e9a271e32c
* subtractive resources * merging with the static device tree * more device types than just pci - The piece to watch out for is the new enable_resources method that was needed in all of the drivers git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1096 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
#include <console/console.h>
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#include <device/device.h>
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#include <device/pci.h>
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/**
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* Read the resources for the root device,
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* that encompase the resources for the entire system.
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* @param root Pointer to the device structure for the system root device
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*/
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void root_dev_read_resources(device_t root)
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{
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int res = 0;
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/* Initialize the system wide io space constraints */
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root->resource[res].base = 0x400;
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root->resource[res].size = 0;
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root->resource[res].align = 0;
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root->resource[res].gran = 0;
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root->resource[res].limit = 0xffffUL;
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root->resource[res].flags = IORESOURCE_IO;
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root->resource[res].index = 0;
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compute_allocate_resource(&root->link[0], &root->resource[res],
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IORESOURCE_IO, IORESOURCE_IO);
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res++;
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/* Initialize the system wide memory resources constraints */
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root->resource[res].base = 0;
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root->resource[res].size = 0;
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root->resource[res].align = 0;
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root->resource[res].gran = 0;
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root->resource[res].limit = 0xffffffffUL;
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root->resource[res].flags = IORESOURCE_MEM;
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root->resource[res].index = 1;
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compute_allocate_resource(&root->link[0], &root->resource[res],
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IORESOURCE_MEM, IORESOURCE_MEM);
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res++;
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root->resources = res;
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}
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/**
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* Write the resources for the root device,
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* and every device under it which are all of the devices.
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* @param root Pointer to the device structure for the system root device
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*/
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void root_dev_set_resources(device_t root)
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{
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struct bus *bus;
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bus = &root->link[0];
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compute_allocate_resource(bus,
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&root->resource[0], IORESOURCE_IO, IORESOURCE_IO);
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compute_allocate_resource(bus,
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&root->resource[1], IORESOURCE_MEM, IORESOURCE_MEM);
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assign_resources(bus);
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}
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/**
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* Walk through devices on the motherboard and scan for devices behind
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* them.
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* @param root Pointer to the device structure for the system root device
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* @param max Maximum bus number allowed in the system.
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* @return Largest bus number used.
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*/
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unsigned int walk_static_devices(device_t bus, unsigned int max)
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{
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device_t child;
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unsigned link;
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for(link = 0; link < bus->links; link++) {
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for(child = bus->link[link].children; child; child = child->sibling) {
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if (child->ops && child->ops->enable) {
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child->ops->enable(child);
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}
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printk_debug("%s %s\n",
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dev_path(child),
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child->enable?"enabled": "disabled");
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}
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}
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for(link = 0; link < bus->links; link++) {
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for(child = bus->link[link].children; child; child = child->sibling) {
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if (!child->ops || !child->ops->scan_bus)
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continue;
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printk_debug("%s scanning...\n", dev_path(child));
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max = child->ops->scan_bus(child, max);
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}
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}
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return max;
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}
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void enable_childrens_resources(device_t dev)
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{
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unsigned link;
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for(link = 0; link < dev->links; link++) {
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device_t child;
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for(child = dev->link[link].children; child; child = child->sibling) {
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enable_resources(child);
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}
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}
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}
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unsigned int root_dev_scan_pci_bus(device_t root, unsigned int max)
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{
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return pci_scan_bus(&root->link[0], 0, 0xff, max);
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}
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struct device_operations default_dev_ops_root = {
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.read_resources = root_dev_read_resources,
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.set_resources = root_dev_set_resources,
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.enable_resources = enable_childrens_resources,
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.init = 0,
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.scan_bus = root_dev_scan_pci_bus,
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};
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/**
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* This is the root of the device tree. A PCI tree always has
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* one bus, bus 0. Bus 0 contains devices and bridges.
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*/
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struct device dev_root = {
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.ops = &default_dev_ops_root,
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.bus = &dev_root.link[0],
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.links = 1,
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.link = {
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[0] = {
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.dev = &dev_root,
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.link = 0,
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},
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},
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};
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