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/* $OpenBSD: bioscons.c,v 1.1 2004/02/03 12:09:47 mickey Exp $ */
/*
* Copyright (c) 1997-1999 Michael Shalayeff
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR OR HIS RELATIVES 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 MIND, 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.
*/
#include <sys/types.h>
#include <machine/biosvar.h>
#include <machine/pio.h>
#include <dev/isa/isareg.h>
#include <dev/ic/mc146818reg.h>
#include <dev/ic/comreg.h>
#include <dev/ic/ns16450reg.h>
/* #include <i386/isa/nvram.h> */
#include <dev/cons.h>
#include <lib/libsa/stand.h>
#include "biosdev.h"
/* XXX cannot trust NVRAM on this. Maybe later we make a real probe. */
#if 0
#define PRESENT_MASK (NVRAM_EQUIPMENT_KBD|NVRAM_EQUIPMENT_DISPLAY)
#else
#define PRESENT_MASK 0
#endif
void
pc_probe(struct consdev *cn)
{
cn->cn_pri = CN_INTERNAL;
cn->cn_dev = makedev(12, 0);
printf(" pc%d", minor(cn->cn_dev));
#if 0
outb(IO_RTC, NVRAM_EQUIPMENT);
if ((inb(IO_RTC+1) & PRESENT_MASK) == PRESENT_MASK) {
cn->cn_pri = CN_INTERNAL;
/* XXX from i386/conf.c */
cn->cn_dev = makedev(12, 0);
printf(" pc%d", minor(cn->cn_dev));
}
#endif
}
void
pc_init(struct consdev *cn)
{
}
int
pc_getc(dev_t dev)
{
register int rv;
if (dev & 0x80) {
__asm __volatile(DOINT(0x16) "; setnz %b0" : "=a" (rv) :
"0" (0x100) : "%ecx", "%edx", "cc" );
return (rv & 0xff);
}
__asm __volatile(DOINT(0x16) : "=a" (rv) : "0" (0x000) :
"%ecx", "%edx", "cc" );
return (rv & 0xff);
}
void
pc_putc(dev_t dev, int c)
{
__asm __volatile(DOINT(0x10) : : "a" (c | 0xe00), "b" (1) :
"%ecx", "%edx", "cc" );
}
const int comports[4] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
void
com_probe(struct consdev *cn)
{
register int i, n;
/* get equip. (9-11 # of coms) */
__asm __volatile(DOINT(0x11) : "=a" (n) : : "%ecx", "%edx", "cc");
n >>= 9;
n &= 7;
for (i = 0; i < n; i++)
printf(" com%d", i);
if (n) {
cn->cn_pri = CN_NORMAL;
/* XXX from i386/conf.c */
cn->cn_dev = makedev(8, 0);
}
}
void
com_init(struct consdev *cn)
{
register int unit = minor(cn->cn_dev);
/* let bios do necessary init first, 9600-N-1 */
__asm __volatile(DOINT(0x14) : : "a" (0xe3), "d" (unit) :
"%ecx", "cc" );
}
int
com_getc(dev_t dev)
{
register int rv;
if (dev & 0x80) {
__asm __volatile(DOINT(0x14) : "=a" (rv) :
"0" (0x300), "d" (minor(dev&0x7f)) : "%ecx", "cc" );
return ((rv & 0x100) == 0x100);
}
do
__asm __volatile(DOINT(0x14) : "=a" (rv) :
"0" (0x200), "d" (minor(dev)) : "%ecx", "cc" );
while (rv & 0x8000);
return (rv & 0xff);
}
/* call with sp == 0 to query the current speed */
int com_speed = 9600; /* default speed is 9600 baud */
int
comspeed(dev_t dev, int sp)
{
int i, newsp;
int err;
if (sp <= 0)
return com_speed;
/* valid baud rate? */
if (115200 < sp || sp < 75)
return -1;
/*
* Accepted speeds:
* 75 150 300 600 1200 2400 4800 9600 19200 38400 76800 and
* 14400 28800 57600 115200
*/
for (i = sp; i != 75 && i != 14400; i >>= 1)
if (i & 1)
return -1;
/* ripped screaming from dev/ic/com.c */
#define divrnd(n, q) (((n)*2/(q)+1)/2) /* divide and round off */
newsp = divrnd((COM_FREQ / 16), sp);
if (newsp <= 0)
return -1;
err = divrnd((COM_FREQ / 16) * 1000, sp * newsp) - 1000;
if (err < 0)
err = -err;
if (err > COM_TOLERANCE)
return -1;
#undef divrnd
if (cn_tab && cn_tab->cn_dev == dev && com_speed != sp) {
printf("com%d: changing speed to %d baud in 5 seconds, "
"change your terminal to match!\n\a",
minor(dev), sp);
sleep(5);
}
outb(comports[minor(dev)] + com_cfcr, LCR_DLAB);
outb(comports[minor(dev)] + com_dlbl, newsp);
outb(comports[minor(dev)] + com_dlbh, newsp>>8);
outb(comports[minor(dev)] + com_cfcr, LCR_8BITS);
printf("\ncom%d: %d baud\n", minor(dev), sp);
newsp = com_speed;
com_speed = sp;
return newsp;
}
void
com_putc(dev_t dev, int c)
{
register int rv;
dev = minor(dev) & 0x7f;
/* check online (DSR) */
__asm __volatile(DOINT(0x14) : "=a" (rv) :
"0" (0x300), "d" (dev) : "%ecx", "cc" );
if ( !(rv & 0x20) )
return;
/* send character */
__asm __volatile(DOINT(0x14) : "=a" (rv) :
"0" (c | 0x100), "d" (dev) : "%ecx", "cc" );
}
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