mirror of
https://github.com/zephyrproject-rtos/zephyr
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ce9f0b571e
Added an internal function to obtain the flash page layout in run-length encoded format. The API is simple and allows the actual public API implementations to be simple and maintainable. This feature can be enabled by using the FLASH_PAGE_LAYOUT Kconfig option. This API is required for the implementation of flash file system. Added a public API to get flash page information (size and start offset) by offset within the flash and by index of the page. Added a generic implementation of the internal flash_get_page_info API. Added an additional public API call to get the total count of pages in the flash memory and its generic implementation. Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
83 lines
1.8 KiB
C
83 lines
1.8 KiB
C
/*
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* Copyright (c) 2017 Nordic Semiconductor ASA
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <flash.h>
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static int _flash_get_page_info(struct device *dev, off_t offs,
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bool use_addr, struct flash_pages_info *info)
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{
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const struct flash_driver_api *api = dev->driver_api;
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const struct flash_pages_layout *layout;
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size_t page_count = 0;
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off_t group_offs = 0;
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u32_t num_in_group;
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off_t end = 0;
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size_t layout_size;
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api->page_layout(dev, &layout, &layout_size);
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while (layout_size--) {
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if (use_addr) {
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end += layout->pages_count * layout->pages_size;
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} else {
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end += layout->pages_count;
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}
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if (offs < end) {
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info->size = layout->pages_size;
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if (use_addr) {
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num_in_group = (offs - group_offs) /
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layout->pages_size;
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} else {
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num_in_group = offs - page_count;
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}
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info->start_offset = group_offs +
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num_in_group * layout->pages_size;
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info->index = page_count + num_in_group;
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return 0;
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}
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group_offs += layout->pages_count * layout->pages_size;
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page_count += layout->pages_count;
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layout++;
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}
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return -EINVAL; /* page of the index doesn't exist */
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}
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int flash_get_page_info_by_offs(struct device *dev, off_t offs,
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struct flash_pages_info *info)
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{
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return _flash_get_page_info(dev, offs, true, info);
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}
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int flash_get_page_info_by_idx(struct device *dev, u32_t page_index,
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struct flash_pages_info *info)
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{
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return _flash_get_page_info(dev, page_index, false, info);
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}
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size_t flash_get_page_count(struct device *dev)
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{
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const struct flash_driver_api *api = dev->driver_api;
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const struct flash_pages_layout *layout;
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size_t layout_size;
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size_t count = 0;
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api->page_layout(dev, &layout, &layout_size);
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while (layout_size--) {
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count += layout->pages_count;
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layout++;
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}
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return count;
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}
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