common/env_onenand.c

   1 /*
   2  * (C) Copyright 2005-2007 Samsung Electronics
   3  * Kyungmin Park <kyungmin.park@samsung.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25
  26 #if defined(CFG_ENV_IS_IN_ONENAND)      /* Environment is in OneNAND */
  27
  28 #include <command.h>
  29 #include <environment.h>
  30 #include <linux/stddef.h>
  31 #include <malloc.h>
  32
  33 #include <linux/mtd/compat.h>
  34 #include <linux/mtd/mtd.h>
  35 #include <linux/mtd/onenand.h>
  36
  37 extern struct mtd_info onenand_mtd;
  38 extern struct onenand_chip onenand_chip;
  39
  40 /* References to names in env_common.c */
  41 extern uchar default_environment[];
  42
  43 #define ONENAND_ENV_SIZE(mtd)   (mtd.oobblock - ENV_HEADER_SIZE)
  44
  45 char *env_name_spec = "OneNAND";
  46
  47 #ifdef ENV_IS_EMBEDDED
  48 extern uchar environment[];
  49 env_t *env_ptr = (env_t *) (&environment[0]);
  50 #else /* ! ENV_IS_EMBEDDED */
  51 static unsigned char onenand_env[MAX_ONENAND_PAGESIZE];
  52 env_t *env_ptr = (env_t *) onenand_env;
  53 #endif /* ENV_IS_EMBEDDED */
  54
  55 uchar env_get_char_spec(int index)
  56 {
  57         DECLARE_GLOBAL_DATA_PTR;
  58
  59         return (*((uchar *) (gd->env_addr + index)));
  60 }
  61
  62 void env_relocate_spec(void)
  63 {
  64         DECLARE_GLOBAL_DATA_PTR;
  65         unsigned long env_addr;
  66         int use_default = 0;
  67         size_t retlen;
  68
  69         env_addr = CFG_ENV_ADDR;
  70         env_addr -= (unsigned long)onenand_chip.base;
  71
  72         /* Check OneNAND exist */
  73         if (onenand_mtd.oobblock)
  74                 /* Ignore read fail */
  75                 onenand_read(&onenand_mtd, env_addr, onenand_mtd.oobblock,
  76                              &retlen, (u_char *) env_ptr);
  77         else
  78                 onenand_mtd.oobblock = MAX_ONENAND_PAGESIZE;
  79
  80         if (crc32(0, env_ptr->data, ONENAND_ENV_SIZE(onenand_mtd)) !=
  81             env_ptr->crc)
  82                 use_default = 1;
  83
  84         if (use_default) {
  85                 memcpy(env_ptr->data, default_environment,
  86                        ONENAND_ENV_SIZE(onenand_mtd));
  87                 env_ptr->crc =
  88                     crc32(0, env_ptr->data, ONENAND_ENV_SIZE(onenand_mtd));
  89         }
  90
  91         gd->env_addr = (ulong) & env_ptr->data;
  92         gd->env_valid = 1;
  93 }
  94
  95 int saveenv(void)
  96 {
  97         unsigned long env_addr = CFG_ENV_ADDR;
  98         struct erase_info instr;
  99         size_t retlen;
 100
 101         instr.len = CFG_ENV_SIZE;
 102         instr.addr = env_addr;
 103         instr.addr -= (unsigned long)onenand_chip.base;
 104         if (onenand_erase(&onenand_mtd, &instr)) {
 105                 printf("OneNAND: erase failed at 0x%08x\n", env_addr);
 106                 return 1;
 107         }
 108
 109         /* update crc */
 110         env_ptr->crc =
 111             crc32(0, env_ptr->data, onenand_mtd.oobblock - ENV_HEADER_SIZE);
 112
 113         env_addr -= (unsigned long)onenand_chip.base;
 114         if (onenand_write(&onenand_mtd, env_addr, onenand_mtd.oobblock, &retlen,
 115              (u_char *) env_ptr)) {
 116                 printf("OneNAND: write failed at 0x%08x\n", instr.addr);
 117                 return 2;
 118         }
 119
 120         return 0;
 121 }
 122
 123 int env_init(void)
 124 {
 125         DECLARE_GLOBAL_DATA_PTR;
 126
 127         /* use default */
 128         gd->env_addr = (ulong) & default_environment[0];
 129         gd->env_valid = 1;
 130
 131         return 0;
 132 }
 133
 134 #endif /* CFG_ENV_IS_IN_ONENAND */