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  */
24 #include "ram.h"
25 
26 /* binary driver only executes this path if the condition (a) is true
27  * for any configuration (combination of rammap+ramcfg+timing) that
28  * can be reached on a given card.  for now, we will execute the branch
29  * unconditionally in the hope that a "false everywhere" in the bios
30  * tables doesn't actually mean "don't touch this".
31  */
32 #define NOTE00(a) 1
33 
34 int
nvkm_gddr5_calc(struct nvkm_ram * ram,bool nuts)35 nvkm_gddr5_calc(struct nvkm_ram *ram, bool nuts)
36 {
37 	int pd, lf, xd, vh, vr, vo, l3;
38 	int WL, CL, WR, at[2], dt, ds;
39 	int rq = ram->freq < 1000000; /* XXX */
40 
41 	xd = !ram->next->bios.ramcfg_DLLoff;
42 
43 	switch (ram->next->bios.ramcfg_ver) {
44 	case 0x11:
45 		pd =  ram->next->bios.ramcfg_11_01_80;
46 		lf =  ram->next->bios.ramcfg_11_01_40;
47 		vh =  ram->next->bios.ramcfg_11_02_10;
48 		vr =  ram->next->bios.ramcfg_11_02_04;
49 		vo =  ram->next->bios.ramcfg_11_06;
50 		l3 = !ram->next->bios.ramcfg_11_07_02;
51 		break;
52 	default:
53 		return -ENOSYS;
54 	}
55 
56 	switch (ram->next->bios.timing_ver) {
57 	case 0x20:
58 		WL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
59 		CL = (ram->next->bios.timing[1] & 0x0000001f);
60 		WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
61 		at[0] = ram->next->bios.timing_20_2e_c0;
62 		at[1] = ram->next->bios.timing_20_2e_30;
63 		dt =  ram->next->bios.timing_20_2e_03;
64 		ds =  ram->next->bios.timing_20_2f_03;
65 		break;
66 	default:
67 		return -ENOSYS;
68 	}
69 
70 	if (WL < 1 || WL > 7 || CL < 5 || CL > 36 || WR < 4 || WR > 35)
71 		return -EINVAL;
72 	CL -= 5;
73 	WR -= 4;
74 
75 	ram->mr[0] &= ~0xf7f;
76 	ram->mr[0] |= (WR & 0x0f) << 8;
77 	ram->mr[0] |= (CL & 0x0f) << 3;
78 	ram->mr[0] |= (WL & 0x07) << 0;
79 
80 	ram->mr[1] &= ~0x0bf;
81 	ram->mr[1] |= (xd & 0x01) << 7;
82 	ram->mr[1] |= (at[0] & 0x03) << 4;
83 	ram->mr[1] |= (dt & 0x03) << 2;
84 	ram->mr[1] |= (ds & 0x03) << 0;
85 
86 	/* this seems wrong, alternate field used for the broadcast
87 	 * on nuts vs non-nuts configs..  meh, it matches for now.
88 	 */
89 	ram->mr1_nuts = ram->mr[1];
90 	if (nuts) {
91 		ram->mr[1] &= ~0x030;
92 		ram->mr[1] |= (at[1] & 0x03) << 4;
93 	}
94 
95 	ram->mr[3] &= ~0x020;
96 	ram->mr[3] |= (rq & 0x01) << 5;
97 
98 	ram->mr[5] &= ~0x004;
99 	ram->mr[5] |= (l3 << 2);
100 
101 	if (!vo)
102 		vo = (ram->mr[6] & 0xff0) >> 4;
103 	if (ram->mr[6] & 0x001)
104 		pd = 1; /* binary driver does this.. bug? */
105 	ram->mr[6] &= ~0xff1;
106 	ram->mr[6] |= (vo & 0xff) << 4;
107 	ram->mr[6] |= (pd & 0x01) << 0;
108 
109 	if (NOTE00(vr)) {
110 		ram->mr[7] &= ~0x300;
111 		ram->mr[7] |= (vr & 0x03) << 8;
112 	}
113 	ram->mr[7] &= ~0x088;
114 	ram->mr[7] |= (vh & 0x01) << 7;
115 	ram->mr[7] |= (lf & 0x01) << 3;
116 
117 	ram->mr[8] &= ~0x003;
118 	ram->mr[8] |= (WR & 0x10) >> 3;
119 	ram->mr[8] |= (CL & 0x10) >> 4;
120 	return 0;
121 }
122