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, 97 enum phy_mode mode, int submode) 98 { 99 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy); 100 u32 val; 101 102 switch (mode) { 103 case PHY_MODE_USB_HOST: /* Force VBUS valid, ID = 0 */ 104 val = CFGCHIP2_OTGMODE_FORCE_HOST; 105 break; 106 case PHY_MODE_USB_DEVICE: /* Force VBUS valid, ID = 1 */ 107 val = CFGCHIP2_OTGMODE_FORCE_DEVICE; 108 break; 109 case PHY_MODE_USB_OTG: /* Don't override the VBUS/ID comparators */ 110 val = CFGCHIP2_OTGMODE_NO_OVERRIDE; 111 break; 112 default: 113 return -EINVAL; 114 } 115 116 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK, 117 val); 118 119 return 0; 120 } 121 122 static const struct phy_ops da8xx_usb20_phy_ops = { 123 .power_on = da8xx_usb20_phy_power_on, 124 .power_off = da8xx_usb20_phy_power_off, 125 .set_mode = da8xx_usb20_phy_set_mode, 126 .owner = THIS_MODULE, 127 }; 128 129 static struct phy *da8xx_usb_phy_of_xlate(struct device *dev, 130 struct of_phandle_args *args) 131 { 132 struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev); 133 134 if (!d_phy) 135 return ERR_PTR(-ENODEV); 136 137 switch (args->args[0]) { 138 case 0: 139 return d_phy->usb20_phy; 140 case 1: 141 return d_phy->usb11_phy; 142 default: 143 return ERR_PTR(-EINVAL); 144 } 145 } 146 147 static int da8xx_usb_phy_probe(struct platform_device *pdev) 148 { 149 struct device *dev = &pdev->dev; 150 struct da8xx_usb_phy_platform_data *pdata = dev->platform_data; 151 struct device_node *node = dev->of_node; 152 struct da8xx_usb_phy *d_phy; 153 154 d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL); 155 if (!d_phy) 156 return -ENOMEM; 157 158 if (pdata) 159 d_phy->regmap = pdata->cfgchip; 160 else 161 d_phy->regmap = syscon_regmap_lookup_by_compatible( 162 "ti,da830-cfgchip"); 163 if (IS_ERR(d_phy->regmap)) { 164 dev_err(dev, "Failed to get syscon\n"); 165 return PTR_ERR(d_phy->regmap); 166 } 167 168 d_phy->usb11_clk = devm_clk_get(dev, "usb1_clk48"); 169 if (IS_ERR(d_phy->usb11_clk)) { 170 dev_err(dev, "Failed to get usb1_clk48\n"); 171 return PTR_ERR(d_phy->usb11_clk); 172 } 173 174 d_phy->usb20_clk = devm_clk_get(dev, "usb0_clk48"); 175 if (IS_ERR(d_phy->usb20_clk)) { 176 dev_err(dev, "Failed to get usb0_clk48\n"); 177 return PTR_ERR(d_phy->usb20_clk); 178 } 179 180 d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops); 181 if (IS_ERR(d_phy->usb11_phy)) { 182 dev_err(dev, "Failed to create usb11 phy\n"); 183 return PTR_ERR(d_phy->usb11_phy); 184 } 185 186 d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops); 187 if (IS_ERR(d_phy->usb20_phy)) { 188 dev_err(dev, "Failed to create usb20 phy\n"); 189 return PTR_ERR(d_phy->usb20_phy); 190 } 191 192 platform_set_drvdata(pdev, d_phy); 193 phy_set_drvdata(d_phy->usb11_phy, d_phy); 194 phy_set_drvdata(d_phy->usb20_phy, d_phy); 195 196 if (node) { 197 d_phy->phy_provider = devm_of_phy_provider_register(dev, 198 da8xx_usb_phy_of_xlate); 199 if (IS_ERR(d_phy->phy_provider)) { 200 dev_err(dev, "Failed to create phy provider\n"); 201 return PTR_ERR(d_phy->phy_provider); 202 } 203 } else { 204 int ret; 205 206 ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy", 207 "ohci-da8xx"); 208 if (ret) 209 dev_warn(dev, "Failed to create usb11 phy lookup\n"); 210 ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy", 211 "musb-da8xx"); 212 if (ret) 213 dev_warn(dev, "Failed to create usb20 phy lookup\n"); 214 } 215 216 regmap_write_bits(d_phy->regmap, CFGCHIP(2), 217 PHY_INIT_BITS, PHY_INIT_BITS); 218 219 return 0; 220 } 221 222 static int da8xx_usb_phy_remove(struct platform_device *pdev) 223 { 224 struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev); 225 226 if (!pdev->dev.of_node) { 227 phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx"); 228 phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci-da8xx"); 229 } 230 231 return 0; 232 } 233 234 static const struct of_device_id da8xx_usb_phy_ids[] = { 235 { .compatible = "ti,da830-usb-phy" }, 236 { } 237 }; 238 MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids); 239 240 static struct platform_driver da8xx_usb_phy_driver = { 241 .probe = da8xx_usb_phy_probe, 242 .remove = da8xx_usb_phy_remove, 243 .driver = { 244 .name = "da8xx-usb-phy", 245 .of_match_table = da8xx_usb_phy_ids, 246 }, 247 }; 248 249 module_platform_driver(da8xx_usb_phy_driver); 250 251 MODULE_ALIAS("platform:da8xx-usb-phy"); 252 MODULE_AUTHOR("David Lechner <david@lechnology.com>"); 253 MODULE_DESCRIPTION("TI DA8xx USB PHY driver"); 254 MODULE_LICENSE("GPL v2"); 255