summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/net/ethernet/hisilicon/hix5hd2_gmac.c
blob: e51892d518ff3ccca8aaed43838d7343b4844dc3 (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
/* Copyright (c) 2014 Linaro Ltd.
 * Copyright (c) 2014 Hisilicon Limited.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/etherdevice.h>
#include <linux/platform_device.h>
#include <linux/of_net.h>
#include <linux/of_mdio.h>
#include <linux/clk.h>
#include <linux/circ_buf.h>

#define STATION_ADDR_LOW		0x0000
#define STATION_ADDR_HIGH		0x0004
#define MAC_DUPLEX_HALF_CTRL		0x0008
#define MAX_FRM_SIZE			0x003c
#define PORT_MODE			0x0040
#define PORT_EN				0x0044
#define BITS_TX_EN			BIT(2)
#define BITS_RX_EN			BIT(1)
#define REC_FILT_CONTROL		0x0064
#define BIT_CRC_ERR_PASS		BIT(5)
#define BIT_PAUSE_FRM_PASS		BIT(4)
#define BIT_VLAN_DROP_EN		BIT(3)
#define BIT_BC_DROP_EN			BIT(2)
#define BIT_MC_MATCH_EN			BIT(1)
#define BIT_UC_MATCH_EN			BIT(0)
#define PORT_MC_ADDR_LOW		0x0068
#define PORT_MC_ADDR_HIGH		0x006C
#define CF_CRC_STRIP			0x01b0
#define MODE_CHANGE_EN			0x01b4
#define BIT_MODE_CHANGE_EN		BIT(0)
#define COL_SLOT_TIME			0x01c0
#define RECV_CONTROL			0x01e0
#define BIT_STRIP_PAD_EN		BIT(3)
#define BIT_RUNT_PKT_EN			BIT(4)
#define CONTROL_WORD			0x0214
#define MDIO_SINGLE_CMD			0x03c0
#define MDIO_SINGLE_DATA		0x03c4
#define MDIO_CTRL			0x03cc
#define MDIO_RDATA_STATUS		0x03d0

#define MDIO_START			BIT(20)
#define MDIO_R_VALID			BIT(0)
#define MDIO_READ			(BIT(17) | MDIO_START)
#define MDIO_WRITE			(BIT(16) | MDIO_START)

#define RX_FQ_START_ADDR		0x0500
#define RX_FQ_DEPTH			0x0504
#define RX_FQ_WR_ADDR			0x0508
#define RX_FQ_RD_ADDR			0x050c
#define RX_FQ_VLDDESC_CNT		0x0510
#define RX_FQ_ALEMPTY_TH		0x0514
#define RX_FQ_REG_EN			0x0518
#define BITS_RX_FQ_START_ADDR_EN	BIT(2)
#define BITS_RX_FQ_DEPTH_EN		BIT(1)
#define BITS_RX_FQ_RD_ADDR_EN		BIT(0)
#define RX_FQ_ALFULL_TH			0x051c
#define RX_BQ_START_ADDR		0x0520
#define RX_BQ_DEPTH			0x0524
#define RX_BQ_WR_ADDR			0x0528
#define RX_BQ_RD_ADDR			0x052c
#define RX_BQ_FREE_DESC_CNT		0x0530
#define RX_BQ_ALEMPTY_TH		0x0534
#define RX_BQ_REG_EN			0x0538
#define BITS_RX_BQ_START_ADDR_EN	BIT(2)
#define BITS_RX_BQ_DEPTH_EN		BIT(1)
#define BITS_RX_BQ_WR_ADDR_EN		BIT(0)
#define RX_BQ_ALFULL_TH			0x053c
#define TX_BQ_START_ADDR		0x0580
#define TX_BQ_DEPTH			0x0584
#define TX_BQ_WR_ADDR			0x0588
#define TX_BQ_RD_ADDR			0x058c
#define TX_BQ_VLDDESC_CNT		0x0590
#define TX_BQ_ALEMPTY_TH		0x0594
#define TX_BQ_REG_EN			0x0598
#define BITS_TX_BQ_START_ADDR_EN	BIT(2)
#define BITS_TX_BQ_DEPTH_EN		BIT(1)
#define BITS_TX_BQ_RD_ADDR_EN		BIT(0)
#define TX_BQ_ALFULL_TH			0x059c
#define TX_RQ_START_ADDR		0x05a0
#define TX_RQ_DEPTH			0x05a4
#define TX_RQ_WR_ADDR			0x05a8
#define TX_RQ_RD_ADDR			0x05ac
#define TX_RQ_FREE_DESC_CNT		0x05b0
#define TX_RQ_ALEMPTY_TH		0x05b4
#define TX_RQ_REG_EN			0x05b8
#define BITS_TX_RQ_START_ADDR_EN	BIT(2)
#define BITS_TX_RQ_DEPTH_EN		BIT(1)
#define BITS_TX_RQ_WR_ADDR_EN		BIT(0)
#define TX_RQ_ALFULL_TH			0x05bc
#define RAW_PMU_INT			0x05c0
#define ENA_PMU_INT			0x05c4
#define STATUS_PMU_INT			0x05c8
#define MAC_FIFO_ERR_IN			BIT(30)
#define TX_RQ_IN_TIMEOUT_INT		BIT(29)
#define RX_BQ_IN_TIMEOUT_INT		BIT(28)
#define TXOUTCFF_FULL_INT		BIT(27)
#define TXOUTCFF_EMPTY_INT		BIT(26)
#define TXCFF_FULL_INT			BIT(25)
#define TXCFF_EMPTY_INT			BIT(24)
#define RXOUTCFF_FULL_INT		BIT(23)
#define RXOUTCFF_EMPTY_INT		BIT(22)
#define RXCFF_FULL_INT			BIT(21)
#define RXCFF_EMPTY_INT			BIT(20)
#define TX_RQ_IN_INT			BIT(19)
#define TX_BQ_OUT_INT			BIT(18)
#define RX_BQ_IN_INT			BIT(17)
#define RX_FQ_OUT_INT			BIT(16)
#define TX_RQ_EMPTY_INT			BIT(15)
#define TX_RQ_FULL_INT			BIT(14)
#define TX_RQ_ALEMPTY_INT		BIT(13)
#define TX_RQ_ALFULL_INT		BIT(12)
#define TX_BQ_EMPTY_INT			BIT(11)
#define TX_BQ_FULL_INT			BIT(10)
#define TX_BQ_ALEMPTY_INT		BIT(9)
#define TX_BQ_ALFULL_INT		BIT(8)
#define RX_BQ_EMPTY_INT			BIT(7)
#define RX_BQ_FULL_INT			BIT(6)
#define RX_BQ_ALEMPTY_INT		BIT(5)
#define RX_BQ_ALFULL_INT		BIT(4)
#define RX_FQ_EMPTY_INT			BIT(3)
#define RX_FQ_FULL_INT			BIT(2)
#define RX_FQ_ALEMPTY_INT		BIT(1)
#define RX_FQ_ALFULL_INT		BIT(0)

#define DEF_INT_MASK			(RX_BQ_IN_INT | RX_BQ_IN_TIMEOUT_INT | \
					TX_RQ_IN_INT | TX_RQ_IN_TIMEOUT_INT)

#define DESC_WR_RD_ENA			0x05cc
#define IN_QUEUE_TH			0x05d8
#define OUT_QUEUE_TH			0x05dc
#define QUEUE_TX_BQ_SHIFT		16
#define RX_BQ_IN_TIMEOUT_TH		0x05e0
#define TX_RQ_IN_TIMEOUT_TH		0x05e4
#define STOP_CMD			0x05e8
#define BITS_TX_STOP			BIT(1)
#define BITS_RX_STOP			BIT(0)
#define FLUSH_CMD			0x05eC
#define BITS_TX_FLUSH_CMD		BIT(5)
#define BITS_RX_FLUSH_CMD		BIT(4)
#define BITS_TX_FLUSH_FLAG_DOWN		BIT(3)
#define BITS_TX_FLUSH_FLAG_UP		BIT(2)
#define BITS_RX_FLUSH_FLAG_DOWN		BIT(1)
#define BITS_RX_FLUSH_FLAG_UP		BIT(0)
#define RX_CFF_NUM_REG			0x05f0
#define PMU_FSM_REG			0x05f8
#define RX_FIFO_PKT_IN_NUM		0x05fc
#define RX_FIFO_PKT_OUT_NUM		0x0600

#define RGMII_SPEED_1000		0x2c
#define RGMII_SPEED_100			0x2f
#define RGMII_SPEED_10			0x2d
#define MII_SPEED_100			0x0f
#define MII_SPEED_10			0x0d
#define GMAC_SPEED_1000			0x05
#define GMAC_SPEED_100			0x01
#define GMAC_SPEED_10			0x00
#define GMAC_FULL_DUPLEX		BIT(4)

#define RX_BQ_INT_THRESHOLD		0x01
#define TX_RQ_INT_THRESHOLD		0x01
#define RX_BQ_IN_TIMEOUT		0x10000
#define TX_RQ_IN_TIMEOUT		0x50000

#define MAC_MAX_FRAME_SIZE		1600
#define DESC_SIZE			32
#define RX_DESC_NUM			1024
#define TX_DESC_NUM			1024

#define DESC_VLD_FREE			0
#define DESC_VLD_BUSY			0x80000000
#define DESC_FL_MID			0
#define DESC_FL_LAST			0x20000000
#define DESC_FL_FIRST			0x40000000
#define DESC_FL_FULL			0x60000000
#define DESC_DATA_LEN_OFF		16
#define DESC_BUFF_LEN_OFF		0
#define DESC_DATA_MASK			0x7ff

/* DMA descriptor ring helpers */
#define dma_ring_incr(n, s)		(((n) + 1) & ((s) - 1))
#define dma_cnt(n)			((n) >> 5)
#define dma_byte(n)			((n) << 5)

struct hix5hd2_desc {
	__le32 buff_addr;
	__le32 cmd;
} __aligned(32);

struct hix5hd2_desc_sw {
	struct hix5hd2_desc *desc;
	dma_addr_t	phys_addr;
	unsigned int	count;
	unsigned int	size;
};

#define QUEUE_NUMS	4
struct hix5hd2_priv {
	struct hix5hd2_desc_sw pool[QUEUE_NUMS];
#define rx_fq		pool[0]
#define rx_bq		pool[1]
#define tx_bq		pool[2]
#define tx_rq		pool[3]

	void __iomem *base;
	void __iomem *ctrl_base;

	struct sk_buff *tx_skb[TX_DESC_NUM];
	struct sk_buff *rx_skb[RX_DESC_NUM];

	struct device *dev;
	struct net_device *netdev;

	struct phy_device *phy;
	struct device_node *phy_node;
	phy_interface_t	phy_mode;

	unsigned int speed;
	unsigned int duplex;

	struct clk *clk;
	struct mii_bus *bus;
	struct napi_struct napi;
	struct work_struct tx_timeout_task;
};

static void hix5hd2_config_port(struct net_device *dev, u32 speed, u32 duplex)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);
	u32 val;

	priv->speed = speed;
	priv->duplex = duplex;

	switch (priv->phy_mode) {
	case PHY_INTERFACE_MODE_RGMII:
		if (speed == SPEED_1000)
			val = RGMII_SPEED_1000;
		else if (speed == SPEED_100)
			val = RGMII_SPEED_100;
		else
			val = RGMII_SPEED_10;
		break;
	case PHY_INTERFACE_MODE_MII:
		if (speed == SPEED_100)
			val = MII_SPEED_100;
		else
			val = MII_SPEED_10;
		break;
	default:
		netdev_warn(dev, "not supported mode\n");
		val = MII_SPEED_10;
		break;
	}

	if (duplex)
		val |= GMAC_FULL_DUPLEX;
	writel_relaxed(val, priv->ctrl_base);

	writel_relaxed(BIT_MODE_CHANGE_EN, priv->base + MODE_CHANGE_EN);
	if (speed == SPEED_1000)
		val = GMAC_SPEED_1000;
	else if (speed == SPEED_100)
		val = GMAC_SPEED_100;
	else
		val = GMAC_SPEED_10;
	writel_relaxed(val, priv->base + PORT_MODE);
	writel_relaxed(0, priv->base + MODE_CHANGE_EN);
	writel_relaxed(duplex, priv->base + MAC_DUPLEX_HALF_CTRL);
}

static void hix5hd2_set_desc_depth(struct hix5hd2_priv *priv, int rx, int tx)
{
	writel_relaxed(BITS_RX_FQ_DEPTH_EN, priv->base + RX_FQ_REG_EN);
	writel_relaxed(rx << 3, priv->base + RX_FQ_DEPTH);
	writel_relaxed(0, priv->base + RX_FQ_REG_EN);

	writel_relaxed(BITS_RX_BQ_DEPTH_EN, priv->base + RX_BQ_REG_EN);
	writel_relaxed(rx << 3, priv->base + RX_BQ_DEPTH);
	writel_relaxed(0, priv->base + RX_BQ_REG_EN);

	writel_relaxed(BITS_TX_BQ_DEPTH_EN, priv->base + TX_BQ_REG_EN);
	writel_relaxed(tx << 3, priv->base + TX_BQ_DEPTH);
	writel_relaxed(0, priv->base + TX_BQ_REG_EN);

	writel_relaxed(BITS_TX_RQ_DEPTH_EN, priv->base + TX_RQ_REG_EN);
	writel_relaxed(tx << 3, priv->base + TX_RQ_DEPTH);
	writel_relaxed(0, priv->base + TX_RQ_REG_EN);
}

static void hix5hd2_set_rx_fq(struct hix5hd2_priv *priv, dma_addr_t phy_addr)
{
	writel_relaxed(BITS_RX_FQ_START_ADDR_EN, priv->base + RX_FQ_REG_EN);
	writel_relaxed(phy_addr, priv->base + RX_FQ_START_ADDR);
	writel_relaxed(0, priv->base + RX_FQ_REG_EN);
}

static void hix5hd2_set_rx_bq(struct hix5hd2_priv *priv, dma_addr_t phy_addr)
{
	writel_relaxed(BITS_RX_BQ_START_ADDR_EN, priv->base + RX_BQ_REG_EN);
	writel_relaxed(phy_addr, priv->base + RX_BQ_START_ADDR);
	writel_relaxed(0, priv->base + RX_BQ_REG_EN);
}

static void hix5hd2_set_tx_bq(struct hix5hd2_priv *priv, dma_addr_t phy_addr)
{
	writel_relaxed(BITS_TX_BQ_START_ADDR_EN, priv->base + TX_BQ_REG_EN);
	writel_relaxed(phy_addr, priv->base + TX_BQ_START_ADDR);
	writel_relaxed(0, priv->base + TX_BQ_REG_EN);
}

static void hix5hd2_set_tx_rq(struct hix5hd2_priv *priv, dma_addr_t phy_addr)
{
	writel_relaxed(BITS_TX_RQ_START_ADDR_EN, priv->base + TX_RQ_REG_EN);
	writel_relaxed(phy_addr, priv->base + TX_RQ_START_ADDR);
	writel_relaxed(0, priv->base + TX_RQ_REG_EN);
}

static void hix5hd2_set_desc_addr(struct hix5hd2_priv *priv)
{
	hix5hd2_set_rx_fq(priv, priv->rx_fq.phys_addr);
	hix5hd2_set_rx_bq(priv, priv->rx_bq.phys_addr);
	hix5hd2_set_tx_rq(priv, priv->tx_rq.phys_addr);
	hix5hd2_set_tx_bq(priv, priv->tx_bq.phys_addr);
}

static void hix5hd2_hw_init(struct hix5hd2_priv *priv)
{
	u32 val;

	/* disable and clear all interrupts */
	writel_relaxed(0, priv->base + ENA_PMU_INT);
	writel_relaxed(~0, priv->base + RAW_PMU_INT);

	writel_relaxed(BIT_CRC_ERR_PASS, priv->base + REC_FILT_CONTROL);
	writel_relaxed(MAC_MAX_FRAME_SIZE, priv->base + CONTROL_WORD);
	writel_relaxed(0, priv->base + COL_SLOT_TIME);

	val = RX_BQ_INT_THRESHOLD | TX_RQ_INT_THRESHOLD << QUEUE_TX_BQ_SHIFT;
	writel_relaxed(val, priv->base + IN_QUEUE_TH);

	writel_relaxed(RX_BQ_IN_TIMEOUT, priv->base + RX_BQ_IN_TIMEOUT_TH);
	writel_relaxed(TX_RQ_IN_TIMEOUT, priv->base + TX_RQ_IN_TIMEOUT_TH);

	hix5hd2_set_desc_depth(priv, RX_DESC_NUM, TX_DESC_NUM);
	hix5hd2_set_desc_addr(priv);
}

static void hix5hd2_irq_enable(struct hix5hd2_priv *priv)
{
	writel_relaxed(DEF_INT_MASK, priv->base + ENA_PMU_INT);
}

static void hix5hd2_irq_disable(struct hix5hd2_priv *priv)
{
	writel_relaxed(0, priv->base + ENA_PMU_INT);
}

static void hix5hd2_port_enable(struct hix5hd2_priv *priv)
{
	writel_relaxed(0xf, priv->base + DESC_WR_RD_ENA);
	writel_relaxed(BITS_RX_EN | BITS_TX_EN, priv->base + PORT_EN);
}

static void hix5hd2_port_disable(struct hix5hd2_priv *priv)
{
	writel_relaxed(~(u32)(BITS_RX_EN | BITS_TX_EN), priv->base + PORT_EN);
	writel_relaxed(0, priv->base + DESC_WR_RD_ENA);
}

static void hix5hd2_hw_set_mac_addr(struct net_device *dev)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);
	unsigned char *mac = dev->dev_addr;
	u32 val;

	val = mac[1] | (mac[0] << 8);
	writel_relaxed(val, priv->base + STATION_ADDR_HIGH);

	val = mac[5] | (mac[4] << 8) | (mac[3] << 16) | (mac[2] << 24);
	writel_relaxed(val, priv->base + STATION_ADDR_LOW);
}

static int hix5hd2_net_set_mac_address(struct net_device *dev, void *p)
{
	int ret;

	ret = eth_mac_addr(dev, p);
	if (!ret)
		hix5hd2_hw_set_mac_addr(dev);

	return ret;
}

static void hix5hd2_adjust_link(struct net_device *dev)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);
	struct phy_device *phy = priv->phy;

	if ((priv->speed != phy->speed) || (priv->duplex != phy->duplex)) {
		hix5hd2_config_port(dev, phy->speed, phy->duplex);
		phy_print_status(phy);
	}
}

static void hix5hd2_rx_refill(struct hix5hd2_priv *priv)
{
	struct hix5hd2_desc *desc;
	struct sk_buff *skb;
	u32 start, end, num, pos, i;
	u32 len = MAC_MAX_FRAME_SIZE;
	dma_addr_t addr;

	/* software write pointer */
	start = dma_cnt(readl_relaxed(priv->base + RX_FQ_WR_ADDR));
	/* logic read pointer */
	end = dma_cnt(readl_relaxed(priv->base + RX_FQ_RD_ADDR));
	num = CIRC_SPACE(start, end, RX_DESC_NUM);

	for (i = 0, pos = start; i < num; i++) {
		if (priv->rx_skb[pos]) {
			break;
		} else {
			skb = netdev_alloc_skb_ip_align(priv->netdev, len);
			if (unlikely(skb == NULL))
				break;
		}

		addr = dma_map_single(priv->dev, skb->data, len, DMA_FROM_DEVICE);
		if (dma_mapping_error(priv->dev, addr)) {
			dev_kfree_skb_any(skb);
			break;
		}

		desc = priv->rx_fq.desc + pos;
		desc->buff_addr = cpu_to_le32(addr);
		priv->rx_skb[pos] = skb;
		desc->cmd = cpu_to_le32(DESC_VLD_FREE |
					(len - 1) << DESC_BUFF_LEN_OFF);
		pos = dma_ring_incr(pos, RX_DESC_NUM);
	}

	/* ensure desc updated */
	wmb();

	if (pos != start)
		writel_relaxed(dma_byte(pos), priv->base + RX_FQ_WR_ADDR);
}

static int hix5hd2_rx(struct net_device *dev, int limit)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);
	struct sk_buff *skb;
	struct hix5hd2_desc *desc;
	dma_addr_t addr;
	u32 start, end, num, pos, i, len;

	/* software read pointer */
	start = dma_cnt(readl_relaxed(priv->base + RX_BQ_RD_ADDR));
	/* logic write pointer */
	end = dma_cnt(readl_relaxed(priv->base + RX_BQ_WR_ADDR));
	num = CIRC_CNT(end, start, RX_DESC_NUM);
	if (num > limit)
		num = limit;

	/* ensure get updated desc */
	rmb();
	for (i = 0, pos = start; i < num; i++) {
		skb = priv->rx_skb[pos];
		if (unlikely(!skb)) {
			netdev_err(dev, "inconsistent rx_skb\n");
			break;
		}
		priv->rx_skb[pos] = NULL;

		desc = priv->rx_bq.desc + pos;
		len = (le32_to_cpu(desc->cmd) >> DESC_DATA_LEN_OFF) &
		       DESC_DATA_MASK;
		addr = le32_to_cpu(desc->buff_addr);
		dma_unmap_single(priv->dev, addr, MAC_MAX_FRAME_SIZE,
				 DMA_FROM_DEVICE);

		skb_put(skb, len);
		if (skb->len > MAC_MAX_FRAME_SIZE) {
			netdev_err(dev, "rcv len err, len = %d\n", skb->len);
			dev->stats.rx_errors++;
			dev->stats.rx_length_errors++;
			dev_kfree_skb_any(skb);
			goto next;
		}

		skb->protocol = eth_type_trans(skb, dev);
		napi_gro_receive(&priv->napi, skb);
		dev->stats.rx_packets++;
		dev->stats.rx_bytes += skb->len;
next:
		pos = dma_ring_incr(pos, RX_DESC_NUM);
	}

	if (pos != start)
		writel_relaxed(dma_byte(pos), priv->base + RX_BQ_RD_ADDR);

	hix5hd2_rx_refill(priv);

	return num;
}

static void hix5hd2_xmit_reclaim(struct net_device *dev)
{
	struct sk_buff *skb;
	struct hix5hd2_desc *desc;
	struct hix5hd2_priv *priv = netdev_priv(dev);
	unsigned int bytes_compl = 0, pkts_compl = 0;
	u32 start, end, num, pos, i;
	dma_addr_t addr;

	netif_tx_lock(dev);

	/* software read */
	start = dma_cnt(readl_relaxed(priv->base + TX_RQ_RD_ADDR));
	/* logic write */
	end = dma_cnt(readl_relaxed(priv->base + TX_RQ_WR_ADDR));
	num = CIRC_CNT(end, start, TX_DESC_NUM);

	for (i = 0, pos = start; i < num; i++) {
		skb = priv->tx_skb[pos];
		if (unlikely(!skb)) {
			netdev_err(dev, "inconsistent tx_skb\n");
			break;
		}

		pkts_compl++;
		bytes_compl += skb->len;
		desc = priv->tx_rq.desc + pos;
		addr = le32_to_cpu(desc->buff_addr);
		dma_unmap_single(priv->dev, addr, skb->len, DMA_TO_DEVICE);
		priv->tx_skb[pos] = NULL;
		dev_consume_skb_any(skb);
		pos = dma_ring_incr(pos, TX_DESC_NUM);
	}

	if (pos != start)
		writel_relaxed(dma_byte(pos), priv->base + TX_RQ_RD_ADDR);

	netif_tx_unlock(dev);

	if (pkts_compl || bytes_compl)
		netdev_completed_queue(dev, pkts_compl, bytes_compl);

	if (unlikely(netif_queue_stopped(priv->netdev)) && pkts_compl)
		netif_wake_queue(priv->netdev);
}

static int hix5hd2_poll(struct napi_struct *napi, int budget)
{
	struct hix5hd2_priv *priv = container_of(napi,
				struct hix5hd2_priv, napi);
	struct net_device *dev = priv->netdev;
	int work_done = 0, task = budget;
	int ints, num;

	do {
		hix5hd2_xmit_reclaim(dev);
		num = hix5hd2_rx(dev, task);
		work_done += num;
		task -= num;
		if ((work_done >= budget) || (num == 0))
			break;

		ints = readl_relaxed(priv->base + RAW_PMU_INT);
		writel_relaxed(ints, priv->base + RAW_PMU_INT);
	} while (ints & DEF_INT_MASK);

	if (work_done < budget) {
		napi_complete(napi);
		hix5hd2_irq_enable(priv);
	}

	return work_done;
}

static irqreturn_t hix5hd2_interrupt(int irq, void *dev_id)
{
	struct net_device *dev = (struct net_device *)dev_id;
	struct hix5hd2_priv *priv = netdev_priv(dev);
	int ints = readl_relaxed(priv->base + RAW_PMU_INT);

	writel_relaxed(ints, priv->base + RAW_PMU_INT);
	if (likely(ints & DEF_INT_MASK)) {
		hix5hd2_irq_disable(priv);
		napi_schedule(&priv->napi);
	}

	return IRQ_HANDLED;
}

static int hix5hd2_net_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);
	struct hix5hd2_desc *desc;
	dma_addr_t addr;
	u32 pos;

	/* software write pointer */
	pos = dma_cnt(readl_relaxed(priv->base + TX_BQ_WR_ADDR));
	if (unlikely(priv->tx_skb[pos])) {
		dev->stats.tx_dropped++;
		dev->stats.tx_fifo_errors++;
		netif_stop_queue(dev);
		return NETDEV_TX_BUSY;
	}

	addr = dma_map_single(priv->dev, skb->data, skb->len, DMA_TO_DEVICE);
	if (dma_mapping_error(priv->dev, addr)) {
		dev_kfree_skb_any(skb);
		return NETDEV_TX_OK;
	}

	desc = priv->tx_bq.desc + pos;
	desc->buff_addr = cpu_to_le32(addr);
	priv->tx_skb[pos] = skb;
	desc->cmd = cpu_to_le32(DESC_VLD_BUSY | DESC_FL_FULL |
				(skb->len & DESC_DATA_MASK) << DESC_DATA_LEN_OFF |
				(skb->len & DESC_DATA_MASK) << DESC_BUFF_LEN_OFF);

	/* ensure desc updated */
	wmb();

	pos = dma_ring_incr(pos, TX_DESC_NUM);
	writel_relaxed(dma_byte(pos), priv->base + TX_BQ_WR_ADDR);

	dev->trans_start = jiffies;
	dev->stats.tx_packets++;
	dev->stats.tx_bytes += skb->len;
	netdev_sent_queue(dev, skb->len);

	return NETDEV_TX_OK;
}

static void hix5hd2_free_dma_desc_rings(struct hix5hd2_priv *priv)
{
	struct hix5hd2_desc *desc;
	dma_addr_t addr;
	int i;

	for (i = 0; i < RX_DESC_NUM; i++) {
		struct sk_buff *skb = priv->rx_skb[i];
		if (skb == NULL)
			continue;

		desc = priv->rx_fq.desc + i;
		addr = le32_to_cpu(desc->buff_addr);
		dma_unmap_single(priv->dev, addr,
				 MAC_MAX_FRAME_SIZE, DMA_FROM_DEVICE);
		dev_kfree_skb_any(skb);
		priv->rx_skb[i] = NULL;
	}

	for (i = 0; i < TX_DESC_NUM; i++) {
		struct sk_buff *skb = priv->tx_skb[i];
		if (skb == NULL)
			continue;

		desc = priv->tx_rq.desc + i;
		addr = le32_to_cpu(desc->buff_addr);
		dma_unmap_single(priv->dev, addr, skb->len, DMA_TO_DEVICE);
		dev_kfree_skb_any(skb);
		priv->tx_skb[i] = NULL;
	}
}

static int hix5hd2_net_open(struct net_device *dev)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);
	int ret;

	ret = clk_prepare_enable(priv->clk);
	if (ret < 0) {
		netdev_err(dev, "failed to enable clk %d\n", ret);
		return ret;
	}

	priv->phy = of_phy_connect(dev, priv->phy_node,
				   &hix5hd2_adjust_link, 0, priv->phy_mode);
	if (!priv->phy)
		return -ENODEV;

	phy_start(priv->phy);
	hix5hd2_hw_init(priv);
	hix5hd2_rx_refill(priv);

	netdev_reset_queue(dev);
	netif_start_queue(dev);
	napi_enable(&priv->napi);

	hix5hd2_port_enable(priv);
	hix5hd2_irq_enable(priv);

	return 0;
}

static int hix5hd2_net_close(struct net_device *dev)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);

	hix5hd2_port_disable(priv);
	hix5hd2_irq_disable(priv);
	napi_disable(&priv->napi);
	netif_stop_queue(dev);
	hix5hd2_free_dma_desc_rings(priv);

	if (priv->phy) {
		phy_stop(priv->phy);
		phy_disconnect(priv->phy);
	}

	clk_disable_unprepare(priv->clk);

	return 0;
}

static void hix5hd2_tx_timeout_task(struct work_struct *work)
{
	struct hix5hd2_priv *priv;

	priv = container_of(work, struct hix5hd2_priv, tx_timeout_task);
	hix5hd2_net_close(priv->netdev);
	hix5hd2_net_open(priv->netdev);
}

static void hix5hd2_net_timeout(struct net_device *dev)
{
	struct hix5hd2_priv *priv = netdev_priv(dev);

	schedule_work(&priv->tx_timeout_task);
}

static const struct net_device_ops hix5hd2_netdev_ops = {
	.ndo_open		= hix5hd2_net_open,
	.ndo_stop		= hix5hd2_net_close,
	.ndo_start_xmit		= hix5hd2_net_xmit,
	.ndo_tx_timeout		= hix5hd2_net_timeout,
	.ndo_set_mac_address	= hix5hd2_net_set_mac_address,
};

static int hix5hd2_get_settings(struct net_device *net_dev,
				struct ethtool_cmd *cmd)
{
	struct hix5hd2_priv *priv = netdev_priv(net_dev);

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

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

static int hix5hd2_set_settings(struct net_device *net_dev,
				struct ethtool_cmd *cmd)
{
	struct hix5hd2_priv *priv = netdev_priv(net_dev);

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

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

static struct ethtool_ops hix5hd2_ethtools_ops = {
	.get_link		= ethtool_op_get_link,
	.get_settings		= hix5hd2_get_settings,
	.set_settings		= hix5hd2_set_settings,
};

static int hix5hd2_mdio_wait_ready(struct mii_bus *bus)
{
	struct hix5hd2_priv *priv = bus->priv;
	void __iomem *base = priv->base;
	int i, timeout = 10000;

	for (i = 0; readl_relaxed(base + MDIO_SINGLE_CMD) & MDIO_START; i++) {
		if (i == timeout)
			return -ETIMEDOUT;
		usleep_range(10, 20);
	}

	return 0;
}

static int hix5hd2_mdio_read(struct mii_bus *bus, int phy, int reg)
{
	struct hix5hd2_priv *priv = bus->priv;
	void __iomem *base = priv->base;
	int val, ret;

	ret = hix5hd2_mdio_wait_ready(bus);
	if (ret < 0)
		goto out;

	writel_relaxed(MDIO_READ | phy << 8 | reg, base + MDIO_SINGLE_CMD);
	ret = hix5hd2_mdio_wait_ready(bus);
	if (ret < 0)
		goto out;

	val = readl_relaxed(base + MDIO_RDATA_STATUS);
	if (val & MDIO_R_VALID) {
		dev_err(bus->parent, "SMI bus read not valid\n");
		ret = -ENODEV;
		goto out;
	}

	val = readl_relaxed(priv->base + MDIO_SINGLE_DATA);
	ret = (val >> 16) & 0xFFFF;
out:
	return ret;
}

static int hix5hd2_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val)
{
	struct hix5hd2_priv *priv = bus->priv;
	void __iomem *base = priv->base;
	int ret;

	ret = hix5hd2_mdio_wait_ready(bus);
	if (ret < 0)
		goto out;

	writel_relaxed(val, base + MDIO_SINGLE_DATA);
	writel_relaxed(MDIO_WRITE | phy << 8 | reg, base + MDIO_SINGLE_CMD);
	ret = hix5hd2_mdio_wait_ready(bus);
out:
	return ret;
}

static void hix5hd2_destroy_hw_desc_queue(struct hix5hd2_priv *priv)
{
	int i;

	for (i = 0; i < QUEUE_NUMS; i++) {
		if (priv->pool[i].desc) {
			dma_free_coherent(priv->dev, priv->pool[i].size,
					  priv->pool[i].desc,
					  priv->pool[i].phys_addr);
			priv->pool[i].desc = NULL;
		}
	}
}

static int hix5hd2_init_hw_desc_queue(struct hix5hd2_priv *priv)
{
	struct device *dev = priv->dev;
	struct hix5hd2_desc *virt_addr;
	dma_addr_t phys_addr;
	int size, i;

	priv->rx_fq.count = RX_DESC_NUM;
	priv->rx_bq.count = RX_DESC_NUM;
	priv->tx_bq.count = TX_DESC_NUM;
	priv->tx_rq.count = TX_DESC_NUM;

	for (i = 0; i < QUEUE_NUMS; i++) {
		size = priv->pool[i].count * sizeof(struct hix5hd2_desc);
		virt_addr = dma_alloc_coherent(dev, size, &phys_addr,
					       GFP_KERNEL);
		if (virt_addr == NULL)
			goto error_free_pool;

		memset(virt_addr, 0, size);
		priv->pool[i].size = size;
		priv->pool[i].desc = virt_addr;
		priv->pool[i].phys_addr = phys_addr;
	}
	return 0;

error_free_pool:
	hix5hd2_destroy_hw_desc_queue(priv);

	return -ENOMEM;
}

static int hix5hd2_dev_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *node = dev->of_node;
	struct net_device *ndev;
	struct hix5hd2_priv *priv;
	struct resource *res;
	struct mii_bus *bus;
	const char *mac_addr;
	int ret;

	ndev = alloc_etherdev(sizeof(struct hix5hd2_priv));
	if (!ndev)
		return -ENOMEM;

	platform_set_drvdata(pdev, ndev);

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->base)) {
		ret = PTR_ERR(priv->base);
		goto out_free_netdev;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	priv->ctrl_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->ctrl_base)) {
		ret = PTR_ERR(priv->ctrl_base);
		goto out_free_netdev;
	}

	priv->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(priv->clk)) {
		netdev_err(ndev, "failed to get clk\n");
		ret = -ENODEV;
		goto out_free_netdev;
	}

	ret = clk_prepare_enable(priv->clk);
	if (ret < 0) {
		netdev_err(ndev, "failed to enable clk %d\n", ret);
		goto out_free_netdev;
	}

	bus = mdiobus_alloc();
	if (bus == NULL) {
		ret = -ENOMEM;
		goto out_free_netdev;
	}

	bus->priv = priv;
	bus->name = "hix5hd2_mii_bus";
	bus->read = hix5hd2_mdio_read;
	bus->write = hix5hd2_mdio_write;
	bus->parent = &pdev->dev;
	snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
	priv->bus = bus;

	ret = of_mdiobus_register(bus, node);
	if (ret)
		goto err_free_mdio;

	priv->phy_mode = of_get_phy_mode(node);
	if (priv->phy_mode < 0) {
		netdev_err(ndev, "not find phy-mode\n");
		ret = -EINVAL;
		goto err_mdiobus;
	}

	priv->phy_node = of_parse_phandle(node, "phy-handle", 0);
	if (!priv->phy_node) {
		netdev_err(ndev, "not find phy-handle\n");
		ret = -EINVAL;
		goto err_mdiobus;
	}

	ndev->irq = platform_get_irq(pdev, 0);
	if (ndev->irq <= 0) {
		netdev_err(ndev, "No irq resource\n");
		ret = -EINVAL;
		goto out_phy_node;
	}

	ret = devm_request_irq(dev, ndev->irq, hix5hd2_interrupt,
			       0, pdev->name, ndev);
	if (ret) {
		netdev_err(ndev, "devm_request_irq failed\n");
		goto out_phy_node;
	}

	mac_addr = of_get_mac_address(node);
	if (mac_addr)
		ether_addr_copy(ndev->dev_addr, mac_addr);
	if (!is_valid_ether_addr(ndev->dev_addr)) {
		eth_hw_addr_random(ndev);
		netdev_warn(ndev, "using random MAC address %pM\n",
			    ndev->dev_addr);
	}

	INIT_WORK(&priv->tx_timeout_task, hix5hd2_tx_timeout_task);
	ndev->watchdog_timeo = 6 * HZ;
	ndev->priv_flags |= IFF_UNICAST_FLT;
	ndev->netdev_ops = &hix5hd2_netdev_ops;
	ndev->ethtool_ops = &hix5hd2_ethtools_ops;
	SET_NETDEV_DEV(ndev, dev);

	ret = hix5hd2_init_hw_desc_queue(priv);
	if (ret)
		goto out_phy_node;

	netif_napi_add(ndev, &priv->napi, hix5hd2_poll, NAPI_POLL_WEIGHT);
	ret = register_netdev(priv->netdev);
	if (ret) {
		netdev_err(ndev, "register_netdev failed!");
		goto out_destroy_queue;
	}

	clk_disable_unprepare(priv->clk);

	return ret;

out_destroy_queue:
	netif_napi_del(&priv->napi);
	hix5hd2_destroy_hw_desc_queue(priv);
out_phy_node:
	of_node_put(priv->phy_node);
err_mdiobus:
	mdiobus_unregister(bus);
err_free_mdio:
	mdiobus_free(bus);
out_free_netdev:
	free_netdev(ndev);

	return ret;
}

static int hix5hd2_dev_remove(struct platform_device *pdev)
{
	struct net_device *ndev = platform_get_drvdata(pdev);
	struct hix5hd2_priv *priv = netdev_priv(ndev);

	netif_napi_del(&priv->napi);
	unregister_netdev(ndev);
	mdiobus_unregister(priv->bus);
	mdiobus_free(priv->bus);

	hix5hd2_destroy_hw_desc_queue(priv);
	of_node_put(priv->phy_node);
	cancel_work_sync(&priv->tx_timeout_task);
	free_netdev(ndev);

	return 0;
}

static const struct of_device_id hix5hd2_of_match[] = {
	{.compatible = "hisilicon,hix5hd2-gmac",},
	{},
};

MODULE_DEVICE_TABLE(of, hix5hd2_of_match);

static struct platform_driver hix5hd2_dev_driver = {
	.driver = {
		.name = "hix5hd2-gmac",
		.of_match_table = hix5hd2_of_match,
	},
	.probe = hix5hd2_dev_probe,
	.remove = hix5hd2_dev_remove,
};

module_platform_driver(hix5hd2_dev_driver);

MODULE_DESCRIPTION("HISILICON HIX5HD2 Ethernet driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:hix5hd2-gmac");