aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/arm/at91_ether.c
blob: 152fa7a042b8c16cc736dc4197d028cbc2ff85fa (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
/*
 * Ethernet driver for the Atmel AT91RM9200 (Thunder)
 *
 *  Copyright (C) 2003 SAN People (Pty) Ltd
 *
 * Based on an earlier Atmel EMAC macrocell driver by Atmel and Lineo Inc.
 * Initial version by Rick Bronson 01/11/2003
 *
 * Intel LXT971A PHY support by Christopher Bahns & David Knickerbocker
 *   (Polaroid Corporation)
 *
 * Realtek RTL8201(B)L PHY support by Roman Avramenko <roman@imsystems.ru>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/mii.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/dma-mapping.h>
#include <linux/ethtool.h>
#include <linux/platform_device.h>
#include <linux/clk.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/mach-types.h>

#include <asm/arch/at91rm9200_emac.h>
#include <asm/arch/gpio.h>
#include <asm/arch/board.h>

#include "at91_ether.h"

#define DRV_NAME	"at91_ether"
#define DRV_VERSION	"1.0"

#define LINK_POLL_INTERVAL	(HZ)

/* ..................................................................... */

/*
 * Read from a EMAC register.
 */
static inline unsigned long at91_emac_read(unsigned int reg)
{
	void __iomem *emac_base = (void __iomem *)AT91_VA_BASE_EMAC;

	return __raw_readl(emac_base + reg);
}

/*
 * Write to a EMAC register.
 */
static inline void at91_emac_write(unsigned int reg, unsigned long value)
{
	void __iomem *emac_base = (void __iomem *)AT91_VA_BASE_EMAC;

	__raw_writel(value, emac_base + reg);
}

/* ........................... PHY INTERFACE ........................... */

/*
 * Enable the MDIO bit in MAC control register
 * When not called from an interrupt-handler, access to the PHY must be
 *  protected by a spinlock.
 */
static void enable_mdi(void)
{
	unsigned long ctl;

	ctl = at91_emac_read(AT91_EMAC_CTL);
	at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_MPE);	/* enable management port */
}

/*
 * Disable the MDIO bit in the MAC control register
 */
static void disable_mdi(void)
{
	unsigned long ctl;

	ctl = at91_emac_read(AT91_EMAC_CTL);
	at91_emac_write(AT91_EMAC_CTL, ctl & ~AT91_EMAC_MPE);	/* disable management port */
}

/*
 * Wait until the PHY operation is complete.
 */
static inline void at91_phy_wait(void) {
	unsigned long timeout = jiffies + 2;

	while (!(at91_emac_read(AT91_EMAC_SR) & AT91_EMAC_SR_IDLE)) {
		if (time_after(jiffies, timeout)) {
			printk("at91_ether: MIO timeout\n");
			break;
		}
		cpu_relax();
	}
}

/*
 * Write value to the a PHY register
 * Note: MDI interface is assumed to already have been enabled.
 */
static void write_phy(unsigned char phy_addr, unsigned char address, unsigned int value)
{
	at91_emac_write(AT91_EMAC_MAN, AT91_EMAC_MAN_802_3 | AT91_EMAC_RW_W
		| ((phy_addr & 0x1f) << 23) | (address << 18) | (value & AT91_EMAC_DATA));

	/* Wait until IDLE bit in Network Status register is cleared */
	at91_phy_wait();
}

/*
 * Read value stored in a PHY register.
 * Note: MDI interface is assumed to already have been enabled.
 */
static void read_phy(unsigned char phy_addr, unsigned char address, unsigned int *value)
{
	at91_emac_write(AT91_EMAC_MAN, AT91_EMAC_MAN_802_3 | AT91_EMAC_RW_R
		| ((phy_addr & 0x1f) << 23) | (address << 18));

	/* Wait until IDLE bit in Network Status register is cleared */
	at91_phy_wait();

	*value = at91_emac_read(AT91_EMAC_MAN) & AT91_EMAC_DATA;
}

/* ........................... PHY MANAGEMENT .......................... */

/*
 * Access the PHY to determine the current link speed and mode, and update the
 * MAC accordingly.
 * If no link or auto-negotiation is busy, then no changes are made.
 */
static void update_linkspeed(struct net_device *dev, int silent)
{
	struct at91_private *lp = netdev_priv(dev);
	unsigned int bmsr, bmcr, lpa, mac_cfg;
	unsigned int speed, duplex;

	if (!mii_link_ok(&lp->mii)) {		/* no link */
		netif_carrier_off(dev);
		if (!silent)
			printk(KERN_INFO "%s: Link down.\n", dev->name);
		return;
	}

	/* Link up, or auto-negotiation still in progress */
	read_phy(lp->phy_address, MII_BMSR, &bmsr);
	read_phy(lp->phy_address, MII_BMCR, &bmcr);
	if (bmcr & BMCR_ANENABLE) {				/* AutoNegotiation is enabled */
		if (!(bmsr & BMSR_ANEGCOMPLETE))
			return;			/* Do nothing - another interrupt generated when negotiation complete */

		read_phy(lp->phy_address, MII_LPA, &lpa);
		if ((lpa & LPA_100FULL) || (lpa & LPA_100HALF)) speed = SPEED_100;
		else speed = SPEED_10;
		if ((lpa & LPA_100FULL) || (lpa & LPA_10FULL)) duplex = DUPLEX_FULL;
		else duplex = DUPLEX_HALF;
	} else {
		speed = (bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10;
		duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
	}

	/* Update the MAC */
	mac_cfg = at91_emac_read(AT91_EMAC_CFG) & ~(AT91_EMAC_SPD | AT91_EMAC_FD);
	if (speed == SPEED_100) {
		if (duplex == DUPLEX_FULL)		/* 100 Full Duplex */
			mac_cfg |= AT91_EMAC_SPD | AT91_EMAC_FD;
		else					/* 100 Half Duplex */
			mac_cfg |= AT91_EMAC_SPD;
	} else {
		if (duplex == DUPLEX_FULL)		/* 10 Full Duplex */
			mac_cfg |= AT91_EMAC_FD;
		else {}					/* 10 Half Duplex */
	}
	at91_emac_write(AT91_EMAC_CFG, mac_cfg);

	if (!silent)
		printk(KERN_INFO "%s: Link now %i-%s\n", dev->name, speed, (duplex == DUPLEX_FULL) ? "FullDuplex" : "HalfDuplex");
	netif_carrier_on(dev);
}

/*
 * Handle interrupts from the PHY
 */
static irqreturn_t at91ether_phy_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *) dev_id;
	struct at91_private *lp = netdev_priv(dev);
	unsigned int phy;

	/*
	 * This hander is triggered on both edges, but the PHY chips expect
	 * level-triggering.  We therefore have to check if the PHY actually has
	 * an IRQ pending.
	 */
	enable_mdi();
	if ((lp->phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) {
		read_phy(lp->phy_address, MII_DSINTR_REG, &phy);	/* ack interrupt in Davicom PHY */
		if (!(phy & (1 << 0)))
			goto done;
	}
	else if (lp->phy_type == MII_LXT971A_ID) {
		read_phy(lp->phy_address, MII_ISINTS_REG, &phy);	/* ack interrupt in Intel PHY */
		if (!(phy & (1 << 2)))
			goto done;
	}
	else if (lp->phy_type == MII_BCM5221_ID) {
		read_phy(lp->phy_address, MII_BCMINTR_REG, &phy);	/* ack interrupt in Broadcom PHY */
		if (!(phy & (1 << 0)))
			goto done;
	}
	else if (lp->phy_type == MII_KS8721_ID) {
		read_phy(lp->phy_address, MII_TPISTATUS, &phy);		/* ack interrupt in Micrel PHY */
		if (!(phy & ((1 << 2) | 1)))
			goto done;
	}

	update_linkspeed(dev, 0);

done:
	disable_mdi();

	return IRQ_HANDLED;
}

/*
 * Initialize and enable the PHY interrupt for link-state changes
 */
static void enable_phyirq(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	unsigned int dsintr, irq_number;
	int status;

	irq_number = lp->board_data.phy_irq_pin;
	if (!irq_number) {
		/*
		 * PHY doesn't have an IRQ pin (RTL8201, DP83847, AC101L),
		 * or board does not have it connected.
		 */
		mod_timer(&lp->check_timer, jiffies + LINK_POLL_INTERVAL);
		return;
	}

	status = request_irq(irq_number, at91ether_phy_interrupt, 0, dev->name, dev);
	if (status) {
		printk(KERN_ERR "at91_ether: PHY IRQ %d request failed - status %d!\n", irq_number, status);
		return;
	}

	spin_lock_irq(&lp->lock);
	enable_mdi();

	if ((lp->phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) {	/* for Davicom PHY */
		read_phy(lp->phy_address, MII_DSINTR_REG, &dsintr);
		dsintr = dsintr & ~0xf00;		/* clear bits 8..11 */
		write_phy(lp->phy_address, MII_DSINTR_REG, dsintr);
	}
	else if (lp->phy_type == MII_LXT971A_ID) {	/* for Intel PHY */
		read_phy(lp->phy_address, MII_ISINTE_REG, &dsintr);
		dsintr = dsintr | 0xf2;			/* set bits 1, 4..7 */
		write_phy(lp->phy_address, MII_ISINTE_REG, dsintr);
	}
	else if (lp->phy_type == MII_BCM5221_ID) {	/* for Broadcom PHY */
		dsintr = (1 << 15) | ( 1 << 14);
		write_phy(lp->phy_address, MII_BCMINTR_REG, dsintr);
	}
	else if (lp->phy_type == MII_KS8721_ID) {	/* for Micrel PHY */
		dsintr = (1 << 10) | ( 1 << 8);
		write_phy(lp->phy_address, MII_TPISTATUS, dsintr);
	}

	disable_mdi();
	spin_unlock_irq(&lp->lock);
}

/*
 * Disable the PHY interrupt
 */
static void disable_phyirq(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	unsigned int dsintr;
	unsigned int irq_number;

	irq_number = lp->board_data.phy_irq_pin;
	if (!irq_number) {
		del_timer_sync(&lp->check_timer);
		return;
	}

	spin_lock_irq(&lp->lock);
	enable_mdi();

	if ((lp->phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) {	/* for Davicom PHY */
		read_phy(lp->phy_address, MII_DSINTR_REG, &dsintr);
		dsintr = dsintr | 0xf00;			/* set bits 8..11 */
		write_phy(lp->phy_address, MII_DSINTR_REG, dsintr);
	}
	else if (lp->phy_type == MII_LXT971A_ID) {	/* for Intel PHY */
		read_phy(lp->phy_address, MII_ISINTE_REG, &dsintr);
		dsintr = dsintr & ~0xf2;			/* clear bits 1, 4..7 */
		write_phy(lp->phy_address, MII_ISINTE_REG, dsintr);
	}
	else if (lp->phy_type == MII_BCM5221_ID) {	/* for Broadcom PHY */
		read_phy(lp->phy_address, MII_BCMINTR_REG, &dsintr);
		dsintr = ~(1 << 14);
		write_phy(lp->phy_address, MII_BCMINTR_REG, dsintr);
	}
	else if (lp->phy_type == MII_KS8721_ID) {	/* for Micrel PHY */
		read_phy(lp->phy_address, MII_TPISTATUS, &dsintr);
		dsintr = ~((1 << 10) | (1 << 8));
		write_phy(lp->phy_address, MII_TPISTATUS, dsintr);
	}

	disable_mdi();
	spin_unlock_irq(&lp->lock);

	free_irq(irq_number, dev);			/* Free interrupt handler */
}

/*
 * Perform a software reset of the PHY.
 */
#if 0
static void reset_phy(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	unsigned int bmcr;

	spin_lock_irq(&lp->lock);
	enable_mdi();

	/* Perform PHY reset */
	write_phy(lp->phy_address, MII_BMCR, BMCR_RESET);

	/* Wait until PHY reset is complete */
	do {
		read_phy(lp->phy_address, MII_BMCR, &bmcr);
	} while (!(bmcr && BMCR_RESET));

	disable_mdi();
	spin_unlock_irq(&lp->lock);
}
#endif

static void at91ether_check_link(unsigned long dev_id)
{
	struct net_device *dev = (struct net_device *) dev_id;
	struct at91_private *lp = netdev_priv(dev);

	enable_mdi();
	update_linkspeed(dev, 1);
	disable_mdi();

	mod_timer(&lp->check_timer, jiffies + LINK_POLL_INTERVAL);
}

/* ......................... ADDRESS MANAGEMENT ........................ */

/*
 * NOTE: Your bootloader must always set the MAC address correctly before
 * booting into Linux.
 *
 * - It must always set the MAC address after reset, even if it doesn't
 *   happen to access the Ethernet while it's booting.  Some versions of
 *   U-Boot on the AT91RM9200-DK do not do this.
 *
 * - Likewise it must store the addresses in the correct byte order.
 *   MicroMonitor (uMon) on the CSB337 does this incorrectly (and
 *   continues to do so, for bug-compatibility).
 */

static short __init unpack_mac_address(struct net_device *dev, unsigned int hi, unsigned int lo)
{
	char addr[6];

	if (machine_is_csb337()) {
		addr[5] = (lo & 0xff);			/* The CSB337 bootloader stores the MAC the wrong-way around */
		addr[4] = (lo & 0xff00) >> 8;
		addr[3] = (lo & 0xff0000) >> 16;
		addr[2] = (lo & 0xff000000) >> 24;
		addr[1] = (hi & 0xff);
		addr[0] = (hi & 0xff00) >> 8;
	}
	else {
		addr[0] = (lo & 0xff);
		addr[1] = (lo & 0xff00) >> 8;
		addr[2] = (lo & 0xff0000) >> 16;
		addr[3] = (lo & 0xff000000) >> 24;
		addr[4] = (hi & 0xff);
		addr[5] = (hi & 0xff00) >> 8;
	}

	if (is_valid_ether_addr(addr)) {
		memcpy(dev->dev_addr, &addr, 6);
		return 1;
	}
	return 0;
}

/*
 * Set the ethernet MAC address in dev->dev_addr
 */
static void __init get_mac_address(struct net_device *dev)
{
	/* Check Specific-Address 1 */
	if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA1H), at91_emac_read(AT91_EMAC_SA1L)))
		return;
	/* Check Specific-Address 2 */
	if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA2H), at91_emac_read(AT91_EMAC_SA2L)))
		return;
	/* Check Specific-Address 3 */
	if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA3H), at91_emac_read(AT91_EMAC_SA3L)))
		return;
	/* Check Specific-Address 4 */
	if (unpack_mac_address(dev, at91_emac_read(AT91_EMAC_SA4H), at91_emac_read(AT91_EMAC_SA4L)))
		return;

	printk(KERN_ERR "at91_ether: Your bootloader did not configure a MAC address.\n");
}

/*
 * Program the hardware MAC address from dev->dev_addr.
 */
static void update_mac_address(struct net_device *dev)
{
	at91_emac_write(AT91_EMAC_SA1L, (dev->dev_addr[3] << 24) | (dev->dev_addr[2] << 16) | (dev->dev_addr[1] << 8) | (dev->dev_addr[0]));
	at91_emac_write(AT91_EMAC_SA1H, (dev->dev_addr[5] << 8) | (dev->dev_addr[4]));

	at91_emac_write(AT91_EMAC_SA2L, 0);
	at91_emac_write(AT91_EMAC_SA2H, 0);
}

/*
 * Store the new hardware address in dev->dev_addr, and update the MAC.
 */
static int set_mac_address(struct net_device *dev, void* addr)
{
	struct sockaddr *address = addr;

	if (!is_valid_ether_addr(address->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(dev->dev_addr, address->sa_data, dev->addr_len);
	update_mac_address(dev);

	printk("%s: Setting MAC address to %02x:%02x:%02x:%02x:%02x:%02x\n", dev->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]);

	return 0;
}

static int inline hash_bit_value(int bitnr, __u8 *addr)
{
	if (addr[bitnr / 8] & (1 << (bitnr % 8)))
		return 1;
	return 0;
}

/*
 * The hash address register is 64 bits long and takes up two locations in the memory map.
 * The least significant bits are stored in EMAC_HSL and the most significant
 * bits in EMAC_HSH.
 *
 * The unicast hash enable and the multicast hash enable bits in the network configuration
 *  register enable the reception of hash matched frames. The destination address is
 *  reduced to a 6 bit index into the 64 bit hash register using the following hash function.
 * The hash function is an exclusive or of every sixth bit of the destination address.
 *   hash_index[5] = da[5] ^ da[11] ^ da[17] ^ da[23] ^ da[29] ^ da[35] ^ da[41] ^ da[47]
 *   hash_index[4] = da[4] ^ da[10] ^ da[16] ^ da[22] ^ da[28] ^ da[34] ^ da[40] ^ da[46]
 *   hash_index[3] = da[3] ^ da[09] ^ da[15] ^ da[21] ^ da[27] ^ da[33] ^ da[39] ^ da[45]
 *   hash_index[2] = da[2] ^ da[08] ^ da[14] ^ da[20] ^ da[26] ^ da[32] ^ da[38] ^ da[44]
 *   hash_index[1] = da[1] ^ da[07] ^ da[13] ^ da[19] ^ da[25] ^ da[31] ^ da[37] ^ da[43]
 *   hash_index[0] = da[0] ^ da[06] ^ da[12] ^ da[18] ^ da[24] ^ da[30] ^ da[36] ^ da[42]
 * da[0] represents the least significant bit of the first byte received, that is, the multicast/
 *  unicast indicator, and da[47] represents the most significant bit of the last byte
 *  received.
 * If the hash index points to a bit that is set in the hash register then the frame will be
 *  matched according to whether the frame is multicast or unicast.
 * A multicast match will be signalled if the multicast hash enable bit is set, da[0] is 1 and
 *  the hash index points to a bit set in the hash register.
 * A unicast match will be signalled if the unicast hash enable bit is set, da[0] is 0 and the
 *  hash index points to a bit set in the hash register.
 * To receive all multicast frames, the hash register should be set with all ones and the
 *  multicast hash enable bit should be set in the network configuration register.
 */

/*
 * Return the hash index value for the specified address.
 */
static int hash_get_index(__u8 *addr)
{
	int i, j, bitval;
	int hash_index = 0;

	for (j = 0; j < 6; j++) {
		for (i = 0, bitval = 0; i < 8; i++)
			bitval ^= hash_bit_value(i*6 + j, addr);

		hash_index |= (bitval << j);
	}

	return hash_index;
}

/*
 * Add multicast addresses to the internal multicast-hash table.
 */
static void at91ether_sethashtable(struct net_device *dev)
{
	struct dev_mc_list *curr;
	unsigned long mc_filter[2];
	unsigned int i, bitnr;

	mc_filter[0] = mc_filter[1] = 0;

	curr = dev->mc_list;
	for (i = 0; i < dev->mc_count; i++, curr = curr->next) {
		if (!curr) break;	/* unexpected end of list */

		bitnr = hash_get_index(curr->dmi_addr);
		mc_filter[bitnr >> 5] |= 1 << (bitnr & 31);
	}

	at91_emac_write(AT91_EMAC_HSH, mc_filter[0]);
	at91_emac_write(AT91_EMAC_HSL, mc_filter[1]);
}

/*
 * Enable/Disable promiscuous and multicast modes.
 */
static void at91ether_set_rx_mode(struct net_device *dev)
{
	unsigned long cfg;

	cfg = at91_emac_read(AT91_EMAC_CFG);

	if (dev->flags & IFF_PROMISC)			/* Enable promiscuous mode */
		cfg |= AT91_EMAC_CAF;
	else if (dev->flags & (~IFF_PROMISC))		/* Disable promiscuous mode */
		cfg &= ~AT91_EMAC_CAF;

	if (dev->flags & IFF_ALLMULTI) {		/* Enable all multicast mode */
		at91_emac_write(AT91_EMAC_HSH, -1);
		at91_emac_write(AT91_EMAC_HSL, -1);
		cfg |= AT91_EMAC_MTI;
	} else if (dev->mc_count > 0) {			/* Enable specific multicasts */
		at91ether_sethashtable(dev);
		cfg |= AT91_EMAC_MTI;
	} else if (dev->flags & (~IFF_ALLMULTI)) {	/* Disable all multicast mode */
		at91_emac_write(AT91_EMAC_HSH, 0);
		at91_emac_write(AT91_EMAC_HSL, 0);
		cfg &= ~AT91_EMAC_MTI;
	}

	at91_emac_write(AT91_EMAC_CFG, cfg);
}

/* ......................... ETHTOOL SUPPORT ........................... */

static int mdio_read(struct net_device *dev, int phy_id, int location)
{
	unsigned int value;

	read_phy(phy_id, location, &value);
	return value;
}

static void mdio_write(struct net_device *dev, int phy_id, int location, int value)
{
	write_phy(phy_id, location, value);
}

static int at91ether_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct at91_private *lp = netdev_priv(dev);
	int ret;

	spin_lock_irq(&lp->lock);
	enable_mdi();

	ret = mii_ethtool_gset(&lp->mii, cmd);

	disable_mdi();
	spin_unlock_irq(&lp->lock);

	if (lp->phy_media == PORT_FIBRE) {		/* override media type since mii.c doesn't know */
		cmd->supported = SUPPORTED_FIBRE;
		cmd->port = PORT_FIBRE;
	}

	return ret;
}

static int at91ether_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct at91_private *lp = netdev_priv(dev);
	int ret;

	spin_lock_irq(&lp->lock);
	enable_mdi();

	ret = mii_ethtool_sset(&lp->mii, cmd);

	disable_mdi();
	spin_unlock_irq(&lp->lock);

	return ret;
}

static int at91ether_nwayreset(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	int ret;

	spin_lock_irq(&lp->lock);
	enable_mdi();

	ret = mii_nway_restart(&lp->mii);

	disable_mdi();
	spin_unlock_irq(&lp->lock);

	return ret;
}

static void at91ether_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
	strlcpy(info->bus_info, dev->dev.parent->bus_id, sizeof(info->bus_info));
}

static const struct ethtool_ops at91ether_ethtool_ops = {
	.get_settings	= at91ether_get_settings,
	.set_settings	= at91ether_set_settings,
	.get_drvinfo	= at91ether_get_drvinfo,
	.nway_reset	= at91ether_nwayreset,
	.get_link	= ethtool_op_get_link,
};

static int at91ether_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct at91_private *lp = netdev_priv(dev);
	int res;

	if (!netif_running(dev))
		return -EINVAL;

	spin_lock_irq(&lp->lock);
	enable_mdi();
	res = generic_mii_ioctl(&lp->mii, if_mii(rq), cmd, NULL);
	disable_mdi();
	spin_unlock_irq(&lp->lock);

	return res;
}

/* ................................ MAC ................................ */

/*
 * Initialize and start the Receiver and Transmit subsystems
 */
static void at91ether_start(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	struct recv_desc_bufs *dlist, *dlist_phys;
	int i;
	unsigned long ctl;

	dlist = lp->dlist;
	dlist_phys = lp->dlist_phys;

	for (i = 0; i < MAX_RX_DESCR; i++) {
		dlist->descriptors[i].addr = (unsigned int) &dlist_phys->recv_buf[i][0];
		dlist->descriptors[i].size = 0;
	}

	/* Set the Wrap bit on the last descriptor */
	dlist->descriptors[i-1].addr |= EMAC_DESC_WRAP;

	/* Reset buffer index */
	lp->rxBuffIndex = 0;

	/* Program address of descriptor list in Rx Buffer Queue register */
	at91_emac_write(AT91_EMAC_RBQP, (unsigned long) dlist_phys);

	/* Enable Receive and Transmit */
	ctl = at91_emac_read(AT91_EMAC_CTL);
	at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_RE | AT91_EMAC_TE);
}

/*
 * Open the ethernet interface
 */
static int at91ether_open(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	unsigned long ctl;

	if (!is_valid_ether_addr(dev->dev_addr))
		return -EADDRNOTAVAIL;

	clk_enable(lp->ether_clk);		/* Re-enable Peripheral clock */

	/* Clear internal statistics */
	ctl = at91_emac_read(AT91_EMAC_CTL);
	at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_CSR);

	/* Update the MAC address (incase user has changed it) */
	update_mac_address(dev);

	/* Enable PHY interrupt */
	enable_phyirq(dev);

	/* Enable MAC interrupts */
	at91_emac_write(AT91_EMAC_IER, AT91_EMAC_RCOM | AT91_EMAC_RBNA
				| AT91_EMAC_TUND | AT91_EMAC_RTRY | AT91_EMAC_TCOM
				| AT91_EMAC_ROVR | AT91_EMAC_ABT);

	/* Determine current link speed */
	spin_lock_irq(&lp->lock);
	enable_mdi();
	update_linkspeed(dev, 0);
	disable_mdi();
	spin_unlock_irq(&lp->lock);

	at91ether_start(dev);
	netif_start_queue(dev);
	return 0;
}

/*
 * Close the interface
 */
static int at91ether_close(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	unsigned long ctl;

	/* Disable Receiver and Transmitter */
	ctl = at91_emac_read(AT91_EMAC_CTL);
	at91_emac_write(AT91_EMAC_CTL, ctl & ~(AT91_EMAC_TE | AT91_EMAC_RE));

	/* Disable PHY interrupt */
	disable_phyirq(dev);

	/* Disable MAC interrupts */
	at91_emac_write(AT91_EMAC_IDR, AT91_EMAC_RCOM | AT91_EMAC_RBNA
				| AT91_EMAC_TUND | AT91_EMAC_RTRY | AT91_EMAC_TCOM
				| AT91_EMAC_ROVR | AT91_EMAC_ABT);

	netif_stop_queue(dev);

	clk_disable(lp->ether_clk);		/* Disable Peripheral clock */

	return 0;
}

/*
 * Transmit packet.
 */
static int at91ether_tx(struct sk_buff *skb, struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);

	if (at91_emac_read(AT91_EMAC_TSR) & AT91_EMAC_TSR_BNQ) {
		netif_stop_queue(dev);

		/* Store packet information (to free when Tx completed) */
		lp->skb = skb;
		lp->skb_length = skb->len;
		lp->skb_physaddr = dma_map_single(NULL, skb->data, skb->len, DMA_TO_DEVICE);
		lp->stats.tx_bytes += skb->len;

		/* Set address of the data in the Transmit Address register */
		at91_emac_write(AT91_EMAC_TAR, lp->skb_physaddr);
		/* Set length of the packet in the Transmit Control register */
		at91_emac_write(AT91_EMAC_TCR, skb->len);

		dev->trans_start = jiffies;
	} else {
		printk(KERN_ERR "at91_ether.c: at91ether_tx() called, but device is busy!\n");
		return 1;	/* if we return anything but zero, dev.c:1055 calls kfree_skb(skb)
				on this skb, he also reports -ENETDOWN and printk's, so either
				we free and return(0) or don't free and return 1 */
	}

	return 0;
}

/*
 * Update the current statistics from the internal statistics registers.
 */
static struct net_device_stats *at91ether_stats(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	int ale, lenerr, seqe, lcol, ecol;

	if (netif_running(dev)) {
		lp->stats.rx_packets += at91_emac_read(AT91_EMAC_OK);		/* Good frames received */
		ale = at91_emac_read(AT91_EMAC_ALE);
		lp->stats.rx_frame_errors += ale;				/* Alignment errors */
		lenerr = at91_emac_read(AT91_EMAC_ELR) + at91_emac_read(AT91_EMAC_USF);
		lp->stats.rx_length_errors += lenerr;				/* Excessive Length or Undersize Frame error */
		seqe = at91_emac_read(AT91_EMAC_SEQE);
		lp->stats.rx_crc_errors += seqe;				/* CRC error */
		lp->stats.rx_fifo_errors += at91_emac_read(AT91_EMAC_DRFC);	/* Receive buffer not available */
		lp->stats.rx_errors += (ale + lenerr + seqe
			+ at91_emac_read(AT91_EMAC_CDE) + at91_emac_read(AT91_EMAC_RJB));

		lp->stats.tx_packets += at91_emac_read(AT91_EMAC_FRA);		/* Frames successfully transmitted */
		lp->stats.tx_fifo_errors += at91_emac_read(AT91_EMAC_TUE);	/* Transmit FIFO underruns */
		lp->stats.tx_carrier_errors += at91_emac_read(AT91_EMAC_CSE);	/* Carrier Sense errors */
		lp->stats.tx_heartbeat_errors += at91_emac_read(AT91_EMAC_SQEE);/* Heartbeat error */

		lcol = at91_emac_read(AT91_EMAC_LCOL);
		ecol = at91_emac_read(AT91_EMAC_ECOL);
		lp->stats.tx_window_errors += lcol;			/* Late collisions */
		lp->stats.tx_aborted_errors += ecol;			/* 16 collisions */

		lp->stats.collisions += (at91_emac_read(AT91_EMAC_SCOL) + at91_emac_read(AT91_EMAC_MCOL) + lcol + ecol);
	}
	return &lp->stats;
}

/*
 * Extract received frame from buffer descriptors and sent to upper layers.
 * (Called from interrupt context)
 */
static void at91ether_rx(struct net_device *dev)
{
	struct at91_private *lp = netdev_priv(dev);
	struct recv_desc_bufs *dlist;
	unsigned char *p_recv;
	struct sk_buff *skb;
	unsigned int pktlen;

	dlist = lp->dlist;
	while (dlist->descriptors[lp->rxBuffIndex].addr & EMAC_DESC_DONE) {
		p_recv = dlist->recv_buf[lp->rxBuffIndex];
		pktlen = dlist->descriptors[lp->rxBuffIndex].size & 0x7ff;	/* Length of frame including FCS */
		skb = dev_alloc_skb(pktlen + 2);
		if (skb != NULL) {
			skb_reserve(skb, 2);
			memcpy(skb_put(skb, pktlen), p_recv, pktlen);

			skb->protocol = eth_type_trans(skb, dev);
			dev->last_rx = jiffies;
			lp->stats.rx_bytes += pktlen;
			netif_rx(skb);
		}
		else {
			lp->stats.rx_dropped += 1;
			printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
		}

		if (dlist->descriptors[lp->rxBuffIndex].size & EMAC_MULTICAST)
			lp->stats.multicast++;

		dlist->descriptors[lp->rxBuffIndex].addr &= ~EMAC_DESC_DONE;	/* reset ownership bit */
		if (lp->rxBuffIndex == MAX_RX_DESCR-1)				/* wrap after last buffer */
			lp->rxBuffIndex = 0;
		else
			lp->rxBuffIndex++;
	}
}

/*
 * MAC interrupt handler
 */
static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *) dev_id;
	struct at91_private *lp = netdev_priv(dev);
	unsigned long intstatus, ctl;

	/* MAC Interrupt Status register indicates what interrupts are pending.
	   It is automatically cleared once read. */
	intstatus = at91_emac_read(AT91_EMAC_ISR);

	if (intstatus & AT91_EMAC_RCOM)		/* Receive complete */
		at91ether_rx(dev);

	if (intstatus & AT91_EMAC_TCOM) {	/* Transmit complete */
		/* The TCOM bit is set even if the transmission failed. */
		if (intstatus & (AT91_EMAC_TUND | AT91_EMAC_RTRY))
			lp->stats.tx_errors += 1;

		if (lp->skb) {
			dev_kfree_skb_irq(lp->skb);
			lp->skb = NULL;
			dma_unmap_single(NULL, lp->skb_physaddr, lp->skb_length, DMA_TO_DEVICE);
		}
		netif_wake_queue(dev);
	}

	/* Work-around for Errata #11 */
	if (intstatus & AT91_EMAC_RBNA) {
		ctl = at91_emac_read(AT91_EMAC_CTL);
		at91_emac_write(AT91_EMAC_CTL, ctl & ~AT91_EMAC_RE);
		at91_emac_write(AT91_EMAC_CTL, ctl | AT91_EMAC_RE);
	}

	if (intstatus & AT91_EMAC_ROVR)
		printk("%s: ROVR error\n", dev->name);

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void at91ether_poll_controller(struct net_device *dev)
{
	unsigned long flags;

	local_irq_save(flags);
	at91ether_interrupt(dev->irq, dev);
	local_irq_restore(flags);
}
#endif

/*
 * Initialize the ethernet interface
 */
static int __init at91ether_setup(unsigned long phy_type, unsigned short phy_address,
			struct platform_device *pdev, struct clk *ether_clk)
{
	struct at91_eth_data *board_data = pdev->dev.platform_data;
	struct net_device *dev;
	struct at91_private *lp;
	unsigned int val;
	int res;

	dev = alloc_etherdev(sizeof(struct at91_private));
	if (!dev)
		return -ENOMEM;

	dev->base_addr = AT91_VA_BASE_EMAC;
	dev->irq = AT91RM9200_ID_EMAC;
	SET_MODULE_OWNER(dev);

	/* Install the interrupt handler */
	if (request_irq(dev->irq, at91ether_interrupt, 0, dev->name, dev)) {
		free_netdev(dev);
		return -EBUSY;
	}

	/* Allocate memory for DMA Receive descriptors */
	lp = netdev_priv(dev);
	lp->dlist = (struct recv_desc_bufs *) dma_alloc_coherent(NULL, sizeof(struct recv_desc_bufs), (dma_addr_t *) &lp->dlist_phys, GFP_KERNEL);
	if (lp->dlist == NULL) {
		free_irq(dev->irq, dev);
		free_netdev(dev);
		return -ENOMEM;
	}
	lp->board_data = *board_data;
	lp->ether_clk = ether_clk;
	platform_set_drvdata(pdev, dev);

	spin_lock_init(&lp->lock);

	ether_setup(dev);
	dev->open = at91ether_open;
	dev->stop = at91ether_close;
	dev->hard_start_xmit = at91ether_tx;
	dev->get_stats = at91ether_stats;
	dev->set_multicast_list = at91ether_set_rx_mode;
	dev->set_mac_address = set_mac_address;
	dev->ethtool_ops = &at91ether_ethtool_ops;
	dev->do_ioctl = at91ether_ioctl;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = at91ether_poll_controller;
#endif

	SET_NETDEV_DEV(dev, &pdev->dev);

	get_mac_address(dev);		/* Get ethernet address and store it in dev->dev_addr */
	update_mac_address(dev);	/* Program ethernet address into MAC */

	at91_emac_write(AT91_EMAC_CTL, 0);

	if (lp->board_data.is_rmii)
		at91_emac_write(AT91_EMAC_CFG, AT91_EMAC_CLK_DIV32 | AT91_EMAC_BIG | AT91_EMAC_RMII);
	else
		at91_emac_write(AT91_EMAC_CFG, AT91_EMAC_CLK_DIV32 | AT91_EMAC_BIG);

	/* Perform PHY-specific initialization */
	spin_lock_irq(&lp->lock);
	enable_mdi();
	if ((phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID)) {
		read_phy(phy_address, MII_DSCR_REG, &val);
		if ((val & (1 << 10)) == 0)			/* DSCR bit 10 is 0 -- fiber mode */
			lp->phy_media = PORT_FIBRE;
	} else if (machine_is_csb337()) {
		/* mix link activity status into LED2 link state */
		write_phy(phy_address, MII_LEDCTRL_REG, 0x0d22);
	}
	disable_mdi();
	spin_unlock_irq(&lp->lock);

	lp->mii.dev = dev;		/* Support for ethtool */
	lp->mii.mdio_read = mdio_read;
	lp->mii.mdio_write = mdio_write;
	lp->mii.phy_id = phy_address;
	lp->mii.phy_id_mask = 0x1f;
	lp->mii.reg_num_mask = 0x1f;

	lp->phy_type = phy_type;	/* Type of PHY connected */
	lp->phy_address = phy_address;	/* MDI address of PHY */

	/* Register the network interface */
	res = register_netdev(dev);
	if (res) {
		free_irq(dev->irq, dev);
		free_netdev(dev);
		dma_free_coherent(NULL, sizeof(struct recv_desc_bufs), lp->dlist, (dma_addr_t)lp->dlist_phys);
		return res;
	}

	/* Determine current link speed */
	spin_lock_irq(&lp->lock);
	enable_mdi();
	update_linkspeed(dev, 0);
	disable_mdi();
	spin_unlock_irq(&lp->lock);
	netif_carrier_off(dev);		/* will be enabled in open() */

	/* If board has no PHY IRQ, use a timer to poll the PHY */
	if (!lp->board_data.phy_irq_pin) {
		init_timer(&lp->check_timer);
		lp->check_timer.data = (unsigned long)dev;
		lp->check_timer.function = at91ether_check_link;
	}

	/* Display ethernet banner */
	printk(KERN_INFO "%s: AT91 ethernet at 0x%08x int=%d %s%s (%02x:%02x:%02x:%02x:%02x:%02x)\n",
		dev->name, (uint) dev->base_addr, dev->irq,
		at91_emac_read(AT91_EMAC_CFG) & AT91_EMAC_SPD ? "100-" : "10-",
		at91_emac_read(AT91_EMAC_CFG) & AT91_EMAC_FD ? "FullDuplex" : "HalfDuplex",
		dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2],
		dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]);
	if ((phy_type == MII_DM9161_ID) || (lp->phy_type == MII_DM9161A_ID))
		printk(KERN_INFO "%s: Davicom 9161 PHY %s\n", dev->name, (lp->phy_media == PORT_FIBRE) ? "(Fiber)" : "(Copper)");
	else if (phy_type == MII_LXT971A_ID)
		printk(KERN_INFO "%s: Intel LXT971A PHY\n", dev->name);
	else if (phy_type == MII_RTL8201_ID)
		printk(KERN_INFO "%s: Realtek RTL8201(B)L PHY\n", dev->name);
	else if (phy_type == MII_BCM5221_ID)
		printk(KERN_INFO "%s: Broadcom BCM5221 PHY\n", dev->name);
	else if (phy_type == MII_DP83847_ID)
		printk(KERN_INFO "%s: National Semiconductor DP83847 PHY\n", dev->name);
	else if (phy_type == MII_AC101L_ID)
		printk(KERN_INFO "%s: Altima AC101L PHY\n", dev->name);
	else if (phy_type == MII_KS8721_ID)
		printk(KERN_INFO "%s: Micrel KS8721 PHY\n", dev->name);

	return 0;
}

/*
 * Detect MAC and PHY and perform initialization
 */
static int __init at91ether_probe(struct platform_device *pdev)
{
	unsigned int phyid1, phyid2;
	int detected = -1;
	unsigned long phy_id;
	unsigned short phy_address = 0;
	struct clk *ether_clk;

	ether_clk = clk_get(&pdev->dev, "ether_clk");
	if (IS_ERR(ether_clk)) {
		printk(KERN_ERR "at91_ether: no clock defined\n");
		return -ENODEV;
	}
	clk_enable(ether_clk);					/* Enable Peripheral clock */

	while ((detected != 0) && (phy_address < 32)) {
		/* Read the PHY ID registers */
		enable_mdi();
		read_phy(phy_address, MII_PHYSID1, &phyid1);
		read_phy(phy_address, MII_PHYSID2, &phyid2);
		disable_mdi();

		phy_id = (phyid1 << 16) | (phyid2 & 0xfff0);
		switch (phy_id) {
			case MII_DM9161_ID:		/* Davicom 9161: PHY_ID1 = 0x181, PHY_ID2 = B881 */
			case MII_DM9161A_ID:		/* Davicom 9161A: PHY_ID1 = 0x181, PHY_ID2 = B8A0 */
			case MII_LXT971A_ID:		/* Intel LXT971A: PHY_ID1 = 0x13, PHY_ID2 = 78E0 */
			case MII_RTL8201_ID:		/* Realtek RTL8201: PHY_ID1 = 0, PHY_ID2 = 0x8201 */
			case MII_BCM5221_ID:		/* Broadcom BCM5221: PHY_ID1 = 0x40, PHY_ID2 = 0x61e0 */
			case MII_DP83847_ID:		/* National Semiconductor DP83847:  */
			case MII_AC101L_ID:		/* Altima AC101L: PHY_ID1 = 0x22, PHY_ID2 = 0x5520 */
			case MII_KS8721_ID:		/* Micrel KS8721: PHY_ID1 = 0x22, PHY_ID2 = 0x1610 */
				detected = at91ether_setup(phy_id, phy_address, pdev, ether_clk);
				break;
		}

		phy_address++;
	}

	clk_disable(ether_clk);					/* Disable Peripheral clock */

	return detected;
}

static int __devexit at91ether_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);
	struct at91_private *lp = netdev_priv(dev);

	unregister_netdev(dev);
	free_irq(dev->irq, dev);
	dma_free_coherent(NULL, sizeof(struct recv_desc_bufs), lp->dlist, (dma_addr_t)lp->dlist_phys);
	clk_put(lp->ether_clk);

	platform_set_drvdata(pdev, NULL);
	free_netdev(dev);
	return 0;
}

#ifdef CONFIG_PM

static int at91ether_suspend(struct platform_device *pdev, pm_message_t mesg)
{
	struct net_device *net_dev = platform_get_drvdata(pdev);
	struct at91_private *lp = netdev_priv(net_dev);
	int phy_irq = lp->board_data.phy_irq_pin;

	if (netif_running(net_dev)) {
		if (phy_irq)
			disable_irq(phy_irq);

		netif_stop_queue(net_dev);
		netif_device_detach(net_dev);

		clk_disable(lp->ether_clk);
	}
	return 0;
}

static int at91ether_resume(struct platform_device *pdev)
{
	struct net_device *net_dev = platform_get_drvdata(pdev);
	struct at91_private *lp = netdev_priv(net_dev);
	int phy_irq = lp->board_data.phy_irq_pin;

	if (netif_running(net_dev)) {
		clk_enable(lp->ether_clk);

		netif_device_attach(net_dev);
		netif_start_queue(net_dev);

		if (phy_irq)
			enable_irq(phy_irq);
	}
	return 0;
}

#else
#define at91ether_suspend	NULL
#define at91ether_resume	NULL
#endif

static struct platform_driver at91ether_driver = {
	.probe		= at91ether_probe,
	.remove		= __devexit_p(at91ether_remove),
	.suspend	= at91ether_suspend,
	.resume		= at91ether_resume,
	.driver		= {
		.name	= DRV_NAME,
		.owner	= THIS_MODULE,
	},
};

static int __init at91ether_init(void)
{
	return platform_driver_register(&at91ether_driver);
}

static void __exit at91ether_exit(void)
{
	platform_driver_unregister(&at91ether_driver);
}

module_init(at91ether_init)
module_exit(at91ether_exit)

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("AT91RM9200 EMAC Ethernet driver");
MODULE_AUTHOR("Andrew Victor");