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/*****************************************************************************/
/**
*
* @file intg_ecc_test.c
*
* This file contains the design example for using NAND driver (XNandPsu).
* This example tests the erase, read and write feature of the controller
* in the spare bytes region.The flash is erased and written. The data is
* read back and compared with the data written for correctness.
*
* @note None.
*
*
* <pre>
*
* MODIFICATION HISTORY:
*
* Ver   Who    Date	 Changes
* ----- -----  -------- -----------------------------------------------
* 1.0   sb    11/28/2014 First release
*
*
* </pre>
*
******************************************************************************/

/***************************** Include Files ********************************/

#include "intg.h"

/************************** Constant Definitions ****************************/

/**************************** Type Definitions ******************************/

/***************** Macros (Inline Functions) Definitions ********************/

/************************** Variable Definitions ****************************/

/************************** Function Prototypes *****************************/
s32 Ecc_Test(XNandPsu * NandInstPtr);
/************************** Function Definitions ****************************/

/****************************************************************************/
/**
*
* Entry point to call the ECC  R/W test.
*
* @param	NandInstPtr - Instance to the nand driver.
* @param	TestLoops - Number of tests to execute.
*
* @return   Number of test failures.
*
* @note	 None.
*
*****************************************************************************/
int Intg_EccTest(XNandPsu * NandInstPtr, int TestLoops)
{

	s32 Status = XST_FAILURE;
	CT_TestReset("Module Ecc Error Check test");

	while(TestLoops--) {
		Status = Ecc_Test(NandInstPtr);
		if (Status != XST_SUCCESS) {
			CT_LOG_FAILURE("Ecc Error Check Test Failed with "
					"%d mismatches\r\n", MismatchCounter);
			break;
		}
		CT_NotifyNextPass();
	}

	return(CT_GetTestFailures());
}

/****************************************************************************/
/**
*
* This function runs a test on the NAND flash device using the basic driver
* functions in polled mode.
* The function does the following tasks:
*	- Erase the flash.
*	- Write data to the flash.
*	- Read back the data from the flash.
*	- Compare the data read against the data Written.
*	- Corrupt data by writing random data to flash
*	- Read back the data from the flash.
*	- Compare the data read against the data Written before corruption.
*
* @param	NandInstPtr - Instance to the nand driver.
*
* @return
*		- XST_SUCCESS if successful.
*		- XST_FAILURE if failed.
*
* @note
*		None
*
****************************************************************************/
s32 Ecc_Test(XNandPsu * NandInstPtr)
{
	s32 Status = XST_FAILURE;
	u32 Index;
	u64 Offset;
	u32 Length;
	s32 i;
	MismatchCounter = 0;
	NandInstPtr->BCH_Error_Status = 0;

	Offset = (u64)(TEST_PAGE_START * NandInstPtr->Geometry.BytesPerPage);
	Length = NandInstPtr->Geometry.BytesPerPage;

	/*
	 * Initialize the write buffer
	 */
	for (Index = 0; Index < Length;Index++) {
		WriteBuffer[Index] = (u8)0;
	}

	/*
	 * Enable ECC
	 */
	XNandPsu_EnableEccMode(NandInstPtr);

	/*
	 * Erase the flash
	 */
	Status = XNandPsu_Erase(NandInstPtr, (u64)Offset, (u64)Length);
	if (Status != XST_SUCCESS) {
		goto Out;
	}

	/*
	 * Write to flash
	 */
	Status = XNandPsu_Write(NandInstPtr, (u64)Offset, (u64)Length,
						&WriteBuffer[0]);
	if (Status != XST_SUCCESS) {
		goto Out;
	}

	/*
	 * Read the flash after writing
	 */
	Status = XNandPsu_Read(NandInstPtr, (u64)Offset, (u64)Length,
						&ReadBuffer[0]);
	if (Status != XST_SUCCESS) {
		goto Out;
	}

	/*
	 * Compare the results
	 */
	for (Index = 0U; Index < Length;Index++) {
		if (ReadBuffer[Index] != WriteBuffer[Index]) {
			MismatchCounter++;
			Status = XST_FAILURE;
		}
	}

	for (i = 0 ; i<24 ; i++){
		/*
		 * Disable ECC
		 */
		XNandPsu_DisableEccMode(NandInstPtr);

		/*
		 * Corrupting data in Write buffer
		 */
		WriteBuffer[i] = (u8)(i+1);

		/*
		 * Write to flash
		 */
		Status = XNandPsu_Write(NandInstPtr, (u64)Offset, (u64)Length,
						&WriteBuffer[0]);
		if (Status != XST_SUCCESS) {
			goto Out;
		}

		/*
		 * Correcting back data in Write buffer
		 */
		WriteBuffer[i] = (u8)0;

		/*
		 * Enable ECC check
		 */
		XNandPsu_EnableEccMode(NandInstPtr);

		/*
		 * Read the flash after writing
		 */
		Status = XNandPsu_Read(NandInstPtr, (u64)Offset, (u64)Length,
						&ReadBuffer[0]);
		if (Status != XST_SUCCESS) {
			goto Out;
		}

		/*
		 * Compare the results
		 */
		for (Index = 0U; Index < Length;Index++) {
			if (ReadBuffer[Index] != WriteBuffer[Index]) {
				MismatchCounter++;
				Status = XST_FAILURE;
			}
		}
	}
	xil_printf("Total BCH ECC errors = %d\r\n",NandInstPtr->BCH_Error_Status);

Out:
	return Status;
}