hw/hal/include/hal/flash_map.h

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#ifndef H_UTIL_FLASH_MAP_
#define H_UTIL_FLASH_MAP_

/**
 *
 * Provides abstraction of flash regions for type of use.
 * I.e. dude where's my image?
 *
 * System will contain a map which contains flash areas. Every
 * region will contain flash identifier, offset within flash and length.
 *
 * 1. This system map could be in a file within filesystem (Initializer
 * must know/figure out where the filesystem is at).
 * 2. Map could be at fixed location for project (compiled to code)
 * 3. Map could be at specific place in flash (put in place at mfg time).
 *
 * Note that the map you use must be valid for BSP it's for,
 * match the linker scripts when platform executes from flash,
 * and match the target offset specified in download script.
 */
#include <inttypes.h>

struct flash_area {
    uint8_t fa_flash_id;
    uint8_t _pad[3];
    uint32_t fa_off;
    uint32_t fa_size;
};

/*
 * Flash area types
 */
#define FLASH_AREA_BOOTLOADER           0
#define FLASH_AREA_IMAGE_0              1
#define FLASH_AREA_IMAGE_1              2
#define FLASH_AREA_IMAGE_SCRATCH        3
#define FLASH_AREA_NFFS                 4

/*
 * Initializes flash map. Memory will be referenced by flash_map code
 * from this on.
 */
void flash_area_init(const struct flash_area *map, int map_entries);

/*
 * Start using flash area.
 */
int flash_area_open(int idx, const struct flash_area **);

void flash_area_close(const struct flash_area *);

/*
 * Read/write/erase. Offset is relative from beginning of flash area.
 */
int flash_area_read(const struct flash_area *, uint32_t off, void *dst,
  uint32_t len);
int flash_area_write(const struct flash_area *, uint32_t off, void *src,
  uint32_t len);
int flash_area_erase(const struct flash_area *, uint32_t off, uint32_t len);

/*
 * Given flash map index, return info about sectors within the area.
 */
int flash_area_to_sectors(int idx, int *cnt, struct flash_area *ret);

/*
 * Given flash map index, return sector info in NFFS area desc format.
 */
struct nffs_area_desc;
int flash_area_to_nffs_desc(int idx, int *cnt, struct nffs_area_desc *nad);

#endif /* H_UTIL_FLASH_MAP_ */