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

   1 /*
   2  * NVRAM variable manipulation
   3  *
   4  * Copyright 2006, 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: bcmnvram.h,v 1.17 2006/03/02 12:33:44 honor Exp $
  13  */
  14
  15 #ifndef _bcmnvram_h_
  16 #define _bcmnvram_h_
  17
  18 #ifndef _LANGUAGE_ASSEMBLY
  19
  20 #include <typedefs.h>
  21 #include <bcmdefs.h>
  22
  23 struct nvram_header {
  24         uint32 magic;
  25         uint32 len;
  26         uint32 crc_ver_init;    /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
  27         uint32 config_refresh;  /* 0:15 sdram_config, 16:31 sdram_refresh */
  28         uint32 config_ncdl;     /* ncdl values for memc */
  29 };
  30
  31 struct nvram_tuple {
  32         char *name;
  33         char *value;
  34         struct nvram_tuple *next;
  35 };
  36
  37 /*
  38  * Initialize NVRAM access. May be unnecessary or undefined on certain
  39  * platforms.
  40  */
  41 extern int nvram_init(void *sbh);
  42
  43 /*
  44  * Disable NVRAM access. May be unnecessary or undefined on certain
  45  * platforms.
  46  */
  47 extern void nvram_exit(void *sbh);
  48
  49 /*
  50  * Get the value of an NVRAM variable. The pointer returned may be
  51  * invalid after a set.
  52  * @param       name    name of variable to get
  53  * @return      value of variable or NULL if undefined
  54  */
  55 extern char * nvram_get(const char *name);
  56
  57 /*
  58  * Read the reset GPIO value from the nvram and set the GPIO
  59  * as input
  60  */
  61 extern int BCMINITFN(nvram_resetgpio_init)(void *sbh);
  62 extern int BCMINITFN(nvram_gpio_init)(const char *name, void *sbh);
  63 extern int BCMINITFN(nvram_gpio_set)(const char *name, void *sbh, int type);
  64
  65 /*
  66  * Get the value of an NVRAM variable.
  67  * @param       name    name of variable to get
  68  * @return      value of variable or NUL if undefined
  69  */
  70 #define nvram_safe_get(name) (nvram_get(name) ? : "")
  71
  72 #define nvram_safe_unset(name) ({ \
  73         if(nvram_get(name)) \
  74                 nvram_unset(name); \
  75 })
  76
  77 #define nvram_safe_set(name, value) ({ \
  78         if(!nvram_get(name) || strcmp(nvram_get(name), value)) \
  79                 nvram_set(name, value); \
  80 })
  81
  82 /*
  83  * Match an NVRAM variable.
  84  * @param       name    name of variable to match
  85  * @param       match   value to compare against value of variable
  86  * @return      TRUE if variable is defined and its value is string equal
  87  *              to match or FALSE otherwise
  88  */
  89 static INLINE int
  90 nvram_match(char *name, char *match) {
  91         const char *value = nvram_get(name);
  92         return (value && !strcmp(value, match));
  93 }
  94
  95 /*
  96  * Inversely match an NVRAM variable.
  97  * @param       name    name of variable to match
  98  * @param       match   value to compare against value of variable
  99  * @return      TRUE if variable is defined and its value is not string
 100  *              equal to invmatch or FALSE otherwise
 101  */
 102 static INLINE int
 103 nvram_invmatch(char *name, char *invmatch) {
 104         const char *value = nvram_get(name);
 105         return (value && strcmp(value, invmatch));
 106 }
 107
 108 /*
 109  * Set the value of an NVRAM variable. The name and value strings are
 110  * copied into private storage. Pointers to previously set values
 111  * may become invalid. The new value may be immediately
 112  * retrieved but will not be permanently stored until a commit.
 113  * @param       name    name of variable to set
 114  * @param       value   value of variable
 115  * @return      0 on success and errno on failure
 116  */
 117 extern int nvram_set(const char *name, const char *value);
 118
 119 /*
 120  * Unset an NVRAM variable. Pointers to previously set values
 121  * remain valid until a set.
 122  * @param       name    name of variable to unset
 123  * @return      0 on success and errno on failure
 124  * NOTE: use nvram_commit to commit this change to flash.
 125  */
 126 extern int nvram_unset(const char *name);
 127
 128 /*
 129  * Commit NVRAM variables to permanent storage. All pointers to values
 130  * may be invalid after a commit.
 131  * NVRAM values are undefined after a commit.
 132  * @return      0 on success and errno on failure
 133  */
 134 extern int nvram_commit(void);
 135
 136 /*
 137  * Get all NVRAM variables (format name=value\0 ... \0\0).
 138  * @param       buf     buffer to store variables
 139  * @param       count   size of buffer in bytes
 140  * @return      0 on success and errno on failure
 141  */
 142 extern int nvram_getall(char *buf, int count);
 143
 144 extern int file2nvram(char *filename, char *varname);
 145 extern int nvram2file(char *varname, char *filename);
 146
 147 #endif /* _LANGUAGE_ASSEMBLY */
 148
 149 #define NVRAM_MAGIC             0x48534C46      /* 'FLSH' */
 150 #define NVRAM_CLEAR_MAGIC               0x0
 151 #define NVRAM_INVALID_MAGIC     0xFFFFFFFF
 152 #define NVRAM_VERSION           1
 153 #define NVRAM_HEADER_SIZE       20
 154 #define NVRAM_SPACE             0x8000
 155
 156 #define NVRAM_MAX_VALUE_LEN 255
 157 #define NVRAM_MAX_PARAM_LEN 64
 158
 159 #endif /* _bcmnvram_h_ */