summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/amd/sunlance.c
blob: fef236f576707b31c158ba3eb4bcaa2b3e1f5bc8 (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
// SPDX-License-Identifier: GPL-2.0-only
/* $Id: sunlance.c,v 1.112 2002/01/15 06:48:55 davem Exp $
 * lance.c: Linux/Sparc/Lance driver
 *
 *	Written 1995, 1996 by Miguel de Icaza
 * Sources:
 *	The Linux  depca driver
 *	The Linux  lance driver.
 *	The Linux  skeleton driver.
 *	The NetBSD Sparc/Lance driver.
 *	Theo de Raadt (deraadt@openbsd.org)
 *	NCR92C990 Lan Controller manual
 *
 * 1.4:
 *	Added support to run with a ledma on the Sun4m
 *
 * 1.5:
 *	Added multiple card detection.
 *
 *	 4/17/96: Burst sizes and tpe selection on sun4m by Eddie C. Dost
 *		  (ecd@skynet.be)
 *
 *	 5/15/96: auto carrier detection on sun4m by Eddie C. Dost
 *		  (ecd@skynet.be)
 *
 *	 5/17/96: lebuffer on scsi/ether cards now work David S. Miller
 *		  (davem@caip.rutgers.edu)
 *
 *	 5/29/96: override option 'tpe-link-test?', if it is 'false', as
 *		  this disables auto carrier detection on sun4m. Eddie C. Dost
 *		  (ecd@skynet.be)
 *
 * 1.7:
 *	 6/26/96: Bug fix for multiple ledmas, miguel.
 *
 * 1.8:
 *		  Stole multicast code from depca.c, fixed lance_tx.
 *
 * 1.9:
 *	 8/21/96: Fixed the multicast code (Pedro Roque)
 *
 *	 8/28/96: Send fake packet in lance_open() if auto_select is true,
 *		  so we can detect the carrier loss condition in time.
 *		  Eddie C. Dost (ecd@skynet.be)
 *
 *	 9/15/96: Align rx_buf so that eth_copy_and_sum() won't cause an
 *		  MNA trap during chksum_partial_copy(). (ecd@skynet.be)
 *
 *	11/17/96: Handle LE_C0_MERR in lance_interrupt(). (ecd@skynet.be)
 *
 *	12/22/96: Don't loop forever in lance_rx() on incomplete packets.
 *		  This was the sun4c killer. Shit, stupid bug.
 *		  (ecd@skynet.be)
 *
 * 1.10:
 *	 1/26/97: Modularize driver. (ecd@skynet.be)
 *
 * 1.11:
 *	12/27/97: Added sun4d support. (jj@sunsite.mff.cuni.cz)
 *
 * 1.12:
 * 	 11/3/99: Fixed SMP race in lance_start_xmit found by davem.
 * 	          Anton Blanchard (anton@progsoc.uts.edu.au)
 * 2.00: 11/9/99: Massive overhaul and port to new SBUS driver interfaces.
 *		  David S. Miller (davem@redhat.com)
 * 2.01:
 *      11/08/01: Use library crc32 functions (Matt_Domsch@dell.com)
 *
 */

#undef DEBUG_DRIVER

static char lancestr[] = "LANCE";

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/crc32.h>
#include <linux/errno.h>
#include <linux/socket.h> /* Used for the temporal inet entries and routing */
#include <linux/route.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/gfp.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <linux/pgtable.h>
#include <asm/byteorder.h>	/* Used by the checksum routines */
#include <asm/idprom.h>
#include <asm/prom.h>
#include <asm/auxio.h>		/* For tpe-link-test? setting */
#include <asm/irq.h>

#define DRV_NAME	"sunlance"
#define DRV_RELDATE	"8/24/03"
#define DRV_AUTHOR	"Miguel de Icaza (miguel@nuclecu.unam.mx)"

MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION("Sun Lance ethernet driver");
MODULE_LICENSE("GPL");

/* Define: 2^4 Tx buffers and 2^4 Rx buffers */
#ifndef LANCE_LOG_TX_BUFFERS
#define LANCE_LOG_TX_BUFFERS 4
#define LANCE_LOG_RX_BUFFERS 4
#endif

#define LE_CSR0 0
#define LE_CSR1 1
#define LE_CSR2 2
#define LE_CSR3 3

#define LE_MO_PROM      0x8000  /* Enable promiscuous mode */

#define	LE_C0_ERR	0x8000	/* Error: set if BAB, SQE, MISS or ME is set */
#define	LE_C0_BABL	0x4000	/* BAB:  Babble: tx timeout. */
#define	LE_C0_CERR	0x2000	/* SQE:  Signal quality error */
#define	LE_C0_MISS	0x1000	/* MISS: Missed a packet */
#define	LE_C0_MERR	0x0800	/* ME:   Memory error */
#define	LE_C0_RINT	0x0400	/* Received interrupt */
#define	LE_C0_TINT	0x0200	/* Transmitter Interrupt */
#define	LE_C0_IDON	0x0100	/* IFIN: Init finished. */
#define	LE_C0_INTR	0x0080	/* Interrupt or error */
#define	LE_C0_INEA	0x0040	/* Interrupt enable */
#define	LE_C0_RXON	0x0020	/* Receiver on */
#define	LE_C0_TXON	0x0010	/* Transmitter on */
#define	LE_C0_TDMD	0x0008	/* Transmitter demand */
#define	LE_C0_STOP	0x0004	/* Stop the card */
#define	LE_C0_STRT	0x0002	/* Start the card */
#define	LE_C0_INIT	0x0001	/* Init the card */

#define	LE_C3_BSWP	0x4     /* SWAP */
#define	LE_C3_ACON	0x2	/* ALE Control */
#define	LE_C3_BCON	0x1	/* Byte control */

/* Receive message descriptor 1 */
#define LE_R1_OWN       0x80    /* Who owns the entry */
#define LE_R1_ERR       0x40    /* Error: if FRA, OFL, CRC or BUF is set */
#define LE_R1_FRA       0x20    /* FRA: Frame error */
#define LE_R1_OFL       0x10    /* OFL: Frame overflow */
#define LE_R1_CRC       0x08    /* CRC error */
#define LE_R1_BUF       0x04    /* BUF: Buffer error */
#define LE_R1_SOP       0x02    /* Start of packet */
#define LE_R1_EOP       0x01    /* End of packet */
#define LE_R1_POK       0x03    /* Packet is complete: SOP + EOP */

#define LE_T1_OWN       0x80    /* Lance owns the packet */
#define LE_T1_ERR       0x40    /* Error summary */
#define LE_T1_EMORE     0x10    /* Error: more than one retry needed */
#define LE_T1_EONE      0x08    /* Error: one retry needed */
#define LE_T1_EDEF      0x04    /* Error: deferred */
#define LE_T1_SOP       0x02    /* Start of packet */
#define LE_T1_EOP       0x01    /* End of packet */
#define LE_T1_POK	0x03	/* Packet is complete: SOP + EOP */

#define LE_T3_BUF       0x8000  /* Buffer error */
#define LE_T3_UFL       0x4000  /* Error underflow */
#define LE_T3_LCOL      0x1000  /* Error late collision */
#define LE_T3_CLOS      0x0800  /* Error carrier loss */
#define LE_T3_RTY       0x0400  /* Error retry */
#define LE_T3_TDR       0x03ff  /* Time Domain Reflectometry counter */

#define TX_RING_SIZE			(1 << (LANCE_LOG_TX_BUFFERS))
#define TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
#define TX_RING_LEN_BITS		((LANCE_LOG_TX_BUFFERS) << 29)
#define TX_NEXT(__x)			(((__x)+1) & TX_RING_MOD_MASK)

#define RX_RING_SIZE			(1 << (LANCE_LOG_RX_BUFFERS))
#define RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
#define RX_RING_LEN_BITS		((LANCE_LOG_RX_BUFFERS) << 29)
#define RX_NEXT(__x)			(((__x)+1) & RX_RING_MOD_MASK)

#define PKT_BUF_SZ		1544
#define RX_BUFF_SIZE            PKT_BUF_SZ
#define TX_BUFF_SIZE            PKT_BUF_SZ

struct lance_rx_desc {
	u16	rmd0;		/* low address of packet */
	u8	rmd1_bits;	/* descriptor bits */
	u8	rmd1_hadr;	/* high address of packet */
	s16	length;		/* This length is 2s complement (negative)!
				 * Buffer length
				 */
	u16	mblength;	/* This is the actual number of bytes received */
};

struct lance_tx_desc {
	u16	tmd0;		/* low address of packet */
	u8 	tmd1_bits;	/* descriptor bits */
	u8 	tmd1_hadr;	/* high address of packet */
	s16 	length;		/* Length is 2s complement (negative)! */
	u16 	misc;
};

/* The LANCE initialization block, described in databook. */
/* On the Sparc, this block should be on a DMA region     */
struct lance_init_block {
	u16	mode;		/* Pre-set mode (reg. 15) */
	u8	phys_addr[6];	/* Physical ethernet address */
	u32	filter[2];	/* Multicast filter. */

	/* Receive and transmit ring base, along with extra bits. */
	u16	rx_ptr;		/* receive descriptor addr */
	u16	rx_len;		/* receive len and high addr */
	u16	tx_ptr;		/* transmit descriptor addr */
	u16	tx_len;		/* transmit len and high addr */

	/* The Tx and Rx ring entries must aligned on 8-byte boundaries. */
	struct lance_rx_desc brx_ring[RX_RING_SIZE];
	struct lance_tx_desc btx_ring[TX_RING_SIZE];

	u8	tx_buf [TX_RING_SIZE][TX_BUFF_SIZE];
	u8	pad[2];		/* align rx_buf for copy_and_sum(). */
	u8	rx_buf [RX_RING_SIZE][RX_BUFF_SIZE];
};

#define libdesc_offset(rt, elem) \
((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem])))))

#define libbuff_offset(rt, elem) \
((__u32)(((unsigned long)(&(((struct lance_init_block *)0)->rt[elem][0])))))

struct lance_private {
	void __iomem	*lregs;		/* Lance RAP/RDP regs.		*/
	void __iomem	*dregs;		/* DMA controller regs.		*/
	struct lance_init_block __iomem *init_block_iomem;
	struct lance_init_block *init_block_mem;

	spinlock_t	lock;

	int		rx_new, tx_new;
	int		rx_old, tx_old;

	struct platform_device *ledma;	/* If set this points to ledma	*/
	char		tpe;		/* cable-selection is TPE	*/
	char		auto_select;	/* cable-selection by carrier	*/
	char		burst_sizes;	/* ledma SBus burst sizes	*/
	char		pio_buffer;	/* init block in PIO space?	*/

	unsigned short	busmaster_regval;

	void (*init_ring)(struct net_device *);
	void (*rx)(struct net_device *);
	void (*tx)(struct net_device *);

	char	       	       *name;
	dma_addr_t		init_block_dvma;
	struct net_device      *dev;		  /* Backpointer	*/
	struct platform_device       *op;
	struct platform_device       *lebuffer;
	struct timer_list       multicast_timer;
};

#define TX_BUFFS_AVAIL ((lp->tx_old<=lp->tx_new)?\
			lp->tx_old+TX_RING_MOD_MASK-lp->tx_new:\
			lp->tx_old - lp->tx_new-1)

/* Lance registers. */
#define RDP		0x00UL		/* register data port		*/
#define RAP		0x02UL		/* register address port	*/
#define LANCE_REG_SIZE	0x04UL

#define STOP_LANCE(__lp) \
do {	void __iomem *__base = (__lp)->lregs; \
	sbus_writew(LE_CSR0,	__base + RAP); \
	sbus_writew(LE_C0_STOP,	__base + RDP); \
} while (0)

int sparc_lance_debug = 2;

/* The Lance uses 24 bit addresses */
/* On the Sun4c the DVMA will provide the remaining bytes for us */
/* On the Sun4m we have to instruct the ledma to provide them    */
/* Even worse, on scsi/ether SBUS cards, the init block and the
 * transmit/receive buffers are addresses as offsets from absolute
 * zero on the lebuffer PIO area. -DaveM
 */

#define LANCE_ADDR(x) ((long)(x) & ~0xff000000)

/* Load the CSR registers */
static void load_csrs(struct lance_private *lp)
{
	u32 leptr;

	if (lp->pio_buffer)
		leptr = 0;
	else
		leptr = LANCE_ADDR(lp->init_block_dvma);

	sbus_writew(LE_CSR1,		  lp->lregs + RAP);
	sbus_writew(leptr & 0xffff,	  lp->lregs + RDP);
	sbus_writew(LE_CSR2,		  lp->lregs + RAP);
	sbus_writew(leptr >> 16,	  lp->lregs + RDP);
	sbus_writew(LE_CSR3,		  lp->lregs + RAP);
	sbus_writew(lp->busmaster_regval, lp->lregs + RDP);

	/* Point back to csr0 */
	sbus_writew(LE_CSR0, lp->lregs + RAP);
}

/* Setup the Lance Rx and Tx rings */
static void lance_init_ring_dvma(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct lance_init_block *ib = lp->init_block_mem;
	dma_addr_t aib = lp->init_block_dvma;
	__u32 leptr;
	int i;

	/* Lock out other processes while setting up hardware */
	netif_stop_queue(dev);
	lp->rx_new = lp->tx_new = 0;
	lp->rx_old = lp->tx_old = 0;

	/* Copy the ethernet address to the lance init block
	 * Note that on the sparc you need to swap the ethernet address.
	 */
	ib->phys_addr [0] = dev->dev_addr [1];
	ib->phys_addr [1] = dev->dev_addr [0];
	ib->phys_addr [2] = dev->dev_addr [3];
	ib->phys_addr [3] = dev->dev_addr [2];
	ib->phys_addr [4] = dev->dev_addr [5];
	ib->phys_addr [5] = dev->dev_addr [4];

	/* Setup the Tx ring entries */
	for (i = 0; i < TX_RING_SIZE; i++) {
		leptr = LANCE_ADDR(aib + libbuff_offset(tx_buf, i));
		ib->btx_ring [i].tmd0      = leptr;
		ib->btx_ring [i].tmd1_hadr = leptr >> 16;
		ib->btx_ring [i].tmd1_bits = 0;
		ib->btx_ring [i].length    = 0xf000; /* The ones required by tmd2 */
		ib->btx_ring [i].misc      = 0;
	}

	/* Setup the Rx ring entries */
	for (i = 0; i < RX_RING_SIZE; i++) {
		leptr = LANCE_ADDR(aib + libbuff_offset(rx_buf, i));

		ib->brx_ring [i].rmd0      = leptr;
		ib->brx_ring [i].rmd1_hadr = leptr >> 16;
		ib->brx_ring [i].rmd1_bits = LE_R1_OWN;
		ib->brx_ring [i].length    = -RX_BUFF_SIZE | 0xf000;
		ib->brx_ring [i].mblength  = 0;
	}

	/* Setup the initialization block */

	/* Setup rx descriptor pointer */
	leptr = LANCE_ADDR(aib + libdesc_offset(brx_ring, 0));
	ib->rx_len = (LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16);
	ib->rx_ptr = leptr;

	/* Setup tx descriptor pointer */
	leptr = LANCE_ADDR(aib + libdesc_offset(btx_ring, 0));
	ib->tx_len = (LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16);
	ib->tx_ptr = leptr;
}

static void lance_init_ring_pio(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct lance_init_block __iomem *ib = lp->init_block_iomem;
	u32 leptr;
	int i;

	/* Lock out other processes while setting up hardware */
	netif_stop_queue(dev);
	lp->rx_new = lp->tx_new = 0;
	lp->rx_old = lp->tx_old = 0;

	/* Copy the ethernet address to the lance init block
	 * Note that on the sparc you need to swap the ethernet address.
	 */
	sbus_writeb(dev->dev_addr[1], &ib->phys_addr[0]);
	sbus_writeb(dev->dev_addr[0], &ib->phys_addr[1]);
	sbus_writeb(dev->dev_addr[3], &ib->phys_addr[2]);
	sbus_writeb(dev->dev_addr[2], &ib->phys_addr[3]);
	sbus_writeb(dev->dev_addr[5], &ib->phys_addr[4]);
	sbus_writeb(dev->dev_addr[4], &ib->phys_addr[5]);

	/* Setup the Tx ring entries */
	for (i = 0; i < TX_RING_SIZE; i++) {
		leptr = libbuff_offset(tx_buf, i);
		sbus_writew(leptr,	&ib->btx_ring [i].tmd0);
		sbus_writeb(leptr >> 16,&ib->btx_ring [i].tmd1_hadr);
		sbus_writeb(0,		&ib->btx_ring [i].tmd1_bits);

		/* The ones required by tmd2 */
		sbus_writew(0xf000,	&ib->btx_ring [i].length);
		sbus_writew(0,		&ib->btx_ring [i].misc);
	}

	/* Setup the Rx ring entries */
	for (i = 0; i < RX_RING_SIZE; i++) {
		leptr = libbuff_offset(rx_buf, i);

		sbus_writew(leptr,	&ib->brx_ring [i].rmd0);
		sbus_writeb(leptr >> 16,&ib->brx_ring [i].rmd1_hadr);
		sbus_writeb(LE_R1_OWN,	&ib->brx_ring [i].rmd1_bits);
		sbus_writew(-RX_BUFF_SIZE|0xf000,
			    &ib->brx_ring [i].length);
		sbus_writew(0,		&ib->brx_ring [i].mblength);
	}

	/* Setup the initialization block */

	/* Setup rx descriptor pointer */
	leptr = libdesc_offset(brx_ring, 0);
	sbus_writew((LANCE_LOG_RX_BUFFERS << 13) | (leptr >> 16),
		    &ib->rx_len);
	sbus_writew(leptr, &ib->rx_ptr);

	/* Setup tx descriptor pointer */
	leptr = libdesc_offset(btx_ring, 0);
	sbus_writew((LANCE_LOG_TX_BUFFERS << 13) | (leptr >> 16),
		    &ib->tx_len);
	sbus_writew(leptr, &ib->tx_ptr);
}

static void init_restart_ledma(struct lance_private *lp)
{
	u32 csr = sbus_readl(lp->dregs + DMA_CSR);

	if (!(csr & DMA_HNDL_ERROR)) {
		/* E-Cache draining */
		while (sbus_readl(lp->dregs + DMA_CSR) & DMA_FIFO_ISDRAIN)
			barrier();
	}

	csr = sbus_readl(lp->dregs + DMA_CSR);
	csr &= ~DMA_E_BURSTS;
	if (lp->burst_sizes & DMA_BURST32)
		csr |= DMA_E_BURST32;
	else
		csr |= DMA_E_BURST16;

	csr |= (DMA_DSBL_RD_DRN | DMA_DSBL_WR_INV | DMA_FIFO_INV);

	if (lp->tpe)
		csr |= DMA_EN_ENETAUI;
	else
		csr &= ~DMA_EN_ENETAUI;
	udelay(20);
	sbus_writel(csr, lp->dregs + DMA_CSR);
	udelay(200);
}

static int init_restart_lance(struct lance_private *lp)
{
	u16 regval = 0;
	int i;

	if (lp->dregs)
		init_restart_ledma(lp);

	sbus_writew(LE_CSR0,	lp->lregs + RAP);
	sbus_writew(LE_C0_INIT,	lp->lregs + RDP);

	/* Wait for the lance to complete initialization */
	for (i = 0; i < 100; i++) {
		regval = sbus_readw(lp->lregs + RDP);

		if (regval & (LE_C0_ERR | LE_C0_IDON))
			break;
		barrier();
	}
	if (i == 100 || (regval & LE_C0_ERR)) {
		printk(KERN_ERR "LANCE unopened after %d ticks, csr0=%4.4x.\n",
		       i, regval);
		if (lp->dregs)
			printk("dcsr=%8.8x\n", sbus_readl(lp->dregs + DMA_CSR));
		return -1;
	}

	/* Clear IDON by writing a "1", enable interrupts and start lance */
	sbus_writew(LE_C0_IDON,			lp->lregs + RDP);
	sbus_writew(LE_C0_INEA | LE_C0_STRT,	lp->lregs + RDP);

	if (lp->dregs) {
		u32 csr = sbus_readl(lp->dregs + DMA_CSR);

		csr |= DMA_INT_ENAB;
		sbus_writel(csr, lp->dregs + DMA_CSR);
	}

	return 0;
}

static void lance_rx_dvma(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct lance_init_block *ib = lp->init_block_mem;
	struct lance_rx_desc *rd;
	u8 bits;
	int len, entry = lp->rx_new;
	struct sk_buff *skb;

	for (rd = &ib->brx_ring [entry];
	     !((bits = rd->rmd1_bits) & LE_R1_OWN);
	     rd = &ib->brx_ring [entry]) {

		/* We got an incomplete frame? */
		if ((bits & LE_R1_POK) != LE_R1_POK) {
			dev->stats.rx_over_errors++;
			dev->stats.rx_errors++;
		} else if (bits & LE_R1_ERR) {
			/* Count only the end frame as a rx error,
			 * not the beginning
			 */
			if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
			if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
			if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
			if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
			if (bits & LE_R1_EOP) dev->stats.rx_errors++;
		} else {
			len = (rd->mblength & 0xfff) - 4;
			skb = netdev_alloc_skb(dev, len + 2);

			if (skb == NULL) {
				dev->stats.rx_dropped++;
				rd->mblength = 0;
				rd->rmd1_bits = LE_R1_OWN;
				lp->rx_new = RX_NEXT(entry);
				return;
			}

			dev->stats.rx_bytes += len;

			skb_reserve(skb, 2);		/* 16 byte align */
			skb_put(skb, len);		/* make room */
			skb_copy_to_linear_data(skb,
					 (unsigned char *)&(ib->rx_buf [entry][0]),
					 len);
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
			dev->stats.rx_packets++;
		}

		/* Return the packet to the pool */
		rd->mblength = 0;
		rd->rmd1_bits = LE_R1_OWN;
		entry = RX_NEXT(entry);
	}

	lp->rx_new = entry;
}

static void lance_tx_dvma(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct lance_init_block *ib = lp->init_block_mem;
	int i, j;

	spin_lock(&lp->lock);

	j = lp->tx_old;
	for (i = j; i != lp->tx_new; i = j) {
		struct lance_tx_desc *td = &ib->btx_ring [i];
		u8 bits = td->tmd1_bits;

		/* If we hit a packet not owned by us, stop */
		if (bits & LE_T1_OWN)
			break;

		if (bits & LE_T1_ERR) {
			u16 status = td->misc;

			dev->stats.tx_errors++;
			if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
			if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;

			if (status & LE_T3_CLOS) {
				dev->stats.tx_carrier_errors++;
				if (lp->auto_select) {
					lp->tpe = 1 - lp->tpe;
					printk(KERN_NOTICE "%s: Carrier Lost, trying %s\n",
					       dev->name, lp->tpe?"TPE":"AUI");
					STOP_LANCE(lp);
					lp->init_ring(dev);
					load_csrs(lp);
					init_restart_lance(lp);
					goto out;
				}
			}

			/* Buffer errors and underflows turn off the
			 * transmitter, restart the adapter.
			 */
			if (status & (LE_T3_BUF|LE_T3_UFL)) {
				dev->stats.tx_fifo_errors++;

				printk(KERN_ERR "%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
				       dev->name);
				STOP_LANCE(lp);
				lp->init_ring(dev);
				load_csrs(lp);
				init_restart_lance(lp);
				goto out;
			}
		} else if ((bits & LE_T1_POK) == LE_T1_POK) {
			/*
			 * So we don't count the packet more than once.
			 */
			td->tmd1_bits = bits & ~(LE_T1_POK);

			/* One collision before packet was sent. */
			if (bits & LE_T1_EONE)
				dev->stats.collisions++;

			/* More than one collision, be optimistic. */
			if (bits & LE_T1_EMORE)
				dev->stats.collisions += 2;

			dev->stats.tx_packets++;
		}

		j = TX_NEXT(j);
	}
	lp->tx_old = j;
out:
	if (netif_queue_stopped(dev) &&
	    TX_BUFFS_AVAIL > 0)
		netif_wake_queue(dev);

	spin_unlock(&lp->lock);
}

static void lance_piocopy_to_skb(struct sk_buff *skb, void __iomem *piobuf, int len)
{
	u16 *p16 = (u16 *) skb->data;
	u32 *p32;
	u8 *p8;
	void __iomem *pbuf = piobuf;

	/* We know here that both src and dest are on a 16bit boundary. */
	*p16++ = sbus_readw(pbuf);
	p32 = (u32 *) p16;
	pbuf += 2;
	len -= 2;

	while (len >= 4) {
		*p32++ = sbus_readl(pbuf);
		pbuf += 4;
		len -= 4;
	}
	p8 = (u8 *) p32;
	if (len >= 2) {
		p16 = (u16 *) p32;
		*p16++ = sbus_readw(pbuf);
		pbuf += 2;
		len -= 2;
		p8 = (u8 *) p16;
	}
	if (len >= 1)
		*p8 = sbus_readb(pbuf);
}

static void lance_rx_pio(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct lance_init_block __iomem *ib = lp->init_block_iomem;
	struct lance_rx_desc __iomem *rd;
	unsigned char bits;
	int len, entry;
	struct sk_buff *skb;

	entry = lp->rx_new;
	for (rd = &ib->brx_ring [entry];
	     !((bits = sbus_readb(&rd->rmd1_bits)) & LE_R1_OWN);
	     rd = &ib->brx_ring [entry]) {

		/* We got an incomplete frame? */
		if ((bits & LE_R1_POK) != LE_R1_POK) {
			dev->stats.rx_over_errors++;
			dev->stats.rx_errors++;
		} else if (bits & LE_R1_ERR) {
			/* Count only the end frame as a rx error,
			 * not the beginning
			 */
			if (bits & LE_R1_BUF) dev->stats.rx_fifo_errors++;
			if (bits & LE_R1_CRC) dev->stats.rx_crc_errors++;
			if (bits & LE_R1_OFL) dev->stats.rx_over_errors++;
			if (bits & LE_R1_FRA) dev->stats.rx_frame_errors++;
			if (bits & LE_R1_EOP) dev->stats.rx_errors++;
		} else {
			len = (sbus_readw(&rd->mblength) & 0xfff) - 4;
			skb = netdev_alloc_skb(dev, len + 2);

			if (skb == NULL) {
				dev->stats.rx_dropped++;
				sbus_writew(0, &rd->mblength);
				sbus_writeb(LE_R1_OWN, &rd->rmd1_bits);
				lp->rx_new = RX_NEXT(entry);
				return;
			}

			dev->stats.rx_bytes += len;

			skb_reserve (skb, 2);		/* 16 byte align */
			skb_put(skb, len);		/* make room */
			lance_piocopy_to_skb(skb, &(ib->rx_buf[entry][0]), len);
			skb->protocol = eth_type_trans(skb, dev);
			netif_rx(skb);
			dev->stats.rx_packets++;
		}

		/* Return the packet to the pool */
		sbus_writew(0, &rd->mblength);
		sbus_writeb(LE_R1_OWN, &rd->rmd1_bits);
		entry = RX_NEXT(entry);
	}

	lp->rx_new = entry;
}

static void lance_tx_pio(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct lance_init_block __iomem *ib = lp->init_block_iomem;
	int i, j;

	spin_lock(&lp->lock);

	j = lp->tx_old;
	for (i = j; i != lp->tx_new; i = j) {
		struct lance_tx_desc __iomem *td = &ib->btx_ring [i];
		u8 bits = sbus_readb(&td->tmd1_bits);

		/* If we hit a packet not owned by us, stop */
		if (bits & LE_T1_OWN)
			break;

		if (bits & LE_T1_ERR) {
			u16 status = sbus_readw(&td->misc);

			dev->stats.tx_errors++;
			if (status & LE_T3_RTY)  dev->stats.tx_aborted_errors++;
			if (status & LE_T3_LCOL) dev->stats.tx_window_errors++;

			if (status & LE_T3_CLOS) {
				dev->stats.tx_carrier_errors++;
				if (lp->auto_select) {
					lp->tpe = 1 - lp->tpe;
					printk(KERN_NOTICE "%s: Carrier Lost, trying %s\n",
					       dev->name, lp->tpe?"TPE":"AUI");
					STOP_LANCE(lp);
					lp->init_ring(dev);
					load_csrs(lp);
					init_restart_lance(lp);
					goto out;
				}
			}

			/* Buffer errors and underflows turn off the
			 * transmitter, restart the adapter.
			 */
			if (status & (LE_T3_BUF|LE_T3_UFL)) {
				dev->stats.tx_fifo_errors++;

				printk(KERN_ERR "%s: Tx: ERR_BUF|ERR_UFL, restarting\n",
				       dev->name);
				STOP_LANCE(lp);
				lp->init_ring(dev);
				load_csrs(lp);
				init_restart_lance(lp);
				goto out;
			}
		} else if ((bits & LE_T1_POK) == LE_T1_POK) {
			/*
			 * So we don't count the packet more than once.
			 */
			sbus_writeb(bits & ~(LE_T1_POK), &td->tmd1_bits);

			/* One collision before packet was sent. */
			if (bits & LE_T1_EONE)
				dev->stats.collisions++;

			/* More than one collision, be optimistic. */
			if (bits & LE_T1_EMORE)
				dev->stats.collisions += 2;

			dev->stats.tx_packets++;
		}

		j = TX_NEXT(j);
	}
	lp->tx_old = j;

	if (netif_queue_stopped(dev) &&
	    TX_BUFFS_AVAIL > 0)
		netif_wake_queue(dev);
out:
	spin_unlock(&lp->lock);
}

static irqreturn_t lance_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct lance_private *lp = netdev_priv(dev);
	int csr0;

	sbus_writew(LE_CSR0, lp->lregs + RAP);
	csr0 = sbus_readw(lp->lregs + RDP);

	/* Acknowledge all the interrupt sources ASAP */
	sbus_writew(csr0 & (LE_C0_INTR | LE_C0_TINT | LE_C0_RINT),
		    lp->lregs + RDP);

	if ((csr0 & LE_C0_ERR) != 0) {
		/* Clear the error condition */
		sbus_writew((LE_C0_BABL | LE_C0_ERR | LE_C0_MISS |
			     LE_C0_CERR | LE_C0_MERR),
			    lp->lregs + RDP);
	}

	if (csr0 & LE_C0_RINT)
		lp->rx(dev);

	if (csr0 & LE_C0_TINT)
		lp->tx(dev);

	if (csr0 & LE_C0_BABL)
		dev->stats.tx_errors++;

	if (csr0 & LE_C0_MISS)
		dev->stats.rx_errors++;

	if (csr0 & LE_C0_MERR) {
		if (lp->dregs) {
			u32 addr = sbus_readl(lp->dregs + DMA_ADDR);

			printk(KERN_ERR "%s: Memory error, status %04x, addr %06x\n",
			       dev->name, csr0, addr & 0xffffff);
		} else {
			printk(KERN_ERR "%s: Memory error, status %04x\n",
			       dev->name, csr0);
		}

		sbus_writew(LE_C0_STOP, lp->lregs + RDP);

		if (lp->dregs) {
			u32 dma_csr = sbus_readl(lp->dregs + DMA_CSR);

			dma_csr |= DMA_FIFO_INV;
			sbus_writel(dma_csr, lp->dregs + DMA_CSR);
		}

		lp->init_ring(dev);
		load_csrs(lp);
		init_restart_lance(lp);
		netif_wake_queue(dev);
	}

	sbus_writew(LE_C0_INEA, lp->lregs + RDP);

	return IRQ_HANDLED;
}

/* Build a fake network packet and send it to ourselves. */
static void build_fake_packet(struct lance_private *lp)
{
	struct net_device *dev = lp->dev;
	int i, entry;

	entry = lp->tx_new & TX_RING_MOD_MASK;
	if (lp->pio_buffer) {
		struct lance_init_block __iomem *ib = lp->init_block_iomem;
		u16 __iomem *packet = (u16 __iomem *) &(ib->tx_buf[entry][0]);
		struct ethhdr __iomem *eth = (struct ethhdr __iomem *) packet;
		for (i = 0; i < (ETH_ZLEN / sizeof(u16)); i++)
			sbus_writew(0, &packet[i]);
		for (i = 0; i < 6; i++) {
			sbus_writeb(dev->dev_addr[i], &eth->h_dest[i]);
			sbus_writeb(dev->dev_addr[i], &eth->h_source[i]);
		}
		sbus_writew((-ETH_ZLEN) | 0xf000, &ib->btx_ring[entry].length);
		sbus_writew(0, &ib->btx_ring[entry].misc);
		sbus_writeb(LE_T1_POK|LE_T1_OWN, &ib->btx_ring[entry].tmd1_bits);
	} else {
		struct lance_init_block *ib = lp->init_block_mem;
		u16 *packet = (u16 *) &(ib->tx_buf[entry][0]);
		struct ethhdr *eth = (struct ethhdr *) packet;
		memset(packet, 0, ETH_ZLEN);
		for (i = 0; i < 6; i++) {
			eth->h_dest[i] = dev->dev_addr[i];
			eth->h_source[i] = dev->dev_addr[i];
		}
		ib->btx_ring[entry].length = (-ETH_ZLEN) | 0xf000;
		ib->btx_ring[entry].misc = 0;
		ib->btx_ring[entry].tmd1_bits = (LE_T1_POK|LE_T1_OWN);
	}
	lp->tx_new = TX_NEXT(entry);
}

static int lance_open(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	int status = 0;

	STOP_LANCE(lp);

	if (request_irq(dev->irq, lance_interrupt, IRQF_SHARED,
			lancestr, (void *) dev)) {
		printk(KERN_ERR "Lance: Can't get irq %d\n", dev->irq);
		return -EAGAIN;
	}

	/* On the 4m, setup the ledma to provide the upper bits for buffers */
	if (lp->dregs) {
		u32 regval = lp->init_block_dvma & 0xff000000;

		sbus_writel(regval, lp->dregs + DMA_TEST);
	}

	/* Set mode and clear multicast filter only at device open,
	 * so that lance_init_ring() called at any error will not
	 * forget multicast filters.
	 *
	 * BTW it is common bug in all lance drivers! --ANK
	 */
	if (lp->pio_buffer) {
		struct lance_init_block __iomem *ib = lp->init_block_iomem;
		sbus_writew(0, &ib->mode);
		sbus_writel(0, &ib->filter[0]);
		sbus_writel(0, &ib->filter[1]);
	} else {
		struct lance_init_block *ib = lp->init_block_mem;
		ib->mode = 0;
		ib->filter [0] = 0;
		ib->filter [1] = 0;
	}

	lp->init_ring(dev);
	load_csrs(lp);

	netif_start_queue(dev);

	status = init_restart_lance(lp);
	if (!status && lp->auto_select) {
		build_fake_packet(lp);
		sbus_writew(LE_C0_INEA | LE_C0_TDMD, lp->lregs + RDP);
	}

	return status;
}

static int lance_close(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);

	netif_stop_queue(dev);
	del_timer_sync(&lp->multicast_timer);

	STOP_LANCE(lp);

	free_irq(dev->irq, (void *) dev);
	return 0;
}

static int lance_reset(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	int status;

	STOP_LANCE(lp);

	/* On the 4m, reset the dma too */
	if (lp->dregs) {
		u32 csr, addr;

		printk(KERN_ERR "resetting ledma\n");
		csr = sbus_readl(lp->dregs + DMA_CSR);
		sbus_writel(csr | DMA_RST_ENET, lp->dregs + DMA_CSR);
		udelay(200);
		sbus_writel(csr & ~DMA_RST_ENET, lp->dregs + DMA_CSR);

		addr = lp->init_block_dvma & 0xff000000;
		sbus_writel(addr, lp->dregs + DMA_TEST);
	}
	lp->init_ring(dev);
	load_csrs(lp);
	netif_trans_update(dev); /* prevent tx timeout */
	status = init_restart_lance(lp);
	return status;
}

static void lance_piocopy_from_skb(void __iomem *dest, unsigned char *src, int len)
{
	void __iomem *piobuf = dest;
	u32 *p32;
	u16 *p16;
	u8 *p8;

	switch ((unsigned long)src & 0x3) {
	case 0:
		p32 = (u32 *) src;
		while (len >= 4) {
			sbus_writel(*p32, piobuf);
			p32++;
			piobuf += 4;
			len -= 4;
		}
		src = (char *) p32;
		break;
	case 1:
	case 3:
		p8 = (u8 *) src;
		while (len >= 4) {
			u32 val;

			val  = p8[0] << 24;
			val |= p8[1] << 16;
			val |= p8[2] << 8;
			val |= p8[3];
			sbus_writel(val, piobuf);
			p8 += 4;
			piobuf += 4;
			len -= 4;
		}
		src = (char *) p8;
		break;
	case 2:
		p16 = (u16 *) src;
		while (len >= 4) {
			u32 val = p16[0]<<16 | p16[1];
			sbus_writel(val, piobuf);
			p16 += 2;
			piobuf += 4;
			len -= 4;
		}
		src = (char *) p16;
		break;
	}
	if (len >= 2) {
		u16 val = src[0] << 8 | src[1];
		sbus_writew(val, piobuf);
		src += 2;
		piobuf += 2;
		len -= 2;
	}
	if (len >= 1)
		sbus_writeb(src[0], piobuf);
}

static void lance_piozero(void __iomem *dest, int len)
{
	void __iomem *piobuf = dest;

	if ((unsigned long)piobuf & 1) {
		sbus_writeb(0, piobuf);
		piobuf += 1;
		len -= 1;
		if (len == 0)
			return;
	}
	if (len == 1) {
		sbus_writeb(0, piobuf);
		return;
	}
	if ((unsigned long)piobuf & 2) {
		sbus_writew(0, piobuf);
		piobuf += 2;
		len -= 2;
		if (len == 0)
			return;
	}
	while (len >= 4) {
		sbus_writel(0, piobuf);
		piobuf += 4;
		len -= 4;
	}
	if (len >= 2) {
		sbus_writew(0, piobuf);
		piobuf += 2;
		len -= 2;
	}
	if (len >= 1)
		sbus_writeb(0, piobuf);
}

static void lance_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
	struct lance_private *lp = netdev_priv(dev);

	printk(KERN_ERR "%s: transmit timed out, status %04x, reset\n",
	       dev->name, sbus_readw(lp->lregs + RDP));
	lance_reset(dev);
	netif_wake_queue(dev);
}

static netdev_tx_t lance_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	int entry, skblen, len;

	skblen = skb->len;

	len = (skblen <= ETH_ZLEN) ? ETH_ZLEN : skblen;

	spin_lock_irq(&lp->lock);

	dev->stats.tx_bytes += len;

	entry = lp->tx_new & TX_RING_MOD_MASK;
	if (lp->pio_buffer) {
		struct lance_init_block __iomem *ib = lp->init_block_iomem;
		sbus_writew((-len) | 0xf000, &ib->btx_ring[entry].length);
		sbus_writew(0, &ib->btx_ring[entry].misc);
		lance_piocopy_from_skb(&ib->tx_buf[entry][0], skb->data, skblen);
		if (len != skblen)
			lance_piozero(&ib->tx_buf[entry][skblen], len - skblen);
		sbus_writeb(LE_T1_POK | LE_T1_OWN, &ib->btx_ring[entry].tmd1_bits);
	} else {
		struct lance_init_block *ib = lp->init_block_mem;
		ib->btx_ring [entry].length = (-len) | 0xf000;
		ib->btx_ring [entry].misc = 0;
		skb_copy_from_linear_data(skb, &ib->tx_buf [entry][0], skblen);
		if (len != skblen)
			memset((char *) &ib->tx_buf [entry][skblen], 0, len - skblen);
		ib->btx_ring [entry].tmd1_bits = (LE_T1_POK | LE_T1_OWN);
	}

	lp->tx_new = TX_NEXT(entry);

	if (TX_BUFFS_AVAIL <= 0)
		netif_stop_queue(dev);

	/* Kick the lance: transmit now */
	sbus_writew(LE_C0_INEA | LE_C0_TDMD, lp->lregs + RDP);

	/* Read back CSR to invalidate the E-Cache.
	 * This is needed, because DMA_DSBL_WR_INV is set.
	 */
	if (lp->dregs)
		sbus_readw(lp->lregs + RDP);

	spin_unlock_irq(&lp->lock);

	dev_kfree_skb(skb);

	return NETDEV_TX_OK;
}

/* taken from the depca driver */
static void lance_load_multicast(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct netdev_hw_addr *ha;
	u32 crc;
	u32 val;

	/* set all multicast bits */
	if (dev->flags & IFF_ALLMULTI)
		val = ~0;
	else
		val = 0;

	if (lp->pio_buffer) {
		struct lance_init_block __iomem *ib = lp->init_block_iomem;
		sbus_writel(val, &ib->filter[0]);
		sbus_writel(val, &ib->filter[1]);
	} else {
		struct lance_init_block *ib = lp->init_block_mem;
		ib->filter [0] = val;
		ib->filter [1] = val;
	}

	if (dev->flags & IFF_ALLMULTI)
		return;

	/* Add addresses */
	netdev_for_each_mc_addr(ha, dev) {
		crc = ether_crc_le(6, ha->addr);
		crc = crc >> 26;
		if (lp->pio_buffer) {
			struct lance_init_block __iomem *ib = lp->init_block_iomem;
			u16 __iomem *mcast_table = (u16 __iomem *) &ib->filter;
			u16 tmp = sbus_readw(&mcast_table[crc>>4]);
			tmp |= 1 << (crc & 0xf);
			sbus_writew(tmp, &mcast_table[crc>>4]);
		} else {
			struct lance_init_block *ib = lp->init_block_mem;
			u16 *mcast_table = (u16 *) &ib->filter;
			mcast_table [crc >> 4] |= 1 << (crc & 0xf);
		}
	}
}

static void lance_set_multicast(struct net_device *dev)
{
	struct lance_private *lp = netdev_priv(dev);
	struct lance_init_block *ib_mem = lp->init_block_mem;
	struct lance_init_block __iomem *ib_iomem = lp->init_block_iomem;
	u16 mode;

	if (!netif_running(dev))
		return;

	if (lp->tx_old != lp->tx_new) {
		mod_timer(&lp->multicast_timer, jiffies + 4);
		netif_wake_queue(dev);
		return;
	}

	netif_stop_queue(dev);

	STOP_LANCE(lp);
	lp->init_ring(dev);

	if (lp->pio_buffer)
		mode = sbus_readw(&ib_iomem->mode);
	else
		mode = ib_mem->mode;
	if (dev->flags & IFF_PROMISC) {
		mode |= LE_MO_PROM;
		if (lp->pio_buffer)
			sbus_writew(mode, &ib_iomem->mode);
		else
			ib_mem->mode = mode;
	} else {
		mode &= ~LE_MO_PROM;
		if (lp->pio_buffer)
			sbus_writew(mode, &ib_iomem->mode);
		else
			ib_mem->mode = mode;
		lance_load_multicast(dev);
	}
	load_csrs(lp);
	init_restart_lance(lp);
	netif_wake_queue(dev);
}

static void lance_set_multicast_retry(struct timer_list *t)
{
	struct lance_private *lp = from_timer(lp, t, multicast_timer);
	struct net_device *dev = lp->dev;

	lance_set_multicast(dev);
}

static void lance_free_hwresources(struct lance_private *lp)
{
	if (lp->lregs)
		of_iounmap(&lp->op->resource[0], lp->lregs, LANCE_REG_SIZE);
	if (lp->dregs) {
		struct platform_device *ledma = lp->ledma;

		of_iounmap(&ledma->resource[0], lp->dregs,
			   resource_size(&ledma->resource[0]));
	}
	if (lp->init_block_iomem) {
		of_iounmap(&lp->lebuffer->resource[0], lp->init_block_iomem,
			   sizeof(struct lance_init_block));
	} else if (lp->init_block_mem) {
		dma_free_coherent(&lp->op->dev,
				  sizeof(struct lance_init_block),
				  lp->init_block_mem,
				  lp->init_block_dvma);
	}
}

/* Ethtool support... */
static void sparc_lance_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, "sunlance", sizeof(info->driver));
}

static const struct ethtool_ops sparc_lance_ethtool_ops = {
	.get_drvinfo		= sparc_lance_get_drvinfo,
	.get_link		= ethtool_op_get_link,
};

static const struct net_device_ops sparc_lance_ops = {
	.ndo_open		= lance_open,
	.ndo_stop		= lance_close,
	.ndo_start_xmit		= lance_start_xmit,
	.ndo_set_rx_mode	= lance_set_multicast,
	.ndo_tx_timeout		= lance_tx_timeout,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};

static int sparc_lance_probe_one(struct platform_device *op,
				 struct platform_device *ledma,
				 struct platform_device *lebuffer)
{
	struct device_node *dp = op->dev.of_node;
	struct lance_private *lp;
	struct net_device *dev;
	int    i;

	dev = alloc_etherdev(sizeof(struct lance_private) + 8);
	if (!dev)
		return -ENOMEM;

	lp = netdev_priv(dev);

	spin_lock_init(&lp->lock);

	/* Copy the IDPROM ethernet address to the device structure, later we
	 * will copy the address in the device structure to the lance
	 * initialization block.
	 */
	for (i = 0; i < 6; i++)
		dev->dev_addr[i] = idprom->id_ethaddr[i];

	/* Get the IO region */
	lp->lregs = of_ioremap(&op->resource[0], 0,
			       LANCE_REG_SIZE, lancestr);
	if (!lp->lregs) {
		printk(KERN_ERR "SunLance: Cannot map registers.\n");
		goto fail;
	}

	lp->ledma = ledma;
	if (lp->ledma) {
		lp->dregs = of_ioremap(&ledma->resource[0], 0,
				       resource_size(&ledma->resource[0]),
				       "ledma");
		if (!lp->dregs) {
			printk(KERN_ERR "SunLance: Cannot map "
			       "ledma registers.\n");
			goto fail;
		}
	}

	lp->op = op;
	lp->lebuffer = lebuffer;
	if (lebuffer) {
		/* sanity check */
		if (lebuffer->resource[0].start & 7) {
			printk(KERN_ERR "SunLance: ERROR: Rx and Tx rings not on even boundary.\n");
			goto fail;
		}
		lp->init_block_iomem =
			of_ioremap(&lebuffer->resource[0], 0,
				   sizeof(struct lance_init_block), "lebuffer");
		if (!lp->init_block_iomem) {
			printk(KERN_ERR "SunLance: Cannot map PIO buffer.\n");
			goto fail;
		}
		lp->init_block_dvma = 0;
		lp->pio_buffer = 1;
		lp->init_ring = lance_init_ring_pio;
		lp->rx = lance_rx_pio;
		lp->tx = lance_tx_pio;
	} else {
		lp->init_block_mem =
			dma_alloc_coherent(&op->dev,
					   sizeof(struct lance_init_block),
					   &lp->init_block_dvma, GFP_ATOMIC);
		if (!lp->init_block_mem)
			goto fail;

		lp->pio_buffer = 0;
		lp->init_ring = lance_init_ring_dvma;
		lp->rx = lance_rx_dvma;
		lp->tx = lance_tx_dvma;
	}
	lp->busmaster_regval = of_getintprop_default(dp,  "busmaster-regval",
						     (LE_C3_BSWP |
						      LE_C3_ACON |
						      LE_C3_BCON));

	lp->name = lancestr;

	lp->burst_sizes = 0;
	if (lp->ledma) {
		struct device_node *ledma_dp = ledma->dev.of_node;
		struct device_node *sbus_dp;
		unsigned int sbmask;
		const char *prop;
		u32 csr;

		/* Find burst-size property for ledma */
		lp->burst_sizes = of_getintprop_default(ledma_dp,
							"burst-sizes", 0);

		/* ledma may be capable of fast bursts, but sbus may not. */
		sbus_dp = ledma_dp->parent;
		sbmask = of_getintprop_default(sbus_dp, "burst-sizes",
					       DMA_BURSTBITS);
		lp->burst_sizes &= sbmask;

		/* Get the cable-selection property */
		prop = of_get_property(ledma_dp, "cable-selection", NULL);
		if (!prop || prop[0] == '\0') {
			struct device_node *nd;

			printk(KERN_INFO "SunLance: using "
			       "auto-carrier-detection.\n");

			nd = of_find_node_by_path("/options");
			if (!nd)
				goto no_link_test;

			prop = of_get_property(nd, "tpe-link-test?", NULL);
			if (!prop)
				goto node_put;

			if (strcmp(prop, "true")) {
				printk(KERN_NOTICE "SunLance: warning: overriding option "
				       "'tpe-link-test?'\n");
				printk(KERN_NOTICE "SunLance: warning: mail any problems "
				       "to ecd@skynet.be\n");
				auxio_set_lte(AUXIO_LTE_ON);
			}
node_put:
			of_node_put(nd);
no_link_test:
			lp->auto_select = 1;
			lp->tpe = 0;
		} else if (!strcmp(prop, "aui")) {
			lp->auto_select = 0;
			lp->tpe = 0;
		} else {
			lp->auto_select = 0;
			lp->tpe = 1;
		}

		/* Reset ledma */
		csr = sbus_readl(lp->dregs + DMA_CSR);
		sbus_writel(csr | DMA_RST_ENET, lp->dregs + DMA_CSR);
		udelay(200);
		sbus_writel(csr & ~DMA_RST_ENET, lp->dregs + DMA_CSR);
	} else
		lp->dregs = NULL;

	lp->dev = dev;
	SET_NETDEV_DEV(dev, &op->dev);
	dev->watchdog_timeo = 5*HZ;
	dev->ethtool_ops = &sparc_lance_ethtool_ops;
	dev->netdev_ops = &sparc_lance_ops;

	dev->irq = op->archdata.irqs[0];

	/* We cannot sleep if the chip is busy during a
	 * multicast list update event, because such events
	 * can occur from interrupts (ex. IPv6).  So we
	 * use a timer to try again later when necessary. -DaveM
	 */
	timer_setup(&lp->multicast_timer, lance_set_multicast_retry, 0);

	if (register_netdev(dev)) {
		printk(KERN_ERR "SunLance: Cannot register device.\n");
		goto fail;
	}

	platform_set_drvdata(op, lp);

	printk(KERN_INFO "%s: LANCE %pM\n",
	       dev->name, dev->dev_addr);

	return 0;

fail:
	lance_free_hwresources(lp);
	free_netdev(dev);
	return -ENODEV;
}

static int sunlance_sbus_probe(struct platform_device *op)
{
	struct platform_device *parent = to_platform_device(op->dev.parent);
	struct device_node *parent_dp = parent->dev.of_node;
	int err;

	if (of_node_name_eq(parent_dp, "ledma")) {
		err = sparc_lance_probe_one(op, parent, NULL);
	} else if (of_node_name_eq(parent_dp, "lebuffer")) {
		err = sparc_lance_probe_one(op, NULL, parent);
	} else
		err = sparc_lance_probe_one(op, NULL, NULL);

	return err;
}

static int sunlance_sbus_remove(struct platform_device *op)
{
	struct lance_private *lp = platform_get_drvdata(op);
	struct net_device *net_dev = lp->dev;

	unregister_netdev(net_dev);

	lance_free_hwresources(lp);

	free_netdev(net_dev);

	return 0;
}

static const struct of_device_id sunlance_sbus_match[] = {
	{
		.name = "le",
	},
	{},
};

MODULE_DEVICE_TABLE(of, sunlance_sbus_match);

static struct platform_driver sunlance_sbus_driver = {
	.driver = {
		.name = "sunlance",
		.of_match_table = sunlance_sbus_match,
	},
	.probe		= sunlance_sbus_probe,
	.remove		= sunlance_sbus_remove,
};

module_platform_driver(sunlance_sbus_driver);