aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/fddi/defxx.c
blob: 0b40e1c46f07a15a32ab4ba17c54e610e1ccd64e (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
/*
 * File Name:
 *   defxx.c
 *
 * Copyright Information:
 *   Copyright Digital Equipment Corporation 1996.
 *
 *   This software may be used and distributed according to the terms of
 *   the GNU General Public License, incorporated herein by reference.
 *
 * Abstract:
 *   A Linux device driver supporting the Digital Equipment Corporation
 *   FDDI TURBOchannel, EISA and PCI controller families.  Supported
 *   adapters include:
 *
 *		DEC FDDIcontroller/TURBOchannel (DEFTA)
 *		DEC FDDIcontroller/EISA         (DEFEA)
 *		DEC FDDIcontroller/PCI          (DEFPA)
 *
 * The original author:
 *   LVS	Lawrence V. Stefani <lstefani@yahoo.com>
 *
 * Maintainers:
 *   macro	Maciej W. Rozycki <macro@linux-mips.org>
 *
 * Credits:
 *   I'd like to thank Patricia Cross for helping me get started with
 *   Linux, David Davies for a lot of help upgrading and configuring
 *   my development system and for answering many OS and driver
 *   development questions, and Alan Cox for recommendations and
 *   integration help on getting FDDI support into Linux.  LVS
 *
 * Driver Architecture:
 *   The driver architecture is largely based on previous driver work
 *   for other operating systems.  The upper edge interface and
 *   functions were largely taken from existing Linux device drivers
 *   such as David Davies' DE4X5.C driver and Donald Becker's TULIP.C
 *   driver.
 *
 *   Adapter Probe -
 *		The driver scans for supported EISA adapters by reading the
 *		SLOT ID register for each EISA slot and making a match
 *		against the expected value.
 *
 *   Bus-Specific Initialization -
 *		This driver currently supports both EISA and PCI controller
 *		families.  While the custom DMA chip and FDDI logic is similar
 *		or identical, the bus logic is very different.  After
 *		initialization, the	only bus-specific differences is in how the
 *		driver enables and disables interrupts.  Other than that, the
 *		run-time critical code behaves the same on both families.
 *		It's important to note that both adapter families are configured
 *		to I/O map, rather than memory map, the adapter registers.
 *
 *   Driver Open/Close -
 *		In the driver open routine, the driver ISR (interrupt service
 *		routine) is registered and the adapter is brought to an
 *		operational state.  In the driver close routine, the opposite
 *		occurs; the driver ISR is deregistered and the adapter is
 *		brought to a safe, but closed state.  Users may use consecutive
 *		commands to bring the adapter up and down as in the following
 *		example:
 *					ifconfig fddi0 up
 *					ifconfig fddi0 down
 *					ifconfig fddi0 up
 *
 *   Driver Shutdown -
 *		Apparently, there is no shutdown or halt routine support under
 *		Linux.  This routine would be called during "reboot" or
 *		"shutdown" to allow the driver to place the adapter in a safe
 *		state before a warm reboot occurs.  To be really safe, the user
 *		should close the adapter before shutdown (eg. ifconfig fddi0 down)
 *		to ensure that the adapter DMA engine is taken off-line.  However,
 *		the current driver code anticipates this problem and always issues
 *		a soft reset of the adapter	at the beginning of driver initialization.
 *		A future driver enhancement in this area may occur in 2.1.X where
 *		Alan indicated that a shutdown handler may be implemented.
 *
 *   Interrupt Service Routine -
 *		The driver supports shared interrupts, so the ISR is registered for
 *		each board with the appropriate flag and the pointer to that board's
 *		device structure.  This provides the context during interrupt
 *		processing to support shared interrupts and multiple boards.
 *
 *		Interrupt enabling/disabling can occur at many levels.  At the host
 *		end, you can disable system interrupts, or disable interrupts at the
 *		PIC (on Intel systems).  Across the bus, both EISA and PCI adapters
 *		have a bus-logic chip interrupt enable/disable as well as a DMA
 *		controller interrupt enable/disable.
 *
 *		The driver currently enables and disables adapter interrupts at the
 *		bus-logic chip and assumes that Linux will take care of clearing or
 *		acknowledging any host-based interrupt chips.
 *
 *   Control Functions -
 *		Control functions are those used to support functions such as adding
 *		or deleting multicast addresses, enabling or disabling packet
 *		reception filters, or other custom/proprietary commands.  Presently,
 *		the driver supports the "get statistics", "set multicast list", and
 *		"set mac address" functions defined by Linux.  A list of possible
 *		enhancements include:
 *
 *				- Custom ioctl interface for executing port interface commands
 *				- Custom ioctl interface for adding unicast addresses to
 *				  adapter CAM (to support bridge functions).
 *				- Custom ioctl interface for supporting firmware upgrades.
 *
 *   Hardware (port interface) Support Routines -
 *		The driver function names that start with "dfx_hw_" represent
 *		low-level port interface routines that are called frequently.  They
 *		include issuing a DMA or port control command to the adapter,
 *		resetting the adapter, or reading the adapter state.  Since the
 *		driver initialization and run-time code must make calls into the
 *		port interface, these routines were written to be as generic and
 *		usable as possible.
 *
 *   Receive Path -
 *		The adapter DMA engine supports a 256 entry receive descriptor block
 *		of which up to 255 entries can be used at any given time.  The
 *		architecture is a standard producer, consumer, completion model in
 *		which the driver "produces" receive buffers to the adapter, the
 *		adapter "consumes" the receive buffers by DMAing incoming packet data,
 *		and the driver "completes" the receive buffers by servicing the
 *		incoming packet, then "produces" a new buffer and starts the cycle
 *		again.  Receive buffers can be fragmented in up to 16 fragments
 *		(descriptor	entries).  For simplicity, this driver posts
 *		single-fragment receive buffers of 4608 bytes, then allocates a
 *		sk_buff, copies the data, then reposts the buffer.  To reduce CPU
 *		utilization, a better approach would be to pass up the receive
 *		buffer (no extra copy) then allocate and post a replacement buffer.
 *		This is a performance enhancement that should be looked into at
 *		some point.
 *
 *   Transmit Path -
 *		Like the receive path, the adapter DMA engine supports a 256 entry
 *		transmit descriptor block of which up to 255 entries can be used at
 *		any	given time.  Transmit buffers can be fragmented	in up to 255
 *		fragments (descriptor entries).  This driver always posts one
 *		fragment per transmit packet request.
 *
 *		The fragment contains the entire packet from FC to end of data.
 *		Before posting the buffer to the adapter, the driver sets a three-byte
 *		packet request header (PRH) which is required by the Motorola MAC chip
 *		used on the adapters.  The PRH tells the MAC the type of token to
 *		receive/send, whether or not to generate and append the CRC, whether
 *		synchronous or asynchronous framing is used, etc.  Since the PRH
 *		definition is not necessarily consistent across all FDDI chipsets,
 *		the driver, rather than the common FDDI packet handler routines,
 *		sets these bytes.
 *
 *		To reduce the amount of descriptor fetches needed per transmit request,
 *		the driver takes advantage of the fact that there are at least three
 *		bytes available before the skb->data field on the outgoing transmit
 *		request.  This is guaranteed by having fddi_setup() in net_init.c set
 *		dev->hard_header_len to 24 bytes.  21 bytes accounts for the largest
 *		header in an 802.2 SNAP frame.  The other 3 bytes are the extra "pad"
 *		bytes which we'll use to store the PRH.
 *
 *		There's a subtle advantage to adding these pad bytes to the
 *		hard_header_len, it ensures that the data portion of the packet for
 *		an 802.2 SNAP frame is longword aligned.  Other FDDI driver
 *		implementations may not need the extra padding and can start copying
 *		or DMAing directly from the FC byte which starts at skb->data.  Should
 *		another driver implementation need ADDITIONAL padding, the net_init.c
 *		module should be updated and dev->hard_header_len should be increased.
 *		NOTE: To maintain the alignment on the data portion of the packet,
 *		dev->hard_header_len should always be evenly divisible by 4 and at
 *		least 24 bytes in size.
 *
 * Modification History:
 *		Date		Name	Description
 *		16-Aug-96	LVS		Created.
 *		20-Aug-96	LVS		Updated dfx_probe so that version information
 *							string is only displayed if 1 or more cards are
 *							found.  Changed dfx_rcv_queue_process to copy
 *							3 NULL bytes before FC to ensure that data is
 *							longword aligned in receive buffer.
 *		09-Sep-96	LVS		Updated dfx_ctl_set_multicast_list to enable
 *							LLC group promiscuous mode if multicast list
 *							is too large.  LLC individual/group promiscuous
 *							mode is now disabled if IFF_PROMISC flag not set.
 *							dfx_xmt_queue_pkt no longer checks for NULL skb
 *							on Alan Cox recommendation.  Added node address
 *							override support.
 *		12-Sep-96	LVS		Reset current address to factory address during
 *							device open.  Updated transmit path to post a
 *							single fragment which includes PRH->end of data.
 *		Mar 2000	AC		Did various cleanups for 2.3.x
 *		Jun 2000	jgarzik		PCI and resource alloc cleanups
 *		Jul 2000	tjeerd		Much cleanup and some bug fixes
 *		Sep 2000	tjeerd		Fix leak on unload, cosmetic code cleanup
 *		Feb 2001			Skb allocation fixes
 *		Feb 2001	davej		PCI enable cleanups.
 *		04 Aug 2003	macro		Converted to the DMA API.
 *		14 Aug 2004	macro		Fix device names reported.
 *		14 Jun 2005	macro		Use irqreturn_t.
 *		23 Oct 2006	macro		Big-endian host support.
 *		14 Dec 2006	macro		TURBOchannel support.
 */

/* Include files */
#include <linux/bitops.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/eisa.h>
#include <linux/errno.h>
#include <linux/fddidevice.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tc.h>

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

#include "defxx.h"

/* Version information string should be updated prior to each new release!  */
#define DRV_NAME "defxx"
#define DRV_VERSION "v1.10"
#define DRV_RELDATE "2006/12/14"

static char version[] =
	DRV_NAME ": " DRV_VERSION " " DRV_RELDATE
	"  Lawrence V. Stefani and others\n";

#define DYNAMIC_BUFFERS 1

#define SKBUFF_RX_COPYBREAK 200
/*
 * NEW_SKB_SIZE = PI_RCV_DATA_K_SIZE_MAX+128 to allow 128 byte
 * alignment for compatibility with old EISA boards.
 */
#define NEW_SKB_SIZE (PI_RCV_DATA_K_SIZE_MAX+128)

#ifdef CONFIG_PCI
#define DFX_BUS_PCI(dev) (dev->bus == &pci_bus_type)
#else
#define DFX_BUS_PCI(dev) 0
#endif

#ifdef CONFIG_EISA
#define DFX_BUS_EISA(dev) (dev->bus == &eisa_bus_type)
#else
#define DFX_BUS_EISA(dev) 0
#endif

#ifdef CONFIG_TC
#define DFX_BUS_TC(dev) (dev->bus == &tc_bus_type)
#else
#define DFX_BUS_TC(dev) 0
#endif

#ifdef CONFIG_DEFXX_MMIO
#define DFX_MMIO 1
#else
#define DFX_MMIO 0
#endif

/* Define module-wide (static) routines */

static void		dfx_bus_init(struct net_device *dev);
static void		dfx_bus_uninit(struct net_device *dev);
static void		dfx_bus_config_check(DFX_board_t *bp);

static int		dfx_driver_init(struct net_device *dev,
					const char *print_name,
					resource_size_t bar_start);
static int		dfx_adap_init(DFX_board_t *bp, int get_buffers);

static int		dfx_open(struct net_device *dev);
static int		dfx_close(struct net_device *dev);

static void		dfx_int_pr_halt_id(DFX_board_t *bp);
static void		dfx_int_type_0_process(DFX_board_t *bp);
static void		dfx_int_common(struct net_device *dev);
static irqreturn_t	dfx_interrupt(int irq, void *dev_id);

static struct		net_device_stats *dfx_ctl_get_stats(struct net_device *dev);
static void		dfx_ctl_set_multicast_list(struct net_device *dev);
static int		dfx_ctl_set_mac_address(struct net_device *dev, void *addr);
static int		dfx_ctl_update_cam(DFX_board_t *bp);
static int		dfx_ctl_update_filters(DFX_board_t *bp);

static int		dfx_hw_dma_cmd_req(DFX_board_t *bp);
static int		dfx_hw_port_ctrl_req(DFX_board_t *bp, PI_UINT32	command, PI_UINT32 data_a, PI_UINT32 data_b, PI_UINT32 *host_data);
static void		dfx_hw_adap_reset(DFX_board_t *bp, PI_UINT32 type);
static int		dfx_hw_adap_state_rd(DFX_board_t *bp);
static int		dfx_hw_dma_uninit(DFX_board_t *bp, PI_UINT32 type);

static int		dfx_rcv_init(DFX_board_t *bp, int get_buffers);
static void		dfx_rcv_queue_process(DFX_board_t *bp);
static void		dfx_rcv_flush(DFX_board_t *bp);

static netdev_tx_t dfx_xmt_queue_pkt(struct sk_buff *skb,
				     struct net_device *dev);
static int		dfx_xmt_done(DFX_board_t *bp);
static void		dfx_xmt_flush(DFX_board_t *bp);

/* Define module-wide (static) variables */

static struct pci_driver dfx_pci_driver;
static struct eisa_driver dfx_eisa_driver;
static struct tc_driver dfx_tc_driver;


/*
 * =======================
 * = dfx_port_write_long =
 * = dfx_port_read_long  =
 * =======================
 *
 * Overview:
 *   Routines for reading and writing values from/to adapter
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp		- pointer to board information
 *   offset	- register offset from base I/O address
 *   data	- for dfx_port_write_long, this is a value to write;
 *		  for dfx_port_read_long, this is a pointer to store
 *		  the read value
 *
 * Functional Description:
 *   These routines perform the correct operation to read or write
 *   the adapter register.
 *
 *   EISA port block base addresses are based on the slot number in which the
 *   controller is installed.  For example, if the EISA controller is installed
 *   in slot 4, the port block base address is 0x4000.  If the controller is
 *   installed in slot 2, the port block base address is 0x2000, and so on.
 *   This port block can be used to access PDQ, ESIC, and DEFEA on-board
 *   registers using the register offsets defined in DEFXX.H.
 *
 *   PCI port block base addresses are assigned by the PCI BIOS or system
 *   firmware.  There is one 128 byte port block which can be accessed.  It
 *   allows for I/O mapping of both PDQ and PFI registers using the register
 *   offsets defined in DEFXX.H.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   bp->base is a valid base I/O address for this adapter.
 *   offset is a valid register offset for this adapter.
 *
 * Side Effects:
 *   Rather than produce macros for these functions, these routines
 *   are defined using "inline" to ensure that the compiler will
 *   generate inline code and not waste a procedure call and return.
 *   This provides all the benefits of macros, but with the
 *   advantage of strict data type checking.
 */

static inline void dfx_writel(DFX_board_t *bp, int offset, u32 data)
{
	writel(data, bp->base.mem + offset);
	mb();
}

static inline void dfx_outl(DFX_board_t *bp, int offset, u32 data)
{
	outl(data, bp->base.port + offset);
}

static void dfx_port_write_long(DFX_board_t *bp, int offset, u32 data)
{
	struct device __maybe_unused *bdev = bp->bus_dev;
	int dfx_bus_tc = DFX_BUS_TC(bdev);
	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;

	if (dfx_use_mmio)
		dfx_writel(bp, offset, data);
	else
		dfx_outl(bp, offset, data);
}


static inline void dfx_readl(DFX_board_t *bp, int offset, u32 *data)
{
	mb();
	*data = readl(bp->base.mem + offset);
}

static inline void dfx_inl(DFX_board_t *bp, int offset, u32 *data)
{
	*data = inl(bp->base.port + offset);
}

static void dfx_port_read_long(DFX_board_t *bp, int offset, u32 *data)
{
	struct device __maybe_unused *bdev = bp->bus_dev;
	int dfx_bus_tc = DFX_BUS_TC(bdev);
	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;

	if (dfx_use_mmio)
		dfx_readl(bp, offset, data);
	else
		dfx_inl(bp, offset, data);
}


/*
 * ================
 * = dfx_get_bars =
 * ================
 *
 * Overview:
 *   Retrieves the address range used to access control and status
 *   registers.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bdev	- pointer to device information
 *   bar_start	- pointer to store the start address
 *   bar_len	- pointer to store the length of the area
 *
 * Assumptions:
 *   I am sure there are some.
 *
 * Side Effects:
 *   None
 */
static void dfx_get_bars(struct device *bdev,
			 resource_size_t *bar_start, resource_size_t *bar_len)
{
	int dfx_bus_pci = DFX_BUS_PCI(bdev);
	int dfx_bus_eisa = DFX_BUS_EISA(bdev);
	int dfx_bus_tc = DFX_BUS_TC(bdev);
	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;

	if (dfx_bus_pci) {
		int num = dfx_use_mmio ? 0 : 1;

		*bar_start = pci_resource_start(to_pci_dev(bdev), num);
		*bar_len = pci_resource_len(to_pci_dev(bdev), num);
	}
	if (dfx_bus_eisa) {
		unsigned long base_addr = to_eisa_device(bdev)->base_addr;
		resource_size_t bar;

		if (dfx_use_mmio) {
			bar = inb(base_addr + PI_ESIC_K_MEM_ADD_CMP_2);
			bar <<= 8;
			bar |= inb(base_addr + PI_ESIC_K_MEM_ADD_CMP_1);
			bar <<= 8;
			bar |= inb(base_addr + PI_ESIC_K_MEM_ADD_CMP_0);
			bar <<= 16;
			*bar_start = bar;
			bar = inb(base_addr + PI_ESIC_K_MEM_ADD_MASK_2);
			bar <<= 8;
			bar |= inb(base_addr + PI_ESIC_K_MEM_ADD_MASK_1);
			bar <<= 8;
			bar |= inb(base_addr + PI_ESIC_K_MEM_ADD_MASK_0);
			bar <<= 16;
			*bar_len = (bar | PI_MEM_ADD_MASK_M) + 1;
		} else {
			*bar_start = base_addr;
			*bar_len = PI_ESIC_K_CSR_IO_LEN;
		}
	}
	if (dfx_bus_tc) {
		*bar_start = to_tc_dev(bdev)->resource.start +
			     PI_TC_K_CSR_OFFSET;
		*bar_len = PI_TC_K_CSR_LEN;
	}
}

static const struct net_device_ops dfx_netdev_ops = {
	.ndo_open		= dfx_open,
	.ndo_stop		= dfx_close,
	.ndo_start_xmit		= dfx_xmt_queue_pkt,
	.ndo_get_stats		= dfx_ctl_get_stats,
	.ndo_set_rx_mode	= dfx_ctl_set_multicast_list,
	.ndo_set_mac_address	= dfx_ctl_set_mac_address,
};

/*
 * ================
 * = dfx_register =
 * ================
 *
 * Overview:
 *   Initializes a supported FDDI controller
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   bdev - pointer to device information
 *
 * Functional Description:
 *
 * Return Codes:
 *   0		 - This device (fddi0, fddi1, etc) configured successfully
 *   -EBUSY      - Failed to get resources, or dfx_driver_init failed.
 *
 * Assumptions:
 *   It compiles so it should work :-( (PCI cards do :-)
 *
 * Side Effects:
 *   Device structures for FDDI adapters (fddi0, fddi1, etc) are
 *   initialized and the board resources are read and stored in
 *   the device structure.
 */
static int dfx_register(struct device *bdev)
{
	static int version_disp;
	int dfx_bus_pci = DFX_BUS_PCI(bdev);
	int dfx_bus_tc = DFX_BUS_TC(bdev);
	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;
	const char *print_name = dev_name(bdev);
	struct net_device *dev;
	DFX_board_t	  *bp;			/* board pointer */
	resource_size_t bar_start = 0;		/* pointer to port */
	resource_size_t bar_len = 0;		/* resource length */
	int alloc_size;				/* total buffer size used */
	struct resource *region;
	int err = 0;

	if (!version_disp) {	/* display version info if adapter is found */
		version_disp = 1;	/* set display flag to TRUE so that */
		printk(version);	/* we only display this string ONCE */
	}

	dev = alloc_fddidev(sizeof(*bp));
	if (!dev) {
		printk(KERN_ERR "%s: Unable to allocate fddidev, aborting\n",
		       print_name);
		return -ENOMEM;
	}

	/* Enable PCI device. */
	if (dfx_bus_pci && pci_enable_device(to_pci_dev(bdev))) {
		printk(KERN_ERR "%s: Cannot enable PCI device, aborting\n",
		       print_name);
		goto err_out;
	}

	SET_NETDEV_DEV(dev, bdev);

	bp = netdev_priv(dev);
	bp->bus_dev = bdev;
	dev_set_drvdata(bdev, dev);

	dfx_get_bars(bdev, &bar_start, &bar_len);

	if (dfx_use_mmio)
		region = request_mem_region(bar_start, bar_len, print_name);
	else
		region = request_region(bar_start, bar_len, print_name);
	if (!region) {
		printk(KERN_ERR "%s: Cannot reserve I/O resource "
		       "0x%lx @ 0x%lx, aborting\n",
		       print_name, (long)bar_len, (long)bar_start);
		err = -EBUSY;
		goto err_out_disable;
	}

	/* Set up I/O base address. */
	if (dfx_use_mmio) {
		bp->base.mem = ioremap_nocache(bar_start, bar_len);
		if (!bp->base.mem) {
			printk(KERN_ERR "%s: Cannot map MMIO\n", print_name);
			err = -ENOMEM;
			goto err_out_region;
		}
	} else {
		bp->base.port = bar_start;
		dev->base_addr = bar_start;
	}

	/* Initialize new device structure */
	dev->netdev_ops			= &dfx_netdev_ops;

	if (dfx_bus_pci)
		pci_set_master(to_pci_dev(bdev));

	if (dfx_driver_init(dev, print_name, bar_start) != DFX_K_SUCCESS) {
		err = -ENODEV;
		goto err_out_unmap;
	}

	err = register_netdev(dev);
	if (err)
		goto err_out_kfree;

	printk("%s: registered as %s\n", print_name, dev->name);
	return 0;

err_out_kfree:
	alloc_size = sizeof(PI_DESCR_BLOCK) +
		     PI_CMD_REQ_K_SIZE_MAX + PI_CMD_RSP_K_SIZE_MAX +
#ifndef DYNAMIC_BUFFERS
		     (bp->rcv_bufs_to_post * PI_RCV_DATA_K_SIZE_MAX) +
#endif
		     sizeof(PI_CONSUMER_BLOCK) +
		     (PI_ALIGN_K_DESC_BLK - 1);
	if (bp->kmalloced)
		dma_free_coherent(bdev, alloc_size,
				  bp->kmalloced, bp->kmalloced_dma);

err_out_unmap:
	if (dfx_use_mmio)
		iounmap(bp->base.mem);

err_out_region:
	if (dfx_use_mmio)
		release_mem_region(bar_start, bar_len);
	else
		release_region(bar_start, bar_len);

err_out_disable:
	if (dfx_bus_pci)
		pci_disable_device(to_pci_dev(bdev));

err_out:
	free_netdev(dev);
	return err;
}


/*
 * ================
 * = dfx_bus_init =
 * ================
 *
 * Overview:
 *   Initializes the bus-specific controller logic.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   Determine and save adapter IRQ in device table,
 *   then perform bus-specific logic initialization.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   bp->base has already been set with the proper
 *	 base I/O address for this device.
 *
 * Side Effects:
 *   Interrupts are enabled at the adapter bus-specific logic.
 *   Note:  Interrupts at the DMA engine (PDQ chip) are not
 *   enabled yet.
 */

static void dfx_bus_init(struct net_device *dev)
{
	DFX_board_t *bp = netdev_priv(dev);
	struct device *bdev = bp->bus_dev;
	int dfx_bus_pci = DFX_BUS_PCI(bdev);
	int dfx_bus_eisa = DFX_BUS_EISA(bdev);
	int dfx_bus_tc = DFX_BUS_TC(bdev);
	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;
	u8 val;

	DBG_printk("In dfx_bus_init...\n");

	/* Initialize a pointer back to the net_device struct */
	bp->dev = dev;

	/* Initialize adapter based on bus type */

	if (dfx_bus_tc)
		dev->irq = to_tc_dev(bdev)->interrupt;
	if (dfx_bus_eisa) {
		unsigned long base_addr = to_eisa_device(bdev)->base_addr;

		/* Get the interrupt level from the ESIC chip.  */
		val = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
		val &= PI_CONFIG_STAT_0_M_IRQ;
		val >>= PI_CONFIG_STAT_0_V_IRQ;

		switch (val) {
		case PI_CONFIG_STAT_0_IRQ_K_9:
			dev->irq = 9;
			break;

		case PI_CONFIG_STAT_0_IRQ_K_10:
			dev->irq = 10;
			break;

		case PI_CONFIG_STAT_0_IRQ_K_11:
			dev->irq = 11;
			break;

		case PI_CONFIG_STAT_0_IRQ_K_15:
			dev->irq = 15;
			break;
		}

		/*
		 * Enable memory decoding (MEMCS0) and/or port decoding
		 * (IOCS1/IOCS0) as appropriate in Function Control
		 * Register.  One of the port chip selects seems to be
		 * used for the Burst Holdoff register, but this bit of
		 * documentation is missing and as yet it has not been
		 * determined which of the two.  This is also the reason
		 * the size of the decoded port range is twice as large
		 * as one required by the PDQ.
		 */

		/* Set the decode range of the board.  */
		val = ((bp->base.port >> 12) << PI_IO_CMP_V_SLOT);
		outb(base_addr + PI_ESIC_K_IO_ADD_CMP_0_1, val);
		outb(base_addr + PI_ESIC_K_IO_ADD_CMP_0_0, 0);
		outb(base_addr + PI_ESIC_K_IO_ADD_CMP_1_1, val);
		outb(base_addr + PI_ESIC_K_IO_ADD_CMP_1_0, 0);
		val = PI_ESIC_K_CSR_IO_LEN - 1;
		outb(base_addr + PI_ESIC_K_IO_ADD_MASK_0_1, (val >> 8) & 0xff);
		outb(base_addr + PI_ESIC_K_IO_ADD_MASK_0_0, val & 0xff);
		outb(base_addr + PI_ESIC_K_IO_ADD_MASK_1_1, (val >> 8) & 0xff);
		outb(base_addr + PI_ESIC_K_IO_ADD_MASK_1_0, val & 0xff);

		/* Enable the decoders.  */
		val = PI_FUNCTION_CNTRL_M_IOCS1 | PI_FUNCTION_CNTRL_M_IOCS0;
		if (dfx_use_mmio)
			val |= PI_FUNCTION_CNTRL_M_MEMCS0;
		outb(base_addr + PI_ESIC_K_FUNCTION_CNTRL, val);

		/*
		 * Enable access to the rest of the module
		 * (including PDQ and packet memory).
		 */
		val = PI_SLOT_CNTRL_M_ENB;
		outb(base_addr + PI_ESIC_K_SLOT_CNTRL, val);

		/*
		 * Map PDQ registers into memory or port space.  This is
		 * done with a bit in the Burst Holdoff register.
		 */
		val = inb(base_addr + PI_DEFEA_K_BURST_HOLDOFF);
		if (dfx_use_mmio)
			val |= PI_BURST_HOLDOFF_V_MEM_MAP;
		else
			val &= ~PI_BURST_HOLDOFF_V_MEM_MAP;
		outb(base_addr + PI_DEFEA_K_BURST_HOLDOFF, val);

		/* Enable interrupts at EISA bus interface chip (ESIC) */
		val = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
		val |= PI_CONFIG_STAT_0_M_INT_ENB;
		outb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0, val);
	}
	if (dfx_bus_pci) {
		struct pci_dev *pdev = to_pci_dev(bdev);

		/* Get the interrupt level from the PCI Configuration Table */

		dev->irq = pdev->irq;

		/* Check Latency Timer and set if less than minimal */

		pci_read_config_byte(pdev, PCI_LATENCY_TIMER, &val);
		if (val < PFI_K_LAT_TIMER_MIN) {
			val = PFI_K_LAT_TIMER_DEF;
			pci_write_config_byte(pdev, PCI_LATENCY_TIMER, val);
		}

		/* Enable interrupts at PCI bus interface chip (PFI) */
		val = PFI_MODE_M_PDQ_INT_ENB | PFI_MODE_M_DMA_ENB;
		dfx_port_write_long(bp, PFI_K_REG_MODE_CTRL, val);
	}
}

/*
 * ==================
 * = dfx_bus_uninit =
 * ==================
 *
 * Overview:
 *   Uninitializes the bus-specific controller logic.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   Perform bus-specific logic uninitialization.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   bp->base has already been set with the proper
 *	 base I/O address for this device.
 *
 * Side Effects:
 *   Interrupts are disabled at the adapter bus-specific logic.
 */

static void dfx_bus_uninit(struct net_device *dev)
{
	DFX_board_t *bp = netdev_priv(dev);
	struct device *bdev = bp->bus_dev;
	int dfx_bus_pci = DFX_BUS_PCI(bdev);
	int dfx_bus_eisa = DFX_BUS_EISA(bdev);
	u8 val;

	DBG_printk("In dfx_bus_uninit...\n");

	/* Uninitialize adapter based on bus type */

	if (dfx_bus_eisa) {
		unsigned long base_addr = to_eisa_device(bdev)->base_addr;

		/* Disable interrupts at EISA bus interface chip (ESIC) */
		val = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
		val &= ~PI_CONFIG_STAT_0_M_INT_ENB;
		outb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0, val);
	}
	if (dfx_bus_pci) {
		/* Disable interrupts at PCI bus interface chip (PFI) */
		dfx_port_write_long(bp, PFI_K_REG_MODE_CTRL, 0);
	}
}


/*
 * ========================
 * = dfx_bus_config_check =
 * ========================
 *
 * Overview:
 *   Checks the configuration (burst size, full-duplex, etc.)  If any parameters
 *   are illegal, then this routine will set new defaults.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   For Revision 1 FDDI EISA, Revision 2 or later FDDI EISA with rev E or later
 *   PDQ, and all FDDI PCI controllers, all values are legal.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   dfx_adap_init has NOT been called yet so burst size and other items have
 *   not been set.
 *
 * Side Effects:
 *   None
 */

static void dfx_bus_config_check(DFX_board_t *bp)
{
	struct device __maybe_unused *bdev = bp->bus_dev;
	int dfx_bus_eisa = DFX_BUS_EISA(bdev);
	int	status;				/* return code from adapter port control call */
	u32	host_data;			/* LW data returned from port control call */

	DBG_printk("In dfx_bus_config_check...\n");

	/* Configuration check only valid for EISA adapter */

	if (dfx_bus_eisa) {
		/*
		 * First check if revision 2 EISA controller.  Rev. 1 cards used
		 * PDQ revision B, so no workaround needed in this case.  Rev. 3
		 * cards used PDQ revision E, so no workaround needed in this
		 * case, either.  Only Rev. 2 cards used either Rev. D or E
		 * chips, so we must verify the chip revision on Rev. 2 cards.
		 */
		if (to_eisa_device(bdev)->id.driver_data == DEFEA_PROD_ID_2) {
			/*
			 * Revision 2 FDDI EISA controller found,
			 * so let's check PDQ revision of adapter.
			 */
			status = dfx_hw_port_ctrl_req(bp,
											PI_PCTRL_M_SUB_CMD,
											PI_SUB_CMD_K_PDQ_REV_GET,
											0,
											&host_data);
			if ((status != DFX_K_SUCCESS) || (host_data == 2))
				{
				/*
				 * Either we couldn't determine the PDQ revision, or
				 * we determined that it is at revision D.  In either case,
				 * we need to implement the workaround.
				 */

				/* Ensure that the burst size is set to 8 longwords or less */

				switch (bp->burst_size)
					{
					case PI_PDATA_B_DMA_BURST_SIZE_32:
					case PI_PDATA_B_DMA_BURST_SIZE_16:
						bp->burst_size = PI_PDATA_B_DMA_BURST_SIZE_8;
						break;

					default:
						break;
					}

				/* Ensure that full-duplex mode is not enabled */

				bp->full_duplex_enb = PI_SNMP_K_FALSE;
				}
			}
		}
	}


/*
 * ===================
 * = dfx_driver_init =
 * ===================
 *
 * Overview:
 *   Initializes remaining adapter board structure information
 *   and makes sure adapter is in a safe state prior to dfx_open().
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   dev - pointer to device information
 *   print_name - printable device name
 *
 * Functional Description:
 *   This function allocates additional resources such as the host memory
 *   blocks needed by the adapter (eg. descriptor and consumer blocks).
 *	 Remaining bus initialization steps are also completed.  The adapter
 *   is also reset so that it is in the DMA_UNAVAILABLE state.  The OS
 *   must call dfx_open() to open the adapter and bring it on-line.
 *
 * Return Codes:
 *   DFX_K_SUCCESS	- initialization succeeded
 *   DFX_K_FAILURE	- initialization failed - could not allocate memory
 *						or read adapter MAC address
 *
 * Assumptions:
 *   Memory allocated from pci_alloc_consistent() call is physically
 *   contiguous, locked memory.
 *
 * Side Effects:
 *   Adapter is reset and should be in DMA_UNAVAILABLE state before
 *   returning from this routine.
 */

static int dfx_driver_init(struct net_device *dev, const char *print_name,
			   resource_size_t bar_start)
{
	DFX_board_t *bp = netdev_priv(dev);
	struct device *bdev = bp->bus_dev;
	int dfx_bus_pci = DFX_BUS_PCI(bdev);
	int dfx_bus_eisa = DFX_BUS_EISA(bdev);
	int dfx_bus_tc = DFX_BUS_TC(bdev);
	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;
	int alloc_size;			/* total buffer size needed */
	char *top_v, *curr_v;		/* virtual addrs into memory block */
	dma_addr_t top_p, curr_p;	/* physical addrs into memory block */
	u32 data;			/* host data register value */
	__le32 le32;
	char *board_name = NULL;

	DBG_printk("In dfx_driver_init...\n");

	/* Initialize bus-specific hardware registers */

	dfx_bus_init(dev);

	/*
	 * Initialize default values for configurable parameters
	 *
	 * Note: All of these parameters are ones that a user may
	 *       want to customize.  It'd be nice to break these
	 *		 out into Space.c or someplace else that's more
	 *		 accessible/understandable than this file.
	 */

	bp->full_duplex_enb		= PI_SNMP_K_FALSE;
	bp->req_ttrt			= 8 * 12500;		/* 8ms in 80 nanosec units */
	bp->burst_size			= PI_PDATA_B_DMA_BURST_SIZE_DEF;
	bp->rcv_bufs_to_post	= RCV_BUFS_DEF;

	/*
	 * Ensure that HW configuration is OK
	 *
	 * Note: Depending on the hardware revision, we may need to modify
	 *       some of the configurable parameters to workaround hardware
	 *       limitations.  We'll perform this configuration check AFTER
	 *       setting the parameters to their default values.
	 */

	dfx_bus_config_check(bp);

	/* Disable PDQ interrupts first */

	dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);

	/* Place adapter in DMA_UNAVAILABLE state by resetting adapter */

	(void) dfx_hw_dma_uninit(bp, PI_PDATA_A_RESET_M_SKIP_ST);

	/*  Read the factory MAC address from the adapter then save it */

	if (dfx_hw_port_ctrl_req(bp, PI_PCTRL_M_MLA, PI_PDATA_A_MLA_K_LO, 0,
				 &data) != DFX_K_SUCCESS) {
		printk("%s: Could not read adapter factory MAC address!\n",
		       print_name);
		return DFX_K_FAILURE;
	}
	le32 = cpu_to_le32(data);
	memcpy(&bp->factory_mac_addr[0], &le32, sizeof(u32));

	if (dfx_hw_port_ctrl_req(bp, PI_PCTRL_M_MLA, PI_PDATA_A_MLA_K_HI, 0,
				 &data) != DFX_K_SUCCESS) {
		printk("%s: Could not read adapter factory MAC address!\n",
		       print_name);
		return DFX_K_FAILURE;
	}
	le32 = cpu_to_le32(data);
	memcpy(&bp->factory_mac_addr[4], &le32, sizeof(u16));

	/*
	 * Set current address to factory address
	 *
	 * Note: Node address override support is handled through
	 *       dfx_ctl_set_mac_address.
	 */

	memcpy(dev->dev_addr, bp->factory_mac_addr, FDDI_K_ALEN);
	if (dfx_bus_tc)
		board_name = "DEFTA";
	if (dfx_bus_eisa)
		board_name = "DEFEA";
	if (dfx_bus_pci)
		board_name = "DEFPA";
	pr_info("%s: %s at %saddr = 0x%llx, IRQ = %d, Hardware addr = %pMF\n",
		print_name, board_name, dfx_use_mmio ? "" : "I/O ",
		(long long)bar_start, dev->irq, dev->dev_addr);

	/*
	 * Get memory for descriptor block, consumer block, and other buffers
	 * that need to be DMA read or written to by the adapter.
	 */

	alloc_size = sizeof(PI_DESCR_BLOCK) +
					PI_CMD_REQ_K_SIZE_MAX +
					PI_CMD_RSP_K_SIZE_MAX +
#ifndef DYNAMIC_BUFFERS
					(bp->rcv_bufs_to_post * PI_RCV_DATA_K_SIZE_MAX) +
#endif
					sizeof(PI_CONSUMER_BLOCK) +
					(PI_ALIGN_K_DESC_BLK - 1);
	bp->kmalloced = top_v = dma_zalloc_coherent(bp->bus_dev, alloc_size,
						    &bp->kmalloced_dma,
						    GFP_ATOMIC);
	if (top_v == NULL)
		return DFX_K_FAILURE;

	top_p = bp->kmalloced_dma;	/* get physical address of buffer */

	/*
	 *  To guarantee the 8K alignment required for the descriptor block, 8K - 1
	 *  plus the amount of memory needed was allocated.  The physical address
	 *	is now 8K aligned.  By carving up the memory in a specific order,
	 *  we'll guarantee the alignment requirements for all other structures.
	 *
	 *  Note: If the assumptions change regarding the non-paged, non-cached,
	 *		  physically contiguous nature of the memory block or the address
	 *		  alignments, then we'll need to implement a different algorithm
	 *		  for allocating the needed memory.
	 */

	curr_p = ALIGN(top_p, PI_ALIGN_K_DESC_BLK);
	curr_v = top_v + (curr_p - top_p);

	/* Reserve space for descriptor block */

	bp->descr_block_virt = (PI_DESCR_BLOCK *) curr_v;
	bp->descr_block_phys = curr_p;
	curr_v += sizeof(PI_DESCR_BLOCK);
	curr_p += sizeof(PI_DESCR_BLOCK);

	/* Reserve space for command request buffer */

	bp->cmd_req_virt = (PI_DMA_CMD_REQ *) curr_v;
	bp->cmd_req_phys = curr_p;
	curr_v += PI_CMD_REQ_K_SIZE_MAX;
	curr_p += PI_CMD_REQ_K_SIZE_MAX;

	/* Reserve space for command response buffer */

	bp->cmd_rsp_virt = (PI_DMA_CMD_RSP *) curr_v;
	bp->cmd_rsp_phys = curr_p;
	curr_v += PI_CMD_RSP_K_SIZE_MAX;
	curr_p += PI_CMD_RSP_K_SIZE_MAX;

	/* Reserve space for the LLC host receive queue buffers */

	bp->rcv_block_virt = curr_v;
	bp->rcv_block_phys = curr_p;

#ifndef DYNAMIC_BUFFERS
	curr_v += (bp->rcv_bufs_to_post * PI_RCV_DATA_K_SIZE_MAX);
	curr_p += (bp->rcv_bufs_to_post * PI_RCV_DATA_K_SIZE_MAX);
#endif

	/* Reserve space for the consumer block */

	bp->cons_block_virt = (PI_CONSUMER_BLOCK *) curr_v;
	bp->cons_block_phys = curr_p;

	/* Display virtual and physical addresses if debug driver */

	DBG_printk("%s: Descriptor block virt = %0lX, phys = %0X\n",
		   print_name,
		   (long)bp->descr_block_virt, bp->descr_block_phys);
	DBG_printk("%s: Command Request buffer virt = %0lX, phys = %0X\n",
		   print_name, (long)bp->cmd_req_virt, bp->cmd_req_phys);
	DBG_printk("%s: Command Response buffer virt = %0lX, phys = %0X\n",
		   print_name, (long)bp->cmd_rsp_virt, bp->cmd_rsp_phys);
	DBG_printk("%s: Receive buffer block virt = %0lX, phys = %0X\n",
		   print_name, (long)bp->rcv_block_virt, bp->rcv_block_phys);
	DBG_printk("%s: Consumer block virt = %0lX, phys = %0X\n",
		   print_name, (long)bp->cons_block_virt, bp->cons_block_phys);

	return DFX_K_SUCCESS;
}


/*
 * =================
 * = dfx_adap_init =
 * =================
 *
 * Overview:
 *   Brings the adapter to the link avail/link unavailable state.
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   bp - pointer to board information
 *   get_buffers - non-zero if buffers to be allocated
 *
 * Functional Description:
 *   Issues the low-level firmware/hardware calls necessary to bring
 *   the adapter up, or to properly reset and restore adapter during
 *   run-time.
 *
 * Return Codes:
 *   DFX_K_SUCCESS - Adapter brought up successfully
 *   DFX_K_FAILURE - Adapter initialization failed
 *
 * Assumptions:
 *   bp->reset_type should be set to a valid reset type value before
 *   calling this routine.
 *
 * Side Effects:
 *   Adapter should be in LINK_AVAILABLE or LINK_UNAVAILABLE state
 *   upon a successful return of this routine.
 */

static int dfx_adap_init(DFX_board_t *bp, int get_buffers)
	{
	DBG_printk("In dfx_adap_init...\n");

	/* Disable PDQ interrupts first */

	dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);

	/* Place adapter in DMA_UNAVAILABLE state by resetting adapter */

	if (dfx_hw_dma_uninit(bp, bp->reset_type) != DFX_K_SUCCESS)
		{
		printk("%s: Could not uninitialize/reset adapter!\n", bp->dev->name);
		return DFX_K_FAILURE;
		}

	/*
	 * When the PDQ is reset, some false Type 0 interrupts may be pending,
	 * so we'll acknowledge all Type 0 interrupts now before continuing.
	 */

	dfx_port_write_long(bp, PI_PDQ_K_REG_TYPE_0_STATUS, PI_HOST_INT_K_ACK_ALL_TYPE_0);

	/*
	 * Clear Type 1 and Type 2 registers before going to DMA_AVAILABLE state
	 *
	 * Note: We only need to clear host copies of these registers.  The PDQ reset
	 *       takes care of the on-board register values.
	 */

	bp->cmd_req_reg.lword	= 0;
	bp->cmd_rsp_reg.lword	= 0;
	bp->rcv_xmt_reg.lword	= 0;

	/* Clear consumer block before going to DMA_AVAILABLE state */

	memset(bp->cons_block_virt, 0, sizeof(PI_CONSUMER_BLOCK));

	/* Initialize the DMA Burst Size */

	if (dfx_hw_port_ctrl_req(bp,
							PI_PCTRL_M_SUB_CMD,
							PI_SUB_CMD_K_BURST_SIZE_SET,
							bp->burst_size,
							NULL) != DFX_K_SUCCESS)
		{
		printk("%s: Could not set adapter burst size!\n", bp->dev->name);
		return DFX_K_FAILURE;
		}

	/*
	 * Set base address of Consumer Block
	 *
	 * Assumption: 32-bit physical address of consumer block is 64 byte
	 *			   aligned.  That is, bits 0-5 of the address must be zero.
	 */

	if (dfx_hw_port_ctrl_req(bp,
							PI_PCTRL_M_CONS_BLOCK,
							bp->cons_block_phys,
							0,
							NULL) != DFX_K_SUCCESS)
		{
		printk("%s: Could not set consumer block address!\n", bp->dev->name);
		return DFX_K_FAILURE;
		}

	/*
	 * Set the base address of Descriptor Block and bring adapter
	 * to DMA_AVAILABLE state.
	 *
	 * Note: We also set the literal and data swapping requirements
	 *       in this command.
	 *
	 * Assumption: 32-bit physical address of descriptor block
	 *       is 8Kbyte aligned.
	 */
	if (dfx_hw_port_ctrl_req(bp, PI_PCTRL_M_INIT,
				 (u32)(bp->descr_block_phys |
				       PI_PDATA_A_INIT_M_BSWAP_INIT),
				 0, NULL) != DFX_K_SUCCESS) {
		printk("%s: Could not set descriptor block address!\n",
		       bp->dev->name);
		return DFX_K_FAILURE;
	}

	/* Set transmit flush timeout value */

	bp->cmd_req_virt->cmd_type = PI_CMD_K_CHARS_SET;
	bp->cmd_req_virt->char_set.item[0].item_code	= PI_ITEM_K_FLUSH_TIME;
	bp->cmd_req_virt->char_set.item[0].value		= 3;	/* 3 seconds */
	bp->cmd_req_virt->char_set.item[0].item_index	= 0;
	bp->cmd_req_virt->char_set.item[1].item_code	= PI_ITEM_K_EOL;
	if (dfx_hw_dma_cmd_req(bp) != DFX_K_SUCCESS)
		{
		printk("%s: DMA command request failed!\n", bp->dev->name);
		return DFX_K_FAILURE;
		}

	/* Set the initial values for eFDXEnable and MACTReq MIB objects */

	bp->cmd_req_virt->cmd_type = PI_CMD_K_SNMP_SET;
	bp->cmd_req_virt->snmp_set.item[0].item_code	= PI_ITEM_K_FDX_ENB_DIS;
	bp->cmd_req_virt->snmp_set.item[0].value		= bp->full_duplex_enb;
	bp->cmd_req_virt->snmp_set.item[0].item_index	= 0;
	bp->cmd_req_virt->snmp_set.item[1].item_code	= PI_ITEM_K_MAC_T_REQ;
	bp->cmd_req_virt->snmp_set.item[1].value		= bp->req_ttrt;
	bp->cmd_req_virt->snmp_set.item[1].item_index	= 0;
	bp->cmd_req_virt->snmp_set.item[2].item_code	= PI_ITEM_K_EOL;
	if (dfx_hw_dma_cmd_req(bp) != DFX_K_SUCCESS)
		{
		printk("%s: DMA command request failed!\n", bp->dev->name);
		return DFX_K_FAILURE;
		}

	/* Initialize adapter CAM */

	if (dfx_ctl_update_cam(bp) != DFX_K_SUCCESS)
		{
		printk("%s: Adapter CAM update failed!\n", bp->dev->name);
		return DFX_K_FAILURE;
		}

	/* Initialize adapter filters */

	if (dfx_ctl_update_filters(bp) != DFX_K_SUCCESS)
		{
		printk("%s: Adapter filters update failed!\n", bp->dev->name);
		return DFX_K_FAILURE;
		}

	/*
	 * Remove any existing dynamic buffers (i.e. if the adapter is being
	 * reinitialized)
	 */

	if (get_buffers)
		dfx_rcv_flush(bp);

	/* Initialize receive descriptor block and produce buffers */

	if (dfx_rcv_init(bp, get_buffers))
	        {
		printk("%s: Receive buffer allocation failed\n", bp->dev->name);
		if (get_buffers)
			dfx_rcv_flush(bp);
		return DFX_K_FAILURE;
		}

	/* Issue START command and bring adapter to LINK_(UN)AVAILABLE state */

	bp->cmd_req_virt->cmd_type = PI_CMD_K_START;
	if (dfx_hw_dma_cmd_req(bp) != DFX_K_SUCCESS)
		{
		printk("%s: Start command failed\n", bp->dev->name);
		if (get_buffers)
			dfx_rcv_flush(bp);
		return DFX_K_FAILURE;
		}

	/* Initialization succeeded, reenable PDQ interrupts */

	dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_ENABLE_DEF_INTS);
	return DFX_K_SUCCESS;
	}


/*
 * ============
 * = dfx_open =
 * ============
 *
 * Overview:
 *   Opens the adapter
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   This function brings the adapter to an operational state.
 *
 * Return Codes:
 *   0		 - Adapter was successfully opened
 *   -EAGAIN - Could not register IRQ or adapter initialization failed
 *
 * Assumptions:
 *   This routine should only be called for a device that was
 *   initialized successfully.
 *
 * Side Effects:
 *   Adapter should be in LINK_AVAILABLE or LINK_UNAVAILABLE state
 *   if the open is successful.
 */

static int dfx_open(struct net_device *dev)
{
	DFX_board_t *bp = netdev_priv(dev);
	int ret;

	DBG_printk("In dfx_open...\n");

	/* Register IRQ - support shared interrupts by passing device ptr */

	ret = request_irq(dev->irq, dfx_interrupt, IRQF_SHARED, dev->name,
			  dev);
	if (ret) {
		printk(KERN_ERR "%s: Requested IRQ %d is busy\n", dev->name, dev->irq);
		return ret;
	}

	/*
	 * Set current address to factory MAC address
	 *
	 * Note: We've already done this step in dfx_driver_init.
	 *       However, it's possible that a user has set a node
	 *		 address override, then closed and reopened the
	 *		 adapter.  Unless we reset the device address field
	 *		 now, we'll continue to use the existing modified
	 *		 address.
	 */

	memcpy(dev->dev_addr, bp->factory_mac_addr, FDDI_K_ALEN);

	/* Clear local unicast/multicast address tables and counts */

	memset(bp->uc_table, 0, sizeof(bp->uc_table));
	memset(bp->mc_table, 0, sizeof(bp->mc_table));
	bp->uc_count = 0;
	bp->mc_count = 0;

	/* Disable promiscuous filter settings */

	bp->ind_group_prom	= PI_FSTATE_K_BLOCK;
	bp->group_prom		= PI_FSTATE_K_BLOCK;

	spin_lock_init(&bp->lock);

	/* Reset and initialize adapter */

	bp->reset_type = PI_PDATA_A_RESET_M_SKIP_ST;	/* skip self-test */
	if (dfx_adap_init(bp, 1) != DFX_K_SUCCESS)
	{
		printk(KERN_ERR "%s: Adapter open failed!\n", dev->name);
		free_irq(dev->irq, dev);
		return -EAGAIN;
	}

	/* Set device structure info */
	netif_start_queue(dev);
	return 0;
}


/*
 * =============
 * = dfx_close =
 * =============
 *
 * Overview:
 *   Closes the device/module.
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   This routine closes the adapter and brings it to a safe state.
 *   The interrupt service routine is deregistered with the OS.
 *   The adapter can be opened again with another call to dfx_open().
 *
 * Return Codes:
 *   Always return 0.
 *
 * Assumptions:
 *   No further requests for this adapter are made after this routine is
 *   called.  dfx_open() can be called to reset and reinitialize the
 *   adapter.
 *
 * Side Effects:
 *   Adapter should be in DMA_UNAVAILABLE state upon completion of this
 *   routine.
 */

static int dfx_close(struct net_device *dev)
{
	DFX_board_t *bp = netdev_priv(dev);

	DBG_printk("In dfx_close...\n");

	/* Disable PDQ interrupts first */

	dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);

	/* Place adapter in DMA_UNAVAILABLE state by resetting adapter */

	(void) dfx_hw_dma_uninit(bp, PI_PDATA_A_RESET_M_SKIP_ST);

	/*
	 * Flush any pending transmit buffers
	 *
	 * Note: It's important that we flush the transmit buffers
	 *		 BEFORE we clear our copy of the Type 2 register.
	 *		 Otherwise, we'll have no idea how many buffers
	 *		 we need to free.
	 */

	dfx_xmt_flush(bp);

	/*
	 * Clear Type 1 and Type 2 registers after adapter reset
	 *
	 * Note: Even though we're closing the adapter, it's
	 *       possible that an interrupt will occur after
	 *		 dfx_close is called.  Without some assurance to
	 *		 the contrary we want to make sure that we don't
	 *		 process receive and transmit LLC frames and update
	 *		 the Type 2 register with bad information.
	 */

	bp->cmd_req_reg.lword	= 0;
	bp->cmd_rsp_reg.lword	= 0;
	bp->rcv_xmt_reg.lword	= 0;

	/* Clear consumer block for the same reason given above */

	memset(bp->cons_block_virt, 0, sizeof(PI_CONSUMER_BLOCK));

	/* Release all dynamically allocate skb in the receive ring. */

	dfx_rcv_flush(bp);

	/* Clear device structure flags */

	netif_stop_queue(dev);

	/* Deregister (free) IRQ */

	free_irq(dev->irq, dev);

	return 0;
}


/*
 * ======================
 * = dfx_int_pr_halt_id =
 * ======================
 *
 * Overview:
 *   Displays halt id's in string form.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Determine current halt id and display appropriate string.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   None
 */

static void dfx_int_pr_halt_id(DFX_board_t	*bp)
	{
	PI_UINT32	port_status;			/* PDQ port status register value */
	PI_UINT32	halt_id;				/* PDQ port status halt ID */

	/* Read the latest port status */

	dfx_port_read_long(bp, PI_PDQ_K_REG_PORT_STATUS, &port_status);

	/* Display halt state transition information */

	halt_id = (port_status & PI_PSTATUS_M_HALT_ID) >> PI_PSTATUS_V_HALT_ID;
	switch (halt_id)
		{
		case PI_HALT_ID_K_SELFTEST_TIMEOUT:
			printk("%s: Halt ID: Selftest Timeout\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_PARITY_ERROR:
			printk("%s: Halt ID: Host Bus Parity Error\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_HOST_DIR_HALT:
			printk("%s: Halt ID: Host-Directed Halt\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_SW_FAULT:
			printk("%s: Halt ID: Adapter Software Fault\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_HW_FAULT:
			printk("%s: Halt ID: Adapter Hardware Fault\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_PC_TRACE:
			printk("%s: Halt ID: FDDI Network PC Trace Path Test\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_DMA_ERROR:
			printk("%s: Halt ID: Adapter DMA Error\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_IMAGE_CRC_ERROR:
			printk("%s: Halt ID: Firmware Image CRC Error\n", bp->dev->name);
			break;

		case PI_HALT_ID_K_BUS_EXCEPTION:
			printk("%s: Halt ID: 68000 Bus Exception\n", bp->dev->name);
			break;

		default:
			printk("%s: Halt ID: Unknown (code = %X)\n", bp->dev->name, halt_id);
			break;
		}
	}


/*
 * ==========================
 * = dfx_int_type_0_process =
 * ==========================
 *
 * Overview:
 *   Processes Type 0 interrupts.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Processes all enabled Type 0 interrupts.  If the reason for the interrupt
 *   is a serious fault on the adapter, then an error message is displayed
 *   and the adapter is reset.
 *
 *   One tricky potential timing window is the rapid succession of "link avail"
 *   "link unavail" state change interrupts.  The acknowledgement of the Type 0
 *   interrupt must be done before reading the state from the Port Status
 *   register.  This is true because a state change could occur after reading
 *   the data, but before acknowledging the interrupt.  If this state change
 *   does happen, it would be lost because the driver is using the old state,
 *   and it will never know about the new state because it subsequently
 *   acknowledges the state change interrupt.
 *
 *          INCORRECT                                      CORRECT
 *      read type 0 int reasons                   read type 0 int reasons
 *      read adapter state                        ack type 0 interrupts
 *      ack type 0 interrupts                     read adapter state
 *      ... process interrupt ...                 ... process interrupt ...
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   An adapter reset may occur if the adapter has any Type 0 error interrupts
 *   or if the port status indicates that the adapter is halted.  The driver
 *   is responsible for reinitializing the adapter with the current CAM
 *   contents and adapter filter settings.
 */

static void dfx_int_type_0_process(DFX_board_t	*bp)

	{
	PI_UINT32	type_0_status;		/* Host Interrupt Type 0 register */
	PI_UINT32	state;				/* current adap state (from port status) */

	/*
	 * Read host interrupt Type 0 register to determine which Type 0
	 * interrupts are pending.  Immediately write it back out to clear
	 * those interrupts.
	 */

	dfx_port_read_long(bp, PI_PDQ_K_REG_TYPE_0_STATUS, &type_0_status);
	dfx_port_write_long(bp, PI_PDQ_K_REG_TYPE_0_STATUS, type_0_status);

	/* Check for Type 0 error interrupts */

	if (type_0_status & (PI_TYPE_0_STAT_M_NXM |
							PI_TYPE_0_STAT_M_PM_PAR_ERR |
							PI_TYPE_0_STAT_M_BUS_PAR_ERR))
		{
		/* Check for Non-Existent Memory error */

		if (type_0_status & PI_TYPE_0_STAT_M_NXM)
			printk("%s: Non-Existent Memory Access Error\n", bp->dev->name);

		/* Check for Packet Memory Parity error */

		if (type_0_status & PI_TYPE_0_STAT_M_PM_PAR_ERR)
			printk("%s: Packet Memory Parity Error\n", bp->dev->name);

		/* Check for Host Bus Parity error */

		if (type_0_status & PI_TYPE_0_STAT_M_BUS_PAR_ERR)
			printk("%s: Host Bus Parity Error\n", bp->dev->name);

		/* Reset adapter and bring it back on-line */

		bp->link_available = PI_K_FALSE;	/* link is no longer available */
		bp->reset_type = 0;					/* rerun on-board diagnostics */
		printk("%s: Resetting adapter...\n", bp->dev->name);
		if (dfx_adap_init(bp, 0) != DFX_K_SUCCESS)
			{
			printk("%s: Adapter reset failed!  Disabling adapter interrupts.\n", bp->dev->name);
			dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);
			return;
			}
		printk("%s: Adapter reset successful!\n", bp->dev->name);
		return;
		}

	/* Check for transmit flush interrupt */

	if (type_0_status & PI_TYPE_0_STAT_M_XMT_FLUSH)
		{
		/* Flush any pending xmt's and acknowledge the flush interrupt */

		bp->link_available = PI_K_FALSE;		/* link is no longer available */
		dfx_xmt_flush(bp);						/* flush any outstanding packets */
		(void) dfx_hw_port_ctrl_req(bp,
									PI_PCTRL_M_XMT_DATA_FLUSH_DONE,
									0,
									0,
									NULL);
		}

	/* Check for adapter state change */

	if (type_0_status & PI_TYPE_0_STAT_M_STATE_CHANGE)
		{
		/* Get latest adapter state */

		state = dfx_hw_adap_state_rd(bp);	/* get adapter state */
		if (state == PI_STATE_K_HALTED)
			{
			/*
			 * Adapter has transitioned to HALTED state, try to reset
			 * adapter to bring it back on-line.  If reset fails,
			 * leave the adapter in the broken state.
			 */

			printk("%s: Controller has transitioned to HALTED state!\n", bp->dev->name);
			dfx_int_pr_halt_id(bp);			/* display halt id as string */

			/* Reset adapter and bring it back on-line */

			bp->link_available = PI_K_FALSE;	/* link is no longer available */
			bp->reset_type = 0;					/* rerun on-board diagnostics */
			printk("%s: Resetting adapter...\n", bp->dev->name);
			if (dfx_adap_init(bp, 0) != DFX_K_SUCCESS)
				{
				printk("%s: Adapter reset failed!  Disabling adapter interrupts.\n", bp->dev->name);
				dfx_port_write_long(bp, PI_PDQ_K_REG_HOST_INT_ENB, PI_HOST_INT_K_DISABLE_ALL_INTS);
				return;
				}
			printk("%s: Adapter reset successful!\n", bp->dev->name);
			}
		else if (state == PI_STATE_K_LINK_AVAIL)
			{
			bp->link_available = PI_K_TRUE;		/* set link available flag */
			}
		}
	}


/*
 * ==================
 * = dfx_int_common =
 * ==================
 *
 * Overview:
 *   Interrupt service routine (ISR)
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   This is the ISR which processes incoming adapter interrupts.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   This routine assumes PDQ interrupts have not been disabled.
 *   When interrupts are disabled at the PDQ, the Port Status register
 *   is automatically cleared.  This routine uses the Port Status
 *   register value to determine whether a Type 0 interrupt occurred,
 *   so it's important that adapter interrupts are not normally
 *   enabled/disabled at the PDQ.
 *
 *   It's vital that this routine is NOT reentered for the
 *   same board and that the OS is not in another section of
 *   code (eg. dfx_xmt_queue_pkt) for the same board on a
 *   different thread.
 *
 * Side Effects:
 *   Pending interrupts are serviced.  Depending on the type of
 *   interrupt, acknowledging and clearing the interrupt at the
 *   PDQ involves writing a register to clear the interrupt bit
 *   or updating completion indices.
 */

static void dfx_int_common(struct net_device *dev)
{
	DFX_board_t *bp = netdev_priv(dev);
	PI_UINT32	port_status;		/* Port Status register */

	/* Process xmt interrupts - frequent case, so always call this routine */

	if(dfx_xmt_done(bp))				/* free consumed xmt packets */
		netif_wake_queue(dev);

	/* Process rcv interrupts - frequent case, so always call this routine */

	dfx_rcv_queue_process(bp);		/* service received LLC frames */

	/*
	 * Transmit and receive producer and completion indices are updated on the
	 * adapter by writing to the Type 2 Producer register.  Since the frequent
	 * case is that we'll be processing either LLC transmit or receive buffers,
	 * we'll optimize I/O writes by doing a single register write here.
	 */

	dfx_port_write_long(bp, PI_PDQ_K_REG_TYPE_2_PROD, bp->rcv_xmt_reg.lword);

	/* Read PDQ Port Status register to find out which interrupts need processing */

	dfx_port_read_long(bp, PI_PDQ_K_REG_PORT_STATUS, &port_status);

	/* Process Type 0 interrupts (if any) - infrequent, so only call when needed */

	if (port_status & PI_PSTATUS_M_TYPE_0_PENDING)
		dfx_int_type_0_process(bp);	/* process Type 0 interrupts */
	}


/*
 * =================
 * = dfx_interrupt =
 * =================
 *
 * Overview:
 *   Interrupt processing routine
 *
 * Returns:
 *   Whether a valid interrupt was seen.
 *
 * Arguments:
 *   irq	- interrupt vector
 *   dev_id	- pointer to device information
 *
 * Functional Description:
 *   This routine calls the interrupt processing routine for this adapter.  It
 *   disables and reenables adapter interrupts, as appropriate.  We can support
 *   shared interrupts since the incoming dev_id pointer provides our device
 *   structure context.
 *
 * Return Codes:
 *   IRQ_HANDLED - an IRQ was handled.
 *   IRQ_NONE    - no IRQ was handled.
 *
 * Assumptions:
 *   The interrupt acknowledgement at the hardware level (eg. ACKing the PIC
 *   on Intel-based systems) is done by the operating system outside this
 *   routine.
 *
 *	 System interrupts are enabled through this call.
 *
 * Side Effects:
 *   Interrupts are disabled, then reenabled at the adapter.
 */

static irqreturn_t dfx_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	DFX_board_t *bp = netdev_priv(dev);
	struct device *bdev = bp->bus_dev;
	int dfx_bus_pci = DFX_BUS_PCI(bdev);
	int dfx_bus_eisa = DFX_BUS_EISA(bdev);
	int dfx_bus_tc = DFX_BUS_TC(bdev);

	/* Service adapter interrupts */

	if (dfx_bus_pci) {
		u32 status;

		dfx_port_read_long(bp, PFI_K_REG_STATUS, &status);
		if (!(status & PFI_STATUS_M_PDQ_INT))
			return IRQ_NONE;

		spin_lock(&bp->lock);

		/* Disable PDQ-PFI interrupts at PFI */
		dfx_port_write_long(bp, PFI_K_REG_MODE_CTRL,
				    PFI_MODE_M_DMA_ENB);

		/* Call interrupt service routine for this adapter */
		dfx_int_common(dev);

		/* Clear PDQ interrupt status bit and reenable interrupts */
		dfx_port_write_long(bp, PFI_K_REG_STATUS,
				    PFI_STATUS_M_PDQ_INT);
		dfx_port_write_long(bp, PFI_K_REG_MODE_CTRL,
				    (PFI_MODE_M_PDQ_INT_ENB |
				     PFI_MODE_M_DMA_ENB));

		spin_unlock(&bp->lock);
	}
	if (dfx_bus_eisa) {
		unsigned long base_addr = to_eisa_device(bdev)->base_addr;
		u8 status;

		status = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
		if (!(status & PI_CONFIG_STAT_0_M_PEND))
			return IRQ_NONE;

		spin_lock(&bp->lock);

		/* Disable interrupts at the ESIC */
		status &= ~PI_CONFIG_STAT_0_M_INT_ENB;
		outb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0, status);

		/* Call interrupt service routine for this adapter */
		dfx_int_common(dev);

		/* Reenable interrupts at the ESIC */
		status = inb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0);
		status |= PI_CONFIG_STAT_0_M_INT_ENB;
		outb(base_addr + PI_ESIC_K_IO_CONFIG_STAT_0, status);

		spin_unlock(&bp->lock);
	}
	if (dfx_bus_tc) {
		u32 status;

		dfx_port_read_long(bp, PI_PDQ_K_REG_PORT_STATUS, &status);
		if (!(status & (PI_PSTATUS_M_RCV_DATA_PENDING |
				PI_PSTATUS_M_XMT_DATA_PENDING |
				PI_PSTATUS_M_SMT_HOST_PENDING |
				PI_PSTATUS_M_UNSOL_PENDING |
				PI_PSTATUS_M_CMD_RSP_PENDING |
				PI_PSTATUS_M_CMD_REQ_PENDING |
				PI_PSTATUS_M_TYPE_0_PENDING)))
			return IRQ_NONE;

		spin_lock(&bp->lock);

		/* Call interrupt service routine for this adapter */
		dfx_int_common(dev);

		spin_unlock(&bp->lock);
	}

	return IRQ_HANDLED;
}


/*
 * =====================
 * = dfx_ctl_get_stats =
 * =====================
 *
 * Overview:
 *   Get statistics for FDDI adapter
 *
 * Returns:
 *   Pointer to FDDI statistics structure
 *
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   Gets current MIB objects from adapter, then
 *   returns FDDI statistics structure as defined
 *   in if_fddi.h.
 *
 *   Note: Since the FDDI statistics structure is
 *   still new and the device structure doesn't
 *   have an FDDI-specific get statistics handler,
 *   we'll return the FDDI statistics structure as
 *   a pointer to an Ethernet statistics structure.
 *   That way, at least the first part of the statistics
 *   structure can be decoded properly, and it allows
 *   "smart" applications to perform a second cast to
 *   decode the FDDI-specific statistics.
 *
 *   We'll have to pay attention to this routine as the
 *   device structure becomes more mature and LAN media
 *   independent.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   None
 */

static struct net_device_stats *dfx_ctl_get_stats(struct net_device *dev)
	{
	DFX_board_t *bp = netdev_priv(dev);

	/* Fill the bp->stats structure with driver-maintained counters */

	bp->stats.gen.rx_packets = bp->rcv_total_frames;
	bp->stats.gen.tx_packets = bp->xmt_total_frames;
	bp->stats.gen.rx_bytes   = bp->rcv_total_bytes;
	bp->stats.gen.tx_bytes   = bp->xmt_total_bytes;
	bp->stats.gen.rx_errors  = bp->rcv_crc_errors +
				   bp->rcv_frame_status_errors +
				   bp->rcv_length_errors;
	bp->stats.gen.tx_errors  = bp->xmt_length_errors;
	bp->stats.gen.rx_dropped = bp->rcv_discards;
	bp->stats.gen.tx_dropped = bp->xmt_discards;
	bp->stats.gen.multicast  = bp->rcv_multicast_frames;
	bp->stats.gen.collisions = 0;		/* always zero (0) for FDDI */

	/* Get FDDI SMT MIB objects */

	bp->cmd_req_virt->cmd_type = PI_CMD_K_SMT_MIB_GET;
	if (dfx_hw_dma_cmd_req(bp) != DFX_K_SUCCESS)
		return (struct net_device_stats *)&bp->stats;

	/* Fill the bp->stats structure with the SMT MIB object values */

	memcpy(bp->stats.smt_station_id, &bp->cmd_rsp_virt->smt_mib_get.smt_station_id, sizeof(bp->cmd_rsp_virt->smt_mib_get.smt_station_id));
	bp->stats.smt_op_version_id					= bp->cmd_rsp_virt->smt_mib_get.smt_op_version_id;
	bp->stats.smt_hi_version_id					= bp->cmd_rsp_virt->smt_mib_get.smt_hi_version_id;
	bp->stats.smt_lo_version_id					= bp->cmd_rsp_virt->smt_mib_get.smt_lo_version_id;
	memcpy(bp->stats.smt_user_data, &bp->cmd_rsp_virt->smt_mib_get.smt_user_data, sizeof(bp->cmd_rsp_virt->smt_mib_get.smt_user_data));
	bp->stats.smt_mib_version_id				= bp->cmd_rsp_virt->smt_mib_get.smt_mib_version_id;
	bp->stats.smt_mac_cts						= bp->cmd_rsp_virt->smt_mib_get.smt_mac_ct;
	bp->stats.smt_non_master_cts				= bp->cmd_rsp_virt->smt_mib_get.smt_non_master_ct;
	bp->stats.smt_master_cts					= bp->cmd_rsp_virt->smt_mib_get.smt_master_ct;
	bp->stats.smt_available_paths				= bp->cmd_rsp_virt->smt_mib_get.smt_available_paths;
	bp->stats.smt_config_capabilities			= bp->cmd_rsp_virt->smt_mib_get.smt_config_capabilities;
	bp->stats.smt_config_policy					= bp->cmd_rsp_virt->smt_mib_get.smt_config_policy;
	bp->stats.smt_connection_policy				= bp->cmd_rsp_virt->smt_mib_get.smt_connection_policy;
	bp->stats.smt_t_notify						= bp->cmd_rsp_virt->smt_mib_get.smt_t_notify;
	bp->stats.smt_stat_rpt_policy				= bp->cmd_rsp_virt->smt_mib_get.smt_stat_rpt_policy;
	bp->stats.smt_trace_max_expiration			= bp->cmd_rsp_virt->smt_mib_get.smt_trace_max_expiration;
	bp->stats.smt_bypass_present				= bp->cmd_rsp_virt->smt_mib_get.smt_bypass_present;
	bp->stats.smt_ecm_state						= bp->cmd_rsp_virt->smt_mib_get.smt_ecm_state;
	bp->stats.smt_cf_state						= bp->cmd_rsp_virt->smt_mib_get.smt_cf_state;
	bp->stats.smt_remote_disconnect_flag		= bp->cmd_rsp_virt->smt_mib_get.smt_remote_disconnect_flag;
	bp->stats.smt_station_status				= bp->cmd_rsp_virt->smt_mib_get.smt_station_status;
	bp->stats.smt_peer_wrap_flag				= bp->cmd_rsp_virt->smt_mib_get.smt_peer_wrap_flag;
	bp->stats.smt_time_stamp					= bp->cmd_rsp_virt->smt_mib_get.smt_msg_time_stamp.ls;
	bp->stats.smt_transition_time_stamp			= bp->cmd_rsp_virt->smt_mib_get.smt_transition_time_stamp.ls;
	bp->stats.mac_frame_status_functions		= bp->cmd_rsp_virt->smt_mib_get.mac_frame_status_functions;
	bp->stats.mac_t_max_capability				= bp->cmd_rsp_virt->smt_mib_get.mac_t_max_capability;
	bp->stats.mac_tvx_capability				= bp->cmd_rsp_virt->smt_mib_get.mac_tvx_capability;
	bp->stats.mac_available_paths				= bp->cmd_rsp_virt->smt_mib_get.mac_available_paths;
	bp->stats.mac_current_path					= bp->cmd_rsp_virt->smt_mib_get.mac_current_path;
	memcpy(bp->stats.mac_upstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_upstream_nbr, FDDI_K_ALEN);
	memcpy(bp->stats.mac_downstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_downstream_nbr, FDDI_K_ALEN);
	memcpy(bp->stats.mac_old_upstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_old_upstream_nbr, FDDI_K_ALEN);
	memcpy(bp->stats.mac_old_downstream_nbr, &bp->cmd_rsp_virt->smt_mib_get.mac_old_downstream_nbr, FDDI_K_ALEN);
	bp->stats.mac_dup_address_test				= bp->cmd_rsp_virt->smt_mib_get.mac_dup_address_test;
	bp->stats.mac_requested_paths				= bp->cmd_rsp_virt->smt_mib_get.mac_requested_paths;
	bp->stats.mac_downstream_port_type			= bp->cmd_rsp_virt->smt_mib_get.mac_downstream_port_type;
	memcpy(bp->stats.mac_smt_address, &bp->cmd_rsp_virt->smt_mib_get.mac_smt_address, FDDI_K_ALEN);
	bp->stats.mac_t_req							= bp->cmd_rsp_virt->smt_mib_get.mac_t_req;
	bp->stats.mac_t_neg							= bp->cmd_rsp_virt->smt_mib_get.mac_t_neg;
	bp->stats.mac_t_max							= bp->cmd_rsp_virt->smt_mib_get.mac_t_max;
	bp->stats.mac_tvx_value						= bp->cmd_rsp_virt->smt_mib_get.mac_tvx_value;
	bp->stats.mac_frame_error_threshold			= bp->cmd_rsp_virt->smt_mib_get.mac_frame_error_threshold;
	bp->stats.mac_frame_error_ratio				= bp->cmd_rsp_virt->smt_mib_get.mac_frame_error_ratio;
	bp->stats.mac_rmt_state						= bp->cmd_rsp_virt->smt_mib_get.mac_rmt_state;
	bp->stats.mac_da_flag						= bp->cmd_rsp_virt->smt_mib_get.mac_da_flag;
	bp->stats.mac_una_da_flag					= bp->cmd_rsp_virt->smt_mib_get.mac_unda_flag;
	bp->stats.mac_frame_error_flag				= bp->cmd_rsp_virt->smt_mib_get.mac_frame_error_flag;
	bp->stats.mac_ma_unitdata_available			= bp->cmd_rsp_virt->smt_mib_get.mac_ma_unitdata_available;
	bp->stats.mac_hardware_present				= bp->cmd_rsp_virt->smt_mib_get.mac_hardware_present;
	bp->stats.mac_ma_unitdata_enable			= bp->cmd_rsp_virt->smt_mib_get.mac_ma_unitdata_enable;
	bp->stats.path_tvx_lower_bound				= bp->cmd_rsp_virt->smt_mib_get.path_tvx_lower_bound;
	bp->stats.path_t_max_lower_bound			= bp->cmd_rsp_virt->smt_mib_get.path_t_max_lower_bound;
	bp->stats.path_max_t_req					= bp->cmd_rsp_virt->smt_mib_get.path_max_t_req;
	memcpy(bp->stats.path_configuration, &bp->cmd_rsp_virt->smt_mib_get.path_configuration, sizeof(bp->cmd_rsp_virt->smt_mib_get.path_configuration));
	bp->stats.port_my_type[0]					= bp->cmd_rsp_virt->smt_mib_get.port_my_type[0];
	bp->stats.port_my_type[1]					= bp->cmd_rsp_virt->smt_mib_get.port_my_type[1];
	bp->stats.port_neighbor_type[0]				= bp->cmd_rsp_virt->smt_mib_get.port_neighbor_type[0];
	bp->stats.port_neighbor_type[1]				= bp->cmd_rsp_virt->smt_mib_get.port_neighbor_type[1];
	bp->stats.port_connection_policies[0]		= bp->cmd_rsp_virt->smt_mib_get.port_connection_policies[0];
	bp->stats.port_connection_policies[1]		= bp->cmd_rsp_virt->smt_mib_get.port_connection_policies[1];
	bp->stats.port_mac_indicated[0]				= bp->cmd_rsp_virt->smt_mib_get.port_mac_indicated[0];
	bp->stats.port_mac_indicated[1]				= bp->cmd_rsp_virt->smt_mib_get.port_mac_indicated[1];
	bp->stats.port_current_path[0]				= bp->cmd_rsp_virt->smt_mib_get.port_current_path[0];
	bp->stats.port_current_path[1]				= bp->cmd_rsp_virt->smt_mib_get.port_current_path[1];
	memcpy(&bp->stats.port_requested_paths[0*3], &bp->cmd_rsp_virt->smt_mib_get.port_requested_paths[0], 3);
	memcpy(&bp->stats.port_requested_paths[1*3], &bp->cmd_rsp_virt->smt_mib_get.port_requested_paths[1], 3);
	bp->stats.port_mac_placement[0]				= bp->cmd_rsp_virt->smt_mib_get.port_mac_placement[0];
	bp->stats.port_mac_placement[1]				= bp->cmd_rsp_virt->smt_mib_get.port_mac_placement[1];
	bp->stats.port_available_paths[0]			= bp->cmd_rsp_virt->smt_mib_get.port_available_paths[0];
	bp->stats.port_available_paths[1]			= bp->cmd_rsp_virt->smt_mib_get.port_available_paths[1];
	bp->stats.port_pmd_class[0]					= bp->cmd_rsp_virt->smt_mib_get.port_pmd_class[0];
	bp->stats.port_pmd_class[1]					= bp->cmd_rsp_virt->smt_mib_get.port_pmd_class[1];
	bp->stats.port_connection_capabilities[0]	= bp->cmd_rsp_virt->smt_mib_get.port_connection_capabilities[0];
	bp->stats.port_connection_capabilities[1]	= bp->cmd_rsp_virt->smt_mib_get.port_connection_capabilities[1];
	bp->stats.port_bs_flag[0]					= bp->cmd_rsp_virt->smt_mib_get.port_bs_flag[0];
	bp->stats.port_bs_flag[1]					= bp->cmd_rsp_virt->smt_mib_get.port_bs_flag[1];
	bp->stats.port_ler_estimate[0]				= bp->cmd_rsp_virt->smt_mib_get.port_ler_estimate[0];
	bp->stats.port_ler_estimate[1]				= bp->cmd_rsp_virt->smt_mib_get.port_ler_estimate[1];
	bp->stats.port_ler_cutoff[0]				= bp->cmd_rsp_virt->smt_mib_get.port_ler_cutoff[0];
	bp->stats.port_ler_cutoff[1]				= bp->cmd_rsp_virt->smt_mib_get.port_ler_cutoff[1];
	bp->stats.port_ler_alarm[0]					= bp->cmd_rsp_virt->smt_mib_get.port_ler_alarm[0];
	bp->stats.port_ler_alarm[1]					= bp->cmd_rsp_virt->smt_mib_get.port_ler_alarm[1];
	bp->stats.port_connect_state[0]				= bp->cmd_rsp_virt->smt_mib_get.port_connect_state[0];
	bp->stats.port_connect_state[1]				= bp->cmd_rsp_virt->smt_mib_get.port_connect_state[1];
	bp->stats.port_pcm_state[0]					= bp->cmd_rsp_virt->smt_mib_get.port_pcm_state[0];
	bp->stats.port_pcm_state[1]					= bp->cmd_rsp_virt->smt_mib_get.port_pcm_state[1];
	bp->stats.port_pc_withhold[0]				= bp->cmd_rsp_virt->smt_mib_get.port_pc_withhold[0];
	bp->stats.port_pc_withhold[1]				= bp->cmd_rsp_virt->smt_mib_get.port_pc_withhold[1];
	bp->stats.port_ler_flag[0]					= bp->cmd_rsp_virt->smt_mib_get.port_ler_flag[0];
	bp->stats.port_ler_flag[1]					= bp->cmd_rsp_virt->smt_mib_get.port_ler_flag[1];
	bp->stats.port_hardware_present[0]			= bp->cmd_rsp_virt->smt_mib_get.port_hardware_present[0];
	bp->stats.port_hardware_present[1]			= bp->cmd_rsp_virt->smt_mib_get.port_hardware_present[1];

	/* Get FDDI counters */

	bp->cmd_req_virt->cmd_type = PI_CMD_K_CNTRS_GET;
	if (dfx_hw_dma_cmd_req(bp) != DFX_K_SUCCESS)
		return (struct net_device_stats *)&bp->stats;

	/* Fill the bp->stats structure with the FDDI counter values */

	bp->stats.mac_frame_cts				= bp->cmd_rsp_virt->cntrs_get.cntrs.frame_cnt.ls;
	bp->stats.mac_copied_cts			= bp->cmd_rsp_virt->cntrs_get.cntrs.copied_cnt.ls;
	bp->stats.mac_transmit_cts			= bp->cmd_rsp_virt->cntrs_get.cntrs.transmit_cnt.ls;
	bp->stats.mac_error_cts				= bp->cmd_rsp_virt->cntrs_get.cntrs.error_cnt.ls;
	bp->stats.mac_lost_cts				= bp->cmd_rsp_virt->cntrs_get.cntrs.lost_cnt.ls;
	bp->stats.port_lct_fail_cts[0]		= bp->cmd_rsp_virt->cntrs_get.cntrs.lct_rejects[0].ls;
	bp->stats.port_lct_fail_cts[1]		= bp->cmd_rsp_virt->cntrs_get.cntrs.lct_rejects[1].ls;
	bp->stats.port_lem_reject_cts[0]	= bp->cmd_rsp_virt->cntrs_get.cntrs.lem_rejects[0].ls;
	bp->stats.port_lem_reject_cts[1]	= bp->cmd_rsp_virt->cntrs_get.cntrs.lem_rejects[1].ls;
	bp->stats.port_lem_cts[0]			= bp->cmd_rsp_virt->cntrs_get.cntrs.link_errors[0].ls;
	bp->stats.port_lem_cts[1]			= bp->cmd_rsp_virt->cntrs_get.cntrs.link_errors[1].ls;

	return (struct net_device_stats *)&bp->stats;
	}


/*
 * ==============================
 * = dfx_ctl_set_multicast_list =
 * ==============================
 *
 * Overview:
 *   Enable/Disable LLC frame promiscuous mode reception
 *   on the adapter and/or update multicast address table.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   dev - pointer to device information
 *
 * Functional Description:
 *   This routine follows a fairly simple algorithm for setting the
 *   adapter filters and CAM:
 *
 *		if IFF_PROMISC flag is set
 *			enable LLC individual/group promiscuous mode
 *		else
 *			disable LLC individual/group promiscuous mode
 *			if number of incoming multicast addresses >
 *					(CAM max size - number of unicast addresses in CAM)
 *				enable LLC group promiscuous mode
 *				set driver-maintained multicast address count to zero
 *			else
 *				disable LLC group promiscuous mode
 *				set driver-maintained multicast address count to incoming count
 *			update adapter CAM
 *		update adapter filters
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   Multicast addresses are presented in canonical (LSB) format.
 *
 * Side Effects:
 *   On-board adapter CAM and filters are updated.
 */

static void dfx_ctl_set_multicast_list(struct net_device *dev)
{
	DFX_board_t *bp = netdev_priv(dev);
	int					i;			/* used as index in for loop */
	struct netdev_hw_addr *ha;

	/* Enable LLC frame promiscuous mode, if necessary */

	if (dev->flags & IFF_PROMISC)
		bp->ind_group_prom = PI_FSTATE_K_PASS;		/* Enable LLC ind/group prom mode */

	/* Else, update multicast address table */

	else
		{
		bp->ind_group_prom = PI_FSTATE_K_BLOCK;		/* Disable LLC ind/group prom mode */
		/*
		 * Check whether incoming multicast address count exceeds table size
		 *
		 * Note: The adapters utilize an on-board 64 entry CAM for
		 *       supporting perfect filtering of multicast packets
		 *		 and bridge functions when adding unicast addresses.
		 *		 There is no hash function available.  To support
		 *		 additional multicast addresses, the all multicast
		 *		 filter (LLC group promiscuous mode) must be enabled.
		 *
		 *		 The firmware reserves two CAM entries for SMT-related
		 *		 multicast addresses, which leaves 62 entries available.
		 *		 The following code ensures that we're not being asked
		 *		 to add more than 62 addresses to the CAM.  If we are,
		 *		 the driver will enable the all multicast filter.
		 *		 Should the number of multicast addresses drop below
		 *		 the high water mark, the filter will be disabled and
		 *		 perfect filtering will be used.
		 */

		if (netdev_mc_count(dev) > (PI_CMD_ADDR_FILTER_K_SIZE - bp->uc_count))
			{
			bp->group_prom	= PI_FSTATE_K_PASS;		/* Enable LLC group prom mode */
			bp->mc_count	= 0;					/* Don't add mc addrs to CAM */
			}
		else
			{
			bp->group_prom	= PI_FSTATE_K_BLOCK;	/* Disable LLC group prom mode */
			bp->mc_count	= netdev_mc_count(dev);		/* Add mc addrs to CAM */
			}

		/* Copy addresses to multicast address table, then update adapter CAM */

		i = 0;
		netdev_for_each_mc_addr(ha, dev)
			memcpy(&bp->mc_table[i++ * FDDI_K_ALEN],
			       ha->addr, FDDI_K_ALEN);

		if (dfx_ctl_update_cam(bp) != DFX_K_SUCCESS)
			{
			DBG_printk("%s: Could not update multicast address table!\n", dev->name);
			}
		else
			{
			DBG_printk("%s: Multicast address table updated!  Added %d addresses.\n", dev->name, bp->mc_count);
			}
		}

	/* Update adapter filters */

	if (dfx_ctl_update_filters(bp) != DFX_K_SUCCESS)
		{
		DBG_printk("%s: Could not update adapter filters!\n", dev->name);
		}
	else
		{
		DBG_printk("%s: Adapter filters updated!\n", dev->name);
		}
	}


/*
 * ===========================
 * = dfx_ctl_set_mac_address =
 * ===========================
 *
 * Overview:
 *   Add node address override (unicast address) to adapter
 *   CAM and update dev_addr field in device table.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   dev  - pointer to device information
 *   addr - pointer to sockaddr structure containing unicast address to add
 *
 * Functional Description:
 *   The adapter supports node address overrides by adding one or more
 *   unicast addresses to the adapter CAM.  This is similar to adding
 *   multicast addresses.  In this routine we'll update the driver and
 *   device structures with the new address, then update the adapter CAM
 *   to ensure that the adapter will copy and strip frames destined and
 *   sourced by that address.
 *
 * Return Codes:
 *   Always returns zero.
 *
 * Assumptions:
 *   The address pointed to by addr->sa_data is a valid unicast
 *   address and is presented in canonical (LSB) format.
 *
 * Side Effects:
 *   On-board adapter CAM is updated.  On-board adapter filters
 *   may be updated.
 */

static int dfx_ctl_set_mac_address(struct net_device *dev, void *addr)
	{
	struct sockaddr	*p_sockaddr = (struct sockaddr *)addr;
	DFX_board_t *bp = netdev_priv(dev);

	/* Copy unicast address to driver-maintained structs and update count */

	memcpy(dev->dev_addr, p_sockaddr->sa_data, FDDI_K_ALEN);	/* update device struct */
	memcpy(&bp->uc_table[0], p_sockaddr->sa_data, FDDI_K_ALEN);	/* update driver struct */
	bp->uc_count = 1;

	/*
	 * Verify we're not exceeding the CAM size by adding unicast address
	 *
	 * Note: It's possible that before entering this routine we've
	 *       already filled the CAM with 62 multicast addresses.
	 *		 Since we need to place the node address override into
	 *		 the CAM, we have to check to see that we're not
	 *		 exceeding the CAM size.  If we are, we have to enable
	 *		 the LLC group (multicast) promiscuous mode filter as
	 *		 in dfx_ctl_set_multicast_list.
	 */

	if ((bp->uc_count + bp->mc_count) > PI_CMD_ADDR_FILTER_K_SIZE)
		{
		bp->group_prom	= PI_FSTATE_K_PASS;		/* Enable LLC group prom mode */
		bp->mc_count	= 0;					/* Don't add mc addrs to CAM */

		/* Update adapter filters */

		if (dfx_ctl_update_filters(bp) != DFX_K_SUCCESS)
			{
			DBG_printk("%s: Could not update adapter filters!\n", dev->name);
			}
		else
			{
			DBG_printk("%s: Adapter filters updated!\n", dev->name);
			}
		}

	/* Update adapter CAM with new unicast address */

	if (dfx_ctl_update_cam(bp) != DFX_K_SUCCESS)
		{
		DBG_printk("%s: Could not set new MAC address!\n", dev->name);
		}
	else
		{
		DBG_printk("%s: Adapter CAM updated with new MAC address\n", dev->name);
		}
	return 0;			/* always return zero */
	}


/*
 * ======================
 * = dfx_ctl_update_cam =
 * ======================
 *
 * Overview:
 *   Procedure to update adapter CAM (Content Addressable Memory)
 *   with desired unicast and multicast address entries.
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Updates adapter CAM with current contents of board structure
 *   unicast and multicast address tables.  Since there are only 62
 *   free entries in CAM, this routine ensures that the command
 *   request buffer is not overrun.
 *
 * Return Codes:
 *   DFX_K_SUCCESS - Request succeeded
 *   DFX_K_FAILURE - Request failed
 *
 * Assumptions:
 *   All addresses being added (unicast and multicast) are in canonical
 *   order.
 *
 * Side Effects:
 *   On-board adapter CAM is updated.
 */

static int dfx_ctl_update_cam(DFX_board_t *bp)
	{
	int			i;				/* used as index */
	PI_LAN_ADDR	*p_addr;		/* pointer to CAM entry */

	/*
	 * Fill in command request information
	 *
	 * Note: Even though both the unicast and multicast address
	 *       table entries are stored as contiguous 6 byte entries,
	 *		 the firmware address filter set command expects each
	 *		 entry to be two longwords (8 bytes total).  We must be
	 *		 careful to only copy the six bytes of each unicast and
	 *		 multicast table entry into each command entry.  This
	 *		 is also why we must first clear the entire command
	 *		 request buffer.
	 */

	memset(bp->cmd_req_virt, 0, PI_CMD_REQ_K_SIZE_MAX);	/* first clear buffer */
	bp->cmd_req_virt->cmd_type = PI_CMD_K_ADDR_FILTER_SET;
	p_addr = &bp->cmd_req_virt->addr_filter_set.entry[0];

	/* Now add unicast addresses to command request buffer, if any */

	for (i=0; i < (int)bp->uc_count; i++)
		{
		if (i < PI_CMD_ADDR_FILTER_K_SIZE)
			{
			memcpy(p_addr, &bp->uc_table[i*FDDI_K_ALEN], FDDI_K_ALEN);
			p_addr++;			/* point to next command entry */
			}
		}

	/* Now add multicast addresses to command request buffer, if any */

	for (i=0; i < (int)bp->mc_count; i++)
		{
		if ((i + bp->uc_count) < PI_CMD_ADDR_FILTER_K_SIZE)
			{
			memcpy(p_addr, &bp->mc_table[i*FDDI_K_ALEN], FDDI_K_ALEN);
			p_addr++;			/* point to next command entry */
			}
		}

	/* Issue command to update adapter CAM, then return */

	if (dfx_hw_dma_cmd_req(bp) != DFX_K_SUCCESS)
		return DFX_K_FAILURE;
	return DFX_K_SUCCESS;
	}


/*
 * ==========================
 * = dfx_ctl_update_filters =
 * ==========================
 *
 * Overview:
 *   Procedure to update adapter filters with desired
 *   filter settings.
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Enables or disables filter using current filter settings.
 *
 * Return Codes:
 *   DFX_K_SUCCESS - Request succeeded.
 *   DFX_K_FAILURE - Request failed.
 *
 * Assumptions:
 *   We must always pass up packets destined to the broadcast
 *   address (FF-FF-FF-FF-FF-FF), so we'll always keep the
 *   broadcast filter enabled.
 *
 * Side Effects:
 *   On-board adapter filters are updated.
 */

static int dfx_ctl_update_filters(DFX_board_t *bp)
	{
	int	i = 0;					/* used as index */

	/* Fill in command request information */

	bp->cmd_req_virt->cmd_type = PI_CMD_K_FILTERS_SET;

	/* Initialize Broadcast filter - * ALWAYS ENABLED * */

	bp->cmd_req_virt->filter_set.item[i].item_code	= PI_ITEM_K_BROADCAST;
	bp->cmd_req_virt->filter_set.item[i++].value	= PI_FSTATE_K_PASS;

	/* Initialize LLC Individual/Group Promiscuous filter */

	bp->cmd_req_virt->filter_set.item[i].item_code	= PI_ITEM_K_IND_GROUP_PROM;
	bp->cmd_req_virt->filter_set.item[i++].value	= bp->ind_group_prom;

	/* Initialize LLC Group Promiscuous filter */

	bp->cmd_req_virt->filter_set.item[i].item_code	= PI_ITEM_K_GROUP_PROM;
	bp->cmd_req_virt->filter_set.item[i++].value	= bp->group_prom;

	/* Terminate the item code list */

	bp->cmd_req_virt->filter_set.item[i].item_code	= PI_ITEM_K_EOL;

	/* Issue command to update adapter filters, then return */

	if (dfx_hw_dma_cmd_req(bp) != DFX_K_SUCCESS)
		return DFX_K_FAILURE;
	return DFX_K_SUCCESS;
	}


/*
 * ======================
 * = dfx_hw_dma_cmd_req =
 * ======================
 *
 * Overview:
 *   Sends PDQ DMA command to adapter firmware
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   The command request and response buffers are posted to the adapter in the manner
 *   described in the PDQ Port Specification:
 *
 *		1. Command Response Buffer is posted to adapter.
 *		2. Command Request Buffer is posted to adapter.
 *		3. Command Request consumer index is polled until it indicates that request
 *         buffer has been DMA'd to adapter.
 *		4. Command Response consumer index is polled until it indicates that response
 *         buffer has been DMA'd from adapter.
 *
 *   This ordering ensures that a response buffer is already available for the firmware
 *   to use once it's done processing the request buffer.
 *
 * Return Codes:
 *   DFX_K_SUCCESS	  - DMA command succeeded
 * 	 DFX_K_OUTSTATE   - Adapter is NOT in proper state
 *   DFX_K_HW_TIMEOUT - DMA command timed out
 *
 * Assumptions:
 *   Command request buffer has already been filled with desired DMA command.
 *
 * Side Effects:
 *   None
 */

static int dfx_hw_dma_cmd_req(DFX_board_t *bp)
	{
	int status;			/* adapter status */
	int timeout_cnt;	/* used in for loops */

	/* Make sure the adapter is in a state that we can issue the DMA command in */

	status = dfx_hw_adap_state_rd(bp);
	if ((status == PI_STATE_K_RESET)		||
		(status == PI_STATE_K_HALTED)		||
		(status == PI_STATE_K_DMA_UNAVAIL)	||
		(status == PI_STATE_K_UPGRADE))
		return DFX_K_OUTSTATE;

	/* Put response buffer on the command response queue */

	bp->descr_block_virt->cmd_rsp[bp->cmd_rsp_reg.index.prod].long_0 = (u32) (PI_RCV_DESCR_M_SOP |
			((PI_CMD_RSP_K_SIZE_MAX / PI_ALIGN_K_CMD_RSP_BUFF) << PI_RCV_DESCR_V_SEG_LEN));
	bp->descr_block_virt->cmd_rsp[bp->cmd_rsp_reg.index.prod].long_1 = bp->cmd_rsp_phys;

	/* Bump (and wrap) the producer index and write out to register */

	bp->cmd_rsp_reg.index.prod += 1;
	bp->cmd_rsp_reg.index.prod &= PI_CMD_RSP_K_NUM_ENTRIES-1;
	dfx_port_write_long(bp, PI_PDQ_K_REG_CMD_RSP_PROD, bp->cmd_rsp_reg.lword);

	/* Put request buffer on the command request queue */

	bp->descr_block_virt->cmd_req[bp->cmd_req_reg.index.prod].long_0 = (u32) (PI_XMT_DESCR_M_SOP |
			PI_XMT_DESCR_M_EOP | (PI_CMD_REQ_K_SIZE_MAX << PI_XMT_DESCR_V_SEG_LEN));
	bp->descr_block_virt->cmd_req[bp->cmd_req_reg.index.prod].long_1 = bp->cmd_req_phys;

	/* Bump (and wrap) the producer index and write out to register */

	bp->cmd_req_reg.index.prod += 1;
	bp->cmd_req_reg.index.prod &= PI_CMD_REQ_K_NUM_ENTRIES-1;
	dfx_port_write_long(bp, PI_PDQ_K_REG_CMD_REQ_PROD, bp->cmd_req_reg.lword);

	/*
	 * Here we wait for the command request consumer index to be equal
	 * to the producer, indicating that the adapter has DMAed the request.
	 */

	for (timeout_cnt = 20000; timeout_cnt > 0; timeout_cnt--)
		{
		if (bp->cmd_req_reg.index.prod == (u8)(bp->cons_block_virt->cmd_req))
			break;
		udelay(100);			/* wait for 100 microseconds */
		}
	if (timeout_cnt == 0)
		return DFX_K_HW_TIMEOUT;

	/* Bump (and wrap) the completion index and write out to register */

	bp->cmd_req_reg.index.comp += 1;
	bp->cmd_req_reg.index.comp &= PI_CMD_REQ_K_NUM_ENTRIES-1;
	dfx_port_write_long(bp, PI_PDQ_K_REG_CMD_REQ_PROD, bp->cmd_req_reg.lword);

	/*
	 * Here we wait for the command response consumer index to be equal
	 * to the producer, indicating that the adapter has DMAed the response.
	 */

	for (timeout_cnt = 20000; timeout_cnt > 0; timeout_cnt--)
		{
		if (bp->cmd_rsp_reg.index.prod == (u8)(bp->cons_block_virt->cmd_rsp))
			break;
		udelay(100);			/* wait for 100 microseconds */
		}
	if (timeout_cnt == 0)
		return DFX_K_HW_TIMEOUT;

	/* Bump (and wrap) the completion index and write out to register */

	bp->cmd_rsp_reg.index.comp += 1;
	bp->cmd_rsp_reg.index.comp &= PI_CMD_RSP_K_NUM_ENTRIES-1;
	dfx_port_write_long(bp, PI_PDQ_K_REG_CMD_RSP_PROD, bp->cmd_rsp_reg.lword);
	return DFX_K_SUCCESS;
	}


/*
 * ========================
 * = dfx_hw_port_ctrl_req =
 * ========================
 *
 * Overview:
 *   Sends PDQ port control command to adapter firmware
 *
 * Returns:
 *   Host data register value in host_data if ptr is not NULL
 *
 * Arguments:
 *   bp			- pointer to board information
 *	 command	- port control command
 *	 data_a		- port data A register value
 *	 data_b		- port data B register value
 *	 host_data	- ptr to host data register value
 *
 * Functional Description:
 *   Send generic port control command to adapter by writing
 *   to various PDQ port registers, then polling for completion.
 *
 * Return Codes:
 *   DFX_K_SUCCESS	  - port control command succeeded
 *   DFX_K_HW_TIMEOUT - port control command timed out
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   None
 */

static int dfx_hw_port_ctrl_req(
	DFX_board_t	*bp,
	PI_UINT32	command,
	PI_UINT32	data_a,
	PI_UINT32	data_b,
	PI_UINT32	*host_data
	)

	{
	PI_UINT32	port_cmd;		/* Port Control command register value */
	int			timeout_cnt;	/* used in for loops */

	/* Set Command Error bit in command longword */

	port_cmd = (PI_UINT32) (command | PI_PCTRL_M_CMD_ERROR);

	/* Issue port command to the adapter */

	dfx_port_write_long(bp, PI_PDQ_K_REG_PORT_DATA_A, data_a);
	dfx_port_write_long(bp, PI_PDQ_K_REG_PORT_DATA_B, data_b);
	dfx_port_write_long(bp, PI_PDQ_K_REG_PORT_CTRL, port_cmd);

	/* Now wait for command to complete */

	if (command == PI_PCTRL_M_BLAST_FLASH)
		timeout_cnt = 600000;	/* set command timeout count to 60 seconds */
	else
		timeout_cnt = 20000;	/* set command timeout count to 2 seconds */

	for (; timeout_cnt > 0; timeout_cnt--)
		{
		dfx_port_read_long(bp, PI_PDQ_K_REG_PORT_CTRL, &port_cmd);
		if (!(port_cmd & PI_PCTRL_M_CMD_ERROR))
			break;
		udelay(100);			/* wait for 100 microseconds */
		}
	if (timeout_cnt == 0)
		return DFX_K_HW_TIMEOUT;

	/*
	 * If the address of host_data is non-zero, assume caller has supplied a
	 * non NULL pointer, and return the contents of the HOST_DATA register in
	 * it.
	 */

	if (host_data != NULL)
		dfx_port_read_long(bp, PI_PDQ_K_REG_HOST_DATA, host_data);
	return DFX_K_SUCCESS;
	}


/*
 * =====================
 * = dfx_hw_adap_reset =
 * =====================
 *
 * Overview:
 *   Resets adapter
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp   - pointer to board information
 *   type - type of reset to perform
 *
 * Functional Description:
 *   Issue soft reset to adapter by writing to PDQ Port Reset
 *   register.  Use incoming reset type to tell adapter what
 *   kind of reset operation to perform.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   This routine merely issues a soft reset to the adapter.
 *   It is expected that after this routine returns, the caller
 *   will appropriately poll the Port Status register for the
 *   adapter to enter the proper state.
 *
 * Side Effects:
 *   Internal adapter registers are cleared.
 */

static void dfx_hw_adap_reset(
	DFX_board_t	*bp,
	PI_UINT32	type
	)

	{
	/* Set Reset type and assert reset */

	dfx_port_write_long(bp, PI_PDQ_K_REG_PORT_DATA_A, type);	/* tell adapter type of reset */
	dfx_port_write_long(bp, PI_PDQ_K_REG_PORT_RESET, PI_RESET_M_ASSERT_RESET);

	/* Wait for at least 1 Microsecond according to the spec. We wait 20 just to be safe */

	udelay(20);

	/* Deassert reset */

	dfx_port_write_long(bp, PI_PDQ_K_REG_PORT_RESET, 0);
	}


/*
 * ========================
 * = dfx_hw_adap_state_rd =
 * ========================
 *
 * Overview:
 *   Returns current adapter state
 *
 * Returns:
 *   Adapter state per PDQ Port Specification
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Reads PDQ Port Status register and returns adapter state.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   None
 */

static int dfx_hw_adap_state_rd(DFX_board_t *bp)
	{
	PI_UINT32 port_status;		/* Port Status register value */

	dfx_port_read_long(bp, PI_PDQ_K_REG_PORT_STATUS, &port_status);
	return (port_status & PI_PSTATUS_M_STATE) >> PI_PSTATUS_V_STATE;
	}


/*
 * =====================
 * = dfx_hw_dma_uninit =
 * =====================
 *
 * Overview:
 *   Brings adapter to DMA_UNAVAILABLE state
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   bp   - pointer to board information
 *   type - type of reset to perform
 *
 * Functional Description:
 *   Bring adapter to DMA_UNAVAILABLE state by performing the following:
 *		1. Set reset type bit in Port Data A Register then reset adapter.
 *		2. Check that adapter is in DMA_UNAVAILABLE state.
 *
 * Return Codes:
 *   DFX_K_SUCCESS	  - adapter is in DMA_UNAVAILABLE state
 *   DFX_K_HW_TIMEOUT - adapter did not reset properly
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   Internal adapter registers are cleared.
 */

static int dfx_hw_dma_uninit(DFX_board_t *bp, PI_UINT32 type)
	{
	int timeout_cnt;	/* used in for loops */

	/* Set reset type bit and reset adapter */

	dfx_hw_adap_reset(bp, type);

	/* Now wait for adapter to enter DMA_UNAVAILABLE state */

	for (timeout_cnt = 100000; timeout_cnt > 0; timeout_cnt--)
		{
		if (dfx_hw_adap_state_rd(bp) == PI_STATE_K_DMA_UNAVAIL)
			break;
		udelay(100);					/* wait for 100 microseconds */
		}
	if (timeout_cnt == 0)
		return DFX_K_HW_TIMEOUT;
	return DFX_K_SUCCESS;
	}

/*
 *	Align an sk_buff to a boundary power of 2
 *
 */

static void my_skb_align(struct sk_buff *skb, int n)
{
	unsigned long x = (unsigned long)skb->data;
	unsigned long v;

	v = ALIGN(x, n);	/* Where we want to be */

	skb_reserve(skb, v - x);
}


/*
 * ================
 * = dfx_rcv_init =
 * ================
 *
 * Overview:
 *   Produces buffers to adapter LLC Host receive descriptor block
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *   get_buffers - non-zero if buffers to be allocated
 *
 * Functional Description:
 *   This routine can be called during dfx_adap_init() or during an adapter
 *	 reset.  It initializes the descriptor block and produces all allocated
 *   LLC Host queue receive buffers.
 *
 * Return Codes:
 *   Return 0 on success or -ENOMEM if buffer allocation failed (when using
 *   dynamic buffer allocation). If the buffer allocation failed, the
 *   already allocated buffers will not be released and the caller should do
 *   this.
 *
 * Assumptions:
 *   The PDQ has been reset and the adapter and driver maintained Type 2
 *   register indices are cleared.
 *
 * Side Effects:
 *   Receive buffers are posted to the adapter LLC queue and the adapter
 *   is notified.
 */

static int dfx_rcv_init(DFX_board_t *bp, int get_buffers)
	{
	int	i, j;					/* used in for loop */

	/*
	 *  Since each receive buffer is a single fragment of same length, initialize
	 *  first longword in each receive descriptor for entire LLC Host descriptor
	 *  block.  Also initialize second longword in each receive descriptor with
	 *  physical address of receive buffer.  We'll always allocate receive
	 *  buffers in powers of 2 so that we can easily fill the 256 entry descriptor
	 *  block and produce new receive buffers by simply updating the receive
	 *  producer index.
	 *
	 * 	Assumptions:
	 *		To support all shipping versions of PDQ, the receive buffer size
	 *		must be mod 128 in length and the physical address must be 128 byte
	 *		aligned.  In other words, bits 0-6 of the length and address must
	 *		be zero for the following descriptor field entries to be correct on
	 *		all PDQ-based boards.  We guaranteed both requirements during
	 *		driver initialization when we allocated memory for the receive buffers.
	 */

	if (get_buffers) {
#ifdef DYNAMIC_BUFFERS
	for (i = 0; i < (int)(bp->rcv_bufs_to_post); i++)
		for (j = 0; (i + j) < (int)PI_RCV_DATA_K_NUM_ENTRIES; j += bp->rcv_bufs_to_post)
		{
			struct sk_buff *newskb = __netdev_alloc_skb(bp->dev, NEW_SKB_SIZE, GFP_NOIO);
			if (!newskb)
				return -ENOMEM;
			bp->descr_block_virt->rcv_data[i+j].long_0 = (u32) (PI_RCV_DESCR_M_SOP |
				((PI_RCV_DATA_K_SIZE_MAX / PI_ALIGN_K_RCV_DATA_BUFF) << PI_RCV_DESCR_V_SEG_LEN));
			/*
			 * align to 128 bytes for compatibility with
			 * the old EISA boards.
			 */

			my_skb_align(newskb, 128);
			bp->descr_block_virt->rcv_data[i + j].long_1 =
				(u32)dma_map_single(bp->bus_dev, newskb->data,
						    NEW_SKB_SIZE,
						    DMA_FROM_DEVICE);
			/*
			 * p_rcv_buff_va is only used inside the
			 * kernel so we put the skb pointer here.
			 */
			bp->p_rcv_buff_va[i+j] = (char *) newskb;
		}
#else
	for (i=0; i < (int)(bp->rcv_bufs_to_post); i++)
		for (j=0; (i + j) < (int)PI_RCV_DATA_K_NUM_ENTRIES; j += bp->rcv_bufs_to_post)
			{
			bp->descr_block_virt->rcv_data[i+j].long_0 = (u32) (PI_RCV_DESCR_M_SOP |
				((PI_RCV_DATA_K_SIZE_MAX / PI_ALIGN_K_RCV_DATA_BUFF) << PI_RCV_DESCR_V_SEG_LEN));
			bp->descr_block_virt->rcv_data[i+j].long_1 = (u32) (bp->rcv_block_phys + (i * PI_RCV_DATA_K_SIZE_MAX));
			bp->p_rcv_buff_va[i+j] = (bp->rcv_block_virt + (i * PI_RCV_DATA_K_SIZE_MAX));
			}
#endif
	}

	/* Update receive producer and Type 2 register */

	bp->rcv_xmt_reg.index.rcv_prod = bp->rcv_bufs_to_post;
	dfx_port_write_long(bp, PI_PDQ_K_REG_TYPE_2_PROD, bp->rcv_xmt_reg.lword);
	return 0;
	}


/*
 * =========================
 * = dfx_rcv_queue_process =
 * =========================
 *
 * Overview:
 *   Process received LLC frames.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Received LLC frames are processed until there are no more consumed frames.
 *   Once all frames are processed, the receive buffers are returned to the
 *   adapter.  Note that this algorithm fixes the length of time that can be spent
 *   in this routine, because there are a fixed number of receive buffers to
 *   process and buffers are not produced until this routine exits and returns
 *   to the ISR.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   None
 *
 * Side Effects:
 *   None
 */

static void dfx_rcv_queue_process(
	DFX_board_t *bp
	)

	{
	PI_TYPE_2_CONSUMER	*p_type_2_cons;		/* ptr to rcv/xmt consumer block register */
	char				*p_buff;			/* ptr to start of packet receive buffer (FMC descriptor) */
	u32					descr, pkt_len;		/* FMC descriptor field and packet length */
	struct sk_buff		*skb;				/* pointer to a sk_buff to hold incoming packet data */

	/* Service all consumed LLC receive frames */

	p_type_2_cons = (PI_TYPE_2_CONSUMER *)(&bp->cons_block_virt->xmt_rcv_data);
	while (bp->rcv_xmt_reg.index.rcv_comp != p_type_2_cons->index.rcv_cons)
		{
		/* Process any errors */

		int entry;

		entry = bp->rcv_xmt_reg.index.rcv_comp;
#ifdef DYNAMIC_BUFFERS
		p_buff = (char *) (((struct sk_buff *)bp->p_rcv_buff_va[entry])->data);
#else
		p_buff = bp->p_rcv_buff_va[entry];
#endif
		memcpy(&descr, p_buff + RCV_BUFF_K_DESCR, sizeof(u32));

		if (descr & PI_FMC_DESCR_M_RCC_FLUSH)
			{
			if (descr & PI_FMC_DESCR_M_RCC_CRC)
				bp->rcv_crc_errors++;
			else
				bp->rcv_frame_status_errors++;
			}
		else
		{
			int rx_in_place = 0;

			/* The frame was received without errors - verify packet length */

			pkt_len = (u32)((descr & PI_FMC_DESCR_M_LEN) >> PI_FMC_DESCR_V_LEN);
			pkt_len -= 4;				/* subtract 4 byte CRC */
			if (!IN_RANGE(pkt_len, FDDI_K_LLC_ZLEN, FDDI_K_LLC_LEN))
				bp->rcv_length_errors++;
			else{
#ifdef DYNAMIC_BUFFERS
				if (pkt_len > SKBUFF_RX_COPYBREAK) {
					struct sk_buff *newskb;

					newskb = dev_alloc_skb(NEW_SKB_SIZE);
					if (newskb){
						rx_in_place = 1;

						my_skb_align(newskb, 128);
						skb = (struct sk_buff *)bp->p_rcv_buff_va[entry];
						dma_unmap_single(bp->bus_dev,
							bp->descr_block_virt->rcv_data[entry].long_1,
							NEW_SKB_SIZE,
							DMA_FROM_DEVICE);
						skb_reserve(skb, RCV_BUFF_K_PADDING);
						bp->p_rcv_buff_va[entry] = (char *)newskb;
						bp->descr_block_virt->rcv_data[entry].long_1 =
							(u32)dma_map_single(bp->bus_dev,
								newskb->data,
								NEW_SKB_SIZE,
								DMA_FROM_DEVICE);
					} else
						skb = NULL;
				} else
#endif
					skb = dev_alloc_skb(pkt_len+3);	/* alloc new buffer to pass up, add room for PRH */
				if (skb == NULL)
					{
					printk("%s: Could not allocate receive buffer.  Dropping packet.\n", bp->dev->name);
					bp->rcv_discards++;
					break;
					}
				else {
#ifndef DYNAMIC_BUFFERS
					if (! rx_in_place)
#endif
					{
						/* Receive buffer allocated, pass receive packet up */

						skb_copy_to_linear_data(skb,
							       p_buff + RCV_BUFF_K_PADDING,
							       pkt_len + 3);
					}

					skb_reserve(skb,3);		/* adjust data field so that it points to FC byte */
					skb_put(skb, pkt_len);		/* pass up packet length, NOT including CRC */
					skb->protocol = fddi_type_trans(skb, bp->dev);
					bp->rcv_total_bytes += skb->len;
					netif_rx(skb);

					/* Update the rcv counters */
					bp->rcv_total_frames++;
					if (*(p_buff + RCV_BUFF_K_DA) & 0x01)
						bp->rcv_multicast_frames++;
				}
			}
			}

		/*
		 * Advance the producer (for recycling) and advance the completion
		 * (for servicing received frames).  Note that it is okay to
		 * advance the producer without checking that it passes the
		 * completion index because they are both advanced at the same
		 * rate.
		 */

		bp->rcv_xmt_reg.index.rcv_prod += 1;
		bp->rcv_xmt_reg.index.rcv_comp += 1;
		}
	}


/*
 * =====================
 * = dfx_xmt_queue_pkt =
 * =====================
 *
 * Overview:
 *   Queues packets for transmission
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   skb - pointer to sk_buff to queue for transmission
 *   dev - pointer to device information
 *
 * Functional Description:
 *   Here we assume that an incoming skb transmit request
 *   is contained in a single physically contiguous buffer
 *   in which the virtual address of the start of packet
 *   (skb->data) can be converted to a physical address
 *   by using pci_map_single().
 *
 *   Since the adapter architecture requires a three byte
 *   packet request header to prepend the start of packet,
 *   we'll write the three byte field immediately prior to
 *   the FC byte.  This assumption is valid because we've
 *   ensured that dev->hard_header_len includes three pad
 *   bytes.  By posting a single fragment to the adapter,
 *   we'll reduce the number of descriptor fetches and
 *   bus traffic needed to send the request.
 *
 *   Also, we can't free the skb until after it's been DMA'd
 *   out by the adapter, so we'll queue it in the driver and
 *   return it in dfx_xmt_done.
 *
 * Return Codes:
 *   0 - driver queued packet, link is unavailable, or skbuff was bad
 *	 1 - caller should requeue the sk_buff for later transmission
 *
 * Assumptions:
 *	 First and foremost, we assume the incoming skb pointer
 *   is NOT NULL and is pointing to a valid sk_buff structure.
 *
 *   The outgoing packet is complete, starting with the
 *   frame control byte including the last byte of data,
 *   but NOT including the 4 byte CRC.  We'll let the
 *   adapter hardware generate and append the CRC.
 *
 *   The entire packet is stored in one physically
 *   contiguous buffer which is not cached and whose
 *   32-bit physical address can be determined.
 *
 *   It's vital that this routine is NOT reentered for the
 *   same board and that the OS is not in another section of
 *   code (eg. dfx_int_common) for the same board on a
 *   different thread.
 *
 * Side Effects:
 *   None
 */

static netdev_tx_t dfx_xmt_queue_pkt(struct sk_buff *skb,
				     struct net_device *dev)
	{
	DFX_board_t		*bp = netdev_priv(dev);
	u8			prod;				/* local transmit producer index */
	PI_XMT_DESCR		*p_xmt_descr;		/* ptr to transmit descriptor block entry */
	XMT_DRIVER_DESCR	*p_xmt_drv_descr;	/* ptr to transmit driver descriptor */
	unsigned long		flags;

	netif_stop_queue(dev);

	/*
	 * Verify that incoming transmit request is OK
	 *
	 * Note: The packet size check is consistent with other
	 *		 Linux device drivers, although the correct packet
	 *		 size should be verified before calling the
	 *		 transmit routine.
	 */

	if (!IN_RANGE(skb->len, FDDI_K_LLC_ZLEN, FDDI_K_LLC_LEN))
	{
		printk("%s: Invalid packet length - %u bytes\n",
			dev->name, skb->len);
		bp->xmt_length_errors++;		/* bump error counter */
		netif_wake_queue(dev);
		dev_kfree_skb(skb);
		return NETDEV_TX_OK;			/* return "success" */
	}
	/*
	 * See if adapter link is available, if not, free buffer
	 *
	 * Note: If the link isn't available, free buffer and return 0
	 *		 rather than tell the upper layer to requeue the packet.
	 *		 The methodology here is that by the time the link
	 *		 becomes available, the packet to be sent will be
	 *		 fairly stale.  By simply dropping the packet, the
	 *		 higher layer protocols will eventually time out
	 *		 waiting for response packets which it won't receive.
	 */

	if (bp->link_available == PI_K_FALSE)
		{
		if (dfx_hw_adap_state_rd(bp) == PI_STATE_K_LINK_AVAIL)	/* is link really available? */
			bp->link_available = PI_K_TRUE;		/* if so, set flag and continue */
		else
			{
			bp->xmt_discards++;					/* bump error counter */
			dev_kfree_skb(skb);		/* free sk_buff now */
			netif_wake_queue(dev);
			return NETDEV_TX_OK;		/* return "success" */
			}
		}

	spin_lock_irqsave(&bp->lock, flags);

	/* Get the current producer and the next free xmt data descriptor */

	prod		= bp->rcv_xmt_reg.index.xmt_prod;
	p_xmt_descr = &(bp->descr_block_virt->xmt_data[prod]);

	/*
	 * Get pointer to auxiliary queue entry to contain information
	 * for this packet.
	 *
	 * Note: The current xmt producer index will become the
	 *	 current xmt completion index when we complete this
	 *	 packet later on.  So, we'll get the pointer to the
	 *	 next auxiliary queue entry now before we bump the
	 *	 producer index.
	 */

	p_xmt_drv_descr = &(bp->xmt_drv_descr_blk[prod++]);	/* also bump producer index */

	/* Write the three PRH bytes immediately before the FC byte */

	skb_push(skb,3);
	skb->data[0] = DFX_PRH0_BYTE;	/* these byte values are defined */
	skb->data[1] = DFX_PRH1_BYTE;	/* in the Motorola FDDI MAC chip */
	skb->data[2] = DFX_PRH2_BYTE;	/* specification */

	/*
	 * Write the descriptor with buffer info and bump producer
	 *
	 * Note: Since we need to start DMA from the packet request
	 *		 header, we'll add 3 bytes to the DMA buffer length,
	 *		 and we'll determine the physical address of the
	 *		 buffer from the PRH, not skb->data.
	 *
	 * Assumptions:
	 *		 1. Packet starts with the frame control (FC) byte
	 *		    at skb->data.
	 *		 2. The 4-byte CRC is not appended to the buffer or
	 *			included in the length.
	 *		 3. Packet length (skb->len) is from FC to end of
	 *			data, inclusive.
	 *		 4. The packet length does not exceed the maximum
	 *			FDDI LLC frame length of 4491 bytes.
	 *		 5. The entire packet is contained in a physically
	 *			contiguous, non-cached, locked memory space
	 *			comprised of a single buffer pointed to by
	 *			skb->data.
	 *		 6. The physical address of the start of packet
	 *			can be determined from the virtual address
	 *			by using pci_map_single() and is only 32-bits
	 *			wide.
	 */

	p_xmt_descr->long_0	= (u32) (PI_XMT_DESCR_M_SOP | PI_XMT_DESCR_M_EOP | ((skb->len) << PI_XMT_DESCR_V_SEG_LEN));
	p_xmt_descr->long_1 = (u32)dma_map_single(bp->bus_dev, skb->data,
						  skb->len, DMA_TO_DEVICE);

	/*
	 * Verify that descriptor is actually available
	 *
	 * Note: If descriptor isn't available, return 1 which tells
	 *	 the upper layer to requeue the packet for later
	 *	 transmission.
	 *
	 *       We need to ensure that the producer never reaches the
	 *	 completion, except to indicate that the queue is empty.
	 */

	if (prod == bp->rcv_xmt_reg.index.xmt_comp)
	{
		skb_pull(skb,3);
		spin_unlock_irqrestore(&bp->lock, flags);
		return NETDEV_TX_BUSY;	/* requeue packet for later */
	}

	/*
	 * Save info for this packet for xmt done indication routine
	 *
	 * Normally, we'd save the producer index in the p_xmt_drv_descr
	 * structure so that we'd have it handy when we complete this
	 * packet later (in dfx_xmt_done).  However, since the current
	 * transmit architecture guarantees a single fragment for the
	 * entire packet, we can simply bump the completion index by
	 * one (1) for each completed packet.
	 *
	 * Note: If this assumption changes and we're presented with
	 *	 an inconsistent number of transmit fragments for packet
	 *	 data, we'll need to modify this code to save the current
	 *	 transmit producer index.
	 */

	p_xmt_drv_descr->p_skb = skb;

	/* Update Type 2 register */

	bp->rcv_xmt_reg.index.xmt_prod = prod;
	dfx_port_write_long(bp, PI_PDQ_K_REG_TYPE_2_PROD, bp->rcv_xmt_reg.lword);
	spin_unlock_irqrestore(&bp->lock, flags);
	netif_wake_queue(dev);
	return NETDEV_TX_OK;	/* packet queued to adapter */
	}


/*
 * ================
 * = dfx_xmt_done =
 * ================
 *
 * Overview:
 *   Processes all frames that have been transmitted.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   For all consumed transmit descriptors that have not
 *   yet been completed, we'll free the skb we were holding
 *   onto using dev_kfree_skb and bump the appropriate
 *   counters.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   The Type 2 register is not updated in this routine.  It is
 *   assumed that it will be updated in the ISR when dfx_xmt_done
 *   returns.
 *
 * Side Effects:
 *   None
 */

static int dfx_xmt_done(DFX_board_t *bp)
	{
	XMT_DRIVER_DESCR	*p_xmt_drv_descr;	/* ptr to transmit driver descriptor */
	PI_TYPE_2_CONSUMER	*p_type_2_cons;		/* ptr to rcv/xmt consumer block register */
	u8			comp;			/* local transmit completion index */
	int 			freed = 0;		/* buffers freed */

	/* Service all consumed transmit frames */

	p_type_2_cons = (PI_TYPE_2_CONSUMER *)(&bp->cons_block_virt->xmt_rcv_data);
	while (bp->rcv_xmt_reg.index.xmt_comp != p_type_2_cons->index.xmt_cons)
		{
		/* Get pointer to the transmit driver descriptor block information */

		p_xmt_drv_descr = &(bp->xmt_drv_descr_blk[bp->rcv_xmt_reg.index.xmt_comp]);

		/* Increment transmit counters */

		bp->xmt_total_frames++;
		bp->xmt_total_bytes += p_xmt_drv_descr->p_skb->len;

		/* Return skb to operating system */
		comp = bp->rcv_xmt_reg.index.xmt_comp;
		dma_unmap_single(bp->bus_dev,
				 bp->descr_block_virt->xmt_data[comp].long_1,
				 p_xmt_drv_descr->p_skb->len,
				 DMA_TO_DEVICE);
		dev_kfree_skb_irq(p_xmt_drv_descr->p_skb);

		/*
		 * Move to start of next packet by updating completion index
		 *
		 * Here we assume that a transmit packet request is always
		 * serviced by posting one fragment.  We can therefore
		 * simplify the completion code by incrementing the
		 * completion index by one.  This code will need to be
		 * modified if this assumption changes.  See comments
		 * in dfx_xmt_queue_pkt for more details.
		 */

		bp->rcv_xmt_reg.index.xmt_comp += 1;
		freed++;
		}
	return freed;
	}


/*
 * =================
 * = dfx_rcv_flush =
 * =================
 *
 * Overview:
 *   Remove all skb's in the receive ring.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   Free's all the dynamically allocated skb's that are
 *   currently attached to the device receive ring. This
 *   function is typically only used when the device is
 *   initialized or reinitialized.
 *
 * Return Codes:
 *   None
 *
 * Side Effects:
 *   None
 */
#ifdef DYNAMIC_BUFFERS
static void dfx_rcv_flush( DFX_board_t *bp )
	{
	int i, j;

	for (i = 0; i < (int)(bp->rcv_bufs_to_post); i++)
		for (j = 0; (i + j) < (int)PI_RCV_DATA_K_NUM_ENTRIES; j += bp->rcv_bufs_to_post)
		{
			struct sk_buff *skb;
			skb = (struct sk_buff *)bp->p_rcv_buff_va[i+j];
			if (skb)
				dev_kfree_skb(skb);
			bp->p_rcv_buff_va[i+j] = NULL;
		}

	}
#else
static inline void dfx_rcv_flush( DFX_board_t *bp )
{
}
#endif /* DYNAMIC_BUFFERS */

/*
 * =================
 * = dfx_xmt_flush =
 * =================
 *
 * Overview:
 *   Processes all frames whether they've been transmitted
 *   or not.
 *
 * Returns:
 *   None
 *
 * Arguments:
 *   bp - pointer to board information
 *
 * Functional Description:
 *   For all produced transmit descriptors that have not
 *   yet been completed, we'll free the skb we were holding
 *   onto using dev_kfree_skb and bump the appropriate
 *   counters.  Of course, it's possible that some of
 *   these transmit requests actually did go out, but we
 *   won't make that distinction here.  Finally, we'll
 *   update the consumer index to match the producer.
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   This routine does NOT update the Type 2 register.  It
 *   is assumed that this routine is being called during a
 *   transmit flush interrupt, or a shutdown or close routine.
 *
 * Side Effects:
 *   None
 */

static void dfx_xmt_flush( DFX_board_t *bp )
	{
	u32			prod_cons;		/* rcv/xmt consumer block longword */
	XMT_DRIVER_DESCR	*p_xmt_drv_descr;	/* ptr to transmit driver descriptor */
	u8			comp;			/* local transmit completion index */

	/* Flush all outstanding transmit frames */

	while (bp->rcv_xmt_reg.index.xmt_comp != bp->rcv_xmt_reg.index.xmt_prod)
		{
		/* Get pointer to the transmit driver descriptor block information */

		p_xmt_drv_descr = &(bp->xmt_drv_descr_blk[bp->rcv_xmt_reg.index.xmt_comp]);

		/* Return skb to operating system */
		comp = bp->rcv_xmt_reg.index.xmt_comp;
		dma_unmap_single(bp->bus_dev,
				 bp->descr_block_virt->xmt_data[comp].long_1,
				 p_xmt_drv_descr->p_skb->len,
				 DMA_TO_DEVICE);
		dev_kfree_skb(p_xmt_drv_descr->p_skb);

		/* Increment transmit error counter */

		bp->xmt_discards++;

		/*
		 * Move to start of next packet by updating completion index
		 *
		 * Here we assume that a transmit packet request is always
		 * serviced by posting one fragment.  We can therefore
		 * simplify the completion code by incrementing the
		 * completion index by one.  This code will need to be
		 * modified if this assumption changes.  See comments
		 * in dfx_xmt_queue_pkt for more details.
		 */

		bp->rcv_xmt_reg.index.xmt_comp += 1;
		}

	/* Update the transmit consumer index in the consumer block */

	prod_cons = (u32)(bp->cons_block_virt->xmt_rcv_data & ~PI_CONS_M_XMT_INDEX);
	prod_cons |= (u32)(bp->rcv_xmt_reg.index.xmt_prod << PI_CONS_V_XMT_INDEX);
	bp->cons_block_virt->xmt_rcv_data = prod_cons;
	}

/*
 * ==================
 * = dfx_unregister =
 * ==================
 *
 * Overview:
 *   Shuts down an FDDI controller
 *
 * Returns:
 *   Condition code
 *
 * Arguments:
 *   bdev - pointer to device information
 *
 * Functional Description:
 *
 * Return Codes:
 *   None
 *
 * Assumptions:
 *   It compiles so it should work :-( (PCI cards do :-)
 *
 * Side Effects:
 *   Device structures for FDDI adapters (fddi0, fddi1, etc) are
 *   freed.
 */
static void dfx_unregister(struct device *bdev)
{
	struct net_device *dev = dev_get_drvdata(bdev);
	DFX_board_t *bp = netdev_priv(dev);
	int dfx_bus_pci = DFX_BUS_PCI(bdev);
	int dfx_bus_tc = DFX_BUS_TC(bdev);
	int dfx_use_mmio = DFX_MMIO || dfx_bus_tc;
	resource_size_t bar_start = 0;		/* pointer to port */
	resource_size_t bar_len = 0;		/* resource length */
	int		alloc_size;		/* total buffer size used */

	unregister_netdev(dev);

	alloc_size = sizeof(PI_DESCR_BLOCK) +
		     PI_CMD_REQ_K_SIZE_MAX + PI_CMD_RSP_K_SIZE_MAX +
#ifndef DYNAMIC_BUFFERS
		     (bp->rcv_bufs_to_post * PI_RCV_DATA_K_SIZE_MAX) +
#endif
		     sizeof(PI_CONSUMER_BLOCK) +
		     (PI_ALIGN_K_DESC_BLK - 1);
	if (bp->kmalloced)
		dma_free_coherent(bdev, alloc_size,
				  bp->kmalloced, bp->kmalloced_dma);

	dfx_bus_uninit(dev);

	dfx_get_bars(bdev, &bar_start, &bar_len);
	if (dfx_use_mmio) {
		iounmap(bp->base.mem);
		release_mem_region(bar_start, bar_len);
	} else
		release_region(bar_start, bar_len);

	if (dfx_bus_pci)
		pci_disable_device(to_pci_dev(bdev));

	free_netdev(dev);
}


static int __maybe_unused dfx_dev_register(struct device *);
static int __maybe_unused dfx_dev_unregister(struct device *);

#ifdef CONFIG_PCI
static int dfx_pci_register(struct pci_dev *, const struct pci_device_id *);
static void dfx_pci_unregister(struct pci_dev *);

static DEFINE_PCI_DEVICE_TABLE(dfx_pci_table) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_FDDI) },
	{ }
};
MODULE_DEVICE_TABLE(pci, dfx_pci_table);

static struct pci_driver dfx_pci_driver = {
	.name		= "defxx",
	.id_table	= dfx_pci_table,
	.probe		= dfx_pci_register,
	.remove		= dfx_pci_unregister,
};

static int dfx_pci_register(struct pci_dev *pdev,
			    const struct pci_device_id *ent)
{
	return dfx_register(&pdev->dev);
}

static void dfx_pci_unregister(struct pci_dev *pdev)
{
	dfx_unregister(&pdev->dev);
}
#endif /* CONFIG_PCI */

#ifdef CONFIG_EISA
static struct eisa_device_id dfx_eisa_table[] = {
        { "DEC3001", DEFEA_PROD_ID_1 },
        { "DEC3002", DEFEA_PROD_ID_2 },
        { "DEC3003", DEFEA_PROD_ID_3 },
        { "DEC3004", DEFEA_PROD_ID_4 },
        { }
};
MODULE_DEVICE_TABLE(eisa, dfx_eisa_table);

static struct eisa_driver dfx_eisa_driver = {
	.id_table	= dfx_eisa_table,
	.driver		= {
		.name	= "defxx",
		.bus	= &eisa_bus_type,
		.probe	= dfx_dev_register,
		.remove	= dfx_dev_unregister,
	},
};
#endif /* CONFIG_EISA */

#ifdef CONFIG_TC
static struct tc_device_id const dfx_tc_table[] = {
	{ "DEC     ", "PMAF-FA " },
	{ "DEC     ", "PMAF-FD " },
	{ "DEC     ", "PMAF-FS " },
	{ "DEC     ", "PMAF-FU " },
	{ }
};
MODULE_DEVICE_TABLE(tc, dfx_tc_table);

static struct tc_driver dfx_tc_driver = {
	.id_table	= dfx_tc_table,
	.driver		= {
		.name	= "defxx",
		.bus	= &tc_bus_type,
		.probe	= dfx_dev_register,
		.remove	= dfx_dev_unregister,
	},
};
#endif /* CONFIG_TC */

static int __maybe_unused dfx_dev_register(struct device *dev)
{
	int status;

	status = dfx_register(dev);
	if (!status)
		get_device(dev);
	return status;
}

static int __maybe_unused dfx_dev_unregister(struct device *dev)
{
	put_device(dev);
	dfx_unregister(dev);
	return 0;
}


static int dfx_init(void)
{
	int status;

	status = pci_register_driver(&dfx_pci_driver);
	if (!status)
		status = eisa_driver_register(&dfx_eisa_driver);
	if (!status)
		status = tc_register_driver(&dfx_tc_driver);
	return status;
}

static void dfx_cleanup(void)
{
	tc_unregister_driver(&dfx_tc_driver);
	eisa_driver_unregister(&dfx_eisa_driver);
	pci_unregister_driver(&dfx_pci_driver);
}

module_init(dfx_init);
module_exit(dfx_cleanup);
MODULE_AUTHOR("Lawrence V. Stefani");
MODULE_DESCRIPTION("DEC FDDIcontroller TC/EISA/PCI (DEFTA/DEFEA/DEFPA) driver "
		   DRV_VERSION " " DRV_RELDATE);
MODULE_LICENSE("GPL");