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      1 /*	$NetBSD: nec765reg.h,v 1.7 2005/12/11 12:21:28 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  *	@(#)nec765.h	7.1 (Berkeley) 5/9/91
     32  */
     33 
     34 /*
     35  * Nec 765 floppy disc controller definitions
     36  */
     37 
     38 /* Main status register */
     39 #define NE7_DAB	0x01	/* Diskette drive A is seeking, thus busy */
     40 #define NE7_DBB	0x02	/* Diskette drive B is seeking, thus busy */
     41 #define NE7_CB	0x10	/* Diskette Controller Busy */
     42 #define NE7_NDM	0x20	/* Diskette Controller in Non DMA Mode */
     43 #define NE7_DIO	0x40	/* Diskette Controller Data register I/O */
     44 #define NE7_RQM	0x80	/* Diskette Controller ReQuest for Master */
     45 
     46 /* Status register ST0 */
     47 #define NE7_ST0BITS	"\020\010invld\007abnrml\006seek_cmplt\005drv_chck\004drive_rdy\003top_head"
     48 
     49 /* Status register ST1 */
     50 #define NE7_ST1BITS	"\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am"
     51 
     52 /* Status register ST2 */
     53 #define NE7_ST2BITS	"\020\007ctrl_mrk\006bad_crc\005wrong_cyl\004scn_eq\003scn_not_fnd\002bad_cyl\001no_dam"
     54 
     55 /* Status register ST3 */
     56 #define NE7_ST3BITS	"\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002"
     57 
     58 /* Commands */
     59 #define NE7CMD_SPECIFY	3	/*  specify drive parameters - requires unit
     60 					parameters byte */
     61 #define NE7CMD_SENSED	4	/*  sense drive - requires unit select byte */
     62 #define NE7CMD_WRITE	0xc5	/*  write - requires eight additional bytes */
     63 #define NE7CMD_READ	0xe6	/*  read - requires eight additional bytes */
     64 #define NE7CMD_FORMAT	0x4d	/*  format - requires five additional bytes */
     65 #define NE7CMD_RECAL	7	/*  recalibrate drive - requires
     66 					unit select byte */
     67 #define NE7CMD_SENSEI	8	/*  sense controller interrupt status */
     68 #define NE7CMD_SEEK	15	/*  seek drive - requires unit select byte
     69 					and new cyl byte */
     70