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