summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/sym53c8xx_2/sym_hipd.c
blob: a428cae4535b7086979916a9bb293f7359a04669 (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
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family 
 * of PCI-SCSI IO processors.
 *
 * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
 * Copyright (c) 2003-2005  Matthew Wilcox <matthew@wil.cx>
 *
 * This driver is derived from the Linux sym53c8xx driver.
 * Copyright (C) 1998-2000  Gerard Roudier
 *
 * The sym53c8xx driver is derived from the ncr53c8xx driver that had been 
 * a port of the FreeBSD ncr driver to Linux-1.2.13.
 *
 * The original ncr driver has been written for 386bsd and FreeBSD by
 *         Wolfgang Stanglmeier        <wolf@cologne.de>
 *         Stefan Esser                <se@mi.Uni-Koeln.de>
 * Copyright (C) 1994  Wolfgang Stanglmeier
 *
 * Other major contributions:
 *
 * NVRAM detection and reading.
 * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
 *
 *-----------------------------------------------------------------------------
 */

#include <linux/slab.h>
#include <asm/param.h>		/* for timeouts in units of HZ */

#include "sym_glue.h"
#include "sym_nvram.h"

#if 0
#define SYM_DEBUG_GENERIC_SUPPORT
#endif

/*
 *  Needed function prototypes.
 */
static void sym_int_ma (struct sym_hcb *np);
static void sym_int_sir(struct sym_hcb *);
static struct sym_ccb *sym_alloc_ccb(struct sym_hcb *np);
static struct sym_ccb *sym_ccb_from_dsa(struct sym_hcb *np, u32 dsa);
static void sym_alloc_lcb_tags (struct sym_hcb *np, u_char tn, u_char ln);
static void sym_complete_error (struct sym_hcb *np, struct sym_ccb *cp);
static void sym_complete_ok (struct sym_hcb *np, struct sym_ccb *cp);
static int sym_compute_residual(struct sym_hcb *np, struct sym_ccb *cp);

/*
 *  Print a buffer in hexadecimal format with a ".\n" at end.
 */
static void sym_printl_hex(u_char *p, int n)
{
	while (n-- > 0)
		printf (" %x", *p++);
	printf (".\n");
}

static void sym_print_msg(struct sym_ccb *cp, char *label, u_char *msg)
{
	sym_print_addr(cp->cmd, "%s: ", label);

	spi_print_msg(msg);
	printf("\n");
}

static void sym_print_nego_msg(struct sym_hcb *np, int target, char *label, u_char *msg)
{
	struct sym_tcb *tp = &np->target[target];
	dev_info(&tp->starget->dev, "%s: ", label);

	spi_print_msg(msg);
	printf("\n");
}

/*
 *  Print something that tells about extended errors.
 */
void sym_print_xerr(struct scsi_cmnd *cmd, int x_status)
{
	if (x_status & XE_PARITY_ERR) {
		sym_print_addr(cmd, "unrecovered SCSI parity error.\n");
	}
	if (x_status & XE_EXTRA_DATA) {
		sym_print_addr(cmd, "extraneous data discarded.\n");
	}
	if (x_status & XE_BAD_PHASE) {
		sym_print_addr(cmd, "illegal scsi phase (4/5).\n");
	}
	if (x_status & XE_SODL_UNRUN) {
		sym_print_addr(cmd, "ODD transfer in DATA OUT phase.\n");
	}
	if (x_status & XE_SWIDE_OVRUN) {
		sym_print_addr(cmd, "ODD transfer in DATA IN phase.\n");
	}
}

/*
 *  Return a string for SCSI BUS mode.
 */
static char *sym_scsi_bus_mode(int mode)
{
	switch(mode) {
	case SMODE_HVD:	return "HVD";
	case SMODE_SE:	return "SE";
	case SMODE_LVD: return "LVD";
	}
	return "??";
}

/*
 *  Soft reset the chip.
 *
 *  Raising SRST when the chip is running may cause 
 *  problems on dual function chips (see below).
 *  On the other hand, LVD devices need some delay 
 *  to settle and report actual BUS mode in STEST4.
 */
static void sym_chip_reset (struct sym_hcb *np)
{
	OUTB(np, nc_istat, SRST);
	INB(np, nc_mbox1);
	udelay(10);
	OUTB(np, nc_istat, 0);
	INB(np, nc_mbox1);
	udelay(2000);	/* For BUS MODE to settle */
}

/*
 *  Really soft reset the chip.:)
 *
 *  Some 896 and 876 chip revisions may hang-up if we set 
 *  the SRST (soft reset) bit at the wrong time when SCRIPTS 
 *  are running.
 *  So, we need to abort the current operation prior to 
 *  soft resetting the chip.
 */
static void sym_soft_reset (struct sym_hcb *np)
{
	u_char istat = 0;
	int i;

	if (!(np->features & FE_ISTAT1) || !(INB(np, nc_istat1) & SCRUN))
		goto do_chip_reset;

	OUTB(np, nc_istat, CABRT);
	for (i = 100000 ; i ; --i) {
		istat = INB(np, nc_istat);
		if (istat & SIP) {
			INW(np, nc_sist);
		}
		else if (istat & DIP) {
			if (INB(np, nc_dstat) & ABRT)
				break;
		}
		udelay(5);
	}
	OUTB(np, nc_istat, 0);
	if (!i)
		printf("%s: unable to abort current chip operation, "
		       "ISTAT=0x%02x.\n", sym_name(np), istat);
do_chip_reset:
	sym_chip_reset(np);
}

/*
 *  Start reset process.
 *
 *  The interrupt handler will reinitialize the chip.
 */
static void sym_start_reset(struct sym_hcb *np)
{
	sym_reset_scsi_bus(np, 1);
}
 
int sym_reset_scsi_bus(struct sym_hcb *np, int enab_int)
{
	u32 term;
	int retv = 0;

	sym_soft_reset(np);	/* Soft reset the chip */
	if (enab_int)
		OUTW(np, nc_sien, RST);
	/*
	 *  Enable Tolerant, reset IRQD if present and 
	 *  properly set IRQ mode, prior to resetting the bus.
	 */
	OUTB(np, nc_stest3, TE);
	OUTB(np, nc_dcntl, (np->rv_dcntl & IRQM));
	OUTB(np, nc_scntl1, CRST);
	INB(np, nc_mbox1);
	udelay(200);

	if (!SYM_SETUP_SCSI_BUS_CHECK)
		goto out;
	/*
	 *  Check for no terminators or SCSI bus shorts to ground.
	 *  Read SCSI data bus, data parity bits and control signals.
	 *  We are expecting RESET to be TRUE and other signals to be 
	 *  FALSE.
	 */
	term =	INB(np, nc_sstat0);
	term =	((term & 2) << 7) + ((term & 1) << 17);	/* rst sdp0 */
	term |= ((INB(np, nc_sstat2) & 0x01) << 26) |	/* sdp1     */
		((INW(np, nc_sbdl) & 0xff)   << 9)  |	/* d7-0     */
		((INW(np, nc_sbdl) & 0xff00) << 10) |	/* d15-8    */
		INB(np, nc_sbcl);	/* req ack bsy sel atn msg cd io    */

	if (!np->maxwide)
		term &= 0x3ffff;

	if (term != (2<<7)) {
		printf("%s: suspicious SCSI data while resetting the BUS.\n",
			sym_name(np));
		printf("%s: %sdp0,d7-0,rst,req,ack,bsy,sel,atn,msg,c/d,i/o = "
			"0x%lx, expecting 0x%lx\n",
			sym_name(np),
			(np->features & FE_WIDE) ? "dp1,d15-8," : "",
			(u_long)term, (u_long)(2<<7));
		if (SYM_SETUP_SCSI_BUS_CHECK == 1)
			retv = 1;
	}
out:
	OUTB(np, nc_scntl1, 0);
	return retv;
}

/*
 *  Select SCSI clock frequency
 */
static void sym_selectclock(struct sym_hcb *np, u_char scntl3)
{
	/*
	 *  If multiplier not present or not selected, leave here.
	 */
	if (np->multiplier <= 1) {
		OUTB(np, nc_scntl3, scntl3);
		return;
	}

	if (sym_verbose >= 2)
		printf ("%s: enabling clock multiplier\n", sym_name(np));

	OUTB(np, nc_stest1, DBLEN);	   /* Enable clock multiplier */
	/*
	 *  Wait for the LCKFRQ bit to be set if supported by the chip.
	 *  Otherwise wait 50 micro-seconds (at least).
	 */
	if (np->features & FE_LCKFRQ) {
		int i = 20;
		while (!(INB(np, nc_stest4) & LCKFRQ) && --i > 0)
			udelay(20);
		if (!i)
			printf("%s: the chip cannot lock the frequency\n",
				sym_name(np));
	} else {
		INB(np, nc_mbox1);
		udelay(50+10);
	}
	OUTB(np, nc_stest3, HSC);		/* Halt the scsi clock	*/
	OUTB(np, nc_scntl3, scntl3);
	OUTB(np, nc_stest1, (DBLEN|DBLSEL));/* Select clock multiplier	*/
	OUTB(np, nc_stest3, 0x00);		/* Restart scsi clock 	*/
}


/*
 *  Determine the chip's clock frequency.
 *
 *  This is essential for the negotiation of the synchronous 
 *  transfer rate.
 *
 *  Note: we have to return the correct value.
 *  THERE IS NO SAFE DEFAULT VALUE.
 *
 *  Most NCR/SYMBIOS boards are delivered with a 40 Mhz clock.
 *  53C860 and 53C875 rev. 1 support fast20 transfers but 
 *  do not have a clock doubler and so are provided with a 
 *  80 MHz clock. All other fast20 boards incorporate a doubler 
 *  and so should be delivered with a 40 MHz clock.
 *  The recent fast40 chips (895/896/895A/1010) use a 40 Mhz base 
 *  clock and provide a clock quadrupler (160 Mhz).
 */

/*
 *  calculate SCSI clock frequency (in KHz)
 */
static unsigned getfreq (struct sym_hcb *np, int gen)
{
	unsigned int ms = 0;
	unsigned int f;

	/*
	 * Measure GEN timer delay in order 
	 * to calculate SCSI clock frequency
	 *
	 * This code will never execute too
	 * many loop iterations (if DELAY is 
	 * reasonably correct). It could get
	 * too low a delay (too high a freq.)
	 * if the CPU is slow executing the 
	 * loop for some reason (an NMI, for
	 * example). For this reason we will
	 * if multiple measurements are to be 
	 * performed trust the higher delay 
	 * (lower frequency returned).
	 */
	OUTW(np, nc_sien, 0);	/* mask all scsi interrupts */
	INW(np, nc_sist);	/* clear pending scsi interrupt */
	OUTB(np, nc_dien, 0);	/* mask all dma interrupts */
	INW(np, nc_sist);	/* another one, just to be sure :) */
	/*
	 * The C1010-33 core does not report GEN in SIST,
	 * if this interrupt is masked in SIEN.
	 * I don't know yet if the C1010-66 behaves the same way.
	 */
	if (np->features & FE_C10) {
		OUTW(np, nc_sien, GEN);
		OUTB(np, nc_istat1, SIRQD);
	}
	OUTB(np, nc_scntl3, 4);	   /* set pre-scaler to divide by 3 */
	OUTB(np, nc_stime1, 0);	   /* disable general purpose timer */
	OUTB(np, nc_stime1, gen);  /* set to nominal delay of 1<<gen * 125us */
	while (!(INW(np, nc_sist) & GEN) && ms++ < 100000)
		udelay(1000/4);    /* count in 1/4 of ms */
	OUTB(np, nc_stime1, 0);    /* disable general purpose timer */
	/*
	 * Undo C1010-33 specific settings.
	 */
	if (np->features & FE_C10) {
		OUTW(np, nc_sien, 0);
		OUTB(np, nc_istat1, 0);
	}
 	/*
 	 * set prescaler to divide by whatever 0 means
 	 * 0 ought to choose divide by 2, but appears
 	 * to set divide by 3.5 mode in my 53c810 ...
 	 */
 	OUTB(np, nc_scntl3, 0);

  	/*
 	 * adjust for prescaler, and convert into KHz 
  	 */
	f = ms ? ((1 << gen) * (4340*4)) / ms : 0;

	/*
	 * The C1010-33 result is biased by a factor 
	 * of 2/3 compared to earlier chips.
	 */
	if (np->features & FE_C10)
		f = (f * 2) / 3;

	if (sym_verbose >= 2)
		printf ("%s: Delay (GEN=%d): %u msec, %u KHz\n",
			sym_name(np), gen, ms/4, f);

	return f;
}

static unsigned sym_getfreq (struct sym_hcb *np)
{
	u_int f1, f2;
	int gen = 8;

	getfreq (np, gen);	/* throw away first result */
	f1 = getfreq (np, gen);
	f2 = getfreq (np, gen);
	if (f1 > f2) f1 = f2;		/* trust lower result	*/
	return f1;
}

/*
 *  Get/probe chip SCSI clock frequency
 */
static void sym_getclock (struct sym_hcb *np, int mult)
{
	unsigned char scntl3 = np->sv_scntl3;
	unsigned char stest1 = np->sv_stest1;
	unsigned f1;

	np->multiplier = 1;
	f1 = 40000;
	/*
	 *  True with 875/895/896/895A with clock multiplier selected
	 */
	if (mult > 1 && (stest1 & (DBLEN+DBLSEL)) == DBLEN+DBLSEL) {
		if (sym_verbose >= 2)
			printf ("%s: clock multiplier found\n", sym_name(np));
		np->multiplier = mult;
	}

	/*
	 *  If multiplier not found or scntl3 not 7,5,3,
	 *  reset chip and get frequency from general purpose timer.
	 *  Otherwise trust scntl3 BIOS setting.
	 */
	if (np->multiplier != mult || (scntl3 & 7) < 3 || !(scntl3 & 1)) {
		OUTB(np, nc_stest1, 0);		/* make sure doubler is OFF */
		f1 = sym_getfreq (np);

		if (sym_verbose)
			printf ("%s: chip clock is %uKHz\n", sym_name(np), f1);

		if	(f1 <	45000)		f1 =  40000;
		else if (f1 <	55000)		f1 =  50000;
		else				f1 =  80000;

		if (f1 < 80000 && mult > 1) {
			if (sym_verbose >= 2)
				printf ("%s: clock multiplier assumed\n",
					sym_name(np));
			np->multiplier	= mult;
		}
	} else {
		if	((scntl3 & 7) == 3)	f1 =  40000;
		else if	((scntl3 & 7) == 5)	f1 =  80000;
		else 				f1 = 160000;

		f1 /= np->multiplier;
	}

	/*
	 *  Compute controller synchronous parameters.
	 */
	f1		*= np->multiplier;
	np->clock_khz	= f1;
}

/*
 *  Get/probe PCI clock frequency
 */
static int sym_getpciclock (struct sym_hcb *np)
{
	int f = 0;

	/*
	 *  For now, we only need to know about the actual 
	 *  PCI BUS clock frequency for C1010-66 chips.
	 */
#if 1
	if (np->features & FE_66MHZ) {
#else
	if (1) {
#endif
		OUTB(np, nc_stest1, SCLK); /* Use the PCI clock as SCSI clock */
		f = sym_getfreq(np);
		OUTB(np, nc_stest1, 0);
	}
	np->pciclk_khz = f;

	return f;
}

/*
 *  SYMBIOS chip clock divisor table.
 *
 *  Divisors are multiplied by 10,000,000 in order to make 
 *  calculations more simple.
 */
#define _5M 5000000
static const u32 div_10M[] = {2*_5M, 3*_5M, 4*_5M, 6*_5M, 8*_5M, 12*_5M, 16*_5M};

/*
 *  Get clock factor and sync divisor for a given 
 *  synchronous factor period.
 */
static int 
sym_getsync(struct sym_hcb *np, u_char dt, u_char sfac, u_char *divp, u_char *fakp)
{
	u32	clk = np->clock_khz;	/* SCSI clock frequency in kHz	*/
	int	div = np->clock_divn;	/* Number of divisors supported	*/
	u32	fak;			/* Sync factor in sxfer		*/
	u32	per;			/* Period in tenths of ns	*/
	u32	kpc;			/* (per * clk)			*/
	int	ret;

	/*
	 *  Compute the synchronous period in tenths of nano-seconds
	 */
	if (dt && sfac <= 9)	per = 125;
	else if	(sfac <= 10)	per = 250;
	else if	(sfac == 11)	per = 303;
	else if	(sfac == 12)	per = 500;
	else			per = 40 * sfac;
	ret = per;

	kpc = per * clk;
	if (dt)
		kpc <<= 1;

	/*
	 *  For earliest C10 revision 0, we cannot use extra 
	 *  clocks for the setting of the SCSI clocking.
	 *  Note that this limits the lowest sync data transfer 
	 *  to 5 Mega-transfers per second and may result in
	 *  using higher clock divisors.
	 */
#if 1
	if ((np->features & (FE_C10|FE_U3EN)) == FE_C10) {
		/*
		 *  Look for the lowest clock divisor that allows an 
		 *  output speed not faster than the period.
		 */
		while (div > 0) {
			--div;
			if (kpc > (div_10M[div] << 2)) {
				++div;
				break;
			}
		}
		fak = 0;			/* No extra clocks */
		if (div == np->clock_divn) {	/* Are we too fast ? */
			ret = -1;
		}
		*divp = div;
		*fakp = fak;
		return ret;
	}
#endif

	/*
	 *  Look for the greatest clock divisor that allows an 
	 *  input speed faster than the period.
	 */
	while (--div > 0)
		if (kpc >= (div_10M[div] << 2)) break;

	/*
	 *  Calculate the lowest clock factor that allows an output 
	 *  speed not faster than the period, and the max output speed.
	 *  If fak >= 1 we will set both XCLKH_ST and XCLKH_DT.
	 *  If fak >= 2 we will also set XCLKS_ST and XCLKS_DT.
	 */
	if (dt) {
		fak = (kpc - 1) / (div_10M[div] << 1) + 1 - 2;
		/* ret = ((2+fak)*div_10M[div])/np->clock_khz; */
	} else {
		fak = (kpc - 1) / div_10M[div] + 1 - 4;
		/* ret = ((4+fak)*div_10M[div])/np->clock_khz; */
	}

	/*
	 *  Check against our hardware limits, or bugs :).
	 */
	if (fak > 2) {
		fak = 2;
		ret = -1;
	}

	/*
	 *  Compute and return sync parameters.
	 */
	*divp = div;
	*fakp = fak;

	return ret;
}

/*
 *  SYMBIOS chips allow burst lengths of 2, 4, 8, 16, 32, 64,
 *  128 transfers. All chips support at least 16 transfers 
 *  bursts. The 825A, 875 and 895 chips support bursts of up 
 *  to 128 transfers and the 895A and 896 support bursts of up
 *  to 64 transfers. All other chips support up to 16 
 *  transfers bursts.
 *
 *  For PCI 32 bit data transfers each transfer is a DWORD.
 *  It is a QUADWORD (8 bytes) for PCI 64 bit data transfers.
 *
 *  We use log base 2 (burst length) as internal code, with 
 *  value 0 meaning "burst disabled".
 */

/*
 *  Burst length from burst code.
 */
#define burst_length(bc) (!(bc))? 0 : 1 << (bc)

/*
 *  Burst code from io register bits.
 */
#define burst_code(dmode, ctest4, ctest5) \
	(ctest4) & 0x80? 0 : (((dmode) & 0xc0) >> 6) + ((ctest5) & 0x04) + 1

/*
 *  Set initial io register bits from burst code.
 */
static inline void sym_init_burst(struct sym_hcb *np, u_char bc)
{
	np->rv_ctest4	&= ~0x80;
	np->rv_dmode	&= ~(0x3 << 6);
	np->rv_ctest5	&= ~0x4;

	if (!bc) {
		np->rv_ctest4	|= 0x80;
	}
	else {
		--bc;
		np->rv_dmode	|= ((bc & 0x3) << 6);
		np->rv_ctest5	|= (bc & 0x4);
	}
}

/*
 *  Save initial settings of some IO registers.
 *  Assumed to have been set by BIOS.
 *  We cannot reset the chip prior to reading the 
 *  IO registers, since informations will be lost.
 *  Since the SCRIPTS processor may be running, this 
 *  is not safe on paper, but it seems to work quite 
 *  well. :)
 */
static void sym_save_initial_setting (struct sym_hcb *np)
{
	np->sv_scntl0	= INB(np, nc_scntl0) & 0x0a;
	np->sv_scntl3	= INB(np, nc_scntl3) & 0x07;
	np->sv_dmode	= INB(np, nc_dmode)  & 0xce;
	np->sv_dcntl	= INB(np, nc_dcntl)  & 0xa8;
	np->sv_ctest3	= INB(np, nc_ctest3) & 0x01;
	np->sv_ctest4	= INB(np, nc_ctest4) & 0x80;
	np->sv_gpcntl	= INB(np, nc_gpcntl);
	np->sv_stest1	= INB(np, nc_stest1);
	np->sv_stest2	= INB(np, nc_stest2) & 0x20;
	np->sv_stest4	= INB(np, nc_stest4);
	if (np->features & FE_C10) {	/* Always large DMA fifo + ultra3 */
		np->sv_scntl4	= INB(np, nc_scntl4);
		np->sv_ctest5	= INB(np, nc_ctest5) & 0x04;
	}
	else
		np->sv_ctest5	= INB(np, nc_ctest5) & 0x24;
}

/*
 *  Set SCSI BUS mode.
 *  - LVD capable chips (895/895A/896/1010) report the current BUS mode
 *    through the STEST4 IO register.
 *  - For previous generation chips (825/825A/875), the user has to tell us
 *    how to check against HVD, since a 100% safe algorithm is not possible.
 */
static void sym_set_bus_mode(struct sym_hcb *np, struct sym_nvram *nvram)
{
	if (np->scsi_mode)
		return;

	np->scsi_mode = SMODE_SE;
	if (np->features & (FE_ULTRA2|FE_ULTRA3))
		np->scsi_mode = (np->sv_stest4 & SMODE);
	else if	(np->features & FE_DIFF) {
		if (SYM_SETUP_SCSI_DIFF == 1) {
			if (np->sv_scntl3) {
				if (np->sv_stest2 & 0x20)
					np->scsi_mode = SMODE_HVD;
			} else if (nvram->type == SYM_SYMBIOS_NVRAM) {
				if (!(INB(np, nc_gpreg) & 0x08))
					np->scsi_mode = SMODE_HVD;
			}
		} else if (SYM_SETUP_SCSI_DIFF == 2)
			np->scsi_mode = SMODE_HVD;
	}
	if (np->scsi_mode == SMODE_HVD)
		np->rv_stest2 |= 0x20;
}

/*
 *  Prepare io register values used by sym_start_up() 
 *  according to selected and supported features.
 */
static int sym_prepare_setting(struct Scsi_Host *shost, struct sym_hcb *np, struct sym_nvram *nvram)
{
	struct sym_data *sym_data = shost_priv(shost);
	struct pci_dev *pdev = sym_data->pdev;
	u_char	burst_max;
	u32	period;
	int i;

	np->maxwide = (np->features & FE_WIDE) ? 1 : 0;

	/*
	 *  Guess the frequency of the chip's clock.
	 */
	if	(np->features & (FE_ULTRA3 | FE_ULTRA2))
		np->clock_khz = 160000;
	else if	(np->features & FE_ULTRA)
		np->clock_khz = 80000;
	else
		np->clock_khz = 40000;

	/*
	 *  Get the clock multiplier factor.
 	 */
	if	(np->features & FE_QUAD)
		np->multiplier	= 4;
	else if	(np->features & FE_DBLR)
		np->multiplier	= 2;
	else
		np->multiplier	= 1;

	/*
	 *  Measure SCSI clock frequency for chips 
	 *  it may vary from assumed one.
	 */
	if (np->features & FE_VARCLK)
		sym_getclock(np, np->multiplier);

	/*
	 * Divisor to be used for async (timer pre-scaler).
	 */
	i = np->clock_divn - 1;
	while (--i >= 0) {
		if (10ul * SYM_CONF_MIN_ASYNC * np->clock_khz > div_10M[i]) {
			++i;
			break;
		}
	}
	np->rv_scntl3 = i+1;

	/*
	 * The C1010 uses hardwired divisors for async.
	 * So, we just throw away, the async. divisor.:-)
	 */
	if (np->features & FE_C10)
		np->rv_scntl3 = 0;

	/*
	 * Minimum synchronous period factor supported by the chip.
	 * Btw, 'period' is in tenths of nanoseconds.
	 */
	period = (4 * div_10M[0] + np->clock_khz - 1) / np->clock_khz;

	if	(period <= 250)		np->minsync = 10;
	else if	(period <= 303)		np->minsync = 11;
	else if	(period <= 500)		np->minsync = 12;
	else				np->minsync = (period + 40 - 1) / 40;

	/*
	 * Check against chip SCSI standard support (SCSI-2,ULTRA,ULTRA2).
	 */
	if	(np->minsync < 25 &&
		 !(np->features & (FE_ULTRA|FE_ULTRA2|FE_ULTRA3)))
		np->minsync = 25;
	else if	(np->minsync < 12 &&
		 !(np->features & (FE_ULTRA2|FE_ULTRA3)))
		np->minsync = 12;

	/*
	 * Maximum synchronous period factor supported by the chip.
	 */
	period = div64_ul(11 * div_10M[np->clock_divn - 1], 4 * np->clock_khz);
	np->maxsync = period > 2540 ? 254 : period / 10;

	/*
	 * If chip is a C1010, guess the sync limits in DT mode.
	 */
	if ((np->features & (FE_C10|FE_ULTRA3)) == (FE_C10|FE_ULTRA3)) {
		if (np->clock_khz == 160000) {
			np->minsync_dt = 9;
			np->maxsync_dt = 50;
			np->maxoffs_dt = nvram->type ? 62 : 31;
		}
	}
	
	/*
	 *  64 bit addressing  (895A/896/1010) ?
	 */
	if (np->features & FE_DAC) {
		if (!use_dac(np))
			np->rv_ccntl1 |= (DDAC);
		else if (SYM_CONF_DMA_ADDRESSING_MODE == 1)
			np->rv_ccntl1 |= (XTIMOD | EXTIBMV);
		else if (SYM_CONF_DMA_ADDRESSING_MODE == 2)
			np->rv_ccntl1 |= (0 | EXTIBMV);
	}

	/*
	 *  Phase mismatch handled by SCRIPTS (895A/896/1010) ?
  	 */
	if (np->features & FE_NOPM)
		np->rv_ccntl0	|= (ENPMJ);

 	/*
	 *  C1010-33 Errata: Part Number:609-039638 (rev. 1) is fixed.
	 *  In dual channel mode, contention occurs if internal cycles
	 *  are used. Disable internal cycles.
	 */
	if (pdev->device == PCI_DEVICE_ID_LSI_53C1010_33 &&
	    pdev->revision < 0x1)
		np->rv_ccntl0	|=  DILS;

	/*
	 *  Select burst length (dwords)
	 */
	burst_max	= SYM_SETUP_BURST_ORDER;
	if (burst_max == 255)
		burst_max = burst_code(np->sv_dmode, np->sv_ctest4,
				       np->sv_ctest5);
	if (burst_max > 7)
		burst_max = 7;
	if (burst_max > np->maxburst)
		burst_max = np->maxburst;

	/*
	 *  DEL 352 - 53C810 Rev x11 - Part Number 609-0392140 - ITEM 2.
	 *  This chip and the 860 Rev 1 may wrongly use PCI cache line 
	 *  based transactions on LOAD/STORE instructions. So we have 
	 *  to prevent these chips from using such PCI transactions in 
	 *  this driver. The generic ncr driver that does not use 
	 *  LOAD/STORE instructions does not need this work-around.
	 */
	if ((pdev->device == PCI_DEVICE_ID_NCR_53C810 &&
	     pdev->revision >= 0x10 && pdev->revision <= 0x11) ||
	    (pdev->device == PCI_DEVICE_ID_NCR_53C860 &&
	     pdev->revision <= 0x1))
		np->features &= ~(FE_WRIE|FE_ERL|FE_ERMP);

	/*
	 *  Select all supported special features.
	 *  If we are using on-board RAM for scripts, prefetch (PFEN) 
	 *  does not help, but burst op fetch (BOF) does.
	 *  Disabling PFEN makes sure BOF will be used.
	 */
	if (np->features & FE_ERL)
		np->rv_dmode	|= ERL;		/* Enable Read Line */
	if (np->features & FE_BOF)
		np->rv_dmode	|= BOF;		/* Burst Opcode Fetch */
	if (np->features & FE_ERMP)
		np->rv_dmode	|= ERMP;	/* Enable Read Multiple */
#if 1
	if ((np->features & FE_PFEN) && !np->ram_ba)
#else
	if (np->features & FE_PFEN)
#endif
		np->rv_dcntl	|= PFEN;	/* Prefetch Enable */
	if (np->features & FE_CLSE)
		np->rv_dcntl	|= CLSE;	/* Cache Line Size Enable */
	if (np->features & FE_WRIE)
		np->rv_ctest3	|= WRIE;	/* Write and Invalidate */
	if (np->features & FE_DFS)
		np->rv_ctest5	|= DFS;		/* Dma Fifo Size */

	/*
	 *  Select some other
	 */
	np->rv_ctest4	|= MPEE; /* Master parity checking */
	np->rv_scntl0	|= 0x0a; /*  full arb., ena parity, par->ATN  */

	/*
	 *  Get parity checking, host ID and verbose mode from NVRAM
	 */
	np->myaddr = 255;
	np->scsi_mode = 0;
	sym_nvram_setup_host(shost, np, nvram);

	/*
	 *  Get SCSI addr of host adapter (set by bios?).
	 */
	if (np->myaddr == 255) {
		np->myaddr = INB(np, nc_scid) & 0x07;
		if (!np->myaddr)
			np->myaddr = SYM_SETUP_HOST_ID;
	}

	/*
	 *  Prepare initial io register bits for burst length
	 */
	sym_init_burst(np, burst_max);

	sym_set_bus_mode(np, nvram);

	/*
	 *  Set LED support from SCRIPTS.
	 *  Ignore this feature for boards known to use a 
	 *  specific GPIO wiring and for the 895A, 896 
	 *  and 1010 that drive the LED directly.
	 */
	if ((SYM_SETUP_SCSI_LED || 
	     (nvram->type == SYM_SYMBIOS_NVRAM ||
	      (nvram->type == SYM_TEKRAM_NVRAM &&
	       pdev->device == PCI_DEVICE_ID_NCR_53C895))) &&
	    !(np->features & FE_LEDC) && !(np->sv_gpcntl & 0x01))
		np->features |= FE_LED0;

	/*
	 *  Set irq mode.
	 */
	switch(SYM_SETUP_IRQ_MODE & 3) {
	case 2:
		np->rv_dcntl	|= IRQM;
		break;
	case 1:
		np->rv_dcntl	|= (np->sv_dcntl & IRQM);
		break;
	default:
		break;
	}

	/*
	 *  Configure targets according to driver setup.
	 *  If NVRAM present get targets setup from NVRAM.
	 */
	for (i = 0 ; i < SYM_CONF_MAX_TARGET ; i++) {
		struct sym_tcb *tp = &np->target[i];

		tp->usrflags |= (SYM_DISC_ENABLED | SYM_TAGS_ENABLED);
		tp->usrtags = SYM_SETUP_MAX_TAG;
		tp->usr_width = np->maxwide;
		tp->usr_period = 9;

		sym_nvram_setup_target(tp, i, nvram);

		if (!tp->usrtags)
			tp->usrflags &= ~SYM_TAGS_ENABLED;
	}

	/*
	 *  Let user know about the settings.
	 */
	printf("%s: %s, ID %d, Fast-%d, %s, %s\n", sym_name(np),
		sym_nvram_type(nvram), np->myaddr,
		(np->features & FE_ULTRA3) ? 80 : 
		(np->features & FE_ULTRA2) ? 40 : 
		(np->features & FE_ULTRA)  ? 20 : 10,
		sym_scsi_bus_mode(np->scsi_mode),
		(np->rv_scntl0 & 0xa)	? "parity checking" : "NO parity");
	/*
	 *  Tell him more on demand.
	 */
	if (sym_verbose) {
		printf("%s: %s IRQ line driver%s\n",
			sym_name(np),
			np->rv_dcntl & IRQM ? "totem pole" : "open drain",
			np->ram_ba ? ", using on-chip SRAM" : "");
		printf("%s: using %s firmware.\n", sym_name(np), np->fw_name);
		if (np->features & FE_NOPM)
			printf("%s: handling phase mismatch from SCRIPTS.\n", 
			       sym_name(np));
	}
	/*
	 *  And still more.
	 */
	if (sym_verbose >= 2) {
		printf ("%s: initial SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
			"(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
			sym_name(np), np->sv_scntl3, np->sv_dmode, np->sv_dcntl,
			np->sv_ctest3, np->sv_ctest4, np->sv_ctest5);

		printf ("%s: final   SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
			"(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
			sym_name(np), np->rv_scntl3, np->rv_dmode, np->rv_dcntl,
			np->rv_ctest3, np->rv_ctest4, np->rv_ctest5);
	}

	return 0;
}

/*
 *  Test the pci bus snoop logic :-(
 *
 *  Has to be called with interrupts disabled.
 */
#ifdef CONFIG_SCSI_SYM53C8XX_MMIO
static int sym_regtest(struct sym_hcb *np)
{
	register volatile u32 data;
	/*
	 *  chip registers may NOT be cached.
	 *  write 0xffffffff to a read only register area,
	 *  and try to read it back.
	 */
	data = 0xffffffff;
	OUTL(np, nc_dstat, data);
	data = INL(np, nc_dstat);
#if 1
	if (data == 0xffffffff) {
#else
	if ((data & 0xe2f0fffd) != 0x02000080) {
#endif
		printf ("CACHE TEST FAILED: reg dstat-sstat2 readback %x.\n",
			(unsigned) data);
		return 0x10;
	}
	return 0;
}
#else
static inline int sym_regtest(struct sym_hcb *np)
{
	return 0;
}
#endif

static int sym_snooptest(struct sym_hcb *np)
{
	u32 sym_rd, sym_wr, sym_bk, host_rd, host_wr, pc, dstat;
	int i, err;

	err = sym_regtest(np);
	if (err)
		return err;
restart_test:
	/*
	 *  Enable Master Parity Checking as we intend 
	 *  to enable it for normal operations.
	 */
	OUTB(np, nc_ctest4, (np->rv_ctest4 & MPEE));
	/*
	 *  init
	 */
	pc  = SCRIPTZ_BA(np, snooptest);
	host_wr = 1;
	sym_wr  = 2;
	/*
	 *  Set memory and register.
	 */
	np->scratch = cpu_to_scr(host_wr);
	OUTL(np, nc_temp, sym_wr);
	/*
	 *  Start script (exchange values)
	 */
	OUTL(np, nc_dsa, np->hcb_ba);
	OUTL_DSP(np, pc);
	/*
	 *  Wait 'til done (with timeout)
	 */
	for (i=0; i<SYM_SNOOP_TIMEOUT; i++)
		if (INB(np, nc_istat) & (INTF|SIP|DIP))
			break;
	if (i>=SYM_SNOOP_TIMEOUT) {
		printf ("CACHE TEST FAILED: timeout.\n");
		return (0x20);
	}
	/*
	 *  Check for fatal DMA errors.
	 */
	dstat = INB(np, nc_dstat);
#if 1	/* Band aiding for broken hardwares that fail PCI parity */
	if ((dstat & MDPE) && (np->rv_ctest4 & MPEE)) {
		printf ("%s: PCI DATA PARITY ERROR DETECTED - "
			"DISABLING MASTER DATA PARITY CHECKING.\n",
			sym_name(np));
		np->rv_ctest4 &= ~MPEE;
		goto restart_test;
	}
#endif
	if (dstat & (MDPE|BF|IID)) {
		printf ("CACHE TEST FAILED: DMA error (dstat=0x%02x).", dstat);
		return (0x80);
	}
	/*
	 *  Save termination position.
	 */
	pc = INL(np, nc_dsp);
	/*
	 *  Read memory and register.
	 */
	host_rd = scr_to_cpu(np->scratch);
	sym_rd  = INL(np, nc_scratcha);
	sym_bk  = INL(np, nc_temp);
	/*
	 *  Check termination position.
	 */
	if (pc != SCRIPTZ_BA(np, snoopend)+8) {
		printf ("CACHE TEST FAILED: script execution failed.\n");
		printf ("start=%08lx, pc=%08lx, end=%08lx\n", 
			(u_long) SCRIPTZ_BA(np, snooptest), (u_long) pc,
			(u_long) SCRIPTZ_BA(np, snoopend) +8);
		return (0x40);
	}
	/*
	 *  Show results.
	 */
	if (host_wr != sym_rd) {
		printf ("CACHE TEST FAILED: host wrote %d, chip read %d.\n",
			(int) host_wr, (int) sym_rd);
		err |= 1;
	}
	if (host_rd != sym_wr) {
		printf ("CACHE TEST FAILED: chip wrote %d, host read %d.\n",
			(int) sym_wr, (int) host_rd);
		err |= 2;
	}
	if (sym_bk != sym_wr) {
		printf ("CACHE TEST FAILED: chip wrote %d, read back %d.\n",
			(int) sym_wr, (int) sym_bk);
		err |= 4;
	}

	return err;
}

/*
 *  log message for real hard errors
 *
 *  sym0 targ 0?: ERROR (ds:si) (so-si-sd) (sx/s3/s4) @ name (dsp:dbc).
 *  	      reg: r0 r1 r2 r3 r4 r5 r6 ..... rf.
 *
 *  exception register:
 *  	ds:	dstat
 *  	si:	sist
 *
 *  SCSI bus lines:
 *  	so:	control lines as driven by chip.
 *  	si:	control lines as seen by chip.
 *  	sd:	scsi data lines as seen by chip.
 *
 *  wide/fastmode:
 *  	sx:	sxfer  (see the manual)
 *  	s3:	scntl3 (see the manual)
 *  	s4:	scntl4 (see the manual)
 *
 *  current script command:
 *  	dsp:	script address (relative to start of script).
 *  	dbc:	first word of script command.
 *
 *  First 24 register of the chip:
 *  	r0..rf
 */
static void sym_log_hard_error(struct Scsi_Host *shost, u_short sist, u_char dstat)
{
	struct sym_hcb *np = sym_get_hcb(shost);
	u32	dsp;
	int	script_ofs;
	int	script_size;
	char	*script_name;
	u_char	*script_base;
	int	i;

	dsp	= INL(np, nc_dsp);

	if	(dsp > np->scripta_ba &&
		 dsp <= np->scripta_ba + np->scripta_sz) {
		script_ofs	= dsp - np->scripta_ba;
		script_size	= np->scripta_sz;
		script_base	= (u_char *) np->scripta0;
		script_name	= "scripta";
	}
	else if (np->scriptb_ba < dsp && 
		 dsp <= np->scriptb_ba + np->scriptb_sz) {
		script_ofs	= dsp - np->scriptb_ba;
		script_size	= np->scriptb_sz;
		script_base	= (u_char *) np->scriptb0;
		script_name	= "scriptb";
	} else {
		script_ofs	= dsp;
		script_size	= 0;
		script_base	= NULL;
		script_name	= "mem";
	}

	printf ("%s:%d: ERROR (%x:%x) (%x-%x-%x) (%x/%x/%x) @ (%s %x:%08x).\n",
		sym_name(np), (unsigned)INB(np, nc_sdid)&0x0f, dstat, sist,
		(unsigned)INB(np, nc_socl), (unsigned)INB(np, nc_sbcl),
		(unsigned)INB(np, nc_sbdl), (unsigned)INB(np, nc_sxfer),
		(unsigned)INB(np, nc_scntl3),
		(np->features & FE_C10) ?  (unsigned)INB(np, nc_scntl4) : 0,
		script_name, script_ofs,   (unsigned)INL(np, nc_dbc));

	if (((script_ofs & 3) == 0) &&
	    (unsigned)script_ofs < script_size) {
		printf ("%s: script cmd = %08x\n", sym_name(np),
			scr_to_cpu((int) *(u32 *)(script_base + script_ofs)));
	}

	printf("%s: regdump:", sym_name(np));
	for (i = 0; i < 24; i++)
		printf(" %02x", (unsigned)INB_OFF(np, i));
	printf(".\n");

	/*
	 *  PCI BUS error.
	 */
	if (dstat & (MDPE|BF))
		sym_log_bus_error(shost);
}

void sym_dump_registers(struct Scsi_Host *shost)
{
	struct sym_hcb *np = sym_get_hcb(shost);
	u_short sist;
	u_char dstat;

	sist = INW(np, nc_sist);
	dstat = INB(np, nc_dstat);
	sym_log_hard_error(shost, sist, dstat);
}

static struct sym_chip sym_dev_table[] = {
 {PCI_DEVICE_ID_NCR_53C810, 0x0f, "810", 4, 8, 4, 64,
 FE_ERL}
 ,
#ifdef SYM_DEBUG_GENERIC_SUPPORT
 {PCI_DEVICE_ID_NCR_53C810, 0xff, "810a", 4,  8, 4, 1,
 FE_BOF}
 ,
#else
 {PCI_DEVICE_ID_NCR_53C810, 0xff, "810a", 4,  8, 4, 1,
 FE_CACHE_SET|FE_LDSTR|FE_PFEN|FE_BOF}
 ,
#endif
 {PCI_DEVICE_ID_NCR_53C815, 0xff, "815", 4,  8, 4, 64,
 FE_BOF|FE_ERL}
 ,
 {PCI_DEVICE_ID_NCR_53C825, 0x0f, "825", 6,  8, 4, 64,
 FE_WIDE|FE_BOF|FE_ERL|FE_DIFF}
 ,
 {PCI_DEVICE_ID_NCR_53C825, 0xff, "825a", 6,  8, 4, 2,
 FE_WIDE|FE_CACHE0_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|FE_RAM|FE_DIFF}
 ,
 {PCI_DEVICE_ID_NCR_53C860, 0xff, "860", 4,  8, 5, 1,
 FE_ULTRA|FE_CACHE_SET|FE_BOF|FE_LDSTR|FE_PFEN}
 ,
 {PCI_DEVICE_ID_NCR_53C875, 0x01, "875", 6, 16, 5, 2,
 FE_WIDE|FE_ULTRA|FE_CACHE0_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_DIFF|FE_VARCLK}
 ,
 {PCI_DEVICE_ID_NCR_53C875, 0xff, "875", 6, 16, 5, 2,
 FE_WIDE|FE_ULTRA|FE_DBLR|FE_CACHE0_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_DIFF|FE_VARCLK}
 ,
 {PCI_DEVICE_ID_NCR_53C875J, 0xff, "875J", 6, 16, 5, 2,
 FE_WIDE|FE_ULTRA|FE_DBLR|FE_CACHE0_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_DIFF|FE_VARCLK}
 ,
 {PCI_DEVICE_ID_NCR_53C885, 0xff, "885", 6, 16, 5, 2,
 FE_WIDE|FE_ULTRA|FE_DBLR|FE_CACHE0_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_DIFF|FE_VARCLK}
 ,
#ifdef SYM_DEBUG_GENERIC_SUPPORT
 {PCI_DEVICE_ID_NCR_53C895, 0xff, "895", 6, 31, 7, 2,
 FE_WIDE|FE_ULTRA2|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFS|
 FE_RAM|FE_LCKFRQ}
 ,
#else
 {PCI_DEVICE_ID_NCR_53C895, 0xff, "895", 6, 31, 7, 2,
 FE_WIDE|FE_ULTRA2|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_LCKFRQ}
 ,
#endif
 {PCI_DEVICE_ID_NCR_53C896, 0xff, "896", 6, 31, 7, 4,
 FE_WIDE|FE_ULTRA2|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_RAM8K|FE_64BIT|FE_DAC|FE_IO256|FE_NOPM|FE_LEDC|FE_LCKFRQ}
 ,
 {PCI_DEVICE_ID_LSI_53C895A, 0xff, "895a", 6, 31, 7, 4,
 FE_WIDE|FE_ULTRA2|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_RAM8K|FE_DAC|FE_IO256|FE_NOPM|FE_LEDC|FE_LCKFRQ}
 ,
 {PCI_DEVICE_ID_LSI_53C875A, 0xff, "875a", 6, 31, 7, 4,
 FE_WIDE|FE_ULTRA|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_DAC|FE_IO256|FE_NOPM|FE_LEDC|FE_LCKFRQ}
 ,
 {PCI_DEVICE_ID_LSI_53C1010_33, 0x00, "1010-33", 6, 31, 7, 8,
 FE_WIDE|FE_ULTRA3|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFBC|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_RAM8K|FE_64BIT|FE_DAC|FE_IO256|FE_NOPM|FE_LEDC|FE_CRC|
 FE_C10}
 ,
 {PCI_DEVICE_ID_LSI_53C1010_33, 0xff, "1010-33", 6, 31, 7, 8,
 FE_WIDE|FE_ULTRA3|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFBC|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_RAM8K|FE_64BIT|FE_DAC|FE_IO256|FE_NOPM|FE_LEDC|FE_CRC|
 FE_C10|FE_U3EN}
 ,
 {PCI_DEVICE_ID_LSI_53C1010_66, 0xff, "1010-66", 6, 31, 7, 8,
 FE_WIDE|FE_ULTRA3|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFBC|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_RAM8K|FE_64BIT|FE_DAC|FE_IO256|FE_NOPM|FE_LEDC|FE_66MHZ|FE_CRC|
 FE_C10|FE_U3EN}
 ,
 {PCI_DEVICE_ID_LSI_53C1510, 0xff, "1510d", 6, 31, 7, 4,
 FE_WIDE|FE_ULTRA2|FE_QUAD|FE_CACHE_SET|FE_BOF|FE_DFS|FE_LDSTR|FE_PFEN|
 FE_RAM|FE_IO256|FE_LEDC}
};

#define sym_num_devs (ARRAY_SIZE(sym_dev_table))

/*
 *  Look up the chip table.
 *
 *  Return a pointer to the chip entry if found, 
 *  zero otherwise.
 */
struct sym_chip *
sym_lookup_chip_table (u_short device_id, u_char revision)
{
	struct	sym_chip *chip;
	int	i;

	for (i = 0; i < sym_num_devs; i++) {
		chip = &sym_dev_table[i];
		if (device_id != chip->device_id)
			continue;
		if (revision > chip->revision_id)
			continue;
		return chip;
	}

	return NULL;
}

#if SYM_CONF_DMA_ADDRESSING_MODE == 2
/*
 *  Lookup the 64 bit DMA segments map.
 *  This is only used if the direct mapping 
 *  has been unsuccessful.
 */
int sym_lookup_dmap(struct sym_hcb *np, u32 h, int s)
{
	int i;

	if (!use_dac(np))
		goto weird;

	/* Look up existing mappings */
	for (i = SYM_DMAP_SIZE-1; i > 0; i--) {
		if (h == np->dmap_bah[i])
			return i;
	}
	/* If direct mapping is free, get it */
	if (!np->dmap_bah[s])
		goto new;
	/* Collision -> lookup free mappings */
	for (s = SYM_DMAP_SIZE-1; s > 0; s--) {
		if (!np->dmap_bah[s])
			goto new;
	}
weird:
	panic("sym: ran out of 64 bit DMA segment registers");
	return -1;
new:
	np->dmap_bah[s] = h;
	np->dmap_dirty = 1;
	return s;
}

/*
 *  Update IO registers scratch C..R so they will be 
 *  in sync. with queued CCB expectations.
 */
static void sym_update_dmap_regs(struct sym_hcb *np)
{
	int o, i;

	if (!np->dmap_dirty)
		return;
	o = offsetof(struct sym_reg, nc_scrx[0]);
	for (i = 0; i < SYM_DMAP_SIZE; i++) {
		OUTL_OFF(np, o, np->dmap_bah[i]);
		o += 4;
	}
	np->dmap_dirty = 0;
}
#endif

/* Enforce all the fiddly SPI rules and the chip limitations */
static void sym_check_goals(struct sym_hcb *np, struct scsi_target *starget,
		struct sym_trans *goal)
{
	if (!spi_support_wide(starget))
		goal->width = 0;

	if (!spi_support_sync(starget)) {
		goal->iu = 0;
		goal->dt = 0;
		goal->qas = 0;
		goal->offset = 0;
		return;
	}

	if (spi_support_dt(starget)) {
		if (spi_support_dt_only(starget))
			goal->dt = 1;

		if (goal->offset == 0)
			goal->dt = 0;
	} else {
		goal->dt = 0;
	}

	/* Some targets fail to properly negotiate DT in SE mode */
	if ((np->scsi_mode != SMODE_LVD) || !(np->features & FE_U3EN))
		goal->dt = 0;

	if (goal->dt) {
		/* all DT transfers must be wide */
		goal->width = 1;
		if (goal->offset > np->maxoffs_dt)
			goal->offset = np->maxoffs_dt;
		if (goal->period < np->minsync_dt)
			goal->period = np->minsync_dt;
		if (goal->period > np->maxsync_dt)
			goal->period = np->maxsync_dt;
	} else {
		goal->iu = goal->qas = 0;
		if (goal->offset > np->maxoffs)
			goal->offset = np->maxoffs;
		if (goal->period < np->minsync)
			goal->period = np->minsync;
		if (goal->period > np->maxsync)
			goal->period = np->maxsync;
	}
}

/*
 *  Prepare the next negotiation message if needed.
 *
 *  Fill in the part of message buffer that contains the 
 *  negotiation and the nego_status field of the CCB.
 *  Returns the size of the message in bytes.
 */
static int sym_prepare_nego(struct sym_hcb *np, struct sym_ccb *cp, u_char *msgptr)
{
	struct sym_tcb *tp = &np->target[cp->target];
	struct scsi_target *starget = tp->starget;
	struct sym_trans *goal = &tp->tgoal;
	int msglen = 0;
	int nego;

	sym_check_goals(np, starget, goal);

	/*
	 * Many devices implement PPR in a buggy way, so only use it if we
	 * really want to.
	 */
	if (goal->renego == NS_PPR || (goal->offset &&
	    (goal->iu || goal->dt || goal->qas || (goal->period < 0xa)))) {
		nego = NS_PPR;
	} else if (goal->renego == NS_WIDE || goal->width) {
		nego = NS_WIDE;
	} else if (goal->renego == NS_SYNC || goal->offset) {
		nego = NS_SYNC;
	} else {
		goal->check_nego = 0;
		nego = 0;
	}

	switch (nego) {
	case NS_SYNC:
		msglen += spi_populate_sync_msg(msgptr + msglen, goal->period,
				goal->offset);
		break;
	case NS_WIDE:
		msglen += spi_populate_width_msg(msgptr + msglen, goal->width);
		break;
	case NS_PPR:
		msglen += spi_populate_ppr_msg(msgptr + msglen, goal->period,
				goal->offset, goal->width,
				(goal->iu ? PPR_OPT_IU : 0) |
					(goal->dt ? PPR_OPT_DT : 0) |
					(goal->qas ? PPR_OPT_QAS : 0));
		break;
	}

	cp->nego_status = nego;

	if (nego) {
		tp->nego_cp = cp; /* Keep track a nego will be performed */
		if (DEBUG_FLAGS & DEBUG_NEGO) {
			sym_print_nego_msg(np, cp->target, 
					  nego == NS_SYNC ? "sync msgout" :
					  nego == NS_WIDE ? "wide msgout" :
					  "ppr msgout", msgptr);
		}
	}

	return msglen;
}

/*
 *  Insert a job into the start queue.
 */
void sym_put_start_queue(struct sym_hcb *np, struct sym_ccb *cp)
{
	u_short	qidx;

#ifdef SYM_CONF_IARB_SUPPORT
	/*
	 *  If the previously queued CCB is not yet done, 
	 *  set the IARB hint. The SCRIPTS will go with IARB 
	 *  for this job when starting the previous one.
	 *  We leave devices a chance to win arbitration by 
	 *  not using more than 'iarb_max' consecutive 
	 *  immediate arbitrations.
	 */
	if (np->last_cp && np->iarb_count < np->iarb_max) {
		np->last_cp->host_flags |= HF_HINT_IARB;
		++np->iarb_count;
	}
	else
		np->iarb_count = 0;
	np->last_cp = cp;
#endif

#if   SYM_CONF_DMA_ADDRESSING_MODE == 2
	/*
	 *  Make SCRIPTS aware of the 64 bit DMA 
	 *  segment registers not being up-to-date.
	 */
	if (np->dmap_dirty)
		cp->host_xflags |= HX_DMAP_DIRTY;
#endif

	/*
	 *  Insert first the idle task and then our job.
	 *  The MBs should ensure proper ordering.
	 */
	qidx = np->squeueput + 2;
	if (qidx >= MAX_QUEUE*2) qidx = 0;

	np->squeue [qidx]	   = cpu_to_scr(np->idletask_ba);
	MEMORY_WRITE_BARRIER();
	np->squeue [np->squeueput] = cpu_to_scr(cp->ccb_ba);

	np->squeueput = qidx;

	if (DEBUG_FLAGS & DEBUG_QUEUE)
		scmd_printk(KERN_DEBUG, cp->cmd, "queuepos=%d\n",
							np->squeueput);

	/*
	 *  Script processor may be waiting for reselect.
	 *  Wake it up.
	 */
	MEMORY_WRITE_BARRIER();
	OUTB(np, nc_istat, SIGP|np->istat_sem);
}

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
/*
 *  Start next ready-to-start CCBs.
 */
void sym_start_next_ccbs(struct sym_hcb *np, struct sym_lcb *lp, int maxn)
{
	SYM_QUEHEAD *qp;
	struct sym_ccb *cp;

	/* 
	 *  Paranoia, as usual. :-)
	 */
	assert(!lp->started_tags || !lp->started_no_tag);

	/*
	 *  Try to start as many commands as asked by caller.
	 *  Prevent from having both tagged and untagged 
	 *  commands queued to the device at the same time.
	 */
	while (maxn--) {
		qp = sym_remque_head(&lp->waiting_ccbq);
		if (!qp)
			break;
		cp = sym_que_entry(qp, struct sym_ccb, link2_ccbq);
		if (cp->tag != NO_TAG) {
			if (lp->started_no_tag ||
			    lp->started_tags >= lp->started_max) {
				sym_insque_head(qp, &lp->waiting_ccbq);
				break;
			}
			lp->itlq_tbl[cp->tag] = cpu_to_scr(cp->ccb_ba);
			lp->head.resel_sa =
				cpu_to_scr(SCRIPTA_BA(np, resel_tag));
			++lp->started_tags;
		} else {
			if (lp->started_no_tag || lp->started_tags) {
				sym_insque_head(qp, &lp->waiting_ccbq);
				break;
			}
			lp->head.itl_task_sa = cpu_to_scr(cp->ccb_ba);
			lp->head.resel_sa =
			      cpu_to_scr(SCRIPTA_BA(np, resel_no_tag));
			++lp->started_no_tag;
		}
		cp->started = 1;
		sym_insque_tail(qp, &lp->started_ccbq);
		sym_put_start_queue(np, cp);
	}
}
#endif /* SYM_OPT_HANDLE_DEVICE_QUEUEING */

/*
 *  The chip may have completed jobs. Look at the DONE QUEUE.
 *
 *  On paper, memory read barriers may be needed here to 
 *  prevent out of order LOADs by the CPU from having 
 *  prefetched stale data prior to DMA having occurred.
 */
static int sym_wakeup_done (struct sym_hcb *np)
{
	struct sym_ccb *cp;
	int i, n;
	u32 dsa;

	n = 0;
	i = np->dqueueget;

	/* MEMORY_READ_BARRIER(); */
	while (1) {
		dsa = scr_to_cpu(np->dqueue[i]);
		if (!dsa)
			break;
		np->dqueue[i] = 0;
		if ((i = i+2) >= MAX_QUEUE*2)
			i = 0;

		cp = sym_ccb_from_dsa(np, dsa);
		if (cp) {
			MEMORY_READ_BARRIER();
			sym_complete_ok (np, cp);
			++n;
		}
		else
			printf ("%s: bad DSA (%x) in done queue.\n",
				sym_name(np), (u_int) dsa);
	}
	np->dqueueget = i;

	return n;
}

/*
 *  Complete all CCBs queued to the COMP queue.
 *
 *  These CCBs are assumed:
 *  - Not to be referenced either by devices or 
 *    SCRIPTS-related queues and datas.
 *  - To have to be completed with an error condition 
 *    or requeued.
 *
 *  The device queue freeze count is incremented 
 *  for each CCB that does not prevent this.
 *  This function is called when all CCBs involved 
 *  in error handling/recovery have been reaped.
 */
static void sym_flush_comp_queue(struct sym_hcb *np, int cam_status)
{
	SYM_QUEHEAD *qp;
	struct sym_ccb *cp;

	while ((qp = sym_remque_head(&np->comp_ccbq)) != NULL) {
		struct scsi_cmnd *cmd;
		cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
		sym_insque_tail(&cp->link_ccbq, &np->busy_ccbq);
		/* Leave quiet CCBs waiting for resources */
		if (cp->host_status == HS_WAIT)
			continue;
		cmd = cp->cmd;
		if (cam_status)
			sym_set_cam_status(cmd, cam_status);
#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
		if (sym_get_cam_status(cmd) == DID_SOFT_ERROR) {
			struct sym_tcb *tp = &np->target[cp->target];
			struct sym_lcb *lp = sym_lp(tp, cp->lun);
			if (lp) {
				sym_remque(&cp->link2_ccbq);
				sym_insque_tail(&cp->link2_ccbq,
				                &lp->waiting_ccbq);
				if (cp->started) {
					if (cp->tag != NO_TAG)
						--lp->started_tags;
					else
						--lp->started_no_tag;
				}
			}
			cp->started = 0;
			continue;
		}
#endif
		sym_free_ccb(np, cp);
		sym_xpt_done(np, cmd);
	}
}

/*
 *  Complete all active CCBs with error.
 *  Used on CHIP/SCSI RESET.
 */
static void sym_flush_busy_queue (struct sym_hcb *np, int cam_status)
{
	/*
	 *  Move all active CCBs to the COMP queue 
	 *  and flush this queue.
	 */
	sym_que_splice(&np->busy_ccbq, &np->comp_ccbq);
	sym_que_init(&np->busy_ccbq);
	sym_flush_comp_queue(np, cam_status);
}

/*
 *  Start chip.
 *
 *  'reason' means:
 *     0: initialisation.
 *     1: SCSI BUS RESET delivered or received.
 *     2: SCSI BUS MODE changed.
 */
void sym_start_up(struct Scsi_Host *shost, int reason)
{
	struct sym_data *sym_data = shost_priv(shost);
	struct pci_dev *pdev = sym_data->pdev;
	struct sym_hcb *np = sym_data->ncb;
 	int	i;
	u32	phys;

 	/*
	 *  Reset chip if asked, otherwise just clear fifos.
 	 */
	if (reason == 1)
		sym_soft_reset(np);
	else {
		OUTB(np, nc_stest3, TE|CSF);
		OUTONB(np, nc_ctest3, CLF);
	}
 
	/*
	 *  Clear Start Queue
	 */
	phys = np->squeue_ba;
	for (i = 0; i < MAX_QUEUE*2; i += 2) {
		np->squeue[i]   = cpu_to_scr(np->idletask_ba);
		np->squeue[i+1] = cpu_to_scr(phys + (i+2)*4);
	}
	np->squeue[MAX_QUEUE*2-1] = cpu_to_scr(phys);

	/*
	 *  Start at first entry.
	 */
	np->squeueput = 0;

	/*
	 *  Clear Done Queue
	 */
	phys = np->dqueue_ba;
	for (i = 0; i < MAX_QUEUE*2; i += 2) {
		np->dqueue[i]   = 0;
		np->dqueue[i+1] = cpu_to_scr(phys + (i+2)*4);
	}
	np->dqueue[MAX_QUEUE*2-1] = cpu_to_scr(phys);

	/*
	 *  Start at first entry.
	 */
	np->dqueueget = 0;

	/*
	 *  Install patches in scripts.
	 *  This also let point to first position the start 
	 *  and done queue pointers used from SCRIPTS.
	 */
	np->fw_patch(shost);

	/*
	 *  Wakeup all pending jobs.
	 */
	sym_flush_busy_queue(np, DID_RESET);

	/*
	 *  Init chip.
	 */
	OUTB(np, nc_istat,  0x00);			/*  Remove Reset, abort */
	INB(np, nc_mbox1);
	udelay(2000); /* The 895 needs time for the bus mode to settle */

	OUTB(np, nc_scntl0, np->rv_scntl0 | 0xc0);
					/*  full arb., ena parity, par->ATN  */
	OUTB(np, nc_scntl1, 0x00);		/*  odd parity, and remove CRST!! */

	sym_selectclock(np, np->rv_scntl3);	/* Select SCSI clock */

	OUTB(np, nc_scid  , RRE|np->myaddr);	/* Adapter SCSI address */
	OUTW(np, nc_respid, 1ul<<np->myaddr);	/* Id to respond to */
	OUTB(np, nc_istat , SIGP	);		/*  Signal Process */
	OUTB(np, nc_dmode , np->rv_dmode);		/* Burst length, dma mode */
	OUTB(np, nc_ctest5, np->rv_ctest5);	/* Large fifo + large burst */

	OUTB(np, nc_dcntl , NOCOM|np->rv_dcntl);	/* Protect SFBR */
	OUTB(np, nc_ctest3, np->rv_ctest3);	/* Write and invalidate */
	OUTB(np, nc_ctest4, np->rv_ctest4);	/* Master parity checking */

	/* Extended Sreq/Sack filtering not supported on the C10 */
	if (np->features & FE_C10)
		OUTB(np, nc_stest2, np->rv_stest2);
	else
		OUTB(np, nc_stest2, EXT|np->rv_stest2);

	OUTB(np, nc_stest3, TE);			/* TolerANT enable */
	OUTB(np, nc_stime0, 0x0c);			/* HTH disabled  STO 0.25 sec */

	/*
	 *  For now, disable AIP generation on C1010-66.
	 */
	if (pdev->device == PCI_DEVICE_ID_LSI_53C1010_66)
		OUTB(np, nc_aipcntl1, DISAIP);

	/*
	 *  C10101 rev. 0 errata.
	 *  Errant SGE's when in narrow. Write bits 4 & 5 of
	 *  STEST1 register to disable SGE. We probably should do 
	 *  that from SCRIPTS for each selection/reselection, but 
	 *  I just don't want. :)
	 */
	if (pdev->device == PCI_DEVICE_ID_LSI_53C1010_33 &&
	    pdev->revision < 1)
		OUTB(np, nc_stest1, INB(np, nc_stest1) | 0x30);

	/*
	 *  DEL 441 - 53C876 Rev 5 - Part Number 609-0392787/2788 - ITEM 2.
	 *  Disable overlapped arbitration for some dual function devices, 
	 *  regardless revision id (kind of post-chip-design feature. ;-))
	 */
	if (pdev->device == PCI_DEVICE_ID_NCR_53C875)
		OUTB(np, nc_ctest0, (1<<5));
	else if (pdev->device == PCI_DEVICE_ID_NCR_53C896)
		np->rv_ccntl0 |= DPR;

	/*
	 *  Write CCNTL0/CCNTL1 for chips capable of 64 bit addressing 
	 *  and/or hardware phase mismatch, since only such chips 
	 *  seem to support those IO registers.
	 */
	if (np->features & (FE_DAC|FE_NOPM)) {
		OUTB(np, nc_ccntl0, np->rv_ccntl0);
		OUTB(np, nc_ccntl1, np->rv_ccntl1);
	}

#if	SYM_CONF_DMA_ADDRESSING_MODE == 2
	/*
	 *  Set up scratch C and DRS IO registers to map the 32 bit 
	 *  DMA address range our data structures are located in.
	 */
	if (use_dac(np)) {
		np->dmap_bah[0] = 0;	/* ??? */
		OUTL(np, nc_scrx[0], np->dmap_bah[0]);
		OUTL(np, nc_drs, np->dmap_bah[0]);
	}
#endif

	/*
	 *  If phase mismatch handled by scripts (895A/896/1010),
	 *  set PM jump addresses.
	 */
	if (np->features & FE_NOPM) {
		OUTL(np, nc_pmjad1, SCRIPTB_BA(np, pm_handle));
		OUTL(np, nc_pmjad2, SCRIPTB_BA(np, pm_handle));
	}

	/*
	 *    Enable GPIO0 pin for writing if LED support from SCRIPTS.
	 *    Also set GPIO5 and clear GPIO6 if hardware LED control.
	 */
	if (np->features & FE_LED0)
		OUTB(np, nc_gpcntl, INB(np, nc_gpcntl) & ~0x01);
	else if (np->features & FE_LEDC)
		OUTB(np, nc_gpcntl, (INB(np, nc_gpcntl) & ~0x41) | 0x20);

	/*
	 *      enable ints
	 */
	OUTW(np, nc_sien , STO|HTH|MA|SGE|UDC|RST|PAR);
	OUTB(np, nc_dien , MDPE|BF|SSI|SIR|IID);

	/*
	 *  For 895/6 enable SBMC interrupt and save current SCSI bus mode.
	 *  Try to eat the spurious SBMC interrupt that may occur when 
	 *  we reset the chip but not the SCSI BUS (at initialization).
	 */
	if (np->features & (FE_ULTRA2|FE_ULTRA3)) {
		OUTONW(np, nc_sien, SBMC);
		if (reason == 0) {
			INB(np, nc_mbox1);
			mdelay(100);
			INW(np, nc_sist);
		}
		np->scsi_mode = INB(np, nc_stest4) & SMODE;
	}

	/*
	 *  Fill in target structure.
	 *  Reinitialize usrsync.
	 *  Reinitialize usrwide.
	 *  Prepare sync negotiation according to actual SCSI bus mode.
	 */
	for (i=0;i<SYM_CONF_MAX_TARGET;i++) {
		struct sym_tcb *tp = &np->target[i];

		tp->to_reset  = 0;
		tp->head.sval = 0;
		tp->head.wval = np->rv_scntl3;
		tp->head.uval = 0;
		if (tp->lun0p)
			tp->lun0p->to_clear = 0;
		if (tp->lunmp) {
			int ln;

			for (ln = 1; ln < SYM_CONF_MAX_LUN; ln++)
				if (tp->lunmp[ln])
					tp->lunmp[ln]->to_clear = 0;
		}
	}

	/*
	 *  Download SCSI SCRIPTS to on-chip RAM if present,
	 *  and start script processor.
	 *  We do the download preferently from the CPU.
	 *  For platforms that may not support PCI memory mapping,
	 *  we use simple SCRIPTS that performs MEMORY MOVEs.
	 */
	phys = SCRIPTA_BA(np, init);
	if (np->ram_ba) {
		if (sym_verbose >= 2)
			printf("%s: Downloading SCSI SCRIPTS.\n", sym_name(np));
		memcpy_toio(np->s.ramaddr, np->scripta0, np->scripta_sz);
		if (np->features & FE_RAM8K) {
			memcpy_toio(np->s.ramaddr + 4096, np->scriptb0, np->scriptb_sz);
			phys = scr_to_cpu(np->scr_ram_seg);
			OUTL(np, nc_mmws, phys);
			OUTL(np, nc_mmrs, phys);
			OUTL(np, nc_sfs,  phys);
			phys = SCRIPTB_BA(np, start64);
		}
	}

	np->istat_sem = 0;

	OUTL(np, nc_dsa, np->hcb_ba);
	OUTL_DSP(np, phys);

	/*
	 *  Notify the XPT about the RESET condition.
	 */
	if (reason != 0)
		sym_xpt_async_bus_reset(np);
}

/*
 *  Switch trans mode for current job and its target.
 */
static void sym_settrans(struct sym_hcb *np, int target, u_char opts, u_char ofs,
			 u_char per, u_char wide, u_char div, u_char fak)
{
	SYM_QUEHEAD *qp;
	u_char sval, wval, uval;
	struct sym_tcb *tp = &np->target[target];

	assert(target == (INB(np, nc_sdid) & 0x0f));

	sval = tp->head.sval;
	wval = tp->head.wval;
	uval = tp->head.uval;

#if 0
	printf("XXXX sval=%x wval=%x uval=%x (%x)\n", 
		sval, wval, uval, np->rv_scntl3);
#endif
	/*
	 *  Set the offset.
	 */
	if (!(np->features & FE_C10))
		sval = (sval & ~0x1f) | ofs;
	else
		sval = (sval & ~0x3f) | ofs;

	/*
	 *  Set the sync divisor and extra clock factor.
	 */
	if (ofs != 0) {
		wval = (wval & ~0x70) | ((div+1) << 4);
		if (!(np->features & FE_C10))
			sval = (sval & ~0xe0) | (fak << 5);
		else {
			uval = uval & ~(XCLKH_ST|XCLKH_DT|XCLKS_ST|XCLKS_DT);
			if (fak >= 1) uval |= (XCLKH_ST|XCLKH_DT);
			if (fak >= 2) uval |= (XCLKS_ST|XCLKS_DT);
		}
	}

	/*
	 *  Set the bus width.
	 */
	wval = wval & ~EWS;
	if (wide != 0)
		wval |= EWS;

	/*
	 *  Set misc. ultra enable bits.
	 */
	if (np->features & FE_C10) {
		uval = uval & ~(U3EN|AIPCKEN);
		if (opts)	{
			assert(np->features & FE_U3EN);
			uval |= U3EN;
		}
	} else {
		wval = wval & ~ULTRA;
		if (per <= 12)	wval |= ULTRA;
	}

	/*
	 *   Stop there if sync parameters are unchanged.
	 */
	if (tp->head.sval == sval && 
	    tp->head.wval == wval &&
	    tp->head.uval == uval)
		return;
	tp->head.sval = sval;
	tp->head.wval = wval;
	tp->head.uval = uval;

	/*
	 *  Disable extended Sreq/Sack filtering if per < 50.
	 *  Not supported on the C1010.
	 */
	if (per < 50 && !(np->features & FE_C10))
		OUTOFFB(np, nc_stest2, EXT);

	/*
	 *  set actual value and sync_status
	 */
	OUTB(np, nc_sxfer,  tp->head.sval);
	OUTB(np, nc_scntl3, tp->head.wval);

	if (np->features & FE_C10) {
		OUTB(np, nc_scntl4, tp->head.uval);
	}

	/*
	 *  patch ALL busy ccbs of this target.
	 */
	FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
		struct sym_ccb *cp;
		cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
		if (cp->target != target)
			continue;
		cp->phys.select.sel_scntl3 = tp->head.wval;
		cp->phys.select.sel_sxfer  = tp->head.sval;
		if (np->features & FE_C10) {
			cp->phys.select.sel_scntl4 = tp->head.uval;
		}
	}
}

static void sym_announce_transfer_rate(struct sym_tcb *tp)
{
	struct scsi_target *starget = tp->starget;

	if (tp->tprint.period != spi_period(starget) ||
	    tp->tprint.offset != spi_offset(starget) ||
	    tp->tprint.width != spi_width(starget) ||
	    tp->tprint.iu != spi_iu(starget) ||
	    tp->tprint.dt != spi_dt(starget) ||
	    tp->tprint.qas != spi_qas(starget) ||
	    !tp->tprint.check_nego) {
		tp->tprint.period = spi_period(starget);
		tp->tprint.offset = spi_offset(starget);
		tp->tprint.width = spi_width(starget);
		tp->tprint.iu = spi_iu(starget);
		tp->tprint.dt = spi_dt(starget);
		tp->tprint.qas = spi_qas(starget);
		tp->tprint.check_nego = 1;

		spi_display_xfer_agreement(starget);
	}
}

/*
 *  We received a WDTR.
 *  Let everything be aware of the changes.
 */
static void sym_setwide(struct sym_hcb *np, int target, u_char wide)
{
	struct sym_tcb *tp = &np->target[target];
	struct scsi_target *starget = tp->starget;

	sym_settrans(np, target, 0, 0, 0, wide, 0, 0);

	if (wide)
		tp->tgoal.renego = NS_WIDE;
	else
		tp->tgoal.renego = 0;
	tp->tgoal.check_nego = 0;
	tp->tgoal.width = wide;
	spi_offset(starget) = 0;
	spi_period(starget) = 0;
	spi_width(starget) = wide;
	spi_iu(starget) = 0;
	spi_dt(starget) = 0;
	spi_qas(starget) = 0;

	if (sym_verbose >= 3)
		sym_announce_transfer_rate(tp);
}

/*
 *  We received a SDTR.
 *  Let everything be aware of the changes.
 */
static void
sym_setsync(struct sym_hcb *np, int target,
            u_char ofs, u_char per, u_char div, u_char fak)
{
	struct sym_tcb *tp = &np->target[target];
	struct scsi_target *starget = tp->starget;
	u_char wide = (tp->head.wval & EWS) ? BUS_16_BIT : BUS_8_BIT;

	sym_settrans(np, target, 0, ofs, per, wide, div, fak);

	if (wide)
		tp->tgoal.renego = NS_WIDE;
	else if (ofs)
		tp->tgoal.renego = NS_SYNC;
	else
		tp->tgoal.renego = 0;
	spi_period(starget) = per;
	spi_offset(starget) = ofs;
	spi_iu(starget) = spi_dt(starget) = spi_qas(starget) = 0;

	if (!tp->tgoal.dt && !tp->tgoal.iu && !tp->tgoal.qas) {
		tp->tgoal.period = per;
		tp->tgoal.offset = ofs;
		tp->tgoal.check_nego = 0;
	}

	sym_announce_transfer_rate(tp);
}

/*
 *  We received a PPR.
 *  Let everything be aware of the changes.
 */
static void 
sym_setpprot(struct sym_hcb *np, int target, u_char opts, u_char ofs,
             u_char per, u_char wide, u_char div, u_char fak)
{
	struct sym_tcb *tp = &np->target[target];
	struct scsi_target *starget = tp->starget;

	sym_settrans(np, target, opts, ofs, per, wide, div, fak);

	if (wide || ofs)
		tp->tgoal.renego = NS_PPR;
	else
		tp->tgoal.renego = 0;
	spi_width(starget) = tp->tgoal.width = wide;
	spi_period(starget) = tp->tgoal.period = per;
	spi_offset(starget) = tp->tgoal.offset = ofs;
	spi_iu(starget) = tp->tgoal.iu = !!(opts & PPR_OPT_IU);
	spi_dt(starget) = tp->tgoal.dt = !!(opts & PPR_OPT_DT);
	spi_qas(starget) = tp->tgoal.qas = !!(opts & PPR_OPT_QAS);
	tp->tgoal.check_nego = 0;

	sym_announce_transfer_rate(tp);
}

/*
 *  generic recovery from scsi interrupt
 *
 *  The doc says that when the chip gets an SCSI interrupt,
 *  it tries to stop in an orderly fashion, by completing 
 *  an instruction fetch that had started or by flushing 
 *  the DMA fifo for a write to memory that was executing.
 *  Such a fashion is not enough to know if the instruction 
 *  that was just before the current DSP value has been 
 *  executed or not.
 *
 *  There are some small SCRIPTS sections that deal with 
 *  the start queue and the done queue that may break any 
 *  assomption from the C code if we are interrupted 
 *  inside, so we reset if this happens. Btw, since these 
 *  SCRIPTS sections are executed while the SCRIPTS hasn't 
 *  started SCSI operations, it is very unlikely to happen.
 *
 *  All the driver data structures are supposed to be 
 *  allocated from the same 4 GB memory window, so there 
 *  is a 1 to 1 relationship between DSA and driver data 
 *  structures. Since we are careful :) to invalidate the 
 *  DSA when we complete a command or when the SCRIPTS 
 *  pushes a DSA into a queue, we can trust it when it 
 *  points to a CCB.
 */
static void sym_recover_scsi_int (struct sym_hcb *np, u_char hsts)
{
	u32	dsp	= INL(np, nc_dsp);
	u32	dsa	= INL(np, nc_dsa);
	struct sym_ccb *cp	= sym_ccb_from_dsa(np, dsa);

	/*
	 *  If we haven't been interrupted inside the SCRIPTS 
	 *  critical pathes, we can safely restart the SCRIPTS 
	 *  and trust the DSA value if it matches a CCB.
	 */
	if ((!(dsp > SCRIPTA_BA(np, getjob_begin) &&
	       dsp < SCRIPTA_BA(np, getjob_end) + 1)) &&
	    (!(dsp > SCRIPTA_BA(np, ungetjob) &&
	       dsp < SCRIPTA_BA(np, reselect) + 1)) &&
	    (!(dsp > SCRIPTB_BA(np, sel_for_abort) &&
	       dsp < SCRIPTB_BA(np, sel_for_abort_1) + 1)) &&
	    (!(dsp > SCRIPTA_BA(np, done) &&
	       dsp < SCRIPTA_BA(np, done_end) + 1))) {
		OUTB(np, nc_ctest3, np->rv_ctest3 | CLF); /* clear dma fifo  */
		OUTB(np, nc_stest3, TE|CSF);		/* clear scsi fifo */
		/*
		 *  If we have a CCB, let the SCRIPTS call us back for 
		 *  the handling of the error with SCRATCHA filled with 
		 *  STARTPOS. This way, we will be able to freeze the 
		 *  device queue and requeue awaiting IOs.
		 */
		if (cp) {
			cp->host_status = hsts;
			OUTL_DSP(np, SCRIPTA_BA(np, complete_error));
		}
		/*
		 *  Otherwise just restart the SCRIPTS.
		 */
		else {
			OUTL(np, nc_dsa, 0xffffff);
			OUTL_DSP(np, SCRIPTA_BA(np, start));
		}
	}
	else
		goto reset_all;

	return;

reset_all:
	sym_start_reset(np);
}

/*
 *  chip exception handler for selection timeout
 */
static void sym_int_sto (struct sym_hcb *np)
{
	u32 dsp	= INL(np, nc_dsp);

	if (DEBUG_FLAGS & DEBUG_TINY) printf ("T");

	if (dsp == SCRIPTA_BA(np, wf_sel_done) + 8)
		sym_recover_scsi_int(np, HS_SEL_TIMEOUT);
	else
		sym_start_reset(np);
}

/*
 *  chip exception handler for unexpected disconnect
 */
static void sym_int_udc (struct sym_hcb *np)
{
	printf ("%s: unexpected disconnect\n", sym_name(np));
	sym_recover_scsi_int(np, HS_UNEXPECTED);
}

/*
 *  chip exception handler for SCSI bus mode change
 *
 *  spi2-r12 11.2.3 says a transceiver mode change must 
 *  generate a reset event and a device that detects a reset 
 *  event shall initiate a hard reset. It says also that a
 *  device that detects a mode change shall set data transfer 
 *  mode to eight bit asynchronous, etc...
 *  So, just reinitializing all except chip should be enough.
 */
static void sym_int_sbmc(struct Scsi_Host *shost)
{
	struct sym_hcb *np = sym_get_hcb(shost);
	u_char scsi_mode = INB(np, nc_stest4) & SMODE;

	/*
	 *  Notify user.
	 */
	printf("%s: SCSI BUS mode change from %s to %s.\n", sym_name(np),
		sym_scsi_bus_mode(np->scsi_mode), sym_scsi_bus_mode(scsi_mode));

	/*
	 *  Should suspend command processing for a few seconds and 
	 *  reinitialize all except the chip.
	 */
	sym_start_up(shost, 2);
}

/*
 *  chip exception handler for SCSI parity error.
 *
 *  When the chip detects a SCSI parity error and is 
 *  currently executing a (CH)MOV instruction, it does 
 *  not interrupt immediately, but tries to finish the 
 *  transfer of the current scatter entry before 
 *  interrupting. The following situations may occur:
 *
 *  - The complete scatter entry has been transferred 
 *    without the device having changed phase.
 *    The chip will then interrupt with the DSP pointing 
 *    to the instruction that follows the MOV.
 *
 *  - A phase mismatch occurs before the MOV finished 
 *    and phase errors are to be handled by the C code.
 *    The chip will then interrupt with both PAR and MA 
 *    conditions set.
 *
 *  - A phase mismatch occurs before the MOV finished and 
 *    phase errors are to be handled by SCRIPTS.
 *    The chip will load the DSP with the phase mismatch 
 *    JUMP address and interrupt the host processor.
 */
static void sym_int_par (struct sym_hcb *np, u_short sist)
{
	u_char	hsts	= INB(np, HS_PRT);
	u32	dsp	= INL(np, nc_dsp);
	u32	dbc	= INL(np, nc_dbc);
	u32	dsa	= INL(np, nc_dsa);
	u_char	sbcl	= INB(np, nc_sbcl);
	u_char	cmd	= dbc >> 24;
	int phase	= cmd & 7;
	struct sym_ccb *cp	= sym_ccb_from_dsa(np, dsa);

	if (printk_ratelimit())
		printf("%s: SCSI parity error detected: SCR1=%d DBC=%x SBCL=%x\n",
			sym_name(np), hsts, dbc, sbcl);

	/*
	 *  Check that the chip is connected to the SCSI BUS.
	 */
	if (!(INB(np, nc_scntl1) & ISCON)) {
		sym_recover_scsi_int(np, HS_UNEXPECTED);
		return;
	}

	/*
	 *  If the nexus is not clearly identified, reset the bus.
	 *  We will try to do better later.
	 */
	if (!cp)
		goto reset_all;

	/*
	 *  Check instruction was a MOV, direction was INPUT and 
	 *  ATN is asserted.
	 */
	if ((cmd & 0xc0) || !(phase & 1) || !(sbcl & 0x8))
		goto reset_all;

	/*
	 *  Keep track of the parity error.
	 */
	OUTONB(np, HF_PRT, HF_EXT_ERR);
	cp->xerr_status |= XE_PARITY_ERR;

	/*
	 *  Prepare the message to send to the device.
	 */
	np->msgout[0] = (phase == 7) ? M_PARITY : M_ID_ERROR;

	/*
	 *  If the old phase was DATA IN phase, we have to deal with
	 *  the 3 situations described above.
	 *  For other input phases (MSG IN and STATUS), the device 
	 *  must resend the whole thing that failed parity checking 
	 *  or signal error. So, jumping to dispatcher should be OK.
	 */
	if (phase == 1 || phase == 5) {
		/* Phase mismatch handled by SCRIPTS */
		if (dsp == SCRIPTB_BA(np, pm_handle))
			OUTL_DSP(np, dsp);
		/* Phase mismatch handled by the C code */
		else if (sist & MA)
			sym_int_ma (np);
		/* No phase mismatch occurred */
		else {
			sym_set_script_dp (np, cp, dsp);
			OUTL_DSP(np, SCRIPTA_BA(np, dispatch));
		}
	}
	else if (phase == 7)	/* We definitely cannot handle parity errors */
#if 1				/* in message-in phase due to the relection  */
		goto reset_all; /* path and various message anticipations.   */
#else
		OUTL_DSP(np, SCRIPTA_BA(np, clrack));
#endif
	else
		OUTL_DSP(np, SCRIPTA_BA(np, dispatch));
	return;

reset_all:
	sym_start_reset(np);
	return;
}

/*
 *  chip exception handler for phase errors.
 *
 *  We have to construct a new transfer descriptor,
 *  to transfer the rest of the current block.
 */
static void sym_int_ma (struct sym_hcb *np)
{
	u32	dbc;
	u32	rest;
	u32	dsp;
	u32	dsa;
	u32	nxtdsp;
	u32	*vdsp;
	u32	oadr, olen;
	u32	*tblp;
        u32	newcmd;
	u_int	delta;
	u_char	cmd;
	u_char	hflags, hflags0;
	struct	sym_pmc *pm;
	struct sym_ccb *cp;

	dsp	= INL(np, nc_dsp);
	dbc	= INL(np, nc_dbc);
	dsa	= INL(np, nc_dsa);

	cmd	= dbc >> 24;
	rest	= dbc & 0xffffff;
	delta	= 0;

	/*
	 *  locate matching cp if any.
	 */
	cp = sym_ccb_from_dsa(np, dsa);

	/*
	 *  Donnot take into account dma fifo and various buffers in 
	 *  INPUT phase since the chip flushes everything before 
	 *  raising the MA interrupt for interrupted INPUT phases.
	 *  For DATA IN phase, we will check for the SWIDE later.
	 */
	if ((cmd & 7) != 1 && (cmd & 7) != 5) {
		u_char ss0, ss2;

		if (np->features & FE_DFBC)
			delta = INW(np, nc_dfbc);
		else {
			u32 dfifo;

			/*
			 * Read DFIFO, CTEST[4-6] using 1 PCI bus ownership.
			 */
			dfifo = INL(np, nc_dfifo);

			/*
			 *  Calculate remaining bytes in DMA fifo.
			 *  (CTEST5 = dfifo >> 16)
			 */
			if (dfifo & (DFS << 16))
				delta = ((((dfifo >> 8) & 0x300) |
				          (dfifo & 0xff)) - rest) & 0x3ff;
			else
				delta = ((dfifo & 0xff) - rest) & 0x7f;
		}

		/*
		 *  The data in the dma fifo has not been transferred to
		 *  the target -> add the amount to the rest
		 *  and clear the data.
		 *  Check the sstat2 register in case of wide transfer.
		 */
		rest += delta;
		ss0  = INB(np, nc_sstat0);
		if (ss0 & OLF) rest++;
		if (!(np->features & FE_C10))
			if (ss0 & ORF) rest++;
		if (cp && (cp->phys.select.sel_scntl3 & EWS)) {
			ss2 = INB(np, nc_sstat2);
			if (ss2 & OLF1) rest++;
			if (!(np->features & FE_C10))
				if (ss2 & ORF1) rest++;
		}

		/*
		 *  Clear fifos.
		 */
		OUTB(np, nc_ctest3, np->rv_ctest3 | CLF);	/* dma fifo  */
		OUTB(np, nc_stest3, TE|CSF);		/* scsi fifo */
	}

	/*
	 *  log the information
	 */
	if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
		printf ("P%x%x RL=%d D=%d ", cmd&7, INB(np, nc_sbcl)&7,
			(unsigned) rest, (unsigned) delta);

	/*
	 *  try to find the interrupted script command,
	 *  and the address at which to continue.
	 */
	vdsp	= NULL;
	nxtdsp	= 0;
	if	(dsp >  np->scripta_ba &&
		 dsp <= np->scripta_ba + np->scripta_sz) {
		vdsp = (u32 *)((char*)np->scripta0 + (dsp-np->scripta_ba-8));
		nxtdsp = dsp;
	}
	else if	(dsp >  np->scriptb_ba &&
		 dsp <= np->scriptb_ba + np->scriptb_sz) {
		vdsp = (u32 *)((char*)np->scriptb0 + (dsp-np->scriptb_ba-8));
		nxtdsp = dsp;
	}

	/*
	 *  log the information
	 */
	if (DEBUG_FLAGS & DEBUG_PHASE) {
		printf ("\nCP=%p DSP=%x NXT=%x VDSP=%p CMD=%x ",
			cp, (unsigned)dsp, (unsigned)nxtdsp, vdsp, cmd);
	}

	if (!vdsp) {
		printf ("%s: interrupted SCRIPT address not found.\n", 
			sym_name (np));
		goto reset_all;
	}

	if (!cp) {
		printf ("%s: SCSI phase error fixup: CCB already dequeued.\n", 
			sym_name (np));
		goto reset_all;
	}

	/*
	 *  get old startaddress and old length.
	 */
	oadr = scr_to_cpu(vdsp[1]);

	if (cmd & 0x10) {	/* Table indirect */
		tblp = (u32 *) ((char*) &cp->phys + oadr);
		olen = scr_to_cpu(tblp[0]);
		oadr = scr_to_cpu(tblp[1]);
	} else {
		tblp = (u32 *) 0;
		olen = scr_to_cpu(vdsp[0]) & 0xffffff;
	}

	if (DEBUG_FLAGS & DEBUG_PHASE) {
		printf ("OCMD=%x\nTBLP=%p OLEN=%x OADR=%x\n",
			(unsigned) (scr_to_cpu(vdsp[0]) >> 24),
			tblp,
			(unsigned) olen,
			(unsigned) oadr);
	}

	/*
	 *  check cmd against assumed interrupted script command.
	 *  If dt data phase, the MOVE instruction hasn't bit 4 of 
	 *  the phase.
	 */
	if (((cmd & 2) ? cmd : (cmd & ~4)) != (scr_to_cpu(vdsp[0]) >> 24)) {
		sym_print_addr(cp->cmd,
			"internal error: cmd=%02x != %02x=(vdsp[0] >> 24)\n",
			cmd, scr_to_cpu(vdsp[0]) >> 24);

		goto reset_all;
	}

	/*
	 *  if old phase not dataphase, leave here.
	 */
	if (cmd & 2) {
		sym_print_addr(cp->cmd,
			"phase change %x-%x %d@%08x resid=%d.\n",
			cmd&7, INB(np, nc_sbcl)&7, (unsigned)olen,
			(unsigned)oadr, (unsigned)rest);
		goto unexpected_phase;
	}

	/*
	 *  Choose the correct PM save area.
	 *
	 *  Look at the PM_SAVE SCRIPT if you want to understand 
	 *  this stuff. The equivalent code is implemented in 
	 *  SCRIPTS for the 895A, 896 and 1010 that are able to 
	 *  handle PM from the SCRIPTS processor.
	 */
	hflags0 = INB(np, HF_PRT);
	hflags = hflags0;

	if (hflags & (HF_IN_PM0 | HF_IN_PM1 | HF_DP_SAVED)) {
		if (hflags & HF_IN_PM0)
			nxtdsp = scr_to_cpu(cp->phys.pm0.ret);
		else if	(hflags & HF_IN_PM1)
			nxtdsp = scr_to_cpu(cp->phys.pm1.ret);

		if (hflags & HF_DP_SAVED)
			hflags ^= HF_ACT_PM;
	}

	if (!(hflags & HF_ACT_PM)) {
		pm = &cp->phys.pm0;
		newcmd = SCRIPTA_BA(np, pm0_data);
	}
	else {
		pm = &cp->phys.pm1;
		newcmd = SCRIPTA_BA(np, pm1_data);
	}

	hflags &= ~(HF_IN_PM0 | HF_IN_PM1 | HF_DP_SAVED);
	if (hflags != hflags0)
		OUTB(np, HF_PRT, hflags);

	/*
	 *  fillin the phase mismatch context
	 */
	pm->sg.addr = cpu_to_scr(oadr + olen - rest);
	pm->sg.size = cpu_to_scr(rest);
	pm->ret     = cpu_to_scr(nxtdsp);

	/*
	 *  If we have a SWIDE,
	 *  - prepare the address to write the SWIDE from SCRIPTS,
	 *  - compute the SCRIPTS address to restart from,
	 *  - move current data pointer context by one byte.
	 */
	nxtdsp = SCRIPTA_BA(np, dispatch);
	if ((cmd & 7) == 1 && cp && (cp->phys.select.sel_scntl3 & EWS) &&
	    (INB(np, nc_scntl2) & WSR)) {
		u32 tmp;

		/*
		 *  Set up the table indirect for the MOVE
		 *  of the residual byte and adjust the data 
		 *  pointer context.
		 */
		tmp = scr_to_cpu(pm->sg.addr);
		cp->phys.wresid.addr = cpu_to_scr(tmp);
		pm->sg.addr = cpu_to_scr(tmp + 1);
		tmp = scr_to_cpu(pm->sg.size);
		cp->phys.wresid.size = cpu_to_scr((tmp&0xff000000) | 1);
		pm->sg.size = cpu_to_scr(tmp - 1);

		/*
		 *  If only the residual byte is to be moved, 
		 *  no PM context is needed.
		 */
		if ((tmp&0xffffff) == 1)
			newcmd = pm->ret;

		/*
		 *  Prepare the address of SCRIPTS that will 
		 *  move the residual byte to memory.
		 */
		nxtdsp = SCRIPTB_BA(np, wsr_ma_helper);
	}

	if (DEBUG_FLAGS & DEBUG_PHASE) {
		sym_print_addr(cp->cmd, "PM %x %x %x / %x %x %x.\n",
			hflags0, hflags, newcmd,
			(unsigned)scr_to_cpu(pm->sg.addr),
			(unsigned)scr_to_cpu(pm->sg.size),
			(unsigned)scr_to_cpu(pm->ret));
	}

	/*
	 *  Restart the SCRIPTS processor.
	 */
	sym_set_script_dp (np, cp, newcmd);
	OUTL_DSP(np, nxtdsp);
	return;

	/*
	 *  Unexpected phase changes that occurs when the current phase 
	 *  is not a DATA IN or DATA OUT phase are due to error conditions.
	 *  Such event may only happen when the SCRIPTS is using a 
	 *  multibyte SCSI MOVE.
	 *
	 *  Phase change		Some possible cause
	 *
	 *  COMMAND  --> MSG IN	SCSI parity error detected by target.
	 *  COMMAND  --> STATUS	Bad command or refused by target.
	 *  MSG OUT  --> MSG IN     Message rejected by target.
	 *  MSG OUT  --> COMMAND    Bogus target that discards extended
	 *  			negotiation messages.
	 *
	 *  The code below does not care of the new phase and so 
	 *  trusts the target. Why to annoy it ?
	 *  If the interrupted phase is COMMAND phase, we restart at
	 *  dispatcher.
	 *  If a target does not get all the messages after selection, 
	 *  the code assumes blindly that the target discards extended 
	 *  messages and clears the negotiation status.
	 *  If the target does not want all our response to negotiation,
	 *  we force a SIR_NEGO_PROTO interrupt (it is a hack that avoids 
	 *  bloat for such a should_not_happen situation).
	 *  In all other situation, we reset the BUS.
	 *  Are these assumptions reasonable ? (Wait and see ...)
	 */
unexpected_phase:
	dsp -= 8;
	nxtdsp = 0;

	switch (cmd & 7) {
	case 2:	/* COMMAND phase */
		nxtdsp = SCRIPTA_BA(np, dispatch);
		break;
#if 0
	case 3:	/* STATUS  phase */
		nxtdsp = SCRIPTA_BA(np, dispatch);
		break;
#endif
	case 6:	/* MSG OUT phase */
		/*
		 *  If the device may want to use untagged when we want 
		 *  tagged, we prepare an IDENTIFY without disc. granted, 
		 *  since we will not be able to handle reselect.
		 *  Otherwise, we just don't care.
		 */
		if	(dsp == SCRIPTA_BA(np, send_ident)) {
			if (cp->tag != NO_TAG && olen - rest <= 3) {
				cp->host_status = HS_BUSY;
				np->msgout[0] = IDENTIFY(0, cp->lun);
				nxtdsp = SCRIPTB_BA(np, ident_break_atn);
			}
			else
				nxtdsp = SCRIPTB_BA(np, ident_break);
		}
		else if	(dsp == SCRIPTB_BA(np, send_wdtr) ||
			 dsp == SCRIPTB_BA(np, send_sdtr) ||
			 dsp == SCRIPTB_BA(np, send_ppr)) {
			nxtdsp = SCRIPTB_BA(np, nego_bad_phase);
			if (dsp == SCRIPTB_BA(np, send_ppr)) {
				struct scsi_device *dev = cp->cmd->device;
				dev->ppr = 0;
			}
		}
		break;
#if 0
	case 7:	/* MSG IN  phase */
		nxtdsp = SCRIPTA_BA(np, clrack);
		break;
#endif
	}

	if (nxtdsp) {
		OUTL_DSP(np, nxtdsp);
		return;
	}

reset_all:
	sym_start_reset(np);
}

/*
 *  chip interrupt handler
 *
 *  In normal situations, interrupt conditions occur one at 
 *  a time. But when something bad happens on the SCSI BUS, 
 *  the chip may raise several interrupt flags before 
 *  stopping and interrupting the CPU. The additionnal 
 *  interrupt flags are stacked in some extra registers 
 *  after the SIP and/or DIP flag has been raised in the 
 *  ISTAT. After the CPU has read the interrupt condition 
 *  flag from SIST or DSTAT, the chip unstacks the other 
 *  interrupt flags and sets the corresponding bits in 
 *  SIST or DSTAT. Since the chip starts stacking once the 
 *  SIP or DIP flag is set, there is a small window of time 
 *  where the stacking does not occur.
 *
 *  Typically, multiple interrupt conditions may happen in 
 *  the following situations:
 *
 *  - SCSI parity error + Phase mismatch  (PAR|MA)
 *    When an parity error is detected in input phase 
 *    and the device switches to msg-in phase inside a 
 *    block MOV.
 *  - SCSI parity error + Unexpected disconnect (PAR|UDC)
 *    When a stupid device does not want to handle the 
 *    recovery of an SCSI parity error.
 *  - Some combinations of STO, PAR, UDC, ...
 *    When using non compliant SCSI stuff, when user is 
 *    doing non compliant hot tampering on the BUS, when 
 *    something really bad happens to a device, etc ...
 *
 *  The heuristic suggested by SYMBIOS to handle 
 *  multiple interrupts is to try unstacking all 
 *  interrupts conditions and to handle them on some 
 *  priority based on error severity.
 *  This will work when the unstacking has been 
 *  successful, but we cannot be 100 % sure of that, 
 *  since the CPU may have been faster to unstack than 
 *  the chip is able to stack. Hmmm ... But it seems that 
 *  such a situation is very unlikely to happen.
 *
 *  If this happen, for example STO caught by the CPU 
 *  then UDC happenning before the CPU have restarted 
 *  the SCRIPTS, the driver may wrongly complete the 
 *  same command on UDC, since the SCRIPTS didn't restart 
 *  and the DSA still points to the same command.
 *  We avoid this situation by setting the DSA to an 
 *  invalid value when the CCB is completed and before 
 *  restarting the SCRIPTS.
 *
 *  Another issue is that we need some section of our 
 *  recovery procedures to be somehow uninterruptible but 
 *  the SCRIPTS processor does not provides such a 
 *  feature. For this reason, we handle recovery preferently 
 *  from the C code and check against some SCRIPTS critical 
 *  sections from the C code.
 *
 *  Hopefully, the interrupt handling of the driver is now 
 *  able to resist to weird BUS error conditions, but donnot 
 *  ask me for any guarantee that it will never fail. :-)
 *  Use at your own decision and risk.
 */

irqreturn_t sym_interrupt(struct Scsi_Host *shost)
{
	struct sym_data *sym_data = shost_priv(shost);
	struct sym_hcb *np = sym_data->ncb;
	struct pci_dev *pdev = sym_data->pdev;
	u_char	istat, istatc;
	u_char	dstat;
	u_short	sist;

	/*
	 *  interrupt on the fly ?
	 *  (SCRIPTS may still be running)
	 *
	 *  A `dummy read' is needed to ensure that the 
	 *  clear of the INTF flag reaches the device 
	 *  and that posted writes are flushed to memory
	 *  before the scanning of the DONE queue.
	 *  Note that SCRIPTS also (dummy) read to memory 
	 *  prior to deliver the INTF interrupt condition.
	 */
	istat = INB(np, nc_istat);
	if (istat & INTF) {
		OUTB(np, nc_istat, (istat & SIGP) | INTF | np->istat_sem);
		istat |= INB(np, nc_istat);		/* DUMMY READ */
		if (DEBUG_FLAGS & DEBUG_TINY) printf ("F ");
		sym_wakeup_done(np);
	}

	if (!(istat & (SIP|DIP)))
		return (istat & INTF) ? IRQ_HANDLED : IRQ_NONE;

#if 0	/* We should never get this one */
	if (istat & CABRT)
		OUTB(np, nc_istat, CABRT);
#endif

	/*
	 *  PAR and MA interrupts may occur at the same time,
	 *  and we need to know of both in order to handle 
	 *  this situation properly. We try to unstack SCSI 
	 *  interrupts for that reason. BTW, I dislike a LOT 
	 *  such a loop inside the interrupt routine.
	 *  Even if DMA interrupt stacking is very unlikely to 
	 *  happen, we also try unstacking these ones, since 
	 *  this has no performance impact.
	 */
	sist	= 0;
	dstat	= 0;
	istatc	= istat;
	do {
		if (istatc & SIP)
			sist  |= INW(np, nc_sist);
		if (istatc & DIP)
			dstat |= INB(np, nc_dstat);
		istatc = INB(np, nc_istat);
		istat |= istatc;

		/* Prevent deadlock waiting on a condition that may
		 * never clear. */
		if (unlikely(sist == 0xffff && dstat == 0xff)) {
			if (pci_channel_offline(pdev))
				return IRQ_NONE;
		}
	} while (istatc & (SIP|DIP));

	if (DEBUG_FLAGS & DEBUG_TINY)
		printf ("<%d|%x:%x|%x:%x>",
			(int)INB(np, nc_scr0),
			dstat,sist,
			(unsigned)INL(np, nc_dsp),
			(unsigned)INL(np, nc_dbc));
	/*
	 *  On paper, a memory read barrier may be needed here to 
	 *  prevent out of order LOADs by the CPU from having 
	 *  prefetched stale data prior to DMA having occurred.
	 *  And since we are paranoid ... :)
	 */
	MEMORY_READ_BARRIER();

	/*
	 *  First, interrupts we want to service cleanly.
	 *
	 *  Phase mismatch (MA) is the most frequent interrupt 
	 *  for chip earlier than the 896 and so we have to service 
	 *  it as quickly as possible.
	 *  A SCSI parity error (PAR) may be combined with a phase 
	 *  mismatch condition (MA).
	 *  Programmed interrupts (SIR) are used to call the C code 
	 *  from SCRIPTS.
	 *  The single step interrupt (SSI) is not used in this 
	 *  driver.
	 */
	if (!(sist  & (STO|GEN|HTH|SGE|UDC|SBMC|RST)) &&
	    !(dstat & (MDPE|BF|ABRT|IID))) {
		if	(sist & PAR)	sym_int_par (np, sist);
		else if (sist & MA)	sym_int_ma (np);
		else if (dstat & SIR)	sym_int_sir(np);
		else if (dstat & SSI)	OUTONB_STD();
		else			goto unknown_int;
		return IRQ_HANDLED;
	}

	/*
	 *  Now, interrupts that donnot happen in normal 
	 *  situations and that we may need to recover from.
	 *
	 *  On SCSI RESET (RST), we reset everything.
	 *  On SCSI BUS MODE CHANGE (SBMC), we complete all 
	 *  active CCBs with RESET status, prepare all devices 
	 *  for negotiating again and restart the SCRIPTS.
	 *  On STO and UDC, we complete the CCB with the corres- 
	 *  ponding status and restart the SCRIPTS.
	 */
	if (sist & RST) {
		printf("%s: SCSI BUS reset detected.\n", sym_name(np));
		sym_start_up(shost, 1);
		return IRQ_HANDLED;
	}

	OUTB(np, nc_ctest3, np->rv_ctest3 | CLF);	/* clear dma fifo  */
	OUTB(np, nc_stest3, TE|CSF);		/* clear scsi fifo */

	if (!(sist  & (GEN|HTH|SGE)) &&
	    !(dstat & (MDPE|BF|ABRT|IID))) {
		if	(sist & SBMC)	sym_int_sbmc(shost);
		else if (sist & STO)	sym_int_sto (np);
		else if (sist & UDC)	sym_int_udc (np);
		else			goto unknown_int;
		return IRQ_HANDLED;
	}

	/*
	 *  Now, interrupts we are not able to recover cleanly.
	 *
	 *  Log message for hard errors.
	 *  Reset everything.
	 */

	sym_log_hard_error(shost, sist, dstat);

	if ((sist & (GEN|HTH|SGE)) ||
		(dstat & (MDPE|BF|ABRT|IID))) {
		sym_start_reset(np);
		return IRQ_HANDLED;
	}

unknown_int:
	/*
	 *  We just miss the cause of the interrupt. :(
	 *  Print a message. The timeout will do the real work.
	 */
	printf(	"%s: unknown interrupt(s) ignored, "
		"ISTAT=0x%x DSTAT=0x%x SIST=0x%x\n",
		sym_name(np), istat, dstat, sist);
	return IRQ_NONE;
}

/*
 *  Dequeue from the START queue all CCBs that match 
 *  a given target/lun/task condition (-1 means all),
 *  and move them from the BUSY queue to the COMP queue 
 *  with DID_SOFT_ERROR status condition.
 *  This function is used during error handling/recovery.
 *  It is called with SCRIPTS not running.
 */
static int 
sym_dequeue_from_squeue(struct sym_hcb *np, int i, int target, int lun, int task)
{
	int j;
	struct sym_ccb *cp;

	/*
	 *  Make sure the starting index is within range.
	 */
	assert((i >= 0) && (i < 2*MAX_QUEUE));

	/*
	 *  Walk until end of START queue and dequeue every job 
	 *  that matches the target/lun/task condition.
	 */
	j = i;
	while (i != np->squeueput) {
		cp = sym_ccb_from_dsa(np, scr_to_cpu(np->squeue[i]));
		assert(cp);
#ifdef SYM_CONF_IARB_SUPPORT
		/* Forget hints for IARB, they may be no longer relevant */
		cp->host_flags &= ~HF_HINT_IARB;
#endif
		if ((target == -1 || cp->target == target) &&
		    (lun    == -1 || cp->lun    == lun)    &&
		    (task   == -1 || cp->tag    == task)) {
#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
			sym_set_cam_status(cp->cmd, DID_SOFT_ERROR);
#else
			sym_set_cam_status(cp->cmd, DID_REQUEUE);
#endif
			sym_remque(&cp->link_ccbq);
			sym_insque_tail(&cp->link_ccbq, &np->comp_ccbq);
		}
		else {
			if (i != j)
				np->squeue[j] = np->squeue[i];
			if ((j += 2) >= MAX_QUEUE*2) j = 0;
		}
		if ((i += 2) >= MAX_QUEUE*2) i = 0;
	}
	if (i != j)		/* Copy back the idle task if needed */
		np->squeue[j] = np->squeue[i];
	np->squeueput = j;	/* Update our current start queue pointer */

	return (i - j) / 2;
}

/*
 *  chip handler for bad SCSI status condition
 *
 *  In case of bad SCSI status, we unqueue all the tasks 
 *  currently queued to the controller but not yet started 
 *  and then restart the SCRIPTS processor immediately.
 *
 *  QUEUE FULL and BUSY conditions are handled the same way.
 *  Basically all the not yet started tasks are requeued in 
 *  device queue and the queue is frozen until a completion.
 *
 *  For CHECK CONDITION and COMMAND TERMINATED status, we use 
 *  the CCB of the failed command to prepare a REQUEST SENSE 
 *  SCSI command and queue it to the controller queue.
 *
 *  SCRATCHA is assumed to have been loaded with STARTPOS 
 *  before the SCRIPTS called the C code.
 */
static void sym_sir_bad_scsi_status(struct sym_hcb *np, int num, struct sym_ccb *cp)
{
	u32		startp;
	u_char		s_status = cp->ssss_status;
	u_char		h_flags  = cp->host_flags;
	int		msglen;
	int		i;

	/*
	 *  Compute the index of the next job to start from SCRIPTS.
	 */
	i = (INL(np, nc_scratcha) - np->squeue_ba) / 4;

	/*
	 *  The last CCB queued used for IARB hint may be 
	 *  no longer relevant. Forget it.
	 */
#ifdef SYM_CONF_IARB_SUPPORT
	if (np->last_cp)
		np->last_cp = 0;
#endif

	/*
	 *  Now deal with the SCSI status.
	 */
	switch(s_status) {
	case S_BUSY:
	case S_QUEUE_FULL:
		if (sym_verbose >= 2) {
			sym_print_addr(cp->cmd, "%s\n",
			        s_status == S_BUSY ? "BUSY" : "QUEUE FULL\n");
		}
		/* fall through */
	default:	/* S_INT, S_INT_COND_MET, S_CONFLICT */
		sym_complete_error (np, cp);
		break;
	case S_TERMINATED:
	case S_CHECK_COND:
		/*
		 *  If we get an SCSI error when requesting sense, give up.
		 */
		if (h_flags & HF_SENSE) {
			sym_complete_error (np, cp);
			break;
		}

		/*
		 *  Dequeue all queued CCBs for that device not yet started,
		 *  and restart the SCRIPTS processor immediately.
		 */
		sym_dequeue_from_squeue(np, i, cp->target, cp->lun, -1);
		OUTL_DSP(np, SCRIPTA_BA(np, start));

 		/*
		 *  Save some info of the actual IO.
		 *  Compute the data residual.
		 */
		cp->sv_scsi_status = cp->ssss_status;
		cp->sv_xerr_status = cp->xerr_status;
		cp->sv_resid = sym_compute_residual(np, cp);

		/*
		 *  Prepare all needed data structures for 
		 *  requesting sense data.
		 */

		cp->scsi_smsg2[0] = IDENTIFY(0, cp->lun);
		msglen = 1;

		/*
		 *  If we are currently using anything different from 
		 *  async. 8 bit data transfers with that target,
		 *  start a negotiation, since the device may want 
		 *  to report us a UNIT ATTENTION condition due to 
		 *  a cause we currently ignore, and we donnot want 
		 *  to be stuck with WIDE and/or SYNC data transfer.
		 *
		 *  cp->nego_status is filled by sym_prepare_nego().
		 */
		cp->nego_status = 0;
		msglen += sym_prepare_nego(np, cp, &cp->scsi_smsg2[msglen]);
		/*
		 *  Message table indirect structure.
		 */
		cp->phys.smsg.addr	= CCB_BA(cp, scsi_smsg2);
		cp->phys.smsg.size	= cpu_to_scr(msglen);

		/*
		 *  sense command
		 */
		cp->phys.cmd.addr	= CCB_BA(cp, sensecmd);
		cp->phys.cmd.size	= cpu_to_scr(6);

		/*
		 *  patch requested size into sense command
		 */
		cp->sensecmd[0]		= REQUEST_SENSE;
		cp->sensecmd[1]		= 0;
		if (cp->cmd->device->scsi_level <= SCSI_2 && cp->lun <= 7)
			cp->sensecmd[1]	= cp->lun << 5;
		cp->sensecmd[4]		= SYM_SNS_BBUF_LEN;
		cp->data_len		= SYM_SNS_BBUF_LEN;

		/*
		 *  sense data
		 */
		memset(cp->sns_bbuf, 0, SYM_SNS_BBUF_LEN);
		cp->phys.sense.addr	= CCB_BA(cp, sns_bbuf);
		cp->phys.sense.size	= cpu_to_scr(SYM_SNS_BBUF_LEN);

		/*
		 *  requeue the command.
		 */
		startp = SCRIPTB_BA(np, sdata_in);

		cp->phys.head.savep	= cpu_to_scr(startp);
		cp->phys.head.lastp	= cpu_to_scr(startp);
		cp->startp		= cpu_to_scr(startp);
		cp->goalp		= cpu_to_scr(startp + 16);

		cp->host_xflags = 0;
		cp->host_status	= cp->nego_status ? HS_NEGOTIATE : HS_BUSY;
		cp->ssss_status = S_ILLEGAL;
		cp->host_flags	= (HF_SENSE|HF_DATA_IN);
		cp->xerr_status = 0;
		cp->extra_bytes = 0;

		cp->phys.head.go.start = cpu_to_scr(SCRIPTA_BA(np, select));

		/*
		 *  Requeue the command.
		 */
		sym_put_start_queue(np, cp);

		/*
		 *  Give back to upper layer everything we have dequeued.
		 */
		sym_flush_comp_queue(np, 0);
		break;
	}
}

/*
 *  After a device has accepted some management message 
 *  as BUS DEVICE RESET, ABORT TASK, etc ..., or when 
 *  a device signals a UNIT ATTENTION condition, some 
 *  tasks are thrown away by the device. We are required 
 *  to reflect that on our tasks list since the device 
 *  will never complete these tasks.
 *
 *  This function move from the BUSY queue to the COMP 
 *  queue all disconnected CCBs for a given target that 
 *  match the following criteria:
 *  - lun=-1  means any logical UNIT otherwise a given one.
 *  - task=-1 means any task, otherwise a given one.
 */
int sym_clear_tasks(struct sym_hcb *np, int cam_status, int target, int lun, int task)
{
	SYM_QUEHEAD qtmp, *qp;
	int i = 0;
	struct sym_ccb *cp;

	/*
	 *  Move the entire BUSY queue to our temporary queue.
	 */
	sym_que_init(&qtmp);
	sym_que_splice(&np->busy_ccbq, &qtmp);
	sym_que_init(&np->busy_ccbq);

	/*
	 *  Put all CCBs that matches our criteria into 
	 *  the COMP queue and put back other ones into 
	 *  the BUSY queue.
	 */
	while ((qp = sym_remque_head(&qtmp)) != NULL) {
		struct scsi_cmnd *cmd;
		cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
		cmd = cp->cmd;
		if (cp->host_status != HS_DISCONNECT ||
		    cp->target != target	     ||
		    (lun  != -1 && cp->lun != lun)   ||
		    (task != -1 && 
			(cp->tag != NO_TAG && cp->scsi_smsg[2] != task))) {
			sym_insque_tail(&cp->link_ccbq, &np->busy_ccbq);
			continue;
		}
		sym_insque_tail(&cp->link_ccbq, &np->comp_ccbq);

		/* Preserve the software timeout condition */
		if (sym_get_cam_status(cmd) != DID_TIME_OUT)
			sym_set_cam_status(cmd, cam_status);
		++i;
#if 0
printf("XXXX TASK @%p CLEARED\n", cp);
#endif
	}
	return i;
}

/*
 *  chip handler for TASKS recovery
 *
 *  We cannot safely abort a command, while the SCRIPTS 
 *  processor is running, since we just would be in race 
 *  with it.
 *
 *  As long as we have tasks to abort, we keep the SEM 
 *  bit set in the ISTAT. When this bit is set, the 
 *  SCRIPTS processor interrupts (SIR_SCRIPT_STOPPED) 
 *  each time it enters the scheduler.
 *
 *  If we have to reset a target, clear tasks of a unit,
 *  or to perform the abort of a disconnected job, we 
 *  restart the SCRIPTS for selecting the target. Once 
 *  selected, the SCRIPTS interrupts (SIR_TARGET_SELECTED).
 *  If it loses arbitration, the SCRIPTS will interrupt again 
 *  the next time it will enter its scheduler, and so on ...
 *
 *  On SIR_TARGET_SELECTED, we scan for the more 
 *  appropriate thing to do:
 *
 *  - If nothing, we just sent a M_ABORT message to the 
 *    target to get rid of the useless SCSI bus ownership.
 *    According to the specs, no tasks shall be affected.
 *  - If the target is to be reset, we send it a M_RESET 
 *    message.
 *  - If a logical UNIT is to be cleared , we send the 
 *    IDENTIFY(lun) + M_ABORT.
 *  - If an untagged task is to be aborted, we send the 
 *    IDENTIFY(lun) + M_ABORT.
 *  - If a tagged task is to be aborted, we send the 
 *    IDENTIFY(lun) + task attributes + M_ABORT_TAG.
 *
 *  Once our 'kiss of death' :) message has been accepted 
 *  by the target, the SCRIPTS interrupts again 
 *  (SIR_ABORT_SENT). On this interrupt, we complete 
 *  all the CCBs that should have been aborted by the 
 *  target according to our message.
 */
static void sym_sir_task_recovery(struct sym_hcb *np, int num)
{
	SYM_QUEHEAD *qp;
	struct sym_ccb *cp;
	struct sym_tcb *tp = NULL; /* gcc isn't quite smart enough yet */
	struct scsi_target *starget;
	int target=-1, lun=-1, task;
	int i, k;

	switch(num) {
	/*
	 *  The SCRIPTS processor stopped before starting
	 *  the next command in order to allow us to perform 
	 *  some task recovery.
	 */
	case SIR_SCRIPT_STOPPED:
		/*
		 *  Do we have any target to reset or unit to clear ?
		 */
		for (i = 0 ; i < SYM_CONF_MAX_TARGET ; i++) {
			tp = &np->target[i];
			if (tp->to_reset || 
			    (tp->lun0p && tp->lun0p->to_clear)) {
				target = i;
				break;
			}
			if (!tp->lunmp)
				continue;
			for (k = 1 ; k < SYM_CONF_MAX_LUN ; k++) {
				if (tp->lunmp[k] && tp->lunmp[k]->to_clear) {
					target	= i;
					break;
				}
			}
			if (target != -1)
				break;
		}

		/*
		 *  If not, walk the busy queue for any 
		 *  disconnected CCB to be aborted.
		 */
		if (target == -1) {
			FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
				cp = sym_que_entry(qp,struct sym_ccb,link_ccbq);
				if (cp->host_status != HS_DISCONNECT)
					continue;
				if (cp->to_abort) {
					target = cp->target;
					break;
				}
			}
		}

		/*
		 *  If some target is to be selected, 
		 *  prepare and start the selection.
		 */
		if (target != -1) {
			tp = &np->target[target];
			np->abrt_sel.sel_id	= target;
			np->abrt_sel.sel_scntl3 = tp->head.wval;
			np->abrt_sel.sel_sxfer  = tp->head.sval;
			OUTL(np, nc_dsa, np->hcb_ba);
			OUTL_DSP(np, SCRIPTB_BA(np, sel_for_abort));
			return;
		}

		/*
		 *  Now look for a CCB to abort that haven't started yet.
		 *  Btw, the SCRIPTS processor is still stopped, so 
		 *  we are not in race.
		 */
		i = 0;
		cp = NULL;
		FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
			cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
			if (cp->host_status != HS_BUSY &&
			    cp->host_status != HS_NEGOTIATE)
				continue;
			if (!cp->to_abort)
				continue;
#ifdef SYM_CONF_IARB_SUPPORT
			/*
			 *    If we are using IMMEDIATE ARBITRATION, we donnot 
			 *    want to cancel the last queued CCB, since the 
			 *    SCRIPTS may have anticipated the selection.
			 */
			if (cp == np->last_cp) {
				cp->to_abort = 0;
				continue;
			}
#endif
			i = 1;	/* Means we have found some */
			break;
		}
		if (!i) {
			/*
			 *  We are done, so we donnot need 
			 *  to synchronize with the SCRIPTS anylonger.
			 *  Remove the SEM flag from the ISTAT.
			 */
			np->istat_sem = 0;
			OUTB(np, nc_istat, SIGP);
			break;
		}
		/*
		 *  Compute index of next position in the start 
		 *  queue the SCRIPTS intends to start and dequeue 
		 *  all CCBs for that device that haven't been started.
		 */
		i = (INL(np, nc_scratcha) - np->squeue_ba) / 4;
		i = sym_dequeue_from_squeue(np, i, cp->target, cp->lun, -1);

		/*
		 *  Make sure at least our IO to abort has been dequeued.
		 */
#ifndef SYM_OPT_HANDLE_DEVICE_QUEUEING
		assert(i && sym_get_cam_status(cp->cmd) == DID_SOFT_ERROR);
#else
		sym_remque(&cp->link_ccbq);
		sym_insque_tail(&cp->link_ccbq, &np->comp_ccbq);
#endif
		/*
		 *  Keep track in cam status of the reason of the abort.
		 */
		if (cp->to_abort == 2)
			sym_set_cam_status(cp->cmd, DID_TIME_OUT);
		else
			sym_set_cam_status(cp->cmd, DID_ABORT);

		/*
		 *  Complete with error everything that we have dequeued.
	 	 */
		sym_flush_comp_queue(np, 0);
		break;
	/*
	 *  The SCRIPTS processor has selected a target 
	 *  we may have some manual recovery to perform for.
	 */
	case SIR_TARGET_SELECTED:
		target = INB(np, nc_sdid) & 0xf;
		tp = &np->target[target];

		np->abrt_tbl.addr = cpu_to_scr(vtobus(np->abrt_msg));

		/*
		 *  If the target is to be reset, prepare a 
		 *  M_RESET message and clear the to_reset flag 
		 *  since we donnot expect this operation to fail.
		 */
		if (tp->to_reset) {
			np->abrt_msg[0] = M_RESET;
			np->abrt_tbl.size = 1;
			tp->to_reset = 0;
			break;
		}

		/*
		 *  Otherwise, look for some logical unit to be cleared.
		 */
		if (tp->lun0p && tp->lun0p->to_clear)
			lun = 0;
		else if (tp->lunmp) {
			for (k = 1 ; k < SYM_CONF_MAX_LUN ; k++) {
				if (tp->lunmp[k] && tp->lunmp[k]->to_clear) {
					lun = k;
					break;
				}
			}
		}

		/*
		 *  If a logical unit is to be cleared, prepare 
		 *  an IDENTIFY(lun) + ABORT MESSAGE.
		 */
		if (lun != -1) {
			struct sym_lcb *lp = sym_lp(tp, lun);
			lp->to_clear = 0; /* We don't expect to fail here */
			np->abrt_msg[0] = IDENTIFY(0, lun);
			np->abrt_msg[1] = M_ABORT;
			np->abrt_tbl.size = 2;
			break;
		}

		/*
		 *  Otherwise, look for some disconnected job to 
		 *  abort for this target.
		 */
		i = 0;
		cp = NULL;
		FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
			cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
			if (cp->host_status != HS_DISCONNECT)
				continue;
			if (cp->target != target)
				continue;
			if (!cp->to_abort)
				continue;
			i = 1;	/* Means we have some */
			break;
		}

		/*
		 *  If we have none, probably since the device has 
		 *  completed the command before we won abitration,
		 *  send a M_ABORT message without IDENTIFY.
		 *  According to the specs, the device must just 
		 *  disconnect the BUS and not abort any task.
		 */
		if (!i) {
			np->abrt_msg[0] = M_ABORT;
			np->abrt_tbl.size = 1;
			break;
		}

		/*
		 *  We have some task to abort.
		 *  Set the IDENTIFY(lun)
		 */
		np->abrt_msg[0] = IDENTIFY(0, cp->lun);

		/*
		 *  If we want to abort an untagged command, we 
		 *  will send a IDENTIFY + M_ABORT.
		 *  Otherwise (tagged command), we will send 
		 *  a IDENTITFY + task attributes + ABORT TAG.
		 */
		if (cp->tag == NO_TAG) {
			np->abrt_msg[1] = M_ABORT;
			np->abrt_tbl.size = 2;
		} else {
			np->abrt_msg[1] = cp->scsi_smsg[1];
			np->abrt_msg[2] = cp->scsi_smsg[2];
			np->abrt_msg[3] = M_ABORT_TAG;
			np->abrt_tbl.size = 4;
		}
		/*
		 *  Keep track of software timeout condition, since the 
		 *  peripheral driver may not count retries on abort 
		 *  conditions not due to timeout.
		 */
		if (cp->to_abort == 2)
			sym_set_cam_status(cp->cmd, DID_TIME_OUT);
		cp->to_abort = 0; /* We donnot expect to fail here */
		break;

	/*
	 *  The target has accepted our message and switched 
	 *  to BUS FREE phase as we expected.
	 */
	case SIR_ABORT_SENT:
		target = INB(np, nc_sdid) & 0xf;
		tp = &np->target[target];
		starget = tp->starget;
		
		/*
		**  If we didn't abort anything, leave here.
		*/
		if (np->abrt_msg[0] == M_ABORT)
			break;

		/*
		 *  If we sent a M_RESET, then a hardware reset has 
		 *  been performed by the target.
		 *  - Reset everything to async 8 bit
		 *  - Tell ourself to negotiate next time :-)
		 *  - Prepare to clear all disconnected CCBs for 
		 *    this target from our task list (lun=task=-1)
		 */
		lun = -1;
		task = -1;
		if (np->abrt_msg[0] == M_RESET) {
			tp->head.sval = 0;
			tp->head.wval = np->rv_scntl3;
			tp->head.uval = 0;
			spi_period(starget) = 0;
			spi_offset(starget) = 0;
			spi_width(starget) = 0;
			spi_iu(starget) = 0;
			spi_dt(starget) = 0;
			spi_qas(starget) = 0;
			tp->tgoal.check_nego = 1;
			tp->tgoal.renego = 0;
		}

		/*
		 *  Otherwise, check for the LUN and TASK(s) 
		 *  concerned by the cancelation.
		 *  If it is not ABORT_TAG then it is CLEAR_QUEUE 
		 *  or an ABORT message :-)
		 */
		else {
			lun = np->abrt_msg[0] & 0x3f;
			if (np->abrt_msg[1] == M_ABORT_TAG)
				task = np->abrt_msg[2];
		}

		/*
		 *  Complete all the CCBs the device should have 
		 *  aborted due to our 'kiss of death' message.
		 */
		i = (INL(np, nc_scratcha) - np->squeue_ba) / 4;
		sym_dequeue_from_squeue(np, i, target, lun, -1);
		sym_clear_tasks(np, DID_ABORT, target, lun, task);
		sym_flush_comp_queue(np, 0);

 		/*
		 *  If we sent a BDR, make upper layer aware of that.
 		 */
		if (np->abrt_msg[0] == M_RESET)
			starget_printk(KERN_NOTICE, starget,
							"has been reset\n");
		break;
	}

	/*
	 *  Print to the log the message we intend to send.
	 */
	if (num == SIR_TARGET_SELECTED) {
		dev_info(&tp->starget->dev, "control msgout:");
		sym_printl_hex(np->abrt_msg, np->abrt_tbl.size);
		np->abrt_tbl.size = cpu_to_scr(np->abrt_tbl.size);
	}

	/*
	 *  Let the SCRIPTS processor continue.
	 */
	OUTONB_STD();
}

/*
 *  Gerard's alchemy:) that deals with with the data 
 *  pointer for both MDP and the residual calculation.
 *
 *  I didn't want to bloat the code by more than 200 
 *  lines for the handling of both MDP and the residual.
 *  This has been achieved by using a data pointer 
 *  representation consisting in an index in the data 
 *  array (dp_sg) and a negative offset (dp_ofs) that 
 *  have the following meaning:
 *
 *  - dp_sg = SYM_CONF_MAX_SG
 *    we are at the end of the data script.
 *  - dp_sg < SYM_CONF_MAX_SG
 *    dp_sg points to the next entry of the scatter array 
 *    we want to transfer.
 *  - dp_ofs < 0
 *    dp_ofs represents the residual of bytes of the 
 *    previous entry scatter entry we will send first.
 *  - dp_ofs = 0
 *    no residual to send first.
 *
 *  The function sym_evaluate_dp() accepts an arbitray 
 *  offset (basically from the MDP message) and returns 
 *  the corresponding values of dp_sg and dp_ofs.
 */

static int sym_evaluate_dp(struct sym_hcb *np, struct sym_ccb *cp, u32 scr, int *ofs)
{
	u32	dp_scr;
	int	dp_ofs, dp_sg, dp_sgmin;
	int	tmp;
	struct sym_pmc *pm;

	/*
	 *  Compute the resulted data pointer in term of a script 
	 *  address within some DATA script and a signed byte offset.
	 */
	dp_scr = scr;
	dp_ofs = *ofs;
	if	(dp_scr == SCRIPTA_BA(np, pm0_data))
		pm = &cp->phys.pm0;
	else if (dp_scr == SCRIPTA_BA(np, pm1_data))
		pm = &cp->phys.pm1;
	else
		pm = NULL;

	if (pm) {
		dp_scr  = scr_to_cpu(pm->ret);
		dp_ofs -= scr_to_cpu(pm->sg.size) & 0x00ffffff;
	}

	/*
	 *  If we are auto-sensing, then we are done.
	 */
	if (cp->host_flags & HF_SENSE) {
		*ofs = dp_ofs;
		return 0;
	}

	/*
	 *  Deduce the index of the sg entry.
	 *  Keep track of the index of the first valid entry.
	 *  If result is dp_sg = SYM_CONF_MAX_SG, then we are at the 
	 *  end of the data.
	 */
	tmp = scr_to_cpu(cp->goalp);
	dp_sg = SYM_CONF_MAX_SG;
	if (dp_scr != tmp)
		dp_sg -= (tmp - 8 - (int)dp_scr) / (2*4);
	dp_sgmin = SYM_CONF_MAX_SG - cp->segments;

	/*
	 *  Move to the sg entry the data pointer belongs to.
	 *
	 *  If we are inside the data area, we expect result to be:
	 *
	 *  Either,
	 *      dp_ofs = 0 and dp_sg is the index of the sg entry
	 *      the data pointer belongs to (or the end of the data)
	 *  Or,
	 *      dp_ofs < 0 and dp_sg is the index of the sg entry 
	 *      the data pointer belongs to + 1.
	 */
	if (dp_ofs < 0) {
		int n;
		while (dp_sg > dp_sgmin) {
			--dp_sg;
			tmp = scr_to_cpu(cp->phys.data[dp_sg].size);
			n = dp_ofs + (tmp & 0xffffff);
			if (n > 0) {
				++dp_sg;
				break;
			}
			dp_ofs = n;
		}
	}
	else if (dp_ofs > 0) {
		while (dp_sg < SYM_CONF_MAX_SG) {
			tmp = scr_to_cpu(cp->phys.data[dp_sg].size);
			dp_ofs -= (tmp & 0xffffff);
			++dp_sg;
			if (dp_ofs <= 0)
				break;
		}
	}

	/*
	 *  Make sure the data pointer is inside the data area.
	 *  If not, return some error.
	 */
	if	(dp_sg < dp_sgmin || (dp_sg == dp_sgmin && dp_ofs < 0))
		goto out_err;
	else if	(dp_sg > SYM_CONF_MAX_SG ||
		 (dp_sg == SYM_CONF_MAX_SG && dp_ofs > 0))
		goto out_err;

	/*
	 *  Save the extreme pointer if needed.
	 */
	if (dp_sg > cp->ext_sg ||
            (dp_sg == cp->ext_sg && dp_ofs > cp->ext_ofs)) {
		cp->ext_sg  = dp_sg;
		cp->ext_ofs = dp_ofs;
	}

	/*
	 *  Return data.
	 */
	*ofs = dp_ofs;
	return dp_sg;

out_err:
	return -1;
}

/*
 *  chip handler for MODIFY DATA POINTER MESSAGE
 *
 *  We also call this function on IGNORE WIDE RESIDUE 
 *  messages that do not match a SWIDE full condition.
 *  Btw, we assume in that situation that such a message 
 *  is equivalent to a MODIFY DATA POINTER (offset=-1).
 */

static void sym_modify_dp(struct sym_hcb *np, struct sym_tcb *tp, struct sym_ccb *cp, int ofs)
{
	int dp_ofs	= ofs;
	u32	dp_scr	= sym_get_script_dp (np, cp);
	u32	dp_ret;
	u32	tmp;
	u_char	hflags;
	int	dp_sg;
	struct	sym_pmc *pm;

	/*
	 *  Not supported for auto-sense.
	 */
	if (cp->host_flags & HF_SENSE)
		goto out_reject;

	/*
	 *  Apply our alchemy:) (see comments in sym_evaluate_dp()), 
	 *  to the resulted data pointer.
	 */
	dp_sg = sym_evaluate_dp(np, cp, dp_scr, &dp_ofs);
	if (dp_sg < 0)
		goto out_reject;

	/*
	 *  And our alchemy:) allows to easily calculate the data 
	 *  script address we want to return for the next data phase.
	 */
	dp_ret = cpu_to_scr(cp->goalp);
	dp_ret = dp_ret - 8 - (SYM_CONF_MAX_SG - dp_sg) * (2*4);

	/*
	 *  If offset / scatter entry is zero we donnot need 
	 *  a context for the new current data pointer.
	 */
	if (dp_ofs == 0) {
		dp_scr = dp_ret;
		goto out_ok;
	}

	/*
	 *  Get a context for the new current data pointer.
	 */
	hflags = INB(np, HF_PRT);

	if (hflags & HF_DP_SAVED)
		hflags ^= HF_ACT_PM;

	if (!(hflags & HF_ACT_PM)) {
		pm  = &cp->phys.pm0;
		dp_scr = SCRIPTA_BA(np, pm0_data);
	}
	else {
		pm = &cp->phys.pm1;
		dp_scr = SCRIPTA_BA(np, pm1_data);
	}

	hflags &= ~(HF_DP_SAVED);

	OUTB(np, HF_PRT, hflags);

	/*
	 *  Set up the new current data pointer.
	 *  ofs < 0 there, and for the next data phase, we 
	 *  want to transfer part of the data of the sg entry 
	 *  corresponding to index dp_sg-1 prior to returning 
	 *  to the main data script.
	 */
	pm->ret = cpu_to_scr(dp_ret);
	tmp  = scr_to_cpu(cp->phys.data[dp_sg-1].addr);
	tmp += scr_to_cpu(cp->phys.data[dp_sg-1].size) + dp_ofs;
	pm->sg.addr = cpu_to_scr(tmp);
	pm->sg.size = cpu_to_scr(-dp_ofs);

out_ok:
	sym_set_script_dp (np, cp, dp_scr);
	OUTL_DSP(np, SCRIPTA_BA(np, clrack));
	return;

out_reject:
	OUTL_DSP(np, SCRIPTB_BA(np, msg_bad));
}


/*
 *  chip calculation of the data residual.
 *
 *  As I used to say, the requirement of data residual 
 *  in SCSI is broken, useless and cannot be achieved 
 *  without huge complexity.
 *  But most OSes and even the official CAM require it.
 *  When stupidity happens to be so widely spread inside 
 *  a community, it gets hard to convince.
 *
 *  Anyway, I don't care, since I am not going to use 
 *  any software that considers this data residual as 
 *  a relevant information. :)
 */

int sym_compute_residual(struct sym_hcb *np, struct sym_ccb *cp)
{
	int dp_sg, resid = 0;
	int dp_ofs = 0;

	/*
	 *  Check for some data lost or just thrown away.
	 *  We are not required to be quite accurate in this 
	 *  situation. Btw, if we are odd for output and the 
	 *  device claims some more data, it may well happen 
	 *  than our residual be zero. :-)
	 */
	if (cp->xerr_status & (XE_EXTRA_DATA|XE_SODL_UNRUN|XE_SWIDE_OVRUN)) {
		if (cp->xerr_status & XE_EXTRA_DATA)
			resid -= cp->extra_bytes;
		if (cp->xerr_status & XE_SODL_UNRUN)
			++resid;
		if (cp->xerr_status & XE_SWIDE_OVRUN)
			--resid;
	}

	/*
	 *  If all data has been transferred,
	 *  there is no residual.
	 */
	if (cp->phys.head.lastp == cp->goalp)
		return resid;

	/*
	 *  If no data transfer occurs, or if the data
	 *  pointer is weird, return full residual.
	 */
	if (cp->startp == cp->phys.head.lastp ||
	    sym_evaluate_dp(np, cp, scr_to_cpu(cp->phys.head.lastp),
			    &dp_ofs) < 0) {
		return cp->data_len - cp->odd_byte_adjustment;
	}

	/*
	 *  If we were auto-sensing, then we are done.
	 */
	if (cp->host_flags & HF_SENSE) {
		return -dp_ofs;
	}

	/*
	 *  We are now full comfortable in the computation 
	 *  of the data residual (2's complement).
	 */
	resid = -cp->ext_ofs;
	for (dp_sg = cp->ext_sg; dp_sg < SYM_CONF_MAX_SG; ++dp_sg) {
		u_int tmp = scr_to_cpu(cp->phys.data[dp_sg].size);
		resid += (tmp & 0xffffff);
	}

	resid -= cp->odd_byte_adjustment;

	/*
	 *  Hopefully, the result is not too wrong.
	 */
	return resid;
}

/*
 *  Negotiation for WIDE and SYNCHRONOUS DATA TRANSFER.
 *
 *  When we try to negotiate, we append the negotiation message
 *  to the identify and (maybe) simple tag message.
 *  The host status field is set to HS_NEGOTIATE to mark this
 *  situation.
 *
 *  If the target doesn't answer this message immediately
 *  (as required by the standard), the SIR_NEGO_FAILED interrupt
 *  will be raised eventually.
 *  The handler removes the HS_NEGOTIATE status, and sets the
 *  negotiated value to the default (async / nowide).
 *
 *  If we receive a matching answer immediately, we check it
 *  for validity, and set the values.
 *
 *  If we receive a Reject message immediately, we assume the
 *  negotiation has failed, and fall back to standard values.
 *
 *  If we receive a negotiation message while not in HS_NEGOTIATE
 *  state, it's a target initiated negotiation. We prepare a
 *  (hopefully) valid answer, set our parameters, and send back 
 *  this answer to the target.
 *
 *  If the target doesn't fetch the answer (no message out phase),
 *  we assume the negotiation has failed, and fall back to default
 *  settings (SIR_NEGO_PROTO interrupt).
 *
 *  When we set the values, we adjust them in all ccbs belonging 
 *  to this target, in the controller's register, and in the "phys"
 *  field of the controller's struct sym_hcb.
 */

/*
 *  chip handler for SYNCHRONOUS DATA TRANSFER REQUEST (SDTR) message.
 */
static int  
sym_sync_nego_check(struct sym_hcb *np, int req, struct sym_ccb *cp)
{
	int target = cp->target;
	u_char	chg, ofs, per, fak, div;

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_nego_msg(np, target, "sync msgin", np->msgin);
	}

	/*
	 *  Get requested values.
	 */
	chg = 0;
	per = np->msgin[3];
	ofs = np->msgin[4];

	/*
	 *  Check values against our limits.
	 */
	if (ofs) {
		if (ofs > np->maxoffs)
			{chg = 1; ofs = np->maxoffs;}
	}

	if (ofs) {
		if (per < np->minsync)
			{chg = 1; per = np->minsync;}
	}

	/*
	 *  Get new chip synchronous parameters value.
	 */
	div = fak = 0;
	if (ofs && sym_getsync(np, 0, per, &div, &fak) < 0)
		goto reject_it;

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_addr(cp->cmd,
				"sdtr: ofs=%d per=%d div=%d fak=%d chg=%d.\n",
				ofs, per, div, fak, chg);
	}

	/*
	 *  If it was an answer we want to change, 
	 *  then it isn't acceptable. Reject it.
	 */
	if (!req && chg)
		goto reject_it;

	/*
	 *  Apply new values.
	 */
	sym_setsync (np, target, ofs, per, div, fak);

	/*
	 *  It was an answer. We are done.
	 */
	if (!req)
		return 0;

	/*
	 *  It was a request. Prepare an answer message.
	 */
	spi_populate_sync_msg(np->msgout, per, ofs);

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_nego_msg(np, target, "sync msgout", np->msgout);
	}

	np->msgin [0] = M_NOOP;

	return 0;

reject_it:
	sym_setsync (np, target, 0, 0, 0, 0);
	return -1;
}

static void sym_sync_nego(struct sym_hcb *np, struct sym_tcb *tp, struct sym_ccb *cp)
{
	int req = 1;
	int result;

	/*
	 *  Request or answer ?
	 */
	if (INB(np, HS_PRT) == HS_NEGOTIATE) {
		OUTB(np, HS_PRT, HS_BUSY);
		if (cp->nego_status && cp->nego_status != NS_SYNC)
			goto reject_it;
		req = 0;
	}

	/*
	 *  Check and apply new values.
	 */
	result = sym_sync_nego_check(np, req, cp);
	if (result)	/* Not acceptable, reject it */
		goto reject_it;
	if (req) {	/* Was a request, send response. */
		cp->nego_status = NS_SYNC;
		OUTL_DSP(np, SCRIPTB_BA(np, sdtr_resp));
	}
	else		/* Was a response, we are done. */
		OUTL_DSP(np, SCRIPTA_BA(np, clrack));
	return;

reject_it:
	OUTL_DSP(np, SCRIPTB_BA(np, msg_bad));
}

/*
 *  chip handler for PARALLEL PROTOCOL REQUEST (PPR) message.
 */
static int 
sym_ppr_nego_check(struct sym_hcb *np, int req, int target)
{
	struct sym_tcb *tp = &np->target[target];
	unsigned char fak, div;
	int dt, chg = 0;

	unsigned char per = np->msgin[3];
	unsigned char ofs = np->msgin[5];
	unsigned char wide = np->msgin[6];
	unsigned char opts = np->msgin[7] & PPR_OPT_MASK;

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_nego_msg(np, target, "ppr msgin", np->msgin);
	}

	/*
	 *  Check values against our limits.
	 */
	if (wide > np->maxwide) {
		chg = 1;
		wide = np->maxwide;
	}
	if (!wide || !(np->features & FE_U3EN))
		opts = 0;

	if (opts != (np->msgin[7] & PPR_OPT_MASK))
		chg = 1;

	dt = opts & PPR_OPT_DT;

	if (ofs) {
		unsigned char maxoffs = dt ? np->maxoffs_dt : np->maxoffs;
		if (ofs > maxoffs) {
			chg = 1;
			ofs = maxoffs;
		}
	}

	if (ofs) {
		unsigned char minsync = dt ? np->minsync_dt : np->minsync;
		if (per < minsync) {
			chg = 1;
			per = minsync;
		}
	}

	/*
	 *  Get new chip synchronous parameters value.
	 */
	div = fak = 0;
	if (ofs && sym_getsync(np, dt, per, &div, &fak) < 0)
		goto reject_it;

	/*
	 *  If it was an answer we want to change, 
	 *  then it isn't acceptable. Reject it.
	 */
	if (!req && chg)
		goto reject_it;

	/*
	 *  Apply new values.
	 */
	sym_setpprot(np, target, opts, ofs, per, wide, div, fak);

	/*
	 *  It was an answer. We are done.
	 */
	if (!req)
		return 0;

	/*
	 *  It was a request. Prepare an answer message.
	 */
	spi_populate_ppr_msg(np->msgout, per, ofs, wide, opts);

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_nego_msg(np, target, "ppr msgout", np->msgout);
	}

	np->msgin [0] = M_NOOP;

	return 0;

reject_it:
	sym_setpprot (np, target, 0, 0, 0, 0, 0, 0);
	/*
	 *  If it is a device response that should result in  
	 *  ST, we may want to try a legacy negotiation later.
	 */
	if (!req && !opts) {
		tp->tgoal.period = per;
		tp->tgoal.offset = ofs;
		tp->tgoal.width = wide;
		tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
		tp->tgoal.check_nego = 1;
	}
	return -1;
}

static void sym_ppr_nego(struct sym_hcb *np, struct sym_tcb *tp, struct sym_ccb *cp)
{
	int req = 1;
	int result;

	/*
	 *  Request or answer ?
	 */
	if (INB(np, HS_PRT) == HS_NEGOTIATE) {
		OUTB(np, HS_PRT, HS_BUSY);
		if (cp->nego_status && cp->nego_status != NS_PPR)
			goto reject_it;
		req = 0;
	}

	/*
	 *  Check and apply new values.
	 */
	result = sym_ppr_nego_check(np, req, cp->target);
	if (result)	/* Not acceptable, reject it */
		goto reject_it;
	if (req) {	/* Was a request, send response. */
		cp->nego_status = NS_PPR;
		OUTL_DSP(np, SCRIPTB_BA(np, ppr_resp));
	}
	else		/* Was a response, we are done. */
		OUTL_DSP(np, SCRIPTA_BA(np, clrack));
	return;

reject_it:
	OUTL_DSP(np, SCRIPTB_BA(np, msg_bad));
}

/*
 *  chip handler for WIDE DATA TRANSFER REQUEST (WDTR) message.
 */
static int  
sym_wide_nego_check(struct sym_hcb *np, int req, struct sym_ccb *cp)
{
	int target = cp->target;
	u_char	chg, wide;

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_nego_msg(np, target, "wide msgin", np->msgin);
	}

	/*
	 *  Get requested values.
	 */
	chg  = 0;
	wide = np->msgin[3];

	/*
	 *  Check values against our limits.
	 */
	if (wide > np->maxwide) {
		chg = 1;
		wide = np->maxwide;
	}

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_addr(cp->cmd, "wdtr: wide=%d chg=%d.\n",
				wide, chg);
	}

	/*
	 *  If it was an answer we want to change, 
	 *  then it isn't acceptable. Reject it.
	 */
	if (!req && chg)
		goto reject_it;

	/*
	 *  Apply new values.
	 */
	sym_setwide (np, target, wide);

	/*
	 *  It was an answer. We are done.
	 */
	if (!req)
		return 0;

	/*
	 *  It was a request. Prepare an answer message.
	 */
	spi_populate_width_msg(np->msgout, wide);

	np->msgin [0] = M_NOOP;

	if (DEBUG_FLAGS & DEBUG_NEGO) {
		sym_print_nego_msg(np, target, "wide msgout", np->msgout);
	}

	return 0;

reject_it:
	return -1;
}

static void sym_wide_nego(struct sym_hcb *np, struct sym_tcb *tp, struct sym_ccb *cp)
{
	int req = 1;
	int result;

	/*
	 *  Request or answer ?
	 */
	if (INB(np, HS_PRT) == HS_NEGOTIATE) {
		OUTB(np, HS_PRT, HS_BUSY);
		if (cp->nego_status && cp->nego_status != NS_WIDE)
			goto reject_it;
		req = 0;
	}

	/*
	 *  Check and apply new values.
	 */
	result = sym_wide_nego_check(np, req, cp);
	if (result)	/* Not acceptable, reject it */
		goto reject_it;
	if (req) {	/* Was a request, send response. */
		cp->nego_status = NS_WIDE;
		OUTL_DSP(np, SCRIPTB_BA(np, wdtr_resp));
	} else {		/* Was a response. */
		/*
		 * Negotiate for SYNC immediately after WIDE response.
		 * This allows to negotiate for both WIDE and SYNC on 
		 * a single SCSI command (Suggested by Justin Gibbs).
		 */
		if (tp->tgoal.offset) {
			spi_populate_sync_msg(np->msgout, tp->tgoal.period,
					tp->tgoal.offset);

			if (DEBUG_FLAGS & DEBUG_NEGO) {
				sym_print_nego_msg(np, cp->target,
				                   "sync msgout", np->msgout);
			}

			cp->nego_status = NS_SYNC;
			OUTB(np, HS_PRT, HS_NEGOTIATE);
			OUTL_DSP(np, SCRIPTB_BA(np, sdtr_resp));
			return;
		} else
			OUTL_DSP(np, SCRIPTA_BA(np, clrack));
	}

	return;

reject_it:
	OUTL_DSP(np, SCRIPTB_BA(np, msg_bad));
}

/*
 *  Reset DT, SYNC or WIDE to default settings.
 *
 *  Called when a negotiation does not succeed either 
 *  on rejection or on protocol error.
 *
 *  A target that understands a PPR message should never 
 *  reject it, and messing with it is very unlikely.
 *  So, if a PPR makes problems, we may just want to 
 *  try a legacy negotiation later.
 */
static void sym_nego_default(struct sym_hcb *np, struct sym_tcb *tp, struct sym_ccb *cp)
{
	switch (cp->nego_status) {
	case NS_PPR:
#if 0
		sym_setpprot (np, cp->target, 0, 0, 0, 0, 0, 0);
#else
		if (tp->tgoal.period < np->minsync)
			tp->tgoal.period = np->minsync;
		if (tp->tgoal.offset > np->maxoffs)
			tp->tgoal.offset = np->maxoffs;
		tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
		tp->tgoal.check_nego = 1;
#endif
		break;
	case NS_SYNC:
		sym_setsync (np, cp->target, 0, 0, 0, 0);
		break;
	case NS_WIDE:
		sym_setwide (np, cp->target, 0);
		break;
	}
	np->msgin [0] = M_NOOP;
	np->msgout[0] = M_NOOP;
	cp->nego_status = 0;
}

/*
 *  chip handler for MESSAGE REJECT received in response to 
 *  PPR, WIDE or SYNCHRONOUS negotiation.
 */
static void sym_nego_rejected(struct sym_hcb *np, struct sym_tcb *tp, struct sym_ccb *cp)
{
	sym_nego_default(np, tp, cp);
	OUTB(np, HS_PRT, HS_BUSY);
}

#define sym_printk(lvl, tp, cp, fmt, v...) do { \
	if (cp)							\
		scmd_printk(lvl, cp->cmd, fmt, ##v);		\
	else							\
		starget_printk(lvl, tp->starget, fmt, ##v);	\
} while (0)

/*
 *  chip exception handler for programmed interrupts.
 */
static void sym_int_sir(struct sym_hcb *np)
{
	u_char	num	= INB(np, nc_dsps);
	u32	dsa	= INL(np, nc_dsa);
	struct sym_ccb *cp	= sym_ccb_from_dsa(np, dsa);
	u_char	target	= INB(np, nc_sdid) & 0x0f;
	struct sym_tcb *tp	= &np->target[target];
	int	tmp;

	if (DEBUG_FLAGS & DEBUG_TINY) printf ("I#%d", num);

	switch (num) {
#if   SYM_CONF_DMA_ADDRESSING_MODE == 2
	/*
	 *  SCRIPTS tell us that we may have to update 
	 *  64 bit DMA segment registers.
	 */
	case SIR_DMAP_DIRTY:
		sym_update_dmap_regs(np);
		goto out;
#endif
	/*
	 *  Command has been completed with error condition 
	 *  or has been auto-sensed.
	 */
	case SIR_COMPLETE_ERROR:
		sym_complete_error(np, cp);
		return;
	/*
	 *  The C code is currently trying to recover from something.
	 *  Typically, user want to abort some command.
	 */
	case SIR_SCRIPT_STOPPED:
	case SIR_TARGET_SELECTED:
	case SIR_ABORT_SENT:
		sym_sir_task_recovery(np, num);
		return;
	/*
	 *  The device didn't go to MSG OUT phase after having 
	 *  been selected with ATN.  We do not want to handle that.
	 */
	case SIR_SEL_ATN_NO_MSG_OUT:
		sym_printk(KERN_WARNING, tp, cp,
				"No MSG OUT phase after selection with ATN\n");
		goto out_stuck;
	/*
	 *  The device didn't switch to MSG IN phase after 
	 *  having reselected the initiator.
	 */
	case SIR_RESEL_NO_MSG_IN:
		sym_printk(KERN_WARNING, tp, cp,
				"No MSG IN phase after reselection\n");
		goto out_stuck;
	/*
	 *  After reselection, the device sent a message that wasn't 
	 *  an IDENTIFY.
	 */
	case SIR_RESEL_NO_IDENTIFY:
		sym_printk(KERN_WARNING, tp, cp,
				"No IDENTIFY after reselection\n");
		goto out_stuck;
	/*
	 *  The device reselected a LUN we do not know about.
	 */
	case SIR_RESEL_BAD_LUN:
		np->msgout[0] = M_RESET;
		goto out;
	/*
	 *  The device reselected for an untagged nexus and we 
	 *  haven't any.
	 */
	case SIR_RESEL_BAD_I_T_L:
		np->msgout[0] = M_ABORT;
		goto out;
	/*
	 * The device reselected for a tagged nexus that we do not have.
	 */
	case SIR_RESEL_BAD_I_T_L_Q:
		np->msgout[0] = M_ABORT_TAG;
		goto out;
	/*
	 *  The SCRIPTS let us know that the device has grabbed 
	 *  our message and will abort the job.
	 */
	case SIR_RESEL_ABORTED:
		np->lastmsg = np->msgout[0];
		np->msgout[0] = M_NOOP;
		sym_printk(KERN_WARNING, tp, cp,
			"message %x sent on bad reselection\n", np->lastmsg);
		goto out;
	/*
	 *  The SCRIPTS let us know that a message has been 
	 *  successfully sent to the device.
	 */
	case SIR_MSG_OUT_DONE:
		np->lastmsg = np->msgout[0];
		np->msgout[0] = M_NOOP;
		/* Should we really care of that */
		if (np->lastmsg == M_PARITY || np->lastmsg == M_ID_ERROR) {
			if (cp) {
				cp->xerr_status &= ~XE_PARITY_ERR;
				if (!cp->xerr_status)
					OUTOFFB(np, HF_PRT, HF_EXT_ERR);
			}
		}
		goto out;
	/*
	 *  The device didn't send a GOOD SCSI status.
	 *  We may have some work to do prior to allow 
	 *  the SCRIPTS processor to continue.
	 */
	case SIR_BAD_SCSI_STATUS:
		if (!cp)
			goto out;
		sym_sir_bad_scsi_status(np, num, cp);
		return;
	/*
	 *  We are asked by the SCRIPTS to prepare a 
	 *  REJECT message.
	 */
	case SIR_REJECT_TO_SEND:
		sym_print_msg(cp, "M_REJECT to send for ", np->msgin);
		np->msgout[0] = M_REJECT;
		goto out;
	/*
	 *  We have been ODD at the end of a DATA IN 
	 *  transfer and the device didn't send a 
	 *  IGNORE WIDE RESIDUE message.
	 *  It is a data overrun condition.
	 */
	case SIR_SWIDE_OVERRUN:
		if (cp) {
			OUTONB(np, HF_PRT, HF_EXT_ERR);
			cp->xerr_status |= XE_SWIDE_OVRUN;
		}
		goto out;
	/*
	 *  We have been ODD at the end of a DATA OUT 
	 *  transfer.
	 *  It is a data underrun condition.
	 */
	case SIR_SODL_UNDERRUN:
		if (cp) {
			OUTONB(np, HF_PRT, HF_EXT_ERR);
			cp->xerr_status |= XE_SODL_UNRUN;
		}
		goto out;
	/*
	 *  The device wants us to tranfer more data than 
	 *  expected or in the wrong direction.
	 *  The number of extra bytes is in scratcha.
	 *  It is a data overrun condition.
	 */
	case SIR_DATA_OVERRUN:
		if (cp) {
			OUTONB(np, HF_PRT, HF_EXT_ERR);
			cp->xerr_status |= XE_EXTRA_DATA;
			cp->extra_bytes += INL(np, nc_scratcha);
		}
		goto out;
	/*
	 *  The device switched to an illegal phase (4/5).
	 */
	case SIR_BAD_PHASE:
		if (cp) {
			OUTONB(np, HF_PRT, HF_EXT_ERR);
			cp->xerr_status |= XE_BAD_PHASE;
		}
		goto out;
	/*
	 *  We received a message.
	 */
	case SIR_MSG_RECEIVED:
		if (!cp)
			goto out_stuck;
		switch (np->msgin [0]) {
		/*
		 *  We received an extended message.
		 *  We handle MODIFY DATA POINTER, SDTR, WDTR 
		 *  and reject all other extended messages.
		 */
		case M_EXTENDED:
			switch (np->msgin [2]) {
			case M_X_MODIFY_DP:
				if (DEBUG_FLAGS & DEBUG_POINTER)
					sym_print_msg(cp, "extended msg ",
						      np->msgin);
				tmp = (np->msgin[3]<<24) + (np->msgin[4]<<16) + 
				      (np->msgin[5]<<8)  + (np->msgin[6]);
				sym_modify_dp(np, tp, cp, tmp);
				return;
			case M_X_SYNC_REQ:
				sym_sync_nego(np, tp, cp);
				return;
			case M_X_PPR_REQ:
				sym_ppr_nego(np, tp, cp);
				return;
			case M_X_WIDE_REQ:
				sym_wide_nego(np, tp, cp);
				return;
			default:
				goto out_reject;
			}
			break;
		/*
		 *  We received a 1/2 byte message not handled from SCRIPTS.
		 *  We are only expecting MESSAGE REJECT and IGNORE WIDE 
		 *  RESIDUE messages that haven't been anticipated by 
		 *  SCRIPTS on SWIDE full condition. Unanticipated IGNORE 
		 *  WIDE RESIDUE messages are aliased as MODIFY DP (-1).
		 */
		case M_IGN_RESIDUE:
			if (DEBUG_FLAGS & DEBUG_POINTER)
				sym_print_msg(cp, "1 or 2 byte ", np->msgin);
			if (cp->host_flags & HF_SENSE)
				OUTL_DSP(np, SCRIPTA_BA(np, clrack));
			else
				sym_modify_dp(np, tp, cp, -1);
			return;
		case M_REJECT:
			if (INB(np, HS_PRT) == HS_NEGOTIATE)
				sym_nego_rejected(np, tp, cp);
			else {
				sym_print_addr(cp->cmd,
					"M_REJECT received (%x:%x).\n",
					scr_to_cpu(np->lastmsg), np->msgout[0]);
			}
			goto out_clrack;
			break;
		default:
			goto out_reject;
		}
		break;
	/*
	 *  We received an unknown message.
	 *  Ignore all MSG IN phases and reject it.
	 */
	case SIR_MSG_WEIRD:
		sym_print_msg(cp, "WEIRD message received", np->msgin);
		OUTL_DSP(np, SCRIPTB_BA(np, msg_weird));
		return;
	/*
	 *  Negotiation failed.
	 *  Target does not send us the reply.
	 *  Remove the HS_NEGOTIATE status.
	 */
	case SIR_NEGO_FAILED:
		OUTB(np, HS_PRT, HS_BUSY);
	/*
	 *  Negotiation failed.
	 *  Target does not want answer message.
	 */
	/* fall through */
	case SIR_NEGO_PROTO:
		sym_nego_default(np, tp, cp);
		goto out;
	}

out:
	OUTONB_STD();
	return;
out_reject:
	OUTL_DSP(np, SCRIPTB_BA(np, msg_bad));
	return;
out_clrack:
	OUTL_DSP(np, SCRIPTA_BA(np, clrack));
	return;
out_stuck:
	return;
}

/*
 *  Acquire a control block
 */
struct sym_ccb *sym_get_ccb (struct sym_hcb *np, struct scsi_cmnd *cmd, u_char tag_order)
{
	u_char tn = cmd->device->id;
	u_char ln = cmd->device->lun;
	struct sym_tcb *tp = &np->target[tn];
	struct sym_lcb *lp = sym_lp(tp, ln);
	u_short tag = NO_TAG;
	SYM_QUEHEAD *qp;
	struct sym_ccb *cp = NULL;

	/*
	 *  Look for a free CCB
	 */
	if (sym_que_empty(&np->free_ccbq))
		sym_alloc_ccb(np);
	qp = sym_remque_head(&np->free_ccbq);
	if (!qp)
		goto out;
	cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);

	{
		/*
		 *  If we have been asked for a tagged command.
		 */
		if (tag_order) {
			/*
			 *  Debugging purpose.
			 */
#ifndef SYM_OPT_HANDLE_DEVICE_QUEUEING
			if (lp->busy_itl != 0)
				goto out_free;
#endif
			/*
			 *  Allocate resources for tags if not yet.
			 */
			if (!lp->cb_tags) {
				sym_alloc_lcb_tags(np, tn, ln);
				if (!lp->cb_tags)
					goto out_free;
			}
			/*
			 *  Get a tag for this SCSI IO and set up
			 *  the CCB bus address for reselection, 
			 *  and count it for this LUN.
			 *  Toggle reselect path to tagged.
			 */
			if (lp->busy_itlq < SYM_CONF_MAX_TASK) {
				tag = lp->cb_tags[lp->ia_tag];
				if (++lp->ia_tag == SYM_CONF_MAX_TASK)
					lp->ia_tag = 0;
				++lp->busy_itlq;
#ifndef SYM_OPT_HANDLE_DEVICE_QUEUEING
				lp->itlq_tbl[tag] = cpu_to_scr(cp->ccb_ba);
				lp->head.resel_sa =
					cpu_to_scr(SCRIPTA_BA(np, resel_tag));
#endif
#ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
				cp->tags_si = lp->tags_si;
				++lp->tags_sum[cp->tags_si];
				++lp->tags_since;
#endif
			}
			else
				goto out_free;
		}
		/*
		 *  This command will not be tagged.
		 *  If we already have either a tagged or untagged 
		 *  one, refuse to overlap this untagged one.
		 */
		else {
			/*
			 *  Debugging purpose.
			 */
#ifndef SYM_OPT_HANDLE_DEVICE_QUEUEING
			if (lp->busy_itl != 0 || lp->busy_itlq != 0)
				goto out_free;
#endif
			/*
			 *  Count this nexus for this LUN.
			 *  Set up the CCB bus address for reselection.
			 *  Toggle reselect path to untagged.
			 */
			++lp->busy_itl;
#ifndef SYM_OPT_HANDLE_DEVICE_QUEUEING
			if (lp->busy_itl == 1) {
				lp->head.itl_task_sa = cpu_to_scr(cp->ccb_ba);
				lp->head.resel_sa =
				      cpu_to_scr(SCRIPTA_BA(np, resel_no_tag));
			}
			else
				goto out_free;
#endif
		}
	}
	/*
	 *  Put the CCB into the busy queue.
	 */
	sym_insque_tail(&cp->link_ccbq, &np->busy_ccbq);
#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	if (lp) {
		sym_remque(&cp->link2_ccbq);
		sym_insque_tail(&cp->link2_ccbq, &lp->waiting_ccbq);
	}

#endif
	cp->to_abort = 0;
	cp->odd_byte_adjustment = 0;
	cp->tag	   = tag;
	cp->order  = tag_order;
	cp->target = tn;
	cp->lun    = ln;

	if (DEBUG_FLAGS & DEBUG_TAGS) {
		sym_print_addr(cmd, "ccb @%p using tag %d.\n", cp, tag);
	}

out:
	return cp;
out_free:
	sym_insque_head(&cp->link_ccbq, &np->free_ccbq);
	return NULL;
}

/*
 *  Release one control block
 */
void sym_free_ccb (struct sym_hcb *np, struct sym_ccb *cp)
{
	struct sym_tcb *tp = &np->target[cp->target];
	struct sym_lcb *lp = sym_lp(tp, cp->lun);

	if (DEBUG_FLAGS & DEBUG_TAGS) {
		sym_print_addr(cp->cmd, "ccb @%p freeing tag %d.\n",
				cp, cp->tag);
	}

	/*
	 *  If LCB available,
	 */
	if (lp) {
		/*
		 *  If tagged, release the tag, set the relect path 
		 */
		if (cp->tag != NO_TAG) {
#ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
			--lp->tags_sum[cp->tags_si];
#endif
			/*
			 *  Free the tag value.
			 */
			lp->cb_tags[lp->if_tag] = cp->tag;
			if (++lp->if_tag == SYM_CONF_MAX_TASK)
				lp->if_tag = 0;
			/*
			 *  Make the reselect path invalid, 
			 *  and uncount this CCB.
			 */
			lp->itlq_tbl[cp->tag] = cpu_to_scr(np->bad_itlq_ba);
			--lp->busy_itlq;
		} else {	/* Untagged */
			/*
			 *  Make the reselect path invalid, 
			 *  and uncount this CCB.
			 */
			lp->head.itl_task_sa = cpu_to_scr(np->bad_itl_ba);
			--lp->busy_itl;
		}
		/*
		 *  If no JOB active, make the LUN reselect path invalid.
		 */
		if (lp->busy_itlq == 0 && lp->busy_itl == 0)
			lp->head.resel_sa =
				cpu_to_scr(SCRIPTB_BA(np, resel_bad_lun));
	}

	/*
	 *  We donnot queue more than 1 ccb per target 
	 *  with negotiation at any time. If this ccb was 
	 *  used for negotiation, clear this info in the tcb.
	 */
	if (cp == tp->nego_cp)
		tp->nego_cp = NULL;

#ifdef SYM_CONF_IARB_SUPPORT
	/*
	 *  If we just complete the last queued CCB,
	 *  clear this info that is no longer relevant.
	 */
	if (cp == np->last_cp)
		np->last_cp = 0;
#endif

	/*
	 *  Make this CCB available.
	 */
	cp->cmd = NULL;
	cp->host_status = HS_IDLE;
	sym_remque(&cp->link_ccbq);
	sym_insque_head(&cp->link_ccbq, &np->free_ccbq);

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	if (lp) {
		sym_remque(&cp->link2_ccbq);
		sym_insque_tail(&cp->link2_ccbq, &np->dummy_ccbq);
		if (cp->started) {
			if (cp->tag != NO_TAG)
				--lp->started_tags;
			else
				--lp->started_no_tag;
		}
	}
	cp->started = 0;
#endif
}

/*
 *  Allocate a CCB from memory and initialize its fixed part.
 */
static struct sym_ccb *sym_alloc_ccb(struct sym_hcb *np)
{
	struct sym_ccb *cp = NULL;
	int hcode;

	/*
	 *  Prevent from allocating more CCBs than we can 
	 *  queue to the controller.
	 */
	if (np->actccbs >= SYM_CONF_MAX_START)
		return NULL;

	/*
	 *  Allocate memory for this CCB.
	 */
	cp = sym_calloc_dma(sizeof(struct sym_ccb), "CCB");
	if (!cp)
		goto out_free;

	/*
	 *  Count it.
	 */
	np->actccbs++;

	/*
	 *  Compute the bus address of this ccb.
	 */
	cp->ccb_ba = vtobus(cp);

	/*
	 *  Insert this ccb into the hashed list.
	 */
	hcode = CCB_HASH_CODE(cp->ccb_ba);
	cp->link_ccbh = np->ccbh[hcode];
	np->ccbh[hcode] = cp;

	/*
	 *  Initialyze the start and restart actions.
	 */
	cp->phys.head.go.start   = cpu_to_scr(SCRIPTA_BA(np, idle));
	cp->phys.head.go.restart = cpu_to_scr(SCRIPTB_BA(np, bad_i_t_l));

 	/*
	 *  Initilialyze some other fields.
	 */
	cp->phys.smsg_ext.addr = cpu_to_scr(HCB_BA(np, msgin[2]));

	/*
	 *  Chain into free ccb queue.
	 */
	sym_insque_head(&cp->link_ccbq, &np->free_ccbq);

	/*
	 *  Chain into optionnal lists.
	 */
#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	sym_insque_head(&cp->link2_ccbq, &np->dummy_ccbq);
#endif
	return cp;
out_free:
	if (cp)
		sym_mfree_dma(cp, sizeof(*cp), "CCB");
	return NULL;
}

/*
 *  Look up a CCB from a DSA value.
 */
static struct sym_ccb *sym_ccb_from_dsa(struct sym_hcb *np, u32 dsa)
{
	int hcode;
	struct sym_ccb *cp;

	hcode = CCB_HASH_CODE(dsa);
	cp = np->ccbh[hcode];
	while (cp) {
		if (cp->ccb_ba == dsa)
			break;
		cp = cp->link_ccbh;
	}

	return cp;
}

/*
 *  Target control block initialisation.
 *  Nothing important to do at the moment.
 */
static void sym_init_tcb (struct sym_hcb *np, u_char tn)
{
#if 0	/*  Hmmm... this checking looks paranoid. */
	/*
	 *  Check some alignments required by the chip.
	 */	
	assert (((offsetof(struct sym_reg, nc_sxfer) ^
		offsetof(struct sym_tcb, head.sval)) &3) == 0);
	assert (((offsetof(struct sym_reg, nc_scntl3) ^
		offsetof(struct sym_tcb, head.wval)) &3) == 0);
#endif
}

/*
 *  Lun control block allocation and initialization.
 */
struct sym_lcb *sym_alloc_lcb (struct sym_hcb *np, u_char tn, u_char ln)
{
	struct sym_tcb *tp = &np->target[tn];
	struct sym_lcb *lp = NULL;

	/*
	 *  Initialize the target control block if not yet.
	 */
	sym_init_tcb (np, tn);

	/*
	 *  Allocate the LCB bus address array.
	 *  Compute the bus address of this table.
	 */
	if (ln && !tp->luntbl) {
		tp->luntbl = sym_calloc_dma(256, "LUNTBL");
		if (!tp->luntbl)
			goto fail;
		memset32(tp->luntbl, cpu_to_scr(vtobus(&np->badlun_sa)), 64);
		tp->head.luntbl_sa = cpu_to_scr(vtobus(tp->luntbl));
	}

	/*
	 *  Allocate the table of pointers for LUN(s) > 0, if needed.
	 */
	if (ln && !tp->lunmp) {
		tp->lunmp = kcalloc(SYM_CONF_MAX_LUN, sizeof(struct sym_lcb *),
				GFP_ATOMIC);
		if (!tp->lunmp)
			goto fail;
	}

	/*
	 *  Allocate the lcb.
	 *  Make it available to the chip.
	 */
	lp = sym_calloc_dma(sizeof(struct sym_lcb), "LCB");
	if (!lp)
		goto fail;
	if (ln) {
		tp->lunmp[ln] = lp;
		tp->luntbl[ln] = cpu_to_scr(vtobus(lp));
	}
	else {
		tp->lun0p = lp;
		tp->head.lun0_sa = cpu_to_scr(vtobus(lp));
	}
	tp->nlcb++;

	/*
	 *  Let the itl task point to error handling.
	 */
	lp->head.itl_task_sa = cpu_to_scr(np->bad_itl_ba);

	/*
	 *  Set the reselect pattern to our default. :)
	 */
	lp->head.resel_sa = cpu_to_scr(SCRIPTB_BA(np, resel_bad_lun));

	/*
	 *  Set user capabilities.
	 */
	lp->user_flags = tp->usrflags & (SYM_DISC_ENABLED | SYM_TAGS_ENABLED);

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	/*
	 *  Initialize device queueing.
	 */
	sym_que_init(&lp->waiting_ccbq);
	sym_que_init(&lp->started_ccbq);
	lp->started_max   = SYM_CONF_MAX_TASK;
	lp->started_limit = SYM_CONF_MAX_TASK;
#endif

fail:
	return lp;
}

/*
 *  Allocate LCB resources for tagged command queuing.
 */
static void sym_alloc_lcb_tags (struct sym_hcb *np, u_char tn, u_char ln)
{
	struct sym_tcb *tp = &np->target[tn];
	struct sym_lcb *lp = sym_lp(tp, ln);
	int i;

	/*
	 *  Allocate the task table and and the tag allocation 
	 *  circular buffer. We want both or none.
	 */
	lp->itlq_tbl = sym_calloc_dma(SYM_CONF_MAX_TASK*4, "ITLQ_TBL");
	if (!lp->itlq_tbl)
		goto fail;
	lp->cb_tags = kcalloc(SYM_CONF_MAX_TASK, 1, GFP_ATOMIC);
	if (!lp->cb_tags) {
		sym_mfree_dma(lp->itlq_tbl, SYM_CONF_MAX_TASK*4, "ITLQ_TBL");
		lp->itlq_tbl = NULL;
		goto fail;
	}

	/*
	 *  Initialize the task table with invalid entries.
	 */
	memset32(lp->itlq_tbl, cpu_to_scr(np->notask_ba), SYM_CONF_MAX_TASK);

	/*
	 *  Fill up the tag buffer with tag numbers.
	 */
	for (i = 0 ; i < SYM_CONF_MAX_TASK ; i++)
		lp->cb_tags[i] = i;

	/*
	 *  Make the task table available to SCRIPTS, 
	 *  And accept tagged commands now.
	 */
	lp->head.itlq_tbl_sa = cpu_to_scr(vtobus(lp->itlq_tbl));

	return;
fail:
	return;
}

/*
 *  Lun control block deallocation. Returns the number of valid remaining LCBs
 *  for the target.
 */
int sym_free_lcb(struct sym_hcb *np, u_char tn, u_char ln)
{
	struct sym_tcb *tp = &np->target[tn];
	struct sym_lcb *lp = sym_lp(tp, ln);

	tp->nlcb--;

	if (ln) {
		if (!tp->nlcb) {
			kfree(tp->lunmp);
			sym_mfree_dma(tp->luntbl, 256, "LUNTBL");
			tp->lunmp = NULL;
			tp->luntbl = NULL;
			tp->head.luntbl_sa = cpu_to_scr(vtobus(np->badluntbl));
		} else {
			tp->luntbl[ln] = cpu_to_scr(vtobus(&np->badlun_sa));
			tp->lunmp[ln] = NULL;
		}
	} else {
		tp->lun0p = NULL;
		tp->head.lun0_sa = cpu_to_scr(vtobus(&np->badlun_sa));
	}

	if (lp->itlq_tbl) {
		sym_mfree_dma(lp->itlq_tbl, SYM_CONF_MAX_TASK*4, "ITLQ_TBL");
		kfree(lp->cb_tags);
	}

	sym_mfree_dma(lp, sizeof(*lp), "LCB");

	return tp->nlcb;
}

/*
 *  Queue a SCSI IO to the controller.
 */
int sym_queue_scsiio(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
{
	struct scsi_device *sdev = cmd->device;
	struct sym_tcb *tp;
	struct sym_lcb *lp;
	u_char	*msgptr;
	u_int   msglen;
	int can_disconnect;

	/*
	 *  Keep track of the IO in our CCB.
	 */
	cp->cmd = cmd;

	/*
	 *  Retrieve the target descriptor.
	 */
	tp = &np->target[cp->target];

	/*
	 *  Retrieve the lun descriptor.
	 */
	lp = sym_lp(tp, sdev->lun);

	can_disconnect = (cp->tag != NO_TAG) ||
		(lp && (lp->curr_flags & SYM_DISC_ENABLED));

	msgptr = cp->scsi_smsg;
	msglen = 0;
	msgptr[msglen++] = IDENTIFY(can_disconnect, sdev->lun);

	/*
	 *  Build the tag message if present.
	 */
	if (cp->tag != NO_TAG) {
		u_char order = cp->order;

		switch(order) {
		case M_ORDERED_TAG:
			break;
		case M_HEAD_TAG:
			break;
		default:
			order = M_SIMPLE_TAG;
		}
#ifdef SYM_OPT_LIMIT_COMMAND_REORDERING
		/*
		 *  Avoid too much reordering of SCSI commands.
		 *  The algorithm tries to prevent completion of any 
		 *  tagged command from being delayed against more 
		 *  than 3 times the max number of queued commands.
		 */
		if (lp && lp->tags_since > 3*SYM_CONF_MAX_TAG) {
			lp->tags_si = !(lp->tags_si);
			if (lp->tags_sum[lp->tags_si]) {
				order = M_ORDERED_TAG;
				if ((DEBUG_FLAGS & DEBUG_TAGS)||sym_verbose>1) {
					sym_print_addr(cmd,
						"ordered tag forced.\n");
				}
			}
			lp->tags_since = 0;
		}
#endif
		msgptr[msglen++] = order;

		/*
		 *  For less than 128 tags, actual tags are numbered 
		 *  1,3,5,..2*MAXTAGS+1,since we may have to deal 
		 *  with devices that have problems with #TAG 0 or too 
		 *  great #TAG numbers. For more tags (up to 256), 
		 *  we use directly our tag number.
		 */
#if SYM_CONF_MAX_TASK > (512/4)
		msgptr[msglen++] = cp->tag;
#else
		msgptr[msglen++] = (cp->tag << 1) + 1;
#endif
	}

	/*
	 *  Build a negotiation message if needed.
	 *  (nego_status is filled by sym_prepare_nego())
	 *
	 *  Always negotiate on INQUIRY and REQUEST SENSE.
	 *
	 */
	cp->nego_status = 0;
	if ((tp->tgoal.check_nego ||
	     cmd->cmnd[0] == INQUIRY || cmd->cmnd[0] == REQUEST_SENSE) &&
	    !tp->nego_cp && lp) {
		msglen += sym_prepare_nego(np, cp, msgptr + msglen);
	}

	/*
	 *  Startqueue
	 */
	cp->phys.head.go.start   = cpu_to_scr(SCRIPTA_BA(np, select));
	cp->phys.head.go.restart = cpu_to_scr(SCRIPTA_BA(np, resel_dsa));

	/*
	 *  select
	 */
	cp->phys.select.sel_id		= cp->target;
	cp->phys.select.sel_scntl3	= tp->head.wval;
	cp->phys.select.sel_sxfer	= tp->head.sval;
	cp->phys.select.sel_scntl4	= tp->head.uval;

	/*
	 *  message
	 */
	cp->phys.smsg.addr	= CCB_BA(cp, scsi_smsg);
	cp->phys.smsg.size	= cpu_to_scr(msglen);

	/*
	 *  status
	 */
	cp->host_xflags		= 0;
	cp->host_status		= cp->nego_status ? HS_NEGOTIATE : HS_BUSY;
	cp->ssss_status		= S_ILLEGAL;
	cp->xerr_status		= 0;
	cp->host_flags		= 0;
	cp->extra_bytes		= 0;

	/*
	 *  extreme data pointer.
	 *  shall be positive, so -1 is lower than lowest.:)
	 */
	cp->ext_sg  = -1;
	cp->ext_ofs = 0;

	/*
	 *  Build the CDB and DATA descriptor block 
	 *  and start the IO.
	 */
	return sym_setup_data_and_start(np, cmd, cp);
}

/*
 *  Reset a SCSI target (all LUNs of this target).
 */
int sym_reset_scsi_target(struct sym_hcb *np, int target)
{
	struct sym_tcb *tp;

	if (target == np->myaddr || (u_int)target >= SYM_CONF_MAX_TARGET)
		return -1;

	tp = &np->target[target];
	tp->to_reset = 1;

	np->istat_sem = SEM;
	OUTB(np, nc_istat, SIGP|SEM);

	return 0;
}

/*
 *  Abort a SCSI IO.
 */
static int sym_abort_ccb(struct sym_hcb *np, struct sym_ccb *cp, int timed_out)
{
	/*
	 *  Check that the IO is active.
	 */
	if (!cp || !cp->host_status || cp->host_status == HS_WAIT)
		return -1;

	/*
	 *  If a previous abort didn't succeed in time,
	 *  perform a BUS reset.
	 */
	if (cp->to_abort) {
		sym_reset_scsi_bus(np, 1);
		return 0;
	}

	/*
	 *  Mark the CCB for abort and allow time for.
	 */
	cp->to_abort = timed_out ? 2 : 1;

	/*
	 *  Tell the SCRIPTS processor to stop and synchronize with us.
	 */
	np->istat_sem = SEM;
	OUTB(np, nc_istat, SIGP|SEM);
	return 0;
}

int sym_abort_scsiio(struct sym_hcb *np, struct scsi_cmnd *cmd, int timed_out)
{
	struct sym_ccb *cp;
	SYM_QUEHEAD *qp;

	/*
	 *  Look up our CCB control block.
	 */
	cp = NULL;
	FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
		struct sym_ccb *cp2 = sym_que_entry(qp, struct sym_ccb, link_ccbq);
		if (cp2->cmd == cmd) {
			cp = cp2;
			break;
		}
	}

	return sym_abort_ccb(np, cp, timed_out);
}

/*
 *  Complete execution of a SCSI command with extended 
 *  error, SCSI status error, or having been auto-sensed.
 *
 *  The SCRIPTS processor is not running there, so we 
 *  can safely access IO registers and remove JOBs from  
 *  the START queue.
 *  SCRATCHA is assumed to have been loaded with STARTPOS 
 *  before the SCRIPTS called the C code.
 */
void sym_complete_error(struct sym_hcb *np, struct sym_ccb *cp)
{
	struct scsi_device *sdev;
	struct scsi_cmnd *cmd;
	struct sym_tcb *tp;
	struct sym_lcb *lp;
	int resid;
	int i;

	/*
	 *  Paranoid check. :)
	 */
	if (!cp || !cp->cmd)
		return;

	cmd = cp->cmd;
	sdev = cmd->device;
	if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_RESULT)) {
		dev_info(&sdev->sdev_gendev, "CCB=%p STAT=%x/%x/%x\n", cp,
			cp->host_status, cp->ssss_status, cp->host_flags);
	}

	/*
	 *  Get target and lun pointers.
	 */
	tp = &np->target[cp->target];
	lp = sym_lp(tp, sdev->lun);

	/*
	 *  Check for extended errors.
	 */
	if (cp->xerr_status) {
		if (sym_verbose)
			sym_print_xerr(cmd, cp->xerr_status);
		if (cp->host_status == HS_COMPLETE)
			cp->host_status = HS_COMP_ERR;
	}

	/*
	 *  Calculate the residual.
	 */
	resid = sym_compute_residual(np, cp);

	if (!SYM_SETUP_RESIDUAL_SUPPORT) {/* If user does not want residuals */
		resid  = 0;		 /* throw them away. :)		    */
		cp->sv_resid = 0;
	}
#ifdef DEBUG_2_0_X
if (resid)
	printf("XXXX RESID= %d - 0x%x\n", resid, resid);
#endif

	/*
	 *  Dequeue all queued CCBs for that device 
	 *  not yet started by SCRIPTS.
	 */
	i = (INL(np, nc_scratcha) - np->squeue_ba) / 4;
	i = sym_dequeue_from_squeue(np, i, cp->target, sdev->lun, -1);

	/*
	 *  Restart the SCRIPTS processor.
	 */
	OUTL_DSP(np, SCRIPTA_BA(np, start));

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	if (cp->host_status == HS_COMPLETE &&
	    cp->ssss_status == S_QUEUE_FULL) {
		if (!lp || lp->started_tags - i < 2)
			goto weirdness;
		/*
		 *  Decrease queue depth as needed.
		 */
		lp->started_max = lp->started_tags - i - 1;
		lp->num_sgood = 0;

		if (sym_verbose >= 2) {
			sym_print_addr(cmd, " queue depth is now %d\n",
					lp->started_max);
		}

		/*
		 *  Repair the CCB.
		 */
		cp->host_status = HS_BUSY;
		cp->ssss_status = S_ILLEGAL;

		/*
		 *  Let's requeue it to device.
		 */
		sym_set_cam_status(cmd, DID_SOFT_ERROR);
		goto finish;
	}
weirdness:
#endif
	/*
	 *  Build result in CAM ccb.
	 */
	sym_set_cam_result_error(np, cp, resid);

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
finish:
#endif
	/*
	 *  Add this one to the COMP queue.
	 */
	sym_remque(&cp->link_ccbq);
	sym_insque_head(&cp->link_ccbq, &np->comp_ccbq);

	/*
	 *  Complete all those commands with either error 
	 *  or requeue condition.
	 */
	sym_flush_comp_queue(np, 0);

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	/*
	 *  Donnot start more than 1 command after an error.
	 */
	sym_start_next_ccbs(np, lp, 1);
#endif
}

/*
 *  Complete execution of a successful SCSI command.
 *
 *  Only successful commands go to the DONE queue, 
 *  since we need to have the SCRIPTS processor 
 *  stopped on any error condition.
 *  The SCRIPTS processor is running while we are 
 *  completing successful commands.
 */
void sym_complete_ok (struct sym_hcb *np, struct sym_ccb *cp)
{
	struct sym_tcb *tp;
	struct sym_lcb *lp;
	struct scsi_cmnd *cmd;
	int resid;

	/*
	 *  Paranoid check. :)
	 */
	if (!cp || !cp->cmd)
		return;
	assert (cp->host_status == HS_COMPLETE);

	/*
	 *  Get user command.
	 */
	cmd = cp->cmd;

	/*
	 *  Get target and lun pointers.
	 */
	tp = &np->target[cp->target];
	lp = sym_lp(tp, cp->lun);

	/*
	 *  If all data have been transferred, given than no
	 *  extended error did occur, there is no residual.
	 */
	resid = 0;
	if (cp->phys.head.lastp != cp->goalp)
		resid = sym_compute_residual(np, cp);

	/*
	 *  Wrong transfer residuals may be worse than just always 
	 *  returning zero. User can disable this feature in 
	 *  sym53c8xx.h. Residual support is enabled by default.
	 */
	if (!SYM_SETUP_RESIDUAL_SUPPORT)
		resid  = 0;
#ifdef DEBUG_2_0_X
if (resid)
	printf("XXXX RESID= %d - 0x%x\n", resid, resid);
#endif

	/*
	 *  Build result in CAM ccb.
	 */
	sym_set_cam_result_ok(cp, cmd, resid);

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	/*
	 *  If max number of started ccbs had been reduced,
	 *  increase it if 200 good status received.
	 */
	if (lp && lp->started_max < lp->started_limit) {
		++lp->num_sgood;
		if (lp->num_sgood >= 200) {
			lp->num_sgood = 0;
			++lp->started_max;
			if (sym_verbose >= 2) {
				sym_print_addr(cmd, " queue depth is now %d\n",
				       lp->started_max);
			}
		}
	}
#endif

	/*
	 *  Free our CCB.
	 */
	sym_free_ccb (np, cp);

#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	/*
	 *  Requeue a couple of awaiting scsi commands.
	 */
	if (!sym_que_empty(&lp->waiting_ccbq))
		sym_start_next_ccbs(np, lp, 2);
#endif
	/*
	 *  Complete the command.
	 */
	sym_xpt_done(np, cmd);
}

/*
 *  Soft-attach the controller.
 */
int sym_hcb_attach(struct Scsi_Host *shost, struct sym_fw *fw, struct sym_nvram *nvram)
{
	struct sym_hcb *np = sym_get_hcb(shost);
	int i;

	/*
	 *  Get some info about the firmware.
	 */
	np->scripta_sz	 = fw->a_size;
	np->scriptb_sz	 = fw->b_size;
	np->scriptz_sz	 = fw->z_size;
	np->fw_setup	 = fw->setup;
	np->fw_patch	 = fw->patch;
	np->fw_name	 = fw->name;

	/*
	 *  Save setting of some IO registers, so we will 
	 *  be able to probe specific implementations.
	 */
	sym_save_initial_setting (np);

	/*
	 *  Reset the chip now, since it has been reported 
	 *  that SCSI clock calibration may not work properly 
	 *  if the chip is currently active.
	 */
	sym_chip_reset(np);

	/*
	 *  Prepare controller and devices settings, according 
	 *  to chip features, user set-up and driver set-up.
	 */
	sym_prepare_setting(shost, np, nvram);

	/*
	 *  Check the PCI clock frequency.
	 *  Must be performed after prepare_setting since it destroys 
	 *  STEST1 that is used to probe for the clock doubler.
	 */
	i = sym_getpciclock(np);
	if (i > 37000 && !(np->features & FE_66MHZ))
		printf("%s: PCI BUS clock seems too high: %u KHz.\n",
			sym_name(np), i);

	/*
	 *  Allocate the start queue.
	 */
	np->squeue = sym_calloc_dma(sizeof(u32)*(MAX_QUEUE*2),"SQUEUE");
	if (!np->squeue)
		goto attach_failed;
	np->squeue_ba = vtobus(np->squeue);

	/*
	 *  Allocate the done queue.
	 */
	np->dqueue = sym_calloc_dma(sizeof(u32)*(MAX_QUEUE*2),"DQUEUE");
	if (!np->dqueue)
		goto attach_failed;
	np->dqueue_ba = vtobus(np->dqueue);

	/*
	 *  Allocate the target bus address array.
	 */
	np->targtbl = sym_calloc_dma(256, "TARGTBL");
	if (!np->targtbl)
		goto attach_failed;
	np->targtbl_ba = vtobus(np->targtbl);

	/*
	 *  Allocate SCRIPTS areas.
	 */
	np->scripta0 = sym_calloc_dma(np->scripta_sz, "SCRIPTA0");
	np->scriptb0 = sym_calloc_dma(np->scriptb_sz, "SCRIPTB0");
	np->scriptz0 = sym_calloc_dma(np->scriptz_sz, "SCRIPTZ0");
	if (!np->scripta0 || !np->scriptb0 || !np->scriptz0)
		goto attach_failed;

	/*
	 *  Allocate the array of lists of CCBs hashed by DSA.
	 */
	np->ccbh = kcalloc(CCB_HASH_SIZE, sizeof(struct sym_ccb **), GFP_KERNEL);
	if (!np->ccbh)
		goto attach_failed;

	/*
	 *  Initialyze the CCB free and busy queues.
	 */
	sym_que_init(&np->free_ccbq);
	sym_que_init(&np->busy_ccbq);
	sym_que_init(&np->comp_ccbq);

	/*
	 *  Initialization for optional handling 
	 *  of device queueing.
	 */
#ifdef SYM_OPT_HANDLE_DEVICE_QUEUEING
	sym_que_init(&np->dummy_ccbq);
#endif
	/*
	 *  Allocate some CCB. We need at least ONE.
	 */
	if (!sym_alloc_ccb(np))
		goto attach_failed;

	/*
	 *  Calculate BUS addresses where we are going 
	 *  to load the SCRIPTS.
	 */
	np->scripta_ba	= vtobus(np->scripta0);
	np->scriptb_ba	= vtobus(np->scriptb0);
	np->scriptz_ba	= vtobus(np->scriptz0);

	if (np->ram_ba) {
		np->scripta_ba = np->ram_ba;
		if (np->features & FE_RAM8K) {
			np->scriptb_ba = np->scripta_ba + 4096;
#if 0	/* May get useful for 64 BIT PCI addressing */
			np->scr_ram_seg = cpu_to_scr(np->scripta_ba >> 32);
#endif
		}
	}

	/*
	 *  Copy scripts to controller instance.
	 */
	memcpy(np->scripta0, fw->a_base, np->scripta_sz);
	memcpy(np->scriptb0, fw->b_base, np->scriptb_sz);
	memcpy(np->scriptz0, fw->z_base, np->scriptz_sz);

	/*
	 *  Setup variable parts in scripts and compute
	 *  scripts bus addresses used from the C code.
	 */
	np->fw_setup(np, fw);

	/*
	 *  Bind SCRIPTS with physical addresses usable by the 
	 *  SCRIPTS processor (as seen from the BUS = BUS addresses).
	 */
	sym_fw_bind_script(np, (u32 *) np->scripta0, np->scripta_sz);
	sym_fw_bind_script(np, (u32 *) np->scriptb0, np->scriptb_sz);
	sym_fw_bind_script(np, (u32 *) np->scriptz0, np->scriptz_sz);

#ifdef SYM_CONF_IARB_SUPPORT
	/*
	 *    If user wants IARB to be set when we win arbitration 
	 *    and have other jobs, compute the max number of consecutive 
	 *    settings of IARB hints before we leave devices a chance to 
	 *    arbitrate for reselection.
	 */
#ifdef	SYM_SETUP_IARB_MAX
	np->iarb_max = SYM_SETUP_IARB_MAX;
#else
	np->iarb_max = 4;
#endif
#endif

	/*
	 *  Prepare the idle and invalid task actions.
	 */
	np->idletask.start	= cpu_to_scr(SCRIPTA_BA(np, idle));
	np->idletask.restart	= cpu_to_scr(SCRIPTB_BA(np, bad_i_t_l));
	np->idletask_ba		= vtobus(&np->idletask);

	np->notask.start	= cpu_to_scr(SCRIPTA_BA(np, idle));
	np->notask.restart	= cpu_to_scr(SCRIPTB_BA(np, bad_i_t_l));
	np->notask_ba		= vtobus(&np->notask);

	np->bad_itl.start	= cpu_to_scr(SCRIPTA_BA(np, idle));
	np->bad_itl.restart	= cpu_to_scr(SCRIPTB_BA(np, bad_i_t_l));
	np->bad_itl_ba		= vtobus(&np->bad_itl);

	np->bad_itlq.start	= cpu_to_scr(SCRIPTA_BA(np, idle));
	np->bad_itlq.restart	= cpu_to_scr(SCRIPTB_BA(np,bad_i_t_l_q));
	np->bad_itlq_ba		= vtobus(&np->bad_itlq);

	/*
	 *  Allocate and prepare the lun JUMP table that is used 
	 *  for a target prior the probing of devices (bad lun table).
	 *  A private table will be allocated for the target on the 
	 *  first INQUIRY response received.
	 */
	np->badluntbl = sym_calloc_dma(256, "BADLUNTBL");
	if (!np->badluntbl)
		goto attach_failed;

	np->badlun_sa = cpu_to_scr(SCRIPTB_BA(np, resel_bad_lun));
	memset32(np->badluntbl, cpu_to_scr(vtobus(&np->badlun_sa)), 64);

	/*
	 *  Prepare the bus address array that contains the bus 
	 *  address of each target control block.
	 *  For now, assume all logical units are wrong. :)
	 */
	for (i = 0 ; i < SYM_CONF_MAX_TARGET ; i++) {
		np->targtbl[i] = cpu_to_scr(vtobus(&np->target[i]));
		np->target[i].head.luntbl_sa =
				cpu_to_scr(vtobus(np->badluntbl));
		np->target[i].head.lun0_sa =
				cpu_to_scr(vtobus(&np->badlun_sa));
	}

	/*
	 *  Now check the cache handling of the pci chipset.
	 */
	if (sym_snooptest (np)) {
		printf("%s: CACHE INCORRECTLY CONFIGURED.\n", sym_name(np));
		goto attach_failed;
	}

	/*
	 *  Sigh! we are done.
	 */
	return 0;

attach_failed:
	return -ENXIO;
}

/*
 *  Free everything that has been allocated for this device.
 */
void sym_hcb_free(struct sym_hcb *np)
{
	SYM_QUEHEAD *qp;
	struct sym_ccb *cp;
	struct sym_tcb *tp;
	int target;

	if (np->scriptz0)
		sym_mfree_dma(np->scriptz0, np->scriptz_sz, "SCRIPTZ0");
	if (np->scriptb0)
		sym_mfree_dma(np->scriptb0, np->scriptb_sz, "SCRIPTB0");
	if (np->scripta0)
		sym_mfree_dma(np->scripta0, np->scripta_sz, "SCRIPTA0");
	if (np->squeue)
		sym_mfree_dma(np->squeue, sizeof(u32)*(MAX_QUEUE*2), "SQUEUE");
	if (np->dqueue)
		sym_mfree_dma(np->dqueue, sizeof(u32)*(MAX_QUEUE*2), "DQUEUE");

	if (np->actccbs) {
		while ((qp = sym_remque_head(&np->free_ccbq)) != NULL) {
			cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
			sym_mfree_dma(cp, sizeof(*cp), "CCB");
		}
	}
	kfree(np->ccbh);

	if (np->badluntbl)
		sym_mfree_dma(np->badluntbl, 256,"BADLUNTBL");

	for (target = 0; target < SYM_CONF_MAX_TARGET ; target++) {
		tp = &np->target[target];
		if (tp->luntbl)
			sym_mfree_dma(tp->luntbl, 256, "LUNTBL");
#if SYM_CONF_MAX_LUN > 1
		kfree(tp->lunmp);
#endif 
	}
	if (np->targtbl)
		sym_mfree_dma(np->targtbl, 256, "TARGTBL");
}