SlicingBlockDevice.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2017 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 
00017 #include "SlicingBlockDevice.h"
00018 #include "platform/mbed_assert.h"
00019 #include "stddef.h"
00020 #include <stdio.h>
00021 
00022 namespace mbed {
00023 
00024 
00025 SlicingBlockDevice::SlicingBlockDevice(BlockDevice *bd, bd_addr_t start, bd_addr_t stop)
00026     : _bd(bd)
00027     , _start_from_end(false), _start(start)
00028     , _stop_from_end(false), _stop(stop)
00029 {
00030     MBED_ASSERT(bd);
00031     // SlicingBlockDevice(bd, 0,0) would use the full block, which does not make sense, it must be a programming eror.
00032     // SlicingBlockDevice(bd, 100,100) would have no size, which is also a programming error.
00033     MBED_ASSERT(start != stop);
00034 
00035     if ((int64_t)_start < 0) {
00036         _start_from_end = true;
00037         _start = -_start;
00038     }
00039 
00040     if ((int64_t)_stop <= 0) {
00041         _stop_from_end = true;
00042         _stop = -_stop;
00043     }
00044 }
00045 
00046 int SlicingBlockDevice::init()
00047 {
00048     int err = _bd->init();
00049     if (err) {
00050         return err;
00051     }
00052 
00053     bd_size_t size = _bd->size();
00054 
00055     // Calculate from_end values
00056     if (_start_from_end) {
00057         _start_from_end = false;
00058         _start = size - _start;
00059     }
00060 
00061     if (_stop_from_end) {
00062         _stop_from_end = false;
00063         _stop = size - _stop;
00064     }
00065 
00066     // Check that block addresses are valid
00067     if (!is_valid_erase(0, _stop - _start)) {
00068         return BD_ERROR_DEVICE_ERROR;
00069     }
00070 
00071     return 0;
00072 }
00073 
00074 int SlicingBlockDevice::deinit()
00075 {
00076     return _bd->deinit();
00077 }
00078 
00079 int SlicingBlockDevice::sync()
00080 {
00081     return _bd->sync();
00082 }
00083 
00084 int SlicingBlockDevice::read(void *b, bd_addr_t addr, bd_size_t size)
00085 {
00086     if (!is_valid_read(addr, size)) {
00087         return BD_ERROR_DEVICE_ERROR;
00088     }
00089     return _bd->read(b, addr + _start, size);
00090 }
00091 
00092 int SlicingBlockDevice::program(const void *b, bd_addr_t addr, bd_size_t size)
00093 {
00094     if (!is_valid_program(addr, size)) {
00095         return BD_ERROR_DEVICE_ERROR;
00096     }
00097     return _bd->program(b, addr + _start, size);
00098 }
00099 
00100 int SlicingBlockDevice::erase(bd_addr_t addr, bd_size_t size)
00101 {
00102     if (!is_valid_erase(addr, size)) {
00103         return BD_ERROR_DEVICE_ERROR;
00104     }
00105     return _bd->erase(addr + _start, size);
00106 }
00107 
00108 bool SlicingBlockDevice::is_valid_read(bd_addr_t addr, bd_size_t size) const
00109 {
00110     return _bd->is_valid_read(_start + addr, size) && _start + addr + size <= _stop;
00111 }
00112 
00113 bool SlicingBlockDevice::is_valid_program(bd_addr_t addr, bd_size_t size) const
00114 {
00115     return _bd->is_valid_program(_start + addr, size) && _start + addr + size <= _stop;
00116 }
00117 
00118 bool SlicingBlockDevice::is_valid_erase(bd_addr_t addr, bd_size_t size) const
00119 {
00120     return _bd->is_valid_erase(_start + addr, size) && _start + addr + size <= _stop;
00121 }
00122 
00123 bd_size_t SlicingBlockDevice::get_read_size() const
00124 {
00125     return _bd->get_read_size();
00126 }
00127 
00128 bd_size_t SlicingBlockDevice::get_program_size() const
00129 {
00130     return _bd->get_program_size();
00131 }
00132 
00133 bd_size_t SlicingBlockDevice::get_erase_size() const
00134 {
00135     return _bd->get_erase_size(_start);
00136 }
00137 
00138 bd_size_t SlicingBlockDevice::get_erase_size(bd_addr_t addr) const
00139 {
00140     return _bd->get_erase_size(_start + addr);
00141 }
00142 
00143 int SlicingBlockDevice::get_erase_value() const
00144 {
00145     return _bd->get_erase_value();
00146 }
00147 
00148 bd_size_t SlicingBlockDevice::size() const
00149 {
00150     return _stop - _start;
00151 }
00152 
00153 const char *SlicingBlockDevice::get_type() const
00154 {
00155     return _bd->get_type();
00156 }
00157 
00158 } // namespace mbed