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https://github.com/eclipse-threadx/levelx.git
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Initial commit
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/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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/* */
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** LevelX Component */
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/** */
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/** NAND Flash */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define LX_SOURCE_CODE
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/* Disable ThreadX error checking. */
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#ifndef TX_DISABLE_ERROR_CHECKING
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#define TX_DISABLE_ERROR_CHECKING
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#endif
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/* Include necessary system files. */
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#include "lx_api.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _lx_nand_flash_block_obsoleted_check PORTABLE C */
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/* 6.0 */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This function checks to see if the specified block is completely */
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/* obsoleted. If so, the block is reclaimed (erased) and made */
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/* available. */
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/* */
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/* INPUT */
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/* */
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/* nand_flash NAND flash instance */
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/* block Block number to check */
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/* */
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/* OUTPUT */
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/* */
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/* None */
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/* */
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/* CALLS */
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/* */
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/* _lx_nand_flash_driver_block_status_get */
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/* Driver block status */
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/* _lx_nand_flash_driver_block_erase Driver block erase */
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/* _lx_nand_flash_driver_extra_bytes_get Driver get extra bytes */
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/* _lx_nand_flash_driver_block_status_set */
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/* Driver set extra bytes */
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/* _lx_nand_flash_driver_read Driver page read */
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/* _lx_nand_flash_driver_write Driver page write */
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/* _lx_nand_flash_block_reclaim Reclaim one block */
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/* _lx_nand_flash_system_error Internal system error handler */
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/* */
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/* CALLED BY */
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/* */
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/* Internal LevelX */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */
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/* */
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/**************************************************************************/
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VOID _lx_nand_flash_block_obsoleted_check(LX_NAND_FLASH *nand_flash, ULONG block)
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{
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LX_NAND_PAGE_EXTRA_INFO extra_info;
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UCHAR block_status;
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ULONG *page_word_ptr;
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ULONG erase_count;
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ULONG j;
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UINT status;
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/* First, check to make sure this block is good. */
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status = _lx_nand_flash_driver_block_status_get(nand_flash, block, &block_status);
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/* Check for an error from flash driver. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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/* Simply return. */
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return;
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}
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/* Is this block bad? */
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if (block_status != LX_NAND_GOOD_BLOCK)
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{
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/* Yes, this block is bad. */
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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/* Simply return. */
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return;
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}
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/* Read the extra bytes of page 0. This will tell us if the page has any valid mappings. */
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status = _lx_nand_flash_driver_extra_bytes_get(nand_flash, block, 0, (UCHAR *) &extra_info, sizeof(extra_info));
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/* Check for an error from flash driver. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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/* Simply return. */
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return;
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}
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/* Determine if the block is full, since it must be full first before it can be
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completely obsoleted. */
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if ((extra_info.lx_nand_page_extra_info_logical_sector & LX_NAND_BLOCK_FULL) != 0)
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{
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/* This block is not full, therefore it cannot be obsoleted. */
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/* Simply return. */
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return;
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}
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/* Setup pointer to internal buffer. */
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page_word_ptr = nand_flash -> lx_nand_flash_page_buffer;
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/* Now read page 0 of the block, which has the erase count in the first 4 bytes. */
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status = _lx_nand_flash_driver_read(nand_flash, block, 0, page_word_ptr, (nand_flash -> lx_nand_flash_pages_per_block + 1));
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/* Check for an error from flash driver. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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/* Determine if the error is fatal. */
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if (status != LX_NAND_ERROR_CORRECTED)
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{
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/* Simply return. */
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return;
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}
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}
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/* Determine if we have a valid logical sector mapping list. */
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if ((page_word_ptr[1] != LX_NAND_PAGE_FREE) &&
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(page_word_ptr[nand_flash -> lx_nand_flash_pages_per_block] == LX_NAND_PAGE_LIST_VALID))
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{
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/* Yes, we have a valid logical sector mapping list in page 0. */
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/* Traverse the list to look for the logical sector. */
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for (j = 1; j < nand_flash -> lx_nand_flash_pages_per_block; j++)
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{
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/* Is this entry valid? */
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if (page_word_ptr[j] & LX_NAND_PAGE_VALID)
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{
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/* Read in the actual page entry to make sure this logical sector mapping is still valid. */
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status = _lx_nand_flash_driver_extra_bytes_get(nand_flash, block, j, (UCHAR *) &extra_info, sizeof(extra_info));
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/* Check for an error from flash driver. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, j);
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/* Simply return. */
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return;
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}
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/* Determine if the actual page is still valid. */
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if (extra_info.lx_nand_page_extra_info_logical_sector & LX_NAND_PAGE_VALID)
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{
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/* If so, we found a valid page so the block isn't completely obsoleted. */
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/* Simply return. */
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return;
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}
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}
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}
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/* Pickup the erase count. */
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erase_count = page_word_ptr[0];
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/* Determine if we need to reclaim blocks to balance out the erase counts. */
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if ((erase_count == nand_flash -> lx_nand_flash_maximum_erase_count) &&
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((nand_flash -> lx_nand_flash_maximum_erase_count - nand_flash -> lx_nand_flash_minimum_erase_count) >= LX_NAND_FLASH_MAX_ERASE_COUNT_DELTA))
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{
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/* Attempt to reclaim one block. */
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_lx_nand_flash_block_reclaim(nand_flash);
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}
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else
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{
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/* At this point we can reclaim the block. */
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/* Write the erased started indication. */
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page_word_ptr[0] = LX_BLOCK_ERASE_STARTED;
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status = _lx_nand_flash_driver_write(nand_flash, block, 0, page_word_ptr, LX_NAND_ERASE_COUNT_WRITE_SIZE);
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/* Check for an error from flash driver. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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}
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/* Erase the entire block. */
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status = _lx_nand_flash_driver_block_erase(nand_flash, block, erase_count+1);
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/* Check for an error from flash driver. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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/* Attempt to mark this block as bad. */
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status = _lx_nand_flash_driver_block_status_set(nand_flash, block, LX_NAND_BAD_BLOCK);
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/* Check for error in setting the block status. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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}
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/* Increment the bad block count. */
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nand_flash -> lx_nand_flash_bad_blocks++;
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/* Update number of obsolete pages but not free pages since this block is now bad. */
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nand_flash -> lx_nand_flash_obsolete_pages = nand_flash -> lx_nand_flash_obsolete_pages - (nand_flash -> lx_nand_flash_pages_per_block - 1);
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}
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else
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{
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/* Increment the erase count. */
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erase_count++;
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/* Determine if the new erase count exceeds the maximum. */
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if (erase_count > ((ULONG) LX_BLOCK_ERASE_COUNT_MAX))
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{
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/* Yes, erase count is in overflow. Stay at the maximum count. */
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erase_count = ((ULONG) LX_BLOCK_ERASE_COUNT_MAX);
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}
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/* Determine if we need to update the maximum erase count. */
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if (erase_count > nand_flash -> lx_nand_flash_maximum_erase_count)
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{
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/* Yes, a new maximum is present. */
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nand_flash -> lx_nand_flash_maximum_erase_count = erase_count;
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/* Determine if the search pointer is on this block. */
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if (nand_flash -> lx_nand_flash_free_block_search == block)
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{
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/* Move to next block. */
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nand_flash -> lx_nand_flash_free_block_search++;
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/* Check for wrap condition. */
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if (nand_flash -> lx_nand_flash_free_block_search >= nand_flash -> lx_nand_flash_total_blocks)
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{
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/* Reset to the beginning block. */
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nand_flash -> lx_nand_flash_free_block_search = 0;
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}
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}
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}
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/* Set the buffer to all ones. */
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for (j = 0; j < nand_flash -> lx_nand_flash_words_per_page; j++)
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{
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/* Set word to all ones. */
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page_word_ptr[j] = LX_ALL_ONES;
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}
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/* Now store the erase count. */
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page_word_ptr[0] = (erase_count | LX_BLOCK_ERASED);
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/* Write the erase count for the block. */
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status = _lx_nand_flash_driver_write(nand_flash, block, 0, page_word_ptr, LX_NAND_ERASE_COUNT_WRITE_SIZE);
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/* Check to see if the write was successful. */
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if (status == LX_SUCCESS)
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{
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/* Now store the erase count. */
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page_word_ptr[0] = erase_count;
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/* Write the erase count for the block. */
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status = _lx_nand_flash_driver_write(nand_flash, block, 0, page_word_ptr, LX_NAND_ERASE_COUNT_WRITE_SIZE);
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}
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/* Check for an error from flash driver. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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/* Attempt to mark this block as bad. */
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status = _lx_nand_flash_driver_block_status_set(nand_flash, block, LX_NAND_BAD_BLOCK);
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/* Check for error in setting the block status. */
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if (status)
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{
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/* Call system error handler. */
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_lx_nand_flash_system_error(nand_flash, status, block, 0);
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/* Simply return. */
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return;
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}
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/* Increment the bad block count. */
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nand_flash -> lx_nand_flash_bad_blocks++;
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/* Update number of obsolete pages but not free pages since this block is now bad. */
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nand_flash -> lx_nand_flash_obsolete_pages = nand_flash -> lx_nand_flash_obsolete_pages - (nand_flash -> lx_nand_flash_pages_per_block - 1);
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}
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else
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{
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/* Update parameters of this flash. */
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nand_flash -> lx_nand_flash_free_pages = nand_flash -> lx_nand_flash_free_pages + (nand_flash -> lx_nand_flash_pages_per_block - 1);
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nand_flash -> lx_nand_flash_obsolete_pages = nand_flash -> lx_nand_flash_obsolete_pages - (nand_flash -> lx_nand_flash_pages_per_block - 1);
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}
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}
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}
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}
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}
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