fdreg.h

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#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.
 */

#ifdef FDPATCHES
#define FD_IOPORT fdc_state[fdc].address
#else
/* It would be a lot saner just to force fdc_state[fdc].address to always
   be set ! FIXME */
#define FD_IOPORT 0x3f0
#endif

/* Fd controller regs. S&C, about page 340 */
#define FD_STATUS   (4 + FD_IOPORT )
#define FD_DATA     (5 + FD_IOPORT )

/* Digital Output Register */
#define FD_DOR      (2 + FD_IOPORT )

/* Digital Input Register (read) */
#define FD_DIR      (7 + FD_IOPORT )

/* Diskette Control Register (write)*/
#define FD_DCR      (7 + FD_IOPORT )

/* 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