FreeBSD/Linux Kernel Cross Reference
sys/dev/firewire/fwdma.h

     /*-
      * Copyright (C) 2003
      *      Hidetoshi Shimokawa. 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *
     *      This product includes software developed by Hidetoshi Shimokawa.
     *
     * 4. Neither the name of the author 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 REGENTS 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 REGENTS 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: releng/8.4/sys/dev/firewire/fwdma.h 139749 2005-01-06 01:43:34Z imp $
     */
    
    struct fwdma_alloc {
            bus_dma_tag_t   dma_tag;
            bus_dmamap_t    dma_map;
            void *          v_addr;
            bus_addr_t      bus_addr;
    };
    
    struct fwdma_seg {
            bus_dmamap_t    dma_map;
            void *          v_addr;
            bus_addr_t      bus_addr;
    };
    
    struct fwdma_alloc_multi {
            bus_size_t      ssize;
            bus_size_t      esize;
            int             nseg;
            bus_dma_tag_t   dma_tag;
            struct fwdma_seg seg[0];
    };
    
    static __inline void *
    fwdma_v_addr(struct fwdma_alloc_multi *am, int index)
    {
            bus_size_t ssize = am->ssize;
            int offset = am->esize * index;
    
            return ((caddr_t)am->seg[offset / ssize].v_addr + (offset % ssize));
    }
    
    static __inline bus_addr_t
    fwdma_bus_addr(struct fwdma_alloc_multi *am, int index)
    {
            bus_size_t ssize = am->ssize;
            int offset = am->esize * index;
    
            return (am->seg[offset / ssize].bus_addr + (offset % ssize));
    }
    
    static __inline void
    fwdma_sync(struct fwdma_alloc *dma, bus_dmasync_op_t op)  
    {
            bus_dmamap_sync(dma->dma_tag, dma->dma_map, op);
    }
    
    static __inline void
    fwdma_sync_multiseg(struct fwdma_alloc_multi *am,
                            int start, int end, bus_dmasync_op_t op)
    {
            struct fwdma_seg *seg, *eseg;
    
            seg = &am->seg[am->esize * start / am->ssize];
            eseg = &am->seg[am->esize * end / am->ssize];
            for (; seg <= eseg; seg ++)
                    bus_dmamap_sync(am->dma_tag, seg->dma_map, op);
    }
    
    static __inline void
    fwdma_sync_multiseg_all(struct fwdma_alloc_multi *am, bus_dmasync_op_t op)
    {
            struct fwdma_seg *seg;
            int i;
    
           seg = &am->seg[0];
           for (i = 0; i < am->nseg; i++, seg++)
                   bus_dmamap_sync(am->dma_tag, seg->dma_map, op);
   }
   
   void *fwdma_malloc(struct firewire_comm *, int, bus_size_t, struct fwdma_alloc *, int);
   void fwdma_free(struct firewire_comm *, struct fwdma_alloc *);
   void *fwdma_malloc_size(bus_dma_tag_t, bus_dmamap_t *, bus_size_t, bus_addr_t *, int);
   void fwdma_free_size(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t);
   struct fwdma_alloc_multi *fwdma_malloc_multiseg(struct firewire_comm *,
           int, int, int, int);
   void fwdma_free_multiseg(struct fwdma_alloc_multi *);
   

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