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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <amdblocks/acpimmio.h>
#include <bootblock_common.h>
#include <stdint.h>
#include <device/pci_ops.h>
#include <superio/ite/common/ite.h>
#include <superio/ite/it8728f/it8728f.h>
#define SERIAL_DEV PNP_DEV(0x2e, IT8728F_SP1)
#define GPIO_DEV PNP_DEV(0x2e, IT8728F_GPIO)
#define CLKIN_DEV PNP_DEV(0x2e, IT8728F_GPIO)
static void sbxxx_enable_48mhzout(void)
{
u32 reg32;
/* Set auxiliary output clock frequency on OSCOUT1 pin to be 48MHz */
reg32 = misc_read32(0x28);
reg32 &= 0xfff8ffff;
misc_write32(0x28, reg32);
/* Enable Auxiliary Clock1, disable FCH 14 MHz OscClk */
reg32 = misc_read32(0x40);
reg32 &= 0xffffbffb;
misc_write32(0x40, reg32);
}
void bootblock_mainboard_early_init(void)
{
u8 byte;
/* Enable the AcpiMmio space */
pm_io_write8(0x24, 1);
/* Set LPC decode enables. */
const pci_devfn_t dev = PCI_DEV(0, 0x14, 3);
pci_write_config32(dev, 0x44, 0xff03ffd5);
/* enable SIO LPC decode */
byte = pci_read_config8(dev, 0x48);
byte |= 3; /* 2e, 2f */
pci_write_config8(dev, 0x48, byte);
/* enable serial decode */
byte = pci_read_config8(dev, 0x44);
byte |= (1 << 6); /* 0x3f8 */
pci_write_config8(dev, 0x44, byte);
/* enable SIO clock */
sbxxx_enable_48mhzout();
/* Enable serial output on it8728f */
ite_conf_clkin(CLKIN_DEV, ITE_UART_CLK_PREDIVIDE_48);
ite_kill_watchdog(GPIO_DEV);
ite_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
}
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