| /* |
| * 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); |
| } |