1/*	$NetBSD: nouveau_nvkm_subdev_fb_gddr5.c,v 1.3 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 */
26#include <sys/cdefs.h>
27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_fb_gddr5.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $");
28
29#include "ram.h"
30
31/* binary driver only executes this path if the condition (a) is true
32 * for any configuration (combination of rammap+ramcfg+timing) that
33 * can be reached on a given card.  for now, we will execute the branch
34 * unconditionally in the hope that a "false everywhere" in the bios
35 * tables doesn't actually mean "don't touch this".
36 */
37#define NOTE00(a) 1
38
39int
40nvkm_gddr5_calc(struct nvkm_ram *ram, bool nuts)
41{
42	int pd, lf, xd, vh, vr, vo, l3;
43	int WL, CL, WR, at[2], dt, ds;
44	int rq = ram->freq < 1000000; /* XXX */
45
46	xd = !ram->next->bios.ramcfg_DLLoff;
47
48	switch (ram->next->bios.ramcfg_ver) {
49	case 0x11:
50		pd =  ram->next->bios.ramcfg_11_01_80;
51		lf =  ram->next->bios.ramcfg_11_01_40;
52		vh =  ram->next->bios.ramcfg_11_02_10;
53		vr =  ram->next->bios.ramcfg_11_02_04;
54		vo =  ram->next->bios.ramcfg_11_06;
55		l3 = !ram->next->bios.ramcfg_11_07_02;
56		break;
57	default:
58		return -ENOSYS;
59	}
60
61	switch (ram->next->bios.timing_ver) {
62	case 0x20:
63		WL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
64		CL = (ram->next->bios.timing[1] & 0x0000001f);
65		WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
66		at[0] = ram->next->bios.timing_20_2e_c0;
67		at[1] = ram->next->bios.timing_20_2e_30;
68		dt =  ram->next->bios.timing_20_2e_03;
69		ds =  ram->next->bios.timing_20_2f_03;
70		break;
71	default:
72		return -ENOSYS;
73	}
74
75	if (WL < 1 || WL > 7 || CL < 5 || CL > 36 || WR < 4 || WR > 35)
76		return -EINVAL;
77	CL -= 5;
78	WR -= 4;
79
80	ram->mr[0] &= ~0xf7f;
81	ram->mr[0] |= (WR & 0x0f) << 8;
82	ram->mr[0] |= (CL & 0x0f) << 3;
83	ram->mr[0] |= (WL & 0x07) << 0;
84
85	ram->mr[1] &= ~0x0bf;
86	ram->mr[1] |= (xd & 0x01) << 7;
87	ram->mr[1] |= (at[0] & 0x03) << 4;
88	ram->mr[1] |= (dt & 0x03) << 2;
89	ram->mr[1] |= (ds & 0x03) << 0;
90
91	/* this seems wrong, alternate field used for the broadcast
92	 * on nuts vs non-nuts configs..  meh, it matches for now.
93	 */
94	ram->mr1_nuts = ram->mr[1];
95	if (nuts) {
96		ram->mr[1] &= ~0x030;
97		ram->mr[1] |= (at[1] & 0x03) << 4;
98	}
99
100	ram->mr[3] &= ~0x020;
101	ram->mr[3] |= (rq & 0x01) << 5;
102
103	ram->mr[5] &= ~0x004;
104	ram->mr[5] |= (l3 << 2);
105
106	if (!vo)
107		vo = (ram->mr[6] & 0xff0) >> 4;
108	if (ram->mr[6] & 0x001)
109		pd = 1; /* binary driver does this.. bug? */
110	ram->mr[6] &= ~0xff1;
111	ram->mr[6] |= (vo & 0xff) << 4;
112	ram->mr[6] |= (pd & 0x01) << 0;
113
114	if (NOTE00(vr)) {
115		ram->mr[7] &= ~0x300;
116		ram->mr[7] |= (vr & 0x03) << 8;
117	}
118	ram->mr[7] &= ~0x088;
119	ram->mr[7] |= (vh & 0x01) << 7;
120	ram->mr[7] |= (lf & 0x01) << 3;
121
122	ram->mr[8] &= ~0x003;
123	ram->mr[8] |= (WR & 0x10) >> 3;
124	ram->mr[8] |= (CL & 0x10) >> 4;
125	return 0;
126}
127