// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *      phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs.
 *
 *      Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/phy/phy.h>
#include <linux/io.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>

struct priv {
        struct clk      *clk;
        void __iomem    *base;
};

#define SATA_PHY_MODE_2 0x0330
#define  MODE_2_FORCE_PU_TX     BIT(0)
#define  MODE_2_FORCE_PU_RX     BIT(1)
#define  MODE_2_PU_PLL          BIT(2)
#define  MODE_2_PU_IVREF        BIT(3)
#define SATA_IF_CTRL    0x0050
#define  CTRL_PHY_SHUTDOWN      BIT(9)

static int phy_mvebu_sata_power_on(struct phy *phy)
{
        struct priv *priv = phy_get_drvdata(phy);
        u32 reg;

        clk_prepare_enable(priv->clk);

        /* Enable PLL and IVREF */
        reg = readl(priv->base + SATA_PHY_MODE_2);
        reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
                MODE_2_PU_PLL | MODE_2_PU_IVREF);
        writel(reg , priv->base + SATA_PHY_MODE_2);

        /* Enable PHY */
        reg = readl(priv->base + SATA_IF_CTRL);
        reg &= ~CTRL_PHY_SHUTDOWN;
        writel(reg, priv->base + SATA_IF_CTRL);

        clk_disable_unprepare(priv->clk);

        return 0;
}

static int phy_mvebu_sata_power_off(struct phy *phy)
{
        struct priv *priv = phy_get_drvdata(phy);
        u32 reg;

        clk_prepare_enable(priv->clk);

        /* Disable PLL and IVREF */
        reg = readl(priv->base + SATA_PHY_MODE_2);
        reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX |
                 MODE_2_PU_PLL | MODE_2_PU_IVREF);
        writel(reg, priv->base + SATA_PHY_MODE_2);

        /* Disable PHY */
        reg = readl(priv->base + SATA_IF_CTRL);
        reg |= CTRL_PHY_SHUTDOWN;
        writel(reg, priv->base + SATA_IF_CTRL);

        clk_disable_unprepare(priv->clk);

        return 0;
}

static const struct phy_ops phy_mvebu_sata_ops = {
        .power_on       = phy_mvebu_sata_power_on,
        .power_off      = phy_mvebu_sata_power_off,
        .owner          = THIS_MODULE,
};

static int phy_mvebu_sata_probe(struct platform_device *pdev)
{
        struct phy_provider *phy_provider;
        struct priv *priv;
        struct phy *phy;

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

        priv->base = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(priv->base))
                return PTR_ERR(priv->base);

        priv->clk = devm_clk_get(&pdev->dev, "sata");
        if (IS_ERR(priv->clk))
                return PTR_ERR(priv->clk);

        phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops);
        if (IS_ERR(phy))
                return PTR_ERR(phy);

        phy_set_drvdata(phy, priv);

        phy_provider = devm_of_phy_provider_register(&pdev->dev,
                                                     of_phy_simple_xlate);
        if (IS_ERR(phy_provider))
                return PTR_ERR(phy_provider);

        /* The boot loader may of left it on. Turn it off. */
        phy_mvebu_sata_power_off(phy);

        return 0;
}

static const struct of_device_id phy_mvebu_sata_of_match[] = {
        { .compatible = "marvell,mvebu-sata-phy" },
        { },
};

static struct platform_driver phy_mvebu_sata_driver = {
        .probe  = phy_mvebu_sata_probe,
        .driver = {
                .name   = "phy-mvebu-sata",
                .of_match_table = phy_mvebu_sata_of_match,
        }
};
builtin_platform_driver(phy_mvebu_sata_driver);