1 /* 2 * AT floppy controller registers and bitfields 3 * @(#)fdreg.h 1.1 (Berkeley) 11/08/90 4 */ 5 6 /* uses NEC765 controller */ 7 #include "../i386/isa/ic/nec765.h" 8 9 /* registers */ 10 #define fdout 2 /* Digital Output Register (W) */ 11 #define FDO_FDSEL 0x01 /* floppy device select */ 12 #define FDO_FRST 0x04 /* floppy controller reset */ 13 #define FDO_FDMAEN 0x08 /* enable floppy DMA and Interrupt */ 14 #define FDO_MOEN0 0x10 /* motor enable drive 0 */ 15 #define FDO_MOEN1 0x20 /* motor enable drive 1 */ 16 17 #define fdsts 4 /* NEC 765 Main Status Register (R) */ 18 #define fddata 5 /* NEC 765 Data Register (R/W) */ 19 20 #define fdctl 7 /* Control Register (W) */ 21 #define FDC_500KBPS 0x00 /* 500KBPS MFM drive transfer rate */ 22 #define FDC_300KBPS 0x01 /* 300KBPS MFM drive transfer rate */ 23 #define FDC_250KBPS 0x02 /* 250KBPS MFM drive transfer rate */ 24 #define FDC_125KBPS 0x03 /* 125KBPS FM drive transfer rate */ 25 26 #define fdin 7 /* Digital Input Register (R) */ 27 #define FDI_DCHG 0x80 /* diskette has been changed */ 28 29 30