aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/82596.c
blob: 56e68db488610d4375445481c53bc1a189e9de86 (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
/* 82596.c: A generic 82596 ethernet driver for linux. */
/*
   Based on Apricot.c
   Written 1994 by Mark Evans.
   This driver is for the Apricot 82596 bus-master interface

   Modularised 12/94 Mark Evans


   Modified to support the 82596 ethernet chips on 680x0 VME boards.
   by Richard Hirst <richard@sleepie.demon.co.uk>
   Renamed to be 82596.c

   980825:  Changed to receive directly in to sk_buffs which are
   allocated at open() time.  Eliminates copy on incoming frames
   (small ones are still copied).  Shared data now held in a
   non-cached page, so we can run on 68060 in copyback mode.

   TBD:
   * look at deferring rx frames rather than discarding (as per tulip)
   * handle tx ring full as per tulip
   * performance test to tune rx_copybreak

   Most of my modifications relate to the braindead big-endian
   implementation by Intel.  When the i596 is operating in
   'big-endian' mode, it thinks a 32 bit value of 0x12345678
   should be stored as 0x56781234.  This is a real pain, when
   you have linked lists which are shared by the 680x0 and the
   i596.

   Driver skeleton
   Written 1993 by Donald Becker.
   Copyright 1993 United States Government as represented by the Director,
   National Security Agency. This software may only be used and distributed
   according to the terms of the GNU General Public License as modified by SRC,
   incorporated herein by reference.

   The author may be reached as becker@scyld.com, or C/O
   Scyld Computing Corporation, 410 Severn Ave., Suite 210, Annapolis MD 21403

 */

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

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/pgtable.h>
#include <asm/cacheflush.h>

static char version[] __initdata =
	"82596.c $Revision: 1.5 $\n";

#define DRV_NAME	"82596"

/* DEBUG flags
 */

#define DEB_INIT	0x0001
#define DEB_PROBE	0x0002
#define DEB_SERIOUS	0x0004
#define DEB_ERRORS	0x0008
#define DEB_MULTI	0x0010
#define DEB_TDR		0x0020
#define DEB_OPEN	0x0040
#define DEB_RESET	0x0080
#define DEB_ADDCMD	0x0100
#define DEB_STATUS	0x0200
#define DEB_STARTTX	0x0400
#define DEB_RXADDR	0x0800
#define DEB_TXADDR	0x1000
#define DEB_RXFRAME	0x2000
#define DEB_INTS	0x4000
#define DEB_STRUCT	0x8000
#define DEB_ANY		0xffff


#define DEB(x,y)	if (i596_debug & (x)) y


#if defined(CONFIG_MVME16x_NET) || defined(CONFIG_MVME16x_NET_MODULE)
#define ENABLE_MVME16x_NET
#endif
#if defined(CONFIG_BVME6000_NET) || defined(CONFIG_BVME6000_NET_MODULE)
#define ENABLE_BVME6000_NET
#endif
#if defined(CONFIG_APRICOT) || defined(CONFIG_APRICOT_MODULE)
#define ENABLE_APRICOT
#endif

#ifdef ENABLE_MVME16x_NET
#include <asm/mvme16xhw.h>
#endif
#ifdef ENABLE_BVME6000_NET
#include <asm/bvme6000hw.h>
#endif

/*
 * Define various macros for Channel Attention, word swapping etc., dependent
 * on architecture.  MVME and BVME are 680x0 based, otherwise it is Intel.
 */

#ifdef __mc68000__
#define WSWAPrfd(x)  ((struct i596_rfd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPrbd(x)  ((struct i596_rbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPiscp(x) ((struct i596_iscp *)(((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPscb(x)  ((struct i596_scb *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPcmd(x)  ((struct i596_cmd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPtbd(x)  ((struct i596_tbd *) (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define WSWAPchar(x) ((char *)            (((u32)(x)<<16) | ((((u32)(x)))>>16)))
#define ISCP_BUSY	0x00010000
#define MACH_IS_APRICOT	0
#else
#define WSWAPrfd(x)     ((struct i596_rfd *)((long)x))
#define WSWAPrbd(x)     ((struct i596_rbd *)((long)x))
#define WSWAPiscp(x)    ((struct i596_iscp *)((long)x))
#define WSWAPscb(x)     ((struct i596_scb *)((long)x))
#define WSWAPcmd(x)     ((struct i596_cmd *)((long)x))
#define WSWAPtbd(x)     ((struct i596_tbd *)((long)x))
#define WSWAPchar(x)    ((char *)((long)x))
#define ISCP_BUSY	0x0001
#define MACH_IS_APRICOT	1
#endif

/*
 * The MPU_PORT command allows direct access to the 82596. With PORT access
 * the following commands are available (p5-18). The 32-bit port command
 * must be word-swapped with the most significant word written first.
 * This only applies to VME boards.
 */
#define PORT_RESET		0x00	/* reset 82596 */
#define PORT_SELFTEST		0x01	/* selftest */
#define PORT_ALTSCP		0x02	/* alternate SCB address */
#define PORT_ALTDUMP		0x03	/* Alternate DUMP address */

static int i596_debug = (DEB_SERIOUS|DEB_PROBE);

MODULE_AUTHOR("Richard Hirst");
MODULE_DESCRIPTION("i82596 driver");
MODULE_LICENSE("GPL");

module_param(i596_debug, int, 0);
MODULE_PARM_DESC(i596_debug, "i82596 debug mask");


/* Copy frames shorter than rx_copybreak, otherwise pass on up in
 * a full sized sk_buff.  Value of 100 stolen from tulip.c (!alpha).
 */
static int rx_copybreak = 100;

#define PKT_BUF_SZ	1536
#define MAX_MC_CNT	64

#define I596_TOTAL_SIZE 17

#define I596_NULL ((void *)0xffffffff)

#define CMD_EOL		0x8000	/* The last command of the list, stop. */
#define CMD_SUSP	0x4000	/* Suspend after doing cmd. */
#define CMD_INTR	0x2000	/* Interrupt after doing cmd. */

#define CMD_FLEX	0x0008	/* Enable flexible memory model */

enum commands {
	CmdNOp = 0, CmdSASetup = 1, CmdConfigure = 2, CmdMulticastList = 3,
	CmdTx = 4, CmdTDR = 5, CmdDump = 6, CmdDiagnose = 7
};

#define STAT_C		0x8000	/* Set to 0 after execution */
#define STAT_B		0x4000	/* Command being executed */
#define STAT_OK		0x2000	/* Command executed ok */
#define STAT_A		0x1000	/* Command aborted */

#define	 CUC_START	0x0100
#define	 CUC_RESUME	0x0200
#define	 CUC_SUSPEND    0x0300
#define	 CUC_ABORT	0x0400
#define	 RX_START	0x0010
#define	 RX_RESUME	0x0020
#define	 RX_SUSPEND	0x0030
#define	 RX_ABORT	0x0040

#define TX_TIMEOUT	5


struct i596_reg {
	unsigned short porthi;
	unsigned short portlo;
	unsigned long ca;
};

#define EOF		0x8000
#define SIZE_MASK	0x3fff

struct i596_tbd {
	unsigned short size;
	unsigned short pad;
	struct i596_tbd *next;
	char *data;
};

/* The command structure has two 'next' pointers; v_next is the address of
 * the next command as seen by the CPU, b_next is the address of the next
 * command as seen by the 82596.  The b_next pointer, as used by the 82596
 * always references the status field of the next command, rather than the
 * v_next field, because the 82596 is unaware of v_next.  It may seem more
 * logical to put v_next at the end of the structure, but we cannot do that
 * because the 82596 expects other fields to be there, depending on command
 * type.
 */

struct i596_cmd {
	struct i596_cmd *v_next;	/* Address from CPUs viewpoint */
	unsigned short status;
	unsigned short command;
	struct i596_cmd *b_next;	/* Address from i596 viewpoint */
};

struct tx_cmd {
	struct i596_cmd cmd;
	struct i596_tbd *tbd;
	unsigned short size;
	unsigned short pad;
	struct sk_buff *skb;	/* So we can free it after tx */
};

struct tdr_cmd {
	struct i596_cmd cmd;
	unsigned short status;
	unsigned short pad;
};

struct mc_cmd {
	struct i596_cmd cmd;
	short mc_cnt;
	char mc_addrs[MAX_MC_CNT*6];
};

struct sa_cmd {
	struct i596_cmd cmd;
	char eth_addr[8];
};

struct cf_cmd {
	struct i596_cmd cmd;
	char i596_config[16];
};

struct i596_rfd {
	unsigned short stat;
	unsigned short cmd;
	struct i596_rfd *b_next;	/* Address from i596 viewpoint */
	struct i596_rbd *rbd;
	unsigned short count;
	unsigned short size;
	struct i596_rfd *v_next;	/* Address from CPUs viewpoint */
	struct i596_rfd *v_prev;
};

struct i596_rbd {
    unsigned short count;
    unsigned short zero1;
    struct i596_rbd *b_next;
    unsigned char *b_data;		/* Address from i596 viewpoint */
    unsigned short size;
    unsigned short zero2;
    struct sk_buff *skb;
    struct i596_rbd *v_next;
    struct i596_rbd *b_addr;		/* This rbd addr from i596 view */
    unsigned char *v_data;		/* Address from CPUs viewpoint */
};

#define TX_RING_SIZE 64
#define RX_RING_SIZE 16

struct i596_scb {
	unsigned short status;
	unsigned short command;
	struct i596_cmd *cmd;
	struct i596_rfd *rfd;
	unsigned long crc_err;
	unsigned long align_err;
	unsigned long resource_err;
	unsigned long over_err;
	unsigned long rcvdt_err;
	unsigned long short_err;
	unsigned short t_on;
	unsigned short t_off;
};

struct i596_iscp {
	unsigned long stat;
	struct i596_scb *scb;
};

struct i596_scp {
	unsigned long sysbus;
	unsigned long pad;
	struct i596_iscp *iscp;
};

struct i596_private {
	volatile struct i596_scp scp;
	volatile struct i596_iscp iscp;
	volatile struct i596_scb scb;
	struct sa_cmd sa_cmd;
	struct cf_cmd cf_cmd;
	struct tdr_cmd tdr_cmd;
	struct mc_cmd mc_cmd;
	unsigned long stat;
	int last_restart __attribute__((aligned(4)));
	struct i596_rfd *rfd_head;
	struct i596_rbd *rbd_head;
	struct i596_cmd *cmd_tail;
	struct i596_cmd *cmd_head;
	int cmd_backlog;
	unsigned long last_cmd;
	struct i596_rfd rfds[RX_RING_SIZE];
	struct i596_rbd rbds[RX_RING_SIZE];
	struct tx_cmd tx_cmds[TX_RING_SIZE];
	struct i596_tbd tbds[TX_RING_SIZE];
	int next_tx_cmd;
	spinlock_t lock;
};

static char init_setup[] =
{
	0x8E,			/* length, prefetch on */
	0xC8,			/* fifo to 8, monitor off */
#ifdef CONFIG_VME
	0xc0,			/* don't save bad frames */
#else
	0x80,			/* don't save bad frames */
#endif
	0x2E,			/* No source address insertion, 8 byte preamble */
	0x00,			/* priority and backoff defaults */
	0x60,			/* interframe spacing */
	0x00,			/* slot time LSB */
	0xf2,			/* slot time and retries */
	0x00,			/* promiscuous mode */
	0x00,			/* collision detect */
	0x40,			/* minimum frame length */
	0xff,
	0x00,
	0x7f /*  *multi IA */ };

static int i596_open(struct net_device *dev);
static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t i596_interrupt(int irq, void *dev_id);
static int i596_close(struct net_device *dev);
static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
static void i596_tx_timeout (struct net_device *dev);
static void print_eth(unsigned char *buf, char *str);
static void set_multicast_list(struct net_device *dev);

static int rx_ring_size = RX_RING_SIZE;
static int ticks_limit = 25;
static int max_cmd_backlog = TX_RING_SIZE-1;


static inline void CA(struct net_device *dev)
{
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		((struct i596_reg *) dev->base_addr)->ca = 1;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile u32 i;

		i = *(volatile u32 *) (dev->base_addr);
	}
#endif
#ifdef ENABLE_APRICOT
	if (MACH_IS_APRICOT) {
		outw(0, (short) (dev->base_addr) + 4);
	}
#endif
}


static inline void MPU_PORT(struct net_device *dev, int c, volatile void *x)
{
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		struct i596_reg *p = (struct i596_reg *) (dev->base_addr);
		p->porthi = ((c) | (u32) (x)) & 0xffff;
		p->portlo = ((c) | (u32) (x)) >> 16;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		u32 v = (u32) (c) | (u32) (x);
		v = ((u32) (v) << 16) | ((u32) (v) >> 16);
		*(volatile u32 *) dev->base_addr = v;
		udelay(1);
		*(volatile u32 *) dev->base_addr = v;
	}
#endif
}


static inline int wait_istat(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
	while (--delcnt && lp->iscp.stat)
		udelay(10);
	if (!delcnt) {
		printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
		     dev->name, str, lp->scb.status, lp->scb.command);
		return -1;
	}
	else
		return 0;
}


static inline int wait_cmd(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
	while (--delcnt && lp->scb.command)
		udelay(10);
	if (!delcnt) {
		printk(KERN_ERR "%s: %s, status %4.4x, cmd %4.4x.\n",
		     dev->name, str, lp->scb.status, lp->scb.command);
		return -1;
	}
	else
		return 0;
}


static inline int wait_cfg(struct net_device *dev, struct i596_cmd *cmd, int delcnt, char *str)
{
	volatile struct i596_cmd *c = cmd;

	while (--delcnt && c->command)
		udelay(10);
	if (!delcnt) {
		printk(KERN_ERR "%s: %s.\n", dev->name, str);
		return -1;
	}
	else
		return 0;
}


static void i596_display_data(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	struct i596_cmd *cmd;
	struct i596_rfd *rfd;
	struct i596_rbd *rbd;

	printk(KERN_ERR "lp and scp at %p, .sysbus = %08lx, .iscp = %p\n",
	       &lp->scp, lp->scp.sysbus, lp->scp.iscp);
	printk(KERN_ERR "iscp at %p, iscp.stat = %08lx, .scb = %p\n",
	       &lp->iscp, lp->iscp.stat, lp->iscp.scb);
	printk(KERN_ERR "scb at %p, scb.status = %04x, .command = %04x,"
		" .cmd = %p, .rfd = %p\n",
	       &lp->scb, lp->scb.status, lp->scb.command,
		lp->scb.cmd, lp->scb.rfd);
	printk(KERN_ERR "   errors: crc %lx, align %lx, resource %lx,"
               " over %lx, rcvdt %lx, short %lx\n",
		lp->scb.crc_err, lp->scb.align_err, lp->scb.resource_err,
		lp->scb.over_err, lp->scb.rcvdt_err, lp->scb.short_err);
	cmd = lp->cmd_head;
	while (cmd != I596_NULL) {
		printk(KERN_ERR "cmd at %p, .status = %04x, .command = %04x, .b_next = %p\n",
		  cmd, cmd->status, cmd->command, cmd->b_next);
		cmd = cmd->v_next;
	}
	rfd = lp->rfd_head;
	printk(KERN_ERR "rfd_head = %p\n", rfd);
	do {
		printk(KERN_ERR "   %p .stat %04x, .cmd %04x, b_next %p, rbd %p,"
                        " count %04x\n",
			rfd, rfd->stat, rfd->cmd, rfd->b_next, rfd->rbd,
			rfd->count);
		rfd = rfd->v_next;
	} while (rfd != lp->rfd_head);
	rbd = lp->rbd_head;
	printk(KERN_ERR "rbd_head = %p\n", rbd);
	do {
		printk(KERN_ERR "   %p .count %04x, b_next %p, b_data %p, size %04x\n",
			rbd, rbd->count, rbd->b_next, rbd->b_data, rbd->size);
		rbd = rbd->v_next;
	} while (rbd != lp->rbd_head);
}


#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
static irqreturn_t i596_error(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		pcc2[0x28] = 1;
		pcc2[0x2b] = 0x1d;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 1;
		*ethirq = 3;
	}
#endif
	printk(KERN_ERR "%s: Error interrupt\n", dev->name);
	i596_display_data(dev);
	return IRQ_HANDLED;
}
#endif

static inline void init_rx_bufs(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	int i;
	struct i596_rfd *rfd;
	struct i596_rbd *rbd;

	/* First build the Receive Buffer Descriptor List */

	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
		struct sk_buff *skb = dev_alloc_skb(PKT_BUF_SZ);

		if (skb == NULL)
			panic("82596: alloc_skb() failed");
		skb->dev = dev;
		rbd->v_next = rbd+1;
		rbd->b_next = WSWAPrbd(virt_to_bus(rbd+1));
		rbd->b_addr = WSWAPrbd(virt_to_bus(rbd));
		rbd->skb = skb;
		rbd->v_data = skb->data;
		rbd->b_data = WSWAPchar(virt_to_bus(skb->data));
		rbd->size = PKT_BUF_SZ;
#ifdef __mc68000__
		cache_clear(virt_to_phys(skb->data), PKT_BUF_SZ);
#endif
	}
	lp->rbd_head = lp->rbds;
	rbd = lp->rbds + rx_ring_size - 1;
	rbd->v_next = lp->rbds;
	rbd->b_next = WSWAPrbd(virt_to_bus(lp->rbds));

	/* Now build the Receive Frame Descriptor List */

	for (i = 0, rfd = lp->rfds; i < rx_ring_size; i++, rfd++) {
		rfd->rbd = I596_NULL;
		rfd->v_next = rfd+1;
		rfd->v_prev = rfd-1;
		rfd->b_next = WSWAPrfd(virt_to_bus(rfd+1));
		rfd->cmd = CMD_FLEX;
	}
	lp->rfd_head = lp->rfds;
	lp->scb.rfd = WSWAPrfd(virt_to_bus(lp->rfds));
	rfd = lp->rfds;
	rfd->rbd = lp->rbd_head;
	rfd->v_prev = lp->rfds + rx_ring_size - 1;
	rfd = lp->rfds + rx_ring_size - 1;
	rfd->v_next = lp->rfds;
	rfd->b_next = WSWAPrfd(virt_to_bus(lp->rfds));
	rfd->cmd = CMD_EOL|CMD_FLEX;
}

static inline void remove_rx_bufs(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	struct i596_rbd *rbd;
	int i;

	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
		if (rbd->skb == NULL)
			break;
		dev_kfree_skb(rbd->skb);
	}
}


static void rebuild_rx_bufs(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	int i;

	/* Ensure rx frame/buffer descriptors are tidy */

	for (i = 0; i < rx_ring_size; i++) {
		lp->rfds[i].rbd = I596_NULL;
		lp->rfds[i].cmd = CMD_FLEX;
	}
	lp->rfds[rx_ring_size-1].cmd = CMD_EOL|CMD_FLEX;
	lp->rfd_head = lp->rfds;
	lp->scb.rfd = WSWAPrfd(virt_to_bus(lp->rfds));
	lp->rbd_head = lp->rbds;
	lp->rfds[0].rbd = WSWAPrbd(virt_to_bus(lp->rbds));
}


static int init_i596_mem(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
#if !defined(ENABLE_MVME16x_NET) && !defined(ENABLE_BVME6000_NET) || defined(ENABLE_APRICOT)
	short ioaddr = dev->base_addr;
#endif
	unsigned long flags;

	MPU_PORT(dev, PORT_RESET, NULL);

	udelay(100);		/* Wait 100us - seems to help */

#if defined(ENABLE_MVME16x_NET) || defined(ENABLE_BVME6000_NET)
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		/* Disable all ints for now */
		pcc2[0x28] = 1;
		pcc2[0x2a] = 0x48;
		/* Following disables snooping.  Snooping is not required
		 * as we make appropriate use of non-cached pages for
		 * shared data, and cache_push/cache_clear.
		 */
		pcc2[0x2b] = 0x08;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 1;
	}
#endif

	/* change the scp address */

	MPU_PORT(dev, PORT_ALTSCP, (void *)virt_to_bus((void *)&lp->scp));

#elif defined(ENABLE_APRICOT)

	{
		u32 scp = virt_to_bus(&lp->scp);

		/* change the scp address */
		outw(0, ioaddr);
		outw(0, ioaddr);
		outb(4, ioaddr + 0xf);
		outw(scp | 2, ioaddr);
		outw(scp >> 16, ioaddr);
	}
#endif

	lp->last_cmd = jiffies;

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x)
		lp->scp.sysbus = 0x00000054;
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000)
		lp->scp.sysbus = 0x0000004c;
#endif
#ifdef ENABLE_APRICOT
	if (MACH_IS_APRICOT)
		lp->scp.sysbus = 0x00440000;
#endif

	lp->scp.iscp = WSWAPiscp(virt_to_bus((void *)&lp->iscp));
	lp->iscp.scb = WSWAPscb(virt_to_bus((void *)&lp->scb));
	lp->iscp.stat = ISCP_BUSY;
	lp->cmd_backlog = 0;

	lp->cmd_head = lp->scb.cmd = I596_NULL;

#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		lp->scb.t_on  = 7 * 25;
		lp->scb.t_off = 1 * 25;
	}
#endif

	DEB(DEB_INIT,printk(KERN_DEBUG "%s: starting i82596.\n", dev->name));

#if defined(ENABLE_APRICOT)
	(void) inb(ioaddr + 0x10);
	outb(4, ioaddr + 0xf);
#endif
	CA(dev);

	if (wait_istat(dev,lp,1000,"initialization timed out"))
		goto failed;
	DEB(DEB_INIT,printk(KERN_DEBUG "%s: i82596 initialization successful\n", dev->name));

	/* Ensure rx frame/buffer descriptors are tidy */
	rebuild_rx_bufs(dev);
	lp->scb.command = 0;

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		/* Enable ints, etc. now */
		pcc2[0x2a] = 0x55;	/* Edge sensitive */
		pcc2[0x2b] = 0x15;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 3;
	}
#endif


	DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdConfigure\n", dev->name));
	memcpy(lp->cf_cmd.i596_config, init_setup, 14);
	lp->cf_cmd.cmd.command = CmdConfigure;
	i596_add_cmd(dev, &lp->cf_cmd.cmd);

	DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdSASetup\n", dev->name));
	memcpy(lp->sa_cmd.eth_addr, dev->dev_addr, 6);
	lp->sa_cmd.cmd.command = CmdSASetup;
	i596_add_cmd(dev, &lp->sa_cmd.cmd);

	DEB(DEB_INIT,printk(KERN_DEBUG "%s: queuing CmdTDR\n", dev->name));
	lp->tdr_cmd.cmd.command = CmdTDR;
	i596_add_cmd(dev, &lp->tdr_cmd.cmd);

	spin_lock_irqsave (&lp->lock, flags);

	if (wait_cmd(dev,lp,1000,"timed out waiting to issue RX_START")) {
		spin_unlock_irqrestore (&lp->lock, flags);
		goto failed;
	}
	DEB(DEB_INIT,printk(KERN_DEBUG "%s: Issuing RX_START\n", dev->name));
	lp->scb.command = RX_START;
	CA(dev);

	spin_unlock_irqrestore (&lp->lock, flags);

	if (wait_cmd(dev,lp,1000,"RX_START not processed"))
		goto failed;
	DEB(DEB_INIT,printk(KERN_DEBUG "%s: Receive unit started OK\n", dev->name));
	return 0;

failed:
	printk(KERN_CRIT "%s: Failed to initialise 82596\n", dev->name);
	MPU_PORT(dev, PORT_RESET, NULL);
	return -1;
}

static inline int i596_rx(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	struct i596_rfd *rfd;
	struct i596_rbd *rbd;
	int frames = 0;

	DEB(DEB_RXFRAME,printk(KERN_DEBUG "i596_rx(), rfd_head %p, rbd_head %p\n",
			lp->rfd_head, lp->rbd_head));

	rfd = lp->rfd_head;		/* Ref next frame to check */

	while ((rfd->stat) & STAT_C) {	/* Loop while complete frames */
		if (rfd->rbd == I596_NULL)
			rbd = I596_NULL;
		else if (rfd->rbd == lp->rbd_head->b_addr)
			rbd = lp->rbd_head;
		else {
			printk(KERN_CRIT "%s: rbd chain broken!\n", dev->name);
			/* XXX Now what? */
			rbd = I596_NULL;
		}
		DEB(DEB_RXFRAME, printk(KERN_DEBUG "  rfd %p, rfd.rbd %p, rfd.stat %04x\n",
			rfd, rfd->rbd, rfd->stat));

		if (rbd != I596_NULL && ((rfd->stat) & STAT_OK)) {
			/* a good frame */
			int pkt_len = rbd->count & 0x3fff;
			struct sk_buff *skb = rbd->skb;
			int rx_in_place = 0;

			DEB(DEB_RXADDR,print_eth(rbd->v_data, "received"));
			frames++;

			/* Check if the packet is long enough to just accept
			 * without copying to a properly sized skbuff.
			 */

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

				/* Get fresh skbuff to replace filled one. */
				newskb = dev_alloc_skb(PKT_BUF_SZ);
				if (newskb == NULL) {
					skb = NULL;	/* drop pkt */
					goto memory_squeeze;
				}
				/* Pass up the skb already on the Rx ring. */
				skb_put(skb, pkt_len);
				rx_in_place = 1;
				rbd->skb = newskb;
				newskb->dev = dev;
				rbd->v_data = newskb->data;
				rbd->b_data = WSWAPchar(virt_to_bus(newskb->data));
#ifdef __mc68000__
				cache_clear(virt_to_phys(newskb->data), PKT_BUF_SZ);
#endif
			}
			else
				skb = dev_alloc_skb(pkt_len + 2);
memory_squeeze:
			if (skb == NULL) {
				/* XXX tulip.c can defer packets here!! */
				printk(KERN_WARNING "%s: i596_rx Memory squeeze, dropping packet.\n", dev->name);
				dev->stats.rx_dropped++;
			}
			else {
				if (!rx_in_place) {
					/* 16 byte align the data fields */
					skb_reserve(skb, 2);
					memcpy(skb_put(skb,pkt_len), rbd->v_data, pkt_len);
				}
				skb->protocol=eth_type_trans(skb,dev);
				skb->len = pkt_len;
#ifdef __mc68000__
				cache_clear(virt_to_phys(rbd->skb->data),
						pkt_len);
#endif
				netif_rx(skb);
				dev->stats.rx_packets++;
				dev->stats.rx_bytes+=pkt_len;
			}
		}
		else {
			DEB(DEB_ERRORS, printk(KERN_DEBUG "%s: Error, rfd.stat = 0x%04x\n",
					dev->name, rfd->stat));
			dev->stats.rx_errors++;
			if ((rfd->stat) & 0x0001)
				dev->stats.collisions++;
			if ((rfd->stat) & 0x0080)
				dev->stats.rx_length_errors++;
			if ((rfd->stat) & 0x0100)
				dev->stats.rx_over_errors++;
			if ((rfd->stat) & 0x0200)
				dev->stats.rx_fifo_errors++;
			if ((rfd->stat) & 0x0400)
				dev->stats.rx_frame_errors++;
			if ((rfd->stat) & 0x0800)
				dev->stats.rx_crc_errors++;
			if ((rfd->stat) & 0x1000)
				dev->stats.rx_length_errors++;
		}

		/* Clear the buffer descriptor count and EOF + F flags */

		if (rbd != I596_NULL && (rbd->count & 0x4000)) {
			rbd->count = 0;
			lp->rbd_head = rbd->v_next;
		}

		/* Tidy the frame descriptor, marking it as end of list */

		rfd->rbd = I596_NULL;
		rfd->stat = 0;
		rfd->cmd = CMD_EOL|CMD_FLEX;
		rfd->count = 0;

		/* Remove end-of-list from old end descriptor */

		rfd->v_prev->cmd = CMD_FLEX;

		/* Update record of next frame descriptor to process */

		lp->scb.rfd = rfd->b_next;
		lp->rfd_head = rfd->v_next;
		rfd = lp->rfd_head;
	}

	DEB(DEB_RXFRAME,printk(KERN_DEBUG "frames %d\n", frames));

	return 0;
}


static void i596_cleanup_cmd(struct net_device *dev, struct i596_private *lp)
{
	struct i596_cmd *ptr;

	while (lp->cmd_head != I596_NULL) {
		ptr = lp->cmd_head;
		lp->cmd_head = ptr->v_next;
		lp->cmd_backlog--;

		switch ((ptr->command) & 0x7) {
		case CmdTx:
			{
				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
				struct sk_buff *skb = tx_cmd->skb;

				dev_kfree_skb(skb);

				dev->stats.tx_errors++;
				dev->stats.tx_aborted_errors++;

				ptr->v_next = ptr->b_next = I596_NULL;
				tx_cmd->cmd.command = 0;  /* Mark as free */
				break;
			}
		default:
			ptr->v_next = ptr->b_next = I596_NULL;
		}
	}

	wait_cmd(dev,lp,100,"i596_cleanup_cmd timed out");
	lp->scb.cmd = I596_NULL;
}

static void i596_reset(struct net_device *dev, struct i596_private *lp,
			int ioaddr)
{
	unsigned long flags;

	DEB(DEB_RESET,printk(KERN_DEBUG "i596_reset\n"));

	spin_lock_irqsave (&lp->lock, flags);

	wait_cmd(dev,lp,100,"i596_reset timed out");

	netif_stop_queue(dev);

	lp->scb.command = CUC_ABORT | RX_ABORT;
	CA(dev);

	/* wait for shutdown */
	wait_cmd(dev,lp,1000,"i596_reset 2 timed out");
	spin_unlock_irqrestore (&lp->lock, flags);

	i596_cleanup_cmd(dev,lp);
	i596_rx(dev);

	netif_start_queue(dev);
	init_i596_mem(dev);
}

static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd)
{
	struct i596_private *lp = dev->ml_priv;
	int ioaddr = dev->base_addr;
	unsigned long flags;

	DEB(DEB_ADDCMD,printk(KERN_DEBUG "i596_add_cmd\n"));

	cmd->status = 0;
	cmd->command |= (CMD_EOL | CMD_INTR);
	cmd->v_next = cmd->b_next = I596_NULL;

	spin_lock_irqsave (&lp->lock, flags);

	if (lp->cmd_head != I596_NULL) {
		lp->cmd_tail->v_next = cmd;
		lp->cmd_tail->b_next = WSWAPcmd(virt_to_bus(&cmd->status));
	} else {
		lp->cmd_head = cmd;
		wait_cmd(dev,lp,100,"i596_add_cmd timed out");
		lp->scb.cmd = WSWAPcmd(virt_to_bus(&cmd->status));
		lp->scb.command = CUC_START;
		CA(dev);
	}
	lp->cmd_tail = cmd;
	lp->cmd_backlog++;

	spin_unlock_irqrestore (&lp->lock, flags);

	if (lp->cmd_backlog > max_cmd_backlog) {
		unsigned long tickssofar = jiffies - lp->last_cmd;

		if (tickssofar < ticks_limit)
			return;

		printk(KERN_NOTICE "%s: command unit timed out, status resetting.\n", dev->name);

		i596_reset(dev, lp, ioaddr);
	}
}

static int i596_open(struct net_device *dev)
{
	int res = 0;

	DEB(DEB_OPEN,printk(KERN_DEBUG "%s: i596_open() irq %d.\n", dev->name, dev->irq));

	if (request_irq(dev->irq, i596_interrupt, 0, "i82596", dev)) {
		printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
		return -EAGAIN;
	}
#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		if (request_irq(0x56, i596_error, 0, "i82596_error", dev))
			return -EAGAIN;
	}
#endif
	init_rx_bufs(dev);

	netif_start_queue(dev);

	/* Initialize the 82596 memory */
	if (init_i596_mem(dev)) {
		res = -EAGAIN;
		free_irq(dev->irq, dev);
	}

	return res;
}

static void i596_tx_timeout (struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	int ioaddr = dev->base_addr;

	/* Transmitter timeout, serious problems. */
	DEB(DEB_ERRORS,printk(KERN_ERR "%s: transmit timed out, status resetting.\n",
			dev->name));

	dev->stats.tx_errors++;

	/* Try to restart the adaptor */
	if (lp->last_restart == dev->stats.tx_packets) {
		DEB(DEB_ERRORS,printk(KERN_ERR "Resetting board.\n"));
		/* Shutdown and restart */
		i596_reset (dev, lp, ioaddr);
	} else {
		/* Issue a channel attention signal */
		DEB(DEB_ERRORS,printk(KERN_ERR "Kicking board.\n"));
		lp->scb.command = CUC_START | RX_START;
		CA (dev);
		lp->last_restart = dev->stats.tx_packets;
	}

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

static netdev_tx_t i596_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	struct tx_cmd *tx_cmd;
	struct i596_tbd *tbd;
	short length = skb->len;
	dev->trans_start = jiffies;

	DEB(DEB_STARTTX,printk(KERN_DEBUG "%s: i596_start_xmit(%x,%p) called\n",
				dev->name, skb->len, skb->data));

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

	tx_cmd = lp->tx_cmds + lp->next_tx_cmd;
	tbd = lp->tbds + lp->next_tx_cmd;

	if (tx_cmd->cmd.command) {
		printk(KERN_NOTICE "%s: xmit ring full, dropping packet.\n",
				dev->name);
		dev->stats.tx_dropped++;

		dev_kfree_skb(skb);
	} else {
		if (++lp->next_tx_cmd == TX_RING_SIZE)
			lp->next_tx_cmd = 0;
		tx_cmd->tbd = WSWAPtbd(virt_to_bus(tbd));
		tbd->next = I596_NULL;

		tx_cmd->cmd.command = CMD_FLEX | CmdTx;
		tx_cmd->skb = skb;

		tx_cmd->pad = 0;
		tx_cmd->size = 0;
		tbd->pad = 0;
		tbd->size = EOF | length;

		tbd->data = WSWAPchar(virt_to_bus(skb->data));

#ifdef __mc68000__
		cache_push(virt_to_phys(skb->data), length);
#endif
		DEB(DEB_TXADDR,print_eth(skb->data, "tx-queued"));
		i596_add_cmd(dev, &tx_cmd->cmd);

		dev->stats.tx_packets++;
		dev->stats.tx_bytes += length;
	}

	netif_start_queue(dev);

	return NETDEV_TX_OK;
}

static void print_eth(unsigned char *add, char *str)
{
	printk(KERN_DEBUG "i596 0x%p, %pM --> %pM %02X%02X, %s\n",
	       add, add + 6, add, add[12], add[13], str);
}

static int io = 0x300;
static int irq = 10;

static const struct net_device_ops i596_netdev_ops = {
	.ndo_open 		= i596_open,
	.ndo_stop		= i596_close,
	.ndo_start_xmit		= i596_start_xmit,
	.ndo_set_multicast_list = set_multicast_list,
	.ndo_tx_timeout		= i596_tx_timeout,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

struct net_device * __init i82596_probe(int unit)
{
	struct net_device *dev;
	int i;
	struct i596_private *lp;
	char eth_addr[8];
	static int probed;
	int err;

	if (probed)
		return ERR_PTR(-ENODEV);
	probed++;

	dev = alloc_etherdev(0);
	if (!dev)
		return ERR_PTR(-ENOMEM);

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

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		if (mvme16x_config & MVME16x_CONFIG_NO_ETHERNET) {
			printk(KERN_NOTICE "Ethernet probe disabled - chip not present\n");
			err = -ENODEV;
			goto out;
		}
		memcpy(eth_addr, (void *) 0xfffc1f2c, 6);	/* YUCK! Get addr from NOVRAM */
		dev->base_addr = MVME_I596_BASE;
		dev->irq = (unsigned) MVME16x_IRQ_I596;
		goto found;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *rtc = (unsigned char *) BVME_RTC_BASE;
		unsigned char msr = rtc[3];
		int i;

		rtc[3] |= 0x80;
		for (i = 0; i < 6; i++)
			eth_addr[i] = rtc[i * 4 + 7];	/* Stored in RTC RAM at offset 1 */
		rtc[3] = msr;
		dev->base_addr = BVME_I596_BASE;
		dev->irq = (unsigned) BVME_IRQ_I596;
		goto found;
	}
#endif
#ifdef ENABLE_APRICOT
	{
		int checksum = 0;
		int ioaddr = 0x300;

		/* this is easy the ethernet interface can only be at 0x300 */
		/* first check nothing is already registered here */

		if (!request_region(ioaddr, I596_TOTAL_SIZE, DRV_NAME)) {
			printk(KERN_ERR "82596: IO address 0x%04x in use\n", ioaddr);
			err = -EBUSY;
			goto out;
		}

		dev->base_addr = ioaddr;

		for (i = 0; i < 8; i++) {
			eth_addr[i] = inb(ioaddr + 8 + i);
			checksum += eth_addr[i];
		}

		/* checksum is a multiple of 0x100, got this wrong first time
		   some machines have 0x100, some 0x200. The DOS driver doesn't
		   even bother with the checksum.
		   Some other boards trip the checksum.. but then appear as
		   ether address 0. Trap these - AC */

		if ((checksum % 0x100) ||
		    (memcmp(eth_addr, "\x00\x00\x49", 3) != 0)) {
			err = -ENODEV;
			goto out1;
		}

		dev->irq = 10;
		goto found;
	}
#endif
	err = -ENODEV;
	goto out;

found:
	dev->mem_start = (int)__get_free_pages(GFP_ATOMIC, 0);
	if (!dev->mem_start) {
		err = -ENOMEM;
		goto out1;
	}

	DEB(DEB_PROBE,printk(KERN_INFO "%s: 82596 at %#3lx,", dev->name, dev->base_addr));

	for (i = 0; i < 6; i++)
		DEB(DEB_PROBE,printk(" %2.2X", dev->dev_addr[i] = eth_addr[i]));

	DEB(DEB_PROBE,printk(" IRQ %d.\n", dev->irq));

	DEB(DEB_PROBE,printk(KERN_INFO "%s", version));

	/* The 82596-specific entries in the device structure. */
	dev->netdev_ops = &i596_netdev_ops;
	dev->watchdog_timeo = TX_TIMEOUT;

	dev->ml_priv = (void *)(dev->mem_start);

	lp = dev->ml_priv;
	DEB(DEB_INIT,printk(KERN_DEBUG "%s: lp at 0x%08lx (%zd bytes), "
			"lp->scb at 0x%08lx\n",
			dev->name, (unsigned long)lp,
			sizeof(struct i596_private), (unsigned long)&lp->scb));
	memset((void *) lp, 0, sizeof(struct i596_private));

#ifdef __mc68000__
	cache_push(virt_to_phys((void *)(dev->mem_start)), 4096);
	cache_clear(virt_to_phys((void *)(dev->mem_start)), 4096);
	kernel_set_cachemode((void *)(dev->mem_start), 4096, IOMAP_NOCACHE_SER);
#endif
	lp->scb.command = 0;
	lp->scb.cmd = I596_NULL;
	lp->scb.rfd = I596_NULL;
	spin_lock_init(&lp->lock);

	err = register_netdev(dev);
	if (err)
		goto out2;
	return dev;
out2:
#ifdef __mc68000__
	/* XXX This assumes default cache mode to be IOMAP_FULL_CACHING,
	 * XXX which may be invalid (CONFIG_060_WRITETHROUGH)
	 */
	kernel_set_cachemode((void *)(dev->mem_start), 4096,
			IOMAP_FULL_CACHING);
#endif
	free_page ((u32)(dev->mem_start));
out1:
#ifdef ENABLE_APRICOT
	release_region(dev->base_addr, I596_TOTAL_SIZE);
#endif
out:
	free_netdev(dev);
	return ERR_PTR(err);
}

static irqreturn_t i596_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct i596_private *lp;
	short ioaddr;
	unsigned short status, ack_cmd = 0;
	int handled = 0;

#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		if (*(char *) BVME_LOCAL_IRQ_STAT & BVME_ETHERR) {
			i596_error(irq, dev_id);
			return IRQ_HANDLED;
		}
	}
#endif
	if (dev == NULL) {
		printk(KERN_ERR "i596_interrupt(): irq %d for unknown device.\n", irq);
		return IRQ_NONE;
	}

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

	spin_lock (&lp->lock);

	wait_cmd(dev,lp,100,"i596 interrupt, timeout");
	status = lp->scb.status;

	DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt, IRQ %d, status %4.4x.\n",
			dev->name, irq, status));

	ack_cmd = status & 0xf000;

	if ((status & 0x8000) || (status & 0x2000)) {
		struct i596_cmd *ptr;

		handled = 1;
		if ((status & 0x8000))
			DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt completed command.\n", dev->name));
		if ((status & 0x2000))
			DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt command unit inactive %x.\n", dev->name, status & 0x0700));

		while ((lp->cmd_head != I596_NULL) && (lp->cmd_head->status & STAT_C)) {
			ptr = lp->cmd_head;

			DEB(DEB_STATUS,printk(KERN_DEBUG "cmd_head->status = %04x, ->command = %04x\n",
				       lp->cmd_head->status, lp->cmd_head->command));
			lp->cmd_head = ptr->v_next;
			lp->cmd_backlog--;

			switch ((ptr->command) & 0x7) {
			case CmdTx:
			    {
				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
				struct sk_buff *skb = tx_cmd->skb;

				if ((ptr->status) & STAT_OK) {
					DEB(DEB_TXADDR,print_eth(skb->data, "tx-done"));
				} else {
					dev->stats.tx_errors++;
					if ((ptr->status) & 0x0020)
						dev->stats.collisions++;
					if (!((ptr->status) & 0x0040))
						dev->stats.tx_heartbeat_errors++;
					if ((ptr->status) & 0x0400)
						dev->stats.tx_carrier_errors++;
					if ((ptr->status) & 0x0800)
						dev->stats.collisions++;
					if ((ptr->status) & 0x1000)
						dev->stats.tx_aborted_errors++;
				}

				dev_kfree_skb_irq(skb);

				tx_cmd->cmd.command = 0; /* Mark free */
				break;
			    }
			case CmdTDR:
			    {
				unsigned short status = ((struct tdr_cmd *)ptr)->status;

				if (status & 0x8000) {
					DEB(DEB_TDR,printk(KERN_INFO "%s: link ok.\n", dev->name));
				} else {
					if (status & 0x4000)
						printk(KERN_ERR "%s: Transceiver problem.\n", dev->name);
					if (status & 0x2000)
						printk(KERN_ERR "%s: Termination problem.\n", dev->name);
					if (status & 0x1000)
						printk(KERN_ERR "%s: Short circuit.\n", dev->name);

					DEB(DEB_TDR,printk(KERN_INFO "%s: Time %d.\n", dev->name, status & 0x07ff));
				}
				break;
			    }
			case CmdConfigure:
			case CmdMulticastList:
				/* Zap command so set_multicast_list() knows it is free */
				ptr->command = 0;
				break;
			}
			ptr->v_next = ptr->b_next = I596_NULL;
			lp->last_cmd = jiffies;
		}

		ptr = lp->cmd_head;
		while ((ptr != I596_NULL) && (ptr != lp->cmd_tail)) {
			ptr->command &= 0x1fff;
			ptr = ptr->v_next;
		}

		if ((lp->cmd_head != I596_NULL))
			ack_cmd |= CUC_START;
		lp->scb.cmd = WSWAPcmd(virt_to_bus(&lp->cmd_head->status));
	}
	if ((status & 0x1000) || (status & 0x4000)) {
		if ((status & 0x4000))
			DEB(DEB_INTS,printk(KERN_DEBUG "%s: i596 interrupt received a frame.\n", dev->name));
		i596_rx(dev);
		/* Only RX_START if stopped - RGH 07-07-96 */
		if (status & 0x1000) {
			if (netif_running(dev)) {
				DEB(DEB_ERRORS,printk(KERN_ERR "%s: i596 interrupt receive unit inactive, status 0x%x\n", dev->name, status));
				ack_cmd |= RX_START;
				dev->stats.rx_errors++;
				dev->stats.rx_fifo_errors++;
				rebuild_rx_bufs(dev);
			}
		}
	}
	wait_cmd(dev,lp,100,"i596 interrupt, timeout");
	lp->scb.command = ack_cmd;

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		/* Ack the interrupt */

		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		pcc2[0x2a] |= 0x08;
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 1;
		*ethirq = 3;
	}
#endif
#ifdef ENABLE_APRICOT
	(void) inb(ioaddr + 0x10);
	outb(4, ioaddr + 0xf);
#endif
	CA(dev);

	DEB(DEB_INTS,printk(KERN_DEBUG "%s: exiting interrupt.\n", dev->name));

	spin_unlock (&lp->lock);
	return IRQ_RETVAL(handled);
}

static int i596_close(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	unsigned long flags;

	netif_stop_queue(dev);

	DEB(DEB_INIT,printk(KERN_DEBUG "%s: Shutting down ethercard, status was %4.4x.\n",
		       dev->name, lp->scb.status));

	spin_lock_irqsave(&lp->lock, flags);

	wait_cmd(dev,lp,100,"close1 timed out");
	lp->scb.command = CUC_ABORT | RX_ABORT;
	CA(dev);

	wait_cmd(dev,lp,100,"close2 timed out");

	spin_unlock_irqrestore(&lp->lock, flags);
	DEB(DEB_STRUCT,i596_display_data(dev));
	i596_cleanup_cmd(dev,lp);

#ifdef ENABLE_MVME16x_NET
	if (MACH_IS_MVME16x) {
		volatile unsigned char *pcc2 = (unsigned char *) 0xfff42000;

		/* Disable all ints */
		pcc2[0x28] = 1;
		pcc2[0x2a] = 0x40;
		pcc2[0x2b] = 0x40;	/* Set snooping bits now! */
	}
#endif
#ifdef ENABLE_BVME6000_NET
	if (MACH_IS_BVME6000) {
		volatile unsigned char *ethirq = (unsigned char *) BVME_ETHIRQ_REG;

		*ethirq = 1;
	}
#endif

	free_irq(dev->irq, dev);
	remove_rx_bufs(dev);

	return 0;
}

/*
 *    Set or clear the multicast filter for this adaptor.
 */

static void set_multicast_list(struct net_device *dev)
{
	struct i596_private *lp = dev->ml_priv;
	int config = 0, cnt;

	DEB(DEB_MULTI,printk(KERN_DEBUG "%s: set multicast list, %d entries, promisc %s, allmulti %s\n",
		dev->name, netdev_mc_count(dev),
		dev->flags & IFF_PROMISC  ? "ON" : "OFF",
		dev->flags & IFF_ALLMULTI ? "ON" : "OFF"));

	if (wait_cfg(dev, &lp->cf_cmd.cmd, 1000, "config change request timed out"))
		return;

	if ((dev->flags & IFF_PROMISC) && !(lp->cf_cmd.i596_config[8] & 0x01)) {
		lp->cf_cmd.i596_config[8] |= 0x01;
		config = 1;
	}
	if (!(dev->flags & IFF_PROMISC) && (lp->cf_cmd.i596_config[8] & 0x01)) {
		lp->cf_cmd.i596_config[8] &= ~0x01;
		config = 1;
	}
	if ((dev->flags & IFF_ALLMULTI) && (lp->cf_cmd.i596_config[11] & 0x20)) {
		lp->cf_cmd.i596_config[11] &= ~0x20;
		config = 1;
	}
	if (!(dev->flags & IFF_ALLMULTI) && !(lp->cf_cmd.i596_config[11] & 0x20)) {
		lp->cf_cmd.i596_config[11] |= 0x20;
		config = 1;
	}
	if (config) {
		lp->cf_cmd.cmd.command = CmdConfigure;
		i596_add_cmd(dev, &lp->cf_cmd.cmd);
	}

	cnt = netdev_mc_count(dev);
	if (cnt > MAX_MC_CNT)
	{
		cnt = MAX_MC_CNT;
		printk(KERN_ERR "%s: Only %d multicast addresses supported",
			dev->name, cnt);
	}

	if (!netdev_mc_empty(dev)) {
		struct dev_mc_list *dmi;
		unsigned char *cp;
		struct mc_cmd *cmd;

		if (wait_cfg(dev, &lp->mc_cmd.cmd, 1000, "multicast list change request timed out"))
			return;
		cmd = &lp->mc_cmd;
		cmd->cmd.command = CmdMulticastList;
		cmd->mc_cnt = cnt * ETH_ALEN;
		cp = cmd->mc_addrs;
		netdev_for_each_mc_addr(dmi, dev) {
			if (!cnt--)
				break;
			memcpy(cp, dmi->dmi_addr, ETH_ALEN);
			if (i596_debug > 1)
				DEB(DEB_MULTI,printk(KERN_INFO "%s: Adding address %pM\n",
						dev->name, cp));
			cp += ETH_ALEN;
		}
		i596_add_cmd(dev, &cmd->cmd);
	}
}

#ifdef MODULE
static struct net_device *dev_82596;

#ifdef ENABLE_APRICOT
module_param(irq, int, 0);
MODULE_PARM_DESC(irq, "Apricot IRQ number");
#endif

static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "i82596 debug mask");

int __init init_module(void)
{
	if (debug >= 0)
		i596_debug = debug;
	dev_82596 = i82596_probe(-1);
	if (IS_ERR(dev_82596))
		return PTR_ERR(dev_82596);
	return 0;
}

void __exit cleanup_module(void)
{
	unregister_netdev(dev_82596);
#ifdef __mc68000__
	/* XXX This assumes default cache mode to be IOMAP_FULL_CACHING,
	 * XXX which may be invalid (CONFIG_060_WRITETHROUGH)
	 */

	kernel_set_cachemode((void *)(dev_82596->mem_start), 4096,
			IOMAP_FULL_CACHING);
#endif
	free_page ((u32)(dev_82596->mem_start));
#ifdef ENABLE_APRICOT
	/* If we don't do this, we can't re-insmod it later. */
	release_region(dev_82596->base_addr, I596_TOTAL_SIZE);
#endif
	free_netdev(dev_82596);
}

#endif				/* MODULE */