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SlicingBlockDevice.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2017 ARM Limited
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a copy
5  * of this software and associated documentation files (the "Software"), to deal
6  * in the Software without restriction, including without limitation the rights
7  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8  * copies of the Software, and to permit persons to whom the Software is
9  * furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20  * SOFTWARE.
21  */
22 
23 /** \addtogroup storage */
24 /** @{*/
25 
26 #ifndef MBED_SLICING_BLOCK_DEVICE_H
27 #define MBED_SLICING_BLOCK_DEVICE_H
28 
29 #include "BlockDevice.h"
30 #include "platform/mbed_assert.h"
31 
32 namespace mbed {
33 
34 /** Block device for mapping to a slice of another block device
35  */
37 public:
38  /** Lifetime of the memory block device
39  *
40  * @param bd Block device to back the SlicingBlockDevice
41  * @param start Start block address to map to block 0, negative addresses
42  * are calculated from the end of the underlying block device
43  * @param end End block address to mark the end of the block device,
44  * this block is not mapped, negative addresses are
45  * calculated from the end of the underlying block device.
46  * The default stops at end of the underlying block device.
47  */
48  SlicingBlockDevice(BlockDevice *bd, bd_addr_t start, bd_addr_t end = 0);
49 
50  /** Lifetime of a block device
51  */
52  virtual ~SlicingBlockDevice() {};
53 
54  /** Initialize a block device
55  *
56  * @return 0 on success or a negative error code on failure
57  */
58  virtual int init();
59 
60  /** Deinitialize a block device
61  *
62  * @return 0 on success or a negative error code on failure
63  */
64  virtual int deinit();
65 
66  /** Ensure data on storage is in sync with the driver
67  *
68  * @return 0 on success or a negative error code on failure
69  */
70  virtual int sync();
71 
72  /** Read blocks from a block device
73  *
74  * @param buffer Buffer to read blocks into
75  * @param addr Address of block to begin reading from
76  * @param size Size to read in bytes, must be a multiple of read block size
77  * @return 0 on success or a negative error code on failure
78  */
79  virtual int read(void *buffer, bd_addr_t addr, bd_size_t size);
80 
81  /** Program blocks to a block device
82  *
83  * The blocks must have been erased prior to being programmed
84  *
85  * @param buffer Buffer of data to write to blocks
86  * @param addr Address of block to begin writing to
87  * @param size Size to write in bytes, must be a multiple of program block size
88  * @return 0 on success or a negative error code on failure
89  */
90  virtual int program(const void *buffer, bd_addr_t addr, bd_size_t size);
91 
92  /** Erase blocks on a block device
93  *
94  * The state of an erased block is undefined until it has been programmed,
95  * unless get_erase_value returns a non-negative byte value
96  *
97  * @param addr Address of block to begin erasing
98  * @param size Size to erase in bytes, must be a multiple of erase block size
99  * @return 0 on success or a negative error code on failure
100  */
101  virtual int erase(bd_addr_t addr, bd_size_t size);
102 
103  /** Get the size of a readable block
104  *
105  * @return Size of a readable block in bytes
106  */
107  virtual bd_size_t get_read_size() const;
108 
109  /** Get the size of a programmable block
110  *
111  * @return Size of a programmable block in bytes
112  * @note Must be a multiple of the read size
113  */
114  virtual bd_size_t get_program_size() const;
115 
116  /** Get the size of an erasable block
117  *
118  * @return Size of an erasable block in bytes
119  * @note Must be a multiple of the program size
120  */
121  virtual bd_size_t get_erase_size() const;
122 
123  /** Get the size of an erasable block given address
124  *
125  * @param addr Address within the erasable block
126  * @return Size of an erasable block in bytes
127  * @note Must be a multiple of the program size
128  */
129  virtual bd_size_t get_erase_size(bd_addr_t addr) const;
130 
131  /** Get the value of storage when erased
132  *
133  * If get_erase_value returns a non-negative byte value, the underlying
134  * storage is set to that value when erased, and storage containing
135  * that value can be programmed without another erase.
136  *
137  * @return The value of storage when erased, or -1 if you can't
138  * rely on the value of erased storage
139  */
140  virtual int get_erase_value() const;
141 
142  /** Get the total size of the underlying device
143  *
144  * @return Size of the underlying device in bytes
145  */
146  virtual bd_size_t size() const;
147 
148  /** Get the BlockDevice class type.
149  *
150  * @return A string represent the BlockDevice class type.
151  */
152  virtual const char *get_type() const;
153 
154  /** Convenience function for checking block program validity
155  *
156  * @param addr Address of block to begin writing to
157  * @param size Size to write in bytes
158  * @return True if program is valid for underlying block device
159  */
160  virtual bool is_valid_program(bd_addr_t addr, bd_size_t size) const;
161 
162  /** Convenience function for checking block read validity
163  *
164  * @param addr Address of block to begin reading from
165  * @param size Size to read in bytes
166  * @return True if read is valid for underlying block device
167  */
168  virtual bool is_valid_read(bd_addr_t addr, bd_size_t size) const;
169 
170  /** Convenience function for checking block erase validity
171  *
172  * @param addr Address of block to begin erasing
173  * @param size Size to erase in bytes
174  * @return True if erase is valid for underlying block device
175  */
176  virtual bool is_valid_erase(bd_addr_t addr, bd_size_t size) const;
177 
178 
179 protected:
180  BlockDevice *_bd;
181  bool _start_from_end;
182  bd_size_t _start;
183  bool _stop_from_end;
184  bd_size_t _stop;
185 };
186 
187 } // namespace mbed
188 
189 // Added "using" for backwards compatibility
190 #ifndef MBED_NO_GLOBAL_USING_DIRECTIVE
192 #endif
193 
194 #endif
195 
196 /** @}*/
virtual ~SlicingBlockDevice()
Lifetime of a block device.
virtual bd_size_t get_program_size() const
Get the size of a programmable block.
virtual bool is_valid_read(bd_addr_t addr, bd_size_t size) const
Convenience function for checking block read validity.
A hardware device capable of writing and reading blocks.
Definition: BlockDevice.h:48
virtual bool is_valid_erase(bd_addr_t addr, bd_size_t size) const
Convenience function for checking block erase validity.
virtual bool is_valid_program(bd_addr_t addr, bd_size_t size) const
Convenience function for checking block program validity.
virtual const char * get_type() const
Get the BlockDevice class type.
virtual bd_size_t get_erase_size() const
Get the size of an erasable block.
virtual int sync()
Ensure data on storage is in sync with the driver.
virtual int deinit()
Deinitialize a block device.
virtual bd_size_t size() const
Get the total size of the underlying device.
SlicingBlockDevice(BlockDevice *bd, bd_addr_t start, bd_addr_t end=0)
Lifetime of the memory block device.
virtual int read(void *buffer, bd_addr_t addr, bd_size_t size)
Read blocks from a block device.
virtual int program(const void *buffer, bd_addr_t addr, bd_size_t size)
Program blocks to a block device.
virtual int erase(bd_addr_t addr, bd_size_t size)
Erase blocks on a block device.
virtual int get_erase_value() const
Get the value of storage when erased.
Definition: ATHandler.h:46
virtual int init()
Initialize a block device.
Block device for mapping to a slice of another block device.
virtual bd_size_t get_read_size() const
Get the size of a readable block.
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