uart_bitbang.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/uart.h>
#include <gpio.h>
#include <boot/coreboot_tables.h>
#include <soc/uart.h>
 
void uart_fill_lb(void *data)
{
 
}
 
static void set_tx(int line_state)
{
        gpio_set(UART_TX_PIN, line_state);
}
 
void uart_init(unsigned int idx)
{
        gpio_output(UART_TX_PIN, 1);
}
 
void uart_tx_byte(unsigned int idx, unsigned char data)
{
        uart_bitbang_tx_byte(data, set_tx);
}
 
void uart_tx_flush(unsigned int idx)
{
        /* unnecessary, PIO Tx means transaction is over when tx_byte returns */
}
 
unsigned char uart_rx_byte(unsigned int idx)
{
        return 0;       /* not implemented */
}