soc/intel/apollolake: Add utility functions for global reset

Apollolake defines Global Reset where Host, TXE and PMC are reset.
During boot we may need to trigger a global reset as part of platform
initialization (or for error handling). Add functions to trigger
global reset, enable/disable it and lock global reset bit.

BUG=chrome-os-partner:54149
BRANCH=none
TEST=none

Change-Id: I84296cd1560a0740f33ef6b488f15f99d397998d
Signed-off-by: Andrey Petrov <andrey.petrov@intel.com>
Reviewed-on: https://review.coreboot.org/15198
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/soc/intel/apollolake/reset.c b/src/soc/intel/apollolake/reset.c
new file mode 100644
index 0000000000..644d88d882
--- /dev/null
+++ b/src/soc/intel/apollolake/reset.c
@@ -0,0 +1,23 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Intel Corporation.
+ *
+ * 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.
+ */
+
+#include <reset.h>
+#include <soc/pm.h>
+
+void global_reset(void)
+{
+	global_reset_enable(1);
+	hard_reset();
+}