From 446082946a796436f738af8c2863c1c28a0ccb01 Mon Sep 17 00:00:00 2001 From: Duncan Laurie Date: Wed, 7 Nov 2018 11:36:35 -0700 Subject: soc/intel/common: Add option to disable eSPI SMI at runtime Add an option that will disable eSPI SMI when ACPI mode is enabled, and re-enable eSPI SMI when ACPI mode is disabled. Additionally it ensures eSPI SMI is disabled on the ACPI OS resume path. This allows a mainboard to ensure that the Embedded Controller will not be able to assert SMI at runtime when booted into an ACPI aware operating system. This was tested on a Sarien board with the Wilco EC to ensure that the eSPI SMI enable bit is clear when booted into the OS, and remains clear after resume. Change-Id: Ic305c3498dfa4b8166cfdb070fc404dd4618ba3c Signed-off-by: Duncan Laurie Reviewed-on: https://review.coreboot.org/29535 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin Reviewed-by: Furquan Shaikh --- src/soc/intel/common/block/smm/Kconfig | 8 ++++++++ src/soc/intel/common/block/smm/smihandler.c | 4 ++++ src/soc/intel/common/block/smm/smm.c | 9 +++++++++ 3 files changed, 21 insertions(+) (limited to 'src/soc/intel/common/block') diff --git a/src/soc/intel/common/block/smm/Kconfig b/src/soc/intel/common/block/smm/Kconfig index 909382e0ee..cc6bc44f58 100644 --- a/src/soc/intel/common/block/smm/Kconfig +++ b/src/soc/intel/common/block/smm/Kconfig @@ -8,6 +8,14 @@ config SOC_INTEL_COMMON_BLOCK_SMM_IO_TRAP help Intel Processor trap flag if it is supported +config SOC_INTEL_COMMON_BLOCK_SMM_ESPI_ACPI_DIS + bool + default n + help + Disable eSPI SMI when ACPI mode is enabled. This will + prevent the embedded controller from asserting SMI when + booted into an ACPI aware OS. + config SOC_INTEL_COMMON_BLOCK_SMM_S5_DELAY_MS int default 100 if CHROMEOS diff --git a/src/soc/intel/common/block/smm/smihandler.c b/src/soc/intel/common/block/smm/smihandler.c index 9e8d346d24..0832bb5558 100644 --- a/src/soc/intel/common/block/smm/smihandler.c +++ b/src/soc/intel/common/block/smm/smihandler.c @@ -362,10 +362,14 @@ void smihandler_southbridge_apmc( break; case APM_CNT_ACPI_DISABLE: pmc_disable_pm1_control(SCI_EN); + if (IS_ENABLED(CONFIG_SOC_INTEL_COMMON_BLOCK_SMM_ESPI_ACPI_DIS)) + pmc_enable_smi(ESPI_SMI_EN); printk(BIOS_DEBUG, "SMI#: ACPI disabled.\n"); break; case APM_CNT_ACPI_ENABLE: pmc_enable_pm1_control(SCI_EN); + if (IS_ENABLED(CONFIG_SOC_INTEL_COMMON_BLOCK_SMM_ESPI_ACPI_DIS)) + pmc_disable_smi(ESPI_SMI_EN); printk(BIOS_DEBUG, "SMI#: ACPI enabled.\n"); break; case APM_CNT_GNVS_UPDATE: diff --git a/src/soc/intel/common/block/smm/smm.c b/src/soc/intel/common/block/smm/smm.c index 6059995493..d929975186 100644 --- a/src/soc/intel/common/block/smm/smm.c +++ b/src/soc/intel/common/block/smm/smm.c @@ -15,6 +15,7 @@ * GNU General Public License for more details. */ +#include #include #include #include @@ -93,3 +94,11 @@ void smm_region_info(void **start, size_t *size) *start = (void *)sa_get_tseg_base(); *size = sa_get_tseg_size(); } + +#if IS_ENABLED(CONFIG_SOC_INTEL_COMMON_BLOCK_SMM_ESPI_ACPI_DIS) +static void smm_disable_espi(void *dest) +{ + pmc_disable_smi(ESPI_SMI_EN); +} +BOOT_STATE_INIT_ENTRY(BS_OS_RESUME, BS_ON_ENTRY, smm_disable_espi, NULL); +#endif -- cgit v1.2.3