smihandler.c

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <acpi/acpi.h>
#include <amdblocks/acpi.h>
#include <amdblocks/acpimmio.h>
#include <amdblocks/psp.h>
#include <amdblocks/smi.h>
#include <amdblocks/smm.h>
#include <arch/hlt.h>
#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/smm.h>
#include <elog.h>
#include <soc/smi.h>
#include <soc/smu.h>
#include <soc/southbridge.h>
#include <types.h>
 
static void fch_apmc_smi_handler(void)
{
        const uint8_t cmd = inb(pm_acpi_smi_cmd_port());
 
        switch (cmd) {
        case APM_CNT_ACPI_ENABLE:
                acpi_clear_pm_gpe_status();
                acpi_enable_sci();
                break;
        case APM_CNT_ACPI_DISABLE:
                acpi_disable_sci();
                break;
        case APM_CNT_ELOG_GSMI:
                if (CONFIG(ELOG_GSMI))
                        handle_smi_gsmi();
                break;
        case APM_CNT_SMMSTORE:
                if (CONFIG(SMMSTORE))
                        handle_smi_store();
                break;
        case APM_CNT_SMMINFO:
                psp_notify_smm();
                break;
        }
 
        mainboard_smi_apmc(cmd);
}
 
static void fch_slp_typ_handler(void)
{
        uint32_t pci_ctrl, reg32;
        uint16_t pm1cnt, reg16;
        uint8_t slp_typ, rst_ctrl;
 
        /* Figure out SLP_TYP */
        pm1cnt = acpi_read16(MMIO_ACPI_PM1_CNT_BLK);
        printk(BIOS_SPEW, "SMI#: SLP = 0x%04x\n", pm1cnt);
        slp_typ = acpi_sleep_from_pm1(pm1cnt);
 
        /* Do any mainboard sleep handling */
        mainboard_smi_sleep(slp_typ);
 
        switch (slp_typ) {
        case ACPI_S0:
                printk(BIOS_DEBUG, "SMI#: Entering S0 (On)\n");
                break;
        case ACPI_S3:
                printk(BIOS_DEBUG, "SMI#: Entering S3 (Suspend-To-RAM)\n");
                break;
        case ACPI_S4:
                printk(BIOS_DEBUG, "SMI#: Entering S4 (Suspend-To-Disk)\n");
                break;
        case ACPI_S5:
                printk(BIOS_DEBUG, "SMI#: Entering S5 (Soft Power off)\n");
                break;
        default:
                printk(BIOS_DEBUG, "SMI#: ERROR: SLP_TYP reserved\n");
                break;
        }
 
        if (slp_typ >= ACPI_S3) {
                /* Sleep Type Elog S3, S4, and S5 entry */
                elog_gsmi_add_event_byte(ELOG_TYPE_ACPI_ENTER, slp_typ);
 
                wbinvd();
 
                clear_all_smi_status();
 
                /* Do not send SMI before AcpiPm1CntBlkx00[SlpTyp] */
                pci_ctrl = pm_read32(PM_PCI_CTRL);
                pci_ctrl &= ~FORCE_SLPSTATE_RETRY;
                pm_write32(PM_PCI_CTRL, pci_ctrl);
 
                /* Enable SlpTyp */
                rst_ctrl = pm_read8(PM_RST_CTRL1);
                rst_ctrl |= SLPTYPE_CONTROL_EN;
                pm_write8(PM_RST_CTRL1, rst_ctrl);
 
                /*
                 * Before the final command, check if there's pending wake
                 * event. Read enable first, so that reading the actual status
                 * is as close as possible to entering S3. The idea is to
                 * minimize the opportunity for a wake event to happen before
                 * actually entering S3. If there's a pending wake event, log
                 * it and continue normal path. S3 will fail and the wake event
                 * becomes a SCI.
                 */
                if (CONFIG(ELOG_GSMI)) {
                        reg16 = acpi_read16(MMIO_ACPI_PM1_EN);
                        reg16 &= acpi_read16(MMIO_ACPI_PM1_STS);
                        if (reg16)
                                elog_add_extended_event(
                                                ELOG_SLEEP_PENDING_PM1_WAKE,
                                                (u32)reg16);
 
                        reg32 = acpi_read32(MMIO_ACPI_GPE0_EN);
                        reg32 &= acpi_read32(MMIO_ACPI_GPE0_STS);
                        if (reg32)
                                elog_add_extended_event(
                                                ELOG_SLEEP_PENDING_GPE0_WAKE,
                                                reg32);
                } /* if (CONFIG(ELOG_GSMI)) */
 
                if (slp_typ == ACPI_S3)
                        psp_notify_sx_info(ACPI_S3);
 
                smu_sx_entry(); /* Leave SlpTypeEn clear, SMU will set */
                printk(BIOS_ERR, "System did not go to sleep\n");
 
                hlt();
        }
}
 
int southbridge_io_trap_handler(int smif)
{
        return 0;
}
 
/*
 * Table of functions supported in the SMI handler.  Note that SMI source setup
 * in fch.c is unrelated to this list.
 */
static const struct smi_sources_t smi_sources[] = {
        { .type = SMITYPE_SMI_CMD_PORT, .handler = fch_apmc_smi_handler },
        { .type = SMITYPE_SLP_TYP, .handler = fch_slp_typ_handler},
};
 
void *get_smi_source_handler(int source)
{
        size_t i;
 
        for (i = 0 ; i < ARRAY_SIZE(smi_sources) ; i++)
                if (smi_sources[i].type == source)
                        return smi_sources[i].handler;
 
        return NULL;
}