xref: /src/sys/arch/hp300/stand/common/apci.c

/*	$NetBSD: apci.c,v 1.14 2023/04/21 22:44:27 tsutsui Exp $	*/

/*-
 * Copyright (c) 1997, 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *	@(#)dca.c	8.1 (Berkeley) 6/10/93
 */

#ifdef APCICONSOLE
#include <sys/param.h>
#include <dev/cons.h>

#include <lib/libsa/stand.h>

#include <hp300/dev/frodoreg.h>		/* for APCI offsets */
#include <hp300/dev/intioreg.h>		/* for frodo offsets */

#include <hp300/stand/common/apcireg.h>	/* for register map */
#include <hp300/stand/common/dcareg.h>	/* for register bits */
#include <hp300/stand/common/consdefs.h>
#include <hp300/stand/common/samachdep.h>

struct apciregs *apcicnaddr = 0;

void
apciprobe(struct consdev *cp)
{
	volatile uint8_t *frodoregs;

	cp->cn_pri = CN_DEAD;

	/*
	 * Only a 425e can have an APCI console.  On all other 4xx models,
	 * the "first" serial port is mapped to the DCA at select code 9.
	 */
	if (machineid != HP_425 || mmuid != MMUID_425_E)
		return;

	/*
	 * Check the service switch. On the 425e, this is a physical
	 * switch, unlike other frodo-based machines, so we can use it
	 * as a serial vs internal video selector, since the PROM can not
	 * be configured for serial console.
	 */
	frodoregs = (volatile u_int8_t *)IIOV(INTIOBASE + FRODO_BASE);
	if (badaddr((char *)frodoregs) == 0 &&
	    (frodoregs[FRODO_IISR] & FRODO_IISR_SERVICE) == 0)
		cp->cn_pri = CN_REMOTE;
	else
		cp->cn_pri = CN_NORMAL;

#ifdef FORCEAPCICONSOLE
	cp->cn_pri = CN_REMOTE;
#endif
	curcons_scode = -2;

	apcicnaddr =
	    (void *)IIOV(INTIOBASE + FRODO_BASE + FRODO_APCI_OFFSET(1));
}

void
apciinit(struct consdev *cp)
{
	struct apciregs *apci = (struct apciregs *)apcicnaddr;

	/*
	 * The only system on which this will happen is a 425e,
	 * which does not currently have a framebuffer console
	 * driver.  We use the ROM's output method to let the
	 * operator know we're switching to the APCI.
	 */
	userom = 1;
	printf("Switching to APCI console.\n");
	userom = 0;

	apci->ap_cfcr = CFCR_DLAB;
	apci->ap_data = APCIBRD(9600) & 0xff;
	apci->ap_ier  = (APCIBRD(9600) >> 8) & 0xff;
	apci->ap_cfcr = CFCR_8BITS;
	apci->ap_fifo =
	    FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_1;
	apci->ap_mcr = MCR_DTR | MCR_RTS;
}

#ifndef SMALL
int
apcigetchar(dev_t dev)
{
	struct apciregs *apci = apcicnaddr;
	short stat;
	int c;

	if (((stat = apci->ap_lsr) & LSR_RXRDY) == 0)
		return 0;
	c = apci->ap_data;
	return c;
}
#else
int
apcigetchar(dev_t dev)
{

	return 0;
}
#endif

void
apciputchar(dev_t dev, int c)
{
	struct apciregs *apci = apcicnaddr;
	int timo;
	short stat;

	/* wait a reasonable time for the transmitter to come ready */
	timo = 50000;
	while (((stat = apci->ap_lsr) & LSR_TXRDY) == 0 && --timo)
		;
	apci->ap_data = c;
	/* wait for this transmission to complete */
	timo = 1000000;
	while (((stat = apci->ap_lsr) & LSR_TXRDY) == 0 && --timo)
		;
}
#endif