include/linux/amifdreg.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_AMIFDREG_H
   3 #define _LINUX_AMIFDREG_H
   4
   5 /*
   6 ** CIAAPRA bits (read only)
   7 */
   8
   9 #define DSKRDY      (0x1<<5)        /* disk ready when low */
  10 #define DSKTRACK0   (0x1<<4)        /* head at track zero when low */
  11 #define DSKPROT     (0x1<<3)        /* disk protected when low */
  12 #define DSKCHANGE   (0x1<<2)        /* low when disk removed */
  13
  14 /*
  15 ** CIAAPRB bits (read/write)
  16 */
  17
  18 #define DSKMOTOR    (0x1<<7)        /* motor on when low */
  19 #define DSKSEL3     (0x1<<6)        /* select drive 3 when low */
  20 #define DSKSEL2     (0x1<<5)        /* select drive 2 when low */
  21 #define DSKSEL1     (0x1<<4)        /* select drive 1 when low */
  22 #define DSKSEL0     (0x1<<3)        /* select drive 0 when low */
  23 #define DSKSIDE     (0x1<<2)        /* side selection: 0 = upper, 1 = lower */
  24 #define DSKDIREC    (0x1<<1)        /* step direction: 0=in, 1=out (to trk 0) */
  25 #define DSKSTEP     (0x1)           /* pulse low to step head 1 track */
  26
  27 /*
  28 ** DSKBYTR bits (read only)
  29 */
  30
  31 #define DSKBYT      (1<<15)         /* register contains valid byte when set */
  32 #define DMAON       (1<<14)         /* disk DMA enabled */
  33 #define DISKWRITE   (1<<13)         /* disk write bit in DSKLEN enabled */
  34 #define WORDEQUAL   (1<<12)         /* DSKSYNC register match when true */
  35 /* bits 7-0 are data */
  36
  37 /*
  38 ** ADKCON/ADKCONR bits
  39 */
  40
  41 #ifndef SETCLR
  42 #define ADK_SETCLR      (1<<15)     /* control bit */
  43 #endif
  44 #define ADK_PRECOMP1    (1<<14)     /* precompensation selection */
  45 #define ADK_PRECOMP0    (1<<13)     /* 00=none, 01=140ns, 10=280ns, 11=500ns */
  46 #define ADK_MFMPREC     (1<<12)     /* 0=GCR precomp., 1=MFM precomp. */
  47 #define ADK_WORDSYNC    (1<<10)     /* enable DSKSYNC auto DMA */
  48 #define ADK_MSBSYNC     (1<<9)      /* when 1, enable sync on MSbit (for GCR) */
  49 #define ADK_FAST        (1<<8)      /* bit cell: 0=2us (GCR), 1=1us (MFM) */
  50
  51 /*
  52 ** DSKLEN bits
  53 */
  54
  55 #define DSKLEN_DMAEN    (1<<15)
  56 #define DSKLEN_WRITE    (1<<14)
  57
  58 /*
  59 ** INTENA/INTREQ bits
  60 */
  61
  62 #define DSKINDEX    (0x1<<4)        /* DSKINDEX bit */
  63
  64 /*
  65 ** Misc
  66 */
  67
  68 #define MFM_SYNC    0x4489          /* standard MFM sync value */
  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
  82 #endif /* _LINUX_AMIFDREG_H */