1 /* $NetBSD: bus_defs.h,v 1.2 2011/08/25 15:06:10 dyoung Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998, 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1996 Charles M. Hannum. All rights reserved. 35 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by Christopher G. Demetriou 48 * for the NetBSD Project. 49 * 4. The name of the author may not be used to endorse or promote products 50 * derived from this software without specific prior written permission 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 53 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 54 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 55 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 56 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 57 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 58 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 59 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 60 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 61 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 62 */ 63 64 #ifndef _X86_BUS_H_ 65 #define _X86_BUS_H_ 66 67 #include <x86/busdefs.h> 68 69 #ifdef BUS_SPACE_DEBUG 70 #define BUS_SPACE_ALIGNED_ADDRESS(p, t) \ 71 ((((u_long)(p)) & (sizeof(t)-1)) == 0) 72 #define BUS_SPACE_ALIGNED_POINTER(p, t) BUS_SPACE_ALIGNED_ADDRESS(p, t) 73 #else 74 #define BUS_SPACE_ALIGNED_POINTER(p, t) ALIGNED_POINTER(p, t) 75 #endif /* BUS_SPACE_DEBUG */ 76 77 /* 78 * Bus address and size types 79 */ 80 typedef paddr_t bus_addr_t; 81 typedef size_t bus_size_t; 82 83 struct bus_space_tag; 84 typedef struct bus_space_tag *bus_space_tag_t; 85 86 struct bus_space_tag { 87 int bst_type; 88 bus_space_tag_t bst_super; 89 /* bst_present: bitmap indicating overrides present (1) in *this* tag, 90 * bst_exists: bitmap indicating overrides present (1) in *this* tag 91 * or in an ancestor's tag (follow bst_super to ancestors) 92 */ 93 uint64_t bst_present; 94 uint64_t bst_exists; 95 const struct bus_space_overrides *bst_ov; 96 void *bst_ctx; 97 }; 98 99 typedef vaddr_t bus_space_handle_t; 100 101 typedef struct x86_bus_dma_tag *bus_dma_tag_t; 102 typedef struct x86_bus_dmamap *bus_dmamap_t; 103 104 #define BUS_DMA_TAG_VALID(__t) ((__t) != NULL) 105 106 /* 107 * bus_dma_segment_t 108 * 109 * Describes a single contiguous DMA transaction. Values 110 * are suitable for programming into DMA registers. 111 */ 112 typedef struct x86_bus_dma_segment { 113 bus_addr_t ds_addr; /* DMA address */ 114 bus_size_t ds_len; /* length of transfer */ 115 } bus_dma_segment_t; 116 117 /* 118 * bus_dmamap_t 119 * 120 * Describes a DMA mapping. XXX exposing structure to LKM. 121 */ 122 struct x86_bus_dmamap { 123 /* 124 * PRIVATE MEMBERS: not for use by machine-independent code. 125 */ 126 bus_size_t _dm_size; /* largest DMA transfer mappable */ 127 int _dm_segcnt; /* number of segs this map can map */ 128 bus_size_t _dm_maxmaxsegsz; /* fixed largest possible segment */ 129 bus_size_t _dm_boundary; /* don't cross this */ 130 bus_addr_t _dm_bounce_thresh; /* bounce threshold; see tag */ 131 int _dm_flags; /* misc. flags */ 132 133 void *_dm_cookie; /* cookie for bus-specific functions */ 134 135 /* 136 * PUBLIC MEMBERS: these are used by machine-independent code. 137 */ 138 bus_size_t dm_maxsegsz; /* largest possible segment */ 139 bus_size_t dm_mapsize; /* size of the mapping */ 140 int dm_nsegs; /* # valid segments in mapping */ 141 bus_dma_segment_t dm_segs[1]; /* segments; variable length */ 142 }; 143 144 #endif /* _X86_BUS_H_ */ 145