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[netbsd-mini2440.git] / sys / arch / evbarm / integrator / int_bus_dma.c

/*      $NetBSD: int_bus_dma.c,v 1.15 2007/03/04 05:59:45 christos Exp $        */

/*
 * Copyright (c) 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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.
 */

/*
 * PCI DMA support for the ARM Integrator.
 */

#define _ARM32_BUS_DMA_PRIVATE

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: int_bus_dma.c,v 1.15 2007/03/04 05:59:45 christos Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>

#include <uvm/uvm_extern.h>

#include <machine/bootconfig.h>

#include <evbarm/integrator/int_bus_dma.h>

struct integrator_dma_cookie {
        int     id_flags;       /* flags; see below */

        /*
         * Information about the original buffer used during
         * DMA map syncs.  Note that origbuflen is only used
         * for ID_BUFTYPE_LINEAR.
         */
        void    *id_origbuf;            /* pointer to orig buffer if
                                           bouncing */
        bus_size_t id_origbuflen;       /* ...and size */
        int     id_buftype;             /* type of buffer */

        void    *id_bouncebuf;          /* pointer to the bounce buffer */
        bus_size_t id_bouncebuflen;     /* ...and size */
        int     id_nbouncesegs;         /* number of valid bounce segs */
        bus_dma_segment_t id_bouncesegs[0]; /* array of bounce buffer
                                               physical memory segments */
};
/* id_flags */
#define ID_MIGHT_NEED_BOUNCE    0x01    /* map could need bounce buffers */
#define ID_HAS_BOUNCE           0x02    /* map currently has bounce buffers */
#define ID_IS_BOUNCING          0x04    /* map is bouncing current xfer */

/* id_buftype */
#define ID_BUFTYPE_INVALID      0
#define ID_BUFTYPE_LINEAR       1
#define ID_BUFTYPE_MBUF         2
#define ID_BUFTYPE_UIO          3
#define ID_BUFTYPE_RAW          4

#define DEBUG(x)

static struct arm32_dma_range integrator_dma_ranges[DRAM_BLOCKS];

extern BootConfig bootconfig;

static int integrator_bus_dmamap_create(bus_dma_tag_t, bus_size_t, int,
    bus_size_t, bus_size_t, int, bus_dmamap_t *);
static void integrator_bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
static int  integrator_bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *,
    bus_size_t, struct proc *, int);
static int  integrator_bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t,
    struct mbuf *, int);
static int  integrator_bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t,
    struct uio *, int);
static int  integrator_bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t,
    bus_dma_segment_t *, int, bus_size_t, int);
static void integrator_bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t);
static void integrator_bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t,
    bus_addr_t, bus_size_t, int);
static int  integrator_bus_dmamem_alloc(bus_dma_tag_t, bus_size_t,
    bus_size_t, bus_size_t, bus_dma_segment_t *, int, int *, int);
static int  integrator_dma_alloc_bouncebuf(bus_dma_tag_t, bus_dmamap_t,
    bus_size_t, int);
static void integrator_dma_free_bouncebuf(bus_dma_tag_t, bus_dmamap_t);


/*
 * Create an Integrator DMA map.
 */
static int
integrator_bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments,
    bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp)
{
        struct integrator_dma_cookie *cookie;
        bus_dmamap_t map;
        int error, cookieflags;
        void *cookiestore;
        size_t cookiesize;

        DEBUG(printf("I_bus_dmamap_create(tag %x, size %x, nseg %d, max %x,"
            " boundary %x, flags %x, dmamap %p)\n", (unsigned) t,
            (unsigned) size, nsegments, (unsigned) maxsegsz,
            (unsigned)boundary, flags, dmamp));

        /* Call common function to create the basic map. */
        error = _bus_dmamap_create(t, size, nsegments, maxsegsz, boundary,
            flags, dmamp);
        if (error)
                return (error);

        map = *dmamp;
        map->_dm_cookie = NULL;

        cookiesize = sizeof(struct integrator_dma_cookie);

        /*
         * Some CM boards have private memory which is significantly
         * faster than the normal memory stick.  To support this
         * memory we have to bounce any DMA transfers.
         *
         * In order to DMA to arbitrary buffers, we use "bounce
         * buffers" - pages in in the main PCI visible memory.  On DMA
         * reads, DMA happens to the bounce buffers, and is copied
         * into the caller's buffer.  On writes, data is copied into
         * but bounce buffer, and the DMA happens from those pages.
         * To software using the DMA mapping interface, this looks
         * simply like a data cache.
         *
         * If we have private RAM in the system, we may need bounce
         * buffers.  We check and remember that here.
         */
#if 0
        cookieflags = ID_MIGHT_NEED_BOUNCE;
#else
        cookieflags = 0;
#endif
        cookiesize += (sizeof(bus_dma_segment_t) * map->_dm_segcnt);

        /*
         * Allocate our cookie.
         */
        if ((cookiestore = malloc(cookiesize, M_DMAMAP,
            (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL) {
                error = ENOMEM;
                goto out;
        }
        memset(cookiestore, 0, cookiesize);
        cookie = (struct integrator_dma_cookie *)cookiestore;
        cookie->id_flags = cookieflags;
        map->_dm_cookie = cookie;

        if (cookieflags & ID_MIGHT_NEED_BOUNCE) {
                /*
                 * Allocate the bounce pages now if the caller
                 * wishes us to do so.
                 */
                if ((flags & BUS_DMA_ALLOCNOW) == 0)
                        goto out;

                DEBUG(printf("I_bus_dmamap_create bouncebuf alloc\n"));
                error = integrator_dma_alloc_bouncebuf(t, map, size, flags);
        }

 out:
        if (error) {
                if (map->_dm_cookie != NULL)
                        free(map->_dm_cookie, M_DMAMAP);
                _bus_dmamap_destroy(t, map);
                printf("I_bus_dmamap_create failed (%d)\n", error);
        }
        return (error);
}

/*
 * Destroy an ISA DMA map.
 */
static void
integrator_bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map)
{
        struct integrator_dma_cookie *cookie = map->_dm_cookie;

        DEBUG(printf("I_bus_dmamap_destroy (tag %x, map %x)\n", (unsigned) t,
            (unsigned) map));
        /*
         * Free any bounce pages this map might hold.
         */
        if (cookie->id_flags & ID_HAS_BOUNCE) {
                DEBUG(printf("I_bus_dmamap_destroy bouncebuf\n"));
                integrator_dma_free_bouncebuf(t, map);
        }

        free(cookie, M_DMAMAP);
        _bus_dmamap_destroy(t, map);
}

/*
 * Load an Integrator DMA map with a linear buffer.
 */
static int
integrator_bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
    bus_size_t buflen, struct proc *p, int flags)
{
        struct integrator_dma_cookie *cookie = map->_dm_cookie;
        int error;

        DEBUG(printf("I_bus_dmamap_load (tag %x, map %x, buf %p, len %u,"
            " proc %p, flags %d)\n", (unsigned) t, (unsigned) map, buf,
            (unsigned) buflen, p, flags));
        /*
         * Make sure that on error condition we return "no valid mappings."
         */
        map->dm_mapsize = 0;
        map->dm_nsegs = 0;

        /*
         * Try to load the map the normal way.  If this errors out,
         * and we can bounce, we will.
         */
        error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
        if (error == 0 ||
            (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0))
                return (error);

        /*
         * First attempt failed; bounce it.
         */

        /*
         * Allocate bounce pages, if necessary.
         */
        if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) {
                DEBUG(printf("I_bus_dmamap_load alloc bouncebuf\n"));
                error = integrator_dma_alloc_bouncebuf(t, map, buflen, flags);
                if (error)
                        return (error);
        }

        /*
         * Cache a pointer to the caller's buffer and load the DMA map
         * with the bounce buffer.
         */
        cookie->id_origbuf = buf;
        cookie->id_origbuflen = buflen;
        cookie->id_buftype = ID_BUFTYPE_LINEAR;
        error = _bus_dmamap_load(t, map, cookie->id_bouncebuf, buflen,
            NULL, flags);
        if (error) {
                /*
                 * Free the bounce pages, unless our resources
                 * are reserved for our exclusive use.
                 */
                if ((map->_dm_flags & BUS_DMA_ALLOCNOW) == 0)
                        integrator_dma_free_bouncebuf(t, map);
                return (error);
        }

        /* ...so integrator_bus_dmamap_sync() knows we're bouncing */
        cookie->id_flags |= ID_IS_BOUNCING;
        return (0);
}

/*
 * Like integrator_bus_dmamap_load(), but for mbufs.
 */
static int
integrator_bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map,
    struct mbuf *m0, int flags)
{
        struct integrator_dma_cookie *cookie = map->_dm_cookie;
        int error;

        /*
         * Make sure that on error condition we return "no valid mappings."
         */
        map->dm_mapsize = 0;
        map->dm_nsegs = 0;

#ifdef DIAGNOSTIC
        if ((m0->m_flags & M_PKTHDR) == 0)
                panic("integrator_bus_dmamap_load_mbuf: no packet header");
#endif

        if (m0->m_pkthdr.len > map->_dm_size)
                return (EINVAL);

        /*
         * Try to load the map the normal way.  If this errors out,
         * and we can bounce, we will.
         */
        error = _bus_dmamap_load_mbuf(t, map, m0, flags);
        if (error == 0 ||
            (error != 0 && (cookie->id_flags & ID_MIGHT_NEED_BOUNCE) == 0))
                return (error);

        /*
         * First attempt failed; bounce it.
         *
         * Allocate bounce pages, if necessary.
         */
        if ((cookie->id_flags & ID_HAS_BOUNCE) == 0) {
                error = integrator_dma_alloc_bouncebuf(t, map,
                    m0->m_pkthdr.len, flags);
                if (error)
                        return (error);
        }

        /*
         * Cache a pointer to the caller's buffer and load the DMA map
         * with the bounce buffer.
         */
        cookie->id_origbuf = m0;
        cookie->id_origbuflen = m0->m_pkthdr.len;       /* not really used */
        cookie->id_buftype = ID_BUFTYPE_MBUF;
        error = _bus_dmamap_load(t, map, cookie->id_bouncebuf,
            m0->m_pkthdr.len, NULL, flags);
        if (error) {
                /*
                 * Free the bounce pages, unless our resources
                 * are reserved for our exclusive use.
                 */
                if ((map->_dm_flags & BUS_DMA_ALLOCNOW) == 0)
                        integrator_dma_free_bouncebuf(t, map);
                return (error);
        }

        /* ...so integrator_bus_dmamap_sync() knows we're bouncing */
        cookie->id_flags |= ID_IS_BOUNCING;
        return (0);
}

/*
 * Like integrator_bus_dmamap_load(), but for uios.
 */
static int
integrator_bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map,
    struct uio *uio, int flags)
{

        panic("integrator_bus_dmamap_load_uio: not implemented");
}

/*
 * Like intgrator_bus_dmamap_load(), but for raw memory allocated with
 * bus_dmamem_alloc().
 */
static int
integrator_bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map,
    bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags)
{

        panic("integrator_bus_dmamap_load_raw: not implemented");
}

/*
 * Unload an Integrator DMA map.
 */
static void
integrator_bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map)
{
        struct integrator_dma_cookie *cookie = map->_dm_cookie;

        /*
         * If we have bounce pages, free them, unless they're
         * reserved for our exclusive use.
         */
        if ((cookie->id_flags & ID_HAS_BOUNCE) &&
            (map->_dm_flags & BUS_DMA_ALLOCNOW) == 0)
                integrator_dma_free_bouncebuf(t, map);

        cookie->id_flags &= ~ID_IS_BOUNCING;
        cookie->id_buftype = ID_BUFTYPE_INVALID;

        /*
         * Do the generic bits of the unload.
         */
        _bus_dmamap_unload(t, map);
}

/*
 * Synchronize an Integrator DMA map.
 */
static void
integrator_bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map,
    bus_addr_t offset, bus_size_t len, int ops)
{
        struct integrator_dma_cookie *cookie = map->_dm_cookie;

        DEBUG(printf("I_bus_dmamap_sync (tag %x, map %x, offset %x, size %u,"
            " ops %d\n", (unsigned)t, (unsigned)map, (unsigned)offset ,
            (unsigned)len, ops));
        /*
         * Mixing PRE and POST operations is not allowed.
         */
        if ((ops & (BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE)) != 0 &&
            (ops & (BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE)) != 0)
                panic("integrator_bus_dmamap_sync: mix PRE and POST");

#ifdef DIAGNOSTIC
        if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) != 0) {
                if (offset >= map->dm_mapsize)
                        panic("integrator_bus_dmamap_sync: bad offset");
                if (len == 0 || (offset + len) > map->dm_mapsize)
                        panic("integrator_bus_dmamap_sync: bad length");
        }
#endif

        /*
         * If we're not bouncing then use the standard code.
         */
        if ((cookie->id_flags & ID_IS_BOUNCING) == 0) {
                _bus_dmamap_sync(t, map, offset, len, ops);
                return;
        }

        DEBUG(printf("dmamap_sync(");
        if (ops & BUS_DMASYNC_PREREAD)
                printf("preread ");
        if (ops & BUS_DMASYNC_PREWRITE)
                printf("prewrite ");
        if (ops & BUS_DMASYNC_POSTREAD)
                printf("postread ");
        if (ops & BUS_DMASYNC_POSTWRITE)
                printf("postwrite ");)

        switch (cookie->id_buftype) {
        case ID_BUFTYPE_LINEAR:
                if (ops & BUS_DMASYNC_PREWRITE) {
                        /*
                         * Copy the caller's buffer to the bounce buffer.
                         */
                        memcpy((uint8_t *)cookie->id_bouncebuf + offset,
                            (uint8_t *)cookie->id_origbuf + offset, len);
                        cpu_dcache_wbinv_range((vaddr_t)cookie->id_bouncebuf +
                            offset, len);
                }
                if (ops & BUS_DMASYNC_PREREAD) {
                        cpu_dcache_wbinv_range((vaddr_t)cookie->id_bouncebuf +
                            offset, len);
                }
                if (ops & BUS_DMASYNC_POSTREAD) {
                        /*
                         * Copy the bounce buffer to the caller's buffer.
                         */
                        memcpy((uint8_t *)cookie->id_origbuf + offset,
                            (uint8_t *)cookie->id_bouncebuf + offset, len);
                }

                /*
                 * Nothing to do for post-write.
                 */
                break;

        case ID_BUFTYPE_MBUF:
            {
                struct mbuf *m, *m0 = cookie->id_origbuf;
                bus_size_t minlen, moff;

                if (ops & BUS_DMASYNC_PREWRITE) {
                        /*
                         * Copy the caller's buffer to the bounce buffer.
                         */
                        m_copydata(m0, offset, len,
                            (uint8_t *)cookie->id_bouncebuf + offset);
                        cpu_dcache_wb_range((vaddr_t)cookie->id_bouncebuf +
                            offset, len);
                }
                if (ops & BUS_DMASYNC_PREREAD) {
                        cpu_dcache_wbinv_range ((vaddr_t)cookie->id_bouncebuf +
                            offset, len);
                }
                if (ops & BUS_DMASYNC_POSTREAD) {
                        /*
                         * Copy the bounce buffer to the caller's buffer.
                         */
                        for (moff = offset, m = m0; m != NULL && len != 0;
                            m = m->m_next) {
                                /* Find the beginning mbuf. */
                                if (moff >= m->m_len) {
                                        moff -= m->m_len;
                                        continue;
                                }

                                /*
                                 * Now at the first mbuf to sync; nail
                                 * each one until we have exhausted the
                                 * length.
                                 */
                                minlen = len < m->m_len - moff ?
                                    len : m->m_len - moff;

                                memcpy(mtod(m, uint8_t *) + moff,
                                    (uint8_t *)cookie->id_bouncebuf + offset,
                                    minlen);

                                moff = 0;
                                len -= minlen;
                                offset += minlen;
                        }
                }
                /*
                 * Nothing to do for post-write.
                 */
                break;
            }
        
        case ID_BUFTYPE_UIO:
                panic("integrator_bus_dmamap_sync: ID_BUFTYPE_UIO");
                break;

        case ID_BUFTYPE_RAW:
                panic("integrator_bus_dmamap_sync: ID_BUFTYPE_RAW");
                break;

        case ID_BUFTYPE_INVALID:
                panic("integrator_bus_dmamap_sync: ID_BUFTYPE_INVALID");
                break;

        default:
                printf("unknown buffer type %d\n", cookie->id_buftype);
                panic("integrator_bus_dmamap_sync");
        }
}

/*
 * Allocate memory safe for Integrator DMA.
 */
static int
integrator_bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size,
    bus_size_t alignment, bus_size_t boundary, bus_dma_segment_t *segs,
    int nsegs, int *rsegs, int flags)
{

        if (t->_ranges == NULL)
                return (ENOMEM);

        /* _bus_dmamem_alloc() does the range checks for us. */
        return (_bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs,
            rsegs, flags));
}

/**********************************************************************
 * Integrator DMA utility functions
 **********************************************************************/

static int
integrator_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map,
    bus_size_t size, int flags)
{
        struct integrator_dma_cookie *cookie = map->_dm_cookie;
        int error = 0;

        DEBUG(printf("Alloc bouncebuf\n"));
        cookie->id_bouncebuflen = round_page(size);
        error = integrator_bus_dmamem_alloc(t, cookie->id_bouncebuflen,
            NBPG, map->_dm_boundary, cookie->id_bouncesegs,
            map->_dm_segcnt, &cookie->id_nbouncesegs, flags);
        if (error)
                goto out;
        {
                int seg;

                for (seg = 0; seg < cookie->id_nbouncesegs; seg++)
                        DEBUG(printf("Seg %d @ PA 0x%08x+0x%x\n", seg,
                            (unsigned) cookie->id_bouncesegs[seg].ds_addr,
                            (unsigned) cookie->id_bouncesegs[seg].ds_len));
        }
        error = _bus_dmamem_map(t, cookie->id_bouncesegs,
            cookie->id_nbouncesegs, cookie->id_bouncebuflen,
            (void **)&cookie->id_bouncebuf, flags);

 out:
        if (error) {
                _bus_dmamem_free(t, cookie->id_bouncesegs,
                    cookie->id_nbouncesegs);
                cookie->id_bouncebuflen = 0;
                cookie->id_nbouncesegs = 0;
        } else {
                DEBUG(printf("Alloc bouncebuf OK\n"));
                cookie->id_flags |= ID_HAS_BOUNCE;
        }

        return (error);
}

static void
integrator_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map)
{
        struct integrator_dma_cookie *cookie = map->_dm_cookie;

        _bus_dmamem_unmap(t, cookie->id_bouncebuf,
            cookie->id_bouncebuflen);
        _bus_dmamem_free(t, cookie->id_bouncesegs,
            cookie->id_nbouncesegs);
        cookie->id_bouncebuflen = 0;
        cookie->id_nbouncesegs = 0;
        cookie->id_flags &= ~ID_HAS_BOUNCE;
}

void
integrator_pci_dma_init(bus_dma_tag_t dmat)
{
        struct arm32_dma_range *dr = integrator_dma_ranges;
        int i;
        int nranges = 0;
        
        for (i = 0; i < bootconfig.dramblocks; i++)
                if (bootconfig.dram[i].flags & BOOT_DRAM_CAN_DMA) {
                        dr[nranges].dr_sysbase = bootconfig.dram[i].address;
                        dr[nranges].dr_busbase = 
                            LOCAL_TO_CM_ALIAS(dr[nranges].dr_sysbase);
                        dr[nranges].dr_len = bootconfig.dram[i].pages * NBPG;
                        nranges++;
                }

        if (nranges == 0)
                panic ("integrator_pci_dma_init: No DMA capable memory"); 

        dmat->_ranges = dr;
        dmat->_nranges = nranges;

        dmat->_dmamap_create = integrator_bus_dmamap_create;
        dmat->_dmamap_destroy = integrator_bus_dmamap_destroy;
        dmat->_dmamap_load = integrator_bus_dmamap_load;
        dmat->_dmamap_load_mbuf = integrator_bus_dmamap_load_mbuf;
        dmat->_dmamap_load_uio = integrator_bus_dmamap_load_uio;
        dmat->_dmamap_load_raw = integrator_bus_dmamap_load_raw;
        dmat->_dmamap_unload = integrator_bus_dmamap_unload;
        dmat->_dmamap_sync_pre = integrator_bus_dmamap_sync;
        dmat->_dmamap_sync_post = integrator_bus_dmamap_sync;

        dmat->_dmamem_alloc = integrator_bus_dmamem_alloc;
        dmat->_dmamem_free = _bus_dmamem_free;
        dmat->_dmamem_map = _bus_dmamem_map;
        dmat->_dmamem_unmap = _bus_dmamem_unmap;
        dmat->_dmamem_mmap = _bus_dmamem_mmap;
}