com_init.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <bootblock_common.h>
#include <device/mmio.h>
#include <device/pci_ops.h>
#include <soc/gpio.h>
#include <soc/lpc.h>
#include <soc/pci_devs.h>
 
void bootblock_mainboard_early_init(void)
{
        uint32_t reg;
        uint32_t *pad_config_reg;
 
        /* Enable the UART hardware for COM1. */
        reg = 1;
        pci_write_config32(PCI_DEV(0, LPC_DEV, 0), UART_CONT, reg);
 
        /*
         * Set up the pads to select the UART function
         * AD12 SW16(UART1_DATAIN/UART0_DATAIN)   - Set Mode 2 for UART0_RXD
         * AD10 SW20(UART1_DATAOUT/UART0_DATAOUT) - Set Mode 2 for UART0_TXD
         */
        pad_config_reg = gpio_pad_config_reg(GP_SOUTHWEST, UART1_RXD_PAD);
        write32(pad_config_reg, SET_PAD_MODE_SELECTION(PAD_CONFIG0_DEFAULT0,
                M2));
 
        pad_config_reg = gpio_pad_config_reg(GP_SOUTHWEST, UART1_TXD_PAD);
        write32(pad_config_reg, SET_PAD_MODE_SELECTION(PAD_CONFIG0_DEFAULT0,
                M2));
}