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/*
* 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 Ronald G. Minnich <rminnich@gmail.com>
* Copyright (C) 2004-2005 Li-Ta Lo <ollie@lanl.gov>
* Copyright (C) 2005 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <reset.h>
/**
* Read the resources for the root device,
* that encompass the resources for the entire system.
* @param root Pointer to the device structure for the system root device
*/
void root_dev_read_resources(device_t root)
{
printk(BIOS_ERR, "%s should never be called.\n", __func__);
}
/**
* @brief Write the resources for every device
*
* Write the resources for the root device,
* and every device under it which are all of the devices.
* @param root Pointer to the device structure for the system root device
*/
void root_dev_set_resources(device_t root)
{
printk(BIOS_ERR, "%s should never be called.\n", __func__);
}
/**
* @brief Scan 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.
*
* This function is the default scan_bus() method for the root device and
* LPC bridges.
*
* @param bus Pointer to the device structure which the static buses are attached
* @param max Maximum bus number currently used before scanning.
* @return Largest bus number used.
*/
static int smbus_max = 0;
unsigned int scan_static_bus(device_t bus, unsigned int max)
{
device_t child;
unsigned link;
printk(BIOS_SPEW, "%s for %s\n", __func__, dev_path(bus));
for(link = 0; link < bus->links; link++) {
/* for smbus bus enumerate */
child = bus->link[link].children;
if(child && child->path.type == DEVICE_PATH_I2C) {
bus->link[link].secondary = ++smbus_max;
}
for(child = bus->link[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);
}
if (child->path.type == DEVICE_PATH_I2C) {
printk(BIOS_DEBUG, "smbus: %s[%d]->",
dev_path(child->bus->dev), child->bus->link );
}
printk(BIOS_DEBUG, "%s %s\n",
dev_path(child),
child->enabled?"enabled": "disabled");
}
}
for(link = 0; link < bus->links; link++) {
for(child = bus->link[link].children; child; child = child->sibling) {
if (!child->ops || !child->ops->scan_bus)
continue;
printk(BIOS_SPEW, "%s scanning...\n", dev_path(child));
max = scan_bus(child, max);
}
}
printk(BIOS_SPEW, "%s for %s done\n", __func__, dev_path(bus));
return max;
}
/**
* @brief Enable resources for children devices
*
* @param dev the device whos children's resources are to be enabled
*
* This function is called by the global enable_resource() indirectly via the
* device_operation::enable_resources() method of devices.
*
* Indirect mutual recursion:
* enable_childrens_resources() -> enable_resources()
* enable_resources() -> device_operation::enable_resources()
* device_operation::enable_resources() -> enable_children_resources()
*/
void enable_childrens_resources(device_t dev)
{
unsigned link;
for(link = 0; link < dev->links; link++) {
device_t child;
for(child = dev->link[link].children; child; child = child->sibling) {
enable_resources(child);
}
}
}
void root_dev_enable_resources(device_t dev)
{
enable_childrens_resources(dev);
}
/**
* @brief Scan root bus for generic systems
*
* @param root The root device structure
* @param max The current bus number scanned so far, usually 0x00
*
* This function is the default scan_bus() method of the root device.
*/
unsigned int root_dev_scan_bus(device_t root, unsigned int max)
{
return scan_static_bus(root, max);
}
void root_dev_init(device_t root)
{
}
void root_dev_reset(struct bus *bus)
{
printk(BIOS_INFO, "Reseting board...\n");
hard_reset();
}
/**
* @brief 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 = root_dev_read_resources,
.set_resources = root_dev_set_resources,
.enable_resources = root_dev_enable_resources,
.init = root_dev_init,
.scan_bus = root_dev_scan_bus,
.reset_bus = root_dev_reset,
};
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