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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#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 <southbridge/intel/common/pmbase.h>
#include <southbridge/intel/common/pmutil.h>
#include "pmutil.h"
#define DEBUG_PERIODIC_SMIS 0
u16 get_pmbase(void)
{
return lpc_get_pmbase();
}
void smm_southbridge_enable_smi(void)
{
u32 smi_en;
u16 pm1_en;
u32 gpe0_en;
if (CONFIG(ELOG))
/* Log events from chipset before clearing */
pch_log_state();
printk(BIOS_DEBUG, "Initializing southbridge SMI...");
printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", lpc_get_pmbase());
smi_en = read_pmbase32(SMI_EN);
if (smi_en & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
printk(BIOS_DEBUG, "\n");
dump_smi_status(reset_smi_status());
dump_pm1_status(reset_pm1_status());
dump_gpe0_status(reset_gpe0_status());
dump_alt_gp_smi_status(reset_alt_gp_smi_status());
dump_tco_status(reset_tco_status());
/* Disable GPE0 PME_B0 */
gpe0_en = read_pmbase32(GPE0_EN);
gpe0_en &= ~PME_B0_EN;
write_pmbase32(GPE0_EN, gpe0_en);
pm1_en = 0;
pm1_en |= PWRBTN_EN;
pm1_en |= GBL_EN;
write_pmbase16(PM1_EN, pm1_en);
/* Enable SMI generation:
* - on TCO events
* - 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)
*/
smi_en = 0; /* reset SMI enables */
#if 0
smi_en |= LEGACY_USB2_EN | LEGACY_USB_EN;
#endif
smi_en |= TCO_EN;
smi_en |= APMC_EN;
#if DEBUG_PERIODIC_SMIS
/* Set DEBUG_PERIODIC_SMIS in pch.h to debug using
* periodic SMIs.
*/
smi_en |= PERIODIC_EN;
#endif
smi_en |= SLP_SMI_EN;
#if 0
smi_en |= BIOS_EN;
#endif
/* The following need to be on for SMIs to happen */
smi_en |= EOS | GBL_SMI_EN;
write_pmbase32(SMI_EN, smi_en);
}
void smm_setup_structures(void *gnvs, void *tcg, void *smi1)
{
/*
* Issue SMI to set the gnvs pointer in SMM.
* tcg and smi1 are unused.
*
* EAX = APM_CNT_GNVS_UPDATE
* EBX = gnvs pointer
* EDX = APM_CNT
*/
asm volatile (
"outb %%al, %%dx\n\t"
: /* ignore result */
: "a" (APM_CNT_GNVS_UPDATE),
"b" ((uintptr_t)gnvs),
"d" (APM_CNT)
);
}
void smm_southbridge_clear_state(void)
{
u32 smi_en;
if (CONFIG(ELOG))
/* Log events from chipset before clearing */
pch_log_state();
printk(BIOS_DEBUG, "Initializing Southbridge SMI...\n");
printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", get_pmbase());
smi_en = inl(get_pmbase() + SMI_EN);
if (smi_en & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
printk(BIOS_DEBUG, "\n");
/* Dump and clear status registers */
reset_smi_status();
reset_pm1_status();
reset_tco_status();
reset_gpe0_status();
}
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