The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1995 Sean Eric Fagan.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the author nor the names of contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * $FreeBSD: releng/12.0/sys/dev/ic/esp.h 326022 2017-11-20 19:36:21Z pfg $
   32  */
   33 
   34 #ifndef _IC_ESP_H_
   35 #define _IC_ESP_H_
   36 
   37 /*
   38  * Definitions for Hayes ESP serial cards.
   39  */
   40 
   41 /*
   42  * CMD1 and CMD2 are the command ports, offsets from <esp_iobase>.
   43  */
   44 #define ESP_CMD1        4
   45 #define ESP_CMD2        5
   46 
   47 /*
   48  * STAT1 and STAT2 are to get return values and status bytes;
   49  * they overload CMD1 and CMD2.
   50  */
   51 #define ESP_STATUS1     ESP_CMD1
   52 #define ESP_STATUS2     ESP_CMD2
   53 
   54 /*
   55  * Commands.  Commands are given by writing the command value to
   56  * ESP_CMD1 and then writing or reading some number of bytes from
   57  * ESP_CMD2 or ESP_STATUS2.
   58  */
   59 #define ESP_GETTEST     0x01    /* self-test command (1 byte + extras) */
   60 #define ESP_GETDIPS     0x02    /* get on-board DIP switches (1 byte) */
   61 #define ESP_SETFLOWTYPE 0x08    /* set type of flow-control (2 bytes) */
   62 #define ESP_SETRXFLOW   0x0a    /* set Rx FIFO flow control levels (4 bytes) */
   63 #define ESP_SETMODE     0x10    /* set board mode (1 byte) */
   64 #define ESP_SETCLOCK    0x23    /* set UART clock prescaler */
   65 
   66 /* Mode bits (ESP_SETMODE). */
   67 #define ESP_MODE_FIFO   0x02    /* act like a 16550 (compatibility mode) */
   68 #define ESP_MODE_RTS    0x04    /* use RTS hardware flow control */
   69 #define ESP_MODE_SCALE  0x80    /* scale FIFO trigger levels */
   70 
   71 /* Flow control type bits (ESP_SETFLOWTYPE). */
   72 #define ESP_FLOW_RTS    0x04    /* cmd1: local Rx sends RTS flow control */
   73 #define ESP_FLOW_CTS    0x10    /* cmd2: local transmitter responds to CTS */
   74 
   75 /* Used by ESP_SETRXFLOW. */
   76 #define HIBYTE(w)       (((w) >> 8) & 0xff)
   77 #define LOBYTE(w)       ((w) & 0xff)
   78 
   79 #endif /* !_IC_ESP_H_ */

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