FreeBSD/Linux Kernel Cross Reference
sys/dev/raid/amr/amr_pci.c

     /*-
      * Copyright (c) 1999,2000 Michael Smith
      * Copyright (c) 2000 BSDi
      * 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 AUTHOR 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 AUTHOR 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) 2002 Eric Moore
     * Copyright (c) 2002, 2004 LSI Logic Corporation
     * 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. The party using or redistributing the source code and binary forms
     *    agrees to the disclaimer below and the terms and conditions set forth
     *    herein.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD: src/sys/dev/amr/amr_pci.c,v 1.40 2007/12/12 05:55:03 scottl Exp $
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    #include <sys/sysctl.h>
    
    #include <sys/bio.h>
    #include <sys/bus.h>
    #include <sys/conf.h>
    
    #include <sys/rman.h>
    
    #include <bus/pci/pcireg.h>
    #include <bus/pci/pcivar.h>
    
    #include <dev/raid/amr/amrio.h>
    #include <dev/raid/amr/amrreg.h>
    #include <dev/raid/amr/amrvar.h>
    
    static int              amr_pci_probe(device_t dev);
    static int              amr_pci_attach(device_t dev);
    static int              amr_pci_detach(device_t dev);
    static int              amr_pci_shutdown(device_t dev);
    static int              amr_pci_suspend(device_t dev);
    static int              amr_pci_resume(device_t dev);
    static void             amr_pci_intr(void *arg);
    static void             amr_pci_free(struct amr_softc *sc);
    static void             amr_sglist_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error);
    static int              amr_sglist_map(struct amr_softc *sc);
    static int              amr_setup_mbox(struct amr_softc *sc);
    static int              amr_ccb_map(struct amr_softc *sc);
    
    static u_int amr_force_sg32 = 0;
    TUNABLE_INT("hw.amr.force_sg32", &amr_force_sg32);
    SYSCTL_DECL(_hw_amr);
    SYSCTL_UINT(_hw_amr, OID_AUTO, force_sg32, CTLFLAG_RD, &amr_force_sg32, 0,
        "Force the AMR driver to use 32bit scatter gather");
    
    static device_method_t amr_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,     amr_pci_probe),
       DEVMETHOD(device_attach,    amr_pci_attach),
       DEVMETHOD(device_detach,    amr_pci_detach),
       DEVMETHOD(device_shutdown,  amr_pci_shutdown),
       DEVMETHOD(device_suspend,   amr_pci_suspend),
       DEVMETHOD(device_resume,    amr_pci_resume),
   
       DEVMETHOD(bus_print_child,  bus_generic_print_child),
       DEVMETHOD(bus_driver_added, bus_generic_driver_added),
       DEVMETHOD_END
   };
   
   static driver_t amr_pci_driver = {
           "amr",
           amr_methods,
           sizeof(struct amr_softc)
   };
   
   static devclass_t       amr_devclass;
   DRIVER_MODULE(amr, pci, amr_pci_driver, amr_devclass, NULL, NULL);
   MODULE_VERSION(amr, 1);
   MODULE_DEPEND(amr, pci, 1, 1, 1);
   MODULE_DEPEND(amr, cam, 1, 1, 1);
   
   static struct amr_ident
   {
       int         vendor;
       int         device;
       int         flags;
   #define AMR_ID_PROBE_SIG        (1<<0)  /* generic i960RD, check signature */
   #define AMR_ID_DO_SG64          (1<<1)
   #define AMR_ID_QUARTZ           (1<<2)
   } amr_device_ids[] = {
       {0x101e, 0x9010, 0},
       {0x101e, 0x9060, 0},
       {0x8086, 0x1960, AMR_ID_QUARTZ | AMR_ID_PROBE_SIG},
       {0x101e, 0x1960, AMR_ID_QUARTZ},
       {0x1000, 0x1960, AMR_ID_QUARTZ | AMR_ID_DO_SG64 | AMR_ID_PROBE_SIG},
       {0x1000, 0x0407, AMR_ID_QUARTZ | AMR_ID_DO_SG64},
       {0x1000, 0x0408, AMR_ID_QUARTZ | AMR_ID_DO_SG64},
       {0x1000, 0x0409, AMR_ID_QUARTZ | AMR_ID_DO_SG64},
       {0x1028, 0x000e, AMR_ID_QUARTZ | AMR_ID_DO_SG64 | AMR_ID_PROBE_SIG}, /* perc4/di i960 */
       {0x1028, 0x000f, AMR_ID_QUARTZ | AMR_ID_DO_SG64}, /* perc4/di Verde*/
       {0x1028, 0x0013, AMR_ID_QUARTZ | AMR_ID_DO_SG64}, /* perc4/di */
       {0, 0, 0}
   };
   
   static struct amr_ident *
   amr_find_ident(device_t dev)
   {
       struct amr_ident *id;
       int sig;
   
       for (id = amr_device_ids; id->vendor != 0; id++) {
           if ((pci_get_vendor(dev) == id->vendor) &&
               (pci_get_device(dev) == id->device)) {
   
               /* do we need to test for a signature? */
               if (id->flags & AMR_ID_PROBE_SIG) {
                   sig = pci_read_config(dev, AMR_CFG_SIG, 2);
                   if ((sig != AMR_SIGNATURE_1) && (sig != AMR_SIGNATURE_2))
                       continue;
               }
               return (id);
           }
       }
       return (NULL);
   }
   
   static int
   amr_pci_probe(device_t dev)
   {
   
       debug_called(1);
   
       if (amr_find_ident(dev) != NULL) {
           device_set_desc(dev, LSI_DESC_PCI);
           return(BUS_PROBE_DEFAULT);
       }
       return(ENXIO);
   }
   
   static int
   amr_pci_attach(device_t dev)
   {
       struct amr_softc    *sc;
       struct amr_ident    *id;
       int                 rid, rtype, error;
       u_int32_t           command;
   
       debug_called(1);
   
       /*
        * Initialise softc.
        */
       sc = device_get_softc(dev);
       bzero(sc, sizeof(*sc));
       sc->amr_dev = dev;
   
       /* assume failure is 'not configured' */
       error = ENXIO;
   
       /*
        * Determine board type.
        */
       if ((id = amr_find_ident(dev)) == NULL)
           return (ENXIO);
   
       command = pci_read_config(dev, PCIR_COMMAND, 1);
       if (id->flags & AMR_ID_QUARTZ) {
           /*
            * Make sure we are going to be able to talk to this board.
            */
           if ((command & PCIM_CMD_MEMEN) == 0) {
               device_printf(dev, "memory window not available\n");
               return (ENXIO);
           }
           sc->amr_type |= AMR_TYPE_QUARTZ;
       } else {
           /*
            * Make sure we are going to be able to talk to this board.
            */
           if ((command & PCIM_CMD_PORTEN) == 0) {
               device_printf(dev, "I/O window not available\n");
               return (ENXIO);
           }
       }
   
       if ((amr_force_sg32 == 0) && (id->flags & AMR_ID_DO_SG64) &&
           (sizeof(vm_paddr_t) > 4)) {
           device_printf(dev, "Using 64-bit DMA\n");
           sc->amr_type |= AMR_TYPE_SG64;
       }
   
       /* force the busmaster enable bit on */
       if (!(command & PCIM_CMD_BUSMASTEREN)) {
           device_printf(dev, "busmaster bit not set, enabling\n");
           command |= PCIM_CMD_BUSMASTEREN;
           pci_write_config(dev, PCIR_COMMAND, command, 2);
       }
   
       /*
        * Allocate the PCI register window.
        */
       rid = PCIR_BAR(0);
       rtype = AMR_IS_QUARTZ(sc) ? SYS_RES_MEMORY : SYS_RES_IOPORT;
       sc->amr_reg = bus_alloc_resource_any(dev, rtype, &rid, RF_ACTIVE);
       if (sc->amr_reg == NULL) {
           device_printf(sc->amr_dev, "can't allocate register window\n");
           goto out;
       }
       sc->amr_btag = rman_get_bustag(sc->amr_reg);
       sc->amr_bhandle = rman_get_bushandle(sc->amr_reg);
   
       /*
        * Allocate and connect our interrupt.
        */
       rid = 0;
       sc->amr_irq = bus_alloc_resource_any(sc->amr_dev, SYS_RES_IRQ, &rid,
           RF_SHAREABLE | RF_ACTIVE);
       if (sc->amr_irq == NULL) {
           device_printf(sc->amr_dev, "can't allocate interrupt\n");
           goto out;
       }
       if (bus_setup_intr(sc->amr_dev, sc->amr_irq,
           INTR_MPSAFE, amr_pci_intr,
           sc, &sc->amr_intr, NULL)) {
           device_printf(sc->amr_dev, "can't set up interrupt\n");
           goto out;
       }
   
       debug(2, "interrupt attached");
   
       /* assume failure is 'out of memory' */
       error = ENOMEM;
   
       /*
        * Allocate the parent bus DMA tag appropriate for PCI.
        */
       if (bus_dma_tag_create(NULL,                        /* parent */
                              1, 0,                        /* alignment,boundary */
                              AMR_IS_SG64(sc) ?
                              BUS_SPACE_MAXADDR :
                              BUS_SPACE_MAXADDR_32BIT,     /* lowaddr */
                              BUS_SPACE_MAXADDR,           /* highaddr */
                              NULL, NULL,                  /* filter, filterarg */
                              MAXBSIZE, AMR_NSEG,          /* maxsize, nsegments */
                              BUS_SPACE_MAXSIZE_32BIT,     /* maxsegsize */
                              0,                           /* flags */
                              &sc->amr_parent_dmat)) {
           device_printf(dev, "can't allocate parent DMA tag\n");
           goto out;
       }
   
       /*
        * Create DMA tag for mapping buffers into controller-addressable space.
        */
       if (bus_dma_tag_create(sc->amr_parent_dmat,         /* parent */
                              1, 0,                        /* alignment,boundary */
                              BUS_SPACE_MAXADDR_32BIT,     /* lowaddr */
                              BUS_SPACE_MAXADDR,           /* highaddr */
                              NULL, NULL,                  /* filter, filterarg */
                              MAXBSIZE, AMR_NSEG,          /* maxsize, nsegments */
                              MAXBSIZE,                    /* maxsegsize */
                              0,           /* flags */
                              &sc->amr_buffer_dmat)) {
           device_printf(sc->amr_dev, "can't allocate buffer DMA tag\n");
           goto out;
       }
   
       if (bus_dma_tag_create(sc->amr_parent_dmat,         /* parent */
                              1, 0,                        /* alignment,boundary */
                              BUS_SPACE_MAXADDR,           /* lowaddr */
                              BUS_SPACE_MAXADDR,           /* highaddr */
                              NULL, NULL,                  /* filter, filterarg */
                              MAXBSIZE, AMR_NSEG,          /* maxsize, nsegments */
                              MAXBSIZE,                    /* maxsegsize */
                              0,           /* flags */
                              &sc->amr_buffer64_dmat)) {
           device_printf(sc->amr_dev, "can't allocate buffer DMA tag\n");
           goto out;
       }
   
       debug(2, "dma tag done");
   
       /*
        * Allocate and set up mailbox in a bus-visible fashion.
        */
       lockinit(&sc->amr_list_lock, "AMR List Lock", 0, LK_CANRECURSE);
       lockinit(&sc->amr_hw_lock, "AMR HW Lock", 0, LK_CANRECURSE);
       if ((error = amr_setup_mbox(sc)) != 0)
           goto out;
   
       debug(2, "mailbox setup");
   
       /*
        * Build the scatter/gather buffers.
        */
       if ((error = amr_sglist_map(sc)) != 0)
           goto out;
       debug(2, "s/g list mapped");
   
       if ((error = amr_ccb_map(sc)) != 0)
           goto out;
       debug(2, "ccb mapped");
   
   
       /*
        * Do bus-independant initialisation, bring controller online.
        */
       error = amr_attach(sc);
   
   out:
       if (error)
           amr_pci_free(sc);
       return(error);
   }
   
   /********************************************************************************
    * Disconnect from the controller completely, in preparation for unload.
    */
   static int
   amr_pci_detach(device_t dev)
   {
       struct amr_softc    *sc = device_get_softc(dev);
       int                 error;
   
       debug_called(1);
   
       if (sc->amr_state & AMR_STATE_OPEN)
           return(EBUSY);
   
       if ((error = amr_pci_shutdown(dev)))
           return(error);
   
       amr_pci_free(sc);
   
       return(0);
   }
   
   /********************************************************************************
    * Bring the controller down to a dormant state and detach all child devices.
    *
    * This function is called before detach, system shutdown, or before performing
    * an operation which may add or delete system disks.  (Call amr_startup to
    * resume normal operation.)
    *
    * Note that we can assume that the bioq on the controller is empty, as we won't
    * allow shutdown if any device is open.
    */
   static int
   amr_pci_shutdown(device_t dev)
   {
       struct amr_softc    *sc = device_get_softc(dev);
       int                 i,error;
   
       debug_called(1);
   
       /* mark ourselves as in-shutdown */
       sc->amr_state |= AMR_STATE_SHUTDOWN;
   
   
       /* flush controller */
       device_printf(sc->amr_dev, "flushing cache...");
       kprintf("%s\n", amr_flush(sc) ? "failed" : "done");
   
       error = 0;
   
       /* delete all our child devices */
       for(i = 0 ; i < AMR_MAXLD; i++) {
           if( sc->amr_drive[i].al_disk != NULL) {
               if((error = device_delete_child(sc->amr_dev,sc->amr_drive[i].al_disk)) != 0)
                   goto shutdown_out;
               sc->amr_drive[i].al_disk = NULL;
           }
       }
   
       /* XXX disable interrupts? */
   
   shutdown_out:
       return(error);
   }
   
   /********************************************************************************
    * Bring the controller to a quiescent state, ready for system suspend.
    */
   static int
   amr_pci_suspend(device_t dev)
   {
       struct amr_softc    *sc = device_get_softc(dev);
   
       debug_called(1);
   
       sc->amr_state |= AMR_STATE_SUSPEND;
   
       /* flush controller */
       device_printf(sc->amr_dev, "flushing cache...");
       kprintf("%s\n", amr_flush(sc) ? "failed" : "done");
       
       /* XXX disable interrupts? */
   
       return(0);
   }
   
   /********************************************************************************
    * Bring the controller back to a state ready for operation.
    */
   static int
   amr_pci_resume(device_t dev)
   {
       struct amr_softc    *sc = device_get_softc(dev);
   
       debug_called(1);
   
       sc->amr_state &= ~AMR_STATE_SUSPEND;
   
       /* XXX enable interrupts? */
   
       return(0);
   }
   
   /*******************************************************************************
    * Take an interrupt, or be poked by other code to look for interrupt-worthy
    * status.
    */
   static void
   amr_pci_intr(void *arg)
   {
       struct amr_softc    *sc = (struct amr_softc *)arg;
   
       debug_called(3);
   
       /* collect finished commands, queue anything waiting */
       amr_done(sc);
   }
   
   /********************************************************************************
    * Free all of the resources associated with (sc)
    *
    * Should not be called if the controller is active.
    */
   static void
   amr_pci_free(struct amr_softc *sc)
   {
       void *p;
   
       debug_called(1);
   
       amr_free(sc);
   
       /* destroy data-transfer DMA tag */
       if (sc->amr_buffer_dmat)
           bus_dma_tag_destroy(sc->amr_buffer_dmat);
       if (sc->amr_buffer64_dmat)
           bus_dma_tag_destroy(sc->amr_buffer64_dmat);
   
       /* free and destroy DMA memory and tag for passthrough pool */
       if (sc->amr_ccb)
           bus_dmamem_free(sc->amr_ccb_dmat, sc->amr_ccb, sc->amr_ccb_dmamap);
       if (sc->amr_ccb_dmat)
           bus_dma_tag_destroy(sc->amr_ccb_dmat);
   
       /* free and destroy DMA memory and tag for s/g lists */
       if (sc->amr_sgtable)
           bus_dmamem_free(sc->amr_sg_dmat, sc->amr_sgtable, sc->amr_sg_dmamap);
       if (sc->amr_sg_dmat)
           bus_dma_tag_destroy(sc->amr_sg_dmat);
   
       /* free and destroy DMA memory and tag for mailbox */
       p = (void *)(uintptr_t)(volatile void *)sc->amr_mailbox64;
       if (sc->amr_mailbox) {
           bus_dmamem_free(sc->amr_mailbox_dmat, p, sc->amr_mailbox_dmamap);
       }
       if (sc->amr_mailbox_dmat)
           bus_dma_tag_destroy(sc->amr_mailbox_dmat);
   
       /* disconnect the interrupt handler */
       if (sc->amr_intr)
           bus_teardown_intr(sc->amr_dev, sc->amr_irq, sc->amr_intr);
       if (sc->amr_irq != NULL)
           bus_release_resource(sc->amr_dev, SYS_RES_IRQ, 0, sc->amr_irq);
   
       /* destroy the parent DMA tag */
       if (sc->amr_parent_dmat)
           bus_dma_tag_destroy(sc->amr_parent_dmat);
   
       /* release the register window mapping */
       if (sc->amr_reg != NULL)
           bus_release_resource(sc->amr_dev,
                                AMR_IS_QUARTZ(sc) ? SYS_RES_MEMORY : SYS_RES_IOPORT,
                                PCIR_BAR(0), sc->amr_reg);
   }
   
   /********************************************************************************
    * Allocate and map the scatter/gather table in bus space.
    */
   static void
   amr_sglist_helper(void *arg, bus_dma_segment_t *segs, int nseg, int error)
   {
       uint32_t *addr;
   
       debug_called(1);
   
       addr = arg;
       *addr = segs[0].ds_addr;
   }
   
   static int
   amr_sglist_map(struct amr_softc *sc)
   {
       size_t      segsize;
       void        *p;
       int         error;
   
       debug_called(1);
   
       /*
        * Create a single tag describing a region large enough to hold all of
        * the s/g lists we will need.
        *
        * Note that we could probably use AMR_LIMITCMD here, but that may become
        * tunable.
        */
       if (AMR_IS_SG64(sc))
           segsize = sizeof(struct amr_sg64entry) * AMR_NSEG * AMR_MAXCMD;
       else
           segsize = sizeof(struct amr_sgentry) * AMR_NSEG * AMR_MAXCMD;
   
       error = bus_dma_tag_create(sc->amr_parent_dmat,     /* parent */
                                  512, 0,                  /* alignment,boundary */
                                  BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
                                  BUS_SPACE_MAXADDR,       /* highaddr */
                                  NULL, NULL,              /* filter, filterarg */
                                  segsize, 1,              /* maxsize, nsegments */
                                  BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
                                  0,                       /* flags */
                                  &sc->amr_sg_dmat);
       if (error != 0) {
           device_printf(sc->amr_dev, "can't allocate scatter/gather DMA tag\n");
           return(ENOMEM);
       }
   
       /*
        * Allocate enough s/g maps for all commands and permanently map them into
        * controller-visible space.
        *  
        * XXX this assumes we can get enough space for all the s/g maps in one 
        * contiguous slab.  We may need to switch to a more complex arrangement
        * where we allocate in smaller chunks and keep a lookup table from slot
        * to bus address.
        *
        * XXX HACK ALERT:  at least some controllers don't like the s/g memory
        *                  being allocated below 0x2000.  We leak some memory if
        *                  we get some below this mark and allocate again.  We
        *                  should be able to avoid this with the tag setup, but
        *                  that does't seem to work.
        */
   retry:
       error = bus_dmamem_alloc(sc->amr_sg_dmat, &p, BUS_DMA_NOWAIT,
                                &sc->amr_sg_dmamap);
       if (error) {
           device_printf(sc->amr_dev, "can't allocate s/g table\n");
           return(ENOMEM);
       }
       bus_dmamap_load(sc->amr_sg_dmat, sc->amr_sg_dmamap, p, segsize, amr_sglist_helper, &sc->amr_sgbusaddr, 0);
       if (sc->amr_sgbusaddr < 0x2000) {
           debug(1, "s/g table too low (0x%x), reallocating\n", sc->amr_sgbusaddr);
           goto retry;
       }
   
       if (AMR_IS_SG64(sc))
           sc->amr_sg64table = (struct amr_sg64entry *)p;
       sc->amr_sgtable = (struct amr_sgentry *)p;
   
       return(0);
   }
   
   /********************************************************************************
    * Allocate and set up mailbox areas for the controller (sc)
    *
    * The basic mailbox structure should be 16-byte aligned.
    */
   static int
   amr_setup_mbox(struct amr_softc *sc)
   {
       int         error;
       void        *p;
       uint32_t    baddr;
       
       debug_called(1);
   
       /*
        * Create a single tag describing a region large enough to hold the entire
        * mailbox.
        */
       error = bus_dma_tag_create(sc->amr_parent_dmat,     /* parent */
                                  16, 0,                   /* alignment,boundary */
                                  BUS_SPACE_MAXADDR_32BIT, /* lowaddr */
                                  BUS_SPACE_MAXADDR,       /* highaddr */
                                  NULL, NULL,              /* filter, filterarg */
                                  sizeof(struct amr_mailbox64), /* maxsize */
                                  1,                       /* nsegments */
                                  BUS_SPACE_MAXSIZE_32BIT, /* maxsegsize */
                                  0,                       /* flags */
                                  &sc->amr_mailbox_dmat);
       if (error != 0) {
           device_printf(sc->amr_dev, "can't allocate mailbox tag\n");
           return(ENOMEM);
       }
   
       /*
        * Allocate the mailbox structure and permanently map it into
        * controller-visible space.
        */
       error = bus_dmamem_alloc(sc->amr_mailbox_dmat, &p, BUS_DMA_NOWAIT,
                                &sc->amr_mailbox_dmamap);
       if (error) {
           device_printf(sc->amr_dev, "can't allocate mailbox memory\n");
           return(ENOMEM);
       }
       bus_dmamap_load(sc->amr_mailbox_dmat, sc->amr_mailbox_dmamap, p,
                       sizeof(struct amr_mailbox64), amr_sglist_helper, &baddr, 0);
       /*
        * Conventional mailbox is inside the mailbox64 region.
        */
       /* save physical base of the basic mailbox structure */
       sc->amr_mailboxphys = baddr + offsetof(struct amr_mailbox64, mb);
       bzero(p, sizeof(struct amr_mailbox64));
       sc->amr_mailbox64 = (struct amr_mailbox64 *)p;
       sc->amr_mailbox = &sc->amr_mailbox64->mb;
   
       return(0);
   }
   
   static int
   amr_ccb_map(struct amr_softc *sc)
   {
       int         ccbsize, error;
   
       /*
        * Passthrough and Extended passthrough structures will share the same
        * memory.
        */
       ccbsize = sizeof(union amr_ccb) * AMR_MAXCMD;
       error = bus_dma_tag_create(sc->amr_parent_dmat,     /* parent */
                                   128, 0,                 /* alignment,boundary */
                                   BUS_SPACE_MAXADDR_32BIT,/* lowaddr */
                                   BUS_SPACE_MAXADDR,      /* highaddr */
                                   NULL, NULL,             /* filter, filterarg */
                                   ccbsize,                /* maxsize */
                                   1,                      /* nsegments */
                                   ccbsize,                /* maxsegsize */
                                   0,                      /* flags */
                                   &sc->amr_ccb_dmat);
       if (error != 0) {
           device_printf(sc->amr_dev, "can't allocate ccb tag\n");
           return (ENOMEM);
       }
   
       error = bus_dmamem_alloc(sc->amr_ccb_dmat, (void **)&sc->amr_ccb,
                                BUS_DMA_NOWAIT, &sc->amr_ccb_dmamap);
       if (error) {
           device_printf(sc->amr_dev, "can't allocate ccb memory\n");
           return (ENOMEM);
       }
       bus_dmamap_load(sc->amr_ccb_dmat, sc->amr_ccb_dmamap, sc->amr_ccb,
                       ccbsize, amr_sglist_helper, &sc->amr_ccb_busaddr, 0);
       bzero(sc->amr_ccb, ccbsize);
   
       return (0);
   }

Cache object: 448933a9d900b29ed447147ef7861621