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 * Roy Spliet <rspliet@eclipso.eu>
24 */
25 #include "priv.h"
26 #include "ram.h"
27
28 struct ramxlat {
29 int id;
30 u8 enc;
31 };
32
33 static inline int
ramxlat(const struct ramxlat * xlat,int id)34 ramxlat(const struct ramxlat *xlat, int id)
35 {
36 while (xlat->id >= 0) {
37 if (xlat->id == id)
38 return xlat->enc;
39 xlat++;
40 }
41 return -EINVAL;
42 }
43
44 static const struct ramxlat
45 ramddr3_cl[] = {
46 { 5, 2 }, { 6, 4 }, { 7, 6 }, { 8, 8 }, { 9, 10 }, { 10, 12 },
47 { 11, 14 },
48 /* the below are mentioned in some, but not all, ddr3 docs */
49 { 12, 1 }, { 13, 3 }, { 14, 5 },
50 { -1 }
51 };
52
53 static const struct ramxlat
54 ramddr3_wr[] = {
55 { 5, 1 }, { 6, 2 }, { 7, 3 }, { 8, 4 }, { 10, 5 }, { 12, 6 },
56 /* the below are mentioned in some, but not all, ddr3 docs */
57 { 14, 7 }, { 15, 7 }, { 16, 0 },
58 { -1 }
59 };
60
61 static const struct ramxlat
62 ramddr3_cwl[] = {
63 { 5, 0 }, { 6, 1 }, { 7, 2 }, { 8, 3 },
64 /* the below are mentioned in some, but not all, ddr3 docs */
65 { 9, 4 }, { 10, 5 },
66 { -1 }
67 };
68
69 int
nvkm_sddr3_calc(struct nvkm_ram * ram)70 nvkm_sddr3_calc(struct nvkm_ram *ram)
71 {
72 int CWL, CL, WR, DLL = 0, ODT = 0;
73
74 DLL = !ram->next->bios.ramcfg_DLLoff;
75
76 switch (ram->next->bios.timing_ver) {
77 case 0x10:
78 if (ram->next->bios.timing_hdr < 0x17) {
79 /* XXX: NV50: Get CWL from the timing register */
80 return -ENOSYS;
81 }
82 CWL = ram->next->bios.timing_10_CWL;
83 CL = ram->next->bios.timing_10_CL;
84 WR = ram->next->bios.timing_10_WR;
85 ODT = ram->next->bios.timing_10_ODT;
86 break;
87 case 0x20:
88 CWL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
89 CL = (ram->next->bios.timing[1] & 0x0000001f) >> 0;
90 WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
91 /* XXX: Get these values from the VBIOS instead */
92 ODT = (ram->mr[1] & 0x004) >> 2 |
93 (ram->mr[1] & 0x040) >> 5 |
94 (ram->mr[1] & 0x200) >> 7;
95 break;
96 default:
97 return -ENOSYS;
98 }
99
100 CWL = ramxlat(ramddr3_cwl, CWL);
101 CL = ramxlat(ramddr3_cl, CL);
102 WR = ramxlat(ramddr3_wr, WR);
103 if (CL < 0 || CWL < 0 || WR < 0)
104 return -EINVAL;
105
106 ram->mr[0] &= ~0xf74;
107 ram->mr[0] |= (WR & 0x07) << 9;
108 ram->mr[0] |= (CL & 0x0e) << 3;
109 ram->mr[0] |= (CL & 0x01) << 2;
110
111 ram->mr[1] &= ~0x245;
112 ram->mr[1] |= (ODT & 0x1) << 2;
113 ram->mr[1] |= (ODT & 0x2) << 5;
114 ram->mr[1] |= (ODT & 0x4) << 7;
115 ram->mr[1] |= !DLL;
116
117 ram->mr[2] &= ~0x038;
118 ram->mr[2] |= (CWL & 0x07) << 3;
119 return 0;
120 }
121