summaryrefslogtreecommitdiffstats
path: root/drivers/net/cris/eth_v10.c
blob: a24be34a3f7ad3b0adc00268ab3854527817b1c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
/*
 * e100net.c: A network driver for the ETRAX 100LX network controller.
 *
 * Copyright (c) 1998-2002 Axis Communications AB.
 *
 * The outline of this driver comes from skeleton.c.
 *
 */


#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/bitops.h>

#include <linux/if.h>
#include <linux/mii.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/ethtool.h>

#include <arch/svinto.h>/* DMA and register descriptions */
#include <asm/io.h>         /* CRIS_LED_* I/O functions */
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/system.h>
#include <asm/ethernet.h>
#include <asm/cache.h>
#include <arch/io_interface_mux.h>

//#define ETHDEBUG
#define D(x)

/*
 * The name of the card. Is used for messages and in the requests for
 * io regions, irqs and dma channels
 */

static const char* cardname = "ETRAX 100LX built-in ethernet controller";

/* A default ethernet address. Highlevel SW will set the real one later */

static struct sockaddr default_mac = {
	0,
	{ 0x00, 0x40, 0x8C, 0xCD, 0x00, 0x00 }
};

/* Information that need to be kept for each board. */
struct net_local {
	struct net_device_stats stats;
	struct mii_if_info mii_if;

	/* Tx control lock.  This protects the transmit buffer ring
	 * state along with the "tx full" state of the driver.  This
	 * means all netif_queue flow control actions are protected
	 * by this lock as well.
	 */
	spinlock_t lock;

	spinlock_t led_lock; /* Protect LED state */
	spinlock_t transceiver_lock; /* Protect transceiver state. */
};

typedef struct etrax_eth_descr
{
	etrax_dma_descr descr;
	struct sk_buff* skb;
} etrax_eth_descr;

/* Some transceivers requires special handling */
struct transceiver_ops
{
	unsigned int oui;
	void (*check_speed)(struct net_device* dev);
	void (*check_duplex)(struct net_device* dev);
};

/* Duplex settings */
enum duplex
{
	half,
	full,
	autoneg
};

/* Dma descriptors etc. */

#define MAX_MEDIA_DATA_SIZE 1522

#define MIN_PACKET_LEN      46
#define ETHER_HEAD_LEN      14

/*
** MDIO constants.
*/
#define MDIO_START                          0x1
#define MDIO_READ                           0x2
#define MDIO_WRITE                          0x1
#define MDIO_PREAMBLE              0xfffffffful

/* Broadcom specific */
#define MDIO_AUX_CTRL_STATUS_REG           0x18
#define MDIO_BC_FULL_DUPLEX_IND             0x1
#define MDIO_BC_SPEED                       0x2

/* TDK specific */
#define MDIO_TDK_DIAGNOSTIC_REG              18
#define MDIO_TDK_DIAGNOSTIC_RATE          0x400
#define MDIO_TDK_DIAGNOSTIC_DPLX          0x800

/*Intel LXT972A specific*/
#define MDIO_INT_STATUS_REG_2			0x0011
#define MDIO_INT_FULL_DUPLEX_IND       (1 << 9)
#define MDIO_INT_SPEED                (1 << 14)

/* Network flash constants */
#define NET_FLASH_TIME                  (HZ/50) /* 20 ms */
#define NET_FLASH_PAUSE                (HZ/100) /* 10 ms */
#define NET_LINK_UP_CHECK_INTERVAL       (2*HZ) /* 2 s   */
#define NET_DUPLEX_CHECK_INTERVAL        (2*HZ) /* 2 s   */

#define NO_NETWORK_ACTIVITY 0
#define NETWORK_ACTIVITY    1

#define NBR_OF_RX_DESC     32
#define NBR_OF_TX_DESC     16

/* Large packets are sent directly to upper layers while small packets are */
/* copied (to reduce memory waste). The following constant decides the breakpoint */
#define RX_COPYBREAK 256

/* Due to a chip bug we need to flush the cache when descriptors are returned */
/* to the DMA. To decrease performance impact we return descriptors in chunks. */
/* The following constant determines the number of descriptors to return. */
#define RX_QUEUE_THRESHOLD  NBR_OF_RX_DESC/2

#define GET_BIT(bit,val)   (((val) >> (bit)) & 0x01)

/* Define some macros to access ETRAX 100 registers */
#define SETF(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
					  IO_FIELD_(reg##_, field##_, val)
#define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
					  IO_STATE_(reg##_, field##_, _##val)

static etrax_eth_descr *myNextRxDesc;  /* Points to the next descriptor to
                                          to be processed */
static etrax_eth_descr *myLastRxDesc;  /* The last processed descriptor */

static etrax_eth_descr RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned(32)));

static etrax_eth_descr* myFirstTxDesc; /* First packet not yet sent */
static etrax_eth_descr* myLastTxDesc;  /* End of send queue */
static etrax_eth_descr* myNextTxDesc;  /* Next descriptor to use */
static etrax_eth_descr TxDescList[NBR_OF_TX_DESC] __attribute__ ((aligned(32)));

static unsigned int network_rec_config_shadow = 0;

static unsigned int network_tr_ctrl_shadow = 0;

/* Network speed indication. */
static DEFINE_TIMER(speed_timer, NULL, 0, 0);
static DEFINE_TIMER(clear_led_timer, NULL, 0, 0);
static int current_speed; /* Speed read from transceiver */
static int current_speed_selection; /* Speed selected by user */
static unsigned long led_next_time;
static int led_active;
static int rx_queue_len;

/* Duplex */
static DEFINE_TIMER(duplex_timer, NULL, 0, 0);
static int full_duplex;
static enum duplex current_duplex;

/* Index to functions, as function prototypes. */

static int etrax_ethernet_init(void);

static int e100_open(struct net_device *dev);
static int e100_set_mac_address(struct net_device *dev, void *addr);
static int e100_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t e100rxtx_interrupt(int irq, void *dev_id);
static irqreturn_t e100nw_interrupt(int irq, void *dev_id);
static void e100_rx(struct net_device *dev);
static int e100_close(struct net_device *dev);
static int e100_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);
static int e100_set_config(struct net_device* dev, struct ifmap* map);
static void e100_tx_timeout(struct net_device *dev);
static struct net_device_stats *e100_get_stats(struct net_device *dev);
static void set_multicast_list(struct net_device *dev);
static void e100_hardware_send_packet(struct net_local* np, char *buf, int length);
static void update_rx_stats(struct net_device_stats *);
static void update_tx_stats(struct net_device_stats *);
static int e100_probe_transceiver(struct net_device* dev);

static void e100_check_speed(unsigned long priv);
static void e100_set_speed(struct net_device* dev, unsigned long speed);
static void e100_check_duplex(unsigned long priv);
static void e100_set_duplex(struct net_device* dev, enum duplex);
static void e100_negotiate(struct net_device* dev);

static int e100_get_mdio_reg(struct net_device *dev, int phy_id, int location);
static void e100_set_mdio_reg(struct net_device *dev, int phy_id, int location, int value);

static void e100_send_mdio_cmd(unsigned short cmd, int write_cmd);
static void e100_send_mdio_bit(unsigned char bit);
static unsigned char e100_receive_mdio_bit(void);
static void e100_reset_transceiver(struct net_device* net);

static void e100_clear_network_leds(unsigned long dummy);
static void e100_set_network_leds(int active);

static const struct ethtool_ops e100_ethtool_ops;
#if defined(CONFIG_ETRAX_NO_PHY)
static void dummy_check_speed(struct net_device* dev);
static void dummy_check_duplex(struct net_device* dev);
#else
static void broadcom_check_speed(struct net_device* dev);
static void broadcom_check_duplex(struct net_device* dev);
static void tdk_check_speed(struct net_device* dev);
static void tdk_check_duplex(struct net_device* dev);
static void intel_check_speed(struct net_device* dev);
static void intel_check_duplex(struct net_device* dev);
static void generic_check_speed(struct net_device* dev);
static void generic_check_duplex(struct net_device* dev);
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
static void e100_netpoll(struct net_device* dev);
#endif

static int autoneg_normal = 1;

struct transceiver_ops transceivers[] =
{
#if defined(CONFIG_ETRAX_NO_PHY)
	{0x0000, dummy_check_speed, dummy_check_duplex}        /* Dummy */
#else
	{0x1018, broadcom_check_speed, broadcom_check_duplex},  /* Broadcom */
	{0xC039, tdk_check_speed, tdk_check_duplex},            /* TDK 2120 */
	{0x039C, tdk_check_speed, tdk_check_duplex},            /* TDK 2120C */
        {0x04de, intel_check_speed, intel_check_duplex},     	/* Intel LXT972A*/
	{0x0000, generic_check_speed, generic_check_duplex}     /* Generic, must be last */
#endif
};

struct transceiver_ops* transceiver = &transceivers[0];

static const struct net_device_ops e100_netdev_ops = {
	.ndo_open		= e100_open,
	.ndo_stop		= e100_close,
	.ndo_start_xmit		= e100_send_packet,
	.ndo_tx_timeout		= e100_tx_timeout,
	.ndo_get_stats		= e100_get_stats,
	.ndo_set_multicast_list	= set_multicast_list,
	.ndo_do_ioctl		= e100_ioctl,
	.ndo_set_mac_address	= e100_set_mac_address,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_set_config		= e100_set_config,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= e100_netpoll,
#endif
};

#define tx_done(dev) (*R_DMA_CH0_CMD == 0)

/*
 * Check for a network adaptor of this type, and return '0' if one exists.
 * If dev->base_addr == 0, probe all likely locations.
 * If dev->base_addr == 1, always return failure.
 * If dev->base_addr == 2, allocate space for the device and return success
 * (detachable devices only).
 */

static int __init
etrax_ethernet_init(void)
{
	struct net_device *dev;
        struct net_local* np;
	int i, err;

	printk(KERN_INFO
	       "ETRAX 100LX 10/100MBit ethernet v2.0 (c) 1998-2007 Axis Communications AB\n");

	if (cris_request_io_interface(if_eth, cardname)) {
		printk(KERN_CRIT "etrax_ethernet_init failed to get IO interface\n");
		return -EBUSY;
	}

	dev = alloc_etherdev(sizeof(struct net_local));
	if (!dev)
		return -ENOMEM;

	np = netdev_priv(dev);

	/* we do our own locking */
	dev->features |= NETIF_F_LLTX;

	dev->base_addr = (unsigned int)R_NETWORK_SA_0; /* just to have something to show */

	/* now setup our etrax specific stuff */

	dev->irq = NETWORK_DMA_RX_IRQ_NBR; /* we really use DMATX as well... */
	dev->dma = NETWORK_RX_DMA_NBR;

	/* fill in our handlers so the network layer can talk to us in the future */

	dev->ethtool_ops	= &e100_ethtool_ops;
	dev->netdev_ops		= &e100_netdev_ops;

	spin_lock_init(&np->lock);
	spin_lock_init(&np->led_lock);
	spin_lock_init(&np->transceiver_lock);

	/* Initialise the list of Etrax DMA-descriptors */

	/* Initialise receive descriptors */

	for (i = 0; i < NBR_OF_RX_DESC; i++) {
		/* Allocate two extra cachelines to make sure that buffer used
		 * by DMA does not share cacheline with any other data (to
		 * avoid cache bug)
		 */
		RxDescList[i].skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);
		if (!RxDescList[i].skb)
			return -ENOMEM;
		RxDescList[i].descr.ctrl   = 0;
		RxDescList[i].descr.sw_len = MAX_MEDIA_DATA_SIZE;
		RxDescList[i].descr.next   = virt_to_phys(&RxDescList[i + 1]);
		RxDescList[i].descr.buf    = L1_CACHE_ALIGN(virt_to_phys(RxDescList[i].skb->data));
		RxDescList[i].descr.status = 0;
		RxDescList[i].descr.hw_len = 0;
		prepare_rx_descriptor(&RxDescList[i].descr);
	}

	RxDescList[NBR_OF_RX_DESC - 1].descr.ctrl   = d_eol;
	RxDescList[NBR_OF_RX_DESC - 1].descr.next   = virt_to_phys(&RxDescList[0]);
	rx_queue_len = 0;

	/* Initialize transmit descriptors */
	for (i = 0; i < NBR_OF_TX_DESC; i++) {
		TxDescList[i].descr.ctrl   = 0;
		TxDescList[i].descr.sw_len = 0;
		TxDescList[i].descr.next   = virt_to_phys(&TxDescList[i + 1].descr);
		TxDescList[i].descr.buf    = 0;
		TxDescList[i].descr.status = 0;
		TxDescList[i].descr.hw_len = 0;
		TxDescList[i].skb = 0;
	}

	TxDescList[NBR_OF_TX_DESC - 1].descr.ctrl   = d_eol;
	TxDescList[NBR_OF_TX_DESC - 1].descr.next   = virt_to_phys(&TxDescList[0].descr);

	/* Initialise initial pointers */

	myNextRxDesc  = &RxDescList[0];
	myLastRxDesc  = &RxDescList[NBR_OF_RX_DESC - 1];
	myFirstTxDesc = &TxDescList[0];
	myNextTxDesc  = &TxDescList[0];
	myLastTxDesc  = &TxDescList[NBR_OF_TX_DESC - 1];

	/* Register device */
	err = register_netdev(dev);
	if (err) {
		free_netdev(dev);
		return err;
	}

	/* set the default MAC address */

	e100_set_mac_address(dev, &default_mac);

	/* Initialize speed indicator stuff. */

	current_speed = 10;
	current_speed_selection = 0; /* Auto */
	speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;
	speed_timer.data = (unsigned long)dev;
	speed_timer.function = e100_check_speed;

	clear_led_timer.function = e100_clear_network_leds;
	clear_led_timer.data = (unsigned long)dev;

	full_duplex = 0;
	current_duplex = autoneg;
	duplex_timer.expires = jiffies + NET_DUPLEX_CHECK_INTERVAL;
        duplex_timer.data = (unsigned long)dev;
	duplex_timer.function = e100_check_duplex;

        /* Initialize mii interface */
	np->mii_if.phy_id_mask = 0x1f;
	np->mii_if.reg_num_mask = 0x1f;
	np->mii_if.dev = dev;
	np->mii_if.mdio_read = e100_get_mdio_reg;
	np->mii_if.mdio_write = e100_set_mdio_reg;

	/* Initialize group address registers to make sure that no */
	/* unwanted addresses are matched */
	*R_NETWORK_GA_0 = 0x00000000;
	*R_NETWORK_GA_1 = 0x00000000;

	/* Initialize next time the led can flash */
	led_next_time = jiffies;
	return 0;
}

/* set MAC address of the interface. called from the core after a
 * SIOCSIFADDR ioctl, and from the bootup above.
 */

static int
e100_set_mac_address(struct net_device *dev, void *p)
{
	struct net_local *np = netdev_priv(dev);
	struct sockaddr *addr = p;

	spin_lock(&np->lock); /* preemption protection */

	/* remember it */

	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

	/* Write it to the hardware.
	 * Note the way the address is wrapped:
	 * *R_NETWORK_SA_0 = a0_0 | (a0_1 << 8) | (a0_2 << 16) | (a0_3 << 24);
	 * *R_NETWORK_SA_1 = a0_4 | (a0_5 << 8);
	 */

	*R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
		(dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
	*R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
	*R_NETWORK_SA_2 = 0;

	/* show it in the log as well */

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

	spin_unlock(&np->lock);

	return 0;
}

/*
 * Open/initialize the board. This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */

static int
e100_open(struct net_device *dev)
{
	unsigned long flags;

	/* enable the MDIO output pin */

	*R_NETWORK_MGM_CTRL = IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable);

	*R_IRQ_MASK0_CLR =
		IO_STATE(R_IRQ_MASK0_CLR, overrun, clr) |
		IO_STATE(R_IRQ_MASK0_CLR, underrun, clr) |
		IO_STATE(R_IRQ_MASK0_CLR, excessive_col, clr);

	/* clear dma0 and 1 eop and descr irq masks */
	*R_IRQ_MASK2_CLR =
		IO_STATE(R_IRQ_MASK2_CLR, dma0_descr, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma0_eop, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma1_descr, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma1_eop, clr);

	/* Reset and wait for the DMA channels */

	RESET_DMA(NETWORK_TX_DMA_NBR);
	RESET_DMA(NETWORK_RX_DMA_NBR);
	WAIT_DMA(NETWORK_TX_DMA_NBR);
	WAIT_DMA(NETWORK_RX_DMA_NBR);

	/* Initialise the etrax network controller */

	/* allocate the irq corresponding to the receiving DMA */

	if (request_irq(NETWORK_DMA_RX_IRQ_NBR, e100rxtx_interrupt,
			IRQF_SAMPLE_RANDOM, cardname, (void *)dev)) {
		goto grace_exit0;
	}

	/* allocate the irq corresponding to the transmitting DMA */

	if (request_irq(NETWORK_DMA_TX_IRQ_NBR, e100rxtx_interrupt, 0,
			cardname, (void *)dev)) {
		goto grace_exit1;
	}

	/* allocate the irq corresponding to the network errors etc */

	if (request_irq(NETWORK_STATUS_IRQ_NBR, e100nw_interrupt, 0,
			cardname, (void *)dev)) {
		goto grace_exit2;
	}

	/*
	 * Always allocate the DMA channels after the IRQ,
	 * and clean up on failure.
	 */

	if (cris_request_dma(NETWORK_TX_DMA_NBR,
	                     cardname,
	                     DMA_VERBOSE_ON_ERROR,
	                     dma_eth)) {
		goto grace_exit3;
        }

	if (cris_request_dma(NETWORK_RX_DMA_NBR,
	                     cardname,
	                     DMA_VERBOSE_ON_ERROR,
	                     dma_eth)) {
		goto grace_exit4;
        }

	/* give the HW an idea of what MAC address we want */

	*R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
		(dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
	*R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
	*R_NETWORK_SA_2 = 0;

#if 0
	/* use promiscuous mode for testing */
	*R_NETWORK_GA_0 = 0xffffffff;
	*R_NETWORK_GA_1 = 0xffffffff;

	*R_NETWORK_REC_CONFIG = 0xd; /* broadcast rec, individ. rec, ma0 enabled */
#else
	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, max_size, size1522);
	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, broadcast, receive);
	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, ma0, enable);
	SETF(network_rec_config_shadow, R_NETWORK_REC_CONFIG, duplex, full_duplex);
	*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
#endif

	*R_NETWORK_GEN_CONFIG =
		IO_STATE(R_NETWORK_GEN_CONFIG, phy,    mii_clk) |
		IO_STATE(R_NETWORK_GEN_CONFIG, enable, on);

	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, delay, none);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cancel, dont);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cd, enable);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, retry, enable);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, pad, enable);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, crc, enable);
	*R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;

	local_irq_save(flags);

	/* enable the irq's for ethernet DMA */

	*R_IRQ_MASK2_SET =
		IO_STATE(R_IRQ_MASK2_SET, dma0_eop, set) |
		IO_STATE(R_IRQ_MASK2_SET, dma1_eop, set);

	*R_IRQ_MASK0_SET =
		IO_STATE(R_IRQ_MASK0_SET, overrun,       set) |
		IO_STATE(R_IRQ_MASK0_SET, underrun,      set) |
		IO_STATE(R_IRQ_MASK0_SET, excessive_col, set);

	/* make sure the irqs are cleared */

	*R_DMA_CH0_CLR_INTR = IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do);
	*R_DMA_CH1_CLR_INTR = IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do);

	/* make sure the rec and transmit error counters are cleared */

	(void)*R_REC_COUNTERS;  /* dummy read */
	(void)*R_TR_COUNTERS;   /* dummy read */

	/* start the receiving DMA channel so we can receive packets from now on */

	*R_DMA_CH1_FIRST = virt_to_phys(myNextRxDesc);
	*R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, start);

	/* Set up transmit DMA channel so it can be restarted later */

	*R_DMA_CH0_FIRST = 0;
	*R_DMA_CH0_DESCR = virt_to_phys(myLastTxDesc);
	netif_start_queue(dev);

	local_irq_restore(flags);

	/* Probe for transceiver */
	if (e100_probe_transceiver(dev))
		goto grace_exit5;

	/* Start duplex/speed timers */
	add_timer(&speed_timer);
	add_timer(&duplex_timer);

	/* We are now ready to accept transmit requeusts from
	 * the queueing layer of the networking.
	 */
	netif_carrier_on(dev);

	return 0;

grace_exit5:
	cris_free_dma(NETWORK_RX_DMA_NBR, cardname);
grace_exit4:
	cris_free_dma(NETWORK_TX_DMA_NBR, cardname);
grace_exit3:
	free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);
grace_exit2:
	free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
grace_exit1:
	free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
grace_exit0:
	return -EAGAIN;
}

#if defined(CONFIG_ETRAX_NO_PHY)
static void
dummy_check_speed(struct net_device* dev)
{
	current_speed = 100;
}
#else
static void
generic_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE);
	if ((data & ADVERTISE_100FULL) ||
	    (data & ADVERTISE_100HALF))
		current_speed = 100;
	else
		current_speed = 10;
}

static void
tdk_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_TDK_DIAGNOSTIC_REG);
	current_speed = (data & MDIO_TDK_DIAGNOSTIC_RATE ? 100 : 10);
}

static void
broadcom_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_AUX_CTRL_STATUS_REG);
	current_speed = (data & MDIO_BC_SPEED ? 100 : 10);
}

static void
intel_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_INT_STATUS_REG_2);
	current_speed = (data & MDIO_INT_SPEED ? 100 : 10);
}
#endif
static void
e100_check_speed(unsigned long priv)
{
	struct net_device* dev = (struct net_device*)priv;
	struct net_local *np = netdev_priv(dev);
	static int led_initiated = 0;
	unsigned long data;
	int old_speed = current_speed;

	spin_lock(&np->transceiver_lock);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMSR);
	if (!(data & BMSR_LSTATUS)) {
		current_speed = 0;
	} else {
		transceiver->check_speed(dev);
	}

	spin_lock(&np->led_lock);
	if ((old_speed != current_speed) || !led_initiated) {
		led_initiated = 1;
		e100_set_network_leds(NO_NETWORK_ACTIVITY);
		if (current_speed)
			netif_carrier_on(dev);
		else
			netif_carrier_off(dev);
	}
	spin_unlock(&np->led_lock);

	/* Reinitialize the timer. */
	speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;
	add_timer(&speed_timer);

	spin_unlock(&np->transceiver_lock);
}

static void
e100_negotiate(struct net_device* dev)
{
	struct net_local *np = netdev_priv(dev);
	unsigned short data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
						MII_ADVERTISE);

	/* Discard old speed and duplex settings */
	data &= ~(ADVERTISE_100HALF | ADVERTISE_100FULL |
	          ADVERTISE_10HALF | ADVERTISE_10FULL);

	switch (current_speed_selection) {
		case 10:
			if (current_duplex == full)
				data |= ADVERTISE_10FULL;
			else if (current_duplex == half)
				data |= ADVERTISE_10HALF;
			else
				data |= ADVERTISE_10HALF | ADVERTISE_10FULL;
			break;

		case 100:
			 if (current_duplex == full)
				data |= ADVERTISE_100FULL;
			else if (current_duplex == half)
				data |= ADVERTISE_100HALF;
			else
				data |= ADVERTISE_100HALF | ADVERTISE_100FULL;
			break;

		case 0: /* Auto */
			 if (current_duplex == full)
				data |= ADVERTISE_100FULL | ADVERTISE_10FULL;
			else if (current_duplex == half)
				data |= ADVERTISE_100HALF | ADVERTISE_10HALF;
			else
				data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
				  ADVERTISE_100HALF | ADVERTISE_100FULL;
			break;

		default: /* assume autoneg speed and duplex */
			data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
				  ADVERTISE_100HALF | ADVERTISE_100FULL;
			break;
	}

	e100_set_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE, data);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR);
	if (autoneg_normal) {
		/* Renegotiate with link partner */
		data |= BMCR_ANENABLE | BMCR_ANRESTART;
	} else {
		/* Don't negotiate speed or duplex */
		data &= ~(BMCR_ANENABLE | BMCR_ANRESTART);

		/* Set speed and duplex static */
		if (current_speed_selection == 10)
			data &= ~BMCR_SPEED100;
		else
			data |= BMCR_SPEED100;

		if (current_duplex != full)
			data &= ~BMCR_FULLDPLX;
		else
			data |= BMCR_FULLDPLX;
	}
	e100_set_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR, data);
}

static void
e100_set_speed(struct net_device* dev, unsigned long speed)
{
	struct net_local *np = netdev_priv(dev);

	spin_lock(&np->transceiver_lock);
	if (speed != current_speed_selection) {
		current_speed_selection = speed;
		e100_negotiate(dev);
	}
	spin_unlock(&np->transceiver_lock);
}

static void
e100_check_duplex(unsigned long priv)
{
	struct net_device *dev = (struct net_device *)priv;
	struct net_local *np = netdev_priv(dev);
	int old_duplex;

	spin_lock(&np->transceiver_lock);
	old_duplex = full_duplex;
	transceiver->check_duplex(dev);
	if (old_duplex != full_duplex) {
		/* Duplex changed */
		SETF(network_rec_config_shadow, R_NETWORK_REC_CONFIG, duplex, full_duplex);
		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
	}

	/* Reinitialize the timer. */
	duplex_timer.expires = jiffies + NET_DUPLEX_CHECK_INTERVAL;
	add_timer(&duplex_timer);
	np->mii_if.full_duplex = full_duplex;
	spin_unlock(&np->transceiver_lock);
}
#if defined(CONFIG_ETRAX_NO_PHY)
static void
dummy_check_duplex(struct net_device* dev)
{
	full_duplex = 1;
}
#else
static void
generic_check_duplex(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE);
	if ((data & ADVERTISE_10FULL) ||
	    (data & ADVERTISE_100FULL))
		full_duplex = 1;
	else
		full_duplex = 0;
}

static void
tdk_check_duplex(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_TDK_DIAGNOSTIC_REG);
	full_duplex = (data & MDIO_TDK_DIAGNOSTIC_DPLX) ? 1 : 0;
}

static void
broadcom_check_duplex(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_AUX_CTRL_STATUS_REG);
	full_duplex = (data & MDIO_BC_FULL_DUPLEX_IND) ? 1 : 0;
}

static void
intel_check_duplex(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_INT_STATUS_REG_2);
	full_duplex = (data & MDIO_INT_FULL_DUPLEX_IND) ? 1 : 0;
}
#endif
static void
e100_set_duplex(struct net_device* dev, enum duplex new_duplex)
{
	struct net_local *np = netdev_priv(dev);

	spin_lock(&np->transceiver_lock);
	if (new_duplex != current_duplex) {
		current_duplex = new_duplex;
		e100_negotiate(dev);
	}
	spin_unlock(&np->transceiver_lock);
}

static int
e100_probe_transceiver(struct net_device* dev)
{
	int ret = 0;

#if !defined(CONFIG_ETRAX_NO_PHY)
	unsigned int phyid_high;
	unsigned int phyid_low;
	unsigned int oui;
	struct transceiver_ops* ops = NULL;
	struct net_local *np = netdev_priv(dev);

	spin_lock(&np->transceiver_lock);

	/* Probe MDIO physical address */
	for (np->mii_if.phy_id = 0; np->mii_if.phy_id <= 31;
	     np->mii_if.phy_id++) {
		if (e100_get_mdio_reg(dev,
				      np->mii_if.phy_id, MII_BMSR) != 0xffff)
			break;
	}
	if (np->mii_if.phy_id == 32) {
		ret = -ENODEV;
		goto out;
	}

	/* Get manufacturer */
	phyid_high = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_PHYSID1);
	phyid_low = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_PHYSID2);
	oui = (phyid_high << 6) | (phyid_low >> 10);

	for (ops = &transceivers[0]; ops->oui; ops++) {
		if (ops->oui == oui)
			break;
	}
	transceiver = ops;
out:
	spin_unlock(&np->transceiver_lock);
#endif
	return ret;
}

static int
e100_get_mdio_reg(struct net_device *dev, int phy_id, int location)
{
	unsigned short cmd;    /* Data to be sent on MDIO port */
	int data;   /* Data read from MDIO */
	int bitCounter;

	/* Start of frame, OP Code, Physical Address, Register Address */
	cmd = (MDIO_START << 14) | (MDIO_READ << 12) | (phy_id << 7) |
		(location << 2);

	e100_send_mdio_cmd(cmd, 0);

	data = 0;

	/* Data... */
	for (bitCounter=15; bitCounter>=0 ; bitCounter--) {
		data |= (e100_receive_mdio_bit() << bitCounter);
	}

	return data;
}

static void
e100_set_mdio_reg(struct net_device *dev, int phy_id, int location, int value)
{
	int bitCounter;
	unsigned short cmd;

	cmd = (MDIO_START << 14) | (MDIO_WRITE << 12) | (phy_id << 7) |
	      (location << 2);

	e100_send_mdio_cmd(cmd, 1);

	/* Data... */
	for (bitCounter=15; bitCounter>=0 ; bitCounter--) {
		e100_send_mdio_bit(GET_BIT(bitCounter, value));
	}

}

static void
e100_send_mdio_cmd(unsigned short cmd, int write_cmd)
{
	int bitCounter;
	unsigned char data = 0x2;

	/* Preamble */
	for (bitCounter = 31; bitCounter>= 0; bitCounter--)
		e100_send_mdio_bit(GET_BIT(bitCounter, MDIO_PREAMBLE));

	for (bitCounter = 15; bitCounter >= 2; bitCounter--)
		e100_send_mdio_bit(GET_BIT(bitCounter, cmd));

	/* Turnaround */
	for (bitCounter = 1; bitCounter >= 0 ; bitCounter--)
		if (write_cmd)
			e100_send_mdio_bit(GET_BIT(bitCounter, data));
		else
			e100_receive_mdio_bit();
}

static void
e100_send_mdio_bit(unsigned char bit)
{
	*R_NETWORK_MGM_CTRL =
		IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable) |
		IO_FIELD(R_NETWORK_MGM_CTRL, mdio, bit);
	udelay(1);
	*R_NETWORK_MGM_CTRL =
		IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable) |
		IO_MASK(R_NETWORK_MGM_CTRL, mdck) |
		IO_FIELD(R_NETWORK_MGM_CTRL, mdio, bit);
	udelay(1);
}

static unsigned char
e100_receive_mdio_bit()
{
	unsigned char bit;
	*R_NETWORK_MGM_CTRL = 0;
	bit = IO_EXTRACT(R_NETWORK_STAT, mdio, *R_NETWORK_STAT);
	udelay(1);
	*R_NETWORK_MGM_CTRL = IO_MASK(R_NETWORK_MGM_CTRL, mdck);
	udelay(1);
	return bit;
}

static void
e100_reset_transceiver(struct net_device* dev)
{
	struct net_local *np = netdev_priv(dev);
	unsigned short cmd;
	unsigned short data;
	int bitCounter;

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMCR);

	cmd = (MDIO_START << 14) | (MDIO_WRITE << 12) | (np->mii_if.phy_id << 7) | (MII_BMCR << 2);

	e100_send_mdio_cmd(cmd, 1);

	data |= 0x8000;

	for (bitCounter = 15; bitCounter >= 0 ; bitCounter--) {
		e100_send_mdio_bit(GET_BIT(bitCounter, data));
	}
}

/* Called by upper layers if they decide it took too long to complete
 * sending a packet - we need to reset and stuff.
 */

static void
e100_tx_timeout(struct net_device *dev)
{
	struct net_local *np = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&np->lock, flags);

	printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
	       tx_done(dev) ? "IRQ problem" : "network cable problem");

	/* remember we got an error */

	np->stats.tx_errors++;

	/* reset the TX DMA in case it has hung on something */

	RESET_DMA(NETWORK_TX_DMA_NBR);
	WAIT_DMA(NETWORK_TX_DMA_NBR);

	/* Reset the transceiver. */

	e100_reset_transceiver(dev);

	/* and get rid of the packets that never got an interrupt */
	while (myFirstTxDesc != myNextTxDesc) {
		dev_kfree_skb(myFirstTxDesc->skb);
		myFirstTxDesc->skb = 0;
		myFirstTxDesc = phys_to_virt(myFirstTxDesc->descr.next);
	}

	/* Set up transmit DMA channel so it can be restarted later */
	*R_DMA_CH0_FIRST = 0;
	*R_DMA_CH0_DESCR = virt_to_phys(myLastTxDesc);

	/* tell the upper layers we're ok again */

	netif_wake_queue(dev);
	spin_unlock_irqrestore(&np->lock, flags);
}


/* This will only be invoked if the driver is _not_ in XOFF state.
 * What this means is that we need not check it, and that this
 * invariant will hold if we make sure that the netif_*_queue()
 * calls are done at the proper times.
 */

static int
e100_send_packet(struct sk_buff *skb, struct net_device *dev)
{
	struct net_local *np = netdev_priv(dev);
	unsigned char *buf = skb->data;
	unsigned long flags;

#ifdef ETHDEBUG
	printk("send packet len %d\n", length);
#endif
	spin_lock_irqsave(&np->lock, flags);  /* protect from tx_interrupt and ourself */

	myNextTxDesc->skb = skb;

	dev->trans_start = jiffies;

	e100_hardware_send_packet(np, buf, skb->len);

	myNextTxDesc = phys_to_virt(myNextTxDesc->descr.next);

	/* Stop queue if full */
	if (myNextTxDesc == myFirstTxDesc) {
		netif_stop_queue(dev);
	}

	spin_unlock_irqrestore(&np->lock, flags);

	return NETDEV_TX_OK;
}

/*
 * The typical workload of the driver:
 *   Handle the network interface interrupts.
 */

static irqreturn_t
e100rxtx_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct net_local *np = netdev_priv(dev);
	unsigned long irqbits;

	/*
	 * Note that both rx and tx interrupts are blocked at this point,
	 * regardless of which got us here.
	 */

	irqbits = *R_IRQ_MASK2_RD;

	/* Handle received packets */
	if (irqbits & IO_STATE(R_IRQ_MASK2_RD, dma1_eop, active)) {
		/* acknowledge the eop interrupt */

		*R_DMA_CH1_CLR_INTR = IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do);

		/* check if one or more complete packets were indeed received */

		while ((*R_DMA_CH1_FIRST != virt_to_phys(myNextRxDesc)) &&
		       (myNextRxDesc != myLastRxDesc)) {
			/* Take out the buffer and give it to the OS, then
			 * allocate a new buffer to put a packet in.
			 */
			e100_rx(dev);
			np->stats.rx_packets++;
			/* restart/continue on the channel, for safety */
			*R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, restart);
			/* clear dma channel 1 eop/descr irq bits */
			*R_DMA_CH1_CLR_INTR =
				IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do) |
				IO_STATE(R_DMA_CH1_CLR_INTR, clr_descr, do);

			/* now, we might have gotten another packet
			   so we have to loop back and check if so */
		}
	}

	/* Report any packets that have been sent */
	while (virt_to_phys(myFirstTxDesc) != *R_DMA_CH0_FIRST &&
	       (netif_queue_stopped(dev) || myFirstTxDesc != myNextTxDesc)) {
		np->stats.tx_bytes += myFirstTxDesc->skb->len;
		np->stats.tx_packets++;

		/* dma is ready with the transmission of the data in tx_skb, so now
		   we can release the skb memory */
		dev_kfree_skb_irq(myFirstTxDesc->skb);
		myFirstTxDesc->skb = 0;
		myFirstTxDesc = phys_to_virt(myFirstTxDesc->descr.next);
                /* Wake up queue. */
		netif_wake_queue(dev);
	}

	if (irqbits & IO_STATE(R_IRQ_MASK2_RD, dma0_eop, active)) {
		/* acknowledge the eop interrupt. */
		*R_DMA_CH0_CLR_INTR = IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do);
	}

	return IRQ_HANDLED;
}

static irqreturn_t
e100nw_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct net_local *np = netdev_priv(dev);
	unsigned long irqbits = *R_IRQ_MASK0_RD;

	/* check for underrun irq */
	if (irqbits & IO_STATE(R_IRQ_MASK0_RD, underrun, active)) {
		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
		*R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;
		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, nop);
		np->stats.tx_errors++;
		D(printk("ethernet receiver underrun!\n"));
	}

	/* check for overrun irq */
	if (irqbits & IO_STATE(R_IRQ_MASK0_RD, overrun, active)) {
		update_rx_stats(&np->stats); /* this will ack the irq */
		D(printk("ethernet receiver overrun!\n"));
	}
	/* check for excessive collision irq */
	if (irqbits & IO_STATE(R_IRQ_MASK0_RD, excessive_col, active)) {
		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
		*R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;
		SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, nop);
		np->stats.tx_errors++;
		D(printk("ethernet excessive collisions!\n"));
	}
	return IRQ_HANDLED;
}

/* We have a good packet(s), get it/them out of the buffers. */
static void
e100_rx(struct net_device *dev)
{
	struct sk_buff *skb;
	int length = 0;
	struct net_local *np = netdev_priv(dev);
	unsigned char *skb_data_ptr;
#ifdef ETHDEBUG
	int i;
#endif
	etrax_eth_descr *prevRxDesc;  /* The descriptor right before myNextRxDesc */
	spin_lock(&np->led_lock);
	if (!led_active && time_after(jiffies, led_next_time)) {
		/* light the network leds depending on the current speed. */
		e100_set_network_leds(NETWORK_ACTIVITY);

		/* Set the earliest time we may clear the LED */
		led_next_time = jiffies + NET_FLASH_TIME;
		led_active = 1;
		mod_timer(&clear_led_timer, jiffies + HZ/10);
	}
	spin_unlock(&np->led_lock);

	length = myNextRxDesc->descr.hw_len - 4;
	np->stats.rx_bytes += length;

#ifdef ETHDEBUG
	printk("Got a packet of length %d:\n", length);
	/* dump the first bytes in the packet */
	skb_data_ptr = (unsigned char *)phys_to_virt(myNextRxDesc->descr.buf);
	for (i = 0; i < 8; i++) {
		printk("%d: %.2x %.2x %.2x %.2x %.2x %.2x %.2x %.2x\n", i * 8,
		       skb_data_ptr[0],skb_data_ptr[1],skb_data_ptr[2],skb_data_ptr[3],
		       skb_data_ptr[4],skb_data_ptr[5],skb_data_ptr[6],skb_data_ptr[7]);
		skb_data_ptr += 8;
	}
#endif

	if (length < RX_COPYBREAK) {
		/* Small packet, copy data */
		skb = dev_alloc_skb(length - ETHER_HEAD_LEN);
		if (!skb) {
			np->stats.rx_errors++;
			printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
			goto update_nextrxdesc;
		}

		skb_put(skb, length - ETHER_HEAD_LEN);        /* allocate room for the packet body */
		skb_data_ptr = skb_push(skb, ETHER_HEAD_LEN); /* allocate room for the header */

#ifdef ETHDEBUG
		printk("head = 0x%x, data = 0x%x, tail = 0x%x, end = 0x%x\n",
		       skb->head, skb->data, skb_tail_pointer(skb),
		       skb_end_pointer(skb));
		printk("copying packet to 0x%x.\n", skb_data_ptr);
#endif

		memcpy(skb_data_ptr, phys_to_virt(myNextRxDesc->descr.buf), length);
	}
	else {
		/* Large packet, send directly to upper layers and allocate new
		 * memory (aligned to cache line boundary to avoid bug).
		 * Before sending the skb to upper layers we must make sure
		 * that skb->data points to the aligned start of the packet.
		 */
		int align;
		struct sk_buff *new_skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);
		if (!new_skb) {
			np->stats.rx_errors++;
			printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
			goto update_nextrxdesc;
		}
		skb = myNextRxDesc->skb;
		align = (int)phys_to_virt(myNextRxDesc->descr.buf) - (int)skb->data;
		skb_put(skb, length + align);
		skb_pull(skb, align); /* Remove alignment bytes */
		myNextRxDesc->skb = new_skb;
		myNextRxDesc->descr.buf = L1_CACHE_ALIGN(virt_to_phys(myNextRxDesc->skb->data));
	}

	skb->protocol = eth_type_trans(skb, dev);

	/* Send the packet to the upper layers */
	netif_rx(skb);

  update_nextrxdesc:
	/* Prepare for next packet */
	myNextRxDesc->descr.status = 0;
	prevRxDesc = myNextRxDesc;
	myNextRxDesc = phys_to_virt(myNextRxDesc->descr.next);

	rx_queue_len++;

	/* Check if descriptors should be returned */
	if (rx_queue_len == RX_QUEUE_THRESHOLD) {
		flush_etrax_cache();
		prevRxDesc->descr.ctrl |= d_eol;
		myLastRxDesc->descr.ctrl &= ~d_eol;
		myLastRxDesc = prevRxDesc;
		rx_queue_len = 0;
	}
}

/* The inverse routine to net_open(). */
static int
e100_close(struct net_device *dev)
{
	struct net_local *np = netdev_priv(dev);

	printk(KERN_INFO "Closing %s.\n", dev->name);

	netif_stop_queue(dev);

	*R_IRQ_MASK0_CLR =
		IO_STATE(R_IRQ_MASK0_CLR, overrun, clr) |
		IO_STATE(R_IRQ_MASK0_CLR, underrun, clr) |
		IO_STATE(R_IRQ_MASK0_CLR, excessive_col, clr);

	*R_IRQ_MASK2_CLR =
		IO_STATE(R_IRQ_MASK2_CLR, dma0_descr, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma0_eop, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma1_descr, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma1_eop, clr);

	/* Stop the receiver and the transmitter */

	RESET_DMA(NETWORK_TX_DMA_NBR);
	RESET_DMA(NETWORK_RX_DMA_NBR);

	/* Flush the Tx and disable Rx here. */

	free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
	free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
	free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);

	cris_free_dma(NETWORK_TX_DMA_NBR, cardname);
	cris_free_dma(NETWORK_RX_DMA_NBR, cardname);

	/* Update the statistics here. */

	update_rx_stats(&np->stats);
	update_tx_stats(&np->stats);

	/* Stop speed/duplex timers */
	del_timer(&speed_timer);
	del_timer(&duplex_timer);

	return 0;
}

static int
e100_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct mii_ioctl_data *data = if_mii(ifr);
	struct net_local *np = netdev_priv(dev);
	int rc = 0;
        int old_autoneg;

	spin_lock(&np->lock); /* Preempt protection */
	switch (cmd) {
		/* The ioctls below should be considered obsolete but are */
		/* still present for compatability with old scripts/apps  */
		case SET_ETH_SPEED_10:                  /* 10 Mbps */
			e100_set_speed(dev, 10);
			break;
		case SET_ETH_SPEED_100:                /* 100 Mbps */
			e100_set_speed(dev, 100);
			break;
		case SET_ETH_SPEED_AUTO:        /* Auto-negotiate speed */
			e100_set_speed(dev, 0);
			break;
		case SET_ETH_DUPLEX_HALF:       /* Half duplex */
			e100_set_duplex(dev, half);
			break;
		case SET_ETH_DUPLEX_FULL:       /* Full duplex */
			e100_set_duplex(dev, full);
			break;
		case SET_ETH_DUPLEX_AUTO:       /* Auto-negotiate duplex */
			e100_set_duplex(dev, autoneg);
			break;
	        case SET_ETH_AUTONEG:
			old_autoneg = autoneg_normal;
		        autoneg_normal = *(int*)data;
			if (autoneg_normal != old_autoneg)
				e100_negotiate(dev);
			break;
		default:
			rc = generic_mii_ioctl(&np->mii_if, if_mii(ifr),
						cmd, NULL);
			break;
	}
	spin_unlock(&np->lock);
	return rc;
}

static int e100_get_settings(struct net_device *dev,
			     struct ethtool_cmd *cmd)
{
	struct net_local *np = netdev_priv(dev);
	int err;

	spin_lock_irq(&np->lock);
	err = mii_ethtool_gset(&np->mii_if, cmd);
	spin_unlock_irq(&np->lock);

	/* The PHY may support 1000baseT, but the Etrax100 does not.  */
	cmd->supported &= ~(SUPPORTED_1000baseT_Half
			    | SUPPORTED_1000baseT_Full);
	return err;
}

static int e100_set_settings(struct net_device *dev,
			     struct ethtool_cmd *ecmd)
{
	if (ecmd->autoneg == AUTONEG_ENABLE) {
		e100_set_duplex(dev, autoneg);
		e100_set_speed(dev, 0);
	} else {
		e100_set_duplex(dev, ecmd->duplex == DUPLEX_HALF ? half : full);
		e100_set_speed(dev, ecmd->speed == SPEED_10 ? 10: 100);
	}

	return 0;
}

static void e100_get_drvinfo(struct net_device *dev,
			     struct ethtool_drvinfo *info)
{
	strncpy(info->driver, "ETRAX 100LX", sizeof(info->driver) - 1);
	strncpy(info->version, "$Revision: 1.31 $", sizeof(info->version) - 1);
	strncpy(info->fw_version, "N/A", sizeof(info->fw_version) - 1);
	strncpy(info->bus_info, "N/A", sizeof(info->bus_info) - 1);
}

static int e100_nway_reset(struct net_device *dev)
{
	if (current_duplex == autoneg && current_speed_selection == 0)
		e100_negotiate(dev);
	return 0;
}

static const struct ethtool_ops e100_ethtool_ops = {
	.get_settings	= e100_get_settings,
	.set_settings	= e100_set_settings,
	.get_drvinfo	= e100_get_drvinfo,
	.nway_reset	= e100_nway_reset,
	.get_link	= ethtool_op_get_link,
};

static int
e100_set_config(struct net_device *dev, struct ifmap *map)
{
	struct net_local *np = netdev_priv(dev);

	spin_lock(&np->lock); /* Preempt protection */

	switch(map->port) {
		case IF_PORT_UNKNOWN:
			/* Use autoneg */
			e100_set_speed(dev, 0);
			e100_set_duplex(dev, autoneg);
			break;
		case IF_PORT_10BASET:
			e100_set_speed(dev, 10);
			e100_set_duplex(dev, autoneg);
			break;
		case IF_PORT_100BASET:
		case IF_PORT_100BASETX:
			e100_set_speed(dev, 100);
			e100_set_duplex(dev, autoneg);
			break;
		case IF_PORT_100BASEFX:
		case IF_PORT_10BASE2:
		case IF_PORT_AUI:
			spin_unlock(&np->lock);
			return -EOPNOTSUPP;
			break;
		default:
			printk(KERN_ERR "%s: Invalid media selected", dev->name);
			spin_unlock(&np->lock);
			return -EINVAL;
	}
	spin_unlock(&np->lock);
	return 0;
}

static void
update_rx_stats(struct net_device_stats *es)
{
	unsigned long r = *R_REC_COUNTERS;
	/* update stats relevant to reception errors */
	es->rx_fifo_errors += IO_EXTRACT(R_REC_COUNTERS, congestion, r);
	es->rx_crc_errors += IO_EXTRACT(R_REC_COUNTERS, crc_error, r);
	es->rx_frame_errors += IO_EXTRACT(R_REC_COUNTERS, alignment_error, r);
	es->rx_length_errors += IO_EXTRACT(R_REC_COUNTERS, oversize, r);
}

static void
update_tx_stats(struct net_device_stats *es)
{
	unsigned long r = *R_TR_COUNTERS;
	/* update stats relevant to transmission errors */
	es->collisions +=
		IO_EXTRACT(R_TR_COUNTERS, single_col, r) +
		IO_EXTRACT(R_TR_COUNTERS, multiple_col, r);
}

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *
e100_get_stats(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&lp->lock, flags);

	update_rx_stats(&lp->stats);
	update_tx_stats(&lp->stats);

	spin_unlock_irqrestore(&lp->lock, flags);
	return &lp->stats;
}

/*
 * Set or clear the multicast filter for this adaptor.
 * num_addrs == -1	Promiscuous mode, receive all packets
 * num_addrs == 0	Normal mode, clear multicast list
 * num_addrs > 0	Multicast mode, receive normal and MC packets,
 *			and do best-effort filtering.
 */
static void
set_multicast_list(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	int num_addr = dev->mc_count;
	unsigned long int lo_bits;
	unsigned long int hi_bits;

	spin_lock(&lp->lock);
	if (dev->flags & IFF_PROMISC) {
		/* promiscuous mode */
		lo_bits = 0xfffffffful;
		hi_bits = 0xfffffffful;

		/* Enable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, receive);
		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
	} else if (dev->flags & IFF_ALLMULTI) {
		/* enable all multicasts */
		lo_bits = 0xfffffffful;
		hi_bits = 0xfffffffful;

		/* Disable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
		*R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
	} else if (num_addr == 0) {
		/* Normal, clear the mc list */
		lo_bits = 0x00000000ul;
		hi_bits = 0x00000000ul;

		/* Disable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
		*R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
	} else {
		/* MC mode, receive normal and MC packets */
		char hash_ix;
		struct dev_mc_list *dmi = dev->mc_list;
		int i;
		char *baddr;

		lo_bits = 0x00000000ul;
		hi_bits = 0x00000000ul;
		for (i = 0; i < num_addr; i++) {
			/* Calculate the hash index for the GA registers */

			hash_ix = 0;
			baddr = dmi->dmi_addr;
			hash_ix ^= (*baddr) & 0x3f;
			hash_ix ^= ((*baddr) >> 6) & 0x03;
			++baddr;
			hash_ix ^= ((*baddr) << 2) & 0x03c;
			hash_ix ^= ((*baddr) >> 4) & 0xf;
			++baddr;
			hash_ix ^= ((*baddr) << 4) & 0x30;
			hash_ix ^= ((*baddr) >> 2) & 0x3f;
			++baddr;
			hash_ix ^= (*baddr) & 0x3f;
			hash_ix ^= ((*baddr) >> 6) & 0x03;
			++baddr;
			hash_ix ^= ((*baddr) << 2) & 0x03c;
			hash_ix ^= ((*baddr) >> 4) & 0xf;
			++baddr;
			hash_ix ^= ((*baddr) << 4) & 0x30;
			hash_ix ^= ((*baddr) >> 2) & 0x3f;

			hash_ix &= 0x3f;

			if (hash_ix >= 32) {
				hi_bits |= (1 << (hash_ix-32));
			} else {
				lo_bits |= (1 << hash_ix);
			}
			dmi = dmi->next;
		}
		/* Disable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
	}
	*R_NETWORK_GA_0 = lo_bits;
	*R_NETWORK_GA_1 = hi_bits;
	spin_unlock(&lp->lock);
}

void
e100_hardware_send_packet(struct net_local *np, char *buf, int length)
{
	D(printk("e100 send pack, buf 0x%x len %d\n", buf, length));

	spin_lock(&np->led_lock);
	if (!led_active && time_after(jiffies, led_next_time)) {
		/* light the network leds depending on the current speed. */
		e100_set_network_leds(NETWORK_ACTIVITY);

		/* Set the earliest time we may clear the LED */
		led_next_time = jiffies + NET_FLASH_TIME;
		led_active = 1;
		mod_timer(&clear_led_timer, jiffies + HZ/10);
	}
	spin_unlock(&np->led_lock);

	/* configure the tx dma descriptor */
	myNextTxDesc->descr.sw_len = length;
	myNextTxDesc->descr.ctrl = d_eop | d_eol | d_wait;
	myNextTxDesc->descr.buf = virt_to_phys(buf);

        /* Move end of list */
        myLastTxDesc->descr.ctrl &= ~d_eol;
        myLastTxDesc = myNextTxDesc;

	/* Restart DMA channel */
	*R_DMA_CH0_CMD = IO_STATE(R_DMA_CH0_CMD, cmd, restart);
}

static void
e100_clear_network_leds(unsigned long dummy)
{
	struct net_device *dev = (struct net_device *)dummy;
	struct net_local *np = netdev_priv(dev);

	spin_lock(&np->led_lock);

	if (led_active && time_after(jiffies, led_next_time)) {
		e100_set_network_leds(NO_NETWORK_ACTIVITY);

		/* Set the earliest time we may set the LED */
		led_next_time = jiffies + NET_FLASH_PAUSE;
		led_active = 0;
	}

	spin_unlock(&np->led_lock);
}

static void
e100_set_network_leds(int active)
{
#if defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK)
	int light_leds = (active == NO_NETWORK_ACTIVITY);
#elif defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY)
	int light_leds = (active == NETWORK_ACTIVITY);
#else
#error "Define either CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK or CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY"
#endif

	if (!current_speed) {
		/* Make LED red, link is down */
#if defined(CONFIG_ETRAX_NETWORK_RED_ON_NO_CONNECTION)
		CRIS_LED_NETWORK_SET(CRIS_LED_RED);
#else
		CRIS_LED_NETWORK_SET(CRIS_LED_OFF);
#endif
	} else if (light_leds) {
		if (current_speed == 10) {
			CRIS_LED_NETWORK_SET(CRIS_LED_ORANGE);
		} else {
			CRIS_LED_NETWORK_SET(CRIS_LED_GREEN);
		}
	} else {
		CRIS_LED_NETWORK_SET(CRIS_LED_OFF);
	}
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void
e100_netpoll(struct net_device* netdev)
{
	e100rxtx_interrupt(NETWORK_DMA_TX_IRQ_NBR, netdev, NULL);
}
#endif

static int
etrax_init_module(void)
{
	return etrax_ethernet_init();
}

static int __init
e100_boot_setup(char* str)
{
	struct sockaddr sa = {0};
	int i;

	/* Parse the colon separated Ethernet station address */
	for (i = 0; i <  ETH_ALEN; i++) {
		unsigned int tmp;
		if (sscanf(str + 3*i, "%2x", &tmp) != 1) {
			printk(KERN_WARNING "Malformed station address");
			return 0;
		}
		sa.sa_data[i] = (char)tmp;
	}

	default_mac = sa;
	return 1;
}

__setup("etrax100_eth=", e100_boot_setup);

module_init(etrax_init_module);
OpenPOWER on IntegriCloud