summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/freescale/fec_mpc52xx.c
blob: 7b34d8c698dae663cd3ebf259e4918696b7c9585 (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
/*
 * Driver for the MPC5200 Fast Ethernet Controller
 *
 * Originally written by Dale Farnsworth <dfarnsworth@mvista.com> and
 * now maintained by Sylvain Munaut <tnt@246tNt.com>
 *
 * Copyright (C) 2007  Domen Puncer, Telargo, Inc.
 * Copyright (C) 2007  Sylvain Munaut <tnt@246tNt.com>
 * Copyright (C) 2003-2004  MontaVista, Software, Inc.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 *
 */

#include <linux/dma-mapping.h>
#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/crc32.h>
#include <linux/hardirq.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>

#include <asm/io.h>
#include <asm/delay.h>
#include <asm/mpc52xx.h>

#include <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/fec.h>

#include "fec_mpc52xx.h"

#define DRIVER_NAME "mpc52xx-fec"

/* Private driver data structure */
struct mpc52xx_fec_priv {
	struct net_device *ndev;
	int duplex;
	int speed;
	int r_irq;
	int t_irq;
	struct mpc52xx_fec __iomem *fec;
	struct bcom_task *rx_dmatsk;
	struct bcom_task *tx_dmatsk;
	spinlock_t lock;
	int msg_enable;

	/* MDIO link details */
	unsigned int mdio_speed;
	struct device_node *phy_node;
	struct phy_device *phydev;
	enum phy_state link;
	int seven_wire_mode;
};


static irqreturn_t mpc52xx_fec_interrupt(int, void *);
static irqreturn_t mpc52xx_fec_rx_interrupt(int, void *);
static irqreturn_t mpc52xx_fec_tx_interrupt(int, void *);
static void mpc52xx_fec_stop(struct net_device *dev);
static void mpc52xx_fec_start(struct net_device *dev);
static void mpc52xx_fec_reset(struct net_device *dev);

static u8 mpc52xx_fec_mac_addr[6];
module_param_array_named(mac, mpc52xx_fec_mac_addr, byte, NULL, 0);
MODULE_PARM_DESC(mac, "six hex digits, ie. 0x1,0x2,0xc0,0x01,0xba,0xbe");

#define MPC52xx_MESSAGES_DEFAULT ( NETIF_MSG_DRV | NETIF_MSG_PROBE | \
		NETIF_MSG_LINK | NETIF_MSG_IFDOWN | NETIF_MSG_IFUP)
static int debug = -1;	/* the above default */
module_param(debug, int, 0);
MODULE_PARM_DESC(debug, "debugging messages level");

static void mpc52xx_fec_tx_timeout(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	unsigned long flags;

	dev_warn(&dev->dev, "transmit timed out\n");

	spin_lock_irqsave(&priv->lock, flags);
	mpc52xx_fec_reset(dev);
	dev->stats.tx_errors++;
	spin_unlock_irqrestore(&priv->lock, flags);

	netif_wake_queue(dev);
}

static void mpc52xx_fec_set_paddr(struct net_device *dev, u8 *mac)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;

	out_be32(&fec->paddr1, *(u32 *)(&mac[0]));
	out_be32(&fec->paddr2, (*(u16 *)(&mac[4]) << 16) | FEC_PADDR2_TYPE);
}

static void mpc52xx_fec_get_paddr(struct net_device *dev, u8 *mac)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;

	*(u32 *)(&mac[0]) = in_be32(&fec->paddr1);
	*(u16 *)(&mac[4]) = in_be32(&fec->paddr2) >> 16;
}

static int mpc52xx_fec_set_mac_address(struct net_device *dev, void *addr)
{
	struct sockaddr *sock = addr;

	memcpy(dev->dev_addr, sock->sa_data, dev->addr_len);

	mpc52xx_fec_set_paddr(dev, sock->sa_data);
	return 0;
}

static void mpc52xx_fec_free_rx_buffers(struct net_device *dev, struct bcom_task *s)
{
	while (!bcom_queue_empty(s)) {
		struct bcom_fec_bd *bd;
		struct sk_buff *skb;

		skb = bcom_retrieve_buffer(s, NULL, (struct bcom_bd **)&bd);
		dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
				 DMA_FROM_DEVICE);
		kfree_skb(skb);
	}
}

static void
mpc52xx_fec_rx_submit(struct net_device *dev, struct sk_buff *rskb)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct bcom_fec_bd *bd;

	bd = (struct bcom_fec_bd *) bcom_prepare_next_buffer(priv->rx_dmatsk);
	bd->status = FEC_RX_BUFFER_SIZE;
	bd->skb_pa = dma_map_single(dev->dev.parent, rskb->data,
				    FEC_RX_BUFFER_SIZE, DMA_FROM_DEVICE);
	bcom_submit_next_buffer(priv->rx_dmatsk, rskb);
}

static int mpc52xx_fec_alloc_rx_buffers(struct net_device *dev, struct bcom_task *rxtsk)
{
	struct sk_buff *skb;

	while (!bcom_queue_full(rxtsk)) {
		skb = netdev_alloc_skb(dev, FEC_RX_BUFFER_SIZE);
		if (!skb)
			return -EAGAIN;

		/* zero out the initial receive buffers to aid debugging */
		memset(skb->data, 0, FEC_RX_BUFFER_SIZE);
		mpc52xx_fec_rx_submit(dev, skb);
	}
	return 0;
}

/* based on generic_adjust_link from fs_enet-main.c */
static void mpc52xx_fec_adjust_link(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct phy_device *phydev = priv->phydev;
	int new_state = 0;

	if (phydev->link != PHY_DOWN) {
		if (phydev->duplex != priv->duplex) {
			struct mpc52xx_fec __iomem *fec = priv->fec;
			u32 rcntrl;
			u32 tcntrl;

			new_state = 1;
			priv->duplex = phydev->duplex;

			rcntrl = in_be32(&fec->r_cntrl);
			tcntrl = in_be32(&fec->x_cntrl);

			rcntrl &= ~FEC_RCNTRL_DRT;
			tcntrl &= ~FEC_TCNTRL_FDEN;
			if (phydev->duplex == DUPLEX_FULL)
				tcntrl |= FEC_TCNTRL_FDEN;	/* FD enable */
			else
				rcntrl |= FEC_RCNTRL_DRT;	/* disable Rx on Tx (HD) */

			out_be32(&fec->r_cntrl, rcntrl);
			out_be32(&fec->x_cntrl, tcntrl);
		}

		if (phydev->speed != priv->speed) {
			new_state = 1;
			priv->speed = phydev->speed;
		}

		if (priv->link == PHY_DOWN) {
			new_state = 1;
			priv->link = phydev->link;
		}

	} else if (priv->link) {
		new_state = 1;
		priv->link = PHY_DOWN;
		priv->speed = 0;
		priv->duplex = -1;
	}

	if (new_state && netif_msg_link(priv))
		phy_print_status(phydev);
}

static int mpc52xx_fec_open(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	int err = -EBUSY;

	if (priv->phy_node) {
		priv->phydev = of_phy_connect(priv->ndev, priv->phy_node,
					      mpc52xx_fec_adjust_link, 0, 0);
		if (!priv->phydev) {
			dev_err(&dev->dev, "of_phy_connect failed\n");
			return -ENODEV;
		}
		phy_start(priv->phydev);
	}

	if (request_irq(dev->irq, mpc52xx_fec_interrupt, IRQF_SHARED,
	                DRIVER_NAME "_ctrl", dev)) {
		dev_err(&dev->dev, "ctrl interrupt request failed\n");
		goto free_phy;
	}
	if (request_irq(priv->r_irq, mpc52xx_fec_rx_interrupt, 0,
	                DRIVER_NAME "_rx", dev)) {
		dev_err(&dev->dev, "rx interrupt request failed\n");
		goto free_ctrl_irq;
	}
	if (request_irq(priv->t_irq, mpc52xx_fec_tx_interrupt, 0,
	                DRIVER_NAME "_tx", dev)) {
		dev_err(&dev->dev, "tx interrupt request failed\n");
		goto free_2irqs;
	}

	bcom_fec_rx_reset(priv->rx_dmatsk);
	bcom_fec_tx_reset(priv->tx_dmatsk);

	err = mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);
	if (err) {
		dev_err(&dev->dev, "mpc52xx_fec_alloc_rx_buffers failed\n");
		goto free_irqs;
	}

	bcom_enable(priv->rx_dmatsk);
	bcom_enable(priv->tx_dmatsk);

	mpc52xx_fec_start(dev);

	netif_start_queue(dev);

	return 0;

 free_irqs:
	free_irq(priv->t_irq, dev);
 free_2irqs:
	free_irq(priv->r_irq, dev);
 free_ctrl_irq:
	free_irq(dev->irq, dev);
 free_phy:
	if (priv->phydev) {
		phy_stop(priv->phydev);
		phy_disconnect(priv->phydev);
		priv->phydev = NULL;
	}

	return err;
}

static int mpc52xx_fec_close(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);

	netif_stop_queue(dev);

	mpc52xx_fec_stop(dev);

	mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);

	free_irq(dev->irq, dev);
	free_irq(priv->r_irq, dev);
	free_irq(priv->t_irq, dev);

	if (priv->phydev) {
		/* power down phy */
		phy_stop(priv->phydev);
		phy_disconnect(priv->phydev);
		priv->phydev = NULL;
	}

	return 0;
}

/* This will only be invoked if your driver is _not_ in XOFF state.
 * What this means is that you need not check it, and that this
 * invariant will hold if you make sure that the netif_*_queue()
 * calls are done at the proper times.
 */
static int mpc52xx_fec_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct bcom_fec_bd *bd;
	unsigned long flags;

	if (bcom_queue_full(priv->tx_dmatsk)) {
		if (net_ratelimit())
			dev_err(&dev->dev, "transmit queue overrun\n");
		return NETDEV_TX_BUSY;
	}

	spin_lock_irqsave(&priv->lock, flags);

	bd = (struct bcom_fec_bd *)
		bcom_prepare_next_buffer(priv->tx_dmatsk);

	bd->status = skb->len | BCOM_FEC_TX_BD_TFD | BCOM_FEC_TX_BD_TC;
	bd->skb_pa = dma_map_single(dev->dev.parent, skb->data, skb->len,
				    DMA_TO_DEVICE);

	skb_tx_timestamp(skb);
	bcom_submit_next_buffer(priv->tx_dmatsk, skb);
	spin_unlock_irqrestore(&priv->lock, flags);

	if (bcom_queue_full(priv->tx_dmatsk)) {
		netif_stop_queue(dev);
	}

	return NETDEV_TX_OK;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void mpc52xx_fec_poll_controller(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);

	disable_irq(priv->t_irq);
	mpc52xx_fec_tx_interrupt(priv->t_irq, dev);
	enable_irq(priv->t_irq);
	disable_irq(priv->r_irq);
	mpc52xx_fec_rx_interrupt(priv->r_irq, dev);
	enable_irq(priv->r_irq);
}
#endif


/* This handles BestComm transmit task interrupts
 */
static irqreturn_t mpc52xx_fec_tx_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);

	spin_lock(&priv->lock);
	while (bcom_buffer_done(priv->tx_dmatsk)) {
		struct sk_buff *skb;
		struct bcom_fec_bd *bd;
		skb = bcom_retrieve_buffer(priv->tx_dmatsk, NULL,
				(struct bcom_bd **)&bd);
		dma_unmap_single(dev->dev.parent, bd->skb_pa, skb->len,
				 DMA_TO_DEVICE);

		dev_kfree_skb_irq(skb);
	}
	spin_unlock(&priv->lock);

	netif_wake_queue(dev);

	return IRQ_HANDLED;
}

static irqreturn_t mpc52xx_fec_rx_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct sk_buff *rskb; /* received sk_buff */
	struct sk_buff *skb;  /* new sk_buff to enqueue in its place */
	struct bcom_fec_bd *bd;
	u32 status, physaddr;
	int length;

	spin_lock(&priv->lock);

	while (bcom_buffer_done(priv->rx_dmatsk)) {

		rskb = bcom_retrieve_buffer(priv->rx_dmatsk, &status,
					    (struct bcom_bd **)&bd);
		physaddr = bd->skb_pa;

		/* Test for errors in received frame */
		if (status & BCOM_FEC_RX_BD_ERRORS) {
			/* Drop packet and reuse the buffer */
			mpc52xx_fec_rx_submit(dev, rskb);
			dev->stats.rx_dropped++;
			continue;
		}

		/* skbs are allocated on open, so now we allocate a new one,
		 * and remove the old (with the packet) */
		skb = netdev_alloc_skb(dev, FEC_RX_BUFFER_SIZE);
		if (!skb) {
			/* Can't get a new one : reuse the same & drop pkt */
			dev_notice(&dev->dev, "Low memory - dropped packet.\n");
			mpc52xx_fec_rx_submit(dev, rskb);
			dev->stats.rx_dropped++;
			continue;
		}

		/* Enqueue the new sk_buff back on the hardware */
		mpc52xx_fec_rx_submit(dev, skb);

		/* Process the received skb - Drop the spin lock while
		 * calling into the network stack */
		spin_unlock(&priv->lock);

		dma_unmap_single(dev->dev.parent, physaddr, rskb->len,
				 DMA_FROM_DEVICE);
		length = status & BCOM_FEC_RX_BD_LEN_MASK;
		skb_put(rskb, length - 4);	/* length without CRC32 */
		rskb->protocol = eth_type_trans(rskb, dev);
		if (!skb_defer_rx_timestamp(skb))
			netif_rx(rskb);

		spin_lock(&priv->lock);
	}

	spin_unlock(&priv->lock);

	return IRQ_HANDLED;
}

static irqreturn_t mpc52xx_fec_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = dev_id;
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;
	u32 ievent;

	ievent = in_be32(&fec->ievent);

	ievent &= ~FEC_IEVENT_MII;	/* mii is handled separately */
	if (!ievent)
		return IRQ_NONE;

	out_be32(&fec->ievent, ievent);		/* clear pending events */

	/* on fifo error, soft-reset fec */
	if (ievent & (FEC_IEVENT_RFIFO_ERROR | FEC_IEVENT_XFIFO_ERROR)) {

		if (net_ratelimit() && (ievent & FEC_IEVENT_RFIFO_ERROR))
			dev_warn(&dev->dev, "FEC_IEVENT_RFIFO_ERROR\n");
		if (net_ratelimit() && (ievent & FEC_IEVENT_XFIFO_ERROR))
			dev_warn(&dev->dev, "FEC_IEVENT_XFIFO_ERROR\n");

		spin_lock(&priv->lock);
		mpc52xx_fec_reset(dev);
		spin_unlock(&priv->lock);

		return IRQ_HANDLED;
	}

	if (ievent & ~FEC_IEVENT_TFINT)
		dev_dbg(&dev->dev, "ievent: %08x\n", ievent);

	return IRQ_HANDLED;
}

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *mpc52xx_fec_get_stats(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct net_device_stats *stats = &dev->stats;
	struct mpc52xx_fec __iomem *fec = priv->fec;

	stats->rx_bytes = in_be32(&fec->rmon_r_octets);
	stats->rx_packets = in_be32(&fec->rmon_r_packets);
	stats->rx_errors = in_be32(&fec->rmon_r_crc_align) +
		in_be32(&fec->rmon_r_undersize) +
		in_be32(&fec->rmon_r_oversize) +
		in_be32(&fec->rmon_r_frag) +
		in_be32(&fec->rmon_r_jab);

	stats->tx_bytes = in_be32(&fec->rmon_t_octets);
	stats->tx_packets = in_be32(&fec->rmon_t_packets);
	stats->tx_errors = in_be32(&fec->rmon_t_crc_align) +
		in_be32(&fec->rmon_t_undersize) +
		in_be32(&fec->rmon_t_oversize) +
		in_be32(&fec->rmon_t_frag) +
		in_be32(&fec->rmon_t_jab);

	stats->multicast = in_be32(&fec->rmon_r_mc_pkt);
	stats->collisions = in_be32(&fec->rmon_t_col);

	/* detailed rx_errors: */
	stats->rx_length_errors = in_be32(&fec->rmon_r_undersize)
					+ in_be32(&fec->rmon_r_oversize)
					+ in_be32(&fec->rmon_r_frag)
					+ in_be32(&fec->rmon_r_jab);
	stats->rx_over_errors = in_be32(&fec->r_macerr);
	stats->rx_crc_errors = in_be32(&fec->ieee_r_crc);
	stats->rx_frame_errors = in_be32(&fec->ieee_r_align);
	stats->rx_fifo_errors = in_be32(&fec->rmon_r_drop);
	stats->rx_missed_errors = in_be32(&fec->rmon_r_drop);

	/* detailed tx_errors: */
	stats->tx_aborted_errors = 0;
	stats->tx_carrier_errors = in_be32(&fec->ieee_t_cserr);
	stats->tx_fifo_errors = in_be32(&fec->rmon_t_drop);
	stats->tx_heartbeat_errors = in_be32(&fec->ieee_t_sqe);
	stats->tx_window_errors = in_be32(&fec->ieee_t_lcol);

	return stats;
}

/*
 * Read MIB counters in order to reset them,
 * then zero all the stats fields in memory
 */
static void mpc52xx_fec_reset_stats(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;

	out_be32(&fec->mib_control, FEC_MIB_DISABLE);
	memset_io(&fec->rmon_t_drop, 0,
		   offsetof(struct mpc52xx_fec, reserved10) -
		   offsetof(struct mpc52xx_fec, rmon_t_drop));
	out_be32(&fec->mib_control, 0);

	memset(&dev->stats, 0, sizeof(dev->stats));
}

/*
 * Set or clear the multicast filter for this adaptor.
 */
static void mpc52xx_fec_set_multicast_list(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;
	u32 rx_control;

	rx_control = in_be32(&fec->r_cntrl);

	if (dev->flags & IFF_PROMISC) {
		rx_control |= FEC_RCNTRL_PROM;
		out_be32(&fec->r_cntrl, rx_control);
	} else {
		rx_control &= ~FEC_RCNTRL_PROM;
		out_be32(&fec->r_cntrl, rx_control);

		if (dev->flags & IFF_ALLMULTI) {
			out_be32(&fec->gaddr1, 0xffffffff);
			out_be32(&fec->gaddr2, 0xffffffff);
		} else {
			u32 crc;
			struct netdev_hw_addr *ha;
			u32 gaddr1 = 0x00000000;
			u32 gaddr2 = 0x00000000;

			netdev_for_each_mc_addr(ha, dev) {
				crc = ether_crc_le(6, ha->addr) >> 26;
				if (crc >= 32)
					gaddr1 |= 1 << (crc-32);
				else
					gaddr2 |= 1 << crc;
			}
			out_be32(&fec->gaddr1, gaddr1);
			out_be32(&fec->gaddr2, gaddr2);
		}
	}
}

/**
 * mpc52xx_fec_hw_init
 * @dev: network device
 *
 * Setup various hardware setting, only needed once on start
 */
static void mpc52xx_fec_hw_init(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;
	int i;

	/* Whack a reset.  We should wait for this. */
	out_be32(&fec->ecntrl, FEC_ECNTRL_RESET);
	for (i = 0; i < FEC_RESET_DELAY; ++i) {
		if ((in_be32(&fec->ecntrl) & FEC_ECNTRL_RESET) == 0)
			break;
		udelay(1);
	}
	if (i == FEC_RESET_DELAY)
		dev_err(&dev->dev, "FEC Reset timeout!\n");

	/* set pause to 0x20 frames */
	out_be32(&fec->op_pause, FEC_OP_PAUSE_OPCODE | 0x20);

	/* high service request will be deasserted when there's < 7 bytes in fifo
	 * low service request will be deasserted when there's < 4*7 bytes in fifo
	 */
	out_be32(&fec->rfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);
	out_be32(&fec->tfifo_cntrl, FEC_FIFO_CNTRL_FRAME | FEC_FIFO_CNTRL_LTG_7);

	/* alarm when <= x bytes in FIFO */
	out_be32(&fec->rfifo_alarm, 0x0000030c);
	out_be32(&fec->tfifo_alarm, 0x00000100);

	/* begin transmittion when 256 bytes are in FIFO (or EOF or FIFO full) */
	out_be32(&fec->x_wmrk, FEC_FIFO_WMRK_256B);

	/* enable crc generation */
	out_be32(&fec->xmit_fsm, FEC_XMIT_FSM_APPEND_CRC | FEC_XMIT_FSM_ENABLE_CRC);
	out_be32(&fec->iaddr1, 0x00000000);	/* No individual filter */
	out_be32(&fec->iaddr2, 0x00000000);	/* No individual filter */

	/* set phy speed.
	 * this can't be done in phy driver, since it needs to be called
	 * before fec stuff (even on resume) */
	out_be32(&fec->mii_speed, priv->mdio_speed);
}

/**
 * mpc52xx_fec_start
 * @dev: network device
 *
 * This function is called to start or restart the FEC during a link
 * change.  This happens on fifo errors or when switching between half
 * and full duplex.
 */
static void mpc52xx_fec_start(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;
	u32 rcntrl;
	u32 tcntrl;
	u32 tmp;

	/* clear sticky error bits */
	tmp = FEC_FIFO_STATUS_ERR | FEC_FIFO_STATUS_UF | FEC_FIFO_STATUS_OF;
	out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status) & tmp);
	out_be32(&fec->tfifo_status, in_be32(&fec->tfifo_status) & tmp);

	/* FIFOs will reset on mpc52xx_fec_enable */
	out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_ENABLE_IS_RESET);

	/* Set station address. */
	mpc52xx_fec_set_paddr(dev, dev->dev_addr);

	mpc52xx_fec_set_multicast_list(dev);

	/* set max frame len, enable flow control, select mii mode */
	rcntrl = FEC_RX_BUFFER_SIZE << 16;	/* max frame length */
	rcntrl |= FEC_RCNTRL_FCE;

	if (!priv->seven_wire_mode)
		rcntrl |= FEC_RCNTRL_MII_MODE;

	if (priv->duplex == DUPLEX_FULL)
		tcntrl = FEC_TCNTRL_FDEN;	/* FD enable */
	else {
		rcntrl |= FEC_RCNTRL_DRT;	/* disable Rx on Tx (HD) */
		tcntrl = 0;
	}
	out_be32(&fec->r_cntrl, rcntrl);
	out_be32(&fec->x_cntrl, tcntrl);

	/* Clear any outstanding interrupt. */
	out_be32(&fec->ievent, 0xffffffff);

	/* Enable interrupts we wish to service. */
	out_be32(&fec->imask, FEC_IMASK_ENABLE);

	/* And last, enable the transmit and receive processing. */
	out_be32(&fec->ecntrl, FEC_ECNTRL_ETHER_EN);
	out_be32(&fec->r_des_active, 0x01000000);
}

/**
 * mpc52xx_fec_stop
 * @dev: network device
 *
 * stop all activity on fec and empty dma buffers
 */
static void mpc52xx_fec_stop(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;
	unsigned long timeout;

	/* disable all interrupts */
	out_be32(&fec->imask, 0);

	/* Disable the rx task. */
	bcom_disable(priv->rx_dmatsk);

	/* Wait for tx queue to drain, but only if we're in process context */
	if (!in_interrupt()) {
		timeout = jiffies + msecs_to_jiffies(2000);
		while (time_before(jiffies, timeout) &&
				!bcom_queue_empty(priv->tx_dmatsk))
			msleep(100);

		if (time_after_eq(jiffies, timeout))
			dev_err(&dev->dev, "queues didn't drain\n");
#if 1
		if (time_after_eq(jiffies, timeout)) {
			dev_err(&dev->dev, "  tx: index: %i, outdex: %i\n",
					priv->tx_dmatsk->index,
					priv->tx_dmatsk->outdex);
			dev_err(&dev->dev, "  rx: index: %i, outdex: %i\n",
					priv->rx_dmatsk->index,
					priv->rx_dmatsk->outdex);
		}
#endif
	}

	bcom_disable(priv->tx_dmatsk);

	/* Stop FEC */
	out_be32(&fec->ecntrl, in_be32(&fec->ecntrl) & ~FEC_ECNTRL_ETHER_EN);
}

/* reset fec and bestcomm tasks */
static void mpc52xx_fec_reset(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	struct mpc52xx_fec __iomem *fec = priv->fec;

	mpc52xx_fec_stop(dev);

	out_be32(&fec->rfifo_status, in_be32(&fec->rfifo_status));
	out_be32(&fec->reset_cntrl, FEC_RESET_CNTRL_RESET_FIFO);

	mpc52xx_fec_free_rx_buffers(dev, priv->rx_dmatsk);

	mpc52xx_fec_hw_init(dev);

	bcom_fec_rx_reset(priv->rx_dmatsk);
	bcom_fec_tx_reset(priv->tx_dmatsk);

	mpc52xx_fec_alloc_rx_buffers(dev, priv->rx_dmatsk);

	bcom_enable(priv->rx_dmatsk);
	bcom_enable(priv->tx_dmatsk);

	mpc52xx_fec_start(dev);

	netif_wake_queue(dev);
}


/* ethtool interface */

static int mpc52xx_fec_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);

	if (!priv->phydev)
		return -ENODEV;

	return phy_ethtool_gset(priv->phydev, cmd);
}

static int mpc52xx_fec_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);

	if (!priv->phydev)
		return -ENODEV;

	return phy_ethtool_sset(priv->phydev, cmd);
}

static u32 mpc52xx_fec_get_msglevel(struct net_device *dev)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	return priv->msg_enable;
}

static void mpc52xx_fec_set_msglevel(struct net_device *dev, u32 level)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);
	priv->msg_enable = level;
}

static const struct ethtool_ops mpc52xx_fec_ethtool_ops = {
	.get_settings = mpc52xx_fec_get_settings,
	.set_settings = mpc52xx_fec_set_settings,
	.get_link = ethtool_op_get_link,
	.get_msglevel = mpc52xx_fec_get_msglevel,
	.set_msglevel = mpc52xx_fec_set_msglevel,
};


static int mpc52xx_fec_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct mpc52xx_fec_priv *priv = netdev_priv(dev);

	if (!priv->phydev)
		return -ENOTSUPP;

	return phy_mii_ioctl(priv->phydev, rq, cmd);
}

static const struct net_device_ops mpc52xx_fec_netdev_ops = {
	.ndo_open = mpc52xx_fec_open,
	.ndo_stop = mpc52xx_fec_close,
	.ndo_start_xmit = mpc52xx_fec_start_xmit,
	.ndo_set_rx_mode = mpc52xx_fec_set_multicast_list,
	.ndo_set_mac_address = mpc52xx_fec_set_mac_address,
	.ndo_validate_addr = eth_validate_addr,
	.ndo_do_ioctl = mpc52xx_fec_ioctl,
	.ndo_change_mtu = eth_change_mtu,
	.ndo_tx_timeout = mpc52xx_fec_tx_timeout,
	.ndo_get_stats = mpc52xx_fec_get_stats,
#ifdef CONFIG_NET_POLL_CONTROLLER
	.ndo_poll_controller = mpc52xx_fec_poll_controller,
#endif
};

/* ======================================================================== */
/* OF Driver                                                                */
/* ======================================================================== */

static int __devinit mpc52xx_fec_probe(struct platform_device *op)
{
	int rv;
	struct net_device *ndev;
	struct mpc52xx_fec_priv *priv = NULL;
	struct resource mem;
	const u32 *prop;
	int prop_size;

	phys_addr_t rx_fifo;
	phys_addr_t tx_fifo;

	/* Get the ether ndev & it's private zone */
	ndev = alloc_etherdev(sizeof(struct mpc52xx_fec_priv));
	if (!ndev)
		return -ENOMEM;

	priv = netdev_priv(ndev);
	priv->ndev = ndev;

	/* Reserve FEC control zone */
	rv = of_address_to_resource(op->dev.of_node, 0, &mem);
	if (rv) {
		printk(KERN_ERR DRIVER_NAME ": "
				"Error while parsing device node resource\n" );
		goto err_netdev;
	}
	if (resource_size(&mem) < sizeof(struct mpc52xx_fec)) {
		printk(KERN_ERR DRIVER_NAME
		       " - invalid resource size (%lx < %x), check mpc52xx_devices.c\n",
		       (unsigned long)resource_size(&mem),
		       sizeof(struct mpc52xx_fec));
		rv = -EINVAL;
		goto err_netdev;
	}

	if (!request_mem_region(mem.start, sizeof(struct mpc52xx_fec),
				DRIVER_NAME)) {
		rv = -EBUSY;
		goto err_netdev;
	}

	/* Init ether ndev with what we have */
	ndev->netdev_ops	= &mpc52xx_fec_netdev_ops;
	ndev->ethtool_ops	= &mpc52xx_fec_ethtool_ops;
	ndev->watchdog_timeo	= FEC_WATCHDOG_TIMEOUT;
	ndev->base_addr		= mem.start;
	SET_NETDEV_DEV(ndev, &op->dev);

	spin_lock_init(&priv->lock);

	/* ioremap the zones */
	priv->fec = ioremap(mem.start, sizeof(struct mpc52xx_fec));

	if (!priv->fec) {
		rv = -ENOMEM;
		goto err_mem_region;
	}

	/* Bestcomm init */
	rx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, rfifo_data);
	tx_fifo = ndev->base_addr + offsetof(struct mpc52xx_fec, tfifo_data);

	priv->rx_dmatsk = bcom_fec_rx_init(FEC_RX_NUM_BD, rx_fifo, FEC_RX_BUFFER_SIZE);
	priv->tx_dmatsk = bcom_fec_tx_init(FEC_TX_NUM_BD, tx_fifo);

	if (!priv->rx_dmatsk || !priv->tx_dmatsk) {
		printk(KERN_ERR DRIVER_NAME ": Can not init SDMA tasks\n" );
		rv = -ENOMEM;
		goto err_rx_tx_dmatsk;
	}

	/* Get the IRQ we need one by one */
		/* Control */
	ndev->irq = irq_of_parse_and_map(op->dev.of_node, 0);

		/* RX */
	priv->r_irq = bcom_get_task_irq(priv->rx_dmatsk);

		/* TX */
	priv->t_irq = bcom_get_task_irq(priv->tx_dmatsk);

	/* MAC address init */
	if (!is_zero_ether_addr(mpc52xx_fec_mac_addr))
		memcpy(ndev->dev_addr, mpc52xx_fec_mac_addr, 6);
	else
		mpc52xx_fec_get_paddr(ndev, ndev->dev_addr);

	priv->msg_enable = netif_msg_init(debug, MPC52xx_MESSAGES_DEFAULT);

	/*
	 * Link mode configuration
	 */

	/* Start with safe defaults for link connection */
	priv->speed = 100;
	priv->duplex = DUPLEX_HALF;
	priv->mdio_speed = ((mpc5xxx_get_bus_frequency(op->dev.of_node) >> 20) / 5) << 1;

	/* The current speed preconfigures the speed of the MII link */
	prop = of_get_property(op->dev.of_node, "current-speed", &prop_size);
	if (prop && (prop_size >= sizeof(u32) * 2)) {
		priv->speed = prop[0];
		priv->duplex = prop[1] ? DUPLEX_FULL : DUPLEX_HALF;
	}

	/* If there is a phy handle, then get the PHY node */
	priv->phy_node = of_parse_phandle(op->dev.of_node, "phy-handle", 0);

	/* the 7-wire property means don't use MII mode */
	if (of_find_property(op->dev.of_node, "fsl,7-wire-mode", NULL)) {
		priv->seven_wire_mode = 1;
		dev_info(&ndev->dev, "using 7-wire PHY mode\n");
	}

	/* Hardware init */
	mpc52xx_fec_hw_init(ndev);
	mpc52xx_fec_reset_stats(ndev);

	rv = register_netdev(ndev);
	if (rv < 0)
		goto err_node;

	/* We're done ! */
	dev_set_drvdata(&op->dev, ndev);

	return 0;

err_node:
	of_node_put(priv->phy_node);
	irq_dispose_mapping(ndev->irq);
err_rx_tx_dmatsk:
	if (priv->rx_dmatsk)
		bcom_fec_rx_release(priv->rx_dmatsk);
	if (priv->tx_dmatsk)
		bcom_fec_tx_release(priv->tx_dmatsk);
	iounmap(priv->fec);
err_mem_region:
	release_mem_region(mem.start, sizeof(struct mpc52xx_fec));
err_netdev:
	free_netdev(ndev);

	return rv;
}

static int
mpc52xx_fec_remove(struct platform_device *op)
{
	struct net_device *ndev;
	struct mpc52xx_fec_priv *priv;

	ndev = dev_get_drvdata(&op->dev);
	priv = netdev_priv(ndev);

	unregister_netdev(ndev);

	if (priv->phy_node)
		of_node_put(priv->phy_node);
	priv->phy_node = NULL;

	irq_dispose_mapping(ndev->irq);

	bcom_fec_rx_release(priv->rx_dmatsk);
	bcom_fec_tx_release(priv->tx_dmatsk);

	iounmap(priv->fec);

	release_mem_region(ndev->base_addr, sizeof(struct mpc52xx_fec));

	free_netdev(ndev);

	dev_set_drvdata(&op->dev, NULL);
	return 0;
}

#ifdef CONFIG_PM
static int mpc52xx_fec_of_suspend(struct platform_device *op, pm_message_t state)
{
	struct net_device *dev = dev_get_drvdata(&op->dev);

	if (netif_running(dev))
		mpc52xx_fec_close(dev);

	return 0;
}

static int mpc52xx_fec_of_resume(struct platform_device *op)
{
	struct net_device *dev = dev_get_drvdata(&op->dev);

	mpc52xx_fec_hw_init(dev);
	mpc52xx_fec_reset_stats(dev);

	if (netif_running(dev))
		mpc52xx_fec_open(dev);

	return 0;
}
#endif

static struct of_device_id mpc52xx_fec_match[] = {
	{ .compatible = "fsl,mpc5200b-fec", },
	{ .compatible = "fsl,mpc5200-fec", },
	{ .compatible = "mpc5200-fec", },
	{ }
};

MODULE_DEVICE_TABLE(of, mpc52xx_fec_match);

static struct platform_driver mpc52xx_fec_driver = {
	.driver = {
		.name = DRIVER_NAME,
		.owner = THIS_MODULE,
		.of_match_table = mpc52xx_fec_match,
	},
	.probe		= mpc52xx_fec_probe,
	.remove		= mpc52xx_fec_remove,
#ifdef CONFIG_PM
	.suspend	= mpc52xx_fec_of_suspend,
	.resume		= mpc52xx_fec_of_resume,
#endif
};


/* ======================================================================== */
/* Module                                                                   */
/* ======================================================================== */

static int __init
mpc52xx_fec_init(void)
{
#ifdef CONFIG_FEC_MPC52xx_MDIO
	int ret;
	ret = platform_driver_register(&mpc52xx_fec_mdio_driver);
	if (ret) {
		printk(KERN_ERR DRIVER_NAME ": failed to register mdio driver\n");
		return ret;
	}
#endif
	return platform_driver_register(&mpc52xx_fec_driver);
}

static void __exit
mpc52xx_fec_exit(void)
{
	platform_driver_unregister(&mpc52xx_fec_driver);
#ifdef CONFIG_FEC_MPC52xx_MDIO
	platform_driver_unregister(&mpc52xx_fec_mdio_driver);
#endif
}


module_init(mpc52xx_fec_init);
module_exit(mpc52xx_fec_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dale Farnsworth");
MODULE_DESCRIPTION("Ethernet driver for the Freescale MPC52xx FEC");