ser2.c

arm7,44b0芯片的blob程序,适用于学嵌入式linux的新手.

/*
 * serial-s3c44b0.c: StrongARM SA11x0 serial port driver
 *
 * Copyright (C) 2002  Erik Mouw <[e-mail]>
 *
 * $Id: serial-s3c44b0.c,v 1.2 2002/01/03 16:07:18 erikm Exp $
 *
 * 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
 *
 */

#ident "$Id: serial-s3c44b0.c,v 1.2 2002/01/03 16:07:18 erikm Exp $"

#ifdef HAVE_CONFIG_H
# include <blob/config.h>
#endif

#include <blob/arch.h>
#include <blob/errno.h>
#include <blob/serial.h>
#include <blob/types.h>



static int swrite(int c)
{
	/* wait for room in the transmit FIFO */
	while(!(REG(UTRSTAT1)&0x02));

	REGB(UTXH1) = (unsigned char)c;

	return 0;
}

static void ERROR(char *s)
{
	int len, i;

        len = strlen(s);
        for(i=0; i<len; i++){
            swrite(s[i]);
            if(s[i] == '\n')
                swrite('\r');
        }
}