TX_FIFO_INF
return (smsc911x_reg_read(pdata, TX_FIFO_INF)
freespace = smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TDFREE_;
smsc911x_reg_read(pdata, TX_FIFO_INF) & TX_FIFO_INF_TSUSED_;