drivers/phy/qualcomm/phy-qcom-usb-hs.c

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