		break;

	case SDW_MSG_FLAG_WRITE:
		*cmd = CDNS_MCP_CMD_WRITE;
		break;

	default:
		dev_err(cdns->dev, "Invalid msg cmd: %d\n", msg->flags);
		return -EINVAL;
	}

	return 0;
}

enum sdw_command_response
cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg)
{
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	int cmd = 0, ret, i;

	ret = cdns_prep_msg(cdns, msg, &cmd);
	if (ret)
		return SDW_CMD_FAIL_OTHER;

	for (i = 0; i < msg->len / CDNS_MCP_CMD_LEN; i++) {
		ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
				     CDNS_MCP_CMD_LEN, false);
		if (ret < 0)
			goto exit;
	}

	if (!(msg->len % CDNS_MCP_CMD_LEN))
		goto exit;

	ret = _cdns_xfer_msg(cdns, msg, cmd, i * CDNS_MCP_CMD_LEN,
			     msg->len % CDNS_MCP_CMD_LEN, false);

exit:
	return ret;
}
EXPORT_SYMBOL(cdns_xfer_msg);

enum sdw_command_response
cdns_xfer_msg_defer(struct sdw_bus *bus,
		    struct sdw_msg *msg, struct sdw_defer *defer)
{
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	int cmd = 0, ret;

	/* for defer only 1 message is supported */
	if (msg->len > 1)
		return -ENOTSUPP;

	ret = cdns_prep_msg(cdns, msg, &cmd);
	if (ret)
		return SDW_CMD_FAIL_OTHER;

	cdns->defer = defer;
	cdns->defer->length = msg->len;

	return _cdns_xfer_msg(cdns, msg, cmd, 0, msg->len, true);
}
EXPORT_SYMBOL(cdns_xfer_msg_defer);

enum sdw_command_response
cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num)
{
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	struct sdw_msg msg;

	/* Create dummy message with valid device number */
	memset(&msg, 0, sizeof(msg));
	msg.dev_num = dev_num;

	return cdns_program_scp_addr(cdns, &msg);
}
EXPORT_SYMBOL(cdns_reset_page_addr);

/*
 * IRQ handling
 */

static void cdns_read_response(struct sdw_cdns *cdns)
{
	u32 num_resp, cmd_base;
	int i;

	num_resp = cdns_readl(cdns, CDNS_MCP_FIFOSTAT);
	num_resp &= CDNS_MCP_RX_FIFO_AVAIL;

	cmd_base = CDNS_MCP_CMD_BASE;

	for (i = 0; i < num_resp; i++) {
		cdns->response_buf[i] = cdns_readl(cdns, cmd_base);
		cmd_base += CDNS_MCP_CMD_WORD_LEN;
	}
}

static int cdns_update_slave_status(struct sdw_cdns *cdns,
				    u64 slave_intstat)
{
	enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
	bool is_slave = false;
	u32 mask;
	int i, set_status;

	memset(status, 0, sizeof(status));

	for (i = 0; i <= SDW_MAX_DEVICES; i++) {
		mask = (slave_intstat >> (i * CDNS_MCP_SLAVE_STATUS_NUM)) &
			CDNS_MCP_SLAVE_STATUS_BITS;
		if (!mask)
			continue;

		is_slave = true;
		set_status = 0;

		if (mask & CDNS_MCP_SLAVE_INTSTAT_RESERVED) {
			status[i] = SDW_SLAVE_RESERVED;
			set_status++;
		}

		if (mask & CDNS_MCP_SLAVE_INTSTAT_ATTACHED) {
			status[i] = SDW_SLAVE_ATTACHED;
			set_status++;
		}

		if (mask & CDNS_MCP_SLAVE_INTSTAT_ALERT) {
			status[i] = SDW_SLAVE_ALERT;
			set_status++;
		}

		if (mask & CDNS_MCP_SLAVE_INTSTAT_NPRESENT) {
			status[i] = SDW_SLAVE_UNATTACHED;
			set_status++;
		}

		/* first check if Slave reported multiple status */
		if (set_status > 1) {
			u32 val;

			dev_warn_ratelimited(cdns->dev,
					     "Slave %d reported multiple Status: %d\n",
					     i, mask);

			/* check latest status extracted from PING commands */
			val = cdns_readl(cdns, CDNS_MCP_SLAVE_STAT);
			val >>= (i * 2);

			switch (val & 0x3) {
			case 0:
				status[i] = SDW_SLAVE_UNATTACHED;
				break;
			case 1:
				status[i] = SDW_SLAVE_ATTACHED;
				break;
			case 2:
				status[i] = SDW_SLAVE_ALERT;
				break;
			case 3:
			default:
				status[i] = SDW_SLAVE_RESERVED;
				break;
			}

			dev_warn_ratelimited(cdns->dev,
					     "Slave %d status updated to %d\n",
					     i, status[i]);

		}
	}

	if (is_slave)
		return sdw_handle_slave_status(&cdns->bus, status);

	return 0;
}

/**
 * sdw_cdns_irq() - Cadence interrupt handler
 * @irq: irq number
 * @dev_id: irq context
 */
irqreturn_t sdw_cdns_irq(int irq, void *dev_id)
{
	struct sdw_cdns *cdns = dev_id;
	u32 int_status;

	/* Check if the link is up */
	if (!cdns->link_up)
		return IRQ_NONE;

	int_status = cdns_readl(cdns, CDNS_MCP_INTSTAT);

	/* check for reserved values read as zero */
	if (int_status & CDNS_MCP_INT_RESERVED)
		return IRQ_NONE;

	if (!(int_status & CDNS_MCP_INT_IRQ))
		return IRQ_NONE;

	if (int_status & CDNS_MCP_INT_RX_WL) {
		cdns_read_response(cdns);

		if (cdns->defer) {
			cdns_fill_msg_resp(cdns, cdns->defer->msg,
					   cdns->defer->length, 0);
			complete(&cdns->defer->complete);
			cdns->defer = NULL;
		} else {
			complete(&cdns->tx_complete);
		}
	}

	if (int_status & CDNS_MCP_INT_PARITY) {
		/* Parity error detected by Master */
		dev_err_ratelimited(cdns->dev, "Parity error\n");
	}

	if (int_status & CDNS_MCP_INT_CTRL_CLASH) {
		/* Slave is driving bit slot during control word */
		dev_err_ratelimited(cdns->dev, "Bus clash for control word\n");
	}

	if (int_status & CDNS_MCP_INT_DATA_CLASH) {
		/*
		 * Multiple slaves trying to drive bit slot, or issue with
		 * ownership of data bits or Slave gone bonkers
		 */
		dev_err_ratelimited(cdns->dev, "Bus clash for data word\n");
	}

	if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL &&
	    int_status & CDNS_MCP_INT_DPINT) {
		u32 port_intstat;

		/* just log which ports report an error */
		port_intstat = cdns_readl(cdns, CDNS_MCP_PORT_INTSTAT);
		dev_err_ratelimited(cdns->dev, "DP interrupt: PortIntStat %8x\n",
				    port_intstat);

		/* clear status w/ write1 */
		cdns_writel(cdns, CDNS_MCP_PORT_INTSTAT, port_intstat);
	}

	if (int_status & CDNS_MCP_INT_SLAVE_MASK) {
		/* Mask the Slave interrupt and wake thread */
		cdns_updatel(cdns, CDNS_MCP_INTMASK,
			     CDNS_MCP_INT_SLAVE_MASK, 0);

		int_status &= ~CDNS_MCP_INT_SLAVE_MASK;

		/*
		 * Deal with possible race condition between interrupt
		 * handling and disabling interrupts on suspend.
		 *
		 * If the master is in the process of disabling
		 * interrupts, don't schedule a workqueue
		 */
		if (cdns->interrupt_enabled)
			schedule_work(&cdns->work);
	}

	cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status);
	return IRQ_HANDLED;
}
EXPORT_SYMBOL(sdw_cdns_irq);

/**
 * cdns_update_slave_status_work - update slave status in a work since we will need to handle
 * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave
 * process.
 * @work: cdns worker thread
 */
static void cdns_update_slave_status_work(struct work_struct *work)
{
	struct sdw_cdns *cdns =
		container_of(work, struct sdw_cdns, work);
	u32 slave0, slave1;
	u64 slave_intstat;

	slave0 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
	slave1 = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);

	/* combine the two status */
	slave_intstat = ((u64)slave1 << 32) | slave0;

	dev_dbg_ratelimited(cdns->dev, "Slave status change: 0x%llx\n", slave_intstat);

	cdns_update_slave_status(cdns, slave_intstat);
	cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave0);
	cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave1);

	/* clear and unmask Slave interrupt now */
	cdns_writel(cdns, CDNS_MCP_INTSTAT, CDNS_MCP_INT_SLAVE_MASK);
	cdns_updatel(cdns, CDNS_MCP_INTMASK,
		     CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK);

}

/* paranoia check to make sure self-cleared bits are indeed cleared */
void sdw_cdns_check_self_clearing_bits(struct sdw_cdns *cdns, const char *string,
				       bool initial_delay, int reset_iterations)
{
	u32 mcp_control;
	u32 mcp_config_update;
	int i;

	if (initial_delay)
		usleep_range(1000, 1500);

	mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);

	/* the following bits should be cleared immediately */
	if (mcp_control & CDNS_MCP_CONTROL_CMD_RST)
		dev_err(cdns->dev, "%s failed: MCP_CONTROL_CMD_RST is not cleared\n", string);
	if (mcp_control & CDNS_MCP_CONTROL_SOFT_RST)
		dev_err(cdns->dev, "%s failed: MCP_CONTROL_SOFT_RST is not cleared\n", string);
	if (mcp_control & CDNS_MCP_CONTROL_SW_RST)
		dev_err(cdns->dev, "%s failed: MCP_CONTROL_SW_RST is not cleared\n", string);
	if (mcp_control & CDNS_MCP_CONTROL_CLK_STOP_CLR)
		dev_err(cdns->dev, "%s failed: MCP_CONTROL_CLK_STOP_CLR is not cleared\n", string);
	mcp_config_update = cdns_readl(cdns, CDNS_MCP_CONFIG_UPDATE);
	if (mcp_config_update & CDNS_MCP_CONFIG_UPDATE_BIT)
		dev_err(cdns->dev, "%s failed: MCP_CONFIG_UPDATE_BIT is not cleared\n", string);

	i = 0;
	while (mcp_control & CDNS_MCP_CONTROL_HW_RST) {
		if (i == reset_iterations) {
			dev_err(cdns->dev, "%s failed: MCP_CONTROL_HW_RST is not cleared\n", string);
			break;
		}

		dev_dbg(cdns->dev, "%s: MCP_CONTROL_HW_RST is not cleared at iteration %d\n", string, i);
		i++;

		usleep_range(1000, 1500);
		mcp_control = cdns_readl(cdns, CDNS_MCP_CONTROL);
	}

}
EXPORT_SYMBOL(sdw_cdns_check_self_clearing_bits);

/*
 * init routines
 */

/**
 * sdw_cdns_exit_reset() - Program reset parameters and start bus operations
 * @cdns: Cadence instance
 */
int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
{
	/* keep reset delay unchanged to 4096 cycles */

	/* use hardware generated reset */
	cdns_updatel(cdns, CDNS_MCP_CONTROL,
		     CDNS_MCP_CONTROL_HW_RST,
		     CDNS_MCP_CONTROL_HW_RST);

	/* commit changes */
	cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
		     CDNS_MCP_CONFIG_UPDATE_BIT,
		     CDNS_MCP_CONFIG_UPDATE_BIT);

	/* don't wait here */
	return 0;

}
EXPORT_SYMBOL(sdw_cdns_exit_reset);

/**
 * cdns_enable_slave_interrupts() - Enable SDW slave interrupts
 * @cdns: Cadence instance
 * @state: boolean for true/false
 */
static void cdns_enable_slave_interrupts(struct sdw_cdns *cdns, bool state)
{
	u32 mask;

	mask = cdns_readl(cdns, CDNS_MCP_INTMASK);
	if (state)
		mask |= CDNS_MCP_INT_SLAVE_MASK;
	else
		mask &= ~CDNS_MCP_INT_SLAVE_MASK;

	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);
}

/**
 * sdw_cdns_enable_interrupt() - Enable SDW interrupts
 * @cdns: Cadence instance
 * @state: True if we are trying to enable interrupt.
 */
int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state)
{
	u32 slave_intmask0 = 0;
	u32 slave_intmask1 = 0;
	u32 mask = 0;

	if (!state)
		goto update_masks;

	slave_intmask0 = CDNS_MCP_SLAVE_INTMASK0_MASK;
	slave_intmask1 = CDNS_MCP_SLAVE_INTMASK1_MASK;

	/* enable detection of all slave state changes */
	mask = CDNS_MCP_INT_SLAVE_MASK;

	/* enable detection of bus issues */
	mask |= CDNS_MCP_INT_CTRL_CLASH | CDNS_MCP_INT_DATA_CLASH |
		CDNS_MCP_INT_PARITY;

	/* port interrupt limited to test modes for now */
	if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
		mask |= CDNS_MCP_INT_DPINT;

	/* enable detection of RX fifo level */
	mask |= CDNS_MCP_INT_RX_WL;

	/*
	 * CDNS_MCP_INT_IRQ needs to be set otherwise all previous
	 * settings are irrelevant
	 */
	mask |= CDNS_MCP_INT_IRQ;

	if (interrupt_mask) /* parameter override */
		mask = interrupt_mask;

update_masks:
	/* clear slave interrupt status before enabling interrupt */
	if (state) {
		u32 slave_state;

		slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT0);
		cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT0, slave_state);
		slave_state = cdns_readl(cdns, CDNS_MCP_SLAVE_INTSTAT1);
		cdns_writel(cdns, CDNS_MCP_SLAVE_INTSTAT1, slave_state);
	}
	cdns->interrupt_enabled = state;

	/*
	 * Complete any on-going status updates before updating masks,
	 * and cancel queued status updates.
	 *
	 * There could be a race with a new interrupt thrown before
	 * the 3 mask updates below are complete, so in the interrupt
	 * we use the 'interrupt_enabled' status to prevent new work
	 * from being queued.
	 */
	if (!state)
		cancel_work_sync(&cdns->work);

	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK0, slave_intmask0);
	cdns_writel(cdns, CDNS_MCP_SLAVE_INTMASK1, slave_intmask1);
	cdns_writel(cdns, CDNS_MCP_INTMASK, mask);

	return 0;
}
EXPORT_SYMBOL(sdw_cdns_enable_interrupt);

static int cdns_allocate_pdi(struct sdw_cdns *cdns,
			     struct sdw_cdns_pdi **stream,
			     u32 num, u32 pdi_offset)
{
	struct sdw_cdns_pdi *pdi;
	int i;

	if (!num)
		return 0;

	pdi = devm_kcalloc(cdns->dev, num, sizeof(*pdi), GFP_KERNEL);
	if (!pdi)
		return -ENOMEM;

	for (i = 0; i < num; i++) {
		pdi[i].num = i + pdi_offset;
	}

	*stream = pdi;
	return 0;
}

/**
 * sdw_cdns_pdi_init() - PDI initialization routine
 *
 * @cdns: Cadence instance
 * @config: Stream configurations
 */
int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
		      struct sdw_cdns_stream_config config)
{
	struct sdw_cdns_streams *stream;
	int offset;
	int ret;

	cdns->pcm.num_bd = config.pcm_bd;
	cdns->pcm.num_in = config.pcm_in;
	cdns->pcm.num_out = config.pcm_out;
	cdns->pdm.num_bd = config.pdm_bd;
	cdns->pdm.num_in = config.pdm_in;
	cdns->pdm.num_out = config.pdm_out;

	/* Allocate PDIs for PCMs */
	stream = &cdns->pcm;

	/* we allocate PDI0 and PDI1 which are used for Bulk */
	offset = 0;

	ret = cdns_allocate_pdi(cdns, &stream->bd,
				stream->num_bd, offset);
	if (ret)
		return ret;

	offset += stream->num_bd;

	ret = cdns_allocate_pdi(cdns, &stream->in,
				stream->num_in, offset);
	if (ret)
		return ret;

	offset += stream->num_in;

	ret = cdns_allocate_pdi(cdns, &stream->out,
				stream->num_out, offset);
	if (ret)
		return ret;

	/* Update total number of PCM PDIs */
	stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
	cdns->num_ports = stream->num_pdi;

	/* Allocate PDIs for PDMs */
	stream = &cdns->pdm;
	ret = cdns_allocate_pdi(cdns, &stream->bd,
				stream->num_bd, offset);
	if (ret)
		return ret;

	offset += stream->num_bd;

	ret = cdns_allocate_pdi(cdns, &stream->in,
				stream->num_in, offset);
	if (ret)
		return ret;

	offset += stream->num_in;

	ret = cdns_allocate_pdi(cdns, &stream->out,
				stream->num_out, offset);

	if (ret)
		return ret;

	/* Update total number of PDM PDIs */
	stream->num_pdi = stream->num_bd + stream->num_in + stream->num_out;
	cdns->num_ports += stream->num_pdi;

	return 0;
}
EXPORT_SYMBOL(sdw_cdns_pdi_init);

static u32 cdns_set_initial_frame_shape(int n_rows, int n_cols)
{
	u32 val;
	int c;
	int r;

	r = sdw_find_row_index(n_rows);
	c = sdw_find_col_index(n_cols);

	val = FIELD_PREP(CDNS_MCP_FRAME_SHAPE_ROW_MASK, r);
	val |= FIELD_PREP(CDNS_MCP_FRAME_SHAPE_COL_MASK, c);

	return val;
}

static void cdns_init_clock_ctrl(struct sdw_cdns *cdns)
{
	struct sdw_bus *bus = &cdns->bus;
	struct sdw_master_prop *prop = &bus->prop;
	u32 val;
	u32 ssp_interval;
	int divider;

	/* Set clock divider */
	divider	= (prop->mclk_freq / prop->max_clk_freq) - 1;

	cdns_updatel(cdns, CDNS_MCP_CLK_CTRL0,
		     CDNS_MCP_CLK_MCLKD_MASK, divider);
	cdns_updatel(cdns, CDNS_MCP_CLK_CTRL1,
		     CDNS_MCP_CLK_MCLKD_MASK, divider);

	/*
	 * Frame shape changes after initialization have to be done
	 * with the bank switch mechanism
	 */
	val = cdns_set_initial_frame_shape(prop->default_row,
					   prop->default_col);
	cdns_writel(cdns, CDNS_MCP_FRAME_SHAPE_INIT, val);

	/* Set SSP interval to default value */
	ssp_interval = prop->default_frame_rate / SDW_CADENCE_GSYNC_HZ;
	cdns_writel(cdns, CDNS_MCP_SSP_CTRL0, ssp_interval);
	cdns_writel(cdns, CDNS_MCP_SSP_CTRL1, ssp_interval);
}

/**
 * sdw_cdns_init() - Cadence initialization
 * @cdns: Cadence instance
 */
int sdw_cdns_init(struct sdw_cdns *cdns)
{
	u32 val;

	cdns_init_clock_ctrl(cdns);

	sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);

	/* reset msg_count to default value of FIFOLEVEL */
	cdns->msg_count = cdns_readl(cdns, CDNS_MCP_FIFOLEVEL);

	/* flush command FIFOs */
	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_RST,
		     CDNS_MCP_CONTROL_CMD_RST);

	/* Set cmd accept mode */
	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
		     CDNS_MCP_CONTROL_CMD_ACCEPT);

	/* Configure mcp config */
	val = cdns_readl(cdns, CDNS_MCP_CONFIG);

	/* enable bus operations with clock and data */
	val &= ~CDNS_MCP_CONFIG_OP;
	val |= CDNS_MCP_CONFIG_OP_NORMAL;

	/* Set cmd mode for Tx and Rx cmds */
	val &= ~CDNS_MCP_CONFIG_CMD;

	/* Disable sniffer mode */
	val &= ~CDNS_MCP_CONFIG_SNIFFER;

	/* Disable auto bus release */
	val &= ~CDNS_MCP_CONFIG_BUS_REL;

	if (cdns->bus.multi_link)
		/* Set Multi-master mode to take gsync into account */
		val |= CDNS_MCP_CONFIG_MMASTER;

	/* leave frame delay to hardware default of 0x1F */

	/* leave command retry to hardware default of 0 */

	cdns_writel(cdns, CDNS_MCP_CONFIG, val);

	/* changes will be committed later */
	return 0;
}
EXPORT_SYMBOL(sdw_cdns_init);

int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params)
{
	struct sdw_master_prop *prop = &bus->prop;
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	int mcp_clkctrl_off;
	int divider;

	if (!params->curr_dr_freq) {
		dev_err(cdns->dev, "NULL curr_dr_freq\n");
		return -EINVAL;
	}

	divider	= prop->mclk_freq * SDW_DOUBLE_RATE_FACTOR /
		params->curr_dr_freq;
	divider--; /* divider is 1/(N+1) */

	if (params->next_bank)
		mcp_clkctrl_off = CDNS_MCP_CLK_CTRL1;
	else
		mcp_clkctrl_off = CDNS_MCP_CLK_CTRL0;

	cdns_updatel(cdns, mcp_clkctrl_off, CDNS_MCP_CLK_MCLKD_MASK, divider);

	return 0;
}
EXPORT_SYMBOL(cdns_bus_conf);

static int cdns_port_params(struct sdw_bus *bus,
			    struct sdw_port_params *p_params, unsigned int bank)
{
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	int dpn_config_off_source;
	int dpn_config_off_target;
	int target_num = p_params->num;
	int source_num = p_params->num;
	bool override = false;
	int dpn_config;

	if (target_num == cdns->pdi_loopback_target &&
	    cdns->pdi_loopback_source != -1) {
		source_num = cdns->pdi_loopback_source;
		override = true;
	}

	if (bank) {
		dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
		dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
	} else {
		dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
		dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
	}

	dpn_config = cdns_readl(cdns, dpn_config_off_source);

	/* use port params if there is no loopback, otherwise use source as is */
	if (!override) {
		u32p_replace_bits(&dpn_config, p_params->bps - 1, CDNS_DPN_CONFIG_WL);
		u32p_replace_bits(&dpn_config, p_params->flow_mode, CDNS_DPN_CONFIG_PORT_FLOW);
		u32p_replace_bits(&dpn_config, p_params->data_mode, CDNS_DPN_CONFIG_PORT_DAT);
	}

	cdns_writel(cdns, dpn_config_off_target, dpn_config);

	return 0;
}

static int cdns_transport_params(struct sdw_bus *bus,
				 struct sdw_transport_params *t_params,
				 enum sdw_reg_bank bank)
{
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	int dpn_config;
	int dpn_config_off_source;
	int dpn_config_off_target;
	int dpn_hctrl;
	int dpn_hctrl_off_source;
	int dpn_hctrl_off_target;
	int dpn_offsetctrl;
	int dpn_offsetctrl_off_source;
	int dpn_offsetctrl_off_target;
	int dpn_samplectrl;
	int dpn_samplectrl_off_source;
	int dpn_samplectrl_off_target;
	int source_num = t_params->port_num;
	int target_num = t_params->port_num;
	bool override = false;

	if (target_num == cdns->pdi_loopback_target &&
	    cdns->pdi_loopback_source != -1) {
		source_num = cdns->pdi_loopback_source;
		override = true;
	}

	/*
	 * Note: Only full data port is supported on the Master side for
	 * both PCM and PDM ports.
	 */

	if (bank) {
		dpn_config_off_source = CDNS_DPN_B1_CONFIG(source_num);
		dpn_hctrl_off_source = CDNS_DPN_B1_HCTRL(source_num);
		dpn_offsetctrl_off_source = CDNS_DPN_B1_OFFSET_CTRL(source_num);
		dpn_samplectrl_off_source = CDNS_DPN_B1_SAMPLE_CTRL(source_num);

		dpn_config_off_target = CDNS_DPN_B1_CONFIG(target_num);
		dpn_hctrl_off_target = CDNS_DPN_B1_HCTRL(target_num);
		dpn_offsetctrl_off_target = CDNS_DPN_B1_OFFSET_CTRL(target_num);
		dpn_samplectrl_off_target = CDNS_DPN_B1_SAMPLE_CTRL(target_num);

	} else {
		dpn_config_off_source = CDNS_DPN_B0_CONFIG(source_num);
		dpn_hctrl_off_source = CDNS_DPN_B0_HCTRL(source_num);
		dpn_offsetctrl_off_source = CDNS_DPN_B0_OFFSET_CTRL(source_num);
		dpn_samplectrl_off_source = CDNS_DPN_B0_SAMPLE_CTRL(source_num);

		dpn_config_off_target = CDNS_DPN_B0_CONFIG(target_num);
		dpn_hctrl_off_target = CDNS_DPN_B0_HCTRL(target_num);
		dpn_offsetctrl_off_target = CDNS_DPN_B0_OFFSET_CTRL(target_num);
		dpn_samplectrl_off_target = CDNS_DPN_B0_SAMPLE_CTRL(target_num);
	}

	dpn_config = cdns_readl(cdns, dpn_config_off_source);
	if (!override) {
		u32p_replace_bits(&dpn_config, t_params->blk_grp_ctrl, CDNS_DPN_CONFIG_BGC);
		u32p_replace_bits(&dpn_config, t_params->blk_pkg_mode, CDNS_DPN_CONFIG_BPM);
	}
	cdns_writel(cdns, dpn_config_off_target, dpn_config);

	if (!override) {
		dpn_offsetctrl = 0;
		u32p_replace_bits(&dpn_offsetctrl, t_params->offset1, CDNS_DPN_OFFSET_CTRL_1);
		u32p_replace_bits(&dpn_offsetctrl, t_params->offset2, CDNS_DPN_OFFSET_CTRL_2);
	} else {
		dpn_offsetctrl = cdns_readl(cdns, dpn_offsetctrl_off_source);
	}
	cdns_writel(cdns, dpn_offsetctrl_off_target,  dpn_offsetctrl);

	if (!override) {
		dpn_hctrl = 0;
		u32p_replace_bits(&dpn_hctrl, t_params->hstart, CDNS_DPN_HCTRL_HSTART);
		u32p_replace_bits(&dpn_hctrl, t_params->hstop, CDNS_DPN_HCTRL_HSTOP);
		u32p_replace_bits(&dpn_hctrl, t_params->lane_ctrl, CDNS_DPN_HCTRL_LCTRL);
	} else {
		dpn_hctrl = cdns_readl(cdns, dpn_hctrl_off_source);
	}
	cdns_writel(cdns, dpn_hctrl_off_target, dpn_hctrl);

	if (!override)
		dpn_samplectrl = t_params->sample_interval - 1;
	else
		dpn_samplectrl = cdns_readl(cdns, dpn_samplectrl_off_source);
	cdns_writel(cdns, dpn_samplectrl_off_target, dpn_samplectrl);

	return 0;
}

static int cdns_port_enable(struct sdw_bus *bus,
			    struct sdw_enable_ch *enable_ch, unsigned int bank)
{
	struct sdw_cdns *cdns = bus_to_cdns(bus);
	int dpn_chnen_off, ch_mask;

	if (bank)
		dpn_chnen_off = CDNS_DPN_B1_CH_EN(enable_ch->port_num);
	else
		dpn_chnen_off = CDNS_DPN_B0_CH_EN(enable_ch->port_num);

	ch_mask = enable_ch->ch_mask * enable_ch->enable;
	cdns_writel(cdns, dpn_chnen_off, ch_mask);

	return 0;
}

static const struct sdw_master_port_ops cdns_port_ops = {
	.dpn_set_port_params = cdns_port_params,
	.dpn_set_port_transport_params = cdns_transport_params,
	.dpn_port_enable_ch = cdns_port_enable,
};

/**
 * sdw_cdns_is_clock_stop: Check clock status
 *
 * @cdns: Cadence instance
 */
bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns)
{
	return !!(cdns_readl(cdns, CDNS_MCP_STAT) & CDNS_MCP_STAT_CLK_STOP);
}
EXPORT_SYMBOL(sdw_cdns_is_clock_stop);

/**
 * sdw_cdns_clock_stop: Cadence clock stop configuration routine
 *
 * @cdns: Cadence instance
 * @block_wake: prevent wakes if required by the platform
 */
int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake)
{
	bool slave_present = false;
	struct sdw_slave *slave;
	int ret;

	sdw_cdns_check_self_clearing_bits(cdns, __func__, false, 0);

	/* Check suspend status */
	if (sdw_cdns_is_clock_stop(cdns)) {
		dev_dbg(cdns->dev, "Clock is already stopped\n");
		return 0;
	}

	/*
	 * Before entering clock stop we mask the Slave
	 * interrupts. This helps avoid having to deal with e.g. a
	 * Slave becoming UNATTACHED while the clock is being stopped
	 */
	cdns_enable_slave_interrupts(cdns, false);

	/*
	 * For specific platforms, it is required to be able to put
	 * master into a state in which it ignores wake-up trials
	 * in clock stop state
	 */
	if (block_wake)
		cdns_updatel(cdns, CDNS_MCP_CONTROL,
			     CDNS_MCP_CONTROL_BLOCK_WAKEUP,
			     CDNS_MCP_CONTROL_BLOCK_WAKEUP);

	list_for_each_entry(slave, &cdns->bus.slaves, node) {
		if (slave->status == SDW_SLAVE_ATTACHED ||
		    slave->status == SDW_SLAVE_ALERT) {
			slave_present = true;
			break;
		}
	}

	/* commit changes */
	ret = cdns_config_update(cdns);
	if (ret < 0) {
		dev_err(cdns->dev, "%s: config_update failed\n", __func__);
		return ret;
	}

	/* Prepare slaves for clock stop */
	if (slave_present) {
		ret = sdw_bus_prep_clk_stop(&cdns->bus);
		if (ret < 0 && ret != -ENODATA) {
			dev_err(cdns->dev, "prepare clock stop failed %d\n", ret);
			return ret;
		}
	}

	/*
	 * Enter clock stop mode and only report errors if there are
	 * Slave devices present (ALERT or ATTACHED)
	 */
	ret = sdw_bus_clk_stop(&cdns->bus);
	if (ret < 0 && slave_present && ret != -ENODATA) {
		dev_err(cdns->dev, "bus clock stop failed %d\n", ret);
		return ret;
	}

	ret = cdns_set_wait(cdns, CDNS_MCP_STAT,
			    CDNS_MCP_STAT_CLK_STOP,
			    CDNS_MCP_STAT_CLK_STOP);
	if (ret < 0)
		dev_err(cdns->dev, "Clock stop failed %d\n", ret);

	return ret;
}
EXPORT_SYMBOL(sdw_cdns_clock_stop);

/**
 * sdw_cdns_clock_restart: Cadence PM clock restart configuration routine
 *
 * @cdns: Cadence instance
 * @bus_reset: context may be lost while in low power modes and the bus
 * may require a Severe Reset and re-enumeration after a wake.
 */
int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset)
{
	int ret;

	/* unmask Slave interrupts that were masked when stopping the clock */
	cdns_enable_slave_interrupts(cdns, true);

	ret = cdns_clear_bit(cdns, CDNS_MCP_CONTROL,
			     CDNS_MCP_CONTROL_CLK_STOP_CLR);
	if (ret < 0) {
		dev_err(cdns->dev, "Couldn't exit from clock stop\n");
		return ret;
	}

	ret = cdns_set_wait(cdns, CDNS_MCP_STAT, CDNS_MCP_STAT_CLK_STOP, 0);
	if (ret < 0) {
		dev_err(cdns->dev, "clock stop exit failed %d\n", ret);
		return ret;
	}

	cdns_updatel(cdns, CDNS_MCP_CONTROL,
		     CDNS_MCP_CONTROL_BLOCK_WAKEUP, 0);

	cdns_updatel(cdns, CDNS_MCP_CONTROL, CDNS_MCP_CONTROL_CMD_ACCEPT,
		     CDNS_MCP_CONTROL_CMD_ACCEPT);

	if (!bus_reset) {

		/* enable bus operations with clock and data */
		cdns_updatel(cdns, CDNS_MCP_CONFIG,
			     CDNS_MCP_CONFIG_OP,
			     CDNS_MCP_CONFIG_OP_NORMAL);

		ret = cdns_config_update(cdns);
		if (ret < 0) {
			dev_err(cdns->dev, "%s: config_update failed\n", __func__);
			return ret;
		}

		ret = sdw_bus_exit_clk_stop(&cdns->bus);
		if (ret < 0)
			dev_err(cdns->dev, "bus failed to exit clock stop %d\n", ret);
	}

	return ret;
}
EXPORT_SYMBOL(sdw_cdns_clock_restart);

/**
 * sdw_cdns_probe() - Cadence probe routine
 * @cdns: Cadence instance
 */
int sdw_cdns_probe(struct sdw_cdns *cdns)
{
	init_completion(&cdns->tx_complete);
	cdns->bus.port_ops = &cdns_port_ops;

	INIT_WORK(&cdns->work, cdns_update_slave_status_work);
	return 0;
}
EXPORT_SYMBOL(sdw_cdns_probe);

int cdns_set_sdw_stream(struct snd_soc_dai *dai,
			void *stream, bool pcm, int direction)
{
	struct sdw_cdns *cdns = snd_soc_dai_get_drvdata(dai);
	struct sdw_cdns_dma_data *dma;

	if (stream) {
		/* first paranoia check */
		if (direction == SNDRV_PCM_STREAM_PLAYBACK)
			dma = dai->playback_dma_data;
		else
			dma = dai->capture_dma_data;

		if (dma) {
			dev_err(dai->dev,
				"dma_data already allocated for dai %s\n",
				dai->name);
			return -EINVAL;
		}

		/* allocate and set dma info */
		dma = kzalloc(sizeof(*dma), GFP_KERNEL);
		if (!dma)
			return -ENOMEM;

		if (pcm)
			dma->stream_type = SDW_STREAM_PCM;
		else
			dma->stream_type = SDW_STREAM_PDM;

		dma->bus = &cdns->bus;
		dma->link_id = cdns->instance;

		dma->stream = stream;

		if (direction == SNDRV_PCM_STREAM_PLAYBACK)
			dai->playback_dma_data = dma;
		else
			dai->capture_dma_data = dma;
	} else {
		/* for NULL stream we release allocated dma_data */
		if (direction == SNDRV_PCM_STREAM_PLAYBACK) {
			kfree(dai->playback_dma_data);
			dai->playback_dma_data = NULL;
		} else {
			kfree(dai->capture_dma_data);
			dai->capture_dma_data = NULL;
		}
	}
	return 0;
}
EXPORT_SYMBOL(cdns_set_sdw_stream);

/**
 * cdns_find_pdi() - Find a free PDI
 *
 * @cdns: Cadence instance
 * @offset: Starting offset
 * @num: Number of PDIs
 * @pdi: PDI instances
 * @dai_id: DAI id
 *
 * Find a PDI for a given PDI array. The PDI num and dai_id are
 * expected to match, return NULL otherwise.
 */
static struct sdw_cdns_pdi *cdns_find_pdi(struct sdw_cdns *cdns,
					  unsigned int offset,
					  unsigned int num,
					  struct sdw_cdns_pdi *pdi,
					  int dai_id)
{
	int i;

	for (i = offset; i < offset + num; i++)
		if (pdi[i].num == dai_id)
			return &pdi[i];

	return NULL;
}

/**
 * sdw_cdns_config_stream: Configure a stream
 *
 * @cdns: Cadence instance
 * @ch: Channel count
 * @dir: Data direction
 * @pdi: PDI to be used
 */
void sdw_cdns_config_stream(struct sdw_cdns *cdns,
			    u32 ch, u32 dir, struct sdw_cdns_pdi *pdi)
{
	u32 offset, val = 0;

	if (dir == SDW_DATA_DIR_RX) {
		val = CDNS_PORTCTRL_DIRN;

		if (cdns->bus.params.m_data_mode != SDW_PORT_DATA_MODE_NORMAL)
			val |= CDNS_PORTCTRL_TEST_FAILED;
	}
	offset = CDNS_PORTCTRL + pdi->num * CDNS_PORT_OFFSET;
	cdns_updatel(cdns, offset,
		     CDNS_PORTCTRL_DIRN | CDNS_PORTCTRL_TEST_FAILED,
		     val);

	val = pdi->num;
	val |= CDNS_PDI_CONFIG_SOFT_RESET;
	val |= FIELD_PREP(CDNS_PDI_CONFIG_CHANNEL, (1 << ch) - 1);
	cdns_writel(cdns, CDNS_PDI_CONFIG(pdi->num), val);
}
EXPORT_SYMBOL(sdw_cdns_config_stream);

/**
 * sdw_cdns_alloc_pdi() - Allocate a PDI
 *
 * @cdns: Cadence instance
 * @stream: Stream to be allocated
 * @ch: Channel count
 * @dir: Data direction
 * @dai_id: DAI id
 */
struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
					struct sdw_cdns_streams *stream,
					u32 ch, u32 dir, int dai_id)
{
	struct sdw_cdns_pdi *pdi = NULL;

	if (dir == SDW_DATA_DIR_RX)
		pdi = cdns_find_pdi(cdns, 0, stream->num_in, stream->in,
				    dai_id);
	else
		pdi = cdns_find_pdi(cdns, 0, stream->num_out, stream->out,
				    dai_id);

	/* check if we found a PDI, else find in bi-directional */
	if (!pdi)
		pdi = cdns_find_pdi(cdns, 2, stream->num_bd, stream->bd,
				    dai_id);

	if (pdi) {
		pdi->l_ch_num = 0;
		pdi->h_ch_num = ch - 1;
		pdi->dir = dir;
		pdi->ch_count = ch;
	}

	return pdi;
}
EXPORT_SYMBOL(sdw_cdns_alloc_pdi);

MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("Cadence Soundwire Library");