1 /*- 2 * Copyright (c) 1996, 1997 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 7 * NASA Ames Research Center. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 /* 38 * Copyright (c) 1996 Charles M. Hannum. All rights reserved. 39 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * This product includes software developed by Christopher G. Demetriou 52 * for the NetBSD Project. 53 * 4. The name of the author may not be used to endorse or promote products 54 * derived from this software without specific prior written permission 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 57 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 58 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 59 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 60 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 61 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 62 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 63 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 64 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 65 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 66 */ 67 /* 68 * $NetBSD: bus.h,v 1.12 1997/10/01 08:25:15 fvdl Exp $ 69 * $FreeBSD: src/sys/i386/include/bus_dma.h,v 1.15.2.2 2002/11/21 23:36:01 sam Exp $ 70 * $DragonFly: src/sys/sys/bus_dma.h,v 1.1 2006/10/25 20:56:03 dillon Exp $ 71 */ 72 73 #ifndef _SYS_BUS_DMA_H_ 74 #define _SYS_BUS_DMA_H_ 75 76 /* 77 * Include machine-specific bus stuff 78 */ 79 #ifndef _MACHINE_BUS_DMA_H_ 80 #include <machine/bus_dma.h> /* bus_addr_t */ 81 #endif 82 83 /* 84 * Flags used in various bus DMA methods. 85 */ 86 #define BUS_DMA_WAITOK 0x0000 /* safe to sleep (pseudo-flag) */ 87 #define BUS_DMA_NOWAIT 0x0001 /* not safe to sleep */ 88 #define BUS_DMA_ALLOCNOW 0x0002 /* perform resource allocation now */ 89 #define BUS_DMA_COHERENT 0x0004 /* map memory to not require sync */ 90 #define BUS_DMA_ZERO 0x0008 /* allocate zero'ed memory */ 91 #define BUS_DMA_BUS1 0x0010 /* placeholders for bus functions... */ 92 #define BUS_DMA_BUS2 0x0020 93 #define BUS_DMA_BUS3 0x0040 94 #define BUS_DMA_BUS4 0x0080 95 #define BUS_DMA_ONEBPAGE 0x0100 /* allocate one bpage per map at most */ 96 #define BUS_DMA_ALIGNED 0x0200 /* no bpage should be allocated due to 97 * alignment requirement; all to-be- 98 * loaded memory is properly aligned */ 99 100 /* Forwards needed by prototypes below. */ 101 struct mbuf; 102 struct uio; 103 104 /* 105 * bus_dmasync_op_t 106 * 107 * Operations performed by bus_dmamap_sync(). 108 */ 109 typedef enum { 110 BUS_DMASYNC_PREREAD, 111 BUS_DMASYNC_POSTREAD, 112 BUS_DMASYNC_PREWRITE, 113 BUS_DMASYNC_POSTWRITE 114 } bus_dmasync_op_t; 115 116 /* 117 * bus_dma_tag_t 118 * 119 * A machine-dependent opaque type describing the characteristics 120 * of how to perform DMA mappings. This structure encapsultes 121 * information concerning address and alignment restrictions, number 122 * of S/G segments, amount of data per S/G segment, etc. 123 */ 124 typedef struct bus_dma_tag *bus_dma_tag_t; 125 126 /* 127 * bus_dmamap_t 128 * 129 * DMA mapping instance information. 130 */ 131 typedef struct bus_dmamap *bus_dmamap_t; 132 133 /* 134 * bus_dma_segment_t 135 * 136 * Describes a single contiguous DMA transaction. Values 137 * are suitable for programming into DMA registers. 138 */ 139 typedef struct bus_dma_segment { 140 bus_addr_t ds_addr; /* DMA address */ 141 bus_size_t ds_len; /* length of transfer */ 142 } bus_dma_segment_t; 143 144 typedef struct bus_dmamem { 145 bus_dma_tag_t dmem_tag; 146 bus_dmamap_t dmem_map; 147 void *dmem_addr; 148 bus_addr_t dmem_busaddr; 149 } bus_dmamem_t; 150 151 /* 152 * A function that returns 1 if the address cannot be accessed by 153 * a device and 0 if it can be. 154 */ 155 typedef int bus_dma_filter_t(void *, bus_addr_t); 156 157 /* 158 * Allocate a device specific dma_tag encapsulating the constraints of 159 * the parent tag in addition to other restrictions specified: 160 * 161 * alignment: alignment for segments. 162 * boundary: Boundary that segments cannot cross. 163 * lowaddr: Low restricted address that cannot appear in a mapping. 164 * highaddr: High restricted address that cannot appear in a mapping. 165 * filtfunc: An optional function to further test if an address 166 * within the range of lowaddr and highaddr cannot appear 167 * in a mapping. 168 * filtfuncarg: An argument that will be passed to filtfunc in addition 169 * to the address to test. 170 * maxsize: Maximum mapping size supported by this tag. 171 * nsegments: Number of discontinuities allowed in maps. 172 * maxsegsz: Maximum size of a segment in the map. 173 * flags: Bus DMA flags. 174 * dmat: A pointer to set to a valid dma tag should the return 175 * value of this function indicate success. 176 */ 177 /* XXX Should probably allow specification of alignment */ 178 int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 179 bus_size_t boundary, bus_addr_t lowaddr, 180 bus_addr_t highaddr, bus_dma_filter_t *filtfunc, 181 void *filtfuncarg, bus_size_t maxsize, int nsegments, 182 bus_size_t maxsegsz, int flags, bus_dma_tag_t *dmat); 183 184 int bus_dma_tag_destroy(bus_dma_tag_t dmat); 185 bus_size_t bus_dma_tag_getmaxsize(bus_dma_tag_t tag); 186 187 /* 188 * Allocate a handle for mapping from kva/uva/physical 189 * address space into bus device space. 190 */ 191 int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp); 192 193 /* 194 * Destroy a handle for mapping from kva/uva/physical 195 * address space into bus device space. 196 */ 197 int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map); 198 199 /* 200 * Allocate a piece of memory that can be efficiently mapped into 201 * bus device space based on the constraints lited in the dma tag. 202 * A dmamap to for use with dmamap_load is also allocated. 203 */ 204 int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 205 bus_dmamap_t *mapp); 206 207 /* 208 * Free a piece of memory and it's allociated dmamap, that was allocated 209 * via bus_dmamem_alloc. 210 */ 211 void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map); 212 213 /* 214 * A function that processes a successfully loaded dma map or an error 215 * from a delayed load map. 216 */ 217 typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int); 218 219 /* 220 * Map the buffer buf into bus space using the dmamap map. 221 */ 222 int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 223 bus_size_t buflen, bus_dmamap_callback_t *callback, 224 void *callback_arg, int flags); 225 226 /* 227 * Like bus_dmamap_callback but includes map size in bytes. This is 228 * defined as a separate interface to maintain compatiiblity for users 229 * of bus_dmamap_callback_t--at some point these interfaces should be merged. 230 */ 231 typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int); 232 /* 233 * Like bus_dmamap_load but for mbufs. Note the use of the 234 * bus_dmamap_callback2_t interface. 235 */ 236 int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, 237 struct mbuf *mbuf, 238 bus_dmamap_callback2_t *callback, void *callback_arg, 239 int flags); 240 /* 241 * Like bus_dmamap_load but for uios. Note the use of the 242 * bus_dmamap_callback2_t interface. 243 */ 244 int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, 245 struct uio *ui, 246 bus_dmamap_callback2_t *callback, void *callback_arg, 247 int flags); 248 249 /* 250 * Like bus_dmamap_load_mbuf without callback. 251 * Segmentation information are saved in 'segs' and 'nsegs' if 252 * the loading is successful. 'maxsegs' must be set by caller 253 * and must be at least 1 but less than 'dmat' nsegment. It 254 * indicates the number of elements in 'segs'. 'flags' must 255 * have BUS_DMA_NOWAIT turned on. 256 */ 257 int 258 bus_dmamap_load_mbuf_segment(bus_dma_tag_t dmat, bus_dmamap_t map, 259 struct mbuf *mbuf, 260 bus_dma_segment_t *segs, int maxsegs, 261 int *nsegs, int flags); 262 263 /* 264 * Like bus_dmamap_load_mbuf_segment, but it will call m_defrag() 265 * and try reloading if low level code indicates too many fragments 266 * in the '*mbuf'; 'mbuf' will be updated under this situation. 267 */ 268 int 269 bus_dmamap_load_mbuf_defrag(bus_dma_tag_t dmat, bus_dmamap_t map, 270 struct mbuf **mbuf, 271 bus_dma_segment_t *segs, int maxsegs, 272 int *nsegs, int flags); 273 274 /* 275 * Convenient function to create coherent busdma memory 276 */ 277 int 278 bus_dmamem_coherent(bus_dma_tag_t parent, 279 bus_size_t alignment, bus_size_t boundary, 280 bus_addr_t lowaddr, bus_addr_t highaddr, 281 bus_size_t maxsize, int flags, 282 bus_dmamem_t *dmem); 283 284 /* 285 * Simplified version of bus_dmamem_coherent() with: 286 * boundary == 0 287 * lowaddr == BUS_SPACE_MAXADDR 288 * highaddr == BUS_SPACE_MAXADDR 289 * 290 * 'parent' usually should not be NULL, so we could inherit 291 * boundary, lowaddr and highaddr from it. 292 */ 293 void * 294 bus_dmamem_coherent_any(bus_dma_tag_t parent, bus_size_t alignment, 295 bus_size_t maxsize, int flags, 296 bus_dma_tag_t *dtag, bus_dmamap_t *dmap, 297 bus_addr_t *busaddr); 298 299 /* 300 * Perform a syncronization operation on the given map. 301 */ 302 void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t); 303 #define bus_dmamap_sync(dmat, dmamap, op) \ 304 if ((dmamap) != NULL) \ 305 _bus_dmamap_sync(dmat, dmamap, op) 306 307 /* 308 * Release the mapping held by map. 309 */ 310 void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map); 311 #define bus_dmamap_unload(dmat, dmamap) \ 312 if ((dmamap) != NULL) \ 313 _bus_dmamap_unload(dmat, dmamap) 314 315 #endif /* _SYS_BUS_DMA_H_ */ 316