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
  44 int prom_argc;
  45 char **prom_argv;
  46 char **prom_envp;
  47
  48 void __init prom_init_cmdline(void)
  49 {
  50         int i;
  51
  52         for (i = 1; i < prom_argc; i++) {
  53                 strlcat(arcs_cmdline, prom_argv[i], COMMAND_LINE_SIZE);
  54                 if (i < (prom_argc - 1))
  55                         strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
  56         }
  57 }
  58
  59 char *prom_getenv(char *envname)
  60 {
  61         /*
  62          * Return a pointer to the given environment variable.
  63          * YAMON uses "name", "value" pairs, while U-Boot uses "name=value".
  64          */
  65
  66         char **env = prom_envp;
  67         int i = strlen(envname);
  68         int yamon = (*env && strchr(*env, '=') == NULL);
  69
  70         while (*env) {
  71                 if (yamon) {
  72                         if (strcmp(envname, *env++) == 0)
  73                                 return *env;
  74                 } else if (strncmp(envname, *env, i) == 0 && (*env)[i] == '=')
  75                         return *env + i + 1;
  76                 env++;
  77         }
  78
  79         return NULL;
  80 }
  81
  82 void __init prom_init(void)
  83 {
  84         unsigned char *memsize_str;
  85         unsigned long memsize;
  86
  87         prom_argc = (int)fw_arg0;
  88         prom_argv = (char **)fw_arg1;
  89         prom_envp = (char **)fw_arg2;
  90
  91         prom_init_cmdline();
  92
  93         memsize_str = prom_getenv("memsize");
  94         if (!memsize_str || kstrtoul(memsize_str, 0, &memsize))
  95                 memsize = SZ_64M; /* minimum memsize is 64MB RAM */
  96
  97         memblock_add(0, memsize);
  98 }
  99
 100 static inline unsigned char str2hexnum(unsigned char c)
 101 {
 102         if (c >= '0' && c <= '9')
 103                 return c - '0';
 104         if (c >= 'a' && c <= 'f')
 105                 return c - 'a' + 10;
 106         if (c >= 'A' && c <= 'F')
 107                 return c - 'A' + 10;
 108
 109         return 0; /* foo */
 110 }
 111
 112 static 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 __init prom_get_ethernet_addr(char *ethernet_addr)
 128 {
 129         char *ethaddr_str;
 130
 131         /* Check the environment variables first */
 132         ethaddr_str = prom_getenv("ethaddr");
 133         if (!ethaddr_str) {
 134                 /* Check command line */
 135                 ethaddr_str = strstr(arcs_cmdline, "ethaddr=");
 136                 if (!ethaddr_str)
 137                         return -1;
 138
 139                 ethaddr_str += strlen("ethaddr=");
 140         }
 141
 142         str2eaddr(ethernet_addr, ethaddr_str);
 143
 144         return 0;
 145 }
 146
 147 void __init prom_free_prom_memory(void)
 148 {
 149 }