linux/include/linux/fdreg.h
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   1#ifndef _LINUX_FDREG_H
   2#define _LINUX_FDREG_H
   3/*
   4 * This file contains some defines for the floppy disk controller.
   5 * Various sources. Mostly "IBM Microcomputers: A Programmers
   6 * Handbook", Sanches and Canton.
   7 */
   8
   9#ifdef FDPATCHES
  10#define FD_IOPORT fdc_state[fdc].address
  11#else
  12/* It would be a lot saner just to force fdc_state[fdc].address to always
  13   be set ! FIXME */
  14#define FD_IOPORT 0x3f0
  15#endif
  16
  17/* Fd controller regs. S&C, about page 340 */
  18#define FD_STATUS       (4 + FD_IOPORT )
  19#define FD_DATA         (5 + FD_IOPORT )
  20
  21/* Digital Output Register */
  22#define FD_DOR          (2 + FD_IOPORT )
  23
  24/* Digital Input Register (read) */
  25#define FD_DIR          (7 + FD_IOPORT )
  26
  27/* Diskette Control Register (write)*/
  28#define FD_DCR          (7 + FD_IOPORT )
  29
  30/* Bits of main status register */
  31#define STATUS_BUSYMASK 0x0F            /* drive busy mask */
  32#define STATUS_BUSY     0x10            /* FDC busy */
  33#define STATUS_DMA      0x20            /* 0- DMA mode */
  34#define STATUS_DIR      0x40            /* 0- cpu->fdc */
  35#define STATUS_READY    0x80            /* Data reg ready */
  36
  37/* Bits of FD_ST0 */
  38#define ST0_DS          0x03            /* drive select mask */
  39#define ST0_HA          0x04            /* Head (Address) */
  40#define ST0_NR          0x08            /* Not Ready */
  41#define ST0_ECE         0x10            /* Equipment check error */
  42#define ST0_SE          0x20            /* Seek end */
  43#define ST0_INTR        0xC0            /* Interrupt code mask */
  44
  45/* Bits of FD_ST1 */
  46#define ST1_MAM         0x01            /* Missing Address Mark */
  47#define ST1_WP          0x02            /* Write Protect */
  48#define ST1_ND          0x04            /* No Data - unreadable */
  49#define ST1_OR          0x10            /* OverRun */
  50#define ST1_CRC         0x20            /* CRC error in data or addr */
  51#define ST1_EOC         0x80            /* End Of Cylinder */
  52
  53/* Bits of FD_ST2 */
  54#define ST2_MAM         0x01            /* Missing Address Mark (again) */
  55#define ST2_BC          0x02            /* Bad Cylinder */
  56#define ST2_SNS         0x04            /* Scan Not Satisfied */
  57#define ST2_SEH         0x08            /* Scan Equal Hit */
  58#define ST2_WC          0x10            /* Wrong Cylinder */
  59#define ST2_CRC         0x20            /* CRC error in data field */
  60#define ST2_CM          0x40            /* Control Mark = deleted */
  61
  62/* Bits of FD_ST3 */
  63#define ST3_HA          0x04            /* Head (Address) */
  64#define ST3_DS          0x08            /* drive is double-sided */
  65#define ST3_TZ          0x10            /* Track Zero signal (1=track 0) */
  66#define ST3_RY          0x20            /* drive is ready */
  67#define ST3_WP          0x40            /* Write Protect */
  68#define ST3_FT          0x80            /* Drive Fault */
  69
  70/* Values for FD_COMMAND */
  71#define FD_RECALIBRATE          0x07    /* move to track 0 */
  72#define FD_SEEK                 0x0F    /* seek track */
  73#define FD_READ                 0xE6    /* read with MT, MFM, SKip deleted */
  74#define FD_WRITE                0xC5    /* write with MT, MFM */
  75#define FD_SENSEI               0x08    /* Sense Interrupt Status */
  76#define FD_SPECIFY              0x03    /* specify HUT etc */
  77#define FD_FORMAT               0x4D    /* format one track */
  78#define FD_VERSION              0x10    /* get version code */
  79#define FD_CONFIGURE            0x13    /* configure FIFO operation */
  80#define FD_PERPENDICULAR        0x12    /* perpendicular r/w mode */
  81#define FD_GETSTATUS            0x04    /* read ST3 */
  82#define FD_DUMPREGS             0x0E    /* dump the contents of the fdc regs */
  83#define FD_READID               0xEA    /* prints the header of a sector */
  84#define FD_UNLOCK               0x14    /* Fifo config unlock */
  85#define FD_LOCK                 0x94    /* Fifo config lock */
  86#define FD_RSEEK_OUT            0x8f    /* seek out (i.e. to lower tracks) */
  87#define FD_RSEEK_IN             0xcf    /* seek in (i.e. to higher tracks) */
  88
  89/* the following commands are new in the 82078. They are not used in the
  90 * floppy driver, except the first three. These commands may be useful for apps
  91 * which use the FDRAWCMD interface. For doc, get the 82078 spec sheets at
  92 * http://www.intel.com/design/archives/periphrl/docs/29046803.htm */
  93
  94#define FD_PARTID               0x18    /* part id ("extended" version cmd) */
  95#define FD_SAVE                 0x2e    /* save fdc regs for later restore */
  96#define FD_DRIVESPEC            0x8e    /* drive specification: Access to the
  97                                         * 2 Mbps data transfer rate for tape
  98                                         * drives */
  99
 100#define FD_RESTORE              0x4e    /* later restore */
 101#define FD_POWERDOWN            0x27    /* configure FDC's powersave features */
 102#define FD_FORMAT_N_WRITE       0xef    /* format and write in one go. */
 103#define FD_OPTION               0x33    /* ISO format (which is a clean way to
 104                                         * pack more sectors on a track) */
 105
 106/* DMA commands */
 107#define DMA_READ        0x46
 108#define DMA_WRITE       0x4A
 109
 110/* FDC version return types */
 111#define FDC_NONE        0x00
 112#define FDC_UNKNOWN     0x10    /* DO NOT USE THIS TYPE EXCEPT IF IDENTIFICATION
 113                                   FAILS EARLY */
 114#define FDC_8272A       0x20    /* Intel 8272a, NEC 765 */
 115#define FDC_765ED       0x30    /* Non-Intel 1MB-compatible FDC, can't detect */
 116#define FDC_82072       0x40    /* Intel 82072; 8272a + FIFO + DUMPREGS */
 117#define FDC_82072A      0x45    /* 82072A (on Sparcs) */
 118#define FDC_82077_ORIG  0x51    /* Original version of 82077AA, sans LOCK */
 119#define FDC_82077       0x52    /* 82077AA-1 */
 120#define FDC_82078_UNKN  0x5f    /* Unknown 82078 variant */
 121#define FDC_82078       0x60    /* 44pin 82078 or 64pin 82078SL */
 122#define FDC_82078_1     0x61    /* 82078-1 (2Mbps fdc) */
 123#define FDC_S82078B     0x62    /* S82078B (first seen on Adaptec AVA-2825 VLB
 124                                 * SCSI/EIDE/Floppy controller) */
 125#define FDC_87306       0x63    /* National Semiconductor PC 87306 */
 126
 127/*
 128 * Beware: the fdc type list is roughly sorted by increasing features.
 129 * Presence of features is tested by comparing the FDC version id with the
 130 * "oldest" version that has the needed feature.
 131 * If during FDC detection, an obscure test fails late in the sequence, don't
 132 * assign FDC_UNKNOWN. Else the FDC will be treated as a dumb 8272a, or worse.
 133 * This is especially true if the tests are unneeded.
 134 */
 135
 136#define FD_RESET_DELAY 20
 137#endif
 138
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