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
25 * if the bus start address is below 0x1000.
27 res->bus_lower = res->bus_start < 0x1000 ? 0x1000 : res->bus_start;
30 void pciauto_region_align(struct pci_region *res, pci_size_t size)
32 res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
35 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
36 pci_addr_t *bar, bool supports_64bit)
41 debug("No resource\n");
45 addr = ((res->bus_lower - 1) | (size - 1)) + 1;
47 if (addr - res->bus_start + size > res->size) {
48 debug("No room in resource");
52 if (upper_32_bits(addr) && !supports_64bit) {
53 debug("Cannot assign 64-bit address to 32-bit-only resource\n");
57 res->bus_lower = addr + size;
59 debug("address=0x%llx bus_lower=0x%llx\n", (unsigned long long)addr,
60 (unsigned long long)res->bus_lower);
66 *bar = (pci_addr_t)-1;
70 static void pciauto_show_region(const char *name, struct pci_region *region)
72 pciauto_region_init(region);
73 debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n"
74 "\t\tPhysical Memory [%llx-%llxx]\n", name,
75 (unsigned long long)region->bus_start,
76 (unsigned long long)(region->bus_start + region->size - 1),
77 (unsigned long long)region->phys_start,
78 (unsigned long long)(region->phys_start + region->size - 1));
81 void pciauto_config_init(struct pci_controller *hose)
87 hose->pci_prefetch = NULL;
89 for (i = 0; i < hose->region_count; i++) {
90 switch (hose->regions[i].flags) {
93 hose->pci_io->size < hose->regions[i].size)
94 hose->pci_io = hose->regions + i;
98 hose->pci_mem->size < hose->regions[i].size)
99 hose->pci_mem = hose->regions + i;
101 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
102 if (!hose->pci_prefetch ||
103 hose->pci_prefetch->size < hose->regions[i].size)
104 hose->pci_prefetch = hose->regions + i;
111 pciauto_show_region("Memory", hose->pci_mem);
112 if (hose->pci_prefetch)
113 pciauto_show_region("Prefetchable Mem", hose->pci_prefetch);
115 pciauto_show_region("I/O", hose->pci_io);