/*      $NetBSD: fdreg.h,v 1.6 2012/10/14 18:38:32 tsutsui Exp $        */

/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)fdreg.h     7.1 (Berkeley) 5/9/91
*/

/*
* x680x0 floppy controller registers and bitfields
*/

/* uses NEC72065 controller */
#include <dev/ic/nec765reg.h>

/* registers */
#define fdsts   0       /* NEC 765 Main Status Register (R) */
#define fddata  1       /* NEC 765 Data Register (R/W) */
#define fdout   2       /* Digital Output Register (W) */
#define fdctl   3       /* Control Register (W) */
#define FDC_500KBPS     0x00    /* 500KBPS MFM drive transfer rate */
#define FDC_300KBPS     0x01    /* 300KBPS MFM drive transfer rate */
#define FDC_250KBPS     0x02    /* 250KBPS MFM drive transfer rate */
#define FDC_125KBPS     0x03    /* 125KBPS FM drive transfer rate */

#define FDC_BSIZE       512
#define FDC_MAXIOSIZE   MAXBSIZE

/* Floppy disk controller command bytes. */
#define NE7CMD_RESET       0x36 /* reset command for fdc */

/* default attach args */
#define FDC_ADDR 0xe94000       /* builtin fdc is here */
#define FDC_MAPSIZE 0x2000      /* builtin fdc I/O range */
#define FDC_INTR 96             /* interrupt vector */
#define FDC_DMA 0               /* DMA ch# */
#define FDC_DMAINTR 100         /* DMA interrupt vector */

/*
* fdformat parameters
*/

#define FD_MAX_NSEC     18      /* highest known number of spt */

struct ne7_fd_formb {
       int cyl, head;
       int transfer_rate;      /* fdreg.h: FDC_???KBPS */

       union {
               struct fd_form_data {
                       /*
                        * DO NOT CHANGE THE LAYOUT OF THIS STRUCTS
                        * it is hardware-dependent since it exactly
                        * matches the byte sequence to write to FDC
                        * during its `format track' operation
                        */
                       uint8_t secshift; /* 0 -> 128, ...; usually 2 -> 512 */
                       uint8_t nsecs;    /* must be <= FD_MAX_NSEC */
                       uint8_t gaplen;   /* GAP 3 length; usually 84 */
                       uint8_t fillbyte; /* usually 0xf6 */
                       struct fd_idfield_data {
                               /*
                                * data to write into id fields;
                                * for obscure formats, they mustn't match
                                * the real values (but mostly do)
                                */
                               uint8_t cylno;          /* 0 thru 79 (or 39) */
                               uint8_t headno;         /* 0, or 1 */
                               uint8_t secno;          /* starting at 1! */
                               uint8_t secsize;        /* usually 2 */
                       } idfields[FD_MAX_NSEC]; /* 0 <= idx < nsecs used */
               } structured;
               uint8_t raw[1]; /* to have continuous indexed access */
       } format_info;
};

/* make life easier */
# define fd_formb_secshift   format_info.structured.secshift
# define fd_formb_nsecs      format_info.structured.nsecs
# define fd_formb_gaplen     format_info.structured.gaplen
# define fd_formb_fillbyte   format_info.structured.fillbyte
/* these data must be filled in for(i = 0; i < fd_formb_nsecs; i++) */
# define fd_formb_cylno(i)   format_info.structured.idfields[i].cylno
# define fd_formb_headno(i)  format_info.structured.idfields[i].headno
# define fd_formb_secno(i)   format_info.structured.idfields[i].secno
# define fd_formb_secsize(i) format_info.structured.idfields[i].secsize