u-boot/arch/arm/mach-davinci/lxt972.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Intel LXT971/LXT972 PHY Driver for TI DaVinci
 * (TMS320DM644x) based boards.
 *
 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
 *
 * --------------------------------------------------------
 */

#include <common.h>
#include <net.h>
#include <miiphy.h>
#include <lxt971a.h>
#include <asm/arch/emac_defs.h>
#include "../../../drivers/net/davinci_emac.h"

#ifdef CONFIG_DRIVER_TI_EMAC

#ifdef CONFIG_CMD_NET

int lxt972_is_phy_connected(int phy_addr)
{
	u_int16_t id1, id2;

	if (!davinci_eth_phy_read(phy_addr, MII_PHYSID1, &id1))
		return(0);
	if (!davinci_eth_phy_read(phy_addr, MII_PHYSID2, &id2))
		return(0);

	if ((id1 == (0x0013)) && ((id2  & 0xfff0) == 0x78e0))
		return(1);

	return(0);
}

int lxt972_get_link_speed(int phy_addr)
{
	u_int16_t stat1, tmp;
	volatile emac_regs *emac = (emac_regs *)EMAC_BASE_ADDR;

	if (!davinci_eth_phy_read(phy_addr, PHY_LXT971_STAT2, &stat1))
		return(0);

	if (!(stat1 & PHY_LXT971_STAT2_LINK))	/* link up? */
		return(0);

	if (!davinci_eth_phy_read(phy_addr, PHY_LXT971_DIG_CFG, &tmp))
		return(0);

	tmp |= PHY_LXT971_DIG_CFG_MII_DRIVE;

	davinci_eth_phy_write(phy_addr, PHY_LXT971_DIG_CFG, tmp);
	/* Read back */
	if (!davinci_eth_phy_read(phy_addr, PHY_LXT971_DIG_CFG, &tmp))
		return(0);

	/* Speed doesn't matter, there is no setting for it in EMAC... */
	if (stat1 & PHY_LXT971_STAT2_DUPLEX_MODE) {
		/* set DM644x EMAC for Full Duplex  */
		emac->MACCONTROL = EMAC_MACCONTROL_MIIEN_ENABLE |
			EMAC_MACCONTROL_FULLDUPLEX_ENABLE;
	} else {
		/*set DM644x EMAC for Half Duplex  */
		emac->MACCONTROL = EMAC_MACCONTROL_MIIEN_ENABLE;
	}

	return(1);
}


int lxt972_init_phy(int phy_addr)
{
	int ret = 1;

	if (!lxt972_get_link_speed(phy_addr)) {
		/* Try another time */
		ret = lxt972_get_link_speed(phy_addr);
	}

	/* Disable PHY Interrupts */
	davinci_eth_phy_write(phy_addr, PHY_LXT971_INT_ENABLE, 0);

	return(ret);
}


int lxt972_auto_negotiate(int phy_addr)
{
	u_int16_t tmp;

	if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
		return(0);

	/* Restart Auto_negotiation  */
	tmp |= BMCR_ANRESTART;
	davinci_eth_phy_write(phy_addr, MII_BMCR, tmp);

	/*check AutoNegotiate complete */
	udelay (10000);
	if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
		return(0);

	if (!(tmp & BMSR_ANEGCOMPLETE))
		return(0);

	return (lxt972_get_link_speed(phy_addr));
}

#endif	/* CONFIG_CMD_NET */

#endif	/* CONFIG_DRIVER_ETHER */