1/* $Id: common.c,v 1.4 2013/10/07 17:36:40 matt 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/types.h>
34#include <sys/cdefs.h>
35
36#include <lib/libsa/stand.h>
37
38#include <arm/imx/imx23_digctlreg.h>
39#include <arm/imx/imx23_uartdbgreg.h>
40
41#include "common.h"
42
43/*
44 * Delay us microseconds.
45 */
46void
47delay(unsigned int us)
48{
49        volatile uint32_t *us_r;
50
51	us_r = (uint32_t *)(HW_DIGCTL_BASE + HW_DIGCTL_MICROSECONDS);
52
53        *us_r = 0;
54        while (*us_r < us)
55                ;
56
57        return;
58}
59
60/*
61 * Write character c to debug UART.
62 */
63void
64putchar(int c)
65{
66	volatile uint8_t *fr_r, *dr_r;
67
68	fr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGFR);
69	dr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGDR);
70
71        /* Wait until transmit FIFO has space for the new character. */
72        while (*fr_r & HW_UARTDBGFR_TXFF)
73                ;
74
75	*dr_r = c;
76#ifdef DIAGNOSTIC
77
78	/* Flush: Wait until transmit FIFO contents are written to UART. */
79	while (!(*fr_r & HW_UARTDBGFR_TXFE))
80		;
81#endif
82
83	return;
84}
85
86/*
87 * Read character from debug UART.
88 */
89int
90getchar(void)
91{
92	volatile uint8_t *fr_r, *dr_r;
93
94	fr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGFR);
95	dr_r = (uint8_t *)(HW_UARTDBG_BASE + HW_UARTDBGDR);
96
97	/* Wait until receive FIFO has character(s) */
98	while (*fr_r & HW_UARTDBGFR_RXFE)
99		;
100
101	return *dr_r;
102}
103
104void
105vpanic(const char *fmt, va_list ap)
106{
107	printf(fmt, ap);
108	for(;;);
109
110	/* NOTREACHED */
111}
112