common/env_onenand.c

   1 /*
   2  * (C) Copyright 2005-2009 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 #include <command.h>
  26 #include <environment.h>
  27 #include <linux/stddef.h>
  28 #include <malloc.h>
  29
  30 #include <linux/mtd/compat.h>
  31 #include <linux/mtd/mtd.h>
  32 #include <linux/mtd/onenand.h>
  33
  34 extern struct mtd_info onenand_mtd;
  35 extern struct onenand_chip onenand_chip;
  36
  37 /* References to names in env_common.c */
  38 extern uchar default_environment[];
  39
  40 char *env_name_spec = "OneNAND";
  41
  42 #define ONENAND_MAX_ENV_SIZE    4096
  43 #define ONENAND_ENV_SIZE(mtd)   (ONENAND_MAX_ENV_SIZE - ENV_HEADER_SIZE)
  44
  45 #ifdef ENV_IS_EMBEDDED
  46 extern uchar environment[];
  47 env_t *env_ptr = (env_t *) (&environment[0]);
  48 #else /* ! ENV_IS_EMBEDDED */
  49 static unsigned char onenand_env[ONENAND_MAX_ENV_SIZE];
  50 env_t *env_ptr = (env_t *) onenand_env;
  51 #endif /* ENV_IS_EMBEDDED */
  52
  53 DECLARE_GLOBAL_DATA_PTR;
  54
  55 uchar env_get_char_spec(int index)
  56 {
  57         return (*((uchar *) (gd->env_addr + index)));
  58 }
  59
  60 void env_relocate_spec(void)
  61 {
  62         struct mtd_info *mtd = &onenand_mtd;
  63         loff_t env_addr;
  64         int use_default = 0;
  65         size_t retlen;
  66
  67         env_addr = CONFIG_ENV_ADDR;
  68
  69         /* Check OneNAND exist */
  70         if (mtd->writesize)
  71                 /* Ignore read fail */
  72                 mtd->read(mtd, env_addr, ONENAND_MAX_ENV_SIZE,
  73                              &retlen, (u_char *) env_ptr);
  74         else
  75                 mtd->writesize = MAX_ONENAND_PAGESIZE;
  76
  77         if (crc32(0, env_ptr->data, ONENAND_ENV_SIZE(mtd)) != env_ptr->crc)
  78                 use_default = 1;
  79
  80         if (use_default) {
  81                 memcpy(env_ptr->data, default_environment,
  82                        ONENAND_ENV_SIZE(mtd));
  83                 env_ptr->crc =
  84                     crc32(0, env_ptr->data, ONENAND_ENV_SIZE(mtd));
  85         }
  86
  87         gd->env_addr = (ulong) & env_ptr->data;
  88         gd->env_valid = 1;
  89 }
  90
  91 int saveenv(void)
  92 {
  93         struct mtd_info *mtd = &onenand_mtd;
  94         loff_t env_addr = CONFIG_ENV_ADDR;
  95         struct erase_info instr = {
  96                 .callback       = NULL,
  97         };
  98         size_t retlen;
  99
 100         instr.len = CONFIG_ENV_SIZE;
 101         instr.addr = env_addr;
 102         instr.mtd = mtd;
 103         if (mtd->erase(mtd, &instr)) {
 104                 printf("OneNAND: erase failed at 0x%08lx\n", env_addr);
 105                 return 1;
 106         }
 107
 108         /* update crc */
 109         env_ptr->crc = crc32(0, env_ptr->data, ONENAND_ENV_SIZE(mtd));
 110
 111         if (mtd->write(mtd, env_addr, ONENAND_MAX_ENV_SIZE, &retlen,
 112              (u_char *) env_ptr)) {
 113                 printf("OneNAND: write failed at 0x%llx\n", instr.addr);
 114                 return 2;
 115         }
 116
 117         return 0;
 118 }
 119
 120 int env_init(void)
 121 {
 122         /* use default */
 123         gd->env_addr = (ulong) & default_environment[0];
 124         gd->env_valid = 1;
 125
 126         return 0;
 127 }