[linux-block.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"

#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 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;
	}

#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 && pdata->parts)
		add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
	else
#endif
		err = add_mtd_device(&info->mtd);

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

MODULE_ALIAS(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 KP	32
	33	#ifdef CONFIG_MTD_PARTITIONS
	34	static const char *part_probes[] = { "cmdlinepart", NULL, };
	35	#endif
	36
	37	struct onenand_info {
	38	struct mtd_info mtd;
	39	struct mtd_partition *parts;
	40	struct onenand_chip onenand;
	41	};
	42
7a192ec3	43	static int __devinit generic_onenand_probe(struct platform_device *pdev)
68ee4b1c KP	44	{
68ee4b1c KP	45	struct onenand_info *info;
778dbcc1	46	struct onenand_platform_data *pdata = pdev->dev.platform_data;
68ee4b1c	47	struct resource *res = pdev->resource;
778dbcc1	48	unsigned long size = resource_size(res);
68ee4b1c KP	49	int err;
68ee4b1c KP	50
95b93a0c	51	info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
68ee4b1c KP	52	if (!info)
	53	return -ENOMEM;
	54
778dbcc1	55	if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
68ee4b1c KP	56	err = -EBUSY;
	57	goto out_free_info;
	58	}
	59
	60	info->onenand.base = ioremap(res->start, size);
	61	if (!info->onenand.base) {
	62	err = -ENOMEM;
	63	goto out_release_mem_region;
	64	}
	65
778dbcc1	66	info->onenand.mmcontrol = pdata ? pdata->mmcontrol : 0;
2c22120f	67	info->onenand.irq = platform_get_irq(pdev, 0);
68ee4b1c	68
475b44c1	69	info->mtd.name = dev_name(&pdev->dev);
68ee4b1c KP	70	info->mtd.priv = &info->onenand;
	71	info->mtd.owner = THIS_MODULE;
	72
	73	if (onenand_scan(&info->mtd, 1)) {
	74	err = -ENXIO;
	75	goto out_iounmap;
	76	}
	77
	78	#ifdef CONFIG_MTD_PARTITIONS
	79	err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
	80	if (err > 0)
	81	add_mtd_partitions(&info->mtd, info->parts, err);
778dbcc1	82	else if (err <= 0 && pdata && pdata->parts)
68ee4b1c KP	83	add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
	84	else
	85	#endif
	86	err = add_mtd_device(&info->mtd);
	87
7a192ec3	88	platform_set_drvdata(pdev, info);
68ee4b1c KP	89
	90	return 0;
	91
	92	out_iounmap:
	93	iounmap(info->onenand.base);
	94	out_release_mem_region:
	95	release_mem_region(res->start, size);
	96	out_free_info:
	97	kfree(info);
	98
	99	return err;
	100	}
	101
7a192ec3	102	static int __devexit generic_onenand_remove(struct platform_device *pdev)
68ee4b1c	103	{
7a192ec3	104	struct onenand_info *info = platform_get_drvdata(pdev);
68ee4b1c	105	struct resource *res = pdev->resource;
778dbcc1	106	unsigned long size = resource_size(res);
68ee4b1c	107
7a192ec3	108	platform_set_drvdata(pdev, NULL);
68ee4b1c KP	109
	110	if (info) {
	111	if (info->parts)
	112	del_mtd_partitions(&info->mtd);
	113	else
	114	del_mtd_device(&info->mtd);
	115
	116	onenand_release(&info->mtd);
	117	release_mem_region(res->start, size);
	118	iounmap(info->onenand.base);
	119	kfree(info);
	120	}
	121
	122	return 0;
	123	}
	124
7a192ec3 ML	125	static struct platform_driver generic_onenand_driver = {
	126	.driver = {
	127	.name = DRIVER_NAME,
	128	.owner = THIS_MODULE,
	129	},
68ee4b1c KP	130	.probe = generic_onenand_probe,
	131	.remove = __devexit_p(generic_onenand_remove),
	132	};
	133
	134	MODULE_ALIAS(DRIVER_NAME);
	135
	136	static int __init generic_onenand_init(void)
	137	{
7a192ec3	138	return platform_driver_register(&generic_onenand_driver);
68ee4b1c KP	139	}
	140
	141	static void __exit generic_onenand_exit(void)
	142	{
7a192ec3	143	platform_driver_unregister(&generic_onenand_driver);
68ee4b1c KP	144	}
	145
	146	module_init(generic_onenand_init);
	147	module_exit(generic_onenand_exit);
	148
	149	MODULE_LICENSE("GPL");
	150	MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
	151	MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");