drm/nouveau/bios: split out shadow methods

We're about to need to be able to fetch additional chunks of data beyond
the primary bios image, which makes fetching a lot more complicated.

This splits out the verious shadowing routines to be nothing more than
very dumb "fetch this much data from this offset" routines, and leaves
the logic of what and how much to fetch in common code.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/image.c b/drivers/gpu/drm/nouveau/core/subdev/bios/image.c
new file mode 100644
index 000000000000..4b2120b1fab1
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/image.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2014 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 <bskeggs@redhat.com>
+ */
+
+#include <subdev/bios.h>
+#include <subdev/bios/image.h>
+
+static bool
+nvbios_imagen(struct nouveau_bios *bios, struct nvbios_image *image)
+{
+	u32 data;
+
+	switch ((data = nv_ro16(bios, image->base + 0x00))) {
+	case 0xaa55:
+		break;
+	default:
+		nv_debug(bios, "%08x: ROM signature (%04x) unknown\n",
+			 image->base, data);
+		return false;
+	}
+
+	image->size = nv_ro08(bios, image->base + 0x02) * 512;
+	image->type = 0x00;
+	image->last = true;
+	return true;
+}
+
+bool
+nvbios_image(struct nouveau_bios *bios, int idx, struct nvbios_image *image)
+{
+	memset(image, 0x00, sizeof(*image));
+	if (idx)
+		return false;
+	return nvbios_imagen(bios, image);
+}