1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (c) 2017, 2019, The Linux Foundation. All rights reserved.
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/kernel.h>
11 #include <linux/mfd/syscon.h>
12 #include <linux/module.h>
13 #include <linux/nvmem-consumer.h>
14 #include <linux/of.h>
15 #include <linux/of_device.h>
16 #include <linux/phy/phy.h>
17 #include <linux/platform_device.h>
18 #include <linux/regmap.h>
19 #include <linux/regulator/consumer.h>
20 #include <linux/reset.h>
21 #include <linux/slab.h>
22 
23 #include <dt-bindings/phy/phy-qcom-qusb2.h>
24 
25 #define QUSB2PHY_PLL_TEST		0x04
26 #define CLK_REF_SEL			BIT(7)
27 
28 #define QUSB2PHY_PLL_TUNE		0x08
29 #define QUSB2PHY_PLL_USER_CTL1		0x0c
30 #define QUSB2PHY_PLL_USER_CTL2		0x10
31 #define QUSB2PHY_PLL_AUTOPGM_CTL1	0x1c
32 #define QUSB2PHY_PLL_PWR_CTRL		0x18
33 
34 /* QUSB2PHY_PLL_STATUS register bits */
35 #define PLL_LOCKED			BIT(5)
36 
37 /* QUSB2PHY_PLL_COMMON_STATUS_ONE register bits */
38 #define CORE_READY_STATUS		BIT(0)
39 
40 /* QUSB2PHY_PORT_POWERDOWN register bits */
41 #define CLAMP_N_EN			BIT(5)
42 #define FREEZIO_N			BIT(1)
43 #define POWER_DOWN			BIT(0)
44 
45 /* QUSB2PHY_PWR_CTRL1 register bits */
46 #define PWR_CTRL1_VREF_SUPPLY_TRIM	BIT(5)
47 #define PWR_CTRL1_CLAMP_N_EN		BIT(1)
48 
49 #define QUSB2PHY_REFCLK_ENABLE		BIT(0)
50 
51 #define PHY_CLK_SCHEME_SEL		BIT(0)
52 
53 /* QUSB2PHY_INTR_CTRL register bits */
54 #define DMSE_INTR_HIGH_SEL			BIT(4)
55 #define DPSE_INTR_HIGH_SEL			BIT(3)
56 #define CHG_DET_INTR_EN				BIT(2)
57 #define DMSE_INTR_EN				BIT(1)
58 #define DPSE_INTR_EN				BIT(0)
59 
60 /* QUSB2PHY_PLL_CORE_INPUT_OVERRIDE register bits */
61 #define CORE_PLL_EN_FROM_RESET			BIT(4)
62 #define CORE_RESET				BIT(5)
63 #define CORE_RESET_MUX				BIT(6)
64 
65 /* QUSB2PHY_IMP_CTRL1 register bits */
66 #define IMP_RES_OFFSET_MASK			GENMASK(5, 0)
67 #define IMP_RES_OFFSET_SHIFT			0x0
68 
69 /* QUSB2PHY_PLL_BIAS_CONTROL_2 register bits */
70 #define BIAS_CTRL2_RES_OFFSET_MASK		GENMASK(5, 0)
71 #define BIAS_CTRL2_RES_OFFSET_SHIFT		0x0
72 
73 /* QUSB2PHY_CHG_CONTROL_2 register bits */
74 #define CHG_CTRL2_OFFSET_MASK			GENMASK(5, 4)
75 #define CHG_CTRL2_OFFSET_SHIFT			0x4
76 
77 /* QUSB2PHY_PORT_TUNE1 register bits */
78 #define HSTX_TRIM_MASK				GENMASK(7, 4)
79 #define HSTX_TRIM_SHIFT				0x4
80 #define PREEMPH_WIDTH_HALF_BIT			BIT(2)
81 #define PREEMPHASIS_EN_MASK			GENMASK(1, 0)
82 #define PREEMPHASIS_EN_SHIFT			0x0
83 
84 /* QUSB2PHY_PORT_TUNE2 register bits */
85 #define HSDISC_TRIM_MASK			GENMASK(1, 0)
86 #define HSDISC_TRIM_SHIFT			0x0
87 
88 #define QUSB2PHY_PLL_ANALOG_CONTROLS_TWO	0x04
89 #define QUSB2PHY_PLL_CLOCK_INVERTERS		0x18c
90 #define QUSB2PHY_PLL_CMODE			0x2c
91 #define QUSB2PHY_PLL_LOCK_DELAY			0x184
92 #define QUSB2PHY_PLL_DIGITAL_TIMERS_TWO		0xb4
93 #define QUSB2PHY_PLL_BIAS_CONTROL_1		0x194
94 #define QUSB2PHY_PLL_BIAS_CONTROL_2		0x198
95 #define QUSB2PHY_PWR_CTRL2			0x214
96 #define QUSB2PHY_IMP_CTRL1			0x220
97 #define QUSB2PHY_IMP_CTRL2			0x224
98 #define QUSB2PHY_CHG_CTRL2			0x23c
99 
100 struct qusb2_phy_init_tbl {
101 	unsigned int offset;
102 	unsigned int val;
103 	/*
104 	 * register part of layout ?
105 	 * if yes, then offset gives index in the reg-layout
106 	 */
107 	int in_layout;
108 };
109 
110 #define QUSB2_PHY_INIT_CFG(o, v) \
111 	{			\
112 		.offset = o,	\
113 		.val = v,	\
114 	}
115 
116 #define QUSB2_PHY_INIT_CFG_L(o, v) \
117 	{			\
118 		.offset = o,	\
119 		.val = v,	\
120 		.in_layout = 1,	\
121 	}
122 
123 /* set of registers with offsets different per-PHY */
124 enum qusb2phy_reg_layout {
125 	QUSB2PHY_PLL_CORE_INPUT_OVERRIDE,
126 	QUSB2PHY_PLL_STATUS,
127 	QUSB2PHY_PORT_TUNE1,
128 	QUSB2PHY_PORT_TUNE2,
129 	QUSB2PHY_PORT_TUNE3,
130 	QUSB2PHY_PORT_TUNE4,
131 	QUSB2PHY_PORT_TUNE5,
132 	QUSB2PHY_PORT_TEST1,
133 	QUSB2PHY_PORT_TEST2,
134 	QUSB2PHY_PORT_POWERDOWN,
135 	QUSB2PHY_INTR_CTRL,
136 };
137 
138 static const unsigned int msm8996_regs_layout[] = {
139 	[QUSB2PHY_PLL_STATUS]		= 0x38,
140 	[QUSB2PHY_PORT_TUNE1]		= 0x80,
141 	[QUSB2PHY_PORT_TUNE2]		= 0x84,
142 	[QUSB2PHY_PORT_TUNE3]		= 0x88,
143 	[QUSB2PHY_PORT_TUNE4]		= 0x8c,
144 	[QUSB2PHY_PORT_TUNE5]		= 0x90,
145 	[QUSB2PHY_PORT_TEST1]		= 0xb8,
146 	[QUSB2PHY_PORT_TEST2]		= 0x9c,
147 	[QUSB2PHY_PORT_POWERDOWN]	= 0xb4,
148 	[QUSB2PHY_INTR_CTRL]		= 0xbc,
149 };
150 
151 static const struct qusb2_phy_init_tbl msm8996_init_tbl[] = {
152 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0xf8),
153 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0xb3),
154 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE3, 0x83),
155 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE4, 0xc0),
156 
157 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_TUNE, 0x30),
158 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL1, 0x79),
159 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL2, 0x21),
160 
161 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TEST2, 0x14),
162 
163 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_AUTOPGM_CTL1, 0x9f),
164 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_PWR_CTRL, 0x00),
165 };
166 
167 static const unsigned int msm8998_regs_layout[] = {
168 	[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE] = 0xa8,
169 	[QUSB2PHY_PLL_STATUS]              = 0x1a0,
170 	[QUSB2PHY_PORT_TUNE1]              = 0x23c,
171 	[QUSB2PHY_PORT_TUNE2]              = 0x240,
172 	[QUSB2PHY_PORT_TUNE3]              = 0x244,
173 	[QUSB2PHY_PORT_TUNE4]              = 0x248,
174 	[QUSB2PHY_PORT_TEST1]              = 0x24c,
175 	[QUSB2PHY_PORT_TEST2]              = 0x250,
176 	[QUSB2PHY_PORT_POWERDOWN]          = 0x210,
177 	[QUSB2PHY_INTR_CTRL]               = 0x22c,
178 };
179 
180 static const struct qusb2_phy_init_tbl msm8998_init_tbl[] = {
181 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_ANALOG_CONTROLS_TWO, 0x13),
182 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CLOCK_INVERTERS, 0x7c),
183 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CMODE, 0x80),
184 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_LOCK_DELAY, 0x0a),
185 
186 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0xa5),
187 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0x09),
188 
189 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_DIGITAL_TIMERS_TWO, 0x19),
190 };
191 
192 static const unsigned int qusb2_v2_regs_layout[] = {
193 	[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE] = 0xa8,
194 	[QUSB2PHY_PLL_STATUS]		= 0x1a0,
195 	[QUSB2PHY_PORT_TUNE1]		= 0x240,
196 	[QUSB2PHY_PORT_TUNE2]		= 0x244,
197 	[QUSB2PHY_PORT_TUNE3]		= 0x248,
198 	[QUSB2PHY_PORT_TUNE4]		= 0x24c,
199 	[QUSB2PHY_PORT_TUNE5]		= 0x250,
200 	[QUSB2PHY_PORT_TEST1]		= 0x254,
201 	[QUSB2PHY_PORT_TEST2]		= 0x258,
202 	[QUSB2PHY_PORT_POWERDOWN]	= 0x210,
203 	[QUSB2PHY_INTR_CTRL]		= 0x230,
204 };
205 
206 static const struct qusb2_phy_init_tbl qusb2_v2_init_tbl[] = {
207 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_ANALOG_CONTROLS_TWO, 0x03),
208 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CLOCK_INVERTERS, 0x7c),
209 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CMODE, 0x80),
210 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_LOCK_DELAY, 0x0a),
211 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_DIGITAL_TIMERS_TWO, 0x19),
212 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_BIAS_CONTROL_1, 0x40),
213 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_BIAS_CONTROL_2, 0x20),
214 	QUSB2_PHY_INIT_CFG(QUSB2PHY_PWR_CTRL2, 0x21),
215 	QUSB2_PHY_INIT_CFG(QUSB2PHY_IMP_CTRL1, 0x0),
216 	QUSB2_PHY_INIT_CFG(QUSB2PHY_IMP_CTRL2, 0x58),
217 
218 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0x30),
219 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0x29),
220 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE3, 0xca),
221 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE4, 0x04),
222 	QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE5, 0x03),
223 
224 	QUSB2_PHY_INIT_CFG(QUSB2PHY_CHG_CTRL2, 0x0),
225 };
226 
227 struct qusb2_phy_cfg {
228 	const struct qusb2_phy_init_tbl *tbl;
229 	/* number of entries in the table */
230 	unsigned int tbl_num;
231 	/* offset to PHY_CLK_SCHEME register in TCSR map */
232 	unsigned int clk_scheme_offset;
233 
234 	/* array of registers with different offsets */
235 	const unsigned int *regs;
236 	unsigned int mask_core_ready;
237 	unsigned int disable_ctrl;
238 	unsigned int autoresume_en;
239 
240 	/* true if PHY has PLL_TEST register to select clk_scheme */
241 	bool has_pll_test;
242 
243 	/* true if TUNE1 register must be updated by fused value, else TUNE2 */
244 	bool update_tune1_with_efuse;
245 
246 	/* true if PHY has PLL_CORE_INPUT_OVERRIDE register to reset PLL */
247 	bool has_pll_override;
248 };
249 
250 static const struct qusb2_phy_cfg msm8996_phy_cfg = {
251 	.tbl		= msm8996_init_tbl,
252 	.tbl_num	= ARRAY_SIZE(msm8996_init_tbl),
253 	.regs		= msm8996_regs_layout,
254 
255 	.has_pll_test	= true,
256 	.disable_ctrl	= (CLAMP_N_EN | FREEZIO_N | POWER_DOWN),
257 	.mask_core_ready = PLL_LOCKED,
258 	.autoresume_en	 = BIT(3),
259 };
260 
261 static const struct qusb2_phy_cfg msm8998_phy_cfg = {
262 	.tbl            = msm8998_init_tbl,
263 	.tbl_num        = ARRAY_SIZE(msm8998_init_tbl),
264 	.regs           = msm8998_regs_layout,
265 
266 	.disable_ctrl   = POWER_DOWN,
267 	.mask_core_ready = CORE_READY_STATUS,
268 	.has_pll_override = true,
269 	.autoresume_en   = BIT(0),
270 	.update_tune1_with_efuse = true,
271 };
272 
273 static const struct qusb2_phy_cfg qusb2_v2_phy_cfg = {
274 	.tbl		= qusb2_v2_init_tbl,
275 	.tbl_num	= ARRAY_SIZE(qusb2_v2_init_tbl),
276 	.regs		= qusb2_v2_regs_layout,
277 
278 	.disable_ctrl	= (PWR_CTRL1_VREF_SUPPLY_TRIM | PWR_CTRL1_CLAMP_N_EN |
279 			   POWER_DOWN),
280 	.mask_core_ready = CORE_READY_STATUS,
281 	.has_pll_override = true,
282 	.autoresume_en	  = BIT(0),
283 	.update_tune1_with_efuse = true,
284 };
285 
286 static const char * const qusb2_phy_vreg_names[] = {
287 	"vdda-pll", "vdda-phy-dpdm",
288 };
289 
290 #define QUSB2_NUM_VREGS		ARRAY_SIZE(qusb2_phy_vreg_names)
291 
292 /* struct override_param - structure holding qusb2 v2 phy overriding param
293  * set override true if the  device tree property exists and read and assign
294  * to value
295  */
296 struct override_param {
297 	bool override;
298 	u8 value;
299 };
300 
301 /*struct override_params - structure holding qusb2 v2 phy overriding params
302  * @imp_res_offset: rescode offset to be updated in IMP_CTRL1 register
303  * @hstx_trim: HSTX_TRIM to be updated in TUNE1 register
304  * @preemphasis: Amplitude Pre-Emphasis to be updated in TUNE1 register
305  * @preemphasis_width: half/full-width Pre-Emphasis updated via TUNE1
306  * @bias_ctrl: bias ctrl to be updated in BIAS_CONTROL_2 register
307  * @charge_ctrl: charge ctrl to be updated in CHG_CTRL2 register
308  * @hsdisc_trim: disconnect threshold to be updated in TUNE2 register
309  */
310 struct override_params {
311 	struct override_param imp_res_offset;
312 	struct override_param hstx_trim;
313 	struct override_param preemphasis;
314 	struct override_param preemphasis_width;
315 	struct override_param bias_ctrl;
316 	struct override_param charge_ctrl;
317 	struct override_param hsdisc_trim;
318 };
319 
320 /**
321  * struct qusb2_phy - structure holding qusb2 phy attributes
322  *
323  * @phy: generic phy
324  * @base: iomapped memory space for qubs2 phy
325  *
326  * @cfg_ahb_clk: AHB2PHY interface clock
327  * @ref_clk: phy reference clock
328  * @iface_clk: phy interface clock
329  * @phy_reset: phy reset control
330  * @vregs: regulator supplies bulk data
331  *
332  * @tcsr: TCSR syscon register map
333  * @cell: nvmem cell containing phy tuning value
334  *
335  * @overrides: pointer to structure for all overriding tuning params
336  *
337  * @cfg: phy config data
338  * @has_se_clk_scheme: indicate if PHY has single-ended ref clock scheme
339  * @phy_initialized: indicate if PHY has been initialized
340  * @mode: current PHY mode
341  */
342 struct qusb2_phy {
343 	struct phy *phy;
344 	void __iomem *base;
345 
346 	struct clk *cfg_ahb_clk;
347 	struct clk *ref_clk;
348 	struct clk *iface_clk;
349 	struct reset_control *phy_reset;
350 	struct regulator_bulk_data vregs[QUSB2_NUM_VREGS];
351 
352 	struct regmap *tcsr;
353 	struct nvmem_cell *cell;
354 
355 	struct override_params overrides;
356 
357 	const struct qusb2_phy_cfg *cfg;
358 	bool has_se_clk_scheme;
359 	bool phy_initialized;
360 	enum phy_mode mode;
361 };
362 
363 static inline void qusb2_write_mask(void __iomem *base, u32 offset,
364 				    u32 val, u32 mask)
365 {
366 	u32 reg;
367 
368 	reg = readl(base + offset);
369 	reg &= ~mask;
370 	reg |= val & mask;
371 	writel(reg, base + offset);
372 
373 	/* Ensure above write is completed */
374 	readl(base + offset);
375 }
376 
377 static inline void qusb2_setbits(void __iomem *base, u32 offset, u32 val)
378 {
379 	u32 reg;
380 
381 	reg = readl(base + offset);
382 	reg |= val;
383 	writel(reg, base + offset);
384 
385 	/* Ensure above write is completed */
386 	readl(base + offset);
387 }
388 
389 static inline void qusb2_clrbits(void __iomem *base, u32 offset, u32 val)
390 {
391 	u32 reg;
392 
393 	reg = readl(base + offset);
394 	reg &= ~val;
395 	writel(reg, base + offset);
396 
397 	/* Ensure above write is completed */
398 	readl(base + offset);
399 }
400 
401 static inline
402 void qcom_qusb2_phy_configure(void __iomem *base,
403 			      const unsigned int *regs,
404 			      const struct qusb2_phy_init_tbl tbl[], int num)
405 {
406 	int i;
407 
408 	for (i = 0; i < num; i++) {
409 		if (tbl[i].in_layout)
410 			writel(tbl[i].val, base + regs[tbl[i].offset]);
411 		else
412 			writel(tbl[i].val, base + tbl[i].offset);
413 	}
414 }
415 
416 /*
417  * Update board specific PHY tuning override values if specified from
418  * device tree.
419  */
420 static void qusb2_phy_override_phy_params(struct qusb2_phy *qphy)
421 {
422 	const struct qusb2_phy_cfg *cfg = qphy->cfg;
423 	struct override_params *or = &qphy->overrides;
424 
425 	if (or->imp_res_offset.override)
426 		qusb2_write_mask(qphy->base, QUSB2PHY_IMP_CTRL1,
427 		or->imp_res_offset.value << IMP_RES_OFFSET_SHIFT,
428 			     IMP_RES_OFFSET_MASK);
429 
430 	if (or->bias_ctrl.override)
431 		qusb2_write_mask(qphy->base, QUSB2PHY_PLL_BIAS_CONTROL_2,
432 		or->bias_ctrl.value << BIAS_CTRL2_RES_OFFSET_SHIFT,
433 			   BIAS_CTRL2_RES_OFFSET_MASK);
434 
435 	if (or->charge_ctrl.override)
436 		qusb2_write_mask(qphy->base, QUSB2PHY_CHG_CTRL2,
437 		or->charge_ctrl.value << CHG_CTRL2_OFFSET_SHIFT,
438 			     CHG_CTRL2_OFFSET_MASK);
439 
440 	if (or->hstx_trim.override)
441 		qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE1],
442 		or->hstx_trim.value << HSTX_TRIM_SHIFT,
443 				 HSTX_TRIM_MASK);
444 
445 	if (or->preemphasis.override)
446 		qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE1],
447 		or->preemphasis.value << PREEMPHASIS_EN_SHIFT,
448 				PREEMPHASIS_EN_MASK);
449 
450 	if (or->preemphasis_width.override) {
451 		if (or->preemphasis_width.value ==
452 		    QUSB2_V2_PREEMPHASIS_WIDTH_HALF_BIT)
453 			qusb2_setbits(qphy->base,
454 				      cfg->regs[QUSB2PHY_PORT_TUNE1],
455 				      PREEMPH_WIDTH_HALF_BIT);
456 		else
457 			qusb2_clrbits(qphy->base,
458 				      cfg->regs[QUSB2PHY_PORT_TUNE1],
459 				      PREEMPH_WIDTH_HALF_BIT);
460 	}
461 
462 	if (or->hsdisc_trim.override)
463 		qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE2],
464 		or->hsdisc_trim.value << HSDISC_TRIM_SHIFT,
465 				 HSDISC_TRIM_MASK);
466 }
467 
468 /*
469  * Fetches HS Tx tuning value from nvmem and sets the
470  * QUSB2PHY_PORT_TUNE1/2 register.
471  * For error case, skip setting the value and use the default value.
472  */
473 static void qusb2_phy_set_tune2_param(struct qusb2_phy *qphy)
474 {
475 	struct device *dev = &qphy->phy->dev;
476 	const struct qusb2_phy_cfg *cfg = qphy->cfg;
477 	u8 *val;
478 
479 	/* efuse register is optional */
480 	if (!qphy->cell)
481 		return;
482 
483 	/*
484 	 * Read efuse register having TUNE2/1 parameter's high nibble.
485 	 * If efuse register shows value as 0x0 (indicating value is not
486 	 * fused), or if we fail to find a valid efuse register setting,
487 	 * then use default value for high nibble that we have already
488 	 * set while configuring the phy.
489 	 */
490 	val = nvmem_cell_read(qphy->cell, NULL);
491 	if (IS_ERR(val) || !val[0]) {
492 		dev_dbg(dev, "failed to read a valid hs-tx trim value\n");
493 		return;
494 	}
495 
496 	/* Fused TUNE1/2 value is the higher nibble only */
497 	if (cfg->update_tune1_with_efuse)
498 		qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE1],
499 				 val[0] << HSTX_TRIM_SHIFT,
500 				 HSTX_TRIM_MASK);
501 	else
502 		qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE2],
503 				 val[0] << HSTX_TRIM_SHIFT,
504 				 HSTX_TRIM_MASK);
505 }
506 
507 static int qusb2_phy_set_mode(struct phy *phy,
508 			      enum phy_mode mode, int submode)
509 {
510 	struct qusb2_phy *qphy = phy_get_drvdata(phy);
511 
512 	qphy->mode = mode;
513 
514 	return 0;
515 }
516 
517 static int __maybe_unused qusb2_phy_runtime_suspend(struct device *dev)
518 {
519 	struct qusb2_phy *qphy = dev_get_drvdata(dev);
520 	const struct qusb2_phy_cfg *cfg = qphy->cfg;
521 	u32 intr_mask;
522 
523 	dev_vdbg(dev, "Suspending QUSB2 Phy, mode:%d\n", qphy->mode);
524 
525 	if (!qphy->phy_initialized) {
526 		dev_vdbg(dev, "PHY not initialized, bailing out\n");
527 		return 0;
528 	}
529 
530 	/*
531 	 * Enable DP/DM interrupts to detect line state changes based on current
532 	 * speed. In other words, enable the triggers _opposite_ of what the
533 	 * current D+/D- levels are e.g. if currently D+ high, D- low
534 	 * (HS 'J'/Suspend), configure the mask to trigger on D+ low OR D- high
535 	 */
536 	intr_mask = DPSE_INTR_EN | DMSE_INTR_EN;
537 	switch (qphy->mode) {
538 	case PHY_MODE_USB_HOST_HS:
539 	case PHY_MODE_USB_HOST_FS:
540 	case PHY_MODE_USB_DEVICE_HS:
541 	case PHY_MODE_USB_DEVICE_FS:
542 		intr_mask |= DMSE_INTR_HIGH_SEL;
543 		break;
544 	case PHY_MODE_USB_HOST_LS:
545 	case PHY_MODE_USB_DEVICE_LS:
546 		intr_mask |= DPSE_INTR_HIGH_SEL;
547 		break;
548 	default:
549 		/* No device connected, enable both DP/DM high interrupt */
550 		intr_mask |= DMSE_INTR_HIGH_SEL;
551 		intr_mask |= DPSE_INTR_HIGH_SEL;
552 		break;
553 	}
554 
555 	writel(intr_mask, qphy->base + cfg->regs[QUSB2PHY_INTR_CTRL]);
556 
557 	/* hold core PLL into reset */
558 	if (cfg->has_pll_override) {
559 		qusb2_setbits(qphy->base,
560 			      cfg->regs[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE],
561 			      CORE_PLL_EN_FROM_RESET | CORE_RESET |
562 			      CORE_RESET_MUX);
563 	}
564 
565 	/* enable phy auto-resume only if device is connected on bus */
566 	if (qphy->mode != PHY_MODE_INVALID) {
567 		qusb2_setbits(qphy->base, cfg->regs[QUSB2PHY_PORT_TEST1],
568 			      cfg->autoresume_en);
569 		/* Autoresume bit has to be toggled in order to enable it */
570 		qusb2_clrbits(qphy->base, cfg->regs[QUSB2PHY_PORT_TEST1],
571 			      cfg->autoresume_en);
572 	}
573 
574 	if (!qphy->has_se_clk_scheme)
575 		clk_disable_unprepare(qphy->ref_clk);
576 
577 	clk_disable_unprepare(qphy->cfg_ahb_clk);
578 	clk_disable_unprepare(qphy->iface_clk);
579 
580 	return 0;
581 }
582 
583 static int __maybe_unused qusb2_phy_runtime_resume(struct device *dev)
584 {
585 	struct qusb2_phy *qphy = dev_get_drvdata(dev);
586 	const struct qusb2_phy_cfg *cfg = qphy->cfg;
587 	int ret;
588 
589 	dev_vdbg(dev, "Resuming QUSB2 phy, mode:%d\n", qphy->mode);
590 
591 	if (!qphy->phy_initialized) {
592 		dev_vdbg(dev, "PHY not initialized, bailing out\n");
593 		return 0;
594 	}
595 
596 	ret = clk_prepare_enable(qphy->iface_clk);
597 	if (ret) {
598 		dev_err(dev, "failed to enable iface_clk, %d\n", ret);
599 		return ret;
600 	}
601 
602 	ret = clk_prepare_enable(qphy->cfg_ahb_clk);
603 	if (ret) {
604 		dev_err(dev, "failed to enable cfg ahb clock, %d\n", ret);
605 		goto disable_iface_clk;
606 	}
607 
608 	if (!qphy->has_se_clk_scheme) {
609 		ret = clk_prepare_enable(qphy->ref_clk);
610 		if (ret) {
611 			dev_err(dev, "failed to enable ref clk, %d\n", ret);
612 			goto disable_ahb_clk;
613 		}
614 	}
615 
616 	writel(0x0, qphy->base + cfg->regs[QUSB2PHY_INTR_CTRL]);
617 
618 	/* bring core PLL out of reset */
619 	if (cfg->has_pll_override) {
620 		qusb2_clrbits(qphy->base,
621 			      cfg->regs[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE],
622 			      CORE_RESET | CORE_RESET_MUX);
623 	}
624 
625 	return 0;
626 
627 disable_ahb_clk:
628 	clk_disable_unprepare(qphy->cfg_ahb_clk);
629 disable_iface_clk:
630 	clk_disable_unprepare(qphy->iface_clk);
631 
632 	return ret;
633 }
634 
635 static int qusb2_phy_init(struct phy *phy)
636 {
637 	struct qusb2_phy *qphy = phy_get_drvdata(phy);
638 	const struct qusb2_phy_cfg *cfg = qphy->cfg;
639 	unsigned int val = 0;
640 	unsigned int clk_scheme;
641 	int ret;
642 
643 	dev_vdbg(&phy->dev, "%s(): Initializing QUSB2 phy\n", __func__);
644 
645 	/* turn on regulator supplies */
646 	ret = regulator_bulk_enable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
647 	if (ret)
648 		return ret;
649 
650 	ret = clk_prepare_enable(qphy->iface_clk);
651 	if (ret) {
652 		dev_err(&phy->dev, "failed to enable iface_clk, %d\n", ret);
653 		goto poweroff_phy;
654 	}
655 
656 	/* enable ahb interface clock to program phy */
657 	ret = clk_prepare_enable(qphy->cfg_ahb_clk);
658 	if (ret) {
659 		dev_err(&phy->dev, "failed to enable cfg ahb clock, %d\n", ret);
660 		goto disable_iface_clk;
661 	}
662 
663 	/* Perform phy reset */
664 	ret = reset_control_assert(qphy->phy_reset);
665 	if (ret) {
666 		dev_err(&phy->dev, "failed to assert phy_reset, %d\n", ret);
667 		goto disable_ahb_clk;
668 	}
669 
670 	/* 100 us delay to keep PHY in reset mode */
671 	usleep_range(100, 150);
672 
673 	ret = reset_control_deassert(qphy->phy_reset);
674 	if (ret) {
675 		dev_err(&phy->dev, "failed to de-assert phy_reset, %d\n", ret);
676 		goto disable_ahb_clk;
677 	}
678 
679 	/* Disable the PHY */
680 	qusb2_setbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN],
681 		      qphy->cfg->disable_ctrl);
682 
683 	if (cfg->has_pll_test) {
684 		/* save reset value to override reference clock scheme later */
685 		val = readl(qphy->base + QUSB2PHY_PLL_TEST);
686 	}
687 
688 	qcom_qusb2_phy_configure(qphy->base, cfg->regs, cfg->tbl,
689 				 cfg->tbl_num);
690 
691 	/* Override board specific PHY tuning values */
692 	qusb2_phy_override_phy_params(qphy);
693 
694 	/* Set efuse value for tuning the PHY */
695 	qusb2_phy_set_tune2_param(qphy);
696 
697 	/* Enable the PHY */
698 	qusb2_clrbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN],
699 		      POWER_DOWN);
700 
701 	/* Required to get phy pll lock successfully */
702 	usleep_range(150, 160);
703 
704 	/* Default is single-ended clock on msm8996 */
705 	qphy->has_se_clk_scheme = true;
706 	/*
707 	 * read TCSR_PHY_CLK_SCHEME register to check if single-ended
708 	 * clock scheme is selected. If yes, then disable differential
709 	 * ref_clk and use single-ended clock, otherwise use differential
710 	 * ref_clk only.
711 	 */
712 	if (qphy->tcsr) {
713 		ret = regmap_read(qphy->tcsr, qphy->cfg->clk_scheme_offset,
714 				  &clk_scheme);
715 		if (ret) {
716 			dev_err(&phy->dev, "failed to read clk scheme reg\n");
717 			goto assert_phy_reset;
718 		}
719 
720 		/* is it a differential clock scheme ? */
721 		if (!(clk_scheme & PHY_CLK_SCHEME_SEL)) {
722 			dev_vdbg(&phy->dev, "%s(): select differential clk\n",
723 				 __func__);
724 			qphy->has_se_clk_scheme = false;
725 		} else {
726 			dev_vdbg(&phy->dev, "%s(): select single-ended clk\n",
727 				 __func__);
728 		}
729 	}
730 
731 	if (!qphy->has_se_clk_scheme) {
732 		ret = clk_prepare_enable(qphy->ref_clk);
733 		if (ret) {
734 			dev_err(&phy->dev, "failed to enable ref clk, %d\n",
735 				ret);
736 			goto assert_phy_reset;
737 		}
738 	}
739 
740 	if (cfg->has_pll_test) {
741 		if (!qphy->has_se_clk_scheme)
742 			val &= ~CLK_REF_SEL;
743 		else
744 			val |= CLK_REF_SEL;
745 
746 		writel(val, qphy->base + QUSB2PHY_PLL_TEST);
747 
748 		/* ensure above write is through */
749 		readl(qphy->base + QUSB2PHY_PLL_TEST);
750 	}
751 
752 	/* Required to get phy pll lock successfully */
753 	usleep_range(100, 110);
754 
755 	val = readb(qphy->base + cfg->regs[QUSB2PHY_PLL_STATUS]);
756 	if (!(val & cfg->mask_core_ready)) {
757 		dev_err(&phy->dev,
758 			"QUSB2PHY pll lock failed: status reg = %x\n", val);
759 		ret = -EBUSY;
760 		goto disable_ref_clk;
761 	}
762 	qphy->phy_initialized = true;
763 
764 	return 0;
765 
766 disable_ref_clk:
767 	if (!qphy->has_se_clk_scheme)
768 		clk_disable_unprepare(qphy->ref_clk);
769 assert_phy_reset:
770 	reset_control_assert(qphy->phy_reset);
771 disable_ahb_clk:
772 	clk_disable_unprepare(qphy->cfg_ahb_clk);
773 disable_iface_clk:
774 	clk_disable_unprepare(qphy->iface_clk);
775 poweroff_phy:
776 	regulator_bulk_disable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
777 
778 	return ret;
779 }
780 
781 static int qusb2_phy_exit(struct phy *phy)
782 {
783 	struct qusb2_phy *qphy = phy_get_drvdata(phy);
784 
785 	/* Disable the PHY */
786 	qusb2_setbits(qphy->base, qphy->cfg->regs[QUSB2PHY_PORT_POWERDOWN],
787 		      qphy->cfg->disable_ctrl);
788 
789 	if (!qphy->has_se_clk_scheme)
790 		clk_disable_unprepare(qphy->ref_clk);
791 
792 	reset_control_assert(qphy->phy_reset);
793 
794 	clk_disable_unprepare(qphy->cfg_ahb_clk);
795 	clk_disable_unprepare(qphy->iface_clk);
796 
797 	regulator_bulk_disable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
798 
799 	qphy->phy_initialized = false;
800 
801 	return 0;
802 }
803 
804 static const struct phy_ops qusb2_phy_gen_ops = {
805 	.init		= qusb2_phy_init,
806 	.exit		= qusb2_phy_exit,
807 	.set_mode	= qusb2_phy_set_mode,
808 	.owner		= THIS_MODULE,
809 };
810 
811 static const struct of_device_id qusb2_phy_of_match_table[] = {
812 	{
813 		.compatible	= "qcom,ipq8074-qusb2-phy",
814 		.data		= &msm8996_phy_cfg,
815 	}, {
816 		.compatible	= "qcom,msm8996-qusb2-phy",
817 		.data		= &msm8996_phy_cfg,
818 	}, {
819 		.compatible	= "qcom,msm8998-qusb2-phy",
820 		.data		= &msm8998_phy_cfg,
821 	}, {
822 		/*
823 		 * Deprecated. Only here to support legacy device
824 		 * trees that didn't include "qcom,qusb2-v2-phy"
825 		 */
826 		.compatible	= "qcom,sdm845-qusb2-phy",
827 		.data		= &qusb2_v2_phy_cfg,
828 	}, {
829 		.compatible	= "qcom,qusb2-v2-phy",
830 		.data		= &qusb2_v2_phy_cfg,
831 	},
832 	{ },
833 };
834 MODULE_DEVICE_TABLE(of, qusb2_phy_of_match_table);
835 
836 static const struct dev_pm_ops qusb2_phy_pm_ops = {
837 	SET_RUNTIME_PM_OPS(qusb2_phy_runtime_suspend,
838 			   qusb2_phy_runtime_resume, NULL)
839 };
840 
841 static int qusb2_phy_probe(struct platform_device *pdev)
842 {
843 	struct device *dev = &pdev->dev;
844 	struct qusb2_phy *qphy;
845 	struct phy_provider *phy_provider;
846 	struct phy *generic_phy;
847 	int ret, i;
848 	int num;
849 	u32 value;
850 	struct override_params *or;
851 
852 	qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
853 	if (!qphy)
854 		return -ENOMEM;
855 	or = &qphy->overrides;
856 
857 	qphy->base = devm_platform_ioremap_resource(pdev, 0);
858 	if (IS_ERR(qphy->base))
859 		return PTR_ERR(qphy->base);
860 
861 	qphy->cfg_ahb_clk = devm_clk_get(dev, "cfg_ahb");
862 	if (IS_ERR(qphy->cfg_ahb_clk)) {
863 		ret = PTR_ERR(qphy->cfg_ahb_clk);
864 		if (ret != -EPROBE_DEFER)
865 			dev_err(dev, "failed to get cfg ahb clk, %d\n", ret);
866 		return ret;
867 	}
868 
869 	qphy->ref_clk = devm_clk_get(dev, "ref");
870 	if (IS_ERR(qphy->ref_clk)) {
871 		ret = PTR_ERR(qphy->ref_clk);
872 		if (ret != -EPROBE_DEFER)
873 			dev_err(dev, "failed to get ref clk, %d\n", ret);
874 		return ret;
875 	}
876 
877 	qphy->iface_clk = devm_clk_get_optional(dev, "iface");
878 	if (IS_ERR(qphy->iface_clk))
879 		return PTR_ERR(qphy->iface_clk);
880 
881 	qphy->phy_reset = devm_reset_control_get_by_index(&pdev->dev, 0);
882 	if (IS_ERR(qphy->phy_reset)) {
883 		dev_err(dev, "failed to get phy core reset\n");
884 		return PTR_ERR(qphy->phy_reset);
885 	}
886 
887 	num = ARRAY_SIZE(qphy->vregs);
888 	for (i = 0; i < num; i++)
889 		qphy->vregs[i].supply = qusb2_phy_vreg_names[i];
890 
891 	ret = devm_regulator_bulk_get(dev, num, qphy->vregs);
892 	if (ret) {
893 		if (ret != -EPROBE_DEFER)
894 			dev_err(dev, "failed to get regulator supplies: %d\n",
895 				ret);
896 		return ret;
897 	}
898 
899 	/* Get the specific init parameters of QMP phy */
900 	qphy->cfg = of_device_get_match_data(dev);
901 
902 	qphy->tcsr = syscon_regmap_lookup_by_phandle(dev->of_node,
903 							"qcom,tcsr-syscon");
904 	if (IS_ERR(qphy->tcsr)) {
905 		dev_dbg(dev, "failed to lookup TCSR regmap\n");
906 		qphy->tcsr = NULL;
907 	}
908 
909 	qphy->cell = devm_nvmem_cell_get(dev, NULL);
910 	if (IS_ERR(qphy->cell)) {
911 		if (PTR_ERR(qphy->cell) == -EPROBE_DEFER)
912 			return -EPROBE_DEFER;
913 		qphy->cell = NULL;
914 		dev_dbg(dev, "failed to lookup tune2 hstx trim value\n");
915 	}
916 
917 	if (!of_property_read_u32(dev->of_node, "qcom,imp-res-offset-value",
918 				  &value)) {
919 		or->imp_res_offset.value = (u8)value;
920 		or->imp_res_offset.override = true;
921 	}
922 
923 	if (!of_property_read_u32(dev->of_node, "qcom,bias-ctrl-value",
924 				  &value)) {
925 		or->bias_ctrl.value = (u8)value;
926 		or->bias_ctrl.override = true;
927 	}
928 
929 	if (!of_property_read_u32(dev->of_node, "qcom,charge-ctrl-value",
930 				  &value)) {
931 		or->charge_ctrl.value = (u8)value;
932 		or->charge_ctrl.override = true;
933 	}
934 
935 	if (!of_property_read_u32(dev->of_node, "qcom,hstx-trim-value",
936 				  &value)) {
937 		or->hstx_trim.value = (u8)value;
938 		or->hstx_trim.override = true;
939 	}
940 
941 	if (!of_property_read_u32(dev->of_node, "qcom,preemphasis-level",
942 				     &value)) {
943 		or->preemphasis.value = (u8)value;
944 		or->preemphasis.override = true;
945 	}
946 
947 	if (!of_property_read_u32(dev->of_node, "qcom,preemphasis-width",
948 				     &value)) {
949 		or->preemphasis_width.value = (u8)value;
950 		or->preemphasis_width.override = true;
951 	}
952 
953 	if (!of_property_read_u32(dev->of_node, "qcom,hsdisc-trim-value",
954 				  &value)) {
955 		or->hsdisc_trim.value = (u8)value;
956 		or->hsdisc_trim.override = true;
957 	}
958 
959 	pm_runtime_set_active(dev);
960 	pm_runtime_enable(dev);
961 	/*
962 	 * Prevent runtime pm from being ON by default. Users can enable
963 	 * it using power/control in sysfs.
964 	 */
965 	pm_runtime_forbid(dev);
966 
967 	generic_phy = devm_phy_create(dev, NULL, &qusb2_phy_gen_ops);
968 	if (IS_ERR(generic_phy)) {
969 		ret = PTR_ERR(generic_phy);
970 		dev_err(dev, "failed to create phy, %d\n", ret);
971 		pm_runtime_disable(dev);
972 		return ret;
973 	}
974 	qphy->phy = generic_phy;
975 
976 	dev_set_drvdata(dev, qphy);
977 	phy_set_drvdata(generic_phy, qphy);
978 
979 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
980 	if (!IS_ERR(phy_provider))
981 		dev_info(dev, "Registered Qcom-QUSB2 phy\n");
982 	else
983 		pm_runtime_disable(dev);
984 
985 	return PTR_ERR_OR_ZERO(phy_provider);
986 }
987 
988 static struct platform_driver qusb2_phy_driver = {
989 	.probe		= qusb2_phy_probe,
990 	.driver = {
991 		.name	= "qcom-qusb2-phy",
992 		.pm	= &qusb2_phy_pm_ops,
993 		.of_match_table = qusb2_phy_of_match_table,
994 	},
995 };
996 
997 module_platform_driver(qusb2_phy_driver);
998 
999 MODULE_AUTHOR("Vivek Gautam <vivek.gautam@codeaurora.org>");
1000 MODULE_DESCRIPTION("Qualcomm QUSB2 PHY driver");
1001 MODULE_LICENSE("GPL v2");
1002