1 // SPDX-License-Identifier: GPL-2.0-only
2 
3 #include <linux/clk.h>
4 #include <linux/err.h>
5 #include <linux/io.h>
6 #include <linux/module.h>
7 #include <linux/of.h>
8 #include <linux/phy/phy.h>
9 #include <linux/platform_device.h>
10 #include <linux/delay.h>
11 #include <linux/regmap.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/bitfield.h>
14 
15 /* USB QSCRATCH Hardware registers */
16 #define QSCRATCH_GENERAL_CFG		(0x08)
17 #define HSUSB_PHY_CTRL_REG		(0x10)
18 
19 /* PHY_CTRL_REG */
20 #define HSUSB_CTRL_DMSEHV_CLAMP		BIT(24)
21 #define HSUSB_CTRL_USB2_SUSPEND		BIT(23)
22 #define HSUSB_CTRL_UTMI_CLK_EN		BIT(21)
23 #define HSUSB_CTRL_UTMI_OTG_VBUS_VALID	BIT(20)
24 #define HSUSB_CTRL_USE_CLKCORE		BIT(18)
25 #define HSUSB_CTRL_DPSEHV_CLAMP		BIT(17)
26 #define HSUSB_CTRL_COMMONONN		BIT(11)
27 #define HSUSB_CTRL_ID_HV_CLAMP		BIT(9)
28 #define HSUSB_CTRL_OTGSESSVLD_CLAMP	BIT(8)
29 #define HSUSB_CTRL_CLAMP_EN		BIT(7)
30 #define HSUSB_CTRL_RETENABLEN		BIT(1)
31 #define HSUSB_CTRL_POR			BIT(0)
32 
33 /* QSCRATCH_GENERAL_CFG */
34 #define HSUSB_GCFG_XHCI_REV		BIT(2)
35 
36 /* USB QSCRATCH Hardware registers */
37 #define SSUSB_PHY_CTRL_REG		(0x00)
38 #define SSUSB_PHY_PARAM_CTRL_1		(0x04)
39 #define SSUSB_PHY_PARAM_CTRL_2		(0x08)
40 #define CR_PROTOCOL_DATA_IN_REG		(0x0c)
41 #define CR_PROTOCOL_DATA_OUT_REG	(0x10)
42 #define CR_PROTOCOL_CAP_ADDR_REG	(0x14)
43 #define CR_PROTOCOL_CAP_DATA_REG	(0x18)
44 #define CR_PROTOCOL_READ_REG		(0x1c)
45 #define CR_PROTOCOL_WRITE_REG		(0x20)
46 
47 /* PHY_CTRL_REG */
48 #define SSUSB_CTRL_REF_USE_PAD		BIT(28)
49 #define SSUSB_CTRL_TEST_POWERDOWN	BIT(27)
50 #define SSUSB_CTRL_LANE0_PWR_PRESENT	BIT(24)
51 #define SSUSB_CTRL_SS_PHY_EN		BIT(8)
52 #define SSUSB_CTRL_SS_PHY_RESET		BIT(7)
53 
54 /* SSPHY control registers - Does this need 0x30? */
55 #define SSPHY_CTRL_RX_OVRD_IN_HI(lane)	(0x1006 + 0x100 * (lane))
56 #define SSPHY_CTRL_TX_OVRD_DRV_LO(lane)	(0x1002 + 0x100 * (lane))
57 
58 /* SSPHY SoC version specific values */
59 #define SSPHY_RX_EQ_VALUE		4 /* Override value for rx_eq */
60 /* Override value for transmit preemphasis */
61 #define SSPHY_TX_DEEMPH_3_5DB		23
62 /* Override value for mpll */
63 #define SSPHY_MPLL_VALUE		0
64 
65 /* QSCRATCH PHY_PARAM_CTRL1 fields */
66 #define PHY_PARAM_CTRL1_TX_FULL_SWING_MASK	GENMASK(26, 19)
67 #define PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK	GENMASK(19, 13)
68 #define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK	GENMASK(13, 7)
69 #define PHY_PARAM_CTRL1_LOS_BIAS_MASK		GENMASK(7, 2)
70 
71 #define PHY_PARAM_CTRL1_MASK				\
72 		(PHY_PARAM_CTRL1_TX_FULL_SWING_MASK |	\
73 		 PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK |	\
74 		 PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK |	\
75 		 PHY_PARAM_CTRL1_LOS_BIAS_MASK)
76 
77 #define PHY_PARAM_CTRL1_TX_FULL_SWING(x)	\
78 		FIELD_PREP(PHY_PARAM_CTRL1_TX_FULL_SWING_MASK, (x))
79 #define PHY_PARAM_CTRL1_TX_DEEMPH_6DB(x)	\
80 		FIELD_PREP(PHY_PARAM_CTRL1_TX_DEEMPH_6DB_MASK, (x))
81 #define PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(x)	\
82 		FIELD_PREP(PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB_MASK, x)
83 #define PHY_PARAM_CTRL1_LOS_BIAS(x)	\
84 		FIELD_PREP(PHY_PARAM_CTRL1_LOS_BIAS_MASK, (x))
85 
86 /* RX OVRD IN HI bits */
87 #define RX_OVRD_IN_HI_RX_RESET_OVRD		BIT(13)
88 #define RX_OVRD_IN_HI_RX_RX_RESET		BIT(12)
89 #define RX_OVRD_IN_HI_RX_EQ_OVRD		BIT(11)
90 #define RX_OVRD_IN_HI_RX_EQ_MASK		GENMASK(10, 7)
91 #define RX_OVRD_IN_HI_RX_EQ(x)			FIELD_PREP(RX_OVRD_IN_HI_RX_EQ_MASK, (x))
92 #define RX_OVRD_IN_HI_RX_EQ_EN_OVRD		BIT(7)
93 #define RX_OVRD_IN_HI_RX_EQ_EN			BIT(6)
94 #define RX_OVRD_IN_HI_RX_LOS_FILTER_OVRD	BIT(5)
95 #define RX_OVRD_IN_HI_RX_LOS_FILTER_MASK	GENMASK(4, 2)
96 #define RX_OVRD_IN_HI_RX_RATE_OVRD		BIT(2)
97 #define RX_OVRD_IN_HI_RX_RATE_MASK		GENMASK(2, 0)
98 
99 /* TX OVRD DRV LO register bits */
100 #define TX_OVRD_DRV_LO_AMPLITUDE_MASK		GENMASK(6, 0)
101 #define TX_OVRD_DRV_LO_PREEMPH_MASK		GENMASK(13, 6)
102 #define TX_OVRD_DRV_LO_PREEMPH(x)		((x) << 7)
103 #define TX_OVRD_DRV_LO_EN			BIT(14)
104 
105 /* MPLL bits */
106 #define SSPHY_MPLL_MASK				GENMASK(8, 5)
107 #define SSPHY_MPLL(x)				((x) << 5)
108 
109 /* SS CAP register bits */
110 #define SS_CR_CAP_ADDR_REG			BIT(0)
111 #define SS_CR_CAP_DATA_REG			BIT(0)
112 #define SS_CR_READ_REG				BIT(0)
113 #define SS_CR_WRITE_REG				BIT(0)
114 
115 #define LATCH_SLEEP				40
116 #define LATCH_TIMEOUT				100
117 
118 struct usb_phy {
119 	void __iomem		*base;
120 	struct device		*dev;
121 	struct clk		*xo_clk;
122 	struct clk		*ref_clk;
123 	u32			rx_eq;
124 	u32			tx_deamp_3_5db;
125 	u32			mpll;
126 };
127 
128 struct phy_drvdata {
129 	struct phy_ops	ops;
130 	u32		clk_rate;
131 };
132 
133 /**
134  * usb_phy_write_readback() - Write register and read back masked value to
135  * confirm it is written
136  *
137  * @phy_dwc3: QCOM DWC3 phy context
138  * @offset: register offset.
139  * @mask: register bitmask specifying what should be updated
140  * @val: value to write.
141  */
usb_phy_write_readback(struct usb_phy * phy_dwc3,u32 offset,const u32 mask,u32 val)142 static inline void usb_phy_write_readback(struct usb_phy *phy_dwc3,
143 					  u32 offset,
144 					  const u32 mask, u32 val)
145 {
146 	u32 write_val, tmp = readl(phy_dwc3->base + offset);
147 
148 	tmp &= ~mask;		/* retain other bits */
149 	write_val = tmp | val;
150 
151 	writel(write_val, phy_dwc3->base + offset);
152 
153 	/* Read back to see if val was written */
154 	tmp = readl(phy_dwc3->base + offset);
155 	tmp &= mask;		/* clear other bits */
156 
157 	if (tmp != val)
158 		dev_err(phy_dwc3->dev, "write: %x to QSCRATCH: %x FAILED\n", val, offset);
159 }
160 
wait_for_latch(void __iomem * addr)161 static int wait_for_latch(void __iomem *addr)
162 {
163 	u32 val;
164 
165 	return readl_poll_timeout(addr, val, !val, LATCH_SLEEP, LATCH_TIMEOUT);
166 }
167 
168 /**
169  * usb_ss_write_phycreg() - Write SSPHY register
170  *
171  * @phy_dwc3: QCOM DWC3 phy context
172  * @addr: SSPHY address to write.
173  * @val: value to write.
174  */
usb_ss_write_phycreg(struct usb_phy * phy_dwc3,u32 addr,u32 val)175 static int usb_ss_write_phycreg(struct usb_phy *phy_dwc3,
176 				u32 addr, u32 val)
177 {
178 	int ret;
179 
180 	writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
181 	writel(SS_CR_CAP_ADDR_REG,
182 	       phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
183 
184 	ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
185 	if (ret)
186 		goto err_wait;
187 
188 	writel(val, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
189 	writel(SS_CR_CAP_DATA_REG,
190 	       phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
191 
192 	ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_DATA_REG);
193 	if (ret)
194 		goto err_wait;
195 
196 	writel(SS_CR_WRITE_REG, phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
197 
198 	ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_WRITE_REG);
199 
200 err_wait:
201 	if (ret)
202 		dev_err(phy_dwc3->dev, "timeout waiting for latch\n");
203 	return ret;
204 }
205 
206 /**
207  * usb_ss_read_phycreg() - Read SSPHY register.
208  *
209  * @phy_dwc3: QCOM DWC3 phy context
210  * @addr: SSPHY address to read.
211  * @val: pointer in which read is store.
212  */
usb_ss_read_phycreg(struct usb_phy * phy_dwc3,u32 addr,u32 * val)213 static int usb_ss_read_phycreg(struct usb_phy *phy_dwc3,
214 			       u32 addr, u32 *val)
215 {
216 	int ret;
217 
218 	writel(addr, phy_dwc3->base + CR_PROTOCOL_DATA_IN_REG);
219 	writel(SS_CR_CAP_ADDR_REG,
220 	       phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
221 
222 	ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_CAP_ADDR_REG);
223 	if (ret)
224 		goto err_wait;
225 
226 	/*
227 	 * Due to hardware bug, first read of SSPHY register might be
228 	 * incorrect. Hence as workaround, SW should perform SSPHY register
229 	 * read twice, but use only second read and ignore first read.
230 	 */
231 	writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
232 
233 	ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
234 	if (ret)
235 		goto err_wait;
236 
237 	/* throwaway read */
238 	readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
239 
240 	writel(SS_CR_READ_REG, phy_dwc3->base + CR_PROTOCOL_READ_REG);
241 
242 	ret = wait_for_latch(phy_dwc3->base + CR_PROTOCOL_READ_REG);
243 	if (ret)
244 		goto err_wait;
245 
246 	*val = readl(phy_dwc3->base + CR_PROTOCOL_DATA_OUT_REG);
247 
248 err_wait:
249 	return ret;
250 }
251 
qcom_ipq806x_usb_hs_phy_init(struct phy * phy)252 static int qcom_ipq806x_usb_hs_phy_init(struct phy *phy)
253 {
254 	struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
255 	int ret;
256 	u32 val;
257 
258 	ret = clk_prepare_enable(phy_dwc3->xo_clk);
259 	if (ret)
260 		return ret;
261 
262 	ret = clk_prepare_enable(phy_dwc3->ref_clk);
263 	if (ret) {
264 		clk_disable_unprepare(phy_dwc3->xo_clk);
265 		return ret;
266 	}
267 
268 	/*
269 	 * HSPHY Initialization: Enable UTMI clock, select 19.2MHz fsel
270 	 * enable clamping, and disable RETENTION (power-on default is ENABLED)
271 	 */
272 	val = HSUSB_CTRL_DPSEHV_CLAMP | HSUSB_CTRL_DMSEHV_CLAMP |
273 		HSUSB_CTRL_RETENABLEN  | HSUSB_CTRL_COMMONONN |
274 		HSUSB_CTRL_OTGSESSVLD_CLAMP | HSUSB_CTRL_ID_HV_CLAMP |
275 		HSUSB_CTRL_UTMI_OTG_VBUS_VALID | HSUSB_CTRL_UTMI_CLK_EN |
276 		HSUSB_CTRL_CLAMP_EN | 0x70;
277 
278 	/* use core clock if external reference is not present */
279 	if (!phy_dwc3->xo_clk)
280 		val |= HSUSB_CTRL_USE_CLKCORE;
281 
282 	writel(val, phy_dwc3->base + HSUSB_PHY_CTRL_REG);
283 	usleep_range(2000, 2200);
284 
285 	/* Disable (bypass) VBUS and ID filters */
286 	writel(HSUSB_GCFG_XHCI_REV, phy_dwc3->base + QSCRATCH_GENERAL_CFG);
287 
288 	return 0;
289 }
290 
qcom_ipq806x_usb_hs_phy_exit(struct phy * phy)291 static int qcom_ipq806x_usb_hs_phy_exit(struct phy *phy)
292 {
293 	struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
294 
295 	clk_disable_unprepare(phy_dwc3->ref_clk);
296 	clk_disable_unprepare(phy_dwc3->xo_clk);
297 
298 	return 0;
299 }
300 
qcom_ipq806x_usb_ss_phy_init(struct phy * phy)301 static int qcom_ipq806x_usb_ss_phy_init(struct phy *phy)
302 {
303 	struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
304 	int ret;
305 	u32 data;
306 
307 	ret = clk_prepare_enable(phy_dwc3->xo_clk);
308 	if (ret)
309 		return ret;
310 
311 	ret = clk_prepare_enable(phy_dwc3->ref_clk);
312 	if (ret) {
313 		clk_disable_unprepare(phy_dwc3->xo_clk);
314 		return ret;
315 	}
316 
317 	/* reset phy */
318 	data = readl(phy_dwc3->base + SSUSB_PHY_CTRL_REG);
319 	writel(data | SSUSB_CTRL_SS_PHY_RESET,
320 	       phy_dwc3->base + SSUSB_PHY_CTRL_REG);
321 	usleep_range(2000, 2200);
322 	writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
323 
324 	/* clear REF_PAD if we don't have XO clk */
325 	if (!phy_dwc3->xo_clk)
326 		data &= ~SSUSB_CTRL_REF_USE_PAD;
327 	else
328 		data |= SSUSB_CTRL_REF_USE_PAD;
329 
330 	writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
331 
332 	/* wait for ref clk to become stable, this can take up to 30ms */
333 	msleep(30);
334 
335 	data |= SSUSB_CTRL_SS_PHY_EN | SSUSB_CTRL_LANE0_PWR_PRESENT;
336 	writel(data, phy_dwc3->base + SSUSB_PHY_CTRL_REG);
337 
338 	/*
339 	 * WORKAROUND: There is SSPHY suspend bug due to which USB enumerates
340 	 * in HS mode instead of SS mode. Workaround it by asserting
341 	 * LANE0.TX_ALT_BLOCK.EN_ALT_BUS to enable TX to use alt bus mode
342 	 */
343 	ret = usb_ss_read_phycreg(phy_dwc3, 0x102D, &data);
344 	if (ret)
345 		goto err_phy_trans;
346 
347 	data |= (1 << 7);
348 	ret = usb_ss_write_phycreg(phy_dwc3, 0x102D, data);
349 	if (ret)
350 		goto err_phy_trans;
351 
352 	ret = usb_ss_read_phycreg(phy_dwc3, 0x1010, &data);
353 	if (ret)
354 		goto err_phy_trans;
355 
356 	data &= ~0xff0;
357 	data |= 0x20;
358 	ret = usb_ss_write_phycreg(phy_dwc3, 0x1010, data);
359 	if (ret)
360 		goto err_phy_trans;
361 
362 	/*
363 	 * Fix RX Equalization setting as follows
364 	 * LANE0.RX_OVRD_IN_HI. RX_EQ_EN set to 0
365 	 * LANE0.RX_OVRD_IN_HI.RX_EQ_EN_OVRD set to 1
366 	 * LANE0.RX_OVRD_IN_HI.RX_EQ set based on SoC version
367 	 * LANE0.RX_OVRD_IN_HI.RX_EQ_OVRD set to 1
368 	 */
369 	ret = usb_ss_read_phycreg(phy_dwc3, SSPHY_CTRL_RX_OVRD_IN_HI(0), &data);
370 	if (ret)
371 		goto err_phy_trans;
372 
373 	data &= ~RX_OVRD_IN_HI_RX_EQ_EN;
374 	data |= RX_OVRD_IN_HI_RX_EQ_EN_OVRD;
375 	data &= ~RX_OVRD_IN_HI_RX_EQ_MASK;
376 	data |= RX_OVRD_IN_HI_RX_EQ(phy_dwc3->rx_eq);
377 	data |= RX_OVRD_IN_HI_RX_EQ_OVRD;
378 	ret = usb_ss_write_phycreg(phy_dwc3,
379 				   SSPHY_CTRL_RX_OVRD_IN_HI(0), data);
380 	if (ret)
381 		goto err_phy_trans;
382 
383 	/*
384 	 * Set EQ and TX launch amplitudes as follows
385 	 * LANE0.TX_OVRD_DRV_LO.PREEMPH set based on SoC version
386 	 * LANE0.TX_OVRD_DRV_LO.AMPLITUDE set to 110
387 	 * LANE0.TX_OVRD_DRV_LO.EN set to 1.
388 	 */
389 	ret = usb_ss_read_phycreg(phy_dwc3,
390 				  SSPHY_CTRL_TX_OVRD_DRV_LO(0), &data);
391 	if (ret)
392 		goto err_phy_trans;
393 
394 	data &= ~TX_OVRD_DRV_LO_PREEMPH_MASK;
395 	data |= TX_OVRD_DRV_LO_PREEMPH(phy_dwc3->tx_deamp_3_5db);
396 	data &= ~TX_OVRD_DRV_LO_AMPLITUDE_MASK;
397 	data |= 0x6E;
398 	data |= TX_OVRD_DRV_LO_EN;
399 	ret = usb_ss_write_phycreg(phy_dwc3,
400 				   SSPHY_CTRL_TX_OVRD_DRV_LO(0), data);
401 	if (ret)
402 		goto err_phy_trans;
403 
404 	data = 0;
405 	data &= ~SSPHY_MPLL_MASK;
406 	data |= SSPHY_MPLL(phy_dwc3->mpll);
407 	usb_ss_write_phycreg(phy_dwc3, 0x30, data);
408 
409 	/*
410 	 * Set the QSCRATCH PHY_PARAM_CTRL1 parameters as follows
411 	 * TX_FULL_SWING [26:20] amplitude to 110
412 	 * TX_DEEMPH_6DB [19:14] to 32
413 	 * TX_DEEMPH_3_5DB [13:8] set based on SoC version
414 	 * LOS_BIAS [7:3] to 9
415 	 */
416 	data = readl(phy_dwc3->base + SSUSB_PHY_PARAM_CTRL_1);
417 
418 	data &= ~PHY_PARAM_CTRL1_MASK;
419 
420 	data |= PHY_PARAM_CTRL1_TX_FULL_SWING(0x6e) |
421 		PHY_PARAM_CTRL1_TX_DEEMPH_6DB(0x20) |
422 		PHY_PARAM_CTRL1_TX_DEEMPH_3_5DB(phy_dwc3->tx_deamp_3_5db) |
423 		PHY_PARAM_CTRL1_LOS_BIAS(0x9);
424 
425 	usb_phy_write_readback(phy_dwc3, SSUSB_PHY_PARAM_CTRL_1,
426 			       PHY_PARAM_CTRL1_MASK, data);
427 
428 err_phy_trans:
429 	return ret;
430 }
431 
qcom_ipq806x_usb_ss_phy_exit(struct phy * phy)432 static int qcom_ipq806x_usb_ss_phy_exit(struct phy *phy)
433 {
434 	struct usb_phy *phy_dwc3 = phy_get_drvdata(phy);
435 
436 	/* Sequence to put SSPHY in low power state:
437 	 * 1. Clear REF_PHY_EN in PHY_CTRL_REG
438 	 * 2. Clear REF_USE_PAD in PHY_CTRL_REG
439 	 * 3. Set TEST_POWERED_DOWN in PHY_CTRL_REG to enable PHY retention
440 	 */
441 	usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
442 			       SSUSB_CTRL_SS_PHY_EN, 0x0);
443 	usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
444 			       SSUSB_CTRL_REF_USE_PAD, 0x0);
445 	usb_phy_write_readback(phy_dwc3, SSUSB_PHY_CTRL_REG,
446 			       SSUSB_CTRL_TEST_POWERDOWN, 0x0);
447 
448 	clk_disable_unprepare(phy_dwc3->ref_clk);
449 	clk_disable_unprepare(phy_dwc3->xo_clk);
450 
451 	return 0;
452 }
453 
454 static const struct phy_drvdata qcom_ipq806x_usb_hs_drvdata = {
455 	.ops = {
456 		.init		= qcom_ipq806x_usb_hs_phy_init,
457 		.exit		= qcom_ipq806x_usb_hs_phy_exit,
458 		.owner		= THIS_MODULE,
459 	},
460 	.clk_rate = 60000000,
461 };
462 
463 static const struct phy_drvdata qcom_ipq806x_usb_ss_drvdata = {
464 	.ops = {
465 		.init		= qcom_ipq806x_usb_ss_phy_init,
466 		.exit		= qcom_ipq806x_usb_ss_phy_exit,
467 		.owner		= THIS_MODULE,
468 	},
469 	.clk_rate = 125000000,
470 };
471 
472 static const struct of_device_id qcom_ipq806x_usb_phy_table[] = {
473 	{ .compatible = "qcom,ipq806x-usb-phy-hs",
474 	  .data = &qcom_ipq806x_usb_hs_drvdata },
475 	{ .compatible = "qcom,ipq806x-usb-phy-ss",
476 	  .data = &qcom_ipq806x_usb_ss_drvdata },
477 	{ /* Sentinel */ }
478 };
479 MODULE_DEVICE_TABLE(of, qcom_ipq806x_usb_phy_table);
480 
qcom_ipq806x_usb_phy_probe(struct platform_device * pdev)481 static int qcom_ipq806x_usb_phy_probe(struct platform_device *pdev)
482 {
483 	struct resource *res;
484 	resource_size_t size;
485 	struct phy *generic_phy;
486 	struct usb_phy *phy_dwc3;
487 	const struct phy_drvdata *data;
488 	struct phy_provider *phy_provider;
489 
490 	phy_dwc3 = devm_kzalloc(&pdev->dev, sizeof(*phy_dwc3), GFP_KERNEL);
491 	if (!phy_dwc3)
492 		return -ENOMEM;
493 
494 	data = of_device_get_match_data(&pdev->dev);
495 
496 	phy_dwc3->dev = &pdev->dev;
497 
498 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
499 	if (!res)
500 		return -EINVAL;
501 	size = resource_size(res);
502 	phy_dwc3->base = devm_ioremap(phy_dwc3->dev, res->start, size);
503 
504 	if (!phy_dwc3->base) {
505 		dev_err(phy_dwc3->dev, "failed to map reg\n");
506 		return -ENOMEM;
507 	}
508 
509 	phy_dwc3->ref_clk = devm_clk_get(phy_dwc3->dev, "ref");
510 	if (IS_ERR(phy_dwc3->ref_clk)) {
511 		dev_dbg(phy_dwc3->dev, "cannot get reference clock\n");
512 		return PTR_ERR(phy_dwc3->ref_clk);
513 	}
514 
515 	clk_set_rate(phy_dwc3->ref_clk, data->clk_rate);
516 
517 	phy_dwc3->xo_clk = devm_clk_get(phy_dwc3->dev, "xo");
518 	if (IS_ERR(phy_dwc3->xo_clk)) {
519 		dev_dbg(phy_dwc3->dev, "cannot get TCXO clock\n");
520 		phy_dwc3->xo_clk = NULL;
521 	}
522 
523 	/* Parse device node to probe HSIO settings */
524 	if (device_property_read_u32(&pdev->dev, "qcom,rx-eq",
525 				     &phy_dwc3->rx_eq))
526 		phy_dwc3->rx_eq = SSPHY_RX_EQ_VALUE;
527 
528 	if (device_property_read_u32(&pdev->dev, "qcom,tx-deamp_3_5db",
529 				     &phy_dwc3->tx_deamp_3_5db))
530 		phy_dwc3->tx_deamp_3_5db = SSPHY_TX_DEEMPH_3_5DB;
531 
532 	if (device_property_read_u32(&pdev->dev, "qcom,mpll", &phy_dwc3->mpll))
533 		phy_dwc3->mpll = SSPHY_MPLL_VALUE;
534 
535 	generic_phy = devm_phy_create(phy_dwc3->dev, pdev->dev.of_node, &data->ops);
536 
537 	if (IS_ERR(generic_phy))
538 		return PTR_ERR(generic_phy);
539 
540 	phy_set_drvdata(generic_phy, phy_dwc3);
541 	platform_set_drvdata(pdev, phy_dwc3);
542 
543 	phy_provider = devm_of_phy_provider_register(phy_dwc3->dev,
544 						     of_phy_simple_xlate);
545 
546 	if (IS_ERR(phy_provider))
547 		return PTR_ERR(phy_provider);
548 
549 	return 0;
550 }
551 
552 static struct platform_driver qcom_ipq806x_usb_phy_driver = {
553 	.probe		= qcom_ipq806x_usb_phy_probe,
554 	.driver		= {
555 		.name	= "qcom-ipq806x-usb-phy",
556 		.of_match_table = qcom_ipq806x_usb_phy_table,
557 	},
558 };
559 
560 module_platform_driver(qcom_ipq806x_usb_phy_driver);
561 
562 MODULE_ALIAS("platform:phy-qcom-ipq806x-usb");
563 MODULE_LICENSE("GPL v2");
564 MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
565 MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>");
566 MODULE_DESCRIPTION("DesignWare USB3 QCOM PHY driver");
567