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/phy/phy.h>
19 #include <linux/platform_device.h>
20 #include <linux/pm_runtime.h>
21 #include <linux/regulator/consumer.h>
22 #include <linux/string.h>
23 #include <linux/usb/of.h>
24 #include <linux/workqueue.h>
25 
26 /******* USB2.0 Host registers (original offset is +0x200) *******/
27 #define USB2_INT_ENABLE		0x000
28 #define USB2_USBCTR		0x00c
29 #define USB2_SPD_RSM_TIMSET	0x10c
30 #define USB2_OC_TIMSET		0x110
31 #define USB2_COMMCTRL		0x600
32 #define USB2_OBINTSTA		0x604
33 #define USB2_OBINTEN		0x608
34 #define USB2_VBCTRL		0x60c
35 #define USB2_LINECTRL1		0x610
36 #define USB2_ADPCTRL		0x630
37 
38 /* INT_ENABLE */
39 #define USB2_INT_ENABLE_UCOM_INTEN	BIT(3)
40 #define USB2_INT_ENABLE_USBH_INTB_EN	BIT(2)	/* For EHCI */
41 #define USB2_INT_ENABLE_USBH_INTA_EN	BIT(1)	/* For OHCI */
42 
43 /* USBCTR */
44 #define USB2_USBCTR_DIRPD	BIT(2)
45 #define USB2_USBCTR_PLL_RST	BIT(1)
46 
47 /* SPD_RSM_TIMSET */
48 #define USB2_SPD_RSM_TIMSET_INIT	0x014e029b
49 
50 /* OC_TIMSET */
51 #define USB2_OC_TIMSET_INIT		0x000209ab
52 
53 /* COMMCTRL */
54 #define USB2_COMMCTRL_OTG_PERI		BIT(31)	/* 1 = Peripheral mode */
55 
56 /* OBINTSTA and OBINTEN */
57 #define USB2_OBINT_SESSVLDCHG		BIT(12)
58 #define USB2_OBINT_IDDIGCHG		BIT(11)
59 #define USB2_OBINT_BITS			(USB2_OBINT_SESSVLDCHG | \
60 					 USB2_OBINT_IDDIGCHG)
61 
62 /* VBCTRL */
63 #define USB2_VBCTRL_OCCLREN		BIT(16)
64 #define USB2_VBCTRL_DRVVBUSSEL		BIT(8)
65 #define USB2_VBCTRL_VBOUT		BIT(0)
66 
67 /* LINECTRL1 */
68 #define USB2_LINECTRL1_DPRPD_EN		BIT(19)
69 #define USB2_LINECTRL1_DP_RPD		BIT(18)
70 #define USB2_LINECTRL1_DMRPD_EN		BIT(17)
71 #define USB2_LINECTRL1_DM_RPD		BIT(16)
72 #define USB2_LINECTRL1_OPMODE_NODRV	BIT(6)
73 
74 /* ADPCTRL */
75 #define USB2_ADPCTRL_OTGSESSVLD		BIT(20)
76 #define USB2_ADPCTRL_IDDIG		BIT(19)
77 #define USB2_ADPCTRL_IDPULLUP		BIT(5)	/* 1 = ID sampling is enabled */
78 #define USB2_ADPCTRL_DRVVBUS		BIT(4)
79 
80 /*  RZ/G2L specific */
81 #define USB2_OBINT_IDCHG_EN		BIT(0)
82 #define USB2_LINECTRL1_USB2_IDMON	BIT(0)
83 
84 #define NUM_OF_PHYS			4
85 enum rcar_gen3_phy_index {
86 	PHY_INDEX_BOTH_HC,
87 	PHY_INDEX_OHCI,
88 	PHY_INDEX_EHCI,
89 	PHY_INDEX_HSUSB
90 };
91 
92 static const u32 rcar_gen3_int_enable[NUM_OF_PHYS] = {
93 	USB2_INT_ENABLE_USBH_INTB_EN | USB2_INT_ENABLE_USBH_INTA_EN,
94 	USB2_INT_ENABLE_USBH_INTA_EN,
95 	USB2_INT_ENABLE_USBH_INTB_EN,
96 	0
97 };
98 
99 struct rcar_gen3_phy {
100 	struct phy *phy;
101 	struct rcar_gen3_chan *ch;
102 	u32 int_enable_bits;
103 	bool initialized;
104 	bool otg_initialized;
105 	bool powered;
106 };
107 
108 struct rcar_gen3_chan {
109 	void __iomem *base;
110 	struct device *dev;	/* platform_device's device */
111 	struct extcon_dev *extcon;
112 	struct rcar_gen3_phy rphys[NUM_OF_PHYS];
113 	struct regulator *vbus;
114 	struct work_struct work;
115 	struct mutex lock;	/* protects rphys[...].powered */
116 	enum usb_dr_mode dr_mode;
117 	int irq;
118 	u32 obint_enable_bits;
119 	bool extcon_host;
120 	bool is_otg_channel;
121 	bool uses_otg_pins;
122 	bool soc_no_adp_ctrl;
123 };
124 
125 struct rcar_gen3_phy_drv_data {
126 	const struct phy_ops *phy_usb2_ops;
127 	bool no_adp_ctrl;
128 };
129 
130 /*
131  * Combination about is_otg_channel and uses_otg_pins:
132  *
133  * Parameters				|| Behaviors
134  * is_otg_channel	| uses_otg_pins	|| irqs		| role sysfs
135  * ---------------------+---------------++--------------+------------
136  * true			| true		|| enabled	| enabled
137  * true                 | false		|| disabled	| enabled
138  * false                | any		|| disabled	| disabled
139  */
140 
rcar_gen3_phy_usb2_work(struct work_struct * work)141 static void rcar_gen3_phy_usb2_work(struct work_struct *work)
142 {
143 	struct rcar_gen3_chan *ch = container_of(work, struct rcar_gen3_chan,
144 						 work);
145 
146 	if (ch->extcon_host) {
147 		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, true);
148 		extcon_set_state_sync(ch->extcon, EXTCON_USB, false);
149 	} else {
150 		extcon_set_state_sync(ch->extcon, EXTCON_USB_HOST, false);
151 		extcon_set_state_sync(ch->extcon, EXTCON_USB, true);
152 	}
153 }
154 
rcar_gen3_set_host_mode(struct rcar_gen3_chan * ch,int host)155 static void rcar_gen3_set_host_mode(struct rcar_gen3_chan *ch, int host)
156 {
157 	void __iomem *usb2_base = ch->base;
158 	u32 val = readl(usb2_base + USB2_COMMCTRL);
159 
160 	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, host);
161 	if (host)
162 		val &= ~USB2_COMMCTRL_OTG_PERI;
163 	else
164 		val |= USB2_COMMCTRL_OTG_PERI;
165 	writel(val, usb2_base + USB2_COMMCTRL);
166 }
167 
rcar_gen3_set_linectrl(struct rcar_gen3_chan * ch,int dp,int dm)168 static void rcar_gen3_set_linectrl(struct rcar_gen3_chan *ch, int dp, int dm)
169 {
170 	void __iomem *usb2_base = ch->base;
171 	u32 val = readl(usb2_base + USB2_LINECTRL1);
172 
173 	dev_vdbg(ch->dev, "%s: %08x, %d, %d\n", __func__, val, dp, dm);
174 	val &= ~(USB2_LINECTRL1_DP_RPD | USB2_LINECTRL1_DM_RPD);
175 	if (dp)
176 		val |= USB2_LINECTRL1_DP_RPD;
177 	if (dm)
178 		val |= USB2_LINECTRL1_DM_RPD;
179 	writel(val, usb2_base + USB2_LINECTRL1);
180 }
181 
rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan * ch,int vbus)182 static void rcar_gen3_enable_vbus_ctrl(struct rcar_gen3_chan *ch, int vbus)
183 {
184 	void __iomem *usb2_base = ch->base;
185 	u32 vbus_ctrl_reg = USB2_ADPCTRL;
186 	u32 vbus_ctrl_val = USB2_ADPCTRL_DRVVBUS;
187 	u32 val;
188 
189 	dev_vdbg(ch->dev, "%s: %08x, %d\n", __func__, val, vbus);
190 	if (ch->soc_no_adp_ctrl) {
191 		vbus_ctrl_reg = USB2_VBCTRL;
192 		vbus_ctrl_val = USB2_VBCTRL_VBOUT;
193 	}
194 
195 	val = readl(usb2_base + vbus_ctrl_reg);
196 	if (vbus)
197 		val |= vbus_ctrl_val;
198 	else
199 		val &= ~vbus_ctrl_val;
200 	writel(val, usb2_base + vbus_ctrl_reg);
201 }
202 
rcar_gen3_control_otg_irq(struct rcar_gen3_chan * ch,int enable)203 static void rcar_gen3_control_otg_irq(struct rcar_gen3_chan *ch, int enable)
204 {
205 	void __iomem *usb2_base = ch->base;
206 	u32 val = readl(usb2_base + USB2_OBINTEN);
207 
208 	if (ch->uses_otg_pins && enable)
209 		val |= ch->obint_enable_bits;
210 	else
211 		val &= ~ch->obint_enable_bits;
212 	writel(val, usb2_base + USB2_OBINTEN);
213 }
214 
rcar_gen3_init_for_host(struct rcar_gen3_chan * ch)215 static void rcar_gen3_init_for_host(struct rcar_gen3_chan *ch)
216 {
217 	rcar_gen3_set_linectrl(ch, 1, 1);
218 	rcar_gen3_set_host_mode(ch, 1);
219 	rcar_gen3_enable_vbus_ctrl(ch, 1);
220 
221 	ch->extcon_host = true;
222 	schedule_work(&ch->work);
223 }
224 
rcar_gen3_init_for_peri(struct rcar_gen3_chan * ch)225 static void rcar_gen3_init_for_peri(struct rcar_gen3_chan *ch)
226 {
227 	rcar_gen3_set_linectrl(ch, 0, 1);
228 	rcar_gen3_set_host_mode(ch, 0);
229 	rcar_gen3_enable_vbus_ctrl(ch, 0);
230 
231 	ch->extcon_host = false;
232 	schedule_work(&ch->work);
233 }
234 
rcar_gen3_init_for_b_host(struct rcar_gen3_chan * ch)235 static void rcar_gen3_init_for_b_host(struct rcar_gen3_chan *ch)
236 {
237 	void __iomem *usb2_base = ch->base;
238 	u32 val;
239 
240 	val = readl(usb2_base + USB2_LINECTRL1);
241 	writel(val | USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
242 
243 	rcar_gen3_set_linectrl(ch, 1, 1);
244 	rcar_gen3_set_host_mode(ch, 1);
245 	rcar_gen3_enable_vbus_ctrl(ch, 0);
246 
247 	val = readl(usb2_base + USB2_LINECTRL1);
248 	writel(val & ~USB2_LINECTRL1_OPMODE_NODRV, usb2_base + USB2_LINECTRL1);
249 }
250 
rcar_gen3_init_for_a_peri(struct rcar_gen3_chan * ch)251 static void rcar_gen3_init_for_a_peri(struct rcar_gen3_chan *ch)
252 {
253 	rcar_gen3_set_linectrl(ch, 0, 1);
254 	rcar_gen3_set_host_mode(ch, 0);
255 	rcar_gen3_enable_vbus_ctrl(ch, 1);
256 }
257 
rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan * ch)258 static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
259 {
260 	rcar_gen3_control_otg_irq(ch, 0);
261 
262 	rcar_gen3_enable_vbus_ctrl(ch, 1);
263 	rcar_gen3_init_for_host(ch);
264 
265 	rcar_gen3_control_otg_irq(ch, 1);
266 }
267 
rcar_gen3_check_id(struct rcar_gen3_chan * ch)268 static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
269 {
270 	if (!ch->uses_otg_pins)
271 		return (ch->dr_mode == USB_DR_MODE_HOST) ? false : true;
272 
273 	if (ch->soc_no_adp_ctrl)
274 		return !!(readl(ch->base + USB2_LINECTRL1) & USB2_LINECTRL1_USB2_IDMON);
275 
276 	return !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
277 }
278 
rcar_gen3_device_recognition(struct rcar_gen3_chan * ch)279 static void rcar_gen3_device_recognition(struct rcar_gen3_chan *ch)
280 {
281 	if (!rcar_gen3_check_id(ch))
282 		rcar_gen3_init_for_host(ch);
283 	else
284 		rcar_gen3_init_for_peri(ch);
285 }
286 
rcar_gen3_is_host(struct rcar_gen3_chan * ch)287 static bool rcar_gen3_is_host(struct rcar_gen3_chan *ch)
288 {
289 	return !(readl(ch->base + USB2_COMMCTRL) & USB2_COMMCTRL_OTG_PERI);
290 }
291 
rcar_gen3_get_phy_mode(struct rcar_gen3_chan * ch)292 static enum phy_mode rcar_gen3_get_phy_mode(struct rcar_gen3_chan *ch)
293 {
294 	if (rcar_gen3_is_host(ch))
295 		return PHY_MODE_USB_HOST;
296 
297 	return PHY_MODE_USB_DEVICE;
298 }
299 
rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan * ch)300 static bool rcar_gen3_is_any_rphy_initialized(struct rcar_gen3_chan *ch)
301 {
302 	int i;
303 
304 	for (i = 0; i < NUM_OF_PHYS; i++) {
305 		if (ch->rphys[i].initialized)
306 			return true;
307 	}
308 
309 	return false;
310 }
311 
rcar_gen3_needs_init_otg(struct rcar_gen3_chan * ch)312 static bool rcar_gen3_needs_init_otg(struct rcar_gen3_chan *ch)
313 {
314 	int i;
315 
316 	for (i = 0; i < NUM_OF_PHYS; i++) {
317 		if (ch->rphys[i].otg_initialized)
318 			return false;
319 	}
320 
321 	return true;
322 }
323 
rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan * ch)324 static bool rcar_gen3_are_all_rphys_power_off(struct rcar_gen3_chan *ch)
325 {
326 	int i;
327 
328 	for (i = 0; i < NUM_OF_PHYS; i++) {
329 		if (ch->rphys[i].powered)
330 			return false;
331 	}
332 
333 	return true;
334 }
335 
role_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)336 static ssize_t role_store(struct device *dev, struct device_attribute *attr,
337 			  const char *buf, size_t count)
338 {
339 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
340 	bool is_b_device;
341 	enum phy_mode cur_mode, new_mode;
342 
343 	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
344 		return -EIO;
345 
346 	if (sysfs_streq(buf, "host"))
347 		new_mode = PHY_MODE_USB_HOST;
348 	else if (sysfs_streq(buf, "peripheral"))
349 		new_mode = PHY_MODE_USB_DEVICE;
350 	else
351 		return -EINVAL;
352 
353 	/* is_b_device: true is B-Device. false is A-Device. */
354 	is_b_device = rcar_gen3_check_id(ch);
355 	cur_mode = rcar_gen3_get_phy_mode(ch);
356 
357 	/* If current and new mode is the same, this returns the error */
358 	if (cur_mode == new_mode)
359 		return -EINVAL;
360 
361 	if (new_mode == PHY_MODE_USB_HOST) { /* And is_host must be false */
362 		if (!is_b_device)	/* A-Peripheral */
363 			rcar_gen3_init_from_a_peri_to_a_host(ch);
364 		else			/* B-Peripheral */
365 			rcar_gen3_init_for_b_host(ch);
366 	} else {			/* And is_host must be true */
367 		if (!is_b_device)	/* A-Host */
368 			rcar_gen3_init_for_a_peri(ch);
369 		else			/* B-Host */
370 			rcar_gen3_init_for_peri(ch);
371 	}
372 
373 	return count;
374 }
375 
role_show(struct device * dev,struct device_attribute * attr,char * buf)376 static ssize_t role_show(struct device *dev, struct device_attribute *attr,
377 			 char *buf)
378 {
379 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
380 
381 	if (!ch->is_otg_channel || !rcar_gen3_is_any_rphy_initialized(ch))
382 		return -EIO;
383 
384 	return sprintf(buf, "%s\n", rcar_gen3_is_host(ch) ? "host" :
385 							    "peripheral");
386 }
387 static DEVICE_ATTR_RW(role);
388 
rcar_gen3_init_otg(struct rcar_gen3_chan * ch)389 static void rcar_gen3_init_otg(struct rcar_gen3_chan *ch)
390 {
391 	void __iomem *usb2_base = ch->base;
392 	u32 val;
393 
394 	/* Should not use functions of read-modify-write a register */
395 	val = readl(usb2_base + USB2_LINECTRL1);
396 	val = (val & ~USB2_LINECTRL1_DP_RPD) | USB2_LINECTRL1_DPRPD_EN |
397 	      USB2_LINECTRL1_DMRPD_EN | USB2_LINECTRL1_DM_RPD;
398 	writel(val, usb2_base + USB2_LINECTRL1);
399 
400 	if (!ch->soc_no_adp_ctrl) {
401 		val = readl(usb2_base + USB2_VBCTRL);
402 		val &= ~USB2_VBCTRL_OCCLREN;
403 		writel(val | USB2_VBCTRL_DRVVBUSSEL, usb2_base + USB2_VBCTRL);
404 		val = readl(usb2_base + USB2_ADPCTRL);
405 		writel(val | USB2_ADPCTRL_IDPULLUP, usb2_base + USB2_ADPCTRL);
406 	}
407 	msleep(20);
408 
409 	writel(0xffffffff, usb2_base + USB2_OBINTSTA);
410 	writel(ch->obint_enable_bits, usb2_base + USB2_OBINTEN);
411 
412 	rcar_gen3_device_recognition(ch);
413 }
414 
rcar_gen3_phy_usb2_irq(int irq,void * _ch)415 static irqreturn_t rcar_gen3_phy_usb2_irq(int irq, void *_ch)
416 {
417 	struct rcar_gen3_chan *ch = _ch;
418 	void __iomem *usb2_base = ch->base;
419 	u32 status = readl(usb2_base + USB2_OBINTSTA);
420 	irqreturn_t ret = IRQ_NONE;
421 
422 	if (status & ch->obint_enable_bits) {
423 		dev_vdbg(ch->dev, "%s: %08x\n", __func__, status);
424 		writel(ch->obint_enable_bits, usb2_base + USB2_OBINTSTA);
425 		rcar_gen3_device_recognition(ch);
426 		ret = IRQ_HANDLED;
427 	}
428 
429 	return ret;
430 }
431 
rcar_gen3_phy_usb2_init(struct phy * p)432 static int rcar_gen3_phy_usb2_init(struct phy *p)
433 {
434 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
435 	struct rcar_gen3_chan *channel = rphy->ch;
436 	void __iomem *usb2_base = channel->base;
437 	u32 val;
438 	int ret;
439 
440 	if (!rcar_gen3_is_any_rphy_initialized(channel) && channel->irq >= 0) {
441 		INIT_WORK(&channel->work, rcar_gen3_phy_usb2_work);
442 		ret = request_irq(channel->irq, rcar_gen3_phy_usb2_irq,
443 				  IRQF_SHARED, dev_name(channel->dev), channel);
444 		if (ret < 0) {
445 			dev_err(channel->dev, "No irq handler (%d)\n", channel->irq);
446 			return ret;
447 		}
448 	}
449 
450 	/* Initialize USB2 part */
451 	val = readl(usb2_base + USB2_INT_ENABLE);
452 	val |= USB2_INT_ENABLE_UCOM_INTEN | rphy->int_enable_bits;
453 	writel(val, usb2_base + USB2_INT_ENABLE);
454 	writel(USB2_SPD_RSM_TIMSET_INIT, usb2_base + USB2_SPD_RSM_TIMSET);
455 	writel(USB2_OC_TIMSET_INIT, usb2_base + USB2_OC_TIMSET);
456 
457 	/* Initialize otg part */
458 	if (channel->is_otg_channel) {
459 		if (rcar_gen3_needs_init_otg(channel))
460 			rcar_gen3_init_otg(channel);
461 		rphy->otg_initialized = true;
462 	}
463 
464 	rphy->initialized = true;
465 
466 	return 0;
467 }
468 
rcar_gen3_phy_usb2_exit(struct phy * p)469 static int rcar_gen3_phy_usb2_exit(struct phy *p)
470 {
471 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
472 	struct rcar_gen3_chan *channel = rphy->ch;
473 	void __iomem *usb2_base = channel->base;
474 	u32 val;
475 
476 	rphy->initialized = false;
477 
478 	if (channel->is_otg_channel)
479 		rphy->otg_initialized = false;
480 
481 	val = readl(usb2_base + USB2_INT_ENABLE);
482 	val &= ~rphy->int_enable_bits;
483 	if (!rcar_gen3_is_any_rphy_initialized(channel))
484 		val &= ~USB2_INT_ENABLE_UCOM_INTEN;
485 	writel(val, usb2_base + USB2_INT_ENABLE);
486 
487 	if (channel->irq >= 0 && !rcar_gen3_is_any_rphy_initialized(channel))
488 		free_irq(channel->irq, channel);
489 
490 	return 0;
491 }
492 
rcar_gen3_phy_usb2_power_on(struct phy * p)493 static int rcar_gen3_phy_usb2_power_on(struct phy *p)
494 {
495 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
496 	struct rcar_gen3_chan *channel = rphy->ch;
497 	void __iomem *usb2_base = channel->base;
498 	u32 val;
499 	int ret = 0;
500 
501 	mutex_lock(&channel->lock);
502 	if (!rcar_gen3_are_all_rphys_power_off(channel))
503 		goto out;
504 
505 	if (channel->vbus) {
506 		ret = regulator_enable(channel->vbus);
507 		if (ret)
508 			goto out;
509 	}
510 
511 	val = readl(usb2_base + USB2_USBCTR);
512 	val |= USB2_USBCTR_PLL_RST;
513 	writel(val, usb2_base + USB2_USBCTR);
514 	val &= ~USB2_USBCTR_PLL_RST;
515 	writel(val, usb2_base + USB2_USBCTR);
516 
517 out:
518 	/* The powered flag should be set for any other phys anyway */
519 	rphy->powered = true;
520 	mutex_unlock(&channel->lock);
521 
522 	return 0;
523 }
524 
rcar_gen3_phy_usb2_power_off(struct phy * p)525 static int rcar_gen3_phy_usb2_power_off(struct phy *p)
526 {
527 	struct rcar_gen3_phy *rphy = phy_get_drvdata(p);
528 	struct rcar_gen3_chan *channel = rphy->ch;
529 	int ret = 0;
530 
531 	mutex_lock(&channel->lock);
532 	rphy->powered = false;
533 
534 	if (!rcar_gen3_are_all_rphys_power_off(channel))
535 		goto out;
536 
537 	if (channel->vbus)
538 		ret = regulator_disable(channel->vbus);
539 
540 out:
541 	mutex_unlock(&channel->lock);
542 
543 	return ret;
544 }
545 
546 static const struct phy_ops rcar_gen3_phy_usb2_ops = {
547 	.init		= rcar_gen3_phy_usb2_init,
548 	.exit		= rcar_gen3_phy_usb2_exit,
549 	.power_on	= rcar_gen3_phy_usb2_power_on,
550 	.power_off	= rcar_gen3_phy_usb2_power_off,
551 	.owner		= THIS_MODULE,
552 };
553 
554 static const struct phy_ops rz_g1c_phy_usb2_ops = {
555 	.init		= rcar_gen3_phy_usb2_init,
556 	.exit		= rcar_gen3_phy_usb2_exit,
557 	.owner		= THIS_MODULE,
558 };
559 
560 static const struct rcar_gen3_phy_drv_data rcar_gen3_phy_usb2_data = {
561 	.phy_usb2_ops = &rcar_gen3_phy_usb2_ops,
562 	.no_adp_ctrl = false,
563 };
564 
565 static const struct rcar_gen3_phy_drv_data rz_g1c_phy_usb2_data = {
566 	.phy_usb2_ops = &rz_g1c_phy_usb2_ops,
567 	.no_adp_ctrl = false,
568 };
569 
570 static const struct rcar_gen3_phy_drv_data rz_g2l_phy_usb2_data = {
571 	.phy_usb2_ops = &rcar_gen3_phy_usb2_ops,
572 	.no_adp_ctrl = true,
573 };
574 
575 static const struct of_device_id rcar_gen3_phy_usb2_match_table[] = {
576 	{
577 		.compatible = "renesas,usb2-phy-r8a77470",
578 		.data = &rz_g1c_phy_usb2_data,
579 	},
580 	{
581 		.compatible = "renesas,usb2-phy-r8a7795",
582 		.data = &rcar_gen3_phy_usb2_data,
583 	},
584 	{
585 		.compatible = "renesas,usb2-phy-r8a7796",
586 		.data = &rcar_gen3_phy_usb2_data,
587 	},
588 	{
589 		.compatible = "renesas,usb2-phy-r8a77965",
590 		.data = &rcar_gen3_phy_usb2_data,
591 	},
592 	{
593 		.compatible = "renesas,rzg2l-usb2-phy",
594 		.data = &rz_g2l_phy_usb2_data,
595 	},
596 	{
597 		.compatible = "renesas,rcar-gen3-usb2-phy",
598 		.data = &rcar_gen3_phy_usb2_data,
599 	},
600 	{ /* sentinel */ },
601 };
602 MODULE_DEVICE_TABLE(of, rcar_gen3_phy_usb2_match_table);
603 
604 static const unsigned int rcar_gen3_phy_cable[] = {
605 	EXTCON_USB,
606 	EXTCON_USB_HOST,
607 	EXTCON_NONE,
608 };
609 
rcar_gen3_phy_usb2_xlate(struct device * dev,struct of_phandle_args * args)610 static struct phy *rcar_gen3_phy_usb2_xlate(struct device *dev,
611 					    struct of_phandle_args *args)
612 {
613 	struct rcar_gen3_chan *ch = dev_get_drvdata(dev);
614 
615 	if (args->args_count == 0)	/* For old version dts */
616 		return ch->rphys[PHY_INDEX_BOTH_HC].phy;
617 	else if (args->args_count > 1)	/* Prevent invalid args count */
618 		return ERR_PTR(-ENODEV);
619 
620 	if (args->args[0] >= NUM_OF_PHYS)
621 		return ERR_PTR(-ENODEV);
622 
623 	return ch->rphys[args->args[0]].phy;
624 }
625 
rcar_gen3_get_dr_mode(struct device_node * np)626 static enum usb_dr_mode rcar_gen3_get_dr_mode(struct device_node *np)
627 {
628 	enum usb_dr_mode candidate = USB_DR_MODE_UNKNOWN;
629 	int i;
630 
631 	/*
632 	 * If one of device nodes has other dr_mode except UNKNOWN,
633 	 * this function returns UNKNOWN. To achieve backward compatibility,
634 	 * this loop starts the index as 0.
635 	 */
636 	for (i = 0; i < NUM_OF_PHYS; i++) {
637 		enum usb_dr_mode mode = of_usb_get_dr_mode_by_phy(np, i);
638 
639 		if (mode != USB_DR_MODE_UNKNOWN) {
640 			if (candidate == USB_DR_MODE_UNKNOWN)
641 				candidate = mode;
642 			else if (candidate != mode)
643 				return USB_DR_MODE_UNKNOWN;
644 		}
645 	}
646 
647 	return candidate;
648 }
649 
rcar_gen3_phy_usb2_probe(struct platform_device * pdev)650 static int rcar_gen3_phy_usb2_probe(struct platform_device *pdev)
651 {
652 	const struct rcar_gen3_phy_drv_data *phy_data;
653 	struct device *dev = &pdev->dev;
654 	struct rcar_gen3_chan *channel;
655 	struct phy_provider *provider;
656 	int ret = 0, i;
657 
658 	if (!dev->of_node) {
659 		dev_err(dev, "This driver needs device tree\n");
660 		return -EINVAL;
661 	}
662 
663 	channel = devm_kzalloc(dev, sizeof(*channel), GFP_KERNEL);
664 	if (!channel)
665 		return -ENOMEM;
666 
667 	channel->base = devm_platform_ioremap_resource(pdev, 0);
668 	if (IS_ERR(channel->base))
669 		return PTR_ERR(channel->base);
670 
671 	channel->obint_enable_bits = USB2_OBINT_BITS;
672 	/* get irq number here and request_irq for OTG in phy_init */
673 	channel->irq = platform_get_irq_optional(pdev, 0);
674 	channel->dr_mode = rcar_gen3_get_dr_mode(dev->of_node);
675 	if (channel->dr_mode != USB_DR_MODE_UNKNOWN) {
676 		channel->is_otg_channel = true;
677 		channel->uses_otg_pins = !of_property_read_bool(dev->of_node,
678 							"renesas,no-otg-pins");
679 		channel->extcon = devm_extcon_dev_allocate(dev,
680 							rcar_gen3_phy_cable);
681 		if (IS_ERR(channel->extcon))
682 			return PTR_ERR(channel->extcon);
683 
684 		ret = devm_extcon_dev_register(dev, channel->extcon);
685 		if (ret < 0) {
686 			dev_err(dev, "Failed to register extcon\n");
687 			return ret;
688 		}
689 	}
690 
691 	/*
692 	 * devm_phy_create() will call pm_runtime_enable(&phy->dev);
693 	 * And then, phy-core will manage runtime pm for this device.
694 	 */
695 	pm_runtime_enable(dev);
696 
697 	phy_data = of_device_get_match_data(dev);
698 	if (!phy_data) {
699 		ret = -EINVAL;
700 		goto error;
701 	}
702 
703 	channel->soc_no_adp_ctrl = phy_data->no_adp_ctrl;
704 	if (phy_data->no_adp_ctrl)
705 		channel->obint_enable_bits = USB2_OBINT_IDCHG_EN;
706 
707 	mutex_init(&channel->lock);
708 	for (i = 0; i < NUM_OF_PHYS; i++) {
709 		channel->rphys[i].phy = devm_phy_create(dev, NULL,
710 							phy_data->phy_usb2_ops);
711 		if (IS_ERR(channel->rphys[i].phy)) {
712 			dev_err(dev, "Failed to create USB2 PHY\n");
713 			ret = PTR_ERR(channel->rphys[i].phy);
714 			goto error;
715 		}
716 		channel->rphys[i].ch = channel;
717 		channel->rphys[i].int_enable_bits = rcar_gen3_int_enable[i];
718 		phy_set_drvdata(channel->rphys[i].phy, &channel->rphys[i]);
719 	}
720 
721 	channel->vbus = devm_regulator_get_optional(dev, "vbus");
722 	if (IS_ERR(channel->vbus)) {
723 		if (PTR_ERR(channel->vbus) == -EPROBE_DEFER) {
724 			ret = PTR_ERR(channel->vbus);
725 			goto error;
726 		}
727 		channel->vbus = NULL;
728 	}
729 
730 	platform_set_drvdata(pdev, channel);
731 	channel->dev = dev;
732 
733 	provider = devm_of_phy_provider_register(dev, rcar_gen3_phy_usb2_xlate);
734 	if (IS_ERR(provider)) {
735 		dev_err(dev, "Failed to register PHY provider\n");
736 		ret = PTR_ERR(provider);
737 		goto error;
738 	} else if (channel->is_otg_channel) {
739 		ret = device_create_file(dev, &dev_attr_role);
740 		if (ret < 0)
741 			goto error;
742 	}
743 
744 	return 0;
745 
746 error:
747 	pm_runtime_disable(dev);
748 
749 	return ret;
750 }
751 
rcar_gen3_phy_usb2_remove(struct platform_device * pdev)752 static void rcar_gen3_phy_usb2_remove(struct platform_device *pdev)
753 {
754 	struct rcar_gen3_chan *channel = platform_get_drvdata(pdev);
755 
756 	if (channel->is_otg_channel)
757 		device_remove_file(&pdev->dev, &dev_attr_role);
758 
759 	pm_runtime_disable(&pdev->dev);
760 };
761 
762 static struct platform_driver rcar_gen3_phy_usb2_driver = {
763 	.driver = {
764 		.name		= "phy_rcar_gen3_usb2",
765 		.of_match_table	= rcar_gen3_phy_usb2_match_table,
766 	},
767 	.probe	= rcar_gen3_phy_usb2_probe,
768 	.remove_new = rcar_gen3_phy_usb2_remove,
769 };
770 module_platform_driver(rcar_gen3_phy_usb2_driver);
771 
772 MODULE_LICENSE("GPL v2");
773 MODULE_DESCRIPTION("Renesas R-Car Gen3 USB 2.0 PHY");
774 MODULE_AUTHOR("Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>");
775