| /* |
| * 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 as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * 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. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc. |
| */ |
| |
| #include <console/console.h> |
| #include <console/uart.h> |
| #if CONFIG_USE_OPTION_TABLE |
| #include <option.h> |
| #include "option_table.h" |
| #endif |
| |
| unsigned int default_baudrate(void) |
| { |
| #if !defined(__SMM__) && CONFIG_USE_OPTION_TABLE |
| static const unsigned baud[8] = |
| { 115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200 }; |
| unsigned b_index = 0; |
| #if defined(__PRE_RAM__) |
| b_index = read_option(baud_rate, 0xff); |
| #else |
| if (get_option(&b_index, "baud_rate") != CB_SUCCESS) |
| b_index = 0xff; |
| #endif |
| if (b_index < 8) |
| return baud[b_index]; |
| #endif |
| return CONFIG_TTYS0_BAUD; |
| } |
| |
| /* Calculate divisor. Do not floor but round to nearest integer. */ |
| unsigned int uart_baudrate_divisor(unsigned int baudrate, |
| unsigned int refclk, unsigned int oversample) |
| { |
| return (1 + (2 * refclk) / (baudrate * oversample)) / 2; |
| } |
