summaryrefslogtreecommitdiff
path: root/drivers/net/sk_g16.c
blob: 134ae0e6495bd8f76c5dc0805ec6198fd0fece79 (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
/*-
 * Copyright (C) 1994 by PJD Weichmann & SWS Bern, Switzerland
 *
 * This software may be used and distributed according to the terms
 * of the GNU General Public License, incorporated herein by reference.
 *
 * Module         : sk_g16.c
 *
 * Version        : $Revision: 1.1 $
 *
 * Author         : Patrick J.D. Weichmann
 *
 * Date Created   : 94/05/26
 * Last Updated   : $Date: 1994/06/30 16:25:15 $
 *
 * Description    : Schneider & Koch G16 Ethernet Device Driver for
 *                  Linux Kernel >= 1.1.22
 * Update History :
 *                  Paul Gortmaker, 03/97: Fix for v2.1.x to use read{b,w}
 *                  write{b,w} and memcpy -> memcpy_{to,from}io
 *
 *		    Jeff Garzik, 06/2000, Modularize
 *
-*/

static const char rcsid[] = "$Id: sk_g16.c,v 1.1 1994/06/30 16:25:15 root Exp $";

/*
 * The Schneider & Koch (SK) G16 Network device driver is based
 * on the 'ni6510' driver from Michael Hipp which can be found at
 * ftp://sunsite.unc.edu/pub/Linux/system/Network/drivers/nidrivers.tar.gz
 * 
 * Sources: 1) ni6510.c by M. Hipp
 *          2) depca.c  by D.C. Davies
 *          3) skeleton.c by D. Becker
 *          4) Am7990 Local Area Network Controller for Ethernet (LANCE),
 *             AMD, Pub. #05698, June 1989
 *
 * Many Thanks for helping me to get things working to: 
 *                 
 *                 A. Cox (A.Cox@swansea.ac.uk)
 *                 M. Hipp (mhipp@student.uni-tuebingen.de)
 *                 R. Bolz (Schneider & Koch, Germany)
 *
 * To Do: 
 *        - Support of SK_G8 and other SK Network Cards.
 *        - Autoset memory mapped RAM. Check for free memory and then
 *          configure RAM correctly. 
 *        - SK_close should really set card in to initial state.
 *        - Test if IRQ 3 is not switched off. Use autoirq() functionality.
 *          (as in /drivers/net/skeleton.c)
 *        - Implement Multicast addressing. At minimum something like
 *          in depca.c. 
 *        - Redo the statistics part.
 *        - Try to find out if the board is in 8 Bit or 16 Bit slot.
 *          If in 8 Bit mode don't use IRQ 11.
 *        - (Try to make it slightly faster.) 
 *	  - Power management support
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fcntl.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/string.h> 
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>

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

#include "sk_g16.h"

/* 
 * Schneider & Koch Card Definitions 
 * =================================
 */  

#define SK_NAME   "SK_G16"

/*
 * SK_G16 Configuration
 * --------------------
 */ 

/* 
 * Abbreviations
 * -------------
 *  
 * RAM - used for the 16KB shared memory 
 * Boot_ROM, ROM - are used for referencing the BootEPROM
 *
 * SK_BOOT_ROM and SK_ADDR are symbolic constants used to configure
 * the behaviour of the driver and the SK_G16.
 *
 * ! See sk_g16.install on how to install and configure the driver !   
 *
 * SK_BOOT_ROM defines if the Boot_ROM should be switched off or not.
 *
 * SK_ADDR defines the address where the RAM will be mapped into the real
 *         host memory.
 *         valid addresses are from 0xa0000 to 0xfc000 in 16Kbyte steps.
 */  
 
#define SK_BOOT_ROM     1              /* 1=BootROM on 0=off */

#define SK_ADDR         0xcc000

/* 
 * In POS3 are bits A14-A19 of the address bus. These bits can be set
 * to choose the RAM address. That's why we only can choose the RAM address
 * in 16KB steps.
 */

#define POS_ADDR       (rom_addr>>14)  /* Do not change this line */

/* 
 * SK_G16 I/O PORT's + IRQ's + Boot_ROM locations
 * ----------------------------------------------
 */

/* 
 * As nearly every card has also SK_G16 a specified I/O Port region and
 * only a few possible IRQ's.
 * In the Installation Guide from Schneider & Koch is listed a possible
 * Interrupt IRQ2. IRQ2 is always IRQ9 in boards with two cascaded interrupt
 * controllers. So we use in SK_IRQS IRQ9.
 */

/* Don't touch any of the following #defines. */

#define SK_IO_PORTS     { 0x100, 0x180, 0x208, 0x220, 0x288, 0x320, 0x328, 0x390, 0 }

#define SK_IRQS         { 3, 5, 9, 11, 0 }

#define SK_BOOT_ROM_LOCATIONS { 0xc0000, 0xc4000, 0xc8000, 0xcc000, 0xd0000, 0xd4000, 0xd8000, 0xdc000, 0 }

#define SK_BOOT_ROM_ID  { 0x55, 0xaa, 0x10, 0x50, 0x06, 0x33 }

/* 
 * SK_G16 POS REGISTERS 
 * --------------------
 */

/*
 * SK_G16 has a Programmable Option Select (POS) Register.
 * The POS is composed of 8 separate registers (POS0-7) which 
 * are I/O mapped on an address set by the W1 switch.                    
 *
 */

#define SK_POS_SIZE 8           /* 8 I/O Ports are used by SK_G16 */

#define SK_POS0     ioaddr      /* Card-ID Low (R) */
#define SK_POS1     ioaddr+1    /* Card-ID High (R) */
#define SK_POS2     ioaddr+2    /* Card-Enable, Boot-ROM Disable (RW) */
#define SK_POS3     ioaddr+3    /* Base address of RAM */
#define SK_POS4     ioaddr+4    /* IRQ */

/* POS5 - POS7 are unused */

/* 
 * SK_G16 MAC PREFIX 
 * -----------------
 */

/* 
 * Scheider & Koch manufacturer code (00:00:a5).
 * This must be checked, that we are sure it is a SK card.
 */

#define SK_MAC0         0x00
#define SK_MAC1         0x00
#define SK_MAC2         0x5a

/* 
 * SK_G16 ID 
 * ---------
 */ 

/* 
 * If POS0,POS1 contain the following ID, then we know
 * at which I/O Port Address we are. 
 */

#define SK_IDLOW  0xfd 
#define SK_IDHIGH 0x6a


/* 
 * LANCE POS Bit definitions 
 * -------------------------
 */

#define SK_ROM_RAM_ON  (POS2_CARD)
#define SK_ROM_RAM_OFF (POS2_EPROM)
#define SK_ROM_ON      (inb(SK_POS2) & POS2_CARD)
#define SK_ROM_OFF     (inb(SK_POS2) | POS2_EPROM)
#define SK_RAM_ON      (inb(SK_POS2) | POS2_CARD)
#define SK_RAM_OFF     (inb(SK_POS2) & POS2_EPROM) 

#define POS2_CARD  0x0001              /* 1 = SK_G16 on      0 = off */
#define POS2_EPROM 0x0002              /* 1 = Boot EPROM off 0 = on */ 

/* 
 * SK_G16 Memory mapped Registers
 * ------------------------------
 *
 */ 

#define SK_IOREG        (&board->ioreg) /* LANCE data registers.     */ 
#define SK_PORT         (&board->port)  /* Control, Status register  */
#define SK_IOCOM        (&board->iocom) /* I/O Command               */

/* 
 * SK_G16 Status/Control Register bits
 * -----------------------------------
 *
 * (C) Controlreg (S) Statusreg 
 */

/* 
 * Register transfer: 0 = no transfer
 *                    1 = transferring data between LANCE and I/O reg 
 */
#define SK_IORUN        0x20   

/* 
 * LANCE interrupt: 0 = LANCE interrupt occurred	
 *                  1 = no LANCE interrupt occurred
 */
#define SK_IRQ          0x10   
			
#define SK_RESET        0x08   /* Reset SK_CARD: 0 = RESET 1 = normal */
#define SK_RW           0x02   /* 0 = write to 1 = read from */
#define SK_ADR          0x01   /* 0 = REG DataPort 1 = RAP Reg addr port */

  
#define SK_RREG         SK_RW  /* Transferdirection to read from lance */
#define SK_WREG         0      /* Transferdirection to write to lance */
#define SK_RAP          SK_ADR /* Destination Register RAP */
#define SK_RDATA        0      /* Destination Register REG DataPort */

/* 
 * SK_G16 I/O Command 
 * ------------------
 */

/* 
 * Any bitcombination sets the internal I/O bit (transfer will start) 
 * when written to I/O Command
 */

#define SK_DOIO         0x80   /* Do Transfer */ 
 
/* 
 * LANCE RAP (Register Address Port). 
 * ---------------------------------
 */

/*   
 * The LANCE internal registers are selected through the RAP. 
 * The Registers are:
 *
 * CSR0 - Status and Control flags 
 * CSR1 - Low order bits of initialize block (bits 15:00)
 * CSR2 - High order bits of initialize block (bits 07:00, 15:08 are reserved)
 * CSR3 - Allows redefinition of the Bus Master Interface.
 *        This register must be set to 0x0002, which means BSWAP = 0,
 *        ACON = 1, BCON = 0;
 *
 */
 
#define CSR0            0x00   
#define CSR1            0x01  
#define CSR2            0x02 
#define CSR3            0x03

/* 
 * General Definitions 
 * ===================
 */

/* 
 * Set the number of Tx and Rx buffers, using Log_2(# buffers).
 * We have 16KB RAM which can be accessed by the LANCE. In the 
 * memory are not only the buffers but also the ring descriptors and
 * the initialize block. 
 * Don't change anything unless you really know what you do.
 */

#define LC_LOG_TX_BUFFERS 1               /* (2 == 2^^1) 2 Transmit buffers */
#define LC_LOG_RX_BUFFERS 3               /* (8 == 2^^3) 8 Receive buffers */

/* Descriptor ring sizes */

#define TMDNUM (1 << (LC_LOG_TX_BUFFERS)) /* 2 Transmit descriptor rings */
#define RMDNUM (1 << (LC_LOG_RX_BUFFERS)) /* 8 Receive Buffers */

/* Define Mask for setting RMD, TMD length in the LANCE init_block */

#define TMDNUMMASK (LC_LOG_TX_BUFFERS << 29)
#define RMDNUMMASK (LC_LOG_RX_BUFFERS << 29)

/*
 * Data Buffer size is set to maximum packet length.
 */

#define PKT_BUF_SZ              1518 

/* 
 * The number of low I/O ports used by the ethercard. 
 */

#define ETHERCARD_TOTAL_SIZE    SK_POS_SIZE

/* 
 * SK_DEBUG
 *
 * Here you can choose what level of debugging wanted.
 *
 * If SK_DEBUG and SK_DEBUG2 are undefined, then only the
 *  necessary messages will be printed.
 *
 * If SK_DEBUG is defined, there will be many debugging prints
 *  which can help to find some mistakes in configuration or even
 *  in the driver code.
 *
 * If SK_DEBUG2 is defined, many many messages will be printed 
 *  which normally you don't need. I used this to check the interrupt
 *  routine. 
 *
 * (If you define only SK_DEBUG2 then only the messages for 
 *  checking interrupts will be printed!)
 *
 * Normal way of live is: 
 *
 * For the whole thing get going let both symbolic constants
 * undefined. If you face any problems and you know what's going
 * on (you know something about the card and you can interpret some
 * hex LANCE register output) then define SK_DEBUG
 * 
 */

#undef  SK_DEBUG	/* debugging */
#undef  SK_DEBUG2	/* debugging with more verbose report */

#ifdef SK_DEBUG
#define PRINTK(x) printk x
#else
#define PRINTK(x) /**/
#endif

#ifdef SK_DEBUG2
#define PRINTK2(x) printk x
#else
#define PRINTK2(x) /**/
#endif

/* 
 * SK_G16 RAM
 *
 * The components are memory mapped and can be set in a region from
 * 0x00000 through 0xfc000 in 16KB steps. 
 *
 * The Network components are: dual ported RAM, Prom, I/O Reg, Status-,
 * Controlregister and I/O Command.
 *
 * dual ported RAM: This is the only memory region which the LANCE chip
 *      has access to. From the Lance it is addressed from 0x0000 to
 *      0x3fbf. The host accesses it normally.
 *
 * PROM: The PROM obtains the ETHERNET-MAC-Address. It is realised as a
 *       8-Bit PROM, this means only the 16 even addresses are used of the
 *       32 Byte Address region. Access to an odd address results in invalid
 *       data.
 * 
 * LANCE I/O Reg: The I/O Reg is build of 4 single Registers, Low-Byte Write,
 *       Hi-Byte Write, Low-Byte Read, Hi-Byte Read.
 *       Transfer from or to the LANCE is always in 16Bit so Low and High
 *       registers are always relevant.
 *
 *       The Data from the Readregister is not the data in the Writeregister!!
 *       
 * Port: Status- and Controlregister. 
 *       Two different registers which share the same address, Status is 
 *       read-only, Control is write-only.
 *    
 * I/O Command: 
 *       Any bitcombination written in here starts the transmission between
 *       Host and LANCE.
 */

typedef struct
{
	unsigned char  ram[0x3fc0];   /* 16KB dual ported ram */
	unsigned char  rom[0x0020];   /* 32Byte PROM containing 6Byte MAC */
	unsigned char  res1[0x0010];  /* reserved */
	unsigned volatile short ioreg;/* LANCE I/O Register */
	unsigned volatile char  port; /* Statusregister and Controlregister */
	unsigned char  iocom;         /* I/O Command Register */
} SK_RAM;

/* struct  */

/* 
 * This is the structure for the dual ported ram. We
 * have exactly 16 320 Bytes. In here there must be:
 *
 *     - Initialize Block   (starting at a word boundary)
 *     - Receive and Transmit Descriptor Rings (quadword boundary)
 *     - Data Buffers (arbitrary boundary)
 *
 * This is because LANCE has on SK_G16 only access to the dual ported
 * RAM and nowhere else.
 */

struct SK_ram
{
    struct init_block ib;
    struct tmd tmde[TMDNUM];
    struct rmd rmde[RMDNUM];
    char tmdbuf[TMDNUM][PKT_BUF_SZ];
    char rmdbuf[RMDNUM][PKT_BUF_SZ];
};

/* 
 * Structure where all necessary information is for ring buffer 
 * management and statistics.
 */

struct priv
{
    struct SK_ram *ram;  /* dual ported ram structure */
    struct rmd *rmdhead; /* start of receive ring descriptors */
    struct tmd *tmdhead; /* start of transmit ring descriptors */
    int        rmdnum;   /* actual used ring descriptor */
    int        tmdnum;   /* actual transmit descriptor for transmitting data */
    int        tmdlast;  /* last sent descriptor used for error handling, etc */
    void       *rmdbufs[RMDNUM]; /* pointer to the receive buffers */
    void       *tmdbufs[TMDNUM]; /* pointer to the transmit buffers */
    struct net_device_stats stats; /* Device driver statistics */
};

/* global variable declaration */

/* IRQ map used to reserve a IRQ (see SK_open()) */

/* static variables */

static SK_RAM *board;  /* pointer to our memory mapped board components */
static DEFINE_SPINLOCK(SK_lock);

/* Macros */


/* Function Prototypes */

/*
 * Device Driver functions
 * -----------------------
 * See for short explanation of each function its definitions header.
 */

static int   SK_probe(struct net_device *dev, short ioaddr);

static void  SK_timeout(struct net_device *dev);
static int   SK_open(struct net_device *dev);
static int   SK_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t SK_interrupt(int irq, void *dev_id, struct pt_regs * regs);
static void  SK_rxintr(struct net_device *dev);
static void  SK_txintr(struct net_device *dev);
static int   SK_close(struct net_device *dev);

static struct net_device_stats *SK_get_stats(struct net_device *dev);

unsigned int SK_rom_addr(void);

static void set_multicast_list(struct net_device *dev);

/*
 * LANCE Functions
 * ---------------
 */

static int SK_lance_init(struct net_device *dev, unsigned short mode);
void   SK_reset_board(void);
void   SK_set_RAP(int reg_number);
int    SK_read_reg(int reg_number);
int    SK_rread_reg(void);
void   SK_write_reg(int reg_number, int value);

/* 
 * Debugging functions
 * -------------------
 */

void SK_print_pos(struct net_device *dev, char *text);
void SK_print_dev(struct net_device *dev, char *text);
void SK_print_ram(struct net_device *dev);


/*-
 * Function       : SK_init
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/26
 *
 * Description    : Check for a SK_G16 network adaptor and initialize it.
 *                  This function gets called by dev_init which initializes
 *                  all Network devices.
 *
 * Parameters     : I : struct net_device *dev - structure preconfigured 
 *                                           from Space.c
 * Return Value   : 0 = Driver Found and initialized 
 * Errors         : ENODEV - no device found
 *                  ENXIO  - not probed
 * Globals        : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static int io;	/* 0 == probe */

/* 
 * Check for a network adaptor of this type, and return '0' if one exists.
 * If dev->base_addr == 0, probe all likely locations.
 * If dev->base_addr == 1, always return failure.
 */

struct net_device * __init SK_init(int unit)
{
	int *port, ports[] = SK_IO_PORTS;  /* SK_G16 supported ports */
	static unsigned version_printed;
	struct net_device *dev = alloc_etherdev(sizeof(struct priv));
	int err = -ENODEV;

	if (!dev)
		return ERR_PTR(-ENOMEM);

	if (unit >= 0) {
		sprintf(dev->name, "eth%d", unit);
		netdev_boot_setup_check(dev);
		io = dev->base_addr;
	}

	if (version_printed++ == 0)
	        PRINTK(("%s: %s", SK_NAME, rcsid));

	if (io > 0xff) {        /* Check a single specified address */
		err = -EBUSY;
		/* Check if on specified address is a SK_G16 */
		if (request_region(io, ETHERCARD_TOTAL_SIZE, "sk_g16")) {
			err = SK_probe(dev, io);
			if (!err)
				goto got_it;
			release_region(io, ETHERCARD_TOTAL_SIZE);
		}
	} else if (io > 0) {       /* Don't probe at all */
		err = -ENXIO;
	} else {
		/* Autoprobe base_addr */
		for (port = &ports[0]; *port; port++) {
			io = *port;

			/* Check if I/O Port region is used by another board */
			if (!request_region(io, ETHERCARD_TOTAL_SIZE, "sk_g16"))
				continue;       /* Try next Port address */

			/* Check if at ioaddr is a SK_G16 */
			if (SK_probe(dev, io) == 0)
				goto got_it;

			release_region(io, ETHERCARD_TOTAL_SIZE);
		}
	}
err_out:
	free_netdev(dev);
	return ERR_PTR(err);

got_it:
	err = register_netdev(dev);
	if (err) {
		release_region(dev->base_addr, ETHERCARD_TOTAL_SIZE);
		goto err_out;
	}
	return dev;

} /* End of SK_init */


MODULE_AUTHOR("Patrick J.D. Weichmann");
MODULE_DESCRIPTION("Schneider & Koch G16 Ethernet Device Driver");
MODULE_LICENSE("GPL");
MODULE_PARM(io, "i");
MODULE_PARM_DESC(io, "0 to probe common ports (unsafe), or the I/O base of the board");


#ifdef MODULE

static struct net_device *SK_dev;

static int __init SK_init_module (void)
{
 	SK_dev = SK_init(-1);
 	return IS_ERR(SK_dev) ? PTR_ERR(SK_dev) : 0;
}

static void __exit SK_cleanup_module (void)
{
 	unregister_netdev(SK_dev);
 	release_region(SK_dev->base_addr, ETHERCARD_TOTAL_SIZE);
 	free_netdev(SK_dev);
}

module_init(SK_init_module);
module_exit(SK_cleanup_module);
#endif


/*-
 * Function       : SK_probe
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/26
 *
 * Description    : This function is called by SK_init and 
 *                  does the main part of initialization.
 *                  
 * Parameters     : I : struct net_device *dev - SK_G16 device structure
 *                  I : short ioaddr       - I/O Port address where POS is.
 * Return Value   : 0 = Initialization done             
 * Errors         : ENODEV - No SK_G16 found
 *                  -1     - Configuration problem
 * Globals        : board       - pointer to SK_RAM
 * Update History :
 *     YY/MM/DD  uid  Description
 *     94/06/30  pwe  SK_ADDR now checked and at the correct place
-*/

int __init SK_probe(struct net_device *dev, short ioaddr)
{
    int i,j;                /* Counters */
    int sk_addr_flag = 0;   /* SK ADDR correct? 1 - no, 0 - yes */
    unsigned int rom_addr;  /* used to store RAM address used for POS_ADDR */

    struct priv *p = netdev_priv(dev);	/* SK_G16 private structure */

    if (inb(SK_POS0) != SK_IDLOW || inb(SK_POS1) != SK_IDHIGH)
	return -ENODEV;
    dev->base_addr = ioaddr;

    if (SK_ADDR & 0x3fff || SK_ADDR < 0xa0000)
    {
      
       sk_addr_flag = 1;

       /* 
        * Now here we could use a routine which searches for a free
        * place in the ram and set SK_ADDR if found. TODO. 
        */
    }

    if (SK_BOOT_ROM)            /* Shall we keep Boot_ROM on ? */
    {
        PRINTK(("## %s: SK_BOOT_ROM is set.\n", SK_NAME));

        rom_addr = SK_rom_addr();

	if (rom_addr == 0)      /* No Boot_ROM found */
	{
            if (sk_addr_flag)   /* No or Invalid SK_ADDR is defined */ 
            {
                printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
                       dev->name, SK_ADDR);
                return -1;
            }

	    rom_addr = SK_ADDR; /* assign predefined address */

	    PRINTK(("## %s: NO Bootrom found \n", SK_NAME));

	    outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */
	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */
	    outb(SK_RAM_ON, SK_POS2);      /* enable RAM */
	}
	else if (rom_addr == SK_ADDR) 
	{
            printk("%s: RAM + ROM are set to the same address %#08x\n"
                   "   Check configuration. Now switching off Boot_ROM\n",
                   SK_NAME, rom_addr);

	    outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off*/
	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */
	    outb(SK_RAM_ON, SK_POS2);      /* enable RAM */
	}
	else
	{
            PRINTK(("## %s: Found ROM at %#08x\n", SK_NAME, rom_addr));
	    PRINTK(("## %s: Keeping Boot_ROM on\n", SK_NAME));

            if (sk_addr_flag)       /* No or Invalid SK_ADDR is defined */ 
            {
                printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
                       dev->name, SK_ADDR);
                return -1;
            }

	    rom_addr = SK_ADDR;

	    outb(SK_ROM_RAM_OFF, SK_POS2); /* Boot_ROM + RAM off */ 
	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */
	    outb(SK_ROM_RAM_ON, SK_POS2);  /* RAM on, BOOT_ROM on */
	}
    }
    else /* Don't keep Boot_ROM */
    {
        PRINTK(("## %s: SK_BOOT_ROM is not set.\n", SK_NAME));

        if (sk_addr_flag)           /* No or Invalid SK_ADDR is defined */ 
        {
            printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
                   dev->name, SK_ADDR);
            return -1;
        }

	rom_addr = SK_rom_addr();          /* Try to find a Boot_ROM */

	/* IF we find a Boot_ROM disable it */

	outb(SK_ROM_RAM_OFF, SK_POS2);     /* Boot_ROM + RAM off */  

        /* We found a Boot_ROM and it's gone. Set RAM address on
         * Boot_ROM address. 
         */ 

	if (rom_addr) 
	{
            printk("%s: We found Boot_ROM at %#08x. Now setting RAM on"
                   "that address\n", SK_NAME, rom_addr);

	    outb(POS_ADDR, SK_POS3);       /* Set RAM on Boot_ROM address */
	}
	else /* We did not find a Boot_ROM, use predefined SK_ADDR for ram */
	{
            if (sk_addr_flag)       /* No or Invalid SK_ADDR is defined */ 
            {
                printk("%s: SK_ADDR %#08x is not valid. Check configuration.\n",
                       dev->name, SK_ADDR);
                return -1;
            }

	    rom_addr = SK_ADDR;

	    outb(POS_ADDR, SK_POS3);       /* Set RAM address */ 
	}
	outb(SK_RAM_ON, SK_POS2);          /* enable RAM */
    }

#ifdef SK_DEBUG
    SK_print_pos(dev, "POS registers after ROM, RAM config");
#endif

    board = (SK_RAM *) isa_bus_to_virt(rom_addr);

    /* Read in station address */
    for (i = 0, j = 0; i < ETH_ALEN; i++, j+=2)
    {
	dev->dev_addr[i] = readb(board->rom+j);          
    }

    /* Check for manufacturer code */
    if (!(dev->dev_addr[0] == SK_MAC0 &&
	  dev->dev_addr[1] == SK_MAC1 &&
	  dev->dev_addr[2] == SK_MAC2) )
    {
        PRINTK(("## %s: We did not find SK_G16 at RAM location.\n",
                SK_NAME)); 
	return -ENODEV;                     /* NO SK_G16 found */
    }

    printk("%s: %s found at %#3x, HW addr: %#04x:%02x:%02x:%02x:%02x:%02x\n",
	    dev->name,
	    "Schneider & Koch Netcard",
	    (unsigned int) dev->base_addr,
	    dev->dev_addr[0],
	    dev->dev_addr[1],
	    dev->dev_addr[2],
	    dev->dev_addr[3],
	    dev->dev_addr[4],
	    dev->dev_addr[5]);

    memset((char *) dev->priv, 0, sizeof(struct priv)); /* clear memory */

    /* Assign our Device Driver functions */

    dev->open                   = SK_open;
    dev->stop                   = SK_close;
    dev->hard_start_xmit        = SK_send_packet;
    dev->get_stats              = SK_get_stats;
    dev->set_multicast_list     = set_multicast_list;
    dev->tx_timeout		= SK_timeout;
    dev->watchdog_timeo		= HZ/7;


    dev->flags &= ~IFF_MULTICAST;

    /* Initialize private structure */

    p->ram = (struct SK_ram *) rom_addr; /* Set dual ported RAM addr */
    p->tmdhead = &(p->ram)->tmde[0];     /* Set TMD head */
    p->rmdhead = &(p->ram)->rmde[0];     /* Set RMD head */

    /* Initialize buffer pointers */

    for (i = 0; i < TMDNUM; i++)
    {
	p->tmdbufs[i] = &(p->ram)->tmdbuf[i];
    }

    for (i = 0; i < RMDNUM; i++)
    {
	p->rmdbufs[i] = &(p->ram)->rmdbuf[i]; 
    }

#ifdef SK_DEBUG
    SK_print_pos(dev, "End of SK_probe");
    SK_print_ram(dev);
#endif 
    return 0;                            /* Initialization done */
} /* End of SK_probe() */


/*- 
 * Function       : SK_open
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/26
 *
 * Description    : This function is called sometimes after booting 
 *                  when ifconfig program is run.
 *
 *                  This function requests an IRQ, sets the correct
 *                  IRQ in the card. Then calls SK_lance_init() to 
 *                  init and start the LANCE chip. Then if everything is 
 *                  ok returns with 0 (OK), which means SK_G16 is now
 *                  opened and operational.
 *
 *                  (Called by dev_open() /net/inet/dev.c)
 *
 * Parameters     : I : struct net_device *dev - SK_G16 device structure
 * Return Value   : 0 - Device opened
 * Errors         : -EAGAIN - Open failed
 * Side Effects   : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static int SK_open(struct net_device *dev)
{
    int i = 0;
    int irqval = 0;
    int ioaddr = dev->base_addr;

    int irqtab[] = SK_IRQS; 

    struct priv *p = netdev_priv(dev);

    PRINTK(("## %s: At beginning of SK_open(). CSR0: %#06x\n", 
           SK_NAME, SK_read_reg(CSR0)));

    if (dev->irq == 0) /* Autoirq */
    {
	i = 0;

	/* 
         * Check if one IRQ out of SK_IRQS is free and install 
	 * interrupt handler.
	 * Most done by request_irq(). 
	 * irqval: 0       - interrupt handler installed for IRQ irqtab[i]
	 *         -EBUSY  - interrupt busy 
         *         -EINVAL - irq > 15 or handler = NULL
	 */

	do
	{
	  irqval = request_irq(irqtab[i], &SK_interrupt, 0, "sk_g16", dev);
	  i++;
	} while (irqval && irqtab[i]);

	if (irqval) /* We tried every possible IRQ but no success */
	{
	    printk("%s: unable to get an IRQ\n", dev->name);
	    return -EAGAIN;
	}

	dev->irq = irqtab[--i]; 
	
	outb(i<<2, SK_POS4);           /* Set Card on probed IRQ */

    }
    else if (dev->irq == 2) /* IRQ2 is always IRQ9 */
    {
	if (request_irq(9, &SK_interrupt, 0, "sk_g16", dev))
	{
	    printk("%s: unable to get IRQ 9\n", dev->name);
	    return -EAGAIN;
	} 
	dev->irq = 9;
	
        /* 
         * Now we set card on IRQ2.
         * This can be confusing, but remember that IRQ2 on the network
         * card is in reality IRQ9
         */
	outb(0x08, SK_POS4);           /* set card to IRQ2 */

    }
    else  /* Check IRQ as defined in Space.c */
    {
	int i = 0;

	/* check if IRQ free and valid. Then install Interrupt handler */

	if (request_irq(dev->irq, &SK_interrupt, 0, "sk_g16", dev))
	{
	    printk("%s: unable to get selected IRQ\n", dev->name);
	    return -EAGAIN;
	}

	switch(dev->irq)
	{
	    case 3: i = 0;
		    break;
	    case 5: i = 1;
		    break;
	    case 2: i = 2;
		    break;
	    case 11:i = 3;
		    break;
	    default: 
		printk("%s: Preselected IRQ %d is invalid for %s boards",
		       dev->name,
		       dev->irq,
                       SK_NAME);
		return -EAGAIN;
	}      
  
	outb(i<<2, SK_POS4);           /* Set IRQ on card */
    }

    printk("%s: Schneider & Koch G16 at %#3x, IRQ %d, shared mem at %#08x\n",
	    dev->name, (unsigned int)dev->base_addr, 
	    (int) dev->irq, (unsigned int) p->ram);

    if (!(i = SK_lance_init(dev, 0)))  /* LANCE init OK? */
    {
	netif_start_queue(dev);

#ifdef SK_DEBUG

        /* 
         * This debug block tries to stop LANCE,
         * reinit LANCE with transmitter and receiver disabled,
         * then stop again and reinit with NORMAL_MODE
         */

        printk("## %s: After lance init. CSR0: %#06x\n", 
               SK_NAME, SK_read_reg(CSR0));
        SK_write_reg(CSR0, CSR0_STOP);
        printk("## %s: LANCE stopped. CSR0: %#06x\n", 
               SK_NAME, SK_read_reg(CSR0));
        SK_lance_init(dev, MODE_DTX | MODE_DRX);
        printk("## %s: Reinit with DTX + DRX off. CSR0: %#06x\n", 
               SK_NAME, SK_read_reg(CSR0));
        SK_write_reg(CSR0, CSR0_STOP);
        printk("## %s: LANCE stopped. CSR0: %#06x\n", 
               SK_NAME, SK_read_reg(CSR0));
        SK_lance_init(dev, MODE_NORMAL);
        printk("## %s: LANCE back to normal mode. CSR0: %#06x\n", 
               SK_NAME, SK_read_reg(CSR0));
        SK_print_pos(dev, "POS regs before returning OK");

#endif /* SK_DEBUG */
       
	return 0;              /* SK_open() is successful */
    }
    else /* LANCE init failed */
    {

	PRINTK(("## %s: LANCE init failed: CSR0: %#06x\n", 
               SK_NAME, SK_read_reg(CSR0)));

	return -EAGAIN;
    }

} /* End of SK_open() */


/*-
 * Function       : SK_lance_init
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/26
 *
 * Description    : Reset LANCE chip, fill RMD, TMD structures with
 *                  start values and Start LANCE.
 *
 * Parameters     : I : struct net_device *dev - SK_G16 device structure
 *                  I : int mode - put LANCE into "mode" see data-sheet for
 *                                 more info.
 * Return Value   : 0  - Init done
 * Errors         : -1 - Init failed
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static int SK_lance_init(struct net_device *dev, unsigned short mode)
{
    int i;
    unsigned long flags;
    struct priv *p = netdev_priv(dev);
    struct tmd  *tmdp;
    struct rmd  *rmdp;

    PRINTK(("## %s: At beginning of LANCE init. CSR0: %#06x\n", 
           SK_NAME, SK_read_reg(CSR0)));

    /* Reset LANCE */
    SK_reset_board();

    /* Initialize TMD's with start values */
    p->tmdnum = 0;                   /* First descriptor for transmitting */ 
    p->tmdlast = 0;                  /* First descriptor for reading stats */

    for (i = 0; i < TMDNUM; i++)     /* Init all TMD's */
    {
	tmdp = p->tmdhead + i; 
   
	writel((unsigned long) p->tmdbufs[i], tmdp->u.buffer); /* assign buffer */
	
	/* Mark TMD as start and end of packet */
	writeb(TX_STP | TX_ENP, &tmdp->u.s.status);
    }


    /* Initialize RMD's with start values */

    p->rmdnum = 0;                   /* First RMD which will be used */
 
    for (i = 0; i < RMDNUM; i++)     /* Init all RMD's */
    {
	rmdp = p->rmdhead + i;

	
	writel((unsigned long) p->rmdbufs[i], rmdp->u.buffer); /* assign buffer */
	
	/* 
         * LANCE must be owner at beginning so that he can fill in 
	 * receiving packets, set status and release RMD 
	 */

	writeb(RX_OWN, &rmdp->u.s.status);

	writew(-PKT_BUF_SZ, &rmdp->blen); /* Buffer Size (two's complement) */

	writeb(0, &rmdp->mlen);           /* init message length */       
	
    }

    /* Fill LANCE Initialize Block */

    writew(mode, (&((p->ram)->ib.mode))); /* Set operation mode */

    for (i = 0; i < ETH_ALEN; i++)   /* Set physical address */
    {
	writeb(dev->dev_addr[i], (&((p->ram)->ib.paddr[i]))); 
    }

    for (i = 0; i < 8; i++)          /* Set multicast, logical address */
    {
	writeb(0, (&((p->ram)->ib.laddr[i]))); /* We do not use logical addressing */
    } 

    /* Set ring descriptor pointers and set number of descriptors */

    writel((int)p->rmdhead | RMDNUMMASK, (&((p->ram)->ib.rdrp)));
    writel((int)p->tmdhead | TMDNUMMASK, (&((p->ram)->ib.tdrp)));

    /* Prepare LANCE Control and Status Registers */

    spin_lock_irqsave(&SK_lock, flags);

    SK_write_reg(CSR3, CSR3_ACON);   /* Ale Control !!!THIS MUST BE SET!!!! */
 
    /* 
     * LANCE addresses the RAM from 0x0000 to 0x3fbf and has no access to
     * PC Memory locations.
     *
     * In structure SK_ram is defined that the first thing in ram
     * is the initialization block. So his address is for LANCE always
     * 0x0000
     *
     * CSR1 contains low order bits 15:0 of initialization block address
     * CSR2 is built of: 
     *    7:0  High order bits 23:16 of initialization block address
     *   15:8  reserved, must be 0
     */
    
    /* Set initialization block address (must be on word boundary) */
    SK_write_reg(CSR1, 0);          /* Set low order bits 15:0 */
    SK_write_reg(CSR2, 0);          /* Set high order bits 23:16 */ 
    

    PRINTK(("## %s: After setting CSR1-3. CSR0: %#06x\n", 
           SK_NAME, SK_read_reg(CSR0)));

    /* Initialize LANCE */

    /* 
     * INIT = Initialize, when set, causes the LANCE to begin the
     * initialization procedure and access the Init Block.
     */

    SK_write_reg(CSR0, CSR0_INIT); 

    spin_unlock_irqrestore(&SK_lock, flags);

    /* Wait until LANCE finished initialization */
    
    SK_set_RAP(CSR0);              /* Register Address Pointer to CSR0 */

    for (i = 0; (i < 100) && !(SK_rread_reg() & CSR0_IDON); i++) 
	; /* Wait until init done or go ahead if problems (i>=100) */

    if (i >= 100) /* Something is wrong ! */
    {
	printk("%s: can't init am7990, status: %04x "
	       "init_block: %#08x\n", 
		dev->name, (int) SK_read_reg(CSR0), 
		(unsigned int) &(p->ram)->ib);

#ifdef SK_DEBUG
	SK_print_pos(dev, "LANCE INIT failed");
	SK_print_dev(dev,"Device Structure:");
#endif

	return -1;                 /* LANCE init failed */
    }

    PRINTK(("## %s: init done after %d ticks\n", SK_NAME, i));

    /* Clear Initialize done, enable Interrupts, start LANCE */

    SK_write_reg(CSR0, CSR0_IDON | CSR0_INEA | CSR0_STRT);

    PRINTK(("## %s: LANCE started. CSR0: %#06x\n", SK_NAME, 
            SK_read_reg(CSR0)));

    return 0;                      /* LANCE is up and running */

} /* End of SK_lance_init() */



/*-
 * Function       : SK_send_packet
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/27
 *
 * Description    : Writes an socket buffer into a transmit descriptor
 *                  and starts transmission.
 *
 * Parameters     : I : struct sk_buff *skb - packet to transfer
 *                  I : struct net_device *dev  - SK_G16 device structure
 * Return Value   : 0 - OK
 *                  1 - Could not transmit (dev_queue_xmit will queue it)
 *                      and try to sent it later
 * Globals        : None
 * Side Effects   : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static void SK_timeout(struct net_device *dev)
{
	printk(KERN_WARNING "%s: xmitter timed out, try to restart!\n", dev->name);
	SK_lance_init(dev, MODE_NORMAL); /* Reinit LANCE */
	netif_wake_queue(dev);		 /* Clear Transmitter flag */
	dev->trans_start = jiffies;      /* Mark Start of transmission */
}

static int SK_send_packet(struct sk_buff *skb, struct net_device *dev)
{
    struct priv *p = netdev_priv(dev);
    struct tmd *tmdp;
    static char pad[64];

    PRINTK2(("## %s: SK_send_packet() called, CSR0 %#04x.\n", 
	    SK_NAME, SK_read_reg(CSR0)));


    /* 
     * Block a timer-based transmit from overlapping. 
     * This means check if we are already in. 
     */

    netif_stop_queue (dev);

    {

	/* Evaluate Packet length */
	short len = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; 
       
	tmdp = p->tmdhead + p->tmdnum; /* Which descriptor for transmitting */

	/* Fill in Transmit Message Descriptor */

	/* Copy data into dual ported ram */

	memcpy_toio((tmdp->u.buffer & 0x00ffffff), skb->data, skb->len);
	if (len != skb->len)
		memcpy_toio((tmdp->u.buffer & 0x00ffffff) + skb->len, pad, len-skb->len);

	writew(-len, &tmdp->blen);            /* set length to transmit */

	/* 
	 * Packet start and end is always set because we use the maximum
	 * packet length as buffer length.
	 * Relinquish ownership to LANCE
	 */

	writeb(TX_OWN | TX_STP | TX_ENP, &tmdp->u.s.status);
	
	/* Start Demand Transmission */
	SK_write_reg(CSR0, CSR0_TDMD | CSR0_INEA);

	dev->trans_start = jiffies;   /* Mark start of transmission */

	/* Set pointer to next transmit buffer */
	p->tmdnum++; 
	p->tmdnum &= TMDNUM-1; 

	/* Do we own the next transmit buffer ? */
	if (! (readb(&((p->tmdhead + p->tmdnum)->u.s.status)) & TX_OWN) )
	{
	   /* 
	    * We own next buffer and are ready to transmit, so
	    * clear busy flag
	    */
	   netif_start_queue(dev);
	}

	p->stats.tx_bytes += skb->len;

    }

    dev_kfree_skb(skb);
    return 0;  
} /* End of SK_send_packet */


/*-
 * Function       : SK_interrupt
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/27
 *
 * Description    : SK_G16 interrupt handler which checks for LANCE
 *                  Errors, handles transmit and receive interrupts
 *
 * Parameters     : I : int irq, void *dev_id, struct pt_regs * regs -
 * Return Value   : None
 * Errors         : None
 * Globals        : None
 * Side Effects   : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static irqreturn_t SK_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
    int csr0;
    struct net_device *dev = dev_id;
    struct priv *p = netdev_priv(dev);


    PRINTK2(("## %s: SK_interrupt(). status: %#06x\n", 
            SK_NAME, SK_read_reg(CSR0)));

    if (dev == NULL)
    {
	printk("SK_interrupt(): IRQ %d for unknown device.\n", irq);
    }
    
    spin_lock (&SK_lock);

    csr0 = SK_read_reg(CSR0);      /* store register for checking */

    /* 
     * Acknowledge all of the current interrupt sources, disable      
     * Interrupts (INEA = 0) 
     */

    SK_write_reg(CSR0, csr0 & CSR0_CLRALL); 

    if (csr0 & CSR0_ERR) /* LANCE Error */
    {
	printk("%s: error: %04x\n", dev->name, csr0);
      
        if (csr0 & CSR0_MISS)      /* No place to store packet ? */
        { 
            p->stats.rx_dropped++;
        }
    }

    if (csr0 & CSR0_RINT)          /* Receive Interrupt (packet arrived) */ 
    {
	SK_rxintr(dev); 
    }

    if (csr0 & CSR0_TINT)          /* Transmit interrupt (packet sent) */
    {
	SK_txintr(dev);
    }

    SK_write_reg(CSR0, CSR0_INEA); /* Enable Interrupts */

    spin_unlock (&SK_lock);
    return IRQ_HANDLED;
} /* End of SK_interrupt() */ 


/*-
 * Function       : SK_txintr
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/27
 *
 * Description    : After sending a packet we check status, update
 *                  statistics and relinquish ownership of transmit 
 *                  descriptor ring.
 *
 * Parameters     : I : struct net_device *dev - SK_G16 device structure
 * Return Value   : None
 * Errors         : None
 * Globals        : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static void SK_txintr(struct net_device *dev)
{
    int tmdstat;
    struct tmd *tmdp;
    struct priv *p = netdev_priv(dev);


    PRINTK2(("## %s: SK_txintr() status: %#06x\n", 
            SK_NAME, SK_read_reg(CSR0)));

    tmdp = p->tmdhead + p->tmdlast;     /* Which buffer we sent at last ? */

    /* Set next buffer */
    p->tmdlast++;
    p->tmdlast &= TMDNUM-1;

    tmdstat = readb(&tmdp->u.s.status);

    /* 
     * We check status of transmitted packet.
     * see LANCE data-sheet for error explanation
     */
    if (tmdstat & TX_ERR) /* Error occurred */
    {
	int stat2 = readw(&tmdp->status2);

	printk("%s: TX error: %04x %04x\n", dev->name, tmdstat, stat2);

	if (stat2 & TX_TDR)    /* TDR problems? */
	{
	    printk("%s: tdr-problems \n", dev->name);
	}

	if (stat2 & TX_RTRY)   /* Failed in 16 attempts to transmit ? */
            p->stats.tx_aborted_errors++;   
        if (stat2 & TX_LCOL)   /* Late collision ? */
            p->stats.tx_window_errors++; 
	if (stat2 & TX_LCAR)   /* Loss of Carrier ? */  
            p->stats.tx_carrier_errors++;
        if (stat2 & TX_UFLO)   /* Underflow error ? */
        {
            p->stats.tx_fifo_errors++;

            /* 
             * If UFLO error occurs it will turn transmitter of.
             * So we must reinit LANCE
             */

            SK_lance_init(dev, MODE_NORMAL);
        }
	
	p->stats.tx_errors++;

	writew(0, &tmdp->status2);             /* Clear error flags */
    }
    else if (tmdstat & TX_MORE)        /* Collisions occurred ? */
    {
        /* 
         * Here I have a problem.
         * I only know that there must be one or up to 15 collisions.
         * That's why TX_MORE is set, because after 16 attempts TX_RTRY
         * will be set which means couldn't send packet aborted transfer.
         *
         * First I did not have this in but then I thought at minimum
         * we see that something was not ok.
         * If anyone knows something better than this to handle this
         * please report it.
         */ 

        p->stats.collisions++; 
    }
    else   /* Packet sent without any problems */
    {
        p->stats.tx_packets++; 
    }

    /* 
     * We mark transmitter not busy anymore, because now we have a free
     * transmit descriptor which can be filled by SK_send_packet and
     * afterwards sent by the LANCE
     * 
     * The function which do handle slow IRQ parts is do_bottom_half()
     * which runs at normal kernel priority, that means all interrupt are
     * enabled. (see kernel/irq.c)
     *  
     * net_bh does something like this:
     *  - check if already in net_bh
     *  - try to transmit something from the send queue
     *  - if something is in the receive queue send it up to higher 
     *    levels if it is a known protocol
     *  - try to transmit something from the send queue
     */

    netif_wake_queue(dev);

} /* End of SK_txintr() */


/*-
 * Function       : SK_rxintr
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/27
 *
 * Description    : Buffer sent, check for errors, relinquish ownership
 *                  of the receive message descriptor. 
 *
 * Parameters     : I : SK_G16 device structure
 * Return Value   : None
 * Globals        : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static void SK_rxintr(struct net_device *dev)
{

    struct rmd *rmdp;
    int rmdstat;
    struct priv *p = netdev_priv(dev);

    PRINTK2(("## %s: SK_rxintr(). CSR0: %#06x\n", 
            SK_NAME, SK_read_reg(CSR0)));

    rmdp = p->rmdhead + p->rmdnum;

    /* As long as we own the next entry, check status and send
     * it up to higher layer 
     */

    while (!( (rmdstat = readb(&rmdp->u.s.status)) & RX_OWN))
    {
	/* 
         * Start and end of packet must be set, because we use 
	 * the ethernet maximum packet length (1518) as buffer size.
	 * 
	 * Because our buffers are at maximum OFLO and BUFF errors are
	 * not to be concerned (see Data sheet)
	 */

	if ((rmdstat & (RX_STP | RX_ENP)) != (RX_STP | RX_ENP))
	{
	    /* Start of a frame > 1518 Bytes ? */

	    if (rmdstat & RX_STP) 
	    {
		p->stats.rx_errors++;        /* bad packet received */
		p->stats.rx_length_errors++; /* packet too long */

		printk("%s: packet too long\n", dev->name);
	    }
	    
	    /* 
             * All other packets will be ignored until a new frame with
	     * start (RX_STP) set follows.
	     * 
	     * What we do is just give descriptor free for new incoming
	     * packets. 
	     */

	    writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */ 

	}
	else if (rmdstat & RX_ERR)          /* Receive Error ? */
	{
	    printk("%s: RX error: %04x\n", dev->name, (int) rmdstat);
	    
	    p->stats.rx_errors++;

	    if (rmdstat & RX_FRAM) p->stats.rx_frame_errors++;
	    if (rmdstat & RX_CRC)  p->stats.rx_crc_errors++;

	    writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */

	}
	else /* We have a packet which can be queued for the upper layers */
	{

	    int len = readw(&rmdp->mlen) & 0x0fff;  /* extract message length from receive buffer */
	    struct sk_buff *skb;

	    skb = dev_alloc_skb(len+2); /* allocate socket buffer */ 

	    if (skb == NULL)                /* Could not get mem ? */
	    {
    
		/* 
                 * Couldn't allocate sk_buffer so we give descriptor back
		 * to Lance, update statistics and go ahead.
		 */

		writeb(RX_OWN, &rmdp->u.s.status); /* Relinquish ownership to LANCE */
		printk("%s: Couldn't allocate sk_buff, deferring packet.\n",
		       dev->name);
		p->stats.rx_dropped++;

		break;                      /* Jump out */
	    }
	    
	    /* Prepare sk_buff to queue for upper layers */

	    skb->dev = dev;
	    skb_reserve(skb,2);		/* Align IP header on 16 byte boundary */
	    
	    /* 
             * Copy data out of our receive descriptor into sk_buff.
	     *
	     * (rmdp->u.buffer & 0x00ffffff) -> get address of buffer and 
	     * ignore status fields) 
	     */

	    memcpy_fromio(skb_put(skb,len), (rmdp->u.buffer & 0x00ffffff), len);


	    /* 
             * Notify the upper protocol layers that there is another packet
	     * to handle
	     *
	     * netif_rx() always succeeds. see /net/inet/dev.c for more.
	     */

	    skb->protocol=eth_type_trans(skb,dev);
	    netif_rx(skb);                 /* queue packet and mark it for processing */
	   
	    /* 
             * Packet is queued and marked for processing so we
	     * free our descriptor and update statistics 
	     */

	    writeb(RX_OWN, &rmdp->u.s.status);
	    dev->last_rx = jiffies;
	    p->stats.rx_packets++;
	    p->stats.rx_bytes += len;


	    p->rmdnum++;
	    p->rmdnum %= RMDNUM;

	    rmdp = p->rmdhead + p->rmdnum;
	}
    }
} /* End of SK_rxintr() */


/*-
 * Function       : SK_close
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/26
 *
 * Description    : close gets called from dev_close() and should
 *                  deinstall the card (free_irq, mem etc).
 *
 * Parameters     : I : struct net_device *dev - our device structure
 * Return Value   : 0 - closed device driver
 * Errors         : None
 * Globals        : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

/* I have tried to set BOOT_ROM on and RAM off but then, after a 'ifconfig
 * down' the system stops. So I don't shut set card to init state.
 */

static int SK_close(struct net_device *dev)
{

    PRINTK(("## %s: SK_close(). CSR0: %#06x\n", 
           SK_NAME, SK_read_reg(CSR0)));

    netif_stop_queue(dev);	   /* Transmitter busy */

    printk("%s: Shutting %s down CSR0 %#06x\n", dev->name, SK_NAME, 
           (int) SK_read_reg(CSR0));

    SK_write_reg(CSR0, CSR0_STOP); /* STOP the LANCE */

    free_irq(dev->irq, dev);      /* Free IRQ */

    return 0; /* always succeed */
    
} /* End of SK_close() */


/*-
 * Function       : SK_get_stats
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/26
 *
 * Description    : Return current status structure to upper layers.
 *                  It is called by sprintf_stats (dev.c).
 *
 * Parameters     : I : struct net_device *dev   - our device structure
 * Return Value   : struct net_device_stats * - our current statistics
 * Errors         : None
 * Side Effects   : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

static struct net_device_stats *SK_get_stats(struct net_device *dev)
{

    struct priv *p = netdev_priv(dev);

    PRINTK(("## %s: SK_get_stats(). CSR0: %#06x\n", 
           SK_NAME, SK_read_reg(CSR0)));

    return &p->stats;             /* Return Device status */

} /* End of SK_get_stats() */


/*-
 * Function       : set_multicast_list
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/26
 *
 * Description    : This function gets called when a program performs
 *                  a SIOCSIFFLAGS call. Ifconfig does this if you call
 *                  'ifconfig [-]allmulti' which enables or disables the
 *                  Promiscuous mode.
 *                  Promiscuous mode is when the Network card accepts all
 *                  packets, not only the packets which match our MAC 
 *                  Address. It is useful for writing a network monitor,
 *                  but it is also a security problem. You have to remember
 *                  that all information on the net is not encrypted.
 *
 * Parameters     : I : struct net_device *dev - SK_G16 device Structure
 * Return Value   : None
 * Errors         : None
 * Globals        : None
 * Update History :
 *     YY/MM/DD  uid  Description
 *     95/10/18  ACox  New multicast calling scheme
-*/


/* Set or clear the multicast filter for SK_G16.
 */

static void set_multicast_list(struct net_device *dev)
{

    if (dev->flags&IFF_PROMISC)
    {
	/* Reinitialize LANCE with MODE_PROM set */
	SK_lance_init(dev, MODE_PROM);
    }
    else if (dev->mc_count==0 && !(dev->flags&IFF_ALLMULTI))
    {
	/* Reinitialize LANCE without MODE_PROM */
	SK_lance_init(dev, MODE_NORMAL);
    }
    else
    {
	/* Multicast with logical address filter on */
	/* Reinitialize LANCE without MODE_PROM */
	SK_lance_init(dev, MODE_NORMAL);
	
	/* Not implemented yet. */
    }
} /* End of set_multicast_list() */



/*-
 * Function       : SK_rom_addr
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/06/01
 *
 * Description    : Try to find a Boot_ROM at all possible locations
 *
 * Parameters     : None
 * Return Value   : Address where Boot_ROM is
 * Errors         : 0 - Did not find Boot_ROM
 * Globals        : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

unsigned int __init SK_rom_addr(void)
{
    int i,j;
    int rom_found = 0;
    unsigned int rom_location[] = SK_BOOT_ROM_LOCATIONS;
    unsigned char rom_id[] = SK_BOOT_ROM_ID;
    unsigned char test_byte;

    /* Autodetect Boot_ROM */
    PRINTK(("## %s: Autodetection of Boot_ROM\n", SK_NAME));

    for (i = 0; (rom_location[i] != 0) && (rom_found == 0); i++)
    {
	
	PRINTK(("##   Trying ROM location %#08x", rom_location[i]));
	
	rom_found = 1; 
	for (j = 0; j < 6; j++)
	{
	    test_byte = readb(rom_location[i]+j);
	    PRINTK((" %02x ", *test_byte));

	    if(test_byte != rom_id[j])
	    {
		rom_found = 0;
	    } 
	}
	PRINTK(("\n"));
    }

    if (rom_found == 1)
    {
	PRINTK(("## %s: Boot_ROM found at %#08x\n", 
               SK_NAME, rom_location[(i-1)]));

	return (rom_location[--i]);
    }
    else
    {
	PRINTK(("%s: No Boot_ROM found\n", SK_NAME));
	return 0;
    }
} /* End of SK_rom_addr() */



/* LANCE access functions 
 *
 * ! CSR1-3 can only be accessed when in CSR0 the STOP bit is set !
 */


/*-
 * Function       : SK_reset_board
 *
 * Author         : Patrick J.D. Weichmann
 *
 * Date Created   : 94/05/25
 *
 * Description    : This function resets SK_G16 and all components, but
 *                  POS registers are not changed
 *
 * Parameters     : None
 * Return Value   : None
 * Errors         : None
 * Globals        : SK_RAM *board - SK_RAM structure pointer
 *
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

void SK_reset_board(void)
{
    writeb(0x00, SK_PORT);       /* Reset active */
    mdelay(5);                /* Delay min 5ms */
    writeb(SK_RESET, SK_PORT);   /* Set back to normal operation */

} /* End of SK_reset_board() */


/*-
 * Function       : SK_set_RAP
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/25
 *
 * Description    : Set LANCE Register Address Port to register
 *                  for later data transfer.
 *
 * Parameters     : I : reg_number - which CSR to read/write from/to
 * Return Value   : None
 * Errors         : None
 * Globals        : SK_RAM *board - SK_RAM structure pointer
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

void SK_set_RAP(int reg_number)
{
    writew(reg_number, SK_IOREG);
    writeb(SK_RESET | SK_RAP | SK_WREG, SK_PORT);
    writeb(SK_DOIO, SK_IOCOM);

    while (readb(SK_PORT) & SK_IORUN) 
	barrier();
} /* End of SK_set_RAP() */


/*-
 * Function       : SK_read_reg
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/25
 *
 * Description    : Set RAP and read data from a LANCE CSR register
 *
 * Parameters     : I : reg_number - which CSR to read from
 * Return Value   : Register contents
 * Errors         : None
 * Globals        : SK_RAM *board - SK_RAM structure pointer
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

int SK_read_reg(int reg_number)
{
    SK_set_RAP(reg_number);

    writeb(SK_RESET | SK_RDATA | SK_RREG, SK_PORT);
    writeb(SK_DOIO, SK_IOCOM);

    while (readb(SK_PORT) & SK_IORUN)
	barrier();
    return (readw(SK_IOREG));

} /* End of SK_read_reg() */


/*-
 * Function       : SK_rread_reg
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/28
 *
 * Description    : Read data from preseted register.
 *                  This function requires that you know which
 *                  Register is actually set. Be aware that CSR1-3
 *                  can only be accessed when in CSR0 STOP is set.
 *
 * Return Value   : Register contents
 * Errors         : None
 * Globals        : SK_RAM *board - SK_RAM structure pointer
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

int SK_rread_reg(void)
{
    writeb(SK_RESET | SK_RDATA | SK_RREG, SK_PORT);

    writeb(SK_DOIO, SK_IOCOM);

    while (readb(SK_PORT) & SK_IORUN)
	barrier();
    return (readw(SK_IOREG));

} /* End of SK_rread_reg() */


/*-
 * Function       : SK_write_reg
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/25
 *
 * Description    : This function sets the RAP then fills in the
 *                  LANCE I/O Reg and starts Transfer to LANCE.
 *                  It waits until transfer has ended which is max. 7 ms
 *                  and then it returns.
 *
 * Parameters     : I : reg_number - which CSR to write to
 *                  I : value      - what value to fill into register 
 * Return Value   : None
 * Errors         : None
 * Globals        : SK_RAM *board - SK_RAM structure pointer
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

void SK_write_reg(int reg_number, int value)
{
    SK_set_RAP(reg_number);

    writew(value, SK_IOREG);
    writeb(SK_RESET | SK_RDATA | SK_WREG, SK_PORT);
    writeb(SK_DOIO, SK_IOCOM);

    while (readb(SK_PORT) & SK_IORUN)
	barrier();
} /* End of SK_write_reg */



/* 
 * Debugging functions
 * -------------------
 */

/*-
 * Function       : SK_print_pos
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/25
 *
 * Description    : This function prints out the 4 POS (Programmable
 *                  Option Select) Registers. Used mainly to debug operation.
 *
 * Parameters     : I : struct net_device *dev - SK_G16 device structure
 *                  I : char * - Text which will be printed as title
 * Return Value   : None
 * Errors         : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

void SK_print_pos(struct net_device *dev, char *text)
{
    int ioaddr = dev->base_addr;

    unsigned char pos0 = inb(SK_POS0),
		  pos1 = inb(SK_POS1),
		  pos2 = inb(SK_POS2),
		  pos3 = inb(SK_POS3),
		  pos4 = inb(SK_POS4);


    printk("## %s: %s.\n"
           "##   pos0=%#4x pos1=%#4x pos2=%#04x pos3=%#08x pos4=%#04x\n",
           SK_NAME, text, pos0, pos1, pos2, (pos3<<14), pos4);

} /* End of SK_print_pos() */



/*-
 * Function       : SK_print_dev
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/05/25
 *
 * Description    : This function simply prints out the important fields
 *                  of the device structure.
 *
 * Parameters     : I : struct net_device *dev  - SK_G16 device structure
 *                  I : char *text - Title for printing
 * Return Value   : None
 * Errors         : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

void SK_print_dev(struct net_device *dev, char *text)
{
    if (dev == NULL)
    {
	printk("## %s: Device Structure. %s\n", SK_NAME, text);
	printk("## DEVICE == NULL\n");
    }
    else
    {
	printk("## %s: Device Structure. %s\n", SK_NAME, text);
	printk("## Device Name: %s Base Address: %#06lx IRQ: %d\n", 
               dev->name, dev->base_addr, dev->irq);
	       
	printk("## next device: %#08x init function: %#08x\n", 
              (int) dev->next, (int) dev->init);
    }

} /* End of SK_print_dev() */



/*-
 * Function       : SK_print_ram
 * Author         : Patrick J.D. Weichmann
 * Date Created   : 94/06/02
 *
 * Description    : This function is used to check how are things set up
 *                  in the 16KB RAM. Also the pointers to the receive and 
 *                  transmit descriptor rings and rx and tx buffers locations.
 *                  It contains a minor bug in printing, but has no effect to the values
 *                  only newlines are not correct.
 *
 * Parameters     : I : struct net_device *dev - SK_G16 device structure
 * Return Value   : None
 * Errors         : None
 * Globals        : None
 * Update History :
 *     YY/MM/DD  uid  Description
-*/

void __init SK_print_ram(struct net_device *dev)
{

    int i;    
    struct priv *p = netdev_priv(dev);

    printk("## %s: RAM Details.\n"
           "##   RAM at %#08x tmdhead: %#08x rmdhead: %#08x initblock: %#08x\n",
           SK_NAME, 
           (unsigned int) p->ram,
           (unsigned int) p->tmdhead, 
           (unsigned int) p->rmdhead, 
           (unsigned int) &(p->ram)->ib);
           
    printk("##   ");

    for(i = 0; i < TMDNUM; i++)
    {
           if (!(i % 3)) /* Every third line do a newline */
           {
               printk("\n##   ");
           }
        printk("tmdbufs%d: %#08x ", (i+1), (int) p->tmdbufs[i]);
    }
    printk("##   ");

    for(i = 0; i < RMDNUM; i++)
    {
         if (!(i % 3)) /* Every third line do a newline */
           {
               printk("\n##   ");
           }
        printk("rmdbufs%d: %#08x ", (i+1), (int) p->rmdbufs[i]);
    } 
    printk("\n");

} /* End of SK_print_ram() */