Annotation of sys/dev/ic/nec765reg.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: nec765reg.h,v 1.4 2003/06/02 23:28:02 millert Exp $ */
! 2: /*-
! 3: * Copyright (c) 1991 The Regents of the University of California.
! 4: * All rights reserved.
! 5: *
! 6: * Redistribution and use in source and binary forms, with or without
! 7: * modification, are permitted provided that the following conditions
! 8: * are met:
! 9: * 1. Redistributions of source code must retain the above copyright
! 10: * notice, this list of conditions and the following disclaimer.
! 11: * 2. Redistributions in binary form must reproduce the above copyright
! 12: * notice, this list of conditions and the following disclaimer in the
! 13: * documentation and/or other materials provided with the distribution.
! 14: * 3. Neither the name of the University nor the names of its contributors
! 15: * may be used to endorse or promote products derived from this software
! 16: * without specific prior written permission.
! 17: *
! 18: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 19: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 20: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 21: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 22: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 23: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 24: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 25: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 26: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 27: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 28: * SUCH DAMAGE.
! 29: *
! 30: * from: @(#)nec765.h 7.1 (Berkeley) 5/9/91
! 31: * $FreeBSD: nec765.h,v 1.4 1995/01/06 15:20:00 joerg 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:
! 127: /*
! 128: * "specify" definitions
! 129: *
! 130: * acronyms (times are relative to a FDC clock of 8 MHz):
! 131: * srt - step rate; PC usually 3 ms
! 132: * hut - head unload time; PC usually maximum of 240 ms
! 133: * hlt - head load time; PC usually minimum of 2 ms
! 134: * nd - no DMA flag; PC usually not set (0)
! 135: */
! 136:
! 137: #define NE7_SPEC_1(srt, hut) (((16 - (srt)) << 4) | (((hut) / 16)))
! 138: #define NE7_SPEC_2(hlt, nd) (((hlt) & 0xFE) | ((nd) & 1))
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