drivers/phy/socionext/phy-uniphier-usb2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * phy-uniphier-usb2.c - PHY driver for UniPhier USB2 controller
   4  * Copyright 2015-2018 Socionext Inc.
   5  * Author:
   6  *      Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
   7  */
   8
   9 #include <linux/mfd/syscon.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/of_platform.h>
  13 #include <linux/phy/phy.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regmap.h>
  16 #include <linux/regulator/consumer.h>
  17
  18 #define SG_USBPHY1CTRL          0x500
  19 #define SG_USBPHY1CTRL2         0x504
  20 #define SG_USBPHY2CTRL          0x508
  21 #define SG_USBPHY2CTRL2         0x50c   /* LD11 */
  22 #define SG_USBPHY12PLL          0x50c   /* Pro4 */
  23 #define SG_USBPHY3CTRL          0x510
  24 #define SG_USBPHY3CTRL2         0x514
  25 #define SG_USBPHY4CTRL          0x518   /* Pro4 */
  26 #define SG_USBPHY4CTRL2         0x51c   /* Pro4 */
  27 #define SG_USBPHY34PLL          0x51c   /* Pro4 */
  28
  29 struct uniphier_u2phy_param {
  30         u32 offset;
  31         u32 value;
  32 };
  33
  34 struct uniphier_u2phy_soc_data {
  35         struct uniphier_u2phy_param config0;
  36         struct uniphier_u2phy_param config1;
  37 };
  38
  39 struct uniphier_u2phy_priv {
  40         struct regmap *regmap;
  41         struct phy *phy;
  42         struct regulator *vbus;
  43         const struct uniphier_u2phy_soc_data *data;
  44         struct uniphier_u2phy_priv *next;
  45 };
  46
  47 static int uniphier_u2phy_power_on(struct phy *phy)
  48 {
  49         struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);
  50         int ret = 0;
  51
  52         if (priv->vbus)
  53                 ret = regulator_enable(priv->vbus);
  54
  55         return ret;
  56 }
  57
  58 static int uniphier_u2phy_power_off(struct phy *phy)
  59 {
  60         struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);
  61
  62         if (priv->vbus)
  63                 regulator_disable(priv->vbus);
  64
  65         return 0;
  66 }
  67
  68 static int uniphier_u2phy_init(struct phy *phy)
  69 {
  70         struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);
  71
  72         if (!priv->data)
  73                 return 0;
  74
  75         regmap_write(priv->regmap, priv->data->config0.offset,
  76                      priv->data->config0.value);
  77         regmap_write(priv->regmap, priv->data->config1.offset,
  78                      priv->data->config1.value);
  79
  80         return 0;
  81 }
  82
  83 static struct phy *uniphier_u2phy_xlate(struct device *dev,
  84                                         struct of_phandle_args *args)
  85 {
  86         struct uniphier_u2phy_priv *priv = dev_get_drvdata(dev);
  87
  88         while (priv && args->np != priv->phy->dev.of_node)
  89                 priv = priv->next;
  90
  91         if (!priv) {
  92                 dev_err(dev, "Failed to find appropriate phy\n");
  93                 return ERR_PTR(-EINVAL);
  94         }
  95
  96         return priv->phy;
  97 }
  98
  99 static const struct phy_ops uniphier_u2phy_ops = {
 100         .init      = uniphier_u2phy_init,
 101         .power_on  = uniphier_u2phy_power_on,
 102         .power_off = uniphier_u2phy_power_off,
 103         .owner = THIS_MODULE,
 104 };
 105
 106 static int uniphier_u2phy_probe(struct platform_device *pdev)
 107 {
 108         struct device *dev = &pdev->dev;
 109         struct device_node *parent, *child;
 110         struct uniphier_u2phy_priv *priv = NULL, *next = NULL;
 111         struct phy_provider *phy_provider;
 112         struct regmap *regmap;
 113         const struct uniphier_u2phy_soc_data *data;
 114         int ret, data_idx, ndatas;
 115
 116         data = of_device_get_match_data(dev);
 117         if (WARN_ON(!data))
 118                 return -EINVAL;
 119
 120         /* get number of data */
 121         for (ndatas = 0; data[ndatas].config0.offset; ndatas++)
 122                 ;
 123
 124         parent = of_get_parent(dev->of_node);
 125         regmap = syscon_node_to_regmap(parent);
 126         of_node_put(parent);
 127         if (IS_ERR(regmap)) {
 128                 dev_err(dev, "Failed to get regmap\n");
 129                 return PTR_ERR(regmap);
 130         }
 131
 132         for_each_child_of_node(dev->of_node, child) {
 133                 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 134                 if (!priv) {
 135                         ret = -ENOMEM;
 136                         goto out_put_child;
 137                 }
 138                 priv->regmap = regmap;
 139
 140                 priv->vbus = devm_regulator_get_optional(dev, "vbus");
 141                 if (IS_ERR(priv->vbus)) {
 142                         if (PTR_ERR(priv->vbus) == -EPROBE_DEFER) {
 143                                 ret = PTR_ERR(priv->vbus);
 144                                 goto out_put_child;
 145                         }
 146                         priv->vbus = NULL;
 147                 }
 148
 149                 priv->phy = devm_phy_create(dev, child, &uniphier_u2phy_ops);
 150                 if (IS_ERR(priv->phy)) {
 151                         dev_err(dev, "Failed to create phy\n");
 152                         ret = PTR_ERR(priv->phy);
 153                         goto out_put_child;
 154                 }
 155
 156                 ret = of_property_read_u32(child, "reg", &data_idx);
 157                 if (ret) {
 158                         dev_err(dev, "Failed to get reg property\n");
 159                         goto out_put_child;
 160                 }
 161
 162                 if (data_idx < ndatas)
 163                         priv->data = &data[data_idx];
 164                 else
 165                         dev_warn(dev, "No phy configuration: %s\n",
 166                                  child->full_name);
 167
 168                 phy_set_drvdata(priv->phy, priv);
 169                 priv->next = next;
 170                 next = priv;
 171         }
 172
 173         dev_set_drvdata(dev, priv);
 174         phy_provider = devm_of_phy_provider_register(dev,
 175                                                      uniphier_u2phy_xlate);
 176         return PTR_ERR_OR_ZERO(phy_provider);
 177
 178 out_put_child:
 179         of_node_put(child);
 180
 181         return ret;
 182 }
 183
 184 static const struct uniphier_u2phy_soc_data uniphier_pro4_data[] = {
 185         {
 186                 .config0 = { SG_USBPHY1CTRL, 0x05142400 },
 187                 .config1 = { SG_USBPHY12PLL, 0x00010010 },
 188         },
 189         {
 190                 .config0 = { SG_USBPHY2CTRL, 0x05142400 },
 191                 .config1 = { SG_USBPHY12PLL, 0x00010010 },
 192         },
 193         {
 194                 .config0 = { SG_USBPHY3CTRL, 0x05142400 },
 195                 .config1 = { SG_USBPHY34PLL, 0x00010010 },
 196         },
 197         {
 198                 .config0 = { SG_USBPHY4CTRL, 0x05142400 },
 199                 .config1 = { SG_USBPHY34PLL, 0x00010010 },
 200         },
 201         { /* sentinel */ }
 202 };
 203
 204 static const struct uniphier_u2phy_soc_data uniphier_ld11_data[] = {
 205         {
 206                 .config0 = { SG_USBPHY1CTRL,  0x82280000 },
 207                 .config1 = { SG_USBPHY1CTRL2, 0x00000106 },
 208         },
 209         {
 210                 .config0 = { SG_USBPHY2CTRL,  0x82280000 },
 211                 .config1 = { SG_USBPHY2CTRL2, 0x00000106 },
 212         },
 213         {
 214                 .config0 = { SG_USBPHY3CTRL,  0x82280000 },
 215                 .config1 = { SG_USBPHY3CTRL2, 0x00000106 },
 216         },
 217         { /* sentinel */ }
 218 };
 219
 220 static const struct of_device_id uniphier_u2phy_match[] = {
 221         {
 222                 .compatible = "socionext,uniphier-pro4-usb2-phy",
 223                 .data = &uniphier_pro4_data,
 224         },
 225         {
 226                 .compatible = "socionext,uniphier-ld11-usb2-phy",
 227                 .data = &uniphier_ld11_data,
 228         },
 229         { /* sentinel */ }
 230 };
 231 MODULE_DEVICE_TABLE(of, uniphier_u2phy_match);
 232
 233 static struct platform_driver uniphier_u2phy_driver = {
 234         .probe = uniphier_u2phy_probe,
 235         .driver = {
 236                 .name = "uniphier-usb2-phy",
 237                 .of_match_table = uniphier_u2phy_match,
 238         },
 239 };
 240 module_platform_driver(uniphier_u2phy_driver);
 241
 242 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
 243 MODULE_DESCRIPTION("UniPhier PHY driver for USB2 controller");
 244 MODULE_LICENSE("GPL v2");