1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/vpstate.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/vpstate.c
new file mode 100644
index 000000000000..f199270163d2
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/vpstate.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2016 Karol Herbst
+ *
+ * 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/vpstate.h>
+
+static u32
+nvbios_vpstate_offset(struct nvkm_bios *b)
+{
+	struct bit_entry bit_P;
+
+	if (!bit_entry(b, 'P', &bit_P)) {
+		if (bit_P.version == 2)
+			return nvbios_rd32(b, bit_P.offset + 0x38);
+	}
+
+	return 0x0000;
+}
+
+int
+nvbios_vpstate_parse(struct nvkm_bios *b, struct nvbios_vpstate_header *h)
+{
+	if (!h)
+		return -EINVAL;
+
+	h->offset = nvbios_vpstate_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_id  = nvbios_rd08(b, h->offset + 0x0f);
+		h->boost_id = nvbios_rd08(b, h->offset + 0x10);
+		h->tdp_id   = nvbios_rd08(b, h->offset + 0x11);
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+int
+nvbios_vpstate_entry(struct nvkm_bios *b, struct nvbios_vpstate_header *h,
+		     u8 idx, struct nvbios_vpstate_entry *e)
+{
+	u32 offset;
+
+	if (!e || !h || idx > h->ecount)
+		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;
+}