summaryrefslogtreecommitdiffstats
path: root/drivers/net/lasi_82596.c
blob: 452863d5d498a5aa9f9d08c0e9f4b817d13a3584 (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
/* lasi_82596.c -- driver for the intel 82596 ethernet controller, as
   munged into HPPA boxen .

   This driver is based upon 82596.c, original credits are below...
   but there were too many hoops which HP wants jumped through to
   keep this code in there in a sane manner.

   3 primary sources of the mess --
   1) hppa needs *lots* of cacheline flushing to keep this kind of
   MMIO running.

   2) The 82596 needs to see all of its pointers as their physical
   address.  Thus virt_to_bus/bus_to_virt are *everywhere*.

   3) The implementation HP is using seems to be significantly pickier
   about when and how the command and RX units are started.  some
   command ordering was changed.

   Examination of the mach driver leads one to believe that there
   might be a saner way to pull this off...  anyone who feels like a
   full rewrite can be my guest.

   Split 02/13/2000 Sam Creasey (sammy@oh.verio.com)

   02/01/2000  Initial modifications for parisc by Helge Deller (deller@gmx.de)
   03/02/2000  changes for better/correct(?) cache-flushing (deller)
*/

/* 82596.c: A generic 82596 ethernet driver for linux. */
/*
   Based on Apricot.c
   Written 1994 by Mark Evans.
   This driver is for the Apricot 82596 bus-master interface

   Modularised 12/94 Mark Evans


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

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

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

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

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

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

 */

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

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/pdc.h>
#include <asm/cache.h>
#include <asm/parisc-device.h>

#define LASI_82596_DRIVER_VERSION "LASI 82596 driver - Revision: 1.30"

/* DEBUG flags
 */

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


#define DEB(x,y)	if (i596_debug & (x)) { y; }


#define  CHECK_WBACK(priv, addr,len) \
	do { dma_cache_sync((priv)->dev, (void *)addr, len, DMA_TO_DEVICE); } while (0)

#define  CHECK_INV(priv, addr,len) \
	do { dma_cache_sync((priv)->dev, (void *)addr, len, DMA_FROM_DEVICE); } while(0)

#define  CHECK_WBACK_INV(priv, addr,len) \
	do { dma_cache_sync((priv)->dev, (void *)addr, len, DMA_BIDIRECTIONAL); } while (0)


#define PA_I82596_RESET		0	/* Offsets relative to LASI-LAN-Addr.*/
#define PA_CPU_PORT_L_ACCESS	4
#define PA_CHANNEL_ATTENTION	8


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

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

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

static int i596_debug = (DEB_SERIOUS|DEB_PROBE);

MODULE_AUTHOR("Richard Hirst");
MODULE_DESCRIPTION("i82596 driver");
MODULE_LICENSE("GPL");
module_param(i596_debug, int, 0);
MODULE_PARM_DESC(i596_debug, "lasi_82596 debug mask");

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

#define MAX_DRIVERS	4	/* max count of drivers */

#define PKT_BUF_SZ	1536
#define MAX_MC_CNT	64

#define I596_NULL ((u32)0xffffffff)

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

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

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

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

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

#define TX_TIMEOUT	5

#define OPT_SWAP_PORT	0x0001	/* Need to wordswp on the MPU port */


struct i596_reg {
	unsigned short porthi;
	unsigned short portlo;
	u32            ca;
};

#define EOF		0x8000
#define SIZE_MASK	0x3fff

struct i596_tbd {
	unsigned short size;
	unsigned short pad;
	dma_addr_t     next;
	dma_addr_t     data;
	u32 cache_pad[5];		/* Total 32 bytes... */
};

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

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

struct tx_cmd {
	struct i596_cmd cmd;
	dma_addr_t     tbd;
	unsigned short size;
	unsigned short pad;
	struct sk_buff *skb;		/* So we can free it after tx */
	dma_addr_t dma_addr;
#ifdef __LP64__
	u32 cache_pad[6];		/* Total 64 bytes... */
#else
	u32 cache_pad[1];		/* Total 32 bytes... */
#endif
};

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

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

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

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

struct i596_rfd {
	unsigned short stat;
	unsigned short cmd;
	dma_addr_t     b_next;	/* Address from i596 viewpoint */
	dma_addr_t     rbd;
	unsigned short count;
	unsigned short size;
	struct i596_rfd *v_next;	/* Address from CPUs viewpoint */
	struct i596_rfd *v_prev;
#ifndef __LP64__
	u32 cache_pad[2];		/* Total 32 bytes... */
#endif
};

struct i596_rbd {
    /* hardware data */
    unsigned short count;
    unsigned short zero1;
    dma_addr_t     b_next;
    dma_addr_t     b_data;		/* Address from i596 viewpoint */
    unsigned short size;
    unsigned short zero2;
    /* driver data */
    struct sk_buff *skb;
    struct i596_rbd *v_next;
    dma_addr_t     b_addr;		/* This rbd addr from i596 view */
    unsigned char *v_data;		/* Address from CPUs viewpoint */
					/* Total 32 bytes... */
#ifdef __LP64__
    u32 cache_pad[4];
#endif
};

/* These values as chosen so struct i596_private fits in one page... */

#define TX_RING_SIZE 32
#define RX_RING_SIZE 16

struct i596_scb {
	unsigned short status;
	unsigned short command;
	dma_addr_t    cmd;
	dma_addr_t    rfd;
	u32           crc_err;
	u32           align_err;
	u32           resource_err;
	u32           over_err;
	u32           rcvdt_err;
	u32           short_err;
	unsigned short t_on;
	unsigned short t_off;
};

struct i596_iscp {
	u32           stat;
	dma_addr_t    scb;
};

struct i596_scp {
	u32           sysbus;
	u32            pad;
	dma_addr_t    iscp;
};

struct i596_private {
	volatile struct i596_scp scp		__attribute__((aligned(32)));
	volatile struct i596_iscp iscp		__attribute__((aligned(32)));
	volatile struct i596_scb scb		__attribute__((aligned(32)));
	struct sa_cmd sa_cmd			__attribute__((aligned(32)));
	struct cf_cmd cf_cmd			__attribute__((aligned(32)));
	struct tdr_cmd tdr_cmd			__attribute__((aligned(32)));
	struct mc_cmd mc_cmd			__attribute__((aligned(32)));
	struct i596_rfd rfds[RX_RING_SIZE]	__attribute__((aligned(32)));
	struct i596_rbd rbds[RX_RING_SIZE]	__attribute__((aligned(32)));
	struct tx_cmd tx_cmds[TX_RING_SIZE]	__attribute__((aligned(32)));
	struct i596_tbd tbds[TX_RING_SIZE]	__attribute__((aligned(32)));
	u32    stat;
	int last_restart;
	struct i596_rfd *rfd_head;
	struct i596_rbd *rbd_head;
	struct i596_cmd *cmd_tail;
	struct i596_cmd *cmd_head;
	int cmd_backlog;
	u32    last_cmd;
	struct net_device_stats stats;
	int next_tx_cmd;
	int options;
	spinlock_t lock;
	dma_addr_t dma_addr;
	struct device *dev;
};

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

static int i596_open(struct net_device *dev);
static int i596_start_xmit(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t i596_interrupt(int irq, void *dev_id);
static int i596_close(struct net_device *dev);
static struct net_device_stats *i596_get_stats(struct net_device *dev);
static void i596_add_cmd(struct net_device *dev, struct i596_cmd *cmd);
static void i596_tx_timeout (struct net_device *dev);
static void print_eth(unsigned char *buf, char *str);
static void set_multicast_list(struct net_device *dev);

static int rx_ring_size = RX_RING_SIZE;
static int ticks_limit = 100;
static int max_cmd_backlog = TX_RING_SIZE-1;

#ifdef CONFIG_NET_POLL_CONTROLLER
static void i596_poll_controller(struct net_device *dev);
#endif


static inline void CA(struct net_device *dev)
{
	gsc_writel(0, dev->base_addr + PA_CHANNEL_ATTENTION);
}


static inline void MPU_PORT(struct net_device *dev, int c, dma_addr_t x)
{
	struct i596_private *lp = dev->priv;

	u32 v = (u32) (c) | (u32) (x);
	u16 a, b;

	if (lp->options & OPT_SWAP_PORT) {
		a = v >> 16;
		b = v & 0xffff;
	} else {
		a = v & 0xffff;
		b = v >> 16;
	}

	gsc_writel(a, dev->base_addr + PA_CPU_PORT_L_ACCESS);
	udelay(1);
	gsc_writel(b, dev->base_addr + PA_CPU_PORT_L_ACCESS);
}


static inline int wait_istat(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
	CHECK_INV(lp, &(lp->iscp), sizeof(struct i596_iscp));
	while (--delcnt && lp->iscp.stat) {
		udelay(10);
		CHECK_INV(lp, &(lp->iscp), sizeof(struct i596_iscp));
	}
	if (!delcnt) {
		printk("%s: %s, iscp.stat %04x, didn't clear\n",
		     dev->name, str, lp->iscp.stat);
		return -1;
	}
	else
		return 0;
}


static inline int wait_cmd(struct net_device *dev, struct i596_private *lp, int delcnt, char *str)
{
	CHECK_INV(lp, &(lp->scb), sizeof(struct i596_scb));
	while (--delcnt && lp->scb.command) {
		udelay(10);
		CHECK_INV(lp, &(lp->scb), sizeof(struct i596_scb));
	}
	if (!delcnt) {
		printk("%s: %s, status %4.4x, cmd %4.4x.\n",
		     dev->name, str, lp->scb.status, lp->scb.command);
		return -1;
	}
	else
		return 0;
}


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

	printk("lp and scp at %p, .sysbus = %08x, .iscp = %08x\n",
	       &lp->scp, lp->scp.sysbus, lp->scp.iscp);
	printk("iscp at %p, iscp.stat = %08x, .scb = %08x\n",
	       &lp->iscp, lp->iscp.stat, lp->iscp.scb);
	printk("scb at %p, scb.status = %04x, .command = %04x,"
		" .cmd = %08x, .rfd = %08x\n",
	       &lp->scb, lp->scb.status, lp->scb.command,
		lp->scb.cmd, lp->scb.rfd);
	printk("   errors: crc %x, align %x, resource %x,"
               " over %x, rcvdt %x, short %x\n",
		lp->scb.crc_err, lp->scb.align_err, lp->scb.resource_err,
		lp->scb.over_err, lp->scb.rcvdt_err, lp->scb.short_err);
	cmd = lp->cmd_head;
	while (cmd != NULL) {
		printk("cmd at %p, .status = %04x, .command = %04x, .b_next = %08x\n",
		  cmd, cmd->status, cmd->command, cmd->b_next);
		cmd = cmd->v_next;
	}
	rfd = lp->rfd_head;
	printk("rfd_head = %p\n", rfd);
	do {
		printk("   %p .stat %04x, .cmd %04x, b_next %08x, rbd %08x,"
                        " count %04x\n",
			rfd, rfd->stat, rfd->cmd, rfd->b_next, rfd->rbd,
			rfd->count);
		rfd = rfd->v_next;
	} while (rfd != lp->rfd_head);
	rbd = lp->rbd_head;
	printk("rbd_head = %p\n", rbd);
	do {
		printk("   %p .count %04x, b_next %08x, b_data %08x, size %04x\n",
			rbd, rbd->count, rbd->b_next, rbd->b_data, rbd->size);
		rbd = rbd->v_next;
	} while (rbd != lp->rbd_head);
	CHECK_INV(lp, lp, sizeof(struct i596_private));
}


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

	pcc2[0x28] = 1;
	pcc2[0x2b] = 0x1d;
	printk("%s: Error interrupt\n", dev->name);
	i596_display_data(dev);
}
#endif

#define virt_to_dma(lp,v) ((lp)->dma_addr + (dma_addr_t)((unsigned long)(v)-(unsigned long)(lp)))

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

	/* First build the Receive Buffer Descriptor List */

	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
		dma_addr_t dma_addr;
		struct sk_buff *skb = dev_alloc_skb(PKT_BUF_SZ + 4);

		if (skb == NULL)
			panic("%s: alloc_skb() failed", __FILE__);
		skb_reserve(skb, 2);
		dma_addr = dma_map_single(lp->dev, skb->data,PKT_BUF_SZ,
					  DMA_FROM_DEVICE);
		skb->dev = dev;
		rbd->v_next = rbd+1;
		rbd->b_next = WSWAPrbd(virt_to_dma(lp,rbd+1));
		rbd->b_addr = WSWAPrbd(virt_to_dma(lp,rbd));
		rbd->skb = skb;
		rbd->v_data = skb->data;
		rbd->b_data = WSWAPchar(dma_addr);
		rbd->size = PKT_BUF_SZ;
	}
	lp->rbd_head = lp->rbds;
	rbd = lp->rbds + rx_ring_size - 1;
	rbd->v_next = lp->rbds;
	rbd->b_next = WSWAPrbd(virt_to_dma(lp,lp->rbds));

	/* Now build the Receive Frame Descriptor List */

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

	CHECK_WBACK_INV(lp, lp, sizeof(struct i596_private));
}

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

	for (i = 0, rbd = lp->rbds; i < rx_ring_size; i++, rbd++) {
		if (rbd->skb == NULL)
			break;
		dma_unmap_single(lp->dev,
				 (dma_addr_t)WSWAPchar(rbd->b_data),
				 PKT_BUF_SZ, DMA_FROM_DEVICE);
		dev_kfree_skb(rbd->skb);
	}
}


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

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

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

	CHECK_WBACK_INV(lp, lp, sizeof(struct i596_private));
}


static int init_i596_mem(struct net_device *dev)
{
	struct i596_private *lp = dev->priv;
	unsigned long flags;

	disable_irq(dev->irq);	/* disable IRQs from LAN */
	DEB(DEB_INIT,
		printk("RESET 82596 port: %lx (with IRQ %d disabled)\n",
		       (dev->base_addr + PA_I82596_RESET),
		       dev->irq));

	gsc_writel(0, (dev->base_addr + PA_I82596_RESET)); /* Hard Reset */
	udelay(100);			/* Wait 100us - seems to help */

	/* change the scp address */

	lp->last_cmd = jiffies;


	lp->scp.sysbus = 0x0000006c;
	lp->scp.iscp = WSWAPiscp(virt_to_dma(lp,&(lp->iscp)));
	lp->iscp.scb = WSWAPscb(virt_to_dma(lp,&(lp->scb)));
	lp->iscp.stat = ISCP_BUSY;
	lp->cmd_backlog = 0;

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

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

	CHECK_WBACK(lp, &(lp->scp), sizeof(struct i596_scp));
	CHECK_WBACK(lp, &(lp->iscp), sizeof(struct i596_iscp));

	MPU_PORT(dev, PORT_ALTSCP, virt_to_dma(lp,&lp->scp));

	CA(dev);

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

	/* Ensure rx frame/buffer descriptors are tidy */
	rebuild_rx_bufs(dev);

	lp->scb.command = 0;
	CHECK_WBACK(lp, &(lp->scb), sizeof(struct i596_scb));

	enable_irq(dev->irq);	/* enable IRQs from LAN */

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

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

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

	spin_lock_irqsave (&lp->lock, flags);

	if (wait_cmd(dev, lp, 1000, "timed out waiting to issue RX_START")) {
		spin_unlock_irqrestore (&lp->lock, flags);
		goto failed;
	}
	DEB(DEB_INIT, printk("%s: Issuing RX_START\n", dev->name));
	lp->scb.command = RX_START;
	lp->scb.rfd = WSWAPrfd(virt_to_dma(lp,lp->rfds));
	CHECK_WBACK(lp, &(lp->scb), sizeof(struct i596_scb));

	CA(dev);

	spin_unlock_irqrestore (&lp->lock, flags);

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

	return 0;

failed:
	printk("%s: Failed to initialise 82596\n", dev->name);
	MPU_PORT(dev, PORT_RESET, 0);
	return -1;
}


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

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


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

	CHECK_INV(lp, rfd, sizeof(struct i596_rfd));
	while ((rfd->stat) & STAT_C) {	/* Loop while complete frames */
		if (rfd->rbd == I596_NULL)
			rbd = NULL;
		else if (rfd->rbd == lp->rbd_head->b_addr) {
			rbd = lp->rbd_head;
			CHECK_INV(lp, rbd, sizeof(struct i596_rbd));
		}
		else {
			printk("%s: rbd chain broken!\n", dev->name);
			/* XXX Now what? */
			rbd = NULL;
		}
		DEB(DEB_RXFRAME, printk("  rfd %p, rfd.rbd %08x, rfd.stat %04x\n",
			rfd, rfd->rbd, rfd->stat));

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

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

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

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

				dma_unmap_single(lp->dev,(dma_addr_t)WSWAPchar(rbd->b_data), PKT_BUF_SZ, DMA_FROM_DEVICE);
				/* Get fresh skbuff to replace filled one. */
				newskb = dev_alloc_skb(PKT_BUF_SZ + 4);
				if (newskb == NULL) {
					skb = NULL;	/* drop pkt */
					goto memory_squeeze;
				}
				skb_reserve(newskb, 2);

				/* Pass up the skb already on the Rx ring. */
				skb_put(skb, pkt_len);
				rx_in_place = 1;
				rbd->skb = newskb;
				newskb->dev = dev;
				dma_addr = dma_map_single(lp->dev, newskb->data, PKT_BUF_SZ, DMA_FROM_DEVICE);
				rbd->v_data = newskb->data;
				rbd->b_data = WSWAPchar(dma_addr);
				CHECK_WBACK_INV(lp, rbd, sizeof(struct i596_rbd));
			}
			else
				skb = dev_alloc_skb(pkt_len + 2);
memory_squeeze:
			if (skb == NULL) {
				/* XXX tulip.c can defer packets here!! */
				printk("%s: i596_rx Memory squeeze, dropping packet.\n", dev->name);
				lp->stats.rx_dropped++;
			}
			else {
				skb->dev = dev;
				if (!rx_in_place) {
					/* 16 byte align the data fields */
					dma_sync_single_for_cpu(lp->dev, (dma_addr_t)WSWAPchar(rbd->b_data), PKT_BUF_SZ, DMA_FROM_DEVICE);
					skb_reserve(skb, 2);
					memcpy(skb_put(skb,pkt_len), rbd->v_data, pkt_len);
					dma_sync_single_for_device(lp->dev, (dma_addr_t)WSWAPchar(rbd->b_data), PKT_BUF_SZ, DMA_FROM_DEVICE);
				}
				skb->len = pkt_len;
				skb->protocol=eth_type_trans(skb,dev);
				netif_rx(skb);
				dev->last_rx = jiffies;
				lp->stats.rx_packets++;
				lp->stats.rx_bytes+=pkt_len;
			}
		}
		else {
			DEB(DEB_ERRORS, printk("%s: Error, rfd.stat = 0x%04x\n",
					dev->name, rfd->stat));
			lp->stats.rx_errors++;
			if ((rfd->stat) & 0x0001)
				lp->stats.collisions++;
			if ((rfd->stat) & 0x0080)
				lp->stats.rx_length_errors++;
			if ((rfd->stat) & 0x0100)
				lp->stats.rx_over_errors++;
			if ((rfd->stat) & 0x0200)
				lp->stats.rx_fifo_errors++;
			if ((rfd->stat) & 0x0400)
				lp->stats.rx_frame_errors++;
			if ((rfd->stat) & 0x0800)
				lp->stats.rx_crc_errors++;
			if ((rfd->stat) & 0x1000)
				lp->stats.rx_length_errors++;
		}

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

		if (rbd != NULL && (rbd->count & 0x4000)) {
			rbd->count = 0;
			lp->rbd_head = rbd->v_next;
			CHECK_WBACK_INV(lp, rbd, sizeof(struct i596_rbd));
		}

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

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

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

		rfd->v_prev->cmd = CMD_FLEX;

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

		lp->scb.rfd = rfd->b_next;
		lp->rfd_head = rfd->v_next;
		CHECK_WBACK_INV(lp, rfd->v_prev, sizeof(struct i596_rfd));
		CHECK_WBACK_INV(lp, rfd, sizeof(struct i596_rfd));
		rfd = lp->rfd_head;
		CHECK_INV(lp, rfd, sizeof(struct i596_rfd));
	}

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

	return 0;
}


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

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

		switch ((ptr->command) & 0x7) {
		case CmdTx:
			{
				struct tx_cmd *tx_cmd = (struct tx_cmd *) ptr;
				struct sk_buff *skb = tx_cmd->skb;
				dma_unmap_single(lp->dev, tx_cmd->dma_addr, skb->len, DMA_TO_DEVICE);

				dev_kfree_skb(skb);

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

				ptr->v_next = NULL;
				ptr->b_next = I596_NULL;
				tx_cmd->cmd.command = 0;  /* Mark as free */
				break;
			}
		default:
			ptr->v_next = NULL;
			ptr->b_next = I596_NULL;
		}
		CHECK_WBACK_INV(lp, ptr, sizeof(struct i596_cmd));
	}

	wait_cmd(dev, lp, 100, "i596_cleanup_cmd timed out");
	lp->scb.cmd = I596_NULL;
	CHECK_WBACK(lp, &(lp->scb), sizeof(struct i596_scb));
}


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

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

	spin_lock_irqsave (&lp->lock, flags);

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

	netif_stop_queue(dev);

	/* FIXME: this command might cause an lpmc */
	lp->scb.command = CUC_ABORT | RX_ABORT;
	CHECK_WBACK(lp, &(lp->scb), sizeof(struct i596_scb));
	CA(dev);

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

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

	netif_start_queue(dev);
	init_i596_mem(dev);
}


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

	DEB(DEB_ADDCMD, printk("i596_add_cmd cmd_head %p\n", lp->cmd_head));

	cmd->status = 0;
	cmd->command |= (CMD_EOL | CMD_INTR);
	cmd->v_next = NULL;
	cmd->b_next = I596_NULL;
	CHECK_WBACK(lp, cmd, sizeof(struct i596_cmd));

	spin_lock_irqsave (&lp->lock, flags);

	if (lp->cmd_head != NULL) {
		lp->cmd_tail->v_next = cmd;
		lp->cmd_tail->b_next = WSWAPcmd(virt_to_dma(lp,&cmd->status));
		CHECK_WBACK(lp, lp->cmd_tail, sizeof(struct i596_cmd));
	} else {
		lp->cmd_head = cmd;
		wait_cmd(dev, lp, 100, "i596_add_cmd timed out");
		lp->scb.cmd = WSWAPcmd(virt_to_dma(lp,&cmd->status));
		lp->scb.command = CUC_START;
		CHECK_WBACK(lp, &(lp->scb), sizeof(struct i596_scb));
		CA(dev);
	}
	lp->cmd_tail = cmd;
	lp->cmd_backlog++;

	spin_unlock_irqrestore (&lp->lock, flags);

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

		if (tickssofar < ticks_limit)
			return;

		printk("%s: command unit timed out, status resetting.\n", dev->name);
#if 1
		i596_reset(dev, lp);
#endif
	}
}

#if 0
/* this function makes a perfectly adequate probe...  but we have a
   device list */
static int i596_test(struct net_device *dev)
{
	struct i596_private *lp = dev->priv;
	volatile int *tint;
	u32 data;

	tint = (volatile int *)(&(lp->scp));
	data = virt_to_dma(lp,tint);

	tint[1] = -1;
	CHECK_WBACK(lp, tint, PAGE_SIZE);

	MPU_PORT(dev, 1, data);

	for(data = 1000000; data; data--) {
		CHECK_INV(lp, tint, PAGE_SIZE);
		if(tint[1] != -1)
			break;

	}

	printk("i596_test result %d\n", tint[1]);

}
#endif


static int i596_open(struct net_device *dev)
{
	DEB(DEB_OPEN, printk("%s: i596_open() irq %d.\n", dev->name, dev->irq));

	if (request_irq(dev->irq, &i596_interrupt, 0, "i82596", dev)) {
		printk("%s: IRQ %d not free\n", dev->name, dev->irq);
		goto out;
	}

	init_rx_bufs(dev);

	if (init_i596_mem(dev)) {
		printk("%s: Failed to init memory\n", dev->name);
		goto out_remove_rx_bufs;
	}

	netif_start_queue(dev);

	return 0;

out_remove_rx_bufs:
	remove_rx_bufs(dev);
	free_irq(dev->irq, dev);
out:
	return -EAGAIN;
}

static void i596_tx_timeout (struct net_device *dev)
{
	struct i596_private *lp = dev->priv;

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

	lp->stats.tx_errors++;

	/* Try to restart the adaptor */
	if (lp->last_restart == lp->stats.tx_packets) {
		DEB(DEB_ERRORS, printk("Resetting board.\n"));
		/* Shutdown and restart */
		i596_reset (dev, lp);
	} else {
		/* Issue a channel attention signal */
		DEB(DEB_ERRORS, printk("Kicking board.\n"));
		lp->scb.command = CUC_START | RX_START;
		CHECK_WBACK_INV(lp, &(lp->scb), sizeof(struct i596_scb));
		CA (dev);
		lp->last_restart = lp->stats.tx_packets;
	}

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


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

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

	if (length < ETH_ZLEN) {
		if (skb_padto(skb, ETH_ZLEN))
			return 0;
		length = ETH_ZLEN;
	}

	netif_stop_queue(dev);

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

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

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

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

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

		tx_cmd->dma_addr = dma_map_single(lp->dev, skb->data, skb->len,
				DMA_TO_DEVICE);
		tbd->data = WSWAPchar(tx_cmd->dma_addr);

		DEB(DEB_TXADDR,print_eth(skb->data, "tx-queued"));
		CHECK_WBACK_INV(lp, tx_cmd, sizeof(struct tx_cmd));
		CHECK_WBACK_INV(lp, tbd, sizeof(struct i596_tbd));
		i596_add_cmd(dev, &tx_cmd->cmd);

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

	netif_start_queue(dev);

	return 0;
}

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

	printk("i596 0x%p, ", add);
	for (i = 0; i < 6; i++)
		printk(" %02X", add[i + 6]);
	printk(" -->");
	for (i = 0; i < 6; i++)
		printk(" %02X", add[i]);
	printk(" %02X%02X, %s\n", add[12], add[13], str);
}


#define LAN_PROM_ADDR	0xF0810000

static int __devinit i82596_probe(struct net_device *dev,
				  struct device *gen_dev)
{
	int i;
	struct i596_private *lp;
	char eth_addr[6];
	dma_addr_t dma_addr;

	/* This lot is ensure things have been cache line aligned. */
	BUILD_BUG_ON(sizeof(struct i596_rfd) != 32);
	BUILD_BUG_ON(sizeof(struct i596_rbd) &  31);
	BUILD_BUG_ON(sizeof(struct tx_cmd)   &  31);
	BUILD_BUG_ON(sizeof(struct i596_tbd) != 32);
#ifndef __LP64__
	BUILD_BUG_ON(sizeof(struct i596_private) > 4096);
#endif

	if (!dev->base_addr || !dev->irq)
		return -ENODEV;

	if (pdc_lan_station_id(eth_addr, dev->base_addr)) {
		for (i=0; i < 6; i++) {
			eth_addr[i] = gsc_readb(LAN_PROM_ADDR + i);
		}
		printk(KERN_INFO "%s: MAC of HP700 LAN read from EEPROM\n", __FILE__);
	}

	dev->mem_start = (unsigned long) dma_alloc_noncoherent(gen_dev,
		sizeof(struct i596_private), &dma_addr, GFP_KERNEL);
	if (!dev->mem_start) {
		printk(KERN_ERR "%s: Couldn't get shared memory\n", __FILE__);
		return -ENOMEM;
	}

	for (i = 0; i < 6; i++)
		dev->dev_addr[i] = eth_addr[i];

	/* The 82596-specific entries in the device structure. */
	dev->open = i596_open;
	dev->stop = i596_close;
	dev->hard_start_xmit = i596_start_xmit;
	dev->get_stats = i596_get_stats;
	dev->set_multicast_list = set_multicast_list;
	dev->tx_timeout = i596_tx_timeout;
	dev->watchdog_timeo = TX_TIMEOUT;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = i596_poll_controller;
#endif

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

	lp = dev->priv;
	memset(lp, 0, sizeof(struct i596_private));

	lp->scb.command = 0;
	lp->scb.cmd = I596_NULL;
	lp->scb.rfd = I596_NULL;
	spin_lock_init(&lp->lock);
	lp->dma_addr = dma_addr;
	lp->dev = gen_dev;

	CHECK_WBACK_INV(lp, dev->mem_start, sizeof(struct i596_private));

	i = register_netdev(dev);
	if (i) {
		lp = dev->priv;
		dma_free_noncoherent(lp->dev, sizeof(struct i596_private),
				    (void *)dev->mem_start, lp->dma_addr);
		return i;
	};

	DEB(DEB_PROBE, printk(KERN_INFO "%s: 82596 at %#3lx,", dev->name, dev->base_addr));
	for (i = 0; i < 6; i++)
		DEB(DEB_PROBE, printk(" %2.2X", dev->dev_addr[i]));
	DEB(DEB_PROBE, printk(" IRQ %d.\n", dev->irq));
	DEB(DEB_INIT, printk(KERN_INFO "%s: lp at 0x%p (%d bytes), lp->scb at 0x%p\n",
		dev->name, lp, (int)sizeof(struct i596_private), &lp->scb));

	return 0;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void i596_poll_controller(struct net_device *dev)
{
	disable_irq(dev->irq);
	i596_interrupt(dev->irq, dev);
	enable_irq(dev->irq);
}
#endif

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

	if (dev == NULL) {
		printk("%s: irq %d for unknown device.\n", __FUNCTION__, irq);
		return IRQ_NONE;
	}

	lp = dev->priv;

	spin_lock (&lp->lock);

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

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

	ack_cmd = status & 0xf000;

	if (!ack_cmd) {
		DEB(DEB_ERRORS, printk("%s: interrupt with no events\n", dev->name));
		spin_unlock (&lp->lock);
		return IRQ_NONE;
	}

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

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

		while (lp->cmd_head != NULL) {
			CHECK_INV(lp, lp->cmd_head, sizeof(struct i596_cmd));
			if (!(lp->cmd_head->status & STAT_C))
				break;

			ptr = lp->cmd_head;

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

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

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

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

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

					DEB(DEB_TDR, printk("%s: Time %d.\n", dev->name, status & 0x07ff));
				}
				break;
			    }
			case CmdConfigure:
				/* Zap command so set_multicast_list() knows it is free */
				ptr->command = 0;
				break;
			}
			ptr->v_next = NULL;
		        ptr->b_next = I596_NULL;
			CHECK_WBACK(lp, ptr, sizeof(struct i596_cmd));
			lp->last_cmd = jiffies;
		}

		/* This mess is arranging that only the last of any outstanding
		 * commands has the interrupt bit set.  Should probably really
		 * only add to the cmd queue when the CU is stopped.
		 */
		ptr = lp->cmd_head;
		while ((ptr != NULL) && (ptr != lp->cmd_tail)) {
			struct i596_cmd *prev = ptr;

			ptr->command &= 0x1fff;
			ptr = ptr->v_next;
			CHECK_WBACK_INV(lp, prev, sizeof(struct i596_cmd));
		}

		if ((lp->cmd_head != NULL))
			ack_cmd |= CUC_START;
		lp->scb.cmd = WSWAPcmd(virt_to_dma(lp,&lp->cmd_head->status));
		CHECK_WBACK_INV(lp, &lp->scb, sizeof(struct i596_scb));
	}
	if ((status & 0x1000) || (status & 0x4000)) {
		if ((status & 0x4000))
			DEB(DEB_INTS, printk("%s: i596 interrupt received a frame.\n", dev->name));
		i596_rx(dev);
		/* Only RX_START if stopped - RGH 07-07-96 */
		if (status & 0x1000) {
			if (netif_running(dev)) {
				DEB(DEB_ERRORS, printk("%s: i596 interrupt receive unit inactive, status 0x%x\n", dev->name, status));
				ack_cmd |= RX_START;
				lp->stats.rx_errors++;
				lp->stats.rx_fifo_errors++;
				rebuild_rx_bufs(dev);
			}
		}
	}
	wait_cmd(dev, lp, 100, "i596 interrupt, timeout");
	lp->scb.command = ack_cmd;
	CHECK_WBACK(lp, &lp->scb, sizeof(struct i596_scb));

	/* DANGER: I suspect that some kind of interrupt
	 acknowledgement aside from acking the 82596 might be needed
	 here...  but it's running acceptably without */

	CA(dev);

	wait_cmd(dev, lp, 100, "i596 interrupt, exit timeout");
	DEB(DEB_INTS, printk("%s: exiting interrupt.\n", dev->name));

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

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

	netif_stop_queue(dev);

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

	spin_lock_irqsave(&lp->lock, flags);

	wait_cmd(dev, lp, 100, "close1 timed out");
	lp->scb.command = CUC_ABORT | RX_ABORT;
	CHECK_WBACK(lp, &lp->scb, sizeof(struct i596_scb));

	CA(dev);

	wait_cmd(dev, lp, 100, "close2 timed out");
	spin_unlock_irqrestore(&lp->lock, flags);
	DEB(DEB_STRUCT,i596_display_data(dev));
	i596_cleanup_cmd(dev,lp);

	disable_irq(dev->irq);

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

	return 0;
}

static struct net_device_stats *
 i596_get_stats(struct net_device *dev)
{
	struct i596_private *lp = dev->priv;

	return &lp->stats;
}

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

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

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

	if ((dev->flags & IFF_PROMISC) && !(lp->cf_cmd.i596_config[8] & 0x01)) {
		lp->cf_cmd.i596_config[8] |= 0x01;
		config = 1;
	}
	if (!(dev->flags & IFF_PROMISC) && (lp->cf_cmd.i596_config[8] & 0x01)) {
		lp->cf_cmd.i596_config[8] &= ~0x01;
		config = 1;
	}
	if ((dev->flags & IFF_ALLMULTI) && (lp->cf_cmd.i596_config[11] & 0x20)) {
		lp->cf_cmd.i596_config[11] &= ~0x20;
		config = 1;
	}
	if (!(dev->flags & IFF_ALLMULTI) && !(lp->cf_cmd.i596_config[11] & 0x20)) {
		lp->cf_cmd.i596_config[11] |= 0x20;
		config = 1;
	}
	if (config) {
		if (lp->cf_cmd.cmd.command)
			printk("%s: config change request already queued\n",
			       dev->name);
		else {
			lp->cf_cmd.cmd.command = CmdConfigure;
			CHECK_WBACK_INV(lp, &lp->cf_cmd, sizeof(struct cf_cmd));
			i596_add_cmd(dev, &lp->cf_cmd.cmd);
		}
	}

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

	if (dev->mc_count > 0) {
		struct dev_mc_list *dmi;
		unsigned char *cp;
		struct mc_cmd *cmd;

		cmd = &lp->mc_cmd;
		cmd->cmd.command = CmdMulticastList;
		cmd->mc_cnt = dev->mc_count * 6;
		cp = cmd->mc_addrs;
		for (dmi = dev->mc_list; cnt && dmi != NULL; dmi = dmi->next, cnt--, cp += 6) {
			memcpy(cp, dmi->dmi_addr, 6);
			if (i596_debug > 1)
				DEB(DEB_MULTI, printk("%s: Adding address %02x:%02x:%02x:%02x:%02x:%02x\n",
						dev->name, cp[0],cp[1],cp[2],cp[3],cp[4],cp[5]));
		}
		CHECK_WBACK_INV(lp, &lp->mc_cmd, sizeof(struct mc_cmd));
		i596_add_cmd(dev, &cmd->cmd);
	}
}

static int debug = -1;
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "lasi_82596 debug mask");

static int num_drivers;
static struct net_device *netdevs[MAX_DRIVERS];

static int __devinit
lan_init_chip(struct parisc_device *dev)
{
	struct	net_device *netdevice;
	int	retval;

	if (num_drivers >= MAX_DRIVERS) {
		/* max count of possible i82596 drivers reached */
		return -ENOMEM;
	}

	if (num_drivers == 0)
		printk(KERN_INFO LASI_82596_DRIVER_VERSION "\n");

	if (!dev->irq) {
		printk(KERN_ERR "%s: IRQ not found for i82596 at 0x%lx\n",
			__FILE__, dev->hpa.start);
		return -ENODEV;
	}

	printk(KERN_INFO "Found i82596 at 0x%lx, IRQ %d\n", dev->hpa.start,
			dev->irq);

	netdevice = alloc_etherdev(0);
	if (!netdevice)
		return -ENOMEM;

	netdevice->base_addr = dev->hpa.start;
	netdevice->irq = dev->irq;

	retval = i82596_probe(netdevice, &dev->dev);
	if (retval) {
		free_netdev(netdevice);
		return -ENODEV;
	}

	if (dev->id.sversion == 0x72) {
		((struct i596_private *)netdevice->priv)->options = OPT_SWAP_PORT;
	}

	netdevs[num_drivers++] = netdevice;

	return retval;
}


static struct parisc_device_id lan_tbl[] = {
	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008a },
	{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00072 },
	{ 0, }
};

MODULE_DEVICE_TABLE(parisc, lan_tbl);

static struct parisc_driver lan_driver = {
	.name		= "lasi_82596",
	.id_table	= lan_tbl,
	.probe		= lan_init_chip,
};

static int __devinit lasi_82596_init(void)
{
	if (debug >= 0)
		i596_debug = debug;
	return register_parisc_driver(&lan_driver);
}

module_init(lasi_82596_init);

static void __exit lasi_82596_exit(void)
{
	int i;

	for (i=0; i<MAX_DRIVERS; i++) {
		struct i596_private *lp;
		struct net_device *netdevice;

		netdevice = netdevs[i];
		if (!netdevice)
			continue;

		unregister_netdev(netdevice);

		lp = netdevice->priv;
		dma_free_noncoherent(lp->dev, sizeof(struct i596_private),
				       (void *)netdevice->mem_start, lp->dma_addr);
		free_netdev(netdevice);
	}
	num_drivers = 0;

	unregister_parisc_driver(&lan_driver);
}

module_exit(lasi_82596_exit);
OpenPOWER on IntegriCloud