78 lines
2.4 KiB
C
78 lines
2.4 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 Advanced Micro Devices, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <libpayload.h>
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#define IOBASE lib_sysinfo.ser_ioport
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#ifdef CONFIG_SERIAL_SET_SPEED
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#define DIVISOR (115200 / CONFIG_SERIAL_BAUD_RATE)
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#endif
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void serial_init(void)
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{
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#ifdef CONFIG_SERIAL_SET_SPEED
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unsigned char reg;
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/* Disable interrupts. */
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outb(0, IOBASE + 0x01);
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/* Assert RTS and DTR. */
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outb(3, IOBASE + 0x04);
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/* Set the divisor latch. */
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reg = inb(IOBASE + 0x03);
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outb(reg | 0x80, IOBASE + 0x03);
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/* Write the divisor. */
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outb(DIVISOR & 0xFF, IOBASE);
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outb(DIVISOR >> 8 & 0xFF, IOBASE + 1);
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/* Restore the previous value of the divisor. */
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outb(reg &= ~0x80, IOBASE + 0x03);
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#endif
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}
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void serial_putchar(unsigned char c)
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{
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while ((inb(IOBASE + 0x05) & 0x20) == 0) ;
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outb(c, IOBASE);
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}
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int serial_havechar(void)
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{
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return inb(IOBASE + 0x05) & 0x01;
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}
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int serial_getchar(void)
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{
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while (!serial_havechar()) ;
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return (int)inb(IOBASE);
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}
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