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
|
/*
* coreboot_table.c
*
* Module providing coreboot table access.
*
* Copyright 2017 Google Inc.
* Copyright 2017 Samuel Holland <samuel@sholland.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2.0 as published by
* the Free Software Foundation.
*
* 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.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "coreboot_table.h"
#define CB_DEV(d) container_of(d, struct coreboot_device, dev)
#define CB_DRV(d) container_of(d, struct coreboot_driver, drv)
static struct coreboot_table_header __iomem *ptr_header;
static int coreboot_bus_match(struct device *dev, struct device_driver *drv)
{
struct coreboot_device *device = CB_DEV(dev);
struct coreboot_driver *driver = CB_DRV(drv);
return device->entry.tag == driver->tag;
}
static int coreboot_bus_probe(struct device *dev)
{
int ret = -ENODEV;
struct coreboot_device *device = CB_DEV(dev);
struct coreboot_driver *driver = CB_DRV(dev->driver);
if (driver->probe)
ret = driver->probe(device);
return ret;
}
static int coreboot_bus_remove(struct device *dev)
{
int ret = 0;
struct coreboot_device *device = CB_DEV(dev);
struct coreboot_driver *driver = CB_DRV(dev->driver);
if (driver->remove)
ret = driver->remove(device);
return ret;
}
static struct bus_type coreboot_bus_type = {
.name = "coreboot",
.match = coreboot_bus_match,
.probe = coreboot_bus_probe,
.remove = coreboot_bus_remove,
};
static int __init coreboot_bus_init(void)
{
return bus_register(&coreboot_bus_type);
}
module_init(coreboot_bus_init);
static void coreboot_device_release(struct device *dev)
{
struct coreboot_device *device = CB_DEV(dev);
kfree(device);
}
int coreboot_driver_register(struct coreboot_driver *driver)
{
driver->drv.bus = &coreboot_bus_type;
return driver_register(&driver->drv);
}
EXPORT_SYMBOL(coreboot_driver_register);
void coreboot_driver_unregister(struct coreboot_driver *driver)
{
driver_unregister(&driver->drv);
}
EXPORT_SYMBOL(coreboot_driver_unregister);
int coreboot_table_init(struct device *dev, void __iomem *ptr)
{
int i, ret;
void *ptr_entry;
struct coreboot_device *device;
struct coreboot_table_entry entry;
struct coreboot_table_header header;
ptr_header = ptr;
memcpy_fromio(&header, ptr_header, sizeof(header));
if (strncmp(header.signature, "LBIO", sizeof(header.signature))) {
pr_warn("coreboot_table: coreboot table missing or corrupt!\n");
return -ENODEV;
}
ptr_entry = (void *)ptr_header + header.header_bytes;
for (i = 0; i < header.table_entries; i++) {
memcpy_fromio(&entry, ptr_entry, sizeof(entry));
device = kzalloc(sizeof(struct device) + entry.size, GFP_KERNEL);
if (!device) {
ret = -ENOMEM;
break;
}
dev_set_name(&device->dev, "coreboot%d", i);
device->dev.parent = dev;
device->dev.bus = &coreboot_bus_type;
device->dev.release = coreboot_device_release;
memcpy_fromio(&device->entry, ptr_entry, entry.size);
ret = device_register(&device->dev);
if (ret) {
put_device(&device->dev);
break;
}
ptr_entry += entry.size;
}
return ret;
}
EXPORT_SYMBOL(coreboot_table_init);
int coreboot_table_exit(void)
{
if (ptr_header) {
bus_unregister(&coreboot_bus_type);
iounmap(ptr_header);
ptr_header = NULL;
}
return 0;
}
EXPORT_SYMBOL(coreboot_table_exit);
MODULE_AUTHOR("Google, Inc.");
MODULE_LICENSE("GPL");
|
