AMD hudson and yangtze: add IMC fan control support

imc_reg_init: init fan control related registers.
enable_imc_thermal_zone: AGESA does not enable thermal zone. We enable
it here.

Change-Id: I93c729982d78b6d2c7c20bcb1a3e27a7dd0eba91
Signed-off-by: WANG Siyuan <SiYuan.Wang@amd.com>
Signed-off-by: WANG Siyuan <wangsiyuanbuaa@gmail.com>
Reviewed-on: http://review.coreboot.org/4300
Tested-by: build bot (Jenkins)
Reviewed-by: Rudolf Marek <r.marek@assembler.cz>
diff --git a/src/southbridge/amd/agesa/hudson/imc.h b/src/southbridge/amd/agesa/hudson/imc.h
new file mode 100644
index 0000000..d348319
--- /dev/null
+++ b/src/southbridge/amd/agesa/hudson/imc.h
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 Advanced Micro Devices, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef HUDSON_IMC_H
+#define HUDSON_IMC_H
+
+void imc_reg_init(void);
+void enable_imc_thermal_zone(void);
+
+#endif