Quelle  phy-qcom-usb-hsic.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2016 Linaro Ltd
 */
#include <linux/module.h>
#include <linux/ulpi/driver.h>
#include <linux/ulpi/regs.h>
#include <linux/phy/phy.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl-state.h>
#include <linux/delay.h>
#include <linux/clk.h>

#define ULPI_HSIC_CFG  0x30
#define ULPI_HSIC_IO_CAL 0x33

struct qcom_usb_hsic_phy {
 struct ulpi *ulpi;
 struct phy *phy;
 struct pinctrl *pctl;
 struct clk *phy_clk;
 struct clk *cal_clk;
 struct clk *cal_sleep_clk;
};

static int qcom_usb_hsic_phy_power_on(struct phy *phy)
{
 struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
 struct ulpi *ulpi = uphy->ulpi;
 struct pinctrl_state *pins_default;
 int ret;

 ret = clk_prepare_enable(uphy->phy_clk);
 if (ret)
  return ret;

 ret = clk_prepare_enable(uphy->cal_clk);
 if (ret)
  goto err_cal;

 ret = clk_prepare_enable(uphy->cal_sleep_clk);
 if (ret)
  goto err_sleep;

 /* Set periodic calibration interval to ~2.048sec in HSIC_IO_CAL_REG */
 ret = ulpi_write(ulpi, ULPI_HSIC_IO_CAL, 0xff);
 if (ret)
  goto err_ulpi;

 /* Enable periodic IO calibration in HSIC_CFG register */
 ret = ulpi_write(ulpi, ULPI_HSIC_CFG, 0xa8);
 if (ret)
  goto err_ulpi;

 /* Configure pins for HSIC functionality */
 pins_default = pinctrl_lookup_state(uphy->pctl, PINCTRL_STATE_DEFAULT);
 if (IS_ERR(pins_default)) {
  ret = PTR_ERR(pins_default);
  goto err_ulpi;
 }

 ret = pinctrl_select_state(uphy->pctl, pins_default);
 if (ret)
  goto err_ulpi;

  /* Enable HSIC mode in HSIC_CFG register */
 ret = ulpi_write(ulpi, ULPI_SET(ULPI_HSIC_CFG), 0x01);
 if (ret)
  goto err_ulpi;

 /* Disable auto-resume */
 ret = ulpi_write(ulpi, ULPI_CLR(ULPI_IFC_CTRL),
    ULPI_IFC_CTRL_AUTORESUME);
 if (ret)
  goto err_ulpi;

 return ret;
err_ulpi:
 clk_disable_unprepare(uphy->cal_sleep_clk);
err_sleep:
 clk_disable_unprepare(uphy->cal_clk);
err_cal:
 clk_disable_unprepare(uphy->phy_clk);
 return ret;
}

static int qcom_usb_hsic_phy_power_off(struct phy *phy)
{
 struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);

 clk_disable_unprepare(uphy->cal_sleep_clk);
 clk_disable_unprepare(uphy->cal_clk);
 clk_disable_unprepare(uphy->phy_clk);

 return 0;
}

static const struct phy_ops qcom_usb_hsic_phy_ops = {
 .power_on = qcom_usb_hsic_phy_power_on,
 .power_off = qcom_usb_hsic_phy_power_off,
 .owner = THIS_MODULE,
};

static int qcom_usb_hsic_phy_probe(struct ulpi *ulpi)
{
 struct qcom_usb_hsic_phy *uphy;
 struct phy_provider *p;
 struct clk *clk;

 uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
 if (!uphy)
  return -ENOMEM;
 ulpi_set_drvdata(ulpi, uphy);

 uphy->ulpi = ulpi;
 uphy->pctl = devm_pinctrl_get(&ulpi->dev);
 if (IS_ERR(uphy->pctl))
  return PTR_ERR(uphy->pctl);

 uphy->phy_clk = clk = devm_clk_get(&ulpi->dev, "phy");
 if (IS_ERR(clk))
  return PTR_ERR(clk);

 uphy->cal_clk = clk = devm_clk_get(&ulpi->dev, "cal");
 if (IS_ERR(clk))
  return PTR_ERR(clk);

 uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep");
 if (IS_ERR(clk))
  return PTR_ERR(clk);

 uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
        &qcom_usb_hsic_phy_ops);
 if (IS_ERR(uphy->phy))
  return PTR_ERR(uphy->phy);
 phy_set_drvdata(uphy->phy, uphy);

 p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
 return PTR_ERR_OR_ZERO(p);
}

static const struct of_device_id qcom_usb_hsic_phy_match[] = {
 { .compatible = "qcom,usb-hsic-phy", },
 { }
};
MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match);

static struct ulpi_driver qcom_usb_hsic_phy_driver = {
 .probe = qcom_usb_hsic_phy_probe,
 .driver = {
  .name = "qcom_usb_hsic_phy",
  .of_match_table = qcom_usb_hsic_phy_match,
 },
};
module_ulpi_driver(qcom_usb_hsic_phy_driver);

MODULE_DESCRIPTION("Qualcomm USB HSIC phy");
MODULE_LICENSE("GPL v2");