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
27int
28bit_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}
50