Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.9 / 245dcfe96f6900dbf64e48a350badf4c90fabc2e / . / drivers / gpu / drm / nouveau / nvkm / subdev / bios / ramcfg.c
blob: 1623c8dfe797362042efddb17bb1e827e13cd6b7 [file] [log] [blame]
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]1/*
2 * Copyright 2013 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 <bskeggs@redhat.com>
23 */
24
25#include <subdev/bios.h>
26#include <subdev/bios/bit.h>
27#include <subdev/bios/ramcfg.h>
Ben Skeggs15606cb2014-11-04 15:13:30 +1000[diff] [blame]28#include <subdev/bios/M0203.h>
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]29
30static u8
Ben Skeggs0a8649f2014-03-19 00:55:02 +1000[diff] [blame]31nvbios_ramcfg_strap(struct nouveau_subdev *subdev)
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]32{
Ben Skeggs0a8649f2014-03-19 00:55:02 +1000[diff] [blame]33 return (nv_rd32(subdev, 0x101000) & 0x0000003c) >> 2;
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]34}
35
36u8
37nvbios_ramcfg_count(struct nouveau_bios *bios)
38{
39 struct bit_entry bit_M;
40
41 if (!bit_entry(bios, 'M', &bit_M)) {
42 if (bit_M.version == 1 && bit_M.length >= 5)
43 return nv_ro08(bios, bit_M.offset + 2);
44 if (bit_M.version == 2 && bit_M.length >= 3)
45 return nv_ro08(bios, bit_M.offset + 0);
46 }
47
48 return 0x00;
49}
50
51u8
Ben Skeggs0a8649f2014-03-19 00:55:02 +1000[diff] [blame]52nvbios_ramcfg_index(struct nouveau_subdev *subdev)
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]53{
Ben Skeggs0a8649f2014-03-19 00:55:02 +1000[diff] [blame]54 struct nouveau_bios *bios = nouveau_bios(subdev);
55 u8 strap = nvbios_ramcfg_strap(subdev);
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]56 u32 xlat = 0x00000000;
57 struct bit_entry bit_M;
Ben Skeggs15606cb2014-11-04 15:13:30 +1000[diff] [blame]58 struct nvbios_M0203E M0203E;
59 u8 ver, hdr;
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]60
61 if (!bit_entry(bios, 'M', &bit_M)) {
62 if (bit_M.version == 1 && bit_M.length >= 5)
63 xlat = nv_ro16(bios, bit_M.offset + 3);
Ben Skeggs15606cb2014-11-04 15:13:30 +1000[diff] [blame]64 if (bit_M.version == 2 && bit_M.length >= 3) {
65 /*XXX: is M ever shorter than this?
66 * if not - what is xlat used for now?
67 * also - sigh..
68 */
69 if (bit_M.length >= 7 &&
70 nvbios_M0203Em(bios, strap, &ver, &hdr, &M0203E))
71 return M0203E.group;
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]72 xlat = nv_ro16(bios, bit_M.offset + 1);
Ben Skeggs15606cb2014-11-04 15:13:30 +1000[diff] [blame]73 }
Ben Skeggs0a0dc8f2013-11-27 11:28:19 +1000[diff] [blame]74 }
75
76 if (xlat)
77 strap = nv_ro08(bios, xlat + strap);
78 return strap;
79}