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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/device.h>
#include <device/pci.h>
#include <console/console.h>
#include <arch/io.h>
#include <cpu/x86/smm.h>
#include <cpu/intel/smm_reloc.h>
#include <soc/iomap.h>
#include <soc/pch.h>
#include <soc/pm.h>
void smm_southbridge_clear_state(void)
{
u32 smi_en;
smi_en = inl(ACPI_BASE_ADDRESS + SMI_EN);
if (smi_en & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
/* Dump and clear status registers */
clear_smi_status();
clear_pm1_status();
clear_tco_status();
clear_gpe_status();
}
static void smm_southbridge_enable(uint16_t pm1_events)
{
printk(BIOS_DEBUG, "Enabling SMIs.\n");
/* Configure events */
enable_pm1(pm1_events);
disable_gpe(PME_B0_EN);
/* Enable SMI generation:
* - on APMC writes (io 0xb2)
* - on writes to SLP_EN (sleep states)
* - on writes to GBL_RLS (bios commands)
* No SMIs:
* - on microcontroller writes (io 0x62/0x66)
* - on TCO events
*/
enable_smi(APMC_EN | SLP_SMI_EN | GBL_SMI_EN | EOS);
}
void global_smi_enable(void)
{
smm_southbridge_enable(PWRBTN_EN | GBL_EN);
}
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