LXR uboot/common/env

   1/*
   2 * (C) Copyright 2000-2002
   3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4 *
   5 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6 * Andreas Heppel <aheppel@sysgo.de>
   7
   8 * See file CREDITS for list of people who contributed to this
   9 * project.
  10 *
  11 * This program is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU General Public License as
  13 * published by the Free Software Foundation; either version 2 of
  14 * the License, or (at your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with this program; if not, write to the Free Software
  23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24 * MA 02111-1307 USA
  25 */
  26
  27/*
  28 * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
  29 *
  30 * It might not be possible in all cases to use 'memcpy()' to copy
  31 * the environment to NVRAM, as the NVRAM might not be mapped into
  32 * the memory space. (I.e. this is the case for the BAB750). In those
  33 * cases it might be possible to access the NVRAM using a different
  34 * method. For example, the RTC on the BAB750 is accessible in IO
  35 * space using its address and data registers. To enable usage of
  36 * NVRAM in those cases I invented the functions 'nvram_read()' and
  37 * 'nvram_write()', which will be activated upon the configuration
  38 * #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
  39 * strongly dependent on the used HW, and must be redefined for each
  40 * board that wants to use them.
  41 */
  42
  43#include <common.h>
  44#include <command.h>
  45#include <environment.h>
  46#include <linux/stddef.h>
  47
  48DECLARE_GLOBAL_DATA_PTR;
  49
  50#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
  51extern void *nvram_read(void *dest, const long src, size_t count);
  52extern void nvram_write(long dest, const void *src, size_t count);
  53env_t *env_ptr = NULL;
  54#else
  55env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
  56#endif
  57
  58char * env_name_spec = "NVRAM";
  59
  60extern uchar default_environment[];
  61
  62#ifdef CONFIG_AMIGAONEG3SE
  63uchar env_get_char_spec (int index)
  64{
  65#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
  66        uchar c;
  67
  68        nvram_read(&c, CONFIG_ENV_ADDR+index, 1);
  69
  70        return c;
  71#else
  72        uchar retval;
  73        enable_nvram();
  74        retval = *((uchar *)(gd->env_addr + index));
  75        disable_nvram();
  76        return retval;
  77#endif
  78}
  79#else
  80uchar env_get_char_spec (int index)
  81{
  82#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
  83        uchar c;
  84
  85        nvram_read(&c, CONFIG_ENV_ADDR+index, 1);
  86
  87        return c;
  88#else
  89        return *((uchar *)(gd->env_addr + index));
  90#endif
  91}
  92#endif
  93
  94void env_relocate_spec (void)
  95{
  96#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
  97        nvram_read(env_ptr, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
  98#else
  99        memcpy (env_ptr, (void*)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
 100#endif
 101}
 102
 103int saveenv (void)
 104{
 105        int rcode = 0;
 106#ifdef CONFIG_AMIGAONEG3SE
 107        enable_nvram();
 108#endif
 109#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
 110        nvram_write(CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE);
 111#else
 112        if (memcpy ((char *)CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE) == NULL)
 113                    rcode = 1 ;
 114#endif
 115#ifdef CONFIG_AMIGAONEG3SE
 116        udelay(10000);
 117        disable_nvram();
 118#endif
 119        return rcode;
 120}
 121
 122
 123/************************************************************************
 124 * Initialize Environment use
 125 *
 126 * We are still running from ROM, so data use is limited
 127 */
 128int env_init (void)
 129{
 130#ifdef CONFIG_AMIGAONEG3SE
 131        enable_nvram();
 132#endif
 133#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
 134        ulong crc;
 135        uchar data[ENV_SIZE];
 136        nvram_read (&crc, CONFIG_ENV_ADDR, sizeof(ulong));
 137        nvram_read (data, CONFIG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
 138
 139        if (crc32(0, data, ENV_SIZE) == crc) {
 140                gd->env_addr  = (ulong)CONFIG_ENV_ADDR + sizeof(long);
 141#else
 142        if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 143                gd->env_addr  = (ulong)&(env_ptr->data);
 144#endif
 145                gd->env_valid = 1;
 146        } else {
 147                gd->env_addr  = (ulong)&default_environment[0];
 148                gd->env_valid = 0;
 149        }
 150#ifdef CONFIG_AMIGAONEG3SE
 151        disable_nvram();
 152#endif
 153        return (0);
 154}
 155