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 <malloc.h>
  31 #include <spi_flash.h>
  32
  33 #ifndef CONFIG_ENV_SPI_BUS
  34 # define CONFIG_ENV_SPI_BUS     0
  35 #endif
  36 #ifndef CONFIG_ENV_SPI_CS
  37 # define CONFIG_ENV_SPI_CS              0
  38 #endif
  39 #ifndef CONFIG_ENV_SPI_MAX_HZ
  40 # define CONFIG_ENV_SPI_MAX_HZ  1000000
  41 #endif
  42 #ifndef CONFIG_ENV_SPI_MODE
  43 # define CONFIG_ENV_SPI_MODE    SPI_MODE_3
  44 #endif
  45
  46 DECLARE_GLOBAL_DATA_PTR;
  47
  48 /* references to names in env_common.c */
  49 extern uchar default_environment[];
  50 extern int default_environment_size;
  51
  52 char * env_name_spec = "SPI Flash";
  53 env_t *env_ptr;
  54
  55 static struct spi_flash *env_flash;
  56
  57 uchar env_get_char_spec(int index)
  58 {
  59         return *((uchar *)(gd->env_addr + index));
  60 }
  61
  62 int saveenv(void)
  63 {
  64         u32 saved_size, saved_offset;
  65         char *saved_buffer = NULL;
  66         u32 sector = 1;
  67         int ret;
  68
  69         if (!env_flash) {
  70                 puts("Environment SPI flash not initialized\n");
  71                 return 1;
  72         }
  73
  74         /* Is the sector larger than the env (i.e. embedded) */
  75         if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
  76                 saved_size = CONFIG_ENV_SECT_SIZE - CONFIG_ENV_SIZE;
  77                 saved_offset = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
  78                 saved_buffer = malloc(saved_size);
  79                 if (!saved_buffer) {
  80                         ret = 1;
  81                         goto done;
  82                 }
  83                 ret = spi_flash_read(env_flash, saved_offset, saved_size, saved_buffer);
  84                 if (ret)
  85                         goto done;
  86         }
  87
  88         if (CONFIG_ENV_SIZE > CONFIG_ENV_SECT_SIZE) {
  89                 sector = CONFIG_ENV_SIZE / CONFIG_ENV_SECT_SIZE;
  90                 if (CONFIG_ENV_SIZE % CONFIG_ENV_SECT_SIZE)
  91                         sector++;
  92         }
  93
  94         puts("Erasing SPI flash...");
  95         ret = spi_flash_erase(env_flash, CONFIG_ENV_OFFSET, sector * CONFIG_ENV_SECT_SIZE);
  96         if (ret)
  97                 goto done;
  98
  99         puts("Writing to SPI flash...");
 100         ret = spi_flash_write(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr);
 101         if (ret)
 102                 goto done;
 103
 104         if (CONFIG_ENV_SECT_SIZE > CONFIG_ENV_SIZE) {
 105                 ret = spi_flash_write(env_flash, saved_offset, saved_size, saved_buffer);
 106                 if (ret)
 107                         goto done;
 108         }
 109
 110         ret = 0;
 111         puts("done\n");
 112
 113  done:
 114         if (saved_buffer)
 115                 free(saved_buffer);
 116         return ret;
 117 }
 118
 119 void env_relocate_spec(void)
 120 {
 121         int ret;
 122
 123         env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
 124                         CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
 125         if (!env_flash)
 126                 goto err_probe;
 127
 128         ret = spi_flash_read(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr);
 129         if (ret)
 130                 goto err_read;
 131
 132         if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
 133                 goto err_crc;
 134
 135         gd->env_valid = 1;
 136
 137         return;
 138
 139 err_read:
 140         spi_flash_free(env_flash);
 141         env_flash = NULL;
 142 err_probe:
 143 err_crc:
 144         puts("*** Warning - bad CRC, using default environment\n\n");
 145
 146         if (default_environment_size > CONFIG_ENV_SIZE) {
 147                 gd->env_valid = 0;
 148                 puts("*** Error - default environment is too large\n\n");
 149                 return;
 150         }
 151
 152         memset(env_ptr, 0, sizeof(env_t));
 153         memcpy(env_ptr->data, default_environment, default_environment_size);
 154         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
 155         gd->env_valid = 1;
 156 }
 157
 158 int env_init(void)
 159 {
 160         /* SPI flash isn't usable before relocation */
 161         gd->env_addr = (ulong)&default_environment[0];
 162         gd->env_valid = 1;
 163
 164         return 0;
 165 }