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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 "pch.h"
/*
* Enable Prefetching and Caching.
*/
static void enable_spi_prefetch(void)
{
u8 reg8;
pci_devfn_t dev = PCH_LPC_DEV;
reg8 = pci_read_config8(dev, BIOS_CNTL);
reg8 &= ~(3 << 2);
reg8 |= (2 << 2); /* Prefetching and Caching Enabled */
pci_write_config8(dev, BIOS_CNTL, reg8);
}
static void enable_port80_on_lpc(void)
{
/* Enable port 80 POST on LPC */
RCBA32(GCS) &= (~0x04);
}
static void set_spi_speed(void)
{
u32 fdod;
u8 ssfc;
/* Observe SPI Descriptor Component Section 0 */
RCBA32(0x38b0) = 0x1000;
/* Extract the Write/Erase SPI Frequency from descriptor */
fdod = RCBA32(0x38b4);
fdod >>= 24;
fdod &= 7;
/* Set Software Sequence frequency to match */
ssfc = RCBA8(0x3893);
ssfc &= ~7;
ssfc |= fdod;
RCBA8(0x3893) = ssfc;
}
void bootblock_early_southbridge_init(void)
{
enable_spi_prefetch();
early_pch_init();
enable_port80_on_lpc();
set_spi_speed();
/* Enable upper 128bytes of CMOS */
RCBA32(RC) = (1 << 2);
}
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