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 #ifdef CONFIG_ENV_ADDR_FLEX
  64         struct onenand_chip *this = &onenand_chip;
  65 #endif
  66         loff_t env_addr;
  67         int use_default = 0;
  68         size_t retlen;
  69
  70         env_addr = CONFIG_ENV_ADDR;
  71 #ifdef CONFIG_ENV_ADDR_FLEX
  72         if (FLEXONENAND(this))
  73                 env_addr = CONFIG_ENV_ADDR_FLEX;
  74 #endif
  75         /* Check OneNAND exist */
  76         if (mtd->writesize)
  77                 /* Ignore read fail */
  78                 mtd->read(mtd, env_addr, ONENAND_MAX_ENV_SIZE,
  79                              &retlen, (u_char *) env_ptr);
  80         else
  81                 mtd->writesize = MAX_ONENAND_PAGESIZE;
  82
  83         if (crc32(0, env_ptr->data, ONENAND_ENV_SIZE(mtd)) != env_ptr->crc)
  84                 use_default = 1;
  85
  86         if (use_default) {
  87                 memcpy(env_ptr->data, default_environment,
  88                        ONENAND_ENV_SIZE(mtd));
  89                 env_ptr->crc =
  90                     crc32(0, env_ptr->data, ONENAND_ENV_SIZE(mtd));
  91         }
  92
  93         gd->env_addr = (ulong) & env_ptr->data;
  94         gd->env_valid = 1;
  95 }
  96
  97 int saveenv(void)
  98 {
  99         struct mtd_info *mtd = &onenand_mtd;
 100 #ifdef CONFIG_ENV_ADDR_FLEX
 101         struct onenand_chip *this = &onenand_chip;
 102 #endif
 103         loff_t env_addr = CONFIG_ENV_ADDR;
 104         struct erase_info instr = {
 105                 .callback       = NULL,
 106         };
 107         size_t retlen;
 108
 109         instr.len = CONFIG_ENV_SIZE;
 110 #ifdef CONFIG_ENV_ADDR_FLEX
 111         if (FLEXONENAND(this)) {
 112                 env_addr = CONFIG_ENV_ADDR_FLEX;
 113                 instr.len = CONFIG_ENV_SIZE_FLEX;
 114                 instr.len <<= onenand_mtd.eraseregions[0].numblocks == 1 ?
 115                                 1 : 0;
 116         }
 117 #endif
 118         instr.addr = env_addr;
 119         instr.mtd = mtd;
 120         if (mtd->erase(mtd, &instr)) {
 121                 printf("OneNAND: erase failed at 0x%08llx\n", env_addr);
 122                 return 1;
 123         }
 124
 125         /* update crc */
 126         env_ptr->crc = crc32(0, env_ptr->data, ONENAND_ENV_SIZE(mtd));
 127
 128         if (mtd->write(mtd, env_addr, ONENAND_MAX_ENV_SIZE, &retlen,
 129              (u_char *) env_ptr)) {
 130                 printf("OneNAND: write failed at 0x%llx\n", instr.addr);
 131                 return 2;
 132         }
 133
 134         return 0;
 135 }
 136
 137 int env_init(void)
 138 {
 139         /* use default */
 140         gd->env_addr = (ulong) & default_environment[0];
 141         gd->env_valid = 1;
 142
 143         return 0;
 144 }