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_CLK_MODE_OFF 0x0 22 #define USB_CLK_MODE_RX_NORMAL_PWR BIT(1) 23 #define USB_LS_KEEPALIVE_OFF 0x4 24 #define USB_LS_KEEPALIVE_ENABLE BIT(4) 25 26 #define USB_PDRSTN_SPLIT BIT(17) 27 #define SYSCON_USB_SPLIT_OFFSET 0x18 28 29 struct jh7110_usb2_phy { 30 struct phy *phy; 31 void __iomem *regs; 32 struct regmap *sys_syscon; 33 struct clk *usb_125m_clk; 34 struct clk *app_125m; 35 enum phy_mode mode; 36 }; 37 38 static void usb2_set_ls_keepalive(struct jh7110_usb2_phy *phy, bool set) 39 { 40 unsigned int val; 41 42 /* Host mode enable the LS speed keep-alive signal */ 43 val = readl(phy->regs + USB_LS_KEEPALIVE_OFF); 44 if (set) 45 val |= USB_LS_KEEPALIVE_ENABLE; 46 else 47 val &= ~USB_LS_KEEPALIVE_ENABLE; 48 49 writel(val, phy->regs + USB_LS_KEEPALIVE_OFF); 50 } 51 52 static int usb2_phy_set_mode(struct phy *_phy, 53 enum phy_mode mode, int submode) 54 { 55 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy); 56 57 switch (mode) { 58 case PHY_MODE_USB_HOST: 59 case PHY_MODE_USB_DEVICE: 60 case PHY_MODE_USB_OTG: 61 break; 62 default: 63 return -EINVAL; 64 } 65 66 if (mode != phy->mode) { 67 dev_dbg(&_phy->dev, "Changing phy to %d\n", mode); 68 phy->mode = mode; 69 usb2_set_ls_keepalive(phy, (mode != PHY_MODE_USB_DEVICE)); 70 } 71 72 /* Connect usb 2.0 phy mode */ 73 regmap_update_bits(phy->sys_syscon, SYSCON_USB_SPLIT_OFFSET, 74 USB_PDRSTN_SPLIT, USB_PDRSTN_SPLIT); 75 76 return 0; 77 } 78 79 static int jh7110_usb2_phy_init(struct phy *_phy) 80 { 81 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy); 82 int ret; 83 unsigned int val; 84 85 ret = clk_set_rate(phy->usb_125m_clk, USB_125M_CLK_RATE); 86 if (ret) 87 return ret; 88 89 ret = clk_prepare_enable(phy->app_125m); 90 if (ret) 91 return ret; 92 93 val = readl(phy->regs + USB_CLK_MODE_OFF); 94 val |= USB_CLK_MODE_RX_NORMAL_PWR; 95 writel(val, phy->regs + USB_CLK_MODE_OFF); 96 97 return 0; 98 } 99 100 static int jh7110_usb2_phy_exit(struct phy *_phy) 101 { 102 struct jh7110_usb2_phy *phy = phy_get_drvdata(_phy); 103 104 clk_disable_unprepare(phy->app_125m); 105 106 return 0; 107 } 108 109 static const struct phy_ops jh7110_usb2_phy_ops = { 110 .init = jh7110_usb2_phy_init, 111 .exit = jh7110_usb2_phy_exit, 112 .set_mode = usb2_phy_set_mode, 113 .owner = THIS_MODULE, 114 }; 115 116 static int jh7110_usb_phy_probe(struct platform_device *pdev) 117 { 118 struct jh7110_usb2_phy *phy; 119 struct device *dev = &pdev->dev; 120 struct phy_provider *phy_provider; 121 122 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); 123 if (!phy) 124 return -ENOMEM; 125 126 phy->usb_125m_clk = devm_clk_get(dev, "125m"); 127 if (IS_ERR(phy->usb_125m_clk)) 128 return dev_err_probe(dev, PTR_ERR(phy->usb_125m_clk), 129 "Failed to get 125m clock\n"); 130 131 phy->app_125m = devm_clk_get(dev, "app_125m"); 132 if (IS_ERR(phy->app_125m)) 133 return dev_err_probe(dev, PTR_ERR(phy->app_125m), 134 "Failed to get app 125m clock\n"); 135 136 phy->regs = devm_platform_ioremap_resource(pdev, 0); 137 if (IS_ERR(phy->regs)) 138 return dev_err_probe(dev, PTR_ERR(phy->regs), 139 "Failed to map phy base\n"); 140 141 phy->phy = devm_phy_create(dev, NULL, &jh7110_usb2_phy_ops); 142 if (IS_ERR(phy->phy)) 143 return dev_err_probe(dev, PTR_ERR(phy->phy), 144 "Failed to create phy\n"); 145 146 phy_set_drvdata(phy->phy, phy); 147 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 148 149 phy->sys_syscon = 150 syscon_regmap_lookup_by_compatible("starfive,jh7110-sys-syscon"); 151 if (IS_ERR(phy->sys_syscon)) 152 return dev_err_probe(dev, PTR_ERR(phy->sys_syscon), 153 "Failed to get sys-syscon\n"); 154 155 return PTR_ERR_OR_ZERO(phy_provider); 156 } 157 158 static const struct of_device_id jh7110_usb_phy_of_match[] = { 159 { .compatible = "starfive,jh7110-usb-phy" }, 160 { /* sentinel */ }, 161 }; 162 MODULE_DEVICE_TABLE(of, jh7110_usb_phy_of_match); 163 164 static struct platform_driver jh7110_usb_phy_driver = { 165 .probe = jh7110_usb_phy_probe, 166 .driver = { 167 .of_match_table = jh7110_usb_phy_of_match, 168 .name = "jh7110-usb-phy", 169 } 170 }; 171 module_platform_driver(jh7110_usb_phy_driver); 172 173 MODULE_DESCRIPTION("StarFive JH7110 USB 2.0 PHY driver"); 174 MODULE_AUTHOR("Minda Chen <minda.chen@starfivetech.com>"); 175 MODULE_LICENSE("GPL"); 176