1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2016 Linaro Ltd 4 */ 5 #include <linux/module.h> 6 #include <linux/ulpi/driver.h> 7 #include <linux/ulpi/regs.h> 8 #include <linux/clk.h> 9 #include <linux/regulator/consumer.h> 10 #include <linux/of.h> 11 #include <linux/phy/phy.h> 12 #include <linux/reset.h> 13 #include <linux/extcon.h> 14 #include <linux/notifier.h> 15 16 #define ULPI_PWR_CLK_MNG_REG 0x88 17 # define ULPI_PWR_OTG_COMP_DISABLE BIT(0) 18 19 #define ULPI_MISC_A 0x96 20 # define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1) 21 # define ULPI_MISC_A_VBUSVLDEXT BIT(0) 22 23 24 struct ulpi_seq { 25 u8 addr; 26 u8 val; 27 }; 28 29 struct qcom_usb_hs_phy { 30 struct ulpi *ulpi; 31 struct phy *phy; 32 struct clk *ref_clk; 33 struct clk *sleep_clk; 34 struct regulator *v1p8; 35 struct regulator *v3p3; 36 struct reset_control *reset; 37 struct ulpi_seq *init_seq; 38 struct extcon_dev *vbus_edev; 39 struct notifier_block vbus_notify; 40 }; 41 qcom_usb_hs_phy_set_mode(struct phy * phy,enum phy_mode mode,int submode)42 static int qcom_usb_hs_phy_set_mode(struct phy *phy, 43 enum phy_mode mode, int submode) 44 { 45 struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy); 46 u8 addr; 47 int ret; 48 49 if (!uphy->vbus_edev) { 50 u8 val = 0; 51 52 switch (mode) { 53 case PHY_MODE_USB_OTG: 54 case PHY_MODE_USB_HOST: 55 val |= ULPI_INT_IDGRD; 56 fallthrough; 57 case PHY_MODE_USB_DEVICE: 58 val |= ULPI_INT_SESS_VALID; 59 break; 60 default: 61 break; 62 } 63 64 ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_RISE, val); 65 if (ret) 66 return ret; 67 ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_FALL, val); 68 } else { 69 switch (mode) { 70 case PHY_MODE_USB_OTG: 71 case PHY_MODE_USB_DEVICE: 72 addr = ULPI_SET(ULPI_MISC_A); 73 break; 74 case PHY_MODE_USB_HOST: 75 addr = ULPI_CLR(ULPI_MISC_A); 76 break; 77 default: 78 return -EINVAL; 79 } 80 81 ret = ulpi_write(uphy->ulpi, ULPI_SET(ULPI_PWR_CLK_MNG_REG), 82 ULPI_PWR_OTG_COMP_DISABLE); 83 if (ret) 84 return ret; 85 ret = ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXTSEL); 86 } 87 88 return ret; 89 } 90 91 static int qcom_usb_hs_phy_vbus_notifier(struct notifier_block * nb,unsigned long event,void * ptr)92 qcom_usb_hs_phy_vbus_notifier(struct notifier_block *nb, unsigned long event, 93 void *ptr) 94 { 95 struct qcom_usb_hs_phy *uphy; 96 u8 addr; 97 98 uphy = container_of(nb, struct qcom_usb_hs_phy, vbus_notify); 99 100 if (event) 101 addr = ULPI_SET(ULPI_MISC_A); 102 else 103 addr = ULPI_CLR(ULPI_MISC_A); 104 105 return ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXT); 106 } 107 qcom_usb_hs_phy_power_on(struct phy * phy)108 static int qcom_usb_hs_phy_power_on(struct phy *phy) 109 { 110 struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy); 111 struct ulpi *ulpi = uphy->ulpi; 112 const struct ulpi_seq *seq; 113 int ret, state; 114 115 ret = clk_prepare_enable(uphy->ref_clk); 116 if (ret) 117 return ret; 118 119 ret = clk_prepare_enable(uphy->sleep_clk); 120 if (ret) 121 goto err_sleep; 122 123 ret = regulator_set_load(uphy->v1p8, 50000); 124 if (ret < 0) 125 goto err_1p8; 126 127 ret = regulator_enable(uphy->v1p8); 128 if (ret) 129 goto err_1p8; 130 131 ret = regulator_set_voltage_triplet(uphy->v3p3, 3050000, 3300000, 132 3300000); 133 if (ret) 134 goto err_3p3; 135 136 ret = regulator_set_load(uphy->v3p3, 50000); 137 if (ret < 0) 138 goto err_3p3; 139 140 ret = regulator_enable(uphy->v3p3); 141 if (ret) 142 goto err_3p3; 143 144 for (seq = uphy->init_seq; seq->addr; seq++) { 145 ret = ulpi_write(ulpi, ULPI_EXT_VENDOR_SPECIFIC + seq->addr, 146 seq->val); 147 if (ret) 148 goto err_ulpi; 149 } 150 151 if (uphy->reset) { 152 ret = reset_control_reset(uphy->reset); 153 if (ret) 154 goto err_ulpi; 155 } 156 157 if (uphy->vbus_edev) { 158 state = extcon_get_state(uphy->vbus_edev, EXTCON_USB); 159 /* setup initial state */ 160 qcom_usb_hs_phy_vbus_notifier(&uphy->vbus_notify, state, 161 uphy->vbus_edev); 162 ret = extcon_register_notifier(uphy->vbus_edev, EXTCON_USB, 163 &uphy->vbus_notify); 164 if (ret) 165 goto err_ulpi; 166 } 167 168 return 0; 169 err_ulpi: 170 regulator_disable(uphy->v3p3); 171 err_3p3: 172 regulator_disable(uphy->v1p8); 173 err_1p8: 174 clk_disable_unprepare(uphy->sleep_clk); 175 err_sleep: 176 clk_disable_unprepare(uphy->ref_clk); 177 return ret; 178 } 179 qcom_usb_hs_phy_power_off(struct phy * phy)180 static int qcom_usb_hs_phy_power_off(struct phy *phy) 181 { 182 struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy); 183 184 if (uphy->vbus_edev) 185 extcon_unregister_notifier(uphy->vbus_edev, EXTCON_USB, 186 &uphy->vbus_notify); 187 regulator_disable(uphy->v3p3); 188 regulator_disable(uphy->v1p8); 189 clk_disable_unprepare(uphy->sleep_clk); 190 clk_disable_unprepare(uphy->ref_clk); 191 192 return 0; 193 } 194 195 static const struct phy_ops qcom_usb_hs_phy_ops = { 196 .power_on = qcom_usb_hs_phy_power_on, 197 .power_off = qcom_usb_hs_phy_power_off, 198 .set_mode = qcom_usb_hs_phy_set_mode, 199 .owner = THIS_MODULE, 200 }; 201 qcom_usb_hs_phy_probe(struct ulpi * ulpi)202 static int qcom_usb_hs_phy_probe(struct ulpi *ulpi) 203 { 204 struct qcom_usb_hs_phy *uphy; 205 struct phy_provider *p; 206 struct clk *clk; 207 struct regulator *reg; 208 struct reset_control *reset; 209 int size; 210 int ret; 211 212 uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL); 213 if (!uphy) 214 return -ENOMEM; 215 ulpi_set_drvdata(ulpi, uphy); 216 uphy->ulpi = ulpi; 217 218 size = of_property_count_u8_elems(ulpi->dev.of_node, "qcom,init-seq"); 219 if (size < 0) 220 size = 0; 221 uphy->init_seq = devm_kmalloc_array(&ulpi->dev, (size / 2) + 1, 222 sizeof(*uphy->init_seq), GFP_KERNEL); 223 if (!uphy->init_seq) 224 return -ENOMEM; 225 ret = of_property_read_u8_array(ulpi->dev.of_node, "qcom,init-seq", 226 (u8 *)uphy->init_seq, size); 227 if (ret && size) 228 return ret; 229 /* NUL terminate */ 230 uphy->init_seq[size / 2].addr = uphy->init_seq[size / 2].val = 0; 231 232 uphy->ref_clk = clk = devm_clk_get(&ulpi->dev, "ref"); 233 if (IS_ERR(clk)) 234 return PTR_ERR(clk); 235 236 uphy->sleep_clk = clk = devm_clk_get(&ulpi->dev, "sleep"); 237 if (IS_ERR(clk)) 238 return PTR_ERR(clk); 239 240 uphy->v1p8 = reg = devm_regulator_get(&ulpi->dev, "v1p8"); 241 if (IS_ERR(reg)) 242 return PTR_ERR(reg); 243 244 uphy->v3p3 = reg = devm_regulator_get(&ulpi->dev, "v3p3"); 245 if (IS_ERR(reg)) 246 return PTR_ERR(reg); 247 248 uphy->reset = reset = devm_reset_control_get(&ulpi->dev, "por"); 249 if (IS_ERR(reset)) { 250 if (PTR_ERR(reset) == -EPROBE_DEFER) 251 return PTR_ERR(reset); 252 uphy->reset = NULL; 253 } 254 255 uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node, 256 &qcom_usb_hs_phy_ops); 257 if (IS_ERR(uphy->phy)) 258 return PTR_ERR(uphy->phy); 259 260 uphy->vbus_edev = extcon_get_edev_by_phandle(&ulpi->dev, 0); 261 if (IS_ERR(uphy->vbus_edev)) { 262 if (PTR_ERR(uphy->vbus_edev) != -ENODEV) 263 return PTR_ERR(uphy->vbus_edev); 264 uphy->vbus_edev = NULL; 265 } 266 267 uphy->vbus_notify.notifier_call = qcom_usb_hs_phy_vbus_notifier; 268 phy_set_drvdata(uphy->phy, uphy); 269 270 p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate); 271 return PTR_ERR_OR_ZERO(p); 272 } 273 274 static const struct of_device_id qcom_usb_hs_phy_match[] = { 275 { .compatible = "qcom,usb-hs-phy", }, 276 { } 277 }; 278 MODULE_DEVICE_TABLE(of, qcom_usb_hs_phy_match); 279 280 static struct ulpi_driver qcom_usb_hs_phy_driver = { 281 .probe = qcom_usb_hs_phy_probe, 282 .driver = { 283 .name = "qcom_usb_hs_phy", 284 .of_match_table = qcom_usb_hs_phy_match, 285 }, 286 }; 287 module_ulpi_driver(qcom_usb_hs_phy_driver); 288 289 MODULE_DESCRIPTION("Qualcomm USB HS phy"); 290 MODULE_LICENSE("GPL v2"); 291