aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/alchemy/common/prom.c
blob: 5340210596297fa54c8723e866aebaeb8c20269e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
/*
 *
 * BRIEF MODULE DESCRIPTION
 *    PROM library initialisation code, supports YAMON and U-Boot.
 *
 * Copyright 2000-2001, 2006, 2008 MontaVista Software Inc.
 * Author: MontaVista Software, Inc. <source@mvista.com>
 *
 * This file was derived from Carsten Langgaard's
 * arch/mips/mips-boards/xx files.
 *
 * Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  You should have received a copy of the  GNU General Public License along
 *  with this program; if not, write  to the Free Software Foundation, Inc.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>

#include <asm/bootinfo.h>

int prom_argc;
char **prom_argv;
char **prom_envp;

void __init prom_init_cmdline(void)
{
	int i;

	for (i = 1; i < prom_argc; i++) {
		strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
		if (i < (prom_argc - 1))
			strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
	}
}

char *prom_getenv(char *envname)
{
	/*
	 * Return a pointer to the given environment variable.
	 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
	 */

	char **env = prom_envp;
	int i = strlen(envname);
	int yamon = (*env && strchr(*env, '=') == NULL);

	while (*env) {
		if (yamon) {
			if (strcmp(envname, *env++) == 0)
				return *env;
		} else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
			return *env + i + 1;
		env++;
	}

	return NULL;
}

static inline unsigned char str2hexnum(unsigned char c)
{
	if (c >= '0' && c <= '9')
		return c - '0';
	if (c >= 'a' && c <= 'f')
		return c - 'a' + 10;
	if (c >= 'A' && c <= 'F')
		return c - 'A' + 10;

	return 0; /* foo */
}

static inline void str2eaddr(unsigned char *ea, unsigned char *str)
{
	int i;

	for (i = 0; i < 6; i++) {
		unsigned char num;

		if ((*str == '.') || (*str == ':'))
			str++;
		num  = str2hexnum(*str++) << 4;
		num |= str2hexnum(*str++);
		ea[i] = num;
	}
}

int __init prom_get_ethernet_addr(char *ethernet_addr)
{
	char *ethaddr_str;

	/* Check the environment variables first */
	ethaddr_str = prom_getenv("ethaddr");
	if (!ethaddr_str) {
		/* Check command line */
		ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
		if (!ethaddr_str)
			return -1;

		ethaddr_str += strlen("ethaddr=");
	}

	str2eaddr(ethernet_addr, ethaddr_str);

	return 0;
}

void __init prom_free_prom_memory(void)
{
}

Privacy Policy