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