nand_flash_ecc_sw.c File Reference

ECC flash operation.

This file contains definitions and functions for ECC NAND Flash operation.

Copyright (c) 2012-2018 Microchip Technology Inc. and its subsidiaries.

#include <string.h>
#include "nand_flash_ecc.h"
#include "ecc-sw.h"

Macros
#define	MODEL(ecc)   ((struct nand_flash_model *)ecc)
#define	RAW(ecc)   ((struct nand_flash_raw *)ecc)

Functions
uint32_t	nand_flash_ecc_initialize (struct nand_flash_ecc *ecc, const struct nand_flash_model *model, uint32_t command_address, uint32_t address_address, uint32_t data_address)
	Initialize a nand_flash_ecc instance. More...
uint32_t	nand_flash_ecc_read_page (const struct nand_flash_ecc *ecc, uint16_t block, uint16_t page, uint8_t *data, uint8_t *spare)
	Read the data and/or spare of a page of a NAND Flash chip, and verify that the data is valid using the ECC information contained in the spare. More...
uint32_t	nand_flash_ecc_write_page (const struct nand_flash_ecc *ecc, uint16_t block, uint16_t page, uint8_t *data, uint8_t *spare)
	Write the data and/or spare area of a NAND Flash page, after calculating an ECC for the data area and storing it in the spare. More...

#define MODEL

(

ecc

)

((struct nand_flash_model *)ecc)

Referenced by nand_flash_ecc_read_page(), and nand_flash_ecc_write_page().

#define RAW

(

ecc

)

((struct nand_flash_raw *)ecc)

Referenced by nand_flash_ecc_initialize(), nand_flash_ecc_read_page(), and nand_flash_ecc_write_page().

uint32_t nand_flash_ecc_initialize	(	struct nand_flash_ecc *	ecc,
		const struct nand_flash_model *	model,
		uint32_t	command_address,
		uint32_t	address_address,
		uint32_t	data_address
	)

Initialize a nand_flash_ecc instance.

Parameters

ecc	Pointer to an nand_flash_ecc instance.
model	Pointer to the underlying NAND chip model. Can be 0.
command_address	Address at which commands are sent.
address_address	Address at which addresses are sent.
data_address	Address at which data is sent.

Returns

0 if the initialization is done; or return the error code.

References nand_flash_raw_initialize(), and RAW.

uint32_t nand_flash_ecc_read_page	(	const struct nand_flash_ecc *	ecc,
		uint16_t	block,
		uint16_t	page,
		uint8_t *	data,
		uint8_t *	spare
	)

Read the data and/or spare of a page of a NAND Flash chip, and verify that the data is valid using the ECC information contained in the spare.

If one buffer pointer is 0, the corresponding area is not saved.

Parameters

ecc	Pointer to an nand_flash_ecc instance.
block	Number of block to read from.
page	Number of page to read inside given block.
data	Data area buffer.
spare	Spare area buffer.

Returns

0 if the data has been read and is valid; otherwise returns either NAND_COMMON_ERROR_CORRUPTEDDATA or ...

References error(), HAMMING_ERROR_SINGLE_BIT, hamming_verify_256x(), MODEL, NAND_COMMON_ERROR_CORRUPTEDDATA, NAND_COMMON_MAX_PAGE_SPARE_SIZE, NAND_COMMON_MAX_SPARE_ECC_BYTES, nand_flash_model_get_page_data_size(), nand_flash_model_get_scheme(), nand_flash_raw_read_page(), nand_flash_spare_scheme_read_ecc(), RAW, and spare_buffer.

Referenced by run_test_software_ecc().

uint32_t nand_flash_ecc_write_page	(	const struct nand_flash_ecc *	ecc,
		uint16_t	block,
		uint16_t	page,
		uint8_t *	data,
		uint8_t *	spare
	)

Write the data and/or spare area of a NAND Flash page, after calculating an ECC for the data area and storing it in the spare.

If no data buffer is provided, the ECC is read from the existing page spare. If no spare buffer is provided, the spare area is still written with the ECC information calculated on the data buffer.

Parameters

ecc	Pointer to an nand_flash_ecc instance.
block	Number of block to read from.
page	Number of page to read inside given block.
data	Data area buffer.
spare	Spare area buffer.

Returns

0 if successful; otherwise return the error code.

Compute ECC on the new data, if provided. If not provided, hamming code set to 0xFFFF.. to keep existing bytes.

References error(), hamming_compute_256x(), MODEL, NAND_COMMON_MAX_PAGE_SPARE_SIZE, NAND_COMMON_MAX_SPARE_ECC_BYTES, nand_flash_model_get_page_data_size(), nand_flash_model_get_scheme(), nand_flash_raw_write_page(), nand_flash_spare_scheme_write_ecc(), RAW, and spare_buffer.

Referenced by run_test_software_ecc().