1/*-
2 * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 *
24 * This software is derived from software provided by kwikbyte without
25 * copyright as follows:
26 *
27 * No warranty, expressed or implied, is included with this software.  It is
28 * provided "AS IS" and no warranty of any kind including statutory or aspects
29 * relating to merchantability or fitness for any purpose is provided.  All
30 * intellectual property rights of others is maintained with the respective
31 * owners.  This software is not copyrighted and is intended for reference
32 * only.
33 *
34 * $FreeBSD: releng/10.3/sys/boot/arm/at91/libat91/getc.c 168013 2007-03-28 22:40:37Z imp $
35 */
36
37#include "at91rm9200.h"
38#include "at91rm9200_lowlevel.h"
39#include "lib.h"
40
41/*
42 * int getc(int seconds)
43 *
44 * Reads a character from the DBGU port, if one is available within about
45 * seconds seconds.  It assumes that DBGU has already been initialized.
46 */
47int
48getc(int seconds)
49{
50	AT91PS_USART pUSART = (AT91PS_USART)AT91C_BASE_DBGU;
51	unsigned	thisSecond;
52
53	// Clamp to 20s
54	if (seconds > 20)
55	    seconds = 20;
56	thisSecond = GetSeconds();
57	seconds = thisSecond + seconds;
58	do {
59		if ((pUSART->US_CSR & AT91C_US_RXRDY))
60			return (pUSART->US_RHR & 0xFF);
61		thisSecond = GetSeconds();
62	} while (thisSecond != seconds);
63	return (-1);
64}
65