sys/dev/disk/fd/nec765.h

   1 /*-
   2  * Copyright (c) 1991 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      from: @(#)nec765.h      7.1 (Berkeley) 5/9/91
  30  * $FreeBSD: src/sys/isa/ic/nec765.h,v 1.8 1999/08/28 00:46:04 peter Exp $
  31  * $DragonFly: src/sys/dev/disk/fd/nec765.h,v 1.2 2003/06/17 04:28:40 dillon Exp $
  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\005equ_chck\004drive_notrdy\003top_head"
  48
  49 #define NE7_ST0_IC      0xc0    /* interrupt completion code */
  50
  51 #define NE7_ST0_IC_RC   0xc0    /* terminated due to ready changed, n/a */
  52 #define NE7_ST0_IC_IV   0x80    /* invalid command; must reset FDC */
  53 #define NE7_ST0_IC_AT   0x40    /* abnormal termination, check error stat */
  54 #define NE7_ST0_IC_NT   0x00    /* normal termination */
  55
  56 #define NE7_ST0_SE      0x20    /* seek end */
  57 #define NE7_ST0_EC      0x10    /* equipment check, recalibrated but no trk0 */
  58 #define NE7_ST0_NR      0x08    /* not ready (n/a) */
  59 #define NE7_ST0_HD      0x04    /* upper head selected */
  60 #define NE7_ST0_DR      0x03    /* drive code */
  61
  62 /* Status register ST1 */
  63 #define NE7_ST1BITS     "\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am"
  64
  65 #define NE7_ST1_EN      0x80    /* end of cylinder, access past last record */
  66 #define NE7_ST1_DE      0x20    /* data error, CRC fail in ID or data */
  67 #define NE7_ST1_OR      0x10    /* DMA overrun, DMA failed to do i/o quickly */
  68 #define NE7_ST1_ND      0x04    /* no data, sector not found or CRC in ID f. */
  69 #define NE7_ST1_NW      0x02    /* not writeable, attempt to violate WP */
  70 #define NE7_ST1_MA      0x01    /* missing address mark (in ID or data field)*/
  71
  72 /* Status register ST2 */
  73 #define NE7_ST2BITS     "\020\007ctrl_mrk\006bad_crc\005wrong_cyl\004scn_eq\003scn_not_fnd\002bad_cyl\001no_dam"
  74
  75 #define NE7_ST2_CM      0x40    /* control mark; found deleted data */
  76 #define NE7_ST2_DD      0x20    /* data error in data field, CRC fail */
  77 #define NE7_ST2_WC      0x10    /* wrong cylinder, ID field mismatches cmd */
  78 #define NE7_ST2_SH      0x08    /* scan equal hit */
  79 #define NE7_ST2_SN      0x04    /* scan not satisfied */
  80 #define NE7_ST2_BC      0x02    /* bad cylinder, cylinder marked 0xff */
  81 #define NE7_ST2_MD      0x01    /* missing address mark in data field */
  82
  83 /* Status register ST3 */
  84 #define NE7_ST3BITS     "\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002"
  85
  86 #define NE7_ST3_FT      0x80    /* fault; PC: n/a */
  87 #define NE7_ST3_WP      0x40    /* write protected */
  88 #define NE7_ST3_RD      0x20    /* ready; PC: always true */
  89 #define NE7_ST3_T0      0x10    /* track 0 */
  90 #define NE7_ST3_TS      0x08    /* two-sided; PC: n/a */
  91 #define NE7_ST3_HD      0x04    /* upper head select */
  92 #define NE7_ST3_US      0x03    /* unit select */
  93
  94 /* Commands */
  95 /*
  96  * the top three bits -- where appropriate -- are set as follows:
  97  *
  98  * 0x80 - MT  multi-track; allow both sides to be handled in single cmd
  99  * 0x40 - MFM modified frequency modulation; use MFM encoding
 100  * 0x20 - SK  skip; skip sectors marked as "deleted"
 101  */
 102 #define NE7CMD_READTRK  0x42    /*  read whole track */
 103 #define NE7CMD_SPECIFY  3       /*  specify drive parameters - requires unit
 104                                         parameters byte */
 105 #define NE7CMD_SENSED   4       /*  sense drive - requires unit select byte */
 106 #define NE7CMD_WRITE    0xc5    /*  write - requires eight additional bytes */
 107 #define NE7CMD_READ     0xe6    /*  read - requires eight additional bytes */
 108 #define NE7CMD_RECAL    7       /*  recalibrate drive - requires
 109                                         unit select byte */
 110 #define NE7CMD_SENSEI   8       /*  sense controller interrupt status */
 111 #define NE7CMD_WRITEDEL 0xc9    /*  write deleted data */
 112 #define NE7CMD_READID   0x4a    /*  read ID field */
 113 #define NE7CMD_READDEL  0xec    /*  read deleted data */
 114 #define NE7CMD_FORMAT   0x4d    /*  format - requires five additional bytes */
 115 #define NE7CMD_SEEK     0x0f    /*  seek drive - requires unit select byte
 116                                         and new cyl byte */
 117 #define NE7CMD_SCNEQU   0xf1    /*  scan equal */
 118 #define NE7CMD_SCNLE    0xf9    /*  scan less or equal */
 119 #define NE7CMD_SCNGE    0xfd    /*  scan greater or equal */
 120
 121 /*
 122  * Enhanced controller commands:
 123  */
 124 #define NE7CMD_VERSION  0x10    /*  version (ok for all controllers) */
 125
 126 #define I8207X_CONFIGURE 0x13   /*  configure enhanced features */
 127
 128 /*
 129  * "specify" definitions
 130  *
 131  * acronyms (times are relative to a FDC clock of 8 MHz):
 132  * srt - step rate; PC usually 3 ms
 133  * hut - head unload time; PC usually maximum of 240 ms
 134  * hlt - head load time; PC usually minimum of 2 ms
 135  * nd  - no DMA flag; PC usually not set (0)
 136  */
 137
 138 #define NE7_SPEC_1(srt, hut) (((16 - (srt)) << 4) | (((hut) / 16)))
 139 #define NE7_SPEC_2(hlt, nd)  (((hlt) & 0xFE) | ((nd) & 1))