summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/rdc/r6040.c
blob: a8f282c43a78908dc5ec0bade1b141ff3aec3f4f (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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * RDC R6040 Fast Ethernet MAC support
 *
 * Copyright (C) 2004 Sten Wang <sten.wang@rdc.com.tw>
 * Copyright (C) 2007
 *	Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
 * Copyright (C) 2007-2012 Florian Fainelli <f.fainelli@gmail.com>
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/crc32.h>
#include <linux/spinlock.h>
#include <linux/bitops.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/uaccess.h>
#include <linux/phy.h>

#include <asm/processor.h>

#define DRV_NAME	"r6040"
#define DRV_VERSION	"0.29"
#define DRV_RELDATE	"04Jul2016"

/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT	(6000 * HZ / 1000)

/* RDC MAC I/O Size */
#define R6040_IO_SIZE	256

/* MAX RDC MAC */
#define MAX_MAC		2

/* MAC registers */
#define MCR0		0x00	/* Control register 0 */
#define  MCR0_RCVEN	0x0002	/* Receive enable */
#define  MCR0_PROMISC	0x0020	/* Promiscuous mode */
#define  MCR0_HASH_EN	0x0100	/* Enable multicast hash table function */
#define  MCR0_XMTEN	0x1000	/* Transmission enable */
#define  MCR0_FD	0x8000	/* Full/Half duplex */
#define MCR1		0x04	/* Control register 1 */
#define  MAC_RST	0x0001	/* Reset the MAC */
#define MBCR		0x08	/* Bus control */
#define MT_ICR		0x0C	/* TX interrupt control */
#define MR_ICR		0x10	/* RX interrupt control */
#define MTPR		0x14	/* TX poll command register */
#define  TM2TX		0x0001	/* Trigger MAC to transmit */
#define MR_BSR		0x18	/* RX buffer size */
#define MR_DCR		0x1A	/* RX descriptor control */
#define MLSR		0x1C	/* Last status */
#define  TX_FIFO_UNDR	0x0200	/* TX FIFO under-run */
#define	 TX_EXCEEDC	0x2000	/* Transmit exceed collision */
#define  TX_LATEC	0x4000	/* Transmit late collision */
#define MMDIO		0x20	/* MDIO control register */
#define  MDIO_WRITE	0x4000	/* MDIO write */
#define  MDIO_READ	0x2000	/* MDIO read */
#define MMRD		0x24	/* MDIO read data register */
#define MMWD		0x28	/* MDIO write data register */
#define MTD_SA0		0x2C	/* TX descriptor start address 0 */
#define MTD_SA1		0x30	/* TX descriptor start address 1 */
#define MRD_SA0		0x34	/* RX descriptor start address 0 */
#define MRD_SA1		0x38	/* RX descriptor start address 1 */
#define MISR		0x3C	/* Status register */
#define MIER		0x40	/* INT enable register */
#define  MSK_INT	0x0000	/* Mask off interrupts */
#define  RX_FINISH	0x0001  /* RX finished */
#define  RX_NO_DESC	0x0002  /* No RX descriptor available */
#define  RX_FIFO_FULL	0x0004  /* RX FIFO full */
#define  RX_EARLY	0x0008  /* RX early */
#define  TX_FINISH	0x0010  /* TX finished */
#define  TX_EARLY	0x0080  /* TX early */
#define  EVENT_OVRFL	0x0100  /* Event counter overflow */
#define  LINK_CHANGED	0x0200  /* PHY link changed */
#define ME_CISR		0x44	/* Event counter INT status */
#define ME_CIER		0x48	/* Event counter INT enable  */
#define MR_CNT		0x50	/* Successfully received packet counter */
#define ME_CNT0		0x52	/* Event counter 0 */
#define ME_CNT1		0x54	/* Event counter 1 */
#define ME_CNT2		0x56	/* Event counter 2 */
#define ME_CNT3		0x58	/* Event counter 3 */
#define MT_CNT		0x5A	/* Successfully transmit packet counter */
#define ME_CNT4		0x5C	/* Event counter 4 */
#define MP_CNT		0x5E	/* Pause frame counter register */
#define MAR0		0x60	/* Hash table 0 */
#define MAR1		0x62	/* Hash table 1 */
#define MAR2		0x64	/* Hash table 2 */
#define MAR3		0x66	/* Hash table 3 */
#define MID_0L		0x68	/* Multicast address MID0 Low */
#define MID_0M		0x6A	/* Multicast address MID0 Medium */
#define MID_0H		0x6C	/* Multicast address MID0 High */
#define MID_1L		0x70	/* MID1 Low */
#define MID_1M		0x72	/* MID1 Medium */
#define MID_1H		0x74	/* MID1 High */
#define MID_2L		0x78	/* MID2 Low */
#define MID_2M		0x7A	/* MID2 Medium */
#define MID_2H		0x7C	/* MID2 High */
#define MID_3L		0x80	/* MID3 Low */
#define MID_3M		0x82	/* MID3 Medium */
#define MID_3H		0x84	/* MID3 High */
#define PHY_CC		0x88	/* PHY status change configuration register */
#define  SCEN		0x8000	/* PHY status change enable */
#define  PHYAD_SHIFT	8	/* PHY address shift */
#define  TMRDIV_SHIFT	0	/* Timer divider shift */
#define PHY_ST		0x8A	/* PHY status register */
#define MAC_SM		0xAC	/* MAC status machine */
#define  MAC_SM_RST	0x0002	/* MAC status machine reset */
#define MD_CSC		0xb6	/* MDC speed control register */
#define  MD_CSC_DEFAULT	0x0030
#define MAC_ID		0xBE	/* Identifier register */

#define TX_DCNT		0x80	/* TX descriptor count */
#define RX_DCNT		0x80	/* RX descriptor count */
#define MAX_BUF_SIZE	0x600
#define RX_DESC_SIZE	(RX_DCNT * sizeof(struct r6040_descriptor))
#define TX_DESC_SIZE	(TX_DCNT * sizeof(struct r6040_descriptor))
#define MBCR_DEFAULT	0x012A	/* MAC Bus Control Register */
#define MCAST_MAX	3	/* Max number multicast addresses to filter */

#define MAC_DEF_TIMEOUT	2048	/* Default MAC read/write operation timeout */

/* Descriptor status */
#define DSC_OWNER_MAC	0x8000	/* MAC is the owner of this descriptor */
#define DSC_RX_OK	0x4000	/* RX was successful */
#define DSC_RX_ERR	0x0800	/* RX PHY error */
#define DSC_RX_ERR_DRI	0x0400	/* RX dribble packet */
#define DSC_RX_ERR_BUF	0x0200	/* RX length exceeds buffer size */
#define DSC_RX_ERR_LONG	0x0100	/* RX length > maximum packet length */
#define DSC_RX_ERR_RUNT	0x0080	/* RX packet length < 64 byte */
#define DSC_RX_ERR_CRC	0x0040	/* RX CRC error */
#define DSC_RX_BCAST	0x0020	/* RX broadcast (no error) */
#define DSC_RX_MCAST	0x0010	/* RX multicast (no error) */
#define DSC_RX_MCH_HIT	0x0008	/* RX multicast hit in hash table (no error) */
#define DSC_RX_MIDH_HIT	0x0004	/* RX MID table hit (no error) */
#define DSC_RX_IDX_MID_MASK 3	/* RX mask for the index of matched MIDx */

MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>,"
	"Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,"
	"Florian Fainelli <f.fainelli@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver");
MODULE_VERSION(DRV_VERSION " " DRV_RELDATE);

/* RX and TX interrupts that we handle */
#define RX_INTS			(RX_FIFO_FULL | RX_NO_DESC | RX_FINISH)
#define TX_INTS			(TX_FINISH)
#define INT_MASK		(RX_INTS | TX_INTS)

struct r6040_descriptor {
	u16	status, len;		/* 0-3 */
	__le32	buf;			/* 4-7 */
	__le32	ndesc;			/* 8-B */
	u32	rev1;			/* C-F */
	char	*vbufp;			/* 10-13 */
	struct r6040_descriptor *vndescp;	/* 14-17 */
	struct sk_buff *skb_ptr;	/* 18-1B */
	u32	rev2;			/* 1C-1F */
} __aligned(32);

struct r6040_private {
	spinlock_t lock;		/* driver lock */
	struct pci_dev *pdev;
	struct r6040_descriptor *rx_insert_ptr;
	struct r6040_descriptor *rx_remove_ptr;
	struct r6040_descriptor *tx_insert_ptr;
	struct r6040_descriptor *tx_remove_ptr;
	struct r6040_descriptor *rx_ring;
	struct r6040_descriptor *tx_ring;
	dma_addr_t rx_ring_dma;
	dma_addr_t tx_ring_dma;
	u16	tx_free_desc;
	u16	mcr0;
	struct net_device *dev;
	struct mii_bus *mii_bus;
	struct napi_struct napi;
	void __iomem *base;
	int old_link;
	int old_duplex;
};

static char version[] = DRV_NAME
	": RDC R6040 NAPI net driver,"
	"version "DRV_VERSION " (" DRV_RELDATE ")";

/* Read a word data from PHY Chip */
static int r6040_phy_read(void __iomem *ioaddr, int phy_addr, int reg)
{
	int limit = MAC_DEF_TIMEOUT;
	u16 cmd;

	iowrite16(MDIO_READ | reg | (phy_addr << 8), ioaddr + MMDIO);
	/* Wait for the read bit to be cleared */
	while (limit--) {
		cmd = ioread16(ioaddr + MMDIO);
		if (!(cmd & MDIO_READ))
			break;
		udelay(1);
	}

	if (limit < 0)
		return -ETIMEDOUT;

	return ioread16(ioaddr + MMRD);
}

/* Write a word data from PHY Chip */
static int r6040_phy_write(void __iomem *ioaddr,
					int phy_addr, int reg, u16 val)
{
	int limit = MAC_DEF_TIMEOUT;
	u16 cmd;

	iowrite16(val, ioaddr + MMWD);
	/* Write the command to the MDIO bus */
	iowrite16(MDIO_WRITE | reg | (phy_addr << 8), ioaddr + MMDIO);
	/* Wait for the write bit to be cleared */
	while (limit--) {
		cmd = ioread16(ioaddr + MMDIO);
		if (!(cmd & MDIO_WRITE))
			break;
		udelay(1);
	}

	return (limit < 0) ? -ETIMEDOUT : 0;
}

static int r6040_mdiobus_read(struct mii_bus *bus, int phy_addr, int reg)
{
	struct net_device *dev = bus->priv;
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;

	return r6040_phy_read(ioaddr, phy_addr, reg);
}

static int r6040_mdiobus_write(struct mii_bus *bus, int phy_addr,
						int reg, u16 value)
{
	struct net_device *dev = bus->priv;
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;

	return r6040_phy_write(ioaddr, phy_addr, reg, value);
}

static void r6040_free_txbufs(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	int i;

	for (i = 0; i < TX_DCNT; i++) {
		if (lp->tx_insert_ptr->skb_ptr) {
			dma_unmap_single(&lp->pdev->dev,
					 le32_to_cpu(lp->tx_insert_ptr->buf),
					 MAX_BUF_SIZE, DMA_TO_DEVICE);
			dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
			lp->tx_insert_ptr->skb_ptr = NULL;
		}
		lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
	}
}

static void r6040_free_rxbufs(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	int i;

	for (i = 0; i < RX_DCNT; i++) {
		if (lp->rx_insert_ptr->skb_ptr) {
			dma_unmap_single(&lp->pdev->dev,
					 le32_to_cpu(lp->rx_insert_ptr->buf),
					 MAX_BUF_SIZE, DMA_FROM_DEVICE);
			dev_kfree_skb(lp->rx_insert_ptr->skb_ptr);
			lp->rx_insert_ptr->skb_ptr = NULL;
		}
		lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp;
	}
}

static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring,
				 dma_addr_t desc_dma, int size)
{
	struct r6040_descriptor *desc = desc_ring;
	dma_addr_t mapping = desc_dma;

	while (size-- > 0) {
		mapping += sizeof(*desc);
		desc->ndesc = cpu_to_le32(mapping);
		desc->vndescp = desc + 1;
		desc++;
	}
	desc--;
	desc->ndesc = cpu_to_le32(desc_dma);
	desc->vndescp = desc_ring;
}

static void r6040_init_txbufs(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);

	lp->tx_free_desc = TX_DCNT;

	lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring;
	r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT);
}

static int r6040_alloc_rxbufs(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	struct r6040_descriptor *desc;
	struct sk_buff *skb;
	int rc;

	lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring;
	r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT);

	/* Allocate skbs for the rx descriptors */
	desc = lp->rx_ring;
	do {
		skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
		if (!skb) {
			rc = -ENOMEM;
			goto err_exit;
		}
		desc->skb_ptr = skb;
		desc->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev,
						       desc->skb_ptr->data,
						       MAX_BUF_SIZE,
						       DMA_FROM_DEVICE));
		desc->status = DSC_OWNER_MAC;
		desc = desc->vndescp;
	} while (desc != lp->rx_ring);

	return 0;

err_exit:
	/* Deallocate all previously allocated skbs */
	r6040_free_rxbufs(dev);
	return rc;
}

static void r6040_reset_mac(struct r6040_private *lp)
{
	void __iomem *ioaddr = lp->base;
	int limit = MAC_DEF_TIMEOUT;
	u16 cmd, md_csc;

	md_csc = ioread16(ioaddr + MD_CSC);
	iowrite16(MAC_RST, ioaddr + MCR1);
	while (limit--) {
		cmd = ioread16(ioaddr + MCR1);
		if (cmd & MAC_RST)
			break;
	}

	/* Reset internal state machine */
	iowrite16(MAC_SM_RST, ioaddr + MAC_SM);
	iowrite16(0, ioaddr + MAC_SM);
	mdelay(5);

	/* Restore MDIO clock frequency */
	if (md_csc != MD_CSC_DEFAULT)
		iowrite16(md_csc, ioaddr + MD_CSC);
}

static void r6040_init_mac_regs(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;

	/* Mask Off Interrupt */
	iowrite16(MSK_INT, ioaddr + MIER);

	/* Reset RDC MAC */
	r6040_reset_mac(lp);

	/* MAC Bus Control Register */
	iowrite16(MBCR_DEFAULT, ioaddr + MBCR);

	/* Buffer Size Register */
	iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR);

	/* Write TX ring start address */
	iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0);
	iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1);

	/* Write RX ring start address */
	iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0);
	iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1);

	/* Set interrupt waiting time and packet numbers */
	iowrite16(0, ioaddr + MT_ICR);
	iowrite16(0, ioaddr + MR_ICR);

	/* Enable interrupts */
	iowrite16(INT_MASK, ioaddr + MIER);

	/* Enable TX and RX */
	iowrite16(lp->mcr0 | MCR0_RCVEN, ioaddr);

	/* Let TX poll the descriptors
	 * we may got called by r6040_tx_timeout which has left
	 * some unsent tx buffers */
	iowrite16(TM2TX, ioaddr + MTPR);
}

static void r6040_tx_timeout(struct net_device *dev, unsigned int txqueue)
{
	struct r6040_private *priv = netdev_priv(dev);
	void __iomem *ioaddr = priv->base;

	netdev_warn(dev, "transmit timed out, int enable %4.4x "
		"status %4.4x\n",
		ioread16(ioaddr + MIER),
		ioread16(ioaddr + MISR));

	dev->stats.tx_errors++;

	/* Reset MAC and re-init all registers */
	r6040_init_mac_regs(dev);
}

static struct net_device_stats *r6040_get_stats(struct net_device *dev)
{
	struct r6040_private *priv = netdev_priv(dev);
	void __iomem *ioaddr = priv->base;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);
	dev->stats.rx_crc_errors += ioread8(ioaddr + ME_CNT1);
	dev->stats.multicast += ioread8(ioaddr + ME_CNT0);
	spin_unlock_irqrestore(&priv->lock, flags);

	return &dev->stats;
}

/* Stop RDC MAC and Free the allocated resource */
static void r6040_down(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;
	const u16 *adrp;

	/* Stop MAC */
	iowrite16(MSK_INT, ioaddr + MIER);	/* Mask Off Interrupt */

	/* Reset RDC MAC */
	r6040_reset_mac(lp);

	/* Restore MAC Address to MIDx */
	adrp = (const u16 *) dev->dev_addr;
	iowrite16(adrp[0], ioaddr + MID_0L);
	iowrite16(adrp[1], ioaddr + MID_0M);
	iowrite16(adrp[2], ioaddr + MID_0H);
}

static int r6040_close(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	struct pci_dev *pdev = lp->pdev;

	phy_stop(dev->phydev);
	napi_disable(&lp->napi);
	netif_stop_queue(dev);

	spin_lock_irq(&lp->lock);
	r6040_down(dev);

	/* Free RX buffer */
	r6040_free_rxbufs(dev);

	/* Free TX buffer */
	r6040_free_txbufs(dev);

	spin_unlock_irq(&lp->lock);

	free_irq(dev->irq, dev);

	/* Free Descriptor memory */
	if (lp->rx_ring) {
		dma_free_coherent(&pdev->dev, RX_DESC_SIZE, lp->rx_ring,
				  lp->rx_ring_dma);
		lp->rx_ring = NULL;
	}

	if (lp->tx_ring) {
		dma_free_coherent(&pdev->dev, TX_DESC_SIZE, lp->tx_ring,
				  lp->tx_ring_dma);
		lp->tx_ring = NULL;
	}

	return 0;
}

static int r6040_rx(struct net_device *dev, int limit)
{
	struct r6040_private *priv = netdev_priv(dev);
	struct r6040_descriptor *descptr = priv->rx_remove_ptr;
	struct sk_buff *skb_ptr, *new_skb;
	int count = 0;
	u16 err;

	/* Limit not reached and the descriptor belongs to the CPU */
	while (count < limit && !(descptr->status & DSC_OWNER_MAC)) {
		/* Read the descriptor status */
		err = descptr->status;
		/* Global error status set */
		if (err & DSC_RX_ERR) {
			/* RX dribble */
			if (err & DSC_RX_ERR_DRI)
				dev->stats.rx_frame_errors++;
			/* Buffer length exceeded */
			if (err & DSC_RX_ERR_BUF)
				dev->stats.rx_length_errors++;
			/* Packet too long */
			if (err & DSC_RX_ERR_LONG)
				dev->stats.rx_length_errors++;
			/* Packet < 64 bytes */
			if (err & DSC_RX_ERR_RUNT)
				dev->stats.rx_length_errors++;
			/* CRC error */
			if (err & DSC_RX_ERR_CRC) {
				spin_lock(&priv->lock);
				dev->stats.rx_crc_errors++;
				spin_unlock(&priv->lock);
			}
			goto next_descr;
		}

		/* Packet successfully received */
		new_skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
		if (!new_skb) {
			dev->stats.rx_dropped++;
			goto next_descr;
		}
		skb_ptr = descptr->skb_ptr;
		skb_ptr->dev = priv->dev;

		/* Do not count the CRC */
		skb_put(skb_ptr, descptr->len - ETH_FCS_LEN);
		dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf),
				 MAX_BUF_SIZE, DMA_FROM_DEVICE);
		skb_ptr->protocol = eth_type_trans(skb_ptr, priv->dev);

		/* Send to upper layer */
		netif_receive_skb(skb_ptr);
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += descptr->len - ETH_FCS_LEN;

		/* put new skb into descriptor */
		descptr->skb_ptr = new_skb;
		descptr->buf = cpu_to_le32(dma_map_single(&priv->pdev->dev,
							  descptr->skb_ptr->data,
							  MAX_BUF_SIZE,
							  DMA_FROM_DEVICE));

next_descr:
		/* put the descriptor back to the MAC */
		descptr->status = DSC_OWNER_MAC;
		descptr = descptr->vndescp;
		count++;
	}
	priv->rx_remove_ptr = descptr;

	return count;
}

static void r6040_tx(struct net_device *dev)
{
	struct r6040_private *priv = netdev_priv(dev);
	struct r6040_descriptor *descptr;
	void __iomem *ioaddr = priv->base;
	struct sk_buff *skb_ptr;
	u16 err;

	spin_lock(&priv->lock);
	descptr = priv->tx_remove_ptr;
	while (priv->tx_free_desc < TX_DCNT) {
		/* Check for errors */
		err = ioread16(ioaddr + MLSR);

		if (err & TX_FIFO_UNDR)
			dev->stats.tx_fifo_errors++;
		if (err & (TX_EXCEEDC | TX_LATEC))
			dev->stats.tx_carrier_errors++;

		if (descptr->status & DSC_OWNER_MAC)
			break; /* Not complete */
		skb_ptr = descptr->skb_ptr;

		/* Statistic Counter */
		dev->stats.tx_packets++;
		dev->stats.tx_bytes += skb_ptr->len;

		dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf),
				 skb_ptr->len, DMA_TO_DEVICE);
		/* Free buffer */
		dev_kfree_skb(skb_ptr);
		descptr->skb_ptr = NULL;
		/* To next descriptor */
		descptr = descptr->vndescp;
		priv->tx_free_desc++;
	}
	priv->tx_remove_ptr = descptr;

	if (priv->tx_free_desc)
		netif_wake_queue(dev);
	spin_unlock(&priv->lock);
}

static int r6040_poll(struct napi_struct *napi, int budget)
{
	struct r6040_private *priv =
		container_of(napi, struct r6040_private, napi);
	struct net_device *dev = priv->dev;
	void __iomem *ioaddr = priv->base;
	int work_done;

	r6040_tx(dev);

	work_done = r6040_rx(dev, budget);

	if (work_done < budget) {
		napi_complete_done(napi, work_done);
		/* Enable RX/TX interrupt */
		iowrite16(ioread16(ioaddr + MIER) | RX_INTS | TX_INTS,
			  ioaddr + MIER);
	}
	return work_done;
}

/* The RDC interrupt handler. */
static irqreturn_t r6040_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;
	u16 misr, status;

	/* Save MIER */
	misr = ioread16(ioaddr + MIER);
	/* Mask off RDC MAC interrupt */
	iowrite16(MSK_INT, ioaddr + MIER);
	/* Read MISR status and clear */
	status = ioread16(ioaddr + MISR);

	if (status == 0x0000 || status == 0xffff) {
		/* Restore RDC MAC interrupt */
		iowrite16(misr, ioaddr + MIER);
		return IRQ_NONE;
	}

	/* RX interrupt request */
	if (status & (RX_INTS | TX_INTS)) {
		if (status & RX_NO_DESC) {
			/* RX descriptor unavailable */
			dev->stats.rx_dropped++;
			dev->stats.rx_missed_errors++;
		}
		if (status & RX_FIFO_FULL)
			dev->stats.rx_fifo_errors++;

		if (likely(napi_schedule_prep(&lp->napi))) {
			/* Mask off RX interrupt */
			misr &= ~(RX_INTS | TX_INTS);
			__napi_schedule_irqoff(&lp->napi);
		}
	}

	/* Restore RDC MAC interrupt */
	iowrite16(misr, ioaddr + MIER);

	return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void r6040_poll_controller(struct net_device *dev)
{
	disable_irq(dev->irq);
	r6040_interrupt(dev->irq, dev);
	enable_irq(dev->irq);
}
#endif

/* Init RDC MAC */
static int r6040_up(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;
	int ret;

	/* Initialise and alloc RX/TX buffers */
	r6040_init_txbufs(dev);
	ret = r6040_alloc_rxbufs(dev);
	if (ret)
		return ret;

	/* improve performance (by RDC guys) */
	r6040_phy_write(ioaddr, 30, 17,
			(r6040_phy_read(ioaddr, 30, 17) | 0x4000));
	r6040_phy_write(ioaddr, 30, 17,
			~((~r6040_phy_read(ioaddr, 30, 17)) | 0x2000));
	r6040_phy_write(ioaddr, 0, 19, 0x0000);
	r6040_phy_write(ioaddr, 0, 30, 0x01F0);

	/* Initialize all MAC registers */
	r6040_init_mac_regs(dev);

	phy_start(dev->phydev);

	return 0;
}


/* Read/set MAC address routines */
static void r6040_mac_address(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;
	const u16 *adrp;

	/* Reset MAC */
	r6040_reset_mac(lp);

	/* Restore MAC Address */
	adrp = (const u16 *) dev->dev_addr;
	iowrite16(adrp[0], ioaddr + MID_0L);
	iowrite16(adrp[1], ioaddr + MID_0M);
	iowrite16(adrp[2], ioaddr + MID_0H);
}

static int r6040_open(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	int ret;

	/* Request IRQ and Register interrupt handler */
	ret = request_irq(dev->irq, r6040_interrupt,
		IRQF_SHARED, dev->name, dev);
	if (ret)
		goto out;

	/* Set MAC address */
	r6040_mac_address(dev);

	/* Allocate Descriptor memory */
	lp->rx_ring =
		dma_alloc_coherent(&lp->pdev->dev, RX_DESC_SIZE,
				   &lp->rx_ring_dma, GFP_KERNEL);
	if (!lp->rx_ring) {
		ret = -ENOMEM;
		goto err_free_irq;
	}

	lp->tx_ring =
		dma_alloc_coherent(&lp->pdev->dev, TX_DESC_SIZE,
				   &lp->tx_ring_dma, GFP_KERNEL);
	if (!lp->tx_ring) {
		ret = -ENOMEM;
		goto err_free_rx_ring;
	}

	ret = r6040_up(dev);
	if (ret)
		goto err_free_tx_ring;

	napi_enable(&lp->napi);
	netif_start_queue(dev);

	return 0;

err_free_tx_ring:
	dma_free_coherent(&lp->pdev->dev, TX_DESC_SIZE, lp->tx_ring,
			  lp->tx_ring_dma);
err_free_rx_ring:
	dma_free_coherent(&lp->pdev->dev, RX_DESC_SIZE, lp->rx_ring,
			  lp->rx_ring_dma);
err_free_irq:
	free_irq(dev->irq, dev);
out:
	return ret;
}

static netdev_tx_t r6040_start_xmit(struct sk_buff *skb,
				    struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	struct r6040_descriptor *descptr;
	void __iomem *ioaddr = lp->base;
	unsigned long flags;

	if (skb_put_padto(skb, ETH_ZLEN) < 0)
		return NETDEV_TX_OK;

	/* Critical Section */
	spin_lock_irqsave(&lp->lock, flags);

	/* TX resource check */
	if (!lp->tx_free_desc) {
		spin_unlock_irqrestore(&lp->lock, flags);
		netif_stop_queue(dev);
		netdev_err(dev, ": no tx descriptor\n");
		return NETDEV_TX_BUSY;
	}

	/* Set TX descriptor & Transmit it */
	lp->tx_free_desc--;
	descptr = lp->tx_insert_ptr;
	descptr->len = skb->len;
	descptr->skb_ptr = skb;
	descptr->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev, skb->data,
						  skb->len, DMA_TO_DEVICE));
	descptr->status = DSC_OWNER_MAC;

	skb_tx_timestamp(skb);

	/* Trigger the MAC to check the TX descriptor */
	if (!netdev_xmit_more() || netif_queue_stopped(dev))
		iowrite16(TM2TX, ioaddr + MTPR);
	lp->tx_insert_ptr = descptr->vndescp;

	/* If no tx resource, stop */
	if (!lp->tx_free_desc)
		netif_stop_queue(dev);

	spin_unlock_irqrestore(&lp->lock, flags);

	return NETDEV_TX_OK;
}

static void r6040_multicast_list(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	void __iomem *ioaddr = lp->base;
	unsigned long flags;
	struct netdev_hw_addr *ha;
	int i;
	const u16 *adrp;
	u16 hash_table[4] = { 0 };

	spin_lock_irqsave(&lp->lock, flags);

	/* Keep our MAC Address */
	adrp = (const u16 *)dev->dev_addr;
	iowrite16(adrp[0], ioaddr + MID_0L);
	iowrite16(adrp[1], ioaddr + MID_0M);
	iowrite16(adrp[2], ioaddr + MID_0H);

	/* Clear AMCP & PROM bits */
	lp->mcr0 = ioread16(ioaddr + MCR0) & ~(MCR0_PROMISC | MCR0_HASH_EN);

	/* Promiscuous mode */
	if (dev->flags & IFF_PROMISC)
		lp->mcr0 |= MCR0_PROMISC;

	/* Enable multicast hash table function to
	 * receive all multicast packets. */
	else if (dev->flags & IFF_ALLMULTI) {
		lp->mcr0 |= MCR0_HASH_EN;

		for (i = 0; i < MCAST_MAX ; i++) {
			iowrite16(0, ioaddr + MID_1L + 8 * i);
			iowrite16(0, ioaddr + MID_1M + 8 * i);
			iowrite16(0, ioaddr + MID_1H + 8 * i);
		}

		for (i = 0; i < 4; i++)
			hash_table[i] = 0xffff;
	}
	/* Use internal multicast address registers if the number of
	 * multicast addresses is not greater than MCAST_MAX. */
	else if (netdev_mc_count(dev) <= MCAST_MAX) {
		i = 0;
		netdev_for_each_mc_addr(ha, dev) {
			u16 *adrp = (u16 *) ha->addr;
			iowrite16(adrp[0], ioaddr + MID_1L + 8 * i);
			iowrite16(adrp[1], ioaddr + MID_1M + 8 * i);
			iowrite16(adrp[2], ioaddr + MID_1H + 8 * i);
			i++;
		}
		while (i < MCAST_MAX) {
			iowrite16(0, ioaddr + MID_1L + 8 * i);
			iowrite16(0, ioaddr + MID_1M + 8 * i);
			iowrite16(0, ioaddr + MID_1H + 8 * i);
			i++;
		}
	}
	/* Otherwise, Enable multicast hash table function. */
	else {
		u32 crc;

		lp->mcr0 |= MCR0_HASH_EN;

		for (i = 0; i < MCAST_MAX ; i++) {
			iowrite16(0, ioaddr + MID_1L + 8 * i);
			iowrite16(0, ioaddr + MID_1M + 8 * i);
			iowrite16(0, ioaddr + MID_1H + 8 * i);
		}

		/* Build multicast hash table */
		netdev_for_each_mc_addr(ha, dev) {
			u8 *addrs = ha->addr;

			crc = ether_crc(ETH_ALEN, addrs);
			crc >>= 26;
			hash_table[crc >> 4] |= 1 << (crc & 0xf);
		}
	}

	iowrite16(lp->mcr0, ioaddr + MCR0);

	/* Fill the MAC hash tables with their values */
	if (lp->mcr0 & MCR0_HASH_EN) {
		iowrite16(hash_table[0], ioaddr + MAR0);
		iowrite16(hash_table[1], ioaddr + MAR1);
		iowrite16(hash_table[2], ioaddr + MAR2);
		iowrite16(hash_table[3], ioaddr + MAR3);
	}

	spin_unlock_irqrestore(&lp->lock, flags);
}

static void netdev_get_drvinfo(struct net_device *dev,
			struct ethtool_drvinfo *info)
{
	struct r6040_private *rp = netdev_priv(dev);

	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
	strlcpy(info->bus_info, pci_name(rp->pdev), sizeof(info->bus_info));
}

static const struct ethtool_ops netdev_ethtool_ops = {
	.get_drvinfo		= netdev_get_drvinfo,
	.get_link		= ethtool_op_get_link,
	.get_ts_info		= ethtool_op_get_ts_info,
	.get_link_ksettings     = phy_ethtool_get_link_ksettings,
	.set_link_ksettings     = phy_ethtool_set_link_ksettings,
	.nway_reset		= phy_ethtool_nway_reset,
};

static const struct net_device_ops r6040_netdev_ops = {
	.ndo_open		= r6040_open,
	.ndo_stop		= r6040_close,
	.ndo_start_xmit		= r6040_start_xmit,
	.ndo_get_stats		= r6040_get_stats,
	.ndo_set_rx_mode	= r6040_multicast_list,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_set_mac_address	= eth_mac_addr,
	.ndo_eth_ioctl		= phy_do_ioctl,
	.ndo_tx_timeout		= r6040_tx_timeout,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller	= r6040_poll_controller,
#endif
};

static void r6040_adjust_link(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	struct phy_device *phydev = dev->phydev;
	int status_changed = 0;
	void __iomem *ioaddr = lp->base;

	BUG_ON(!phydev);

	if (lp->old_link != phydev->link) {
		status_changed = 1;
		lp->old_link = phydev->link;
	}

	/* reflect duplex change */
	if (phydev->link && (lp->old_duplex != phydev->duplex)) {
		lp->mcr0 |= (phydev->duplex == DUPLEX_FULL ? MCR0_FD : 0);
		iowrite16(lp->mcr0, ioaddr);

		status_changed = 1;
		lp->old_duplex = phydev->duplex;
	}

	if (status_changed)
		phy_print_status(phydev);
}

static int r6040_mii_probe(struct net_device *dev)
{
	struct r6040_private *lp = netdev_priv(dev);
	struct phy_device *phydev = NULL;

	phydev = phy_find_first(lp->mii_bus);
	if (!phydev) {
		dev_err(&lp->pdev->dev, "no PHY found\n");
		return -ENODEV;
	}

	phydev = phy_connect(dev, phydev_name(phydev), &r6040_adjust_link,
			     PHY_INTERFACE_MODE_MII);

	if (IS_ERR(phydev)) {
		dev_err(&lp->pdev->dev, "could not attach to PHY\n");
		return PTR_ERR(phydev);
	}

	phy_set_max_speed(phydev, SPEED_100);

	lp->old_link = 0;
	lp->old_duplex = -1;

	phy_attached_info(phydev);

	return 0;
}

static int r6040_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	struct net_device *dev;
	struct r6040_private *lp;
	void __iomem *ioaddr;
	int err, io_size = R6040_IO_SIZE;
	static int card_idx = -1;
	int bar = 0;
	u16 *adrp;

	pr_info("%s\n", version);

	err = pci_enable_device(pdev);
	if (err)
		goto err_out;

	/* this should always be supported */
	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (err) {
		dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n");
		goto err_out_disable_dev;
	}
	err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
	if (err) {
		dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n");
		goto err_out_disable_dev;
	}

	/* IO Size check */
	if (pci_resource_len(pdev, bar) < io_size) {
		dev_err(&pdev->dev, "Insufficient PCI resources, aborting\n");
		err = -EIO;
		goto err_out_disable_dev;
	}

	pci_set_master(pdev);

	dev = alloc_etherdev(sizeof(struct r6040_private));
	if (!dev) {
		err = -ENOMEM;
		goto err_out_disable_dev;
	}
	SET_NETDEV_DEV(dev, &pdev->dev);
	lp = netdev_priv(dev);

	err = pci_request_regions(pdev, DRV_NAME);

	if (err) {
		dev_err(&pdev->dev, "Failed to request PCI regions\n");
		goto err_out_free_dev;
	}

	ioaddr = pci_iomap(pdev, bar, io_size);
	if (!ioaddr) {
		dev_err(&pdev->dev, "ioremap failed for device\n");
		err = -EIO;
		goto err_out_free_res;
	}

	/* If PHY status change register is still set to zero it means the
	 * bootloader didn't initialize it, so we set it to:
	 * - enable phy status change
	 * - enable all phy addresses
	 * - set to lowest timer divider */
	if (ioread16(ioaddr + PHY_CC) == 0)
		iowrite16(SCEN | PHY_MAX_ADDR << PHYAD_SHIFT |
				7 << TMRDIV_SHIFT, ioaddr + PHY_CC);

	/* Init system & device */
	lp->base = ioaddr;
	dev->irq = pdev->irq;

	spin_lock_init(&lp->lock);
	pci_set_drvdata(pdev, dev);

	/* Set MAC address */
	card_idx++;

	adrp = (u16 *)dev->dev_addr;
	adrp[0] = ioread16(ioaddr + MID_0L);
	adrp[1] = ioread16(ioaddr + MID_0M);
	adrp[2] = ioread16(ioaddr + MID_0H);

	/* Some bootloader/BIOSes do not initialize
	 * MAC address, warn about that */
	if (!(adrp[0] || adrp[1] || adrp[2])) {
		netdev_warn(dev, "MAC address not initialized, "
					"generating random\n");
		eth_hw_addr_random(dev);
	}

	/* Link new device into r6040_root_dev */
	lp->pdev = pdev;
	lp->dev = dev;

	/* Init RDC private data */
	lp->mcr0 = MCR0_XMTEN | MCR0_RCVEN;

	/* The RDC-specific entries in the device structure. */
	dev->netdev_ops = &r6040_netdev_ops;
	dev->ethtool_ops = &netdev_ethtool_ops;
	dev->watchdog_timeo = TX_TIMEOUT;

	netif_napi_add(dev, &lp->napi, r6040_poll, 64);

	lp->mii_bus = mdiobus_alloc();
	if (!lp->mii_bus) {
		dev_err(&pdev->dev, "mdiobus_alloc() failed\n");
		err = -ENOMEM;
		goto err_out_unmap;
	}

	lp->mii_bus->priv = dev;
	lp->mii_bus->read = r6040_mdiobus_read;
	lp->mii_bus->write = r6040_mdiobus_write;
	lp->mii_bus->name = "r6040_eth_mii";
	snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
		dev_name(&pdev->dev), card_idx);

	err = mdiobus_register(lp->mii_bus);
	if (err) {
		dev_err(&pdev->dev, "failed to register MII bus\n");
		goto err_out_mdio;
	}

	err = r6040_mii_probe(dev);
	if (err) {
		dev_err(&pdev->dev, "failed to probe MII bus\n");
		goto err_out_mdio_unregister;
	}

	/* Register net device. After this dev->name assign */
	err = register_netdev(dev);
	if (err) {
		dev_err(&pdev->dev, "Failed to register net device\n");
		goto err_out_mdio_unregister;
	}
	return 0;

err_out_mdio_unregister:
	mdiobus_unregister(lp->mii_bus);
err_out_mdio:
	mdiobus_free(lp->mii_bus);
err_out_unmap:
	netif_napi_del(&lp->napi);
	pci_iounmap(pdev, ioaddr);
err_out_free_res:
	pci_release_regions(pdev);
err_out_free_dev:
	free_netdev(dev);
err_out_disable_dev:
	pci_disable_device(pdev);
err_out:
	return err;
}

static void r6040_remove_one(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	struct r6040_private *lp = netdev_priv(dev);

	unregister_netdev(dev);
	mdiobus_unregister(lp->mii_bus);
	mdiobus_free(lp->mii_bus);
	netif_napi_del(&lp->napi);
	pci_iounmap(pdev, lp->base);
	pci_release_regions(pdev);
	free_netdev(dev);
	pci_disable_device(pdev);
}


static const struct pci_device_id r6040_pci_tbl[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_RDC, 0x6040) },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, r6040_pci_tbl);

static struct pci_driver r6040_driver = {
	.name		= DRV_NAME,
	.id_table	= r6040_pci_tbl,
	.probe		= r6040_init_one,
	.remove		= r6040_remove_one,
};

module_pci_driver(r6040_driver);