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 "ram.h"
26
27 struct ramxlat {
28 int id;
29 u8 enc;
30 };
31
32 static inline int
ramxlat(const struct ramxlat * xlat,int id)33 ramxlat(const struct ramxlat *xlat, int id)
34 {
35 while (xlat->id >= 0) {
36 if (xlat->id == id)
37 return xlat->enc;
38 xlat++;
39 }
40 return -EINVAL;
41 }
42
43 static const struct ramxlat
44 ramgddr3_cl_lo[] = {
45 { 5, 5 }, { 7, 7 }, { 8, 0 }, { 9, 1 }, { 10, 2 }, { 11, 3 }, { 12, 8 },
46 /* the below are mentioned in some, but not all, gddr3 docs */
47 { 13, 9 }, { 14, 6 },
48 /* XXX: Per Samsung docs, are these used? They overlap with Qimonda */
49 /* { 4, 4 }, { 5, 5 }, { 6, 6 }, { 12, 8 }, { 13, 9 }, { 14, 10 },
50 * { 15, 11 }, */
51 { -1 }
52 };
53
54 static const struct ramxlat
55 ramgddr3_cl_hi[] = {
56 { 10, 2 }, { 11, 3 }, { 12, 4 }, { 13, 5 }, { 14, 6 }, { 15, 7 },
57 { 16, 0 }, { 17, 1 },
58 { -1 }
59 };
60
61 static const struct ramxlat
62 ramgddr3_wr_lo[] = {
63 { 5, 2 }, { 7, 4 }, { 8, 5 }, { 9, 6 }, { 10, 7 },
64 { 11, 0 }, { 13 , 1 },
65 /* the below are mentioned in some, but not all, gddr3 docs */
66 { 4, 0 }, { 6, 3 }, { 12, 1 },
67 { -1 }
68 };
69
70 int
nvkm_gddr3_calc(struct nvkm_ram * ram)71 nvkm_gddr3_calc(struct nvkm_ram *ram)
72 {
73 int CL, WR, CWL, DLL = 0, ODT = 0, RON, hi;
74
75 switch (ram->next->bios.timing_ver) {
76 case 0x10:
77 CWL = ram->next->bios.timing_10_CWL;
78 CL = ram->next->bios.timing_10_CL;
79 WR = ram->next->bios.timing_10_WR;
80 DLL = !ram->next->bios.ramcfg_DLLoff;
81 ODT = ram->next->bios.timing_10_ODT;
82 RON = ram->next->bios.ramcfg_RON;
83 break;
84 case 0x20:
85 CWL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
86 CL = (ram->next->bios.timing[1] & 0x0000001f) >> 0;
87 WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
88 /* XXX: Get these values from the VBIOS instead */
89 DLL = !(ram->mr[1] & 0x1);
90 RON = !((ram->mr[1] & 0x300) >> 8);
91 break;
92 default:
93 return -ENOSYS;
94 }
95
96 if (ram->next->bios.timing_ver == 0x20 ||
97 ram->next->bios.ramcfg_timing == 0xff) {
98 ODT = (ram->mr[1] & 0xc) >> 2;
99 }
100
101 hi = ram->mr[2] & 0x1;
102 CL = ramxlat(hi ? ramgddr3_cl_hi : ramgddr3_cl_lo, CL);
103 WR = ramxlat(ramgddr3_wr_lo, WR);
104 if (CL < 0 || CWL < 1 || CWL > 7 || WR < 0)
105 return -EINVAL;
106
107 ram->mr[0] &= ~0xf74;
108 ram->mr[0] |= (CWL & 0x07) << 9;
109 ram->mr[0] |= (CL & 0x07) << 4;
110 ram->mr[0] |= (CL & 0x08) >> 1;
111
112 ram->mr[1] &= ~0x3fc;
113 ram->mr[1] |= (ODT & 0x03) << 2;
114 ram->mr[1] |= (RON & 0x03) << 8;
115 ram->mr[1] |= (WR & 0x03) << 4;
116 ram->mr[1] |= (WR & 0x04) << 5;
117 ram->mr[1] |= !DLL << 6;
118 return 0;
119 }
120