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 #define USB2_VBCTRL_VBOUT		BIT(0)
68 
69 /* LINECTRL1 */
70 #define USB2_LINECTRL1_DPRPD_EN		BIT(19)
71 #define USB2_LINECTRL1_DP_RPD		BIT(18)
72 #define USB2_LINECTRL1_DMRPD_EN		BIT(17)
73 #define USB2_LINECTRL1_DM_RPD		BIT(16)
74 #define USB2_LINECTRL1_OPMODE_NODRV	BIT(6)
75 
76 /* ADPCTRL */
77 #define USB2_ADPCTRL_OTGSESSVLD		BIT(20)
78 #define USB2_ADPCTRL_IDDIG		BIT(19)
79 #define USB2_ADPCTRL_IDPULLUP		BIT(5)	/* 1 = ID sampling is enabled */
80 #define USB2_ADPCTRL_DRVVBUS		BIT(4)
81 
82 /*  RZ/G2L specific */
83 #define USB2_OBINT_IDCHG_EN		BIT(0)
84 #define USB2_LINECTRL1_USB2_IDMON	BIT(0)
85 
86 #define NUM_OF_PHYS			4
87 enum rcar_gen3_phy_index {
88 	PHY_INDEX_BOTH_HC,
89 	PHY_INDEX_OHCI,
90 	PHY_INDEX_EHCI,
91 	PHY_INDEX_HSUSB
92 };
93 
94 static const u32 rcar_gen3_int_enable[NUM_OF_PHYS] = {
95 	USB2_INT_ENABLE_USBH_INTB_EN | USB2_INT_ENABLE_USBH_INTA_EN,
96 	USB2_INT_ENABLE_USBH_INTA_EN,
97 	USB2_INT_ENABLE_USBH_INTB_EN,
98 	0
99 };
100 
101 struct rcar_gen3_phy {
102 	struct phy *phy;
103 	struct rcar_gen3_chan *ch;
104 	u32 int_enable_bits;
105 	bool initialized;
106 	bool otg_initialized;
107 	bool powered;
108 };
109 
110 struct rcar_gen3_chan {
111 	void __iomem *base;
112 	struct device *dev;	/* platform_device's device */
113 	struct extcon_dev *extcon;
114 	struct rcar_gen3_phy rphys[NUM_OF_PHYS];
115 	struct regulator *vbus;
116 	struct work_struct work;
117 	struct mutex lock;	/* protects rphys[...].powered */
118 	enum usb_dr_mode dr_mode;
119 	int irq;
120 	u32 obint_enable_bits;
121 	bool extcon_host;
122 	bool is_otg_channel;
123 	bool uses_otg_pins;
124 	bool soc_no_adp_ctrl;
125 };
126 
127 struct rcar_gen3_phy_drv_data {
128 	const struct phy_ops *phy_usb2_ops;
129 	bool no_adp_ctrl;
130 };
131 
132 /*
133  * Combination about is_otg_channel and uses_otg_pins:
134  *
135  * Parameters				|| Behaviors
136  * is_otg_channel	| uses_otg_pins	|| irqs		| role sysfs
137  * ---------------------+---------------++--------------+------------
138  * true			| true		|| enabled	| enabled
139  * true                 | false		|| disabled	| enabled
140  * false                | any		|| disabled	| disabled
141  */
142 
143 static void rcar_gen3_phy_usb2_work(struct work_struct *work)
144 {
145 	struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
146 						 work);
147 
148 	if (ch->extcon_host) {
149 		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, true);
150 		extcon_set_state_sync(ch->extcon, EXTCON_USB, false);
151 	} else {
152 		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, false);
153 		extcon_set_state_sync(ch->extcon, EXTCON_USB, true);
154 	}
155 }
156 
157 static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
158 {
159 	void __iomem *usb2_base = ch->base;
160 	u32 val = readl(usb2_base + USB2_COMMCTRL);
161 
162 	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, host);
163 	if (host)
164 		val &= ~USB2_COMMCTRL_OTG_PERI;
165 	else
166 		val |= USB2_COMMCTRL_OTG_PERI;
167 	writel(val, usb2_base + USB2_COMMCTRL);
168 }
169 
170 static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
171 {
172 	void __iomem *usb2_base = ch->base;
173 	u32 val = readl(usb2_base + USB2_LINECTRL1);
174 
175 	dev_vdbg(ch->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
176 	val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
177 	if (dp)
178 		val |= USB2_LINECTRL1_DP_RPD;
179 	if (dm)
180 		val |= USB2_LINECTRL1_DM_RPD;
181 	writel(val, usb2_base + USB2_LINECTRL1);
182 }
183 
184 static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
185 {
186 	void __iomem *usb2_base = ch->base;
187 	u32 vbus_ctrl_reg = USB2_ADPCTRL;
188 	u32 vbus_ctrl_val = USB2_ADPCTRL_DRVVBUS;
189 	u32 val;
190 
191 	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, vbus);
192 	if (ch->soc_no_adp_ctrl) {
193 		vbus_ctrl_reg = USB2_VBCTRL;
194 		vbus_ctrl_val = USB2_VBCTRL_VBOUT;
195 	}
196 
197 	val = readl(usb2_base + vbus_ctrl_reg);
198 	if (vbus)
199 		val |= vbus_ctrl_val;
200 	else
201 		val &= ~vbus_ctrl_val;
202 	writel(val, usb2_base + vbus_ctrl_reg);
203 }
204 
205 static void rcar_gen3_control_otg_irq(struct rcar_gen3_chan *ch, int enable)
206 {
207 	void __iomem *usb2_base = ch->base;
208 	u32 val = readl(usb2_base + USB2_OBINTEN);
209 
210 	if (ch->uses_otg_pins && enable)
211 		val |= ch->obint_enable_bits;
212 	else
213 		val &= ~ch->obint_enable_bits;
214 	writel(val, usb2_base + USB2_OBINTEN);
215 }
216 
217 static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
218 {
219 	rcar_gen3_set_linectrl(ch, 1, 1);
220 	rcar_gen3_set_host_mode(ch, 1);
221 	rcar_gen3_enable_vbus_ctrl(ch, 1);
222 
223 	ch->extcon_host = true;
224 	schedule_work(&ch->work);
225 }
226 
227 static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
228 {
229 	rcar_gen3_set_linectrl(ch, 0, 1);
230 	rcar_gen3_set_host_mode(ch, 0);
231 	rcar_gen3_enable_vbus_ctrl(ch, 0);
232 
233 	ch->extcon_host = false;
234 	schedule_work(&ch->work);
235 }
236 
237 static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
238 {
239 	void __iomem *usb2_base = ch->base;
240 	u32 val;
241 
242 	val = readl(usb2_base + USB2_LINECTRL1);
243 	writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
244 
245 	rcar_gen3_set_linectrl(ch, 1, 1);
246 	rcar_gen3_set_host_mode(ch, 1);
247 	rcar_gen3_enable_vbus_ctrl(ch, 0);
248 
249 	val = readl(usb2_base + USB2_LINECTRL1);
250 	writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
251 }
252 
253 static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
254 {
255 	rcar_gen3_set_linectrl(ch, 0, 1);
256 	rcar_gen3_set_host_mode(ch, 0);
257 	rcar_gen3_enable_vbus_ctrl(ch, 1);
258 }
259 
260 static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
261 {
262 	rcar_gen3_control_otg_irq(ch, 0);
263 
264 	rcar_gen3_enable_vbus_ctrl(ch, 1);
265 	rcar_gen3_init_for_host(ch);
266 
267 	rcar_gen3_control_otg_irq(ch, 1);
268 }
269 
270 static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
271 {
272 	if (!ch->uses_otg_pins)
273 		return (ch->dr_mode == USB_DR_MODE_HOST) ? false : true;
274 
275 	if (ch->soc_no_adp_ctrl)
276 		return !!(readl(ch->base + USB2_LINECTRL1) & USB2_LINECTRL1_USB2_IDMON);
277 
278 	return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
279 }
280 
281 static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
282 {
283 	if (!rcar_gen3_check_id(ch))
284 		rcar_gen3_init_for_host(ch);
285 	else
286 		rcar_gen3_init_for_peri(ch);
287 }
288 
289 static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
290 {
291 	return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
292 }
293 
294 static enum phy_mode rcar_gen3_get_phy_mode(struct rcar_gen3_chan *ch)
295 {
296 	if (rcar_gen3_is_host(ch))
297 		return PHY_MODE_USB_HOST;
298 
299 	return PHY_MODE_USB_DEVICE;
300 }
301 
302 static bool rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan *ch)
303 {
304 	int i;
305 
306 	for (i = 0; i < NUM_OF_PHYS; i++) {
307 		if (ch->rphys[i].initialized)
308 			return true;
309 	}
310 
311 	return false;
312 }
313 
314 static bool rcar_gen3_needs_init_otg(struct rcar_gen3_chan *ch)
315 {
316 	int i;
317 
318 	for (i = 0; i < NUM_OF_PHYS; i++) {
319 		if (ch->rphys[i].otg_initialized)
320 			return false;
321 	}
322 
323 	return true;
324 }
325 
326 static bool rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan *ch)
327 {
328 	int i;
329 
330 	for (i = 0; i < NUM_OF_PHYS; i++) {
331 		if (ch->rphys[i].powered)
332 			return false;
333 	}
334 
335 	return true;
336 }
337 
338 static ssize_t role_store(struct device *dev, struct device_attribute *attr,
339 			  const char *buf, size_t count)
340 {
341 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
342 	bool is_b_device;
343 	enum phy_mode cur_mode, new_mode;
344 
345 	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
346 		return -EIO;
347 
348 	if (sysfs_streq(buf, "host"))
349 		new_mode = PHY_MODE_USB_HOST;
350 	else if (sysfs_streq(buf, "peripheral"))
351 		new_mode = PHY_MODE_USB_DEVICE;
352 	else
353 		return -EINVAL;
354 
355 	/* is_b_device: true is B-Device. false is A-Device. */
356 	is_b_device = rcar_gen3_check_id(ch);
357 	cur_mode = rcar_gen3_get_phy_mode(ch);
358 
359 	/* If current and new mode is the same, this returns the error */
360 	if (cur_mode == new_mode)
361 		return -EINVAL;
362 
363 	if (new_mode == PHY_MODE_USB_HOST) { /* And is_host must be false */
364 		if (!is_b_device)	/* A-Peripheral */
365 			rcar_gen3_init_from_a_peri_to_a_host(ch);
366 		else			/* B-Peripheral */
367 			rcar_gen3_init_for_b_host(ch);
368 	} else {			/* And is_host must be true */
369 		if (!is_b_device)	/* A-Host */
370 			rcar_gen3_init_for_a_peri(ch);
371 		else			/* B-Host */
372 			rcar_gen3_init_for_peri(ch);
373 	}
374 
375 	return count;
376 }
377 
378 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
379 			 char *buf)
380 {
381 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
382 
383 	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
384 		return -EIO;
385 
386 	return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
387 							    "peripheral");
388 }
389 static DEVICE_ATTR_RW(role);
390 
391 static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
392 {
393 	void __iomem *usb2_base = ch->base;
394 	u32 val;
395 
396 	/* Should not use functions of read-modify-write a register */
397 	val = readl(usb2_base + USB2_LINECTRL1);
398 	val = (val & ~USB2_LINECTRL1_DP_RPD) | USB2_LINECTRL1_DPRPD_EN |
399 	      USB2_LINECTRL1_DMRPD_EN | USB2_LINECTRL1_DM_RPD;
400 	writel(val, usb2_base + USB2_LINECTRL1);
401 
402 	if (!ch->soc_no_adp_ctrl) {
403 		val = readl(usb2_base + USB2_VBCTRL);
404 		val &= ~USB2_VBCTRL_OCCLREN;
405 		writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
406 		val = readl(usb2_base + USB2_ADPCTRL);
407 		writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
408 	}
409 	msleep(20);
410 
411 	writel(0xffffffff, usb2_base + USB2_OBINTSTA);
412 	writel(ch->obint_enable_bits, usb2_base + USB2_OBINTEN);
413 
414 	rcar_gen3_device_recognition(ch);
415 }
416 
417 static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
418 {
419 	struct rcar_gen3_chan *ch = _ch;
420 	void __iomem *usb2_base = ch->base;
421 	u32 status = readl(usb2_base + USB2_OBINTSTA);
422 	irqreturn_t ret = IRQ_NONE;
423 
424 	if (status & ch->obint_enable_bits) {
425 		dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
426 		writel(ch->obint_enable_bits, usb2_base + USB2_OBINTSTA);
427 		rcar_gen3_device_recognition(ch);
428 		ret = IRQ_HANDLED;
429 	}
430 
431 	return ret;
432 }
433 
434 static int rcar_gen3_phy_usb2_init(struct phy *p)
435 {
436 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
437 	struct rcar_gen3_chan *channel = rphy->ch;
438 	void __iomem *usb2_base = channel->base;
439 	u32 val;
440 	int ret;
441 
442 	if (!rcar_gen3_is_any_rphy_initialized(channel) && channel->irq >= 0) {
443 		INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
444 		ret = request_irq(channel->irq, rcar_gen3_phy_usb2_irq,
445 				  IRQF_SHARED, dev_name(channel->dev), channel);
446 		if (ret < 0) {
447 			dev_err(channel->dev, "No irq handler (%d)\n", channel->irq);
448 			return ret;
449 		}
450 	}
451 
452 	/* Initialize USB2 part */
453 	val = readl(usb2_base + USB2_INT_ENABLE);
454 	val |= USB2_INT_ENABLE_UCOM_INTEN | rphy->int_enable_bits;
455 	writel(val, usb2_base + USB2_INT_ENABLE);
456 	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
457 	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
458 
459 	/* Initialize otg part */
460 	if (channel->is_otg_channel) {
461 		if (rcar_gen3_needs_init_otg(channel))
462 			rcar_gen3_init_otg(channel);
463 		rphy->otg_initialized = true;
464 	}
465 
466 	rphy->initialized = true;
467 
468 	return 0;
469 }
470 
471 static int rcar_gen3_phy_usb2_exit(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 
478 	rphy->initialized = false;
479 
480 	if (channel->is_otg_channel)
481 		rphy->otg_initialized = false;
482 
483 	val = readl(usb2_base + USB2_INT_ENABLE);
484 	val &= ~rphy->int_enable_bits;
485 	if (!rcar_gen3_is_any_rphy_initialized(channel))
486 		val &= ~USB2_INT_ENABLE_UCOM_INTEN;
487 	writel(val, usb2_base + USB2_INT_ENABLE);
488 
489 	if (channel->irq >= 0 && !rcar_gen3_is_any_rphy_initialized(channel))
490 		free_irq(channel->irq, channel);
491 
492 	return 0;
493 }
494 
495 static int rcar_gen3_phy_usb2_power_on(struct phy *p)
496 {
497 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
498 	struct rcar_gen3_chan *channel = rphy->ch;
499 	void __iomem *usb2_base = channel->base;
500 	u32 val;
501 	int ret = 0;
502 
503 	mutex_lock(&channel->lock);
504 	if (!rcar_gen3_are_all_rphys_power_off(channel))
505 		goto out;
506 
507 	if (channel->vbus) {
508 		ret = regulator_enable(channel->vbus);
509 		if (ret)
510 			goto out;
511 	}
512 
513 	val = readl(usb2_base + USB2_USBCTR);
514 	val |= USB2_USBCTR_PLL_RST;
515 	writel(val, usb2_base + USB2_USBCTR);
516 	val &= ~USB2_USBCTR_PLL_RST;
517 	writel(val, usb2_base + USB2_USBCTR);
518 
519 out:
520 	/* The powered flag should be set for any other phys anyway */
521 	rphy->powered = true;
522 	mutex_unlock(&channel->lock);
523 
524 	return 0;
525 }
526 
527 static int rcar_gen3_phy_usb2_power_off(struct phy *p)
528 {
529 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
530 	struct rcar_gen3_chan *channel = rphy->ch;
531 	int ret = 0;
532 
533 	mutex_lock(&channel->lock);
534 	rphy->powered = false;
535 
536 	if (!rcar_gen3_are_all_rphys_power_off(channel))
537 		goto out;
538 
539 	if (channel->vbus)
540 		ret = regulator_disable(channel->vbus);
541 
542 out:
543 	mutex_unlock(&channel->lock);
544 
545 	return ret;
546 }
547 
548 static const struct phy_ops rcar_gen3_phy_usb2_ops = {
549 	.init		= rcar_gen3_phy_usb2_init,
550 	.exit		= rcar_gen3_phy_usb2_exit,
551 	.power_on	= rcar_gen3_phy_usb2_power_on,
552 	.power_off	= rcar_gen3_phy_usb2_power_off,
553 	.owner		= THIS_MODULE,
554 };
555 
556 static const struct phy_ops rz_g1c_phy_usb2_ops = {
557 	.init		= rcar_gen3_phy_usb2_init,
558 	.exit		= rcar_gen3_phy_usb2_exit,
559 	.owner		= THIS_MODULE,
560 };
561 
562 static const struct rcar_gen3_phy_drv_data rcar_gen3_phy_usb2_data = {
563 	.phy_usb2_ops = &rcar_gen3_phy_usb2_ops,
564 	.no_adp_ctrl = false,
565 };
566 
567 static const struct rcar_gen3_phy_drv_data rz_g1c_phy_usb2_data = {
568 	.phy_usb2_ops = &rz_g1c_phy_usb2_ops,
569 	.no_adp_ctrl = false,
570 };
571 
572 static const struct rcar_gen3_phy_drv_data rz_g2l_phy_usb2_data = {
573 	.phy_usb2_ops = &rcar_gen3_phy_usb2_ops,
574 	.no_adp_ctrl = true,
575 };
576 
577 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
578 	{
579 		.compatible = "renesas,usb2-phy-r8a77470",
580 		.data = &rz_g1c_phy_usb2_data,
581 	},
582 	{
583 		.compatible = "renesas,usb2-phy-r8a7795",
584 		.data = &rcar_gen3_phy_usb2_data,
585 	},
586 	{
587 		.compatible = "renesas,usb2-phy-r8a7796",
588 		.data = &rcar_gen3_phy_usb2_data,
589 	},
590 	{
591 		.compatible = "renesas,usb2-phy-r8a77965",
592 		.data = &rcar_gen3_phy_usb2_data,
593 	},
594 	{
595 		.compatible = "renesas,rzg2l-usb2-phy",
596 		.data = &rz_g2l_phy_usb2_data,
597 	},
598 	{
599 		.compatible = "renesas,rcar-gen3-usb2-phy",
600 		.data = &rcar_gen3_phy_usb2_data,
601 	},
602 	{ /* sentinel */ },
603 };
604 MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
605 
606 static const unsigned int rcar_gen3_phy_cable[] = {
607 	EXTCON_USB,
608 	EXTCON_USB_HOST,
609 	EXTCON_NONE,
610 };
611 
612 static struct phy *rcar_gen3_phy_usb2_xlate(struct device *dev,
613 					    struct of_phandle_args *args)
614 {
615 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
616 
617 	if (args->args_count == 0)	/* For old version dts */
618 		return ch->rphys[PHY_INDEX_BOTH_HC].phy;
619 	else if (args->args_count > 1)	/* Prevent invalid args count */
620 		return ERR_PTR(-ENODEV);
621 
622 	if (args->args[0] >= NUM_OF_PHYS)
623 		return ERR_PTR(-ENODEV);
624 
625 	return ch->rphys[args->args[0]].phy;
626 }
627 
628 static enum usb_dr_mode rcar_gen3_get_dr_mode(struct device_node *np)
629 {
630 	enum usb_dr_mode candidate = USB_DR_MODE_UNKNOWN;
631 	int i;
632 
633 	/*
634 	 * If one of device nodes has other dr_mode except UNKNOWN,
635 	 * this function returns UNKNOWN. To achieve backward compatibility,
636 	 * this loop starts the index as 0.
637 	 */
638 	for (i = 0; i < NUM_OF_PHYS; i++) {
639 		enum usb_dr_mode mode = of_usb_get_dr_mode_by_phy(np, i);
640 
641 		if (mode != USB_DR_MODE_UNKNOWN) {
642 			if (candidate == USB_DR_MODE_UNKNOWN)
643 				candidate = mode;
644 			else if (candidate != mode)
645 				return USB_DR_MODE_UNKNOWN;
646 		}
647 	}
648 
649 	return candidate;
650 }
651 
652 static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
653 {
654 	const struct rcar_gen3_phy_drv_data *phy_data;
655 	struct device *dev = &pdev->dev;
656 	struct rcar_gen3_chan *channel;
657 	struct phy_provider *provider;
658 	int ret = 0, i;
659 
660 	if (!dev->of_node) {
661 		dev_err(dev, "This driver needs device tree\n");
662 		return -EINVAL;
663 	}
664 
665 	channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
666 	if (!channel)
667 		return -ENOMEM;
668 
669 	channel->base = devm_platform_ioremap_resource(pdev, 0);
670 	if (IS_ERR(channel->base))
671 		return PTR_ERR(channel->base);
672 
673 	channel->obint_enable_bits = USB2_OBINT_BITS;
674 	/* get irq number here and request_irq for OTG in phy_init */
675 	channel->irq = platform_get_irq_optional(pdev, 0);
676 	channel->dr_mode = rcar_gen3_get_dr_mode(dev->of_node);
677 	if (channel->dr_mode != USB_DR_MODE_UNKNOWN) {
678 		int ret;
679 
680 		channel->is_otg_channel = true;
681 		channel->uses_otg_pins = !of_property_read_bool(dev->of_node,
682 							"renesas,no-otg-pins");
683 		channel->extcon = devm_extcon_dev_allocate(dev,
684 							rcar_gen3_phy_cable);
685 		if (IS_ERR(channel->extcon))
686 			return PTR_ERR(channel->extcon);
687 
688 		ret = devm_extcon_dev_register(dev, channel->extcon);
689 		if (ret < 0) {
690 			dev_err(dev, "Failed to register extcon\n");
691 			return ret;
692 		}
693 	}
694 
695 	/*
696 	 * devm_phy_create() will call pm_runtime_enable(&phy->dev);
697 	 * And then, phy-core will manage runtime pm for this device.
698 	 */
699 	pm_runtime_enable(dev);
700 
701 	phy_data = of_device_get_match_data(dev);
702 	if (!phy_data) {
703 		ret = -EINVAL;
704 		goto error;
705 	}
706 
707 	channel->soc_no_adp_ctrl = phy_data->no_adp_ctrl;
708 	if (phy_data->no_adp_ctrl)
709 		channel->obint_enable_bits = USB2_OBINT_IDCHG_EN;
710 
711 	mutex_init(&channel->lock);
712 	for (i = 0; i < NUM_OF_PHYS; i++) {
713 		channel->rphys[i].phy = devm_phy_create(dev, NULL,
714 							phy_data->phy_usb2_ops);
715 		if (IS_ERR(channel->rphys[i].phy)) {
716 			dev_err(dev, "Failed to create USB2 PHY\n");
717 			ret = PTR_ERR(channel->rphys[i].phy);
718 			goto error;
719 		}
720 		channel->rphys[i].ch = channel;
721 		channel->rphys[i].int_enable_bits = rcar_gen3_int_enable[i];
722 		phy_set_drvdata(channel->rphys[i].phy, &channel->rphys[i]);
723 	}
724 
725 	channel->vbus = devm_regulator_get_optional(dev, "vbus");
726 	if (IS_ERR(channel->vbus)) {
727 		if (PTR_ERR(channel->vbus) == -EPROBE_DEFER) {
728 			ret = PTR_ERR(channel->vbus);
729 			goto error;
730 		}
731 		channel->vbus = NULL;
732 	}
733 
734 	platform_set_drvdata(pdev, channel);
735 	channel->dev = dev;
736 
737 	provider = devm_of_phy_provider_register(dev, rcar_gen3_phy_usb2_xlate);
738 	if (IS_ERR(provider)) {
739 		dev_err(dev, "Failed to register PHY provider\n");
740 		ret = PTR_ERR(provider);
741 		goto error;
742 	} else if (channel->is_otg_channel) {
743 		int ret;
744 
745 		ret = device_create_file(dev, &dev_attr_role);
746 		if (ret < 0)
747 			goto error;
748 	}
749 
750 	return 0;
751 
752 error:
753 	pm_runtime_disable(dev);
754 
755 	return ret;
756 }
757 
758 static void rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
759 {
760 	struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
761 
762 	if (channel->is_otg_channel)
763 		device_remove_file(&pdev->dev, &dev_attr_role);
764 
765 	pm_runtime_disable(&pdev->dev);
766 };
767 
768 static struct platform_driver rcar_gen3_phy_usb2_driver = {
769 	.driver = {
770 		.name		= "phy_rcar_gen3_usb2",
771 		.of_match_table	= rcar_gen3_phy_usb2_match_table,
772 	},
773 	.probe	= rcar_gen3_phy_usb2_probe,
774 	.remove_new = rcar_gen3_phy_usb2_remove,
775 };
776 module_platform_driver(rcar_gen3_phy_usb2_driver);
777 
778 MODULE_LICENSE("GPL v2");
779 MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
780 MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
781