1 files changed, 52 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c
new file mode 100644
index 000000000000..1d03a3f2b2d2
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c
@@ -0,0 +1,52 @@
+/*
+ * 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 "core/object.h"
+
+#include "subdev/bios.h"
+#include "subdev/bios/bit.h"
+
+int
+bit_entry(struct nouveau_bios *bios, u8 id, struct bit_entry *bit)
+{
+	if (likely(bios->bit_offset)) {
+		u8  entries = nv_ro08(bios, bios->bit_offset + 10);
+		u32 entry   = bios->bit_offset + 12;
+		while (entries--) {
+			if (nv_ro08(bios, entry + 0) == id) {
+				bit->id      = nv_ro08(bios, entry + 0);
+				bit->version = nv_ro08(bios, entry + 1);
+				bit->length  = nv_ro16(bios, entry + 2);
+				bit->offset  = nv_ro16(bios, entry + 4);
+				return 0;
+			}
+
+			entry += nv_ro08(bios, bios->bit_offset + 9);
+		}
+
+		return -ENOENT;
+	}
+
+	return -EINVAL;
+}