1/* $NetBSD: nouveau_subdev_bios_ramcfg.c,v 1.1.1.1 2014/08/06 12:36:29 riastradh Exp $ */
2
3/*
4 * Copyright 2013 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 <bskeggs@redhat.com>
25 */
26
27#include <sys/cdefs.h>
28__KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_bios_ramcfg.c,v 1.1.1.1 2014/08/06 12:36:29 riastradh Exp $");
29
30#include <subdev/bios.h>
31#include <subdev/bios/bit.h>
32#include <subdev/bios/ramcfg.h>
33
34static u8
35nvbios_ramcfg_strap(struct nouveau_subdev *subdev)
36{
37 return (nv_rd32(subdev, 0x101000) & 0x0000003c) >> 2;
38}
39
40u8
41nvbios_ramcfg_count(struct nouveau_bios *bios)
42{
43 struct bit_entry bit_M;
44
45 if (!bit_entry(bios, 'M', &bit_M)) {
46 if (bit_M.version == 1 && bit_M.length >= 5)
47 return nv_ro08(bios, bit_M.offset + 2);
48 if (bit_M.version == 2 && bit_M.length >= 3)
49 return nv_ro08(bios, bit_M.offset + 0);
50 }
51
52 return 0x00;
53}
54
55u8
56nvbios_ramcfg_index(struct nouveau_subdev *subdev)
57{
58 struct nouveau_bios *bios = nouveau_bios(subdev);
59 u8 strap = nvbios_ramcfg_strap(subdev);
60 u32 xlat = 0x00000000;
61 struct bit_entry bit_M;
62
63 if (!bit_entry(bios, 'M', &bit_M)) {
64 if (bit_M.version == 1 && bit_M.length >= 5)
65 xlat = nv_ro16(bios, bit_M.offset + 3);
66 if (bit_M.version == 2 && bit_M.length >= 3)
67 xlat = nv_ro16(bios, bit_M.offset + 1);
68 }
69
70 if (xlat)
71 strap = nv_ro08(bios, xlat + strap);
72 return strap;
73}
74