1 /*- 2 * Copyright 2006 John-Mark Gurney. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/sys/sys/_bus_dma.h,v 1.1 2006/09/03 00:26:17 jmg Exp $ 27 * 28 */ 29 #ifndef _SYS__BUS_DMA_H_ 30 #define _SYS__BUS_DMA_H_ 31 32 typedef int bus_dmasync_op_t; 33 34 /* 35 * bus_dma_tag_t 36 * 37 * A machine-dependent opaque type describing the characteristics 38 * of how to perform DMA mappings. This structure encapsultes 39 * information concerning address and alignment restrictions, number 40 * of S/G segments, amount of data per S/G segment, etc. 41 */ 42 typedef struct bus_dma_tag *bus_dma_tag_t; 43 44 /* 45 * bus_dmamap_t 46 * 47 * DMA mapping instance information. 48 */ 49 typedef struct bus_dmamap *bus_dmamap_t; 50 51 /* 52 * A function that performs driver-specific synchronization on behalf of 53 * busdma. 54 */ 55 typedef enum { 56 BUS_DMA_LOCK = 0x01, 57 BUS_DMA_UNLOCK = 0x02, 58 } bus_dma_lock_op_t; 59 60 typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t); 61 62 #endif /* !_SYS__BUS_DMA_H_ */ 63