target/linux/brcm-2.4/files/arch/mips/bcm947xx/include/bcmnvram.h

   1 /*
   2  * NVRAM variable manipulation
   3  *
   4  * Copyright 2007, 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  */
  13
  14 #ifndef _bcmnvram_h_
  15 #define _bcmnvram_h_
  16
  17 #ifndef _LANGUAGE_ASSEMBLY
  18
  19 #include <typedefs.h>
  20 #include <bcmdefs.h>
  21
  22 struct nvram_header {
  23         uint32 magic;
  24         uint32 len;
  25         uint32 crc_ver_init;    /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
  26         uint32 config_refresh;  /* 0:15 sdram_config, 16:31 sdram_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  * Get default value for an NVRAM variable
  38  */
  39 extern char *nvram_default_get(const char *name);
  40
  41 /*
  42  * Append a chunk of nvram variables to the global list
  43  */
  44 extern int nvram_append(void *sb, char *vars, uint varsz);
  45
  46 /*
  47  * Check for reset button press for restoring factory defaults.
  48  */
  49 extern bool nvram_reset(void *sbh);
  50
  51 /*
  52  * Disable NVRAM access. May be unnecessary or undefined on certain
  53  * platforms.
  54  */
  55 extern void nvram_exit(void *sbh);
  56
  57 /*
  58  * Get the value of an NVRAM variable. The pointer returned may be
  59  * invalid after a set.
  60  * @param       name    name of variable to get
  61  * @return      value of variable or NULL if undefined
  62  */
  63 extern char * nvram_get(const char *name);
  64
  65 /*
  66  * Read the reset GPIO value from the nvram and set the GPIO
  67  * as input
  68  */
  69 extern int BCMINITFN(nvram_resetgpio_init)(void *sbh);
  70
  71 /*
  72  * Get the value of an NVRAM variable.
  73  * @param       name    name of variable to get
  74  * @return      value of variable or NUL if undefined
  75  */
  76 #define nvram_safe_get(name) (nvram_get(name) ? : "")
  77
  78 /*
  79  * Match an NVRAM variable.
  80  * @param       name    name of variable to match
  81  * @param       match   value to compare against value of variable
  82  * @return      TRUE if variable is defined and its value is string equal
  83  *              to match or FALSE otherwise
  84  */
  85 static INLINE int
  86 nvram_match(char *name, char *match) {
  87         const char *value = nvram_get(name);
  88         return (value && !strcmp(value, match));
  89 }
  90
  91 /*
  92  * Inversely match an NVRAM variable.
  93  * @param       name    name of variable to match
  94  * @param       match   value to compare against value of variable
  95  * @return      TRUE if variable is defined and its value is not string
  96  *              equal to invmatch or FALSE otherwise
  97  */
  98 static INLINE int
  99 nvram_invmatch(char *name, char *invmatch) {
 100         const char *value = nvram_get(name);
 101         return (value && strcmp(value, invmatch));
 102 }
 103
 104 /*
 105  * Set the value of an NVRAM variable. The name and value strings are
 106  * copied into private storage. Pointers to previously set values
 107  * may become invalid. The new value may be immediately
 108  * retrieved but will not be permanently stored until a commit.
 109  * @param       name    name of variable to set
 110  * @param       value   value of variable
 111  * @return      0 on success and errno on failure
 112  */
 113 extern int nvram_set(const char *name, const char *value);
 114
 115 /*
 116  * Unset an NVRAM variable. Pointers to previously set values
 117  * remain valid until a set.
 118  * @param       name    name of variable to unset
 119  * @return      0 on success and errno on failure
 120  * NOTE: use nvram_commit to commit this change to flash.
 121  */
 122 extern int nvram_unset(const char *name);
 123
 124 /*
 125  * Commit NVRAM variables to permanent storage. All pointers to values
 126  * may be invalid after a commit.
 127  * NVRAM values are undefined after a commit.
 128  * @return      0 on success and errno on failure
 129  */
 130 extern int nvram_commit(void);
 131
 132 /*
 133  * Get all NVRAM variables (format name=value\0 ... \0\0).
 134  * @param       buf     buffer to store variables
 135  * @param       count   size of buffer in bytes
 136  * @return      0 on success and errno on failure
 137  */
 138 extern int nvram_getall(char *nvram_buf, int count);
 139
 140 /*
 141  * returns the crc value of the nvram
 142  * @param       nvh     nvram header pointer
 143  */
 144 extern uint8 nvram_calc_crc(struct nvram_header * nvh);
 145
 146 extern char* getvar(char *vars, const char *name);
 147 extern int getintvar(char *vars, const char *name);
 148
 149 #endif /* _LANGUAGE_ASSEMBLY */
 150
 151 /* The NVRAM version number stored as an NVRAM variable */
 152 #define NVRAM_SOFTWARE_VERSION  "1"
 153
 154 #define NVRAM_MAGIC             0x48534C46      /* 'FLSH' */
 155 #define NVRAM_CLEAR_MAGIC       0x0
 156 #define NVRAM_INVALID_MAGIC     0xFFFFFFFF
 157 #define NVRAM_VERSION           1
 158 #define NVRAM_HEADER_SIZE       20
 159 #define NVRAM_SPACE             0x8000
 160
 161 #define NVRAM_MAX_VALUE_LEN 255
 162 #define NVRAM_MAX_PARAM_LEN 64
 163
 164 #define NVRAM_CRC_START_POSITION        9 /* magic, len, crc8 to be skipped */
 165 #define NVRAM_CRC_VER_MASK      0xffffff00 /* for crc_ver_init */
 166
 167 #endif /* _bcmnvram_h_ */