pci-emul-uclass.c 2.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (c) 2014 Google, Inc
  4. * Written by Simon Glass <sjg@chromium.org>
  5. */
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <fdtdec.h>
  9. #include <log.h>
  10. #include <linux/libfdt.h>
  11. #include <pci.h>
  12. #include <dm/lists.h>
  13. struct sandbox_pci_emul_priv {
  14. int dev_count;
  15. };
  16. int sandbox_pci_get_emul(const struct udevice *bus, pci_dev_t find_devfn,
  17. struct udevice **containerp, struct udevice **emulp)
  18. {
  19. struct pci_emul_uc_priv *upriv;
  20. struct udevice *dev;
  21. int ret;
  22. *containerp = NULL;
  23. ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(find_devfn), &dev);
  24. if (ret) {
  25. debug("%s: Could not find emulator for dev %x\n", __func__,
  26. find_devfn);
  27. return ret;
  28. }
  29. *containerp = dev;
  30. ret = uclass_get_device_by_phandle(UCLASS_PCI_EMUL, dev, "sandbox,emul",
  31. emulp);
  32. if (!ret) {
  33. upriv = dev_get_uclass_priv(*emulp);
  34. upriv->client = dev;
  35. } else if (device_get_uclass_id(dev) != UCLASS_PCI_GENERIC) {
  36. /*
  37. * See commit 4345998ae9df,
  38. * "pci: sandbox: Support dynamically binding device driver"
  39. */
  40. *emulp = dev;
  41. }
  42. return 0;
  43. }
  44. int sandbox_pci_get_client(struct udevice *emul, struct udevice **devp)
  45. {
  46. struct pci_emul_uc_priv *upriv = dev_get_uclass_priv(emul);
  47. if (!upriv->client)
  48. return -ENOENT;
  49. *devp = upriv->client;
  50. return 0;
  51. }
  52. uint sandbox_pci_read_bar(u32 barval, int type, uint size)
  53. {
  54. u32 result;
  55. result = barval;
  56. if (result == 0xffffffff) {
  57. if (type == PCI_BASE_ADDRESS_SPACE_IO) {
  58. result = (~(size - 1) &
  59. PCI_BASE_ADDRESS_IO_MASK) |
  60. PCI_BASE_ADDRESS_SPACE_IO;
  61. } else {
  62. result = (~(size - 1) &
  63. PCI_BASE_ADDRESS_MEM_MASK) |
  64. PCI_BASE_ADDRESS_MEM_TYPE_32;
  65. }
  66. }
  67. return result;
  68. }
  69. static int sandbox_pci_emul_post_probe(struct udevice *dev)
  70. {
  71. struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
  72. priv->dev_count++;
  73. sandbox_set_enable_pci_map(true);
  74. return 0;
  75. }
  76. static int sandbox_pci_emul_pre_remove(struct udevice *dev)
  77. {
  78. struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
  79. priv->dev_count--;
  80. sandbox_set_enable_pci_map(priv->dev_count > 0);
  81. return 0;
  82. }
  83. UCLASS_DRIVER(pci_emul) = {
  84. .id = UCLASS_PCI_EMUL,
  85. .name = "pci_emul",
  86. .post_probe = sandbox_pci_emul_post_probe,
  87. .pre_remove = sandbox_pci_emul_pre_remove,
  88. .priv_auto_alloc_size = sizeof(struct sandbox_pci_emul_priv),
  89. .per_device_auto_alloc_size = sizeof(struct pci_emul_uc_priv),
  90. };
  91. /*
  92. * This uclass is a child of the pci bus. Its platdata is not defined here so
  93. * is defined by its parent, UCLASS_PCI, which uses struct pci_child_platdata.
  94. * See per_child_platdata_auto_alloc_size in UCLASS_DRIVER(pci).
  95. */
  96. UCLASS_DRIVER(pci_emul_parent) = {
  97. .id = UCLASS_PCI_EMUL_PARENT,
  98. .name = "pci_emul_parent",
  99. .post_bind = dm_scan_fdt_dev,
  100. };
  101. static const struct udevice_id pci_emul_parent_ids[] = {
  102. { .compatible = "sandbox,pci-emul-parent" },
  103. { }
  104. };
  105. U_BOOT_DRIVER(pci_emul_parent_drv) = {
  106. .name = "pci_emul_parent_drv",
  107. .id = UCLASS_PCI_EMUL_PARENT,
  108. .of_match = pci_emul_parent_ids,
  109. };