summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/i825xx/eexpress.c
blob: cc2e66ad4436e1852a6b1f12977c0126db80ae1c (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
/* Intel EtherExpress 16 device driver for Linux
 *
 * Written by John Sullivan, 1995
 *  based on original code by Donald Becker, with changes by
 *  Alan Cox and Pauline Middelink.
 *
 * Support for 8-bit mode by Zoltan Szilagyi <zoltans@cs.arizona.edu>
 *
 * Many modifications, and currently maintained, by
 *  Philip Blundell <philb@gnu.org>
 * Added the Compaq LTE  Alan Cox <alan@lxorguk.ukuu.org.uk>
 * Added MCA support Adam Fritzler
 *
 * Note - this driver is experimental still - it has problems on faster
 * machines. Someone needs to sit down and go through it line by line with
 * a databook...
 */

/* The EtherExpress 16 is a fairly simple card, based on a shared-memory
 * design using the i82586 Ethernet coprocessor.  It bears no relationship,
 * as far as I know, to the similarly-named "EtherExpress Pro" range.
 *
 * Historically, Linux support for these cards has been very bad.  However,
 * things seem to be getting better slowly.
 */

/* If your card is confused about what sort of interface it has (eg it
 * persistently reports "10baseT" when none is fitted), running 'SOFTSET /BART'
 * or 'SOFTSET /LISA' from DOS seems to help.
 */

/* Here's the scoop on memory mapping.
 *
 * There are three ways to access EtherExpress card memory: either using the
 * shared-memory mapping, or using PIO through the dataport, or using PIO
 * through the "shadow memory" ports.
 *
 * The shadow memory system works by having the card map some of its memory
 * as follows:
 *
 * (the low five bits of the SMPTR are ignored)
 *
 *  base+0x4000..400f      memory at SMPTR+0..15
 *  base+0x8000..800f      memory at SMPTR+16..31
 *  base+0xc000..c007      dubious stuff (memory at SMPTR+16..23 apparently)
 *  base+0xc008..c00f      memory at 0x0008..0x000f
 *
 * This last set (the one at c008) is particularly handy because the SCB
 * lives at 0x0008.  So that set of ports gives us easy random access to data
 * in the SCB without having to mess around setting up pointers and the like.
 * We always use this method to access the SCB (via the scb_xx() functions).
 *
 * Dataport access works by aiming the appropriate (read or write) pointer
 * at the first address you're interested in, and then reading or writing from
 * the dataport.  The pointers auto-increment after each transfer.  We use
 * this for data transfer.
 *
 * We don't use the shared-memory system because it allegedly doesn't work on
 * all cards, and because it's a bit more prone to go wrong (it's one more
 * thing to configure...).
 */

/* Known bugs:
 *
 * - The card seems to want to give us two interrupts every time something
 *   happens, where just one would be better.
 */

/*
 *
 * Note by Zoltan Szilagyi 10-12-96:
 *
 * I've succeeded in eliminating the "CU wedged" messages, and hence the
 * lockups, which were only occurring with cards running in 8-bit mode ("force
 * 8-bit operation" in Intel's SoftSet utility). This version of the driver
 * sets the 82586 and the ASIC to 8-bit mode at startup; it also stops the
 * CU before submitting a packet for transmission, and then restarts it as soon
 * as the process of handing the packet is complete. This is definitely an
 * unnecessary slowdown if the card is running in 16-bit mode; therefore one
 * should detect 16-bit vs 8-bit mode from the EEPROM settings and act
 * accordingly. In 8-bit mode with this bugfix I'm getting about 150 K/s for
 * ftp's, which is significantly better than I get in DOS, so the overhead of
 * stopping and restarting the CU with each transmit is not prohibitive in
 * practice.
 *
 * Update by David Woodhouse 11/5/99:
 *
 * I've seen "CU wedged" messages in 16-bit mode, on the Alpha architecture.
 * I assume that this is because 16-bit accesses are actually handled as two
 * 8-bit accesses.
 */

#ifdef __alpha__
#define LOCKUP16 1
#endif
#ifndef LOCKUP16
#define LOCKUP16 0
#endif

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/mca-legacy.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/jiffies.h>

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

#ifndef NET_DEBUG
#define NET_DEBUG 4
#endif

#include "eexpress.h"

#define EEXP_IO_EXTENT  16

/*
 * Private data declarations
 */

struct net_local
{
	unsigned long last_tx;       /* jiffies when last transmit started */
	unsigned long init_time;     /* jiffies when eexp_hw_init586 called */
	unsigned short rx_first;     /* first rx buf, same as RX_BUF_START */
	unsigned short rx_last;      /* last rx buf */
	unsigned short rx_ptr;       /* first rx buf to look at */
	unsigned short tx_head;      /* next free tx buf */
	unsigned short tx_reap;      /* first in-use tx buf */
	unsigned short tx_tail;      /* previous tx buf to tx_head */
	unsigned short tx_link;      /* last known-executing tx buf */
	unsigned short last_tx_restart;   /* set to tx_link when we
					     restart the CU */
	unsigned char started;
	unsigned short rx_buf_start;
	unsigned short rx_buf_end;
	unsigned short num_tx_bufs;
	unsigned short num_rx_bufs;
	unsigned char width;         /* 0 for 16bit, 1 for 8bit */
	unsigned char was_promisc;
	unsigned char old_mc_count;
	spinlock_t lock;
};

/* This is the code and data that is downloaded to the EtherExpress card's
 * memory at boot time.
 */

static unsigned short start_code[] = {
/* 0x0000 */
	0x0001,                 /* ISCP: busy - cleared after reset */
	0x0008,0x0000,0x0000,   /* offset,address (lo,hi) of SCB */

	0x0000,0x0000,          /* SCB: status, commands */
	0x0000,0x0000,          /* links to first command block,
				   first receive descriptor */
	0x0000,0x0000,          /* CRC error, alignment error counts */
	0x0000,0x0000,          /* out of resources, overrun error counts */

	0x0000,0x0000,          /* pad */
	0x0000,0x0000,

/* 0x20 -- start of 82586 CU program */
#define CONF_LINK 0x20
	0x0000,Cmd_Config,
	0x0032,                 /* link to next command */
	0x080c,                 /* 12 bytes follow : fifo threshold=8 */
	0x2e40,                 /* don't rx bad frames
				 * SRDY/ARDY => ext. sync. : preamble len=8
	                         * take addresses from data buffers
				 * 6 bytes/address
				 */
	0x6000,                 /* default backoff method & priority
				 * interframe spacing = 0x60 */
	0xf200,                 /* slot time=0x200
				 * max collision retry = 0xf */
#define CONF_PROMISC  0x2e
	0x0000,                 /* no HDLC : normal CRC : enable broadcast
				 * disable promiscuous/multicast modes */
	0x003c,                 /* minimum frame length = 60 octets) */

	0x0000,Cmd_SetAddr,
	0x003e,                 /* link to next command */
#define CONF_HWADDR  0x38
	0x0000,0x0000,0x0000,   /* hardware address placed here */

	0x0000,Cmd_MCast,
	0x0076,                 /* link to next command */
#define CONF_NR_MULTICAST 0x44
	0x0000,                 /* number of bytes in multicast address(es) */
#define CONF_MULTICAST 0x46
	0x0000, 0x0000, 0x0000, /* some addresses */
	0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000,

#define CONF_DIAG_RESULT  0x76
	0x0000, Cmd_Diag,
	0x007c,                 /* link to next command */

	0x0000,Cmd_TDR|Cmd_INT,
	0x0084,
#define CONF_TDR_RESULT  0x82
	0x0000,

	0x0000,Cmd_END|Cmd_Nop, /* end of configure sequence */
	0x0084                  /* dummy link */
};

/* maps irq number to EtherExpress magic value */
static char irqrmap[] = { 0,0,1,2,3,4,0,0,0,1,5,6,0,0,0,0 };

#ifdef CONFIG_MCA_LEGACY
/* mapping of the first four bits of the second POS register */
static unsigned short mca_iomap[] = {
	0x270, 0x260, 0x250, 0x240, 0x230, 0x220, 0x210, 0x200,
	0x370, 0x360, 0x350, 0x340, 0x330, 0x320, 0x310, 0x300
};
/* bits 5-7 of the second POS register */
static char mca_irqmap[] = { 12, 9, 3, 4, 5, 10, 11, 15 };
#endif

/*
 * Prototypes for Linux interface
 */

static int eexp_open(struct net_device *dev);
static int eexp_close(struct net_device *dev);
static void eexp_timeout(struct net_device *dev);
static netdev_tx_t eexp_xmit(struct sk_buff *buf,
			     struct net_device *dev);

static irqreturn_t eexp_irq(int irq, void *dev_addr);
static void eexp_set_multicast(struct net_device *dev);

/*
 * Prototypes for hardware access functions
 */

static void eexp_hw_rx_pio(struct net_device *dev);
static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
		       unsigned short len);
static int eexp_hw_probe(struct net_device *dev,unsigned short ioaddr);
static unsigned short eexp_hw_readeeprom(unsigned short ioaddr,
					 unsigned char location);

static unsigned short eexp_hw_lasttxstat(struct net_device *dev);
static void eexp_hw_txrestart(struct net_device *dev);

static void eexp_hw_txinit    (struct net_device *dev);
static void eexp_hw_rxinit    (struct net_device *dev);

static void eexp_hw_init586   (struct net_device *dev);
static void eexp_setup_filter (struct net_device *dev);

static char *eexp_ifmap[]={"AUI", "BNC", "RJ45"};
enum eexp_iftype {AUI=0, BNC=1, TPE=2};

#define STARTED_RU      2
#define STARTED_CU      1

/*
 * Primitive hardware access functions.
 */

static inline unsigned short scb_status(struct net_device *dev)
{
	return inw(dev->base_addr + 0xc008);
}

static inline unsigned short scb_rdcmd(struct net_device *dev)
{
	return inw(dev->base_addr + 0xc00a);
}

static inline void scb_command(struct net_device *dev, unsigned short cmd)
{
	outw(cmd, dev->base_addr + 0xc00a);
}

static inline void scb_wrcbl(struct net_device *dev, unsigned short val)
{
	outw(val, dev->base_addr + 0xc00c);
}

static inline void scb_wrrfa(struct net_device *dev, unsigned short val)
{
	outw(val, dev->base_addr + 0xc00e);
}

static inline void set_loopback(struct net_device *dev)
{
	outb(inb(dev->base_addr + Config) | 2, dev->base_addr + Config);
}

static inline void clear_loopback(struct net_device *dev)
{
	outb(inb(dev->base_addr + Config) & ~2, dev->base_addr + Config);
}

static inline unsigned short int SHADOW(short int addr)
{
	addr &= 0x1f;
	if (addr > 0xf) addr += 0x3ff0;
	return addr + 0x4000;
}

/*
 * Linux interface
 */

/*
 * checks for presence of EtherExpress card
 */

static int __init do_express_probe(struct net_device *dev)
{
	unsigned short *port;
	static unsigned short ports[] = { 0x240,0x300,0x310,0x270,0x320,0x340,0 };
	unsigned short ioaddr = dev->base_addr;
	int dev_irq = dev->irq;
	int err;

	dev->if_port = 0xff; /* not set */

#ifdef CONFIG_MCA_LEGACY
	if (MCA_bus) {
		int slot = 0;

		/*
		 * Only find one card at a time.  Subsequent calls
		 * will find others, however, proper multicard MCA
		 * probing and setup can't be done with the
		 * old-style Space.c init routines.  -- ASF
		 */
		while (slot != MCA_NOTFOUND) {
			int pos0, pos1;

			slot = mca_find_unused_adapter(0x628B, slot);
			if (slot == MCA_NOTFOUND)
				break;

			pos0 = mca_read_stored_pos(slot, 2);
			pos1 = mca_read_stored_pos(slot, 3);
			ioaddr = mca_iomap[pos1&0xf];

			dev->irq = mca_irqmap[(pos1>>4)&0x7];

			/*
			 * XXX: Transceiver selection is done
			 * differently on the MCA version.
			 * How to get it to select something
			 * other than external/AUI is currently
			 * unknown.  This code is just for looks. -- ASF
			 */
			if ((pos0 & 0x7) == 0x1)
				dev->if_port = AUI;
			else if ((pos0 & 0x7) == 0x5) {
				if (pos1 & 0x80)
					dev->if_port = BNC;
				else
					dev->if_port = TPE;
			}

			mca_set_adapter_name(slot, "Intel EtherExpress 16 MCA");
			mca_set_adapter_procfn(slot, NULL, dev);
			mca_mark_as_used(slot);

			break;
		}
	}
#endif
	if (ioaddr&0xfe00) {
		if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress"))
			return -EBUSY;
		err = eexp_hw_probe(dev,ioaddr);
		release_region(ioaddr, EEXP_IO_EXTENT);
		return err;
	} else if (ioaddr)
		return -ENXIO;

	for (port=&ports[0] ; *port ; port++ )
	{
		unsigned short sum = 0;
		int i;
		if (!request_region(*port, EEXP_IO_EXTENT, "EtherExpress"))
			continue;
		for ( i=0 ; i<4 ; i++ )
		{
			unsigned short t;
			t = inb(*port + ID_PORT);
			sum |= (t>>4) << ((t & 0x03)<<2);
		}
		if (sum==0xbaba && !eexp_hw_probe(dev,*port)) {
			release_region(*port, EEXP_IO_EXTENT);
			return 0;
		}
		release_region(*port, EEXP_IO_EXTENT);
		dev->irq = dev_irq;
	}
	return -ENODEV;
}

#ifndef MODULE
struct net_device * __init express_probe(int unit)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
	int err;

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

	sprintf(dev->name, "eth%d", unit);
	netdev_boot_setup_check(dev);

	err = do_express_probe(dev);
	if (!err)
		return dev;
	free_netdev(dev);
	return ERR_PTR(err);
}
#endif

/*
 * open and initialize the adapter, ready for use
 */

static int eexp_open(struct net_device *dev)
{
	int ret;
	unsigned short ioaddr = dev->base_addr;
	struct net_local *lp = netdev_priv(dev);

#if NET_DEBUG > 6
	printk(KERN_DEBUG "%s: eexp_open()\n", dev->name);
#endif

	if (!dev->irq || !irqrmap[dev->irq])
		return -ENXIO;

	ret = request_irq(dev->irq, eexp_irq, 0, dev->name, dev);
	if (ret)
		return ret;

	if (!request_region(ioaddr, EEXP_IO_EXTENT, "EtherExpress")) {
		printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
			, ioaddr);
		goto err_out1;
	}
	if (!request_region(ioaddr+0x4000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
		printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
			, ioaddr+0x4000);
		goto err_out2;
	}
	if (!request_region(ioaddr+0x8000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
		printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
			, ioaddr+0x8000);
		goto err_out3;
	}
	if (!request_region(ioaddr+0xc000, EEXP_IO_EXTENT, "EtherExpress shadow")) {
		printk(KERN_WARNING "EtherExpress io port %x, is busy.\n"
			, ioaddr+0xc000);
		goto err_out4;
	}

	if (lp->width) {
		printk("%s: forcing ASIC to 8-bit mode\n", dev->name);
		outb(inb(dev->base_addr+Config)&~4, dev->base_addr+Config);
	}

	eexp_hw_init586(dev);
	netif_start_queue(dev);
#if NET_DEBUG > 6
	printk(KERN_DEBUG "%s: leaving eexp_open()\n", dev->name);
#endif
	return 0;

	err_out4:
		release_region(ioaddr+0x8000, EEXP_IO_EXTENT);
	err_out3:
		release_region(ioaddr+0x4000, EEXP_IO_EXTENT);
	err_out2:
		release_region(ioaddr, EEXP_IO_EXTENT);
	err_out1:
		free_irq(dev->irq, dev);
		return -EBUSY;
}

/*
 * close and disable the interface, leaving the 586 in reset.
 */

static int eexp_close(struct net_device *dev)
{
	unsigned short ioaddr = dev->base_addr;
	struct net_local *lp = netdev_priv(dev);

	int irq = dev->irq;

	netif_stop_queue(dev);

	outb(SIRQ_dis|irqrmap[irq],ioaddr+SET_IRQ);
	lp->started = 0;
	scb_command(dev, SCB_CUsuspend|SCB_RUsuspend);
	outb(0,ioaddr+SIGNAL_CA);
	free_irq(irq,dev);
	outb(i586_RST,ioaddr+EEPROM_Ctrl);
	release_region(ioaddr, EEXP_IO_EXTENT);
	release_region(ioaddr+0x4000, 16);
	release_region(ioaddr+0x8000, 16);
	release_region(ioaddr+0xc000, 16);

	return 0;
}

/*
 * This gets called when a higher level thinks we are broken.  Check that
 * nothing has become jammed in the CU.
 */

static void unstick_cu(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short ioaddr = dev->base_addr;

	if (lp->started)
	{
		if (time_after(jiffies, dev_trans_start(dev) + HZ/2))
		{
			if (lp->tx_link==lp->last_tx_restart)
			{
				unsigned short boguscount=200,rsst;
				printk(KERN_WARNING "%s: Retransmit timed out, status %04x, resetting...\n",
				       dev->name, scb_status(dev));
				eexp_hw_txinit(dev);
				lp->last_tx_restart = 0;
				scb_wrcbl(dev, lp->tx_link);
				scb_command(dev, SCB_CUstart);
				outb(0,ioaddr+SIGNAL_CA);
				while (!SCB_complete(rsst=scb_status(dev)))
				{
					if (!--boguscount)
					{
						boguscount=200;
						printk(KERN_WARNING "%s: Reset timed out status %04x, retrying...\n",
						       dev->name,rsst);
						scb_wrcbl(dev, lp->tx_link);
						scb_command(dev, SCB_CUstart);
						outb(0,ioaddr+SIGNAL_CA);
					}
				}
				netif_wake_queue(dev);
			}
			else
			{
				unsigned short status = scb_status(dev);
				if (SCB_CUdead(status))
				{
					unsigned short txstatus = eexp_hw_lasttxstat(dev);
					printk(KERN_WARNING "%s: Transmit timed out, CU not active status %04x %04x, restarting...\n",
					       dev->name, status, txstatus);
					eexp_hw_txrestart(dev);
				}
				else
				{
					unsigned short txstatus = eexp_hw_lasttxstat(dev);
					if (netif_queue_stopped(dev) && !txstatus)
					{
						printk(KERN_WARNING "%s: CU wedged, status %04x %04x, resetting...\n",
						       dev->name,status,txstatus);
						eexp_hw_init586(dev);
						netif_wake_queue(dev);
					}
					else
					{
						printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
					}
				}
			}
		}
	}
	else
	{
		if (time_after(jiffies, lp->init_time + 10))
		{
			unsigned short status = scb_status(dev);
			printk(KERN_WARNING "%s: i82586 startup timed out, status %04x, resetting...\n",
			       dev->name, status);
			eexp_hw_init586(dev);
			netif_wake_queue(dev);
		}
	}
}

static void eexp_timeout(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
#ifdef CONFIG_SMP
	unsigned long flags;
#endif
	int status;

	disable_irq(dev->irq);

	/*
	 *	Best would be to use synchronize_irq(); spin_lock() here
	 *	lets make it work first..
	 */

#ifdef CONFIG_SMP
	spin_lock_irqsave(&lp->lock, flags);
#endif

	status = scb_status(dev);
	unstick_cu(dev);
	printk(KERN_INFO "%s: transmit timed out, %s?\n", dev->name,
	       (SCB_complete(status)?"lost interrupt":
		"board on fire"));
	dev->stats.tx_errors++;
	lp->last_tx = jiffies;
	if (!SCB_complete(status)) {
		scb_command(dev, SCB_CUabort);
		outb(0,dev->base_addr+SIGNAL_CA);
	}
	netif_wake_queue(dev);
#ifdef CONFIG_SMP
	spin_unlock_irqrestore(&lp->lock, flags);
#endif
}

/*
 * Called to transmit a packet, or to allow us to right ourselves
 * if the kernel thinks we've died.
 */
static netdev_tx_t eexp_xmit(struct sk_buff *buf, struct net_device *dev)
{
	short length = buf->len;
#ifdef CONFIG_SMP
	struct net_local *lp = netdev_priv(dev);
	unsigned long flags;
#endif

#if NET_DEBUG > 6
	printk(KERN_DEBUG "%s: eexp_xmit()\n", dev->name);
#endif

	if (buf->len < ETH_ZLEN) {
		if (skb_padto(buf, ETH_ZLEN))
			return NETDEV_TX_OK;
		length = ETH_ZLEN;
	}

	disable_irq(dev->irq);

	/*
	 *	Best would be to use synchronize_irq(); spin_lock() here
	 *	lets make it work first..
	 */

#ifdef CONFIG_SMP
	spin_lock_irqsave(&lp->lock, flags);
#endif

	{
		unsigned short *data = (unsigned short *)buf->data;

		dev->stats.tx_bytes += length;

	        eexp_hw_tx_pio(dev,data,length);
	}
	dev_kfree_skb(buf);
#ifdef CONFIG_SMP
	spin_unlock_irqrestore(&lp->lock, flags);
#endif
	enable_irq(dev->irq);
	return NETDEV_TX_OK;
}

/*
 * Handle an EtherExpress interrupt
 * If we've finished initializing, start the RU and CU up.
 * If we've already started, reap tx buffers, handle any received packets,
 * check to make sure we've not become wedged.
 */

static unsigned short eexp_start_irq(struct net_device *dev,
				     unsigned short status)
{
	unsigned short ack_cmd = SCB_ack(status);
	struct net_local *lp = netdev_priv(dev);
	unsigned short ioaddr = dev->base_addr;
	if ((dev->flags & IFF_UP) && !(lp->started & STARTED_CU)) {
		short diag_status, tdr_status;
		while (SCB_CUstat(status)==2)
			status = scb_status(dev);
#if NET_DEBUG > 4
		printk("%s: CU went non-active (status %04x)\n",
		       dev->name, status);
#endif

		outw(CONF_DIAG_RESULT & ~31, ioaddr + SM_PTR);
		diag_status = inw(ioaddr + SHADOW(CONF_DIAG_RESULT));
		if (diag_status & 1<<11) {
			printk(KERN_WARNING "%s: 82586 failed self-test\n",
			       dev->name);
		} else if (!(diag_status & 1<<13)) {
			printk(KERN_WARNING "%s: 82586 self-test failed to complete\n", dev->name);
		}

		outw(CONF_TDR_RESULT & ~31, ioaddr + SM_PTR);
		tdr_status = inw(ioaddr + SHADOW(CONF_TDR_RESULT));
		if (tdr_status & (TDR_SHORT|TDR_OPEN)) {
			printk(KERN_WARNING "%s: TDR reports cable %s at %d tick%s\n", dev->name, (tdr_status & TDR_SHORT)?"short":"broken", tdr_status & TDR_TIME, ((tdr_status & TDR_TIME) != 1) ? "s" : "");
		}
		else if (tdr_status & TDR_XCVRPROBLEM) {
			printk(KERN_WARNING "%s: TDR reports transceiver problem\n", dev->name);
		}
		else if (tdr_status & TDR_LINKOK) {
#if NET_DEBUG > 4
			printk(KERN_DEBUG "%s: TDR reports link OK\n", dev->name);
#endif
		} else {
			printk("%s: TDR is ga-ga (status %04x)\n", dev->name,
			       tdr_status);
		}

		lp->started |= STARTED_CU;
		scb_wrcbl(dev, lp->tx_link);
		/* if the RU isn't running, start it now */
		if (!(lp->started & STARTED_RU)) {
			ack_cmd |= SCB_RUstart;
			scb_wrrfa(dev, lp->rx_buf_start);
			lp->rx_ptr = lp->rx_buf_start;
			lp->started |= STARTED_RU;
		}
		ack_cmd |= SCB_CUstart | 0x2000;
	}

	if ((dev->flags & IFF_UP) && !(lp->started & STARTED_RU) && SCB_RUstat(status)==4)
		lp->started|=STARTED_RU;

	return ack_cmd;
}

static void eexp_cmd_clear(struct net_device *dev)
{
	unsigned long int oldtime = jiffies;
	while (scb_rdcmd(dev) && (time_before(jiffies, oldtime + 10)));
	if (scb_rdcmd(dev)) {
		printk("%s: command didn't clear\n", dev->name);
	}
}

static irqreturn_t eexp_irq(int dummy, void *dev_info)
{
	struct net_device *dev = dev_info;
	struct net_local *lp;
	unsigned short ioaddr,status,ack_cmd;
	unsigned short old_read_ptr, old_write_ptr;

	lp = netdev_priv(dev);
	ioaddr = dev->base_addr;

	spin_lock(&lp->lock);

	old_read_ptr = inw(ioaddr+READ_PTR);
	old_write_ptr = inw(ioaddr+WRITE_PTR);

	outb(SIRQ_dis|irqrmap[dev->irq], ioaddr+SET_IRQ);

	status = scb_status(dev);

#if NET_DEBUG > 4
	printk(KERN_DEBUG "%s: interrupt (status %x)\n", dev->name, status);
#endif

	if (lp->started == (STARTED_CU | STARTED_RU)) {

		do {
			eexp_cmd_clear(dev);

			ack_cmd = SCB_ack(status);
			scb_command(dev, ack_cmd);
			outb(0,ioaddr+SIGNAL_CA);

			eexp_cmd_clear(dev);

			if (SCB_complete(status)) {
				if (!eexp_hw_lasttxstat(dev)) {
					printk("%s: tx interrupt but no status\n", dev->name);
				}
			}

			if (SCB_rxdframe(status))
				eexp_hw_rx_pio(dev);

			status = scb_status(dev);
		} while (status & 0xc000);

		if (SCB_RUdead(status))
		{
			printk(KERN_WARNING "%s: RU stopped: status %04x\n",
			       dev->name,status);
#if 0
			printk(KERN_WARNING "%s: cur_rfd=%04x, cur_rbd=%04x\n", dev->name, lp->cur_rfd, lp->cur_rbd);
			outw(lp->cur_rfd, ioaddr+READ_PTR);
			printk(KERN_WARNING "%s: [%04x]\n", dev->name, inw(ioaddr+DATAPORT));
			outw(lp->cur_rfd+6, ioaddr+READ_PTR);
			printk(KERN_WARNING "%s: rbd is %04x\n", dev->name, rbd= inw(ioaddr+DATAPORT));
			outw(rbd, ioaddr+READ_PTR);
			printk(KERN_WARNING "%s: [%04x %04x] ", dev->name, inw(ioaddr+DATAPORT), inw(ioaddr+DATAPORT));
			outw(rbd+8, ioaddr+READ_PTR);
			printk("[%04x]\n", inw(ioaddr+DATAPORT));
#endif
			dev->stats.rx_errors++;
#if 1
		        eexp_hw_rxinit(dev);
#else
			lp->cur_rfd = lp->first_rfd;
#endif
			scb_wrrfa(dev, lp->rx_buf_start);
			scb_command(dev, SCB_RUstart);
			outb(0,ioaddr+SIGNAL_CA);
		}
	} else {
		if (status & 0x8000)
			ack_cmd = eexp_start_irq(dev, status);
		else
			ack_cmd = SCB_ack(status);
		scb_command(dev, ack_cmd);
		outb(0,ioaddr+SIGNAL_CA);
	}

	eexp_cmd_clear(dev);

	outb(SIRQ_en|irqrmap[dev->irq], ioaddr+SET_IRQ);

#if NET_DEBUG > 6
	printk("%s: leaving eexp_irq()\n", dev->name);
#endif
	outw(old_read_ptr, ioaddr+READ_PTR);
	outw(old_write_ptr, ioaddr+WRITE_PTR);

	spin_unlock(&lp->lock);
	return IRQ_HANDLED;
}

/*
 * Hardware access functions
 */

/*
 * Set the cable type to use.
 */

static void eexp_hw_set_interface(struct net_device *dev)
{
	unsigned char oldval = inb(dev->base_addr + 0x300e);
	oldval &= ~0x82;
	switch (dev->if_port) {
	case TPE:
		oldval |= 0x2;
	case BNC:
		oldval |= 0x80;
		break;
	}
	outb(oldval, dev->base_addr+0x300e);
	mdelay(20);
}

/*
 * Check all the receive buffers, and hand any received packets
 * to the upper levels. Basic sanity check on each frame
 * descriptor, though we don't bother trying to fix broken ones.
 */

static void eexp_hw_rx_pio(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short rx_block = lp->rx_ptr;
	unsigned short boguscount = lp->num_rx_bufs;
	unsigned short ioaddr = dev->base_addr;
	unsigned short status;

#if NET_DEBUG > 6
	printk(KERN_DEBUG "%s: eexp_hw_rx()\n", dev->name);
#endif

 	do {
 		unsigned short rfd_cmd, rx_next, pbuf, pkt_len;

		outw(rx_block, ioaddr + READ_PTR);
		status = inw(ioaddr + DATAPORT);

		if (FD_Done(status))
		{
			rfd_cmd = inw(ioaddr + DATAPORT);
			rx_next = inw(ioaddr + DATAPORT);
			pbuf = inw(ioaddr + DATAPORT);

			outw(pbuf, ioaddr + READ_PTR);
			pkt_len = inw(ioaddr + DATAPORT);

			if (rfd_cmd!=0x0000)
  			{
				printk(KERN_WARNING "%s: rfd_cmd not zero:0x%04x\n",
				       dev->name, rfd_cmd);
				continue;
			}
			else if (pbuf!=rx_block+0x16)
			{
				printk(KERN_WARNING "%s: rfd and rbd out of sync 0x%04x 0x%04x\n",
				       dev->name, rx_block+0x16, pbuf);
				continue;
			}
			else if ((pkt_len & 0xc000)!=0xc000)
			{
				printk(KERN_WARNING "%s: EOF or F not set on received buffer (%04x)\n",
				       dev->name, pkt_len & 0xc000);
  				continue;
  			}
  			else if (!FD_OK(status))
			{
				dev->stats.rx_errors++;
				if (FD_CRC(status))
					dev->stats.rx_crc_errors++;
				if (FD_Align(status))
					dev->stats.rx_frame_errors++;
				if (FD_Resrc(status))
					dev->stats.rx_fifo_errors++;
				if (FD_DMA(status))
					dev->stats.rx_over_errors++;
				if (FD_Short(status))
					dev->stats.rx_length_errors++;
			}
			else
			{
				struct sk_buff *skb;
				pkt_len &= 0x3fff;
				skb = netdev_alloc_skb(dev, pkt_len + 16);
				if (skb == NULL)
				{
					printk(KERN_WARNING "%s: Memory squeeze, dropping packet\n",dev->name);
					dev->stats.rx_dropped++;
					break;
				}
				skb_reserve(skb, 2);
				outw(pbuf+10, ioaddr+READ_PTR);
			        insw(ioaddr+DATAPORT, skb_put(skb,pkt_len),(pkt_len+1)>>1);
				skb->protocol = eth_type_trans(skb,dev);
				netif_rx(skb);
				dev->stats.rx_packets++;
				dev->stats.rx_bytes += pkt_len;
			}
			outw(rx_block, ioaddr+WRITE_PTR);
			outw(0, ioaddr+DATAPORT);
			outw(0, ioaddr+DATAPORT);
			rx_block = rx_next;
		}
	} while (FD_Done(status) && boguscount--);
	lp->rx_ptr = rx_block;
}

/*
 * Hand a packet to the card for transmission
 * If we get here, we MUST have already checked
 * to make sure there is room in the transmit
 * buffer region.
 */

static void eexp_hw_tx_pio(struct net_device *dev, unsigned short *buf,
		       unsigned short len)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short ioaddr = dev->base_addr;

	if (LOCKUP16 || lp->width) {
		/* Stop the CU so that there is no chance that it
		   jumps off to a bogus address while we are writing the
		   pointer to the next transmit packet in 8-bit mode --
		   this eliminates the "CU wedged" errors in 8-bit mode.
		   (Zoltan Szilagyi 10-12-96) */
		scb_command(dev, SCB_CUsuspend);
		outw(0xFFFF, ioaddr+SIGNAL_CA);
	}

 	outw(lp->tx_head, ioaddr + WRITE_PTR);

	outw(0x0000, ioaddr + DATAPORT);
        outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
	outw(lp->tx_head+0x08, ioaddr + DATAPORT);
	outw(lp->tx_head+0x0e, ioaddr + DATAPORT);

	outw(0x0000, ioaddr + DATAPORT);
	outw(0x0000, ioaddr + DATAPORT);
	outw(lp->tx_head+0x08, ioaddr + DATAPORT);

	outw(0x8000|len, ioaddr + DATAPORT);
	outw(-1, ioaddr + DATAPORT);
	outw(lp->tx_head+0x16, ioaddr + DATAPORT);
	outw(0, ioaddr + DATAPORT);

	outsw(ioaddr + DATAPORT, buf, (len+1)>>1);

	outw(lp->tx_tail+0xc, ioaddr + WRITE_PTR);
	outw(lp->tx_head, ioaddr + DATAPORT);

	dev->trans_start = jiffies;
	lp->tx_tail = lp->tx_head;
	if (lp->tx_head==TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
		lp->tx_head = TX_BUF_START;
	else
		lp->tx_head += TX_BUF_SIZE;
	if (lp->tx_head != lp->tx_reap)
		netif_wake_queue(dev);

	if (LOCKUP16 || lp->width) {
		/* Restart the CU so that the packet can actually
		   be transmitted. (Zoltan Szilagyi 10-12-96) */
		scb_command(dev, SCB_CUresume);
		outw(0xFFFF, ioaddr+SIGNAL_CA);
	}

	dev->stats.tx_packets++;
	lp->last_tx = jiffies;
}

static const struct net_device_ops eexp_netdev_ops = {
	.ndo_open 		= eexp_open,
	.ndo_stop 		= eexp_close,
	.ndo_start_xmit		= eexp_xmit,
	.ndo_set_rx_mode	= eexp_set_multicast,
	.ndo_tx_timeout		= eexp_timeout,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

/*
 * Sanity check the suspected EtherExpress card
 * Read hardware address, reset card, size memory and initialize buffer
 * memory pointers. These are held in netdev_priv(), in case someone has more
 * than one card in a machine.
 */

static int __init eexp_hw_probe(struct net_device *dev, unsigned short ioaddr)
{
	unsigned short hw_addr[3];
	unsigned char buswidth;
	unsigned int memory_size;
	int i;
	unsigned short xsum = 0;
	struct net_local *lp = netdev_priv(dev);

	printk("%s: EtherExpress 16 at %#x ",dev->name,ioaddr);

	outb(ASIC_RST, ioaddr+EEPROM_Ctrl);
	outb(0, ioaddr+EEPROM_Ctrl);
	udelay(500);
	outb(i586_RST, ioaddr+EEPROM_Ctrl);

	hw_addr[0] = eexp_hw_readeeprom(ioaddr,2);
	hw_addr[1] = eexp_hw_readeeprom(ioaddr,3);
	hw_addr[2] = eexp_hw_readeeprom(ioaddr,4);

	/* Standard Address or Compaq LTE Address */
	if (!((hw_addr[2]==0x00aa && ((hw_addr[1] & 0xff00)==0x0000)) ||
	      (hw_addr[2]==0x0080 && ((hw_addr[1] & 0xff00)==0x5F00))))
	{
		printk(" rejected: invalid address %04x%04x%04x\n",
			hw_addr[2],hw_addr[1],hw_addr[0]);
		return -ENODEV;
	}

	/* Calculate the EEPROM checksum.  Carry on anyway if it's bad,
	 * though.
	 */
	for (i = 0; i < 64; i++)
		xsum += eexp_hw_readeeprom(ioaddr, i);
	if (xsum != 0xbaba)
		printk(" (bad EEPROM xsum 0x%02x)", xsum);

	dev->base_addr = ioaddr;
	for ( i=0 ; i<6 ; i++ )
		dev->dev_addr[i] = ((unsigned char *)hw_addr)[5-i];

	{
		static const char irqmap[] = { 0, 9, 3, 4, 5, 10, 11, 0 };
		unsigned short setupval = eexp_hw_readeeprom(ioaddr,0);

		/* Use the IRQ from EEPROM if none was given */
		if (!dev->irq)
			dev->irq = irqmap[setupval>>13];

		if (dev->if_port == 0xff) {
			dev->if_port = !(setupval & 0x1000) ? AUI :
				eexp_hw_readeeprom(ioaddr,5) & 0x1 ? TPE : BNC;
		}

		buswidth = !((setupval & 0x400) >> 10);
	}

	memset(lp, 0, sizeof(struct net_local));
	spin_lock_init(&lp->lock);

 	printk("(IRQ %d, %s connector, %d-bit bus", dev->irq,
 	       eexp_ifmap[dev->if_port], buswidth?8:16);

	if (!request_region(dev->base_addr + 0x300e, 1, "EtherExpress"))
		return -EBUSY;

 	eexp_hw_set_interface(dev);

	release_region(dev->base_addr + 0x300e, 1);

	/* Find out how much RAM we have on the card */
	outw(0, dev->base_addr + WRITE_PTR);
	for (i = 0; i < 32768; i++)
		outw(0, dev->base_addr + DATAPORT);

        for (memory_size = 0; memory_size < 64; memory_size++)
	{
		outw(memory_size<<10, dev->base_addr + READ_PTR);
		if (inw(dev->base_addr+DATAPORT))
			break;
		outw(memory_size<<10, dev->base_addr + WRITE_PTR);
		outw(memory_size | 0x5000, dev->base_addr+DATAPORT);
		outw(memory_size<<10, dev->base_addr + READ_PTR);
		if (inw(dev->base_addr+DATAPORT) != (memory_size | 0x5000))
			break;
	}

	/* Sort out the number of buffers.  We may have 16, 32, 48 or 64k
	 * of RAM to play with.
	 */
	lp->num_tx_bufs = 4;
	lp->rx_buf_end = 0x3ff6;
	switch (memory_size)
	{
	case 64:
		lp->rx_buf_end += 0x4000;
	case 48:
		lp->num_tx_bufs += 4;
		lp->rx_buf_end += 0x4000;
	case 32:
		lp->rx_buf_end += 0x4000;
	case 16:
		printk(", %dk RAM)\n", memory_size);
		break;
	default:
		printk(") bad memory size (%dk).\n", memory_size);
		return -ENODEV;
		break;
	}

	lp->rx_buf_start = TX_BUF_START + (lp->num_tx_bufs*TX_BUF_SIZE);
	lp->width = buswidth;

	dev->netdev_ops = &eexp_netdev_ops;
	dev->watchdog_timeo = 2*HZ;

	return register_netdev(dev);
}

/*
 * Read a word from the EtherExpress on-board serial EEPROM.
 * The EEPROM contains 64 words of 16 bits.
 */
static unsigned short __init eexp_hw_readeeprom(unsigned short ioaddr,
						    unsigned char location)
{
	unsigned short cmd = 0x180|(location&0x7f);
	unsigned short rval = 0,wval = EC_CS|i586_RST;
	int i;

	outb(EC_CS|i586_RST,ioaddr+EEPROM_Ctrl);
	for (i=0x100 ; i ; i>>=1 )
	{
		if (cmd&i)
			wval |= EC_Wr;
		else
			wval &= ~EC_Wr;

		outb(wval,ioaddr+EEPROM_Ctrl);
		outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
		eeprom_delay();
		outb(wval,ioaddr+EEPROM_Ctrl);
		eeprom_delay();
	}
	wval &= ~EC_Wr;
	outb(wval,ioaddr+EEPROM_Ctrl);
	for (i=0x8000 ; i ; i>>=1 )
	{
		outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
		eeprom_delay();
		if (inb(ioaddr+EEPROM_Ctrl)&EC_Rd)
			rval |= i;
		outb(wval,ioaddr+EEPROM_Ctrl);
		eeprom_delay();
	}
	wval &= ~EC_CS;
	outb(wval|EC_Clk,ioaddr+EEPROM_Ctrl);
	eeprom_delay();
	outb(wval,ioaddr+EEPROM_Ctrl);
	eeprom_delay();
	return rval;
}

/*
 * Reap tx buffers and return last transmit status.
 * if ==0 then either:
 *    a) we're not transmitting anything, so why are we here?
 *    b) we've died.
 * otherwise, Stat_Busy(return) means we've still got some packets
 * to transmit, Stat_Done(return) means our buffers should be empty
 * again
 */

static unsigned short eexp_hw_lasttxstat(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short tx_block = lp->tx_reap;
	unsigned short status;

	if (!netif_queue_stopped(dev) && lp->tx_head==lp->tx_reap)
		return 0x0000;

	do
	{
		outw(tx_block & ~31, dev->base_addr + SM_PTR);
		status = inw(dev->base_addr + SHADOW(tx_block));
		if (!Stat_Done(status))
		{
			lp->tx_link = tx_block;
			return status;
		}
		else
		{
			lp->last_tx_restart = 0;
			dev->stats.collisions += Stat_NoColl(status);
			if (!Stat_OK(status))
			{
				char *whatsup = NULL;
				dev->stats.tx_errors++;
  				if (Stat_Abort(status))
					dev->stats.tx_aborted_errors++;
				if (Stat_TNoCar(status)) {
					whatsup = "aborted, no carrier";
					dev->stats.tx_carrier_errors++;
				}
				if (Stat_TNoCTS(status)) {
					whatsup = "aborted, lost CTS";
					dev->stats.tx_carrier_errors++;
				}
				if (Stat_TNoDMA(status)) {
					whatsup = "FIFO underran";
					dev->stats.tx_fifo_errors++;
				}
				if (Stat_TXColl(status)) {
					whatsup = "aborted, too many collisions";
					dev->stats.tx_aborted_errors++;
				}
				if (whatsup)
					printk(KERN_INFO "%s: transmit %s\n",
					       dev->name, whatsup);
			}
			else
				dev->stats.tx_packets++;
		}
		if (tx_block == TX_BUF_START+((lp->num_tx_bufs-1)*TX_BUF_SIZE))
			lp->tx_reap = tx_block = TX_BUF_START;
		else
			lp->tx_reap = tx_block += TX_BUF_SIZE;
		netif_wake_queue(dev);
	}
	while (lp->tx_reap != lp->tx_head);

	lp->tx_link = lp->tx_tail + 0x08;

	return status;
}

/*
 * This should never happen. It is called when some higher routine detects
 * that the CU has stopped, to try to restart it from the last packet we knew
 * we were working on, or the idle loop if we had finished for the time.
 */

static void eexp_hw_txrestart(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short ioaddr = dev->base_addr;

	lp->last_tx_restart = lp->tx_link;
	scb_wrcbl(dev, lp->tx_link);
	scb_command(dev, SCB_CUstart);
	outb(0,ioaddr+SIGNAL_CA);

	{
		unsigned short boguscount=50,failcount=5;
		while (!scb_status(dev))
		{
			if (!--boguscount)
			{
				if (--failcount)
				{
					printk(KERN_WARNING "%s: CU start timed out, status %04x, cmd %04x\n", dev->name, scb_status(dev), scb_rdcmd(dev));
				        scb_wrcbl(dev, lp->tx_link);
					scb_command(dev, SCB_CUstart);
					outb(0,ioaddr+SIGNAL_CA);
					boguscount = 100;
				}
				else
				{
					printk(KERN_WARNING "%s: Failed to restart CU, resetting board...\n",dev->name);
					eexp_hw_init586(dev);
					netif_wake_queue(dev);
					return;
				}
			}
		}
	}
}

/*
 * Writes down the list of transmit buffers into card memory.  Each
 * entry consists of an 82586 transmit command, followed by a jump
 * pointing to itself.  When we want to transmit a packet, we write
 * the data into the appropriate transmit buffer and then modify the
 * preceding jump to point at the new transmit command.  This means that
 * the 586 command unit is continuously active.
 */

static void eexp_hw_txinit(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short tx_block = TX_BUF_START;
	unsigned short curtbuf;
	unsigned short ioaddr = dev->base_addr;

	for ( curtbuf=0 ; curtbuf<lp->num_tx_bufs ; curtbuf++ )
	{
		outw(tx_block, ioaddr + WRITE_PTR);

	        outw(0x0000, ioaddr + DATAPORT);
		outw(Cmd_INT|Cmd_Xmit, ioaddr + DATAPORT);
		outw(tx_block+0x08, ioaddr + DATAPORT);
		outw(tx_block+0x0e, ioaddr + DATAPORT);

		outw(0x0000, ioaddr + DATAPORT);
		outw(0x0000, ioaddr + DATAPORT);
		outw(tx_block+0x08, ioaddr + DATAPORT);

		outw(0x8000, ioaddr + DATAPORT);
		outw(-1, ioaddr + DATAPORT);
		outw(tx_block+0x16, ioaddr + DATAPORT);
		outw(0x0000, ioaddr + DATAPORT);

		tx_block += TX_BUF_SIZE;
	}
	lp->tx_head = TX_BUF_START;
	lp->tx_reap = TX_BUF_START;
	lp->tx_tail = tx_block - TX_BUF_SIZE;
	lp->tx_link = lp->tx_tail + 0x08;
	lp->rx_buf_start = tx_block;

}

/*
 * Write the circular list of receive buffer descriptors to card memory.
 * The end of the list isn't marked, which means that the 82586 receive
 * unit will loop until buffers become available (this avoids it giving us
 * "out of resources" messages).
 */

static void eexp_hw_rxinit(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short rx_block = lp->rx_buf_start;
	unsigned short ioaddr = dev->base_addr;

	lp->num_rx_bufs = 0;
	lp->rx_first = lp->rx_ptr = rx_block;
	do
	{
		lp->num_rx_bufs++;

		outw(rx_block, ioaddr + WRITE_PTR);

		outw(0, ioaddr + DATAPORT);  outw(0, ioaddr+DATAPORT);
		outw(rx_block + RX_BUF_SIZE, ioaddr+DATAPORT);
		outw(0xffff, ioaddr+DATAPORT);

		outw(0x0000, ioaddr+DATAPORT);
		outw(0xdead, ioaddr+DATAPORT);
		outw(0xdead, ioaddr+DATAPORT);
		outw(0xdead, ioaddr+DATAPORT);
		outw(0xdead, ioaddr+DATAPORT);
		outw(0xdead, ioaddr+DATAPORT);
		outw(0xdead, ioaddr+DATAPORT);

		outw(0x0000, ioaddr+DATAPORT);
		outw(rx_block + RX_BUF_SIZE + 0x16, ioaddr+DATAPORT);
		outw(rx_block + 0x20, ioaddr+DATAPORT);
		outw(0, ioaddr+DATAPORT);
		outw(RX_BUF_SIZE-0x20, ioaddr+DATAPORT);

		lp->rx_last = rx_block;
		rx_block += RX_BUF_SIZE;
	} while (rx_block <= lp->rx_buf_end-RX_BUF_SIZE);


	/* Make first Rx frame descriptor point to first Rx buffer
           descriptor */
	outw(lp->rx_first + 6, ioaddr+WRITE_PTR);
	outw(lp->rx_first + 0x16, ioaddr+DATAPORT);

	/* Close Rx frame descriptor ring */
  	outw(lp->rx_last + 4, ioaddr+WRITE_PTR);
  	outw(lp->rx_first, ioaddr+DATAPORT);

	/* Close Rx buffer descriptor ring */
	outw(lp->rx_last + 0x16 + 2, ioaddr+WRITE_PTR);
	outw(lp->rx_first + 0x16, ioaddr+DATAPORT);

}

/*
 * Un-reset the 586, and start the configuration sequence. We don't wait for
 * this to finish, but allow the interrupt handler to start the CU and RU for
 * us.  We can't start the receive/transmission system up before we know that
 * the hardware is configured correctly.
 */

static void eexp_hw_init586(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned short ioaddr = dev->base_addr;
	int i;

#if NET_DEBUG > 6
	printk("%s: eexp_hw_init586()\n", dev->name);
#endif

	lp->started = 0;

	set_loopback(dev);

	outb(SIRQ_dis|irqrmap[dev->irq],ioaddr+SET_IRQ);

	/* Download the startup code */
	outw(lp->rx_buf_end & ~31, ioaddr + SM_PTR);
	outw(lp->width?0x0001:0x0000, ioaddr + 0x8006);
	outw(0x0000, ioaddr + 0x8008);
	outw(0x0000, ioaddr + 0x800a);
	outw(0x0000, ioaddr + 0x800c);
	outw(0x0000, ioaddr + 0x800e);

	for (i = 0; i < ARRAY_SIZE(start_code) * 2; i+=32) {
		int j;
		outw(i, ioaddr + SM_PTR);
		for (j = 0; j < 16 && (i+j)/2 < ARRAY_SIZE(start_code); j+=2)
			outw(start_code[(i+j)/2],
			     ioaddr+0x4000+j);
		for (j = 0; j < 16 && (i+j+16)/2 < ARRAY_SIZE(start_code); j+=2)
			outw(start_code[(i+j+16)/2],
			     ioaddr+0x8000+j);
	}

	/* Do we want promiscuous mode or multicast? */
	outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
	i = inw(ioaddr+SHADOW(CONF_PROMISC));
	outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
	     ioaddr+SHADOW(CONF_PROMISC));
	lp->was_promisc = dev->flags & IFF_PROMISC;
#if 0
	eexp_setup_filter(dev);
#endif

	/* Write our hardware address */
	outw(CONF_HWADDR & ~31, ioaddr+SM_PTR);
	outw(((unsigned short *)dev->dev_addr)[0], ioaddr+SHADOW(CONF_HWADDR));
	outw(((unsigned short *)dev->dev_addr)[1],
	     ioaddr+SHADOW(CONF_HWADDR+2));
	outw(((unsigned short *)dev->dev_addr)[2],
	     ioaddr+SHADOW(CONF_HWADDR+4));

	eexp_hw_txinit(dev);
	eexp_hw_rxinit(dev);

	outb(0,ioaddr+EEPROM_Ctrl);
	mdelay(5);

	scb_command(dev, 0xf000);
	outb(0,ioaddr+SIGNAL_CA);

	outw(0, ioaddr+SM_PTR);

	{
		unsigned short rboguscount=50,rfailcount=5;
		while (inw(ioaddr+0x4000))
		{
			if (!--rboguscount)
			{
				printk(KERN_WARNING "%s: i82586 reset timed out, kicking...\n",
					dev->name);
				scb_command(dev, 0);
				outb(0,ioaddr+SIGNAL_CA);
				rboguscount = 100;
				if (!--rfailcount)
				{
					printk(KERN_WARNING "%s: i82586 not responding, giving up.\n",
						dev->name);
					return;
				}
			}
		}
	}

        scb_wrcbl(dev, CONF_LINK);
	scb_command(dev, 0xf000|SCB_CUstart);
	outb(0,ioaddr+SIGNAL_CA);

	{
		unsigned short iboguscount=50,ifailcount=5;
		while (!scb_status(dev))
		{
			if (!--iboguscount)
			{
				if (--ifailcount)
				{
					printk(KERN_WARNING "%s: i82586 initialization timed out, status %04x, cmd %04x\n",
						dev->name, scb_status(dev), scb_rdcmd(dev));
					scb_wrcbl(dev, CONF_LINK);
				        scb_command(dev, 0xf000|SCB_CUstart);
					outb(0,ioaddr+SIGNAL_CA);
					iboguscount = 100;
				}
				else
				{
					printk(KERN_WARNING "%s: Failed to initialize i82586, giving up.\n",dev->name);
					return;
				}
			}
		}
	}

	clear_loopback(dev);
	outb(SIRQ_en|irqrmap[dev->irq],ioaddr+SET_IRQ);

	lp->init_time = jiffies;
#if NET_DEBUG > 6
        printk("%s: leaving eexp_hw_init586()\n", dev->name);
#endif
}

static void eexp_setup_filter(struct net_device *dev)
{
	struct netdev_hw_addr *ha;
	unsigned short ioaddr = dev->base_addr;
	int count = netdev_mc_count(dev);
	int i;
	if (count > 8) {
		printk(KERN_INFO "%s: too many multicast addresses (%d)\n",
		       dev->name, count);
		count = 8;
	}

	outw(CONF_NR_MULTICAST & ~31, ioaddr+SM_PTR);
	outw(6*count, ioaddr+SHADOW(CONF_NR_MULTICAST));
	i = 0;
	netdev_for_each_mc_addr(ha, dev) {
		unsigned short *data = (unsigned short *) ha->addr;

		if (i == count)
			break;
		outw((CONF_MULTICAST+(6*i)) & ~31, ioaddr+SM_PTR);
		outw(data[0], ioaddr+SHADOW(CONF_MULTICAST+(6*i)));
		outw((CONF_MULTICAST+(6*i)+2) & ~31, ioaddr+SM_PTR);
		outw(data[1], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+2));
		outw((CONF_MULTICAST+(6*i)+4) & ~31, ioaddr+SM_PTR);
		outw(data[2], ioaddr+SHADOW(CONF_MULTICAST+(6*i)+4));
		i++;
	}
}

/*
 * Set or clear the multicast filter for this adaptor.
 */
static void
eexp_set_multicast(struct net_device *dev)
{
        unsigned short ioaddr = dev->base_addr;
        struct net_local *lp = netdev_priv(dev);
        int kick = 0, i;
        if ((dev->flags & IFF_PROMISC) != lp->was_promisc) {
                outw(CONF_PROMISC & ~31, ioaddr+SM_PTR);
                i = inw(ioaddr+SHADOW(CONF_PROMISC));
                outw((dev->flags & IFF_PROMISC)?(i|1):(i & ~1),
                     ioaddr+SHADOW(CONF_PROMISC));
                lp->was_promisc = dev->flags & IFF_PROMISC;
                kick = 1;
        }
        if (!(dev->flags & IFF_PROMISC)) {
                eexp_setup_filter(dev);
                if (lp->old_mc_count != netdev_mc_count(dev)) {
                        kick = 1;
                        lp->old_mc_count = netdev_mc_count(dev);
                }
        }
        if (kick) {
                unsigned long oj;
                scb_command(dev, SCB_CUsuspend);
                outb(0, ioaddr+SIGNAL_CA);
                outb(0, ioaddr+SIGNAL_CA);
#if 0
                printk("%s: waiting for CU to go suspended\n", dev->name);
#endif
                oj = jiffies;
                while ((SCB_CUstat(scb_status(dev)) == 2) &&
                       (time_before(jiffies, oj + 2000)));
		if (SCB_CUstat(scb_status(dev)) == 2)
			printk("%s: warning, CU didn't stop\n", dev->name);
                lp->started &= ~(STARTED_CU);
                scb_wrcbl(dev, CONF_LINK);
                scb_command(dev, SCB_CUstart);
                outb(0, ioaddr+SIGNAL_CA);
        }
}


/*
 * MODULE stuff
 */

#ifdef MODULE

#define EEXP_MAX_CARDS     4    /* max number of cards to support */

static struct net_device *dev_eexp[EEXP_MAX_CARDS];
static int irq[EEXP_MAX_CARDS];
static int io[EEXP_MAX_CARDS];

module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(io, "EtherExpress 16 I/O base address(es)");
MODULE_PARM_DESC(irq, "EtherExpress 16 IRQ number(s)");
MODULE_LICENSE("GPL");


/* Ideally the user would give us io=, irq= for every card.  If any parameters
 * are specified, we verify and then use them.  If no parameters are given, we
 * autoprobe for one card only.
 */
int __init init_module(void)
{
	struct net_device *dev;
	int this_dev, found = 0;

	for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
		dev = alloc_etherdev(sizeof(struct net_local));
		dev->irq = irq[this_dev];
		dev->base_addr = io[this_dev];
		if (io[this_dev] == 0) {
			if (this_dev)
				break;
			printk(KERN_NOTICE "eexpress.c: Module autoprobe not recommended, give io=xx.\n");
		}
		if (do_express_probe(dev) == 0) {
			dev_eexp[this_dev] = dev;
			found++;
			continue;
		}
		printk(KERN_WARNING "eexpress.c: Failed to register card at 0x%x.\n", io[this_dev]);
		free_netdev(dev);
		break;
	}
	if (found)
		return 0;
	return -ENXIO;
}

void __exit cleanup_module(void)
{
	int this_dev;

	for (this_dev = 0; this_dev < EEXP_MAX_CARDS; this_dev++) {
		struct net_device *dev = dev_eexp[this_dev];
		if (dev) {
			unregister_netdev(dev);
			free_netdev(dev);
		}
	}
}
#endif

/*
 * Local Variables:
 *  c-file-style: "linux"
 *  tab-width: 8
 * End:
 */