MAC_RFCR
XGMAC_IOWRITE_BITS(pdata, MAC_RFCR, RFE, 0);
XGMAC_IOWRITE_BITS(pdata, MAC_RFCR, RFE, 1);
XGMAC_IOWRITE_BITS(pdata, MAC_RFCR, PFCE,
regval = readl(pdata->mac_regs + MAC_RFCR);
writel(regval, pdata->mac_regs + MAC_RFCR);
regval = readl(pdata->mac_regs + MAC_RFCR);
writel(regval, pdata->mac_regs + MAC_RFCR);