common/env_sf.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   7  *
   8  * (C) Copyright 2008 Atmel Corporation
   9  *
  10  * See file CREDITS for list of people who contributed to this
  11  * project.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License as
  15  * published by the Free Software Foundation; either version 2 of
  16  * the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  26  * MA 02111-1307 USA
  27  */
  28 #include <common.h>
  29 #include <environment.h>
  30 #include <spi_flash.h>
  31
  32 #ifndef CFG_ENV_SPI_BUS
  33 # define CFG_ENV_SPI_BUS        0
  34 #endif
  35 #ifndef CFG_ENV_SPI_CS
  36 # define CFG_ENV_SPI_CS         0
  37 #endif
  38 #ifndef CFG_ENV_SPI_MAX_HZ
  39 # define CFG_ENV_SPI_MAX_HZ     1000000
  40 #endif
  41 #ifndef CFG_ENV_SPI_MODE
  42 # define CFG_ENV_SPI_MODE       SPI_MODE_3
  43 #endif
  44
  45 DECLARE_GLOBAL_DATA_PTR;
  46
  47 /* references to names in env_common.c */
  48 extern uchar default_environment[];
  49 extern int default_environment_size;
  50
  51 char * env_name_spec = "SPI Flash";
  52 env_t *env_ptr;
  53
  54 static struct spi_flash *env_flash;
  55
  56 uchar env_get_char_spec(int index)
  57 {
  58         return *((uchar *)(gd->env_addr + index));
  59 }
  60
  61 int saveenv(void)
  62 {
  63         u32 sector = 1;
  64
  65         if (!env_flash) {
  66                 puts("Environment SPI flash not initialized\n");
  67                 return 1;
  68         }
  69
  70         if (CFG_ENV_SIZE > CFG_ENV_SECT_SIZE) {
  71                 sector = CFG_ENV_SIZE / CFG_ENV_SECT_SIZE;
  72                 if (CFG_ENV_SIZE % CFG_ENV_SECT_SIZE)
  73                         sector++;
  74         }
  75
  76         puts("Erasing SPI flash...");
  77         if (spi_flash_erase(env_flash, CFG_ENV_OFFSET, sector * CFG_ENV_SECT_SIZE))
  78                 return 1;
  79
  80         puts("Writing to SPI flash...");
  81         if (spi_flash_write(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE, env_ptr))
  82                 return 1;
  83
  84         puts("done\n");
  85         return 0;
  86 }
  87
  88 void env_relocate_spec(void)
  89 {
  90         int ret;
  91
  92         env_flash = spi_flash_probe(CFG_ENV_SPI_BUS, CFG_ENV_SPI_CS,
  93                         CFG_ENV_SPI_MAX_HZ, CFG_ENV_SPI_MODE);
  94         if (!env_flash)
  95                 goto err_probe;
  96
  97         ret = spi_flash_read(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE, env_ptr);
  98         if (ret)
  99                 goto err_read;
 100
 101         if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
 102                 goto err_crc;
 103
 104         gd->env_valid = 1;
 105
 106         return;
 107
 108 err_read:
 109         spi_flash_free(env_flash);
 110         env_flash = NULL;
 111 err_probe:
 112 err_crc:
 113         puts("*** Warning - bad CRC, using default environment\n\n");
 114
 115         if (default_environment_size > CFG_ENV_SIZE) {
 116                 gd->env_valid = 0;
 117                 puts("*** Error - default environment is too large\n\n");
 118                 return;
 119         }
 120
 121         memset(env_ptr, 0, sizeof(env_t));
 122         memcpy(env_ptr->data, default_environment, default_environment_size);
 123         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
 124         gd->env_valid = 1;
 125 }
 126
 127 int env_init(void)
 128 {
 129         /* SPI flash isn't usable before relocation */
 130         gd->env_addr = (ulong)&default_environment[0];
 131         gd->env_valid = 1;
 132
 133         return 0;
 134 }