1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2014 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
10 #include <linux/libfdt.h>
14 struct sandbox_pci_emul_priv {
18 int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
19 struct udevice **containerp, struct udevice **emulp)
25 ret = pci_bus_find_devfn(bus, PCI_MASK_BUS(find_devfn), &dev);
27 debug("%s: Could not find emulator for dev %x\n", __func__,
34 * See commit 4345998ae9df,
35 * "pci: sandbox: Support dynamically binding device driver"
37 ret = uclass_get_device_by_phandle(UCLASS_PCI_EMUL, dev, "sandbox,emul",
39 if (ret && device_get_uclass_id(dev) != UCLASS_PCI_GENERIC)
42 return *emulp ? 0 : -ENODEV;
45 uint sandbox_pci_read_bar(u32 barval, int type, uint size)
50 if (result == 0xffffffff) {
51 if (type == PCI_BASE_ADDRESS_SPACE_IO) {
52 result = (~(size - 1) &
53 PCI_BASE_ADDRESS_IO_MASK) |
54 PCI_BASE_ADDRESS_SPACE_IO;
56 result = (~(size - 1) &
57 PCI_BASE_ADDRESS_MEM_MASK) |
58 PCI_BASE_ADDRESS_MEM_TYPE_32;
65 static int sandbox_pci_emul_post_probe(struct udevice *dev)
67 struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
70 sandbox_set_enable_pci_map(true);
75 static int sandbox_pci_emul_pre_remove(struct udevice *dev)
77 struct sandbox_pci_emul_priv *priv = dev->uclass->priv;
80 sandbox_set_enable_pci_map(priv->dev_count > 0);
85 UCLASS_DRIVER(pci_emul) = {
86 .id = UCLASS_PCI_EMUL,
88 .post_probe = sandbox_pci_emul_post_probe,
89 .pre_remove = sandbox_pci_emul_pre_remove,
90 .priv_auto_alloc_size = sizeof(struct sandbox_pci_emul_priv),
94 * This uclass is a child of the pci bus. Its platdata is not defined here so
95 * is defined by its parent, UCLASS_PCI, which uses struct pci_child_platdata.
96 * See per_child_platdata_auto_alloc_size in UCLASS_DRIVER(pci).
98 UCLASS_DRIVER(pci_emul_parent) = {
99 .id = UCLASS_PCI_EMUL_PARENT,
100 .name = "pci_emul_parent",
101 .post_bind = dm_scan_fdt_dev,
104 static const struct udevice_id pci_emul_parent_ids[] = {
105 { .compatible = "sandbox,pci-emul-parent" },
109 U_BOOT_DRIVER(pci_emul_parent_drv) = {
110 .name = "pci_emul_parent_drv",
111 .id = UCLASS_PCI_EMUL_PARENT,
112 .of_match = pci_emul_parent_ids,