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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 <southbridge/intel/common/pmbase.h>
#include <southbridge/intel/common/pmutil.h>
#include "pmutil.h"
u16 get_pmbase(void)
{
return lpc_get_pmbase();
}
static int smi_enabled(void)
{
u32 smi_en;
/* Log events from chipset before clearing */
if (CONFIG(ELOG))
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 1;
}
printk(BIOS_DEBUG, "\n");
return 0;
}
static void smm_southbridge_enable(uint16_t pm1_events)
{
u32 smi_en;
u32 gpe0_en;
/* Disable GPE0 PME_B0 */
gpe0_en = read_pmbase32(GPE0_EN);
gpe0_en &= ~PME_B0_EN;
write_pmbase32(GPE0_EN, gpe0_en);
write_pmbase16(PM1_EN, pm1_events);
/* Enable SMI generation:
* - on TCO events
* - on APMC writes (io 0xb2)
* - on writes to SLP_EN (sleep states)
* No SMIs:
* - on microcontroller writes (io 0x62/0x66)
*/
smi_en = 0; /* reset SMI enables */
smi_en |= TCO_EN;
smi_en |= APMC_EN;
if (CONFIG(DEBUG_PERIODIC_SMI))
smi_en |= PERIODIC_EN;
smi_en |= SLP_SMI_EN;
/* The following need to be on for SMIs to happen */
smi_en |= EOS | GBL_SMI_EN;
write_pmbase32(SMI_EN, smi_en);
}
void global_smi_enable(void)
{
if (smi_enabled())
return;
dump_all_status();
smm_southbridge_enable(PWRBTN_EN | GBL_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)
{
if (smi_enabled())
return;
/* Dump and clear status registers */
reset_smi_status();
reset_pm1_status();
reset_tco_status();
reset_gpe0_status();
}
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