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 #include <linux/module.h>
  37 #include <linux/kernel.h>
  38 #include <linux/init.h>
  39 #include <linux/string.h>
  40
  41 #include <asm/bootinfo.h>
  42
  43 int prom_argc;
  44 char **prom_argv;
  45 char **prom_envp;
  46
  47 char * __init_or_module prom_getcmdline(void)
  48 {
  49         return &(arcs_cmdline[0]);
  50 }
  51
  52 void prom_init_cmdline(void)
  53 {
  54         char *cp;
  55         int actr;
  56
  57         actr = 1; /* Always ignore argv[0] */
  58
  59         cp = &(arcs_cmdline[0]);
  60         while(actr < prom_argc) {
  61                 strcpy(cp, prom_argv[actr]);
  62                 cp += strlen(prom_argv[actr]);
  63                 *cp++ = ' ';
  64                 actr++;
  65         }
  66         if (cp != &(arcs_cmdline[0])) /* get rid of trailing space */
  67                 --cp;
  68         if (prom_argc > 1)
  69                 *cp = '\0';
  70 }
  71
  72 char *prom_getenv(char *envname)
  73 {
  74         /*
  75          * Return a pointer to the given environment variable.
  76          * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
  77          */
  78
  79         char **env = prom_envp;
  80         int i = strlen(envname);
  81         int yamon = (*env && strchr(*env, '=') == NULL);
  82
  83         while (*env) {
  84                 if (yamon) {
  85                         if (strcmp(envname, *env++) == 0)
  86                                 return *env;
  87                 } else {
  88                         if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
  89                                 return *env + i + 1;
  90                 }
  91                 env++;
  92         }
  93
  94         return NULL;
  95 }
  96
  97 static inline unsigned char str2hexnum(unsigned char c)
  98 {
  99         if (c >= '0' && c <= '9')
 100                 return c - '0';
 101         if (c >= 'a' && c <= 'f')
 102                 return c - 'a' + 10;
 103         if (c >= 'A' && c <= 'F')
 104                 return c - 'A' + 10;
 105
 106         return 0; /* foo */
 107 }
 108
 109 static inline void str2eaddr(unsigned char *ea, unsigned char *str)
 110 {
 111         int i;
 112
 113         for(i = 0; i < 6; i++) {
 114                 unsigned char num;
 115
 116                 if((*str == '.') || (*str == ':'))
 117                         str++;
 118                 num = str2hexnum(*str++) << 4;
 119                 num |= (str2hexnum(*str++));
 120                 ea[i] = num;
 121         }
 122 }
 123
 124 int prom_get_ethernet_addr(char *ethernet_addr)
 125 {
 126         char *ethaddr_str;
 127         char *argptr;
 128
 129         /* Check the environment variables first */
 130         ethaddr_str = prom_getenv("ethaddr");
 131         if (!ethaddr_str) {
 132                 /* Check command line */
 133                 argptr = prom_getcmdline();
 134                 ethaddr_str = strstr(argptr, "ethaddr=");
 135                 if (!ethaddr_str)
 136                         return -1;
 137
 138                 ethaddr_str += strlen("ethaddr=");
 139         }
 140
 141         str2eaddr(ethernet_addr, ethaddr_str);
 142
 143         return 0;
 144 }
 145 EXPORT_SYMBOL(prom_get_ethernet_addr);
 146
 147 void __init prom_free_prom_memory(void)
 148 {
 149 }