drivers/gpu/drm/nouveau/nvkm/subdev/bios/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
  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) {
  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 }