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fdreg.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #ifndef _LINUX_FDREG_H #define _LINUX_FDREG_H /* * This file contains some defines for the floppy disk controller. * Various sources. Mostly "IBM Microcomputers: A Programmers * Handbook", Sanches and Canton. */ /* 82077's auxiliary status registers A & B (R) */ #define FD_SRA 0 #define FD_SRB 1 /* Digital Output Register */ #define FD_DOR 2 /* 82077's tape drive register (R/W) */ #define FD_TDR 3 /* 82077's data rate select register (W) */ #define FD_DSR 4 /* Fd controller regs. S&C, about page 340 */ #define FD_STATUS 4 #define FD_DATA 5 /* Digital Input Register (read) */ #define FD_DIR 7 /* Diskette Control Register (write)*/ #define FD_DCR 7 /* Bits of main status register */ #define STATUS_BUSYMASK 0x0F /* drive busy mask */ #define STATUS_BUSY 0x10 /* FDC busy */ #define STATUS_DMA 0x20 /* 0- DMA mode */ #define STATUS_DIR 0x40 /* 0- cpu->fdc */ #define STATUS_READY 0x80 /* Data reg ready */ /* Bits of FD_ST0 */ #define ST0_DS 0x03 /* drive select mask */ #define ST0_HA 0x04 /* Head (Address) */ #define ST0_NR 0x08 /* Not Ready */ #define ST0_ECE 0x10 /* Equipment check error */ #define ST0_SE 0x20 /* Seek end */ #define ST0_INTR 0xC0 /* Interrupt code mask */ /* Bits of FD_ST1 */ #define ST1_MAM 0x01 /* Missing Address Mark */ #define ST1_WP 0x02 /* Write Protect */ #define ST1_ND 0x04 /* No Data - unreadable */ #define ST1_OR 0x10 /* OverRun */ #define ST1_CRC 0x20 /* CRC error in data or addr */ #define ST1_EOC 0x80 /* End Of Cylinder */ /* Bits of FD_ST2 */ #define ST2_MAM 0x01 /* Missing Address Mark (again) */ #define ST2_BC 0x02 /* Bad Cylinder */ #define ST2_SNS 0x04 /* Scan Not Satisfied */ #define ST2_SEH 0x08 /* Scan Equal Hit */ #define ST2_WC 0x10 /* Wrong Cylinder */ #define ST2_CRC 0x20 /* CRC error in data field */ #define ST2_CM 0x40 /* Control Mark = deleted */ /* Bits of FD_ST3 */ #define ST3_HA 0x04 /* Head (Address) */ #define ST3_DS 0x08 /* drive is double-sided */ #define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */ #define ST3_RY 0x20 /* drive is ready */ #define ST3_WP 0x40 /* Write Protect */ #define ST3_FT 0x80 /* Drive Fault */ /* Values for FD_COMMAND */ #define FD_RECALIBRATE 0x07 /* move to track 0 */ #define FD_SEEK 0x0F /* seek track */ #define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */ #define FD_WRITE 0xC5 /* write with MT, MFM */ #define FD_SENSEI 0x08 /* Sense Interrupt Status */ #define FD_SPECIFY 0x03 /* specify HUT etc */ #define FD_FORMAT 0x4D /* format one track */ #define FD_VERSION 0x10 /* get version code */ #define FD_CONFIGURE 0x13 /* configure FIFO operation */ #define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */ #define FD_GETSTATUS 0x04 /* read ST3 */ #define FD_DUMPREGS 0x0E /* dump the contents of the fdc regs */ #define FD_READID 0xEA /* prints the header of a sector */ #define FD_UNLOCK 0x14 /* Fifo config unlock */ #define FD_LOCK 0x94 /* Fifo config lock */ #define FD_RSEEK_OUT 0x8f /* seek out (i.e. to lower tracks) */ #define FD_RSEEK_IN 0xcf /* seek in (i.e. to higher tracks) */ /* the following commands are new in the 82078. They are not used in the * floppy driver, except the first three. These commands may be useful for apps * which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at * http://www.intel.com/design/archives/periphrl/docs/29046803.htm */ #define FD_PARTID 0x18 /* part id ("extended" version cmd) */ #define FD_SAVE 0x2e /* save fdc regs for later restore */ #define FD_DRIVESPEC 0x8e /* drive specification: Access to the * 2 Mbps data transfer rate for tape * drives */ #define FD_RESTORE 0x4e /* later restore */ #define FD_POWERDOWN 0x27 /* configure FDC's powersave features */ #define FD_FORMAT_N_WRITE 0xef /* format and write in one go. */ #define FD_OPTION 0x33 /* ISO format (which is a clean way to * pack more sectors on a track) */ /* DMA commands */ #define DMA_READ 0x46 #define DMA_WRITE 0x4A /* FDC version return types */ #define FDC_NONE 0x00 #define FDC_UNKNOWN 0x10 /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION FAILS EARLY */ #define FDC_8272A 0x20 /* Intel 8272a, NEC 765 */ #define FDC_765ED 0x30 /* Non-Intel 1MB-compatible FDC, can't detect */ #define FDC_82072 0x40 /* Intel 82072; 8272a + FIFO + DUMPREGS */ #define FDC_82072A 0x45 /* 82072A (on Sparcs) */ #define FDC_82077_ORIG 0x51 /* Original version of 82077AA, sans LOCK */ #define FDC_82077 0x52 /* 82077AA-1 */ #define FDC_82078_UNKN 0x5f /* Unknown 82078 variant */ #define FDC_82078 0x60 /* 44pin 82078 or 64pin 82078SL */ #define FDC_82078_1 0x61 /* 82078-1 (2Mbps fdc) */ #define FDC_S82078B 0x62 /* S82078B (first seen on Adaptec AVA-2825 VLB * SCSI/EIDE/Floppy controller) */ #define FDC_87306 0x63 /* National Semiconductor PC 87306 */ /* * Beware: the fdc type list is roughly sorted by increasing features. * Presence of features is tested by comparing the FDC version id with the * "oldest" version that has the needed feature. * If during FDC detection, an obscure test fails late in the sequence, don't * assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse. * This is especially true if the tests are unneeded. */ #define FD_RESET_DELAY 20 #endif