aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/plat_nand.c
blob: 317aff428e428e1ce71e190ccece5de01cd49fec (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
/*
 * Generic NAND driver
 *
 * Author: Vitaly Wool <vitalywool@gmail.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.
 *
 */

#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>

struct plat_nand_data {
	struct nand_chip	chip;
	struct mtd_info		mtd;
	void __iomem		*io_base;
#ifdef CONFIG_MTD_PARTITIONS
	int			nr_parts;
	struct mtd_partition	*parts;
#endif
};

/*
 * Probe for the NAND device.
 */
static int __devinit plat_nand_probe(struct platform_device *pdev)
{
	struct platform_nand_data *pdata = pdev->dev.platform_data;
	struct plat_nand_data *data;
	struct resource *res;
	int err = 0;

	if (pdata->chip.nr_chips < 1) {
		dev_err(&pdev->dev, "invalid number of chips specified\n");
		return -EINVAL;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -ENXIO;

	/* Allocate memory for the device structure (and zero it) */
	data = kzalloc(sizeof(struct plat_nand_data), GFP_KERNEL);
	if (!data) {
		dev_err(&pdev->dev, "failed to allocate device structure.\n");
		return -ENOMEM;
	}

	if (!request_mem_region(res->start, resource_size(res),
				dev_name(&pdev->dev))) {
		dev_err(&pdev->dev, "request_mem_region failed\n");
		err = -EBUSY;
		goto out_free;
	}

	data->io_base = ioremap(res->start, resource_size(res));
	if (data->io_base == NULL) {
		dev_err(&pdev->dev, "ioremap failed\n");
		err = -EIO;
		goto out_release_io;
	}

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

	data->chip.IO_ADDR_R = data->io_base;
	data->chip.IO_ADDR_W = data->io_base;
	data->chip.cmd_ctrl = pdata->ctrl.cmd_ctrl;
	data->chip.dev_ready = pdata->ctrl.dev_ready;
	data->chip.select_chip = pdata->ctrl.select_chip;
	data->chip.write_buf = pdata->ctrl.write_buf;
	data->chip.read_buf = pdata->ctrl.read_buf;
	data->chip.chip_delay = pdata->chip.chip_delay;
	data->chip.options |= pdata->chip.options;

	data->chip.ecc.hwctl = pdata->ctrl.hwcontrol;
	data->chip.ecc.layout = pdata->chip.ecclayout;
	data->chip.ecc.mode = NAND_ECC_SOFT;

	platform_set_drvdata(pdev, data);

	/* Handle any platform specific setup */
	if (pdata->ctrl.probe) {
		err = pdata->ctrl.probe(pdev);
		if (err)
			goto out;
	}

	/* Scan to find existance of the device */
	if (nand_scan(&data->mtd, pdata->chip.nr_chips)) {
		err = -ENXIO;
		goto out;
	}

#ifdef CONFIG_MTD_PARTITIONS
	if (pdata->chip.part_probe_types) {
		err = parse_mtd_partitions(&data->mtd,
					pdata->chip.part_probe_types,
					&data->parts, 0);
		if (err > 0) {
			add_mtd_partitions(&data->mtd, data->parts, err);
			return 0;
		}
	}
	if (pdata->chip.set_parts)
		pdata->chip.set_parts(data->mtd.size, &pdata->chip);
	if (pdata->chip.partitions) {
		data->parts = pdata->chip.partitions;
		err = add_mtd_partitions(&data->mtd, data->parts,
			pdata->chip.nr_partitions);
	} else
#endif
	err = add_mtd_device(&data->mtd);

	if (!err)
		return err;

	nand_release(&data->mtd);
out:
	if (pdata->ctrl.remove)
		pdata->ctrl.remove(pdev);
	platform_set_drvdata(pdev, NULL);
	iounmap(data->io_base);
out_release_io:
	release_mem_region(res->start, resource_size(res));
out_free:
	kfree(data);
	return err;
}

/*
 * Remove a NAND device.
 */
static int __devexit plat_nand_remove(struct platform_device *pdev)
{
	struct plat_nand_data *data = platform_get_drvdata(pdev);
	struct platform_nand_data *pdata = pdev->dev.platform_data;
	struct resource *res;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	nand_release(&data->mtd);
#ifdef CONFIG_MTD_PARTITIONS
	if (data->parts && data->parts != pdata->chip.partitions)
		kfree(data->parts);
#endif
	if (pdata->ctrl.remove)
		pdata->ctrl.remove(pdev);
	iounmap(data->io_base);
	release_mem_region(res->start, resource_size(res));
	kfree(data);

	return 0;
}

static struct platform_driver plat_nand_driver = {
	.probe		= plat_nand_probe,
	.remove		= __devexit_p(plat_nand_remove),
	.driver		= {
		.name	= "gen_nand",
		.owner	= THIS_MODULE,
	},
};

static int __init plat_nand_init(void)
{
	return platform_driver_register(&plat_nand_driver);
}

static void __exit plat_nand_exit(void)
{
	platform_driver_unregister(&plat_nand_driver);
}

module_init(plat_nand_init);
module_exit(plat_nand_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Vitaly Wool");
MODULE_DESCRIPTION("Simple generic NAND driver");
MODULE_ALIAS("platform:gen_nand");