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/*
* This file contains the hardware specific portions of the TTY driver
* for the serial ports on the jmr3904.
*
* Logic based on the jmr3904-io.c file in newlib 1.8.2
*
* COPYRIGHT (c) 1989-2000.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <assert.h>
/* external prototypes for monitor interface routines */
void outbyte( char );
char inbyte( void );
#define READ_UINT8( _register_, _value_ ) \
((_value_) = *((volatile unsigned char *)(_register_)))
#define WRITE_UINT8( _register_, _value_ ) \
(*((volatile unsigned char *)(_register_)) = (_value_))
#define READ_UINT16( _register_, _value_ ) \
((_value_) = *((volatile unsigned short *)(_register_)))
#define WRITE_UINT16( _register_, _value_ ) \
(*((volatile unsigned short *)(_register_)) = (_value_))
/* - Board specific addresses for serial chip */
#define DIAG_BASE 0xfffff300
#define DIAG_SLCR (DIAG_BASE+0x00)
#define DIAG_SLSR (DIAG_BASE+0x04)
#define DIAG_SLDICR (DIAG_BASE+0x08)
#define DIAG_SLDISR (DIAG_BASE+0x0C)
#define DIAG_SFCR (DIAG_BASE+0x10)
#define DIAG_SBRG (DIAG_BASE+0x14)
#define DIAG_TFIFO (DIAG_BASE+0x20)
#define DIAG_RFIFO (DIAG_BASE+0x30)
#define BRG_T0 0x0000
#define BRG_T2 0x0100
#define BRG_T4 0x0200
#define BRG_T5 0x0300
/*
* Eventually console-polled.c should hook to this better.
*/
static char initialized = 0;
void board_serial_init (void)
{
initialized = 1;
WRITE_UINT16 (DIAG_SLCR, 0x0020);
WRITE_UINT16 (DIAG_SLDICR, 0x0000);
WRITE_UINT16 (DIAG_SFCR, 0x0000);
WRITE_UINT16 (DIAG_SBRG, BRG_T2 | 5);
}
/*
* console_outbyte_polled
*
* This routine transmits a character using polling.
*/
void console_outbyte_polled(
int port,
char ch
)
{
unsigned short disr;
if ( !initialized )
board_serial_init();
for (;;)
{
READ_UINT16 (DIAG_SLDISR, disr);
if (disr & 0x0002)
break;
}
disr = disr & ~0x0002;
WRITE_UINT8 (DIAG_TFIFO, (unsigned char) ch);
WRITE_UINT16 (DIAG_SLDISR, disr);
}
/*
* console_inbyte_nonblocking
*
* This routine polls for a character.
*/
int console_inbyte_nonblocking(
int port
)
{
unsigned char c;
unsigned short disr;
if ( !initialized )
board_serial_init();
READ_UINT16 (DIAG_SLDISR, disr);
if (disr & 0x0001) {
disr = disr & ~0x0001;
READ_UINT8 (DIAG_RFIFO, c);
WRITE_UINT16 (DIAG_SLDISR, disr);
return (char) c;
}
return -1;
}
#include <bspIo.h>
void JMR3904_output_char(char c) { console_outbyte_polled( 0, c ); }
BSP_output_char_function_type BSP_output_char = JMR3904_output_char;
BSP_polling_getchar_function_type BSP_poll_char = NULL;
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