1/*
2 *
3 * BRIEF MODULE DESCRIPTION
4 *    PROM library initialisation code, supports YAMON and U-Boot.
5 *
6 * Copyright 2000-2001, 2006, 2008 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc. <source@mvista.com>
8 *
9 * This file was derived from Carsten Langgaard's
10 * arch/mips/mips-boards/xx files.
11 *
12 * Carsten Langgaard, carstenl@mips.com
13 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
14 *
15 *  This program is free software; you can redistribute  it and/or modify it
16 *  under  the terms of  the GNU General  Public License as published by the
17 *  Free Software Foundation;  either version 2 of the  License, or (at your
18 *  option) any later version.
19 *
20 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
21 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
22 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
23 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
24 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
26 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
27 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
28 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 *  You should have received a copy of the  GNU General Public License along
32 *  with this program; if not, write  to the Free Software Foundation, Inc.,
33 *  675 Mass Ave, Cambridge, MA 02139, USA.
34 */
35
36#include <linux/module.h>
37#include <linux/init.h>
38#include <linux/string.h>
39
40#include <asm/bootinfo.h>
41
42int prom_argc;
43char **prom_argv;
44char **prom_envp;
45
46void __init prom_init_cmdline(void)
47{
48	int i;
49
50	for (i = 1; i < prom_argc; i++) {
51		strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
52		if (i < (prom_argc - 1))
53			strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
54	}
55}
56
57char *prom_getenv(char *envname)
58{
59	/*
60	 * Return a pointer to the given environment variable.
61	 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
62	 */
63
64	char **env = prom_envp;
65	int i = strlen(envname);
66	int yamon = (*env && strchr(*env, '=') == NULL);
67
68	while (*env) {
69		if (yamon) {
70			if (strcmp(envname, *env++) == 0)
71				return *env;
72		} else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
73			return *env + i + 1;
74		env++;
75	}
76
77	return NULL;
78}
79
80static inline unsigned char str2hexnum(unsigned char c)
81{
82	if (c >= '0' && c <= '9')
83		return c - '0';
84	if (c >= 'a' && c <= 'f')
85		return c - 'a' + 10;
86	if (c >= 'A' && c <= 'F')
87		return c - 'A' + 10;
88
89	return 0; /* foo */
90}
91
92static inline void str2eaddr(unsigned char *ea, unsigned char *str)
93{
94	int i;
95
96	for (i = 0; i < 6; i++) {
97		unsigned char num;
98
99		if ((*str == '.') || (*str == ':'))
100			str++;
101		num  = str2hexnum(*str++) << 4;
102		num |= str2hexnum(*str++);
103		ea[i] = num;
104	}
105}
106
107int __init prom_get_ethernet_addr(char *ethernet_addr)
108{
109	char *ethaddr_str;
110
111	/* Check the environment variables first */
112	ethaddr_str = prom_getenv("ethaddr");
113	if (!ethaddr_str) {
114		/* Check command line */
115		ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
116		if (!ethaddr_str)
117			return -1;
118
119		ethaddr_str += strlen("ethaddr=");
120	}
121
122	str2eaddr(ethernet_addr, ethaddr_str);
123
124	return 0;
125}
126
127void __init prom_free_prom_memory(void)
128{
129}
130