1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 32/* 33 * Nec 765 floppy disc controller definitions 34 */ 35 36/* Main status register */ 37#define NE7_DAB 0x01 /* Diskette drive A is seeking, thus busy */ 38#define NE7_DBB 0x02 /* Diskette drive B is seeking, thus busy */ 39#define NE7_CB 0x10 /* Diskette Controller Busy */ 40#define NE7_NDM 0x20 /* Diskette Controller in Non Dma Mode */ 41#define NE7_DIO 0x40 /* Diskette Controller Data register I/O */ 42#define NE7_RQM 0x80 /* Diskette Controller ReQuest for Master */ 43 44/* Status register ST0 */ 45#define NE7_ST0BITS "\020\010invld\007abnrml\006seek_cmplt\005equ_chck\004drive_notrdy\003top_head" 46 47#define NE7_ST0_IC 0xc0 /* interrupt completion code */ 48 49#define NE7_ST0_IC_RC 0xc0 /* terminated due to ready changed, n/a */ 50#define NE7_ST0_IC_IV 0x80 /* invalid command; must reset FDC */ 51#define NE7_ST0_IC_AT 0x40 /* abnormal termination, check error stat */ 52#define NE7_ST0_IC_NT 0x00 /* normal termination */ 53 54#define NE7_ST0_SE 0x20 /* seek end */ 55#define NE7_ST0_EC 0x10 /* equipment check, recalibrated but no trk0 */ 56#define NE7_ST0_NR 0x08 /* not ready (n/a) */ 57#define NE7_ST0_HD 0x04 /* upper head selected */ 58#define NE7_ST0_DR 0x03 /* drive code */ 59 60/* Status register ST1 */ 61#define NE7_ST1BITS "\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am" 62 63#define NE7_ST1_EN 0x80 /* end of cylinder, access past last record */ 64#define NE7_ST1_DE 0x20 /* data error, CRC fail in ID or data */ 65#define NE7_ST1_OR 0x10 /* DMA overrun, DMA failed to do i/o quickly */ 66#define NE7_ST1_ND 0x04 /* no data, sector not found or CRC in ID f. */ 67#define NE7_ST1_NW 0x02 /* not writeable, attempt to violate WP */ 68#define NE7_ST1_MA 0x01 /* missing address mark (in ID or data field)*/ 69 70/* Status register ST2 */ 71#define NE7_ST2BITS "\020\007ctrl_mrk\006bad_crc\005wrong_cyl\004scn_eq\003scn_not_fnd\002bad_cyl\001no_dam" 72 73#define NE7_ST2_CM 0x40 /* control mark; found deleted data */ 74#define NE7_ST2_DD 0x20 /* data error in data field, CRC fail */ 75#define NE7_ST2_WC 0x10 /* wrong cylinder, ID field mismatches cmd */ 76#define NE7_ST2_SH 0x08 /* scan equal hit */ 77#define NE7_ST2_SN 0x04 /* scan not satisfied */ 78#define NE7_ST2_BC 0x02 /* bad cylinder, cylinder marked 0xff */ 79#define NE7_ST2_MD 0x01 /* missing address mark in data field */ 80 81/* Status register ST3 */ 82#define NE7_ST3BITS "\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002" 83 84#define NE7_ST3_FT 0x80 /* fault; PC: n/a */ 85#define NE7_ST3_WP 0x40 /* write protected */ 86#define NE7_ST3_RD 0x20 /* ready; PC: always true */ 87#define NE7_ST3_T0 0x10 /* track 0 */ 88#define NE7_ST3_TS 0x08 /* two-sided; PC: n/a */ 89#define NE7_ST3_HD 0x04 /* upper head select */ 90#define NE7_ST3_US 0x03 /* unit select */ 91 92/* Data Rate Select Register DSR (enhanced controller) */ 93#define I8207X_DSR_SR 0x80 /* software reset */ 94#define I8207X_DSR_LP 0x40 /* low power */ 95#define I8207X_DSR_PS 0x1c /* precompensation select */ 96#define I8207X_DSR_RS 0x03 /* data rate select */ 97 98/* Commands */ 99/* 100 * the top three bits -- where appropriate -- are set as follows: 101 * 102 * MT - multi-track; allow both sides to be handled in single cmd 103 * MFM - modified frequency modulation; use MFM encoding 104 * SK - skip; skip sectors marked as "deleted" 105 */ 106 107#define NE7CMD_MT 0x80 /* READ, WRITE, WRITEDEL, READDEL, SCAN* */ 108#define NE7CMD_MFM 0x40 /* same as MT, plus READTRK, READID, FORMAT */ 109#define NE7CMD_SK 0x20 /* READ, READDEL, SCAN* */ 110 111#define NE7CMD_READTRK 0x02 /* read whole track */ 112#define NE7CMD_SPECIFY 0x03 /* specify drive parameters - requires unit 113 * parameters byte */ 114#define NE7CMD_SENSED 0x04 /* sense drive - requires unit select byte */ 115#define NE7CMD_WRITE 0x05 /* write - requires eight additional bytes */ 116#define NE7CMD_READ 0x06 /* read - requires eight additional bytes */ 117#define NE7CMD_RECAL 0x07 /* recalibrate drive - requires 118 * unit select byte */ 119#define NE7CMD_SENSEI 0x08 /* sense controller interrupt status */ 120#define NE7CMD_WRITEDEL 0x09 /* write deleted data */ 121#define NE7CMD_READID 0x0a /* read ID field */ 122#define NE7CMD_READDEL 0x0c /* read deleted data */ 123#define NE7CMD_FORMAT 0x0d /* format - requires five additional bytes */ 124#define NE7CMD_SEEK 0x0f /* seek drive - requires unit select byte 125 * and new cyl byte */ 126#define NE7CMD_VERSION 0x10 /* get version */ 127#define NE7CMD_SCNEQU 0x11 /* scan equal */ 128#define NE7CMD_SCNLE 0x19 /* scan less or equal */ 129#define NE7CMD_SCNGE 0x1d /* scan greater or equal */ 130 131/* 132 * Enhanced controller commands: 133 */ 134#define I8207X_DUMPREG 0x0e /* dump internal registers */ 135#define I8207X_CONFIG 0x13 /* configure enhanced features */ 136 137/* 138 * "specify" definitions 139 * 140 * acronyms (times are relative to a FDC clock of 8 MHz): 141 * srt - step rate; PC usually 3 ms 142 * hut - head unload time; PC usually maximum of 240 ms 143 * hlt - head load time; PC usually minimum of 2 ms 144 * nd - no DMA flag; PC usually not set (0) 145 */ 146 147#define NE7_SPEC_1(srt, hut) (((16 - (srt)) << 4) | (((hut) / 16))) 148#define NE7_SPEC_2(hlt, nd) (((hlt) & 0xFE) | ((nd) & 1)) 149