c70eed1e62
Change-Id: Icf34b39d80f6e46d32a39b68f38fb2752c0bcebc Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com> Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr> Reviewed-on: https://review.coreboot.org/c/26484 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Piotr Król <piotr.krol@3mdeb.com> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2007-2009 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <types.h>
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#include <string.h>
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#include <arch/acpi.h>
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#include <arch/acpigen.h>
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#include <device/device.h>
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#include <device/pci.h>
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#include "i945.h"
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unsigned long acpi_fill_mcfg(unsigned long current)
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{
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struct device *dev;
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u32 pciexbar = 0;
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u32 pciexbar_reg;
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int max_buses;
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dev = pcidev_on_root(0, 0);
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if (!dev)
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return current;
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pciexbar_reg = pci_read_config32(dev, PCIEXBAR);
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// MMCFG not supported or not enabled.
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if (!(pciexbar_reg & (1 << 0)))
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return current;
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switch ((pciexbar_reg >> 1) & 3) {
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case 0: // 256MB
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pciexbar = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28));
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max_buses = 256;
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break;
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case 1: // 128M
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pciexbar = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28)|(1 << 27));
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max_buses = 128;
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break;
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case 2: // 64M
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pciexbar = pciexbar_reg & ((1 << 31)|(1 << 30)|(1 << 29)|(1 << 28)|(1 << 27)|(1 << 26));
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max_buses = 64;
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break;
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default: // RSVD
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return current;
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}
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if (!pciexbar)
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return current;
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current += acpi_create_mcfg_mmconfig((acpi_mcfg_mmconfig_t *) current,
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pciexbar, 0x0, 0x0, max_buses - 1);
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return current;
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}
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