// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2015 Linaro Ltd.
 * Copyright (c) 2015 HiSilicon Limited.
 */

#include <linux/mfd/syscon.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>

#define SC_PERIPH_CTRL4                 0x00c

#define CTRL4_PICO_SIDDQ                BIT(6)
#define CTRL4_PICO_OGDISABLE            BIT(8)
#define CTRL4_PICO_VBUSVLDEXT           BIT(10)
#define CTRL4_PICO_VBUSVLDEXTSEL        BIT(11)
#define CTRL4_OTG_PHY_SEL               BIT(21)

#define SC_PERIPH_CTRL5                 0x010

#define CTRL5_USBOTG_RES_SEL            BIT(3)
#define CTRL5_PICOPHY_ACAENB            BIT(4)
#define CTRL5_PICOPHY_BC_MODE           BIT(5)
#define CTRL5_PICOPHY_CHRGSEL           BIT(6)
#define CTRL5_PICOPHY_VDATSRCEND        BIT(7)
#define CTRL5_PICOPHY_VDATDETENB        BIT(8)
#define CTRL5_PICOPHY_DCDENB            BIT(9)
#define CTRL5_PICOPHY_IDDIG             BIT(10)

#define SC_PERIPH_CTRL8                 0x018
#define SC_PERIPH_RSTEN0                0x300
#define SC_PERIPH_RSTDIS0               0x304

#define RST0_USBOTG_BUS                 BIT(4)
#define RST0_POR_PICOPHY                BIT(5)
#define RST0_USBOTG                     BIT(6)
#define RST0_USBOTG_32K                 BIT(7)

#define EYE_PATTERN_PARA                0x7053348c

struct hi6220_priv {
        struct regmap *reg;
        struct device *dev;
};

static void hi6220_phy_init(struct hi6220_priv *priv)
{
        struct regmap *reg = priv->reg;
        u32 val, mask;

        val = RST0_USBOTG_BUS | RST0_POR_PICOPHY |
              RST0_USBOTG | RST0_USBOTG_32K;
        mask = val;
        regmap_update_bits(reg, SC_PERIPH_RSTEN0, mask, val);
        regmap_update_bits(reg, SC_PERIPH_RSTDIS0, mask, val);
}

static int hi6220_phy_setup(struct hi6220_priv *priv, bool on)
{
        struct regmap *reg = priv->reg;
        u32 val, mask;
        int ret;

        if (on) {
                val = CTRL5_USBOTG_RES_SEL | CTRL5_PICOPHY_ACAENB;
                mask = val | CTRL5_PICOPHY_BC_MODE;
                ret = regmap_update_bits(reg, SC_PERIPH_CTRL5, mask, val);
                if (ret)
                        goto out;

                val =  CTRL4_PICO_VBUSVLDEXT | CTRL4_PICO_VBUSVLDEXTSEL |
                       CTRL4_OTG_PHY_SEL;
                mask = val | CTRL4_PICO_SIDDQ | CTRL4_PICO_OGDISABLE;
                ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
                if (ret)
                        goto out;

                ret = regmap_write(reg, SC_PERIPH_CTRL8, EYE_PATTERN_PARA);
                if (ret)
                        goto out;
        } else {
                val = CTRL4_PICO_SIDDQ;
                mask = val;
                ret = regmap_update_bits(reg, SC_PERIPH_CTRL4, mask, val);
                if (ret)
                        goto out;
        }

        return 0;
out:
        dev_err(priv->dev, "failed to setup phy ret: %d\n", ret);
        return ret;
}

static int hi6220_phy_start(struct phy *phy)
{
        struct hi6220_priv *priv = phy_get_drvdata(phy);

        return hi6220_phy_setup(priv, true);
}

static int hi6220_phy_exit(struct phy *phy)
{
        struct hi6220_priv *priv = phy_get_drvdata(phy);

        return hi6220_phy_setup(priv, false);
}

static const struct phy_ops hi6220_phy_ops = {
        .init           = hi6220_phy_start,
        .exit           = hi6220_phy_exit,
        .owner          = THIS_MODULE,
};

static int hi6220_phy_probe(struct platform_device *pdev)
{
        struct phy_provider *phy_provider;
        struct device *dev = &pdev->dev;
        struct phy *phy;
        struct hi6220_priv *priv;

        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
        if (!priv)
                return -ENOMEM;

        priv->dev = dev;
        priv->reg = syscon_regmap_lookup_by_phandle(dev->of_node,
                                        "hisilicon,peripheral-syscon");
        if (IS_ERR(priv->reg)) {
                dev_err(dev, "no hisilicon,peripheral-syscon\n");
                return PTR_ERR(priv->reg);
        }

        hi6220_phy_init(priv);

        phy = devm_phy_create(dev, NULL, &hi6220_phy_ops);
        if (IS_ERR(phy))
                return PTR_ERR(phy);

        phy_set_drvdata(phy, priv);
        phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
        return PTR_ERR_OR_ZERO(phy_provider);
}

static const struct of_device_id hi6220_phy_of_match[] = {
        {.compatible = "hisilicon,hi6220-usb-phy",},
        { },
};
MODULE_DEVICE_TABLE(of, hi6220_phy_of_match);

static struct platform_driver hi6220_phy_driver = {
        .probe  = hi6220_phy_probe,
        .driver = {
                .name   = "hi6220-usb-phy",
                .of_match_table = hi6220_phy_of_match,
        }
};
module_platform_driver(hi6220_phy_driver);

MODULE_DESCRIPTION("HISILICON HI6220 USB PHY driver");
MODULE_LICENSE("GPL");