1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fuse/nv50.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fuse/nv50.c
new file mode 100644
index 000000000..2505e8e1c
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fuse/nv50.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2014 Martin Peres
+ *
+ * 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: Martin Peres
+ */
+#include "priv.h"
+
+static u32
+nv50_fuse_read(struct nvkm_fuse *fuse, u32 addr)
+{
+	struct nvkm_device *device = fuse->subdev.device;
+	unsigned long flags;
+	u32 fuse_enable, val;
+
+	/* racy if another part of nvkm start writing to this reg */
+	spin_lock_irqsave(&fuse->lock, flags);
+	fuse_enable = nvkm_mask(device, 0x001084, 0x800, 0x800);
+	val = nvkm_rd32(device, 0x021000 + addr);
+	nvkm_wr32(device, 0x001084, fuse_enable);
+	spin_unlock_irqrestore(&fuse->lock, flags);
+	return val;
+}
+
+static const struct nvkm_fuse_func
+nv50_fuse = {
+	.read = &nv50_fuse_read,
+};
+
+int
+nv50_fuse_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
+	      struct nvkm_fuse **pfuse)
+{
+	return nvkm_fuse_new_(&nv50_fuse, device, type, inst, pfuse);
+}