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/******************************************************************************
*
* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
* $Revision: 36 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* 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; either 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "achware.h"
#define _COMPONENT HARDWARE
MODULE_NAME ("hwacpi")
/******************************************************************************
*
* FUNCTION: Acpi_hw_initialize
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Initialize and validate various ACPI registers
*
******************************************************************************/
ACPI_STATUS
acpi_hw_initialize (
void)
{
ACPI_STATUS status = AE_OK;
u32 index;
/* We must have the ACPI tables by the time we get here */
if (!acpi_gbl_FADT) {
acpi_gbl_restore_acpi_chipset = FALSE;
return (AE_NO_ACPI_TABLES);
}
/* Must support *some* mode! */
/*
if (!(System_flags & SYS_MODES_MASK)) {
Restore_acpi_chipset = FALSE;
return (AE_ERROR);
}
*/
switch (acpi_gbl_system_flags & SYS_MODES_MASK)
{
/* Identify current ACPI/legacy mode */
case (SYS_MODE_ACPI):
acpi_gbl_original_mode = SYS_MODE_ACPI;
break;
case (SYS_MODE_LEGACY):
acpi_gbl_original_mode = SYS_MODE_LEGACY;
break;
case (SYS_MODE_ACPI | SYS_MODE_LEGACY):
if (acpi_hw_get_mode () == SYS_MODE_ACPI) {
acpi_gbl_original_mode = SYS_MODE_ACPI;
}
else {
acpi_gbl_original_mode = SYS_MODE_LEGACY;
}
break;
}
if (acpi_gbl_system_flags & SYS_MODE_ACPI) {
/* Target system supports ACPI mode */
/*
* The purpose of this code is to save the initial state
* of the ACPI event enable registers. An exit function will be
* registered which will restore this state when the application
* exits. The exit function will also clear all of the ACPI event
* status bits prior to restoring the original mode.
*
* The location of the PM1a_evt_blk enable registers is defined as the
* base of PM1a_evt_blk + DIV_2(PM1a_evt_blk_length). Since the spec further
* fully defines the PM1a_evt_blk to be a total of 4 bytes, the offset
* for the enable registers is always 2 from the base. It is hard
* coded here. If this changes in the spec, this code will need to
* be modified. The PM1b_evt_blk behaves as expected.
*/
acpi_gbl_pm1_enable_register_save = (u16) acpi_hw_register_read (ACPI_MTX_LOCK, PM1_EN);
/*
* The GPEs behave similarly, except that the length of the register
* block is not fixed, so the buffer must be allocated with malloc
*/
if (ACPI_VALID_ADDRESS (acpi_gbl_FADT->Xgpe0blk.address) &&
acpi_gbl_FADT->gpe0blk_len)
{
/* GPE0 specified in FADT */
acpi_gbl_gpe0enable_register_save =
acpi_cm_allocate (DIV_2 (acpi_gbl_FADT->gpe0blk_len));
if (!acpi_gbl_gpe0enable_register_save) {
return (AE_NO_MEMORY);
}
/* Save state of GPE0 enable bits */
for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe0blk_len); index++) {
acpi_gbl_gpe0enable_register_save[index] =
(u8) acpi_hw_register_read (ACPI_MTX_LOCK, GPE0_EN_BLOCK | index);
}
}
else {
acpi_gbl_gpe0enable_register_save = NULL;
}
if (ACPI_VALID_ADDRESS (acpi_gbl_FADT->Xgpe1_blk.address) &&
acpi_gbl_FADT->gpe1_blk_len)
{
/* GPE1 defined */
acpi_gbl_gpe1_enable_register_save =
acpi_cm_allocate (DIV_2 (acpi_gbl_FADT->gpe1_blk_len));
if (!acpi_gbl_gpe1_enable_register_save) {
return (AE_NO_MEMORY);
}
/* save state of GPE1 enable bits */
for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe1_blk_len); index++) {
acpi_gbl_gpe1_enable_register_save[index] =
(u8) acpi_hw_register_read (ACPI_MTX_LOCK, GPE1_EN_BLOCK | index);
}
}
else {
acpi_gbl_gpe1_enable_register_save = NULL;
}
}
return (status);
}
/******************************************************************************
*
* FUNCTION: Acpi_hw_set_mode
*
* PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
*
* RETURN: Status
*
* DESCRIPTION: Transitions the system into the requested mode or does nothing
* if the system is already in that mode.
*
******************************************************************************/
ACPI_STATUS
acpi_hw_set_mode (
u32 mode)
{
ACPI_STATUS status = AE_ERROR;
if (mode == SYS_MODE_ACPI) {
/* BIOS should have disabled ALL fixed and GP events */
acpi_os_out8 (acpi_gbl_FADT->smi_cmd, acpi_gbl_FADT->acpi_enable);
}
else if (mode == SYS_MODE_LEGACY) {
/*
* BIOS should clear all fixed status bits and restore fixed event
* enable bits to default
*/
acpi_os_out8 (acpi_gbl_FADT->smi_cmd, acpi_gbl_FADT->acpi_disable);
}
if (acpi_hw_get_mode () == mode) {
status = AE_OK;
}
return (status);
}
/******************************************************************************
*
* FUNCTION: Acpi_hw_get_mode
*
* PARAMETERS: none
*
* RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
*
* DESCRIPTION: Return current operating state of system. Determined by
* querying the SCI_EN bit.
*
******************************************************************************/
u32
acpi_hw_get_mode (void)
{
if (acpi_hw_register_bit_access (ACPI_READ, ACPI_MTX_LOCK, SCI_EN)) {
return (SYS_MODE_ACPI);
}
else {
return (SYS_MODE_LEGACY);
}
}
/******************************************************************************
*
* FUNCTION: Acpi_hw_get_mode_capabilities
*
* PARAMETERS: none
*
* RETURN: logical OR of SYS_MODE_ACPI and SYS_MODE_LEGACY determined at initial
* system state.
*
* DESCRIPTION: Returns capablities of system
*
******************************************************************************/
u32
acpi_hw_get_mode_capabilities (void)
{
if (!(acpi_gbl_system_flags & SYS_MODES_MASK)) {
if (acpi_hw_get_mode () == SYS_MODE_LEGACY) {
/*
* Assume that if this call is being made, Acpi_init has been called
* and ACPI support has been established by the presence of the
* tables. Therefore since we're in SYS_MODE_LEGACY, the system
* must support both modes
*/
acpi_gbl_system_flags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
}
else {
/* TBD: [Investigate] !!! this may be unsafe... */
/*
* system is is ACPI mode, so try to switch back to LEGACY to see if
* it is supported
*/
acpi_hw_set_mode (SYS_MODE_LEGACY);
if (acpi_hw_get_mode () == SYS_MODE_LEGACY) {
/* Now in SYS_MODE_LEGACY, so both are supported */
acpi_gbl_system_flags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
acpi_hw_set_mode (SYS_MODE_ACPI);
}
else {
/* Still in SYS_MODE_ACPI so this must be an ACPI only system */
acpi_gbl_system_flags |= SYS_MODE_ACPI;
}
}
}
return (acpi_gbl_system_flags & SYS_MODES_MASK);
}
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