1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2023, Linaro Limited
6 #include <linux/module.h>
7 #include <linux/platform_device.h>
8 #include <linux/regulator/consumer.h>
9 #include <linux/regmap.h>
11 #include <linux/phy/phy.h>
13 /* eUSB2 status registers */
14 #define EUSB2_RPTR_STATUS 0x08
15 #define RPTR_OK BIT(7)
17 /* eUSB2 control registers */
18 #define EUSB2_EN_CTL1 0x46
19 #define EUSB2_RPTR_EN BIT(7)
21 #define EUSB2_FORCE_EN_5 0xe8
22 #define F_CLK_19P2M_EN BIT(6)
24 #define EUSB2_FORCE_VAL_5 0xeD
25 #define V_CLK_19P2M_EN BIT(6)
27 #define EUSB2_TUNE_USB2_CROSSOVER 0x50
28 #define EUSB2_TUNE_IUSB2 0x51
29 #define EUSB2_TUNE_RES_FSDIF 0x52
30 #define EUSB2_TUNE_HSDISC 0x53
31 #define EUSB2_TUNE_SQUELCH_U 0x54
32 #define EUSB2_TUNE_USB2_SLEW 0x55
33 #define EUSB2_TUNE_USB2_EQU 0x56
34 #define EUSB2_TUNE_USB2_PREEM 0x57
35 #define EUSB2_TUNE_USB2_HS_COMP_CUR 0x58
36 #define EUSB2_TUNE_EUSB_SLEW 0x59
37 #define EUSB2_TUNE_EUSB_EQU 0x5A
38 #define EUSB2_TUNE_EUSB_HS_COMP_CUR 0x5B
40 enum eusb2_reg_layout {
41 TUNE_EUSB_HS_COMP_CUR,
44 TUNE_USB2_HS_COMP_CUR,
55 FORCE_VAL_5 = NUM_TUNE_FIELDS,
64 struct eusb2_repeater_cfg {
67 const char * const *vreg_list;
71 struct eusb2_repeater {
73 struct regmap *regmap;
75 struct regulator_bulk_data *vregs;
76 const struct eusb2_repeater_cfg *cfg;
81 static const char * const pm8550b_vreg_l[] = {
85 static const u32 pm8550b_init_tbl[NUM_TUNE_FIELDS] = {
87 [TUNE_SQUELCH_U] = 0x3,
88 [TUNE_USB2_PREEM] = 0x5,
91 static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = {
92 .init_tbl = pm8550b_init_tbl,
93 .init_tbl_num = ARRAY_SIZE(pm8550b_init_tbl),
94 .vreg_list = pm8550b_vreg_l,
95 .num_vregs = ARRAY_SIZE(pm8550b_vreg_l),
98 static int eusb2_repeater_init_vregs(struct eusb2_repeater *rptr)
100 int num = rptr->cfg->num_vregs;
101 struct device *dev = rptr->dev;
104 rptr->vregs = devm_kcalloc(dev, num, sizeof(*rptr->vregs), GFP_KERNEL);
108 for (i = 0; i < num; i++)
109 rptr->vregs[i].supply = rptr->cfg->vreg_list[i];
111 return devm_regulator_bulk_get(dev, num, rptr->vregs);
114 static int eusb2_repeater_init(struct phy *phy)
116 struct eusb2_repeater *rptr = phy_get_drvdata(phy);
117 struct device_node *np = rptr->dev->of_node;
118 struct regmap *regmap = rptr->regmap;
119 const u32 *init_tbl = rptr->cfg->init_tbl;
120 u8 tune_usb2_preem = init_tbl[TUNE_USB2_PREEM];
121 u8 tune_hsdisc = init_tbl[TUNE_HSDISC];
122 u8 tune_iusb2 = init_tbl[TUNE_IUSB2];
123 u32 base = rptr->base;
127 of_property_read_u8(np, "qcom,tune-usb2-amplitude", &tune_iusb2);
128 of_property_read_u8(np, "qcom,tune-usb2-disc-thres", &tune_hsdisc);
129 of_property_read_u8(np, "qcom,tune-usb2-preem", &tune_usb2_preem);
131 ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
135 regmap_write(regmap, base + EUSB2_EN_CTL1, EUSB2_RPTR_EN);
137 regmap_write(regmap, base + EUSB2_TUNE_EUSB_HS_COMP_CUR, init_tbl[TUNE_EUSB_HS_COMP_CUR]);
138 regmap_write(regmap, base + EUSB2_TUNE_EUSB_EQU, init_tbl[TUNE_EUSB_EQU]);
139 regmap_write(regmap, base + EUSB2_TUNE_EUSB_SLEW, init_tbl[TUNE_EUSB_SLEW]);
140 regmap_write(regmap, base + EUSB2_TUNE_USB2_HS_COMP_CUR, init_tbl[TUNE_USB2_HS_COMP_CUR]);
141 regmap_write(regmap, base + EUSB2_TUNE_USB2_EQU, init_tbl[TUNE_USB2_EQU]);
142 regmap_write(regmap, base + EUSB2_TUNE_USB2_SLEW, init_tbl[TUNE_USB2_SLEW]);
143 regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, init_tbl[TUNE_SQUELCH_U]);
144 regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, init_tbl[TUNE_RES_FSDIF]);
145 regmap_write(regmap, base + EUSB2_TUNE_USB2_CROSSOVER, init_tbl[TUNE_USB2_CROSSOVER]);
147 regmap_write(regmap, base + EUSB2_TUNE_USB2_PREEM, tune_usb2_preem);
148 regmap_write(regmap, base + EUSB2_TUNE_HSDISC, tune_hsdisc);
149 regmap_write(regmap, base + EUSB2_TUNE_IUSB2, tune_iusb2);
151 ret = regmap_read_poll_timeout(regmap, base + EUSB2_RPTR_STATUS, val, val & RPTR_OK, 10, 5);
153 dev_err(rptr->dev, "initialization timed-out\n");
158 static int eusb2_repeater_set_mode(struct phy *phy,
159 enum phy_mode mode, int submode)
161 struct eusb2_repeater *rptr = phy_get_drvdata(phy);
162 struct regmap *regmap = rptr->regmap;
163 u32 base = rptr->base;
166 case PHY_MODE_USB_HOST:
168 * CM.Lx is prohibited when repeater is already into Lx state as
169 * per eUSB 1.2 Spec. Below implement software workaround until
170 * PHY and controller is fixing seen observation.
172 regmap_write(regmap, base + EUSB2_FORCE_EN_5, F_CLK_19P2M_EN);
173 regmap_write(regmap, base + EUSB2_FORCE_VAL_5, V_CLK_19P2M_EN);
175 case PHY_MODE_USB_DEVICE:
177 * In device mode clear host mode related workaround as there
178 * is no repeater reset available, and enable/disable of
179 * repeater doesn't clear previous value due to shared
180 * regulators (say host <-> device mode switch).
182 regmap_write(regmap, base + EUSB2_FORCE_EN_5, 0);
183 regmap_write(regmap, base + EUSB2_FORCE_VAL_5, 0);
192 static int eusb2_repeater_exit(struct phy *phy)
194 struct eusb2_repeater *rptr = phy_get_drvdata(phy);
196 return regulator_bulk_disable(rptr->cfg->num_vregs, rptr->vregs);
199 static const struct phy_ops eusb2_repeater_ops = {
200 .init = eusb2_repeater_init,
201 .exit = eusb2_repeater_exit,
202 .set_mode = eusb2_repeater_set_mode,
203 .owner = THIS_MODULE,
206 static int eusb2_repeater_probe(struct platform_device *pdev)
208 struct eusb2_repeater *rptr;
209 struct device *dev = &pdev->dev;
210 struct phy_provider *phy_provider;
211 struct device_node *np = dev->of_node;
215 rptr = devm_kzalloc(dev, sizeof(*rptr), GFP_KERNEL);
220 dev_set_drvdata(dev, rptr);
222 rptr->cfg = of_device_get_match_data(dev);
226 rptr->regmap = dev_get_regmap(dev->parent, NULL);
230 ret = of_property_read_u32(np, "reg", &res);
236 ret = eusb2_repeater_init_vregs(rptr);
238 dev_err(dev, "unable to get supplies\n");
242 rptr->phy = devm_phy_create(dev, np, &eusb2_repeater_ops);
243 if (IS_ERR(rptr->phy)) {
244 dev_err(dev, "failed to create PHY: %d\n", ret);
245 return PTR_ERR(rptr->phy);
248 phy_set_drvdata(rptr->phy, rptr);
250 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
251 if (IS_ERR(phy_provider))
252 return PTR_ERR(phy_provider);
254 dev_info(dev, "Registered Qcom-eUSB2 repeater\n");
259 static void eusb2_repeater_remove(struct platform_device *pdev)
261 struct eusb2_repeater *rptr = platform_get_drvdata(pdev);
266 eusb2_repeater_exit(rptr->phy);
269 static const struct of_device_id eusb2_repeater_of_match_table[] = {
271 .compatible = "qcom,pm8550b-eusb2-repeater",
272 .data = &pm8550b_eusb2_cfg,
276 MODULE_DEVICE_TABLE(of, eusb2_repeater_of_match_table);
278 static struct platform_driver eusb2_repeater_driver = {
279 .probe = eusb2_repeater_probe,
280 .remove_new = eusb2_repeater_remove,
282 .name = "qcom-eusb2-repeater",
283 .of_match_table = eusb2_repeater_of_match_table,
287 module_platform_driver(eusb2_repeater_driver);
289 MODULE_DESCRIPTION("Qualcomm PMIC eUSB2 Repeater driver");
290 MODULE_LICENSE("GPL");