/* $NetBSD: ns16550.c,v 1.1 2007/12/17 19:09:52 garbled Exp $ */
/*-
* Copyright (C) 1995-1997 Gary Thomas (
[email protected])
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gary Thomas.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifdef CONS_SERIAL
/*
* NS16550 support
*/
#include <lib/libsa/stand.h>
#include "boot.h"
#include "ns16550.h"
volatile struct NS16550 *
NS16550_init(int addr, int speed)
{
struct NS16550 *com_port;
com_port = (struct NS16550 *)(COMBASE + addr);
com_port->lcr = 0x80; /* Access baud rate */
speed = comspeed(speed);
com_port->dll = speed;
com_port->dlm = (speed >> 8) & 0xff;
com_port->lcr = 0x03; /* 8 data, 1 stop, no parity */
com_port->mcr = 0x00;
com_port->fcr = 0x07; /* Clear & enable FIFOs */
com_port->ier = 0x00; /* enable no interrupts */
return (com_port);
}
void
NS16550_putc(volatile struct NS16550 *com_port, int c)
{
while ((com_port->lsr & LSR_THRE) == 0)
;
com_port->thr = c;
}
int
NS16550_getc(volatile struct NS16550 *com_port)
{
while ((com_port->lsr & LSR_DR) == 0)
;
return (com_port->rbr);
}
int
NS16550_scankbd(volatile struct NS16550 *com_port)
{
if ((com_port->lsr & LSR_DR) == 0)
return -1;
return (com_port->rbr);
}
int
NS16550_test(volatile struct NS16550 *com_port)
{
return ((com_port->lsr & LSR_DR) != 0);
}
#endif /* CONS_SERIAL */
