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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015 secunet Security Networks AG
*
* 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 <stdint.h>
#include <arch/io.h>
#include <device/device.h>
#include <device/pci_def.h>
#include "sandybridge.h"
void sandybridge_init_iommu(void)
{
const u32 capid0_a = pci_read_config32(PCI_DEV(0, 0, 0), 0xe4);
if (capid0_a & (1 << 23))
return;
/* setup BARs */
MCHBAR32(0x5404) = IOMMU_BASE1 >> 32;
MCHBAR32(0x5400) = IOMMU_BASE1 | 1;
MCHBAR32(0x5414) = IOMMU_BASE2 >> 32;
MCHBAR32(0x5410) = IOMMU_BASE2 | 1;
/* lock policies */
write32((void *)(IOMMU_BASE1 + 0xff0), 0x80000000);
const struct device *const azalia = pcidev_on_root(0x1b, 0);
if (azalia && azalia->enabled) {
write32((void *)(IOMMU_BASE2 + 0xff0), 0x20000000);
write32((void *)(IOMMU_BASE2 + 0xff0), 0xa0000000);
} else {
write32((void *)(IOMMU_BASE2 + 0xff0), 0x80000000);
}
}
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