1 | /* $NetBSD: nouveau_subdev_fb_sddr3.c,v 1.1.1.1 2014/08/06 12:36:30 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_fb_sddr3.c,v 1.1.1.1 2014/08/06 12:36:30 riastradh Exp $" ); |
29 | |
30 | #include <subdev/bios.h> |
31 | #include "priv.h" |
32 | |
33 | struct ramxlat { |
34 | int id; |
35 | u8 enc; |
36 | }; |
37 | |
38 | static inline int |
39 | ramxlat(const struct ramxlat *xlat, int id) |
40 | { |
41 | while (xlat->id >= 0) { |
42 | if (xlat->id == id) |
43 | return xlat->enc; |
44 | xlat++; |
45 | } |
46 | return -EINVAL; |
47 | } |
48 | |
49 | static const struct ramxlat |
50 | ramddr3_cl[] = { |
51 | { 5, 2 }, { 6, 4 }, { 7, 6 }, { 8, 8 }, { 9, 10 }, { 10, 12 }, |
52 | { 11, 14 }, |
53 | /* the below are mentioned in some, but not all, ddr3 docs */ |
54 | { 12, 1 }, { 13, 3 }, { 14, 5 }, |
55 | { -1 } |
56 | }; |
57 | |
58 | static const struct ramxlat |
59 | ramddr3_wr[] = { |
60 | { 5, 1 }, { 6, 2 }, { 7, 3 }, { 8, 4 }, { 10, 5 }, { 12, 6 }, |
61 | /* the below are mentioned in some, but not all, ddr3 docs */ |
62 | { 14, 7 }, { 16, 0 }, |
63 | { -1 } |
64 | }; |
65 | |
66 | static const struct ramxlat |
67 | ramddr3_cwl[] = { |
68 | { 5, 0 }, { 6, 1 }, { 7, 2 }, { 8, 3 }, |
69 | /* the below are mentioned in some, but not all, ddr3 docs */ |
70 | { 9, 4 }, |
71 | { -1 } |
72 | }; |
73 | |
74 | int |
75 | nouveau_sddr3_calc(struct nouveau_ram *ram) |
76 | { |
77 | struct nouveau_bios *bios = nouveau_bios(ram); |
78 | int WL, CL, WR; |
79 | |
80 | switch (!!ram->timing.data * ram->timing.version) { |
81 | case 0x20: |
82 | WL = (nv_ro16(bios, ram->timing.data + 0x04) & 0x0f80) >> 7; |
83 | CL = nv_ro08(bios, ram->timing.data + 0x04) & 0x1f; |
84 | WR = nv_ro08(bios, ram->timing.data + 0x0a) & 0x7f; |
85 | break; |
86 | default: |
87 | return -ENOSYS; |
88 | } |
89 | |
90 | WL = ramxlat(ramddr3_cwl, WL); |
91 | CL = ramxlat(ramddr3_cl, CL); |
92 | WR = ramxlat(ramddr3_wr, WR); |
93 | if (WL < 0 || CL < 0 || WR < 0) |
94 | return -EINVAL; |
95 | |
96 | ram->mr[0] &= ~0xe74; |
97 | ram->mr[0] |= (WR & 0x07) << 9; |
98 | ram->mr[0] |= (CL & 0x0e) << 3; |
99 | ram->mr[0] |= (CL & 0x01) << 2; |
100 | |
101 | ram->mr[2] &= ~0x038; |
102 | ram->mr[2] |= (WL & 0x07) << 3; |
103 | return 0; |
104 | } |
105 | |