/*
* This file contains the TTY driver for the serial ports on the DMV152.
* The serial ports use a Zilog Z8530.
*
* NOTE: This driver uses the termios pseudo driver.
* This driver is polled only.
*
* COPYRIGHT (c) 1989-1999.
* 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>
/*
* console_outbyte_polled
*
* This routine transmits a character using polling.
*/
void console_outbyte_polled(
int port,
char ch
)
{
rtems_unsigned32 control;
rtems_unsigned32 data;
rtems_unsigned8 rr_0;
if ( port == 0 ) {
control = CONSOLE_CONTROL_A;
data = CONSOLE_DATA_A;
} else {
control = CONSOLE_CONTROL_B;
data = CONSOLE_DATA_B;
}
for ( ; ; ) {
Z8x30_READ_CONTROL( control, RR_0, rr_0 );
if ( (rr_0 & RR_0_TX_BUFFER_EMPTY) != 0 )
break;
}
Z8x30_WRITE_DATA( control, ch );
}
/*
* console_inbyte_nonblocking
*
* This routine polls for a character.
*/
int console_inbyte_nonblocking(int port)
{
rtems_unsigned32 control;
rtems_unsigned32 data;
rtems_unsigned8 rr_0;
char ch;
if ( port == 0 ) {
control = CONSOLE_CONTROL_A;
data = CONSOLE_DATA_A;
} else {
control = CONSOLE_CONTROL_B;
data = CONSOLE_DATA_B;
}
Z8x30_READ_CONTROL( control, RR_0, rr_0 );
if ( !(rr_0 & RR_0_RX_DATA_AVAILABLE) )
return -1;
Z8x30_READ_DATA( data, ch );
return (int) ch;
}
/*
* DEBUG_puts
*
* This should be safe in the event of an error. It attempts to insure
* that no TX empty interrupts occur while it is doing polled IO. Then
* it restores the state of that external interrupt.
*
* Input parameters:
* string - pointer to debug output string
*
* Output parameters: NONE
*
* Return values: NONE
*/
void DEBUG_puts(
char *string
)
{
char *s;
/* should disable interrupts here */
for ( s = string ; *s ; s++ )
console_outbyte_polled( 0, *s );
console_outbyte_polled( 0, '\r' );
console_outbyte_polled( 0, '\n' );
/* should enable interrupts here */
}
/*
* Console Termios Support Entry Points
*
*/
int console_write_support (int minor, const char *buf, int len)
{
int nwrite = 0;
while (nwrite < len) {
console_outbyte_polled( minor, *buf++ );
nwrite++;
}
return nwrite;
}
/*
* Console Device Driver Entry Points
*
*/
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
rtems_device_minor_number console_minor;
rtems_termios_initialize();
/*
* Register Device Names
*/
#if (USE_CHANNEL_A == 1)
console_minor = 0;
#elif (USE_CHANNEL_B == 1)
console_minor = 1;
#else
#error "DMV152 Console Driver -- no console port configured!!!"
#endif
status = rtems_io_register_name( "/dev/console", major, console_minor );
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
status = rtems_io_register_name( "/dev/console_a", major, 0 );
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
status = rtems_io_register_name( "/dev/console_b", major, 1 );
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
/*
* Initialize Hardware
*/
return RTEMS_SUCCESSFUL;
}
rtems_device_driver console_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
rtems_status_code sc;
static const rtems_termios_callbacks pollCallbacks = {
NULL, /* firstOpen */
NULL, /* lastClose */
console_inbyte_nonblocking, /* pollRead */
console_write_support, /* write */
NULL, /* setAttributes */
NULL, /* stopRemoteTx */
NULL, /* startRemoteTx */
0 /* outputUsesInterrupts */
};
assert( minor <= 1 );
if ( minor > 2 )
return RTEMS_INVALID_NUMBER;
sc = rtems_termios_open (major, minor, arg, &pollCallbacks );
return RTEMS_SUCCESSFUL;
}
rtems_device_driver console_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return rtems_termios_close (arg);
}
rtems_device_driver console_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return rtems_termios_read (arg);
}
rtems_device_driver console_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return rtems_termios_write (arg);
}
rtems_device_driver console_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return rtems_termios_ioctl (arg);
}