94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
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/*
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* host bridge related code
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/module.h>
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#include "pci.h"
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static LIST_HEAD(pci_host_bridges);
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void add_to_pci_host_bridges(struct pci_host_bridge *bridge)
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{
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list_add_tail(&bridge->list, &pci_host_bridges);
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}
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static struct pci_host_bridge *pci_host_bridge(struct pci_dev *dev)
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{
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struct pci_bus *bus;
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struct pci_host_bridge *bridge;
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bus = dev->bus;
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while (bus->parent)
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bus = bus->parent;
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list_for_each_entry(bridge, &pci_host_bridges, list) {
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if (bridge->bus == bus)
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return bridge;
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}
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return NULL;
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}
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static bool resource_contains(struct resource *res1, struct resource *res2)
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{
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return res1->start <= res2->start && res1->end >= res2->end;
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}
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void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
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struct resource *res)
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{
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struct pci_host_bridge *bridge = pci_host_bridge(dev);
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struct pci_host_bridge_window *window;
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resource_size_t offset = 0;
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list_for_each_entry(window, &bridge->windows, list) {
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if (resource_type(res) != resource_type(window->res))
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continue;
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if (resource_contains(window->res, res)) {
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offset = window->offset;
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break;
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}
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}
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region->start = res->start - offset;
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region->end = res->end - offset;
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}
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EXPORT_SYMBOL(pcibios_resource_to_bus);
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static bool region_contains(struct pci_bus_region *region1,
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struct pci_bus_region *region2)
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{
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return region1->start <= region2->start && region1->end >= region2->end;
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}
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void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
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struct pci_bus_region *region)
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{
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struct pci_host_bridge *bridge = pci_host_bridge(dev);
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struct pci_host_bridge_window *window;
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struct pci_bus_region bus_region;
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resource_size_t offset = 0;
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list_for_each_entry(window, &bridge->windows, list) {
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if (resource_type(res) != resource_type(window->res))
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continue;
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bus_region.start = window->res->start - window->offset;
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bus_region.end = window->res->end - window->offset;
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if (region_contains(&bus_region, region)) {
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offset = window->offset;
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break;
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}
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}
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res->start = region->start + offset;
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res->end = region->end + offset;
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}
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EXPORT_SYMBOL(pcibios_bus_to_resource);
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