XI2C_SET_BITS
XI2C_SET_BITS(cmd, IC_DATA_CMD, STOP, 1);
XI2C_SET_BITS(reg, IC_CON, MASTER_MODE, 1);
XI2C_SET_BITS(reg, IC_CON, SLAVE_DISABLE, 1);
XI2C_SET_BITS(reg, IC_CON, RESTART_EN, 1);
XI2C_SET_BITS(reg, IC_CON, SPEED, XGBE_STD_SPEED);
XI2C_SET_BITS(reg, IC_CON, RX_FIFO_FULL_HOLD, 1);