generic.c

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/*
 *  linux/drivers/mtd/onenand/generic.c
 *
 *  Copyright (c) 2005 Samsung Electronics
 *  Kyungmin Park <[email protected]>
 *
 * 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>

/*
 * Note: Driver name and platform data format have been updated!
 *
 * This version of the driver is named "onenand-flash" and takes struct
 * onenand_platform_data as platform data. The old ARM-specific version
 * with the name "onenand" used to take struct flash_platform_data.
 */
#define DRIVER_NAME "onenand-flash"

struct onenand_info {
    struct mtd_info     mtd;
    struct onenand_chip onenand;
};

static int __devinit generic_onenand_probe(struct platform_device *pdev)
{
    struct onenand_info *info;
    struct onenand_platform_data *pdata = pdev->dev.platform_data;
    struct resource *res = pdev->resource;
    unsigned long size = resource_size(res);
    int err;

    info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
    if (!info)
        return -ENOMEM;

    if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
        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 ? pdata->mmcontrol : 0;
    info->onenand.irq = platform_get_irq(pdev, 0);

    info->mtd.name = dev_name(&pdev->dev);
    info->mtd.priv = &info->onenand;
    info->mtd.owner = THIS_MODULE;

    if (onenand_scan(&info->mtd, 1)) {
        err = -ENXIO;
        goto out_iounmap;
    }

    err = mtd_device_parse_register(&info->mtd, NULL, NULL,
                    pdata ? pdata->parts : NULL,
                    pdata ? pdata->nr_parts : 0);

    platform_set_drvdata(pdev, 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 platform_device *pdev)
{
    struct onenand_info *info = platform_get_drvdata(pdev);
    struct resource *res = pdev->resource;
    unsigned long size = resource_size(res);

    platform_set_drvdata(pdev, NULL);

    if (info) {
        onenand_release(&info->mtd);
        release_mem_region(res->start, size);
        iounmap(info->onenand.base);
        kfree(info);
    }

    return 0;
}

static struct platform_driver generic_onenand_driver = {
    .driver = {
        .name       = DRIVER_NAME,
        .owner      = THIS_MODULE,
    },
    .probe      = generic_onenand_probe,
    .remove     = __devexit_p(generic_onenand_remove),
};

module_platform_driver(generic_onenand_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kyungmin Park <[email protected]>");
MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
MODULE_ALIAS("platform:" DRIVER_NAME);