drivers/pci/pci_auto_common.c

   1 /*
   2  * PCI auto-configuration library
   3  *
   4  * Author: Matt Porter <mporter@mvista.com>
   5  *
   6  * Copyright 2000 MontaVista Software Inc.
   7  *
   8  * Modifications for driver model:
   9  * Copyright 2015 Google, Inc
  10  * Written by Simon Glass <sjg@chromium.org>
  11  *
  12  * SPDX-License-Identifier:     GPL-2.0+
  13  */
  14
  15 #include <common.h>
  16 #include <dm.h>
  17 #include <errno.h>
  18 #include <pci.h>
  19
  20 void 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          */
  27         res->bus_lower = res->bus_start ? res->bus_start : 0x1000;
  28 }
  29
  30 void pciauto_region_align(struct pci_region *res, pci_size_t size)
  31 {
  32         res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
  33 }
  34
  35 int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
  36         pci_addr_t *bar)
  37 {
  38         pci_addr_t addr;
  39
  40         if (!res) {
  41                 debug("No resource");
  42                 goto error;
  43         }
  44
  45         addr = ((res->bus_lower - 1) | (size - 1)) + 1;
  46
  47         if (addr - res->bus_start + size > res->size) {
  48                 debug("No room in resource");
  49                 goto error;
  50         }
  51
  52         res->bus_lower = addr + size;
  53
  54         debug("address=0x%llx bus_lower=0x%llx", (unsigned long long)addr,
  55               (unsigned long long)res->bus_lower);
  56
  57         *bar = addr;
  58         return 0;
  59
  60  error:
  61         *bar = (pci_addr_t)-1;
  62         return -1;
  63 }
  64
  65 static void pciauto_show_region(const char *name, struct pci_region *region)
  66 {
  67         pciauto_region_init(region);
  68         debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n"
  69               "\t\tPhysical Memory [%llx-%llxx]\n", name,
  70               (unsigned long long)region->bus_start,
  71               (unsigned long long)(region->bus_start + region->size - 1),
  72               (unsigned long long)region->phys_start,
  73               (unsigned long long)(region->phys_start + region->size - 1));
  74 }
  75
  76 void pciauto_config_init(struct pci_controller *hose)
  77 {
  78         int i;
  79
  80         hose->pci_io = NULL;
  81         hose->pci_mem = NULL;
  82         hose->pci_prefetch = NULL;
  83
  84         for (i = 0; i < hose->region_count; i++) {
  85                 switch (hose->regions[i].flags) {
  86                 case PCI_REGION_IO:
  87                         if (!hose->pci_io ||
  88                             hose->pci_io->size < hose->regions[i].size)
  89                                 hose->pci_io = hose->regions + i;
  90                         break;
  91                 case PCI_REGION_MEM:
  92                         if (!hose->pci_mem ||
  93                             hose->pci_mem->size < hose->regions[i].size)
  94                                 hose->pci_mem = hose->regions + i;
  95                         break;
  96                 case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
  97                         if (!hose->pci_prefetch ||
  98                             hose->pci_prefetch->size < hose->regions[i].size)
  99                                 hose->pci_prefetch = hose->regions + i;
 100                         break;
 101                 }
 102         }
 103
 104
 105         if (hose->pci_mem)
 106                 pciauto_show_region("Memory", hose->pci_mem);
 107         if (hose->pci_prefetch)
 108                 pciauto_show_region("Prefetchable Mem", hose->pci_prefetch);
 109         if (hose->pci_io)
 110                 pciauto_show_region("I/O", hose->pci_io);
 111 }