drivers/phy/ti/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_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");