/* $NetBSD: hpib.c,v 1.38 2008/06/13 09:41:15 cegger Exp $ */ /*- * Copyright (c) 1996, 1997 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) 1982, 1990, 1993 * The Regents of the University of California. 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. * 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. * * @(#)hpib.c 8.2 (Berkeley) 1/12/94 */ /* * HP-IB bus driver */ #include __KERNEL_RCSID(0, "$NetBSD: hpib.c,v 1.38 2008/06/13 09:41:15 cegger Exp $"); #include #include #include #include #include #include #include #include #include #include "ioconf.h" static int hpibbusmatch(device_t, cfdata_t, void *); static void hpibbusattach(device_t, device_t, void *); CFATTACH_DECL_NEW(hpibbus, sizeof(struct hpibbus_softc), hpibbusmatch, hpibbusattach, NULL, NULL); static void hpibbus_attach_children(struct hpibbus_softc *); static int hpibbussearch(device_t, cfdata_t, const int *, void *); static int hpibbusprint(void *, const char *); static int hpibbus_alloc(struct hpibbus_softc *, int, int); #if 0 static void hpibbus_free(struct hpibbus_softc *, int, int); #endif static void hpibstart(void *); static void hpibdone(void *); int hpibtimeout = 100000; /* # of status tests before we give up */ int hpibidtimeout = 10000; /* # of status tests for hpibid() calls */ int hpibdmathresh = 3; /* byte count beyond which to attempt dma */ /* * HP-IB is essentially an IEEE 488 bus, with an HP command * set (CS/80 on `newer' devices, Amigo on before-you-were-born * devices) thrown on top. Devices that respond to CS/80 (and * probably Amigo, too) are tagged with a 16-bit ID. * * HP-IB has a 2-level addressing scheme; slave, the analog * of a SCSI ID, and punit, the analog of a SCSI LUN. Unforunately, * IDs are on a per-slave basis; punits are often used for disk * drives that have an accompanying tape drive on the second punit. * * In addition, not all HP-IB devices speak CS/80 or Amigo. * Examples of such devices are HP-IB plotters, which simply * take raw plotter commands over 488. These devices do not * have ID tags, and often the host cannot even tell if such * a device is attached to the system! * * These two nasty bits mean that we have to treat HP-IB as * an indirect bus. However, since we are given some ID * information, it is unreasonable to disallow cloning of * CS/80 devices. * * To deal with all of this, we use the semi-twisted scheme * in hpibbus_attach_children(). For each HP-IB slave, we loop * through all of the possibly-configured children, allowing * them to modify the punit parameter (but NOT the slave!). * * This is evil, but what can you do? */ static int hpibbusmatch(device_t parent, cfdata_t cf, void *aux) { return 1; } static void hpibbusattach(device_t parent, device_t self, void *aux) { struct hpibbus_softc *sc = device_private(self); struct hpibdev_attach_args *ha = aux; sc->sc_dev = self; aprint_normal("\n"); /* Get the operations vector for the controller. */ sc->sc_ops = ha->ha_ops; sc->sc_type = ha->ha_type; /* XXX */ sc->sc_ba = ha->ha_ba; *(ha->ha_softcpp) = sc; /* XXX */ hpibreset(device_unit(self)); /* XXX souldn't be here */ /* * Initialize the DMA queue entry. */ sc->sc_dq = malloc(sizeof(struct dmaqueue), M_DEVBUF, M_NOWAIT); if (sc->sc_dq == NULL) { aprint_error_dev(self, "can't allocate DMA queue entry\n"); return; } sc->sc_dq->dq_softc = sc; sc->sc_dq->dq_start = hpibstart; sc->sc_dq->dq_done = hpibdone; /* Initialize the slave request queue. */ TAILQ_INIT(&sc->sc_queue); /* Attach any devices on the bus. */ hpibbus_attach_children(sc); } static void hpibbus_attach_children(struct hpibbus_softc *sc) { struct hpibbus_attach_args ha; int slave; for (slave = 0; slave < 8; slave++) { /* * Get the ID tag for the device, if any. * Plotters won't identify themselves, and * get the same value as non-existent devices. */ ha.ha_id = hpibid(device_unit(sc->sc_dev), slave); ha.ha_slave = slave; /* not to be modified by children */ ha.ha_punit = 0; /* children modify this */ /* * Search though all configured children for this bus. */ config_search_ia(hpibbussearch, sc->sc_dev, "hpibbus", &ha); } } static int hpibbussearch(device_t parent, cfdata_t cf, const int *ldesc, void *aux) { struct hpibbus_softc *sc = device_private(parent); struct hpibbus_attach_args *ha = aux; /* Make sure this is in a consistent state. */ ha->ha_punit = 0; if (config_match(parent, cf, ha) > 0) { /* * The device probe has succeeded, and filled in * the punit information. Make sure the configuration * allows for this slave/punit combination. */ if (cf->hpibbuscf_slave != HPIBBUSCF_SLAVE_DEFAULT && cf->hpibbuscf_slave != ha->ha_slave) goto out; if (cf->hpibbuscf_punit != HPIBBUSCF_PUNIT_DEFAULT && cf->hpibbuscf_punit != ha->ha_punit) goto out; /* * Allocate the device's address from the bus's * resource map. */ if (hpibbus_alloc(sc, ha->ha_slave, ha->ha_punit)) goto out; /* * This device is allowed; attach it. */ config_attach(parent, cf, ha, hpibbusprint); } out: return 0; } static int hpibbusprint(void *aux, const char *pnp) { struct hpibbus_attach_args *ha = aux; aprint_normal(" slave %d punit %d", ha->ha_slave, ha->ha_punit); return UNCONF; } int hpibdevprint(void *aux, const char *pnp) { /* only hpibbus's can attach to hpibdev's -- easy. */ if (pnp != NULL) aprint_normal("hpibbus at %s", pnp); return UNCONF; } void hpibreset(int unit) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); (*sc->sc_ops->hpib_reset)(sc); } int hpibreq(struct device *pdev, struct hpibqueue *hq) { struct hpibbus_softc *sc = device_private(pdev); int s; s = splhigh(); /* XXXthorpej */ TAILQ_INSERT_TAIL(&sc->sc_queue, hq, hq_list); splx(s); if (TAILQ_FIRST(&sc->sc_queue) == hq) return 1; return 0; } void hpibfree(struct device *pdev, struct hpibqueue *hq) { struct hpibbus_softc *sc = device_private(pdev); int s; s = splhigh(); /* XXXthorpej */ TAILQ_REMOVE(&sc->sc_queue, hq, hq_list); splx(s); if ((hq = TAILQ_FIRST(&sc->sc_queue)) != NULL) (*hq->hq_start)(hq->hq_softc); } int hpibid(int unit, int slave) { short id; int ohpibtimeout; /* * XXX shorten timeout value so autoconfig doesn't * take forever on slow CPUs. */ ohpibtimeout = hpibtimeout; hpibtimeout = hpibidtimeout * (cpuspeed / 8); if (hpibrecv(unit, 31, slave, &id, 2) != 2) id = 0; hpibtimeout = ohpibtimeout; return id; } int hpibsend(int unit, int slave, int sec, void *addr, int cnt) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); return (*sc->sc_ops->hpib_send)(sc, slave, sec, addr, cnt); } int hpibrecv(int unit, int slave, int sec, void *addr, int cnt) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); return (*sc->sc_ops->hpib_recv)(sc, slave, sec, addr, cnt); } int hpibpptest(int unit, int slave) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); return (*sc->sc_ops->hpib_ppoll)(sc) & (0x80 >> slave); } void hpibppclear(int unit) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); sc->sc_flags &= ~HPIBF_PPOLL; } void hpibawait(int unit) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd, unit); sc->sc_flags |= HPIBF_PPOLL; (*sc->sc_ops->hpib_ppwatch)(sc); } int hpibswait(int unit, int slave) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd, unit); int timo = hpibtimeout; int mask, (*ppoll)(struct hpibbus_softc *); ppoll = sc->sc_ops->hpib_ppoll; mask = 0x80 >> slave; while (((*ppoll)(sc) & mask) == 0) { if (--timo == 0) { printf("%s: swait timeout\n", device_xname(sc->sc_dev)); return -1; } } return 0; } int hpibustart(int unit) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); if (sc->sc_type == HPIBA) sc->sc_dq->dq_chan = DMA0; else sc->sc_dq->dq_chan = DMA0 | DMA1; if (dmareq(sc->sc_dq)) return 1; return 0; } static void hpibstart(void *arg) { struct hpibbus_softc *sc = arg; struct hpibqueue *hq; hq = TAILQ_FIRST(&sc->sc_queue); (*hq->hq_go)(hq->hq_softc); } void hpibgo(int unit, int slave, int sec, void *vbuf, int count, int rw, int timo) { struct hpibbus_softc *sc = device_lookup_private(&hpibbus_cd,unit); (*sc->sc_ops->hpib_go)(sc, slave, sec, vbuf, count, rw, timo); } static void hpibdone(void *arg) { struct hpibbus_softc *sc = arg; (*sc->sc_ops->hpib_done)(sc); } int hpibintr(void *arg) { struct hpibbus_softc *sc = arg; return (sc->sc_ops->hpib_intr)(arg); } static int hpibbus_alloc(struct hpibbus_softc *sc, int slave, int punit) { if (slave >= HPIB_NSLAVES || punit >= HPIB_NPUNITS) panic("hpibbus_alloc: device address out of range"); if (sc->sc_rmap[slave][punit] == 0) { sc->sc_rmap[slave][punit] = 1; return 0; } return 1; } #if 0 static void hpibbus_free(struct hpibbus_softc *sc, int slave, int punit) { if (slave >= HPIB_NSLAVES || punit >= HPIB_NPUNITS) panic("hpibbus_free: device address out of range"); #ifdef DIAGNOSTIC if (sc->sc_rmap[slave][punit] == 0) panic("hpibbus_free: not allocated"); #endif sc->sc_rmap[slave][punit] = 0; } #endif