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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Advanced Micro Devices, Inc.
* 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.
*/
#include <console/console.h>
#include <cpu/x86/smm.h>
#include <delay.h>
#include <soc/smi.h>
#include <soc/southbridge.h>
static void sb_apmc_smi_handler(void)
{
u32 reg32;
const uint8_t cmd = inb(pm_acpi_smi_cmd_port());
switch (cmd) {
case APM_CNT_ACPI_ENABLE:
reg32 = inl(ACPI_PM1_CNT_BLK);
reg32 |= (1 << 0); /* SCI_EN */
outl(reg32, ACPI_PM1_CNT_BLK);
break;
case APM_CNT_ACPI_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;
}
/*
* Table of functions supported in the SMI handler. Note that SMI source setup
* in southbridge.c is unrelated to this list.
*/
struct smi_sources_t smi_sources[] = {
{ .type = SMITYPE_SMI_CMD_PORT, .handler = sb_apmc_smi_handler },
};
static void process_smi_sci(void)
{
const uint32_t status = smi_read32(SMI_SCI_STATUS);
/* Clear events to prevent re-entering SMI if event isn't handled */
smi_write32(SMI_SCI_STATUS, status);
}
static void *get_source_handler(int source)
{
int i;
for (i = 0 ; i < ARRAY_SIZE(smi_sources) ; i++)
if (smi_sources[i].type == source)
return smi_sources[i].handler;
return NULL;
}
static void process_smi_sources(uint32_t reg)
{
const uint32_t status = smi_read32(reg);
int bit_zero = 32 / sizeof(uint32_t) * (reg - SMI_REG_SMISTS0);
void (*source_handler)(void);
int i;
for (i = 0 ; i < 32 ; i++) {
if (status & (1 << i)) {
source_handler = get_source_handler(i + bit_zero);
if (source_handler)
source_handler();
}
}
if (reg == SMI_REG_SMISTS0)
if (status & GEVENT_MASK)
/* Gevent[23:0] are assumed to be mainboard-specific */
mainboard_smi_gpi(status & GEVENT_MASK);
/* Clear all events in this register */
smi_write32(reg, status);
}
void southbridge_smi_handler(void)
{
const uint16_t smi_src = smi_read16(SMI_REG_POINTER);
if (smi_src & SMI_STATUS_SRC_SCI)
process_smi_sci();
if (smi_src & SMI_STATUS_SRC_0)
process_smi_sources(SMI_REG_SMISTS0);
if (smi_src & SMI_STATUS_SRC_1)
process_smi_sources(SMI_REG_SMISTS1);
if (smi_src & SMI_STATUS_SRC_2)
process_smi_sources(SMI_REG_SMISTS2);
if (smi_src & SMI_STATUS_SRC_3)
process_smi_sources(SMI_REG_SMISTS3);
if (smi_src & SMI_STATUS_SRC_4)
process_smi_sources(SMI_REG_SMISTS4);
}
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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