common/env_nand.c

   1 /*
   2  * (C) Copyright 2004
   3  * Jian Zhang, Texas Instruments, jzhang@ti.com.
   4
   5  * (C) Copyright 2000-2004
   6  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7  *
   8  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   9  * Andreas Heppel <aheppel@sysgo.de>
  10
  11  * See file CREDITS for list of people who contributed to this
  12  * project.
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License as
  16  * published by the Free Software Foundation; either version 2 of
  17  * the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27  * MA 02111-1307 USA
  28  */
  29
  30 /* #define DEBUG */
  31
  32 #include <common.h>
  33
  34 #if defined(CFG_ENV_IS_IN_NAND) /* Environment is in Nand Flash */
  35
  36 #include <command.h>
  37 #include <environment.h>
  38 #include <linux/stddef.h>
  39 #include <nand.h>
  40
  41 #if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_CMD_NAND))
  42 #define CMD_SAVEENV
  43 #endif
  44
  45 #if defined(CFG_ENV_SIZE_REDUND)
  46 #error CFG_ENV_SIZE_REDUND  not supported yet
  47 #endif
  48
  49 #if defined(CFG_ENV_ADDR_REDUND)
  50 #error CFG_ENV_ADDR_REDUND and CFG_ENV_IS_IN_NAND not supported yet
  51 #endif
  52
  53
  54 #ifdef CONFIG_INFERNO
  55 #error CONFIG_INFERNO not supported yet
  56 #endif
  57
  58 int nand_legacy_rw (struct nand_chip* nand, int cmd,
  59             size_t start, size_t len,
  60             size_t * retlen, u_char * buf);
  61
  62 /* info for NAND chips, defined in drivers/nand/nand.c */
  63 extern nand_info_t nand_info[];
  64
  65 /* references to names in env_common.c */
  66 extern uchar default_environment[];
  67 extern int default_environment_size;
  68
  69 char * env_name_spec = "NAND";
  70
  71
  72 #ifdef ENV_IS_EMBEDDED
  73 extern uchar environment[];
  74 env_t *env_ptr = (env_t *)(&environment[0]);
  75 #else /* ! ENV_IS_EMBEDDED */
  76 env_t *env_ptr = 0;
  77 #endif /* ENV_IS_EMBEDDED */
  78
  79
  80 /* local functions */
  81 static void use_default(void);
  82
  83
  84 uchar env_get_char_spec (int index)
  85 {
  86         DECLARE_GLOBAL_DATA_PTR;
  87
  88         return ( *((uchar *)(gd->env_addr + index)) );
  89 }
  90
  91
  92 /* this is called before nand_init()
  93  * so we can't read Nand to validate env data.
  94  * Mark it OK for now. env_relocate() in env_common.c
  95  * will call our relocate function which will does
  96  * the real validation.
  97  */
  98 int env_init(void)
  99 {
 100         DECLARE_GLOBAL_DATA_PTR;
 101
 102         gd->env_addr  = (ulong)&default_environment[0];
 103         gd->env_valid = 1;
 104
 105         return (0);
 106 }
 107
 108 #ifdef CMD_SAVEENV
 109 /*
 110  * The legacy NAND code saved the environment in the first NAND device i.e.,
 111  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 112  */
 113 int saveenv(void)
 114 {
 115         ulong total;
 116         int ret = 0;
 117
 118         puts ("Erasing Nand...");
 119         if (nand_erase(&nand_info[0], CFG_ENV_OFFSET, CFG_ENV_SIZE))
 120                 return 1;
 121
 122         puts ("Writing to Nand... ");
 123         total = CFG_ENV_SIZE;
 124         ret = nand_write(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
 125         if (ret || total != CFG_ENV_SIZE)
 126                 return 1;
 127
 128         puts ("done\n");
 129         return ret;
 130 }
 131 #endif /* CMD_SAVEENV */
 132
 133
 134 /*
 135  * The legacy NAND code saved the environment in the first NAND device i.e.,
 136  * nand_dev_desc + 0. This is also the behaviour using the new NAND code.
 137  */
 138 void env_relocate_spec (void)
 139 {
 140 #if !defined(ENV_IS_EMBEDDED)
 141         ulong total;
 142         int ret;
 143
 144         total = CFG_ENV_SIZE;
 145         ret = nand_read(&nand_info[0], CFG_ENV_OFFSET, &total, (u_char*)env_ptr);
 146         if (ret || total != CFG_ENV_SIZE)
 147                 return use_default();
 148
 149         if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
 150                 return use_default();
 151 #endif /* ! ENV_IS_EMBEDDED */
 152
 153 }
 154
 155 static void use_default()
 156 {
 157         DECLARE_GLOBAL_DATA_PTR;
 158
 159         puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
 160
 161         if (default_environment_size > CFG_ENV_SIZE){
 162                 puts ("*** Error - default environment is too large\n\n");
 163                 return;
 164         }
 165
 166         memset (env_ptr, 0, sizeof(env_t));
 167         memcpy (env_ptr->data,
 168                         default_environment,
 169                         default_environment_size);
 170         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
 171         gd->env_valid = 1;
 172
 173 }
 174
 175 #endif /* CFG_ENV_IS_IN_NAND */