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/******************************************************************************
* Copyright (C) 2015 - 2022 Xilinx, Inc. All rights reserved.
* SPDX-License-Identifier: MIT
******************************************************************************/
/*****************************************************************************/
/**
*
* @file xnandpsu_onfi.c
* @addtogroup nandpsu_v1_10
* @{
*
* This file contains the implementation of ONFI specific functions.
*
* @note None
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ---- ---------- -----------------------------------------------
* 1.0 nm 05/06/2014 First release
* </pre>
*
******************************************************************************/
/***************************** Include Files *********************************/
#include "xnandpsu_onfi.h"
#include "xnandpsu.h"
/************************** Constant Definitions *****************************/
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
/*****************************************************************************/
/**
*
* This function calculates ONFI parameter page CRC.
*
* @param ParamBuf is a pointer to the ONFI parameter page buffer.
* @param StartOff is the starting offset in buffer to calculate CRC.
* @param Length is the number of bytes for which CRC is calculated.
*
* @return
* CRC value.
* @note
* None.
*
******************************************************************************/
u32 XNandPsu_OnfiParamPageCrc(u8 *ParamBuf, u32 StartOff, u32 Length)
{
const u32 CrcInit = 0x4F4EU;
const u32 Order = 16U;
const u32 Polynom = 0x8005U;
u32 i, j, c, Bit;
u32 Crc = CrcInit;
u32 DataIn;
u32 DataByteCount = 0U;
u32 CrcMask, CrcHighBit;
CrcMask = ((u32)(((u32)1 << (Order - (u32)1)) -(u32)1) << (u32)1) | (u32)1;
CrcHighBit = (u32)((u32)1 << (Order - (u32)1));
/*
* CRC covers the data bytes between byte 0 and byte 253
* (ONFI 1.0, section 5.4.1.36)
*/
for(i = StartOff; i < Length; i++) {
DataIn = *(ParamBuf + i);
c = (u32)DataIn;
DataByteCount++;
j = 0x80U;
while(j != 0U) {
Bit = Crc & CrcHighBit;
Crc <<= 1U;
if ((c & j) != 0U) {
Bit ^= CrcHighBit;
}
if (Bit != 0U) {
Crc ^= Polynom;
}
j >>= 1U;
}
Crc &= CrcMask;
}
return Crc;
}
/** @} */
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