1
linux/drivers/phy/qualcomm/phy-qcom-usb-hsic.c
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

157 lines
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");