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