package/linux/kernel-source/include/bcmnvram.h

   1 /*
   2  * NVRAM variable manipulation
   3  *
   4  * Copyright 2004, Broadcom Corporation
   5  * All Rights Reserved.
   6  *
   7  * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY
   8  * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM
   9  * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
  10  * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.
  11  *
  12  * $Id$
  13  */
  14
  15 #ifndef _bcmnvram_h_
  16 #define _bcmnvram_h_
  17
  18 #ifndef _LANGUAGE_ASSEMBLY
  19
  20 #include <typedefs.h>
  21
  22 struct nvram_header {
  23         uint32 magic;
  24         uint32 len;
  25         uint32 crc_ver_init;    /* 0:7 crc, 8:15 ver, 16:27 init, mem. test 28, 29-31 reserved */
  26         uint32 config_refresh;  /* 0:15 config, 16:31 refresh */
  27         uint32 config_ncdl;     /* ncdl values for memc */
  28 };
  29
  30 struct nvram_tuple {
  31         char *name;
  32         char *value;
  33         struct nvram_tuple *next;
  34 };
  35
  36 /*
  37  * Initialize NVRAM access. May be unnecessary or undefined on certain
  38  * platforms.
  39  */
  40 extern int nvram_init(void *sbh);
  41
  42 /*
  43  * Disable NVRAM access. May be unnecessary or undefined on certain
  44  * platforms.
  45  */
  46 extern void nvram_exit(void);
  47
  48 /*
  49  * Get the value of an NVRAM variable. The pointer returned may be
  50  * invalid after a set.
  51  * @param       name    name of variable to get
  52  * @return      value of variable or NULL if undefined
  53  */
  54 extern char * nvram_get(const char *name);
  55
  56 /*
  57  * Get the value of an NVRAM variable.
  58  * @param       name    name of variable to get
  59  * @return      value of variable or NUL if undefined
  60  */
  61 #define nvram_safe_get(name) (nvram_get(name) ? : "")
  62
  63 #define nvram_safe_unset(name) ({ \
  64         if(nvram_get(name)) \
  65                 nvram_unset(name); \
  66 })
  67
  68 #define nvram_safe_set(name, value) ({ \
  69         if(!nvram_get(name) || strcmp(nvram_get(name), value)) \
  70                 nvram_set(name, value); \
  71 })
  72
  73 /*
  74  * Match an NVRAM variable.
  75  * @param       name    name of variable to match
  76  * @param       match   value to compare against value of variable
  77  * @return      TRUE if variable is defined and its value is string equal
  78  *              to match or FALSE otherwise
  79  */
  80 static INLINE int
  81 nvram_match(char *name, char *match) {
  82         const char *value = nvram_get(name);
  83         return (value && !strcmp(value, match));
  84 }
  85
  86 /*
  87  * Inversely match an NVRAM variable.
  88  * @param       name    name of variable to match
  89  * @param       match   value to compare against value of variable
  90  * @return      TRUE if variable is defined and its value is not string
  91  *              equal to invmatch or FALSE otherwise
  92  */
  93 static INLINE int
  94 nvram_invmatch(char *name, char *invmatch) {
  95         const char *value = nvram_get(name);
  96         return (value && strcmp(value, invmatch));
  97 }
  98
  99 /*
 100  * Set the value of an NVRAM variable. The name and value strings are
 101  * copied into private storage. Pointers to previously set values
 102  * may become invalid. The new value may be immediately
 103  * retrieved but will not be permanently stored until a commit.
 104  * @param       name    name of variable to set
 105  * @param       value   value of variable
 106  * @return      0 on success and errno on failure
 107  */
 108 extern int nvram_set(const char *name, const char *value);
 109
 110 /*
 111  * Unset an NVRAM variable. Pointers to previously set values
 112  * remain valid until a set.
 113  * @param       name    name of variable to unset
 114  * @return      0 on success and errno on failure
 115  * NOTE: use nvram_commit to commit this change to flash.
 116  */
 117 extern int nvram_unset(const char *name);
 118
 119 /*
 120  * Commit NVRAM variables to permanent storage. All pointers to values
 121  * may be invalid after a commit.
 122  * NVRAM values are undefined after a commit.
 123  * @return      0 on success and errno on failure
 124  */
 125 extern int nvram_commit(void);
 126
 127 /*
 128  * Get all NVRAM variables (format name=value\0 ... \0\0).
 129  * @param       buf     buffer to store variables
 130  * @param       count   size of buffer in bytes
 131  * @return      0 on success and errno on failure
 132  */
 133 extern int nvram_getall(char *buf, int count);
 134
 135 extern int file2nvram(char *filename, char *varname);
 136 extern int nvram2file(char *varname, char *filename);
 137
 138 #endif /* _LANGUAGE_ASSEMBLY */
 139
 140 #define NVRAM_MAGIC             0x48534C46      /* 'FLSH' */
 141 #define NVRAM_VERSION           1
 142 #define NVRAM_HEADER_SIZE       20
 143 #define NVRAM_SPACE             0x8000
 144 #define FLASH_BASE              0xbfc00000      /* Extif core */
 145 #define FLASH_MIN               0x00100000      /* Minimum flash size */
 146 #define FLASH_MAX               0x00400000      /* Maximum flash size with extif */
 147
 148 #endif /* _bcmnvram_h_ */