bus_dma.h revision 1.1
1 /* $NetBSD: bus_dma.h,v 1.1 2002/04/10 04:36:20 briggs Exp $ */ 2 3 /* 4 * This file was extracted from from alpha/include/bus.h 5 * and should probably be resynced when needed. 6 * Darrin B. Jewell <dbj (at) netbsd.org> Sat Jul 31 06:11:33 UTC 1999 7 * original cvs id: NetBSD: bus.h,v 1.29 1999/06/18 04:49:24 cgd Exp 8 */ 9 10 11 /*- 12 * Copyright (c) 1997, 1998, 2001 The NetBSD Foundation, Inc. 13 * All rights reserved. 14 * 15 * This code is derived from software contributed to The NetBSD Foundation 16 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 17 * NASA Ames Research Center. 18 * 19 * Redistribution and use in source and binary forms, with or without 20 * modification, are permitted provided that the following conditions 21 * are met: 22 * 1. Redistributions of source code must retain the above copyright 23 * notice, this list of conditions and the following disclaimer. 24 * 2. Redistributions in binary form must reproduce the above copyright 25 * notice, this list of conditions and the following disclaimer in the 26 * documentation and/or other materials provided with the distribution. 27 * 3. All advertising materials mentioning features or use of this software 28 * must display the following acknowledgement: 29 * This product includes software developed by the NetBSD 30 * Foundation, Inc. and its contributors. 31 * 4. Neither the name of The NetBSD Foundation nor the names of its 32 * contributors may be used to endorse or promote products derived 33 * from this software without specific prior written permission. 34 * 35 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 36 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 37 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 38 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 39 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 40 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 41 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 42 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 43 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 44 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 45 * POSSIBILITY OF SUCH DAMAGE. 46 */ 47 48 /* 49 * Copyright (c) 1996 Carnegie-Mellon University. 50 * All rights reserved. 51 * 52 * Author: Chris G. Demetriou 53 * 54 * Permission to use, copy, modify and distribute this software and 55 * its documentation is hereby granted, provided that both the copyright 56 * notice and this permission notice appear in all copies of the 57 * software, derivative works or modified versions, and any portions 58 * thereof, and that both notices appear in supporting documentation. 59 * 60 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 61 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 62 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 63 * 64 * Carnegie Mellon requests users of this software to return to 65 * 66 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 67 * School of Computer Science 68 * Carnegie Mellon University 69 * Pittsburgh PA 15213-3890 70 * 71 * any improvements or extensions that they make and grant Carnegie the 72 * rights to redistribute these changes. 73 */ 74 75 #ifndef _M68K_BUS_DMA_H_ 76 #define _M68K_BUS_DMA_H_ 77 78 /* 79 * Bus DMA methods. 80 */ 81 82 /* 83 * Flags used in various bus DMA methods. 84 */ 85 #define BUS_DMA_WAITOK 0x000 /* safe to sleep (pseudo-flag) */ 86 #define BUS_DMA_NOWAIT 0x001 /* not safe to sleep */ 87 #define BUS_DMA_ALLOCNOW 0x002 /* perform resource allocation now */ 88 #define BUS_DMA_COHERENT 0x004 /* hint: map memory DMA coherent */ 89 #define BUS_DMA_STREAMING 0x008 /* hint: sequential, unidirectional */ 90 #define BUS_DMA_BUS1 0x010 /* placeholders for bus functions... */ 91 #define BUS_DMA_BUS2 0x020 92 #define BUS_DMA_BUS3 0x040 93 #define BUS_DMA_BUS4 0x080 94 #define BUS_DMA_READ 0x100 /* mapping is device -> memory only */ 95 #define BUS_DMA_WRITE 0x200 /* mapping is memory -> device only */ 96 97 /* Forwards needed by prototypes below. */ 98 struct mbuf; 99 struct uio; 100 101 /* 102 * Operations performed by bus_dmamap_sync(). 103 */ 104 #define BUS_DMASYNC_PREREAD 0x01 /* pre-read synchronization */ 105 #define BUS_DMASYNC_POSTREAD 0x02 /* post-read synchronization */ 106 #define BUS_DMASYNC_PREWRITE 0x04 /* pre-write synchronization */ 107 #define BUS_DMASYNC_POSTWRITE 0x08 /* post-write synchronization */ 108 109 typedef struct m68k_bus_dma_tag *bus_dma_tag_t; 110 typedef struct m68k_bus_dmamap *bus_dmamap_t; 111 112 /* 113 * bus_dma_segment_t 114 * 115 * Describes a single contiguous DMA transaction. Values 116 * are suitable for programming into DMA registers. 117 */ 118 struct m68k_bus_dma_segment { 119 bus_addr_t ds_addr; /* DMA address */ 120 bus_size_t ds_len; /* length of transfer */ 121 }; 122 typedef struct m68k_bus_dma_segment bus_dma_segment_t; 123 124 /* 125 * bus_dma_tag_t 126 * 127 * A machine-dependent opaque type describing the implementation of 128 * DMA for a given bus. 129 */ 130 struct m68k_bus_dma_tag { 131 void *_cookie; /* cookie used in the guts */ 132 133 /* 134 * Some chipsets have a built-in boundary constraint, independent 135 * of what the device requests. This allows that boundary to 136 * be specified. If the device has a more restrictive constraint, 137 * the map will use that, otherwise this boundary will be used. 138 * This value is ignored if 0. 139 */ 140 bus_size_t _boundary; 141 142 /* 143 * DMA mapping methods. 144 */ 145 int (*_dmamap_create) __P((bus_dma_tag_t, bus_size_t, int, 146 bus_size_t, bus_size_t, int, bus_dmamap_t *)); 147 void (*_dmamap_destroy) __P((bus_dma_tag_t, bus_dmamap_t)); 148 int (*_dmamap_load) __P((bus_dma_tag_t, bus_dmamap_t, void *, 149 bus_size_t, struct proc *, int)); 150 int (*_dmamap_load_mbuf) __P((bus_dma_tag_t, bus_dmamap_t, 151 struct mbuf *, int)); 152 int (*_dmamap_load_uio) __P((bus_dma_tag_t, bus_dmamap_t, 153 struct uio *, int)); 154 int (*_dmamap_load_raw) __P((bus_dma_tag_t, bus_dmamap_t, 155 bus_dma_segment_t *, int, bus_size_t, int)); 156 void (*_dmamap_unload) __P((bus_dma_tag_t, bus_dmamap_t)); 157 void (*_dmamap_sync) __P((bus_dma_tag_t, bus_dmamap_t, 158 bus_addr_t, bus_size_t, int)); 159 160 /* 161 * DMA memory utility functions. 162 */ 163 int (*_dmamem_alloc) __P((bus_dma_tag_t, bus_size_t, bus_size_t, 164 bus_size_t, bus_dma_segment_t *, int, int *, int)); 165 void (*_dmamem_free) __P((bus_dma_tag_t, 166 bus_dma_segment_t *, int)); 167 int (*_dmamem_map) __P((bus_dma_tag_t, bus_dma_segment_t *, 168 int, size_t, caddr_t *, int)); 169 void (*_dmamem_unmap) __P((bus_dma_tag_t, caddr_t, size_t)); 170 paddr_t (*_dmamem_mmap) __P((bus_dma_tag_t, bus_dma_segment_t *, 171 int, off_t, int, int)); 172 }; 173 174 #define bus_dmamap_create(t, s, n, m, b, f, p) \ 175 (*(t)->_dmamap_create)((t), (s), (n), (m), (b), (f), (p)) 176 #define bus_dmamap_destroy(t, p) \ 177 (*(t)->_dmamap_destroy)((t), (p)) 178 #define bus_dmamap_load(t, m, b, s, p, f) \ 179 (*(t)->_dmamap_load)((t), (m), (b), (s), (p), (f)) 180 #define bus_dmamap_load_mbuf(t, m, b, f) \ 181 (*(t)->_dmamap_load_mbuf)((t), (m), (b), (f)) 182 #define bus_dmamap_load_uio(t, m, u, f) \ 183 (*(t)->_dmamap_load_uio)((t), (m), (u), (f)) 184 #define bus_dmamap_load_raw(t, m, sg, n, s, f) \ 185 (*(t)->_dmamap_load_raw)((t), (m), (sg), (n), (s), (f)) 186 #define bus_dmamap_unload(t, p) \ 187 (*(t)->_dmamap_unload)((t), (p)) 188 #define bus_dmamap_sync(t, p, o, l, ops) \ 189 (*(t)->_dmamap_sync)((t), (p), (o), (l), (ops)) 190 #define bus_dmamem_alloc(t, s, a, b, sg, n, r, f) \ 191 (*(t)->_dmamem_alloc)((t), (s), (a), (b), (sg), (n), (r), (f)) 192 #define bus_dmamem_free(t, sg, n) \ 193 (*(t)->_dmamem_free)((t), (sg), (n)) 194 #define bus_dmamem_map(t, sg, n, s, k, f) \ 195 (*(t)->_dmamem_map)((t), (sg), (n), (s), (k), (f)) 196 #define bus_dmamem_unmap(t, k, s) \ 197 (*(t)->_dmamem_unmap)((t), (k), (s)) 198 #define bus_dmamem_mmap(t, sg, n, o, p, f) \ 199 (*(t)->_dmamem_mmap)((t), (sg), (n), (o), (p), (f)) 200 201 /* 202 * bus_dmamap_t 203 * 204 * Describes a DMA mapping. 205 */ 206 struct m68k_bus_dmamap { 207 /* 208 * PRIVATE MEMBERS: not for use by machine-independent code. 209 */ 210 bus_size_t _dm_size; /* largest DMA transfer mappable */ 211 int _dm_segcnt; /* number of segs this map can map */ 212 bus_size_t _dm_maxsegsz; /* largest possible segment */ 213 bus_size_t _dm_boundary; /* don't cross this */ 214 int _dm_flags; /* misc. flags */ 215 216 /* Machine dependant fields: */ 217 bus_size_t dm_xfer_len; /* length of successful transfer */ 218 219 /* 220 * PUBLIC MEMBERS: these are used by machine-independent code. 221 */ 222 bus_size_t dm_mapsize; /* size of the mapping */ 223 int dm_nsegs; /* # valid segments in mapping */ 224 bus_dma_segment_t dm_segs[1]; /* segments; variable length */ 225 226 }; 227 228 #ifdef _M68K_BUS_DMA_PRIVATE 229 int _bus_dmamap_create __P((bus_dma_tag_t, bus_size_t, int, bus_size_t, 230 bus_size_t, int, bus_dmamap_t *)); 231 void _bus_dmamap_destroy __P((bus_dma_tag_t, bus_dmamap_t)); 232 233 int _bus_dmamap_load_direct __P((bus_dma_tag_t, bus_dmamap_t, 234 void *, bus_size_t, struct proc *, int)); 235 int _bus_dmamap_load_mbuf_direct __P((bus_dma_tag_t, 236 bus_dmamap_t, struct mbuf *, int)); 237 int _bus_dmamap_load_uio_direct __P((bus_dma_tag_t, 238 bus_dmamap_t, struct uio *, int)); 239 int _bus_dmamap_load_raw_direct __P((bus_dma_tag_t, 240 bus_dmamap_t, bus_dma_segment_t *, int, bus_size_t, int)); 241 242 void _bus_dmamap_unload __P((bus_dma_tag_t, bus_dmamap_t)); 243 void _bus_dmamap_sync __P((bus_dma_tag_t, bus_dmamap_t, bus_addr_t, 244 bus_size_t, int)); 245 246 int _bus_dmamem_alloc __P((bus_dma_tag_t tag, bus_size_t size, 247 bus_size_t alignment, bus_size_t boundary, 248 bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags)); 249 void _bus_dmamem_free __P((bus_dma_tag_t tag, bus_dma_segment_t *segs, 250 int nsegs)); 251 int _bus_dmamem_map __P((bus_dma_tag_t tag, bus_dma_segment_t *segs, 252 int nsegs, size_t size, caddr_t *kvap, int flags)); 253 void _bus_dmamem_unmap __P((bus_dma_tag_t tag, caddr_t kva, 254 size_t size)); 255 paddr_t _bus_dmamem_mmap __P((bus_dma_tag_t tag, bus_dma_segment_t *segs, 256 int nsegs, off_t off, int prot, int flags)); 257 #endif /* _M68K_BUS_DMA_PRIVATE */ 258 259 #endif /* _M68K_BUS_DMA_H_ */ 260
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