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/kernel.h>
38 #include <linux/memblock.h>
39 #include <linux/sizes.h>
40 #include <linux/string.h>
41
42 #include <asm/bootinfo.h>
43 #include <prom.h>
44
45 int prom_argc;
46 char **prom_argv;
47 char **prom_envp;
48
49 void __init prom_init_cmdline(void)
50 {
51 int i;
52
53 for (i = 1; i < prom_argc; i++) {
54 strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
55 if (i < (prom_argc - 1))
56 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
57 }
58 }
59
60 char *prom_getenv(char *envname)
61 {
62 /*
63 * Return a pointer to the given environment variable.
64 * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
65 */
66
67 char **env = prom_envp;
68 int i = strlen(envname);
69 int yamon = (*env && strchr(*env, '=') == NULL);
70
71 while (*env) {
72 if (yamon) {
73 if (strcmp(envname, *env++) == 0)
74 return *env;
75 } else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
76 return *env + i + 1;
77 env++;
78 }
79
80 return NULL;
81 }
82
83 void __init prom_init(void)
84 {
85 unsigned char *memsize_str;
86 unsigned long memsize;
87
88 prom_argc = (int)fw_arg0;
89 prom_argv = (char **)fw_arg1;
90 prom_envp = (char **)fw_arg2;
91
92 prom_init_cmdline();
93
94 memsize_str = prom_getenv("memsize");
95 if (!memsize_str || kstrtoul(memsize_str, 0, &memsize))
96 memsize = SZ_64M; /* minimum memsize is 64MB RAM */
97
98 memblock_add(0, memsize);
99 }
100
101 static inline unsigned char str2hexnum(unsigned char c)
102 {
103 if (c >= '' && c <= '9')
104 return c - '';
105 if (c >= 'a' && c <= 'f')
106 return c - 'a' + 10;
107 if (c >= 'A' && c <= 'F')
108 return c - 'A' + 10;
109
110 return 0; /* foo */
111 }
112
113 static inline void str2eaddr(unsigned char *ea, unsigned char *str)
114 {
115 int i;
116
117 for (i = 0; i < 6; i++) {
118 unsigned char num;
119
120 if ((*str == '.') || (*str == ':'))
121 str++;
122 num = str2hexnum(*str++) << 4;
123 num |= str2hexnum(*str++);
124 ea[i] = num;
125 }
126 }
127
128 int __init prom_get_ethernet_addr(char *ethernet_addr)
129 {
130 char *ethaddr_str;
131
132 /* Check the environment variables first */
133 ethaddr_str = prom_getenv("ethaddr");
134 if (!ethaddr_str) {
135 /* Check command line */
136 ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
137 if (!ethaddr_str)
138 return -1;
139
140 ethaddr_str += strlen("ethaddr=");
141 }
142
143 str2eaddr(ethernet_addr, ethaddr_str);
144
145 return 0;
146 }
147
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