drm/nouveau: remove symlinks, move core/ to nvkm/ (no code changes)

The symlinks were annoying some people, and they're not used anywhere
else in the kernel tree.  The include directory structure has been
changed so that symlinks aren't needed anymore.

NVKM has been moved from core/ to nvkm/ to make it more obvious as to
what the directory is for, and as some minor prep for when NVKM gets
split out into its own module (virt) at a later date.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 287 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 000000000000..3656d605168f
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
@@ -0,0 +1,287 @@
+/*
+ * 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 <core/object.h>
+#include <core/device.h>
+
+#include <subdev/gpio.h>
+#include <subdev/timer.h>
+
+#include <subdev/bios/fan.h>
+
+static int
+nouveau_fan_update(struct nouveau_fan *fan, bool immediate, int target)
+{
+	struct nouveau_therm *therm = fan->parent;
+	struct nouveau_therm_priv *priv = (void *)therm;
+	struct nouveau_timer *ptimer = nouveau_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
+nouveau_fan_alarm(struct nouveau_alarm *alarm)
+{
+	struct nouveau_fan *fan = container_of(alarm, struct nouveau_fan, alarm);
+	nouveau_fan_update(fan, false, -1);
+}
+
+int
+nouveau_therm_fan_get(struct nouveau_therm *therm)
+{
+	struct nouveau_therm_priv *priv = (void *)therm;
+	return priv->fan->get(therm);
+}
+
+int
+nouveau_therm_fan_set(struct nouveau_therm *therm, bool immediate, int percent)
+{
+	struct nouveau_therm_priv *priv = (void *)therm;
+	return nouveau_fan_update(priv->fan, immediate, percent);
+}
+
+int
+nouveau_therm_fan_sense(struct nouveau_therm *therm)
+{
+	struct nouveau_therm_priv *priv = (void *)therm;
+	struct nouveau_timer *ptimer = nouveau_timer(therm);
+	struct nouveau_gpio *gpio = nouveau_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
+nouveau_therm_fan_user_get(struct nouveau_therm *therm)
+{
+	return nouveau_therm_fan_get(therm);
+}
+
+int
+nouveau_therm_fan_user_set(struct nouveau_therm *therm, int percent)
+{
+	struct nouveau_therm_priv *priv = (void *)therm;
+
+	if (priv->mode != NOUVEAU_THERM_CTRL_MANUAL)
+		return -EINVAL;
+
+	return nouveau_therm_fan_set(therm, true, percent);
+}
+
+static void
+nouveau_therm_fan_set_defaults(struct nouveau_therm *therm)
+{
+	struct nouveau_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
+nouveau_therm_fan_safety_checks(struct nouveau_therm *therm)
+{
+	struct nouveau_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
+nouveau_therm_fan_init(struct nouveau_therm *therm)
+{
+	return 0;
+}
+
+int
+nouveau_therm_fan_fini(struct nouveau_therm *therm, bool suspend)
+{
+	struct nouveau_therm_priv *priv = (void *)therm;
+	struct nouveau_timer *ptimer = nouveau_timer(therm);
+
+	if (suspend)
+		ptimer->alarm_cancel(ptimer, &priv->fan->alarm);
+	return 0;
+}
+
+int
+nouveau_therm_fan_ctor(struct nouveau_therm *therm)
+{
+	struct nouveau_therm_priv *priv = (void *)therm;
+	struct nouveau_gpio *gpio = nouveau_gpio(therm);
+	struct nouveau_bios *bios = nouveau_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 = nouveau_fanpwm_create(therm, &func);
+			if (ret != 0)
+				ret = nouveau_fantog_create(therm, &func);
+		}
+	}
+
+	/* no controllable fan found, create a dummy fan module */
+	if (ret != 0) {
+		ret = nouveau_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 = nouveau_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;
+	nouveau_alarm_init(&priv->fan->alarm, nouveau_fan_alarm);
+	spin_lock_init(&priv->fan->lock);
+
+	/* other random init... */
+	nouveau_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");
+	}
+	nouveau_therm_fan_safety_checks(therm);
+	return 0;
+}