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_data/phy-da8xx-usb.h> 24 #include <linux/platform_device.h> 25 #include <linux/regmap.h> 26 27 #define PHY_INIT_BITS (CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN) 28 29 struct da8xx_usb_phy { 30 struct phy_provider *phy_provider; 31 struct phy *usb11_phy; 32 struct phy *usb20_phy; 33 struct clk *usb11_clk; 34 struct clk *usb20_clk; 35 struct regmap *regmap; 36 }; 37 38 static int da8xx_usb11_phy_power_on(struct phy *phy) 39 { 40 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 41 int ret; 42 43 ret = clk_prepare_enable(d_phy->usb11_clk); 44 if (ret) 45 return ret; 46 47 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 48 CFGCHIP2_USB1SUSPENDM); 49 50 return 0; 51 } 52 53 static int da8xx_usb11_phy_power_off(struct phy *phy) 54 { 55 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 56 57 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0); 58 59 clk_disable_unprepare(d_phy->usb11_clk); 60 61 return 0; 62 } 63 64 static const struct phy_ops da8xx_usb11_phy_ops = { 65 .power_on = da8xx_usb11_phy_power_on, 66 .power_off = da8xx_usb11_phy_power_off, 67 .owner = THIS_MODULE, 68 }; 69 70 static int da8xx_usb20_phy_power_on(struct phy *phy) 71 { 72 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 73 int ret; 74 75 ret = clk_prepare_enable(d_phy->usb20_clk); 76 if (ret) 77 return ret; 78 79 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0); 80 81 return 0; 82 } 83 84 static int da8xx_usb20_phy_power_off(struct phy *phy) 85 { 86 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 87 88 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 89 CFGCHIP2_OTGPWRDN); 90 91 clk_disable_unprepare(d_phy->usb20_clk); 92 93 return 0; 94 } 95 96 static int da8xx_usb20_phy_set_mode(struct phy *phy, enum phy_mode mode) 97 { 98 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 99 u32 val; 100 101 switch (mode) { 102 case PHY_MODE_USB_HOST: /* Force VBUS valid, ID = 0 */ 103 val = CFGCHIP2_OTGMODE_FORCE_HOST; 104 break; 105 case PHY_MODE_USB_DEVICE: /* Force VBUS valid, ID = 1 */ 106 val = CFGCHIP2_OTGMODE_FORCE_DEVICE; 107 break; 108 case PHY_MODE_USB_OTG: /* Don't override the VBUS/ID comparators */ 109 val = CFGCHIP2_OTGMODE_NO_OVERRIDE; 110 break; 111 default: 112 return -EINVAL; 113 } 114 115 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK, 116 val); 117 118 return 0; 119 } 120 121 static const struct phy_ops da8xx_usb20_phy_ops = { 122 .power_on = da8xx_usb20_phy_power_on, 123 .power_off = da8xx_usb20_phy_power_off, 124 .set_mode = da8xx_usb20_phy_set_mode, 125 .owner = THIS_MODULE, 126 }; 127 128 static struct phy *da8xx_usb_phy_of_xlate(struct device *dev, 129 struct of_phandle_args *args) 130 { 131 struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); 132 133 if (!d_phy) 134 return ERR_PTR(-ENODEV); 135 136 switch (args->args[0]) { 137 case 0: 138 return d_phy->usb20_phy; 139 case 1: 140 return d_phy->usb11_phy; 141 default: 142 return ERR_PTR(-EINVAL); 143 } 144 } 145 146 static int da8xx_usb_phy_probe(struct platform_device *pdev) 147 { 148 struct device *dev = &pdev->dev; 149 struct da8xx_usb_phy_platform_data *pdata = dev->platform_data; 150 struct device_node *node = dev->of_node; 151 struct da8xx_usb_phy *d_phy; 152 153 d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL); 154 if (!d_phy) 155 return -ENOMEM; 156 157 if (pdata) 158 d_phy->regmap = pdata->cfgchip; 159 else 160 d_phy->regmap = syscon_regmap_lookup_by_compatible( 161 "ti,da830-cfgchip"); 162 if (IS_ERR(d_phy->regmap)) { 163 dev_err(dev, "Failed to get syscon\n"); 164 return PTR_ERR(d_phy->regmap); 165 } 166 167 d_phy->usb11_clk = devm_clk_get(dev, "usb1_clk48"); 168 if (IS_ERR(d_phy->usb11_clk)) { 169 dev_err(dev, "Failed to get usb1_clk48\n"); 170 return PTR_ERR(d_phy->usb11_clk); 171 } 172 173 d_phy->usb20_clk = devm_clk_get(dev, "usb0_clk48"); 174 if (IS_ERR(d_phy->usb20_clk)) { 175 dev_err(dev, "Failed to get usb0_clk48\n"); 176 return PTR_ERR(d_phy->usb20_clk); 177 } 178 179 d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops); 180 if (IS_ERR(d_phy->usb11_phy)) { 181 dev_err(dev, "Failed to create usb11 phy\n"); 182 return PTR_ERR(d_phy->usb11_phy); 183 } 184 185 d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops); 186 if (IS_ERR(d_phy->usb20_phy)) { 187 dev_err(dev, "Failed to create usb20 phy\n"); 188 return PTR_ERR(d_phy->usb20_phy); 189 } 190 191 platform_set_drvdata(pdev, d_phy); 192 phy_set_drvdata(d_phy->usb11_phy, d_phy); 193 phy_set_drvdata(d_phy->usb20_phy, d_phy); 194 195 if (node) { 196 d_phy->phy_provider = devm_of_phy_provider_register(dev, 197 da8xx_usb_phy_of_xlate); 198 if (IS_ERR(d_phy->phy_provider)) { 199 dev_err(dev, "Failed to create phy provider\n"); 200 return PTR_ERR(d_phy->phy_provider); 201 } 202 } else { 203 int ret; 204 205 ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy", 206 "ohci-da8xx"); 207 if (ret) 208 dev_warn(dev, "Failed to create usb11 phy lookup\n"); 209 ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy", 210 "musb-da8xx"); 211 if (ret) 212 dev_warn(dev, "Failed to create usb20 phy lookup\n"); 213 } 214 215 regmap_write_bits(d_phy->regmap, CFGCHIP(2), 216 PHY_INIT_BITS, PHY_INIT_BITS); 217 218 return 0; 219 } 220 221 static int da8xx_usb_phy_remove(struct platform_device *pdev) 222 { 223 struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev); 224 225 if (!pdev->dev.of_node) { 226 phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx"); 227 phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci-da8xx"); 228 } 229 230 return 0; 231 } 232 233 static const struct of_device_id da8xx_usb_phy_ids[] = { 234 { .compatible = "ti,da830-usb-phy" }, 235 { } 236 }; 237 MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids); 238 239 static struct platform_driver da8xx_usb_phy_driver = { 240 .probe = da8xx_usb_phy_probe, 241 .remove = da8xx_usb_phy_remove, 242 .driver = { 243 .name = "da8xx-usb-phy", 244 .of_match_table = da8xx_usb_phy_ids, 245 }, 246 }; 247 248 module_platform_driver(da8xx_usb_phy_driver); 249 250 MODULE_ALIAS("platform:da8xx-usb-phy"); 251 MODULE_AUTHOR("David Lechner <david@lechnology.com>"); 252 MODULE_DESCRIPTION("TI DA8xx USB PHY driver"); 253 MODULE_LICENSE("GPL v2"); 254