50d99d1a52
Use it to reset controller and to select data rate. According to Intel 80277AA datasheet, software reset behaves the same as DOR reset except that it is self clearing. National Semiconductor PC8477B datasheet says the same. As a side effect, we no longer use Configuration Control Register (CCR) at 0x3f7 for these controllers, which is often missing in modern hardware.
150 lines
6.5 KiB
C
150 lines
6.5 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)nec765.h 7.1 (Berkeley) 5/9/91
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* $FreeBSD$
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*/
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/*
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* Nec 765 floppy disc controller definitions
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*/
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/* Main status register */
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#define NE7_DAB 0x01 /* Diskette drive A is seeking, thus busy */
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#define NE7_DBB 0x02 /* Diskette drive B is seeking, thus busy */
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#define NE7_CB 0x10 /* Diskette Controller Busy */
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#define NE7_NDM 0x20 /* Diskette Controller in Non Dma Mode */
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#define NE7_DIO 0x40 /* Diskette Controller Data register I/O */
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#define NE7_RQM 0x80 /* Diskette Controller ReQuest for Master */
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/* Status register ST0 */
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#define NE7_ST0BITS "\020\010invld\007abnrml\006seek_cmplt\005equ_chck\004drive_notrdy\003top_head"
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#define NE7_ST0_IC 0xc0 /* interrupt completion code */
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#define NE7_ST0_IC_RC 0xc0 /* terminated due to ready changed, n/a */
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#define NE7_ST0_IC_IV 0x80 /* invalid command; must reset FDC */
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#define NE7_ST0_IC_AT 0x40 /* abnormal termination, check error stat */
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#define NE7_ST0_IC_NT 0x00 /* normal termination */
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#define NE7_ST0_SE 0x20 /* seek end */
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#define NE7_ST0_EC 0x10 /* equipment check, recalibrated but no trk0 */
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#define NE7_ST0_NR 0x08 /* not ready (n/a) */
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#define NE7_ST0_HD 0x04 /* upper head selected */
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#define NE7_ST0_DR 0x03 /* drive code */
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/* Status register ST1 */
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#define NE7_ST1BITS "\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am"
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#define NE7_ST1_EN 0x80 /* end of cylinder, access past last record */
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#define NE7_ST1_DE 0x20 /* data error, CRC fail in ID or data */
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#define NE7_ST1_OR 0x10 /* DMA overrun, DMA failed to do i/o quickly */
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#define NE7_ST1_ND 0x04 /* no data, sector not found or CRC in ID f. */
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#define NE7_ST1_NW 0x02 /* not writeable, attempt to violate WP */
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#define NE7_ST1_MA 0x01 /* missing address mark (in ID or data field)*/
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/* Status register ST2 */
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#define NE7_ST2BITS "\020\007ctrl_mrk\006bad_crc\005wrong_cyl\004scn_eq\003scn_not_fnd\002bad_cyl\001no_dam"
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#define NE7_ST2_CM 0x40 /* control mark; found deleted data */
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#define NE7_ST2_DD 0x20 /* data error in data field, CRC fail */
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#define NE7_ST2_WC 0x10 /* wrong cylinder, ID field mismatches cmd */
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#define NE7_ST2_SH 0x08 /* scan equal hit */
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#define NE7_ST2_SN 0x04 /* scan not satisfied */
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#define NE7_ST2_BC 0x02 /* bad cylinder, cylinder marked 0xff */
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#define NE7_ST2_MD 0x01 /* missing address mark in data field */
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/* Status register ST3 */
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#define NE7_ST3BITS "\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002"
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#define NE7_ST3_FT 0x80 /* fault; PC: n/a */
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#define NE7_ST3_WP 0x40 /* write protected */
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#define NE7_ST3_RD 0x20 /* ready; PC: always true */
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#define NE7_ST3_T0 0x10 /* track 0 */
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#define NE7_ST3_TS 0x08 /* two-sided; PC: n/a */
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#define NE7_ST3_HD 0x04 /* upper head select */
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#define NE7_ST3_US 0x03 /* unit select */
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/* Data Rate Select Register DSR (enhanced controller) */
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#define I8207X_DSR_SR 0x80 /* software reset */
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#define I8207X_DSR_LP 0x40 /* low power */
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#define I8207X_DSR_PS 0x1c /* precompensation select */
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#define I8207X_DSR_RS 0x03 /* data rate select */
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/* Commands */
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/*
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* the top three bits -- where appropriate -- are set as follows:
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*
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* MT - multi-track; allow both sides to be handled in single cmd
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* MFM - modified frequency modulation; use MFM encoding
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* SK - skip; skip sectors marked as "deleted"
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*/
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#define NE7CMD_MT 0x80 /* READ, WRITE, WRITEDEL, READDEL, SCAN* */
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#define NE7CMD_MFM 0x40 /* same as MT, plus READTRK, READID, FORMAT */
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#define NE7CMD_SK 0x20 /* READ, READDEL, SCAN* */
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#define NE7CMD_READTRK 2 /* read whole track */
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#define NE7CMD_SPECIFY 3 /* specify drive parameters - requires unit
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* parameters byte */
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#define NE7CMD_SENSED 4 /* sense drive - requires unit select byte */
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#define NE7CMD_WRITE 5 /* write - requires eight additional bytes */
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#define NE7CMD_READ 6 /* read - requires eight additional bytes */
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#define NE7CMD_RECAL 7 /* recalibrate drive - requires
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* unit select byte */
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#define NE7CMD_SENSEI 8 /* sense controller interrupt status */
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#define NE7CMD_WRITEDEL 9 /* write deleted data */
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#define NE7CMD_READID 0xa /* read ID field */
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#define NE7CMD_READDEL 0xc /* read deleted data */
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#define NE7CMD_FORMAT 0xd /* format - requires five additional bytes */
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#define NE7CMD_SEEK 0xf /* seek drive - requires unit select byte
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* and new cyl byte */
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#define NE7CMD_SCNEQU 0x11 /* scan equal */
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#define NE7CMD_SCNLE 0x19 /* scan less or equal */
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#define NE7CMD_SCNGE 0x1d /* scan greater or equal */
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/*
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* Enhanced controller commands:
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*/
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#define NE7CMD_VERSION 0x10 /* version (ok for all controllers) */
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#define I8207X_CONFIGURE 0x13 /* configure enhanced features */
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/*
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* "specify" definitions
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*
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* acronyms (times are relative to a FDC clock of 8 MHz):
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* srt - step rate; PC usually 3 ms
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* hut - head unload time; PC usually maximum of 240 ms
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* hlt - head load time; PC usually minimum of 2 ms
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* nd - no DMA flag; PC usually not set (0)
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*/
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#define NE7_SPEC_1(srt, hut) (((16 - (srt)) << 4) | (((hut) / 16)))
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#define NE7_SPEC_2(hlt, nd) (((hlt) & 0xFE) | ((nd) & 1))
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