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, enum phy_mode mode)
  46 {
  47         struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
  48         u8 addr;
  49         int ret;
  50
  51         if (!uphy->vbus_edev) {
  52                 u8 val = 0;
  53
  54                 switch (mode) {
  55                 case PHY_MODE_USB_OTG:
  56                 case PHY_MODE_USB_HOST:
  57                         val |= ULPI_INT_IDGRD;
  58                 case PHY_MODE_USB_DEVICE:
  59                         val |= ULPI_INT_SESS_VALID;
  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
  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
 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 = devm_extcon_register_notifier(&ulpi->dev, uphy->vbus_edev,
 163                                 EXTCON_USB, &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
 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         regulator_disable(uphy->v3p3);
 185         regulator_disable(uphy->v1p8);
 186         clk_disable_unprepare(uphy->sleep_clk);
 187         clk_disable_unprepare(uphy->ref_clk);
 188
 189         return 0;
 190 }
 191
 192 static const struct phy_ops qcom_usb_hs_phy_ops = {
 193         .power_on = qcom_usb_hs_phy_power_on,
 194         .power_off = qcom_usb_hs_phy_power_off,
 195         .set_mode = qcom_usb_hs_phy_set_mode,
 196         .owner = THIS_MODULE,
 197 };
 198
 199 static int qcom_usb_hs_phy_probe(struct ulpi *ulpi)
 200 {
 201         struct qcom_usb_hs_phy *uphy;
 202         struct phy_provider *p;
 203         struct clk *clk;
 204         struct regulator *reg;
 205         struct reset_control *reset;
 206         int size;
 207         int ret;
 208
 209         uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
 210         if (!uphy)
 211                 return -ENOMEM;
 212         ulpi_set_drvdata(ulpi, uphy);
 213         uphy->ulpi = ulpi;
 214
 215         size = of_property_count_u8_elems(ulpi->dev.of_node, "qcom,init-seq");
 216         if (size < 0)
 217                 size = 0;
 218         uphy->init_seq = devm_kmalloc_array(&ulpi->dev, (size / 2) + 1,
 219                                            sizeof(*uphy->init_seq), GFP_KERNEL);
 220         if (!uphy->init_seq)
 221                 return -ENOMEM;
 222         ret = of_property_read_u8_array(ulpi->dev.of_node, "qcom,init-seq",
 223                                         (u8 *)uphy->init_seq, size);
 224         if (ret && size)
 225                 return ret;
 226         /* NUL terminate */
 227         uphy->init_seq[size / 2].addr = uphy->init_seq[size / 2].val = 0;
 228
 229         uphy->ref_clk = clk = devm_clk_get(&ulpi->dev, "ref");
 230         if (IS_ERR(clk))
 231                 return PTR_ERR(clk);
 232
 233         uphy->sleep_clk = clk = devm_clk_get(&ulpi->dev, "sleep");
 234         if (IS_ERR(clk))
 235                 return PTR_ERR(clk);
 236
 237         uphy->v1p8 = reg = devm_regulator_get(&ulpi->dev, "v1p8");
 238         if (IS_ERR(reg))
 239                 return PTR_ERR(reg);
 240
 241         uphy->v3p3 = reg = devm_regulator_get(&ulpi->dev, "v3p3");
 242         if (IS_ERR(reg))
 243                 return PTR_ERR(reg);
 244
 245         uphy->reset = reset = devm_reset_control_get(&ulpi->dev, "por");
 246         if (IS_ERR(reset)) {
 247                 if (PTR_ERR(reset) == -EPROBE_DEFER)
 248                         return PTR_ERR(reset);
 249                 uphy->reset = NULL;
 250         }
 251
 252         uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
 253                                     &qcom_usb_hs_phy_ops);
 254         if (IS_ERR(uphy->phy))
 255                 return PTR_ERR(uphy->phy);
 256
 257         uphy->vbus_edev = extcon_get_edev_by_phandle(&ulpi->dev, 0);
 258         if (IS_ERR(uphy->vbus_edev)) {
 259                 if (PTR_ERR(uphy->vbus_edev) != -ENODEV)
 260                         return PTR_ERR(uphy->vbus_edev);
 261                 uphy->vbus_edev = NULL;
 262         }
 263
 264         uphy->vbus_notify.notifier_call = qcom_usb_hs_phy_vbus_notifier;
 265         phy_set_drvdata(uphy->phy, uphy);
 266
 267         p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
 268         return PTR_ERR_OR_ZERO(p);
 269 }
 270
 271 static const struct of_device_id qcom_usb_hs_phy_match[] = {
 272         { .compatible = "qcom,usb-hs-phy", },
 273         { }
 274 };
 275 MODULE_DEVICE_TABLE(of, qcom_usb_hs_phy_match);
 276
 277 static struct ulpi_driver qcom_usb_hs_phy_driver = {
 278         .probe = qcom_usb_hs_phy_probe,
 279         .driver = {
 280                 .name = "qcom_usb_hs_phy",
 281                 .of_match_table = qcom_usb_hs_phy_match,
 282         },
 283 };
 284 module_ulpi_driver(qcom_usb_hs_phy_driver);
 285
 286 MODULE_DESCRIPTION("Qualcomm USB HS phy");
 287 MODULE_LICENSE("GPL v2");