1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c b/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c
new file mode 100644
index 0000000..9469b82
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c
@@ -0,0 +1,254 @@
+/*
+ * 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
+ */
+
+#include <subdev/timer.h>
+
+#define NV04_PTIMER_INTR_0      0x009100
+#define NV04_PTIMER_INTR_EN_0   0x009140
+#define NV04_PTIMER_NUMERATOR   0x009200
+#define NV04_PTIMER_DENOMINATOR 0x009210
+#define NV04_PTIMER_TIME_0      0x009400
+#define NV04_PTIMER_TIME_1      0x009410
+#define NV04_PTIMER_ALARM_0     0x009420
+
+struct nv04_timer_priv {
+	struct nouveau_timer base;
+	struct list_head alarms;
+	spinlock_t lock;
+};
+
+static u64
+nv04_timer_read(struct nouveau_timer *ptimer)
+{
+	struct nv04_timer_priv *priv = (void *)ptimer;
+	u32 hi, lo;
+
+	do {
+		hi = nv_rd32(priv, NV04_PTIMER_TIME_1);
+		lo = nv_rd32(priv, NV04_PTIMER_TIME_0);
+	} while (hi != nv_rd32(priv, NV04_PTIMER_TIME_1));
+
+	return ((u64)hi << 32 | lo);
+}
+
+static void
+nv04_timer_alarm_trigger(struct nouveau_timer *ptimer)
+{
+	struct nv04_timer_priv *priv = (void *)ptimer;
+	struct nouveau_alarm *alarm, *atemp;
+	unsigned long flags;
+	LIST_HEAD(exec);
+
+	/* move any due alarms off the pending list */
+	spin_lock_irqsave(&priv->lock, flags);
+	list_for_each_entry_safe(alarm, atemp, &priv->alarms, head) {
+		if (alarm->timestamp <= ptimer->read(ptimer))
+			list_move_tail(&alarm->head, &exec);
+	}
+
+	/* reschedule interrupt for next alarm time */
+	if (!list_empty(&priv->alarms)) {
+		alarm = list_first_entry(&priv->alarms, typeof(*alarm), head);
+		nv_wr32(priv, NV04_PTIMER_ALARM_0, alarm->timestamp);
+		nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000001);
+	} else {
+		nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	/* execute any pending alarm handlers */
+	list_for_each_entry_safe(alarm, atemp, &exec, head) {
+		list_del_init(&alarm->head);
+		alarm->func(alarm);
+	}
+}
+
+static void
+nv04_timer_alarm(struct nouveau_timer *ptimer, u64 time,
+		 struct nouveau_alarm *alarm)
+{
+	struct nv04_timer_priv *priv = (void *)ptimer;
+	struct nouveau_alarm *list;
+	unsigned long flags;
+
+	alarm->timestamp = ptimer->read(ptimer) + time;
+
+	/* append new alarm to list, in soonest-alarm-first order */
+	spin_lock_irqsave(&priv->lock, flags);
+	if (!time) {
+		if (!list_empty(&alarm->head))
+			list_del(&alarm->head);
+	} else {
+		list_for_each_entry(list, &priv->alarms, head) {
+			if (list->timestamp > alarm->timestamp)
+				break;
+		}
+		list_add_tail(&alarm->head, &list->head);
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	/* process pending alarms */
+	nv04_timer_alarm_trigger(ptimer);
+}
+
+static void
+nv04_timer_intr(struct nouveau_subdev *subdev)
+{
+	struct nv04_timer_priv *priv = (void *)subdev;
+	u32 stat = nv_rd32(priv, NV04_PTIMER_INTR_0);
+
+	if (stat & 0x00000001) {
+		nv04_timer_alarm_trigger(&priv->base);
+		nv_wr32(priv, NV04_PTIMER_INTR_0, 0x00000001);
+		stat &= ~0x00000001;
+	}
+
+	if (stat) {
+		nv_error(priv, "unknown stat 0x%08x\n", stat);
+		nv_wr32(priv, NV04_PTIMER_INTR_0, stat);
+	}
+}
+
+static int
+nv04_timer_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
+		struct nouveau_oclass *oclass, void *data, u32 size,
+		struct nouveau_object **pobject)
+{
+	struct nv04_timer_priv *priv;
+	int ret;
+
+	ret = nouveau_timer_create(parent, engine, oclass, &priv);
+	*pobject = nv_object(priv);
+	if (ret)
+		return ret;
+
+	priv->base.base.intr = nv04_timer_intr;
+	priv->base.read = nv04_timer_read;
+	priv->base.alarm = nv04_timer_alarm;
+
+	INIT_LIST_HEAD(&priv->alarms);
+	spin_lock_init(&priv->lock);
+	return 0;
+}
+
+static void
+nv04_timer_dtor(struct nouveau_object *object)
+{
+	struct nv04_timer_priv *priv = (void *)object;
+	return nouveau_timer_destroy(&priv->base);
+}
+
+static int
+nv04_timer_init(struct nouveau_object *object)
+{
+	struct nouveau_device *device = nv_device(object);
+	struct nv04_timer_priv *priv = (void *)object;
+	u32 m = 1, f, n, d;
+	int ret;
+
+	ret = nouveau_timer_init(&priv->base);
+	if (ret)
+		return ret;
+
+	/* aim for 31.25MHz, which gives us nanosecond timestamps */
+	d = 1000000 / 32;
+
+	/* determine base clock for timer source */
+#if 0 /*XXX*/
+	if (device->chipset < 0x40) {
+		n = nouveau_hw_get_clock(device, PLL_CORE);
+	} else
+#endif
+	if (device->chipset <= 0x40) {
+		/*XXX: figure this out */
+		f = -1;
+		n = 0;
+	} else {
+		f = device->crystal;
+		n = f;
+		while (n < (d * 2)) {
+			n += (n / m);
+			m++;
+		}
+
+		nv_wr32(priv, 0x009220, m - 1);
+	}
+
+	if (!n) {
+		nv_warn(priv, "unknown input clock freq\n");
+		if (!nv_rd32(priv, NV04_PTIMER_NUMERATOR) ||
+		    !nv_rd32(priv, NV04_PTIMER_DENOMINATOR)) {
+			nv_wr32(priv, NV04_PTIMER_NUMERATOR, 1);
+			nv_wr32(priv, NV04_PTIMER_DENOMINATOR, 1);
+		}
+		return 0;
+	}
+
+	/* reduce ratio to acceptable values */
+	while (((n % 5) == 0) && ((d % 5) == 0)) {
+		n /= 5;
+		d /= 5;
+	}
+
+	while (((n % 2) == 0) && ((d % 2) == 0)) {
+		n /= 2;
+		d /= 2;
+	}
+
+	while (n > 0xffff || d > 0xffff) {
+		n >>= 1;
+		d >>= 1;
+	}
+
+	nv_debug(priv, "input frequency : %dHz\n", f);
+	nv_debug(priv, "input multiplier: %d\n", m);
+	nv_debug(priv, "numerator       : 0x%08x\n", n);
+	nv_debug(priv, "denominator     : 0x%08x\n", d);
+	nv_debug(priv, "timer frequency : %dHz\n", (f * m) * d / n);
+
+	nv_wr32(priv, NV04_PTIMER_NUMERATOR, n);
+	nv_wr32(priv, NV04_PTIMER_DENOMINATOR, d);
+	nv_wr32(priv, NV04_PTIMER_INTR_0, 0xffffffff);
+	nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
+	return 0;
+}
+
+static int
+nv04_timer_fini(struct nouveau_object *object, bool suspend)
+{
+	struct nv04_timer_priv *priv = (void *)object;
+	nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
+	return nouveau_timer_fini(&priv->base, suspend);
+}
+
+struct nouveau_oclass
+nv04_timer_oclass = {
+	.handle = NV_SUBDEV(TIMER, 0x04),
+	.ofuncs = &(struct nouveau_ofuncs) {
+		.ctor = nv04_timer_ctor,
+		.dtor = nv04_timer_dtor,
+		.init = nv04_timer_init,
+		.fini = nv04_timer_fini,
+	}
+};