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
|
/* SPDX-License-Identifier: GPL-2.0-only */
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <reset.h>
const char mainboard_name[] = CONFIG_MAINBOARD_VENDOR " " CONFIG_MAINBOARD_PART_NUMBER;
void enable_static_device(struct device *dev)
{
if (dev->chip_ops && dev->chip_ops->enable_dev)
dev->chip_ops->enable_dev(dev);
if (dev->ops && dev->ops->enable)
dev->ops->enable(dev);
printk(BIOS_DEBUG, "%s %s\n", dev_path(dev),
dev->enabled ? "enabled" : "disabled");
}
/**
* Enable devices on static buses.
*
* The enumeration of certain buses is purely static. The existence of
* devices on those buses can be completely determined at compile time
* and is specified in the config file. Typical examples are the 'PNP'
* devices on a legacy ISA/LPC bus. There is no need of probing of any kind,
* the only thing we have to do is to walk through the bus and
* enable or disable devices as indicated in the config file.
*
* On the other hand, some devices are virtual and their existence is
* artificial. They can not be probed at run time. One example is the
* debug device. Those virtual devices have to be listed in the config
* file under some static bus in order to be enumerated at run time.
*
* @param bus Pointer to the device to which the static buses are attached to.
*/
void enable_static_devices(struct device *bus)
{
struct device *child;
struct bus *link;
for (link = bus->link_list; link; link = link->next) {
for (child = link->children; child; child = child->sibling) {
enable_static_device(child);
}
}
}
void scan_generic_bus(struct device *bus)
{
struct device *child;
struct bus *link;
static int bus_max = 0;
printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
for (link = bus->link_list; link; link = link->next) {
link->secondary = ++bus_max;
for (child = link->children; child; child = child->sibling) {
enable_static_device(child);
printk(BIOS_DEBUG, "bus: %s[%d]->", dev_path(child->bus->dev),
child->bus->link_num);
}
}
printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
}
void scan_smbus(struct device *bus)
{
scan_generic_bus(bus);
}
/*
* Default scan_bus() implementation
*
* This is the default implementation for buses that can't
* be probed at runtime. It simply walks through the topology
* given by the mainboard's `devicetree.cb`.
*
* First, all direct descendants of the given device are
* enabled. Then, downstream buses are scanned.
*/
void scan_static_bus(struct device *bus)
{
struct bus *link;
printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
enable_static_devices(bus);
for (link = bus->link_list; link; link = link->next)
scan_bridges(link);
printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
}
static void root_dev_reset(struct bus *bus)
{
printk(BIOS_INFO, "Resetting board...\n");
board_reset();
}
#if CONFIG(HAVE_ACPI_TABLES)
static const char *root_dev_acpi_name(const struct device *dev)
{
return "\\_SB";
}
#endif
/**
* Default device operation for root device.
*
* This is the default device operation for root devices. These operations
* should be fully usable as is. However the chip_operations::enable_dev()
* of a motherboard can override this if you want non-default behavior.
*/
struct device_operations default_dev_ops_root = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.scan_bus = scan_static_bus,
.reset_bus = root_dev_reset,
#if CONFIG(HAVE_ACPI_TABLES)
.acpi_name = root_dev_acpi_name,
#endif
};
|
