// SPDX-License-Identifier: GPL-2.0
/*
 * phy-uniphier-usb2.c - PHY driver for UniPhier USB2 controller
 * Copyright 2015-2018 Socionext Inc.
 * Author:
 *      Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
 */

#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>

#define SG_USBPHY1CTRL          0x500
#define SG_USBPHY1CTRL2         0x504
#define SG_USBPHY2CTRL          0x508
#define SG_USBPHY2CTRL2         0x50c   /* LD11 */
#define SG_USBPHY12PLL          0x50c   /* Pro4 */
#define SG_USBPHY3CTRL          0x510
#define SG_USBPHY3CTRL2         0x514
#define SG_USBPHY4CTRL          0x518   /* Pro4 */
#define SG_USBPHY4CTRL2         0x51c   /* Pro4 */
#define SG_USBPHY34PLL          0x51c   /* Pro4 */

struct uniphier_u2phy_param {
        u32 offset;
        u32 value;
};

struct uniphier_u2phy_soc_data {
        struct uniphier_u2phy_param config0;
        struct uniphier_u2phy_param config1;
};

struct uniphier_u2phy_priv {
        struct regmap *regmap;
        struct phy *phy;
        struct regulator *vbus;
        const struct uniphier_u2phy_soc_data *data;
        struct uniphier_u2phy_priv *next;
};

static int uniphier_u2phy_power_on(struct phy *phy)
{
        struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);
        int ret = 0;

        if (priv->vbus)
                ret = regulator_enable(priv->vbus);

        return ret;
}

static int uniphier_u2phy_power_off(struct phy *phy)
{
        struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);

        if (priv->vbus)
                regulator_disable(priv->vbus);

        return 0;
}

static int uniphier_u2phy_init(struct phy *phy)
{
        struct uniphier_u2phy_priv *priv = phy_get_drvdata(phy);

        if (!priv->data)
                return 0;

        regmap_write(priv->regmap, priv->data->config0.offset,
                     priv->data->config0.value);
        regmap_write(priv->regmap, priv->data->config1.offset,
                     priv->data->config1.value);

        return 0;
}

static struct phy *uniphier_u2phy_xlate(struct device *dev,
                                        const struct of_phandle_args *args)
{
        struct uniphier_u2phy_priv *priv = dev_get_drvdata(dev);

        while (priv && args->np != priv->phy->dev.of_node)
                priv = priv->next;

        if (!priv) {
                dev_err(dev, "Failed to find appropriate phy\n");
                return ERR_PTR(-EINVAL);
        }

        return priv->phy;
}

static const struct phy_ops uniphier_u2phy_ops = {
        .init      = uniphier_u2phy_init,
        .power_on  = uniphier_u2phy_power_on,
        .power_off = uniphier_u2phy_power_off,
        .owner = THIS_MODULE,
};

static int uniphier_u2phy_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct device_node *parent;
        struct uniphier_u2phy_priv *priv = NULL, *next = NULL;
        struct phy_provider *phy_provider;
        struct regmap *regmap;
        const struct uniphier_u2phy_soc_data *data;
        int ret, data_idx, ndatas;

        data = of_device_get_match_data(dev);
        if (WARN_ON(!data))
                return -EINVAL;

        /* get number of data */
        for (ndatas = 0; data[ndatas].config0.offset; ndatas++)
                ;

        parent = of_get_parent(dev->of_node);
        regmap = syscon_node_to_regmap(parent);
        of_node_put(parent);
        if (IS_ERR(regmap)) {
                dev_err(dev, "Failed to get regmap\n");
                return PTR_ERR(regmap);
        }

        for_each_child_of_node_scoped(dev->of_node, child) {
                priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
                if (!priv)
                        return -ENOMEM;

                priv->regmap = regmap;

                priv->vbus = devm_regulator_get_optional(dev, "vbus");
                if (IS_ERR(priv->vbus)) {
                        if (PTR_ERR(priv->vbus) == -EPROBE_DEFER)
                                return PTR_ERR(priv->vbus);

                        priv->vbus = NULL;
                }

                priv->phy = devm_phy_create(dev, child, &uniphier_u2phy_ops);
                if (IS_ERR(priv->phy)) {
                        dev_err(dev, "Failed to create phy\n");
                        return PTR_ERR(priv->phy);
                }

                ret = of_property_read_u32(child, "reg", &data_idx);
                if (ret) {
                        dev_err(dev, "Failed to get reg property\n");
                        return ret;
                }

                if (data_idx < ndatas)
                        priv->data = &data[data_idx];
                else
                        dev_warn(dev, "No phy configuration: %s\n",
                                 child->full_name);

                phy_set_drvdata(priv->phy, priv);
                priv->next = next;
                next = priv;
        }

        dev_set_drvdata(dev, priv);
        phy_provider = devm_of_phy_provider_register(dev,
                                                     uniphier_u2phy_xlate);
        return PTR_ERR_OR_ZERO(phy_provider);
}

static const struct uniphier_u2phy_soc_data uniphier_pro4_data[] = {
        {
                .config0 = { SG_USBPHY1CTRL, 0x05142400 },
                .config1 = { SG_USBPHY12PLL, 0x00010010 },
        },
        {
                .config0 = { SG_USBPHY2CTRL, 0x05142400 },
                .config1 = { SG_USBPHY12PLL, 0x00010010 },
        },
        {
                .config0 = { SG_USBPHY3CTRL, 0x05142400 },
                .config1 = { SG_USBPHY34PLL, 0x00010010 },
        },
        {
                .config0 = { SG_USBPHY4CTRL, 0x05142400 },
                .config1 = { SG_USBPHY34PLL, 0x00010010 },
        },
        { /* sentinel */ }
};

static const struct uniphier_u2phy_soc_data uniphier_ld11_data[] = {
        {
                .config0 = { SG_USBPHY1CTRL,  0x82280000 },
                .config1 = { SG_USBPHY1CTRL2, 0x00000106 },
        },
        {
                .config0 = { SG_USBPHY2CTRL,  0x82280000 },
                .config1 = { SG_USBPHY2CTRL2, 0x00000106 },
        },
        {
                .config0 = { SG_USBPHY3CTRL,  0x82280000 },
                .config1 = { SG_USBPHY3CTRL2, 0x00000106 },
        },
        { /* sentinel */ }
};

static const struct of_device_id uniphier_u2phy_match[] = {
        {
                .compatible = "socionext,uniphier-pro4-usb2-phy",
                .data = &uniphier_pro4_data,
        },
        {
                .compatible = "socionext,uniphier-ld11-usb2-phy",
                .data = &uniphier_ld11_data,
        },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, uniphier_u2phy_match);

static struct platform_driver uniphier_u2phy_driver = {
        .probe = uniphier_u2phy_probe,
        .driver = {
                .name = "uniphier-usb2-phy",
                .of_match_table = uniphier_u2phy_match,
        },
};
module_platform_driver(uniphier_u2phy_driver);

MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
MODULE_DESCRIPTION("UniPhier PHY driver for USB2 controller");
MODULE_LICENSE("GPL v2");