linux/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c

// SPDX-License-Identifier: GPL-2.0
/*
 * JZ47xx ECC common code
 *
 * Copyright (c) 2015 Imagination Technologies
 * Author: Alex Smith <[email protected]>
 */

#include <linux/clk.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>

#include "ingenic_ecc.h"

/**
 * ingenic_ecc_calculate() - calculate ECC for a data buffer
 * @ecc: ECC device.
 * @params: ECC parameters.
 * @buf: input buffer with raw data.
 * @ecc_code: output buffer with ECC.
 *
 * Return: 0 on success, -ETIMEDOUT if timed out while waiting for ECC
 * controller.
 */
int ingenic_ecc_calculate(struct ingenic_ecc *ecc,
			  struct ingenic_ecc_params *params,
			  const u8 *buf, u8 *ecc_code)
{ … }

/**
 * ingenic_ecc_correct() - detect and correct bit errors
 * @ecc: ECC device.
 * @params: ECC parameters.
 * @buf: raw data read from the chip.
 * @ecc_code: ECC read from the chip.
 *
 * Given the raw data and the ECC read from the NAND device, detects and
 * corrects errors in the data.
 *
 * Return: the number of bit errors corrected, -EBADMSG if there are too many
 * errors to correct or -ETIMEDOUT if we timed out waiting for the controller.
 */
int ingenic_ecc_correct(struct ingenic_ecc *ecc,
			struct ingenic_ecc_params *params,
			u8 *buf, u8 *ecc_code)
{ … }

/**
 * ingenic_ecc_get() - get the ECC controller device
 * @np: ECC device tree node.
 *
 * Gets the ECC controller device from the specified device tree node. The
 * device must be released with ingenic_ecc_release() when it is no longer being
 * used.
 *
 * Return: a pointer to ingenic_ecc, errors are encoded into the pointer.
 * PTR_ERR(-EPROBE_DEFER) if the device hasn't been initialised yet.
 */
static struct ingenic_ecc *ingenic_ecc_get(struct device_node *np)
{ … }

/**
 * of_ingenic_ecc_get() - get the ECC controller from a DT node
 * @of_node: the node that contains an ecc-engine property.
 *
 * Get the ecc-engine property from the given device tree
 * node and pass it to ingenic_ecc_get to do the work.
 *
 * Return: a pointer to ingenic_ecc, errors are encoded into the pointer.
 * PTR_ERR(-EPROBE_DEFER) if the device hasn't been initialised yet.
 */
struct ingenic_ecc *of_ingenic_ecc_get(struct device_node *of_node)
{ … }

/**
 * ingenic_ecc_release() - release the ECC controller device
 * @ecc: ECC device.
 */
void ingenic_ecc_release(struct ingenic_ecc *ecc)
{ … }

int ingenic_ecc_probe(struct platform_device *pdev)
{ … }
EXPORT_SYMBOL(…);