aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/i825xx/3c527.c
blob: 278e791afe0097ab834a4ebe5edeefd157778203 (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
/* 3c527.c: 3Com Etherlink/MC32 driver for Linux 2.4 and 2.6.
 *
 *	(c) Copyright 1998 Red Hat Software Inc
 *	Written by Alan Cox.
 *	Further debugging by Carl Drougge.
 *      Initial SMP support by Felipe W Damasio <felipewd@terra.com.br>
 *      Heavily modified by Richard Procter <rnp@paradise.net.nz>
 *
 *	Based on skeleton.c written 1993-94 by Donald Becker and ne2.c
 *	(for the MCA stuff) written by Wim Dumon.
 *
 *	Thanks to 3Com for making this possible by providing me with the
 *	documentation.
 *
 *	This software may be used and distributed according to the terms
 *	of the GNU General Public License, incorporated herein by reference.
 *
 */

#define DRV_NAME		"3c527"
#define DRV_VERSION		"0.7-SMP"
#define DRV_RELDATE		"2003/09/21"

static const char *version =
DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " Richard Procter <rnp@paradise.net.nz>\n";

/**
 * DOC: Traps for the unwary
 *
 *	The diagram (Figure 1-1) and the POS summary disagree with the
 *	"Interrupt Level" section in the manual.
 *
 *	The manual contradicts itself when describing the minimum number
 *	buffers in the 'configure lists' command.
 *	My card accepts a buffer config of 4/4.
 *
 *	Setting the SAV BP bit does not save bad packets, but
 *	only enables RX on-card stats collection.
 *
 *	The documentation in places seems to miss things. In actual fact
 *	I've always eventually found everything is documented, it just
 *	requires careful study.
 *
 * DOC: Theory Of Operation
 *
 *	The 3com 3c527 is a 32bit MCA bus mastering adapter with a large
 *	amount of on board intelligence that housekeeps a somewhat dumber
 *	Intel NIC. For performance we want to keep the transmit queue deep
 *	as the card can transmit packets while fetching others from main
 *	memory by bus master DMA. Transmission and reception are driven by
 *	circular buffer queues.
 *
 *	The mailboxes can be used for controlling how the card traverses
 *	its buffer rings, but are used only for initial setup in this
 *	implementation.  The exec mailbox allows a variety of commands to
 *	be executed. Each command must complete before the next is
 *	executed. Primarily we use the exec mailbox for controlling the
 *	multicast lists.  We have to do a certain amount of interesting
 *	hoop jumping as the multicast list changes can occur in interrupt
 *	state when the card has an exec command pending. We defer such
 *	events until the command completion interrupt.
 *
 *	A copy break scheme (taken from 3c59x.c) is employed whereby
 *	received frames exceeding a configurable length are passed
 *	directly to the higher networking layers without incuring a copy,
 *	in what amounts to a time/space trade-off.
 *
 *	The card also keeps a large amount of statistical information
 *	on-board. In a perfect world, these could be used safely at no
 *	cost. However, lacking information to the contrary, processing
 *	them without races would involve so much extra complexity as to
 *	make it unworthwhile to do so. In the end, a hybrid SW/HW
 *	implementation was made necessary --- see mc32_update_stats().
 *
 * DOC: Notes
 *
 *	It should be possible to use two or more cards, but at this stage
 *	only by loading two copies of the same module.
 *
 *	The on-board 82586 NIC has trouble receiving multiple
 *	back-to-back frames and so is likely to drop packets from fast
 *	senders.
**/

#include <linux/module.h>

#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/mca-legacy.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/wait.h>
#include <linux/ethtool.h>
#include <linux/completion.h>
#include <linux/bitops.h>
#include <linux/semaphore.h>

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

#include "3c527.h"

MODULE_LICENSE("GPL");

/*
 * The name of the card. Is used for messages and in the requests for
 * io regions, irqs and dma channels
 */
static const char* cardname = DRV_NAME;

/* use 0 for production, 1 for verification, >2 for debug */
#ifndef NET_DEBUG
#define NET_DEBUG 2
#endif

static unsigned int mc32_debug = NET_DEBUG;

/* The number of low I/O ports used by the ethercard. */
#define MC32_IO_EXTENT	8

/* As implemented, values must be a power-of-2 -- 4/8/16/32 */
#define TX_RING_LEN     32       /* Typically the card supports 37  */
#define RX_RING_LEN     8        /*     "       "        "          */

/* Copy break point, see above for details.
 * Setting to > 1512 effectively disables this feature.	*/
#define RX_COPYBREAK    200      /* Value from 3c59x.c */

/* Issue the 82586 workaround command - this is for "busy lans", but
 * basically means for all lans now days - has a performance (latency)
 * cost, but best set. */
static const int WORKAROUND_82586=1;

/* Pointers to buffers and their on-card records */
struct mc32_ring_desc
{
	volatile struct skb_header *p;
	struct sk_buff *skb;
};

/* Information that needs to be kept for each board. */
struct mc32_local
{
	int slot;

	u32 base;
	volatile struct mc32_mailbox *rx_box;
	volatile struct mc32_mailbox *tx_box;
	volatile struct mc32_mailbox *exec_box;
        volatile struct mc32_stats *stats;    /* Start of on-card statistics */
        u16 tx_chain;           /* Transmit list start offset */
	u16 rx_chain;           /* Receive list start offset */
        u16 tx_len;             /* Transmit list count */
        u16 rx_len;             /* Receive list count */

	u16 xceiver_desired_state; /* HALTED or RUNNING */
	u16 cmd_nonblocking;    /* Thread is uninterested in command result */
	u16 mc_reload_wait;	/* A multicast load request is pending */
	u32 mc_list_valid;	/* True when the mclist is set */

	struct mc32_ring_desc tx_ring[TX_RING_LEN];	/* Host Transmit ring */
	struct mc32_ring_desc rx_ring[RX_RING_LEN];	/* Host Receive ring */

	atomic_t tx_count;	/* buffers left */
	atomic_t tx_ring_head;  /* index to tx en-queue end */
	u16 tx_ring_tail;       /* index to tx de-queue end */

	u16 rx_ring_tail;       /* index to rx de-queue end */

	struct semaphore cmd_mutex;    /* Serialises issuing of execute commands */
        struct completion execution_cmd; /* Card has completed an execute command */
	struct completion xceiver_cmd;   /* Card has completed a tx or rx command */
};

/* The station (ethernet) address prefix, used for a sanity check. */
#define SA_ADDR0 0x02
#define SA_ADDR1 0x60
#define SA_ADDR2 0xAC

struct mca_adapters_t {
	unsigned int	id;
	char		*name;
};

static const struct mca_adapters_t mc32_adapters[] = {
	{ 0x0041, "3COM EtherLink MC/32" },
	{ 0x8EF5, "IBM High Performance Lan Adapter" },
	{ 0x0000, NULL }
};


/* Macros for ring index manipulations */
static inline u16 next_rx(u16 rx) { return (rx+1)&(RX_RING_LEN-1); };
static inline u16 prev_rx(u16 rx) { return (rx-1)&(RX_RING_LEN-1); };

static inline u16 next_tx(u16 tx) { return (tx+1)&(TX_RING_LEN-1); };


/* Index to functions, as function prototypes. */
static int	mc32_probe1(struct net_device *dev, int ioaddr);
static int      mc32_command(struct net_device *dev, u16 cmd, void *data, int len);
static int	mc32_open(struct net_device *dev);
static void	mc32_timeout(struct net_device *dev);
static netdev_tx_t mc32_send_packet(struct sk_buff *skb,
				    struct net_device *dev);
static irqreturn_t mc32_interrupt(int irq, void *dev_id);
static int	mc32_close(struct net_device *dev);
static struct	net_device_stats *mc32_get_stats(struct net_device *dev);
static void	mc32_set_multicast_list(struct net_device *dev);
static void	mc32_reset_multicast_list(struct net_device *dev);
static const struct ethtool_ops netdev_ethtool_ops;

static void cleanup_card(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	unsigned slot = lp->slot;
	mca_mark_as_unused(slot);
	mca_set_adapter_name(slot, NULL);
	free_irq(dev->irq, dev);
	release_region(dev->base_addr, MC32_IO_EXTENT);
}

/**
 * mc32_probe 	-	Search for supported boards
 * @unit: interface number to use
 *
 * Because MCA bus is a real bus and we can scan for cards we could do a
 * single scan for all boards here. Right now we use the passed in device
 * structure and scan for only one board. This needs fixing for modules
 * in particular.
 */

struct net_device *__init mc32_probe(int unit)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct mc32_local));
	static int current_mca_slot = -1;
	int i;
	int err;

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

	if (unit >= 0)
		sprintf(dev->name, "eth%d", unit);

	/* Do not check any supplied i/o locations.
	   POS registers usually don't fail :) */

	/* MCA cards have POS registers.
	   Autodetecting MCA cards is extremely simple.
	   Just search for the card. */

	for(i = 0; (mc32_adapters[i].name != NULL); i++) {
		current_mca_slot =
			mca_find_unused_adapter(mc32_adapters[i].id, 0);

		if(current_mca_slot != MCA_NOTFOUND) {
			if(!mc32_probe1(dev, current_mca_slot))
			{
				mca_set_adapter_name(current_mca_slot,
						mc32_adapters[i].name);
				mca_mark_as_used(current_mca_slot);
				err = register_netdev(dev);
				if (err) {
					cleanup_card(dev);
					free_netdev(dev);
					dev = ERR_PTR(err);
				}
				return dev;
			}

		}
	}
	free_netdev(dev);
	return ERR_PTR(-ENODEV);
}

static const struct net_device_ops netdev_ops = {
	.ndo_open		= mc32_open,
	.ndo_stop		= mc32_close,
	.ndo_start_xmit		= mc32_send_packet,
	.ndo_get_stats		= mc32_get_stats,
	.ndo_set_rx_mode	= mc32_set_multicast_list,
	.ndo_tx_timeout		= mc32_timeout,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

/**
 * mc32_probe1	-	Check a given slot for a board and test the card
 * @dev:  Device structure to fill in
 * @slot: The MCA bus slot being used by this card
 *
 * Decode the slot data and configure the card structures. Having done this we
 * can reset the card and configure it. The card does a full self test cycle
 * in firmware so we have to wait for it to return and post us either a
 * failure case or some addresses we use to find the board internals.
 */

static int __init mc32_probe1(struct net_device *dev, int slot)
{
	static unsigned version_printed;
	int i, err;
	u8 POS;
	u32 base;
	struct mc32_local *lp = netdev_priv(dev);
	static const u16 mca_io_bases[] = {
		0x7280,0x7290,
		0x7680,0x7690,
		0x7A80,0x7A90,
		0x7E80,0x7E90
	};
	static const u32 mca_mem_bases[] = {
		0x00C0000,
		0x00C4000,
		0x00C8000,
		0x00CC000,
		0x00D0000,
		0x00D4000,
		0x00D8000,
		0x00DC000
	};
	static const char * const failures[] = {
		"Processor instruction",
		"Processor data bus",
		"Processor data bus",
		"Processor data bus",
		"Adapter bus",
		"ROM checksum",
		"Base RAM",
		"Extended RAM",
		"82586 internal loopback",
		"82586 initialisation failure",
		"Adapter list configuration error"
	};

	/* Time to play MCA games */

	if (mc32_debug  &&  version_printed++ == 0)
		pr_debug("%s", version);

	pr_info("%s: %s found in slot %d: ", dev->name, cardname, slot);

	POS = mca_read_stored_pos(slot, 2);

	if(!(POS&1))
	{
		pr_cont("disabled.\n");
		return -ENODEV;
	}

	/* Fill in the 'dev' fields. */
	dev->base_addr = mca_io_bases[(POS>>1)&7];
	dev->mem_start = mca_mem_bases[(POS>>4)&7];

	POS = mca_read_stored_pos(slot, 4);
	if(!(POS&1))
	{
		pr_cont("memory window disabled.\n");
		return -ENODEV;
	}

	POS = mca_read_stored_pos(slot, 5);

	i=(POS>>4)&3;
	if(i==3)
	{
		pr_cont("invalid memory window.\n");
		return -ENODEV;
	}

	i*=16384;
	i+=16384;

	dev->mem_end=dev->mem_start + i;

	dev->irq = ((POS>>2)&3)+9;

	if(!request_region(dev->base_addr, MC32_IO_EXTENT, cardname))
	{
		pr_cont("io 0x%3lX, which is busy.\n", dev->base_addr);
		return -EBUSY;
	}

	pr_cont("io 0x%3lX irq %d mem 0x%lX (%dK)\n",
		dev->base_addr, dev->irq, dev->mem_start, i/1024);


	/* We ought to set the cache line size here.. */


	/*
	 *	Go PROM browsing
	 */

	/* Retrieve and print the ethernet address. */
	for (i = 0; i < 6; i++)
	{
		mca_write_pos(slot, 6, i+12);
		mca_write_pos(slot, 7, 0);

		dev->dev_addr[i] = mca_read_pos(slot,3);
	}

	pr_info("%s: Address %pM ", dev->name, dev->dev_addr);

	mca_write_pos(slot, 6, 0);
	mca_write_pos(slot, 7, 0);

	POS = mca_read_stored_pos(slot, 4);

	if(POS&2)
		pr_cont(": BNC port selected.\n");
	else
		pr_cont(": AUI port selected.\n");

	POS=inb(dev->base_addr+HOST_CTRL);
	POS|=HOST_CTRL_ATTN|HOST_CTRL_RESET;
	POS&=~HOST_CTRL_INTE;
	outb(POS, dev->base_addr+HOST_CTRL);
	/* Reset adapter */
	udelay(100);
	/* Reset off */
	POS&=~(HOST_CTRL_ATTN|HOST_CTRL_RESET);
	outb(POS, dev->base_addr+HOST_CTRL);

	udelay(300);

	/*
	 *	Grab the IRQ
	 */

	err = request_irq(dev->irq, mc32_interrupt, IRQF_SHARED, DRV_NAME, dev);
	if (err) {
		release_region(dev->base_addr, MC32_IO_EXTENT);
		pr_err("%s: unable to get IRQ %d.\n", DRV_NAME, dev->irq);
		goto err_exit_ports;
	}

	memset(lp, 0, sizeof(struct mc32_local));
	lp->slot = slot;

	i=0;

	base = inb(dev->base_addr);

	while(base == 0xFF)
	{
		i++;
		if(i == 1000)
		{
			pr_err("%s: failed to boot adapter.\n", dev->name);
			err = -ENODEV;
			goto err_exit_irq;
		}
		udelay(1000);
		if(inb(dev->base_addr+2)&(1<<5))
			base = inb(dev->base_addr);
	}

	if(base>0)
	{
		if(base < 0x0C)
			pr_err("%s: %s%s.\n", dev->name, failures[base-1],
				base<0x0A?" test failure":"");
		else
			pr_err("%s: unknown failure %d.\n", dev->name, base);
		err = -ENODEV;
		goto err_exit_irq;
	}

	base=0;
	for(i=0;i<4;i++)
	{
		int n=0;

		while(!(inb(dev->base_addr+2)&(1<<5)))
		{
			n++;
			udelay(50);
			if(n>100)
			{
				pr_err("%s: mailbox read fail (%d).\n", dev->name, i);
				err = -ENODEV;
				goto err_exit_irq;
			}
		}

		base|=(inb(dev->base_addr)<<(8*i));
	}

	lp->exec_box=isa_bus_to_virt(dev->mem_start+base);

	base=lp->exec_box->data[1]<<16|lp->exec_box->data[0];

	lp->base = dev->mem_start+base;

	lp->rx_box=isa_bus_to_virt(lp->base + lp->exec_box->data[2]);
	lp->tx_box=isa_bus_to_virt(lp->base + lp->exec_box->data[3]);

	lp->stats = isa_bus_to_virt(lp->base + lp->exec_box->data[5]);

	/*
	 *	Descriptor chains (card relative)
	 */

	lp->tx_chain 		= lp->exec_box->data[8];   /* Transmit list start offset */
	lp->rx_chain 		= lp->exec_box->data[10];  /* Receive list start offset */
	lp->tx_len 		= lp->exec_box->data[9];   /* Transmit list count */
	lp->rx_len 		= lp->exec_box->data[11];  /* Receive list count */

	sema_init(&lp->cmd_mutex, 0);
	init_completion(&lp->execution_cmd);
	init_completion(&lp->xceiver_cmd);

	pr_info("%s: Firmware Rev %d. %d RX buffers, %d TX buffers. Base of 0x%08X.\n",
		dev->name, lp->exec_box->data[12], lp->rx_len, lp->tx_len, lp->base);

	dev->netdev_ops		= &netdev_ops;
	dev->watchdog_timeo	= HZ*5;	/* Board does all the work */
	dev->ethtool_ops	= &netdev_ethtool_ops;

	return 0;

err_exit_irq:
	free_irq(dev->irq, dev);
err_exit_ports:
	release_region(dev->base_addr, MC32_IO_EXTENT);
	return err;
}


/**
 *	mc32_ready_poll		-	wait until we can feed it a command
 *	@dev:	The device to wait for
 *
 *	Wait until the card becomes ready to accept a command via the
 *	command register. This tells us nothing about the completion
 *	status of any pending commands and takes very little time at all.
 */

static inline void mc32_ready_poll(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	while(!(inb(ioaddr+HOST_STATUS)&HOST_STATUS_CRR));
}


/**
 *	mc32_command_nowait	-	send a command non blocking
 *	@dev: The 3c527 to issue the command to
 *	@cmd: The command word to write to the mailbox
 *	@data: A data block if the command expects one
 *	@len: Length of the data block
 *
 *	Send a command from interrupt state. If there is a command
 *	currently being executed then we return an error of -1. It
 *	simply isn't viable to wait around as commands may be
 *	slow. This can theoretically be starved on SMP, but it's hard
 *	to see a realistic situation.  We do not wait for the command
 *	to complete --- we rely on the interrupt handler to tidy up
 *	after us.
 */

static int mc32_command_nowait(struct net_device *dev, u16 cmd, void *data, int len)
{
	struct mc32_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;
	int ret = -1;

	if (down_trylock(&lp->cmd_mutex) == 0)
	{
		lp->cmd_nonblocking=1;
		lp->exec_box->mbox=0;
		lp->exec_box->mbox=cmd;
		memcpy((void *)lp->exec_box->data, data, len);
		barrier();	/* the memcpy forgot the volatile so be sure */

		/* Send the command */
		mc32_ready_poll(dev);
		outb(1<<6, ioaddr+HOST_CMD);

		ret = 0;

		/* Interrupt handler will signal mutex on completion */
	}

	return ret;
}


/**
 *	mc32_command	-	send a command and sleep until completion
 *	@dev: The 3c527 card to issue the command to
 *	@cmd: The command word to write to the mailbox
 *	@data: A data block if the command expects one
 *	@len: Length of the data block
 *
 *	Sends exec commands in a user context. This permits us to wait around
 *	for the replies and also to wait for the command buffer to complete
 *	from a previous command before we execute our command. After our
 *	command completes we will attempt any pending multicast reload
 *	we blocked off by hogging the exec buffer.
 *
 *	You feed the card a command, you wait, it interrupts you get a
 *	reply. All well and good. The complication arises because you use
 *	commands for filter list changes which come in at bh level from things
 *	like IPV6 group stuff.
 */

static int mc32_command(struct net_device *dev, u16 cmd, void *data, int len)
{
	struct mc32_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;
	int ret = 0;

	down(&lp->cmd_mutex);

	/*
	 *     My Turn
	 */

	lp->cmd_nonblocking=0;
	lp->exec_box->mbox=0;
	lp->exec_box->mbox=cmd;
	memcpy((void *)lp->exec_box->data, data, len);
	barrier();	/* the memcpy forgot the volatile so be sure */

	mc32_ready_poll(dev);
	outb(1<<6, ioaddr+HOST_CMD);

	wait_for_completion(&lp->execution_cmd);

	if(lp->exec_box->mbox&(1<<13))
		ret = -1;

	up(&lp->cmd_mutex);

	/*
	 *	A multicast set got blocked - try it now
         */

	if(lp->mc_reload_wait)
	{
		mc32_reset_multicast_list(dev);
	}

	return ret;
}


/**
 *	mc32_start_transceiver	-	tell board to restart tx/rx
 *	@dev: The 3c527 card to issue the command to
 *
 *	This may be called from the interrupt state, where it is used
 *	to restart the rx ring if the card runs out of rx buffers.
 *
 * 	We must first check if it's ok to (re)start the transceiver. See
 *      mc32_close for details.
 */

static void mc32_start_transceiver(struct net_device *dev) {

	struct mc32_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	/* Ignore RX overflow on device closure */
	if (lp->xceiver_desired_state==HALTED)
		return;

	/* Give the card the offset to the post-EOL-bit RX descriptor */
	mc32_ready_poll(dev);
	lp->rx_box->mbox=0;
	lp->rx_box->data[0]=lp->rx_ring[prev_rx(lp->rx_ring_tail)].p->next;
	outb(HOST_CMD_START_RX, ioaddr+HOST_CMD);

	mc32_ready_poll(dev);
	lp->tx_box->mbox=0;
	outb(HOST_CMD_RESTRT_TX, ioaddr+HOST_CMD);   /* card ignores this on RX restart */

	/* We are not interrupted on start completion */
}


/**
 *	mc32_halt_transceiver	-	tell board to stop tx/rx
 *	@dev: The 3c527 card to issue the command to
 *
 *	We issue the commands to halt the card's transceiver. In fact,
 *	after some experimenting we now simply tell the card to
 *	suspend. When issuing aborts occasionally odd things happened.
 *
 *	We then sleep until the card has notified us that both rx and
 *	tx have been suspended.
 */

static void mc32_halt_transceiver(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	mc32_ready_poll(dev);
	lp->rx_box->mbox=0;
	outb(HOST_CMD_SUSPND_RX, ioaddr+HOST_CMD);
	wait_for_completion(&lp->xceiver_cmd);

	mc32_ready_poll(dev);
	lp->tx_box->mbox=0;
	outb(HOST_CMD_SUSPND_TX, ioaddr+HOST_CMD);
	wait_for_completion(&lp->xceiver_cmd);
}


/**
 *	mc32_load_rx_ring	-	load the ring of receive buffers
 *	@dev: 3c527 to build the ring for
 *
 *	This initialises the on-card and driver datastructures to
 *	the point where mc32_start_transceiver() can be called.
 *
 *	The card sets up the receive ring for us. We are required to use the
 *	ring it provides, although the size of the ring is configurable.
 *
 * 	We allocate an sk_buff for each ring entry in turn and
 * 	initialise its house-keeping info. At the same time, we read
 * 	each 'next' pointer in our rx_ring array. This reduces slow
 * 	shared-memory reads and makes it easy to access predecessor
 * 	descriptors.
 *
 *	We then set the end-of-list bit for the last entry so that the
 * 	card will know when it has run out of buffers.
 */

static int mc32_load_rx_ring(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	int i;
	u16 rx_base;
	volatile struct skb_header *p;

	rx_base=lp->rx_chain;

	for(i=0; i<RX_RING_LEN; i++) {
		lp->rx_ring[i].skb=alloc_skb(1532, GFP_KERNEL);
		if (lp->rx_ring[i].skb==NULL) {
			for (;i>=0;i--)
				kfree_skb(lp->rx_ring[i].skb);
			return -ENOBUFS;
		}
		skb_reserve(lp->rx_ring[i].skb, 18);

		p=isa_bus_to_virt(lp->base+rx_base);

		p->control=0;
		p->data=isa_virt_to_bus(lp->rx_ring[i].skb->data);
		p->status=0;
		p->length=1532;

		lp->rx_ring[i].p=p;
		rx_base=p->next;
	}

	lp->rx_ring[i-1].p->control |= CONTROL_EOL;

	lp->rx_ring_tail=0;

	return 0;
}


/**
 *	mc32_flush_rx_ring	-	free the ring of receive buffers
 *	@lp: Local data of 3c527 to flush the rx ring of
 *
 *	Free the buffer for each ring slot. This may be called
 *      before mc32_load_rx_ring(), eg. on error in mc32_open().
 *      Requires rx skb pointers to point to a valid skb, or NULL.
 */

static void mc32_flush_rx_ring(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	int i;

	for(i=0; i < RX_RING_LEN; i++)
	{
		if (lp->rx_ring[i].skb) {
			dev_kfree_skb(lp->rx_ring[i].skb);
			lp->rx_ring[i].skb = NULL;
		}
		lp->rx_ring[i].p=NULL;
	}
}


/**
 *	mc32_load_tx_ring	-	load transmit ring
 *	@dev: The 3c527 card to issue the command to
 *
 *	This sets up the host transmit data-structures.
 *
 *	First, we obtain from the card it's current position in the tx
 *	ring, so that we will know where to begin transmitting
 *	packets.
 *
 * 	Then, we read the 'next' pointers from the on-card tx ring into
 *  	our tx_ring array to reduce slow shared-mem reads. Finally, we
 * 	intitalise the tx house keeping variables.
 *
 */

static void mc32_load_tx_ring(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	volatile struct skb_header *p;
	int i;
	u16 tx_base;

	tx_base=lp->tx_box->data[0];

	for(i=0 ; i<TX_RING_LEN ; i++)
	{
		p=isa_bus_to_virt(lp->base+tx_base);
		lp->tx_ring[i].p=p;
		lp->tx_ring[i].skb=NULL;

		tx_base=p->next;
	}

	/* -1 so that tx_ring_head cannot "lap" tx_ring_tail */
	/* see mc32_tx_ring */

	atomic_set(&lp->tx_count, TX_RING_LEN-1);
	atomic_set(&lp->tx_ring_head, 0);
	lp->tx_ring_tail=0;
}


/**
 *	mc32_flush_tx_ring 	-	free transmit ring
 *	@lp: Local data of 3c527 to flush the tx ring of
 *
 *      If the ring is non-empty, zip over the it, freeing any
 *      allocated skb_buffs.  The tx ring house-keeping variables are
 *      then reset. Requires rx skb pointers to point to a valid skb,
 *      or NULL.
 */

static void mc32_flush_tx_ring(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	int i;

	for (i=0; i < TX_RING_LEN; i++)
	{
		if (lp->tx_ring[i].skb)
		{
			dev_kfree_skb(lp->tx_ring[i].skb);
			lp->tx_ring[i].skb = NULL;
		}
	}

	atomic_set(&lp->tx_count, 0);
	atomic_set(&lp->tx_ring_head, 0);
	lp->tx_ring_tail=0;
}


/**
 *	mc32_open	-	handle 'up' of card
 *	@dev: device to open
 *
 *	The user is trying to bring the card into ready state. This requires
 *	a brief dialogue with the card. Firstly we enable interrupts and then
 *	'indications'. Without these enabled the card doesn't bother telling
 *	us what it has done. This had me puzzled for a week.
 *
 *	We configure the number of card descriptors, then load the network
 *	address and multicast filters. Turn on the workaround mode. This
 *	works around a bug in the 82586 - it asks the firmware to do
 *	so. It has a performance (latency) hit but is needed on busy
 *	[read most] lans. We load the ring with buffers then we kick it
 *	all off.
 */

static int mc32_open(struct net_device *dev)
{
	int ioaddr = dev->base_addr;
	struct mc32_local *lp = netdev_priv(dev);
	u8 one=1;
	u8 regs;
	u16 descnumbuffs[2] = {TX_RING_LEN, RX_RING_LEN};

	/*
	 *	Interrupts enabled
	 */

	regs=inb(ioaddr+HOST_CTRL);
	regs|=HOST_CTRL_INTE;
	outb(regs, ioaddr+HOST_CTRL);

	/*
	 *      Allow ourselves to issue commands
	 */

	up(&lp->cmd_mutex);


	/*
	 *	Send the indications on command
	 */

	mc32_command(dev, 4, &one, 2);

	/*
	 *	Poke it to make sure it's really dead.
	 */

	mc32_halt_transceiver(dev);
	mc32_flush_tx_ring(dev);

	/*
	 *	Ask card to set up on-card descriptors to our spec
	 */

	if(mc32_command(dev, 8, descnumbuffs, 4)) {
		pr_info("%s: %s rejected our buffer configuration!\n",
	 	       dev->name, cardname);
		mc32_close(dev);
		return -ENOBUFS;
	}

	/* Report new configuration */
	mc32_command(dev, 6, NULL, 0);

	lp->tx_chain 		= lp->exec_box->data[8];   /* Transmit list start offset */
	lp->rx_chain 		= lp->exec_box->data[10];  /* Receive list start offset */
	lp->tx_len 		= lp->exec_box->data[9];   /* Transmit list count */
	lp->rx_len 		= lp->exec_box->data[11];  /* Receive list count */

	/* Set Network Address */
	mc32_command(dev, 1, dev->dev_addr, 6);

	/* Set the filters */
	mc32_set_multicast_list(dev);

	if (WORKAROUND_82586) {
		u16 zero_word=0;
		mc32_command(dev, 0x0D, &zero_word, 2);   /* 82586 bug workaround on  */
	}

	mc32_load_tx_ring(dev);

	if(mc32_load_rx_ring(dev))
	{
		mc32_close(dev);
		return -ENOBUFS;
	}

	lp->xceiver_desired_state = RUNNING;

	/* And finally, set the ball rolling... */
	mc32_start_transceiver(dev);

	netif_start_queue(dev);

	return 0;
}


/**
 *	mc32_timeout	-	handle a timeout from the network layer
 *	@dev: 3c527 that timed out
 *
 *	Handle a timeout on transmit from the 3c527. This normally means
 *	bad things as the hardware handles cable timeouts and mess for
 *	us.
 *
 */

static void mc32_timeout(struct net_device *dev)
{
	pr_warning("%s: transmit timed out?\n", dev->name);
	/* Try to restart the adaptor. */
	netif_wake_queue(dev);
}


/**
 *	mc32_send_packet	-	queue a frame for transmit
 *	@skb: buffer to transmit
 *	@dev: 3c527 to send it out of
 *
 *	Transmit a buffer. This normally means throwing the buffer onto
 *	the transmit queue as the queue is quite large. If the queue is
 *	full then we set tx_busy and return. Once the interrupt handler
 *	gets messages telling it to reclaim transmit queue entries, we will
 *	clear tx_busy and the kernel will start calling this again.
 *
 *      We do not disable interrupts or acquire any locks; this can
 *      run concurrently with mc32_tx_ring(), and the function itself
 *      is serialised at a higher layer. However, similarly for the
 *      card itself, we must ensure that we update tx_ring_head only
 *      after we've established a valid packet on the tx ring (and
 *      before we let the card "see" it, to prevent it racing with the
 *      irq handler).
 *
 */

static netdev_tx_t mc32_send_packet(struct sk_buff *skb,
				    struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	u32 head = atomic_read(&lp->tx_ring_head);

	volatile struct skb_header *p, *np;

	netif_stop_queue(dev);

	if(atomic_read(&lp->tx_count)==0) {
		return NETDEV_TX_BUSY;
	}

	if (skb_padto(skb, ETH_ZLEN)) {
		netif_wake_queue(dev);
		return NETDEV_TX_OK;
	}

	atomic_dec(&lp->tx_count);

	/* P is the last sending/sent buffer as a pointer */
	p=lp->tx_ring[head].p;

	head = next_tx(head);

	/* NP is the buffer we will be loading */
	np=lp->tx_ring[head].p;

	/* We will need this to flush the buffer out */
	lp->tx_ring[head].skb=skb;

	np->length      = unlikely(skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
	np->data	= isa_virt_to_bus(skb->data);
	np->status	= 0;
	np->control     = CONTROL_EOP | CONTROL_EOL;
	wmb();

	/*
	 * The new frame has been setup; we can now
	 * let the interrupt handler and card "see" it
	 */

	atomic_set(&lp->tx_ring_head, head);
	p->control     &= ~CONTROL_EOL;

	netif_wake_queue(dev);
	return NETDEV_TX_OK;
}


/**
 *	mc32_update_stats	-	pull off the on board statistics
 *	@dev: 3c527 to service
 *
 *
 *	Query and reset the on-card stats. There's the small possibility
 *	of a race here, which would result in an underestimation of
 *	actual errors. As such, we'd prefer to keep all our stats
 *	collection in software. As a rule, we do. However it can't be
 *	used for rx errors and collisions as, by default, the card discards
 *	bad rx packets.
 *
 *	Setting the SAV BP in the rx filter command supposedly
 *	stops this behaviour. However, testing shows that it only seems to
 *	enable the collation of on-card rx statistics --- the driver
 *	never sees an RX descriptor with an error status set.
 *
 */

static void mc32_update_stats(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	volatile struct mc32_stats *st = lp->stats;

	u32 rx_errors=0;

	rx_errors+=dev->stats.rx_crc_errors   +=st->rx_crc_errors;
	                                           st->rx_crc_errors=0;
	rx_errors+=dev->stats.rx_fifo_errors  +=st->rx_overrun_errors;
	                                           st->rx_overrun_errors=0;
	rx_errors+=dev->stats.rx_frame_errors +=st->rx_alignment_errors;
 	                                           st->rx_alignment_errors=0;
	rx_errors+=dev->stats.rx_length_errors+=st->rx_tooshort_errors;
	                                           st->rx_tooshort_errors=0;
	rx_errors+=dev->stats.rx_missed_errors+=st->rx_outofresource_errors;
	                                           st->rx_outofresource_errors=0;
        dev->stats.rx_errors=rx_errors;

	/* Number of packets which saw one collision */
	dev->stats.collisions+=st->dataC[10];
	st->dataC[10]=0;

	/* Number of packets which saw 2--15 collisions */
	dev->stats.collisions+=st->dataC[11];
	st->dataC[11]=0;
}


/**
 *	mc32_rx_ring	-	process the receive ring
 *	@dev: 3c527 that needs its receive ring processing
 *
 *
 *	We have received one or more indications from the card that a
 *	receive has completed. The buffer ring thus contains dirty
 *	entries. We walk the ring by iterating over the circular rx_ring
 *	array, starting at the next dirty buffer (which happens to be the
 *	one we finished up at last time around).
 *
 *	For each completed packet, we will either copy it and pass it up
 * 	the stack or, if the packet is near MTU sized, we allocate
 *	another buffer and flip the old one up the stack.
 *
 *	We must succeed in keeping a buffer on the ring. If necessary we
 *	will toss a received packet rather than lose a ring entry. Once
 *	the first uncompleted descriptor is found, we move the
 *	End-Of-List bit to include the buffers just processed.
 *
 */

static void mc32_rx_ring(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	volatile struct skb_header *p;
	u16 rx_ring_tail;
	u16 rx_old_tail;
	int x=0;

	rx_old_tail = rx_ring_tail = lp->rx_ring_tail;

	do
	{
		p=lp->rx_ring[rx_ring_tail].p;

		if(!(p->status & (1<<7))) { /* Not COMPLETED */
			break;
		}
		if(p->status & (1<<6)) /* COMPLETED_OK */
		{

			u16 length=p->length;
			struct sk_buff *skb;
			struct sk_buff *newskb;

			/* Try to save time by avoiding a copy on big frames */

			if ((length > RX_COPYBREAK) &&
			    ((newskb = netdev_alloc_skb(dev, 1532)) != NULL))
			{
				skb=lp->rx_ring[rx_ring_tail].skb;
				skb_put(skb, length);

				skb_reserve(newskb,18);
				lp->rx_ring[rx_ring_tail].skb=newskb;
				p->data=isa_virt_to_bus(newskb->data);
			}
			else
			{
				skb = netdev_alloc_skb(dev, length + 2);

				if(skb==NULL) {
					dev->stats.rx_dropped++;
					goto dropped;
				}

				skb_reserve(skb,2);
				memcpy(skb_put(skb, length),
				       lp->rx_ring[rx_ring_tail].skb->data, length);
			}

			skb->protocol=eth_type_trans(skb,dev);
 			dev->stats.rx_packets++;
 			dev->stats.rx_bytes += length;
			netif_rx(skb);
		}

	dropped:
		p->length = 1532;
		p->status = 0;

		rx_ring_tail=next_rx(rx_ring_tail);
	}
        while(x++<48);

	/* If there was actually a frame to be processed, place the EOL bit */
	/* at the descriptor prior to the one to be filled next */

	if (rx_ring_tail != rx_old_tail)
	{
		lp->rx_ring[prev_rx(rx_ring_tail)].p->control |=  CONTROL_EOL;
		lp->rx_ring[prev_rx(rx_old_tail)].p->control  &= ~CONTROL_EOL;

		lp->rx_ring_tail=rx_ring_tail;
	}
}


/**
 *	mc32_tx_ring	-	process completed transmits
 *	@dev: 3c527 that needs its transmit ring processing
 *
 *
 *	This operates in a similar fashion to mc32_rx_ring. We iterate
 *	over the transmit ring. For each descriptor which has been
 *	processed by the card, we free its associated buffer and note
 *	any errors. This continues until the transmit ring is emptied
 *	or we reach a descriptor that hasn't yet been processed by the
 *	card.
 *
 */

static void mc32_tx_ring(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	volatile struct skb_header *np;

	/*
	 * We rely on head==tail to mean 'queue empty'.
	 * This is why lp->tx_count=TX_RING_LEN-1: in order to prevent
	 * tx_ring_head wrapping to tail and confusing a 'queue empty'
	 * condition with 'queue full'
	 */

	while (lp->tx_ring_tail != atomic_read(&lp->tx_ring_head))
	{
		u16 t;

		t=next_tx(lp->tx_ring_tail);
		np=lp->tx_ring[t].p;

		if(!(np->status & (1<<7)))
		{
			/* Not COMPLETED */
			break;
		}
		dev->stats.tx_packets++;
		if(!(np->status & (1<<6))) /* Not COMPLETED_OK */
		{
			dev->stats.tx_errors++;

			switch(np->status&0x0F)
			{
				case 1:
					dev->stats.tx_aborted_errors++;
					break; /* Max collisions */
				case 2:
					dev->stats.tx_fifo_errors++;
					break;
				case 3:
					dev->stats.tx_carrier_errors++;
					break;
				case 4:
					dev->stats.tx_window_errors++;
					break;  /* CTS Lost */
				case 5:
					dev->stats.tx_aborted_errors++;
					break; /* Transmit timeout */
			}
		}
		/* Packets are sent in order - this is
		    basically a FIFO queue of buffers matching
		    the card ring */
		dev->stats.tx_bytes+=lp->tx_ring[t].skb->len;
		dev_kfree_skb_irq(lp->tx_ring[t].skb);
		lp->tx_ring[t].skb=NULL;
		atomic_inc(&lp->tx_count);
		netif_wake_queue(dev);

		lp->tx_ring_tail=t;
	}

}


/**
 *	mc32_interrupt		-	handle an interrupt from a 3c527
 *	@irq: Interrupt number
 *	@dev_id: 3c527 that requires servicing
 *	@regs: Registers (unused)
 *
 *
 *	An interrupt is raised whenever the 3c527 writes to the command
 *	register. This register contains the message it wishes to send us
 *	packed into a single byte field. We keep reading status entries
 *	until we have processed all the control items, but simply count
 *	transmit and receive reports. When all reports are in we empty the
 *	transceiver rings as appropriate. This saves the overhead of
 *	multiple command requests.
 *
 *	Because MCA is level-triggered, we shouldn't miss indications.
 *	Therefore, we needn't ask the card to suspend interrupts within
 *	this handler. The card receives an implicit acknowledgment of the
 *	current interrupt when we read the command register.
 *
 */

static irqreturn_t mc32_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct mc32_local *lp;
	int ioaddr, status, boguscount = 0;
	int rx_event = 0;
	int tx_event = 0;

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

	/* See whats cooking */

	while((inb(ioaddr+HOST_STATUS)&HOST_STATUS_CWR) && boguscount++<2000)
	{
		status=inb(ioaddr+HOST_CMD);

		pr_debug("Status TX%d RX%d EX%d OV%d BC%d\n",
			(status&7), (status>>3)&7, (status>>6)&1,
			(status>>7)&1, boguscount);

		switch(status&7)
		{
			case 0:
				break;
			case 6: /* TX fail */
			case 2:	/* TX ok */
				tx_event = 1;
				break;
			case 3: /* Halt */
			case 4: /* Abort */
				complete(&lp->xceiver_cmd);
				break;
			default:
				pr_notice("%s: strange tx ack %d\n", dev->name, status&7);
		}
		status>>=3;
		switch(status&7)
		{
			case 0:
				break;
			case 2:	/* RX */
				rx_event=1;
				break;
			case 3: /* Halt */
			case 4: /* Abort */
				complete(&lp->xceiver_cmd);
				break;
			case 6:
				/* Out of RX buffers stat */
				/* Must restart rx */
				dev->stats.rx_dropped++;
				mc32_rx_ring(dev);
				mc32_start_transceiver(dev);
				break;
			default:
				pr_notice("%s: strange rx ack %d\n",
					dev->name, status&7);
		}
		status>>=3;
		if(status&1)
		{
			/*
			 * No thread is waiting: we need to tidy
			 * up ourself.
			 */

			if (lp->cmd_nonblocking) {
				up(&lp->cmd_mutex);
				if (lp->mc_reload_wait)
					mc32_reset_multicast_list(dev);
			}
			else complete(&lp->execution_cmd);
		}
		if(status&2)
		{
			/*
			 *	We get interrupted once per
			 *	counter that is about to overflow.
			 */

			mc32_update_stats(dev);
		}
	}


	/*
	 *	Process the transmit and receive rings
         */

	if(tx_event)
		mc32_tx_ring(dev);

	if(rx_event)
		mc32_rx_ring(dev);

	return IRQ_HANDLED;
}


/**
 *	mc32_close	-	user configuring the 3c527 down
 *	@dev: 3c527 card to shut down
 *
 *	The 3c527 is a bus mastering device. We must be careful how we
 *	shut it down. It may also be running shared interrupt so we have
 *	to be sure to silence it properly
 *
 *	We indicate that the card is closing to the rest of the
 *	driver.  Otherwise, it is possible that the card may run out
 *	of receive buffers and restart the transceiver while we're
 *	trying to close it.
 *
 *	We abort any receive and transmits going on and then wait until
 *	any pending exec commands have completed in other code threads.
 *	In theory we can't get here while that is true, in practice I am
 *	paranoid
 *
 *	We turn off the interrupt enable for the board to be sure it can't
 *	intefere with other devices.
 */

static int mc32_close(struct net_device *dev)
{
	struct mc32_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	u8 regs;
	u16 one=1;

	lp->xceiver_desired_state = HALTED;
	netif_stop_queue(dev);

	/*
	 *	Send the indications on command (handy debug check)
	 */

	mc32_command(dev, 4, &one, 2);

	/* Shut down the transceiver */

	mc32_halt_transceiver(dev);

	/* Ensure we issue no more commands beyond this point */

	down(&lp->cmd_mutex);

	/* Ok the card is now stopping */

	regs=inb(ioaddr+HOST_CTRL);
	regs&=~HOST_CTRL_INTE;
	outb(regs, ioaddr+HOST_CTRL);

	mc32_flush_rx_ring(dev);
	mc32_flush_tx_ring(dev);

	mc32_update_stats(dev);

	return 0;
}


/**
 *	mc32_get_stats		-	hand back stats to network layer
 *	@dev: The 3c527 card to handle
 *
 *	We've collected all the stats we can in software already. Now
 *	it's time to update those kept on-card and return the lot.
 *
 */

static struct net_device_stats *mc32_get_stats(struct net_device *dev)
{
	mc32_update_stats(dev);
	return &dev->stats;
}


/**
 *	do_mc32_set_multicast_list	-	attempt to update multicasts
 *	@dev: 3c527 device to load the list on
 *	@retry: indicates this is not the first call.
 *
 *
 * 	Actually set or clear the multicast filter for this adaptor. The
 *	locking issues are handled by this routine. We have to track
 *	state as it may take multiple calls to get the command sequence
 *	completed. We just keep trying to schedule the loads until we
 *	manage to process them all.
 *
 *	num_addrs == -1	Promiscuous mode, receive all packets
 *
 *	num_addrs == 0	Normal mode, clear multicast list
 *
 *	num_addrs > 0	Multicast mode, receive normal and MC packets,
 *			and do best-effort filtering.
 *
 *	See mc32_update_stats() regards setting the SAV BP bit.
 *
 */

static void do_mc32_set_multicast_list(struct net_device *dev, int retry)
{
	struct mc32_local *lp = netdev_priv(dev);
	u16 filt = (1<<2); /* Save Bad Packets, for stats purposes */

	if ((dev->flags&IFF_PROMISC) ||
	    (dev->flags&IFF_ALLMULTI) ||
	    netdev_mc_count(dev) > 10)
		/* Enable promiscuous mode */
		filt |= 1;
	else if (!netdev_mc_empty(dev))
	{
		unsigned char block[62];
		unsigned char *bp;
		struct netdev_hw_addr *ha;

		if(retry==0)
			lp->mc_list_valid = 0;
		if(!lp->mc_list_valid)
		{
			block[1]=0;
			block[0]=netdev_mc_count(dev);
			bp=block+2;

			netdev_for_each_mc_addr(ha, dev) {
				memcpy(bp, ha->addr, 6);
				bp+=6;
			}
			if(mc32_command_nowait(dev, 2, block,
					       2+6*netdev_mc_count(dev))==-1)
			{
				lp->mc_reload_wait = 1;
				return;
			}
			lp->mc_list_valid=1;
		}
	}

	if(mc32_command_nowait(dev, 0, &filt, 2)==-1)
	{
		lp->mc_reload_wait = 1;
	}
	else {
		lp->mc_reload_wait = 0;
	}
}


/**
 *	mc32_set_multicast_list	-	queue multicast list update
 *	@dev: The 3c527 to use
 *
 *	Commence loading the multicast list. This is called when the kernel
 *	changes the lists. It will override any pending list we are trying to
 *	load.
 */

static void mc32_set_multicast_list(struct net_device *dev)
{
	do_mc32_set_multicast_list(dev,0);
}


/**
 *	mc32_reset_multicast_list	-	reset multicast list
 *	@dev: The 3c527 to use
 *
 *	Attempt the next step in loading the multicast lists. If this attempt
 *	fails to complete then it will be scheduled and this function called
 *	again later from elsewhere.
 */

static void mc32_reset_multicast_list(struct net_device *dev)
{
	do_mc32_set_multicast_list(dev,1);
}

static void netdev_get_drvinfo(struct net_device *dev,
			       struct ethtool_drvinfo *info)
{
	strcpy(info->driver, DRV_NAME);
	strcpy(info->version, DRV_VERSION);
	sprintf(info->bus_info, "MCA 0x%lx", dev->base_addr);
}

static u32 netdev_get_msglevel(struct net_device *dev)
{
	return mc32_debug;
}

static void netdev_set_msglevel(struct net_device *dev, u32 level)
{
	mc32_debug = level;
}

static const struct ethtool_ops netdev_ethtool_ops = {
	.get_drvinfo		= netdev_get_drvinfo,
	.get_msglevel		= netdev_get_msglevel,
	.set_msglevel		= netdev_set_msglevel,
};

#ifdef MODULE

static struct net_device *this_device;

/**
 *	init_module		-	entry point
 *
 *	Probe and locate a 3c527 card. This really should probe and locate
 *	all the 3c527 cards in the machine not just one of them. Yes you can
 *	insmod multiple modules for now but it's a hack.
 */

int __init init_module(void)
{
	this_device = mc32_probe(-1);
	if (IS_ERR(this_device))
		return PTR_ERR(this_device);
	return 0;
}

/**
 *	cleanup_module	-	free resources for an unload
 *
 *	Unloading time. We release the MCA bus resources and the interrupt
 *	at which point everything is ready to unload. The card must be stopped
 *	at this point or we would not have been called. When we unload we
 *	leave the card stopped but not totally shut down. When the card is
 *	initialized it must be rebooted or the rings reloaded before any
 *	transmit operations are allowed to start scribbling into memory.
 */

void __exit cleanup_module(void)
{
	unregister_netdev(this_device);
	cleanup_card(this_device);
	free_netdev(this_device);
}

#endif /* MODULE */