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