86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*
|
|
* 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 0xb8058000
|
|
#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 uint32*)(BASE + y)))
|
|
#define UART16550_WRITE(y, z) ((*((volatile uint32*)(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);
|
|
}
|
|
|