summaryrefslogtreecommitdiff
path: root/target/linux/atheros/patches-2.6.32/110-ar2313_ethernet.patch
blob: 6f511a730d5297f1b6fc112c3c5c10241772a0f8 (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
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -359,6 +359,12 @@ config AX88796_93CX6
 	help
 	  Select this if your platform comes with an external 93CX6 eeprom.
 
+config AR231X_ETHERNET
+	tristate "AR231x Ethernet support"
+	depends on ATHEROS_AR231X
+	help
+	  Support for the AR231x/531x ethernet controller
+
 config MACE
 	tristate "MACE (Power Mac ethernet) support"
 	depends on PPC_PMAC && PPC32
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -216,6 +216,7 @@ obj-$(CONFIG_EQUALIZER) += eql.o
 obj-$(CONFIG_KORINA) += korina.o
 obj-$(CONFIG_MIPS_JAZZ_SONIC) += jazzsonic.o
 obj-$(CONFIG_MIPS_AU1X00_ENET) += au1000_eth.o
+obj-$(CONFIG_AR231X_ETHERNET) += ar231x.o
 obj-$(CONFIG_MIPS_SIM_NET) += mipsnet.o
 obj-$(CONFIG_SGI_IOC3_ETH) += ioc3-eth.o
 obj-$(CONFIG_DECLANCE) += declance.o
--- /dev/null
+++ b/drivers/net/ar231x.c
@@ -0,0 +1,1263 @@
+/*
+ * ar231x.c: Linux driver for the Atheros AR231x Ethernet device.
+ *
+ * Copyright (C) 2004 by Sameer Dekate <sdekate@arubanetworks.com>
+ * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Thanks to Atheros for providing hardware and documentation
+ * enabling me to write this driver.
+ *
+ * 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.
+ *
+ * Additional credits:
+ * 	This code is taken from John Taylor's Sibyte driver and then
+ * 	modified for the AR2313.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/sockios.h>
+#include <linux/pkt_sched.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/ethtool.h>
+#include <linux/ctype.h>
+#include <linux/platform_device.h>
+
+#include <net/sock.h>
+#include <net/ip.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/byteorder.h>
+#include <asm/uaccess.h>
+#include <asm/bootinfo.h>
+
+#define AR2313_MTU                     1692
+#define AR2313_PRIOS                   1
+#define AR2313_QUEUES                  (2*AR2313_PRIOS)
+#define AR2313_DESCR_ENTRIES           64
+
+
+#ifndef min
+#define min(a,b)	(((a)<(b))?(a):(b))
+#endif
+
+#ifndef SMP_CACHE_BYTES
+#define SMP_CACHE_BYTES	L1_CACHE_BYTES
+#endif
+
+#define AR2313_MBOX_SET_BIT  0x8
+
+#include "ar231x.h"
+
+/*
+ * New interrupt handler strategy:
+ *
+ * An old interrupt handler worked using the traditional method of
+ * replacing an skbuff with a new one when a packet arrives. However
+ * the rx rings do not need to contain a static number of buffer
+ * descriptors, thus it makes sense to move the memory allocation out
+ * of the main interrupt handler and do it in a bottom half handler
+ * and only allocate new buffers when the number of buffers in the
+ * ring is below a certain threshold. In order to avoid starving the
+ * NIC under heavy load it is however necessary to force allocation
+ * when hitting a minimum threshold. The strategy for alloction is as
+ * follows:
+ *
+ *     RX_LOW_BUF_THRES    - allocate buffers in the bottom half
+ *     RX_PANIC_LOW_THRES  - we are very low on buffers, allocate
+ *                           the buffers in the interrupt handler
+ *     RX_RING_THRES       - maximum number of buffers in the rx ring
+ *
+ * One advantagous side effect of this allocation approach is that the
+ * entire rx processing can be done without holding any spin lock
+ * since the rx rings and registers are totally independent of the tx
+ * ring and its registers.  This of course includes the kmalloc's of
+ * new skb's. Thus start_xmit can run in parallel with rx processing
+ * and the memory allocation on SMP systems.
+ *
+ * Note that running the skb reallocation in a bottom half opens up
+ * another can of races which needs to be handled properly. In
+ * particular it can happen that the interrupt handler tries to run
+ * the reallocation while the bottom half is either running on another
+ * CPU or was interrupted on the same CPU. To get around this the
+ * driver uses bitops to prevent the reallocation routines from being
+ * reentered.
+ *
+ * TX handling can also be done without holding any spin lock, wheee
+ * this is fun! since tx_csm is only written to by the interrupt
+ * handler.
+ */
+
+/*
+ * Threshold values for RX buffer allocation - the low water marks for
+ * when to start refilling the rings are set to 75% of the ring
+ * sizes. It seems to make sense to refill the rings entirely from the
+ * intrrupt handler once it gets below the panic threshold, that way
+ * we don't risk that the refilling is moved to another CPU when the
+ * one running the interrupt handler just got the slab code hot in its
+ * cache.
+ */
+#define RX_RING_SIZE		AR2313_DESCR_ENTRIES
+#define RX_PANIC_THRES	        (RX_RING_SIZE/4)
+#define RX_LOW_THRES	        ((3*RX_RING_SIZE)/4)
+#define CRC_LEN                 4
+#define RX_OFFSET               2
+
+#if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
+#define VLAN_HDR                4
+#else
+#define VLAN_HDR                0
+#endif
+
+#define AR2313_BUFSIZE		(AR2313_MTU + VLAN_HDR + ETH_HLEN + CRC_LEN + RX_OFFSET)
+
+#ifdef MODULE
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sameer Dekate <sdekate@arubanetworks.com>, Imre Kaloz <kaloz@openwrt.org>, Felix Fietkau <nbd@openwrt.org>");
+MODULE_DESCRIPTION("AR231x Ethernet driver");
+#endif
+
+#define virt_to_phys(x) ((u32)(x) & 0x1fffffff)
+
+// prototypes
+static void ar231x_halt(struct net_device *dev);
+static void rx_tasklet_func(unsigned long data);
+static void rx_tasklet_cleanup(struct net_device *dev);
+static void ar231x_multicast_list(struct net_device *dev);
+
+static int ar231x_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum);
+static int ar231x_mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum, u16 value);
+static int ar231x_mdiobus_reset(struct mii_bus *bus);
+static int ar231x_mdiobus_probe (struct net_device *dev);
+static void ar231x_adjust_link(struct net_device *dev);
+
+#ifndef ERR
+#define ERR(fmt, args...) printk("%s: " fmt, __func__, ##args)
+#endif
+
+static const struct net_device_ops ar231x_ops = {
+	.ndo_open = ar231x_open,
+	.ndo_stop = ar231x_close,
+	.ndo_start_xmit = ar231x_start_xmit,
+	.ndo_set_multicast_list = ar231x_multicast_list,
+	.ndo_do_ioctl = ar231x_ioctl,
+};
+
+int __init ar231x_probe(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct ar231x_private *sp;
+	struct resource *res;
+	unsigned long ar_eth_base;
+	char buf[64];
+
+	dev = alloc_etherdev(sizeof(struct ar231x_private));
+
+	if (dev == NULL) {
+		printk(KERN_ERR
+			   "ar231x: Unable to allocate net_device structure!\n");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, dev);
+
+	sp = netdev_priv(dev);
+	sp->dev = dev;
+	sp->cfg = pdev->dev.platform_data;
+
+	sprintf(buf, "eth%d_membase", pdev->id);
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, buf);
+	if (!res)
+		return -ENODEV;
+
+	sp->link = 0;
+	ar_eth_base = res->start;
+
+	sprintf(buf, "eth%d_irq", pdev->id);
+	dev->irq = platform_get_irq_byname(pdev, buf);
+
+	spin_lock_init(&sp->lock);
+
+	dev->features |= NETIF_F_HIGHDMA;
+	dev->netdev_ops = &ar231x_ops;
+
+	tasklet_init(&sp->rx_tasklet, rx_tasklet_func, (unsigned long) dev);
+	tasklet_disable(&sp->rx_tasklet);
+
+	sp->eth_regs =
+		ioremap_nocache(virt_to_phys(ar_eth_base), sizeof(*sp->eth_regs));
+	if (!sp->eth_regs) {
+		printk("Can't remap eth registers\n");
+		return (-ENXIO);
+	}
+
+	/*
+	 * When there's only one MAC, PHY regs are typically on ENET0,
+	 * even though the MAC might be on ENET1.
+	 * Needto remap PHY regs separately in this case
+	 */
+	if (virt_to_phys(ar_eth_base) == virt_to_phys(sp->phy_regs))
+		sp->phy_regs = sp->eth_regs;
+	else {
+		sp->phy_regs =
+			ioremap_nocache(virt_to_phys(sp->cfg->phy_base),
+							sizeof(*sp->phy_regs));
+		if (!sp->phy_regs) {
+			printk("Can't remap phy registers\n");
+			return (-ENXIO);
+		}
+	}
+
+	sp->dma_regs =
+		ioremap_nocache(virt_to_phys(ar_eth_base + 0x1000),
+						sizeof(*sp->dma_regs));
+	dev->base_addr = (unsigned int) sp->dma_regs;
+	if (!sp->dma_regs) {
+		printk("Can't remap DMA registers\n");
+		return (-ENXIO);
+	}
+
+	sp->int_regs = ioremap_nocache(virt_to_phys(sp->cfg->reset_base), 4);
+	if (!sp->int_regs) {
+		printk("Can't remap INTERRUPT registers\n");
+		return (-ENXIO);
+	}
+
+	strncpy(sp->name, "Atheros AR231x", sizeof(sp->name) - 1);
+	sp->name[sizeof(sp->name) - 1] = '\0';
+	memcpy(dev->dev_addr, sp->cfg->macaddr, 6);
+
+	if (ar231x_init(dev)) {
+		/*
+		 * ar231x_init() calls ar231x_init_cleanup() on error.
+		 */
+		kfree(dev);
+		return -ENODEV;
+	}
+
+	if (register_netdev(dev)) {
+		printk("%s: register_netdev failed\n", __func__);
+		return -1;
+	}
+
+	printk("%s: %s: %02x:%02x:%02x:%02x:%02x:%02x, irq %d\n",
+		   dev->name, sp->name,
+		   dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
+		   dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5], dev->irq);
+
+	sp->mii_bus = mdiobus_alloc();
+	if (sp->mii_bus == NULL)
+		return -1;
+
+	sp->mii_bus->priv = dev;
+	sp->mii_bus->read = ar231x_mdiobus_read;
+	sp->mii_bus->write = ar231x_mdiobus_write;
+	sp->mii_bus->reset = ar231x_mdiobus_reset;
+	sp->mii_bus->name = "ar231x_eth_mii";
+	snprintf(sp->mii_bus->id, MII_BUS_ID_SIZE, "%d", pdev->id);
+	sp->mii_bus->irq = kmalloc(sizeof(int), GFP_KERNEL);
+	*sp->mii_bus->irq = PHY_POLL;
+
+	mdiobus_register(sp->mii_bus);
+
+	if (ar231x_mdiobus_probe(dev) != 0) {
+		printk(KERN_ERR "%s: mdiobus_probe failed\n", dev->name);
+		rx_tasklet_cleanup(dev);
+		ar231x_init_cleanup(dev);
+		unregister_netdev(dev);
+		kfree(dev);
+		return -ENODEV;
+	}
+
+	/* start link poll timer */
+	ar231x_setup_timer(dev);
+
+	return 0;
+}
+
+
+static void ar231x_multicast_list(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	unsigned int filter;
+
+	filter = sp->eth_regs->mac_control;
+
+	if (dev->flags & IFF_PROMISC)
+		filter |= MAC_CONTROL_PR;
+	else
+		filter &= ~MAC_CONTROL_PR;
+	if ((dev->flags & IFF_ALLMULTI) || (dev->mc_count > 0))
+		filter |= MAC_CONTROL_PM;
+	else
+		filter &= ~MAC_CONTROL_PM;
+
+	sp->eth_regs->mac_control = filter;
+}
+
+static void rx_tasklet_cleanup(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+
+	/*
+	 * Tasklet may be scheduled. Need to get it removed from the list
+	 * since we're about to free the struct.
+	 */
+
+	sp->unloading = 1;
+	tasklet_enable(&sp->rx_tasklet);
+	tasklet_kill(&sp->rx_tasklet);
+}
+
+static int __exit ar231x_remove(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+	struct ar231x_private *sp = netdev_priv(dev);
+	rx_tasklet_cleanup(dev);
+	ar231x_init_cleanup(dev);
+	unregister_netdev(dev);
+	mdiobus_unregister(sp->mii_bus);
+	mdiobus_free(sp->mii_bus);
+	kfree(dev);
+	return 0;
+}
+
+
+/*
+ * Restart the AR2313 ethernet controller.
+ */
+static int ar231x_restart(struct net_device *dev)
+{
+	/* disable interrupts */
+	disable_irq(dev->irq);
+
+	/* stop mac */
+	ar231x_halt(dev);
+
+	/* initialize */
+	ar231x_init(dev);
+
+	/* enable interrupts */
+	enable_irq(dev->irq);
+
+	return 0;
+}
+
+static struct platform_driver ar231x_driver = {
+	.driver.name = "ar231x-eth",
+	.probe = ar231x_probe,
+	.remove = ar231x_remove,
+};
+
+int __init ar231x_module_init(void)
+{
+	return platform_driver_register(&ar231x_driver);
+}
+
+void __exit ar231x_module_cleanup(void)
+{
+	platform_driver_unregister(&ar231x_driver);
+}
+
+module_init(ar231x_module_init);
+module_exit(ar231x_module_cleanup);
+
+
+static void ar231x_free_descriptors(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	if (sp->rx_ring != NULL) {
+		kfree((void *) KSEG0ADDR(sp->rx_ring));
+		sp->rx_ring = NULL;
+		sp->tx_ring = NULL;
+	}
+}
+
+
+static int ar231x_allocate_descriptors(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	int size;
+	int j;
+	ar231x_descr_t *space;
+
+	if (sp->rx_ring != NULL) {
+		printk("%s: already done.\n", __FUNCTION__);
+		return 0;
+	}
+
+	size =
+		(sizeof(ar231x_descr_t) * (AR2313_DESCR_ENTRIES * AR2313_QUEUES));
+	space = kmalloc(size, GFP_KERNEL);
+	if (space == NULL)
+		return 1;
+
+	/* invalidate caches */
+	dma_cache_inv((unsigned int) space, size);
+
+	/* now convert pointer to KSEG1 */
+	space = (ar231x_descr_t *) KSEG1ADDR(space);
+
+	memset((void *) space, 0, size);
+
+	sp->rx_ring = space;
+	space += AR2313_DESCR_ENTRIES;
+
+	sp->tx_ring = space;
+	space += AR2313_DESCR_ENTRIES;
+
+	/* Initialize the transmit Descriptors */
+	for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+		ar231x_descr_t *td = &sp->tx_ring[j];
+		td->status = 0;
+		td->devcs = DMA_TX1_CHAINED;
+		td->addr = 0;
+		td->descr =
+			virt_to_phys(&sp->
+						 tx_ring[(j + 1) & (AR2313_DESCR_ENTRIES - 1)]);
+	}
+
+	return 0;
+}
+
+
+/*
+ * Generic cleanup handling data allocated during init. Used when the
+ * module is unloaded or if an error occurs during initialization
+ */
+static void ar231x_init_cleanup(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	struct sk_buff *skb;
+	int j;
+
+	ar231x_free_descriptors(dev);
+
+	if (sp->eth_regs)
+		iounmap((void *) sp->eth_regs);
+	if (sp->dma_regs)
+		iounmap((void *) sp->dma_regs);
+
+	if (sp->rx_skb) {
+		for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+			skb = sp->rx_skb[j];
+			if (skb) {
+				sp->rx_skb[j] = NULL;
+				dev_kfree_skb(skb);
+			}
+		}
+		kfree(sp->rx_skb);
+		sp->rx_skb = NULL;
+	}
+
+	if (sp->tx_skb) {
+		for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+			skb = sp->tx_skb[j];
+			if (skb) {
+				sp->tx_skb[j] = NULL;
+				dev_kfree_skb(skb);
+			}
+		}
+		kfree(sp->tx_skb);
+		sp->tx_skb = NULL;
+	}
+}
+
+static int ar231x_setup_timer(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+
+	init_timer(&sp->link_timer);
+
+	sp->link_timer.function = ar231x_link_timer_fn;
+	sp->link_timer.data = (int) dev;
+	sp->link_timer.expires = jiffies + HZ;
+
+	add_timer(&sp->link_timer);
+	return 0;
+
+}
+
+static void ar231x_link_timer_fn(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *) data;
+	struct ar231x_private *sp = netdev_priv(dev);
+
+	// see if the link status changed
+	// This was needed to make sure we set the PHY to the
+	// autonegotiated value of half or full duplex.
+	ar231x_check_link(dev);
+
+	// Loop faster when we don't have link.
+	// This was needed to speed up the AP bootstrap time.
+	if (sp->link == 0) {
+		mod_timer(&sp->link_timer, jiffies + HZ / 2);
+	} else {
+		mod_timer(&sp->link_timer, jiffies + LINK_TIMER);
+	}
+}
+
+static void ar231x_check_link(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	u16 phyData;
+
+	phyData = ar231x_mdiobus_read(sp->mii_bus, sp->phy, MII_BMSR);
+	if (sp->phyData != phyData) {
+		if (phyData & BMSR_LSTATUS) {
+			/* link is present, ready link partner ability to deterine
+			   duplexity */
+			int duplex = 0;
+			u16 reg;
+
+			sp->link = 1;
+			reg = ar231x_mdiobus_read(sp->mii_bus, sp->phy, MII_BMCR);
+			if (reg & BMCR_ANENABLE) {
+				/* auto neg enabled */
+				reg = ar231x_mdiobus_read(sp->mii_bus, sp->phy, MII_LPA);
+				duplex = (reg & (LPA_100FULL | LPA_10FULL)) ? 1 : 0;
+			} else {
+				/* no auto neg, just read duplex config */
+				duplex = (reg & BMCR_FULLDPLX) ? 1 : 0;
+			}
+
+			printk(KERN_INFO "%s: Configuring MAC for %s duplex\n",
+				   dev->name, (duplex) ? "full" : "half");
+
+			if (duplex) {
+				/* full duplex */
+				sp->eth_regs->mac_control =
+					((sp->eth_regs->
+					  mac_control | MAC_CONTROL_F) & ~MAC_CONTROL_DRO);
+			} else {
+				/* half duplex */
+				sp->eth_regs->mac_control =
+					((sp->eth_regs->
+					  mac_control | MAC_CONTROL_DRO) & ~MAC_CONTROL_F);
+			}
+		} else {
+			/* no link */
+			sp->link = 0;
+		}
+		sp->phyData = phyData;
+	}
+}
+
+static int ar231x_reset_reg(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	unsigned int ethsal, ethsah;
+	unsigned int flags;
+
+	*sp->int_regs |= sp->cfg->reset_mac;
+	mdelay(10);
+	*sp->int_regs &= ~sp->cfg->reset_mac;
+	mdelay(10);
+	*sp->int_regs |= sp->cfg->reset_phy;
+	mdelay(10);
+	*sp->int_regs &= ~sp->cfg->reset_phy;
+	mdelay(10);
+
+	sp->dma_regs->bus_mode = (DMA_BUS_MODE_SWR);
+	mdelay(10);
+	sp->dma_regs->bus_mode =
+		((32 << DMA_BUS_MODE_PBL_SHIFT) | DMA_BUS_MODE_BLE);
+
+	/* enable interrupts */
+	sp->dma_regs->intr_ena = (DMA_STATUS_AIS |
+							  DMA_STATUS_NIS |
+							  DMA_STATUS_RI |
+							  DMA_STATUS_TI | DMA_STATUS_FBE);
+	sp->dma_regs->xmt_base = virt_to_phys(sp->tx_ring);
+	sp->dma_regs->rcv_base = virt_to_phys(sp->rx_ring);
+	sp->dma_regs->control =
+		(DMA_CONTROL_SR | DMA_CONTROL_ST | DMA_CONTROL_SF);
+
+	sp->eth_regs->flow_control = (FLOW_CONTROL_FCE);
+	sp->eth_regs->vlan_tag = (0x8100);
+
+	/* Enable Ethernet Interface */
+	flags = (MAC_CONTROL_TE |	/* transmit enable */
+			 MAC_CONTROL_PM |	/* pass mcast */
+			 MAC_CONTROL_F |	/* full duplex */
+			 MAC_CONTROL_HBD);	/* heart beat disabled */
+
+	if (dev->flags & IFF_PROMISC) {	/* set promiscuous mode */
+		flags |= MAC_CONTROL_PR;
+	}
+	sp->eth_regs->mac_control = flags;
+
+	/* Set all Ethernet station address registers to their initial values */
+	ethsah = ((((u_int) (dev->dev_addr[5]) << 8) & (u_int) 0x0000FF00) |
+			  (((u_int) (dev->dev_addr[4]) << 0) & (u_int) 0x000000FF));
+
+	ethsal = ((((u_int) (dev->dev_addr[3]) << 24) & (u_int) 0xFF000000) |
+			  (((u_int) (dev->dev_addr[2]) << 16) & (u_int) 0x00FF0000) |
+			  (((u_int) (dev->dev_addr[1]) << 8) & (u_int) 0x0000FF00) |
+			  (((u_int) (dev->dev_addr[0]) << 0) & (u_int) 0x000000FF));
+
+	sp->eth_regs->mac_addr[0] = ethsah;
+	sp->eth_regs->mac_addr[1] = ethsal;
+
+	mdelay(10);
+
+	return (0);
+}
+
+
+static int ar231x_init(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	int ecode = 0;
+
+	/*
+	 * Allocate descriptors
+	 */
+	if (ar231x_allocate_descriptors(dev)) {
+		printk("%s: %s: ar231x_allocate_descriptors failed\n",
+			   dev->name, __FUNCTION__);
+		ecode = -EAGAIN;
+		goto init_error;
+	}
+
+	/*
+	 * Get the memory for the skb rings.
+	 */
+	if (sp->rx_skb == NULL) {
+		sp->rx_skb =
+			kmalloc(sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES,
+					GFP_KERNEL);
+		if (!(sp->rx_skb)) {
+			printk("%s: %s: rx_skb kmalloc failed\n",
+				   dev->name, __FUNCTION__);
+			ecode = -EAGAIN;
+			goto init_error;
+		}
+	}
+	memset(sp->rx_skb, 0, sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES);
+
+	if (sp->tx_skb == NULL) {
+		sp->tx_skb =
+			kmalloc(sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES,
+					GFP_KERNEL);
+		if (!(sp->tx_skb)) {
+			printk("%s: %s: tx_skb kmalloc failed\n",
+				   dev->name, __FUNCTION__);
+			ecode = -EAGAIN;
+			goto init_error;
+		}
+	}
+	memset(sp->tx_skb, 0, sizeof(struct sk_buff *) * AR2313_DESCR_ENTRIES);
+
+	/*
+	 * Set tx_csm before we start receiving interrupts, otherwise
+	 * the interrupt handler might think it is supposed to process
+	 * tx ints before we are up and running, which may cause a null
+	 * pointer access in the int handler.
+	 */
+	sp->rx_skbprd = 0;
+	sp->cur_rx = 0;
+	sp->tx_prd = 0;
+	sp->tx_csm = 0;
+
+	/*
+	 * Zero the stats before starting the interface
+	 */
+	memset(&dev->stats, 0, sizeof(dev->stats));
+
+	/*
+	 * We load the ring here as there seem to be no way to tell the
+	 * firmware to wipe the ring without re-initializing it.
+	 */
+	ar231x_load_rx_ring(dev, RX_RING_SIZE);
+
+	/*
+	 * Init hardware
+	 */
+	ar231x_reset_reg(dev);
+
+	/*
+	 * Get the IRQ
+	 */
+	ecode =
+		request_irq(dev->irq, &ar231x_interrupt,
+					IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
+					dev->name, dev);
+	if (ecode) {
+		printk(KERN_WARNING "%s: %s: Requested IRQ %d is busy\n",
+			   dev->name, __FUNCTION__, dev->irq);
+		goto init_error;
+	}
+
+
+	tasklet_enable(&sp->rx_tasklet);
+
+	return 0;
+
+  init_error:
+	ar231x_init_cleanup(dev);
+	return ecode;
+}
+
+/*
+ * Load the rx ring.
+ *
+ * Loading rings is safe without holding the spin lock since this is
+ * done only before the device is enabled, thus no interrupts are
+ * generated and by the interrupt handler/tasklet handler.
+ */
+static void ar231x_load_rx_ring(struct net_device *dev, int nr_bufs)
+{
+
+	struct ar231x_private *sp = netdev_priv(dev);
+	short i, idx;
+
+	idx = sp->rx_skbprd;
+
+	for (i = 0; i < nr_bufs; i++) {
+		struct sk_buff *skb;
+		ar231x_descr_t *rd;
+
+		if (sp->rx_skb[idx])
+			break;
+
+		skb = netdev_alloc_skb(dev, AR2313_BUFSIZE);
+		if (!skb) {
+			printk("\n\n\n\n %s: No memory in system\n\n\n\n",
+				   __FUNCTION__);
+			break;
+		}
+
+		/*
+		 * Make sure IP header starts on a fresh cache line.
+		 */
+		skb->dev = dev;
+		skb_reserve(skb, RX_OFFSET);
+		sp->rx_skb[idx] = skb;
+
+		rd = (ar231x_descr_t *) & sp->rx_ring[idx];
+
+		/* initialize dma descriptor */
+		rd->devcs = ((AR2313_BUFSIZE << DMA_RX1_BSIZE_SHIFT) |
+					 DMA_RX1_CHAINED);
+		rd->addr = virt_to_phys(skb->data);
+		rd->descr =
+			virt_to_phys(&sp->
+						 rx_ring[(idx + 1) & (AR2313_DESCR_ENTRIES - 1)]);
+		rd->status = DMA_RX_OWN;
+
+		idx = DSC_NEXT(idx);
+	}
+
+	if (i)
+		sp->rx_skbprd = idx;
+
+	return;
+}
+
+#define AR2313_MAX_PKTS_PER_CALL        64
+
+static int ar231x_rx_int(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	struct sk_buff *skb, *skb_new;
+	ar231x_descr_t *rxdesc;
+	unsigned int status;
+	u32 idx;
+	int pkts = 0;
+	int rval;
+
+	idx = sp->cur_rx;
+
+	/* process at most the entire ring and then wait for another interrupt
+	 */
+	while (1) {
+
+		rxdesc = &sp->rx_ring[idx];
+		status = rxdesc->status;
+		if (status & DMA_RX_OWN) {
+			/* SiByte owns descriptor or descr not yet filled in */
+			rval = 0;
+			break;
+		}
+
+		if (++pkts > AR2313_MAX_PKTS_PER_CALL) {
+			rval = 1;
+			break;
+		}
+
+		if ((status & DMA_RX_ERROR) && !(status & DMA_RX_LONG)) {
+			dev->stats.rx_errors++;
+			dev->stats.rx_dropped++;
+
+			/* add statistics counters */
+			if (status & DMA_RX_ERR_CRC)
+				dev->stats.rx_crc_errors++;
+			if (status & DMA_RX_ERR_COL)
+				dev->stats.rx_over_errors++;
+			if (status & DMA_RX_ERR_LENGTH)
+				dev->stats.rx_length_errors++;
+			if (status & DMA_RX_ERR_RUNT)
+				dev->stats.rx_over_errors++;
+			if (status & DMA_RX_ERR_DESC)
+				dev->stats.rx_over_errors++;
+
+		} else {
+			/* alloc new buffer. */
+			skb_new = netdev_alloc_skb(dev, AR2313_BUFSIZE + RX_OFFSET);
+			if (skb_new != NULL) {
+
+				skb = sp->rx_skb[idx];
+				/* set skb */
+				skb_put(skb,
+						((status >> DMA_RX_LEN_SHIFT) & 0x3fff) - CRC_LEN);
+
+				dev->stats.rx_bytes += skb->len;
+				skb->protocol = eth_type_trans(skb, dev);
+				/* pass the packet to upper layers */
+				netif_rx(skb);
+
+				skb_new->dev = dev;
+				/* 16 bit align */
+				skb_reserve(skb_new, RX_OFFSET);
+				/* reset descriptor's curr_addr */
+				rxdesc->addr = virt_to_phys(skb_new->data);
+
+				dev->stats.rx_packets++;
+				sp->rx_skb[idx] = skb_new;
+			} else {
+				dev->stats.rx_dropped++;
+			}
+		}
+
+		rxdesc->devcs = ((AR2313_BUFSIZE << DMA_RX1_BSIZE_SHIFT) |
+						 DMA_RX1_CHAINED);
+		rxdesc->status = DMA_RX_OWN;
+
+		idx = DSC_NEXT(idx);
+	}
+
+	sp->cur_rx = idx;
+
+	return rval;
+}
+
+
+static void ar231x_tx_int(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	u32 idx;
+	struct sk_buff *skb;
+	ar231x_descr_t *txdesc;
+	unsigned int status = 0;
+
+	idx = sp->tx_csm;
+
+	while (idx != sp->tx_prd) {
+		txdesc = &sp->tx_ring[idx];
+
+		if ((status = txdesc->status) & DMA_TX_OWN) {
+			/* ar231x dma still owns descr */
+			break;
+		}
+		/* done with this descriptor */
+		dma_unmap_single(NULL, txdesc->addr,
+						 txdesc->devcs & DMA_TX1_BSIZE_MASK,
+						 DMA_TO_DEVICE);
+		txdesc->status = 0;
+
+		if (status & DMA_TX_ERROR) {
+			dev->stats.tx_errors++;
+			dev->stats.tx_dropped++;
+			if (status & DMA_TX_ERR_UNDER)
+				dev->stats.tx_fifo_errors++;
+			if (status & DMA_TX_ERR_HB)
+				dev->stats.tx_heartbeat_errors++;
+			if (status & (DMA_TX_ERR_LOSS | DMA_TX_ERR_LINK))
+				dev->stats.tx_carrier_errors++;
+			if (status & (DMA_TX_ERR_LATE |
+						  DMA_TX_ERR_COL |
+						  DMA_TX_ERR_JABBER | DMA_TX_ERR_DEFER))
+				dev->stats.tx_aborted_errors++;
+		} else {
+			/* transmit OK */
+			dev->stats.tx_packets++;
+		}
+
+		skb = sp->tx_skb[idx];
+		sp->tx_skb[idx] = NULL;
+		idx = DSC_NEXT(idx);
+		dev->stats.tx_bytes += skb->len;
+		dev_kfree_skb_irq(skb);
+	}
+
+	sp->tx_csm = idx;
+
+	return;
+}
+
+
+static void rx_tasklet_func(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *) data;
+	struct ar231x_private *sp = netdev_priv(dev);
+
+	if (sp->unloading) {
+		return;
+	}
+
+	if (ar231x_rx_int(dev)) {
+		tasklet_hi_schedule(&sp->rx_tasklet);
+	} else {
+		unsigned long flags;
+		spin_lock_irqsave(&sp->lock, flags);
+		sp->dma_regs->intr_ena |= DMA_STATUS_RI;
+		spin_unlock_irqrestore(&sp->lock, flags);
+	}
+}
+
+static void rx_schedule(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+
+	sp->dma_regs->intr_ena &= ~DMA_STATUS_RI;
+
+	tasklet_hi_schedule(&sp->rx_tasklet);
+}
+
+static irqreturn_t ar231x_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *) dev_id;
+	struct ar231x_private *sp = netdev_priv(dev);
+	unsigned int status, enabled;
+
+	/* clear interrupt */
+	/*
+	 * Don't clear RI bit if currently disabled.
+	 */
+	status = sp->dma_regs->status;
+	enabled = sp->dma_regs->intr_ena;
+	sp->dma_regs->status = status & enabled;
+
+	if (status & DMA_STATUS_NIS) {
+		/* normal status */
+		/*
+		 * Don't schedule rx processing if interrupt
+		 * is already disabled.
+		 */
+		if (status & enabled & DMA_STATUS_RI) {
+			/* receive interrupt */
+			rx_schedule(dev);
+		}
+		if (status & DMA_STATUS_TI) {
+			/* transmit interrupt */
+			ar231x_tx_int(dev);
+		}
+	}
+
+	/* abnormal status */
+	if (status & (DMA_STATUS_FBE | DMA_STATUS_TPS)) {
+		ar231x_restart(dev);
+	}
+	return IRQ_HANDLED;
+}
+
+
+static int ar231x_open(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	unsigned int ethsal, ethsah;
+
+	/* reset the hardware, in case the MAC address changed */
+	ethsah = ((((u_int) (dev->dev_addr[5]) << 8) & (u_int) 0x0000FF00) |
+			  (((u_int) (dev->dev_addr[4]) << 0) & (u_int) 0x000000FF));
+
+	ethsal = ((((u_int) (dev->dev_addr[3]) << 24) & (u_int) 0xFF000000) |
+			  (((u_int) (dev->dev_addr[2]) << 16) & (u_int) 0x00FF0000) |
+			  (((u_int) (dev->dev_addr[1]) << 8) & (u_int) 0x0000FF00) |
+			  (((u_int) (dev->dev_addr[0]) << 0) & (u_int) 0x000000FF));
+
+	sp->eth_regs->mac_addr[0] = ethsah;
+	sp->eth_regs->mac_addr[1] = ethsal;
+
+	mdelay(10);
+
+	dev->mtu = 1500;
+	netif_start_queue(dev);
+
+	sp->eth_regs->mac_control |= MAC_CONTROL_RE;
+
+	return 0;
+}
+
+static void ar231x_halt(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	int j;
+
+	tasklet_disable(&sp->rx_tasklet);
+
+	/* kill the MAC */
+	sp->eth_regs->mac_control &= ~(MAC_CONTROL_RE |	/* disable Receives */
+								   MAC_CONTROL_TE);	/* disable Transmits */
+	/* stop dma */
+	sp->dma_regs->control = 0;
+	sp->dma_regs->bus_mode = DMA_BUS_MODE_SWR;
+
+	/* place phy and MAC in reset */
+	*sp->int_regs |= (sp->cfg->reset_mac | sp->cfg->reset_phy);
+
+	/* free buffers on tx ring */
+	for (j = 0; j < AR2313_DESCR_ENTRIES; j++) {
+		struct sk_buff *skb;
+		ar231x_descr_t *txdesc;
+
+		txdesc = &sp->tx_ring[j];
+		txdesc->descr = 0;
+
+		skb = sp->tx_skb[j];
+		if (skb) {
+			dev_kfree_skb(skb);
+			sp->tx_skb[j] = NULL;
+		}
+	}
+}
+
+/*
+ * close should do nothing. Here's why. It's called when
+ * 'ifconfig bond0 down' is run. If it calls free_irq then
+ * the irq is gone forever ! When bond0 is made 'up' again,
+ * the ar231x_open () does not call request_irq (). Worse,
+ * the call to ar231x_halt() generates a WDOG reset due to
+ * the write to 'sp->int_regs' and the box reboots.
+ * Commenting this out is good since it allows the
+ * system to resume when bond0 is made up again.
+ */
+static int ar231x_close(struct net_device *dev)
+{
+#if 0
+	/*
+	 * Disable interrupts
+	 */
+	disable_irq(dev->irq);
+
+	/*
+	 * Without (or before) releasing irq and stopping hardware, this
+	 * is an absolute non-sense, by the way. It will be reset instantly
+	 * by the first irq.
+	 */
+	netif_stop_queue(dev);
+
+	/* stop the MAC and DMA engines */
+	ar231x_halt(dev);
+
+	/* release the interrupt */
+	free_irq(dev->irq, dev);
+
+#endif
+	return 0;
+}
+
+static int ar231x_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	ar231x_descr_t *td;
+	u32 idx;
+
+	idx = sp->tx_prd;
+	td = &sp->tx_ring[idx];
+
+	if (td->status & DMA_TX_OWN) {
+		/* free skbuf and lie to the caller that we sent it out */
+		dev->stats.tx_dropped++;
+		dev_kfree_skb(skb);
+
+		/* restart transmitter in case locked */
+		sp->dma_regs->xmt_poll = 0;
+		return 0;
+	}
+
+	/* Setup the transmit descriptor. */
+	td->devcs = ((skb->len << DMA_TX1_BSIZE_SHIFT) |
+				 (DMA_TX1_LS | DMA_TX1_IC | DMA_TX1_CHAINED));
+	td->addr = dma_map_single(NULL, skb->data, skb->len, DMA_TO_DEVICE);
+	td->status = DMA_TX_OWN;
+
+	/* kick transmitter last */
+	sp->dma_regs->xmt_poll = 0;
+
+	sp->tx_skb[idx] = skb;
+	idx = DSC_NEXT(idx);
+	sp->tx_prd = idx;
+
+	return 0;
+}
+
+static int ar231x_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct mii_ioctl_data *data = (struct mii_ioctl_data *) &ifr->ifr_data;
+	struct ar231x_private *sp = netdev_priv(dev);
+	int ret;
+
+	switch (cmd) {
+
+	case SIOCETHTOOL:
+		spin_lock_irq(&sp->lock);
+		ret = phy_ethtool_ioctl(sp->phy_dev, (void *) ifr->ifr_data);
+		spin_unlock_irq(&sp->lock);
+		return ret;
+
+	case SIOCSIFHWADDR:
+		if (copy_from_user
+			(dev->dev_addr, ifr->ifr_data, sizeof(dev->dev_addr)))
+			return -EFAULT;
+		return 0;
+
+	case SIOCGIFHWADDR:
+		if (copy_to_user
+			(ifr->ifr_data, dev->dev_addr, sizeof(dev->dev_addr)))
+			return -EFAULT;
+		return 0;
+
+	case SIOCGMIIPHY:
+	case SIOCGMIIREG:
+	case SIOCSMIIREG:
+		return phy_mii_ioctl(sp->phy_dev, data, cmd);
+
+	default:
+		break;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static void ar231x_adjust_link(struct net_device *dev)
+{
+	struct ar231x_private *sp = netdev_priv(dev);
+	unsigned int mc;
+
+	if (!sp->phy_dev->link)
+		return;
+
+	if (sp->phy_dev->duplex != sp->oldduplex) {
+		mc = readl(&sp->eth_regs->mac_control);
+		mc &= ~(MAC_CONTROL_F | MAC_CONTROL_DRO);
+		if (sp->phy_dev->duplex)
+			mc |= MAC_CONTROL_F;
+		else
+			mc |= MAC_CONTROL_DRO;
+		writel(mc, &sp->eth_regs->mac_control);
+		sp->oldduplex = sp->phy_dev->duplex;
+	}
+}
+
+#define MII_ADDR(phy, reg) \
+	((reg << MII_ADDR_REG_SHIFT) | (phy << MII_ADDR_PHY_SHIFT))
+
+static int
+ar231x_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
+{
+	struct net_device *const dev = bus->priv;
+	struct ar231x_private *sp = netdev_priv(dev);
+	volatile ETHERNET_STRUCT *ethernet = sp->phy_regs;
+
+	ethernet->mii_addr = MII_ADDR(phy_addr, regnum);
+	while (ethernet->mii_addr & MII_ADDR_BUSY);
+	return (ethernet->mii_data >> MII_DATA_SHIFT);
+}
+
+static int
+ar231x_mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum,
+             u16 value)
+{
+	struct net_device *const dev = bus->priv;
+	struct ar231x_private *sp = netdev_priv(dev);
+	volatile ETHERNET_STRUCT *ethernet = sp->phy_regs;
+
+	while (ethernet->mii_addr & MII_ADDR_BUSY);
+	ethernet->mii_data = value << MII_DATA_SHIFT;
+	ethernet->mii_addr = MII_ADDR(phy_addr, regnum) | MII_ADDR_WRITE;
+
+	return 0;
+}
+
+static int ar231x_mdiobus_reset(struct mii_bus *bus)
+{
+	struct net_device *const dev = bus->priv;
+
+	ar231x_reset_reg(dev);
+
+	return 0;
+}
+
+static int ar231x_mdiobus_probe (struct net_device *dev)
+{
+	struct ar231x_private *const sp = netdev_priv(dev);
+	struct phy_device *phydev = NULL;
+	int phy_addr;
+
+	/* find the first (lowest address) PHY on the current MAC's MII bus */
+	for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++)
+		if (sp->mii_bus->phy_map[phy_addr]) {
+			phydev = sp->mii_bus->phy_map[phy_addr];
+			sp->phy = phy_addr;
+			break; /* break out with first one found */
+		}
+
+	if (!phydev) {
+		printk (KERN_ERR "ar231x: %s: no PHY found\n", dev->name);
+		return -1;
+	}
+
+	/* now we are supposed to have a proper phydev, to attach to... */
+	BUG_ON(!phydev);
+	BUG_ON(phydev->attached_dev);
+
+	phydev = phy_connect(dev, dev_name(&phydev->dev), &ar231x_adjust_link, 0,
+		PHY_INTERFACE_MODE_MII);
+
+	if (IS_ERR(phydev)) {
+		printk(KERN_ERR "%s: Could not attach to PHY\n", dev->name);
+		return PTR_ERR(phydev);
+	}
+
+	/* mask with MAC supported features */
+	phydev->supported &= (SUPPORTED_10baseT_Half
+		| SUPPORTED_10baseT_Full
+		| SUPPORTED_100baseT_Half
+		| SUPPORTED_100baseT_Full
+		| SUPPORTED_Autoneg
+		/* | SUPPORTED_Pause | SUPPORTED_Asym_Pause */
+		| SUPPORTED_MII
+		| SUPPORTED_TP);
+
+	phydev->advertising = phydev->supported;
+
+	sp->oldduplex = -1;
+	sp->phy_dev = phydev;
+
+	printk(KERN_INFO "%s: attached PHY driver [%s] "
+		"(mii_bus:phy_addr=%s)\n",
+		dev->name, phydev->drv->name, dev_name(&phydev->dev));
+
+	return 0;
+}
+
--- /dev/null
+++ b/drivers/net/ar231x.h
@@ -0,0 +1,302 @@
+/*
+ * ar231x.h: Linux driver for the Atheros AR231x Ethernet device.
+ *
+ * Copyright (C) 2004 by Sameer Dekate <sdekate@arubanetworks.com>
+ * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
+ * Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
+ *
+ * Thanks to Atheros for providing hardware and documentation
+ * enabling me to write this driver.
+ *
+ * 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.
+ */
+
+#ifndef _AR2313_H_
+#define _AR2313_H_
+
+#include <linux/autoconf.h>
+#include <linux/bitops.h>
+#include <asm/bootinfo.h>
+#include <ar231x_platform.h>
+
+/*
+ * probe link timer - 5 secs
+ */
+#define LINK_TIMER    (5*HZ)
+
+#define IS_DMA_TX_INT(X)   (((X) & (DMA_STATUS_TI)) != 0)
+#define IS_DMA_RX_INT(X)   (((X) & (DMA_STATUS_RI)) != 0)
+#define IS_DRIVER_OWNED(X) (((X) & (DMA_TX_OWN))    == 0)
+
+#define AR2313_TX_TIMEOUT (HZ/4)
+
+/*
+ * Rings
+ */
+#define DSC_RING_ENTRIES_SIZE	(AR2313_DESCR_ENTRIES * sizeof(struct desc))
+#define DSC_NEXT(idx)	        ((idx + 1) & (AR2313_DESCR_ENTRIES - 1))
+
+#define AR2313_MBGET		2
+#define AR2313_MBSET		3
+#define AR2313_PCI_RECONFIG	4
+#define AR2313_PCI_DUMP		5
+#define AR2313_TEST_PANIC	6
+#define AR2313_TEST_NULLPTR	7
+#define AR2313_READ_DATA	8
+#define AR2313_WRITE_DATA	9
+#define AR2313_GET_VERSION	10
+#define AR2313_TEST_HANG	11
+#define AR2313_SYNC		12
+
+#define DMA_RX_ERR_CRC		BIT(1)
+#define DMA_RX_ERR_DRIB		BIT(2)
+#define DMA_RX_ERR_MII		BIT(3)
+#define DMA_RX_EV2		BIT(5)
+#define DMA_RX_ERR_COL		BIT(6)
+#define DMA_RX_LONG		BIT(7)
+#define DMA_RX_LS		BIT(8)	/* last descriptor */
+#define DMA_RX_FS		BIT(9)	/* first descriptor */
+#define DMA_RX_MF		BIT(10)	/* multicast frame */
+#define DMA_RX_ERR_RUNT		BIT(11)	/* runt frame */
+#define DMA_RX_ERR_LENGTH	BIT(12)	/* length error */
+#define DMA_RX_ERR_DESC		BIT(14)	/* descriptor error */
+#define DMA_RX_ERROR		BIT(15)	/* error summary */
+#define DMA_RX_LEN_MASK		0x3fff0000
+#define DMA_RX_LEN_SHIFT	16
+#define DMA_RX_FILT		BIT(30)
+#define DMA_RX_OWN		BIT(31)	/* desc owned by DMA controller */
+
+#define DMA_RX1_BSIZE_MASK	0x000007ff
+#define DMA_RX1_BSIZE_SHIFT	0
+#define DMA_RX1_CHAINED		BIT(24)
+#define DMA_RX1_RER		BIT(25)
+
+#define DMA_TX_ERR_UNDER	BIT(1)	/* underflow error */
+#define DMA_TX_ERR_DEFER	BIT(2)	/* excessive deferral */
+#define DMA_TX_COL_MASK		0x78
+#define DMA_TX_COL_SHIFT	3
+#define DMA_TX_ERR_HB		BIT(7)	/* hearbeat failure */
+#define DMA_TX_ERR_COL		BIT(8)	/* excessive collisions */
+#define DMA_TX_ERR_LATE		BIT(9)	/* late collision */
+#define DMA_TX_ERR_LINK		BIT(10)	/* no carrier */
+#define DMA_TX_ERR_LOSS		BIT(11)	/* loss of carrier */
+#define DMA_TX_ERR_JABBER	BIT(14)	/* transmit jabber timeout */
+#define DMA_TX_ERROR		BIT(15)	/* frame aborted */
+#define DMA_TX_OWN		BIT(31)	/* descr owned by DMA controller */
+
+#define DMA_TX1_BSIZE_MASK	0x000007ff
+#define DMA_TX1_BSIZE_SHIFT	0
+#define DMA_TX1_CHAINED		BIT(24)	/* chained descriptors */
+#define DMA_TX1_TER		BIT(25)	/* transmit end of ring */
+#define DMA_TX1_FS		BIT(29)	/* first segment */
+#define DMA_TX1_LS		BIT(30)	/* last segment */
+#define DMA_TX1_IC		BIT(31)	/* interrupt on completion */
+
+#define RCVPKT_LENGTH(X)	(X  >> 16)	/* Received pkt Length */
+
+#define MAC_CONTROL_RE		BIT(2)	/* receive enable */
+#define MAC_CONTROL_TE		BIT(3)	/* transmit enable */
+#define MAC_CONTROL_DC		BIT(5)	/* Deferral check */
+#define MAC_CONTROL_ASTP	BIT(8)	/* Auto pad strip */
+#define MAC_CONTROL_DRTY	BIT(10)	/* Disable retry */
+#define MAC_CONTROL_DBF		BIT(11)	/* Disable bcast frames */
+#define MAC_CONTROL_LCC		BIT(12)	/* late collision ctrl */
+#define MAC_CONTROL_HP		BIT(13)	/* Hash Perfect filtering */
+#define MAC_CONTROL_HASH	BIT(14)	/* Unicast hash filtering */
+#define MAC_CONTROL_HO		BIT(15)	/* Hash only filtering */
+#define MAC_CONTROL_PB		BIT(16)	/* Pass Bad frames */
+#define MAC_CONTROL_IF		BIT(17)	/* Inverse filtering */
+#define MAC_CONTROL_PR		BIT(18)	/* promiscuous mode (valid frames only) */
+#define MAC_CONTROL_PM		BIT(19)	/* pass multicast */
+#define MAC_CONTROL_F		BIT(20)	/* full-duplex */
+#define MAC_CONTROL_DRO		BIT(23)	/* Disable Receive Own */
+#define MAC_CONTROL_HBD		BIT(28)	/* heart-beat disabled (MUST BE SET) */
+#define MAC_CONTROL_BLE		BIT(30)	/* big endian mode */
+#define MAC_CONTROL_RA		BIT(31)	/* receive all (valid and invalid frames) */
+
+#define MII_ADDR_BUSY		BIT(0)
+#define MII_ADDR_WRITE		BIT(1)
+#define MII_ADDR_REG_SHIFT	6
+#define MII_ADDR_PHY_SHIFT	11
+#define MII_DATA_SHIFT		0
+
+#define FLOW_CONTROL_FCE	BIT(1)
+
+#define DMA_BUS_MODE_SWR	BIT(0)	/* software reset */
+#define DMA_BUS_MODE_BLE	BIT(7)	/* big endian mode */
+#define DMA_BUS_MODE_PBL_SHIFT	8	/* programmable burst length 32 */
+#define DMA_BUS_MODE_DBO	BIT(20)	/* big-endian descriptors */
+
+#define DMA_STATUS_TI		BIT(0)	/* transmit interrupt */
+#define DMA_STATUS_TPS		BIT(1)	/* transmit process stopped */
+#define DMA_STATUS_TU		BIT(2)	/* transmit buffer unavailable */
+#define DMA_STATUS_TJT		BIT(3)	/* transmit buffer timeout */
+#define DMA_STATUS_UNF		BIT(5)	/* transmit underflow */
+#define DMA_STATUS_RI		BIT(6)	/* receive interrupt */
+#define DMA_STATUS_RU		BIT(7)	/* receive buffer unavailable */
+#define DMA_STATUS_RPS		BIT(8)	/* receive process stopped */
+#define DMA_STATUS_ETI		BIT(10)	/* early transmit interrupt */
+#define DMA_STATUS_FBE		BIT(13)	/* fatal bus interrupt */
+#define DMA_STATUS_ERI		BIT(14)	/* early receive interrupt */
+#define DMA_STATUS_AIS		BIT(15)	/* abnormal interrupt summary */
+#define DMA_STATUS_NIS		BIT(16)	/* normal interrupt summary */
+#define DMA_STATUS_RS_SHIFT	17	/* receive process state */
+#define DMA_STATUS_TS_SHIFT	20	/* transmit process state */
+#define DMA_STATUS_EB_SHIFT	23	/* error bits */
+
+#define DMA_CONTROL_SR		BIT(1)	/* start receive */
+#define DMA_CONTROL_ST		BIT(13)	/* start transmit */
+#define DMA_CONTROL_SF		BIT(21)	/* store and forward */
+
+
+typedef struct {
+	volatile unsigned int status;	// OWN, Device control and status.
+	volatile unsigned int devcs;	// pkt Control bits + Length
+	volatile unsigned int addr;	// Current Address.
+	volatile unsigned int descr;	// Next descriptor in chain.
+} ar231x_descr_t;
+
+
+
+//
+// New Combo structure for Both Eth0 AND eth1
+//
+typedef struct {
+	volatile unsigned int mac_control;	/* 0x00 */
+	volatile unsigned int mac_addr[2];	/* 0x04 - 0x08 */
+	volatile unsigned int mcast_table[2];	/* 0x0c - 0x10 */
+	volatile unsigned int mii_addr;	/* 0x14 */
+	volatile unsigned int mii_data;	/* 0x18 */
+	volatile unsigned int flow_control;	/* 0x1c */
+	volatile unsigned int vlan_tag;	/* 0x20 */
+	volatile unsigned int pad[7];	/* 0x24 - 0x3c */
+	volatile unsigned int ucast_table[8];	/* 0x40-0x5c */
+
+} ETHERNET_STRUCT;
+
+/********************************************************************
+ * Interrupt controller
+ ********************************************************************/
+
+typedef struct {
+	volatile unsigned int wdog_control;	/* 0x08 */
+	volatile unsigned int wdog_timer;	/* 0x0c */
+	volatile unsigned int misc_status;	/* 0x10 */
+	volatile unsigned int misc_mask;	/* 0x14 */
+	volatile unsigned int global_status;	/* 0x18 */
+	volatile unsigned int reserved;	/* 0x1c */
+	volatile unsigned int reset_control;	/* 0x20 */
+} INTERRUPT;
+
+/********************************************************************
+ * DMA controller
+ ********************************************************************/
+typedef struct {
+	volatile unsigned int bus_mode;	/* 0x00 (CSR0) */
+	volatile unsigned int xmt_poll;	/* 0x04 (CSR1) */
+	volatile unsigned int rcv_poll;	/* 0x08 (CSR2) */
+	volatile unsigned int rcv_base;	/* 0x0c (CSR3) */
+	volatile unsigned int xmt_base;	/* 0x10 (CSR4) */
+	volatile unsigned int status;	/* 0x14 (CSR5) */
+	volatile unsigned int control;	/* 0x18 (CSR6) */
+	volatile unsigned int intr_ena;	/* 0x1c (CSR7) */
+	volatile unsigned int rcv_missed;	/* 0x20 (CSR8) */
+	volatile unsigned int reserved[11];	/* 0x24-0x4c (CSR9-19) */
+	volatile unsigned int cur_tx_buf_addr;	/* 0x50 (CSR20) */
+	volatile unsigned int cur_rx_buf_addr;	/* 0x50 (CSR21) */
+} DMA;
+
+/*
+ * Struct private for the Sibyte.
+ *
+ * Elements are grouped so variables used by the tx handling goes
+ * together, and will go into the same cache lines etc. in order to
+ * avoid cache line contention between the rx and tx handling on SMP.
+ *
+ * Frequently accessed variables are put at the beginning of the
+ * struct to help the compiler generate better/shorter code.
+ */
+struct ar231x_private {
+	struct net_device *dev;
+	int version;
+	u32 mb[2];
+
+	volatile ETHERNET_STRUCT *phy_regs;
+	volatile ETHERNET_STRUCT *eth_regs;
+	volatile DMA *dma_regs;
+	volatile u32 *int_regs;
+	struct ar231x_eth *cfg;
+
+	spinlock_t lock;			/* Serialise access to device */
+
+	/*
+	 * RX and TX descriptors, must be adjacent
+	 */
+	ar231x_descr_t *rx_ring;
+	ar231x_descr_t *tx_ring;
+
+
+	struct sk_buff **rx_skb;
+	struct sk_buff **tx_skb;
+
+	/*
+	 * RX elements
+	 */
+	u32 rx_skbprd;
+	u32 cur_rx;
+
+	/*
+	 * TX elements
+	 */
+	u32 tx_prd;
+	u32 tx_csm;
+
+	/*
+	 * Misc elements
+	 */
+	char name[48];
+	struct {
+		u32 address;
+		u32 length;
+		char *mapping;
+	} desc;
+
+
+	struct timer_list link_timer;
+	unsigned short phy;			/* merlot phy = 1, samsung phy = 0x1f */
+	unsigned short mac;
+	unsigned short link;		/* 0 - link down, 1 - link up */
+	u16 phyData;
+
+	struct tasklet_struct rx_tasklet;
+	int unloading;
+
+	struct phy_device *phy_dev;
+	struct mii_bus *mii_bus;
+	int oldduplex;
+};
+
+
+/*
+ * Prototypes
+ */
+static int ar231x_init(struct net_device *dev);
+#ifdef TX_TIMEOUT
+static void ar231x_tx_timeout(struct net_device *dev);
+#endif
+static int ar231x_restart(struct net_device *dev);
+static void ar231x_load_rx_ring(struct net_device *dev, int bufs);
+static irqreturn_t ar231x_interrupt(int irq, void *dev_id);
+static int ar231x_open(struct net_device *dev);
+static int ar231x_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static int ar231x_close(struct net_device *dev);
+static int ar231x_ioctl(struct net_device *dev, struct ifreq *ifr,
+						int cmd);
+static void ar231x_init_cleanup(struct net_device *dev);
+static int ar231x_setup_timer(struct net_device *dev);
+static void ar231x_link_timer_fn(unsigned long data);
+static void ar231x_check_link(struct net_device *dev);
+#endif							/* _AR2313_H_ */