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[u-boot] / drivers / pci / pci-emul-uclass.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2014 Google, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <fdtdec.h>
10 #include <linux/libfdt.h>
11 #include <pci.h>
12 #include <dm/lists.h>
13
14 struct sandbox_pci_priv {
15         int dev_count;
16 };
17
18 int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
19                          struct udevice **emulp)
20 {
21         struct udevice *dev;
22         int ret;
23
24         ret = pci_bus_find_devfn(bus, find_devfn, &dev);
25         if (ret) {
26                 debug("%s: Could not find emulator for dev %x\n", __func__,
27                       find_devfn);
28                 return ret;
29         }
30
31         ret = device_find_first_child(dev, emulp);
32         if (ret)
33                 return ret;
34
35         return *emulp ? 0 : -ENODEV;
36 }
37
38 static int sandbox_pci_emul_post_probe(struct udevice *dev)
39 {
40         struct sandbox_pci_priv *priv = dev->uclass->priv;
41
42         priv->dev_count++;
43         sandbox_set_enable_pci_map(true);
44
45         return 0;
46 }
47
48 static int sandbox_pci_emul_pre_remove(struct udevice *dev)
49 {
50         struct sandbox_pci_priv *priv = dev->uclass->priv;
51
52         priv->dev_count--;
53         sandbox_set_enable_pci_map(priv->dev_count > 0);
54
55         return 0;
56 }
57
58 UCLASS_DRIVER(pci_emul) = {
59         .id             = UCLASS_PCI_EMUL,
60         .name           = "pci_emul",
61         .post_probe     = sandbox_pci_emul_post_probe,
62         .pre_remove     = sandbox_pci_emul_pre_remove,
63         .priv_auto_alloc_size   = sizeof(struct sandbox_pci_priv),
64 };