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
27struct ramxlat {
28	int id;
29	u8 enc;
30};
31
32static inline int
33ramxlat(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
43static const struct ramxlat
44ramgddr3_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
54static const struct ramxlat
55ramgddr3_cl_hi[] = {
56	{ 10, 2 }, { 11, 3 }, { 12, 4 }, { 13, 5 }, { 14, 6 }, { 15, 7 },
57	{ 16, 0 }, { 17, 1 },
58	{ -1 }
59};
60
61static const struct ramxlat
62ramgddr3_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
70int
71nvkm_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