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