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/*
* Copyright (c) 1994 Shantanu Goel
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*/
/*
* NEC 765/Intel 8272 floppy disk controller.
*/
/*
* Ports
*/
#define FD_DOR(p) (p) /* digital output register */
#define FD_STATUS(p) ((p) + 2) /* status register */
#define FD_DATA(p) ((p) + 3) /* data register */
#define FD_RATE(p) ((p) + 5) /* transfer rate register */
#define FD_DIR(p) ((p) + 5) /* digital input register */
/*
* Digital output register.
*/
#define DOR_IENABLE 0x08 /* enable interrupts and DMA */
#define DOR_RSTCLR 0x04 /* clear reset */
/*
* Status register.
*/
#define ST_RQM 0x80 /* request for master */
#define ST_DIO 0x40 /* direction of data transfer
1 = fdc to cpu, 0 = cpu to fdc */
#define ST_NDM 0x20 /* non DMA mode */
#define ST_CB 0x10 /* controller busy */
/*
* Digital input register.
*/
#define DIR_DSKCHG 0x80 /* diskette chnage has occured */
/*
* ST0
*/
#define ST0_IC 0xc0 /* interrupt code */
#define ST0_SE 0x20 /* seek end */
#define ST0_EC 0x10 /* equipment check */
#define ST0_NR 0x08 /* not ready */
#define ST0_HD 0x04 /* head address */
#define ST0_US 0x03 /* unit select */
/*
* ST1
*/
#define ST1_EC 0x80 /* end of cylinder */
#define ST1_DE 0x20 /* CRC data error */
#define ST1_OR 0x10 /* DMA overrun */
#define ST1_ND 0x04 /* sector not found */
#define ST1_NW 0x02 /* write-protected diskette */
#define ST1_MA 0x01 /* missing address mark */
/*
* ST2
*/
#define ST2_CM 0x40 /* control mark */
#define ST2_DD 0x20 /* data error */
#define ST2_WC 0x10 /* wrong cylinder */
#define ST2_SH 0x08 /* scan equal hit */
#define ST2_SN 0x04 /* scan not satisfied */
#define ST2_BC 0x02 /* bad cylinder */
#define ST2_MD 0x01 /* missing address mark */
/*
* ST3
*/
#define ST3_FT 0x80 /* fault */
#define ST3_WP 0x40 /* write protect */
#define ST3_RY 0x20 /* ready */
#define ST3_T0 0x10 /* track 0 */
#define ST3_TS 0x08 /* two side */
#define ST3_HD 0x04 /* head address */
#define ST3_US 0x03 /* unit select */
/*
* Commands.
*/
#define CMD_SPECIFY 0x03
#define CMD_RECAL 0x07
#define CMD_SENSEI 0x08
#define CMD_SEEK 0x0f
#define CMD_FORMAT 0x4d
#define CMD_WRITE 0xc5
#define CMD_READ 0xe6
/*
* Information required by FDC when formatting a diskette.
*/
struct format_info {
unsigned char cyl;
unsigned char head;
unsigned char sector;
unsigned char secsize;
};
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