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// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic NAND driver
*
* Author: Vitaly Wool <vitalywool@gmail.com>
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/platnand.h>
struct plat_nand_data {
struct nand_controller controller;
struct nand_chip chip;
void __iomem *io_base;
};
static int plat_nand_attach_chip(struct nand_chip *chip)
{
if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&
chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)
chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
return 0;
}
static const struct nand_controller_ops plat_nand_ops = {
.attach_chip = plat_nand_attach_chip,
};
/*
* Probe for the NAND device.
*/
static int plat_nand_probe(struct platform_device *pdev)
{
struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
struct plat_nand_data *data;
struct mtd_info *mtd;
const char **part_types;
int err = 0;
if (!pdata) {
dev_err(&pdev->dev, "platform_nand_data is missing\n");
return -EINVAL;
}
if (pdata->chip.nr_chips < 1) {
dev_err(&pdev->dev, "invalid number of chips specified\n");
return -EINVAL;
}
/* Allocate memory for the device structure (and zero it) */
data = devm_kzalloc(&pdev->dev, sizeof(struct plat_nand_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
data->controller.ops = &plat_nand_ops;
nand_controller_init(&data->controller);
data->chip.controller = &data->controller;
data->io_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(data->io_base))
return PTR_ERR(data->io_base);
nand_set_flash_node(&data->chip, pdev->dev.of_node);
mtd = nand_to_mtd(&data->chip);
mtd->dev.parent = &pdev->dev;
data->chip.legacy.IO_ADDR_R = data->io_base;
data->chip.legacy.IO_ADDR_W = data->io_base;
data->chip.legacy.cmd_ctrl = pdata->ctrl.cmd_ctrl;
data->chip.legacy.dev_ready = pdata->ctrl.dev_ready;
data->chip.legacy.select_chip = pdata->ctrl.select_chip;
data->chip.legacy.write_buf = pdata->ctrl.write_buf;
data->chip.legacy.read_buf = pdata->ctrl.read_buf;
data->chip.legacy.chip_delay = pdata->chip.chip_delay;
data->chip.options |= pdata->chip.options;
data->chip.bbt_options |= pdata->chip.bbt_options;
platform_set_drvdata(pdev, data);
/* Handle any platform specific setup */
if (pdata->ctrl.probe) {
err = pdata->ctrl.probe(pdev);
if (err)
goto out;
}
/*
* This driver assumes that the default ECC engine should be TYPE_SOFT.
* Set ->engine_type before registering the NAND devices in order to
* provide a driver specific default value.
*/
data->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
/* Scan to find existence of the device */
err = nand_scan(&data->chip, pdata->chip.nr_chips);
if (err)
goto out;
part_types = pdata->chip.part_probe_types;
err = mtd_device_parse_register(mtd, part_types, NULL,
pdata->chip.partitions,
pdata->chip.nr_partitions);
if (!err)
return err;
nand_cleanup(&data->chip);
out:
if (pdata->ctrl.remove)
pdata->ctrl.remove(pdev);
return err;
}
/*
* Remove a NAND device.
*/
static int plat_nand_remove(struct platform_device *pdev)
{
struct plat_nand_data *data = platform_get_drvdata(pdev);
struct platform_nand_data *pdata = dev_get_platdata(&pdev->dev);
struct nand_chip *chip = &data->chip;
int ret;
ret = mtd_device_unregister(nand_to_mtd(chip));
WARN_ON(ret);
nand_cleanup(chip);
if (pdata->ctrl.remove)
pdata->ctrl.remove(pdev);
return 0;
}
static const struct of_device_id plat_nand_match[] = {
{ .compatible = "gen_nand" },
{},
};
MODULE_DEVICE_TABLE(of, plat_nand_match);
static struct platform_driver plat_nand_driver = {
.probe = plat_nand_probe,
.remove = plat_nand_remove,
.driver = {
.name = "gen_nand",
.of_match_table = plat_nand_match,
},
};
module_platform_driver(plat_nand_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vitaly Wool");
MODULE_DESCRIPTION("Simple generic NAND driver");
MODULE_ALIAS("platform:gen_nand");
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