linux/drivers/gpu/drm/nouveau/nvkm/subdev/bios/dcb.c
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   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
  27u16
  28dcb_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
  98u16
  99dcb_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
 108static inline u16
 109dcb_outp_hasht(struct dcb_output *outp)
 110{
 111        return (outp->extdev << 8) | (outp->location << 4) | outp->type;
 112}
 113
 114static inline u16
 115dcb_outp_hashm(struct dcb_output *outp)
 116{
 117        return (outp->heads << 8) | (outp->link << 6) | outp->or;
 118}
 119
 120u16
 121dcb_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: /* 1.62 */
 147                                        outp->dpconf.link_bw = 0x06;
 148                                        break;
 149                                case 0x00200000: /* 2.7 */
 150                                        outp->dpconf.link_bw = 0x0a;
 151                                        break;
 152                                case 0x00400000: /* 5.4 */
 153                                        outp->dpconf.link_bw = 0x14;
 154                                        break;
 155                                case 0x00600000: /* 8.1 */
 156                                default:
 157                                        outp->dpconf.link_bw = 0x1e;
 158                                        break;
 159                                }
 160
 161                                switch ((conf & 0x0f000000) >> 24) {
 162                                case 0xf:
 163                                case 0x4:
 164                                        outp->dpconf.link_nr = 4;
 165                                        break;
 166                                case 0x3:
 167                                case 0x2:
 168                                        outp->dpconf.link_nr = 2;
 169                                        break;
 170                                case 0x1:
 171                                default:
 172                                        outp->dpconf.link_nr = 1;
 173                                        break;
 174                                }
 175
 176                                /* fall-through... */
 177                        case DCB_OUTPUT_TMDS:
 178                        case DCB_OUTPUT_LVDS:
 179                                outp->link = (conf & 0x00000030) >> 4;
 180                                outp->sorconf.link = outp->link; /*XXX*/
 181                                outp->extdev = 0x00;
 182                                if (outp->location != 0)
 183                                        outp->extdev = (conf & 0x0000ff00) >> 8;
 184                                break;
 185                        default:
 186                                break;
 187                        }
 188                }
 189
 190                outp->hasht = dcb_outp_hasht(outp);
 191                outp->hashm = dcb_outp_hashm(outp);
 192        }
 193        return dcb;
 194}
 195
 196u16
 197dcb_outp_match(struct nvkm_bios *bios, u16 type, u16 mask,
 198               u8 *ver, u8 *len, struct dcb_output *outp)
 199{
 200        u16 dcb, idx = 0;
 201        while ((dcb = dcb_outp_parse(bios, idx++, ver, len, outp))) {
 202                if ((dcb_outp_hasht(outp) & 0x00ff) == (type & 0x00ff)) {
 203                        if ((dcb_outp_hashm(outp) & mask) == mask)
 204                                break;
 205                }
 206        }
 207        return dcb;
 208}
 209
 210int
 211dcb_outp_foreach(struct nvkm_bios *bios, void *data,
 212                 int (*exec)(struct nvkm_bios *, void *, int, u16))
 213{
 214        int ret, idx = -1;
 215        u8  ver, len;
 216        u16 outp;
 217
 218        while ((outp = dcb_outp(bios, ++idx, &ver, &len))) {
 219                if (nvbios_rd32(bios, outp) == 0x00000000)
 220                        break; /* seen on an NV11 with DCB v1.5 */
 221                if (nvbios_rd32(bios, outp) == 0xffffffff)
 222                        break; /* seen on an NV17 with DCB v2.0 */
 223
 224                if (nvbios_rd08(bios, outp) == DCB_OUTPUT_UNUSED)
 225                        continue;
 226                if (nvbios_rd08(bios, outp) == DCB_OUTPUT_EOL)
 227                        break;
 228
 229                ret = exec(bios, data, idx, outp);
 230                if (ret)
 231                        return ret;
 232        }
 233
 234        return 0;
 235}
 236