pci_auto_common.c 3.0 KB

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  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. #include <common.h>
  14. #include <dm.h>
  15. #include <errno.h>
  16. #include <pci.h>
  17. void pciauto_region_init(struct pci_region *res)
  18. {
  19. /*
  20. * Avoid allocating PCI resources from address 0 -- this is illegal
  21. * according to PCI 2.1 and moreover, this is known to cause Linux IDE
  22. * drivers to fail. Use a reasonable starting value of 0x1000 instead
  23. * if the bus start address is below 0x1000.
  24. */
  25. res->bus_lower = res->bus_start < 0x1000 ? 0x1000 : res->bus_start;
  26. }
  27. void pciauto_region_align(struct pci_region *res, pci_size_t size)
  28. {
  29. res->bus_lower = ((res->bus_lower - 1) | (size - 1)) + 1;
  30. }
  31. int pciauto_region_allocate(struct pci_region *res, pci_size_t size,
  32. pci_addr_t *bar, bool supports_64bit)
  33. {
  34. pci_addr_t addr;
  35. if (!res) {
  36. debug("No resource\n");
  37. goto error;
  38. }
  39. addr = ((res->bus_lower - 1) | (size - 1)) + 1;
  40. if (addr - res->bus_start + size > res->size) {
  41. debug("No room in resource, avail start=%llx / size=%llx, "
  42. "need=%llx\n", (unsigned long long)res->bus_lower,
  43. (unsigned long long)res->size, (unsigned long long)size);
  44. goto error;
  45. }
  46. if (upper_32_bits(addr) && !supports_64bit) {
  47. debug("Cannot assign 64-bit address to 32-bit-only resource\n");
  48. goto error;
  49. }
  50. res->bus_lower = addr + size;
  51. debug("address=0x%llx bus_lower=0x%llx\n", (unsigned long long)addr,
  52. (unsigned long long)res->bus_lower);
  53. *bar = addr;
  54. return 0;
  55. error:
  56. *bar = (pci_addr_t)-1;
  57. return -1;
  58. }
  59. static void pciauto_show_region(const char *name, struct pci_region *region)
  60. {
  61. pciauto_region_init(region);
  62. debug("PCI Autoconfig: Bus %s region: [%llx-%llx],\n"
  63. "\t\tPhysical Memory [%llx-%llxx]\n", name,
  64. (unsigned long long)region->bus_start,
  65. (unsigned long long)(region->bus_start + region->size - 1),
  66. (unsigned long long)region->phys_start,
  67. (unsigned long long)(region->phys_start + region->size - 1));
  68. }
  69. void pciauto_config_init(struct pci_controller *hose)
  70. {
  71. int i;
  72. hose->pci_io = NULL;
  73. hose->pci_mem = NULL;
  74. hose->pci_prefetch = NULL;
  75. for (i = 0; i < hose->region_count; i++) {
  76. switch (hose->regions[i].flags) {
  77. case PCI_REGION_IO:
  78. if (!hose->pci_io ||
  79. hose->pci_io->size < hose->regions[i].size)
  80. hose->pci_io = hose->regions + i;
  81. break;
  82. case PCI_REGION_MEM:
  83. if (!hose->pci_mem ||
  84. hose->pci_mem->size < hose->regions[i].size)
  85. hose->pci_mem = hose->regions + i;
  86. break;
  87. case (PCI_REGION_MEM | PCI_REGION_PREFETCH):
  88. if (!hose->pci_prefetch ||
  89. hose->pci_prefetch->size < hose->regions[i].size)
  90. hose->pci_prefetch = hose->regions + i;
  91. break;
  92. }
  93. }
  94. if (hose->pci_mem)
  95. pciauto_show_region("Memory", hose->pci_mem);
  96. if (hose->pci_prefetch)
  97. pciauto_show_region("Prefetchable Mem", hose->pci_prefetch);
  98. if (hose->pci_io)
  99. pciauto_show_region("I/O", hose->pci_io);
  100. }