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      1 /*	$NetBSD: crx.h,v 1.4 2005/12/11 12:19:36 christos Exp $	*/
      2 /*
      3  * Copyright (c) 1988 Regents of the University of California.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to Berkeley by
      7  * Chris Torek.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	@(#)rx50reg.h	7.2 (Berkeley) 6/28/90
     34  */
     35 
     36 /*
     37  * RX50 registers.
     38  */
     39 
     40 /*
     41  * The names below do not quite match the DEC documentation simply because
     42  * the names in the documentation are so bad.
     43  */
     44 struct rx50device {
     45 	u_short	rxid;		/* identification */
     46 	u_short	reserved;
     47 	u_short	rxcmd;		/* command function reg */
     48 	u_short	rxtrk;		/* track */
     49 	u_short	rxsec;		/* sector */
     50 	u_short	rxcsc;		/* current sector */
     51 	u_short	rxict;		/* incorrect track (???) */
     52 	u_short	rxext;		/* extend command register */
     53 	u_short	rxedb;		/* empty data buffer (read) */
     54 	u_short	rxrda;		/* reset data address */
     55 	volatile u_short	rxgo;	/* read to start current cmd */
     56 	u_short	rxfdb;		/* fill data buffer (write) */
     57 };
     58 
     59 #define	RX50SEC		10	/* sectors per track */
     60 #define	RX50MAXSEC	800	/* 10 sectors times 80 tracks */
     61 
     62 /* Interrupt vector */
     63 #define	SCB_RX50	0xf0
     64 
     65 /*
     66  * Do the sector skew given the sector and track
     67  * number (it depends on both!).
     68  */
     69 /*			(((((s) / 5) + 2 * ((s) + (t))) % 10) + 1) */
     70 #define	RX50SKEW(s, t)	(((s) / 5) + "\1\3\5\7\11\1\3\5\7"[((s) + (t)) % 5])
     71 
     72 /*
     73  * Values in the command function register.
     74  */
     75 #define	RXCMD_ERROR	0x80	/* error bit (composite?) */
     76 #define	RXCMD_READ	0x40	/* read command */
     77 #define	RXCMD_WRITE	0x70	/* write command */
     78 #define	RXCMD_RESET	0x20	/* reset command */
     79 #define	RXCMD_DONE	0x08	/* operation done (status) */
     80 #define	RXCMD_DRIVE0	0x00	/* select drive 0 (csa1) */
     81 #define	RXCMD_DRIVE1	0x02	/* select drive 1 (csa2) */
     82