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
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/platform_device.h>
18#include <linux/mtd/mtd.h>
19#include <linux/mtd/onenand.h>
20#include <linux/mtd/partitions.h>
21#include <linux/io.h>
22
23/*
24 * Note: Driver name and platform data format have been updated!
25 *
26 * This version of the driver is named "onenand-flash" and takes struct
27 * onenand_platform_data as platform data. The old ARM-specific version
28 * with the name "onenand" used to take struct flash_platform_data.
29 */
30#define DRIVER_NAME	"onenand-flash"
31
32struct onenand_info {
33	struct mtd_info		mtd;
34	struct onenand_chip	onenand;
35};
36
37static int generic_onenand_probe(struct platform_device *pdev)
38{
39	struct onenand_info *info;
40	struct onenand_platform_data *pdata = dev_get_platdata(&pdev->dev);
41	struct resource *res = pdev->resource;
42	unsigned long size = resource_size(res);
43	int err;
44
45	info = kzalloc(sizeof(struct onenand_info), GFP_KERNEL);
46	if (!info)
47		return -ENOMEM;
48
49	if (!request_mem_region(res->start, size, dev_name(&pdev->dev))) {
50		err = -EBUSY;
51		goto out_free_info;
52	}
53
54	info->onenand.base = ioremap(res->start, size);
55	if (!info->onenand.base) {
56		err = -ENOMEM;
57		goto out_release_mem_region;
58	}
59
60	info->onenand.mmcontrol = pdata ? pdata->mmcontrol : NULL;
61	info->onenand.irq = platform_get_irq(pdev, 0);
62
63	info->mtd.dev.parent = &pdev->dev;
64	info->mtd.priv = &info->onenand;
65
66	if (onenand_scan(&info->mtd, 1)) {
67		err = -ENXIO;
68		goto out_iounmap;
69	}
70
71	err = mtd_device_parse_register(&info->mtd, NULL, NULL,
72					pdata ? pdata->parts : NULL,
73					pdata ? pdata->nr_parts : 0);
74
75	platform_set_drvdata(pdev, info);
76
77	return 0;
78
79out_iounmap:
80	iounmap(info->onenand.base);
81out_release_mem_region:
82	release_mem_region(res->start, size);
83out_free_info:
84	kfree(info);
85
86	return err;
87}
88
89static int generic_onenand_remove(struct platform_device *pdev)
90{
91	struct onenand_info *info = platform_get_drvdata(pdev);
92	struct resource *res = pdev->resource;
93	unsigned long size = resource_size(res);
94
95	if (info) {
96		onenand_release(&info->mtd);
97		release_mem_region(res->start, size);
98		iounmap(info->onenand.base);
99		kfree(info);
100	}
101
102	return 0;
103}
104
105static struct platform_driver generic_onenand_driver = {
106	.driver = {
107		.name		= DRIVER_NAME,
108	},
109	.probe		= generic_onenand_probe,
110	.remove		= generic_onenand_remove,
111};
112
113module_platform_driver(generic_onenand_driver);
114
115MODULE_LICENSE("GPL");
116MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
117MODULE_DESCRIPTION("Glue layer for OneNAND flash on generic boards");
118MODULE_ALIAS("platform:" DRIVER_NAME);
119