1 /* $OpenBSD: ns16550reg.h,v 1.6 2022/01/11 11:51:14 uaa Exp $ */ 2 /* $NetBSD: ns16550reg.h,v 1.4 1994/10/27 04:18:43 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1991 The Regents of the University of California. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)ns16550.h 7.1 (Berkeley) 5/9/91 33 */ 34 35 /* 36 * NS16550 (and above) UART registers 37 */ 38 39 #define com_data 0 /* data register (R/W) */ 40 #define com_dlbl 0 /* divisor latch low (W) */ 41 #define com_dlbh 1 /* divisor latch high (W) */ 42 #define com_ier 1 /* interrupt enable (W) */ 43 #define com_iir 2 /* interrupt identification (R) */ 44 #define com_fifo 2 /* FIFO control (W) */ 45 #define com_fctl 2 /* extended FIFO control (W) */ 46 #define com_efr 2 /* extended features register (W) */ 47 #define com_lctl 3 /* line control register (R/W) */ 48 #define com_cfcr 3 /* line control register (R/W) */ 49 #define com_mcr 4 /* modem control register (R/W) */ 50 #define com_lsr 5 /* line status register (R/W) */ 51 #define com_msr 6 /* modem status register (R/W) */ 52 #define com_scratch 7 /* scratch register (R/W) */ 53 54 /* 55 * Synopsys DesignWare APB UART additional registers 56 */ 57 #define com_usr 31 /* UART status register (R) */ 58 #define com_cpr 61 /* component parameter register (R) */ 59