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// SPDX-License-Identifier: GPL-2.0+
/*
* StarFive JH7110 USB 2.0 PHY driver
*
* Copyright (C) 2023 StarFive Technology Co., Ltd.
* Author: Minda Chen <minda.chen@starfivetech.com>
*/
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/usb/of.h>
#define USB_125M_CLK_RATE 125000000
#define USB_LS_KEEPALIVE_OFF 0x4
#define USB_LS_KEEPALIVE_ENABLE BIT(4)
struct jh7110_usb2_phy {
struct phy *phy;
void __iomem *regs;
struct clk *usb_125m_clk;
struct clk *app_125m;
enum phy_mode mode;
};
static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set)
{
unsigned int val;
/* Host mode enable the LS speed keep-alive signal */
val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);
if (set)
val |= USB_LS_KEEPALIVE_ENABLE;
else
val &= ~USB_LS_KEEPALIVE_ENABLE;
writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);
}
static int usb2_phy_set_mode(struct phy *_phy,
enum phy_mode mode, int submode)
{
struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
switch (mode) {
case PHY_MODE_USB_HOST:
case PHY_MODE_USB_DEVICE:
case PHY_MODE_USB_OTG:
break;
default:
return -EINVAL;
}
if (mode != phy->mode) {
dev_dbg(&_phy->dev, "Changing phy to %d\n", mode);
phy->mode = mode;
usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE));
}
return 0;
}
static int jh7110_usb2_phy_init(struct phy *_phy)
{
struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
int ret;
ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);
if (ret)
return ret;
ret = clk_prepare_enable(phy->app_125m);
if (ret)
return ret;
return 0;
}
static int jh7110_usb2_phy_exit(struct phy *_phy)
{
struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);
clk_disable_unprepare(phy->app_125m);
return 0;
}
static const struct phy_ops jh7110_usb2_phy_ops = {
.init = jh7110_usb2_phy_init,
.exit = jh7110_usb2_phy_exit,
.set_mode = usb2_phy_set_mode,
.owner = THIS_MODULE,
};
static int jh7110_usb_phy_probe(struct platform_device *pdev)
{
struct jh7110_usb2_phy *phy;
struct device *dev = &pdev->dev;
struct phy_provider *phy_provider;
phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
if (!phy)
return -ENOMEM;
phy->usb_125m_clk = devm_clk_get(dev, "125m");
if (IS_ERR(phy->usb_125m_clk))
return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),
"Failed to get 125m clock\n");
phy->app_125m = devm_clk_get(dev, "app_125m");
if (IS_ERR(phy->app_125m))
return dev_err_probe(dev, PTR_ERR(phy->app_125m),
"Failed to get app 125m clock\n");
phy->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(phy->regs))
return dev_err_probe(dev, PTR_ERR(phy->regs),
"Failed to map phy base\n");
phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);
if (IS_ERR(phy->phy))
return dev_err_probe(dev, PTR_ERR(phy->phy),
"Failed to create phy\n");
phy_set_drvdata(phy->phy, 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 jh7110_usb_phy_of_match[] = {
{ .compatible = "starfive,jh7110-usb-phy" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);
static struct platform_driver jh7110_usb_phy_driver = {
.probe = jh7110_usb_phy_probe,
.driver = {
.of_match_table = jh7110_usb_phy_of_match,
.name = "jh7110-usb-phy",
}
};
module_platform_driver(jh7110_usb_phy_driver);
MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");
MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>");
MODULE_LICENSE("GPL");
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