1 // SPDX-License-Identifier: GPL-1.0+
2 /*
3  * Renesas USB driver
4  *
5  * Copyright (C) 2011 Renesas Solutions Corp.
6  * Copyright (C) 2019 Renesas Electronics Corporation
7  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
8  */
9 #include <linux/clk.h>
10 #include <linux/err.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/of.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/reset.h>
17 #include <linux/slab.h>
18 #include <linux/sysfs.h>
19 #include "common.h"
20 #include "rcar2.h"
21 #include "rcar3.h"
22 #include "rza.h"
23 
24 /*
25  *		image of renesas_usbhs
26  *
27  * ex) gadget case
28 
29  * mod.c
30  * mod_gadget.c
31  * mod_host.c		pipe.c		fifo.c
32  *
33  *			+-------+	+-----------+
34  *			| pipe0 |------>| fifo pio  |
35  * +------------+	+-------+	+-----------+
36  * | mod_gadget |=====> | pipe1 |--+
37  * +------------+	+-------+  |	+-----------+
38  *			| pipe2 |  |  +-| fifo dma0 |
39  * +------------+	+-------+  |  |	+-----------+
40  * | mod_host   |	| pipe3 |<-|--+
41  * +------------+	+-------+  |	+-----------+
42  *			| ....  |  +--->| fifo dma1 |
43  *			| ....  |	+-----------+
44  */
45 
46 /*
47  * platform call back
48  *
49  * renesas usb support platform callback function.
50  * Below macro call it.
51  * if platform doesn't have callback, it return 0 (no error)
52  */
53 #define usbhs_platform_call(priv, func, args...)\
54 	(!(priv) ? -ENODEV :			\
55 	 !((priv)->pfunc->func) ? 0 :		\
56 	 (priv)->pfunc->func(args))
57 
58 /*
59  *		common functions
60  */
61 u16 usbhs_read(struct usbhs_priv *priv, u32 reg)
62 {
63 	return ioread16(priv->base + reg);
64 }
65 
66 void usbhs_write(struct usbhs_priv *priv, u32 reg, u16 data)
67 {
68 	iowrite16(data, priv->base + reg);
69 }
70 
71 void usbhs_bset(struct usbhs_priv *priv, u32 reg, u16 mask, u16 data)
72 {
73 	u16 val = usbhs_read(priv, reg);
74 
75 	val &= ~mask;
76 	val |= data & mask;
77 
78 	usbhs_write(priv, reg, val);
79 }
80 
81 struct usbhs_priv *usbhs_pdev_to_priv(struct platform_device *pdev)
82 {
83 	return dev_get_drvdata(&pdev->dev);
84 }
85 
86 int usbhs_get_id_as_gadget(struct platform_device *pdev)
87 {
88 	return USBHS_GADGET;
89 }
90 
91 /*
92  *		syscfg functions
93  */
94 static void usbhs_sys_clock_ctrl(struct usbhs_priv *priv, int enable)
95 {
96 	usbhs_bset(priv, SYSCFG, SCKE, enable ? SCKE : 0);
97 }
98 
99 void usbhs_sys_host_ctrl(struct usbhs_priv *priv, int enable)
100 {
101 	u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
102 	u16 val  = DCFM | DRPD | HSE | USBE;
103 
104 	/*
105 	 * if enable
106 	 *
107 	 * - select Host mode
108 	 * - D+ Line/D- Line Pull-down
109 	 */
110 	usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
111 }
112 
113 void usbhs_sys_function_ctrl(struct usbhs_priv *priv, int enable)
114 {
115 	u16 mask = DCFM | DRPD | DPRPU | HSE | USBE;
116 	u16 val  = HSE | USBE;
117 
118 	/* CNEN bit is required for function operation */
119 	if (usbhs_get_dparam(priv, has_cnen)) {
120 		mask |= CNEN;
121 		val  |= CNEN;
122 	}
123 
124 	/*
125 	 * if enable
126 	 *
127 	 * - select Function mode
128 	 * - D+ Line Pull-up is disabled
129 	 *      When D+ Line Pull-up is enabled,
130 	 *      calling usbhs_sys_function_pullup(,1)
131 	 */
132 	usbhs_bset(priv, SYSCFG, mask, enable ? val : 0);
133 }
134 
135 void usbhs_sys_function_pullup(struct usbhs_priv *priv, int enable)
136 {
137 	usbhs_bset(priv, SYSCFG, DPRPU, enable ? DPRPU : 0);
138 }
139 
140 void usbhs_sys_set_test_mode(struct usbhs_priv *priv, u16 mode)
141 {
142 	usbhs_write(priv, TESTMODE, mode);
143 }
144 
145 /*
146  *		frame functions
147  */
148 int usbhs_frame_get_num(struct usbhs_priv *priv)
149 {
150 	return usbhs_read(priv, FRMNUM) & FRNM_MASK;
151 }
152 
153 /*
154  *		usb request functions
155  */
156 void usbhs_usbreq_get_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
157 {
158 	u16 val;
159 
160 	val = usbhs_read(priv, USBREQ);
161 	req->bRequest		= (val >> 8) & 0xFF;
162 	req->bRequestType	= (val >> 0) & 0xFF;
163 
164 	req->wValue	= cpu_to_le16(usbhs_read(priv, USBVAL));
165 	req->wIndex	= cpu_to_le16(usbhs_read(priv, USBINDX));
166 	req->wLength	= cpu_to_le16(usbhs_read(priv, USBLENG));
167 }
168 
169 void usbhs_usbreq_set_val(struct usbhs_priv *priv, struct usb_ctrlrequest *req)
170 {
171 	usbhs_write(priv, USBREQ,  (req->bRequest << 8) | req->bRequestType);
172 	usbhs_write(priv, USBVAL,  le16_to_cpu(req->wValue));
173 	usbhs_write(priv, USBINDX, le16_to_cpu(req->wIndex));
174 	usbhs_write(priv, USBLENG, le16_to_cpu(req->wLength));
175 
176 	usbhs_bset(priv, DCPCTR, SUREQ, SUREQ);
177 }
178 
179 /*
180  *		bus/vbus functions
181  */
182 void usbhs_bus_send_sof_enable(struct usbhs_priv *priv)
183 {
184 	u16 status = usbhs_read(priv, DVSTCTR) & (USBRST | UACT);
185 
186 	if (status != USBRST) {
187 		struct device *dev = usbhs_priv_to_dev(priv);
188 		dev_err(dev, "usbhs should be reset\n");
189 	}
190 
191 	usbhs_bset(priv, DVSTCTR, (USBRST | UACT), UACT);
192 }
193 
194 void usbhs_bus_send_reset(struct usbhs_priv *priv)
195 {
196 	usbhs_bset(priv, DVSTCTR, (USBRST | UACT), USBRST);
197 }
198 
199 int usbhs_bus_get_speed(struct usbhs_priv *priv)
200 {
201 	u16 dvstctr = usbhs_read(priv, DVSTCTR);
202 
203 	switch (RHST & dvstctr) {
204 	case RHST_LOW_SPEED:
205 		return USB_SPEED_LOW;
206 	case RHST_FULL_SPEED:
207 		return USB_SPEED_FULL;
208 	case RHST_HIGH_SPEED:
209 		return USB_SPEED_HIGH;
210 	}
211 
212 	return USB_SPEED_UNKNOWN;
213 }
214 
215 int usbhs_vbus_ctrl(struct usbhs_priv *priv, int enable)
216 {
217 	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
218 
219 	return usbhs_platform_call(priv, set_vbus, pdev, enable);
220 }
221 
222 static void usbhsc_bus_init(struct usbhs_priv *priv)
223 {
224 	usbhs_write(priv, DVSTCTR, 0);
225 
226 	usbhs_vbus_ctrl(priv, 0);
227 }
228 
229 /*
230  *		device configuration
231  */
232 int usbhs_set_device_config(struct usbhs_priv *priv, int devnum,
233 			   u16 upphub, u16 hubport, u16 speed)
234 {
235 	struct device *dev = usbhs_priv_to_dev(priv);
236 	u16 usbspd = 0;
237 	u32 reg = DEVADD0 + (2 * devnum);
238 
239 	if (devnum > 10) {
240 		dev_err(dev, "cannot set speed to unknown device %d\n", devnum);
241 		return -EIO;
242 	}
243 
244 	if (upphub > 0xA) {
245 		dev_err(dev, "unsupported hub number %d\n", upphub);
246 		return -EIO;
247 	}
248 
249 	switch (speed) {
250 	case USB_SPEED_LOW:
251 		usbspd = USBSPD_SPEED_LOW;
252 		break;
253 	case USB_SPEED_FULL:
254 		usbspd = USBSPD_SPEED_FULL;
255 		break;
256 	case USB_SPEED_HIGH:
257 		usbspd = USBSPD_SPEED_HIGH;
258 		break;
259 	default:
260 		dev_err(dev, "unsupported speed %d\n", speed);
261 		return -EIO;
262 	}
263 
264 	usbhs_write(priv, reg,	UPPHUB(upphub)	|
265 				HUBPORT(hubport)|
266 				USBSPD(usbspd));
267 
268 	return 0;
269 }
270 
271 /*
272  *		interrupt functions
273  */
274 void usbhs_xxxsts_clear(struct usbhs_priv *priv, u16 sts_reg, u16 bit)
275 {
276 	u16 pipe_mask = (u16)GENMASK(usbhs_get_dparam(priv, pipe_size), 0);
277 
278 	usbhs_write(priv, sts_reg, ~(1 << bit) & pipe_mask);
279 }
280 
281 /*
282  *		local functions
283  */
284 static void usbhsc_set_buswait(struct usbhs_priv *priv)
285 {
286 	int wait = usbhs_get_dparam(priv, buswait_bwait);
287 
288 	/* set bus wait if platform have */
289 	if (wait)
290 		usbhs_bset(priv, BUSWAIT, 0x000F, wait);
291 }
292 
293 static bool usbhsc_is_multi_clks(struct usbhs_priv *priv)
294 {
295 	return priv->dparam.multi_clks;
296 }
297 
298 static int usbhsc_clk_get(struct device *dev, struct usbhs_priv *priv)
299 {
300 	if (!usbhsc_is_multi_clks(priv))
301 		return 0;
302 
303 	/* The first clock should exist */
304 	priv->clks[0] = of_clk_get(dev_of_node(dev), 0);
305 	if (IS_ERR(priv->clks[0]))
306 		return PTR_ERR(priv->clks[0]);
307 
308 	/*
309 	 * To backward compatibility with old DT, this driver checks the return
310 	 * value if it's -ENOENT or not.
311 	 */
312 	priv->clks[1] = of_clk_get(dev_of_node(dev), 1);
313 	if (PTR_ERR(priv->clks[1]) == -ENOENT)
314 		priv->clks[1] = NULL;
315 	else if (IS_ERR(priv->clks[1]))
316 		return PTR_ERR(priv->clks[1]);
317 
318 	return 0;
319 }
320 
321 static void usbhsc_clk_put(struct usbhs_priv *priv)
322 {
323 	int i;
324 
325 	if (!usbhsc_is_multi_clks(priv))
326 		return;
327 
328 	for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
329 		clk_put(priv->clks[i]);
330 }
331 
332 static int usbhsc_clk_prepare_enable(struct usbhs_priv *priv)
333 {
334 	int i, ret;
335 
336 	if (!usbhsc_is_multi_clks(priv))
337 		return 0;
338 
339 	for (i = 0; i < ARRAY_SIZE(priv->clks); i++) {
340 		ret = clk_prepare_enable(priv->clks[i]);
341 		if (ret) {
342 			while (--i >= 0)
343 				clk_disable_unprepare(priv->clks[i]);
344 			return ret;
345 		}
346 	}
347 
348 	return ret;
349 }
350 
351 static void usbhsc_clk_disable_unprepare(struct usbhs_priv *priv)
352 {
353 	int i;
354 
355 	if (!usbhsc_is_multi_clks(priv))
356 		return;
357 
358 	for (i = 0; i < ARRAY_SIZE(priv->clks); i++)
359 		clk_disable_unprepare(priv->clks[i]);
360 }
361 
362 /*
363  *		platform default param
364  */
365 
366 /* commonly used on old SH-Mobile SoCs */
367 static struct renesas_usbhs_driver_pipe_config usbhsc_default_pipe[] = {
368 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_CONTROL, 64, 0x00, false),
369 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x08, false),
370 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x18, false),
371 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x28, true),
372 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x38, true),
373 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x48, true),
374 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x04, false),
375 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x05, false),
376 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x06, false),
377 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x07, false),
378 };
379 
380 /* commonly used on newer SH-Mobile and R-Car SoCs */
381 static struct renesas_usbhs_driver_pipe_config usbhsc_new_pipe[] = {
382 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_CONTROL, 64, 0x00, false),
383 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x08, true),
384 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_ISOC, 1024, 0x28, true),
385 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x48, true),
386 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x58, true),
387 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x68, true),
388 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x04, false),
389 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x05, false),
390 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_INT, 64, 0x06, false),
391 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x78, true),
392 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x88, true),
393 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0x98, true),
394 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xa8, true),
395 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xb8, true),
396 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xc8, true),
397 	RENESAS_USBHS_PIPE(USB_ENDPOINT_XFER_BULK, 512, 0xd8, true),
398 };
399 
400 /*
401  *		power control
402  */
403 static void usbhsc_power_ctrl(struct usbhs_priv *priv, int enable)
404 {
405 	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
406 	struct device *dev = usbhs_priv_to_dev(priv);
407 
408 	if (enable) {
409 		/* enable PM */
410 		pm_runtime_get_sync(dev);
411 
412 		/* enable clks */
413 		if (usbhsc_clk_prepare_enable(priv))
414 			return;
415 
416 		/* enable platform power */
417 		usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
418 
419 		/* USB on */
420 		usbhs_sys_clock_ctrl(priv, enable);
421 	} else {
422 		/* USB off */
423 		usbhs_sys_clock_ctrl(priv, enable);
424 
425 		/* disable platform power */
426 		usbhs_platform_call(priv, power_ctrl, pdev, priv->base, enable);
427 
428 		/* disable clks */
429 		usbhsc_clk_disable_unprepare(priv);
430 
431 		/* disable PM */
432 		pm_runtime_put_sync(dev);
433 	}
434 }
435 
436 /*
437  *		hotplug
438  */
439 static void usbhsc_hotplug(struct usbhs_priv *priv)
440 {
441 	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
442 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
443 	int id;
444 	int enable;
445 	int cable;
446 	int ret;
447 
448 	/*
449 	 * get vbus status from platform
450 	 */
451 	enable = usbhs_mod_info_call(priv, get_vbus, pdev);
452 
453 	/*
454 	 * get id from platform
455 	 */
456 	id = usbhs_platform_call(priv, get_id, pdev);
457 
458 	if (enable && !mod) {
459 		if (priv->edev) {
460 			cable = extcon_get_state(priv->edev, EXTCON_USB_HOST);
461 			if ((cable > 0 && id != USBHS_HOST) ||
462 			    (!cable && id != USBHS_GADGET)) {
463 				dev_info(&pdev->dev,
464 					 "USB cable plugged in doesn't match the selected role!\n");
465 				return;
466 			}
467 		}
468 
469 		ret = usbhs_mod_change(priv, id);
470 		if (ret < 0)
471 			return;
472 
473 		dev_dbg(&pdev->dev, "%s enable\n", __func__);
474 
475 		/* power on */
476 		if (usbhs_get_dparam(priv, runtime_pwctrl))
477 			usbhsc_power_ctrl(priv, enable);
478 
479 		/* bus init */
480 		usbhsc_set_buswait(priv);
481 		usbhsc_bus_init(priv);
482 
483 		/* module start */
484 		usbhs_mod_call(priv, start, priv);
485 
486 	} else if (!enable && mod) {
487 		dev_dbg(&pdev->dev, "%s disable\n", __func__);
488 
489 		/* module stop */
490 		usbhs_mod_call(priv, stop, priv);
491 
492 		/* bus init */
493 		usbhsc_bus_init(priv);
494 
495 		/* power off */
496 		if (usbhs_get_dparam(priv, runtime_pwctrl))
497 			usbhsc_power_ctrl(priv, enable);
498 
499 		usbhs_mod_change(priv, -1);
500 
501 		/* reset phy for next connection */
502 		usbhs_platform_call(priv, phy_reset, pdev);
503 	}
504 }
505 
506 /*
507  *		notify hotplug
508  */
509 static void usbhsc_notify_hotplug(struct work_struct *work)
510 {
511 	struct usbhs_priv *priv = container_of(work,
512 					       struct usbhs_priv,
513 					       notify_hotplug_work.work);
514 	usbhsc_hotplug(priv);
515 }
516 
517 int usbhsc_schedule_notify_hotplug(struct platform_device *pdev)
518 {
519 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
520 	int delay = usbhs_get_dparam(priv, detection_delay);
521 
522 	/*
523 	 * This functions will be called in interrupt.
524 	 * To make sure safety context,
525 	 * use workqueue for usbhs_notify_hotplug
526 	 */
527 	schedule_delayed_work(&priv->notify_hotplug_work,
528 			      msecs_to_jiffies(delay));
529 	return 0;
530 }
531 
532 /*
533  *		platform functions
534  */
535 static const struct of_device_id usbhs_of_match[] = {
536 	{
537 		.compatible = "renesas,usbhs-r8a774c0",
538 		.data = &usbhs_rcar_gen3_with_pll_plat_info,
539 	},
540 	{
541 		.compatible = "renesas,usbhs-r8a7790",
542 		.data = &usbhs_rcar_gen2_plat_info,
543 	},
544 	{
545 		.compatible = "renesas,usbhs-r8a7791",
546 		.data = &usbhs_rcar_gen2_plat_info,
547 	},
548 	{
549 		.compatible = "renesas,usbhs-r8a7794",
550 		.data = &usbhs_rcar_gen2_plat_info,
551 	},
552 	{
553 		.compatible = "renesas,usbhs-r8a7795",
554 		.data = &usbhs_rcar_gen3_plat_info,
555 	},
556 	{
557 		.compatible = "renesas,usbhs-r8a7796",
558 		.data = &usbhs_rcar_gen3_plat_info,
559 	},
560 	{
561 		.compatible = "renesas,usbhs-r8a77990",
562 		.data = &usbhs_rcar_gen3_with_pll_plat_info,
563 	},
564 	{
565 		.compatible = "renesas,usbhs-r8a77995",
566 		.data = &usbhs_rcar_gen3_with_pll_plat_info,
567 	},
568 	{
569 		.compatible = "renesas,rcar-gen2-usbhs",
570 		.data = &usbhs_rcar_gen2_plat_info,
571 	},
572 	{
573 		.compatible = "renesas,rcar-gen3-usbhs",
574 		.data = &usbhs_rcar_gen3_plat_info,
575 	},
576 	{
577 		.compatible = "renesas,rza1-usbhs",
578 		.data = &usbhs_rza1_plat_info,
579 	},
580 	{
581 		.compatible = "renesas,rza2-usbhs",
582 		.data = &usbhs_rza2_plat_info,
583 	},
584 	{ },
585 };
586 MODULE_DEVICE_TABLE(of, usbhs_of_match);
587 
588 static int usbhs_probe(struct platform_device *pdev)
589 {
590 	const struct renesas_usbhs_platform_info *info;
591 	struct usbhs_priv *priv;
592 	struct device *dev = &pdev->dev;
593 	struct gpio_desc *gpiod;
594 	int ret;
595 	u32 tmp;
596 	int irq;
597 
598 	/* check device node */
599 	if (dev_of_node(dev))
600 		info = of_device_get_match_data(dev);
601 	else
602 		info = renesas_usbhs_get_info(pdev);
603 
604 	/* check platform information */
605 	if (!info) {
606 		dev_err(dev, "no platform information\n");
607 		return -EINVAL;
608 	}
609 
610 	/* platform data */
611 	irq = platform_get_irq(pdev, 0);
612 	if (irq < 0)
613 		return irq;
614 
615 	/* usb private data */
616 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
617 	if (!priv)
618 		return -ENOMEM;
619 
620 	priv->base = devm_platform_ioremap_resource(pdev, 0);
621 	if (IS_ERR(priv->base))
622 		return PTR_ERR(priv->base);
623 
624 	if (of_property_read_bool(dev_of_node(dev), "extcon")) {
625 		priv->edev = extcon_get_edev_by_phandle(dev, 0);
626 		if (IS_ERR(priv->edev))
627 			return PTR_ERR(priv->edev);
628 	}
629 
630 	priv->rsts = devm_reset_control_array_get_optional_shared(dev);
631 	if (IS_ERR(priv->rsts))
632 		return PTR_ERR(priv->rsts);
633 
634 	/*
635 	 * care platform info
636 	 */
637 
638 	priv->dparam = info->driver_param;
639 
640 	if (!info->platform_callback.get_id) {
641 		dev_err(dev, "no platform callbacks\n");
642 		return -EINVAL;
643 	}
644 	priv->pfunc = &info->platform_callback;
645 
646 	/* set default param if platform doesn't have */
647 	if (usbhs_get_dparam(priv, has_new_pipe_configs)) {
648 		priv->dparam.pipe_configs = usbhsc_new_pipe;
649 		priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_new_pipe);
650 	} else if (!priv->dparam.pipe_configs) {
651 		priv->dparam.pipe_configs = usbhsc_default_pipe;
652 		priv->dparam.pipe_size = ARRAY_SIZE(usbhsc_default_pipe);
653 	}
654 	if (!priv->dparam.pio_dma_border)
655 		priv->dparam.pio_dma_border = 64; /* 64byte */
656 	if (!of_property_read_u32(dev_of_node(dev), "renesas,buswait", &tmp))
657 		priv->dparam.buswait_bwait = tmp;
658 	gpiod = devm_gpiod_get_optional(dev, "renesas,enable", GPIOD_IN);
659 	if (IS_ERR(gpiod))
660 		return PTR_ERR(gpiod);
661 
662 	/* FIXME */
663 	/* runtime power control ? */
664 	if (priv->pfunc->get_vbus)
665 		usbhs_get_dparam(priv, runtime_pwctrl) = 1;
666 
667 	/*
668 	 * priv settings
669 	 */
670 	priv->irq = irq;
671 	priv->pdev	= pdev;
672 	INIT_DELAYED_WORK(&priv->notify_hotplug_work, usbhsc_notify_hotplug);
673 	spin_lock_init(usbhs_priv_to_lock(priv));
674 
675 	/* call pipe and module init */
676 	ret = usbhs_pipe_probe(priv);
677 	if (ret < 0)
678 		return ret;
679 
680 	ret = usbhs_fifo_probe(priv);
681 	if (ret < 0)
682 		goto probe_end_pipe_exit;
683 
684 	ret = usbhs_mod_probe(priv);
685 	if (ret < 0)
686 		goto probe_end_fifo_exit;
687 
688 	/* dev_set_drvdata should be called after usbhs_mod_init */
689 	platform_set_drvdata(pdev, priv);
690 
691 	ret = reset_control_deassert(priv->rsts);
692 	if (ret)
693 		goto probe_fail_rst;
694 
695 	ret = usbhsc_clk_get(dev, priv);
696 	if (ret)
697 		goto probe_fail_clks;
698 
699 	/*
700 	 * deviece reset here because
701 	 * USB device might be used in boot loader.
702 	 */
703 	usbhs_sys_clock_ctrl(priv, 0);
704 
705 	/* check GPIO determining if USB function should be enabled */
706 	if (gpiod) {
707 		ret = !gpiod_get_value(gpiod);
708 		if (ret) {
709 			dev_warn(dev, "USB function not selected (GPIO)\n");
710 			ret = -ENOTSUPP;
711 			goto probe_end_mod_exit;
712 		}
713 	}
714 
715 	/*
716 	 * platform call
717 	 *
718 	 * USB phy setup might depend on CPU/Board.
719 	 * If platform has its callback functions,
720 	 * call it here.
721 	 */
722 	ret = usbhs_platform_call(priv, hardware_init, pdev);
723 	if (ret < 0) {
724 		dev_err(dev, "platform init failed.\n");
725 		goto probe_end_mod_exit;
726 	}
727 
728 	/* reset phy for connection */
729 	usbhs_platform_call(priv, phy_reset, pdev);
730 
731 	/* power control */
732 	pm_runtime_enable(dev);
733 	if (!usbhs_get_dparam(priv, runtime_pwctrl)) {
734 		usbhsc_power_ctrl(priv, 1);
735 		usbhs_mod_autonomy_mode(priv);
736 	} else {
737 		usbhs_mod_non_autonomy_mode(priv);
738 	}
739 
740 	/*
741 	 * manual call notify_hotplug for cold plug
742 	 */
743 	usbhsc_schedule_notify_hotplug(pdev);
744 
745 	dev_info(dev, "probed\n");
746 
747 	return ret;
748 
749 probe_end_mod_exit:
750 	usbhsc_clk_put(priv);
751 probe_fail_clks:
752 	reset_control_assert(priv->rsts);
753 probe_fail_rst:
754 	usbhs_mod_remove(priv);
755 probe_end_fifo_exit:
756 	usbhs_fifo_remove(priv);
757 probe_end_pipe_exit:
758 	usbhs_pipe_remove(priv);
759 
760 	dev_info(dev, "probe failed (%d)\n", ret);
761 
762 	return ret;
763 }
764 
765 static void usbhs_remove(struct platform_device *pdev)
766 {
767 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
768 
769 	dev_dbg(&pdev->dev, "usb remove\n");
770 
771 	/* power off */
772 	if (!usbhs_get_dparam(priv, runtime_pwctrl))
773 		usbhsc_power_ctrl(priv, 0);
774 
775 	pm_runtime_disable(&pdev->dev);
776 
777 	usbhs_platform_call(priv, hardware_exit, pdev);
778 	usbhsc_clk_put(priv);
779 	reset_control_assert(priv->rsts);
780 	usbhs_mod_remove(priv);
781 	usbhs_fifo_remove(priv);
782 	usbhs_pipe_remove(priv);
783 }
784 
785 static __maybe_unused int usbhsc_suspend(struct device *dev)
786 {
787 	struct usbhs_priv *priv = dev_get_drvdata(dev);
788 	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
789 
790 	if (mod) {
791 		usbhs_mod_call(priv, stop, priv);
792 		usbhs_mod_change(priv, -1);
793 	}
794 
795 	if (mod || !usbhs_get_dparam(priv, runtime_pwctrl))
796 		usbhsc_power_ctrl(priv, 0);
797 
798 	return 0;
799 }
800 
801 static __maybe_unused int usbhsc_resume(struct device *dev)
802 {
803 	struct usbhs_priv *priv = dev_get_drvdata(dev);
804 	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
805 
806 	if (!usbhs_get_dparam(priv, runtime_pwctrl)) {
807 		usbhsc_power_ctrl(priv, 1);
808 		usbhs_mod_autonomy_mode(priv);
809 	}
810 
811 	usbhs_platform_call(priv, phy_reset, pdev);
812 
813 	usbhsc_schedule_notify_hotplug(pdev);
814 
815 	return 0;
816 }
817 
818 static SIMPLE_DEV_PM_OPS(usbhsc_pm_ops, usbhsc_suspend, usbhsc_resume);
819 
820 static struct platform_driver renesas_usbhs_driver = {
821 	.driver		= {
822 		.name	= "renesas_usbhs",
823 		.pm	= &usbhsc_pm_ops,
824 		.of_match_table = usbhs_of_match,
825 	},
826 	.probe		= usbhs_probe,
827 	.remove_new	= usbhs_remove,
828 };
829 
830 module_platform_driver(renesas_usbhs_driver);
831 
832 MODULE_LICENSE("GPL");
833 MODULE_DESCRIPTION("Renesas USB driver");
834 MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
835