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,
32 * that encompass the resources for the entire system.
33 * @param root Pointer to the device structure for the system root device
35 void root_dev_read_resources(device_t root)
37 printk_err("%s should never be called.\n", __func__);
41 * @brief Write the resources for every device
43 * Write the resources for the root device,
44 * and every device under it which are all of the devices.
45 * @param root Pointer to the device structure for the system root device
47 void root_dev_set_resources(device_t root)
49 printk_err("%s should never be called.\n", __func__);
53 * @brief Scan devices on static buses.
55 * The enumeration of certain buses is purely static. The existence of
56 * devices on those buses can be completely determined at compile time
57 * and is specified in the config file. Typical examples are the 'PNP'
58 * devices on a legacy ISA/LPC bus. There is no need of probing of any kind,
59 * the only thing we have to do is to walk through the bus and
60 * enable or disable devices as indicated in the config file.
62 * On the other hand, some devices are virtual and their existence is
63 * artificial. They can not be probed at run time. One example is the
64 * debug device. Those virtual devices have to be listed in the config
65 * file under some static bus in order to be enumerated at run time.
67 * This function is the default scan_bus() method for the root device and
70 * @param bus Pointer to the device structure which the static buses are attached
71 * @param max Maximum bus number currently used before scanning.
72 * @return Largest bus number used.
74 static int smbus_max = 0;
75 unsigned int scan_static_bus(device_t bus, unsigned int max)
80 printk_spew("%s for %s\n", __func__, dev_path(bus));
82 for(link = 0; link < bus->links; link++) {
83 /* for smbus bus enumerate */
84 child = bus->link[link].children;
85 if(child && child->path.type == DEVICE_PATH_I2C) {
86 bus->link[link].secondary = ++smbus_max;
88 for(child = bus->link[link].children; child; child = child->sibling) {
89 if (child->chip_ops && child->chip_ops->enable_dev) {
90 child->chip_ops->enable_dev(child);
92 if (child->ops && child->ops->enable) {
93 child->ops->enable(child);
95 if (child->path.type == DEVICE_PATH_I2C) {
96 printk_debug("smbus: %s[%d]->",
97 dev_path(child->bus->dev), child->bus->link );
99 printk_debug("%s %s\n",
101 child->enabled?"enabled": "disabled");
104 for(link = 0; link < bus->links; link++) {
105 for(child = bus->link[link].children; child; child = child->sibling) {
106 if (!child->ops || !child->ops->scan_bus)
108 printk_spew("%s scanning...\n", dev_path(child));
109 max = scan_bus(child, max);
113 printk_spew("%s for %s done\n", __func__, dev_path(bus));
119 * @brief Enable resources for children devices
121 * @param dev the device whos children's resources are to be enabled
123 * This function is called by the global enable_resource() indirectly via the
124 * device_operation::enable_resources() method of devices.
126 * Indirect mutual recursion:
127 * enable_childrens_resources() -> enable_resources()
128 * enable_resources() -> device_operation::enable_resources()
129 * device_operation::enable_resources() -> enable_children_resources()
131 void enable_childrens_resources(device_t dev)
134 for(link = 0; link < dev->links; link++) {
136 for(child = dev->link[link].children; child; child = child->sibling) {
137 enable_resources(child);
142 void root_dev_enable_resources(device_t dev)
144 enable_childrens_resources(dev);
148 * @brief Scan root bus for generic systems
150 * @param root The root device structure
151 * @param max The current bus number scanned so far, usually 0x00
153 * This function is the default scan_bus() method of the root device.
155 unsigned int root_dev_scan_bus(device_t root, unsigned int max)
157 return scan_static_bus(root, max);
160 void root_dev_init(device_t root)
164 void root_dev_reset(struct bus *bus)
166 printk_info("Reseting board...\n");
171 * @brief Default device operation for root device
173 * This is the default device operation for root devices. These operations
174 * should be fully usable as is. However the chip_operations::enable_dev()
175 * of a motherboard can override this if you want non-default behavior.
177 struct device_operations default_dev_ops_root = {
178 .read_resources = root_dev_read_resources,
179 .set_resources = root_dev_set_resources,
180 .enable_resources = root_dev_enable_resources,
181 .init = root_dev_init,
182 .scan_bus = root_dev_scan_bus,
183 .reset_bus = root_dev_reset,