Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Host bridge related code
 */
 
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/module.h>
 
#include "pci.h"
 
static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
{
<------>while (bus->parent)
<------><------>bus = bus->parent;
 
<------>return bus;
}
 
struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
{
<------>struct pci_bus *root_bus = find_pci_root_bus(bus);
 
<------>return to_pci_host_bridge(root_bus->bridge);
}
 
struct device *pci_get_host_bridge_device(struct pci_dev *dev)
{
<------>struct pci_bus *root_bus = find_pci_root_bus(dev->bus);
<------>struct device *bridge = root_bus->bridge;
 
<------>kobject_get(&bridge->kobj);
<------>return bridge;
}
 
void  pci_put_host_bridge_device(struct device *dev)
{
<------>kobject_put(&dev->kobj);
}
 
void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
<------><------><------><------> void (*release_fn)(struct pci_host_bridge *),
<------><------><------><------> void *release_data)
{
<------>bridge->release_fn = release_fn;
<------>bridge->release_data = release_data;
}
EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
 
void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
<------><------><------>     struct resource *res)
{
<------>struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
<------>struct resource_entry *window;
<------>resource_size_t offset = 0;
 
<------>resource_list_for_each_entry(window, &bridge->windows) {
<------><------>if (resource_contains(window->res, res)) {
<------><------><------>offset = window->offset;
<------><------><------>break;
<------><------>}
<------>}
 
<------>region->start = res->start - offset;
<------>region->end = res->end - offset;
}
EXPORT_SYMBOL(pcibios_resource_to_bus);
 
static bool region_contains(struct pci_bus_region *region1,
<------><------><------>    struct pci_bus_region *region2)
{
<------>return region1->start <= region2->start && region1->end >= region2->end;
}
 
void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
<------><------><------>     struct pci_bus_region *region)
{
<------>struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
<------>struct resource_entry *window;
<------>resource_size_t offset = 0;
 
<------>resource_list_for_each_entry(window, &bridge->windows) {
<------><------>struct pci_bus_region bus_region;
 
<------><------>if (resource_type(res) != resource_type(window->res))
<------><------><------>continue;
 
<------><------>bus_region.start = window->res->start - window->offset;
<------><------>bus_region.end = window->res->end - window->offset;
 
<------><------>if (region_contains(&bus_region, region)) {
<------><------><------>offset = window->offset;
<------><------><------>break;
<------><------>}
<------>}
 
<------>res->start = region->start + offset;
<------>res->end = region->end + offset;
}
EXPORT_SYMBOL(pcibios_bus_to_resource);