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/init.h>
  37 #include <linux/kernel.h>
  38 #include <linux/memblock.h>
  39 #include <linux/sizes.h>
  40 #include <linux/string.h>
  41
  42 #include <asm/bootinfo.h>
  43 #include <prom.h>
  44
  45 int prom_argc;
  46 char **prom_argv;
  47 char **prom_envp;
  48
  49 void __init prom_init_cmdline(void)
  50 {
  51         int i;
  52
  53         for (i = 1; i < prom_argc; i++) {
  54                 strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
  55                 if (i < (prom_argc - 1))
  56                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
  57         }
  58 }
  59
  60 char *prom_getenv(char *envname)
  61 {
  62         /*
  63          * Return a pointer to the given environment variable.
  64          * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
  65          */
  66
  67         char **env = prom_envp;
  68         int i = strlen(envname);
  69         int yamon = (*env && strchr(*env, '=') == NULL);
  70
  71         while (*env) {
  72                 if (yamon) {
  73                         if (strcmp(envname, *env++) == 0)
  74                                 return *env;
  75                 } else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
  76                         return *env + i + 1;
  77                 env++;
  78         }
  79
  80         return NULL;
  81 }
  82
  83 void __init prom_init(void)
  84 {
  85         unsigned char *memsize_str;
  86         unsigned long memsize;
  87
  88         prom_argc = (int)fw_arg0;
  89         prom_argv = (char **)fw_arg1;
  90         prom_envp = (char **)fw_arg2;
  91
  92         prom_init_cmdline();
  93
  94         memsize_str = prom_getenv("memsize");
  95         if (!memsize_str || kstrtoul(memsize_str, 0, &memsize))
  96                 memsize = SZ_64M; /* minimum memsize is 64MB RAM */
  97
  98         memblock_add(0, memsize);
  99 }
 100
 101 static 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
 110         return 0; /* foo */
 111 }
 112
 113 static inline void str2eaddr(unsigned char *ea, unsigned char *str)
 114 {
 115         int i;
 116
 117         for (i = 0; i < 6; i++) {
 118                 unsigned char num;
 119
 120                 if ((*str == '.') || (*str == ':'))
 121                         str++;
 122                 num  = str2hexnum(*str++) << 4;
 123                 num |= str2hexnum(*str++);
 124                 ea[i] = num;
 125         }
 126 }
 127
 128 int __init prom_get_ethernet_addr(char *ethernet_addr)
 129 {
 130         char *ethaddr_str;
 131
 132         /* Check the environment variables first */
 133         ethaddr_str = prom_getenv("ethaddr");
 134         if (!ethaddr_str) {
 135                 /* Check command line */
 136                 ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
 137                 if (!ethaddr_str)
 138                         return -1;
 139
 140                 ethaddr_str += strlen("ethaddr=");
 141         }
 142
 143         str2eaddr(ethernet_addr, ethaddr_str);
 144
 145         return 0;
 146 }