LXR linux/arch/mips/au1000/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 MontaVista Software Inc.
   7 * Author: MontaVista Software, Inc.
   8 *              ppopov@mvista.com or source@mvista.com
   9 *
  10 * This file was derived from Carsten Langgaard's
  11 * arch/mips/mips-boards/xx files.
  12 *
  13 * Carsten Langgaard, carstenl@mips.com
  14 * Copyright (C) 1999,2000 MIPS Technologies, Inc.  All rights reserved.
  15 *
  16 *  This program is free software; you can redistribute  it and/or modify it
  17 *  under  the terms of  the GNU General  Public License as published by the
  18 *  Free Software Foundation;  either version 2 of the  License, or (at your
  19 *  option) any later version.
  20 *
  21 *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  22 *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  23 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  24 *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  25 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  26 *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  27 *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  28 *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  29 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  30 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31 *
  32 *  You should have received a copy of the  GNU General Public License along
  33 *  with this program; if not, write  to the Free Software Foundation, Inc.,
  34 *  675 Mass Ave, Cambridge, MA 02139, USA.
  35 */
  36
  37#include <linux/module.h>
  38#include <linux/kernel.h>
  39#include <linux/init.h>
  40#include <linux/string.h>
  41
  42#include <asm/bootinfo.h>
  43
  44/* #define DEBUG_CMDLINE */
  45
  46extern int prom_argc;
  47extern char **prom_argv, **prom_envp;
  48
  49
  50char * __init_or_module prom_getcmdline(void)
  51{
  52        return &(arcs_cmdline[0]);
  53}
  54
  55void  prom_init_cmdline(void)
  56{
  57        char *cp;
  58        int actr;
  59
  60        actr = 1; /* Always ignore argv[0] */
  61
  62        cp = &(arcs_cmdline[0]);
  63        while(actr < prom_argc) {
  64                strcpy(cp, prom_argv[actr]);
  65                cp += strlen(prom_argv[actr]);
  66                *cp++ = ' ';
  67                actr++;
  68        }
  69        if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */
  70                --cp;
  71        if (prom_argc > 1)
  72                *cp = '\0';
  73
  74}
  75
  76
  77char *prom_getenv(char *envname)
  78{
  79        /*
  80         * Return a pointer to the given environment variable.
  81         * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
  82         */
  83
  84        char **env = prom_envp;
  85        int i = strlen(envname);
  86        int yamon = (*env && strchr(*env, '=') == NULL);
  87
  88        while (*env) {
  89                if (yamon) {
  90                        if (strcmp(envname, *env++) == 0)
  91                                return *env;
  92                } else {
  93                        if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
  94                                return *env + i + 1;
  95                }
  96                env++;
  97        }
  98        return NULL;
  99}
 100
 101inline unsigned char str2hexnum(unsigned char c)
 102{
 103        if(c >= '0' && c <= '9')
 104                return c - '0';
 105        if(c >= 'a' && c <= 'f')
 106                return c - 'a' + 10;
 107        if(c >= 'A' && c <= 'F')
 108                return c - 'A' + 10;
 109        return 0; /* foo */
 110}
 111
 112inline 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 get_ethernet_addr(char *ethernet_addr)
 128{
 129        char *ethaddr_str;
 130
 131        ethaddr_str = prom_getenv("ethaddr");
 132        if (!ethaddr_str) {
 133                printk("ethaddr not set in boot prom\n");
 134                return -1;
 135        }
 136        str2eaddr(ethernet_addr, ethaddr_str);
 137
 138#if 0
 139        {
 140                int i;
 141
 142        printk("get_ethernet_addr: ");
 143        for (i=0; i<5; i++)
 144                printk("%02x:", (unsigned char)*(ethernet_addr+i));
 145        printk("%02x\n", *(ethernet_addr+i));
 146        }
 147#endif
 148
 149        return 0;
 150}
 151
 152void __init prom_free_prom_memory(void)
 153{
 154}
 155
 156EXPORT_SYMBOL(prom_getcmdline);
 157EXPORT_SYMBOL(get_ethernet_addr);
 158EXPORT_SYMBOL(str2eaddr);
 159