drm/nouveau/bios: add NPDE parsing

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

drivers/gpu/drm/nouveau/Makefile

@@ -44,6 +44,7 @@ nouveau-y += core/subdev/bios/i2c.o
 nouveau-y += core/subdev/bios/image.o
 nouveau-y += core/subdev/bios/init.o
 nouveau-y += core/subdev/bios/mxm.o
+nouveau-y += core/subdev/bios/npde.o
 nouveau-y += core/subdev/bios/pcir.o
 nouveau-y += core/subdev/bios/perf.o
 nouveau-y += core/subdev/bios/pll.o

drivers/gpu/drm/nouveau/core/include/subdev/bios/npde.h

+#ifndef __NVBIOS_NPDE_H__
+#define __NVBIOS_NPDE_H__
+
+struct nvbios_npdeT {
+	u32 image_size;
+	bool last;
+};
+
+u32 nvbios_npdeTe(struct nouveau_bios *, u32);
+u32 nvbios_npdeTp(struct nouveau_bios *, u32, struct nvbios_npdeT *);
+
+#endif

drivers/gpu/drm/nouveau/core/subdev/bios/npde.c

+/*
+ * 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/npde.h>
+#include <subdev/bios/pcir.h>
+
+u32
+nvbios_npdeTe(struct nouveau_bios *bios, u32 base)
+{
+	struct nvbios_pcirT pcir;
+	u8  ver; u16 hdr;
+	u32 data = nvbios_pcirTp(bios, base, &ver, &hdr, &pcir);
+	if (data = (data + hdr + 0x0f) & ~0x0f, data) {
+		switch (nv_ro32(bios, data + 0x00)) {
+		case 0x4544504e: /* NPDE */
+			break;
+		default:
+			nv_debug(bios, "%08x: NPDE signature (%08x) unknown\n",
+				 data, nv_ro32(bios, data + 0x00));
+			data = 0;
+			break;
+		}
+	}
+	return data;
+}
+
+u32
+nvbios_npdeTp(struct nouveau_bios *bios, u32 base, struct nvbios_npdeT *info)
+{
+	u32 data = nvbios_npdeTe(bios, base);
+	memset(info, 0x00, sizeof(*info));
+	if (data) {
+		info->image_size = nv_ro16(bios, data + 0x08) * 512;
+		info->last = nv_ro08(bios, data + 0x0a) & 0x80;
+	}
+	return data;
+}