88e1512和88e1510是一個系列的phy，采用marvell的通用phy驅(qū)動，驅(qū)動源碼路徑：\u-boot\drivers\net\phy\marvell.c

如上圖所示，ETH2的工作模式為RGMII TO SGMII，SGMII與交換芯片bcm5396相連。設備樹配置為RGMII模式，如下：

&gem0 {
	status = "okay";
	phy-mode = "rgmii-id";
	phy-handle = <&ethernet_phy0>;

	ethernet_phy0: ethernet-phy@0 {
		reg = <0>;
		device_type = "ethernet-phy";
	};
};

查看芯片手冊Page 18 – Register 20，配置工作模式為RGMII (System mode) to SGMII (Media mode)。

?? 讀寫88e1512寄存器，先將要操作的Page number寫入Register 22,再配置相應的寄存器。

?? 88e1512驅(qū)動配置步驟：文章來源地址http://www.zghlxwxcb.cn/news/detail-460436.html

• 配置工作模式為100，RGMII (System mode) to SGMII (Media mode)。
• 所有寄存器配置完成后，將Page Address配置為1，PHY切換至Fiber Page，否則MAC獲取的是PHY的Copper Page的link狀態(tài)，無法獲取到Fiber Page的link狀態(tài)。
• 關閉自協(xié)商，強制link為千兆全雙工

  static int m88e1518_config(struct phy_device *phydev)
  {
  	u16 reg;
  	int temp_addr;
  
  	/*
  	 * As per Marvell Release Notes - Alaska 88E1510/88E1518/88E1512
  	 * /88E1514 Rev A0, Errata Section 3.1
  	 */
  
  	/* EEE initialization */
  	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_88E1118_PHY_PAGE, 0x00ff);
  	phy_write(phydev, MDIO_DEVAD_NONE, 17, 0x214B);
  	phy_write(phydev, MDIO_DEVAD_NONE, 16, 0x2144);
  	phy_write(phydev, MDIO_DEVAD_NONE, 17, 0x0C28);
  	phy_write(phydev, MDIO_DEVAD_NONE, 16, 0x2146);
  	phy_write(phydev, MDIO_DEVAD_NONE, 17, 0xB233);
  	phy_write(phydev, MDIO_DEVAD_NONE, 16, 0x214D);
  	phy_write(phydev, MDIO_DEVAD_NONE, 17, 0xCC0C);
  	phy_write(phydev, MDIO_DEVAD_NONE, 16, 0x2159);
  	phy_write(phydev, MDIO_DEVAD_NONE, MIIM_88E1118_PHY_PAGE, 0x0000);
  
  	/* SGMII-to-Copper mode initialization */
  	if (phydev->interface == PHY_INTERFACE_MODE_SGMII ||
  		phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
  		/* Select page 18 */
  		phy_write(phydev, MDIO_DEVAD_NONE, MIIM_88E1118_PHY_PAGE, 18);
  		
  		/* In reg 20, write MODE[2:0] = 0x1 (SGMII to Copper) */
  		if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
  			m88e1518_phy_writebits(phydev, MIIM_88E151x_GENERAL_CTRL,
  				       0, 3, MIIM_88E151x_MODE_SGMII);
  		} 
  else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID) {
  		/* In reg 20, write MODE[2:0] = 0x4 (RGMII to SGMII) */
  			m88e1518_phy_writebits(phydev, MIIM_88E151x_GENERAL_CTRL,
  				       0, 3, MII_88E151x_MODE_RGMII_TO_SGMII);
  		}
  
  		/* PHY reset is necessary after changing MODE[2:0] */
  		m88e1518_phy_writebits(phydev, MIIM_88E151x_GENERAL_CTRL,
  				       MIIM_88E151x_RESET_OFFS, 1, 1);
  
  		/* Reset page selection */
  		phy_write(phydev, MDIO_DEVAD_NONE, MIIM_88E1118_PHY_PAGE, 0);
  
  		udelay(100);
  	}
  
  	if (phydev->interface == PHY_INTERFACE_MODE_SGMII) {
  		reg = phy_read(phydev, MDIO_DEVAD_NONE,
  			       MIIM_88E1111_PHY_EXT_SR);
  
  		reg &= ~(MIIM_88E1111_HWCFG_MODE_MASK);
  		reg |= MIIM_88E1111_HWCFG_MODE_SGMII_NO_CLK;
  		reg |= MIIM_88E1111_HWCFG_FIBER_COPPER_AUTO;
  
  		phy_write(phydev, MDIO_DEVAD_NONE,
  			  MIIM_88E1111_PHY_EXT_SR, reg);
  	}
  
  	if (phy_interface_is_rgmii(phydev)) {
  		phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE, 2);
  
  		reg = phy_read(phydev, MDIO_DEVAD_NONE, MIIM_88E151x_PHY_MSCR);
  		reg &= ~MIIM_88E151x_RGMII_RXTX_DELAY;
  		if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
  			reg |= MIIM_88E151x_RGMII_RXTX_DELAY;
  		else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
  			reg |= MIIM_88E151x_RGMII_RX_DELAY;
  		else if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
  			reg |= MIIM_88E151x_RGMII_TX_DELAY;
  		phy_write(phydev, MDIO_DEVAD_NONE, MIIM_88E151x_PHY_MSCR, reg);
  
  		phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE, 0);
  	}
  
  		phy_write(phydev, MDIO_DEVAD_NONE, MII_MARVELL_PHY_PAGE, MII_MARVELL_FIBER_PAGE);
  		
  		phydev->autoneg = AUTONEG_DISABLE;
  		phydev->speed = SPEED_1000;
  		phydev->duplex = DUPLEX_FULL;
  
  		puts("phy_interface_is_rgmii out!!!!!!!!\n");
  
  	/* soft reset */
  	phy_reset(phydev);
  
  	genphy_config_aneg(phydev);
  	//genphy_restart_aneg(phydev);
  
  	return 0;
  }

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