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