[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>
#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 platform_device *pdev)
{
	struct onenand_info *info;
	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, pdev->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 = 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->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 = res->end - res->start + 1;

	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>
	22
	23	#include <asm/io.h>
	24	#include <asm/mach/flash.h>
	25
	26	#define DRIVER_NAME "onenand"
	27
	28
	29	#ifdef CONFIG_MTD_PARTITIONS
	30	static const char *part_probes[] = { "cmdlinepart", NULL, };
	31	#endif
	32
	33	struct onenand_info {
	34	struct mtd_info mtd;
	35	struct mtd_partition *parts;
	36	struct onenand_chip onenand;
	37	};
	38
7a192ec3	39	static int __devinit generic_onenand_probe(struct platform_device *pdev)
68ee4b1c KP	40	{
68ee4b1c KP	41	struct onenand_info *info;
27f4e083	42	struct flash_platform_data *pdata = pdev->dev.platform_data;
68ee4b1c KP	43	struct resource *res = pdev->resource;
	44	unsigned long size = res->end - res->start + 1;
	45	int err;
	46
95b93a0c	47	info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
68ee4b1c KP	48	if (!info)
	49	return -ENOMEM;
	50
7a192ec3	51	if (!request_mem_region(res->start, size, pdev->dev.driver->name)) {
68ee4b1c KP	52	err = -EBUSY;
	53	goto out_free_info;
	54	}
	55
	56	info->onenand.base = ioremap(res->start, size);
	57	if (!info->onenand.base) {
	58	err = -ENOMEM;
	59	goto out_release_mem_region;
	60	}
	61
	62	info->onenand.mmcontrol = pdata->mmcontrol;
2c22120f	63	info->onenand.irq = platform_get_irq(pdev, 0);
68ee4b1c	64
475b44c1	65	info->mtd.name = dev_name(&pdev->dev);
68ee4b1c KP	66	info->mtd.priv = &info->onenand;
	67	info->mtd.owner = THIS_MODULE;
	68
	69	if (onenand_scan(&info->mtd, 1)) {
	70	err = -ENXIO;
	71	goto out_iounmap;
	72	}
	73
	74	#ifdef CONFIG_MTD_PARTITIONS
	75	err = parse_mtd_partitions(&info->mtd, part_probes, &info->parts, 0);
	76	if (err > 0)
	77	add_mtd_partitions(&info->mtd, info->parts, err);
ba753211	78	else if (err <= 0 && pdata->parts)
68ee4b1c KP	79	add_mtd_partitions(&info->mtd, pdata->parts, pdata->nr_parts);
	80	else
	81	#endif
	82	err = add_mtd_device(&info->mtd);
	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 KP	101	struct resource *res = pdev->resource;
	102	unsigned long size = res->end - res->start + 1;
	103
7a192ec3	104	platform_set_drvdata(pdev, NULL);
68ee4b1c KP	105
	106	if (info) {
	107	if (info->parts)
	108	del_mtd_partitions(&info->mtd);
	109	else
	110	del_mtd_device(&info->mtd);
	111
	112	onenand_release(&info->mtd);
	113	release_mem_region(res->start, size);
	114	iounmap(info->onenand.base);
	115	kfree(info);
	116	}
	117
	118	return 0;
	119	}
	120
7a192ec3 ML	121	static struct platform_driver generic_onenand_driver = {
	122	.driver = {
	123	.name = DRIVER_NAME,
	124	.owner = THIS_MODULE,
	125	},
68ee4b1c KP	126	.probe = generic_onenand_probe,
	127	.remove = __devexit_p(generic_onenand_remove),
	128	};
	129
	130	MODULE_ALIAS(DRIVER_NAME);
	131
	132	static int __init generic_onenand_init(void)
	133	{
7a192ec3	134	return platform_driver_register(&generic_onenand_driver);
68ee4b1c KP	135	}
	136
	137	static void __exit generic_onenand_exit(void)
	138	{
7a192ec3	139	platform_driver_unregister(&generic_onenand_driver);
68ee4b1c KP	140	}
	141
	142	module_init(generic_onenand_init);
	143	module_exit(generic_onenand_exit);
	144
	145	MODULE_LICENSE("GPL");
	146	MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
	147	MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");