REG_ADDR4
rtl818x_iowrite32(priv, REG_ADDR4(0x1F0), 0);
rtl818x_ioread32(priv, REG_ADDR4(0x1F0));
rtl818x_iowrite32(priv, REG_ADDR4(0x1F4), 0);
rtl818x_ioread32(priv, REG_ADDR4(0x1F4));
#define SW_3W_DB0_4 REG_ADDR4(0x274)
#define SW_3W_DB1_4 REG_ADDR4(0x278)