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
|
/*
* 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 __init plat_nand_probe(struct platform_device *pdev)
{
struct platform_nand_data *pdata = pdev->dev.platform_data;
struct plat_nand_data *data;
int res = 0;
/* 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;
}
data->io_base = ioremap(pdev->resource[0].start,
pdev->resource[0].end - pdev->resource[0].start + 1);
if (data->io_base == NULL) {
dev_err(&pdev->dev, "ioremap failed\n");
kfree(data);
return -EIO;
}
data->chip.priv = &data;
data->mtd.priv = &data->chip;
data->mtd.owner = THIS_MODULE;
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.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);
/* Scan to find existance of the device */
if (nand_scan(&data->mtd, 1)) {
res = -ENXIO;
goto out;
}
#ifdef CONFIG_MTD_PARTITIONS
if (pdata->chip.part_probe_types) {
res = parse_mtd_partitions(&data->mtd,
pdata->chip.part_probe_types,
&data->parts, 0);
if (res > 0) {
add_mtd_partitions(&data->mtd, data->parts, res);
return 0;
}
}
if (pdata->chip.partitions) {
data->parts = pdata->chip.partitions;
res = add_mtd_partitions(&data->mtd, data->parts,
pdata->chip.nr_partitions);
} else
#endif
res = add_mtd_device(&data->mtd);
if (!res)
return res;
nand_release(&data->mtd);
out:
platform_set_drvdata(pdev, NULL);
iounmap(data->io_base);
kfree(data);
return res;
}
/*
* Remove a NAND device.
*/
static int __devexit plat_nand_remove(struct platform_device *pdev)
{
struct plat_nand_data *data = platform_get_drvdata(pdev);
#ifdef CONFIG_MTD_PARTITIONS
struct platform_nand_data *pdata = pdev->dev.platform_data;
#endif
nand_release(&data->mtd);
#ifdef CONFIG_MTD_PARTITIONS
if (data->parts && data->parts != pdata->chip.partitions)
kfree(data->parts);
#endif
iounmap(data->io_base);
kfree(data);
return 0;
}
static struct platform_driver plat_nand_driver = {
.probe = plat_nand_probe,
.remove = 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");
|
