1/*	$NetBSD: ns16550.c,v 1.2.26.1 2007/05/22 17:27:23 matt 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#ifdef CONS_SERIAL
34/*
35 * NS16550 support
36 */
37
38#include <lib/libsa/stand.h>
39#include "boot.h"
40#include "ns16550.h"
41
42volatile struct NS16550 *
43NS16550_init(int addr, int speed)
44{
45	struct NS16550 *com_port;
46
47	com_port = (struct NS16550 *)(COMBASE + addr);
48
49	com_port->lcr = 0x80;  /* Access baud rate */
50	speed = comspeed(speed);
51	com_port->dll = speed;
52	com_port->dlm = speed >> 8;
53
54	com_port->lcr = 0x03;  /* 8 data, 1 stop, no parity */
55	com_port->mcr = 0x03;  /* Set DTR and RTS */
56	com_port->fcr = 0x07;  /* Clear & enable FIFOs */
57	com_port->ier = 0x00;
58
59	return (com_port);
60}
61
62void
63NS16550_putc(volatile struct NS16550 *com_port, int c)
64{
65
66	while ((com_port->lsr & LSR_THRE) == 0)
67		;
68	com_port->thr = c;
69}
70
71int
72NS16550_getc(volatile struct NS16550 *com_port)
73{
74
75	while ((com_port->lsr & LSR_DR) == 0)
76		;
77	return (com_port->rbr);
78}
79
80int
81NS16550_scankbd(volatile struct NS16550 *com_port)
82{
83
84	if ((com_port->lsr & LSR_DR) == 0)
85		return -1;
86	return (com_port->rbr);
87}
88
89int
90NS16550_test(volatile struct NS16550 *com_port)
91{
92
93	return ((com_port->lsr & LSR_DR) != 0);
94}
95#endif /* CONS_SERIAL */
96