LXR linux/drivers/phy/qualcomm/phy-qcom-usb-hsic.c

   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/phy/phy.h>
   9#include <linux/pinctrl/consumer.h>
  10#include <linux/pinctrl/pinctrl-state.h>
  11#include <linux/delay.h>
  12#include <linux/clk.h>
  13
  14#define ULPI_HSIC_CFG           0x30
  15#define ULPI_HSIC_IO_CAL        0x33
  16
  17struct qcom_usb_hsic_phy {
  18        struct ulpi *ulpi;
  19        struct phy *phy;
  20        struct pinctrl *pctl;
  21        struct clk *phy_clk;
  22        struct clk *cal_clk;
  23        struct clk *cal_sleep_clk;
  24};
  25
  26static int qcom_usb_hsic_phy_power_on(struct phy *phy)
  27{
  28        struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
  29        struct ulpi *ulpi = uphy->ulpi;
  30        struct pinctrl_state *pins_default;
  31        int ret;
  32
  33        ret = clk_prepare_enable(uphy->phy_clk);
  34        if (ret)
  35                return ret;
  36
  37        ret = clk_prepare_enable(uphy->cal_clk);
  38        if (ret)
  39                goto err_cal;
  40
  41        ret = clk_prepare_enable(uphy->cal_sleep_clk);
  42        if (ret)
  43                goto err_sleep;
  44
  45        /* Set periodic calibration interval to ~2.048sec in HSIC_IO_CAL_REG */
  46        ret = ulpi_write(ulpi, ULPI_HSIC_IO_CAL, 0xff);
  47        if (ret)
  48                goto err_ulpi;
  49
  50        /* Enable periodic IO calibration in HSIC_CFG register */
  51        ret = ulpi_write(ulpi, ULPI_HSIC_CFG, 0xa8);
  52        if (ret)
  53                goto err_ulpi;
  54
  55        /* Configure pins for HSIC functionality */
  56        pins_default = pinctrl_lookup_state(uphy->pctl, PINCTRL_STATE_DEFAULT);
  57        if (IS_ERR(pins_default))
  58                return PTR_ERR(pins_default);
  59
  60        ret = pinctrl_select_state(uphy->pctl, pins_default);
  61        if (ret)
  62                goto err_ulpi;
  63
  64         /* Enable HSIC mode in HSIC_CFG register */
  65        ret = ulpi_write(ulpi, ULPI_SET(ULPI_HSIC_CFG), 0x01);
  66        if (ret)
  67                goto err_ulpi;
  68
  69        /* Disable auto-resume */
  70        ret = ulpi_write(ulpi, ULPI_CLR(ULPI_IFC_CTRL),
  71                         ULPI_IFC_CTRL_AUTORESUME);
  72        if (ret)
  73                goto err_ulpi;
  74
  75        return ret;
  76err_ulpi:
  77        clk_disable_unprepare(uphy->cal_sleep_clk);
  78err_sleep:
  79        clk_disable_unprepare(uphy->cal_clk);
  80err_cal:
  81        clk_disable_unprepare(uphy->phy_clk);
  82        return ret;
  83}
  84
  85static int qcom_usb_hsic_phy_power_off(struct phy *phy)
  86{
  87        struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
  88
  89        clk_disable_unprepare(uphy->cal_sleep_clk);
  90        clk_disable_unprepare(uphy->cal_clk);
  91        clk_disable_unprepare(uphy->phy_clk);
  92
  93        return 0;
  94}
  95
  96static const struct phy_ops qcom_usb_hsic_phy_ops = {
  97        .power_on = qcom_usb_hsic_phy_power_on,
  98        .power_off = qcom_usb_hsic_phy_power_off,
  99        .owner = THIS_MODULE,
 100};
 101
 102static int qcom_usb_hsic_phy_probe(struct ulpi *ulpi)
 103{
 104        struct qcom_usb_hsic_phy *uphy;
 105        struct phy_provider *p;
 106        struct clk *clk;
 107
 108        uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
 109        if (!uphy)
 110                return -ENOMEM;
 111        ulpi_set_drvdata(ulpi, uphy);
 112
 113        uphy->ulpi = ulpi;
 114        uphy->pctl = devm_pinctrl_get(&ulpi->dev);
 115        if (IS_ERR(uphy->pctl))
 116                return PTR_ERR(uphy->pctl);
 117
 118        uphy->phy_clk = clk = devm_clk_get(&ulpi->dev, "phy");
 119        if (IS_ERR(clk))
 120                return PTR_ERR(clk);
 121
 122        uphy->cal_clk = clk = devm_clk_get(&ulpi->dev, "cal");
 123        if (IS_ERR(clk))
 124                return PTR_ERR(clk);
 125
 126        uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep");
 127        if (IS_ERR(clk))
 128                return PTR_ERR(clk);
 129
 130        uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
 131                                    &qcom_usb_hsic_phy_ops);
 132        if (IS_ERR(uphy->phy))
 133                return PTR_ERR(uphy->phy);
 134        phy_set_drvdata(uphy->phy, uphy);
 135
 136        p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
 137        return PTR_ERR_OR_ZERO(p);
 138}
 139
 140static const struct of_device_id qcom_usb_hsic_phy_match[] = {
 141        { .compatible = "qcom,usb-hsic-phy", },
 142        { }
 143};
 144MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match);
 145
 146static struct ulpi_driver qcom_usb_hsic_phy_driver = {
 147        .probe = qcom_usb_hsic_phy_probe,
 148        .driver = {
 149                .name = "qcom_usb_hsic_phy",
 150                .of_match_table = qcom_usb_hsic_phy_match,
 151        },
 152};
 153module_ulpi_driver(qcom_usb_hsic_phy_driver);
 154
 155MODULE_DESCRIPTION("Qualcomm USB HSIC phy");
 156MODULE_LICENSE("GPL v2");
 157