smihandler.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <ec/acpi/ec.h>
#include <ec/compal/ene932/ec.h>
#include <southbridge/intel/bd82x6x/pch.h>
#include <southbridge/intel/common/pmutil.h>
 
#include "ec.h"
 
#define GPE_PALMDET1    2
#define GPE_PALMDET2    4
#define GPE_EC_SCI      7
#define GPE_EC_SMI      8
/* FIXME: check this */
#define GPE_EC_WAKE     13
 
enum sleep_states {
        S0 = 0,
        S1 = 1,
        S3 = 3,
        S4 = 4,
        S5 = 5,
};
 
enum ec_smi_event {
        EC_SMI_EVENT_IDLE = 0x80,
        EC_SMI_BATTERY_LOW = 0xb3,
};
 
/* Tell EC to operate in APM mode. Events generate SMIs instead of SCIs. */
static void ec_enter_apm_mode(void)
{
        ec_kbc_write_cmd(0x59);
        ec_kbc_write_ib(0xE9);
}
/* Tell EC to operate in ACPI mode, thus generating SCIs on events, not SMIs. */
static void ec_enter_acpi_mode(void)
{
        ec_kbc_write_cmd(0x59);
        ec_kbc_write_ib(0xE8);
}
 
static uint8_t ec_get_smi_event(void)
{
        ec_kbc_write_cmd(0x56);
        return ec_kbc_read_ob();
}
 
static void ec_process_smi(uint8_t src)
{
        /*
         * Reading the SMI source satisfies the EC in terms of responding to
         * the event, regardless of whether we take an action or not.
         */
 
        printk(BIOS_DEBUG, "Unhandled EC_SMI event 0x%x\n", src);
}
 
static void handle_ec_smi(void)
{
        uint8_t src;
 
        while ((src = ec_get_smi_event()) != EC_SMI_EVENT_IDLE)
                ec_process_smi(src);
}
 
void mainboard_smi_gpi(u32 gpi_sts)
{
        if (gpi_sts & (1 << GPE_EC_SMI))
                handle_ec_smi();
}
 
int mainboard_smi_apmc(u8 data)
{
        switch (data) {
        case APM_CNT_ACPI_ENABLE:
                ec_enter_acpi_mode();
                gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SCI);
                gpi_route_interrupt(GPE_PALMDET1, GPI_IS_SCI);
                gpi_route_interrupt(GPE_PALMDET2, GPI_IS_SCI);
                break;
        case APM_CNT_ACPI_DISABLE:
                ec_enter_apm_mode();
                gpi_route_interrupt(GPE_EC_SCI, GPI_IS_SMI);
                break;
        default:
                printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data);
        }
        return 0;
}
 
void mainboard_smi_sleep(u8 slp_typ)
{
        if (slp_typ == S3) {
                u8 ec_wake = ec_read(0x32);
                /* If EC wake events are enabled, enable wake on EC WAKE GPE. */
                if (ec_wake & 0x14)
                        gpi_route_interrupt(GPE_EC_WAKE, GPI_IS_SCI);
        }
}