}
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_resources);
-/* This function tries to figure out if a bridge resource has been initialized
- * by the firmware or not. It doesn't have to be absolutely bullet proof, but
- * things go more smoothly when it gets it right. It should covers cases such
- * as Apple "closed" bridge resources and bare-metal pSeries unassigned bridges
- */
-static int pcibios_uninitialized_bridge_resource(struct pci_bus *bus,
- struct resource *res)
-{
- struct pci_controller *hose = pci_bus_to_host(bus);
- struct pci_dev *dev = bus->self;
- resource_size_t offset;
- u16 command;
- int i;
-
- /* Job is a bit different between memory and IO */
- if (res->flags & IORESOURCE_MEM) {
- /* If the BAR is non-0 (res != pci_mem_offset) then it's
- * probably been initialized by somebody
- */
- if (res->start != hose->pci_mem_offset)
- return 0;
-
- /* The BAR is 0, let's check if memory decoding is enabled on
- * the bridge. If not, we consider it unassigned
- */
- pci_read_config_word(dev, PCI_COMMAND, &command);
- if ((command & PCI_COMMAND_MEMORY) == 0)
- return 1;
-
- /* Memory decoding is enabled and the BAR is 0. If any of
- * the bridge resources covers that starting address (0 then
- * it's good enough for us for memory
- */
- for (i = 0; i < 3; i++) {
- if ((hose->mem_resources[i].flags & IORESOURCE_MEM) &&
- hose->mem_resources[i].start == hose->pci_mem_offset)
- return 0;
- }
-
- /* Well, it starts at 0 and we know it will collide so we may as
- * well consider it as unassigned. That covers the Apple case.
- */
- return 1;
- } else {
- /* If the BAR is non-0, then we consider it assigned */
- offset = (unsigned long)hose->io_base_virt - _IO_BASE;
- if (((res->start - offset) & 0xfffffffful) != 0)
- return 0;
-
- /* Here, we are a bit different than memory as typically IO
- * space starting at low addresses -is- valid. What we do
- * instead if that we consider as unassigned anything that
- * doesn't have IO enabled in the PCI command register,
- * and that's it.
- */
- pci_read_config_word(dev, PCI_COMMAND, &command);
- if (command & PCI_COMMAND_IO)
- return 0;
-
- /* It's starting at 0 and IO is disabled in the bridge, consider
- * it unassigned
- */
- return 1;
- }
-}
-
-/* Fixup resources of a PCI<->PCI bridge */
-static void pcibios_fixup_bridge(struct pci_bus *bus)
-{
- struct resource *res;
- int i;
-
- struct pci_dev *dev = bus->self;
-
- pci_bus_for_each_resource(bus, res, i) {
- if (!res)
- continue;
- if (!res->flags)
- continue;
- if (i >= 3 && bus->self->transparent)
- continue;
-
- pr_debug("PCI:%s Bus rsrc %d %016llx-%016llx [%x] fixup...\n",
- pci_name(dev), i,
- (unsigned long long)res->start,
- (unsigned long long)res->end,
- (unsigned int)res->flags);
-
- /* Try to detect uninitialized P2P bridge resources,
- * and clear them out so they get re-assigned later
- */
- if (pcibios_uninitialized_bridge_resource(bus, res)) {
- res->flags = 0;
- pr_debug("PCI:%s (unassigned)\n",
- pci_name(dev));
- } else {
- pr_debug("PCI:%s %016llx-%016llx\n",
- pci_name(dev),
- (unsigned long long)res->start,
- (unsigned long long)res->end);
- }
- }
-}
-
-void pcibios_setup_bus_self(struct pci_bus *bus)
-{
- /* Fix up the bus resources for P2P bridges */
- if (bus->self != NULL)
- pcibios_fixup_bridge(bus);
-}
-
-void pcibios_setup_bus_devices(struct pci_bus *bus)
-{
- struct pci_dev *dev;
-
- pr_debug("PCI: Fixup bus devices %d (%s)\n",
- bus->number, bus->self ? pci_name(bus->self) : "PHB");
-
- list_for_each_entry(dev, &bus->devices, bus_list) {
- /* Setup OF node pointer in archdata */
- dev->dev.of_node = pci_device_to_OF_node(dev);
-
- /* Fixup NUMA node as it may not be setup yet by the generic
- * code and is needed by the DMA init
- */
- set_dev_node(&dev->dev, pcibus_to_node(dev->bus));
-
- /* Read default IRQs and fixup if necessary */
- dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
- }
-}
-
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
- /* nothing to do */
-}
-EXPORT_SYMBOL(pcibios_fixup_bus);
-
/*
* We need to avoid collisions with `mirrored' VGA ports
* and other strange ISA hardware, so we always want the
* but we want to try to avoid allocating at 0x2900-0x2bff
* which might have be mirrored at 0x0100-0x03ff..
*/
-resource_size_t pcibios_align_resource(void *data, const struct resource *res,
- resource_size_t size, resource_size_t align)
-{
- return res->start;
-}
-EXPORT_SYMBOL(pcibios_align_resource);
-
int pcibios_add_device(struct pci_dev *dev)
{
dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
projects / mirror_ubuntu-bionic-kernel.git / blobdiff