sys/dev/ic/ns16550reg.h

   1 /*      $NetBSD: ns16550reg.h,v 1.10 2013/10/03 13:23:03 kiyohara Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1991 The Regents of the University of California.
   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 University nor the names of its 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 REGENTS 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 REGENTS 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  *      @(#)ns16550.h   7.1 (Berkeley) 5/9/91
  32  */
  33
  34 /*
  35  * NS16550 UART registers
  36  */
  37
  38 #define com_data        0       /* data register (R/W) */
  39 #define com_dlbl        0       /* divisor latch low (W) */
  40 #define com_dlbh        1       /* divisor latch high (W) */
  41 #define com_ier         1       /* interrupt enable (W) */
  42 #define com_iir         2       /* interrupt identification (R) */
  43 #define com_fifo        2       /* FIFO control (W) */
  44 #define com_lctl        3       /* line control register (R/W) */
  45 #define com_cfcr        3       /* line control register (R/W) */
  46 #define com_mcr         4       /* modem control register (R/W) */
  47 #define com_lsr         5       /* line status register (R/W) */
  48 #define com_msr         6       /* modem status register (R/W) */
  49 #define com_scratch     7       /* scratch register (R/W) */
  50
  51 /*
  52  * Additional register present in NS16750
  53  */
  54 #ifdef COM_16750
  55 #define com_usr         31      /* status register (R) */
  56 #endif
  57