linux-imx

/* SPDX-License-Identifier: GPL-2.0 */

/*

 * mesh.h: definitions for the driver for the MESH SCSI bus adaptor

 * (Macintosh Enhanced SCSI Hardware) found on Power Macintosh computers.

 *

 * Copyright (C) 1996 Paul Mackerras.

 */

#ifndef _MESH_H

#define _MESH_H

​

/*

 * Registers in the MESH controller.

 */

​

struct mesh_regs {

    unsigned char   count_lo;

    char pad0[15];

    unsigned char   count_hi;

    char pad1[15];

    unsigned char   fifo;

    char pad2[15];

    unsigned char   sequence;

    char pad3[15];

    unsigned char   bus_status0;

    char pad4[15];

    unsigned char   bus_status1;

    char pad5[15];

    unsigned char   fifo_count;

    char pad6[15];

    unsigned char   exception;

    char pad7[15];

    unsigned char   error;

    char pad8[15];

    unsigned char   intr_mask;

    char pad9[15];

    unsigned char   interrupt;

    char pad10[15];

    unsigned char   source_id;

    char pad11[15];

    unsigned char   dest_id;

    char pad12[15];

    unsigned char   sync_params;

    char pad13[15];

    unsigned char   mesh_id;

    char pad14[15];

    unsigned char   sel_timeout;

    char pad15[15];

};

​

/* Bits in the sequence register. */

#define SEQ_DMA_MODE    0x80    /* use DMA for data transfer */

#define SEQ_TARGET  0x40    /* put the controller into target mode */

#define SEQ_ATN     0x20    /* assert ATN signal */

#define SEQ_ACTIVE_NEG  0x10    /* use active negation on REQ/ACK */

#define SEQ_CMD     0x0f    /* command bits: */

#define SEQ_ARBITRATE   1   /*  get the bus */

#define SEQ_SELECT  2   /*  select a target */

#define SEQ_COMMAND 3   /*  send a command */

#define SEQ_STATUS  4   /*  receive status */

#define SEQ_DATAOUT 5   /*  send data */

#define SEQ_DATAIN  6   /*  receive data */

#define SEQ_MSGOUT  7   /*  send a message */

#define SEQ_MSGIN   8   /*  receive a message */