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
|
/*
* NV-RAM memory access on autcpu12
* (C) 2002 Thomas Gleixner (gleixner@autronix.de)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/sizes.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/map.h>
struct autcpu12_nvram_priv {
struct mtd_info *mtd;
struct map_info map;
};
static int __devinit autcpu12_nvram_probe(struct platform_device *pdev)
{
map_word tmp, save0, save1;
struct resource *res;
struct autcpu12_nvram_priv *priv;
priv = devm_kzalloc(&pdev->dev,
sizeof(struct autcpu12_nvram_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get memory resource\n");
return -ENOENT;
}
priv->map.bankwidth = 4;
priv->map.phys = res->start;
priv->map.size = resource_size(res);
priv->map.virt = devm_request_and_ioremap(&pdev->dev, res);
strcpy((char *)priv->map.name, res->name);
if (!priv->map.virt) {
dev_err(&pdev->dev, "failed to remap mem resource\n");
return -EBUSY;
}
simple_map_init(&priv->map);
/*
* Check for 32K/128K
* read ofs 0
* read ofs 0x10000
* Write complement to ofs 0x100000
* Read and check result on ofs 0x0
* Restore contents
*/
save0 = map_read(&priv->map, 0);
save1 = map_read(&priv->map, 0x10000);
tmp.x[0] = ~save0.x[0];
map_write(&priv->map, tmp, 0x10000);
tmp = map_read(&priv->map, 0);
/* if we find this pattern on 0x0, we have 32K size */
if (!map_word_equal(&priv->map, tmp, save0)) {
map_write(&priv->map, save0, 0x0);
priv->map.size = SZ_32K;
} else
map_write(&priv->map, save1, 0x10000);
priv->mtd = do_map_probe("map_ram", &priv->map);
if (!priv->mtd) {
dev_err(&pdev->dev, "probing failed\n");
return -ENXIO;
}
priv->mtd->owner = THIS_MODULE;
priv->mtd->erasesize = 16;
priv->mtd->dev.parent = &pdev->dev;
if (!mtd_device_register(priv->mtd, NULL, 0)) {
dev_info(&pdev->dev,
"NV-RAM device size %ldKiB registered on AUTCPU12\n",
priv->map.size / SZ_1K);
return 0;
}
map_destroy(priv->mtd);
dev_err(&pdev->dev, "NV-RAM device addition failed\n");
return -ENOMEM;
}
static int __devexit autcpu12_nvram_remove(struct platform_device *pdev)
{
struct autcpu12_nvram_priv *priv = platform_get_drvdata(pdev);
mtd_device_unregister(priv->mtd);
map_destroy(priv->mtd);
return 0;
}
static struct platform_driver autcpu12_nvram_driver = {
.driver = {
.name = "autcpu12_nvram",
.owner = THIS_MODULE,
},
.probe = autcpu12_nvram_probe,
.remove = autcpu12_nvram_remove,
};
module_platform_driver(autcpu12_nvram_driver);
MODULE_AUTHOR("Thomas Gleixner");
MODULE_DESCRIPTION("autcpu12 NVRAM map driver");
MODULE_LICENSE("GPL");
|
