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
|
/*
* 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");
|
