LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power

   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
  28static u32
  29nvbios_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
  58int
  59nvbios_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
 102int
 103nvbios_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}
 127