[deliverable/linux.git] / drivers / mtd / onenand / generic.c

/*
 *  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>

/*
 * 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"

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

struct onenand_info {
	struct mtd_info		mtd;
	struct mtd_partition	*parts;
	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 = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
	if (err > 0)
		mtd_device_register(&info->mtd, info->parts, err);
	else if (err <= 0 && pdata && pdata->parts)
		mtd_device_register(&info->mtd, pdata->parts, pdata->nr_parts);
	else
		err = mtd_device_register(&info->mtd, NULL, 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) {
		mtd_device_unregister(&info->mtd);
		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_ALIAS("platform:" DRIVER_NAME);

static int __init generic_onenand_init(void)
{
	return platform_driver_register(&generic_onenand_driver);
}

static void __exit generic_onenand_exit(void)
{
	platform_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");
Commit	Line	Data
68ee4b1c KP	1	/*
	2	* linux/drivers/mtd/onenand/generic.c
	3	*
	4	* Copyright (c) 2005 Samsung Electronics
	5	* Kyungmin Park <kyungmin.park@samsung.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* Overview:
	12	* This is a device driver for the OneNAND flash for generic boards.
	13	*/
	14
68ee4b1c KP	15	#include <linux/module.h>
68ee4b1c KP	16	#include <linux/init.h>
de25968c	17	#include <linux/slab.h>
27f4e083	18	#include <linux/platform_device.h>
68ee4b1c KP	19	#include <linux/mtd/mtd.h>
	20	#include <linux/mtd/onenand.h>
	21	#include <linux/mtd/partitions.h>
68ee4b1c	22	#include <asm/io.h>
68ee4b1c	23
778dbcc1 MD	24	/*
	25	* Note: Driver name and platform data format have been updated!
	26	*
	27	* This version of the driver is named "onenand-flash" and takes struct
	28	* onenand_platform_data as platform data. The old ARM-specific version
	29	* with the name "onenand" used to take struct flash_platform_data.
	30	*/
	31	#define DRIVER_NAME "onenand-flash"
68ee4b1c	32
68ee4b1c	33	static const char *part_probes[] = { "cmdlinepart", NULL, };
68ee4b1c KP	34
	35	struct onenand_info {
	36	struct mtd_info mtd;
	37	struct mtd_partition *parts;
	38	struct onenand_chip onenand;
	39	};
	40
7a192ec3	41	static int __devinit generic_onenand_probe(struct platform_device *pdev)
68ee4b1c KP	42	{
68ee4b1c KP	43	struct onenand_info *info;
778dbcc1	44	struct onenand_platform_data *pdata = pdev->dev.platform_data;
68ee4b1c	45	struct resource *res = pdev->resource;
778dbcc1	46	unsigned long size = resource_size(res);
68ee4b1c KP	47	int err;
68ee4b1c KP	48
95b93a0c	49	info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
68ee4b1c KP	50	if (!info)
	51	return -ENOMEM;
	52
778dbcc1	53	if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
68ee4b1c KP	54	err = -EBUSY;
	55	goto out_free_info;
	56	}
	57
	58	info->onenand.base = ioremap(res->start, size);
	59	if (!info->onenand.base) {
	60	err = -ENOMEM;
	61	goto out_release_mem_region;
	62	}
	63
778dbcc1	64	info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0;
2c22120f	65	info->onenand.irq = platform_get_irq(pdev, 0);
68ee4b1c	66
475b44c1	67	info->mtd.name = dev_name(&pdev->dev);
68ee4b1c KP	68	info->mtd.priv = &info->onenand;
	69	info->mtd.owner = THIS_MODULE;
	70
	71	if (onenand_scan(&info->mtd, 1)) {
	72	err = -ENXIO;
	73	goto out_iounmap;
	74	}
	75
68ee4b1c KP	76	err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
68ee4b1c KP	77	if (err > 0)
711a632d	78	mtd_device_register(&info->mtd, info->parts, err);
778dbcc1	79	else if (err <= 0 && pdata && pdata->parts)
711a632d	80	mtd_device_register(&info->mtd, pdata->parts, pdata->nr_parts);
68ee4b1c	81	else
711a632d	82	err = mtd_device_register(&info->mtd, NULL, 0);
68ee4b1c	83
7a192ec3	84	platform_set_drvdata(pdev, info);
68ee4b1c KP	85
	86	return 0;
	87
	88	out_iounmap:
	89	iounmap(info->onenand.base);
	90	out_release_mem_region:
	91	release_mem_region(res->start, size);
	92	out_free_info:
	93	kfree(info);
	94
	95	return err;
	96	}
	97
7a192ec3	98	static int __devexit generic_onenand_remove(struct platform_device *pdev)
68ee4b1c	99	{
7a192ec3	100	struct onenand_info *info = platform_get_drvdata(pdev);
68ee4b1c	101	struct resource *res = pdev->resource;
778dbcc1	102	unsigned long size = resource_size(res);
68ee4b1c	103
7a192ec3	104	platform_set_drvdata(pdev, NULL);
68ee4b1c KP	105
68ee4b1c KP	106	if (info) {
711a632d	107	mtd_device_unregister(&info->mtd);
68ee4b1c KP	108	onenand_release(&info->mtd);
	109	release_mem_region(res->start, size);
	110	iounmap(info->onenand.base);
	111	kfree(info);
	112	}
	113
	114	return 0;
	115	}
	116
7a192ec3 ML	117	static struct platform_driver generic_onenand_driver = {
	118	.driver = {
	119	.name = DRIVER_NAME,
	120	.owner = THIS_MODULE,
	121	},
68ee4b1c KP	122	.probe = generic_onenand_probe,
	123	.remove = __devexit_p(generic_onenand_remove),
	124	};
	125
c804c733	126	MODULE_ALIAS("platform:" DRIVER_NAME);
68ee4b1c KP	127
	128	static int __init generic_onenand_init(void)
	129	{
7a192ec3	130	return platform_driver_register(&generic_onenand_driver);
68ee4b1c KP	131	}
	132
	133	static void __exit generic_onenand_exit(void)
	134	{
7a192ec3	135	platform_driver_unregister(&generic_onenand_driver);
68ee4b1c KP	136	}
	137
	138	module_init(generic_onenand_init);
	139	module_exit(generic_onenand_exit);
	140
	141	MODULE_LICENSE("GPL");
	142	MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
	143	MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");