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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2008-2009 coresystems GmbH
*
* 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.
*
* 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.
*/
#define __SIMPLE_DEVICE__
#include <device/device.h>
#include <device/pci.h>
#include <console/console.h>
#include <arch/io.h>
#include <cpu/cpu.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/smm.h>
#include <string.h>
#include <cpu/intel/smm/gen1/smi.h>
#include "pch.h"
/* While we read PMBASE dynamically in case it changed, let's
* initialize it with a sane value
*/
static u16 pmbase = DEFAULT_PMBASE;
/**
* @brief read and clear PM1_STS
* @return PM1_STS register
*/
static u16 reset_pm1_status(void)
{
u16 reg16;
reg16 = inw(pmbase + PM1_STS);
/* set status bits are cleared by writing 1 to them */
outw(reg16, pmbase + PM1_STS);
return reg16;
}
static void dump_pm1_status(u16 pm1_sts)
{
printk(BIOS_DEBUG, "PM1_STS: ");
if (pm1_sts & (1 << 15)) printk(BIOS_DEBUG, "WAK ");
if (pm1_sts & (1 << 14)) printk(BIOS_DEBUG, "PCIEXPWAK ");
if (pm1_sts & (1 << 11)) printk(BIOS_DEBUG, "PRBTNOR ");
if (pm1_sts & (1 << 10)) printk(BIOS_DEBUG, "RTC ");
if (pm1_sts & (1 << 8)) printk(BIOS_DEBUG, "PWRBTN ");
if (pm1_sts & (1 << 5)) printk(BIOS_DEBUG, "GBL ");
if (pm1_sts & (1 << 4)) printk(BIOS_DEBUG, "BM ");
if (pm1_sts & (1 << 0)) printk(BIOS_DEBUG, "TMROF ");
printk(BIOS_DEBUG, "\n");
}
/**
* @brief read and clear SMI_STS
* @return SMI_STS register
*/
static u32 reset_smi_status(void)
{
u32 reg32;
reg32 = inl(pmbase + SMI_STS);
/* set status bits are cleared by writing 1 to them */
outl(reg32, pmbase + SMI_STS);
return reg32;
}
static void dump_smi_status(u32 smi_sts)
{
printk(BIOS_DEBUG, "SMI_STS: ");
if (smi_sts & (1 << 26)) printk(BIOS_DEBUG, "SPI ");
if (smi_sts & (1 << 25)) printk(BIOS_DEBUG, "EL_SMI ");
if (smi_sts & (1 << 21)) printk(BIOS_DEBUG, "MONITOR ");
if (smi_sts & (1 << 20)) printk(BIOS_DEBUG, "PCI_EXP_SMI ");
if (smi_sts & (1 << 18)) printk(BIOS_DEBUG, "INTEL_USB2 ");
if (smi_sts & (1 << 17)) printk(BIOS_DEBUG, "LEGACY_USB2 ");
if (smi_sts & (1 << 16)) printk(BIOS_DEBUG, "SMBUS_SMI ");
if (smi_sts & (1 << 15)) printk(BIOS_DEBUG, "SERIRQ_SMI ");
if (smi_sts & (1 << 14)) printk(BIOS_DEBUG, "PERIODIC ");
if (smi_sts & (1 << 13)) printk(BIOS_DEBUG, "TCO ");
if (smi_sts & (1 << 12)) printk(BIOS_DEBUG, "DEVMON ");
if (smi_sts & (1 << 11)) printk(BIOS_DEBUG, "MCSMI ");
if (smi_sts & (1 << 10)) printk(BIOS_DEBUG, "GPI ");
if (smi_sts & (1 << 9)) printk(BIOS_DEBUG, "GPE0 ");
if (smi_sts & (1 << 8)) printk(BIOS_DEBUG, "PM1 ");
if (smi_sts & (1 << 6)) printk(BIOS_DEBUG, "SWSMI_TMR ");
if (smi_sts & (1 << 5)) printk(BIOS_DEBUG, "APM ");
if (smi_sts & (1 << 4)) printk(BIOS_DEBUG, "SLP_SMI ");
if (smi_sts & (1 << 3)) printk(BIOS_DEBUG, "LEGACY_USB ");
if (smi_sts & (1 << 2)) printk(BIOS_DEBUG, "BIOS ");
printk(BIOS_DEBUG, "\n");
}
/**
* @brief read and clear GPE0_STS
* @return GPE0_STS register
*/
static u32 reset_gpe0_status(void)
{
u32 reg32;
reg32 = inl(pmbase + GPE0_STS);
/* set status bits are cleared by writing 1 to them */
outl(reg32, pmbase + GPE0_STS);
return reg32;
}
static void dump_gpe0_status(u32 gpe0_sts)
{
int i;
printk(BIOS_DEBUG, "GPE0_STS: ");
for (i=31; i>= 16; i--) {
if (gpe0_sts & (1 << i)) printk(BIOS_DEBUG, "GPIO%d ", (i-16));
}
if (gpe0_sts & (1 << 14)) printk(BIOS_DEBUG, "USB4 ");
if (gpe0_sts & (1 << 13)) printk(BIOS_DEBUG, "PME_B0 ");
if (gpe0_sts & (1 << 12)) printk(BIOS_DEBUG, "USB3 ");
if (gpe0_sts & (1 << 11)) printk(BIOS_DEBUG, "PME ");
if (gpe0_sts & (1 << 10)) printk(BIOS_DEBUG, "EL_SCI/BATLOW ");
if (gpe0_sts & (1 << 9)) printk(BIOS_DEBUG, "PCI_EXP ");
if (gpe0_sts & (1 << 8)) printk(BIOS_DEBUG, "RI ");
if (gpe0_sts & (1 << 7)) printk(BIOS_DEBUG, "SMB_WAK ");
if (gpe0_sts & (1 << 6)) printk(BIOS_DEBUG, "TCO_SCI ");
if (gpe0_sts & (1 << 5)) printk(BIOS_DEBUG, "AC97 ");
if (gpe0_sts & (1 << 4)) printk(BIOS_DEBUG, "USB2 ");
if (gpe0_sts & (1 << 3)) printk(BIOS_DEBUG, "USB1 ");
if (gpe0_sts & (1 << 2)) printk(BIOS_DEBUG, "HOT_PLUG ");
if (gpe0_sts & (1 << 0)) printk(BIOS_DEBUG, "THRM ");
printk(BIOS_DEBUG, "\n");
}
/**
* @brief read and clear ALT_GP_SMI_STS
* @return ALT_GP_SMI_STS register
*/
static u16 reset_alt_gp_smi_status(void)
{
u16 reg16;
reg16 = inl(pmbase + ALT_GP_SMI_STS);
/* set status bits are cleared by writing 1 to them */
outl(reg16, pmbase + ALT_GP_SMI_STS);
return reg16;
}
static void dump_alt_gp_smi_status(u16 alt_gp_smi_sts)
{
int i;
printk(BIOS_DEBUG, "ALT_GP_SMI_STS: ");
for (i=15; i>= 0; i--) {
if (alt_gp_smi_sts & (1 << i)) printk(BIOS_DEBUG, "GPI%d ", i);
}
printk(BIOS_DEBUG, "\n");
}
/**
* @brief read and clear TCOx_STS
* @return TCOx_STS registers
*/
static u32 reset_tco_status(void)
{
u32 tcobase = pmbase + 0x60;
u32 reg32;
reg32 = inl(tcobase + 0x04);
/* set status bits are cleared by writing 1 to them */
outl(reg32 & ~(1 << 18), tcobase + 0x04); // Don't clear BOOT_STS before SECOND_TO_STS
if (reg32 & (1 << 18))
outl(reg32 & (1 << 18), tcobase + 0x04); // clear BOOT_STS
return reg32;
}
static void dump_tco_status(u32 tco_sts)
{
printk(BIOS_DEBUG, "TCO_STS: ");
if (tco_sts & (1 << 20)) printk(BIOS_DEBUG, "SMLINK_SLV ");
if (tco_sts & (1 << 18)) printk(BIOS_DEBUG, "BOOT ");
if (tco_sts & (1 << 17)) printk(BIOS_DEBUG, "SECOND_TO ");
if (tco_sts & (1 << 16)) printk(BIOS_DEBUG, "INTRD_DET ");
if (tco_sts & (1 << 12)) printk(BIOS_DEBUG, "DMISERR ");
if (tco_sts & (1 << 10)) printk(BIOS_DEBUG, "DMISMI ");
if (tco_sts & (1 << 9)) printk(BIOS_DEBUG, "DMISCI ");
if (tco_sts & (1 << 8)) printk(BIOS_DEBUG, "BIOSWR ");
if (tco_sts & (1 << 7)) printk(BIOS_DEBUG, "NEWCENTURY ");
if (tco_sts & (1 << 3)) printk(BIOS_DEBUG, "TIMEOUT ");
if (tco_sts & (1 << 2)) printk(BIOS_DEBUG, "TCO_INT ");
if (tco_sts & (1 << 1)) printk(BIOS_DEBUG, "SW_TCO ");
if (tco_sts & (1 << 0)) printk(BIOS_DEBUG, "NMI2SMI ");
printk(BIOS_DEBUG, "\n");
}
/**
* @brief Set the EOS bit
*/
static void smi_set_eos(void)
{
u8 reg8;
reg8 = inb(pmbase + SMI_EN);
reg8 |= EOS;
outb(reg8, pmbase + SMI_EN);
}
void southbridge_smm_init(void)
{
u32 smi_en;
u16 pm1_en;
u32 gpe0_en;
#if CONFIG_ELOG
/* Log events from chipset before clearing */
pch_log_state();
#endif
printk(BIOS_DEBUG, "Initializing southbridge SMI...");
pmbase = pci_read_config32(PCI_DEV(0, 0x1f, 0),
PMBASE) & 0xff80;
printk(BIOS_SPEW, " ... pmbase = 0x%04x\n", pmbase);
smi_en = inl(pmbase + SMI_EN);
if (smi_en & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
printk(BIOS_DEBUG, "\n");
dump_smi_status(reset_smi_status());
dump_pm1_status(reset_pm1_status());
dump_gpe0_status(reset_gpe0_status());
dump_alt_gp_smi_status(reset_alt_gp_smi_status());
dump_tco_status(reset_tco_status());
/* Disable GPE0 PME_B0 */
gpe0_en = inl(pmbase + GPE0_EN);
gpe0_en &= ~PME_B0_EN;
outl(gpe0_en, pmbase + GPE0_EN);
pm1_en = 0;
pm1_en |= PWRBTN_EN;
pm1_en |= GBL_EN;
outw(pm1_en, pmbase + PM1_EN);
/* Enable SMI generation:
* - on TCO events
* - on APMC writes (io 0xb2)
* - on writes to SLP_EN (sleep states)
* - on writes to GBL_RLS (bios commands)
* No SMIs:
* - on microcontroller writes (io 0x62/0x66)
*/
smi_en = 0; /* reset SMI enables */
#if 0
smi_en |= LEGACY_USB2_EN | LEGACY_USB_EN;
#endif
smi_en |= TCO_EN;
smi_en |= APMC_EN;
#if DEBUG_PERIODIC_SMIS
/* Set DEBUG_PERIODIC_SMIS in pch.h to debug using
* periodic SMIs.
*/
smi_en |= PERIODIC_EN;
#endif
smi_en |= SLP_SMI_EN;
#if 0
smi_en |= BIOS_EN;
#endif
/* The following need to be on for SMIs to happen */
smi_en |= EOS | GBL_SMI_EN;
outl(smi_en, pmbase + SMI_EN);
}
void southbridge_trigger_smi(void)
{
/**
* There are several methods of raising a controlled SMI# via
* software, among them:
* - Writes to io 0xb2 (APMC)
* - Writes to the Local Apic ICR with Delivery mode SMI.
*
* Using the local apic is a bit more tricky. According to
* AMD Family 11 Processor BKDG no destination shorthand must be
* used.
* The whole SMM initialization is quite a bit hardware specific, so
* I'm not too worried about the better of the methods at the moment
*/
/* raise an SMI interrupt */
printk(BIOS_SPEW, " ... raise SMI#\n");
outb(0x00, 0xb2);
}
void southbridge_clear_smi_status(void)
{
/* Clear SMI status */
reset_smi_status();
/* Clear PM1 status */
reset_pm1_status();
/* Set EOS bit so other SMIs can occur. */
smi_set_eos();
}
void smm_setup_structures(void *gnvs, void *tcg, void *smi1)
{
/*
* Issue SMI to set the gnvs pointer in SMM.
* tcg and smi1 are unused.
*
* EAX = APM_CNT_GNVS_UPDATE
* EBX = gnvs pointer
* EDX = APM_CNT
*/
asm volatile (
"outb %%al, %%dx\n\t"
: /* ignore result */
: "a" (APM_CNT_GNVS_UPDATE),
"b" ((u32)gnvs),
"d" (APM_CNT)
);
}
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