#ifndef LX86_LINUXMT_FDREG_H
#define LX86_LINUXMT_FDREG_H

/* This file contains some defines for the floppy disk controller. Various
 * sources. Mostly "IBM Microcomputers: A Programmers Handbook" by 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
