mxm.c

  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
 28u16
 29mxm_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 */
 54static 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
 59static 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
 64static 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
 69static 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
 74u8
 75mxm_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
111u8
112mxm_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}