summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/toshiba/ps3_gelic_net.c
blob: 88d74aef218a2b7480a1e84f61ea9f8f63ad3e49 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
/*
 *  PS3 gelic network driver.
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2006, 2007 Sony Corporation
 *
 * This file is based on: spider_net.c
 *
 * (C) Copyright IBM Corp. 2005
 *
 * Authors : Utz Bacher <utz.bacher@de.ibm.com>
 *           Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
 *
 * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#undef DEBUG

#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>

#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>

#include <linux/dma-mapping.h>
#include <net/checksum.h>
#include <asm/firmware.h>
#include <asm/ps3.h>
#include <asm/lv1call.h>

#include "ps3_gelic_net.h"
#include "ps3_gelic_wireless.h"

#define DRV_NAME "Gelic Network Driver"
#define DRV_VERSION "2.0"

MODULE_AUTHOR("SCE Inc.");
MODULE_DESCRIPTION("Gelic Network driver");
MODULE_LICENSE("GPL");


/* set irq_mask */
int gelic_card_set_irq_mask(struct gelic_card *card, u64 mask)
{
	int status;

	status = lv1_net_set_interrupt_mask(bus_id(card), dev_id(card),
					    mask, 0);
	if (status)
		dev_info(ctodev(card),
			 "%s failed %d\n", __func__, status);
	return status;
}

static void gelic_card_rx_irq_on(struct gelic_card *card)
{
	card->irq_mask |= GELIC_CARD_RXINT;
	gelic_card_set_irq_mask(card, card->irq_mask);
}
static void gelic_card_rx_irq_off(struct gelic_card *card)
{
	card->irq_mask &= ~GELIC_CARD_RXINT;
	gelic_card_set_irq_mask(card, card->irq_mask);
}

static void gelic_card_get_ether_port_status(struct gelic_card *card,
					     int inform)
{
	u64 v2;
	struct net_device *ether_netdev;

	lv1_net_control(bus_id(card), dev_id(card),
			GELIC_LV1_GET_ETH_PORT_STATUS,
			GELIC_LV1_VLAN_TX_ETHERNET_0, 0, 0,
			&card->ether_port_status, &v2);

	if (inform) {
		ether_netdev = card->netdev[GELIC_PORT_ETHERNET_0];
		if (card->ether_port_status & GELIC_LV1_ETHER_LINK_UP)
			netif_carrier_on(ether_netdev);
		else
			netif_carrier_off(ether_netdev);
	}
}

/**
 * gelic_descr_get_status -- returns the status of a descriptor
 * @descr: descriptor to look at
 *
 * returns the status as in the dmac_cmd_status field of the descriptor
 */
static enum gelic_descr_dma_status
gelic_descr_get_status(struct gelic_descr *descr)
{
	return be32_to_cpu(descr->dmac_cmd_status) & GELIC_DESCR_DMA_STAT_MASK;
}

static int gelic_card_set_link_mode(struct gelic_card *card, int mode)
{
	int status;
	u64 v1, v2;

	status = lv1_net_control(bus_id(card), dev_id(card),
				 GELIC_LV1_SET_NEGOTIATION_MODE,
				 GELIC_LV1_PHY_ETHERNET_0, mode, 0, &v1, &v2);
	if (status) {
		pr_info("%s: failed setting negotiation mode %d\n", __func__,
			status);
		return -EBUSY;
	}

	card->link_mode = mode;
	return 0;
}

/**
 * gelic_card_disable_txdmac - disables the transmit DMA controller
 * @card: card structure
 *
 * gelic_card_disable_txdmac terminates processing on the DMA controller by
 * turing off DMA and issuing a force end
 */
static void gelic_card_disable_txdmac(struct gelic_card *card)
{
	int status;

	/* this hvc blocks until the DMA in progress really stopped */
	status = lv1_net_stop_tx_dma(bus_id(card), dev_id(card));
	if (status)
		dev_err(ctodev(card),
			"lv1_net_stop_tx_dma failed, status=%d\n", status);
}

/**
 * gelic_card_enable_rxdmac - enables the receive DMA controller
 * @card: card structure
 *
 * gelic_card_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
 * in the GDADMACCNTR register
 */
static void gelic_card_enable_rxdmac(struct gelic_card *card)
{
	int status;

#ifdef DEBUG
	if (gelic_descr_get_status(card->rx_chain.head) !=
	    GELIC_DESCR_DMA_CARDOWNED) {
		printk(KERN_ERR "%s: status=%x\n", __func__,
		       be32_to_cpu(card->rx_chain.head->dmac_cmd_status));
		printk(KERN_ERR "%s: nextphy=%x\n", __func__,
		       be32_to_cpu(card->rx_chain.head->next_descr_addr));
		printk(KERN_ERR "%s: head=%p\n", __func__,
		       card->rx_chain.head);
	}
#endif
	status = lv1_net_start_rx_dma(bus_id(card), dev_id(card),
				card->rx_chain.head->bus_addr, 0);
	if (status)
		dev_info(ctodev(card),
			 "lv1_net_start_rx_dma failed, status=%d\n", status);
}

/**
 * gelic_card_disable_rxdmac - disables the receive DMA controller
 * @card: card structure
 *
 * gelic_card_disable_rxdmac terminates processing on the DMA controller by
 * turing off DMA and issuing a force end
 */
static void gelic_card_disable_rxdmac(struct gelic_card *card)
{
	int status;

	/* this hvc blocks until the DMA in progress really stopped */
	status = lv1_net_stop_rx_dma(bus_id(card), dev_id(card));
	if (status)
		dev_err(ctodev(card),
			"lv1_net_stop_rx_dma failed, %d\n", status);
}

/**
 * gelic_descr_set_status -- sets the status of a descriptor
 * @descr: descriptor to change
 * @status: status to set in the descriptor
 *
 * changes the status to the specified value. Doesn't change other bits
 * in the status
 */
static void gelic_descr_set_status(struct gelic_descr *descr,
				   enum gelic_descr_dma_status status)
{
	descr->dmac_cmd_status = cpu_to_be32(status |
			(be32_to_cpu(descr->dmac_cmd_status) &
			 ~GELIC_DESCR_DMA_STAT_MASK));
	/*
	 * dma_cmd_status field is used to indicate whether the descriptor
	 * is valid or not.
	 * Usually caller of this function wants to inform that to the
	 * hardware, so we assure here the hardware sees the change.
	 */
	wmb();
}

/**
 * gelic_card_reset_chain - reset status of a descriptor chain
 * @card: card structure
 * @chain: address of chain
 * @start_descr: address of descriptor array
 *
 * Reset the status of dma descriptors to ready state
 * and re-initialize the hardware chain for later use
 */
static void gelic_card_reset_chain(struct gelic_card *card,
				   struct gelic_descr_chain *chain,
				   struct gelic_descr *start_descr)
{
	struct gelic_descr *descr;

	for (descr = start_descr; start_descr != descr->next; descr++) {
		gelic_descr_set_status(descr, GELIC_DESCR_DMA_CARDOWNED);
		descr->next_descr_addr = cpu_to_be32(descr->next->bus_addr);
	}

	chain->head = start_descr;
	chain->tail = (descr - 1);

	(descr - 1)->next_descr_addr = 0;
}

void gelic_card_up(struct gelic_card *card)
{
	pr_debug("%s: called\n", __func__);
	mutex_lock(&card->updown_lock);
	if (atomic_inc_return(&card->users) == 1) {
		pr_debug("%s: real do\n", __func__);
		/* enable irq */
		gelic_card_set_irq_mask(card, card->irq_mask);
		/* start rx */
		gelic_card_enable_rxdmac(card);

		napi_enable(&card->napi);
	}
	mutex_unlock(&card->updown_lock);
	pr_debug("%s: done\n", __func__);
}

void gelic_card_down(struct gelic_card *card)
{
	u64 mask;
	pr_debug("%s: called\n", __func__);
	mutex_lock(&card->updown_lock);
	if (atomic_dec_if_positive(&card->users) == 0) {
		pr_debug("%s: real do\n", __func__);
		napi_disable(&card->napi);
		/*
		 * Disable irq. Wireless interrupts will
		 * be disabled later if any
		 */
		mask = card->irq_mask & (GELIC_CARD_WLAN_EVENT_RECEIVED |
					 GELIC_CARD_WLAN_COMMAND_COMPLETED);
		gelic_card_set_irq_mask(card, mask);
		/* stop rx */
		gelic_card_disable_rxdmac(card);
		gelic_card_reset_chain(card, &card->rx_chain,
				       card->descr + GELIC_NET_TX_DESCRIPTORS);
		/* stop tx */
		gelic_card_disable_txdmac(card);
	}
	mutex_unlock(&card->updown_lock);
	pr_debug("%s: done\n", __func__);
}

/**
 * gelic_card_free_chain - free descriptor chain
 * @card: card structure
 * @descr_in: address of desc
 */
static void gelic_card_free_chain(struct gelic_card *card,
				  struct gelic_descr *descr_in)
{
	struct gelic_descr *descr;

	for (descr = descr_in; descr && descr->bus_addr; descr = descr->next) {
		dma_unmap_single(ctodev(card), descr->bus_addr,
				 GELIC_DESCR_SIZE, DMA_BIDIRECTIONAL);
		descr->bus_addr = 0;
	}
}

/**
 * gelic_card_init_chain - links descriptor chain
 * @card: card structure
 * @chain: address of chain
 * @start_descr: address of descriptor array
 * @no: number of descriptors
 *
 * we manage a circular list that mirrors the hardware structure,
 * except that the hardware uses bus addresses.
 *
 * returns 0 on success, <0 on failure
 */
static int gelic_card_init_chain(struct gelic_card *card,
				 struct gelic_descr_chain *chain,
				 struct gelic_descr *start_descr, int no)
{
	int i;
	struct gelic_descr *descr;

	descr = start_descr;
	memset(descr, 0, sizeof(*descr) * no);

	/* set up the hardware pointers in each descriptor */
	for (i = 0; i < no; i++, descr++) {
		gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);
		descr->bus_addr =
			dma_map_single(ctodev(card), descr,
				       GELIC_DESCR_SIZE,
				       DMA_BIDIRECTIONAL);

		if (!descr->bus_addr)
			goto iommu_error;

		descr->next = descr + 1;
		descr->prev = descr - 1;
	}
	/* make them as ring */
	(descr - 1)->next = start_descr;
	start_descr->prev = (descr - 1);

	/* chain bus addr of hw descriptor */
	descr = start_descr;
	for (i = 0; i < no; i++, descr++) {
		descr->next_descr_addr = cpu_to_be32(descr->next->bus_addr);
	}

	chain->head = start_descr;
	chain->tail = start_descr;

	/* do not chain last hw descriptor */
	(descr - 1)->next_descr_addr = 0;

	return 0;

iommu_error:
	for (i--, descr--; 0 <= i; i--, descr--)
		if (descr->bus_addr)
			dma_unmap_single(ctodev(card), descr->bus_addr,
					 GELIC_DESCR_SIZE,
					 DMA_BIDIRECTIONAL);
	return -ENOMEM;
}

/**
 * gelic_descr_prepare_rx - reinitializes a rx descriptor
 * @card: card structure
 * @descr: descriptor to re-init
 *
 * return 0 on success, <0 on failure
 *
 * allocates a new rx skb, iommu-maps it and attaches it to the descriptor.
 * Activate the descriptor state-wise
 */
static int gelic_descr_prepare_rx(struct gelic_card *card,
				  struct gelic_descr *descr)
{
	int offset;
	unsigned int bufsize;

	if (gelic_descr_get_status(descr) !=  GELIC_DESCR_DMA_NOT_IN_USE)
		dev_info(ctodev(card), "%s: ERROR status\n", __func__);
	/* we need to round up the buffer size to a multiple of 128 */
	bufsize = ALIGN(GELIC_NET_MAX_MTU, GELIC_NET_RXBUF_ALIGN);

	/* and we need to have it 128 byte aligned, therefore we allocate a
	 * bit more */
	descr->skb = dev_alloc_skb(bufsize + GELIC_NET_RXBUF_ALIGN - 1);
	if (!descr->skb) {
		descr->buf_addr = 0; /* tell DMAC don't touch memory */
		dev_info(ctodev(card),
			 "%s:allocate skb failed !!\n", __func__);
		return -ENOMEM;
	}
	descr->buf_size = cpu_to_be32(bufsize);
	descr->dmac_cmd_status = 0;
	descr->result_size = 0;
	descr->valid_size = 0;
	descr->data_error = 0;

	offset = ((unsigned long)descr->skb->data) &
		(GELIC_NET_RXBUF_ALIGN - 1);
	if (offset)
		skb_reserve(descr->skb, GELIC_NET_RXBUF_ALIGN - offset);
	/* io-mmu-map the skb */
	descr->buf_addr = cpu_to_be32(dma_map_single(ctodev(card),
						     descr->skb->data,
						     GELIC_NET_MAX_MTU,
						     DMA_FROM_DEVICE));
	if (!descr->buf_addr) {
		dev_kfree_skb_any(descr->skb);
		descr->skb = NULL;
		dev_info(ctodev(card),
			 "%s:Could not iommu-map rx buffer\n", __func__);
		gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);
		return -ENOMEM;
	} else {
		gelic_descr_set_status(descr, GELIC_DESCR_DMA_CARDOWNED);
		return 0;
	}
}

/**
 * gelic_card_release_rx_chain - free all skb of rx descr
 * @card: card structure
 *
 */
static void gelic_card_release_rx_chain(struct gelic_card *card)
{
	struct gelic_descr *descr = card->rx_chain.head;

	do {
		if (descr->skb) {
			dma_unmap_single(ctodev(card),
					 be32_to_cpu(descr->buf_addr),
					 descr->skb->len,
					 DMA_FROM_DEVICE);
			descr->buf_addr = 0;
			dev_kfree_skb_any(descr->skb);
			descr->skb = NULL;
			gelic_descr_set_status(descr,
					       GELIC_DESCR_DMA_NOT_IN_USE);
		}
		descr = descr->next;
	} while (descr != card->rx_chain.head);
}

/**
 * gelic_card_fill_rx_chain - fills descriptors/skbs in the rx chains
 * @card: card structure
 *
 * fills all descriptors in the rx chain: allocates skbs
 * and iommu-maps them.
 * returns 0 on success, < 0 on failure
 */
static int gelic_card_fill_rx_chain(struct gelic_card *card)
{
	struct gelic_descr *descr = card->rx_chain.head;
	int ret;

	do {
		if (!descr->skb) {
			ret = gelic_descr_prepare_rx(card, descr);
			if (ret)
				goto rewind;
		}
		descr = descr->next;
	} while (descr != card->rx_chain.head);

	return 0;
rewind:
	gelic_card_release_rx_chain(card);
	return ret;
}

/**
 * gelic_card_alloc_rx_skbs - allocates rx skbs in rx descriptor chains
 * @card: card structure
 *
 * returns 0 on success, < 0 on failure
 */
static int gelic_card_alloc_rx_skbs(struct gelic_card *card)
{
	struct gelic_descr_chain *chain;
	int ret;
	chain = &card->rx_chain;
	ret = gelic_card_fill_rx_chain(card);
	chain->tail = card->rx_top->prev; /* point to the last */
	return ret;
}

/**
 * gelic_descr_release_tx - processes a used tx descriptor
 * @card: card structure
 * @descr: descriptor to release
 *
 * releases a used tx descriptor (unmapping, freeing of skb)
 */
static void gelic_descr_release_tx(struct gelic_card *card,
				       struct gelic_descr *descr)
{
	struct sk_buff *skb = descr->skb;

	BUG_ON(!(be32_to_cpu(descr->data_status) & GELIC_DESCR_TX_TAIL));

	dma_unmap_single(ctodev(card), be32_to_cpu(descr->buf_addr), skb->len,
			 DMA_TO_DEVICE);
	dev_kfree_skb_any(skb);

	descr->buf_addr = 0;
	descr->buf_size = 0;
	descr->next_descr_addr = 0;
	descr->result_size = 0;
	descr->valid_size = 0;
	descr->data_status = 0;
	descr->data_error = 0;
	descr->skb = NULL;

	/* set descr status */
	gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);
}

static void gelic_card_stop_queues(struct gelic_card *card)
{
	netif_stop_queue(card->netdev[GELIC_PORT_ETHERNET_0]);

	if (card->netdev[GELIC_PORT_WIRELESS])
		netif_stop_queue(card->netdev[GELIC_PORT_WIRELESS]);
}
static void gelic_card_wake_queues(struct gelic_card *card)
{
	netif_wake_queue(card->netdev[GELIC_PORT_ETHERNET_0]);

	if (card->netdev[GELIC_PORT_WIRELESS])
		netif_wake_queue(card->netdev[GELIC_PORT_WIRELESS]);
}
/**
 * gelic_card_release_tx_chain - processes sent tx descriptors
 * @card: adapter structure
 * @stop: net_stop sequence
 *
 * releases the tx descriptors that gelic has finished with
 */
static void gelic_card_release_tx_chain(struct gelic_card *card, int stop)
{
	struct gelic_descr_chain *tx_chain;
	enum gelic_descr_dma_status status;
	struct net_device *netdev;
	int release = 0;

	for (tx_chain = &card->tx_chain;
	     tx_chain->head != tx_chain->tail && tx_chain->tail;
	     tx_chain->tail = tx_chain->tail->next) {
		status = gelic_descr_get_status(tx_chain->tail);
		netdev = tx_chain->tail->skb->dev;
		switch (status) {
		case GELIC_DESCR_DMA_RESPONSE_ERROR:
		case GELIC_DESCR_DMA_PROTECTION_ERROR:
		case GELIC_DESCR_DMA_FORCE_END:
			if (printk_ratelimit())
				dev_info(ctodev(card),
					 "%s: forcing end of tx descriptor " \
					 "with status %x\n",
					 __func__, status);
			netdev->stats.tx_dropped++;
			break;

		case GELIC_DESCR_DMA_COMPLETE:
			if (tx_chain->tail->skb) {
				netdev->stats.tx_packets++;
				netdev->stats.tx_bytes +=
					tx_chain->tail->skb->len;
			}
			break;

		case GELIC_DESCR_DMA_CARDOWNED:
			/* pending tx request */
		default:
			/* any other value (== GELIC_DESCR_DMA_NOT_IN_USE) */
			if (!stop)
				goto out;
		}
		gelic_descr_release_tx(card, tx_chain->tail);
		release ++;
	}
out:
	if (!stop && release)
		gelic_card_wake_queues(card);
}

/**
 * gelic_net_set_multi - sets multicast addresses and promisc flags
 * @netdev: interface device structure
 *
 * gelic_net_set_multi configures multicast addresses as needed for the
 * netdev interface. It also sets up multicast, allmulti and promisc
 * flags appropriately
 */
void gelic_net_set_multi(struct net_device *netdev)
{
	struct gelic_card *card = netdev_card(netdev);
	struct netdev_hw_addr *ha;
	unsigned int i;
	uint8_t *p;
	u64 addr;
	int status;

	/* clear all multicast address */
	status = lv1_net_remove_multicast_address(bus_id(card), dev_id(card),
						  0, 1);
	if (status)
		dev_err(ctodev(card),
			"lv1_net_remove_multicast_address failed %d\n",
			status);
	/* set broadcast address */
	status = lv1_net_add_multicast_address(bus_id(card), dev_id(card),
					       GELIC_NET_BROADCAST_ADDR, 0);
	if (status)
		dev_err(ctodev(card),
			"lv1_net_add_multicast_address failed, %d\n",
			status);

	if ((netdev->flags & IFF_ALLMULTI) ||
	    (netdev_mc_count(netdev) > GELIC_NET_MC_COUNT_MAX)) {
		status = lv1_net_add_multicast_address(bus_id(card),
						       dev_id(card),
						       0, 1);
		if (status)
			dev_err(ctodev(card),
				"lv1_net_add_multicast_address failed, %d\n",
				status);
		return;
	}

	/* set multicast addresses */
	netdev_for_each_mc_addr(ha, netdev) {
		addr = 0;
		p = ha->addr;
		for (i = 0; i < ETH_ALEN; i++) {
			addr <<= 8;
			addr |= *p++;
		}
		status = lv1_net_add_multicast_address(bus_id(card),
						       dev_id(card),
						       addr, 0);
		if (status)
			dev_err(ctodev(card),
				"lv1_net_add_multicast_address failed, %d\n",
				status);
	}
}

/**
 * gelic_net_stop - called upon ifconfig down
 * @netdev: interface device structure
 *
 * always returns 0
 */
int gelic_net_stop(struct net_device *netdev)
{
	struct gelic_card *card;

	pr_debug("%s: start\n", __func__);

	netif_stop_queue(netdev);
	netif_carrier_off(netdev);

	card = netdev_card(netdev);
	gelic_card_down(card);

	pr_debug("%s: done\n", __func__);
	return 0;
}

/**
 * gelic_card_get_next_tx_descr - returns the next available tx descriptor
 * @card: device structure to get descriptor from
 *
 * returns the address of the next descriptor, or NULL if not available.
 */
static struct gelic_descr *
gelic_card_get_next_tx_descr(struct gelic_card *card)
{
	if (!card->tx_chain.head)
		return NULL;
	/*  see if the next descriptor is free */
	if (card->tx_chain.tail != card->tx_chain.head->next &&
	    gelic_descr_get_status(card->tx_chain.head) ==
	    GELIC_DESCR_DMA_NOT_IN_USE)
		return card->tx_chain.head;
	else
		return NULL;

}

/**
 * gelic_net_set_txdescr_cmdstat - sets the tx descriptor command field
 * @descr: descriptor structure to fill out
 * @skb: packet to consider
 *
 * fills out the command and status field of the descriptor structure,
 * depending on hardware checksum settings. This function assumes a wmb()
 * has executed before.
 */
static void gelic_descr_set_tx_cmdstat(struct gelic_descr *descr,
				       struct sk_buff *skb)
{
	if (skb->ip_summed != CHECKSUM_PARTIAL)
		descr->dmac_cmd_status =
			cpu_to_be32(GELIC_DESCR_DMA_CMD_NO_CHKSUM |
				    GELIC_DESCR_TX_DMA_FRAME_TAIL);
	else {
		/* is packet ip?
		 * if yes: tcp? udp? */
		if (skb->protocol == htons(ETH_P_IP)) {
			if (ip_hdr(skb)->protocol == IPPROTO_TCP)
				descr->dmac_cmd_status =
				cpu_to_be32(GELIC_DESCR_DMA_CMD_TCP_CHKSUM |
					    GELIC_DESCR_TX_DMA_FRAME_TAIL);

			else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
				descr->dmac_cmd_status =
				cpu_to_be32(GELIC_DESCR_DMA_CMD_UDP_CHKSUM |
					    GELIC_DESCR_TX_DMA_FRAME_TAIL);
			else	/*
				 * the stack should checksum non-tcp and non-udp
				 * packets on his own: NETIF_F_IP_CSUM
				 */
				descr->dmac_cmd_status =
				cpu_to_be32(GELIC_DESCR_DMA_CMD_NO_CHKSUM |
					    GELIC_DESCR_TX_DMA_FRAME_TAIL);
		}
	}
}

static struct sk_buff *gelic_put_vlan_tag(struct sk_buff *skb,
						 unsigned short tag)
{
	struct vlan_ethhdr *veth;
	static unsigned int c;

	if (skb_headroom(skb) < VLAN_HLEN) {
		struct sk_buff *sk_tmp = skb;
		pr_debug("%s: hd=%d c=%ud\n", __func__, skb_headroom(skb), c);
		skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
		if (!skb)
			return NULL;
		dev_kfree_skb_any(sk_tmp);
	}
	veth = skb_push(skb, VLAN_HLEN);

	/* Move the mac addresses to the top of buffer */
	memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);

	veth->h_vlan_proto = cpu_to_be16(ETH_P_8021Q);
	veth->h_vlan_TCI = htons(tag);

	return skb;
}

/**
 * gelic_descr_prepare_tx - setup a descriptor for sending packets
 * @card: card structure
 * @descr: descriptor structure
 * @skb: packet to use
 *
 * returns 0 on success, <0 on failure.
 *
 */
static int gelic_descr_prepare_tx(struct gelic_card *card,
				  struct gelic_descr *descr,
				  struct sk_buff *skb)
{
	dma_addr_t buf;

	if (card->vlan_required) {
		struct sk_buff *skb_tmp;
		enum gelic_port_type type;

		type = netdev_port(skb->dev)->type;
		skb_tmp = gelic_put_vlan_tag(skb,
					     card->vlan[type].tx);
		if (!skb_tmp)
			return -ENOMEM;
		skb = skb_tmp;
	}

	buf = dma_map_single(ctodev(card), skb->data, skb->len, DMA_TO_DEVICE);

	if (!buf) {
		dev_err(ctodev(card),
			"dma map 2 failed (%p, %i). Dropping packet\n",
			skb->data, skb->len);
		return -ENOMEM;
	}

	descr->buf_addr = cpu_to_be32(buf);
	descr->buf_size = cpu_to_be32(skb->len);
	descr->skb = skb;
	descr->data_status = 0;
	descr->next_descr_addr = 0; /* terminate hw descr */
	gelic_descr_set_tx_cmdstat(descr, skb);

	/* bump free descriptor pointer */
	card->tx_chain.head = descr->next;
	return 0;
}

/**
 * gelic_card_kick_txdma - enables TX DMA processing
 * @card: card structure
 * @descr: descriptor address to enable TX processing at
 *
 */
static int gelic_card_kick_txdma(struct gelic_card *card,
				 struct gelic_descr *descr)
{
	int status = 0;

	if (card->tx_dma_progress)
		return 0;

	if (gelic_descr_get_status(descr) == GELIC_DESCR_DMA_CARDOWNED) {
		card->tx_dma_progress = 1;
		status = lv1_net_start_tx_dma(bus_id(card), dev_id(card),
					      descr->bus_addr, 0);
		if (status) {
			card->tx_dma_progress = 0;
			dev_info(ctodev(card), "lv1_net_start_txdma failed," \
				 "status=%d\n", status);
		}
	}
	return status;
}

/**
 * gelic_net_xmit - transmits a frame over the device
 * @skb: packet to send out
 * @netdev: interface device structure
 *
 * returns 0 on success, <0 on failure
 */
int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
{
	struct gelic_card *card = netdev_card(netdev);
	struct gelic_descr *descr;
	int result;
	unsigned long flags;

	spin_lock_irqsave(&card->tx_lock, flags);

	gelic_card_release_tx_chain(card, 0);

	descr = gelic_card_get_next_tx_descr(card);
	if (!descr) {
		/*
		 * no more descriptors free
		 */
		gelic_card_stop_queues(card);
		spin_unlock_irqrestore(&card->tx_lock, flags);
		return NETDEV_TX_BUSY;
	}

	result = gelic_descr_prepare_tx(card, descr, skb);
	if (result) {
		/*
		 * DMA map failed.  As chances are that failure
		 * would continue, just release skb and return
		 */
		netdev->stats.tx_dropped++;
		dev_kfree_skb_any(skb);
		spin_unlock_irqrestore(&card->tx_lock, flags);
		return NETDEV_TX_OK;
	}
	/*
	 * link this prepared descriptor to previous one
	 * to achieve high performance
	 */
	descr->prev->next_descr_addr = cpu_to_be32(descr->bus_addr);
	/*
	 * as hardware descriptor is modified in the above lines,
	 * ensure that the hardware sees it
	 */
	wmb();
	if (gelic_card_kick_txdma(card, descr)) {
		/*
		 * kick failed.
		 * release descriptor which was just prepared
		 */
		netdev->stats.tx_dropped++;
		/* don't trigger BUG_ON() in gelic_descr_release_tx */
		descr->data_status = cpu_to_be32(GELIC_DESCR_TX_TAIL);
		gelic_descr_release_tx(card, descr);
		/* reset head */
		card->tx_chain.head = descr;
		/* reset hw termination */
		descr->prev->next_descr_addr = 0;
		dev_info(ctodev(card), "%s: kick failure\n", __func__);
	}

	spin_unlock_irqrestore(&card->tx_lock, flags);
	return NETDEV_TX_OK;
}

/**
 * gelic_net_pass_skb_up - takes an skb from a descriptor and passes it on
 * @descr: descriptor to process
 * @card: card structure
 * @netdev: net_device structure to be passed packet
 *
 * iommu-unmaps the skb, fills out skb structure and passes the data to the
 * stack. The descriptor state is not changed.
 */
static void gelic_net_pass_skb_up(struct gelic_descr *descr,
				  struct gelic_card *card,
				  struct net_device *netdev)

{
	struct sk_buff *skb = descr->skb;
	u32 data_status, data_error;

	data_status = be32_to_cpu(descr->data_status);
	data_error = be32_to_cpu(descr->data_error);
	/* unmap skb buffer */
	dma_unmap_single(ctodev(card), be32_to_cpu(descr->buf_addr),
			 GELIC_NET_MAX_MTU,
			 DMA_FROM_DEVICE);

	skb_put(skb, be32_to_cpu(descr->valid_size)?
		be32_to_cpu(descr->valid_size) :
		be32_to_cpu(descr->result_size));
	if (!descr->valid_size)
		dev_info(ctodev(card), "buffer full %x %x %x\n",
			 be32_to_cpu(descr->result_size),
			 be32_to_cpu(descr->buf_size),
			 be32_to_cpu(descr->dmac_cmd_status));

	descr->skb = NULL;
	/*
	 * the card put 2 bytes vlan tag in front
	 * of the ethernet frame
	 */
	skb_pull(skb, 2);
	skb->protocol = eth_type_trans(skb, netdev);

	/* checksum offload */
	if (netdev->features & NETIF_F_RXCSUM) {
		if ((data_status & GELIC_DESCR_DATA_STATUS_CHK_MASK) &&
		    (!(data_error & GELIC_DESCR_DATA_ERROR_CHK_MASK)))
			skb->ip_summed = CHECKSUM_UNNECESSARY;
		else
			skb_checksum_none_assert(skb);
	} else
		skb_checksum_none_assert(skb);

	/* update netdevice statistics */
	netdev->stats.rx_packets++;
	netdev->stats.rx_bytes += skb->len;

	/* pass skb up to stack */
	netif_receive_skb(skb);
}

/**
 * gelic_card_decode_one_descr - processes an rx descriptor
 * @card: card structure
 *
 * returns 1 if a packet has been sent to the stack, otherwise 0
 *
 * processes an rx descriptor by iommu-unmapping the data buffer and passing
 * the packet up to the stack
 */
static int gelic_card_decode_one_descr(struct gelic_card *card)
{
	enum gelic_descr_dma_status status;
	struct gelic_descr_chain *chain = &card->rx_chain;
	struct gelic_descr *descr = chain->head;
	struct net_device *netdev = NULL;
	int dmac_chain_ended;

	status = gelic_descr_get_status(descr);

	if (status == GELIC_DESCR_DMA_CARDOWNED)
		return 0;

	if (status == GELIC_DESCR_DMA_NOT_IN_USE) {
		dev_dbg(ctodev(card), "dormant descr? %p\n", descr);
		return 0;
	}

	/* netdevice select */
	if (card->vlan_required) {
		unsigned int i;
		u16 vid;
		vid = *(u16 *)(descr->skb->data) & VLAN_VID_MASK;
		for (i = 0; i < GELIC_PORT_MAX; i++) {
			if (card->vlan[i].rx == vid) {
				netdev = card->netdev[i];
				break;
			}
		}
		if (GELIC_PORT_MAX <= i) {
			pr_info("%s: unknown packet vid=%x\n", __func__, vid);
			goto refill;
		}
	} else
		netdev = card->netdev[GELIC_PORT_ETHERNET_0];

	if ((status == GELIC_DESCR_DMA_RESPONSE_ERROR) ||
	    (status == GELIC_DESCR_DMA_PROTECTION_ERROR) ||
	    (status == GELIC_DESCR_DMA_FORCE_END)) {
		dev_info(ctodev(card), "dropping RX descriptor with state %x\n",
			 status);
		netdev->stats.rx_dropped++;
		goto refill;
	}

	if (status == GELIC_DESCR_DMA_BUFFER_FULL) {
		/*
		 * Buffer full would occur if and only if
		 * the frame length was longer than the size of this
		 * descriptor's buffer.  If the frame length was equal
		 * to or shorter than buffer'size, FRAME_END condition
		 * would occur.
		 * Anyway this frame was longer than the MTU,
		 * just drop it.
		 */
		dev_info(ctodev(card), "overlength frame\n");
		goto refill;
	}
	/*
	 * descriptors any other than FRAME_END here should
	 * be treated as error.
	 */
	if (status != GELIC_DESCR_DMA_FRAME_END) {
		dev_dbg(ctodev(card), "RX descriptor with state %x\n",
			status);
		goto refill;
	}

	/* ok, we've got a packet in descr */
	gelic_net_pass_skb_up(descr, card, netdev);
refill:

	/* is the current descriptor terminated with next_descr == NULL? */
	dmac_chain_ended =
		be32_to_cpu(descr->dmac_cmd_status) &
		GELIC_DESCR_RX_DMA_CHAIN_END;
	/*
	 * So that always DMAC can see the end
	 * of the descriptor chain to avoid
	 * from unwanted DMAC overrun.
	 */
	descr->next_descr_addr = 0;

	/* change the descriptor state: */
	gelic_descr_set_status(descr, GELIC_DESCR_DMA_NOT_IN_USE);

	/*
	 * this call can fail, but for now, just leave this
	 * descriptor without skb
	 */
	gelic_descr_prepare_rx(card, descr);

	chain->tail = descr;
	chain->head = descr->next;

	/*
	 * Set this descriptor the end of the chain.
	 */
	descr->prev->next_descr_addr = cpu_to_be32(descr->bus_addr);

	/*
	 * If dmac chain was met, DMAC stopped.
	 * thus re-enable it
	 */

	if (dmac_chain_ended)
		gelic_card_enable_rxdmac(card);

	return 1;
}

/**
 * gelic_net_poll - NAPI poll function called by the stack to return packets
 * @napi: napi structure
 * @budget: number of packets we can pass to the stack at most
 *
 * returns the number of the processed packets
 *
 */
static int gelic_net_poll(struct napi_struct *napi, int budget)
{
	struct gelic_card *card = container_of(napi, struct gelic_card, napi);
	int packets_done = 0;

	while (packets_done < budget) {
		if (!gelic_card_decode_one_descr(card))
			break;

		packets_done++;
	}

	if (packets_done < budget) {
		napi_complete_done(napi, packets_done);
		gelic_card_rx_irq_on(card);
	}
	return packets_done;
}

/**
 * gelic_card_interrupt - event handler for gelic_net
 */
static irqreturn_t gelic_card_interrupt(int irq, void *ptr)
{
	unsigned long flags;
	struct gelic_card *card = ptr;
	u64 status;

	status = card->irq_status;

	if (!status)
		return IRQ_NONE;

	status &= card->irq_mask;

	if (status & GELIC_CARD_RXINT) {
		gelic_card_rx_irq_off(card);
		napi_schedule(&card->napi);
	}

	if (status & GELIC_CARD_TXINT) {
		spin_lock_irqsave(&card->tx_lock, flags);
		card->tx_dma_progress = 0;
		gelic_card_release_tx_chain(card, 0);
		/* kick outstanding tx descriptor if any */
		gelic_card_kick_txdma(card, card->tx_chain.tail);
		spin_unlock_irqrestore(&card->tx_lock, flags);
	}

	/* ether port status changed */
	if (status & GELIC_CARD_PORT_STATUS_CHANGED)
		gelic_card_get_ether_port_status(card, 1);

#ifdef CONFIG_GELIC_WIRELESS
	if (status & (GELIC_CARD_WLAN_EVENT_RECEIVED |
		      GELIC_CARD_WLAN_COMMAND_COMPLETED))
		gelic_wl_interrupt(card->netdev[GELIC_PORT_WIRELESS], status);
#endif

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/**
 * gelic_net_poll_controller - artificial interrupt for netconsole etc.
 * @netdev: interface device structure
 *
 * see Documentation/networking/netconsole.txt
 */
void gelic_net_poll_controller(struct net_device *netdev)
{
	struct gelic_card *card = netdev_card(netdev);

	gelic_card_set_irq_mask(card, 0);
	gelic_card_interrupt(netdev->irq, netdev);
	gelic_card_set_irq_mask(card, card->irq_mask);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */

/**
 * gelic_net_open - called upon ifconfig up
 * @netdev: interface device structure
 *
 * returns 0 on success, <0 on failure
 *
 * gelic_net_open allocates all the descriptors and memory needed for
 * operation, sets up multicast list and enables interrupts
 */
int gelic_net_open(struct net_device *netdev)
{
	struct gelic_card *card = netdev_card(netdev);

	dev_dbg(ctodev(card), " -> %s %p\n", __func__, netdev);

	gelic_card_up(card);

	netif_start_queue(netdev);
	gelic_card_get_ether_port_status(card, 1);

	dev_dbg(ctodev(card), " <- %s\n", __func__);
	return 0;
}

void gelic_net_get_drvinfo(struct net_device *netdev,
			   struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
}

static int gelic_ether_get_link_ksettings(struct net_device *netdev,
					  struct ethtool_link_ksettings *cmd)
{
	struct gelic_card *card = netdev_card(netdev);
	u32 supported, advertising;

	gelic_card_get_ether_port_status(card, 0);

	if (card->ether_port_status & GELIC_LV1_ETHER_FULL_DUPLEX)
		cmd->base.duplex = DUPLEX_FULL;
	else
		cmd->base.duplex = DUPLEX_HALF;

	switch (card->ether_port_status & GELIC_LV1_ETHER_SPEED_MASK) {
	case GELIC_LV1_ETHER_SPEED_10:
		cmd->base.speed = SPEED_10;
		break;
	case GELIC_LV1_ETHER_SPEED_100:
		cmd->base.speed = SPEED_100;
		break;
	case GELIC_LV1_ETHER_SPEED_1000:
		cmd->base.speed = SPEED_1000;
		break;
	default:
		pr_info("%s: speed unknown\n", __func__);
		cmd->base.speed = SPEED_10;
		break;
	}

	supported = SUPPORTED_TP | SUPPORTED_Autoneg |
			SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
			SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
			SUPPORTED_1000baseT_Full;
	advertising = supported;
	if (card->link_mode & GELIC_LV1_ETHER_AUTO_NEG) {
		cmd->base.autoneg = AUTONEG_ENABLE;
	} else {
		cmd->base.autoneg = AUTONEG_DISABLE;
		advertising &= ~ADVERTISED_Autoneg;
	}
	cmd->base.port = PORT_TP;

	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
						supported);
	ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
						advertising);

	return 0;
}

static int
gelic_ether_set_link_ksettings(struct net_device *netdev,
			       const struct ethtool_link_ksettings *cmd)
{
	struct gelic_card *card = netdev_card(netdev);
	u64 mode;
	int ret;

	if (cmd->base.autoneg == AUTONEG_ENABLE) {
		mode = GELIC_LV1_ETHER_AUTO_NEG;
	} else {
		switch (cmd->base.speed) {
		case SPEED_10:
			mode = GELIC_LV1_ETHER_SPEED_10;
			break;
		case SPEED_100:
			mode = GELIC_LV1_ETHER_SPEED_100;
			break;
		case SPEED_1000:
			mode = GELIC_LV1_ETHER_SPEED_1000;
			break;
		default:
			return -EINVAL;
		}
		if (cmd->base.duplex == DUPLEX_FULL) {
			mode |= GELIC_LV1_ETHER_FULL_DUPLEX;
		} else if (cmd->base.speed == SPEED_1000) {
			pr_info("1000 half duplex is not supported.\n");
			return -EINVAL;
		}
	}

	ret = gelic_card_set_link_mode(card, mode);

	if (ret)
		return ret;

	return 0;
}

static void gelic_net_get_wol(struct net_device *netdev,
			      struct ethtool_wolinfo *wol)
{
	if (0 <= ps3_compare_firmware_version(2, 2, 0))
		wol->supported = WAKE_MAGIC;
	else
		wol->supported = 0;

	wol->wolopts = ps3_sys_manager_get_wol() ? wol->supported : 0;
	memset(&wol->sopass, 0, sizeof(wol->sopass));
}
static int gelic_net_set_wol(struct net_device *netdev,
			     struct ethtool_wolinfo *wol)
{
	int status;
	struct gelic_card *card;
	u64 v1, v2;

	if (ps3_compare_firmware_version(2, 2, 0) < 0 ||
	    !capable(CAP_NET_ADMIN))
		return -EPERM;

	if (wol->wolopts & ~WAKE_MAGIC)
		return -EINVAL;

	card = netdev_card(netdev);
	if (wol->wolopts & WAKE_MAGIC) {
		status = lv1_net_control(bus_id(card), dev_id(card),
					 GELIC_LV1_SET_WOL,
					 GELIC_LV1_WOL_MAGIC_PACKET,
					 0, GELIC_LV1_WOL_MP_ENABLE,
					 &v1, &v2);
		if (status) {
			pr_info("%s: enabling WOL failed %d\n", __func__,
				status);
			status = -EIO;
			goto done;
		}
		status = lv1_net_control(bus_id(card), dev_id(card),
					 GELIC_LV1_SET_WOL,
					 GELIC_LV1_WOL_ADD_MATCH_ADDR,
					 0, GELIC_LV1_WOL_MATCH_ALL,
					 &v1, &v2);
		if (!status)
			ps3_sys_manager_set_wol(1);
		else {
			pr_info("%s: enabling WOL filter failed %d\n",
				__func__, status);
			status = -EIO;
		}
	} else {
		status = lv1_net_control(bus_id(card), dev_id(card),
					 GELIC_LV1_SET_WOL,
					 GELIC_LV1_WOL_MAGIC_PACKET,
					 0, GELIC_LV1_WOL_MP_DISABLE,
					 &v1, &v2);
		if (status) {
			pr_info("%s: disabling WOL failed %d\n", __func__,
				status);
			status = -EIO;
			goto done;
		}
		status = lv1_net_control(bus_id(card), dev_id(card),
					 GELIC_LV1_SET_WOL,
					 GELIC_LV1_WOL_DELETE_MATCH_ADDR,
					 0, GELIC_LV1_WOL_MATCH_ALL,
					 &v1, &v2);
		if (!status)
			ps3_sys_manager_set_wol(0);
		else {
			pr_info("%s: removing WOL filter failed %d\n",
				__func__, status);
			status = -EIO;
		}
	}
done:
	return status;
}

static const struct ethtool_ops gelic_ether_ethtool_ops = {
	.get_drvinfo	= gelic_net_get_drvinfo,
	.get_link	= ethtool_op_get_link,
	.get_wol	= gelic_net_get_wol,
	.set_wol	= gelic_net_set_wol,
	.get_link_ksettings = gelic_ether_get_link_ksettings,
	.set_link_ksettings = gelic_ether_set_link_ksettings,
};

/**
 * gelic_net_tx_timeout_task - task scheduled by the watchdog timeout
 * function (to be called not under interrupt status)
 * @work: work is context of tx timout task
 *
 * called as task when tx hangs, resets interface (if interface is up)
 */
static void gelic_net_tx_timeout_task(struct work_struct *work)
{
	struct gelic_card *card =
		container_of(work, struct gelic_card, tx_timeout_task);
	struct net_device *netdev = card->netdev[GELIC_PORT_ETHERNET_0];

	dev_info(ctodev(card), "%s:Timed out. Restarting...\n", __func__);

	if (!(netdev->flags & IFF_UP))
		goto out;

	netif_device_detach(netdev);
	gelic_net_stop(netdev);

	gelic_net_open(netdev);
	netif_device_attach(netdev);

out:
	atomic_dec(&card->tx_timeout_task_counter);
}

/**
 * gelic_net_tx_timeout - called when the tx timeout watchdog kicks in.
 * @netdev: interface device structure
 *
 * called, if tx hangs. Schedules a task that resets the interface
 */
void gelic_net_tx_timeout(struct net_device *netdev)
{
	struct gelic_card *card;

	card = netdev_card(netdev);
	atomic_inc(&card->tx_timeout_task_counter);
	if (netdev->flags & IFF_UP)
		schedule_work(&card->tx_timeout_task);
	else
		atomic_dec(&card->tx_timeout_task_counter);
}

static const struct net_device_ops gelic_netdevice_ops = {
	.ndo_open = gelic_net_open,
	.ndo_stop = gelic_net_stop,
	.ndo_start_xmit = gelic_net_xmit,
	.ndo_set_rx_mode = gelic_net_set_multi,
	.ndo_tx_timeout = gelic_net_tx_timeout,
	.ndo_set_mac_address = eth_mac_addr,
	.ndo_validate_addr = eth_validate_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = gelic_net_poll_controller,
#endif
};

/**
 * gelic_ether_setup_netdev_ops - initialization of net_device operations
 * @netdev: net_device structure
 *
 * fills out function pointers in the net_device structure
 */
static void gelic_ether_setup_netdev_ops(struct net_device *netdev,
					 struct napi_struct *napi)
{
	netdev->watchdog_timeo = GELIC_NET_WATCHDOG_TIMEOUT;
	/* NAPI */
	netif_napi_add(netdev, napi, gelic_net_poll, NAPI_POLL_WEIGHT);
	netdev->ethtool_ops = &gelic_ether_ethtool_ops;
	netdev->netdev_ops = &gelic_netdevice_ops;
}

/**
 * gelic_ether_setup_netdev - initialization of net_device
 * @netdev: net_device structure
 * @card: card structure
 *
 * Returns 0 on success or <0 on failure
 *
 * gelic_ether_setup_netdev initializes the net_device structure
 * and register it.
 **/
int gelic_net_setup_netdev(struct net_device *netdev, struct gelic_card *card)
{
	int status;
	u64 v1, v2;

	netdev->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;

	netdev->features = NETIF_F_IP_CSUM;
	if (GELIC_CARD_RX_CSUM_DEFAULT)
		netdev->features |= NETIF_F_RXCSUM;

	status = lv1_net_control(bus_id(card), dev_id(card),
				 GELIC_LV1_GET_MAC_ADDRESS,
				 0, 0, 0, &v1, &v2);
	v1 <<= 16;
	if (status || !is_valid_ether_addr((u8 *)&v1)) {
		dev_info(ctodev(card),
			 "%s:lv1_net_control GET_MAC_ADDR failed %d\n",
			 __func__, status);
		return -EINVAL;
	}
	memcpy(netdev->dev_addr, &v1, ETH_ALEN);

	if (card->vlan_required) {
		netdev->hard_header_len += VLAN_HLEN;
		/*
		 * As vlan is internally used,
		 * we can not receive vlan packets
		 */
		netdev->features |= NETIF_F_VLAN_CHALLENGED;
	}

	/* MTU range: 64 - 1518 */
	netdev->min_mtu = GELIC_NET_MIN_MTU;
	netdev->max_mtu = GELIC_NET_MAX_MTU;

	status = register_netdev(netdev);
	if (status) {
		dev_err(ctodev(card), "%s:Couldn't register %s %d\n",
			__func__, netdev->name, status);
		return status;
	}
	dev_info(ctodev(card), "%s: MAC addr %pM\n",
		 netdev->name, netdev->dev_addr);

	return 0;
}

/**
 * gelic_alloc_card_net - allocates net_device and card structure
 *
 * returns the card structure or NULL in case of errors
 *
 * the card and net_device structures are linked to each other
 */
#define GELIC_ALIGN (32)
static struct gelic_card *gelic_alloc_card_net(struct net_device **netdev)
{
	struct gelic_card *card;
	struct gelic_port *port;
	void *p;
	size_t alloc_size;
	/*
	 * gelic requires dma descriptor is 32 bytes aligned and
	 * the hypervisor requires irq_status is 8 bytes aligned.
	 */
	BUILD_BUG_ON(offsetof(struct gelic_card, irq_status) % 8);
	BUILD_BUG_ON(offsetof(struct gelic_card, descr) % 32);
	alloc_size =
		sizeof(struct gelic_card) +
		sizeof(struct gelic_descr) * GELIC_NET_RX_DESCRIPTORS +
		sizeof(struct gelic_descr) * GELIC_NET_TX_DESCRIPTORS +
		GELIC_ALIGN - 1;

	p  = kzalloc(alloc_size, GFP_KERNEL);
	if (!p)
		return NULL;
	card = PTR_ALIGN(p, GELIC_ALIGN);
	card->unalign = p;

	/*
	 * alloc netdev
	 */
	*netdev = alloc_etherdev(sizeof(struct gelic_port));
	if (!*netdev) {
		kfree(card->unalign);
		return NULL;
	}
	port = netdev_priv(*netdev);

	/* gelic_port */
	port->netdev = *netdev;
	port->card = card;
	port->type = GELIC_PORT_ETHERNET_0;

	/* gelic_card */
	card->netdev[GELIC_PORT_ETHERNET_0] = *netdev;

	INIT_WORK(&card->tx_timeout_task, gelic_net_tx_timeout_task);
	init_waitqueue_head(&card->waitq);
	atomic_set(&card->tx_timeout_task_counter, 0);
	mutex_init(&card->updown_lock);
	atomic_set(&card->users, 0);

	return card;
}

static void gelic_card_get_vlan_info(struct gelic_card *card)
{
	u64 v1, v2;
	int status;
	unsigned int i;
	struct {
		int tx;
		int rx;
	} vlan_id_ix[2] = {
		[GELIC_PORT_ETHERNET_0] = {
			.tx = GELIC_LV1_VLAN_TX_ETHERNET_0,
			.rx = GELIC_LV1_VLAN_RX_ETHERNET_0
		},
		[GELIC_PORT_WIRELESS] = {
			.tx = GELIC_LV1_VLAN_TX_WIRELESS,
			.rx = GELIC_LV1_VLAN_RX_WIRELESS
		}
	};

	for (i = 0; i < ARRAY_SIZE(vlan_id_ix); i++) {
		/* tx tag */
		status = lv1_net_control(bus_id(card), dev_id(card),
					 GELIC_LV1_GET_VLAN_ID,
					 vlan_id_ix[i].tx,
					 0, 0, &v1, &v2);
		if (status || !v1) {
			if (status != LV1_NO_ENTRY)
				dev_dbg(ctodev(card),
					"get vlan id for tx(%d) failed(%d)\n",
					vlan_id_ix[i].tx, status);
			card->vlan[i].tx = 0;
			card->vlan[i].rx = 0;
			continue;
		}
		card->vlan[i].tx = (u16)v1;

		/* rx tag */
		status = lv1_net_control(bus_id(card), dev_id(card),
					 GELIC_LV1_GET_VLAN_ID,
					 vlan_id_ix[i].rx,
					 0, 0, &v1, &v2);
		if (status || !v1) {
			if (status != LV1_NO_ENTRY)
				dev_info(ctodev(card),
					 "get vlan id for rx(%d) failed(%d)\n",
					 vlan_id_ix[i].rx, status);
			card->vlan[i].tx = 0;
			card->vlan[i].rx = 0;
			continue;
		}
		card->vlan[i].rx = (u16)v1;

		dev_dbg(ctodev(card), "vlan_id[%d] tx=%02x rx=%02x\n",
			i, card->vlan[i].tx, card->vlan[i].rx);
	}

	if (card->vlan[GELIC_PORT_ETHERNET_0].tx) {
		BUG_ON(!card->vlan[GELIC_PORT_WIRELESS].tx);
		card->vlan_required = 1;
	} else
		card->vlan_required = 0;

	/* check wirelss capable firmware */
	if (ps3_compare_firmware_version(1, 6, 0) < 0) {
		card->vlan[GELIC_PORT_WIRELESS].tx = 0;
		card->vlan[GELIC_PORT_WIRELESS].rx = 0;
	}

	dev_info(ctodev(card), "internal vlan %s\n",
		 card->vlan_required? "enabled" : "disabled");
}
/**
 * ps3_gelic_driver_probe - add a device to the control of this driver
 */
static int ps3_gelic_driver_probe(struct ps3_system_bus_device *dev)
{
	struct gelic_card *card;
	struct net_device *netdev;
	int result;

	pr_debug("%s: called\n", __func__);

	udbg_shutdown_ps3gelic();

	result = ps3_open_hv_device(dev);

	if (result) {
		dev_dbg(&dev->core, "%s:ps3_open_hv_device failed\n",
			__func__);
		goto fail_open;
	}

	result = ps3_dma_region_create(dev->d_region);

	if (result) {
		dev_dbg(&dev->core, "%s:ps3_dma_region_create failed(%d)\n",
			__func__, result);
		BUG_ON("check region type");
		goto fail_dma_region;
	}

	/* alloc card/netdevice */
	card = gelic_alloc_card_net(&netdev);
	if (!card) {
		dev_info(&dev->core, "%s:gelic_net_alloc_card failed\n",
			 __func__);
		result = -ENOMEM;
		goto fail_alloc_card;
	}
	ps3_system_bus_set_drvdata(dev, card);
	card->dev = dev;

	/* get internal vlan info */
	gelic_card_get_vlan_info(card);

	card->link_mode = GELIC_LV1_ETHER_AUTO_NEG;

	/* setup interrupt */
	result = lv1_net_set_interrupt_status_indicator(bus_id(card),
							dev_id(card),
		ps3_mm_phys_to_lpar(__pa(&card->irq_status)),
		0);

	if (result) {
		dev_dbg(&dev->core,
			"%s:set_interrupt_status_indicator failed: %s\n",
			__func__, ps3_result(result));
		result = -EIO;
		goto fail_status_indicator;
	}

	result = ps3_sb_event_receive_port_setup(dev, PS3_BINDING_CPU_ANY,
		&card->irq);

	if (result) {
		dev_info(ctodev(card),
			 "%s:gelic_net_open_device failed (%d)\n",
			 __func__, result);
		result = -EPERM;
		goto fail_alloc_irq;
	}
	result = request_irq(card->irq, gelic_card_interrupt,
			     0, netdev->name, card);

	if (result) {
		dev_info(ctodev(card), "%s:request_irq failed (%d)\n",
			__func__, result);
		goto fail_request_irq;
	}

	/* setup card structure */
	card->irq_mask = GELIC_CARD_RXINT | GELIC_CARD_TXINT |
		GELIC_CARD_PORT_STATUS_CHANGED;


	result = gelic_card_init_chain(card, &card->tx_chain,
				       card->descr, GELIC_NET_TX_DESCRIPTORS);
	if (result)
		goto fail_alloc_tx;
	result = gelic_card_init_chain(card, &card->rx_chain,
				       card->descr + GELIC_NET_TX_DESCRIPTORS,
				       GELIC_NET_RX_DESCRIPTORS);
	if (result)
		goto fail_alloc_rx;

	/* head of chain */
	card->tx_top = card->tx_chain.head;
	card->rx_top = card->rx_chain.head;
	dev_dbg(ctodev(card), "descr rx %p, tx %p, size %#lx, num %#x\n",
		card->rx_top, card->tx_top, sizeof(struct gelic_descr),
		GELIC_NET_RX_DESCRIPTORS);
	/* allocate rx skbs */
	result = gelic_card_alloc_rx_skbs(card);
	if (result)
		goto fail_alloc_skbs;

	spin_lock_init(&card->tx_lock);
	card->tx_dma_progress = 0;

	/* setup net_device structure */
	netdev->irq = card->irq;
	SET_NETDEV_DEV(netdev, &card->dev->core);
	gelic_ether_setup_netdev_ops(netdev, &card->napi);
	result = gelic_net_setup_netdev(netdev, card);
	if (result) {
		dev_dbg(&dev->core, "%s: setup_netdev failed %d\n",
			__func__, result);
		goto fail_setup_netdev;
	}

#ifdef CONFIG_GELIC_WIRELESS
	result = gelic_wl_driver_probe(card);
	if (result) {
		dev_dbg(&dev->core, "%s: WL init failed\n", __func__);
		goto fail_setup_netdev;
	}
#endif
	pr_debug("%s: done\n", __func__);
	return 0;

fail_setup_netdev:
fail_alloc_skbs:
	gelic_card_free_chain(card, card->rx_chain.head);
fail_alloc_rx:
	gelic_card_free_chain(card, card->tx_chain.head);
fail_alloc_tx:
	free_irq(card->irq, card);
	netdev->irq = 0;
fail_request_irq:
	ps3_sb_event_receive_port_destroy(dev, card->irq);
fail_alloc_irq:
	lv1_net_set_interrupt_status_indicator(bus_id(card),
					       bus_id(card),
					       0, 0);
fail_status_indicator:
	ps3_system_bus_set_drvdata(dev, NULL);
	kfree(netdev_card(netdev)->unalign);
	free_netdev(netdev);
fail_alloc_card:
	ps3_dma_region_free(dev->d_region);
fail_dma_region:
	ps3_close_hv_device(dev);
fail_open:
	return result;
}

/**
 * ps3_gelic_driver_remove - remove a device from the control of this driver
 */

static int ps3_gelic_driver_remove(struct ps3_system_bus_device *dev)
{
	struct gelic_card *card = ps3_system_bus_get_drvdata(dev);
	struct net_device *netdev0;
	pr_debug("%s: called\n", __func__);

	/* set auto-negotiation */
	gelic_card_set_link_mode(card, GELIC_LV1_ETHER_AUTO_NEG);

#ifdef CONFIG_GELIC_WIRELESS
	gelic_wl_driver_remove(card);
#endif
	/* stop interrupt */
	gelic_card_set_irq_mask(card, 0);

	/* turn off DMA, force end */
	gelic_card_disable_rxdmac(card);
	gelic_card_disable_txdmac(card);

	/* release chains */
	gelic_card_release_tx_chain(card, 1);
	gelic_card_release_rx_chain(card);

	gelic_card_free_chain(card, card->tx_top);
	gelic_card_free_chain(card, card->rx_top);

	netdev0 = card->netdev[GELIC_PORT_ETHERNET_0];
	/* disconnect event port */
	free_irq(card->irq, card);
	netdev0->irq = 0;
	ps3_sb_event_receive_port_destroy(card->dev, card->irq);

	wait_event(card->waitq,
		   atomic_read(&card->tx_timeout_task_counter) == 0);

	lv1_net_set_interrupt_status_indicator(bus_id(card), dev_id(card),
					       0 , 0);

	unregister_netdev(netdev0);
	kfree(netdev_card(netdev0)->unalign);
	free_netdev(netdev0);

	ps3_system_bus_set_drvdata(dev, NULL);

	ps3_dma_region_free(dev->d_region);

	ps3_close_hv_device(dev);

	pr_debug("%s: done\n", __func__);
	return 0;
}

static struct ps3_system_bus_driver ps3_gelic_driver = {
	.match_id = PS3_MATCH_ID_GELIC,
	.probe = ps3_gelic_driver_probe,
	.remove = ps3_gelic_driver_remove,
	.shutdown = ps3_gelic_driver_remove,
	.core.name = "ps3_gelic_driver",
	.core.owner = THIS_MODULE,
};

static int __init ps3_gelic_driver_init (void)
{
	return firmware_has_feature(FW_FEATURE_PS3_LV1)
		? ps3_system_bus_driver_register(&ps3_gelic_driver)
		: -ENODEV;
}

static void __exit ps3_gelic_driver_exit (void)
{
	ps3_system_bus_driver_unregister(&ps3_gelic_driver);
}

module_init(ps3_gelic_driver_init);
module_exit(ps3_gelic_driver_exit);

MODULE_ALIAS(PS3_MODULE_ALIAS_GELIC);