| /* This file is part of the coreboot project. */ |
| /* |
| * |
| * 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 */ |
| } |