FlashSimBlockDevice.h

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2018 ARM Limited
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
00020  * SOFTWARE.
00021  */
00022 #ifndef MBED_FLASH_SIM_BLOCK_DEVICE_H
00023 #define MBED_FLASH_SIM_BLOCK_DEVICE_H
00024 
00025 #include "BlockDevice.h"
00026 
00027 enum {
00028     BD_ERROR_NOT_ERASED       = -3201,
00029 };
00030 
00031 /** Flash simulating block device
00032  *
00033  * Flash simulation BD adaptor
00034  *
00035  */
00036 class FlashSimBlockDevice : public BlockDevice {
00037 public:
00038 
00039     /** Constructor
00040      *
00041      * @param bd           Block device to back the FlashSimBlockDevice
00042      * @param erase_value  Value stored in a block after it's erased
00043      */
00044     FlashSimBlockDevice(BlockDevice *bd, uint8_t erase_value = 0xFF);
00045     virtual ~FlashSimBlockDevice();
00046 
00047     /** Initialize a block device
00048      *
00049      *  @return         0 on success or a negative error code on failure
00050      */
00051     virtual int init();
00052 
00053     /** Deinitialize the block device
00054      *
00055      *  @return         0 on success or a negative error code on failure
00056      */
00057     virtual int deinit();
00058 
00059     /** Ensure data on storage is in sync with the driver
00060      *
00061      *  @return         0 on success or a negative error code on failure
00062      */
00063     virtual int sync();
00064 
00065     /** Read blocks from the block device
00066      *
00067      *  @param buffer   Buffer to read blocks into
00068      *  @param addr     Address of block to begin reading from
00069      *  @param size     Size to read in bytes, must be a multiple of read block size
00070      *  @return         0 on success, negative error code on failure
00071      */
00072     virtual int read(void *buffer, bd_addr_t addr, bd_size_t size);
00073 
00074     /** Program blocks to the block device
00075      *
00076      *  The blocks must have been erased prior to being programmed
00077      *
00078      *  @param buffer   Buffer of data to write to blocks
00079      *  @param addr     Address of block to begin writing to
00080      *  @param size     Size to write in bytes, must be a multiple of program block size
00081      *  @return         0 on success, negative error code on failure
00082      */
00083     virtual int program(const void *buffer, bd_addr_t addr, bd_size_t size);
00084 
00085     /** Erase blocks on the block device
00086      *
00087      *  Required before any write to these addresses
00088      *
00089      *  @param addr     Address of block to begin erasing
00090      *  @param size     Size to erase in bytes, must be a multiple of erase block size
00091      *  @return         0 on success, negative error code on failure
00092      */
00093     virtual int erase(bd_addr_t addr, bd_size_t size);
00094 
00095     /** Get the size of a readable block
00096      *
00097      *  @return         Size of a readable block in bytes
00098      */
00099     virtual bd_size_t get_read_size() const;
00100 
00101     /** Get the size of a programmable block
00102      *
00103      *  @return         Size of a programmable block in bytes
00104      */
00105     virtual bd_size_t get_program_size() const;
00106 
00107     /** Get the size of an erasable block
00108      *
00109      *  @return         Size of an erasable block in bytes
00110      */
00111     virtual bd_size_t get_erase_size() const;
00112 
00113     /** Get the size of an erasable block given address
00114      *
00115      *  @param addr     Address within the erasable block
00116      *  @return         Size of an erasable block in bytes
00117      *  @note Must be a multiple of the program size
00118      */
00119     virtual bd_size_t get_erase_size(bd_addr_t addr) const;
00120 
00121     /** Get the value of storage when erased
00122      *
00123      *  @return         The value of storage when erased
00124      */
00125     virtual int get_erase_value() const;
00126 
00127     /** Get the total size of the underlying device
00128      *
00129      *  @return         Size of the underlying device in bytes
00130      */
00131     virtual bd_size_t size() const;
00132 
00133 private:
00134     uint8_t _erase_value;
00135     bd_size_t _blank_buf_size;
00136     uint8_t *_blank_buf;
00137     BlockDevice *_bd;
00138     uint32_t _init_ref_count;
00139     bool _is_initialized;
00140 };
00141 
00142 #endif