| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * PCI auto-configuration library |
| * |
| * Author: Matt Porter <mporter@mvista.com> |
| * |
| * Copyright 2000 MontaVista Software Inc. |
| * |
| * Modifications for driver model: |
| * Copyright 2015 Google, Inc |
| * Written by Simon Glass <sjg@chromium.org> |
| */ |
| |
| #include <common.h> |
| #include <dm.h> |
| #include <errno.h> |
| #include <pci.h> |
| |
| void pciauto_region_init(struct pci_region *res) |
| { |
| /* |
| * Avoid allocating PCI resources from address 0 -- this is illegal |
| * according to PCI 2.1 and moreover, this is known to cause Linux IDE |
| * drivers to fail. Use a reasonable starting value of 0x1000 instead. |
| */ |
| res->bus_lower = res->bus_start ? res->bus_start : 0x1000; |
| } |
| |
| void pciauto_region_align(struct pci_region *res, pci_size_t size) |
| { |
| res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1; |
| } |
| |
| int pciauto_region_allocate(struct pci_region *res, pci_size_t size, |
| pci_addr_t *bar) |
| { |
| pci_addr_t addr; |
| |
| if (!res) { |
| debug("No resource"); |
| goto error; |
| } |
| |
| addr = ((res->bus_lower - 1) | (size - 1)) + 1; |
| |
| if (addr - res->bus_start + size > res->size) { |
| debug("No room in resource"); |
| goto error; |
| } |
| |
| res->bus_lower = addr + size; |
| |
| debug("address=0x%llx bus_lower=0x%llx", (unsigned long long)addr, |
| (unsigned long long)res->bus_lower); |
| |
| *bar = addr; |
| return 0; |
| |
| error: |
| *bar = (pci_addr_t)-1; |
| return -1; |
| } |
| |
| static void pciauto_show_region(const char *name, struct pci_region *region) |
| { |
| pciauto_region_init(region); |
| debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n" |
| "\t\tPhysical Memory [%llx-%llxx]\n", name, |
| (unsigned long long)region->bus_start, |
| (unsigned long long)(region->bus_start + region->size - 1), |
| (unsigned long long)region->phys_start, |
| (unsigned long long)(region->phys_start + region->size - 1)); |
| } |
| |
| void pciauto_config_init(struct pci_controller *hose) |
| { |
| int i; |
| |
| hose->pci_io = NULL; |
| hose->pci_mem = NULL; |
| hose->pci_prefetch = NULL; |
| |
| for (i = 0; i < hose->region_count; i++) { |
| switch (hose->regions[i].flags) { |
| case PCI_REGION_IO: |
| if (!hose->pci_io || |
| hose->pci_io->size < hose->regions[i].size) |
| hose->pci_io = hose->regions + i; |
| break; |
| case PCI_REGION_MEM: |
| if (!hose->pci_mem || |
| hose->pci_mem->size < hose->regions[i].size) |
| hose->pci_mem = hose->regions + i; |
| break; |
| case (PCI_REGION_MEM | PCI_REGION_PREFETCH): |
| if (!hose->pci_prefetch || |
| hose->pci_prefetch->size < hose->regions[i].size) |
| hose->pci_prefetch = hose->regions + i; |
| break; |
| } |
| } |
| |
| |
| if (hose->pci_mem) |
| pciauto_show_region("Memory", hose->pci_mem); |
| if (hose->pci_prefetch) |
| pciauto_show_region("Prefetchable Mem", hose->pci_prefetch); |
| if (hose->pci_io) |
| pciauto_show_region("I/O", hose->pci_io); |
| } |