/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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#ifndef _LINUX_FDREG_H

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#define _LINUX_FDREG_H

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/*

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* This file contains some defines for the floppy disk controller.

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* Various sources. Mostly "IBM Microcomputers: A Programmers

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* Handbook", Sanches and Canton.

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*/

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#ifdef FDPATCHES

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#define FD_IOPORT fdc_state[fdc].address

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#else

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/* It would be a lot saner just to force fdc_state[fdc].address to always

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be set ! FIXME */

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#define FD_IOPORT 0x3f0

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#endif

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/* Fd controller regs. S&C, about page 340 */

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#define FD_STATUS (4 + FD_IOPORT )

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#define FD_DATA (5 + FD_IOPORT )

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/* Digital Output Register */

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#define FD_DOR (2 + FD_IOPORT )

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/* Digital Input Register (read) */

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#define FD_DIR (7 + FD_IOPORT )

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/* Diskette Control Register (write)*/

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#define FD_DCR (7 + FD_IOPORT )

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/* Bits of main status register */

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#define STATUS_BUSYMASK 0x0F /* drive busy mask */

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#define STATUS_BUSY 0x10 /* FDC busy */

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#define STATUS_DMA 0x20 /* 0- DMA mode */

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#define STATUS_DIR 0x40 /* 0- cpu->fdc */

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#define STATUS_READY 0x80 /* Data reg ready */

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/* Bits of FD_ST0 */

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#define ST0_DS 0x03 /* drive select mask */

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#define ST0_HA 0x04 /* Head (Address) */

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#define ST0_NR 0x08 /* Not Ready */

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#define ST0_ECE 0x10 /* Equipment check error */

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#define ST0_SE 0x20 /* Seek end */

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#define ST0_INTR 0xC0 /* Interrupt code mask */

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/* Bits of FD_ST1 */

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#define ST1_MAM 0x01 /* Missing Address Mark */

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#define ST1_WP 0x02 /* Write Protect */

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#define ST1_ND 0x04 /* No Data - unreadable */

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#define ST1_OR 0x10 /* OverRun */

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#define ST1_CRC 0x20 /* CRC error in data or addr */

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#define ST1_EOC 0x80 /* End Of Cylinder */

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/* Bits of FD_ST2 */

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#define ST2_MAM 0x01 /* Missing Address Mark (again) */

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#define ST2_BC 0x02 /* Bad Cylinder */

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#define ST2_SNS 0x04 /* Scan Not Satisfied */

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#define ST2_SEH 0x08 /* Scan Equal Hit */

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#define ST2_WC 0x10 /* Wrong Cylinder */

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#define ST2_CRC 0x20 /* CRC error in data field */

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#define ST2_CM 0x40 /* Control Mark = deleted */

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/* Bits of FD_ST3 */

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#define ST3_HA 0x04 /* Head (Address) */

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#define ST3_DS 0x08 /* drive is double-sided */

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#define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */

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#define ST3_RY 0x20 /* drive is ready */

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#define ST3_WP 0x40 /* Write Protect */

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#define ST3_FT 0x80 /* Drive Fault */

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/* Values for FD_COMMAND */

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#define FD_RECALIBRATE 0x07 /* move to track 0 */

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#define FD_SEEK 0x0F /* seek track */

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#define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */

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#define FD_WRITE 0xC5 /* write with MT, MFM */

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#define FD_SENSEI 0x08 /* Sense Interrupt Status */

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#define FD_SPECIFY 0x03 /* specify HUT etc */

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#define FD_FORMAT 0x4D /* format one track */

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#define FD_VERSION 0x10 /* get version code */

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#define FD_CONFIGURE 0x13 /* configure FIFO operation */

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#define FD_PERPENDICULAR 0x12 /* perpendicular r/w mode */

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#define FD_GETSTATUS 0x04 /* read ST3 */

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#define FD_DUMPREGS 0x0E /* dump the contents of the fdc regs */

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#define FD_READID 0xEA /* prints the header of a sector */

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#define FD_UNLOCK 0x14 /* Fifo config unlock */

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#define FD_LOCK 0x94 /* Fifo config lock */

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#define FD_RSEEK_OUT 0x8f /* seek out (i.e. to lower tracks) */

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#define FD_RSEEK_IN 0xcf /* seek in (i.e. to higher tracks) */

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/* the following commands are new in the 82078. They are not used in the

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* floppy driver, except the first three. These commands may be useful for apps

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* which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at

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* http://www.intel.com/design/archives/periphrl/docs/29046803.htm */

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#define FD_PARTID 0x18 /* part id ("extended" version cmd) */

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#define FD_SAVE 0x2e /* save fdc regs for later restore */

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#define FD_DRIVESPEC 0x8e /* drive specification: Access to the

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* 2 Mbps data transfer rate for tape

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* drives */

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#define FD_RESTORE 0x4e /* later restore */

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#define FD_POWERDOWN 0x27 /* configure FDC's powersave features */

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#define FD_FORMAT_N_WRITE 0xef /* format and write in one go. */

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#define FD_OPTION 0x33 /* ISO format (which is a clean way to

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* pack more sectors on a track) */

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/* DMA commands */

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#define DMA_READ 0x46

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#define DMA_WRITE 0x4A

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/* FDC version return types */

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#define FDC_NONE 0x00

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#define FDC_UNKNOWN 0x10 /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION

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FAILS EARLY */

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#define FDC_8272A 0x20 /* Intel 8272a, NEC 765 */

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#define FDC_765ED 0x30 /* Non-Intel 1MB-compatible FDC, can't detect */

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#define FDC_82072 0x40 /* Intel 82072; 8272a + FIFO + DUMPREGS */

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#define FDC_82072A 0x45 /* 82072A (on Sparcs) */

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#define FDC_82077_ORIG 0x51 /* Original version of 82077AA, sans LOCK */

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#define FDC_82077 0x52 /* 82077AA-1 */

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#define FDC_82078_UNKN 0x5f /* Unknown 82078 variant */

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#define FDC_82078 0x60 /* 44pin 82078 or 64pin 82078SL */

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#define FDC_82078_1 0x61 /* 82078-1 (2Mbps fdc) */

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#define FDC_S82078B 0x62 /* S82078B (first seen on Adaptec AVA-2825 VLB

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* SCSI/EIDE/Floppy controller) */

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#define FDC_87306 0x63 /* National Semiconductor PC 87306 */

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/*

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* Beware: the fdc type list is roughly sorted by increasing features.

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* Presence of features is tested by comparing the FDC version id with the

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* "oldest" version that has the needed feature.

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* If during FDC detection, an obscure test fails late in the sequence, don't

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* assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse.

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* This is especially true if the tests are unneeded.

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*/

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#define FD_RESET_DELAY 20

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#endif

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