summaryrefslogtreecommitdiffstats
path: root/drivers/phy/tegra/xusb.c
blob: 11aa5902a9ac1e39a3bb3a4e3b085dbf7a783d19 (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
/*
 * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/phy/tegra/xusb.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#include <soc/tegra/fuse.h>

#include "xusb.h"

static struct phy *tegra_xusb_pad_of_xlate(struct device *dev,
					   struct of_phandle_args *args)
{
	struct tegra_xusb_pad *pad = dev_get_drvdata(dev);
	struct phy *phy = NULL;
	unsigned int i;

	if (args->args_count != 0)
		return ERR_PTR(-EINVAL);

	for (i = 0; i < pad->soc->num_lanes; i++) {
		if (!pad->lanes[i])
			continue;

		if (pad->lanes[i]->dev.of_node == args->np) {
			phy = pad->lanes[i];
			break;
		}
	}

	if (phy == NULL)
		phy = ERR_PTR(-ENODEV);

	return phy;
}

static const struct of_device_id tegra_xusb_padctl_of_match[] = {
#if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC)
	{
		.compatible = "nvidia,tegra124-xusb-padctl",
		.data = &tegra124_xusb_padctl_soc,
	},
#endif
#if defined(CONFIG_ARCH_TEGRA_210_SOC)
	{
		.compatible = "nvidia,tegra210-xusb-padctl",
		.data = &tegra210_xusb_padctl_soc,
	},
#endif
	{ }
};
MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match);

static struct device_node *
tegra_xusb_find_pad_node(struct tegra_xusb_padctl *padctl, const char *name)
{
	struct device_node *pads, *np;

	pads = of_get_child_by_name(padctl->dev->of_node, "pads");
	if (!pads)
		return NULL;

	np = of_get_child_by_name(pads, name);
	of_node_put(pads);

	return np;
}

static struct device_node *
tegra_xusb_pad_find_phy_node(struct tegra_xusb_pad *pad, unsigned int index)
{
	struct device_node *np, *lanes;

	lanes = of_get_child_by_name(pad->dev.of_node, "lanes");
	if (!lanes)
		return NULL;

	np = of_get_child_by_name(lanes, pad->soc->lanes[index].name);
	of_node_put(lanes);

	return np;
}

static int
tegra_xusb_lane_lookup_function(struct tegra_xusb_lane *lane,
				    const char *function)
{
	unsigned int i;

	for (i = 0; i < lane->soc->num_funcs; i++)
		if (strcmp(function, lane->soc->funcs[i]) == 0)
			return i;

	return -EINVAL;
}

int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
			     struct device_node *np)
{
	struct device *dev = &lane->pad->dev;
	const char *function;
	int err;

	err = of_property_read_string(np, "nvidia,function", &function);
	if (err < 0)
		return err;

	err = tegra_xusb_lane_lookup_function(lane, function);
	if (err < 0) {
		dev_err(dev, "invalid function \"%s\" for lane \"%s\"\n",
			function, np->name);
		return err;
	}

	lane->function = err;

	return 0;
}

static void tegra_xusb_lane_destroy(struct phy *phy)
{
	if (phy) {
		struct tegra_xusb_lane *lane = phy_get_drvdata(phy);

		lane->pad->ops->remove(lane);
		phy_destroy(phy);
	}
}

static void tegra_xusb_pad_release(struct device *dev)
{
	struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev);

	pad->soc->ops->remove(pad);
}

static struct device_type tegra_xusb_pad_type = {
	.release = tegra_xusb_pad_release,
};

int tegra_xusb_pad_init(struct tegra_xusb_pad *pad,
			struct tegra_xusb_padctl *padctl,
			struct device_node *np)
{
	int err;

	device_initialize(&pad->dev);
	INIT_LIST_HEAD(&pad->list);
	pad->dev.parent = padctl->dev;
	pad->dev.type = &tegra_xusb_pad_type;
	pad->dev.of_node = np;
	pad->padctl = padctl;

	err = dev_set_name(&pad->dev, "%s", pad->soc->name);
	if (err < 0)
		goto unregister;

	err = device_add(&pad->dev);
	if (err < 0)
		goto unregister;

	return 0;

unregister:
	device_unregister(&pad->dev);
	return err;
}

int tegra_xusb_pad_register(struct tegra_xusb_pad *pad,
			    const struct phy_ops *ops)
{
	struct device_node *children;
	struct phy *lane;
	unsigned int i;
	int err;

	children = of_get_child_by_name(pad->dev.of_node, "lanes");
	if (!children)
		return -ENODEV;

	pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane),
				  GFP_KERNEL);
	if (!pad->lanes) {
		of_node_put(children);
		return -ENOMEM;
	}

	for (i = 0; i < pad->soc->num_lanes; i++) {
		struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i);
		struct tegra_xusb_lane *lane;

		/* skip disabled lanes */
		if (!np || !of_device_is_available(np)) {
			of_node_put(np);
			continue;
		}

		pad->lanes[i] = phy_create(&pad->dev, np, ops);
		if (IS_ERR(pad->lanes[i])) {
			err = PTR_ERR(pad->lanes[i]);
			of_node_put(np);
			goto remove;
		}

		lane = pad->ops->probe(pad, np, i);
		if (IS_ERR(lane)) {
			phy_destroy(pad->lanes[i]);
			err = PTR_ERR(lane);
			goto remove;
		}

		list_add_tail(&lane->list, &pad->padctl->lanes);
		phy_set_drvdata(pad->lanes[i], lane);
	}

	pad->provider = of_phy_provider_register_full(&pad->dev, children,
						      tegra_xusb_pad_of_xlate);
	if (IS_ERR(pad->provider)) {
		err = PTR_ERR(pad->provider);
		goto remove;
	}

	return 0;

remove:
	while (i--)
		tegra_xusb_lane_destroy(pad->lanes[i]);

	of_node_put(children);

	return err;
}

void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad)
{
	unsigned int i = pad->soc->num_lanes;

	of_phy_provider_unregister(pad->provider);

	while (i--)
		tegra_xusb_lane_destroy(pad->lanes[i]);

	device_unregister(&pad->dev);
}

static struct tegra_xusb_pad *
tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl,
		      const struct tegra_xusb_pad_soc *soc)
{
	struct tegra_xusb_pad *pad;
	struct device_node *np;
	int err;

	np = tegra_xusb_find_pad_node(padctl, soc->name);
	if (!np || !of_device_is_available(np))
		return NULL;

	pad = soc->ops->probe(padctl, soc, np);
	if (IS_ERR(pad)) {
		err = PTR_ERR(pad);
		dev_err(padctl->dev, "failed to create pad %s: %d\n",
			soc->name, err);
		return ERR_PTR(err);
	}

	/* XXX move this into ->probe() to avoid string comparison */
	if (strcmp(soc->name, "pcie") == 0)
		padctl->pcie = pad;

	if (strcmp(soc->name, "sata") == 0)
		padctl->sata = pad;

	if (strcmp(soc->name, "usb2") == 0)
		padctl->usb2 = pad;

	if (strcmp(soc->name, "ulpi") == 0)
		padctl->ulpi = pad;

	if (strcmp(soc->name, "hsic") == 0)
		padctl->hsic = pad;

	return pad;
}

static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
{
	struct tegra_xusb_pad *pad, *tmp;

	list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) {
		list_del(&pad->list);
		tegra_xusb_pad_unregister(pad);
	}
}

static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
{
	mutex_lock(&padctl->lock);
	__tegra_xusb_remove_pads(padctl);
	mutex_unlock(&padctl->lock);
}

static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
{
	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
	const struct tegra_xusb_lane_soc *soc = lane->soc;
	u32 value;

	/* choose function */
	value = padctl_readl(padctl, soc->offset);
	value &= ~(soc->mask << soc->shift);
	value |= lane->function << soc->shift;
	padctl_writel(padctl, value, soc->offset);
}

static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad)
{
	unsigned int i;

	for (i = 0; i < pad->soc->num_lanes; i++) {
		struct tegra_xusb_lane *lane;

		if (pad->lanes[i]) {
			lane = phy_get_drvdata(pad->lanes[i]);
			tegra_xusb_lane_program(lane);
		}
	}
}

static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl)
{
	struct tegra_xusb_pad *pad;
	unsigned int i;

	mutex_lock(&padctl->lock);

	for (i = 0; i < padctl->soc->num_pads; i++) {
		const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i];
		int err;

		pad = tegra_xusb_pad_create(padctl, soc);
		if (IS_ERR(pad)) {
			err = PTR_ERR(pad);
			dev_err(padctl->dev, "failed to create pad %s: %d\n",
				soc->name, err);
			__tegra_xusb_remove_pads(padctl);
			mutex_unlock(&padctl->lock);
			return err;
		}

		if (!pad)
			continue;

		list_add_tail(&pad->list, &padctl->pads);
	}

	list_for_each_entry(pad, &padctl->pads, list)
		tegra_xusb_pad_program(pad);

	mutex_unlock(&padctl->lock);
	return 0;
}

static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane,
				  const char *function)
{
	const char *func = lane->soc->funcs[lane->function];

	return strcmp(function, func) == 0;
}

struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl,
					     const char *type,
					     unsigned int index)
{
	struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV);
	char *name;

	name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
	if (!name)
		return ERR_PTR(-ENOMEM);

	list_for_each_entry(lane, &padctl->lanes, list) {
		if (strcmp(lane->soc->name, name) == 0) {
			hit = lane;
			break;
		}
	}

	kfree(name);
	return hit;
}

struct tegra_xusb_lane *
tegra_xusb_port_find_lane(struct tegra_xusb_port *port,
			  const struct tegra_xusb_lane_map *map,
			  const char *function)
{
	struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV);

	for (; map->type; map++) {
		if (port->index != map->port)
			continue;

		lane = tegra_xusb_find_lane(port->padctl, map->type,
					    map->index);
		if (IS_ERR(lane))
			continue;

		if (!tegra_xusb_lane_check(lane, function))
			continue;

		if (!IS_ERR(match))
			dev_err(&port->dev, "conflicting match: %s-%u / %s\n",
				map->type, map->index, match->soc->name);
		else
			match = lane;
	}

	return match;
}

static struct device_node *
tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type,
			  unsigned int index)
{
	struct device_node *ports, *np;
	char *name;

	ports = of_get_child_by_name(padctl->dev->of_node, "ports");
	if (!ports)
		return NULL;

	name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
	if (!name) {
		of_node_put(ports);
		return ERR_PTR(-ENOMEM);
	}
	np = of_get_child_by_name(ports, name);
	kfree(name);
	of_node_put(ports);

	return np;
}

struct tegra_xusb_port *
tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type,
		     unsigned int index)
{
	struct tegra_xusb_port *port;
	struct device_node *np;

	np = tegra_xusb_find_port_node(padctl, type, index);
	if (!np)
		return NULL;

	list_for_each_entry(port, &padctl->ports, list) {
		if (np == port->dev.of_node) {
			of_node_put(np);
			return port;
		}
	}

	of_node_put(np);

	return NULL;
}

struct tegra_xusb_usb2_port *
tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index)
{
	struct tegra_xusb_port *port;

	port = tegra_xusb_find_port(padctl, "usb2", index);
	if (port)
		return to_usb2_port(port);

	return NULL;
}

struct tegra_xusb_usb3_port *
tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index)
{
	struct tegra_xusb_port *port;

	port = tegra_xusb_find_port(padctl, "usb3", index);
	if (port)
		return to_usb3_port(port);

	return NULL;
}

static void tegra_xusb_port_release(struct device *dev)
{
}

static struct device_type tegra_xusb_port_type = {
	.release = tegra_xusb_port_release,
};

static int tegra_xusb_port_init(struct tegra_xusb_port *port,
				struct tegra_xusb_padctl *padctl,
				struct device_node *np,
				const char *name,
				unsigned int index)
{
	int err;

	INIT_LIST_HEAD(&port->list);
	port->padctl = padctl;
	port->index = index;

	device_initialize(&port->dev);
	port->dev.type = &tegra_xusb_port_type;
	port->dev.of_node = of_node_get(np);
	port->dev.parent = padctl->dev;

	err = dev_set_name(&port->dev, "%s-%u", name, index);
	if (err < 0)
		goto unregister;

	err = device_add(&port->dev);
	if (err < 0)
		goto unregister;

	return 0;

unregister:
	device_unregister(&port->dev);
	return err;
}

static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
{
	device_unregister(&port->dev);
}

static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
{
	struct tegra_xusb_port *port = &usb2->base;
	struct device_node *np = port->dev.of_node;

	usb2->internal = of_property_read_bool(np, "nvidia,internal");

	usb2->supply = devm_regulator_get(&port->dev, "vbus");
	return PTR_ERR_OR_ZERO(usb2->supply);
}

static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl,
				    unsigned int index)
{
	struct tegra_xusb_usb2_port *usb2;
	struct device_node *np;
	int err = 0;

	/*
	 * USB2 ports don't require additional properties, but if the port is
	 * marked as disabled there is no reason to register it.
	 */
	np = tegra_xusb_find_port_node(padctl, "usb2", index);
	if (!np || !of_device_is_available(np))
		goto out;

	usb2 = devm_kzalloc(padctl->dev, sizeof(*usb2), GFP_KERNEL);
	if (!usb2) {
		err = -ENOMEM;
		goto out;
	}

	err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index);
	if (err < 0)
		goto out;

	usb2->base.ops = padctl->soc->ports.usb2.ops;

	usb2->base.lane = usb2->base.ops->map(&usb2->base);
	if (IS_ERR(usb2->base.lane)) {
		err = PTR_ERR(usb2->base.lane);
		goto out;
	}

	err = tegra_xusb_usb2_port_parse_dt(usb2);
	if (err < 0) {
		tegra_xusb_port_unregister(&usb2->base);
		goto out;
	}

	list_add_tail(&usb2->base.list, &padctl->ports);

out:
	of_node_put(np);
	return err;
}

static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi)
{
	struct tegra_xusb_port *port = &ulpi->base;
	struct device_node *np = port->dev.of_node;

	ulpi->internal = of_property_read_bool(np, "nvidia,internal");

	return 0;
}

static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl,
				    unsigned int index)
{
	struct tegra_xusb_ulpi_port *ulpi;
	struct device_node *np;
	int err = 0;

	np = tegra_xusb_find_port_node(padctl, "ulpi", index);
	if (!np || !of_device_is_available(np))
		goto out;

	ulpi = devm_kzalloc(padctl->dev, sizeof(*ulpi), GFP_KERNEL);
	if (!ulpi) {
		err = -ENOMEM;
		goto out;
	}

	err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index);
	if (err < 0)
		goto out;

	ulpi->base.ops = padctl->soc->ports.ulpi.ops;

	ulpi->base.lane = ulpi->base.ops->map(&ulpi->base);
	if (IS_ERR(ulpi->base.lane)) {
		err = PTR_ERR(ulpi->base.lane);
		goto out;
	}

	err = tegra_xusb_ulpi_port_parse_dt(ulpi);
	if (err < 0) {
		tegra_xusb_port_unregister(&ulpi->base);
		goto out;
	}

	list_add_tail(&ulpi->base.list, &padctl->ports);

out:
	of_node_put(np);
	return err;
}

static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic)
{
	/* XXX */
	return 0;
}

static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl,
				    unsigned int index)
{
	struct tegra_xusb_hsic_port *hsic;
	struct device_node *np;
	int err = 0;

	np = tegra_xusb_find_port_node(padctl, "hsic", index);
	if (!np || !of_device_is_available(np))
		goto out;

	hsic = devm_kzalloc(padctl->dev, sizeof(*hsic), GFP_KERNEL);
	if (!hsic) {
		err = -ENOMEM;
		goto out;
	}

	err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index);
	if (err < 0)
		goto out;

	hsic->base.ops = padctl->soc->ports.hsic.ops;

	hsic->base.lane = hsic->base.ops->map(&hsic->base);
	if (IS_ERR(hsic->base.lane)) {
		err = PTR_ERR(hsic->base.lane);
		goto out;
	}

	err = tegra_xusb_hsic_port_parse_dt(hsic);
	if (err < 0) {
		tegra_xusb_port_unregister(&hsic->base);
		goto out;
	}

	list_add_tail(&hsic->base.list, &padctl->ports);

out:
	of_node_put(np);
	return err;
}

static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3)
{
	struct tegra_xusb_port *port = &usb3->base;
	struct device_node *np = port->dev.of_node;
	u32 value;
	int err;

	err = of_property_read_u32(np, "nvidia,usb2-companion", &value);
	if (err < 0) {
		dev_err(&port->dev, "failed to read port: %d\n", err);
		return err;
	}

	usb3->port = value;

	usb3->internal = of_property_read_bool(np, "nvidia,internal");

	usb3->supply = devm_regulator_get(&port->dev, "vbus");
	return PTR_ERR_OR_ZERO(usb3->supply);
}

static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl,
				    unsigned int index)
{
	struct tegra_xusb_usb3_port *usb3;
	struct device_node *np;
	int err = 0;

	/*
	 * If there is no supplemental configuration in the device tree the
	 * port is unusable. But it is valid to configure only a single port,
	 * hence return 0 instead of an error to allow ports to be optional.
	 */
	np = tegra_xusb_find_port_node(padctl, "usb3", index);
	if (!np || !of_device_is_available(np))
		goto out;

	usb3 = devm_kzalloc(padctl->dev, sizeof(*usb3), GFP_KERNEL);
	if (!usb3) {
		err = -ENOMEM;
		goto out;
	}

	err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index);
	if (err < 0)
		goto out;

	usb3->base.ops = padctl->soc->ports.usb3.ops;

	usb3->base.lane = usb3->base.ops->map(&usb3->base);
	if (IS_ERR(usb3->base.lane)) {
		err = PTR_ERR(usb3->base.lane);
		goto out;
	}

	err = tegra_xusb_usb3_port_parse_dt(usb3);
	if (err < 0) {
		tegra_xusb_port_unregister(&usb3->base);
		goto out;
	}

	list_add_tail(&usb3->base.list, &padctl->ports);

out:
	of_node_put(np);
	return err;
}

static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
{
	struct tegra_xusb_port *port, *tmp;

	list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) {
		list_del(&port->list);
		tegra_xusb_port_unregister(port);
	}
}

static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl)
{
	struct tegra_xusb_port *port;
	unsigned int i;
	int err = 0;

	mutex_lock(&padctl->lock);

	for (i = 0; i < padctl->soc->ports.usb2.count; i++) {
		err = tegra_xusb_add_usb2_port(padctl, i);
		if (err < 0)
			goto remove_ports;
	}

	for (i = 0; i < padctl->soc->ports.ulpi.count; i++) {
		err = tegra_xusb_add_ulpi_port(padctl, i);
		if (err < 0)
			goto remove_ports;
	}

	for (i = 0; i < padctl->soc->ports.hsic.count; i++) {
		err = tegra_xusb_add_hsic_port(padctl, i);
		if (err < 0)
			goto remove_ports;
	}

	for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
		err = tegra_xusb_add_usb3_port(padctl, i);
		if (err < 0)
			goto remove_ports;
	}

	list_for_each_entry(port, &padctl->ports, list) {
		err = port->ops->enable(port);
		if (err < 0)
			dev_err(padctl->dev, "failed to enable port %s: %d\n",
				dev_name(&port->dev), err);
	}

	goto unlock;

remove_ports:
	__tegra_xusb_remove_ports(padctl);
unlock:
	mutex_unlock(&padctl->lock);
	return err;
}

static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
{
	mutex_lock(&padctl->lock);
	__tegra_xusb_remove_ports(padctl);
	mutex_unlock(&padctl->lock);
}

static int tegra_xusb_padctl_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	const struct tegra_xusb_padctl_soc *soc;
	struct tegra_xusb_padctl *padctl;
	const struct of_device_id *match;
	struct resource *res;
	int err;

	/* for backwards compatibility with old device trees */
	np = of_get_child_by_name(np, "pads");
	if (!np) {
		dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n");
		return tegra_xusb_padctl_legacy_probe(pdev);
	}

	of_node_put(np);

	match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node);
	soc = match->data;

	padctl = soc->ops->probe(&pdev->dev, soc);
	if (IS_ERR(padctl))
		return PTR_ERR(padctl);

	platform_set_drvdata(pdev, padctl);
	INIT_LIST_HEAD(&padctl->ports);
	INIT_LIST_HEAD(&padctl->lanes);
	INIT_LIST_HEAD(&padctl->pads);
	mutex_init(&padctl->lock);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	padctl->regs = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(padctl->regs)) {
		err = PTR_ERR(padctl->regs);
		goto remove;
	}

	padctl->rst = devm_reset_control_get(&pdev->dev, NULL);
	if (IS_ERR(padctl->rst)) {
		err = PTR_ERR(padctl->rst);
		goto remove;
	}

	err = reset_control_deassert(padctl->rst);
	if (err < 0)
		goto remove;

	err = tegra_xusb_setup_pads(padctl);
	if (err < 0) {
		dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
		goto reset;
	}

	err = tegra_xusb_setup_ports(padctl);
	if (err) {
		dev_err(&pdev->dev, "failed to setup XUSB ports: %d\n", err);
		goto remove_pads;
	}

	return 0;

remove_pads:
	tegra_xusb_remove_pads(padctl);
reset:
	reset_control_assert(padctl->rst);
remove:
	soc->ops->remove(padctl);
	return err;
}

static int tegra_xusb_padctl_remove(struct platform_device *pdev)
{
	struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
	int err;

	tegra_xusb_remove_ports(padctl);
	tegra_xusb_remove_pads(padctl);

	err = reset_control_assert(padctl->rst);
	if (err < 0)
		dev_err(&pdev->dev, "failed to assert reset: %d\n", err);

	padctl->soc->ops->remove(padctl);

	return err;
}

static struct platform_driver tegra_xusb_padctl_driver = {
	.driver = {
		.name = "tegra-xusb-padctl",
		.of_match_table = tegra_xusb_padctl_of_match,
	},
	.probe = tegra_xusb_padctl_probe,
	.remove = tegra_xusb_padctl_remove,
};
module_platform_driver(tegra_xusb_padctl_driver);

struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev)
{
	struct tegra_xusb_padctl *padctl;
	struct platform_device *pdev;
	struct device_node *np;

	np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0);
	if (!np)
		return ERR_PTR(-EINVAL);

	/*
	 * This is slightly ugly. A better implementation would be to keep a
	 * registry of pad controllers, but since there will almost certainly
	 * only ever be one per SoC that would be a little overkill.
	 */
	pdev = of_find_device_by_node(np);
	if (!pdev) {
		of_node_put(np);
		return ERR_PTR(-ENODEV);
	}

	of_node_put(np);

	padctl = platform_get_drvdata(pdev);
	if (!padctl) {
		put_device(&pdev->dev);
		return ERR_PTR(-EPROBE_DEFER);
	}

	return padctl;
}
EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get);

void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl)
{
	if (padctl)
		put_device(padctl->dev);
}
EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put);

int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl,
					unsigned int port)
{
	if (padctl->soc->ops->usb3_save_context)
		return padctl->soc->ops->usb3_save_context(padctl, port);

	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context);

int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
				    unsigned int port, bool idle)
{
	if (padctl->soc->ops->hsic_set_idle)
		return padctl->soc->ops->hsic_set_idle(padctl, port, idle);

	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);

int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
					   unsigned int port, bool enable)
{
	if (padctl->soc->ops->usb3_set_lfps_detect)
		return padctl->soc->ops->usb3_set_lfps_detect(padctl, port,
							      enable);

	return -ENOSYS;
}
EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);

MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
MODULE_LICENSE("GPL v2");