131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
/* $NetBSD: ns16550.c,v 1.1 2002/03/28 20:40:47 thorpej Exp $ */
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/*
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* Copyright (c) 2002 Wasabi Systems, Inc.
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* All rights reserved.
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*
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* Written by Jason R. Thorpe for Wasabi Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project by
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* Wasabi Systems, Inc.
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* 4. The name of Wasabi Systems, Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This file provides the cons_init() function and console I/O routines
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* for boards that use 16550-compatible UARTs.
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*/
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#include <sys/types.h>
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#include <dev/ic/comreg.h>
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#include <lib/libsa/stand.h>
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#include "board.h"
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#define INB(x) *((__volatile uint8_t *) (CONADDR + (x)))
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#define OUTB(x, v) *((__volatile uint8_t *) (CONADDR + (x))) = (v)
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#define ISSET(t,f) ((t) & (f))
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static int
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comspeed(int speed)
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{
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#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
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int x, err;
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if (speed <= 0)
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return (-1);
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x = divrnd((COM_FREQ / 16), speed);
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if (x <= 0)
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return (-1);
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err = divrnd((COM_FREQ / 16) * 1000, speed * x) - 1000;
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if (err < 0)
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err = -err;
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if (err > COM_TOLERANCE)
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return (-1);
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return (x);
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#undef divrnd
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}
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void
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cons_init(void)
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{
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int rate;
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OUTB(com_cfcr, LCR_DLAB);
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rate = comspeed(CONSPEED);
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OUTB(com_dlbl, rate);
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OUTB(com_dlbh, rate >> 8);
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OUTB(com_cfcr, LCR_8BITS);
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OUTB(com_mcr, MCR_DTR | MCR_RTS);
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OUTB(com_fifo,
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FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
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OUTB(com_ier, 0);
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}
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int
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getchar(void)
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{
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uint8_t stat;
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while (!ISSET(stat = INB(com_lsr), LSR_RXRDY))
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/* spin */ ;
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return (INB(com_data));
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}
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static void
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iputchar(int c)
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{
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uint8_t stat;
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int timo;
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/* Wait for any pending transmission to finish. */
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timo = 50000;
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while (!ISSET(stat = INB(com_lsr), LSR_TXRDY) && --timo)
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/* spin */ ;
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OUTB(com_data, c);
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/* Wait for this transmission to complete. */
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timo = 1500000;
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while (!ISSET(stat = INB(com_lsr), LSR_TXRDY) && --timo)
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/* spin */ ;
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/* Clear any interrupts generated by this transmission. */
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(void) INB(com_iir);
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}
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void
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putchar(int c)
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{
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if (c == '\n')
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iputchar('\r');
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iputchar(c);
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}
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