xref: /openbmc/linux/drivers/phy/tegra/xusb.c (revision 9fb29c73) 
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 int tegra_xusb_lane_parse_dt(struct tegra_xusb_lane *lane,
106 			     struct device_node *np)
107 {
108 	struct device *dev = &lane->pad->dev;
109 	const char *function;
110 	int err;
111 
112 	err = of_property_read_string(np, "nvidia,function", &function);
113 	if (err < 0)
114 		return err;
115 
116 	err = match_string(lane->soc->funcs, lane->soc->num_funcs, function);
117 	if (err < 0) {
118 		dev_err(dev, "invalid function \"%s\" for lane \"%pOFn\"\n",
119 			function, np);
120 		return err;
121 	}
122 
123 	lane->function = err;
124 
125 	return 0;
126 }
127 
128 static void tegra_xusb_lane_destroy(struct phy *phy)
129 {
130 	if (phy) {
131 		struct tegra_xusb_lane *lane = phy_get_drvdata(phy);
132 
133 		lane->pad->ops->remove(lane);
134 		phy_destroy(phy);
135 	}
136 }
137 
138 static void tegra_xusb_pad_release(struct device *dev)
139 {
140 	struct tegra_xusb_pad *pad = to_tegra_xusb_pad(dev);
141 
142 	pad->soc->ops->remove(pad);
143 }
144 
145 static struct device_type tegra_xusb_pad_type = {
146 	.release = tegra_xusb_pad_release,
147 };
148 
149 int tegra_xusb_pad_init(struct tegra_xusb_pad *pad,
150 			struct tegra_xusb_padctl *padctl,
151 			struct device_node *np)
152 {
153 	int err;
154 
155 	device_initialize(&pad->dev);
156 	INIT_LIST_HEAD(&pad->list);
157 	pad->dev.parent = padctl->dev;
158 	pad->dev.type = &tegra_xusb_pad_type;
159 	pad->dev.of_node = np;
160 	pad->padctl = padctl;
161 
162 	err = dev_set_name(&pad->dev, "%s", pad->soc->name);
163 	if (err < 0)
164 		goto unregister;
165 
166 	err = device_add(&pad->dev);
167 	if (err < 0)
168 		goto unregister;
169 
170 	return 0;
171 
172 unregister:
173 	device_unregister(&pad->dev);
174 	return err;
175 }
176 
177 int tegra_xusb_pad_register(struct tegra_xusb_pad *pad,
178 			    const struct phy_ops *ops)
179 {
180 	struct device_node *children;
181 	struct phy *lane;
182 	unsigned int i;
183 	int err;
184 
185 	children = of_get_child_by_name(pad->dev.of_node, "lanes");
186 	if (!children)
187 		return -ENODEV;
188 
189 	pad->lanes = devm_kcalloc(&pad->dev, pad->soc->num_lanes, sizeof(lane),
190 				  GFP_KERNEL);
191 	if (!pad->lanes) {
192 		of_node_put(children);
193 		return -ENOMEM;
194 	}
195 
196 	for (i = 0; i < pad->soc->num_lanes; i++) {
197 		struct device_node *np = tegra_xusb_pad_find_phy_node(pad, i);
198 		struct tegra_xusb_lane *lane;
199 
200 		/* skip disabled lanes */
201 		if (!np || !of_device_is_available(np)) {
202 			of_node_put(np);
203 			continue;
204 		}
205 
206 		pad->lanes[i] = phy_create(&pad->dev, np, ops);
207 		if (IS_ERR(pad->lanes[i])) {
208 			err = PTR_ERR(pad->lanes[i]);
209 			of_node_put(np);
210 			goto remove;
211 		}
212 
213 		lane = pad->ops->probe(pad, np, i);
214 		if (IS_ERR(lane)) {
215 			phy_destroy(pad->lanes[i]);
216 			err = PTR_ERR(lane);
217 			goto remove;
218 		}
219 
220 		list_add_tail(&lane->list, &pad->padctl->lanes);
221 		phy_set_drvdata(pad->lanes[i], lane);
222 	}
223 
224 	pad->provider = of_phy_provider_register_full(&pad->dev, children,
225 						      tegra_xusb_pad_of_xlate);
226 	if (IS_ERR(pad->provider)) {
227 		err = PTR_ERR(pad->provider);
228 		goto remove;
229 	}
230 
231 	return 0;
232 
233 remove:
234 	while (i--)
235 		tegra_xusb_lane_destroy(pad->lanes[i]);
236 
237 	of_node_put(children);
238 
239 	return err;
240 }
241 
242 void tegra_xusb_pad_unregister(struct tegra_xusb_pad *pad)
243 {
244 	unsigned int i = pad->soc->num_lanes;
245 
246 	of_phy_provider_unregister(pad->provider);
247 
248 	while (i--)
249 		tegra_xusb_lane_destroy(pad->lanes[i]);
250 
251 	device_unregister(&pad->dev);
252 }
253 
254 static struct tegra_xusb_pad *
255 tegra_xusb_pad_create(struct tegra_xusb_padctl *padctl,
256 		      const struct tegra_xusb_pad_soc *soc)
257 {
258 	struct tegra_xusb_pad *pad;
259 	struct device_node *np;
260 	int err;
261 
262 	np = tegra_xusb_find_pad_node(padctl, soc->name);
263 	if (!np || !of_device_is_available(np))
264 		return NULL;
265 
266 	pad = soc->ops->probe(padctl, soc, np);
267 	if (IS_ERR(pad)) {
268 		err = PTR_ERR(pad);
269 		dev_err(padctl->dev, "failed to create pad %s: %d\n",
270 			soc->name, err);
271 		return ERR_PTR(err);
272 	}
273 
274 	/* XXX move this into ->probe() to avoid string comparison */
275 	if (strcmp(soc->name, "pcie") == 0)
276 		padctl->pcie = pad;
277 
278 	if (strcmp(soc->name, "sata") == 0)
279 		padctl->sata = pad;
280 
281 	if (strcmp(soc->name, "usb2") == 0)
282 		padctl->usb2 = pad;
283 
284 	if (strcmp(soc->name, "ulpi") == 0)
285 		padctl->ulpi = pad;
286 
287 	if (strcmp(soc->name, "hsic") == 0)
288 		padctl->hsic = pad;
289 
290 	return pad;
291 }
292 
293 static void __tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
294 {
295 	struct tegra_xusb_pad *pad, *tmp;
296 
297 	list_for_each_entry_safe_reverse(pad, tmp, &padctl->pads, list) {
298 		list_del(&pad->list);
299 		tegra_xusb_pad_unregister(pad);
300 	}
301 }
302 
303 static void tegra_xusb_remove_pads(struct tegra_xusb_padctl *padctl)
304 {
305 	mutex_lock(&padctl->lock);
306 	__tegra_xusb_remove_pads(padctl);
307 	mutex_unlock(&padctl->lock);
308 }
309 
310 static void tegra_xusb_lane_program(struct tegra_xusb_lane *lane)
311 {
312 	struct tegra_xusb_padctl *padctl = lane->pad->padctl;
313 	const struct tegra_xusb_lane_soc *soc = lane->soc;
314 	u32 value;
315 
316 	/* choose function */
317 	value = padctl_readl(padctl, soc->offset);
318 	value &= ~(soc->mask << soc->shift);
319 	value |= lane->function << soc->shift;
320 	padctl_writel(padctl, value, soc->offset);
321 }
322 
323 static void tegra_xusb_pad_program(struct tegra_xusb_pad *pad)
324 {
325 	unsigned int i;
326 
327 	for (i = 0; i < pad->soc->num_lanes; i++) {
328 		struct tegra_xusb_lane *lane;
329 
330 		if (pad->lanes[i]) {
331 			lane = phy_get_drvdata(pad->lanes[i]);
332 			tegra_xusb_lane_program(lane);
333 		}
334 	}
335 }
336 
337 static int tegra_xusb_setup_pads(struct tegra_xusb_padctl *padctl)
338 {
339 	struct tegra_xusb_pad *pad;
340 	unsigned int i;
341 
342 	mutex_lock(&padctl->lock);
343 
344 	for (i = 0; i < padctl->soc->num_pads; i++) {
345 		const struct tegra_xusb_pad_soc *soc = padctl->soc->pads[i];
346 		int err;
347 
348 		pad = tegra_xusb_pad_create(padctl, soc);
349 		if (IS_ERR(pad)) {
350 			err = PTR_ERR(pad);
351 			dev_err(padctl->dev, "failed to create pad %s: %d\n",
352 				soc->name, err);
353 			__tegra_xusb_remove_pads(padctl);
354 			mutex_unlock(&padctl->lock);
355 			return err;
356 		}
357 
358 		if (!pad)
359 			continue;
360 
361 		list_add_tail(&pad->list, &padctl->pads);
362 	}
363 
364 	list_for_each_entry(pad, &padctl->pads, list)
365 		tegra_xusb_pad_program(pad);
366 
367 	mutex_unlock(&padctl->lock);
368 	return 0;
369 }
370 
371 static bool tegra_xusb_lane_check(struct tegra_xusb_lane *lane,
372 				  const char *function)
373 {
374 	const char *func = lane->soc->funcs[lane->function];
375 
376 	return strcmp(function, func) == 0;
377 }
378 
379 struct tegra_xusb_lane *tegra_xusb_find_lane(struct tegra_xusb_padctl *padctl,
380 					     const char *type,
381 					     unsigned int index)
382 {
383 	struct tegra_xusb_lane *lane, *hit = ERR_PTR(-ENODEV);
384 	char *name;
385 
386 	name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
387 	if (!name)
388 		return ERR_PTR(-ENOMEM);
389 
390 	list_for_each_entry(lane, &padctl->lanes, list) {
391 		if (strcmp(lane->soc->name, name) == 0) {
392 			hit = lane;
393 			break;
394 		}
395 	}
396 
397 	kfree(name);
398 	return hit;
399 }
400 
401 struct tegra_xusb_lane *
402 tegra_xusb_port_find_lane(struct tegra_xusb_port *port,
403 			  const struct tegra_xusb_lane_map *map,
404 			  const char *function)
405 {
406 	struct tegra_xusb_lane *lane, *match = ERR_PTR(-ENODEV);
407 
408 	for (; map->type; map++) {
409 		if (port->index != map->port)
410 			continue;
411 
412 		lane = tegra_xusb_find_lane(port->padctl, map->type,
413 					    map->index);
414 		if (IS_ERR(lane))
415 			continue;
416 
417 		if (!tegra_xusb_lane_check(lane, function))
418 			continue;
419 
420 		if (!IS_ERR(match))
421 			dev_err(&port->dev, "conflicting match: %s-%u / %s\n",
422 				map->type, map->index, match->soc->name);
423 		else
424 			match = lane;
425 	}
426 
427 	return match;
428 }
429 
430 static struct device_node *
431 tegra_xusb_find_port_node(struct tegra_xusb_padctl *padctl, const char *type,
432 			  unsigned int index)
433 {
434 	struct device_node *ports, *np;
435 	char *name;
436 
437 	ports = of_get_child_by_name(padctl->dev->of_node, "ports");
438 	if (!ports)
439 		return NULL;
440 
441 	name = kasprintf(GFP_KERNEL, "%s-%u", type, index);
442 	if (!name) {
443 		of_node_put(ports);
444 		return ERR_PTR(-ENOMEM);
445 	}
446 	np = of_get_child_by_name(ports, name);
447 	kfree(name);
448 	of_node_put(ports);
449 
450 	return np;
451 }
452 
453 struct tegra_xusb_port *
454 tegra_xusb_find_port(struct tegra_xusb_padctl *padctl, const char *type,
455 		     unsigned int index)
456 {
457 	struct tegra_xusb_port *port;
458 	struct device_node *np;
459 
460 	np = tegra_xusb_find_port_node(padctl, type, index);
461 	if (!np)
462 		return NULL;
463 
464 	list_for_each_entry(port, &padctl->ports, list) {
465 		if (np == port->dev.of_node) {
466 			of_node_put(np);
467 			return port;
468 		}
469 	}
470 
471 	of_node_put(np);
472 
473 	return NULL;
474 }
475 
476 struct tegra_xusb_usb2_port *
477 tegra_xusb_find_usb2_port(struct tegra_xusb_padctl *padctl, unsigned int index)
478 {
479 	struct tegra_xusb_port *port;
480 
481 	port = tegra_xusb_find_port(padctl, "usb2", index);
482 	if (port)
483 		return to_usb2_port(port);
484 
485 	return NULL;
486 }
487 
488 struct tegra_xusb_usb3_port *
489 tegra_xusb_find_usb3_port(struct tegra_xusb_padctl *padctl, unsigned int index)
490 {
491 	struct tegra_xusb_port *port;
492 
493 	port = tegra_xusb_find_port(padctl, "usb3", index);
494 	if (port)
495 		return to_usb3_port(port);
496 
497 	return NULL;
498 }
499 
500 static void tegra_xusb_port_release(struct device *dev)
501 {
502 }
503 
504 static struct device_type tegra_xusb_port_type = {
505 	.release = tegra_xusb_port_release,
506 };
507 
508 static int tegra_xusb_port_init(struct tegra_xusb_port *port,
509 				struct tegra_xusb_padctl *padctl,
510 				struct device_node *np,
511 				const char *name,
512 				unsigned int index)
513 {
514 	int err;
515 
516 	INIT_LIST_HEAD(&port->list);
517 	port->padctl = padctl;
518 	port->index = index;
519 
520 	device_initialize(&port->dev);
521 	port->dev.type = &tegra_xusb_port_type;
522 	port->dev.of_node = of_node_get(np);
523 	port->dev.parent = padctl->dev;
524 
525 	err = dev_set_name(&port->dev, "%s-%u", name, index);
526 	if (err < 0)
527 		goto unregister;
528 
529 	err = device_add(&port->dev);
530 	if (err < 0)
531 		goto unregister;
532 
533 	return 0;
534 
535 unregister:
536 	device_unregister(&port->dev);
537 	return err;
538 }
539 
540 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
541 {
542 	device_unregister(&port->dev);
543 }
544 
545 static int tegra_xusb_usb2_port_parse_dt(struct tegra_xusb_usb2_port *usb2)
546 {
547 	struct tegra_xusb_port *port = &usb2->base;
548 	struct device_node *np = port->dev.of_node;
549 
550 	usb2->internal = of_property_read_bool(np, "nvidia,internal");
551 
552 	usb2->supply = devm_regulator_get(&port->dev, "vbus");
553 	return PTR_ERR_OR_ZERO(usb2->supply);
554 }
555 
556 static int tegra_xusb_add_usb2_port(struct tegra_xusb_padctl *padctl,
557 				    unsigned int index)
558 {
559 	struct tegra_xusb_usb2_port *usb2;
560 	struct device_node *np;
561 	int err = 0;
562 
563 	/*
564 	 * USB2 ports don't require additional properties, but if the port is
565 	 * marked as disabled there is no reason to register it.
566 	 */
567 	np = tegra_xusb_find_port_node(padctl, "usb2", index);
568 	if (!np || !of_device_is_available(np))
569 		goto out;
570 
571 	usb2 = devm_kzalloc(padctl->dev, sizeof(*usb2), GFP_KERNEL);
572 	if (!usb2) {
573 		err = -ENOMEM;
574 		goto out;
575 	}
576 
577 	err = tegra_xusb_port_init(&usb2->base, padctl, np, "usb2", index);
578 	if (err < 0)
579 		goto out;
580 
581 	usb2->base.ops = padctl->soc->ports.usb2.ops;
582 
583 	usb2->base.lane = usb2->base.ops->map(&usb2->base);
584 	if (IS_ERR(usb2->base.lane)) {
585 		err = PTR_ERR(usb2->base.lane);
586 		goto out;
587 	}
588 
589 	err = tegra_xusb_usb2_port_parse_dt(usb2);
590 	if (err < 0) {
591 		tegra_xusb_port_unregister(&usb2->base);
592 		goto out;
593 	}
594 
595 	list_add_tail(&usb2->base.list, &padctl->ports);
596 
597 out:
598 	of_node_put(np);
599 	return err;
600 }
601 
602 static int tegra_xusb_ulpi_port_parse_dt(struct tegra_xusb_ulpi_port *ulpi)
603 {
604 	struct tegra_xusb_port *port = &ulpi->base;
605 	struct device_node *np = port->dev.of_node;
606 
607 	ulpi->internal = of_property_read_bool(np, "nvidia,internal");
608 
609 	return 0;
610 }
611 
612 static int tegra_xusb_add_ulpi_port(struct tegra_xusb_padctl *padctl,
613 				    unsigned int index)
614 {
615 	struct tegra_xusb_ulpi_port *ulpi;
616 	struct device_node *np;
617 	int err = 0;
618 
619 	np = tegra_xusb_find_port_node(padctl, "ulpi", index);
620 	if (!np || !of_device_is_available(np))
621 		goto out;
622 
623 	ulpi = devm_kzalloc(padctl->dev, sizeof(*ulpi), GFP_KERNEL);
624 	if (!ulpi) {
625 		err = -ENOMEM;
626 		goto out;
627 	}
628 
629 	err = tegra_xusb_port_init(&ulpi->base, padctl, np, "ulpi", index);
630 	if (err < 0)
631 		goto out;
632 
633 	ulpi->base.ops = padctl->soc->ports.ulpi.ops;
634 
635 	ulpi->base.lane = ulpi->base.ops->map(&ulpi->base);
636 	if (IS_ERR(ulpi->base.lane)) {
637 		err = PTR_ERR(ulpi->base.lane);
638 		goto out;
639 	}
640 
641 	err = tegra_xusb_ulpi_port_parse_dt(ulpi);
642 	if (err < 0) {
643 		tegra_xusb_port_unregister(&ulpi->base);
644 		goto out;
645 	}
646 
647 	list_add_tail(&ulpi->base.list, &padctl->ports);
648 
649 out:
650 	of_node_put(np);
651 	return err;
652 }
653 
654 static int tegra_xusb_hsic_port_parse_dt(struct tegra_xusb_hsic_port *hsic)
655 {
656 	/* XXX */
657 	return 0;
658 }
659 
660 static int tegra_xusb_add_hsic_port(struct tegra_xusb_padctl *padctl,
661 				    unsigned int index)
662 {
663 	struct tegra_xusb_hsic_port *hsic;
664 	struct device_node *np;
665 	int err = 0;
666 
667 	np = tegra_xusb_find_port_node(padctl, "hsic", index);
668 	if (!np || !of_device_is_available(np))
669 		goto out;
670 
671 	hsic = devm_kzalloc(padctl->dev, sizeof(*hsic), GFP_KERNEL);
672 	if (!hsic) {
673 		err = -ENOMEM;
674 		goto out;
675 	}
676 
677 	err = tegra_xusb_port_init(&hsic->base, padctl, np, "hsic", index);
678 	if (err < 0)
679 		goto out;
680 
681 	hsic->base.ops = padctl->soc->ports.hsic.ops;
682 
683 	hsic->base.lane = hsic->base.ops->map(&hsic->base);
684 	if (IS_ERR(hsic->base.lane)) {
685 		err = PTR_ERR(hsic->base.lane);
686 		goto out;
687 	}
688 
689 	err = tegra_xusb_hsic_port_parse_dt(hsic);
690 	if (err < 0) {
691 		tegra_xusb_port_unregister(&hsic->base);
692 		goto out;
693 	}
694 
695 	list_add_tail(&hsic->base.list, &padctl->ports);
696 
697 out:
698 	of_node_put(np);
699 	return err;
700 }
701 
702 static int tegra_xusb_usb3_port_parse_dt(struct tegra_xusb_usb3_port *usb3)
703 {
704 	struct tegra_xusb_port *port = &usb3->base;
705 	struct device_node *np = port->dev.of_node;
706 	u32 value;
707 	int err;
708 
709 	err = of_property_read_u32(np, "nvidia,usb2-companion", &value);
710 	if (err < 0) {
711 		dev_err(&port->dev, "failed to read port: %d\n", err);
712 		return err;
713 	}
714 
715 	usb3->port = value;
716 
717 	usb3->internal = of_property_read_bool(np, "nvidia,internal");
718 
719 	usb3->supply = devm_regulator_get(&port->dev, "vbus");
720 	return PTR_ERR_OR_ZERO(usb3->supply);
721 }
722 
723 static int tegra_xusb_add_usb3_port(struct tegra_xusb_padctl *padctl,
724 				    unsigned int index)
725 {
726 	struct tegra_xusb_usb3_port *usb3;
727 	struct device_node *np;
728 	int err = 0;
729 
730 	/*
731 	 * If there is no supplemental configuration in the device tree the
732 	 * port is unusable. But it is valid to configure only a single port,
733 	 * hence return 0 instead of an error to allow ports to be optional.
734 	 */
735 	np = tegra_xusb_find_port_node(padctl, "usb3", index);
736 	if (!np || !of_device_is_available(np))
737 		goto out;
738 
739 	usb3 = devm_kzalloc(padctl->dev, sizeof(*usb3), GFP_KERNEL);
740 	if (!usb3) {
741 		err = -ENOMEM;
742 		goto out;
743 	}
744 
745 	err = tegra_xusb_port_init(&usb3->base, padctl, np, "usb3", index);
746 	if (err < 0)
747 		goto out;
748 
749 	usb3->base.ops = padctl->soc->ports.usb3.ops;
750 
751 	usb3->base.lane = usb3->base.ops->map(&usb3->base);
752 	if (IS_ERR(usb3->base.lane)) {
753 		err = PTR_ERR(usb3->base.lane);
754 		goto out;
755 	}
756 
757 	err = tegra_xusb_usb3_port_parse_dt(usb3);
758 	if (err < 0) {
759 		tegra_xusb_port_unregister(&usb3->base);
760 		goto out;
761 	}
762 
763 	list_add_tail(&usb3->base.list, &padctl->ports);
764 
765 out:
766 	of_node_put(np);
767 	return err;
768 }
769 
770 static void __tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
771 {
772 	struct tegra_xusb_port *port, *tmp;
773 
774 	list_for_each_entry_safe_reverse(port, tmp, &padctl->ports, list) {
775 		list_del(&port->list);
776 		tegra_xusb_port_unregister(port);
777 	}
778 }
779 
780 static int tegra_xusb_setup_ports(struct tegra_xusb_padctl *padctl)
781 {
782 	struct tegra_xusb_port *port;
783 	unsigned int i;
784 	int err = 0;
785 
786 	mutex_lock(&padctl->lock);
787 
788 	for (i = 0; i < padctl->soc->ports.usb2.count; i++) {
789 		err = tegra_xusb_add_usb2_port(padctl, i);
790 		if (err < 0)
791 			goto remove_ports;
792 	}
793 
794 	for (i = 0; i < padctl->soc->ports.ulpi.count; i++) {
795 		err = tegra_xusb_add_ulpi_port(padctl, i);
796 		if (err < 0)
797 			goto remove_ports;
798 	}
799 
800 	for (i = 0; i < padctl->soc->ports.hsic.count; i++) {
801 		err = tegra_xusb_add_hsic_port(padctl, i);
802 		if (err < 0)
803 			goto remove_ports;
804 	}
805 
806 	for (i = 0; i < padctl->soc->ports.usb3.count; i++) {
807 		err = tegra_xusb_add_usb3_port(padctl, i);
808 		if (err < 0)
809 			goto remove_ports;
810 	}
811 
812 	list_for_each_entry(port, &padctl->ports, list) {
813 		err = port->ops->enable(port);
814 		if (err < 0)
815 			dev_err(padctl->dev, "failed to enable port %s: %d\n",
816 				dev_name(&port->dev), err);
817 	}
818 
819 	goto unlock;
820 
821 remove_ports:
822 	__tegra_xusb_remove_ports(padctl);
823 unlock:
824 	mutex_unlock(&padctl->lock);
825 	return err;
826 }
827 
828 static void tegra_xusb_remove_ports(struct tegra_xusb_padctl *padctl)
829 {
830 	mutex_lock(&padctl->lock);
831 	__tegra_xusb_remove_ports(padctl);
832 	mutex_unlock(&padctl->lock);
833 }
834 
835 static int tegra_xusb_padctl_probe(struct platform_device *pdev)
836 {
837 	struct device_node *np = pdev->dev.of_node;
838 	const struct tegra_xusb_padctl_soc *soc;
839 	struct tegra_xusb_padctl *padctl;
840 	const struct of_device_id *match;
841 	struct resource *res;
842 	int err;
843 
844 	/* for backwards compatibility with old device trees */
845 	np = of_get_child_by_name(np, "pads");
846 	if (!np) {
847 		dev_warn(&pdev->dev, "deprecated DT, using legacy driver\n");
848 		return tegra_xusb_padctl_legacy_probe(pdev);
849 	}
850 
851 	of_node_put(np);
852 
853 	match = of_match_node(tegra_xusb_padctl_of_match, pdev->dev.of_node);
854 	soc = match->data;
855 
856 	padctl = soc->ops->probe(&pdev->dev, soc);
857 	if (IS_ERR(padctl))
858 		return PTR_ERR(padctl);
859 
860 	platform_set_drvdata(pdev, padctl);
861 	INIT_LIST_HEAD(&padctl->ports);
862 	INIT_LIST_HEAD(&padctl->lanes);
863 	INIT_LIST_HEAD(&padctl->pads);
864 	mutex_init(&padctl->lock);
865 
866 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
867 	padctl->regs = devm_ioremap_resource(&pdev->dev, res);
868 	if (IS_ERR(padctl->regs)) {
869 		err = PTR_ERR(padctl->regs);
870 		goto remove;
871 	}
872 
873 	padctl->rst = devm_reset_control_get(&pdev->dev, NULL);
874 	if (IS_ERR(padctl->rst)) {
875 		err = PTR_ERR(padctl->rst);
876 		goto remove;
877 	}
878 
879 	err = reset_control_deassert(padctl->rst);
880 	if (err < 0)
881 		goto remove;
882 
883 	err = tegra_xusb_setup_pads(padctl);
884 	if (err < 0) {
885 		dev_err(&pdev->dev, "failed to setup pads: %d\n", err);
886 		goto reset;
887 	}
888 
889 	err = tegra_xusb_setup_ports(padctl);
890 	if (err) {
891 		dev_err(&pdev->dev, "failed to setup XUSB ports: %d\n", err);
892 		goto remove_pads;
893 	}
894 
895 	return 0;
896 
897 remove_pads:
898 	tegra_xusb_remove_pads(padctl);
899 reset:
900 	reset_control_assert(padctl->rst);
901 remove:
902 	soc->ops->remove(padctl);
903 	return err;
904 }
905 
906 static int tegra_xusb_padctl_remove(struct platform_device *pdev)
907 {
908 	struct tegra_xusb_padctl *padctl = platform_get_drvdata(pdev);
909 	int err;
910 
911 	tegra_xusb_remove_ports(padctl);
912 	tegra_xusb_remove_pads(padctl);
913 
914 	err = reset_control_assert(padctl->rst);
915 	if (err < 0)
916 		dev_err(&pdev->dev, "failed to assert reset: %d\n", err);
917 
918 	padctl->soc->ops->remove(padctl);
919 
920 	return err;
921 }
922 
923 static struct platform_driver tegra_xusb_padctl_driver = {
924 	.driver = {
925 		.name = "tegra-xusb-padctl",
926 		.of_match_table = tegra_xusb_padctl_of_match,
927 	},
928 	.probe = tegra_xusb_padctl_probe,
929 	.remove = tegra_xusb_padctl_remove,
930 };
931 module_platform_driver(tegra_xusb_padctl_driver);
932 
933 struct tegra_xusb_padctl *tegra_xusb_padctl_get(struct device *dev)
934 {
935 	struct tegra_xusb_padctl *padctl;
936 	struct platform_device *pdev;
937 	struct device_node *np;
938 
939 	np = of_parse_phandle(dev->of_node, "nvidia,xusb-padctl", 0);
940 	if (!np)
941 		return ERR_PTR(-EINVAL);
942 
943 	/*
944 	 * This is slightly ugly. A better implementation would be to keep a
945 	 * registry of pad controllers, but since there will almost certainly
946 	 * only ever be one per SoC that would be a little overkill.
947 	 */
948 	pdev = of_find_device_by_node(np);
949 	if (!pdev) {
950 		of_node_put(np);
951 		return ERR_PTR(-ENODEV);
952 	}
953 
954 	of_node_put(np);
955 
956 	padctl = platform_get_drvdata(pdev);
957 	if (!padctl) {
958 		put_device(&pdev->dev);
959 		return ERR_PTR(-EPROBE_DEFER);
960 	}
961 
962 	return padctl;
963 }
964 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_get);
965 
966 void tegra_xusb_padctl_put(struct tegra_xusb_padctl *padctl)
967 {
968 	if (padctl)
969 		put_device(padctl->dev);
970 }
971 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_put);
972 
973 int tegra_xusb_padctl_usb3_save_context(struct tegra_xusb_padctl *padctl,
974 					unsigned int port)
975 {
976 	if (padctl->soc->ops->usb3_save_context)
977 		return padctl->soc->ops->usb3_save_context(padctl, port);
978 
979 	return -ENOSYS;
980 }
981 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_save_context);
982 
983 int tegra_xusb_padctl_hsic_set_idle(struct tegra_xusb_padctl *padctl,
984 				    unsigned int port, bool idle)
985 {
986 	if (padctl->soc->ops->hsic_set_idle)
987 		return padctl->soc->ops->hsic_set_idle(padctl, port, idle);
988 
989 	return -ENOSYS;
990 }
991 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_hsic_set_idle);
992 
993 int tegra_xusb_padctl_usb3_set_lfps_detect(struct tegra_xusb_padctl *padctl,
994 					   unsigned int port, bool enable)
995 {
996 	if (padctl->soc->ops->usb3_set_lfps_detect)
997 		return padctl->soc->ops->usb3_set_lfps_detect(padctl, port,
998 							      enable);
999 
1000 	return -ENOSYS;
1001 }
1002 EXPORT_SYMBOL_GPL(tegra_xusb_padctl_usb3_set_lfps_detect);
1003 
1004 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
1005 MODULE_DESCRIPTION("Tegra XUSB Pad Controller driver");
1006 MODULE_LICENSE("GPL v2");
1007