1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Allwinner sun4i USB phy driver
4  *
5  * Copyright (C) 2014-2015 Hans de Goede <hdegoede@redhat.com>
6  *
7  * Based on code from
8  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
9  *
10  * Modelled after: Samsung S5P/Exynos SoC series MIPI CSIS/DSIM DPHY driver
11  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
12  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
13  */
14 
15 #include <linux/clk.h>
16 #include <linux/delay.h>
17 #include <linux/err.h>
18 #include <linux/extcon-provider.h>
19 #include <linux/gpio/consumer.h>
20 #include <linux/io.h>
21 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/mutex.h>
25 #include <linux/of.h>
26 #include <linux/of_address.h>
27 #include <linux/of_device.h>
28 #include <linux/of_gpio.h>
29 #include <linux/phy/phy.h>
30 #include <linux/phy/phy-sun4i-usb.h>
31 #include <linux/platform_device.h>
32 #include <linux/power_supply.h>
33 #include <linux/regulator/consumer.h>
34 #include <linux/reset.h>
35 #include <linux/spinlock.h>
36 #include <linux/usb/of.h>
37 #include <linux/workqueue.h>
38 
39 #define REG_ISCR			0x00
40 #define REG_PHYCTL_A10			0x04
41 #define REG_PHYBIST			0x08
42 #define REG_PHYTUNE			0x0c
43 #define REG_PHYCTL_A33			0x10
44 #define REG_PHY_OTGCTL			0x20
45 
46 #define REG_HCI_PHY_CTL			0x10
47 
48 #define PHYCTL_DATA			BIT(7)
49 
50 #define OTGCTL_ROUTE_MUSB		BIT(0)
51 
52 #define SUNXI_AHB_ICHR8_EN		BIT(10)
53 #define SUNXI_AHB_INCR4_BURST_EN	BIT(9)
54 #define SUNXI_AHB_INCRX_ALIGN_EN	BIT(8)
55 #define SUNXI_ULPI_BYPASS_EN		BIT(0)
56 
57 /* ISCR, Interface Status and Control bits */
58 #define ISCR_ID_PULLUP_EN		(1 << 17)
59 #define ISCR_DPDM_PULLUP_EN	(1 << 16)
60 /* sunxi has the phy id/vbus pins not connected, so we use the force bits */
61 #define ISCR_FORCE_ID_MASK	(3 << 14)
62 #define ISCR_FORCE_ID_LOW		(2 << 14)
63 #define ISCR_FORCE_ID_HIGH	(3 << 14)
64 #define ISCR_FORCE_VBUS_MASK	(3 << 12)
65 #define ISCR_FORCE_VBUS_LOW	(2 << 12)
66 #define ISCR_FORCE_VBUS_HIGH	(3 << 12)
67 
68 /* Common Control Bits for Both PHYs */
69 #define PHY_PLL_BW			0x03
70 #define PHY_RES45_CAL_EN		0x0c
71 
72 /* Private Control Bits for Each PHY */
73 #define PHY_TX_AMPLITUDE_TUNE		0x20
74 #define PHY_TX_SLEWRATE_TUNE		0x22
75 #define PHY_VBUSVALID_TH_SEL		0x25
76 #define PHY_PULLUP_RES_SEL		0x27
77 #define PHY_OTG_FUNC_EN			0x28
78 #define PHY_VBUS_DET_EN			0x29
79 #define PHY_DISCON_TH_SEL		0x2a
80 #define PHY_SQUELCH_DETECT		0x3c
81 
82 /* A83T specific control bits for PHY0 */
83 #define PHY_CTL_VBUSVLDEXT		BIT(5)
84 #define PHY_CTL_SIDDQ			BIT(3)
85 #define PHY_CTL_H3_SIDDQ		BIT(1)
86 
87 /* A83T specific control bits for PHY2 HSIC */
88 #define SUNXI_EHCI_HS_FORCE		BIT(20)
89 #define SUNXI_HSIC_CONNECT_DET		BIT(17)
90 #define SUNXI_HSIC_CONNECT_INT		BIT(16)
91 #define SUNXI_HSIC			BIT(1)
92 
93 #define MAX_PHYS			4
94 
95 /*
96  * Note do not raise the debounce time, we must report Vusb high within 100ms
97  * otherwise we get Vbus errors
98  */
99 #define DEBOUNCE_TIME			msecs_to_jiffies(50)
100 #define POLL_TIME			msecs_to_jiffies(250)
101 
102 enum sun4i_usb_phy_type {
103 	sun4i_a10_phy,
104 	sun6i_a31_phy,
105 	sun8i_a33_phy,
106 	sun8i_a83t_phy,
107 	sun8i_h3_phy,
108 	sun8i_r40_phy,
109 	sun8i_v3s_phy,
110 	sun50i_a64_phy,
111 	sun50i_h6_phy,
112 };
113 
114 struct sun4i_usb_phy_cfg {
115 	int num_phys;
116 	int hsic_index;
117 	enum sun4i_usb_phy_type type;
118 	u32 disc_thresh;
119 	u32 hci_phy_ctl_clear;
120 	u8 phyctl_offset;
121 	bool dedicated_clocks;
122 	bool phy0_dual_route;
123 	int missing_phys;
124 };
125 
126 struct sun4i_usb_phy_data {
127 	void __iomem *base;
128 	const struct sun4i_usb_phy_cfg *cfg;
129 	enum usb_dr_mode dr_mode;
130 	spinlock_t reg_lock; /* guard access to phyctl reg */
131 	struct sun4i_usb_phy {
132 		struct phy *phy;
133 		void __iomem *pmu;
134 		struct regulator *vbus;
135 		struct reset_control *reset;
136 		struct clk *clk;
137 		struct clk *clk2;
138 		bool regulator_on;
139 		int index;
140 	} phys[MAX_PHYS];
141 	/* phy0 / otg related variables */
142 	struct extcon_dev *extcon;
143 	bool phy0_init;
144 	struct gpio_desc *id_det_gpio;
145 	struct gpio_desc *vbus_det_gpio;
146 	struct power_supply *vbus_power_supply;
147 	struct notifier_block vbus_power_nb;
148 	bool vbus_power_nb_registered;
149 	bool force_session_end;
150 	int id_det_irq;
151 	int vbus_det_irq;
152 	int id_det;
153 	int vbus_det;
154 	struct delayed_work detect;
155 };
156 
157 #define to_sun4i_usb_phy_data(phy) \
158 	container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index])
159 
sun4i_usb_phy0_update_iscr(struct phy * _phy,u32 clr,u32 set)160 static void sun4i_usb_phy0_update_iscr(struct phy *_phy, u32 clr, u32 set)
161 {
162 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
163 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
164 	u32 iscr;
165 
166 	iscr = readl(data->base + REG_ISCR);
167 	iscr &= ~clr;
168 	iscr |= set;
169 	writel(iscr, data->base + REG_ISCR);
170 }
171 
sun4i_usb_phy0_set_id_detect(struct phy * phy,u32 val)172 static void sun4i_usb_phy0_set_id_detect(struct phy *phy, u32 val)
173 {
174 	if (val)
175 		val = ISCR_FORCE_ID_HIGH;
176 	else
177 		val = ISCR_FORCE_ID_LOW;
178 
179 	sun4i_usb_phy0_update_iscr(phy, ISCR_FORCE_ID_MASK, val);
180 }
181 
sun4i_usb_phy0_set_vbus_detect(struct phy * phy,u32 val)182 static void sun4i_usb_phy0_set_vbus_detect(struct phy *phy, u32 val)
183 {
184 	if (val)
185 		val = ISCR_FORCE_VBUS_HIGH;
186 	else
187 		val = ISCR_FORCE_VBUS_LOW;
188 
189 	sun4i_usb_phy0_update_iscr(phy, ISCR_FORCE_VBUS_MASK, val);
190 }
191 
sun4i_usb_phy_write(struct sun4i_usb_phy * phy,u32 addr,u32 data,int len)192 static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data,
193 				int len)
194 {
195 	struct sun4i_usb_phy_data *phy_data = to_sun4i_usb_phy_data(phy);
196 	u32 temp, usbc_bit = BIT(phy->index * 2);
197 	void __iomem *phyctl = phy_data->base + phy_data->cfg->phyctl_offset;
198 	unsigned long flags;
199 	int i;
200 
201 	spin_lock_irqsave(&phy_data->reg_lock, flags);
202 
203 	if (phy_data->cfg->phyctl_offset == REG_PHYCTL_A33) {
204 		/* SoCs newer than A33 need us to set phyctl to 0 explicitly */
205 		writel(0, phyctl);
206 	}
207 
208 	for (i = 0; i < len; i++) {
209 		temp = readl(phyctl);
210 
211 		/* clear the address portion */
212 		temp &= ~(0xff << 8);
213 
214 		/* set the address */
215 		temp |= ((addr + i) << 8);
216 		writel(temp, phyctl);
217 
218 		/* set the data bit and clear usbc bit*/
219 		temp = readb(phyctl);
220 		if (data & 0x1)
221 			temp |= PHYCTL_DATA;
222 		else
223 			temp &= ~PHYCTL_DATA;
224 		temp &= ~usbc_bit;
225 		writeb(temp, phyctl);
226 
227 		/* pulse usbc_bit */
228 		temp = readb(phyctl);
229 		temp |= usbc_bit;
230 		writeb(temp, phyctl);
231 
232 		temp = readb(phyctl);
233 		temp &= ~usbc_bit;
234 		writeb(temp, phyctl);
235 
236 		data >>= 1;
237 	}
238 
239 	spin_unlock_irqrestore(&phy_data->reg_lock, flags);
240 }
241 
sun4i_usb_phy_passby(struct sun4i_usb_phy * phy,int enable)242 static void sun4i_usb_phy_passby(struct sun4i_usb_phy *phy, int enable)
243 {
244 	struct sun4i_usb_phy_data *phy_data = to_sun4i_usb_phy_data(phy);
245 	u32 bits, reg_value;
246 
247 	if (!phy->pmu)
248 		return;
249 
250 	bits = SUNXI_AHB_ICHR8_EN | SUNXI_AHB_INCR4_BURST_EN |
251 		SUNXI_AHB_INCRX_ALIGN_EN | SUNXI_ULPI_BYPASS_EN;
252 
253 	/* A83T USB2 is HSIC */
254 	if (phy_data->cfg->type == sun8i_a83t_phy && phy->index == 2)
255 		bits |= SUNXI_EHCI_HS_FORCE | SUNXI_HSIC_CONNECT_INT |
256 			SUNXI_HSIC;
257 
258 	reg_value = readl(phy->pmu);
259 
260 	if (enable)
261 		reg_value |= bits;
262 	else
263 		reg_value &= ~bits;
264 
265 	writel(reg_value, phy->pmu);
266 }
267 
sun4i_usb_phy_init(struct phy * _phy)268 static int sun4i_usb_phy_init(struct phy *_phy)
269 {
270 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
271 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
272 	int ret;
273 	u32 val;
274 
275 	ret = clk_prepare_enable(phy->clk);
276 	if (ret)
277 		return ret;
278 
279 	ret = clk_prepare_enable(phy->clk2);
280 	if (ret) {
281 		clk_disable_unprepare(phy->clk);
282 		return ret;
283 	}
284 
285 	ret = reset_control_deassert(phy->reset);
286 	if (ret) {
287 		clk_disable_unprepare(phy->clk2);
288 		clk_disable_unprepare(phy->clk);
289 		return ret;
290 	}
291 
292 	if (phy->pmu && data->cfg->hci_phy_ctl_clear) {
293 		val = readl(phy->pmu + REG_HCI_PHY_CTL);
294 		val &= ~data->cfg->hci_phy_ctl_clear;
295 		writel(val, phy->pmu + REG_HCI_PHY_CTL);
296 	}
297 
298 	if (data->cfg->type == sun8i_a83t_phy ||
299 	    data->cfg->type == sun50i_h6_phy) {
300 		if (phy->index == 0) {
301 			val = readl(data->base + data->cfg->phyctl_offset);
302 			val |= PHY_CTL_VBUSVLDEXT;
303 			val &= ~PHY_CTL_SIDDQ;
304 			writel(val, data->base + data->cfg->phyctl_offset);
305 		}
306 	} else {
307 		/* Enable USB 45 Ohm resistor calibration */
308 		if (phy->index == 0)
309 			sun4i_usb_phy_write(phy, PHY_RES45_CAL_EN, 0x01, 1);
310 
311 		/* Adjust PHY's magnitude and rate */
312 		sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
313 
314 		/* Disconnect threshold adjustment */
315 		sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL,
316 				    data->cfg->disc_thresh, 2);
317 	}
318 
319 	sun4i_usb_phy_passby(phy, 1);
320 
321 	if (phy->index == 0) {
322 		data->phy0_init = true;
323 
324 		/* Enable pull-ups */
325 		sun4i_usb_phy0_update_iscr(_phy, 0, ISCR_DPDM_PULLUP_EN);
326 		sun4i_usb_phy0_update_iscr(_phy, 0, ISCR_ID_PULLUP_EN);
327 
328 		/* Force ISCR and cable state updates */
329 		data->id_det = -1;
330 		data->vbus_det = -1;
331 		queue_delayed_work(system_wq, &data->detect, 0);
332 	}
333 
334 	return 0;
335 }
336 
sun4i_usb_phy_exit(struct phy * _phy)337 static int sun4i_usb_phy_exit(struct phy *_phy)
338 {
339 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
340 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
341 
342 	if (phy->index == 0) {
343 		if (data->cfg->type == sun8i_a83t_phy ||
344 		    data->cfg->type == sun50i_h6_phy) {
345 			void __iomem *phyctl = data->base +
346 				data->cfg->phyctl_offset;
347 
348 			writel(readl(phyctl) | PHY_CTL_SIDDQ, phyctl);
349 		}
350 
351 		/* Disable pull-ups */
352 		sun4i_usb_phy0_update_iscr(_phy, ISCR_DPDM_PULLUP_EN, 0);
353 		sun4i_usb_phy0_update_iscr(_phy, ISCR_ID_PULLUP_EN, 0);
354 		data->phy0_init = false;
355 	}
356 
357 	sun4i_usb_phy_passby(phy, 0);
358 	reset_control_assert(phy->reset);
359 	clk_disable_unprepare(phy->clk2);
360 	clk_disable_unprepare(phy->clk);
361 
362 	return 0;
363 }
364 
sun4i_usb_phy0_get_id_det(struct sun4i_usb_phy_data * data)365 static int sun4i_usb_phy0_get_id_det(struct sun4i_usb_phy_data *data)
366 {
367 	switch (data->dr_mode) {
368 	case USB_DR_MODE_OTG:
369 		if (data->id_det_gpio)
370 			return gpiod_get_value_cansleep(data->id_det_gpio);
371 		else
372 			return 1; /* Fallback to peripheral mode */
373 	case USB_DR_MODE_HOST:
374 		return 0;
375 	case USB_DR_MODE_PERIPHERAL:
376 	default:
377 		return 1;
378 	}
379 }
380 
sun4i_usb_phy0_get_vbus_det(struct sun4i_usb_phy_data * data)381 static int sun4i_usb_phy0_get_vbus_det(struct sun4i_usb_phy_data *data)
382 {
383 	if (data->vbus_det_gpio)
384 		return gpiod_get_value_cansleep(data->vbus_det_gpio);
385 
386 	if (data->vbus_power_supply) {
387 		union power_supply_propval val;
388 		int r;
389 
390 		r = power_supply_get_property(data->vbus_power_supply,
391 					      POWER_SUPPLY_PROP_PRESENT, &val);
392 		if (r == 0)
393 			return val.intval;
394 	}
395 
396 	/* Fallback: report vbus as high */
397 	return 1;
398 }
399 
sun4i_usb_phy0_have_vbus_det(struct sun4i_usb_phy_data * data)400 static bool sun4i_usb_phy0_have_vbus_det(struct sun4i_usb_phy_data *data)
401 {
402 	return data->vbus_det_gpio || data->vbus_power_supply;
403 }
404 
sun4i_usb_phy0_poll(struct sun4i_usb_phy_data * data)405 static bool sun4i_usb_phy0_poll(struct sun4i_usb_phy_data *data)
406 {
407 	if ((data->id_det_gpio && data->id_det_irq <= 0) ||
408 	    (data->vbus_det_gpio && data->vbus_det_irq <= 0))
409 		return true;
410 
411 	/*
412 	 * The A31/A23/A33 companion pmics (AXP221/AXP223) do not
413 	 * generate vbus change interrupts when the board is driving
414 	 * vbus using the N_VBUSEN pin on the pmic, so we must poll
415 	 * when using the pmic for vbus-det _and_ we're driving vbus.
416 	 */
417 	if ((data->cfg->type == sun6i_a31_phy ||
418 	     data->cfg->type == sun8i_a33_phy) &&
419 	    data->vbus_power_supply && data->phys[0].regulator_on)
420 		return true;
421 
422 	return false;
423 }
424 
sun4i_usb_phy_power_on(struct phy * _phy)425 static int sun4i_usb_phy_power_on(struct phy *_phy)
426 {
427 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
428 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
429 	int ret;
430 
431 	if (!phy->vbus || phy->regulator_on)
432 		return 0;
433 
434 	/* For phy0 only turn on Vbus if we don't have an ext. Vbus */
435 	if (phy->index == 0 && sun4i_usb_phy0_have_vbus_det(data) &&
436 				data->vbus_det) {
437 		dev_warn(&_phy->dev, "External vbus detected, not enabling our own vbus\n");
438 		return 0;
439 	}
440 
441 	ret = regulator_enable(phy->vbus);
442 	if (ret)
443 		return ret;
444 
445 	phy->regulator_on = true;
446 
447 	/* We must report Vbus high within OTG_TIME_A_WAIT_VRISE msec. */
448 	if (phy->index == 0 && sun4i_usb_phy0_poll(data))
449 		mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
450 
451 	return 0;
452 }
453 
sun4i_usb_phy_power_off(struct phy * _phy)454 static int sun4i_usb_phy_power_off(struct phy *_phy)
455 {
456 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
457 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
458 
459 	if (!phy->vbus || !phy->regulator_on)
460 		return 0;
461 
462 	regulator_disable(phy->vbus);
463 	phy->regulator_on = false;
464 
465 	/*
466 	 * phy0 vbus typically slowly discharges, sometimes this causes the
467 	 * Vbus gpio to not trigger an edge irq on Vbus off, so force a rescan.
468 	 */
469 	if (phy->index == 0 && !sun4i_usb_phy0_poll(data))
470 		mod_delayed_work(system_wq, &data->detect, POLL_TIME);
471 
472 	return 0;
473 }
474 
sun4i_usb_phy_set_mode(struct phy * _phy,enum phy_mode mode,int submode)475 static int sun4i_usb_phy_set_mode(struct phy *_phy,
476 				  enum phy_mode mode, int submode)
477 {
478 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
479 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
480 	int new_mode;
481 
482 	if (phy->index != 0) {
483 		if (mode == PHY_MODE_USB_HOST)
484 			return 0;
485 		return -EINVAL;
486 	}
487 
488 	switch (mode) {
489 	case PHY_MODE_USB_HOST:
490 		new_mode = USB_DR_MODE_HOST;
491 		break;
492 	case PHY_MODE_USB_DEVICE:
493 		new_mode = USB_DR_MODE_PERIPHERAL;
494 		break;
495 	case PHY_MODE_USB_OTG:
496 		new_mode = USB_DR_MODE_OTG;
497 		break;
498 	default:
499 		return -EINVAL;
500 	}
501 
502 	if (new_mode != data->dr_mode) {
503 		dev_info(&_phy->dev, "Changing dr_mode to %d\n", new_mode);
504 		data->dr_mode = new_mode;
505 	}
506 
507 	data->id_det = -1; /* Force reprocessing of id */
508 	data->force_session_end = true;
509 	queue_delayed_work(system_wq, &data->detect, 0);
510 
511 	return 0;
512 }
513 
sun4i_usb_phy_set_squelch_detect(struct phy * _phy,bool enabled)514 void sun4i_usb_phy_set_squelch_detect(struct phy *_phy, bool enabled)
515 {
516 	struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
517 
518 	sun4i_usb_phy_write(phy, PHY_SQUELCH_DETECT, enabled ? 0 : 2, 2);
519 }
520 EXPORT_SYMBOL_GPL(sun4i_usb_phy_set_squelch_detect);
521 
522 static const struct phy_ops sun4i_usb_phy_ops = {
523 	.init		= sun4i_usb_phy_init,
524 	.exit		= sun4i_usb_phy_exit,
525 	.power_on	= sun4i_usb_phy_power_on,
526 	.power_off	= sun4i_usb_phy_power_off,
527 	.set_mode	= sun4i_usb_phy_set_mode,
528 	.owner		= THIS_MODULE,
529 };
530 
sun4i_usb_phy0_reroute(struct sun4i_usb_phy_data * data,int id_det)531 static void sun4i_usb_phy0_reroute(struct sun4i_usb_phy_data *data, int id_det)
532 {
533 	u32 regval;
534 
535 	regval = readl(data->base + REG_PHY_OTGCTL);
536 	if (id_det == 0) {
537 		/* Host mode. Route phy0 to EHCI/OHCI */
538 		regval &= ~OTGCTL_ROUTE_MUSB;
539 	} else {
540 		/* Peripheral mode. Route phy0 to MUSB */
541 		regval |= OTGCTL_ROUTE_MUSB;
542 	}
543 	writel(regval, data->base + REG_PHY_OTGCTL);
544 }
545 
sun4i_usb_phy0_id_vbus_det_scan(struct work_struct * work)546 static void sun4i_usb_phy0_id_vbus_det_scan(struct work_struct *work)
547 {
548 	struct sun4i_usb_phy_data *data =
549 		container_of(work, struct sun4i_usb_phy_data, detect.work);
550 	struct phy *phy0 = data->phys[0].phy;
551 	struct sun4i_usb_phy *phy;
552 	bool force_session_end, id_notify = false, vbus_notify = false;
553 	int id_det, vbus_det;
554 
555 	if (!phy0)
556 		return;
557 
558 	phy = phy_get_drvdata(phy0);
559 	id_det = sun4i_usb_phy0_get_id_det(data);
560 	vbus_det = sun4i_usb_phy0_get_vbus_det(data);
561 
562 	mutex_lock(&phy0->mutex);
563 
564 	if (!data->phy0_init) {
565 		mutex_unlock(&phy0->mutex);
566 		return;
567 	}
568 
569 	force_session_end = data->force_session_end;
570 	data->force_session_end = false;
571 
572 	if (id_det != data->id_det) {
573 		/* id-change, force session end if we've no vbus detection */
574 		if (data->dr_mode == USB_DR_MODE_OTG &&
575 		    !sun4i_usb_phy0_have_vbus_det(data))
576 			force_session_end = true;
577 
578 		/* When entering host mode (id = 0) force end the session now */
579 		if (force_session_end && id_det == 0) {
580 			sun4i_usb_phy0_set_vbus_detect(phy0, 0);
581 			msleep(200);
582 			sun4i_usb_phy0_set_vbus_detect(phy0, 1);
583 		}
584 		sun4i_usb_phy0_set_id_detect(phy0, id_det);
585 		data->id_det = id_det;
586 		id_notify = true;
587 	}
588 
589 	if (vbus_det != data->vbus_det) {
590 		sun4i_usb_phy0_set_vbus_detect(phy0, vbus_det);
591 		data->vbus_det = vbus_det;
592 		vbus_notify = true;
593 	}
594 
595 	mutex_unlock(&phy0->mutex);
596 
597 	if (id_notify) {
598 		extcon_set_state_sync(data->extcon, EXTCON_USB_HOST,
599 					!id_det);
600 		/* When leaving host mode force end the session here */
601 		if (force_session_end && id_det == 1) {
602 			mutex_lock(&phy0->mutex);
603 			sun4i_usb_phy0_set_vbus_detect(phy0, 0);
604 			msleep(1000);
605 			sun4i_usb_phy0_set_vbus_detect(phy0, 1);
606 			mutex_unlock(&phy0->mutex);
607 		}
608 
609 		/* Enable PHY0 passby for host mode only. */
610 		sun4i_usb_phy_passby(phy, !id_det);
611 
612 		/* Re-route PHY0 if necessary */
613 		if (data->cfg->phy0_dual_route)
614 			sun4i_usb_phy0_reroute(data, id_det);
615 	}
616 
617 	if (vbus_notify)
618 		extcon_set_state_sync(data->extcon, EXTCON_USB, vbus_det);
619 
620 	if (sun4i_usb_phy0_poll(data))
621 		queue_delayed_work(system_wq, &data->detect, POLL_TIME);
622 }
623 
sun4i_usb_phy0_id_vbus_det_irq(int irq,void * dev_id)624 static irqreturn_t sun4i_usb_phy0_id_vbus_det_irq(int irq, void *dev_id)
625 {
626 	struct sun4i_usb_phy_data *data = dev_id;
627 
628 	/* vbus or id changed, let the pins settle and then scan them */
629 	mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
630 
631 	return IRQ_HANDLED;
632 }
633 
sun4i_usb_phy0_vbus_notify(struct notifier_block * nb,unsigned long val,void * v)634 static int sun4i_usb_phy0_vbus_notify(struct notifier_block *nb,
635 				      unsigned long val, void *v)
636 {
637 	struct sun4i_usb_phy_data *data =
638 		container_of(nb, struct sun4i_usb_phy_data, vbus_power_nb);
639 	struct power_supply *psy = v;
640 
641 	/* Properties on the vbus_power_supply changed, scan vbus_det */
642 	if (val == PSY_EVENT_PROP_CHANGED && psy == data->vbus_power_supply)
643 		mod_delayed_work(system_wq, &data->detect, DEBOUNCE_TIME);
644 
645 	return NOTIFY_OK;
646 }
647 
sun4i_usb_phy_xlate(struct device * dev,struct of_phandle_args * args)648 static struct phy *sun4i_usb_phy_xlate(struct device *dev,
649 					struct of_phandle_args *args)
650 {
651 	struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
652 
653 	if (args->args[0] >= data->cfg->num_phys)
654 		return ERR_PTR(-ENODEV);
655 
656 	if (data->cfg->missing_phys & BIT(args->args[0]))
657 		return ERR_PTR(-ENODEV);
658 
659 	return data->phys[args->args[0]].phy;
660 }
661 
sun4i_usb_phy_remove(struct platform_device * pdev)662 static int sun4i_usb_phy_remove(struct platform_device *pdev)
663 {
664 	struct device *dev = &pdev->dev;
665 	struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
666 
667 	if (data->vbus_power_nb_registered)
668 		power_supply_unreg_notifier(&data->vbus_power_nb);
669 	if (data->id_det_irq > 0)
670 		devm_free_irq(dev, data->id_det_irq, data);
671 	if (data->vbus_det_irq > 0)
672 		devm_free_irq(dev, data->vbus_det_irq, data);
673 
674 	cancel_delayed_work_sync(&data->detect);
675 
676 	return 0;
677 }
678 
679 static const unsigned int sun4i_usb_phy0_cable[] = {
680 	EXTCON_USB,
681 	EXTCON_USB_HOST,
682 	EXTCON_NONE,
683 };
684 
sun4i_usb_phy_probe(struct platform_device * pdev)685 static int sun4i_usb_phy_probe(struct platform_device *pdev)
686 {
687 	struct sun4i_usb_phy_data *data;
688 	struct device *dev = &pdev->dev;
689 	struct device_node *np = dev->of_node;
690 	struct phy_provider *phy_provider;
691 	int i, ret;
692 
693 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
694 	if (!data)
695 		return -ENOMEM;
696 
697 	spin_lock_init(&data->reg_lock);
698 	INIT_DELAYED_WORK(&data->detect, sun4i_usb_phy0_id_vbus_det_scan);
699 	dev_set_drvdata(dev, data);
700 	data->cfg = of_device_get_match_data(dev);
701 	if (!data->cfg)
702 		return -EINVAL;
703 
704 	data->base = devm_platform_ioremap_resource_byname(pdev, "phy_ctrl");
705 	if (IS_ERR(data->base))
706 		return PTR_ERR(data->base);
707 
708 	data->id_det_gpio = devm_gpiod_get_optional(dev, "usb0_id_det",
709 						    GPIOD_IN);
710 	if (IS_ERR(data->id_det_gpio)) {
711 		dev_err(dev, "Couldn't request ID GPIO\n");
712 		return PTR_ERR(data->id_det_gpio);
713 	}
714 
715 	data->vbus_det_gpio = devm_gpiod_get_optional(dev, "usb0_vbus_det",
716 						      GPIOD_IN);
717 	if (IS_ERR(data->vbus_det_gpio)) {
718 		dev_err(dev, "Couldn't request VBUS detect GPIO\n");
719 		return PTR_ERR(data->vbus_det_gpio);
720 	}
721 
722 	if (of_find_property(np, "usb0_vbus_power-supply", NULL)) {
723 		data->vbus_power_supply = devm_power_supply_get_by_phandle(dev,
724 						     "usb0_vbus_power-supply");
725 		if (IS_ERR(data->vbus_power_supply)) {
726 			dev_err(dev, "Couldn't get the VBUS power supply\n");
727 			return PTR_ERR(data->vbus_power_supply);
728 		}
729 
730 		if (!data->vbus_power_supply)
731 			return -EPROBE_DEFER;
732 	}
733 
734 	data->dr_mode = of_usb_get_dr_mode_by_phy(np, 0);
735 
736 	data->extcon = devm_extcon_dev_allocate(dev, sun4i_usb_phy0_cable);
737 	if (IS_ERR(data->extcon)) {
738 		dev_err(dev, "Couldn't allocate our extcon device\n");
739 		return PTR_ERR(data->extcon);
740 	}
741 
742 	ret = devm_extcon_dev_register(dev, data->extcon);
743 	if (ret) {
744 		dev_err(dev, "failed to register extcon: %d\n", ret);
745 		return ret;
746 	}
747 
748 	for (i = 0; i < data->cfg->num_phys; i++) {
749 		struct sun4i_usb_phy *phy = data->phys + i;
750 		char name[16];
751 
752 		if (data->cfg->missing_phys & BIT(i))
753 			continue;
754 
755 		snprintf(name, sizeof(name), "usb%d_vbus", i);
756 		phy->vbus = devm_regulator_get_optional(dev, name);
757 		if (IS_ERR(phy->vbus)) {
758 			if (PTR_ERR(phy->vbus) == -EPROBE_DEFER) {
759 				dev_err(dev,
760 					"Couldn't get regulator %s... Deferring probe\n",
761 					name);
762 				return -EPROBE_DEFER;
763 			}
764 
765 			phy->vbus = NULL;
766 		}
767 
768 		if (data->cfg->dedicated_clocks)
769 			snprintf(name, sizeof(name), "usb%d_phy", i);
770 		else
771 			strlcpy(name, "usb_phy", sizeof(name));
772 
773 		phy->clk = devm_clk_get(dev, name);
774 		if (IS_ERR(phy->clk)) {
775 			dev_err(dev, "failed to get clock %s\n", name);
776 			return PTR_ERR(phy->clk);
777 		}
778 
779 		/* The first PHY is always tied to OTG, and never HSIC */
780 		if (data->cfg->hsic_index && i == data->cfg->hsic_index) {
781 			/* HSIC needs secondary clock */
782 			snprintf(name, sizeof(name), "usb%d_hsic_12M", i);
783 			phy->clk2 = devm_clk_get(dev, name);
784 			if (IS_ERR(phy->clk2)) {
785 				dev_err(dev, "failed to get clock %s\n", name);
786 				return PTR_ERR(phy->clk2);
787 			}
788 		}
789 
790 		snprintf(name, sizeof(name), "usb%d_reset", i);
791 		phy->reset = devm_reset_control_get(dev, name);
792 		if (IS_ERR(phy->reset)) {
793 			dev_err(dev, "failed to get reset %s\n", name);
794 			return PTR_ERR(phy->reset);
795 		}
796 
797 		if (i || data->cfg->phy0_dual_route) { /* No pmu for musb */
798 			snprintf(name, sizeof(name), "pmu%d", i);
799 			phy->pmu = devm_platform_ioremap_resource_byname(pdev, name);
800 			if (IS_ERR(phy->pmu))
801 				return PTR_ERR(phy->pmu);
802 		}
803 
804 		phy->phy = devm_phy_create(dev, NULL, &sun4i_usb_phy_ops);
805 		if (IS_ERR(phy->phy)) {
806 			dev_err(dev, "failed to create PHY %d\n", i);
807 			return PTR_ERR(phy->phy);
808 		}
809 
810 		phy->index = i;
811 		phy_set_drvdata(phy->phy, &data->phys[i]);
812 	}
813 
814 	data->id_det_irq = gpiod_to_irq(data->id_det_gpio);
815 	if (data->id_det_irq > 0) {
816 		ret = devm_request_irq(dev, data->id_det_irq,
817 				sun4i_usb_phy0_id_vbus_det_irq,
818 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
819 				"usb0-id-det", data);
820 		if (ret) {
821 			dev_err(dev, "Err requesting id-det-irq: %d\n", ret);
822 			return ret;
823 		}
824 	}
825 
826 	data->vbus_det_irq = gpiod_to_irq(data->vbus_det_gpio);
827 	if (data->vbus_det_irq > 0) {
828 		ret = devm_request_irq(dev, data->vbus_det_irq,
829 				sun4i_usb_phy0_id_vbus_det_irq,
830 				IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
831 				"usb0-vbus-det", data);
832 		if (ret) {
833 			dev_err(dev, "Err requesting vbus-det-irq: %d\n", ret);
834 			data->vbus_det_irq = -1;
835 			sun4i_usb_phy_remove(pdev); /* Stop detect work */
836 			return ret;
837 		}
838 	}
839 
840 	if (data->vbus_power_supply) {
841 		data->vbus_power_nb.notifier_call = sun4i_usb_phy0_vbus_notify;
842 		data->vbus_power_nb.priority = 0;
843 		ret = power_supply_reg_notifier(&data->vbus_power_nb);
844 		if (ret) {
845 			sun4i_usb_phy_remove(pdev); /* Stop detect work */
846 			return ret;
847 		}
848 		data->vbus_power_nb_registered = true;
849 	}
850 
851 	phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate);
852 	if (IS_ERR(phy_provider)) {
853 		sun4i_usb_phy_remove(pdev); /* Stop detect work */
854 		return PTR_ERR(phy_provider);
855 	}
856 
857 	dev_dbg(dev, "successfully loaded\n");
858 
859 	return 0;
860 }
861 
862 static const struct sun4i_usb_phy_cfg sun4i_a10_cfg = {
863 	.num_phys = 3,
864 	.type = sun4i_a10_phy,
865 	.disc_thresh = 3,
866 	.phyctl_offset = REG_PHYCTL_A10,
867 	.dedicated_clocks = false,
868 };
869 
870 static const struct sun4i_usb_phy_cfg sun5i_a13_cfg = {
871 	.num_phys = 2,
872 	.type = sun4i_a10_phy,
873 	.disc_thresh = 2,
874 	.phyctl_offset = REG_PHYCTL_A10,
875 	.dedicated_clocks = false,
876 };
877 
878 static const struct sun4i_usb_phy_cfg sun6i_a31_cfg = {
879 	.num_phys = 3,
880 	.type = sun6i_a31_phy,
881 	.disc_thresh = 3,
882 	.phyctl_offset = REG_PHYCTL_A10,
883 	.dedicated_clocks = true,
884 };
885 
886 static const struct sun4i_usb_phy_cfg sun7i_a20_cfg = {
887 	.num_phys = 3,
888 	.type = sun4i_a10_phy,
889 	.disc_thresh = 2,
890 	.phyctl_offset = REG_PHYCTL_A10,
891 	.dedicated_clocks = false,
892 };
893 
894 static const struct sun4i_usb_phy_cfg sun8i_a23_cfg = {
895 	.num_phys = 2,
896 	.type = sun6i_a31_phy,
897 	.disc_thresh = 3,
898 	.phyctl_offset = REG_PHYCTL_A10,
899 	.dedicated_clocks = true,
900 };
901 
902 static const struct sun4i_usb_phy_cfg sun8i_a33_cfg = {
903 	.num_phys = 2,
904 	.type = sun8i_a33_phy,
905 	.disc_thresh = 3,
906 	.phyctl_offset = REG_PHYCTL_A33,
907 	.dedicated_clocks = true,
908 };
909 
910 static const struct sun4i_usb_phy_cfg sun8i_a83t_cfg = {
911 	.num_phys = 3,
912 	.hsic_index = 2,
913 	.type = sun8i_a83t_phy,
914 	.phyctl_offset = REG_PHYCTL_A33,
915 	.dedicated_clocks = true,
916 };
917 
918 static const struct sun4i_usb_phy_cfg sun8i_h3_cfg = {
919 	.num_phys = 4,
920 	.type = sun8i_h3_phy,
921 	.disc_thresh = 3,
922 	.phyctl_offset = REG_PHYCTL_A33,
923 	.dedicated_clocks = true,
924 	.hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
925 	.phy0_dual_route = true,
926 };
927 
928 static const struct sun4i_usb_phy_cfg sun8i_r40_cfg = {
929 	.num_phys = 3,
930 	.type = sun8i_r40_phy,
931 	.disc_thresh = 3,
932 	.phyctl_offset = REG_PHYCTL_A33,
933 	.dedicated_clocks = true,
934 	.hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
935 	.phy0_dual_route = true,
936 };
937 
938 static const struct sun4i_usb_phy_cfg sun8i_v3s_cfg = {
939 	.num_phys = 1,
940 	.type = sun8i_v3s_phy,
941 	.disc_thresh = 3,
942 	.phyctl_offset = REG_PHYCTL_A33,
943 	.dedicated_clocks = true,
944 	.hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
945 	.phy0_dual_route = true,
946 };
947 
948 static const struct sun4i_usb_phy_cfg sun20i_d1_cfg = {
949 	.num_phys = 2,
950 	.type = sun50i_h6_phy,
951 	.phyctl_offset = REG_PHYCTL_A33,
952 	.dedicated_clocks = true,
953 	.hci_phy_ctl_clear = PHY_CTL_SIDDQ,
954 	.phy0_dual_route = true,
955 };
956 
957 static const struct sun4i_usb_phy_cfg sun50i_a64_cfg = {
958 	.num_phys = 2,
959 	.type = sun50i_a64_phy,
960 	.disc_thresh = 3,
961 	.phyctl_offset = REG_PHYCTL_A33,
962 	.dedicated_clocks = true,
963 	.hci_phy_ctl_clear = PHY_CTL_H3_SIDDQ,
964 	.phy0_dual_route = true,
965 };
966 
967 static const struct sun4i_usb_phy_cfg sun50i_h6_cfg = {
968 	.num_phys = 4,
969 	.type = sun50i_h6_phy,
970 	.phyctl_offset = REG_PHYCTL_A33,
971 	.dedicated_clocks = true,
972 	.phy0_dual_route = true,
973 	.missing_phys = BIT(1) | BIT(2),
974 };
975 
976 static const struct of_device_id sun4i_usb_phy_of_match[] = {
977 	{ .compatible = "allwinner,sun4i-a10-usb-phy", .data = &sun4i_a10_cfg },
978 	{ .compatible = "allwinner,sun5i-a13-usb-phy", .data = &sun5i_a13_cfg },
979 	{ .compatible = "allwinner,sun6i-a31-usb-phy", .data = &sun6i_a31_cfg },
980 	{ .compatible = "allwinner,sun7i-a20-usb-phy", .data = &sun7i_a20_cfg },
981 	{ .compatible = "allwinner,sun8i-a23-usb-phy", .data = &sun8i_a23_cfg },
982 	{ .compatible = "allwinner,sun8i-a33-usb-phy", .data = &sun8i_a33_cfg },
983 	{ .compatible = "allwinner,sun8i-a83t-usb-phy", .data = &sun8i_a83t_cfg },
984 	{ .compatible = "allwinner,sun8i-h3-usb-phy", .data = &sun8i_h3_cfg },
985 	{ .compatible = "allwinner,sun8i-r40-usb-phy", .data = &sun8i_r40_cfg },
986 	{ .compatible = "allwinner,sun8i-v3s-usb-phy", .data = &sun8i_v3s_cfg },
987 	{ .compatible = "allwinner,sun20i-d1-usb-phy", .data = &sun20i_d1_cfg },
988 	{ .compatible = "allwinner,sun50i-a64-usb-phy",
989 	  .data = &sun50i_a64_cfg},
990 	{ .compatible = "allwinner,sun50i-h6-usb-phy", .data = &sun50i_h6_cfg },
991 	{ },
992 };
993 MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
994 
995 static struct platform_driver sun4i_usb_phy_driver = {
996 	.probe	= sun4i_usb_phy_probe,
997 	.remove	= sun4i_usb_phy_remove,
998 	.driver = {
999 		.of_match_table	= sun4i_usb_phy_of_match,
1000 		.name  = "sun4i-usb-phy",
1001 	}
1002 };
1003 module_platform_driver(sun4i_usb_phy_driver);
1004 
1005 MODULE_DESCRIPTION("Allwinner sun4i USB phy driver");
1006 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
1007 MODULE_LICENSE("GPL v2");
1008