drm/nouveau/ibus: add GP10B support

GP10B requires a specific initialization sequence due to the absence of
devinit.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/ibus.h

@@ -7,4 +7,5 @@ int gf117_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
 int gk104_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
 int gk20a_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
 int gm200_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
+int gp10b_ibus_new(struct nvkm_device *, int, struct nvkm_subdev **);
 #endif

drivers/gpu/drm/nouveau/nvkm/subdev/ibus/Kbuild

@@ -3,3 +3,4 @@ nvkm-y += nvkm/subdev/ibus/gf117.o
 nvkm-y += nvkm/subdev/ibus/gk104.o
 nvkm-y += nvkm/subdev/ibus/gk20a.o
 nvkm-y += nvkm/subdev/ibus/gm200.o
+nvkm-y += nvkm/subdev/ibus/gp10b.o

drivers/gpu/drm/nouveau/nvkm/subdev/ibus/gp10b.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2017, 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 <subdev/ibus.h>
+
+#include "priv.h"
+
+static int
+gp10b_ibus_init(struct nvkm_subdev *ibus)
+{
+	struct nvkm_device *device = ibus->device;
+
+	nvkm_wr32(device, 0x1200a8, 0x0);
+
+	/* init ring */
+	nvkm_wr32(device, 0x12004c, 0x4);
+	nvkm_wr32(device, 0x122204, 0x2);
+	nvkm_rd32(device, 0x122204);
+
+	/* timeout configuration */
+	nvkm_wr32(device, 0x009080, 0x800186a0);
+
+	return 0;
+}
+
+static const struct nvkm_subdev_func
+gp10b_ibus = {
+	.init = gp10b_ibus_init,
+	.intr = gk104_ibus_intr,
+};
+
+int
+gp10b_ibus_new(struct nvkm_device *device, int index,
+	       struct nvkm_subdev **pibus)
+{
+	struct nvkm_subdev *ibus;
+	if (!(ibus = *pibus = kzalloc(sizeof(*ibus), GFP_KERNEL)))
+		return -ENOMEM;
+	nvkm_subdev_ctor(&gp10b_ibus, device, index, ibus);
+	return 0;
+}