intel: Use CF9 reset (part 2)

Make use of the common CF9 reset in SOC_INTEL_COMMON_RESET. Also
implement board_reset() as a "full reset" (aka. cold reset) as that
is what was used here for hard_reset().

Drop soc_reset_prepare() thereby, as it was only used for APL. Also,
move the global-reset logic.

We leave some comments to remind us that a system_reset() should
be enough, where a full_reset() is called now (to retain current
behaviour) and looks suspicious.

Note, as no global_reset() is implemented for Denverton-NS, we halt
there now instead of issuing a non-global reset. This seems safer;
a non-global reset might result in a reset loop.

Change-Id: I5e7025c3c9ea6ded18e72037412b60a1df31bd53
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/29169
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/soc/intel/common/reset.h b/src/soc/intel/common/reset.h
new file mode 100644
index 0000000000..0e605d6c61
--- /dev/null
+++ b/src/soc/intel/common/reset.h
@@ -0,0 +1,28 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef _INTEL_COMMON_RESET_H_
+#define _INTEL_COMMON_RESET_H_
+
+/*
+ * Implement SoC specific global reset (i.e. a reset of both host and
+ * ME partitions). Usually the ME is asked to perform the reset first.
+ * If that doesn't work out, fall back to a manual global reset.
+ */
+void do_global_reset(void);
+
+/* Prepare for reset, run do_global_reset(), halt. */
+__noreturn void global_reset(void);
+
+#endif	/* _INTEL_COMMON_RESET_H_ */