LXR linux/drivers/scsi/mesh.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * mesh.h: definitions for the driver for the MESH SCSI bus adaptor
   4 * (Macintosh Enhanced SCSI Hardware) found on Power Macintosh computers.
   5 *
   6 * Copyright (C) 1996 Paul Mackerras.
   7 */
   8#ifndef _MESH_H
   9#define _MESH_H
  10
  11/*
  12 * Registers in the MESH controller.
  13 */
  14
  15struct mesh_regs {
  16        unsigned char   count_lo;
  17        char pad0[15];
  18        unsigned char   count_hi;
  19        char pad1[15];
  20        unsigned char   fifo;
  21        char pad2[15];
  22        unsigned char   sequence;
  23        char pad3[15];
  24        unsigned char   bus_status0;
  25        char pad4[15];
  26        unsigned char   bus_status1;
  27        char pad5[15];
  28        unsigned char   fifo_count;
  29        char pad6[15];
  30        unsigned char   exception;
  31        char pad7[15];
  32        unsigned char   error;
  33        char pad8[15];
  34        unsigned char   intr_mask;
  35        char pad9[15];
  36        unsigned char   interrupt;
  37        char pad10[15];
  38        unsigned char   source_id;
  39        char pad11[15];
  40        unsigned char   dest_id;
  41        char pad12[15];
  42        unsigned char   sync_params;
  43        char pad13[15];
  44        unsigned char   mesh_id;
  45        char pad14[15];
  46        unsigned char   sel_timeout;
  47        char pad15[15];
  48};
  49
  50/* Bits in the sequence register. */
  51#define SEQ_DMA_MODE    0x80    /* use DMA for data transfer */
  52#define SEQ_TARGET      0x40    /* put the controller into target mode */
  53#define SEQ_ATN         0x20    /* assert ATN signal */
  54#define SEQ_ACTIVE_NEG  0x10    /* use active negation on REQ/ACK */
  55#define SEQ_CMD         0x0f    /* command bits: */
  56#define SEQ_ARBITRATE   1       /*  get the bus */
  57#define SEQ_SELECT      2       /*  select a target */
  58#define SEQ_COMMAND     3       /*  send a command */
  59#define SEQ_STATUS      4       /*  receive status */
  60#define SEQ_DATAOUT     5       /*  send data */
  61#define SEQ_DATAIN      6       /*  receive data */
  62#define SEQ_MSGOUT      7       /*  send a message */
  63#define SEQ_MSGIN       8       /*  receive a message */
  64#define SEQ_BUSFREE     9       /*  look for bus free */
  65#define SEQ_ENBPARITY   0x0a    /*  enable parity checking */
  66#define SEQ_DISPARITY   0x0b    /*  disable parity checking */
  67#define SEQ_ENBRESEL    0x0c    /*  enable reselection */
  68#define SEQ_DISRESEL    0x0d    /*  disable reselection */
  69#define SEQ_RESETMESH   0x0e    /*  reset the controller */
  70#define SEQ_FLUSHFIFO   0x0f    /*  clear out the FIFO */
  71
  72/* Bits in the bus_status0 and bus_status1 registers:
  73   these correspond directly to the SCSI bus control signals. */
  74#define BS0_REQ         0x20
  75#define BS0_ACK         0x10
  76#define BS0_ATN         0x08
  77#define BS0_MSG         0x04
  78#define BS0_CD          0x02
  79#define BS0_IO          0x01
  80#define BS1_RST         0x80
  81#define BS1_BSY         0x40
  82#define BS1_SEL         0x20
  83
  84/* Bus phases defined by the bits in bus_status0 */
  85#define BS0_PHASE       (BS0_MSG+BS0_CD+BS0_IO)
  86#define BP_DATAOUT      0
  87#define BP_DATAIN       BS0_IO
  88#define BP_COMMAND      BS0_CD
  89#define BP_STATUS       (BS0_CD+BS0_IO)
  90#define BP_MSGOUT       (BS0_MSG+BS0_CD)
  91#define BP_MSGIN        (BS0_MSG+BS0_CD+BS0_IO)
  92
  93/* Bits in the exception register. */
  94#define EXC_SELWATN     0x20    /* (as target) we were selected with ATN */
  95#define EXC_SELECTED    0x10    /* (as target) we were selected w/o ATN */
  96#define EXC_RESELECTED  0x08    /* (as initiator) we were reselected */
  97#define EXC_ARBLOST     0x04    /* we lost arbitration */
  98#define EXC_PHASEMM     0x02    /* SCSI phase mismatch */
  99#define EXC_SELTO       0x01    /* selection timeout */
 100
 101/* Bits in the error register */
 102#define ERR_UNEXPDISC   0x40    /* target unexpectedly disconnected */
 103#define ERR_SCSIRESET   0x20    /* SCSI bus got reset on us */
 104#define ERR_SEQERR      0x10    /* we did something the chip didn't like */
 105#define ERR_PARITY      0x01    /* parity error was detected */
 106
 107/* Bits in the interrupt and intr_mask registers */
 108#define INT_ERROR       0x04    /* error interrupt */
 109#define INT_EXCEPTION   0x02    /* exception interrupt */
 110#define INT_CMDDONE     0x01    /* command done interrupt */
 111
 112/* Fields in the sync_params register */
 113#define SYNC_OFF(x)     ((x) >> 4)      /* offset field */
 114#define SYNC_PER(x)     ((x) & 0xf)     /* period field */
 115#define SYNC_PARAMS(o, p)       (((o) << 4) | (p))
 116#define ASYNC_PARAMS    2       /* sync_params value for async xfers */
 117
 118/*
 119 * Assuming a clock frequency of 50MHz:
 120 *
 121 * The transfer period with SYNC_PER(sync_params) == x
 122 * is (x + 2) * 40ns, except that x == 0 gives 100ns.
 123 *
 124 * The units of the sel_timeout register are 10ms.
 125 */
 126
 127
 128#endif /* _MESH_H */
 129