text: // 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 */
  