[src/trunk]: src/sys/arch/hpcmips bus_dma. taken from pmax.

[uch <uch%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/182c8073c43f
branches:  trunk
changeset: 484093:182c8073c43f
user:      uch <uch%NetBSD.org@localhost>
date:      Sat Mar 25 15:04:32 2000 +0000

description:
bus_dma. taken from pmax.

diffstat:

 sys/arch/hpcmips/hpcmips/bus_dma.c |  745 +++++++++++++++++++++++++++++++++++++
 sys/arch/hpcmips/include/bus.h     |    4 +-
 2 files changed, 748 insertions(+), 1 deletions(-)

diffs (truncated from 767 to 300 lines):

diff -r 299ca07f1717 -r 182c8073c43f sys/arch/hpcmips/hpcmips/bus_dma.c
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/hpcmips/hpcmips/bus_dma.c        Sat Mar 25 15:04:32 2000 +0000
@@ -0,0 +1,745 @@
+/*     $NetBSD: bus_dma.c,v 1.1 2000/03/25 15:04:32 uch Exp $  */
+
+/*-
+ * Copyright (c) 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/systm.h>
+#include <sys/mbuf.h>
+
+#include <vm/vm.h>
+#include <vm/vm_kern.h>
+
+
+#define _HPCMIPS_BUS_DMA_PRIVATE
+#include <machine/bus.h>
+
+static int     _bus_dmamap_load_buffer __P((bus_dmamap_t,
+                   void *, bus_size_t, struct proc *, int, vaddr_t *,
+                   int *, int));
+
+paddr_t        kvtophys __P((vaddr_t));        /* XXX */
+
+/*
+ * The default DMA tag for all busses on the DECstation.
+ */
+struct hpcmips_bus_dma_tag hpcmips_default_bus_dma_tag = {
+       _bus_dmamap_create,
+       _bus_dmamap_destroy,
+       _bus_dmamap_load,
+       _bus_dmamap_load_mbuf,
+       _bus_dmamap_load_uio,
+       _bus_dmamap_load_raw,
+       _bus_dmamap_unload,
+       _bus_dmamap_sync,
+       _bus_dmamem_alloc,
+       _bus_dmamem_free,
+       _bus_dmamem_map,
+       _bus_dmamem_unmap,
+       _bus_dmamem_mmap,
+       NULL
+};
+
+/*
+ * 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 hpcmips_bus_dmamap *map;
+       void *mapstore;
+       size_t mapsize;
+
+       /*
+        * Allcoate 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 notifes 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 hpcmips_bus_dmamap) +
+           (sizeof(bus_dma_segment_t) * (nsegments - 1));
+       if ((mapstore = malloc(mapsize, M_DMAMAP,
+           (flags & BUS_DMA_NOWAIT) ? M_NOWAIT : M_WAITOK)) == NULL)
+               return (ENOMEM);
+
+       bzero(mapstore, mapsize);
+       map = (struct hpcmips_bus_dmamap *)mapstore;
+       map->_dm_size = size;
+       map->_dm_segcnt = nsegments;
+       map->_dm_maxsegsz = maxsegsz;
+       map->_dm_boundary = boundary;
+       map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT);
+       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_DMAMAP);
+}
+
+/*
+ * 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.
+ */
+static int
+_bus_dmamap_load_buffer(map, buf, buflen, p, flags,
+    lastaddrp, segp, first)
+       bus_dmamap_t map;
+       void *buf;
+       bus_size_t buflen;
+       struct proc *p;
+       int flags;
+       vaddr_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;
+
+       lastaddr = *lastaddrp;
+       bmask  = ~(map->_dm_boundary - 1);
+
+       for (seg = *segp; buflen > 0 ; ) {
+               /*
+                * Get the physical address for this segment.
+                */
+               if (p != NULL)
+                       (void) pmap_extract(p->p_vmspace->vm_map.pmap,
+                           vaddr, &curaddr);
+               else
+                       curaddr = kvtophys(vaddr);
+
+               /*
+                * Compute the segment size, and adjust counts.
+                */
+               sgsize = NBPG - ((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;
+                       map->dm_segs[seg]._ds_vaddr = vaddr;
+                       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;
+                               map->dm_segs[seg]._ds_vaddr = vaddr;
+                       }
+               }
+
+               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 direct-mapped DMA map with a linear
+ * buffer.
+ */
+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;
+{
+       vaddr_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(map, buf, buflen,
+           p, flags, &lastaddr, &seg, 1);
+       if (error == 0) {
+               map->dm_mapsize = buflen;
+               map->dm_nsegs = seg + 1;
+
+               /*
+                * For linear buffers, we support marking the mapping
+                * as COHERENT.
+                *
+                * XXX Check TLB entries for cache-inhibit bits?
+                */
+               if (buf >= (void *)MIPS_KSEG1_START &&
+                   buf < (void *)MIPS_KSEG2_START)
+                       map->_dm_flags |= HPCMIPS_DMAMAP_COHERENT;
+       }
+       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;
+{
+       vaddr_t lastaddr;
+       int seg, error, first;
+       struct mbuf *m;
+
+       /*
+        * Make sure that on error condition we return "no valid mappings."
+        */