FreeBSD/Linux Kernel Cross Reference
sys/dev/ieee1394/fwdma.h

     /*      $NetBSD: fwdma.h,v 1.6 2010/03/29 03:05:27 kiyohara Exp $       */
     /*-
      * 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: /repoman/r/ncvs/src/sys/dev/firewire/fwdma.h,v 1.3 2005/01/06 01:42:41 imp Exp $
     */
    
    #ifndef _FWDMA_H_
    #define _FWDMA_H_
    
    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 (char *)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_multiseg(struct fwdma_alloc_multi *am, int start, int end, int op)
    {
            struct fwdma_seg *seg, *eseg;
            bus_addr_t off, eoff;
    
            off = (am->esize * start) % am->ssize;
            eoff = (am->esize * end) % am->ssize;
            seg = &am->seg[am->esize * start / am->ssize];
            eseg = &am->seg[am->esize * end / am->ssize];
    
            if (start > end) {
                    for (; seg < &am->seg[am->nseg]; seg++) {
                            bus_dmamap_sync(am->dma_tag, seg->dma_map,
                                off, seg->dma_map->dm_mapsize - off, op);
                            off = 0;
                    }
                    seg = am->seg;
            }
            for (; seg < eseg; seg++) {
                   bus_dmamap_sync(am->dma_tag, seg->dma_map,
                       off, seg->dma_map->dm_mapsize - off, op);
                   off = 0;
           }
           bus_dmamap_sync(am->dma_tag, seg->dma_map,
               off, eoff - off + am->esize, op);
   }
   
   static __inline void
   fwdma_sync_multiseg_all(struct fwdma_alloc_multi *am, int op)
   {
           struct fwdma_seg *seg;
           int i;
   
           seg = am->seg;
           for (i = 0; i < am->nseg; i++, seg++)
                   bus_dmamap_sync(am->dma_tag, seg->dma_map,
                       0, seg->dma_map->dm_mapsize, op);
   }
   
   void *fwdma_malloc(device_t, bus_dma_tag_t, bus_dmamap_t *, bus_size_t, int,
                      int);
   void fwdma_free(bus_dma_tag_t, bus_dmamap_t, void *);
   void *fwdma_alloc_setup(device_t, bus_dma_tag_t, bus_size_t,
                           struct fwdma_alloc *, int, int);
   struct fwdma_alloc_multi *fwdma_malloc_multiseg(struct firewire_comm *,
                                                   int, int, int, int);
   void fwdma_free_multiseg(struct fwdma_alloc_multi *);
   
   #endif  /* _FWDMA_H_ */

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