1 /*
2 * Copyright 2012 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs
23 */
24 #include <subdev/bios.h>
25 #include <subdev/bios/bit.h>
26
27 int
28 bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit)
29 {
30 if (likely(bios->bit_offset)) {
31 u8 entries = nvbios_rd08(bios, bios->bit_offset + 10);
32 u32 entry = bios->bit_offset + 12;
33 while (entries--) {
34 if (nvbios_rd08(bios, entry + 0) == id) {
35 bit->id = nvbios_rd08(bios, entry + 0);
36 bit->version = nvbios_rd08(bios, entry + 1);
37 bit->length = nvbios_rd16(bios, entry + 2);
38 bit->offset = nvbios_rd16(bios, entry + 4);
39 return 0;
40 }
41
42 entry += nvbios_rd08(bios, bios->bit_offset + 9);
43 }
44
45 return -ENOENT;
46 }
47
48 return -EINVAL;
49 }