/*      $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_ */