serial.c

Linux2.4.27在AT91RM9200下的U-BOOT代码。可以在Redhat9等版本下使用。适合ARM学习者使用。

/*
 * (C) Copyright 2001
 * Josh Huber <[e-mail]>, Mission Critical Linux, Inc.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * serial.c - serial support for the gal ev board
 */

/* supports both the 16650 duart and the MPSC */

#include <common.h>
#include <command.h>
#include <galileo/memory.h>

#if (defined CFG_INIT_CHAN1) || (defined CFG_INIT_CHAN2)
#include <ns16550.h>
#endif

#include "serial.h"

#include "mpsc.h"

#if (defined CFG_INIT_CHAN1) || (defined CFG_INIT_CHAN2)
const NS16550_t COM_PORTS[] = { (NS16550_t) CFG_NS16550_COM1,
				(NS16550_t) CFG_NS16550_COM2 };
#endif

#ifdef CONFIG_MPSC

int serial_init (void)
{
	DECLARE_GLOBAL_DATA_PTR;

#if (defined CFG_INIT_CHAN1) || (defined CFG_INIT_CHAN2)
	int clock_divisor = CFG_NS16550_CLK / 16 / gd->baudrate;
#endif

	mpsc_init(gd->baudrate);

	/* init the DUART chans so that KGDB in the kernel can use them */
#ifdef CFG_INIT_CHAN1
	NS16550_reinit(COM_PORTS[0], clock_divisor);
#endif
#ifdef CFG_INIT_CHAN2
	NS16550_reinit(COM_PORTS[1], clock_divisor);
#endif
	return (0);
}

void
serial_putc(const char c)
{
	if (c == '\n')
		mpsc_putchar('\r');

	mpsc_putchar(c);
}

int
serial_getc(void)
{
	return mpsc_getchar();
}

int
serial_tstc(void)
{
	return mpsc_test_char();
}

void
serial_setbrg (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	galbrg_set_baudrate(CONFIG_MPSC_PORT, gd->baudrate);
}

#else /* ! CONFIG_MPSC */

int serial_init (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	int clock_divisor = CFG_NS16550_CLK / 16 / gd->baudrate;

#ifdef CFG_INIT_CHAN1
	(void)NS16550_init(COM_PORTS[0], clock_divisor);
#endif
#ifdef CFG_INIT_CHAN2
	(void)NS16550_init(COM_PORTS[1], clock_divisor);
#endif

	return (0);
}

void
serial_putc(const char c)
{
	if (c == '\n')
		NS16550_putc(COM_PORTS[CFG_DUART_CHAN], '\r');

	NS16550_putc(COM_PORTS[CFG_DUART_CHAN], c);
}

int
serial_getc(void)
{
	return NS16550_getc(COM_PORTS[CFG_DUART_CHAN]);
}

int
serial_tstc(void)
{
	return NS16550_tstc(COM_PORTS[CFG_DUART_CHAN]);
}

void
serial_setbrg (void)
{
	DECLARE_GLOBAL_DATA_PTR;

	int clock_divisor = CFG_NS16550_CLK / 16 / gd->baudrate;

#ifdef CFG_INIT_CHAN1
	NS16550_reinit(COM_PORTS[0], clock_divisor);
#endif
#ifdef CFG_INIT_CHAN2
	NS16550_reinit(COM_PORTS[1], clock_divisor);
#endif
}

#endif /* CONFIG_MPSC */

void
serial_puts (const char *s)
{
	while (*s) {
		serial_putc (*s++);
	}
}

#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
void
kgdb_serial_init(void)
{
}

void
putDebugChar (int c)
{
	serial_putc (c);
}

void
putDebugStr (const char *str)
{
	serial_puts (str);
}

int
getDebugChar (void)
{
	return serial_getc();
}

void
kgdb_interruptible (int yes)
{
	return;
}
#endif	/* CFG_CMD_KGDB	*/