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/*
* This file is part of the coreboot project.
*
* Copyright 2018 Google LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <console/uart.h>
#include <gpio.h>
#include <types.h>
#define UART_TX_PIN GPIO(4)
static void set_tx(int line_state)
{
gpio_set(UART_TX_PIN, line_state);
}
void uart_init(int idx)
{
gpio_output(UART_TX_PIN, 1);
}
void uart_tx_byte(int idx, unsigned char data)
{
uart_bitbang_tx_byte(data, set_tx);
}
void uart_tx_flush(int idx)
{
/* unnecessary, PIO Tx means transaction is over when tx_byte returns */
}
unsigned char uart_rx_byte(int idx)
{
return 0; /* not implemented */
}
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