bootblock.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <bootblock_common.h>
#include <device/pci_def.h>
#include <device/pci_ops.h>
#include <intelblocks/lpc_lib.h>
#include <intelblocks/pcr.h>
#include <soc/pci_devs.h>
#include <soc/pcr_ids.h>
#include <superio/aspeed/ast2400/ast2400.h>
#include <superio/aspeed/common/aspeed.h>
#include "include/gpio.h"
 
void bootblock_mainboard_early_init(void)
{
        /* Configure Lewisburg PCH GPIOs */
        gpio_configure_pads(gpio_table, ARRAY_SIZE(gpio_table));
 
        /* Enable COM1 only */
        pcr_write32(PID_DMI, 0x2770, 0);
        pcr_write32(PID_DMI, 0x2774, 1);
 
        /* Decode for SuperIO (0x2e) and COM1 (0x3f8) */
        pci_s_write_config32(PCH_DEV_LPC, 0x80, (1 << 28) | (1 << 16));
 
        const pnp_devfn_t serial_dev = PNP_DEV(0x2e, AST2400_SUART1);
        aspeed_enable_serial(serial_dev, CONFIG_TTYS0_BASE);
}