summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/ccp/ccp-ops.c
blob: c6e883b296a973628df1a000990342728620ad9b (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
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
/*
 * AMD Cryptographic Coprocessor (CCP) driver
 *
 * Copyright (C) 2013 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/ccp.h>
#include <linux/scatterlist.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha.h>

#include "ccp-dev.h"

enum ccp_memtype {
	CCP_MEMTYPE_SYSTEM = 0,
	CCP_MEMTYPE_KSB,
	CCP_MEMTYPE_LOCAL,
	CCP_MEMTYPE__LAST,
};

struct ccp_dma_info {
	dma_addr_t address;
	unsigned int offset;
	unsigned int length;
	enum dma_data_direction dir;
};

struct ccp_dm_workarea {
	struct device *dev;
	struct dma_pool *dma_pool;
	unsigned int length;

	u8 *address;
	struct ccp_dma_info dma;
};

struct ccp_sg_workarea {
	struct scatterlist *sg;
	int nents;

	struct scatterlist *dma_sg;
	struct device *dma_dev;
	unsigned int dma_count;
	enum dma_data_direction dma_dir;

	unsigned int sg_used;

	u64 bytes_left;
};

struct ccp_data {
	struct ccp_sg_workarea sg_wa;
	struct ccp_dm_workarea dm_wa;
};

struct ccp_mem {
	enum ccp_memtype type;
	union {
		struct ccp_dma_info dma;
		u32 ksb;
	} u;
};

struct ccp_aes_op {
	enum ccp_aes_type type;
	enum ccp_aes_mode mode;
	enum ccp_aes_action action;
};

struct ccp_xts_aes_op {
	enum ccp_aes_action action;
	enum ccp_xts_aes_unit_size unit_size;
};

struct ccp_sha_op {
	enum ccp_sha_type type;
	u64 msg_bits;
};

struct ccp_rsa_op {
	u32 mod_size;
	u32 input_len;
};

struct ccp_passthru_op {
	enum ccp_passthru_bitwise bit_mod;
	enum ccp_passthru_byteswap byte_swap;
};

struct ccp_ecc_op {
	enum ccp_ecc_function function;
};

struct ccp_op {
	struct ccp_cmd_queue *cmd_q;

	u32 jobid;
	u32 ioc;
	u32 soc;
	u32 ksb_key;
	u32 ksb_ctx;
	u32 init;
	u32 eom;

	struct ccp_mem src;
	struct ccp_mem dst;

	union {
		struct ccp_aes_op aes;
		struct ccp_xts_aes_op xts;
		struct ccp_sha_op sha;
		struct ccp_rsa_op rsa;
		struct ccp_passthru_op passthru;
		struct ccp_ecc_op ecc;
	} u;
};

/* SHA initial context values */
static const __be32 ccp_sha1_init[CCP_SHA_CTXSIZE / sizeof(__be32)] = {
	cpu_to_be32(SHA1_H0), cpu_to_be32(SHA1_H1),
	cpu_to_be32(SHA1_H2), cpu_to_be32(SHA1_H3),
	cpu_to_be32(SHA1_H4), 0, 0, 0,
};

static const __be32 ccp_sha224_init[CCP_SHA_CTXSIZE / sizeof(__be32)] = {
	cpu_to_be32(SHA224_H0), cpu_to_be32(SHA224_H1),
	cpu_to_be32(SHA224_H2), cpu_to_be32(SHA224_H3),
	cpu_to_be32(SHA224_H4), cpu_to_be32(SHA224_H5),
	cpu_to_be32(SHA224_H6), cpu_to_be32(SHA224_H7),
};

static const __be32 ccp_sha256_init[CCP_SHA_CTXSIZE / sizeof(__be32)] = {
	cpu_to_be32(SHA256_H0), cpu_to_be32(SHA256_H1),
	cpu_to_be32(SHA256_H2), cpu_to_be32(SHA256_H3),
	cpu_to_be32(SHA256_H4), cpu_to_be32(SHA256_H5),
	cpu_to_be32(SHA256_H6), cpu_to_be32(SHA256_H7),
};

/* The CCP cannot perform zero-length sha operations so the caller
 * is required to buffer data for the final operation.  However, a
 * sha operation for a message with a total length of zero is valid
 * so known values are required to supply the result.
 */
static const u8 ccp_sha1_zero[CCP_SHA_CTXSIZE] = {
	0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d,
	0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90,
	0xaf, 0xd8, 0x07, 0x09, 0x00, 0x00, 0x00, 0x00,
	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};

static const u8 ccp_sha224_zero[CCP_SHA_CTXSIZE] = {
	0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9,
	0x47, 0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4,
	0x15, 0xa2, 0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a,
	0xc5, 0xb3, 0xe4, 0x2f, 0x00, 0x00, 0x00, 0x00,
};

static const u8 ccp_sha256_zero[CCP_SHA_CTXSIZE] = {
	0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14,
	0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24,
	0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c,
	0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55,
};

static u32 ccp_addr_lo(struct ccp_dma_info *info)
{
	return lower_32_bits(info->address + info->offset);
}

static u32 ccp_addr_hi(struct ccp_dma_info *info)
{
	return upper_32_bits(info->address + info->offset) & 0x0000ffff;
}

static int ccp_do_cmd(struct ccp_op *op, u32 *cr, unsigned int cr_count)
{
	struct ccp_cmd_queue *cmd_q = op->cmd_q;
	struct ccp_device *ccp = cmd_q->ccp;
	void __iomem *cr_addr;
	u32 cr0, cmd;
	unsigned int i;
	int ret = 0;

	/* We could read a status register to see how many free slots
	 * are actually available, but reading that register resets it
	 * and you could lose some error information.
	 */
	cmd_q->free_slots--;

	cr0 = (cmd_q->id << REQ0_CMD_Q_SHIFT)
	      | (op->jobid << REQ0_JOBID_SHIFT)
	      | REQ0_WAIT_FOR_WRITE;

	if (op->soc)
		cr0 |= REQ0_STOP_ON_COMPLETE
		       | REQ0_INT_ON_COMPLETE;

	if (op->ioc || !cmd_q->free_slots)
		cr0 |= REQ0_INT_ON_COMPLETE;

	/* Start at CMD_REQ1 */
	cr_addr = ccp->io_regs + CMD_REQ0 + CMD_REQ_INCR;

	mutex_lock(&ccp->req_mutex);

	/* Write CMD_REQ1 through CMD_REQx first */
	for (i = 0; i < cr_count; i++, cr_addr += CMD_REQ_INCR)
		iowrite32(*(cr + i), cr_addr);

	/* Tell the CCP to start */
	wmb();
	iowrite32(cr0, ccp->io_regs + CMD_REQ0);

	mutex_unlock(&ccp->req_mutex);

	if (cr0 & REQ0_INT_ON_COMPLETE) {
		/* Wait for the job to complete */
		ret = wait_event_interruptible(cmd_q->int_queue,
					       cmd_q->int_rcvd);
		if (ret || cmd_q->cmd_error) {
			/* On error delete all related jobs from the queue */
			cmd = (cmd_q->id << DEL_Q_ID_SHIFT)
			      | op->jobid;

			iowrite32(cmd, ccp->io_regs + DEL_CMD_Q_JOB);

			if (!ret)
				ret = -EIO;
		} else if (op->soc) {
			/* Delete just head job from the queue on SoC */
			cmd = DEL_Q_ACTIVE
			      | (cmd_q->id << DEL_Q_ID_SHIFT)
			      | op->jobid;

			iowrite32(cmd, ccp->io_regs + DEL_CMD_Q_JOB);
		}

		cmd_q->free_slots = CMD_Q_DEPTH(cmd_q->q_status);

		cmd_q->int_rcvd = 0;
	}

	return ret;
}

static int ccp_perform_aes(struct ccp_op *op)
{
	u32 cr[6];

	/* Fill out the register contents for REQ1 through REQ6 */
	cr[0] = (CCP_ENGINE_AES << REQ1_ENGINE_SHIFT)
		| (op->u.aes.type << REQ1_AES_TYPE_SHIFT)
		| (op->u.aes.mode << REQ1_AES_MODE_SHIFT)
		| (op->u.aes.action << REQ1_AES_ACTION_SHIFT)
		| (op->ksb_key << REQ1_KEY_KSB_SHIFT);
	cr[1] = op->src.u.dma.length - 1;
	cr[2] = ccp_addr_lo(&op->src.u.dma);
	cr[3] = (op->ksb_ctx << REQ4_KSB_SHIFT)
		| (CCP_MEMTYPE_SYSTEM << REQ4_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->src.u.dma);
	cr[4] = ccp_addr_lo(&op->dst.u.dma);
	cr[5] = (CCP_MEMTYPE_SYSTEM << REQ6_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->dst.u.dma);

	if (op->u.aes.mode == CCP_AES_MODE_CFB)
		cr[0] |= ((0x7f) << REQ1_AES_CFB_SIZE_SHIFT);

	if (op->eom)
		cr[0] |= REQ1_EOM;

	if (op->init)
		cr[0] |= REQ1_INIT;

	return ccp_do_cmd(op, cr, ARRAY_SIZE(cr));
}

static int ccp_perform_xts_aes(struct ccp_op *op)
{
	u32 cr[6];

	/* Fill out the register contents for REQ1 through REQ6 */
	cr[0] = (CCP_ENGINE_XTS_AES_128 << REQ1_ENGINE_SHIFT)
		| (op->u.xts.action << REQ1_AES_ACTION_SHIFT)
		| (op->u.xts.unit_size << REQ1_XTS_AES_SIZE_SHIFT)
		| (op->ksb_key << REQ1_KEY_KSB_SHIFT);
	cr[1] = op->src.u.dma.length - 1;
	cr[2] = ccp_addr_lo(&op->src.u.dma);
	cr[3] = (op->ksb_ctx << REQ4_KSB_SHIFT)
		| (CCP_MEMTYPE_SYSTEM << REQ4_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->src.u.dma);
	cr[4] = ccp_addr_lo(&op->dst.u.dma);
	cr[5] = (CCP_MEMTYPE_SYSTEM << REQ6_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->dst.u.dma);

	if (op->eom)
		cr[0] |= REQ1_EOM;

	if (op->init)
		cr[0] |= REQ1_INIT;

	return ccp_do_cmd(op, cr, ARRAY_SIZE(cr));
}

static int ccp_perform_sha(struct ccp_op *op)
{
	u32 cr[6];

	/* Fill out the register contents for REQ1 through REQ6 */
	cr[0] = (CCP_ENGINE_SHA << REQ1_ENGINE_SHIFT)
		| (op->u.sha.type << REQ1_SHA_TYPE_SHIFT)
		| REQ1_INIT;
	cr[1] = op->src.u.dma.length - 1;
	cr[2] = ccp_addr_lo(&op->src.u.dma);
	cr[3] = (op->ksb_ctx << REQ4_KSB_SHIFT)
		| (CCP_MEMTYPE_SYSTEM << REQ4_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->src.u.dma);

	if (op->eom) {
		cr[0] |= REQ1_EOM;
		cr[4] = lower_32_bits(op->u.sha.msg_bits);
		cr[5] = upper_32_bits(op->u.sha.msg_bits);
	} else {
		cr[4] = 0;
		cr[5] = 0;
	}

	return ccp_do_cmd(op, cr, ARRAY_SIZE(cr));
}

static int ccp_perform_rsa(struct ccp_op *op)
{
	u32 cr[6];

	/* Fill out the register contents for REQ1 through REQ6 */
	cr[0] = (CCP_ENGINE_RSA << REQ1_ENGINE_SHIFT)
		| (op->u.rsa.mod_size << REQ1_RSA_MOD_SIZE_SHIFT)
		| (op->ksb_key << REQ1_KEY_KSB_SHIFT)
		| REQ1_EOM;
	cr[1] = op->u.rsa.input_len - 1;
	cr[2] = ccp_addr_lo(&op->src.u.dma);
	cr[3] = (op->ksb_ctx << REQ4_KSB_SHIFT)
		| (CCP_MEMTYPE_SYSTEM << REQ4_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->src.u.dma);
	cr[4] = ccp_addr_lo(&op->dst.u.dma);
	cr[5] = (CCP_MEMTYPE_SYSTEM << REQ6_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->dst.u.dma);

	return ccp_do_cmd(op, cr, ARRAY_SIZE(cr));
}

static int ccp_perform_passthru(struct ccp_op *op)
{
	u32 cr[6];

	/* Fill out the register contents for REQ1 through REQ6 */
	cr[0] = (CCP_ENGINE_PASSTHRU << REQ1_ENGINE_SHIFT)
		| (op->u.passthru.bit_mod << REQ1_PT_BW_SHIFT)
		| (op->u.passthru.byte_swap << REQ1_PT_BS_SHIFT);

	if (op->src.type == CCP_MEMTYPE_SYSTEM)
		cr[1] = op->src.u.dma.length - 1;
	else
		cr[1] = op->dst.u.dma.length - 1;

	if (op->src.type == CCP_MEMTYPE_SYSTEM) {
		cr[2] = ccp_addr_lo(&op->src.u.dma);
		cr[3] = (CCP_MEMTYPE_SYSTEM << REQ4_MEMTYPE_SHIFT)
			| ccp_addr_hi(&op->src.u.dma);

		if (op->u.passthru.bit_mod != CCP_PASSTHRU_BITWISE_NOOP)
			cr[3] |= (op->ksb_key << REQ4_KSB_SHIFT);
	} else {
		cr[2] = op->src.u.ksb * CCP_KSB_BYTES;
		cr[3] = (CCP_MEMTYPE_KSB << REQ4_MEMTYPE_SHIFT);
	}

	if (op->dst.type == CCP_MEMTYPE_SYSTEM) {
		cr[4] = ccp_addr_lo(&op->dst.u.dma);
		cr[5] = (CCP_MEMTYPE_SYSTEM << REQ6_MEMTYPE_SHIFT)
			| ccp_addr_hi(&op->dst.u.dma);
	} else {
		cr[4] = op->dst.u.ksb * CCP_KSB_BYTES;
		cr[5] = (CCP_MEMTYPE_KSB << REQ6_MEMTYPE_SHIFT);
	}

	if (op->eom)
		cr[0] |= REQ1_EOM;

	return ccp_do_cmd(op, cr, ARRAY_SIZE(cr));
}

static int ccp_perform_ecc(struct ccp_op *op)
{
	u32 cr[6];

	/* Fill out the register contents for REQ1 through REQ6 */
	cr[0] = REQ1_ECC_AFFINE_CONVERT
		| (CCP_ENGINE_ECC << REQ1_ENGINE_SHIFT)
		| (op->u.ecc.function << REQ1_ECC_FUNCTION_SHIFT)
		| REQ1_EOM;
	cr[1] = op->src.u.dma.length - 1;
	cr[2] = ccp_addr_lo(&op->src.u.dma);
	cr[3] = (CCP_MEMTYPE_SYSTEM << REQ4_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->src.u.dma);
	cr[4] = ccp_addr_lo(&op->dst.u.dma);
	cr[5] = (CCP_MEMTYPE_SYSTEM << REQ6_MEMTYPE_SHIFT)
		| ccp_addr_hi(&op->dst.u.dma);

	return ccp_do_cmd(op, cr, ARRAY_SIZE(cr));
}

static u32 ccp_alloc_ksb(struct ccp_device *ccp, unsigned int count)
{
	int start;

	for (;;) {
		mutex_lock(&ccp->ksb_mutex);

		start = (u32)bitmap_find_next_zero_area(ccp->ksb,
							ccp->ksb_count,
							ccp->ksb_start,
							count, 0);
		if (start <= ccp->ksb_count) {
			bitmap_set(ccp->ksb, start, count);

			mutex_unlock(&ccp->ksb_mutex);
			break;
		}

		ccp->ksb_avail = 0;

		mutex_unlock(&ccp->ksb_mutex);

		/* Wait for KSB entries to become available */
		if (wait_event_interruptible(ccp->ksb_queue, ccp->ksb_avail))
			return 0;
	}

	return KSB_START + start;
}

static void ccp_free_ksb(struct ccp_device *ccp, unsigned int start,
			 unsigned int count)
{
	if (!start)
		return;

	mutex_lock(&ccp->ksb_mutex);

	bitmap_clear(ccp->ksb, start - KSB_START, count);

	ccp->ksb_avail = 1;

	mutex_unlock(&ccp->ksb_mutex);

	wake_up_interruptible_all(&ccp->ksb_queue);
}

static u32 ccp_gen_jobid(struct ccp_device *ccp)
{
	return atomic_inc_return(&ccp->current_id) & CCP_JOBID_MASK;
}

static void ccp_sg_free(struct ccp_sg_workarea *wa)
{
	if (wa->dma_count)
		dma_unmap_sg(wa->dma_dev, wa->dma_sg, wa->nents, wa->dma_dir);

	wa->dma_count = 0;
}

static int ccp_init_sg_workarea(struct ccp_sg_workarea *wa, struct device *dev,
				struct scatterlist *sg, u64 len,
				enum dma_data_direction dma_dir)
{
	memset(wa, 0, sizeof(*wa));

	wa->sg = sg;
	if (!sg)
		return 0;

	wa->nents = sg_nents_for_len(sg, len);
	if (wa->nents < 0)
		return wa->nents;

	wa->bytes_left = len;
	wa->sg_used = 0;

	if (len == 0)
		return 0;

	if (dma_dir == DMA_NONE)
		return 0;

	wa->dma_sg = sg;
	wa->dma_dev = dev;
	wa->dma_dir = dma_dir;
	wa->dma_count = dma_map_sg(dev, sg, wa->nents, dma_dir);
	if (!wa->dma_count)
		return -ENOMEM;

	return 0;
}

static void ccp_update_sg_workarea(struct ccp_sg_workarea *wa, unsigned int len)
{
	unsigned int nbytes = min_t(u64, len, wa->bytes_left);

	if (!wa->sg)
		return;

	wa->sg_used += nbytes;
	wa->bytes_left -= nbytes;
	if (wa->sg_used == wa->sg->length) {
		wa->sg = sg_next(wa->sg);
		wa->sg_used = 0;
	}
}

static void ccp_dm_free(struct ccp_dm_workarea *wa)
{
	if (wa->length <= CCP_DMAPOOL_MAX_SIZE) {
		if (wa->address)
			dma_pool_free(wa->dma_pool, wa->address,
				      wa->dma.address);
	} else {
		if (wa->dma.address)
			dma_unmap_single(wa->dev, wa->dma.address, wa->length,
					 wa->dma.dir);
		kfree(wa->address);
	}

	wa->address = NULL;
	wa->dma.address = 0;
}

static int ccp_init_dm_workarea(struct ccp_dm_workarea *wa,
				struct ccp_cmd_queue *cmd_q,
				unsigned int len,
				enum dma_data_direction dir)
{
	memset(wa, 0, sizeof(*wa));

	if (!len)
		return 0;

	wa->dev = cmd_q->ccp->dev;
	wa->length = len;

	if (len <= CCP_DMAPOOL_MAX_SIZE) {
		wa->dma_pool = cmd_q->dma_pool;

		wa->address = dma_pool_alloc(wa->dma_pool, GFP_KERNEL,
					     &wa->dma.address);
		if (!wa->address)
			return -ENOMEM;

		wa->dma.length = CCP_DMAPOOL_MAX_SIZE;

		memset(wa->address, 0, CCP_DMAPOOL_MAX_SIZE);
	} else {
		wa->address = kzalloc(len, GFP_KERNEL);
		if (!wa->address)
			return -ENOMEM;

		wa->dma.address = dma_map_single(wa->dev, wa->address, len,
						 dir);
		if (!wa->dma.address)
			return -ENOMEM;

		wa->dma.length = len;
	}
	wa->dma.dir = dir;

	return 0;
}

static void ccp_set_dm_area(struct ccp_dm_workarea *wa, unsigned int wa_offset,
			    struct scatterlist *sg, unsigned int sg_offset,
			    unsigned int len)
{
	WARN_ON(!wa->address);

	scatterwalk_map_and_copy(wa->address + wa_offset, sg, sg_offset, len,
				 0);
}

static void ccp_get_dm_area(struct ccp_dm_workarea *wa, unsigned int wa_offset,
			    struct scatterlist *sg, unsigned int sg_offset,
			    unsigned int len)
{
	WARN_ON(!wa->address);

	scatterwalk_map_and_copy(wa->address + wa_offset, sg, sg_offset, len,
				 1);
}

static int ccp_reverse_set_dm_area(struct ccp_dm_workarea *wa,
				   struct scatterlist *sg,
				   unsigned int len, unsigned int se_len,
				   bool sign_extend)
{
	unsigned int nbytes, sg_offset, dm_offset, ksb_len, i;
	u8 buffer[CCP_REVERSE_BUF_SIZE];

	if (WARN_ON(se_len > sizeof(buffer)))
		return -EINVAL;

	sg_offset = len;
	dm_offset = 0;
	nbytes = len;
	while (nbytes) {
		ksb_len = min_t(unsigned int, nbytes, se_len);
		sg_offset -= ksb_len;

		scatterwalk_map_and_copy(buffer, sg, sg_offset, ksb_len, 0);
		for (i = 0; i < ksb_len; i++)
			wa->address[dm_offset + i] = buffer[ksb_len - i - 1];

		dm_offset += ksb_len;
		nbytes -= ksb_len;

		if ((ksb_len != se_len) && sign_extend) {
			/* Must sign-extend to nearest sign-extend length */
			if (wa->address[dm_offset - 1] & 0x80)
				memset(wa->address + dm_offset, 0xff,
				       se_len - ksb_len);
		}
	}

	return 0;
}

static void ccp_reverse_get_dm_area(struct ccp_dm_workarea *wa,
				    struct scatterlist *sg,
				    unsigned int len)
{
	unsigned int nbytes, sg_offset, dm_offset, ksb_len, i;
	u8 buffer[CCP_REVERSE_BUF_SIZE];

	sg_offset = 0;
	dm_offset = len;
	nbytes = len;
	while (nbytes) {
		ksb_len = min_t(unsigned int, nbytes, sizeof(buffer));
		dm_offset -= ksb_len;

		for (i = 0; i < ksb_len; i++)
			buffer[ksb_len - i - 1] = wa->address[dm_offset + i];
		scatterwalk_map_and_copy(buffer, sg, sg_offset, ksb_len, 1);

		sg_offset += ksb_len;
		nbytes -= ksb_len;
	}
}

static void ccp_free_data(struct ccp_data *data, struct ccp_cmd_queue *cmd_q)
{
	ccp_dm_free(&data->dm_wa);
	ccp_sg_free(&data->sg_wa);
}

static int ccp_init_data(struct ccp_data *data, struct ccp_cmd_queue *cmd_q,
			 struct scatterlist *sg, u64 sg_len,
			 unsigned int dm_len,
			 enum dma_data_direction dir)
{
	int ret;

	memset(data, 0, sizeof(*data));

	ret = ccp_init_sg_workarea(&data->sg_wa, cmd_q->ccp->dev, sg, sg_len,
				   dir);
	if (ret)
		goto e_err;

	ret = ccp_init_dm_workarea(&data->dm_wa, cmd_q, dm_len, dir);
	if (ret)
		goto e_err;

	return 0;

e_err:
	ccp_free_data(data, cmd_q);

	return ret;
}

static unsigned int ccp_queue_buf(struct ccp_data *data, unsigned int from)
{
	struct ccp_sg_workarea *sg_wa = &data->sg_wa;
	struct ccp_dm_workarea *dm_wa = &data->dm_wa;
	unsigned int buf_count, nbytes;

	/* Clear the buffer if setting it */
	if (!from)
		memset(dm_wa->address, 0, dm_wa->length);

	if (!sg_wa->sg)
		return 0;

	/* Perform the copy operation
	 *   nbytes will always be <= UINT_MAX because dm_wa->length is
	 *   an unsigned int
	 */
	nbytes = min_t(u64, sg_wa->bytes_left, dm_wa->length);
	scatterwalk_map_and_copy(dm_wa->address, sg_wa->sg, sg_wa->sg_used,
				 nbytes, from);

	/* Update the structures and generate the count */
	buf_count = 0;
	while (sg_wa->bytes_left && (buf_count < dm_wa->length)) {
		nbytes = min(sg_wa->sg->length - sg_wa->sg_used,
			     dm_wa->length - buf_count);
		nbytes = min_t(u64, sg_wa->bytes_left, nbytes);

		buf_count += nbytes;
		ccp_update_sg_workarea(sg_wa, nbytes);
	}

	return buf_count;
}

static unsigned int ccp_fill_queue_buf(struct ccp_data *data)
{
	return ccp_queue_buf(data, 0);
}

static unsigned int ccp_empty_queue_buf(struct ccp_data *data)
{
	return ccp_queue_buf(data, 1);
}

static void ccp_prepare_data(struct ccp_data *src, struct ccp_data *dst,
			     struct ccp_op *op, unsigned int block_size,
			     bool blocksize_op)
{
	unsigned int sg_src_len, sg_dst_len, op_len;

	/* The CCP can only DMA from/to one address each per operation. This
	 * requires that we find the smallest DMA area between the source
	 * and destination. The resulting len values will always be <= UINT_MAX
	 * because the dma length is an unsigned int.
	 */
	sg_src_len = sg_dma_len(src->sg_wa.sg) - src->sg_wa.sg_used;
	sg_src_len = min_t(u64, src->sg_wa.bytes_left, sg_src_len);

	if (dst) {
		sg_dst_len = sg_dma_len(dst->sg_wa.sg) - dst->sg_wa.sg_used;
		sg_dst_len = min_t(u64, src->sg_wa.bytes_left, sg_dst_len);
		op_len = min(sg_src_len, sg_dst_len);
	} else {
		op_len = sg_src_len;
	}

	/* The data operation length will be at least block_size in length
	 * or the smaller of available sg room remaining for the source or
	 * the destination
	 */
	op_len = max(op_len, block_size);

	/* Unless we have to buffer data, there's no reason to wait */
	op->soc = 0;

	if (sg_src_len < block_size) {
		/* Not enough data in the sg element, so it
		 * needs to be buffered into a blocksize chunk
		 */
		int cp_len = ccp_fill_queue_buf(src);

		op->soc = 1;
		op->src.u.dma.address = src->dm_wa.dma.address;
		op->src.u.dma.offset = 0;
		op->src.u.dma.length = (blocksize_op) ? block_size : cp_len;
	} else {
		/* Enough data in the sg element, but we need to
		 * adjust for any previously copied data
		 */
		op->src.u.dma.address = sg_dma_address(src->sg_wa.sg);
		op->src.u.dma.offset = src->sg_wa.sg_used;
		op->src.u.dma.length = op_len & ~(block_size - 1);

		ccp_update_sg_workarea(&src->sg_wa, op->src.u.dma.length);
	}

	if (dst) {
		if (sg_dst_len < block_size) {
			/* Not enough room in the sg element or we're on the
			 * last piece of data (when using padding), so the
			 * output needs to be buffered into a blocksize chunk
			 */
			op->soc = 1;
			op->dst.u.dma.address = dst->dm_wa.dma.address;
			op->dst.u.dma.offset = 0;
			op->dst.u.dma.length = op->src.u.dma.length;
		} else {
			/* Enough room in the sg element, but we need to
			 * adjust for any previously used area
			 */
			op->dst.u.dma.address = sg_dma_address(dst->sg_wa.sg);
			op->dst.u.dma.offset = dst->sg_wa.sg_used;
			op->dst.u.dma.length = op->src.u.dma.length;
		}
	}
}

static void ccp_process_data(struct ccp_data *src, struct ccp_data *dst,
			     struct ccp_op *op)
{
	op->init = 0;

	if (dst) {
		if (op->dst.u.dma.address == dst->dm_wa.dma.address)
			ccp_empty_queue_buf(dst);
		else
			ccp_update_sg_workarea(&dst->sg_wa,
					       op->dst.u.dma.length);
	}
}

static int ccp_copy_to_from_ksb(struct ccp_cmd_queue *cmd_q,
				struct ccp_dm_workarea *wa, u32 jobid, u32 ksb,
				u32 byte_swap, bool from)
{
	struct ccp_op op;

	memset(&op, 0, sizeof(op));

	op.cmd_q = cmd_q;
	op.jobid = jobid;
	op.eom = 1;

	if (from) {
		op.soc = 1;
		op.src.type = CCP_MEMTYPE_KSB;
		op.src.u.ksb = ksb;
		op.dst.type = CCP_MEMTYPE_SYSTEM;
		op.dst.u.dma.address = wa->dma.address;
		op.dst.u.dma.length = wa->length;
	} else {
		op.src.type = CCP_MEMTYPE_SYSTEM;
		op.src.u.dma.address = wa->dma.address;
		op.src.u.dma.length = wa->length;
		op.dst.type = CCP_MEMTYPE_KSB;
		op.dst.u.ksb = ksb;
	}

	op.u.passthru.byte_swap = byte_swap;

	return ccp_perform_passthru(&op);
}

static int ccp_copy_to_ksb(struct ccp_cmd_queue *cmd_q,
			   struct ccp_dm_workarea *wa, u32 jobid, u32 ksb,
			   u32 byte_swap)
{
	return ccp_copy_to_from_ksb(cmd_q, wa, jobid, ksb, byte_swap, false);
}

static int ccp_copy_from_ksb(struct ccp_cmd_queue *cmd_q,
			     struct ccp_dm_workarea *wa, u32 jobid, u32 ksb,
			     u32 byte_swap)
{
	return ccp_copy_to_from_ksb(cmd_q, wa, jobid, ksb, byte_swap, true);
}

static int ccp_run_aes_cmac_cmd(struct ccp_cmd_queue *cmd_q,
				struct ccp_cmd *cmd)
{
	struct ccp_aes_engine *aes = &cmd->u.aes;
	struct ccp_dm_workarea key, ctx;
	struct ccp_data src;
	struct ccp_op op;
	unsigned int dm_offset;
	int ret;

	if (!((aes->key_len == AES_KEYSIZE_128) ||
	      (aes->key_len == AES_KEYSIZE_192) ||
	      (aes->key_len == AES_KEYSIZE_256)))
		return -EINVAL;

	if (aes->src_len & (AES_BLOCK_SIZE - 1))
		return -EINVAL;

	if (aes->iv_len != AES_BLOCK_SIZE)
		return -EINVAL;

	if (!aes->key || !aes->iv || !aes->src)
		return -EINVAL;

	if (aes->cmac_final) {
		if (aes->cmac_key_len != AES_BLOCK_SIZE)
			return -EINVAL;

		if (!aes->cmac_key)
			return -EINVAL;
	}

	BUILD_BUG_ON(CCP_AES_KEY_KSB_COUNT != 1);
	BUILD_BUG_ON(CCP_AES_CTX_KSB_COUNT != 1);

	ret = -EIO;
	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);
	op.ksb_key = cmd_q->ksb_key;
	op.ksb_ctx = cmd_q->ksb_ctx;
	op.init = 1;
	op.u.aes.type = aes->type;
	op.u.aes.mode = aes->mode;
	op.u.aes.action = aes->action;

	/* All supported key sizes fit in a single (32-byte) KSB entry
	 * and must be in little endian format. Use the 256-bit byte
	 * swap passthru option to convert from big endian to little
	 * endian.
	 */
	ret = ccp_init_dm_workarea(&key, cmd_q,
				   CCP_AES_KEY_KSB_COUNT * CCP_KSB_BYTES,
				   DMA_TO_DEVICE);
	if (ret)
		return ret;

	dm_offset = CCP_KSB_BYTES - aes->key_len;
	ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
	ret = ccp_copy_to_ksb(cmd_q, &key, op.jobid, op.ksb_key,
			      CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_key;
	}

	/* The AES context fits in a single (32-byte) KSB entry and
	 * must be in little endian format. Use the 256-bit byte swap
	 * passthru option to convert from big endian to little endian.
	 */
	ret = ccp_init_dm_workarea(&ctx, cmd_q,
				   CCP_AES_CTX_KSB_COUNT * CCP_KSB_BYTES,
				   DMA_BIDIRECTIONAL);
	if (ret)
		goto e_key;

	dm_offset = CCP_KSB_BYTES - AES_BLOCK_SIZE;
	ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
	ret = ccp_copy_to_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
			      CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_ctx;
	}

	/* Send data to the CCP AES engine */
	ret = ccp_init_data(&src, cmd_q, aes->src, aes->src_len,
			    AES_BLOCK_SIZE, DMA_TO_DEVICE);
	if (ret)
		goto e_ctx;

	while (src.sg_wa.bytes_left) {
		ccp_prepare_data(&src, NULL, &op, AES_BLOCK_SIZE, true);
		if (aes->cmac_final && !src.sg_wa.bytes_left) {
			op.eom = 1;

			/* Push the K1/K2 key to the CCP now */
			ret = ccp_copy_from_ksb(cmd_q, &ctx, op.jobid,
						op.ksb_ctx,
						CCP_PASSTHRU_BYTESWAP_256BIT);
			if (ret) {
				cmd->engine_error = cmd_q->cmd_error;
				goto e_src;
			}

			ccp_set_dm_area(&ctx, 0, aes->cmac_key, 0,
					aes->cmac_key_len);
			ret = ccp_copy_to_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
					      CCP_PASSTHRU_BYTESWAP_256BIT);
			if (ret) {
				cmd->engine_error = cmd_q->cmd_error;
				goto e_src;
			}
		}

		ret = ccp_perform_aes(&op);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_src;
		}

		ccp_process_data(&src, NULL, &op);
	}

	/* Retrieve the AES context - convert from LE to BE using
	 * 32-byte (256-bit) byteswapping
	 */
	ret = ccp_copy_from_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
				CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_src;
	}

	/* ...but we only need AES_BLOCK_SIZE bytes */
	dm_offset = CCP_KSB_BYTES - AES_BLOCK_SIZE;
	ccp_get_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);

e_src:
	ccp_free_data(&src, cmd_q);

e_ctx:
	ccp_dm_free(&ctx);

e_key:
	ccp_dm_free(&key);

	return ret;
}

static int ccp_run_aes_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
	struct ccp_aes_engine *aes = &cmd->u.aes;
	struct ccp_dm_workarea key, ctx;
	struct ccp_data src, dst;
	struct ccp_op op;
	unsigned int dm_offset;
	bool in_place = false;
	int ret;

	if (aes->mode == CCP_AES_MODE_CMAC)
		return ccp_run_aes_cmac_cmd(cmd_q, cmd);

	if (!((aes->key_len == AES_KEYSIZE_128) ||
	      (aes->key_len == AES_KEYSIZE_192) ||
	      (aes->key_len == AES_KEYSIZE_256)))
		return -EINVAL;

	if (((aes->mode == CCP_AES_MODE_ECB) ||
	     (aes->mode == CCP_AES_MODE_CBC) ||
	     (aes->mode == CCP_AES_MODE_CFB)) &&
	    (aes->src_len & (AES_BLOCK_SIZE - 1)))
		return -EINVAL;

	if (!aes->key || !aes->src || !aes->dst)
		return -EINVAL;

	if (aes->mode != CCP_AES_MODE_ECB) {
		if (aes->iv_len != AES_BLOCK_SIZE)
			return -EINVAL;

		if (!aes->iv)
			return -EINVAL;
	}

	BUILD_BUG_ON(CCP_AES_KEY_KSB_COUNT != 1);
	BUILD_BUG_ON(CCP_AES_CTX_KSB_COUNT != 1);

	ret = -EIO;
	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);
	op.ksb_key = cmd_q->ksb_key;
	op.ksb_ctx = cmd_q->ksb_ctx;
	op.init = (aes->mode == CCP_AES_MODE_ECB) ? 0 : 1;
	op.u.aes.type = aes->type;
	op.u.aes.mode = aes->mode;
	op.u.aes.action = aes->action;

	/* All supported key sizes fit in a single (32-byte) KSB entry
	 * and must be in little endian format. Use the 256-bit byte
	 * swap passthru option to convert from big endian to little
	 * endian.
	 */
	ret = ccp_init_dm_workarea(&key, cmd_q,
				   CCP_AES_KEY_KSB_COUNT * CCP_KSB_BYTES,
				   DMA_TO_DEVICE);
	if (ret)
		return ret;

	dm_offset = CCP_KSB_BYTES - aes->key_len;
	ccp_set_dm_area(&key, dm_offset, aes->key, 0, aes->key_len);
	ret = ccp_copy_to_ksb(cmd_q, &key, op.jobid, op.ksb_key,
			      CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_key;
	}

	/* The AES context fits in a single (32-byte) KSB entry and
	 * must be in little endian format. Use the 256-bit byte swap
	 * passthru option to convert from big endian to little endian.
	 */
	ret = ccp_init_dm_workarea(&ctx, cmd_q,
				   CCP_AES_CTX_KSB_COUNT * CCP_KSB_BYTES,
				   DMA_BIDIRECTIONAL);
	if (ret)
		goto e_key;

	if (aes->mode != CCP_AES_MODE_ECB) {
		/* Load the AES context - conver to LE */
		dm_offset = CCP_KSB_BYTES - AES_BLOCK_SIZE;
		ccp_set_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
		ret = ccp_copy_to_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
				      CCP_PASSTHRU_BYTESWAP_256BIT);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_ctx;
		}
	}

	/* Prepare the input and output data workareas. For in-place
	 * operations we need to set the dma direction to BIDIRECTIONAL
	 * and copy the src workarea to the dst workarea.
	 */
	if (sg_virt(aes->src) == sg_virt(aes->dst))
		in_place = true;

	ret = ccp_init_data(&src, cmd_q, aes->src, aes->src_len,
			    AES_BLOCK_SIZE,
			    in_place ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE);
	if (ret)
		goto e_ctx;

	if (in_place) {
		dst = src;
	} else {
		ret = ccp_init_data(&dst, cmd_q, aes->dst, aes->src_len,
				    AES_BLOCK_SIZE, DMA_FROM_DEVICE);
		if (ret)
			goto e_src;
	}

	/* Send data to the CCP AES engine */
	while (src.sg_wa.bytes_left) {
		ccp_prepare_data(&src, &dst, &op, AES_BLOCK_SIZE, true);
		if (!src.sg_wa.bytes_left) {
			op.eom = 1;

			/* Since we don't retrieve the AES context in ECB
			 * mode we have to wait for the operation to complete
			 * on the last piece of data
			 */
			if (aes->mode == CCP_AES_MODE_ECB)
				op.soc = 1;
		}

		ret = ccp_perform_aes(&op);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_dst;
		}

		ccp_process_data(&src, &dst, &op);
	}

	if (aes->mode != CCP_AES_MODE_ECB) {
		/* Retrieve the AES context - convert from LE to BE using
		 * 32-byte (256-bit) byteswapping
		 */
		ret = ccp_copy_from_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
					CCP_PASSTHRU_BYTESWAP_256BIT);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_dst;
		}

		/* ...but we only need AES_BLOCK_SIZE bytes */
		dm_offset = CCP_KSB_BYTES - AES_BLOCK_SIZE;
		ccp_get_dm_area(&ctx, dm_offset, aes->iv, 0, aes->iv_len);
	}

e_dst:
	if (!in_place)
		ccp_free_data(&dst, cmd_q);

e_src:
	ccp_free_data(&src, cmd_q);

e_ctx:
	ccp_dm_free(&ctx);

e_key:
	ccp_dm_free(&key);

	return ret;
}

static int ccp_run_xts_aes_cmd(struct ccp_cmd_queue *cmd_q,
			       struct ccp_cmd *cmd)
{
	struct ccp_xts_aes_engine *xts = &cmd->u.xts;
	struct ccp_dm_workarea key, ctx;
	struct ccp_data src, dst;
	struct ccp_op op;
	unsigned int unit_size, dm_offset;
	bool in_place = false;
	int ret;

	switch (xts->unit_size) {
	case CCP_XTS_AES_UNIT_SIZE_16:
		unit_size = 16;
		break;
	case CCP_XTS_AES_UNIT_SIZE_512:
		unit_size = 512;
		break;
	case CCP_XTS_AES_UNIT_SIZE_1024:
		unit_size = 1024;
		break;
	case CCP_XTS_AES_UNIT_SIZE_2048:
		unit_size = 2048;
		break;
	case CCP_XTS_AES_UNIT_SIZE_4096:
		unit_size = 4096;
		break;

	default:
		return -EINVAL;
	}

	if (xts->key_len != AES_KEYSIZE_128)
		return -EINVAL;

	if (!xts->final && (xts->src_len & (AES_BLOCK_SIZE - 1)))
		return -EINVAL;

	if (xts->iv_len != AES_BLOCK_SIZE)
		return -EINVAL;

	if (!xts->key || !xts->iv || !xts->src || !xts->dst)
		return -EINVAL;

	BUILD_BUG_ON(CCP_XTS_AES_KEY_KSB_COUNT != 1);
	BUILD_BUG_ON(CCP_XTS_AES_CTX_KSB_COUNT != 1);

	ret = -EIO;
	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);
	op.ksb_key = cmd_q->ksb_key;
	op.ksb_ctx = cmd_q->ksb_ctx;
	op.init = 1;
	op.u.xts.action = xts->action;
	op.u.xts.unit_size = xts->unit_size;

	/* All supported key sizes fit in a single (32-byte) KSB entry
	 * and must be in little endian format. Use the 256-bit byte
	 * swap passthru option to convert from big endian to little
	 * endian.
	 */
	ret = ccp_init_dm_workarea(&key, cmd_q,
				   CCP_XTS_AES_KEY_KSB_COUNT * CCP_KSB_BYTES,
				   DMA_TO_DEVICE);
	if (ret)
		return ret;

	dm_offset = CCP_KSB_BYTES - AES_KEYSIZE_128;
	ccp_set_dm_area(&key, dm_offset, xts->key, 0, xts->key_len);
	ccp_set_dm_area(&key, 0, xts->key, dm_offset, xts->key_len);
	ret = ccp_copy_to_ksb(cmd_q, &key, op.jobid, op.ksb_key,
			      CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_key;
	}

	/* The AES context fits in a single (32-byte) KSB entry and
	 * for XTS is already in little endian format so no byte swapping
	 * is needed.
	 */
	ret = ccp_init_dm_workarea(&ctx, cmd_q,
				   CCP_XTS_AES_CTX_KSB_COUNT * CCP_KSB_BYTES,
				   DMA_BIDIRECTIONAL);
	if (ret)
		goto e_key;

	ccp_set_dm_area(&ctx, 0, xts->iv, 0, xts->iv_len);
	ret = ccp_copy_to_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
			      CCP_PASSTHRU_BYTESWAP_NOOP);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_ctx;
	}

	/* Prepare the input and output data workareas. For in-place
	 * operations we need to set the dma direction to BIDIRECTIONAL
	 * and copy the src workarea to the dst workarea.
	 */
	if (sg_virt(xts->src) == sg_virt(xts->dst))
		in_place = true;

	ret = ccp_init_data(&src, cmd_q, xts->src, xts->src_len,
			    unit_size,
			    in_place ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE);
	if (ret)
		goto e_ctx;

	if (in_place) {
		dst = src;
	} else {
		ret = ccp_init_data(&dst, cmd_q, xts->dst, xts->src_len,
				    unit_size, DMA_FROM_DEVICE);
		if (ret)
			goto e_src;
	}

	/* Send data to the CCP AES engine */
	while (src.sg_wa.bytes_left) {
		ccp_prepare_data(&src, &dst, &op, unit_size, true);
		if (!src.sg_wa.bytes_left)
			op.eom = 1;

		ret = ccp_perform_xts_aes(&op);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_dst;
		}

		ccp_process_data(&src, &dst, &op);
	}

	/* Retrieve the AES context - convert from LE to BE using
	 * 32-byte (256-bit) byteswapping
	 */
	ret = ccp_copy_from_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
				CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_dst;
	}

	/* ...but we only need AES_BLOCK_SIZE bytes */
	dm_offset = CCP_KSB_BYTES - AES_BLOCK_SIZE;
	ccp_get_dm_area(&ctx, dm_offset, xts->iv, 0, xts->iv_len);

e_dst:
	if (!in_place)
		ccp_free_data(&dst, cmd_q);

e_src:
	ccp_free_data(&src, cmd_q);

e_ctx:
	ccp_dm_free(&ctx);

e_key:
	ccp_dm_free(&key);

	return ret;
}

static int ccp_run_sha_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
	struct ccp_sha_engine *sha = &cmd->u.sha;
	struct ccp_dm_workarea ctx;
	struct ccp_data src;
	struct ccp_op op;
	int ret;

	if (sha->ctx_len != CCP_SHA_CTXSIZE)
		return -EINVAL;

	if (!sha->ctx)
		return -EINVAL;

	if (!sha->final && (sha->src_len & (CCP_SHA_BLOCKSIZE - 1)))
		return -EINVAL;

	if (!sha->src_len) {
		const u8 *sha_zero;

		/* Not final, just return */
		if (!sha->final)
			return 0;

		/* CCP can't do a zero length sha operation so the caller
		 * must buffer the data.
		 */
		if (sha->msg_bits)
			return -EINVAL;

		/* A sha operation for a message with a total length of zero,
		 * return known result.
		 */
		switch (sha->type) {
		case CCP_SHA_TYPE_1:
			sha_zero = ccp_sha1_zero;
			break;
		case CCP_SHA_TYPE_224:
			sha_zero = ccp_sha224_zero;
			break;
		case CCP_SHA_TYPE_256:
			sha_zero = ccp_sha256_zero;
			break;
		default:
			return -EINVAL;
		}

		scatterwalk_map_and_copy((void *)sha_zero, sha->ctx, 0,
					 sha->ctx_len, 1);

		return 0;
	}

	if (!sha->src)
		return -EINVAL;

	BUILD_BUG_ON(CCP_SHA_KSB_COUNT != 1);

	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);
	op.ksb_ctx = cmd_q->ksb_ctx;
	op.u.sha.type = sha->type;
	op.u.sha.msg_bits = sha->msg_bits;

	/* The SHA context fits in a single (32-byte) KSB entry and
	 * must be in little endian format. Use the 256-bit byte swap
	 * passthru option to convert from big endian to little endian.
	 */
	ret = ccp_init_dm_workarea(&ctx, cmd_q,
				   CCP_SHA_KSB_COUNT * CCP_KSB_BYTES,
				   DMA_BIDIRECTIONAL);
	if (ret)
		return ret;

	if (sha->first) {
		const __be32 *init;

		switch (sha->type) {
		case CCP_SHA_TYPE_1:
			init = ccp_sha1_init;
			break;
		case CCP_SHA_TYPE_224:
			init = ccp_sha224_init;
			break;
		case CCP_SHA_TYPE_256:
			init = ccp_sha256_init;
			break;
		default:
			ret = -EINVAL;
			goto e_ctx;
		}
		memcpy(ctx.address, init, CCP_SHA_CTXSIZE);
	} else {
		ccp_set_dm_area(&ctx, 0, sha->ctx, 0, sha->ctx_len);
	}

	ret = ccp_copy_to_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
			      CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_ctx;
	}

	/* Send data to the CCP SHA engine */
	ret = ccp_init_data(&src, cmd_q, sha->src, sha->src_len,
			    CCP_SHA_BLOCKSIZE, DMA_TO_DEVICE);
	if (ret)
		goto e_ctx;

	while (src.sg_wa.bytes_left) {
		ccp_prepare_data(&src, NULL, &op, CCP_SHA_BLOCKSIZE, false);
		if (sha->final && !src.sg_wa.bytes_left)
			op.eom = 1;

		ret = ccp_perform_sha(&op);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_data;
		}

		ccp_process_data(&src, NULL, &op);
	}

	/* Retrieve the SHA context - convert from LE to BE using
	 * 32-byte (256-bit) byteswapping to BE
	 */
	ret = ccp_copy_from_ksb(cmd_q, &ctx, op.jobid, op.ksb_ctx,
				CCP_PASSTHRU_BYTESWAP_256BIT);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_data;
	}

	ccp_get_dm_area(&ctx, 0, sha->ctx, 0, sha->ctx_len);

	if (sha->final && sha->opad) {
		/* HMAC operation, recursively perform final SHA */
		struct ccp_cmd hmac_cmd;
		struct scatterlist sg;
		u64 block_size, digest_size;
		u8 *hmac_buf;

		switch (sha->type) {
		case CCP_SHA_TYPE_1:
			block_size = SHA1_BLOCK_SIZE;
			digest_size = SHA1_DIGEST_SIZE;
			break;
		case CCP_SHA_TYPE_224:
			block_size = SHA224_BLOCK_SIZE;
			digest_size = SHA224_DIGEST_SIZE;
			break;
		case CCP_SHA_TYPE_256:
			block_size = SHA256_BLOCK_SIZE;
			digest_size = SHA256_DIGEST_SIZE;
			break;
		default:
			ret = -EINVAL;
			goto e_data;
		}

		if (sha->opad_len != block_size) {
			ret = -EINVAL;
			goto e_data;
		}

		hmac_buf = kmalloc(block_size + digest_size, GFP_KERNEL);
		if (!hmac_buf) {
			ret = -ENOMEM;
			goto e_data;
		}
		sg_init_one(&sg, hmac_buf, block_size + digest_size);

		scatterwalk_map_and_copy(hmac_buf, sha->opad, 0, block_size, 0);
		memcpy(hmac_buf + block_size, ctx.address, digest_size);

		memset(&hmac_cmd, 0, sizeof(hmac_cmd));
		hmac_cmd.engine = CCP_ENGINE_SHA;
		hmac_cmd.u.sha.type = sha->type;
		hmac_cmd.u.sha.ctx = sha->ctx;
		hmac_cmd.u.sha.ctx_len = sha->ctx_len;
		hmac_cmd.u.sha.src = &sg;
		hmac_cmd.u.sha.src_len = block_size + digest_size;
		hmac_cmd.u.sha.opad = NULL;
		hmac_cmd.u.sha.opad_len = 0;
		hmac_cmd.u.sha.first = 1;
		hmac_cmd.u.sha.final = 1;
		hmac_cmd.u.sha.msg_bits = (block_size + digest_size) << 3;

		ret = ccp_run_sha_cmd(cmd_q, &hmac_cmd);
		if (ret)
			cmd->engine_error = hmac_cmd.engine_error;

		kfree(hmac_buf);
	}

e_data:
	ccp_free_data(&src, cmd_q);

e_ctx:
	ccp_dm_free(&ctx);

	return ret;
}

static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
	struct ccp_rsa_engine *rsa = &cmd->u.rsa;
	struct ccp_dm_workarea exp, src;
	struct ccp_data dst;
	struct ccp_op op;
	unsigned int ksb_count, i_len, o_len;
	int ret;

	if (rsa->key_size > CCP_RSA_MAX_WIDTH)
		return -EINVAL;

	if (!rsa->exp || !rsa->mod || !rsa->src || !rsa->dst)
		return -EINVAL;

	/* The RSA modulus must precede the message being acted upon, so
	 * it must be copied to a DMA area where the message and the
	 * modulus can be concatenated.  Therefore the input buffer
	 * length required is twice the output buffer length (which
	 * must be a multiple of 256-bits).
	 */
	o_len = ((rsa->key_size + 255) / 256) * 32;
	i_len = o_len * 2;

	ksb_count = o_len / CCP_KSB_BYTES;

	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);
	op.ksb_key = ccp_alloc_ksb(cmd_q->ccp, ksb_count);
	if (!op.ksb_key)
		return -EIO;

	/* The RSA exponent may span multiple (32-byte) KSB entries and must
	 * be in little endian format. Reverse copy each 32-byte chunk
	 * of the exponent (En chunk to E0 chunk, E(n-1) chunk to E1 chunk)
	 * and each byte within that chunk and do not perform any byte swap
	 * operations on the passthru operation.
	 */
	ret = ccp_init_dm_workarea(&exp, cmd_q, o_len, DMA_TO_DEVICE);
	if (ret)
		goto e_ksb;

	ret = ccp_reverse_set_dm_area(&exp, rsa->exp, rsa->exp_len,
				      CCP_KSB_BYTES, false);
	if (ret)
		goto e_exp;
	ret = ccp_copy_to_ksb(cmd_q, &exp, op.jobid, op.ksb_key,
			      CCP_PASSTHRU_BYTESWAP_NOOP);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_exp;
	}

	/* Concatenate the modulus and the message. Both the modulus and
	 * the operands must be in little endian format.  Since the input
	 * is in big endian format it must be converted.
	 */
	ret = ccp_init_dm_workarea(&src, cmd_q, i_len, DMA_TO_DEVICE);
	if (ret)
		goto e_exp;

	ret = ccp_reverse_set_dm_area(&src, rsa->mod, rsa->mod_len,
				      CCP_KSB_BYTES, false);
	if (ret)
		goto e_src;
	src.address += o_len;	/* Adjust the address for the copy operation */
	ret = ccp_reverse_set_dm_area(&src, rsa->src, rsa->src_len,
				      CCP_KSB_BYTES, false);
	if (ret)
		goto e_src;
	src.address -= o_len;	/* Reset the address to original value */

	/* Prepare the output area for the operation */
	ret = ccp_init_data(&dst, cmd_q, rsa->dst, rsa->mod_len,
			    o_len, DMA_FROM_DEVICE);
	if (ret)
		goto e_src;

	op.soc = 1;
	op.src.u.dma.address = src.dma.address;
	op.src.u.dma.offset = 0;
	op.src.u.dma.length = i_len;
	op.dst.u.dma.address = dst.dm_wa.dma.address;
	op.dst.u.dma.offset = 0;
	op.dst.u.dma.length = o_len;

	op.u.rsa.mod_size = rsa->key_size;
	op.u.rsa.input_len = i_len;

	ret = ccp_perform_rsa(&op);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_dst;
	}

	ccp_reverse_get_dm_area(&dst.dm_wa, rsa->dst, rsa->mod_len);

e_dst:
	ccp_free_data(&dst, cmd_q);

e_src:
	ccp_dm_free(&src);

e_exp:
	ccp_dm_free(&exp);

e_ksb:
	ccp_free_ksb(cmd_q->ccp, op.ksb_key, ksb_count);

	return ret;
}

static int ccp_run_passthru_cmd(struct ccp_cmd_queue *cmd_q,
				struct ccp_cmd *cmd)
{
	struct ccp_passthru_engine *pt = &cmd->u.passthru;
	struct ccp_dm_workarea mask;
	struct ccp_data src, dst;
	struct ccp_op op;
	bool in_place = false;
	unsigned int i;
	int ret;

	if (!pt->final && (pt->src_len & (CCP_PASSTHRU_BLOCKSIZE - 1)))
		return -EINVAL;

	if (!pt->src || !pt->dst)
		return -EINVAL;

	if (pt->bit_mod != CCP_PASSTHRU_BITWISE_NOOP) {
		if (pt->mask_len != CCP_PASSTHRU_MASKSIZE)
			return -EINVAL;
		if (!pt->mask)
			return -EINVAL;
	}

	BUILD_BUG_ON(CCP_PASSTHRU_KSB_COUNT != 1);

	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);

	if (pt->bit_mod != CCP_PASSTHRU_BITWISE_NOOP) {
		/* Load the mask */
		op.ksb_key = cmd_q->ksb_key;

		ret = ccp_init_dm_workarea(&mask, cmd_q,
					   CCP_PASSTHRU_KSB_COUNT *
					   CCP_KSB_BYTES,
					   DMA_TO_DEVICE);
		if (ret)
			return ret;

		ccp_set_dm_area(&mask, 0, pt->mask, 0, pt->mask_len);
		ret = ccp_copy_to_ksb(cmd_q, &mask, op.jobid, op.ksb_key,
				      CCP_PASSTHRU_BYTESWAP_NOOP);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_mask;
		}
	}

	/* Prepare the input and output data workareas. For in-place
	 * operations we need to set the dma direction to BIDIRECTIONAL
	 * and copy the src workarea to the dst workarea.
	 */
	if (sg_virt(pt->src) == sg_virt(pt->dst))
		in_place = true;

	ret = ccp_init_data(&src, cmd_q, pt->src, pt->src_len,
			    CCP_PASSTHRU_MASKSIZE,
			    in_place ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE);
	if (ret)
		goto e_mask;

	if (in_place) {
		dst = src;
	} else {
		ret = ccp_init_data(&dst, cmd_q, pt->dst, pt->src_len,
				    CCP_PASSTHRU_MASKSIZE, DMA_FROM_DEVICE);
		if (ret)
			goto e_src;
	}

	/* Send data to the CCP Passthru engine
	 *   Because the CCP engine works on a single source and destination
	 *   dma address at a time, each entry in the source scatterlist
	 *   (after the dma_map_sg call) must be less than or equal to the
	 *   (remaining) length in the destination scatterlist entry and the
	 *   length must be a multiple of CCP_PASSTHRU_BLOCKSIZE
	 */
	dst.sg_wa.sg_used = 0;
	for (i = 1; i <= src.sg_wa.dma_count; i++) {
		if (!dst.sg_wa.sg ||
		    (dst.sg_wa.sg->length < src.sg_wa.sg->length)) {
			ret = -EINVAL;
			goto e_dst;
		}

		if (i == src.sg_wa.dma_count) {
			op.eom = 1;
			op.soc = 1;
		}

		op.src.type = CCP_MEMTYPE_SYSTEM;
		op.src.u.dma.address = sg_dma_address(src.sg_wa.sg);
		op.src.u.dma.offset = 0;
		op.src.u.dma.length = sg_dma_len(src.sg_wa.sg);

		op.dst.type = CCP_MEMTYPE_SYSTEM;
		op.dst.u.dma.address = sg_dma_address(dst.sg_wa.sg);
		op.dst.u.dma.offset = dst.sg_wa.sg_used;
		op.dst.u.dma.length = op.src.u.dma.length;

		ret = ccp_perform_passthru(&op);
		if (ret) {
			cmd->engine_error = cmd_q->cmd_error;
			goto e_dst;
		}

		dst.sg_wa.sg_used += src.sg_wa.sg->length;
		if (dst.sg_wa.sg_used == dst.sg_wa.sg->length) {
			dst.sg_wa.sg = sg_next(dst.sg_wa.sg);
			dst.sg_wa.sg_used = 0;
		}
		src.sg_wa.sg = sg_next(src.sg_wa.sg);
	}

e_dst:
	if (!in_place)
		ccp_free_data(&dst, cmd_q);

e_src:
	ccp_free_data(&src, cmd_q);

e_mask:
	if (pt->bit_mod != CCP_PASSTHRU_BITWISE_NOOP)
		ccp_dm_free(&mask);

	return ret;
}

static int ccp_run_ecc_mm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
	struct ccp_ecc_engine *ecc = &cmd->u.ecc;
	struct ccp_dm_workarea src, dst;
	struct ccp_op op;
	int ret;
	u8 *save;

	if (!ecc->u.mm.operand_1 ||
	    (ecc->u.mm.operand_1_len > CCP_ECC_MODULUS_BYTES))
		return -EINVAL;

	if (ecc->function != CCP_ECC_FUNCTION_MINV_384BIT)
		if (!ecc->u.mm.operand_2 ||
		    (ecc->u.mm.operand_2_len > CCP_ECC_MODULUS_BYTES))
			return -EINVAL;

	if (!ecc->u.mm.result ||
	    (ecc->u.mm.result_len < CCP_ECC_MODULUS_BYTES))
		return -EINVAL;

	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);

	/* Concatenate the modulus and the operands. Both the modulus and
	 * the operands must be in little endian format.  Since the input
	 * is in big endian format it must be converted and placed in a
	 * fixed length buffer.
	 */
	ret = ccp_init_dm_workarea(&src, cmd_q, CCP_ECC_SRC_BUF_SIZE,
				   DMA_TO_DEVICE);
	if (ret)
		return ret;

	/* Save the workarea address since it is updated in order to perform
	 * the concatenation
	 */
	save = src.address;

	/* Copy the ECC modulus */
	ret = ccp_reverse_set_dm_area(&src, ecc->mod, ecc->mod_len,
				      CCP_ECC_OPERAND_SIZE, false);
	if (ret)
		goto e_src;
	src.address += CCP_ECC_OPERAND_SIZE;

	/* Copy the first operand */
	ret = ccp_reverse_set_dm_area(&src, ecc->u.mm.operand_1,
				      ecc->u.mm.operand_1_len,
				      CCP_ECC_OPERAND_SIZE, false);
	if (ret)
		goto e_src;
	src.address += CCP_ECC_OPERAND_SIZE;

	if (ecc->function != CCP_ECC_FUNCTION_MINV_384BIT) {
		/* Copy the second operand */
		ret = ccp_reverse_set_dm_area(&src, ecc->u.mm.operand_2,
					      ecc->u.mm.operand_2_len,
					      CCP_ECC_OPERAND_SIZE, false);
		if (ret)
			goto e_src;
		src.address += CCP_ECC_OPERAND_SIZE;
	}

	/* Restore the workarea address */
	src.address = save;

	/* Prepare the output area for the operation */
	ret = ccp_init_dm_workarea(&dst, cmd_q, CCP_ECC_DST_BUF_SIZE,
				   DMA_FROM_DEVICE);
	if (ret)
		goto e_src;

	op.soc = 1;
	op.src.u.dma.address = src.dma.address;
	op.src.u.dma.offset = 0;
	op.src.u.dma.length = src.length;
	op.dst.u.dma.address = dst.dma.address;
	op.dst.u.dma.offset = 0;
	op.dst.u.dma.length = dst.length;

	op.u.ecc.function = cmd->u.ecc.function;

	ret = ccp_perform_ecc(&op);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_dst;
	}

	ecc->ecc_result = le16_to_cpup(
		(const __le16 *)(dst.address + CCP_ECC_RESULT_OFFSET));
	if (!(ecc->ecc_result & CCP_ECC_RESULT_SUCCESS)) {
		ret = -EIO;
		goto e_dst;
	}

	/* Save the ECC result */
	ccp_reverse_get_dm_area(&dst, ecc->u.mm.result, CCP_ECC_MODULUS_BYTES);

e_dst:
	ccp_dm_free(&dst);

e_src:
	ccp_dm_free(&src);

	return ret;
}

static int ccp_run_ecc_pm_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
	struct ccp_ecc_engine *ecc = &cmd->u.ecc;
	struct ccp_dm_workarea src, dst;
	struct ccp_op op;
	int ret;
	u8 *save;

	if (!ecc->u.pm.point_1.x ||
	    (ecc->u.pm.point_1.x_len > CCP_ECC_MODULUS_BYTES) ||
	    !ecc->u.pm.point_1.y ||
	    (ecc->u.pm.point_1.y_len > CCP_ECC_MODULUS_BYTES))
		return -EINVAL;

	if (ecc->function == CCP_ECC_FUNCTION_PADD_384BIT) {
		if (!ecc->u.pm.point_2.x ||
		    (ecc->u.pm.point_2.x_len > CCP_ECC_MODULUS_BYTES) ||
		    !ecc->u.pm.point_2.y ||
		    (ecc->u.pm.point_2.y_len > CCP_ECC_MODULUS_BYTES))
			return -EINVAL;
	} else {
		if (!ecc->u.pm.domain_a ||
		    (ecc->u.pm.domain_a_len > CCP_ECC_MODULUS_BYTES))
			return -EINVAL;

		if (ecc->function == CCP_ECC_FUNCTION_PMUL_384BIT)
			if (!ecc->u.pm.scalar ||
			    (ecc->u.pm.scalar_len > CCP_ECC_MODULUS_BYTES))
				return -EINVAL;
	}

	if (!ecc->u.pm.result.x ||
	    (ecc->u.pm.result.x_len < CCP_ECC_MODULUS_BYTES) ||
	    !ecc->u.pm.result.y ||
	    (ecc->u.pm.result.y_len < CCP_ECC_MODULUS_BYTES))
		return -EINVAL;

	memset(&op, 0, sizeof(op));
	op.cmd_q = cmd_q;
	op.jobid = ccp_gen_jobid(cmd_q->ccp);

	/* Concatenate the modulus and the operands. Both the modulus and
	 * the operands must be in little endian format.  Since the input
	 * is in big endian format it must be converted and placed in a
	 * fixed length buffer.
	 */
	ret = ccp_init_dm_workarea(&src, cmd_q, CCP_ECC_SRC_BUF_SIZE,
				   DMA_TO_DEVICE);
	if (ret)
		return ret;

	/* Save the workarea address since it is updated in order to perform
	 * the concatenation
	 */
	save = src.address;

	/* Copy the ECC modulus */
	ret = ccp_reverse_set_dm_area(&src, ecc->mod, ecc->mod_len,
				      CCP_ECC_OPERAND_SIZE, false);
	if (ret)
		goto e_src;
	src.address += CCP_ECC_OPERAND_SIZE;

	/* Copy the first point X and Y coordinate */
	ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_1.x,
				      ecc->u.pm.point_1.x_len,
				      CCP_ECC_OPERAND_SIZE, false);
	if (ret)
		goto e_src;
	src.address += CCP_ECC_OPERAND_SIZE;
	ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_1.y,
				      ecc->u.pm.point_1.y_len,
				      CCP_ECC_OPERAND_SIZE, false);
	if (ret)
		goto e_src;
	src.address += CCP_ECC_OPERAND_SIZE;

	/* Set the first point Z coordianate to 1 */
	*src.address = 0x01;
	src.address += CCP_ECC_OPERAND_SIZE;

	if (ecc->function == CCP_ECC_FUNCTION_PADD_384BIT) {
		/* Copy the second point X and Y coordinate */
		ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_2.x,
					      ecc->u.pm.point_2.x_len,
					      CCP_ECC_OPERAND_SIZE, false);
		if (ret)
			goto e_src;
		src.address += CCP_ECC_OPERAND_SIZE;
		ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.point_2.y,
					      ecc->u.pm.point_2.y_len,
					      CCP_ECC_OPERAND_SIZE, false);
		if (ret)
			goto e_src;
		src.address += CCP_ECC_OPERAND_SIZE;

		/* Set the second point Z coordianate to 1 */
		*src.address = 0x01;
		src.address += CCP_ECC_OPERAND_SIZE;
	} else {
		/* Copy the Domain "a" parameter */
		ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.domain_a,
					      ecc->u.pm.domain_a_len,
					      CCP_ECC_OPERAND_SIZE, false);
		if (ret)
			goto e_src;
		src.address += CCP_ECC_OPERAND_SIZE;

		if (ecc->function == CCP_ECC_FUNCTION_PMUL_384BIT) {
			/* Copy the scalar value */
			ret = ccp_reverse_set_dm_area(&src, ecc->u.pm.scalar,
						      ecc->u.pm.scalar_len,
						      CCP_ECC_OPERAND_SIZE,
						      false);
			if (ret)
				goto e_src;
			src.address += CCP_ECC_OPERAND_SIZE;
		}
	}

	/* Restore the workarea address */
	src.address = save;

	/* Prepare the output area for the operation */
	ret = ccp_init_dm_workarea(&dst, cmd_q, CCP_ECC_DST_BUF_SIZE,
				   DMA_FROM_DEVICE);
	if (ret)
		goto e_src;

	op.soc = 1;
	op.src.u.dma.address = src.dma.address;
	op.src.u.dma.offset = 0;
	op.src.u.dma.length = src.length;
	op.dst.u.dma.address = dst.dma.address;
	op.dst.u.dma.offset = 0;
	op.dst.u.dma.length = dst.length;

	op.u.ecc.function = cmd->u.ecc.function;

	ret = ccp_perform_ecc(&op);
	if (ret) {
		cmd->engine_error = cmd_q->cmd_error;
		goto e_dst;
	}

	ecc->ecc_result = le16_to_cpup(
		(const __le16 *)(dst.address + CCP_ECC_RESULT_OFFSET));
	if (!(ecc->ecc_result & CCP_ECC_RESULT_SUCCESS)) {
		ret = -EIO;
		goto e_dst;
	}

	/* Save the workarea address since it is updated as we walk through
	 * to copy the point math result
	 */
	save = dst.address;

	/* Save the ECC result X and Y coordinates */
	ccp_reverse_get_dm_area(&dst, ecc->u.pm.result.x,
				CCP_ECC_MODULUS_BYTES);
	dst.address += CCP_ECC_OUTPUT_SIZE;
	ccp_reverse_get_dm_area(&dst, ecc->u.pm.result.y,
				CCP_ECC_MODULUS_BYTES);
	dst.address += CCP_ECC_OUTPUT_SIZE;

	/* Restore the workarea address */
	dst.address = save;

e_dst:
	ccp_dm_free(&dst);

e_src:
	ccp_dm_free(&src);

	return ret;
}

static int ccp_run_ecc_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
	struct ccp_ecc_engine *ecc = &cmd->u.ecc;

	ecc->ecc_result = 0;

	if (!ecc->mod ||
	    (ecc->mod_len > CCP_ECC_MODULUS_BYTES))
		return -EINVAL;

	switch (ecc->function) {
	case CCP_ECC_FUNCTION_MMUL_384BIT:
	case CCP_ECC_FUNCTION_MADD_384BIT:
	case CCP_ECC_FUNCTION_MINV_384BIT:
		return ccp_run_ecc_mm_cmd(cmd_q, cmd);

	case CCP_ECC_FUNCTION_PADD_384BIT:
	case CCP_ECC_FUNCTION_PMUL_384BIT:
	case CCP_ECC_FUNCTION_PDBL_384BIT:
		return ccp_run_ecc_pm_cmd(cmd_q, cmd);

	default:
		return -EINVAL;
	}
}

int ccp_run_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
{
	int ret;

	cmd->engine_error = 0;
	cmd_q->cmd_error = 0;
	cmd_q->int_rcvd = 0;
	cmd_q->free_slots = CMD_Q_DEPTH(ioread32(cmd_q->reg_status));

	switch (cmd->engine) {
	case CCP_ENGINE_AES:
		ret = ccp_run_aes_cmd(cmd_q, cmd);
		break;
	case CCP_ENGINE_XTS_AES_128:
		ret = ccp_run_xts_aes_cmd(cmd_q, cmd);
		break;
	case CCP_ENGINE_SHA:
		ret = ccp_run_sha_cmd(cmd_q, cmd);
		break;
	case CCP_ENGINE_RSA:
		ret = ccp_run_rsa_cmd(cmd_q, cmd);
		break;
	case CCP_ENGINE_PASSTHRU:
		ret = ccp_run_passthru_cmd(cmd_q, cmd);
		break;
	case CCP_ENGINE_ECC:
		ret = ccp_run_ecc_cmd(cmd_q, cmd);
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}