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mbed-os/features/filesystem/bd/ExhaustibleBlockDevice.cpp@4:75df35ef4fb6, 2018-03-30 (annotated)

Committer:
borlanic
Date:
Fri Mar 30 14:07:05 2018 +0000
Revision:
4:75df35ef4fb6
Parent:
0:380207fcb5c1 
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borlanic 0:380207fcb5c1 1 /* mbed Microcontroller Library
borlanic 0:380207fcb5c1 2 * Copyright (c) 2017 ARM Limited
borlanic 0:380207fcb5c1 3 *
borlanic 0:380207fcb5c1 4 * Licensed under the Apache License, Version 2.0 (the "License");
borlanic 0:380207fcb5c1 5 * you may not use this file except in compliance with the License.
borlanic 0:380207fcb5c1 6 * You may obtain a copy of the License at
borlanic 0:380207fcb5c1 7 *
borlanic 0:380207fcb5c1 8 * http://www.apache.org/licenses/LICENSE-2.0
borlanic 0:380207fcb5c1 9 *
borlanic 0:380207fcb5c1 10 * Unless required by applicable law or agreed to in writing, software
borlanic 0:380207fcb5c1 11 * distributed under the License is distributed on an "AS IS" BASIS,
borlanic 0:380207fcb5c1 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
borlanic 0:380207fcb5c1 13 * See the License for the specific language governing permissions and
borlanic 0:380207fcb5c1 14 * limitations under the License.
borlanic 0:380207fcb5c1 15 */
borlanic 0:380207fcb5c1 16
borlanic 0:380207fcb5c1 17 #include "ExhaustibleBlockDevice.h"
borlanic 0:380207fcb5c1 18 #include "mbed.h"
borlanic 0:380207fcb5c1 19
borlanic 0:380207fcb5c1 20
borlanic 0:380207fcb5c1 21 ExhaustibleBlockDevice::ExhaustibleBlockDevice(BlockDevice *bd, uint32_t erase_cycles)
borlanic 0:380207fcb5c1 22 : _bd(bd), _erase_array(NULL), _erase_cycles(erase_cycles)
borlanic 0:380207fcb5c1 23 {
borlanic 0:380207fcb5c1 24 }
borlanic 0:380207fcb5c1 25
borlanic 0:380207fcb5c1 26 ExhaustibleBlockDevice::~ExhaustibleBlockDevice()
borlanic 0:380207fcb5c1 27 {
borlanic 0:380207fcb5c1 28 delete[] _erase_array;
borlanic 0:380207fcb5c1 29 }
borlanic 0:380207fcb5c1 30
borlanic 0:380207fcb5c1 31 int ExhaustibleBlockDevice::init()
borlanic 0:380207fcb5c1 32 {
borlanic 0:380207fcb5c1 33 int err = _bd->init();
borlanic 0:380207fcb5c1 34 if (err) {
borlanic 0:380207fcb5c1 35 return err;
borlanic 0:380207fcb5c1 36 }
borlanic 0:380207fcb5c1 37
borlanic 0:380207fcb5c1 38 if (!_erase_array) {
borlanic 0:380207fcb5c1 39 // can only be allocated after initialization
borlanic 0:380207fcb5c1 40 _erase_array = new uint32_t[_bd->size() / _bd->get_erase_size()];
borlanic 0:380207fcb5c1 41 for (size_t i = 0; i < _bd->size() / _bd->get_erase_size(); i++) {
borlanic 0:380207fcb5c1 42 _erase_array[i] = _erase_cycles;
borlanic 0:380207fcb5c1 43 }
borlanic 0:380207fcb5c1 44 }
borlanic 0:380207fcb5c1 45
borlanic 0:380207fcb5c1 46 return 0;
borlanic 0:380207fcb5c1 47 }
borlanic 0:380207fcb5c1 48
borlanic 0:380207fcb5c1 49 int ExhaustibleBlockDevice::deinit()
borlanic 0:380207fcb5c1 50 {
borlanic 0:380207fcb5c1 51 // _erase_array is lazily cleaned up in destructor to allow
borlanic 0:380207fcb5c1 52 // data to live across de/reinitialization
borlanic 0:380207fcb5c1 53 return _bd->deinit();
borlanic 0:380207fcb5c1 54 }
borlanic 0:380207fcb5c1 55
borlanic 0:380207fcb5c1 56 int ExhaustibleBlockDevice::sync()
borlanic 0:380207fcb5c1 57 {
borlanic 0:380207fcb5c1 58 return _bd->sync();
borlanic 0:380207fcb5c1 59 }
borlanic 0:380207fcb5c1 60
borlanic 0:380207fcb5c1 61 int ExhaustibleBlockDevice::read(void *buffer, bd_addr_t addr, bd_size_t size)
borlanic 0:380207fcb5c1 62 {
borlanic 0:380207fcb5c1 63 return _bd->read(buffer, addr, size);
borlanic 0:380207fcb5c1 64 }
borlanic 0:380207fcb5c1 65
borlanic 0:380207fcb5c1 66 int ExhaustibleBlockDevice::program(const void *buffer, bd_addr_t addr, bd_size_t size)
borlanic 0:380207fcb5c1 67 {
borlanic 0:380207fcb5c1 68 MBED_ASSERT(is_valid_program(addr, size));
borlanic 0:380207fcb5c1 69
borlanic 0:380207fcb5c1 70 if (_erase_array[addr / get_erase_size()] == 0) {
borlanic 0:380207fcb5c1 71 // TODO possibly something more destructive here
borlanic 0:380207fcb5c1 72 return 0;
borlanic 0:380207fcb5c1 73 }
borlanic 0:380207fcb5c1 74
borlanic 0:380207fcb5c1 75 return _bd->program(buffer, addr, size);
borlanic 0:380207fcb5c1 76 }
borlanic 0:380207fcb5c1 77
borlanic 0:380207fcb5c1 78 int ExhaustibleBlockDevice::erase(bd_addr_t addr, bd_size_t size)
borlanic 0:380207fcb5c1 79 {
borlanic 0:380207fcb5c1 80 MBED_ASSERT(is_valid_erase(addr, size));
borlanic 0:380207fcb5c1 81
borlanic 0:380207fcb5c1 82 // use an erase cycle
borlanic 0:380207fcb5c1 83 if (_erase_array[addr / get_erase_size()] > 0) {
borlanic 0:380207fcb5c1 84 _erase_array[addr / get_erase_size()] -= 1;
borlanic 0:380207fcb5c1 85 }
borlanic 0:380207fcb5c1 86
borlanic 0:380207fcb5c1 87 if (_erase_array[addr / get_erase_size()] == 0) {
borlanic 0:380207fcb5c1 88 // TODO possibly something more destructive here
borlanic 0:380207fcb5c1 89 return 0;
borlanic 0:380207fcb5c1 90 }
borlanic 0:380207fcb5c1 91
borlanic 0:380207fcb5c1 92 return _bd->erase(addr, size);
borlanic 0:380207fcb5c1 93 }
borlanic 0:380207fcb5c1 94
borlanic 0:380207fcb5c1 95 bd_size_t ExhaustibleBlockDevice::get_read_size() const
borlanic 0:380207fcb5c1 96 {
borlanic 0:380207fcb5c1 97 return _bd->get_read_size();
borlanic 0:380207fcb5c1 98 }
borlanic 0:380207fcb5c1 99
borlanic 0:380207fcb5c1 100 bd_size_t ExhaustibleBlockDevice::get_program_size() const
borlanic 0:380207fcb5c1 101 {
borlanic 0:380207fcb5c1 102 return _bd->get_program_size();
borlanic 0:380207fcb5c1 103 }
borlanic 0:380207fcb5c1 104
borlanic 0:380207fcb5c1 105 bd_size_t ExhaustibleBlockDevice::get_erase_size() const
borlanic 0:380207fcb5c1 106 {
borlanic 0:380207fcb5c1 107 return _bd->get_erase_size();
borlanic 0:380207fcb5c1 108 }
borlanic 0:380207fcb5c1 109
borlanic 4:75df35ef4fb6 110 bd_size_t ExhaustibleBlockDevice::get_erase_size(bd_addr_t addr) const
borlanic 4:75df35ef4fb6 111 {
borlanic 4:75df35ef4fb6 112 return _bd->get_erase_size(addr);
borlanic 4:75df35ef4fb6 113 }
borlanic 4:75df35ef4fb6 114
borlanic 0:380207fcb5c1 115 int ExhaustibleBlockDevice::get_erase_value() const
borlanic 0:380207fcb5c1 116 {
borlanic 0:380207fcb5c1 117 return _bd->get_erase_value();
borlanic 0:380207fcb5c1 118 }
borlanic 0:380207fcb5c1 119
borlanic 0:380207fcb5c1 120 bd_size_t ExhaustibleBlockDevice::size() const
borlanic 0:380207fcb5c1 121 {
borlanic 0:380207fcb5c1 122 return _bd->size();
borlanic 0:380207fcb5c1 123 }