88 lines
2.8 KiB
C
88 lines
2.8 KiB
C
/* $Id: ns16550.c,v 1.2 1998/01/19 03:01:01 sakamoto Exp $ */
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/*-
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* Copyright (C) 1995-1997 Gary Thomas (gdt@linuxppc.org)
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* All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Gary Thomas.
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* 4. 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef CONS_SERIAL
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/*
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* NS16550 support
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*/
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#include <bebox/include/bootinfo.h>
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#include "ns16550.h"
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volatile struct NS16550 *
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NS16550_init()
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{
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volatile struct NS16550 *com_port;
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int speed;
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extern struct btinfo_console btinfo_console;
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com_port = (struct NS16550 *)(COMBASE + btinfo_console.addr);
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com_port->lcr = 0x80; /* Access baud rate */
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speed = comspeed(btinfo_console.speed);
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com_port->dll = speed;
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com_port->dlm = speed >> 8;
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com_port->lcr = 0x03; /* 8 data, 1 stop, no parity */
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com_port->mcr = 0x00;
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com_port->fcr = 0x07; /* Clear & enable FIFOs */
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com_port->ier = 0x00;
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return (com_port);
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}
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NS16550_putc(volatile struct NS16550 *com_port, unsigned char c)
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{
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volatile int i;
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while ((com_port->lsr & LSR_THRE) == 0) ;
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com_port->thr = c;
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}
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unsigned char NS16550_getc(volatile struct NS16550 *com_port)
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{
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while ((com_port->lsr & LSR_DR) == 0) ;
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return (com_port->rbr);
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}
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int NS16550_scankbd(volatile struct NS16550 *com_port)
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{
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if ((com_port->lsr & LSR_DR) == 0)
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return -1;
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return (com_port->rbr);
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}
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NS16550_test(volatile struct NS16550 *com_port)
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{
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return ((com_port->lsr & LSR_DR) != 0);
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}
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#endif /* CONS_SERIAL */
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