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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 for Hudson southbridges
*/
#include <arch/io.h>
#include <cpu/x86/smm.h>
#include "hudson.h"
#include "smi.h"
#define SMI_0x88_ACPI_COMMAND (1 << 11)
enum smi_source {
SMI_SOURCE_SCI = (1 << 0),
SMI_SOURCE_GPE = (1 << 1),
SMI_SOURCE_0x84 = (1 << 2),
SMI_SOURCE_0x88 = (1 << 3),
SMI_SOURCE_IRQ_TRAP = (1 << 4),
SMI_SOURCE_0x90 = (1 << 5)
};
static void hudson_apmc_smi_handler(void)
{
u32 reg32;
const uint8_t cmd = inb(ACPI_SMI_CTL_PORT);
switch (cmd) {
case ACPI_SMI_CMD_ENABLE:
reg32 = inl(ACPI_PM1_CNT_BLK);
reg32 |= (1 << 0); /* SCI_EN */
outl(reg32, ACPI_PM1_CNT_BLK);
break;
case ACPI_SMI_CMD_DISABLE:
reg32 = inl(ACPI_PM1_CNT_BLK);
reg32 &= ~(1 << 0); /* clear SCI_EN */
outl(ACPI_PM1_CNT_BLK, reg32);
break;
}
mainboard_smi_apmc(cmd);
}
int southbridge_io_trap_handler(int smif)
{
return 0;
}
static void process_smi_sci(void)
{
const uint32_t status = smi_read32(0x10);
/* Clear events to prevent re-entering SMI if event isn't handled */
smi_write32(0x10, status);
}
static void process_gpe_smi(void)
{
const uint32_t status = smi_read32(0x80);
const uint32_t gevent_mask = (1 << 24) - 1;
/* Only Bits [23:0] indicate GEVENT SMIs. */
if (status & gevent_mask) {
/* A GEVENT SMI occurred */
mainboard_smi_gpi(status & gevent_mask);
}
/* Clear events to prevent re-entering SMI if event isn't handled */
smi_write32(0x80, status);
}
static void process_smi_0x84(void)
{
const uint32_t status = smi_read32(0x84);
/* Clear events to prevent re-entering SMI if event isn't handled */
smi_write32(0x84, status);
}
static void process_smi_0x88(void)
{
const uint32_t status = smi_read32(0x88);
if (status & SMI_0x88_ACPI_COMMAND) {
/* Command received via ACPI SMI command port */
hudson_apmc_smi_handler();
}
/* Clear events to prevent re-entering SMI if event isn't handled */
smi_write32(0x88, status);
}
static void process_smi_0x8c(void)
{
const uint32_t status = smi_read32(0x8c);
/* Clear events to prevent re-entering SMI if event isn't handled */
smi_write32(0x8c, status);
}
static void process_smi_0x90(void)
{
const uint32_t status = smi_read32(0x90);
/* Clear events to prevent re-entering SMI if event isn't handled */
smi_write32(0x90, status);
}
void southbridge_smi_handler(void)
{
const uint16_t smi_src = smi_read16(0x94);
if (smi_src & SMI_SOURCE_SCI)
process_smi_sci();
if (smi_src & SMI_SOURCE_GPE)
process_gpe_smi();
if (smi_src & SMI_SOURCE_0x84)
process_smi_0x84();
if (smi_src & SMI_SOURCE_0x88)
process_smi_0x88();
if (smi_src & SMI_SOURCE_IRQ_TRAP)
process_smi_0x8c();
if (smi_src & SMI_SOURCE_0x90)
process_smi_0x90();
}
void southbridge_smi_set_eos(void)
{
uint32_t reg = smi_read32(SMI_REG_SMITRIG0);
reg |= SMITRG0_EOS;
smi_write32(SMI_REG_SMITRIG0, reg);
}
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