[Nouveau] [RFC PATCH 3/5] nvbios: add parsing of BASE CLOCK table

[Karol Herbst]

this table is found mainly on kepler+ cards. Also some fermi cards have this table.
There are some fermi with a currupt one (strange version number), which is unusable though.

---
 drm/nouveau/include/nvkm/subdev/bios/baseclock.h | 23 +++++++
 drm/nouveau/nvkm/subdev/bios/Kbuild              |  1 +
 drm/nouveau/nvkm/subdev/bios/baseclock.c         | 79 ++++++++++++++++++++++++
 3 files changed, 103 insertions(+)
 create mode 100644 drm/nouveau/include/nvkm/subdev/bios/baseclock.h
 create mode 100644 drm/nouveau/nvkm/subdev/bios/baseclock.c

diff --git a/drm/nouveau/include/nvkm/subdev/bios/baseclock.h b/drm/nouveau/include/nvkm/subdev/bios/baseclock.h
new file mode 100644
index 0000000..07ee355
--- /dev/null
+++ b/drm/nouveau/include/nvkm/subdev/bios/baseclock.h
@@ -0,0 +1,23 @@
+#ifndef __NVBIOS_BASECLOCK_H__
+#define __NVBIOS_BASECLOCK_H__
+struct nvbios_baseclock_header {
+	u16 offset;
+
+	u8 version;
+	u8 hlen;
+	u8 ecount;
+	u8 elen;
+	u8 scount;
+	u8 slen;
+
+	u8 base_entry;
+	u8 boost_entry;
+	u8 tdp_entry;
+};
+struct nvbios_baseclock_entry {
+	u8  pstate;
+	u16 clock_mhz;
+};
+int nvbios_baseclock_parse(struct nvkm_bios *, struct nvbios_baseclock_header *);
+int nvbios_baseclock_get_entry(struct nvkm_bios *, struct nvbios_baseclock_header *h, u8 idx, struct nvbios_baseclock_entry *);
+#endif
diff --git a/drm/nouveau/nvkm/subdev/bios/Kbuild b/drm/nouveau/nvkm/subdev/bios/Kbuild
index 64730d5..a402755 100644
--- a/drm/nouveau/nvkm/subdev/bios/Kbuild
+++ b/drm/nouveau/nvkm/subdev/bios/Kbuild
@@ -1,4 +1,5 @@
 nvkm-y += nvkm/subdev/bios/base.o
+nvkm-y += nvkm/subdev/bios/baseclock.o
 nvkm-y += nvkm/subdev/bios/bit.o
 nvkm-y += nvkm/subdev/bios/boost.o
 nvkm-y += nvkm/subdev/bios/conn.o
diff --git a/drm/nouveau/nvkm/subdev/bios/baseclock.c b/drm/nouveau/nvkm/subdev/bios/baseclock.c
new file mode 100644
index 0000000..31609e0
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/bios/baseclock.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2015 Nouveau Community
+ *
+ * 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: Karol Herbst
+ */
+#include <subdev/bios.h>
+#include <subdev/bios/bit.h>
+#include <subdev/bios/baseclock.h>
+
+static u16
+nvbios_baseclock_offset(struct nvkm_bios *b)
+{
+	struct bit_entry bit_P;
+
+	if (!bit_entry(b, 'P', &bit_P)) {
+		if (bit_P.version == 2)
+			return nvbios_rd16(b, bit_P.offset + 0x38);
+	}
+
+	return 0x0000;
+}
+
+int nvbios_baseclock_parse(struct nvkm_bios *b, struct nvbios_baseclock_header *h)
+{
+	if (!h)
+		return -EINVAL;
+
+	h->offset = nvbios_baseclock_offset(b);
+	if (!h->offset)
+		return -ENODEV;
+
+	h->version = nvbios_rd08(b, h->offset);
+	switch (h->version) {
+	case 0x10:
+		h->hlen    = nvbios_rd08(b, h->offset + 0x1);
+		h->elen    = nvbios_rd08(b, h->offset + 0x2);
+		h->slen    = nvbios_rd08(b, h->offset + 0x3);
+		h->scount  = nvbios_rd08(b, h->offset + 0x4);
+		h->ecount  = nvbios_rd08(b, h->offset + 0x5);
+
+		h->base_entry  = nvbios_rd08(b, h->offset + 0x0f);
+		h->boost_entry = nvbios_rd08(b, h->offset + 0x10);
+		h->tdp_entry   = nvbios_rd08(b, h->offset + 0x11);
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+int nvbios_baseclock_get_entry(struct nvkm_bios *b, struct nvbios_baseclock_header *h, u8 idx, struct nvbios_baseclock_entry *e)
+{
+	u16 offset;
+
+	if (!e || !h)
+		return -EINVAL;
+
+	offset = h->offset + h->hlen + idx * (h->elen + (h->slen * h->scount));
+	e->pstate    = nvbios_rd08(b, offset);
+	e->clock_mhz = nvbios_rd16(b, offset + 0x5);
+	return 0;
+}
-- 
2.6.3