1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2023, Linaro Limited 4 */ 5 6 #include <linux/module.h> 7 #include <linux/platform_device.h> 8 #include <linux/regulator/consumer.h> 9 #include <linux/regmap.h> 10 #include <linux/of.h> 11 #include <linux/phy/phy.h> 12 13 /* eUSB2 status registers */ 14 #define EUSB2_RPTR_STATUS 0x08 15 #define RPTR_OK BIT(7) 16 17 /* eUSB2 control registers */ 18 #define EUSB2_EN_CTL1 0x46 19 #define EUSB2_RPTR_EN BIT(7) 20 21 #define EUSB2_FORCE_EN_5 0xe8 22 #define F_CLK_19P2M_EN BIT(6) 23 24 #define EUSB2_FORCE_VAL_5 0xeD 25 #define V_CLK_19P2M_EN BIT(6) 26 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 39 40 enum eusb2_reg_layout { 41 TUNE_EUSB_HS_COMP_CUR, 42 TUNE_EUSB_EQU, 43 TUNE_EUSB_SLEW, 44 TUNE_USB2_HS_COMP_CUR, 45 TUNE_USB2_PREEM, 46 TUNE_USB2_EQU, 47 TUNE_USB2_SLEW, 48 TUNE_SQUELCH_U, 49 TUNE_HSDISC, 50 TUNE_RES_FSDIF, 51 TUNE_IUSB2, 52 TUNE_USB2_CROSSOVER, 53 NUM_TUNE_FIELDS, 54 55 FORCE_VAL_5 = NUM_TUNE_FIELDS, 56 FORCE_EN_5, 57 58 EN_CTL1, 59 60 RPTR_STATUS, 61 LAYOUT_SIZE, 62 }; 63 64 struct eusb2_repeater_cfg { 65 const u32 *init_tbl; 66 int init_tbl_num; 67 const char * const *vreg_list; 68 int num_vregs; 69 }; 70 71 struct eusb2_repeater { 72 struct device *dev; 73 struct regmap *regmap; 74 struct phy *phy; 75 struct regulator_bulk_data *vregs; 76 const struct eusb2_repeater_cfg *cfg; 77 u32 base; 78 enum phy_mode mode; 79 }; 80 81 static const char * const pm8550b_vreg_l[] = { 82 "vdd18", "vdd3", 83 }; 84 85 static const u32 pm8550b_init_tbl[NUM_TUNE_FIELDS] = { 86 [TUNE_IUSB2] = 0x8, 87 [TUNE_SQUELCH_U] = 0x3, 88 [TUNE_USB2_PREEM] = 0x5, 89 }; 90 91 static const u32 smb2360_init_tbl[NUM_TUNE_FIELDS] = { 92 [TUNE_IUSB2] = 0x5, 93 [TUNE_SQUELCH_U] = 0x3, 94 [TUNE_USB2_PREEM] = 0x2, 95 }; 96 97 static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = { 98 .init_tbl = pm8550b_init_tbl, 99 .init_tbl_num = ARRAY_SIZE(pm8550b_init_tbl), 100 .vreg_list = pm8550b_vreg_l, 101 .num_vregs = ARRAY_SIZE(pm8550b_vreg_l), 102 }; 103 104 static const struct eusb2_repeater_cfg smb2360_eusb2_cfg = { 105 .init_tbl = smb2360_init_tbl, 106 .init_tbl_num = ARRAY_SIZE(smb2360_init_tbl), 107 .vreg_list = pm8550b_vreg_l, 108 .num_vregs = ARRAY_SIZE(pm8550b_vreg_l), 109 }; 110 111 static int eusb2_repeater_init_vregs(struct eusb2_repeater *rptr) 112 { 113 int num = rptr->cfg->num_vregs; 114 struct device *dev = rptr->dev; 115 int i; 116 117 rptr->vregs = devm_kcalloc(dev, num, sizeof(*rptr->vregs), GFP_KERNEL); 118 if (!rptr->vregs) 119 return -ENOMEM; 120 121 for (i = 0; i < num; i++) 122 rptr->vregs[i].supply = rptr->cfg->vreg_list[i]; 123 124 return devm_regulator_bulk_get(dev, num, rptr->vregs); 125 } 126 127 static int eusb2_repeater_init(struct phy *phy) 128 { 129 struct eusb2_repeater *rptr = phy_get_drvdata(phy); 130 struct device_node *np = rptr->dev->of_node; 131 struct regmap *regmap = rptr->regmap; 132 const u32 *init_tbl = rptr->cfg->init_tbl; 133 u8 tune_usb2_preem = init_tbl[TUNE_USB2_PREEM]; 134 u8 tune_hsdisc = init_tbl[TUNE_HSDISC]; 135 u8 tune_iusb2 = init_tbl[TUNE_IUSB2]; 136 u32 base = rptr->base; 137 u32 val; 138 int ret; 139 140 of_property_read_u8(np, "qcom,tune-usb2-amplitude", &tune_iusb2); 141 of_property_read_u8(np, "qcom,tune-usb2-disc-thres", &tune_hsdisc); 142 of_property_read_u8(np, "qcom,tune-usb2-preem", &tune_usb2_preem); 143 144 ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs); 145 if (ret) 146 return ret; 147 148 regmap_write(regmap, base + EUSB2_EN_CTL1, EUSB2_RPTR_EN); 149 150 regmap_write(regmap, base + EUSB2_TUNE_EUSB_HS_COMP_CUR, init_tbl[TUNE_EUSB_HS_COMP_CUR]); 151 regmap_write(regmap, base + EUSB2_TUNE_EUSB_EQU, init_tbl[TUNE_EUSB_EQU]); 152 regmap_write(regmap, base + EUSB2_TUNE_EUSB_SLEW, init_tbl[TUNE_EUSB_SLEW]); 153 regmap_write(regmap, base + EUSB2_TUNE_USB2_HS_COMP_CUR, init_tbl[TUNE_USB2_HS_COMP_CUR]); 154 regmap_write(regmap, base + EUSB2_TUNE_USB2_EQU, init_tbl[TUNE_USB2_EQU]); 155 regmap_write(regmap, base + EUSB2_TUNE_USB2_SLEW, init_tbl[TUNE_USB2_SLEW]); 156 regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, init_tbl[TUNE_SQUELCH_U]); 157 regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, init_tbl[TUNE_RES_FSDIF]); 158 regmap_write(regmap, base + EUSB2_TUNE_USB2_CROSSOVER, init_tbl[TUNE_USB2_CROSSOVER]); 159 160 regmap_write(regmap, base + EUSB2_TUNE_USB2_PREEM, tune_usb2_preem); 161 regmap_write(regmap, base + EUSB2_TUNE_HSDISC, tune_hsdisc); 162 regmap_write(regmap, base + EUSB2_TUNE_IUSB2, tune_iusb2); 163 164 ret = regmap_read_poll_timeout(regmap, base + EUSB2_RPTR_STATUS, val, val & RPTR_OK, 10, 5); 165 if (ret) 166 dev_err(rptr->dev, "initialization timed-out\n"); 167 168 return ret; 169 } 170 171 static int eusb2_repeater_set_mode(struct phy *phy, 172 enum phy_mode mode, int submode) 173 { 174 struct eusb2_repeater *rptr = phy_get_drvdata(phy); 175 struct regmap *regmap = rptr->regmap; 176 u32 base = rptr->base; 177 178 switch (mode) { 179 case PHY_MODE_USB_HOST: 180 /* 181 * CM.Lx is prohibited when repeater is already into Lx state as 182 * per eUSB 1.2 Spec. Below implement software workaround until 183 * PHY and controller is fixing seen observation. 184 */ 185 regmap_write(regmap, base + EUSB2_FORCE_EN_5, F_CLK_19P2M_EN); 186 regmap_write(regmap, base + EUSB2_FORCE_VAL_5, V_CLK_19P2M_EN); 187 break; 188 case PHY_MODE_USB_DEVICE: 189 /* 190 * In device mode clear host mode related workaround as there 191 * is no repeater reset available, and enable/disable of 192 * repeater doesn't clear previous value due to shared 193 * regulators (say host <-> device mode switch). 194 */ 195 regmap_write(regmap, base + EUSB2_FORCE_EN_5, 0); 196 regmap_write(regmap, base + EUSB2_FORCE_VAL_5, 0); 197 break; 198 default: 199 return -EINVAL; 200 } 201 202 return 0; 203 } 204 205 static int eusb2_repeater_exit(struct phy *phy) 206 { 207 struct eusb2_repeater *rptr = phy_get_drvdata(phy); 208 209 return regulator_bulk_disable(rptr->cfg->num_vregs, rptr->vregs); 210 } 211 212 static const struct phy_ops eusb2_repeater_ops = { 213 .init = eusb2_repeater_init, 214 .exit = eusb2_repeater_exit, 215 .set_mode = eusb2_repeater_set_mode, 216 .owner = THIS_MODULE, 217 }; 218 219 static int eusb2_repeater_probe(struct platform_device *pdev) 220 { 221 struct eusb2_repeater *rptr; 222 struct device *dev = &pdev->dev; 223 struct phy_provider *phy_provider; 224 struct device_node *np = dev->of_node; 225 u32 res; 226 int ret; 227 228 rptr = devm_kzalloc(dev, sizeof(*rptr), GFP_KERNEL); 229 if (!rptr) 230 return -ENOMEM; 231 232 rptr->dev = dev; 233 dev_set_drvdata(dev, rptr); 234 235 rptr->cfg = of_device_get_match_data(dev); 236 if (!rptr->cfg) 237 return -EINVAL; 238 239 rptr->regmap = dev_get_regmap(dev->parent, NULL); 240 if (!rptr->regmap) 241 return -ENODEV; 242 243 ret = of_property_read_u32(np, "reg", &res); 244 if (ret < 0) 245 return ret; 246 247 rptr->base = res; 248 249 ret = eusb2_repeater_init_vregs(rptr); 250 if (ret < 0) { 251 dev_err(dev, "unable to get supplies\n"); 252 return ret; 253 } 254 255 rptr->phy = devm_phy_create(dev, np, &eusb2_repeater_ops); 256 if (IS_ERR(rptr->phy)) { 257 dev_err(dev, "failed to create PHY: %d\n", ret); 258 return PTR_ERR(rptr->phy); 259 } 260 261 phy_set_drvdata(rptr->phy, rptr); 262 263 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 264 if (IS_ERR(phy_provider)) 265 return PTR_ERR(phy_provider); 266 267 dev_info(dev, "Registered Qcom-eUSB2 repeater\n"); 268 269 return 0; 270 } 271 272 static void eusb2_repeater_remove(struct platform_device *pdev) 273 { 274 struct eusb2_repeater *rptr = platform_get_drvdata(pdev); 275 276 if (!rptr) 277 return; 278 279 eusb2_repeater_exit(rptr->phy); 280 } 281 282 static const struct of_device_id eusb2_repeater_of_match_table[] = { 283 { 284 .compatible = "qcom,pm8550b-eusb2-repeater", 285 .data = &pm8550b_eusb2_cfg, 286 }, 287 { 288 .compatible = "qcom,smb2360-eusb2-repeater", 289 .data = &smb2360_eusb2_cfg, 290 }, 291 { }, 292 }; 293 MODULE_DEVICE_TABLE(of, eusb2_repeater_of_match_table); 294 295 static struct platform_driver eusb2_repeater_driver = { 296 .probe = eusb2_repeater_probe, 297 .remove_new = eusb2_repeater_remove, 298 .driver = { 299 .name = "qcom-eusb2-repeater", 300 .of_match_table = eusb2_repeater_of_match_table, 301 }, 302 }; 303 304 module_platform_driver(eusb2_repeater_driver); 305 306 MODULE_DESCRIPTION("Qualcomm PMIC eUSB2 Repeater driver"); 307 MODULE_LICENSE("GPL"); 308