From 6f762171de4b8514fddd430052cbf24524e09e5d Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Thu, 9 Jun 2016 21:35:50 -0700 Subject: intel/apollolake: Use custom reset calls Due to USB LDO issue in current steppings, cold reboot needs to be temporarily disabled. Thus, hard_reset call should be the same as soft_reset. Once future steppings are available INTEL_COMMON_RESET can be enabled again. Change-Id: If0ec56db3864d500acc93d2b363a78a6cd7632da Signed-off-by: Furquan Shaikh Reviewed-on: https://review.coreboot.org/15143 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/soc/intel/apollolake/reset.c | 50 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 src/soc/intel/apollolake/reset.c (limited to 'src/soc/intel/apollolake/reset.c') diff --git a/src/soc/intel/apollolake/reset.c b/src/soc/intel/apollolake/reset.c new file mode 100644 index 0000000000..eb43c41262 --- /dev/null +++ b/src/soc/intel/apollolake/reset.c @@ -0,0 +1,50 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2008-2009 coresystems GmbH + * Copyright (C) 2014-2016 Google Inc. + * Copyright (C) 2015 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 +#include +#include +#include + +/* Reset control port */ +#define RST_CNT 0xcf9 +#define FULL_RST (1 << 3) +#define RST_CPU (1 << 2) +#define SYS_RST (1 << 1) + +/* + * Temporary disable cold reboot on Apollolake platform due to USB LDO issue. + * Should be fixed in later stepping. + */ +void hard_reset(void) +{ + soft_reset(); +} + +void soft_reset(void) +{ + /* PMC_PLTRST# asserted. */ + outb(RST_CPU | SYS_RST, RST_CNT); + halt(); +} + +void cpu_reset(void) +{ + /* Sends INIT# to CPU */ + outb(RST_CPU, RST_CNT); + halt(); +} -- cgit v1.2.3