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