drm/nouveau/bios: implement BIT 'U' table (and subtable) parsing in core

This will, in the near future, replace what's currently in the DRM
nouveau_bios.c code.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/Makefile

@@ -29,6 +29,7 @@ nouveau-y += core/subdev/bios/base.o
 nouveau-y += core/subdev/bios/bit.o
 nouveau-y += core/subdev/bios/conn.o
 nouveau-y += core/subdev/bios/dcb.o
+nouveau-y += core/subdev/bios/disp.o
 nouveau-y += core/subdev/bios/dp.o
 nouveau-y += core/subdev/bios/extdev.o
 nouveau-y += core/subdev/bios/gpio.o

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

+#ifndef __NVBIOS_DISP_H__
+#define __NVBIOS_DISP_H__
+
+u16 nvbios_disp_table(struct nouveau_bios *,
+		      u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *sub);
+
+struct nvbios_disp {
+	u16 data;
+};
+
+u16 nvbios_disp_entry(struct nouveau_bios *, u8 idx,
+		      u8 *ver, u8 *hdr__, u8 *sub);
+u16 nvbios_disp_parse(struct nouveau_bios *, u8 idx,
+		      u8 *ver, u8 *hdr__, u8 *sub,
+		      struct nvbios_disp *);
+
+struct nvbios_outp {
+	u16 type;
+	u16 mask;
+	u16 script[3];
+};
+
+u16 nvbios_outp_entry(struct nouveau_bios *, u8 idx,
+		      u8 *ver, u8 *hdr, u8 *cnt, u8 *len);
+u16 nvbios_outp_parse(struct nouveau_bios *, u8 idx,
+		      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		      struct nvbios_outp *);
+u16 nvbios_outp_match(struct nouveau_bios *, u16 type, u16 mask,
+		      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		      struct nvbios_outp *);
+
+
+struct nvbios_ocfg {
+	u16 match;
+	u16 clkcmp[2];
+};
+
+u16 nvbios_ocfg_entry(struct nouveau_bios *, u16 outp, u8 idx,
+		      u8 *ver, u8 *hdr, u8 *cnt, u8 *len);
+u16 nvbios_ocfg_parse(struct nouveau_bios *, u16 outp, u8 idx,
+		      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		      struct nvbios_ocfg *);
+u16 nvbios_ocfg_match(struct nouveau_bios *, u16 outp, u16 type,
+		      u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		      struct nvbios_ocfg *);
+u16 nvbios_oclk_match(struct nouveau_bios *, u16 cmp, u32 khz);
+
+#endif

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

+/*
+ * 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>
+#include <subdev/bios/disp.h>
+
+u16
+nvbios_disp_table(struct nouveau_bios *bios,
+		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *sub)
+{
+	struct bit_entry U;
+
+	if (!bit_entry(bios, 'U', &U)) {
+		if (U.version == 1) {
+			u16 data = nv_ro16(bios, U.offset);
+			if (data) {
+				*ver = nv_ro08(bios, data + 0x00);
+				switch (*ver) {
+				case 0x20:
+				case 0x21:
+					*hdr = nv_ro08(bios, data + 0x01);
+					*len = nv_ro08(bios, data + 0x02);
+					*cnt = nv_ro08(bios, data + 0x03);
+					*sub = nv_ro08(bios, data + 0x04);
+					return data;
+				default:
+					break;
+				}
+			}
+		}
+	}
+
+	return 0x0000;
+}
+
+u16
+nvbios_disp_entry(struct nouveau_bios *bios, u8 idx,
+		  u8 *ver, u8 *len, u8 *sub)
+{
+	u8  hdr, cnt;
+	u16 data = nvbios_disp_table(bios, ver, &hdr, &cnt, len, sub);
+	if (data && idx < cnt)
+		return data + hdr + (idx * *len);
+	*ver = 0x00;
+	return 0x0000;
+}
+
+u16
+nvbios_disp_parse(struct nouveau_bios *bios, u8 idx,
+		  u8 *ver, u8 *len, u8 *sub,
+		  struct nvbios_disp *info)
+{
+	u16 data = nvbios_disp_entry(bios, idx, ver, len, sub);
+	if (data && *len >= 2) {
+		info->data = nv_ro16(bios, data + 0);
+		return data;
+	}
+	return 0x0000;
+}
+
+u16
+nvbios_outp_entry(struct nouveau_bios *bios, u8 idx,
+		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
+{
+	struct nvbios_disp info;
+	u16 data = nvbios_disp_parse(bios, idx, ver, len, hdr, &info);
+	if (data) {
+		*cnt = nv_ro08(bios, info.data + 0x05);
+		*len = 0x06;
+		data = info.data;
+	}
+	return data;
+}
+
+u16
+nvbios_outp_parse(struct nouveau_bios *bios, u8 idx,
+		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		  struct nvbios_outp *info)
+{
+	u16 data = nvbios_outp_entry(bios, idx, ver, hdr, cnt, len);
+	if (data && *hdr >= 0x0a) {
+		info->type      = nv_ro16(bios, data + 0x00);
+		info->mask      = nv_ro32(bios, data + 0x02);
+		if (*ver <= 0x20) /* match any link */
+			info->mask |= 0x00c0;
+		info->script[0] = nv_ro16(bios, data + 0x06);
+		info->script[1] = nv_ro16(bios, data + 0x08);
+		info->script[2] = 0x0000;
+		if (*hdr >= 0x0c)
+			info->script[2] = nv_ro16(bios, data + 0x0a);
+		return data;
+	}
+	return 0x0000;
+}
+
+u16
+nvbios_outp_match(struct nouveau_bios *bios, u16 type, u16 mask,
+		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		  struct nvbios_outp *info)
+{
+	u16 data, idx = 0;
+	while ((data = nvbios_outp_parse(bios, idx++, ver, hdr, cnt, len, info)) || *ver) {
+		if (data && info->type == type) {
+			if ((info->mask & mask) == mask)
+				break;
+		}
+	}
+	return data;
+}
+
+u16
+nvbios_ocfg_entry(struct nouveau_bios *bios, u16 outp, u8 idx,
+		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
+{
+	if (idx < *cnt)
+		return outp + *hdr + (idx * *len);
+	return 0x0000;
+}
+
+u16
+nvbios_ocfg_parse(struct nouveau_bios *bios, u16 outp, u8 idx,
+		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		  struct nvbios_ocfg *info)
+{
+	u16 data = nvbios_ocfg_entry(bios, outp, idx, ver, hdr, cnt, len);
+	if (data) {
+		info->match     = nv_ro16(bios, data + 0x00);
+		info->clkcmp[0] = nv_ro16(bios, data + 0x02);
+		info->clkcmp[1] = nv_ro16(bios, data + 0x04);
+	}
+	return data;
+}
+
+u16
+nvbios_ocfg_match(struct nouveau_bios *bios, u16 outp, u16 type,
+		  u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
+		  struct nvbios_ocfg *info)
+{
+	u16 data, idx = 0;
+	while ((data = nvbios_ocfg_parse(bios, outp, idx++, ver, hdr, cnt, len, info))) {
+		if (info->match == type)
+			break;
+	}
+	return data;
+}
+
+u16
+nvbios_oclk_match(struct nouveau_bios *bios, u16 cmp, u32 khz)
+{
+	while (cmp) {
+		if (khz / 10 >= nv_ro16(bios, cmp + 0x00))
+			return  nv_ro16(bios, cmp + 0x02);
+		cmp += 0x04;
+	}
+	return 0x0000;
+}