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>
28 #include <part/hard_reset.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 struct resource *resource;
39 /* Initialize the system wide io space constraints */
40 resource = new_resource(root, 0);
41 resource->base = 0x400;
45 resource->limit = 0xffffUL;
46 resource->flags = IORESOURCE_IO;
47 compute_allocate_resource(&root->link[0], resource,
48 IORESOURCE_IO, IORESOURCE_IO);
50 /* Initialize the system wide memory resources constraints */
51 resource = new_resource(root, 1);
56 resource->limit = 0xffffffffUL;
57 resource->flags = IORESOURCE_MEM;
58 compute_allocate_resource(&root->link[0], resource,
59 IORESOURCE_MEM, IORESOURCE_MEM);
63 * @brief Write the resources for every device
65 * Write the resources for the root device,
66 * and every device under it which are all of the devices.
67 * @param root Pointer to the device structure for the system root device
69 void root_dev_set_resources(device_t root)
74 compute_allocate_resource(bus,
75 &root->resource[0], IORESOURCE_IO, IORESOURCE_IO);
76 compute_allocate_resource(bus,
77 &root->resource[1], IORESOURCE_MEM, IORESOURCE_MEM);
78 assign_resources(bus);
82 * @brief Scan devices on static buses.
84 * The enumeration of certain buses is purely static. The existence of
85 * devices on those buses can be completely determined at compile time
86 * and is specified in the config file. Typical examples are the 'PNP'
87 * devices on a legacy ISA/LPC bus. There is no need of probing of any kind,
88 * the only thing we have to do is to walk through the bus and
89 * enable or disable devices as indicated in the config file.
91 * On the other hand, some devices are virtual and their existence is
92 * artificial. They can not be probed at run time. One example is the
93 * debug device. Those virtual devices have to be listed in the config
94 * file under some static bus in order to be enumerated at run time.
96 * This function is the default scan_bus() method for the root device and
99 * @param bus Pointer to the device structure which the static buses are attached
100 * @param max Maximum bus number currently used before scanning.
101 * @return Largest bus number used.
103 static int smbus_max = 0;
104 unsigned int scan_static_bus(device_t bus, unsigned int max)
109 printk_spew("%s for %s\n", __func__, dev_path(bus));
111 for(link = 0; link < bus->links; link++) {
112 /* for smbus bus enumerate */
113 child = bus->link[link].children;
114 if(child && child->path.type == DEVICE_PATH_I2C) {
115 bus->link[link].secondary = ++smbus_max;
117 for(child = bus->link[link].children; child; child = child->sibling) {
118 if (child->chip_ops && child->chip_ops->enable_dev) {
119 child->chip_ops->enable_dev(child);
121 if (child->ops && child->ops->enable) {
122 child->ops->enable(child);
124 if (child->path.type == DEVICE_PATH_I2C) {
125 printk_debug("smbus: %s[%d]->",
126 dev_path(child->bus->dev), child->bus->link );
128 printk_debug("%s %s\n",
130 child->enabled?"enabled": "disabled");
133 for(link = 0; link < bus->links; link++) {
134 for(child = bus->link[link].children; child; child = child->sibling) {
135 if (!child->ops || !child->ops->scan_bus)
137 printk_spew("%s scanning...\n", dev_path(child));
138 max = scan_bus(child, max);
142 printk_spew("%s for %s done\n", __func__, dev_path(bus));
148 * @brief Enable resources for children devices
150 * @param dev the device whos children's resources are to be enabled
152 * This function is called by the global enable_resource() indirectly via the
153 * device_operation::enable_resources() method of devices.
155 * Indirect mutual recursion:
156 * enable_childrens_resources() -> enable_resources()
157 * enable_resources() -> device_operation::enable_resources()
158 * device_operation::enable_resources() -> enable_children_resources()
160 void enable_childrens_resources(device_t dev)
163 for(link = 0; link < dev->links; link++) {
165 for(child = dev->link[link].children; child; child = child->sibling) {
166 enable_resources(child);
171 void root_dev_enable_resources(device_t dev)
173 enable_childrens_resources(dev);
177 * @brief Scan root bus for generic systems
179 * @param root The root device structure
180 * @param max The current bus number scanned so far, usually 0x00
182 * This function is the default scan_bus() method of the root device.
184 unsigned int root_dev_scan_bus(device_t root, unsigned int max)
186 return scan_static_bus(root, max);
189 void root_dev_init(device_t root)
193 void root_dev_reset(struct bus *bus)
195 printk_info("Reseting board...\n");
200 * @brief Default device operation for root device
202 * This is the default device operation for root devices. These operations
203 * should be fully usable as is. However the chip_operations::enable_dev()
204 * of a motherboard can override this if you want non-default behavior.
206 struct device_operations default_dev_ops_root = {
207 .read_resources = root_dev_read_resources,
208 .set_resources = root_dev_set_resources,
209 .enable_resources = root_dev_enable_resources,
210 .init = root_dev_init,
211 .scan_bus = root_dev_scan_bus,
212 .reset_bus = root_dev_reset,
216 * @brief The root of device tree.
218 * This is the root of the device tree. The device tree is defined in the
219 * static.c file and is generated by config tool during compile time.
221 extern struct device dev_root;