PHY_28NM_TX_REG0
reg = readl(base + PHY_28NM_TX_REG0) & ~PHY_28NM_TX_AMP_MASK;
base + PHY_28NM_TX_REG0);
val = readw(base + PHY_28NM_TX_REG0);
writew(val, base + PHY_28NM_TX_REG0);