1 /* 2 * phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver 3 * 4 * Copyright (C) 2016 David Lechner <david@lechnology.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 */ 15 16 #include <linux/clk.h> 17 #include <linux/io.h> 18 #include <linux/of.h> 19 #include <linux/mfd/da8xx-cfgchip.h> 20 #include <linux/mfd/syscon.h> 21 #include <linux/module.h> 22 #include <linux/phy/phy.h> 23 #include <linux/platform_device.h> 24 #include <linux/regmap.h> 25 26 #define PHY_INIT_BITS (CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN) 27 28 struct da8xx_usb_phy { 29 struct phy_provider *phy_provider; 30 struct phy *usb11_phy; 31 struct phy *usb20_phy; 32 struct clk *usb11_clk; 33 struct clk *usb20_clk; 34 struct regmap *regmap; 35 }; 36 37 static int da8xx_usb11_phy_power_on(struct phy *phy) 38 { 39 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 40 int ret; 41 42 ret = clk_prepare_enable(d_phy->usb11_clk); 43 if (ret) 44 return ret; 45 46 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 47 CFGCHIP2_USB1SUSPENDM); 48 49 return 0; 50 } 51 52 static int da8xx_usb11_phy_power_off(struct phy *phy) 53 { 54 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 55 56 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0); 57 58 clk_disable_unprepare(d_phy->usb11_clk); 59 60 return 0; 61 } 62 63 static const struct phy_ops da8xx_usb11_phy_ops = { 64 .power_on = da8xx_usb11_phy_power_on, 65 .power_off = da8xx_usb11_phy_power_off, 66 .owner = THIS_MODULE, 67 }; 68 69 static int da8xx_usb20_phy_power_on(struct phy *phy) 70 { 71 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 72 int ret; 73 74 ret = clk_prepare_enable(d_phy->usb20_clk); 75 if (ret) 76 return ret; 77 78 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0); 79 80 return 0; 81 } 82 83 static int da8xx_usb20_phy_power_off(struct phy *phy) 84 { 85 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 86 87 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 88 CFGCHIP2_OTGPWRDN); 89 90 clk_disable_unprepare(d_phy->usb20_clk); 91 92 return 0; 93 } 94 95 static int da8xx_usb20_phy_set_mode(struct phy *phy, enum phy_mode mode) 96 { 97 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 98 u32 val; 99 100 switch (mode) { 101 case PHY_MODE_USB_HOST: /* Force VBUS valid, ID = 0 */ 102 val = CFGCHIP2_OTGMODE_FORCE_HOST; 103 break; 104 case PHY_MODE_USB_DEVICE: /* Force VBUS valid, ID = 1 */ 105 val = CFGCHIP2_OTGMODE_FORCE_DEVICE; 106 break; 107 case PHY_MODE_USB_OTG: /* Don't override the VBUS/ID comparators */ 108 val = CFGCHIP2_OTGMODE_NO_OVERRIDE; 109 break; 110 default: 111 return -EINVAL; 112 } 113 114 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK, 115 val); 116 117 return 0; 118 } 119 120 static const struct phy_ops da8xx_usb20_phy_ops = { 121 .power_on = da8xx_usb20_phy_power_on, 122 .power_off = da8xx_usb20_phy_power_off, 123 .set_mode = da8xx_usb20_phy_set_mode, 124 .owner = THIS_MODULE, 125 }; 126 127 static struct phy *da8xx_usb_phy_of_xlate(struct device *dev, 128 struct of_phandle_args *args) 129 { 130 struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); 131 132 if (!d_phy) 133 return ERR_PTR(-ENODEV); 134 135 switch (args->args[0]) { 136 case 0: 137 return d_phy->usb20_phy; 138 case 1: 139 return d_phy->usb11_phy; 140 default: 141 return ERR_PTR(-EINVAL); 142 } 143 } 144 145 static int da8xx_usb_phy_probe(struct platform_device *pdev) 146 { 147 struct device *dev = &pdev->dev; 148 struct device_node *node = dev->of_node; 149 struct da8xx_usb_phy *d_phy; 150 151 d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL); 152 if (!d_phy) 153 return -ENOMEM; 154 155 if (node) 156 d_phy->regmap = syscon_regmap_lookup_by_compatible( 157 "ti,da830-cfgchip"); 158 else 159 d_phy->regmap = syscon_regmap_lookup_by_pdevname("syscon"); 160 if (IS_ERR(d_phy->regmap)) { 161 dev_err(dev, "Failed to get syscon\n"); 162 return PTR_ERR(d_phy->regmap); 163 } 164 165 d_phy->usb11_clk = devm_clk_get(dev, "usb11_phy"); 166 if (IS_ERR(d_phy->usb11_clk)) { 167 dev_err(dev, "Failed to get usb11_phy clock\n"); 168 return PTR_ERR(d_phy->usb11_clk); 169 } 170 171 d_phy->usb20_clk = devm_clk_get(dev, "usb20_phy"); 172 if (IS_ERR(d_phy->usb20_clk)) { 173 dev_err(dev, "Failed to get usb20_phy clock\n"); 174 return PTR_ERR(d_phy->usb20_clk); 175 } 176 177 d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops); 178 if (IS_ERR(d_phy->usb11_phy)) { 179 dev_err(dev, "Failed to create usb11 phy\n"); 180 return PTR_ERR(d_phy->usb11_phy); 181 } 182 183 d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops); 184 if (IS_ERR(d_phy->usb20_phy)) { 185 dev_err(dev, "Failed to create usb20 phy\n"); 186 return PTR_ERR(d_phy->usb20_phy); 187 } 188 189 platform_set_drvdata(pdev, d_phy); 190 phy_set_drvdata(d_phy->usb11_phy, d_phy); 191 phy_set_drvdata(d_phy->usb20_phy, d_phy); 192 193 if (node) { 194 d_phy->phy_provider = devm_of_phy_provider_register(dev, 195 da8xx_usb_phy_of_xlate); 196 if (IS_ERR(d_phy->phy_provider)) { 197 dev_err(dev, "Failed to create phy provider\n"); 198 return PTR_ERR(d_phy->phy_provider); 199 } 200 } else { 201 int ret; 202 203 ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy", 204 "ohci-da8xx"); 205 if (ret) 206 dev_warn(dev, "Failed to create usb11 phy lookup\n"); 207 ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy", 208 "musb-da8xx"); 209 if (ret) 210 dev_warn(dev, "Failed to create usb20 phy lookup\n"); 211 } 212 213 regmap_write_bits(d_phy->regmap, CFGCHIP(2), 214 PHY_INIT_BITS, PHY_INIT_BITS); 215 216 return 0; 217 } 218 219 static int da8xx_usb_phy_remove(struct platform_device *pdev) 220 { 221 struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev); 222 223 if (!pdev->dev.of_node) { 224 phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx"); 225 phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci-da8xx"); 226 } 227 228 return 0; 229 } 230 231 static const struct of_device_id da8xx_usb_phy_ids[] = { 232 { .compatible = "ti,da830-usb-phy" }, 233 { } 234 }; 235 MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids); 236 237 static struct platform_driver da8xx_usb_phy_driver = { 238 .probe = da8xx_usb_phy_probe, 239 .remove = da8xx_usb_phy_remove, 240 .driver = { 241 .name = "da8xx-usb-phy", 242 .of_match_table = da8xx_usb_phy_ids, 243 }, 244 }; 245 246 module_platform_driver(da8xx_usb_phy_driver); 247 248 MODULE_ALIAS("platform:da8xx-usb-phy"); 249 MODULE_AUTHOR("David Lechner <david@lechnology.com>"); 250 MODULE_DESCRIPTION("TI DA8xx USB PHY driver"); 251 MODULE_LICENSE("GPL v2"); 252