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/*
* 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>
#include <amba.h>
/* Let user override which on-chip APBUART will be debug UART
* 0 = Default APBUART. On MP system CPU0=APBUART0, CPU1=APBUART1...
* 1 = APBUART[0]
* 2 = APBUART[1]
* 3 = APBUART[2]
* ...
*/
int syscon_uart_index __attribute__((weak)) = 0;
/*
* Should we use a polled or interrupt drived console?
*
* NOTE: This is defined in the custom/leon.cfg file.
*/
/*
* apbuart_outbyte_polled
*
* This routine transmits a character using polling.
*/
extern void apbuart_outbyte_polled(
ambapp_apb_uart *regs,
char ch
);
/* body is in debugputs.c */
/*
* apbuart_inbyte_nonblocking
*
* This routine polls for a character.
*/
extern int apbuart_inbyte_nonblocking(ambapp_apb_uart *regs);
/* body is in debugputs.c */
/*
* Console Termios Support Entry Points
*
*/
ssize_t console_write_support (int minor, const char *buf, size_t len)
{
int nwrite = 0, port;
if (minor == 0)
port = syscon_uart_index;
else
port = minor - 1;
while (nwrite < len) {
apbuart_outbyte_polled((ambapp_apb_uart*)LEON3_Console_Uart[port], *buf++);
nwrite++;
}
return nwrite;
}
int console_pollRead(int minor)
{
int port;
if (minor == 0)
port = syscon_uart_index;
else
port = minor - 1;
return apbuart_inbyte_nonblocking((ambapp_apb_uart*)LEON3_Console_Uart[port]);
}
/*
* Console Device Driver Entry Points
*
*/
int uarts = 0;
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;
int i;
char console_name[16];
rtems_termios_initialize();
/* Update syscon_uart_index to index used as /dev/console
* Let user select System console by setting syscon_uart_index. If the
* BSP is to provide the default UART (syscon_uart_index==0):
* non-MP: APBUART[0] is system console
* MP: LEON CPU index select UART
*/
if (syscon_uart_index == 0) {
#if defined(RTEMS_MULTIPROCESSING)
syscon_uart_index = LEON3_Cpu_Index;
#else
syscon_uart_index = 0;
#endif
} else {
syscon_uart_index = syscon_uart_index - 1; /* User selected sys-console */
}
/* Register Device Names
*
* 0 /dev/console - APBUART[USER-SELECTED, DEFAULT=APBUART[0]]
* 1 /dev/console_a - APBUART[0] (by default not present because is console)
* 2 /dev/console_b - APBUART[1]
* ...
*
* On a MP system one should not open UARTs that other OS instances use.
*/
if (syscon_uart_index < uarts) {
status = rtems_io_register_name( "/dev/console", major, 0 );
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
}
strcpy(console_name,"/dev/console_a");
for (i = 0; i < uarts; i++) {
if (i == syscon_uart_index)
continue; /* skip UART that is registered as /dev/console */
console_name[13] = 'a' + i;
status = rtems_io_register_name( console_name, major, i+1);
}
return RTEMS_SUCCESSFUL;
}
rtems_device_driver console_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
rtems_status_code sc;
int port;
static const rtems_termios_callbacks pollCallbacks = {
NULL, /* firstOpen */
NULL, /* lastClose */
console_pollRead, /* pollRead */
console_write_support, /* write */
NULL, /* setAttributes */
NULL, /* stopRemoteTx */
NULL, /* startRemoteTx */
0 /* outputUsesInterrupts */
};
assert(minor <= uarts);
if (minor > uarts || minor == (syscon_uart_index + 1))
return RTEMS_INVALID_NUMBER;
sc = rtems_termios_open (major, minor, arg, &pollCallbacks);
if (sc != RTEMS_SUCCESSFUL)
return sc;
if (minor == 0)
port = syscon_uart_index;
else
port = minor - 1;
/* Initialize UART on opening */
LEON3_Console_Uart[port]->ctrl |= LEON_REG_UART_CTRL_RE |
LEON_REG_UART_CTRL_TE;
LEON3_Console_Uart[port]->status = 0;
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);
}
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