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floppy.h

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/*!     \file include/kernel/floppy.h
 *      \brief Floppy disk driver header.
 *      \author Andrea Righi <drizzt@inwind.it>
 *      \date Last update: 2003-11-08
 *      \note Copyright (&copy;) 2003 Andrea Righi
 */

#ifndef FLOPPY_H
#define FLOPPY_H

// --- Drive geometry for 1.44MB floppies ----------------------------- //

#define FDC_SECTORS     18      //!< Sectors per track.
#define FDC_HEADS       2       //!< Heads per track.
#define FDC_TRACKS      80      //!< Tracks per disk.
#define FDC_SECTOR_SIZE 512     //!< Bytes per sector.

//! FDC motor spin-up time (msec).
#define FDC_TIME_MOTOR_SPINUP   500

//! FDC timeout to turn the motor off (msec).
#define FDC_TIME_MOTOR_OFF      3000

// --- Floppy I/O ports ----------------------------------------------- //

#define FDC_DOR         0x3F2 //!< Digital Output Register.
#define FDC_MSR         0x3F4 //!< Main Status Register (read).
#define FDC_DSR         0x3F4 //!< Data Rate Select Register (write).
#define FDC_DATA        0x3F5 //!< Data Register.
#define FDC_DIR         0x3F7 //!< Digital Input Register.
#define FDC_CCR         0x3F7 //!< Configuration Control Register.

// --- Floppy Commands ------------------------------------------------ //

#define CMD_SPECIFY     0x03    //!< Specify.
#define CMD_WRITE       0xC5    //!< Write.
#define CMD_READ        0xE6    //!< Read.
#define CMD_RECAL       0x07    //!< Recalibrate.
#define CMD_SENSEI      0x08    //!< Send a "sense interrupt status".
#define CMD_FORMAT      0x4D    //!< Format a track.
#define CMD_SEEK        0x0F    //!< Seek a track.
#define CMD_VERSION     0x10    //!< Get the controller version.

// --- Register values ------------------------------------------------ //

//! The controller is busy.
#define MSR_BUSY        0x10

//! Floppy geometry structures.
typedef struct floppy_struct
{
        dword   size,   //!< # of sectors total.
                spt,    //!< sectors per track.
                heads,  //!< # of heads.
                tracks; //!< # of tracks.
        byte    fmtgap, //!< gap3 while formatting.
                rwgap,  //!< gap3 while reading/writing.
                rate;   //!< data rate.
        char    *name;  //!< format name.
} floppy_struct;

// --- Prototypes ----------------------------------------------------- //

void floppy_handler();
void floppy_thread();
bool init_floppy();
void fdc_motor_on();
void fdc_motor_off();
void fdc_recalibrate();
bool fdc_seek(int track);
bool fdc_read(int block, byte *buffer, uint32_t count);
bool fdc_write(int block, byte *buffer, uint32_t count);
bool fdc_is_changed();

#endif

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