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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Alexandru Gagniuc <mr.nuke.me@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
/*
* SMI handler -- mostly takes care of SMIs from the EC
*/
#include "ec.h"
#include <arch/io.h>
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <delay.h>
#include <ec/compal/ene932/ec.h>
#include <southbridge/amd/agesa/hudson/hudson.h>
#include <southbridge/amd/agesa/hudson/smi.h>
#define ACPI_PM1_CNT_SLEEP(state) ((1 << 13) | (state & 0x7) << 10)
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.
*/
switch (src) {
case EC_SMI_BATTERY_LOW:
printk(BIOS_DEBUG, "Battery low. Shutting down\n");
outl(ACPI_PM1_CNT_SLEEP(S5), ACPI_PM1_CNT_BLK);
break;
default:
printk(BIOS_DEBUG, "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);
}
static void handle_lid_smi(void)
{
/* Only triggered in non-ACPI mode on lid close. */
outl(ACPI_PM1_CNT_SLEEP(S4), ACPI_PM1_CNT_BLK);
}
int mainboard_smi_apmc(uint8_t data)
{
switch (data) {
case ACPI_SMI_CMD_ENABLE:
printk(BIOS_DEBUG, "Enable ACPI mode\n");
ec_enter_acpi_mode();
hudson_disable_gevent_smi(EC_LID_GEVENT);
break;
case ACPI_SMI_CMD_DISABLE:
printk(BIOS_DEBUG, "Disable ACPI mode\n");
ec_enter_apm_mode();
hudson_configure_gevent_smi(EC_LID_GEVENT, SMI_MODE_SMI,
SMI_LVL_LOW);
break;
default:
printk(BIOS_DEBUG, "Unhandled ACPI command: 0x%x\n", data);
}
return 0;
}
void mainboard_smi_gpi(uint32_t gpi_sts)
{
if (gpi_sts & (1 << EC_SMI_GEVENT))
handle_ec_smi();
if (gpi_sts & (1 << EC_LID_GEVENT))
handle_lid_smi();
}
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