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#include <console/console.h>
#include <device/device.h>
#include <device/pci.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)
{
struct resource *resource;
/* Initialize the system wide io space constraints */
resource = new_resource(root, 0);
resource->base = 0x400;
resource->size = 0;
resource->align = 0;
resource->gran = 0;
resource->limit = 0xffffUL;
resource->flags = IORESOURCE_IO;
compute_allocate_resource(&root->link[0], resource,
IORESOURCE_IO, IORESOURCE_IO);
/* Initialize the system wide memory resources constraints */
resource = new_resource(root, 1);
resource->base = 0;
resource->size = 0;
resource->align = 0;
resource->gran = 0;
resource->limit = 0xffffffffUL;
resource->flags = IORESOURCE_MEM;
compute_allocate_resource(&root->link[0], resource,
IORESOURCE_MEM, IORESOURCE_MEM);
}
/**
* @brief 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)
{
struct bus *bus;
bus = &root->link[0];
compute_allocate_resource(bus, &root->resource[0],
IORESOURCE_IO, IORESOURCE_IO);
compute_allocate_resource(bus, &root->resource[1],
IORESOURCE_MEM, IORESOURCE_MEM);
assign_resources(bus);
}
/**
* @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 exapmles 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 root Pointer to the root device which the static buses are attached
* @param max Maximum bus number currently used before scanning.
* @return Largest bus number used after scanning.
*/
unsigned int scan_static_bus(device_t root, unsigned int max)
{
device_t child;
unsigned link;
printk_spew("%s for %s\n", __func__, dev_path(root));
for (link = 0; link < root->links; link++) {
for (child = root->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);
}
printk_debug("%s %s\n", dev_path(child),
child->enabled?"enabled": "disabled");
}
}
for (link = 0; link < root->links; link++) {
for (child = root->link[link].children; child; child = child->sibling) {
if (!child->ops || !child->ops->scan_bus)
continue;
printk_spew("%s scanning...\n", dev_path(child));
max = child->ops->scan_bus(child, max);
}
}
printk_spew("%s for %s done\n", __func__, dev_path(root));
return max;
}
/**
* @brief Enable resources for children devices
*
* @param dev the device whos children's resources are to be enabled
*
* This function is call by the global enable_resources() 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)
{
}
/**
* @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,
};
/**
* @brief The root of device tree.
*
* This is the root of the device tree. The device tree is defined in the
* static.c file and is generated by config tool during compile time.
*/
extern struct device dev_root;
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