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/init.h>
37 #include <linux/string.h>
38
39 #include <asm/bootinfo.h>
40
41 int prom_argc;
42 char **prom_argv;
43 char **prom_envp;
44
45 void __init prom_init_cmdline(void)
46 {
47 int i;
48
49 for (i = 1; i < prom_argc; i++) {
50 strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
51 if (i < (prom_argc - 1))
52 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
53 }
54 }
55
56 char *prom_getenv(char *envname)
57 {
58 /*
59 * Return a pointer to the given environment variable.
60 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
61 */
62
63 char **env = prom_envp;
64 int i = strlen(envname);
65 int yamon = (*env && strchr(*env, '=') == NULL);
66
67 while (*env) {
68 if (yamon) {
69 if (strcmp(envname, *env++) == 0)
70 return *env;
71 } else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
72 return *env + i + 1;
73 env++;
74 }
75
76 return NULL;
77 }
78
79 static inline unsigned char str2hexnum(unsigned char c)
80 {
81 if (c >= '0' && c <= '9')
82 return c - '0';
83 if (c >= 'a' && c <= 'f')
84 return c - 'a' + 10;
85 if (c >= 'A' && c <= 'F')
86 return c - 'A' + 10;
87
88 return 0; /* foo */
89 }
90
91 static inline void str2eaddr(unsigned char *ea, unsigned char *str)
92 {
93 int i;
94
95 for (i = 0; i < 6; i++) {
96 unsigned char num;
97
98 if ((*str == '.') || (*str == ':'))
99 str++;
100 num = str2hexnum(*str++) << 4;
101 num |= str2hexnum(*str++);
102 ea[i] = num;
103 }
104 }
105
106 int __init prom_get_ethernet_addr(char *ethernet_addr)
107 {
108 char *ethaddr_str;
109
110 /* Check the environment variables first */
111 ethaddr_str = prom_getenv("ethaddr");
112 if (!ethaddr_str) {
113 /* Check command line */
114 ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
115 if (!ethaddr_str)
116 return -1;
117
118 ethaddr_str += strlen("ethaddr=");
119 }
120
121 str2eaddr(ethernet_addr, ethaddr_str);
122
123 return 0;
124 }
125
126 void __init prom_free_prom_memory(void)
127 {
128 }