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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/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
struct plat_nand_data {
struct nand_chip chip;
struct mtd_info mtd;
void __iomem *io_base;
int nr_parts;
struct mtd_partition *parts;
};
/*
* Probe for the NAND device.
*/
static int __devinit plat_nand_probe(struct platform_device *pdev)
{
struct platform_nand_data *pdata = pdev->dev.platform_data;
struct plat_nand_data *data;
struct resource *res;
int err = 0;
if (pdata->chip.nr_chips < 1) {
dev_err(&pdev->dev, "invalid number of chips specified\n");
return -EINVAL;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENXIO;
/* Allocate memory for the device structure (and zero it) */
data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
if (!data) {
dev_err(&pdev->dev, "failed to allocate device structure.\n");
return -ENOMEM;
}
if (!request_mem_region(res->start, resource_size(res),
dev_name(&pdev->dev))) {
dev_err(&pdev->dev, "request_mem_region failed\n");
err = -EBUSY;
goto out_free;
}
data->io_base = ioremap(res->start, resource_size(res));
if (data->io_base == NULL) {
dev_err(&pdev->dev, "ioremap failed\n");
err = -EIO;
goto out_release_io;
}
data->chip.priv = &data;
data->mtd.priv = &data->chip;
data->mtd.owner = THIS_MODULE;
data->mtd.name = dev_name(&pdev->dev);
data->chip.IO_ADDR_R = data->io_base;
data->chip.IO_ADDR_W = data->io_base;
data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
data->chip.dev_ready = pdata->ctrl.dev_ready;
data->chip.select_chip = pdata->ctrl.select_chip;
data->chip.write_buf = pdata->ctrl.write_buf;
data->chip.read_buf = pdata->ctrl.read_buf;
data->chip.chip_delay = pdata->chip.chip_delay;
data->chip.options |= pdata->chip.options;
data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
data->chip.ecc.layout = pdata->chip.ecclayout;
data->chip.ecc.mode = NAND_ECC_SOFT;
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 */
if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
err = -ENXIO;
goto out;
}
if (pdata->chip.part_probe_types) {
err = parse_mtd_partitions(&data->mtd,
pdata->chip.part_probe_types,
&data->parts, 0);
if (err > 0) {
mtd_device_register(&data->mtd, data->parts, err);
return 0;
}
}
if (pdata->chip.set_parts)
pdata->chip.set_parts(data->mtd.size, &pdata->chip);
if (pdata->chip.partitions) {
data->parts = pdata->chip.partitions;
err = mtd_device_register(&data->mtd, data->parts,
pdata->chip.nr_partitions);
} else
err = mtd_device_register(&data->mtd, NULL, 0);
if (!err)
return err;
nand_release(&data->mtd);
out:
if (pdata->ctrl.remove)
pdata->ctrl.remove(pdev);
platform_set_drvdata(pdev, NULL);
iounmap(data->io_base);
out_release_io:
release_mem_region(res->start, resource_size(res));
out_free:
kfree(data);
return err;
}
/*
* Remove a NAND device.
*/
static int __devexit plat_nand_remove(struct platform_device *pdev)
{
struct plat_nand_data *data = platform_get_drvdata(pdev);
struct platform_nand_data *pdata = pdev->dev.platform_data;
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
nand_release(&data->mtd);
if (data->parts && data->parts != pdata->chip.partitions)
kfree(data->parts);
if (pdata->ctrl.remove)
pdata->ctrl.remove(pdev);
iounmap(data->io_base);
release_mem_region(res->start, resource_size(res));
kfree(data);
return 0;
}
static struct platform_driver plat_nand_driver = {
.probe = plat_nand_probe,
.remove = __devexit_p(plat_nand_remove),
.driver = {
.name = "gen_nand",
.owner = THIS_MODULE,
},
};
static int __init plat_nand_init(void)
{
return platform_driver_register(&plat_nand_driver);
}
static void __exit plat_nand_exit(void)
{
platform_driver_unregister(&plat_nand_driver);
}
module_init(plat_nand_init);
module_exit(plat_nand_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vitaly Wool");
MODULE_DESCRIPTION("Simple generic NAND driver");
MODULE_ALIAS("platform:gen_nand");
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