blob: 6dd7f687c96268bb9fd02ae3e11e479afaab8592 (
plain)
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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*/
#include <common.h>
#include <driver.h>
#include <init.h>
static struct cdev_operations memops = {
.read = mem_read,
.write = mem_write,
.memmap = generic_memmap_rw,
};
static int mem_probe(struct device_d *dev)
{
struct cdev *cdev;
cdev = xzalloc(sizeof (*cdev));
dev->priv = cdev;
cdev->name = (char*)dev->resource[0].name;
if (dev->resource[0].start == 0 && dev->resource[0].end == ~0) {
/*
* Special case for /dev/mem. We can't express it's size as it's
* outside of our address range. Set DEVFS_IS_CHARACTER_DEV to
* bypass size checks.
*/
cdev->size = 0;
cdev->flags = DEVFS_IS_CHARACTER_DEV;
} else {
cdev->size = resource_size(&dev->resource[0]);
}
cdev->ops = &memops;
cdev->dev = dev;
devfs_create(cdev);
return 0;
}
static struct driver_d mem_drv = {
.name = "mem",
.probe = mem_probe,
};
static int mem_init(void)
{
struct device_d *dev;
struct resource res = {
.start = 0,
.end = ~0,
.flags = IORESOURCE_MEM,
.name = "mem",
};
int ret;
dev = device_alloc("mem", DEVICE_ID_DYNAMIC);
if (!dev)
return -ENOMEM;
dev->resource = xmemdup(&res, sizeof(res));
dev->num_resources = 1;
ret = platform_device_register(dev);
if (ret)
return ret;
return platform_driver_register(&mem_drv);
}
device_initcall(mem_init);
|