FreeBSD/Linux Kernel Cross Reference
sys/dev/qbus/uba.c

     /*      $NetBSD: uba.c,v 1.83 2021/08/07 16:19:15 thorpej Exp $    */
     /*
      * Copyright (c) 1982, 1986 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.
     *
     *      @(#)uba.c       7.10 (Berkeley) 12/16/90
     *      @(#)autoconf.c  7.20 (Berkeley) 5/9/91
     */
    
    /*
     * Copyright (c) 1996 Jonathan Stone.
     * Copyright (c) 1994, 1996 Ludd, University of Lule}, Sweden.
     * 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.
     *
     * 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.
     *
     *      @(#)uba.c       7.10 (Berkeley) 12/16/90
     *      @(#)autoconf.c  7.20 (Berkeley) 5/9/91
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: uba.c,v 1.83 2021/08/07 16:19:15 thorpej Exp $");
    
    #include <sys/param.h>
    #include <sys/time.h>
    #include <sys/systm.h>
    #include <sys/buf.h>
    #include <sys/proc.h>
    #include <sys/conf.h>
    #include <sys/kernel.h>
    #include <sys/malloc.h>
    #include <sys/device.h>
    
    #include <sys/bus.h>
    #include <machine/scb.h>
    #include <sys/cpu.h>
    
    #include <dev/qbus/ubareg.h>
    #include <dev/qbus/ubavar.h>
    
    #include "ioconf.h"
    #include "locators.h"
    
    static int ubasearch (device_t, cfdata_t,
                          const int *, void *);
    static int ubaprint (void *, const char *);
    
    /*
     * If we failed to allocate uba resources, put us on a queue to wait
     * until there is available resources. Resources to compete about
     * are map registers and BDPs. This is normally only a problem on
     * Unibus systems, Qbus systems have more map registers than usable.
     */
    void
    uba_enqueue(struct uba_unit *uu)
    {
           struct uba_softc *uh;
           int s;
   
           uh = device_private(device_parent(uu->uu_dev));
   
           s = spluba();
           SIMPLEQ_INSERT_TAIL(&uh->uh_resq, uu, uu_resq);
           splx(s);
   }
   
   /*
    * When a routine that uses resources is finished, the next device
    * in queue for map registers etc is called. If it succeeds to get
    * resources, call next, and next, and next...
    * This routine must be called at spluba.
    */
   void
   uba_done(struct uba_softc *uh)
   {
           struct uba_unit *uu;
   
           while ((uu = SIMPLEQ_FIRST(&uh->uh_resq))) {
                   SIMPLEQ_REMOVE_HEAD(&uh->uh_resq, uu_resq);
                   if ((*uu->uu_ready)(uu) == 0) {
                           SIMPLEQ_INSERT_HEAD(&uh->uh_resq, uu, uu_resq);
                           break;
                   }
           }
   }
   
   /*
    * Each device that needs some handling if an ubareset occurs must
    * register for reset first through this routine.
    */
   void
   uba_reset_establish(void (*reset)(device_t), device_t dev)
   {
           struct uba_softc *uh = device_private(device_parent(dev));
           struct uba_reset *ur;
   
           ur = malloc(sizeof(struct uba_reset), M_DEVBUF, M_WAITOK|M_ZERO);
           ur->ur_dev = dev;
           ur->ur_reset = reset;
   
           SIMPLEQ_INSERT_TAIL(&uh->uh_resetq, ur, ur_resetq);
   }
   
   /*
    * Allocate a bunch of map registers and map them to the given address.
    */
   int
   uballoc(struct uba_softc *uh, struct ubinfo *ui, int flags)
   {
           int waitok = (flags & UBA_CANTWAIT) == 0;
           int error;
   
           if ((error = bus_dmamap_create(uh->uh_dmat, ui->ui_size, 1,
               ui->ui_size, 0, (waitok ? BUS_DMA_WAITOK : BUS_DMA_NOWAIT),
               &ui->ui_dmam)))
                   return error;
   
           if ((error = bus_dmamap_load(uh->uh_dmat, ui->ui_dmam, ui->ui_vaddr,
               ui->ui_size, NULL, (waitok ? BUS_DMA_WAITOK : BUS_DMA_NOWAIT)))) {
                   bus_dmamap_destroy(uh->uh_dmat, ui->ui_dmam);
                   return error;
           }
           ui->ui_baddr = ui->ui_dmam->dm_segs[0].ds_addr;
           return 0;
   }
   
   /*
    * Allocate DMA-able memory and map it on the unibus.
    */
   int
   ubmemalloc(struct uba_softc *uh, struct ubinfo *ui, int flags)
   {
           int waitok = (flags & UBA_CANTWAIT ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK);
           int error;
   
           if ((error = bus_dmamem_alloc(uh->uh_dmat, ui->ui_size, PAGE_SIZE, 0,
               &ui->ui_seg, 1, &ui->ui_rseg, waitok)))
                   return error;
           if ((error = bus_dmamem_map(uh->uh_dmat, &ui->ui_seg, ui->ui_rseg,
               ui->ui_size, &ui->ui_vaddr, waitok|BUS_DMA_COHERENT))) {
                   bus_dmamem_free(uh->uh_dmat, &ui->ui_seg, ui->ui_rseg);
                   return error;
           }
           if ((error = uballoc(uh, ui, flags))) {
                   bus_dmamem_unmap(uh->uh_dmat, ui->ui_vaddr, ui->ui_size);
                   bus_dmamem_free(uh->uh_dmat, &ui->ui_seg, ui->ui_rseg);
           }
           return error;
   }
   
   void
   ubfree(struct uba_softc *uh, struct ubinfo *ui)
   {
           bus_dmamap_unload(uh->uh_dmat, ui->ui_dmam);
           bus_dmamap_destroy(uh->uh_dmat, ui->ui_dmam);
   }
   
   void
   ubmemfree(struct uba_softc *uh, struct ubinfo *ui)
   {
           bus_dmamem_unmap(uh->uh_dmat, ui->ui_vaddr, ui->ui_size);
           bus_dmamem_free(uh->uh_dmat, &ui->ui_seg, ui->ui_rseg);
           ubfree(uh, ui);
   }
   
   /*
    * Generate a reset on uba number uban.  Then
    * call each device that asked to be called during attach,
    * giving it a chance to clean up so as to be able to continue.
    */
   void
   ubareset(struct uba_softc *uh)
   {
           struct uba_reset *ur;
           int s;
   
           s = spluba();
           SIMPLEQ_INIT(&uh->uh_resq);
           printf("%s: reset", device_xname(uh->uh_dev));
           (*uh->uh_ubainit)(uh);
   
           ur = SIMPLEQ_FIRST(&uh->uh_resetq);
           if (ur) do {
                   printf(" %s", device_xname(ur->ur_dev));
                   (*ur->ur_reset)(ur->ur_dev);
           } while ((ur = SIMPLEQ_NEXT(ur, ur_resetq)));
   
           printf("\n");
           splx(s);
   }
   
   /*
    * The common attach routine:
    *   Calls the scan routine to search for uba devices.
    */
   void
   uba_attach(struct uba_softc *sc, paddr_t iopagephys)
   {
   
           /*
            * Set last free interrupt vector for devices with
            * programmable interrupt vectors.  Use is to decrement
            * this number and use result as interrupt vector.
            */
           sc->uh_lastiv = 0x200;
           SIMPLEQ_INIT(&sc->uh_resq);
           SIMPLEQ_INIT(&sc->uh_resetq);
   
           /*
            * Allocate place for unibus I/O space in virtual space.
            */
           if (bus_space_map(sc->uh_iot, iopagephys, UBAIOSIZE, 0, &sc->uh_ioh))
                   return;
   
           /*
            * Keep track of which addressed devices are found.
            */
           sc->uh_used = malloc(UBAIOSIZE, M_TEMP, M_WAITOK);
           memset(sc->uh_used, 0, UBAIOSIZE);
   
           if (sc->uh_beforescan)
                   (*sc->uh_beforescan)(sc);
           /*
            * Now start searching for devices.
            */
           config_search(sc->uh_dev, NULL,
               CFARGS(.search = ubasearch));
   
           if (sc->uh_afterscan)
                   (*sc->uh_afterscan)(sc);
   
           free(sc->uh_used, M_TEMP);
   }
   
   int
   ubasearch(device_t parent, cfdata_t cf, const int *ldesc, void *aux)
   {
           struct  uba_softc *sc = device_private(parent);
           struct  uba_attach_args ua;
           int     i, csr, vec, br;
   
           csr = cf->cf_loc[UBACF_CSR];
           if (sc->uh_used[ubdevreg(csr)])
                   return 0; /* something are already at this address */
   
           ua.ua_ioh = ubdevreg(csr) + sc->uh_ioh;
           ua.ua_iot = sc->uh_iot;
           ua.ua_dmat = sc->uh_dmat;
   
           if (badaddr((void *)ua.ua_ioh, 2) ||
               (sc->uh_errchk ? (*sc->uh_errchk)(sc):0))
                   goto forgetit;
   
           scb_vecref(0, 0); /* Clear vector ref */
           i = config_probe(parent, cf, &ua);
   
           if (sc->uh_errchk)
                   if ((*sc->uh_errchk)(sc))
                           goto forgetit;
           if (i == 0)
                   goto forgetit;
   
           i = scb_vecref(&vec, &br);
           if (i == 0)
                   goto fail;
           if (vec == 0)
                   goto fail;
   
           ua.ua_br = br;
           ua.ua_cvec = vec;
           ua.ua_iaddr = csr;
           ua.ua_evcnt = NULL;
   
           sc->uh_used[ubdevreg(csr)] = 1;
   
           config_attach(parent, cf, &ua, ubaprint, CFARGS_NONE);
           return 0;
   
   fail:
           printf("%s%d at %s csr %o %s\n",
               cf->cf_name, cf->cf_unit, device_xname(parent),
               csr, (i ? "zero vector" : "didn't interrupt"));
   
   forgetit:
           return 0;
   }
   
   /*
    * Print out some interesting info common to all unibus devices.
    */
   int
   ubaprint(void *aux, const char *uba)
   {
           struct uba_attach_args *ua = aux;
   
           aprint_normal(" csr %o vec %o ipl %x", ua->ua_iaddr,
               ua->ua_cvec & 511, ua->ua_br);
           return UNCONF;
   }
   
   /*
    * Move to machdep eventually
    */
   void
   uba_intr_establish(void *icookie, int vec, void (*ifunc)(void *iarg),
           void *iarg, struct evcnt *ev)
   {
           scb_vecalloc(vec, ifunc, iarg, SCB_ISTACK, ev);
   }

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