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