aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/smsc9420.c
blob: 940220f6092135561ab222ac40270fd53e4dc61e (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
 /***************************************************************************
 *
 * Copyright (C) 2007,2008  SMSC
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 ***************************************************************************
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/pci.h>
#include <linux/if_vlan.h>
#include <linux/dma-mapping.h>
#include <linux/crc32.h>
#include <asm/unaligned.h>
#include "smsc9420.h"

#define DRV_NAME		"smsc9420"
#define PFX			DRV_NAME ": "
#define DRV_MDIONAME		"smsc9420-mdio"
#define DRV_DESCRIPTION		"SMSC LAN9420 driver"
#define DRV_VERSION		"1.01"

MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

struct smsc9420_dma_desc {
	u32 status;
	u32 length;
	u32 buffer1;
	u32 buffer2;
};

struct smsc9420_ring_info {
	struct sk_buff *skb;
	dma_addr_t mapping;
};

struct smsc9420_pdata {
	void __iomem *base_addr;
	struct pci_dev *pdev;
	struct net_device *dev;

	struct smsc9420_dma_desc *rx_ring;
	struct smsc9420_dma_desc *tx_ring;
	struct smsc9420_ring_info *tx_buffers;
	struct smsc9420_ring_info *rx_buffers;
	dma_addr_t rx_dma_addr;
	dma_addr_t tx_dma_addr;
	int tx_ring_head, tx_ring_tail;
	int rx_ring_head, rx_ring_tail;

	spinlock_t int_lock;
	spinlock_t phy_lock;

	struct napi_struct napi;

	bool software_irq_signal;
	bool rx_csum;
	u32 msg_enable;

	struct phy_device *phy_dev;
	struct mii_bus *mii_bus;
	int phy_irq[PHY_MAX_ADDR];
	int last_duplex;
	int last_carrier;
};

static const struct pci_device_id smsc9420_id_table[] = {
	{ PCI_VENDOR_ID_9420, PCI_DEVICE_ID_9420, PCI_ANY_ID, PCI_ANY_ID, },
	{ 0, }
};

MODULE_DEVICE_TABLE(pci, smsc9420_id_table);

#define SMSC_MSG_DEFAULT (NETIF_MSG_DRV | NETIF_MSG_PROBE | NETIF_MSG_LINK)

static uint smsc_debug;
static uint debug = -1;
module_param(debug, uint, 0);
MODULE_PARM_DESC(debug, "debug level");

#define smsc_dbg(TYPE, f, a...) \
do {	if ((pd)->msg_enable & NETIF_MSG_##TYPE) \
		printk(KERN_DEBUG PFX f "\n", ## a); \
} while (0)

#define smsc_info(TYPE, f, a...) \
do {	if ((pd)->msg_enable & NETIF_MSG_##TYPE) \
		printk(KERN_INFO PFX f "\n", ## a); \
} while (0)

#define smsc_warn(TYPE, f, a...) \
do {	if ((pd)->msg_enable & NETIF_MSG_##TYPE) \
		printk(KERN_WARNING PFX f "\n", ## a); \
} while (0)

static inline u32 smsc9420_reg_read(struct smsc9420_pdata *pd, u32 offset)
{
	return ioread32(pd->base_addr + offset);
}

static inline void
smsc9420_reg_write(struct smsc9420_pdata *pd, u32 offset, u32 value)
{
	iowrite32(value, pd->base_addr + offset);
}

static inline void smsc9420_pci_flush_write(struct smsc9420_pdata *pd)
{
	/* to ensure PCI write completion, we must perform a PCI read */
	smsc9420_reg_read(pd, ID_REV);
}

static int smsc9420_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
{
	struct smsc9420_pdata *pd = (struct smsc9420_pdata *)bus->priv;
	unsigned long flags;
	u32 addr;
	int i, reg = -EIO;

	spin_lock_irqsave(&pd->phy_lock, flags);

	/*  confirm MII not busy */
	if ((smsc9420_reg_read(pd, MII_ACCESS) & MII_ACCESS_MII_BUSY_)) {
		smsc_warn(DRV, "MII is busy???");
		goto out;
	}

	/* set the address, index & direction (read from PHY) */
	addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
		MII_ACCESS_MII_READ_;
	smsc9420_reg_write(pd, MII_ACCESS, addr);

	/* wait for read to complete with 50us timeout */
	for (i = 0; i < 5; i++) {
		if (!(smsc9420_reg_read(pd, MII_ACCESS) &
			MII_ACCESS_MII_BUSY_)) {
			reg = (u16)smsc9420_reg_read(pd, MII_DATA);
			goto out;
		}
		udelay(10);
	}

	smsc_warn(DRV, "MII busy timeout!");

out:
	spin_unlock_irqrestore(&pd->phy_lock, flags);
	return reg;
}

static int smsc9420_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
			   u16 val)
{
	struct smsc9420_pdata *pd = (struct smsc9420_pdata *)bus->priv;
	unsigned long flags;
	u32 addr;
	int i, reg = -EIO;

	spin_lock_irqsave(&pd->phy_lock, flags);

	/* confirm MII not busy */
	if ((smsc9420_reg_read(pd, MII_ACCESS) & MII_ACCESS_MII_BUSY_)) {
		smsc_warn(DRV, "MII is busy???");
		goto out;
	}

	/* put the data to write in the MAC */
	smsc9420_reg_write(pd, MII_DATA, (u32)val);

	/* set the address, index & direction (write to PHY) */
	addr = ((phyaddr & 0x1F) << 11) | ((regidx & 0x1F) << 6) |
		MII_ACCESS_MII_WRITE_;
	smsc9420_reg_write(pd, MII_ACCESS, addr);

	/* wait for write to complete with 50us timeout */
	for (i = 0; i < 5; i++) {
		if (!(smsc9420_reg_read(pd, MII_ACCESS) &
			MII_ACCESS_MII_BUSY_)) {
			reg = 0;
			goto out;
		}
		udelay(10);
	}

	smsc_warn(DRV, "MII busy timeout!");

out:
	spin_unlock_irqrestore(&pd->phy_lock, flags);
	return reg;
}

/* Returns hash bit number for given MAC address
 * Example:
 * 01 00 5E 00 00 01 -> returns bit number 31 */
static u32 smsc9420_hash(u8 addr[ETH_ALEN])
{
	return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
}

static int smsc9420_eeprom_reload(struct smsc9420_pdata *pd)
{
	int timeout = 100000;

	BUG_ON(!pd);

	if (smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
		smsc_dbg(DRV, "smsc9420_eeprom_reload: Eeprom busy");
		return -EIO;
	}

	smsc9420_reg_write(pd, E2P_CMD,
		(E2P_CMD_EPC_BUSY_ | E2P_CMD_EPC_CMD_RELOAD_));

	do {
		udelay(10);
		if (!(smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_))
			return 0;
	} while (timeout--);

	smsc_warn(DRV, "smsc9420_eeprom_reload: Eeprom timed out");
	return -EIO;
}

/* Standard ioctls for mii-tool */
static int smsc9420_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);

	if (!netif_running(dev) || !pd->phy_dev)
		return -EINVAL;

	return phy_mii_ioctl(pd->phy_dev, if_mii(ifr), cmd);
}

static int smsc9420_ethtool_get_settings(struct net_device *dev,
					 struct ethtool_cmd *cmd)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);

	cmd->maxtxpkt = 1;
	cmd->maxrxpkt = 1;
	return phy_ethtool_gset(pd->phy_dev, cmd);
}

static int smsc9420_ethtool_set_settings(struct net_device *dev,
					 struct ethtool_cmd *cmd)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);

	return phy_ethtool_sset(pd->phy_dev, cmd);
}

static void smsc9420_ethtool_get_drvinfo(struct net_device *netdev,
					 struct ethtool_drvinfo *drvinfo)
{
	struct smsc9420_pdata *pd = netdev_priv(netdev);

	strcpy(drvinfo->driver, DRV_NAME);
	strcpy(drvinfo->bus_info, pci_name(pd->pdev));
	strcpy(drvinfo->version, DRV_VERSION);
}

static u32 smsc9420_ethtool_get_msglevel(struct net_device *netdev)
{
	struct smsc9420_pdata *pd = netdev_priv(netdev);
	return pd->msg_enable;
}

static void smsc9420_ethtool_set_msglevel(struct net_device *netdev, u32 data)
{
	struct smsc9420_pdata *pd = netdev_priv(netdev);
	pd->msg_enable = data;
}

static int smsc9420_ethtool_nway_reset(struct net_device *netdev)
{
	struct smsc9420_pdata *pd = netdev_priv(netdev);
	return phy_start_aneg(pd->phy_dev);
}

static int smsc9420_ethtool_getregslen(struct net_device *dev)
{
	/* all smsc9420 registers plus all phy registers */
	return 0x100 + (32 * sizeof(u32));
}

static void
smsc9420_ethtool_getregs(struct net_device *dev, struct ethtool_regs *regs,
			 void *buf)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	struct phy_device *phy_dev = pd->phy_dev;
	unsigned int i, j = 0;
	u32 *data = buf;

	regs->version = smsc9420_reg_read(pd, ID_REV);
	for (i = 0; i < 0x100; i += (sizeof(u32)))
		data[j++] = smsc9420_reg_read(pd, i);

	for (i = 0; i <= 31; i++)
		data[j++] = smsc9420_mii_read(phy_dev->bus, phy_dev->addr, i);
}

static void smsc9420_eeprom_enable_access(struct smsc9420_pdata *pd)
{
	unsigned int temp = smsc9420_reg_read(pd, GPIO_CFG);
	temp &= ~GPIO_CFG_EEPR_EN_;
	smsc9420_reg_write(pd, GPIO_CFG, temp);
	msleep(1);
}

static int smsc9420_eeprom_send_cmd(struct smsc9420_pdata *pd, u32 op)
{
	int timeout = 100;
	u32 e2cmd;

	smsc_dbg(HW, "op 0x%08x", op);
	if (smsc9420_reg_read(pd, E2P_CMD) & E2P_CMD_EPC_BUSY_) {
		smsc_warn(HW, "Busy at start");
		return -EBUSY;
	}

	e2cmd = op | E2P_CMD_EPC_BUSY_;
	smsc9420_reg_write(pd, E2P_CMD, e2cmd);

	do {
		msleep(1);
		e2cmd = smsc9420_reg_read(pd, E2P_CMD);
	} while ((e2cmd & E2P_CMD_EPC_BUSY_) && (timeout--));

	if (!timeout) {
		smsc_info(HW, "TIMED OUT");
		return -EAGAIN;
	}

	if (e2cmd & E2P_CMD_EPC_TIMEOUT_) {
		smsc_info(HW, "Error occured during eeprom operation");
		return -EINVAL;
	}

	return 0;
}

static int smsc9420_eeprom_read_location(struct smsc9420_pdata *pd,
					 u8 address, u8 *data)
{
	u32 op = E2P_CMD_EPC_CMD_READ_ | address;
	int ret;

	smsc_dbg(HW, "address 0x%x", address);
	ret = smsc9420_eeprom_send_cmd(pd, op);

	if (!ret)
		data[address] = smsc9420_reg_read(pd, E2P_DATA);

	return ret;
}

static int smsc9420_eeprom_write_location(struct smsc9420_pdata *pd,
					  u8 address, u8 data)
{
	u32 op = E2P_CMD_EPC_CMD_ERASE_ | address;
	int ret;

	smsc_dbg(HW, "address 0x%x, data 0x%x", address, data);
	ret = smsc9420_eeprom_send_cmd(pd, op);

	if (!ret) {
		op = E2P_CMD_EPC_CMD_WRITE_ | address;
		smsc9420_reg_write(pd, E2P_DATA, (u32)data);
		ret = smsc9420_eeprom_send_cmd(pd, op);
	}

	return ret;
}

static int smsc9420_ethtool_get_eeprom_len(struct net_device *dev)
{
	return SMSC9420_EEPROM_SIZE;
}

static int smsc9420_ethtool_get_eeprom(struct net_device *dev,
				       struct ethtool_eeprom *eeprom, u8 *data)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	u8 eeprom_data[SMSC9420_EEPROM_SIZE];
	int len, i;

	smsc9420_eeprom_enable_access(pd);

	len = min(eeprom->len, SMSC9420_EEPROM_SIZE);
	for (i = 0; i < len; i++) {
		int ret = smsc9420_eeprom_read_location(pd, i, eeprom_data);
		if (ret < 0) {
			eeprom->len = 0;
			return ret;
		}
	}

	memcpy(data, &eeprom_data[eeprom->offset], len);
	eeprom->len = len;
	return 0;
}

static int smsc9420_ethtool_set_eeprom(struct net_device *dev,
				       struct ethtool_eeprom *eeprom, u8 *data)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	int ret;

	smsc9420_eeprom_enable_access(pd);
	smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWEN_);
	ret = smsc9420_eeprom_write_location(pd, eeprom->offset, *data);
	smsc9420_eeprom_send_cmd(pd, E2P_CMD_EPC_CMD_EWDS_);

	/* Single byte write, according to man page */
	eeprom->len = 1;

	return ret;
}

static const struct ethtool_ops smsc9420_ethtool_ops = {
	.get_settings = smsc9420_ethtool_get_settings,
	.set_settings = smsc9420_ethtool_set_settings,
	.get_drvinfo = smsc9420_ethtool_get_drvinfo,
	.get_msglevel = smsc9420_ethtool_get_msglevel,
	.set_msglevel = smsc9420_ethtool_set_msglevel,
	.nway_reset = smsc9420_ethtool_nway_reset,
	.get_link = ethtool_op_get_link,
	.get_eeprom_len = smsc9420_ethtool_get_eeprom_len,
	.get_eeprom = smsc9420_ethtool_get_eeprom,
	.set_eeprom = smsc9420_ethtool_set_eeprom,
	.get_regs_len = smsc9420_ethtool_getregslen,
	.get_regs = smsc9420_ethtool_getregs,
};

/* Sets the device MAC address to dev_addr */
static void smsc9420_set_mac_address(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	u8 *dev_addr = dev->dev_addr;
	u32 mac_high16 = (dev_addr[5] << 8) | dev_addr[4];
	u32 mac_low32 = (dev_addr[3] << 24) | (dev_addr[2] << 16) |
	    (dev_addr[1] << 8) | dev_addr[0];

	smsc9420_reg_write(pd, ADDRH, mac_high16);
	smsc9420_reg_write(pd, ADDRL, mac_low32);
}

static void smsc9420_check_mac_address(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);

	/* Check if mac address has been specified when bringing interface up */
	if (is_valid_ether_addr(dev->dev_addr)) {
		smsc9420_set_mac_address(dev);
		smsc_dbg(PROBE, "MAC Address is specified by configuration");
	} else {
		/* Try reading mac address from device. if EEPROM is present
		 * it will already have been set */
		u32 mac_high16 = smsc9420_reg_read(pd, ADDRH);
		u32 mac_low32 = smsc9420_reg_read(pd, ADDRL);
		dev->dev_addr[0] = (u8)(mac_low32);
		dev->dev_addr[1] = (u8)(mac_low32 >> 8);
		dev->dev_addr[2] = (u8)(mac_low32 >> 16);
		dev->dev_addr[3] = (u8)(mac_low32 >> 24);
		dev->dev_addr[4] = (u8)(mac_high16);
		dev->dev_addr[5] = (u8)(mac_high16 >> 8);

		if (is_valid_ether_addr(dev->dev_addr)) {
			/* eeprom values are valid  so use them */
			smsc_dbg(PROBE, "Mac Address is read from EEPROM");
		} else {
			/* eeprom values are invalid, generate random MAC */
			random_ether_addr(dev->dev_addr);
			smsc9420_set_mac_address(dev);
			smsc_dbg(PROBE,
				"MAC Address is set to random_ether_addr");
		}
	}
}

static void smsc9420_stop_tx(struct smsc9420_pdata *pd)
{
	u32 dmac_control, mac_cr, dma_intr_ena;
	int timeOut = 1000;

	/* disable TX DMAC */
	dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
	dmac_control &= (~DMAC_CONTROL_ST_);
	smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);

	/* Wait max 10ms for transmit process to stop */
	while (timeOut--) {
		if (smsc9420_reg_read(pd, DMAC_STATUS) & DMAC_STS_TS_)
			break;
		udelay(10);
	}

	if (!timeOut)
		smsc_warn(IFDOWN, "TX DMAC failed to stop");

	/* ACK Tx DMAC stop bit */
	smsc9420_reg_write(pd, DMAC_STATUS, DMAC_STS_TXPS_);

	/* mask TX DMAC interrupts */
	dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
	dma_intr_ena &= ~(DMAC_INTR_ENA_TX_);
	smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
	smsc9420_pci_flush_write(pd);

	/* stop MAC TX */
	mac_cr = smsc9420_reg_read(pd, MAC_CR) & (~MAC_CR_TXEN_);
	smsc9420_reg_write(pd, MAC_CR, mac_cr);
	smsc9420_pci_flush_write(pd);
}

static void smsc9420_free_tx_ring(struct smsc9420_pdata *pd)
{
	int i;

	BUG_ON(!pd->tx_ring);

	if (!pd->tx_buffers)
		return;

	for (i = 0; i < TX_RING_SIZE; i++) {
		struct sk_buff *skb = pd->tx_buffers[i].skb;

		if (skb) {
			BUG_ON(!pd->tx_buffers[i].mapping);
			pci_unmap_single(pd->pdev, pd->tx_buffers[i].mapping,
					 skb->len, PCI_DMA_TODEVICE);
			dev_kfree_skb_any(skb);
		}

		pd->tx_ring[i].status = 0;
		pd->tx_ring[i].length = 0;
		pd->tx_ring[i].buffer1 = 0;
		pd->tx_ring[i].buffer2 = 0;
	}
	wmb();

	kfree(pd->tx_buffers);
	pd->tx_buffers = NULL;

	pd->tx_ring_head = 0;
	pd->tx_ring_tail = 0;
}

static void smsc9420_free_rx_ring(struct smsc9420_pdata *pd)
{
	int i;

	BUG_ON(!pd->rx_ring);

	if (!pd->rx_buffers)
		return;

	for (i = 0; i < RX_RING_SIZE; i++) {
		if (pd->rx_buffers[i].skb)
			dev_kfree_skb_any(pd->rx_buffers[i].skb);

		if (pd->rx_buffers[i].mapping)
			pci_unmap_single(pd->pdev, pd->rx_buffers[i].mapping,
				PKT_BUF_SZ, PCI_DMA_FROMDEVICE);

		pd->rx_ring[i].status = 0;
		pd->rx_ring[i].length = 0;
		pd->rx_ring[i].buffer1 = 0;
		pd->rx_ring[i].buffer2 = 0;
	}
	wmb();

	kfree(pd->rx_buffers);
	pd->rx_buffers = NULL;

	pd->rx_ring_head = 0;
	pd->rx_ring_tail = 0;
}

static void smsc9420_stop_rx(struct smsc9420_pdata *pd)
{
	int timeOut = 1000;
	u32 mac_cr, dmac_control, dma_intr_ena;

	/* mask RX DMAC interrupts */
	dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
	dma_intr_ena &= (~DMAC_INTR_ENA_RX_);
	smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
	smsc9420_pci_flush_write(pd);

	/* stop RX MAC prior to stoping DMA */
	mac_cr = smsc9420_reg_read(pd, MAC_CR) & (~MAC_CR_RXEN_);
	smsc9420_reg_write(pd, MAC_CR, mac_cr);
	smsc9420_pci_flush_write(pd);

	/* stop RX DMAC */
	dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
	dmac_control &= (~DMAC_CONTROL_SR_);
	smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
	smsc9420_pci_flush_write(pd);

	/* wait up to 10ms for receive to stop */
	while (timeOut--) {
		if (smsc9420_reg_read(pd, DMAC_STATUS) & DMAC_STS_RS_)
			break;
		udelay(10);
	}

	if (!timeOut)
		smsc_warn(IFDOWN, "RX DMAC did not stop! timeout.");

	/* ACK the Rx DMAC stop bit */
	smsc9420_reg_write(pd, DMAC_STATUS, DMAC_STS_RXPS_);
}

static irqreturn_t smsc9420_isr(int irq, void *dev_id)
{
	struct smsc9420_pdata *pd = dev_id;
	u32 int_cfg, int_sts, int_ctl;
	irqreturn_t ret = IRQ_NONE;
	ulong flags;

	BUG_ON(!pd);
	BUG_ON(!pd->base_addr);

	int_cfg = smsc9420_reg_read(pd, INT_CFG);

	/* check if it's our interrupt */
	if ((int_cfg & (INT_CFG_IRQ_EN_ | INT_CFG_IRQ_INT_)) !=
	    (INT_CFG_IRQ_EN_ | INT_CFG_IRQ_INT_))
		return IRQ_NONE;

	int_sts = smsc9420_reg_read(pd, INT_STAT);

	if (likely(INT_STAT_DMAC_INT_ & int_sts)) {
		u32 status = smsc9420_reg_read(pd, DMAC_STATUS);
		u32 ints_to_clear = 0;

		if (status & DMAC_STS_TX_) {
			ints_to_clear |= (DMAC_STS_TX_ | DMAC_STS_NIS_);
			netif_wake_queue(pd->dev);
		}

		if (status & DMAC_STS_RX_) {
			/* mask RX DMAC interrupts */
			u32 dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
			dma_intr_ena &= (~DMAC_INTR_ENA_RX_);
			smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
			smsc9420_pci_flush_write(pd);

			ints_to_clear |= (DMAC_STS_RX_ | DMAC_STS_NIS_);
			netif_rx_schedule(pd->dev, &pd->napi);
		}

		if (ints_to_clear)
			smsc9420_reg_write(pd, DMAC_STATUS, ints_to_clear);

		ret = IRQ_HANDLED;
	}

	if (unlikely(INT_STAT_SW_INT_ & int_sts)) {
		/* mask software interrupt */
		spin_lock_irqsave(&pd->int_lock, flags);
		int_ctl = smsc9420_reg_read(pd, INT_CTL);
		int_ctl &= (~INT_CTL_SW_INT_EN_);
		smsc9420_reg_write(pd, INT_CTL, int_ctl);
		spin_unlock_irqrestore(&pd->int_lock, flags);

		smsc9420_reg_write(pd, INT_STAT, INT_STAT_SW_INT_);
		pd->software_irq_signal = true;
		smp_wmb();

		ret = IRQ_HANDLED;
	}

	/* to ensure PCI write completion, we must perform a PCI read */
	smsc9420_pci_flush_write(pd);

	return ret;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void smsc9420_poll_controller(struct net_device *dev)
{
	disable_irq(dev->irq);
	smsc9420_isr(0, dev);
	enable_irq(dev->irq);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */

static void smsc9420_dmac_soft_reset(struct smsc9420_pdata *pd)
{
	smsc9420_reg_write(pd, BUS_MODE, BUS_MODE_SWR_);
	smsc9420_reg_read(pd, BUS_MODE);
	udelay(2);
	if (smsc9420_reg_read(pd, BUS_MODE) & BUS_MODE_SWR_)
		smsc_warn(DRV, "Software reset not cleared");
}

static int smsc9420_stop(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	u32 int_cfg;
	ulong flags;

	BUG_ON(!pd);
	BUG_ON(!pd->phy_dev);

	/* disable master interrupt */
	spin_lock_irqsave(&pd->int_lock, flags);
	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
	smsc9420_reg_write(pd, INT_CFG, int_cfg);
	spin_unlock_irqrestore(&pd->int_lock, flags);

	netif_tx_disable(dev);
	napi_disable(&pd->napi);

	smsc9420_stop_tx(pd);
	smsc9420_free_tx_ring(pd);

	smsc9420_stop_rx(pd);
	smsc9420_free_rx_ring(pd);

	free_irq(dev->irq, pd);

	smsc9420_dmac_soft_reset(pd);

	phy_stop(pd->phy_dev);

	phy_disconnect(pd->phy_dev);
	pd->phy_dev = NULL;
	mdiobus_unregister(pd->mii_bus);
	mdiobus_free(pd->mii_bus);

	return 0;
}

static void smsc9420_rx_count_stats(struct net_device *dev, u32 desc_status)
{
	if (unlikely(desc_status & RDES0_ERROR_SUMMARY_)) {
		dev->stats.rx_errors++;
		if (desc_status & RDES0_DESCRIPTOR_ERROR_)
			dev->stats.rx_over_errors++;
		else if (desc_status & (RDES0_FRAME_TOO_LONG_ |
			RDES0_RUNT_FRAME_ | RDES0_COLLISION_SEEN_))
			dev->stats.rx_frame_errors++;
		else if (desc_status & RDES0_CRC_ERROR_)
			dev->stats.rx_crc_errors++;
	}

	if (unlikely(desc_status & RDES0_LENGTH_ERROR_))
		dev->stats.rx_length_errors++;

	if (unlikely(!((desc_status & RDES0_LAST_DESCRIPTOR_) &&
		(desc_status & RDES0_FIRST_DESCRIPTOR_))))
		dev->stats.rx_length_errors++;

	if (desc_status & RDES0_MULTICAST_FRAME_)
		dev->stats.multicast++;
}

static void smsc9420_rx_handoff(struct smsc9420_pdata *pd, const int index,
				const u32 status)
{
	struct net_device *dev = pd->dev;
	struct sk_buff *skb;
	u16 packet_length = (status & RDES0_FRAME_LENGTH_MASK_)
		>> RDES0_FRAME_LENGTH_SHFT_;

	/* remove crc from packet lendth */
	packet_length -= 4;

	if (pd->rx_csum)
		packet_length -= 2;

	dev->stats.rx_packets++;
	dev->stats.rx_bytes += packet_length;

	pci_unmap_single(pd->pdev, pd->rx_buffers[index].mapping,
		PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
	pd->rx_buffers[index].mapping = 0;

	skb = pd->rx_buffers[index].skb;
	pd->rx_buffers[index].skb = NULL;

	if (pd->rx_csum) {
		u16 hw_csum = get_unaligned_le16(skb_tail_pointer(skb) +
			NET_IP_ALIGN + packet_length + 4);
		put_unaligned_le16(cpu_to_le16(hw_csum), &skb->csum);
		skb->ip_summed = CHECKSUM_COMPLETE;
	}

	skb_reserve(skb, NET_IP_ALIGN);
	skb_put(skb, packet_length);

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

	netif_receive_skb(skb);
	dev->last_rx = jiffies;
}

static int smsc9420_alloc_rx_buffer(struct smsc9420_pdata *pd, int index)
{
	struct sk_buff *skb = netdev_alloc_skb(pd->dev, PKT_BUF_SZ);
	dma_addr_t mapping;

	BUG_ON(pd->rx_buffers[index].skb);
	BUG_ON(pd->rx_buffers[index].mapping);

	if (unlikely(!skb)) {
		smsc_warn(RX_ERR, "Failed to allocate new skb!");
		return -ENOMEM;
	}

	skb->dev = pd->dev;

	mapping = pci_map_single(pd->pdev, skb_tail_pointer(skb),
				 PKT_BUF_SZ, PCI_DMA_FROMDEVICE);
	if (pci_dma_mapping_error(pd->pdev, mapping)) {
		dev_kfree_skb_any(skb);
		smsc_warn(RX_ERR, "pci_map_single failed!");
		return -ENOMEM;
	}

	pd->rx_buffers[index].skb = skb;
	pd->rx_buffers[index].mapping = mapping;
	pd->rx_ring[index].buffer1 = mapping + NET_IP_ALIGN;
	pd->rx_ring[index].status = RDES0_OWN_;
	wmb();

	return 0;
}

static void smsc9420_alloc_new_rx_buffers(struct smsc9420_pdata *pd)
{
	while (pd->rx_ring_tail != pd->rx_ring_head) {
		if (smsc9420_alloc_rx_buffer(pd, pd->rx_ring_tail))
			break;

		pd->rx_ring_tail = (pd->rx_ring_tail + 1) % RX_RING_SIZE;
	}
}

static int smsc9420_rx_poll(struct napi_struct *napi, int budget)
{
	struct smsc9420_pdata *pd =
		container_of(napi, struct smsc9420_pdata, napi);
	struct net_device *dev = pd->dev;
	u32 drop_frame_cnt, dma_intr_ena, status;
	int work_done;

	for (work_done = 0; work_done < budget; work_done++) {
		rmb();
		status = pd->rx_ring[pd->rx_ring_head].status;

		/* stop if DMAC owns this dma descriptor */
		if (status & RDES0_OWN_)
			break;

		smsc9420_rx_count_stats(dev, status);
		smsc9420_rx_handoff(pd, pd->rx_ring_head, status);
		pd->rx_ring_head = (pd->rx_ring_head + 1) % RX_RING_SIZE;
		smsc9420_alloc_new_rx_buffers(pd);
	}

	drop_frame_cnt = smsc9420_reg_read(pd, MISS_FRAME_CNTR);
	dev->stats.rx_dropped +=
	    (drop_frame_cnt & 0xFFFF) + ((drop_frame_cnt >> 17) & 0x3FF);

	/* Kick RXDMA */
	smsc9420_reg_write(pd, RX_POLL_DEMAND, 1);
	smsc9420_pci_flush_write(pd);

	if (work_done < budget) {
		netif_rx_complete(dev, &pd->napi);

		/* re-enable RX DMA interrupts */
		dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
		dma_intr_ena |= (DMAC_INTR_ENA_RX_ | DMAC_INTR_ENA_NIS_);
		smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
		smsc9420_pci_flush_write(pd);
	}
	return work_done;
}

static void
smsc9420_tx_update_stats(struct net_device *dev, u32 status, u32 length)
{
	if (unlikely(status & TDES0_ERROR_SUMMARY_)) {
		dev->stats.tx_errors++;
		if (status & (TDES0_EXCESSIVE_DEFERRAL_ |
			TDES0_EXCESSIVE_COLLISIONS_))
			dev->stats.tx_aborted_errors++;

		if (status & (TDES0_LOSS_OF_CARRIER_ | TDES0_NO_CARRIER_))
			dev->stats.tx_carrier_errors++;
	} else {
		dev->stats.tx_packets++;
		dev->stats.tx_bytes += (length & 0x7FF);
	}

	if (unlikely(status & TDES0_EXCESSIVE_COLLISIONS_)) {
		dev->stats.collisions += 16;
	} else {
		dev->stats.collisions +=
			(status & TDES0_COLLISION_COUNT_MASK_) >>
			TDES0_COLLISION_COUNT_SHFT_;
	}

	if (unlikely(status & TDES0_HEARTBEAT_FAIL_))
		dev->stats.tx_heartbeat_errors++;
}

/* Check for completed dma transfers, update stats and free skbs */
static void smsc9420_complete_tx(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);

	while (pd->tx_ring_tail != pd->tx_ring_head) {
		int index = pd->tx_ring_tail;
		u32 status, length;

		rmb();
		status = pd->tx_ring[index].status;
		length = pd->tx_ring[index].length;

		/* Check if DMA still owns this descriptor */
		if (unlikely(TDES0_OWN_ & status))
			break;

		smsc9420_tx_update_stats(dev, status, length);

		BUG_ON(!pd->tx_buffers[index].skb);
		BUG_ON(!pd->tx_buffers[index].mapping);

		pci_unmap_single(pd->pdev, pd->tx_buffers[index].mapping,
			pd->tx_buffers[index].skb->len, PCI_DMA_TODEVICE);
		pd->tx_buffers[index].mapping = 0;

		dev_kfree_skb_any(pd->tx_buffers[index].skb);
		pd->tx_buffers[index].skb = NULL;

		pd->tx_ring[index].buffer1 = 0;
		wmb();

		pd->tx_ring_tail = (pd->tx_ring_tail + 1) % TX_RING_SIZE;
	}
}

static int smsc9420_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	dma_addr_t mapping;
	int index = pd->tx_ring_head;
	u32 tmp_desc1;
	bool about_to_take_last_desc =
		(((pd->tx_ring_head + 2) % TX_RING_SIZE) == pd->tx_ring_tail);

	smsc9420_complete_tx(dev);

	rmb();
	BUG_ON(pd->tx_ring[index].status & TDES0_OWN_);
	BUG_ON(pd->tx_buffers[index].skb);
	BUG_ON(pd->tx_buffers[index].mapping);

	mapping = pci_map_single(pd->pdev, skb->data,
				 skb->len, PCI_DMA_TODEVICE);
	if (pci_dma_mapping_error(pd->pdev, mapping)) {
		smsc_warn(TX_ERR, "pci_map_single failed, dropping packet");
		return NETDEV_TX_BUSY;
	}

	pd->tx_buffers[index].skb = skb;
	pd->tx_buffers[index].mapping = mapping;

	tmp_desc1 = (TDES1_LS_ | ((u32)skb->len & 0x7FF));
	if (unlikely(about_to_take_last_desc)) {
		tmp_desc1 |= TDES1_IC_;
		netif_stop_queue(pd->dev);
	}

	/* check if we are at the last descriptor and need to set EOR */
	if (unlikely(index == (TX_RING_SIZE - 1)))
		tmp_desc1 |= TDES1_TER_;

	pd->tx_ring[index].buffer1 = mapping;
	pd->tx_ring[index].length = tmp_desc1;
	wmb();

	/* increment head */
	pd->tx_ring_head = (pd->tx_ring_head + 1) % TX_RING_SIZE;

	/* assign ownership to DMAC */
	pd->tx_ring[index].status = TDES0_OWN_;
	wmb();

	/* kick the DMA */
	smsc9420_reg_write(pd, TX_POLL_DEMAND, 1);
	smsc9420_pci_flush_write(pd);

	dev->trans_start = jiffies;

	return NETDEV_TX_OK;
}

static struct net_device_stats *smsc9420_get_stats(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	u32 counter = smsc9420_reg_read(pd, MISS_FRAME_CNTR);
	dev->stats.rx_dropped +=
	    (counter & 0x0000FFFF) + ((counter >> 17) & 0x000003FF);
	return &dev->stats;
}

static void smsc9420_set_multicast_list(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	u32 mac_cr = smsc9420_reg_read(pd, MAC_CR);

	if (dev->flags & IFF_PROMISC) {
		smsc_dbg(HW, "Promiscuous Mode Enabled");
		mac_cr |= MAC_CR_PRMS_;
		mac_cr &= (~MAC_CR_MCPAS_);
		mac_cr &= (~MAC_CR_HPFILT_);
	} else if (dev->flags & IFF_ALLMULTI) {
		smsc_dbg(HW, "Receive all Multicast Enabled");
		mac_cr &= (~MAC_CR_PRMS_);
		mac_cr |= MAC_CR_MCPAS_;
		mac_cr &= (~MAC_CR_HPFILT_);
	} else if (dev->mc_count > 0) {
		struct dev_mc_list *mc_list = dev->mc_list;
		u32 hash_lo = 0, hash_hi = 0;

		smsc_dbg(HW, "Multicast filter enabled");
		while (mc_list) {
			u32 bit_num = smsc9420_hash(mc_list->dmi_addr);
			u32 mask = 1 << (bit_num & 0x1F);

			if (bit_num & 0x20)
				hash_hi |= mask;
			else
				hash_lo |= mask;

			mc_list = mc_list->next;
		}
		smsc9420_reg_write(pd, HASHH, hash_hi);
		smsc9420_reg_write(pd, HASHL, hash_lo);

		mac_cr &= (~MAC_CR_PRMS_);
		mac_cr &= (~MAC_CR_MCPAS_);
		mac_cr |= MAC_CR_HPFILT_;
	} else {
		smsc_dbg(HW, "Receive own packets only.");
		smsc9420_reg_write(pd, HASHH, 0);
		smsc9420_reg_write(pd, HASHL, 0);

		mac_cr &= (~MAC_CR_PRMS_);
		mac_cr &= (~MAC_CR_MCPAS_);
		mac_cr &= (~MAC_CR_HPFILT_);
	}

	smsc9420_reg_write(pd, MAC_CR, mac_cr);
	smsc9420_pci_flush_write(pd);
}

static void smsc9420_phy_update_flowcontrol(struct smsc9420_pdata *pd)
{
	struct phy_device *phy_dev = pd->phy_dev;
	u32 flow;

	if (phy_dev->duplex == DUPLEX_FULL) {
		u16 lcladv = phy_read(phy_dev, MII_ADVERTISE);
		u16 rmtadv = phy_read(phy_dev, MII_LPA);
		u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);

		if (cap & FLOW_CTRL_RX)
			flow = 0xFFFF0002;
		else
			flow = 0;

		smsc_info(LINK, "rx pause %s, tx pause %s",
			(cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
			(cap & FLOW_CTRL_TX ? "enabled" : "disabled"));
	} else {
		smsc_info(LINK, "half duplex");
		flow = 0;
	}

	smsc9420_reg_write(pd, FLOW, flow);
}

/* Update link mode if anything has changed.  Called periodically when the
 * PHY is in polling mode, even if nothing has changed. */
static void smsc9420_phy_adjust_link(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	struct phy_device *phy_dev = pd->phy_dev;
	int carrier;

	if (phy_dev->duplex != pd->last_duplex) {
		u32 mac_cr = smsc9420_reg_read(pd, MAC_CR);
		if (phy_dev->duplex) {
			smsc_dbg(LINK, "full duplex mode");
			mac_cr |= MAC_CR_FDPX_;
		} else {
			smsc_dbg(LINK, "half duplex mode");
			mac_cr &= ~MAC_CR_FDPX_;
		}
		smsc9420_reg_write(pd, MAC_CR, mac_cr);

		smsc9420_phy_update_flowcontrol(pd);
		pd->last_duplex = phy_dev->duplex;
	}

	carrier = netif_carrier_ok(dev);
	if (carrier != pd->last_carrier) {
		if (carrier)
			smsc_dbg(LINK, "carrier OK");
		else
			smsc_dbg(LINK, "no carrier");
		pd->last_carrier = carrier;
	}
}

static int smsc9420_mii_probe(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	struct phy_device *phydev = NULL;

	BUG_ON(pd->phy_dev);

	/* Device only supports internal PHY at address 1 */
	if (!pd->mii_bus->phy_map[1]) {
		pr_err("%s: no PHY found at address 1\n", dev->name);
		return -ENODEV;
	}

	phydev = pd->mii_bus->phy_map[1];
	smsc_info(PROBE, "PHY addr %d, phy_id 0x%08X", phydev->addr,
		phydev->phy_id);

	phydev = phy_connect(dev, phydev->dev.bus_id,
		&smsc9420_phy_adjust_link, 0, PHY_INTERFACE_MODE_MII);

	if (IS_ERR(phydev)) {
		pr_err("%s: Could not attach to PHY\n", dev->name);
		return PTR_ERR(phydev);
	}

	pr_info("%s: attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
		dev->name, phydev->drv->name, phydev->dev.bus_id, phydev->irq);

	/* mask with MAC supported features */
	phydev->supported &= (PHY_BASIC_FEATURES | SUPPORTED_Pause |
			      SUPPORTED_Asym_Pause);
	phydev->advertising = phydev->supported;

	pd->phy_dev = phydev;
	pd->last_duplex = -1;
	pd->last_carrier = -1;

	return 0;
}

static int smsc9420_mii_init(struct net_device *dev)
{
	struct smsc9420_pdata *pd = netdev_priv(dev);
	int err = -ENXIO, i;

	pd->mii_bus = mdiobus_alloc();
	if (!pd->mii_bus) {
		err = -ENOMEM;
		goto err_out_1;
	}
	pd->mii_bus->name = DRV_MDIONAME;
	snprintf(pd->mii_bus->id, MII_BUS_ID_SIZE, "%x",
		(pd->pdev->bus->number << 8) | pd->pdev->devfn);
	pd->mii_bus->priv = pd;
	pd->mii_bus->read = smsc9420_mii_read;
	pd->mii_bus->write = smsc9420_mii_write;
	pd->mii_bus->irq = pd->phy_irq;
	for (i = 0; i < PHY_MAX_ADDR; ++i)
		pd->mii_bus->irq[i] = PHY_POLL;

	/* Mask all PHYs except ID 1 (internal) */
	pd->mii_bus->phy_mask = ~(1 << 1);

	if (mdiobus_register(pd->mii_bus)) {
		smsc_warn(PROBE, "Error registering mii bus");
		goto err_out_free_bus_2;
	}

	if (smsc9420_mii_probe(dev) < 0) {
		smsc_warn(PROBE, "Error probing mii bus");
		goto err_out_unregister_bus_3;
	}

	return 0;

err_out_unregister_bus_3:
	mdiobus_unregister(pd->mii_bus);
err_out_free_bus_2:
	mdiobus_free(pd->mii_bus);
err_out_1:
	return err;
}

static int smsc9420_alloc_tx_ring(struct smsc9420_pdata *pd)
{
	int i;

	BUG_ON(!pd->tx_ring);

	pd->tx_buffers = kmalloc((sizeof(struct smsc9420_ring_info) *
		TX_RING_SIZE), GFP_KERNEL);
	if (!pd->tx_buffers) {
		smsc_warn(IFUP, "Failed to allocated tx_buffers");
		return -ENOMEM;
	}

	/* Initialize the TX Ring */
	for (i = 0; i < TX_RING_SIZE; i++) {
		pd->tx_buffers[i].skb = NULL;
		pd->tx_buffers[i].mapping = 0;
		pd->tx_ring[i].status = 0;
		pd->tx_ring[i].length = 0;
		pd->tx_ring[i].buffer1 = 0;
		pd->tx_ring[i].buffer2 = 0;
	}
	pd->tx_ring[TX_RING_SIZE - 1].length = TDES1_TER_;
	wmb();

	pd->tx_ring_head = 0;
	pd->tx_ring_tail = 0;

	smsc9420_reg_write(pd, TX_BASE_ADDR, pd->tx_dma_addr);
	smsc9420_pci_flush_write(pd);

	return 0;
}

static int smsc9420_alloc_rx_ring(struct smsc9420_pdata *pd)
{
	int i;

	BUG_ON(!pd->rx_ring);

	pd->rx_buffers = kmalloc((sizeof(struct smsc9420_ring_info) *
		RX_RING_SIZE), GFP_KERNEL);
	if (pd->rx_buffers == NULL) {
		smsc_warn(IFUP, "Failed to allocated rx_buffers");
		goto out;
	}

	/* initialize the rx ring */
	for (i = 0; i < RX_RING_SIZE; i++) {
		pd->rx_ring[i].status = 0;
		pd->rx_ring[i].length = PKT_BUF_SZ;
		pd->rx_ring[i].buffer2 = 0;
		pd->rx_buffers[i].skb = NULL;
		pd->rx_buffers[i].mapping = 0;
	}
	pd->rx_ring[RX_RING_SIZE - 1].length = (PKT_BUF_SZ | RDES1_RER_);

	/* now allocate the entire ring of skbs */
	for (i = 0; i < RX_RING_SIZE; i++) {
		if (smsc9420_alloc_rx_buffer(pd, i)) {
			smsc_warn(IFUP, "failed to allocate rx skb %d", i);
			goto out_free_rx_skbs;
		}
	}

	pd->rx_ring_head = 0;
	pd->rx_ring_tail = 0;

	smsc9420_reg_write(pd, VLAN1, ETH_P_8021Q);
	smsc_dbg(IFUP, "VLAN1 = 0x%08x", smsc9420_reg_read(pd, VLAN1));

	if (pd->rx_csum) {
		/* Enable RX COE */
		u32 coe = smsc9420_reg_read(pd, COE_CR) | RX_COE_EN;
		smsc9420_reg_write(pd, COE_CR, coe);
		smsc_dbg(IFUP, "COE_CR = 0x%08x", coe);
	}

	smsc9420_reg_write(pd, RX_BASE_ADDR, pd->rx_dma_addr);
	smsc9420_pci_flush_write(pd);

	return 0;

out_free_rx_skbs:
	smsc9420_free_rx_ring(pd);
out:
	return -ENOMEM;
}

static int smsc9420_open(struct net_device *dev)
{
	struct smsc9420_pdata *pd;
	u32 bus_mode, mac_cr, dmac_control, int_cfg, dma_intr_ena, int_ctl;
	unsigned long flags;
	int result = 0, timeout;

	BUG_ON(!dev);
	pd = netdev_priv(dev);
	BUG_ON(!pd);

	if (!is_valid_ether_addr(dev->dev_addr)) {
		smsc_warn(IFUP, "dev_addr is not a valid MAC address");
		result = -EADDRNOTAVAIL;
		goto out_0;
	}

	netif_carrier_off(dev);

	/* disable, mask and acknowlege all interrupts */
	spin_lock_irqsave(&pd->int_lock, flags);
	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
	smsc9420_reg_write(pd, INT_CFG, int_cfg);
	smsc9420_reg_write(pd, INT_CTL, 0);
	spin_unlock_irqrestore(&pd->int_lock, flags);
	smsc9420_reg_write(pd, DMAC_INTR_ENA, 0);
	smsc9420_reg_write(pd, INT_STAT, 0xFFFFFFFF);
	smsc9420_pci_flush_write(pd);

	if (request_irq(dev->irq, smsc9420_isr, IRQF_SHARED | IRQF_DISABLED,
			DRV_NAME, pd)) {
		smsc_warn(IFUP, "Unable to use IRQ = %d", dev->irq);
		result = -ENODEV;
		goto out_0;
	}

	smsc9420_dmac_soft_reset(pd);

	/* make sure MAC_CR is sane */
	smsc9420_reg_write(pd, MAC_CR, 0);

	smsc9420_set_mac_address(dev);

	/* Configure GPIO pins to drive LEDs */
	smsc9420_reg_write(pd, GPIO_CFG,
		(GPIO_CFG_LED_3_ | GPIO_CFG_LED_2_ | GPIO_CFG_LED_1_));

	bus_mode = BUS_MODE_DMA_BURST_LENGTH_16;

#ifdef __BIG_ENDIAN
	bus_mode |= BUS_MODE_DBO_;
#endif

	smsc9420_reg_write(pd, BUS_MODE, bus_mode);

	smsc9420_pci_flush_write(pd);

	/* set bus master bridge arbitration priority for Rx and TX DMA */
	smsc9420_reg_write(pd, BUS_CFG, BUS_CFG_RXTXWEIGHT_4_1);

	smsc9420_reg_write(pd, DMAC_CONTROL,
		(DMAC_CONTROL_SF_ | DMAC_CONTROL_OSF_));

	smsc9420_pci_flush_write(pd);

	/* test the IRQ connection to the ISR */
	smsc_dbg(IFUP, "Testing ISR using IRQ %d", dev->irq);

	spin_lock_irqsave(&pd->int_lock, flags);
	/* configure interrupt deassertion timer and enable interrupts */
	int_cfg = smsc9420_reg_read(pd, INT_CFG) | INT_CFG_IRQ_EN_;
	int_cfg &= ~(INT_CFG_INT_DEAS_MASK);
	int_cfg |= (INT_DEAS_TIME & INT_CFG_INT_DEAS_MASK);
	smsc9420_reg_write(pd, INT_CFG, int_cfg);

	/* unmask software interrupt */
	int_ctl = smsc9420_reg_read(pd, INT_CTL) | INT_CTL_SW_INT_EN_;
	smsc9420_reg_write(pd, INT_CTL, int_ctl);
	spin_unlock_irqrestore(&pd->int_lock, flags);
	smsc9420_pci_flush_write(pd);

	timeout = 1000;
	pd->software_irq_signal = false;
	smp_wmb();
	while (timeout--) {
		if (pd->software_irq_signal)
			break;
		msleep(1);
	}

	/* disable interrupts */
	spin_lock_irqsave(&pd->int_lock, flags);
	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
	smsc9420_reg_write(pd, INT_CFG, int_cfg);
	spin_unlock_irqrestore(&pd->int_lock, flags);

	if (!pd->software_irq_signal) {
		smsc_warn(IFUP, "ISR failed signaling test");
		result = -ENODEV;
		goto out_free_irq_1;
	}

	smsc_dbg(IFUP, "ISR passed test using IRQ %d", dev->irq);

	result = smsc9420_alloc_tx_ring(pd);
	if (result) {
		smsc_warn(IFUP, "Failed to Initialize tx dma ring");
		result = -ENOMEM;
		goto out_free_irq_1;
	}

	result = smsc9420_alloc_rx_ring(pd);
	if (result) {
		smsc_warn(IFUP, "Failed to Initialize rx dma ring");
		result = -ENOMEM;
		goto out_free_tx_ring_2;
	}

	result = smsc9420_mii_init(dev);
	if (result) {
		smsc_warn(IFUP, "Failed to initialize Phy");
		result = -ENODEV;
		goto out_free_rx_ring_3;
	}

	/* Bring the PHY up */
	phy_start(pd->phy_dev);

	napi_enable(&pd->napi);

	/* start tx and rx */
	mac_cr = smsc9420_reg_read(pd, MAC_CR) | MAC_CR_TXEN_ | MAC_CR_RXEN_;
	smsc9420_reg_write(pd, MAC_CR, mac_cr);

	dmac_control = smsc9420_reg_read(pd, DMAC_CONTROL);
	dmac_control |= DMAC_CONTROL_ST_ | DMAC_CONTROL_SR_;
	smsc9420_reg_write(pd, DMAC_CONTROL, dmac_control);
	smsc9420_pci_flush_write(pd);

	dma_intr_ena = smsc9420_reg_read(pd, DMAC_INTR_ENA);
	dma_intr_ena |=
		(DMAC_INTR_ENA_TX_ | DMAC_INTR_ENA_RX_ | DMAC_INTR_ENA_NIS_);
	smsc9420_reg_write(pd, DMAC_INTR_ENA, dma_intr_ena);
	smsc9420_pci_flush_write(pd);

	netif_wake_queue(dev);

	smsc9420_reg_write(pd, RX_POLL_DEMAND, 1);

	/* enable interrupts */
	spin_lock_irqsave(&pd->int_lock, flags);
	int_cfg = smsc9420_reg_read(pd, INT_CFG) | INT_CFG_IRQ_EN_;
	smsc9420_reg_write(pd, INT_CFG, int_cfg);
	spin_unlock_irqrestore(&pd->int_lock, flags);

	return 0;

out_free_rx_ring_3:
	smsc9420_free_rx_ring(pd);
out_free_tx_ring_2:
	smsc9420_free_tx_ring(pd);
out_free_irq_1:
	free_irq(dev->irq, pd);
out_0:
	return result;
}

#ifdef CONFIG_PM

static int smsc9420_suspend(struct pci_dev *pdev, pm_message_t state)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	struct smsc9420_pdata *pd = netdev_priv(dev);
	u32 int_cfg;
	ulong flags;

	/* disable interrupts */
	spin_lock_irqsave(&pd->int_lock, flags);
	int_cfg = smsc9420_reg_read(pd, INT_CFG) & (~INT_CFG_IRQ_EN_);
	smsc9420_reg_write(pd, INT_CFG, int_cfg);
	spin_unlock_irqrestore(&pd->int_lock, flags);

	if (netif_running(dev)) {
		netif_tx_disable(dev);
		smsc9420_stop_tx(pd);
		smsc9420_free_tx_ring(pd);

		napi_disable(&pd->napi);
		smsc9420_stop_rx(pd);
		smsc9420_free_rx_ring(pd);

		free_irq(dev->irq, pd);

		netif_device_detach(dev);
	}

	pci_save_state(pdev);
	pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
	pci_disable_device(pdev);
	pci_set_power_state(pdev, pci_choose_state(pdev, state));

	return 0;
}

static int smsc9420_resume(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	struct smsc9420_pdata *pd = netdev_priv(dev);
	int err;

	pci_set_power_state(pdev, PCI_D0);
	pci_restore_state(pdev);

	err = pci_enable_device(pdev);
	if (err)
		return err;

	pci_set_master(pdev);

	err = pci_enable_wake(pdev, 0, 0);
	if (err)
		smsc_warn(IFUP, "pci_enable_wake failed: %d", err);

	if (netif_running(dev)) {
		err = smsc9420_open(dev);
		netif_device_attach(dev);
	}
	return err;
}

#endif /* CONFIG_PM */

static const struct net_device_ops smsc9420_netdev_ops = {
	.ndo_open		= smsc9420_open,
	.ndo_stop		= smsc9420_stop,
	.ndo_start_xmit		= smsc9420_hard_start_xmit,
	.ndo_get_stats		= smsc9420_get_stats,
	.ndo_set_multicast_list	= smsc9420_set_multicast_list,
	.ndo_do_ioctl		= smsc9420_do_ioctl,
	.ndo_validate_addr	= eth_validate_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= smsc9420_poll_controller,
#endif /* CONFIG_NET_POLL_CONTROLLER */
};

static int __devinit
smsc9420_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
	struct net_device *dev;
	struct smsc9420_pdata *pd;
	void __iomem *virt_addr;
	int result = 0;
	u32 id_rev;

	printk(KERN_INFO DRV_DESCRIPTION " version " DRV_VERSION "\n");

	/* First do the PCI initialisation */
	result = pci_enable_device(pdev);
	if (unlikely(result)) {
		printk(KERN_ERR "Cannot enable smsc9420\n");
		goto out_0;
	}

	pci_set_master(pdev);

	dev = alloc_etherdev(sizeof(*pd));
	if (!dev) {
		printk(KERN_ERR "ether device alloc failed\n");
		goto out_disable_pci_device_1;
	}

	SET_NETDEV_DEV(dev, &pdev->dev);

	if (!(pci_resource_flags(pdev, SMSC_BAR) & IORESOURCE_MEM)) {
		printk(KERN_ERR "Cannot find PCI device base address\n");
		goto out_free_netdev_2;
	}

	if ((pci_request_regions(pdev, DRV_NAME))) {
		printk(KERN_ERR "Cannot obtain PCI resources, aborting.\n");
		goto out_free_netdev_2;
	}

	if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
		printk(KERN_ERR "No usable DMA configuration, aborting.\n");
		goto out_free_regions_3;
	}

	virt_addr = ioremap(pci_resource_start(pdev, SMSC_BAR),
		pci_resource_len(pdev, SMSC_BAR));
	if (!virt_addr) {
		printk(KERN_ERR "Cannot map device registers, aborting.\n");
		goto out_free_regions_3;
	}

	/* registers are double mapped with 0 offset for LE and 0x200 for BE */
	virt_addr += LAN9420_CPSR_ENDIAN_OFFSET;

	dev->base_addr = (ulong)virt_addr;

	pd = netdev_priv(dev);

	/* pci descriptors are created in the PCI consistent area */
	pd->rx_ring = pci_alloc_consistent(pdev,
		sizeof(struct smsc9420_dma_desc) * RX_RING_SIZE +
		sizeof(struct smsc9420_dma_desc) * TX_RING_SIZE,
		&pd->rx_dma_addr);

	if (!pd->rx_ring)
		goto out_free_io_4;

	/* descriptors are aligned due to the nature of pci_alloc_consistent */
	pd->tx_ring = (struct smsc9420_dma_desc *)
	    (pd->rx_ring + RX_RING_SIZE);
	pd->tx_dma_addr = pd->rx_dma_addr +
	    sizeof(struct smsc9420_dma_desc) * RX_RING_SIZE;

	pd->pdev = pdev;
	pd->dev = dev;
	pd->base_addr = virt_addr;
	pd->msg_enable = smsc_debug;
	pd->rx_csum = true;

	smsc_dbg(PROBE, "lan_base=0x%08lx", (ulong)virt_addr);

	id_rev = smsc9420_reg_read(pd, ID_REV);
	switch (id_rev & 0xFFFF0000) {
	case 0x94200000:
		smsc_info(PROBE, "LAN9420 identified, ID_REV=0x%08X", id_rev);
		break;
	default:
		smsc_warn(PROBE, "LAN9420 NOT identified");
		smsc_warn(PROBE, "ID_REV=0x%08X", id_rev);
		goto out_free_dmadesc_5;
	}

	smsc9420_dmac_soft_reset(pd);
	smsc9420_eeprom_reload(pd);
	smsc9420_check_mac_address(dev);

	dev->netdev_ops = &smsc9420_netdev_ops;
	dev->ethtool_ops = &smsc9420_ethtool_ops;
	dev->irq = pdev->irq;

	netif_napi_add(dev, &pd->napi, smsc9420_rx_poll, NAPI_WEIGHT);

	result = register_netdev(dev);
	if (result) {
		smsc_warn(PROBE, "error %i registering device", result);
		goto out_free_dmadesc_5;
	}

	pci_set_drvdata(pdev, dev);

	spin_lock_init(&pd->int_lock);
	spin_lock_init(&pd->phy_lock);

	dev_info(&dev->dev, "MAC Address: %pM\n", dev->dev_addr);

	return 0;

out_free_dmadesc_5:
	pci_free_consistent(pdev, sizeof(struct smsc9420_dma_desc) *
		(RX_RING_SIZE + TX_RING_SIZE), pd->rx_ring, pd->rx_dma_addr);
out_free_io_4:
	iounmap(virt_addr - LAN9420_CPSR_ENDIAN_OFFSET);
out_free_regions_3:
	pci_release_regions(pdev);
out_free_netdev_2:
	free_netdev(dev);
out_disable_pci_device_1:
	pci_disable_device(pdev);
out_0:
	return -ENODEV;
}

static void __devexit smsc9420_remove(struct pci_dev *pdev)
{
	struct net_device *dev;
	struct smsc9420_pdata *pd;

	dev = pci_get_drvdata(pdev);
	if (!dev)
		return;

	pci_set_drvdata(pdev, NULL);

	pd = netdev_priv(dev);
	unregister_netdev(dev);

	/* tx_buffers and rx_buffers are freed in stop */
	BUG_ON(pd->tx_buffers);
	BUG_ON(pd->rx_buffers);

	BUG_ON(!pd->tx_ring);
	BUG_ON(!pd->rx_ring);

	pci_free_consistent(pdev, sizeof(struct smsc9420_dma_desc) *
		(RX_RING_SIZE + TX_RING_SIZE), pd->rx_ring, pd->rx_dma_addr);

	iounmap(pd->base_addr - LAN9420_CPSR_ENDIAN_OFFSET);
	pci_release_regions(pdev);
	free_netdev(dev);
	pci_disable_device(pdev);
}

static struct pci_driver smsc9420_driver = {
	.name = DRV_NAME,
	.id_table = smsc9420_id_table,
	.probe = smsc9420_probe,
	.remove = __devexit_p(smsc9420_remove),
#ifdef CONFIG_PM
	.suspend = smsc9420_suspend,
	.resume = smsc9420_resume,
#endif /* CONFIG_PM */
};

static int __init smsc9420_init_module(void)
{
	smsc_debug = netif_msg_init(debug, SMSC_MSG_DEFAULT);

	return pci_register_driver(&smsc9420_driver);
}

static void __exit smsc9420_exit_module(void)
{
	pci_unregister_driver(&smsc9420_driver);
}

module_init(smsc9420_init_module);
module_exit(smsc9420_exit_module);