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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)
{
int res = 0;
/* Initialize the system wide io space constraints */
root->resource[res].base = 0x400;
root->resource[res].size = 0;
root->resource[res].align = 0;
root->resource[res].gran = 0;
root->resource[res].limit = 0xffffUL;
root->resource[res].flags = IORESOURCE_IO;
root->resource[res].index = 0;
compute_allocate_resource(&root->link[0], &root->resource[res],
IORESOURCE_IO, IORESOURCE_IO);
res++;
/* Initialize the system wide memory resources constraints */
root->resource[res].base = 0;
root->resource[res].size = 0;
root->resource[res].align = 0;
root->resource[res].gran = 0;
root->resource[res].limit = 0xffffffffUL;
root->resource[res].flags = IORESOURCE_MEM;
root->resource[res].index = 1;
compute_allocate_resource(&root->link[0], &root->resource[res],
IORESOURCE_MEM, IORESOURCE_MEM);
res++;
root->resources = res;
printk_spew("%s DONE\n", __func__);
}
/**
* 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
* by the config file. Typical expamles 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.
*
* This function is the default scan_bus() method for LPC bridges.
*
* @param root Pointer to the device structure for the system root device
* @param max Maximum bus number allowed in the system.
* @return Largest bus number used.
*/
unsigned int scan_static_bus(device_t bus, unsigned int max)
{
device_t child;
unsigned link;
printk_debug("%s for %s\n", __func__, dev_path(bus));
for(link = 0; link < bus->links; link++) {
for(child = bus->link[link].children; child; child = child->sibling) {
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 < bus->links; link++) {
for(child = bus->link[link].children; child; child = child->sibling) {
if (!child->ops || !child->ops->scan_bus)
continue;
printk_debug("%s scanning...\n", dev_path(child));
max = child->ops->scan_bus(child, max);
}
}
printk_debug("%s done\n", __func__);
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 enable_resource() indirectly via the
* enable_resources() method of devices.
*
* Indirect mutual recursion:
*/
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);
}
}
}
/**
* @brief Scan root bus for generic PCI systems
*
* @param root The root device structure
* @param max The current bus number scanned so fat, usually 0x00
*
* This function is the default scan_bus() method of the dynamic root device.
* The bus heirachy is rooted at the host/northbridge. The northbridge of a
* generic PCI bus system is at Bus 0, Dev 0, Fun 0 so we scan the whole PCI
* buses from there.
*/
unsigned int root_dev_scan_pci_bus(device_t root, unsigned int max)
{
return pci_scan_bus(&root->link[0], 0, 0xff, max);
}
/**
* @brief Default device operation for root device
*
* This is the default device operation for root devices in PCI based systems.
* The static enumeration code chip_control::enumerate() of mainboards usually
* override this operation with their own device operations. An notable
* example is mainboard operations for AMD K8 mainboards. They replace the
* scan_bus() method with amdk8_scan_root_bus() due to the special device
* layout of AMD K8 systems.
*/
struct device_operations default_dev_ops_root = {
.read_resources = root_dev_read_resources,
.set_resources = root_dev_set_resources,
.enable_resources = enable_childrens_resources,
.init = 0,
.scan_bus = root_dev_scan_pci_bus,
};
/**
* @brief The root of dynamic device tree.
*
* This is the root of the dynamic device tree. A PCI tree always has
* one bus, bus 0. Bus 0 contains devices and bridges.
*/
struct device dev_root = {
.ops = &default_dev_ops_root,
.bus = &dev_root.link[0],
.path = { .type = DEVICE_PATH_ROOT },
.enabled = 1,
.links = 1,
.link = {
[0] = {
.dev = &dev_root,
.link = 0,
},
},
};
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