- u8 txrx; /* WR RHR/THR - Holding Reg */
- u8 ier; /* WR IER - Interrupt Enable Reg */
- u8 isr_fcr; /* WR ISR/FCR - Interrupt Status Reg/Fifo Control Reg */
- u8 lcr; /* WR LCR - Line Control Reg */
- u8 mcr; /* WR MCR - Modem Control Reg */
- u8 lsr; /* WR LSR - Line Status Reg */
- u8 msr; /* WR MSR - Modem Status Reg */
- u8 spr; /* WR SPR - Scratch Pad Reg */