serdes.c

/*
 * Marvell 88E6xxx SERDES manipulation, via SMI bus
 *
 * Copyright (c) 2008 Marvell Semiconductor
 *
 * Copyright (c) 2017 Andrew Lunn <andrew@lunn.ch>
 *
 * 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/mii.h>

#include "mv88e6xxx.h"
#include "phy.h"
#include "port.h"
#include "serdes.h"

static int mv88e6352_serdes_read(struct mv88e6xxx_chip *chip, int reg,
				 u16 *val)
{
	return mv88e6xxx_phy_page_read(chip, MV88E6352_ADDR_SERDES,
				       MV88E6352_SERDES_PAGE_FIBER,
				       reg, val);
}

static int mv88e6352_serdes_write(struct mv88e6xxx_chip *chip, int reg,
				  u16 val)
{
	return mv88e6xxx_phy_page_write(chip, MV88E6352_ADDR_SERDES,
					MV88E6352_SERDES_PAGE_FIBER,
					reg, val);
}

static int mv88e6352_serdes_power_set(struct mv88e6xxx_chip *chip, bool on)
{
	u16 val, new_val;
	int err;

	err = mv88e6352_serdes_read(chip, MII_BMCR, &val);
	if (err)
		return err;

	if (on)
		new_val = val & ~BMCR_PDOWN;
	else
		new_val = val | BMCR_PDOWN;

	if (val != new_val)
		err = mv88e6352_serdes_write(chip, MII_BMCR, new_val);

	return err;
}

int mv88e6352_serdes_power(struct mv88e6xxx_chip *chip, int port, bool on)
{
	int err;
	u8 cmode;

	err = mv88e6xxx_port_get_cmode(chip, port, &cmode);
	if (err)
		return err;

	if ((cmode == PORT_STATUS_CMODE_100BASE_X) ||
	    (cmode == PORT_STATUS_CMODE_1000BASE_X) ||
	    (cmode == PORT_STATUS_CMODE_SGMII)) {
		err = mv88e6352_serdes_power_set(chip, on);
		if (err < 0)
			return err;
	}

	return 0;
}