diff options
Diffstat (limited to 'common/env_sf.c')
| -rw-r--r-- | common/env_sf.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/common/env_sf.c b/common/env_sf.c new file mode 100644 index 0000000..d641a9a --- /dev/null +++ b/common/env_sf.c @@ -0,0 +1,131 @@ +/* + * (C) Copyright 2000-2002 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Andreas Heppel <aheppel@sysgo.de> + * + * (C) Copyright 2008 Atmel Corporation + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ +#include <common.h> + +#ifdef CFG_ENV_IS_IN_SPI_FLASH + +#include <environment.h> +#include <spi_flash.h> + +#ifndef CFG_ENV_SPI_BUS +# define CFG_ENV_SPI_BUS 0 +#endif +#ifndef CFG_ENV_SPI_CS +# define CFG_ENV_SPI_CS 0 +#endif +#ifndef CFG_ENV_SPI_MAX_HZ +# define CFG_ENV_SPI_MAX_HZ 1000000 +#endif +#ifndef CFG_ENV_SPI_MODE +# define CFG_ENV_SPI_MODE SPI_MODE_3 +#endif + +DECLARE_GLOBAL_DATA_PTR; + +/* references to names in env_common.c */ +extern uchar default_environment[]; +extern int default_environment_size; + +char * env_name_spec = "SPI Flash"; +env_t *env_ptr; + +static struct spi_flash *env_flash; + +uchar env_get_char_spec(int index) +{ + return *((uchar *)(gd->env_addr + index)); +} + +int saveenv(void) +{ + if (!env_flash) { + puts("Environment SPI flash not initialized\n"); + return 1; + } + + puts("Erasing SPI flash..."); + if (spi_flash_erase(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE)) + return 1; + + puts("Writing to SPI flash..."); + if (spi_flash_write(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE, env_ptr)) + return 1; + + puts("done\n"); + return 0; +} + +void env_relocate_spec(void) +{ + int ret; + + env_flash = spi_flash_probe(CFG_ENV_SPI_BUS, CFG_ENV_SPI_CS, + CFG_ENV_SPI_MAX_HZ, CFG_ENV_SPI_MODE); + if (!env_flash) + goto err_probe; + + ret = spi_flash_read(env_flash, CFG_ENV_OFFSET, CFG_ENV_SIZE, env_ptr); + if (ret) + goto err_read; + + if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc) + goto err_crc; + + gd->env_valid = 1; + + return; + +err_read: + spi_flash_free(env_flash); + env_flash = NULL; +err_probe: +err_crc: + puts("*** Warning - bad CRC, using default environment\n\n"); + + if (default_environment_size > CFG_ENV_SIZE) { + gd->env_valid = 0; + puts("*** Error - default environment is too large\n\n"); + return; + } + + memset(env_ptr, 0, sizeof(env_t)); + memcpy(env_ptr->data, default_environment, default_environment_size); + env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE); + gd->env_valid = 1; +} + +int env_init(void) +{ + /* SPI flash isn't usable before relocation */ + gd->env_addr = (ulong)&default_environment[0]; + gd->env_valid = 1; + + return 0; +} + +#endif /* CFG_ENV_IS_IN_SPI_FLASH */ |