aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/fdomain.c
blob: fff682976c56202de49122628de392b35cfa737d (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
/* fdomain.c -- Future Domain TMC-16x0 SCSI driver
 * Created: Sun May  3 18:53:19 1992 by faith@cs.unc.edu
 * Revised: Mon Dec 28 21:59:02 1998 by faith@acm.org
 * Author: Rickard E. Faith, faith@cs.unc.edu
 * Copyright 1992-1996, 1998 Rickard E. Faith (faith@acm.org)
 * Shared IRQ supported added 7/7/2001  Alan Cox <alan@lxorguk.ukuu.org.uk>

 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.

 * 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.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.

 **************************************************************************

 SUMMARY:

 Future Domain BIOS versions supported for autodetect:
    2.0, 3.0, 3.2, 3.4 (1.0), 3.5 (2.0), 3.6, 3.61
 Chips are supported:
    TMC-1800, TMC-18C50, TMC-18C30, TMC-36C70
 Boards supported:
    Future Domain TMC-1650, TMC-1660, TMC-1670, TMC-1680, TMC-1610M/MER/MEX
    Future Domain TMC-3260 (PCI)
    Quantum ISA-200S, ISA-250MG
    Adaptec AHA-2920A (PCI) [BUT *NOT* AHA-2920C -- use aic7xxx instead]
    IBM ?
 LILO/INSMOD command-line options:
    fdomain=<PORT_BASE>,<IRQ>[,<ADAPTER_ID>]


    
 NOTE:

 The Adaptec AHA-2920C has an Adaptec AIC-7850 chip on it.
 Use the aic7xxx driver for this board.
       
 The Adaptec AHA-2920A has a Future Domain chip on it, so this is the right
 driver for that card.  Unfortunately, the boxes will probably just say
 "2920", so you'll have to look on the card for a Future Domain logo, or a
 letter after the 2920.

 
 
 THANKS:

 Thanks to Adaptec for providing PCI boards for testing.  This finally
 enabled me to test the PCI detection and correct it for PCI boards that do
 not have a BIOS at a standard ISA location.  For PCI boards, LILO/INSMOD
 command-line options should no longer be needed.  --RF 18Nov98


 
 DESCRIPTION:
 
 This is the Linux low-level SCSI driver for Future Domain TMC-1660/1680
 TMC-1650/1670, and TMC-3260 SCSI host adapters.  The 1650 and 1670 have a
 25-pin external connector, whereas the 1660 and 1680 have a SCSI-2 50-pin
 high-density external connector.  The 1670 and 1680 have floppy disk
 controllers built in.  The TMC-3260 is a PCI bus card.

 Future Domain's older boards are based on the TMC-1800 chip, and this
 driver was originally written for a TMC-1680 board with the TMC-1800 chip.
 More recently, boards are being produced with the TMC-18C50 and TMC-18C30
 chips.  The latest and greatest board may not work with this driver.  If
 you have to patch this driver so that it will recognize your board's BIOS
 signature, then the driver may fail to function after the board is
 detected.

 Please note that the drive ordering that Future Domain implemented in BIOS
 versions 3.4 and 3.5 is the opposite of the order (currently) used by the
 rest of the SCSI industry.  If you have BIOS version 3.4 or 3.5, and have
 more than one drive, then the drive ordering will be the reverse of that
 which you see under DOS.  For example, under DOS SCSI ID 0 will be D: and
 SCSI ID 1 will be C: (the boot device).  Under Linux, SCSI ID 0 will be
 /dev/sda and SCSI ID 1 will be /dev/sdb.  The Linux ordering is consistent
 with that provided by all the other SCSI drivers for Linux.  If you want
 this changed, you will probably have to patch the higher level SCSI code.
 If you do so, please send me patches that are protected by #ifdefs.

 If you have a TMC-8xx or TMC-9xx board, then this is not the driver for
 your board.  Please refer to the Seagate driver for more information and
 possible support.

 
 
 HISTORY:

 Linux       Driver      Driver
 Version     Version     Date         Support/Notes

             0.0          3 May 1992  V2.0 BIOS; 1800 chip
 0.97        1.9         28 Jul 1992
 0.98.6      3.1         27 Nov 1992
 0.99        3.2          9 Dec 1992

 0.99.3      3.3         10 Jan 1993  V3.0 BIOS
 0.99.5      3.5         18 Feb 1993
 0.99.10     3.6         15 May 1993  V3.2 BIOS; 18C50 chip
 0.99.11     3.17         3 Jul 1993  (now under RCS)
 0.99.12     3.18        13 Aug 1993
 0.99.14     5.6         31 Oct 1993  (reselection code removed)

 0.99.15     5.9         23 Jan 1994  V3.4 BIOS (preliminary)
 1.0.8/1.1.1 5.15         1 Apr 1994  V3.4 BIOS; 18C30 chip (preliminary)
 1.0.9/1.1.3 5.16         7 Apr 1994  V3.4 BIOS; 18C30 chip
 1.1.38      5.18        30 Jul 1994  36C70 chip (PCI version of 18C30)
 1.1.62      5.20         2 Nov 1994  V3.5 BIOS
 1.1.73      5.22         7 Dec 1994  Quantum ISA-200S board; V2.0 BIOS

 1.1.82      5.26        14 Jan 1995  V3.5 BIOS; TMC-1610M/MER/MEX board
 1.2.10      5.28         5 Jun 1995  Quantum ISA-250MG board; V2.0, V2.01 BIOS
 1.3.4       5.31        23 Jun 1995  PCI BIOS-32 detection (preliminary)
 1.3.7       5.33         4 Jul 1995  PCI BIOS-32 detection
 1.3.28      5.36        17 Sep 1995  V3.61 BIOS; LILO command-line support
 1.3.34      5.39        12 Oct 1995  V3.60 BIOS; /proc
 1.3.72      5.39         8 Feb 1996  Adaptec AHA-2920 board
 1.3.85      5.41         4 Apr 1996
 2.0.12      5.44         8 Aug 1996  Use ID 7 for all PCI cards
 2.1.1       5.45         2 Oct 1996  Update ROM accesses for 2.1.x
 2.1.97      5.46	 23 Apr 1998  Rewritten PCI detection routines [mj]
 2.1.11x     5.47	  9 Aug 1998  Touched for 8 SCSI disk majors support
             5.48        18 Nov 1998  BIOS no longer needed for PCI detection
 2.2.0       5.50        28 Dec 1998  Support insmod parameters
 

 REFERENCES USED:

 "TMC-1800 SCSI Chip Specification (FDC-1800T)", Future Domain Corporation,
 1990.

 "Technical Reference Manual: 18C50 SCSI Host Adapter Chip", Future Domain
 Corporation, January 1992.

 "LXT SCSI Products: Specifications and OEM Technical Manual (Revision
 B/September 1991)", Maxtor Corporation, 1991.

 "7213S product Manual (Revision P3)", Maxtor Corporation, 1992.

 "Draft Proposed American National Standard: Small Computer System
 Interface - 2 (SCSI-2)", Global Engineering Documents. (X3T9.2/86-109,
 revision 10h, October 17, 1991)

 Private communications, Drew Eckhardt (drew@cs.colorado.edu) and Eric
 Youngdale (ericy@cais.com), 1992.

 Private communication, Tuong Le (Future Domain Engineering department),
 1994. (Disk geometry computations for Future Domain BIOS version 3.4, and
 TMC-18C30 detection.)

 Hogan, Thom. The Programmer's PC Sourcebook. Microsoft Press, 1988. Page
 60 (2.39: Disk Partition Table Layout).

 "18C30 Technical Reference Manual", Future Domain Corporation, 1993, page
 6-1.


 
 NOTES ON REFERENCES:

 The Maxtor manuals were free.  Maxtor telephone technical support is
 great!

 The Future Domain manuals were $25 and $35.  They document the chip, not
 the TMC-16x0 boards, so some information I had to guess at.  In 1992,
 Future Domain sold DOS BIOS source for $250 and the UN*X driver source was
 $750, but these required a non-disclosure agreement, so even if I could
 have afforded them, they would *not* have been useful for writing this
 publicly distributable driver.  Future Domain technical support has
 provided some information on the phone and have sent a few useful FAXs.
 They have been much more helpful since they started to recognize that the
 word "Linux" refers to an operating system :-).

 

 ALPHA TESTERS:

 There are many other alpha testers that come and go as the driver
 develops.  The people listed here were most helpful in times of greatest
 need (mostly early on -- I've probably left out a few worthy people in
 more recent times):

 Todd Carrico (todd@wutc.wustl.edu), Dan Poirier (poirier@cs.unc.edu ), Ken
 Corey (kenc@sol.acs.unt.edu), C. de Bruin (bruin@bruin@sterbbs.nl), Sakari
 Aaltonen (sakaria@vipunen.hit.fi), John Rice (rice@xanth.cs.odu.edu), Brad
 Yearwood (brad@optilink.com), and Ray Toy (toy@soho.crd.ge.com).

 Special thanks to Tien-Wan Yang (twyang@cs.uh.edu), who graciously lent me
 his 18C50-based card for debugging.  He is the sole reason that this
 driver works with the 18C50 chip.

 Thanks to Dave Newman (dnewman@crl.com) for providing initial patches for
 the version 3.4 BIOS.

 Thanks to James T. McKinley (mckinley@msupa.pa.msu.edu) for providing
 patches that support the TMC-3260, a PCI bus card with the 36C70 chip.
 The 36C70 chip appears to be "completely compatible" with the 18C30 chip.

 Thanks to Eric Kasten (tigger@petroglyph.cl.msu.edu) for providing the
 patch for the version 3.5 BIOS.

 Thanks for Stephen Henson (shenson@nyx10.cs.du.edu) for providing the
 patch for the Quantum ISA-200S SCSI adapter.
 
 Thanks to Adam Bowen for the signature to the 1610M/MER/MEX scsi cards, to
 Martin Andrews (andrewm@ccfadm.eeg.ccf.org) for the signature to some
 random TMC-1680 repackaged by IBM; and to Mintak Ng (mintak@panix.com) for
 the version 3.61 BIOS signature.

 Thanks for Mark Singer (elf@netcom.com) and Richard Simpson
 (rsimpson@ewrcsdra.demon.co.uk) for more Quantum signatures and detective
 work on the Quantum RAM layout.

 Special thanks to James T. McKinley (mckinley@msupa.pa.msu.edu) for
 providing patches for proper PCI BIOS32-mediated detection of the TMC-3260
 card (a PCI bus card with the 36C70 chip).  Please send James PCI-related
 bug reports.

 Thanks to Tom Cavin (tec@usa1.com) for preliminary command-line option
 patches.

 New PCI detection code written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>

 Insmod parameter code based on patches from Daniel Graham
 <graham@balance.uoregon.edu>. 
 
 All of the alpha testers deserve much thanks.



 NOTES ON USER DEFINABLE OPTIONS:

 DEBUG: This turns on the printing of various debug information.

 ENABLE_PARITY: This turns on SCSI parity checking.  With the current
 driver, all attached devices must support SCSI parity.  If none of your
 devices support parity, then you can probably get the driver to work by
 turning this option off.  I have no way of testing this, however, and it
 would appear that no one ever uses this option.

 FIFO_COUNT: The host adapter has an 8K cache (host adapters based on the
 18C30 chip have a 2k cache).  When this many 512 byte blocks are filled by
 the SCSI device, an interrupt will be raised.  Therefore, this could be as
 low as 0, or as high as 16.  Note, however, that values which are too high
 or too low seem to prevent any interrupts from occurring, and thereby lock
 up the machine.  I have found that 2 is a good number, but throughput may
 be increased by changing this value to values which are close to 2.
 Please let me know if you try any different values.

 RESELECTION: This is no longer an option, since I gave up trying to
 implement it in version 4.x of this driver.  It did not improve
 performance at all and made the driver unstable (because I never found one
 of the two race conditions which were introduced by the multiple
 outstanding command code).  The instability seems a very high price to pay
 just so that you don't have to wait for the tape to rewind.  If you want
 this feature implemented, send me patches.  I'll be happy to send a copy
 of my (broken) driver to anyone who would like to see a copy.

 **************************************************************************/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/proc_fs.h>
#include <linux/pci.h>
#include <linux/stat.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <scsi/scsicam.h>


#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
#include "fdomain.h"

#ifndef PCMCIA
MODULE_AUTHOR("Rickard E. Faith");
MODULE_DESCRIPTION("Future domain SCSI driver");
MODULE_LICENSE("GPL");
#endif

  
#define VERSION          "$Revision: 5.51 $"

/* START OF USER DEFINABLE OPTIONS */

#define DEBUG            0	/* Enable debugging output */
#define ENABLE_PARITY    1	/* Enable SCSI Parity */
#define FIFO_COUNT       2	/* Number of 512 byte blocks before INTR */

/* END OF USER DEFINABLE OPTIONS */

#if DEBUG
#define EVERY_ACCESS     0	/* Write a line on every scsi access */
#define ERRORS_ONLY      1	/* Only write a line if there is an error */
#define DEBUG_DETECT     0	/* Debug fdomain_16x0_detect() */
#define DEBUG_MESSAGES   1	/* Debug MESSAGE IN phase */
#define DEBUG_ABORT      1	/* Debug abort() routine */
#define DEBUG_RESET      1	/* Debug reset() routine */
#define DEBUG_RACE       1      /* Debug interrupt-driven race condition */
#else
#define EVERY_ACCESS     0	/* LEAVE THESE ALONE--CHANGE THE ONES ABOVE */
#define ERRORS_ONLY      0
#define DEBUG_DETECT     0
#define DEBUG_MESSAGES   0
#define DEBUG_ABORT      0
#define DEBUG_RESET      0
#define DEBUG_RACE       0
#endif

/* Errors are reported on the line, so we don't need to report them again */
#if EVERY_ACCESS
#undef ERRORS_ONLY
#define ERRORS_ONLY      0
#endif

#if ENABLE_PARITY
#define PARITY_MASK      0x08
#else
#define PARITY_MASK      0x00
#endif

enum chip_type {
   unknown          = 0x00,
   tmc1800          = 0x01,
   tmc18c50         = 0x02,
   tmc18c30         = 0x03,
};

enum {
   in_arbitration   = 0x02,
   in_selection     = 0x04,
   in_other         = 0x08,
   disconnect       = 0x10,
   aborted          = 0x20,
   sent_ident       = 0x40,
};

enum in_port_type {
   Read_SCSI_Data   =  0,
   SCSI_Status      =  1,
   TMC_Status       =  2,
   FIFO_Status      =  3,	/* tmc18c50/tmc18c30 only */
   Interrupt_Cond   =  4,	/* tmc18c50/tmc18c30 only */
   LSB_ID_Code      =  5,
   MSB_ID_Code      =  6,
   Read_Loopback    =  7,
   SCSI_Data_NoACK  =  8,
   Interrupt_Status =  9,
   Configuration1   = 10,
   Configuration2   = 11,	/* tmc18c50/tmc18c30 only */
   Read_FIFO        = 12,
   FIFO_Data_Count  = 14
};

enum out_port_type {
   Write_SCSI_Data  =  0,
   SCSI_Cntl        =  1,
   Interrupt_Cntl   =  2,
   SCSI_Mode_Cntl   =  3,
   TMC_Cntl         =  4,
   Memory_Cntl      =  5,	/* tmc18c50/tmc18c30 only */
   Write_Loopback   =  7,
   IO_Control       = 11,	/* tmc18c30 only */
   Write_FIFO       = 12
};

/* .bss will zero all the static variables below */
static int               port_base;
static unsigned long     bios_base;
static void __iomem *    bios_mem;
static int               bios_major;
static int               bios_minor;
static int               PCI_bus;
#ifdef CONFIG_PCI
static struct pci_dev	*PCI_dev;
#endif
static int               Quantum;	/* Quantum board variant */
static int               interrupt_level;
static volatile int      in_command;
static struct scsi_cmnd  *current_SC;
static enum chip_type    chip              = unknown;
static int               adapter_mask;
static int               this_id;
static int               setup_called;

#if DEBUG_RACE
static volatile int      in_interrupt_flag;
#endif

static int               FIFO_Size = 0x2000; /* 8k FIFO for
						pre-tmc18c30 chips */

static irqreturn_t       do_fdomain_16x0_intr( int irq, void *dev_id );
/* Allow insmod parameters to be like LILO parameters.  For example:
   insmod fdomain fdomain=0x140,11 */
static char * fdomain = NULL;
module_param(fdomain, charp, 0);

#ifndef PCMCIA

static unsigned long addresses[] = {
   0xc8000,
   0xca000,
   0xce000,
   0xde000,
   0xcc000,		/* Extra addresses for PCI boards */
   0xd0000,
   0xe0000,
};
#define ADDRESS_COUNT ARRAY_SIZE(addresses)

static unsigned short ports[] = { 0x140, 0x150, 0x160, 0x170 };
#define PORT_COUNT ARRAY_SIZE(ports)

static unsigned short ints[] = { 3, 5, 10, 11, 12, 14, 15, 0 };

#endif /* !PCMCIA */

/*

  READ THIS BEFORE YOU ADD A SIGNATURE!

  READING THIS SHORT NOTE CAN SAVE YOU LOTS OF TIME!

  READ EVERY WORD, ESPECIALLY THE WORD *NOT*

  This driver works *ONLY* for Future Domain cards using the TMC-1800,
  TMC-18C50, or TMC-18C30 chip.  This includes models TMC-1650, 1660, 1670,
  and 1680.  These are all 16-bit cards.

  The following BIOS signature signatures are for boards which do *NOT*
  work with this driver (these TMC-8xx and TMC-9xx boards may work with the
  Seagate driver):

  FUTURE DOMAIN CORP. (C) 1986-1988 V4.0I 03/16/88
  FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89
  FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89
  FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90
  FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90
  FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90
  FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92

  (The cards which do *NOT* work are all 8-bit cards -- although some of
  them have a 16-bit form-factor, the upper 8-bits are used only for IRQs
  and are *NOT* used for data.  You can tell the difference by following
  the tracings on the circuit board -- if only the IRQ lines are involved,
  you have a "8-bit" card, and should *NOT* use this driver.)

*/

#ifndef PCMCIA

static struct signature {
   const char *signature;
   int  sig_offset;
   int  sig_length;
   int  major_bios_version;
   int  minor_bios_version;
   int  flag; /* 1 == PCI_bus, 2 == ISA_200S, 3 == ISA_250MG, 4 == ISA_200S */
} signatures[] = {
   /*          1         2         3         4         5         6 */
   /* 123456789012345678901234567890123456789012345678901234567890 */
   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.07/28/89",  5, 50,  2,  0, 0 },
   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V1.07/28/89",  5, 50,  2,  0, 0 },
   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.07/28/89", 72, 50,  2,  0, 2 },
   { "FUTURE DOMAIN CORP. (C) 1986-1990 1800-V2.0",        73, 43,  2,  0, 3 },
   { "FUTURE DOMAIN CORP. (C) 1991 1800-V2.0.",            72, 39,  2,  0, 4 },
   { "FUTURE DOMAIN CORP. (C) 1992 V3.00.004/02/92",        5, 44,  3,  0, 0 },
   { "FUTURE DOMAIN TMC-18XX (C) 1993 V3.203/12/93",        5, 44,  3,  2, 0 },
   { "IBM F1 P2 BIOS v1.0104/29/93",                        5, 28,  3, -1, 0 },
   { "Future Domain Corp. V1.0008/18/93",                   5, 33,  3,  4, 0 },
   { "Future Domain Corp. V1.0008/18/93",                  26, 33,  3,  4, 1 },
   { "Adaptec AHA-2920 PCI-SCSI Card",                     42, 31,  3, -1, 1 },
   { "IBM F1 P264/32",                                      5, 14,  3, -1, 1 },
				/* This next signature may not be a 3.5 bios */
   { "Future Domain Corp. V2.0108/18/93",                   5, 33,  3,  5, 0 },
   { "FUTURE DOMAIN CORP.  V3.5008/18/93",                  5, 34,  3,  5, 0 },
   { "FUTURE DOMAIN 18c30/18c50/1800 (C) 1994 V3.5",        5, 44,  3,  5, 0 },
   { "FUTURE DOMAIN CORP.  V3.6008/18/93",                  5, 34,  3,  6, 0 },
   { "FUTURE DOMAIN CORP.  V3.6108/18/93",                  5, 34,  3,  6, 0 },
   { "FUTURE DOMAIN TMC-18XX",                              5, 22, -1, -1, 0 },

   /* READ NOTICE ABOVE *BEFORE* YOU WASTE YOUR TIME ADDING A SIGNATURE
    Also, fix the disk geometry code for your signature and send your
    changes for faith@cs.unc.edu.  Above all, do *NOT* change any old
    signatures!

    Note that the last line will match a "generic" 18XX bios.  Because
    Future Domain has changed the host SCSI ID and/or the location of the
    geometry information in the on-board RAM area for each of the first
    three BIOS's, it is still important to enter a fully qualified
    signature in the table for any new BIOS's (after the host SCSI ID and
    geometry location are verified). */
};

#define SIGNATURE_COUNT ARRAY_SIZE(signatures)

#endif /* !PCMCIA */

static void print_banner( struct Scsi_Host *shpnt )
{
   if (!shpnt) return;		/* This won't ever happen */

   if (bios_major < 0 && bios_minor < 0) {
      printk(KERN_INFO "scsi%d: <fdomain> No BIOS; using scsi id %d\n",
	      shpnt->host_no, shpnt->this_id);
   } else {
      printk(KERN_INFO "scsi%d: <fdomain> BIOS version ", shpnt->host_no);

      if (bios_major >= 0) printk("%d.", bios_major);
      else                 printk("?.");

      if (bios_minor >= 0) printk("%d", bios_minor);
      else                 printk("?.");

      printk( " at 0x%lx using scsi id %d\n",
	      bios_base, shpnt->this_id );
   }

				/* If this driver works for later FD PCI
				   boards, we will have to modify banner
				   for additional PCI cards, but for now if
				   it's PCI it's a TMC-3260 - JTM */
   printk(KERN_INFO "scsi%d: <fdomain> %s chip at 0x%x irq ",
	   shpnt->host_no,
	   chip == tmc1800 ? "TMC-1800" : (chip == tmc18c50 ? "TMC-18C50" : (chip == tmc18c30 ? (PCI_bus ? "TMC-36C70 (PCI bus)" : "TMC-18C30") : "Unknown")),
	   port_base);

   if (interrupt_level)
   	printk("%d", interrupt_level);
   else
        printk("<none>");

   printk( "\n" );
}

int fdomain_setup(char *str)
{
	int ints[4];

	(void)get_options(str, ARRAY_SIZE(ints), ints);

	if (setup_called++ || ints[0] < 2 || ints[0] > 3) {
		printk(KERN_INFO "scsi: <fdomain> Usage: fdomain=<PORT_BASE>,<IRQ>[,<ADAPTER_ID>]\n");
		printk(KERN_ERR "scsi: <fdomain> Bad LILO/INSMOD parameters?\n");
		return 0;
	}

	port_base       = ints[0] >= 1 ? ints[1] : 0;
	interrupt_level = ints[0] >= 2 ? ints[2] : 0;
	this_id         = ints[0] >= 3 ? ints[3] : 0;
   
	bios_major = bios_minor = -1; /* Use geometry for BIOS version >= 3.4 */
	++setup_called;
	return 1;
}

__setup("fdomain=", fdomain_setup);


static void do_pause(unsigned amount)	/* Pause for amount*10 milliseconds */
{
	mdelay(10*amount);
}

static inline void fdomain_make_bus_idle( void )
{
   outb(0, port_base + SCSI_Cntl);
   outb(0, port_base + SCSI_Mode_Cntl);
   if (chip == tmc18c50 || chip == tmc18c30)
	 outb(0x21 | PARITY_MASK, port_base + TMC_Cntl); /* Clear forced intr. */
   else
	 outb(0x01 | PARITY_MASK, port_base + TMC_Cntl);
}

static int fdomain_is_valid_port( int port )
{
#if DEBUG_DETECT 
   printk( " (%x%x),",
	   inb( port + MSB_ID_Code ), inb( port + LSB_ID_Code ) );
#endif

   /* The MCA ID is a unique id for each MCA compatible board.  We
      are using ISA boards, but Future Domain provides the MCA ID
      anyway.  We can use this ID to ensure that this is a Future
      Domain TMC-1660/TMC-1680.
    */

   if (inb( port + LSB_ID_Code ) != 0xe9) { /* test for 0x6127 id */
      if (inb( port + LSB_ID_Code ) != 0x27) return 0;
      if (inb( port + MSB_ID_Code ) != 0x61) return 0;
      chip = tmc1800;
   } else {				    /* test for 0xe960 id */
      if (inb( port + MSB_ID_Code ) != 0x60) return 0;
      chip = tmc18c50;

				/* Try to toggle 32-bit mode.  This only
				   works on an 18c30 chip.  (User reports
				   say this works, so we should switch to
				   it in the near future.) */

      outb( 0x80, port + IO_Control );
      if ((inb( port + Configuration2 ) & 0x80) == 0x80) {
	 outb( 0x00, port + IO_Control );
	 if ((inb( port + Configuration2 ) & 0x80) == 0x00) {
	    chip = tmc18c30;
	    FIFO_Size = 0x800;	/* 2k FIFO */
	 }
      }
				/* If that failed, we are an 18c50. */
   }

   return 1;
}

static int fdomain_test_loopback( void )
{
   int i;
   int result;

   for (i = 0; i < 255; i++) {
      outb( i, port_base + Write_Loopback );
      result = inb( port_base + Read_Loopback );
      if (i != result)
	    return 1;
   }
   return 0;
}

#ifndef PCMCIA

/* fdomain_get_irq assumes that we have a valid MCA ID for a
   TMC-1660/TMC-1680 Future Domain board.  Now, check to be sure the
   bios_base matches these ports.  If someone was unlucky enough to have
   purchased more than one Future Domain board, then they will have to
   modify this code, as we only detect one board here.  [The one with the
   lowest bios_base.]

   Note that this routine is only used for systems without a PCI BIOS32
   (e.g., ISA bus).  For PCI bus systems, this routine will likely fail
   unless one of the IRQs listed in the ints array is used by the board.
   Sometimes it is possible to use the computer's BIOS setup screen to
   configure a PCI system so that one of these IRQs will be used by the
   Future Domain card. */

static int fdomain_get_irq( int base )
{
   int options = inb(base + Configuration1);

#if DEBUG_DETECT
   printk("scsi: <fdomain> Options = %x\n", options);
#endif
 
   /* Check for board with lowest bios_base --
      this isn't valid for the 18c30 or for
      boards on the PCI bus, so just assume we
      have the right board. */

   if (chip != tmc18c30 && !PCI_bus && addresses[(options & 0xc0) >> 6 ] != bios_base)
   	return 0;
   return ints[(options & 0x0e) >> 1];
}

static int fdomain_isa_detect( int *irq, int *iobase )
{
   int i, j;
   int base = 0xdeadbeef;
   int flag = 0;

#if DEBUG_DETECT
   printk( "scsi: <fdomain> fdomain_isa_detect:" );
#endif

   for (i = 0; i < ADDRESS_COUNT; i++) {
      void __iomem *p = ioremap(addresses[i], 0x2000);
      if (!p)
	continue;
#if DEBUG_DETECT
      printk( " %lx(%lx),", addresses[i], bios_base );
#endif
      for (j = 0; j < SIGNATURE_COUNT; j++) {
	 if (check_signature(p + signatures[j].sig_offset,
			     signatures[j].signature,
			     signatures[j].sig_length )) {
	    bios_major = signatures[j].major_bios_version;
	    bios_minor = signatures[j].minor_bios_version;
	    PCI_bus    = (signatures[j].flag == 1);
	    Quantum    = (signatures[j].flag > 1) ? signatures[j].flag : 0;
	    bios_base  = addresses[i];
	    bios_mem   = p;
	    goto found;
	 }
      }
      iounmap(p);
   }
 
found:
   if (bios_major == 2) {
      /* The TMC-1660/TMC-1680 has a RAM area just after the BIOS ROM.
	 Assuming the ROM is enabled (otherwise we wouldn't have been
	 able to read the ROM signature :-), then the ROM sets up the
	 RAM area with some magic numbers, such as a list of port
	 base addresses and a list of the disk "geometry" reported to
	 DOS (this geometry has nothing to do with physical geometry).
       */

      switch (Quantum) {
      case 2:			/* ISA_200S */
      case 3:			/* ISA_250MG */
	 base = readb(bios_mem + 0x1fa2) + (readb(bios_mem + 0x1fa3) << 8);
	 break;
      case 4:			/* ISA_200S (another one) */
	 base = readb(bios_mem + 0x1fa3) + (readb(bios_mem + 0x1fa4) << 8);
	 break;
      default:
	 base = readb(bios_mem + 0x1fcc) + (readb(bios_mem + 0x1fcd) << 8);
	 break;
      }
   
#if DEBUG_DETECT
      printk( " %x,", base );
#endif

      for (i = 0; i < PORT_COUNT; i++) {
	if (base == ports[i]) {
		if (!request_region(base, 0x10, "fdomain"))
			break;
		if (!fdomain_is_valid_port(base)) {
			release_region(base, 0x10);
			break;
		}
		*irq    = fdomain_get_irq( base );
		*iobase = base;
		return 1;
	}
      }

      /* This is a bad sign.  It usually means that someone patched the
	 BIOS signature list (the signatures variable) to contain a BIOS
	 signature for a board *OTHER THAN* the TMC-1660/TMC-1680. */
      
#if DEBUG_DETECT
      printk( " RAM FAILED, " );
#endif
   }

   /* Anyway, the alternative to finding the address in the RAM is to just
      search through every possible port address for one that is attached
      to the Future Domain card.  Don't panic, though, about reading all
      these random port addresses -- there are rumors that the Future
      Domain BIOS does something very similar.

      Do not, however, check ports which the kernel knows are being used by
      another driver. */

   for (i = 0; i < PORT_COUNT; i++) {
      base = ports[i];
      if (!request_region(base, 0x10, "fdomain")) {
#if DEBUG_DETECT
	 printk( " (%x inuse),", base );
#endif
	 continue;
      }
#if DEBUG_DETECT
      printk( " %x,", base );
#endif
      flag = fdomain_is_valid_port(base);
      if (flag)
	break;
      release_region(base, 0x10);
   }

#if DEBUG_DETECT
   if (flag) printk( " SUCCESS\n" );
   else      printk( " FAILURE\n" );
#endif

   if (!flag) return 0;		/* iobase not found */

   *irq    = fdomain_get_irq( base );
   *iobase = base;

   return 1;			/* success */
}

#else /* PCMCIA */

static int fdomain_isa_detect( int *irq, int *iobase )
{
	if (irq)
		*irq = 0;
	if (iobase)
		*iobase = 0;
	return 0;
}

#endif /* !PCMCIA */


/* PCI detection function: int fdomain_pci_bios_detect(int* irq, int*
   iobase) This function gets the Interrupt Level and I/O base address from
   the PCI configuration registers. */

#ifdef CONFIG_PCI
static int fdomain_pci_bios_detect( int *irq, int *iobase, struct pci_dev **ret_pdev )
{
   unsigned int     pci_irq;                /* PCI interrupt line */
   unsigned long    pci_base;               /* PCI I/O base address */
   struct pci_dev   *pdev = NULL;

#if DEBUG_DETECT
   /* Tell how to print a list of the known PCI devices from bios32 and
      list vendor and device IDs being used if in debug mode.  */
      
   printk( "scsi: <fdomain> INFO: use lspci -v to see list of PCI devices\n" );
   printk( "scsi: <fdomain> TMC-3260 detect:"
	   " Using Vendor ID: 0x%x and Device ID: 0x%x\n",
	   PCI_VENDOR_ID_FD, 
	   PCI_DEVICE_ID_FD_36C70 );
#endif 

   if ((pdev = pci_get_device(PCI_VENDOR_ID_FD, PCI_DEVICE_ID_FD_36C70, pdev)) == NULL)
		return 0;
   if (pci_enable_device(pdev))
   	goto fail;
       
#if DEBUG_DETECT
   printk( "scsi: <fdomain> TMC-3260 detect:"
	   " PCI bus %u, device %u, function %u\n",
	   pdev->bus->number,
	   PCI_SLOT(pdev->devfn),
	   PCI_FUNC(pdev->devfn));
#endif

   /* We now have the appropriate device function for the FD board so we
      just read the PCI config info from the registers.  */

   pci_base = pci_resource_start(pdev, 0);
   pci_irq = pdev->irq;

   if (!request_region( pci_base, 0x10, "fdomain" ))
   	goto fail;

   /* Now we have the I/O base address and interrupt from the PCI
      configuration registers. */

   *irq    = pci_irq;
   *iobase = pci_base;
   *ret_pdev = pdev;

#if DEBUG_DETECT
   printk( "scsi: <fdomain> TMC-3260 detect:"
	   " IRQ = %d, I/O base = 0x%x [0x%lx]\n", *irq, *iobase, pci_base );
#endif

   if (!fdomain_is_valid_port(pci_base)) {
      printk(KERN_ERR "scsi: <fdomain> PCI card detected, but driver not loaded (invalid port)\n" );
      release_region(pci_base, 0x10);
      goto fail;
   }

				/* Fill in a few global variables.  Ugh. */
   bios_major = bios_minor = -1;
   PCI_bus    = 1;
   PCI_dev    = pdev;
   Quantum    = 0;
   bios_base  = 0;
   
   return 1;
fail:
   pci_dev_put(pdev);
   return 0;
}

#endif

struct Scsi_Host *__fdomain_16x0_detect(struct scsi_host_template *tpnt )
{
   int              retcode;
   struct Scsi_Host *shpnt;
   struct pci_dev *pdev = NULL;

   if (setup_called) {
#if DEBUG_DETECT
      printk( "scsi: <fdomain> No BIOS, using port_base = 0x%x, irq = %d\n",
	      port_base, interrupt_level );
#endif
      if (!request_region(port_base, 0x10, "fdomain")) {
	 printk( "scsi: <fdomain> port 0x%x is busy\n", port_base );
	 printk( "scsi: <fdomain> Bad LILO/INSMOD parameters?\n" );
	 return NULL;
      }
      if (!fdomain_is_valid_port( port_base )) {
	 printk( "scsi: <fdomain> Cannot locate chip at port base 0x%x\n",
		 port_base );
	 printk( "scsi: <fdomain> Bad LILO/INSMOD parameters?\n" );
	 release_region(port_base, 0x10);
	 return NULL;
      }
   } else {
      int flag = 0;

#ifdef CONFIG_PCI
				/* Try PCI detection first */
      flag = fdomain_pci_bios_detect( &interrupt_level, &port_base, &pdev );
#endif
      if (!flag) {
				/* Then try ISA bus detection */
	 flag = fdomain_isa_detect( &interrupt_level, &port_base );

	 if (!flag) {
	    printk( "scsi: <fdomain> Detection failed (no card)\n" );
	    return NULL;
	 }
      }
   }

   fdomain_16x0_bus_reset(NULL);

   if (fdomain_test_loopback()) {
      printk(KERN_ERR  "scsi: <fdomain> Detection failed (loopback test failed at port base 0x%x)\n", port_base);
      if (setup_called) {
	 printk(KERN_ERR "scsi: <fdomain> Bad LILO/INSMOD parameters?\n");
      }
      goto fail;
   }

   if (this_id) {
      tpnt->this_id = (this_id & 0x07);
      adapter_mask  = (1 << tpnt->this_id);
   } else {
      if (PCI_bus || (bios_major == 3 && bios_minor >= 2) || bios_major < 0) {
	 tpnt->this_id = 7;
	 adapter_mask  = 0x80;
      } else {
	 tpnt->this_id = 6;
	 adapter_mask  = 0x40;
      }
   }

/* Print out a banner here in case we can't
   get resources.  */

   shpnt = scsi_register( tpnt, 0 );
   if(shpnt == NULL) {
	release_region(port_base, 0x10);
   	return NULL;
   }
   shpnt->irq = interrupt_level;
   shpnt->io_port = port_base;
   shpnt->n_io_port = 0x10;
   print_banner( shpnt );

   /* Log IRQ with kernel */   
   if (!interrupt_level) {
      printk(KERN_ERR "scsi: <fdomain> Card Detected, but driver not loaded (no IRQ)\n" );
      goto fail;
   } else {
      /* Register the IRQ with the kernel */

      retcode = request_irq( interrupt_level,
			     do_fdomain_16x0_intr, pdev?IRQF_SHARED:0, "fdomain", shpnt);

      if (retcode < 0) {
	 if (retcode == -EINVAL) {
	    printk(KERN_ERR "scsi: <fdomain> IRQ %d is bad!\n", interrupt_level );
	    printk(KERN_ERR "                This shouldn't happen!\n" );
	    printk(KERN_ERR "                Send mail to faith@acm.org\n" );
	 } else if (retcode == -EBUSY) {
	    printk(KERN_ERR "scsi: <fdomain> IRQ %d is already in use!\n", interrupt_level );
	    printk(KERN_ERR "                Please use another IRQ!\n" );
	 } else {
	    printk(KERN_ERR "scsi: <fdomain> Error getting IRQ %d\n", interrupt_level );
	    printk(KERN_ERR "                This shouldn't happen!\n" );
	    printk(KERN_ERR "                Send mail to faith@acm.org\n" );
	 }
	 printk(KERN_ERR "scsi: <fdomain> Detected, but driver not loaded (IRQ)\n" );
	 goto fail;
      }
   }
   return shpnt;
fail:
   pci_dev_put(pdev);
   release_region(port_base, 0x10);
   return NULL;
}

static int fdomain_16x0_detect(struct scsi_host_template *tpnt)
{
	if (fdomain)
		fdomain_setup(fdomain);
	return (__fdomain_16x0_detect(tpnt) != NULL);
}

static const char *fdomain_16x0_info( struct Scsi_Host *ignore )
{
   static char buffer[128];
   char        *pt;
   
   strcpy( buffer, "Future Domain 16-bit SCSI Driver Version" );
   if (strchr( VERSION, ':')) { /* Assume VERSION is an RCS Revision string */
      strcat( buffer, strchr( VERSION, ':' ) + 1 );
      pt = strrchr( buffer, '$') - 1;
      if (!pt)  		/* Stripped RCS Revision string? */
	    pt = buffer + strlen( buffer ) - 1;
      if (*pt != ' ')
	    ++pt;
      *pt = '\0';
   } else {			/* Assume VERSION is a number */
      strcat( buffer, " " VERSION );
   }
      
   return buffer;
}

#if 0
static int fdomain_arbitrate( void )
{
   int           status = 0;
   unsigned long timeout;

#if EVERY_ACCESS
   printk( "fdomain_arbitrate()\n" );
#endif
   
   outb(0x00, port_base + SCSI_Cntl);              /* Disable data drivers */
   outb(adapter_mask, port_base + SCSI_Data_NoACK); /* Set our id bit */
   outb(0x04 | PARITY_MASK, port_base + TMC_Cntl); /* Start arbitration */

   timeout = 500;
   do {
      status = inb(port_base + TMC_Status);        /* Read adapter status */
      if (status & 0x02)		      /* Arbitration complete */
	    return 0;
      mdelay(1);			/* Wait one millisecond */
   } while (--timeout);

   /* Make bus idle */
   fdomain_make_bus_idle();

#if EVERY_ACCESS
   printk( "Arbitration failed, status = %x\n", status );
#endif
#if ERRORS_ONLY
   printk( "scsi: <fdomain> Arbitration failed, status = %x\n", status );
#endif
   return 1;
}
#endif

static int fdomain_select( int target )
{
   int           status;
   unsigned long timeout;
#if ERRORS_ONLY
   static int    flag = 0;
#endif

   outb(0x82, port_base + SCSI_Cntl); /* Bus Enable + Select */
   outb(adapter_mask | (1 << target), port_base + SCSI_Data_NoACK);

   /* Stop arbitration and enable parity */
   outb(PARITY_MASK, port_base + TMC_Cntl); 

   timeout = 350;			/* 350 msec */

   do {
      status = inb(port_base + SCSI_Status); /* Read adapter status */
      if (status & 1) {			/* Busy asserted */
	 /* Enable SCSI Bus (on error, should make bus idle with 0) */
	 outb(0x80, port_base + SCSI_Cntl);
	 return 0;
      }
      mdelay(1);			/* wait one msec */
   } while (--timeout);
   /* Make bus idle */
   fdomain_make_bus_idle();
#if EVERY_ACCESS
   if (!target) printk( "Selection failed\n" );
#endif
#if ERRORS_ONLY
   if (!target) {
      if (!flag) /* Skip first failure for all chips. */
	    ++flag;
      else
	    printk( "scsi: <fdomain> Selection failed\n" );
   }
#endif
   return 1;
}

static void my_done(int error)
{
   if (in_command) {
      in_command = 0;
      outb(0x00, port_base + Interrupt_Cntl);
      fdomain_make_bus_idle();
      current_SC->result = error;
      if (current_SC->scsi_done)
	    current_SC->scsi_done( current_SC );
      else panic( "scsi: <fdomain> current_SC->scsi_done() == NULL" );
   } else {
      panic( "scsi: <fdomain> my_done() called outside of command\n" );
   }
#if DEBUG_RACE
   in_interrupt_flag = 0;
#endif
}

static irqreturn_t do_fdomain_16x0_intr(int irq, void *dev_id)
{
   unsigned long flags;
   int      status;
   int      done = 0;
   unsigned data_count;

				/* The fdomain_16x0_intr is only called via
				   the interrupt handler.  The goal of the
				   sti() here is to allow other
				   interruptions while this routine is
				   running. */

   /* Check for other IRQ sources */
   if ((inb(port_base + TMC_Status) & 0x01) == 0)
   	return IRQ_NONE;

   /* It is our IRQ */   	
   outb(0x00, port_base + Interrupt_Cntl);

   /* We usually have one spurious interrupt after each command.  Ignore it. */
   if (!in_command || !current_SC) {	/* Spurious interrupt */
#if EVERY_ACCESS
      printk( "Spurious interrupt, in_command = %d, current_SC = %x\n",
	      in_command, current_SC );
#endif
      return IRQ_NONE;
   }

   /* Abort calls my_done, so we do nothing here. */
   if (current_SC->SCp.phase & aborted) {
#if DEBUG_ABORT
      printk( "scsi: <fdomain> Interrupt after abort, ignoring\n" );
#endif
      /*
      return IRQ_HANDLED; */
   }

#if DEBUG_RACE
   ++in_interrupt_flag;
#endif

   if (current_SC->SCp.phase & in_arbitration) {
      status = inb(port_base + TMC_Status);        /* Read adapter status */
      if (!(status & 0x02)) {
#if EVERY_ACCESS
	 printk( " AFAIL " );
#endif
         spin_lock_irqsave(current_SC->device->host->host_lock, flags);
	 my_done( DID_BUS_BUSY << 16 );
         spin_unlock_irqrestore(current_SC->device->host->host_lock, flags);
	 return IRQ_HANDLED;
      }
      current_SC->SCp.phase = in_selection;
      
      outb(0x40 | FIFO_COUNT, port_base + Interrupt_Cntl);

      outb(0x82, port_base + SCSI_Cntl); /* Bus Enable + Select */
      outb(adapter_mask | (1 << scmd_id(current_SC)), port_base + SCSI_Data_NoACK);
      
      /* Stop arbitration and enable parity */
      outb(0x10 | PARITY_MASK, port_base + TMC_Cntl);
#if DEBUG_RACE
      in_interrupt_flag = 0;
#endif
      return IRQ_HANDLED;
   } else if (current_SC->SCp.phase & in_selection) {
      status = inb(port_base + SCSI_Status);
      if (!(status & 0x01)) {
	 /* Try again, for slow devices */
	 if (fdomain_select( scmd_id(current_SC) )) {
#if EVERY_ACCESS
	    printk( " SFAIL " );
#endif
            spin_lock_irqsave(current_SC->device->host->host_lock, flags);
	    my_done( DID_NO_CONNECT << 16 );
            spin_unlock_irqrestore(current_SC->device->host->host_lock, flags);
	    return IRQ_HANDLED;
	 } else {
#if EVERY_ACCESS
	    printk( " AltSel " );
#endif
	    /* Stop arbitration and enable parity */
	    outb(0x10 | PARITY_MASK, port_base + TMC_Cntl);
	 }
      }
      current_SC->SCp.phase = in_other;
      outb(0x90 | FIFO_COUNT, port_base + Interrupt_Cntl);
      outb(0x80, port_base + SCSI_Cntl);
#if DEBUG_RACE
      in_interrupt_flag = 0;
#endif
      return IRQ_HANDLED;
   }
   
   /* current_SC->SCp.phase == in_other: this is the body of the routine */
   
   status = inb(port_base + SCSI_Status);
   
   if (status & 0x10) {	/* REQ */
      
      switch (status & 0x0e) {
       
      case 0x08:		/* COMMAND OUT */
	 outb(current_SC->cmnd[current_SC->SCp.sent_command++],
	      port_base + Write_SCSI_Data);
#if EVERY_ACCESS
	 printk( "CMD = %x,",
		 current_SC->cmnd[ current_SC->SCp.sent_command - 1] );
#endif
	 break;
      case 0x00:		/* DATA OUT -- tmc18c50/tmc18c30 only */
	 if (chip != tmc1800 && !current_SC->SCp.have_data_in) {
	    current_SC->SCp.have_data_in = -1;
	    outb(0xd0 | PARITY_MASK, port_base + TMC_Cntl);
	 }
	 break;
      case 0x04:		/* DATA IN -- tmc18c50/tmc18c30 only */
	 if (chip != tmc1800 && !current_SC->SCp.have_data_in) {
	    current_SC->SCp.have_data_in = 1;
	    outb(0x90 | PARITY_MASK, port_base + TMC_Cntl);
	 }
	 break;
      case 0x0c:		/* STATUS IN */
	 current_SC->SCp.Status = inb(port_base + Read_SCSI_Data);
#if EVERY_ACCESS
	 printk( "Status = %x, ", current_SC->SCp.Status );
#endif
#if ERRORS_ONLY
	 if (current_SC->SCp.Status
	     && current_SC->SCp.Status != 2
	     && current_SC->SCp.Status != 8) {
	    printk( "scsi: <fdomain> target = %d, command = %x, status = %x\n",
		    current_SC->device->id,
		    current_SC->cmnd[0],
		    current_SC->SCp.Status );
	 }
#endif
	       break;
      case 0x0a:		/* MESSAGE OUT */
	 outb(MESSAGE_REJECT, port_base + Write_SCSI_Data); /* Reject */
	 break;
      case 0x0e:		/* MESSAGE IN */
	 current_SC->SCp.Message = inb(port_base + Read_SCSI_Data);
#if EVERY_ACCESS
	 printk( "Message = %x, ", current_SC->SCp.Message );
#endif
	 if (!current_SC->SCp.Message) ++done;
#if DEBUG_MESSAGES || EVERY_ACCESS
	 if (current_SC->SCp.Message) {
	    printk( "scsi: <fdomain> message = %x\n",
		    current_SC->SCp.Message );
	 }
#endif
	 break;
      }
   }

   if (chip == tmc1800 && !current_SC->SCp.have_data_in
       && (current_SC->SCp.sent_command >= current_SC->cmd_len)) {
      
      if(current_SC->sc_data_direction == DMA_TO_DEVICE)
      {
	 current_SC->SCp.have_data_in = -1;
	 outb(0xd0 | PARITY_MASK, port_base + TMC_Cntl);
      }
      else
      {
	 current_SC->SCp.have_data_in = 1;
	 outb(0x90 | PARITY_MASK, port_base + TMC_Cntl);
      }
   }

   if (current_SC->SCp.have_data_in == -1) { /* DATA OUT */
      while ((data_count = FIFO_Size - inw(port_base + FIFO_Data_Count)) > 512) {
#if EVERY_ACCESS
	 printk( "DC=%d, ", data_count ) ;
#endif
	 if (data_count > current_SC->SCp.this_residual)
	       data_count = current_SC->SCp.this_residual;
	 if (data_count > 0) {
#if EVERY_ACCESS
	    printk( "%d OUT, ", data_count );
#endif
	    if (data_count == 1) {
	       outb(*current_SC->SCp.ptr++, port_base + Write_FIFO);
	       --current_SC->SCp.this_residual;
	    } else {
	       data_count >>= 1;
	       outsw(port_base + Write_FIFO, current_SC->SCp.ptr, data_count);
	       current_SC->SCp.ptr += 2 * data_count;
	       current_SC->SCp.this_residual -= 2 * data_count;
	    }
	 }
	 if (!current_SC->SCp.this_residual) {
	    if (current_SC->SCp.buffers_residual) {
	       --current_SC->SCp.buffers_residual;
	       ++current_SC->SCp.buffer;
	       current_SC->SCp.ptr = sg_virt(current_SC->SCp.buffer);
	       current_SC->SCp.this_residual = current_SC->SCp.buffer->length;
	    } else
		  break;
	 }
      }
   }
   
   if (current_SC->SCp.have_data_in == 1) { /* DATA IN */
      while ((data_count = inw(port_base + FIFO_Data_Count)) > 0) {
#if EVERY_ACCESS
	 printk( "DC=%d, ", data_count );
#endif
	 if (data_count > current_SC->SCp.this_residual)
	       data_count = current_SC->SCp.this_residual;
	 if (data_count) {
#if EVERY_ACCESS
	    printk( "%d IN, ", data_count );
#endif
	    if (data_count == 1) {
	       *current_SC->SCp.ptr++ = inb(port_base + Read_FIFO);
	       --current_SC->SCp.this_residual;
	    } else {
	       data_count >>= 1; /* Number of words */
	       insw(port_base + Read_FIFO, current_SC->SCp.ptr, data_count);
	       current_SC->SCp.ptr += 2 * data_count;
	       current_SC->SCp.this_residual -= 2 * data_count;
	    }
	 }
	 if (!current_SC->SCp.this_residual
	     && current_SC->SCp.buffers_residual) {
	    --current_SC->SCp.buffers_residual;
	    ++current_SC->SCp.buffer;
	    current_SC->SCp.ptr = sg_virt(current_SC->SCp.buffer);
	    current_SC->SCp.this_residual = current_SC->SCp.buffer->length;
	 }
      }
   }
   
   if (done) {
#if EVERY_ACCESS
      printk( " ** IN DONE %d ** ", current_SC->SCp.have_data_in );
#endif

#if ERRORS_ONLY
      if (current_SC->cmnd[0] == REQUEST_SENSE && !current_SC->SCp.Status) {
	      char *buf = scsi_sglist(current_SC);
	 if ((unsigned char)(*(buf + 2)) & 0x0f) {
	    unsigned char key;
	    unsigned char code;
	    unsigned char qualifier;

	    key = (unsigned char)(*(buf + 2)) & 0x0f;
	    code = (unsigned char)(*(buf + 12));
	    qualifier = (unsigned char)(*(buf + 13));

	    if (key != UNIT_ATTENTION
		&& !(key == NOT_READY
		     && code == 0x04
		     && (!qualifier || qualifier == 0x02 || qualifier == 0x01))
		&& !(key == ILLEGAL_REQUEST && (code == 0x25
						|| code == 0x24
						|| !code)))
		  
		  printk( "scsi: <fdomain> REQUEST SENSE"
			  " Key = %x, Code = %x, Qualifier = %x\n",
			  key, code, qualifier );
	 }
      }
#endif
#if EVERY_ACCESS
      printk( "BEFORE MY_DONE. . ." );
#endif
      spin_lock_irqsave(current_SC->device->host->host_lock, flags);
      my_done( (current_SC->SCp.Status & 0xff)
	       | ((current_SC->SCp.Message & 0xff) << 8) | (DID_OK << 16) );
      spin_unlock_irqrestore(current_SC->device->host->host_lock, flags);
#if EVERY_ACCESS
      printk( "RETURNING.\n" );
#endif
      
   } else {
      if (current_SC->SCp.phase & disconnect) {
	 outb(0xd0 | FIFO_COUNT, port_base + Interrupt_Cntl);
	 outb(0x00, port_base + SCSI_Cntl);
      } else {
	 outb(0x90 | FIFO_COUNT, port_base + Interrupt_Cntl);
      }
   }
#if DEBUG_RACE
   in_interrupt_flag = 0;
#endif
   return IRQ_HANDLED;
}

static int fdomain_16x0_queue_lck(struct scsi_cmnd *SCpnt,
		void (*done)(struct scsi_cmnd *))
{
   if (in_command) {
      panic( "scsi: <fdomain> fdomain_16x0_queue() NOT REENTRANT!\n" );
   }
#if EVERY_ACCESS
   printk( "queue: target = %d cmnd = 0x%02x pieces = %d size = %u\n",
	   SCpnt->target,
	   *(unsigned char *)SCpnt->cmnd,
	   scsi_sg_count(SCpnt),
	   scsi_bufflen(SCpnt));
#endif

   fdomain_make_bus_idle();

   current_SC            = SCpnt; /* Save this for the done function */
   current_SC->scsi_done = done;

   /* Initialize static data */

   if (scsi_sg_count(current_SC)) {
	   current_SC->SCp.buffer = scsi_sglist(current_SC);
	   current_SC->SCp.ptr = sg_virt(current_SC->SCp.buffer);
	   current_SC->SCp.this_residual    = current_SC->SCp.buffer->length;
	   current_SC->SCp.buffers_residual = scsi_sg_count(current_SC) - 1;
   } else {
	   current_SC->SCp.ptr              = NULL;
	   current_SC->SCp.this_residual    = 0;
	   current_SC->SCp.buffer           = NULL;
	   current_SC->SCp.buffers_residual = 0;
   }

   current_SC->SCp.Status              = 0;
   current_SC->SCp.Message             = 0;
   current_SC->SCp.have_data_in        = 0;
   current_SC->SCp.sent_command        = 0;
   current_SC->SCp.phase               = in_arbitration;

   /* Start arbitration */
   outb(0x00, port_base + Interrupt_Cntl);
   outb(0x00, port_base + SCSI_Cntl);              /* Disable data drivers */
   outb(adapter_mask, port_base + SCSI_Data_NoACK); /* Set our id bit */
   ++in_command;
   outb(0x20, port_base + Interrupt_Cntl);
   outb(0x14 | PARITY_MASK, port_base + TMC_Cntl); /* Start arbitration */

   return 0;
}

static DEF_SCSI_QCMD(fdomain_16x0_queue)

#if DEBUG_ABORT
static void print_info(struct scsi_cmnd *SCpnt)
{
   unsigned int imr;
   unsigned int irr;
   unsigned int isr;

   if (!SCpnt || !SCpnt->device || !SCpnt->device->host) {
      printk(KERN_WARNING "scsi: <fdomain> Cannot provide detailed information\n");
      return;
   }
   
   printk(KERN_INFO "%s\n", fdomain_16x0_info( SCpnt->device->host ) );
   print_banner(SCpnt->device->host);
   switch (SCpnt->SCp.phase) {
   case in_arbitration: printk("arbitration"); break;
   case in_selection:   printk("selection");   break;
   case in_other:       printk("other");       break;
   default:             printk("unknown");     break;
   }

   printk( " (%d), target = %d cmnd = 0x%02x pieces = %d size = %u\n",
	   SCpnt->SCp.phase,
	   SCpnt->device->id,
	   *(unsigned char *)SCpnt->cmnd,
	   scsi_sg_count(SCpnt),
	   scsi_bufflen(SCpnt));
   printk( "sent_command = %d, have_data_in = %d, timeout = %d\n",
	   SCpnt->SCp.sent_command,
	   SCpnt->SCp.have_data_in,
	   SCpnt->timeout );
#if DEBUG_RACE
   printk( "in_interrupt_flag = %d\n", in_interrupt_flag );
#endif

   imr = (inb( 0x0a1 ) << 8) + inb( 0x21 );
   outb( 0x0a, 0xa0 );
   irr = inb( 0xa0 ) << 8;
   outb( 0x0a, 0x20 );
   irr += inb( 0x20 );
   outb( 0x0b, 0xa0 );
   isr = inb( 0xa0 ) << 8;
   outb( 0x0b, 0x20 );
   isr += inb( 0x20 );

				/* Print out interesting information */
   printk( "IMR = 0x%04x", imr );
   if (imr & (1 << interrupt_level))
	 printk( " (masked)" );
   printk( ", IRR = 0x%04x, ISR = 0x%04x\n", irr, isr );

   printk( "SCSI Status      = 0x%02x\n", inb(port_base + SCSI_Status));
   printk( "TMC Status       = 0x%02x", inb(port_base + TMC_Status));
   if (inb((port_base + TMC_Status) & 1))
	 printk( " (interrupt)" );
   printk( "\n" );
   printk("Interrupt Status = 0x%02x", inb(port_base + Interrupt_Status));
   if (inb(port_base + Interrupt_Status) & 0x08)
	 printk( " (enabled)" );
   printk( "\n" );
   if (chip == tmc18c50 || chip == tmc18c30) {
      printk("FIFO Status      = 0x%02x\n", inb(port_base + FIFO_Status));
      printk( "Int. Condition   = 0x%02x\n",
	      inb( port_base + Interrupt_Cond ) );
   }
   printk( "Configuration 1  = 0x%02x\n", inb( port_base + Configuration1 ) );
   if (chip == tmc18c50 || chip == tmc18c30)
	 printk( "Configuration 2  = 0x%02x\n",
		 inb( port_base + Configuration2 ) );
}
#endif

static int fdomain_16x0_abort(struct scsi_cmnd *SCpnt)
{
#if EVERY_ACCESS || ERRORS_ONLY || DEBUG_ABORT
   printk( "scsi: <fdomain> abort " );
#endif

   if (!in_command) {
#if EVERY_ACCESS || ERRORS_ONLY
      printk( " (not in command)\n" );
#endif
      return FAILED;
   } else printk( "\n" );

#if DEBUG_ABORT
   print_info( SCpnt );
#endif

   fdomain_make_bus_idle();
   current_SC->SCp.phase |= aborted;
   current_SC->result = DID_ABORT << 16;
   
   /* Aborts are not done well. . . */
   my_done(DID_ABORT << 16);
   return SUCCESS;
}

int fdomain_16x0_bus_reset(struct scsi_cmnd *SCpnt)
{
   unsigned long flags;

   local_irq_save(flags);

   outb(1, port_base + SCSI_Cntl);
   do_pause( 2 );
   outb(0, port_base + SCSI_Cntl);
   do_pause( 115 );
   outb(0, port_base + SCSI_Mode_Cntl);
   outb(PARITY_MASK, port_base + TMC_Cntl);

   local_irq_restore(flags);
   return SUCCESS;
}

static int fdomain_16x0_biosparam(struct scsi_device *sdev,
		struct block_device *bdev,
		sector_t capacity, int *info_array)
{
   int              drive;
   int		    size      = capacity;
   unsigned long    offset;
   struct drive_info {
      unsigned short cylinders;
      unsigned char  heads;
      unsigned char  sectors;
   } i;
   
   /* NOTES:
      The RAM area starts at 0x1f00 from the bios_base address.

      For BIOS Version 2.0:
      
      The drive parameter table seems to start at 0x1f30.
      The first byte's purpose is not known.
      Next is the cylinder, head, and sector information.
      The last 4 bytes appear to be the drive's size in sectors.
      The other bytes in the drive parameter table are unknown.
      If anyone figures them out, please send me mail, and I will
      update these notes.

      Tape drives do not get placed in this table.

      There is another table at 0x1fea:
      If the byte is 0x01, then the SCSI ID is not in use.
      If the byte is 0x18 or 0x48, then the SCSI ID is in use,
      although tapes don't seem to be in this table.  I haven't
      seen any other numbers (in a limited sample).

      0x1f2d is a drive count (i.e., not including tapes)

      The table at 0x1fcc are I/O ports addresses for the various
      operations.  I calculate these by hand in this driver code.

      
      
      For the ISA-200S version of BIOS Version 2.0:

      The drive parameter table starts at 0x1f33.

      WARNING: Assume that the table entry is 25 bytes long.  Someone needs
      to check this for the Quantum ISA-200S card.

      
      
      For BIOS Version 3.2:

      The drive parameter table starts at 0x1f70.  Each entry is
      0x0a bytes long.  Heads are one less than we need to report.
    */

   if (MAJOR(bdev->bd_dev) != SCSI_DISK0_MAJOR) {
      printk("scsi: <fdomain> fdomain_16x0_biosparam: too many disks");
      return 0;
   }
   drive = MINOR(bdev->bd_dev) >> 4;

   if (bios_major == 2) {
      switch (Quantum) {
      case 2:			/* ISA_200S */
				/* The value of 25 has never been verified.
				   It should probably be 15. */
	 offset = 0x1f33 + drive * 25;
	 break;
      case 3:			/* ISA_250MG */
	 offset = 0x1f36 + drive * 15;
	 break;
      case 4:			/* ISA_200S (another one) */
	 offset = 0x1f34 + drive * 15;
	 break;
      default:
	 offset = 0x1f31 + drive * 25;
	 break;
      }
      memcpy_fromio( &i, bios_mem + offset, sizeof( struct drive_info ) );
      info_array[0] = i.heads;
      info_array[1] = i.sectors;
      info_array[2] = i.cylinders;
   } else if (bios_major == 3
	      && bios_minor >= 0
	      && bios_minor < 4) { /* 3.0 and 3.2 BIOS */
      memcpy_fromio( &i, bios_mem + 0x1f71 + drive * 10,
		     sizeof( struct drive_info ) );
      info_array[0] = i.heads + 1;
      info_array[1] = i.sectors;
      info_array[2] = i.cylinders;
   } else {			/* 3.4 BIOS (and up?) */
      /* This algorithm was provided by Future Domain (much thanks!). */
      unsigned char *p = scsi_bios_ptable(bdev);

      if (p && p[65] == 0xaa && p[64] == 0x55 /* Partition table valid */
	  && p[4]) {			    /* Partition type */

	 /* The partition table layout is as follows:

	    Start: 0x1b3h
	    Offset: 0 = partition status
		    1 = starting head
		    2 = starting sector and cylinder (word, encoded)
		    4 = partition type
		    5 = ending head
		    6 = ending sector and cylinder (word, encoded)
		    8 = starting absolute sector (double word)
		    c = number of sectors (double word)
	    Signature: 0x1fe = 0x55aa

	    So, this algorithm assumes:
	    1) the first partition table is in use,
	    2) the data in the first entry is correct, and
	    3) partitions never divide cylinders

	    Note that (1) may be FALSE for NetBSD (and other BSD flavors),
	    as well as for Linux.  Note also, that Linux doesn't pay any
	    attention to the fields that are used by this algorithm -- it
	    only uses the absolute sector data.  Recent versions of Linux's
	    fdisk(1) will fill this data in correctly, and forthcoming
	    versions will check for consistency.

	    Checking for a non-zero partition type is not part of the
	    Future Domain algorithm, but it seemed to be a reasonable thing
	    to do, especially in the Linux and BSD worlds. */

	 info_array[0] = p[5] + 1;	    /* heads */
	 info_array[1] = p[6] & 0x3f;	    /* sectors */
      } else {

 	 /* Note that this new method guarantees that there will always be
	    less than 1024 cylinders on a platter.  This is good for drives
	    up to approximately 7.85GB (where 1GB = 1024 * 1024 kB). */

	 if ((unsigned int)size >= 0x7e0000U) {
	    info_array[0] = 0xff; /* heads   = 255 */
	    info_array[1] = 0x3f; /* sectors =  63 */
	 } else if ((unsigned int)size >= 0x200000U) {
	    info_array[0] = 0x80; /* heads   = 128 */
	    info_array[1] = 0x3f; /* sectors =  63 */
	 } else {
	    info_array[0] = 0x40; /* heads   =  64 */
	    info_array[1] = 0x20; /* sectors =  32 */
	 }
      }
				/* For both methods, compute the cylinders */
      info_array[2] = (unsigned int)size / (info_array[0] * info_array[1] );
      kfree(p);
   }
   
   return 0;
}

static int fdomain_16x0_release(struct Scsi_Host *shpnt)
{
	if (shpnt->irq)
		free_irq(shpnt->irq, shpnt);
	if (shpnt->io_port && shpnt->n_io_port)
		release_region(shpnt->io_port, shpnt->n_io_port);
	if (PCI_bus)
		pci_dev_put(PCI_dev);
	return 0;
}

struct scsi_host_template fdomain_driver_template = {
	.module			= THIS_MODULE,
	.name			= "fdomain",
	.proc_name		= "fdomain",
	.detect			= fdomain_16x0_detect,
	.info			= fdomain_16x0_info,
	.queuecommand		= fdomain_16x0_queue,
	.eh_abort_handler	= fdomain_16x0_abort,
	.eh_bus_reset_handler	= fdomain_16x0_bus_reset,
	.bios_param		= fdomain_16x0_biosparam,
	.release		= fdomain_16x0_release,
	.can_queue		= 1,
	.this_id		= 6,
	.sg_tablesize		= 64,
	.cmd_per_lun		= 1,
	.use_clustering		= DISABLE_CLUSTERING,
};

#ifndef PCMCIA
#ifdef CONFIG_PCI

static struct pci_device_id fdomain_pci_tbl[] = {
	{ PCI_VENDOR_ID_FD, PCI_DEVICE_ID_FD_36C70,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
	{ }
};
MODULE_DEVICE_TABLE(pci, fdomain_pci_tbl);
#endif
#define driver_template fdomain_driver_template
#include "scsi_module.c"

#endif