drm/nouveau/fifo: add GM20B fifo

GM20B has a 512-channels FIFO similar to GK104.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h

@@ -117,6 +117,7 @@ extern struct nvkm_oclass *gk104_fifo_oclass;
 extern struct nvkm_oclass *gk20a_fifo_oclass;
 extern struct nvkm_oclass *gk208_fifo_oclass;
 extern struct nvkm_oclass *gm204_fifo_oclass;
+extern struct nvkm_oclass *gm20b_fifo_oclass;
 
 int  nvkm_fifo_uevent_ctor(struct nvkm_object *, void *, u32,
 			   struct nvkm_notify *);

drivers/gpu/drm/nouveau/nvkm/engine/fifo/Kbuild

@@ -10,3 +10,4 @@ nvkm-y += nvkm/engine/fifo/gk104.o
 nvkm-y += nvkm/engine/fifo/gk20a.o
 nvkm-y += nvkm/engine/fifo/gk208.o
 nvkm-y += nvkm/engine/fifo/gm204.o
+nvkm-y += nvkm/engine/fifo/gm20b.o

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.h

@@ -15,4 +15,8 @@ struct gk104_fifo_impl {
 };
 
 extern struct nvkm_ofuncs gk104_fifo_chan_ofuncs;
+
+int  gm204_fifo_ctor(struct nvkm_object *, struct nvkm_object *,
+		    struct nvkm_oclass *, void *, u32,
+		    struct nvkm_object **);
 #endif

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gm204.c

@@ -31,7 +31,7 @@ gm204_fifo_sclass[] = {
 	{}
 };
 
-static int
+int
 gm204_fifo_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 		struct nvkm_oclass *oclass, void *data, u32 size,
 		struct nvkm_object **pobject)

drivers/gpu/drm/nouveau/nvkm/engine/fifo/gm20b.c

+/*
+ * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved.
+ *
+ * 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+#include "gk104.h"
+
+struct nvkm_oclass *
+gm20b_fifo_oclass = &(struct gk104_fifo_impl) {
+	.base.handle = NV_ENGINE(FIFO, 0x2b),
+	.base.ofuncs = &(struct nvkm_ofuncs) {
+		.ctor = gm204_fifo_ctor,
+		.dtor = gk104_fifo_dtor,
+		.init = gk104_fifo_init,
+		.fini = gk104_fifo_fini,
+	},
+	.channels = 512,
+}.base;