kernel/drivers/gpu/drm/nouveau/nvkm/subdev/bios/therm.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/therm.h>
  27
  28 static u16
  29 therm_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
  30 {
  31         struct bit_entry bit_P;
  32         u16 therm = 0;
  33
  34         if (!bit_entry(bios, 'P', &bit_P)) {
  35                 if (bit_P.version == 1)
  36                         therm = nvbios_rd16(bios, bit_P.offset + 12);
  37                 else if (bit_P.version == 2)
  38                         therm = nvbios_rd16(bios, bit_P.offset + 16);
  39                 else
  40                         nvkm_error(&bios->subdev,
  41                                    "unknown offset for thermal in BIT P %d\n",
  42                                    bit_P.version);
  43         }
  44
  45         /* exit now if we haven't found the thermal table */
  46         if (!therm)
  47                 return 0x0000;
  48
  49         *ver = nvbios_rd08(bios, therm + 0);
  50         *hdr = nvbios_rd08(bios, therm + 1);
  51         *len = nvbios_rd08(bios, therm + 2);
  52         *cnt = nvbios_rd08(bios, therm + 3);
  53         return therm + nvbios_rd08(bios, therm + 1);
  54 }
  55
  56 static u16
  57 nvbios_therm_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *len)
  58 {
  59         u8 hdr, cnt;
  60         u16 therm = therm_table(bios, ver, &hdr, len, &cnt);
  61         if (therm && idx < cnt)
  62                 return therm + idx * *len;
  63         return 0x0000;
  64 }
  65
  66 int
  67 nvbios_therm_sensor_parse(struct nvkm_bios *bios,
  68                           enum nvbios_therm_domain domain,
  69                           struct nvbios_therm_sensor *sensor)
  70 {
  71         s8 thrs_section, sensor_section, offset;
  72         u8 ver, len, i;
  73         u16 entry;
  74
  75         /* we only support the core domain for now */
  76         if (domain != NVBIOS_THERM_DOMAIN_CORE)
  77                 return -EINVAL;
  78
  79         /* Read the entries from the table */
  80         thrs_section = 0;
  81         sensor_section = -1;
  82         i = 0;
  83         while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
  84                 s16 value = nvbios_rd16(bios, entry + 1);
  85
  86                 switch (nvbios_rd08(bios, entry + 0)) {
  87                 case 0x0:
  88                         thrs_section = value;
  89                         if (value > 0)
  90                                 return 0; /* we do not try to support ambient */
  91                         break;
  92                 case 0x01:
  93                         sensor_section++;
  94                         if (sensor_section == 0) {
  95                                 offset = ((s8) nvbios_rd08(bios, entry + 2)) / 2;
  96                                 sensor->offset_constant = offset;
  97                         }
  98                         break;
  99
 100                 case 0x04:
 101                         if (thrs_section == 0) {
 102                                 sensor->thrs_critical.temp = (value & 0xff0) >> 4;
 103                                 sensor->thrs_critical.hysteresis = value & 0xf;
 104                         }
 105                         break;
 106
 107                 case 0x07:
 108                         if (thrs_section == 0) {
 109                                 sensor->thrs_down_clock.temp = (value & 0xff0) >> 4;
 110                                 sensor->thrs_down_clock.hysteresis = value & 0xf;
 111                         }
 112                         break;
 113
 114                 case 0x08:
 115                         if (thrs_section == 0) {
 116                                 sensor->thrs_fan_boost.temp = (value & 0xff0) >> 4;
 117                                 sensor->thrs_fan_boost.hysteresis = value & 0xf;
 118                         }
 119                         break;
 120
 121                 case 0x10:
 122                         if (sensor_section == 0)
 123                                 sensor->offset_num = value;
 124                         break;
 125
 126                 case 0x11:
 127                         if (sensor_section == 0)
 128                                 sensor->offset_den = value;
 129                         break;
 130
 131                 case 0x12:
 132                         if (sensor_section == 0)
 133                                 sensor->slope_mult = value;
 134                         break;
 135
 136                 case 0x13:
 137                         if (sensor_section == 0)
 138                                 sensor->slope_div = value;
 139                         break;
 140                 case 0x32:
 141                         if (thrs_section == 0) {
 142                                 sensor->thrs_shutdown.temp = (value & 0xff0) >> 4;
 143                                 sensor->thrs_shutdown.hysteresis = value & 0xf;
 144                         }
 145                         break;
 146                 }
 147         }
 148
 149         return 0;
 150 }
 151
 152 int
 153 nvbios_therm_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
 154 {
 155         struct nvbios_therm_trip_point *cur_trip = NULL;
 156         u8 ver, len, i;
 157         u16 entry;
 158
 159         uint8_t duty_lut[] = { 0, 0, 25, 0, 40, 0, 50, 0,
 160                                 75, 0, 85, 0, 100, 0, 100, 0 };
 161
 162         i = 0;
 163         fan->nr_fan_trip = 0;
 164         fan->fan_mode = NVBIOS_THERM_FAN_OTHER;
 165         while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
 166                 s16 value = nvbios_rd16(bios, entry + 1);
 167
 168                 switch (nvbios_rd08(bios, entry + 0)) {
 169                 case 0x22:
 170                         fan->min_duty = value & 0xff;
 171                         fan->max_duty = (value & 0xff00) >> 8;
 172                         break;
 173                 case 0x24:
 174                         fan->nr_fan_trip++;
 175                         if (fan->fan_mode > NVBIOS_THERM_FAN_TRIP)
 176                                 fan->fan_mode = NVBIOS_THERM_FAN_TRIP;
 177                         cur_trip = &fan->trip[fan->nr_fan_trip - 1];
 178                         cur_trip->hysteresis = value & 0xf;
 179                         cur_trip->temp = (value & 0xff0) >> 4;
 180                         cur_trip->fan_duty = duty_lut[(value & 0xf000) >> 12];
 181                         break;
 182                 case 0x25:
 183                         cur_trip = &fan->trip[fan->nr_fan_trip - 1];
 184                         cur_trip->fan_duty = value;
 185                         break;
 186                 case 0x26:
 187                         if (!fan->pwm_freq)
 188                                 fan->pwm_freq = value;
 189                         break;
 190                 case 0x3b:
 191                         fan->bump_period = value;
 192                         break;
 193                 case 0x3c:
 194                         fan->slow_down_period = value;
 195                         break;
 196                 case 0x46:
 197                         if (fan->fan_mode > NVBIOS_THERM_FAN_LINEAR)
 198                                 fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
 199                         fan->linear_min_temp = nvbios_rd08(bios, entry + 1);
 200                         fan->linear_max_temp = nvbios_rd08(bios, entry + 2);
 201                         break;
 202                 }
 203         }
 204
 205         /* starting from fermi, fan management is always linear */
 206         if (bios->subdev.device->card_type >= NV_C0 &&
 207                 fan->fan_mode == NVBIOS_THERM_FAN_OTHER) {
 208                 fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
 209         }
 210
 211         return 0;
 212 }