/*
 * Copyright (C) 2014 Marvell Technology Group Ltd.
 *
 * Antoine Tenart <antoine.tenart@free-electrons.com>
 * Jisheng Zhang <jszhang@marvell.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/reset.h>

#define USB_PHY_PLL		0x04
#define USB_PHY_PLL_CONTROL	0x08
#define USB_PHY_TX_CTRL0	0x10
#define USB_PHY_TX_CTRL1	0x14
#define USB_PHY_TX_CTRL2	0x18
#define USB_PHY_RX_CTRL		0x20
#define USB_PHY_ANALOG		0x34

/* USB_PHY_PLL */
#define CLK_REF_DIV(x)		((x) << 4)
#define FEEDBACK_CLK_DIV(x)	((x) << 8)

/* USB_PHY_PLL_CONTROL */
#define CLK_STABLE		BIT(0)
#define PLL_CTRL_PIN		BIT(1)
#define PLL_CTRL_REG		BIT(2)
#define PLL_ON			BIT(3)
#define PHASE_OFF_TOL_125	(0x0 << 5)
#define PHASE_OFF_TOL_250	BIT(5)
#define KVC0_CALIB		(0x0 << 9)
#define KVC0_REG_CTRL		BIT(9)
#define KVC0_HIGH		(0x0 << 10)
#define KVC0_LOW		(0x3 << 10)
#define CLK_BLK_EN		BIT(13)

/* USB_PHY_TX_CTRL0 */
#define EXT_HS_RCAL_EN		BIT(3)
#define EXT_FS_RCAL_EN		BIT(4)
#define IMPCAL_VTH_DIV(x)	((x) << 5)
#define EXT_RS_RCAL_DIV(x)	((x) << 8)
#define EXT_FS_RCAL_DIV(x)	((x) << 12)

/* USB_PHY_TX_CTRL1 */
#define TX_VDD15_14		(0x0 << 4)
#define TX_VDD15_15		BIT(4)
#define TX_VDD15_16		(0x2 << 4)
#define TX_VDD15_17		(0x3 << 4)
#define TX_VDD12_VDD		(0x0 << 6)
#define TX_VDD12_11		BIT(6)
#define TX_VDD12_12		(0x2 << 6)
#define TX_VDD12_13		(0x3 << 6)
#define LOW_VDD_EN		BIT(8)
#define TX_OUT_AMP(x)		((x) << 9)

/* USB_PHY_TX_CTRL2 */
#define TX_CHAN_CTRL_REG(x)	((x) << 0)
#define DRV_SLEWRATE(x)		((x) << 4)
#define IMP_CAL_FS_HS_DLY_0	(0x0 << 6)
#define IMP_CAL_FS_HS_DLY_1	BIT(6)
#define IMP_CAL_FS_HS_DLY_2	(0x2 << 6)
#define IMP_CAL_FS_HS_DLY_3	(0x3 << 6)
#define FS_DRV_EN_MASK(x)	((x) << 8)
#define HS_DRV_EN_MASK(x)	((x) << 12)

/* USB_PHY_RX_CTRL */
#define PHASE_FREEZE_DLY_2_CL	(0x0 << 0)
#define PHASE_FREEZE_DLY_4_CL	BIT(0)
#define ACK_LENGTH_8_CL		(0x0 << 2)
#define ACK_LENGTH_12_CL	BIT(2)
#define ACK_LENGTH_16_CL	(0x2 << 2)
#define ACK_LENGTH_20_CL	(0x3 << 2)
#define SQ_LENGTH_3		(0x0 << 4)
#define SQ_LENGTH_6		BIT(4)
#define SQ_LENGTH_9		(0x2 << 4)
#define SQ_LENGTH_12		(0x3 << 4)
#define DISCON_THRESHOLD_260	(0x0 << 6)
#define DISCON_THRESHOLD_270	BIT(6)
#define DISCON_THRESHOLD_280	(0x2 << 6)
#define DISCON_THRESHOLD_290	(0x3 << 6)
#define SQ_THRESHOLD(x)		((x) << 8)
#define LPF_COEF(x)		((x) << 12)
#define INTPL_CUR_10		(0x0 << 14)
#define INTPL_CUR_20		BIT(14)
#define INTPL_CUR_30		(0x2 << 14)
#define INTPL_CUR_40		(0x3 << 14)

/* USB_PHY_ANALOG */
#define ANA_PWR_UP		BIT(1)
#define ANA_PWR_DOWN		BIT(2)
#define V2I_VCO_RATIO(x)	((x) << 7)
#define R_ROTATE_90		(0x0 << 10)
#define R_ROTATE_0		BIT(10)
#define MODE_TEST_EN		BIT(11)
#define ANA_TEST_DC_CTRL(x)	((x) << 12)

static const u32 phy_berlin_pll_dividers[] = {
	/* Berlin 2 */
	CLK_REF_DIV(0xc) | FEEDBACK_CLK_DIV(0x54),
	/* Berlin 2CD */
	CLK_REF_DIV(0x6) | FEEDBACK_CLK_DIV(0x55),
};

struct phy_berlin_usb_priv {
	void __iomem		*base;
	struct reset_control	*rst_ctrl;
	u32			pll_divider;
};

static int phy_berlin_usb_power_on(struct phy *phy)
{
	struct phy_berlin_usb_priv *priv = phy_get_drvdata(phy);

	reset_control_reset(priv->rst_ctrl);

	writel(priv->pll_divider,
	       priv->base + USB_PHY_PLL);
	writel(CLK_STABLE | PLL_CTRL_REG | PHASE_OFF_TOL_250 | KVC0_REG_CTRL |
	       CLK_BLK_EN, priv->base + USB_PHY_PLL_CONTROL);
	writel(V2I_VCO_RATIO(0x5) | R_ROTATE_0 | ANA_TEST_DC_CTRL(0x5),
	       priv->base + USB_PHY_ANALOG);
	writel(PHASE_FREEZE_DLY_4_CL | ACK_LENGTH_16_CL | SQ_LENGTH_12 |
	       DISCON_THRESHOLD_260 | SQ_THRESHOLD(0xa) | LPF_COEF(0x2) |
	       INTPL_CUR_30, priv->base + USB_PHY_RX_CTRL);

	writel(TX_VDD12_13 | TX_OUT_AMP(0x3), priv->base + USB_PHY_TX_CTRL1);
	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
	       priv->base + USB_PHY_TX_CTRL0);

	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4) |
	       EXT_FS_RCAL_DIV(0x2), priv->base + USB_PHY_TX_CTRL0);

	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
	       priv->base + USB_PHY_TX_CTRL0);
	writel(TX_CHAN_CTRL_REG(0xf) | DRV_SLEWRATE(0x3) | IMP_CAL_FS_HS_DLY_3 |
	       FS_DRV_EN_MASK(0xd), priv->base + USB_PHY_TX_CTRL2);

	return 0;
}

static struct phy_ops phy_berlin_usb_ops = {
	.power_on	= phy_berlin_usb_power_on,
	.owner		= THIS_MODULE,
};

static const struct of_device_id phy_berlin_sata_of_match[] = {
	{
		.compatible = "marvell,berlin2-usb-phy",
		.data = &phy_berlin_pll_dividers[0],
	},
	{
		.compatible = "marvell,berlin2cd-usb-phy",
		.data = &phy_berlin_pll_dividers[1],
	},
	{ },
};
MODULE_DEVICE_TABLE(of, phy_berlin_sata_of_match);

static int phy_berlin_usb_probe(struct platform_device *pdev)
{
	const struct of_device_id *match =
		of_match_device(phy_berlin_sata_of_match, &pdev->dev);
	struct phy_berlin_usb_priv *priv;
	struct resource *res;
	struct phy *phy;
	struct phy_provider *phy_provider;

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

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->base = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(priv->base))
		return PTR_ERR(priv->base);

	priv->rst_ctrl = devm_reset_control_get(&pdev->dev, NULL);
	if (IS_ERR(priv->rst_ctrl))
		return PTR_ERR(priv->rst_ctrl);

	priv->pll_divider = *((u32 *)match->data);

	phy = devm_phy_create(&pdev->dev, NULL, &phy_berlin_usb_ops);
	if (IS_ERR(phy)) {
		dev_err(&pdev->dev, "failed to create PHY\n");
		return PTR_ERR(phy);
	}

	platform_set_drvdata(pdev, priv);
	phy_set_drvdata(phy, priv);

	phy_provider =
		devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
	return PTR_ERR_OR_ZERO(phy_provider);
}

static struct platform_driver phy_berlin_usb_driver = {
	.probe	= phy_berlin_usb_probe,
	.driver	= {
		.name		= "phy-berlin-usb",
		.owner		= THIS_MODULE,
		.of_match_table	= phy_berlin_sata_of_match,
	 },
};
module_platform_driver(phy_berlin_usb_driver);

MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
MODULE_DESCRIPTION("Marvell Berlin PHY driver for USB");
MODULE_LICENSE("GPL");