LXR uboot/drivers/pci/pci_auto

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * PCI auto-configuration library
   4 *
   5 * Author: Matt Porter <mporter@mvista.com>
   6 *
   7 * Copyright 2000 MontaVista Software Inc.
   8 *
   9 * Modifications for driver model:
  10 * Copyright 2015 Google, Inc
  11 * Written by Simon Glass <sjg@chromium.org>
  12 */
  13
  14#include <common.h>
  15#include <dm.h>
  16#include <errno.h>
  17#include <log.h>
  18#include <pci.h>
  19
  20void pciauto_region_init(struct pci_region *res)
  21{
  22        /*
  23         * Avoid allocating PCI resources from address 0 -- this is illegal
  24         * according to PCI 2.1 and moreover, this is known to cause Linux IDE
  25         * drivers to fail. Use a reasonable starting value of 0x1000 instead
  26         * if the bus start address is below 0x1000.
  27         */
  28        res->bus_lower = res->bus_start < 0x1000 ? 0x1000 : res->bus_start;
  29}
  30
  31void pciauto_region_align(struct pci_region *res, pci_size_t size)
  32{
  33        res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
  34}
  35
  36int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
  37        pci_addr_t *bar, bool supports_64bit)
  38{
  39        pci_addr_t addr;
  40
  41        if (!res) {
  42                debug("No resource\n");
  43                goto error;
  44        }
  45
  46        addr = ((res->bus_lower - 1) | (size - 1)) + 1;
  47
  48        if (addr - res->bus_start + size > res->size) {
  49                debug("No room in resource, avail start=%llx / size=%llx, "
  50                      "need=%llx\n", (unsigned long long)res->bus_lower,
  51                      (unsigned long long)res->size, (unsigned long long)size);
  52                goto error;
  53        }
  54
  55        if (upper_32_bits(addr) && !supports_64bit) {
  56                debug("Cannot assign 64-bit address to 32-bit-only resource\n");
  57                goto error;
  58        }
  59
  60        res->bus_lower = addr + size;
  61
  62        debug("address=0x%llx bus_lower=0x%llx\n", (unsigned long long)addr,
  63              (unsigned long long)res->bus_lower);
  64
  65        *bar = addr;
  66        return 0;
  67
  68 error:
  69        *bar = (pci_addr_t)-1;
  70        return -1;
  71}
  72
  73static void pciauto_show_region(const char *name, struct pci_region *region)
  74{
  75        pciauto_region_init(region);
  76        debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n"
  77              "\t\tPhysical Memory [%llx-%llxx]\n", name,
  78              (unsigned long long)region->bus_start,
  79              (unsigned long long)(region->bus_start + region->size - 1),
  80              (unsigned long long)region->phys_start,
  81              (unsigned long long)(region->phys_start + region->size - 1));
  82}
  83
  84void pciauto_config_init(struct pci_controller *hose)
  85{
  86        int i;
  87
  88        hose->pci_io = NULL;
  89        hose->pci_mem = NULL;
  90        hose->pci_prefetch = NULL;
  91
  92        for (i = 0; i < hose->region_count; i++) {
  93                switch (hose->regions[i].flags) {
  94                case PCI_REGION_IO:
  95                        if (!hose->pci_io ||
  96                            hose->pci_io->size < hose->regions[i].size)
  97                                hose->pci_io = hose->regions + i;
  98                        break;
  99                case PCI_REGION_MEM:
 100                        if (!hose->pci_mem ||
 101                            hose->pci_mem->size < hose->regions[i].size)
 102                                hose->pci_mem = hose->regions + i;
 103                        break;
 104                case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
 105                        if (!hose->pci_prefetch ||
 106                            hose->pci_prefetch->size < hose->regions[i].size)
 107                                hose->pci_prefetch = hose->regions + i;
 108                        break;
 109                }
 110        }
 111
 112
 113        if (hose->pci_mem)
 114                pciauto_show_region("Memory", hose->pci_mem);
 115        if (hose->pci_prefetch)
 116                pciauto_show_region("Prefetchable Mem", hose->pci_prefetch);
 117        if (hose->pci_io)
 118                pciauto_show_region("I/O", hose->pci_io);
 119}
 120