* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.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
+ * SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _ENVIRONMENT_H_
#define _ENVIRONMENT_H_
+#include <linux/kconfig.h>
+
/**************************************************************************
*
* The "environment" is stored as a list of '\0' terminated
* shifts the remaining entries to the front. Replacing an entry is a
* combination of deleting the old value and adding the new one.
*
- * The environment is preceeded by a 32 bit CRC over the data part.
+ * The environment is preceded by a 32 bit CRC over the data part.
*
- **************************************************************************
- */
+ *************************************************************************/
#if defined(CONFIG_ENV_IS_IN_FLASH)
# ifndef CONFIG_ENV_ADDR
# endif
#endif /* CONFIG_ENV_IS_IN_FLASH */
+#if defined(CONFIG_ENV_IS_IN_MMC)
+# ifdef CONFIG_ENV_OFFSET_REDUND
+# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
+# endif
+#endif
+
#if defined(CONFIG_ENV_IS_IN_NAND)
# if defined(CONFIG_ENV_OFFSET_OOB)
# ifdef CONFIG_ENV_OFFSET_REDUND
# ifndef CONFIG_ENV_UBI_VOLUME
# error "Need to define CONFIG_ENV_UBI_VOLUME when using CONFIG_ENV_IS_IN_UBI"
# endif
+# if defined(CONFIG_ENV_UBI_VOLUME_REDUND)
+# define CONFIG_SYS_REDUNDAND_ENVIRONMENT
+# endif
# ifndef CONFIG_ENV_SIZE
# error "Need to define CONFIG_ENV_SIZE when using CONFIG_ENV_IS_IN_UBI"
# endif
# define ENV_HEADER_SIZE (sizeof(uint32_t))
#endif
-#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
-extern char *env_name_spec;
-#endif
-
#define ENV_SIZE (CONFIG_ENV_SIZE - ENV_HEADER_SIZE)
typedef struct environment_s {
extern const unsigned char default_environment[];
extern env_t *env_ptr;
-extern void env_relocate_spec(void);
-extern unsigned char env_get_char_spec(int);
-
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
extern void env_reloc(void);
#endif
+#ifdef CONFIG_ENV_IS_IN_MMC
+#include <mmc.h>
+
+extern int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr);
+# ifdef CONFIG_SYS_MMC_ENV_PART
+extern uint mmc_get_env_part(struct mmc *mmc);
+# endif
+#endif
+
#ifndef DO_DEPS_ONLY
#include <env_attr.h>
#include <env_flags.h>
#include <search.h>
-extern struct hsearch_data env_htab;
+/* Value for environment validity */
+enum env_valid {
+ ENV_INVALID, /* No valid environment */
+ ENV_VALID, /* First or only environment is valid */
+ ENV_REDUND, /* Redundant environment is valid */
+};
+
+enum env_location {
+ ENVL_EEPROM,
+ ENVL_EXT4,
+ ENVL_FAT,
+ ENVL_FLASH,
+ ENVL_MMC,
+ ENVL_NAND,
+ ENVL_NVRAM,
+ ENVL_ONENAND,
+ ENVL_REMOTE,
+ ENVL_SPI_FLASH,
+ ENVL_UBI,
+ ENVL_NOWHERE,
+
+ ENVL_COUNT,
+ ENVL_UNKNOWN,
+};
+
+struct env_driver {
+ const char *name;
+ enum env_location location;
+
+ /**
+ * get_char() - Read a character from the environment
+ *
+ * This method is optional. If not provided, a default implementation
+ * will read from gd->env_addr.
+ *
+ * @index: Index of character to read (0=first)
+ * @return character read, or -ve on error
+ */
+ int (*get_char)(int index);
+
+ /**
+ * load() - Load the environment from storage
+ *
+ * This method is optional. If not provided, no environment will be
+ * loaded.
+ *
+ * @return 0 if OK, -ve on error
+ */
+ int (*load)(void);
-/* Function that returns a character from the environment */
-unsigned char env_get_char(int);
+ /**
+ * save() - Save the environment to storage
+ *
+ * This method is required for 'saveenv' to work.
+ *
+ * @return 0 if OK, -ve on error
+ */
+ int (*save)(void);
-/* Function that returns a pointer to a value from the environment */
-const unsigned char *env_get_addr(int);
-unsigned char env_get_char_memory(int index);
+ /**
+ * init() - Set up the initial pre-relocation environment
+ *
+ * This method is optional.
+ *
+ * @return 0 if OK, -ENOENT if no initial environment could be found,
+ * other -ve on error
+ */
+ int (*init)(void);
+};
+
+/* Declare a new environment location driver */
+#define U_BOOT_ENV_LOCATION(__name) \
+ ll_entry_declare(struct env_driver, __name, env_driver)
+
+/* Declare the name of a location */
+#ifdef CONFIG_CMD_SAVEENV
+#define ENV_NAME(_name) .name = _name,
+#else
+#define ENV_NAME(_name)
+#endif
+
+#ifdef CONFIG_CMD_SAVEENV
+#define env_save_ptr(x) x
+#else
+#define env_save_ptr(x) NULL
+#endif
+
+extern struct hsearch_data env_htab;
/* Function that updates CRC of the enironment */
void env_crc_update(void);
/* Look up the variable from the default environment */
-char *getenv_default(const char *name);
+char *env_get_default(const char *name);
/* [re]set to the default environment */
void set_default_env(const char *s);
/* Import from binary representation into hash table */
int env_import(const char *buf, int check);
+/* Export from hash table into binary representation */
+int env_export(env_t *env_out);
+
+#ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
+/* Select and import one of two redundant environments */
+int env_import_redund(const char *buf1, const char *buf2);
+#endif
+
+/**
+ * env_get_char() - Get a character from the early environment
+ *
+ * This reads from the pre-relocation environemnt
+ *
+ * @index: Index of character to read (0 = first)
+ * @return character read, or -ve on error
+ */
+int env_get_char(int index);
+
+/**
+ * env_load() - Load the environment from storage
+ *
+ * @return 0 if OK, -ve on error
+ */
+int env_load(void);
+
+/**
+ * env_save() - Save the environment to storage
+ *
+ * @return 0 if OK, -ve on error
+ */
+int env_save(void);
+
#endif /* DO_DEPS_ONLY */
#endif /* _ENVIRONMENT_H_ */
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