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      1 /*	$NetBSD: fwdma.h,v 1.6 2010/03/29 03:05:27 kiyohara Exp $	*/
      2 /*-
      3  * Copyright (C) 2003
      4  * 	Hidetoshi Shimokawa. All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *
     17  *	This product includes software developed by Hidetoshi Shimokawa.
     18  *
     19  * 4. Neither the name of the author nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  * $FreeBSD: /repoman/r/ncvs/src/sys/dev/firewire/fwdma.h,v 1.3 2005/01/06 01:42:41 imp Exp $
     36  */
     37 
     38 #ifndef _FWDMA_H_
     39 #define _FWDMA_H_
     40 
     41 struct fwdma_alloc {
     42 	bus_dma_tag_t	dma_tag;
     43 	bus_dmamap_t	dma_map;
     44 	void *		v_addr;
     45 	bus_addr_t	bus_addr;
     46 };
     47 
     48 struct fwdma_seg {
     49 	bus_dmamap_t	dma_map;
     50 	void *		v_addr;
     51 	bus_addr_t	bus_addr;
     52 };
     53 
     54 struct fwdma_alloc_multi {
     55 	bus_size_t	ssize;
     56 	bus_size_t	esize;
     57 	int		nseg;
     58 	bus_dma_tag_t	dma_tag;
     59 	struct fwdma_seg seg[0];
     60 };
     61 
     62 static __inline void *
     63 fwdma_v_addr(struct fwdma_alloc_multi *am, int index)
     64 {
     65 	bus_size_t ssize = am->ssize;
     66 	int offset = am->esize * index;
     67 
     68 	return (char *)am->seg[offset / ssize].v_addr + (offset % ssize);
     69 }
     70 
     71 static __inline bus_addr_t
     72 fwdma_bus_addr(struct fwdma_alloc_multi *am, int index)
     73 {
     74 	bus_size_t ssize = am->ssize;
     75 	int offset = am->esize * index;
     76 
     77 	return am->seg[offset / ssize].bus_addr + (offset % ssize);
     78 }
     79 
     80 static __inline void
     81 fwdma_sync_multiseg(struct fwdma_alloc_multi *am, int start, int end, int op)
     82 {
     83 	struct fwdma_seg *seg, *eseg;
     84 	bus_addr_t off, eoff;
     85 
     86 	off = (am->esize * start) % am->ssize;
     87 	eoff = (am->esize * end) % am->ssize;
     88 	seg = &am->seg[am->esize * start / am->ssize];
     89 	eseg = &am->seg[am->esize * end / am->ssize];
     90 
     91 	if (start > end) {
     92 		for (; seg < &am->seg[am->nseg]; seg++) {
     93 			bus_dmamap_sync(am->dma_tag, seg->dma_map,
     94 			    off, seg->dma_map->dm_mapsize - off, op);
     95 			off = 0;
     96 		}
     97 		seg = am->seg;
     98 	}
     99 	for (; seg < eseg; seg++) {
    100 		bus_dmamap_sync(am->dma_tag, seg->dma_map,
    101 		    off, seg->dma_map->dm_mapsize - off, op);
    102 		off = 0;
    103 	}
    104 	bus_dmamap_sync(am->dma_tag, seg->dma_map,
    105 	    off, eoff - off + am->esize, op);
    106 }
    107 
    108 static __inline void
    109 fwdma_sync_multiseg_all(struct fwdma_alloc_multi *am, int op)
    110 {
    111 	struct fwdma_seg *seg;
    112 	int i;
    113 
    114 	seg = am->seg;
    115 	for (i = 0; i < am->nseg; i++, seg++)
    116 		bus_dmamap_sync(am->dma_tag, seg->dma_map,
    117 		    0, seg->dma_map->dm_mapsize, op);
    118 }
    119 
    120 void *fwdma_malloc(device_t, bus_dma_tag_t, bus_dmamap_t *, bus_size_t, int,
    121 		   int);
    122 void fwdma_free(bus_dma_tag_t, bus_dmamap_t, void *);
    123 void *fwdma_alloc_setup(device_t, bus_dma_tag_t, bus_size_t,
    124 			struct fwdma_alloc *, int, int);
    125 struct fwdma_alloc_multi *fwdma_malloc_multiseg(struct firewire_comm *,
    126 						int, int, int, int);
    127 void fwdma_free_multiseg(struct fwdma_alloc_multi *);
    128 
    129 #endif	/* _FWDMA_H_ */
    130