1 // SPDX-License-Identifier: GPL-2.0+
3 * PCI auto-configuration library
5 * Author: Matt Porter <mporter@mvista.com>
7 * Copyright 2000 MontaVista Software Inc.
9 * Modifications for driver model:
10 * Copyright 2015 Google, Inc
11 * Written by Simon Glass <sjg@chromium.org>
19 void pciauto_region_init(struct pci_region *res)
22 * Avoid allocating PCI resources from address 0 -- this is illegal
23 * according to PCI 2.1 and moreover, this is known to cause Linux IDE
24 * drivers to fail. Use a reasonable starting value of 0x1000 instead.
26 res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
29 void pciauto_region_align(struct pci_region *res, pci_size_t size)
31 res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
34 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
44 addr = ((res->bus_lower - 1) | (size - 1)) + 1;
46 if (addr - res->bus_start + size > res->size) {
47 debug("No room in resource");
51 res->bus_lower = addr + size;
53 debug("address=0x%llx bus_lower=0x%llx", (unsigned long long)addr,
54 (unsigned long long)res->bus_lower);
60 *bar = (pci_addr_t)-1;
64 static void pciauto_show_region(const char *name, struct pci_region *region)
66 pciauto_region_init(region);
67 debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n"
68 "\t\tPhysical Memory [%llx-%llxx]\n", name,
69 (unsigned long long)region->bus_start,
70 (unsigned long long)(region->bus_start + region->size - 1),
71 (unsigned long long)region->phys_start,
72 (unsigned long long)(region->phys_start + region->size - 1));
75 void pciauto_config_init(struct pci_controller *hose)
81 hose->pci_prefetch = NULL;
83 for (i = 0; i < hose->region_count; i++) {
84 switch (hose->regions[i].flags) {
87 hose->pci_io->size < hose->regions[i].size)
88 hose->pci_io = hose->regions + i;
92 hose->pci_mem->size < hose->regions[i].size)
93 hose->pci_mem = hose->regions + i;
95 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
96 if (!hose->pci_prefetch ||
97 hose->pci_prefetch->size < hose->regions[i].size)
98 hose->pci_prefetch = hose->regions + i;
105 pciauto_show_region("Memory", hose->pci_mem);
106 if (hose->pci_prefetch)
107 pciauto_show_region("Prefetchable Mem", hose->pci_prefetch);
109 pciauto_show_region("I/O", hose->pci_io);