drivers/gpu/drm/nouveau/nvkm/subdev/therm/gp100.c

   1 /*
   2  * Copyright 2017 Rhys Kidd
   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: Rhys Kidd
  23  */
  24 #include "priv.h"
  25
  26 static int
  27 gp100_temp_get(struct nvkm_therm *therm)
  28 {
  29         struct nvkm_device *device = therm->subdev.device;
  30         struct nvkm_subdev *subdev = &therm->subdev;
  31         u32 tsensor = nvkm_rd32(device, 0x020460);
  32         u32 inttemp = (tsensor & 0x0001fff8);
  33
  34         /* device SHADOWed */
  35         if (tsensor & 0x40000000)
  36                 nvkm_trace(subdev, "reading temperature from SHADOWed sensor\n");
  37
  38         /* device valid */
  39         if (tsensor & 0x20000000)
  40                 return (inttemp >> 8);
  41         else
  42                 return -ENODEV;
  43 }
  44
  45 static const struct nvkm_therm_func
  46 gp100_therm = {
  47         .temp_get = gp100_temp_get,
  48         .program_alarms = nvkm_therm_program_alarms_polling,
  49 };
  50
  51 int
  52 gp100_therm_new(struct nvkm_device *device, int index,
  53                 struct nvkm_therm **ptherm)
  54 {
  55         return nvkm_therm_new_(&gp100_therm, device, index, ptherm);
  56 }