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 | /* 82077's auxiliary status registers A & B (R) */ |
11 | #define FD_SRA 0 |
12 | #define FD_SRB 1 |
13 | |
14 | /* Digital Output Register */ |
15 | #define FD_DOR 2 |
16 | |
17 | /* 82077's tape drive register (R/W) */ |
18 | #define FD_TDR 3 |
19 | |
20 | /* 82077's data rate select register (W) */ |
21 | #define FD_DSR 4 |
22 | |
23 | /* Fd controller regs. S&C, about page 340 */ |
24 | #define FD_STATUS 4 |
25 | #define FD_DATA 5 |
26 | |
27 | /* Digital Input Register (read) */ |
28 | #define FD_DIR 7 |
29 | |
30 | /* Diskette Control Register (write)*/ |
31 | #define FD_DCR 7 |
32 | |
33 | /* Bits of main status register */ |
34 | #define STATUS_BUSYMASK 0x0F /* drive busy mask */ |
35 | #define STATUS_BUSY 0x10 /* FDC busy */ |
36 | #define STATUS_DMA 0x20 /* 0- DMA mode */ |
37 | #define STATUS_DIR 0x40 /* 0- cpu->fdc */ |
38 | #define STATUS_READY 0x80 /* Data reg ready */ |
39 | |
40 | /* Bits of FD_ST0 */ |
41 | #define ST0_DS 0x03 /* drive select mask */ |
42 | #define ST0_HA 0x04 /* Head (Address) */ |
43 | #define ST0_NR 0x08 /* Not Ready */ |
44 | #define ST0_ECE 0x10 /* Equipment check error */ |
45 | #define ST0_SE 0x20 /* Seek end */ |
46 | #define ST0_INTR 0xC0 /* Interrupt code mask */ |
47 | |
48 | /* Bits of FD_ST1 */ |
49 | #define ST1_MAM 0x01 /* Missing Address Mark */ |
50 | #define ST1_WP 0x02 /* Write Protect */ |
51 | #define ST1_ND 0x04 /* No Data - unreadable */ |
52 | #define ST1_OR 0x10 /* OverRun */ |
53 | #define ST1_CRC 0x20 /* CRC error in data or addr */ |
54 | #define ST1_EOC 0x80 /* End Of Cylinder */ |
55 | |
56 | /* Bits of FD_ST2 */ |
57 | #define ST2_MAM 0x01 /* Missing Address Mark (again) */ |
58 | #define ST2_BC 0x02 /* Bad Cylinder */ |
59 | #define ST2_SNS 0x04 /* Scan Not Satisfied */ |
60 | #define ST2_SEH 0x08 /* Scan Equal Hit */ |
61 | #define ST2_WC 0x10 /* Wrong Cylinder */ |
62 | #define ST2_CRC 0x20 /* CRC error in data field */ |
63 | #define ST2_CM 0x40 /* Control Mark = deleted */ |
64 | |
65 | /* Bits of FD_ST3 */ |
66 | #define ST3_HA 0x04 /* Head (Address) */ |
67 | #define ST3_DS 0x08 /* drive is double-sided */ |
68 | #define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */ |
69 | #define ST3_RY 0x20 /* drive is ready */ |
70 | #define ST3_WP 0x40 /* Write Protect */ |
71 | #define ST3_FT 0x80 /* Drive Fault */ |
72 | |
73 | /* Values for FD_COMMAND */ |
74 | #define FD_RECALIBRATE 0x07 /* move to track 0 */ |
75 | #define FD_SEEK 0x0F /* seek track */ |
76 | #define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */ |
77 | #define FD_WRITE 0xC5 /* write with MT, MFM */ |
78 | #define FD_SENSEI 0x08 /* Sense Interrupt Status */ |
79 | #define FD_SPECIFY 0x03 /* specify HUT etc */ |
80 | #define FD_FORMAT 0x4D /* format one track */ |
81 | #define FD_VERSION 0x10 /* get version code */ |
82 | #define FD_CONFIGURE 0x13 /* configure FIFO operation */ |
83 | #define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */ |
84 | #define FD_GETSTATUS 0x04 /* read ST3 */ |
85 | #define FD_DUMPREGS 0x0E /* dump the contents of the fdc regs */ |
86 | #define FD_READID 0xEA /* prints the header of a sector */ |
87 | #define FD_UNLOCK 0x14 /* Fifo config unlock */ |
88 | #define FD_LOCK 0x94 /* Fifo config lock */ |
89 | #define FD_RSEEK_OUT 0x8f /* seek out (i.e. to lower tracks) */ |
90 | #define FD_RSEEK_IN 0xcf /* seek in (i.e. to higher tracks) */ |
91 | |
92 | /* the following commands are new in the 82078. They are not used in the |
93 | * floppy driver, except the first three. These commands may be useful for apps |
94 | * which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at |
95 | * http://www.intel.com/design/archives/periphrl/docs/29046803.htm */ |
96 | |
97 | #define FD_PARTID 0x18 /* part id ("extended" version cmd) */ |
98 | #define FD_SAVE 0x2e /* save fdc regs for later restore */ |
99 | #define FD_DRIVESPEC 0x8e /* drive specification: Access to the |
100 | * 2 Mbps data transfer rate for tape |
101 | * drives */ |
102 | |
103 | #define FD_RESTORE 0x4e /* later restore */ |
104 | #define FD_POWERDOWN 0x27 /* configure FDC's powersave features */ |
105 | #define FD_FORMAT_N_WRITE 0xef /* format and write in one go. */ |
106 | #define FD_OPTION 0x33 /* ISO format (which is a clean way to |
107 | * pack more sectors on a track) */ |
108 | |
109 | /* DMA commands */ |
110 | #define DMA_READ 0x46 |
111 | #define DMA_WRITE 0x4A |
112 | |
113 | /* FDC version return types */ |
114 | #define FDC_NONE 0x00 |
115 | #define FDC_UNKNOWN 0x10 /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION |
116 | FAILS EARLY */ |
117 | #define FDC_8272A 0x20 /* Intel 8272a, NEC 765 */ |
118 | #define FDC_765ED 0x30 /* Non-Intel 1MB-compatible FDC, can't detect */ |
119 | #define FDC_82072 0x40 /* Intel 82072; 8272a + FIFO + DUMPREGS */ |
120 | #define FDC_82072A 0x45 /* 82072A (on Sparcs) */ |
121 | #define FDC_82077_ORIG 0x51 /* Original version of 82077AA, sans LOCK */ |
122 | #define FDC_82077 0x52 /* 82077AA-1 */ |
123 | #define FDC_82078_UNKN 0x5f /* Unknown 82078 variant */ |
124 | #define FDC_82078 0x60 /* 44pin 82078 or 64pin 82078SL */ |
125 | #define FDC_82078_1 0x61 /* 82078-1 (2Mbps fdc) */ |
126 | #define FDC_S82078B 0x62 /* S82078B (first seen on Adaptec AVA-2825 VLB |
127 | * SCSI/EIDE/Floppy controller) */ |
128 | #define FDC_87306 0x63 /* National Semiconductor PC 87306 */ |
129 | |
130 | /* |
131 | * Beware: the fdc type list is roughly sorted by increasing features. |
132 | * Presence of features is tested by comparing the FDC version id with the |
133 | * "oldest" version that has the needed feature. |
134 | * If during FDC detection, an obscure test fails late in the sequence, don't |
135 | * assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse. |
136 | * This is especially true if the tests are unneeded. |
137 | */ |
138 | |
139 | #define FD_RESET_DELAY 20 |
140 | #endif |
141 | |