157 строки
3.7 KiB
C
157 строки
3.7 KiB
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))
|
|
return PTR_ERR(pins_default);
|
|
|
|
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");
|