drivers/phy/phy-da8xx-usb.c

   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");