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

Source file repositories/reference/linux-study-clean/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c

File Facts

System
Linux kernel
Corpus path
drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
Extension
.c
Size
3983 bytes
Lines
160
Domain
Driver Families
Bucket
drivers/mtd
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * JZ47xx ECC common code
 *
 * Copyright (c) 2015 Imagination Technologies
 * Author: Alex Smith <alex.smith@imgtec.com>
 */

#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)
{
	return ecc->ops->calculate(ecc, params, buf, 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)
{
	return ecc->ops->correct(ecc, params, buf, 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)
{
	struct platform_device *pdev;
	struct ingenic_ecc *ecc;

	pdev = of_find_device_by_node(np);
	if (!pdev)
		return ERR_PTR(-EPROBE_DEFER);

	if (!platform_get_drvdata(pdev)) {
		put_device(&pdev->dev);
		return ERR_PTR(-EPROBE_DEFER);
	}

	ecc = platform_get_drvdata(pdev);
	clk_prepare_enable(ecc->clk);

	return ecc;
}

/**
 * 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

Annotation

Implementation Notes