1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Renesas R-Car Gen3 for USB2.0 PHY driver
4  *
5  * Copyright (C) 2015-2017 Renesas Electronics Corporation
6  *
7  * This is based on the phy-rcar-gen2 driver:
8  * Copyright (C) 2014 Renesas Solutions Corp.
9  * Copyright (C) 2014 Cogent Embedded, Inc.
10  */
11 
12 #include <linux/extcon-provider.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/module.h>
16 #include <linux/mutex.h>
17 #include <linux/of.h>
18 #include <linux/of_address.h>
19 #include <linux/of_device.h>
20 #include <linux/phy/phy.h>
21 #include <linux/platform_device.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/regulator/consumer.h>
24 #include <linux/string.h>
25 #include <linux/usb/of.h>
26 #include <linux/workqueue.h>
27 
28 /******* USB2.0 Host registers (original offset is +0x200) *******/
29 #define USB2_INT_ENABLE		0x000
30 #define USB2_USBCTR		0x00c
31 #define USB2_SPD_RSM_TIMSET	0x10c
32 #define USB2_OC_TIMSET		0x110
33 #define USB2_COMMCTRL		0x600
34 #define USB2_OBINTSTA		0x604
35 #define USB2_OBINTEN		0x608
36 #define USB2_VBCTRL		0x60c
37 #define USB2_LINECTRL1		0x610
38 #define USB2_ADPCTRL		0x630
39 
40 /* INT_ENABLE */
41 #define USB2_INT_ENABLE_UCOM_INTEN	BIT(3)
42 #define USB2_INT_ENABLE_USBH_INTB_EN	BIT(2)	/* For EHCI */
43 #define USB2_INT_ENABLE_USBH_INTA_EN	BIT(1)	/* For OHCI */
44 
45 /* USBCTR */
46 #define USB2_USBCTR_DIRPD	BIT(2)
47 #define USB2_USBCTR_PLL_RST	BIT(1)
48 
49 /* SPD_RSM_TIMSET */
50 #define USB2_SPD_RSM_TIMSET_INIT	0x014e029b
51 
52 /* OC_TIMSET */
53 #define USB2_OC_TIMSET_INIT		0x000209ab
54 
55 /* COMMCTRL */
56 #define USB2_COMMCTRL_OTG_PERI		BIT(31)	/* 1 = Peripheral mode */
57 
58 /* OBINTSTA and OBINTEN */
59 #define USB2_OBINT_SESSVLDCHG		BIT(12)
60 #define USB2_OBINT_IDDIGCHG		BIT(11)
61 #define USB2_OBINT_BITS			(USB2_OBINT_SESSVLDCHG | \
62 					 USB2_OBINT_IDDIGCHG)
63 
64 /* VBCTRL */
65 #define USB2_VBCTRL_OCCLREN		BIT(16)
66 #define USB2_VBCTRL_DRVVBUSSEL		BIT(8)
67 
68 /* LINECTRL1 */
69 #define USB2_LINECTRL1_DPRPD_EN		BIT(19)
70 #define USB2_LINECTRL1_DP_RPD		BIT(18)
71 #define USB2_LINECTRL1_DMRPD_EN		BIT(17)
72 #define USB2_LINECTRL1_DM_RPD		BIT(16)
73 #define USB2_LINECTRL1_OPMODE_NODRV	BIT(6)
74 
75 /* ADPCTRL */
76 #define USB2_ADPCTRL_OTGSESSVLD		BIT(20)
77 #define USB2_ADPCTRL_IDDIG		BIT(19)
78 #define USB2_ADPCTRL_IDPULLUP		BIT(5)	/* 1 = ID sampling is enabled */
79 #define USB2_ADPCTRL_DRVVBUS		BIT(4)
80 
81 #define NUM_OF_PHYS			4
82 enum rcar_gen3_phy_index {
83 	PHY_INDEX_BOTH_HC,
84 	PHY_INDEX_OHCI,
85 	PHY_INDEX_EHCI,
86 	PHY_INDEX_HSUSB
87 };
88 
89 static const u32 rcar_gen3_int_enable[NUM_OF_PHYS] = {
90 	USB2_INT_ENABLE_USBH_INTB_EN | USB2_INT_ENABLE_USBH_INTA_EN,
91 	USB2_INT_ENABLE_USBH_INTA_EN,
92 	USB2_INT_ENABLE_USBH_INTB_EN,
93 	0
94 };
95 
96 struct rcar_gen3_phy {
97 	struct phy *phy;
98 	struct rcar_gen3_chan *ch;
99 	u32 int_enable_bits;
100 	bool initialized;
101 	bool otg_initialized;
102 	bool powered;
103 };
104 
105 struct rcar_gen3_chan {
106 	void __iomem *base;
107 	struct device *dev;	/* platform_device's device */
108 	struct extcon_dev *extcon;
109 	struct rcar_gen3_phy rphys[NUM_OF_PHYS];
110 	struct regulator *vbus;
111 	struct work_struct work;
112 	struct mutex lock;	/* protects rphys[...].powered */
113 	enum usb_dr_mode dr_mode;
114 	int irq;
115 	bool extcon_host;
116 	bool is_otg_channel;
117 	bool uses_otg_pins;
118 };
119 
120 /*
121  * Combination about is_otg_channel and uses_otg_pins:
122  *
123  * Parameters				|| Behaviors
124  * is_otg_channel	| uses_otg_pins	|| irqs		| role sysfs
125  * ---------------------+---------------++--------------+------------
126  * true			| true		|| enabled	| enabled
127  * true                 | false		|| disabled	| enabled
128  * false                | any		|| disabled	| disabled
129  */
130 
131 static void rcar_gen3_phy_usb2_work(struct work_struct *work)
132 {
133 	struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
134 						 work);
135 
136 	if (ch->extcon_host) {
137 		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, true);
138 		extcon_set_state_sync(ch->extcon, EXTCON_USB, false);
139 	} else {
140 		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, false);
141 		extcon_set_state_sync(ch->extcon, EXTCON_USB, true);
142 	}
143 }
144 
145 static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
146 {
147 	void __iomem *usb2_base = ch->base;
148 	u32 val = readl(usb2_base + USB2_COMMCTRL);
149 
150 	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, host);
151 	if (host)
152 		val &= ~USB2_COMMCTRL_OTG_PERI;
153 	else
154 		val |= USB2_COMMCTRL_OTG_PERI;
155 	writel(val, usb2_base + USB2_COMMCTRL);
156 }
157 
158 static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
159 {
160 	void __iomem *usb2_base = ch->base;
161 	u32 val = readl(usb2_base + USB2_LINECTRL1);
162 
163 	dev_vdbg(ch->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
164 	val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
165 	if (dp)
166 		val |= USB2_LINECTRL1_DP_RPD;
167 	if (dm)
168 		val |= USB2_LINECTRL1_DM_RPD;
169 	writel(val, usb2_base + USB2_LINECTRL1);
170 }
171 
172 static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
173 {
174 	void __iomem *usb2_base = ch->base;
175 	u32 val = readl(usb2_base + USB2_ADPCTRL);
176 
177 	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, vbus);
178 	if (vbus)
179 		val |= USB2_ADPCTRL_DRVVBUS;
180 	else
181 		val &= ~USB2_ADPCTRL_DRVVBUS;
182 	writel(val, usb2_base + USB2_ADPCTRL);
183 }
184 
185 static void rcar_gen3_control_otg_irq(struct rcar_gen3_chan *ch, int enable)
186 {
187 	void __iomem *usb2_base = ch->base;
188 	u32 val = readl(usb2_base + USB2_OBINTEN);
189 
190 	if (ch->uses_otg_pins && enable)
191 		val |= USB2_OBINT_BITS;
192 	else
193 		val &= ~USB2_OBINT_BITS;
194 	writel(val, usb2_base + USB2_OBINTEN);
195 }
196 
197 static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
198 {
199 	rcar_gen3_set_linectrl(ch, 1, 1);
200 	rcar_gen3_set_host_mode(ch, 1);
201 	rcar_gen3_enable_vbus_ctrl(ch, 1);
202 
203 	ch->extcon_host = true;
204 	schedule_work(&ch->work);
205 }
206 
207 static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
208 {
209 	rcar_gen3_set_linectrl(ch, 0, 1);
210 	rcar_gen3_set_host_mode(ch, 0);
211 	rcar_gen3_enable_vbus_ctrl(ch, 0);
212 
213 	ch->extcon_host = false;
214 	schedule_work(&ch->work);
215 }
216 
217 static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
218 {
219 	void __iomem *usb2_base = ch->base;
220 	u32 val;
221 
222 	val = readl(usb2_base + USB2_LINECTRL1);
223 	writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
224 
225 	rcar_gen3_set_linectrl(ch, 1, 1);
226 	rcar_gen3_set_host_mode(ch, 1);
227 	rcar_gen3_enable_vbus_ctrl(ch, 0);
228 
229 	val = readl(usb2_base + USB2_LINECTRL1);
230 	writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
231 }
232 
233 static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
234 {
235 	rcar_gen3_set_linectrl(ch, 0, 1);
236 	rcar_gen3_set_host_mode(ch, 0);
237 	rcar_gen3_enable_vbus_ctrl(ch, 1);
238 }
239 
240 static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
241 {
242 	rcar_gen3_control_otg_irq(ch, 0);
243 
244 	rcar_gen3_enable_vbus_ctrl(ch, 1);
245 	rcar_gen3_init_for_host(ch);
246 
247 	rcar_gen3_control_otg_irq(ch, 1);
248 }
249 
250 static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
251 {
252 	if (!ch->uses_otg_pins)
253 		return (ch->dr_mode == USB_DR_MODE_HOST) ? false : true;
254 
255 	return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
256 }
257 
258 static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
259 {
260 	if (!rcar_gen3_check_id(ch))
261 		rcar_gen3_init_for_host(ch);
262 	else
263 		rcar_gen3_init_for_peri(ch);
264 }
265 
266 static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
267 {
268 	return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
269 }
270 
271 static enum phy_mode rcar_gen3_get_phy_mode(struct rcar_gen3_chan *ch)
272 {
273 	if (rcar_gen3_is_host(ch))
274 		return PHY_MODE_USB_HOST;
275 
276 	return PHY_MODE_USB_DEVICE;
277 }
278 
279 static bool rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan *ch)
280 {
281 	int i;
282 
283 	for (i = 0; i < NUM_OF_PHYS; i++) {
284 		if (ch->rphys[i].initialized)
285 			return true;
286 	}
287 
288 	return false;
289 }
290 
291 static bool rcar_gen3_needs_init_otg(struct rcar_gen3_chan *ch)
292 {
293 	int i;
294 
295 	for (i = 0; i < NUM_OF_PHYS; i++) {
296 		if (ch->rphys[i].otg_initialized)
297 			return false;
298 	}
299 
300 	return true;
301 }
302 
303 static bool rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan *ch)
304 {
305 	int i;
306 
307 	for (i = 0; i < NUM_OF_PHYS; i++) {
308 		if (ch->rphys[i].powered)
309 			return false;
310 	}
311 
312 	return true;
313 }
314 
315 static ssize_t role_store(struct device *dev, struct device_attribute *attr,
316 			  const char *buf, size_t count)
317 {
318 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
319 	bool is_b_device;
320 	enum phy_mode cur_mode, new_mode;
321 
322 	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
323 		return -EIO;
324 
325 	if (sysfs_streq(buf, "host"))
326 		new_mode = PHY_MODE_USB_HOST;
327 	else if (sysfs_streq(buf, "peripheral"))
328 		new_mode = PHY_MODE_USB_DEVICE;
329 	else
330 		return -EINVAL;
331 
332 	/* is_b_device: true is B-Device. false is A-Device. */
333 	is_b_device = rcar_gen3_check_id(ch);
334 	cur_mode = rcar_gen3_get_phy_mode(ch);
335 
336 	/* If current and new mode is the same, this returns the error */
337 	if (cur_mode == new_mode)
338 		return -EINVAL;
339 
340 	if (new_mode == PHY_MODE_USB_HOST) { /* And is_host must be false */
341 		if (!is_b_device)	/* A-Peripheral */
342 			rcar_gen3_init_from_a_peri_to_a_host(ch);
343 		else			/* B-Peripheral */
344 			rcar_gen3_init_for_b_host(ch);
345 	} else {			/* And is_host must be true */
346 		if (!is_b_device)	/* A-Host */
347 			rcar_gen3_init_for_a_peri(ch);
348 		else			/* B-Host */
349 			rcar_gen3_init_for_peri(ch);
350 	}
351 
352 	return count;
353 }
354 
355 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
356 			 char *buf)
357 {
358 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
359 
360 	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
361 		return -EIO;
362 
363 	return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
364 							    "peripheral");
365 }
366 static DEVICE_ATTR_RW(role);
367 
368 static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
369 {
370 	void __iomem *usb2_base = ch->base;
371 	u32 val;
372 
373 	/* Should not use functions of read-modify-write a register */
374 	val = readl(usb2_base + USB2_LINECTRL1);
375 	val = (val & ~USB2_LINECTRL1_DP_RPD) | USB2_LINECTRL1_DPRPD_EN |
376 	      USB2_LINECTRL1_DMRPD_EN | USB2_LINECTRL1_DM_RPD;
377 	writel(val, usb2_base + USB2_LINECTRL1);
378 
379 	val = readl(usb2_base + USB2_VBCTRL);
380 	val &= ~USB2_VBCTRL_OCCLREN;
381 	writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
382 	val = readl(usb2_base + USB2_ADPCTRL);
383 	writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
384 
385 	msleep(20);
386 
387 	writel(0xffffffff, usb2_base + USB2_OBINTSTA);
388 	writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTEN);
389 
390 	rcar_gen3_device_recognition(ch);
391 }
392 
393 static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
394 {
395 	struct rcar_gen3_chan *ch = _ch;
396 	void __iomem *usb2_base = ch->base;
397 	u32 status = readl(usb2_base + USB2_OBINTSTA);
398 	irqreturn_t ret = IRQ_NONE;
399 
400 	if (status & USB2_OBINT_BITS) {
401 		dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
402 		writel(USB2_OBINT_BITS, usb2_base + USB2_OBINTSTA);
403 		rcar_gen3_device_recognition(ch);
404 		ret = IRQ_HANDLED;
405 	}
406 
407 	return ret;
408 }
409 
410 static int rcar_gen3_phy_usb2_init(struct phy *p)
411 {
412 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
413 	struct rcar_gen3_chan *channel = rphy->ch;
414 	void __iomem *usb2_base = channel->base;
415 	u32 val;
416 	int ret;
417 
418 	if (!rcar_gen3_is_any_rphy_initialized(channel) && channel->irq >= 0) {
419 		INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
420 		ret = request_irq(channel->irq, rcar_gen3_phy_usb2_irq,
421 				  IRQF_SHARED, dev_name(channel->dev), channel);
422 		if (ret < 0) {
423 			dev_err(channel->dev, "No irq handler (%d)\n", channel->irq);
424 			return ret;
425 		}
426 	}
427 
428 	/* Initialize USB2 part */
429 	val = readl(usb2_base + USB2_INT_ENABLE);
430 	val |= USB2_INT_ENABLE_UCOM_INTEN | rphy->int_enable_bits;
431 	writel(val, usb2_base + USB2_INT_ENABLE);
432 	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
433 	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
434 
435 	/* Initialize otg part */
436 	if (channel->is_otg_channel) {
437 		if (rcar_gen3_needs_init_otg(channel))
438 			rcar_gen3_init_otg(channel);
439 		rphy->otg_initialized = true;
440 	}
441 
442 	rphy->initialized = true;
443 
444 	return 0;
445 }
446 
447 static int rcar_gen3_phy_usb2_exit(struct phy *p)
448 {
449 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
450 	struct rcar_gen3_chan *channel = rphy->ch;
451 	void __iomem *usb2_base = channel->base;
452 	u32 val;
453 
454 	rphy->initialized = false;
455 
456 	if (channel->is_otg_channel)
457 		rphy->otg_initialized = false;
458 
459 	val = readl(usb2_base + USB2_INT_ENABLE);
460 	val &= ~rphy->int_enable_bits;
461 	if (!rcar_gen3_is_any_rphy_initialized(channel))
462 		val &= ~USB2_INT_ENABLE_UCOM_INTEN;
463 	writel(val, usb2_base + USB2_INT_ENABLE);
464 
465 	if (channel->irq >= 0 && !rcar_gen3_is_any_rphy_initialized(channel))
466 		free_irq(channel->irq, channel);
467 
468 	return 0;
469 }
470 
471 static int rcar_gen3_phy_usb2_power_on(struct phy *p)
472 {
473 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
474 	struct rcar_gen3_chan *channel = rphy->ch;
475 	void __iomem *usb2_base = channel->base;
476 	u32 val;
477 	int ret = 0;
478 
479 	mutex_lock(&channel->lock);
480 	if (!rcar_gen3_are_all_rphys_power_off(channel))
481 		goto out;
482 
483 	if (channel->vbus) {
484 		ret = regulator_enable(channel->vbus);
485 		if (ret)
486 			goto out;
487 	}
488 
489 	val = readl(usb2_base + USB2_USBCTR);
490 	val |= USB2_USBCTR_PLL_RST;
491 	writel(val, usb2_base + USB2_USBCTR);
492 	val &= ~USB2_USBCTR_PLL_RST;
493 	writel(val, usb2_base + USB2_USBCTR);
494 
495 out:
496 	/* The powered flag should be set for any other phys anyway */
497 	rphy->powered = true;
498 	mutex_unlock(&channel->lock);
499 
500 	return 0;
501 }
502 
503 static int rcar_gen3_phy_usb2_power_off(struct phy *p)
504 {
505 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
506 	struct rcar_gen3_chan *channel = rphy->ch;
507 	int ret = 0;
508 
509 	mutex_lock(&channel->lock);
510 	rphy->powered = false;
511 
512 	if (!rcar_gen3_are_all_rphys_power_off(channel))
513 		goto out;
514 
515 	if (channel->vbus)
516 		ret = regulator_disable(channel->vbus);
517 
518 out:
519 	mutex_unlock(&channel->lock);
520 
521 	return ret;
522 }
523 
524 static const struct phy_ops rcar_gen3_phy_usb2_ops = {
525 	.init		= rcar_gen3_phy_usb2_init,
526 	.exit		= rcar_gen3_phy_usb2_exit,
527 	.power_on	= rcar_gen3_phy_usb2_power_on,
528 	.power_off	= rcar_gen3_phy_usb2_power_off,
529 	.owner		= THIS_MODULE,
530 };
531 
532 static const struct phy_ops rz_g1c_phy_usb2_ops = {
533 	.init		= rcar_gen3_phy_usb2_init,
534 	.exit		= rcar_gen3_phy_usb2_exit,
535 	.owner		= THIS_MODULE,
536 };
537 
538 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
539 	{
540 		.compatible = "renesas,usb2-phy-r8a77470",
541 		.data = &rz_g1c_phy_usb2_ops,
542 	},
543 	{
544 		.compatible = "renesas,usb2-phy-r8a7795",
545 		.data = &rcar_gen3_phy_usb2_ops,
546 	},
547 	{
548 		.compatible = "renesas,usb2-phy-r8a7796",
549 		.data = &rcar_gen3_phy_usb2_ops,
550 	},
551 	{
552 		.compatible = "renesas,usb2-phy-r8a77965",
553 		.data = &rcar_gen3_phy_usb2_ops,
554 	},
555 	{
556 		.compatible = "renesas,rcar-gen3-usb2-phy",
557 		.data = &rcar_gen3_phy_usb2_ops,
558 	},
559 	{ /* sentinel */ },
560 };
561 MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
562 
563 static const unsigned int rcar_gen3_phy_cable[] = {
564 	EXTCON_USB,
565 	EXTCON_USB_HOST,
566 	EXTCON_NONE,
567 };
568 
569 static struct phy *rcar_gen3_phy_usb2_xlate(struct device *dev,
570 					    struct of_phandle_args *args)
571 {
572 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
573 
574 	if (args->args_count == 0)	/* For old version dts */
575 		return ch->rphys[PHY_INDEX_BOTH_HC].phy;
576 	else if (args->args_count > 1)	/* Prevent invalid args count */
577 		return ERR_PTR(-ENODEV);
578 
579 	if (args->args[0] >= NUM_OF_PHYS)
580 		return ERR_PTR(-ENODEV);
581 
582 	return ch->rphys[args->args[0]].phy;
583 }
584 
585 static enum usb_dr_mode rcar_gen3_get_dr_mode(struct device_node *np)
586 {
587 	enum usb_dr_mode candidate = USB_DR_MODE_UNKNOWN;
588 	int i;
589 
590 	/*
591 	 * If one of device nodes has other dr_mode except UNKNOWN,
592 	 * this function returns UNKNOWN. To achieve backward compatibility,
593 	 * this loop starts the index as 0.
594 	 */
595 	for (i = 0; i < NUM_OF_PHYS; i++) {
596 		enum usb_dr_mode mode = of_usb_get_dr_mode_by_phy(np, i);
597 
598 		if (mode != USB_DR_MODE_UNKNOWN) {
599 			if (candidate == USB_DR_MODE_UNKNOWN)
600 				candidate = mode;
601 			else if (candidate != mode)
602 				return USB_DR_MODE_UNKNOWN;
603 		}
604 	}
605 
606 	return candidate;
607 }
608 
609 static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
610 {
611 	struct device *dev = &pdev->dev;
612 	struct rcar_gen3_chan *channel;
613 	struct phy_provider *provider;
614 	const struct phy_ops *phy_usb2_ops;
615 	int ret = 0, i;
616 
617 	if (!dev->of_node) {
618 		dev_err(dev, "This driver needs device tree\n");
619 		return -EINVAL;
620 	}
621 
622 	channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
623 	if (!channel)
624 		return -ENOMEM;
625 
626 	channel->base = devm_platform_ioremap_resource(pdev, 0);
627 	if (IS_ERR(channel->base))
628 		return PTR_ERR(channel->base);
629 
630 	/* get irq number here and request_irq for OTG in phy_init */
631 	channel->irq = platform_get_irq_optional(pdev, 0);
632 	channel->dr_mode = rcar_gen3_get_dr_mode(dev->of_node);
633 	if (channel->dr_mode != USB_DR_MODE_UNKNOWN) {
634 		int ret;
635 
636 		channel->is_otg_channel = true;
637 		channel->uses_otg_pins = !of_property_read_bool(dev->of_node,
638 							"renesas,no-otg-pins");
639 		channel->extcon = devm_extcon_dev_allocate(dev,
640 							rcar_gen3_phy_cable);
641 		if (IS_ERR(channel->extcon))
642 			return PTR_ERR(channel->extcon);
643 
644 		ret = devm_extcon_dev_register(dev, channel->extcon);
645 		if (ret < 0) {
646 			dev_err(dev, "Failed to register extcon\n");
647 			return ret;
648 		}
649 	}
650 
651 	/*
652 	 * devm_phy_create() will call pm_runtime_enable(&phy->dev);
653 	 * And then, phy-core will manage runtime pm for this device.
654 	 */
655 	pm_runtime_enable(dev);
656 	phy_usb2_ops = of_device_get_match_data(dev);
657 	if (!phy_usb2_ops) {
658 		ret = -EINVAL;
659 		goto error;
660 	}
661 
662 	mutex_init(&channel->lock);
663 	for (i = 0; i < NUM_OF_PHYS; i++) {
664 		channel->rphys[i].phy = devm_phy_create(dev, NULL,
665 							phy_usb2_ops);
666 		if (IS_ERR(channel->rphys[i].phy)) {
667 			dev_err(dev, "Failed to create USB2 PHY\n");
668 			ret = PTR_ERR(channel->rphys[i].phy);
669 			goto error;
670 		}
671 		channel->rphys[i].ch = channel;
672 		channel->rphys[i].int_enable_bits = rcar_gen3_int_enable[i];
673 		phy_set_drvdata(channel->rphys[i].phy, &channel->rphys[i]);
674 	}
675 
676 	channel->vbus = devm_regulator_get_optional(dev, "vbus");
677 	if (IS_ERR(channel->vbus)) {
678 		if (PTR_ERR(channel->vbus) == -EPROBE_DEFER) {
679 			ret = PTR_ERR(channel->vbus);
680 			goto error;
681 		}
682 		channel->vbus = NULL;
683 	}
684 
685 	platform_set_drvdata(pdev, channel);
686 	channel->dev = dev;
687 
688 	provider = devm_of_phy_provider_register(dev, rcar_gen3_phy_usb2_xlate);
689 	if (IS_ERR(provider)) {
690 		dev_err(dev, "Failed to register PHY provider\n");
691 		ret = PTR_ERR(provider);
692 		goto error;
693 	} else if (channel->is_otg_channel) {
694 		int ret;
695 
696 		ret = device_create_file(dev, &dev_attr_role);
697 		if (ret < 0)
698 			goto error;
699 	}
700 
701 	return 0;
702 
703 error:
704 	pm_runtime_disable(dev);
705 
706 	return ret;
707 }
708 
709 static int rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
710 {
711 	struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
712 
713 	if (channel->is_otg_channel)
714 		device_remove_file(&pdev->dev, &dev_attr_role);
715 
716 	pm_runtime_disable(&pdev->dev);
717 
718 	return 0;
719 };
720 
721 static struct platform_driver rcar_gen3_phy_usb2_driver = {
722 	.driver = {
723 		.name		= "phy_rcar_gen3_usb2",
724 		.of_match_table	= rcar_gen3_phy_usb2_match_table,
725 	},
726 	.probe	= rcar_gen3_phy_usb2_probe,
727 	.remove = rcar_gen3_phy_usb2_remove,
728 };
729 module_platform_driver(rcar_gen3_phy_usb2_driver);
730 
731 MODULE_LICENSE("GPL v2");
732 MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
733 MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
734