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ns16550.c revision 1.1.64.1
      1  1.1.64.1    yamt /*	$NetBSD: ns16550.c,v 1.1.64.1 2006/04/11 11:53:44 yamt Exp $	*/
      2       1.1  nonaka 
      3       1.1  nonaka /*-
      4       1.1  nonaka  * Copyright (C) 1995-1997 Gary Thomas (gdt (at) linuxppc.org)
      5       1.1  nonaka  * All rights reserved.
      6       1.1  nonaka  *
      7       1.1  nonaka  * Redistribution and use in source and binary forms, with or without
      8       1.1  nonaka  * modification, are permitted provided that the following conditions
      9       1.1  nonaka  * are met:
     10       1.1  nonaka  * 1. Redistributions of source code must retain the above copyright
     11       1.1  nonaka  *    notice, this list of conditions and the following disclaimer.
     12       1.1  nonaka  * 2. Redistributions in binary form must reproduce the above copyright
     13       1.1  nonaka  *    notice, this list of conditions and the following disclaimer in the
     14       1.1  nonaka  *    documentation and/or other materials provided with the distribution.
     15       1.1  nonaka  * 3. All advertising materials mentioning features or use of this software
     16       1.1  nonaka  *    must display the following acknowledgement:
     17       1.1  nonaka  *      This product includes software developed by Gary Thomas.
     18       1.1  nonaka  * 4. The name of the author may not be used to endorse or promote products
     19       1.1  nonaka  *    derived from this software without specific prior written permission.
     20       1.1  nonaka  *
     21       1.1  nonaka  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     22       1.1  nonaka  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     23       1.1  nonaka  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     24       1.1  nonaka  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     25       1.1  nonaka  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     26       1.1  nonaka  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     27       1.1  nonaka  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     28       1.1  nonaka  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29       1.1  nonaka  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     30       1.1  nonaka  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31       1.1  nonaka  */
     32       1.1  nonaka 
     33       1.1  nonaka #ifdef CONS_SERIAL
     34       1.1  nonaka /*
     35       1.1  nonaka  * NS16550 support
     36       1.1  nonaka  */
     37       1.1  nonaka 
     38       1.1  nonaka #include <lib/libsa/stand.h>
     39       1.1  nonaka #include "boot.h"
     40       1.1  nonaka #include "ns16550.h"
     41       1.1  nonaka 
     42       1.1  nonaka volatile struct NS16550 *
     43  1.1.64.1    yamt NS16550_init(int addr, int speed)
     44       1.1  nonaka {
     45       1.1  nonaka 	struct NS16550 *com_port;
     46       1.1  nonaka 
     47       1.1  nonaka 	com_port = (struct NS16550 *)(COMBASE + addr);
     48       1.1  nonaka 
     49       1.1  nonaka 	com_port->lcr = 0x80;  /* Access baud rate */
     50       1.1  nonaka 	speed = comspeed(speed);
     51       1.1  nonaka 	com_port->dll = speed;
     52       1.1  nonaka 	com_port->dlm = speed >> 8;
     53       1.1  nonaka 
     54       1.1  nonaka 	com_port->lcr = 0x03;  /* 8 data, 1 stop, no parity */
     55       1.1  nonaka 	com_port->mcr = 0x00;
     56       1.1  nonaka 	com_port->fcr = 0x07;  /* Clear & enable FIFOs */
     57       1.1  nonaka 	com_port->ier = 0x00;
     58       1.1  nonaka 
     59       1.1  nonaka 	return (com_port);
     60       1.1  nonaka }
     61       1.1  nonaka 
     62       1.1  nonaka void
     63  1.1.64.1    yamt NS16550_putc(volatile struct NS16550 *com_port, int c)
     64       1.1  nonaka {
     65       1.1  nonaka 
     66       1.1  nonaka 	while ((com_port->lsr & LSR_THRE) == 0)
     67       1.1  nonaka 		;
     68       1.1  nonaka 	com_port->thr = c;
     69       1.1  nonaka }
     70       1.1  nonaka 
     71       1.1  nonaka int
     72  1.1.64.1    yamt NS16550_getc(volatile struct NS16550 *com_port)
     73       1.1  nonaka {
     74       1.1  nonaka 
     75       1.1  nonaka 	while ((com_port->lsr & LSR_DR) == 0)
     76       1.1  nonaka 		;
     77       1.1  nonaka 	return (com_port->rbr);
     78       1.1  nonaka }
     79       1.1  nonaka 
     80       1.1  nonaka int
     81  1.1.64.1    yamt NS16550_scankbd(volatile struct NS16550 *com_port)
     82       1.1  nonaka {
     83       1.1  nonaka 
     84       1.1  nonaka 	if ((com_port->lsr & LSR_DR) == 0)
     85       1.1  nonaka 		return -1;
     86       1.1  nonaka 	return (com_port->rbr);
     87       1.1  nonaka }
     88       1.1  nonaka 
     89       1.1  nonaka int
     90  1.1.64.1    yamt NS16550_test(volatile struct NS16550 *com_port)
     91       1.1  nonaka {
     92       1.1  nonaka 
     93  1.1.64.1    yamt 	return ((com_port->lsr & LSR_DR) != 0);
     94       1.1  nonaka }
     95       1.1  nonaka #endif /* CONS_SERIAL */
     96