84ee477ac3
typedef for bus_dma_tag_t in sys/bus.h w/o poluting the namespace... This is in preperation for adding bus_get_dma_tag to sys/bus.h...
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/*-
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* Copyright 2006 John-Mark Gurney.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef _SYS__BUS_DMA_H_
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#define _SYS__BUS_DMA_H_
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typedef int bus_dmasync_op_t;
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/*
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* bus_dma_tag_t
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*
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* A machine-dependent opaque type describing the characteristics
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* of how to perform DMA mappings. This structure encapsultes
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* information concerning address and alignment restrictions, number
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* of S/G segments, amount of data per S/G segment, etc.
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*/
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typedef struct bus_dma_tag *bus_dma_tag_t;
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/*
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* bus_dmamap_t
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*
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* DMA mapping instance information.
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*/
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typedef struct bus_dmamap *bus_dmamap_t;
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/*
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* A function that performs driver-specific synchronization on behalf of
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* busdma.
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*/
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typedef enum {
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BUS_DMA_LOCK = 0x01,
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BUS_DMA_UNLOCK = 0x02,
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} bus_dma_lock_op_t;
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typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
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#endif /* !_SYS__BUS_DMA_H_ */
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