/* * Copyright (C) 2001 MontaVista Software Inc. * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net * * 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. * */#include "uart16550.h"/* === CONFIG === */#define         BASE                    0xb0000080#define         MAX_BAUD                1152000#define		REG_OFFSET		4/* === END OF CONFIG === *//* register offset */#define         OFS_RCV_BUFFER          (0*REG_OFFSET)#define         OFS_TRANS_HOLD          (0*REG_OFFSET)#define         OFS_SEND_BUFFER         (0*REG_OFFSET)#define         OFS_INTR_ENABLE         (1*REG_OFFSET)#define         OFS_INTR_ID             (2*REG_OFFSET)#define         OFS_DATA_FORMAT         (3*REG_OFFSET)#define         OFS_LINE_CONTROL        (3*REG_OFFSET)#define         OFS_MODEM_CONTROL       (4*REG_OFFSET)#define         OFS_RS232_OUTPUT        (4*REG_OFFSET)#define         OFS_LINE_STATUS         (5*REG_OFFSET)#define         OFS_MODEM_STATUS        (6*REG_OFFSET)#define         OFS_RS232_INPUT         (6*REG_OFFSET)#define         OFS_SCRATCH_PAD         (7*REG_OFFSET)#define         OFS_DIVISOR_LSB         (0*REG_OFFSET)#define         OFS_DIVISOR_MSB         (1*REG_OFFSET)/* memory-mapped read/write of the port */#define         UART16550_READ(y)    (*((volatile uint8*)(BASE + y)))#define         UART16550_WRITE(y, z)  ((*((volatile uint8*)(BASE + y))) = z)#define DEBUG_LED (*(unsigned short*)0xb7ffffc0)#define OutputLED(x)  (DEBUG_LED = x)void Uart16550Init(uint32 baud, uint8 data, uint8 parity, uint8 stop){    /* disable interrupts */    UART16550_WRITE(OFS_INTR_ENABLE, 0);    /* set up buad rate */    {         uint32 divisor;               /* set DIAB bit */        UART16550_WRITE(OFS_LINE_CONTROL, 0x80);                /* set divisor */        divisor = MAX_BAUD / baud;        UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);        UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00)>>8);        /* clear DIAB bit */        UART16550_WRITE(OFS_LINE_CONTROL, 0x0);    }    /* set data format */    UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);}uint8 Uart16550GetPoll(){    while((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);    return UART16550_READ(OFS_RCV_BUFFER);}void Uart16550Put(uint8 byte){    while ((UART16550_READ(OFS_LINE_STATUS) &0x20) == 0);    UART16550_WRITE(OFS_SEND_BUFFER, byte);}