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

   1 /*
   2  * Copyright 2014 Martin Peres
   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/fan.h>
  27
  28 u16
  29 nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
  30 {
  31         struct bit_entry bit_P;
  32         u16 fan = 0x0000;
  33
  34         if (!bit_entry(bios, 'P', &bit_P)) {
  35                 if (bit_P.version == 2 && bit_P.length >= 0x5a)
  36                         fan = nv_ro16(bios, bit_P.offset + 0x58);
  37
  38                 if (fan) {
  39                         *ver = nv_ro08(bios, fan + 0);
  40                         switch (*ver) {
  41                         case 0x10:
  42                                 *hdr = nv_ro08(bios, fan + 1);
  43                                 *len = nv_ro08(bios, fan + 2);
  44                                 *cnt = nv_ro08(bios, fan + 3);
  45                                 return fan;
  46                         default:
  47                                 break;
  48                         }
  49                 }
  50         }
  51
  52         return 0x0000;
  53 }
  54
  55 u16
  56 nvbios_fan_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
  57                  u8 *cnt, u8 *len)
  58 {
  59         u16 data = nvbios_fan_table(bios, ver, hdr, cnt, len);
  60         if (data && idx < *cnt)
  61                 return data + *hdr + (idx * (*len));
  62         return 0x0000;
  63 }
  64
  65 u16
  66 nvbios_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
  67 {
  68         u8 ver, hdr, cnt, len;
  69
  70         u16 data = nvbios_fan_entry(bios, 0, &ver, &hdr, &cnt, &len);
  71         if (data) {
  72                 u8 type = nv_ro08(bios, data + 0x00);
  73                 switch (type) {
  74                 case 0:
  75                         fan->type = NVBIOS_THERM_FAN_TOGGLE;
  76                         break;
  77                 case 1:
  78                 case 2:
  79                         /* TODO: Understand the difference between the two! */
  80                         fan->type = NVBIOS_THERM_FAN_PWM;
  81                         break;
  82                 default:
  83                         fan->type = NVBIOS_THERM_FAN_UNK;
  84                 }
  85
  86                 fan->min_duty = nv_ro08(bios, data + 0x02);
  87                 fan->max_duty = nv_ro08(bios, data + 0x03);
  88
  89                 fan->pwm_freq = nv_ro32(bios, data + 0x0b) & 0xffffff;
  90         }
  91
  92         return data;
  93 }