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/*
* This file implements simple console IO via JTAG UART.
*
* Based on no_cpu/console.c
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* Altera-specific code is
* COPYRIGHT (c) 2005-2006 Kolja Waschk, rtemsdev/ixo.de
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#define NO_BSP_INIT
#include <bsp.h>
#include <rtems/libio.h>
/* #define JTAG_UART_REGS ((altera_avalon_jtag_uart_regs*)NIOS2_IO_BASE(JTAG_UART_BASE)) */
#if 0
#define XOFFchar 0x13
#define XONchar 0x11
#endif
/* console_initialize
*
* This routine initializes the console IO driver.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
status = rtems_io_register_name(
"/dev/console",
major,
(rtems_device_minor_number) 0
);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
return RTEMS_SUCCESSFUL;
}
/* is_character_ready
*
* If a character is available, this routine reads it and stores
* it in
* reads the character and stores
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
bool is_character_ready(
char *ch
)
{
altera_avalon_jtag_uart_regs *ajur = NIOS2_IO_BASE(JTAG_UART_BASE);
unsigned int data = ajur->data;
if (data & ALTERA_AVALON_JTAG_UART_DATA_RVALID_MSK)
{
*ch = (data & ALTERA_AVALON_JTAG_UART_DATA_DATA_MSK)
>> ALTERA_AVALON_JTAG_UART_DATA_DATA_OFST;
return true;
};
return false;
}
/* inbyte
*
* This routine reads a character from the SOURCE.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
* character read from SOURCE
*/
char inbyte( void )
{
/*
* Wait until a character is available.
*/
char ch;
while(!is_character_ready(&ch));
return ch;
}
/* outbyte
*
* This routine transmits a character out the SOURCE. It may support
* XON/XOFF flow control.
*
* Input parameters:
* ch - character to be transmitted
*
* Output parameters: NONE
*/
void outbyte(
char ch
)
{
altera_avalon_jtag_uart_regs *ajur = NIOS2_IO_BASE(JTAG_UART_BASE);
/*
* Carriage Return/New line translation.
*/
if ( ch == '\n' )
outbyte( '\r' );
/*
* Wait for the transmitter to be ready.
* Check for flow control requests and process.
* Then output the character.
*/
while ((ajur->control & ALTERA_AVALON_JTAG_UART_CONTROL_WSPACE_MSK) == 0);
ajur->data = ch;
}
/*
* Open entry point
*/
rtems_device_driver console_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* Close entry point
*/
rtems_device_driver console_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* read bytes from the serial port. We only have stdin.
*/
rtems_device_driver console_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
rtems_libio_rw_args_t *rw_args;
char *buffer;
int maximum;
int count = 0;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
maximum = rw_args->count;
for (count = 0; count < maximum; count++) {
buffer[ count ] = inbyte();
if (buffer[ count ] == '\n' || buffer[ count ] == '\r') {
buffer[ count++ ] = '\n';
break;
}
}
rw_args->bytes_moved = count;
return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;
}
/*
* write bytes to the serial port. Stdout and stderr are the same.
*/
rtems_device_driver console_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
int count;
int maximum;
rtems_libio_rw_args_t *rw_args;
char *buffer;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
maximum = rw_args->count;
for (count = 0; count < maximum; count++) {
if ( buffer[ count ] == '\n') {
outbyte('\r');
}
outbyte( buffer[ count ] );
}
rw_args->bytes_moved = maximum;
return 0;
}
/*
* IO Control entry point
*/
rtems_device_driver console_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
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