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2020-05-11 08:49:43 -06:00
commit 6f4ea0561f
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common/src/lx_nand_flash_driver_extra_bytes_get.c
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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** LevelX Component */
/** */
/** NAND Flash */
/** */
/**************************************************************************/
/**************************************************************************/
#define LX_SOURCE_CODE
/* Disable ThreadX error checking. */
#ifndef TX_DISABLE_ERROR_CHECKING
#define TX_DISABLE_ERROR_CHECKING
#endif
/* Include necessary system files. */
#include "lx_api.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _lx_nand_flash_driver_extra_bytes_get PORTABLE C */
/* 6.0 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function calls the driver to get the extra bytes of a NAND */
/* page. */
/* */
/* INPUT */
/* */
/* nand_flash NAND flash instance */
/* block Block number */
/* page Page number */
/* destination Pointer to destination buffer */
/* words Number of words to read */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* (lx_nand_flash_driver_extra_bytes_get)Get extra bytes from spare */
/* */
/* CALLED BY */
/* */
/* Internal LevelX */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* */
/**************************************************************************/
UINT _lx_nand_flash_driver_extra_bytes_get(LX_NAND_FLASH *nand_flash, ULONG block, ULONG page, UCHAR *destination, UINT size)
{
ULONG *source_ptr;
ULONG *destination_ptr;
ULONG cache_index;
UINT status;
/* Determine if the page extra bytes cache is disabled. */
if (nand_flash -> lx_nand_flash_page_extra_bytes_cache == LX_NULL)
{
/* Increment the page extra bytes get count. */
nand_flash -> lx_nand_flash_diagnostic_page_extra_bytes_gets++;
/* Call driver extra bytes get function. */
status = (nand_flash -> lx_nand_flash_driver_extra_bytes_get)(block, page, destination, size);
}
else
{
/* Calculate the cache index. */
cache_index = (block * nand_flash -> lx_nand_flash_pages_per_block) + page;
/* Setup the destination pointer. */
destination_ptr = (ULONG *) destination;
/* Determine if this cache entry is valid. */
if (nand_flash -> lx_nand_flash_page_extra_bytes_cache[cache_index].lx_nand_page_extra_info_logical_sector != 0)
{
/* Simply return this value. */
*destination_ptr = nand_flash -> lx_nand_flash_page_extra_bytes_cache[cache_index].lx_nand_page_extra_info_logical_sector;
/* Increment the number of page extra bytes cache hits. */
nand_flash -> lx_nand_flash_diagnostic_page_extra_bytes_cache_hits++;
/* Return successful status. */
status = LX_SUCCESS;
}
else
{
/* Increment the page extra bytes get count. */
nand_flash -> lx_nand_flash_diagnostic_page_extra_bytes_gets++;
/* Call driver extra bytes get function. */
status = (nand_flash -> lx_nand_flash_driver_extra_bytes_get)(block, page, destination, size);
/* Increment the number of page extra bytes cache misses. */
nand_flash -> lx_nand_flash_diagnostic_page_extra_bytes_cache_misses++;
/* Setup destination pointer. */
destination_ptr = &nand_flash -> lx_nand_flash_page_extra_bytes_cache[cache_index].lx_nand_page_extra_info_logical_sector;
/* Setup source pointer. */
source_ptr = (ULONG *) destination;
/* Save the value in the page extra bytes cache. */
*destination_ptr = *source_ptr;
}
}
/* Return status. */
return(status);
}