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Diffstat (limited to 'package/linux/kernel-source/include/bcmnvram.h')
| -rw-r--r-- | package/linux/kernel-source/include/bcmnvram.h | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/package/linux/kernel-source/include/bcmnvram.h b/package/linux/kernel-source/include/bcmnvram.h new file mode 100644 index 000000000..3c452634e --- /dev/null +++ b/package/linux/kernel-source/include/bcmnvram.h @@ -0,0 +1,148 @@ +/* + * NVRAM variable manipulation + * + * Copyright 2004, Broadcom Corporation + * All Rights Reserved. + * + * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY + * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM + * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS + * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE. + * + * $Id$ + */ + +#ifndef _bcmnvram_h_ +#define _bcmnvram_h_ + +#ifndef _LANGUAGE_ASSEMBLY + +#include <typedefs.h> + +struct nvram_header { + uint32 magic; + uint32 len; + uint32 crc_ver_init; /* 0:7 crc, 8:15 ver, 16:27 init, mem. test 28, 29-31 reserved */ + uint32 config_refresh; /* 0:15 config, 16:31 refresh */ + uint32 config_ncdl; /* ncdl values for memc */ +}; + +struct nvram_tuple { + char *name; + char *value; + struct nvram_tuple *next; +}; + +/* + * Initialize NVRAM access. May be unnecessary or undefined on certain + * platforms. + */ +extern int nvram_init(void *sbh); + +/* + * Disable NVRAM access. May be unnecessary or undefined on certain + * platforms. + */ +extern void nvram_exit(void); + +/* + * Get the value of an NVRAM variable. The pointer returned may be + * invalid after a set. + * @param name name of variable to get + * @return value of variable or NULL if undefined + */ +extern char * nvram_get(const char *name); + +/* + * Get the value of an NVRAM variable. + * @param name name of variable to get + * @return value of variable or NUL if undefined + */ +#define nvram_safe_get(name) (nvram_get(name) ? : "") + +#define nvram_safe_unset(name) ({ \ + if(nvram_get(name)) \ + nvram_unset(name); \ +}) + +#define nvram_safe_set(name, value) ({ \ + if(!nvram_get(name) || strcmp(nvram_get(name), value)) \ + nvram_set(name, value); \ +}) + +/* + * Match an NVRAM variable. + * @param name name of variable to match + * @param match value to compare against value of variable + * @return TRUE if variable is defined and its value is string equal + * to match or FALSE otherwise + */ +static INLINE int +nvram_match(char *name, char *match) { + const char *value = nvram_get(name); + return (value && !strcmp(value, match)); +} + +/* + * Inversely match an NVRAM variable. + * @param name name of variable to match + * @param match value to compare against value of variable + * @return TRUE if variable is defined and its value is not string + * equal to invmatch or FALSE otherwise + */ +static INLINE int +nvram_invmatch(char *name, char *invmatch) { + const char *value = nvram_get(name); + return (value && strcmp(value, invmatch)); +} + +/* + * Set the value of an NVRAM variable. The name and value strings are + * copied into private storage. Pointers to previously set values + * may become invalid. The new value may be immediately + * retrieved but will not be permanently stored until a commit. + * @param name name of variable to set + * @param value value of variable + * @return 0 on success and errno on failure + */ +extern int nvram_set(const char *name, const char *value); + +/* + * Unset an NVRAM variable. Pointers to previously set values + * remain valid until a set. + * @param name name of variable to unset + * @return 0 on success and errno on failure + * NOTE: use nvram_commit to commit this change to flash. + */ +extern int nvram_unset(const char *name); + +/* + * Commit NVRAM variables to permanent storage. All pointers to values + * may be invalid after a commit. + * NVRAM values are undefined after a commit. + * @return 0 on success and errno on failure + */ +extern int nvram_commit(void); + +/* + * Get all NVRAM variables (format name=value\0 ... \0\0). + * @param buf buffer to store variables + * @param count size of buffer in bytes + * @return 0 on success and errno on failure + */ +extern int nvram_getall(char *buf, int count); + +extern int file2nvram(char *filename, char *varname); +extern int nvram2file(char *varname, char *filename); + +#endif /* _LANGUAGE_ASSEMBLY */ + +#define NVRAM_MAGIC 0x48534C46 /* 'FLSH' */ +#define NVRAM_VERSION 1 +#define NVRAM_HEADER_SIZE 20 +#define NVRAM_SPACE 0x8000 +#define FLASH_BASE 0xbfc00000 /* Extif core */ +#define FLASH_MIN 0x00100000 /* Minimum flash size */ +#define FLASH_MAX 0x00400000 /* Maximum flash size with extif */ + +#endif /* _bcmnvram_h_ */ |