serial.h 566 B

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  1. /* Line Status Register bits */
  2. #define LSR_DR 0x01 /* Data ready */
  3. #define LSR_OE 0x02 /* Overrun */
  4. #define LSR_PE 0x04 /* Parity error */
  5. #define LSR_FE 0x08 /* Framing error */
  6. #define LSR_BI 0x10 /* Break */
  7. #define LSR_THRE 0x20 /* Xmit holding register empty */
  8. #define LSR_TEMT 0x40 /* Xmitter empty */
  9. #define LSR_ERR 0x80 /* Error */
  10. #define CLKRATE 3686400 /* cogent motherboard serial clk = 3.6864MHz */
  11. #define DEFDIV 1 /* default to 230400 bps */
  12. #define br_to_div(br) (CLKRATE / (16 * (br)))
  13. #define div_to_br(div) (CLKRATE / (16 * (div)))