464 lines
12 KiB
C
464 lines
12 KiB
C
/* $NetBSD: hpib.c,v 1.33 2006/03/28 17:38:25 thorpej Exp $ */
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/*-
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* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)hpib.c 8.2 (Berkeley) 1/12/94
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*/
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/*
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* HP-IB bus driver
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: hpib.c,v 1.33 2006/03/28 17:38:25 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/malloc.h>
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#include <sys/device.h>
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#include <hp300/dev/dmavar.h>
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#include <hp300/dev/hpibvar.h>
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#include <machine/cpu.h>
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#include <machine/hp300spu.h>
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#include "ioconf.h"
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static int hpibbusmatch(struct device *, struct cfdata *, void *);
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static void hpibbusattach(struct device *, struct device *, void *);
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CFATTACH_DECL(hpibbus, sizeof(struct hpibbus_softc),
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hpibbusmatch, hpibbusattach, NULL, NULL);
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static void hpibbus_attach_children(struct hpibbus_softc *);
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static int hpibbussearch(struct device *, struct cfdata *,
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const int *, void *);
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static int hpibbusprint(void *, const char *);
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static int hpibbus_alloc(struct hpibbus_softc *, int, int);
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#if 0
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static void hpibbus_free(struct hpibbus_softc *, int, int);
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#endif
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static void hpibstart(void *);
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static void hpibdone(void *);
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int hpibtimeout = 100000; /* # of status tests before we give up */
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int hpibidtimeout = 10000; /* # of status tests for hpibid() calls */
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int hpibdmathresh = 3; /* byte count beyond which to attempt dma */
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/*
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* HP-IB is essentially an IEEE 488 bus, with an HP command
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* set (CS/80 on `newer' devices, Amigo on before-you-were-born
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* devices) thrown on top. Devices that respond to CS/80 (and
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* probably Amigo, too) are tagged with a 16-bit ID.
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*
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* HP-IB has a 2-level addressing scheme; slave, the analog
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* of a SCSI ID, and punit, the analog of a SCSI LUN. Unforunately,
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* IDs are on a per-slave basis; punits are often used for disk
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* drives that have an accompanying tape drive on the second punit.
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*
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* In addition, not all HP-IB devices speak CS/80 or Amigo.
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* Examples of such devices are HP-IB plotters, which simply
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* take raw plotter commands over 488. These devices do not
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* have ID tags, and often the host cannot even tell if such
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* a device is attached to the system!
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*
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* These two nasty bits mean that we have to treat HP-IB as
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* an indirect bus. However, since we are given some ID
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* information, it is unreasonable to disallow cloning of
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* CS/80 devices.
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*
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* To deal with all of this, we use the semi-twisted scheme
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* in hpibbus_attach_children(). For each HP-IB slave, we loop
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* through all of the possibly-configured children, allowing
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* them to modify the punit parameter (but NOT the slave!).
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*
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* This is evil, but what can you do?
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*/
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static int
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hpibbusmatch(struct device *parent, struct cfdata *match, void *aux)
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{
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return (1);
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}
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static void
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hpibbusattach(struct device *parent, struct device *self, void *aux)
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{
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struct hpibbus_softc *sc = (struct hpibbus_softc *)self;
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struct hpibdev_attach_args *ha = aux;
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printf("\n");
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/* Get the operations vector for the controller. */
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sc->sc_ops = ha->ha_ops;
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sc->sc_type = ha->ha_type; /* XXX */
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sc->sc_ba = ha->ha_ba;
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*(ha->ha_softcpp) = sc; /* XXX */
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hpibreset(device_unit(self)); /* XXX souldn't be here */
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/*
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* Initialize the DMA queue entry.
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*/
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sc->sc_dq = malloc(sizeof(struct dmaqueue), M_DEVBUF, M_NOWAIT);
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if (sc->sc_dq == NULL) {
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printf("%s: can't allocate DMA queue entry\n", self->dv_xname);
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return;
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}
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sc->sc_dq->dq_softc = sc;
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sc->sc_dq->dq_start = hpibstart;
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sc->sc_dq->dq_done = hpibdone;
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/* Initialize the slave request queue. */
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TAILQ_INIT(&sc->sc_queue);
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/* Attach any devices on the bus. */
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hpibbus_attach_children(sc);
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}
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static void
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hpibbus_attach_children(struct hpibbus_softc *sc)
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{
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struct hpibbus_attach_args ha;
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int slave;
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for (slave = 0; slave < 8; slave++) {
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/*
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* Get the ID tag for the device, if any.
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* Plotters won't identify themselves, and
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* get the same value as non-existent devices.
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*/
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ha.ha_id = hpibid(device_unit(&sc->sc_dev), slave);
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ha.ha_slave = slave; /* not to be modified by children */
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ha.ha_punit = 0; /* children modify this */
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/*
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* Search though all configured children for this bus.
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*/
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config_search_ia(hpibbussearch, &sc->sc_dev, "hpibbus", &ha);
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}
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}
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static int
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hpibbussearch(struct device *parent, struct cfdata *cf,
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const int *ldesc, void *aux)
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{
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struct hpibbus_softc *sc = (struct hpibbus_softc *)parent;
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struct hpibbus_attach_args *ha = aux;
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/* Make sure this is in a consistent state. */
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ha->ha_punit = 0;
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if (config_match(parent, cf, ha) > 0) {
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/*
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* The device probe has succeeded, and filled in
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* the punit information. Make sure the configuration
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* allows for this slave/punit combination.
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*/
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if (cf->hpibbuscf_slave != HPIBBUSCF_SLAVE_DEFAULT &&
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cf->hpibbuscf_slave != ha->ha_slave)
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goto out;
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if (cf->hpibbuscf_punit != HPIBBUSCF_PUNIT_DEFAULT &&
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cf->hpibbuscf_punit != ha->ha_punit)
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goto out;
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/*
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* Allocate the device's address from the bus's
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* resource map.
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*/
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if (hpibbus_alloc(sc, ha->ha_slave, ha->ha_punit))
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goto out;
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/*
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* This device is allowed; attach it.
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*/
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config_attach(parent, cf, ha, hpibbusprint);
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}
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out:
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return (0);
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}
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static int
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hpibbusprint(void *aux, const char *pnp)
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{
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struct hpibbus_attach_args *ha = aux;
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aprint_normal(" slave %d punit %d", ha->ha_slave, ha->ha_punit);
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return (UNCONF);
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}
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int
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hpibdevprint(void *aux, const char *pnp)
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{
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/* only hpibbus's can attach to hpibdev's -- easy. */
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if (pnp != NULL)
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aprint_normal("hpibbus at %s", pnp);
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return (UNCONF);
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}
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void
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hpibreset(int unit)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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(*sc->sc_ops->hpib_reset)(sc);
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}
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int
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hpibreq(struct device *pdev, struct hpibqueue *hq)
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{
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struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev;
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int s;
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s = splhigh(); /* XXXthorpej */
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TAILQ_INSERT_TAIL(&sc->sc_queue, hq, hq_list);
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splx(s);
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if (sc->sc_queue.tqh_first == hq)
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return (1);
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return (0);
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}
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void
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hpibfree(struct device *pdev, struct hpibqueue *hq)
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{
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struct hpibbus_softc *sc = (struct hpibbus_softc *)pdev;
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int s;
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s = splhigh(); /* XXXthorpej */
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TAILQ_REMOVE(&sc->sc_queue, hq, hq_list);
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splx(s);
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if ((hq = sc->sc_queue.tqh_first) != NULL)
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(*hq->hq_start)(hq->hq_softc);
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}
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int
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hpibid(int unit, int slave)
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{
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short id;
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int ohpibtimeout;
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/*
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* XXX shorten timeout value so autoconfig doesn't
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* take forever on slow CPUs.
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*/
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ohpibtimeout = hpibtimeout;
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hpibtimeout = hpibidtimeout * (cpuspeed / 8);
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if (hpibrecv(unit, 31, slave, &id, 2) != 2)
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id = 0;
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hpibtimeout = ohpibtimeout;
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return(id);
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}
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int
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hpibsend(int unit, int slave, int sec, void *addr, int cnt)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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return ((*sc->sc_ops->hpib_send)(sc, slave, sec, addr, cnt));
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}
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int
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hpibrecv(int unit, int slave, int sec, void *addr, int cnt)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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return ((*sc->sc_ops->hpib_recv)(sc, slave, sec, addr, cnt));
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}
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int
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hpibpptest(int unit, int slave)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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return ((*sc->sc_ops->hpib_ppoll)(sc) & (0x80 >> slave));
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}
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void
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hpibppclear(int unit)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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sc->sc_flags &= ~HPIBF_PPOLL;
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}
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void
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hpibawait(int unit)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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sc->sc_flags |= HPIBF_PPOLL;
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(*sc->sc_ops->hpib_ppwatch)(sc);
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}
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int
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hpibswait(int unit, int slave)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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int timo = hpibtimeout;
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int mask, (*ppoll)(struct hpibbus_softc *);
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ppoll = sc->sc_ops->hpib_ppoll;
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mask = 0x80 >> slave;
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while (((*ppoll)(sc) & mask) == 0) {
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if (--timo == 0) {
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printf("%s: swait timeout\n", sc->sc_dev.dv_xname);
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return(-1);
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}
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}
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return(0);
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}
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int
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hpibustart(int unit)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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if (sc->sc_type == HPIBA)
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sc->sc_dq->dq_chan = DMA0;
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else
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sc->sc_dq->dq_chan = DMA0 | DMA1;
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if (dmareq(sc->sc_dq))
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return(1);
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return(0);
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}
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static void
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hpibstart(void *arg)
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{
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struct hpibbus_softc *sc = arg;
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struct hpibqueue *hq;
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hq = sc->sc_queue.tqh_first;
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(*hq->hq_go)(hq->hq_softc);
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}
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void
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hpibgo(int unit, int slave, int sec, void *vbuf, int count, int rw, int timo)
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{
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struct hpibbus_softc *sc = hpibbus_cd.cd_devs[unit];
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(*sc->sc_ops->hpib_go)(sc, slave, sec, vbuf, count, rw, timo);
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}
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static void
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hpibdone(void *arg)
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{
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struct hpibbus_softc *sc = arg;
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(*sc->sc_ops->hpib_done)(sc);
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}
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int
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hpibintr(void *arg)
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{
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struct hpibbus_softc *sc = arg;
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return ((sc->sc_ops->hpib_intr)(arg));
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}
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static int
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hpibbus_alloc(struct hpibbus_softc *sc, int slave, int punit)
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{
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if (slave >= HPIB_NSLAVES ||
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punit >= HPIB_NPUNITS)
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panic("hpibbus_alloc: device address out of range");
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if (sc->sc_rmap[slave][punit] == 0) {
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sc->sc_rmap[slave][punit] = 1;
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return (0);
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}
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return (1);
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}
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#if 0
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static void
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hpibbus_free(struct hpibbus_softc *sc, int slave, int punit)
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{
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if (slave >= HPIB_NSLAVES ||
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punit >= HPIB_NPUNITS)
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panic("hpibbus_free: device address out of range");
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#ifdef DIAGNOSTIC
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if (sc->sc_rmap[slave][punit] == 0)
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panic("hpibbus_free: not allocated");
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#endif
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sc->sc_rmap[slave][punit] = 0;
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}
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#endif
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