aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/can/ifi_canfd/ifi_canfd.c
blob: 481895b2f9f4d5ed87f4df6621cfb51e67277046 (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
/*
 * CAN bus driver for IFI CANFD controller
 *
 * Copyright (C) 2016 Marek Vasut <marex@denx.de>
 *
 * Details about this controller can be found at
 * http://www.ifi-pld.de/IP/CANFD/canfd.html
 *
 * 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/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

#include <linux/can/dev.h>

#define IFI_CANFD_STCMD				0x0
#define IFI_CANFD_STCMD_HARDRESET		0xDEADCAFD
#define IFI_CANFD_STCMD_ENABLE			BIT(0)
#define IFI_CANFD_STCMD_ERROR_ACTIVE		BIT(2)
#define IFI_CANFD_STCMD_ERROR_PASSIVE		BIT(3)
#define IFI_CANFD_STCMD_BUSOFF			BIT(4)
#define IFI_CANFD_STCMD_BUSMONITOR		BIT(16)
#define IFI_CANFD_STCMD_LOOPBACK		BIT(18)
#define IFI_CANFD_STCMD_DISABLE_CANFD		BIT(24)
#define IFI_CANFD_STCMD_ENABLE_ISO		BIT(25)
#define IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING	BIT(26)
#define IFI_CANFD_STCMD_NORMAL_MODE		((u32)BIT(31))

#define IFI_CANFD_RXSTCMD			0x4
#define IFI_CANFD_RXSTCMD_REMOVE_MSG		BIT(0)
#define IFI_CANFD_RXSTCMD_RESET			BIT(7)
#define IFI_CANFD_RXSTCMD_EMPTY			BIT(8)
#define IFI_CANFD_RXSTCMD_OVERFLOW		BIT(13)

#define IFI_CANFD_TXSTCMD			0x8
#define IFI_CANFD_TXSTCMD_ADD_MSG		BIT(0)
#define IFI_CANFD_TXSTCMD_HIGH_PRIO		BIT(1)
#define IFI_CANFD_TXSTCMD_RESET			BIT(7)
#define IFI_CANFD_TXSTCMD_EMPTY			BIT(8)
#define IFI_CANFD_TXSTCMD_FULL			BIT(12)
#define IFI_CANFD_TXSTCMD_OVERFLOW		BIT(13)

#define IFI_CANFD_INTERRUPT			0xc
#define IFI_CANFD_INTERRUPT_ERROR_WARNING	BIT(1)
#define IFI_CANFD_INTERRUPT_ERROR_COUNTER	BIT(10)
#define IFI_CANFD_INTERRUPT_TXFIFO_EMPTY	BIT(16)
#define IFI_CANFD_INTERRUPT_TXFIFO_REMOVE	BIT(22)
#define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY	BIT(24)
#define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER	BIT(25)
#define IFI_CANFD_INTERRUPT_SET_IRQ		((u32)BIT(31))

#define IFI_CANFD_IRQMASK			0x10
#define IFI_CANFD_IRQMASK_SET_ERR		BIT(7)
#define IFI_CANFD_IRQMASK_SET_TS		BIT(15)
#define IFI_CANFD_IRQMASK_TXFIFO_EMPTY		BIT(16)
#define IFI_CANFD_IRQMASK_SET_TX		BIT(23)
#define IFI_CANFD_IRQMASK_RXFIFO_NEMPTY		BIT(24)
#define IFI_CANFD_IRQMASK_SET_RX		((u32)BIT(31))

#define IFI_CANFD_TIME				0x14
#define IFI_CANFD_FTIME				0x18
#define IFI_CANFD_TIME_TIMEB_OFF		0
#define IFI_CANFD_TIME_TIMEA_OFF		8
#define IFI_CANFD_TIME_PRESCALE_OFF		16
#define IFI_CANFD_TIME_SJW_OFF_7_9_8_8		25
#define IFI_CANFD_TIME_SJW_OFF_4_12_6_6		28
#define IFI_CANFD_TIME_SET_SJW_4_12_6_6		BIT(6)
#define IFI_CANFD_TIME_SET_TIMEB_4_12_6_6	BIT(7)
#define IFI_CANFD_TIME_SET_PRESC_4_12_6_6	BIT(14)
#define IFI_CANFD_TIME_SET_TIMEA_4_12_6_6	BIT(15)

#define IFI_CANFD_TDELAY			0x1c
#define IFI_CANFD_TDELAY_DEFAULT		0xb
#define IFI_CANFD_TDELAY_MASK			0x3fff
#define IFI_CANFD_TDELAY_ABS			BIT(14)
#define IFI_CANFD_TDELAY_EN			BIT(15)

#define IFI_CANFD_ERROR				0x20
#define IFI_CANFD_ERROR_TX_OFFSET		0
#define IFI_CANFD_ERROR_TX_MASK			0xff
#define IFI_CANFD_ERROR_RX_OFFSET		16
#define IFI_CANFD_ERROR_RX_MASK			0xff

#define IFI_CANFD_ERRCNT			0x24

#define IFI_CANFD_SUSPEND			0x28

#define IFI_CANFD_REPEAT			0x2c

#define IFI_CANFD_TRAFFIC			0x30

#define IFI_CANFD_TSCONTROL			0x34

#define IFI_CANFD_TSC				0x38

#define IFI_CANFD_TST				0x3c

#define IFI_CANFD_RES1				0x40

#define IFI_CANFD_ERROR_CTR			0x44
#define IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC	0x21302899
#define IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST	BIT(0)
#define IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST	BIT(1)
#define IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST	BIT(2)
#define IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST	BIT(3)
#define IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST	BIT(4)
#define IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST	BIT(5)
#define IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST	BIT(6)
#define IFI_CANFD_ERROR_CTR_OVERLOAD_ALL	BIT(8)
#define IFI_CANFD_ERROR_CTR_ACK_ERROR_ALL	BIT(9)
#define IFI_CANFD_ERROR_CTR_BIT0_ERROR_ALL	BIT(10)
#define IFI_CANFD_ERROR_CTR_BIT1_ERROR_ALL	BIT(11)
#define IFI_CANFD_ERROR_CTR_STUFF_ERROR_ALL	BIT(12)
#define IFI_CANFD_ERROR_CTR_CRC_ERROR_ALL	BIT(13)
#define IFI_CANFD_ERROR_CTR_FORM_ERROR_ALL	BIT(14)
#define IFI_CANFD_ERROR_CTR_BITPOSITION_OFFSET	16
#define IFI_CANFD_ERROR_CTR_BITPOSITION_MASK	0xff
#define IFI_CANFD_ERROR_CTR_ER_RESET		BIT(30)
#define IFI_CANFD_ERROR_CTR_ER_ENABLE		((u32)BIT(31))

#define IFI_CANFD_PAR				0x48

#define IFI_CANFD_CANCLOCK			0x4c

#define IFI_CANFD_SYSCLOCK			0x50

#define IFI_CANFD_VER				0x54

#define IFI_CANFD_IP_ID				0x58
#define IFI_CANFD_IP_ID_VALUE			0xD073CAFD

#define IFI_CANFD_TEST				0x5c

#define IFI_CANFD_RXFIFO_TS_63_32		0x60

#define IFI_CANFD_RXFIFO_TS_31_0		0x64

#define IFI_CANFD_RXFIFO_DLC			0x68
#define IFI_CANFD_RXFIFO_DLC_DLC_OFFSET		0
#define IFI_CANFD_RXFIFO_DLC_DLC_MASK		0xf
#define IFI_CANFD_RXFIFO_DLC_RTR		BIT(4)
#define IFI_CANFD_RXFIFO_DLC_EDL		BIT(5)
#define IFI_CANFD_RXFIFO_DLC_BRS		BIT(6)
#define IFI_CANFD_RXFIFO_DLC_ESI		BIT(7)
#define IFI_CANFD_RXFIFO_DLC_OBJ_OFFSET		8
#define IFI_CANFD_RXFIFO_DLC_OBJ_MASK		0x1ff
#define IFI_CANFD_RXFIFO_DLC_FNR_OFFSET		24
#define IFI_CANFD_RXFIFO_DLC_FNR_MASK		0xff

#define IFI_CANFD_RXFIFO_ID			0x6c
#define IFI_CANFD_RXFIFO_ID_ID_OFFSET		0
#define IFI_CANFD_RXFIFO_ID_ID_STD_MASK		CAN_SFF_MASK
#define IFI_CANFD_RXFIFO_ID_ID_STD_OFFSET	0
#define IFI_CANFD_RXFIFO_ID_ID_STD_WIDTH	10
#define IFI_CANFD_RXFIFO_ID_ID_XTD_MASK		CAN_EFF_MASK
#define IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET	11
#define IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH	18
#define IFI_CANFD_RXFIFO_ID_IDE			BIT(29)

#define IFI_CANFD_RXFIFO_DATA			0x70	/* 0x70..0xac */

#define IFI_CANFD_TXFIFO_SUSPEND_US		0xb0

#define IFI_CANFD_TXFIFO_REPEATCOUNT		0xb4

#define IFI_CANFD_TXFIFO_DLC			0xb8
#define IFI_CANFD_TXFIFO_DLC_DLC_OFFSET		0
#define IFI_CANFD_TXFIFO_DLC_DLC_MASK		0xf
#define IFI_CANFD_TXFIFO_DLC_RTR		BIT(4)
#define IFI_CANFD_TXFIFO_DLC_EDL		BIT(5)
#define IFI_CANFD_TXFIFO_DLC_BRS		BIT(6)
#define IFI_CANFD_TXFIFO_DLC_FNR_OFFSET		24
#define IFI_CANFD_TXFIFO_DLC_FNR_MASK		0xff

#define IFI_CANFD_TXFIFO_ID			0xbc
#define IFI_CANFD_TXFIFO_ID_ID_OFFSET		0
#define IFI_CANFD_TXFIFO_ID_ID_STD_MASK		CAN_SFF_MASK
#define IFI_CANFD_TXFIFO_ID_ID_STD_OFFSET	0
#define IFI_CANFD_TXFIFO_ID_ID_STD_WIDTH	10
#define IFI_CANFD_TXFIFO_ID_ID_XTD_MASK		CAN_EFF_MASK
#define IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET	11
#define IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH	18
#define IFI_CANFD_TXFIFO_ID_IDE			BIT(29)

#define IFI_CANFD_TXFIFO_DATA			0xc0	/* 0xb0..0xfc */

#define IFI_CANFD_FILTER_MASK(n)		(0x800 + ((n) * 8) + 0)
#define IFI_CANFD_FILTER_MASK_EXT		BIT(29)
#define IFI_CANFD_FILTER_MASK_EDL		BIT(30)
#define IFI_CANFD_FILTER_MASK_VALID		((u32)BIT(31))

#define IFI_CANFD_FILTER_IDENT(n)		(0x800 + ((n) * 8) + 4)
#define IFI_CANFD_FILTER_IDENT_IDE		BIT(29)
#define IFI_CANFD_FILTER_IDENT_CANFD		BIT(30)
#define IFI_CANFD_FILTER_IDENT_VALID		((u32)BIT(31))

/* IFI CANFD private data structure */
struct ifi_canfd_priv {
	struct can_priv		can;	/* must be the first member */
	struct napi_struct	napi;
	struct net_device	*ndev;
	void __iomem		*base;
};

static void ifi_canfd_irq_enable(struct net_device *ndev, bool enable)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	u32 enirq = 0;

	if (enable) {
		enirq = IFI_CANFD_IRQMASK_TXFIFO_EMPTY |
			IFI_CANFD_IRQMASK_RXFIFO_NEMPTY;
		if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
			enirq |= IFI_CANFD_INTERRUPT_ERROR_COUNTER;
	}

	writel(IFI_CANFD_IRQMASK_SET_ERR |
	       IFI_CANFD_IRQMASK_SET_TS |
	       IFI_CANFD_IRQMASK_SET_TX |
	       IFI_CANFD_IRQMASK_SET_RX | enirq,
	       priv->base + IFI_CANFD_IRQMASK);
}

static void ifi_canfd_read_fifo(struct net_device *ndev)
{
	struct net_device_stats *stats = &ndev->stats;
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	struct canfd_frame *cf;
	struct sk_buff *skb;
	const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY |
				IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER;
	u32 rxdlc, rxid;
	u32 dlc, id;
	int i;

	rxdlc = readl(priv->base + IFI_CANFD_RXFIFO_DLC);
	if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL)
		skb = alloc_canfd_skb(ndev, &cf);
	else
		skb = alloc_can_skb(ndev, (struct can_frame **)&cf);

	if (!skb) {
		stats->rx_dropped++;
		return;
	}

	dlc = (rxdlc >> IFI_CANFD_RXFIFO_DLC_DLC_OFFSET) &
	      IFI_CANFD_RXFIFO_DLC_DLC_MASK;
	if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL)
		cf->len = can_dlc2len(dlc);
	else
		cf->len = get_can_dlc(dlc);

	rxid = readl(priv->base + IFI_CANFD_RXFIFO_ID);
	id = (rxid >> IFI_CANFD_RXFIFO_ID_ID_OFFSET);
	if (id & IFI_CANFD_RXFIFO_ID_IDE) {
		id &= IFI_CANFD_RXFIFO_ID_ID_XTD_MASK;
		/*
		 * In case the Extended ID frame is received, the standard
		 * and extended part of the ID are swapped in the register,
		 * so swap them back to obtain the correct ID.
		 */
		id = (id >> IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET) |
		     ((id & IFI_CANFD_RXFIFO_ID_ID_STD_MASK) <<
		       IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH);
		id |= CAN_EFF_FLAG;
	} else {
		id &= IFI_CANFD_RXFIFO_ID_ID_STD_MASK;
	}
	cf->can_id = id;

	if (rxdlc & IFI_CANFD_RXFIFO_DLC_ESI) {
		cf->flags |= CANFD_ESI;
		netdev_dbg(ndev, "ESI Error\n");
	}

	if (!(rxdlc & IFI_CANFD_RXFIFO_DLC_EDL) &&
	    (rxdlc & IFI_CANFD_RXFIFO_DLC_RTR)) {
		cf->can_id |= CAN_RTR_FLAG;
	} else {
		if (rxdlc & IFI_CANFD_RXFIFO_DLC_BRS)
			cf->flags |= CANFD_BRS;

		for (i = 0; i < cf->len; i += 4) {
			*(u32 *)(cf->data + i) =
				readl(priv->base + IFI_CANFD_RXFIFO_DATA + i);
		}
	}

	/* Remove the packet from FIFO */
	writel(IFI_CANFD_RXSTCMD_REMOVE_MSG, priv->base + IFI_CANFD_RXSTCMD);
	writel(rx_irq_mask, priv->base + IFI_CANFD_INTERRUPT);

	stats->rx_packets++;
	stats->rx_bytes += cf->len;

	netif_receive_skb(skb);
}

static int ifi_canfd_do_rx_poll(struct net_device *ndev, int quota)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	u32 pkts = 0;
	u32 rxst;

	rxst = readl(priv->base + IFI_CANFD_RXSTCMD);
	if (rxst & IFI_CANFD_RXSTCMD_EMPTY) {
		netdev_dbg(ndev, "No messages in RX FIFO\n");
		return 0;
	}

	for (;;) {
		if (rxst & IFI_CANFD_RXSTCMD_EMPTY)
			break;
		if (quota <= 0)
			break;

		ifi_canfd_read_fifo(ndev);
		quota--;
		pkts++;
		rxst = readl(priv->base + IFI_CANFD_RXSTCMD);
	}

	if (pkts)
		can_led_event(ndev, CAN_LED_EVENT_RX);

	return pkts;
}

static int ifi_canfd_handle_lost_msg(struct net_device *ndev)
{
	struct net_device_stats *stats = &ndev->stats;
	struct sk_buff *skb;
	struct can_frame *frame;

	netdev_err(ndev, "RX FIFO overflow, message(s) lost.\n");

	stats->rx_errors++;
	stats->rx_over_errors++;

	skb = alloc_can_err_skb(ndev, &frame);
	if (unlikely(!skb))
		return 0;

	frame->can_id |= CAN_ERR_CRTL;
	frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;

	netif_receive_skb(skb);

	return 1;
}

static int ifi_canfd_handle_lec_err(struct net_device *ndev, const u32 errctr)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	struct net_device_stats *stats = &ndev->stats;
	struct can_frame *cf;
	struct sk_buff *skb;
	const u32 errmask = IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST |
			    IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST |
			    IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST |
			    IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST |
			    IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST |
			    IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST |
			    IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST;

	if (!(errctr & errmask))	/* No error happened. */
		return 0;

	priv->can.can_stats.bus_error++;
	stats->rx_errors++;

	/* Propagate the error condition to the CAN stack. */
	skb = alloc_can_err_skb(ndev, &cf);
	if (unlikely(!skb))
		return 0;

	/* Read the error counter register and check for new errors. */
	cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;

	if (errctr & IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST)
		cf->data[2] |= CAN_ERR_PROT_OVERLOAD;

	if (errctr & IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST)
		cf->data[3] = CAN_ERR_PROT_LOC_ACK;

	if (errctr & IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST)
		cf->data[2] |= CAN_ERR_PROT_BIT0;

	if (errctr & IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST)
		cf->data[2] |= CAN_ERR_PROT_BIT1;

	if (errctr & IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST)
		cf->data[2] |= CAN_ERR_PROT_STUFF;

	if (errctr & IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST)
		cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;

	if (errctr & IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST)
		cf->data[2] |= CAN_ERR_PROT_FORM;

	/* Reset the error counter, ack the IRQ and re-enable the counter. */
	writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
	writel(IFI_CANFD_INTERRUPT_ERROR_COUNTER,
	       priv->base + IFI_CANFD_INTERRUPT);
	writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);

	stats->rx_packets++;
	stats->rx_bytes += cf->can_dlc;
	netif_receive_skb(skb);

	return 1;
}

static int ifi_canfd_get_berr_counter(const struct net_device *ndev,
				      struct can_berr_counter *bec)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	u32 err;

	err = readl(priv->base + IFI_CANFD_ERROR);
	bec->rxerr = (err >> IFI_CANFD_ERROR_RX_OFFSET) &
		     IFI_CANFD_ERROR_RX_MASK;
	bec->txerr = (err >> IFI_CANFD_ERROR_TX_OFFSET) &
		     IFI_CANFD_ERROR_TX_MASK;

	return 0;
}

static int ifi_canfd_handle_state_change(struct net_device *ndev,
					 enum can_state new_state)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	struct net_device_stats *stats = &ndev->stats;
	struct can_frame *cf;
	struct sk_buff *skb;
	struct can_berr_counter bec;

	switch (new_state) {
	case CAN_STATE_ERROR_ACTIVE:
		/* error warning state */
		priv->can.can_stats.error_warning++;
		priv->can.state = CAN_STATE_ERROR_WARNING;
		break;
	case CAN_STATE_ERROR_PASSIVE:
		/* error passive state */
		priv->can.can_stats.error_passive++;
		priv->can.state = CAN_STATE_ERROR_PASSIVE;
		break;
	case CAN_STATE_BUS_OFF:
		/* bus-off state */
		priv->can.state = CAN_STATE_BUS_OFF;
		ifi_canfd_irq_enable(ndev, 0);
		priv->can.can_stats.bus_off++;
		can_bus_off(ndev);
		break;
	default:
		break;
	}

	/* propagate the error condition to the CAN stack */
	skb = alloc_can_err_skb(ndev, &cf);
	if (unlikely(!skb))
		return 0;

	ifi_canfd_get_berr_counter(ndev, &bec);

	switch (new_state) {
	case CAN_STATE_ERROR_ACTIVE:
		/* error warning state */
		cf->can_id |= CAN_ERR_CRTL;
		cf->data[1] = (bec.txerr > bec.rxerr) ?
			CAN_ERR_CRTL_TX_WARNING :
			CAN_ERR_CRTL_RX_WARNING;
		cf->data[6] = bec.txerr;
		cf->data[7] = bec.rxerr;
		break;
	case CAN_STATE_ERROR_PASSIVE:
		/* error passive state */
		cf->can_id |= CAN_ERR_CRTL;
		cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
		if (bec.txerr > 127)
			cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
		cf->data[6] = bec.txerr;
		cf->data[7] = bec.rxerr;
		break;
	case CAN_STATE_BUS_OFF:
		/* bus-off state */
		cf->can_id |= CAN_ERR_BUSOFF;
		break;
	default:
		break;
	}

	stats->rx_packets++;
	stats->rx_bytes += cf->can_dlc;
	netif_receive_skb(skb);

	return 1;
}

static int ifi_canfd_handle_state_errors(struct net_device *ndev, u32 stcmd)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	int work_done = 0;
	u32 isr;

	/*
	 * The ErrWarn condition is a little special, since the bit is
	 * located in the INTERRUPT register instead of STCMD register.
	 */
	isr = readl(priv->base + IFI_CANFD_INTERRUPT);
	if ((isr & IFI_CANFD_INTERRUPT_ERROR_WARNING) &&
	    (priv->can.state != CAN_STATE_ERROR_WARNING)) {
		/* Clear the interrupt */
		writel(IFI_CANFD_INTERRUPT_ERROR_WARNING,
		       priv->base + IFI_CANFD_INTERRUPT);
		netdev_dbg(ndev, "Error, entered warning state\n");
		work_done += ifi_canfd_handle_state_change(ndev,
						CAN_STATE_ERROR_WARNING);
	}

	if ((stcmd & IFI_CANFD_STCMD_ERROR_PASSIVE) &&
	    (priv->can.state != CAN_STATE_ERROR_PASSIVE)) {
		netdev_dbg(ndev, "Error, entered passive state\n");
		work_done += ifi_canfd_handle_state_change(ndev,
						CAN_STATE_ERROR_PASSIVE);
	}

	if ((stcmd & IFI_CANFD_STCMD_BUSOFF) &&
	    (priv->can.state != CAN_STATE_BUS_OFF)) {
		netdev_dbg(ndev, "Error, entered bus-off state\n");
		work_done += ifi_canfd_handle_state_change(ndev,
						CAN_STATE_BUS_OFF);
	}

	return work_done;
}

static int ifi_canfd_poll(struct napi_struct *napi, int quota)
{
	struct net_device *ndev = napi->dev;
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	const u32 stcmd_state_mask = IFI_CANFD_STCMD_ERROR_PASSIVE |
				     IFI_CANFD_STCMD_BUSOFF;
	int work_done = 0;

	u32 stcmd = readl(priv->base + IFI_CANFD_STCMD);
	u32 rxstcmd = readl(priv->base + IFI_CANFD_RXSTCMD);
	u32 errctr = readl(priv->base + IFI_CANFD_ERROR_CTR);

	/* Handle bus state changes */
	if ((stcmd & stcmd_state_mask) ||
	    ((stcmd & IFI_CANFD_STCMD_ERROR_ACTIVE) == 0))
		work_done += ifi_canfd_handle_state_errors(ndev, stcmd);

	/* Handle lost messages on RX */
	if (rxstcmd & IFI_CANFD_RXSTCMD_OVERFLOW)
		work_done += ifi_canfd_handle_lost_msg(ndev);

	/* Handle lec errors on the bus */
	if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
		work_done += ifi_canfd_handle_lec_err(ndev, errctr);

	/* Handle normal messages on RX */
	if (!(rxstcmd & IFI_CANFD_RXSTCMD_EMPTY))
		work_done += ifi_canfd_do_rx_poll(ndev, quota - work_done);

	if (work_done < quota) {
		napi_complete(napi);
		ifi_canfd_irq_enable(ndev, 1);
	}

	return work_done;
}

static irqreturn_t ifi_canfd_isr(int irq, void *dev_id)
{
	struct net_device *ndev = (struct net_device *)dev_id;
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	struct net_device_stats *stats = &ndev->stats;
	const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY |
				IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER |
				IFI_CANFD_INTERRUPT_ERROR_WARNING |
				IFI_CANFD_INTERRUPT_ERROR_COUNTER;
	const u32 tx_irq_mask = IFI_CANFD_INTERRUPT_TXFIFO_EMPTY |
				IFI_CANFD_INTERRUPT_TXFIFO_REMOVE;
	const u32 clr_irq_mask = ~((u32)(IFI_CANFD_INTERRUPT_SET_IRQ |
					 IFI_CANFD_INTERRUPT_ERROR_WARNING));
	u32 isr;

	isr = readl(priv->base + IFI_CANFD_INTERRUPT);

	/* No interrupt */
	if (isr == 0)
		return IRQ_NONE;

	/* Clear all pending interrupts but ErrWarn */
	writel(clr_irq_mask, priv->base + IFI_CANFD_INTERRUPT);

	/* RX IRQ or bus warning, start NAPI */
	if (isr & rx_irq_mask) {
		ifi_canfd_irq_enable(ndev, 0);
		napi_schedule(&priv->napi);
	}

	/* TX IRQ */
	if (isr & IFI_CANFD_INTERRUPT_TXFIFO_REMOVE) {
		stats->tx_bytes += can_get_echo_skb(ndev, 0);
		stats->tx_packets++;
		can_led_event(ndev, CAN_LED_EVENT_TX);
	}

	if (isr & tx_irq_mask)
		netif_wake_queue(ndev);

	return IRQ_HANDLED;
}

static const struct can_bittiming_const ifi_canfd_bittiming_const = {
	.name		= KBUILD_MODNAME,
	.tseg1_min	= 1,	/* Time segment 1 = prop_seg + phase_seg1 */
	.tseg1_max	= 256,
	.tseg2_min	= 2,	/* Time segment 2 = phase_seg2 */
	.tseg2_max	= 256,
	.sjw_max	= 128,
	.brp_min	= 2,
	.brp_max	= 512,
	.brp_inc	= 1,
};

static void ifi_canfd_set_bittiming(struct net_device *ndev)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	const struct can_bittiming *bt = &priv->can.bittiming;
	const struct can_bittiming *dbt = &priv->can.data_bittiming;
	u16 brp, sjw, tseg1, tseg2, tdc;

	/* Configure bit timing */
	brp = bt->brp - 2;
	sjw = bt->sjw - 1;
	tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
	tseg2 = bt->phase_seg2 - 2;
	writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
	       (tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
	       (brp << IFI_CANFD_TIME_PRESCALE_OFF) |
	       (sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
	       priv->base + IFI_CANFD_TIME);

	/* Configure data bit timing */
	brp = dbt->brp - 2;
	sjw = dbt->sjw - 1;
	tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1;
	tseg2 = dbt->phase_seg2 - 2;
	writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
	       (tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
	       (brp << IFI_CANFD_TIME_PRESCALE_OFF) |
	       (sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
	       priv->base + IFI_CANFD_FTIME);

	/* Configure transmitter delay */
	tdc = (dbt->brp * (dbt->phase_seg1 + 1)) & IFI_CANFD_TDELAY_MASK;
	writel(IFI_CANFD_TDELAY_EN | IFI_CANFD_TDELAY_ABS | tdc,
	       priv->base + IFI_CANFD_TDELAY);
}

static void ifi_canfd_set_filter(struct net_device *ndev, const u32 id,
				 const u32 mask, const u32 ident)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);

	writel(mask, priv->base + IFI_CANFD_FILTER_MASK(id));
	writel(ident, priv->base + IFI_CANFD_FILTER_IDENT(id));
}

static void ifi_canfd_set_filters(struct net_device *ndev)
{
	/* Receive all CAN frames (standard ID) */
	ifi_canfd_set_filter(ndev, 0,
			     IFI_CANFD_FILTER_MASK_VALID |
			     IFI_CANFD_FILTER_MASK_EXT,
			     IFI_CANFD_FILTER_IDENT_VALID);

	/* Receive all CAN frames (extended ID) */
	ifi_canfd_set_filter(ndev, 1,
			     IFI_CANFD_FILTER_MASK_VALID |
			     IFI_CANFD_FILTER_MASK_EXT,
			     IFI_CANFD_FILTER_IDENT_VALID |
			     IFI_CANFD_FILTER_IDENT_IDE);

	/* Receive all CANFD frames */
	ifi_canfd_set_filter(ndev, 2,
			     IFI_CANFD_FILTER_MASK_VALID |
			     IFI_CANFD_FILTER_MASK_EDL |
			     IFI_CANFD_FILTER_MASK_EXT,
			     IFI_CANFD_FILTER_IDENT_VALID |
			     IFI_CANFD_FILTER_IDENT_CANFD |
			     IFI_CANFD_FILTER_IDENT_IDE);
}

static void ifi_canfd_start(struct net_device *ndev)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	u32 stcmd;

	/* Reset the IP */
	writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD);
	writel(IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING,
	       priv->base + IFI_CANFD_STCMD);

	ifi_canfd_set_bittiming(ndev);
	ifi_canfd_set_filters(ndev);

	/* Reset FIFOs */
	writel(IFI_CANFD_RXSTCMD_RESET, priv->base + IFI_CANFD_RXSTCMD);
	writel(0, priv->base + IFI_CANFD_RXSTCMD);
	writel(IFI_CANFD_TXSTCMD_RESET, priv->base + IFI_CANFD_TXSTCMD);
	writel(0, priv->base + IFI_CANFD_TXSTCMD);

	/* Repeat transmission until successful */
	writel(0, priv->base + IFI_CANFD_REPEAT);
	writel(0, priv->base + IFI_CANFD_SUSPEND);

	/* Clear all pending interrupts */
	writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ),
	       priv->base + IFI_CANFD_INTERRUPT);

	stcmd = IFI_CANFD_STCMD_ENABLE | IFI_CANFD_STCMD_NORMAL_MODE |
		IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING;

	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
		stcmd |= IFI_CANFD_STCMD_BUSMONITOR;

	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
		stcmd |= IFI_CANFD_STCMD_LOOPBACK;

	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) &&
	    !(priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO))
		stcmd |= IFI_CANFD_STCMD_ENABLE_ISO;

	if (!(priv->can.ctrlmode & CAN_CTRLMODE_FD))
		stcmd |= IFI_CANFD_STCMD_DISABLE_CANFD;

	priv->can.state = CAN_STATE_ERROR_ACTIVE;

	ifi_canfd_irq_enable(ndev, 1);

	/* Unlock, reset and enable the error counter. */
	writel(IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC,
	       priv->base + IFI_CANFD_ERROR_CTR);
	writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
	writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);

	/* Enable controller */
	writel(stcmd, priv->base + IFI_CANFD_STCMD);
}

static void ifi_canfd_stop(struct net_device *ndev)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);

	/* Reset and disable the error counter. */
	writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
	writel(0, priv->base + IFI_CANFD_ERROR_CTR);

	/* Reset the IP */
	writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD);

	/* Mask all interrupts */
	writel(~0, priv->base + IFI_CANFD_IRQMASK);

	/* Clear all pending interrupts */
	writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ),
	       priv->base + IFI_CANFD_INTERRUPT);

	/* Set the state as STOPPED */
	priv->can.state = CAN_STATE_STOPPED;
}

static int ifi_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
{
	switch (mode) {
	case CAN_MODE_START:
		ifi_canfd_start(ndev);
		netif_wake_queue(ndev);
		break;
	default:
		return -EOPNOTSUPP;
	}

	return 0;
}

static int ifi_canfd_open(struct net_device *ndev)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	int ret;

	ret = open_candev(ndev);
	if (ret) {
		netdev_err(ndev, "Failed to open CAN device\n");
		return ret;
	}

	/* Register interrupt handler */
	ret = request_irq(ndev->irq, ifi_canfd_isr, IRQF_SHARED,
			  ndev->name, ndev);
	if (ret < 0) {
		netdev_err(ndev, "Failed to request interrupt\n");
		goto err_irq;
	}

	ifi_canfd_start(ndev);

	can_led_event(ndev, CAN_LED_EVENT_OPEN);
	napi_enable(&priv->napi);
	netif_start_queue(ndev);

	return 0;
err_irq:
	close_candev(ndev);
	return ret;
}

static int ifi_canfd_close(struct net_device *ndev)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);

	netif_stop_queue(ndev);
	napi_disable(&priv->napi);

	ifi_canfd_stop(ndev);

	free_irq(ndev->irq, ndev);

	close_candev(ndev);

	can_led_event(ndev, CAN_LED_EVENT_STOP);

	return 0;
}

static netdev_tx_t ifi_canfd_start_xmit(struct sk_buff *skb,
					struct net_device *ndev)
{
	struct ifi_canfd_priv *priv = netdev_priv(ndev);
	struct canfd_frame *cf = (struct canfd_frame *)skb->data;
	u32 txst, txid, txdlc;
	int i;

	if (can_dropped_invalid_skb(ndev, skb))
		return NETDEV_TX_OK;

	/* Check if the TX buffer is full */
	txst = readl(priv->base + IFI_CANFD_TXSTCMD);
	if (txst & IFI_CANFD_TXSTCMD_FULL) {
		netif_stop_queue(ndev);
		netdev_err(ndev, "BUG! TX FIFO full when queue awake!\n");
		return NETDEV_TX_BUSY;
	}

	netif_stop_queue(ndev);

	if (cf->can_id & CAN_EFF_FLAG) {
		txid = cf->can_id & CAN_EFF_MASK;
		/*
		 * In case the Extended ID frame is transmitted, the
		 * standard and extended part of the ID are swapped
		 * in the register, so swap them back to send the
		 * correct ID.
		 */
		txid = (txid >> IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH) |
		       ((txid & IFI_CANFD_TXFIFO_ID_ID_XTD_MASK) <<
		         IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET);
		txid |= IFI_CANFD_TXFIFO_ID_IDE;
	} else {
		txid = cf->can_id & CAN_SFF_MASK;
	}

	txdlc = can_len2dlc(cf->len);
	if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) && can_is_canfd_skb(skb)) {
		txdlc |= IFI_CANFD_TXFIFO_DLC_EDL;
		if (cf->flags & CANFD_BRS)
			txdlc |= IFI_CANFD_TXFIFO_DLC_BRS;
	}

	if (cf->can_id & CAN_RTR_FLAG)
		txdlc |= IFI_CANFD_TXFIFO_DLC_RTR;

	/* message ram configuration */
	writel(txid, priv->base + IFI_CANFD_TXFIFO_ID);
	writel(txdlc, priv->base + IFI_CANFD_TXFIFO_DLC);

	for (i = 0; i < cf->len; i += 4) {
		writel(*(u32 *)(cf->data + i),
		       priv->base + IFI_CANFD_TXFIFO_DATA + i);
	}

	writel(0, priv->base + IFI_CANFD_TXFIFO_REPEATCOUNT);
	writel(0, priv->base + IFI_CANFD_TXFIFO_SUSPEND_US);

	can_put_echo_skb(skb, ndev, 0);

	/* Start the transmission */
	writel(IFI_CANFD_TXSTCMD_ADD_MSG, priv->base + IFI_CANFD_TXSTCMD);

	return NETDEV_TX_OK;
}

static const struct net_device_ops ifi_canfd_netdev_ops = {
	.ndo_open	= ifi_canfd_open,
	.ndo_stop	= ifi_canfd_close,
	.ndo_start_xmit	= ifi_canfd_start_xmit,
	.ndo_change_mtu	= can_change_mtu,
};

static int ifi_canfd_plat_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct net_device *ndev;
	struct ifi_canfd_priv *priv;
	struct resource *res;
	void __iomem *addr;
	int irq, ret;
	u32 id;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	addr = devm_ioremap_resource(dev, res);
	irq = platform_get_irq(pdev, 0);
	if (IS_ERR(addr) || irq < 0)
		return -EINVAL;

	id = readl(addr + IFI_CANFD_IP_ID);
	if (id != IFI_CANFD_IP_ID_VALUE) {
		dev_err(dev, "This block is not IFI CANFD, id=%08x\n", id);
		return -EINVAL;
	}

	ndev = alloc_candev(sizeof(*priv), 1);
	if (!ndev)
		return -ENOMEM;

	ndev->irq = irq;
	ndev->flags |= IFF_ECHO;	/* we support local echo */
	ndev->netdev_ops = &ifi_canfd_netdev_ops;

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

	netif_napi_add(ndev, &priv->napi, ifi_canfd_poll, 64);

	priv->can.state = CAN_STATE_STOPPED;

	priv->can.clock.freq = readl(addr + IFI_CANFD_CANCLOCK);

	priv->can.bittiming_const	= &ifi_canfd_bittiming_const;
	priv->can.data_bittiming_const	= &ifi_canfd_bittiming_const;
	priv->can.do_set_mode		= ifi_canfd_set_mode;
	priv->can.do_get_berr_counter	= ifi_canfd_get_berr_counter;

	/* IFI CANFD can do both Bosch FD and ISO FD */
	priv->can.ctrlmode = CAN_CTRLMODE_FD;

	/* IFI CANFD can do both Bosch FD and ISO FD */
	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
				       CAN_CTRLMODE_LISTENONLY |
				       CAN_CTRLMODE_FD |
				       CAN_CTRLMODE_FD_NON_ISO |
				       CAN_CTRLMODE_BERR_REPORTING;

	platform_set_drvdata(pdev, ndev);
	SET_NETDEV_DEV(ndev, dev);

	ret = register_candev(ndev);
	if (ret) {
		dev_err(dev, "Failed to register (ret=%d)\n", ret);
		goto err_reg;
	}

	devm_can_led_init(ndev);

	dev_info(dev, "Driver registered: regs=%p, irq=%d, clock=%d\n",
		 priv->base, ndev->irq, priv->can.clock.freq);

	return 0;

err_reg:
	free_candev(ndev);
	return ret;
}

static int ifi_canfd_plat_remove(struct platform_device *pdev)
{
	struct net_device *ndev = platform_get_drvdata(pdev);

	unregister_candev(ndev);
	platform_set_drvdata(pdev, NULL);
	free_candev(ndev);

	return 0;
}

static const struct of_device_id ifi_canfd_of_table[] = {
	{ .compatible = "ifi,canfd-1.0", .data = NULL },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ifi_canfd_of_table);

static struct platform_driver ifi_canfd_plat_driver = {
	.driver = {
		.name		= KBUILD_MODNAME,
		.of_match_table	= ifi_canfd_of_table,
	},
	.probe	= ifi_canfd_plat_probe,
	.remove	= ifi_canfd_plat_remove,
};

module_platform_driver(ifi_canfd_plat_driver);

MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CAN bus driver for IFI CANFD controller");