FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/esp.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1995 Sean Eric Fagan.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the author nor the names of contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _IC_ESP_H_
    #define _IC_ESP_H_
    
    /*
     * Definitions for Hayes ESP serial cards.
     */
    
    /*
     * CMD1 and CMD2 are the command ports, offsets from <esp_iobase>.
     */
    #define ESP_CMD1        4
    #define ESP_CMD2        5
    
    /*
     * STAT1 and STAT2 are to get return values and status bytes;
     * they overload CMD1 and CMD2.
     */
    #define ESP_STATUS1     ESP_CMD1
    #define ESP_STATUS2     ESP_CMD2
    
    /*
     * Commands.  Commands are given by writing the command value to
     * ESP_CMD1 and then writing or reading some number of bytes from
     * ESP_CMD2 or ESP_STATUS2.
     */
    #define ESP_GETTEST     0x01    /* self-test command (1 byte + extras) */
    #define ESP_GETDIPS     0x02    /* get on-board DIP switches (1 byte) */
    #define ESP_SETFLOWTYPE 0x08    /* set type of flow-control (2 bytes) */
    #define ESP_SETRXFLOW   0x0a    /* set Rx FIFO flow control levels (4 bytes) */
    #define ESP_SETMODE     0x10    /* set board mode (1 byte) */
    #define ESP_SETCLOCK    0x23    /* set UART clock prescaler */
    
    /* Mode bits (ESP_SETMODE). */
    #define ESP_MODE_FIFO   0x02    /* act like a 16550 (compatibility mode) */
    #define ESP_MODE_RTS    0x04    /* use RTS hardware flow control */
    #define ESP_MODE_SCALE  0x80    /* scale FIFO trigger levels */
    
    /* Flow control type bits (ESP_SETFLOWTYPE). */
    #define ESP_FLOW_RTS    0x04    /* cmd1: local Rx sends RTS flow control */
    #define ESP_FLOW_CTS    0x10    /* cmd2: local transmitter responds to CTS */
    
    /* Used by ESP_SETRXFLOW. */
    #define HIBYTE(w)       (((w) >> 8) & 0xff)
    #define LOBYTE(w)       ((w) & 0xff)
    
    #endif /* !_IC_ESP_H_ */

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