drm/gk20a/timer: initial implementation

A bit different from NVIDIA's RFC patch, but I want this now for GM107.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/Makefile

@@ -171,6 +171,7 @@ nouveau-y += core/subdev/therm/nva3.o
 nouveau-y += core/subdev/therm/nvd0.o
 nouveau-y += core/subdev/timer/base.o
 nouveau-y += core/subdev/timer/nv04.o
+nouveau-y += core/subdev/timer/gk20a.o
 nouveau-y += core/subdev/vm/base.o
 nouveau-y += core/subdev/vm/nv04.o
 nouveau-y += core/subdev/vm/nv41.o

drivers/gpu/drm/nouveau/core/include/subdev/timer.h

@@ -59,5 +59,6 @@ int nouveau_timer_create_(struct nouveau_object *, struct nouveau_engine *,
 			  struct nouveau_oclass *, int size, void **);
 
 extern struct nouveau_oclass nv04_timer_oclass;
+extern struct nouveau_oclass gk20a_timer_oclass;
 
 #endif

drivers/gpu/drm/nouveau/core/subdev/timer/gk20a.c

+/*
+ * 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 "nv04.h"
+
+static int
+gk20a_timer_init(struct nouveau_object *object)
+{
+	struct nv04_timer_priv *priv = (void *)object;
+	u32 hi = upper_32_bits(priv->suspend_time);
+	u32 lo = lower_32_bits(priv->suspend_time);
+	int ret;
+
+	ret = nouveau_timer_init(&priv->base);
+	if (ret)
+		return ret;
+
+	nv_debug(priv, "time low        : 0x%08x\n", lo);
+	nv_debug(priv, "time high       : 0x%08x\n", hi);
+
+	/* restore the time before suspend */
+	nv_wr32(priv, NV04_PTIMER_TIME_1, hi);
+	nv_wr32(priv, NV04_PTIMER_TIME_0, lo);
+	return 0;
+}
+
+struct nouveau_oclass
+gk20a_timer_oclass = {
+	.handle = NV_SUBDEV(TIMER, 0xff),
+	.ofuncs = &(struct nouveau_ofuncs) {
+		.ctor = nv04_timer_ctor,
+		.dtor = nv04_timer_dtor,
+		.init = gk20a_timer_init,
+		.fini = nv04_timer_fini,
+	}
+};

drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c

@@ -22,22 +22,7 @@
  * 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;
-	u64 suspend_time;
-};
+#include "nv04.h"
 
 static u64
 nv04_timer_read(struct nouveau_timer *ptimer)
@@ -142,35 +127,14 @@ nv04_timer_intr(struct nouveau_subdev *subdev)
 	}
 }
 
-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;
-	priv->base.alarm_cancel = nv04_timer_alarm_cancel;
-	priv->suspend_time = 0;
-
-	INIT_LIST_HEAD(&priv->alarms);
-	spin_lock_init(&priv->lock);
-	return 0;
-}
-
-static void
-nv04_timer_dtor(struct nouveau_object *object)
+int
+nv04_timer_fini(struct nouveau_object *object, bool suspend)
 {
 	struct nv04_timer_priv *priv = (void *)object;
-	return nouveau_timer_destroy(&priv->base);
+	if (suspend)
+		priv->suspend_time = nv04_timer_read(&priv->base);
+	nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
+	return nouveau_timer_fini(&priv->base, suspend);
 }
 
 static int
@@ -257,14 +221,35 @@ nv04_timer_init(struct nouveau_object *object)
 	return 0;
 }
 
-static int
-nv04_timer_fini(struct nouveau_object *object, bool suspend)
+void
+nv04_timer_dtor(struct nouveau_object *object)
 {
 	struct nv04_timer_priv *priv = (void *)object;
-	if (suspend)
-		priv->suspend_time = nv04_timer_read(&priv->base);
-	nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
-	return nouveau_timer_fini(&priv->base, suspend);
+	return nouveau_timer_destroy(&priv->base);
+}
+
+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;
+	priv->base.alarm_cancel = nv04_timer_alarm_cancel;
+	priv->suspend_time = 0;
+
+	INIT_LIST_HEAD(&priv->alarms);
+	spin_lock_init(&priv->lock);
+	return 0;
 }
 
 struct nouveau_oclass

drivers/gpu/drm/nouveau/core/subdev/timer/nv04.h

+#ifndef __NVKM_TIMER_NV04_H__
+#define __NVKM_TIMER_NV04_H__
+
+#include "priv.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;
+	u64 suspend_time;
+};
+
+int  nv04_timer_ctor(struct nouveau_object *, struct nouveau_object *,
+		     struct nouveau_oclass *, void *, u32,
+		     struct nouveau_object **);
+void nv04_timer_dtor(struct nouveau_object *);
+int  nv04_timer_fini(struct nouveau_object *, bool);
+
+#endif

drivers/gpu/drm/nouveau/core/subdev/timer/priv.h

+#ifndef __NVKM_TIMER_PRIV_H__
+#define __NVKM_TIMER_PRIV_H__
+
+#include <subdev/timer.h>
+
+#endif