release/src-rt-6.x.4708/include/bcmnvram.h

   1 /*
   2  * NVRAM variable manipulation
   3  *
   4  * Copyright (C) 2012, Broadcom Corporation. All Rights Reserved.
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  13  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  15  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  16  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  *
  18  * $Id: bcmnvram.h 398971 2013-04-26 22:39:49Z $
  19  */
  20
  21 #ifndef _bcmnvram_h_
  22 #define _bcmnvram_h_
  23
  24 #ifndef _LANGUAGE_ASSEMBLY
  25
  26 #include <typedefs.h>
  27 #include <bcmdefs.h>
  28
  29 struct nvram_header {
  30         uint32 magic;
  31         uint32 len;
  32         uint32 crc_ver_init;    /* 0:7 crc, 8:15 ver, 16:31 sdram_init */
  33         uint32 config_refresh;  /* 0:15 sdram_config, 16:31 sdram_refresh */
  34         uint32 config_ncdl;     /* ncdl values for memc */
  35 };
  36
  37 struct nvram_tuple {
  38         char *name;
  39         char *value;
  40         struct nvram_tuple *next;
  41 };
  42
  43 /*
  44  * Get default value for an NVRAM variable
  45  */
  46 extern char *nvram_default_get(const char *name);
  47 /*
  48  * validate/restore all per-interface related variables
  49  */
  50 extern void nvram_validate_all(char *prefix, bool restore);
  51
  52 /*
  53  * restore specific per-interface variable
  54  */
  55 extern void nvram_restore_var(char *prefix, char *name);
  56
  57 /*
  58  * Initialize NVRAM access. May be unnecessary or undefined on certain
  59  * platforms.
  60  */
  61 extern int nvram_init(void *sih);
  62 extern int nvram_deinit(void *sih);
  63
  64 #if defined(_CFE_) && defined(BCM_DEVINFO)
  65 extern char *flashdrv_nvram;
  66 extern char *devinfo_flashdrv_nvram;
  67 extern int devinfo_nvram_init(void *sih);
  68 extern int devinfo_nvram_sync(void);
  69 extern void _nvram_hash_select(int idx);
  70 #endif
  71
  72 /*
  73  * Append a chunk of nvram variables to the global list
  74  */
  75 extern int nvram_append(void *si, char *vars, uint varsz);
  76
  77 extern void nvram_get_global_vars(char **varlst, uint *varsz);
  78
  79
  80 /*
  81  * Check for reset button press for restoring factory defaults.
  82  */
  83 extern int nvram_reset(void *sih);
  84
  85 /*
  86  * Disable NVRAM access. May be unnecessary or undefined on certain
  87  * platforms.
  88  */
  89 extern void nvram_exit(void *sih);
  90
  91 /*
  92  * Get the value of an NVRAM variable. The pointer returned may be
  93  * invalid after a set.
  94  * @param       name    name of variable to get
  95  * @return      value of variable or NULL if undefined
  96  */
  97 extern char * nvram_get(const char *name);
  98
  99 /*
 100  * Read the reset GPIO value from the nvram and set the GPIO
 101  * as input
 102  */
 103 extern int BCMINITFN(nvram_resetgpio_init)(void *sih);
 104
 105 /*
 106  * Get the value of an NVRAM variable.
 107  * @param       name    name of variable to get
 108  * @return      value of variable or NUL if undefined
 109  */
 110 static INLINE char *
 111 nvram_safe_get(const char *name)
 112 {
 113         char *p = nvram_get(name);
 114         return p ? p : "";
 115 }
 116
 117 /*
 118  * Match an NVRAM variable.
 119  * @param       name    name of variable to match
 120  * @param       match   value to compare against value of variable
 121  * @return      TRUE if variable is defined and its value is string equal
 122  *              to match or FALSE otherwise
 123  */
 124 static INLINE int
 125 nvram_match(const char *name, const char *match)
 126 {
 127         const char *value = nvram_get(name);
 128         return (value && !strcmp(value, match));
 129 }
 130
 131 /*
 132  * Inversely match an NVRAM variable.
 133  * @param       name    name of variable to match
 134  * @param       match   value to compare against value of variable
 135  * @return      TRUE if variable is defined and its value is not string
 136  *              equal to invmatch or FALSE otherwise
 137  */
 138 static INLINE int
 139 nvram_invmatch(const char *name, const char *invmatch)
 140 {
 141         const char *value = nvram_get(name);
 142         return (value && strcmp(value, invmatch));
 143 }
 144
 145 /*
 146  * Set the value of an NVRAM variable. The name and value strings are
 147  * copied into private storage. Pointers to previously set values
 148  * may become invalid. The new value may be immediately
 149  * retrieved but will not be permanently stored until a commit.
 150  * @param       name    name of variable to set
 151  * @param       value   value of variable
 152  * @return      0 on success and errno on failure
 153  */
 154 extern int nvram_set(const char *name, const char *value);
 155
 156 /*
 157  * Unset an NVRAM variable. Pointers to previously set values
 158  * remain valid until a set.
 159  * @param       name    name of variable to unset
 160  * @return      0 on success and errno on failure
 161  * NOTE: use nvram_commit to commit this change to flash.
 162  */
 163 extern int nvram_unset(const char *name);
 164
 165 /*
 166  * Commit NVRAM variables to permanent storage. All pointers to values
 167  * may be invalid after a commit.
 168  * NVRAM values are undefined after a commit.
 169  * @param   nvram_corrupt    true to corrupt nvram, false otherwise.
 170  * @return      0 on success and errno on failure
 171  */
 172 extern int nvram_commit_internal(bool nvram_corrupt);
 173
 174 /*
 175  * Commit NVRAM variables to permanent storage. All pointers to values
 176  * may be invalid after a commit.
 177  * NVRAM values are undefined after a commit.
 178  * @return      0 on success and errno on failure
 179  */
 180 extern int nvram_commit(void);
 181
 182 /*
 183  * Get all NVRAM variables (format name=value\0 ... \0\0).
 184  * @param       buf     buffer to store variables
 185  * @param       count   size of buffer in bytes
 186  * @return      0 on success and errno on failure
 187  */
 188 extern int nvram_getall(char *nvram_buf, int count);
 189
 190 /*
 191  * returns the crc value of the nvram
 192  * @param       nvh     nvram header pointer
 193  */
 194 uint8 nvram_calc_crc(struct nvram_header * nvh);
 195
 196 extern int nvram_space;
 197 #endif /* _LANGUAGE_ASSEMBLY */
 198
 199 /* The NVRAM version number stored as an NVRAM variable */
 200 #define NVRAM_SOFTWARE_VERSION  "1"
 201
 202 #define NVRAM_MAGIC             0x48534C46      /* 'FLSH' */
 203 #define NVRAM_CLEAR_MAGIC       0x0
 204 #define NVRAM_INVALID_MAGIC     0xFFFFFFFF
 205 #define NVRAM_VERSION           1
 206 #define NVRAM_HEADER_SIZE       20
 207 /* This definition is for precommit staging, and will be removed */
 208 #define NVRAM_SPACE             0x10000
 209 /* For CFE builds this gets passed in thru the makefile */
 210 #ifndef MAX_NVRAM_SPACE
 211 #define MAX_NVRAM_SPACE         0x10000
 212 #endif
 213 #define DEF_NVRAM_SPACE         0x10000
 214 #define ROM_ENVRAM_SPACE        0x1000
 215 #define NVRAM_LZMA_MAGIC        0x4c5a4d41      /* 'LZMA' */
 216
 217 #define NVRAM_MAX_VALUE_LEN 2048
 218 #define NVRAM_MAX_PARAM_LEN 64
 219
 220 #define NVRAM_CRC_START_POSITION        9 /* magic, len, crc8 to be skipped */
 221 #define NVRAM_CRC_VER_MASK      0xffffff00 /* for crc_ver_init */
 222
 223 /* Offsets to embedded nvram area */
 224 #define NVRAM_START_COMPRESSED  0x400
 225 #define NVRAM_START             0x1000
 226
 227 #define BCM_JUMBO_NVRAM_DELIMIT '\n'
 228 #define BCM_JUMBO_START "Broadcom Jumbo Nvram file"
 229
 230 #if !defined(BCMHIGHSDIO) && defined(BCMTRXV2)
 231 extern char *_vars;
 232 extern uint _varsz;
 233 #endif
 234
 235 #if (defined(FAILSAFE_UPGRADE) || defined(CONFIG_FAILSAFE_UPGRADE) || \
 236         defined(__CONFIG_FAILSAFE_UPGRADE_SUPPORT__))
 237 #define IMAGE_SIZE "image_size"
 238 #define BOOTPARTITION "bootpartition"
 239 #define IMAGE_BOOT BOOTPARTITION
 240 #define PARTIALBOOTS "partialboots"
 241 #define MAXPARTIALBOOTS "maxpartialboots"
 242 #define IMAGE_1ST_FLASH_TRX "flash0.trx"
 243 #define IMAGE_1ST_FLASH_OS "flash0.os"
 244 #define IMAGE_2ND_FLASH_TRX "flash0.trx2"
 245 #define IMAGE_2ND_FLASH_OS "flash0.os2"
 246 #define IMAGE_FIRST_OFFSET "image_first_offset"
 247 #define IMAGE_SECOND_OFFSET "image_second_offset"
 248 #define LINUX_FIRST "linux"
 249 #define LINUX_SECOND "linux2"
 250 #endif
 251
 252 #if (defined(DUAL_IMAGE) || defined(CONFIG_DUAL_IMAGE) || \
 253         defined(__CONFIG_DUAL_IMAGE_FLASH_SUPPORT__))
 254 /* Shared by all: CFE, Linux Kernel, and Ap */
 255 #define IMAGE_BOOT "image_boot"
 256 #define BOOTPARTITION IMAGE_BOOT
 257 /* CFE variables */
 258 #define IMAGE_1ST_FLASH_TRX "flash0.trx"
 259 #define IMAGE_1ST_FLASH_OS "flash0.os"
 260 #define IMAGE_2ND_FLASH_TRX "flash0.trx2"
 261 #define IMAGE_2ND_FLASH_OS "flash0.os2"
 262 #define IMAGE_SIZE "image_size"
 263
 264 /* CFE and Linux Kernel shared variables */
 265 #define IMAGE_FIRST_OFFSET "image_first_offset"
 266 #define IMAGE_SECOND_OFFSET "image_second_offset"
 267
 268 /* Linux application variables */
 269 #define LINUX_FIRST "linux"
 270 #define LINUX_SECOND "linux2"
 271 #define POLICY_TOGGLE "toggle"
 272 #define LINUX_PART_TO_FLASH "linux_to_flash"
 273 #define LINUX_FLASH_POLICY "linux_flash_policy"
 274
 275 #endif /* defined(DUAL_IMAGE||CONFIG_DUAL_IMAGE)||__CONFIG_DUAL_IMAGE_FLASH_SUPPORT__ */
 276
 277 #endif /* _bcmnvram_h_ */