release/src-rt-6.x/linux/linux-2.6/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
  46 extern int prom_argc;
  47 extern char **prom_argv, **prom_envp;
  48
  49
  50 char * __init_or_module prom_getcmdline(void)
  51 {
  52         return &(arcs_cmdline[0]);
  53 }
  54
  55 void  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
  77 char *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
 101 inline 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
 112 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
 127 int 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
 152 void __init prom_free_prom_memory(void)
 153 {
 154 }
 155
 156 EXPORT_SYMBOL(prom_getcmdline);
 157 EXPORT_SYMBOL(get_ethernet_addr);
 158 EXPORT_SYMBOL(str2eaddr);