1 /* $NetBSD: nouveau_nvkm_subdev_fb_sddr3.c,v 1.4 2021/12/18 23:45:39 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 * Roy Spliet <rspliet@eclipso.eu>
26 */
27 #include <sys/cdefs.h>
28 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_fb_sddr3.c,v 1.4 2021/12/18 23:45:39 riastradh Exp $");
29
30 #include "ram.h"
31 #include "priv.h"
32 #include "ram.h"
33
34 struct ramxlat {
35 int id;
36 u8 enc;
37 };
38
39 static inline int
ramxlat(const struct ramxlat * xlat,int id)40 ramxlat(const struct ramxlat *xlat, int id)
41 {
42 while (xlat->id >= 0) {
43 if (xlat->id == id)
44 return xlat->enc;
45 xlat++;
46 }
47 return -EINVAL;
48 }
49
50 static const struct ramxlat
51 ramddr3_cl[] = {
52 { 5, 2 }, { 6, 4 }, { 7, 6 }, { 8, 8 }, { 9, 10 }, { 10, 12 },
53 { 11, 14 },
54 /* the below are mentioned in some, but not all, ddr3 docs */
55 { 12, 1 }, { 13, 3 }, { 14, 5 },
56 { -1 }
57 };
58
59 static const struct ramxlat
60 ramddr3_wr[] = {
61 { 5, 1 }, { 6, 2 }, { 7, 3 }, { 8, 4 }, { 10, 5 }, { 12, 6 },
62 /* the below are mentioned in some, but not all, ddr3 docs */
63 { 14, 7 }, { 15, 7 }, { 16, 0 },
64 { -1 }
65 };
66
67 static const struct ramxlat
68 ramddr3_cwl[] = {
69 { 5, 0 }, { 6, 1 }, { 7, 2 }, { 8, 3 },
70 /* the below are mentioned in some, but not all, ddr3 docs */
71 { 9, 4 }, { 10, 5 },
72 { -1 }
73 };
74
75 int
nvkm_sddr3_calc(struct nvkm_ram * ram)76 nvkm_sddr3_calc(struct nvkm_ram *ram)
77 {
78 int CWL, CL, WR, DLL = 0, ODT = 0;
79
80 DLL = !ram->next->bios.ramcfg_DLLoff;
81
82 switch (ram->next->bios.timing_ver) {
83 case 0x10:
84 if (ram->next->bios.timing_hdr < 0x17) {
85 /* XXX: NV50: Get CWL from the timing register */
86 return -ENOSYS;
87 }
88 CWL = ram->next->bios.timing_10_CWL;
89 CL = ram->next->bios.timing_10_CL;
90 WR = ram->next->bios.timing_10_WR;
91 ODT = ram->next->bios.timing_10_ODT;
92 break;
93 case 0x20:
94 CWL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
95 CL = (ram->next->bios.timing[1] & 0x0000001f) >> 0;
96 WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
97 /* XXX: Get these values from the VBIOS instead */
98 ODT = (ram->mr[1] & 0x004) >> 2 |
99 (ram->mr[1] & 0x040) >> 5 |
100 (ram->mr[1] & 0x200) >> 7;
101 break;
102 default:
103 return -ENOSYS;
104 }
105
106 CWL = ramxlat(ramddr3_cwl, CWL);
107 CL = ramxlat(ramddr3_cl, CL);
108 WR = ramxlat(ramddr3_wr, WR);
109 if (CL < 0 || CWL < 0 || WR < 0)
110 return -EINVAL;
111
112 ram->mr[0] &= ~0xf74;
113 ram->mr[0] |= (WR & 0x07) << 9;
114 ram->mr[0] |= (CL & 0x0e) << 3;
115 ram->mr[0] |= (CL & 0x01) << 2;
116
117 ram->mr[1] &= ~0x245;
118 ram->mr[1] |= (ODT & 0x1) << 2;
119 ram->mr[1] |= (ODT & 0x2) << 5;
120 ram->mr[1] |= (ODT & 0x4) << 7;
121 ram->mr[1] |= !DLL;
122
123 ram->mr[2] &= ~0x038;
124 ram->mr[2] |= (CWL & 0x07) << 3;
125 return 0;
126 }
127