summaryrefslogtreecommitdiff
path: root/src/device/device_const.c
blob: ee64bd13e6047b8d22290b3ab81ff441c3a5ef62 (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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2003-2004 Linux Networx
 * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
 * Copyright (C) 2003 Greg Watson <jarrah@users.sourceforge.net>
 * Copyright (C) 2004 Li-Ta Lo <ollie@lanl.gov>
 * Copyright (C) 2005-2006 Tyan
 * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
 *
 * 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/path.h>
#include <device/pci.h>
#include <device/resource.h>

/** Linked list of ALL devices */
DEVTREE_CONST struct device * DEVTREE_CONST all_devices = &dev_root;

/**
 * Given a PCI bus and a devfn number, find the device structure.
 *
 * @param bus The bus number.
 * @param devfn A device/function number.
 * @return Pointer to the device structure (if found), 0 otherwise.
 */
DEVTREE_CONST struct device *dev_find_slot(unsigned int bus,
						unsigned int devfn)
{
	DEVTREE_CONST struct device *dev, *result;

	result = 0;
	for (dev = all_devices; dev; dev = dev->next) {
		if ((dev->path.type == DEVICE_PATH_PCI) &&
		    (dev->bus->secondary == bus) &&
		    (dev->path.pci.devfn == devfn)) {
			result = dev;
			break;
		}
	}
	return result;
}

/**
 * Given a Device Path Type, find the device structure.
 *
 * @param prev_match The previously matched device instance.
 * @param path_type The Device Path Type.
 * @return Pointer to the device structure (if found), 0 otherwise.
 */
DEVTREE_CONST struct device *dev_find_path(
		DEVTREE_CONST struct device *prev_match,
		enum device_path_type path_type)
{
	DEVTREE_CONST struct device *dev, *result = NULL;

	if (prev_match == NULL)
		prev_match = all_devices;
	else
		prev_match = prev_match->next;

	for (dev = prev_match; dev; dev = dev->next) {
		if (dev->path.type == path_type) {
			result = dev;
			break;
		}
	}
	return result;
}

/**
 * Given a device pointer, find the next PCI device.
 *
 * @param previous_dev A pointer to a PCI device structure.
 * @return Pointer to the next device structure (if found), 0 otherwise.
 */
DEVTREE_CONST struct device *dev_find_next_pci_device(
		DEVTREE_CONST struct device *previous_dev)
{
	return dev_find_path(previous_dev, DEVICE_PATH_PCI);
}

static int path_eq(const struct device_path *path1,
		const struct device_path *path2)
{
	int equal = 0;

	if (path1->type != path2->type)
		return 0;

	switch (path1->type) {
	case DEVICE_PATH_NONE:
		break;
	case DEVICE_PATH_ROOT:
		equal = 1;
		break;
	case DEVICE_PATH_PCI:
		equal = (path1->pci.devfn == path2->pci.devfn);
		break;
	case DEVICE_PATH_PNP:
		equal = (path1->pnp.port == path2->pnp.port) &&
			(path1->pnp.device == path2->pnp.device);
		break;
	case DEVICE_PATH_I2C:
		equal = (path1->i2c.device == path2->i2c.device) &&
			(path1->i2c.mode_10bit == path2->i2c.mode_10bit);
		break;
	case DEVICE_PATH_APIC:
		equal = (path1->apic.apic_id == path2->apic.apic_id);
		break;
	case DEVICE_PATH_DOMAIN:
		equal = (path1->domain.domain == path2->domain.domain);
		break;
	case DEVICE_PATH_CPU_CLUSTER:
		equal = (path1->cpu_cluster.cluster
			 == path2->cpu_cluster.cluster);
		break;
	case DEVICE_PATH_CPU:
		equal = (path1->cpu.id == path2->cpu.id);
		break;
	case DEVICE_PATH_CPU_BUS:
		equal = (path1->cpu_bus.id == path2->cpu_bus.id);
		break;
	case DEVICE_PATH_GENERIC:
		equal = (path1->generic.id == path2->generic.id) &&
			(path1->generic.subid == path2->generic.subid);
		break;
	case DEVICE_PATH_SPI:
		equal = (path1->spi.cs == path2->spi.cs);
		break;
	case DEVICE_PATH_USB:
		equal = (path1->usb.port_type == path2->usb.port_type) &&
			(path1->usb.port_id == path2->usb.port_id);
		break;
	case DEVICE_PATH_MMIO:
		equal = (path1->mmio.addr == path2->mmio.addr);
		break;
	default:
		printk(BIOS_ERR, "Unknown device type: %d\n", path1->type);
		break;
	}

	return equal;
}

/**
 * See if a device structure exists for path.
 *
 * @param parent The bus to find the device on.
 * @param path The relative path from the bus to the appropriate device.
 * @return Pointer to a device structure for the device on bus at path
 *         or 0/NULL if no device is found.
 */
DEVTREE_CONST struct device *find_dev_path(
	const struct bus *parent, const struct device_path *path)
{
	DEVTREE_CONST struct device *child;
	for (child = parent->children; child; child = child->sibling) {
		if (path_eq(path, &child->path))
			break;
	}
	return child;
}

/**
 * Given an SMBus bus and a device number, find the device structure.
 *
 * @param bus The bus number.
 * @param addr A device number.
 * @return Pointer to the device structure (if found), 0 otherwise.
 */
DEVTREE_CONST struct device *dev_find_slot_on_smbus(unsigned int bus,
							unsigned int addr)
{
	DEVTREE_CONST struct device *dev, *result;

	result = 0;
	for (dev = all_devices; dev; dev = dev->next) {
		if ((dev->path.type == DEVICE_PATH_I2C) &&
		    (dev->bus->secondary == bus) &&
		    (dev->path.i2c.device == addr)) {
			result = dev;
			break;
		}
	}
	return result;
}

/**
 * Given a PnP port and a device number, find the device structure.
 *
 * @param port The I/O port.
 * @param device Logical device number.
 * @return Pointer to the device structure (if found), 0 otherwise.
 */
DEVTREE_CONST struct device *dev_find_slot_pnp(u16 port, u16 device)
{
	DEVTREE_CONST struct device *dev;

	for (dev = all_devices; dev; dev = dev->next) {
		if ((dev->path.type == DEVICE_PATH_PNP) &&
		    (dev->path.pnp.port == port) &&
		    (dev->path.pnp.device == device)) {
			return dev;
		}
	}
	return 0;
}