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

   1 /*
   2  * Copyright 2012 Red Hat Inc.
   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: Ben Skeggs
  23  *          Martin Peres
  24  */
  25 #include "priv.h"
  26
  27 #include <core/device.h>
  28 #include <core/option.h>
  29 #include <subdev/bios.h>
  30 #include <subdev/bios/fan.h>
  31 #include <subdev/gpio.h>
  32
  33 struct nvkm_fanpwm_priv {
  34         struct nvkm_fan base;
  35         struct dcb_gpio_func func;
  36 };
  37
  38 static int
  39 nvkm_fanpwm_get(struct nvkm_therm *therm)
  40 {
  41         struct nvkm_therm_priv *tpriv = (void *)therm;
  42         struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan;
  43         struct nvkm_gpio *gpio = nvkm_gpio(therm);
  44         int card_type = nv_device(therm)->card_type;
  45         u32 divs, duty;
  46         int ret;
  47
  48         ret = therm->pwm_get(therm, priv->func.line, &divs, &duty);
  49         if (ret == 0 && divs) {
  50                 divs = max(divs, duty);
  51                 if (card_type <= NV_40 || (priv->func.log[0] & 1))
  52                         duty = divs - duty;
  53                 return (duty * 100) / divs;
  54         }
  55
  56         return gpio->get(gpio, 0, priv->func.func, priv->func.line) * 100;
  57 }
  58
  59 static int
  60 nvkm_fanpwm_set(struct nvkm_therm *therm, int percent)
  61 {
  62         struct nvkm_therm_priv *tpriv = (void *)therm;
  63         struct nvkm_fanpwm_priv *priv = (void *)tpriv->fan;
  64         int card_type = nv_device(therm)->card_type;
  65         u32 divs, duty;
  66         int ret;
  67
  68         divs = priv->base.perf.pwm_divisor;
  69         if (priv->base.bios.pwm_freq) {
  70                 divs = 1;
  71                 if (therm->pwm_clock)
  72                         divs = therm->pwm_clock(therm, priv->func.line);
  73                 divs /= priv->base.bios.pwm_freq;
  74         }
  75
  76         duty = ((divs * percent) + 99) / 100;
  77         if (card_type <= NV_40 || (priv->func.log[0] & 1))
  78                 duty = divs - duty;
  79
  80         ret = therm->pwm_set(therm, priv->func.line, divs, duty);
  81         if (ret == 0)
  82                 ret = therm->pwm_ctrl(therm, priv->func.line, true);
  83         return ret;
  84 }
  85
  86 int
  87 nvkm_fanpwm_create(struct nvkm_therm *therm, struct dcb_gpio_func *func)
  88 {
  89         struct nvkm_device *device = nv_device(therm);
  90         struct nvkm_therm_priv *tpriv = (void *)therm;
  91         struct nvkm_bios *bios = nvkm_bios(therm);
  92         struct nvkm_fanpwm_priv *priv;
  93         struct nvbios_therm_fan fan;
  94         u32 divs, duty;
  95
  96         nvbios_fan_parse(bios, &fan);
  97
  98         if (!nvkm_boolopt(device->cfgopt, "NvFanPWM", func->param) ||
  99             !therm->pwm_ctrl || fan.type == NVBIOS_THERM_FAN_TOGGLE ||
 100              therm->pwm_get(therm, func->line, &divs, &duty) == -ENODEV)
 101                 return -ENODEV;
 102
 103         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 104         tpriv->fan = &priv->base;
 105         if (!priv)
 106                 return -ENOMEM;
 107
 108         priv->base.type = "PWM";
 109         priv->base.get = nvkm_fanpwm_get;
 110         priv->base.set = nvkm_fanpwm_set;
 111         priv->func = *func;
 112         return 0;
 113 }