xref: /openbmc/linux/drivers/phy/tegra/xusb.c (revision 2d972b6a) 
1 /*
2  * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms and conditions of the GNU General Public License,
6  * version 2, as published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope it will be useful, but WITHOUT
9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
11  * more details.
12  */
13 
14 #include <linux/delay.h>
15 #include <linux/io.h>
16 #include <linux/mailbox_client.h>
17 #include <linux/module.h>
18 #include <linux/of.h>
19 #include <linux/of_device.h>
20 #include <linux/phy/phy.h>
21 #include <linux/phy/tegra/xusb.h>
22 #include <linux/platform_device.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/reset.h>
25 #include <linux/slab.h>
26 #include <linux/workqueue.h>
27 
28 #include <soc/tegra/fuse.h>
29 
30 #include "xusb.h"
31 
32 static struct phy *tegra_xusb_pad_of_xlate(struct device *dev,
33 					   struct of_phandle_args *args)
34 {
35 	struct tegra_xusb_pad *pad = dev_get_drvdata(dev);
36 	struct phy *phy = NULL;
37 	unsigned int i;
38 
39 	if (args->args_count != 0)
40 		return ERR_PTR(-EINVAL);
41 
42 	for (i = 0; i < pad->soc->num_lanes; i++) {
43 		if (!pad->lanes[i])
44 			continue;
45 
46 		if (pad->lanes[i]->dev.of_node == args->np) {
47 			phy = pad->lanes[i];
48 			break;
49 		}
50 	}
51 
52 	if (phy == NULL)
53 		phy = ERR_PTR(-ENODEV);
54 
55 	return phy;
56 }
57 
58 static const struct of_device_id tegra_xusb_padctl_of_match[] = {
59 #if defined(CONFIG_ARCH_TEGRA_124_SOC) || defined(CONFIG_ARCH_TEGRA_132_SOC)
60 	{
61 		.compatible = "nvidia,tegra124-xusb-padctl",
62 		.data = &tegra124_xusb_padctl_soc,
63 	},
64 #endif
65 #if defined(CONFIG_ARCH_TEGRA_210_SOC)
66 	{
67 		.compatible = "nvidia,tegra210-xusb-padctl",
68 		.data = &tegra210_xusb_padctl_soc,
69 	},
70 #endif
71 	{ }
72 };
73 MODULE_DEVICE_TABLE(of, tegra_xusb_padctl_of_match);
74 
75 static struct device_node *
76 tegra_xusb_find_pad_node(struct tegra_xusb_padctl *padctl, const char *name)
77 {
78 	struct device_node *pads, *np;
79 
80 	pads = of_get_child_by_name(padctl->dev->of_node, "pads");
81 	if (!pads)
82 		return NULL;
83 
84 	np = of_get_child_by_name(pads, name);
85 	of_node_put(pads);
86 
87 	return np;
88 }
89 
90 static struct device_node *
91 tegra_xusb_pad_find_phy_node(struct tegra_xusb_pad *pad, unsigned int index)
92 {
93 	struct device_node *np, *lanes;
94 
95 	lanes = of_get_child_by_name(pad->dev.of_node, "lanes");
96 	if (!lanes)
97 		return NULL;
98 
99 	np = of_get_child_by_name(lanes, pad->soc->lanes[index].name);
100 	of_node_put(lanes);
101 
102 	return np;
103 }
104 
105 static int
106 tegra_xusb_lane_lookup_function(struct tegra_xusb_lane *lane,
107 				    const char *function)
108 {
109 	unsigned int i;
110 
111 	for (i = 0; i < lane->soc->num_funcs; i++)
112 		if (strcmp(function, lane->soc->funcs[i]) == 0)
113 			return i;
114 
115 	return -EINVAL;
116 }
117 
118 int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
119 			     struct device_node *np)
120 {
121 	struct device *dev = &lane->pad->dev;
122 	const char *function;
123 	int err;
124 
125 	err = of_property_read_string(np, "nvidia,function", &function);
126 	if (err < 0)
127 		return err;
128 
129 	err = tegra_xusb_lane_lookup_function(lane, function);
130 	if (err < 0) {
131 		dev_err(dev, "invalid function \"%s\" for lane \"%s\"\n",
132 			function, np->name);
133 		return err;
134 	}
135 
136 	lane->function = err;
137 
138 	return 0;
139 }
140 
141 static void tegra_xusb_lane_destroy(struct phy *phy)
142 {
143 	if (phy) {
144 		struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
145 
146 		lane->pad->ops->remove(lane);
147 		phy_destroy(phy);
148 	}
149 }
150 
151 static void tegra_xusb_pad_release(struct device *dev)
152 {
153 	struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev);
154 
155 	pad->soc->ops->remove(pad);
156 }
157 
158 static struct device_type tegra_xusb_pad_type = {
159 	.release = tegra_xusb_pad_release,
160 };
161 
162 int tegra_xusb_pad_init(struct tegra_xusb_pad *pad,
163 			struct tegra_xusb_padctl *padctl,
164 			struct device_node *np)
165 {
166 	int err;
167 
168 	device_initialize(&pad->dev);
169 	INIT_LIST_HEAD(&pad->list);
170 	pad->dev.parent = padctl->dev;
171 	pad->dev.type = &tegra_xusb_pad_type;
172 	pad->dev.of_node = np;
173 	pad->padctl = padctl;
174 
175 	err = dev_set_name(&pad->dev, "%s", pad->soc->name);
176 	if (err < 0)
177 		goto unregister;
178 
179 	err = device_add(&pad->dev);
180 	if (err < 0)
181 		goto unregister;
182 
183 	return 0;
184 
185 unregister:
186 	device_unregister(&pad->dev);
187 	return err;
188 }
189 
190 int tegra_xusb_pad_register(struct tegra_xusb_pad *pad,
191 			    const struct phy_ops *ops)
192 {
193 	struct device_node *children;
194 	struct phy *lane;
195 	unsigned int i;
196 	int err;
197 
198 	children = of_get_child_by_name(pad->dev.of_node, "lanes");
199 	if (!children)
200 		return -ENODEV;
201 
202 	pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane),
203 				  GFP_KERNEL);
204 	if (!pad->lanes) {
205 		of_node_put(children);
206 		return -ENOMEM;
207 	}
208 
209 	for (i = 0; i < pad->soc->num_lanes; i++) {
210 		struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i);
211 		struct tegra_xusb_lane *lane;
212 
213 		/* skip disabled lanes */
214 		if (!np || !of_device_is_available(np)) {
215 			of_node_put(np);
216 			continue;
217 		}
218 
219 		pad->lanes[i] = phy_create(&pad->dev, np, ops);
220 		if (IS_ERR(pad->lanes[i])) {
221 			err = PTR_ERR(pad->lanes[i]);
222 			of_node_put(np);
223 			goto remove;
224 		}
225 
226 		lane = pad->ops->probe(pad, np, i);
227 		if (IS_ERR(lane)) {
228 			phy_destroy(pad->lanes[i]);
229 			err = PTR_ERR(lane);
230 			goto remove;
231 		}
232 
233 		list_add_tail(&lane->list, &pad->padctl->lanes);
234 		phy_set_drvdata(pad->lanes[i], lane);
235 	}
236 
237 	pad->provider = of_phy_provider_register_full(&pad->dev, children,
238 						      tegra_xusb_pad_of_xlate);
239 	if (IS_ERR(pad->provider)) {
240 		err = PTR_ERR(pad->provider);
241 		goto remove;
242 	}
243 
244 	return 0;
245 
246 remove:
247 	while (i--)
248 		tegra_xusb_lane_destroy(pad->lanes[i]);
249 
250 	of_node_put(children);
251 
252 	return err;
253 }
254 
255 void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad)
256 {
257 	unsigned int i = pad->soc->num_lanes;
258 
259 	of_phy_provider_unregister(pad->provider);
260 
261 	while (i--)
262 		tegra_xusb_lane_destroy(pad->lanes[i]);
263 
264 	device_unregister(&pad->dev);
265 }
266 
267 static struct tegra_xusb_pad *
268 tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl,
269 		      const struct tegra_xusb_pad_soc *soc)
270 {
271 	struct tegra_xusb_pad *pad;
272 	struct device_node *np;
273 	int err;
274 
275 	np = tegra_xusb_find_pad_node(padctl, soc->name);
276 	if (!np || !of_device_is_available(np))
277 		return NULL;
278 
279 	pad = soc->ops->probe(padctl, soc, np);
280 	if (IS_ERR(pad)) {
281 		err = PTR_ERR(pad);
282 		dev_err(padctl->dev, "failed to create pad %s: %d\n",
283 			soc->name, err);
284 		return ERR_PTR(err);
285 	}
286 
287 	/* XXX move this into ->probe() to avoid string comparison */
288 	if (strcmp(soc->name, "pcie") == 0)
289 		padctl->pcie = pad;
290 
291 	if (strcmp(soc->name, "sata") == 0)
292 		padctl->sata = pad;
293 
294 	if (strcmp(soc->name, "usb2") == 0)
295 		padctl->usb2 = pad;
296 
297 	if (strcmp(soc->name, "ulpi") == 0)
298 		padctl->ulpi = pad;
299 
300 	if (strcmp(soc->name, "hsic") == 0)
301 		padctl->hsic = pad;
302 
303 	return pad;
304 }
305 
306 static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
307 {
308 	struct tegra_xusb_pad *pad, *tmp;
309 
310 	list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) {
311 		list_del(&pad->list);
312 		tegra_xusb_pad_unregister(pad);
313 	}
314 }
315 
316 static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
317 {
318 	mutex_lock(&padctl->lock);
319 	__tegra_xusb_remove_pads(padctl);
320 	mutex_unlock(&padctl->lock);
321 }
322 
323 static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
324 {
325 	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
326 	const struct tegra_xusb_lane_soc *soc = lane->soc;
327 	u32 value;
328 
329 	/* choose function */
330 	value = padctl_readl(padctl, soc->offset);
331 	value &= ~(soc->mask << soc->shift);
332 	value |= lane->function << soc->shift;
333 	padctl_writel(padctl, value, soc->offset);
334 }
335 
336 static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad)
337 {
338 	unsigned int i;
339 
340 	for (i = 0; i < pad->soc->num_lanes; i++) {
341 		struct tegra_xusb_lane *lane;
342 
343 		if (pad->lanes[i]) {
344 			lane = phy_get_drvdata(pad->lanes[i]);
345 			tegra_xusb_lane_program(lane);
346 		}
347 	}
348 }
349 
350 static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl)
351 {
352 	struct tegra_xusb_pad *pad;
353 	unsigned int i;
354 
355 	mutex_lock(&padctl->lock);
356 
357 	for (i = 0; i < padctl->soc->num_pads; i++) {
358 		const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i];
359 		int err;
360 
361 		pad = tegra_xusb_pad_create(padctl, soc);
362 		if (IS_ERR(pad)) {
363 			err = PTR_ERR(pad);
364 			dev_err(padctl->dev, "failed to create pad %s: %d\n",
365 				soc->name, err);
366 			__tegra_xusb_remove_pads(padctl);
367 			mutex_unlock(&padctl->lock);
368 			return err;
369 		}
370 
371 		if (!pad)
372 			continue;
373 
374 		list_add_tail(&pad->list, &padctl->pads);
375 	}
376 
377 	list_for_each_entry(pad, &padctl->pads, list)
378 		tegra_xusb_pad_program(pad);
379 
380 	mutex_unlock(&padctl->lock);
381 	return 0;
382 }
383 
384 static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane,
385 				  const char *function)
386 {
387 	const char *func = lane->soc->funcs[lane->function];
388 
389 	return strcmp(function, func) == 0;
390 }
391 
392 struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl,
393 					     const char *type,
394 					     unsigned int index)
395 {
396 	struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV);
397 	char *name;
398 
399 	name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
400 	if (!name)
401 		return ERR_PTR(-ENOMEM);
402 
403 	list_for_each_entry(lane, &padctl->lanes, list) {
404 		if (strcmp(lane->soc->name, name) == 0) {
405 			hit = lane;
406 			break;
407 		}
408 	}
409 
410 	kfree(name);
411 	return hit;
412 }
413 
414 struct tegra_xusb_lane *
415 tegra_xusb_port_find_lane(struct tegra_xusb_port *port,
416 			  const struct tegra_xusb_lane_map *map,
417 			  const char *function)
418 {
419 	struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV);
420 
421 	for (; map->type; map++) {
422 		if (port->index != map->port)
423 			continue;
424 
425 		lane = tegra_xusb_find_lane(port->padctl, map->type,
426 					    map->index);
427 		if (IS_ERR(lane))
428 			continue;
429 
430 		if (!tegra_xusb_lane_check(lane, function))
431 			continue;
432 
433 		if (!IS_ERR(match))
434 			dev_err(&port->dev, "conflicting match: %s-%u / %s\n",
435 				map->type, map->index, match->soc->name);
436 		else
437 			match = lane;
438 	}
439 
440 	return match;
441 }
442 
443 static struct device_node *
444 tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type,
445 			  unsigned int index)
446 {
447 	struct device_node *ports, *np;
448 	char *name;
449 
450 	ports = of_get_child_by_name(padctl->dev->of_node, "ports");
451 	if (!ports)
452 		return NULL;
453 
454 	name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
455 	if (!name) {
456 		of_node_put(ports);
457 		return ERR_PTR(-ENOMEM);
458 	}
459 	np = of_get_child_by_name(ports, name);
460 	kfree(name);
461 	of_node_put(ports);
462 
463 	return np;
464 }
465 
466 struct tegra_xusb_port *
467 tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type,
468 		     unsigned int index)
469 {
470 	struct tegra_xusb_port *port;
471 	struct device_node *np;
472 
473 	np = tegra_xusb_find_port_node(padctl, type, index);
474 	if (!np)
475 		return NULL;
476 
477 	list_for_each_entry(port, &padctl->ports, list) {
478 		if (np == port->dev.of_node) {
479 			of_node_put(np);
480 			return port;
481 		}
482 	}
483 
484 	of_node_put(np);
485 
486 	return NULL;
487 }
488 
489 struct tegra_xusb_usb2_port *
490 tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index)
491 {
492 	struct tegra_xusb_port *port;
493 
494 	port = tegra_xusb_find_port(padctl, "usb2", index);
495 	if (port)
496 		return to_usb2_port(port);
497 
498 	return NULL;
499 }
500 
501 struct tegra_xusb_usb3_port *
502 tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index)
503 {
504 	struct tegra_xusb_port *port;
505 
506 	port = tegra_xusb_find_port(padctl, "usb3", index);
507 	if (port)
508 		return to_usb3_port(port);
509 
510 	return NULL;
511 }
512 
513 static void tegra_xusb_port_release(struct device *dev)
514 {
515 }
516 
517 static struct device_type tegra_xusb_port_type = {
518 	.release = tegra_xusb_port_release,
519 };
520 
521 static int tegra_xusb_port_init(struct tegra_xusb_port *port,
522 				struct tegra_xusb_padctl *padctl,
523 				struct device_node *np,
524 				const char *name,
525 				unsigned int index)
526 {
527 	int err;
528 
529 	INIT_LIST_HEAD(&port->list);
530 	port->padctl = padctl;
531 	port->index = index;
532 
533 	device_initialize(&port->dev);
534 	port->dev.type = &tegra_xusb_port_type;
535 	port->dev.of_node = of_node_get(np);
536 	port->dev.parent = padctl->dev;
537 
538 	err = dev_set_name(&port->dev, "%s-%u", name, index);
539 	if (err < 0)
540 		goto unregister;
541 
542 	err = device_add(&port->dev);
543 	if (err < 0)
544 		goto unregister;
545 
546 	return 0;
547 
548 unregister:
549 	device_unregister(&port->dev);
550 	return err;
551 }
552 
553 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
554 {
555 	device_unregister(&port->dev);
556 }
557 
558 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
559 {
560 	struct tegra_xusb_port *port = &usb2->base;
561 	struct device_node *np = port->dev.of_node;
562 
563 	usb2->internal = of_property_read_bool(np, "nvidia,internal");
564 
565 	usb2->supply = devm_regulator_get(&port->dev, "vbus");
566 	return PTR_ERR_OR_ZERO(usb2->supply);
567 }
568 
569 static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl,
570 				    unsigned int index)
571 {
572 	struct tegra_xusb_usb2_port *usb2;
573 	struct device_node *np;
574 	int err = 0;
575 
576 	/*
577 	 * USB2 ports don't require additional properties, but if the port is
578 	 * marked as disabled there is no reason to register it.
579 	 */
580 	np = tegra_xusb_find_port_node(padctl, "usb2", index);
581 	if (!np || !of_device_is_available(np))
582 		goto out;
583 
584 	usb2 = devm_kzalloc(padctl->dev, sizeof(*usb2), GFP_KERNEL);
585 	if (!usb2) {
586 		err = -ENOMEM;
587 		goto out;
588 	}
589 
590 	err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index);
591 	if (err < 0)
592 		goto out;
593 
594 	usb2->base.ops = padctl->soc->ports.usb2.ops;
595 
596 	usb2->base.lane = usb2->base.ops->map(&usb2->base);
597 	if (IS_ERR(usb2->base.lane)) {
598 		err = PTR_ERR(usb2->base.lane);
599 		goto out;
600 	}
601 
602 	err = tegra_xusb_usb2_port_parse_dt(usb2);
603 	if (err < 0) {
604 		tegra_xusb_port_unregister(&usb2->base);
605 		goto out;
606 	}
607 
608 	list_add_tail(&usb2->base.list, &padctl->ports);
609 
610 out:
611 	of_node_put(np);
612 	return err;
613 }
614 
615 static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi)
616 {
617 	struct tegra_xusb_port *port = &ulpi->base;
618 	struct device_node *np = port->dev.of_node;
619 
620 	ulpi->internal = of_property_read_bool(np, "nvidia,internal");
621 
622 	return 0;
623 }
624 
625 static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl,
626 				    unsigned int index)
627 {
628 	struct tegra_xusb_ulpi_port *ulpi;
629 	struct device_node *np;
630 	int err = 0;
631 
632 	np = tegra_xusb_find_port_node(padctl, "ulpi", index);
633 	if (!np || !of_device_is_available(np))
634 		goto out;
635 
636 	ulpi = devm_kzalloc(padctl->dev, sizeof(*ulpi), GFP_KERNEL);
637 	if (!ulpi) {
638 		err = -ENOMEM;
639 		goto out;
640 	}
641 
642 	err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index);
643 	if (err < 0)
644 		goto out;
645 
646 	ulpi->base.ops = padctl->soc->ports.ulpi.ops;
647 
648 	ulpi->base.lane = ulpi->base.ops->map(&ulpi->base);
649 	if (IS_ERR(ulpi->base.lane)) {
650 		err = PTR_ERR(ulpi->base.lane);
651 		goto out;
652 	}
653 
654 	err = tegra_xusb_ulpi_port_parse_dt(ulpi);
655 	if (err < 0) {
656 		tegra_xusb_port_unregister(&ulpi->base);
657 		goto out;
658 	}
659 
660 	list_add_tail(&ulpi->base.list, &padctl->ports);
661 
662 out:
663 	of_node_put(np);
664 	return err;
665 }
666 
667 static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic)
668 {
669 	/* XXX */
670 	return 0;
671 }
672 
673 static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl,
674 				    unsigned int index)
675 {
676 	struct tegra_xusb_hsic_port *hsic;
677 	struct device_node *np;
678 	int err = 0;
679 
680 	np = tegra_xusb_find_port_node(padctl, "hsic", index);
681 	if (!np || !of_device_is_available(np))
682 		goto out;
683 
684 	hsic = devm_kzalloc(padctl->dev, sizeof(*hsic), GFP_KERNEL);
685 	if (!hsic) {
686 		err = -ENOMEM;
687 		goto out;
688 	}
689 
690 	err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index);
691 	if (err < 0)
692 		goto out;
693 
694 	hsic->base.ops = padctl->soc->ports.hsic.ops;
695 
696 	hsic->base.lane = hsic->base.ops->map(&hsic->base);
697 	if (IS_ERR(hsic->base.lane)) {
698 		err = PTR_ERR(hsic->base.lane);
699 		goto out;
700 	}
701 
702 	err = tegra_xusb_hsic_port_parse_dt(hsic);
703 	if (err < 0) {
704 		tegra_xusb_port_unregister(&hsic->base);
705 		goto out;
706 	}
707 
708 	list_add_tail(&hsic->base.list, &padctl->ports);
709 
710 out:
711 	of_node_put(np);
712 	return err;
713 }
714 
715 static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3)
716 {
717 	struct tegra_xusb_port *port = &usb3->base;
718 	struct device_node *np = port->dev.of_node;
719 	u32 value;
720 	int err;
721 
722 	err = of_property_read_u32(np, "nvidia,usb2-companion", &value);
723 	if (err < 0) {
724 		dev_err(&port->dev, "failed to read port: %d\n", err);
725 		return err;
726 	}
727 
728 	usb3->port = value;
729 
730 	usb3->internal = of_property_read_bool(np, "nvidia,internal");
731 
732 	usb3->supply = devm_regulator_get(&port->dev, "vbus");
733 	return PTR_ERR_OR_ZERO(usb3->supply);
734 }
735 
736 static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl,
737 				    unsigned int index)
738 {
739 	struct tegra_xusb_usb3_port *usb3;
740 	struct device_node *np;
741 	int err = 0;
742 
743 	/*
744 	 * If there is no supplemental configuration in the device tree the
745 	 * port is unusable. But it is valid to configure only a single port,
746 	 * hence return 0 instead of an error to allow ports to be optional.
747 	 */
748 	np = tegra_xusb_find_port_node(padctl, "usb3", index);
749 	if (!np || !of_device_is_available(np))
750 		goto out;
751 
752 	usb3 = devm_kzalloc(padctl->dev, sizeof(*usb3), GFP_KERNEL);
753 	if (!usb3) {
754 		err = -ENOMEM;
755 		goto out;
756 	}
757 
758 	err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index);
759 	if (err < 0)
760 		goto out;
761 
762 	usb3->base.ops = padctl->soc->ports.usb3.ops;
763 
764 	usb3->base.lane = usb3->base.ops->map(&usb3->base);
765 	if (IS_ERR(usb3->base.lane)) {
766 		err = PTR_ERR(usb3->base.lane);
767 		goto out;
768 	}
769 
770 	err = tegra_xusb_usb3_port_parse_dt(usb3);
771 	if (err < 0) {
772 		tegra_xusb_port_unregister(&usb3->base);
773 		goto out;
774 	}
775 
776 	list_add_tail(&usb3->base.list, &padctl->ports);
777 
778 out:
779 	of_node_put(np);
780 	return err;
781 }
782 
783 static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
784 {
785 	struct tegra_xusb_port *port, *tmp;
786 
787 	list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) {
788 		list_del(&port->list);
789 		tegra_xusb_port_unregister(port);
790 	}
791 }
792 
793 static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl)
794 {
795 	struct tegra_xusb_port *port;
796 	unsigned int i;
797 	int err = 0;
798 
799 	mutex_lock(&padctl->lock);
800 
801 	for (i = 0; i < padctl->soc->ports.usb2.count; i++) {
802 		err = tegra_xusb_add_usb2_port(padctl, i);
803 		if (err < 0)
804 			goto remove_ports;
805 	}
806 
807 	for (i = 0; i < padctl->soc->ports.ulpi.count; i++) {
808 		err = tegra_xusb_add_ulpi_port(padctl, i);
809 		if (err < 0)
810 			goto remove_ports;
811 	}
812 
813 	for (i = 0; i < padctl->soc->ports.hsic.count; i++) {
814 		err = tegra_xusb_add_hsic_port(padctl, i);
815 		if (err < 0)
816 			goto remove_ports;
817 	}
818 
819 	for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
820 		err = tegra_xusb_add_usb3_port(padctl, i);
821 		if (err < 0)
822 			goto remove_ports;
823 	}
824 
825 	list_for_each_entry(port, &padctl->ports, list) {
826 		err = port->ops->enable(port);
827 		if (err < 0)
828 			dev_err(padctl->dev, "failed to enable port %s: %d\n",
829 				dev_name(&port->dev), err);
830 	}
831 
832 	goto unlock;
833 
834 remove_ports:
835 	__tegra_xusb_remove_ports(padctl);
836 unlock:
837 	mutex_unlock(&padctl->lock);
838 	return err;
839 }
840 
841 static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
842 {
843 	mutex_lock(&padctl->lock);
844 	__tegra_xusb_remove_ports(padctl);
845 	mutex_unlock(&padctl->lock);
846 }
847 
848 static int tegra_xusb_padctl_probe(struct platform_device *pdev)
849 {
850 	struct device_node *np = pdev->dev.of_node;
851 	const struct tegra_xusb_padctl_soc *soc;
852 	struct tegra_xusb_padctl *padctl;
853 	const struct of_device_id *match;
854 	struct resource *res;
855 	int err;
856 
857 	/* for backwards compatibility with old device trees */
858 	np = of_get_child_by_name(np, "pads");
859 	if (!np) {
860 		dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n");
861 		return tegra_xusb_padctl_legacy_probe(pdev);
862 	}
863 
864 	of_node_put(np);
865 
866 	match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node);
867 	soc = match->data;
868 
869 	padctl = soc->ops->probe(&pdev->dev, soc);
870 	if (IS_ERR(padctl))
871 		return PTR_ERR(padctl);
872 
873 	platform_set_drvdata(pdev, padctl);
874 	INIT_LIST_HEAD(&padctl->ports);
875 	INIT_LIST_HEAD(&padctl->lanes);
876 	INIT_LIST_HEAD(&padctl->pads);
877 	mutex_init(&padctl->lock);
878 
879 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
880 	padctl->regs = devm_ioremap_resource(&pdev->dev, res);
881 	if (IS_ERR(padctl->regs)) {
882 		err = PTR_ERR(padctl->regs);
883 		goto remove;
884 	}
885 
886 	padctl->rst = devm_reset_control_get(&pdev->dev, NULL);
887 	if (IS_ERR(padctl->rst)) {
888 		err = PTR_ERR(padctl->rst);
889 		goto remove;
890 	}
891 
892 	err = reset_control_deassert(padctl->rst);
893 	if (err < 0)
894 		goto remove;
895 
896 	err = tegra_xusb_setup_pads(padctl);
897 	if (err < 0) {
898 		dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
899 		goto reset;
900 	}
901 
902 	err = tegra_xusb_setup_ports(padctl);
903 	if (err) {
904 		dev_err(&pdev->dev, "failed to setup XUSB ports: %d\n", err);
905 		goto remove_pads;
906 	}
907 
908 	return 0;
909 
910 remove_pads:
911 	tegra_xusb_remove_pads(padctl);
912 reset:
913 	reset_control_assert(padctl->rst);
914 remove:
915 	soc->ops->remove(padctl);
916 	return err;
917 }
918 
919 static int tegra_xusb_padctl_remove(struct platform_device *pdev)
920 {
921 	struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
922 	int err;
923 
924 	tegra_xusb_remove_ports(padctl);
925 	tegra_xusb_remove_pads(padctl);
926 
927 	err = reset_control_assert(padctl->rst);
928 	if (err < 0)
929 		dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
930 
931 	padctl->soc->ops->remove(padctl);
932 
933 	return err;
934 }
935 
936 static struct platform_driver tegra_xusb_padctl_driver = {
937 	.driver = {
938 		.name = "tegra-xusb-padctl",
939 		.of_match_table = tegra_xusb_padctl_of_match,
940 	},
941 	.probe = tegra_xusb_padctl_probe,
942 	.remove = tegra_xusb_padctl_remove,
943 };
944 module_platform_driver(tegra_xusb_padctl_driver);
945 
946 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev)
947 {
948 	struct tegra_xusb_padctl *padctl;
949 	struct platform_device *pdev;
950 	struct device_node *np;
951 
952 	np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0);
953 	if (!np)
954 		return ERR_PTR(-EINVAL);
955 
956 	/*
957 	 * This is slightly ugly. A better implementation would be to keep a
958 	 * registry of pad controllers, but since there will almost certainly
959 	 * only ever be one per SoC that would be a little overkill.
960 	 */
961 	pdev = of_find_device_by_node(np);
962 	if (!pdev) {
963 		of_node_put(np);
964 		return ERR_PTR(-ENODEV);
965 	}
966 
967 	of_node_put(np);
968 
969 	padctl = platform_get_drvdata(pdev);
970 	if (!padctl) {
971 		put_device(&pdev->dev);
972 		return ERR_PTR(-EPROBE_DEFER);
973 	}
974 
975 	return padctl;
976 }
977 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get);
978 
979 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl)
980 {
981 	if (padctl)
982 		put_device(padctl->dev);
983 }
984 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put);
985 
986 int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl,
987 					unsigned int port)
988 {
989 	if (padctl->soc->ops->usb3_save_context)
990 		return padctl->soc->ops->usb3_save_context(padctl, port);
991 
992 	return -ENOSYS;
993 }
994 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context);
995 
996 int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
997 				    unsigned int port, bool idle)
998 {
999 	if (padctl->soc->ops->hsic_set_idle)
1000 		return padctl->soc->ops->hsic_set_idle(padctl, port, idle);
1001 
1002 	return -ENOSYS;
1003 }
1004 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);
1005 
1006 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
1007 					   unsigned int port, bool enable)
1008 {
1009 	if (padctl->soc->ops->usb3_set_lfps_detect)
1010 		return padctl->soc->ops->usb3_set_lfps_detect(padctl, port,
1011 							      enable);
1012 
1013 	return -ENOSYS;
1014 }
1015 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);
1016 
1017 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
1018 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
1019 MODULE_LICENSE("GPL v2");
1020