1/*	$NetBSD: nouveau_nvkm_subdev_bios_bit.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
2
3/*
4 * Copyright 2012 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 * Authors: Ben Skeggs
25 */
26#include <sys/cdefs.h>
27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_bit.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28
29#include <subdev/bios.h>
30#include <subdev/bios/bit.h>
31
32int
33bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit)
34{
35	if (likely(bios->bit_offset)) {
36		u8  entries = nvbios_rd08(bios, bios->bit_offset + 10);
37		u32 entry   = bios->bit_offset + 12;
38		while (entries--) {
39			if (nvbios_rd08(bios, entry + 0) == id) {
40				bit->id      = nvbios_rd08(bios, entry + 0);
41				bit->version = nvbios_rd08(bios, entry + 1);
42				bit->length  = nvbios_rd16(bios, entry + 2);
43				bit->offset  = nvbios_rd16(bios, entry + 4);
44				return 0;
45			}
46
47			entry += nvbios_rd08(bios, bios->bit_offset + 9);
48		}
49
50		return -ENOENT;
51	}
52
53	return -EINVAL;
54}
55