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Diffstat (limited to 'common/env_mmc.c')
| -rw-r--r-- | common/env_mmc.c | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/common/env_mmc.c b/common/env_mmc.c new file mode 100644 index 0000000..413a5c7 --- /dev/null +++ b/common/env_mmc.c @@ -0,0 +1,327 @@ +/* + * (C) Copyright 2008-2009 Freescale Semiconductor, Inc. + + * (C) Copyright 2000-2006 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com> + * Andreas Heppel <aheppel@sysgo.de> + + * 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 + */ + +/* #define DEBUG */ + +#include <common.h> + +#if defined(CONFIG_ENV_IS_IN_MMC) /* Environment is in MMC Flash */ + +#include <command.h> +#include <environment.h> +#include <linux/stddef.h> +#include <malloc.h> +#include <mmc.h> + +#if defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_MMC) +#define CMD_SAVEENV +#elif defined(CONFIG_ENV_OFFSET_REDUND) +#error Cannot use CONFIG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_MMC +#endif + +#if defined(CONFIG_ENV_SIZE_REDUND) && (CONFIG_ENV_SIZE_REDUND < CONFIG_ENV_SIZE) +#error CONFIG_ENV_SIZE_REDUND should not be less then CONFIG_ENV_SIZE +#endif + +#ifdef CONFIG_INFERNO +#error CONFIG_INFERNO not supported yet +#endif + +/* references to names in env_common.c */ +extern uchar default_environment[]; +extern int default_environment_size; + +char *env_name_spec = "MMC"; + +#ifdef ENV_IS_EMBEDDED +extern uchar environment[]; +env_t *env_ptr = (env_t *)(&environment[0]); +#else /* ! ENV_IS_EMBEDDED */ +env_t *env_ptr; +#endif /* ENV_IS_EMBEDDED */ + +/* local functions */ +#if !defined(ENV_IS_EMBEDDED) +static void use_default(void); +#endif + +DECLARE_GLOBAL_DATA_PTR; + +uchar env_get_char_spec(int index) +{ + return *((uchar *)(gd->env_addr + index)); +} + + +/* this is called before nand_init() + * so we can't read Nand to validate env data. + * Mark it OK for now. env_relocate() in env_common.c + * will call our relocate function which will does + * the real validation. + * + * When using a NAND boot image (like sequoia_nand), the environment + * can be embedded or attached to the U-Boot image in NAND flash. This way + * the SPL loads not only the U-Boot image from NAND but also the + * environment. + */ +int env_init(void) +{ +#if defined(CONFIG_IS_EMBEDDED) + size_t total; + int crc1_ok = 0, crc2_ok = 0; + env_t *tmp_env1, *tmp_env2; + + total = CONFIG_ENV_SIZE; + + tmp_env1 = env_ptr; + tmp_env2 = (env_t *)((ulong)env_ptr + CONFIG_ENV_SIZE); + + crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc); + crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc); + + if (!crc1_ok && !crc2_ok) + gd->env_valid = 0; + else if (crc1_ok && !crc2_ok) + gd->env_valid = 1; + else if (!crc1_ok && crc2_ok) + gd->env_valid = 2; + else { + /* both ok - check serial */ + if (tmp_env1->flags == 255 && tmp_env2->flags == 0) + gd->env_valid = 2; + else if (tmp_env2->flags == 255 && tmp_env1->flags == 0) + gd->env_valid = 1; + else if (tmp_env1->flags > tmp_env2->flags) + gd->env_valid = 1; + else if (tmp_env2->flags > tmp_env1->flags) + gd->env_valid = 2; + else /* flags are equal - almost impossible */ + gd->env_valid = 1; + } + + if (gd->env_valid == 1) + env_ptr = tmp_env1; + else if (gd->env_valid == 2) + env_ptr = tmp_env2; + +#else /* ENV_IS_EMBEDDED */ + gd->env_addr = (ulong)&default_environment[0]; + gd->env_valid = 1; + +#endif /* ENV_IS_EMBEDDED */ + + return 0; +} + +#ifdef CMD_SAVEENV +/* + * The legacy NAND code saved the environment in the first NAND device i.e., + * nand_dev_desc + 0. This is also the behaviour using the new NAND code. + */ +#ifdef CONFIG_ENV_OFFSET_REDUND +int saveenv(void) +{ + size_t total; + int ret = 0; + + env_ptr->flags++; + total = CONFIG_ENV_SIZE; + + if (gd->env_valid == 1) { + puts("Writing to redundant MMC... "); + ret = mmc_write((u_char *)env_ptr, + CONFIG_ENV_OFFSET_REDUND, total); + } else { + puts("Writing to MMC... "); + ret = mmc_write((u_char *)env_ptr, + CONFIG_ENV_OFFSET, total); + } + if (ret || total != CONFIG_ENV_SIZE) { + puts("failed\n"); + return 1; + } + + puts("done\n"); + gd->env_valid = (gd->env_valid == 2 ? 1 : 2); + return ret; +} +#else /* ! CONFIG_ENV_OFFSET_REDUND */ +int saveenv(void) +{ + size_t total; + int ret = 0; + + puts("Writing to MMC... "); + total = CONFIG_ENV_SIZE; + ret = mmc_write((u_char *)env_ptr, CONFIG_ENV_OFFSET, total); + if (ret || total != CONFIG_ENV_SIZE) { + puts("failed\n"); + return 1; + } + + puts("done\n"); + return ret; +} +#endif /* CONFIG_ENV_OFFSET_REDUND */ +#endif /* CMD_SAVEENV */ + +#ifdef CONFIG_ENV_OFFSET_REDUND +void env_relocate_spec(void) +{ +#if !defined(ENV_IS_EMBEDDED) + size_t total; + int crc1_ok = 0, crc2_ok = 0; + env_t *tmp_env1 = NULL, *tmp_env2 = NULL; + + puts("Initialing MMC card... \n"); + + if (mmc_init(1) != 0) { + puts("No MMC card found\n"); + goto use_default; + } + + total = CONFIG_ENV_SIZE; + + tmp_env1 = (env_t *)malloc(CONFIG_ENV_SIZE); + if (!tmp_env1) { + puts("Not enough memory!\n"); + goto use_default; + } + memset(tmp_env1, 0, CONFIG_ENV_SIZE); + + tmp_env2 = (env_t *)malloc(CONFIG_ENV_SIZE); + if (!tmp_env2) { + puts("Not enough memory!\n"); + goto use_default; + } + memset(tmp_env2, 0, CONFIG_ENV_SIZE); + + puts("Loading environment from mmc... "); + if (mmc_read(CONFIG_ENV_OFFSET, (uchar *)tmp_env1, total)) { + puts("failed\n"); + goto use_default; + } + puts("done\n"); + + puts("Loading redundant environment from mmc... "); + if (mmc_read(CONFIG_ENV_OFFSET_REDUND, (uchar *)tmp_env2, total)) { + puts("failed\n"); + goto use_default; + } + puts("done\n"); + + crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc); + crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc); + + if (!crc1_ok && !crc2_ok) + goto use_default; + else if (crc1_ok && !crc2_ok) + gd->env_valid = 1; + else if (!crc1_ok && crc2_ok) + gd->env_valid = 2; + else { + /* both ok - check serial */ + if (tmp_env1->flags == 255 && tmp_env2->flags == 0) + gd->env_valid = 2; + else if (tmp_env2->flags == 255 && tmp_env1->flags == 0) + gd->env_valid = 1; + else if (tmp_env1->flags > tmp_env2->flags) + gd->env_valid = 1; + else if (tmp_env2->flags > tmp_env1->flags) + gd->env_valid = 2; + else /* flags are equal - almost impossible */ + gd->env_valid = 1; + } + + free(env_ptr); + if (gd->env_valid == 1) { + env_ptr = tmp_env1; + free(tmp_env2); + } else { + env_ptr = tmp_env2; + free(tmp_env1); + } + + return; + +use_default: + if (tmp_env1) + free(tmp_env1); + if (tmp_env2) + free(tmp_env2); + return use_default(); + +#endif /* ! ENV_IS_EMBEDDED */ +} +#else /* ! CONFIG_ENV_OFFSET_REDUND */ +/* + * The legacy NAND code saved the environment in the first NAND device i.e., + * nand_dev_desc + 0. This is also the behaviour using the new NAND code. + */ +void env_relocate_spec(void) +{ +#if !defined(ENV_IS_EMBEDDED) + size_t total; + int ret; + + if (mmc_init(1) != 0) { + puts("No MMC card found\n"); + return; + } + + total = CONFIG_ENV_SIZE; + ret = mmc_read(CONFIG_ENV_OFFSET, (u_char *)env_ptr, &total); + if (ret || total != CONFIG_ENV_SIZE) + return use_default(); + + if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc) + return use_default(); +#endif /* ! ENV_IS_EMBEDDED */ +} +#endif /* CONFIG_ENV_OFFSET_REDUND */ + +#if !defined(ENV_IS_EMBEDDED) +static void use_default() +{ + puts("*** Warning - bad CRC or MMC Card, using default environment\n\n"); + + if (default_environment_size > CONFIG_ENV_SIZE) { + 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; +} +#endif + +#endif /* CONFIG_ENV_IS_IN_MMC */ |