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