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 | |
34 | static u8 |
35 | nvbios_ramcfg_strap(struct nouveau_subdev *subdev) |
36 | { |
37 | return (nv_rd32(subdev, 0x101000) & 0x0000003c) >> 2; |
38 | } |
39 | |
40 | u8 |
41 | nvbios_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 | |
55 | u8 |
56 | nvbios_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 | |