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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _LINUX_FDREG_H
3#define _LINUX_FDREG_H
4/*
5 * This file contains some defines for the floppy disk controller.
6 * Various sources. Mostly "IBM Microcomputers: A Programmers
7 * Handbook", Sanches and Canton.
8 */
9
10/* Fd controller regs. S&C, about page 340 */
11#define FD_STATUS 4
12#define FD_DATA 5
13
14/* Digital Output Register */
15#define FD_DOR 2
16
17/* Digital Input Register (read) */
18#define FD_DIR 7
19
20/* Diskette Control Register (write)*/
21#define FD_DCR 7
22
23/* Bits of main status register */
24#define STATUS_BUSYMASK 0x0F /* drive busy mask */
25#define STATUS_BUSY 0x10 /* FDC busy */
26#define STATUS_DMA 0x20 /* 0- DMA mode */
27#define STATUS_DIR 0x40 /* 0- cpu->fdc */
28#define STATUS_READY 0x80 /* Data reg ready */
29
30/* Bits of FD_ST0 */
31#define ST0_DS 0x03 /* drive select mask */
32#define ST0_HA 0x04 /* Head (Address) */
33#define ST0_NR 0x08 /* Not Ready */
34#define ST0_ECE 0x10 /* Equipment check error */
35#define ST0_SE 0x20 /* Seek end */
36#define ST0_INTR 0xC0 /* Interrupt code mask */
37
38/* Bits of FD_ST1 */
39#define ST1_MAM 0x01 /* Missing Address Mark */
40#define ST1_WP 0x02 /* Write Protect */
41#define ST1_ND 0x04 /* No Data - unreadable */
42#define ST1_OR 0x10 /* OverRun */
43#define ST1_CRC 0x20 /* CRC error in data or addr */
44#define ST1_EOC 0x80 /* End Of Cylinder */
45
46/* Bits of FD_ST2 */
47#define ST2_MAM 0x01 /* Missing Address Mark (again) */
48#define ST2_BC 0x02 /* Bad Cylinder */
49#define ST2_SNS 0x04 /* Scan Not Satisfied */
50#define ST2_SEH 0x08 /* Scan Equal Hit */
51#define ST2_WC 0x10 /* Wrong Cylinder */
52#define ST2_CRC 0x20 /* CRC error in data field */
53#define ST2_CM 0x40 /* Control Mark = deleted */
54
55/* Bits of FD_ST3 */
56#define ST3_HA 0x04 /* Head (Address) */
57#define ST3_DS 0x08 /* drive is double-sided */
58#define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */
59#define ST3_RY 0x20 /* drive is ready */
60#define ST3_WP 0x40 /* Write Protect */
61#define ST3_FT 0x80 /* Drive Fault */
62
63/* Values for FD_COMMAND */
64#define FD_RECALIBRATE 0x07 /* move to track 0 */
65#define FD_SEEK 0x0F /* seek track */
66#define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */
67#define FD_WRITE 0xC5 /* write with MT, MFM */
68#define FD_SENSEI 0x08 /* Sense Interrupt Status */
69#define FD_SPECIFY 0x03 /* specify HUT etc */
70#define FD_FORMAT 0x4D /* format one track */
71#define FD_VERSION 0x10 /* get version code */
72#define FD_CONFIGURE 0x13 /* configure FIFO operation */
73#define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */
74#define FD_GETSTATUS 0x04 /* read ST3 */
75#define FD_DUMPREGS 0x0E /* dump the contents of the fdc regs */
76#define FD_READID 0xEA /* prints the header of a sector */
77#define FD_UNLOCK 0x14 /* Fifo config unlock */
78#define FD_LOCK 0x94 /* Fifo config lock */
79#define FD_RSEEK_OUT 0x8f /* seek out (i.e. to lower tracks) */
80#define FD_RSEEK_IN 0xcf /* seek in (i.e. to higher tracks) */
81
82/* the following commands are new in the 82078. They are not used in the
83 * floppy driver, except the first three. These commands may be useful for apps
84 * which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at
85 * http://www.intel.com/design/archives/periphrl/docs/29046803.htm */
86
87#define FD_PARTID 0x18 /* part id ("extended" version cmd) */
88#define FD_SAVE 0x2e /* save fdc regs for later restore */
89#define FD_DRIVESPEC 0x8e /* drive specification: Access to the
90 * 2 Mbps data transfer rate for tape
91 * drives */
92
93#define FD_RESTORE 0x4e /* later restore */
94#define FD_POWERDOWN 0x27 /* configure FDC's powersave features */
95#define FD_FORMAT_N_WRITE 0xef /* format and write in one go. */
96#define FD_OPTION 0x33 /* ISO format (which is a clean way to
97 * pack more sectors on a track) */
98
99/* DMA commands */
100#define DMA_READ 0x46
101#define DMA_WRITE 0x4A
102
103/* FDC version return types */
104#define FDC_NONE 0x00
105#define FDC_UNKNOWN 0x10 /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION
106 FAILS EARLY */
107#define FDC_8272A 0x20 /* Intel 8272a, NEC 765 */
108#define FDC_765ED 0x30 /* Non-Intel 1MB-compatible FDC, can't detect */
109#define FDC_82072 0x40 /* Intel 82072; 8272a + FIFO + DUMPREGS */
110#define FDC_82072A 0x45 /* 82072A (on Sparcs) */
111#define FDC_82077_ORIG 0x51 /* Original version of 82077AA, sans LOCK */
112#define FDC_82077 0x52 /* 82077AA-1 */
113#define FDC_82078_UNKN 0x5f /* Unknown 82078 variant */
114#define FDC_82078 0x60 /* 44pin 82078 or 64pin 82078SL */
115#define FDC_82078_1 0x61 /* 82078-1 (2Mbps fdc) */
116#define FDC_S82078B 0x62 /* S82078B (first seen on Adaptec AVA-2825 VLB
117 * SCSI/EIDE/Floppy controller) */
118#define FDC_87306 0x63 /* National Semiconductor PC 87306 */
119
120/*
121 * Beware: the fdc type list is roughly sorted by increasing features.
122 * Presence of features is tested by comparing the FDC version id with the
123 * "oldest" version that has the needed feature.
124 * If during FDC detection, an obscure test fails late in the sequence, don't
125 * assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse.
126 * This is especially true if the tests are unneeded.
127 */
128
129#define FD_RESET_DELAY 20
130#endif