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/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/bootblock.h>
#include <assert.h>
#include <device/pci_ops.h>
#include <types.h>
#include "ironlake.h"
static uint32_t encode_pciexbar_length(void)
{
/* NOTE: Ironlake uses a different encoding for the PCIEXBAR length field */
switch (CONFIG_ECAM_MMCONF_BUS_NUMBER) {
case 256: return 0 << 1;
case 128: return 6 << 1;
case 64: return 7 << 1;
default: return dead_code_t(uint32_t);
}
}
void bootblock_early_northbridge_init(void)
{
/*
* The QuickPath bus number is the topmost bus number, as per the value
* of the SAD_PCIEXBAR register. The register defaults to 256 buses on
* reset. Thus, hardcode the bus number when first setting up PCIEXBAR.
*/
const pci_devfn_t qpi_sad = PCI_DEV(255, 0, 1);
const uint32_t reg32 = CONFIG_ECAM_MMCONF_BASE_ADDRESS | encode_pciexbar_length() | 1;
pci_io_write_config32(qpi_sad, SAD_PCIEXBAR + 4, 0);
pci_io_write_config32(qpi_sad, SAD_PCIEXBAR, reg32);
}
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