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
44int prom_argc;
45char **prom_argv;
46char **prom_envp;
47
48void __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
59char *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
82void __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
100static 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
112static 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
127int __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