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