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/* $OpenBSD: ast.c,v 1.20 2022/04/06 18:59:28 naddy Exp $ */
/* $NetBSD: ast.c,v 1.28 1996/05/12 23:51:45 mycroft Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
* Copyright (c) 1995 Charles Hannum. All rights reserved.
*
* This code is derived from public-domain software written by
* Roland McGrath.
*
* 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 by Charles Hannum.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/termios.h>
#include <machine/bus.h>
#include <machine/intr.h>
#include <dev/isa/isavar.h>
#include <dev/ic/comreg.h>
#include <dev/ic/comvar.h>
#define NSLAVES 4
struct ast_softc {
struct device sc_dev;
void *sc_ih;
bus_space_tag_t sc_iot;
int sc_iobase;
int sc_alive; /* mask of slave units attached */
void *sc_slaves[NSLAVES]; /* com device unit numbers */
bus_space_handle_t sc_slaveioh[NSLAVES];
};
int astprobe(struct device *, void *, void *);
void astattach(struct device *, struct device *, void *);
int astintr(void *);
int astprint(void *, const char *);
const struct cfattach ast_ca = {
sizeof(struct ast_softc), astprobe, astattach
};
struct cfdriver ast_cd = {
NULL, "ast", DV_TTY
};
int
astprobe(struct device *parent, void *self, void *aux)
{
struct isa_attach_args *ia = aux;
int iobase = ia->ia_iobase;
bus_space_tag_t iot = ia->ia_iot;
bus_space_handle_t ioh;
int i, rv = 1;
/*
* Do the normal com probe for the first UART and assume
* its presence, and the ability to map the other UARTS,
* means there is a multiport board there.
* XXX Needs more robustness.
*/
/* if the first port is in use as console, then it. */
if (iobase == comconsaddr && !comconsattached)
goto checkmappings;
if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
rv = 0;
goto out;
}
rv = comprobe1(iot, ioh);
bus_space_unmap(iot, ioh, COM_NPORTS);
if (rv == 0)
goto out;
checkmappings:
for (i = 1; i < NSLAVES; i++) {
iobase += COM_NPORTS;
if (iobase == comconsaddr && !comconsattached)
continue;
if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
rv = 0;
goto out;
}
bus_space_unmap(iot, ioh, COM_NPORTS);
}
out:
if (rv)
ia->ia_iosize = NSLAVES * COM_NPORTS;
return (rv);
}
int
astprint(void *aux, const char *pnp)
{
struct commulti_attach_args *ca = aux;
if (pnp)
printf("com at %s", pnp);
printf(" slave %d", ca->ca_slave);
return (UNCONF);
}
void
astattach(struct device *parent, struct device *self, void *aux)
{
struct ast_softc *sc = (void *)self;
struct isa_attach_args *ia = aux;
struct commulti_attach_args ca;
int i;
sc->sc_iot = ia->ia_iot;
sc->sc_iobase = ia->ia_iobase;
for (i = 0; i < NSLAVES; i++)
if (bus_space_map(sc->sc_iot, sc->sc_iobase + i * COM_NPORTS,
COM_NPORTS, 0, &sc->sc_slaveioh[i]))
panic("astattach: couldn't map slave %d", i);
/*
* Enable the master interrupt.
*/
bus_space_write_1(sc->sc_iot, sc->sc_slaveioh[3], 7, 0x80);
printf("\n");
for (i = 0; i < NSLAVES; i++) {
ca.ca_slave = i;
ca.ca_iot = sc->sc_iot;
ca.ca_ioh = sc->sc_slaveioh[i];
ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
ca.ca_noien = 1;
sc->sc_slaves[i] = config_found(self, &ca, astprint);
if (sc->sc_slaves[i] != NULL)
sc->sc_alive |= 1 << i;
}
sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
IPL_TTY, astintr, sc, sc->sc_dev.dv_xname);
}
int
astintr(void *arg)
{
struct ast_softc *sc = arg;
bus_space_tag_t iot = sc->sc_iot;
int alive = sc->sc_alive;
int bits;
bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
if (bits == 0)
return (0);
for (;;) {
#define TRY(n) \
if (bits & (1 << (n))) \
comintr(sc->sc_slaves[n]);
TRY(0);
TRY(1);
TRY(2);
TRY(3);
#undef TRY
bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive;
if (bits == 0)
return (1);
}
}
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