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102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
/* Copyright (C) 1994 Free Software Foundation, Inc.
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Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
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On-Line Applications Research Corporation.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <standalone.h>
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#include "m68020.h"
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/* Console IO routines for a Motorola MVME135/MVME136 board.
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They currently use the B port. It should be possible to
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use the A port by filling in the reset of the chip structure,
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adding an ifdef for PORTA/PORTB, and switching the addresses,
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and maybe the macroes based on the macro. */
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/* M68681 DUART chip register structures and constants */
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typedef struct {
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volatile unsigned char fill1[ 5 ]; /* channel A regs ( not used ) */
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volatile unsigned char isr; /* interrupt status reg */
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volatile unsigned char fill2[ 2 ]; /* counter regs (not used) */
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volatile unsigned char mr1mr2b; /* MR1B and MR2B regs */
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volatile unsigned char srb; /* status reg channel B */
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volatile unsigned char fill3; /* do not access */
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volatile unsigned char rbb; /* receive buffer channel B */
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volatile unsigned char ivr; /* interrupt vector register */
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} r_m681_info;
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typedef struct {
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volatile unsigned char fill1[ 4 ]; /* channel A regs (not used) */
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volatile unsigned char acr; /* auxillary control reg */
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volatile unsigned char imr; /* interrupt mask reg */
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volatile unsigned char fill2[ 2 ]; /* counter regs (not used) */
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volatile unsigned char mr1mr2b; /* MR1B and MR2B regs */
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volatile unsigned char csrb; /* clock select reg */
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volatile unsigned char crb; /* command reg */
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volatile unsigned char tbb; /* transmit buffer channel B */
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volatile unsigned char ivr; /* interrupt vector register */
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} w_m681_info;
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#define RD_M68681 ((r_m681_info *)0xfffb0040) /* ptr to the M68681 */
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#define WR_M68681 ((w_m681_info *)0xfffb0040) /* ptr to the M68681 */
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#define RXRDYB 0x01 /* status reg recv ready mask */
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#define TXRDYB 0x04 /* status reg trans ready mask */
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/* _Console_Putc
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This routine transmits a character out the M68681. It supports
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XON/XOFF flow control. */
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#define XON 0x11 /* control-Q */
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#define XOFF 0x13 /* control-S */
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int
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DEFUN( _Console_Putc, (ch), char ch )
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{
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while ( ! (RD_M68681->srb & TXRDYB) ) ;
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while ( RD_M68681->srb & RXRDYB ) /* must be an XOFF */
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if ( RD_M68681->rbb == XOFF )
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do {
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while ( ! (RD_M68681->srb & RXRDYB) ) ;
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} while ( RD_M68681->rbb != XON );
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WR_M68681->tbb = ch;
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return( 0 );
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}
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/* _Console_Getc
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This routine reads a character from the UART and returns it. */
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int
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DEFUN( _Console_Getc, (poll), int poll )
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{
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if ( poll ) {
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if ( !(RD_M68681->srb & RXRDYB) )
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return -1;
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else
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return RD_M68681->rbb;
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} else {
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while ( !(RD_M68681->srb & RXRDYB) );
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return RD_M68681->rbb;
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}
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}
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