ns16550.h revision 120116
1/*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)ns16550.h 7.1 (Berkeley) 5/9/91 34 * $FreeBSD: head/sys/dev/ic/ns16550.h 120116 2003-09-16 08:08:08Z bde $ 35 */ 36 37/* 38 * NS16550 UART registers 39 */ 40#define com_data 0 /* data register (R/W) */ 41#define com_dlbl 0 /* divisor latch low (W) */ 42#define com_dlbh 1 /* divisor latch high (W) */ 43#define com_ier 1 /* interrupt enable (W) */ 44#define com_iir 2 /* interrupt identification (R) */ 45#define com_fifo 2 /* FIFO control (W) */ 46#define com_lctl 3 /* line control register (R/W) */ 47#define com_cfcr 3 /* line control register (R/W) */ 48#define com_mcr 4 /* modem control register (R/W) */ 49#define com_lsr 5 /* line status register (R/W) */ 50#define com_msr 6 /* modem status register (R/W) */ 51#define com_scr 7 /* scratch register for 16450 up (R/W) */ 52 53/* interrupt enable register */ 54#define IER_ERXRDY 0x1 55#define IER_ETXRDY 0x2 56#define IER_ERLS 0x4 57#define IER_EMSC 0x8 58 59/* interrupt identification register */ 60#define IIR_IMASK 0xf 61#define IIR_RXTOUT 0xc 62#define IIR_RLS 0x6 63#define IIR_RXRDY 0x4 64#define IIR_TXRDY 0x2 65#define IIR_NOPEND 0x1 66#define IIR_MLSC 0x0 67#define IIR_FIFO_MASK 0xc0 /* set if FIFOs are enabled */ 68 69/* fifo control register */ 70#define FIFO_ENABLE 0x01 71#define FIFO_RCV_RST 0x02 72#define FIFO_XMT_RST 0x04 73#define FIFO_DMA_MODE 0x08 74#define FIFO_RX_LOW 0x00 75#define FIFO_RX_MEDL 0x40 76#define FIFO_RX_MEDH 0x80 77#define FIFO_RX_HIGH 0xc0 78 79/* character format control register (aka line control register) */ 80#define CFCR_DLAB 0x80 81#define CFCR_SBREAK 0x40 82#define CFCR_PZERO 0x30 83#define CFCR_PONE 0x20 84#define CFCR_PEVEN 0x10 85#define CFCR_PODD 0x00 86#define CFCR_PENAB 0x08 87#define CFCR_STOPB 0x04 88#define CFCR_8BITS 0x03 89#define CFCR_7BITS 0x02 90#define CFCR_6BITS 0x01 91#define CFCR_5BITS 0x00 92#define CFCR_EFR_ENABLE 0xbf /* magic to enable EFR on 16650 up */ 93 94/* modem control register */ 95#define MCR_PRESCALE 0x80 /* only available on 16650 up */ 96#define MCR_LOOPBACK 0x10 97#define MCR_IENABLE 0x08 98#define MCR_DRS 0x04 99#define MCR_RTS 0x02 100#define MCR_DTR 0x01 101 102/* line status register */ 103#define LSR_RCV_FIFO 0x80 104#define LSR_TSRE 0x40 105#define LSR_TXRDY 0x20 106#define LSR_BI 0x10 107#define LSR_FE 0x08 108#define LSR_PE 0x04 109#define LSR_OE 0x02 110#define LSR_RXRDY 0x01 111#define LSR_RCV_MASK 0x1f 112 113/* modem status register */ 114#define MSR_DCD 0x80 115#define MSR_RI 0x40 116#define MSR_DSR 0x20 117#define MSR_CTS 0x10 118#define MSR_DDCD 0x08 119#define MSR_TERI 0x04 120#define MSR_DDSR 0x02 121#define MSR_DCTS 0x01 122 123/* enhanced feature register (only available on 16650 up) */ 124#define com_efr com_fifo 125#define EFR_EFE 0x10 /* enhanced functions enable */ 126 127#ifdef PC98 128/* Hardware extension mode register for RSB-2000/3000. */ 129#define com_emr com_msr 130#define EMR_EXBUFF 0x04 131#define EMR_CTSFLW 0x08 132#define EMR_DSRFLW 0x10 133#define EMR_RTSFLW 0x20 134#define EMR_DTRFLW 0x40 135#define EMR_EFMODE 0x80 136#endif 137