1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * StarFive JH7110 USB 2.0 PHY driver 4 * 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 125000000 21 #define USB_LS_KEEPALIVE_OFF 0x4 22 #define USB_LS_KEEPALIVE_ENABLE BIT(4) 23 24 #define USB_PDRSTN_SPLIT BIT(17) 25 #define SYSCON_USB_SPLIT_OFFSET 0x18 26 27 struct 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 36 static 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 else 45 val &= ~USB_LS_KEEPALIVE_ENABLE; 46 47 writel(val, phy->regs + USB_LS_KEEPALIVE_OFF); 48 } 49 50 static 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 77 static 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 93 static 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 } 101 102 static 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 }; 108 109 static 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 } 150 151 static const struct of_device_id jh7110_usb_phy_of_match[] = { 152 { .compatible = "starfive,jh7110-usb-phy" }, 153 { /* sentinel */ }, 154 }; 155 MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match); 156 157 static 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 }; 164 module_platform_driver(jh7110_usb_phy_driver); 165 166 MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver"); 167 MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>"); 168 MODULE_LICENSE("GPL"); 169