1 /* $NetBSD: ns16550.c,v 1.8 2009/03/14 15:36:04 dsl 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
42 volatile struct NS16550 *
NS16550_init(int addr,int speed)43 NS16550_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 = 0x00;
56 com_port->fcr = 0x07; /* Clear & enable FIFOs */
57 com_port->ier = 0x00;
58
59 return (com_port);
60 }
61
62 void
NS16550_putc(volatile struct NS16550 * com_port,int c)63 NS16550_putc(volatile struct NS16550 *com_port, int c)
64 {
65 while ((com_port->lsr & LSR_THRE) == 0)
66 ;
67 com_port->thr = c;
68 }
69
70 int
NS16550_getc(volatile struct NS16550 * com_port)71 NS16550_getc(volatile struct NS16550 *com_port)
72 {
73 while ((com_port->lsr & LSR_DR) == 0)
74 ;
75 return (com_port->rbr);
76 }
77
78 int
NS16550_scankbd(volatile struct NS16550 * com_port)79 NS16550_scankbd(volatile struct NS16550 *com_port)
80 {
81 if ((com_port->lsr & LSR_DR) == 0)
82 return -1;
83 return (com_port->rbr);
84 }
85
86 int
NS16550_test(volatile struct NS16550 * com_port)87 NS16550_test(volatile struct NS16550 *com_port)
88 {
89 return ((com_port->lsr & LSR_DR) != 0);
90 }
91 #endif /* CONS_SERIAL */
92