Annotation of sys/dev/ic/nec765reg.h, Revision 1.1.1.1
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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