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 #ifdef FDPATCHES
11 #define FD_IOPORT fdc_state[fdc].address
12 #else
13 /* It would be a lot saner just to force fdc_state[fdc].address to always
14 be set ! FIXME */
15 #define FD_IOPORT 0x3f0
16 #endif
17
18 /* Fd controller regs. S&C, about page 340 */
19 #define FD_STATUS (4 + FD_IOPORT )
20 #define FD_DATA (5 + FD_IOPORT )
21
22 /* Digital Output Register */
23 #define FD_DOR (2 + FD_IOPORT )
24
25 /* Digital Input Register (read) */
26 #define FD_DIR (7 + FD_IOPORT )
27
28 /* Diskette Control Register (write)*/
29 #define FD_DCR (7 + FD_IOPORT )
30
31 /* Bits of main status register */
32 #define STATUS_BUSYMASK 0x0F /* drive busy mask */
33 #define STATUS_BUSY 0x10 /* FDC busy */
34 #define STATUS_DMA 0x20 /* 0- DMA mode */
35 #define STATUS_DIR 0x40 /* 0- cpu->fdc */
36 #define STATUS_READY 0x80 /* Data reg ready */
37
38 /* Bits of FD_ST0 */
39 #define ST0_DS 0x03 /* drive select mask */
40 #define ST0_HA 0x04 /* Head (Address) */
41 #define ST0_NR 0x08 /* Not Ready */
42 #define ST0_ECE 0x10 /* Equipment check error */
43 #define ST0_SE 0x20 /* Seek end */
44 #define ST0_INTR 0xC0 /* Interrupt code mask */
45
46 /* Bits of FD_ST1 */
47 #define ST1_MAM 0x01 /* Missing Address Mark */
48 #define ST1_WP 0x02 /* Write Protect */
49 #define ST1_ND 0x04 /* No Data - unreadable */
50 #define ST1_OR 0x10 /* OverRun */
51 #define ST1_CRC 0x20 /* CRC error in data or addr */
52 #define ST1_EOC 0x80 /* End Of Cylinder */
53
54 /* Bits of FD_ST2 */
55 #define ST2_MAM 0x01 /* Missing Address Mark (again) */
56 #define ST2_BC 0x02 /* Bad Cylinder */
57 #define ST2_SNS 0x04 /* Scan Not Satisfied */
58 #define ST2_SEH 0x08 /* Scan Equal Hit */
59 #define ST2_WC 0x10 /* Wrong Cylinder */
60 #define ST2_CRC 0x20 /* CRC error in data field */
61 #define ST2_CM 0x40 /* Control Mark = deleted */
62
63 /* Bits of FD_ST3 */
64 #define ST3_HA 0x04 /* Head (Address) */
65 #define ST3_DS 0x08 /* drive is double-sided */
66 #define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */
67 #define ST3_RY 0x20 /* drive is ready */
68 #define ST3_WP 0x40 /* Write Protect */
69 #define ST3_FT 0x80 /* Drive Fault */
70
71 /* Values for FD_COMMAND */
72 #define FD_RECALIBRATE 0x07 /* move to track 0 */
73 #define FD_SEEK 0x0F /* seek track */
74 #define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */
75 #define FD_WRITE 0xC5 /* write with MT, MFM */
76 #define FD_SENSEI 0x08 /* Sense Interrupt Status */
77 #define FD_SPECIFY 0x03 /* specify HUT etc */
78 #define FD_FORMAT 0x4D /* format one track */
79 #define FD_VERSION 0x10 /* get version code */
80 #define FD_CONFIGURE 0x13 /* configure FIFO operation */
81 #define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */
82 #define FD_GETSTATUS 0x04 /* read ST3 */
83 #define FD_DUMPREGS 0x0E /* dump the contents of the fdc regs */
84 #define FD_READID 0xEA /* prints the header of a sector */
85 #define FD_UNLOCK 0x14 /* Fifo config unlock */
86 #define FD_LOCK 0x94 /* Fifo config lock */
87 #define FD_RSEEK_OUT 0x8f /* seek out (i.e. to lower tracks) */
88 #define FD_RSEEK_IN 0xcf /* seek in (i.e. to higher tracks) */
89
90 /* the following commands are new in the 82078. They are not used in the
91 * floppy driver, except the first three. These commands may be useful for apps
92 * which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at
93 * http://www.intel.com/design/archives/periphrl/docs/29046803.htm */
94
95 #define FD_PARTID 0x18 /* part id ("extended" version cmd) */
96 #define FD_SAVE 0x2e /* save fdc regs for later restore */
97 #define FD_DRIVESPEC 0x8e /* drive specification: Access to the
98 * 2 Mbps data transfer rate for tape
99 * drives */
100
101 #define FD_RESTORE 0x4e /* later restore */
102 #define FD_POWERDOWN 0x27 /* configure FDC's powersave features */
103 #define FD_FORMAT_N_WRITE 0xef /* format and write in one go. */
104 #define FD_OPTION 0x33 /* ISO format (which is a clean way to
105 * pack more sectors on a track) */
106
107 /* DMA commands */
108 #define DMA_READ 0x46
109 #define DMA_WRITE 0x4A
110
111 /* FDC version return types */
112 #define FDC_NONE 0x00
113 #define FDC_UNKNOWN 0x10 /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION
114 FAILS EARLY */
115 #define FDC_8272A 0x20 /* Intel 8272a, NEC 765 */
116 #define FDC_765ED 0x30 /* Non-Intel 1MB-compatible FDC, can't detect */
117 #define FDC_82072 0x40 /* Intel 82072; 8272a + FIFO + DUMPREGS */
118 #define FDC_82072A 0x45 /* 82072A (on Sparcs) */
119 #define FDC_82077_ORIG 0x51 /* Original version of 82077AA, sans LOCK */
120 #define FDC_82077 0x52 /* 82077AA-1 */
121 #define FDC_82078_UNKN 0x5f /* Unknown 82078 variant */
122 #define FDC_82078 0x60 /* 44pin 82078 or 64pin 82078SL */
123 #define FDC_82078_1 0x61 /* 82078-1 (2Mbps fdc) */
124 #define FDC_S82078B 0x62 /* S82078B (first seen on Adaptec AVA-2825 VLB
125 * SCSI/EIDE/Floppy controller) */
126 #define FDC_87306 0x63 /* National Semiconductor PC 87306 */
127
128 /*
129 * Beware: the fdc type list is roughly sorted by increasing features.
130 * Presence of features is tested by comparing the FDC version id with the
131 * "oldest" version that has the needed feature.
132 * If during FDC detection, an obscure test fails late in the sequence, don't
133 * assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse.
134 * This is especially true if the tests are unneeded.
135 */
136
137 #define FD_RESET_DELAY 20
138 #endif