src/console/uart8250_console.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2003 Eric Biederman
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; version 2 of the License.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 #include <console/console.h>
  21 #include <uart8250.h>
  22 #include <pc80/mc146818rtc.h>
  23
  24 static void ttyS0_init(void)
  25 {
  26         static const unsigned char div[8] = { 1, 2, 3, 6, 12, 24, 48, 96 };
  27         int b_index = 0;
  28         unsigned int divisor = CONFIG_TTYS0_DIV;
  29
  30         if (get_option(&b_index, "baud_rate") == 0) {
  31                 divisor = div[b_index];
  32         }
  33         uart8250_init(CONFIG_TTYS0_BASE, divisor);
  34 }
  35
  36 static void ttyS0_tx_byte(unsigned char data)
  37 {
  38         uart8250_tx_byte(CONFIG_TTYS0_BASE, data);
  39 }
  40
  41 static unsigned char ttyS0_rx_byte(void)
  42 {
  43         return uart8250_rx_byte(CONFIG_TTYS0_BASE);
  44 }
  45
  46 static int ttyS0_tst_byte(void)
  47 {
  48         return uart8250_can_rx_byte(CONFIG_TTYS0_BASE);
  49 }
  50
  51 static const struct console_driver uart8250_console __console = {
  52         .init     = ttyS0_init,
  53         .tx_byte  = ttyS0_tx_byte,
  54         .rx_byte  = ttyS0_rx_byte,
  55         .tst_byte = ttyS0_tst_byte,
  56 };