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