cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fanpwm.c (3322B)

      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}