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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.
*/
/*
* SMM utilities used in both SMM and normal mode
*/
#include "smi.h"
#include <console/console.h>
#define HUDSON_SMI_ACPI_COMMAND 75
static void configure_smi(uint8_t smi_num, uint8_t mode)
{
uint8_t reg32_offset, bit_offset;
uint32_t reg32;
/* SMI sources range from [0:149] */
if (smi_num > 149) {
printk(BIOS_WARNING, "BUG: Invalid SMI: %u\n", smi_num);
return;
}
/* 16 sources per register, 2 bits per source; registers are 4 bytes */
reg32_offset = (smi_num / 16) * 4;
bit_offset = (smi_num % 16) * 2;
reg32 = smi_read32(SMI_REG_CONTROL0 + reg32_offset);
reg32 &= ~(0x3 << (bit_offset));
reg32 |= (mode & 0x3) << bit_offset;
smi_write32(SMI_REG_CONTROL0 + reg32_offset, reg32);
}
/**
* Configure generation of interrupts for given GEVENT pin
*
* @param gevent The GEVENT pin number. Valid values are 0 thru 23
* @param mode The type of event this pin should generate. Note that only
* SMI_MODE_SMI generates an SMI. SMI_MODE_DISABLE disables events.
* @param level SMI_LVL_LOW or SMI_LVL_HIGH
*/
void hudson_configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level)
{
uint32_t reg32;
/* GEVENT pins range from [0:23] */
if (gevent > 23) {
printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
return;
}
/* SMI0 source is GEVENT0 and so on */
configure_smi(gevent, mode);
/* And set set the trigger level */
reg32 = smi_read32(SMI_REG_SMITRIG0);
reg32 &= ~(1 << gevent);
reg32 |= (level & 0x1) << gevent;
smi_write32(SMI_REG_SMITRIG0, reg32);
}
/** Disable events from given GEVENT pin */
void hudson_disable_gevent_smi(uint8_t gevent)
{
/* GEVENT pins range from [0:23] */
if (gevent > 23) {
printk(BIOS_WARNING, "BUG: Invalid GEVENT: %u\n", gevent);
return;
}
/* SMI0 source is GEVENT0 and so on */
configure_smi(gevent, SMI_MODE_DISABLE);
}
/** Enable SMIs on writes to ACPI SMI command port */
void hudson_enable_acpi_cmd_smi(void)
{
configure_smi(HUDSON_SMI_ACPI_COMMAND, SMI_MODE_SMI);
}
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