phy-fsl-imx8mq-usb.c
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/*
* Copyright (c) 2017 NXP.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/io.h>
#define PHY_CTRL0 0x0
#define PHY_CTRL0_REF_SSP_EN BIT(2)
#define PHY_CTRL0_SSC_RANGE_MASK (7 << 21)
#define PHY_CTRL0_SSC_RANGE_4003PPM (0x2 << 21)
#define PHY_CTRL1 0x4
#define PHY_CTRL1_RESET BIT(0)
#define PHY_CTRL1_COMMONONN BIT(1)
#define PHY_CTRL1_ATERESET BIT(3)
#define PHY_CTRL1_VDATSRCENB0 BIT(19)
#define PHY_CTRL1_VDATDETENB0 BIT(20)
#define PHY_CTRL2 0x8
#define PHY_CTRL2_TXENABLEN0 BIT(8)
struct imx8mq_usb_phy {
struct phy *phy;
struct clk *clk;
void __iomem *base;
};
static int imx8mq_phy_start(struct phy *_phy)
{
struct imx8mq_usb_phy *phy = phy_get_drvdata(_phy);
return clk_prepare_enable(phy->clk);
}
static int imx8mq_phy_exit(struct phy *_phy)
{
struct imx8mq_usb_phy *phy = phy_get_drvdata(_phy);
clk_disable_unprepare(phy->clk);
return 0;
}
static struct phy_ops imx8mq_usb_phy_ops = {
.init = imx8mq_phy_start,
.exit = imx8mq_phy_exit,
.owner = THIS_MODULE,
};
static void imx8mq_usb_phy_init(struct imx8mq_usb_phy *phy)
{
u32 value;
value = readl(phy->base + PHY_CTRL1);
value &= ~(PHY_CTRL1_VDATSRCENB0 | PHY_CTRL1_VDATDETENB0 |
PHY_CTRL1_COMMONONN);
value |= PHY_CTRL1_RESET | PHY_CTRL1_ATERESET;
writel(value, phy->base + PHY_CTRL1);
value = readl(phy->base + PHY_CTRL0);
value |= PHY_CTRL0_REF_SSP_EN;
value &= ~PHY_CTRL0_SSC_RANGE_MASK;
value |= PHY_CTRL0_SSC_RANGE_4003PPM;
writel(value, phy->base + PHY_CTRL0);
value = readl(phy->base + PHY_CTRL2);
value |= PHY_CTRL2_TXENABLEN0;
writel(value, phy->base + PHY_CTRL2);
value = readl(phy->base + PHY_CTRL1);
value &= ~(PHY_CTRL1_RESET | PHY_CTRL1_ATERESET);
writel(value, phy->base + PHY_CTRL1);
}
static int imx8mq_usb_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct device *dev = &pdev->dev;
struct imx8mq_usb_phy *imx_phy;
struct resource *res;
imx_phy = devm_kzalloc(dev, sizeof(*imx_phy), GFP_KERNEL);
if (!imx_phy)
return -ENOMEM;
imx_phy->clk = devm_clk_get(dev, "usb_phy_root_clk");
if (IS_ERR(imx_phy->clk)) {
dev_err(dev, "failed to get imx8mq usb phy clock\n");
return PTR_ERR(imx_phy->clk);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
imx_phy->base = devm_ioremap_resource(dev, res);
if (IS_ERR(imx_phy->base))
return PTR_ERR(imx_phy->base);
imx_phy->phy = devm_phy_create(dev, NULL, &imx8mq_usb_phy_ops);
if (IS_ERR(imx_phy->phy))
return PTR_ERR(imx_phy->phy);
phy_set_drvdata(imx_phy->phy, imx_phy);
imx8mq_usb_phy_init(imx_phy);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id imx8mq_usb_phy_of_match[] = {
{.compatible = "fsl,imx8mq-usb-phy",},
{ },
};
MODULE_DEVICE_TABLE(of, imx8mq_usb_phy_of_match);
static struct platform_driver imx8mq_usb_phy_driver = {
.probe = imx8mq_usb_phy_probe,
.driver = {
.name = "imx8mq-usb-phy",
.of_match_table = imx8mq_usb_phy_of_match,
}
};
module_platform_driver(imx8mq_usb_phy_driver);
MODULE_DESCRIPTION("FSL IMX8MQ USB PHY driver");
MODULE_ALIAS("platform:imx8mq-usb-phy");
MODULE_LICENSE("GPL");