2 * This file is part of the coreboot project.
4 * Copyright (C) 2003-2004 Linux Networx
5 * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
6 * Copyright (C) 2003 Ronald G. Minnich <rminnich@gmail.com>
7 * Copyright (C) 2004-2005 Li-Ta Lo <ollie@lanl.gov>
8 * Copyright (C) 2005 Tyan
9 * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2 of the License.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 #include <console/console.h>
26 #include <device/device.h>
27 #include <device/pci.h>
31 * Read the resources for the root device, that encompass the resources for
34 * @param root Pointer to the device structure for the system root device.
36 static void root_dev_read_resources(device_t root)
38 printk(BIOS_ERR, "%s should never be called.\n", __func__);
42 * Write the resources for every device.
44 * Write the resources for the root device, and every device under it which
45 * are all of the devices.
47 * @param root Pointer to the device structure for the system root device.
49 static void root_dev_set_resources(device_t root)
51 printk(BIOS_ERR, "%s should never be called.\n", __func__);
55 * Scan devices on static buses.
57 * The enumeration of certain buses is purely static. The existence of
58 * devices on those buses can be completely determined at compile time
59 * and is specified in the config file. Typical examples are the 'PNP'
60 * devices on a legacy ISA/LPC bus. There is no need of probing of any kind,
61 * the only thing we have to do is to walk through the bus and
62 * enable or disable devices as indicated in the config file.
64 * On the other hand, some devices are virtual and their existence is
65 * artificial. They can not be probed at run time. One example is the
66 * debug device. Those virtual devices have to be listed in the config
67 * file under some static bus in order to be enumerated at run time.
69 * This function is the default scan_bus() method for the root device and
72 * @param bus Pointer to the device to which the static buses are attached to.
73 * @param max Maximum bus number currently used before scanning.
74 * @return The largest bus number used.
76 static int smbus_max = 0;
77 unsigned int scan_static_bus(device_t bus, unsigned int max)
82 printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
84 for (link = bus->link_list; link; link = link->next) {
85 /* For SMBus bus enumerate. */
86 child = link->children;
88 if (child && child->path.type == DEVICE_PATH_I2C)
89 link->secondary = ++smbus_max;
91 for (child = link->children; child; child = child->sibling) {
92 if (child->chip_ops && child->chip_ops->enable_dev)
93 child->chip_ops->enable_dev(child);
95 if (child->ops && child->ops->enable)
96 child->ops->enable(child);
98 if (child->path.type == DEVICE_PATH_I2C) {
99 printk(BIOS_DEBUG, "smbus: %s[%d]->",
100 dev_path(child->bus->dev),
101 child->bus->link_num);
103 printk(BIOS_DEBUG, "%s %s\n", dev_path(child),
104 child->enabled ? "enabled" : "disabled");
108 for (link = bus->link_list; link; link = link->next) {
109 for (child = link->children; child; child = child->sibling) {
110 if (!child->ops || !child->ops->scan_bus)
112 printk(BIOS_SPEW, "%s scanning...\n", dev_path(child));
113 max = scan_bus(child, max);
117 printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
122 static void root_dev_enable_resources(device_t dev)
127 * Scan root bus for generic systems.
129 * This function is the default scan_bus() method of the root device.
131 * @param root The root device structure.
132 * @param max The current bus number scanned so far, usually 0x00.
133 * @return The largest bus number used.
135 static unsigned int root_dev_scan_bus(device_t root, unsigned int max)
137 return scan_static_bus(root, max);
140 static void root_dev_init(device_t root)
144 static void root_dev_reset(struct bus *bus)
146 printk(BIOS_INFO, "Resetting board...\n");
151 * Default device operation for root device.
153 * This is the default device operation for root devices. These operations
154 * should be fully usable as is. However the chip_operations::enable_dev()
155 * of a motherboard can override this if you want non-default behavior.
157 struct device_operations default_dev_ops_root = {
158 .read_resources = root_dev_read_resources,
159 .set_resources = root_dev_set_resources,
160 .enable_resources = root_dev_enable_resources,
161 .init = root_dev_init,
162 .scan_bus = root_dev_scan_bus,
163 .reset_bus = root_dev_reset,