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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 <console/console.h>
#include <soc/southbridge.h>
#include <soc/smi.h>
void configure_smi(uint8_t smi_num, uint8_t mode)
{
uint8_t reg32_offset, bit_offset;
uint32_t reg32;
if (smi_num >= NUMBER_SMITYPES) {
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__SCI_LVL_LOW or SMI_SCI_LVL_HIGH
*/
void configure_gevent_smi(uint8_t gevent, uint8_t mode, uint8_t level)
{
uint32_t reg32;
/* GEVENT pins range from [0:23] */
if (gevent >= SMI_GEVENTS) {
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);
}
/**
* Configure generation of SCIs.
*/
void configure_scimap(const struct sci_source *sci)
{
uint32_t reg32;
/* GEVENT pins range */
if (sci->scimap >= SCIMAPS) {
printk(BIOS_WARNING, "BUG: Invalid SCIMAP: %u\n",
sci->scimap);
return;
}
/* GPEs range from [0:31] */
if (sci->gpe >= SCI_GPES) {
printk(BIOS_WARNING, "BUG: Invalid SCI GPE: %u\n", sci->gpe);
return;
}
printk(BIOS_DEBUG, "SCIMAP %u maps to GPE %u (active %s, %s trigger)\n",
sci->scimap, sci->gpe,
(!!sci->direction) ? "high" : "low",
(!!sci->level) ? "level" : "edge");
/* Map Gevent to SCI GPE# */
smi_write8(SMI_SCI_MAP(sci->scimap), sci->gpe);
/* Set the trigger direction (high/low) */
reg32 = smi_read32(SMI_SCI_TRIG);
reg32 &= ~(1 << sci->gpe);
reg32 |= !!sci->direction << sci->gpe;
smi_write32(SMI_SCI_TRIG, reg32);
/* Set the trigger level (edge/level) */
reg32 = smi_read32(SMI_SCI_LEVEL);
reg32 &= ~(1 << sci->gpe);
reg32 |= !!sci->level << sci->gpe;
smi_write32(SMI_SCI_LEVEL, reg32);
}
void gpe_configure_sci(const struct sci_source *scis, size_t num_gpes)
{
size_t i;
for (i = 0; i < num_gpes; i++)
configure_scimap(scis + i);
}
/** Disable events from given GEVENT pin */
void 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);
}
uint16_t pm_acpi_smi_cmd_port(void)
{
return pm_read16(PM_ACPI_SMI_CMD);
}
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