1 files changed, 279 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
new file mode 100644
index 000000000..f8fa43c8a
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
@@ -0,0 +1,279 @@
+/*
+ * 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_subdev *subdev = &therm->subdev;
+	struct nvkm_timer *tmr = subdev->device->timer;
+	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) {
+		nvkm_debug(subdev, "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;
+	}
+
+	nvkm_debug(subdev, "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 (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;
+
+		nvkm_timer_alarm(tmr, 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)
+{
+	return therm->fan->get(therm);
+}
+
+int
+nvkm_therm_fan_set(struct nvkm_therm *therm, bool immediate, int percent)
+{
+	return nvkm_fan_update(therm->fan, immediate, percent);
+}
+
+int
+nvkm_therm_fan_sense(struct nvkm_therm *therm)
+{
+	struct nvkm_device *device = therm->subdev.device;
+	struct nvkm_timer *tmr = device->timer;
+	struct nvkm_gpio *gpio = device->gpio;
+	u32 cycles, cur, prev;
+	u64 start, end, tach;
+
+	if (therm->func->fan_sense)
+		return therm->func->fan_sense(therm);
+
+	if (therm->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 = nvkm_timer_read(tmr);
+	prev = nvkm_gpio_get(gpio, 0, therm->fan->tach.func,
+				      therm->fan->tach.line);
+	cycles = 0;
+	do {
+		usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
+
+		cur = nvkm_gpio_get(gpio, 0, therm->fan->tach.func,
+					     therm->fan->tach.line);
+		if (prev != cur) {
+			if (!start)
+				start = nvkm_timer_read(tmr);
+			cycles++;
+			prev = cur;
+		}
+	} while (cycles < 5 && nvkm_timer_read(tmr) - start < 250000000);
+	end = nvkm_timer_read(tmr);
+
+	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)
+{
+	if (therm->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)
+{
+	therm->fan->bios.pwm_freq = 0;
+	therm->fan->bios.min_duty = 0;
+	therm->fan->bios.max_duty = 100;
+	therm->fan->bios.bump_period = 500;
+	therm->fan->bios.slow_down_period = 2000;
+	therm->fan->bios.linear_min_temp = 40;
+	therm->fan->bios.linear_max_temp = 85;
+}
+
+static void
+nvkm_therm_fan_safety_checks(struct nvkm_therm *therm)
+{
+	if (therm->fan->bios.min_duty > 100)
+		therm->fan->bios.min_duty = 100;
+	if (therm->fan->bios.max_duty > 100)
+		therm->fan->bios.max_duty = 100;
+
+	if (therm->fan->bios.min_duty > therm->fan->bios.max_duty)
+		therm->fan->bios.min_duty = therm->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_timer *tmr = therm->subdev.device->timer;
+	if (suspend)
+		nvkm_timer_alarm(tmr, 0, &therm->fan->alarm);
+	return 0;
+}
+
+int
+nvkm_therm_fan_ctor(struct nvkm_therm *therm)
+{
+	struct nvkm_subdev *subdev = &therm->subdev;
+	struct nvkm_device *device = subdev->device;
+	struct nvkm_gpio *gpio = device->gpio;
+	struct nvkm_bios *bios = device->bios;
+	struct dcb_gpio_func func;
+	int ret;
+
+	/* attempt to locate a drivable fan, and determine control method */
+	ret = nvkm_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) {
+			nvkm_debug(subdev, "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;
+	}
+
+	nvkm_debug(subdev, "FAN control: %s\n", therm->fan->type);
+
+	/* read the current speed, it is useful when resuming */
+	therm->fan->percent = nvkm_therm_fan_get(therm);
+
+	/* attempt to detect a tachometer connection */
+	ret = nvkm_gpio_find(gpio, 0, DCB_GPIO_FAN_SENSE, 0xff,
+			     &therm->fan->tach);
+	if (ret)
+		therm->fan->tach.func = DCB_GPIO_UNUSED;
+
+	/* initialise fan bump/slow update handling */
+	therm->fan->parent = therm;
+	nvkm_alarm_init(&therm->fan->alarm, nvkm_fan_alarm);
+	spin_lock_init(&therm->fan->lock);
+
+	/* other random init... */
+	nvkm_therm_fan_set_defaults(therm);
+	nvbios_perf_fan_parse(bios, &therm->fan->perf);
+	if (!nvbios_fan_parse(bios, &therm->fan->bios)) {
+		nvkm_debug(subdev, "parsing the fan table failed\n");
+		if (nvbios_therm_fan_parse(bios, &therm->fan->bios))
+			nvkm_error(subdev, "parsing both fan tables failed\n");
+	}
+	nvkm_therm_fan_safety_checks(therm);
+	return 0;
+}