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
  42 int prom_argc;
  43 char **prom_argv;
  44 char **prom_envp;
  45
  46 char * __init_or_module prom_getcmdline(void)
  47 {
  48         return &(arcs_cmdline[0]);
  49 }
  50
  51 void 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
  71 char *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
  94 static 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
 106 static 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
 121 int 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 }
 142 EXPORT_SYMBOL(prom_get_ethernet_addr);
 143
 144 void __init prom_free_prom_memory(void)
 145 {
 146 }