280 lines
7.5 KiB
C
280 lines
7.5 KiB
C
/*
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* Copyright 2012 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs
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* Martin Peres
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*/
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#include "priv.h"
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#include <subdev/bios/fan.h>
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#include <subdev/gpio.h>
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#include <subdev/timer.h>
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static int
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nvkm_fan_update(struct nvkm_fan *fan, bool immediate, int target)
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{
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struct nvkm_therm *therm = fan->parent;
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struct nvkm_subdev *subdev = &therm->subdev;
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struct nvkm_timer *tmr = subdev->device->timer;
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unsigned long flags;
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int ret = 0;
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int duty;
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/* update target fan speed, restricting to allowed range */
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spin_lock_irqsave(&fan->lock, flags);
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if (target < 0)
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target = fan->percent;
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target = max_t(u8, target, fan->bios.min_duty);
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target = min_t(u8, target, fan->bios.max_duty);
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if (fan->percent != target) {
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nvkm_debug(subdev, "FAN target: %d\n", target);
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fan->percent = target;
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}
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/* check that we're not already at the target duty cycle */
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duty = fan->get(therm);
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if (duty == target) {
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spin_unlock_irqrestore(&fan->lock, flags);
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return 0;
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}
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/* smooth out the fanspeed increase/decrease */
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if (!immediate && duty >= 0) {
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/* the constant "3" is a rough approximation taken from
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* nvidia's behaviour.
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* it is meant to bump the fan speed more incrementally
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*/
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if (duty < target)
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duty = min(duty + 3, target);
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else if (duty > target)
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duty = max(duty - 3, target);
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} else {
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duty = target;
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}
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nvkm_debug(subdev, "FAN update: %d\n", duty);
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ret = fan->set(therm, duty);
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if (ret) {
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spin_unlock_irqrestore(&fan->lock, flags);
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return ret;
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}
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/* fan speed updated, drop the fan lock before grabbing the
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* alarm-scheduling lock and risking a deadlock
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*/
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spin_unlock_irqrestore(&fan->lock, flags);
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/* schedule next fan update, if not at target speed already */
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if (target != duty) {
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u16 bump_period = fan->bios.bump_period;
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u16 slow_down_period = fan->bios.slow_down_period;
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u64 delay;
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if (duty > target)
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delay = slow_down_period;
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else if (duty == target)
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delay = min(bump_period, slow_down_period) ;
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else
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delay = bump_period;
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nvkm_timer_alarm(tmr, delay * 1000 * 1000, &fan->alarm);
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}
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return ret;
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}
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static void
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nvkm_fan_alarm(struct nvkm_alarm *alarm)
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{
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struct nvkm_fan *fan = container_of(alarm, struct nvkm_fan, alarm);
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nvkm_fan_update(fan, false, -1);
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}
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int
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nvkm_therm_fan_get(struct nvkm_therm *therm)
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{
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return therm->fan->get(therm);
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}
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int
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nvkm_therm_fan_set(struct nvkm_therm *therm, bool immediate, int percent)
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{
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return nvkm_fan_update(therm->fan, immediate, percent);
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}
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int
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nvkm_therm_fan_sense(struct nvkm_therm *therm)
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{
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struct nvkm_device *device = therm->subdev.device;
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struct nvkm_timer *tmr = device->timer;
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struct nvkm_gpio *gpio = device->gpio;
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u32 cycles, cur, prev;
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u64 start, end, tach;
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if (therm->func->fan_sense)
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return therm->func->fan_sense(therm);
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if (therm->fan->tach.func == DCB_GPIO_UNUSED)
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return -ENODEV;
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/* Time a complete rotation and extrapolate to RPM:
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* When the fan spins, it changes the value of GPIO FAN_SENSE.
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* We get 4 changes (0 -> 1 -> 0 -> 1) per complete rotation.
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*/
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start = nvkm_timer_read(tmr);
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prev = nvkm_gpio_get(gpio, 0, therm->fan->tach.func,
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therm->fan->tach.line);
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cycles = 0;
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do {
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usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
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cur = nvkm_gpio_get(gpio, 0, therm->fan->tach.func,
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therm->fan->tach.line);
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if (prev != cur) {
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if (!start)
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start = nvkm_timer_read(tmr);
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cycles++;
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prev = cur;
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}
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} while (cycles < 5 && nvkm_timer_read(tmr) - start < 250000000);
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end = nvkm_timer_read(tmr);
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if (cycles == 5) {
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tach = (u64)60000000000ULL;
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do_div(tach, (end - start));
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return tach;
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} else
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return 0;
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}
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int
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nvkm_therm_fan_user_get(struct nvkm_therm *therm)
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{
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return nvkm_therm_fan_get(therm);
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}
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int
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nvkm_therm_fan_user_set(struct nvkm_therm *therm, int percent)
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{
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if (therm->mode != NVKM_THERM_CTRL_MANUAL)
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return -EINVAL;
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return nvkm_therm_fan_set(therm, true, percent);
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}
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static void
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nvkm_therm_fan_set_defaults(struct nvkm_therm *therm)
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{
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therm->fan->bios.pwm_freq = 0;
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therm->fan->bios.min_duty = 0;
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therm->fan->bios.max_duty = 100;
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therm->fan->bios.bump_period = 500;
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therm->fan->bios.slow_down_period = 2000;
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therm->fan->bios.linear_min_temp = 40;
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therm->fan->bios.linear_max_temp = 85;
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}
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static void
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nvkm_therm_fan_safety_checks(struct nvkm_therm *therm)
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{
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if (therm->fan->bios.min_duty > 100)
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therm->fan->bios.min_duty = 100;
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if (therm->fan->bios.max_duty > 100)
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therm->fan->bios.max_duty = 100;
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if (therm->fan->bios.min_duty > therm->fan->bios.max_duty)
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therm->fan->bios.min_duty = therm->fan->bios.max_duty;
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}
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int
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nvkm_therm_fan_init(struct nvkm_therm *therm)
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{
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return 0;
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}
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int
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nvkm_therm_fan_fini(struct nvkm_therm *therm, bool suspend)
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{
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struct nvkm_timer *tmr = therm->subdev.device->timer;
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if (suspend)
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nvkm_timer_alarm(tmr, 0, &therm->fan->alarm);
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return 0;
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}
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int
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nvkm_therm_fan_ctor(struct nvkm_therm *therm)
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{
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struct nvkm_subdev *subdev = &therm->subdev;
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struct nvkm_device *device = subdev->device;
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struct nvkm_gpio *gpio = device->gpio;
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struct nvkm_bios *bios = device->bios;
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struct dcb_gpio_func func;
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int ret;
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/* attempt to locate a drivable fan, and determine control method */
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ret = nvkm_gpio_find(gpio, 0, DCB_GPIO_FAN, 0xff, &func);
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if (ret == 0) {
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/* FIXME: is this really the place to perform such checks ? */
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if (func.line != 16 && func.log[0] & DCB_GPIO_LOG_DIR_IN) {
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nvkm_debug(subdev, "GPIO_FAN is in input mode\n");
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ret = -EINVAL;
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} else {
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ret = nvkm_fanpwm_create(therm, &func);
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if (ret != 0)
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ret = nvkm_fantog_create(therm, &func);
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}
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}
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/* no controllable fan found, create a dummy fan module */
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if (ret != 0) {
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ret = nvkm_fannil_create(therm);
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if (ret)
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return ret;
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}
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nvkm_debug(subdev, "FAN control: %s\n", therm->fan->type);
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/* read the current speed, it is useful when resuming */
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therm->fan->percent = nvkm_therm_fan_get(therm);
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/* attempt to detect a tachometer connection */
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ret = nvkm_gpio_find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff,
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&therm->fan->tach);
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if (ret)
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therm->fan->tach.func = DCB_GPIO_UNUSED;
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/* initialise fan bump/slow update handling */
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therm->fan->parent = therm;
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nvkm_alarm_init(&therm->fan->alarm, nvkm_fan_alarm);
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spin_lock_init(&therm->fan->lock);
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/* other random init... */
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nvkm_therm_fan_set_defaults(therm);
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nvbios_perf_fan_parse(bios, &therm->fan->perf);
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if (!nvbios_fan_parse(bios, &therm->fan->bios)) {
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nvkm_debug(subdev, "parsing the fan table failed\n");
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if (nvbios_therm_fan_parse(bios, &therm->fan->bios))
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nvkm_error(subdev, "parsing both fan tables failed\n");
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}
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nvkm_therm_fan_safety_checks(therm);
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return 0;
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}
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