2 * Copyright (c) 1991 The Regents of the University of California.
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33 * from: @(#)nec765.h 7.1 (Berkeley) 5/9/91
38 * Nec 765 floppy disc controller definitions
41 /* Main status register */
42 #define NE7_DAB 0x01 /* Diskette drive A is seeking, thus busy */
43 #define NE7_DBB 0x02 /* Diskette drive B is seeking, thus busy */
44 #define NE7_CB 0x10 /* Diskette Controller Busy */
45 #define NE7_NDM 0x20 /* Diskette Controller in Non Dma Mode */
46 #define NE7_DIO 0x40 /* Diskette Controller Data register I/O */
47 #define NE7_RQM 0x80 /* Diskette Controller ReQuest for Master */
49 /* Status register ST0 */
50 #define NE7_ST0BITS "\020\010invld\007abnrml\006seek_cmplt\005equ_chck\004drive_notrdy\003top_head"
52 #define NE7_ST0_IC 0xc0 /* interrupt completion code */
54 #define NE7_ST0_IC_RC 0xc0 /* terminated due to ready changed, n/a */
55 #define NE7_ST0_IC_IV 0x80 /* invalid command; must reset FDC */
56 #define NE7_ST0_IC_AT 0x40 /* abnormal termination, check error stat */
57 #define NE7_ST0_IC_NT 0x00 /* normal termination */
59 #define NE7_ST0_SE 0x20 /* seek end */
60 #define NE7_ST0_EC 0x10 /* equipment check, recalibrated but no trk0 */
61 #define NE7_ST0_NR 0x08 /* not ready (n/a) */
62 #define NE7_ST0_HD 0x04 /* upper head selected */
63 #define NE7_ST0_DR 0x03 /* drive code */
65 /* Status register ST1 */
66 #define NE7_ST1BITS "\020\010end_of_cyl\006bad_crc\005data_overrun\003sec_not_fnd\002write_protect\001no_am"
68 #define NE7_ST1_EN 0x80 /* end of cylinder, access past last record */
69 #define NE7_ST1_DE 0x20 /* data error, CRC fail in ID or data */
70 #define NE7_ST1_OR 0x10 /* DMA overrun, DMA failed to do i/o quickly */
71 #define NE7_ST1_ND 0x04 /* no data, sector not found or CRC in ID f. */
72 #define NE7_ST1_NW 0x02 /* not writeable, attempt to violate WP */
73 #define NE7_ST1_MA 0x01 /* missing address mark (in ID or data field)*/
75 /* Status register ST2 */
76 #define NE7_ST2BITS "\020\007ctrl_mrk\006bad_crc\005wrong_cyl\004scn_eq\003scn_not_fnd\002bad_cyl\001no_dam"
78 #define NE7_ST2_CM 0x40 /* control mark; found deleted data */
79 #define NE7_ST2_DD 0x20 /* data error in data field, CRC fail */
80 #define NE7_ST2_WC 0x10 /* wrong cylinder, ID field mismatches cmd */
81 #define NE7_ST2_SH 0x08 /* scan equal hit */
82 #define NE7_ST2_SN 0x04 /* scan not satisfied */
83 #define NE7_ST2_BC 0x02 /* bad cylinder, cylinder marked 0xff */
84 #define NE7_ST2_MD 0x01 /* missing address mark in data field */
86 /* Status register ST3 */
87 #define NE7_ST3BITS "\020\010fault\007write_protect\006drdy\005tk0\004two_side\003side_sel\002"
89 #define NE7_ST3_FT 0x80 /* fault; PC: n/a */
90 #define NE7_ST3_WP 0x40 /* write protected */
91 #define NE7_ST3_RD 0x20 /* ready; PC: always true */
92 #define NE7_ST3_T0 0x10 /* track 0 */
93 #define NE7_ST3_TS 0x08 /* two-sided; PC: n/a */
94 #define NE7_ST3_HD 0x04 /* upper head select */
95 #define NE7_ST3_US 0x03 /* unit select */
99 * the top three bits -- where appropriate -- are set as follows:
101 * MT - multi-track; allow both sides to be handled in single cmd
102 * MFM - modified frequency modulation; use MFM encoding
103 * SK - skip; skip sectors marked as "deleted"
106 #define NE7CMD_MT 0x80 /* READ, WRITE, WRITEDEL, READDEL, SCAN* */
107 #define NE7CMD_MFM 0x40 /* same as MT, plus READTRK, READID, FORMAT */
108 #define NE7CMD_SK 0x20 /* READ, READDEL, SCAN* */
110 #define NE7CMD_READTRK 2 /* read whole track */
111 #define NE7CMD_SPECIFY 3 /* specify drive parameters - requires unit
113 #define NE7CMD_SENSED 4 /* sense drive - requires unit select byte */
114 #define NE7CMD_WRITE 5 /* write - requires eight additional bytes */
115 #define NE7CMD_READ 6 /* read - requires eight additional bytes */
116 #define NE7CMD_RECAL 7 /* recalibrate drive - requires
117 * unit select byte */
118 #define NE7CMD_SENSEI 8 /* sense controller interrupt status */
119 #define NE7CMD_WRITEDEL 9 /* write deleted data */
120 #define NE7CMD_READID 0xa /* read ID field */
121 #define NE7CMD_READDEL 0xc /* read deleted data */
122 #define NE7CMD_FORMAT 0xd /* format - requires five additional bytes */
123 #define NE7CMD_SEEK 0xf /* seek drive - requires unit select byte
124 * and new cyl byte */
125 #define NE7CMD_SCNEQU 0x11 /* scan equal */
126 #define NE7CMD_SCNLE 0x19 /* scan less or equal */
127 #define NE7CMD_SCNGE 0x1d /* scan greater or equal */
130 * Enhanced controller commands:
132 #define NE7CMD_VERSION 0x10 /* version (ok for all controllers) */
134 #define I8207X_CONFIGURE 0x13 /* configure enhanced features */
137 * "specify" definitions
139 * acronyms (times are relative to a FDC clock of 8 MHz):
140 * srt - step rate; PC usually 3 ms
141 * hut - head unload time; PC usually maximum of 240 ms
142 * hlt - head load time; PC usually minimum of 2 ms
143 * nd - no DMA flag; PC usually not set (0)
146 #define NE7_SPEC_1(srt, hut) (((16 - (srt)) << 4) | (((hut) / 16)))
147 #define NE7_SPEC_2(hlt, nd) (((hlt) & 0xFE) | ((nd) & 1))