common.c revision 1.1 
1/* $Id: common.c,v 1.1 2012/11/20 19:08:46 jkunz Exp $ */
2
3/*
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Petri Laakso.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/param.h>
33#include <sys/cdefs.h>
34
35#include <arm/imx/imx23_digctlreg.h>
36#include <arm/imx/imx23_uartdbgreg.h>
37
38#include "common.h"
39
40/*
41 * Delay "delay" microseconds.
42 */
43void
44delay_us(unsigned int delay)
45{
46
47	/* Set microsecond timer to 0 */
48	REG_WRITE(HW_DIGCTL_BASE + HW_DIGCTL_MICROSECONDS_CLR, 0xFFFFFFFF);
49
50	while (REG_READ(HW_DIGCTL_BASE + HW_DIGCTL_MICROSECONDS) < delay);
51
52	return;
53}
54
55/*
56 * Write character to debug UART.
57 */
58void
59putchar(int ch)
60{
61
62	/* Wait until transmit FIFO has space for the new character. */
63	while (REG_READ(HW_UARTDBG_BASE + HW_UARTDBGFR) & HW_UARTDBGFR_TXFF);
64
65	REG_WRITE_BYTE(HW_UARTDBG_BASE + HW_UARTDBGDR,
66	    __SHIFTIN(ch, HW_UARTDBGDR_DATA));
67
68	return;
69}
70