bus_dma(9) implementation for mvme88k, mostly based upon powerpc.

9 files changed, 777 insertions, 21 deletions

diff --git a/sys/arch/mvme88k/conf/files.mvme88k b/sys/arch/mvme88k/conf/files.mvme88k
index 00c51acde68..87343c135e9 100644
--- a/sys/arch/mvme88k/conf/files.mvme88k
+++ b/sys/arch/mvme88k/conf/files.mvme88k
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.mvme88k,v 1.27 2004/04/29 14:33:27 miod Exp $
+#	$OpenBSD: files.mvme88k,v 1.28 2004/05/07 18:10:26 miod Exp $
 #
 maxpartitions 16
 
@@ -76,6 +76,7 @@ file	netinet/in_cksum.c
 file	netns/ns_cksum.c				ns
 
 file	arch/mvme88k/mvme88k/autoconf.c
+file	arch/mvme88k/mvme88k/bus_dma.c
 file	arch/mvme88k/mvme88k/conf.c
 file	arch/mvme88k/mvme88k/m8820x.c			m88100
 file	arch/mvme88k/mvme88k/m88110.c			m88110
diff --git a/sys/arch/mvme88k/dev/bussw.c b/sys/arch/mvme88k/dev/bussw.c
index 1368cfd9a0d..a466f296a24 100644
--- a/sys/arch/mvme88k/dev/bussw.c
+++ b/sys/arch/mvme88k/dev/bussw.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bussw.c,v 1.13 2004/04/24 19:51:47 miod Exp $ */
+/*	$OpenBSD: bussw.c,v 1.14 2004/05/07 18:10:28 miod Exp $ */
 /*
  * Copyright (c) 1999 Steve Murphree, Jr.
  *
@@ -41,7 +41,6 @@
 
 struct bussw_softc {
 	struct device		sc_dev;
-	paddr_t			sc_base;
 	struct intrhand 	sc_abih;	/* `abort' switch */
 	bus_space_tag_t		sc_iot;
 	bus_space_handle_t	sc_ioh;
@@ -110,7 +109,6 @@ bussw_attach(parent, self, args)
 
 	sc->sc_iot = ca->ca_iot;
 	sc->sc_ioh = ioh;
-	sc->sc_base = ca->ca_paddr;
 
 	bus_space_write_1(sc->sc_iot, ioh, BS_VBASE,
 	    bus_space_read_1(sc->sc_iot, ioh, BS_VBASE) | BS_VECBASE);
@@ -155,15 +153,15 @@ bussw_scan(parent, child, args)
 	void *child, *args;
 {
 	struct cfdata *cf = child;
-	struct bussw_softc *sc = (struct bussw_softc *)parent;
-	struct confargs oca;
+	struct confargs oca, *ca = args;
 
 	bzero(&oca, sizeof oca);
-	oca.ca_iot = sc->sc_iot;
+	oca.ca_iot = ca->ca_iot;
+	oca.ca_dmat = ca->ca_dmat;
 	oca.ca_offset = cf->cf_loc[0];
 	oca.ca_ipl = cf->cf_loc[1];
 	if (oca.ca_offset != -1) {
-		oca.ca_paddr = sc->sc_base + oca.ca_offset;
+		oca.ca_paddr = ca->ca_paddr + oca.ca_offset;
 	} else {
 		oca.ca_paddr = -1;
 	}
diff --git a/sys/arch/mvme88k/dev/mainbus.c b/sys/arch/mvme88k/dev/mainbus.c
index 12a17d1ce47..b13ed5a0060 100644
--- a/sys/arch/mvme88k/dev/mainbus.c
+++ b/sys/arch/mvme88k/dev/mainbus.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mainbus.c,v 1.11 2004/04/24 19:51:48 miod Exp $ */
+/*	$OpenBSD: mainbus.c,v 1.12 2004/05/07 18:10:28 miod Exp $ */
 /*
  * Copyright (c) 1998 Steve Murphree, Jr.
  * Copyright (c) 2004, Miodrag Vallat.
@@ -174,6 +174,7 @@ mainbus_scan(parent, child, args)
 
 	bzero(&oca, sizeof oca);
 	oca.ca_iot = &mainbus_bustag;
+	oca.ca_dmat = 0;	/* XXX no need for a meaningful value yet */
 	oca.ca_bustype = BUS_MAIN;
 	oca.ca_paddr = cf->cf_loc[0];
 	oca.ca_ipl = -1;
diff --git a/sys/arch/mvme88k/dev/pcctwo.c b/sys/arch/mvme88k/dev/pcctwo.c
index d084664a55f..5dd819704ec 100644
--- a/sys/arch/mvme88k/dev/pcctwo.c
+++ b/sys/arch/mvme88k/dev/pcctwo.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pcctwo.c,v 1.24 2004/04/24 19:51:48 miod Exp $ */
+/*	$OpenBSD: pcctwo.c,v 1.25 2004/05/07 18:10:28 miod Exp $ */
 /*
  * Copyright (c) 1995 Theo de Raadt
  * All rights reserved.
@@ -159,16 +159,16 @@ pcctwo_scan(parent, child, args)
 	void *child, *args;
 {
 	struct cfdata *cf = child;
-	struct pcctwosoftc *sc = (struct pcctwosoftc *)parent;
-	struct confargs oca;
+	struct confargs oca, *ca = args;
 
 	bzero(&oca, sizeof oca);
-	oca.ca_iot = sc->sc_iot;
+	oca.ca_iot = ca->ca_iot;
+	oca.ca_dmat = ca->ca_dmat;
 	oca.ca_offset = cf->cf_loc[0];
 	oca.ca_ipl = cf->cf_loc[1];
 	if (oca.ca_offset != -1) {
 		/* offset locator for pcctwo children is relative to segment */
-		oca.ca_paddr = sc->sc_base - PCC2_BASE + oca.ca_offset;
+		oca.ca_paddr = ca->ca_paddr + oca.ca_offset;
 	} else {
 		oca.ca_paddr = -1;
 	}
diff --git a/sys/arch/mvme88k/dev/syscon.c b/sys/arch/mvme88k/dev/syscon.c
index be60b4043d5..739c4f1bb55 100644
--- a/sys/arch/mvme88k/dev/syscon.c
+++ b/sys/arch/mvme88k/dev/syscon.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: syscon.c,v 1.19 2004/04/24 19:51:48 miod Exp $ */
+/*	$OpenBSD: syscon.c,v 1.20 2004/05/07 18:10:28 miod Exp $ */
 /*
  * Copyright (c) 1999 Steve Murphree, Jr.
  * All rights reserved.
@@ -104,6 +104,7 @@ syscon_scan(parent, child, args)
 
 	bzero(&oca, sizeof oca);
 	oca.ca_iot = ca->ca_iot;
+	oca.ca_dmat = ca->ca_dmat;
 	oca.ca_offset = cf->cf_loc[0];
 	oca.ca_ipl = cf->cf_loc[1];
 	if (oca.ca_offset != -1) {
diff --git a/sys/arch/mvme88k/dev/vme.c b/sys/arch/mvme88k/dev/vme.c
index d6e0abee9fe..650aacee8ae 100644
--- a/sys/arch/mvme88k/dev/vme.c
+++ b/sys/arch/mvme88k/dev/vme.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vme.c,v 1.35 2004/04/30 21:32:52 miod Exp $ */
+/*	$OpenBSD: vme.c,v 1.36 2004/05/07 18:10:28 miod Exp $ */
 /*
  * Copyright (c) 2004, Miodrag Vallat.
  * Copyright (c) 1999 Steve Murphree, Jr.
@@ -213,10 +213,11 @@ vmescan(parent, child, args, bustype)
 	int bustype;
 {
 	struct cfdata *cf = child;
-	struct confargs oca;
+	struct confargs oca, *ca = args;
 
 	bzero(&oca, sizeof oca);
 	oca.ca_iot = &vme_bustag;
+	oca.ca_dmat = ca->ca_dmat;
 	oca.ca_bustype = bustype;
 	oca.ca_paddr = cf->cf_loc[0];
 	oca.ca_vec = cf->cf_loc[1];
diff --git a/sys/arch/mvme88k/include/autoconf.h b/sys/arch/mvme88k/include/autoconf.h
index 10ab457ea94..6e64d776de5 100644
--- a/sys/arch/mvme88k/include/autoconf.h
+++ b/sys/arch/mvme88k/include/autoconf.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: autoconf.h,v 1.13 2004/04/24 19:51:48 miod Exp $ */
+/*	$OpenBSD: autoconf.h,v 1.14 2004/05/07 18:10:28 miod Exp $ */
 /*
  * Copyright (c) 1999, Steve Murphree, Jr.
  * Copyright (c) 1996 Nivas Madhur
@@ -40,7 +40,8 @@
 #include <machine/bus.h>
 
 struct confargs {
-	bus_space_tag_t	ca_iot;		/* bus access */
+	bus_space_tag_t	ca_iot;
+	bus_dma_tag_t	ca_dmat;	
 	int		ca_bustype;	/* bus type */
 	paddr_t		ca_paddr;	/* physical address */
 	int		ca_offset;	/* offset from parent */
diff --git a/sys/arch/mvme88k/include/bus.h b/sys/arch/mvme88k/include/bus.h
index c86dba34766..37f601d993c 100644
--- a/sys/arch/mvme88k/include/bus.h
+++ b/sys/arch/mvme88k/include/bus.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: bus.h,v 1.2 2004/04/30 21:32:54 miod Exp $	*/
+/*	$OpenBSD: bus.h,v 1.3 2004/05/07 18:10:28 miod Exp $	*/
 /*
  * Copyright (c) 2004, Miodrag Vallat.
  *
@@ -25,7 +25,7 @@
  */
 
 /*
- * Simple mvme88k bus_space implementation.
+ * Simple mvme88k bus_space and bus_dma implementation.
  *
  * Currently, we only need specific handling for 32 bit read/writes in D16
  * space, and this choice is made at compile time.  As a result, all the
@@ -719,4 +719,88 @@ void d16_bzero(void *, size_t);
 
 #endif	/* __BUS_SPACE_RESTRICT_D16__ */
 
+/*
+ * Bus DMA implementation
+ */
+
+#define	BUS_DMA_WAITOK		0x000	/* safe to sleep (pseudo-flag) */
+#define	BUS_DMA_NOWAIT		0x001	/* not safe to sleep */
+#define	BUS_DMA_ALLOCNOW	0x002	/* perform resource allocation now */
+#define	BUS_DMA_COHERENT	0x004	/* hint: map memory DMA coherent */
+#define	BUS_DMAMEM_NOSYNC	0x008
+#define	BUS_DMA_BUS1		0x010	/* placeholders for bus functions... */
+#define	BUS_DMA_BUS2		0x020
+#define	BUS_DMA_BUS3		0x040
+#define	BUS_DMA_BUS4		0x080
+#define	BUS_DMA_READ		0x100	/* mapping is device -> memory only */
+#define	BUS_DMA_WRITE		0x200	/* mapping is memory -> device only */
+#define	BUS_DMA_STREAMING	0x400	/* hint: sequential, unidirectional */
+
+#define BUS_DMASYNC_PREREAD	0x01
+#define BUS_DMASYNC_POSTREAD	0x02
+#define BUS_DMASYNC_PREWRITE	0x04
+#define BUS_DMASYNC_POSTWRITE	0x08
+
+typedef	u_int32_t	bus_dma_tag_t;	/* ignored, really */
+
+/*
+ *	bus_dma_segment_t
+ *
+ *	Describes a single contiguous DMA transaction.  Values
+ *	are suitable for programming into DMA registers.
+ */
+struct m88k_bus_dma_segment {
+	bus_addr_t	ds_addr;	/* DMA address */
+	bus_size_t	ds_len;		/* length of transfer */
+};
+typedef struct m88k_bus_dma_segment  bus_dma_segment_t;
+
+/*
+ *	bus_dmamap_t
+ *
+ *	Describes a DMA mapping.
+ */
+struct m88k_bus_dmamap {
+	bus_size_t	_dm_size;	/* largest DMA transfer mappable */
+	int		_dm_segcnt;	/* number of segs this map can map */
+	bus_size_t	_dm_maxsegsz;	/* largest possible segment */
+	bus_size_t	_dm_boundary;	/* don't cross this */
+
+	bus_size_t	dm_mapsize;	/* size of the mapping */
+	int		dm_nsegs;	/* # valid segments in mapping */
+	bus_dma_segment_t dm_segs[1];	/* segments; variable length */
+};
+typedef struct m88k_bus_dmamap		*bus_dmamap_t;
+
+struct mbuf;
+struct proc;
+struct uio;
+
+int	bus_dmamap_create(bus_dma_tag_t, bus_size_t, int, bus_size_t,
+	    bus_size_t, int, bus_dmamap_t *);
+void	bus_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
+int	bus_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *,
+	    bus_size_t, struct proc *, int);
+int	bus_dmamap_load_mbuf(bus_dma_tag_t, bus_dmamap_t,
+	    struct mbuf *, int);
+int	bus_dmamap_load_uio(bus_dma_tag_t, bus_dmamap_t,
+	    struct uio *, int);
+int	bus_dmamap_load_raw(bus_dma_tag_t, bus_dmamap_t, bus_dma_segment_t *,
+	    int, bus_size_t, int);
+void	bus_dmamap_unload(bus_dma_tag_t, bus_dmamap_t);
+void	bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_addr_t,
+	    bus_size_t, int);
+
+int	bus_dmamem_alloc(bus_dma_tag_t tag, bus_size_t size,
+	    bus_size_t alignment, bus_size_t boundary,
+	    bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags);
+void	bus_dmamem_free(bus_dma_tag_t tag, bus_dma_segment_t *segs,
+	    int nsegs);
+int	bus_dmamem_map(bus_dma_tag_t tag, bus_dma_segment_t *segs,
+	    int nsegs, size_t size, caddr_t *kvap, int flags);
+void	bus_dmamem_unmap(bus_dma_tag_t tag, caddr_t kva,
+	    size_t size);
+paddr_t bus_dmamem_mmap(bus_dma_tag_t tag, bus_dma_segment_t *segs,
+	    int nsegs, off_t off, int prot, int flags);
+
 #endif	/* _MVME88K_BUS_H_ */
diff --git a/sys/arch/mvme88k/mvme88k/bus_dma.c b/sys/arch/mvme88k/mvme88k/bus_dma.c
new file mode 100644
index 00000000000..6a5bf18f34b
--- /dev/null
+++ b/sys/arch/mvme88k/mvme88k/bus_dma.c
@@ -0,0 +1,669 @@
+/*      $OpenBSD: bus_dma.c,v 1.1 2004/05/07 18:10:28 miod Exp $	*/
+/*      $NetBSD: bus_dma.c,v 1.2 2001/06/10 02:31:25 briggs Exp $        */
+
+/*-
+ * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+ * NASA Ames Research Center.
+ *
+ * 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 by the NetBSD
+ *      Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 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.
+ */
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/user.h>
+#include <sys/extent.h>
+#include <sys/buf.h>
+#include <sys/device.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/file.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/mount.h>
+
+#include <uvm/uvm_extern.h>
+
+#include <machine/bus.h>
+#include <machine/cmmu.h>
+#include <machine/intr.h>
+
+int     _bus_dmamap_load_buffer(bus_dma_tag_t, bus_dmamap_t, void *,
+	    bus_size_t, struct proc *, int, paddr_t *, int *, int);
+
+int	_bus_dmamem_alloc_range(bus_dma_tag_t, bus_size_t, bus_size_t,
+	    bus_size_t, bus_dma_segment_t *, int, int *, int, paddr_t, paddr_t);
+
+/*
+ * Common function for DMA map creation.  May be called by bus-specific
+ * DMA map creation functions.
+ */
+int
+bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp)
+        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 m88k_bus_dmamap *map;
+        void *mapstore;
+        size_t mapsize;
+
+        /*
+         * Allocate and initialize the DMA map.  The end of the map
+         * is a variable-sized array of segments, so we allocate enough
+         * room for them in one shot.
+         *
+         * Note we don't preserve the WAITOK or NOWAIT flags.  Preservation
+         * of ALLOCNOW notifies others that we've reserved these resources,
+         * and they are not to be freed.
+         *
+         * The bus_dmamap_t includes one bus_dma_segment_t, hence
+         * the (nsegments - 1).
+         */
+        mapsize = sizeof(struct m88k_bus_dmamap) +
+            (sizeof(bus_dma_segment_t) * (nsegments - 1));
+        if ((mapstore = malloc(mapsize, M_DEVBUF,
+            (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
+                return (ENOMEM);
+
+        memset(mapstore, 0, mapsize);
+        map = (struct m88k_bus_dmamap *)mapstore;
+        map->_dm_size = size;
+        map->_dm_segcnt = nsegments;
+        map->_dm_maxsegsz = maxsegsz;
+        map->_dm_boundary = boundary;
+        map->dm_mapsize = 0;                /* no valid mappings */
+        map->dm_nsegs = 0;
+
+        *dmamp = map;
+        return (0);
+}
+
+/*
+ * Common function for DMA map destruction.  May be called by bus-specific
+ * DMA map destruction functions.
+ */
+void
+bus_dmamap_destroy(t, map)
+        bus_dma_tag_t t;
+        bus_dmamap_t map;
+{
+
+        free(map, M_DEVBUF);
+}
+
+/*
+ * Utility function to load a linear buffer.  lastaddrp holds state
+ * between invocations (for multiple-buffer loads).  segp contains
+ * the starting segment on entrance, and the ending segment on exit.
+ * first indicates if this is the first invocation of this function.
+ */
+int
+_bus_dmamap_load_buffer(t, map, buf, buflen, p, flags, lastaddrp, segp, first)
+        bus_dma_tag_t t;
+        bus_dmamap_t map;
+        void *buf;
+        bus_size_t buflen;
+        struct proc *p;
+        int flags;
+        paddr_t *lastaddrp;
+        int *segp;
+        int first;
+{
+        bus_size_t sgsize;
+        bus_addr_t curaddr, lastaddr, baddr, bmask;
+        vaddr_t vaddr = (vaddr_t)buf;
+        int seg;
+	pmap_t pmap;
+
+	if (p != NULL)
+		pmap = vm_map_pmap(&p->p_vmspace->vm_map);
+	else
+		pmap = pmap_kernel();
+
+        lastaddr = *lastaddrp;
+        bmask = ~(map->_dm_boundary - 1);
+
+        for (seg = *segp; buflen > 0 ; ) {
+                /*
+                 * Get the physical address for this segment.
+                 */
+		if (pmap_extract(pmap, vaddr, (paddr_t *)&curaddr) == FALSE)
+			return (EINVAL);
+
+                /*
+                 * Compute the segment size, and adjust counts.
+                 */
+                sgsize = PAGE_SIZE - ((u_long)vaddr & PGOFSET);
+                if (buflen < sgsize)
+                        sgsize = buflen;
+
+                /*
+                 * Make sure we don't cross any boundaries.
+                 */
+                if (map->_dm_boundary > 0) {
+                        baddr = (curaddr + map->_dm_boundary) & bmask;
+                        if (sgsize > (baddr - curaddr))
+                                sgsize = (baddr - curaddr);
+                }
+
+                /*
+                 * Insert chunk into a segment, coalescing with
+                 * the previous segment if possible.
+                 */
+                if (first) {
+                        map->dm_segs[seg].ds_addr = curaddr;
+                        map->dm_segs[seg].ds_len = sgsize;
+                        first = 0;
+                } else {
+                        if (curaddr == lastaddr &&
+                            (map->dm_segs[seg].ds_len + sgsize) <=
+                             map->_dm_maxsegsz &&
+                            (map->_dm_boundary == 0 ||
+                             (map->dm_segs[seg].ds_addr & bmask) ==
+                             (curaddr & bmask)))
+                                map->dm_segs[seg].ds_len += sgsize;
+                        else {
+                                if (++seg >= map->_dm_segcnt)
+                                        break;
+                                map->dm_segs[seg].ds_addr = curaddr;
+                                map->dm_segs[seg].ds_len = sgsize;
+                        }
+                }
+
+                lastaddr = curaddr + sgsize;
+                vaddr += sgsize;
+                buflen -= sgsize;
+        }
+
+        *segp = seg;
+        *lastaddrp = lastaddr;
+
+        /*
+         * Did we fit?
+         */
+        if (buflen != 0)
+                return (EFBIG);                /* XXX better return value here? */
+
+        return (0);
+}
+
+/*
+ * Common function for loading a DMA map with a linear buffer.  May
+ * be called by bus-specific DMA map load functions.
+ */
+int
+bus_dmamap_load(t, map, buf, buflen, p, flags)
+        bus_dma_tag_t t;
+        bus_dmamap_t map;
+        void *buf;
+        bus_size_t buflen;
+        struct proc *p;
+        int flags;
+{
+        paddr_t lastaddr;
+        int seg, error;
+
+        /*
+         * Make sure that on error condition we return "no valid mappings".
+         */
+        map->dm_mapsize = 0;
+        map->dm_nsegs = 0;
+
+        if (buflen > map->_dm_size)
+                return (EINVAL);
+
+        seg = 0;
+        error = _bus_dmamap_load_buffer(t, map, buf, buflen, p, flags,
+                &lastaddr, &seg, 1);
+        if (error == 0) {
+                map->dm_mapsize = buflen;
+                map->dm_nsegs = seg + 1;
+        }
+        return (error);
+}
+
+/*
+ * Like _bus_dmamap_load(), but for mbufs.
+ */
+int
+bus_dmamap_load_mbuf(t, map, m0, flags)
+        bus_dma_tag_t t;
+        bus_dmamap_t map;
+        struct mbuf *m0;
+        int flags;
+{
+        paddr_t lastaddr;
+        int seg, error, first;
+        struct mbuf *m;
+
+        /*
+         * 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("bus_dmamap_load_mbuf: no packet header");
+#endif
+
+        if (m0->m_pkthdr.len > map->_dm_size)
+                return (EINVAL);
+
+        first = 1;
+        seg = 0;
+        error = 0;
+        for (m = m0; m != NULL && error == 0; m = m->m_next) {
+                error = _bus_dmamap_load_buffer(t, map, m->m_data, m->m_len,
+                    NULL, flags, &lastaddr, &seg, first);
+                first = 0;
+        }
+        if (error == 0) {
+                map->dm_mapsize = m0->m_pkthdr.len;
+                map->dm_nsegs = seg + 1;
+        }
+        return (error);
+}
+
+/*
+ * Like _bus_dmamap_load(), but for uios.
+ */
+int
+bus_dmamap_load_uio(t, map, uio, flags)
+        bus_dma_tag_t t;
+        bus_dmamap_t map;
+        struct uio *uio;
+        int flags;
+{
+        paddr_t lastaddr;
+        int seg, i, error, first;
+        bus_size_t minlen, resid;
+        struct proc *p = NULL;
+        struct iovec *iov;
+        caddr_t addr;
+
+        /*
+         * Make sure that on error condition we return "no valid mappings."
+         */
+        map->dm_mapsize = 0;
+        map->dm_nsegs = 0;
+
+        resid = uio->uio_resid;
+        iov = uio->uio_iov;
+
+	if (resid > map->_dm_size)
+		return (EINVAL);
+
+        if (uio->uio_segflg == UIO_USERSPACE) {
+                p = uio->uio_procp;
+#ifdef DIAGNOSTIC
+                if (p == NULL)
+                        panic("bus_dmamap_load_uio: USERSPACE but no proc");
+#endif
+        }
+
+        first = 1;
+        seg = 0;
+        error = 0;
+        for (i = 0; i < uio->uio_iovcnt && resid != 0 && error == 0; i++) {
+                /*
+                 * Now at the first iovec to load.  Load each iovec
+                 * until we have exhausted the residual count.
+                 */
+                minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
+                addr = (caddr_t)iov[i].iov_base;
+
+                error = _bus_dmamap_load_buffer(t, map, addr, minlen,
+                    p, flags, &lastaddr, &seg, first);
+                first = 0;
+
+                resid -= minlen;
+        }
+        if (error == 0) {
+                map->dm_mapsize = uio->uio_resid;
+                map->dm_nsegs = seg + 1;
+        }
+        return (error);
+}
+
+/*
+ * Like bus_dmamap_load(), but for raw memory allocated with
+ * bus_dmamem_alloc().
+ */
+int
+bus_dmamap_load_raw(t, map, segs, nsegs, size, flags)
+	bus_dma_tag_t t;
+	bus_dmamap_t map;
+	bus_dma_segment_t *segs;
+	int nsegs;
+	bus_size_t size;
+	int flags;
+{
+	if (nsegs > map->_dm_segcnt || size > map->_dm_size)
+		return (EINVAL);
+
+	/*
+	 * Make sure we don't cross any boundaries.
+	 */
+	if (map->_dm_boundary) {
+		bus_addr_t bmask = ~(map->_dm_boundary - 1);
+		int i;
+
+		for (i = 0; i < nsegs; i++) {
+			if (segs[i].ds_len > map->_dm_maxsegsz)
+				return (EINVAL);
+			if ((segs[i].ds_addr & bmask) !=
+			    ((segs[i].ds_addr + segs[i].ds_len - 1) & bmask))
+				return (EINVAL);
+		}
+	}
+
+	bcopy(segs, map->dm_segs, nsegs * sizeof(*segs));
+	map->dm_nsegs = nsegs;
+	return (0);
+}
+
+/*
+ * Common function for unloading a DMA map.  May be called by
+ * chipset-specific DMA map unload functions.
+ */
+void
+bus_dmamap_unload(t, map)
+        bus_dma_tag_t t;
+        bus_dmamap_t map;
+{
+
+        /*
+         * No resources to free; just mark the mappings as
+         * invalid.
+         */
+        map->dm_mapsize = 0;
+        map->dm_nsegs = 0;
+}
+
+/*
+ * Common function for DMA map synchronization.  May be called
+ * by chipset-specific DMA map synchronization functions.
+ */
+
+void
+bus_dmamap_sync(t, map, offset, len, op)
+        bus_dma_tag_t t;
+        bus_dmamap_t map;
+	bus_addr_t offset;
+	bus_size_t len;
+	int op;
+{
+	int i;
+
+	switch (op) {
+	case BUS_DMASYNC_PREWRITE:
+		op = DMA_CACHE_SYNC;
+		break;
+	case BUS_DMASYNC_PREREAD:
+	case BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE:
+		op = DMA_CACHE_SYNC_INVAL;
+		break;
+	default:
+		return;
+	}
+
+	for (i = map->dm_nsegs; i--; )
+		dma_cachectl_pa(map->dm_segs[i].ds_addr, len, op);
+}
+
+/*
+ * Common function for DMA-safe memory allocation.  May be called
+ * by bus-specific DMA memory allocation functions.
+ */
+int
+bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags)
+        bus_dma_tag_t t;
+        bus_size_t size, alignment, boundary;
+        bus_dma_segment_t *segs;
+        int nsegs;
+        int *rsegs;
+        int flags;
+{
+        paddr_t avail_start = (paddr_t)-1, avail_end = 0;
+        int bank;
+
+        for (bank = 0; bank < vm_nphysseg; bank++) {
+                if (avail_start > vm_physmem[bank].avail_start << PGSHIFT)
+                        avail_start = vm_physmem[bank].avail_start << PGSHIFT;
+                if (avail_end < vm_physmem[bank].avail_end << PGSHIFT)
+                        avail_end = vm_physmem[bank].avail_end << PGSHIFT;
+        }
+
+        return _bus_dmamem_alloc_range(t, size, alignment, boundary, segs,
+            nsegs, rsegs, flags, avail_start, avail_end - PAGE_SIZE);
+}
+
+/*
+ * Common function for freeing DMA-safe memory.  May be called by
+ * bus-specific DMA memory free functions.
+ */
+void
+bus_dmamem_free(t, segs, nsegs)
+        bus_dma_tag_t t;
+        bus_dma_segment_t *segs;
+        int nsegs;
+{
+        struct vm_page *m;
+        bus_addr_t addr;
+        struct pglist mlist;
+        int curseg;
+
+        /*
+         * Build a list of pages to free back to the VM system.
+         */
+        TAILQ_INIT(&mlist);
+        for (curseg = 0; curseg < nsegs; curseg++) {
+                for (addr = segs[curseg].ds_addr;
+                    addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
+                    addr += PAGE_SIZE) {
+                        m = PHYS_TO_VM_PAGE(addr);
+                        TAILQ_INSERT_TAIL(&mlist, m, pageq);
+                }
+        }
+
+        uvm_pglistfree(&mlist);
+}
+
+/*
+ * Common function for mapping DMA-safe memory.  May be called by
+ * bus-specific DMA memory map functions.
+ */
+int
+bus_dmamem_map(t, segs, nsegs, size, kvap, flags)
+        bus_dma_tag_t t;
+        bus_dma_segment_t *segs;
+        int nsegs;
+        size_t size;
+        caddr_t *kvap;
+        int flags;
+{
+        vaddr_t va;
+        bus_addr_t addr;
+        int curseg;
+
+        size = round_page(size);
+
+        va = uvm_km_valloc(kernel_map, size);
+
+        if (va == 0)
+                return (ENOMEM);
+
+        *kvap = (caddr_t)va;
+
+        for (curseg = 0; curseg < nsegs; curseg++) {
+                for (addr = segs[curseg].ds_addr;
+                    addr < (segs[curseg].ds_addr + segs[curseg].ds_len);
+                    addr += PAGE_SIZE, va += PAGE_SIZE, size -= PAGE_SIZE) {
+                        if (size == 0)
+                                panic("bus_dmamem_map: size botch");
+                        pmap_enter(pmap_kernel(), va, addr,
+                            VM_PROT_READ | VM_PROT_WRITE,
+                            VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED);
+                }
+        }
+	pmap_update(pmap_kernel());
+
+        return (0);
+}
+
+/*
+ * Common function for unmapping DMA-safe memory.  May be called by
+ * bus-specific DMA memory unmapping functions.
+ */
+void
+bus_dmamem_unmap(t, kva, size)
+        bus_dma_tag_t t;
+        caddr_t kva;
+        size_t size;
+{
+
+#ifdef DIAGNOSTIC
+        if ((u_long)kva & PGOFSET)
+                panic("bus_dmamem_unmap");
+#endif
+
+        size = round_page(size);
+        uvm_km_free(kernel_map, (vaddr_t)kva, size);
+}
+
+/*
+ * Common functin for mmap(2)'ing DMA-safe memory.  May be called by
+ * bus-specific DMA mmap(2)'ing functions.
+ */
+paddr_t
+bus_dmamem_mmap(t, segs, nsegs, off, prot, flags)
+        bus_dma_tag_t t;
+        bus_dma_segment_t *segs;
+        int nsegs;
+        off_t off;
+        int prot, flags;
+{
+        int i;
+
+        for (i = 0; i < nsegs; i++) {
+#ifdef DIAGNOSTIC
+                if (off & PGOFSET)
+                        panic("bus_dmamem_mmap: offset unaligned");
+                if (segs[i].ds_addr & PGOFSET)
+                        panic("bus_dmamem_mmap: segment unaligned");
+                if (segs[i].ds_len & PGOFSET)
+                        panic("bus_dmamem_mmap: segment size not multiple"
+                            " of page size");
+#endif
+                if (off >= segs[i].ds_len) {
+                        off -= segs[i].ds_len;
+                        continue;
+                }
+
+                return (atop(segs[i].ds_addr + off));
+        }
+
+        /* Page not found. */
+        return (-1);
+}
+
+/*
+ * Allocate physical memory from the given physical address range.
+ * Called by DMA-safe memory allocation methods.
+ */
+int
+_bus_dmamem_alloc_range(t, size, alignment, boundary, segs, nsegs, rsegs,
+    flags, low, high)
+        bus_dma_tag_t t;
+        bus_size_t size, alignment, boundary;
+        bus_dma_segment_t *segs;
+        int nsegs;
+        int *rsegs;
+        int flags;
+        paddr_t low;
+        paddr_t high;
+{
+        paddr_t curaddr, lastaddr;
+        struct vm_page *m;
+        struct pglist mlist;
+        int curseg, error;
+
+        /* Always round the size. */
+        size = round_page(size);
+
+        /*
+         * Allocate pages from the VM system.
+         */
+        TAILQ_INIT(&mlist);
+        error = uvm_pglistalloc(size, low, high, alignment, boundary,
+            &mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0);
+        if (error)
+                return (error);
+
+        /*
+         * Compute the location, size, and number of segments actually
+         * returned by the VM code.
+         */
+        m = mlist.tqh_first;
+        curseg = 0;
+        lastaddr = segs[curseg].ds_addr = VM_PAGE_TO_PHYS(m);
+        segs[curseg].ds_len = PAGE_SIZE;
+        m = m->pageq.tqe_next;
+
+        for (; m != NULL; m = m->pageq.tqe_next) {
+                curaddr = VM_PAGE_TO_PHYS(m);
+#ifdef DIAGNOSTIC
+                if (curaddr < low || curaddr >= high) {
+                        panic("_bus_dmamem_alloc_range: uvm_pglistalloc "
+			    "returned non-sensical address 0x%lx\n", curaddr);
+                }
+#endif
+                if (curaddr == (lastaddr + PAGE_SIZE))
+                        segs[curseg].ds_len += PAGE_SIZE;
+                else {
+                        curseg++;
+                        segs[curseg].ds_addr = curaddr;
+                        segs[curseg].ds_len = PAGE_SIZE;
+                }
+                lastaddr = curaddr;
+        }
+
+        *rsegs = curseg + 1;
+
+        return (0);
+}