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 /* $FreeBSD$ */ 71 72 #ifndef _BUS_DMA_H_ 73 #define _BUS_DMA_H_ 74 75 #include <sys/_bus_dma.h> 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 #define BUS_DMA_NOCACHE 0x200 104 105 /* 106 * The following flag is a DMA tag hint that the page offset of the 107 * loaded kernel virtual address must be preserved in the first 108 * physical segment address, when the KVA is loaded into DMA. 109 */ 110 #define BUS_DMA_KEEP_PG_OFFSET 0x400 111 112 #define BUS_DMA_LOAD_MBUF 0x800 113 114 /* Forwards needed by prototypes below. */ 115 union ccb; 116 struct bio; 117 struct mbuf; 118 struct memdesc; 119 struct pmap; 120 struct uio; 121 122 /* 123 * Operations performed by bus_dmamap_sync(). 124 */ 125 #define BUS_DMASYNC_PREREAD 1 126 #define BUS_DMASYNC_POSTREAD 2 127 #define BUS_DMASYNC_PREWRITE 4 128 #define BUS_DMASYNC_POSTWRITE 8 129 130 /* 131 * bus_dma_segment_t 132 * 133 * Describes a single contiguous DMA transaction. Values 134 * are suitable for programming into DMA registers. 135 */ 136 typedef struct bus_dma_segment { 137 bus_addr_t ds_addr; /* DMA address */ 138 bus_size_t ds_len; /* length of transfer */ 139 } bus_dma_segment_t; 140 141 /* 142 * A function that returns 1 if the address cannot be accessed by 143 * a device and 0 if it can be. 144 */ 145 typedef int bus_dma_filter_t(void *, bus_addr_t); 146 147 /* 148 * Generic helper function for manipulating mutexes. 149 */ 150 void busdma_lock_mutex(void *arg, bus_dma_lock_op_t op); 151 152 /* 153 * Allocate a device specific dma_tag encapsulating the constraints of 154 * the parent tag in addition to other restrictions specified: 155 * 156 * alignment: Alignment for segments. 157 * boundary: Boundary that segments cannot cross. 158 * lowaddr: Low restricted address that cannot appear in a mapping. 159 * highaddr: High restricted address that cannot appear in a mapping. 160 * filtfunc: An optional function to further test if an address 161 * within the range of lowaddr and highaddr cannot appear 162 * in a mapping. 163 * filtfuncarg: An argument that will be passed to filtfunc in addition 164 * to the address to test. 165 * maxsize: Maximum mapping size supported by this tag. 166 * nsegments: Number of discontinuities allowed in maps. 167 * maxsegsz: Maximum size of a segment in the map. 168 * flags: Bus DMA flags. 169 * lockfunc: An optional function to handle driver-defined lock 170 * operations. 171 * lockfuncarg: An argument that will be passed to lockfunc in addition 172 * to the lock operation. 173 * dmat: A pointer to set to a valid dma tag should the return 174 * value of this function indicate success. 175 */ 176 /* XXX Should probably allow specification of alignment */ 177 int bus_dma_tag_create(bus_dma_tag_t parent, bus_size_t alignment, 178 bus_addr_t boundary, bus_addr_t lowaddr, 179 bus_addr_t highaddr, bus_dma_filter_t *filtfunc, 180 void *filtfuncarg, bus_size_t maxsize, int nsegments, 181 bus_size_t maxsegsz, int flags, bus_dma_lock_t *lockfunc, 182 void *lockfuncarg, bus_dma_tag_t *dmat); 183 184 int bus_dma_tag_destroy(bus_dma_tag_t dmat); 185 186 /* 187 * A function that processes a successfully loaded dma map or an error 188 * from a delayed load map. 189 */ 190 typedef void bus_dmamap_callback_t(void *, bus_dma_segment_t *, int, int); 191 192 /* 193 * Like bus_dmamap_callback but includes map size in bytes. This is 194 * defined as a separate interface to maintain compatibility for users 195 * of bus_dmamap_callback_t--at some point these interfaces should be merged. 196 */ 197 typedef void bus_dmamap_callback2_t(void *, bus_dma_segment_t *, int, bus_size_t, int); 198 199 /* 200 * Map the buffer buf into bus space using the dmamap map. 201 */ 202 int bus_dmamap_load(bus_dma_tag_t dmat, bus_dmamap_t map, void *buf, 203 bus_size_t buflen, bus_dmamap_callback_t *callback, 204 void *callback_arg, int flags); 205 206 /* 207 * Like bus_dmamap_load but for mbufs. Note the use of the 208 * bus_dmamap_callback2_t interface. 209 */ 210 int bus_dmamap_load_mbuf(bus_dma_tag_t dmat, bus_dmamap_t map, 211 struct mbuf *mbuf, 212 bus_dmamap_callback2_t *callback, void *callback_arg, 213 int flags); 214 215 int bus_dmamap_load_mbuf_sg(bus_dma_tag_t dmat, bus_dmamap_t map, 216 struct mbuf *mbuf, bus_dma_segment_t *segs, 217 int *nsegs, int flags); 218 219 /* 220 * Like bus_dmamap_load but for uios. Note the use of the 221 * bus_dmamap_callback2_t interface. 222 */ 223 int bus_dmamap_load_uio(bus_dma_tag_t dmat, bus_dmamap_t map, 224 struct uio *ui, 225 bus_dmamap_callback2_t *callback, void *callback_arg, 226 int flags); 227 228 /* 229 * Like bus_dmamap_load but for cam control blocks. 230 */ 231 int bus_dmamap_load_ccb(bus_dma_tag_t dmat, bus_dmamap_t map, union ccb *ccb, 232 bus_dmamap_callback_t *callback, void *callback_arg, 233 int flags); 234 235 /* 236 * Like bus_dmamap_load but for bios. 237 */ 238 int bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio, 239 bus_dmamap_callback_t *callback, void *callback_arg, 240 int flags); 241 242 /* 243 * Loads any memory descriptor. 244 */ 245 int bus_dmamap_load_mem(bus_dma_tag_t dmat, bus_dmamap_t map, 246 struct memdesc *mem, bus_dmamap_callback_t *callback, 247 void *callback_arg, int flags); 248 249 /* 250 * XXX sparc64 uses the same interface, but a much different implementation. 251 * <machine/bus_dma.h> for the sparc64 arch contains the equivalent 252 * declarations. 253 */ 254 #if !defined(__sparc64__) 255 256 /* 257 * Allocate a handle for mapping from kva/uva/physical 258 * address space into bus device space. 259 */ 260 int bus_dmamap_create(bus_dma_tag_t dmat, int flags, bus_dmamap_t *mapp); 261 262 /* 263 * Destroy a handle for mapping from kva/uva/physical 264 * address space into bus device space. 265 */ 266 int bus_dmamap_destroy(bus_dma_tag_t dmat, bus_dmamap_t map); 267 268 /* 269 * Allocate a piece of memory that can be efficiently mapped into 270 * bus device space based on the constraints listed in the dma tag. 271 * A dmamap to for use with dmamap_load is also allocated. 272 */ 273 int bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags, 274 bus_dmamap_t *mapp); 275 276 /* 277 * Free a piece of memory and its allocated dmamap, that was allocated 278 * via bus_dmamem_alloc. 279 */ 280 void bus_dmamem_free(bus_dma_tag_t dmat, void *vaddr, bus_dmamap_t map); 281 282 /* 283 * Perform a synchronization operation on the given map. 284 */ 285 void _bus_dmamap_sync(bus_dma_tag_t, bus_dmamap_t, bus_dmasync_op_t); 286 #define bus_dmamap_sync(dmat, dmamap, op) \ 287 do { \ 288 if ((dmamap) != NULL) \ 289 _bus_dmamap_sync(dmat, dmamap, op); \ 290 } while (0) 291 292 /* 293 * Release the mapping held by map. 294 */ 295 void _bus_dmamap_unload(bus_dma_tag_t dmat, bus_dmamap_t map); 296 #define bus_dmamap_unload(dmat, dmamap) \ 297 do { \ 298 if ((dmamap) != NULL) \ 299 _bus_dmamap_unload(dmat, dmamap); \ 300 } while (0) 301 302 /* 303 * The following functions define the interface between the MD and MI 304 * busdma layers. These are not intended for consumption by driver 305 * software. 306 */ 307 void __bus_dmamap_waitok(bus_dma_tag_t dmat, bus_dmamap_t map, 308 struct memdesc *mem, 309 bus_dmamap_callback_t *callback, 310 void *callback_arg); 311 312 #define _bus_dmamap_waitok(dmat, map, mem, callback, callback_arg) \ 313 do { \ 314 if ((map) != NULL) \ 315 __bus_dmamap_waitok(dmat, map, mem, callback, \ 316 callback_arg); \ 317 } while (0); 318 319 int _bus_dmamap_load_buffer(bus_dma_tag_t dmat, bus_dmamap_t map, 320 void *buf, bus_size_t buflen, struct pmap *pmap, 321 int flags, bus_dma_segment_t *segs, int *segp); 322 323 int _bus_dmamap_load_phys(bus_dma_tag_t dmat, bus_dmamap_t map, 324 vm_paddr_t paddr, bus_size_t buflen, 325 int flags, bus_dma_segment_t *segs, int *segp); 326 327 bus_dma_segment_t *_bus_dmamap_complete(bus_dma_tag_t dmat, 328 bus_dmamap_t map, 329 bus_dma_segment_t *segs, 330 int nsegs, int error); 331 332 #endif /* __sparc64__ */ 333 334 #endif /* _BUS_DMA_H_ */ 335