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/*

 *  linux/drivers/mtd/onenand/generic.c

 *

 *  Copyright (c) 2005 Samsung Electronics

 *  Kyungmin Park <kyungmin.park@samsung.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.

 *

 *  Overview:

 *   This is a device driver for the OneNAND flash for generic boards.

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/platform_device.h>

#include <linux/mtd/mtd.h>

#include <linux/mtd/onenand.h>

#include <linux/mtd/partitions.h>

#include <asm/io.h>

#include <asm/mach/flash.h>

#define DRIVER_NAME     "onenand"

#ifdef CONFIG_MTD_PARTITIONS

static const char *part_probes[] = { "cmdlinepart", NULL,  };

#endif

struct onenand_info {

        struct mtd_info         mtd;

        struct mtd_partition    *parts;

        struct onenand_chip     onenand;

};

static int __devinit generic_onenand_probe(struct device *dev)

{

        struct onenand_info *info;

        struct platform_device *pdev = to_platform_device(dev);

        struct flash_platform_data *pdata = pdev->dev.platform_data;

        struct resource *res = pdev->resource;

        unsigned long size = res->end - res->start + 1;

        int err;

        info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);

        if (!info)

                return -ENOMEM;

        if (!request_mem_region(res->start, size, dev->driver->name)) {

                err = -EBUSY;

                goto out_free_info;

        }

        info->onenand.base = ioremap(res->start, size);

        if (!info->onenand.base) {

                err = -ENOMEM;

                goto out_release_mem_region;

        }

        info->onenand.mmcontrol = pdata->mmcontrol;

        info->onenand.irq = platform_get_irq(pdev, 0);

        info->mtd.name = pdev->dev.bus_id;

        info->mtd.priv = &info->onenand;

        info->mtd.owner = THIS_MODULE;

        if (onenand_scan(&info->mtd, 1)) {

                err = -ENXIO;

                goto out_iounmap;

        }

#ifdef CONFIG_MTD_PARTITIONS

        err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);

        if (err > 0)

                add_mtd_partitions(&info->mtd, info->parts, err);

        else if (err < 0 && pdata->parts)

                add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);

        else

#endif

                err = add_mtd_device(&info->mtd);

        dev_set_drvdata(&pdev->dev, info);

        return 0;

out_iounmap:

        iounmap(info->onenand.base);

out_release_mem_region:

        release_mem_region(res->start, size);

out_free_info:

        kfree(info);

        return err;

}

static int __devexit generic_onenand_remove(struct device *dev)

{

        struct platform_device *pdev = to_platform_device(dev);

        struct onenand_info *info = dev_get_drvdata(&pdev->dev);

        struct resource *res = pdev->resource;

        unsigned long size = res->end - res->start + 1;

        dev_set_drvdata(&pdev->dev, NULL);

        if (info) {

                if (info->parts)

                        del_mtd_partitions(&info->mtd);

                else

                        del_mtd_device(&info->mtd);

                onenand_release(&info->mtd);

                release_mem_region(res->start, size);

                iounmap(info->onenand.base);

                kfree(info);

        }

        return 0;

}

static struct device_driver generic_onenand_driver = {

        .name           = DRIVER_NAME,

        .bus            = &platform_bus_type,

        .probe          = generic_onenand_probe,

        .remove         = __devexit_p(generic_onenand_remove),

};

MODULE_ALIAS(DRIVER_NAME);

static int __init generic_onenand_init(void)

{

        return driver_register(&generic_onenand_driver);

}

static void __exit generic_onenand_exit(void)

{

        driver_unregister(&generic_onenand_driver);

}

module_init(generic_onenand_init);

module_exit(generic_onenand_exit);

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");

MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");