ns16550.h revision 1.4 
1/*	$NetBSD: ns16550.h,v 1.4 2008/03/23 17:19:57 tsutsui Exp $	*/
2
3/*-
4 * Copyright (C) 1995-1997 Gary Thomas (gdt@linuxppc.org)
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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *      This product includes software developed by Gary Thomas.
18 * 4. The name of the author may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33/*
34 * NS16550 Serial Port
35 */
36
37struct NS16550 {
38		volatile uint8_t rbr;  /* 0 */
39		volatile uint8_t ier;  /* 1 */
40		volatile uint8_t fcr;  /* 2 */
41		volatile uint8_t lcr;  /* 3 */
42		volatile uint8_t mcr;  /* 4 */
43		volatile uint8_t lsr;  /* 5 */
44		volatile uint8_t msr;  /* 6 */
45		volatile uint8_t scr;  /* 7 */
46};
47
48#define thr rbr
49#define iir fcr
50#define dll rbr
51#define dlm ier
52
53#define LSR_DR   0x01  /* Data ready */
54#define LSR_OE   0x02  /* Overrun */
55#define LSR_PE   0x04  /* Parity error */
56#define LSR_FE   0x08  /* Framing error */
57#define LSR_BI   0x10  /* Break */
58#define LSR_THRE 0x20  /* Xmit holding register empty */
59#define LSR_TEMT 0x40  /* Xmitter empty */
60#define LSR_ERR  0x80  /* Error */
61
62#define LCR_EERS 0xBF  /* Enable access to Enhanced Register Set */
63#define LCR_DLAB 0x80  /* Divisor latch access enable */
64
65#ifndef COMPROBE
66#define COMPROBE 0xa020001c
67#endif
68
69volatile struct NS16550 *NS16550_init(int, int);
70void NS16550_putc(volatile struct NS16550 *, int);
71int NS16550_getc(volatile struct NS16550 *);
72int NS16550_scankbd(volatile struct NS16550 *);
73int NS16550_test(volatile struct NS16550 *);
74