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path: root/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c49
1 files changed, 49 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 000000000..070ff33f8
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/bit.c
@@ -0,0 +1,49 @@
+/*
+ * 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 <subdev/bios.h>
+#include <subdev/bios/bit.h>
+
+int
+bit_entry(struct nvkm_bios *bios, u8 id, struct bit_entry *bit)
+{
+ if (likely(bios->bit_offset)) {
+ u8 entries = nvbios_rd08(bios, bios->bit_offset + 10);
+ u32 entry = bios->bit_offset + 12;
+ while (entries--) {
+ if (nvbios_rd08(bios, entry + 0) == id) {
+ bit->id = nvbios_rd08(bios, entry + 0);
+ bit->version = nvbios_rd08(bios, entry + 1);
+ bit->length = nvbios_rd16(bios, entry + 2);
+ bit->offset = nvbios_rd16(bios, entry + 4);
+ return 0;
+ }
+
+ entry += nvbios_rd08(bios, bios->bit_offset + 9);
+ }
+
+ return -ENOENT;
+ }
+
+ return -EINVAL;
+}