/*
* Copyright (C) 2016 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <unistd.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/io.h>
#include <ipxe/acpi.h>
#include <ipxe/acpipwr.h>
/** @file
*
* ACPI power off
*
*/
/** Colour for debug messages */
#define colour FADT_SIGNATURE
/** _S5_ signature */
#define S5_SIGNATURE ACPI_SIGNATURE ( '_', 'S', '5', '_' )
/**
* Power off the computer using ACPI
*
* @ret rc Return status code
*/
int acpi_poweroff ( void ) {
struct acpi_fadt fadtab;
userptr_t fadt;
unsigned int pm1a_cnt_blk;
unsigned int pm1b_cnt_blk;
unsigned int pm1a_cnt;
unsigned int pm1b_cnt;
unsigned int slp_typa;
unsigned int slp_typb;
int s5;
int rc;
/* Locate FADT */
fadt = acpi_find ( FADT_SIGNATURE, 0 );
if ( ! fadt ) {
DBGC ( colour, "ACPI could not find FADT\n" );
return -ENOENT;
}
/* Read FADT */
copy_from_user ( &fadtab, fadt, 0, sizeof ( fadtab ) );
pm1a_cnt_blk = le32_to_cpu ( fadtab.pm1a_cnt_blk );
pm1b_cnt_blk = le32_to_cpu ( fadtab.pm1b_cnt_blk );
pm1a_cnt = ( pm1a_cnt_blk + ACPI_PM1_CNT );
pm1b_cnt = ( pm1b_cnt_blk + ACPI_PM1_CNT );
/* Extract \_S5 from DSDT or any SSDT */
s5 = acpi_sx ( S5_SIGNATURE );
if ( s5 < 0 ) {
rc = s5;
DBGC ( colour, "ACPI could not extract \\_S5: %s\n",
strerror ( rc ) );
return rc;
}
/* Power off system */
if ( pm1a_cnt_blk ) {
slp_typa = ( ( s5 >> 0 ) & 0xff );
DBGC ( colour, "ACPI PM1a sleep type %#x => %04x\n",
slp_typa, pm1a_cnt );
outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typa ) |
ACPI_PM1_CNT_SLP_EN ), pm1a_cnt );
}
if ( pm1b_cnt_blk ) {
slp_typb = ( ( s5 >> 8 ) & 0xff );
DBGC ( colour, "ACPI PM1b sleep type %#x => %04x\n",
slp_typb, pm1b_cnt );
outw ( ( ACPI_PM1_CNT_SLP_TYP ( slp_typb ) |
ACPI_PM1_CNT_SLP_EN ), pm1b_cnt );
}
/* On some systems, execution will continue briefly. Delay to
* avoid potentially confusing log messages.
*/
mdelay ( 1000 );
DBGC ( colour, "ACPI power off failed\n" );
return -EPROTO;
}
