drm/nouveau/bios: parsing of some random table needed to bring up gr

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

drivers/gpu/drm/nouveau/Makefile

@@ -48,6 +48,7 @@ nouveau-y += core/subdev/bios/therm.o
 nouveau-y += core/subdev/bios/vmap.o
 nouveau-y += core/subdev/bios/volt.o
 nouveau-y += core/subdev/bios/xpio.o
+nouveau-y += core/subdev/bios/P0260.o
 nouveau-y += core/subdev/bus/hwsq.o
 nouveau-y += core/subdev/bus/nv04.o
 nouveau-y += core/subdev/bus/nv31.o

drivers/gpu/drm/nouveau/core/include/subdev/bios/P0260.h

+#ifndef __NVBIOS_P0260_H__
+#define __NVBIOS_P0260_H__
+
+u32 nvbios_P0260Te(struct nouveau_bios *,
+		   u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *xnr, u8 *xsz);
+
+struct nvbios_P0260E {
+	u32 data;
+};
+
+u32 nvbios_P0260Ee(struct nouveau_bios *, int idx, u8 *ver, u8 *hdr);
+u32 nvbios_P0260Ep(struct nouveau_bios *, int idx, u8 *ver, u8 *hdr,
+		   struct nvbios_P0260E *);
+
+struct nvbios_P0260X {
+	u32 data;
+};
+
+u32 nvbios_P0260Xe(struct nouveau_bios *, int idx, u8 *ver, u8 *hdr);
+u32 nvbios_P0260Xp(struct nouveau_bios *, int idx, u8 *ver, u8 *hdr,
+		   struct nvbios_P0260X *);
+
+#endif

drivers/gpu/drm/nouveau/core/subdev/bios/P0260.c

+/*
+ * Copyright 2013 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>
+#include <subdev/bios/ramcfg.h>
+#include <subdev/bios/P0260.h>
+
+u32
+nvbios_P0260Te(struct nouveau_bios *bios,
+	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *xnr, u8 *xsz)
+{
+	struct bit_entry bit_P;
+	u32 data = 0x00000000;
+
+	if (!bit_entry(bios, 'P', &bit_P)) {
+		if (bit_P.version == 2 && bit_P.length > 0x63)
+			data = nv_ro32(bios, bit_P.offset + 0x60);
+		if (data) {
+			*ver = nv_ro08(bios, data + 0);
+			switch (*ver) {
+			case 0x10:
+				*hdr = nv_ro08(bios, data + 1);
+				*cnt = nv_ro08(bios, data + 2);
+				*len = 4;
+				*xnr = nv_ro08(bios, data + 3);
+				*xsz = 4;
+				return data;
+			default:
+				break;
+			}
+		}
+	}
+
+	return 0x00000000;
+}
+
+u32
+nvbios_P0260Ee(struct nouveau_bios *bios, int idx, u8 *ver, u8 *len)
+{
+	u8  hdr, cnt, xnr, xsz;
+	u32 data = nvbios_P0260Te(bios, ver, &hdr, &cnt, len, &xnr, &xsz);
+	if (data && idx < cnt)
+		return data + hdr + (idx * *len);
+	return 0x00000000;
+}
+
+u32
+nvbios_P0260Ep(struct nouveau_bios *bios, int idx, u8 *ver, u8 *len,
+	       struct nvbios_P0260E *info)
+{
+	u32 data = nvbios_P0260Ee(bios, idx, ver, len);
+	memset(info, 0x00, sizeof(*info));
+	switch (!!data * *ver) {
+	case 0x10:
+		info->data = nv_ro32(bios, data);
+		return data;
+	default:
+		break;
+	}
+	return 0x00000000;
+}
+
+u32
+nvbios_P0260Xe(struct nouveau_bios *bios, int idx, u8 *ver, u8 *xsz)
+{
+	u8  hdr, cnt, len, xnr;
+	u32 data = nvbios_P0260Te(bios, ver, &hdr, &cnt, &len, &xnr, xsz);
+	if (data && idx < xnr)
+		return data + hdr + (cnt * len) + (idx * *xsz);
+	return 0x00000000;
+}
+
+u32
+nvbios_P0260Xp(struct nouveau_bios *bios, int idx, u8 *ver, u8 *hdr,
+	       struct nvbios_P0260X *info)
+{
+	u32 data = nvbios_P0260Xe(bios, idx, ver, hdr);
+	memset(info, 0x00, sizeof(*info));
+	switch (!!data * *ver) {
+	case 0x10:
+		info->data = nv_ro32(bios, data);
+		return data;
+	default:
+		break;
+	}
+	return 0x00000000;
+}