drivers/gpu/drm/nouveau/core/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
  25 #include "core/device.h"
  26
  27 #include "subdev/bios.h"
  28 #include "subdev/bios/dcb.h"
  29
  30 u16
  31 dcb_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  32 {
  33         struct nouveau_device *device = nv_device(bios);
  34         u16 dcb = 0x0000;
  35
  36         if (device->card_type > NV_04)
  37                 dcb = nv_ro16(bios, 0x36);
  38         if (!dcb) {
  39                 nv_warn(bios, "DCB table not found\n");
  40                 return dcb;
  41         }
  42
  43         *ver = nv_ro08(bios, dcb);
  44
  45         if (*ver >= 0x41) {
  46                 nv_warn(bios, "DCB version 0x%02x unknown\n", *ver);
  47                 return 0x0000;
  48         } else
  49         if (*ver >= 0x30) {
  50                 if (nv_ro32(bios, dcb + 6) == 0x4edcbdcb) {
  51                         *hdr = nv_ro08(bios, dcb + 1);
  52                         *cnt = nv_ro08(bios, dcb + 2);
  53                         *len = nv_ro08(bios, dcb + 3);
  54                         return dcb;
  55                 }
  56         } else
  57         if (*ver >= 0x20) {
  58                 if (nv_ro32(bios, dcb + 4) == 0x4edcbdcb) {
  59                         u16 i2c = nv_ro16(bios, dcb + 2);
  60                         *hdr = 8;
  61                         *cnt = (i2c - dcb) / 8;
  62                         *len = 8;
  63                         return dcb;
  64                 }
  65         } else
  66         if (*ver >= 0x15) {
  67                 if (!nv_memcmp(bios, dcb - 7, "DEV_REC", 7)) {
  68                         u16 i2c = nv_ro16(bios, dcb + 2);
  69                         *hdr = 4;
  70                         *cnt = (i2c - dcb) / 10;
  71                         *len = 10;
  72                         return dcb;
  73                 }
  74         } else {
  75                 /*
  76                  * v1.4 (some NV15/16, NV11+) seems the same as v1.5, but
  77                  * always has the same single (crt) entry, even when tv-out
  78                  * present, so the conclusion is this version cannot really
  79                  * be used.
  80                  *
  81                  * v1.2 tables (some NV6/10, and NV15+) normally have the
  82                  * same 5 entries, which are not specific to the card and so
  83                  * no use.
  84                  *
  85                  * v1.2 does have an I2C table that read_dcb_i2c_table can
  86                  * handle, but cards exist (nv11 in #14821) with a bad i2c
  87                  * table pointer, so use the indices parsed in
  88                  * parse_bmp_structure.
  89                  *
  90                  * v1.1 (NV5+, maybe some NV4) is entirely unhelpful
  91                  */
  92                 nv_warn(bios, "DCB contains no useful data\n");
  93                 return 0x0000;
  94         }
  95
  96         nv_warn(bios, "DCB header validation failed\n");
  97         return 0x0000;
  98 }
  99
 100 u16
 101 dcb_outp(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len)
 102 {
 103         u8  hdr, cnt;
 104         u16 dcb = dcb_table(bios, ver, &hdr, &cnt, len);
 105         if (dcb && idx < cnt)
 106                 return dcb + hdr + (idx * *len);
 107         return 0x0000;
 108 }
 109
 110 static inline u16
 111 dcb_outp_hasht(struct dcb_output *outp)
 112 {
 113         return (outp->extdev << 8) | (outp->location << 4) | outp->type;
 114 }
 115
 116 static inline u16
 117 dcb_outp_hashm(struct dcb_output *outp)
 118 {
 119         return (outp->heads << 8) | (outp->link << 6) | outp->or;
 120 }
 121
 122 u16
 123 dcb_outp_parse(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len,
 124                struct dcb_output *outp)
 125 {
 126         u16 dcb = dcb_outp(bios, idx, ver, len);
 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                                 switch (conf & 0x0f000000) {
 160                                 case 0x0f000000:
 161                                         outp->dpconf.link_nr = 4;
 162                                         break;
 163                                 case 0x03000000:
 164                                         outp->dpconf.link_nr = 2;
 165                                         break;
 166                                 case 0x01000000:
 167                                 default:
 168                                         outp->dpconf.link_nr = 1;
 169                                         break;
 170                                 }
 171
 172                                 /* fall-through... */
 173                         case DCB_OUTPUT_TMDS:
 174                         case DCB_OUTPUT_LVDS:
 175                                 outp->link = (conf & 0x00000030) >> 4;
 176                                 outp->sorconf.link = outp->link; /*XXX*/
 177                                 outp->extdev = 0x00;
 178                                 if (outp->location != 0)
 179                                         outp->extdev = (conf & 0x0000ff00) >> 8;
 180                                 break;
 181                         default:
 182                                 break;
 183                         }
 184                 }
 185
 186                 outp->hasht = dcb_outp_hasht(outp);
 187                 outp->hashm = dcb_outp_hashm(outp);
 188         }
 189         return dcb;
 190 }
 191
 192 u16
 193 dcb_outp_match(struct nouveau_bios *bios, u16 type, u16 mask,
 194                u8 *ver, u8 *len, struct dcb_output *outp)
 195 {
 196         u16 dcb, idx = 0;
 197         while ((dcb = dcb_outp_parse(bios, idx++, ver, len, outp))) {
 198                 if ((dcb_outp_hasht(outp) & 0x00ff) == (type & 0x00ff)) {
 199                         if ((dcb_outp_hashm(outp) & mask) == mask)
 200                                 break;
 201                 }
 202         }
 203         return dcb;
 204 }
 205
 206 int
 207 dcb_outp_foreach(struct nouveau_bios *bios, void *data,
 208                  int (*exec)(struct nouveau_bios *, void *, int, u16))
 209 {
 210         int ret, idx = -1;
 211         u8  ver, len;
 212         u16 outp;
 213
 214         while ((outp = dcb_outp(bios, ++idx, &ver, &len))) {
 215                 if (nv_ro32(bios, outp) == 0x00000000)
 216                         break; /* seen on an NV11 with DCB v1.5 */
 217                 if (nv_ro32(bios, outp) == 0xffffffff)
 218                         break; /* seen on an NV17 with DCB v2.0 */
 219
 220                 if (nv_ro08(bios, outp) == DCB_OUTPUT_UNUSED)
 221                         continue;
 222                 if (nv_ro08(bios, outp) == DCB_OUTPUT_EOL)
 223                         break;
 224
 225                 ret = exec(bios, data, idx, outp);
 226                 if (ret)
 227                         return ret;
 228         }
 229
 230         return 0;
 231 }