140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/* $NetBSD: ns16550.c,v 1.4 2008/10/30 06:23:13 cliff Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2002 Wasabi Systems, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed for the NetBSD Project by
|
|
* Wasabi Systems, Inc.
|
|
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
|
|
* or promote products derived from this software without specific prior
|
|
* written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* This file provides the cons_init() function and console I/O routines
|
|
* for boards that use 16550-compatible UARTs.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <dev/ic/comreg.h>
|
|
#include <lib/libsa/stand.h>
|
|
|
|
#include "board.h"
|
|
|
|
#ifdef NS16550_AX4
|
|
#define INB(x) *((volatile uint8_t *) (CONADDR + ((x) * 4)))
|
|
#define OUTB(x, v) *((volatile uint8_t *) (CONADDR + ((x) * 4))) = (v)
|
|
#else
|
|
#define INB(x) *((volatile uint8_t *) (CONADDR + (x)))
|
|
#define OUTB(x, v) *((volatile uint8_t *) (CONADDR + (x))) = (v)
|
|
#endif
|
|
|
|
#define ISSET(t,f) ((t) & (f))
|
|
|
|
#ifndef NS16550_FREQ
|
|
#define NS16550_FREQ COM_FREQ
|
|
#endif
|
|
|
|
static int
|
|
comspeed(int speed)
|
|
{
|
|
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
|
|
|
|
int x, err;
|
|
|
|
if (speed <= 0)
|
|
return (-1);
|
|
x = divrnd((NS16550_FREQ / 16), speed);
|
|
if (x <= 0)
|
|
return (-1);
|
|
err = divrnd((((quad_t)NS16550_FREQ) / 16) * 1000, speed * x) - 1000;
|
|
if (err < 0)
|
|
err = -err;
|
|
if (err > COM_TOLERANCE)
|
|
return (-1);
|
|
return (x);
|
|
#undef divrnd
|
|
}
|
|
|
|
void
|
|
cons_init(void)
|
|
{
|
|
int rate;
|
|
|
|
OUTB(com_cfcr, LCR_DLAB);
|
|
rate = comspeed(CONSPEED);
|
|
OUTB(com_dlbl, rate);
|
|
OUTB(com_dlbh, rate >> 8);
|
|
OUTB(com_cfcr, LCR_8BITS);
|
|
OUTB(com_mcr, MCR_DTR | MCR_RTS);
|
|
OUTB(com_fifo,
|
|
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1);
|
|
OUTB(com_ier, 0);
|
|
}
|
|
|
|
int
|
|
getchar(void)
|
|
{
|
|
uint8_t stat;
|
|
|
|
while (!ISSET(stat = INB(com_lsr), LSR_RXRDY))
|
|
/* spin */ ;
|
|
return (INB(com_data));
|
|
}
|
|
|
|
static void
|
|
iputchar(int c)
|
|
{
|
|
uint8_t stat;
|
|
int timo;
|
|
|
|
/* Wait for any pending transmission to finish. */
|
|
timo = 50000;
|
|
while (!ISSET(stat = INB(com_lsr), LSR_TXRDY) && --timo)
|
|
/* spin */ ;
|
|
|
|
OUTB(com_data, c);
|
|
|
|
/* Wait for this transmission to complete. */
|
|
timo = 1500000;
|
|
while (!ISSET(stat = INB(com_lsr), LSR_TXRDY) && --timo)
|
|
/* spin */ ;
|
|
|
|
/* Clear any interrupts generated by this transmission. */
|
|
(void) INB(com_iir);
|
|
}
|
|
|
|
void
|
|
putchar(int c)
|
|
{
|
|
|
|
if (c == '\n')
|
|
iputchar('\r');
|
|
iputchar(c);
|
|
}
|