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