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[u-boot] / drivers / pci / pci-emul-uclass.c
1 /*
2  * Copyright (c) 2014 Google, Inc
3  * Written by Simon Glass <sjg@chromium.org>
4  *
5  * SPDX-License-Identifier:     GPL-2.0+
6  */
7
8 #include <common.h>
9 #include <dm.h>
10 #include <fdtdec.h>
11 #include <linux/libfdt.h>
12 #include <pci.h>
13 #include <dm/lists.h>
14
15 DECLARE_GLOBAL_DATA_PTR;
16
17 struct sandbox_pci_priv {
18         int dev_count;
19 };
20
21 int sandbox_pci_get_emul(struct udevice *bus, pci_dev_t find_devfn,
22                          struct udevice **emulp)
23 {
24         struct udevice *dev;
25         int ret;
26
27         ret = pci_bus_find_devfn(bus, find_devfn, &dev);
28         if (ret) {
29                 debug("%s: Could not find emulator for dev %x\n", __func__,
30                       find_devfn);
31                 return ret;
32         }
33
34         ret = device_find_first_child(dev, emulp);
35         if (ret)
36                 return ret;
37
38         return *emulp ? 0 : -ENODEV;
39 }
40
41 static int sandbox_pci_emul_post_probe(struct udevice *dev)
42 {
43         struct sandbox_pci_priv *priv = dev->uclass->priv;
44
45         priv->dev_count++;
46         sandbox_set_enable_pci_map(true);
47
48         return 0;
49 }
50
51 static int sandbox_pci_emul_pre_remove(struct udevice *dev)
52 {
53         struct sandbox_pci_priv *priv = dev->uclass->priv;
54
55         priv->dev_count--;
56         sandbox_set_enable_pci_map(priv->dev_count > 0);
57
58         return 0;
59 }
60
61 UCLASS_DRIVER(pci_emul) = {
62         .id             = UCLASS_PCI_EMUL,
63         .name           = "pci_emul",
64         .post_probe     = sandbox_pci_emul_post_probe,
65         .pre_remove     = sandbox_pci_emul_pre_remove,
66         .priv_auto_alloc_size   = sizeof(struct sandbox_pci_priv),
67 };