1/* $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ */ 2 3/*- 4 * Copyright (c) 1996, 1997 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40/*- 41 * Copyright (c) 1996 Charles M. Hannum. All rights reserved. 42 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by Christopher G. Demetriou 55 * for the NetBSD Project. 56 * 4. The name of the author may not be used to endorse or promote products 57 * derived from this software without specific prior written permission 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 60 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 61 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 62 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 63 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 64 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 65 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 66 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 67 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 68 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 69 */ 70/* $FreeBSD: src/sys/sys/bus_dma.h,v 1.30 2006/09/03 00:26:17 jmg Exp $ */ 71#ifndef _BUS_DMA_H_ 72#define _BUS_DMA_H_ 73 74#include <sys/_bus_dma.h> 75 76 77/* 78 * Machine independent interface for mapping physical addresses to peripheral 79 * bus 'physical' addresses, and assisting with DMA operations. 80 * 81 * XXX This file is always included from <machine/bus_dma.h> and should not 82 * (yet) be included directly. 83 */ 84 85/* 86 * Flags used in various bus DMA methods. 87 */ 88#define BUS_DMA_WAITOK 0x00 /* safe to sleep (pseudo-flag) */ 89#define BUS_DMA_NOWAIT 0x01 /* not safe to sleep */ 90#define BUS_DMA_ALLOCNOW 0x02 /* perform resource allocation now */ 91#define BUS_DMA_COHERENT 0x04 /* hint: map memory in a coherent way */ 92#define BUS_DMA_ZERO 0x08 /* allocate zero'ed memory */ 93#define BUS_DMA_BUS1 0x10 /* placeholders for bus functions... */ 94#define BUS_DMA_BUS2 0x20 95#define BUS_DMA_BUS3 0x40 96#define BUS_DMA_BUS4 0x80 97 98/* 99 * The following two flags are non-standard or specific to only certain 100 * architectures 101 */ 102#define BUS_DMA_NOWRITE 0x100 103#ifndef __HAIKU__ 104#define BUS_DMA_NOCACHE 0x200 105#endif 106 107/* Forwards needed by prototypes below. */ 108struct mbuf; 109struct uio; 110 111/* 112 * Operations performed by bus_dmamap_sync(). 113 */ 114#define BUS_DMASYNC_PREREAD 1 115#define BUS_DMASYNC_POSTREAD 2 116#define BUS_DMASYNC_PREWRITE 4 117#define BUS_DMASYNC_POSTWRITE 8 118 119/* 120 * bus_dma_segment_t 121 * 122 * Describes a single contiguous DMA transaction. Values 123 * are suitable for programming into DMA registers. 124 */ 125typedef struct bus_dma_segment { 126 bus_addr_t ds_addr; /* DMA address */ 127 bus_size_t ds_len; /* length of transfer */ 128} bus_dma_segment_t; 129 130/* 131 * A function that returns 1 if the address cannot be accessed by 132 * a device and 0 if it can be. 133 */ 134typedef int bus_dma_filter_t(void *, bus_addr_t); 135 136/* 137 * Generic helper function for manipulating mutexes. 138 */ 139void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op); 140 141/* 142 * Allocate a device specific dma_tag encapsulating the constraints of 143 * the parent tag in addition to other restrictions specified: 144 * 145 * alignment: Alignment for segments. 146 * boundary: Boundary that segments cannot cross. 147 * lowaddr: Low restricted address that cannot appear in a mapping. 148 * highaddr: High restricted address that cannot appear in a mapping. 149 * filtfunc: An optional function to further test if an address 150 * within the range of lowaddr and highaddr cannot appear 151 * in a mapping. 152 * filtfuncarg: An argument that will be passed to filtfunc in addition 153 * to the address to test. 154 * maxsize: Maximum mapping size supported by this tag. 155 * nsegments: Number of discontinuities allowed in maps. 156 * maxsegsz: Maximum size of a segment in the map. 157 * flags: Bus DMA flags. 158 * lockfunc: An optional function to handle driver-defined lock 159 * operations. 160 * lockfuncarg: An argument that will be passed to lockfunc in addition 161 * to the lock operation. 162 * dmat: A pointer to set to a valid dma tag should the return 163 * value of this function indicate success. 164 */ 165/* XXX Should probably allow specification of alignment */ 166int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 167 bus_addr_t boundary, bus_addr_t lowaddr, 168 bus_addr_t highaddr, bus_dma_filter_t *filtfunc, 169 void *filtfuncarg, bus_size_t maxsize, int nsegments, 170 bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 171 void *lockfuncarg, bus_dma_tag_t *dmat); 172 173int bus_dma_tag_destroy(bus_dma_tag_t dmat); 174 175/* 176 * A function that processes a successfully loaded dma map or an error 177 * from a delayed load map. 178 */ 179typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int); 180 181/* 182 * Like bus_dmamap_callback but includes map size in bytes. This is 183 * defined as a separate interface to maintain compatibility for users 184 * of bus_dmamap_callback_t--at some point these interfaces should be merged. 185 */ 186typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int); 187 188/* 189 * Allocate a handle for mapping from kva/uva/physical 190 * address space into bus device space. 191 */ 192int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp); 193 194/* 195 * Destroy a handle for mapping from kva/uva/physical 196 * address space into bus device space. 197 */ 198int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map); 199 200/* 201 * Allocate a piece of memory that can be efficiently mapped into 202 * bus device space based on the constraints listed in the dma tag. 203 * A dmamap to for use with dmamap_load is also allocated. 204 */ 205int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 206 bus_dmamap_t *mapp); 207 208/* 209 * Free a piece of memory and its allocated dmamap, that was allocated 210 * via bus_dmamem_alloc. 211 */ 212void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map); 213 214/* Haiku extension, OpenBSD compatibility */ 215void bus_dmamem_free_tagless(void *vaddr, size_t size); 216 217/* 218 * Map the buffer buf into bus space using the dmamap map. 219 */ 220int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 221 bus_size_t buflen, bus_dmamap_callback_t *callback, 222 void *callback_arg, int flags); 223 224/* 225 * Like bus_dmamap_load but for mbufs. Note the use of the 226 * bus_dmamap_callback2_t interface. 227 */ 228int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, 229 struct mbuf *mbuf, 230 bus_dmamap_callback2_t *callback, void *callback_arg, 231 int flags); 232 233int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 234 struct mbuf *mbuf, bus_dma_segment_t *segs, 235 int *nsegs, int flags); 236 237/* 238 * Like bus_dmamap_load but for uios. Note the use of the 239 * bus_dmamap_callback2_t interface. 240 */ 241int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, 242 struct uio *ui, 243 bus_dmamap_callback2_t *callback, void *callback_arg, 244 int flags); 245 246/* 247 * Perform a synchronization operation on the given map. If the map 248 * is NULL we have a fully IO-coherent system. 249 */ 250void bus_dmamap_sync(bus_dma_tag_t dmat, bus_dmamap_t dmamap, bus_dmasync_op_t op); 251 252/* Haiku extension, OpenBSD compatibility */ 253void bus_dmamap_sync_etc(bus_dma_tag_t dmat, bus_dmamap_t dmamap, 254 bus_addr_t offset, bus_size_t length, bus_dmasync_op_t op); 255 256/* 257 * Release the mapping held by map. 258 */ 259void bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t dmamap); 260 261 262#endif /* _BUS_DMA_H_ */ 263