aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/lp486e.c
blob: 3df046a58b1d484c11625e984b1a8b5b0420c327 (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
/* Intel Professional Workstation/panther ethernet driver */
/* lp486e.c: A panther 82596 ethernet driver for linux. */
/*
    History and copyrights:

    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

    Apricot
        Written 1994 by Mark Evans.
        This driver is for the Apricot 82596 bus-master interface

        Modularised 12/94 Mark Evans

    Professional Workstation
	Derived from apricot.c by Ard van Breemen
	<ard@murphy.nl>|<ard@cstmel.hobby.nl>|<ard@cstmel.nl.eu.org>

	Credits:
	Thanks to Murphy Software BV for letting me write this in their time.
	Well, actually, I get payed doing this...
	(Also: see http://www.murphy.nl for murphy, and my homepage ~ard for
	more information on the Professional Workstation)

    Present version
	aeb@cwi.nl
*/
/*
    There are currently two motherboards that I know of in the
    professional workstation. The only one that I know is the
    intel panther motherboard. -- ard
*/
/*
The pws is equipped with an intel 82596. This is a very intelligent controller
which runs its own micro-code. Communication with the hostprocessor is done
through linked lists of commands and buffers in the hostprocessors memory.
A complete description of the 82596 is available from intel. Search for
a file called "29021806.pdf". It is a complete description of the chip itself.
To use it for the pws some additions are needed regarding generation of
the PORT and CA signal, and the interrupt glue needed for a pc.
I/O map:
PORT  SIZE ACTION MEANING
0xCB0    2 WRITE  Lower 16 bits for PORT command
0xCB2    2 WRITE  Upper 16 bits for PORT command, and issue of PORT command
0xCB4    1 WRITE  Generation of CA signal
0xCB8    1 WRITE  Clear interrupt glue
All other communication is through memory!
*/

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

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

#define DRV_NAME "lp486e"

/* debug print flags */
#define LOG_SRCDST    0x80000000
#define LOG_STATINT   0x40000000
#define LOG_STARTINT  0x20000000

#define i596_debug debug

static int i596_debug = 0;

static const char * const medianame[] = {
	"10baseT", "AUI",
	"10baseT-FD", "AUI-FD",
};

#define LP486E_TOTAL_SIZE 16

#define I596_NULL (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,
	CmdIASetup = 1,
	CmdConfigure = 2,
	CmdMulticastList = 3,
	CmdTx = 4,
	CmdTDR = 5,
	CmdDump = 6,
	CmdDiagnose = 7
};

#if 0
static const char *CUcmdnames[8] = { "NOP", "IASetup", "Configure", "MulticastList",
				     "Tx", "TDR", "Dump", "Diagnose" };
#endif

/* Status word bits */
#define	STAT_CX		0x8000	/* The CU finished executing a command
				   with the Interrupt bit set */
#define	STAT_FR		0x4000	/* The RU finished receiving a frame */
#define	STAT_CNA	0x2000	/* The CU left the active state */
#define	STAT_RNR	0x1000	/* The RU left the active state */
#define STAT_ACK	(STAT_CX | STAT_FR | STAT_CNA | STAT_RNR)
#define	STAT_CUS	0x0700	/* Status of CU: 0: idle, 1: suspended,
				   2: active, 3-7: unused */
#define STAT_RUS	0x00f0	/* Status of RU: 0: idle, 1: suspended,
				   2: no resources, 4: ready,
				   10: no resources due to no more RBDs,
				   12: no more RBDs, other: unused */
#define	STAT_T		0x0008	/* Bus throttle timers loaded */
#define	STAT_ZERO	0x0807	/* Always zero */

#if 0
static char *CUstates[8] = {
	"idle", "suspended", "active", 0, 0, 0, 0, 0
};
static char *RUstates[16] = {
	"idle", "suspended", "no resources", 0, "ready", 0, 0, 0,
	0, 0, "no RBDs", 0, "out of RBDs", 0, 0, 0
};

static void
i596_out_status(int status) {
	int bad = 0;
	char *s;

	printk("status %4.4x:", status);
	if (status == 0xffff)
		printk(" strange..\n");
	else {
		if (status & STAT_CX)
			printk("  CU done");
		if (status & STAT_CNA)
			printk("  CU stopped");
		if (status & STAT_FR)
			printk("  got a frame");
		if (status & STAT_RNR)
			printk("  RU stopped");
		if (status & STAT_T)
			printk("  throttled");
		if (status & STAT_ZERO)
			bad = 1;
		s = CUstates[(status & STAT_CUS) >> 8];
		if (!s)
			bad = 1;
		else
			printk("  CU(%s)", s);
		s = RUstates[(status & STAT_RUS) >> 4];
		if (!s)
			bad = 1;
		else
			printk("  RU(%s)", s);
		if (bad)
			printk("  bad status");
		printk("\n");
	}
}
#endif

/* Command word bits */
#define ACK_CX		0x8000
#define ACK_FR		0x4000
#define ACK_CNA		0x2000
#define ACK_RNR		0x1000

#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

typedef u32 phys_addr;

static inline phys_addr
va_to_pa(void *x) {
	return x ? virt_to_bus(x) : I596_NULL;
}

static inline void *
pa_to_va(phys_addr x) {
	return (x == I596_NULL) ? NULL : bus_to_virt(x);
}

/* status bits for cmd */
#define CMD_STAT_C	0x8000	/* CU command complete */
#define CMD_STAT_B	0x4000	/* CU command in progress */
#define CMD_STAT_OK	0x2000	/* CU command completed without errors */
#define CMD_STAT_A	0x1000	/* CU command abnormally terminated */

struct i596_cmd {		/* 8 bytes */
	unsigned short status;
	unsigned short command;
	phys_addr pa_next;	/* va_to_pa(struct i596_cmd *next) */
};

#define EOF		0x8000
#define SIZE_MASK	0x3fff

struct i596_tbd {
	unsigned short size;
	unsigned short pad;
	phys_addr pa_next;	/* va_to_pa(struct i596_tbd *next) */
	phys_addr pa_data;	/* va_to_pa(char *data) */
	struct sk_buff *skb;
};

struct tx_cmd {
	struct i596_cmd cmd;
	phys_addr pa_tbd;	/* va_to_pa(struct i596_tbd *tbd) */
	unsigned short size;
	unsigned short pad;
};

/* status bits for rfd */
#define RFD_STAT_C	0x8000	/* Frame reception complete */
#define RFD_STAT_B	0x4000	/* Frame reception in progress */
#define RFD_STAT_OK	0x2000	/* Frame received without errors */
#define RFD_STATUS	0x1fff
#define RFD_LENGTH_ERR	0x1000
#define RFD_CRC_ERR	0x0800
#define RFD_ALIGN_ERR	0x0400
#define RFD_NOBUFS_ERR	0x0200
#define RFD_DMA_ERR	0x0100	/* DMA overrun failure to acquire system bus */
#define RFD_SHORT_FRAME_ERR	0x0080
#define RFD_NOEOP_ERR	0x0040
#define RFD_TRUNC_ERR	0x0020
#define RFD_MULTICAST  0x0002	/* 0: destination had our address
				   1: destination was broadcast/multicast */
#define RFD_COLLISION  0x0001

/* receive frame descriptor */
struct i596_rfd {
	unsigned short stat;
	unsigned short cmd;
	phys_addr pa_next;	/* va_to_pa(struct i596_rfd *next) */
	phys_addr pa_rbd;	/* va_to_pa(struct i596_rbd *rbd) */
	unsigned short count;
	unsigned short size;
	char data[1532];
};

#define RBD_EL		0x8000
#define RBD_P		0x4000
#define RBD_SIZEMASK	0x3fff
#define RBD_EOF		0x8000
#define RBD_F		0x4000

/* receive buffer descriptor */
struct i596_rbd {
	unsigned short size;
	unsigned short pad;
	phys_addr pa_next;	/* va_to_pa(struct i596_tbd *next) */
	phys_addr pa_data;	/* va_to_pa(char *data) */
	phys_addr pa_prev;	/* va_to_pa(struct i596_tbd *prev) */

	/* Driver private part */
	struct sk_buff *skb;
};

#define RX_RING_SIZE 64
#define RX_SKBSIZE (ETH_FRAME_LEN+10)
#define RX_RBD_SIZE 32

/* System Control Block - 40 bytes */
struct i596_scb {
	u16 status;		/* 0 */
	u16 command;		/* 2 */
	phys_addr pa_cmd;	/* 4 - va_to_pa(struct i596_cmd *cmd) */
	phys_addr pa_rfd;	/* 8 - va_to_pa(struct i596_rfd *rfd) */
	u32 crc_err;		/* 12 */
	u32 align_err;		/* 16 */
	u32 resource_err;	/* 20 */
	u32 over_err;		/* 24 */
	u32 rcvdt_err;		/* 28 */
	u32 short_err;		/* 32 */
	u16 t_on;		/* 36 */
	u16 t_off;		/* 38 */
};

/* Intermediate System Configuration Pointer - 8 bytes */
struct i596_iscp {
	u32 busy;		/* 0 */
	phys_addr pa_scb;	/* 4 - va_to_pa(struct i596_scb *scb) */
};

/* System Configuration Pointer - 12 bytes */
struct i596_scp {
	u32 sysbus;		/* 0 */
	u32 pad;		/* 4 */
	phys_addr pa_iscp;	/* 8 - va_to_pa(struct i596_iscp *iscp) */
};

/* Selftest and dump results - needs 16-byte alignment */
/*
 * The size of the dump area is 304 bytes. When the dump is executed
 * by the Port command an extra word will be appended to the dump area.
 * The extra word is a copy of the Dump status word (containing the
 * C, B, OK bits). [I find 0xa006, with a0 for C+OK and 6 for dump]
 */
struct i596_dump {
	u16 dump[153];		/* (304 = 130h) + 2 bytes */
};

struct i596_private {		/* aligned to a 16-byte boundary */
	struct i596_scp scp;	/* 0 - needs 16-byte alignment */
	struct i596_iscp iscp;	/* 12 */
	struct i596_scb scb;	/* 20 */
	u32 dummy;		/* 60 */
	struct i596_dump dump;	/* 64 - needs 16-byte alignment */

	struct i596_cmd set_add;
	char eth_addr[8];	/* directly follows set_add */

	struct i596_cmd set_conf;
	char i596_config[16];	/* directly follows set_conf */

	struct i596_cmd tdr;
	unsigned long tdr_stat;	/* directly follows tdr */

	int last_restart;
	struct i596_rbd *rbd_list;
	struct i596_rbd *rbd_tail;
	struct i596_rfd *rx_tail;
	struct i596_cmd *cmd_tail;
	struct i596_cmd *cmd_head;
	int cmd_backlog;
	unsigned long last_cmd;
	spinlock_t cmd_lock;
};

static char init_setup[14] = {
	0x8E,	/* length 14 bytes, prefetch on */
	0xC8,	/* default: fifo to 8, monitor off */
	0x40,	/* default: don't save bad frames (apricot.c had 0x80) */
	0x2E,	/* (default is 0x26)
		   No source address insertion, 8 byte preamble */
	0x00,	/* default priority and backoff */
	0x60,	/* default interframe spacing */
	0x00,	/* default slot time LSB */
	0xf2,	/* default slot time and nr of retries */
	0x00,	/* default various bits
		   (0: promiscuous mode, 1: broadcast disable,
		    2: encoding mode, 3: transmit on no CRS,
		    4: no CRC insertion, 5: CRC type,
		    6: bit stuffing, 7: padding) */
	0x00,	/* default carrier sense and collision detect */
	0x40,	/* default minimum frame length */
	0xff,	/* (default is 0xff, and that is what apricot.c has;
		   elp486.c has 0xfb: Enable crc append in memory.) */
	0x00,	/* default: not full duplex */
	0x7f	/* (default is 0x3f) 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 print_eth(char *);
static void set_multicast_list(struct net_device *dev);
static void i596_tx_timeout(struct net_device *dev);

static int
i596_timeout(struct net_device *dev, char *msg, int ct) {
	struct i596_private *lp;
	int boguscnt = ct;

	lp = netdev_priv(dev);
	while (lp->scb.command) {
		if (--boguscnt == 0) {
			printk("%s: %s timed out - stat %4.4x, cmd %4.4x\n",
			       dev->name, msg,
			       lp->scb.status, lp->scb.command);
			return 1;
		}
		udelay(5);
		barrier();
	}
	return 0;
}

static inline int
init_rx_bufs(struct net_device *dev, int num) {
	struct i596_private *lp;
	struct i596_rfd *rfd;
	int i;
	// struct i596_rbd *rbd;

	lp = netdev_priv(dev);
	lp->scb.pa_rfd = I596_NULL;

	for (i = 0; i < num; i++) {
		rfd = kmalloc(sizeof(struct i596_rfd), GFP_KERNEL);
		if (rfd == NULL)
			break;

		rfd->stat = 0;
		rfd->pa_rbd = I596_NULL;
		rfd->count = 0;
		rfd->size = 1532;
		if (i == 0) {
			rfd->cmd = CMD_EOL;
			lp->rx_tail = rfd;
		} else {
			rfd->cmd = 0;
		}
		rfd->pa_next = lp->scb.pa_rfd;
		lp->scb.pa_rfd = va_to_pa(rfd);
		lp->rx_tail->pa_next = lp->scb.pa_rfd;
	}

#if 0
	for (i = 0; i<RX_RBD_SIZE; i++) {
		rbd = kmalloc(sizeof(struct i596_rbd), GFP_KERNEL);
		if (rbd) {
			rbd->pad = 0;
			rbd->count = 0;
			rbd->skb = dev_alloc_skb(RX_SKBSIZE);
			if (!rbd->skb) {
				printk("dev_alloc_skb failed");
			}
			rbd->next = rfd->rbd;
			if (i) {
				rfd->rbd->prev = rbd;
				rbd->size = RX_SKBSIZE;
			} else {
				rbd->size = (RX_SKBSIZE | RBD_EL);
				lp->rbd_tail = rbd;
			}

			rfd->rbd = rbd;
		} else {
			printk("Could not kmalloc rbd\n");
		}
	}
	lp->rbd_tail->next = rfd->rbd;
#endif
	return (i);
}

static inline void
remove_rx_bufs(struct net_device *dev) {
	struct i596_private *lp;
	struct i596_rfd *rfd;

	lp = netdev_priv(dev);
	lp->rx_tail->pa_next = I596_NULL;

	do {
		rfd = pa_to_va(lp->scb.pa_rfd);
		lp->scb.pa_rfd = rfd->pa_next;
		kfree(rfd);
	} while (rfd != lp->rx_tail);

	lp->rx_tail = NULL;

#if 0
	for (lp->rbd_list) {
	}
#endif
}

#define PORT_RESET              0x00    /* reset 82596 */
#define PORT_SELFTEST           0x01    /* selftest */
#define PORT_ALTSCP             0x02    /* alternate SCB address */
#define PORT_DUMP               0x03    /* dump */

#define IOADDR	0xcb0		/* real constant */
#define IRQ	10		/* default IRQ - can be changed by ECU */

/* The 82596 requires two 16-bit write cycles for a port command */
static inline void
PORT(phys_addr a, unsigned int cmd) {
	if (a & 0xf)
		printk("lp486e.c: PORT: address not aligned\n");
	outw(((a & 0xffff) | cmd), IOADDR);
	outw(((a>>16) & 0xffff), IOADDR+2);
}

static inline void
CA(void) {
	outb(0, IOADDR+4);
	udelay(8);
}

static inline void
CLEAR_INT(void) {
	outb(0, IOADDR+8);
}

#if 0
/* selftest or dump */
static void
i596_port_do(struct net_device *dev, int portcmd, char *cmdname) {
	struct i596_private *lp = netdev_priv(dev);
	u16 *outp;
	int i, m;

	memset((void *)&(lp->dump), 0, sizeof(struct i596_dump));
	outp = &(lp->dump.dump[0]);

	PORT(va_to_pa(outp), portcmd);
	mdelay(30);             /* random, unmotivated */

	printk("lp486e i82596 %s result:\n", cmdname);
	for (m = ARRAY_SIZE(lp->dump.dump); m && lp->dump.dump[m-1] == 0; m--)
		;
	for (i = 0; i < m; i++) {
		printk(" %04x", lp->dump.dump[i]);
		if (i%8 == 7)
			printk("\n");
	}
	printk("\n");
}
#endif

static int
i596_scp_setup(struct net_device *dev) {
	struct i596_private *lp = netdev_priv(dev);
	int boguscnt;

	/* Setup SCP, ISCP, SCB */
	/*
	 * sysbus bits:
	 *  only a single byte is significant - here 0x44
	 *  0x80: big endian mode (details depend on stepping)
	 *  0x40: 1
	 *  0x20: interrupt pin is active low
	 *  0x10: lock function disabled
	 *  0x08: external triggering of bus throttle timers
	 *  0x06: 00: 82586 compat mode, 01: segmented mode, 10: linear mode
	 *  0x01: unused
	 */
	lp->scp.sysbus = 0x00440000; 		/* linear mode */
	lp->scp.pad = 0;			/* must be zero */
	lp->scp.pa_iscp = va_to_pa(&(lp->iscp));

	/*
	 * The CPU sets the ISCP to 1 before it gives the first CA()
	 */
	lp->iscp.busy = 0x0001;
	lp->iscp.pa_scb = va_to_pa(&(lp->scb));

	lp->scb.command = 0;
	lp->scb.status = 0;
	lp->scb.pa_cmd = I596_NULL;
	/* lp->scb.pa_rfd has been initialised already */

	lp->last_cmd = jiffies;
	lp->cmd_backlog = 0;
	lp->cmd_head = NULL;

	/*
	 * Reset the 82596.
	 * We need to wait 10 systemclock cycles, and
	 * 5 serial clock cycles.
	 */
	PORT(0, PORT_RESET);	/* address part ignored */
	udelay(100);

	/*
	 * Before the CA signal is asserted, the default SCP address
	 * (0x00fffff4) can be changed to a 16-byte aligned value
	 */
	PORT(va_to_pa(&lp->scp), PORT_ALTSCP);	/* change the scp address */

	/*
	 * The initialization procedure begins when a
	 * Channel Attention signal is asserted after a reset.
	 */

	CA();

	/*
	 * The ISCP busy is cleared by the 82596 after the SCB address is read.
	 */
	boguscnt = 100;
	while (lp->iscp.busy) {
		if (--boguscnt == 0) {
			/* No i82596 present? */
			printk("%s: i82596 initialization timed out\n",
			       dev->name);
			return 1;
		}
		udelay(5);
		barrier();
	}
	/* I find here boguscnt==100, so no delay was required. */

	return 0;
}

static int
init_i596(struct net_device *dev) {
	struct i596_private *lp;

	if (i596_scp_setup(dev))
		return 1;

	lp = netdev_priv(dev);
	lp->scb.command = 0;

	memcpy ((void *)lp->i596_config, init_setup, 14);
	lp->set_conf.command = CmdConfigure;
	i596_add_cmd(dev, (void *)&lp->set_conf);

	memcpy ((void *)lp->eth_addr, dev->dev_addr, 6);
	lp->set_add.command = CmdIASetup;
	i596_add_cmd(dev, (struct i596_cmd *)&lp->set_add);

	lp->tdr.command = CmdTDR;
	i596_add_cmd(dev, (struct i596_cmd *)&lp->tdr);

	if (lp->scb.command && i596_timeout(dev, "i82596 init", 200))
		return 1;

	lp->scb.command = RX_START;
	CA();

	barrier();

	if (lp->scb.command && i596_timeout(dev, "Receive Unit start", 100))
		return 1;

	return 0;
}

/* Receive a single frame */
static inline int
i596_rx_one(struct net_device *dev, struct i596_private *lp,
	    struct i596_rfd *rfd, int *frames) {

	if (rfd->stat & RFD_STAT_OK) {
		/* a good frame */
		int pkt_len = (rfd->count & 0x3fff);
		struct sk_buff *skb = dev_alloc_skb(pkt_len);

		(*frames)++;

		if (rfd->cmd & CMD_EOL)
			printk("Received on EOL\n");

		if (skb == NULL) {
			printk ("%s: i596_rx Memory squeeze, "
				"dropping packet.\n", dev->name);
			dev->stats.rx_dropped++;
			return 1;
		}

		memcpy(skb_put(skb,pkt_len), rfd->data, pkt_len);

		skb->protocol = eth_type_trans(skb,dev);
		netif_rx(skb);
		dev->stats.rx_packets++;
	} else {
#if 0
		printk("Frame reception error status %04x\n",
		       rfd->stat);
#endif
		dev->stats.rx_errors++;
		if (rfd->stat & RFD_COLLISION)
			dev->stats.collisions++;
		if (rfd->stat & RFD_SHORT_FRAME_ERR)
			dev->stats.rx_length_errors++;
		if (rfd->stat & RFD_DMA_ERR)
			dev->stats.rx_over_errors++;
		if (rfd->stat & RFD_NOBUFS_ERR)
			dev->stats.rx_fifo_errors++;
		if (rfd->stat & RFD_ALIGN_ERR)
			dev->stats.rx_frame_errors++;
		if (rfd->stat & RFD_CRC_ERR)
			dev->stats.rx_crc_errors++;
		if (rfd->stat & RFD_LENGTH_ERR)
			dev->stats.rx_length_errors++;
	}
	rfd->stat = rfd->count = 0;
	return 0;
}

static int
i596_rx(struct net_device *dev) {
	struct i596_private *lp = netdev_priv(dev);
	struct i596_rfd *rfd;
	int frames = 0;

	while (1) {
		rfd = pa_to_va(lp->scb.pa_rfd);
		if (!rfd) {
			printk(KERN_ERR "i596_rx: NULL rfd?\n");
			return 0;
		}
#if 1
		if (rfd->stat && !(rfd->stat & (RFD_STAT_C | RFD_STAT_B)))
			printk("SF:%p-%04x\n", rfd, rfd->stat);
#endif
		if (!(rfd->stat & RFD_STAT_C))
			break;		/* next one not ready */
		if (i596_rx_one(dev, lp, rfd, &frames))
			break;		/* out of memory */
		rfd->cmd = CMD_EOL;
		lp->rx_tail->cmd = 0;
		lp->rx_tail = rfd;
		lp->scb.pa_rfd = rfd->pa_next;
		barrier();
	}

	return frames;
}

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

	lp = netdev_priv(dev);
	while (lp->cmd_head) {
		cmd = (struct i596_cmd *)lp->cmd_head;

		lp->cmd_head = pa_to_va(lp->cmd_head->pa_next);
		lp->cmd_backlog--;

		switch ((cmd->command) & 0x7) {
			case CmdTx: {
				struct tx_cmd *tx_cmd = (struct tx_cmd *) cmd;
				struct i596_tbd * tx_cmd_tbd;
				tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd);

				dev_kfree_skb_any(tx_cmd_tbd->skb);

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

				cmd->pa_next = I596_NULL;
				kfree((unsigned char *)tx_cmd);
				netif_wake_queue(dev);
				break;
			}
			case CmdMulticastList: {
				// unsigned short count = *((unsigned short *) (ptr + 1));

				cmd->pa_next = I596_NULL;
				kfree((unsigned char *)cmd);
				break;
			}
			default: {
				cmd->pa_next = I596_NULL;
				break;
			}
		}
		barrier();
	}

	if (lp->scb.command && i596_timeout(dev, "i596_cleanup_cmd", 100))
		;

	lp->scb.pa_cmd = va_to_pa(lp->cmd_head);
}

static void i596_reset(struct net_device *dev, struct i596_private *lp, int ioaddr) {

	if (lp->scb.command && i596_timeout(dev, "i596_reset", 100))
		;

	netif_stop_queue(dev);

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

	/* wait for shutdown */
	if (lp->scb.command && i596_timeout(dev, "i596_reset(2)", 400))
		;

	i596_cleanup_cmd(dev);
	i596_rx(dev);

	netif_start_queue(dev);
	/*dev_kfree_skb(skb, FREE_WRITE);*/
	init_i596(dev);
}

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

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

	spin_lock_irqsave(&lp->cmd_lock, flags);

	if (lp->cmd_head) {
		lp->cmd_tail->pa_next = va_to_pa(cmd);
	} else {
		lp->cmd_head = cmd;
		if (lp->scb.command && i596_timeout(dev, "i596_add_cmd", 100))
			;
		lp->scb.pa_cmd = va_to_pa(cmd);
		lp->scb.command = CUC_START;
		CA();
	}
	lp->cmd_tail = cmd;
	lp->cmd_backlog++;

	lp->cmd_head = pa_to_va(lp->scb.pa_cmd);
	spin_unlock_irqrestore(&lp->cmd_lock, flags);

	if (lp->cmd_backlog > 16) {
		int tickssofar = jiffies - lp->last_cmd;
		if (tickssofar < HZ/4)
			return;

		printk(KERN_WARNING "%s: command unit timed out, status resetting.\n", dev->name);
		i596_reset(dev, lp, ioaddr);
	}
}

static int i596_open(struct net_device *dev)
{
	int i;

	i = request_irq(dev->irq, i596_interrupt, IRQF_SHARED, dev->name, dev);
	if (i) {
		printk(KERN_ERR "%s: IRQ %d not free\n", dev->name, dev->irq);
		return i;
	}

	if ((i = init_rx_bufs(dev, RX_RING_SIZE)) < RX_RING_SIZE)
		printk(KERN_ERR "%s: only able to allocate %d receive buffers\n", dev->name, i);

	if (i < 4) {
		free_irq(dev->irq, dev);
		return -EAGAIN;
	}
	netif_start_queue(dev);
	init_i596(dev);
	return 0;			/* Always succeed */
}

static netdev_tx_t i596_start_xmit (struct sk_buff *skb, struct net_device *dev) {
	struct tx_cmd *tx_cmd;
	short length;

	length = skb->len;

	if (length < ETH_ZLEN) {
		if (skb_padto(skb, ETH_ZLEN))
			return NETDEV_TX_OK;
		length = ETH_ZLEN;
	}

	tx_cmd = kmalloc((sizeof (struct tx_cmd) + sizeof (struct i596_tbd)), GFP_ATOMIC);
	if (tx_cmd == NULL) {
		printk(KERN_WARNING "%s: i596_xmit Memory squeeze, dropping packet.\n", dev->name);
		dev->stats.tx_dropped++;
		dev_kfree_skb (skb);
	} else {
		struct i596_tbd *tx_cmd_tbd;
		tx_cmd_tbd = (struct i596_tbd *) (tx_cmd + 1);
		tx_cmd->pa_tbd = va_to_pa (tx_cmd_tbd);
		tx_cmd_tbd->pa_next = I596_NULL;

		tx_cmd->cmd.command = (CMD_FLEX | CmdTx);

		tx_cmd->pad = 0;
		tx_cmd->size = 0;
		tx_cmd_tbd->pad = 0;
		tx_cmd_tbd->size = (EOF | length);

		tx_cmd_tbd->pa_data = va_to_pa (skb->data);
		tx_cmd_tbd->skb = skb;

		if (i596_debug & LOG_SRCDST)
			print_eth (skb->data);

		i596_add_cmd (dev, (struct i596_cmd *) tx_cmd);

		dev->stats.tx_packets++;
	}

	return NETDEV_TX_OK;
}

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

	/* Transmitter timeout, serious problems. */
	printk(KERN_WARNING "%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) {
		printk ("Resetting board.\n");

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

static void print_eth(char *add)
{
	int i;

	printk ("Dest  ");
	for (i = 0; i < 6; i++)
		printk(" %2.2X", (unsigned char) add[i]);
	printk ("\n");

	printk ("Source");
	for (i = 0; i < 6; i++)
		printk(" %2.2X", (unsigned char) add[i+6]);
	printk ("\n");

	printk ("type %2.2X%2.2X\n",
		(unsigned char) add[12], (unsigned char) add[13]);
}

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,
};

static int __init lp486e_probe(struct net_device *dev) {
	struct i596_private *lp;
	unsigned char eth_addr[6] = { 0, 0xaa, 0, 0, 0, 0 };
	unsigned char *bios;
	int i, j;
	int ret = -ENOMEM;
	static int probed;

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

	if (!request_region(IOADDR, LP486E_TOTAL_SIZE, DRV_NAME)) {
		printk(KERN_ERR "lp486e: IO address 0x%x in use\n", IOADDR);
		return -EBUSY;
	}

	lp = netdev_priv(dev);
	spin_lock_init(&lp->cmd_lock);

	/*
	 * Do we really have this thing?
	 */
	if (i596_scp_setup(dev)) {
		ret = -ENODEV;
		goto err_out_kfree;
	}

	dev->base_addr = IOADDR;
	dev->irq = IRQ;


	/*
	 * How do we find the ethernet address? I don't know.
	 * One possibility is to look at the EISA configuration area
	 * [0xe8000-0xe9fff]. This contains the ethernet address
	 * but not at a fixed address - things depend on setup options.
	 *
	 * If we find no address, or the wrong address, use
	 *   ifconfig eth0 hw ether a1:a2:a3:a4:a5:a6
	 * with the value found in the BIOS setup.
	 */
	bios = bus_to_virt(0xe8000);
	for (j = 0; j < 0x2000; j++) {
		if (bios[j] == 0 && bios[j+1] == 0xaa && bios[j+2] == 0) {
			printk("%s: maybe address at BIOS 0x%x:",
			       dev->name, 0xe8000+j);
			for (i = 0; i < 6; i++) {
				eth_addr[i] = bios[i+j];
				printk(" %2.2X", eth_addr[i]);
			}
			printk("\n");
		}
	}

	printk("%s: lp486e 82596 at %#3lx, IRQ %d,",
	       dev->name, dev->base_addr, dev->irq);
	for (i = 0; i < 6; i++)
		printk(" %2.2X", dev->dev_addr[i] = eth_addr[i]);
	printk("\n");

	/* The LP486E-specific entries in the device structure. */
	dev->netdev_ops = &i596_netdev_ops;
	dev->watchdog_timeo = 5*HZ;

#if 0
	/* selftest reports 0x320925ae - don't know what that means */
	i596_port_do(dev, PORT_SELFTEST, "selftest");
	i596_port_do(dev, PORT_DUMP, "dump");
#endif
	return 0;

err_out_kfree:
	release_region(IOADDR, LP486E_TOTAL_SIZE);
	return ret;
}

static inline void
i596_handle_CU_completion(struct net_device *dev,
			  struct i596_private *lp,
			  unsigned short status,
			  unsigned short *ack_cmdp) {
	struct i596_cmd *cmd;
	int frames_out = 0;
	int commands_done = 0;
	int cmd_val;
	unsigned long flags;

	spin_lock_irqsave(&lp->cmd_lock, flags);
	cmd = lp->cmd_head;

	while (lp->cmd_head && (lp->cmd_head->status & CMD_STAT_C)) {
		cmd = lp->cmd_head;

		lp->cmd_head = pa_to_va(lp->cmd_head->pa_next);
		lp->cmd_backlog--;

		commands_done++;
		cmd_val = cmd->command & 0x7;
#if 0
		printk("finished CU %s command (%d)\n",
		       CUcmdnames[cmd_val], cmd_val);
#endif
		switch (cmd_val) {
		case CmdTx:
		{
			struct tx_cmd *tx_cmd;
			struct i596_tbd *tx_cmd_tbd;

			tx_cmd = (struct tx_cmd *) cmd;
			tx_cmd_tbd = pa_to_va(tx_cmd->pa_tbd);

			frames_out++;
			if (cmd->status & CMD_STAT_OK) {
				if (i596_debug)
					print_eth(pa_to_va(tx_cmd_tbd->pa_data));
			} else {
				dev->stats.tx_errors++;
				if (i596_debug)
					printk("transmission failure:%04x\n",
					       cmd->status);
				if (cmd->status & 0x0020)
					dev->stats.collisions++;
				if (!(cmd->status & 0x0040))
					dev->stats.tx_heartbeat_errors++;
				if (cmd->status & 0x0400)
					dev->stats.tx_carrier_errors++;
				if (cmd->status & 0x0800)
					dev->stats.collisions++;
				if (cmd->status & 0x1000)
					dev->stats.tx_aborted_errors++;
			}
			dev_kfree_skb_irq(tx_cmd_tbd->skb);

			cmd->pa_next = I596_NULL;
			kfree((unsigned char *)tx_cmd);
			netif_wake_queue(dev);
			break;
		}

		case CmdMulticastList:
			cmd->pa_next = I596_NULL;
			kfree((unsigned char *)cmd);
			break;

		case CmdTDR:
		{
			unsigned long status = *((unsigned long *) (cmd + 1));
			if (status & 0x8000) {
				if (i596_debug)
					printk("%s: link ok.\n", dev->name);
			} else {
				if (status & 0x4000)
					printk("%s: Transceiver problem.\n",
					       dev->name);
				if (status & 0x2000)
					printk("%s: Termination problem.\n",
					       dev->name);
				if (status & 0x1000)
					printk("%s: Short circuit.\n",
					       dev->name);
				printk("%s: Time %ld.\n",
				       dev->name, status & 0x07ff);
			}
		}
		default:
			cmd->pa_next = I596_NULL;
			lp->last_cmd = jiffies;

		}
		barrier();
	}

	cmd = lp->cmd_head;
	while (cmd && (cmd != lp->cmd_tail)) {
		cmd->command &= 0x1fff;
		cmd = pa_to_va(cmd->pa_next);
		barrier();
	}

	if (lp->cmd_head)
		*ack_cmdp |= CUC_START;
	lp->scb.pa_cmd = va_to_pa(lp->cmd_head);
	spin_unlock_irqrestore(&lp->cmd_lock, flags);
}

static irqreturn_t
i596_interrupt(int irq, void *dev_instance)
{
	struct net_device *dev = dev_instance;
	struct i596_private *lp = netdev_priv(dev);
	unsigned short status, ack_cmd = 0;
	int frames_in = 0;

	/*
	 * The 82596 examines the command, performs the required action,
	 * and then clears the SCB command word.
	 */
	if (lp->scb.command && i596_timeout(dev, "interrupt", 40))
		;

	/*
	 * The status word indicates the status of the 82596.
	 * It is modified only by the 82596.
	 *
	 * [So, we must not clear it. I find often status 0xffff,
	 *  which is not one of the values allowed by the docs.]
	 */
	status = lp->scb.status;
#if 0
	if (i596_debug) {
		printk("%s: i596 interrupt, ", dev->name);
		i596_out_status(status);
	}
#endif
	/* Impossible, but it happens - perhaps when we get
	   a receive interrupt but scb.pa_rfd is I596_NULL. */
	if (status == 0xffff) {
		printk("%s: i596_interrupt: got status 0xffff\n", dev->name);
		goto out;
	}

	ack_cmd = (status & STAT_ACK);

	if (status & (STAT_CX | STAT_CNA))
		i596_handle_CU_completion(dev, lp, status, &ack_cmd);

	if (status & (STAT_FR | STAT_RNR)) {
		/* Restart the receive unit when it got inactive somehow */
		if ((status & STAT_RNR) && netif_running(dev))
			ack_cmd |= RX_START;

		if (status & STAT_FR) {
			frames_in = i596_rx(dev);
			if (!frames_in)
				printk("receive frame reported, but no frames\n");
		}
	}

	/* acknowledge the interrupt */
	/*
	if ((lp->scb.pa_cmd != I596_NULL) && netif_running(dev))
		ack_cmd |= CUC_START;
	*/

	if (lp->scb.command && i596_timeout(dev, "i596 interrupt", 100))
		;

	lp->scb.command = ack_cmd;

	CLEAR_INT();
	CA();

 out:
	return IRQ_HANDLED;
}

static int i596_close(struct net_device *dev) {
	struct i596_private *lp = netdev_priv(dev);

	netif_stop_queue(dev);

	if (i596_debug)
		printk("%s: Shutting down ethercard, status was %4.4x.\n",
		       dev->name, lp->scb.status);

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

	i596_cleanup_cmd(dev);

	if (lp->scb.command && i596_timeout(dev, "i596_close", 200))
		;

	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 = netdev_priv(dev);
	struct i596_cmd *cmd;

	if (i596_debug > 1)
		printk ("%s: set multicast list %d\n",
			dev->name, netdev_mc_count(dev));

	if (!netdev_mc_empty(dev)) {
		struct netdev_hw_addr *ha;
		char *cp;
		cmd = kmalloc(sizeof(struct i596_cmd) + 2 +
			      netdev_mc_count(dev) * 6, GFP_ATOMIC);
		if (cmd == NULL) {
			printk (KERN_ERR "%s: set_multicast Memory squeeze.\n", dev->name);
			return;
		}
		cmd->command = CmdMulticastList;
		*((unsigned short *) (cmd + 1)) = netdev_mc_count(dev) * 6;
		cp = ((char *)(cmd + 1))+2;
		netdev_for_each_mc_addr(ha, dev) {
			memcpy(cp, ha->addr, 6);
			cp += 6;
		}
		if (i596_debug & LOG_SRCDST)
			print_eth (((char *)(cmd + 1)) + 2);
		i596_add_cmd(dev, cmd);
	} else {
		if (lp->set_conf.pa_next != I596_NULL) {
			return;
		}
		if (netdev_mc_empty(dev) &&
		    !(dev->flags & (IFF_PROMISC | IFF_ALLMULTI))) {
			lp->i596_config[8] &= ~0x01;
		} else {
			lp->i596_config[8] |= 0x01;
		}

		i596_add_cmd(dev, (struct i596_cmd *) &lp->set_conf);
	}
}

MODULE_AUTHOR("Ard van Breemen <ard@cstmel.nl.eu.org>");
MODULE_DESCRIPTION("Intel Panther onboard i82596 driver");
MODULE_LICENSE("GPL");

static struct net_device *dev_lp486e;
static int full_duplex;
static int options;
static int io = IOADDR;
static int irq = IRQ;

module_param(debug, int, 0);
//module_param(max_interrupt_work, int, 0);
//module_param(reverse_probe, int, 0);
//module_param(rx_copybreak, int, 0);
module_param(options, int, 0);
module_param(full_duplex, int, 0);

static int __init lp486e_init_module(void) {
	int err;
	struct net_device *dev = alloc_etherdev(sizeof(struct i596_private));
	if (!dev)
		return -ENOMEM;

	dev->irq = irq;
	dev->base_addr = io;
	err = lp486e_probe(dev);
	if (err) {
		free_netdev(dev);
		return err;
	}
	err = register_netdev(dev);
	if (err) {
		release_region(dev->base_addr, LP486E_TOTAL_SIZE);
		free_netdev(dev);
		return err;
	}
	dev_lp486e = dev;
	full_duplex = 0;
	options = 0;
	return 0;
}

static void __exit lp486e_cleanup_module(void) {
	unregister_netdev(dev_lp486e);
	release_region(dev_lp486e->base_addr, LP486E_TOTAL_SIZE);
	free_netdev(dev_lp486e);
}

module_init(lp486e_init_module);
module_exit(lp486e_cleanup_module);