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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <arch/bootblock.h>
#include <device/pci_ops.h>
#include "gm45.h"
void bootblock_early_northbridge_init(void)
{
uint32_t reg;
/*
* The "io" variant of the config access is explicitly used to
* setup the PCIEXBAR because CONFIG_MMCONF_SUPPORT is set to
* to true. That way all subsequent non-explicit config accesses use
* MCFG. This code also assumes that bootblock_northbridge_init() is
* the first thing called in the non-asm boot block code. The final
* assumption is that no assembly code is using the
* CONFIG_MMCONF_SUPPORT option to do PCI config accesses.
*
* The PCIEXBAR is assumed to live in the memory mapped IO space under
* 4GiB.
*/
reg = 0;
pci_io_write_config32(PCI_DEV(0,0,0), D0F0_PCIEXBAR_HI, reg);
reg = CONFIG_MMCONF_BASE_ADDRESS | (2 << 1) | 1; /* 64MiB - 0-63 buses. */
pci_io_write_config32(PCI_DEV(0,0,0), D0F0_PCIEXBAR_LO, reg);
}
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