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ns16550.c revision 1.3 
      1 /*	$NetBSD: ns16550.c,v 1.3 1999/02/15 04:38:06 sakamoto Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1995-1997 Gary Thomas (gdt (at) linuxppc.org)
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Gary Thomas.
     18  * 4. The name of the author may not be used to endorse or promote products
     19  *    derived from this software without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifdef CONS_SERIAL
     34 /*
     35  * NS16550 support
     36  */
     37 
     38 #include <bebox/include/bootinfo.h>
     39 #include "ns16550.h"
     40 
     41 volatile struct NS16550 *
     42 NS16550_init()
     43 {
     44 	volatile struct NS16550 *com_port;
     45 	int speed;
     46 	extern struct btinfo_console btinfo_console;
     47 
     48 	com_port = (struct NS16550 *)(COMBASE + btinfo_console.addr);
     49 
     50 	com_port->lcr = 0x80;  /* Access baud rate */
     51 	speed = comspeed(btinfo_console.speed);
     52 	com_port->dll = speed;
     53 	com_port->dlm = speed >> 8;
     54 
     55 	com_port->lcr = 0x03;  /* 8 data, 1 stop, no parity */
     56 	com_port->mcr = 0x00;
     57 	com_port->fcr = 0x07;  /* Clear & enable FIFOs */
     58 	com_port->ier = 0x00;
     59 	return (com_port);
     60 }
     61 
     62 
     63 NS16550_putc(volatile struct NS16550 *com_port, unsigned char c)
     64 {
     65 	volatile int i;
     66 	while ((com_port->lsr & LSR_THRE) == 0) ;
     67 	com_port->thr = c;
     68 }
     69 
     70 unsigned char NS16550_getc(volatile struct NS16550 *com_port)
     71 {
     72 	while ((com_port->lsr & LSR_DR) == 0) ;
     73 	return (com_port->rbr);
     74 }
     75 
     76 int NS16550_scankbd(volatile struct NS16550 *com_port)
     77 {
     78 	if ((com_port->lsr & LSR_DR) == 0)
     79 		return -1;
     80 	return (com_port->rbr);
     81 }
     82 
     83 NS16550_test(volatile struct NS16550 *com_port)
     84 {
     85 	return ((com_port->lsr & LSR_DR) != 0);
     86 }
     87 #endif /* CONS_SERIAL */
     88