1 /* $NetBSD: nouveau_nvkm_subdev_bios_mxm.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2012 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
25 */
26 #include <sys/cdefs.h>
27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_mxm.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
28
29 #include <subdev/bios.h>
30 #include <subdev/bios/bit.h>
31 #include <subdev/bios/mxm.h>
32
33 u16
mxm_table(struct nvkm_bios * bios,u8 * ver,u8 * hdr)34 mxm_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr)
35 {
36 struct nvkm_subdev *subdev = &bios->subdev;
37 struct bit_entry x;
38
39 if (bit_entry(bios, 'x', &x)) {
40 nvkm_debug(subdev, "BIT 'x' table not present\n");
41 return 0x0000;
42 }
43
44 *ver = x.version;
45 *hdr = x.length;
46 if (*ver != 1 || *hdr < 3) {
47 nvkm_warn(subdev, "BIT 'x' table %d/%d unknown\n", *ver, *hdr);
48 return 0x0000;
49 }
50
51 return x.offset;
52 }
53
54 /* These map MXM v2.x digital connection values to the appropriate SOR/link,
55 * hopefully they're correct for all boards within the same chipset...
56 *
57 * MXM v3.x VBIOS are nicer and provide pointers to these tables.
58 */
59 static u8 g84_sor_map[16] = {
60 0x00, 0x12, 0x22, 0x11, 0x32, 0x31, 0x11, 0x31,
61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
62 };
63
64 static u8 g92_sor_map[16] = {
65 0x00, 0x12, 0x22, 0x11, 0x32, 0x31, 0x11, 0x31,
66 0x11, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
67 };
68
69 static u8 g94_sor_map[16] = {
70 0x00, 0x14, 0x24, 0x11, 0x34, 0x31, 0x11, 0x31,
71 0x11, 0x31, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00
72 };
73
74 static u8 g98_sor_map[16] = {
75 0x00, 0x14, 0x12, 0x11, 0x00, 0x31, 0x11, 0x31,
76 0x11, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
77 };
78
79 u8
mxm_sor_map(struct nvkm_bios * bios,u8 conn)80 mxm_sor_map(struct nvkm_bios *bios, u8 conn)
81 {
82 struct nvkm_subdev *subdev = &bios->subdev;
83 u8 ver, hdr;
84 u16 mxm = mxm_table(bios, &ver, &hdr);
85 if (mxm && hdr >= 6) {
86 u16 map = nvbios_rd16(bios, mxm + 4);
87 if (map) {
88 ver = nvbios_rd08(bios, map);
89 if (ver == 0x10 || ver == 0x11) {
90 if (conn < nvbios_rd08(bios, map + 3)) {
91 map += nvbios_rd08(bios, map + 1);
92 map += conn;
93 return nvbios_rd08(bios, map);
94 }
95
96 return 0x00;
97 }
98
99 nvkm_warn(subdev, "unknown sor map v%02x\n", ver);
100 }
101 }
102
103 if (bios->version.chip == 0x84 || bios->version.chip == 0x86)
104 return g84_sor_map[conn];
105 if (bios->version.chip == 0x92)
106 return g92_sor_map[conn];
107 if (bios->version.chip == 0x94 || bios->version.chip == 0x96)
108 return g94_sor_map[conn];
109 if (bios->version.chip == 0x98)
110 return g98_sor_map[conn];
111
112 nvkm_warn(subdev, "missing sor map\n");
113 return 0x00;
114 }
115
116 u8
mxm_ddc_map(struct nvkm_bios * bios,u8 port)117 mxm_ddc_map(struct nvkm_bios *bios, u8 port)
118 {
119 struct nvkm_subdev *subdev = &bios->subdev;
120 u8 ver, hdr;
121 u16 mxm = mxm_table(bios, &ver, &hdr);
122 if (mxm && hdr >= 8) {
123 u16 map = nvbios_rd16(bios, mxm + 6);
124 if (map) {
125 ver = nvbios_rd08(bios, map);
126 if (ver == 0x10) {
127 if (port < nvbios_rd08(bios, map + 3)) {
128 map += nvbios_rd08(bios, map + 1);
129 map += port;
130 return nvbios_rd08(bios, map);
131 }
132
133 return 0x00;
134 }
135
136 nvkm_warn(subdev, "unknown ddc map v%02x\n", ver);
137 }
138 }
139
140 /* v2.x: directly write port as dcb i2cidx */
141 return (port << 4) | port;
142 }
143