/*
 * BRIEF MODULE DESCRIPTION
 *	Simple Au1000 uart routines.
 *
 * Copyright 2001 MontaVista Software Inc.
 * Author: MontaVista Software, Inc.
 *		ppopov@mvista.com or source@mvista.com
 *
 *  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  SOFTWARE  IS PROVIDED	  ``AS	IS'' AND   ANY	EXPRESS OR IMPLIED
 *  WARRANTIES,	  INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
 *  NO	EVENT  SHALL   THE AUTHOR  BE	 LIABLE FOR ANY	  DIRECT, INDIRECT,
 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *  NOT LIMITED	  TO, PROCUREMENT OF  SUBSTITUTE GOODS	OR SERVICES; LOSS OF
 *  USE, DATA,	OR PROFITS; OR	BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN	 CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 */
#include <linux/config.h>
#include <asm/io.h>
#include <asm/au1000.h>
#include "ns16550.h"

typedef         unsigned char uint8;
typedef         unsigned int  uint32;

#define         UART16550_BAUD_2400             2400
#define         UART16550_BAUD_4800             4800
#define         UART16550_BAUD_9600             9600
#define         UART16550_BAUD_19200            19200
#define         UART16550_BAUD_38400            38400
#define         UART16550_BAUD_57600            57600
#define         UART16550_BAUD_115200           115200

#define         UART16550_PARITY_NONE           0
#define         UART16550_PARITY_ODD            0x08
#define         UART16550_PARITY_EVEN           0x18
#define         UART16550_PARITY_MARK           0x28
#define         UART16550_PARITY_SPACE          0x38

#define         UART16550_DATA_5BIT             0x0
#define         UART16550_DATA_6BIT             0x1
#define         UART16550_DATA_7BIT             0x2
#define         UART16550_DATA_8BIT             0x3

#define         UART16550_STOP_1BIT             0x0
#define         UART16550_STOP_2BIT             0x4


/* memory-mapped read/write of the port */
#define UART16550_READ(y)    (readl(UART_BASE + y) & 0xff)
#define UART16550_WRITE(y,z) (writel(z&0xff, UART_BASE + y))

/*
 * We use uart 0, which is already initialized by
 * yamon. 
 */
volatile struct NS16550 *
serial_init(int chan)
{
	volatile struct NS16550 *com_port;
	com_port = (struct NS16550 *) UART_BASE;
	return (com_port);
}

void
serial_putc(volatile struct NS16550 *com_port, unsigned char c)
{
	while ((UART16550_READ(UART_LSR)&0x40) == 0);
	UART16550_WRITE(UART_TX, c);
	return 1;
}

unsigned char
serial_getc(volatile struct NS16550 *com_port)
{
	while((UART16550_READ(UART_LSR) & 0x1) == 0);
	return UART16550_READ(UART_RX);
}

int
serial_tstc(volatile struct NS16550 *com_port)
{
	return((UART16550_READ(UART_LSR) & LSR_DR) != 0);
}