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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"
#include "chip.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)
{
RCBA32(GCS) &= ~4;
}
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;
}
static void early_lpc_init(void)
{
const struct device *dev = pcidev_on_root(0x1f, 0);
const struct southbridge_intel_ibexpeak_config *config = NULL;
/*
* Enable some common LPC IO ranges:
* - 0x2e/0x2f, 0x4e/0x4f often SuperIO
* - 0x60/0x64, 0x62/0x66 often KBC/EC
* - 0x3f0-0x3f5/0x3f7 FDD
* - 0x378-0x37f and 0x778-0x77f LPT
* - 0x2f8-0x2ff COMB
* - 0x3f8-0x3ff COMA
* - 0x208-0x20f GAMEH
* - 0x200-0x207 GAMEL
*/
pci_write_config16(PCH_LPC_DEV, LPC_EN, CNF2_LPC_EN | CNF1_LPC_EN
| MC_LPC_EN | KBC_LPC_EN | GAMEH_LPC_EN
| GAMEL_LPC_EN | FDD_LPC_EN | LPT_LPC_EN
| COMB_LPC_EN | COMA_LPC_EN);
pci_write_config16(PCH_LPC_DEV, LPC_IO_DEC, 0x10);
/* Clear PWR_FLR */
pci_write_config8(PCH_LPC_DEV, GEN_PMCON_3,
(pci_read_config8(PCH_LPC_DEV, GEN_PMCON_3) & ~2) | 1);
pci_write_config32(PCH_LPC_DEV, ETR3,
pci_read_config32(PCH_LPC_DEV, ETR3) & ~ETR3_CF9GR);
/* Set up generic decode ranges */
if (!dev)
return;
if (dev->chip_info)
config = dev->chip_info;
if (!config)
return;
pci_write_config32(PCH_LPC_DEV, LPC_GEN1_DEC, config->gen1_dec);
pci_write_config32(PCH_LPC_DEV, LPC_GEN2_DEC, config->gen2_dec);
pci_write_config32(PCH_LPC_DEV, LPC_GEN3_DEC, config->gen3_dec);
pci_write_config32(PCH_LPC_DEV, LPC_GEN4_DEC, config->gen4_dec);
}
void bootblock_early_southbridge_init(void)
{
enable_spi_prefetch();
/* Enable RCBA */
pci_devfn_t lpc_dev = PCI_DEV(0, 0x1f, 0);
pci_write_config32(lpc_dev, RCBA, (uintptr_t)DEFAULT_RCBA | 1);
enable_port80_on_lpc();
set_spi_speed();
/* Enable upper 128bytes of CMOS */
RCBA32(RC) = (1 << 2);
early_lpc_init();
}
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