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 #include <core/device.h>
  28
  29 u16
  30 dcb_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  31 {
  32         struct nvkm_device *device = nv_device(bios);
  33         u16 dcb = 0x0000;
  34
  35         if (device->card_type > NV_04)
  36                 dcb = nv_ro16(bios, 0x36);
  37         if (!dcb) {
  38                 nv_warn(bios, "DCB table not found\n");
  39                 return dcb;
  40         }
  41
  42         *ver = nv_ro08(bios, dcb);
  43
  44         if (*ver >= 0x42) {
  45                 nv_warn(bios, "DCB version 0x%02x unknown\n", *ver);
  46                 return 0x0000;
  47         } else
  48         if (*ver >= 0x30) {
  49                 if (nv_ro32(bios, dcb + 6) == 0x4edcbdcb) {
  50                         *hdr = nv_ro08(bios, dcb + 1);
  51                         *cnt = nv_ro08(bios, dcb + 2);
  52                         *len = nv_ro08(bios, dcb + 3);
  53                         return dcb;
  54                 }
  55         } else
  56         if (*ver >= 0x20) {
  57                 if (nv_ro32(bios, dcb + 4) == 0x4edcbdcb) {
  58                         u16 i2c = nv_ro16(bios, dcb + 2);
  59                         *hdr = 8;
  60                         *cnt = (i2c - dcb) / 8;
  61                         *len = 8;
  62                         return dcb;
  63                 }
  64         } else
  65         if (*ver >= 0x15) {
  66                 if (!nv_memcmp(bios, dcb - 7, "DEV_REC", 7)) {
  67                         u16 i2c = nv_ro16(bios, dcb + 2);
  68                         *hdr = 4;
  69                         *cnt = (i2c - dcb) / 10;
  70                         *len = 10;
  71                         return dcb;
  72                 }
  73         } else {
  74                 /*
  75                  * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but
  76                  * always has the same single (crt) entry, even when tv-out
  77                  * present, so the conclusion is this version cannot really
  78                  * be used.
  79                  *
  80                  * v1.2 tables (some NV6/10, and NV15+) normally have the
  81                  * same 5 entries, which are not specific to the card and so
  82                  * no use.
  83                  *
  84                  * v1.2 does have an I2C table that read_dcb_i2c_table can
  85                  * handle, but cards exist (nv11 in #14821) with a bad i2c
  86                  * table pointer, so use the indices parsed in
  87                  * parse_bmp_structure.
  88                  *
  89                  * v1.1 (NV5+, maybe some NV4) is entirely unhelpful
  90                  */
  91                 nv_warn(bios, "DCB contains no useful data\n");
  92                 return 0x0000;
  93         }
  94
  95         nv_warn(bios, "DCB header validation failed\n");
  96         return 0x0000;
  97 }
  98
  99 u16
 100 dcb_outp(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len)
 101 {
 102         u8  hdr, cnt;
 103         u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len);
 104         if (dcb && idx < cnt)
 105                 return dcb + hdr + (idx * *len);
 106         return 0x0000;
 107 }
 108
 109 static inline u16
 110 dcb_outp_hasht(struct dcb_output *outp)
 111 {
 112         return (outp->extdev << 8) | (outp->location << 4) | outp->type;
 113 }
 114
 115 static inline u16
 116 dcb_outp_hashm(struct dcb_output *outp)
 117 {
 118         return (outp->heads << 8) | (outp->link << 6) | outp->or;
 119 }
 120
 121 u16
 122 dcb_outp_parse(struct nvkm_bios *bios, u8 idx, u8 *ver, u8 *len,
 123                struct dcb_output *outp)
 124 {
 125         u16 dcb = dcb_outp(bios, idx, ver, len);
 126         memset(outp, 0x00, sizeof(*outp));
 127         if (dcb) {
 128                 if (*ver >= 0x20) {
 129                         u32 conn = nv_ro32(bios, dcb + 0x00);
 130                         outp->or        = (conn & 0x0f000000) >> 24;
 131                         outp->location  = (conn & 0x00300000) >> 20;
 132                         outp->bus       = (conn & 0x000f0000) >> 16;
 133                         outp->connector = (conn & 0x0000f000) >> 12;
 134                         outp->heads     = (conn & 0x00000f00) >> 8;
 135                         outp->i2c_index = (conn & 0x000000f0) >> 4;
 136                         outp->type      = (conn & 0x0000000f);
 137                         outp->link      = 0;
 138                 } else {
 139                         dcb = 0x0000;
 140                 }
 141
 142                 if (*ver >= 0x40) {
 143                         u32 conf = nv_ro32(bios, dcb + 0x04);
 144                         switch (outp->type) {
 145                         case DCB_OUTPUT_DP:
 146                                 switch (conf & 0x00e00000) {
 147                                 case 0x00000000:
 148                                         outp->dpconf.link_bw = 0x06;
 149                                         break;
 150                                 case 0x00200000:
 151                                         outp->dpconf.link_bw = 0x0a;
 152                                         break;
 153                                 case 0x00400000:
 154                                 default:
 155                                         outp->dpconf.link_bw = 0x14;
 156                                         break;
 157                                 }
 158
 159                                 outp->dpconf.link_nr = (conf & 0x0f000000) >> 24;
 160                                 if (*ver < 0x41) {
 161                                         switch (outp->dpconf.link_nr) {
 162                                         case 0x0f:
 163                                                 outp->dpconf.link_nr = 4;
 164                                                 break;
 165                                         case 0x03:
 166                                                 outp->dpconf.link_nr = 2;
 167                                                 break;
 168                                         case 0x01:
 169                                         default:
 170                                                 outp->dpconf.link_nr = 1;
 171                                                 break;
 172                                         }
 173                                 }
 174
 175                                 /* fall-through... */
 176                         case DCB_OUTPUT_TMDS:
 177                         case DCB_OUTPUT_LVDS:
 178                                 outp->link = (conf & 0x00000030) >> 4;
 179                                 outp->sorconf.link = outp->link; /*XXX*/
 180                                 outp->extdev = 0x00;
 181                                 if (outp->location != 0)
 182                                         outp->extdev = (conf & 0x0000ff00) >> 8;
 183                                 break;
 184                         default:
 185                                 break;
 186                         }
 187                 }
 188
 189                 outp->hasht = dcb_outp_hasht(outp);
 190                 outp->hashm = dcb_outp_hashm(outp);
 191         }
 192         return dcb;
 193 }
 194
 195 u16
 196 dcb_outp_match(struct nvkm_bios *bios, u16 type, u16 mask,
 197                u8 *ver, u8 *len, struct dcb_output *outp)
 198 {
 199         u16 dcb, idx = 0;
 200         while ((dcb = dcb_outp_parse(bios, idx++, ver, len, outp))) {
 201                 if ((dcb_outp_hasht(outp) & 0x00ff) == (type & 0x00ff)) {
 202                         if ((dcb_outp_hashm(outp) & mask) == mask)
 203                                 break;
 204                 }
 205         }
 206         return dcb;
 207 }
 208
 209 int
 210 dcb_outp_foreach(struct nvkm_bios *bios, void *data,
 211                  int (*exec)(struct nvkm_bios *, void *, int, u16))
 212 {
 213         int ret, idx = -1;
 214         u8  ver, len;
 215         u16 outp;
 216
 217         while ((outp = dcb_outp(bios, ++idx, &ver, &len))) {
 218                 if (nv_ro32(bios, outp) == 0x00000000)
 219                         break; /* seen on an NV11 with DCB v1.5 */
 220                 if (nv_ro32(bios, outp) == 0xffffffff)
 221                         break; /* seen on an NV17 with DCB v2.0 */
 222
 223                 if (nv_ro08(bios, outp) == DCB_OUTPUT_UNUSED)
 224                         continue;
 225                 if (nv_ro08(bios, outp) == DCB_OUTPUT_EOL)
 226                         break;
 227
 228                 ret = exec(bios, data, idx, outp);
 229                 if (ret)
 230                         return ret;
 231         }
 232
 233         return 0;
 234 }