summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/tundra/tsi108_eth.c
blob: 0624b71ab5d4a737400ba655518f44dbfbf96abf (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
/*******************************************************************************

  Copyright(c) 2006 Tundra Semiconductor Corporation.

  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.

*******************************************************************************/

/* This driver is based on the driver code originally developed
 * for the Intel IOC80314 (ForestLake) Gigabit Ethernet by
 * scott.wood@timesys.com  * Copyright (C) 2003 TimeSys Corporation
 *
 * Currently changes from original version are:
 * - porting to Tsi108-based platform and kernel 2.6 (kong.lai@tundra.com)
 * - modifications to handle two ports independently and support for
 *   additional PHY devices (alexandre.bounine@tundra.com)
 * - Get hardware information from platform device. (tie-fei.zang@freescale.com)
 *
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <linux/crc32.h>
#include <linux/mii.h>
#include <linux/device.h>
#include <linux/pci.h>
#include <linux/rtnetlink.h>
#include <linux/timer.h>
#include <linux/platform_device.h>
#include <linux/gfp.h>

#include <asm/io.h>
#include <asm/tsi108.h>

#include "tsi108_eth.h"

#define MII_READ_DELAY 10000	/* max link wait time in msec */

#define TSI108_RXRING_LEN     256

/* NOTE: The driver currently does not support receiving packets
 * larger than the buffer size, so don't decrease this (unless you
 * want to add such support).
 */
#define TSI108_RXBUF_SIZE     1536

#define TSI108_TXRING_LEN     256

#define TSI108_TX_INT_FREQ    64

/* Check the phy status every half a second. */
#define CHECK_PHY_INTERVAL (HZ/2)

static int tsi108_init_one(struct platform_device *pdev);
static int tsi108_ether_remove(struct platform_device *pdev);

struct tsi108_prv_data {
	void  __iomem *regs;	/* Base of normal regs */
	void  __iomem *phyregs;	/* Base of register bank used for PHY access */

	struct net_device *dev;
	struct napi_struct napi;

	unsigned int phy;		/* Index of PHY for this interface */
	unsigned int irq_num;
	unsigned int id;
	unsigned int phy_type;

	struct timer_list timer;/* Timer that triggers the check phy function */
	unsigned int rxtail;	/* Next entry in rxring to read */
	unsigned int rxhead;	/* Next entry in rxring to give a new buffer */
	unsigned int rxfree;	/* Number of free, allocated RX buffers */

	unsigned int rxpending;	/* Non-zero if there are still descriptors
				 * to be processed from a previous descriptor
				 * interrupt condition that has been cleared */

	unsigned int txtail;	/* Next TX descriptor to check status on */
	unsigned int txhead;	/* Next TX descriptor to use */

	/* Number of free TX descriptors.  This could be calculated from
	 * rxhead and rxtail if one descriptor were left unused to disambiguate
	 * full and empty conditions, but it's simpler to just keep track
	 * explicitly. */

	unsigned int txfree;

	unsigned int phy_ok;		/* The PHY is currently powered on. */

	/* PHY status (duplex is 1 for half, 2 for full,
	 * so that the default 0 indicates that neither has
	 * yet been configured). */

	unsigned int link_up;
	unsigned int speed;
	unsigned int duplex;

	tx_desc *txring;
	rx_desc *rxring;
	struct sk_buff *txskbs[TSI108_TXRING_LEN];
	struct sk_buff *rxskbs[TSI108_RXRING_LEN];

	dma_addr_t txdma, rxdma;

	/* txlock nests in misclock and phy_lock */

	spinlock_t txlock, misclock;

	/* stats is used to hold the upper bits of each hardware counter,
	 * and tmpstats is used to hold the full values for returning
	 * to the caller of get_stats().  They must be separate in case
	 * an overflow interrupt occurs before the stats are consumed.
	 */

	struct net_device_stats stats;
	struct net_device_stats tmpstats;

	/* These stats are kept separate in hardware, thus require individual
	 * fields for handling carry.  They are combined in get_stats.
	 */

	unsigned long rx_fcs;	/* Add to rx_frame_errors */
	unsigned long rx_short_fcs;	/* Add to rx_frame_errors */
	unsigned long rx_long_fcs;	/* Add to rx_frame_errors */
	unsigned long rx_underruns;	/* Add to rx_length_errors */
	unsigned long rx_overruns;	/* Add to rx_length_errors */

	unsigned long tx_coll_abort;	/* Add to tx_aborted_errors/collisions */
	unsigned long tx_pause_drop;	/* Add to tx_aborted_errors */

	unsigned long mc_hash[16];
	u32 msg_enable;			/* debug message level */
	struct mii_if_info mii_if;
	unsigned int init_media;
};

/* Structure for a device driver */

static struct platform_driver tsi_eth_driver = {
	.probe = tsi108_init_one,
	.remove = tsi108_ether_remove,
	.driver	= {
		.name = "tsi-ethernet",
	},
};

static void tsi108_timed_checker(struct timer_list *t);

#ifdef DEBUG
static void dump_eth_one(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);

	printk("Dumping %s...\n", dev->name);
	printk("intstat %x intmask %x phy_ok %d"
	       " link %d speed %d duplex %d\n",
	       TSI_READ(TSI108_EC_INTSTAT),
	       TSI_READ(TSI108_EC_INTMASK), data->phy_ok,
	       data->link_up, data->speed, data->duplex);

	printk("TX: head %d, tail %d, free %d, stat %x, estat %x, err %x\n",
	       data->txhead, data->txtail, data->txfree,
	       TSI_READ(TSI108_EC_TXSTAT),
	       TSI_READ(TSI108_EC_TXESTAT),
	       TSI_READ(TSI108_EC_TXERR));

	printk("RX: head %d, tail %d, free %d, stat %x,"
	       " estat %x, err %x, pending %d\n\n",
	       data->rxhead, data->rxtail, data->rxfree,
	       TSI_READ(TSI108_EC_RXSTAT),
	       TSI_READ(TSI108_EC_RXESTAT),
	       TSI_READ(TSI108_EC_RXERR), data->rxpending);
}
#endif

/* Synchronization is needed between the thread and up/down events.
 * Note that the PHY is accessed through the same registers for both
 * interfaces, so this can't be made interface-specific.
 */

static DEFINE_SPINLOCK(phy_lock);

static int tsi108_read_mii(struct tsi108_prv_data *data, int reg)
{
	unsigned i;

	TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
				(data->phy << TSI108_MAC_MII_ADDR_PHY) |
				(reg << TSI108_MAC_MII_ADDR_REG));
	TSI_WRITE_PHY(TSI108_MAC_MII_CMD, 0);
	TSI_WRITE_PHY(TSI108_MAC_MII_CMD, TSI108_MAC_MII_CMD_READ);
	for (i = 0; i < 100; i++) {
		if (!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
		      (TSI108_MAC_MII_IND_NOTVALID | TSI108_MAC_MII_IND_BUSY)))
			break;
		udelay(10);
	}

	if (i == 100)
		return 0xffff;
	else
		return TSI_READ_PHY(TSI108_MAC_MII_DATAIN);
}

static void tsi108_write_mii(struct tsi108_prv_data *data,
				int reg, u16 val)
{
	unsigned i = 100;
	TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
				(data->phy << TSI108_MAC_MII_ADDR_PHY) |
				(reg << TSI108_MAC_MII_ADDR_REG));
	TSI_WRITE_PHY(TSI108_MAC_MII_DATAOUT, val);
	while (i--) {
		if(!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
			TSI108_MAC_MII_IND_BUSY))
			break;
		udelay(10);
	}
}

static int tsi108_mdio_read(struct net_device *dev, int addr, int reg)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	return tsi108_read_mii(data, reg);
}

static void tsi108_mdio_write(struct net_device *dev, int addr, int reg, int val)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	tsi108_write_mii(data, reg, val);
}

static inline void tsi108_write_tbi(struct tsi108_prv_data *data,
					int reg, u16 val)
{
	unsigned i = 1000;
	TSI_WRITE(TSI108_MAC_MII_ADDR,
			     (0x1e << TSI108_MAC_MII_ADDR_PHY)
			     | (reg << TSI108_MAC_MII_ADDR_REG));
	TSI_WRITE(TSI108_MAC_MII_DATAOUT, val);
	while(i--) {
		if(!(TSI_READ(TSI108_MAC_MII_IND) & TSI108_MAC_MII_IND_BUSY))
			return;
		udelay(10);
	}
	printk(KERN_ERR "%s function time out\n", __func__);
}

static int mii_speed(struct mii_if_info *mii)
{
	int advert, lpa, val, media;
	int lpa2 = 0;
	int speed;

	if (!mii_link_ok(mii))
		return 0;

	val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
	if ((val & BMSR_ANEGCOMPLETE) == 0)
		return 0;

	advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
	lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
	media = mii_nway_result(advert & lpa);

	if (mii->supports_gmii)
		lpa2 = mii->mdio_read(mii->dev, mii->phy_id, MII_STAT1000);

	speed = lpa2 & (LPA_1000FULL | LPA_1000HALF) ? 1000 :
			(media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? 100 : 10);
	return speed;
}

static void tsi108_check_phy(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 mac_cfg2_reg, portctrl_reg;
	u32 duplex;
	u32 speed;
	unsigned long flags;

	spin_lock_irqsave(&phy_lock, flags);

	if (!data->phy_ok)
		goto out;

	duplex = mii_check_media(&data->mii_if, netif_msg_link(data), data->init_media);
	data->init_media = 0;

	if (netif_carrier_ok(dev)) {

		speed = mii_speed(&data->mii_if);

		if ((speed != data->speed) || duplex) {

			mac_cfg2_reg = TSI_READ(TSI108_MAC_CFG2);
			portctrl_reg = TSI_READ(TSI108_EC_PORTCTRL);

			mac_cfg2_reg &= ~TSI108_MAC_CFG2_IFACE_MASK;

			if (speed == 1000) {
				mac_cfg2_reg |= TSI108_MAC_CFG2_GIG;
				portctrl_reg &= ~TSI108_EC_PORTCTRL_NOGIG;
			} else {
				mac_cfg2_reg |= TSI108_MAC_CFG2_NOGIG;
				portctrl_reg |= TSI108_EC_PORTCTRL_NOGIG;
			}

			data->speed = speed;

			if (data->mii_if.full_duplex) {
				mac_cfg2_reg |= TSI108_MAC_CFG2_FULLDUPLEX;
				portctrl_reg &= ~TSI108_EC_PORTCTRL_HALFDUPLEX;
				data->duplex = 2;
			} else {
				mac_cfg2_reg &= ~TSI108_MAC_CFG2_FULLDUPLEX;
				portctrl_reg |= TSI108_EC_PORTCTRL_HALFDUPLEX;
				data->duplex = 1;
			}

			TSI_WRITE(TSI108_MAC_CFG2, mac_cfg2_reg);
			TSI_WRITE(TSI108_EC_PORTCTRL, portctrl_reg);
		}

		if (data->link_up == 0) {
			/* The manual says it can take 3-4 usecs for the speed change
			 * to take effect.
			 */
			udelay(5);

			spin_lock(&data->txlock);
			if (is_valid_ether_addr(dev->dev_addr) && data->txfree)
				netif_wake_queue(dev);

			data->link_up = 1;
			spin_unlock(&data->txlock);
		}
	} else {
		if (data->link_up == 1) {
			netif_stop_queue(dev);
			data->link_up = 0;
			printk(KERN_NOTICE "%s : link is down\n", dev->name);
		}

		goto out;
	}


out:
	spin_unlock_irqrestore(&phy_lock, flags);
}

static inline void
tsi108_stat_carry_one(int carry, int carry_bit, int carry_shift,
		      unsigned long *upper)
{
	if (carry & carry_bit)
		*upper += carry_shift;
}

static void tsi108_stat_carry(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 carry1, carry2;

	spin_lock_irq(&data->misclock);

	carry1 = TSI_READ(TSI108_STAT_CARRY1);
	carry2 = TSI_READ(TSI108_STAT_CARRY2);

	TSI_WRITE(TSI108_STAT_CARRY1, carry1);
	TSI_WRITE(TSI108_STAT_CARRY2, carry2);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXBYTES,
			      TSI108_STAT_RXBYTES_CARRY, &data->stats.rx_bytes);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXPKTS,
			      TSI108_STAT_RXPKTS_CARRY,
			      &data->stats.rx_packets);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXFCS,
			      TSI108_STAT_RXFCS_CARRY, &data->rx_fcs);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXMCAST,
			      TSI108_STAT_RXMCAST_CARRY,
			      &data->stats.multicast);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXALIGN,
			      TSI108_STAT_RXALIGN_CARRY,
			      &data->stats.rx_frame_errors);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXLENGTH,
			      TSI108_STAT_RXLENGTH_CARRY,
			      &data->stats.rx_length_errors);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXRUNT,
			      TSI108_STAT_RXRUNT_CARRY, &data->rx_underruns);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXJUMBO,
			      TSI108_STAT_RXJUMBO_CARRY, &data->rx_overruns);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXFRAG,
			      TSI108_STAT_RXFRAG_CARRY, &data->rx_short_fcs);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXJABBER,
			      TSI108_STAT_RXJABBER_CARRY, &data->rx_long_fcs);

	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXDROP,
			      TSI108_STAT_RXDROP_CARRY,
			      &data->stats.rx_missed_errors);

	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXBYTES,
			      TSI108_STAT_TXBYTES_CARRY, &data->stats.tx_bytes);

	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXPKTS,
			      TSI108_STAT_TXPKTS_CARRY,
			      &data->stats.tx_packets);

	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXEXDEF,
			      TSI108_STAT_TXEXDEF_CARRY,
			      &data->stats.tx_aborted_errors);

	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXEXCOL,
			      TSI108_STAT_TXEXCOL_CARRY, &data->tx_coll_abort);

	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXTCOL,
			      TSI108_STAT_TXTCOL_CARRY,
			      &data->stats.collisions);

	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXPAUSE,
			      TSI108_STAT_TXPAUSEDROP_CARRY,
			      &data->tx_pause_drop);

	spin_unlock_irq(&data->misclock);
}

/* Read a stat counter atomically with respect to carries.
 * data->misclock must be held.
 */
static inline unsigned long
tsi108_read_stat(struct tsi108_prv_data * data, int reg, int carry_bit,
		 int carry_shift, unsigned long *upper)
{
	int carryreg;
	unsigned long val;

	if (reg < 0xb0)
		carryreg = TSI108_STAT_CARRY1;
	else
		carryreg = TSI108_STAT_CARRY2;

      again:
	val = TSI_READ(reg) | *upper;

	/* Check to see if it overflowed, but the interrupt hasn't
	 * been serviced yet.  If so, handle the carry here, and
	 * try again.
	 */

	if (unlikely(TSI_READ(carryreg) & carry_bit)) {
		*upper += carry_shift;
		TSI_WRITE(carryreg, carry_bit);
		goto again;
	}

	return val;
}

static struct net_device_stats *tsi108_get_stats(struct net_device *dev)
{
	unsigned long excol;

	struct tsi108_prv_data *data = netdev_priv(dev);
	spin_lock_irq(&data->misclock);

	data->tmpstats.rx_packets =
	    tsi108_read_stat(data, TSI108_STAT_RXPKTS,
			     TSI108_STAT_CARRY1_RXPKTS,
			     TSI108_STAT_RXPKTS_CARRY, &data->stats.rx_packets);

	data->tmpstats.tx_packets =
	    tsi108_read_stat(data, TSI108_STAT_TXPKTS,
			     TSI108_STAT_CARRY2_TXPKTS,
			     TSI108_STAT_TXPKTS_CARRY, &data->stats.tx_packets);

	data->tmpstats.rx_bytes =
	    tsi108_read_stat(data, TSI108_STAT_RXBYTES,
			     TSI108_STAT_CARRY1_RXBYTES,
			     TSI108_STAT_RXBYTES_CARRY, &data->stats.rx_bytes);

	data->tmpstats.tx_bytes =
	    tsi108_read_stat(data, TSI108_STAT_TXBYTES,
			     TSI108_STAT_CARRY2_TXBYTES,
			     TSI108_STAT_TXBYTES_CARRY, &data->stats.tx_bytes);

	data->tmpstats.multicast =
	    tsi108_read_stat(data, TSI108_STAT_RXMCAST,
			     TSI108_STAT_CARRY1_RXMCAST,
			     TSI108_STAT_RXMCAST_CARRY, &data->stats.multicast);

	excol = tsi108_read_stat(data, TSI108_STAT_TXEXCOL,
				 TSI108_STAT_CARRY2_TXEXCOL,
				 TSI108_STAT_TXEXCOL_CARRY,
				 &data->tx_coll_abort);

	data->tmpstats.collisions =
	    tsi108_read_stat(data, TSI108_STAT_TXTCOL,
			     TSI108_STAT_CARRY2_TXTCOL,
			     TSI108_STAT_TXTCOL_CARRY, &data->stats.collisions);

	data->tmpstats.collisions += excol;

	data->tmpstats.rx_length_errors =
	    tsi108_read_stat(data, TSI108_STAT_RXLENGTH,
			     TSI108_STAT_CARRY1_RXLENGTH,
			     TSI108_STAT_RXLENGTH_CARRY,
			     &data->stats.rx_length_errors);

	data->tmpstats.rx_length_errors +=
	    tsi108_read_stat(data, TSI108_STAT_RXRUNT,
			     TSI108_STAT_CARRY1_RXRUNT,
			     TSI108_STAT_RXRUNT_CARRY, &data->rx_underruns);

	data->tmpstats.rx_length_errors +=
	    tsi108_read_stat(data, TSI108_STAT_RXJUMBO,
			     TSI108_STAT_CARRY1_RXJUMBO,
			     TSI108_STAT_RXJUMBO_CARRY, &data->rx_overruns);

	data->tmpstats.rx_frame_errors =
	    tsi108_read_stat(data, TSI108_STAT_RXALIGN,
			     TSI108_STAT_CARRY1_RXALIGN,
			     TSI108_STAT_RXALIGN_CARRY,
			     &data->stats.rx_frame_errors);

	data->tmpstats.rx_frame_errors +=
	    tsi108_read_stat(data, TSI108_STAT_RXFCS,
			     TSI108_STAT_CARRY1_RXFCS, TSI108_STAT_RXFCS_CARRY,
			     &data->rx_fcs);

	data->tmpstats.rx_frame_errors +=
	    tsi108_read_stat(data, TSI108_STAT_RXFRAG,
			     TSI108_STAT_CARRY1_RXFRAG,
			     TSI108_STAT_RXFRAG_CARRY, &data->rx_short_fcs);

	data->tmpstats.rx_missed_errors =
	    tsi108_read_stat(data, TSI108_STAT_RXDROP,
			     TSI108_STAT_CARRY1_RXDROP,
			     TSI108_STAT_RXDROP_CARRY,
			     &data->stats.rx_missed_errors);

	/* These three are maintained by software. */
	data->tmpstats.rx_fifo_errors = data->stats.rx_fifo_errors;
	data->tmpstats.rx_crc_errors = data->stats.rx_crc_errors;

	data->tmpstats.tx_aborted_errors =
	    tsi108_read_stat(data, TSI108_STAT_TXEXDEF,
			     TSI108_STAT_CARRY2_TXEXDEF,
			     TSI108_STAT_TXEXDEF_CARRY,
			     &data->stats.tx_aborted_errors);

	data->tmpstats.tx_aborted_errors +=
	    tsi108_read_stat(data, TSI108_STAT_TXPAUSEDROP,
			     TSI108_STAT_CARRY2_TXPAUSE,
			     TSI108_STAT_TXPAUSEDROP_CARRY,
			     &data->tx_pause_drop);

	data->tmpstats.tx_aborted_errors += excol;

	data->tmpstats.tx_errors = data->tmpstats.tx_aborted_errors;
	data->tmpstats.rx_errors = data->tmpstats.rx_length_errors +
	    data->tmpstats.rx_crc_errors +
	    data->tmpstats.rx_frame_errors +
	    data->tmpstats.rx_fifo_errors + data->tmpstats.rx_missed_errors;

	spin_unlock_irq(&data->misclock);
	return &data->tmpstats;
}

static void tsi108_restart_rx(struct tsi108_prv_data * data, struct net_device *dev)
{
	TSI_WRITE(TSI108_EC_RXQ_PTRHIGH,
			     TSI108_EC_RXQ_PTRHIGH_VALID);

	TSI_WRITE(TSI108_EC_RXCTRL, TSI108_EC_RXCTRL_GO
			     | TSI108_EC_RXCTRL_QUEUE0);
}

static void tsi108_restart_tx(struct tsi108_prv_data * data)
{
	TSI_WRITE(TSI108_EC_TXQ_PTRHIGH,
			     TSI108_EC_TXQ_PTRHIGH_VALID);

	TSI_WRITE(TSI108_EC_TXCTRL, TSI108_EC_TXCTRL_IDLEINT |
			     TSI108_EC_TXCTRL_GO | TSI108_EC_TXCTRL_QUEUE0);
}

/* txlock must be held by caller, with IRQs disabled, and
 * with permission to re-enable them when the lock is dropped.
 */
static void tsi108_complete_tx(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	int tx;
	struct sk_buff *skb;
	int release = 0;

	while (!data->txfree || data->txhead != data->txtail) {
		tx = data->txtail;

		if (data->txring[tx].misc & TSI108_TX_OWN)
			break;

		skb = data->txskbs[tx];

		if (!(data->txring[tx].misc & TSI108_TX_OK))
			printk("%s: bad tx packet, misc %x\n",
			       dev->name, data->txring[tx].misc);

		data->txtail = (data->txtail + 1) % TSI108_TXRING_LEN;
		data->txfree++;

		if (data->txring[tx].misc & TSI108_TX_EOF) {
			dev_kfree_skb_any(skb);
			release++;
		}
	}

	if (release) {
		if (is_valid_ether_addr(dev->dev_addr) && data->link_up)
			netif_wake_queue(dev);
	}
}

static int tsi108_send_packet(struct sk_buff * skb, struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	int frags = skb_shinfo(skb)->nr_frags + 1;
	int i;

	if (!data->phy_ok && net_ratelimit())
		printk(KERN_ERR "%s: Transmit while PHY is down!\n", dev->name);

	if (!data->link_up) {
		printk(KERN_ERR "%s: Transmit while link is down!\n",
		       dev->name);
		netif_stop_queue(dev);
		return NETDEV_TX_BUSY;
	}

	if (data->txfree < MAX_SKB_FRAGS + 1) {
		netif_stop_queue(dev);

		if (net_ratelimit())
			printk(KERN_ERR "%s: Transmit with full tx ring!\n",
			       dev->name);
		return NETDEV_TX_BUSY;
	}

	if (data->txfree - frags < MAX_SKB_FRAGS + 1) {
		netif_stop_queue(dev);
	}

	spin_lock_irq(&data->txlock);

	for (i = 0; i < frags; i++) {
		int misc = 0;
		int tx = data->txhead;

		/* This is done to mark every TSI108_TX_INT_FREQ tx buffers with
		 * the interrupt bit.  TX descriptor-complete interrupts are
		 * enabled when the queue fills up, and masked when there is
		 * still free space.  This way, when saturating the outbound
		 * link, the tx interrupts are kept to a reasonable level.
		 * When the queue is not full, reclamation of skbs still occurs
		 * as new packets are transmitted, or on a queue-empty
		 * interrupt.
		 */

		if ((tx % TSI108_TX_INT_FREQ == 0) &&
		    ((TSI108_TXRING_LEN - data->txfree) >= TSI108_TX_INT_FREQ))
			misc = TSI108_TX_INT;

		data->txskbs[tx] = skb;

		if (i == 0) {
			data->txring[tx].buf0 = dma_map_single(NULL, skb->data,
					skb_headlen(skb), DMA_TO_DEVICE);
			data->txring[tx].len = skb_headlen(skb);
			misc |= TSI108_TX_SOF;
		} else {
			const skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];

			data->txring[tx].buf0 = skb_frag_dma_map(NULL, frag,
								 0,
								 skb_frag_size(frag),
								 DMA_TO_DEVICE);
			data->txring[tx].len = skb_frag_size(frag);
		}

		if (i == frags - 1)
			misc |= TSI108_TX_EOF;

		if (netif_msg_pktdata(data)) {
			int i;
			printk("%s: Tx Frame contents (%d)\n", dev->name,
			       skb->len);
			for (i = 0; i < skb->len; i++)
				printk(" %2.2x", skb->data[i]);
			printk(".\n");
		}
		data->txring[tx].misc = misc | TSI108_TX_OWN;

		data->txhead = (data->txhead + 1) % TSI108_TXRING_LEN;
		data->txfree--;
	}

	tsi108_complete_tx(dev);

	/* This must be done after the check for completed tx descriptors,
	 * so that the tail pointer is correct.
	 */

	if (!(TSI_READ(TSI108_EC_TXSTAT) & TSI108_EC_TXSTAT_QUEUE0))
		tsi108_restart_tx(data);

	spin_unlock_irq(&data->txlock);
	return NETDEV_TX_OK;
}

static int tsi108_complete_rx(struct net_device *dev, int budget)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	int done = 0;

	while (data->rxfree && done != budget) {
		int rx = data->rxtail;
		struct sk_buff *skb;

		if (data->rxring[rx].misc & TSI108_RX_OWN)
			break;

		skb = data->rxskbs[rx];
		data->rxtail = (data->rxtail + 1) % TSI108_RXRING_LEN;
		data->rxfree--;
		done++;

		if (data->rxring[rx].misc & TSI108_RX_BAD) {
			spin_lock_irq(&data->misclock);

			if (data->rxring[rx].misc & TSI108_RX_CRC)
				data->stats.rx_crc_errors++;
			if (data->rxring[rx].misc & TSI108_RX_OVER)
				data->stats.rx_fifo_errors++;

			spin_unlock_irq(&data->misclock);

			dev_kfree_skb_any(skb);
			continue;
		}
		if (netif_msg_pktdata(data)) {
			int i;
			printk("%s: Rx Frame contents (%d)\n",
			       dev->name, data->rxring[rx].len);
			for (i = 0; i < data->rxring[rx].len; i++)
				printk(" %2.2x", skb->data[i]);
			printk(".\n");
		}

		skb_put(skb, data->rxring[rx].len);
		skb->protocol = eth_type_trans(skb, dev);
		netif_receive_skb(skb);
	}

	return done;
}

static int tsi108_refill_rx(struct net_device *dev, int budget)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	int done = 0;

	while (data->rxfree != TSI108_RXRING_LEN && done != budget) {
		int rx = data->rxhead;
		struct sk_buff *skb;

		skb = netdev_alloc_skb_ip_align(dev, TSI108_RXBUF_SIZE);
		data->rxskbs[rx] = skb;
		if (!skb)
			break;

		data->rxring[rx].buf0 = dma_map_single(NULL, skb->data,
							TSI108_RX_SKB_SIZE,
							DMA_FROM_DEVICE);

		/* Sometimes the hardware sets blen to zero after packet
		 * reception, even though the manual says that it's only ever
		 * modified by the driver.
		 */

		data->rxring[rx].blen = TSI108_RX_SKB_SIZE;
		data->rxring[rx].misc = TSI108_RX_OWN | TSI108_RX_INT;

		data->rxhead = (data->rxhead + 1) % TSI108_RXRING_LEN;
		data->rxfree++;
		done++;
	}

	if (done != 0 && !(TSI_READ(TSI108_EC_RXSTAT) &
			   TSI108_EC_RXSTAT_QUEUE0))
		tsi108_restart_rx(data, dev);

	return done;
}

static int tsi108_poll(struct napi_struct *napi, int budget)
{
	struct tsi108_prv_data *data = container_of(napi, struct tsi108_prv_data, napi);
	struct net_device *dev = data->dev;
	u32 estat = TSI_READ(TSI108_EC_RXESTAT);
	u32 intstat = TSI_READ(TSI108_EC_INTSTAT);
	int num_received = 0, num_filled = 0;

	intstat &= TSI108_INT_RXQUEUE0 | TSI108_INT_RXTHRESH |
	    TSI108_INT_RXOVERRUN | TSI108_INT_RXERROR | TSI108_INT_RXWAIT;

	TSI_WRITE(TSI108_EC_RXESTAT, estat);
	TSI_WRITE(TSI108_EC_INTSTAT, intstat);

	if (data->rxpending || (estat & TSI108_EC_RXESTAT_Q0_DESCINT))
		num_received = tsi108_complete_rx(dev, budget);

	/* This should normally fill no more slots than the number of
	 * packets received in tsi108_complete_rx().  The exception
	 * is when we previously ran out of memory for RX SKBs.  In that
	 * case, it's helpful to obey the budget, not only so that the
	 * CPU isn't hogged, but so that memory (which may still be low)
	 * is not hogged by one device.
	 *
	 * A work unit is considered to be two SKBs to allow us to catch
	 * up when the ring has shrunk due to out-of-memory but we're
	 * still removing the full budget's worth of packets each time.
	 */

	if (data->rxfree < TSI108_RXRING_LEN)
		num_filled = tsi108_refill_rx(dev, budget * 2);

	if (intstat & TSI108_INT_RXERROR) {
		u32 err = TSI_READ(TSI108_EC_RXERR);
		TSI_WRITE(TSI108_EC_RXERR, err);

		if (err) {
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: RX error %x\n",
				       dev->name, err);

			if (!(TSI_READ(TSI108_EC_RXSTAT) &
			      TSI108_EC_RXSTAT_QUEUE0))
				tsi108_restart_rx(data, dev);
		}
	}

	if (intstat & TSI108_INT_RXOVERRUN) {
		spin_lock_irq(&data->misclock);
		data->stats.rx_fifo_errors++;
		spin_unlock_irq(&data->misclock);
	}

	if (num_received < budget) {
		data->rxpending = 0;
		napi_complete_done(napi, num_received);

		TSI_WRITE(TSI108_EC_INTMASK,
				     TSI_READ(TSI108_EC_INTMASK)
				     & ~(TSI108_INT_RXQUEUE0
					 | TSI108_INT_RXTHRESH |
					 TSI108_INT_RXOVERRUN |
					 TSI108_INT_RXERROR |
					 TSI108_INT_RXWAIT));
	} else {
		data->rxpending = 1;
	}

	return num_received;
}

static void tsi108_rx_int(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);

	/* A race could cause dev to already be scheduled, so it's not an
	 * error if that happens (and interrupts shouldn't be re-masked,
	 * because that can cause harmful races, if poll has already
	 * unmasked them but not cleared LINK_STATE_SCHED).
	 *
	 * This can happen if this code races with tsi108_poll(), which masks
	 * the interrupts after tsi108_irq_one() read the mask, but before
	 * napi_schedule is called.  It could also happen due to calls
	 * from tsi108_check_rxring().
	 */

	if (napi_schedule_prep(&data->napi)) {
		/* Mask, rather than ack, the receive interrupts.  The ack
		 * will happen in tsi108_poll().
		 */

		TSI_WRITE(TSI108_EC_INTMASK,
				     TSI_READ(TSI108_EC_INTMASK) |
				     TSI108_INT_RXQUEUE0
				     | TSI108_INT_RXTHRESH |
				     TSI108_INT_RXOVERRUN | TSI108_INT_RXERROR |
				     TSI108_INT_RXWAIT);
		__napi_schedule(&data->napi);
	} else {
		if (!netif_running(dev)) {
			/* This can happen if an interrupt occurs while the
			 * interface is being brought down, as the START
			 * bit is cleared before the stop function is called.
			 *
			 * In this case, the interrupts must be masked, or
			 * they will continue indefinitely.
			 *
			 * There's a race here if the interface is brought down
			 * and then up in rapid succession, as the device could
			 * be made running after the above check and before
			 * the masking below.  This will only happen if the IRQ
			 * thread has a lower priority than the task brining
			 * up the interface.  Fixing this race would likely
			 * require changes in generic code.
			 */

			TSI_WRITE(TSI108_EC_INTMASK,
					     TSI_READ
					     (TSI108_EC_INTMASK) |
					     TSI108_INT_RXQUEUE0 |
					     TSI108_INT_RXTHRESH |
					     TSI108_INT_RXOVERRUN |
					     TSI108_INT_RXERROR |
					     TSI108_INT_RXWAIT);
		}
	}
}

/* If the RX ring has run out of memory, try periodically
 * to allocate some more, as otherwise poll would never
 * get called (apart from the initial end-of-queue condition).
 *
 * This is called once per second (by default) from the thread.
 */

static void tsi108_check_rxring(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);

	/* A poll is scheduled, as opposed to caling tsi108_refill_rx
	 * directly, so as to keep the receive path single-threaded
	 * (and thus not needing a lock).
	 */

	if (netif_running(dev) && data->rxfree < TSI108_RXRING_LEN / 4)
		tsi108_rx_int(dev);
}

static void tsi108_tx_int(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 estat = TSI_READ(TSI108_EC_TXESTAT);

	TSI_WRITE(TSI108_EC_TXESTAT, estat);
	TSI_WRITE(TSI108_EC_INTSTAT, TSI108_INT_TXQUEUE0 |
			     TSI108_INT_TXIDLE | TSI108_INT_TXERROR);
	if (estat & TSI108_EC_TXESTAT_Q0_ERR) {
		u32 err = TSI_READ(TSI108_EC_TXERR);
		TSI_WRITE(TSI108_EC_TXERR, err);

		if (err && net_ratelimit())
			printk(KERN_ERR "%s: TX error %x\n", dev->name, err);
	}

	if (estat & (TSI108_EC_TXESTAT_Q0_DESCINT | TSI108_EC_TXESTAT_Q0_EOQ)) {
		spin_lock(&data->txlock);
		tsi108_complete_tx(dev);
		spin_unlock(&data->txlock);
	}
}


static irqreturn_t tsi108_irq(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 stat = TSI_READ(TSI108_EC_INTSTAT);

	if (!(stat & TSI108_INT_ANY))
		return IRQ_NONE;	/* Not our interrupt */

	stat &= ~TSI_READ(TSI108_EC_INTMASK);

	if (stat & (TSI108_INT_TXQUEUE0 | TSI108_INT_TXIDLE |
		    TSI108_INT_TXERROR))
		tsi108_tx_int(dev);
	if (stat & (TSI108_INT_RXQUEUE0 | TSI108_INT_RXTHRESH |
		    TSI108_INT_RXWAIT | TSI108_INT_RXOVERRUN |
		    TSI108_INT_RXERROR))
		tsi108_rx_int(dev);

	if (stat & TSI108_INT_SFN) {
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: SFN error\n", dev->name);
		TSI_WRITE(TSI108_EC_INTSTAT, TSI108_INT_SFN);
	}

	if (stat & TSI108_INT_STATCARRY) {
		tsi108_stat_carry(dev);
		TSI_WRITE(TSI108_EC_INTSTAT, TSI108_INT_STATCARRY);
	}

	return IRQ_HANDLED;
}

static void tsi108_stop_ethernet(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	int i = 1000;
	/* Disable all TX and RX queues ... */
	TSI_WRITE(TSI108_EC_TXCTRL, 0);
	TSI_WRITE(TSI108_EC_RXCTRL, 0);

	/* ...and wait for them to become idle */
	while(i--) {
		if(!(TSI_READ(TSI108_EC_TXSTAT) & TSI108_EC_TXSTAT_ACTIVE))
			break;
		udelay(10);
	}
	i = 1000;
	while(i--){
		if(!(TSI_READ(TSI108_EC_RXSTAT) & TSI108_EC_RXSTAT_ACTIVE))
			return;
		udelay(10);
	}
	printk(KERN_ERR "%s function time out\n", __func__);
}

static void tsi108_reset_ether(struct tsi108_prv_data * data)
{
	TSI_WRITE(TSI108_MAC_CFG1, TSI108_MAC_CFG1_SOFTRST);
	udelay(100);
	TSI_WRITE(TSI108_MAC_CFG1, 0);

	TSI_WRITE(TSI108_EC_PORTCTRL, TSI108_EC_PORTCTRL_STATRST);
	udelay(100);
	TSI_WRITE(TSI108_EC_PORTCTRL,
			     TSI_READ(TSI108_EC_PORTCTRL) &
			     ~TSI108_EC_PORTCTRL_STATRST);

	TSI_WRITE(TSI108_EC_TXCFG, TSI108_EC_TXCFG_RST);
	udelay(100);
	TSI_WRITE(TSI108_EC_TXCFG,
			     TSI_READ(TSI108_EC_TXCFG) &
			     ~TSI108_EC_TXCFG_RST);

	TSI_WRITE(TSI108_EC_RXCFG, TSI108_EC_RXCFG_RST);
	udelay(100);
	TSI_WRITE(TSI108_EC_RXCFG,
			     TSI_READ(TSI108_EC_RXCFG) &
			     ~TSI108_EC_RXCFG_RST);

	TSI_WRITE(TSI108_MAC_MII_MGMT_CFG,
			     TSI_READ(TSI108_MAC_MII_MGMT_CFG) |
			     TSI108_MAC_MII_MGMT_RST);
	udelay(100);
	TSI_WRITE(TSI108_MAC_MII_MGMT_CFG,
			     (TSI_READ(TSI108_MAC_MII_MGMT_CFG) &
			     ~(TSI108_MAC_MII_MGMT_RST |
			       TSI108_MAC_MII_MGMT_CLK)) | 0x07);
}

static int tsi108_get_mac(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 word1 = TSI_READ(TSI108_MAC_ADDR1);
	u32 word2 = TSI_READ(TSI108_MAC_ADDR2);

	/* Note that the octets are reversed from what the manual says,
	 * producing an even weirder ordering...
	 */
	if (word2 == 0 && word1 == 0) {
		dev->dev_addr[0] = 0x00;
		dev->dev_addr[1] = 0x06;
		dev->dev_addr[2] = 0xd2;
		dev->dev_addr[3] = 0x00;
		dev->dev_addr[4] = 0x00;
		if (0x8 == data->phy)
			dev->dev_addr[5] = 0x01;
		else
			dev->dev_addr[5] = 0x02;

		word2 = (dev->dev_addr[0] << 16) | (dev->dev_addr[1] << 24);

		word1 = (dev->dev_addr[2] << 0) | (dev->dev_addr[3] << 8) |
		    (dev->dev_addr[4] << 16) | (dev->dev_addr[5] << 24);

		TSI_WRITE(TSI108_MAC_ADDR1, word1);
		TSI_WRITE(TSI108_MAC_ADDR2, word2);
	} else {
		dev->dev_addr[0] = (word2 >> 16) & 0xff;
		dev->dev_addr[1] = (word2 >> 24) & 0xff;
		dev->dev_addr[2] = (word1 >> 0) & 0xff;
		dev->dev_addr[3] = (word1 >> 8) & 0xff;
		dev->dev_addr[4] = (word1 >> 16) & 0xff;
		dev->dev_addr[5] = (word1 >> 24) & 0xff;
	}

	if (!is_valid_ether_addr(dev->dev_addr)) {
		printk(KERN_ERR
		       "%s: Invalid MAC address. word1: %08x, word2: %08x\n",
		       dev->name, word1, word2);
		return -EINVAL;
	}

	return 0;
}

static int tsi108_set_mac(struct net_device *dev, void *addr)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 word1, word2;
	int i;

	if (!is_valid_ether_addr(addr))
		return -EADDRNOTAVAIL;

	for (i = 0; i < 6; i++)
		/* +2 is for the offset of the HW addr type */
		dev->dev_addr[i] = ((unsigned char *)addr)[i + 2];

	word2 = (dev->dev_addr[0] << 16) | (dev->dev_addr[1] << 24);

	word1 = (dev->dev_addr[2] << 0) | (dev->dev_addr[3] << 8) |
	    (dev->dev_addr[4] << 16) | (dev->dev_addr[5] << 24);

	spin_lock_irq(&data->misclock);
	TSI_WRITE(TSI108_MAC_ADDR1, word1);
	TSI_WRITE(TSI108_MAC_ADDR2, word2);
	spin_lock(&data->txlock);

	if (data->txfree && data->link_up)
		netif_wake_queue(dev);

	spin_unlock(&data->txlock);
	spin_unlock_irq(&data->misclock);
	return 0;
}

/* Protected by dev->xmit_lock. */
static void tsi108_set_rx_mode(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 rxcfg = TSI_READ(TSI108_EC_RXCFG);

	if (dev->flags & IFF_PROMISC) {
		rxcfg &= ~(TSI108_EC_RXCFG_UC_HASH | TSI108_EC_RXCFG_MC_HASH);
		rxcfg |= TSI108_EC_RXCFG_UFE | TSI108_EC_RXCFG_MFE;
		goto out;
	}

	rxcfg &= ~(TSI108_EC_RXCFG_UFE | TSI108_EC_RXCFG_MFE);

	if (dev->flags & IFF_ALLMULTI || !netdev_mc_empty(dev)) {
		int i;
		struct netdev_hw_addr *ha;
		rxcfg |= TSI108_EC_RXCFG_MFE | TSI108_EC_RXCFG_MC_HASH;

		memset(data->mc_hash, 0, sizeof(data->mc_hash));

		netdev_for_each_mc_addr(ha, dev) {
			u32 hash, crc;

			crc = ether_crc(6, ha->addr);
			hash = crc >> 23;
			__set_bit(hash, &data->mc_hash[0]);
		}

		TSI_WRITE(TSI108_EC_HASHADDR,
				     TSI108_EC_HASHADDR_AUTOINC |
				     TSI108_EC_HASHADDR_MCAST);

		for (i = 0; i < 16; i++) {
			/* The manual says that the hardware may drop
			 * back-to-back writes to the data register.
			 */
			udelay(1);
			TSI_WRITE(TSI108_EC_HASHDATA,
					     data->mc_hash[i]);
		}
	}

      out:
	TSI_WRITE(TSI108_EC_RXCFG, rxcfg);
}

static void tsi108_init_phy(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	u32 i = 0;
	u16 phyval = 0;
	unsigned long flags;

	spin_lock_irqsave(&phy_lock, flags);

	tsi108_write_mii(data, MII_BMCR, BMCR_RESET);
	while (--i) {
		if(!(tsi108_read_mii(data, MII_BMCR) & BMCR_RESET))
			break;
		udelay(10);
	}
	if (i == 0)
		printk(KERN_ERR "%s function time out\n", __func__);

	if (data->phy_type == TSI108_PHY_BCM54XX) {
		tsi108_write_mii(data, 0x09, 0x0300);
		tsi108_write_mii(data, 0x10, 0x1020);
		tsi108_write_mii(data, 0x1c, 0x8c00);
	}

	tsi108_write_mii(data,
			 MII_BMCR,
			 BMCR_ANENABLE | BMCR_ANRESTART);
	while (tsi108_read_mii(data, MII_BMCR) & BMCR_ANRESTART)
		cpu_relax();

	/* Set G/MII mode and receive clock select in TBI control #2.  The
	 * second port won't work if this isn't done, even though we don't
	 * use TBI mode.
	 */

	tsi108_write_tbi(data, 0x11, 0x30);

	/* FIXME: It seems to take more than 2 back-to-back reads to the
	 * PHY_STAT register before the link up status bit is set.
	 */

	data->link_up = 0;

	while (!((phyval = tsi108_read_mii(data, MII_BMSR)) &
		 BMSR_LSTATUS)) {
		if (i++ > (MII_READ_DELAY / 10)) {
			break;
		}
		spin_unlock_irqrestore(&phy_lock, flags);
		msleep(10);
		spin_lock_irqsave(&phy_lock, flags);
	}

	data->mii_if.supports_gmii = mii_check_gmii_support(&data->mii_if);
	printk(KERN_DEBUG "PHY_STAT reg contains %08x\n", phyval);
	data->phy_ok = 1;
	data->init_media = 1;
	spin_unlock_irqrestore(&phy_lock, flags);
}

static void tsi108_kill_phy(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&phy_lock, flags);
	tsi108_write_mii(data, MII_BMCR, BMCR_PDOWN);
	data->phy_ok = 0;
	spin_unlock_irqrestore(&phy_lock, flags);
}

static int tsi108_open(struct net_device *dev)
{
	int i;
	struct tsi108_prv_data *data = netdev_priv(dev);
	unsigned int rxring_size = TSI108_RXRING_LEN * sizeof(rx_desc);
	unsigned int txring_size = TSI108_TXRING_LEN * sizeof(tx_desc);

	i = request_irq(data->irq_num, tsi108_irq, 0, dev->name, dev);
	if (i != 0) {
		printk(KERN_ERR "tsi108_eth%d: Could not allocate IRQ%d.\n",
		       data->id, data->irq_num);
		return i;
	} else {
		dev->irq = data->irq_num;
		printk(KERN_NOTICE
		       "tsi108_open : Port %d Assigned IRQ %d to %s\n",
		       data->id, dev->irq, dev->name);
	}

	data->rxring = dma_zalloc_coherent(NULL, rxring_size, &data->rxdma,
					   GFP_KERNEL);
	if (!data->rxring)
		return -ENOMEM;

	data->txring = dma_zalloc_coherent(NULL, txring_size, &data->txdma,
					   GFP_KERNEL);
	if (!data->txring) {
		pci_free_consistent(NULL, rxring_size, data->rxring,
				    data->rxdma);
		return -ENOMEM;
	}

	for (i = 0; i < TSI108_RXRING_LEN; i++) {
		data->rxring[i].next0 = data->rxdma + (i + 1) * sizeof(rx_desc);
		data->rxring[i].blen = TSI108_RXBUF_SIZE;
		data->rxring[i].vlan = 0;
	}

	data->rxring[TSI108_RXRING_LEN - 1].next0 = data->rxdma;

	data->rxtail = 0;
	data->rxhead = 0;

	for (i = 0; i < TSI108_RXRING_LEN; i++) {
		struct sk_buff *skb;

		skb = netdev_alloc_skb_ip_align(dev, TSI108_RXBUF_SIZE);
		if (!skb) {
			/* Bah.  No memory for now, but maybe we'll get
			 * some more later.
			 * For now, we'll live with the smaller ring.
			 */
			printk(KERN_WARNING
			       "%s: Could only allocate %d receive skb(s).\n",
			       dev->name, i);
			data->rxhead = i;
			break;
		}

		data->rxskbs[i] = skb;
		data->rxring[i].buf0 = virt_to_phys(data->rxskbs[i]->data);
		data->rxring[i].misc = TSI108_RX_OWN | TSI108_RX_INT;
	}

	data->rxfree = i;
	TSI_WRITE(TSI108_EC_RXQ_PTRLOW, data->rxdma);

	for (i = 0; i < TSI108_TXRING_LEN; i++) {
		data->txring[i].next0 = data->txdma + (i + 1) * sizeof(tx_desc);
		data->txring[i].misc = 0;
	}

	data->txring[TSI108_TXRING_LEN - 1].next0 = data->txdma;
	data->txtail = 0;
	data->txhead = 0;
	data->txfree = TSI108_TXRING_LEN;
	TSI_WRITE(TSI108_EC_TXQ_PTRLOW, data->txdma);
	tsi108_init_phy(dev);

	napi_enable(&data->napi);

	timer_setup(&data->timer, tsi108_timed_checker, 0);
	mod_timer(&data->timer, jiffies + 1);

	tsi108_restart_rx(data, dev);

	TSI_WRITE(TSI108_EC_INTSTAT, ~0);

	TSI_WRITE(TSI108_EC_INTMASK,
			     ~(TSI108_INT_TXQUEUE0 | TSI108_INT_RXERROR |
			       TSI108_INT_RXTHRESH | TSI108_INT_RXQUEUE0 |
			       TSI108_INT_RXOVERRUN | TSI108_INT_RXWAIT |
			       TSI108_INT_SFN | TSI108_INT_STATCARRY));

	TSI_WRITE(TSI108_MAC_CFG1,
			     TSI108_MAC_CFG1_RXEN | TSI108_MAC_CFG1_TXEN);
	netif_start_queue(dev);
	return 0;
}

static int tsi108_close(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);

	netif_stop_queue(dev);
	napi_disable(&data->napi);

	del_timer_sync(&data->timer);

	tsi108_stop_ethernet(dev);
	tsi108_kill_phy(dev);
	TSI_WRITE(TSI108_EC_INTMASK, ~0);
	TSI_WRITE(TSI108_MAC_CFG1, 0);

	/* Check for any pending TX packets, and drop them. */

	while (!data->txfree || data->txhead != data->txtail) {
		int tx = data->txtail;
		struct sk_buff *skb;
		skb = data->txskbs[tx];
		data->txtail = (data->txtail + 1) % TSI108_TXRING_LEN;
		data->txfree++;
		dev_kfree_skb(skb);
	}

	free_irq(data->irq_num, dev);

	/* Discard the RX ring. */

	while (data->rxfree) {
		int rx = data->rxtail;
		struct sk_buff *skb;

		skb = data->rxskbs[rx];
		data->rxtail = (data->rxtail + 1) % TSI108_RXRING_LEN;
		data->rxfree--;
		dev_kfree_skb(skb);
	}

	dma_free_coherent(0,
			    TSI108_RXRING_LEN * sizeof(rx_desc),
			    data->rxring, data->rxdma);
	dma_free_coherent(0,
			    TSI108_TXRING_LEN * sizeof(tx_desc),
			    data->txring, data->txdma);

	return 0;
}

static void tsi108_init_mac(struct net_device *dev)
{
	struct tsi108_prv_data *data = netdev_priv(dev);

	TSI_WRITE(TSI108_MAC_CFG2, TSI108_MAC_CFG2_DFLT_PREAMBLE |
			     TSI108_MAC_CFG2_PADCRC);

	TSI_WRITE(TSI108_EC_TXTHRESH,
			     (192 << TSI108_EC_TXTHRESH_STARTFILL) |
			     (192 << TSI108_EC_TXTHRESH_STOPFILL));

	TSI_WRITE(TSI108_STAT_CARRYMASK1,
			     ~(TSI108_STAT_CARRY1_RXBYTES |
			       TSI108_STAT_CARRY1_RXPKTS |
			       TSI108_STAT_CARRY1_RXFCS |
			       TSI108_STAT_CARRY1_RXMCAST |
			       TSI108_STAT_CARRY1_RXALIGN |
			       TSI108_STAT_CARRY1_RXLENGTH |
			       TSI108_STAT_CARRY1_RXRUNT |
			       TSI108_STAT_CARRY1_RXJUMBO |
			       TSI108_STAT_CARRY1_RXFRAG |
			       TSI108_STAT_CARRY1_RXJABBER |
			       TSI108_STAT_CARRY1_RXDROP));

	TSI_WRITE(TSI108_STAT_CARRYMASK2,
			     ~(TSI108_STAT_CARRY2_TXBYTES |
			       TSI108_STAT_CARRY2_TXPKTS |
			       TSI108_STAT_CARRY2_TXEXDEF |
			       TSI108_STAT_CARRY2_TXEXCOL |
			       TSI108_STAT_CARRY2_TXTCOL |
			       TSI108_STAT_CARRY2_TXPAUSE));

	TSI_WRITE(TSI108_EC_PORTCTRL, TSI108_EC_PORTCTRL_STATEN);
	TSI_WRITE(TSI108_MAC_CFG1, 0);

	TSI_WRITE(TSI108_EC_RXCFG,
			     TSI108_EC_RXCFG_SE | TSI108_EC_RXCFG_BFE);

	TSI_WRITE(TSI108_EC_TXQ_CFG, TSI108_EC_TXQ_CFG_DESC_INT |
			     TSI108_EC_TXQ_CFG_EOQ_OWN_INT |
			     TSI108_EC_TXQ_CFG_WSWP | (TSI108_PBM_PORT <<
						TSI108_EC_TXQ_CFG_SFNPORT));

	TSI_WRITE(TSI108_EC_RXQ_CFG, TSI108_EC_RXQ_CFG_DESC_INT |
			     TSI108_EC_RXQ_CFG_EOQ_OWN_INT |
			     TSI108_EC_RXQ_CFG_WSWP | (TSI108_PBM_PORT <<
						TSI108_EC_RXQ_CFG_SFNPORT));

	TSI_WRITE(TSI108_EC_TXQ_BUFCFG,
			     TSI108_EC_TXQ_BUFCFG_BURST256 |
			     TSI108_EC_TXQ_BUFCFG_BSWP | (TSI108_PBM_PORT <<
						TSI108_EC_TXQ_BUFCFG_SFNPORT));

	TSI_WRITE(TSI108_EC_RXQ_BUFCFG,
			     TSI108_EC_RXQ_BUFCFG_BURST256 |
			     TSI108_EC_RXQ_BUFCFG_BSWP | (TSI108_PBM_PORT <<
						TSI108_EC_RXQ_BUFCFG_SFNPORT));

	TSI_WRITE(TSI108_EC_INTMASK, ~0);
}

static int tsi108_get_link_ksettings(struct net_device *dev,
				     struct ethtool_link_ksettings *cmd)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&data->txlock, flags);
	mii_ethtool_get_link_ksettings(&data->mii_if, cmd);
	spin_unlock_irqrestore(&data->txlock, flags);

	return 0;
}

static int tsi108_set_link_ksettings(struct net_device *dev,
				     const struct ethtool_link_ksettings *cmd)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	unsigned long flags;
	int rc;

	spin_lock_irqsave(&data->txlock, flags);
	rc = mii_ethtool_set_link_ksettings(&data->mii_if, cmd);
	spin_unlock_irqrestore(&data->txlock, flags);

	return rc;
}

static int tsi108_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct tsi108_prv_data *data = netdev_priv(dev);
	if (!netif_running(dev))
		return -EINVAL;
	return generic_mii_ioctl(&data->mii_if, if_mii(rq), cmd, NULL);
}

static const struct ethtool_ops tsi108_ethtool_ops = {
	.get_link 	= ethtool_op_get_link,
	.get_link_ksettings	= tsi108_get_link_ksettings,
	.set_link_ksettings	= tsi108_set_link_ksettings,
};

static const struct net_device_ops tsi108_netdev_ops = {
	.ndo_open		= tsi108_open,
	.ndo_stop		= tsi108_close,
	.ndo_start_xmit		= tsi108_send_packet,
	.ndo_set_rx_mode	= tsi108_set_rx_mode,
	.ndo_get_stats		= tsi108_get_stats,
	.ndo_do_ioctl		= tsi108_do_ioctl,
	.ndo_set_mac_address	= tsi108_set_mac,
	.ndo_validate_addr	= eth_validate_addr,
};

static int
tsi108_init_one(struct platform_device *pdev)
{
	struct net_device *dev = NULL;
	struct tsi108_prv_data *data = NULL;
	hw_info *einfo;
	int err = 0;

	einfo = dev_get_platdata(&pdev->dev);

	if (NULL == einfo) {
		printk(KERN_ERR "tsi-eth %d: Missing additional data!\n",
		       pdev->id);
		return -ENODEV;
	}

	/* Create an ethernet device instance */

	dev = alloc_etherdev(sizeof(struct tsi108_prv_data));
	if (!dev)
		return -ENOMEM;

	printk("tsi108_eth%d: probe...\n", pdev->id);
	data = netdev_priv(dev);
	data->dev = dev;

	pr_debug("tsi108_eth%d:regs:phyresgs:phy:irq_num=0x%x:0x%x:0x%x:0x%x\n",
			pdev->id, einfo->regs, einfo->phyregs,
			einfo->phy, einfo->irq_num);

	data->regs = ioremap(einfo->regs, 0x400);
	if (NULL == data->regs) {
		err = -ENOMEM;
		goto regs_fail;
	}

	data->phyregs = ioremap(einfo->phyregs, 0x400);
	if (NULL == data->phyregs) {
		err = -ENOMEM;
		goto phyregs_fail;
	}
/* MII setup */
	data->mii_if.dev = dev;
	data->mii_if.mdio_read = tsi108_mdio_read;
	data->mii_if.mdio_write = tsi108_mdio_write;
	data->mii_if.phy_id = einfo->phy;
	data->mii_if.phy_id_mask = 0x1f;
	data->mii_if.reg_num_mask = 0x1f;

	data->phy = einfo->phy;
	data->phy_type = einfo->phy_type;
	data->irq_num = einfo->irq_num;
	data->id = pdev->id;
	netif_napi_add(dev, &data->napi, tsi108_poll, 64);
	dev->netdev_ops = &tsi108_netdev_ops;
	dev->ethtool_ops = &tsi108_ethtool_ops;

	/* Apparently, the Linux networking code won't use scatter-gather
	 * if the hardware doesn't do checksums.  However, it's faster
	 * to checksum in place and use SG, as (among other reasons)
	 * the cache won't be dirtied (which then has to be flushed
	 * before DMA).  The checksumming is done by the driver (via
	 * a new function skb_csum_dev() in net/core/skbuff.c).
	 */

	dev->features = NETIF_F_HIGHDMA;

	spin_lock_init(&data->txlock);
	spin_lock_init(&data->misclock);

	tsi108_reset_ether(data);
	tsi108_kill_phy(dev);

	if ((err = tsi108_get_mac(dev)) != 0) {
		printk(KERN_ERR "%s: Invalid MAC address.  Please correct.\n",
		       dev->name);
		goto register_fail;
	}

	tsi108_init_mac(dev);
	err = register_netdev(dev);
	if (err) {
		printk(KERN_ERR "%s: Cannot register net device, aborting.\n",
				dev->name);
		goto register_fail;
	}

	platform_set_drvdata(pdev, dev);
	printk(KERN_INFO "%s: Tsi108 Gigabit Ethernet, MAC: %pM\n",
	       dev->name, dev->dev_addr);
#ifdef DEBUG
	data->msg_enable = DEBUG;
	dump_eth_one(dev);
#endif

	return 0;

register_fail:
	iounmap(data->phyregs);

phyregs_fail:
	iounmap(data->regs);

regs_fail:
	free_netdev(dev);
	return err;
}

/* There's no way to either get interrupts from the PHY when
 * something changes, or to have the Tsi108 automatically communicate
 * with the PHY to reconfigure itself.
 *
 * Thus, we have to do it using a timer.
 */

static void tsi108_timed_checker(struct timer_list *t)
{
	struct tsi108_prv_data *data = from_timer(data, t, timer);
	struct net_device *dev = data->dev;

	tsi108_check_phy(dev);
	tsi108_check_rxring(dev);
	mod_timer(&data->timer, jiffies + CHECK_PHY_INTERVAL);
}

static int tsi108_ether_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);
	struct tsi108_prv_data *priv = netdev_priv(dev);

	unregister_netdev(dev);
	tsi108_stop_ethernet(dev);
	iounmap(priv->regs);
	iounmap(priv->phyregs);
	free_netdev(dev);

	return 0;
}
module_platform_driver(tsi_eth_driver);

MODULE_AUTHOR("Tundra Semiconductor Corporation");
MODULE_DESCRIPTION("Tsi108 Gigabit Ethernet driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:tsi-ethernet");