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

   1 /*
   2  * Copyright 2016 Karol Herbst
   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: Karol Herbst
  23  */
  24 #include <subdev/bios.h>
  25 #include <subdev/bios/bit.h>
  26 #include <subdev/bios/power_budget.h>
  27
  28 static u32
  29 nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
  30                           u8 *len)
  31 {
  32         struct bit_entry bit_P;
  33         u32 power_budget;
  34
  35         if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
  36             bit_P.length < 0x30)
  37                 return 0;
  38
  39         power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
  40         if (!power_budget)
  41                 return 0;
  42
  43         *ver = nvbios_rd08(bios, power_budget);
  44         switch (*ver) {
  45         case 0x20:
  46         case 0x30:
  47                 *hdr = nvbios_rd08(bios, power_budget + 0x1);
  48                 *len = nvbios_rd08(bios, power_budget + 0x2);
  49                 *cnt = nvbios_rd08(bios, power_budget + 0x3);
  50                 return power_budget;
  51         default:
  52                 break;
  53         }
  54
  55         return 0;
  56 }
  57
  58 int
  59 nvbios_power_budget_header(struct nvkm_bios *bios,
  60                            struct nvbios_power_budget *budget)
  61 {
  62         struct nvkm_subdev *subdev = &bios->subdev;
  63         u8 ver, hdr, cnt, len, cap_entry;
  64         u32 header;
  65
  66         if (!bios || !budget)
  67                 return -EINVAL;
  68
  69         header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
  70         if (!header || !cnt)
  71                 return -ENODEV;
  72
  73         switch (ver) {
  74         case 0x20:
  75                 cap_entry = nvbios_rd08(bios, header + 0x9);
  76                 break;
  77         case 0x30:
  78                 cap_entry = nvbios_rd08(bios, header + 0xa);
  79                 break;
  80         default:
  81                 cap_entry = 0xff;
  82         }
  83
  84         if (cap_entry >= cnt && cap_entry != 0xff) {
  85                 nvkm_warn(subdev,
  86                           "invalid cap_entry in power budget table found\n");
  87                 budget->cap_entry = 0xff;
  88                 return -EINVAL;
  89         }
  90
  91         budget->offset = header;
  92         budget->ver = ver;
  93         budget->hlen = hdr;
  94         budget->elen = len;
  95         budget->ecount = cnt;
  96
  97         budget->cap_entry = cap_entry;
  98
  99         return 0;
 100 }
 101
 102 int
 103 nvbios_power_budget_entry(struct nvkm_bios *bios,
 104                           struct nvbios_power_budget *budget,
 105                           u8 idx, struct nvbios_power_budget_entry *entry)
 106 {
 107         u32 entry_offset;
 108
 109         if (!bios || !budget || !budget->offset || idx >= budget->ecount
 110                 || !entry)
 111                 return -EINVAL;
 112
 113         entry_offset = budget->offset + budget->hlen + idx * budget->elen;
 114
 115         if (budget->ver >= 0x20) {
 116                 entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
 117                 entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
 118                 entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
 119         } else {
 120                 entry->min_w = 0;
 121                 entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
 122                 entry->avg_w = entry->max_w;
 123         }
 124
 125         return 0;
 126 }