fdreg.h

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#ifndef _LINUX_FDREG_H
#define _LINUX_FDREG_H
/**
*

 * This file contains some defines for the floppy disk controller.
 * Various sources. Mostly "IBM Microcomputers: A Programmers
 * Handbook", Sanches and Canton.


*/

/// Fd controller regs. S&C, about page 340 
#define FD_STATUS       0x3f4
#define FD_DATA         0x3f5
#define FD_DOR          0x3f2           ///< Digital Output Register 
#define FD_DIR          0x3f7           ///< Digital Input Register (read) 
#define FD_DCR          0x3f7           ///< Diskette Control Register (write)

/// Bits of main status register 
#define STATUS_BUSYMASK 0x0F            ///< drive busy mask 
#define STATUS_BUSY     0x10            ///< FDC busy 
#define STATUS_DMA      0x20            ///< 0- DMA mode 
#define STATUS_DIR      0x40            ///< 0- cpu->fdc 
#define STATUS_READY    0x80            ///< Data reg ready 

/// Bits of FD_ST0 
#define ST0_DS          0x03            ///< drive select mask 
#define ST0_HA          0x04            ///< Head (Address) 
#define ST0_NR          0x08            ///< Not Ready 
#define ST0_ECE         0x10            ///< Equipment chech error 
#define ST0_SE          0x20            ///< Seek end 
#define ST0_INTR        0xC0            ///< Interrupt code mask 

/// Bits of FD_ST1 
#define ST1_MAM         0x01            ///< Missing Address Mark 
#define ST1_WP          0x02            ///< Write Protect 
#define ST1_ND          0x04            ///< No Data - unreadable 
#define ST1_OR          0x10            ///< OverRun 
#define ST1_CRC         0x20            ///< CRC error in data or addr 
#define ST1_EOC         0x80            ///< End Of Cylinder 

/// Bits of FD_ST2 
#define ST2_MAM         0x01            ///< Missing Addess Mark (again) 
#define ST2_BC          0x02            ///< Bad Cylinder 
#define ST2_SNS         0x04            ///< Scan Not Satisfied 
#define ST2_SEH         0x08            ///< Scan Equal Hit 
#define ST2_WC          0x10            ///< Wrong Cylinder 
#define ST2_CRC         0x20            ///< CRC error in data field 
#define ST2_CM          0x40            ///< Control Mark = deleted 

/// Bits of FD_ST3 
#define ST3_HA          0x04            ///< Head (Address) 
#define ST3_TZ          0x10            ///< Track Zero signal (1=track 0) 
#define ST3_WP          0x40            ///< Write Protect 

/// Values for FD_COMMAND 
#define FD_RECALIBRATE          0x07    ///< move to track 0 
#define FD_SEEK                 0x0F    ///< seek track 
#define FD_READ                 0xE6    ///< read with MT, MFM, SKip deleted 
#define FD_WRITE                0xC5    ///< write with MT, MFM 
#define FD_SENSEI               0x08    ///< Sense Interrupt Status 
#define FD_SPECIFY              0x03    ///< specify HUT etc 
#define FD_FORMAT               0x4D    ///< format one track 
#define FD_VERSION              0x10    ///< get version code 
#define FD_CONFIGURE            0x13    ///< configure FIFO operation 
#define FD_PERPENDICULAR        0x12    ///< perpendicular r/w mode 

/// DMA commands 
#define DMA_READ        0x46
#define DMA_WRITE       0x4A

/// FDC version return types 
#define FDC_TYPE_STD    0x80    ///< normal 8272A clone FDC 
#define FDC_TYPE_82077  0x90    ///< FIFO + perpendicular support 

#endif

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