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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org>
*
* 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, or (at your option)
* any later verion 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 <device/pci_ids.h>
#include <device/pci_ops.h>
#include "opregion.h"
/* Write ASLS PCI register and prepare SWSCI register. */
void intel_gma_opregion_register(uintptr_t opregion)
{
device_t igd;
u16 reg16;
igd = dev_find_slot(0, PCI_DEVFN(0x2, 0));
if (!igd || !igd->enabled)
return;
/*
* Intel BIOS Specification
* Chapter 5.3.7 "Initialize Hardware State"
*/
pci_write_config32(igd, ASLS, opregion);
/*
* Intel's Windows driver relies on this:
* Intel BIOS Specification
* Chapter 5.4 "ASL Software SCI Handler"
*/
reg16 = pci_read_config16(igd, SWSCI);
reg16 &= ~GSSCIE;
reg16 |= SMISCISEL;
pci_write_config16(igd, SWSCI, reg16);
}
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