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/*
* Generic NAND driver
*
* Author: Vitaly Wool <vitalywool@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#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/rawnand.h>
#include <linux/mtd/partitions.h>
struct plat_nand_data {
struct nand_chip chip;
void __iomem *io_base;
};
static void plat_nand_cmd_ctrl(struct mtd_info *mtd, int dat, unsigned int ctrl)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
pdata->ctrl.cmd_ctrl(mtd_to_nand(mtd), dat, ctrl);
}
static int plat_nand_dev_ready(struct mtd_info *mtd)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
return pdata->ctrl.dev_ready(mtd_to_nand(mtd));
}
static void plat_nand_select_chip(struct mtd_info *mtd, int cs)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
pdata->ctrl.select_chip(mtd_to_nand(mtd), cs);
}
static void plat_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
int len)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
pdata->ctrl.write_buf(mtd_to_nand(mtd), buf, len);
}
static void plat_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
{
struct platform_nand_data *pdata = dev_get_platdata(mtd->dev.parent);
pdata->ctrl.read_buf(mtd_to_nand(mtd), buf, len);
}
/*
* 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;
struct resource *res;
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;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->io_base = devm_ioremap_resource(&pdev->dev, res);
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.IO_ADDR_R = data->io_base;
data->chip.IO_ADDR_W = data->io_base;
if (pdata->ctrl.cmd_ctrl)
data->chip.cmd_ctrl = plat_nand_cmd_ctrl;
if (pdata->ctrl.dev_ready)
data->chip.dev_ready = plat_nand_dev_ready;
if (pdata->ctrl.select_chip)
data->chip.select_chip = plat_nand_select_chip;
if (pdata->ctrl.write_buf)
data->chip.write_buf = plat_nand_write_buf;
if (pdata->ctrl.read_buf)
data->chip.read_buf = plat_nand_read_buf;
data->chip.chip_delay = pdata->chip.chip_delay;
data->chip.options |= pdata->chip.options;
data->chip.bbt_options |= pdata->chip.bbt_options;
data->chip.ecc.mode = NAND_ECC_SOFT;
data->chip.ecc.algo = NAND_ECC_HAMMING;
platform_set_drvdata(pdev, data);
/* Handle any platform specific setup */
if (pdata->ctrl.probe) {
err = pdata->ctrl.probe(pdev);
if (err)
goto out;
}
/* 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_release(&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);
nand_release(&data->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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