drivers/regulator/uniphier-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Regulator controller driver for UniPhier SoC
   4 // Copyright 2018 Socionext Inc.
   5 // Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
   6
   7 #include <linux/clk.h>
   8 #include <linux/io.h>
   9 #include <linux/module.h>
  10 #include <linux/of_device.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/driver.h>
  14 #include <linux/regulator/of_regulator.h>
  15 #include <linux/reset.h>
  16
  17 #define MAX_CLKS        2
  18 #define MAX_RSTS        2
  19
  20 struct uniphier_regulator_soc_data {
  21         int nclks;
  22         const char * const *clock_names;
  23         int nrsts;
  24         const char * const *reset_names;
  25         const struct regulator_desc *desc;
  26         const struct regmap_config *regconf;
  27 };
  28
  29 struct uniphier_regulator_priv {
  30         struct clk_bulk_data clk[MAX_CLKS];
  31         struct reset_control *rst[MAX_RSTS];
  32         const struct uniphier_regulator_soc_data *data;
  33 };
  34
  35 static const struct regulator_ops uniphier_regulator_ops = {
  36         .enable     = regulator_enable_regmap,
  37         .disable    = regulator_disable_regmap,
  38         .is_enabled = regulator_is_enabled_regmap,
  39 };
  40
  41 static int uniphier_regulator_probe(struct platform_device *pdev)
  42 {
  43         struct device *dev = &pdev->dev;
  44         struct uniphier_regulator_priv *priv;
  45         struct regulator_config config = { };
  46         struct regulator_dev *rdev;
  47         struct regmap *regmap;
  48         struct resource *res;
  49         void __iomem *base;
  50         const char *name;
  51         int i, ret, nr;
  52
  53         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  54         if (!priv)
  55                 return -ENOMEM;
  56
  57         priv->data = of_device_get_match_data(dev);
  58         if (WARN_ON(!priv->data))
  59                 return -EINVAL;
  60
  61         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  62         base = devm_ioremap_resource(dev, res);
  63         if (IS_ERR(base))
  64                 return PTR_ERR(base);
  65
  66         for (i = 0; i < priv->data->nclks; i++)
  67                 priv->clk[i].id = priv->data->clock_names[i];
  68         ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
  69         if (ret)
  70                 return ret;
  71
  72         for (i = 0; i < priv->data->nrsts; i++) {
  73                 name = priv->data->reset_names[i];
  74                 priv->rst[i] = devm_reset_control_get_shared(dev, name);
  75                 if (IS_ERR(priv->rst[i]))
  76                         return PTR_ERR(priv->rst[i]);
  77         }
  78
  79         ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
  80         if (ret)
  81                 return ret;
  82
  83         for (nr = 0; nr < priv->data->nrsts; nr++) {
  84                 ret = reset_control_deassert(priv->rst[nr]);
  85                 if (ret)
  86                         goto out_rst_assert;
  87         }
  88
  89         regmap = devm_regmap_init_mmio(dev, base, priv->data->regconf);
  90         if (IS_ERR(regmap)) {
  91                 ret = PTR_ERR(regmap);
  92                 goto out_rst_assert;
  93         }
  94
  95         config.dev = dev;
  96         config.driver_data = priv;
  97         config.of_node = dev->of_node;
  98         config.regmap = regmap;
  99         config.init_data = of_get_regulator_init_data(dev, dev->of_node,
 100                                                       priv->data->desc);
 101         rdev = devm_regulator_register(dev, priv->data->desc, &config);
 102         if (IS_ERR(rdev)) {
 103                 ret = PTR_ERR(rdev);
 104                 goto out_rst_assert;
 105         }
 106
 107         platform_set_drvdata(pdev, priv);
 108
 109         return 0;
 110
 111 out_rst_assert:
 112         while (nr--)
 113                 reset_control_assert(priv->rst[nr]);
 114
 115         clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
 116
 117         return ret;
 118 }
 119
 120 static int uniphier_regulator_remove(struct platform_device *pdev)
 121 {
 122         struct uniphier_regulator_priv *priv = platform_get_drvdata(pdev);
 123         int i;
 124
 125         for (i = 0; i < priv->data->nrsts; i++)
 126                 reset_control_assert(priv->rst[i]);
 127
 128         clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
 129
 130         return 0;
 131 }
 132
 133 /* USB3 controller data */
 134 #define USB3VBUS_OFFSET         0x0
 135 #define USB3VBUS_REG            BIT(4)
 136 #define USB3VBUS_REG_EN         BIT(3)
 137 static const struct regulator_desc uniphier_usb3_regulator_desc = {
 138         .name = "vbus",
 139         .of_match = of_match_ptr("vbus"),
 140         .ops = &uniphier_regulator_ops,
 141         .type = REGULATOR_VOLTAGE,
 142         .owner = THIS_MODULE,
 143         .enable_reg  = USB3VBUS_OFFSET,
 144         .enable_mask = USB3VBUS_REG_EN | USB3VBUS_REG,
 145         .enable_val  = USB3VBUS_REG_EN | USB3VBUS_REG,
 146         .disable_val = USB3VBUS_REG_EN,
 147 };
 148
 149 static const struct regmap_config uniphier_usb3_regulator_regconf = {
 150         .reg_bits = 32,
 151         .val_bits = 32,
 152         .reg_stride = 4,
 153         .max_register = 1,
 154 };
 155
 156 static const char * const uniphier_pro4_clock_reset_names[] = {
 157         "gio", "link",
 158 };
 159
 160 static const struct uniphier_regulator_soc_data uniphier_pro4_usb3_data = {
 161         .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
 162         .clock_names = uniphier_pro4_clock_reset_names,
 163         .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
 164         .reset_names = uniphier_pro4_clock_reset_names,
 165         .desc = &uniphier_usb3_regulator_desc,
 166         .regconf = &uniphier_usb3_regulator_regconf,
 167 };
 168
 169 static const char * const uniphier_pxs2_clock_reset_names[] = {
 170         "link",
 171 };
 172
 173 static const struct uniphier_regulator_soc_data uniphier_pxs2_usb3_data = {
 174         .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
 175         .clock_names = uniphier_pxs2_clock_reset_names,
 176         .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
 177         .reset_names = uniphier_pxs2_clock_reset_names,
 178         .desc = &uniphier_usb3_regulator_desc,
 179         .regconf = &uniphier_usb3_regulator_regconf,
 180 };
 181
 182 static const struct of_device_id uniphier_regulator_match[] = {
 183         /* USB VBUS */
 184         {
 185                 .compatible = "socionext,uniphier-pro4-usb3-regulator",
 186                 .data = &uniphier_pro4_usb3_data,
 187         },
 188         {
 189                 .compatible = "socionext,uniphier-pxs2-usb3-regulator",
 190                 .data = &uniphier_pxs2_usb3_data,
 191         },
 192         {
 193                 .compatible = "socionext,uniphier-ld20-usb3-regulator",
 194                 .data = &uniphier_pxs2_usb3_data,
 195         },
 196         {
 197                 .compatible = "socionext,uniphier-pxs3-usb3-regulator",
 198                 .data = &uniphier_pxs2_usb3_data,
 199         },
 200         { /* Sentinel */ },
 201 };
 202
 203 static struct platform_driver uniphier_regulator_driver = {
 204         .probe = uniphier_regulator_probe,
 205         .remove = uniphier_regulator_remove,
 206         .driver = {
 207                 .name  = "uniphier-regulator",
 208                 .of_match_table = uniphier_regulator_match,
 209         },
 210 };
 211 module_platform_driver(uniphier_regulator_driver);
 212
 213 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
 214 MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
 215 MODULE_LICENSE("GPL");