49 lines
1.5 KiB
C
49 lines
1.5 KiB
C
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/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <console/console.h>
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#include <uart.h>
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#if CONFIG_USE_OPTION_TABLE
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#include <pc80/mc146818rtc.h>
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#include "option_table.h"
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#endif
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unsigned int default_baudrate(void)
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{
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#if !defined(__SMM__) && CONFIG_USE_OPTION_TABLE
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static const unsigned baud[8] =
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{ 115200, 57600, 38400, 19200, 9600, 4800, 2400, 1200 };
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unsigned b_index = 0;
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#if defined(__PRE_RAM__)
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b_index = read_option(baud_rate, 0xff);
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#else
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if (get_option(&b_index, "baud_rate") != CB_SUCCESS)
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b_index = 0xff;
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#endif
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if (b_index < 8)
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return baud[b_index];
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#endif
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return CONFIG_TTYS0_BAUD;
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}
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/* Calculate divisor. Do not floor but round to nearest integer. */
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unsigned int uart_baudrate_divisor(unsigned int baudrate,
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unsigned int refclk, unsigned int oversample)
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{
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return (1 + (2 * refclk) / (baudrate * oversample)) / 2;
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}
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