a7d2293ea4
register for a port under high load. The effect is that the port is wedged waiting for an interrupt that will never come. Add a callout-based watchdog which periodically (hz/10) scan trough the ports for missed interrupts. Problem also noted by Chris Jones, and this fix also helped him.
247 lines
6.1 KiB
C
247 lines
6.1 KiB
C
/* $NetBSD: boca.c,v 1.34 2000/07/27 20:08:47 bouyer Exp $ */
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/*
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* Copyright (c) 1996 Christopher G. Demetriou. All rights reserved.
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* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
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*
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* This code is derived from public-domain software written by
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* Roland McGrath, and information provided by David Muir Sharnoff.
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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 by Charles M. Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/termios.h>
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#include <sys/kernel.h>
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#include <sys/callout.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <dev/ic/comreg.h>
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#include <dev/ic/comvar.h>
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#include <dev/isa/isavar.h>
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#include <dev/isa/com_multi.h>
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#define NSLAVES 8
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struct boca_softc {
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struct device sc_dev;
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void *sc_ih;
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bus_space_tag_t sc_iot;
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int sc_iobase;
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int sc_alive; /* mask of slave units attached */
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void *sc_slaves[NSLAVES]; /* com device unit numbers */
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bus_space_handle_t sc_slaveioh[NSLAVES];
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struct callout fixup;
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};
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int bocaprobe __P((struct device *, struct cfdata *, void *));
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void bocaattach __P((struct device *, struct device *, void *));
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int bocaintr __P((void *));
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void boca_fixup __P((void *));
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int bocaprint __P((void *, const char *));
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struct cfattach boca_ca = {
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sizeof(struct boca_softc), bocaprobe, bocaattach,
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};
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int
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bocaprobe(parent, self, aux)
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struct device *parent;
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struct cfdata *self;
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void *aux;
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{
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struct isa_attach_args *ia = aux;
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int iobase = ia->ia_iobase;
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bus_space_tag_t iot = ia->ia_iot;
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bus_space_handle_t ioh;
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int i, rv = 1;
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/*
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* Do the normal com probe for the first UART and assume
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* its presence, and the ability to map the other UARTS,
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* means there is a multiport board there.
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* XXX Needs more robustness.
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*/
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/* Disallow wildcarded i/o address. */
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if (ia->ia_iobase == ISACF_PORT_DEFAULT)
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return (0);
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/* if the first port is in use as console, then it. */
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if (com_is_console(iot, iobase, 0))
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goto checkmappings;
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if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
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rv = 0;
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goto out;
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}
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rv = comprobe1(iot, ioh);
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bus_space_unmap(iot, ioh, COM_NPORTS);
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if (rv == 0)
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goto out;
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checkmappings:
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for (i = 1; i < NSLAVES; i++) {
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iobase += COM_NPORTS;
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if (com_is_console(iot, iobase, 0))
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continue;
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if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) {
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rv = 0;
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goto out;
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}
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bus_space_unmap(iot, ioh, COM_NPORTS);
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}
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out:
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if (rv)
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ia->ia_iosize = NSLAVES * COM_NPORTS;
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return (rv);
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}
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int
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bocaprint(aux, pnp)
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void *aux;
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const char *pnp;
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{
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struct commulti_attach_args *ca = aux;
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if (pnp)
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printf("com at %s", pnp);
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printf(" slave %d", ca->ca_slave);
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return (UNCONF);
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}
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void
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bocaattach(parent, self, aux)
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struct device *parent, *self;
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void *aux;
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{
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struct boca_softc *sc = (void *)self;
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struct isa_attach_args *ia = aux;
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struct commulti_attach_args ca;
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bus_space_tag_t iot = ia->ia_iot;
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int i, iobase;
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printf("\n");
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sc->sc_iot = ia->ia_iot;
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sc->sc_iobase = ia->ia_iobase;
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for (i = 0; i < NSLAVES; i++) {
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iobase = sc->sc_iobase + i * COM_NPORTS;
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if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) &&
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bus_space_map(iot, iobase, COM_NPORTS, 0,
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&sc->sc_slaveioh[i])) {
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printf("%s: can't map i/o space for slave %d\n",
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sc->sc_dev.dv_xname, i);
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return;
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}
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}
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for (i = 0; i < NSLAVES; i++) {
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ca.ca_slave = i;
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ca.ca_iot = sc->sc_iot;
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ca.ca_ioh = sc->sc_slaveioh[i];
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ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS;
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ca.ca_noien = 0;
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sc->sc_slaves[i] = config_found(self, &ca, bocaprint);
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if (sc->sc_slaves[i] != NULL)
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sc->sc_alive |= 1 << i;
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}
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sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE,
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IPL_SERIAL, bocaintr, sc);
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callout_init(&sc->fixup);
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callout_reset(&sc->fixup, hz/10, boca_fixup, sc);
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}
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int
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bocaintr(arg)
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void *arg;
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{
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struct boca_softc *sc = arg;
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bus_space_tag_t iot = sc->sc_iot;
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int alive = sc->sc_alive;
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int bits;
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bits = bus_space_read_1(iot, sc->sc_slaveioh[0], com_scratch) & alive;
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if (bits == 0)
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return (0);
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for (;;) {
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#define TRY(n) \
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if (bits & (1 << (n))) { \
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if (comintr(sc->sc_slaves[n]) == 0) { \
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printf("%s: bogus intr for port %d\n", \
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sc->sc_dev.dv_xname, n); \
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} \
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}
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TRY(0);
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TRY(1);
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TRY(2);
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TRY(3);
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TRY(4);
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TRY(5);
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TRY(6);
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TRY(7);
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#undef TRY
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bits = bus_space_read_1(iot, sc->sc_slaveioh[0],
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com_scratch) & alive;
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if (bits == 0) {
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return (1);
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}
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}
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}
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void
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boca_fixup(v)
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void *v;
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{
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struct boca_softc *sc = v;
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int alive = sc->sc_alive;
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int i, s;
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s = splserial();
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for (i = 0; i < 8; i++) {
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if (alive & (1 << (i)))
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comintr(sc->sc_slaves[i]);
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}
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callout_reset(&sc->fixup, hz/10, boca_fixup, sc);
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splx(s);
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}
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