summaryrefslogtreecommitdiff
path: root/src/device/root_device.c
blob: 05809144806df1b9771642d8b5b12805e0683cc7 (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
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
159
160
161
162
163
164
165
166
167
168
169
170
/*
 * This file is part of the coreboot project.
 *
 * 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; version 2 of the License.
 *
 * 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 <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;

/**
 * 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) {

			if (child->chip_ops && child->chip_ops->enable_dev)
				child->chip_ops->enable_dev(child);

			if (child->ops && child->ops->enable)
				child->ops->enable(child);

			printk(BIOS_DEBUG, "%s %s\n", dev_path(child),
			       child->enabled ? "enabled" : "disabled");
		}
	}
}

void scan_lpc_bus(struct device *bus)
{
	printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));

	enable_static_devices(bus);

	printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
}

void scan_usb_bus(struct device *bus)
{
	struct bus *link;

	printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));

	enable_static_devices(bus);

	/* Scan bridges in case this device is a hub */
	for (link = bus->link_list; link; link = link->next)
		scan_bridges(link);

	printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
}

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) {

			if (child->chip_ops && child->chip_ops->enable_dev)
				child->chip_ops->enable_dev(child);

			if (child->ops && child->ops->enable)
				child->ops->enable(child);

			printk(BIOS_DEBUG, "bus: %s[%d]->", dev_path(child->bus->dev),
			       child->bus->link_num);

			printk(BIOS_DEBUG, "%s %s\n", dev_path(child),
			       child->enabled ? "enabled" : "disabled");
		}
	}

	printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
}

void scan_smbus(struct device *bus)
{
	scan_generic_bus(bus);
}

/**
 * Scan root bus for generic systems.
 *
 * This function is the default scan_bus() method of the root device.
 *
 * @param root The root device structure.
 */
static void root_dev_scan_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   = DEVICE_NOOP,
	.set_resources    = DEVICE_NOOP,
	.enable_resources = DEVICE_NOOP,
	.init             = DEVICE_NOOP,
	.scan_bus         = root_dev_scan_bus,
	.reset_bus        = root_dev_reset,
#if CONFIG(HAVE_ACPI_TABLES)
	.acpi_name        = root_dev_acpi_name,
#endif
};