LXR linux/arch/mips/alchemy/common/prom.c

   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