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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