// SPDX-License-Identifier: GPL-2.0+
/*
 * Davicom PHY drivers
 *
 * Copyright 2010-2011 Freescale Semiconductor, Inc.
 * author Andy Fleming
 */
#include <phy.h>

#define MIIM_DM9161_SCR                0x10
#define MIIM_DM9161_SCR_INIT   0x0610

/* DM9161 Specified Configuration and Status Register */
#define MIIM_DM9161_SCSR       0x11
#define MIIM_DM9161_SCSR_100F  0x8000
#define MIIM_DM9161_SCSR_100H  0x4000
#define MIIM_DM9161_SCSR_10F   0x2000
#define MIIM_DM9161_SCSR_10H   0x1000

/* DM9161 10BT Configuration/Status */
#define MIIM_DM9161_10BTCSR    0x12
#define MIIM_DM9161_10BTCSR_INIT       0x7800


/* Davicom DM9161E */
static int dm9161_config(struct phy_device *phydev)
{
	phy_write(phydev, MDIO_DEVAD_NONE, MII_BMCR, BMCR_ISOLATE);
	/* Do not bypass the scrambler/descrambler */
	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_DM9161_SCR,
			MIIM_DM9161_SCR_INIT);
	/* Clear 10BTCSR to default */
	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_DM9161_10BTCSR,
			MIIM_DM9161_10BTCSR_INIT);

	genphy_config_aneg(phydev);

	return 0;
}

static int dm9161_parse_status(struct phy_device *phydev)
{
	int mii_reg;

	mii_reg = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_DM9161_SCSR);

	if (mii_reg & (MIIM_DM9161_SCSR_100F | MIIM_DM9161_SCSR_100H))
		phydev->speed = SPEED_100;
	else
		phydev->speed = SPEED_10;

	if (mii_reg & (MIIM_DM9161_SCSR_100F | MIIM_DM9161_SCSR_10F))
		phydev->duplex = DUPLEX_FULL;
	else
		phydev->duplex = DUPLEX_HALF;

	return 0;
}

static int dm9161_startup(struct phy_device *phydev)
{
	int ret;

	ret = genphy_update_link(phydev);
	if (ret)
		return ret;

	return dm9161_parse_status(phydev);
}

static struct phy_driver DM9161_driver = {
	.name = "Davicom DM9161E",
	.uid = 0x181b880,
	.mask = 0xffffff0,
	.features = PHY_BASIC_FEATURES,
	.config = &dm9161_config,
	.startup = &dm9161_startup,
	.shutdown = &genphy_shutdown,
};

int phy_davicom_init(void)
{
	phy_register(&DM9161_driver);

	return 0;
}
