1/* $NetBSD: nouveau_subdev_bios_mxm.c,v 1.1.1.1 2014/08/06 12:36:29 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
27#include <sys/cdefs.h>
28__KERNEL_RCSID(0, "$NetBSD: nouveau_subdev_bios_mxm.c,v 1.1.1.1 2014/08/06 12:36:29 riastradh Exp $");
29
30#include <subdev/bios.h>
31#include <subdev/bios/bit.h>
32#include <subdev/bios/mxm.h>
33
34u16
35mxm_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr)
36{
37 struct bit_entry x;
38
39 if (bit_entry(bios, 'x', &x)) {
40 nv_debug(bios, "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 nv_warn(bios, "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 */
59static u8 nv84_sor_map[16] = {
60 0x00, 0x12, 0x22, 0x11, 0x32, 0x31, 0x11, 0x31,
61 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
62};
63
64static u8 nv92_sor_map[16] = {
65 0x00, 0x12, 0x22, 0x11, 0x32, 0x31, 0x11, 0x31,
66 0x11, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
67};
68
69static u8 nv94_sor_map[16] = {
70 0x00, 0x14, 0x24, 0x11, 0x34, 0x31, 0x11, 0x31,
71 0x11, 0x31, 0x12, 0x00, 0x00, 0x00, 0x00, 0x00
72};
73
74static u8 nv98_sor_map[16] = {
75 0x00, 0x14, 0x12, 0x11, 0x00, 0x31, 0x11, 0x31,
76 0x11, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
77};
78
79u8
80mxm_sor_map(struct nouveau_bios *bios, u8 conn)
81{
82 u8 ver, hdr;
83 u16 mxm = mxm_table(bios, &ver, &hdr);
84 if (mxm && hdr >= 6) {
85 u16 map = nv_ro16(bios, mxm + 4);
86 if (map) {
87 ver = nv_ro08(bios, map);
88 if (ver == 0x10) {
89 if (conn < nv_ro08(bios, map + 3)) {
90 map += nv_ro08(bios, map + 1);
91 map += conn;
92 return nv_ro08(bios, map);
93 }
94
95 return 0x00;
96 }
97
98 nv_warn(bios, "unknown sor map v%02x\n", ver);
99 }
100 }
101
102 if (bios->version.chip == 0x84 || bios->version.chip == 0x86)
103 return nv84_sor_map[conn];
104 if (bios->version.chip == 0x92)
105 return nv92_sor_map[conn];
106 if (bios->version.chip == 0x94 || bios->version.chip == 0x96)
107 return nv94_sor_map[conn];
108 if (bios->version.chip == 0x98)
109 return nv98_sor_map[conn];
110
111 nv_warn(bios, "missing sor map\n");
112 return 0x00;
113}
114
115u8
116mxm_ddc_map(struct nouveau_bios *bios, u8 port)
117{
118 u8 ver, hdr;
119 u16 mxm = mxm_table(bios, &ver, &hdr);
120 if (mxm && hdr >= 8) {
121 u16 map = nv_ro16(bios, mxm + 6);
122 if (map) {
123 ver = nv_ro08(bios, map);
124 if (ver == 0x10) {
125 if (port < nv_ro08(bios, map + 3)) {
126 map += nv_ro08(bios, map + 1);
127 map += port;
128 return nv_ro08(bios, map);
129 }
130
131 return 0x00;
132 }
133
134 nv_warn(bios, "unknown ddc map v%02x\n", ver);
135 }
136 }
137
138 /* v2.x: directly write port as dcb i2cidx */
139 return (port << 4) | port;
140}
141