summaryrefslogtreecommitdiffstats
path: root/drivers/net/arm/w90p910_ether.c
blob: 2e852463382b3e166db62dfde492ba7d5141dd78 (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
/*
 * Copyright (c) 2008-2009 Nuvoton technology corporation.
 *
 * Wan ZongShun <mcuos.com@gmail.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;version 2 of the License.
 *
 */

#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/ethtool.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/gfp.h>

#define DRV_MODULE_NAME		"w90p910-emc"
#define DRV_MODULE_VERSION	"0.1"

/* Ethernet MAC Registers */
#define REG_CAMCMR		0x00
#define REG_CAMEN		0x04
#define REG_CAMM_BASE		0x08
#define REG_CAML_BASE		0x0c
#define REG_TXDLSA		0x88
#define REG_RXDLSA		0x8C
#define REG_MCMDR		0x90
#define REG_MIID		0x94
#define REG_MIIDA		0x98
#define REG_FFTCR		0x9C
#define REG_TSDR		0xa0
#define REG_RSDR		0xa4
#define REG_DMARFC		0xa8
#define REG_MIEN		0xac
#define REG_MISTA		0xb0
#define REG_CTXDSA		0xcc
#define REG_CTXBSA		0xd0
#define REG_CRXDSA		0xd4
#define REG_CRXBSA		0xd8

/* mac controller bit */
#define MCMDR_RXON		0x01
#define MCMDR_ACP		(0x01 << 3)
#define MCMDR_SPCRC		(0x01 << 5)
#define MCMDR_TXON		(0x01 << 8)
#define MCMDR_FDUP		(0x01 << 18)
#define MCMDR_ENMDC		(0x01 << 19)
#define MCMDR_OPMOD		(0x01 << 20)
#define SWR			(0x01 << 24)

/* cam command regiser */
#define CAMCMR_AUP		0x01
#define CAMCMR_AMP		(0x01 << 1)
#define CAMCMR_ABP		(0x01 << 2)
#define CAMCMR_CCAM		(0x01 << 3)
#define CAMCMR_ECMP		(0x01 << 4)
#define CAM0EN			0x01

/* mac mii controller bit */
#define MDCCR			(0x0a << 20)
#define PHYAD			(0x01 << 8)
#define PHYWR			(0x01 << 16)
#define PHYBUSY			(0x01 << 17)
#define PHYPRESP		(0x01 << 18)
#define CAM_ENTRY_SIZE		0x08

/* rx and tx status */
#define TXDS_TXCP		(0x01 << 19)
#define RXDS_CRCE		(0x01 << 17)
#define RXDS_PTLE		(0x01 << 19)
#define RXDS_RXGD		(0x01 << 20)
#define RXDS_ALIE		(0x01 << 21)
#define RXDS_RP			(0x01 << 22)

/* mac interrupt status*/
#define MISTA_EXDEF		(0x01 << 19)
#define MISTA_TXBERR		(0x01 << 24)
#define MISTA_TDU		(0x01 << 23)
#define MISTA_RDU		(0x01 << 10)
#define MISTA_RXBERR		(0x01 << 11)

#define ENSTART			0x01
#define ENRXINTR		0x01
#define ENRXGD			(0x01 << 4)
#define ENRXBERR		(0x01 << 11)
#define ENTXINTR		(0x01 << 16)
#define ENTXCP			(0x01 << 18)
#define ENTXABT			(0x01 << 21)
#define ENTXBERR		(0x01 << 24)
#define ENMDC			(0x01 << 19)
#define PHYBUSY			(0x01 << 17)
#define MDCCR_VAL		0xa00000

/* rx and tx owner bit */
#define RX_OWEN_DMA		(0x01 << 31)
#define RX_OWEN_CPU		(~(0x03 << 30))
#define TX_OWEN_DMA		(0x01 << 31)
#define TX_OWEN_CPU		(~(0x01 << 31))

/* tx frame desc controller bit */
#define MACTXINTEN		0x04
#define CRCMODE			0x02
#define PADDINGMODE		0x01

/* fftcr controller bit */
#define TXTHD 			(0x03 << 8)
#define BLENGTH			(0x01 << 20)

/* global setting for driver */
#define RX_DESC_SIZE		50
#define TX_DESC_SIZE		10
#define MAX_RBUFF_SZ		0x600
#define MAX_TBUFF_SZ		0x600
#define TX_TIMEOUT		50
#define DELAY			1000
#define CAM0			0x0

static int w90p910_mdio_read(struct net_device *dev, int phy_id, int reg);

struct w90p910_rxbd {
	unsigned int sl;
	unsigned int buffer;
	unsigned int reserved;
	unsigned int next;
};

struct w90p910_txbd {
	unsigned int mode;
	unsigned int buffer;
	unsigned int sl;
	unsigned int next;
};

struct recv_pdesc {
	struct w90p910_rxbd desclist[RX_DESC_SIZE];
	char recv_buf[RX_DESC_SIZE][MAX_RBUFF_SZ];
};

struct tran_pdesc {
	struct w90p910_txbd desclist[TX_DESC_SIZE];
	char tran_buf[TX_DESC_SIZE][MAX_TBUFF_SZ];
};

struct  w90p910_ether {
	struct recv_pdesc *rdesc;
	struct tran_pdesc *tdesc;
	dma_addr_t rdesc_phys;
	dma_addr_t tdesc_phys;
	struct net_device_stats stats;
	struct platform_device *pdev;
	struct resource *res;
	struct sk_buff *skb;
	struct clk *clk;
	struct clk *rmiiclk;
	struct mii_if_info mii;
	struct timer_list check_timer;
	void __iomem *reg;
	int rxirq;
	int txirq;
	unsigned int cur_tx;
	unsigned int cur_rx;
	unsigned int finish_tx;
	unsigned int rx_packets;
	unsigned int rx_bytes;
	unsigned int start_tx_ptr;
	unsigned int start_rx_ptr;
	unsigned int linkflag;
};

static void update_linkspeed_register(struct net_device *dev,
				unsigned int speed, unsigned int duplex)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = __raw_readl(ether->reg + REG_MCMDR);

	if (speed == SPEED_100) {
		/* 100 full/half duplex */
		if (duplex == DUPLEX_FULL) {
			val |= (MCMDR_OPMOD | MCMDR_FDUP);
		} else {
			val |= MCMDR_OPMOD;
			val &= ~MCMDR_FDUP;
		}
	} else {
		/* 10 full/half duplex */
		if (duplex == DUPLEX_FULL) {
			val |= MCMDR_FDUP;
			val &= ~MCMDR_OPMOD;
		} else {
			val &= ~(MCMDR_FDUP | MCMDR_OPMOD);
		}
	}

	__raw_writel(val, ether->reg + REG_MCMDR);
}

static void update_linkspeed(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	struct platform_device *pdev;
	unsigned int bmsr, bmcr, lpa, speed, duplex;

	pdev = ether->pdev;

	if (!mii_link_ok(&ether->mii)) {
		ether->linkflag = 0x0;
		netif_carrier_off(dev);
		dev_warn(&pdev->dev, "%s: Link down.\n", dev->name);
		return;
	}

	if (ether->linkflag == 1)
		return;

	bmsr = w90p910_mdio_read(dev, ether->mii.phy_id, MII_BMSR);
	bmcr = w90p910_mdio_read(dev, ether->mii.phy_id, MII_BMCR);

	if (bmcr & BMCR_ANENABLE) {
		if (!(bmsr & BMSR_ANEGCOMPLETE))
			return;

		lpa = w90p910_mdio_read(dev, ether->mii.phy_id, MII_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_linkspeed_register(dev, speed, duplex);

	dev_info(&pdev->dev, "%s: Link now %i-%s\n", dev->name, speed,
			(duplex == DUPLEX_FULL) ? "FullDuplex" : "HalfDuplex");
	ether->linkflag = 0x01;

	netif_carrier_on(dev);
}

static void w90p910_check_link(unsigned long dev_id)
{
	struct net_device *dev = (struct net_device *) dev_id;
	struct w90p910_ether *ether = netdev_priv(dev);

	update_linkspeed(dev);
	mod_timer(&ether->check_timer, jiffies + msecs_to_jiffies(1000));
}

static void w90p910_write_cam(struct net_device *dev,
				unsigned int x, unsigned char *pval)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int msw, lsw;

	msw = (pval[0] << 24) | (pval[1] << 16) | (pval[2] << 8) | pval[3];

	lsw = (pval[4] << 24) | (pval[5] << 16);

	__raw_writel(lsw, ether->reg + REG_CAML_BASE + x * CAM_ENTRY_SIZE);
	__raw_writel(msw, ether->reg + REG_CAMM_BASE + x * CAM_ENTRY_SIZE);
}

static int w90p910_init_desc(struct net_device *dev)
{
	struct w90p910_ether *ether;
	struct w90p910_txbd  *tdesc;
	struct w90p910_rxbd  *rdesc;
	struct platform_device *pdev;
	unsigned int i;

	ether = netdev_priv(dev);
	pdev = ether->pdev;

	ether->tdesc = (struct tran_pdesc *)
		dma_alloc_coherent(&pdev->dev, sizeof(struct tran_pdesc),
					&ether->tdesc_phys, GFP_KERNEL);

	if (!ether->tdesc) {
		dev_err(&pdev->dev, "Failed to allocate memory for tx desc\n");
		return -ENOMEM;
	}

	ether->rdesc = (struct recv_pdesc *)
		dma_alloc_coherent(&pdev->dev, sizeof(struct recv_pdesc),
					&ether->rdesc_phys, GFP_KERNEL);

	if (!ether->rdesc) {
		dev_err(&pdev->dev, "Failed to allocate memory for rx desc\n");
		dma_free_coherent(&pdev->dev, sizeof(struct tran_pdesc),
					ether->tdesc, ether->tdesc_phys);
		return -ENOMEM;
	}

	for (i = 0; i < TX_DESC_SIZE; i++) {
		unsigned int offset;

		tdesc = &(ether->tdesc->desclist[i]);

		if (i == TX_DESC_SIZE - 1)
			offset = offsetof(struct tran_pdesc, desclist[0]);
		else
			offset = offsetof(struct tran_pdesc, desclist[i + 1]);

		tdesc->next = ether->tdesc_phys + offset;
		tdesc->buffer = ether->tdesc_phys +
			offsetof(struct tran_pdesc, tran_buf[i]);
		tdesc->sl = 0;
		tdesc->mode = 0;
	}

	ether->start_tx_ptr = ether->tdesc_phys;

	for (i = 0; i < RX_DESC_SIZE; i++) {
		unsigned int offset;

		rdesc = &(ether->rdesc->desclist[i]);

		if (i == RX_DESC_SIZE - 1)
			offset = offsetof(struct recv_pdesc, desclist[0]);
		else
			offset = offsetof(struct recv_pdesc, desclist[i + 1]);

		rdesc->next = ether->rdesc_phys + offset;
		rdesc->sl = RX_OWEN_DMA;
		rdesc->buffer = ether->rdesc_phys +
			offsetof(struct recv_pdesc, recv_buf[i]);
	  }

	ether->start_rx_ptr = ether->rdesc_phys;

	return 0;
}

static void w90p910_set_fifo_threshold(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = TXTHD | BLENGTH;
	__raw_writel(val, ether->reg + REG_FFTCR);
}

static void w90p910_return_default_idle(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = __raw_readl(ether->reg + REG_MCMDR);
	val |= SWR;
	__raw_writel(val, ether->reg + REG_MCMDR);
}

static void w90p910_trigger_rx(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);

	__raw_writel(ENSTART, ether->reg + REG_RSDR);
}

static void w90p910_trigger_tx(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);

	__raw_writel(ENSTART, ether->reg + REG_TSDR);
}

static void w90p910_enable_mac_interrupt(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = ENTXINTR | ENRXINTR | ENRXGD | ENTXCP;
	val |= ENTXBERR | ENRXBERR | ENTXABT;

	__raw_writel(val, ether->reg + REG_MIEN);
}

static void w90p910_get_and_clear_int(struct net_device *dev,
							unsigned int *val)
{
	struct w90p910_ether *ether = netdev_priv(dev);

	*val = __raw_readl(ether->reg + REG_MISTA);
	__raw_writel(*val, ether->reg + REG_MISTA);
}

static void w90p910_set_global_maccmd(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = __raw_readl(ether->reg + REG_MCMDR);
	val |= MCMDR_SPCRC | MCMDR_ENMDC | MCMDR_ACP | ENMDC;
	__raw_writel(val, ether->reg + REG_MCMDR);
}

static void w90p910_enable_cam(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	w90p910_write_cam(dev, CAM0, dev->dev_addr);

	val = __raw_readl(ether->reg + REG_CAMEN);
	val |= CAM0EN;
	__raw_writel(val, ether->reg + REG_CAMEN);
}

static void w90p910_enable_cam_command(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = CAMCMR_ECMP | CAMCMR_ABP | CAMCMR_AMP;
	__raw_writel(val, ether->reg + REG_CAMCMR);
}

static void w90p910_enable_tx(struct net_device *dev, unsigned int enable)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = __raw_readl(ether->reg + REG_MCMDR);

	if (enable)
		val |= MCMDR_TXON;
	else
		val &= ~MCMDR_TXON;

	__raw_writel(val, ether->reg + REG_MCMDR);
}

static void w90p910_enable_rx(struct net_device *dev, unsigned int enable)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	unsigned int val;

	val = __raw_readl(ether->reg + REG_MCMDR);

	if (enable)
		val |= MCMDR_RXON;
	else
		val &= ~MCMDR_RXON;

	__raw_writel(val, ether->reg + REG_MCMDR);
}

static void w90p910_set_curdest(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);

	__raw_writel(ether->start_rx_ptr, ether->reg + REG_RXDLSA);
	__raw_writel(ether->start_tx_ptr, ether->reg + REG_TXDLSA);
}

static void w90p910_reset_mac(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);

	w90p910_enable_tx(dev, 0);
	w90p910_enable_rx(dev, 0);
	w90p910_set_fifo_threshold(dev);
	w90p910_return_default_idle(dev);

	if (!netif_queue_stopped(dev))
		netif_stop_queue(dev);

	w90p910_init_desc(dev);

	dev->trans_start = jiffies; /* prevent tx timeout */
	ether->cur_tx = 0x0;
	ether->finish_tx = 0x0;
	ether->cur_rx = 0x0;

	w90p910_set_curdest(dev);
	w90p910_enable_cam(dev);
	w90p910_enable_cam_command(dev);
	w90p910_enable_mac_interrupt(dev);
	w90p910_enable_tx(dev, 1);
	w90p910_enable_rx(dev, 1);
	w90p910_trigger_tx(dev);
	w90p910_trigger_rx(dev);

	dev->trans_start = jiffies; /* prevent tx timeout */

	if (netif_queue_stopped(dev))
		netif_wake_queue(dev);
}

static void w90p910_mdio_write(struct net_device *dev,
					int phy_id, int reg, int data)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	struct platform_device *pdev;
	unsigned int val, i;

	pdev = ether->pdev;

	__raw_writel(data, ether->reg + REG_MIID);

	val = (phy_id << 0x08) | reg;
	val |= PHYBUSY | PHYWR | MDCCR_VAL;
	__raw_writel(val, ether->reg + REG_MIIDA);

	for (i = 0; i < DELAY; i++) {
		if ((__raw_readl(ether->reg + REG_MIIDA) & PHYBUSY) == 0)
			break;
	}

	if (i == DELAY)
		dev_warn(&pdev->dev, "mdio write timed out\n");
}

static int w90p910_mdio_read(struct net_device *dev, int phy_id, int reg)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	struct platform_device *pdev;
	unsigned int val, i, data;

	pdev = ether->pdev;

	val = (phy_id << 0x08) | reg;
	val |= PHYBUSY | MDCCR_VAL;
	__raw_writel(val, ether->reg + REG_MIIDA);

	for (i = 0; i < DELAY; i++) {
		if ((__raw_readl(ether->reg + REG_MIIDA) & PHYBUSY) == 0)
			break;
	}

	if (i == DELAY) {
		dev_warn(&pdev->dev, "mdio read timed out\n");
		data = 0xffff;
	} else {
		data = __raw_readl(ether->reg + REG_MIID);
	}

	return data;
}

static int w90p910_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);
	w90p910_write_cam(dev, CAM0, dev->dev_addr);

	return 0;
}

static int w90p910_ether_close(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	struct platform_device *pdev;

	pdev = ether->pdev;

	dma_free_coherent(&pdev->dev, sizeof(struct recv_pdesc),
					ether->rdesc, ether->rdesc_phys);
	dma_free_coherent(&pdev->dev, sizeof(struct tran_pdesc),
					ether->tdesc, ether->tdesc_phys);

	netif_stop_queue(dev);

	del_timer_sync(&ether->check_timer);
	clk_disable(ether->rmiiclk);
	clk_disable(ether->clk);

	free_irq(ether->txirq, dev);
	free_irq(ether->rxirq, dev);

	return 0;
}

static struct net_device_stats *w90p910_ether_stats(struct net_device *dev)
{
	struct w90p910_ether *ether;

	ether = netdev_priv(dev);

	return &ether->stats;
}

static int w90p910_send_frame(struct net_device *dev,
					unsigned char *data, int length)
{
	struct w90p910_ether *ether;
	struct w90p910_txbd *txbd;
	struct platform_device *pdev;
	unsigned char *buffer;

	ether = netdev_priv(dev);
	pdev = ether->pdev;

	txbd = &ether->tdesc->desclist[ether->cur_tx];
	buffer = ether->tdesc->tran_buf[ether->cur_tx];

	if (length > 1514) {
		dev_err(&pdev->dev, "send data %d bytes, check it\n", length);
		length = 1514;
	}

	txbd->sl = length & 0xFFFF;

	memcpy(buffer, data, length);

	txbd->mode = TX_OWEN_DMA | PADDINGMODE | CRCMODE | MACTXINTEN;

	w90p910_enable_tx(dev, 1);

	w90p910_trigger_tx(dev);

	if (++ether->cur_tx >= TX_DESC_SIZE)
		ether->cur_tx = 0;

	txbd = &ether->tdesc->desclist[ether->cur_tx];

	if (txbd->mode & TX_OWEN_DMA)
		netif_stop_queue(dev);

	return 0;
}

static int w90p910_ether_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);

	if (!(w90p910_send_frame(dev, skb->data, skb->len))) {
		ether->skb = skb;
		dev_kfree_skb_irq(skb);
		return 0;
	}
	return -EAGAIN;
}

static irqreturn_t w90p910_tx_interrupt(int irq, void *dev_id)
{
	struct w90p910_ether *ether;
	struct w90p910_txbd  *txbd;
	struct platform_device *pdev;
	struct net_device *dev;
	unsigned int cur_entry, entry, status;

	dev = dev_id;
	ether = netdev_priv(dev);
	pdev = ether->pdev;

	w90p910_get_and_clear_int(dev, &status);

	cur_entry = __raw_readl(ether->reg + REG_CTXDSA);

	entry = ether->tdesc_phys +
		offsetof(struct tran_pdesc, desclist[ether->finish_tx]);

	while (entry != cur_entry) {
		txbd = &ether->tdesc->desclist[ether->finish_tx];

		if (++ether->finish_tx >= TX_DESC_SIZE)
			ether->finish_tx = 0;

		if (txbd->sl & TXDS_TXCP) {
			ether->stats.tx_packets++;
			ether->stats.tx_bytes += txbd->sl & 0xFFFF;
		} else {
			ether->stats.tx_errors++;
		}

		txbd->sl = 0x0;
		txbd->mode = 0x0;

		if (netif_queue_stopped(dev))
			netif_wake_queue(dev);

		entry = ether->tdesc_phys +
			offsetof(struct tran_pdesc, desclist[ether->finish_tx]);
	}

	if (status & MISTA_EXDEF) {
		dev_err(&pdev->dev, "emc defer exceed interrupt\n");
	} else if (status & MISTA_TXBERR) {
		dev_err(&pdev->dev, "emc bus error interrupt\n");
		w90p910_reset_mac(dev);
	} else if (status & MISTA_TDU) {
		if (netif_queue_stopped(dev))
			netif_wake_queue(dev);
	}

	return IRQ_HANDLED;
}

static void netdev_rx(struct net_device *dev)
{
	struct w90p910_ether *ether;
	struct w90p910_rxbd *rxbd;
	struct platform_device *pdev;
	struct sk_buff *skb;
	unsigned char *data;
	unsigned int length, status, val, entry;

	ether = netdev_priv(dev);
	pdev = ether->pdev;

	rxbd = &ether->rdesc->desclist[ether->cur_rx];

	do {
		val = __raw_readl(ether->reg + REG_CRXDSA);

		entry = ether->rdesc_phys +
			offsetof(struct recv_pdesc, desclist[ether->cur_rx]);

		if (val == entry)
			break;

		status = rxbd->sl;
		length = status & 0xFFFF;

		if (status & RXDS_RXGD) {
			data = ether->rdesc->recv_buf[ether->cur_rx];
			skb = dev_alloc_skb(length+2);
			if (!skb) {
				dev_err(&pdev->dev, "get skb buffer error\n");
				ether->stats.rx_dropped++;
				return;
			}

			skb_reserve(skb, 2);
			skb_put(skb, length);
			skb_copy_to_linear_data(skb, data, length);
			skb->protocol = eth_type_trans(skb, dev);
			ether->stats.rx_packets++;
			ether->stats.rx_bytes += length;
			netif_rx(skb);
		} else {
			ether->stats.rx_errors++;

			if (status & RXDS_RP) {
				dev_err(&pdev->dev, "rx runt err\n");
				ether->stats.rx_length_errors++;
			} else if (status & RXDS_CRCE) {
				dev_err(&pdev->dev, "rx crc err\n");
				ether->stats.rx_crc_errors++;
			} else if (status & RXDS_ALIE) {
				dev_err(&pdev->dev, "rx aligment err\n");
				ether->stats.rx_frame_errors++;
			} else if (status & RXDS_PTLE) {
				dev_err(&pdev->dev, "rx longer err\n");
				ether->stats.rx_over_errors++;
			}
		}

		rxbd->sl = RX_OWEN_DMA;
		rxbd->reserved = 0x0;

		if (++ether->cur_rx >= RX_DESC_SIZE)
			ether->cur_rx = 0;

		rxbd = &ether->rdesc->desclist[ether->cur_rx];

	} while (1);
}

static irqreturn_t w90p910_rx_interrupt(int irq, void *dev_id)
{
	struct net_device *dev;
	struct w90p910_ether  *ether;
	struct platform_device *pdev;
	unsigned int status;

	dev = dev_id;
	ether = netdev_priv(dev);
	pdev = ether->pdev;

	w90p910_get_and_clear_int(dev, &status);

	if (status & MISTA_RDU) {
		netdev_rx(dev);
		w90p910_trigger_rx(dev);

		return IRQ_HANDLED;
	} else if (status & MISTA_RXBERR) {
		dev_err(&pdev->dev, "emc rx bus error\n");
		w90p910_reset_mac(dev);
	}

	netdev_rx(dev);
	return IRQ_HANDLED;
}

static int w90p910_ether_open(struct net_device *dev)
{
	struct w90p910_ether *ether;
	struct platform_device *pdev;

	ether = netdev_priv(dev);
	pdev = ether->pdev;

	w90p910_reset_mac(dev);
	w90p910_set_fifo_threshold(dev);
	w90p910_set_curdest(dev);
	w90p910_enable_cam(dev);
	w90p910_enable_cam_command(dev);
	w90p910_enable_mac_interrupt(dev);
	w90p910_set_global_maccmd(dev);
	w90p910_enable_rx(dev, 1);

	ether->rx_packets = 0x0;
	ether->rx_bytes = 0x0;

	if (request_irq(ether->txirq, w90p910_tx_interrupt,
						0x0, pdev->name, dev)) {
		dev_err(&pdev->dev, "register irq tx failed\n");
		return -EAGAIN;
	}

	if (request_irq(ether->rxirq, w90p910_rx_interrupt,
						0x0, pdev->name, dev)) {
		dev_err(&pdev->dev, "register irq rx failed\n");
		free_irq(ether->txirq, dev);
		return -EAGAIN;
	}

	mod_timer(&ether->check_timer, jiffies + msecs_to_jiffies(1000));
	netif_start_queue(dev);
	w90p910_trigger_rx(dev);

	dev_info(&pdev->dev, "%s is OPENED\n", dev->name);

	return 0;
}

static void w90p910_ether_set_multicast_list(struct net_device *dev)
{
	struct w90p910_ether *ether;
	unsigned int rx_mode;

	ether = netdev_priv(dev);

	if (dev->flags & IFF_PROMISC)
		rx_mode = CAMCMR_AUP | CAMCMR_AMP | CAMCMR_ABP | CAMCMR_ECMP;
	else if ((dev->flags & IFF_ALLMULTI) || !netdev_mc_empty(dev))
		rx_mode = CAMCMR_AMP | CAMCMR_ABP | CAMCMR_ECMP;
	else
		rx_mode = CAMCMR_ECMP | CAMCMR_ABP;
	__raw_writel(rx_mode, ether->reg + REG_CAMCMR);
}

static int w90p910_ether_ioctl(struct net_device *dev,
						struct ifreq *ifr, int cmd)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	struct mii_ioctl_data *data = if_mii(ifr);

	return generic_mii_ioctl(&ether->mii, data, cmd, NULL);
}

static void w90p910_get_drvinfo(struct net_device *dev,
					struct ethtool_drvinfo *info)
{
	strcpy(info->driver, DRV_MODULE_NAME);
	strcpy(info->version, DRV_MODULE_VERSION);
}

static int w90p910_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	return mii_ethtool_gset(&ether->mii, cmd);
}

static int w90p910_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	return mii_ethtool_sset(&ether->mii, cmd);
}

static int w90p910_nway_reset(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	return mii_nway_restart(&ether->mii);
}

static u32 w90p910_get_link(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	return mii_link_ok(&ether->mii);
}

static const struct ethtool_ops w90p910_ether_ethtool_ops = {
	.get_settings	= w90p910_get_settings,
	.set_settings	= w90p910_set_settings,
	.get_drvinfo	= w90p910_get_drvinfo,
	.nway_reset	= w90p910_nway_reset,
	.get_link	= w90p910_get_link,
};

static const struct net_device_ops w90p910_ether_netdev_ops = {
	.ndo_open		= w90p910_ether_open,
	.ndo_stop		= w90p910_ether_close,
	.ndo_start_xmit		= w90p910_ether_start_xmit,
	.ndo_get_stats		= w90p910_ether_stats,
	.ndo_set_multicast_list	= w90p910_ether_set_multicast_list,
	.ndo_set_mac_address	= w90p910_set_mac_address,
	.ndo_do_ioctl		= w90p910_ether_ioctl,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_change_mtu		= eth_change_mtu,
};

static void __init get_mac_address(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);
	struct platform_device *pdev;
	char addr[6];

	pdev = ether->pdev;

	addr[0] = 0x00;
	addr[1] = 0x02;
	addr[2] = 0xac;
	addr[3] = 0x55;
	addr[4] = 0x88;
	addr[5] = 0xa8;

	if (is_valid_ether_addr(addr))
		memcpy(dev->dev_addr, &addr, 0x06);
	else
		dev_err(&pdev->dev, "invalid mac address\n");
}

static int w90p910_ether_setup(struct net_device *dev)
{
	struct w90p910_ether *ether = netdev_priv(dev);

	ether_setup(dev);
	dev->netdev_ops = &w90p910_ether_netdev_ops;
	dev->ethtool_ops = &w90p910_ether_ethtool_ops;

	dev->tx_queue_len = 16;
	dev->dma = 0x0;
	dev->watchdog_timeo = TX_TIMEOUT;

	get_mac_address(dev);

	ether->cur_tx = 0x0;
	ether->cur_rx = 0x0;
	ether->finish_tx = 0x0;
	ether->linkflag = 0x0;
	ether->mii.phy_id = 0x01;
	ether->mii.phy_id_mask = 0x1f;
	ether->mii.reg_num_mask = 0x1f;
	ether->mii.dev = dev;
	ether->mii.mdio_read = w90p910_mdio_read;
	ether->mii.mdio_write = w90p910_mdio_write;

	setup_timer(&ether->check_timer, w90p910_check_link,
						(unsigned long)dev);

	return 0;
}

static int __devinit w90p910_ether_probe(struct platform_device *pdev)
{
	struct w90p910_ether *ether;
	struct net_device *dev;
	int error;

	dev = alloc_etherdev(sizeof(struct w90p910_ether));
	if (!dev)
		return -ENOMEM;

	ether = netdev_priv(dev);

	ether->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (ether->res == NULL) {
		dev_err(&pdev->dev, "failed to get I/O memory\n");
		error = -ENXIO;
		goto failed_free;
	}

	if (!request_mem_region(ether->res->start,
				resource_size(ether->res), pdev->name)) {
		dev_err(&pdev->dev, "failed to request I/O memory\n");
		error = -EBUSY;
		goto failed_free;
	}

	ether->reg = ioremap(ether->res->start, resource_size(ether->res));
	if (ether->reg == NULL) {
		dev_err(&pdev->dev, "failed to remap I/O memory\n");
		error = -ENXIO;
		goto failed_free_mem;
	}

	ether->txirq = platform_get_irq(pdev, 0);
	if (ether->txirq < 0) {
		dev_err(&pdev->dev, "failed to get ether tx irq\n");
		error = -ENXIO;
		goto failed_free_io;
	}

	ether->rxirq = platform_get_irq(pdev, 1);
	if (ether->rxirq < 0) {
		dev_err(&pdev->dev, "failed to get ether rx irq\n");
		error = -ENXIO;
		goto failed_free_txirq;
	}

	platform_set_drvdata(pdev, dev);

	ether->clk = clk_get(&pdev->dev, NULL);
	if (IS_ERR(ether->clk)) {
		dev_err(&pdev->dev, "failed to get ether clock\n");
		error = PTR_ERR(ether->clk);
		goto failed_free_rxirq;
	}

	ether->rmiiclk = clk_get(&pdev->dev, "RMII");
	if (IS_ERR(ether->rmiiclk)) {
		dev_err(&pdev->dev, "failed to get ether clock\n");
		error = PTR_ERR(ether->rmiiclk);
		goto failed_put_clk;
	}

	ether->pdev = pdev;

	w90p910_ether_setup(dev);

	error = register_netdev(dev);
	if (error != 0) {
		dev_err(&pdev->dev, "Regiter EMC w90p910 FAILED\n");
		error = -ENODEV;
		goto failed_put_rmiiclk;
	}

	return 0;
failed_put_rmiiclk:
	clk_put(ether->rmiiclk);
failed_put_clk:
	clk_put(ether->clk);
failed_free_rxirq:
	free_irq(ether->rxirq, pdev);
	platform_set_drvdata(pdev, NULL);
failed_free_txirq:
	free_irq(ether->txirq, pdev);
failed_free_io:
	iounmap(ether->reg);
failed_free_mem:
	release_mem_region(ether->res->start, resource_size(ether->res));
failed_free:
	free_netdev(dev);
	return error;
}

static int __devexit w90p910_ether_remove(struct platform_device *pdev)
{
	struct net_device *dev = platform_get_drvdata(pdev);
	struct w90p910_ether *ether = netdev_priv(dev);

	unregister_netdev(dev);

	clk_put(ether->rmiiclk);
	clk_put(ether->clk);

	iounmap(ether->reg);
	release_mem_region(ether->res->start, resource_size(ether->res));

	free_irq(ether->txirq, dev);
	free_irq(ether->rxirq, dev);

	del_timer_sync(&ether->check_timer);
	platform_set_drvdata(pdev, NULL);

	free_netdev(dev);
	return 0;
}

static struct platform_driver w90p910_ether_driver = {
	.probe		= w90p910_ether_probe,
	.remove		= __devexit_p(w90p910_ether_remove),
	.driver		= {
		.name	= "nuc900-emc",
		.owner	= THIS_MODULE,
	},
};

static int __init w90p910_ether_init(void)
{
	return platform_driver_register(&w90p910_ether_driver);
}

static void __exit w90p910_ether_exit(void)
{
	platform_driver_unregister(&w90p910_ether_driver);
}

module_init(w90p910_ether_init);
module_exit(w90p910_ether_exit);

MODULE_AUTHOR("Wan ZongShun <mcuos.com@gmail.com>");
MODULE_DESCRIPTION("w90p910 MAC driver!");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:nuc900-emc");