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https://github.com/eclipse-threadx/levelx.git
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Xiuwen Cai
a8bc412907
075bb4c Update patch version. a30e30b Update version and date for release. a6b42b2 Update owners 6a3e60b Add user extension in flash control block
246 lines
10 KiB
C
246 lines
10 KiB
C
/**************************************************************************/
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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 LX_DISABLE_ERROR_CHECKING
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#define LX_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_sector_read PORTABLE C */
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/* 6.2.1 */
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/* AUTHOR */
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/* */
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/* Xiuwen Cai, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This function reads a logical sector from NAND flash. */
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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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/* logical_sector Logical sector number */
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/* buffer Pointer to buffer to read into*/
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/* (the size is number of */
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/* bytes in a page) */
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/* */
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/* OUTPUT */
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/* */
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/* return status */
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/* */
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/* CALLS */
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/* */
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/* _lx_nand_flash_block_find Find the mapped block */
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/* lx_nand_flash_driver_pages_read Read pages */
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/* _lx_nand_flash_system_error Internal system error handler */
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/* tx_mutex_get Get thread protection */
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/* tx_mutex_put Release thread protection */
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/* */
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/* CALLED BY */
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/* */
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/* Application Code */
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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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/* 03-08-2023 Xiuwen Cai Initial Version 6.2.1 */
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/* */
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/**************************************************************************/
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UINT _lx_nand_flash_sector_read(LX_NAND_FLASH *nand_flash, ULONG logical_sector, VOID *buffer)
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{
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UINT status;
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ULONG i;
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ULONG *word_ptr;
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ULONG block;
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USHORT block_status;
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UCHAR *spare_buffer_ptr;
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ULONG available_pages;
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LONG page;
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#ifdef LX_THREAD_SAFE_ENABLE
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/* Obtain the thread safe mutex. */
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tx_mutex_get(&nand_flash -> lx_nand_flash_mutex, TX_WAIT_FOREVER);
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#endif
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/* Increment the number of read requests. */
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nand_flash -> lx_nand_flash_diagnostic_sector_read_requests++;
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/* See if we can find the sector in the current mapping. */
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status = _lx_nand_flash_block_find(nand_flash, logical_sector, &block, &block_status);
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/* Check return status. */
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if (status != LX_SUCCESS)
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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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#ifdef LX_THREAD_SAFE_ENABLE
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/* Release the thread safe mutex. */
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tx_mutex_put(&nand_flash -> lx_nand_flash_mutex);
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#endif
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/* Return an error. */
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return(LX_ERROR);
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}
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}
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/* Determine if the block is mapped. */
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if (block != LX_NAND_BLOCK_UNMAPPED)
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{
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/* Setup spare buffer pointer. */
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spare_buffer_ptr = (UCHAR*)nand_flash -> lx_nand_flash_page_buffer;
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/* Get available pages in this block. */
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available_pages = block_status & LX_NAND_BLOCK_STATUS_FULL ? nand_flash -> lx_nand_flash_pages_per_block : block_status & LX_NAND_BLOCK_STATUS_PAGE_NUMBER_MASK;
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/* Determine if the pages are recorded sequentially. */
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if (block_status & LX_NAND_BLOCK_STATUS_NON_SEQUENTIAL)
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{
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/* Loop to search the logical page. */
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for (page = (LONG)available_pages - 1; page >= 0; page--)
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{
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/* Read a page. */
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#ifdef LX_NAND_ENABLE_CONTROL_BLOCK_FOR_DRIVER_INTERFACE
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status = (nand_flash -> lx_nand_flash_driver_pages_read)(nand_flash, block, (ULONG)page, (UCHAR*)buffer, spare_buffer_ptr, 1);
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#else
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status = (nand_flash -> lx_nand_flash_driver_pages_read)(block, (ULONG)page, (UCHAR*)buffer, spare_buffer_ptr, 1);
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#endif
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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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#ifdef LX_THREAD_SAFE_ENABLE
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/* Release the thread safe mutex. */
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tx_mutex_put(&nand_flash -> lx_nand_flash_mutex);
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#endif
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/* Return an error. */
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return(LX_ERROR);
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}
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/* Get the logical sector number from spare bytes, and check if it matches the addressed sector number. */
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if ((LX_UTILITY_LONG_GET(&spare_buffer_ptr[nand_flash -> lx_nand_flash_spare_data1_offset]) & LX_NAND_PAGE_TYPE_USER_DATA_MASK) == logical_sector)
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{
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#ifdef LX_THREAD_SAFE_ENABLE
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/* Release the thread safe mutex. */
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tx_mutex_put(&nand_flash -> lx_nand_flash_mutex);
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#endif
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/* Return successful completion. */
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return(LX_SUCCESS);
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}
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}
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}
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else
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{
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/* Check if the logical sector is available. */
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if (logical_sector % nand_flash -> lx_nand_flash_pages_per_block < available_pages)
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{
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/* Read a page. */
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#ifdef LX_NAND_ENABLE_CONTROL_BLOCK_FOR_DRIVER_INTERFACE
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status = (nand_flash -> lx_nand_flash_driver_pages_read)(nand_flash, block, logical_sector % nand_flash -> lx_nand_flash_pages_per_block, (UCHAR*)buffer, spare_buffer_ptr, 1);
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#else
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status = (nand_flash -> lx_nand_flash_driver_pages_read)(block, logical_sector % nand_flash -> lx_nand_flash_pages_per_block, (UCHAR*)buffer, spare_buffer_ptr, 1);
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#endif
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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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#ifdef LX_THREAD_SAFE_ENABLE
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/* Release the thread safe mutex. */
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tx_mutex_put(&nand_flash -> lx_nand_flash_mutex);
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#endif
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/* Return an error. */
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return(LX_ERROR);
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}
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#ifdef LX_THREAD_SAFE_ENABLE
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/* Release the thread safe mutex. */
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tx_mutex_put(&nand_flash -> lx_nand_flash_mutex);
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#endif
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/* Return successful completion. */
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return(LX_SUCCESS);
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}
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}
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}
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/* Sector hasn't been written. Simply fill the destination buffer with ones and return success. */
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/* Setup pointer to users buffer. */
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word_ptr = (ULONG *) buffer;
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/* Put all ones in he buffer. */
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for (i = 0; i < nand_flash -> lx_nand_flash_words_per_page; i++)
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{
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/* Copy a word. */
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*word_ptr++ = LX_ALL_ONES;
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}
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/* Set the status to success. */
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status = LX_SUCCESS;
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#ifdef LX_THREAD_SAFE_ENABLE
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/* Release the thread safe mutex. */
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tx_mutex_put(&nand_flash -> lx_nand_flash_mutex);
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#endif
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/* Return status. */
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return(status);
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}
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