/*
* This file contains the TTY driver for the serial ports on the LEON.
*
* This driver uses the termios pseudo driver.
*
* COPYRIGHT (c) 1989-1998.
* On-Line Applications Research Corporation (OAR).
*
* Modified for LEON3 BSP.
* COPYRIGHT (c) 2004.
* Gaisler Research.
*
* 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.
*
* $Id$
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <assert.h>
#include <rtems/bspIo.h>
/*
* Should we use a polled or interrupt drived console?
*
* NOTE: This is defined in the custom/leon.cfg file.
*
* WARNING: In sis 1.6, it did not appear that the UART interrupts
* worked in a desirable fashion. Immediately upon writing
* a character into the TX buffer, an interrupt was generated.
* This did not allow enough time for the program to put more
* characters in the buffer. So every character resulted in
* "priming" the transmitter. This effectively results in
* in a polled console with a useless interrupt per character
* on output. It is reasonable to assume that input does not
* share this problem although it was not investigated.
*
*/
/*
* console_outbyte_polled
*
* This routine transmits a character using polling.
*/
void console_outbyte_polled(
int port,
char ch
);
/* body is in debugputs.c */
/*
* console_inbyte_nonblocking
*
* This routine polls for a character.
*/
int console_inbyte_nonblocking( int port );
/* body is in debugputs.c */
/*
* 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
*
*/
volatile LEON3_UART_Regs_Map *LEON3_Console_Uart[LEON3_APBUARTS];
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
unsigned int iobar, conf;
int i, uarts;
char *console_name = "/dev/console_a";
rtems_termios_initialize();
/* Find UARTs */
i = 0; uarts = 0;
while (i < amba_conf.apbslv.devnr)
{
conf = amba_get_confword(amba_conf.apbslv, i, 0);
if ((amba_vendor(conf) == VENDOR_GAISLER) && (amba_device(conf) == GAISLER_APBUART))
{
iobar = amba_apb_get_membar(amba_conf.apbslv, i);
LEON3_Console_Uart[uarts] = (volatile LEON3_UART_Regs_Map *) amba_iobar_start(amba_conf.apbmst, iobar);
uarts++;
}
i++;
}
/* Register Device Names */
if (uarts)
{
status = rtems_io_register_name( "/dev/console", major, 0 );
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
for (i = 1; i < uarts; i++)
{
console_name[13]++;
status = rtems_io_register_name( console_name, major, i);
}
}
/*
* Initialize Hardware
*/
for (i = 0; i < uarts; i++)
{
LEON3_Console_Uart[i]->ctrl |= LEON_REG_UART_CTRL_RE | LEON_REG_UART_CTRL_TE;
LEON3_Console_Uart[i]->status = 0;
}
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 <= LEON3_APBUARTS );
if ( minor > LEON3_APBUARTS )
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);
}
/* putchar/getchar for printk */
static void bsp_out_char(char c)
{
console_outbyte_polled(0, c);
}
BSP_output_char_function_type BSP_output_char = bsp_out_char;
static char bsp_in_char(void)
{
int tmp;
while ((tmp = console_inbyte_nonblocking(0)) < 0);
return (char) tmp;
}
BSP_polling_getchar_function_type BSP_poll_char = bsp_in_char;
