Add support for initializing the priv ring of GK20A. This is done by the
BIOS on desktop GPUs, but needs to be done by hand on Tegra.
Signed-off-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
---
drivers/gpu/drm/nouveau/Makefile | 1 +
drivers/gpu/drm/nouveau/core/include/subdev/ibus.h | 1 +
drivers/gpu/drm/nouveau/core/subdev/ibus/gk20a.c | 103 +++++++++++++++++++++
3 files changed, 105 insertions(+)
create mode 100644 drivers/gpu/drm/nouveau/core/subdev/ibus/gk20a.c
diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index b7d216264775..bc5fb24630e6 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -136,6 +136,7 @@ nouveau-y += core/subdev/i2c/nv94.o
nouveau-y += core/subdev/i2c/nvd0.o
nouveau-y += core/subdev/ibus/nvc0.o
nouveau-y += core/subdev/ibus/nve0.o
+nouveau-y += core/subdev/ibus/gk20a.o
nouveau-y += core/subdev/instmem/base.o
nouveau-y += core/subdev/instmem/nv04.o
nouveau-y += core/subdev/instmem/nv40.o
diff --git a/drivers/gpu/drm/nouveau/core/include/subdev/ibus.h b/drivers/gpu/drm/nouveau/core/include/subdev/ibus.h
index 88814f159d89..31df634c0fdc 100644
--- a/drivers/gpu/drm/nouveau/core/include/subdev/ibus.h
+++ b/drivers/gpu/drm/nouveau/core/include/subdev/ibus.h
@@ -30,5 +30,6 @@ nouveau_ibus(void *obj)
extern struct nouveau_oclass nvc0_ibus_oclass;
extern struct nouveau_oclass nve0_ibus_oclass;
+extern struct nouveau_oclass gk20a_ibus_oclass;
#endif
diff --git a/drivers/gpu/drm/nouveau/core/subdev/ibus/gk20a.c b/drivers/gpu/drm/nouveau/core/subdev/ibus/gk20a.c
new file mode 100644
index 000000000000..245f0ebaa6af
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/ibus/gk20a.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2014, 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 <subdev/timer.h>
+
+struct gk20a_ibus_priv {
+ struct nouveau_ibus base;
+};
+
+static void
+gk20a_ibus_init_priv_ring(struct gk20a_ibus_priv *priv)
+{
+ nv_mask(priv, 0x137250, 0x3f, 0);
+
+ nv_mask(priv, 0x000200, 0x20, 0);
+ usleep_range(20, 30);
+ nv_mask(priv, 0x000200, 0x20, 0x20);
+
+ nv_wr32(priv, 0x12004c, 0x4);
+ nv_wr32(priv, 0x122204, 0x2);
+ nv_rd32(priv, 0x122204);
+}
+
+static void
+gk20a_ibus_intr(struct nouveau_subdev *subdev)
+{
+ struct gk20a_ibus_priv *priv = (void *)subdev;
+ u32 status0 = nv_rd32(priv, 0x120058);
+
+ if (status0 & 0x7) {
+ nv_debug(priv, "resetting priv ring\n");
+ gk20a_ibus_init_priv_ring(priv);
+ }
+
+ /* Acknowledge interrupt */
+ nv_mask(priv, 0x12004c, 0x2, 0x2);
+
+ if (!nv_wait(subdev, 0x12004c, 0x3f, 0x00))
+ nv_warn(priv, "timeout waiting for ringmaster ack\n");
+}
+
+static int
+gk20a_ibus_init(struct nouveau_object *object)
+{
+ struct gk20a_ibus_priv *priv = (void *)object;
+ int ret;
+
+ ret = _nouveau_ibus_init(object);
+ if (ret)
+ return ret;
+
+ gk20a_ibus_init_priv_ring(priv);
+
+ return 0;
+}
+
+static int
+gk20a_ibus_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
+ struct nouveau_oclass *oclass, void *data, u32 size,
+ struct nouveau_object **pobject)
+{
+ struct gk20a_ibus_priv *priv;
+ int ret;
+
+ ret = nouveau_ibus_create(parent, engine, oclass, &priv);
+ *pobject = nv_object(priv);
+ if (ret)
+ return ret;
+
+ nv_subdev(priv)->intr = gk20a_ibus_intr;
+ return 0;
+}
+
+struct nouveau_oclass
+gk20a_ibus_oclass = {
+ .handle = NV_SUBDEV(IBUS, 0xea),
+ .ofuncs = &(struct nouveau_ofuncs) {
+ .ctor = gk20a_ibus_ctor,
+ .dtor = _nouveau_ibus_dtor,
+ .init = gk20a_ibus_init,
+ .fini = _nouveau_ibus_fini,
+ },
+};
--
1.9.2
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