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1// SPDX-License-Identifier: GPL-2.0+2/*3 * StarFive JH7110 USB 2.0 PHY driver4 *5 * Copyright (C) 2023 StarFive Technology Co., Ltd.6 * Author: Minda Chen <minda.chen@starfivetech.com>7 */8 9#include <linux/bits.h>10#include <linux/clk.h>11#include <linux/err.h>12#include <linux/io.h>13#include <linux/mfd/syscon.h>14#include <linux/module.h>15#include <linux/phy/phy.h>16#include <linux/platform_device.h>17#include <linux/regmap.h>18#include <linux/usb/of.h>19 20#define USB_125M_CLK_RATE		12500000021#define USB_LS_KEEPALIVE_OFF		0x422#define USB_LS_KEEPALIVE_ENABLE		BIT(4)23 24#define USB_PDRSTN_SPLIT		BIT(17)25#define SYSCON_USB_SPLIT_OFFSET		0x1826 27struct jh7110_usb2_phy {28	struct phy *phy;29	void __iomem *regs;30	struct regmap *sys_syscon;31	struct clk *usb_125m_clk;32	struct clk *app_125m;33	enum phy_mode mode;34};35 36static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set)37{38	unsigned int val;39 40	/* Host mode enable the LS speed keep-alive signal */41	val = readl(phy->regs + USB_LS_KEEPALIVE_OFF);42	if (set)43		val |= USB_LS_KEEPALIVE_ENABLE;44	else45		val &= ~USB_LS_KEEPALIVE_ENABLE;46 47	writel(val, phy->regs + USB_LS_KEEPALIVE_OFF);48}49 50static int usb2_phy_set_mode(struct phy *_phy,51			     enum phy_mode mode, int submode)52{53	struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);54 55	switch (mode) {56	case PHY_MODE_USB_HOST:57	case PHY_MODE_USB_DEVICE:58	case PHY_MODE_USB_OTG:59		break;60	default:61		return -EINVAL;62	}63 64	if (mode != phy->mode) {65		dev_dbg(&_phy->dev, "Changing phy to %d\n", mode);66		phy->mode = mode;67		usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE));68	}69 70	/* Connect usb 2.0 phy mode */71	regmap_update_bits(phy->sys_syscon, SYSCON_USB_SPLIT_OFFSET,72			   USB_PDRSTN_SPLIT, USB_PDRSTN_SPLIT);73 74	return 0;75}76 77static int jh7110_usb2_phy_init(struct phy *_phy)78{79	struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);80	int ret;81 82	ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE);83	if (ret)84		return ret;85 86	ret = clk_prepare_enable(phy->app_125m);87	if (ret)88		return ret;89 90	return 0;91}92 93static int jh7110_usb2_phy_exit(struct phy *_phy)94{95	struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy);96 97	clk_disable_unprepare(phy->app_125m);98 99	return 0;100}101 102static const struct phy_ops jh7110_usb2_phy_ops = {103	.init		= jh7110_usb2_phy_init,104	.exit		= jh7110_usb2_phy_exit,105	.set_mode	= usb2_phy_set_mode,106	.owner		= THIS_MODULE,107};108 109static int jh7110_usb_phy_probe(struct platform_device *pdev)110{111	struct jh7110_usb2_phy *phy;112	struct device *dev = &pdev->dev;113	struct phy_provider *phy_provider;114 115	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);116	if (!phy)117		return -ENOMEM;118 119	phy->usb_125m_clk = devm_clk_get(dev, "125m");120	if (IS_ERR(phy->usb_125m_clk))121		return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk),122			"Failed to get 125m clock\n");123 124	phy->app_125m = devm_clk_get(dev, "app_125m");125	if (IS_ERR(phy->app_125m))126		return dev_err_probe(dev, PTR_ERR(phy->app_125m),127			"Failed to get app 125m clock\n");128 129	phy->regs = devm_platform_ioremap_resource(pdev, 0);130	if (IS_ERR(phy->regs))131		return dev_err_probe(dev, PTR_ERR(phy->regs),132			"Failed to map phy base\n");133 134	phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops);135	if (IS_ERR(phy->phy))136		return dev_err_probe(dev, PTR_ERR(phy->phy),137			"Failed to create phy\n");138 139	phy_set_drvdata(phy->phy, phy);140	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);141 142	phy->sys_syscon =143		syscon_regmap_lookup_by_compatible("starfive,jh7110-sys-syscon");144	if (IS_ERR(phy->sys_syscon))145		return dev_err_probe(dev, PTR_ERR(phy->sys_syscon),146				     "Failed to get sys-syscon\n");147 148	return PTR_ERR_OR_ZERO(phy_provider);149}150 151static const struct of_device_id jh7110_usb_phy_of_match[] = {152	{ .compatible = "starfive,jh7110-usb-phy" },153	{ /* sentinel */ },154};155MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match);156 157static struct platform_driver jh7110_usb_phy_driver = {158	.probe	= jh7110_usb_phy_probe,159	.driver = {160		.of_match_table	= jh7110_usb_phy_of_match,161		.name  = "jh7110-usb-phy",162	}163};164module_platform_driver(jh7110_usb_phy_driver);165 166MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver");167MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>");168MODULE_LICENSE("GPL");169