sys/bus/firewire/fwdma.h

   1 /*
   2  * Copyright (C) 2003
   3  *      Hidetoshi Shimokawa. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *
  16  *      This product includes software developed by Hidetoshi Shimokawa.
  17  *
  18  * 4. Neither the name of the author nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $FreeBSD: src/sys/dev/firewire/fwdma.h,v 1.2 2003/05/27 16:34:52 scottl Exp $
  35  * $DragonFly: src/sys/bus/firewire/fwdma.h,v 1.3 2004/02/05 13:32:08 joerg Exp $
  36  */
  37
  38 struct fwdma_alloc {
  39         bus_dma_tag_t   dma_tag;
  40         bus_dmamap_t    dma_map;
  41         void *          v_addr;
  42         bus_addr_t      bus_addr;
  43 };
  44
  45 struct fwdma_seg {
  46         bus_dmamap_t    dma_map;
  47         void *          v_addr;
  48         bus_addr_t      bus_addr;
  49 };
  50
  51 struct fwdma_alloc_multi {
  52         bus_size_t      ssize;
  53         bus_size_t      esize;
  54         int             nseg;
  55         bus_dma_tag_t   dma_tag;
  56         struct fwdma_seg seg[0];
  57 };
  58
  59 static __inline void *
  60 fwdma_v_addr(struct fwdma_alloc_multi *am, int index)
  61 {
  62         bus_size_t ssize = am->ssize;
  63         int offset = am->esize * index;
  64
  65         return ((caddr_t)am->seg[offset / ssize].v_addr + (offset % ssize));
  66 }
  67
  68 static __inline bus_addr_t
  69 fwdma_bus_addr(struct fwdma_alloc_multi *am, int index)
  70 {
  71         bus_size_t ssize = am->ssize;
  72         int offset = am->esize * index;
  73
  74         return (am->seg[offset / ssize].bus_addr + (offset % ssize));
  75 }
  76
  77 static __inline void
  78 fwdma_sync(struct fwdma_alloc *dma, bus_dmasync_op_t op)
  79 {
  80         bus_dmamap_sync(dma->dma_tag, dma->dma_map, op);
  81 }
  82
  83 static __inline void
  84 fwdma_sync_multiseg(struct fwdma_alloc_multi *am,
  85                         int start, int end, bus_dmasync_op_t op)
  86 {
  87         struct fwdma_seg *seg, *eseg;
  88
  89         seg = &am->seg[am->esize * start / am->ssize];
  90         eseg = &am->seg[am->esize * end / am->ssize];
  91         for (; seg <= eseg; seg ++)
  92                 bus_dmamap_sync(am->dma_tag, seg->dma_map, op);
  93 }
  94
  95 static __inline void
  96 fwdma_sync_multiseg_all(struct fwdma_alloc_multi *am, bus_dmasync_op_t op)
  97 {
  98         struct fwdma_seg *seg;
  99         int i;
 100
 101         seg = &am->seg[0];
 102         for (i = 0; i < am->nseg; i++, seg++)
 103                 bus_dmamap_sync(am->dma_tag, seg->dma_map, op);
 104 }
 105
 106 void *fwdma_malloc(struct firewire_comm *, int, bus_size_t, struct fwdma_alloc *, int);
 107 void fwdma_free(struct firewire_comm *, struct fwdma_alloc *);
 108 void *fwdma_malloc_size(bus_dma_tag_t, bus_dmamap_t *, bus_size_t, bus_addr_t *, int);
 109 void fwdma_free_size(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t);
 110 struct fwdma_alloc_multi *fwdma_malloc_multiseg(struct firewire_comm *,
 111         int, int, int, int);
 112 void fwdma_free_multiseg(struct fwdma_alloc_multi *);
 113