XGMAC_MDIO_C22P
tmp = readl(priv->ioaddr + XGMAC_MDIO_C22P);
writel(tmp, priv->ioaddr + XGMAC_MDIO_C22P);
tmp = readl(priv->ioaddr + XGMAC_MDIO_C22P);
writel(tmp, priv->ioaddr + XGMAC_MDIO_C22P);