87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/*
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* Copyright (C) 2001 MontaVista Software Inc.
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* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include "uart16550.h"
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/* === CONFIG === */
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#define BASE 0xb8058000
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#define MAX_BAUD 1152000
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#define REG_OFFSET 4
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/* === END OF CONFIG === */
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/* register offset */
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#define OFS_RCV_BUFFER (0*REG_OFFSET)
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#define OFS_TRANS_HOLD (0*REG_OFFSET)
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#define OFS_SEND_BUFFER (0*REG_OFFSET)
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#define OFS_INTR_ENABLE (1*REG_OFFSET)
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#define OFS_INTR_ID (2*REG_OFFSET)
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#define OFS_DATA_FORMAT (3*REG_OFFSET)
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#define OFS_LINE_CONTROL (3*REG_OFFSET)
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#define OFS_MODEM_CONTROL (4*REG_OFFSET)
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#define OFS_RS232_OUTPUT (4*REG_OFFSET)
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#define OFS_LINE_STATUS (5*REG_OFFSET)
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#define OFS_MODEM_STATUS (6*REG_OFFSET)
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#define OFS_RS232_INPUT (6*REG_OFFSET)
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#define OFS_SCRATCH_PAD (7*REG_OFFSET)
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#define OFS_DIVISOR_LSB (0*REG_OFFSET)
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#define OFS_DIVISOR_MSB (1*REG_OFFSET)
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/* memory-mapped read/write of the port */
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#define UART16550_READ(y) (*((volatile uint32*)(BASE + y)))
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#define UART16550_WRITE(y, z) ((*((volatile uint32*)(BASE + y))) = z)
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#define DEBUG_LED (*(unsigned short*)0xb7ffffc0)
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#define OutputLED(x) (DEBUG_LED = x)
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void Uart16550Init(uint32 baud, uint8 data, uint8 parity, uint8 stop)
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{
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/* disable interrupts */
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UART16550_WRITE(OFS_INTR_ENABLE, 0);
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/* set up buad rate */
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{
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uint32 divisor;
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/* set DIAB bit */
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UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
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/* set divisor */
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divisor = MAX_BAUD / baud;
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UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
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UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00)>>8);
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/* clear DIAB bit */
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UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
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}
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/* set data format */
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UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
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}
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uint8 Uart16550GetPoll()
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{
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while((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);
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return UART16550_READ(OFS_RCV_BUFFER);
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}
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void Uart16550Put(uint8 byte)
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{
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while ((UART16550_READ(OFS_LINE_STATUS) &0x20) == 0);
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UART16550_WRITE(OFS_SEND_BUFFER, byte);
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}
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