kernel/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dcb.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/dcb.h>
  26
  27 u16
  28 dcb_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  29 {
  30         struct nvkm_subdev *subdev = &bios->subdev;
  31         struct nvkm_device *device = subdev->device;
  32         u16 dcb = 0x0000;
  33
  34         if (device->card_type > NV_04)
  35                 dcb = nvbios_rd16(bios, 0x36);
  36         if (!dcb) {
  37                 nvkm_warn(subdev, "DCB table not found\n");
  38                 return dcb;
  39         }
  40
  41         *ver = nvbios_rd08(bios, dcb);
  42
  43         if (*ver >= 0x42) {
  44                 nvkm_warn(subdev, "DCB version 0x%02x unknown\n", *ver);
  45                 return 0x0000;
  46         } else
  47         if (*ver >= 0x30) {
  48                 if (nvbios_rd32(bios, dcb + 6) == 0x4edcbdcb) {
  49                         *hdr = nvbios_rd08(bios, dcb + 1);
  50                         *cnt = nvbios_rd08(bios, dcb + 2);
  51                         *len = nvbios_rd08(bios, dcb + 3);
  52                         return dcb;
  53                 }
  54         } else
  55         if (*ver >= 0x20) {
  56                 if (nvbios_rd32(bios, dcb + 4) == 0x4edcbdcb) {
  57                         u16 i2c = nvbios_rd16(bios, dcb + 2);
  58                         *hdr = 8;
  59                         *cnt = (i2c - dcb) / 8;
  60                         *len = 8;
  61                         return dcb;
  62                 }
  63         } else
  64         if (*ver >= 0x15) {
  65                 if (!nvbios_memcmp(bios, dcb - 7, "DEV_REC", 7)) {
  66                         u16 i2c = nvbios_rd16(bios, dcb + 2);
  67                         *hdr = 4;
  68                         *cnt = (i2c - dcb) / 10;
  69                         *len = 10;
  70                         return dcb;
  71                 }
  72         } else {
  73                 /*
  74                  * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but
  75                  * always has the same single (crt) entry, even when tv-out
  76                  * present, so the conclusion is this version cannot really
  77                  * be used.
  78                  *
  79                  * v1.2 tables (some NV6/10, and NV15+) normally have the
  80                  * same 5 entries, which are not specific to the card and so
  81                  * no use.
  82                  *
  83                  * v1.2 does have an I2C table that read_dcb_i2c_table can
  84                  * handle, but cards exist (nv11 in #14821) with a bad i2c
  85                  * table pointer, so use the indices parsed in
  86                  * parse_bmp_structure.
  87                  *
  88                  * v1.1 (NV5+, maybe some NV4) is entirely unhelpful
  89                  */
  90                 nvkm_debug(subdev, "DCB contains no useful data\n");
  91                 return 0x0000;
  92         }
  93
  94         nvkm_warn(subdev, "DCB header validation failed\n");
  95         return 0x0000;
  96 }
  97
  98 u16
  99 dcb_outp(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
 100 {
 101         u8  hdr, cnt;
 102         u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len);
 103         if (dcb && idx < cnt)
 104                 return dcb + hdr + (idx * *len);
 105         return 0x0000;
 106 }
 107
 108 static inline u16
 109 dcb_outp_hasht(struct dcb_output *outp)
 110 {
 111         return (outp->extdev << 8) | (outp->location << 4) | outp->type;
 112 }
 113
 114 static inline u16
 115 dcb_outp_hashm(struct dcb_output *outp)
 116 {
 117         return (outp->heads << 8) | (outp->link << 6) | outp->or;
 118 }
 119
 120 u16
 121 dcb_outp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len,
 122                struct dcb_output *outp)
 123 {
 124         u16 dcb = dcb_outp(bios, idx, ver, len);
 125         memset(outp, 0x00, sizeof(*outp));
 126         if (dcb) {
 127                 if (*ver >= 0x20) {
 128                         u32 conn = nvbios_rd32(bios, dcb + 0x00);
 129                         outp->or        = (conn & 0x0f000000) >> 24;
 130                         outp->location  = (conn & 0x00300000) >> 20;
 131                         outp->bus       = (conn & 0x000f0000) >> 16;
 132                         outp->connector = (conn & 0x0000f000) >> 12;
 133                         outp->heads     = (conn & 0x00000f00) >> 8;
 134                         outp->i2c_index = (conn & 0x000000f0) >> 4;
 135                         outp->type      = (conn & 0x0000000f);
 136                         outp->link      = 0;
 137                 } else {
 138                         dcb = 0x0000;
 139                 }
 140
 141                 if (*ver >= 0x40) {
 142                         u32 conf = nvbios_rd32(bios, dcb + 0x04);
 143                         switch (outp->type) {
 144                         case DCB_OUTPUT_DP:
 145                                 switch (conf & 0x00e00000) {
 146                                 case 0x00000000:
 147                                         outp->dpconf.link_bw = 0x06;
 148                                         break;
 149                                 case 0x00200000:
 150                                         outp->dpconf.link_bw = 0x0a;
 151                                         break;
 152                                 case 0x00400000:
 153                                 default:
 154                                         outp->dpconf.link_bw = 0x14;
 155                                         break;
 156                                 }
 157
 158                                 switch ((conf & 0x0f000000) >> 24) {
 159                                 case 0xf:
 160                                 case 0x4:
 161                                         outp->dpconf.link_nr = 4;
 162                                         break;
 163                                 case 0x3:
 164                                 case 0x2:
 165                                         outp->dpconf.link_nr = 2;
 166                                         break;
 167                                 case 0x1:
 168                                 default:
 169                                         outp->dpconf.link_nr = 1;
 170                                         break;
 171                                 }
 172
 173                                 /* fall-through... */
 174                         case DCB_OUTPUT_TMDS:
 175                         case DCB_OUTPUT_LVDS:
 176                                 outp->link = (conf & 0x00000030) >> 4;
 177                                 outp->sorconf.link = outp->link; /*XXX*/
 178                                 outp->extdev = 0x00;
 179                                 if (outp->location != 0)
 180                                         outp->extdev = (conf & 0x0000ff00) >> 8;
 181                                 break;
 182                         default:
 183                                 break;
 184                         }
 185                 }
 186
 187                 outp->hasht = dcb_outp_hasht(outp);
 188                 outp->hashm = dcb_outp_hashm(outp);
 189         }
 190         return dcb;
 191 }
 192
 193 u16
 194 dcb_outp_match(struct nvkm_bios *bios, u16 type, u16 mask,
 195                u8 *ver, u8 *len, struct dcb_output *outp)
 196 {
 197         u16 dcb, idx = 0;
 198         while ((dcb = dcb_outp_parse(bios, idx++, ver, len, outp))) {
 199                 if ((dcb_outp_hasht(outp) & 0x00ff) == (type & 0x00ff)) {
 200                         if ((dcb_outp_hashm(outp) & mask) == mask)
 201                                 break;
 202                 }
 203         }
 204         return dcb;
 205 }
 206
 207 int
 208 dcb_outp_foreach(struct nvkm_bios *bios, void *data,
 209                  int (*exec)(struct nvkm_bios *, void *, int, u16))
 210 {
 211         int ret, idx = -1;
 212         u8  ver, len;
 213         u16 outp;
 214
 215         while ((outp = dcb_outp(bios, ++idx, &ver, &len))) {
 216                 if (nvbios_rd32(bios, outp) == 0x00000000)
 217                         break; /* seen on an NV11 with DCB v1.5 */
 218                 if (nvbios_rd32(bios, outp) == 0xffffffff)
 219                         break; /* seen on an NV17 with DCB v2.0 */
 220
 221                 if (nvbios_rd08(bios, outp) == DCB_OUTPUT_UNUSED)
 222                         continue;
 223                 if (nvbios_rd08(bios, outp) == DCB_OUTPUT_EOL)
 224                         break;
 225
 226                 ret = exec(bios, data, idx, outp);
 227                 if (ret)
 228                         return ret;
 229         }
 230
 231         return 0;
 232 }