summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/hfi1/firmware.c
blob: 13db8eb4f4ece1949e699c9e8b509a4fa70598a0 (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
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
/*
 * Copyright(c) 2015, 2016 Intel Corporation.
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * BSD LICENSE
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  - Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  - Neither the name of Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <linux/firmware.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/crc32.h>

#include "hfi.h"
#include "trace.h"

/*
 * Make it easy to toggle firmware file name and if it gets loaded by
 * editing the following. This may be something we do while in development
 * but not necessarily something a user would ever need to use.
 */
#define DEFAULT_FW_8051_NAME_FPGA "hfi_dc8051.bin"
#define DEFAULT_FW_8051_NAME_ASIC "hfi1_dc8051.fw"
#define DEFAULT_FW_FABRIC_NAME "hfi1_fabric.fw"
#define DEFAULT_FW_SBUS_NAME "hfi1_sbus.fw"
#define DEFAULT_FW_PCIE_NAME "hfi1_pcie.fw"
#define DEFAULT_PLATFORM_CONFIG_NAME "hfi1_platform.dat"
#define ALT_FW_8051_NAME_ASIC "hfi1_dc8051_d.fw"
#define ALT_FW_FABRIC_NAME "hfi1_fabric_d.fw"
#define ALT_FW_SBUS_NAME "hfi1_sbus_d.fw"
#define ALT_FW_PCIE_NAME "hfi1_pcie_d.fw"

static uint fw_8051_load = 1;
static uint fw_fabric_serdes_load = 1;
static uint fw_pcie_serdes_load = 1;
static uint fw_sbus_load = 1;

/*
 * Access required in platform.c
 * Maintains state of whether the platform config was fetched via the
 * fallback option
 */
uint platform_config_load;

/* Firmware file names get set in hfi1_firmware_init() based on the above */
static char *fw_8051_name;
static char *fw_fabric_serdes_name;
static char *fw_sbus_name;
static char *fw_pcie_serdes_name;
static char *platform_config_name;

#define SBUS_MAX_POLL_COUNT 100
#define SBUS_COUNTER(reg, name) \
	(((reg) >> ASIC_STS_SBUS_COUNTERS_##name##_CNT_SHIFT) & \
	 ASIC_STS_SBUS_COUNTERS_##name##_CNT_MASK)

/*
 * Firmware security header.
 */
struct css_header {
	u32 module_type;
	u32 header_len;
	u32 header_version;
	u32 module_id;
	u32 module_vendor;
	u32 date;		/* BCD yyyymmdd */
	u32 size;		/* in DWORDs */
	u32 key_size;		/* in DWORDs */
	u32 modulus_size;	/* in DWORDs */
	u32 exponent_size;	/* in DWORDs */
	u32 reserved[22];
};

/* expected field values */
#define CSS_MODULE_TYPE	   0x00000006
#define CSS_HEADER_LEN	   0x000000a1
#define CSS_HEADER_VERSION 0x00010000
#define CSS_MODULE_VENDOR  0x00008086

#define KEY_SIZE      256
#define MU_SIZE		8
#define EXPONENT_SIZE	4

/* the file itself */
struct firmware_file {
	struct css_header css_header;
	u8 modulus[KEY_SIZE];
	u8 exponent[EXPONENT_SIZE];
	u8 signature[KEY_SIZE];
	u8 firmware[];
};

struct augmented_firmware_file {
	struct css_header css_header;
	u8 modulus[KEY_SIZE];
	u8 exponent[EXPONENT_SIZE];
	u8 signature[KEY_SIZE];
	u8 r2[KEY_SIZE];
	u8 mu[MU_SIZE];
	u8 firmware[];
};

/* augmented file size difference */
#define AUGMENT_SIZE (sizeof(struct augmented_firmware_file) - \
						sizeof(struct firmware_file))

struct firmware_details {
	/* Linux core piece */
	const struct firmware *fw;

	struct css_header *css_header;
	u8 *firmware_ptr;		/* pointer to binary data */
	u32 firmware_len;		/* length in bytes */
	u8 *modulus;			/* pointer to the modulus */
	u8 *exponent;			/* pointer to the exponent */
	u8 *signature;			/* pointer to the signature */
	u8 *r2;				/* pointer to r2 */
	u8 *mu;				/* pointer to mu */
	struct augmented_firmware_file dummy_header;
};

/*
 * The mutex protects fw_state, fw_err, and all of the firmware_details
 * variables.
 */
static DEFINE_MUTEX(fw_mutex);
enum fw_state {
	FW_EMPTY,
	FW_TRY,
	FW_FINAL,
	FW_ERR
};

static enum fw_state fw_state = FW_EMPTY;
static int fw_err;
static struct firmware_details fw_8051;
static struct firmware_details fw_fabric;
static struct firmware_details fw_pcie;
static struct firmware_details fw_sbus;
static const struct firmware *platform_config;

/* flags for turn_off_spicos() */
#define SPICO_SBUS   0x1
#define SPICO_FABRIC 0x2
#define ENABLE_SPICO_SMASK 0x1

/* security block commands */
#define RSA_CMD_INIT  0x1
#define RSA_CMD_START 0x2

/* security block status */
#define RSA_STATUS_IDLE   0x0
#define RSA_STATUS_ACTIVE 0x1
#define RSA_STATUS_DONE   0x2
#define RSA_STATUS_FAILED 0x3

/* RSA engine timeout, in ms */
#define RSA_ENGINE_TIMEOUT 100 /* ms */

/* hardware mutex timeout, in ms */
#define HM_TIMEOUT 10 /* ms */

/* 8051 memory access timeout, in us */
#define DC8051_ACCESS_TIMEOUT 100 /* us */

/* the number of fabric SerDes on the SBus */
#define NUM_FABRIC_SERDES 4

/* ASIC_STS_SBUS_RESULT.RESULT_CODE value */
#define SBUS_READ_COMPLETE 0x4

/* SBus fabric SerDes addresses, one set per HFI */
static const u8 fabric_serdes_addrs[2][NUM_FABRIC_SERDES] = {
	{ 0x01, 0x02, 0x03, 0x04 },
	{ 0x28, 0x29, 0x2a, 0x2b }
};

/* SBus PCIe SerDes addresses, one set per HFI */
static const u8 pcie_serdes_addrs[2][NUM_PCIE_SERDES] = {
	{ 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16,
	  0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26 },
	{ 0x2f, 0x31, 0x33, 0x35, 0x37, 0x39, 0x3b, 0x3d,
	  0x3f, 0x41, 0x43, 0x45, 0x47, 0x49, 0x4b, 0x4d }
};

/* SBus PCIe PCS addresses, one set per HFI */
const u8 pcie_pcs_addrs[2][NUM_PCIE_SERDES] = {
	{ 0x09, 0x0b, 0x0d, 0x0f, 0x11, 0x13, 0x15, 0x17,
	  0x19, 0x1b, 0x1d, 0x1f, 0x21, 0x23, 0x25, 0x27 },
	{ 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e,
	  0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e }
};

/* SBus fabric SerDes broadcast addresses, one per HFI */
static const u8 fabric_serdes_broadcast[2] = { 0xe4, 0xe5 };
static const u8 all_fabric_serdes_broadcast = 0xe1;

/* SBus PCIe SerDes broadcast addresses, one per HFI */
const u8 pcie_serdes_broadcast[2] = { 0xe2, 0xe3 };
static const u8 all_pcie_serdes_broadcast = 0xe0;

/* forwards */
static void dispose_one_firmware(struct firmware_details *fdet);
static int load_fabric_serdes_firmware(struct hfi1_devdata *dd,
				       struct firmware_details *fdet);
static void dump_fw_version(struct hfi1_devdata *dd);

/*
 * Read a single 64-bit value from 8051 data memory.
 *
 * Expects:
 * o caller to have already set up data read, no auto increment
 * o caller to turn off read enable when finished
 *
 * The address argument is a byte offset.  Bits 0:2 in the address are
 * ignored - i.e. the hardware will always do aligned 8-byte reads as if
 * the lower bits are zero.
 *
 * Return 0 on success, -ENXIO on a read error (timeout).
 */
static int __read_8051_data(struct hfi1_devdata *dd, u32 addr, u64 *result)
{
	u64 reg;
	int count;

	/* start the read at the given address */
	reg = ((addr & DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_MASK)
			<< DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_SHIFT)
		| DC_DC8051_CFG_RAM_ACCESS_CTRL_READ_ENA_SMASK;
	write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL, reg);

	/* wait until ACCESS_COMPLETED is set */
	count = 0;
	while ((read_csr(dd, DC_DC8051_CFG_RAM_ACCESS_STATUS)
		    & DC_DC8051_CFG_RAM_ACCESS_STATUS_ACCESS_COMPLETED_SMASK)
		    == 0) {
		count++;
		if (count > DC8051_ACCESS_TIMEOUT) {
			dd_dev_err(dd, "timeout reading 8051 data\n");
			return -ENXIO;
		}
		ndelay(10);
	}

	/* gather the data */
	*result = read_csr(dd, DC_DC8051_CFG_RAM_ACCESS_RD_DATA);

	return 0;
}

/*
 * Read 8051 data starting at addr, for len bytes.  Will read in 8-byte chunks.
 * Return 0 on success, -errno on error.
 */
int read_8051_data(struct hfi1_devdata *dd, u32 addr, u32 len, u64 *result)
{
	unsigned long flags;
	u32 done;
	int ret = 0;

	spin_lock_irqsave(&dd->dc8051_memlock, flags);

	/* data read set-up, no auto-increment */
	write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_SETUP, 0);

	for (done = 0; done < len; addr += 8, done += 8, result++) {
		ret = __read_8051_data(dd, addr, result);
		if (ret)
			break;
	}

	/* turn off read enable */
	write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL, 0);

	spin_unlock_irqrestore(&dd->dc8051_memlock, flags);

	return ret;
}

/*
 * Write data or code to the 8051 code or data RAM.
 */
static int write_8051(struct hfi1_devdata *dd, int code, u32 start,
		      const u8 *data, u32 len)
{
	u64 reg;
	u32 offset;
	int aligned, count;

	/* check alignment */
	aligned = ((unsigned long)data & 0x7) == 0;

	/* write set-up */
	reg = (code ? DC_DC8051_CFG_RAM_ACCESS_SETUP_RAM_SEL_SMASK : 0ull)
		| DC_DC8051_CFG_RAM_ACCESS_SETUP_AUTO_INCR_ADDR_SMASK;
	write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_SETUP, reg);

	reg = ((start & DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_MASK)
			<< DC_DC8051_CFG_RAM_ACCESS_CTRL_ADDRESS_SHIFT)
		| DC_DC8051_CFG_RAM_ACCESS_CTRL_WRITE_ENA_SMASK;
	write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL, reg);

	/* write */
	for (offset = 0; offset < len; offset += 8) {
		int bytes = len - offset;

		if (bytes < 8) {
			reg = 0;
			memcpy(&reg, &data[offset], bytes);
		} else if (aligned) {
			reg = *(u64 *)&data[offset];
		} else {
			memcpy(&reg, &data[offset], 8);
		}
		write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_WR_DATA, reg);

		/* wait until ACCESS_COMPLETED is set */
		count = 0;
		while ((read_csr(dd, DC_DC8051_CFG_RAM_ACCESS_STATUS)
		    & DC_DC8051_CFG_RAM_ACCESS_STATUS_ACCESS_COMPLETED_SMASK)
		    == 0) {
			count++;
			if (count > DC8051_ACCESS_TIMEOUT) {
				dd_dev_err(dd, "timeout writing 8051 data\n");
				return -ENXIO;
			}
			udelay(1);
		}
	}

	/* turn off write access, auto increment (also sets to data access) */
	write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_CTRL, 0);
	write_csr(dd, DC_DC8051_CFG_RAM_ACCESS_SETUP, 0);

	return 0;
}

/* return 0 if values match, non-zero and complain otherwise */
static int invalid_header(struct hfi1_devdata *dd, const char *what,
			  u32 actual, u32 expected)
{
	if (actual == expected)
		return 0;

	dd_dev_err(dd,
		   "invalid firmware header field %s: expected 0x%x, actual 0x%x\n",
		   what, expected, actual);
	return 1;
}

/*
 * Verify that the static fields in the CSS header match.
 */
static int verify_css_header(struct hfi1_devdata *dd, struct css_header *css)
{
	/* verify CSS header fields (most sizes are in DW, so add /4) */
	if (invalid_header(dd, "module_type", css->module_type,
			   CSS_MODULE_TYPE) ||
	    invalid_header(dd, "header_len", css->header_len,
			   (sizeof(struct firmware_file) / 4)) ||
	    invalid_header(dd, "header_version", css->header_version,
			   CSS_HEADER_VERSION) ||
	    invalid_header(dd, "module_vendor", css->module_vendor,
			   CSS_MODULE_VENDOR) ||
	    invalid_header(dd, "key_size", css->key_size, KEY_SIZE / 4) ||
	    invalid_header(dd, "modulus_size", css->modulus_size,
			   KEY_SIZE / 4) ||
	    invalid_header(dd, "exponent_size", css->exponent_size,
			   EXPONENT_SIZE / 4)) {
		return -EINVAL;
	}
	return 0;
}

/*
 * Make sure there are at least some bytes after the prefix.
 */
static int payload_check(struct hfi1_devdata *dd, const char *name,
			 long file_size, long prefix_size)
{
	/* make sure we have some payload */
	if (prefix_size >= file_size) {
		dd_dev_err(dd,
			   "firmware \"%s\", size %ld, must be larger than %ld bytes\n",
			   name, file_size, prefix_size);
		return -EINVAL;
	}

	return 0;
}

/*
 * Request the firmware from the system.  Extract the pieces and fill in
 * fdet.  If successful, the caller will need to call dispose_one_firmware().
 * Returns 0 on success, -ERRNO on error.
 */
static int obtain_one_firmware(struct hfi1_devdata *dd, const char *name,
			       struct firmware_details *fdet)
{
	struct css_header *css;
	int ret;

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

	ret = request_firmware(&fdet->fw, name, &dd->pcidev->dev);
	if (ret) {
		dd_dev_warn(dd, "cannot find firmware \"%s\", err %d\n",
			    name, ret);
		return ret;
	}

	/* verify the firmware */
	if (fdet->fw->size < sizeof(struct css_header)) {
		dd_dev_err(dd, "firmware \"%s\" is too small\n", name);
		ret = -EINVAL;
		goto done;
	}
	css = (struct css_header *)fdet->fw->data;

	hfi1_cdbg(FIRMWARE, "Firmware %s details:", name);
	hfi1_cdbg(FIRMWARE, "file size: 0x%lx bytes", fdet->fw->size);
	hfi1_cdbg(FIRMWARE, "CSS structure:");
	hfi1_cdbg(FIRMWARE, "  module_type    0x%x", css->module_type);
	hfi1_cdbg(FIRMWARE, "  header_len     0x%03x (0x%03x bytes)",
		  css->header_len, 4 * css->header_len);
	hfi1_cdbg(FIRMWARE, "  header_version 0x%x", css->header_version);
	hfi1_cdbg(FIRMWARE, "  module_id      0x%x", css->module_id);
	hfi1_cdbg(FIRMWARE, "  module_vendor  0x%x", css->module_vendor);
	hfi1_cdbg(FIRMWARE, "  date           0x%x", css->date);
	hfi1_cdbg(FIRMWARE, "  size           0x%03x (0x%03x bytes)",
		  css->size, 4 * css->size);
	hfi1_cdbg(FIRMWARE, "  key_size       0x%03x (0x%03x bytes)",
		  css->key_size, 4 * css->key_size);
	hfi1_cdbg(FIRMWARE, "  modulus_size   0x%03x (0x%03x bytes)",
		  css->modulus_size, 4 * css->modulus_size);
	hfi1_cdbg(FIRMWARE, "  exponent_size  0x%03x (0x%03x bytes)",
		  css->exponent_size, 4 * css->exponent_size);
	hfi1_cdbg(FIRMWARE, "firmware size: 0x%lx bytes",
		  fdet->fw->size - sizeof(struct firmware_file));

	/*
	 * If the file does not have a valid CSS header, fail.
	 * Otherwise, check the CSS size field for an expected size.
	 * The augmented file has r2 and mu inserted after the header
	 * was generated, so there will be a known difference between
	 * the CSS header size and the actual file size.  Use this
	 * difference to identify an augmented file.
	 *
	 * Note: css->size is in DWORDs, multiply by 4 to get bytes.
	 */
	ret = verify_css_header(dd, css);
	if (ret) {
		dd_dev_info(dd, "Invalid CSS header for \"%s\"\n", name);
	} else if ((css->size * 4) == fdet->fw->size) {
		/* non-augmented firmware file */
		struct firmware_file *ff = (struct firmware_file *)
							fdet->fw->data;

		/* make sure there are bytes in the payload */
		ret = payload_check(dd, name, fdet->fw->size,
				    sizeof(struct firmware_file));
		if (ret == 0) {
			fdet->css_header = css;
			fdet->modulus = ff->modulus;
			fdet->exponent = ff->exponent;
			fdet->signature = ff->signature;
			fdet->r2 = fdet->dummy_header.r2; /* use dummy space */
			fdet->mu = fdet->dummy_header.mu; /* use dummy space */
			fdet->firmware_ptr = ff->firmware;
			fdet->firmware_len = fdet->fw->size -
						sizeof(struct firmware_file);
			/*
			 * Header does not include r2 and mu - generate here.
			 * For now, fail.
			 */
			dd_dev_err(dd, "driver is unable to validate firmware without r2 and mu (not in firmware file)\n");
			ret = -EINVAL;
		}
	} else if ((css->size * 4) + AUGMENT_SIZE == fdet->fw->size) {
		/* augmented firmware file */
		struct augmented_firmware_file *aff =
			(struct augmented_firmware_file *)fdet->fw->data;

		/* make sure there are bytes in the payload */
		ret = payload_check(dd, name, fdet->fw->size,
				    sizeof(struct augmented_firmware_file));
		if (ret == 0) {
			fdet->css_header = css;
			fdet->modulus = aff->modulus;
			fdet->exponent = aff->exponent;
			fdet->signature = aff->signature;
			fdet->r2 = aff->r2;
			fdet->mu = aff->mu;
			fdet->firmware_ptr = aff->firmware;
			fdet->firmware_len = fdet->fw->size -
					sizeof(struct augmented_firmware_file);
		}
	} else {
		/* css->size check failed */
		dd_dev_err(dd,
			   "invalid firmware header field size: expected 0x%lx or 0x%lx, actual 0x%x\n",
			   fdet->fw->size / 4,
			   (fdet->fw->size - AUGMENT_SIZE) / 4,
			   css->size);

		ret = -EINVAL;
	}

done:
	/* if returning an error, clean up after ourselves */
	if (ret)
		dispose_one_firmware(fdet);
	return ret;
}

static void dispose_one_firmware(struct firmware_details *fdet)
{
	release_firmware(fdet->fw);
	/* erase all previous information */
	memset(fdet, 0, sizeof(*fdet));
}

/*
 * Obtain the 4 firmwares from the OS.  All must be obtained at once or not
 * at all.  If called with the firmware state in FW_TRY, use alternate names.
 * On exit, this routine will have set the firmware state to one of FW_TRY,
 * FW_FINAL, or FW_ERR.
 *
 * Must be holding fw_mutex.
 */
static void __obtain_firmware(struct hfi1_devdata *dd)
{
	int err = 0;

	if (fw_state == FW_FINAL)	/* nothing more to obtain */
		return;
	if (fw_state == FW_ERR)		/* already in error */
		return;

	/* fw_state is FW_EMPTY or FW_TRY */
retry:
	if (fw_state == FW_TRY) {
		/*
		 * We tried the original and it failed.  Move to the
		 * alternate.
		 */
		dd_dev_warn(dd, "using alternate firmware names\n");
		/*
		 * Let others run.  Some systems, when missing firmware, does
		 * something that holds for 30 seconds.  If we do that twice
		 * in a row it triggers task blocked warning.
		 */
		cond_resched();
		if (fw_8051_load)
			dispose_one_firmware(&fw_8051);
		if (fw_fabric_serdes_load)
			dispose_one_firmware(&fw_fabric);
		if (fw_sbus_load)
			dispose_one_firmware(&fw_sbus);
		if (fw_pcie_serdes_load)
			dispose_one_firmware(&fw_pcie);
		fw_8051_name = ALT_FW_8051_NAME_ASIC;
		fw_fabric_serdes_name = ALT_FW_FABRIC_NAME;
		fw_sbus_name = ALT_FW_SBUS_NAME;
		fw_pcie_serdes_name = ALT_FW_PCIE_NAME;
	}

	if (fw_sbus_load) {
		err = obtain_one_firmware(dd, fw_sbus_name, &fw_sbus);
		if (err)
			goto done;
	}

	if (fw_pcie_serdes_load) {
		err = obtain_one_firmware(dd, fw_pcie_serdes_name, &fw_pcie);
		if (err)
			goto done;
	}

	if (fw_fabric_serdes_load) {
		err = obtain_one_firmware(dd, fw_fabric_serdes_name,
					  &fw_fabric);
		if (err)
			goto done;
	}

	if (fw_8051_load) {
		err = obtain_one_firmware(dd, fw_8051_name, &fw_8051);
		if (err)
			goto done;
	}

done:
	if (err) {
		/* oops, had problems obtaining a firmware */
		if (fw_state == FW_EMPTY && dd->icode == ICODE_RTL_SILICON) {
			/* retry with alternate (RTL only) */
			fw_state = FW_TRY;
			goto retry;
		}
		dd_dev_err(dd, "unable to obtain working firmware\n");
		fw_state = FW_ERR;
		fw_err = -ENOENT;
	} else {
		/* success */
		if (fw_state == FW_EMPTY &&
		    dd->icode != ICODE_FUNCTIONAL_SIMULATOR)
			fw_state = FW_TRY;	/* may retry later */
		else
			fw_state = FW_FINAL;	/* cannot try again */
	}
}

/*
 * Called by all HFIs when loading their firmware - i.e. device probe time.
 * The first one will do the actual firmware load.  Use a mutex to resolve
 * any possible race condition.
 *
 * The call to this routine cannot be moved to driver load because the kernel
 * call request_firmware() requires a device which is only available after
 * the first device probe.
 */
static int obtain_firmware(struct hfi1_devdata *dd)
{
	unsigned long timeout;
	int err = 0;

	mutex_lock(&fw_mutex);

	/* 40s delay due to long delay on missing firmware on some systems */
	timeout = jiffies + msecs_to_jiffies(40000);
	while (fw_state == FW_TRY) {
		/*
		 * Another device is trying the firmware.  Wait until it
		 * decides what works (or not).
		 */
		if (time_after(jiffies, timeout)) {
			/* waited too long */
			dd_dev_err(dd, "Timeout waiting for firmware try");
			fw_state = FW_ERR;
			fw_err = -ETIMEDOUT;
			break;
		}
		mutex_unlock(&fw_mutex);
		msleep(20);	/* arbitrary delay */
		mutex_lock(&fw_mutex);
	}
	/* not in FW_TRY state */

	if (fw_state == FW_FINAL) {
		if (platform_config) {
			dd->platform_config.data = platform_config->data;
			dd->platform_config.size = platform_config->size;
		}
		goto done;	/* already acquired */
	} else if (fw_state == FW_ERR) {
		goto done;	/* already tried and failed */
	}
	/* fw_state is FW_EMPTY */

	/* set fw_state to FW_TRY, FW_FINAL, or FW_ERR, and fw_err */
	__obtain_firmware(dd);

	if (platform_config_load) {
		platform_config = NULL;
		err = request_firmware(&platform_config, platform_config_name,
				       &dd->pcidev->dev);
		if (err) {
			platform_config = NULL;
			goto done;
		}
		dd->platform_config.data = platform_config->data;
		dd->platform_config.size = platform_config->size;
	}

done:
	mutex_unlock(&fw_mutex);

	return fw_err;
}

/*
 * Called when the driver unloads.  The timing is asymmetric with its
 * counterpart, obtain_firmware().  If called at device remove time,
 * then it is conceivable that another device could probe while the
 * firmware is being disposed.  The mutexes can be moved to do that
 * safely, but then the firmware would be requested from the OS multiple
 * times.
 *
 * No mutex is needed as the driver is unloading and there cannot be any
 * other callers.
 */
void dispose_firmware(void)
{
	dispose_one_firmware(&fw_8051);
	dispose_one_firmware(&fw_fabric);
	dispose_one_firmware(&fw_pcie);
	dispose_one_firmware(&fw_sbus);

	release_firmware(platform_config);
	platform_config = NULL;

	/* retain the error state, otherwise revert to empty */
	if (fw_state != FW_ERR)
		fw_state = FW_EMPTY;
}

/*
 * Called with the result of a firmware download.
 *
 * Return 1 to retry loading the firmware, 0 to stop.
 */
static int retry_firmware(struct hfi1_devdata *dd, int load_result)
{
	int retry;

	mutex_lock(&fw_mutex);

	if (load_result == 0) {
		/*
		 * The load succeeded, so expect all others to do the same.
		 * Do not retry again.
		 */
		if (fw_state == FW_TRY)
			fw_state = FW_FINAL;
		retry = 0;	/* do NOT retry */
	} else if (fw_state == FW_TRY) {
		/* load failed, obtain alternate firmware */
		__obtain_firmware(dd);
		retry = (fw_state == FW_FINAL);
	} else {
		/* else in FW_FINAL or FW_ERR, no retry in either case */
		retry = 0;
	}

	mutex_unlock(&fw_mutex);
	return retry;
}

/*
 * Write a block of data to a given array CSR.  All calls will be in
 * multiples of 8 bytes.
 */
static void write_rsa_data(struct hfi1_devdata *dd, int what,
			   const u8 *data, int nbytes)
{
	int qw_size = nbytes / 8;
	int i;

	if (((unsigned long)data & 0x7) == 0) {
		/* aligned */
		u64 *ptr = (u64 *)data;

		for (i = 0; i < qw_size; i++, ptr++)
			write_csr(dd, what + (8 * i), *ptr);
	} else {
		/* not aligned */
		for (i = 0; i < qw_size; i++, data += 8) {
			u64 value;

			memcpy(&value, data, 8);
			write_csr(dd, what + (8 * i), value);
		}
	}
}

/*
 * Write a block of data to a given CSR as a stream of writes.  All calls will
 * be in multiples of 8 bytes.
 */
static void write_streamed_rsa_data(struct hfi1_devdata *dd, int what,
				    const u8 *data, int nbytes)
{
	u64 *ptr = (u64 *)data;
	int qw_size = nbytes / 8;

	for (; qw_size > 0; qw_size--, ptr++)
		write_csr(dd, what, *ptr);
}

/*
 * Download the signature and start the RSA mechanism.  Wait for
 * RSA_ENGINE_TIMEOUT before giving up.
 */
static int run_rsa(struct hfi1_devdata *dd, const char *who,
		   const u8 *signature)
{
	unsigned long timeout;
	u64 reg;
	u32 status;
	int ret = 0;

	/* write the signature */
	write_rsa_data(dd, MISC_CFG_RSA_SIGNATURE, signature, KEY_SIZE);

	/* initialize RSA */
	write_csr(dd, MISC_CFG_RSA_CMD, RSA_CMD_INIT);

	/*
	 * Make sure the engine is idle and insert a delay between the two
	 * writes to MISC_CFG_RSA_CMD.
	 */
	status = (read_csr(dd, MISC_CFG_FW_CTRL)
			   & MISC_CFG_FW_CTRL_RSA_STATUS_SMASK)
			     >> MISC_CFG_FW_CTRL_RSA_STATUS_SHIFT;
	if (status != RSA_STATUS_IDLE) {
		dd_dev_err(dd, "%s security engine not idle - giving up\n",
			   who);
		return -EBUSY;
	}

	/* start RSA */
	write_csr(dd, MISC_CFG_RSA_CMD, RSA_CMD_START);

	/*
	 * Look for the result.
	 *
	 * The RSA engine is hooked up to two MISC errors.  The driver
	 * masks these errors as they do not respond to the standard
	 * error "clear down" mechanism.  Look for these errors here and
	 * clear them when possible.  This routine will exit with the
	 * errors of the current run still set.
	 *
	 * MISC_FW_AUTH_FAILED_ERR
	 *	Firmware authorization failed.  This can be cleared by
	 *	re-initializing the RSA engine, then clearing the status bit.
	 *	Do not re-init the RSA angine immediately after a successful
	 *	run - this will reset the current authorization.
	 *
	 * MISC_KEY_MISMATCH_ERR
	 *	Key does not match.  The only way to clear this is to load
	 *	a matching key then clear the status bit.  If this error
	 *	is raised, it will persist outside of this routine until a
	 *	matching key is loaded.
	 */
	timeout = msecs_to_jiffies(RSA_ENGINE_TIMEOUT) + jiffies;
	while (1) {
		status = (read_csr(dd, MISC_CFG_FW_CTRL)
			   & MISC_CFG_FW_CTRL_RSA_STATUS_SMASK)
			     >> MISC_CFG_FW_CTRL_RSA_STATUS_SHIFT;

		if (status == RSA_STATUS_IDLE) {
			/* should not happen */
			dd_dev_err(dd, "%s firmware security bad idle state\n",
				   who);
			ret = -EINVAL;
			break;
		} else if (status == RSA_STATUS_DONE) {
			/* finished successfully */
			break;
		} else if (status == RSA_STATUS_FAILED) {
			/* finished unsuccessfully */
			ret = -EINVAL;
			break;
		}
		/* else still active */

		if (time_after(jiffies, timeout)) {
			/*
			 * Timed out while active.  We can't reset the engine
			 * if it is stuck active, but run through the
			 * error code to see what error bits are set.
			 */
			dd_dev_err(dd, "%s firmware security time out\n", who);
			ret = -ETIMEDOUT;
			break;
		}

		msleep(20);
	}

	/*
	 * Arrive here on success or failure.  Clear all RSA engine
	 * errors.  All current errors will stick - the RSA logic is keeping
	 * error high.  All previous errors will clear - the RSA logic
	 * is not keeping the error high.
	 */
	write_csr(dd, MISC_ERR_CLEAR,
		  MISC_ERR_STATUS_MISC_FW_AUTH_FAILED_ERR_SMASK |
		  MISC_ERR_STATUS_MISC_KEY_MISMATCH_ERR_SMASK);
	/*
	 * All that is left are the current errors.  Print warnings on
	 * authorization failure details, if any.  Firmware authorization
	 * can be retried, so these are only warnings.
	 */
	reg = read_csr(dd, MISC_ERR_STATUS);
	if (ret) {
		if (reg & MISC_ERR_STATUS_MISC_FW_AUTH_FAILED_ERR_SMASK)
			dd_dev_warn(dd, "%s firmware authorization failed\n",
				    who);
		if (reg & MISC_ERR_STATUS_MISC_KEY_MISMATCH_ERR_SMASK)
			dd_dev_warn(dd, "%s firmware key mismatch\n", who);
	}

	return ret;
}

static void load_security_variables(struct hfi1_devdata *dd,
				    struct firmware_details *fdet)
{
	/* Security variables a.  Write the modulus */
	write_rsa_data(dd, MISC_CFG_RSA_MODULUS, fdet->modulus, KEY_SIZE);
	/* Security variables b.  Write the r2 */
	write_rsa_data(dd, MISC_CFG_RSA_R2, fdet->r2, KEY_SIZE);
	/* Security variables c.  Write the mu */
	write_rsa_data(dd, MISC_CFG_RSA_MU, fdet->mu, MU_SIZE);
	/* Security variables d.  Write the header */
	write_streamed_rsa_data(dd, MISC_CFG_SHA_PRELOAD,
				(u8 *)fdet->css_header,
				sizeof(struct css_header));
}

/* return the 8051 firmware state */
static inline u32 get_firmware_state(struct hfi1_devdata *dd)
{
	u64 reg = read_csr(dd, DC_DC8051_STS_CUR_STATE);

	return (reg >> DC_DC8051_STS_CUR_STATE_FIRMWARE_SHIFT)
				& DC_DC8051_STS_CUR_STATE_FIRMWARE_MASK;
}

/*
 * Wait until the firmware is up and ready to take host requests.
 * Return 0 on success, -ETIMEDOUT on timeout.
 */
int wait_fm_ready(struct hfi1_devdata *dd, u32 mstimeout)
{
	unsigned long timeout;

	/* in the simulator, the fake 8051 is always ready */
	if (dd->icode == ICODE_FUNCTIONAL_SIMULATOR)
		return 0;

	timeout = msecs_to_jiffies(mstimeout) + jiffies;
	while (1) {
		if (get_firmware_state(dd) == 0xa0)	/* ready */
			return 0;
		if (time_after(jiffies, timeout))	/* timed out */
			return -ETIMEDOUT;
		usleep_range(1950, 2050); /* sleep 2ms-ish */
	}
}

/*
 * Load the 8051 firmware.
 */
static int load_8051_firmware(struct hfi1_devdata *dd,
			      struct firmware_details *fdet)
{
	u64 reg;
	int ret;
	u8 ver_a, ver_b;

	/*
	 * DC Reset sequence
	 * Load DC 8051 firmware
	 */
	/*
	 * DC reset step 1: Reset DC8051
	 */
	reg = DC_DC8051_CFG_RST_M8051W_SMASK
		| DC_DC8051_CFG_RST_CRAM_SMASK
		| DC_DC8051_CFG_RST_DRAM_SMASK
		| DC_DC8051_CFG_RST_IRAM_SMASK
		| DC_DC8051_CFG_RST_SFR_SMASK;
	write_csr(dd, DC_DC8051_CFG_RST, reg);

	/*
	 * DC reset step 2 (optional): Load 8051 data memory with link
	 * configuration
	 */

	/*
	 * DC reset step 3: Load DC8051 firmware
	 */
	/* release all but the core reset */
	reg = DC_DC8051_CFG_RST_M8051W_SMASK;
	write_csr(dd, DC_DC8051_CFG_RST, reg);

	/* Firmware load step 1 */
	load_security_variables(dd, fdet);

	/*
	 * Firmware load step 2.  Clear MISC_CFG_FW_CTRL.FW_8051_LOADED
	 */
	write_csr(dd, MISC_CFG_FW_CTRL, 0);

	/* Firmware load steps 3-5 */
	ret = write_8051(dd, 1/*code*/, 0, fdet->firmware_ptr,
			 fdet->firmware_len);
	if (ret)
		return ret;

	/*
	 * DC reset step 4. Host starts the DC8051 firmware
	 */
	/*
	 * Firmware load step 6.  Set MISC_CFG_FW_CTRL.FW_8051_LOADED
	 */
	write_csr(dd, MISC_CFG_FW_CTRL, MISC_CFG_FW_CTRL_FW_8051_LOADED_SMASK);

	/* Firmware load steps 7-10 */
	ret = run_rsa(dd, "8051", fdet->signature);
	if (ret)
		return ret;

	/* clear all reset bits, releasing the 8051 */
	write_csr(dd, DC_DC8051_CFG_RST, 0ull);

	/*
	 * DC reset step 5. Wait for firmware to be ready to accept host
	 * requests.
	 */
	ret = wait_fm_ready(dd, TIMEOUT_8051_START);
	if (ret) { /* timed out */
		dd_dev_err(dd, "8051 start timeout, current state 0x%x\n",
			   get_firmware_state(dd));
		return -ETIMEDOUT;
	}

	read_misc_status(dd, &ver_a, &ver_b);
	dd_dev_info(dd, "8051 firmware version %d.%d\n",
		    (int)ver_b, (int)ver_a);
	dd->dc8051_ver = dc8051_ver(ver_b, ver_a);

	return 0;
}

/*
 * Write the SBus request register
 *
 * No need for masking - the arguments are sized exactly.
 */
void sbus_request(struct hfi1_devdata *dd,
		  u8 receiver_addr, u8 data_addr, u8 command, u32 data_in)
{
	write_csr(dd, ASIC_CFG_SBUS_REQUEST,
		  ((u64)data_in << ASIC_CFG_SBUS_REQUEST_DATA_IN_SHIFT) |
		  ((u64)command << ASIC_CFG_SBUS_REQUEST_COMMAND_SHIFT) |
		  ((u64)data_addr << ASIC_CFG_SBUS_REQUEST_DATA_ADDR_SHIFT) |
		  ((u64)receiver_addr <<
		   ASIC_CFG_SBUS_REQUEST_RECEIVER_ADDR_SHIFT));
}

/*
 * Read a value from the SBus.
 *
 * Requires the caller to be in fast mode
 */
static u32 sbus_read(struct hfi1_devdata *dd, u8 receiver_addr, u8 data_addr,
		     u32 data_in)
{
	u64 reg;
	int retries;
	int success = 0;
	u32 result = 0;
	u32 result_code = 0;

	sbus_request(dd, receiver_addr, data_addr, READ_SBUS_RECEIVER, data_in);

	for (retries = 0; retries < 100; retries++) {
		usleep_range(1000, 1200); /* arbitrary */
		reg = read_csr(dd, ASIC_STS_SBUS_RESULT);
		result_code = (reg >> ASIC_STS_SBUS_RESULT_RESULT_CODE_SHIFT)
				& ASIC_STS_SBUS_RESULT_RESULT_CODE_MASK;
		if (result_code != SBUS_READ_COMPLETE)
			continue;

		success = 1;
		result = (reg >> ASIC_STS_SBUS_RESULT_DATA_OUT_SHIFT)
			   & ASIC_STS_SBUS_RESULT_DATA_OUT_MASK;
		break;
	}

	if (!success) {
		dd_dev_err(dd, "%s: read failed, result code 0x%x\n", __func__,
			   result_code);
	}

	return result;
}

/*
 * Turn off the SBus and fabric serdes spicos.
 *
 * + Must be called with Sbus fast mode turned on.
 * + Must be called after fabric serdes broadcast is set up.
 * + Must be called before the 8051 is loaded - assumes 8051 is not loaded
 *   when using MISC_CFG_FW_CTRL.
 */
static void turn_off_spicos(struct hfi1_devdata *dd, int flags)
{
	/* only needed on A0 */
	if (!is_ax(dd))
		return;

	dd_dev_info(dd, "Turning off spicos:%s%s\n",
		    flags & SPICO_SBUS ? " SBus" : "",
		    flags & SPICO_FABRIC ? " fabric" : "");

	write_csr(dd, MISC_CFG_FW_CTRL, ENABLE_SPICO_SMASK);
	/* disable SBus spico */
	if (flags & SPICO_SBUS)
		sbus_request(dd, SBUS_MASTER_BROADCAST, 0x01,
			     WRITE_SBUS_RECEIVER, 0x00000040);

	/* disable the fabric serdes spicos */
	if (flags & SPICO_FABRIC)
		sbus_request(dd, fabric_serdes_broadcast[dd->hfi1_id],
			     0x07, WRITE_SBUS_RECEIVER, 0x00000000);
	write_csr(dd, MISC_CFG_FW_CTRL, 0);
}

/*
 * Reset all of the fabric serdes for this HFI in preparation to take the
 * link to Polling.
 *
 * To do a reset, we need to write to to the serdes registers.  Unfortunately,
 * the fabric serdes download to the other HFI on the ASIC will have turned
 * off the firmware validation on this HFI.  This means we can't write to the
 * registers to reset the serdes.  Work around this by performing a complete
 * re-download and validation of the fabric serdes firmware.  This, as a
 * by-product, will reset the serdes.  NOTE: the re-download requires that
 * the 8051 be in the Offline state.  I.e. not actively trying to use the
 * serdes.  This routine is called at the point where the link is Offline and
 * is getting ready to go to Polling.
 */
void fabric_serdes_reset(struct hfi1_devdata *dd)
{
	int ret;

	if (!fw_fabric_serdes_load)
		return;

	ret = acquire_chip_resource(dd, CR_SBUS, SBUS_TIMEOUT);
	if (ret) {
		dd_dev_err(dd,
			   "Cannot acquire SBus resource to reset fabric SerDes - perhaps you should reboot\n");
		return;
	}
	set_sbus_fast_mode(dd);

	if (is_ax(dd)) {
		/* A0 serdes do not work with a re-download */
		u8 ra = fabric_serdes_broadcast[dd->hfi1_id];

		/* place SerDes in reset and disable SPICO */
		sbus_request(dd, ra, 0x07, WRITE_SBUS_RECEIVER, 0x00000011);
		/* wait 100 refclk cycles @ 156.25MHz => 640ns */
		udelay(1);
		/* remove SerDes reset */
		sbus_request(dd, ra, 0x07, WRITE_SBUS_RECEIVER, 0x00000010);
		/* turn SPICO enable on */
		sbus_request(dd, ra, 0x07, WRITE_SBUS_RECEIVER, 0x00000002);
	} else {
		turn_off_spicos(dd, SPICO_FABRIC);
		/*
		 * No need for firmware retry - what to download has already
		 * been decided.
		 * No need to pay attention to the load return - the only
		 * failure is a validation failure, which has already been
		 * checked by the initial download.
		 */
		(void)load_fabric_serdes_firmware(dd, &fw_fabric);
	}

	clear_sbus_fast_mode(dd);
	release_chip_resource(dd, CR_SBUS);
}

/* Access to the SBus in this routine should probably be serialized */
int sbus_request_slow(struct hfi1_devdata *dd,
		      u8 receiver_addr, u8 data_addr, u8 command, u32 data_in)
{
	u64 reg, count = 0;

	/* make sure fast mode is clear */
	clear_sbus_fast_mode(dd);

	sbus_request(dd, receiver_addr, data_addr, command, data_in);
	write_csr(dd, ASIC_CFG_SBUS_EXECUTE,
		  ASIC_CFG_SBUS_EXECUTE_EXECUTE_SMASK);
	/* Wait for both DONE and RCV_DATA_VALID to go high */
	reg = read_csr(dd, ASIC_STS_SBUS_RESULT);
	while (!((reg & ASIC_STS_SBUS_RESULT_DONE_SMASK) &&
		 (reg & ASIC_STS_SBUS_RESULT_RCV_DATA_VALID_SMASK))) {
		if (count++ >= SBUS_MAX_POLL_COUNT) {
			u64 counts = read_csr(dd, ASIC_STS_SBUS_COUNTERS);
			/*
			 * If the loop has timed out, we are OK if DONE bit
			 * is set and RCV_DATA_VALID and EXECUTE counters
			 * are the same. If not, we cannot proceed.
			 */
			if ((reg & ASIC_STS_SBUS_RESULT_DONE_SMASK) &&
			    (SBUS_COUNTER(counts, RCV_DATA_VALID) ==
			     SBUS_COUNTER(counts, EXECUTE)))
				break;
			return -ETIMEDOUT;
		}
		udelay(1);
		reg = read_csr(dd, ASIC_STS_SBUS_RESULT);
	}
	count = 0;
	write_csr(dd, ASIC_CFG_SBUS_EXECUTE, 0);
	/* Wait for DONE to clear after EXECUTE is cleared */
	reg = read_csr(dd, ASIC_STS_SBUS_RESULT);
	while (reg & ASIC_STS_SBUS_RESULT_DONE_SMASK) {
		if (count++ >= SBUS_MAX_POLL_COUNT)
			return -ETIME;
		udelay(1);
		reg = read_csr(dd, ASIC_STS_SBUS_RESULT);
	}
	return 0;
}

static int load_fabric_serdes_firmware(struct hfi1_devdata *dd,
				       struct firmware_details *fdet)
{
	int i, err;
	const u8 ra = fabric_serdes_broadcast[dd->hfi1_id]; /* receiver addr */

	dd_dev_info(dd, "Downloading fabric firmware\n");

	/* step 1: load security variables */
	load_security_variables(dd, fdet);
	/* step 2: place SerDes in reset and disable SPICO */
	sbus_request(dd, ra, 0x07, WRITE_SBUS_RECEIVER, 0x00000011);
	/* wait 100 refclk cycles @ 156.25MHz => 640ns */
	udelay(1);
	/* step 3:  remove SerDes reset */
	sbus_request(dd, ra, 0x07, WRITE_SBUS_RECEIVER, 0x00000010);
	/* step 4: assert IMEM override */
	sbus_request(dd, ra, 0x00, WRITE_SBUS_RECEIVER, 0x40000000);
	/* step 5: download SerDes machine code */
	for (i = 0; i < fdet->firmware_len; i += 4) {
		sbus_request(dd, ra, 0x0a, WRITE_SBUS_RECEIVER,
			     *(u32 *)&fdet->firmware_ptr[i]);
	}
	/* step 6: IMEM override off */
	sbus_request(dd, ra, 0x00, WRITE_SBUS_RECEIVER, 0x00000000);
	/* step 7: turn ECC on */
	sbus_request(dd, ra, 0x0b, WRITE_SBUS_RECEIVER, 0x000c0000);

	/* steps 8-11: run the RSA engine */
	err = run_rsa(dd, "fabric serdes", fdet->signature);
	if (err)
		return err;

	/* step 12: turn SPICO enable on */
	sbus_request(dd, ra, 0x07, WRITE_SBUS_RECEIVER, 0x00000002);
	/* step 13: enable core hardware interrupts */
	sbus_request(dd, ra, 0x08, WRITE_SBUS_RECEIVER, 0x00000000);

	return 0;
}

static int load_sbus_firmware(struct hfi1_devdata *dd,
			      struct firmware_details *fdet)
{
	int i, err;
	const u8 ra = SBUS_MASTER_BROADCAST; /* receiver address */

	dd_dev_info(dd, "Downloading SBus firmware\n");

	/* step 1: load security variables */
	load_security_variables(dd, fdet);
	/* step 2: place SPICO into reset and enable off */
	sbus_request(dd, ra, 0x01, WRITE_SBUS_RECEIVER, 0x000000c0);
	/* step 3: remove reset, enable off, IMEM_CNTRL_EN on */
	sbus_request(dd, ra, 0x01, WRITE_SBUS_RECEIVER, 0x00000240);
	/* step 4: set starting IMEM address for burst download */
	sbus_request(dd, ra, 0x03, WRITE_SBUS_RECEIVER, 0x80000000);
	/* step 5: download the SBus Master machine code */
	for (i = 0; i < fdet->firmware_len; i += 4) {
		sbus_request(dd, ra, 0x14, WRITE_SBUS_RECEIVER,
			     *(u32 *)&fdet->firmware_ptr[i]);
	}
	/* step 6: set IMEM_CNTL_EN off */
	sbus_request(dd, ra, 0x01, WRITE_SBUS_RECEIVER, 0x00000040);
	/* step 7: turn ECC on */
	sbus_request(dd, ra, 0x16, WRITE_SBUS_RECEIVER, 0x000c0000);

	/* steps 8-11: run the RSA engine */
	err = run_rsa(dd, "SBus", fdet->signature);
	if (err)
		return err;

	/* step 12: set SPICO_ENABLE on */
	sbus_request(dd, ra, 0x01, WRITE_SBUS_RECEIVER, 0x00000140);

	return 0;
}

static int load_pcie_serdes_firmware(struct hfi1_devdata *dd,
				     struct firmware_details *fdet)
{
	int i;
	const u8 ra = SBUS_MASTER_BROADCAST; /* receiver address */

	dd_dev_info(dd, "Downloading PCIe firmware\n");

	/* step 1: load security variables */
	load_security_variables(dd, fdet);
	/* step 2: assert single step (halts the SBus Master spico) */
	sbus_request(dd, ra, 0x05, WRITE_SBUS_RECEIVER, 0x00000001);
	/* step 3: enable XDMEM access */
	sbus_request(dd, ra, 0x01, WRITE_SBUS_RECEIVER, 0x00000d40);
	/* step 4: load firmware into SBus Master XDMEM */
	/*
	 * NOTE: the dmem address, write_en, and wdata are all pre-packed,
	 * we only need to pick up the bytes and write them
	 */
	for (i = 0; i < fdet->firmware_len; i += 4) {
		sbus_request(dd, ra, 0x04, WRITE_SBUS_RECEIVER,
			     *(u32 *)&fdet->firmware_ptr[i]);
	}
	/* step 5: disable XDMEM access */
	sbus_request(dd, ra, 0x01, WRITE_SBUS_RECEIVER, 0x00000140);
	/* step 6: allow SBus Spico to run */
	sbus_request(dd, ra, 0x05, WRITE_SBUS_RECEIVER, 0x00000000);

	/*
	 * steps 7-11: run RSA, if it succeeds, firmware is available to
	 * be swapped
	 */
	return run_rsa(dd, "PCIe serdes", fdet->signature);
}

/*
 * Set the given broadcast values on the given list of devices.
 */
static void set_serdes_broadcast(struct hfi1_devdata *dd, u8 bg1, u8 bg2,
				 const u8 *addrs, int count)
{
	while (--count >= 0) {
		/*
		 * Set BROADCAST_GROUP_1 and BROADCAST_GROUP_2, leave
		 * defaults for everything else.  Do not read-modify-write,
		 * per instruction from the manufacturer.
		 *
		 * Register 0xfd:
		 *	bits    what
		 *	-----	---------------------------------
		 *	  0	IGNORE_BROADCAST  (default 0)
		 *	11:4	BROADCAST_GROUP_1 (default 0xff)
		 *	23:16	BROADCAST_GROUP_2 (default 0xff)
		 */
		sbus_request(dd, addrs[count], 0xfd, WRITE_SBUS_RECEIVER,
			     (u32)bg1 << 4 | (u32)bg2 << 16);
	}
}

int acquire_hw_mutex(struct hfi1_devdata *dd)
{
	unsigned long timeout;
	int try = 0;
	u8 mask = 1 << dd->hfi1_id;
	u8 user;

retry:
	timeout = msecs_to_jiffies(HM_TIMEOUT) + jiffies;
	while (1) {
		write_csr(dd, ASIC_CFG_MUTEX, mask);
		user = (u8)read_csr(dd, ASIC_CFG_MUTEX);
		if (user == mask)
			return 0; /* success */
		if (time_after(jiffies, timeout))
			break; /* timed out */
		msleep(20);
	}

	/* timed out */
	dd_dev_err(dd,
		   "Unable to acquire hardware mutex, mutex mask %u, my mask %u (%s)\n",
		   (u32)user, (u32)mask, (try == 0) ? "retrying" : "giving up");

	if (try == 0) {
		/* break mutex and retry */
		write_csr(dd, ASIC_CFG_MUTEX, 0);
		try++;
		goto retry;
	}

	return -EBUSY;
}

void release_hw_mutex(struct hfi1_devdata *dd)
{
	write_csr(dd, ASIC_CFG_MUTEX, 0);
}

/* return the given resource bit(s) as a mask for the given HFI */
static inline u64 resource_mask(u32 hfi1_id, u32 resource)
{
	return ((u64)resource) << (hfi1_id ? CR_DYN_SHIFT : 0);
}

static void fail_mutex_acquire_message(struct hfi1_devdata *dd,
				       const char *func)
{
	dd_dev_err(dd,
		   "%s: hardware mutex stuck - suggest rebooting the machine\n",
		   func);
}

/*
 * Acquire access to a chip resource.
 *
 * Return 0 on success, -EBUSY if resource busy, -EIO if mutex acquire failed.
 */
static int __acquire_chip_resource(struct hfi1_devdata *dd, u32 resource)
{
	u64 scratch0, all_bits, my_bit;
	int ret;

	if (resource & CR_DYN_MASK) {
		/* a dynamic resource is in use if either HFI has set the bit */
		if (dd->pcidev->device == PCI_DEVICE_ID_INTEL0 &&
		    (resource & (CR_I2C1 | CR_I2C2))) {
			/* discrete devices must serialize across both chains */
			all_bits = resource_mask(0, CR_I2C1 | CR_I2C2) |
					resource_mask(1, CR_I2C1 | CR_I2C2);
		} else {
			all_bits = resource_mask(0, resource) |
						resource_mask(1, resource);
		}
		my_bit = resource_mask(dd->hfi1_id, resource);
	} else {
		/* non-dynamic resources are not split between HFIs */
		all_bits = resource;
		my_bit = resource;
	}

	/* lock against other callers within the driver wanting a resource */
	mutex_lock(&dd->asic_data->asic_resource_mutex);

	ret = acquire_hw_mutex(dd);
	if (ret) {
		fail_mutex_acquire_message(dd, __func__);
		ret = -EIO;
		goto done;
	}

	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
	if (scratch0 & all_bits) {
		ret = -EBUSY;
	} else {
		write_csr(dd, ASIC_CFG_SCRATCH, scratch0 | my_bit);
		/* force write to be visible to other HFI on another OS */
		(void)read_csr(dd, ASIC_CFG_SCRATCH);
	}

	release_hw_mutex(dd);

done:
	mutex_unlock(&dd->asic_data->asic_resource_mutex);
	return ret;
}

/*
 * Acquire access to a chip resource, wait up to mswait milliseconds for
 * the resource to become available.
 *
 * Return 0 on success, -EBUSY if busy (even after wait), -EIO if mutex
 * acquire failed.
 */
int acquire_chip_resource(struct hfi1_devdata *dd, u32 resource, u32 mswait)
{
	unsigned long timeout;
	int ret;

	timeout = jiffies + msecs_to_jiffies(mswait);
	while (1) {
		ret = __acquire_chip_resource(dd, resource);
		if (ret != -EBUSY)
			return ret;
		/* resource is busy, check our timeout */
		if (time_after_eq(jiffies, timeout))
			return -EBUSY;
		usleep_range(80, 120);	/* arbitrary delay */
	}
}

/*
 * Release access to a chip resource
 */
void release_chip_resource(struct hfi1_devdata *dd, u32 resource)
{
	u64 scratch0, bit;

	/* only dynamic resources should ever be cleared */
	if (!(resource & CR_DYN_MASK)) {
		dd_dev_err(dd, "%s: invalid resource 0x%x\n", __func__,
			   resource);
		return;
	}
	bit = resource_mask(dd->hfi1_id, resource);

	/* lock against other callers within the driver wanting a resource */
	mutex_lock(&dd->asic_data->asic_resource_mutex);

	if (acquire_hw_mutex(dd)) {
		fail_mutex_acquire_message(dd, __func__);
		goto done;
	}

	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
	if ((scratch0 & bit) != 0) {
		scratch0 &= ~bit;
		write_csr(dd, ASIC_CFG_SCRATCH, scratch0);
		/* force write to be visible to other HFI on another OS */
		(void)read_csr(dd, ASIC_CFG_SCRATCH);
	} else {
		dd_dev_warn(dd, "%s: id %d, resource 0x%x: bit not set\n",
			    __func__, dd->hfi1_id, resource);
	}

	release_hw_mutex(dd);

done:
	mutex_unlock(&dd->asic_data->asic_resource_mutex);
}

/*
 * Return true if resource is set, false otherwise.  Print a warning
 * if not set and a function is supplied.
 */
bool check_chip_resource(struct hfi1_devdata *dd, u32 resource,
			 const char *func)
{
	u64 scratch0, bit;

	if (resource & CR_DYN_MASK)
		bit = resource_mask(dd->hfi1_id, resource);
	else
		bit = resource;

	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
	if ((scratch0 & bit) == 0) {
		if (func)
			dd_dev_warn(dd,
				    "%s: id %d, resource 0x%x, not acquired!\n",
				    func, dd->hfi1_id, resource);
		return false;
	}
	return true;
}

static void clear_chip_resources(struct hfi1_devdata *dd, const char *func)
{
	u64 scratch0;

	/* lock against other callers within the driver wanting a resource */
	mutex_lock(&dd->asic_data->asic_resource_mutex);

	if (acquire_hw_mutex(dd)) {
		fail_mutex_acquire_message(dd, func);
		goto done;
	}

	/* clear all dynamic access bits for this HFI */
	scratch0 = read_csr(dd, ASIC_CFG_SCRATCH);
	scratch0 &= ~resource_mask(dd->hfi1_id, CR_DYN_MASK);
	write_csr(dd, ASIC_CFG_SCRATCH, scratch0);
	/* force write to be visible to other HFI on another OS */
	(void)read_csr(dd, ASIC_CFG_SCRATCH);

	release_hw_mutex(dd);

done:
	mutex_unlock(&dd->asic_data->asic_resource_mutex);
}

void init_chip_resources(struct hfi1_devdata *dd)
{
	/* clear any holds left by us */
	clear_chip_resources(dd, __func__);
}

void finish_chip_resources(struct hfi1_devdata *dd)
{
	/* clear any holds left by us */
	clear_chip_resources(dd, __func__);
}

void set_sbus_fast_mode(struct hfi1_devdata *dd)
{
	write_csr(dd, ASIC_CFG_SBUS_EXECUTE,
		  ASIC_CFG_SBUS_EXECUTE_FAST_MODE_SMASK);
}

void clear_sbus_fast_mode(struct hfi1_devdata *dd)
{
	u64 reg, count = 0;

	reg = read_csr(dd, ASIC_STS_SBUS_COUNTERS);
	while (SBUS_COUNTER(reg, EXECUTE) !=
	       SBUS_COUNTER(reg, RCV_DATA_VALID)) {
		if (count++ >= SBUS_MAX_POLL_COUNT)
			break;
		udelay(1);
		reg = read_csr(dd, ASIC_STS_SBUS_COUNTERS);
	}
	write_csr(dd, ASIC_CFG_SBUS_EXECUTE, 0);
}

int load_firmware(struct hfi1_devdata *dd)
{
	int ret;

	if (fw_fabric_serdes_load) {
		ret = acquire_chip_resource(dd, CR_SBUS, SBUS_TIMEOUT);
		if (ret)
			return ret;

		set_sbus_fast_mode(dd);

		set_serdes_broadcast(dd, all_fabric_serdes_broadcast,
				     fabric_serdes_broadcast[dd->hfi1_id],
				     fabric_serdes_addrs[dd->hfi1_id],
				     NUM_FABRIC_SERDES);
		turn_off_spicos(dd, SPICO_FABRIC);
		do {
			ret = load_fabric_serdes_firmware(dd, &fw_fabric);
		} while (retry_firmware(dd, ret));

		clear_sbus_fast_mode(dd);
		release_chip_resource(dd, CR_SBUS);
		if (ret)
			return ret;
	}

	if (fw_8051_load) {
		do {
			ret = load_8051_firmware(dd, &fw_8051);
		} while (retry_firmware(dd, ret));
		if (ret)
			return ret;
	}

	dump_fw_version(dd);
	return 0;
}

int hfi1_firmware_init(struct hfi1_devdata *dd)
{
	/* only RTL can use these */
	if (dd->icode != ICODE_RTL_SILICON) {
		fw_fabric_serdes_load = 0;
		fw_pcie_serdes_load = 0;
		fw_sbus_load = 0;
	}

	/* no 8051 or QSFP on simulator */
	if (dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
		fw_8051_load = 0;
		platform_config_load = 0;
	}

	if (!fw_8051_name) {
		if (dd->icode == ICODE_RTL_SILICON)
			fw_8051_name = DEFAULT_FW_8051_NAME_ASIC;
		else
			fw_8051_name = DEFAULT_FW_8051_NAME_FPGA;
	}
	if (!fw_fabric_serdes_name)
		fw_fabric_serdes_name = DEFAULT_FW_FABRIC_NAME;
	if (!fw_sbus_name)
		fw_sbus_name = DEFAULT_FW_SBUS_NAME;
	if (!fw_pcie_serdes_name)
		fw_pcie_serdes_name = DEFAULT_FW_PCIE_NAME;
	if (!platform_config_name)
		platform_config_name = DEFAULT_PLATFORM_CONFIG_NAME;

	return obtain_firmware(dd);
}

/*
 * This function is a helper function for parse_platform_config(...) and
 * does not check for validity of the platform configuration cache
 * (because we know it is invalid as we are building up the cache).
 * As such, this should not be called from anywhere other than
 * parse_platform_config
 */
static int check_meta_version(struct hfi1_devdata *dd, u32 *system_table)
{
	u32 meta_ver, meta_ver_meta, ver_start, ver_len, mask;
	struct platform_config_cache *pcfgcache = &dd->pcfg_cache;

	if (!system_table)
		return -EINVAL;

	meta_ver_meta =
	*(pcfgcache->config_tables[PLATFORM_CONFIG_SYSTEM_TABLE].table_metadata
	+ SYSTEM_TABLE_META_VERSION);

	mask = ((1 << METADATA_TABLE_FIELD_START_LEN_BITS) - 1);
	ver_start = meta_ver_meta & mask;

	meta_ver_meta >>= METADATA_TABLE_FIELD_LEN_SHIFT;

	mask = ((1 << METADATA_TABLE_FIELD_LEN_LEN_BITS) - 1);
	ver_len = meta_ver_meta & mask;

	ver_start /= 8;
	meta_ver = *((u8 *)system_table + ver_start) & ((1 << ver_len) - 1);

	if (meta_ver < 5) {
		dd_dev_info(
			dd, "%s:Please update platform config\n", __func__);
		return -EINVAL;
	}
	return 0;
}

int parse_platform_config(struct hfi1_devdata *dd)
{
	struct platform_config_cache *pcfgcache = &dd->pcfg_cache;
	u32 *ptr = NULL;
	u32 header1 = 0, header2 = 0, magic_num = 0, crc = 0, file_length = 0;
	u32 record_idx = 0, table_type = 0, table_length_dwords = 0;
	int ret = -EINVAL; /* assume failure */

	if (!dd->platform_config.data) {
		dd_dev_info(dd, "%s: Missing config file\n", __func__);
		goto bail;
	}
	ptr = (u32 *)dd->platform_config.data;

	magic_num = *ptr;
	ptr++;
	if (magic_num != PLATFORM_CONFIG_MAGIC_NUM) {
		dd_dev_info(dd, "%s: Bad config file\n", __func__);
		goto bail;
	}

	/* Field is file size in DWORDs */
	file_length = (*ptr) * 4;
	ptr++;

	if (file_length > dd->platform_config.size) {
		dd_dev_info(dd, "%s:File claims to be larger than read size\n",
			    __func__);
		goto bail;
	} else if (file_length < dd->platform_config.size) {
		dd_dev_info(dd,
			    "%s:File claims to be smaller than read size, continuing\n",
			    __func__);
	}
	/* exactly equal, perfection */

	/*
	 * In both cases where we proceed, using the self-reported file length
	 * is the safer option
	 */
	while (ptr < (u32 *)(dd->platform_config.data + file_length)) {
		header1 = *ptr;
		header2 = *(ptr + 1);
		if (header1 != ~header2) {
			dd_dev_info(dd, "%s: Failed validation at offset %ld\n",
				    __func__, (ptr - (u32 *)
					       dd->platform_config.data));
			goto bail;
		}

		record_idx = *ptr &
			((1 << PLATFORM_CONFIG_HEADER_RECORD_IDX_LEN_BITS) - 1);

		table_length_dwords = (*ptr >>
				PLATFORM_CONFIG_HEADER_TABLE_LENGTH_SHIFT) &
		      ((1 << PLATFORM_CONFIG_HEADER_TABLE_LENGTH_LEN_BITS) - 1);

		table_type = (*ptr >> PLATFORM_CONFIG_HEADER_TABLE_TYPE_SHIFT) &
			((1 << PLATFORM_CONFIG_HEADER_TABLE_TYPE_LEN_BITS) - 1);

		/* Done with this set of headers */
		ptr += 2;

		if (record_idx) {
			/* data table */
			switch (table_type) {
			case PLATFORM_CONFIG_SYSTEM_TABLE:
				pcfgcache->config_tables[table_type].num_table =
									1;
				ret = check_meta_version(dd, ptr);
				if (ret)
					goto bail;
				break;
			case PLATFORM_CONFIG_PORT_TABLE:
				pcfgcache->config_tables[table_type].num_table =
									2;
				break;
			case PLATFORM_CONFIG_RX_PRESET_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_TX_PRESET_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
				pcfgcache->config_tables[table_type].num_table =
							table_length_dwords;
				break;
			default:
				dd_dev_info(dd,
					    "%s: Unknown data table %d, offset %ld\n",
					    __func__, table_type,
					    (ptr - (u32 *)
					     dd->platform_config.data));
				goto bail; /* We don't trust this file now */
			}
			pcfgcache->config_tables[table_type].table = ptr;
		} else {
			/* metadata table */
			switch (table_type) {
			case PLATFORM_CONFIG_SYSTEM_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_PORT_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_RX_PRESET_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_TX_PRESET_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
				/* fall through */
			case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
				break;
			default:
				dd_dev_info(dd,
					    "%s: Unknown meta table %d, offset %ld\n",
					    __func__, table_type,
					    (ptr -
					     (u32 *)dd->platform_config.data));
				goto bail; /* We don't trust this file now */
			}
			pcfgcache->config_tables[table_type].table_metadata =
									ptr;
		}

		/* Calculate and check table crc */
		crc = crc32_le(~(u32)0, (unsigned char const *)ptr,
			       (table_length_dwords * 4));
		crc ^= ~(u32)0;

		/* Jump the table */
		ptr += table_length_dwords;
		if (crc != *ptr) {
			dd_dev_info(dd, "%s: Failed CRC check at offset %ld\n",
				    __func__, (ptr -
					       (u32 *)
					       dd->platform_config.data));
			goto bail;
		}
		/* Jump the CRC DWORD */
		ptr++;
	}

	pcfgcache->cache_valid = 1;
	return 0;
bail:
	memset(pcfgcache, 0, sizeof(struct platform_config_cache));
	return ret;
}

static int get_platform_fw_field_metadata(struct hfi1_devdata *dd, int table,
					  int field, u32 *field_len_bits,
					  u32 *field_start_bits)
{
	struct platform_config_cache *pcfgcache = &dd->pcfg_cache;
	u32 *src_ptr = NULL;

	if (!pcfgcache->cache_valid)
		return -EINVAL;

	switch (table) {
	case PLATFORM_CONFIG_SYSTEM_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_PORT_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_RX_PRESET_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_TX_PRESET_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
		if (field && field < platform_config_table_limits[table])
			src_ptr =
			pcfgcache->config_tables[table].table_metadata + field;
		break;
	default:
		dd_dev_info(dd, "%s: Unknown table\n", __func__);
		break;
	}

	if (!src_ptr)
		return -EINVAL;

	if (field_start_bits)
		*field_start_bits = *src_ptr &
		      ((1 << METADATA_TABLE_FIELD_START_LEN_BITS) - 1);

	if (field_len_bits)
		*field_len_bits = (*src_ptr >> METADATA_TABLE_FIELD_LEN_SHIFT)
		       & ((1 << METADATA_TABLE_FIELD_LEN_LEN_BITS) - 1);

	return 0;
}

/* This is the central interface to getting data out of the platform config
 * file. It depends on parse_platform_config() having populated the
 * platform_config_cache in hfi1_devdata, and checks the cache_valid member to
 * validate the sanity of the cache.
 *
 * The non-obvious parameters:
 * @table_index: Acts as a look up key into which instance of the tables the
 * relevant field is fetched from.
 *
 * This applies to the data tables that have multiple instances. The port table
 * is an exception to this rule as each HFI only has one port and thus the
 * relevant table can be distinguished by hfi_id.
 *
 * @data: pointer to memory that will be populated with the field requested.
 * @len: length of memory pointed by @data in bytes.
 */
int get_platform_config_field(struct hfi1_devdata *dd,
			      enum platform_config_table_type_encoding
			      table_type, int table_index, int field_index,
			      u32 *data, u32 len)
{
	int ret = 0, wlen = 0, seek = 0;
	u32 field_len_bits = 0, field_start_bits = 0, *src_ptr = NULL;
	struct platform_config_cache *pcfgcache = &dd->pcfg_cache;

	if (data)
		memset(data, 0, len);
	else
		return -EINVAL;

	ret = get_platform_fw_field_metadata(dd, table_type, field_index,
					     &field_len_bits,
					     &field_start_bits);
	if (ret)
		return -EINVAL;

	/* Convert length to bits */
	len *= 8;

	/* Our metadata function checked cache_valid and field_index for us */
	switch (table_type) {
	case PLATFORM_CONFIG_SYSTEM_TABLE:
		src_ptr = pcfgcache->config_tables[table_type].table;

		if (field_index != SYSTEM_TABLE_QSFP_POWER_CLASS_MAX) {
			if (len < field_len_bits)
				return -EINVAL;

			seek = field_start_bits / 8;
			wlen = field_len_bits / 8;

			src_ptr = (u32 *)((u8 *)src_ptr + seek);

			/*
			 * We expect the field to be byte aligned and whole byte
			 * lengths if we are here
			 */
			memcpy(data, src_ptr, wlen);
			return 0;
		}
		break;
	case PLATFORM_CONFIG_PORT_TABLE:
		/* Port table is 4 DWORDS */
		src_ptr = dd->hfi1_id ?
			pcfgcache->config_tables[table_type].table + 4 :
			pcfgcache->config_tables[table_type].table;
		break;
	case PLATFORM_CONFIG_RX_PRESET_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_TX_PRESET_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_QSFP_ATTEN_TABLE:
		/* fall through */
	case PLATFORM_CONFIG_VARIABLE_SETTINGS_TABLE:
		src_ptr = pcfgcache->config_tables[table_type].table;

		if (table_index <
			pcfgcache->config_tables[table_type].num_table)
			src_ptr += table_index;
		else
			src_ptr = NULL;
		break;
	default:
		dd_dev_info(dd, "%s: Unknown table\n", __func__);
		break;
	}

	if (!src_ptr || len < field_len_bits)
		return -EINVAL;

	src_ptr += (field_start_bits / 32);
	*data = (*src_ptr >> (field_start_bits % 32)) &
			((1 << field_len_bits) - 1);

	return 0;
}

/*
 * Download the firmware needed for the Gen3 PCIe SerDes.  An update
 * to the SBus firmware is needed before updating the PCIe firmware.
 *
 * Note: caller must be holding the SBus resource.
 */
int load_pcie_firmware(struct hfi1_devdata *dd)
{
	int ret = 0;

	/* both firmware loads below use the SBus */
	set_sbus_fast_mode(dd);

	if (fw_sbus_load) {
		turn_off_spicos(dd, SPICO_SBUS);
		do {
			ret = load_sbus_firmware(dd, &fw_sbus);
		} while (retry_firmware(dd, ret));
		if (ret)
			goto done;
	}

	if (fw_pcie_serdes_load) {
		dd_dev_info(dd, "Setting PCIe SerDes broadcast\n");
		set_serdes_broadcast(dd, all_pcie_serdes_broadcast,
				     pcie_serdes_broadcast[dd->hfi1_id],
				     pcie_serdes_addrs[dd->hfi1_id],
				     NUM_PCIE_SERDES);
		do {
			ret = load_pcie_serdes_firmware(dd, &fw_pcie);
		} while (retry_firmware(dd, ret));
		if (ret)
			goto done;
	}

done:
	clear_sbus_fast_mode(dd);

	return ret;
}

/*
 * Read the GUID from the hardware, store it in dd.
 */
void read_guid(struct hfi1_devdata *dd)
{
	/* Take the DC out of reset to get a valid GUID value */
	write_csr(dd, CCE_DC_CTRL, 0);
	(void)read_csr(dd, CCE_DC_CTRL);

	dd->base_guid = read_csr(dd, DC_DC8051_CFG_LOCAL_GUID);
	dd_dev_info(dd, "GUID %llx",
		    (unsigned long long)dd->base_guid);
}

/* read and display firmware version info */
static void dump_fw_version(struct hfi1_devdata *dd)
{
	u32 pcie_vers[NUM_PCIE_SERDES];
	u32 fabric_vers[NUM_FABRIC_SERDES];
	u32 sbus_vers;
	int i;
	int all_same;
	int ret;
	u8 rcv_addr;

	ret = acquire_chip_resource(dd, CR_SBUS, SBUS_TIMEOUT);
	if (ret) {
		dd_dev_err(dd, "Unable to acquire SBus to read firmware versions\n");
		return;
	}

	/* set fast mode */
	set_sbus_fast_mode(dd);

	/* read version for SBus Master */
	sbus_request(dd, SBUS_MASTER_BROADCAST, 0x02, WRITE_SBUS_RECEIVER, 0);
	sbus_request(dd, SBUS_MASTER_BROADCAST, 0x07, WRITE_SBUS_RECEIVER, 0x1);
	/* wait for interrupt to be processed */
	usleep_range(10000, 11000);
	sbus_vers = sbus_read(dd, SBUS_MASTER_BROADCAST, 0x08, 0x1);
	dd_dev_info(dd, "SBus Master firmware version 0x%08x\n", sbus_vers);

	/* read version for PCIe SerDes */
	all_same = 1;
	pcie_vers[0] = 0;
	for (i = 0; i < NUM_PCIE_SERDES; i++) {
		rcv_addr = pcie_serdes_addrs[dd->hfi1_id][i];
		sbus_request(dd, rcv_addr, 0x03, WRITE_SBUS_RECEIVER, 0);
		/* wait for interrupt to be processed */
		usleep_range(10000, 11000);
		pcie_vers[i] = sbus_read(dd, rcv_addr, 0x04, 0x0);
		if (i > 0 && pcie_vers[0] != pcie_vers[i])
			all_same = 0;
	}

	if (all_same) {
		dd_dev_info(dd, "PCIe SerDes firmware version 0x%x\n",
			    pcie_vers[0]);
	} else {
		dd_dev_warn(dd, "PCIe SerDes do not have the same firmware version\n");
		for (i = 0; i < NUM_PCIE_SERDES; i++) {
			dd_dev_info(dd,
				    "PCIe SerDes lane %d firmware version 0x%x\n",
				    i, pcie_vers[i]);
		}
	}

	/* read version for fabric SerDes */
	all_same = 1;
	fabric_vers[0] = 0;
	for (i = 0; i < NUM_FABRIC_SERDES; i++) {
		rcv_addr = fabric_serdes_addrs[dd->hfi1_id][i];
		sbus_request(dd, rcv_addr, 0x03, WRITE_SBUS_RECEIVER, 0);
		/* wait for interrupt to be processed */
		usleep_range(10000, 11000);
		fabric_vers[i] = sbus_read(dd, rcv_addr, 0x04, 0x0);
		if (i > 0 && fabric_vers[0] != fabric_vers[i])
			all_same = 0;
	}

	if (all_same) {
		dd_dev_info(dd, "Fabric SerDes firmware version 0x%x\n",
			    fabric_vers[0]);
	} else {
		dd_dev_warn(dd, "Fabric SerDes do not have the same firmware version\n");
		for (i = 0; i < NUM_FABRIC_SERDES; i++) {
			dd_dev_info(dd,
				    "Fabric SerDes lane %d firmware version 0x%x\n",
				    i, fabric_vers[i]);
		}
	}

	clear_sbus_fast_mode(dd);
	release_chip_resource(dd, CR_SBUS);
}