diff options
Diffstat (limited to 'sysdeps/standalone/m68k/m68020/mvme136/console.c')
| -rw-r--r-- | sysdeps/standalone/m68k/m68020/mvme136/console.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/sysdeps/standalone/m68k/m68020/mvme136/console.c b/sysdeps/standalone/m68k/m68020/mvme136/console.c new file mode 100644 index 0000000000..159070bab9 --- /dev/null +++ b/sysdeps/standalone/m68k/m68020/mvme136/console.c @@ -0,0 +1,101 @@ +/* Copyright (C) 1994 Free Software Foundation, Inc. + Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), + On-Line Applications Research Corporation. + +This file is part of the GNU C Library. + +The GNU C Library is free software; you can redistribute it and/or +modify it under the terms of the GNU Library General Public License as +published by the Free Software Foundation; either version 2 of the +License, or (at your option) any later version. + +The GNU C Library is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +Library General Public License for more details. + +You should have received a copy of the GNU Library General Public +License along with the GNU C Library; see the file COPYING.LIB. If +not, write to the Free Software Foundation, Inc., 675 Mass Ave, +Cambridge, MA 02139, USA. */ + +#include <ansidecl.h> +#include <standalone.h> +#include "m68020.h" + +/* Console IO routines for a Motorola MVME135/MVME136 board. + +They currently use the B port. It should be possible to +use the A port by filling in the reset of the chip structure, +adding an ifdef for PORTA/PORTB, and switching the addresses, +and maybe the macroes based on the macro. */ + +/* M68681 DUART chip register structures and constants */ + +typedef struct { + volatile unsigned char fill1[ 5 ]; /* channel A regs ( not used ) */ + volatile unsigned char isr; /* interrupt status reg */ + volatile unsigned char fill2[ 2 ]; /* counter regs (not used) */ + volatile unsigned char mr1mr2b; /* MR1B and MR2B regs */ + volatile unsigned char srb; /* status reg channel B */ + volatile unsigned char fill3; /* do not access */ + volatile unsigned char rbb; /* receive buffer channel B */ + volatile unsigned char ivr; /* interrupt vector register */ +} r_m681_info; + +typedef struct { + volatile unsigned char fill1[ 4 ]; /* channel A regs (not used) */ + volatile unsigned char acr; /* auxillary control reg */ + volatile unsigned char imr; /* interrupt mask reg */ + volatile unsigned char fill2[ 2 ]; /* counter regs (not used) */ + volatile unsigned char mr1mr2b; /* MR1B and MR2B regs */ + volatile unsigned char csrb; /* clock select reg */ + volatile unsigned char crb; /* command reg */ + volatile unsigned char tbb; /* transmit buffer channel B */ + volatile unsigned char ivr; /* interrupt vector register */ +} w_m681_info; + +#define RD_M68681 ((r_m681_info *)0xfffb0040) /* ptr to the M68681 */ +#define WR_M68681 ((w_m681_info *)0xfffb0040) /* ptr to the M68681 */ +#define RXRDYB 0x01 /* status reg recv ready mask */ +#define TXRDYB 0x04 /* status reg trans ready mask */ + +/* _Console_Putc + +This routine transmits a character out the M68681. It supports +XON/XOFF flow control. */ + +#define XON 0x11 /* control-Q */ +#define XOFF 0x13 /* control-S */ + +int +DEFUN( _Console_Putc, (ch), char ch ) +{ + while ( ! (RD_M68681->srb & TXRDYB) ) ; + while ( RD_M68681->srb & RXRDYB ) /* must be an XOFF */ + if ( RD_M68681->rbb == XOFF ) + do { + while ( ! (RD_M68681->srb & RXRDYB) ) ; + } while ( RD_M68681->rbb != XON ); + + WR_M68681->tbb = ch; + return( 0 ); +} + +/* _Console_Getc + +This routine reads a character from the UART and returns it. */ + +int +DEFUN( _Console_Getc, (poll), int poll ) +{ + if ( poll ) { + if ( !(RD_M68681->srb & RXRDYB) ) + return -1; + else + return RD_M68681->rbb; + } else { + while ( !(RD_M68681->srb & RXRDYB) ); + return RD_M68681->rbb; + } +} |