aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/pcnet32.c
blob: 5d9be50fd982540e8aa956bb08ad4e3f3a9c9893 (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
/* pcnet32.c: An AMD PCnet32 ethernet driver for linux. */
/*
 *	Copyright 1996-1999 Thomas Bogendoerfer
 *
 *	Derived from the lance driver written 1993,1994,1995 by Donald Becker.
 *
 *	Copyright 1993 United States Government as represented by the
 *	Director, National Security Agency.
 *
 *	This software may be used and distributed according to the terms
 *	of the GNU General Public License, incorporated herein by reference.
 *
 *	This driver is for PCnet32 and PCnetPCI based ethercards
 */
/**************************************************************************
 *  23 Oct, 2000.
 *  Fixed a few bugs, related to running the controller in 32bit mode.
 *
 *  Carsten Langgaard, carstenl@mips.com
 *  Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *************************************************************************/

#define DRV_NAME	"pcnet32"
#define DRV_VERSION	"1.32"
#define DRV_RELDATE	"18.Mar.2006"
#define PFX		DRV_NAME ": "

static const char *const version =
    DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " tsbogend@alpha.franken.de\n";

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/crc32.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/moduleparam.h>
#include <linux/bitops.h>

#include <asm/dma.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/irq.h>

/*
 * PCI device identifiers for "new style" Linux PCI Device Drivers
 */
static struct pci_device_id pcnet32_pci_tbl[] = {
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE_HOME,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE,
	  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},

	/*
	 * Adapters that were sold with IBM's RS/6000 or pSeries hardware have
	 * the incorrect vendor id.
	 */
	{ PCI_VENDOR_ID_TRIDENT, PCI_DEVICE_ID_AMD_LANCE,
	  PCI_ANY_ID, PCI_ANY_ID,
	  PCI_CLASS_NETWORK_ETHERNET << 8, 0xffff00, 0},

	{ }	/* terminate list */
};

MODULE_DEVICE_TABLE(pci, pcnet32_pci_tbl);

static int cards_found;

/*
 * VLB I/O addresses
 */
static unsigned int pcnet32_portlist[] __initdata =
    { 0x300, 0x320, 0x340, 0x360, 0 };

static int pcnet32_debug = 0;
static int tx_start = 1;	/* Mapping -- 0:20, 1:64, 2:128, 3:~220 (depends on chip vers) */
static int pcnet32vlb;		/* check for VLB cards ? */

static struct net_device *pcnet32_dev;

static int max_interrupt_work = 2;
static int rx_copybreak = 200;

#define PCNET32_PORT_AUI      0x00
#define PCNET32_PORT_10BT     0x01
#define PCNET32_PORT_GPSI     0x02
#define PCNET32_PORT_MII      0x03

#define PCNET32_PORT_PORTSEL  0x03
#define PCNET32_PORT_ASEL     0x04
#define PCNET32_PORT_100      0x40
#define PCNET32_PORT_FD	      0x80

#define PCNET32_DMA_MASK 0xffffffff

#define PCNET32_WATCHDOG_TIMEOUT (jiffies + (2 * HZ))
#define PCNET32_BLINK_TIMEOUT	(jiffies + (HZ/4))

/*
 * table to translate option values from tulip
 * to internal options
 */
static const unsigned char options_mapping[] = {
	PCNET32_PORT_ASEL,			/*  0 Auto-select      */
	PCNET32_PORT_AUI,			/*  1 BNC/AUI          */
	PCNET32_PORT_AUI,			/*  2 AUI/BNC          */
	PCNET32_PORT_ASEL,			/*  3 not supported    */
	PCNET32_PORT_10BT | PCNET32_PORT_FD,	/*  4 10baseT-FD       */
	PCNET32_PORT_ASEL,			/*  5 not supported    */
	PCNET32_PORT_ASEL,			/*  6 not supported    */
	PCNET32_PORT_ASEL,			/*  7 not supported    */
	PCNET32_PORT_ASEL,			/*  8 not supported    */
	PCNET32_PORT_MII,			/*  9 MII 10baseT      */
	PCNET32_PORT_MII | PCNET32_PORT_FD,	/* 10 MII 10baseT-FD   */
	PCNET32_PORT_MII,			/* 11 MII (autosel)    */
	PCNET32_PORT_10BT,			/* 12 10BaseT          */
	PCNET32_PORT_MII | PCNET32_PORT_100,	/* 13 MII 100BaseTx    */
						/* 14 MII 100BaseTx-FD */
	PCNET32_PORT_MII | PCNET32_PORT_100 | PCNET32_PORT_FD,
	PCNET32_PORT_ASEL			/* 15 not supported    */
};

static const char pcnet32_gstrings_test[][ETH_GSTRING_LEN] = {
	"Loopback test  (offline)"
};

#define PCNET32_TEST_LEN (sizeof(pcnet32_gstrings_test) / ETH_GSTRING_LEN)

#define PCNET32_NUM_REGS 136

#define MAX_UNITS 8		/* More are supported, limit only on options */
static int options[MAX_UNITS];
static int full_duplex[MAX_UNITS];
static int homepna[MAX_UNITS];

/*
 *				Theory of Operation
 *
 * This driver uses the same software structure as the normal lance
 * driver. So look for a verbose description in lance.c. The differences
 * to the normal lance driver is the use of the 32bit mode of PCnet32
 * and PCnetPCI chips. Because these chips are 32bit chips, there is no
 * 16MB limitation and we don't need bounce buffers.
 */

/*
 * Set the number of Tx and Rx buffers, using Log_2(# buffers).
 * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
 * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
 */
#ifndef PCNET32_LOG_TX_BUFFERS
#define PCNET32_LOG_TX_BUFFERS		4
#define PCNET32_LOG_RX_BUFFERS		5
#define PCNET32_LOG_MAX_TX_BUFFERS	9	/* 2^9 == 512 */
#define PCNET32_LOG_MAX_RX_BUFFERS	9
#endif

#define TX_RING_SIZE		(1 << (PCNET32_LOG_TX_BUFFERS))
#define TX_MAX_RING_SIZE	(1 << (PCNET32_LOG_MAX_TX_BUFFERS))

#define RX_RING_SIZE		(1 << (PCNET32_LOG_RX_BUFFERS))
#define RX_MAX_RING_SIZE	(1 << (PCNET32_LOG_MAX_RX_BUFFERS))

#define PKT_BUF_SZ		1544

/* Offsets from base I/O address. */
#define PCNET32_WIO_RDP		0x10
#define PCNET32_WIO_RAP		0x12
#define PCNET32_WIO_RESET	0x14
#define PCNET32_WIO_BDP		0x16

#define PCNET32_DWIO_RDP	0x10
#define PCNET32_DWIO_RAP	0x14
#define PCNET32_DWIO_RESET	0x18
#define PCNET32_DWIO_BDP	0x1C

#define PCNET32_TOTAL_SIZE	0x20

/* The PCNET32 Rx and Tx ring descriptors. */
struct pcnet32_rx_head {
	u32	base;
	s16	buf_length;
	s16	status;
	u32	msg_length;
	u32	reserved;
};

struct pcnet32_tx_head {
	u32	base;
	s16	length;
	s16	status;
	u32	misc;
	u32	reserved;
};

/* The PCNET32 32-Bit initialization block, described in databook. */
struct pcnet32_init_block {
	u16	mode;
	u16	tlen_rlen;
	u8	phys_addr[6];
	u16	reserved;
	u32	filter[2];
	/* Receive and transmit ring base, along with extra bits. */
	u32	rx_ring;
	u32	tx_ring;
};

/* PCnet32 access functions */
struct pcnet32_access {
	u16	(*read_csr) (unsigned long, int);
	void	(*write_csr) (unsigned long, int, u16);
	u16	(*read_bcr) (unsigned long, int);
	void	(*write_bcr) (unsigned long, int, u16);
	u16	(*read_rap) (unsigned long);
	void	(*write_rap) (unsigned long, u16);
	void	(*reset) (unsigned long);
};

/*
 * The first field of pcnet32_private is read by the ethernet device
 * so the structure should be allocated using pci_alloc_consistent().
 */
struct pcnet32_private {
	struct pcnet32_init_block init_block;
	/* The Tx and Rx ring entries must be aligned on 16-byte boundaries in 32bit mode. */
	struct pcnet32_rx_head	*rx_ring;
	struct pcnet32_tx_head	*tx_ring;
	dma_addr_t		dma_addr;/* DMA address of beginning of this
				   object, returned by pci_alloc_consistent */
	struct pci_dev		*pci_dev;
	const char		*name;
	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
	struct sk_buff		**tx_skbuff;
	struct sk_buff		**rx_skbuff;
	dma_addr_t		*tx_dma_addr;
	dma_addr_t		*rx_dma_addr;
	struct pcnet32_access	a;
	spinlock_t		lock;		/* Guard lock */
	unsigned int		cur_rx, cur_tx;	/* The next free ring entry */
	unsigned int		rx_ring_size;	/* current rx ring size */
	unsigned int		tx_ring_size;	/* current tx ring size */
	unsigned int		rx_mod_mask;	/* rx ring modular mask */
	unsigned int		tx_mod_mask;	/* tx ring modular mask */
	unsigned short		rx_len_bits;
	unsigned short		tx_len_bits;
	dma_addr_t		rx_ring_dma_addr;
	dma_addr_t		tx_ring_dma_addr;
	unsigned int		dirty_rx,	/* ring entries to be freed. */
				dirty_tx;

	struct net_device_stats	stats;
	char			tx_full;
	char			phycount;	/* number of phys found */
	int			options;
	unsigned int		shared_irq:1,	/* shared irq possible */
				dxsuflo:1,   /* disable transmit stop on uflo */
				mii:1;		/* mii port available */
	struct net_device	*next;
	struct mii_if_info	mii_if;
	struct timer_list	watchdog_timer;
	struct timer_list	blink_timer;
	u32			msg_enable;	/* debug message level */

	/* each bit indicates an available PHY */
	u32			phymask;
};

static int pcnet32_probe_pci(struct pci_dev *, const struct pci_device_id *);
static int pcnet32_probe1(unsigned long, int, struct pci_dev *);
static int pcnet32_open(struct net_device *);
static int pcnet32_init_ring(struct net_device *);
static int pcnet32_start_xmit(struct sk_buff *, struct net_device *);
static int pcnet32_rx(struct net_device *);
static void pcnet32_tx_timeout(struct net_device *dev);
static irqreturn_t pcnet32_interrupt(int, void *, struct pt_regs *);
static int pcnet32_close(struct net_device *);
static struct net_device_stats *pcnet32_get_stats(struct net_device *);
static void pcnet32_load_multicast(struct net_device *dev);
static void pcnet32_set_multicast_list(struct net_device *);
static int pcnet32_ioctl(struct net_device *, struct ifreq *, int);
static void pcnet32_watchdog(struct net_device *);
static int mdio_read(struct net_device *dev, int phy_id, int reg_num);
static void mdio_write(struct net_device *dev, int phy_id, int reg_num,
		       int val);
static void pcnet32_restart(struct net_device *dev, unsigned int csr0_bits);
static void pcnet32_ethtool_test(struct net_device *dev,
				 struct ethtool_test *eth_test, u64 * data);
static int pcnet32_loopback_test(struct net_device *dev, uint64_t * data1);
static int pcnet32_phys_id(struct net_device *dev, u32 data);
static void pcnet32_led_blink_callback(struct net_device *dev);
static int pcnet32_get_regs_len(struct net_device *dev);
static void pcnet32_get_regs(struct net_device *dev, struct ethtool_regs *regs,
			     void *ptr);
static void pcnet32_purge_tx_ring(struct net_device *dev);
static int pcnet32_alloc_ring(struct net_device *dev, char *name);
static void pcnet32_free_ring(struct net_device *dev);
static void pcnet32_check_media(struct net_device *dev, int verbose);

static u16 pcnet32_wio_read_csr(unsigned long addr, int index)
{
	outw(index, addr + PCNET32_WIO_RAP);
	return inw(addr + PCNET32_WIO_RDP);
}

static void pcnet32_wio_write_csr(unsigned long addr, int index, u16 val)
{
	outw(index, addr + PCNET32_WIO_RAP);
	outw(val, addr + PCNET32_WIO_RDP);
}

static u16 pcnet32_wio_read_bcr(unsigned long addr, int index)
{
	outw(index, addr + PCNET32_WIO_RAP);
	return inw(addr + PCNET32_WIO_BDP);
}

static void pcnet32_wio_write_bcr(unsigned long addr, int index, u16 val)
{
	outw(index, addr + PCNET32_WIO_RAP);
	outw(val, addr + PCNET32_WIO_BDP);
}

static u16 pcnet32_wio_read_rap(unsigned long addr)
{
	return inw(addr + PCNET32_WIO_RAP);
}

static void pcnet32_wio_write_rap(unsigned long addr, u16 val)
{
	outw(val, addr + PCNET32_WIO_RAP);
}

static void pcnet32_wio_reset(unsigned long addr)
{
	inw(addr + PCNET32_WIO_RESET);
}

static int pcnet32_wio_check(unsigned long addr)
{
	outw(88, addr + PCNET32_WIO_RAP);
	return (inw(addr + PCNET32_WIO_RAP) == 88);
}

static struct pcnet32_access pcnet32_wio = {
	.read_csr = pcnet32_wio_read_csr,
	.write_csr = pcnet32_wio_write_csr,
	.read_bcr = pcnet32_wio_read_bcr,
	.write_bcr = pcnet32_wio_write_bcr,
	.read_rap = pcnet32_wio_read_rap,
	.write_rap = pcnet32_wio_write_rap,
	.reset = pcnet32_wio_reset
};

static u16 pcnet32_dwio_read_csr(unsigned long addr, int index)
{
	outl(index, addr + PCNET32_DWIO_RAP);
	return (inl(addr + PCNET32_DWIO_RDP) & 0xffff);
}

static void pcnet32_dwio_write_csr(unsigned long addr, int index, u16 val)
{
	outl(index, addr + PCNET32_DWIO_RAP);
	outl(val, addr + PCNET32_DWIO_RDP);
}

static u16 pcnet32_dwio_read_bcr(unsigned long addr, int index)
{
	outl(index, addr + PCNET32_DWIO_RAP);
	return (inl(addr + PCNET32_DWIO_BDP) & 0xffff);
}

static void pcnet32_dwio_write_bcr(unsigned long addr, int index, u16 val)
{
	outl(index, addr + PCNET32_DWIO_RAP);
	outl(val, addr + PCNET32_DWIO_BDP);
}

static u16 pcnet32_dwio_read_rap(unsigned long addr)
{
	return (inl(addr + PCNET32_DWIO_RAP) & 0xffff);
}

static void pcnet32_dwio_write_rap(unsigned long addr, u16 val)
{
	outl(val, addr + PCNET32_DWIO_RAP);
}

static void pcnet32_dwio_reset(unsigned long addr)
{
	inl(addr + PCNET32_DWIO_RESET);
}

static int pcnet32_dwio_check(unsigned long addr)
{
	outl(88, addr + PCNET32_DWIO_RAP);
	return ((inl(addr + PCNET32_DWIO_RAP) & 0xffff) == 88);
}

static struct pcnet32_access pcnet32_dwio = {
	.read_csr = pcnet32_dwio_read_csr,
	.write_csr = pcnet32_dwio_write_csr,
	.read_bcr = pcnet32_dwio_read_bcr,
	.write_bcr = pcnet32_dwio_write_bcr,
	.read_rap = pcnet32_dwio_read_rap,
	.write_rap = pcnet32_dwio_write_rap,
	.reset = pcnet32_dwio_reset
};

#ifdef CONFIG_NET_POLL_CONTROLLER
static void pcnet32_poll_controller(struct net_device *dev)
{
	disable_irq(dev->irq);
	pcnet32_interrupt(0, dev, NULL);
	enable_irq(dev->irq);
}
#endif

static int pcnet32_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long flags;
	int r = -EOPNOTSUPP;

	if (lp->mii) {
		spin_lock_irqsave(&lp->lock, flags);
		mii_ethtool_gset(&lp->mii_if, cmd);
		spin_unlock_irqrestore(&lp->lock, flags);
		r = 0;
	}
	return r;
}

static int pcnet32_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long flags;
	int r = -EOPNOTSUPP;

	if (lp->mii) {
		spin_lock_irqsave(&lp->lock, flags);
		r = mii_ethtool_sset(&lp->mii_if, cmd);
		spin_unlock_irqrestore(&lp->lock, flags);
	}
	return r;
}

static void pcnet32_get_drvinfo(struct net_device *dev,
				struct ethtool_drvinfo *info)
{
	struct pcnet32_private *lp = dev->priv;

	strcpy(info->driver, DRV_NAME);
	strcpy(info->version, DRV_VERSION);
	if (lp->pci_dev)
		strcpy(info->bus_info, pci_name(lp->pci_dev));
	else
		sprintf(info->bus_info, "VLB 0x%lx", dev->base_addr);
}

static u32 pcnet32_get_link(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long flags;
	int r;

	spin_lock_irqsave(&lp->lock, flags);
	if (lp->mii) {
		r = mii_link_ok(&lp->mii_if);
	} else {
		ulong ioaddr = dev->base_addr;	/* card base I/O address */
		r = (lp->a.read_bcr(ioaddr, 4) != 0xc0);
	}
	spin_unlock_irqrestore(&lp->lock, flags);

	return r;
}

static u32 pcnet32_get_msglevel(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	return lp->msg_enable;
}

static void pcnet32_set_msglevel(struct net_device *dev, u32 value)
{
	struct pcnet32_private *lp = dev->priv;
	lp->msg_enable = value;
}

static int pcnet32_nway_reset(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long flags;
	int r = -EOPNOTSUPP;

	if (lp->mii) {
		spin_lock_irqsave(&lp->lock, flags);
		r = mii_nway_restart(&lp->mii_if);
		spin_unlock_irqrestore(&lp->lock, flags);
	}
	return r;
}

static void pcnet32_get_ringparam(struct net_device *dev,
				  struct ethtool_ringparam *ering)
{
	struct pcnet32_private *lp = dev->priv;

	ering->tx_max_pending = TX_MAX_RING_SIZE - 1;
	ering->tx_pending = lp->tx_ring_size - 1;
	ering->rx_max_pending = RX_MAX_RING_SIZE - 1;
	ering->rx_pending = lp->rx_ring_size - 1;
}

static int pcnet32_set_ringparam(struct net_device *dev,
				 struct ethtool_ringparam *ering)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long flags;
	int i;

	if (ering->rx_mini_pending || ering->rx_jumbo_pending)
		return -EINVAL;

	if (netif_running(dev))
		pcnet32_close(dev);

	spin_lock_irqsave(&lp->lock, flags);
	pcnet32_free_ring(dev);
	lp->tx_ring_size =
	    min(ering->tx_pending, (unsigned int)TX_MAX_RING_SIZE);
	lp->rx_ring_size =
	    min(ering->rx_pending, (unsigned int)RX_MAX_RING_SIZE);

	/* set the minimum ring size to 4, to allow the loopback test to work
	 * unchanged.
	 */
	for (i = 2; i <= PCNET32_LOG_MAX_TX_BUFFERS; i++) {
		if (lp->tx_ring_size <= (1 << i))
			break;
	}
	lp->tx_ring_size = (1 << i);
	lp->tx_mod_mask = lp->tx_ring_size - 1;
	lp->tx_len_bits = (i << 12);

	for (i = 2; i <= PCNET32_LOG_MAX_RX_BUFFERS; i++) {
		if (lp->rx_ring_size <= (1 << i))
			break;
	}
	lp->rx_ring_size = (1 << i);
	lp->rx_mod_mask = lp->rx_ring_size - 1;
	lp->rx_len_bits = (i << 4);

	if (pcnet32_alloc_ring(dev, dev->name)) {
		pcnet32_free_ring(dev);
		spin_unlock_irqrestore(&lp->lock, flags);
		return -ENOMEM;
	}

	spin_unlock_irqrestore(&lp->lock, flags);

	if (pcnet32_debug & NETIF_MSG_DRV)
		printk(KERN_INFO PFX
		       "%s: Ring Param Settings: RX: %d, TX: %d\n", dev->name,
		       lp->rx_ring_size, lp->tx_ring_size);

	if (netif_running(dev))
		pcnet32_open(dev);

	return 0;
}

static void pcnet32_get_strings(struct net_device *dev, u32 stringset,
				u8 * data)
{
	memcpy(data, pcnet32_gstrings_test, sizeof(pcnet32_gstrings_test));
}

static int pcnet32_self_test_count(struct net_device *dev)
{
	return PCNET32_TEST_LEN;
}

static void pcnet32_ethtool_test(struct net_device *dev,
				 struct ethtool_test *test, u64 * data)
{
	struct pcnet32_private *lp = dev->priv;
	int rc;

	if (test->flags == ETH_TEST_FL_OFFLINE) {
		rc = pcnet32_loopback_test(dev, data);
		if (rc) {
			if (netif_msg_hw(lp))
				printk(KERN_DEBUG "%s: Loopback test failed.\n",
				       dev->name);
			test->flags |= ETH_TEST_FL_FAILED;
		} else if (netif_msg_hw(lp))
			printk(KERN_DEBUG "%s: Loopback test passed.\n",
			       dev->name);
	} else if (netif_msg_hw(lp))
		printk(KERN_DEBUG
		       "%s: No tests to run (specify 'Offline' on ethtool).",
		       dev->name);
}				/* end pcnet32_ethtool_test */

static int pcnet32_loopback_test(struct net_device *dev, uint64_t * data1)
{
	struct pcnet32_private *lp = dev->priv;
	struct pcnet32_access *a = &lp->a;	/* access to registers */
	ulong ioaddr = dev->base_addr;	/* card base I/O address */
	struct sk_buff *skb;	/* sk buff */
	int x, i;		/* counters */
	int numbuffs = 4;	/* number of TX/RX buffers and descs */
	u16 status = 0x8300;	/* TX ring status */
	u16 teststatus;		/* test of ring status */
	int rc;			/* return code */
	int size;		/* size of packets */
	unsigned char *packet;	/* source packet data */
	static const int data_len = 60;	/* length of source packets */
	unsigned long flags;
	unsigned long ticks;

	*data1 = 1;		/* status of test, default to fail */
	rc = 1;			/* default to fail */

	if (netif_running(dev))
		pcnet32_close(dev);

	spin_lock_irqsave(&lp->lock, flags);

	/* Reset the PCNET32 */
	lp->a.reset(ioaddr);

	/* switch pcnet32 to 32bit mode */
	lp->a.write_bcr(ioaddr, 20, 2);

	lp->init_block.mode =
	    le16_to_cpu((lp->options & PCNET32_PORT_PORTSEL) << 7);
	lp->init_block.filter[0] = 0;
	lp->init_block.filter[1] = 0;

	/* purge & init rings but don't actually restart */
	pcnet32_restart(dev, 0x0000);

	lp->a.write_csr(ioaddr, 0, 0x0004);	/* Set STOP bit */

	/* Initialize Transmit buffers. */
	size = data_len + 15;
	for (x = 0; x < numbuffs; x++) {
		if (!(skb = dev_alloc_skb(size))) {
			if (netif_msg_hw(lp))
				printk(KERN_DEBUG
				       "%s: Cannot allocate skb at line: %d!\n",
				       dev->name, __LINE__);
			goto clean_up;
		} else {
			packet = skb->data;
			skb_put(skb, size);	/* create space for data */
			lp->tx_skbuff[x] = skb;
			lp->tx_ring[x].length = le16_to_cpu(-skb->len);
			lp->tx_ring[x].misc = 0;

			/* put DA and SA into the skb */
			for (i = 0; i < 6; i++)
				*packet++ = dev->dev_addr[i];
			for (i = 0; i < 6; i++)
				*packet++ = dev->dev_addr[i];
			/* type */
			*packet++ = 0x08;
			*packet++ = 0x06;
			/* packet number */
			*packet++ = x;
			/* fill packet with data */
			for (i = 0; i < data_len; i++)
				*packet++ = i;

			lp->tx_dma_addr[x] =
			    pci_map_single(lp->pci_dev, skb->data, skb->len,
					   PCI_DMA_TODEVICE);
			lp->tx_ring[x].base =
			    (u32) le32_to_cpu(lp->tx_dma_addr[x]);
			wmb();	/* Make sure owner changes after all others are visible */
			lp->tx_ring[x].status = le16_to_cpu(status);
		}
	}

	x = a->read_bcr(ioaddr, 32);	/* set internal loopback in BSR32 */
	x = x | 0x0002;
	a->write_bcr(ioaddr, 32, x);

	lp->a.write_csr(ioaddr, 15, 0x0044);	/* set int loopback in CSR15 */

	teststatus = le16_to_cpu(0x8000);
	lp->a.write_csr(ioaddr, 0, 0x0002);	/* Set STRT bit */

	/* Check status of descriptors */
	for (x = 0; x < numbuffs; x++) {
		ticks = 0;
		rmb();
		while ((lp->rx_ring[x].status & teststatus) && (ticks < 200)) {
			spin_unlock_irqrestore(&lp->lock, flags);
			mdelay(1);
			spin_lock_irqsave(&lp->lock, flags);
			rmb();
			ticks++;
		}
		if (ticks == 200) {
			if (netif_msg_hw(lp))
				printk("%s: Desc %d failed to reset!\n",
				       dev->name, x);
			break;
		}
	}

	lp->a.write_csr(ioaddr, 0, 0x0004);	/* Set STOP bit */
	wmb();
	if (netif_msg_hw(lp) && netif_msg_pktdata(lp)) {
		printk(KERN_DEBUG "%s: RX loopback packets:\n", dev->name);

		for (x = 0; x < numbuffs; x++) {
			printk(KERN_DEBUG "%s: Packet %d:\n", dev->name, x);
			skb = lp->rx_skbuff[x];
			for (i = 0; i < size; i++) {
				printk("%02x ", *(skb->data + i));
			}
			printk("\n");
		}
	}

	x = 0;
	rc = 0;
	while (x < numbuffs && !rc) {
		skb = lp->rx_skbuff[x];
		packet = lp->tx_skbuff[x]->data;
		for (i = 0; i < size; i++) {
			if (*(skb->data + i) != packet[i]) {
				if (netif_msg_hw(lp))
					printk(KERN_DEBUG
					       "%s: Error in compare! %2x - %02x %02x\n",
					       dev->name, i, *(skb->data + i),
					       packet[i]);
				rc = 1;
				break;
			}
		}
		x++;
	}
	if (!rc) {
		*data1 = 0;
	}

      clean_up:
	pcnet32_purge_tx_ring(dev);
	x = a->read_csr(ioaddr, 15) & 0xFFFF;
	a->write_csr(ioaddr, 15, (x & ~0x0044));	/* reset bits 6 and 2 */

	x = a->read_bcr(ioaddr, 32);	/* reset internal loopback */
	x = x & ~0x0002;
	a->write_bcr(ioaddr, 32, x);

	spin_unlock_irqrestore(&lp->lock, flags);

	if (netif_running(dev)) {
		pcnet32_open(dev);
	} else {
		lp->a.write_bcr(ioaddr, 20, 4);	/* return to 16bit mode */
	}

	return (rc);
}				/* end pcnet32_loopback_test  */

static void pcnet32_led_blink_callback(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	struct pcnet32_access *a = &lp->a;
	ulong ioaddr = dev->base_addr;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&lp->lock, flags);
	for (i = 4; i < 8; i++) {
		a->write_bcr(ioaddr, i, a->read_bcr(ioaddr, i) ^ 0x4000);
	}
	spin_unlock_irqrestore(&lp->lock, flags);

	mod_timer(&lp->blink_timer, PCNET32_BLINK_TIMEOUT);
}

static int pcnet32_phys_id(struct net_device *dev, u32 data)
{
	struct pcnet32_private *lp = dev->priv;
	struct pcnet32_access *a = &lp->a;
	ulong ioaddr = dev->base_addr;
	unsigned long flags;
	int i, regs[4];

	if (!lp->blink_timer.function) {
		init_timer(&lp->blink_timer);
		lp->blink_timer.function = (void *)pcnet32_led_blink_callback;
		lp->blink_timer.data = (unsigned long)dev;
	}

	/* Save the current value of the bcrs */
	spin_lock_irqsave(&lp->lock, flags);
	for (i = 4; i < 8; i++) {
		regs[i - 4] = a->read_bcr(ioaddr, i);
	}
	spin_unlock_irqrestore(&lp->lock, flags);

	mod_timer(&lp->blink_timer, jiffies);
	set_current_state(TASK_INTERRUPTIBLE);

	if ((!data) || (data > (u32) (MAX_SCHEDULE_TIMEOUT / HZ)))
		data = (u32) (MAX_SCHEDULE_TIMEOUT / HZ);

	msleep_interruptible(data * 1000);
	del_timer_sync(&lp->blink_timer);

	/* Restore the original value of the bcrs */
	spin_lock_irqsave(&lp->lock, flags);
	for (i = 4; i < 8; i++) {
		a->write_bcr(ioaddr, i, regs[i - 4]);
	}
	spin_unlock_irqrestore(&lp->lock, flags);

	return 0;
}

#define PCNET32_REGS_PER_PHY	32
#define PCNET32_MAX_PHYS	32
static int pcnet32_get_regs_len(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	int j = lp->phycount * PCNET32_REGS_PER_PHY;

	return ((PCNET32_NUM_REGS + j) * sizeof(u16));
}

static void pcnet32_get_regs(struct net_device *dev, struct ethtool_regs *regs,
			     void *ptr)
{
	int i, csr0;
	u16 *buff = ptr;
	struct pcnet32_private *lp = dev->priv;
	struct pcnet32_access *a = &lp->a;
	ulong ioaddr = dev->base_addr;
	int ticks;
	unsigned long flags;

	spin_lock_irqsave(&lp->lock, flags);

	csr0 = a->read_csr(ioaddr, 0);
	if (!(csr0 & 0x0004)) {	/* If not stopped */
		/* set SUSPEND (SPND) - CSR5 bit 0 */
		a->write_csr(ioaddr, 5, 0x0001);

		/* poll waiting for bit to be set */
		ticks = 0;
		while (!(a->read_csr(ioaddr, 5) & 0x0001)) {
			spin_unlock_irqrestore(&lp->lock, flags);
			mdelay(1);
			spin_lock_irqsave(&lp->lock, flags);
			ticks++;
			if (ticks > 200) {
				if (netif_msg_hw(lp))
					printk(KERN_DEBUG
					       "%s: Error getting into suspend!\n",
					       dev->name);
				break;
			}
		}
	}

	/* read address PROM */
	for (i = 0; i < 16; i += 2)
		*buff++ = inw(ioaddr + i);

	/* read control and status registers */
	for (i = 0; i < 90; i++) {
		*buff++ = a->read_csr(ioaddr, i);
	}

	*buff++ = a->read_csr(ioaddr, 112);
	*buff++ = a->read_csr(ioaddr, 114);

	/* read bus configuration registers */
	for (i = 0; i < 30; i++) {
		*buff++ = a->read_bcr(ioaddr, i);
	}
	*buff++ = 0;		/* skip bcr30 so as not to hang 79C976 */
	for (i = 31; i < 36; i++) {
		*buff++ = a->read_bcr(ioaddr, i);
	}

	/* read mii phy registers */
	if (lp->mii) {
		int j;
		for (j = 0; j < PCNET32_MAX_PHYS; j++) {
			if (lp->phymask & (1 << j)) {
				for (i = 0; i < PCNET32_REGS_PER_PHY; i++) {
					lp->a.write_bcr(ioaddr, 33,
							(j << 5) | i);
					*buff++ = lp->a.read_bcr(ioaddr, 34);
				}
			}
		}
	}

	if (!(csr0 & 0x0004)) {	/* If not stopped */
		/* clear SUSPEND (SPND) - CSR5 bit 0 */
		a->write_csr(ioaddr, 5, 0x0000);
	}

	spin_unlock_irqrestore(&lp->lock, flags);
}

static struct ethtool_ops pcnet32_ethtool_ops = {
	.get_settings		= pcnet32_get_settings,
	.set_settings		= pcnet32_set_settings,
	.get_drvinfo		= pcnet32_get_drvinfo,
	.get_msglevel		= pcnet32_get_msglevel,
	.set_msglevel		= pcnet32_set_msglevel,
	.nway_reset		= pcnet32_nway_reset,
	.get_link		= pcnet32_get_link,
	.get_ringparam		= pcnet32_get_ringparam,
	.set_ringparam		= pcnet32_set_ringparam,
	.get_tx_csum		= ethtool_op_get_tx_csum,
	.get_sg			= ethtool_op_get_sg,
	.get_tso		= ethtool_op_get_tso,
	.get_strings		= pcnet32_get_strings,
	.self_test_count	= pcnet32_self_test_count,
	.self_test		= pcnet32_ethtool_test,
	.phys_id		= pcnet32_phys_id,
	.get_regs_len		= pcnet32_get_regs_len,
	.get_regs		= pcnet32_get_regs,
	.get_perm_addr		= ethtool_op_get_perm_addr,
};

/* only probes for non-PCI devices, the rest are handled by
 * pci_register_driver via pcnet32_probe_pci */

static void __devinit pcnet32_probe_vlbus(unsigned int *pcnet32_portlist)
{
	unsigned int *port, ioaddr;

	/* search for PCnet32 VLB cards at known addresses */
	for (port = pcnet32_portlist; (ioaddr = *port); port++) {
		if (request_region
		    (ioaddr, PCNET32_TOTAL_SIZE, "pcnet32_probe_vlbus")) {
			/* check if there is really a pcnet chip on that ioaddr */
			if ((inb(ioaddr + 14) == 0x57)
			    && (inb(ioaddr + 15) == 0x57)) {
				pcnet32_probe1(ioaddr, 0, NULL);
			} else {
				release_region(ioaddr, PCNET32_TOTAL_SIZE);
			}
		}
	}
}

static int __devinit
pcnet32_probe_pci(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	unsigned long ioaddr;
	int err;

	err = pci_enable_device(pdev);
	if (err < 0) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_ERR PFX
			       "failed to enable device -- err=%d\n", err);
		return err;
	}
	pci_set_master(pdev);

	ioaddr = pci_resource_start(pdev, 0);
	if (!ioaddr) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_ERR PFX
			       "card has no PCI IO resources, aborting\n");
		return -ENODEV;
	}

	if (!pci_dma_supported(pdev, PCNET32_DMA_MASK)) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_ERR PFX
			       "architecture does not support 32bit PCI busmaster DMA\n");
		return -ENODEV;
	}
	if (request_region(ioaddr, PCNET32_TOTAL_SIZE, "pcnet32_probe_pci") ==
	    NULL) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_ERR PFX
			       "io address range already allocated\n");
		return -EBUSY;
	}

	err = pcnet32_probe1(ioaddr, 1, pdev);
	if (err < 0) {
		pci_disable_device(pdev);
	}
	return err;
}

/* pcnet32_probe1
 *  Called from both pcnet32_probe_vlbus and pcnet_probe_pci.
 *  pdev will be NULL when called from pcnet32_probe_vlbus.
 */
static int __devinit
pcnet32_probe1(unsigned long ioaddr, int shared, struct pci_dev *pdev)
{
	struct pcnet32_private *lp;
	dma_addr_t lp_dma_addr;
	int i, media;
	int fdx, mii, fset, dxsuflo;
	int chip_version;
	char *chipname;
	struct net_device *dev;
	struct pcnet32_access *a = NULL;
	u8 promaddr[6];
	int ret = -ENODEV;

	/* reset the chip */
	pcnet32_wio_reset(ioaddr);

	/* NOTE: 16-bit check is first, otherwise some older PCnet chips fail */
	if (pcnet32_wio_read_csr(ioaddr, 0) == 4 && pcnet32_wio_check(ioaddr)) {
		a = &pcnet32_wio;
	} else {
		pcnet32_dwio_reset(ioaddr);
		if (pcnet32_dwio_read_csr(ioaddr, 0) == 4
		    && pcnet32_dwio_check(ioaddr)) {
			a = &pcnet32_dwio;
		} else
			goto err_release_region;
	}

	chip_version =
	    a->read_csr(ioaddr, 88) | (a->read_csr(ioaddr, 89) << 16);
	if ((pcnet32_debug & NETIF_MSG_PROBE) && (pcnet32_debug & NETIF_MSG_HW))
		printk(KERN_INFO "  PCnet chip version is %#x.\n",
		       chip_version);
	if ((chip_version & 0xfff) != 0x003) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_INFO PFX "Unsupported chip version.\n");
		goto err_release_region;
	}

	/* initialize variables */
	fdx = mii = fset = dxsuflo = 0;
	chip_version = (chip_version >> 12) & 0xffff;

	switch (chip_version) {
	case 0x2420:
		chipname = "PCnet/PCI 79C970";	/* PCI */
		break;
	case 0x2430:
		if (shared)
			chipname = "PCnet/PCI 79C970";	/* 970 gives the wrong chip id back */
		else
			chipname = "PCnet/32 79C965";	/* 486/VL bus */
		break;
	case 0x2621:
		chipname = "PCnet/PCI II 79C970A";	/* PCI */
		fdx = 1;
		break;
	case 0x2623:
		chipname = "PCnet/FAST 79C971";	/* PCI */
		fdx = 1;
		mii = 1;
		fset = 1;
		break;
	case 0x2624:
		chipname = "PCnet/FAST+ 79C972";	/* PCI */
		fdx = 1;
		mii = 1;
		fset = 1;
		break;
	case 0x2625:
		chipname = "PCnet/FAST III 79C973";	/* PCI */
		fdx = 1;
		mii = 1;
		break;
	case 0x2626:
		chipname = "PCnet/Home 79C978";	/* PCI */
		fdx = 1;
		/*
		 * This is based on specs published at www.amd.com.  This section
		 * assumes that a card with a 79C978 wants to go into standard
		 * ethernet mode.  The 79C978 can also go into 1Mb HomePNA mode,
		 * and the module option homepna=1 can select this instead.
		 */
		media = a->read_bcr(ioaddr, 49);
		media &= ~3;	/* default to 10Mb ethernet */
		if (cards_found < MAX_UNITS && homepna[cards_found])
			media |= 1;	/* switch to home wiring mode */
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_DEBUG PFX "media set to %sMbit mode.\n",
			       (media & 1) ? "1" : "10");
		a->write_bcr(ioaddr, 49, media);
		break;
	case 0x2627:
		chipname = "PCnet/FAST III 79C975";	/* PCI */
		fdx = 1;
		mii = 1;
		break;
	case 0x2628:
		chipname = "PCnet/PRO 79C976";
		fdx = 1;
		mii = 1;
		break;
	default:
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_INFO PFX
			       "PCnet version %#x, no PCnet32 chip.\n",
			       chip_version);
		goto err_release_region;
	}

	/*
	 *  On selected chips turn on the BCR18:NOUFLO bit. This stops transmit
	 *  starting until the packet is loaded. Strike one for reliability, lose
	 *  one for latency - although on PCI this isnt a big loss. Older chips
	 *  have FIFO's smaller than a packet, so you can't do this.
	 *  Turn on BCR18:BurstRdEn and BCR18:BurstWrEn.
	 */

	if (fset) {
		a->write_bcr(ioaddr, 18, (a->read_bcr(ioaddr, 18) | 0x0860));
		a->write_csr(ioaddr, 80,
			     (a->read_csr(ioaddr, 80) & 0x0C00) | 0x0c00);
		dxsuflo = 1;
	}

	dev = alloc_etherdev(0);
	if (!dev) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_ERR PFX "Memory allocation failed.\n");
		ret = -ENOMEM;
		goto err_release_region;
	}
	SET_NETDEV_DEV(dev, &pdev->dev);

	if (pcnet32_debug & NETIF_MSG_PROBE)
		printk(KERN_INFO PFX "%s at %#3lx,", chipname, ioaddr);

	/* In most chips, after a chip reset, the ethernet address is read from the
	 * station address PROM at the base address and programmed into the
	 * "Physical Address Registers" CSR12-14.
	 * As a precautionary measure, we read the PROM values and complain if
	 * they disagree with the CSRs.  If they miscompare, and the PROM addr
	 * is valid, then the PROM addr is used.
	 */
	for (i = 0; i < 3; i++) {
		unsigned int val;
		val = a->read_csr(ioaddr, i + 12) & 0x0ffff;
		/* There may be endianness issues here. */
		dev->dev_addr[2 * i] = val & 0x0ff;
		dev->dev_addr[2 * i + 1] = (val >> 8) & 0x0ff;
	}

	/* read PROM address and compare with CSR address */
	for (i = 0; i < 6; i++)
		promaddr[i] = inb(ioaddr + i);

	if (memcmp(promaddr, dev->dev_addr, 6)
	    || !is_valid_ether_addr(dev->dev_addr)) {
		if (is_valid_ether_addr(promaddr)) {
			if (pcnet32_debug & NETIF_MSG_PROBE) {
				printk(" warning: CSR address invalid,\n");
				printk(KERN_INFO
				       "    using instead PROM address of");
			}
			memcpy(dev->dev_addr, promaddr, 6);
		}
	}
	memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);

	/* if the ethernet address is not valid, force to 00:00:00:00:00:00 */
	if (!is_valid_ether_addr(dev->perm_addr))
		memset(dev->dev_addr, 0, sizeof(dev->dev_addr));

	if (pcnet32_debug & NETIF_MSG_PROBE) {
		for (i = 0; i < 6; i++)
			printk(" %2.2x", dev->dev_addr[i]);

		/* Version 0x2623 and 0x2624 */
		if (((chip_version + 1) & 0xfffe) == 0x2624) {
			i = a->read_csr(ioaddr, 80) & 0x0C00;	/* Check tx_start_pt */
			printk("\n" KERN_INFO "    tx_start_pt(0x%04x):", i);
			switch (i >> 10) {
			case 0:
				printk("  20 bytes,");
				break;
			case 1:
				printk("  64 bytes,");
				break;
			case 2:
				printk(" 128 bytes,");
				break;
			case 3:
				printk("~220 bytes,");
				break;
			}
			i = a->read_bcr(ioaddr, 18);	/* Check Burst/Bus control */
			printk(" BCR18(%x):", i & 0xffff);
			if (i & (1 << 5))
				printk("BurstWrEn ");
			if (i & (1 << 6))
				printk("BurstRdEn ");
			if (i & (1 << 7))
				printk("DWordIO ");
			if (i & (1 << 11))
				printk("NoUFlow ");
			i = a->read_bcr(ioaddr, 25);
			printk("\n" KERN_INFO "    SRAMSIZE=0x%04x,", i << 8);
			i = a->read_bcr(ioaddr, 26);
			printk(" SRAM_BND=0x%04x,", i << 8);
			i = a->read_bcr(ioaddr, 27);
			if (i & (1 << 14))
				printk("LowLatRx");
		}
	}

	dev->base_addr = ioaddr;
	/* pci_alloc_consistent returns page-aligned memory, so we do not have to check the alignment */
	if ((lp =
	     pci_alloc_consistent(pdev, sizeof(*lp), &lp_dma_addr)) == NULL) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_ERR PFX
			       "Consistent memory allocation failed.\n");
		ret = -ENOMEM;
		goto err_free_netdev;
	}

	memset(lp, 0, sizeof(*lp));
	lp->dma_addr = lp_dma_addr;
	lp->pci_dev = pdev;

	spin_lock_init(&lp->lock);

	SET_MODULE_OWNER(dev);
	SET_NETDEV_DEV(dev, &pdev->dev);
	dev->priv = lp;
	lp->name = chipname;
	lp->shared_irq = shared;
	lp->tx_ring_size = TX_RING_SIZE;	/* default tx ring size */
	lp->rx_ring_size = RX_RING_SIZE;	/* default rx ring size */
	lp->tx_mod_mask = lp->tx_ring_size - 1;
	lp->rx_mod_mask = lp->rx_ring_size - 1;
	lp->tx_len_bits = (PCNET32_LOG_TX_BUFFERS << 12);
	lp->rx_len_bits = (PCNET32_LOG_RX_BUFFERS << 4);
	lp->mii_if.full_duplex = fdx;
	lp->mii_if.phy_id_mask = 0x1f;
	lp->mii_if.reg_num_mask = 0x1f;
	lp->dxsuflo = dxsuflo;
	lp->mii = mii;
	lp->msg_enable = pcnet32_debug;
	if ((cards_found >= MAX_UNITS)
	    || (options[cards_found] > sizeof(options_mapping)))
		lp->options = PCNET32_PORT_ASEL;
	else
		lp->options = options_mapping[options[cards_found]];
	lp->mii_if.dev = dev;
	lp->mii_if.mdio_read = mdio_read;
	lp->mii_if.mdio_write = mdio_write;

	if (fdx && !(lp->options & PCNET32_PORT_ASEL) &&
	    ((cards_found >= MAX_UNITS) || full_duplex[cards_found]))
		lp->options |= PCNET32_PORT_FD;

	if (!a) {
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(KERN_ERR PFX "No access methods\n");
		ret = -ENODEV;
		goto err_free_consistent;
	}
	lp->a = *a;

	/* prior to register_netdev, dev->name is not yet correct */
	if (pcnet32_alloc_ring(dev, pci_name(lp->pci_dev))) {
		ret = -ENOMEM;
		goto err_free_ring;
	}
	/* detect special T1/E1 WAN card by checking for MAC address */
	if (dev->dev_addr[0] == 0x00 && dev->dev_addr[1] == 0xe0
	    && dev->dev_addr[2] == 0x75)
		lp->options = PCNET32_PORT_FD | PCNET32_PORT_GPSI;

	lp->init_block.mode = le16_to_cpu(0x0003);	/* Disable Rx and Tx. */
	lp->init_block.tlen_rlen =
	    le16_to_cpu(lp->tx_len_bits | lp->rx_len_bits);
	for (i = 0; i < 6; i++)
		lp->init_block.phys_addr[i] = dev->dev_addr[i];
	lp->init_block.filter[0] = 0x00000000;
	lp->init_block.filter[1] = 0x00000000;
	lp->init_block.rx_ring = (u32) le32_to_cpu(lp->rx_ring_dma_addr);
	lp->init_block.tx_ring = (u32) le32_to_cpu(lp->tx_ring_dma_addr);

	/* switch pcnet32 to 32bit mode */
	a->write_bcr(ioaddr, 20, 2);

	a->write_csr(ioaddr, 1, (lp->dma_addr + offsetof(struct pcnet32_private,
							 init_block)) & 0xffff);
	a->write_csr(ioaddr, 2, (lp->dma_addr + offsetof(struct pcnet32_private,
							 init_block)) >> 16);

	if (pdev) {		/* use the IRQ provided by PCI */
		dev->irq = pdev->irq;
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(" assigned IRQ %d.\n", dev->irq);
	} else {
		unsigned long irq_mask = probe_irq_on();

		/*
		 * To auto-IRQ we enable the initialization-done and DMA error
		 * interrupts. For ISA boards we get a DMA error, but VLB and PCI
		 * boards will work.
		 */
		/* Trigger an initialization just for the interrupt. */
		a->write_csr(ioaddr, 0, 0x41);
		mdelay(1);

		dev->irq = probe_irq_off(irq_mask);
		if (!dev->irq) {
			if (pcnet32_debug & NETIF_MSG_PROBE)
				printk(", failed to detect IRQ line.\n");
			ret = -ENODEV;
			goto err_free_ring;
		}
		if (pcnet32_debug & NETIF_MSG_PROBE)
			printk(", probed IRQ %d.\n", dev->irq);
	}

	/* Set the mii phy_id so that we can query the link state */
	if (lp->mii) {
		/* lp->phycount and lp->phymask are set to 0 by memset above */

		lp->mii_if.phy_id = ((lp->a.read_bcr(ioaddr, 33)) >> 5) & 0x1f;
		/* scan for PHYs */
		for (i = 0; i < PCNET32_MAX_PHYS; i++) {
			unsigned short id1, id2;

			id1 = mdio_read(dev, i, MII_PHYSID1);
			if (id1 == 0xffff)
				continue;
			id2 = mdio_read(dev, i, MII_PHYSID2);
			if (id2 == 0xffff)
				continue;
			if (i == 31 && ((chip_version + 1) & 0xfffe) == 0x2624)
				continue;	/* 79C971 & 79C972 have phantom phy at id 31 */
			lp->phycount++;
			lp->phymask |= (1 << i);
			lp->mii_if.phy_id = i;
			if (pcnet32_debug & NETIF_MSG_PROBE)
				printk(KERN_INFO PFX
				       "Found PHY %04x:%04x at address %d.\n",
				       id1, id2, i);
		}
		lp->a.write_bcr(ioaddr, 33, (lp->mii_if.phy_id) << 5);
		if (lp->phycount > 1) {
			lp->options |= PCNET32_PORT_MII;
		}
	}

	init_timer(&lp->watchdog_timer);
	lp->watchdog_timer.data = (unsigned long)dev;
	lp->watchdog_timer.function = (void *)&pcnet32_watchdog;

	/* The PCNET32-specific entries in the device structure. */
	dev->open = &pcnet32_open;
	dev->hard_start_xmit = &pcnet32_start_xmit;
	dev->stop = &pcnet32_close;
	dev->get_stats = &pcnet32_get_stats;
	dev->set_multicast_list = &pcnet32_set_multicast_list;
	dev->do_ioctl = &pcnet32_ioctl;
	dev->ethtool_ops = &pcnet32_ethtool_ops;
	dev->tx_timeout = pcnet32_tx_timeout;
	dev->watchdog_timeo = (5 * HZ);

#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = pcnet32_poll_controller;
#endif

	/* Fill in the generic fields of the device structure. */
	if (register_netdev(dev))
		goto err_free_ring;

	if (pdev) {
		pci_set_drvdata(pdev, dev);
	} else {
		lp->next = pcnet32_dev;
		pcnet32_dev = dev;
	}

	if (pcnet32_debug & NETIF_MSG_PROBE)
		printk(KERN_INFO "%s: registered as %s\n", dev->name, lp->name);
	cards_found++;

	/* enable LED writes */
	a->write_bcr(ioaddr, 2, a->read_bcr(ioaddr, 2) | 0x1000);

	return 0;

      err_free_ring:
	pcnet32_free_ring(dev);
      err_free_consistent:
	pci_free_consistent(lp->pci_dev, sizeof(*lp), lp, lp->dma_addr);
      err_free_netdev:
	free_netdev(dev);
      err_release_region:
	release_region(ioaddr, PCNET32_TOTAL_SIZE);
	return ret;
}

/* if any allocation fails, caller must also call pcnet32_free_ring */
static int pcnet32_alloc_ring(struct net_device *dev, char *name)
{
	struct pcnet32_private *lp = dev->priv;

	lp->tx_ring = pci_alloc_consistent(lp->pci_dev,
					   sizeof(struct pcnet32_tx_head) *
					   lp->tx_ring_size,
					   &lp->tx_ring_dma_addr);
	if (lp->tx_ring == NULL) {
		if (pcnet32_debug & NETIF_MSG_DRV)
			printk("\n" KERN_ERR PFX
			       "%s: Consistent memory allocation failed.\n",
			       name);
		return -ENOMEM;
	}

	lp->rx_ring = pci_alloc_consistent(lp->pci_dev,
					   sizeof(struct pcnet32_rx_head) *
					   lp->rx_ring_size,
					   &lp->rx_ring_dma_addr);
	if (lp->rx_ring == NULL) {
		if (pcnet32_debug & NETIF_MSG_DRV)
			printk("\n" KERN_ERR PFX
			       "%s: Consistent memory allocation failed.\n",
			       name);
		return -ENOMEM;
	}

	lp->tx_dma_addr = kmalloc(sizeof(dma_addr_t) * lp->tx_ring_size,
				  GFP_ATOMIC);
	if (!lp->tx_dma_addr) {
		if (pcnet32_debug & NETIF_MSG_DRV)
			printk("\n" KERN_ERR PFX
			       "%s: Memory allocation failed.\n", name);
		return -ENOMEM;
	}
	memset(lp->tx_dma_addr, 0, sizeof(dma_addr_t) * lp->tx_ring_size);

	lp->rx_dma_addr = kmalloc(sizeof(dma_addr_t) * lp->rx_ring_size,
				  GFP_ATOMIC);
	if (!lp->rx_dma_addr) {
		if (pcnet32_debug & NETIF_MSG_DRV)
			printk("\n" KERN_ERR PFX
			       "%s: Memory allocation failed.\n", name);
		return -ENOMEM;
	}
	memset(lp->rx_dma_addr, 0, sizeof(dma_addr_t) * lp->rx_ring_size);

	lp->tx_skbuff = kmalloc(sizeof(struct sk_buff *) * lp->tx_ring_size,
				GFP_ATOMIC);
	if (!lp->tx_skbuff) {
		if (pcnet32_debug & NETIF_MSG_DRV)
			printk("\n" KERN_ERR PFX
			       "%s: Memory allocation failed.\n", name);
		return -ENOMEM;
	}
	memset(lp->tx_skbuff, 0, sizeof(struct sk_buff *) * lp->tx_ring_size);

	lp->rx_skbuff = kmalloc(sizeof(struct sk_buff *) * lp->rx_ring_size,
				GFP_ATOMIC);
	if (!lp->rx_skbuff) {
		if (pcnet32_debug & NETIF_MSG_DRV)
			printk("\n" KERN_ERR PFX
			       "%s: Memory allocation failed.\n", name);
		return -ENOMEM;
	}
	memset(lp->rx_skbuff, 0, sizeof(struct sk_buff *) * lp->rx_ring_size);

	return 0;
}

static void pcnet32_free_ring(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;

	kfree(lp->tx_skbuff);
	lp->tx_skbuff = NULL;

	kfree(lp->rx_skbuff);
	lp->rx_skbuff = NULL;

	kfree(lp->tx_dma_addr);
	lp->tx_dma_addr = NULL;

	kfree(lp->rx_dma_addr);
	lp->rx_dma_addr = NULL;

	if (lp->tx_ring) {
		pci_free_consistent(lp->pci_dev,
				    sizeof(struct pcnet32_tx_head) *
				    lp->tx_ring_size, lp->tx_ring,
				    lp->tx_ring_dma_addr);
		lp->tx_ring = NULL;
	}

	if (lp->rx_ring) {
		pci_free_consistent(lp->pci_dev,
				    sizeof(struct pcnet32_rx_head) *
				    lp->rx_ring_size, lp->rx_ring,
				    lp->rx_ring_dma_addr);
		lp->rx_ring = NULL;
	}
}

static int pcnet32_open(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long ioaddr = dev->base_addr;
	u16 val;
	int i;
	int rc;
	unsigned long flags;

	if (request_irq(dev->irq, &pcnet32_interrupt,
			lp->shared_irq ? IRQF_SHARED : 0, dev->name,
			(void *)dev)) {
		return -EAGAIN;
	}

	spin_lock_irqsave(&lp->lock, flags);
	/* Check for a valid station address */
	if (!is_valid_ether_addr(dev->dev_addr)) {
		rc = -EINVAL;
		goto err_free_irq;
	}

	/* Reset the PCNET32 */
	lp->a.reset(ioaddr);

	/* switch pcnet32 to 32bit mode */
	lp->a.write_bcr(ioaddr, 20, 2);

	if (netif_msg_ifup(lp))
		printk(KERN_DEBUG
		       "%s: pcnet32_open() irq %d tx/rx rings %#x/%#x init %#x.\n",
		       dev->name, dev->irq, (u32) (lp->tx_ring_dma_addr),
		       (u32) (lp->rx_ring_dma_addr),
		       (u32) (lp->dma_addr +
			      offsetof(struct pcnet32_private, init_block)));

	/* set/reset autoselect bit */
	val = lp->a.read_bcr(ioaddr, 2) & ~2;
	if (lp->options & PCNET32_PORT_ASEL)
		val |= 2;
	lp->a.write_bcr(ioaddr, 2, val);

	/* handle full duplex setting */
	if (lp->mii_if.full_duplex) {
		val = lp->a.read_bcr(ioaddr, 9) & ~3;
		if (lp->options & PCNET32_PORT_FD) {
			val |= 1;
			if (lp->options == (PCNET32_PORT_FD | PCNET32_PORT_AUI))
				val |= 2;
		} else if (lp->options & PCNET32_PORT_ASEL) {
			/* workaround of xSeries250, turn on for 79C975 only */
			i = ((lp->a.read_csr(ioaddr, 88) |
			      (lp->a.
			       read_csr(ioaddr, 89) << 16)) >> 12) & 0xffff;
			if (i == 0x2627)
				val |= 3;
		}
		lp->a.write_bcr(ioaddr, 9, val);
	}

	/* set/reset GPSI bit in test register */
	val = lp->a.read_csr(ioaddr, 124) & ~0x10;
	if ((lp->options & PCNET32_PORT_PORTSEL) == PCNET32_PORT_GPSI)
		val |= 0x10;
	lp->a.write_csr(ioaddr, 124, val);

	/* Allied Telesyn AT 2700/2701 FX are 100Mbit only and do not negotiate */
	if (lp->pci_dev->subsystem_vendor == PCI_VENDOR_ID_AT &&
	    (lp->pci_dev->subsystem_device == PCI_SUBDEVICE_ID_AT_2700FX ||
	     lp->pci_dev->subsystem_device == PCI_SUBDEVICE_ID_AT_2701FX)) {
		if (lp->options & PCNET32_PORT_ASEL) {
			lp->options = PCNET32_PORT_FD | PCNET32_PORT_100;
			if (netif_msg_link(lp))
				printk(KERN_DEBUG
				       "%s: Setting 100Mb-Full Duplex.\n",
				       dev->name);
		}
	}
	if (lp->phycount < 2) {
		/*
		 * 24 Jun 2004 according AMD, in order to change the PHY,
		 * DANAS (or DISPM for 79C976) must be set; then select the speed,
		 * duplex, and/or enable auto negotiation, and clear DANAS
		 */
		if (lp->mii && !(lp->options & PCNET32_PORT_ASEL)) {
			lp->a.write_bcr(ioaddr, 32,
					lp->a.read_bcr(ioaddr, 32) | 0x0080);
			/* disable Auto Negotiation, set 10Mpbs, HD */
			val = lp->a.read_bcr(ioaddr, 32) & ~0xb8;
			if (lp->options & PCNET32_PORT_FD)
				val |= 0x10;
			if (lp->options & PCNET32_PORT_100)
				val |= 0x08;
			lp->a.write_bcr(ioaddr, 32, val);
		} else {
			if (lp->options & PCNET32_PORT_ASEL) {
				lp->a.write_bcr(ioaddr, 32,
						lp->a.read_bcr(ioaddr,
							       32) | 0x0080);
				/* enable auto negotiate, setup, disable fd */
				val = lp->a.read_bcr(ioaddr, 32) & ~0x98;
				val |= 0x20;
				lp->a.write_bcr(ioaddr, 32, val);
			}
		}
	} else {
		int first_phy = -1;
		u16 bmcr;
		u32 bcr9;
		struct ethtool_cmd ecmd;

		/*
		 * There is really no good other way to handle multiple PHYs
		 * other than turning off all automatics
		 */
		val = lp->a.read_bcr(ioaddr, 2);
		lp->a.write_bcr(ioaddr, 2, val & ~2);
		val = lp->a.read_bcr(ioaddr, 32);
		lp->a.write_bcr(ioaddr, 32, val & ~(1 << 7));	/* stop MII manager */

		if (!(lp->options & PCNET32_PORT_ASEL)) {
			/* setup ecmd */
			ecmd.port = PORT_MII;
			ecmd.transceiver = XCVR_INTERNAL;
			ecmd.autoneg = AUTONEG_DISABLE;
			ecmd.speed =
			    lp->
			    options & PCNET32_PORT_100 ? SPEED_100 : SPEED_10;
			bcr9 = lp->a.read_bcr(ioaddr, 9);

			if (lp->options & PCNET32_PORT_FD) {
				ecmd.duplex = DUPLEX_FULL;
				bcr9 |= (1 << 0);
			} else {
				ecmd.duplex = DUPLEX_HALF;
				bcr9 |= ~(1 << 0);
			}
			lp->a.write_bcr(ioaddr, 9, bcr9);
		}

		for (i = 0; i < PCNET32_MAX_PHYS; i++) {
			if (lp->phymask & (1 << i)) {
				/* isolate all but the first PHY */
				bmcr = mdio_read(dev, i, MII_BMCR);
				if (first_phy == -1) {
					first_phy = i;
					mdio_write(dev, i, MII_BMCR,
						   bmcr & ~BMCR_ISOLATE);
				} else {
					mdio_write(dev, i, MII_BMCR,
						   bmcr | BMCR_ISOLATE);
				}
				/* use mii_ethtool_sset to setup PHY */
				lp->mii_if.phy_id = i;
				ecmd.phy_address = i;
				if (lp->options & PCNET32_PORT_ASEL) {
					mii_ethtool_gset(&lp->mii_if, &ecmd);
					ecmd.autoneg = AUTONEG_ENABLE;
				}
				mii_ethtool_sset(&lp->mii_if, &ecmd);
			}
		}
		lp->mii_if.phy_id = first_phy;
		if (netif_msg_link(lp))
			printk(KERN_INFO "%s: Using PHY number %d.\n",
			       dev->name, first_phy);
	}

#ifdef DO_DXSUFLO
	if (lp->dxsuflo) {	/* Disable transmit stop on underflow */
		val = lp->a.read_csr(ioaddr, 3);
		val |= 0x40;
		lp->a.write_csr(ioaddr, 3, val);
	}
#endif

	lp->init_block.mode =
	    le16_to_cpu((lp->options & PCNET32_PORT_PORTSEL) << 7);
	pcnet32_load_multicast(dev);

	if (pcnet32_init_ring(dev)) {
		rc = -ENOMEM;
		goto err_free_ring;
	}

	/* Re-initialize the PCNET32, and start it when done. */
	lp->a.write_csr(ioaddr, 1, (lp->dma_addr +
				    offsetof(struct pcnet32_private,
					     init_block)) & 0xffff);
	lp->a.write_csr(ioaddr, 2,
			(lp->dma_addr +
			 offsetof(struct pcnet32_private, init_block)) >> 16);

	lp->a.write_csr(ioaddr, 4, 0x0915);
	lp->a.write_csr(ioaddr, 0, 0x0001);

	netif_start_queue(dev);

	/* Print the link status and start the watchdog */
	pcnet32_check_media(dev, 1);
	mod_timer(&(lp->watchdog_timer), PCNET32_WATCHDOG_TIMEOUT);

	i = 0;
	while (i++ < 100)
		if (lp->a.read_csr(ioaddr, 0) & 0x0100)
			break;
	/*
	 * We used to clear the InitDone bit, 0x0100, here but Mark Stockton
	 * reports that doing so triggers a bug in the '974.
	 */
	lp->a.write_csr(ioaddr, 0, 0x0042);

	if (netif_msg_ifup(lp))
		printk(KERN_DEBUG
		       "%s: pcnet32 open after %d ticks, init block %#x csr0 %4.4x.\n",
		       dev->name, i,
		       (u32) (lp->dma_addr +
			      offsetof(struct pcnet32_private, init_block)),
		       lp->a.read_csr(ioaddr, 0));

	spin_unlock_irqrestore(&lp->lock, flags);

	return 0;		/* Always succeed */

      err_free_ring:
	/* free any allocated skbuffs */
	for (i = 0; i < lp->rx_ring_size; i++) {
		lp->rx_ring[i].status = 0;
		if (lp->rx_skbuff[i]) {
			pci_unmap_single(lp->pci_dev, lp->rx_dma_addr[i],
					 PKT_BUF_SZ - 2, PCI_DMA_FROMDEVICE);
			dev_kfree_skb(lp->rx_skbuff[i]);
		}
		lp->rx_skbuff[i] = NULL;
		lp->rx_dma_addr[i] = 0;
	}

	/*
	 * Switch back to 16bit mode to avoid problems with dumb
	 * DOS packet driver after a warm reboot
	 */
	lp->a.write_bcr(ioaddr, 20, 4);

      err_free_irq:
	spin_unlock_irqrestore(&lp->lock, flags);
	free_irq(dev->irq, dev);
	return rc;
}

/*
 * The LANCE has been halted for one reason or another (busmaster memory
 * arbitration error, Tx FIFO underflow, driver stopped it to reconfigure,
 * etc.).  Modern LANCE variants always reload their ring-buffer
 * configuration when restarted, so we must reinitialize our ring
 * context before restarting.  As part of this reinitialization,
 * find all packets still on the Tx ring and pretend that they had been
 * sent (in effect, drop the packets on the floor) - the higher-level
 * protocols will time out and retransmit.  It'd be better to shuffle
 * these skbs to a temp list and then actually re-Tx them after
 * restarting the chip, but I'm too lazy to do so right now.  dplatt@3do.com
 */

static void pcnet32_purge_tx_ring(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	int i;

	for (i = 0; i < lp->tx_ring_size; i++) {
		lp->tx_ring[i].status = 0;	/* CPU owns buffer */
		wmb();		/* Make sure adapter sees owner change */
		if (lp->tx_skbuff[i]) {
			pci_unmap_single(lp->pci_dev, lp->tx_dma_addr[i],
					 lp->tx_skbuff[i]->len,
					 PCI_DMA_TODEVICE);
			dev_kfree_skb_any(lp->tx_skbuff[i]);
		}
		lp->tx_skbuff[i] = NULL;
		lp->tx_dma_addr[i] = 0;
	}
}

/* Initialize the PCNET32 Rx and Tx rings. */
static int pcnet32_init_ring(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	int i;

	lp->tx_full = 0;
	lp->cur_rx = lp->cur_tx = 0;
	lp->dirty_rx = lp->dirty_tx = 0;

	for (i = 0; i < lp->rx_ring_size; i++) {
		struct sk_buff *rx_skbuff = lp->rx_skbuff[i];
		if (rx_skbuff == NULL) {
			if (!
			    (rx_skbuff = lp->rx_skbuff[i] =
			     dev_alloc_skb(PKT_BUF_SZ))) {
				/* there is not much, we can do at this point */
				if (pcnet32_debug & NETIF_MSG_DRV)
					printk(KERN_ERR
					       "%s: pcnet32_init_ring dev_alloc_skb failed.\n",
					       dev->name);
				return -1;
			}
			skb_reserve(rx_skbuff, 2);
		}

		rmb();
		if (lp->rx_dma_addr[i] == 0)
			lp->rx_dma_addr[i] =
			    pci_map_single(lp->pci_dev, rx_skbuff->data,
					   PKT_BUF_SZ - 2, PCI_DMA_FROMDEVICE);
		lp->rx_ring[i].base = (u32) le32_to_cpu(lp->rx_dma_addr[i]);
		lp->rx_ring[i].buf_length = le16_to_cpu(2 - PKT_BUF_SZ);
		wmb();		/* Make sure owner changes after all others are visible */
		lp->rx_ring[i].status = le16_to_cpu(0x8000);
	}
	/* The Tx buffer address is filled in as needed, but we do need to clear
	 * the upper ownership bit. */
	for (i = 0; i < lp->tx_ring_size; i++) {
		lp->tx_ring[i].status = 0;	/* CPU owns buffer */
		wmb();		/* Make sure adapter sees owner change */
		lp->tx_ring[i].base = 0;
		lp->tx_dma_addr[i] = 0;
	}

	lp->init_block.tlen_rlen =
	    le16_to_cpu(lp->tx_len_bits | lp->rx_len_bits);
	for (i = 0; i < 6; i++)
		lp->init_block.phys_addr[i] = dev->dev_addr[i];
	lp->init_block.rx_ring = (u32) le32_to_cpu(lp->rx_ring_dma_addr);
	lp->init_block.tx_ring = (u32) le32_to_cpu(lp->tx_ring_dma_addr);
	wmb();			/* Make sure all changes are visible */
	return 0;
}

/* the pcnet32 has been issued a stop or reset.  Wait for the stop bit
 * then flush the pending transmit operations, re-initialize the ring,
 * and tell the chip to initialize.
 */
static void pcnet32_restart(struct net_device *dev, unsigned int csr0_bits)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long ioaddr = dev->base_addr;
	int i;

	/* wait for stop */
	for (i = 0; i < 100; i++)
		if (lp->a.read_csr(ioaddr, 0) & 0x0004)
			break;

	if (i >= 100 && netif_msg_drv(lp))
		printk(KERN_ERR
		       "%s: pcnet32_restart timed out waiting for stop.\n",
		       dev->name);

	pcnet32_purge_tx_ring(dev);
	if (pcnet32_init_ring(dev))
		return;

	/* ReInit Ring */
	lp->a.write_csr(ioaddr, 0, 1);
	i = 0;
	while (i++ < 1000)
		if (lp->a.read_csr(ioaddr, 0) & 0x0100)
			break;

	lp->a.write_csr(ioaddr, 0, csr0_bits);
}

static void pcnet32_tx_timeout(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long ioaddr = dev->base_addr, flags;

	spin_lock_irqsave(&lp->lock, flags);
	/* Transmitter timeout, serious problems. */
	if (pcnet32_debug & NETIF_MSG_DRV)
		printk(KERN_ERR
		       "%s: transmit timed out, status %4.4x, resetting.\n",
		       dev->name, lp->a.read_csr(ioaddr, 0));
	lp->a.write_csr(ioaddr, 0, 0x0004);
	lp->stats.tx_errors++;
	if (netif_msg_tx_err(lp)) {
		int i;
		printk(KERN_DEBUG
		       " Ring data dump: dirty_tx %d cur_tx %d%s cur_rx %d.",
		       lp->dirty_tx, lp->cur_tx, lp->tx_full ? " (full)" : "",
		       lp->cur_rx);
		for (i = 0; i < lp->rx_ring_size; i++)
			printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ",
			       le32_to_cpu(lp->rx_ring[i].base),
			       (-le16_to_cpu(lp->rx_ring[i].buf_length)) &
			       0xffff, le32_to_cpu(lp->rx_ring[i].msg_length),
			       le16_to_cpu(lp->rx_ring[i].status));
		for (i = 0; i < lp->tx_ring_size; i++)
			printk("%s %08x %04x %08x %04x", i & 1 ? "" : "\n ",
			       le32_to_cpu(lp->tx_ring[i].base),
			       (-le16_to_cpu(lp->tx_ring[i].length)) & 0xffff,
			       le32_to_cpu(lp->tx_ring[i].misc),
			       le16_to_cpu(lp->tx_ring[i].status));
		printk("\n");
	}
	pcnet32_restart(dev, 0x0042);

	dev->trans_start = jiffies;
	netif_wake_queue(dev);

	spin_unlock_irqrestore(&lp->lock, flags);
}

static int pcnet32_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long ioaddr = dev->base_addr;
	u16 status;
	int entry;
	unsigned long flags;

	spin_lock_irqsave(&lp->lock, flags);

	if (netif_msg_tx_queued(lp)) {
		printk(KERN_DEBUG
		       "%s: pcnet32_start_xmit() called, csr0 %4.4x.\n",
		       dev->name, lp->a.read_csr(ioaddr, 0));
	}

	/* Default status -- will not enable Successful-TxDone
	 * interrupt when that option is available to us.
	 */
	status = 0x8300;

	/* Fill in a Tx ring entry */

	/* Mask to ring buffer boundary. */
	entry = lp->cur_tx & lp->tx_mod_mask;

	/* Caution: the write order is important here, set the status
	 * with the "ownership" bits last. */

	lp->tx_ring[entry].length = le16_to_cpu(-skb->len);

	lp->tx_ring[entry].misc = 0x00000000;

	lp->tx_skbuff[entry] = skb;
	lp->tx_dma_addr[entry] =
	    pci_map_single(lp->pci_dev, skb->data, skb->len, PCI_DMA_TODEVICE);
	lp->tx_ring[entry].base = (u32) le32_to_cpu(lp->tx_dma_addr[entry]);
	wmb();			/* Make sure owner changes after all others are visible */
	lp->tx_ring[entry].status = le16_to_cpu(status);

	lp->cur_tx++;
	lp->stats.tx_bytes += skb->len;

	/* Trigger an immediate send poll. */
	lp->a.write_csr(ioaddr, 0, 0x0048);

	dev->trans_start = jiffies;

	if (lp->tx_ring[(entry + 1) & lp->tx_mod_mask].base != 0) {
		lp->tx_full = 1;
		netif_stop_queue(dev);
	}
	spin_unlock_irqrestore(&lp->lock, flags);
	return 0;
}

/* The PCNET32 interrupt handler. */
static irqreturn_t
pcnet32_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
	struct net_device *dev = dev_id;
	struct pcnet32_private *lp;
	unsigned long ioaddr;
	u16 csr0, rap;
	int boguscnt = max_interrupt_work;
	int must_restart;

	if (!dev) {
		if (pcnet32_debug & NETIF_MSG_INTR)
			printk(KERN_DEBUG "%s(): irq %d for unknown device\n",
			       __FUNCTION__, irq);
		return IRQ_NONE;
	}

	ioaddr = dev->base_addr;
	lp = dev->priv;

	spin_lock(&lp->lock);

	rap = lp->a.read_rap(ioaddr);
	while ((csr0 = lp->a.read_csr(ioaddr, 0)) & 0x8f00 && --boguscnt >= 0) {
		if (csr0 == 0xffff) {
			break;	/* PCMCIA remove happened */
		}
		/* Acknowledge all of the current interrupt sources ASAP. */
		lp->a.write_csr(ioaddr, 0, csr0 & ~0x004f);

		must_restart = 0;

		if (netif_msg_intr(lp))
			printk(KERN_DEBUG
			       "%s: interrupt  csr0=%#2.2x new csr=%#2.2x.\n",
			       dev->name, csr0, lp->a.read_csr(ioaddr, 0));

		if (csr0 & 0x0400)	/* Rx interrupt */
			pcnet32_rx(dev);

		if (csr0 & 0x0200) {	/* Tx-done interrupt */
			unsigned int dirty_tx = lp->dirty_tx;
			int delta;

			while (dirty_tx != lp->cur_tx) {
				int entry = dirty_tx & lp->tx_mod_mask;
				int status =
				    (short)le16_to_cpu(lp->tx_ring[entry].
						       status);

				if (status < 0)
					break;	/* It still hasn't been Txed */

				lp->tx_ring[entry].base = 0;

				if (status & 0x4000) {
					/* There was an major error, log it. */
					int err_status =
					    le32_to_cpu(lp->tx_ring[entry].
							misc);
					lp->stats.tx_errors++;
					if (netif_msg_tx_err(lp))
						printk(KERN_ERR
						       "%s: Tx error status=%04x err_status=%08x\n",
						       dev->name, status,
						       err_status);
					if (err_status & 0x04000000)
						lp->stats.tx_aborted_errors++;
					if (err_status & 0x08000000)
						lp->stats.tx_carrier_errors++;
					if (err_status & 0x10000000)
						lp->stats.tx_window_errors++;
#ifndef DO_DXSUFLO
					if (err_status & 0x40000000) {
						lp->stats.tx_fifo_errors++;
						/* Ackk!  On FIFO errors the Tx unit is turned off! */
						/* Remove this verbosity later! */
						if (netif_msg_tx_err(lp))
							printk(KERN_ERR
							       "%s: Tx FIFO error! CSR0=%4.4x\n",
							       dev->name, csr0);
						must_restart = 1;
					}
#else
					if (err_status & 0x40000000) {
						lp->stats.tx_fifo_errors++;
						if (!lp->dxsuflo) {	/* If controller doesn't recover ... */
							/* Ackk!  On FIFO errors the Tx unit is turned off! */
							/* Remove this verbosity later! */
							if (netif_msg_tx_err
							    (lp))
								printk(KERN_ERR
								       "%s: Tx FIFO error! CSR0=%4.4x\n",
								       dev->
								       name,
								       csr0);
							must_restart = 1;
						}
					}
#endif
				} else {
					if (status & 0x1800)
						lp->stats.collisions++;
					lp->stats.tx_packets++;
				}

				/* We must free the original skb */
				if (lp->tx_skbuff[entry]) {
					pci_unmap_single(lp->pci_dev,
							 lp->tx_dma_addr[entry],
							 lp->tx_skbuff[entry]->
							 len, PCI_DMA_TODEVICE);
					dev_kfree_skb_irq(lp->tx_skbuff[entry]);
					lp->tx_skbuff[entry] = NULL;
					lp->tx_dma_addr[entry] = 0;
				}
				dirty_tx++;
			}

			delta =
			    (lp->cur_tx - dirty_tx) & (lp->tx_mod_mask +
						       lp->tx_ring_size);
			if (delta > lp->tx_ring_size) {
				if (netif_msg_drv(lp))
					printk(KERN_ERR
					       "%s: out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
					       dev->name, dirty_tx, lp->cur_tx,
					       lp->tx_full);
				dirty_tx += lp->tx_ring_size;
				delta -= lp->tx_ring_size;
			}

			if (lp->tx_full &&
			    netif_queue_stopped(dev) &&
			    delta < lp->tx_ring_size - 2) {
				/* The ring is no longer full, clear tbusy. */
				lp->tx_full = 0;
				netif_wake_queue(dev);
			}
			lp->dirty_tx = dirty_tx;
		}

		/* Log misc errors. */
		if (csr0 & 0x4000)
			lp->stats.tx_errors++;	/* Tx babble. */
		if (csr0 & 0x1000) {
			/*
			 * this happens when our receive ring is full. This shouldn't
			 * be a problem as we will see normal rx interrupts for the frames
			 * in the receive ring. But there are some PCI chipsets (I can
			 * reproduce this on SP3G with Intel saturn chipset) which have
			 * sometimes problems and will fill up the receive ring with
			 * error descriptors. In this situation we don't get a rx
			 * interrupt, but a missed frame interrupt sooner or later.
			 * So we try to clean up our receive ring here.
			 */
			pcnet32_rx(dev);
			lp->stats.rx_errors++;	/* Missed a Rx frame. */
		}
		if (csr0 & 0x0800) {
			if (netif_msg_drv(lp))
				printk(KERN_ERR
				       "%s: Bus master arbitration failure, status %4.4x.\n",
				       dev->name, csr0);
			/* unlike for the lance, there is no restart needed */
		}

		if (must_restart) {
			/* reset the chip to clear the error condition, then restart */
			lp->a.reset(ioaddr);
			lp->a.write_csr(ioaddr, 4, 0x0915);
			pcnet32_restart(dev, 0x0002);
			netif_wake_queue(dev);
		}
	}

	/* Set interrupt enable. */
	lp->a.write_csr(ioaddr, 0, 0x0040);
	lp->a.write_rap(ioaddr, rap);

	if (netif_msg_intr(lp))
		printk(KERN_DEBUG "%s: exiting interrupt, csr0=%#4.4x.\n",
		       dev->name, lp->a.read_csr(ioaddr, 0));

	spin_unlock(&lp->lock);

	return IRQ_HANDLED;
}

static int pcnet32_rx(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	int entry = lp->cur_rx & lp->rx_mod_mask;
	int boguscnt = lp->rx_ring_size / 2;

	/* If we own the next entry, it's a new packet. Send it up. */
	while ((short)le16_to_cpu(lp->rx_ring[entry].status) >= 0) {
		int status = (short)le16_to_cpu(lp->rx_ring[entry].status) >> 8;

		if (status != 0x03) {	/* There was an error. */
			/*
			 * There is a tricky error noted by John Murphy,
			 * <murf@perftech.com> to Russ Nelson: Even with full-sized
			 * buffers it's possible for a jabber packet to use two
			 * buffers, with only the last correctly noting the error.
			 */
			if (status & 0x01)	/* Only count a general error at the */
				lp->stats.rx_errors++;	/* end of a packet. */
			if (status & 0x20)
				lp->stats.rx_frame_errors++;
			if (status & 0x10)
				lp->stats.rx_over_errors++;
			if (status & 0x08)
				lp->stats.rx_crc_errors++;
			if (status & 0x04)
				lp->stats.rx_fifo_errors++;
			lp->rx_ring[entry].status &= le16_to_cpu(0x03ff);
		} else {
			/* Malloc up new buffer, compatible with net-2e. */
			short pkt_len =
			    (le32_to_cpu(lp->rx_ring[entry].msg_length) & 0xfff)
			    - 4;
			struct sk_buff *skb;

			/* Discard oversize frames. */
			if (unlikely(pkt_len > PKT_BUF_SZ - 2)) {
				if (netif_msg_drv(lp))
					printk(KERN_ERR
					       "%s: Impossible packet size %d!\n",
					       dev->name, pkt_len);
				lp->stats.rx_errors++;
			} else if (pkt_len < 60) {
				if (netif_msg_rx_err(lp))
					printk(KERN_ERR "%s: Runt packet!\n",
					       dev->name);
				lp->stats.rx_errors++;
			} else {
				int rx_in_place = 0;

				if (pkt_len > rx_copybreak) {
					struct sk_buff *newskb;

					if ((newskb =
					     dev_alloc_skb(PKT_BUF_SZ))) {
						skb_reserve(newskb, 2);
						skb = lp->rx_skbuff[entry];
						pci_unmap_single(lp->pci_dev,
								 lp->
								 rx_dma_addr
								 [entry],
								 PKT_BUF_SZ - 2,
								 PCI_DMA_FROMDEVICE);
						skb_put(skb, pkt_len);
						lp->rx_skbuff[entry] = newskb;
						newskb->dev = dev;
						lp->rx_dma_addr[entry] =
						    pci_map_single(lp->pci_dev,
								   newskb->data,
								   PKT_BUF_SZ -
								   2,
								   PCI_DMA_FROMDEVICE);
						lp->rx_ring[entry].base =
						    le32_to_cpu(lp->
								rx_dma_addr
								[entry]);
						rx_in_place = 1;
					} else
						skb = NULL;
				} else {
					skb = dev_alloc_skb(pkt_len + 2);
				}

				if (skb == NULL) {
					int i;
					if (netif_msg_drv(lp))
						printk(KERN_ERR
						       "%s: Memory squeeze, deferring packet.\n",
						       dev->name);
					for (i = 0; i < lp->rx_ring_size; i++)
						if ((short)
						    le16_to_cpu(lp->
								rx_ring[(entry +
									 i)
									& lp->
									rx_mod_mask].
								status) < 0)
							break;

					if (i > lp->rx_ring_size - 2) {
						lp->stats.rx_dropped++;
						lp->rx_ring[entry].status |=
						    le16_to_cpu(0x8000);
						wmb();	/* Make sure adapter sees owner change */
						lp->cur_rx++;
					}
					break;
				}
				skb->dev = dev;
				if (!rx_in_place) {
					skb_reserve(skb, 2);	/* 16 byte align */
					skb_put(skb, pkt_len);	/* Make room */
					pci_dma_sync_single_for_cpu(lp->pci_dev,
								    lp->
								    rx_dma_addr
								    [entry],
								    PKT_BUF_SZ -
								    2,
								    PCI_DMA_FROMDEVICE);
					eth_copy_and_sum(skb,
							 (unsigned char *)(lp->
									   rx_skbuff
									   [entry]->
									   data),
							 pkt_len, 0);
					pci_dma_sync_single_for_device(lp->
								       pci_dev,
								       lp->
								       rx_dma_addr
								       [entry],
								       PKT_BUF_SZ
								       - 2,
								       PCI_DMA_FROMDEVICE);
				}
				lp->stats.rx_bytes += skb->len;
				skb->protocol = eth_type_trans(skb, dev);
				netif_rx(skb);
				dev->last_rx = jiffies;
				lp->stats.rx_packets++;
			}
		}
		/*
		 * The docs say that the buffer length isn't touched, but Andrew Boyd
		 * of QNX reports that some revs of the 79C965 clear it.
		 */
		lp->rx_ring[entry].buf_length = le16_to_cpu(2 - PKT_BUF_SZ);
		wmb();		/* Make sure owner changes after all others are visible */
		lp->rx_ring[entry].status |= le16_to_cpu(0x8000);
		entry = (++lp->cur_rx) & lp->rx_mod_mask;
		if (--boguscnt <= 0)
			break;	/* don't stay in loop forever */
	}

	return 0;
}

static int pcnet32_close(struct net_device *dev)
{
	unsigned long ioaddr = dev->base_addr;
	struct pcnet32_private *lp = dev->priv;
	int i;
	unsigned long flags;

	del_timer_sync(&lp->watchdog_timer);

	netif_stop_queue(dev);

	spin_lock_irqsave(&lp->lock, flags);

	lp->stats.rx_missed_errors = lp->a.read_csr(ioaddr, 112);

	if (netif_msg_ifdown(lp))
		printk(KERN_DEBUG
		       "%s: Shutting down ethercard, status was %2.2x.\n",
		       dev->name, lp->a.read_csr(ioaddr, 0));

	/* We stop the PCNET32 here -- it occasionally polls memory if we don't. */
	lp->a.write_csr(ioaddr, 0, 0x0004);

	/*
	 * Switch back to 16bit mode to avoid problems with dumb
	 * DOS packet driver after a warm reboot
	 */
	lp->a.write_bcr(ioaddr, 20, 4);

	spin_unlock_irqrestore(&lp->lock, flags);

	free_irq(dev->irq, dev);

	spin_lock_irqsave(&lp->lock, flags);

	/* free all allocated skbuffs */
	for (i = 0; i < lp->rx_ring_size; i++) {
		lp->rx_ring[i].status = 0;
		wmb();		/* Make sure adapter sees owner change */
		if (lp->rx_skbuff[i]) {
			pci_unmap_single(lp->pci_dev, lp->rx_dma_addr[i],
					 PKT_BUF_SZ - 2, PCI_DMA_FROMDEVICE);
			dev_kfree_skb(lp->rx_skbuff[i]);
		}
		lp->rx_skbuff[i] = NULL;
		lp->rx_dma_addr[i] = 0;
	}

	for (i = 0; i < lp->tx_ring_size; i++) {
		lp->tx_ring[i].status = 0;	/* CPU owns buffer */
		wmb();		/* Make sure adapter sees owner change */
		if (lp->tx_skbuff[i]) {
			pci_unmap_single(lp->pci_dev, lp->tx_dma_addr[i],
					 lp->tx_skbuff[i]->len,
					 PCI_DMA_TODEVICE);
			dev_kfree_skb(lp->tx_skbuff[i]);
		}
		lp->tx_skbuff[i] = NULL;
		lp->tx_dma_addr[i] = 0;
	}

	spin_unlock_irqrestore(&lp->lock, flags);

	return 0;
}

static struct net_device_stats *pcnet32_get_stats(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long ioaddr = dev->base_addr;
	u16 saved_addr;
	unsigned long flags;

	spin_lock_irqsave(&lp->lock, flags);
	saved_addr = lp->a.read_rap(ioaddr);
	lp->stats.rx_missed_errors = lp->a.read_csr(ioaddr, 112);
	lp->a.write_rap(ioaddr, saved_addr);
	spin_unlock_irqrestore(&lp->lock, flags);

	return &lp->stats;
}

/* taken from the sunlance driver, which it took from the depca driver */
static void pcnet32_load_multicast(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	volatile struct pcnet32_init_block *ib = &lp->init_block;
	volatile u16 *mcast_table = (u16 *) & ib->filter;
	struct dev_mc_list *dmi = dev->mc_list;
	char *addrs;
	int i;
	u32 crc;

	/* set all multicast bits */
	if (dev->flags & IFF_ALLMULTI) {
		ib->filter[0] = 0xffffffff;
		ib->filter[1] = 0xffffffff;
		return;
	}
	/* clear the multicast filter */
	ib->filter[0] = 0;
	ib->filter[1] = 0;

	/* Add addresses */
	for (i = 0; i < dev->mc_count; i++) {
		addrs = dmi->dmi_addr;
		dmi = dmi->next;

		/* multicast address? */
		if (!(*addrs & 1))
			continue;

		crc = ether_crc_le(6, addrs);
		crc = crc >> 26;
		mcast_table[crc >> 4] =
		    le16_to_cpu(le16_to_cpu(mcast_table[crc >> 4]) |
				(1 << (crc & 0xf)));
	}
	return;
}

/*
 * Set or clear the multicast filter for this adaptor.
 */
static void pcnet32_set_multicast_list(struct net_device *dev)
{
	unsigned long ioaddr = dev->base_addr, flags;
	struct pcnet32_private *lp = dev->priv;

	spin_lock_irqsave(&lp->lock, flags);
	if (dev->flags & IFF_PROMISC) {
		/* Log any net taps. */
		if (netif_msg_hw(lp))
			printk(KERN_INFO "%s: Promiscuous mode enabled.\n",
			       dev->name);
		lp->init_block.mode =
		    le16_to_cpu(0x8000 | (lp->options & PCNET32_PORT_PORTSEL) <<
				7);
	} else {
		lp->init_block.mode =
		    le16_to_cpu((lp->options & PCNET32_PORT_PORTSEL) << 7);
		pcnet32_load_multicast(dev);
	}

	lp->a.write_csr(ioaddr, 0, 0x0004);	/* Temporarily stop the lance. */
	pcnet32_restart(dev, 0x0042);	/*  Resume normal operation */
	netif_wake_queue(dev);

	spin_unlock_irqrestore(&lp->lock, flags);
}

/* This routine assumes that the lp->lock is held */
static int mdio_read(struct net_device *dev, int phy_id, int reg_num)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long ioaddr = dev->base_addr;
	u16 val_out;

	if (!lp->mii)
		return 0;

	lp->a.write_bcr(ioaddr, 33, ((phy_id & 0x1f) << 5) | (reg_num & 0x1f));
	val_out = lp->a.read_bcr(ioaddr, 34);

	return val_out;
}

/* This routine assumes that the lp->lock is held */
static void mdio_write(struct net_device *dev, int phy_id, int reg_num, int val)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long ioaddr = dev->base_addr;

	if (!lp->mii)
		return;

	lp->a.write_bcr(ioaddr, 33, ((phy_id & 0x1f) << 5) | (reg_num & 0x1f));
	lp->a.write_bcr(ioaddr, 34, val);
}

static int pcnet32_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct pcnet32_private *lp = dev->priv;
	int rc;
	unsigned long flags;

	/* SIOC[GS]MIIxxx ioctls */
	if (lp->mii) {
		spin_lock_irqsave(&lp->lock, flags);
		rc = generic_mii_ioctl(&lp->mii_if, if_mii(rq), cmd, NULL);
		spin_unlock_irqrestore(&lp->lock, flags);
	} else {
		rc = -EOPNOTSUPP;
	}

	return rc;
}

static int pcnet32_check_otherphy(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	struct mii_if_info mii = lp->mii_if;
	u16 bmcr;
	int i;

	for (i = 0; i < PCNET32_MAX_PHYS; i++) {
		if (i == lp->mii_if.phy_id)
			continue;	/* skip active phy */
		if (lp->phymask & (1 << i)) {
			mii.phy_id = i;
			if (mii_link_ok(&mii)) {
				/* found PHY with active link */
				if (netif_msg_link(lp))
					printk(KERN_INFO
					       "%s: Using PHY number %d.\n",
					       dev->name, i);

				/* isolate inactive phy */
				bmcr =
				    mdio_read(dev, lp->mii_if.phy_id, MII_BMCR);
				mdio_write(dev, lp->mii_if.phy_id, MII_BMCR,
					   bmcr | BMCR_ISOLATE);

				/* de-isolate new phy */
				bmcr = mdio_read(dev, i, MII_BMCR);
				mdio_write(dev, i, MII_BMCR,
					   bmcr & ~BMCR_ISOLATE);

				/* set new phy address */
				lp->mii_if.phy_id = i;
				return 1;
			}
		}
	}
	return 0;
}

/*
 * Show the status of the media.  Similar to mii_check_media however it
 * correctly shows the link speed for all (tested) pcnet32 variants.
 * Devices with no mii just report link state without speed.
 *
 * Caller is assumed to hold and release the lp->lock.
 */

static void pcnet32_check_media(struct net_device *dev, int verbose)
{
	struct pcnet32_private *lp = dev->priv;
	int curr_link;
	int prev_link = netif_carrier_ok(dev) ? 1 : 0;
	u32 bcr9;

	if (lp->mii) {
		curr_link = mii_link_ok(&lp->mii_if);
	} else {
		ulong ioaddr = dev->base_addr;	/* card base I/O address */
		curr_link = (lp->a.read_bcr(ioaddr, 4) != 0xc0);
	}
	if (!curr_link) {
		if (prev_link || verbose) {
			netif_carrier_off(dev);
			if (netif_msg_link(lp))
				printk(KERN_INFO "%s: link down\n", dev->name);
		}
		if (lp->phycount > 1) {
			curr_link = pcnet32_check_otherphy(dev);
			prev_link = 0;
		}
	} else if (verbose || !prev_link) {
		netif_carrier_on(dev);
		if (lp->mii) {
			if (netif_msg_link(lp)) {
				struct ethtool_cmd ecmd;
				mii_ethtool_gset(&lp->mii_if, &ecmd);
				printk(KERN_INFO
				       "%s: link up, %sMbps, %s-duplex\n",
				       dev->name,
				       (ecmd.speed == SPEED_100) ? "100" : "10",
				       (ecmd.duplex ==
					DUPLEX_FULL) ? "full" : "half");
			}
			bcr9 = lp->a.read_bcr(dev->base_addr, 9);
			if ((bcr9 & (1 << 0)) != lp->mii_if.full_duplex) {
				if (lp->mii_if.full_duplex)
					bcr9 |= (1 << 0);
				else
					bcr9 &= ~(1 << 0);
				lp->a.write_bcr(dev->base_addr, 9, bcr9);
			}
		} else {
			if (netif_msg_link(lp))
				printk(KERN_INFO "%s: link up\n", dev->name);
		}
	}
}

/*
 * Check for loss of link and link establishment.
 * Can not use mii_check_media because it does nothing if mode is forced.
 */

static void pcnet32_watchdog(struct net_device *dev)
{
	struct pcnet32_private *lp = dev->priv;
	unsigned long flags;

	/* Print the link status if it has changed */
	spin_lock_irqsave(&lp->lock, flags);
	pcnet32_check_media(dev, 0);
	spin_unlock_irqrestore(&lp->lock, flags);

	mod_timer(&(lp->watchdog_timer), PCNET32_WATCHDOG_TIMEOUT);
}

static void __devexit pcnet32_remove_one(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);

	if (dev) {
		struct pcnet32_private *lp = dev->priv;

		unregister_netdev(dev);
		pcnet32_free_ring(dev);
		release_region(dev->base_addr, PCNET32_TOTAL_SIZE);
		pci_free_consistent(lp->pci_dev, sizeof(*lp), lp, lp->dma_addr);
		free_netdev(dev);
		pci_disable_device(pdev);
		pci_set_drvdata(pdev, NULL);
	}
}

static struct pci_driver pcnet32_driver = {
	.name = DRV_NAME,
	.probe = pcnet32_probe_pci,
	.remove = __devexit_p(pcnet32_remove_one),
	.id_table = pcnet32_pci_tbl,
};

/* An additional parameter that may be passed in... */
static int debug = -1;
static int tx_start_pt = -1;
static int pcnet32_have_pci;

module_param(debug, int, 0);
MODULE_PARM_DESC(debug, DRV_NAME " debug level");
module_param(max_interrupt_work, int, 0);
MODULE_PARM_DESC(max_interrupt_work,
		 DRV_NAME " maximum events handled per interrupt");
module_param(rx_copybreak, int, 0);
MODULE_PARM_DESC(rx_copybreak,
		 DRV_NAME " copy breakpoint for copy-only-tiny-frames");
module_param(tx_start_pt, int, 0);
MODULE_PARM_DESC(tx_start_pt, DRV_NAME " transmit start point (0-3)");
module_param(pcnet32vlb, int, 0);
MODULE_PARM_DESC(pcnet32vlb, DRV_NAME " Vesa local bus (VLB) support (0/1)");
module_param_array(options, int, NULL, 0);
MODULE_PARM_DESC(options, DRV_NAME " initial option setting(s) (0-15)");
module_param_array(full_duplex, int, NULL, 0);
MODULE_PARM_DESC(full_duplex, DRV_NAME " full duplex setting(s) (1)");
/* Module Parameter for HomePNA cards added by Patrick Simmons, 2004 */
module_param_array(homepna, int, NULL, 0);
MODULE_PARM_DESC(homepna,
		 DRV_NAME
		 " mode for 79C978 cards (1 for HomePNA, 0 for Ethernet, default Ethernet");

MODULE_AUTHOR("Thomas Bogendoerfer");
MODULE_DESCRIPTION("Driver for PCnet32 and PCnetPCI based ethercards");
MODULE_LICENSE("GPL");

#define PCNET32_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)

static int __init pcnet32_init_module(void)
{
	printk(KERN_INFO "%s", version);

	pcnet32_debug = netif_msg_init(debug, PCNET32_MSG_DEFAULT);

	if ((tx_start_pt >= 0) && (tx_start_pt <= 3))
		tx_start = tx_start_pt;

	/* find the PCI devices */
	if (!pci_module_init(&pcnet32_driver))
		pcnet32_have_pci = 1;

	/* should we find any remaining VLbus devices ? */
	if (pcnet32vlb)
		pcnet32_probe_vlbus(pcnet32_portlist);

	if (cards_found && (pcnet32_debug & NETIF_MSG_PROBE))
		printk(KERN_INFO PFX "%d cards_found.\n", cards_found);

	return (pcnet32_have_pci + cards_found) ? 0 : -ENODEV;
}

static void __exit pcnet32_cleanup_module(void)
{
	struct net_device *next_dev;

	while (pcnet32_dev) {
		struct pcnet32_private *lp = pcnet32_dev->priv;
		next_dev = lp->next;
		unregister_netdev(pcnet32_dev);
		pcnet32_free_ring(pcnet32_dev);
		release_region(pcnet32_dev->base_addr, PCNET32_TOTAL_SIZE);
		pci_free_consistent(lp->pci_dev, sizeof(*lp), lp, lp->dma_addr);
		free_netdev(pcnet32_dev);
		pcnet32_dev = next_dev;
	}

	if (pcnet32_have_pci)
		pci_unregister_driver(&pcnet32_driver);
}

module_init(pcnet32_init_module);
module_exit(pcnet32_cleanup_module);

/*
 * Local variables:
 *  c-indent-level: 4
 *  tab-width: 8
 * End:
 */