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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google Inc.
*
* 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.
*/
#include <device/device.h>
#include <device/pci.h>
#include <console/console.h>
#include <arch/io.h>
#include <cpu/x86/smm.h>
#include <string.h>
#include <soc/iomap.h>
#include <soc/pmc.h>
#include <soc/smm.h>
/* Save the gpio route register. The settings are committed from
* southcluster_smm_enable_smi(). */
static uint32_t gpio_route;
void southcluster_smm_save_gpio_route(uint32_t route)
{
gpio_route = route;
}
void southcluster_smm_clear_state(void)
{
uint32_t smi_en;
/* Log events from chipset before clearing */
southcluster_log_state();
printk(BIOS_DEBUG, "Initializing Southbridge SMI...");
printk(BIOS_SPEW, " pmbase = 0x%04x\n", get_pmbase());
smi_en = inl(get_pmbase() + SMI_EN);
if (smi_en & APMC_EN) {
printk(BIOS_INFO, "SMI# handler already enabled?\n");
return;
}
/* Dump and clear status registers */
clear_smi_status();
clear_pm1_status();
clear_tco_status();
clear_gpe_status();
clear_alt_status();
clear_pmc_status();
}
static void southcluster_smm_route_gpios(void)
{
u32 *gpio_rout = (u32 *)(PMC_BASE_ADDRESS + GPIO_ROUT);
const unsigned short alt_gpio_smi = ACPI_BASE_ADDRESS + ALT_GPIO_SMI;
uint32_t alt_gpio_reg = 0;
uint32_t route_reg = gpio_route;
int i;
printk(BIOS_DEBUG, "GPIO_ROUT = %08x\n", route_reg);
/* Start the routing for the specific gpios. */
write32(gpio_rout, route_reg);
/* Enable SMIs for the gpios that are set to trigger the SMI. */
for (i = 0; i < 16; i++) {
if ((route_reg & ROUTE_MASK) == ROUTE_SMI) {
alt_gpio_reg |= (1 << i);
}
route_reg >>= 2;
}
printk(BIOS_DEBUG, "ALT_GPIO_SMI = %08x\n", alt_gpio_reg);
outl(alt_gpio_reg, alt_gpio_smi);
}
void southcluster_smm_enable_smi(void)
{
printk(BIOS_DEBUG, "Enabling SMIs.\n");
/* Configure events Disable pcie wake. */
enable_pm1(PWRBTN_EN | GBL_EN | PCIEXPWAK_DIS);
disable_gpe(PME_B0_EN);
/* Set up the GPIO route. */
southcluster_smm_route_gpios();
/* Enable SMI generation:
* - on APMC writes (io 0xb2)
* - on writes to SLP_EN (sleep states)
* - on writes to GBL_RLS (bios commands)
* No SMIs:
* - on TCO events
* - on microcontroller writes (io 0x62/0x66)
*/
enable_smi(APMC_EN | SLP_SMI_EN | GBL_SMI_EN | 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" ((uint32_t)gnvs),
"d" (APM_CNT)
);
}
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