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/*
 * Copyright (c) 2015 Linaro Ltd.
 * Copyright (c) 2015 Hisilicon Limited.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/mfd/syscon.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 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_ALIAS("platform:hi6220-usb-phy");
MODULE_LICENSE("GPL");