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537849aa SG |
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 <inttypes.h> | |
12 | #include <pci.h> | |
537849aa SG |
13 | |
14 | DECLARE_GLOBAL_DATA_PTR; | |
15 | ||
16 | static int sandbox_pci_write_config(struct udevice *bus, pci_dev_t devfn, | |
17 | uint offset, ulong value, | |
18 | enum pci_size_t size) | |
19 | { | |
20 | struct dm_pci_emul_ops *ops; | |
21 | struct udevice *emul; | |
22 | int ret; | |
23 | ||
24 | ret = sandbox_pci_get_emul(bus, devfn, &emul); | |
25 | if (ret) | |
26 | return ret == -ENODEV ? 0 : ret; | |
27 | ops = pci_get_emul_ops(emul); | |
28 | if (!ops || !ops->write_config) | |
29 | return -ENOSYS; | |
30 | ||
31 | return ops->write_config(emul, offset, value, size); | |
32 | } | |
33 | ||
34 | static int sandbox_pci_read_config(struct udevice *bus, pci_dev_t devfn, | |
35 | uint offset, ulong *valuep, | |
36 | enum pci_size_t size) | |
37 | { | |
38 | struct dm_pci_emul_ops *ops; | |
39 | struct udevice *emul; | |
40 | int ret; | |
41 | ||
42 | /* Prepare the default response */ | |
43 | *valuep = pci_get_ff(size); | |
44 | ret = sandbox_pci_get_emul(bus, devfn, &emul); | |
45 | if (ret) | |
46 | return ret == -ENODEV ? 0 : ret; | |
47 | ops = pci_get_emul_ops(emul); | |
48 | if (!ops || !ops->read_config) | |
49 | return -ENOSYS; | |
50 | ||
51 | return ops->read_config(emul, offset, valuep, size); | |
52 | } | |
53 | ||
537849aa SG |
54 | static const struct dm_pci_ops sandbox_pci_ops = { |
55 | .read_config = sandbox_pci_read_config, | |
56 | .write_config = sandbox_pci_write_config, | |
57 | }; | |
58 | ||
59 | static const struct udevice_id sandbox_pci_ids[] = { | |
60 | { .compatible = "sandbox,pci" }, | |
61 | { } | |
62 | }; | |
63 | ||
64 | U_BOOT_DRIVER(pci_sandbox) = { | |
65 | .name = "pci_sandbox", | |
66 | .id = UCLASS_PCI, | |
67 | .of_match = sandbox_pci_ids, | |
68 | .ops = &sandbox_pci_ops, | |
91195485 SG |
69 | |
70 | /* Attach an emulator if we can */ | |
71 | .child_post_bind = dm_scan_fdt_dev, | |
537849aa SG |
72 | .per_child_platdata_auto_alloc_size = |
73 | sizeof(struct pci_child_platdata), | |
74 | }; |