From 1ae592b468d7b40d8c7f50d4fcb4dd515aeeaf74 Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Sun, 24 Mar 2019 14:41:45 +0100 Subject: sb/intel/common: Add common detect_s3_resume MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a common detect_s3_resume function. Will be used by other southbridge code. TODO: Merge with soc/intel/common/*/pmclib Tested on Lenovo T520 (Intel Sandy Bridge) with Change I283a841575430f2f179997db8d2f08fa3978a0bb applied as well. Still boots to OS, no errors visible in dmesg and S3 resume is working. Change-Id: I88023af522afac8164f068b0fbe0eac601aef702 Signed-off-by: Patrick Rudolph Reviewed-on: https://review.coreboot.org/c/coreboot/+/32036 Tested-by: build bot (Jenkins) Reviewed-by: Arthur Heymans Reviewed-by: Kyösti Mälkki --- src/southbridge/intel/common/pmclib.c | 52 +++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 src/southbridge/intel/common/pmclib.c (limited to 'src/southbridge/intel/common/pmclib.c') diff --git a/src/southbridge/intel/common/pmclib.c b/src/southbridge/intel/common/pmclib.c new file mode 100644 index 0000000000..198562baee --- /dev/null +++ b/src/southbridge/intel/common/pmclib.c @@ -0,0 +1,52 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2008-2009 coresystems GmbH + * + * 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 "pmclib.h" +#include "pmbase.h" +#include "pmutil.h" + +int southbridge_detect_s3_resume(void) +{ + u32 pm1_cnt; + u16 pm1_sts; + int is_s3 = 0; + + /* Check PM1_STS[15] to see if we are waking from Sx */ + pm1_sts = read_pmbase16(PM1_STS); + if (pm1_sts & WAK_STS) { + /* Read PM1_CNT[12:10] to determine which Sx state */ + pm1_cnt = read_pmbase32(PM1_CNT); + if (((pm1_cnt >> 10) & 7) == SLP_TYP_S3) { + /* Clear SLP_TYPE. */ + write_pmbase32(PM1_CNT, pm1_cnt & ~(7 << 10)); + is_s3 = 1; + } + } + if (is_s3) { + if (!acpi_s3_resume_allowed()) { + printk(BIOS_DEBUG, "SB: Resume from S3 detected, but disabled.\n"); + return 0; + } + + printk(BIOS_DEBUG, "SB: Resume from S3 detected.\n"); + } + + return is_s3; +} -- cgit v1.2.3