drivers/gpu/drm/nouveau/nvkm/subdev/bios/vmap.c

   1 /*
   2  * Copyright 2012 Nouveau Community
   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: Martin Peres
  23  */
  24 #include <subdev/bios.h>
  25 #include <subdev/bios/bit.h>
  26 #include <subdev/bios/vmap.h>
  27
  28 u16
  29 nvbios_vmap_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  30 {
  31         struct bit_entry bit_P;
  32         u16 vmap = 0x0000;
  33
  34         if (!bit_entry(bios, 'P', &bit_P)) {
  35                 if (bit_P.version == 2) {
  36                         vmap = nvbios_rd16(bios, bit_P.offset + 0x20);
  37                         if (vmap) {
  38                                 *ver = nvbios_rd08(bios, vmap + 0);
  39                                 switch (*ver) {
  40                                 case 0x10:
  41                                 case 0x20:
  42                                         *hdr = nvbios_rd08(bios, vmap + 1);
  43                                         *cnt = nvbios_rd08(bios, vmap + 3);
  44                                         *len = nvbios_rd08(bios, vmap + 2);
  45                                         return vmap;
  46                                 default:
  47                                         break;
  48                                 }
  49                         }
  50                 }
  51         }
  52
  53         return 0x0000;
  54 }
  55
  56 u16
  57 nvbios_vmap_parse(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
  58                   struct nvbios_vmap *info)
  59 {
  60         u16 vmap = nvbios_vmap_table(bios, ver, hdr, cnt, len);
  61         memset(info, 0x00, sizeof(*info));
  62         switch (!!vmap * *ver) {
  63         case 0x10:
  64         case 0x20:
  65                 break;
  66         }
  67         return vmap;
  68 }
  69
  70 u16
  71 nvbios_vmap_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
  72 {
  73         u8  hdr, cnt;
  74         u16 vmap = nvbios_vmap_table(bios, ver, &hdr, &cnt, len);
  75         if (vmap && idx < cnt) {
  76                 vmap = vmap + hdr + (idx * *len);
  77                 return vmap;
  78         }
  79         return 0x0000;
  80 }
  81
  82 u16
  83 nvbios_vmap_entry_parse(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len,
  84                         struct nvbios_vmap_entry *info)
  85 {
  86         u16 vmap = nvbios_vmap_entry(bios, idx, ver, len);
  87         memset(info, 0x00, sizeof(*info));
  88         switch (!!vmap * *ver) {
  89         case 0x10:
  90                 info->link   = 0xff;
  91                 info->min    = nvbios_rd32(bios, vmap + 0x00);
  92                 info->max    = nvbios_rd32(bios, vmap + 0x04);
  93                 info->arg[0] = nvbios_rd32(bios, vmap + 0x08);
  94                 info->arg[1] = nvbios_rd32(bios, vmap + 0x0c);
  95                 info->arg[2] = nvbios_rd32(bios, vmap + 0x10);
  96                 break;
  97         case 0x20:
  98                 info->unk0   = nvbios_rd08(bios, vmap + 0x00);
  99                 info->link   = nvbios_rd08(bios, vmap + 0x01);
 100                 info->min    = nvbios_rd32(bios, vmap + 0x02);
 101                 info->max    = nvbios_rd32(bios, vmap + 0x06);
 102                 info->arg[0] = nvbios_rd32(bios, vmap + 0x0a);
 103                 info->arg[1] = nvbios_rd32(bios, vmap + 0x0e);
 104                 info->arg[2] = nvbios_rd32(bios, vmap + 0x12);
 105                 info->arg[3] = nvbios_rd32(bios, vmap + 0x16);
 106                 info->arg[4] = nvbios_rd32(bios, vmap + 0x1a);
 107                 info->arg[5] = nvbios_rd32(bios, vmap + 0x1e);
 108                 break;
 109         }
 110         return vmap;
 111 }