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