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 */
46 void
delay(unsigned int us)47 delay(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 */
63 void
putchar(int c)64 putchar(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 */
89 int
getchar(void)90 getchar(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
104 void
vpanic(const char * fmt,va_list ap)105 vpanic(const char *fmt, va_list ap)
106 {
107 printf(fmt, ap);
108 for(;;);
109
110 /* NOTREACHED */
111 }
112