common/env_nvram.c

   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 CFG_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
  45 #ifdef CFG_ENV_IS_IN_NVRAM /* Environment is in NVRAM */
  46
  47 #include <command.h>
  48 #include <environment.h>
  49 #include <linux/stddef.h>
  50
  51 #ifdef CFG_NVRAM_ACCESS_ROUTINE
  52 extern void *nvram_read(void *dest, const long src, size_t count);
  53 extern void nvram_write(long dest, const void *src, size_t count);
  54 env_t *env_ptr = NULL;
  55 #else
  56 env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
  57 #endif
  58
  59 char * env_name_spec = "NVRAM";
  60
  61 extern uchar default_environment[];
  62 extern int default_environment_size;
  63
  64 extern uchar (*env_get_char)(int);
  65 extern uchar env_get_char_memory (int index);
  66
  67 #ifdef CONFIG_AMIGAONEG3SE
  68 uchar env_get_char_spec (int index)
  69 {
  70 #ifdef CFG_NVRAM_ACCESS_ROUTINE
  71         uchar c;
  72
  73         nvram_read(&c, CFG_ENV_ADDR+index, 1);
  74
  75         return c;
  76 #else
  77         DECLARE_GLOBAL_DATA_PTR;
  78         uchar retval;
  79         enable_nvram();
  80         retval = *((uchar *)(gd->env_addr + index));
  81         disable_nvram();
  82         return retval;
  83 #endif
  84 }
  85 #else
  86 uchar env_get_char_spec (int index)
  87 {
  88 #ifdef CFG_NVRAM_ACCESS_ROUTINE
  89         uchar c;
  90
  91         nvram_read(&c, CFG_ENV_ADDR+index, 1);
  92
  93         return c;
  94 #else
  95         DECLARE_GLOBAL_DATA_PTR;
  96
  97         return *((uchar *)(gd->env_addr + index));
  98 #endif
  99 }
 100 #endif
 101
 102 void env_relocate_spec (void)
 103 {
 104 #if defined(CFG_NVRAM_ACCESS_ROUTINE)
 105         nvram_read(env_ptr, CFG_ENV_ADDR, CFG_ENV_SIZE);
 106 #else
 107         memcpy (env_ptr, (void*)CFG_ENV_ADDR, CFG_ENV_SIZE);
 108 #endif
 109 }
 110
 111 int saveenv (void)
 112 {
 113         int rcode = 0;
 114 #ifdef CONFIG_AMIGAONEG3SE
 115         enable_nvram();
 116 #endif
 117 #ifdef CFG_NVRAM_ACCESS_ROUTINE
 118         nvram_write(CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE);
 119 #else
 120         if (memcpy ((char *)CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE) == NULL)
 121                     rcode = 1 ;
 122 #endif
 123 #ifdef CONFIG_AMIGAONEG3SE
 124         udelay(10000);
 125         disable_nvram();
 126 #endif
 127         return rcode;
 128 }
 129
 130
 131 /************************************************************************
 132  * Initialize Environment use
 133  *
 134  * We are still running from ROM, so data use is limited
 135  */
 136 int env_init (void)
 137 {
 138         DECLARE_GLOBAL_DATA_PTR;
 139 #ifdef CONFIG_AMIGAONEG3SE
 140         enable_nvram();
 141 #endif
 142 #if defined(CFG_NVRAM_ACCESS_ROUTINE)
 143         ulong crc;
 144         uchar data[ENV_SIZE];
 145         nvram_read (&crc, CFG_ENV_ADDR, sizeof(ulong));
 146         nvram_read (data, CFG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
 147
 148         if (crc32(0, data, ENV_SIZE) == crc) {
 149                 gd->env_addr  = (ulong)CFG_ENV_ADDR + sizeof(long);
 150 #else
 151         if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
 152                 gd->env_addr  = (ulong)&(env_ptr->data);
 153 #endif
 154                 gd->env_valid = 1;
 155         } else {
 156                 gd->env_addr  = (ulong)&default_environment[0];
 157                 gd->env_valid = 0;
 158         }
 159 #ifdef CONFIG_AMIGAONEG3SE
 160         disable_nvram();
 161 #endif
 162         return (0);
 163 }
 164
 165 #endif /* CFG_ENV_IS_IN_NVRAM */