linux/drivers/scsi/mesh.h
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   1/*
   2 * mesh.h: definitions for the driver for the MESH SCSI bus adaptor
   3 * (Macintosh Enhanced SCSI Hardware) found on Power Macintosh computers.
   4 *
   5 * Copyright (C) 1996 Paul Mackerras.
   6 */
   7#ifndef _MESH_H
   8#define _MESH_H
   9
  10/*
  11 * Registers in the MESH controller.
  12 */
  13
  14struct mesh_regs {
  15        unsigned char   count_lo;
  16        char pad0[15];
  17        unsigned char   count_hi;
  18        char pad1[15];
  19        unsigned char   fifo;
  20        char pad2[15];
  21        unsigned char   sequence;
  22        char pad3[15];
  23        unsigned char   bus_status0;
  24        char pad4[15];
  25        unsigned char   bus_status1;
  26        char pad5[15];
  27        unsigned char   fifo_count;
  28        char pad6[15];
  29        unsigned char   exception;
  30        char pad7[15];
  31        unsigned char   error;
  32        char pad8[15];
  33        unsigned char   intr_mask;
  34        char pad9[15];
  35        unsigned char   interrupt;
  36        char pad10[15];
  37        unsigned char   source_id;
  38        char pad11[15];
  39        unsigned char   dest_id;
  40        char pad12[15];
  41        unsigned char   sync_params;
  42        char pad13[15];
  43        unsigned char   mesh_id;
  44        char pad14[15];
  45        unsigned char   sel_timeout;
  46        char pad15[15];
  47};
  48
  49/* Bits in the sequence register. */
  50#define SEQ_DMA_MODE    0x80    /* use DMA for data transfer */
  51#define SEQ_TARGET      0x40    /* put the controller into target mode */
  52#define SEQ_ATN         0x20    /* assert ATN signal */
  53#define SEQ_ACTIVE_NEG  0x10    /* use active negation on REQ/ACK */
  54#define SEQ_CMD         0x0f    /* command bits: */
  55#define SEQ_ARBITRATE   1       /*  get the bus */
  56#define SEQ_SELECT      2       /*  select a target */
  57#define SEQ_COMMAND     3       /*  send a command */
  58#define SEQ_STATUS      4       /*  receive status */
  59#define SEQ_DATAOUT     5       /*  send data */
  60#define SEQ_DATAIN      6       /*  receive data */
  61#define SEQ_MSGOUT      7       /*  send a message */
  62#define SEQ_MSGIN       8       /*  receive a message */
  63#define SEQ_BUSFREE     9       /*  look for bus free */
  64#define SEQ_ENBPARITY   0x0a    /*  enable parity checking */
  65#define SEQ_DISPARITY   0x0b    /*  disable parity checking */
  66#define SEQ_ENBRESEL    0x0c    /*  enable reselection */
  67#define SEQ_DISRESEL    0x0d    /*  disable reselection */
  68#define SEQ_RESETMESH   0x0e    /*  reset the controller */
  69#define SEQ_FLUSHFIFO   0x0f    /*  clear out the FIFO */
  70
  71/* Bits in the bus_status0 and bus_status1 registers:
  72   these correspond directly to the SCSI bus control signals. */
  73#define BS0_REQ         0x20
  74#define BS0_ACK         0x10
  75#define BS0_ATN         0x08
  76#define BS0_MSG         0x04
  77#define BS0_CD          0x02
  78#define BS0_IO          0x01
  79#define BS1_RST         0x80
  80#define BS1_BSY         0x40
  81#define BS1_SEL         0x20
  82
  83/* Bus phases defined by the bits in bus_status0 */
  84#define BS0_PHASE       (BS0_MSG+BS0_CD+BS0_IO)
  85#define BP_DATAOUT      0
  86#define BP_DATAIN       BS0_IO
  87#define BP_COMMAND      BS0_CD
  88#define BP_STATUS       (BS0_CD+BS0_IO)
  89#define BP_MSGOUT       (BS0_MSG+BS0_CD)
  90#define BP_MSGIN        (BS0_MSG+BS0_CD+BS0_IO)
  91
  92/* Bits in the exception register. */
  93#define EXC_SELWATN     0x20    /* (as target) we were selected with ATN */
  94#define EXC_SELECTED    0x10    /* (as target) we were selected w/o ATN */
  95#define EXC_RESELECTED  0x08    /* (as initiator) we were reselected */
  96#define EXC_ARBLOST     0x04    /* we lost arbitration */
  97#define EXC_PHASEMM     0x02    /* SCSI phase mismatch */
  98#define EXC_SELTO       0x01    /* selection timeout */
  99
 100/* Bits in the error register */
 101#define ERR_UNEXPDISC   0x40    /* target unexpectedly disconnected */
 102#define ERR_SCSIRESET   0x20    /* SCSI bus got reset on us */
 103#define ERR_SEQERR      0x10    /* we did something the chip didn't like */
 104#define ERR_PARITY      0x01    /* parity error was detected */
 105
 106/* Bits in the interrupt and intr_mask registers */
 107#define INT_ERROR       0x04    /* error interrupt */
 108#define INT_EXCEPTION   0x02    /* exception interrupt */
 109#define INT_CMDDONE     0x01    /* command done interrupt */
 110
 111/* Fields in the sync_params register */
 112#define SYNC_OFF(x)     ((x) >> 4)      /* offset field */
 113#define SYNC_PER(x)     ((x) & 0xf)     /* period field */
 114#define SYNC_PARAMS(o, p)       (((o) << 4) | (p))
 115#define ASYNC_PARAMS    2       /* sync_params value for async xfers */
 116
 117/*
 118 * Assuming a clock frequency of 50MHz:
 119 *
 120 * The transfer period with SYNC_PER(sync_params) == x
 121 * is (x + 2) * 40ns, except that x == 0 gives 100ns.
 122 *
 123 * The units of the sel_timeout register are 10ms.
 124 */
 125
 126
 127#endif /* _MESH_H */
 128
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