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