135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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*
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* (C) Copyright 2008 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <environment.h>
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#include <spi_flash.h>
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#ifndef CONFIG_ENV_SPI_BUS
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# define CONFIG_ENV_SPI_BUS 0
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#endif
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#ifndef CONFIG_ENV_SPI_CS
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# define CONFIG_ENV_SPI_CS 0
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#endif
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#ifndef CONFIG_ENV_SPI_MAX_HZ
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# define CONFIG_ENV_SPI_MAX_HZ 1000000
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#endif
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#ifndef CONFIG_ENV_SPI_MODE
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# define CONFIG_ENV_SPI_MODE SPI_MODE_3
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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/* references to names in env_common.c */
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extern uchar default_environment[];
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extern int default_environment_size;
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char * env_name_spec = "SPI Flash";
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env_t *env_ptr;
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static struct spi_flash *env_flash;
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uchar env_get_char_spec(int index)
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{
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return *((uchar *)(gd->env_addr + index));
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}
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int saveenv(void)
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{
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u32 sector = 1;
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if (!env_flash) {
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puts("Environment SPI flash not initialized\n");
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return 1;
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}
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if (CONFIG_ENV_SIZE > CONFIG_ENV_SECT_SIZE) {
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sector = CONFIG_ENV_SIZE / CONFIG_ENV_SECT_SIZE;
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if (CONFIG_ENV_SIZE % CONFIG_ENV_SECT_SIZE)
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sector++;
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}
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puts("Erasing SPI flash...");
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if (spi_flash_erase(env_flash, CONFIG_ENV_OFFSET, sector * CONFIG_ENV_SECT_SIZE))
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return 1;
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puts("Writing to SPI flash...");
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if (spi_flash_write(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr))
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return 1;
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puts("done\n");
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return 0;
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}
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void env_relocate_spec(void)
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{
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int ret;
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env_flash = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
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CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
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if (!env_flash)
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goto err_probe;
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ret = spi_flash_read(env_flash, CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE, env_ptr);
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if (ret)
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goto err_read;
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if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)
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goto err_crc;
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gd->env_valid = 1;
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return;
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err_read:
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spi_flash_free(env_flash);
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env_flash = NULL;
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err_probe:
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err_crc:
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puts("*** Warning - bad CRC, using default environment\n\n");
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if (default_environment_size > CONFIG_ENV_SIZE) {
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gd->env_valid = 0;
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puts("*** Error - default environment is too large\n\n");
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return;
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}
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memset(env_ptr, 0, sizeof(env_t));
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memcpy(env_ptr->data, default_environment, default_environment_size);
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env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
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gd->env_valid = 1;
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}
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int env_init(void)
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{
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/* SPI flash isn't usable before relocation */
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 1;
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return 0;
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}
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