aboutsummaryrefslogtreecommitdiff
path: root/drivers/scsi/ibmmca.c
blob: 05ecc911e94ce5236725098bcdbb8645aa9676be (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
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
/*
 Low Level Linux Driver for the IBM Microchannel SCSI Subsystem for
 Linux Kernel >= 2.4.0.
 Copyright (c) 1995 Strom Systems, Inc. under the terms of the GNU
 General Public License. Written by Martin Kolinek, December 1995.
 Further development by: Chris Beauregard, Klaus Kudielka, Michael Lang
 See the file Documentation/scsi/ibmmca.txt for a detailed description
 of this driver, the commandline arguments and the history of its
 development.
 See the WWW-page: http://www.uni-mainz.de/~langm000/linux.html for latest
 updates, info and ADF-files for adapters supported by this driver.

 Alan Cox <alan@redhat.com>
 Updated for Linux 2.5.45 to use the new error handler, cleaned up the
 lock macros and did a few unavoidable locking tweaks, plus one locking
 fix in the irq and completion path.
 
 */

#include <linux/config.h>
#ifndef LINUX_VERSION_CODE
#include <linux/version.h>
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,45)
#error "This driver works only with kernel 2.5.45 or higher!"
#endif
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/mca.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/mca-legacy.h>

#include <asm/system.h>
#include <asm/io.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "ibmmca.h"

/* current version of this driver-source: */
#define IBMMCA_SCSI_DRIVER_VERSION "4.0b-ac"

/* driver configuration */
#define IM_MAX_HOSTS     8	/* maximum number of host adapters */
#define IM_RESET_DELAY	60	/* seconds allowed for a reset */

/* driver debugging - #undef all for normal operation */
/* if defined: count interrupts and ignore this special one: */
#undef	IM_DEBUG_TIMEOUT	//50
#define TIMEOUT_PUN	0
#define TIMEOUT_LUN	0
/* verbose interrupt: */
#undef IM_DEBUG_INT
/* verbose queuecommand: */
#undef IM_DEBUG_CMD
/* verbose queucommand for specific SCSI-device type: */
#undef IM_DEBUG_CMD_SPEC_DEV
/* verbose device probing */
#undef IM_DEBUG_PROBE

/* device type that shall be displayed on syslog (only during debugging): */
#define IM_DEBUG_CMD_DEVICE	TYPE_TAPE

/* relative addresses of hardware registers on a subsystem */
#define IM_CMD_REG(hi)	(hosts[(hi)]->io_port)	/*Command Interface, (4 bytes long) */
#define IM_ATTN_REG(hi)	(hosts[(hi)]->io_port+4)	/*Attention (1 byte) */
#define IM_CTR_REG(hi)	(hosts[(hi)]->io_port+5)	/*Basic Control (1 byte) */
#define IM_INTR_REG(hi)	(hosts[(hi)]->io_port+6)	/*Interrupt Status (1 byte, r/o) */
#define IM_STAT_REG(hi)	(hosts[(hi)]->io_port+7)	/*Basic Status (1 byte, read only) */

/* basic I/O-port of first adapter */
#define IM_IO_PORT	0x3540
/* maximum number of hosts that can be found */
#define IM_N_IO_PORT	8

/*requests going into the upper nibble of the Attention register */
/*note: the lower nibble specifies the device(0-14), or subsystem(15) */
#define IM_IMM_CMD	0x10	/*immediate command */
#define IM_SCB		0x30	/*Subsystem Control Block command */
#define IM_LONG_SCB	0x40	/*long Subsystem Control Block command */
#define IM_EOI		0xe0	/*end-of-interrupt request */

/*values for bits 7,1,0 of Basic Control reg. (bits 6-2 reserved) */
#define IM_HW_RESET	0x80	/*hardware reset */
#define IM_ENABLE_DMA	0x02	/*enable subsystem's busmaster DMA */
#define IM_ENABLE_INTR	0x01	/*enable interrupts to the system */

/*to interpret the upper nibble of Interrupt Status register */
/*note: the lower nibble specifies the device(0-14), or subsystem(15) */
#define IM_SCB_CMD_COMPLETED			0x10
#define IM_SCB_CMD_COMPLETED_WITH_RETRIES	0x50
#define IM_LOOP_SCATTER_BUFFER_FULL		0x60
#define IM_ADAPTER_HW_FAILURE			0x70
#define IM_IMMEDIATE_CMD_COMPLETED		0xa0
#define IM_CMD_COMPLETED_WITH_FAILURE		0xc0
#define IM_CMD_ERROR				0xe0
#define IM_SOFTWARE_SEQUENCING_ERROR		0xf0

/*to interpret bits 3-0 of Basic Status register (bits 7-4 reserved) */
#define IM_CMD_REG_FULL		0x08
#define IM_CMD_REG_EMPTY	0x04
#define IM_INTR_REQUEST		0x02
#define IM_BUSY			0x01

/*immediate commands (word written into low 2 bytes of command reg) */
#define IM_RESET_IMM_CMD	0x0400
#define IM_FEATURE_CTR_IMM_CMD	0x040c
#define IM_DMA_PACING_IMM_CMD	0x040d
#define IM_ASSIGN_IMM_CMD	0x040e
#define IM_ABORT_IMM_CMD	0x040f
#define IM_FORMAT_PREP_IMM_CMD	0x0417

/*SCB (Subsystem Control Block) structure */
struct im_scb {
	unsigned short command;	/*command word (read, etc.) */
	unsigned short enable;	/*enable word, modifies cmd */
	union {
		unsigned long log_blk_adr;	/*block address on SCSI device */
		unsigned char scsi_cmd_length;	/*6,10,12, for other scsi cmd */
	} u1;
	unsigned long sys_buf_adr;	/*physical system memory adr */
	unsigned long sys_buf_length;	/*size of sys mem buffer */
	unsigned long tsb_adr;	/*Termination Status Block adr */
	unsigned long scb_chain_adr;	/*optional SCB chain address */
	union {
		struct {
			unsigned short count;	/*block count, on SCSI device */
			unsigned short length;	/*block length, on SCSI device */
		} blk;
		unsigned char scsi_command[12];	/*other scsi command */
	} u2;
};

/*structure scatter-gather element (for list of system memory areas) */
struct im_sge {
	void *address;
	unsigned long byte_length;
};

/*structure returned by a get_pos_info command: */
struct im_pos_info {
	unsigned short pos_id;	/* adapter id */
	unsigned char pos_3a;	/* pos 3 (if pos 6 = 0) */
	unsigned char pos_2;	/* pos 2 */
	unsigned char int_level;	/* interrupt level IRQ 11 or 14 */
	unsigned char pos_4a;	/* pos 4 (if pos 6 = 0) */
	unsigned short connector_size;	/* MCA connector size: 16 or 32 Bit */
	unsigned char num_luns;	/* number of supported luns per device */
	unsigned char num_puns;	/* number of supported puns */
	unsigned char pacing_factor;	/* pacing factor */
	unsigned char num_ldns;	/* number of ldns available */
	unsigned char eoi_off;	/* time EOI and interrupt inactive */
	unsigned char max_busy;	/* time between reset and busy on */
	unsigned short cache_stat;	/* ldn cachestat. Bit=1 = not cached */
	unsigned short retry_stat;	/* retry status of ldns. Bit=1=disabled */
	unsigned char pos_4b;	/* pos 4 (if pos 6 = 1) */
	unsigned char pos_3b;	/* pos 3 (if pos 6 = 1) */
	unsigned char pos_6;	/* pos 6 */
	unsigned char pos_5;	/* pos 5 */
	unsigned short max_overlap;	/* maximum overlapping requests */
	unsigned short num_bus;	/* number of SCSI-busses */
};

/*values for SCB command word */
#define IM_NO_SYNCHRONOUS      0x0040	/*flag for any command */
#define IM_NO_DISCONNECT       0x0080	/*flag for any command */
#define IM_READ_DATA_CMD       0x1c01
#define IM_WRITE_DATA_CMD      0x1c02
#define IM_READ_VERIFY_CMD     0x1c03
#define IM_WRITE_VERIFY_CMD    0x1c04
#define IM_REQUEST_SENSE_CMD   0x1c08
#define IM_READ_CAPACITY_CMD   0x1c09
#define IM_DEVICE_INQUIRY_CMD  0x1c0b
#define IM_READ_LOGICAL_CMD    0x1c2a
#define IM_OTHER_SCSI_CMD_CMD  0x241f

/* unused, but supported, SCB commands */
#define IM_GET_COMMAND_COMPLETE_STATUS_CMD   0x1c07	/* command status */
#define IM_GET_POS_INFO_CMD                  0x1c0a	/* returns neat stuff */
#define IM_READ_PREFETCH_CMD                 0x1c31	/* caching controller only */
#define IM_FOMAT_UNIT_CMD                    0x1c16	/* format unit */
#define IM_REASSIGN_BLOCK_CMD                0x1c18	/* in case of error */

/*values to set bits in the enable word of SCB */
#define IM_READ_CONTROL              0x8000
#define IM_REPORT_TSB_ONLY_ON_ERROR  0x4000
#define IM_RETRY_ENABLE              0x2000
#define IM_POINTER_TO_LIST           0x1000
#define IM_SUPRESS_EXCEPTION_SHORT   0x0400
#define IM_BYPASS_BUFFER             0x0200
#define IM_CHAIN_ON_NO_ERROR         0x0001

/*TSB (Termination Status Block) structure */
struct im_tsb {
	unsigned short end_status;
	unsigned short reserved1;
	unsigned long residual_byte_count;
	unsigned long sg_list_element_adr;
	unsigned short status_length;
	unsigned char dev_status;
	unsigned char cmd_status;
	unsigned char dev_error;
	unsigned char cmd_error;
	unsigned short reserved2;
	unsigned short reserved3;
	unsigned short low_of_last_scb_adr;
	unsigned short high_of_last_scb_adr;
};

/*subsystem uses interrupt request level 14 */
#define IM_IRQ     14
/*SCSI-2 F/W may evade to interrupt 11 */
#define IM_IRQ_FW  11

/* Model 95 has an additional alphanumeric display, which can be used
   to display SCSI-activities. 8595 models do not have any disk led, which
   makes this feature quite useful.
   The regular PS/2 disk led is turned on/off by bits 6,7 of system
   control port. */

/* LED display-port (actually, last LED on display) */
#define MOD95_LED_PORT	   0x108
/* system-control-register of PS/2s with diskindicator */
#define PS2_SYS_CTR        0x92
/* activity displaying methods */
#define LED_DISP           1
#define LED_ADISP          2
#define LED_ACTIVITY       4
/* failed intr */
#define CMD_FAIL           255

/* The SCSI-ID(!) of the accessed SCSI-device is shown on PS/2-95 machines' LED
   displays. ldn is no longer displayed here, because the ldn mapping is now 
   done dynamically and the ldn <-> pun,lun maps can be looked-up at boottime 
   or during uptime in /proc/scsi/ibmmca/<host_no> in case of trouble, 
   interest, debugging or just for having fun. The left number gives the
   host-adapter number and the right shows the accessed SCSI-ID. */

/* display_mode is set by the ibmmcascsi= command line arg */
static int display_mode = 0;
/* set default adapter timeout */
static unsigned int adapter_timeout = 45;
/* for probing on feature-command: */
static unsigned int global_command_error_excuse = 0;
/* global setting by command line for adapter_speed */
static int global_adapter_speed = 0;	/* full speed by default */

/* Panel / LED on, do it right for F/W addressin, too. adisplay will
 * just ignore ids>7, as the panel has only 7 digits available */
#define PS2_DISK_LED_ON(ad,id) { if (display_mode & LED_DISP) { if (id>9) \
    outw((ad+48)|((id+55)<<8), MOD95_LED_PORT ); else \
    outw((ad+48)|((id+48)<<8), MOD95_LED_PORT ); } else \
    if (display_mode & LED_ADISP) { if (id<7) outb((char)(id+48),MOD95_LED_PORT+1+id); \
    outb((char)(ad+48), MOD95_LED_PORT); } \
    if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
    outb(inb(PS2_SYS_CTR) | 0xc0, PS2_SYS_CTR); }

/* Panel / LED off */
/* bug fixed, Dec 15, 1997, where | was replaced by & here */
#define PS2_DISK_LED_OFF() { if (display_mode & LED_DISP) \
    outw(0x2020, MOD95_LED_PORT ); else if (display_mode & LED_ADISP) { \
    outl(0x20202020,MOD95_LED_PORT); outl(0x20202020,MOD95_LED_PORT+4); } \
    if ((display_mode & LED_ACTIVITY)||(!display_mode)) \
    outb(inb(PS2_SYS_CTR) & 0x3f, PS2_SYS_CTR); }

/*list of supported subsystems */
struct subsys_list_struct {
	unsigned short mca_id;
	char *description;
};

/* types of different supported hardware that goes to hostdata special */
#define IBM_SCSI2_FW     0
#define IBM_7568_WCACHE  1
#define IBM_EXP_UNIT     2
#define IBM_SCSI_WCACHE  3
#define IBM_SCSI         4

/* other special flags for hostdata structure */
#define FORCED_DETECTION         100
#define INTEGRATED_SCSI          101

/* List of possible IBM-SCSI-adapters */
static struct subsys_list_struct subsys_list[] = {
	{0x8efc, "IBM SCSI-2 F/W Adapter"},	/* special = 0 */
	{0x8efd, "IBM 7568 Industrial Computer SCSI Adapter w/Cache"},	/* special = 1 */
	{0x8ef8, "IBM Expansion Unit SCSI Controller"},	/* special = 2 */
	{0x8eff, "IBM SCSI Adapter w/Cache"},	/* special = 3 */
	{0x8efe, "IBM SCSI Adapter"},	/* special = 4 */
};

/* Max number of logical devices (can be up from 0 to 14).  15 is the address
of the adapter itself. */
#define MAX_LOG_DEV  15

/*local data for a logical device */
struct logical_device {
	struct im_scb scb;	/* SCSI-subsystem-control-block structure */
	struct im_tsb tsb;	/* SCSI command complete status block structure */
	struct im_sge sge[16];	/* scatter gather list structure */
	unsigned char buf[256];	/* SCSI command return data buffer */
	Scsi_Cmnd *cmd;		/* SCSI-command that is currently in progress */
	int device_type;	/* type of the SCSI-device. See include/scsi/scsi.h
				   for interpretation of the possible values */
	int block_length;	/* blocksize of a particular logical SCSI-device */
	int cache_flag;		/* 1 if this is uncached, 0 if cache is present for ldn */
	int retry_flag;		/* 1 if adapter retry is disabled, 0 if enabled */
};

/* statistics of the driver during operations (for proc_info) */
struct Driver_Statistics {
	/* SCSI statistics on the adapter */
	int ldn_access[MAX_LOG_DEV + 1];	/* total accesses on a ldn */
	int ldn_read_access[MAX_LOG_DEV + 1];	/* total read-access on a ldn */
	int ldn_write_access[MAX_LOG_DEV + 1];	/* total write-access on a ldn */
	int ldn_inquiry_access[MAX_LOG_DEV + 1];	/* total inquiries on a ldn */
	int ldn_modeselect_access[MAX_LOG_DEV + 1];	/* total mode selects on ldn */
	int scbs;		/* short SCBs queued */
	int long_scbs;		/* long SCBs queued */
	int total_accesses;	/* total accesses on all ldns */
	int total_interrupts;	/* total interrupts (should be
				   same as total_accesses) */
	int total_errors;	/* command completed with error */
	/* dynamical assignment statistics */
	int total_scsi_devices;	/* number of physical pun,lun */
	int dyn_flag;		/* flag showing dynamical mode */
	int dynamical_assignments;	/* number of remappings of ldns */
	int ldn_assignments[MAX_LOG_DEV + 1];	/* number of remappings of each
						   ldn */
};

/* data structure for each host adapter */
struct ibmmca_hostdata {
	/* array of logical devices: */
	struct logical_device _ld[MAX_LOG_DEV + 1];
	/* array to convert (pun, lun) into logical device number: */
	unsigned char _get_ldn[16][8];
	/*array that contains the information about the physical SCSI-devices
	   attached to this host adapter: */
	unsigned char _get_scsi[16][8];
	/* used only when checking logical devices: */
	int _local_checking_phase_flag;
	/* report received interrupt: */
	int _got_interrupt;
	/* report termination-status of SCSI-command: */
	int _stat_result;
	/* reset status (used only when doing reset): */
	int _reset_status;
	/* code of the last SCSI command (needed for panic info): */
	int _last_scsi_command[MAX_LOG_DEV + 1];
	/* identifier of the last SCSI-command type */
	int _last_scsi_type[MAX_LOG_DEV + 1];
	/* last blockcount */
	int _last_scsi_blockcount[MAX_LOG_DEV + 1];
	/* last locgical block address */
	unsigned long _last_scsi_logical_block[MAX_LOG_DEV + 1];
	/* Counter that points on the next reassignable ldn for dynamical
	   remapping. The default value is 7, that is the first reassignable
	   number in the list at boottime: */
	int _next_ldn;
	/* Statistics-structure for this IBM-SCSI-host: */
	struct Driver_Statistics _IBM_DS;
	/* This hostadapters pos-registers pos2 until pos6 */
	unsigned int _pos[8];
	/* assign a special variable, that contains dedicated info about the
	   adaptertype */
	int _special;
	/* connector size on the MCA bus */
	int _connector_size;
	/* synchronous SCSI transfer rate bitpattern */
	int _adapter_speed;
};

/* macros to access host data structure */
#define subsystem_pun(hi) (hosts[(hi)]->this_id)
#define subsystem_maxid(hi) (hosts[(hi)]->max_id)
#define ld(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_ld)
#define get_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_ldn)
#define get_scsi(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_get_scsi)
#define local_checking_phase_flag(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_local_checking_phase_flag)
#define got_interrupt(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_got_interrupt)
#define stat_result(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_stat_result)
#define reset_status(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_reset_status)
#define last_scsi_command(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_command)
#define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
#define last_scsi_blockcount(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_blockcount)
#define last_scsi_logical_block(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_logical_block)
#define last_scsi_type(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_last_scsi_type)
#define next_ldn(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_next_ldn)
#define IBM_DS(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_IBM_DS)
#define special(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_special)
#define subsystem_connector_size(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_connector_size)
#define adapter_speed(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_adapter_speed)
#define pos2(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[2])
#define pos3(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[3])
#define pos4(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[4])
#define pos5(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[5])
#define pos6(hi) (((struct ibmmca_hostdata *) hosts[(hi)]->hostdata)->_pos[6])

/* Define a arbitrary number as subsystem-marker-type. This number is, as
   described in the ANSI-SCSI-standard, not occupied by other device-types. */
#define TYPE_IBM_SCSI_ADAPTER   0x2F

/* Define 0xFF for no device type, because this type is not defined within
   the ANSI-SCSI-standard, therefore, it can be used and should not cause any
   harm. */
#define TYPE_NO_DEVICE          0xFF

/* define medium-changer. If this is not defined previously, e.g. Linux
   2.0.x, define this type here. */
#ifndef TYPE_MEDIUM_CHANGER
#define TYPE_MEDIUM_CHANGER     0x08
#endif

/* define possible operations for the immediate_assign command */
#define SET_LDN        0
#define REMOVE_LDN     1

/* ldn which is used to probe the SCSI devices */
#define PROBE_LDN      0

/* reset status flag contents */
#define IM_RESET_NOT_IN_PROGRESS         0
#define IM_RESET_IN_PROGRESS             1
#define IM_RESET_FINISHED_OK             2
#define IM_RESET_FINISHED_FAIL           3
#define IM_RESET_NOT_IN_PROGRESS_NO_INT  4
#define IM_RESET_FINISHED_OK_NO_INT      5

/* define undefined SCSI-command */
#define NO_SCSI                  0xffff

/*-----------------------------------------------------------------------*/

/* if this is nonzero, ibmmcascsi option has been passed to the kernel */
static int io_port[IM_MAX_HOSTS] = { 0, 0, 0, 0, 0, 0, 0, 0 };
static int scsi_id[IM_MAX_HOSTS] = { 7, 7, 7, 7, 7, 7, 7, 7 };

/* fill module-parameters only, when this define is present.
   (that is kernel version 2.1.x) */
#if defined(MODULE)
static char *boot_options = NULL;
module_param(boot_options, charp, 0);
module_param_array(io_port, int, NULL, 0);
module_param_array(scsi_id, int, NULL, 0);

#if 0 /* FIXME: No longer exist? --RR */
MODULE_PARM(display, "1i");
MODULE_PARM(adisplay, "1i");
MODULE_PARM(normal, "1i");
MODULE_PARM(ansi, "1i");
#endif

MODULE_LICENSE("GPL");
#endif
/*counter of concurrent disk read/writes, to turn on/off disk led */
static int disk_rw_in_progress = 0;

/* host information */
static int found = 0;
static struct Scsi_Host *hosts[IM_MAX_HOSTS + 1] = {
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
static unsigned int pos[8];	/* whole pos register-line for diagnosis */
/* Taking into account the additions, made by ZP Gu.
 * This selects now the preset value from the configfile and
 * offers the 'normal' commandline option to be accepted */
#ifdef CONFIG_IBMMCA_SCSI_ORDER_STANDARD
static char ibm_ansi_order = 1;
#else
static char ibm_ansi_order = 0;
#endif

static void issue_cmd(int, unsigned long, unsigned char);
static void internal_done(Scsi_Cmnd * cmd);
static void check_devices(int, int);
static int immediate_assign(int, unsigned int, unsigned int, unsigned int, unsigned int);
static int immediate_feature(int, unsigned int, unsigned int);
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static int immediate_reset(int, unsigned int);
#endif
static int device_inquiry(int, int);
static int read_capacity(int, int);
static int get_pos_info(int);
static char *ti_p(int);
static char *ti_l(int);
static char *ibmrate(unsigned int, int);
static int probe_display(int);
static int probe_bus_mode(int);
static int device_exists(int, int, int *, int *);
static struct Scsi_Host *ibmmca_register(struct scsi_host_template *, int, int, int, char *);
static int option_setup(char *);
/* local functions needed for proc_info */
static int ldn_access_load(int, int);
static int ldn_access_total_read_write(int);

static irqreturn_t interrupt_handler(int irq, void *dev_id,
					struct pt_regs *regs)
{
	int host_index, ihost_index;
	unsigned int intr_reg;
	unsigned int cmd_result;
	unsigned int ldn;
	Scsi_Cmnd *cmd;
	int lastSCSI;
	struct Scsi_Host *dev = dev_id;

	spin_lock(dev->host_lock);
	    /* search for one adapter-response on shared interrupt */
	    for (host_index = 0; hosts[host_index] && !(inb(IM_STAT_REG(host_index)) & IM_INTR_REQUEST); host_index++);
	/* return if some other device on this IRQ caused the interrupt */
	if (!hosts[host_index]) {
		spin_unlock(dev->host_lock);
		return IRQ_NONE;
	}

	/* the reset-function already did all the job, even ints got
	   renabled on the subsystem, so just return */
	if ((reset_status(host_index) == IM_RESET_NOT_IN_PROGRESS_NO_INT) || (reset_status(host_index) == IM_RESET_FINISHED_OK_NO_INT)) {
		reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS;
		spin_unlock(dev->host_lock);
		return IRQ_HANDLED;
	}

	/*must wait for attention reg not busy, then send EOI to subsystem */
	while (1) {
		if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
			break;
		cpu_relax();
	}
	ihost_index = host_index;
	/*get command result and logical device */
	intr_reg = (unsigned char) (inb(IM_INTR_REG(ihost_index)));
	cmd_result = intr_reg & 0xf0;
	ldn = intr_reg & 0x0f;
	/* get the last_scsi_command here */
	lastSCSI = last_scsi_command(ihost_index)[ldn];
	outb(IM_EOI | ldn, IM_ATTN_REG(ihost_index));
	
	/*these should never happen (hw fails, or a local programming bug) */
	if (!global_command_error_excuse) {
		switch (cmd_result) {
			/* Prevent from Ooopsing on error to show the real reason */
		case IM_ADAPTER_HW_FAILURE:
		case IM_SOFTWARE_SEQUENCING_ERROR:
		case IM_CMD_ERROR:
			printk(KERN_ERR "IBM MCA SCSI: Fatal Subsystem ERROR!\n");
			printk(KERN_ERR "              Last cmd=0x%x, ena=%x, len=", lastSCSI, ld(ihost_index)[ldn].scb.enable);
			if (ld(ihost_index)[ldn].cmd)
				printk("%ld/%ld,", (long) (ld(ihost_index)[ldn].cmd->request_bufflen), (long) (ld(ihost_index)[ldn].scb.sys_buf_length));
			else
				printk("none,");
			if (ld(ihost_index)[ldn].cmd)
				printk("Blocksize=%d", ld(ihost_index)[ldn].scb.u2.blk.length);
			else
				printk("Blocksize=none");
			printk(", host=0x%x, ldn=0x%x\n", ihost_index, ldn);
			if (ld(ihost_index)[ldn].cmd) {
				printk(KERN_ERR "Blockcount=%d/%d\n", last_scsi_blockcount(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u2.blk.count);
				printk(KERN_ERR "Logical block=%lx/%lx\n", last_scsi_logical_block(ihost_index)[ldn], ld(ihost_index)[ldn].scb.u1.log_blk_adr);
			}
			printk(KERN_ERR "Reason given: %s\n", (cmd_result == IM_ADAPTER_HW_FAILURE) ? "HARDWARE FAILURE" : (cmd_result == IM_SOFTWARE_SEQUENCING_ERROR) ? "SOFTWARE SEQUENCING ERROR" : (cmd_result == IM_CMD_ERROR) ? "COMMAND ERROR" : "UNKNOWN");
			/* if errors appear, enter this section to give detailed info */
			printk(KERN_ERR "IBM MCA SCSI: Subsystem Error-Status follows:\n");
			printk(KERN_ERR "              Command Type................: %x\n", last_scsi_type(ihost_index)[ldn]);
			printk(KERN_ERR "              Attention Register..........: %x\n", inb(IM_ATTN_REG(ihost_index)));
			printk(KERN_ERR "              Basic Control Register......: %x\n", inb(IM_CTR_REG(ihost_index)));
			printk(KERN_ERR "              Interrupt Status Register...: %x\n", intr_reg);
			printk(KERN_ERR "              Basic Status Register.......: %x\n", inb(IM_STAT_REG(ihost_index)));
			if ((last_scsi_type(ihost_index)[ldn] == IM_SCB) || (last_scsi_type(ihost_index)[ldn] == IM_LONG_SCB)) {
				printk(KERN_ERR "              SCB-Command.................: %x\n", ld(ihost_index)[ldn].scb.command);
				printk(KERN_ERR "              SCB-Enable..................: %x\n", ld(ihost_index)[ldn].scb.enable);
				printk(KERN_ERR "              SCB-logical block address...: %lx\n", ld(ihost_index)[ldn].scb.u1.log_blk_adr);
				printk(KERN_ERR "              SCB-system buffer address...: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_adr);
				printk(KERN_ERR "              SCB-system buffer length....: %lx\n", ld(ihost_index)[ldn].scb.sys_buf_length);
				printk(KERN_ERR "              SCB-tsb address.............: %lx\n", ld(ihost_index)[ldn].scb.tsb_adr);
				printk(KERN_ERR "              SCB-Chain address...........: %lx\n", ld(ihost_index)[ldn].scb.scb_chain_adr);
				printk(KERN_ERR "              SCB-block count.............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.count);
				printk(KERN_ERR "              SCB-block length............: %x\n", ld(ihost_index)[ldn].scb.u2.blk.length);
			}
			printk(KERN_ERR "              Send this report to the maintainer.\n");
			panic("IBM MCA SCSI: Fatal error message from the subsystem (0x%X,0x%X)!\n", lastSCSI, cmd_result);
			break;
		}
	} else {
		/* The command error handling is made silent, but we tell the
		 * calling function, that there is a reported error from the
		 * adapter. */
		switch (cmd_result) {
		case IM_ADAPTER_HW_FAILURE:
		case IM_SOFTWARE_SEQUENCING_ERROR:
		case IM_CMD_ERROR:
			global_command_error_excuse = CMD_FAIL;
			break;
		default:
			global_command_error_excuse = 0;
			break;
		}
	}
	/* if no panic appeared, increase the interrupt-counter */
	IBM_DS(ihost_index).total_interrupts++;
	/*only for local checking phase */
	if (local_checking_phase_flag(ihost_index)) {
		stat_result(ihost_index) = cmd_result;
		got_interrupt(ihost_index) = 1;
		reset_status(ihost_index) = IM_RESET_FINISHED_OK;
		last_scsi_command(ihost_index)[ldn] = NO_SCSI;
		spin_unlock(dev->host_lock);
		return IRQ_HANDLED;
	}
	/* handling of commands coming from upper level of scsi driver */
	if (last_scsi_type(ihost_index)[ldn] == IM_IMM_CMD) {
		/* verify ldn, and may handle rare reset immediate command */
		if ((reset_status(ihost_index) == IM_RESET_IN_PROGRESS) && (last_scsi_command(ihost_index)[ldn] == IM_RESET_IMM_CMD)) {
			if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
				disk_rw_in_progress = 0;
				PS2_DISK_LED_OFF();
				reset_status(ihost_index) = IM_RESET_FINISHED_FAIL;
			} else {
				/*reset disk led counter, turn off disk led */
				disk_rw_in_progress = 0;
				PS2_DISK_LED_OFF();
				reset_status(ihost_index) = IM_RESET_FINISHED_OK;
			}
			stat_result(ihost_index) = cmd_result;
			last_scsi_command(ihost_index)[ldn] = NO_SCSI;
			last_scsi_type(ihost_index)[ldn] = 0;
			spin_unlock(dev->host_lock);
			return IRQ_HANDLED;
		} else if (last_scsi_command(ihost_index)[ldn] == IM_ABORT_IMM_CMD) {
			/* react on SCSI abort command */
#ifdef IM_DEBUG_PROBE
			printk("IBM MCA SCSI: Interrupt from SCSI-abort.\n");
#endif
			disk_rw_in_progress = 0;
			PS2_DISK_LED_OFF();
			cmd = ld(ihost_index)[ldn].cmd;
			ld(ihost_index)[ldn].cmd = NULL;
			if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE)
				cmd->result = DID_NO_CONNECT << 16;
			else
				cmd->result = DID_ABORT << 16;
			stat_result(ihost_index) = cmd_result;
			last_scsi_command(ihost_index)[ldn] = NO_SCSI;
			last_scsi_type(ihost_index)[ldn] = 0;
			if (cmd->scsi_done)
				(cmd->scsi_done) (cmd);	/* should be the internal_done */
			spin_unlock(dev->host_lock);
			return IRQ_HANDLED;
		} else {
			disk_rw_in_progress = 0;
			PS2_DISK_LED_OFF();
			reset_status(ihost_index) = IM_RESET_FINISHED_OK;
			stat_result(ihost_index) = cmd_result;
			last_scsi_command(ihost_index)[ldn] = NO_SCSI;
			spin_unlock(dev->host_lock);
			return IRQ_HANDLED;
		}
	}
	last_scsi_command(ihost_index)[ldn] = NO_SCSI;
	last_scsi_type(ihost_index)[ldn] = 0;
	cmd = ld(ihost_index)[ldn].cmd;
	ld(ihost_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_TIMEOUT
	if (cmd) {
		if ((cmd->target == TIMEOUT_PUN) && (cmd->device->lun == TIMEOUT_LUN)) {
			printk("IBM MCA SCSI: Ignoring interrupt from pun=%x, lun=%x.\n", cmd->target, cmd->device->lun);
			return IRQ_HANDLED;
		}
	}
#endif
	/*if no command structure, just return, else clear cmd */
	if (!cmd)
	{
		spin_unlock(dev->host_lock);
		return IRQ_HANDLED;
	}

#ifdef IM_DEBUG_INT
	printk("cmd=%02x ireg=%02x ds=%02x cs=%02x de=%02x ce=%02x\n", cmd->cmnd[0], intr_reg, ld(ihost_index)[ldn].tsb.dev_status, ld(ihost_index)[ldn].tsb.cmd_status, ld(ihost_index)[ldn].tsb.dev_error, ld(ihost_index)[ldn].tsb.cmd_error);
#endif
	/*if this is end of media read/write, may turn off PS/2 disk led */
	if ((ld(ihost_index)[ldn].device_type != TYPE_NO_LUN) && (ld(ihost_index)[ldn].device_type != TYPE_NO_DEVICE)) {
		/* only access this, if there was a valid device addressed */
		if (--disk_rw_in_progress == 0)
			PS2_DISK_LED_OFF();
	}

	/* IBM describes the status-mask to be 0x1e, but this is not conform
	 * with SCSI-definition, I suppose, the reason for it is that IBM
	 * adapters do not support CMD_TERMINATED, TASK_SET_FULL and
	 * ACA_ACTIVE as returning statusbyte information. (ML) */
	if (cmd_result == IM_CMD_COMPLETED_WITH_FAILURE) {
		cmd->result = (unsigned char) (ld(ihost_index)[ldn].tsb.dev_status & 0x1e);
		IBM_DS(ihost_index).total_errors++;
	} else
		cmd->result = 0;
	/* write device status into cmd->result, and call done function */
	if (lastSCSI == NO_SCSI) {	/* unexpected interrupt :-( */
		cmd->result |= DID_BAD_INTR << 16;
		printk("IBM MCA SCSI: WARNING - Interrupt from non-pending SCSI-command!\n");
	} else			/* things went right :-) */
		cmd->result |= DID_OK << 16;
	if (cmd->scsi_done)
		(cmd->scsi_done) (cmd);
	spin_unlock(dev->host_lock);
	return IRQ_HANDLED;
}

static void issue_cmd(int host_index, unsigned long cmd_reg, unsigned char attn_reg)
{
	unsigned long flags;
	/* must wait for attention reg not busy */
	while (1) {
		spin_lock_irqsave(hosts[host_index]->host_lock, flags);
		if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
			break;
		spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
	}
	/* write registers and enable system interrupts */
	outl(cmd_reg, IM_CMD_REG(host_index));
	outb(attn_reg, IM_ATTN_REG(host_index));
	spin_unlock_irqrestore(hosts[host_index]->host_lock, flags);
}

static void internal_done(Scsi_Cmnd * cmd)
{
	cmd->SCp.Status++;
	return;
}

/* SCSI-SCB-command for device_inquiry */
static int device_inquiry(int host_index, int ldn)
{
	int retr;
	struct im_scb *scb;
	struct im_tsb *tsb;
	unsigned char *buf;

	scb = &(ld(host_index)[ldn].scb);
	tsb = &(ld(host_index)[ldn].tsb);
	buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
	ld(host_index)[ldn].tsb.dev_status = 0;	/* prepare statusblock */
	for (retr = 0; retr < 3; retr++) {
		/* fill scb with inquiry command */
		scb->command = IM_DEVICE_INQUIRY_CMD | IM_NO_DISCONNECT;
		scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
		last_scsi_command(host_index)[ldn] = IM_DEVICE_INQUIRY_CMD;
		last_scsi_type(host_index)[ldn] = IM_SCB;
		scb->sys_buf_adr = isa_virt_to_bus(buf);
		scb->sys_buf_length = 255;	/* maximum bufferlength gives max info */
		scb->tsb_adr = isa_virt_to_bus(tsb);
		/* issue scb to passed ldn, and busy wait for interrupt */
		got_interrupt(host_index) = 0;
		issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
		while (!got_interrupt(host_index))
			barrier();

		/*if command succesful, break */
		if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
			return 1;
	}
	/*if all three retries failed, return "no device at this ldn" */
	if (retr >= 3)
		return 0;
	else
		return 1;
}

static int read_capacity(int host_index, int ldn)
{
	int retr;
	struct im_scb *scb;
	struct im_tsb *tsb;
	unsigned char *buf;

	scb = &(ld(host_index)[ldn].scb);
	tsb = &(ld(host_index)[ldn].tsb);
	buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
	ld(host_index)[ldn].tsb.dev_status = 0;
	for (retr = 0; retr < 3; retr++) {
		/*fill scb with read capacity command */
		scb->command = IM_READ_CAPACITY_CMD;
		scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_READ_CONTROL | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
		last_scsi_command(host_index)[ldn] = IM_READ_CAPACITY_CMD;
		last_scsi_type(host_index)[ldn] = IM_SCB;
		scb->sys_buf_adr = isa_virt_to_bus(buf);
		scb->sys_buf_length = 8;
		scb->tsb_adr = isa_virt_to_bus(tsb);
		/*issue scb to passed ldn, and busy wait for interrupt */
		got_interrupt(host_index) = 0;
		issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
		while (!got_interrupt(host_index))
			barrier();

		/*if got capacity, get block length and return one device found */
		if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
			return 1;
	}
	/*if all three retries failed, return "no device at this ldn" */
	if (retr >= 3)
		return 0;
	else
		return 1;
}

static int get_pos_info(int host_index)
{
	int retr;
	struct im_scb *scb;
	struct im_tsb *tsb;
	unsigned char *buf;

	scb = &(ld(host_index)[MAX_LOG_DEV].scb);
	tsb = &(ld(host_index)[MAX_LOG_DEV].tsb);
	buf = (unsigned char *) (&(ld(host_index)[MAX_LOG_DEV].buf));
	ld(host_index)[MAX_LOG_DEV].tsb.dev_status = 0;
	for (retr = 0; retr < 3; retr++) {
		/*fill scb with get_pos_info command */
		scb->command = IM_GET_POS_INFO_CMD;
		scb->enable = IM_READ_CONTROL | IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE | IM_BYPASS_BUFFER;
		last_scsi_command(host_index)[MAX_LOG_DEV] = IM_GET_POS_INFO_CMD;
		last_scsi_type(host_index)[MAX_LOG_DEV] = IM_SCB;
		scb->sys_buf_adr = isa_virt_to_bus(buf);
		if (special(host_index) == IBM_SCSI2_FW)
			scb->sys_buf_length = 256;	/* get all info from F/W adapter */
		else
			scb->sys_buf_length = 18;	/* get exactly 18 bytes for other SCSI */
		scb->tsb_adr = isa_virt_to_bus(tsb);
		/*issue scb to ldn=15, and busy wait for interrupt */
		got_interrupt(host_index) = 0;
		issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | MAX_LOG_DEV);
		
		/* FIXME: timeout */
		while (!got_interrupt(host_index))
			barrier();

		/*if got POS-stuff, get block length and return one device found */
		if ((stat_result(host_index) == IM_SCB_CMD_COMPLETED) || (stat_result(host_index) == IM_SCB_CMD_COMPLETED_WITH_RETRIES))
			return 1;
	}
	/* if all three retries failed, return "no device at this ldn" */
	if (retr >= 3)
		return 0;
	else
		return 1;
}

/* SCSI-immediate-command for assign. This functions maps/unmaps specific
 ldn-numbers on SCSI (PUN,LUN). It is needed for presetting of the
 subsystem and for dynamical remapping od ldns. */
static int immediate_assign(int host_index, unsigned int pun, unsigned int lun, unsigned int ldn, unsigned int operation)
{
	int retr;
	unsigned long imm_cmd;

	for (retr = 0; retr < 3; retr++) {
		/* select mutation level of the SCSI-adapter */
		switch (special(host_index)) {
		case IBM_SCSI2_FW:
			imm_cmd = (unsigned long) (IM_ASSIGN_IMM_CMD);
			imm_cmd |= (unsigned long) ((lun & 7) << 24);
			imm_cmd |= (unsigned long) ((operation & 1) << 23);
			imm_cmd |= (unsigned long) ((pun & 7) << 20) | ((pun & 8) << 24);
			imm_cmd |= (unsigned long) ((ldn & 15) << 16);
			break;
		default:
			imm_cmd = inl(IM_CMD_REG(host_index));
			imm_cmd &= (unsigned long) (0xF8000000);	/* keep reserved bits */
			imm_cmd |= (unsigned long) (IM_ASSIGN_IMM_CMD);
			imm_cmd |= (unsigned long) ((lun & 7) << 24);
			imm_cmd |= (unsigned long) ((operation & 1) << 23);
			imm_cmd |= (unsigned long) ((pun & 7) << 20);
			imm_cmd |= (unsigned long) ((ldn & 15) << 16);
			break;
		}
		last_scsi_command(host_index)[MAX_LOG_DEV] = IM_ASSIGN_IMM_CMD;
		last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
		got_interrupt(host_index) = 0;
		issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
		while (!got_interrupt(host_index))
			barrier();

		/*if command succesful, break */
		if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
			return 1;
	}
	if (retr >= 3)
		return 0;
	else
		return 1;
}

static int immediate_feature(int host_index, unsigned int speed, unsigned int timeout)
{
	int retr;
	unsigned long imm_cmd;

	for (retr = 0; retr < 3; retr++) {
		/* select mutation level of the SCSI-adapter */
		imm_cmd = IM_FEATURE_CTR_IMM_CMD;
		imm_cmd |= (unsigned long) ((speed & 0x7) << 29);
		imm_cmd |= (unsigned long) ((timeout & 0x1fff) << 16);
		last_scsi_command(host_index)[MAX_LOG_DEV] = IM_FEATURE_CTR_IMM_CMD;
		last_scsi_type(host_index)[MAX_LOG_DEV] = IM_IMM_CMD;
		got_interrupt(host_index) = 0;
		/* we need to run into command errors in order to probe for the
		 * right speed! */
		global_command_error_excuse = 1;
		issue_cmd(host_index, (unsigned long) (imm_cmd), IM_IMM_CMD | MAX_LOG_DEV);
		
		/* FIXME: timeout */
		while (!got_interrupt(host_index))
			barrier();
		if (global_command_error_excuse == CMD_FAIL) {
			global_command_error_excuse = 0;
			return 2;
		} else
			global_command_error_excuse = 0;
		/*if command succesful, break */
		if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
			return 1;
	}
	if (retr >= 3)
		return 0;
	else
		return 1;
}

#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
static int immediate_reset(int host_index, unsigned int ldn)
{
	int retries;
	int ticks;
	unsigned long imm_command;

	for (retries = 0; retries < 3; retries++) {
		imm_command = inl(IM_CMD_REG(host_index));
		imm_command &= (unsigned long) (0xFFFF0000);	/* keep reserved bits */
		imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
		last_scsi_command(host_index)[ldn] = IM_RESET_IMM_CMD;
		last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
		got_interrupt(host_index) = 0;
		reset_status(host_index) = IM_RESET_IN_PROGRESS;
		issue_cmd(host_index, (unsigned long) (imm_command), IM_IMM_CMD | ldn);
		ticks = IM_RESET_DELAY * HZ;
		while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks) {
			udelay((1 + 999 / HZ) * 1000);
			barrier();
		}
		/* if reset did not complete, just complain */
		if (!ticks) {
			printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
			reset_status(host_index) = IM_RESET_FINISHED_OK;
			/* did not work, finish */
			return 1;
		}
		/*if command succesful, break */
		if (stat_result(host_index) == IM_IMMEDIATE_CMD_COMPLETED)
			return 1;
	}
	if (retries >= 3)
		return 0;
	else
		return 1;
}
#endif

/* type-interpreter for physical device numbers */
static char *ti_p(int dev)
{
	switch (dev) {
	case TYPE_IBM_SCSI_ADAPTER:
		return ("A");
	case TYPE_DISK:
		return ("D");
	case TYPE_TAPE:
		return ("T");
	case TYPE_PROCESSOR:
		return ("P");
	case TYPE_WORM:
		return ("W");
	case TYPE_ROM:
		return ("R");
	case TYPE_SCANNER:
		return ("S");
	case TYPE_MOD:
		return ("M");
	case TYPE_MEDIUM_CHANGER:
		return ("C");
	case TYPE_NO_LUN:
		return ("+");	/* show NO_LUN */
	}
	return ("-");		/* TYPE_NO_DEVICE and others */
}

/* interpreter for logical device numbers (ldn) */
static char *ti_l(int val)
{
	const char hex[16] = "0123456789abcdef";
	static char answer[2];

	answer[1] = (char) (0x0);
	if (val <= MAX_LOG_DEV)
		answer[0] = hex[val];
	else
		answer[0] = '-';
	return (char *) &answer;
}

/* transfers bitpattern of the feature command to values in MHz */
static char *ibmrate(unsigned int speed, int i)
{
	switch (speed) {
	case 0:
		return i ? "5.00" : "10.00";
	case 1:
		return i ? "4.00" : "8.00";
	case 2:
		return i ? "3.33" : "6.66";
	case 3:
		return i ? "2.86" : "5.00";
	case 4:
		return i ? "2.50" : "4.00";
	case 5:
		return i ? "2.22" : "3.10";
	case 6:
		return i ? "2.00" : "2.50";
	case 7:
		return i ? "1.82" : "2.00";
	}
	return "---";
}

static int probe_display(int what)
{
	static int rotator = 0;
	const char rotor[] = "|/-\\";

	if (!(display_mode & LED_DISP))
		return 0;
	if (!what) {
		outl(0x20202020, MOD95_LED_PORT);
		outl(0x20202020, MOD95_LED_PORT + 4);
	} else {
		outb('S', MOD95_LED_PORT + 7);
		outb('C', MOD95_LED_PORT + 6);
		outb('S', MOD95_LED_PORT + 5);
		outb('I', MOD95_LED_PORT + 4);
		outb('i', MOD95_LED_PORT + 3);
		outb('n', MOD95_LED_PORT + 2);
		outb('i', MOD95_LED_PORT + 1);
		outb((char) (rotor[rotator]), MOD95_LED_PORT);
		rotator++;
		if (rotator > 3)
			rotator = 0;
	}
	return 0;
}

static int probe_bus_mode(int host_index)
{
	struct im_pos_info *info;
	int num_bus = 0;
	int ldn;

	info = (struct im_pos_info *) (&(ld(host_index)[MAX_LOG_DEV].buf));
	if (get_pos_info(host_index)) {
		if (info->connector_size & 0xf000)
			subsystem_connector_size(host_index) = 16;
		else
			subsystem_connector_size(host_index) = 32;
		num_bus |= (info->pos_4b & 8) >> 3;
		for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
			if ((special(host_index) == IBM_SCSI_WCACHE) || (special(host_index) == IBM_7568_WCACHE)) {
				if (!((info->cache_stat >> ldn) & 1))
					ld(host_index)[ldn].cache_flag = 0;
			}
			if (!((info->retry_stat >> ldn) & 1))
				ld(host_index)[ldn].retry_flag = 0;
		}
#ifdef IM_DEBUG_PROBE
		printk("IBM MCA SCSI: SCSI-Cache bits: ");
		for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
			printk("%d", ld(host_index)[ldn].cache_flag);
		}
		printk("\nIBM MCA SCSI: SCSI-Retry bits: ");
		for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
			printk("%d", ld(host_index)[ldn].retry_flag);
		}
		printk("\n");
#endif
	}
	return num_bus;
}

/* probing scsi devices */
static void check_devices(int host_index, int adaptertype)
{
	int id, lun, ldn, ticks;
	int count_devices;	/* local counter for connected device */
	int max_pun;
	int num_bus;
	int speedrun;		/* local adapter_speed check variable */

	/* assign default values to certain variables */
	ticks = 0;
	count_devices = 0;
	IBM_DS(host_index).dyn_flag = 0;	/* normally no need for dynamical ldn management */
	IBM_DS(host_index).total_errors = 0;	/* set errorcounter to 0 */
	next_ldn(host_index) = 7;	/* next ldn to be assigned is 7, because 0-6 is 'hardwired' */

	/* initialize the very important driver-informational arrays/structs */
	memset(ld(host_index), 0, sizeof(ld(host_index)));
	for (ldn = 0; ldn <= MAX_LOG_DEV; ldn++) {
		last_scsi_command(host_index)[ldn] = NO_SCSI;	/* emptify last SCSI-command storage */
		last_scsi_type(host_index)[ldn] = 0;
		ld(host_index)[ldn].cache_flag = 1;
		ld(host_index)[ldn].retry_flag = 1;
	}
	memset(get_ldn(host_index), TYPE_NO_DEVICE, sizeof(get_ldn(host_index)));	/* this is essential ! */
	memset(get_scsi(host_index), TYPE_NO_DEVICE, sizeof(get_scsi(host_index)));	/* this is essential ! */
	for (lun = 0; lun < 8; lun++) {
		/* mark the adapter at its pun on all luns */
		get_scsi(host_index)[subsystem_pun(host_index)][lun] = TYPE_IBM_SCSI_ADAPTER;
		get_ldn(host_index)[subsystem_pun(host_index)][lun] = MAX_LOG_DEV;	/* make sure, the subsystem
											   ldn is active for all
											   luns. */
	}
	probe_display(0);	/* Supercool display usage during SCSI-probing. */
	/* This makes sense, when booting without any */
	/* monitor connected on model XX95. */

	/* STEP 1: */
	adapter_speed(host_index) = global_adapter_speed;
	speedrun = adapter_speed(host_index);
	while (immediate_feature(host_index, speedrun, adapter_timeout) == 2) {
		probe_display(1);
		if (speedrun == 7)
			panic("IBM MCA SCSI: Cannot set Synchronous-Transfer-Rate!\n");
		speedrun++;
		if (speedrun > 7)
			speedrun = 7;
	}
	adapter_speed(host_index) = speedrun;
	/* Get detailed information about the current adapter, necessary for
	 * device operations: */
	num_bus = probe_bus_mode(host_index);

	/* num_bus contains only valid data for the F/W adapter! */
	if (adaptertype == IBM_SCSI2_FW) {	/* F/W SCSI adapter: */
		/* F/W adapter PUN-space extension evaluation: */
		if (num_bus) {
			printk(KERN_INFO "IBM MCA SCSI: Separate bus mode (wide-addressing enabled)\n");
			subsystem_maxid(host_index) = 16;
		} else {
			printk(KERN_INFO "IBM MCA SCSI: Combined bus mode (wide-addressing disabled)\n");
			subsystem_maxid(host_index) = 8;
		}
		printk(KERN_INFO "IBM MCA SCSI: Sync.-Rate (F/W: 20, Int.: 10, Ext.: %s) MBytes/s\n", ibmrate(speedrun, adaptertype));
	} else			/* all other IBM SCSI adapters: */
		printk(KERN_INFO "IBM MCA SCSI: Synchronous-SCSI-Transfer-Rate: %s MBytes/s\n", ibmrate(speedrun, adaptertype));

	/* assign correct PUN device space */
	max_pun = subsystem_maxid(host_index);

#ifdef IM_DEBUG_PROBE
	printk("IBM MCA SCSI: Current SCSI-host index: %d\n", host_index);
	printk("IBM MCA SCSI: Removing default logical SCSI-device mapping.");
#else
	printk(KERN_INFO "IBM MCA SCSI: Dev. Order: %s, Mapping (takes <2min): ", (ibm_ansi_order) ? "ANSI" : "New");
#endif
	for (ldn = 0; ldn < MAX_LOG_DEV; ldn++) {
		probe_display(1);
#ifdef IM_DEBUG_PROBE
		printk(".");
#endif
		immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN);	/* remove ldn (wherever) */
	}
	lun = 0;		/* default lun is 0 */
#ifndef IM_DEBUG_PROBE
	printk("cleared,");
#endif
	/* STEP 2: */
#ifdef IM_DEBUG_PROBE
	printk("\nIBM MCA SCSI: Scanning SCSI-devices.");
#endif
	for (id = 0; id < max_pun; id++)
#ifdef CONFIG_SCSI_MULTI_LUN
		for (lun = 0; lun < 8; lun++)
#endif
		{
			probe_display(1);
#ifdef IM_DEBUG_PROBE
			printk(".");
#endif
			if (id != subsystem_pun(host_index)) {
				/* if pun is not the adapter: */
				/* set ldn=0 to pun,lun */
				immediate_assign(host_index, id, lun, PROBE_LDN, SET_LDN);
				if (device_inquiry(host_index, PROBE_LDN)) {	/* probe device */
					get_scsi(host_index)[id][lun] = (unsigned char) (ld(host_index)[PROBE_LDN].buf[0]);
					/* entry, even for NO_LUN */
					if (ld(host_index)[PROBE_LDN].buf[0] != TYPE_NO_LUN)
						count_devices++;	/* a existing device is found */
				}
				/* remove ldn */
				immediate_assign(host_index, id, lun, PROBE_LDN, REMOVE_LDN);
			}
		}
#ifndef IM_DEBUG_PROBE
	printk("scanned,");
#endif
	/* STEP 3: */
#ifdef IM_DEBUG_PROBE
	printk("\nIBM MCA SCSI: Mapping SCSI-devices.");
#endif
	ldn = 0;
	lun = 0;
#ifdef CONFIG_SCSI_MULTI_LUN
	for (lun = 0; lun < 8 && ldn < MAX_LOG_DEV; lun++)
#endif
		for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
			probe_display(1);
#ifdef IM_DEBUG_PROBE
			printk(".");
#endif
			if (id != subsystem_pun(host_index)) {
				if (get_scsi(host_index)[id][lun] != TYPE_NO_LUN && get_scsi(host_index)[id][lun] != TYPE_NO_DEVICE) {
					/* Only map if accepted type. Always enter for
					   lun == 0 to get no gaps into ldn-mapping for ldn<7. */
					immediate_assign(host_index, id, lun, ldn, SET_LDN);
					get_ldn(host_index)[id][lun] = ldn;	/* map ldn */
					if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
#ifdef CONFIG_IBMMCA_SCSI_DEV_RESET
						printk("resetting device at ldn=%x ... ", ldn);
						immediate_reset(host_index, ldn);
#endif
						ldn++;
					} else {
						/* device vanished, probably because we don't know how to
						 * handle it or because it has problems */
						if (lun > 0) {
							/* remove mapping */
							get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
							immediate_assign(host_index, 0, 0, ldn, REMOVE_LDN);
						} else
							ldn++;
					}
				} else if (lun == 0) {
					/* map lun == 0, even if no device exists */
					immediate_assign(host_index, id, lun, ldn, SET_LDN);
					get_ldn(host_index)[id][lun] = ldn;	/* map ldn */
					ldn++;
				}
			}
		}
	/* STEP 4: */

	/* map remaining ldns to non-existing devices */
	for (lun = 1; lun < 8 && ldn < MAX_LOG_DEV; lun++)
		for (id = 0; id < max_pun && ldn < MAX_LOG_DEV; id++) {
			if (get_scsi(host_index)[id][lun] == TYPE_NO_LUN || get_scsi(host_index)[id][lun] == TYPE_NO_DEVICE) {
				probe_display(1);
				/* Map remaining ldns only to NON-existing pun,lun
				   combinations to make sure an inquiry will fail.
				   For MULTI_LUN, it is needed to avoid adapter autonome
				   SCSI-remapping. */
				immediate_assign(host_index, id, lun, ldn, SET_LDN);
				get_ldn(host_index)[id][lun] = ldn;
				ldn++;
			}
		}
#ifndef IM_DEBUG_PROBE
	printk("mapped.");
#endif
	printk("\n");
#ifdef IM_DEBUG_PROBE
	if (ibm_ansi_order)
		printk("IBM MCA SCSI: Device order: IBM/ANSI (pun=7 is first).\n");
	else
		printk("IBM MCA SCSI: Device order: New Industry Standard (pun=0 is first).\n");
#endif

#ifdef IM_DEBUG_PROBE
	/* Show the physical and logical mapping during boot. */
	printk("IBM MCA SCSI: Determined SCSI-device-mapping:\n");
	printk("    Physical SCSI-Device Map               Logical SCSI-Device Map\n");
	printk("ID\\LUN  0  1  2  3  4  5  6  7       ID\\LUN  0  1  2  3  4  5  6  7\n");
	for (id = 0; id < max_pun; id++) {
		printk("%2d     ", id);
		for (lun = 0; lun < 8; lun++)
			printk("%2s ", ti_p(get_scsi(host_index)[id][lun]));
		printk("      %2d     ", id);
		for (lun = 0; lun < 8; lun++)
			printk("%2s ", ti_l(get_ldn(host_index)[id][lun]));
		printk("\n");
	}
#endif

	/* assign total number of found SCSI-devices to the statistics struct */
	IBM_DS(host_index).total_scsi_devices = count_devices;

	/* decide for output in /proc-filesystem, if the configuration of
	   SCSI-devices makes dynamical reassignment of devices necessary */
	if (count_devices >= MAX_LOG_DEV)
		IBM_DS(host_index).dyn_flag = 1;	/* dynamical assignment is necessary */
	else
		IBM_DS(host_index).dyn_flag = 0;	/* dynamical assignment is not necessary */

	/* If no SCSI-devices are assigned, return 1 in order to cause message. */
	if (ldn == 0)
		printk("IBM MCA SCSI: Warning: No SCSI-devices found/assigned!\n");

	/* reset the counters for statistics on the current adapter */
	IBM_DS(host_index).scbs = 0;
	IBM_DS(host_index).long_scbs = 0;
	IBM_DS(host_index).total_accesses = 0;
	IBM_DS(host_index).total_interrupts = 0;
	IBM_DS(host_index).dynamical_assignments = 0;
	memset(IBM_DS(host_index).ldn_access, 0x0, sizeof(IBM_DS(host_index).ldn_access));
	memset(IBM_DS(host_index).ldn_read_access, 0x0, sizeof(IBM_DS(host_index).ldn_read_access));
	memset(IBM_DS(host_index).ldn_write_access, 0x0, sizeof(IBM_DS(host_index).ldn_write_access));
	memset(IBM_DS(host_index).ldn_inquiry_access, 0x0, sizeof(IBM_DS(host_index).ldn_inquiry_access));
	memset(IBM_DS(host_index).ldn_modeselect_access, 0x0, sizeof(IBM_DS(host_index).ldn_modeselect_access));
	memset(IBM_DS(host_index).ldn_assignments, 0x0, sizeof(IBM_DS(host_index).ldn_assignments));
	probe_display(0);
	return;
}

static int device_exists(int host_index, int ldn, int *block_length, int *device_type)
{
	unsigned char *buf;
	/* if no valid device found, return immediately with 0 */
	if (!(device_inquiry(host_index, ldn)))
		return 0;
	buf = (unsigned char *) (&(ld(host_index)[ldn].buf));
	if (*buf == TYPE_ROM) {
		*device_type = TYPE_ROM;
		*block_length = 2048;	/* (standard blocksize for yellow-/red-book) */
		return 1;
	}
	if (*buf == TYPE_WORM) {
		*device_type = TYPE_WORM;
		*block_length = 2048;
		return 1;
	}
	if (*buf == TYPE_DISK) {
		*device_type = TYPE_DISK;
		if (read_capacity(host_index, ldn)) {
			*block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
			return 1;
		} else
			return 0;
	}
	if (*buf == TYPE_MOD) {
		*device_type = TYPE_MOD;
		if (read_capacity(host_index, ldn)) {
			*block_length = *(buf + 7) + (*(buf + 6) << 8) + (*(buf + 5) << 16) + (*(buf + 4) << 24);
			return 1;
		} else
			return 0;
	}
	if (*buf == TYPE_TAPE) {
		*device_type = TYPE_TAPE;
		*block_length = 0;	/* not in use (setting by mt and mtst in op.) */
		return 1;
	}
	if (*buf == TYPE_PROCESSOR) {
		*device_type = TYPE_PROCESSOR;
		*block_length = 0;	/* they set their stuff on drivers */
		return 1;
	}
	if (*buf == TYPE_SCANNER) {
		*device_type = TYPE_SCANNER;
		*block_length = 0;	/* they set their stuff on drivers */
		return 1;
	}
	if (*buf == TYPE_MEDIUM_CHANGER) {
		*device_type = TYPE_MEDIUM_CHANGER;
		*block_length = 0;	/* One never knows, what to expect on a medium
					   changer device. */
		return 1;
	}
	return 0;
}

static void internal_ibmmca_scsi_setup(char *str, int *ints)
{
	int i, j, io_base, id_base;
	char *token;

	io_base = 0;
	id_base = 0;
	if (str) {
		j = 0;
		while ((token = strsep(&str, ",")) != NULL) {
			if (!strcmp(token, "activity"))
				display_mode |= LED_ACTIVITY;
			if (!strcmp(token, "display"))
				display_mode |= LED_DISP;
			if (!strcmp(token, "adisplay"))
				display_mode |= LED_ADISP;
			if (!strcmp(token, "normal"))
				ibm_ansi_order = 0;
			if (!strcmp(token, "ansi"))
				ibm_ansi_order = 1;
			if (!strcmp(token, "fast"))
				global_adapter_speed = 0;
			if (!strcmp(token, "medium"))
				global_adapter_speed = 4;
			if (!strcmp(token, "slow"))
				global_adapter_speed = 7;
			if ((*token == '-') || (isdigit(*token))) {
				if (!(j % 2) && (io_base < IM_MAX_HOSTS))
					io_port[io_base++] = simple_strtoul(token, NULL, 0);
				if ((j % 2) && (id_base < IM_MAX_HOSTS))
					scsi_id[id_base++] = simple_strtoul(token, NULL, 0);
				j++;
			}
		}
	} else if (ints) {
		for (i = 0; i < IM_MAX_HOSTS && 2 * i + 2 < ints[0]; i++) {
			io_port[i] = ints[2 * i + 2];
			scsi_id[i] = ints[2 * i + 2];
		}
	}
	return;
}

static int ibmmca_getinfo(char *buf, int slot, void *dev_id)
{
	struct Scsi_Host *shpnt;
	int len, speciale, connectore, k;
	unsigned int pos[8];
	unsigned long flags;
	struct Scsi_Host *dev = dev_id;

	spin_lock_irqsave(dev->host_lock, flags);
	
	shpnt = dev;		/* assign host-structure to local pointer */
	len = 0;		/* set filled text-buffer index to 0 */
	/* get the _special contents of the hostdata structure */
	speciale = ((struct ibmmca_hostdata *) shpnt->hostdata)->_special;
	connectore = ((struct ibmmca_hostdata *) shpnt->hostdata)->_connector_size;
	for (k = 2; k < 4; k++)
		pos[k] = ((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k];
	if (speciale == FORCED_DETECTION) {	/* forced detection */
		len += sprintf(buf + len,
			       "Adapter category: forced detected\n" "***************************************\n" "***  Forced detected SCSI Adapter   ***\n" "***  No chip-information available  ***\n" "***************************************\n");
	} else if (speciale == INTEGRATED_SCSI) {
		/* if the integrated subsystem has been found automatically: */
		len += sprintf(buf + len,
			       "Adapter category: integrated\n" "Chip revision level: %d\n" "Chip status: %s\n" "8 kByte NVRAM status: %s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 1) ? "enabled" : "disabled", (pos[2] & 2) ? "locked" : "accessible");
	} else if ((speciale >= 0) && (speciale < (sizeof(subsys_list) / sizeof(struct subsys_list_struct)))) {
		/* if the subsystem is a slot adapter */
		len += sprintf(buf + len, "Adapter category: slot-card\n" "ROM Segment Address: ");
		if ((pos[2] & 0xf0) == 0xf0)
			len += sprintf(buf + len, "off\n");
		else
			len += sprintf(buf + len, "0x%x\n", ((pos[2] & 0xf0) << 13) + 0xc0000);
		len += sprintf(buf + len, "Chip status: %s\n", (pos[2] & 1) ? "enabled" : "disabled");
		len += sprintf(buf + len, "Adapter I/O Offset: 0x%x\n", ((pos[2] & 0x0e) << 2));
	} else {
		len += sprintf(buf + len, "Adapter category: unknown\n");
	}
	/* common subsystem information to write to the slotn file */
	len += sprintf(buf + len, "Subsystem PUN: %d\n", shpnt->this_id);
	len += sprintf(buf + len, "I/O base address range: 0x%x-0x%x\n", (unsigned int) (shpnt->io_port), (unsigned int) (shpnt->io_port + 7));
	len += sprintf(buf + len, "MCA-slot size: %d bits", connectore);
	/* Now make sure, the bufferlength is devidable by 4 to avoid
	 * paging problems of the buffer. */
	while (len % sizeof(int) != (sizeof(int) - 1))
		len += sprintf(buf + len, " ");
	len += sprintf(buf + len, "\n");
	
	spin_unlock_irqrestore(shpnt->host_lock, flags);
	
	return len;
}

int ibmmca_detect(struct scsi_host_template * scsi_template)
{
	struct Scsi_Host *shpnt;
	int port, id, i, j, k, list_size, slot;
	int devices_on_irq_11 = 0;
	int devices_on_irq_14 = 0;
	int IRQ14_registered = 0;
	int IRQ11_registered = 0;

	found = 0;		/* make absolutely sure, that found is set to 0 */

	/* First of all, print the version number of the driver. This is
	 * important to allow better user bugreports in case of already
	 * having problems with the MCA_bus probing. */
	printk(KERN_INFO "IBM MCA SCSI: Version %s\n", IBMMCA_SCSI_DRIVER_VERSION);
	/* if this is not MCA machine, return "nothing found" */
	if (!MCA_bus) {
		printk(KERN_INFO "IBM MCA SCSI:  No Microchannel-bus present --> Aborting.\n" "      	     This machine does not have any IBM MCA-bus\n" "    	     or the MCA-Kernel-support is not enabled!\n");
		return 0;
	}

#ifdef MODULE
	/* If the driver is run as module, read from conf.modules or cmd-line */
	if (boot_options)
		option_setup(boot_options);
#endif

	/* get interrupt request level */
	if (request_irq(IM_IRQ, interrupt_handler, SA_SHIRQ, "ibmmcascsi", hosts)) {
		printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ);
		return 0;
	} else
		IRQ14_registered++;

	/* if ibmmcascsi setup option was passed to kernel, return "found" */
	for (i = 0; i < IM_MAX_HOSTS; i++)
		if (io_port[i] > 0 && scsi_id[i] >= 0 && scsi_id[i] < 8) {
			printk("IBM MCA SCSI: forced detected SCSI Adapter, io=0x%x, scsi id=%d.\n", io_port[i], scsi_id[i]);
			if ((shpnt = ibmmca_register(scsi_template, io_port[i], scsi_id[i], FORCED_DETECTION, "forced detected SCSI Adapter"))) {
				for (k = 2; k < 7; k++)
					((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = 0;
				((struct ibmmca_hostdata *) shpnt->hostdata)->_special = FORCED_DETECTION;
				mca_set_adapter_name(MCA_INTEGSCSI, "forced detected SCSI Adapter");
				mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
				mca_mark_as_used(MCA_INTEGSCSI);
				devices_on_irq_14++;
			}
		}
	if (found)
		return found;

	/* The POS2-register of all PS/2 model SCSI-subsystems has the following
	 * interpretation of bits:
	 *                             Bit 7 - 4 : Chip Revision ID (Release)
	 *                             Bit 3 - 2 : Reserved
	 *                             Bit 1     : 8k NVRAM Disabled
	 *                             Bit 0     : Chip Enable (EN-Signal)
	 * The POS3-register is interpreted as follows:
	 *                             Bit 7 - 5 : SCSI ID
	 *                             Bit 4     : Reserved = 0
	 *                             Bit 3 - 0 : Reserved = 0
	 * (taken from "IBM, PS/2 Hardware Interface Technical Reference, Common
	 * Interfaces (1991)").
	 * In short words, this means, that IBM PS/2 machines only support
	 * 1 single subsystem by default. The slot-adapters must have another
	 * configuration on pos2. Here, one has to assume the following
	 * things for POS2-register:
	 *                             Bit 7 - 4 : Chip Revision ID (Release)
	 *                             Bit 3 - 1 : port offset factor
	 *                             Bit 0     : Chip Enable (EN-Signal)
	 * As I found a patch here, setting the IO-registers to 0x3540 forced,
	 * as there was a 0x05 in POS2 on a model 56, I assume, that the
	 * port 0x3540 must be fix for integrated SCSI-controllers.
	 * Ok, this discovery leads to the following implementation: (M.Lang) */

	/* first look for the IBM SCSI integrated subsystem on the motherboard */
	for (j = 0; j < 8; j++)	/* read the pos-information */
		pos[j] = mca_read_stored_pos(MCA_INTEGSCSI, j);
	/* pos2 = pos3 = 0xff if there is no integrated SCSI-subsystem present, but
	 * if we ignore the settings of all surrounding pos registers, it is not
	 * completely sufficient to only check pos2 and pos3. */
	/* Therefore, now the following if statement is used to
	 * make sure, we see a real integrated onboard SCSI-interface and no
	 * internal system information, which gets mapped to some pos registers
	 * on models 95xx. */
	if ((!pos[0] && !pos[1] && pos[2] > 0 && pos[3] > 0 && !pos[4] && !pos[5] && !pos[6] && !pos[7]) || (pos[0] == 0xff && pos[1] == 0xff && pos[2] < 0xff && pos[3] < 0xff && pos[4] == 0xff && pos[5] == 0xff && pos[6] == 0xff && pos[7] == 0xff)) {
		if ((pos[2] & 1) == 1)	/* is the subsystem chip enabled ? */
			port = IM_IO_PORT;
		else {		/* if disabled, no IRQs will be generated, as the chip won't
				 * listen to the incoming commands and will do really nothing,
				 * except for listening to the pos-register settings. If this
				 * happens, I need to hugely think about it, as one has to
				 * write something to the MCA-Bus pos register in order to
				 * enable the chip. Normally, IBM-SCSI won't pass the POST,
				 * when the chip is disabled (see IBM tech. ref.). */
			port = IM_IO_PORT;	/* anyway, set the portnumber and warn */
			printk("IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n" "              SCSI-operations may not work.\n");
		}
		id = (pos[3] & 0xe0) >> 5;	/* this is correct and represents the PUN */
		/* give detailed information on the subsystem. This helps me
		 * additionally during debugging and analyzing bug-reports. */
		printk(KERN_INFO "IBM MCA SCSI: IBM Integrated SCSI Controller ffound, io=0x%x, scsi id=%d,\n", port, id);
		printk(KERN_INFO "              chip rev.=%d, 8K NVRAM=%s, subsystem=%s\n", ((pos[2] & 0xf0) >> 4), (pos[2] & 2) ? "locked" : "accessible", (pos[2] & 1) ? "enabled." : "disabled.");

		/* register the found integrated SCSI-subsystem */
		if ((shpnt = ibmmca_register(scsi_template, port, id, INTEGRATED_SCSI, "IBM Integrated SCSI Controller"))) 
		{
			for (k = 2; k < 7; k++)
				((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
			((struct ibmmca_hostdata *) shpnt->hostdata)->_special = INTEGRATED_SCSI;
			mca_set_adapter_name(MCA_INTEGSCSI, "IBM Integrated SCSI Controller");
			mca_set_adapter_procfn(MCA_INTEGSCSI, (MCA_ProcFn) ibmmca_getinfo, shpnt);
			mca_mark_as_used(MCA_INTEGSCSI);
			devices_on_irq_14++;
		}
	}

	/* now look for other adapters in MCA slots, */
	/* determine the number of known IBM-SCSI-subsystem types */
	/* see the pos[2] dependence to get the adapter port-offset. */
	list_size = sizeof(subsys_list) / sizeof(struct subsys_list_struct);
	for (i = 0; i < list_size; i++) {
		/* scan each slot for a fitting adapter id */
		slot = 0;	/* start at slot 0 */
		while ((slot = mca_find_adapter(subsys_list[i].mca_id, slot))
		       != MCA_NOTFOUND) {	/* scan through all slots */
			for (j = 0; j < 8; j++)	/* read the pos-information */
				pos[j] = mca_read_stored_pos(slot, j);
			if ((pos[2] & 1) == 1)
				/* is the subsystem chip enabled ? */
				/* (explanations see above) */
				port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
			else {
				/* anyway, set the portnumber and warn */
				port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
				printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
				printk(KERN_WARNING "              SCSI-operations may not work.\n");
			}
			if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
				printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
				printk(KERN_ERR "              Impossible to determine adapter PUN!\n");
				printk(KERN_ERR "              Guessing adapter PUN = 7.\n");
				id = 7;
			} else {
				id = (pos[3] & 0xe0) >> 5;	/* get subsystem PUN */
				if (i == IBM_SCSI2_FW) {
					id |= (pos[3] & 0x10) >> 1;	/* get subsystem PUN high-bit
									 * for F/W adapters */
				}
			}
			if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
				/* IRQ11 is used by SCSI-2 F/W Adapter/A */
				printk(KERN_DEBUG "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
				/* get interrupt request level */
				if (request_irq(IM_IRQ_FW, interrupt_handler, SA_SHIRQ, "ibmmcascsi", hosts)) {
					printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
				} else
					IRQ11_registered++;
			}
			printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
			if ((pos[2] & 0xf0) == 0xf0)
				printk(KERN_DEBUG"              ROM Addr.=off,");
			else
				printk(KERN_DEBUG "              ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
			printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");

			/* register the hostadapter */
			if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
				for (k = 2; k < 8; k++)
					((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
				((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
				mca_set_adapter_name(slot, subsys_list[i].description);
				mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
				mca_mark_as_used(slot);
				if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
					devices_on_irq_11++;
				else
					devices_on_irq_14++;
			}
			slot++;	/* advance to next slot */
		}		/* advance to next adapter id in the list of IBM-SCSI-subsystems */
	}

	/* now check for SCSI-adapters, mapped to the integrated SCSI
	 * area. E.g. a W/Cache in MCA-slot 9(!). Do the check correct here,
	 * as this is a known effect on some models 95xx. */
	list_size = sizeof(subsys_list) / sizeof(struct subsys_list_struct);
	for (i = 0; i < list_size; i++) {
		/* scan each slot for a fitting adapter id */
		slot = mca_find_adapter(subsys_list[i].mca_id, MCA_INTEGSCSI);
		if (slot != MCA_NOTFOUND) {	/* scan through all slots */
			for (j = 0; j < 8; j++)	/* read the pos-information */
				pos[j] = mca_read_stored_pos(slot, j);
			if ((pos[2] & 1) == 1) {	/* is the subsystem chip enabled ? */
				/* (explanations see above) */
				port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
			} else {	/* anyway, set the portnumber and warn */
				port = IM_IO_PORT + ((pos[2] & 0x0e) << 2);
				printk(KERN_WARNING "IBM MCA SCSI: WARNING - Your SCSI-subsystem is disabled!\n");
				printk(KERN_WARNING "              SCSI-operations may not work.\n");
			}
			if ((i == IBM_SCSI2_FW) && (pos[6] != 0)) {
				printk(KERN_ERR "IBM MCA SCSI: ERROR - Wrong POS(6)-register setting!\n");
				printk(KERN_ERR  "              Impossible to determine adapter PUN!\n");
				printk(KERN_ERR "              Guessing adapter PUN = 7.\n");
				id = 7;
			} else {
				id = (pos[3] & 0xe0) >> 5;	/* get subsystem PUN */
				if (i == IBM_SCSI2_FW)
					id |= (pos[3] & 0x10) >> 1;	/* get subsystem PUN high-bit
									 * for F/W adapters */
			}
			if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0)) {
				/* IRQ11 is used by SCSI-2 F/W Adapter/A */
				printk(KERN_DEBUG  "IBM MCA SCSI: SCSI-2 F/W adapter needs IRQ 11.\n");
				/* get interrupt request level */
				if (request_irq(IM_IRQ_FW, interrupt_handler, SA_SHIRQ, "ibmmcascsi", hosts))
					printk(KERN_ERR "IBM MCA SCSI: Unable to get shared IRQ %d.\n", IM_IRQ_FW);
				else
					IRQ11_registered++;
			}
			printk(KERN_INFO "IBM MCA SCSI: %s found in slot %d, io=0x%x, scsi id=%d,\n", subsys_list[i].description, slot + 1, port, id);
			if ((pos[2] & 0xf0) == 0xf0)
				printk(KERN_DEBUG "              ROM Addr.=off,");
			else
				printk(KERN_DEBUG "              ROM Addr.=0x%x,", ((pos[2] & 0xf0) << 13) + 0xc0000);
			printk(KERN_DEBUG " port-offset=0x%x, subsystem=%s\n", ((pos[2] & 0x0e) << 2), (pos[2] & 1) ? "enabled." : "disabled.");

			/* register the hostadapter */
			if ((shpnt = ibmmca_register(scsi_template, port, id, i, subsys_list[i].description))) {
				for (k = 2; k < 7; k++)
					((struct ibmmca_hostdata *) shpnt->hostdata)->_pos[k] = pos[k];
				((struct ibmmca_hostdata *) shpnt->hostdata)->_special = i;
				mca_set_adapter_name(slot, subsys_list[i].description);
				mca_set_adapter_procfn(slot, (MCA_ProcFn) ibmmca_getinfo, shpnt);
				mca_mark_as_used(slot);
				if ((i == IBM_SCSI2_FW) && (pos[4] & 0x01) && (pos[6] == 0))
					devices_on_irq_11++;
				else
					devices_on_irq_14++;
			}
			slot++;	/* advance to next slot */
		}		/* advance to next adapter id in the list of IBM-SCSI-subsystems */
	}
	if (IRQ11_registered && !devices_on_irq_11)
		free_irq(IM_IRQ_FW, hosts);	/* no devices on IRQ 11 */
	if (IRQ14_registered && !devices_on_irq_14)
		free_irq(IM_IRQ, hosts);	/* no devices on IRQ 14 */
	if (!devices_on_irq_11 && !devices_on_irq_14)
		printk(KERN_WARNING "IBM MCA SCSI: No IBM SCSI-subsystem adapter attached.\n");
	return found;		/* return the number of found SCSI hosts. Should be 1 or 0. */
}

static struct Scsi_Host *ibmmca_register(struct scsi_host_template * scsi_template, int port, int id, int adaptertype, char *hostname)
{
	struct Scsi_Host *shpnt;
	int i, j;
	unsigned int ctrl;

	/* check I/O region */
	if (!request_region(port, IM_N_IO_PORT, hostname)) {
		printk(KERN_ERR "IBM MCA SCSI: Unable to get I/O region 0x%x-0x%x (%d ports).\n", port, port + IM_N_IO_PORT - 1, IM_N_IO_PORT);
		return NULL;
	}

	/* register host */
	shpnt = scsi_register(scsi_template, sizeof(struct ibmmca_hostdata));
	if (!shpnt) {
		printk(KERN_ERR "IBM MCA SCSI: Unable to register host.\n");
		release_region(port, IM_N_IO_PORT);
		return NULL;
	}

	/* request I/O region */
	hosts[found] = shpnt;	/* add new found hostadapter to the list */
	special(found) = adaptertype;	/* important assignment or else crash! */
	subsystem_connector_size(found) = 0;	/* preset slot-size */
	shpnt->irq = IM_IRQ;	/* assign necessary stuff for the adapter */
	shpnt->io_port = port;
	shpnt->n_io_port = IM_N_IO_PORT;
	shpnt->this_id = id;
	shpnt->max_id = 8;	/* 8 PUNs are default */
	/* now, the SCSI-subsystem is connected to Linux */

	ctrl = (unsigned int) (inb(IM_CTR_REG(found)));	/* get control-register status */
#ifdef IM_DEBUG_PROBE
	printk("IBM MCA SCSI: Control Register contents: %x, status: %x\n", ctrl, inb(IM_STAT_REG(found)));
	printk("IBM MCA SCSI: This adapters' POS-registers: ");
	for (i = 0; i < 8; i++)
		printk("%x ", pos[i]);
	printk("\n");
#endif
	reset_status(found) = IM_RESET_NOT_IN_PROGRESS;

	for (i = 0; i < 16; i++)	/* reset the tables */
		for (j = 0; j < 8; j++)
			get_ldn(found)[i][j] = MAX_LOG_DEV;

	/* check which logical devices exist */
	/* after this line, local interrupting is possible: */
	local_checking_phase_flag(found) = 1;
	check_devices(found, adaptertype);	/* call by value, using the global variable hosts */
	local_checking_phase_flag(found) = 0;
	found++;		/* now increase index to be prepared for next found subsystem */
	/* an ibm mca subsystem has been detected */
	return shpnt;
}

static int ibmmca_release(struct Scsi_Host *shpnt)
{
	release_region(shpnt->io_port, shpnt->n_io_port);
	if (!(--found))
		free_irq(shpnt->irq, hosts);
	return 0;
}

/* The following routine is the SCSI command queue for the midlevel driver */
static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
{
	unsigned int ldn;
	unsigned int scsi_cmd;
	struct im_scb *scb;
	struct Scsi_Host *shpnt;
	int current_ldn;
	int id, lun;
	int target;
	int host_index;
	int max_pun;
	int i;
	struct scatterlist *sl;

	shpnt = cmd->device->host;
	/* search for the right hostadapter */
	for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);

	if (!hosts[host_index]) {	/* invalid hostadapter descriptor address */
		cmd->result = DID_NO_CONNECT << 16;
		if (done)
			done(cmd);
		return 0;
	}
	max_pun = subsystem_maxid(host_index);
	if (ibm_ansi_order) {
		target = max_pun - 1 - cmd->device->id;
		if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
			target--;
		else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
			target++;
	} else
		target = cmd->device->id;

	/* if (target,lun) is NO LUN or not existing at all, return error */
	if ((get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_LUN) || (get_scsi(host_index)[target][cmd->device->lun] == TYPE_NO_DEVICE)) {
		cmd->result = DID_NO_CONNECT << 16;
		if (done)
			done(cmd);
		return 0;
	}

	/*if (target,lun) unassigned, do further checks... */
	ldn = get_ldn(host_index)[target][cmd->device->lun];
	if (ldn >= MAX_LOG_DEV) {	/* on invalid ldn do special stuff */
		if (ldn > MAX_LOG_DEV) {	/* dynamical remapping if ldn unassigned */
			current_ldn = next_ldn(host_index);	/* stop-value for one circle */
			while (ld(host_index)[next_ldn(host_index)].cmd) {	/* search for a occupied, but not in */
				/* command-processing ldn. */
				next_ldn(host_index)++;
				if (next_ldn(host_index) >= MAX_LOG_DEV)
					next_ldn(host_index) = 7;
				if (current_ldn == next_ldn(host_index)) {	/* One circle done ? */
					/* no non-processing ldn found */
					scmd_printk(KERN_WARNING, cmd,
	"IBM MCA SCSI: Cannot assign SCSI-device dynamically!\n"
	"              On ldn 7-14 SCSI-commands everywhere in progress.\n"
	"              Reporting DID_NO_CONNECT for device.\n");
					cmd->result = DID_NO_CONNECT << 16;	/* return no connect */
					if (done)
						done(cmd);
					return 0;
				}
			}

			/* unmap non-processing ldn */
			for (id = 0; id < max_pun; id++)
				for (lun = 0; lun < 8; lun++) {
					if (get_ldn(host_index)[id][lun] == next_ldn(host_index)) {
						get_ldn(host_index)[id][lun] = TYPE_NO_DEVICE;
						get_scsi(host_index)[id][lun] = TYPE_NO_DEVICE;
						/* unmap entry */
					}
				}
			/* set reduced interrupt_handler-mode for checking */
			local_checking_phase_flag(host_index) = 1;
			/* map found ldn to pun,lun */
			get_ldn(host_index)[target][cmd->device->lun] = next_ldn(host_index);
			/* change ldn to the right value, that is now next_ldn */
			ldn = next_ldn(host_index);
			/* unassign all ldns (pun,lun,ldn does not matter for remove) */
			immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
			/* set only LDN for remapped device */
			immediate_assign(host_index, target, cmd->device->lun, ldn, SET_LDN);
			/* get device information for ld[ldn] */
			if (device_exists(host_index, ldn, &ld(host_index)[ldn].block_length, &ld(host_index)[ldn].device_type)) {
				ld(host_index)[ldn].cmd = NULL;	/* To prevent panic set 0, because
								   devices that were not assigned,
								   should have nothing in progress. */
				get_scsi(host_index)[target][cmd->device->lun] = ld(host_index)[ldn].device_type;
				/* increase assignment counters for statistics in /proc */
				IBM_DS(host_index).dynamical_assignments++;
				IBM_DS(host_index).ldn_assignments[ldn]++;
			} else
				/* panic here, because a device, found at boottime has
				   vanished */
				panic("IBM MCA SCSI: ldn=0x%x, SCSI-device on (%d,%d) vanished!\n", ldn, target, cmd->device->lun);
			/* unassign again all ldns (pun,lun,ldn does not matter for remove) */
			immediate_assign(host_index, 0, 0, 0, REMOVE_LDN);
			/* remap all ldns, as written in the pun/lun table */
			lun = 0;
#ifdef CONFIG_SCSI_MULTI_LUN
			for (lun = 0; lun < 8; lun++)
#endif
				for (id = 0; id < max_pun; id++) {
					if (get_ldn(host_index)[id][lun] <= MAX_LOG_DEV)
						immediate_assign(host_index, id, lun, get_ldn(host_index)[id][lun], SET_LDN);
				}
			/* set back to normal interrupt_handling */
			local_checking_phase_flag(host_index) = 0;
#ifdef IM_DEBUG_PROBE
			/* Information on syslog terminal */
			printk("IBM MCA SCSI: ldn=0x%x dynamically reassigned to (%d,%d).\n", ldn, target, cmd->device->lun);
#endif
			/* increase next_ldn for next dynamical assignment */
			next_ldn(host_index)++;
			if (next_ldn(host_index) >= MAX_LOG_DEV)
				next_ldn(host_index) = 7;
		} else {	/* wall against Linux accesses to the subsystem adapter */
			cmd->result = DID_BAD_TARGET << 16;
			if (done)
				done(cmd);
			return 0;
		}
	}

	/*verify there is no command already in progress for this log dev */
	if (ld(host_index)[ldn].cmd)
		panic("IBM MCA SCSI: cmd already in progress for this ldn.\n");

	/*save done in cmd, and save cmd for the interrupt handler */
	cmd->scsi_done = done;
	ld(host_index)[ldn].cmd = cmd;

	/*fill scb information independent of the scsi command */
	scb = &(ld(host_index)[ldn].scb);
	ld(host_index)[ldn].tsb.dev_status = 0;
	scb->enable = IM_REPORT_TSB_ONLY_ON_ERROR | IM_RETRY_ENABLE;
	scb->tsb_adr = isa_virt_to_bus(&(ld(host_index)[ldn].tsb));
	scsi_cmd = cmd->cmnd[0];

	if (cmd->use_sg) {
		i = cmd->use_sg;
		sl = (struct scatterlist *) (cmd->request_buffer);
		if (i > 16)
			panic("IBM MCA SCSI: scatter-gather list too long.\n");
		while (--i >= 0) {
			ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sl[i].page) + sl[i].offset);
			ld(host_index)[ldn].sge[i].byte_length = sl[i].length;
		}
		scb->enable |= IM_POINTER_TO_LIST;
		scb->sys_buf_adr = isa_virt_to_bus(&(ld(host_index)[ldn].sge[0]));
		scb->sys_buf_length = cmd->use_sg * sizeof(struct im_sge);
	} else {
		scb->sys_buf_adr = isa_virt_to_bus(cmd->request_buffer);
		/* recent Linux midlevel SCSI places 1024 byte for inquiry
		 * command. Far too much for old PS/2 hardware. */
		switch (scsi_cmd) {
			/* avoid command errors by setting bufferlengths to
			 * ANSI-standard. Beware of forcing it to 255,
			 * this could SEGV the kernel!!! */
		case INQUIRY:
		case REQUEST_SENSE:
		case MODE_SENSE:
		case MODE_SELECT:
			if (cmd->request_bufflen > 255)
				scb->sys_buf_length = 255;
			else
				scb->sys_buf_length = cmd->request_bufflen;
			break;
		case TEST_UNIT_READY:
			scb->sys_buf_length = 0;
			break;
		default:
			scb->sys_buf_length = cmd->request_bufflen;
			break;
		}
	}
	/*fill scb information dependent on scsi command */

#ifdef IM_DEBUG_CMD
	printk("issue scsi cmd=%02x to ldn=%d\n", scsi_cmd, ldn);
#endif

	/* for specific device-type debugging: */
#ifdef IM_DEBUG_CMD_SPEC_DEV
	if (ld(host_index)[ldn].device_type == IM_DEBUG_CMD_DEVICE)
		printk("(SCSI-device-type=0x%x) issue scsi cmd=%02x to ldn=%d\n", ld(host_index)[ldn].device_type, scsi_cmd, ldn);
#endif

	/* for possible panics store current command */
	last_scsi_command(host_index)[ldn] = scsi_cmd;
	last_scsi_type(host_index)[ldn] = IM_SCB;
	/* update statistical info */
	IBM_DS(host_index).total_accesses++;
	IBM_DS(host_index).ldn_access[ldn]++;

	switch (scsi_cmd) {
	case READ_6:
	case WRITE_6:
	case READ_10:
	case WRITE_10:
	case READ_12:
	case WRITE_12:
		/* Distinguish between disk and other devices. Only disks (that are the
		   most frequently accessed devices) should be supported by the
		   IBM-SCSI-Subsystem commands. */
		switch (ld(host_index)[ldn].device_type) {
		case TYPE_DISK:	/* for harddisks enter here ... */
		case TYPE_MOD:	/* ... try it also for MO-drives (send flames as */
			/*     you like, if this won't work.) */
			if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12) {
				/* read command preparations */
				scb->enable |= IM_READ_CONTROL;
				IBM_DS(host_index).ldn_read_access[ldn]++;	/* increase READ-access on ldn stat. */
				scb->command = IM_READ_DATA_CMD | IM_NO_DISCONNECT;
			} else {	/* write command preparations */
				IBM_DS(host_index).ldn_write_access[ldn]++;	/* increase write-count on ldn stat. */
				scb->command = IM_WRITE_DATA_CMD | IM_NO_DISCONNECT;
			}
			if (scsi_cmd == READ_6 || scsi_cmd == WRITE_6) {
				scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[3]) << 0) | (((unsigned) cmd->cmnd[2]) << 8) | ((((unsigned) cmd->cmnd[1]) & 0x1f) << 16);
				scb->u2.blk.count = (unsigned) cmd->cmnd[4];
			} else {
				scb->u1.log_blk_adr = (((unsigned) cmd->cmnd[5]) << 0) | (((unsigned) cmd->cmnd[4]) << 8) | (((unsigned) cmd->cmnd[3]) << 16) | (((unsigned) cmd->cmnd[2]) << 24);
				scb->u2.blk.count = (((unsigned) cmd->cmnd[8]) << 0) | (((unsigned) cmd->cmnd[7]) << 8);
			}
			last_scsi_logical_block(host_index)[ldn] = scb->u1.log_blk_adr;
			last_scsi_blockcount(host_index)[ldn] = scb->u2.blk.count;
			scb->u2.blk.length = ld(host_index)[ldn].block_length;
			break;
			/* for other devices, enter here. Other types are not known by
			   Linux! TYPE_NO_LUN is forbidden as valid device. */
		case TYPE_ROM:
		case TYPE_TAPE:
		case TYPE_PROCESSOR:
		case TYPE_WORM:
		case TYPE_SCANNER:
		case TYPE_MEDIUM_CHANGER:
			/* If there is a sequential-device, IBM recommends to use
			   IM_OTHER_SCSI_CMD_CMD instead of subsystem READ/WRITE.
			   This includes CD-ROM devices, too, due to the partial sequential
			   read capabilities. */
			scb->command = IM_OTHER_SCSI_CMD_CMD;
			if (scsi_cmd == READ_6 || scsi_cmd == READ_10 || scsi_cmd == READ_12)
				/* enable READ */
				scb->enable |= IM_READ_CONTROL;
			scb->enable |= IM_BYPASS_BUFFER;
			scb->u1.scsi_cmd_length = cmd->cmd_len;
			memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
			last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
			/* Read/write on this non-disk devices is also displayworthy,
			   so flash-up the LED/display. */
			break;
		}
		break;
	case INQUIRY:
		IBM_DS(host_index).ldn_inquiry_access[ldn]++;
		scb->command = IM_DEVICE_INQUIRY_CMD;
		scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
		scb->u1.log_blk_adr = 0;
		break;
	case TEST_UNIT_READY:
		scb->command = IM_OTHER_SCSI_CMD_CMD;
		scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
		scb->u1.log_blk_adr = 0;
		scb->u1.scsi_cmd_length = 6;
		memcpy(scb->u2.scsi_command, cmd->cmnd, 6);
		last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
		break;
	case READ_CAPACITY:
		/* the length of system memory buffer must be exactly 8 bytes */
		scb->command = IM_READ_CAPACITY_CMD;
		scb->enable |= IM_READ_CONTROL | IM_BYPASS_BUFFER;
		if (scb->sys_buf_length > 8)
			scb->sys_buf_length = 8;
		break;
		/* Commands that need read-only-mode (system <- device): */
	case REQUEST_SENSE:
		scb->command = IM_REQUEST_SENSE_CMD;
		scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
		break;
		/* Commands that need write-only-mode (system -> device): */
	case MODE_SELECT:
	case MODE_SELECT_10:
		IBM_DS(host_index).ldn_modeselect_access[ldn]++;
		scb->command = IM_OTHER_SCSI_CMD_CMD;
		scb->enable |= IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;	/*Select needs WRITE-enabled */
		scb->u1.scsi_cmd_length = cmd->cmd_len;
		memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
		last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
		break;
		/* For other commands, read-only is useful. Most other commands are
		   running without an input-data-block. */
	default:
		scb->command = IM_OTHER_SCSI_CMD_CMD;
		scb->enable |= IM_READ_CONTROL | IM_SUPRESS_EXCEPTION_SHORT | IM_BYPASS_BUFFER;
		scb->u1.scsi_cmd_length = cmd->cmd_len;
		memcpy(scb->u2.scsi_command, cmd->cmnd, cmd->cmd_len);
		last_scsi_type(host_index)[ldn] = IM_LONG_SCB;
		break;
	}
	/*issue scb command, and return */
	if (++disk_rw_in_progress == 1)
		PS2_DISK_LED_ON(shpnt->host_no, target);

	if (last_scsi_type(host_index)[ldn] == IM_LONG_SCB) {
		issue_cmd(host_index, isa_virt_to_bus(scb), IM_LONG_SCB | ldn);
		IBM_DS(host_index).long_scbs++;
	} else {
		issue_cmd(host_index, isa_virt_to_bus(scb), IM_SCB | ldn);
		IBM_DS(host_index).scbs++;
	}
	return 0;
}

static int __ibmmca_abort(Scsi_Cmnd * cmd)
{
	/* Abort does not work, as the adapter never generates an interrupt on
	 * whatever situation is simulated, even when really pending commands
	 * are running on the adapters' hardware ! */

	struct Scsi_Host *shpnt;
	unsigned int ldn;
	void (*saved_done) (Scsi_Cmnd *);
	int target;
	int host_index;
	int max_pun;
	unsigned long imm_command;

#ifdef IM_DEBUG_PROBE
	printk("IBM MCA SCSI: Abort subroutine called...\n");
#endif

	shpnt = cmd->device->host;
	/* search for the right hostadapter */
	for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);

	if (!hosts[host_index]) {	/* invalid hostadapter descriptor address */
		cmd->result = DID_NO_CONNECT << 16;
		if (cmd->scsi_done)
			(cmd->scsi_done) (cmd);
		shpnt = cmd->device->host;
#ifdef IM_DEBUG_PROBE
		printk(KERN_DEBUG "IBM MCA SCSI: Abort adapter selection failed!\n");
#endif
		return SUCCESS;
	}
	max_pun = subsystem_maxid(host_index);
	if (ibm_ansi_order) {
		target = max_pun - 1 - cmd->device->id;
		if ((target <= subsystem_pun(host_index)) && (cmd->device->id <= subsystem_pun(host_index)))
			target--;
		else if ((target >= subsystem_pun(host_index)) && (cmd->device->id >= subsystem_pun(host_index)))
			target++;
	} else
		target = cmd->device->id;

	/* get logical device number, and disable system interrupts */
	printk(KERN_WARNING "IBM MCA SCSI: Sending abort to device pun=%d, lun=%d.\n", target, cmd->device->lun);
	ldn = get_ldn(host_index)[target][cmd->device->lun];

	/*if cmd for this ldn has already finished, no need to abort */
	if (!ld(host_index)[ldn].cmd) {
		    return SUCCESS;
	}

	/* Clear ld.cmd, save done function, install internal done,
	 * send abort immediate command (this enables sys. interrupts),
	 * and wait until the interrupt arrives.
	 */
	saved_done = cmd->scsi_done;
	cmd->scsi_done = internal_done;
	cmd->SCp.Status = 0;
	last_scsi_command(host_index)[ldn] = IM_ABORT_IMM_CMD;
	last_scsi_type(host_index)[ldn] = IM_IMM_CMD;
	imm_command = inl(IM_CMD_REG(host_index));
	imm_command &= (unsigned long) (0xffff0000);	/* mask reserved stuff */
	imm_command |= (unsigned long) (IM_ABORT_IMM_CMD);
	/* must wait for attention reg not busy */
	/* FIXME - timeout, politeness */
	while (1) {
		if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
			break;
	}
	/* write registers and enable system interrupts */
	outl(imm_command, IM_CMD_REG(host_index));
	outb(IM_IMM_CMD | ldn, IM_ATTN_REG(host_index));
#ifdef IM_DEBUG_PROBE
	printk("IBM MCA SCSI: Abort queued to adapter...\n");
#endif
	spin_unlock_irq(shpnt->host_lock);
	while (!cmd->SCp.Status)
		yield();
	spin_lock_irq(shpnt->host_lock);
	cmd->scsi_done = saved_done;
#ifdef IM_DEBUG_PROBE
	printk("IBM MCA SCSI: Abort returned with adapter response...\n");
#endif

	/*if abort went well, call saved done, then return success or error */
	if (cmd->result == (DID_ABORT << 16)) 
	{
		cmd->result |= DID_ABORT << 16;
		if (cmd->scsi_done)
			(cmd->scsi_done) (cmd);
		ld(host_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
		printk("IBM MCA SCSI: Abort finished with success.\n");
#endif
		return SUCCESS;
	} else {
		cmd->result |= DID_NO_CONNECT << 16;
		if (cmd->scsi_done)
			(cmd->scsi_done) (cmd);
		ld(host_index)[ldn].cmd = NULL;
#ifdef IM_DEBUG_PROBE
		printk("IBM MCA SCSI: Abort failed.\n");
#endif
		return FAILED;
	}
}

static int ibmmca_abort(Scsi_Cmnd * cmd)
{
	struct Scsi_Host *shpnt = cmd->device->host;
	int rc;

	spin_lock_irq(shpnt->host_lock);
	rc = __ibmmca_abort(cmd);
	spin_unlock_irq(shpnt->host_lock);

	return rc;
}

static int __ibmmca_host_reset(Scsi_Cmnd * cmd)
{
	struct Scsi_Host *shpnt;
	Scsi_Cmnd *cmd_aid;
	int ticks, i;
	int host_index;
	unsigned long imm_command;

	if (cmd == NULL)
		BUG();

	ticks = IM_RESET_DELAY * HZ;
	shpnt = cmd->device->host;
	/* search for the right hostadapter */
	for (host_index = 0; hosts[host_index] && hosts[host_index]->host_no != shpnt->host_no; host_index++);

	if (!hosts[host_index])	/* invalid hostadapter descriptor address */
		return FAILED;

	if (local_checking_phase_flag(host_index)) {
		printk(KERN_WARNING "IBM MCA SCSI: unable to reset while checking devices.\n");
		return FAILED;
	}

	/* issue reset immediate command to subsystem, and wait for interrupt */
	printk("IBM MCA SCSI: resetting all devices.\n");
	reset_status(host_index) = IM_RESET_IN_PROGRESS;
	last_scsi_command(host_index)[0xf] = IM_RESET_IMM_CMD;
	last_scsi_type(host_index)[0xf] = IM_IMM_CMD;
	imm_command = inl(IM_CMD_REG(host_index));
	imm_command &= (unsigned long) (0xffff0000);	/* mask reserved stuff */
	imm_command |= (unsigned long) (IM_RESET_IMM_CMD);
	/* must wait for attention reg not busy */
	while (1) {
		if (!(inb(IM_STAT_REG(host_index)) & IM_BUSY))
			break;
		spin_unlock_irq(shpnt->host_lock);
		yield();
		spin_lock_irq(shpnt->host_lock);
	}
	/*write registers and enable system interrupts */
	outl(imm_command, IM_CMD_REG(host_index));
	outb(IM_IMM_CMD | 0xf, IM_ATTN_REG(host_index));
	/* wait for interrupt finished or intr_stat register to be set, as the
	 * interrupt will not be executed, while we are in here! */
	 
	/* FIXME: This is really really icky we so want a sleeping version of this ! */
	while (reset_status(host_index) == IM_RESET_IN_PROGRESS && --ticks && ((inb(IM_INTR_REG(host_index)) & 0x8f) != 0x8f)) {
		udelay((1 + 999 / HZ) * 1000);
		barrier();
	}
	/* if reset did not complete, just return an error */
	if (!ticks) {
		printk(KERN_ERR "IBM MCA SCSI: reset did not complete within %d seconds.\n", IM_RESET_DELAY);
		reset_status(host_index) = IM_RESET_FINISHED_FAIL;
		return FAILED;
	}

	if ((inb(IM_INTR_REG(host_index)) & 0x8f) == 0x8f) {
		/* analysis done by this routine and not by the intr-routine */
		if (inb(IM_INTR_REG(host_index)) == 0xaf)
			reset_status(host_index) = IM_RESET_FINISHED_OK_NO_INT;
		else if (inb(IM_INTR_REG(host_index)) == 0xcf)
			reset_status(host_index) = IM_RESET_FINISHED_FAIL;
		else		/* failed, 4get it */
			reset_status(host_index) = IM_RESET_NOT_IN_PROGRESS_NO_INT;
		outb(IM_EOI | 0xf, IM_ATTN_REG(host_index));
	}

	/* if reset failed, just return an error */
	if (reset_status(host_index) == IM_RESET_FINISHED_FAIL) {
		printk(KERN_ERR "IBM MCA SCSI: reset failed.\n");
		return FAILED;
	}

	/* so reset finished ok - call outstanding done's, and return success */
	printk(KERN_INFO "IBM MCA SCSI: Reset successfully completed.\n");
	for (i = 0; i < MAX_LOG_DEV; i++) {
		cmd_aid = ld(host_index)[i].cmd;
		if (cmd_aid && cmd_aid->scsi_done) {
			ld(host_index)[i].cmd = NULL;
			cmd_aid->result = DID_RESET << 16;
		}
	}
	return SUCCESS;
}

static int ibmmca_host_reset(Scsi_Cmnd * cmd)
{
	struct Scsi_Host *shpnt = cmd->device->host;
	int rc;

	spin_lock_irq(shpnt->host_lock);
	rc = __ibmmca_host_reset(cmd);
	spin_unlock_irq(shpnt->host_lock);

	return rc;
}

static int ibmmca_biosparam(struct scsi_device *sdev, struct block_device *bdev, sector_t capacity, int *info)
{
	int size = capacity;
	info[0] = 64;
	info[1] = 32;
	info[2] = size / (info[0] * info[1]);
	if (info[2] >= 1024) {
		info[0] = 128;
		info[1] = 63;
		info[2] = size / (info[0] * info[1]);
		if (info[2] >= 1024) {
			info[0] = 255;
			info[1] = 63;
			info[2] = size / (info[0] * info[1]);
			if (info[2] >= 1024)
				info[2] = 1023;
		}
	}
	return 0;
}

/* calculate percentage of total accesses on a ldn */
static int ldn_access_load(int host_index, int ldn)
{
	if (IBM_DS(host_index).total_accesses == 0)
		return (0);
	if (IBM_DS(host_index).ldn_access[ldn] == 0)
		return (0);
	return (IBM_DS(host_index).ldn_access[ldn] * 100) / IBM_DS(host_index).total_accesses;
}

/* calculate total amount of r/w-accesses */
static int ldn_access_total_read_write(int host_index)
{
	int a;
	int i;

	a = 0;
	for (i = 0; i <= MAX_LOG_DEV; i++)
		a += IBM_DS(host_index).ldn_read_access[i] + IBM_DS(host_index).ldn_write_access[i];
	return (a);
}

static int ldn_access_total_inquiry(int host_index)
{
	int a;
	int i;

	a = 0;
	for (i = 0; i <= MAX_LOG_DEV; i++)
		a += IBM_DS(host_index).ldn_inquiry_access[i];
	return (a);
}

static int ldn_access_total_modeselect(int host_index)
{
	int a;
	int i;

	a = 0;
	for (i = 0; i <= MAX_LOG_DEV; i++)
		a += IBM_DS(host_index).ldn_modeselect_access[i];
	return (a);
}

/* routine to display info in the proc-fs-structure (a deluxe feature) */
static int ibmmca_proc_info(struct Scsi_Host *shpnt, char *buffer, char **start, off_t offset, int length, int inout)
{
	int len = 0;
	int i, id, lun, host_index;
	unsigned long flags;
	int max_pun;

	for (i = 0; hosts[i] && hosts[i] != shpnt; i++);
	
	spin_lock_irqsave(hosts[i]->host_lock, flags);	/* Check it */
	host_index = i;
	if (!shpnt) {
		len += sprintf(buffer + len, "\nIBM MCA SCSI: Can't find adapter for host number %d\n",
				shpnt->host_no);
		return len;
	}
	max_pun = subsystem_maxid(host_index);

	len += sprintf(buffer + len, "\n             IBM-SCSI-Subsystem-Linux-Driver, Version %s\n\n\n", IBMMCA_SCSI_DRIVER_VERSION);
	len += sprintf(buffer + len, " SCSI Access-Statistics:\n");
	len += sprintf(buffer + len, "               Device Scanning Order....: %s\n", (ibm_ansi_order) ? "IBM/ANSI" : "New Industry Standard");
#ifdef CONFIG_SCSI_MULTI_LUN
	len += sprintf(buffer + len, "               Multiple LUN probing.....: Yes\n");
#else
	len += sprintf(buffer + len, "               Multiple LUN probing.....: No\n");
#endif
	len += sprintf(buffer + len, "               This Hostnumber..........: %d\n", shpnt->host_no);
	len += sprintf(buffer + len, "               Base I/O-Port............: 0x%x\n", (unsigned int) (IM_CMD_REG(host_index)));
	len += sprintf(buffer + len, "               (Shared) IRQ.............: %d\n", IM_IRQ);
	len += sprintf(buffer + len, "               Total Interrupts.........: %d\n", IBM_DS(host_index).total_interrupts);
	len += sprintf(buffer + len, "               Total SCSI Accesses......: %d\n", IBM_DS(host_index).total_accesses);
	len += sprintf(buffer + len, "               Total short SCBs.........: %d\n", IBM_DS(host_index).scbs);
	len += sprintf(buffer + len, "               Total long SCBs..........: %d\n", IBM_DS(host_index).long_scbs);
	len += sprintf(buffer + len, "                 Total SCSI READ/WRITE..: %d\n", ldn_access_total_read_write(host_index));
	len += sprintf(buffer + len, "                 Total SCSI Inquiries...: %d\n", ldn_access_total_inquiry(host_index));
	len += sprintf(buffer + len, "                 Total SCSI Modeselects.: %d\n", ldn_access_total_modeselect(host_index));
	len += sprintf(buffer + len, "                 Total SCSI other cmds..: %d\n", IBM_DS(host_index).total_accesses - ldn_access_total_read_write(host_index)
		       - ldn_access_total_modeselect(host_index)
		       - ldn_access_total_inquiry(host_index));
	len += sprintf(buffer + len, "               Total SCSI command fails.: %d\n\n", IBM_DS(host_index).total_errors);
	len += sprintf(buffer + len, " Logical-Device-Number (LDN) Access-Statistics:\n");
	len += sprintf(buffer + len, "         LDN | Accesses [%%] |   READ    |   WRITE   | ASSIGNMENTS\n");
	len += sprintf(buffer + len, "        -----|--------------|-----------|-----------|--------------\n");
	for (i = 0; i <= MAX_LOG_DEV; i++)
		len += sprintf(buffer + len, "         %2X  |    %3d       |  %8d |  %8d | %8d\n", i, ldn_access_load(host_index, i), IBM_DS(host_index).ldn_read_access[i], IBM_DS(host_index).ldn_write_access[i], IBM_DS(host_index).ldn_assignments[i]);
	len += sprintf(buffer + len, "        -----------------------------------------------------------\n\n");
	len += sprintf(buffer + len, " Dynamical-LDN-Assignment-Statistics:\n");
	len += sprintf(buffer + len, "               Number of physical SCSI-devices..: %d (+ Adapter)\n", IBM_DS(host_index).total_scsi_devices);
	len += sprintf(buffer + len, "               Dynamical Assignment necessary...: %s\n", IBM_DS(host_index).dyn_flag ? "Yes" : "No ");
	len += sprintf(buffer + len, "               Next LDN to be assigned..........: 0x%x\n", next_ldn(host_index));
	len += sprintf(buffer + len, "               Dynamical assignments done yet...: %d\n", IBM_DS(host_index).dynamical_assignments);
	len += sprintf(buffer + len, "\n Current SCSI-Device-Mapping:\n");
	len += sprintf(buffer + len, "        Physical SCSI-Device Map               Logical SCSI-Device Map\n");
	len += sprintf(buffer + len, "    ID\\LUN  0  1  2  3  4  5  6  7       ID\\LUN  0  1  2  3  4  5  6  7\n");
	for (id = 0; id < max_pun; id++) {
		len += sprintf(buffer + len, "    %2d     ", id);
		for (lun = 0; lun < 8; lun++)
			len += sprintf(buffer + len, "%2s ", ti_p(get_scsi(host_index)[id][lun]));
		len += sprintf(buffer + len, "      %2d     ", id);
		for (lun = 0; lun < 8; lun++)
			len += sprintf(buffer + len, "%2s ", ti_l(get_ldn(host_index)[id][lun]));
		len += sprintf(buffer + len, "\n");
	}

	len += sprintf(buffer + len, "(A = IBM-Subsystem, D = Harddisk, T = Tapedrive, P = Processor, W = WORM,\n");
	len += sprintf(buffer + len, " R = CD-ROM, S = Scanner, M = MO-Drive, C = Medium-Changer, + = unprovided LUN,\n");
	len += sprintf(buffer + len, " - = nothing found, nothing assigned or unprobed LUN)\n\n");

	*start = buffer + offset;
	len -= offset;
	if (len > length)
		len = length;
	spin_unlock_irqrestore(shpnt->host_lock, flags);
	return len;
}

static int option_setup(char *str)
{
	int ints[IM_MAX_HOSTS];
	char *cur = str;
	int i = 1;

	while (cur && isdigit(*cur) && i <= IM_MAX_HOSTS) {
		ints[i++] = simple_strtoul(cur, NULL, 0);
		if ((cur = strchr(cur, ',')) != NULL)
			cur++;
	}
	ints[0] = i - 1;
	internal_ibmmca_scsi_setup(cur, ints);
	return 0;
}

__setup("ibmmcascsi=", option_setup);

static struct scsi_host_template driver_template = {
          .proc_name      = "ibmmca",
	  .proc_info	  = ibmmca_proc_info,
          .name           = "IBM SCSI-Subsystem",
          .detect         = ibmmca_detect,
          .release        = ibmmca_release,
          .queuecommand   = ibmmca_queuecommand,
	  .eh_abort_handler = ibmmca_abort,
	  .eh_host_reset_handler = ibmmca_host_reset,
          .bios_param     = ibmmca_biosparam,
          .can_queue      = 16,
          .this_id        = 7,
          .sg_tablesize   = 16,
          .cmd_per_lun    = 1,
          .use_clustering = ENABLE_CLUSTERING,
};
#include "scsi_module.c"