1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Allwinner sun9i USB phy driver 4 * 5 * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org> 6 * 7 * Based on phy-sun4i-usb.c from 8 * Hans de Goede <hdegoede@redhat.com> 9 * 10 * and code from 11 * Allwinner Technology Co., Ltd. <www.allwinnertech.com> 12 */ 13 14 #include <linux/clk.h> 15 #include <linux/err.h> 16 #include <linux/io.h> 17 #include <linux/module.h> 18 #include <linux/phy/phy.h> 19 #include <linux/usb/of.h> 20 #include <linux/platform_device.h> 21 #include <linux/reset.h> 22 23 #define SUNXI_AHB_INCR16_BURST_EN BIT(11) 24 #define SUNXI_AHB_INCR8_BURST_EN BIT(10) 25 #define SUNXI_AHB_INCR4_BURST_EN BIT(9) 26 #define SUNXI_AHB_INCRX_ALIGN_EN BIT(8) 27 #define SUNXI_ULPI_BYPASS_EN BIT(0) 28 29 /* usb1 HSIC specific bits */ 30 #define SUNXI_EHCI_HS_FORCE BIT(20) 31 #define SUNXI_HSIC_CONNECT_DET BIT(17) 32 #define SUNXI_HSIC_CONNECT_INT BIT(16) 33 #define SUNXI_HSIC BIT(1) 34 35 struct sun9i_usb_phy { 36 struct phy *phy; 37 void __iomem *pmu; 38 struct reset_control *reset; 39 struct clk *clk; 40 struct clk *hsic_clk; 41 enum usb_phy_interface type; 42 }; 43 44 static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable) 45 { 46 u32 bits, reg_value; 47 48 bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN | 49 SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN | 50 SUNXI_ULPI_BYPASS_EN; 51 52 if (phy->type == USBPHY_INTERFACE_MODE_HSIC) 53 bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE | 54 SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT; 55 56 reg_value = readl(phy->pmu); 57 58 if (enable) 59 reg_value |= bits; 60 else 61 reg_value &= ~bits; 62 63 writel(reg_value, phy->pmu); 64 } 65 66 static int sun9i_usb_phy_init(struct phy *_phy) 67 { 68 struct sun9i_usb_phy *phy = phy_get_drvdata(_phy); 69 int ret; 70 71 ret = clk_prepare_enable(phy->clk); 72 if (ret) 73 goto err_clk; 74 75 ret = clk_prepare_enable(phy->hsic_clk); 76 if (ret) 77 goto err_hsic_clk; 78 79 ret = reset_control_deassert(phy->reset); 80 if (ret) 81 goto err_reset; 82 83 sun9i_usb_phy_passby(phy, 1); 84 return 0; 85 86 err_reset: 87 clk_disable_unprepare(phy->hsic_clk); 88 89 err_hsic_clk: 90 clk_disable_unprepare(phy->clk); 91 92 err_clk: 93 return ret; 94 } 95 96 static int sun9i_usb_phy_exit(struct phy *_phy) 97 { 98 struct sun9i_usb_phy *phy = phy_get_drvdata(_phy); 99 100 sun9i_usb_phy_passby(phy, 0); 101 reset_control_assert(phy->reset); 102 clk_disable_unprepare(phy->hsic_clk); 103 clk_disable_unprepare(phy->clk); 104 105 return 0; 106 } 107 108 static const struct phy_ops sun9i_usb_phy_ops = { 109 .init = sun9i_usb_phy_init, 110 .exit = sun9i_usb_phy_exit, 111 .owner = THIS_MODULE, 112 }; 113 114 static int sun9i_usb_phy_probe(struct platform_device *pdev) 115 { 116 struct sun9i_usb_phy *phy; 117 struct device *dev = &pdev->dev; 118 struct device_node *np = dev->of_node; 119 struct phy_provider *phy_provider; 120 struct resource *res; 121 122 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); 123 if (!phy) 124 return -ENOMEM; 125 126 phy->type = of_usb_get_phy_mode(np); 127 if (phy->type == USBPHY_INTERFACE_MODE_HSIC) { 128 phy->clk = devm_clk_get(dev, "hsic_480M"); 129 if (IS_ERR(phy->clk)) { 130 dev_err(dev, "failed to get hsic_480M clock\n"); 131 return PTR_ERR(phy->clk); 132 } 133 134 phy->hsic_clk = devm_clk_get(dev, "hsic_12M"); 135 if (IS_ERR(phy->hsic_clk)) { 136 dev_err(dev, "failed to get hsic_12M clock\n"); 137 return PTR_ERR(phy->hsic_clk); 138 } 139 140 phy->reset = devm_reset_control_get(dev, "hsic"); 141 if (IS_ERR(phy->reset)) { 142 dev_err(dev, "failed to get reset control\n"); 143 return PTR_ERR(phy->reset); 144 } 145 } else { 146 phy->clk = devm_clk_get(dev, "phy"); 147 if (IS_ERR(phy->clk)) { 148 dev_err(dev, "failed to get phy clock\n"); 149 return PTR_ERR(phy->clk); 150 } 151 152 phy->reset = devm_reset_control_get(dev, "phy"); 153 if (IS_ERR(phy->reset)) { 154 dev_err(dev, "failed to get reset control\n"); 155 return PTR_ERR(phy->reset); 156 } 157 } 158 159 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 160 phy->pmu = devm_ioremap_resource(dev, res); 161 if (IS_ERR(phy->pmu)) 162 return PTR_ERR(phy->pmu); 163 164 phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops); 165 if (IS_ERR(phy->phy)) { 166 dev_err(dev, "failed to create PHY\n"); 167 return PTR_ERR(phy->phy); 168 } 169 170 phy_set_drvdata(phy->phy, phy); 171 phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); 172 173 return PTR_ERR_OR_ZERO(phy_provider); 174 } 175 176 static const struct of_device_id sun9i_usb_phy_of_match[] = { 177 { .compatible = "allwinner,sun9i-a80-usb-phy" }, 178 { }, 179 }; 180 MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match); 181 182 static struct platform_driver sun9i_usb_phy_driver = { 183 .probe = sun9i_usb_phy_probe, 184 .driver = { 185 .of_match_table = sun9i_usb_phy_of_match, 186 .name = "sun9i-usb-phy", 187 } 188 }; 189 module_platform_driver(sun9i_usb_phy_driver); 190 191 MODULE_DESCRIPTION("Allwinner sun9i USB phy driver"); 192 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); 193 MODULE_LICENSE("GPL"); 194